1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/kernel.h>
8 #include <linux/buffer_head.h>
9 #include <linux/file.h>
11 #include <linux/pagemap.h>
12 #include <linux/highmem.h>
13 #include <linux/time.h>
14 #include <linux/init.h>
15 #include <linux/string.h>
16 #include <linux/backing-dev.h>
17 #include <linux/writeback.h>
18 #include <linux/compat.h>
19 #include <linux/xattr.h>
20 #include <linux/posix_acl.h>
21 #include <linux/falloc.h>
22 #include <linux/slab.h>
23 #include <linux/ratelimit.h>
24 #include <linux/btrfs.h>
25 #include <linux/blkdev.h>
26 #include <linux/posix_acl_xattr.h>
27 #include <linux/uio.h>
28 #include <linux/magic.h>
29 #include <linux/iversion.h>
30 #include <linux/swap.h>
31 #include <linux/sched/mm.h>
32 #include <asm/unaligned.h>
36 #include "transaction.h"
37 #include "btrfs_inode.h"
38 #include "print-tree.h"
39 #include "ordered-data.h"
43 #include "compression.h"
45 #include "free-space-cache.h"
46 #include "inode-map.h"
50 #include "delalloc-space.h"
51 #include "block-group.h"
53 struct btrfs_iget_args {
54 struct btrfs_key *location;
55 struct btrfs_root *root;
58 struct btrfs_dio_data {
60 u64 unsubmitted_oe_range_start;
61 u64 unsubmitted_oe_range_end;
65 static const struct inode_operations btrfs_dir_inode_operations;
66 static const struct inode_operations btrfs_symlink_inode_operations;
67 static const struct inode_operations btrfs_dir_ro_inode_operations;
68 static const struct inode_operations btrfs_special_inode_operations;
69 static const struct inode_operations btrfs_file_inode_operations;
70 static const struct address_space_operations btrfs_aops;
71 static const struct file_operations btrfs_dir_file_operations;
72 static const struct extent_io_ops btrfs_extent_io_ops;
74 static struct kmem_cache *btrfs_inode_cachep;
75 struct kmem_cache *btrfs_trans_handle_cachep;
76 struct kmem_cache *btrfs_path_cachep;
77 struct kmem_cache *btrfs_free_space_cachep;
78 struct kmem_cache *btrfs_free_space_bitmap_cachep;
80 static int btrfs_setsize(struct inode *inode, struct iattr *attr);
81 static int btrfs_truncate(struct inode *inode, bool skip_writeback);
82 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
83 static noinline int cow_file_range(struct inode *inode,
84 struct page *locked_page,
85 u64 start, u64 end, int *page_started,
86 unsigned long *nr_written, int unlock);
87 static struct extent_map *create_io_em(struct inode *inode, u64 start, u64 len,
88 u64 orig_start, u64 block_start,
89 u64 block_len, u64 orig_block_len,
90 u64 ram_bytes, int compress_type,
93 static void __endio_write_update_ordered(struct inode *inode,
94 const u64 offset, const u64 bytes,
98 * Cleanup all submitted ordered extents in specified range to handle errors
99 * from the btrfs_run_delalloc_range() callback.
101 * NOTE: caller must ensure that when an error happens, it can not call
102 * extent_clear_unlock_delalloc() to clear both the bits EXTENT_DO_ACCOUNTING
103 * and EXTENT_DELALLOC simultaneously, because that causes the reserved metadata
104 * to be released, which we want to happen only when finishing the ordered
105 * extent (btrfs_finish_ordered_io()).
107 static inline void btrfs_cleanup_ordered_extents(struct inode *inode,
108 struct page *locked_page,
109 u64 offset, u64 bytes)
111 unsigned long index = offset >> PAGE_SHIFT;
112 unsigned long end_index = (offset + bytes - 1) >> PAGE_SHIFT;
113 u64 page_start = page_offset(locked_page);
114 u64 page_end = page_start + PAGE_SIZE - 1;
118 while (index <= end_index) {
119 page = find_get_page(inode->i_mapping, index);
123 ClearPagePrivate2(page);
128 * In case this page belongs to the delalloc range being instantiated
129 * then skip it, since the first page of a range is going to be
130 * properly cleaned up by the caller of run_delalloc_range
132 if (page_start >= offset && page_end <= (offset + bytes - 1)) {
137 return __endio_write_update_ordered(inode, offset, bytes, false);
140 static int btrfs_dirty_inode(struct inode *inode);
142 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
143 void btrfs_test_inode_set_ops(struct inode *inode)
145 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
149 static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,
150 struct inode *inode, struct inode *dir,
151 const struct qstr *qstr)
155 err = btrfs_init_acl(trans, inode, dir);
157 err = btrfs_xattr_security_init(trans, inode, dir, qstr);
162 * this does all the hard work for inserting an inline extent into
163 * the btree. The caller should have done a btrfs_drop_extents so that
164 * no overlapping inline items exist in the btree
166 static int insert_inline_extent(struct btrfs_trans_handle *trans,
167 struct btrfs_path *path, int extent_inserted,
168 struct btrfs_root *root, struct inode *inode,
169 u64 start, size_t size, size_t compressed_size,
171 struct page **compressed_pages)
173 struct extent_buffer *leaf;
174 struct page *page = NULL;
177 struct btrfs_file_extent_item *ei;
179 size_t cur_size = size;
180 unsigned long offset;
182 ASSERT((compressed_size > 0 && compressed_pages) ||
183 (compressed_size == 0 && !compressed_pages));
185 if (compressed_size && compressed_pages)
186 cur_size = compressed_size;
188 inode_add_bytes(inode, size);
190 if (!extent_inserted) {
191 struct btrfs_key key;
194 key.objectid = btrfs_ino(BTRFS_I(inode));
196 key.type = BTRFS_EXTENT_DATA_KEY;
198 datasize = btrfs_file_extent_calc_inline_size(cur_size);
199 path->leave_spinning = 1;
200 ret = btrfs_insert_empty_item(trans, root, path, &key,
205 leaf = path->nodes[0];
206 ei = btrfs_item_ptr(leaf, path->slots[0],
207 struct btrfs_file_extent_item);
208 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
209 btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
210 btrfs_set_file_extent_encryption(leaf, ei, 0);
211 btrfs_set_file_extent_other_encoding(leaf, ei, 0);
212 btrfs_set_file_extent_ram_bytes(leaf, ei, size);
213 ptr = btrfs_file_extent_inline_start(ei);
215 if (compress_type != BTRFS_COMPRESS_NONE) {
218 while (compressed_size > 0) {
219 cpage = compressed_pages[i];
220 cur_size = min_t(unsigned long, compressed_size,
223 kaddr = kmap_atomic(cpage);
224 write_extent_buffer(leaf, kaddr, ptr, cur_size);
225 kunmap_atomic(kaddr);
229 compressed_size -= cur_size;
231 btrfs_set_file_extent_compression(leaf, ei,
234 page = find_get_page(inode->i_mapping,
235 start >> PAGE_SHIFT);
236 btrfs_set_file_extent_compression(leaf, ei, 0);
237 kaddr = kmap_atomic(page);
238 offset = offset_in_page(start);
239 write_extent_buffer(leaf, kaddr + offset, ptr, size);
240 kunmap_atomic(kaddr);
243 btrfs_mark_buffer_dirty(leaf);
244 btrfs_release_path(path);
247 * we're an inline extent, so nobody can
248 * extend the file past i_size without locking
249 * a page we already have locked.
251 * We must do any isize and inode updates
252 * before we unlock the pages. Otherwise we
253 * could end up racing with unlink.
255 BTRFS_I(inode)->disk_i_size = inode->i_size;
256 ret = btrfs_update_inode(trans, root, inode);
264 * conditionally insert an inline extent into the file. This
265 * does the checks required to make sure the data is small enough
266 * to fit as an inline extent.
268 static noinline int cow_file_range_inline(struct inode *inode, u64 start,
269 u64 end, size_t compressed_size,
271 struct page **compressed_pages)
273 struct btrfs_root *root = BTRFS_I(inode)->root;
274 struct btrfs_fs_info *fs_info = root->fs_info;
275 struct btrfs_trans_handle *trans;
276 u64 isize = i_size_read(inode);
277 u64 actual_end = min(end + 1, isize);
278 u64 inline_len = actual_end - start;
279 u64 aligned_end = ALIGN(end, fs_info->sectorsize);
280 u64 data_len = inline_len;
282 struct btrfs_path *path;
283 int extent_inserted = 0;
284 u32 extent_item_size;
287 data_len = compressed_size;
290 actual_end > fs_info->sectorsize ||
291 data_len > BTRFS_MAX_INLINE_DATA_SIZE(fs_info) ||
293 (actual_end & (fs_info->sectorsize - 1)) == 0) ||
295 data_len > fs_info->max_inline) {
299 path = btrfs_alloc_path();
303 trans = btrfs_join_transaction(root);
305 btrfs_free_path(path);
306 return PTR_ERR(trans);
308 trans->block_rsv = &BTRFS_I(inode)->block_rsv;
310 if (compressed_size && compressed_pages)
311 extent_item_size = btrfs_file_extent_calc_inline_size(
314 extent_item_size = btrfs_file_extent_calc_inline_size(
317 ret = __btrfs_drop_extents(trans, root, inode, path,
318 start, aligned_end, NULL,
319 1, 1, extent_item_size, &extent_inserted);
321 btrfs_abort_transaction(trans, ret);
325 if (isize > actual_end)
326 inline_len = min_t(u64, isize, actual_end);
327 ret = insert_inline_extent(trans, path, extent_inserted,
329 inline_len, compressed_size,
330 compress_type, compressed_pages);
331 if (ret && ret != -ENOSPC) {
332 btrfs_abort_transaction(trans, ret);
334 } else if (ret == -ENOSPC) {
339 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
340 btrfs_drop_extent_cache(BTRFS_I(inode), start, aligned_end - 1, 0);
343 * Don't forget to free the reserved space, as for inlined extent
344 * it won't count as data extent, free them directly here.
345 * And at reserve time, it's always aligned to page size, so
346 * just free one page here.
348 btrfs_qgroup_free_data(inode, NULL, 0, PAGE_SIZE);
349 btrfs_free_path(path);
350 btrfs_end_transaction(trans);
354 struct async_extent {
359 unsigned long nr_pages;
361 struct list_head list;
366 struct page *locked_page;
369 unsigned int write_flags;
370 struct list_head extents;
371 struct btrfs_work work;
376 /* Number of chunks in flight; must be first in the structure */
378 struct async_chunk chunks[];
381 static noinline int add_async_extent(struct async_chunk *cow,
382 u64 start, u64 ram_size,
385 unsigned long nr_pages,
388 struct async_extent *async_extent;
390 async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS);
391 BUG_ON(!async_extent); /* -ENOMEM */
392 async_extent->start = start;
393 async_extent->ram_size = ram_size;
394 async_extent->compressed_size = compressed_size;
395 async_extent->pages = pages;
396 async_extent->nr_pages = nr_pages;
397 async_extent->compress_type = compress_type;
398 list_add_tail(&async_extent->list, &cow->extents);
403 * Check if the inode has flags compatible with compression
405 static inline bool inode_can_compress(struct inode *inode)
407 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW ||
408 BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
414 * Check if the inode needs to be submitted to compression, based on mount
415 * options, defragmentation, properties or heuristics.
417 static inline int inode_need_compress(struct inode *inode, u64 start, u64 end)
419 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
421 if (!inode_can_compress(inode)) {
422 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
423 KERN_ERR "BTRFS: unexpected compression for ino %llu\n",
424 btrfs_ino(BTRFS_I(inode)));
428 if (btrfs_test_opt(fs_info, FORCE_COMPRESS))
431 if (BTRFS_I(inode)->defrag_compress)
433 /* bad compression ratios */
434 if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
436 if (btrfs_test_opt(fs_info, COMPRESS) ||
437 BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS ||
438 BTRFS_I(inode)->prop_compress)
439 return btrfs_compress_heuristic(inode, start, end);
443 static inline void inode_should_defrag(struct btrfs_inode *inode,
444 u64 start, u64 end, u64 num_bytes, u64 small_write)
446 /* If this is a small write inside eof, kick off a defrag */
447 if (num_bytes < small_write &&
448 (start > 0 || end + 1 < inode->disk_i_size))
449 btrfs_add_inode_defrag(NULL, inode);
453 * we create compressed extents in two phases. The first
454 * phase compresses a range of pages that have already been
455 * locked (both pages and state bits are locked).
457 * This is done inside an ordered work queue, and the compression
458 * is spread across many cpus. The actual IO submission is step
459 * two, and the ordered work queue takes care of making sure that
460 * happens in the same order things were put onto the queue by
461 * writepages and friends.
463 * If this code finds it can't get good compression, it puts an
464 * entry onto the work queue to write the uncompressed bytes. This
465 * makes sure that both compressed inodes and uncompressed inodes
466 * are written in the same order that the flusher thread sent them
469 static noinline int compress_file_range(struct async_chunk *async_chunk)
471 struct inode *inode = async_chunk->inode;
472 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
473 u64 blocksize = fs_info->sectorsize;
474 u64 start = async_chunk->start;
475 u64 end = async_chunk->end;
478 struct page **pages = NULL;
479 unsigned long nr_pages;
480 unsigned long total_compressed = 0;
481 unsigned long total_in = 0;
484 int compress_type = fs_info->compress_type;
485 int compressed_extents = 0;
488 inode_should_defrag(BTRFS_I(inode), start, end, end - start + 1,
491 actual_end = min_t(u64, i_size_read(inode), end + 1);
494 nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1;
495 BUILD_BUG_ON((BTRFS_MAX_COMPRESSED % PAGE_SIZE) != 0);
496 nr_pages = min_t(unsigned long, nr_pages,
497 BTRFS_MAX_COMPRESSED / PAGE_SIZE);
500 * we don't want to send crud past the end of i_size through
501 * compression, that's just a waste of CPU time. So, if the
502 * end of the file is before the start of our current
503 * requested range of bytes, we bail out to the uncompressed
504 * cleanup code that can deal with all of this.
506 * It isn't really the fastest way to fix things, but this is a
507 * very uncommon corner.
509 if (actual_end <= start)
510 goto cleanup_and_bail_uncompressed;
512 total_compressed = actual_end - start;
515 * skip compression for a small file range(<=blocksize) that
516 * isn't an inline extent, since it doesn't save disk space at all.
518 if (total_compressed <= blocksize &&
519 (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
520 goto cleanup_and_bail_uncompressed;
522 total_compressed = min_t(unsigned long, total_compressed,
523 BTRFS_MAX_UNCOMPRESSED);
528 * we do compression for mount -o compress and when the
529 * inode has not been flagged as nocompress. This flag can
530 * change at any time if we discover bad compression ratios.
532 if (inode_need_compress(inode, start, end)) {
534 pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
536 /* just bail out to the uncompressed code */
541 if (BTRFS_I(inode)->defrag_compress)
542 compress_type = BTRFS_I(inode)->defrag_compress;
543 else if (BTRFS_I(inode)->prop_compress)
544 compress_type = BTRFS_I(inode)->prop_compress;
547 * we need to call clear_page_dirty_for_io on each
548 * page in the range. Otherwise applications with the file
549 * mmap'd can wander in and change the page contents while
550 * we are compressing them.
552 * If the compression fails for any reason, we set the pages
553 * dirty again later on.
555 * Note that the remaining part is redirtied, the start pointer
556 * has moved, the end is the original one.
559 extent_range_clear_dirty_for_io(inode, start, end);
563 /* Compression level is applied here and only here */
564 ret = btrfs_compress_pages(
565 compress_type | (fs_info->compress_level << 4),
566 inode->i_mapping, start,
573 unsigned long offset = offset_in_page(total_compressed);
574 struct page *page = pages[nr_pages - 1];
577 /* zero the tail end of the last page, we might be
578 * sending it down to disk
581 kaddr = kmap_atomic(page);
582 memset(kaddr + offset, 0,
584 kunmap_atomic(kaddr);
591 /* lets try to make an inline extent */
592 if (ret || total_in < actual_end) {
593 /* we didn't compress the entire range, try
594 * to make an uncompressed inline extent.
596 ret = cow_file_range_inline(inode, start, end, 0,
597 BTRFS_COMPRESS_NONE, NULL);
599 /* try making a compressed inline extent */
600 ret = cow_file_range_inline(inode, start, end,
602 compress_type, pages);
605 unsigned long clear_flags = EXTENT_DELALLOC |
606 EXTENT_DELALLOC_NEW | EXTENT_DEFRAG |
607 EXTENT_DO_ACCOUNTING;
608 unsigned long page_error_op;
610 page_error_op = ret < 0 ? PAGE_SET_ERROR : 0;
613 * inline extent creation worked or returned error,
614 * we don't need to create any more async work items.
615 * Unlock and free up our temp pages.
617 * We use DO_ACCOUNTING here because we need the
618 * delalloc_release_metadata to be done _after_ we drop
619 * our outstanding extent for clearing delalloc for this
622 extent_clear_unlock_delalloc(inode, start, end, NULL,
630 for (i = 0; i < nr_pages; i++) {
631 WARN_ON(pages[i]->mapping);
642 * we aren't doing an inline extent round the compressed size
643 * up to a block size boundary so the allocator does sane
646 total_compressed = ALIGN(total_compressed, blocksize);
649 * one last check to make sure the compression is really a
650 * win, compare the page count read with the blocks on disk,
651 * compression must free at least one sector size
653 total_in = ALIGN(total_in, PAGE_SIZE);
654 if (total_compressed + blocksize <= total_in) {
655 compressed_extents++;
658 * The async work queues will take care of doing actual
659 * allocation on disk for these compressed pages, and
660 * will submit them to the elevator.
662 add_async_extent(async_chunk, start, total_in,
663 total_compressed, pages, nr_pages,
666 if (start + total_in < end) {
672 return compressed_extents;
677 * the compression code ran but failed to make things smaller,
678 * free any pages it allocated and our page pointer array
680 for (i = 0; i < nr_pages; i++) {
681 WARN_ON(pages[i]->mapping);
686 total_compressed = 0;
689 /* flag the file so we don't compress in the future */
690 if (!btrfs_test_opt(fs_info, FORCE_COMPRESS) &&
691 !(BTRFS_I(inode)->prop_compress)) {
692 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
695 cleanup_and_bail_uncompressed:
697 * No compression, but we still need to write the pages in the file
698 * we've been given so far. redirty the locked page if it corresponds
699 * to our extent and set things up for the async work queue to run
700 * cow_file_range to do the normal delalloc dance.
702 if (page_offset(async_chunk->locked_page) >= start &&
703 page_offset(async_chunk->locked_page) <= end)
704 __set_page_dirty_nobuffers(async_chunk->locked_page);
705 /* unlocked later on in the async handlers */
708 extent_range_redirty_for_io(inode, start, end);
709 add_async_extent(async_chunk, start, end - start + 1, 0, NULL, 0,
710 BTRFS_COMPRESS_NONE);
711 compressed_extents++;
713 return compressed_extents;
716 static void free_async_extent_pages(struct async_extent *async_extent)
720 if (!async_extent->pages)
723 for (i = 0; i < async_extent->nr_pages; i++) {
724 WARN_ON(async_extent->pages[i]->mapping);
725 put_page(async_extent->pages[i]);
727 kfree(async_extent->pages);
728 async_extent->nr_pages = 0;
729 async_extent->pages = NULL;
733 * phase two of compressed writeback. This is the ordered portion
734 * of the code, which only gets called in the order the work was
735 * queued. We walk all the async extents created by compress_file_range
736 * and send them down to the disk.
738 static noinline void submit_compressed_extents(struct async_chunk *async_chunk)
740 struct inode *inode = async_chunk->inode;
741 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
742 struct async_extent *async_extent;
744 struct btrfs_key ins;
745 struct extent_map *em;
746 struct btrfs_root *root = BTRFS_I(inode)->root;
747 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
751 while (!list_empty(&async_chunk->extents)) {
752 async_extent = list_entry(async_chunk->extents.next,
753 struct async_extent, list);
754 list_del(&async_extent->list);
757 lock_extent(io_tree, async_extent->start,
758 async_extent->start + async_extent->ram_size - 1);
759 /* did the compression code fall back to uncompressed IO? */
760 if (!async_extent->pages) {
761 int page_started = 0;
762 unsigned long nr_written = 0;
764 /* allocate blocks */
765 ret = cow_file_range(inode, async_chunk->locked_page,
767 async_extent->start +
768 async_extent->ram_size - 1,
769 &page_started, &nr_written, 0);
774 * if page_started, cow_file_range inserted an
775 * inline extent and took care of all the unlocking
776 * and IO for us. Otherwise, we need to submit
777 * all those pages down to the drive.
779 if (!page_started && !ret)
780 extent_write_locked_range(inode,
782 async_extent->start +
783 async_extent->ram_size - 1,
786 unlock_page(async_chunk->locked_page);
792 ret = btrfs_reserve_extent(root, async_extent->ram_size,
793 async_extent->compressed_size,
794 async_extent->compressed_size,
795 0, alloc_hint, &ins, 1, 1);
797 free_async_extent_pages(async_extent);
799 if (ret == -ENOSPC) {
800 unlock_extent(io_tree, async_extent->start,
801 async_extent->start +
802 async_extent->ram_size - 1);
805 * we need to redirty the pages if we decide to
806 * fallback to uncompressed IO, otherwise we
807 * will not submit these pages down to lower
810 extent_range_redirty_for_io(inode,
812 async_extent->start +
813 async_extent->ram_size - 1);
820 * here we're doing allocation and writeback of the
823 em = create_io_em(inode, async_extent->start,
824 async_extent->ram_size, /* len */
825 async_extent->start, /* orig_start */
826 ins.objectid, /* block_start */
827 ins.offset, /* block_len */
828 ins.offset, /* orig_block_len */
829 async_extent->ram_size, /* ram_bytes */
830 async_extent->compress_type,
831 BTRFS_ORDERED_COMPRESSED);
833 /* ret value is not necessary due to void function */
834 goto out_free_reserve;
837 ret = btrfs_add_ordered_extent_compress(inode,
840 async_extent->ram_size,
842 BTRFS_ORDERED_COMPRESSED,
843 async_extent->compress_type);
845 btrfs_drop_extent_cache(BTRFS_I(inode),
847 async_extent->start +
848 async_extent->ram_size - 1, 0);
849 goto out_free_reserve;
851 btrfs_dec_block_group_reservations(fs_info, ins.objectid);
854 * clear dirty, set writeback and unlock the pages.
856 extent_clear_unlock_delalloc(inode, async_extent->start,
857 async_extent->start +
858 async_extent->ram_size - 1,
859 NULL, EXTENT_LOCKED | EXTENT_DELALLOC,
860 PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
862 if (btrfs_submit_compressed_write(inode,
864 async_extent->ram_size,
866 ins.offset, async_extent->pages,
867 async_extent->nr_pages,
868 async_chunk->write_flags)) {
869 struct page *p = async_extent->pages[0];
870 const u64 start = async_extent->start;
871 const u64 end = start + async_extent->ram_size - 1;
873 p->mapping = inode->i_mapping;
874 btrfs_writepage_endio_finish_ordered(p, start, end, 0);
877 extent_clear_unlock_delalloc(inode, start, end,
881 free_async_extent_pages(async_extent);
883 alloc_hint = ins.objectid + ins.offset;
889 btrfs_dec_block_group_reservations(fs_info, ins.objectid);
890 btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 1);
892 extent_clear_unlock_delalloc(inode, async_extent->start,
893 async_extent->start +
894 async_extent->ram_size - 1,
895 NULL, EXTENT_LOCKED | EXTENT_DELALLOC |
896 EXTENT_DELALLOC_NEW |
897 EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING,
898 PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
899 PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
901 free_async_extent_pages(async_extent);
906 static u64 get_extent_allocation_hint(struct inode *inode, u64 start,
909 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
910 struct extent_map *em;
913 read_lock(&em_tree->lock);
914 em = search_extent_mapping(em_tree, start, num_bytes);
917 * if block start isn't an actual block number then find the
918 * first block in this inode and use that as a hint. If that
919 * block is also bogus then just don't worry about it.
921 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
923 em = search_extent_mapping(em_tree, 0, 0);
924 if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
925 alloc_hint = em->block_start;
929 alloc_hint = em->block_start;
933 read_unlock(&em_tree->lock);
939 * when extent_io.c finds a delayed allocation range in the file,
940 * the call backs end up in this code. The basic idea is to
941 * allocate extents on disk for the range, and create ordered data structs
942 * in ram to track those extents.
944 * locked_page is the page that writepage had locked already. We use
945 * it to make sure we don't do extra locks or unlocks.
947 * *page_started is set to one if we unlock locked_page and do everything
948 * required to start IO on it. It may be clean and already done with
951 static noinline int cow_file_range(struct inode *inode,
952 struct page *locked_page,
953 u64 start, u64 end, int *page_started,
954 unsigned long *nr_written, int unlock)
956 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
957 struct btrfs_root *root = BTRFS_I(inode)->root;
960 unsigned long ram_size;
961 u64 cur_alloc_size = 0;
962 u64 blocksize = fs_info->sectorsize;
963 struct btrfs_key ins;
964 struct extent_map *em;
966 unsigned long page_ops;
967 bool extent_reserved = false;
970 if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
976 num_bytes = ALIGN(end - start + 1, blocksize);
977 num_bytes = max(blocksize, num_bytes);
978 ASSERT(num_bytes <= btrfs_super_total_bytes(fs_info->super_copy));
980 inode_should_defrag(BTRFS_I(inode), start, end, num_bytes, SZ_64K);
983 /* lets try to make an inline extent */
984 ret = cow_file_range_inline(inode, start, end, 0,
985 BTRFS_COMPRESS_NONE, NULL);
988 * We use DO_ACCOUNTING here because we need the
989 * delalloc_release_metadata to be run _after_ we drop
990 * our outstanding extent for clearing delalloc for this
993 extent_clear_unlock_delalloc(inode, start, end, NULL,
994 EXTENT_LOCKED | EXTENT_DELALLOC |
995 EXTENT_DELALLOC_NEW | EXTENT_DEFRAG |
996 EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
997 PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK |
999 *nr_written = *nr_written +
1000 (end - start + PAGE_SIZE) / PAGE_SIZE;
1003 } else if (ret < 0) {
1008 alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
1009 btrfs_drop_extent_cache(BTRFS_I(inode), start,
1010 start + num_bytes - 1, 0);
1012 while (num_bytes > 0) {
1013 cur_alloc_size = num_bytes;
1014 ret = btrfs_reserve_extent(root, cur_alloc_size, cur_alloc_size,
1015 fs_info->sectorsize, 0, alloc_hint,
1019 cur_alloc_size = ins.offset;
1020 extent_reserved = true;
1022 ram_size = ins.offset;
1023 em = create_io_em(inode, start, ins.offset, /* len */
1024 start, /* orig_start */
1025 ins.objectid, /* block_start */
1026 ins.offset, /* block_len */
1027 ins.offset, /* orig_block_len */
1028 ram_size, /* ram_bytes */
1029 BTRFS_COMPRESS_NONE, /* compress_type */
1030 BTRFS_ORDERED_REGULAR /* type */);
1035 free_extent_map(em);
1037 ret = btrfs_add_ordered_extent(inode, start, ins.objectid,
1038 ram_size, cur_alloc_size, 0);
1040 goto out_drop_extent_cache;
1042 if (root->root_key.objectid ==
1043 BTRFS_DATA_RELOC_TREE_OBJECTID) {
1044 ret = btrfs_reloc_clone_csums(inode, start,
1047 * Only drop cache here, and process as normal.
1049 * We must not allow extent_clear_unlock_delalloc()
1050 * at out_unlock label to free meta of this ordered
1051 * extent, as its meta should be freed by
1052 * btrfs_finish_ordered_io().
1054 * So we must continue until @start is increased to
1055 * skip current ordered extent.
1058 btrfs_drop_extent_cache(BTRFS_I(inode), start,
1059 start + ram_size - 1, 0);
1062 btrfs_dec_block_group_reservations(fs_info, ins.objectid);
1064 /* we're not doing compressed IO, don't unlock the first
1065 * page (which the caller expects to stay locked), don't
1066 * clear any dirty bits and don't set any writeback bits
1068 * Do set the Private2 bit so we know this page was properly
1069 * setup for writepage
1071 page_ops = unlock ? PAGE_UNLOCK : 0;
1072 page_ops |= PAGE_SET_PRIVATE2;
1074 extent_clear_unlock_delalloc(inode, start,
1075 start + ram_size - 1,
1077 EXTENT_LOCKED | EXTENT_DELALLOC,
1079 if (num_bytes < cur_alloc_size)
1082 num_bytes -= cur_alloc_size;
1083 alloc_hint = ins.objectid + ins.offset;
1084 start += cur_alloc_size;
1085 extent_reserved = false;
1088 * btrfs_reloc_clone_csums() error, since start is increased
1089 * extent_clear_unlock_delalloc() at out_unlock label won't
1090 * free metadata of current ordered extent, we're OK to exit.
1098 out_drop_extent_cache:
1099 btrfs_drop_extent_cache(BTRFS_I(inode), start, start + ram_size - 1, 0);
1101 btrfs_dec_block_group_reservations(fs_info, ins.objectid);
1102 btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 1);
1104 clear_bits = EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DELALLOC_NEW |
1105 EXTENT_DEFRAG | EXTENT_CLEAR_META_RESV;
1106 page_ops = PAGE_UNLOCK | PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK |
1109 * If we reserved an extent for our delalloc range (or a subrange) and
1110 * failed to create the respective ordered extent, then it means that
1111 * when we reserved the extent we decremented the extent's size from
1112 * the data space_info's bytes_may_use counter and incremented the
1113 * space_info's bytes_reserved counter by the same amount. We must make
1114 * sure extent_clear_unlock_delalloc() does not try to decrement again
1115 * the data space_info's bytes_may_use counter, therefore we do not pass
1116 * it the flag EXTENT_CLEAR_DATA_RESV.
1118 if (extent_reserved) {
1119 extent_clear_unlock_delalloc(inode, start,
1120 start + cur_alloc_size,
1124 start += cur_alloc_size;
1128 extent_clear_unlock_delalloc(inode, start, end, locked_page,
1129 clear_bits | EXTENT_CLEAR_DATA_RESV,
1135 * work queue call back to started compression on a file and pages
1137 static noinline void async_cow_start(struct btrfs_work *work)
1139 struct async_chunk *async_chunk;
1140 int compressed_extents;
1142 async_chunk = container_of(work, struct async_chunk, work);
1144 compressed_extents = compress_file_range(async_chunk);
1145 if (compressed_extents == 0) {
1146 btrfs_add_delayed_iput(async_chunk->inode);
1147 async_chunk->inode = NULL;
1152 * work queue call back to submit previously compressed pages
1154 static noinline void async_cow_submit(struct btrfs_work *work)
1156 struct async_chunk *async_chunk = container_of(work, struct async_chunk,
1158 struct btrfs_fs_info *fs_info = btrfs_work_owner(work);
1159 unsigned long nr_pages;
1161 nr_pages = (async_chunk->end - async_chunk->start + PAGE_SIZE) >>
1164 /* atomic_sub_return implies a barrier */
1165 if (atomic_sub_return(nr_pages, &fs_info->async_delalloc_pages) <
1167 cond_wake_up_nomb(&fs_info->async_submit_wait);
1170 * ->inode could be NULL if async_chunk_start has failed to compress,
1171 * in which case we don't have anything to submit, yet we need to
1172 * always adjust ->async_delalloc_pages as its paired with the init
1173 * happening in cow_file_range_async
1175 if (async_chunk->inode)
1176 submit_compressed_extents(async_chunk);
1179 static noinline void async_cow_free(struct btrfs_work *work)
1181 struct async_chunk *async_chunk;
1183 async_chunk = container_of(work, struct async_chunk, work);
1184 if (async_chunk->inode)
1185 btrfs_add_delayed_iput(async_chunk->inode);
1187 * Since the pointer to 'pending' is at the beginning of the array of
1188 * async_chunk's, freeing it ensures the whole array has been freed.
1190 if (atomic_dec_and_test(async_chunk->pending))
1191 kvfree(async_chunk->pending);
1194 static int cow_file_range_async(struct inode *inode, struct page *locked_page,
1195 u64 start, u64 end, int *page_started,
1196 unsigned long *nr_written,
1197 unsigned int write_flags)
1199 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1200 struct async_cow *ctx;
1201 struct async_chunk *async_chunk;
1202 unsigned long nr_pages;
1204 u64 num_chunks = DIV_ROUND_UP(end - start, SZ_512K);
1206 bool should_compress;
1209 unlock_extent(&BTRFS_I(inode)->io_tree, start, end);
1211 if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS &&
1212 !btrfs_test_opt(fs_info, FORCE_COMPRESS)) {
1214 should_compress = false;
1216 should_compress = true;
1219 nofs_flag = memalloc_nofs_save();
1220 ctx = kvmalloc(struct_size(ctx, chunks, num_chunks), GFP_KERNEL);
1221 memalloc_nofs_restore(nofs_flag);
1224 unsigned clear_bits = EXTENT_LOCKED | EXTENT_DELALLOC |
1225 EXTENT_DELALLOC_NEW | EXTENT_DEFRAG |
1226 EXTENT_DO_ACCOUNTING;
1227 unsigned long page_ops = PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
1228 PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
1231 extent_clear_unlock_delalloc(inode, start, end, locked_page,
1232 clear_bits, page_ops);
1236 async_chunk = ctx->chunks;
1237 atomic_set(&ctx->num_chunks, num_chunks);
1239 for (i = 0; i < num_chunks; i++) {
1240 if (should_compress)
1241 cur_end = min(end, start + SZ_512K - 1);
1246 * igrab is called higher up in the call chain, take only the
1247 * lightweight reference for the callback lifetime
1250 async_chunk[i].pending = &ctx->num_chunks;
1251 async_chunk[i].inode = inode;
1252 async_chunk[i].start = start;
1253 async_chunk[i].end = cur_end;
1254 async_chunk[i].locked_page = locked_page;
1255 async_chunk[i].write_flags = write_flags;
1256 INIT_LIST_HEAD(&async_chunk[i].extents);
1258 btrfs_init_work(&async_chunk[i].work,
1259 btrfs_delalloc_helper,
1260 async_cow_start, async_cow_submit,
1263 nr_pages = DIV_ROUND_UP(cur_end - start, PAGE_SIZE);
1264 atomic_add(nr_pages, &fs_info->async_delalloc_pages);
1266 btrfs_queue_work(fs_info->delalloc_workers, &async_chunk[i].work);
1268 *nr_written += nr_pages;
1269 start = cur_end + 1;
1275 static noinline int csum_exist_in_range(struct btrfs_fs_info *fs_info,
1276 u64 bytenr, u64 num_bytes)
1279 struct btrfs_ordered_sum *sums;
1282 ret = btrfs_lookup_csums_range(fs_info->csum_root, bytenr,
1283 bytenr + num_bytes - 1, &list, 0);
1284 if (ret == 0 && list_empty(&list))
1287 while (!list_empty(&list)) {
1288 sums = list_entry(list.next, struct btrfs_ordered_sum, list);
1289 list_del(&sums->list);
1298 * when nowcow writeback call back. This checks for snapshots or COW copies
1299 * of the extents that exist in the file, and COWs the file as required.
1301 * If no cow copies or snapshots exist, we write directly to the existing
1304 static noinline int run_delalloc_nocow(struct inode *inode,
1305 struct page *locked_page,
1306 const u64 start, const u64 end,
1307 int *page_started, int force,
1308 unsigned long *nr_written)
1310 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1311 struct btrfs_root *root = BTRFS_I(inode)->root;
1312 struct btrfs_path *path;
1313 u64 cow_start = (u64)-1;
1314 u64 cur_offset = start;
1316 bool check_prev = true;
1317 const bool freespace_inode = btrfs_is_free_space_inode(BTRFS_I(inode));
1318 u64 ino = btrfs_ino(BTRFS_I(inode));
1320 u64 disk_bytenr = 0;
1322 path = btrfs_alloc_path();
1324 extent_clear_unlock_delalloc(inode, start, end, locked_page,
1325 EXTENT_LOCKED | EXTENT_DELALLOC |
1326 EXTENT_DO_ACCOUNTING |
1327 EXTENT_DEFRAG, PAGE_UNLOCK |
1329 PAGE_SET_WRITEBACK |
1330 PAGE_END_WRITEBACK);
1335 struct btrfs_key found_key;
1336 struct btrfs_file_extent_item *fi;
1337 struct extent_buffer *leaf;
1347 ret = btrfs_lookup_file_extent(NULL, root, path, ino,
1353 * If there is no extent for our range when doing the initial
1354 * search, then go back to the previous slot as it will be the
1355 * one containing the search offset
1357 if (ret > 0 && path->slots[0] > 0 && check_prev) {
1358 leaf = path->nodes[0];
1359 btrfs_item_key_to_cpu(leaf, &found_key,
1360 path->slots[0] - 1);
1361 if (found_key.objectid == ino &&
1362 found_key.type == BTRFS_EXTENT_DATA_KEY)
1367 /* Go to next leaf if we have exhausted the current one */
1368 leaf = path->nodes[0];
1369 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
1370 ret = btrfs_next_leaf(root, path);
1372 if (cow_start != (u64)-1)
1373 cur_offset = cow_start;
1378 leaf = path->nodes[0];
1381 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
1383 /* Didn't find anything for our INO */
1384 if (found_key.objectid > ino)
1387 * Keep searching until we find an EXTENT_ITEM or there are no
1388 * more extents for this inode
1390 if (WARN_ON_ONCE(found_key.objectid < ino) ||
1391 found_key.type < BTRFS_EXTENT_DATA_KEY) {
1396 /* Found key is not EXTENT_DATA_KEY or starts after req range */
1397 if (found_key.type > BTRFS_EXTENT_DATA_KEY ||
1398 found_key.offset > end)
1402 * If the found extent starts after requested offset, then
1403 * adjust extent_end to be right before this extent begins
1405 if (found_key.offset > cur_offset) {
1406 extent_end = found_key.offset;
1412 * Found extent which begins before our range and potentially
1415 fi = btrfs_item_ptr(leaf, path->slots[0],
1416 struct btrfs_file_extent_item);
1417 extent_type = btrfs_file_extent_type(leaf, fi);
1419 ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
1420 if (extent_type == BTRFS_FILE_EXTENT_REG ||
1421 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1422 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
1423 extent_offset = btrfs_file_extent_offset(leaf, fi);
1424 extent_end = found_key.offset +
1425 btrfs_file_extent_num_bytes(leaf, fi);
1427 btrfs_file_extent_disk_num_bytes(leaf, fi);
1429 * If extent we got ends before our range starts, skip
1432 if (extent_end <= start) {
1437 if (disk_bytenr == 0)
1439 /* Skip compressed/encrypted/encoded extents */
1440 if (btrfs_file_extent_compression(leaf, fi) ||
1441 btrfs_file_extent_encryption(leaf, fi) ||
1442 btrfs_file_extent_other_encoding(leaf, fi))
1445 * If extent is created before the last volume's snapshot
1446 * this implies the extent is shared, hence we can't do
1447 * nocow. This is the same check as in
1448 * btrfs_cross_ref_exist but without calling
1449 * btrfs_search_slot.
1451 if (!freespace_inode &&
1452 btrfs_file_extent_generation(leaf, fi) <=
1453 btrfs_root_last_snapshot(&root->root_item))
1455 if (extent_type == BTRFS_FILE_EXTENT_REG && !force)
1457 /* If extent is RO, we must COW it */
1458 if (btrfs_extent_readonly(fs_info, disk_bytenr))
1460 ret = btrfs_cross_ref_exist(root, ino,
1462 extent_offset, disk_bytenr);
1465 * ret could be -EIO if the above fails to read
1469 if (cow_start != (u64)-1)
1470 cur_offset = cow_start;
1474 WARN_ON_ONCE(freespace_inode);
1477 disk_bytenr += extent_offset;
1478 disk_bytenr += cur_offset - found_key.offset;
1479 num_bytes = min(end + 1, extent_end) - cur_offset;
1481 * If there are pending snapshots for this root, we
1482 * fall into common COW way
1484 if (!freespace_inode && atomic_read(&root->snapshot_force_cow))
1487 * force cow if csum exists in the range.
1488 * this ensure that csum for a given extent are
1489 * either valid or do not exist.
1491 ret = csum_exist_in_range(fs_info, disk_bytenr,
1495 * ret could be -EIO if the above fails to read
1499 if (cow_start != (u64)-1)
1500 cur_offset = cow_start;
1503 WARN_ON_ONCE(freespace_inode);
1506 if (!btrfs_inc_nocow_writers(fs_info, disk_bytenr))
1509 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1510 extent_end = found_key.offset + ram_bytes;
1511 extent_end = ALIGN(extent_end, fs_info->sectorsize);
1512 /* Skip extents outside of our requested range */
1513 if (extent_end <= start) {
1518 /* If this triggers then we have a memory corruption */
1523 * If nocow is false then record the beginning of the range
1524 * that needs to be COWed
1527 if (cow_start == (u64)-1)
1528 cow_start = cur_offset;
1529 cur_offset = extent_end;
1530 if (cur_offset > end)
1536 btrfs_release_path(path);
1539 * COW range from cow_start to found_key.offset - 1. As the key
1540 * will contain the beginning of the first extent that can be
1541 * NOCOW, following one which needs to be COW'ed
1543 if (cow_start != (u64)-1) {
1544 ret = cow_file_range(inode, locked_page,
1545 cow_start, found_key.offset - 1,
1546 page_started, nr_written, 1);
1549 btrfs_dec_nocow_writers(fs_info,
1553 cow_start = (u64)-1;
1556 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
1557 u64 orig_start = found_key.offset - extent_offset;
1558 struct extent_map *em;
1560 em = create_io_em(inode, cur_offset, num_bytes,
1562 disk_bytenr, /* block_start */
1563 num_bytes, /* block_len */
1564 disk_num_bytes, /* orig_block_len */
1565 ram_bytes, BTRFS_COMPRESS_NONE,
1566 BTRFS_ORDERED_PREALLOC);
1569 btrfs_dec_nocow_writers(fs_info,
1574 free_extent_map(em);
1575 ret = btrfs_add_ordered_extent(inode, cur_offset,
1576 disk_bytenr, num_bytes,
1578 BTRFS_ORDERED_PREALLOC);
1580 btrfs_drop_extent_cache(BTRFS_I(inode),
1582 cur_offset + num_bytes - 1,
1587 ret = btrfs_add_ordered_extent(inode, cur_offset,
1588 disk_bytenr, num_bytes,
1590 BTRFS_ORDERED_NOCOW);
1596 btrfs_dec_nocow_writers(fs_info, disk_bytenr);
1599 if (root->root_key.objectid ==
1600 BTRFS_DATA_RELOC_TREE_OBJECTID)
1602 * Error handled later, as we must prevent
1603 * extent_clear_unlock_delalloc() in error handler
1604 * from freeing metadata of created ordered extent.
1606 ret = btrfs_reloc_clone_csums(inode, cur_offset,
1609 extent_clear_unlock_delalloc(inode, cur_offset,
1610 cur_offset + num_bytes - 1,
1611 locked_page, EXTENT_LOCKED |
1613 EXTENT_CLEAR_DATA_RESV,
1614 PAGE_UNLOCK | PAGE_SET_PRIVATE2);
1616 cur_offset = extent_end;
1619 * btrfs_reloc_clone_csums() error, now we're OK to call error
1620 * handler, as metadata for created ordered extent will only
1621 * be freed by btrfs_finish_ordered_io().
1625 if (cur_offset > end)
1628 btrfs_release_path(path);
1630 if (cur_offset <= end && cow_start == (u64)-1)
1631 cow_start = cur_offset;
1633 if (cow_start != (u64)-1) {
1635 ret = cow_file_range(inode, locked_page, cow_start, end,
1636 page_started, nr_written, 1);
1643 btrfs_dec_nocow_writers(fs_info, disk_bytenr);
1645 if (ret && cur_offset < end)
1646 extent_clear_unlock_delalloc(inode, cur_offset, end,
1647 locked_page, EXTENT_LOCKED |
1648 EXTENT_DELALLOC | EXTENT_DEFRAG |
1649 EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
1651 PAGE_SET_WRITEBACK |
1652 PAGE_END_WRITEBACK);
1653 btrfs_free_path(path);
1657 static inline int need_force_cow(struct inode *inode, u64 start, u64 end)
1660 if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
1661 !(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC))
1665 * @defrag_bytes is a hint value, no spinlock held here,
1666 * if is not zero, it means the file is defragging.
1667 * Force cow if given extent needs to be defragged.
1669 if (BTRFS_I(inode)->defrag_bytes &&
1670 test_range_bit(&BTRFS_I(inode)->io_tree, start, end,
1671 EXTENT_DEFRAG, 0, NULL))
1678 * Function to process delayed allocation (create CoW) for ranges which are
1679 * being touched for the first time.
1681 int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
1682 u64 start, u64 end, int *page_started, unsigned long *nr_written,
1683 struct writeback_control *wbc)
1686 int force_cow = need_force_cow(inode, start, end);
1687 unsigned int write_flags = wbc_to_write_flags(wbc);
1689 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) {
1690 ret = run_delalloc_nocow(inode, locked_page, start, end,
1691 page_started, 1, nr_written);
1692 } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
1693 ret = run_delalloc_nocow(inode, locked_page, start, end,
1694 page_started, 0, nr_written);
1695 } else if (!inode_can_compress(inode) ||
1696 !inode_need_compress(inode, start, end)) {
1697 ret = cow_file_range(inode, locked_page, start, end,
1698 page_started, nr_written, 1);
1700 set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1701 &BTRFS_I(inode)->runtime_flags);
1702 ret = cow_file_range_async(inode, locked_page, start, end,
1703 page_started, nr_written,
1707 btrfs_cleanup_ordered_extents(inode, locked_page, start,
1712 void btrfs_split_delalloc_extent(struct inode *inode,
1713 struct extent_state *orig, u64 split)
1717 /* not delalloc, ignore it */
1718 if (!(orig->state & EXTENT_DELALLOC))
1721 size = orig->end - orig->start + 1;
1722 if (size > BTRFS_MAX_EXTENT_SIZE) {
1727 * See the explanation in btrfs_merge_delalloc_extent, the same
1728 * applies here, just in reverse.
1730 new_size = orig->end - split + 1;
1731 num_extents = count_max_extents(new_size);
1732 new_size = split - orig->start;
1733 num_extents += count_max_extents(new_size);
1734 if (count_max_extents(size) >= num_extents)
1738 spin_lock(&BTRFS_I(inode)->lock);
1739 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
1740 spin_unlock(&BTRFS_I(inode)->lock);
1744 * Handle merged delayed allocation extents so we can keep track of new extents
1745 * that are just merged onto old extents, such as when we are doing sequential
1746 * writes, so we can properly account for the metadata space we'll need.
1748 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
1749 struct extent_state *other)
1751 u64 new_size, old_size;
1754 /* not delalloc, ignore it */
1755 if (!(other->state & EXTENT_DELALLOC))
1758 if (new->start > other->start)
1759 new_size = new->end - other->start + 1;
1761 new_size = other->end - new->start + 1;
1763 /* we're not bigger than the max, unreserve the space and go */
1764 if (new_size <= BTRFS_MAX_EXTENT_SIZE) {
1765 spin_lock(&BTRFS_I(inode)->lock);
1766 btrfs_mod_outstanding_extents(BTRFS_I(inode), -1);
1767 spin_unlock(&BTRFS_I(inode)->lock);
1772 * We have to add up either side to figure out how many extents were
1773 * accounted for before we merged into one big extent. If the number of
1774 * extents we accounted for is <= the amount we need for the new range
1775 * then we can return, otherwise drop. Think of it like this
1779 * So we've grown the extent by a MAX_SIZE extent, this would mean we
1780 * need 2 outstanding extents, on one side we have 1 and the other side
1781 * we have 1 so they are == and we can return. But in this case
1783 * [MAX_SIZE+4k][MAX_SIZE+4k]
1785 * Each range on their own accounts for 2 extents, but merged together
1786 * they are only 3 extents worth of accounting, so we need to drop in
1789 old_size = other->end - other->start + 1;
1790 num_extents = count_max_extents(old_size);
1791 old_size = new->end - new->start + 1;
1792 num_extents += count_max_extents(old_size);
1793 if (count_max_extents(new_size) >= num_extents)
1796 spin_lock(&BTRFS_I(inode)->lock);
1797 btrfs_mod_outstanding_extents(BTRFS_I(inode), -1);
1798 spin_unlock(&BTRFS_I(inode)->lock);
1801 static void btrfs_add_delalloc_inodes(struct btrfs_root *root,
1802 struct inode *inode)
1804 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1806 spin_lock(&root->delalloc_lock);
1807 if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
1808 list_add_tail(&BTRFS_I(inode)->delalloc_inodes,
1809 &root->delalloc_inodes);
1810 set_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1811 &BTRFS_I(inode)->runtime_flags);
1812 root->nr_delalloc_inodes++;
1813 if (root->nr_delalloc_inodes == 1) {
1814 spin_lock(&fs_info->delalloc_root_lock);
1815 BUG_ON(!list_empty(&root->delalloc_root));
1816 list_add_tail(&root->delalloc_root,
1817 &fs_info->delalloc_roots);
1818 spin_unlock(&fs_info->delalloc_root_lock);
1821 spin_unlock(&root->delalloc_lock);
1825 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
1826 struct btrfs_inode *inode)
1828 struct btrfs_fs_info *fs_info = root->fs_info;
1830 if (!list_empty(&inode->delalloc_inodes)) {
1831 list_del_init(&inode->delalloc_inodes);
1832 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1833 &inode->runtime_flags);
1834 root->nr_delalloc_inodes--;
1835 if (!root->nr_delalloc_inodes) {
1836 ASSERT(list_empty(&root->delalloc_inodes));
1837 spin_lock(&fs_info->delalloc_root_lock);
1838 BUG_ON(list_empty(&root->delalloc_root));
1839 list_del_init(&root->delalloc_root);
1840 spin_unlock(&fs_info->delalloc_root_lock);
1845 static void btrfs_del_delalloc_inode(struct btrfs_root *root,
1846 struct btrfs_inode *inode)
1848 spin_lock(&root->delalloc_lock);
1849 __btrfs_del_delalloc_inode(root, inode);
1850 spin_unlock(&root->delalloc_lock);
1854 * Properly track delayed allocation bytes in the inode and to maintain the
1855 * list of inodes that have pending delalloc work to be done.
1857 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
1860 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1862 if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC))
1865 * set_bit and clear bit hooks normally require _irqsave/restore
1866 * but in this case, we are only testing for the DELALLOC
1867 * bit, which is only set or cleared with irqs on
1869 if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
1870 struct btrfs_root *root = BTRFS_I(inode)->root;
1871 u64 len = state->end + 1 - state->start;
1872 u32 num_extents = count_max_extents(len);
1873 bool do_list = !btrfs_is_free_space_inode(BTRFS_I(inode));
1875 spin_lock(&BTRFS_I(inode)->lock);
1876 btrfs_mod_outstanding_extents(BTRFS_I(inode), num_extents);
1877 spin_unlock(&BTRFS_I(inode)->lock);
1879 /* For sanity tests */
1880 if (btrfs_is_testing(fs_info))
1883 percpu_counter_add_batch(&fs_info->delalloc_bytes, len,
1884 fs_info->delalloc_batch);
1885 spin_lock(&BTRFS_I(inode)->lock);
1886 BTRFS_I(inode)->delalloc_bytes += len;
1887 if (*bits & EXTENT_DEFRAG)
1888 BTRFS_I(inode)->defrag_bytes += len;
1889 if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1890 &BTRFS_I(inode)->runtime_flags))
1891 btrfs_add_delalloc_inodes(root, inode);
1892 spin_unlock(&BTRFS_I(inode)->lock);
1895 if (!(state->state & EXTENT_DELALLOC_NEW) &&
1896 (*bits & EXTENT_DELALLOC_NEW)) {
1897 spin_lock(&BTRFS_I(inode)->lock);
1898 BTRFS_I(inode)->new_delalloc_bytes += state->end + 1 -
1900 spin_unlock(&BTRFS_I(inode)->lock);
1905 * Once a range is no longer delalloc this function ensures that proper
1906 * accounting happens.
1908 void btrfs_clear_delalloc_extent(struct inode *vfs_inode,
1909 struct extent_state *state, unsigned *bits)
1911 struct btrfs_inode *inode = BTRFS_I(vfs_inode);
1912 struct btrfs_fs_info *fs_info = btrfs_sb(vfs_inode->i_sb);
1913 u64 len = state->end + 1 - state->start;
1914 u32 num_extents = count_max_extents(len);
1916 if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) {
1917 spin_lock(&inode->lock);
1918 inode->defrag_bytes -= len;
1919 spin_unlock(&inode->lock);
1923 * set_bit and clear bit hooks normally require _irqsave/restore
1924 * but in this case, we are only testing for the DELALLOC
1925 * bit, which is only set or cleared with irqs on
1927 if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
1928 struct btrfs_root *root = inode->root;
1929 bool do_list = !btrfs_is_free_space_inode(inode);
1931 spin_lock(&inode->lock);
1932 btrfs_mod_outstanding_extents(inode, -num_extents);
1933 spin_unlock(&inode->lock);
1936 * We don't reserve metadata space for space cache inodes so we
1937 * don't need to call delalloc_release_metadata if there is an
1940 if (*bits & EXTENT_CLEAR_META_RESV &&
1941 root != fs_info->tree_root)
1942 btrfs_delalloc_release_metadata(inode, len, false);
1944 /* For sanity tests. */
1945 if (btrfs_is_testing(fs_info))
1948 if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID &&
1949 do_list && !(state->state & EXTENT_NORESERVE) &&
1950 (*bits & EXTENT_CLEAR_DATA_RESV))
1951 btrfs_free_reserved_data_space_noquota(
1955 percpu_counter_add_batch(&fs_info->delalloc_bytes, -len,
1956 fs_info->delalloc_batch);
1957 spin_lock(&inode->lock);
1958 inode->delalloc_bytes -= len;
1959 if (do_list && inode->delalloc_bytes == 0 &&
1960 test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
1961 &inode->runtime_flags))
1962 btrfs_del_delalloc_inode(root, inode);
1963 spin_unlock(&inode->lock);
1966 if ((state->state & EXTENT_DELALLOC_NEW) &&
1967 (*bits & EXTENT_DELALLOC_NEW)) {
1968 spin_lock(&inode->lock);
1969 ASSERT(inode->new_delalloc_bytes >= len);
1970 inode->new_delalloc_bytes -= len;
1971 spin_unlock(&inode->lock);
1976 * btrfs_bio_fits_in_stripe - Checks whether the size of the given bio will fit
1977 * in a chunk's stripe. This function ensures that bios do not span a
1980 * @page - The page we are about to add to the bio
1981 * @size - size we want to add to the bio
1982 * @bio - bio we want to ensure is smaller than a stripe
1983 * @bio_flags - flags of the bio
1985 * return 1 if page cannot be added to the bio
1986 * return 0 if page can be added to the bio
1987 * return error otherwise
1989 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
1990 unsigned long bio_flags)
1992 struct inode *inode = page->mapping->host;
1993 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1994 u64 logical = (u64)bio->bi_iter.bi_sector << 9;
1998 struct btrfs_io_geometry geom;
2000 if (bio_flags & EXTENT_BIO_COMPRESSED)
2003 length = bio->bi_iter.bi_size;
2004 map_length = length;
2005 ret = btrfs_get_io_geometry(fs_info, btrfs_op(bio), logical, map_length,
2010 if (geom.len < length + size)
2016 * in order to insert checksums into the metadata in large chunks,
2017 * we wait until bio submission time. All the pages in the bio are
2018 * checksummed and sums are attached onto the ordered extent record.
2020 * At IO completion time the cums attached on the ordered extent record
2021 * are inserted into the btree
2023 static blk_status_t btrfs_submit_bio_start(void *private_data, struct bio *bio,
2026 struct inode *inode = private_data;
2027 blk_status_t ret = 0;
2029 ret = btrfs_csum_one_bio(inode, bio, 0, 0);
2030 BUG_ON(ret); /* -ENOMEM */
2035 * extent_io.c submission hook. This does the right thing for csum calculation
2036 * on write, or reading the csums from the tree before a read.
2038 * Rules about async/sync submit,
2039 * a) read: sync submit
2041 * b) write without checksum: sync submit
2043 * c) write with checksum:
2044 * c-1) if bio is issued by fsync: sync submit
2045 * (sync_writers != 0)
2047 * c-2) if root is reloc root: sync submit
2048 * (only in case of buffered IO)
2050 * c-3) otherwise: async submit
2052 static blk_status_t btrfs_submit_bio_hook(struct inode *inode, struct bio *bio,
2054 unsigned long bio_flags)
2057 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2058 struct btrfs_root *root = BTRFS_I(inode)->root;
2059 enum btrfs_wq_endio_type metadata = BTRFS_WQ_ENDIO_DATA;
2060 blk_status_t ret = 0;
2062 int async = !atomic_read(&BTRFS_I(inode)->sync_writers);
2064 skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
2066 if (btrfs_is_free_space_inode(BTRFS_I(inode)))
2067 metadata = BTRFS_WQ_ENDIO_FREE_SPACE;
2069 if (bio_op(bio) != REQ_OP_WRITE) {
2070 ret = btrfs_bio_wq_end_io(fs_info, bio, metadata);
2074 if (bio_flags & EXTENT_BIO_COMPRESSED) {
2075 ret = btrfs_submit_compressed_read(inode, bio,
2079 } else if (!skip_sum) {
2080 ret = btrfs_lookup_bio_sums(inode, bio, NULL);
2085 } else if (async && !skip_sum) {
2086 /* csum items have already been cloned */
2087 if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
2089 /* we're doing a write, do the async checksumming */
2090 ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, bio_flags,
2091 0, inode, btrfs_submit_bio_start);
2093 } else if (!skip_sum) {
2094 ret = btrfs_csum_one_bio(inode, bio, 0, 0);
2100 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
2104 bio->bi_status = ret;
2111 * given a list of ordered sums record them in the inode. This happens
2112 * at IO completion time based on sums calculated at bio submission time.
2114 static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
2115 struct inode *inode, struct list_head *list)
2117 struct btrfs_ordered_sum *sum;
2120 list_for_each_entry(sum, list, list) {
2121 trans->adding_csums = true;
2122 ret = btrfs_csum_file_blocks(trans,
2123 BTRFS_I(inode)->root->fs_info->csum_root, sum);
2124 trans->adding_csums = false;
2131 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
2132 unsigned int extra_bits,
2133 struct extent_state **cached_state)
2135 WARN_ON(PAGE_ALIGNED(end));
2136 return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end,
2137 extra_bits, cached_state);
2140 /* see btrfs_writepage_start_hook for details on why this is required */
2141 struct btrfs_writepage_fixup {
2143 struct btrfs_work work;
2146 static void btrfs_writepage_fixup_worker(struct btrfs_work *work)
2148 struct btrfs_writepage_fixup *fixup;
2149 struct btrfs_ordered_extent *ordered;
2150 struct extent_state *cached_state = NULL;
2151 struct extent_changeset *data_reserved = NULL;
2153 struct inode *inode;
2158 fixup = container_of(work, struct btrfs_writepage_fixup, work);
2162 if (!page->mapping || !PageDirty(page) || !PageChecked(page)) {
2163 ClearPageChecked(page);
2167 inode = page->mapping->host;
2168 page_start = page_offset(page);
2169 page_end = page_offset(page) + PAGE_SIZE - 1;
2171 lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
2174 /* already ordered? We're done */
2175 if (PagePrivate2(page))
2178 ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), page_start,
2181 unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start,
2182 page_end, &cached_state);
2184 btrfs_start_ordered_extent(inode, ordered, 1);
2185 btrfs_put_ordered_extent(ordered);
2189 ret = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
2192 mapping_set_error(page->mapping, ret);
2193 end_extent_writepage(page, ret, page_start, page_end);
2194 ClearPageChecked(page);
2198 ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0,
2201 mapping_set_error(page->mapping, ret);
2202 end_extent_writepage(page, ret, page_start, page_end);
2203 ClearPageChecked(page);
2207 ClearPageChecked(page);
2208 set_page_dirty(page);
2209 btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
2211 unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end,
2217 extent_changeset_free(data_reserved);
2221 * There are a few paths in the higher layers of the kernel that directly
2222 * set the page dirty bit without asking the filesystem if it is a
2223 * good idea. This causes problems because we want to make sure COW
2224 * properly happens and the data=ordered rules are followed.
2226 * In our case any range that doesn't have the ORDERED bit set
2227 * hasn't been properly setup for IO. We kick off an async process
2228 * to fix it up. The async helper will wait for ordered extents, set
2229 * the delalloc bit and make it safe to write the page.
2231 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end)
2233 struct inode *inode = page->mapping->host;
2234 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2235 struct btrfs_writepage_fixup *fixup;
2237 /* this page is properly in the ordered list */
2238 if (TestClearPagePrivate2(page))
2241 if (PageChecked(page))
2244 fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
2248 SetPageChecked(page);
2250 btrfs_init_work(&fixup->work, btrfs_fixup_helper,
2251 btrfs_writepage_fixup_worker, NULL, NULL);
2253 btrfs_queue_work(fs_info->fixup_workers, &fixup->work);
2257 static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
2258 struct inode *inode, u64 file_pos,
2259 u64 disk_bytenr, u64 disk_num_bytes,
2260 u64 num_bytes, u64 ram_bytes,
2261 u8 compression, u8 encryption,
2262 u16 other_encoding, int extent_type)
2264 struct btrfs_root *root = BTRFS_I(inode)->root;
2265 struct btrfs_file_extent_item *fi;
2266 struct btrfs_path *path;
2267 struct extent_buffer *leaf;
2268 struct btrfs_key ins;
2270 int extent_inserted = 0;
2273 path = btrfs_alloc_path();
2278 * we may be replacing one extent in the tree with another.
2279 * The new extent is pinned in the extent map, and we don't want
2280 * to drop it from the cache until it is completely in the btree.
2282 * So, tell btrfs_drop_extents to leave this extent in the cache.
2283 * the caller is expected to unpin it and allow it to be merged
2286 ret = __btrfs_drop_extents(trans, root, inode, path, file_pos,
2287 file_pos + num_bytes, NULL, 0,
2288 1, sizeof(*fi), &extent_inserted);
2292 if (!extent_inserted) {
2293 ins.objectid = btrfs_ino(BTRFS_I(inode));
2294 ins.offset = file_pos;
2295 ins.type = BTRFS_EXTENT_DATA_KEY;
2297 path->leave_spinning = 1;
2298 ret = btrfs_insert_empty_item(trans, root, path, &ins,
2303 leaf = path->nodes[0];
2304 fi = btrfs_item_ptr(leaf, path->slots[0],
2305 struct btrfs_file_extent_item);
2306 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
2307 btrfs_set_file_extent_type(leaf, fi, extent_type);
2308 btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
2309 btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes);
2310 btrfs_set_file_extent_offset(leaf, fi, 0);
2311 btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
2312 btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
2313 btrfs_set_file_extent_compression(leaf, fi, compression);
2314 btrfs_set_file_extent_encryption(leaf, fi, encryption);
2315 btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding);
2317 btrfs_mark_buffer_dirty(leaf);
2318 btrfs_release_path(path);
2320 inode_add_bytes(inode, num_bytes);
2322 ins.objectid = disk_bytenr;
2323 ins.offset = disk_num_bytes;
2324 ins.type = BTRFS_EXTENT_ITEM_KEY;
2327 * Release the reserved range from inode dirty range map, as it is
2328 * already moved into delayed_ref_head
2330 ret = btrfs_qgroup_release_data(inode, file_pos, ram_bytes);
2334 ret = btrfs_alloc_reserved_file_extent(trans, root,
2335 btrfs_ino(BTRFS_I(inode)),
2336 file_pos, qg_released, &ins);
2338 btrfs_free_path(path);
2343 /* snapshot-aware defrag */
2344 struct sa_defrag_extent_backref {
2345 struct rb_node node;
2346 struct old_sa_defrag_extent *old;
2355 struct old_sa_defrag_extent {
2356 struct list_head list;
2357 struct new_sa_defrag_extent *new;
2366 struct new_sa_defrag_extent {
2367 struct rb_root root;
2368 struct list_head head;
2369 struct btrfs_path *path;
2370 struct inode *inode;
2378 static int backref_comp(struct sa_defrag_extent_backref *b1,
2379 struct sa_defrag_extent_backref *b2)
2381 if (b1->root_id < b2->root_id)
2383 else if (b1->root_id > b2->root_id)
2386 if (b1->inum < b2->inum)
2388 else if (b1->inum > b2->inum)
2391 if (b1->file_pos < b2->file_pos)
2393 else if (b1->file_pos > b2->file_pos)
2397 * [------------------------------] ===> (a range of space)
2398 * |<--->| |<---->| =============> (fs/file tree A)
2399 * |<---------------------------->| ===> (fs/file tree B)
2401 * A range of space can refer to two file extents in one tree while
2402 * refer to only one file extent in another tree.
2404 * So we may process a disk offset more than one time(two extents in A)
2405 * and locate at the same extent(one extent in B), then insert two same
2406 * backrefs(both refer to the extent in B).
2411 static void backref_insert(struct rb_root *root,
2412 struct sa_defrag_extent_backref *backref)
2414 struct rb_node **p = &root->rb_node;
2415 struct rb_node *parent = NULL;
2416 struct sa_defrag_extent_backref *entry;
2421 entry = rb_entry(parent, struct sa_defrag_extent_backref, node);
2423 ret = backref_comp(backref, entry);
2427 p = &(*p)->rb_right;
2430 rb_link_node(&backref->node, parent, p);
2431 rb_insert_color(&backref->node, root);
2435 * Note the backref might has changed, and in this case we just return 0.
2437 static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id,
2440 struct btrfs_file_extent_item *extent;
2441 struct old_sa_defrag_extent *old = ctx;
2442 struct new_sa_defrag_extent *new = old->new;
2443 struct btrfs_path *path = new->path;
2444 struct btrfs_key key;
2445 struct btrfs_root *root;
2446 struct sa_defrag_extent_backref *backref;
2447 struct extent_buffer *leaf;
2448 struct inode *inode = new->inode;
2449 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2455 if (BTRFS_I(inode)->root->root_key.objectid == root_id &&
2456 inum == btrfs_ino(BTRFS_I(inode)))
2459 key.objectid = root_id;
2460 key.type = BTRFS_ROOT_ITEM_KEY;
2461 key.offset = (u64)-1;
2463 root = btrfs_read_fs_root_no_name(fs_info, &key);
2465 if (PTR_ERR(root) == -ENOENT)
2468 btrfs_debug(fs_info, "inum=%llu, offset=%llu, root_id=%llu",
2469 inum, offset, root_id);
2470 return PTR_ERR(root);
2473 key.objectid = inum;
2474 key.type = BTRFS_EXTENT_DATA_KEY;
2475 if (offset > (u64)-1 << 32)
2478 key.offset = offset;
2480 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2481 if (WARN_ON(ret < 0))
2488 leaf = path->nodes[0];
2489 slot = path->slots[0];
2491 if (slot >= btrfs_header_nritems(leaf)) {
2492 ret = btrfs_next_leaf(root, path);
2495 } else if (ret > 0) {
2504 btrfs_item_key_to_cpu(leaf, &key, slot);
2506 if (key.objectid > inum)
2509 if (key.objectid < inum || key.type != BTRFS_EXTENT_DATA_KEY)
2512 extent = btrfs_item_ptr(leaf, slot,
2513 struct btrfs_file_extent_item);
2515 if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr)
2519 * 'offset' refers to the exact key.offset,
2520 * NOT the 'offset' field in btrfs_extent_data_ref, ie.
2521 * (key.offset - extent_offset).
2523 if (key.offset != offset)
2526 extent_offset = btrfs_file_extent_offset(leaf, extent);
2527 num_bytes = btrfs_file_extent_num_bytes(leaf, extent);
2529 if (extent_offset >= old->extent_offset + old->offset +
2530 old->len || extent_offset + num_bytes <=
2531 old->extent_offset + old->offset)
2536 backref = kmalloc(sizeof(*backref), GFP_NOFS);
2542 backref->root_id = root_id;
2543 backref->inum = inum;
2544 backref->file_pos = offset;
2545 backref->num_bytes = num_bytes;
2546 backref->extent_offset = extent_offset;
2547 backref->generation = btrfs_file_extent_generation(leaf, extent);
2549 backref_insert(&new->root, backref);
2552 btrfs_release_path(path);
2557 static noinline bool record_extent_backrefs(struct btrfs_path *path,
2558 struct new_sa_defrag_extent *new)
2560 struct btrfs_fs_info *fs_info = btrfs_sb(new->inode->i_sb);
2561 struct old_sa_defrag_extent *old, *tmp;
2566 list_for_each_entry_safe(old, tmp, &new->head, list) {
2567 ret = iterate_inodes_from_logical(old->bytenr +
2568 old->extent_offset, fs_info,
2569 path, record_one_backref,
2571 if (ret < 0 && ret != -ENOENT)
2574 /* no backref to be processed for this extent */
2576 list_del(&old->list);
2581 if (list_empty(&new->head))
2587 static int relink_is_mergable(struct extent_buffer *leaf,
2588 struct btrfs_file_extent_item *fi,
2589 struct new_sa_defrag_extent *new)
2591 if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr)
2594 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2597 if (btrfs_file_extent_compression(leaf, fi) != new->compress_type)
2600 if (btrfs_file_extent_encryption(leaf, fi) ||
2601 btrfs_file_extent_other_encoding(leaf, fi))
2608 * Note the backref might has changed, and in this case we just return 0.
2610 static noinline int relink_extent_backref(struct btrfs_path *path,
2611 struct sa_defrag_extent_backref *prev,
2612 struct sa_defrag_extent_backref *backref)
2614 struct btrfs_file_extent_item *extent;
2615 struct btrfs_file_extent_item *item;
2616 struct btrfs_ordered_extent *ordered;
2617 struct btrfs_trans_handle *trans;
2618 struct btrfs_ref ref = { 0 };
2619 struct btrfs_root *root;
2620 struct btrfs_key key;
2621 struct extent_buffer *leaf;
2622 struct old_sa_defrag_extent *old = backref->old;
2623 struct new_sa_defrag_extent *new = old->new;
2624 struct btrfs_fs_info *fs_info = btrfs_sb(new->inode->i_sb);
2625 struct inode *inode;
2626 struct extent_state *cached = NULL;
2635 if (prev && prev->root_id == backref->root_id &&
2636 prev->inum == backref->inum &&
2637 prev->file_pos + prev->num_bytes == backref->file_pos)
2640 /* step 1: get root */
2641 key.objectid = backref->root_id;
2642 key.type = BTRFS_ROOT_ITEM_KEY;
2643 key.offset = (u64)-1;
2645 index = srcu_read_lock(&fs_info->subvol_srcu);
2647 root = btrfs_read_fs_root_no_name(fs_info, &key);
2649 srcu_read_unlock(&fs_info->subvol_srcu, index);
2650 if (PTR_ERR(root) == -ENOENT)
2652 return PTR_ERR(root);
2655 if (btrfs_root_readonly(root)) {
2656 srcu_read_unlock(&fs_info->subvol_srcu, index);
2660 /* step 2: get inode */
2661 key.objectid = backref->inum;
2662 key.type = BTRFS_INODE_ITEM_KEY;
2665 inode = btrfs_iget(fs_info->sb, &key, root, NULL);
2666 if (IS_ERR(inode)) {
2667 srcu_read_unlock(&fs_info->subvol_srcu, index);
2671 srcu_read_unlock(&fs_info->subvol_srcu, index);
2673 /* step 3: relink backref */
2674 lock_start = backref->file_pos;
2675 lock_end = backref->file_pos + backref->num_bytes - 1;
2676 lock_extent_bits(&BTRFS_I(inode)->io_tree, lock_start, lock_end,
2679 ordered = btrfs_lookup_first_ordered_extent(inode, lock_end);
2681 btrfs_put_ordered_extent(ordered);
2685 trans = btrfs_join_transaction(root);
2686 if (IS_ERR(trans)) {
2687 ret = PTR_ERR(trans);
2691 key.objectid = backref->inum;
2692 key.type = BTRFS_EXTENT_DATA_KEY;
2693 key.offset = backref->file_pos;
2695 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2698 } else if (ret > 0) {
2703 extent = btrfs_item_ptr(path->nodes[0], path->slots[0],
2704 struct btrfs_file_extent_item);
2706 if (btrfs_file_extent_generation(path->nodes[0], extent) !=
2707 backref->generation)
2710 btrfs_release_path(path);
2712 start = backref->file_pos;
2713 if (backref->extent_offset < old->extent_offset + old->offset)
2714 start += old->extent_offset + old->offset -
2715 backref->extent_offset;
2717 len = min(backref->extent_offset + backref->num_bytes,
2718 old->extent_offset + old->offset + old->len);
2719 len -= max(backref->extent_offset, old->extent_offset + old->offset);
2721 ret = btrfs_drop_extents(trans, root, inode, start,
2726 key.objectid = btrfs_ino(BTRFS_I(inode));
2727 key.type = BTRFS_EXTENT_DATA_KEY;
2730 path->leave_spinning = 1;
2732 struct btrfs_file_extent_item *fi;
2734 struct btrfs_key found_key;
2736 ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
2741 leaf = path->nodes[0];
2742 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2744 fi = btrfs_item_ptr(leaf, path->slots[0],
2745 struct btrfs_file_extent_item);
2746 extent_len = btrfs_file_extent_num_bytes(leaf, fi);
2748 if (extent_len + found_key.offset == start &&
2749 relink_is_mergable(leaf, fi, new)) {
2750 btrfs_set_file_extent_num_bytes(leaf, fi,
2752 btrfs_mark_buffer_dirty(leaf);
2753 inode_add_bytes(inode, len);
2759 btrfs_release_path(path);
2764 ret = btrfs_insert_empty_item(trans, root, path, &key,
2767 btrfs_abort_transaction(trans, ret);
2771 leaf = path->nodes[0];
2772 item = btrfs_item_ptr(leaf, path->slots[0],
2773 struct btrfs_file_extent_item);
2774 btrfs_set_file_extent_disk_bytenr(leaf, item, new->bytenr);
2775 btrfs_set_file_extent_disk_num_bytes(leaf, item, new->disk_len);
2776 btrfs_set_file_extent_offset(leaf, item, start - new->file_pos);
2777 btrfs_set_file_extent_num_bytes(leaf, item, len);
2778 btrfs_set_file_extent_ram_bytes(leaf, item, new->len);
2779 btrfs_set_file_extent_generation(leaf, item, trans->transid);
2780 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
2781 btrfs_set_file_extent_compression(leaf, item, new->compress_type);
2782 btrfs_set_file_extent_encryption(leaf, item, 0);
2783 btrfs_set_file_extent_other_encoding(leaf, item, 0);
2785 btrfs_mark_buffer_dirty(leaf);
2786 inode_add_bytes(inode, len);
2787 btrfs_release_path(path);
2789 btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new->bytenr,
2791 btrfs_init_data_ref(&ref, backref->root_id, backref->inum,
2792 new->file_pos); /* start - extent_offset */
2793 ret = btrfs_inc_extent_ref(trans, &ref);
2795 btrfs_abort_transaction(trans, ret);
2801 btrfs_release_path(path);
2802 path->leave_spinning = 0;
2803 btrfs_end_transaction(trans);
2805 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end,
2811 static void free_sa_defrag_extent(struct new_sa_defrag_extent *new)
2813 struct old_sa_defrag_extent *old, *tmp;
2818 list_for_each_entry_safe(old, tmp, &new->head, list) {
2824 static void relink_file_extents(struct new_sa_defrag_extent *new)
2826 struct btrfs_fs_info *fs_info = btrfs_sb(new->inode->i_sb);
2827 struct btrfs_path *path;
2828 struct sa_defrag_extent_backref *backref;
2829 struct sa_defrag_extent_backref *prev = NULL;
2830 struct rb_node *node;
2833 path = btrfs_alloc_path();
2837 if (!record_extent_backrefs(path, new)) {
2838 btrfs_free_path(path);
2841 btrfs_release_path(path);
2844 node = rb_first(&new->root);
2847 rb_erase(node, &new->root);
2849 backref = rb_entry(node, struct sa_defrag_extent_backref, node);
2851 ret = relink_extent_backref(path, prev, backref);
2864 btrfs_free_path(path);
2866 free_sa_defrag_extent(new);
2868 atomic_dec(&fs_info->defrag_running);
2869 wake_up(&fs_info->transaction_wait);
2872 static struct new_sa_defrag_extent *
2873 record_old_file_extents(struct inode *inode,
2874 struct btrfs_ordered_extent *ordered)
2876 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2877 struct btrfs_root *root = BTRFS_I(inode)->root;
2878 struct btrfs_path *path;
2879 struct btrfs_key key;
2880 struct old_sa_defrag_extent *old;
2881 struct new_sa_defrag_extent *new;
2884 new = kmalloc(sizeof(*new), GFP_NOFS);
2889 new->file_pos = ordered->file_offset;
2890 new->len = ordered->len;
2891 new->bytenr = ordered->start;
2892 new->disk_len = ordered->disk_len;
2893 new->compress_type = ordered->compress_type;
2894 new->root = RB_ROOT;
2895 INIT_LIST_HEAD(&new->head);
2897 path = btrfs_alloc_path();
2901 key.objectid = btrfs_ino(BTRFS_I(inode));
2902 key.type = BTRFS_EXTENT_DATA_KEY;
2903 key.offset = new->file_pos;
2905 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2908 if (ret > 0 && path->slots[0] > 0)
2911 /* find out all the old extents for the file range */
2913 struct btrfs_file_extent_item *extent;
2914 struct extent_buffer *l;
2923 slot = path->slots[0];
2925 if (slot >= btrfs_header_nritems(l)) {
2926 ret = btrfs_next_leaf(root, path);
2934 btrfs_item_key_to_cpu(l, &key, slot);
2936 if (key.objectid != btrfs_ino(BTRFS_I(inode)))
2938 if (key.type != BTRFS_EXTENT_DATA_KEY)
2940 if (key.offset >= new->file_pos + new->len)
2943 extent = btrfs_item_ptr(l, slot, struct btrfs_file_extent_item);
2945 num_bytes = btrfs_file_extent_num_bytes(l, extent);
2946 if (key.offset + num_bytes < new->file_pos)
2949 disk_bytenr = btrfs_file_extent_disk_bytenr(l, extent);
2953 extent_offset = btrfs_file_extent_offset(l, extent);
2955 old = kmalloc(sizeof(*old), GFP_NOFS);
2959 offset = max(new->file_pos, key.offset);
2960 end = min(new->file_pos + new->len, key.offset + num_bytes);
2962 old->bytenr = disk_bytenr;
2963 old->extent_offset = extent_offset;
2964 old->offset = offset - key.offset;
2965 old->len = end - offset;
2968 list_add_tail(&old->list, &new->head);
2974 btrfs_free_path(path);
2975 atomic_inc(&fs_info->defrag_running);
2980 btrfs_free_path(path);
2982 free_sa_defrag_extent(new);
2986 static void btrfs_release_delalloc_bytes(struct btrfs_fs_info *fs_info,
2989 struct btrfs_block_group_cache *cache;
2991 cache = btrfs_lookup_block_group(fs_info, start);
2994 spin_lock(&cache->lock);
2995 cache->delalloc_bytes -= len;
2996 spin_unlock(&cache->lock);
2998 btrfs_put_block_group(cache);
3001 /* as ordered data IO finishes, this gets called so we can finish
3002 * an ordered extent if the range of bytes in the file it covers are
3005 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
3007 struct inode *inode = ordered_extent->inode;
3008 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3009 struct btrfs_root *root = BTRFS_I(inode)->root;
3010 struct btrfs_trans_handle *trans = NULL;
3011 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
3012 struct extent_state *cached_state = NULL;
3013 struct new_sa_defrag_extent *new = NULL;
3014 int compress_type = 0;
3016 u64 logical_len = ordered_extent->len;
3018 bool truncated = false;
3019 bool range_locked = false;
3020 bool clear_new_delalloc_bytes = false;
3021 bool clear_reserved_extent = true;
3023 if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) &&
3024 !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags) &&
3025 !test_bit(BTRFS_ORDERED_DIRECT, &ordered_extent->flags))
3026 clear_new_delalloc_bytes = true;
3028 nolock = btrfs_is_free_space_inode(BTRFS_I(inode));
3030 if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) {
3035 btrfs_free_io_failure_record(BTRFS_I(inode),
3036 ordered_extent->file_offset,
3037 ordered_extent->file_offset +
3038 ordered_extent->len - 1);
3040 if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) {
3042 logical_len = ordered_extent->truncated_len;
3043 /* Truncated the entire extent, don't bother adding */
3048 if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
3049 BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */
3052 * For mwrite(mmap + memset to write) case, we still reserve
3053 * space for NOCOW range.
3054 * As NOCOW won't cause a new delayed ref, just free the space
3056 btrfs_qgroup_free_data(inode, NULL, ordered_extent->file_offset,
3057 ordered_extent->len);
3058 btrfs_ordered_update_i_size(inode, 0, ordered_extent);
3060 trans = btrfs_join_transaction_nolock(root);
3062 trans = btrfs_join_transaction(root);
3063 if (IS_ERR(trans)) {
3064 ret = PTR_ERR(trans);
3068 trans->block_rsv = &BTRFS_I(inode)->block_rsv;
3069 ret = btrfs_update_inode_fallback(trans, root, inode);
3070 if (ret) /* -ENOMEM or corruption */
3071 btrfs_abort_transaction(trans, ret);
3075 range_locked = true;
3076 lock_extent_bits(io_tree, ordered_extent->file_offset,
3077 ordered_extent->file_offset + ordered_extent->len - 1,
3080 ret = test_range_bit(io_tree, ordered_extent->file_offset,
3081 ordered_extent->file_offset + ordered_extent->len - 1,
3082 EXTENT_DEFRAG, 0, cached_state);
3084 u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item);
3085 if (0 && last_snapshot >= BTRFS_I(inode)->generation)
3086 /* the inode is shared */
3087 new = record_old_file_extents(inode, ordered_extent);
3089 clear_extent_bit(io_tree, ordered_extent->file_offset,
3090 ordered_extent->file_offset + ordered_extent->len - 1,
3091 EXTENT_DEFRAG, 0, 0, &cached_state);
3095 trans = btrfs_join_transaction_nolock(root);
3097 trans = btrfs_join_transaction(root);
3098 if (IS_ERR(trans)) {
3099 ret = PTR_ERR(trans);
3104 trans->block_rsv = &BTRFS_I(inode)->block_rsv;
3106 if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))
3107 compress_type = ordered_extent->compress_type;
3108 if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
3109 BUG_ON(compress_type);
3110 btrfs_qgroup_free_data(inode, NULL, ordered_extent->file_offset,
3111 ordered_extent->len);
3112 ret = btrfs_mark_extent_written(trans, BTRFS_I(inode),
3113 ordered_extent->file_offset,
3114 ordered_extent->file_offset +
3117 BUG_ON(root == fs_info->tree_root);
3118 ret = insert_reserved_file_extent(trans, inode,
3119 ordered_extent->file_offset,
3120 ordered_extent->start,
3121 ordered_extent->disk_len,
3122 logical_len, logical_len,
3123 compress_type, 0, 0,
3124 BTRFS_FILE_EXTENT_REG);
3126 clear_reserved_extent = false;
3127 btrfs_release_delalloc_bytes(fs_info,
3128 ordered_extent->start,
3129 ordered_extent->disk_len);
3132 unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
3133 ordered_extent->file_offset, ordered_extent->len,
3136 btrfs_abort_transaction(trans, ret);
3140 ret = add_pending_csums(trans, inode, &ordered_extent->list);
3142 btrfs_abort_transaction(trans, ret);
3146 btrfs_ordered_update_i_size(inode, 0, ordered_extent);
3147 ret = btrfs_update_inode_fallback(trans, root, inode);
3148 if (ret) { /* -ENOMEM or corruption */
3149 btrfs_abort_transaction(trans, ret);
3154 if (range_locked || clear_new_delalloc_bytes) {
3155 unsigned int clear_bits = 0;
3158 clear_bits |= EXTENT_LOCKED;
3159 if (clear_new_delalloc_bytes)
3160 clear_bits |= EXTENT_DELALLOC_NEW;
3161 clear_extent_bit(&BTRFS_I(inode)->io_tree,
3162 ordered_extent->file_offset,
3163 ordered_extent->file_offset +
3164 ordered_extent->len - 1,
3166 (clear_bits & EXTENT_LOCKED) ? 1 : 0,
3171 btrfs_end_transaction(trans);
3173 if (ret || truncated) {
3177 start = ordered_extent->file_offset + logical_len;
3179 start = ordered_extent->file_offset;
3180 end = ordered_extent->file_offset + ordered_extent->len - 1;
3181 clear_extent_uptodate(io_tree, start, end, NULL);
3183 /* Drop the cache for the part of the extent we didn't write. */
3184 btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0);
3187 * If the ordered extent had an IOERR or something else went
3188 * wrong we need to return the space for this ordered extent
3189 * back to the allocator. We only free the extent in the
3190 * truncated case if we didn't write out the extent at all.
3192 * If we made it past insert_reserved_file_extent before we
3193 * errored out then we don't need to do this as the accounting
3194 * has already been done.
3196 if ((ret || !logical_len) &&
3197 clear_reserved_extent &&
3198 !test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) &&
3199 !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags))
3200 btrfs_free_reserved_extent(fs_info,
3201 ordered_extent->start,
3202 ordered_extent->disk_len, 1);
3207 * This needs to be done to make sure anybody waiting knows we are done
3208 * updating everything for this ordered extent.
3210 btrfs_remove_ordered_extent(inode, ordered_extent);
3212 /* for snapshot-aware defrag */
3215 free_sa_defrag_extent(new);
3216 atomic_dec(&fs_info->defrag_running);
3218 relink_file_extents(new);
3223 btrfs_put_ordered_extent(ordered_extent);
3224 /* once for the tree */
3225 btrfs_put_ordered_extent(ordered_extent);
3230 static void finish_ordered_fn(struct btrfs_work *work)
3232 struct btrfs_ordered_extent *ordered_extent;
3233 ordered_extent = container_of(work, struct btrfs_ordered_extent, work);
3234 btrfs_finish_ordered_io(ordered_extent);
3237 void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
3238 u64 end, int uptodate)
3240 struct inode *inode = page->mapping->host;
3241 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3242 struct btrfs_ordered_extent *ordered_extent = NULL;
3243 struct btrfs_workqueue *wq;
3244 btrfs_work_func_t func;
3246 trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
3248 ClearPagePrivate2(page);
3249 if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start,
3250 end - start + 1, uptodate))
3253 if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
3254 wq = fs_info->endio_freespace_worker;
3255 func = btrfs_freespace_write_helper;
3257 wq = fs_info->endio_write_workers;
3258 func = btrfs_endio_write_helper;
3261 btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL,
3263 btrfs_queue_work(wq, &ordered_extent->work);
3266 static int __readpage_endio_check(struct inode *inode,
3267 struct btrfs_io_bio *io_bio,
3268 int icsum, struct page *page,
3269 int pgoff, u64 start, size_t len)
3271 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3272 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
3274 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
3276 u8 csum[BTRFS_CSUM_SIZE];
3278 csum_expected = ((u8 *)io_bio->csum) + icsum * csum_size;
3280 kaddr = kmap_atomic(page);
3281 shash->tfm = fs_info->csum_shash;
3283 crypto_shash_init(shash);
3284 crypto_shash_update(shash, kaddr + pgoff, len);
3285 crypto_shash_final(shash, csum);
3287 if (memcmp(csum, csum_expected, csum_size))
3290 kunmap_atomic(kaddr);
3293 btrfs_print_data_csum_error(BTRFS_I(inode), start, csum, csum_expected,
3294 io_bio->mirror_num);
3295 memset(kaddr + pgoff, 1, len);
3296 flush_dcache_page(page);
3297 kunmap_atomic(kaddr);
3302 * when reads are done, we need to check csums to verify the data is correct
3303 * if there's a match, we allow the bio to finish. If not, the code in
3304 * extent_io.c will try to find good copies for us.
3306 static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
3307 u64 phy_offset, struct page *page,
3308 u64 start, u64 end, int mirror)
3310 size_t offset = start - page_offset(page);
3311 struct inode *inode = page->mapping->host;
3312 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
3313 struct btrfs_root *root = BTRFS_I(inode)->root;
3315 if (PageChecked(page)) {
3316 ClearPageChecked(page);
3320 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
3323 if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
3324 test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
3325 clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM);
3329 phy_offset >>= inode->i_sb->s_blocksize_bits;
3330 return __readpage_endio_check(inode, io_bio, phy_offset, page, offset,
3331 start, (size_t)(end - start + 1));
3335 * btrfs_add_delayed_iput - perform a delayed iput on @inode
3337 * @inode: The inode we want to perform iput on
3339 * This function uses the generic vfs_inode::i_count to track whether we should
3340 * just decrement it (in case it's > 1) or if this is the last iput then link
3341 * the inode to the delayed iput machinery. Delayed iputs are processed at
3342 * transaction commit time/superblock commit/cleaner kthread.
3344 void btrfs_add_delayed_iput(struct inode *inode)
3346 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3347 struct btrfs_inode *binode = BTRFS_I(inode);
3349 if (atomic_add_unless(&inode->i_count, -1, 1))
3352 atomic_inc(&fs_info->nr_delayed_iputs);
3353 spin_lock(&fs_info->delayed_iput_lock);
3354 ASSERT(list_empty(&binode->delayed_iput));
3355 list_add_tail(&binode->delayed_iput, &fs_info->delayed_iputs);
3356 spin_unlock(&fs_info->delayed_iput_lock);
3357 if (!test_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags))
3358 wake_up_process(fs_info->cleaner_kthread);
3361 static void run_delayed_iput_locked(struct btrfs_fs_info *fs_info,
3362 struct btrfs_inode *inode)
3364 list_del_init(&inode->delayed_iput);
3365 spin_unlock(&fs_info->delayed_iput_lock);
3366 iput(&inode->vfs_inode);
3367 if (atomic_dec_and_test(&fs_info->nr_delayed_iputs))
3368 wake_up(&fs_info->delayed_iputs_wait);
3369 spin_lock(&fs_info->delayed_iput_lock);
3372 static void btrfs_run_delayed_iput(struct btrfs_fs_info *fs_info,
3373 struct btrfs_inode *inode)
3375 if (!list_empty(&inode->delayed_iput)) {
3376 spin_lock(&fs_info->delayed_iput_lock);
3377 if (!list_empty(&inode->delayed_iput))
3378 run_delayed_iput_locked(fs_info, inode);
3379 spin_unlock(&fs_info->delayed_iput_lock);
3383 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info)
3386 spin_lock(&fs_info->delayed_iput_lock);
3387 while (!list_empty(&fs_info->delayed_iputs)) {
3388 struct btrfs_inode *inode;
3390 inode = list_first_entry(&fs_info->delayed_iputs,
3391 struct btrfs_inode, delayed_iput);
3392 run_delayed_iput_locked(fs_info, inode);
3394 spin_unlock(&fs_info->delayed_iput_lock);
3398 * btrfs_wait_on_delayed_iputs - wait on the delayed iputs to be done running
3399 * @fs_info - the fs_info for this fs
3400 * @return - EINTR if we were killed, 0 if nothing's pending
3402 * This will wait on any delayed iputs that are currently running with KILLABLE
3403 * set. Once they are all done running we will return, unless we are killed in
3404 * which case we return EINTR. This helps in user operations like fallocate etc
3405 * that might get blocked on the iputs.
3407 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info)
3409 int ret = wait_event_killable(fs_info->delayed_iputs_wait,
3410 atomic_read(&fs_info->nr_delayed_iputs) == 0);
3417 * This creates an orphan entry for the given inode in case something goes wrong
3418 * in the middle of an unlink.
3420 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3421 struct btrfs_inode *inode)
3425 ret = btrfs_insert_orphan_item(trans, inode->root, btrfs_ino(inode));
3426 if (ret && ret != -EEXIST) {
3427 btrfs_abort_transaction(trans, ret);
3435 * We have done the delete so we can go ahead and remove the orphan item for
3436 * this particular inode.
3438 static int btrfs_orphan_del(struct btrfs_trans_handle *trans,
3439 struct btrfs_inode *inode)
3441 return btrfs_del_orphan_item(trans, inode->root, btrfs_ino(inode));
3445 * this cleans up any orphans that may be left on the list from the last use
3448 int btrfs_orphan_cleanup(struct btrfs_root *root)
3450 struct btrfs_fs_info *fs_info = root->fs_info;
3451 struct btrfs_path *path;
3452 struct extent_buffer *leaf;
3453 struct btrfs_key key, found_key;
3454 struct btrfs_trans_handle *trans;
3455 struct inode *inode;
3456 u64 last_objectid = 0;
3457 int ret = 0, nr_unlink = 0;
3459 if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED))
3462 path = btrfs_alloc_path();
3467 path->reada = READA_BACK;
3469 key.objectid = BTRFS_ORPHAN_OBJECTID;
3470 key.type = BTRFS_ORPHAN_ITEM_KEY;
3471 key.offset = (u64)-1;
3474 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3479 * if ret == 0 means we found what we were searching for, which
3480 * is weird, but possible, so only screw with path if we didn't
3481 * find the key and see if we have stuff that matches
3485 if (path->slots[0] == 0)
3490 /* pull out the item */
3491 leaf = path->nodes[0];
3492 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
3494 /* make sure the item matches what we want */
3495 if (found_key.objectid != BTRFS_ORPHAN_OBJECTID)
3497 if (found_key.type != BTRFS_ORPHAN_ITEM_KEY)
3500 /* release the path since we're done with it */
3501 btrfs_release_path(path);
3504 * this is where we are basically btrfs_lookup, without the
3505 * crossing root thing. we store the inode number in the
3506 * offset of the orphan item.
3509 if (found_key.offset == last_objectid) {
3511 "Error removing orphan entry, stopping orphan cleanup");
3516 last_objectid = found_key.offset;
3518 found_key.objectid = found_key.offset;
3519 found_key.type = BTRFS_INODE_ITEM_KEY;
3520 found_key.offset = 0;
3521 inode = btrfs_iget(fs_info->sb, &found_key, root, NULL);
3522 ret = PTR_ERR_OR_ZERO(inode);
3523 if (ret && ret != -ENOENT)
3526 if (ret == -ENOENT && root == fs_info->tree_root) {
3527 struct btrfs_root *dead_root;
3528 struct btrfs_fs_info *fs_info = root->fs_info;
3529 int is_dead_root = 0;
3532 * this is an orphan in the tree root. Currently these
3533 * could come from 2 sources:
3534 * a) a snapshot deletion in progress
3535 * b) a free space cache inode
3536 * We need to distinguish those two, as the snapshot
3537 * orphan must not get deleted.
3538 * find_dead_roots already ran before us, so if this
3539 * is a snapshot deletion, we should find the root
3540 * in the dead_roots list
3542 spin_lock(&fs_info->trans_lock);
3543 list_for_each_entry(dead_root, &fs_info->dead_roots,
3545 if (dead_root->root_key.objectid ==
3546 found_key.objectid) {
3551 spin_unlock(&fs_info->trans_lock);
3553 /* prevent this orphan from being found again */
3554 key.offset = found_key.objectid - 1;
3561 * If we have an inode with links, there are a couple of
3562 * possibilities. Old kernels (before v3.12) used to create an
3563 * orphan item for truncate indicating that there were possibly
3564 * extent items past i_size that needed to be deleted. In v3.12,
3565 * truncate was changed to update i_size in sync with the extent
3566 * items, but the (useless) orphan item was still created. Since
3567 * v4.18, we don't create the orphan item for truncate at all.
3569 * So, this item could mean that we need to do a truncate, but
3570 * only if this filesystem was last used on a pre-v3.12 kernel
3571 * and was not cleanly unmounted. The odds of that are quite
3572 * slim, and it's a pain to do the truncate now, so just delete
3575 * It's also possible that this orphan item was supposed to be
3576 * deleted but wasn't. The inode number may have been reused,
3577 * but either way, we can delete the orphan item.
3579 if (ret == -ENOENT || inode->i_nlink) {
3582 trans = btrfs_start_transaction(root, 1);
3583 if (IS_ERR(trans)) {
3584 ret = PTR_ERR(trans);
3587 btrfs_debug(fs_info, "auto deleting %Lu",
3588 found_key.objectid);
3589 ret = btrfs_del_orphan_item(trans, root,
3590 found_key.objectid);
3591 btrfs_end_transaction(trans);
3599 /* this will do delete_inode and everything for us */
3602 /* release the path since we're done with it */
3603 btrfs_release_path(path);
3605 root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE;
3607 if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) {
3608 trans = btrfs_join_transaction(root);
3610 btrfs_end_transaction(trans);
3614 btrfs_debug(fs_info, "unlinked %d orphans", nr_unlink);
3618 btrfs_err(fs_info, "could not do orphan cleanup %d", ret);
3619 btrfs_free_path(path);
3624 * very simple check to peek ahead in the leaf looking for xattrs. If we
3625 * don't find any xattrs, we know there can't be any acls.
3627 * slot is the slot the inode is in, objectid is the objectid of the inode
3629 static noinline int acls_after_inode_item(struct extent_buffer *leaf,
3630 int slot, u64 objectid,
3631 int *first_xattr_slot)
3633 u32 nritems = btrfs_header_nritems(leaf);
3634 struct btrfs_key found_key;
3635 static u64 xattr_access = 0;
3636 static u64 xattr_default = 0;
3639 if (!xattr_access) {
3640 xattr_access = btrfs_name_hash(XATTR_NAME_POSIX_ACL_ACCESS,
3641 strlen(XATTR_NAME_POSIX_ACL_ACCESS));
3642 xattr_default = btrfs_name_hash(XATTR_NAME_POSIX_ACL_DEFAULT,
3643 strlen(XATTR_NAME_POSIX_ACL_DEFAULT));
3647 *first_xattr_slot = -1;
3648 while (slot < nritems) {
3649 btrfs_item_key_to_cpu(leaf, &found_key, slot);
3651 /* we found a different objectid, there must not be acls */
3652 if (found_key.objectid != objectid)
3655 /* we found an xattr, assume we've got an acl */
3656 if (found_key.type == BTRFS_XATTR_ITEM_KEY) {
3657 if (*first_xattr_slot == -1)
3658 *first_xattr_slot = slot;
3659 if (found_key.offset == xattr_access ||
3660 found_key.offset == xattr_default)
3665 * we found a key greater than an xattr key, there can't
3666 * be any acls later on
3668 if (found_key.type > BTRFS_XATTR_ITEM_KEY)
3675 * it goes inode, inode backrefs, xattrs, extents,
3676 * so if there are a ton of hard links to an inode there can
3677 * be a lot of backrefs. Don't waste time searching too hard,
3678 * this is just an optimization
3683 /* we hit the end of the leaf before we found an xattr or
3684 * something larger than an xattr. We have to assume the inode
3687 if (*first_xattr_slot == -1)
3688 *first_xattr_slot = slot;
3693 * read an inode from the btree into the in-memory inode
3695 static int btrfs_read_locked_inode(struct inode *inode,
3696 struct btrfs_path *in_path)
3698 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3699 struct btrfs_path *path = in_path;
3700 struct extent_buffer *leaf;
3701 struct btrfs_inode_item *inode_item;
3702 struct btrfs_root *root = BTRFS_I(inode)->root;
3703 struct btrfs_key location;
3708 bool filled = false;
3709 int first_xattr_slot;
3711 ret = btrfs_fill_inode(inode, &rdev);
3716 path = btrfs_alloc_path();
3721 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
3723 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
3725 if (path != in_path)
3726 btrfs_free_path(path);
3730 leaf = path->nodes[0];
3735 inode_item = btrfs_item_ptr(leaf, path->slots[0],
3736 struct btrfs_inode_item);
3737 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
3738 set_nlink(inode, btrfs_inode_nlink(leaf, inode_item));
3739 i_uid_write(inode, btrfs_inode_uid(leaf, inode_item));
3740 i_gid_write(inode, btrfs_inode_gid(leaf, inode_item));
3741 btrfs_i_size_write(BTRFS_I(inode), btrfs_inode_size(leaf, inode_item));
3743 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime);
3744 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime);
3746 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime);
3747 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime);
3749 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime);
3750 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime);
3752 BTRFS_I(inode)->i_otime.tv_sec =
3753 btrfs_timespec_sec(leaf, &inode_item->otime);
3754 BTRFS_I(inode)->i_otime.tv_nsec =
3755 btrfs_timespec_nsec(leaf, &inode_item->otime);
3757 inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item));
3758 BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item);
3759 BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item);
3761 inode_set_iversion_queried(inode,
3762 btrfs_inode_sequence(leaf, inode_item));
3763 inode->i_generation = BTRFS_I(inode)->generation;
3765 rdev = btrfs_inode_rdev(leaf, inode_item);
3767 BTRFS_I(inode)->index_cnt = (u64)-1;
3768 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
3772 * If we were modified in the current generation and evicted from memory
3773 * and then re-read we need to do a full sync since we don't have any
3774 * idea about which extents were modified before we were evicted from
3777 * This is required for both inode re-read from disk and delayed inode
3778 * in delayed_nodes_tree.
3780 if (BTRFS_I(inode)->last_trans == fs_info->generation)
3781 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3782 &BTRFS_I(inode)->runtime_flags);
3785 * We don't persist the id of the transaction where an unlink operation
3786 * against the inode was last made. So here we assume the inode might
3787 * have been evicted, and therefore the exact value of last_unlink_trans
3788 * lost, and set it to last_trans to avoid metadata inconsistencies
3789 * between the inode and its parent if the inode is fsync'ed and the log
3790 * replayed. For example, in the scenario:
3793 * ln mydir/foo mydir/bar
3796 * echo 2 > /proc/sys/vm/drop_caches # evicts inode
3797 * xfs_io -c fsync mydir/foo
3799 * mount fs, triggers fsync log replay
3801 * We must make sure that when we fsync our inode foo we also log its
3802 * parent inode, otherwise after log replay the parent still has the
3803 * dentry with the "bar" name but our inode foo has a link count of 1
3804 * and doesn't have an inode ref with the name "bar" anymore.
3806 * Setting last_unlink_trans to last_trans is a pessimistic approach,
3807 * but it guarantees correctness at the expense of occasional full
3808 * transaction commits on fsync if our inode is a directory, or if our
3809 * inode is not a directory, logging its parent unnecessarily.
3811 BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans;
3814 if (inode->i_nlink != 1 ||
3815 path->slots[0] >= btrfs_header_nritems(leaf))
3818 btrfs_item_key_to_cpu(leaf, &location, path->slots[0]);
3819 if (location.objectid != btrfs_ino(BTRFS_I(inode)))
3822 ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
3823 if (location.type == BTRFS_INODE_REF_KEY) {
3824 struct btrfs_inode_ref *ref;
3826 ref = (struct btrfs_inode_ref *)ptr;
3827 BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref);
3828 } else if (location.type == BTRFS_INODE_EXTREF_KEY) {
3829 struct btrfs_inode_extref *extref;
3831 extref = (struct btrfs_inode_extref *)ptr;
3832 BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf,
3837 * try to precache a NULL acl entry for files that don't have
3838 * any xattrs or acls
3840 maybe_acls = acls_after_inode_item(leaf, path->slots[0],
3841 btrfs_ino(BTRFS_I(inode)), &first_xattr_slot);
3842 if (first_xattr_slot != -1) {
3843 path->slots[0] = first_xattr_slot;
3844 ret = btrfs_load_inode_props(inode, path);
3847 "error loading props for ino %llu (root %llu): %d",
3848 btrfs_ino(BTRFS_I(inode)),
3849 root->root_key.objectid, ret);
3851 if (path != in_path)
3852 btrfs_free_path(path);
3855 cache_no_acl(inode);
3857 switch (inode->i_mode & S_IFMT) {
3859 inode->i_mapping->a_ops = &btrfs_aops;
3860 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3861 inode->i_fop = &btrfs_file_operations;
3862 inode->i_op = &btrfs_file_inode_operations;
3865 inode->i_fop = &btrfs_dir_file_operations;
3866 inode->i_op = &btrfs_dir_inode_operations;
3869 inode->i_op = &btrfs_symlink_inode_operations;
3870 inode_nohighmem(inode);
3871 inode->i_mapping->a_ops = &btrfs_aops;
3874 inode->i_op = &btrfs_special_inode_operations;
3875 init_special_inode(inode, inode->i_mode, rdev);
3879 btrfs_sync_inode_flags_to_i_flags(inode);
3884 * given a leaf and an inode, copy the inode fields into the leaf
3886 static void fill_inode_item(struct btrfs_trans_handle *trans,
3887 struct extent_buffer *leaf,
3888 struct btrfs_inode_item *item,
3889 struct inode *inode)
3891 struct btrfs_map_token token;
3893 btrfs_init_map_token(&token, leaf);
3895 btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token);
3896 btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token);
3897 btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size,
3899 btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token);
3900 btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token);
3902 btrfs_set_token_timespec_sec(leaf, &item->atime,
3903 inode->i_atime.tv_sec, &token);
3904 btrfs_set_token_timespec_nsec(leaf, &item->atime,
3905 inode->i_atime.tv_nsec, &token);
3907 btrfs_set_token_timespec_sec(leaf, &item->mtime,
3908 inode->i_mtime.tv_sec, &token);
3909 btrfs_set_token_timespec_nsec(leaf, &item->mtime,
3910 inode->i_mtime.tv_nsec, &token);
3912 btrfs_set_token_timespec_sec(leaf, &item->ctime,
3913 inode->i_ctime.tv_sec, &token);
3914 btrfs_set_token_timespec_nsec(leaf, &item->ctime,
3915 inode->i_ctime.tv_nsec, &token);
3917 btrfs_set_token_timespec_sec(leaf, &item->otime,
3918 BTRFS_I(inode)->i_otime.tv_sec, &token);
3919 btrfs_set_token_timespec_nsec(leaf, &item->otime,
3920 BTRFS_I(inode)->i_otime.tv_nsec, &token);
3922 btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode),
3924 btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation,
3926 btrfs_set_token_inode_sequence(leaf, item, inode_peek_iversion(inode),
3928 btrfs_set_token_inode_transid(leaf, item, trans->transid, &token);
3929 btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token);
3930 btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token);
3931 btrfs_set_token_inode_block_group(leaf, item, 0, &token);
3935 * copy everything in the in-memory inode into the btree.
3937 static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans,
3938 struct btrfs_root *root, struct inode *inode)
3940 struct btrfs_inode_item *inode_item;
3941 struct btrfs_path *path;
3942 struct extent_buffer *leaf;
3945 path = btrfs_alloc_path();
3949 path->leave_spinning = 1;
3950 ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location,
3958 leaf = path->nodes[0];
3959 inode_item = btrfs_item_ptr(leaf, path->slots[0],
3960 struct btrfs_inode_item);
3962 fill_inode_item(trans, leaf, inode_item, inode);
3963 btrfs_mark_buffer_dirty(leaf);
3964 btrfs_set_inode_last_trans(trans, inode);
3967 btrfs_free_path(path);
3972 * copy everything in the in-memory inode into the btree.
3974 noinline int btrfs_update_inode(struct btrfs_trans_handle *trans,
3975 struct btrfs_root *root, struct inode *inode)
3977 struct btrfs_fs_info *fs_info = root->fs_info;
3981 * If the inode is a free space inode, we can deadlock during commit
3982 * if we put it into the delayed code.
3984 * The data relocation inode should also be directly updated
3987 if (!btrfs_is_free_space_inode(BTRFS_I(inode))
3988 && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
3989 && !test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags)) {
3990 btrfs_update_root_times(trans, root);
3992 ret = btrfs_delayed_update_inode(trans, root, inode);
3994 btrfs_set_inode_last_trans(trans, inode);
3998 return btrfs_update_inode_item(trans, root, inode);
4001 noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
4002 struct btrfs_root *root,
4003 struct inode *inode)
4007 ret = btrfs_update_inode(trans, root, inode);
4009 return btrfs_update_inode_item(trans, root, inode);
4014 * unlink helper that gets used here in inode.c and in the tree logging
4015 * recovery code. It remove a link in a directory with a given name, and
4016 * also drops the back refs in the inode to the directory
4018 static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans,
4019 struct btrfs_root *root,
4020 struct btrfs_inode *dir,
4021 struct btrfs_inode *inode,
4022 const char *name, int name_len)
4024 struct btrfs_fs_info *fs_info = root->fs_info;
4025 struct btrfs_path *path;
4027 struct btrfs_dir_item *di;
4029 u64 ino = btrfs_ino(inode);
4030 u64 dir_ino = btrfs_ino(dir);
4032 path = btrfs_alloc_path();
4038 path->leave_spinning = 1;
4039 di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
4040 name, name_len, -1);
4041 if (IS_ERR_OR_NULL(di)) {
4042 ret = di ? PTR_ERR(di) : -ENOENT;
4045 ret = btrfs_delete_one_dir_name(trans, root, path, di);
4048 btrfs_release_path(path);
4051 * If we don't have dir index, we have to get it by looking up
4052 * the inode ref, since we get the inode ref, remove it directly,
4053 * it is unnecessary to do delayed deletion.
4055 * But if we have dir index, needn't search inode ref to get it.
4056 * Since the inode ref is close to the inode item, it is better
4057 * that we delay to delete it, and just do this deletion when
4058 * we update the inode item.
4060 if (inode->dir_index) {
4061 ret = btrfs_delayed_delete_inode_ref(inode);
4063 index = inode->dir_index;
4068 ret = btrfs_del_inode_ref(trans, root, name, name_len, ino,
4072 "failed to delete reference to %.*s, inode %llu parent %llu",
4073 name_len, name, ino, dir_ino);
4074 btrfs_abort_transaction(trans, ret);
4078 ret = btrfs_delete_delayed_dir_index(trans, dir, index);
4080 btrfs_abort_transaction(trans, ret);
4084 ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, inode,
4086 if (ret != 0 && ret != -ENOENT) {
4087 btrfs_abort_transaction(trans, ret);
4091 ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, dir,
4096 btrfs_abort_transaction(trans, ret);
4099 * If we have a pending delayed iput we could end up with the final iput
4100 * being run in btrfs-cleaner context. If we have enough of these built
4101 * up we can end up burning a lot of time in btrfs-cleaner without any
4102 * way to throttle the unlinks. Since we're currently holding a ref on
4103 * the inode we can run the delayed iput here without any issues as the
4104 * final iput won't be done until after we drop the ref we're currently
4107 btrfs_run_delayed_iput(fs_info, inode);
4109 btrfs_free_path(path);
4113 btrfs_i_size_write(dir, dir->vfs_inode.i_size - name_len * 2);
4114 inode_inc_iversion(&inode->vfs_inode);
4115 inode_inc_iversion(&dir->vfs_inode);
4116 inode->vfs_inode.i_ctime = dir->vfs_inode.i_mtime =
4117 dir->vfs_inode.i_ctime = current_time(&inode->vfs_inode);
4118 ret = btrfs_update_inode(trans, root, &dir->vfs_inode);
4123 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
4124 struct btrfs_root *root,
4125 struct btrfs_inode *dir, struct btrfs_inode *inode,
4126 const char *name, int name_len)
4129 ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len);
4131 drop_nlink(&inode->vfs_inode);
4132 ret = btrfs_update_inode(trans, root, &inode->vfs_inode);
4138 * helper to start transaction for unlink and rmdir.
4140 * unlink and rmdir are special in btrfs, they do not always free space, so
4141 * if we cannot make our reservations the normal way try and see if there is
4142 * plenty of slack room in the global reserve to migrate, otherwise we cannot
4143 * allow the unlink to occur.
4145 static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir)
4147 struct btrfs_root *root = BTRFS_I(dir)->root;
4150 * 1 for the possible orphan item
4151 * 1 for the dir item
4152 * 1 for the dir index
4153 * 1 for the inode ref
4156 return btrfs_start_transaction_fallback_global_rsv(root, 5, 5);
4159 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
4161 struct btrfs_root *root = BTRFS_I(dir)->root;
4162 struct btrfs_trans_handle *trans;
4163 struct inode *inode = d_inode(dentry);
4166 trans = __unlink_start_trans(dir);
4168 return PTR_ERR(trans);
4170 btrfs_record_unlink_dir(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)),
4173 ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
4174 BTRFS_I(d_inode(dentry)), dentry->d_name.name,
4175 dentry->d_name.len);
4179 if (inode->i_nlink == 0) {
4180 ret = btrfs_orphan_add(trans, BTRFS_I(inode));
4186 btrfs_end_transaction(trans);
4187 btrfs_btree_balance_dirty(root->fs_info);
4191 static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
4192 struct inode *dir, u64 objectid,
4193 const char *name, int name_len)
4195 struct btrfs_root *root = BTRFS_I(dir)->root;
4196 struct btrfs_path *path;
4197 struct extent_buffer *leaf;
4198 struct btrfs_dir_item *di;
4199 struct btrfs_key key;
4202 u64 dir_ino = btrfs_ino(BTRFS_I(dir));
4204 path = btrfs_alloc_path();
4208 di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
4209 name, name_len, -1);
4210 if (IS_ERR_OR_NULL(di)) {
4211 ret = di ? PTR_ERR(di) : -ENOENT;
4215 leaf = path->nodes[0];
4216 btrfs_dir_item_key_to_cpu(leaf, di, &key);
4217 WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
4218 ret = btrfs_delete_one_dir_name(trans, root, path, di);
4220 btrfs_abort_transaction(trans, ret);
4223 btrfs_release_path(path);
4225 ret = btrfs_del_root_ref(trans, objectid, root->root_key.objectid,
4226 dir_ino, &index, name, name_len);
4228 if (ret != -ENOENT) {
4229 btrfs_abort_transaction(trans, ret);
4232 di = btrfs_search_dir_index_item(root, path, dir_ino,
4234 if (IS_ERR_OR_NULL(di)) {
4239 btrfs_abort_transaction(trans, ret);
4243 leaf = path->nodes[0];
4244 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
4247 btrfs_release_path(path);
4249 ret = btrfs_delete_delayed_dir_index(trans, BTRFS_I(dir), index);
4251 btrfs_abort_transaction(trans, ret);
4255 btrfs_i_size_write(BTRFS_I(dir), dir->i_size - name_len * 2);
4256 inode_inc_iversion(dir);
4257 dir->i_mtime = dir->i_ctime = current_time(dir);
4258 ret = btrfs_update_inode_fallback(trans, root, dir);
4260 btrfs_abort_transaction(trans, ret);
4262 btrfs_free_path(path);
4267 * Helper to check if the subvolume references other subvolumes or if it's
4270 static noinline int may_destroy_subvol(struct btrfs_root *root)
4272 struct btrfs_fs_info *fs_info = root->fs_info;
4273 struct btrfs_path *path;
4274 struct btrfs_dir_item *di;
4275 struct btrfs_key key;
4279 path = btrfs_alloc_path();
4283 /* Make sure this root isn't set as the default subvol */
4284 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4285 di = btrfs_lookup_dir_item(NULL, fs_info->tree_root, path,
4286 dir_id, "default", 7, 0);
4287 if (di && !IS_ERR(di)) {
4288 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
4289 if (key.objectid == root->root_key.objectid) {
4292 "deleting default subvolume %llu is not allowed",
4296 btrfs_release_path(path);
4299 key.objectid = root->root_key.objectid;
4300 key.type = BTRFS_ROOT_REF_KEY;
4301 key.offset = (u64)-1;
4303 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
4309 if (path->slots[0] > 0) {
4311 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
4312 if (key.objectid == root->root_key.objectid &&
4313 key.type == BTRFS_ROOT_REF_KEY)
4317 btrfs_free_path(path);
4321 /* Delete all dentries for inodes belonging to the root */
4322 static void btrfs_prune_dentries(struct btrfs_root *root)
4324 struct btrfs_fs_info *fs_info = root->fs_info;
4325 struct rb_node *node;
4326 struct rb_node *prev;
4327 struct btrfs_inode *entry;
4328 struct inode *inode;
4331 if (!test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
4332 WARN_ON(btrfs_root_refs(&root->root_item) != 0);
4334 spin_lock(&root->inode_lock);
4336 node = root->inode_tree.rb_node;
4340 entry = rb_entry(node, struct btrfs_inode, rb_node);
4342 if (objectid < btrfs_ino(entry))
4343 node = node->rb_left;
4344 else if (objectid > btrfs_ino(entry))
4345 node = node->rb_right;
4351 entry = rb_entry(prev, struct btrfs_inode, rb_node);
4352 if (objectid <= btrfs_ino(entry)) {
4356 prev = rb_next(prev);
4360 entry = rb_entry(node, struct btrfs_inode, rb_node);
4361 objectid = btrfs_ino(entry) + 1;
4362 inode = igrab(&entry->vfs_inode);
4364 spin_unlock(&root->inode_lock);
4365 if (atomic_read(&inode->i_count) > 1)
4366 d_prune_aliases(inode);
4368 * btrfs_drop_inode will have it removed from the inode
4369 * cache when its usage count hits zero.
4373 spin_lock(&root->inode_lock);
4377 if (cond_resched_lock(&root->inode_lock))
4380 node = rb_next(node);
4382 spin_unlock(&root->inode_lock);
4385 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
4387 struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
4388 struct btrfs_root *root = BTRFS_I(dir)->root;
4389 struct inode *inode = d_inode(dentry);
4390 struct btrfs_root *dest = BTRFS_I(inode)->root;
4391 struct btrfs_trans_handle *trans;
4392 struct btrfs_block_rsv block_rsv;
4398 * Don't allow to delete a subvolume with send in progress. This is
4399 * inside the inode lock so the error handling that has to drop the bit
4400 * again is not run concurrently.
4402 spin_lock(&dest->root_item_lock);
4403 if (dest->send_in_progress) {
4404 spin_unlock(&dest->root_item_lock);
4406 "attempt to delete subvolume %llu during send",
4407 dest->root_key.objectid);
4410 root_flags = btrfs_root_flags(&dest->root_item);
4411 btrfs_set_root_flags(&dest->root_item,
4412 root_flags | BTRFS_ROOT_SUBVOL_DEAD);
4413 spin_unlock(&dest->root_item_lock);
4415 down_write(&fs_info->subvol_sem);
4417 err = may_destroy_subvol(dest);
4421 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
4423 * One for dir inode,
4424 * two for dir entries,
4425 * two for root ref/backref.
4427 err = btrfs_subvolume_reserve_metadata(root, &block_rsv, 5, true);
4431 trans = btrfs_start_transaction(root, 0);
4432 if (IS_ERR(trans)) {
4433 err = PTR_ERR(trans);
4436 trans->block_rsv = &block_rsv;
4437 trans->bytes_reserved = block_rsv.size;
4439 btrfs_record_snapshot_destroy(trans, BTRFS_I(dir));
4441 ret = btrfs_unlink_subvol(trans, dir, dest->root_key.objectid,
4442 dentry->d_name.name, dentry->d_name.len);
4445 btrfs_abort_transaction(trans, ret);
4449 btrfs_record_root_in_trans(trans, dest);
4451 memset(&dest->root_item.drop_progress, 0,
4452 sizeof(dest->root_item.drop_progress));
4453 dest->root_item.drop_level = 0;
4454 btrfs_set_root_refs(&dest->root_item, 0);
4456 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
4457 ret = btrfs_insert_orphan_item(trans,
4459 dest->root_key.objectid);
4461 btrfs_abort_transaction(trans, ret);
4467 ret = btrfs_uuid_tree_remove(trans, dest->root_item.uuid,
4468 BTRFS_UUID_KEY_SUBVOL,
4469 dest->root_key.objectid);
4470 if (ret && ret != -ENOENT) {
4471 btrfs_abort_transaction(trans, ret);
4475 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
4476 ret = btrfs_uuid_tree_remove(trans,
4477 dest->root_item.received_uuid,
4478 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4479 dest->root_key.objectid);
4480 if (ret && ret != -ENOENT) {
4481 btrfs_abort_transaction(trans, ret);
4488 trans->block_rsv = NULL;
4489 trans->bytes_reserved = 0;
4490 ret = btrfs_end_transaction(trans);
4493 inode->i_flags |= S_DEAD;
4495 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
4497 up_write(&fs_info->subvol_sem);
4499 spin_lock(&dest->root_item_lock);
4500 root_flags = btrfs_root_flags(&dest->root_item);
4501 btrfs_set_root_flags(&dest->root_item,
4502 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
4503 spin_unlock(&dest->root_item_lock);
4505 d_invalidate(dentry);
4506 btrfs_prune_dentries(dest);
4507 ASSERT(dest->send_in_progress == 0);
4510 if (dest->ino_cache_inode) {
4511 iput(dest->ino_cache_inode);
4512 dest->ino_cache_inode = NULL;
4519 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
4521 struct inode *inode = d_inode(dentry);
4523 struct btrfs_root *root = BTRFS_I(dir)->root;
4524 struct btrfs_trans_handle *trans;
4525 u64 last_unlink_trans;
4527 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
4529 if (btrfs_ino(BTRFS_I(inode)) == BTRFS_FIRST_FREE_OBJECTID)
4530 return btrfs_delete_subvolume(dir, dentry);
4532 trans = __unlink_start_trans(dir);
4534 return PTR_ERR(trans);
4536 if (unlikely(btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
4537 err = btrfs_unlink_subvol(trans, dir,
4538 BTRFS_I(inode)->location.objectid,
4539 dentry->d_name.name,
4540 dentry->d_name.len);
4544 err = btrfs_orphan_add(trans, BTRFS_I(inode));
4548 last_unlink_trans = BTRFS_I(inode)->last_unlink_trans;
4550 /* now the directory is empty */
4551 err = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
4552 BTRFS_I(d_inode(dentry)), dentry->d_name.name,
4553 dentry->d_name.len);
4555 btrfs_i_size_write(BTRFS_I(inode), 0);
4557 * Propagate the last_unlink_trans value of the deleted dir to
4558 * its parent directory. This is to prevent an unrecoverable
4559 * log tree in the case we do something like this:
4561 * 2) create snapshot under dir foo
4562 * 3) delete the snapshot
4565 * 6) fsync foo or some file inside foo
4567 if (last_unlink_trans >= trans->transid)
4568 BTRFS_I(dir)->last_unlink_trans = last_unlink_trans;
4571 btrfs_end_transaction(trans);
4572 btrfs_btree_balance_dirty(root->fs_info);
4578 * Return this if we need to call truncate_block for the last bit of the
4581 #define NEED_TRUNCATE_BLOCK 1
4584 * this can truncate away extent items, csum items and directory items.
4585 * It starts at a high offset and removes keys until it can't find
4586 * any higher than new_size
4588 * csum items that cross the new i_size are truncated to the new size
4591 * min_type is the minimum key type to truncate down to. If set to 0, this
4592 * will kill all the items on this inode, including the INODE_ITEM_KEY.
4594 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
4595 struct btrfs_root *root,
4596 struct inode *inode,
4597 u64 new_size, u32 min_type)
4599 struct btrfs_fs_info *fs_info = root->fs_info;
4600 struct btrfs_path *path;
4601 struct extent_buffer *leaf;
4602 struct btrfs_file_extent_item *fi;
4603 struct btrfs_key key;
4604 struct btrfs_key found_key;
4605 u64 extent_start = 0;
4606 u64 extent_num_bytes = 0;
4607 u64 extent_offset = 0;
4609 u64 last_size = new_size;
4610 u32 found_type = (u8)-1;
4613 int pending_del_nr = 0;
4614 int pending_del_slot = 0;
4615 int extent_type = -1;
4617 u64 ino = btrfs_ino(BTRFS_I(inode));
4618 u64 bytes_deleted = 0;
4619 bool be_nice = false;
4620 bool should_throttle = false;
4622 BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY);
4625 * for non-free space inodes and ref cows, we want to back off from
4628 if (!btrfs_is_free_space_inode(BTRFS_I(inode)) &&
4629 test_bit(BTRFS_ROOT_REF_COWS, &root->state))
4632 path = btrfs_alloc_path();
4635 path->reada = READA_BACK;
4638 * We want to drop from the next block forward in case this new size is
4639 * not block aligned since we will be keeping the last block of the
4640 * extent just the way it is.
4642 if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
4643 root == fs_info->tree_root)
4644 btrfs_drop_extent_cache(BTRFS_I(inode), ALIGN(new_size,
4645 fs_info->sectorsize),
4649 * This function is also used to drop the items in the log tree before
4650 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
4651 * it is used to drop the logged items. So we shouldn't kill the delayed
4654 if (min_type == 0 && root == BTRFS_I(inode)->root)
4655 btrfs_kill_delayed_inode_items(BTRFS_I(inode));
4658 key.offset = (u64)-1;
4663 * with a 16K leaf size and 128MB extents, you can actually queue
4664 * up a huge file in a single leaf. Most of the time that
4665 * bytes_deleted is > 0, it will be huge by the time we get here
4667 if (be_nice && bytes_deleted > SZ_32M &&
4668 btrfs_should_end_transaction(trans)) {
4673 path->leave_spinning = 1;
4674 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
4680 /* there are no items in the tree for us to truncate, we're
4683 if (path->slots[0] == 0)
4690 leaf = path->nodes[0];
4691 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
4692 found_type = found_key.type;
4694 if (found_key.objectid != ino)
4697 if (found_type < min_type)
4700 item_end = found_key.offset;
4701 if (found_type == BTRFS_EXTENT_DATA_KEY) {
4702 fi = btrfs_item_ptr(leaf, path->slots[0],
4703 struct btrfs_file_extent_item);
4704 extent_type = btrfs_file_extent_type(leaf, fi);
4705 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
4707 btrfs_file_extent_num_bytes(leaf, fi);
4709 trace_btrfs_truncate_show_fi_regular(
4710 BTRFS_I(inode), leaf, fi,
4712 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
4713 item_end += btrfs_file_extent_ram_bytes(leaf,
4716 trace_btrfs_truncate_show_fi_inline(
4717 BTRFS_I(inode), leaf, fi, path->slots[0],
4722 if (found_type > min_type) {
4725 if (item_end < new_size)
4727 if (found_key.offset >= new_size)
4733 /* FIXME, shrink the extent if the ref count is only 1 */
4734 if (found_type != BTRFS_EXTENT_DATA_KEY)
4737 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
4739 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
4741 u64 orig_num_bytes =
4742 btrfs_file_extent_num_bytes(leaf, fi);
4743 extent_num_bytes = ALIGN(new_size -
4745 fs_info->sectorsize);
4746 btrfs_set_file_extent_num_bytes(leaf, fi,
4748 num_dec = (orig_num_bytes -
4750 if (test_bit(BTRFS_ROOT_REF_COWS,
4753 inode_sub_bytes(inode, num_dec);
4754 btrfs_mark_buffer_dirty(leaf);
4757 btrfs_file_extent_disk_num_bytes(leaf,
4759 extent_offset = found_key.offset -
4760 btrfs_file_extent_offset(leaf, fi);
4762 /* FIXME blocksize != 4096 */
4763 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
4764 if (extent_start != 0) {
4766 if (test_bit(BTRFS_ROOT_REF_COWS,
4768 inode_sub_bytes(inode, num_dec);
4771 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
4773 * we can't truncate inline items that have had
4777 btrfs_file_extent_encryption(leaf, fi) == 0 &&
4778 btrfs_file_extent_other_encoding(leaf, fi) == 0 &&
4779 btrfs_file_extent_compression(leaf, fi) == 0) {
4780 u32 size = (u32)(new_size - found_key.offset);
4782 btrfs_set_file_extent_ram_bytes(leaf, fi, size);
4783 size = btrfs_file_extent_calc_inline_size(size);
4784 btrfs_truncate_item(path, size, 1);
4785 } else if (!del_item) {
4787 * We have to bail so the last_size is set to
4788 * just before this extent.
4790 ret = NEED_TRUNCATE_BLOCK;
4794 if (test_bit(BTRFS_ROOT_REF_COWS, &root->state))
4795 inode_sub_bytes(inode, item_end + 1 - new_size);
4799 last_size = found_key.offset;
4801 last_size = new_size;
4803 if (!pending_del_nr) {
4804 /* no pending yet, add ourselves */
4805 pending_del_slot = path->slots[0];
4807 } else if (pending_del_nr &&
4808 path->slots[0] + 1 == pending_del_slot) {
4809 /* hop on the pending chunk */
4811 pending_del_slot = path->slots[0];
4818 should_throttle = false;
4821 (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
4822 root == fs_info->tree_root)) {
4823 struct btrfs_ref ref = { 0 };
4825 btrfs_set_path_blocking(path);
4826 bytes_deleted += extent_num_bytes;
4828 btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF,
4829 extent_start, extent_num_bytes, 0);
4830 ref.real_root = root->root_key.objectid;
4831 btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
4832 ino, extent_offset);
4833 ret = btrfs_free_extent(trans, &ref);
4835 btrfs_abort_transaction(trans, ret);
4839 if (btrfs_should_throttle_delayed_refs(trans))
4840 should_throttle = true;
4844 if (found_type == BTRFS_INODE_ITEM_KEY)
4847 if (path->slots[0] == 0 ||
4848 path->slots[0] != pending_del_slot ||
4850 if (pending_del_nr) {
4851 ret = btrfs_del_items(trans, root, path,
4855 btrfs_abort_transaction(trans, ret);
4860 btrfs_release_path(path);
4863 * We can generate a lot of delayed refs, so we need to
4864 * throttle every once and a while and make sure we're
4865 * adding enough space to keep up with the work we are
4866 * generating. Since we hold a transaction here we
4867 * can't flush, and we don't want to FLUSH_LIMIT because
4868 * we could have generated too many delayed refs to
4869 * actually allocate, so just bail if we're short and
4870 * let the normal reservation dance happen higher up.
4872 if (should_throttle) {
4873 ret = btrfs_delayed_refs_rsv_refill(fs_info,
4874 BTRFS_RESERVE_NO_FLUSH);
4886 if (ret >= 0 && pending_del_nr) {
4889 err = btrfs_del_items(trans, root, path, pending_del_slot,
4892 btrfs_abort_transaction(trans, err);
4896 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
4897 ASSERT(last_size >= new_size);
4898 if (!ret && last_size > new_size)
4899 last_size = new_size;
4900 btrfs_ordered_update_i_size(inode, last_size, NULL);
4903 btrfs_free_path(path);
4908 * btrfs_truncate_block - read, zero a chunk and write a block
4909 * @inode - inode that we're zeroing
4910 * @from - the offset to start zeroing
4911 * @len - the length to zero, 0 to zero the entire range respective to the
4913 * @front - zero up to the offset instead of from the offset on
4915 * This will find the block for the "from" offset and cow the block and zero the
4916 * part we want to zero. This is used with truncate and hole punching.
4918 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
4921 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4922 struct address_space *mapping = inode->i_mapping;
4923 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
4924 struct btrfs_ordered_extent *ordered;
4925 struct extent_state *cached_state = NULL;
4926 struct extent_changeset *data_reserved = NULL;
4928 u32 blocksize = fs_info->sectorsize;
4929 pgoff_t index = from >> PAGE_SHIFT;
4930 unsigned offset = from & (blocksize - 1);
4932 gfp_t mask = btrfs_alloc_write_mask(mapping);
4937 if (IS_ALIGNED(offset, blocksize) &&
4938 (!len || IS_ALIGNED(len, blocksize)))
4941 block_start = round_down(from, blocksize);
4942 block_end = block_start + blocksize - 1;
4944 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
4945 block_start, blocksize);
4950 page = find_or_create_page(mapping, index, mask);
4952 btrfs_delalloc_release_space(inode, data_reserved,
4953 block_start, blocksize, true);
4954 btrfs_delalloc_release_extents(BTRFS_I(inode), blocksize);
4959 if (!PageUptodate(page)) {
4960 ret = btrfs_readpage(NULL, page);
4962 if (page->mapping != mapping) {
4967 if (!PageUptodate(page)) {
4972 wait_on_page_writeback(page);
4974 lock_extent_bits(io_tree, block_start, block_end, &cached_state);
4975 set_page_extent_mapped(page);
4977 ordered = btrfs_lookup_ordered_extent(inode, block_start);
4979 unlock_extent_cached(io_tree, block_start, block_end,
4983 btrfs_start_ordered_extent(inode, ordered, 1);
4984 btrfs_put_ordered_extent(ordered);
4988 clear_extent_bit(&BTRFS_I(inode)->io_tree, block_start, block_end,
4989 EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
4990 0, 0, &cached_state);
4992 ret = btrfs_set_extent_delalloc(inode, block_start, block_end, 0,
4995 unlock_extent_cached(io_tree, block_start, block_end,
5000 if (offset != blocksize) {
5002 len = blocksize - offset;
5005 memset(kaddr + (block_start - page_offset(page)),
5008 memset(kaddr + (block_start - page_offset(page)) + offset,
5010 flush_dcache_page(page);
5013 ClearPageChecked(page);
5014 set_page_dirty(page);
5015 unlock_extent_cached(io_tree, block_start, block_end, &cached_state);
5019 btrfs_delalloc_release_space(inode, data_reserved, block_start,
5021 btrfs_delalloc_release_extents(BTRFS_I(inode), blocksize);
5025 extent_changeset_free(data_reserved);
5029 static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode,
5030 u64 offset, u64 len)
5032 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5033 struct btrfs_trans_handle *trans;
5037 * Still need to make sure the inode looks like it's been updated so
5038 * that any holes get logged if we fsync.
5040 if (btrfs_fs_incompat(fs_info, NO_HOLES)) {
5041 BTRFS_I(inode)->last_trans = fs_info->generation;
5042 BTRFS_I(inode)->last_sub_trans = root->log_transid;
5043 BTRFS_I(inode)->last_log_commit = root->last_log_commit;
5048 * 1 - for the one we're dropping
5049 * 1 - for the one we're adding
5050 * 1 - for updating the inode.
5052 trans = btrfs_start_transaction(root, 3);
5054 return PTR_ERR(trans);
5056 ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1);
5058 btrfs_abort_transaction(trans, ret);
5059 btrfs_end_transaction(trans);
5063 ret = btrfs_insert_file_extent(trans, root, btrfs_ino(BTRFS_I(inode)),
5064 offset, 0, 0, len, 0, len, 0, 0, 0);
5066 btrfs_abort_transaction(trans, ret);
5068 btrfs_update_inode(trans, root, inode);
5069 btrfs_end_transaction(trans);
5074 * This function puts in dummy file extents for the area we're creating a hole
5075 * for. So if we are truncating this file to a larger size we need to insert
5076 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
5077 * the range between oldsize and size
5079 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
5081 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5082 struct btrfs_root *root = BTRFS_I(inode)->root;
5083 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
5084 struct extent_map *em = NULL;
5085 struct extent_state *cached_state = NULL;
5086 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
5087 u64 hole_start = ALIGN(oldsize, fs_info->sectorsize);
5088 u64 block_end = ALIGN(size, fs_info->sectorsize);
5095 * If our size started in the middle of a block we need to zero out the
5096 * rest of the block before we expand the i_size, otherwise we could
5097 * expose stale data.
5099 err = btrfs_truncate_block(inode, oldsize, 0, 0);
5103 if (size <= hole_start)
5106 btrfs_lock_and_flush_ordered_range(io_tree, BTRFS_I(inode), hole_start,
5107 block_end - 1, &cached_state);
5108 cur_offset = hole_start;
5110 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, cur_offset,
5111 block_end - cur_offset, 0);
5117 last_byte = min(extent_map_end(em), block_end);
5118 last_byte = ALIGN(last_byte, fs_info->sectorsize);
5119 if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
5120 struct extent_map *hole_em;
5121 hole_size = last_byte - cur_offset;
5123 err = maybe_insert_hole(root, inode, cur_offset,
5127 btrfs_drop_extent_cache(BTRFS_I(inode), cur_offset,
5128 cur_offset + hole_size - 1, 0);
5129 hole_em = alloc_extent_map();
5131 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
5132 &BTRFS_I(inode)->runtime_flags);
5135 hole_em->start = cur_offset;
5136 hole_em->len = hole_size;
5137 hole_em->orig_start = cur_offset;
5139 hole_em->block_start = EXTENT_MAP_HOLE;
5140 hole_em->block_len = 0;
5141 hole_em->orig_block_len = 0;
5142 hole_em->ram_bytes = hole_size;
5143 hole_em->bdev = fs_info->fs_devices->latest_bdev;
5144 hole_em->compress_type = BTRFS_COMPRESS_NONE;
5145 hole_em->generation = fs_info->generation;
5148 write_lock(&em_tree->lock);
5149 err = add_extent_mapping(em_tree, hole_em, 1);
5150 write_unlock(&em_tree->lock);
5153 btrfs_drop_extent_cache(BTRFS_I(inode),
5158 free_extent_map(hole_em);
5161 free_extent_map(em);
5163 cur_offset = last_byte;
5164 if (cur_offset >= block_end)
5167 free_extent_map(em);
5168 unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state);
5172 static int btrfs_setsize(struct inode *inode, struct iattr *attr)
5174 struct btrfs_root *root = BTRFS_I(inode)->root;
5175 struct btrfs_trans_handle *trans;
5176 loff_t oldsize = i_size_read(inode);
5177 loff_t newsize = attr->ia_size;
5178 int mask = attr->ia_valid;
5182 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
5183 * special case where we need to update the times despite not having
5184 * these flags set. For all other operations the VFS set these flags
5185 * explicitly if it wants a timestamp update.
5187 if (newsize != oldsize) {
5188 inode_inc_iversion(inode);
5189 if (!(mask & (ATTR_CTIME | ATTR_MTIME)))
5190 inode->i_ctime = inode->i_mtime =
5191 current_time(inode);
5194 if (newsize > oldsize) {
5196 * Don't do an expanding truncate while snapshotting is ongoing.
5197 * This is to ensure the snapshot captures a fully consistent
5198 * state of this file - if the snapshot captures this expanding
5199 * truncation, it must capture all writes that happened before
5202 btrfs_wait_for_snapshot_creation(root);
5203 ret = btrfs_cont_expand(inode, oldsize, newsize);
5205 btrfs_end_write_no_snapshotting(root);
5209 trans = btrfs_start_transaction(root, 1);
5210 if (IS_ERR(trans)) {
5211 btrfs_end_write_no_snapshotting(root);
5212 return PTR_ERR(trans);
5215 i_size_write(inode, newsize);
5216 btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
5217 pagecache_isize_extended(inode, oldsize, newsize);
5218 ret = btrfs_update_inode(trans, root, inode);
5219 btrfs_end_write_no_snapshotting(root);
5220 btrfs_end_transaction(trans);
5224 * We're truncating a file that used to have good data down to
5225 * zero. Make sure it gets into the ordered flush list so that
5226 * any new writes get down to disk quickly.
5229 set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE,
5230 &BTRFS_I(inode)->runtime_flags);
5232 truncate_setsize(inode, newsize);
5234 /* Disable nonlocked read DIO to avoid the endless truncate */
5235 btrfs_inode_block_unlocked_dio(BTRFS_I(inode));
5236 inode_dio_wait(inode);
5237 btrfs_inode_resume_unlocked_dio(BTRFS_I(inode));
5239 ret = btrfs_truncate(inode, newsize == oldsize);
5240 if (ret && inode->i_nlink) {
5244 * Truncate failed, so fix up the in-memory size. We
5245 * adjusted disk_i_size down as we removed extents, so
5246 * wait for disk_i_size to be stable and then update the
5247 * in-memory size to match.
5249 err = btrfs_wait_ordered_range(inode, 0, (u64)-1);
5252 i_size_write(inode, BTRFS_I(inode)->disk_i_size);
5259 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
5261 struct inode *inode = d_inode(dentry);
5262 struct btrfs_root *root = BTRFS_I(inode)->root;
5265 if (btrfs_root_readonly(root))
5268 err = setattr_prepare(dentry, attr);
5272 if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
5273 err = btrfs_setsize(inode, attr);
5278 if (attr->ia_valid) {
5279 setattr_copy(inode, attr);
5280 inode_inc_iversion(inode);
5281 err = btrfs_dirty_inode(inode);
5283 if (!err && attr->ia_valid & ATTR_MODE)
5284 err = posix_acl_chmod(inode, inode->i_mode);
5291 * While truncating the inode pages during eviction, we get the VFS calling
5292 * btrfs_invalidatepage() against each page of the inode. This is slow because
5293 * the calls to btrfs_invalidatepage() result in a huge amount of calls to
5294 * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
5295 * extent_state structures over and over, wasting lots of time.
5297 * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
5298 * those expensive operations on a per page basis and do only the ordered io
5299 * finishing, while we release here the extent_map and extent_state structures,
5300 * without the excessive merging and splitting.
5302 static void evict_inode_truncate_pages(struct inode *inode)
5304 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
5305 struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree;
5306 struct rb_node *node;
5308 ASSERT(inode->i_state & I_FREEING);
5309 truncate_inode_pages_final(&inode->i_data);
5311 write_lock(&map_tree->lock);
5312 while (!RB_EMPTY_ROOT(&map_tree->map.rb_root)) {
5313 struct extent_map *em;
5315 node = rb_first_cached(&map_tree->map);
5316 em = rb_entry(node, struct extent_map, rb_node);
5317 clear_bit(EXTENT_FLAG_PINNED, &em->flags);
5318 clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
5319 remove_extent_mapping(map_tree, em);
5320 free_extent_map(em);
5321 if (need_resched()) {
5322 write_unlock(&map_tree->lock);
5324 write_lock(&map_tree->lock);
5327 write_unlock(&map_tree->lock);
5330 * Keep looping until we have no more ranges in the io tree.
5331 * We can have ongoing bios started by readpages (called from readahead)
5332 * that have their endio callback (extent_io.c:end_bio_extent_readpage)
5333 * still in progress (unlocked the pages in the bio but did not yet
5334 * unlocked the ranges in the io tree). Therefore this means some
5335 * ranges can still be locked and eviction started because before
5336 * submitting those bios, which are executed by a separate task (work
5337 * queue kthread), inode references (inode->i_count) were not taken
5338 * (which would be dropped in the end io callback of each bio).
5339 * Therefore here we effectively end up waiting for those bios and
5340 * anyone else holding locked ranges without having bumped the inode's
5341 * reference count - if we don't do it, when they access the inode's
5342 * io_tree to unlock a range it may be too late, leading to an
5343 * use-after-free issue.
5345 spin_lock(&io_tree->lock);
5346 while (!RB_EMPTY_ROOT(&io_tree->state)) {
5347 struct extent_state *state;
5348 struct extent_state *cached_state = NULL;
5351 unsigned state_flags;
5353 node = rb_first(&io_tree->state);
5354 state = rb_entry(node, struct extent_state, rb_node);
5355 start = state->start;
5357 state_flags = state->state;
5358 spin_unlock(&io_tree->lock);
5360 lock_extent_bits(io_tree, start, end, &cached_state);
5363 * If still has DELALLOC flag, the extent didn't reach disk,
5364 * and its reserved space won't be freed by delayed_ref.
5365 * So we need to free its reserved space here.
5366 * (Refer to comment in btrfs_invalidatepage, case 2)
5368 * Note, end is the bytenr of last byte, so we need + 1 here.
5370 if (state_flags & EXTENT_DELALLOC)
5371 btrfs_qgroup_free_data(inode, NULL, start, end - start + 1);
5373 clear_extent_bit(io_tree, start, end,
5374 EXTENT_LOCKED | EXTENT_DELALLOC |
5375 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 1, 1,
5379 spin_lock(&io_tree->lock);
5381 spin_unlock(&io_tree->lock);
5384 static struct btrfs_trans_handle *evict_refill_and_join(struct btrfs_root *root,
5385 struct btrfs_block_rsv *rsv)
5387 struct btrfs_fs_info *fs_info = root->fs_info;
5388 struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
5389 struct btrfs_trans_handle *trans;
5390 u64 delayed_refs_extra = btrfs_calc_insert_metadata_size(fs_info, 1);
5394 * Eviction should be taking place at some place safe because of our
5395 * delayed iputs. However the normal flushing code will run delayed
5396 * iputs, so we cannot use FLUSH_ALL otherwise we'll deadlock.
5398 * We reserve the delayed_refs_extra here again because we can't use
5399 * btrfs_start_transaction(root, 0) for the same deadlocky reason as
5400 * above. We reserve our extra bit here because we generate a ton of
5401 * delayed refs activity by truncating.
5403 * If we cannot make our reservation we'll attempt to steal from the
5404 * global reserve, because we really want to be able to free up space.
5406 ret = btrfs_block_rsv_refill(root, rsv, rsv->size + delayed_refs_extra,
5407 BTRFS_RESERVE_FLUSH_EVICT);
5410 * Try to steal from the global reserve if there is space for
5413 if (btrfs_check_space_for_delayed_refs(fs_info) ||
5414 btrfs_block_rsv_migrate(global_rsv, rsv, rsv->size, 0)) {
5416 "could not allocate space for delete; will truncate on mount");
5417 return ERR_PTR(-ENOSPC);
5419 delayed_refs_extra = 0;
5422 trans = btrfs_join_transaction(root);
5426 if (delayed_refs_extra) {
5427 trans->block_rsv = &fs_info->trans_block_rsv;
5428 trans->bytes_reserved = delayed_refs_extra;
5429 btrfs_block_rsv_migrate(rsv, trans->block_rsv,
5430 delayed_refs_extra, 1);
5435 void btrfs_evict_inode(struct inode *inode)
5437 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5438 struct btrfs_trans_handle *trans;
5439 struct btrfs_root *root = BTRFS_I(inode)->root;
5440 struct btrfs_block_rsv *rsv;
5443 trace_btrfs_inode_evict(inode);
5450 evict_inode_truncate_pages(inode);
5452 if (inode->i_nlink &&
5453 ((btrfs_root_refs(&root->root_item) != 0 &&
5454 root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) ||
5455 btrfs_is_free_space_inode(BTRFS_I(inode))))
5458 if (is_bad_inode(inode))
5461 btrfs_free_io_failure_record(BTRFS_I(inode), 0, (u64)-1);
5463 if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
5466 if (inode->i_nlink > 0) {
5467 BUG_ON(btrfs_root_refs(&root->root_item) != 0 &&
5468 root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID);
5472 ret = btrfs_commit_inode_delayed_inode(BTRFS_I(inode));
5476 rsv = btrfs_alloc_block_rsv(fs_info, BTRFS_BLOCK_RSV_TEMP);
5479 rsv->size = btrfs_calc_metadata_size(fs_info, 1);
5482 btrfs_i_size_write(BTRFS_I(inode), 0);
5485 trans = evict_refill_and_join(root, rsv);
5489 trans->block_rsv = rsv;
5491 ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
5492 trans->block_rsv = &fs_info->trans_block_rsv;
5493 btrfs_end_transaction(trans);
5494 btrfs_btree_balance_dirty(fs_info);
5495 if (ret && ret != -ENOSPC && ret != -EAGAIN)
5502 * Errors here aren't a big deal, it just means we leave orphan items in
5503 * the tree. They will be cleaned up on the next mount. If the inode
5504 * number gets reused, cleanup deletes the orphan item without doing
5505 * anything, and unlink reuses the existing orphan item.
5507 * If it turns out that we are dropping too many of these, we might want
5508 * to add a mechanism for retrying these after a commit.
5510 trans = evict_refill_and_join(root, rsv);
5511 if (!IS_ERR(trans)) {
5512 trans->block_rsv = rsv;
5513 btrfs_orphan_del(trans, BTRFS_I(inode));
5514 trans->block_rsv = &fs_info->trans_block_rsv;
5515 btrfs_end_transaction(trans);
5518 if (!(root == fs_info->tree_root ||
5519 root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID))
5520 btrfs_return_ino(root, btrfs_ino(BTRFS_I(inode)));
5523 btrfs_free_block_rsv(fs_info, rsv);
5526 * If we didn't successfully delete, the orphan item will still be in
5527 * the tree and we'll retry on the next mount. Again, we might also want
5528 * to retry these periodically in the future.
5530 btrfs_remove_delayed_node(BTRFS_I(inode));
5535 * Return the key found in the dir entry in the location pointer, fill @type
5536 * with BTRFS_FT_*, and return 0.
5538 * If no dir entries were found, returns -ENOENT.
5539 * If found a corrupted location in dir entry, returns -EUCLEAN.
5541 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
5542 struct btrfs_key *location, u8 *type)
5544 const char *name = dentry->d_name.name;
5545 int namelen = dentry->d_name.len;
5546 struct btrfs_dir_item *di;
5547 struct btrfs_path *path;
5548 struct btrfs_root *root = BTRFS_I(dir)->root;
5551 path = btrfs_alloc_path();
5555 di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(BTRFS_I(dir)),
5557 if (IS_ERR_OR_NULL(di)) {
5558 ret = di ? PTR_ERR(di) : -ENOENT;
5562 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
5563 if (location->type != BTRFS_INODE_ITEM_KEY &&
5564 location->type != BTRFS_ROOT_ITEM_KEY) {
5566 btrfs_warn(root->fs_info,
5567 "%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))",
5568 __func__, name, btrfs_ino(BTRFS_I(dir)),
5569 location->objectid, location->type, location->offset);
5572 *type = btrfs_dir_type(path->nodes[0], di);
5574 btrfs_free_path(path);
5579 * when we hit a tree root in a directory, the btrfs part of the inode
5580 * needs to be changed to reflect the root directory of the tree root. This
5581 * is kind of like crossing a mount point.
5583 static int fixup_tree_root_location(struct btrfs_fs_info *fs_info,
5585 struct dentry *dentry,
5586 struct btrfs_key *location,
5587 struct btrfs_root **sub_root)
5589 struct btrfs_path *path;
5590 struct btrfs_root *new_root;
5591 struct btrfs_root_ref *ref;
5592 struct extent_buffer *leaf;
5593 struct btrfs_key key;
5597 path = btrfs_alloc_path();
5604 key.objectid = BTRFS_I(dir)->root->root_key.objectid;
5605 key.type = BTRFS_ROOT_REF_KEY;
5606 key.offset = location->objectid;
5608 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
5615 leaf = path->nodes[0];
5616 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
5617 if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(BTRFS_I(dir)) ||
5618 btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len)
5621 ret = memcmp_extent_buffer(leaf, dentry->d_name.name,
5622 (unsigned long)(ref + 1),
5623 dentry->d_name.len);
5627 btrfs_release_path(path);
5629 new_root = btrfs_read_fs_root_no_name(fs_info, location);
5630 if (IS_ERR(new_root)) {
5631 err = PTR_ERR(new_root);
5635 *sub_root = new_root;
5636 location->objectid = btrfs_root_dirid(&new_root->root_item);
5637 location->type = BTRFS_INODE_ITEM_KEY;
5638 location->offset = 0;
5641 btrfs_free_path(path);
5645 static void inode_tree_add(struct inode *inode)
5647 struct btrfs_root *root = BTRFS_I(inode)->root;
5648 struct btrfs_inode *entry;
5650 struct rb_node *parent;
5651 struct rb_node *new = &BTRFS_I(inode)->rb_node;
5652 u64 ino = btrfs_ino(BTRFS_I(inode));
5654 if (inode_unhashed(inode))
5657 spin_lock(&root->inode_lock);
5658 p = &root->inode_tree.rb_node;
5661 entry = rb_entry(parent, struct btrfs_inode, rb_node);
5663 if (ino < btrfs_ino(entry))
5664 p = &parent->rb_left;
5665 else if (ino > btrfs_ino(entry))
5666 p = &parent->rb_right;
5668 WARN_ON(!(entry->vfs_inode.i_state &
5669 (I_WILL_FREE | I_FREEING)));
5670 rb_replace_node(parent, new, &root->inode_tree);
5671 RB_CLEAR_NODE(parent);
5672 spin_unlock(&root->inode_lock);
5676 rb_link_node(new, parent, p);
5677 rb_insert_color(new, &root->inode_tree);
5678 spin_unlock(&root->inode_lock);
5681 static void inode_tree_del(struct inode *inode)
5683 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5684 struct btrfs_root *root = BTRFS_I(inode)->root;
5687 spin_lock(&root->inode_lock);
5688 if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
5689 rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree);
5690 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
5691 empty = RB_EMPTY_ROOT(&root->inode_tree);
5693 spin_unlock(&root->inode_lock);
5695 if (empty && btrfs_root_refs(&root->root_item) == 0) {
5696 synchronize_srcu(&fs_info->subvol_srcu);
5697 spin_lock(&root->inode_lock);
5698 empty = RB_EMPTY_ROOT(&root->inode_tree);
5699 spin_unlock(&root->inode_lock);
5701 btrfs_add_dead_root(root);
5706 static int btrfs_init_locked_inode(struct inode *inode, void *p)
5708 struct btrfs_iget_args *args = p;
5709 inode->i_ino = args->location->objectid;
5710 memcpy(&BTRFS_I(inode)->location, args->location,
5711 sizeof(*args->location));
5712 BTRFS_I(inode)->root = args->root;
5716 static int btrfs_find_actor(struct inode *inode, void *opaque)
5718 struct btrfs_iget_args *args = opaque;
5719 return args->location->objectid == BTRFS_I(inode)->location.objectid &&
5720 args->root == BTRFS_I(inode)->root;
5723 static struct inode *btrfs_iget_locked(struct super_block *s,
5724 struct btrfs_key *location,
5725 struct btrfs_root *root)
5727 struct inode *inode;
5728 struct btrfs_iget_args args;
5729 unsigned long hashval = btrfs_inode_hash(location->objectid, root);
5731 args.location = location;
5734 inode = iget5_locked(s, hashval, btrfs_find_actor,
5735 btrfs_init_locked_inode,
5740 /* Get an inode object given its location and corresponding root.
5741 * Returns in *is_new if the inode was read from disk
5743 struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
5744 struct btrfs_root *root, int *new,
5745 struct btrfs_path *path)
5747 struct inode *inode;
5749 inode = btrfs_iget_locked(s, location, root);
5751 return ERR_PTR(-ENOMEM);
5753 if (inode->i_state & I_NEW) {
5756 ret = btrfs_read_locked_inode(inode, path);
5758 inode_tree_add(inode);
5759 unlock_new_inode(inode);
5765 * ret > 0 can come from btrfs_search_slot called by
5766 * btrfs_read_locked_inode, this means the inode item
5771 inode = ERR_PTR(ret);
5778 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
5779 struct btrfs_root *root, int *new)
5781 return btrfs_iget_path(s, location, root, new, NULL);
5784 static struct inode *new_simple_dir(struct super_block *s,
5785 struct btrfs_key *key,
5786 struct btrfs_root *root)
5788 struct inode *inode = new_inode(s);
5791 return ERR_PTR(-ENOMEM);
5793 BTRFS_I(inode)->root = root;
5794 memcpy(&BTRFS_I(inode)->location, key, sizeof(*key));
5795 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
5797 inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
5798 inode->i_op = &btrfs_dir_ro_inode_operations;
5799 inode->i_opflags &= ~IOP_XATTR;
5800 inode->i_fop = &simple_dir_operations;
5801 inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
5802 inode->i_mtime = current_time(inode);
5803 inode->i_atime = inode->i_mtime;
5804 inode->i_ctime = inode->i_mtime;
5805 BTRFS_I(inode)->i_otime = inode->i_mtime;
5810 static inline u8 btrfs_inode_type(struct inode *inode)
5813 * Compile-time asserts that generic FT_* types still match
5816 BUILD_BUG_ON(BTRFS_FT_UNKNOWN != FT_UNKNOWN);
5817 BUILD_BUG_ON(BTRFS_FT_REG_FILE != FT_REG_FILE);
5818 BUILD_BUG_ON(BTRFS_FT_DIR != FT_DIR);
5819 BUILD_BUG_ON(BTRFS_FT_CHRDEV != FT_CHRDEV);
5820 BUILD_BUG_ON(BTRFS_FT_BLKDEV != FT_BLKDEV);
5821 BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO);
5822 BUILD_BUG_ON(BTRFS_FT_SOCK != FT_SOCK);
5823 BUILD_BUG_ON(BTRFS_FT_SYMLINK != FT_SYMLINK);
5825 return fs_umode_to_ftype(inode->i_mode);
5828 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
5830 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
5831 struct inode *inode;
5832 struct btrfs_root *root = BTRFS_I(dir)->root;
5833 struct btrfs_root *sub_root = root;
5834 struct btrfs_key location;
5839 if (dentry->d_name.len > BTRFS_NAME_LEN)
5840 return ERR_PTR(-ENAMETOOLONG);
5842 ret = btrfs_inode_by_name(dir, dentry, &location, &di_type);
5844 return ERR_PTR(ret);
5846 if (location.type == BTRFS_INODE_ITEM_KEY) {
5847 inode = btrfs_iget(dir->i_sb, &location, root, NULL);
5851 /* Do extra check against inode mode with di_type */
5852 if (btrfs_inode_type(inode) != di_type) {
5854 "inode mode mismatch with dir: inode mode=0%o btrfs type=%u dir type=%u",
5855 inode->i_mode, btrfs_inode_type(inode),
5858 return ERR_PTR(-EUCLEAN);
5863 index = srcu_read_lock(&fs_info->subvol_srcu);
5864 ret = fixup_tree_root_location(fs_info, dir, dentry,
5865 &location, &sub_root);
5868 inode = ERR_PTR(ret);
5870 inode = new_simple_dir(dir->i_sb, &location, sub_root);
5872 inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL);
5874 srcu_read_unlock(&fs_info->subvol_srcu, index);
5876 if (!IS_ERR(inode) && root != sub_root) {
5877 down_read(&fs_info->cleanup_work_sem);
5878 if (!sb_rdonly(inode->i_sb))
5879 ret = btrfs_orphan_cleanup(sub_root);
5880 up_read(&fs_info->cleanup_work_sem);
5883 inode = ERR_PTR(ret);
5890 static int btrfs_dentry_delete(const struct dentry *dentry)
5892 struct btrfs_root *root;
5893 struct inode *inode = d_inode(dentry);
5895 if (!inode && !IS_ROOT(dentry))
5896 inode = d_inode(dentry->d_parent);
5899 root = BTRFS_I(inode)->root;
5900 if (btrfs_root_refs(&root->root_item) == 0)
5903 if (btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
5909 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
5912 struct inode *inode = btrfs_lookup_dentry(dir, dentry);
5914 if (inode == ERR_PTR(-ENOENT))
5916 return d_splice_alias(inode, dentry);
5920 * All this infrastructure exists because dir_emit can fault, and we are holding
5921 * the tree lock when doing readdir. For now just allocate a buffer and copy
5922 * our information into that, and then dir_emit from the buffer. This is
5923 * similar to what NFS does, only we don't keep the buffer around in pagecache
5924 * because I'm afraid I'll mess that up. Long term we need to make filldir do
5925 * copy_to_user_inatomic so we don't have to worry about page faulting under the
5928 static int btrfs_opendir(struct inode *inode, struct file *file)
5930 struct btrfs_file_private *private;
5932 private = kzalloc(sizeof(struct btrfs_file_private), GFP_KERNEL);
5935 private->filldir_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
5936 if (!private->filldir_buf) {
5940 file->private_data = private;
5951 static int btrfs_filldir(void *addr, int entries, struct dir_context *ctx)
5954 struct dir_entry *entry = addr;
5955 char *name = (char *)(entry + 1);
5957 ctx->pos = get_unaligned(&entry->offset);
5958 if (!dir_emit(ctx, name, get_unaligned(&entry->name_len),
5959 get_unaligned(&entry->ino),
5960 get_unaligned(&entry->type)))
5962 addr += sizeof(struct dir_entry) +
5963 get_unaligned(&entry->name_len);
5969 static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
5971 struct inode *inode = file_inode(file);
5972 struct btrfs_root *root = BTRFS_I(inode)->root;
5973 struct btrfs_file_private *private = file->private_data;
5974 struct btrfs_dir_item *di;
5975 struct btrfs_key key;
5976 struct btrfs_key found_key;
5977 struct btrfs_path *path;
5979 struct list_head ins_list;
5980 struct list_head del_list;
5982 struct extent_buffer *leaf;
5989 struct btrfs_key location;
5991 if (!dir_emit_dots(file, ctx))
5994 path = btrfs_alloc_path();
5998 addr = private->filldir_buf;
5999 path->reada = READA_FORWARD;
6001 INIT_LIST_HEAD(&ins_list);
6002 INIT_LIST_HEAD(&del_list);
6003 put = btrfs_readdir_get_delayed_items(inode, &ins_list, &del_list);
6006 key.type = BTRFS_DIR_INDEX_KEY;
6007 key.offset = ctx->pos;
6008 key.objectid = btrfs_ino(BTRFS_I(inode));
6010 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
6015 struct dir_entry *entry;
6017 leaf = path->nodes[0];
6018 slot = path->slots[0];
6019 if (slot >= btrfs_header_nritems(leaf)) {
6020 ret = btrfs_next_leaf(root, path);
6028 btrfs_item_key_to_cpu(leaf, &found_key, slot);
6030 if (found_key.objectid != key.objectid)
6032 if (found_key.type != BTRFS_DIR_INDEX_KEY)
6034 if (found_key.offset < ctx->pos)
6036 if (btrfs_should_delete_dir_index(&del_list, found_key.offset))
6038 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
6039 name_len = btrfs_dir_name_len(leaf, di);
6040 if ((total_len + sizeof(struct dir_entry) + name_len) >=
6042 btrfs_release_path(path);
6043 ret = btrfs_filldir(private->filldir_buf, entries, ctx);
6046 addr = private->filldir_buf;
6053 put_unaligned(name_len, &entry->name_len);
6054 name_ptr = (char *)(entry + 1);
6055 read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
6057 put_unaligned(fs_ftype_to_dtype(btrfs_dir_type(leaf, di)),
6059 btrfs_dir_item_key_to_cpu(leaf, di, &location);
6060 put_unaligned(location.objectid, &entry->ino);
6061 put_unaligned(found_key.offset, &entry->offset);
6063 addr += sizeof(struct dir_entry) + name_len;
6064 total_len += sizeof(struct dir_entry) + name_len;
6068 btrfs_release_path(path);
6070 ret = btrfs_filldir(private->filldir_buf, entries, ctx);
6074 ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list);
6079 * Stop new entries from being returned after we return the last
6082 * New directory entries are assigned a strictly increasing
6083 * offset. This means that new entries created during readdir
6084 * are *guaranteed* to be seen in the future by that readdir.
6085 * This has broken buggy programs which operate on names as
6086 * they're returned by readdir. Until we re-use freed offsets
6087 * we have this hack to stop new entries from being returned
6088 * under the assumption that they'll never reach this huge
6091 * This is being careful not to overflow 32bit loff_t unless the
6092 * last entry requires it because doing so has broken 32bit apps
6095 if (ctx->pos >= INT_MAX)
6096 ctx->pos = LLONG_MAX;
6103 btrfs_readdir_put_delayed_items(inode, &ins_list, &del_list);
6104 btrfs_free_path(path);
6109 * This is somewhat expensive, updating the tree every time the
6110 * inode changes. But, it is most likely to find the inode in cache.
6111 * FIXME, needs more benchmarking...there are no reasons other than performance
6112 * to keep or drop this code.
6114 static int btrfs_dirty_inode(struct inode *inode)
6116 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
6117 struct btrfs_root *root = BTRFS_I(inode)->root;
6118 struct btrfs_trans_handle *trans;
6121 if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags))
6124 trans = btrfs_join_transaction(root);
6126 return PTR_ERR(trans);
6128 ret = btrfs_update_inode(trans, root, inode);
6129 if (ret && ret == -ENOSPC) {
6130 /* whoops, lets try again with the full transaction */
6131 btrfs_end_transaction(trans);
6132 trans = btrfs_start_transaction(root, 1);
6134 return PTR_ERR(trans);
6136 ret = btrfs_update_inode(trans, root, inode);
6138 btrfs_end_transaction(trans);
6139 if (BTRFS_I(inode)->delayed_node)
6140 btrfs_balance_delayed_items(fs_info);
6146 * This is a copy of file_update_time. We need this so we can return error on
6147 * ENOSPC for updating the inode in the case of file write and mmap writes.
6149 static int btrfs_update_time(struct inode *inode, struct timespec64 *now,
6152 struct btrfs_root *root = BTRFS_I(inode)->root;
6153 bool dirty = flags & ~S_VERSION;
6155 if (btrfs_root_readonly(root))
6158 if (flags & S_VERSION)
6159 dirty |= inode_maybe_inc_iversion(inode, dirty);
6160 if (flags & S_CTIME)
6161 inode->i_ctime = *now;
6162 if (flags & S_MTIME)
6163 inode->i_mtime = *now;
6164 if (flags & S_ATIME)
6165 inode->i_atime = *now;
6166 return dirty ? btrfs_dirty_inode(inode) : 0;
6170 * find the highest existing sequence number in a directory
6171 * and then set the in-memory index_cnt variable to reflect
6172 * free sequence numbers
6174 static int btrfs_set_inode_index_count(struct btrfs_inode *inode)
6176 struct btrfs_root *root = inode->root;
6177 struct btrfs_key key, found_key;
6178 struct btrfs_path *path;
6179 struct extent_buffer *leaf;
6182 key.objectid = btrfs_ino(inode);
6183 key.type = BTRFS_DIR_INDEX_KEY;
6184 key.offset = (u64)-1;
6186 path = btrfs_alloc_path();
6190 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
6193 /* FIXME: we should be able to handle this */
6199 * MAGIC NUMBER EXPLANATION:
6200 * since we search a directory based on f_pos we have to start at 2
6201 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
6202 * else has to start at 2
6204 if (path->slots[0] == 0) {
6205 inode->index_cnt = 2;
6211 leaf = path->nodes[0];
6212 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
6214 if (found_key.objectid != btrfs_ino(inode) ||
6215 found_key.type != BTRFS_DIR_INDEX_KEY) {
6216 inode->index_cnt = 2;
6220 inode->index_cnt = found_key.offset + 1;
6222 btrfs_free_path(path);
6227 * helper to find a free sequence number in a given directory. This current
6228 * code is very simple, later versions will do smarter things in the btree
6230 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index)
6234 if (dir->index_cnt == (u64)-1) {
6235 ret = btrfs_inode_delayed_dir_index_count(dir);
6237 ret = btrfs_set_inode_index_count(dir);
6243 *index = dir->index_cnt;
6249 static int btrfs_insert_inode_locked(struct inode *inode)
6251 struct btrfs_iget_args args;
6252 args.location = &BTRFS_I(inode)->location;
6253 args.root = BTRFS_I(inode)->root;
6255 return insert_inode_locked4(inode,
6256 btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root),
6257 btrfs_find_actor, &args);
6261 * Inherit flags from the parent inode.
6263 * Currently only the compression flags and the cow flags are inherited.
6265 static void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
6272 flags = BTRFS_I(dir)->flags;
6274 if (flags & BTRFS_INODE_NOCOMPRESS) {
6275 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
6276 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
6277 } else if (flags & BTRFS_INODE_COMPRESS) {
6278 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
6279 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
6282 if (flags & BTRFS_INODE_NODATACOW) {
6283 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
6284 if (S_ISREG(inode->i_mode))
6285 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
6288 btrfs_sync_inode_flags_to_i_flags(inode);
6291 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
6292 struct btrfs_root *root,
6294 const char *name, int name_len,
6295 u64 ref_objectid, u64 objectid,
6296 umode_t mode, u64 *index)
6298 struct btrfs_fs_info *fs_info = root->fs_info;
6299 struct inode *inode;
6300 struct btrfs_inode_item *inode_item;
6301 struct btrfs_key *location;
6302 struct btrfs_path *path;
6303 struct btrfs_inode_ref *ref;
6304 struct btrfs_key key[2];
6306 int nitems = name ? 2 : 1;
6308 unsigned int nofs_flag;
6311 path = btrfs_alloc_path();
6313 return ERR_PTR(-ENOMEM);
6315 nofs_flag = memalloc_nofs_save();
6316 inode = new_inode(fs_info->sb);
6317 memalloc_nofs_restore(nofs_flag);
6319 btrfs_free_path(path);
6320 return ERR_PTR(-ENOMEM);
6324 * O_TMPFILE, set link count to 0, so that after this point,
6325 * we fill in an inode item with the correct link count.
6328 set_nlink(inode, 0);
6331 * we have to initialize this early, so we can reclaim the inode
6332 * number if we fail afterwards in this function.
6334 inode->i_ino = objectid;
6337 trace_btrfs_inode_request(dir);
6339 ret = btrfs_set_inode_index(BTRFS_I(dir), index);
6341 btrfs_free_path(path);
6343 return ERR_PTR(ret);
6349 * index_cnt is ignored for everything but a dir,
6350 * btrfs_set_inode_index_count has an explanation for the magic
6353 BTRFS_I(inode)->index_cnt = 2;
6354 BTRFS_I(inode)->dir_index = *index;
6355 BTRFS_I(inode)->root = root;
6356 BTRFS_I(inode)->generation = trans->transid;
6357 inode->i_generation = BTRFS_I(inode)->generation;
6360 * We could have gotten an inode number from somebody who was fsynced
6361 * and then removed in this same transaction, so let's just set full
6362 * sync since it will be a full sync anyway and this will blow away the
6363 * old info in the log.
6365 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
6367 key[0].objectid = objectid;
6368 key[0].type = BTRFS_INODE_ITEM_KEY;
6371 sizes[0] = sizeof(struct btrfs_inode_item);
6375 * Start new inodes with an inode_ref. This is slightly more
6376 * efficient for small numbers of hard links since they will
6377 * be packed into one item. Extended refs will kick in if we
6378 * add more hard links than can fit in the ref item.
6380 key[1].objectid = objectid;
6381 key[1].type = BTRFS_INODE_REF_KEY;
6382 key[1].offset = ref_objectid;
6384 sizes[1] = name_len + sizeof(*ref);
6387 location = &BTRFS_I(inode)->location;
6388 location->objectid = objectid;
6389 location->offset = 0;
6390 location->type = BTRFS_INODE_ITEM_KEY;
6392 ret = btrfs_insert_inode_locked(inode);
6398 path->leave_spinning = 1;
6399 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems);
6403 inode_init_owner(inode, dir, mode);
6404 inode_set_bytes(inode, 0);
6406 inode->i_mtime = current_time(inode);
6407 inode->i_atime = inode->i_mtime;
6408 inode->i_ctime = inode->i_mtime;
6409 BTRFS_I(inode)->i_otime = inode->i_mtime;
6411 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
6412 struct btrfs_inode_item);
6413 memzero_extent_buffer(path->nodes[0], (unsigned long)inode_item,
6414 sizeof(*inode_item));
6415 fill_inode_item(trans, path->nodes[0], inode_item, inode);
6418 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
6419 struct btrfs_inode_ref);
6420 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
6421 btrfs_set_inode_ref_index(path->nodes[0], ref, *index);
6422 ptr = (unsigned long)(ref + 1);
6423 write_extent_buffer(path->nodes[0], name, ptr, name_len);
6426 btrfs_mark_buffer_dirty(path->nodes[0]);
6427 btrfs_free_path(path);
6429 btrfs_inherit_iflags(inode, dir);
6431 if (S_ISREG(mode)) {
6432 if (btrfs_test_opt(fs_info, NODATASUM))
6433 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
6434 if (btrfs_test_opt(fs_info, NODATACOW))
6435 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW |
6436 BTRFS_INODE_NODATASUM;
6439 inode_tree_add(inode);
6441 trace_btrfs_inode_new(inode);
6442 btrfs_set_inode_last_trans(trans, inode);
6444 btrfs_update_root_times(trans, root);
6446 ret = btrfs_inode_inherit_props(trans, inode, dir);
6449 "error inheriting props for ino %llu (root %llu): %d",
6450 btrfs_ino(BTRFS_I(inode)), root->root_key.objectid, ret);
6455 discard_new_inode(inode);
6458 BTRFS_I(dir)->index_cnt--;
6459 btrfs_free_path(path);
6460 return ERR_PTR(ret);
6464 * utility function to add 'inode' into 'parent_inode' with
6465 * a give name and a given sequence number.
6466 * if 'add_backref' is true, also insert a backref from the
6467 * inode to the parent directory.
6469 int btrfs_add_link(struct btrfs_trans_handle *trans,
6470 struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
6471 const char *name, int name_len, int add_backref, u64 index)
6474 struct btrfs_key key;
6475 struct btrfs_root *root = parent_inode->root;
6476 u64 ino = btrfs_ino(inode);
6477 u64 parent_ino = btrfs_ino(parent_inode);
6479 if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
6480 memcpy(&key, &inode->root->root_key, sizeof(key));
6483 key.type = BTRFS_INODE_ITEM_KEY;
6487 if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
6488 ret = btrfs_add_root_ref(trans, key.objectid,
6489 root->root_key.objectid, parent_ino,
6490 index, name, name_len);
6491 } else if (add_backref) {
6492 ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino,
6496 /* Nothing to clean up yet */
6500 ret = btrfs_insert_dir_item(trans, name, name_len, parent_inode, &key,
6501 btrfs_inode_type(&inode->vfs_inode), index);
6502 if (ret == -EEXIST || ret == -EOVERFLOW)
6505 btrfs_abort_transaction(trans, ret);
6509 btrfs_i_size_write(parent_inode, parent_inode->vfs_inode.i_size +
6511 inode_inc_iversion(&parent_inode->vfs_inode);
6513 * If we are replaying a log tree, we do not want to update the mtime
6514 * and ctime of the parent directory with the current time, since the
6515 * log replay procedure is responsible for setting them to their correct
6516 * values (the ones it had when the fsync was done).
6518 if (!test_bit(BTRFS_FS_LOG_RECOVERING, &root->fs_info->flags)) {
6519 struct timespec64 now = current_time(&parent_inode->vfs_inode);
6521 parent_inode->vfs_inode.i_mtime = now;
6522 parent_inode->vfs_inode.i_ctime = now;
6524 ret = btrfs_update_inode(trans, root, &parent_inode->vfs_inode);
6526 btrfs_abort_transaction(trans, ret);
6530 if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
6533 err = btrfs_del_root_ref(trans, key.objectid,
6534 root->root_key.objectid, parent_ino,
6535 &local_index, name, name_len);
6537 btrfs_abort_transaction(trans, err);
6538 } else if (add_backref) {
6542 err = btrfs_del_inode_ref(trans, root, name, name_len,
6543 ino, parent_ino, &local_index);
6545 btrfs_abort_transaction(trans, err);
6548 /* Return the original error code */
6552 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
6553 struct btrfs_inode *dir, struct dentry *dentry,
6554 struct btrfs_inode *inode, int backref, u64 index)
6556 int err = btrfs_add_link(trans, dir, inode,
6557 dentry->d_name.name, dentry->d_name.len,
6564 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
6565 umode_t mode, dev_t rdev)
6567 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
6568 struct btrfs_trans_handle *trans;
6569 struct btrfs_root *root = BTRFS_I(dir)->root;
6570 struct inode *inode = NULL;
6576 * 2 for inode item and ref
6578 * 1 for xattr if selinux is on
6580 trans = btrfs_start_transaction(root, 5);
6582 return PTR_ERR(trans);
6584 err = btrfs_find_free_ino(root, &objectid);
6588 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
6589 dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
6591 if (IS_ERR(inode)) {
6592 err = PTR_ERR(inode);
6598 * If the active LSM wants to access the inode during
6599 * d_instantiate it needs these. Smack checks to see
6600 * if the filesystem supports xattrs by looking at the
6603 inode->i_op = &btrfs_special_inode_operations;
6604 init_special_inode(inode, inode->i_mode, rdev);
6606 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
6610 err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry, BTRFS_I(inode),
6615 btrfs_update_inode(trans, root, inode);
6616 d_instantiate_new(dentry, inode);
6619 btrfs_end_transaction(trans);
6620 btrfs_btree_balance_dirty(fs_info);
6622 inode_dec_link_count(inode);
6623 discard_new_inode(inode);
6628 static int btrfs_create(struct inode *dir, struct dentry *dentry,
6629 umode_t mode, bool excl)
6631 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
6632 struct btrfs_trans_handle *trans;
6633 struct btrfs_root *root = BTRFS_I(dir)->root;
6634 struct inode *inode = NULL;
6640 * 2 for inode item and ref
6642 * 1 for xattr if selinux is on
6644 trans = btrfs_start_transaction(root, 5);
6646 return PTR_ERR(trans);
6648 err = btrfs_find_free_ino(root, &objectid);
6652 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
6653 dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
6655 if (IS_ERR(inode)) {
6656 err = PTR_ERR(inode);
6661 * If the active LSM wants to access the inode during
6662 * d_instantiate it needs these. Smack checks to see
6663 * if the filesystem supports xattrs by looking at the
6666 inode->i_fop = &btrfs_file_operations;
6667 inode->i_op = &btrfs_file_inode_operations;
6668 inode->i_mapping->a_ops = &btrfs_aops;
6670 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
6674 err = btrfs_update_inode(trans, root, inode);
6678 err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry, BTRFS_I(inode),
6683 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
6684 d_instantiate_new(dentry, inode);
6687 btrfs_end_transaction(trans);
6689 inode_dec_link_count(inode);
6690 discard_new_inode(inode);
6692 btrfs_btree_balance_dirty(fs_info);
6696 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
6697 struct dentry *dentry)
6699 struct btrfs_trans_handle *trans = NULL;
6700 struct btrfs_root *root = BTRFS_I(dir)->root;
6701 struct inode *inode = d_inode(old_dentry);
6702 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
6707 /* do not allow sys_link's with other subvols of the same device */
6708 if (root->root_key.objectid != BTRFS_I(inode)->root->root_key.objectid)
6711 if (inode->i_nlink >= BTRFS_LINK_MAX)
6714 err = btrfs_set_inode_index(BTRFS_I(dir), &index);
6719 * 2 items for inode and inode ref
6720 * 2 items for dir items
6721 * 1 item for parent inode
6722 * 1 item for orphan item deletion if O_TMPFILE
6724 trans = btrfs_start_transaction(root, inode->i_nlink ? 5 : 6);
6725 if (IS_ERR(trans)) {
6726 err = PTR_ERR(trans);
6731 /* There are several dir indexes for this inode, clear the cache. */
6732 BTRFS_I(inode)->dir_index = 0ULL;
6734 inode_inc_iversion(inode);
6735 inode->i_ctime = current_time(inode);
6737 set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
6739 err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry, BTRFS_I(inode),
6745 struct dentry *parent = dentry->d_parent;
6748 err = btrfs_update_inode(trans, root, inode);
6751 if (inode->i_nlink == 1) {
6753 * If new hard link count is 1, it's a file created
6754 * with open(2) O_TMPFILE flag.
6756 err = btrfs_orphan_del(trans, BTRFS_I(inode));
6760 d_instantiate(dentry, inode);
6761 ret = btrfs_log_new_name(trans, BTRFS_I(inode), NULL, parent,
6763 if (ret == BTRFS_NEED_TRANS_COMMIT) {
6764 err = btrfs_commit_transaction(trans);
6771 btrfs_end_transaction(trans);
6773 inode_dec_link_count(inode);
6776 btrfs_btree_balance_dirty(fs_info);
6780 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
6782 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
6783 struct inode *inode = NULL;
6784 struct btrfs_trans_handle *trans;
6785 struct btrfs_root *root = BTRFS_I(dir)->root;
6791 * 2 items for inode and ref
6792 * 2 items for dir items
6793 * 1 for xattr if selinux is on
6795 trans = btrfs_start_transaction(root, 5);
6797 return PTR_ERR(trans);
6799 err = btrfs_find_free_ino(root, &objectid);
6803 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
6804 dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
6805 S_IFDIR | mode, &index);
6806 if (IS_ERR(inode)) {
6807 err = PTR_ERR(inode);
6812 /* these must be set before we unlock the inode */
6813 inode->i_op = &btrfs_dir_inode_operations;
6814 inode->i_fop = &btrfs_dir_file_operations;
6816 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
6820 btrfs_i_size_write(BTRFS_I(inode), 0);
6821 err = btrfs_update_inode(trans, root, inode);
6825 err = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode),
6826 dentry->d_name.name,
6827 dentry->d_name.len, 0, index);
6831 d_instantiate_new(dentry, inode);
6834 btrfs_end_transaction(trans);
6836 inode_dec_link_count(inode);
6837 discard_new_inode(inode);
6839 btrfs_btree_balance_dirty(fs_info);
6843 static noinline int uncompress_inline(struct btrfs_path *path,
6845 size_t pg_offset, u64 extent_offset,
6846 struct btrfs_file_extent_item *item)
6849 struct extent_buffer *leaf = path->nodes[0];
6852 unsigned long inline_size;
6856 WARN_ON(pg_offset != 0);
6857 compress_type = btrfs_file_extent_compression(leaf, item);
6858 max_size = btrfs_file_extent_ram_bytes(leaf, item);
6859 inline_size = btrfs_file_extent_inline_item_len(leaf,
6860 btrfs_item_nr(path->slots[0]));
6861 tmp = kmalloc(inline_size, GFP_NOFS);
6864 ptr = btrfs_file_extent_inline_start(item);
6866 read_extent_buffer(leaf, tmp, ptr, inline_size);
6868 max_size = min_t(unsigned long, PAGE_SIZE, max_size);
6869 ret = btrfs_decompress(compress_type, tmp, page,
6870 extent_offset, inline_size, max_size);
6873 * decompression code contains a memset to fill in any space between the end
6874 * of the uncompressed data and the end of max_size in case the decompressed
6875 * data ends up shorter than ram_bytes. That doesn't cover the hole between
6876 * the end of an inline extent and the beginning of the next block, so we
6877 * cover that region here.
6880 if (max_size + pg_offset < PAGE_SIZE) {
6881 char *map = kmap(page);
6882 memset(map + pg_offset + max_size, 0, PAGE_SIZE - max_size - pg_offset);
6890 * a bit scary, this does extent mapping from logical file offset to the disk.
6891 * the ugly parts come from merging extents from the disk with the in-ram
6892 * representation. This gets more complex because of the data=ordered code,
6893 * where the in-ram extents might be locked pending data=ordered completion.
6895 * This also copies inline extents directly into the page.
6897 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
6899 size_t pg_offset, u64 start, u64 len,
6902 struct btrfs_fs_info *fs_info = inode->root->fs_info;
6905 u64 extent_start = 0;
6907 u64 objectid = btrfs_ino(inode);
6908 int extent_type = -1;
6909 struct btrfs_path *path = NULL;
6910 struct btrfs_root *root = inode->root;
6911 struct btrfs_file_extent_item *item;
6912 struct extent_buffer *leaf;
6913 struct btrfs_key found_key;
6914 struct extent_map *em = NULL;
6915 struct extent_map_tree *em_tree = &inode->extent_tree;
6916 struct extent_io_tree *io_tree = &inode->io_tree;
6917 const bool new_inline = !page || create;
6919 read_lock(&em_tree->lock);
6920 em = lookup_extent_mapping(em_tree, start, len);
6922 em->bdev = fs_info->fs_devices->latest_bdev;
6923 read_unlock(&em_tree->lock);
6926 if (em->start > start || em->start + em->len <= start)
6927 free_extent_map(em);
6928 else if (em->block_start == EXTENT_MAP_INLINE && page)
6929 free_extent_map(em);
6933 em = alloc_extent_map();
6938 em->bdev = fs_info->fs_devices->latest_bdev;
6939 em->start = EXTENT_MAP_HOLE;
6940 em->orig_start = EXTENT_MAP_HOLE;
6942 em->block_len = (u64)-1;
6944 path = btrfs_alloc_path();
6950 /* Chances are we'll be called again, so go ahead and do readahead */
6951 path->reada = READA_FORWARD;
6954 * Unless we're going to uncompress the inline extent, no sleep would
6957 path->leave_spinning = 1;
6959 ret = btrfs_lookup_file_extent(NULL, root, path, objectid, start, 0);
6963 } else if (ret > 0) {
6964 if (path->slots[0] == 0)
6969 leaf = path->nodes[0];
6970 item = btrfs_item_ptr(leaf, path->slots[0],
6971 struct btrfs_file_extent_item);
6972 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
6973 if (found_key.objectid != objectid ||
6974 found_key.type != BTRFS_EXTENT_DATA_KEY) {
6976 * If we backup past the first extent we want to move forward
6977 * and see if there is an extent in front of us, otherwise we'll
6978 * say there is a hole for our whole search range which can
6985 extent_type = btrfs_file_extent_type(leaf, item);
6986 extent_start = found_key.offset;
6987 if (extent_type == BTRFS_FILE_EXTENT_REG ||
6988 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
6989 /* Only regular file could have regular/prealloc extent */
6990 if (!S_ISREG(inode->vfs_inode.i_mode)) {
6993 "regular/prealloc extent found for non-regular inode %llu",
6997 extent_end = extent_start +
6998 btrfs_file_extent_num_bytes(leaf, item);
7000 trace_btrfs_get_extent_show_fi_regular(inode, leaf, item,
7002 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
7005 size = btrfs_file_extent_ram_bytes(leaf, item);
7006 extent_end = ALIGN(extent_start + size,
7007 fs_info->sectorsize);
7009 trace_btrfs_get_extent_show_fi_inline(inode, leaf, item,
7014 if (start >= extent_end) {
7016 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
7017 ret = btrfs_next_leaf(root, path);
7021 } else if (ret > 0) {
7024 leaf = path->nodes[0];
7026 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
7027 if (found_key.objectid != objectid ||
7028 found_key.type != BTRFS_EXTENT_DATA_KEY)
7030 if (start + len <= found_key.offset)
7032 if (start > found_key.offset)
7035 /* New extent overlaps with existing one */
7037 em->orig_start = start;
7038 em->len = found_key.offset - start;
7039 em->block_start = EXTENT_MAP_HOLE;
7043 btrfs_extent_item_to_extent_map(inode, path, item,
7046 if (extent_type == BTRFS_FILE_EXTENT_REG ||
7047 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
7049 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
7053 size_t extent_offset;
7059 size = btrfs_file_extent_ram_bytes(leaf, item);
7060 extent_offset = page_offset(page) + pg_offset - extent_start;
7061 copy_size = min_t(u64, PAGE_SIZE - pg_offset,
7062 size - extent_offset);
7063 em->start = extent_start + extent_offset;
7064 em->len = ALIGN(copy_size, fs_info->sectorsize);
7065 em->orig_block_len = em->len;
7066 em->orig_start = em->start;
7067 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
7069 btrfs_set_path_blocking(path);
7070 if (!PageUptodate(page)) {
7071 if (btrfs_file_extent_compression(leaf, item) !=
7072 BTRFS_COMPRESS_NONE) {
7073 ret = uncompress_inline(path, page, pg_offset,
7074 extent_offset, item);
7081 read_extent_buffer(leaf, map + pg_offset, ptr,
7083 if (pg_offset + copy_size < PAGE_SIZE) {
7084 memset(map + pg_offset + copy_size, 0,
7085 PAGE_SIZE - pg_offset -
7090 flush_dcache_page(page);
7092 set_extent_uptodate(io_tree, em->start,
7093 extent_map_end(em) - 1, NULL, GFP_NOFS);
7098 em->orig_start = start;
7100 em->block_start = EXTENT_MAP_HOLE;
7102 btrfs_release_path(path);
7103 if (em->start > start || extent_map_end(em) <= start) {
7105 "bad extent! em: [%llu %llu] passed [%llu %llu]",
7106 em->start, em->len, start, len);
7112 write_lock(&em_tree->lock);
7113 err = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
7114 write_unlock(&em_tree->lock);
7116 btrfs_free_path(path);
7118 trace_btrfs_get_extent(root, inode, em);
7121 free_extent_map(em);
7122 return ERR_PTR(err);
7124 BUG_ON(!em); /* Error is always set */
7128 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
7131 struct extent_map *em;
7132 struct extent_map *hole_em = NULL;
7133 u64 delalloc_start = start;
7139 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
7143 * If our em maps to:
7145 * - a pre-alloc extent,
7146 * there might actually be delalloc bytes behind it.
7148 if (em->block_start != EXTENT_MAP_HOLE &&
7149 !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7154 /* check to see if we've wrapped (len == -1 or similar) */
7163 /* ok, we didn't find anything, lets look for delalloc */
7164 delalloc_len = count_range_bits(&inode->io_tree, &delalloc_start,
7165 end, len, EXTENT_DELALLOC, 1);
7166 delalloc_end = delalloc_start + delalloc_len;
7167 if (delalloc_end < delalloc_start)
7168 delalloc_end = (u64)-1;
7171 * We didn't find anything useful, return the original results from
7174 if (delalloc_start > end || delalloc_end <= start) {
7181 * Adjust the delalloc_start to make sure it doesn't go backwards from
7182 * the start they passed in
7184 delalloc_start = max(start, delalloc_start);
7185 delalloc_len = delalloc_end - delalloc_start;
7187 if (delalloc_len > 0) {
7190 const u64 hole_end = extent_map_end(hole_em);
7192 em = alloc_extent_map();
7201 * When btrfs_get_extent can't find anything it returns one
7204 * Make sure what it found really fits our range, and adjust to
7205 * make sure it is based on the start from the caller
7207 if (hole_end <= start || hole_em->start > end) {
7208 free_extent_map(hole_em);
7211 hole_start = max(hole_em->start, start);
7212 hole_len = hole_end - hole_start;
7215 if (hole_em && delalloc_start > hole_start) {
7217 * Our hole starts before our delalloc, so we have to
7218 * return just the parts of the hole that go until the
7221 em->len = min(hole_len, delalloc_start - hole_start);
7222 em->start = hole_start;
7223 em->orig_start = hole_start;
7225 * Don't adjust block start at all, it is fixed at
7228 em->block_start = hole_em->block_start;
7229 em->block_len = hole_len;
7230 if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags))
7231 set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
7234 * Hole is out of passed range or it starts after
7237 em->start = delalloc_start;
7238 em->len = delalloc_len;
7239 em->orig_start = delalloc_start;
7240 em->block_start = EXTENT_MAP_DELALLOC;
7241 em->block_len = delalloc_len;
7248 free_extent_map(hole_em);
7250 free_extent_map(em);
7251 return ERR_PTR(err);
7256 static struct extent_map *btrfs_create_dio_extent(struct inode *inode,
7259 const u64 orig_start,
7260 const u64 block_start,
7261 const u64 block_len,
7262 const u64 orig_block_len,
7263 const u64 ram_bytes,
7266 struct extent_map *em = NULL;
7269 if (type != BTRFS_ORDERED_NOCOW) {
7270 em = create_io_em(inode, start, len, orig_start,
7271 block_start, block_len, orig_block_len,
7273 BTRFS_COMPRESS_NONE, /* compress_type */
7278 ret = btrfs_add_ordered_extent_dio(inode, start, block_start,
7279 len, block_len, type);
7282 free_extent_map(em);
7283 btrfs_drop_extent_cache(BTRFS_I(inode), start,
7284 start + len - 1, 0);
7293 static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
7296 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
7297 struct btrfs_root *root = BTRFS_I(inode)->root;
7298 struct extent_map *em;
7299 struct btrfs_key ins;
7303 alloc_hint = get_extent_allocation_hint(inode, start, len);
7304 ret = btrfs_reserve_extent(root, len, len, fs_info->sectorsize,
7305 0, alloc_hint, &ins, 1, 1);
7307 return ERR_PTR(ret);
7309 em = btrfs_create_dio_extent(inode, start, ins.offset, start,
7310 ins.objectid, ins.offset, ins.offset,
7311 ins.offset, BTRFS_ORDERED_REGULAR);
7312 btrfs_dec_block_group_reservations(fs_info, ins.objectid);
7314 btrfs_free_reserved_extent(fs_info, ins.objectid,
7321 * returns 1 when the nocow is safe, < 1 on error, 0 if the
7322 * block must be cow'd
7324 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
7325 u64 *orig_start, u64 *orig_block_len,
7328 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
7329 struct btrfs_path *path;
7331 struct extent_buffer *leaf;
7332 struct btrfs_root *root = BTRFS_I(inode)->root;
7333 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
7334 struct btrfs_file_extent_item *fi;
7335 struct btrfs_key key;
7342 bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW);
7344 path = btrfs_alloc_path();
7348 ret = btrfs_lookup_file_extent(NULL, root, path,
7349 btrfs_ino(BTRFS_I(inode)), offset, 0);
7353 slot = path->slots[0];
7356 /* can't find the item, must cow */
7363 leaf = path->nodes[0];
7364 btrfs_item_key_to_cpu(leaf, &key, slot);
7365 if (key.objectid != btrfs_ino(BTRFS_I(inode)) ||
7366 key.type != BTRFS_EXTENT_DATA_KEY) {
7367 /* not our file or wrong item type, must cow */
7371 if (key.offset > offset) {
7372 /* Wrong offset, must cow */
7376 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
7377 found_type = btrfs_file_extent_type(leaf, fi);
7378 if (found_type != BTRFS_FILE_EXTENT_REG &&
7379 found_type != BTRFS_FILE_EXTENT_PREALLOC) {
7380 /* not a regular extent, must cow */
7384 if (!nocow && found_type == BTRFS_FILE_EXTENT_REG)
7387 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
7388 if (extent_end <= offset)
7391 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
7392 if (disk_bytenr == 0)
7395 if (btrfs_file_extent_compression(leaf, fi) ||
7396 btrfs_file_extent_encryption(leaf, fi) ||
7397 btrfs_file_extent_other_encoding(leaf, fi))
7401 * Do the same check as in btrfs_cross_ref_exist but without the
7402 * unnecessary search.
7404 if (btrfs_file_extent_generation(leaf, fi) <=
7405 btrfs_root_last_snapshot(&root->root_item))
7408 backref_offset = btrfs_file_extent_offset(leaf, fi);
7411 *orig_start = key.offset - backref_offset;
7412 *orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi);
7413 *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
7416 if (btrfs_extent_readonly(fs_info, disk_bytenr))
7419 num_bytes = min(offset + *len, extent_end) - offset;
7420 if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) {
7423 range_end = round_up(offset + num_bytes,
7424 root->fs_info->sectorsize) - 1;
7425 ret = test_range_bit(io_tree, offset, range_end,
7426 EXTENT_DELALLOC, 0, NULL);
7433 btrfs_release_path(path);
7436 * look for other files referencing this extent, if we
7437 * find any we must cow
7440 ret = btrfs_cross_ref_exist(root, btrfs_ino(BTRFS_I(inode)),
7441 key.offset - backref_offset, disk_bytenr);
7448 * adjust disk_bytenr and num_bytes to cover just the bytes
7449 * in this extent we are about to write. If there
7450 * are any csums in that range we have to cow in order
7451 * to keep the csums correct
7453 disk_bytenr += backref_offset;
7454 disk_bytenr += offset - key.offset;
7455 if (csum_exist_in_range(fs_info, disk_bytenr, num_bytes))
7458 * all of the above have passed, it is safe to overwrite this extent
7464 btrfs_free_path(path);
7468 static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend,
7469 struct extent_state **cached_state, int writing)
7471 struct btrfs_ordered_extent *ordered;
7475 lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend,
7478 * We're concerned with the entire range that we're going to be
7479 * doing DIO to, so we need to make sure there's no ordered
7480 * extents in this range.
7482 ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), lockstart,
7483 lockend - lockstart + 1);
7486 * We need to make sure there are no buffered pages in this
7487 * range either, we could have raced between the invalidate in
7488 * generic_file_direct_write and locking the extent. The
7489 * invalidate needs to happen so that reads after a write do not
7493 (!writing || !filemap_range_has_page(inode->i_mapping,
7494 lockstart, lockend)))
7497 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
7502 * If we are doing a DIO read and the ordered extent we
7503 * found is for a buffered write, we can not wait for it
7504 * to complete and retry, because if we do so we can
7505 * deadlock with concurrent buffered writes on page
7506 * locks. This happens only if our DIO read covers more
7507 * than one extent map, if at this point has already
7508 * created an ordered extent for a previous extent map
7509 * and locked its range in the inode's io tree, and a
7510 * concurrent write against that previous extent map's
7511 * range and this range started (we unlock the ranges
7512 * in the io tree only when the bios complete and
7513 * buffered writes always lock pages before attempting
7514 * to lock range in the io tree).
7517 test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags))
7518 btrfs_start_ordered_extent(inode, ordered, 1);
7521 btrfs_put_ordered_extent(ordered);
7524 * We could trigger writeback for this range (and wait
7525 * for it to complete) and then invalidate the pages for
7526 * this range (through invalidate_inode_pages2_range()),
7527 * but that can lead us to a deadlock with a concurrent
7528 * call to readpages() (a buffered read or a defrag call
7529 * triggered a readahead) on a page lock due to an
7530 * ordered dio extent we created before but did not have
7531 * yet a corresponding bio submitted (whence it can not
7532 * complete), which makes readpages() wait for that
7533 * ordered extent to complete while holding a lock on
7548 /* The callers of this must take lock_extent() */
7549 static struct extent_map *create_io_em(struct inode *inode, u64 start, u64 len,
7550 u64 orig_start, u64 block_start,
7551 u64 block_len, u64 orig_block_len,
7552 u64 ram_bytes, int compress_type,
7555 struct extent_map_tree *em_tree;
7556 struct extent_map *em;
7557 struct btrfs_root *root = BTRFS_I(inode)->root;
7560 ASSERT(type == BTRFS_ORDERED_PREALLOC ||
7561 type == BTRFS_ORDERED_COMPRESSED ||
7562 type == BTRFS_ORDERED_NOCOW ||
7563 type == BTRFS_ORDERED_REGULAR);
7565 em_tree = &BTRFS_I(inode)->extent_tree;
7566 em = alloc_extent_map();
7568 return ERR_PTR(-ENOMEM);
7571 em->orig_start = orig_start;
7573 em->block_len = block_len;
7574 em->block_start = block_start;
7575 em->bdev = root->fs_info->fs_devices->latest_bdev;
7576 em->orig_block_len = orig_block_len;
7577 em->ram_bytes = ram_bytes;
7578 em->generation = -1;
7579 set_bit(EXTENT_FLAG_PINNED, &em->flags);
7580 if (type == BTRFS_ORDERED_PREALLOC) {
7581 set_bit(EXTENT_FLAG_FILLING, &em->flags);
7582 } else if (type == BTRFS_ORDERED_COMPRESSED) {
7583 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
7584 em->compress_type = compress_type;
7588 btrfs_drop_extent_cache(BTRFS_I(inode), em->start,
7589 em->start + em->len - 1, 0);
7590 write_lock(&em_tree->lock);
7591 ret = add_extent_mapping(em_tree, em, 1);
7592 write_unlock(&em_tree->lock);
7594 * The caller has taken lock_extent(), who could race with us
7597 } while (ret == -EEXIST);
7600 free_extent_map(em);
7601 return ERR_PTR(ret);
7604 /* em got 2 refs now, callers needs to do free_extent_map once. */
7609 static int btrfs_get_blocks_direct_read(struct extent_map *em,
7610 struct buffer_head *bh_result,
7611 struct inode *inode,
7614 if (em->block_start == EXTENT_MAP_HOLE ||
7615 test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7618 len = min(len, em->len - (start - em->start));
7620 bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
7622 bh_result->b_size = len;
7623 bh_result->b_bdev = em->bdev;
7624 set_buffer_mapped(bh_result);
7629 static int btrfs_get_blocks_direct_write(struct extent_map **map,
7630 struct buffer_head *bh_result,
7631 struct inode *inode,
7632 struct btrfs_dio_data *dio_data,
7635 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
7636 struct extent_map *em = *map;
7640 * We don't allocate a new extent in the following cases
7642 * 1) The inode is marked as NODATACOW. In this case we'll just use the
7644 * 2) The extent is marked as PREALLOC. We're good to go here and can
7645 * just use the extent.
7648 if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) ||
7649 ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
7650 em->block_start != EXTENT_MAP_HOLE)) {
7652 u64 block_start, orig_start, orig_block_len, ram_bytes;
7654 if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7655 type = BTRFS_ORDERED_PREALLOC;
7657 type = BTRFS_ORDERED_NOCOW;
7658 len = min(len, em->len - (start - em->start));
7659 block_start = em->block_start + (start - em->start);
7661 if (can_nocow_extent(inode, start, &len, &orig_start,
7662 &orig_block_len, &ram_bytes) == 1 &&
7663 btrfs_inc_nocow_writers(fs_info, block_start)) {
7664 struct extent_map *em2;
7666 em2 = btrfs_create_dio_extent(inode, start, len,
7667 orig_start, block_start,
7668 len, orig_block_len,
7670 btrfs_dec_nocow_writers(fs_info, block_start);
7671 if (type == BTRFS_ORDERED_PREALLOC) {
7672 free_extent_map(em);
7676 if (em2 && IS_ERR(em2)) {
7681 * For inode marked NODATACOW or extent marked PREALLOC,
7682 * use the existing or preallocated extent, so does not
7683 * need to adjust btrfs_space_info's bytes_may_use.
7685 btrfs_free_reserved_data_space_noquota(inode, start,
7691 /* this will cow the extent */
7692 len = bh_result->b_size;
7693 free_extent_map(em);
7694 *map = em = btrfs_new_extent_direct(inode, start, len);
7700 len = min(len, em->len - (start - em->start));
7703 bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
7705 bh_result->b_size = len;
7706 bh_result->b_bdev = em->bdev;
7707 set_buffer_mapped(bh_result);
7709 if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
7710 set_buffer_new(bh_result);
7713 * Need to update the i_size under the extent lock so buffered
7714 * readers will get the updated i_size when we unlock.
7716 if (!dio_data->overwrite && start + len > i_size_read(inode))
7717 i_size_write(inode, start + len);
7719 WARN_ON(dio_data->reserve < len);
7720 dio_data->reserve -= len;
7721 dio_data->unsubmitted_oe_range_end = start + len;
7722 current->journal_info = dio_data;
7727 static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
7728 struct buffer_head *bh_result, int create)
7730 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
7731 struct extent_map *em;
7732 struct extent_state *cached_state = NULL;
7733 struct btrfs_dio_data *dio_data = NULL;
7734 u64 start = iblock << inode->i_blkbits;
7735 u64 lockstart, lockend;
7736 u64 len = bh_result->b_size;
7740 len = min_t(u64, len, fs_info->sectorsize);
7743 lockend = start + len - 1;
7745 if (current->journal_info) {
7747 * Need to pull our outstanding extents and set journal_info to NULL so
7748 * that anything that needs to check if there's a transaction doesn't get
7751 dio_data = current->journal_info;
7752 current->journal_info = NULL;
7756 * If this errors out it's because we couldn't invalidate pagecache for
7757 * this range and we need to fallback to buffered.
7759 if (lock_extent_direct(inode, lockstart, lockend, &cached_state,
7765 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
7772 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
7773 * io. INLINE is special, and we could probably kludge it in here, but
7774 * it's still buffered so for safety lets just fall back to the generic
7777 * For COMPRESSED we _have_ to read the entire extent in so we can
7778 * decompress it, so there will be buffering required no matter what we
7779 * do, so go ahead and fallback to buffered.
7781 * We return -ENOTBLK because that's what makes DIO go ahead and go back
7782 * to buffered IO. Don't blame me, this is the price we pay for using
7785 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
7786 em->block_start == EXTENT_MAP_INLINE) {
7787 free_extent_map(em);
7793 ret = btrfs_get_blocks_direct_write(&em, bh_result, inode,
7794 dio_data, start, len);
7798 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart,
7799 lockend, &cached_state);
7801 ret = btrfs_get_blocks_direct_read(em, bh_result, inode,
7803 /* Can be negative only if we read from a hole */
7806 free_extent_map(em);
7810 * We need to unlock only the end area that we aren't using.
7811 * The rest is going to be unlocked by the endio routine.
7813 lockstart = start + bh_result->b_size;
7814 if (lockstart < lockend) {
7815 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
7816 lockstart, lockend, &cached_state);
7818 free_extent_state(cached_state);
7822 free_extent_map(em);
7827 unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
7831 current->journal_info = dio_data;
7835 static inline blk_status_t submit_dio_repair_bio(struct inode *inode,
7839 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
7842 BUG_ON(bio_op(bio) == REQ_OP_WRITE);
7844 ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DIO_REPAIR);
7848 ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
7853 static int btrfs_check_dio_repairable(struct inode *inode,
7854 struct bio *failed_bio,
7855 struct io_failure_record *failrec,
7858 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
7861 num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len);
7862 if (num_copies == 1) {
7864 * we only have a single copy of the data, so don't bother with
7865 * all the retry and error correction code that follows. no
7866 * matter what the error is, it is very likely to persist.
7868 btrfs_debug(fs_info,
7869 "Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d",
7870 num_copies, failrec->this_mirror, failed_mirror);
7874 failrec->failed_mirror = failed_mirror;
7875 failrec->this_mirror++;
7876 if (failrec->this_mirror == failed_mirror)
7877 failrec->this_mirror++;
7879 if (failrec->this_mirror > num_copies) {
7880 btrfs_debug(fs_info,
7881 "Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d",
7882 num_copies, failrec->this_mirror, failed_mirror);
7889 static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
7890 struct page *page, unsigned int pgoff,
7891 u64 start, u64 end, int failed_mirror,
7892 bio_end_io_t *repair_endio, void *repair_arg)
7894 struct io_failure_record *failrec;
7895 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
7896 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
7899 unsigned int read_mode = 0;
7902 blk_status_t status;
7903 struct bio_vec bvec;
7905 BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
7907 ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
7909 return errno_to_blk_status(ret);
7911 ret = btrfs_check_dio_repairable(inode, failed_bio, failrec,
7914 free_io_failure(failure_tree, io_tree, failrec);
7915 return BLK_STS_IOERR;
7918 segs = bio_segments(failed_bio);
7919 bio_get_first_bvec(failed_bio, &bvec);
7921 (bvec.bv_len > btrfs_inode_sectorsize(inode)))
7922 read_mode |= REQ_FAILFAST_DEV;
7924 isector = start - btrfs_io_bio(failed_bio)->logical;
7925 isector >>= inode->i_sb->s_blocksize_bits;
7926 bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page,
7927 pgoff, isector, repair_endio, repair_arg);
7928 bio->bi_opf = REQ_OP_READ | read_mode;
7930 btrfs_debug(BTRFS_I(inode)->root->fs_info,
7931 "repair DIO read error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d",
7932 read_mode, failrec->this_mirror, failrec->in_validation);
7934 status = submit_dio_repair_bio(inode, bio, failrec->this_mirror);
7936 free_io_failure(failure_tree, io_tree, failrec);
7943 struct btrfs_retry_complete {
7944 struct completion done;
7945 struct inode *inode;
7950 static void btrfs_retry_endio_nocsum(struct bio *bio)
7952 struct btrfs_retry_complete *done = bio->bi_private;
7953 struct inode *inode = done->inode;
7954 struct bio_vec *bvec;
7955 struct extent_io_tree *io_tree, *failure_tree;
7956 struct bvec_iter_all iter_all;
7961 ASSERT(bio->bi_vcnt == 1);
7962 io_tree = &BTRFS_I(inode)->io_tree;
7963 failure_tree = &BTRFS_I(inode)->io_failure_tree;
7964 ASSERT(bio_first_bvec_all(bio)->bv_len == btrfs_inode_sectorsize(inode));
7967 ASSERT(!bio_flagged(bio, BIO_CLONED));
7968 bio_for_each_segment_all(bvec, bio, iter_all)
7969 clean_io_failure(BTRFS_I(inode)->root->fs_info, failure_tree,
7970 io_tree, done->start, bvec->bv_page,
7971 btrfs_ino(BTRFS_I(inode)), 0);
7973 complete(&done->done);
7977 static blk_status_t __btrfs_correct_data_nocsum(struct inode *inode,
7978 struct btrfs_io_bio *io_bio)
7980 struct btrfs_fs_info *fs_info;
7981 struct bio_vec bvec;
7982 struct bvec_iter iter;
7983 struct btrfs_retry_complete done;
7989 blk_status_t err = BLK_STS_OK;
7991 fs_info = BTRFS_I(inode)->root->fs_info;
7992 sectorsize = fs_info->sectorsize;
7994 start = io_bio->logical;
7996 io_bio->bio.bi_iter = io_bio->iter;
7998 bio_for_each_segment(bvec, &io_bio->bio, iter) {
7999 nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec.bv_len);
8000 pgoff = bvec.bv_offset;
8002 next_block_or_try_again:
8005 init_completion(&done.done);
8007 ret = dio_read_error(inode, &io_bio->bio, bvec.bv_page,
8008 pgoff, start, start + sectorsize - 1,
8010 btrfs_retry_endio_nocsum, &done);
8016 wait_for_completion_io(&done.done);
8018 if (!done.uptodate) {
8019 /* We might have another mirror, so try again */
8020 goto next_block_or_try_again;
8024 start += sectorsize;
8028 pgoff += sectorsize;
8029 ASSERT(pgoff < PAGE_SIZE);
8030 goto next_block_or_try_again;
8037 static void btrfs_retry_endio(struct bio *bio)
8039 struct btrfs_retry_complete *done = bio->bi_private;
8040 struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
8041 struct extent_io_tree *io_tree, *failure_tree;
8042 struct inode *inode = done->inode;
8043 struct bio_vec *bvec;
8047 struct bvec_iter_all iter_all;
8054 ASSERT(bio->bi_vcnt == 1);
8055 ASSERT(bio_first_bvec_all(bio)->bv_len == btrfs_inode_sectorsize(done->inode));
8057 io_tree = &BTRFS_I(inode)->io_tree;
8058 failure_tree = &BTRFS_I(inode)->io_failure_tree;
8060 ASSERT(!bio_flagged(bio, BIO_CLONED));
8061 bio_for_each_segment_all(bvec, bio, iter_all) {
8062 ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page,
8063 bvec->bv_offset, done->start,
8066 clean_io_failure(BTRFS_I(inode)->root->fs_info,
8067 failure_tree, io_tree, done->start,
8069 btrfs_ino(BTRFS_I(inode)),
8076 done->uptodate = uptodate;
8078 complete(&done->done);
8082 static blk_status_t __btrfs_subio_endio_read(struct inode *inode,
8083 struct btrfs_io_bio *io_bio, blk_status_t err)
8085 struct btrfs_fs_info *fs_info;
8086 struct bio_vec bvec;
8087 struct bvec_iter iter;
8088 struct btrfs_retry_complete done;
8095 bool uptodate = (err == 0);
8097 blk_status_t status;
8099 fs_info = BTRFS_I(inode)->root->fs_info;
8100 sectorsize = fs_info->sectorsize;
8103 start = io_bio->logical;
8105 io_bio->bio.bi_iter = io_bio->iter;
8107 bio_for_each_segment(bvec, &io_bio->bio, iter) {
8108 nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec.bv_len);
8110 pgoff = bvec.bv_offset;
8113 csum_pos = BTRFS_BYTES_TO_BLKS(fs_info, offset);
8114 ret = __readpage_endio_check(inode, io_bio, csum_pos,
8115 bvec.bv_page, pgoff, start, sectorsize);
8122 init_completion(&done.done);
8124 status = dio_read_error(inode, &io_bio->bio, bvec.bv_page,
8125 pgoff, start, start + sectorsize - 1,
8126 io_bio->mirror_num, btrfs_retry_endio,
8133 wait_for_completion_io(&done.done);
8135 if (!done.uptodate) {
8136 /* We might have another mirror, so try again */
8140 offset += sectorsize;
8141 start += sectorsize;
8147 pgoff += sectorsize;
8148 ASSERT(pgoff < PAGE_SIZE);
8156 static blk_status_t btrfs_subio_endio_read(struct inode *inode,
8157 struct btrfs_io_bio *io_bio, blk_status_t err)
8159 bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
8163 return __btrfs_correct_data_nocsum(inode, io_bio);
8167 return __btrfs_subio_endio_read(inode, io_bio, err);
8171 static void btrfs_endio_direct_read(struct bio *bio)
8173 struct btrfs_dio_private *dip = bio->bi_private;
8174 struct inode *inode = dip->inode;
8175 struct bio *dio_bio;
8176 struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
8177 blk_status_t err = bio->bi_status;
8179 if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED)
8180 err = btrfs_subio_endio_read(inode, io_bio, err);
8182 unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset,
8183 dip->logical_offset + dip->bytes - 1);
8184 dio_bio = dip->dio_bio;
8188 dio_bio->bi_status = err;
8189 dio_end_io(dio_bio);
8190 btrfs_io_bio_free_csum(io_bio);
8194 static void __endio_write_update_ordered(struct inode *inode,
8195 const u64 offset, const u64 bytes,
8196 const bool uptodate)
8198 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8199 struct btrfs_ordered_extent *ordered = NULL;
8200 struct btrfs_workqueue *wq;
8201 btrfs_work_func_t func;
8202 u64 ordered_offset = offset;
8203 u64 ordered_bytes = bytes;
8206 if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
8207 wq = fs_info->endio_freespace_worker;
8208 func = btrfs_freespace_write_helper;
8210 wq = fs_info->endio_write_workers;
8211 func = btrfs_endio_write_helper;
8214 while (ordered_offset < offset + bytes) {
8215 last_offset = ordered_offset;
8216 if (btrfs_dec_test_first_ordered_pending(inode, &ordered,
8220 btrfs_init_work(&ordered->work, func,
8223 btrfs_queue_work(wq, &ordered->work);
8226 * If btrfs_dec_test_ordered_pending does not find any ordered
8227 * extent in the range, we can exit.
8229 if (ordered_offset == last_offset)
8232 * Our bio might span multiple ordered extents. In this case
8233 * we keep going until we have accounted the whole dio.
8235 if (ordered_offset < offset + bytes) {
8236 ordered_bytes = offset + bytes - ordered_offset;
8242 static void btrfs_endio_direct_write(struct bio *bio)
8244 struct btrfs_dio_private *dip = bio->bi_private;
8245 struct bio *dio_bio = dip->dio_bio;
8247 __endio_write_update_ordered(dip->inode, dip->logical_offset,
8248 dip->bytes, !bio->bi_status);
8252 dio_bio->bi_status = bio->bi_status;
8253 dio_end_io(dio_bio);
8257 static blk_status_t btrfs_submit_bio_start_direct_io(void *private_data,
8258 struct bio *bio, u64 offset)
8260 struct inode *inode = private_data;
8262 ret = btrfs_csum_one_bio(inode, bio, offset, 1);
8263 BUG_ON(ret); /* -ENOMEM */
8267 static void btrfs_end_dio_bio(struct bio *bio)
8269 struct btrfs_dio_private *dip = bio->bi_private;
8270 blk_status_t err = bio->bi_status;
8273 btrfs_warn(BTRFS_I(dip->inode)->root->fs_info,
8274 "direct IO failed ino %llu rw %d,%u sector %#Lx len %u err no %d",
8275 btrfs_ino(BTRFS_I(dip->inode)), bio_op(bio),
8277 (unsigned long long)bio->bi_iter.bi_sector,
8278 bio->bi_iter.bi_size, err);
8280 if (dip->subio_endio)
8281 err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err);
8285 * We want to perceive the errors flag being set before
8286 * decrementing the reference count. We don't need a barrier
8287 * since atomic operations with a return value are fully
8288 * ordered as per atomic_t.txt
8293 /* if there are more bios still pending for this dio, just exit */
8294 if (!atomic_dec_and_test(&dip->pending_bios))
8298 bio_io_error(dip->orig_bio);
8300 dip->dio_bio->bi_status = BLK_STS_OK;
8301 bio_endio(dip->orig_bio);
8307 static inline blk_status_t btrfs_lookup_and_bind_dio_csum(struct inode *inode,
8308 struct btrfs_dio_private *dip,
8312 struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
8313 struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio);
8317 * We load all the csum data we need when we submit
8318 * the first bio to reduce the csum tree search and
8321 if (dip->logical_offset == file_offset) {
8322 ret = btrfs_lookup_bio_sums_dio(inode, dip->orig_bio,
8328 if (bio == dip->orig_bio)
8331 file_offset -= dip->logical_offset;
8332 file_offset >>= inode->i_sb->s_blocksize_bits;
8333 io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset);
8338 static inline blk_status_t btrfs_submit_dio_bio(struct bio *bio,
8339 struct inode *inode, u64 file_offset, int async_submit)
8341 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8342 struct btrfs_dio_private *dip = bio->bi_private;
8343 bool write = bio_op(bio) == REQ_OP_WRITE;
8346 /* Check btrfs_submit_bio_hook() for rules about async submit. */
8348 async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers);
8351 ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA);
8356 if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
8359 if (write && async_submit) {
8360 ret = btrfs_wq_submit_bio(fs_info, bio, 0, 0,
8362 btrfs_submit_bio_start_direct_io);
8366 * If we aren't doing async submit, calculate the csum of the
8369 ret = btrfs_csum_one_bio(inode, bio, file_offset, 1);
8373 ret = btrfs_lookup_and_bind_dio_csum(inode, dip, bio,
8379 ret = btrfs_map_bio(fs_info, bio, 0, 0);
8384 static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip)
8386 struct inode *inode = dip->inode;
8387 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8389 struct bio *orig_bio = dip->orig_bio;
8390 u64 start_sector = orig_bio->bi_iter.bi_sector;
8391 u64 file_offset = dip->logical_offset;
8392 int async_submit = 0;
8394 int clone_offset = 0;
8397 blk_status_t status;
8398 struct btrfs_io_geometry geom;
8400 submit_len = orig_bio->bi_iter.bi_size;
8401 ret = btrfs_get_io_geometry(fs_info, btrfs_op(orig_bio),
8402 start_sector << 9, submit_len, &geom);
8406 if (geom.len >= submit_len) {
8408 dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED;
8412 /* async crcs make it difficult to collect full stripe writes. */
8413 if (btrfs_data_alloc_profile(fs_info) & BTRFS_BLOCK_GROUP_RAID56_MASK)
8419 ASSERT(geom.len <= INT_MAX);
8420 atomic_inc(&dip->pending_bios);
8422 clone_len = min_t(int, submit_len, geom.len);
8425 * This will never fail as it's passing GPF_NOFS and
8426 * the allocation is backed by btrfs_bioset.
8428 bio = btrfs_bio_clone_partial(orig_bio, clone_offset,
8430 bio->bi_private = dip;
8431 bio->bi_end_io = btrfs_end_dio_bio;
8432 btrfs_io_bio(bio)->logical = file_offset;
8434 ASSERT(submit_len >= clone_len);
8435 submit_len -= clone_len;
8436 if (submit_len == 0)
8440 * Increase the count before we submit the bio so we know
8441 * the end IO handler won't happen before we increase the
8442 * count. Otherwise, the dip might get freed before we're
8443 * done setting it up.
8445 atomic_inc(&dip->pending_bios);
8447 status = btrfs_submit_dio_bio(bio, inode, file_offset,
8451 atomic_dec(&dip->pending_bios);
8455 clone_offset += clone_len;
8456 start_sector += clone_len >> 9;
8457 file_offset += clone_len;
8459 ret = btrfs_get_io_geometry(fs_info, btrfs_op(orig_bio),
8460 start_sector << 9, submit_len, &geom);
8463 } while (submit_len > 0);
8466 status = btrfs_submit_dio_bio(bio, inode, file_offset, async_submit);
8474 * Before atomic variable goto zero, we must make sure dip->errors is
8475 * perceived to be set. This ordering is ensured by the fact that an
8476 * atomic operations with a return value are fully ordered as per
8479 if (atomic_dec_and_test(&dip->pending_bios))
8480 bio_io_error(dip->orig_bio);
8482 /* bio_end_io() will handle error, so we needn't return it */
8486 static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
8489 struct btrfs_dio_private *dip = NULL;
8490 struct bio *bio = NULL;
8491 struct btrfs_io_bio *io_bio;
8492 bool write = (bio_op(dio_bio) == REQ_OP_WRITE);
8495 bio = btrfs_bio_clone(dio_bio);
8497 dip = kzalloc(sizeof(*dip), GFP_NOFS);
8503 dip->private = dio_bio->bi_private;
8505 dip->logical_offset = file_offset;
8506 dip->bytes = dio_bio->bi_iter.bi_size;
8507 dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9;
8508 bio->bi_private = dip;
8509 dip->orig_bio = bio;
8510 dip->dio_bio = dio_bio;
8511 atomic_set(&dip->pending_bios, 0);
8512 io_bio = btrfs_io_bio(bio);
8513 io_bio->logical = file_offset;
8516 bio->bi_end_io = btrfs_endio_direct_write;
8518 bio->bi_end_io = btrfs_endio_direct_read;
8519 dip->subio_endio = btrfs_subio_endio_read;
8523 * Reset the range for unsubmitted ordered extents (to a 0 length range)
8524 * even if we fail to submit a bio, because in such case we do the
8525 * corresponding error handling below and it must not be done a second
8526 * time by btrfs_direct_IO().
8529 struct btrfs_dio_data *dio_data = current->journal_info;
8531 dio_data->unsubmitted_oe_range_end = dip->logical_offset +
8533 dio_data->unsubmitted_oe_range_start =
8534 dio_data->unsubmitted_oe_range_end;
8537 ret = btrfs_submit_direct_hook(dip);
8541 btrfs_io_bio_free_csum(io_bio);
8545 * If we arrived here it means either we failed to submit the dip
8546 * or we either failed to clone the dio_bio or failed to allocate the
8547 * dip. If we cloned the dio_bio and allocated the dip, we can just
8548 * call bio_endio against our io_bio so that we get proper resource
8549 * cleanup if we fail to submit the dip, otherwise, we must do the
8550 * same as btrfs_endio_direct_[write|read] because we can't call these
8551 * callbacks - they require an allocated dip and a clone of dio_bio.
8556 * The end io callbacks free our dip, do the final put on bio
8557 * and all the cleanup and final put for dio_bio (through
8564 __endio_write_update_ordered(inode,
8566 dio_bio->bi_iter.bi_size,
8569 unlock_extent(&BTRFS_I(inode)->io_tree, file_offset,
8570 file_offset + dio_bio->bi_iter.bi_size - 1);
8572 dio_bio->bi_status = BLK_STS_IOERR;
8574 * Releases and cleans up our dio_bio, no need to bio_put()
8575 * nor bio_endio()/bio_io_error() against dio_bio.
8577 dio_end_io(dio_bio);
8584 static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
8585 const struct iov_iter *iter, loff_t offset)
8589 unsigned int blocksize_mask = fs_info->sectorsize - 1;
8590 ssize_t retval = -EINVAL;
8592 if (offset & blocksize_mask)
8595 if (iov_iter_alignment(iter) & blocksize_mask)
8598 /* If this is a write we don't need to check anymore */
8599 if (iov_iter_rw(iter) != READ || !iter_is_iovec(iter))
8602 * Check to make sure we don't have duplicate iov_base's in this
8603 * iovec, if so return EINVAL, otherwise we'll get csum errors
8604 * when reading back.
8606 for (seg = 0; seg < iter->nr_segs; seg++) {
8607 for (i = seg + 1; i < iter->nr_segs; i++) {
8608 if (iter->iov[seg].iov_base == iter->iov[i].iov_base)
8617 static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
8619 struct file *file = iocb->ki_filp;
8620 struct inode *inode = file->f_mapping->host;
8621 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8622 struct btrfs_dio_data dio_data = { 0 };
8623 struct extent_changeset *data_reserved = NULL;
8624 loff_t offset = iocb->ki_pos;
8628 bool relock = false;
8631 if (check_direct_IO(fs_info, iter, offset))
8634 inode_dio_begin(inode);
8637 * The generic stuff only does filemap_write_and_wait_range, which
8638 * isn't enough if we've written compressed pages to this area, so
8639 * we need to flush the dirty pages again to make absolutely sure
8640 * that any outstanding dirty pages are on disk.
8642 count = iov_iter_count(iter);
8643 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
8644 &BTRFS_I(inode)->runtime_flags))
8645 filemap_fdatawrite_range(inode->i_mapping, offset,
8646 offset + count - 1);
8648 if (iov_iter_rw(iter) == WRITE) {
8650 * If the write DIO is beyond the EOF, we need update
8651 * the isize, but it is protected by i_mutex. So we can
8652 * not unlock the i_mutex at this case.
8654 if (offset + count <= inode->i_size) {
8655 dio_data.overwrite = 1;
8656 inode_unlock(inode);
8658 } else if (iocb->ki_flags & IOCB_NOWAIT) {
8662 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
8668 * We need to know how many extents we reserved so that we can
8669 * do the accounting properly if we go over the number we
8670 * originally calculated. Abuse current->journal_info for this.
8672 dio_data.reserve = round_up(count,
8673 fs_info->sectorsize);
8674 dio_data.unsubmitted_oe_range_start = (u64)offset;
8675 dio_data.unsubmitted_oe_range_end = (u64)offset;
8676 current->journal_info = &dio_data;
8677 down_read(&BTRFS_I(inode)->dio_sem);
8678 } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK,
8679 &BTRFS_I(inode)->runtime_flags)) {
8680 inode_dio_end(inode);
8681 flags = DIO_LOCKING | DIO_SKIP_HOLES;
8685 ret = __blockdev_direct_IO(iocb, inode,
8686 fs_info->fs_devices->latest_bdev,
8687 iter, btrfs_get_blocks_direct, NULL,
8688 btrfs_submit_direct, flags);
8689 if (iov_iter_rw(iter) == WRITE) {
8690 up_read(&BTRFS_I(inode)->dio_sem);
8691 current->journal_info = NULL;
8692 if (ret < 0 && ret != -EIOCBQUEUED) {
8693 if (dio_data.reserve)
8694 btrfs_delalloc_release_space(inode, data_reserved,
8695 offset, dio_data.reserve, true);
8697 * On error we might have left some ordered extents
8698 * without submitting corresponding bios for them, so
8699 * cleanup them up to avoid other tasks getting them
8700 * and waiting for them to complete forever.
8702 if (dio_data.unsubmitted_oe_range_start <
8703 dio_data.unsubmitted_oe_range_end)
8704 __endio_write_update_ordered(inode,
8705 dio_data.unsubmitted_oe_range_start,
8706 dio_data.unsubmitted_oe_range_end -
8707 dio_data.unsubmitted_oe_range_start,
8709 } else if (ret >= 0 && (size_t)ret < count)
8710 btrfs_delalloc_release_space(inode, data_reserved,
8711 offset, count - (size_t)ret, true);
8712 btrfs_delalloc_release_extents(BTRFS_I(inode), count);
8716 inode_dio_end(inode);
8720 extent_changeset_free(data_reserved);
8724 #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
8726 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
8727 __u64 start, __u64 len)
8731 ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS);
8735 return extent_fiemap(inode, fieinfo, start, len);
8738 int btrfs_readpage(struct file *file, struct page *page)
8740 struct extent_io_tree *tree;
8741 tree = &BTRFS_I(page->mapping->host)->io_tree;
8742 return extent_read_full_page(tree, page, btrfs_get_extent, 0);
8745 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
8747 struct inode *inode = page->mapping->host;
8750 if (current->flags & PF_MEMALLOC) {
8751 redirty_page_for_writepage(wbc, page);
8757 * If we are under memory pressure we will call this directly from the
8758 * VM, we need to make sure we have the inode referenced for the ordered
8759 * extent. If not just return like we didn't do anything.
8761 if (!igrab(inode)) {
8762 redirty_page_for_writepage(wbc, page);
8763 return AOP_WRITEPAGE_ACTIVATE;
8765 ret = extent_write_full_page(page, wbc);
8766 btrfs_add_delayed_iput(inode);
8770 static int btrfs_writepages(struct address_space *mapping,
8771 struct writeback_control *wbc)
8773 return extent_writepages(mapping, wbc);
8777 btrfs_readpages(struct file *file, struct address_space *mapping,
8778 struct list_head *pages, unsigned nr_pages)
8780 return extent_readpages(mapping, pages, nr_pages);
8783 static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
8785 int ret = try_release_extent_mapping(page, gfp_flags);
8787 ClearPagePrivate(page);
8788 set_page_private(page, 0);
8794 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
8796 if (PageWriteback(page) || PageDirty(page))
8798 return __btrfs_releasepage(page, gfp_flags);
8801 static void btrfs_invalidatepage(struct page *page, unsigned int offset,
8802 unsigned int length)
8804 struct inode *inode = page->mapping->host;
8805 struct extent_io_tree *tree;
8806 struct btrfs_ordered_extent *ordered;
8807 struct extent_state *cached_state = NULL;
8808 u64 page_start = page_offset(page);
8809 u64 page_end = page_start + PAGE_SIZE - 1;
8812 int inode_evicting = inode->i_state & I_FREEING;
8815 * we have the page locked, so new writeback can't start,
8816 * and the dirty bit won't be cleared while we are here.
8818 * Wait for IO on this page so that we can safely clear
8819 * the PagePrivate2 bit and do ordered accounting
8821 wait_on_page_writeback(page);
8823 tree = &BTRFS_I(inode)->io_tree;
8825 btrfs_releasepage(page, GFP_NOFS);
8829 if (!inode_evicting)
8830 lock_extent_bits(tree, page_start, page_end, &cached_state);
8833 ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start,
8834 page_end - start + 1);
8836 end = min(page_end, ordered->file_offset + ordered->len - 1);
8838 * IO on this page will never be started, so we need
8839 * to account for any ordered extents now
8841 if (!inode_evicting)
8842 clear_extent_bit(tree, start, end,
8843 EXTENT_DELALLOC | EXTENT_DELALLOC_NEW |
8844 EXTENT_LOCKED | EXTENT_DO_ACCOUNTING |
8845 EXTENT_DEFRAG, 1, 0, &cached_state);
8847 * whoever cleared the private bit is responsible
8848 * for the finish_ordered_io
8850 if (TestClearPagePrivate2(page)) {
8851 struct btrfs_ordered_inode_tree *tree;
8854 tree = &BTRFS_I(inode)->ordered_tree;
8856 spin_lock_irq(&tree->lock);
8857 set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
8858 new_len = start - ordered->file_offset;
8859 if (new_len < ordered->truncated_len)
8860 ordered->truncated_len = new_len;
8861 spin_unlock_irq(&tree->lock);
8863 if (btrfs_dec_test_ordered_pending(inode, &ordered,
8865 end - start + 1, 1))
8866 btrfs_finish_ordered_io(ordered);
8868 btrfs_put_ordered_extent(ordered);
8869 if (!inode_evicting) {
8870 cached_state = NULL;
8871 lock_extent_bits(tree, start, end,
8876 if (start < page_end)
8881 * Qgroup reserved space handler
8882 * Page here will be either
8883 * 1) Already written to disk
8884 * In this case, its reserved space is released from data rsv map
8885 * and will be freed by delayed_ref handler finally.
8886 * So even we call qgroup_free_data(), it won't decrease reserved
8888 * 2) Not written to disk
8889 * This means the reserved space should be freed here. However,
8890 * if a truncate invalidates the page (by clearing PageDirty)
8891 * and the page is accounted for while allocating extent
8892 * in btrfs_check_data_free_space() we let delayed_ref to
8893 * free the entire extent.
8895 if (PageDirty(page))
8896 btrfs_qgroup_free_data(inode, NULL, page_start, PAGE_SIZE);
8897 if (!inode_evicting) {
8898 clear_extent_bit(tree, page_start, page_end, EXTENT_LOCKED |
8899 EXTENT_DELALLOC | EXTENT_DELALLOC_NEW |
8900 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 1, 1,
8903 __btrfs_releasepage(page, GFP_NOFS);
8906 ClearPageChecked(page);
8907 if (PagePrivate(page)) {
8908 ClearPagePrivate(page);
8909 set_page_private(page, 0);
8915 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
8916 * called from a page fault handler when a page is first dirtied. Hence we must
8917 * be careful to check for EOF conditions here. We set the page up correctly
8918 * for a written page which means we get ENOSPC checking when writing into
8919 * holes and correct delalloc and unwritten extent mapping on filesystems that
8920 * support these features.
8922 * We are not allowed to take the i_mutex here so we have to play games to
8923 * protect against truncate races as the page could now be beyond EOF. Because
8924 * truncate_setsize() writes the inode size before removing pages, once we have
8925 * the page lock we can determine safely if the page is beyond EOF. If it is not
8926 * beyond EOF, then the page is guaranteed safe against truncation until we
8929 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
8931 struct page *page = vmf->page;
8932 struct inode *inode = file_inode(vmf->vma->vm_file);
8933 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8934 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
8935 struct btrfs_ordered_extent *ordered;
8936 struct extent_state *cached_state = NULL;
8937 struct extent_changeset *data_reserved = NULL;
8939 unsigned long zero_start;
8949 reserved_space = PAGE_SIZE;
8951 sb_start_pagefault(inode->i_sb);
8952 page_start = page_offset(page);
8953 page_end = page_start + PAGE_SIZE - 1;
8957 * Reserving delalloc space after obtaining the page lock can lead to
8958 * deadlock. For example, if a dirty page is locked by this function
8959 * and the call to btrfs_delalloc_reserve_space() ends up triggering
8960 * dirty page write out, then the btrfs_writepage() function could
8961 * end up waiting indefinitely to get a lock on the page currently
8962 * being processed by btrfs_page_mkwrite() function.
8964 ret2 = btrfs_delalloc_reserve_space(inode, &data_reserved, page_start,
8967 ret2 = file_update_time(vmf->vma->vm_file);
8971 ret = vmf_error(ret2);
8977 ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
8980 size = i_size_read(inode);
8982 if ((page->mapping != inode->i_mapping) ||
8983 (page_start >= size)) {
8984 /* page got truncated out from underneath us */
8987 wait_on_page_writeback(page);
8989 lock_extent_bits(io_tree, page_start, page_end, &cached_state);
8990 set_page_extent_mapped(page);
8993 * we can't set the delalloc bits if there are pending ordered
8994 * extents. Drop our locks and wait for them to finish
8996 ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), page_start,
8999 unlock_extent_cached(io_tree, page_start, page_end,
9002 btrfs_start_ordered_extent(inode, ordered, 1);
9003 btrfs_put_ordered_extent(ordered);
9007 if (page->index == ((size - 1) >> PAGE_SHIFT)) {
9008 reserved_space = round_up(size - page_start,
9009 fs_info->sectorsize);
9010 if (reserved_space < PAGE_SIZE) {
9011 end = page_start + reserved_space - 1;
9012 btrfs_delalloc_release_space(inode, data_reserved,
9013 page_start, PAGE_SIZE - reserved_space,
9019 * page_mkwrite gets called when the page is firstly dirtied after it's
9020 * faulted in, but write(2) could also dirty a page and set delalloc
9021 * bits, thus in this case for space account reason, we still need to
9022 * clear any delalloc bits within this page range since we have to
9023 * reserve data&meta space before lock_page() (see above comments).
9025 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, end,
9026 EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
9027 EXTENT_DEFRAG, 0, 0, &cached_state);
9029 ret2 = btrfs_set_extent_delalloc(inode, page_start, end, 0,
9032 unlock_extent_cached(io_tree, page_start, page_end,
9034 ret = VM_FAULT_SIGBUS;
9039 /* page is wholly or partially inside EOF */
9040 if (page_start + PAGE_SIZE > size)
9041 zero_start = offset_in_page(size);
9043 zero_start = PAGE_SIZE;
9045 if (zero_start != PAGE_SIZE) {
9047 memset(kaddr + zero_start, 0, PAGE_SIZE - zero_start);
9048 flush_dcache_page(page);
9051 ClearPageChecked(page);
9052 set_page_dirty(page);
9053 SetPageUptodate(page);
9055 BTRFS_I(inode)->last_trans = fs_info->generation;
9056 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
9057 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
9059 unlock_extent_cached(io_tree, page_start, page_end, &cached_state);
9062 btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
9063 sb_end_pagefault(inode->i_sb);
9064 extent_changeset_free(data_reserved);
9065 return VM_FAULT_LOCKED;
9071 btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
9072 btrfs_delalloc_release_space(inode, data_reserved, page_start,
9073 reserved_space, (ret != 0));
9075 sb_end_pagefault(inode->i_sb);
9076 extent_changeset_free(data_reserved);
9080 static int btrfs_truncate(struct inode *inode, bool skip_writeback)
9082 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
9083 struct btrfs_root *root = BTRFS_I(inode)->root;
9084 struct btrfs_block_rsv *rsv;
9086 struct btrfs_trans_handle *trans;
9087 u64 mask = fs_info->sectorsize - 1;
9088 u64 min_size = btrfs_calc_metadata_size(fs_info, 1);
9090 if (!skip_writeback) {
9091 ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask),
9098 * Yes ladies and gentlemen, this is indeed ugly. We have a couple of
9099 * things going on here:
9101 * 1) We need to reserve space to update our inode.
9103 * 2) We need to have something to cache all the space that is going to
9104 * be free'd up by the truncate operation, but also have some slack
9105 * space reserved in case it uses space during the truncate (thank you
9106 * very much snapshotting).
9108 * And we need these to be separate. The fact is we can use a lot of
9109 * space doing the truncate, and we have no earthly idea how much space
9110 * we will use, so we need the truncate reservation to be separate so it
9111 * doesn't end up using space reserved for updating the inode. We also
9112 * need to be able to stop the transaction and start a new one, which
9113 * means we need to be able to update the inode several times, and we
9114 * have no idea of knowing how many times that will be, so we can't just
9115 * reserve 1 item for the entirety of the operation, so that has to be
9116 * done separately as well.
9118 * So that leaves us with
9120 * 1) rsv - for the truncate reservation, which we will steal from the
9121 * transaction reservation.
9122 * 2) fs_info->trans_block_rsv - this will have 1 items worth left for
9123 * updating the inode.
9125 rsv = btrfs_alloc_block_rsv(fs_info, BTRFS_BLOCK_RSV_TEMP);
9128 rsv->size = min_size;
9132 * 1 for the truncate slack space
9133 * 1 for updating the inode.
9135 trans = btrfs_start_transaction(root, 2);
9136 if (IS_ERR(trans)) {
9137 ret = PTR_ERR(trans);
9141 /* Migrate the slack space for the truncate to our reserve */
9142 ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv, rsv,
9147 * So if we truncate and then write and fsync we normally would just
9148 * write the extents that changed, which is a problem if we need to
9149 * first truncate that entire inode. So set this flag so we write out
9150 * all of the extents in the inode to the sync log so we're completely
9153 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
9154 trans->block_rsv = rsv;
9157 ret = btrfs_truncate_inode_items(trans, root, inode,
9159 BTRFS_EXTENT_DATA_KEY);
9160 trans->block_rsv = &fs_info->trans_block_rsv;
9161 if (ret != -ENOSPC && ret != -EAGAIN)
9164 ret = btrfs_update_inode(trans, root, inode);
9168 btrfs_end_transaction(trans);
9169 btrfs_btree_balance_dirty(fs_info);
9171 trans = btrfs_start_transaction(root, 2);
9172 if (IS_ERR(trans)) {
9173 ret = PTR_ERR(trans);
9178 btrfs_block_rsv_release(fs_info, rsv, -1);
9179 ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv,
9180 rsv, min_size, false);
9181 BUG_ON(ret); /* shouldn't happen */
9182 trans->block_rsv = rsv;
9186 * We can't call btrfs_truncate_block inside a trans handle as we could
9187 * deadlock with freeze, if we got NEED_TRUNCATE_BLOCK then we know
9188 * we've truncated everything except the last little bit, and can do
9189 * btrfs_truncate_block and then update the disk_i_size.
9191 if (ret == NEED_TRUNCATE_BLOCK) {
9192 btrfs_end_transaction(trans);
9193 btrfs_btree_balance_dirty(fs_info);
9195 ret = btrfs_truncate_block(inode, inode->i_size, 0, 0);
9198 trans = btrfs_start_transaction(root, 1);
9199 if (IS_ERR(trans)) {
9200 ret = PTR_ERR(trans);
9203 btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
9209 trans->block_rsv = &fs_info->trans_block_rsv;
9210 ret2 = btrfs_update_inode(trans, root, inode);
9214 ret2 = btrfs_end_transaction(trans);
9217 btrfs_btree_balance_dirty(fs_info);
9220 btrfs_free_block_rsv(fs_info, rsv);
9226 * create a new subvolume directory/inode (helper for the ioctl).
9228 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
9229 struct btrfs_root *new_root,
9230 struct btrfs_root *parent_root,
9233 struct inode *inode;
9237 inode = btrfs_new_inode(trans, new_root, NULL, "..", 2,
9238 new_dirid, new_dirid,
9239 S_IFDIR | (~current_umask() & S_IRWXUGO),
9242 return PTR_ERR(inode);
9243 inode->i_op = &btrfs_dir_inode_operations;
9244 inode->i_fop = &btrfs_dir_file_operations;
9246 set_nlink(inode, 1);
9247 btrfs_i_size_write(BTRFS_I(inode), 0);
9248 unlock_new_inode(inode);
9250 err = btrfs_subvol_inherit_props(trans, new_root, parent_root);
9252 btrfs_err(new_root->fs_info,
9253 "error inheriting subvolume %llu properties: %d",
9254 new_root->root_key.objectid, err);
9256 err = btrfs_update_inode(trans, new_root, inode);
9262 struct inode *btrfs_alloc_inode(struct super_block *sb)
9264 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
9265 struct btrfs_inode *ei;
9266 struct inode *inode;
9268 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_KERNEL);
9275 ei->last_sub_trans = 0;
9276 ei->logged_trans = 0;
9277 ei->delalloc_bytes = 0;
9278 ei->new_delalloc_bytes = 0;
9279 ei->defrag_bytes = 0;
9280 ei->disk_i_size = 0;
9283 ei->index_cnt = (u64)-1;
9285 ei->last_unlink_trans = 0;
9286 ei->last_log_commit = 0;
9288 spin_lock_init(&ei->lock);
9289 ei->outstanding_extents = 0;
9290 if (sb->s_magic != BTRFS_TEST_MAGIC)
9291 btrfs_init_metadata_block_rsv(fs_info, &ei->block_rsv,
9292 BTRFS_BLOCK_RSV_DELALLOC);
9293 ei->runtime_flags = 0;
9294 ei->prop_compress = BTRFS_COMPRESS_NONE;
9295 ei->defrag_compress = BTRFS_COMPRESS_NONE;
9297 ei->delayed_node = NULL;
9299 ei->i_otime.tv_sec = 0;
9300 ei->i_otime.tv_nsec = 0;
9302 inode = &ei->vfs_inode;
9303 extent_map_tree_init(&ei->extent_tree);
9304 extent_io_tree_init(fs_info, &ei->io_tree, IO_TREE_INODE_IO, inode);
9305 extent_io_tree_init(fs_info, &ei->io_failure_tree,
9306 IO_TREE_INODE_IO_FAILURE, inode);
9307 ei->io_tree.track_uptodate = true;
9308 ei->io_failure_tree.track_uptodate = true;
9309 atomic_set(&ei->sync_writers, 0);
9310 mutex_init(&ei->log_mutex);
9311 mutex_init(&ei->delalloc_mutex);
9312 btrfs_ordered_inode_tree_init(&ei->ordered_tree);
9313 INIT_LIST_HEAD(&ei->delalloc_inodes);
9314 INIT_LIST_HEAD(&ei->delayed_iput);
9315 RB_CLEAR_NODE(&ei->rb_node);
9316 init_rwsem(&ei->dio_sem);
9321 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9322 void btrfs_test_destroy_inode(struct inode *inode)
9324 btrfs_drop_extent_cache(BTRFS_I(inode), 0, (u64)-1, 0);
9325 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
9329 void btrfs_free_inode(struct inode *inode)
9331 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
9334 void btrfs_destroy_inode(struct inode *inode)
9336 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
9337 struct btrfs_ordered_extent *ordered;
9338 struct btrfs_root *root = BTRFS_I(inode)->root;
9340 WARN_ON(!hlist_empty(&inode->i_dentry));
9341 WARN_ON(inode->i_data.nrpages);
9342 WARN_ON(BTRFS_I(inode)->block_rsv.reserved);
9343 WARN_ON(BTRFS_I(inode)->block_rsv.size);
9344 WARN_ON(BTRFS_I(inode)->outstanding_extents);
9345 WARN_ON(BTRFS_I(inode)->delalloc_bytes);
9346 WARN_ON(BTRFS_I(inode)->new_delalloc_bytes);
9347 WARN_ON(BTRFS_I(inode)->csum_bytes);
9348 WARN_ON(BTRFS_I(inode)->defrag_bytes);
9351 * This can happen where we create an inode, but somebody else also
9352 * created the same inode and we need to destroy the one we already
9359 ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
9364 "found ordered extent %llu %llu on inode cleanup",
9365 ordered->file_offset, ordered->len);
9366 btrfs_remove_ordered_extent(inode, ordered);
9367 btrfs_put_ordered_extent(ordered);
9368 btrfs_put_ordered_extent(ordered);
9371 btrfs_qgroup_check_reserved_leak(inode);
9372 inode_tree_del(inode);
9373 btrfs_drop_extent_cache(BTRFS_I(inode), 0, (u64)-1, 0);
9376 int btrfs_drop_inode(struct inode *inode)
9378 struct btrfs_root *root = BTRFS_I(inode)->root;
9383 /* the snap/subvol tree is on deleting */
9384 if (btrfs_root_refs(&root->root_item) == 0)
9387 return generic_drop_inode(inode);
9390 static void init_once(void *foo)
9392 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
9394 inode_init_once(&ei->vfs_inode);
9397 void __cold btrfs_destroy_cachep(void)
9400 * Make sure all delayed rcu free inodes are flushed before we
9404 kmem_cache_destroy(btrfs_inode_cachep);
9405 kmem_cache_destroy(btrfs_trans_handle_cachep);
9406 kmem_cache_destroy(btrfs_path_cachep);
9407 kmem_cache_destroy(btrfs_free_space_cachep);
9408 kmem_cache_destroy(btrfs_free_space_bitmap_cachep);
9411 int __init btrfs_init_cachep(void)
9413 btrfs_inode_cachep = kmem_cache_create("btrfs_inode",
9414 sizeof(struct btrfs_inode), 0,
9415 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT,
9417 if (!btrfs_inode_cachep)
9420 btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle",
9421 sizeof(struct btrfs_trans_handle), 0,
9422 SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);
9423 if (!btrfs_trans_handle_cachep)
9426 btrfs_path_cachep = kmem_cache_create("btrfs_path",
9427 sizeof(struct btrfs_path), 0,
9428 SLAB_MEM_SPREAD, NULL);
9429 if (!btrfs_path_cachep)
9432 btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space",
9433 sizeof(struct btrfs_free_space), 0,
9434 SLAB_MEM_SPREAD, NULL);
9435 if (!btrfs_free_space_cachep)
9438 btrfs_free_space_bitmap_cachep = kmem_cache_create("btrfs_free_space_bitmap",
9439 PAGE_SIZE, PAGE_SIZE,
9440 SLAB_RED_ZONE, NULL);
9441 if (!btrfs_free_space_bitmap_cachep)
9446 btrfs_destroy_cachep();
9450 static int btrfs_getattr(const struct path *path, struct kstat *stat,
9451 u32 request_mask, unsigned int flags)
9454 struct inode *inode = d_inode(path->dentry);
9455 u32 blocksize = inode->i_sb->s_blocksize;
9456 u32 bi_flags = BTRFS_I(inode)->flags;
9458 stat->result_mask |= STATX_BTIME;
9459 stat->btime.tv_sec = BTRFS_I(inode)->i_otime.tv_sec;
9460 stat->btime.tv_nsec = BTRFS_I(inode)->i_otime.tv_nsec;
9461 if (bi_flags & BTRFS_INODE_APPEND)
9462 stat->attributes |= STATX_ATTR_APPEND;
9463 if (bi_flags & BTRFS_INODE_COMPRESS)
9464 stat->attributes |= STATX_ATTR_COMPRESSED;
9465 if (bi_flags & BTRFS_INODE_IMMUTABLE)
9466 stat->attributes |= STATX_ATTR_IMMUTABLE;
9467 if (bi_flags & BTRFS_INODE_NODUMP)
9468 stat->attributes |= STATX_ATTR_NODUMP;
9470 stat->attributes_mask |= (STATX_ATTR_APPEND |
9471 STATX_ATTR_COMPRESSED |
9472 STATX_ATTR_IMMUTABLE |
9475 generic_fillattr(inode, stat);
9476 stat->dev = BTRFS_I(inode)->root->anon_dev;
9478 spin_lock(&BTRFS_I(inode)->lock);
9479 delalloc_bytes = BTRFS_I(inode)->new_delalloc_bytes;
9480 spin_unlock(&BTRFS_I(inode)->lock);
9481 stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) +
9482 ALIGN(delalloc_bytes, blocksize)) >> 9;
9486 static int btrfs_rename_exchange(struct inode *old_dir,
9487 struct dentry *old_dentry,
9488 struct inode *new_dir,
9489 struct dentry *new_dentry)
9491 struct btrfs_fs_info *fs_info = btrfs_sb(old_dir->i_sb);
9492 struct btrfs_trans_handle *trans;
9493 struct btrfs_root *root = BTRFS_I(old_dir)->root;
9494 struct btrfs_root *dest = BTRFS_I(new_dir)->root;
9495 struct inode *new_inode = new_dentry->d_inode;
9496 struct inode *old_inode = old_dentry->d_inode;
9497 struct timespec64 ctime = current_time(old_inode);
9498 struct dentry *parent;
9499 u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
9500 u64 new_ino = btrfs_ino(BTRFS_I(new_inode));
9505 bool root_log_pinned = false;
9506 bool dest_log_pinned = false;
9507 struct btrfs_log_ctx ctx_root;
9508 struct btrfs_log_ctx ctx_dest;
9509 bool sync_log_root = false;
9510 bool sync_log_dest = false;
9511 bool commit_transaction = false;
9513 /* we only allow rename subvolume link between subvolumes */
9514 if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
9517 btrfs_init_log_ctx(&ctx_root, old_inode);
9518 btrfs_init_log_ctx(&ctx_dest, new_inode);
9520 /* close the race window with snapshot create/destroy ioctl */
9521 if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
9522 down_read(&fs_info->subvol_sem);
9523 if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
9524 down_read(&fs_info->subvol_sem);
9527 * We want to reserve the absolute worst case amount of items. So if
9528 * both inodes are subvols and we need to unlink them then that would
9529 * require 4 item modifications, but if they are both normal inodes it
9530 * would require 5 item modifications, so we'll assume their normal
9531 * inodes. So 5 * 2 is 10, plus 2 for the new links, so 12 total items
9532 * should cover the worst case number of items we'll modify.
9534 trans = btrfs_start_transaction(root, 12);
9535 if (IS_ERR(trans)) {
9536 ret = PTR_ERR(trans);
9541 * We need to find a free sequence number both in the source and
9542 * in the destination directory for the exchange.
9544 ret = btrfs_set_inode_index(BTRFS_I(new_dir), &old_idx);
9547 ret = btrfs_set_inode_index(BTRFS_I(old_dir), &new_idx);
9551 BTRFS_I(old_inode)->dir_index = 0ULL;
9552 BTRFS_I(new_inode)->dir_index = 0ULL;
9554 /* Reference for the source. */
9555 if (old_ino == BTRFS_FIRST_FREE_OBJECTID) {
9556 /* force full log commit if subvolume involved. */
9557 btrfs_set_log_full_commit(trans);
9559 btrfs_pin_log_trans(root);
9560 root_log_pinned = true;
9561 ret = btrfs_insert_inode_ref(trans, dest,
9562 new_dentry->d_name.name,
9563 new_dentry->d_name.len,
9565 btrfs_ino(BTRFS_I(new_dir)),
9571 /* And now for the dest. */
9572 if (new_ino == BTRFS_FIRST_FREE_OBJECTID) {
9573 /* force full log commit if subvolume involved. */
9574 btrfs_set_log_full_commit(trans);
9576 btrfs_pin_log_trans(dest);
9577 dest_log_pinned = true;
9578 ret = btrfs_insert_inode_ref(trans, root,
9579 old_dentry->d_name.name,
9580 old_dentry->d_name.len,
9582 btrfs_ino(BTRFS_I(old_dir)),
9588 /* Update inode version and ctime/mtime. */
9589 inode_inc_iversion(old_dir);
9590 inode_inc_iversion(new_dir);
9591 inode_inc_iversion(old_inode);
9592 inode_inc_iversion(new_inode);
9593 old_dir->i_ctime = old_dir->i_mtime = ctime;
9594 new_dir->i_ctime = new_dir->i_mtime = ctime;
9595 old_inode->i_ctime = ctime;
9596 new_inode->i_ctime = ctime;
9598 if (old_dentry->d_parent != new_dentry->d_parent) {
9599 btrfs_record_unlink_dir(trans, BTRFS_I(old_dir),
9600 BTRFS_I(old_inode), 1);
9601 btrfs_record_unlink_dir(trans, BTRFS_I(new_dir),
9602 BTRFS_I(new_inode), 1);
9605 /* src is a subvolume */
9606 if (old_ino == BTRFS_FIRST_FREE_OBJECTID) {
9607 root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
9608 ret = btrfs_unlink_subvol(trans, old_dir, root_objectid,
9609 old_dentry->d_name.name,
9610 old_dentry->d_name.len);
9611 } else { /* src is an inode */
9612 ret = __btrfs_unlink_inode(trans, root, BTRFS_I(old_dir),
9613 BTRFS_I(old_dentry->d_inode),
9614 old_dentry->d_name.name,
9615 old_dentry->d_name.len);
9617 ret = btrfs_update_inode(trans, root, old_inode);
9620 btrfs_abort_transaction(trans, ret);
9624 /* dest is a subvolume */
9625 if (new_ino == BTRFS_FIRST_FREE_OBJECTID) {
9626 root_objectid = BTRFS_I(new_inode)->root->root_key.objectid;
9627 ret = btrfs_unlink_subvol(trans, new_dir, root_objectid,
9628 new_dentry->d_name.name,
9629 new_dentry->d_name.len);
9630 } else { /* dest is an inode */
9631 ret = __btrfs_unlink_inode(trans, dest, BTRFS_I(new_dir),
9632 BTRFS_I(new_dentry->d_inode),
9633 new_dentry->d_name.name,
9634 new_dentry->d_name.len);
9636 ret = btrfs_update_inode(trans, dest, new_inode);
9639 btrfs_abort_transaction(trans, ret);
9643 ret = btrfs_add_link(trans, BTRFS_I(new_dir), BTRFS_I(old_inode),
9644 new_dentry->d_name.name,
9645 new_dentry->d_name.len, 0, old_idx);
9647 btrfs_abort_transaction(trans, ret);
9651 ret = btrfs_add_link(trans, BTRFS_I(old_dir), BTRFS_I(new_inode),
9652 old_dentry->d_name.name,
9653 old_dentry->d_name.len, 0, new_idx);
9655 btrfs_abort_transaction(trans, ret);
9659 if (old_inode->i_nlink == 1)
9660 BTRFS_I(old_inode)->dir_index = old_idx;
9661 if (new_inode->i_nlink == 1)
9662 BTRFS_I(new_inode)->dir_index = new_idx;
9664 if (root_log_pinned) {
9665 parent = new_dentry->d_parent;
9666 ret = btrfs_log_new_name(trans, BTRFS_I(old_inode),
9667 BTRFS_I(old_dir), parent,
9669 if (ret == BTRFS_NEED_LOG_SYNC)
9670 sync_log_root = true;
9671 else if (ret == BTRFS_NEED_TRANS_COMMIT)
9672 commit_transaction = true;
9674 btrfs_end_log_trans(root);
9675 root_log_pinned = false;
9677 if (dest_log_pinned) {
9678 if (!commit_transaction) {
9679 parent = old_dentry->d_parent;
9680 ret = btrfs_log_new_name(trans, BTRFS_I(new_inode),
9681 BTRFS_I(new_dir), parent,
9683 if (ret == BTRFS_NEED_LOG_SYNC)
9684 sync_log_dest = true;
9685 else if (ret == BTRFS_NEED_TRANS_COMMIT)
9686 commit_transaction = true;
9689 btrfs_end_log_trans(dest);
9690 dest_log_pinned = false;
9694 * If we have pinned a log and an error happened, we unpin tasks
9695 * trying to sync the log and force them to fallback to a transaction
9696 * commit if the log currently contains any of the inodes involved in
9697 * this rename operation (to ensure we do not persist a log with an
9698 * inconsistent state for any of these inodes or leading to any
9699 * inconsistencies when replayed). If the transaction was aborted, the
9700 * abortion reason is propagated to userspace when attempting to commit
9701 * the transaction. If the log does not contain any of these inodes, we
9702 * allow the tasks to sync it.
9704 if (ret && (root_log_pinned || dest_log_pinned)) {
9705 if (btrfs_inode_in_log(BTRFS_I(old_dir), fs_info->generation) ||
9706 btrfs_inode_in_log(BTRFS_I(new_dir), fs_info->generation) ||
9707 btrfs_inode_in_log(BTRFS_I(old_inode), fs_info->generation) ||
9709 btrfs_inode_in_log(BTRFS_I(new_inode), fs_info->generation)))
9710 btrfs_set_log_full_commit(trans);
9712 if (root_log_pinned) {
9713 btrfs_end_log_trans(root);
9714 root_log_pinned = false;
9716 if (dest_log_pinned) {
9717 btrfs_end_log_trans(dest);
9718 dest_log_pinned = false;
9721 if (!ret && sync_log_root && !commit_transaction) {
9722 ret = btrfs_sync_log(trans, BTRFS_I(old_inode)->root,
9725 commit_transaction = true;
9727 if (!ret && sync_log_dest && !commit_transaction) {
9728 ret = btrfs_sync_log(trans, BTRFS_I(new_inode)->root,
9731 commit_transaction = true;
9733 if (commit_transaction) {
9734 ret = btrfs_commit_transaction(trans);
9738 ret2 = btrfs_end_transaction(trans);
9739 ret = ret ? ret : ret2;
9742 if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
9743 up_read(&fs_info->subvol_sem);
9744 if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
9745 up_read(&fs_info->subvol_sem);
9750 static int btrfs_whiteout_for_rename(struct btrfs_trans_handle *trans,
9751 struct btrfs_root *root,
9753 struct dentry *dentry)
9756 struct inode *inode;
9760 ret = btrfs_find_free_ino(root, &objectid);
9764 inode = btrfs_new_inode(trans, root, dir,
9765 dentry->d_name.name,
9767 btrfs_ino(BTRFS_I(dir)),
9769 S_IFCHR | WHITEOUT_MODE,
9772 if (IS_ERR(inode)) {
9773 ret = PTR_ERR(inode);
9777 inode->i_op = &btrfs_special_inode_operations;
9778 init_special_inode(inode, inode->i_mode,
9781 ret = btrfs_init_inode_security(trans, inode, dir,
9786 ret = btrfs_add_nondir(trans, BTRFS_I(dir), dentry,
9787 BTRFS_I(inode), 0, index);
9791 ret = btrfs_update_inode(trans, root, inode);
9793 unlock_new_inode(inode);
9795 inode_dec_link_count(inode);
9801 static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
9802 struct inode *new_dir, struct dentry *new_dentry,
9805 struct btrfs_fs_info *fs_info = btrfs_sb(old_dir->i_sb);
9806 struct btrfs_trans_handle *trans;
9807 unsigned int trans_num_items;
9808 struct btrfs_root *root = BTRFS_I(old_dir)->root;
9809 struct btrfs_root *dest = BTRFS_I(new_dir)->root;
9810 struct inode *new_inode = d_inode(new_dentry);
9811 struct inode *old_inode = d_inode(old_dentry);
9815 u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
9816 bool log_pinned = false;
9817 struct btrfs_log_ctx ctx;
9818 bool sync_log = false;
9819 bool commit_transaction = false;
9821 if (btrfs_ino(BTRFS_I(new_dir)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
9824 /* we only allow rename subvolume link between subvolumes */
9825 if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
9828 if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID ||
9829 (new_inode && btrfs_ino(BTRFS_I(new_inode)) == BTRFS_FIRST_FREE_OBJECTID))
9832 if (S_ISDIR(old_inode->i_mode) && new_inode &&
9833 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
9837 /* check for collisions, even if the name isn't there */
9838 ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino,
9839 new_dentry->d_name.name,
9840 new_dentry->d_name.len);
9843 if (ret == -EEXIST) {
9845 * eexist without a new_inode */
9846 if (WARN_ON(!new_inode)) {
9850 /* maybe -EOVERFLOW */
9857 * we're using rename to replace one file with another. Start IO on it
9858 * now so we don't add too much work to the end of the transaction
9860 if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size)
9861 filemap_flush(old_inode->i_mapping);
9863 /* close the racy window with snapshot create/destroy ioctl */
9864 if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
9865 down_read(&fs_info->subvol_sem);
9867 * We want to reserve the absolute worst case amount of items. So if
9868 * both inodes are subvols and we need to unlink them then that would
9869 * require 4 item modifications, but if they are both normal inodes it
9870 * would require 5 item modifications, so we'll assume they are normal
9871 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
9872 * should cover the worst case number of items we'll modify.
9873 * If our rename has the whiteout flag, we need more 5 units for the
9874 * new inode (1 inode item, 1 inode ref, 2 dir items and 1 xattr item
9875 * when selinux is enabled).
9877 trans_num_items = 11;
9878 if (flags & RENAME_WHITEOUT)
9879 trans_num_items += 5;
9880 trans = btrfs_start_transaction(root, trans_num_items);
9881 if (IS_ERR(trans)) {
9882 ret = PTR_ERR(trans);
9887 btrfs_record_root_in_trans(trans, dest);
9889 ret = btrfs_set_inode_index(BTRFS_I(new_dir), &index);
9893 BTRFS_I(old_inode)->dir_index = 0ULL;
9894 if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) {
9895 /* force full log commit if subvolume involved. */
9896 btrfs_set_log_full_commit(trans);
9898 btrfs_pin_log_trans(root);
9900 ret = btrfs_insert_inode_ref(trans, dest,
9901 new_dentry->d_name.name,
9902 new_dentry->d_name.len,
9904 btrfs_ino(BTRFS_I(new_dir)), index);
9909 inode_inc_iversion(old_dir);
9910 inode_inc_iversion(new_dir);
9911 inode_inc_iversion(old_inode);
9912 old_dir->i_ctime = old_dir->i_mtime =
9913 new_dir->i_ctime = new_dir->i_mtime =
9914 old_inode->i_ctime = current_time(old_dir);
9916 if (old_dentry->d_parent != new_dentry->d_parent)
9917 btrfs_record_unlink_dir(trans, BTRFS_I(old_dir),
9918 BTRFS_I(old_inode), 1);
9920 if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) {
9921 root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
9922 ret = btrfs_unlink_subvol(trans, old_dir, root_objectid,
9923 old_dentry->d_name.name,
9924 old_dentry->d_name.len);
9926 ret = __btrfs_unlink_inode(trans, root, BTRFS_I(old_dir),
9927 BTRFS_I(d_inode(old_dentry)),
9928 old_dentry->d_name.name,
9929 old_dentry->d_name.len);
9931 ret = btrfs_update_inode(trans, root, old_inode);
9934 btrfs_abort_transaction(trans, ret);
9939 inode_inc_iversion(new_inode);
9940 new_inode->i_ctime = current_time(new_inode);
9941 if (unlikely(btrfs_ino(BTRFS_I(new_inode)) ==
9942 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
9943 root_objectid = BTRFS_I(new_inode)->location.objectid;
9944 ret = btrfs_unlink_subvol(trans, new_dir, root_objectid,
9945 new_dentry->d_name.name,
9946 new_dentry->d_name.len);
9947 BUG_ON(new_inode->i_nlink == 0);
9949 ret = btrfs_unlink_inode(trans, dest, BTRFS_I(new_dir),
9950 BTRFS_I(d_inode(new_dentry)),
9951 new_dentry->d_name.name,
9952 new_dentry->d_name.len);
9954 if (!ret && new_inode->i_nlink == 0)
9955 ret = btrfs_orphan_add(trans,
9956 BTRFS_I(d_inode(new_dentry)));
9958 btrfs_abort_transaction(trans, ret);
9963 ret = btrfs_add_link(trans, BTRFS_I(new_dir), BTRFS_I(old_inode),
9964 new_dentry->d_name.name,
9965 new_dentry->d_name.len, 0, index);
9967 btrfs_abort_transaction(trans, ret);
9971 if (old_inode->i_nlink == 1)
9972 BTRFS_I(old_inode)->dir_index = index;
9975 struct dentry *parent = new_dentry->d_parent;
9977 btrfs_init_log_ctx(&ctx, old_inode);
9978 ret = btrfs_log_new_name(trans, BTRFS_I(old_inode),
9979 BTRFS_I(old_dir), parent,
9981 if (ret == BTRFS_NEED_LOG_SYNC)
9983 else if (ret == BTRFS_NEED_TRANS_COMMIT)
9984 commit_transaction = true;
9986 btrfs_end_log_trans(root);
9990 if (flags & RENAME_WHITEOUT) {
9991 ret = btrfs_whiteout_for_rename(trans, root, old_dir,
9995 btrfs_abort_transaction(trans, ret);
10001 * If we have pinned the log and an error happened, we unpin tasks
10002 * trying to sync the log and force them to fallback to a transaction
10003 * commit if the log currently contains any of the inodes involved in
10004 * this rename operation (to ensure we do not persist a log with an
10005 * inconsistent state for any of these inodes or leading to any
10006 * inconsistencies when replayed). If the transaction was aborted, the
10007 * abortion reason is propagated to userspace when attempting to commit
10008 * the transaction. If the log does not contain any of these inodes, we
10009 * allow the tasks to sync it.
10011 if (ret && log_pinned) {
10012 if (btrfs_inode_in_log(BTRFS_I(old_dir), fs_info->generation) ||
10013 btrfs_inode_in_log(BTRFS_I(new_dir), fs_info->generation) ||
10014 btrfs_inode_in_log(BTRFS_I(old_inode), fs_info->generation) ||
10016 btrfs_inode_in_log(BTRFS_I(new_inode), fs_info->generation)))
10017 btrfs_set_log_full_commit(trans);
10019 btrfs_end_log_trans(root);
10020 log_pinned = false;
10022 if (!ret && sync_log) {
10023 ret = btrfs_sync_log(trans, BTRFS_I(old_inode)->root, &ctx);
10025 commit_transaction = true;
10027 if (commit_transaction) {
10028 ret = btrfs_commit_transaction(trans);
10032 ret2 = btrfs_end_transaction(trans);
10033 ret = ret ? ret : ret2;
10036 if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
10037 up_read(&fs_info->subvol_sem);
10042 static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
10043 struct inode *new_dir, struct dentry *new_dentry,
10044 unsigned int flags)
10046 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
10049 if (flags & RENAME_EXCHANGE)
10050 return btrfs_rename_exchange(old_dir, old_dentry, new_dir,
10053 return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
10056 struct btrfs_delalloc_work {
10057 struct inode *inode;
10058 struct completion completion;
10059 struct list_head list;
10060 struct btrfs_work work;
10063 static void btrfs_run_delalloc_work(struct btrfs_work *work)
10065 struct btrfs_delalloc_work *delalloc_work;
10066 struct inode *inode;
10068 delalloc_work = container_of(work, struct btrfs_delalloc_work,
10070 inode = delalloc_work->inode;
10071 filemap_flush(inode->i_mapping);
10072 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
10073 &BTRFS_I(inode)->runtime_flags))
10074 filemap_flush(inode->i_mapping);
10077 complete(&delalloc_work->completion);
10080 static struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode)
10082 struct btrfs_delalloc_work *work;
10084 work = kmalloc(sizeof(*work), GFP_NOFS);
10088 init_completion(&work->completion);
10089 INIT_LIST_HEAD(&work->list);
10090 work->inode = inode;
10091 btrfs_init_work(&work->work, btrfs_flush_delalloc_helper,
10092 btrfs_run_delalloc_work, NULL, NULL);
10098 * some fairly slow code that needs optimization. This walks the list
10099 * of all the inodes with pending delalloc and forces them to disk.
10101 static int start_delalloc_inodes(struct btrfs_root *root, int nr, bool snapshot)
10103 struct btrfs_inode *binode;
10104 struct inode *inode;
10105 struct btrfs_delalloc_work *work, *next;
10106 struct list_head works;
10107 struct list_head splice;
10110 INIT_LIST_HEAD(&works);
10111 INIT_LIST_HEAD(&splice);
10113 mutex_lock(&root->delalloc_mutex);
10114 spin_lock(&root->delalloc_lock);
10115 list_splice_init(&root->delalloc_inodes, &splice);
10116 while (!list_empty(&splice)) {
10117 binode = list_entry(splice.next, struct btrfs_inode,
10120 list_move_tail(&binode->delalloc_inodes,
10121 &root->delalloc_inodes);
10122 inode = igrab(&binode->vfs_inode);
10124 cond_resched_lock(&root->delalloc_lock);
10127 spin_unlock(&root->delalloc_lock);
10130 set_bit(BTRFS_INODE_SNAPSHOT_FLUSH,
10131 &binode->runtime_flags);
10132 work = btrfs_alloc_delalloc_work(inode);
10138 list_add_tail(&work->list, &works);
10139 btrfs_queue_work(root->fs_info->flush_workers,
10142 if (nr != -1 && ret >= nr)
10145 spin_lock(&root->delalloc_lock);
10147 spin_unlock(&root->delalloc_lock);
10150 list_for_each_entry_safe(work, next, &works, list) {
10151 list_del_init(&work->list);
10152 wait_for_completion(&work->completion);
10156 if (!list_empty(&splice)) {
10157 spin_lock(&root->delalloc_lock);
10158 list_splice_tail(&splice, &root->delalloc_inodes);
10159 spin_unlock(&root->delalloc_lock);
10161 mutex_unlock(&root->delalloc_mutex);
10165 int btrfs_start_delalloc_snapshot(struct btrfs_root *root)
10167 struct btrfs_fs_info *fs_info = root->fs_info;
10170 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
10173 ret = start_delalloc_inodes(root, -1, true);
10179 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr)
10181 struct btrfs_root *root;
10182 struct list_head splice;
10185 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
10188 INIT_LIST_HEAD(&splice);
10190 mutex_lock(&fs_info->delalloc_root_mutex);
10191 spin_lock(&fs_info->delalloc_root_lock);
10192 list_splice_init(&fs_info->delalloc_roots, &splice);
10193 while (!list_empty(&splice) && nr) {
10194 root = list_first_entry(&splice, struct btrfs_root,
10196 root = btrfs_grab_fs_root(root);
10198 list_move_tail(&root->delalloc_root,
10199 &fs_info->delalloc_roots);
10200 spin_unlock(&fs_info->delalloc_root_lock);
10202 ret = start_delalloc_inodes(root, nr, false);
10203 btrfs_put_fs_root(root);
10211 spin_lock(&fs_info->delalloc_root_lock);
10213 spin_unlock(&fs_info->delalloc_root_lock);
10217 if (!list_empty(&splice)) {
10218 spin_lock(&fs_info->delalloc_root_lock);
10219 list_splice_tail(&splice, &fs_info->delalloc_roots);
10220 spin_unlock(&fs_info->delalloc_root_lock);
10222 mutex_unlock(&fs_info->delalloc_root_mutex);
10226 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
10227 const char *symname)
10229 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
10230 struct btrfs_trans_handle *trans;
10231 struct btrfs_root *root = BTRFS_I(dir)->root;
10232 struct btrfs_path *path;
10233 struct btrfs_key key;
10234 struct inode *inode = NULL;
10241 struct btrfs_file_extent_item *ei;
10242 struct extent_buffer *leaf;
10244 name_len = strlen(symname);
10245 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(fs_info))
10246 return -ENAMETOOLONG;
10249 * 2 items for inode item and ref
10250 * 2 items for dir items
10251 * 1 item for updating parent inode item
10252 * 1 item for the inline extent item
10253 * 1 item for xattr if selinux is on
10255 trans = btrfs_start_transaction(root, 7);
10257 return PTR_ERR(trans);
10259 err = btrfs_find_free_ino(root, &objectid);
10263 inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
10264 dentry->d_name.len, btrfs_ino(BTRFS_I(dir)),
10265 objectid, S_IFLNK|S_IRWXUGO, &index);
10266 if (IS_ERR(inode)) {
10267 err = PTR_ERR(inode);
10273 * If the active LSM wants to access the inode during
10274 * d_instantiate it needs these. Smack checks to see
10275 * if the filesystem supports xattrs by looking at the
10278 inode->i_fop = &btrfs_file_operations;
10279 inode->i_op = &btrfs_file_inode_operations;
10280 inode->i_mapping->a_ops = &btrfs_aops;
10281 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
10283 err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
10287 path = btrfs_alloc_path();
10292 key.objectid = btrfs_ino(BTRFS_I(inode));
10294 key.type = BTRFS_EXTENT_DATA_KEY;
10295 datasize = btrfs_file_extent_calc_inline_size(name_len);
10296 err = btrfs_insert_empty_item(trans, root, path, &key,
10299 btrfs_free_path(path);
10302 leaf = path->nodes[0];
10303 ei = btrfs_item_ptr(leaf, path->slots[0],
10304 struct btrfs_file_extent_item);
10305 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
10306 btrfs_set_file_extent_type(leaf, ei,
10307 BTRFS_FILE_EXTENT_INLINE);
10308 btrfs_set_file_extent_encryption(leaf, ei, 0);
10309 btrfs_set_file_extent_compression(leaf, ei, 0);
10310 btrfs_set_file_extent_other_encoding(leaf, ei, 0);
10311 btrfs_set_file_extent_ram_bytes(leaf, ei, name_len);
10313 ptr = btrfs_file_extent_inline_start(ei);
10314 write_extent_buffer(leaf, symname, ptr, name_len);
10315 btrfs_mark_buffer_dirty(leaf);
10316 btrfs_free_path(path);
10318 inode->i_op = &btrfs_symlink_inode_operations;
10319 inode_nohighmem(inode);
10320 inode_set_bytes(inode, name_len);
10321 btrfs_i_size_write(BTRFS_I(inode), name_len);
10322 err = btrfs_update_inode(trans, root, inode);
10324 * Last step, add directory indexes for our symlink inode. This is the
10325 * last step to avoid extra cleanup of these indexes if an error happens
10329 err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry,
10330 BTRFS_I(inode), 0, index);
10334 d_instantiate_new(dentry, inode);
10337 btrfs_end_transaction(trans);
10338 if (err && inode) {
10339 inode_dec_link_count(inode);
10340 discard_new_inode(inode);
10342 btrfs_btree_balance_dirty(fs_info);
10346 static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
10347 u64 start, u64 num_bytes, u64 min_size,
10348 loff_t actual_len, u64 *alloc_hint,
10349 struct btrfs_trans_handle *trans)
10351 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
10352 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
10353 struct extent_map *em;
10354 struct btrfs_root *root = BTRFS_I(inode)->root;
10355 struct btrfs_key ins;
10356 u64 cur_offset = start;
10359 u64 last_alloc = (u64)-1;
10361 bool own_trans = true;
10362 u64 end = start + num_bytes - 1;
10366 while (num_bytes > 0) {
10368 trans = btrfs_start_transaction(root, 3);
10369 if (IS_ERR(trans)) {
10370 ret = PTR_ERR(trans);
10375 cur_bytes = min_t(u64, num_bytes, SZ_256M);
10376 cur_bytes = max(cur_bytes, min_size);
10378 * If we are severely fragmented we could end up with really
10379 * small allocations, so if the allocator is returning small
10380 * chunks lets make its job easier by only searching for those
10383 cur_bytes = min(cur_bytes, last_alloc);
10384 ret = btrfs_reserve_extent(root, cur_bytes, cur_bytes,
10385 min_size, 0, *alloc_hint, &ins, 1, 0);
10388 btrfs_end_transaction(trans);
10391 btrfs_dec_block_group_reservations(fs_info, ins.objectid);
10393 last_alloc = ins.offset;
10394 ret = insert_reserved_file_extent(trans, inode,
10395 cur_offset, ins.objectid,
10396 ins.offset, ins.offset,
10397 ins.offset, 0, 0, 0,
10398 BTRFS_FILE_EXTENT_PREALLOC);
10400 btrfs_free_reserved_extent(fs_info, ins.objectid,
10402 btrfs_abort_transaction(trans, ret);
10404 btrfs_end_transaction(trans);
10408 btrfs_drop_extent_cache(BTRFS_I(inode), cur_offset,
10409 cur_offset + ins.offset -1, 0);
10411 em = alloc_extent_map();
10413 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
10414 &BTRFS_I(inode)->runtime_flags);
10418 em->start = cur_offset;
10419 em->orig_start = cur_offset;
10420 em->len = ins.offset;
10421 em->block_start = ins.objectid;
10422 em->block_len = ins.offset;
10423 em->orig_block_len = ins.offset;
10424 em->ram_bytes = ins.offset;
10425 em->bdev = fs_info->fs_devices->latest_bdev;
10426 set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
10427 em->generation = trans->transid;
10430 write_lock(&em_tree->lock);
10431 ret = add_extent_mapping(em_tree, em, 1);
10432 write_unlock(&em_tree->lock);
10433 if (ret != -EEXIST)
10435 btrfs_drop_extent_cache(BTRFS_I(inode), cur_offset,
10436 cur_offset + ins.offset - 1,
10439 free_extent_map(em);
10441 num_bytes -= ins.offset;
10442 cur_offset += ins.offset;
10443 *alloc_hint = ins.objectid + ins.offset;
10445 inode_inc_iversion(inode);
10446 inode->i_ctime = current_time(inode);
10447 BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
10448 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
10449 (actual_len > inode->i_size) &&
10450 (cur_offset > inode->i_size)) {
10451 if (cur_offset > actual_len)
10452 i_size = actual_len;
10454 i_size = cur_offset;
10455 i_size_write(inode, i_size);
10456 btrfs_ordered_update_i_size(inode, i_size, NULL);
10459 ret = btrfs_update_inode(trans, root, inode);
10462 btrfs_abort_transaction(trans, ret);
10464 btrfs_end_transaction(trans);
10469 btrfs_end_transaction(trans);
10471 if (cur_offset < end)
10472 btrfs_free_reserved_data_space(inode, NULL, cur_offset,
10473 end - cur_offset + 1);
10477 int btrfs_prealloc_file_range(struct inode *inode, int mode,
10478 u64 start, u64 num_bytes, u64 min_size,
10479 loff_t actual_len, u64 *alloc_hint)
10481 return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
10482 min_size, actual_len, alloc_hint,
10486 int btrfs_prealloc_file_range_trans(struct inode *inode,
10487 struct btrfs_trans_handle *trans, int mode,
10488 u64 start, u64 num_bytes, u64 min_size,
10489 loff_t actual_len, u64 *alloc_hint)
10491 return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
10492 min_size, actual_len, alloc_hint, trans);
10495 static int btrfs_set_page_dirty(struct page *page)
10497 return __set_page_dirty_nobuffers(page);
10500 static int btrfs_permission(struct inode *inode, int mask)
10502 struct btrfs_root *root = BTRFS_I(inode)->root;
10503 umode_t mode = inode->i_mode;
10505 if (mask & MAY_WRITE &&
10506 (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
10507 if (btrfs_root_readonly(root))
10509 if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
10512 return generic_permission(inode, mask);
10515 static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
10517 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
10518 struct btrfs_trans_handle *trans;
10519 struct btrfs_root *root = BTRFS_I(dir)->root;
10520 struct inode *inode = NULL;
10526 * 5 units required for adding orphan entry
10528 trans = btrfs_start_transaction(root, 5);
10530 return PTR_ERR(trans);
10532 ret = btrfs_find_free_ino(root, &objectid);
10536 inode = btrfs_new_inode(trans, root, dir, NULL, 0,
10537 btrfs_ino(BTRFS_I(dir)), objectid, mode, &index);
10538 if (IS_ERR(inode)) {
10539 ret = PTR_ERR(inode);
10544 inode->i_fop = &btrfs_file_operations;
10545 inode->i_op = &btrfs_file_inode_operations;
10547 inode->i_mapping->a_ops = &btrfs_aops;
10548 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
10550 ret = btrfs_init_inode_security(trans, inode, dir, NULL);
10554 ret = btrfs_update_inode(trans, root, inode);
10557 ret = btrfs_orphan_add(trans, BTRFS_I(inode));
10562 * We set number of links to 0 in btrfs_new_inode(), and here we set
10563 * it to 1 because d_tmpfile() will issue a warning if the count is 0,
10566 * d_tmpfile() -> inode_dec_link_count() -> drop_nlink()
10568 set_nlink(inode, 1);
10569 d_tmpfile(dentry, inode);
10570 unlock_new_inode(inode);
10571 mark_inode_dirty(inode);
10573 btrfs_end_transaction(trans);
10575 discard_new_inode(inode);
10576 btrfs_btree_balance_dirty(fs_info);
10580 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
10582 struct inode *inode = tree->private_data;
10583 unsigned long index = start >> PAGE_SHIFT;
10584 unsigned long end_index = end >> PAGE_SHIFT;
10587 while (index <= end_index) {
10588 page = find_get_page(inode->i_mapping, index);
10589 ASSERT(page); /* Pages should be in the extent_io_tree */
10590 set_page_writeback(page);
10598 * Add an entry indicating a block group or device which is pinned by a
10599 * swapfile. Returns 0 on success, 1 if there is already an entry for it, or a
10600 * negative errno on failure.
10602 static int btrfs_add_swapfile_pin(struct inode *inode, void *ptr,
10603 bool is_block_group)
10605 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
10606 struct btrfs_swapfile_pin *sp, *entry;
10607 struct rb_node **p;
10608 struct rb_node *parent = NULL;
10610 sp = kmalloc(sizeof(*sp), GFP_NOFS);
10615 sp->is_block_group = is_block_group;
10617 spin_lock(&fs_info->swapfile_pins_lock);
10618 p = &fs_info->swapfile_pins.rb_node;
10621 entry = rb_entry(parent, struct btrfs_swapfile_pin, node);
10622 if (sp->ptr < entry->ptr ||
10623 (sp->ptr == entry->ptr && sp->inode < entry->inode)) {
10624 p = &(*p)->rb_left;
10625 } else if (sp->ptr > entry->ptr ||
10626 (sp->ptr == entry->ptr && sp->inode > entry->inode)) {
10627 p = &(*p)->rb_right;
10629 spin_unlock(&fs_info->swapfile_pins_lock);
10634 rb_link_node(&sp->node, parent, p);
10635 rb_insert_color(&sp->node, &fs_info->swapfile_pins);
10636 spin_unlock(&fs_info->swapfile_pins_lock);
10640 /* Free all of the entries pinned by this swapfile. */
10641 static void btrfs_free_swapfile_pins(struct inode *inode)
10643 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
10644 struct btrfs_swapfile_pin *sp;
10645 struct rb_node *node, *next;
10647 spin_lock(&fs_info->swapfile_pins_lock);
10648 node = rb_first(&fs_info->swapfile_pins);
10650 next = rb_next(node);
10651 sp = rb_entry(node, struct btrfs_swapfile_pin, node);
10652 if (sp->inode == inode) {
10653 rb_erase(&sp->node, &fs_info->swapfile_pins);
10654 if (sp->is_block_group)
10655 btrfs_put_block_group(sp->ptr);
10660 spin_unlock(&fs_info->swapfile_pins_lock);
10663 struct btrfs_swap_info {
10669 unsigned long nr_pages;
10673 static int btrfs_add_swap_extent(struct swap_info_struct *sis,
10674 struct btrfs_swap_info *bsi)
10676 unsigned long nr_pages;
10677 u64 first_ppage, first_ppage_reported, next_ppage;
10680 first_ppage = ALIGN(bsi->block_start, PAGE_SIZE) >> PAGE_SHIFT;
10681 next_ppage = ALIGN_DOWN(bsi->block_start + bsi->block_len,
10682 PAGE_SIZE) >> PAGE_SHIFT;
10684 if (first_ppage >= next_ppage)
10686 nr_pages = next_ppage - first_ppage;
10688 first_ppage_reported = first_ppage;
10689 if (bsi->start == 0)
10690 first_ppage_reported++;
10691 if (bsi->lowest_ppage > first_ppage_reported)
10692 bsi->lowest_ppage = first_ppage_reported;
10693 if (bsi->highest_ppage < (next_ppage - 1))
10694 bsi->highest_ppage = next_ppage - 1;
10696 ret = add_swap_extent(sis, bsi->nr_pages, nr_pages, first_ppage);
10699 bsi->nr_extents += ret;
10700 bsi->nr_pages += nr_pages;
10704 static void btrfs_swap_deactivate(struct file *file)
10706 struct inode *inode = file_inode(file);
10708 btrfs_free_swapfile_pins(inode);
10709 atomic_dec(&BTRFS_I(inode)->root->nr_swapfiles);
10712 static int btrfs_swap_activate(struct swap_info_struct *sis, struct file *file,
10715 struct inode *inode = file_inode(file);
10716 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
10717 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
10718 struct extent_state *cached_state = NULL;
10719 struct extent_map *em = NULL;
10720 struct btrfs_device *device = NULL;
10721 struct btrfs_swap_info bsi = {
10722 .lowest_ppage = (sector_t)-1ULL,
10729 * If the swap file was just created, make sure delalloc is done. If the
10730 * file changes again after this, the user is doing something stupid and
10731 * we don't really care.
10733 ret = btrfs_wait_ordered_range(inode, 0, (u64)-1);
10738 * The inode is locked, so these flags won't change after we check them.
10740 if (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS) {
10741 btrfs_warn(fs_info, "swapfile must not be compressed");
10744 if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW)) {
10745 btrfs_warn(fs_info, "swapfile must not be copy-on-write");
10748 if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
10749 btrfs_warn(fs_info, "swapfile must not be checksummed");
10754 * Balance or device remove/replace/resize can move stuff around from
10755 * under us. The EXCL_OP flag makes sure they aren't running/won't run
10756 * concurrently while we are mapping the swap extents, and
10757 * fs_info->swapfile_pins prevents them from running while the swap file
10758 * is active and moving the extents. Note that this also prevents a
10759 * concurrent device add which isn't actually necessary, but it's not
10760 * really worth the trouble to allow it.
10762 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
10763 btrfs_warn(fs_info,
10764 "cannot activate swapfile while exclusive operation is running");
10768 * Snapshots can create extents which require COW even if NODATACOW is
10769 * set. We use this counter to prevent snapshots. We must increment it
10770 * before walking the extents because we don't want a concurrent
10771 * snapshot to run after we've already checked the extents.
10773 atomic_inc(&BTRFS_I(inode)->root->nr_swapfiles);
10775 isize = ALIGN_DOWN(inode->i_size, fs_info->sectorsize);
10777 lock_extent_bits(io_tree, 0, isize - 1, &cached_state);
10779 while (start < isize) {
10780 u64 logical_block_start, physical_block_start;
10781 struct btrfs_block_group_cache *bg;
10782 u64 len = isize - start;
10784 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
10790 if (em->block_start == EXTENT_MAP_HOLE) {
10791 btrfs_warn(fs_info, "swapfile must not have holes");
10795 if (em->block_start == EXTENT_MAP_INLINE) {
10797 * It's unlikely we'll ever actually find ourselves
10798 * here, as a file small enough to fit inline won't be
10799 * big enough to store more than the swap header, but in
10800 * case something changes in the future, let's catch it
10801 * here rather than later.
10803 btrfs_warn(fs_info, "swapfile must not be inline");
10807 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
10808 btrfs_warn(fs_info, "swapfile must not be compressed");
10813 logical_block_start = em->block_start + (start - em->start);
10814 len = min(len, em->len - (start - em->start));
10815 free_extent_map(em);
10818 ret = can_nocow_extent(inode, start, &len, NULL, NULL, NULL);
10824 btrfs_warn(fs_info,
10825 "swapfile must not be copy-on-write");
10830 em = btrfs_get_chunk_map(fs_info, logical_block_start, len);
10836 if (em->map_lookup->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
10837 btrfs_warn(fs_info,
10838 "swapfile must have single data profile");
10843 if (device == NULL) {
10844 device = em->map_lookup->stripes[0].dev;
10845 ret = btrfs_add_swapfile_pin(inode, device, false);
10850 } else if (device != em->map_lookup->stripes[0].dev) {
10851 btrfs_warn(fs_info, "swapfile must be on one device");
10856 physical_block_start = (em->map_lookup->stripes[0].physical +
10857 (logical_block_start - em->start));
10858 len = min(len, em->len - (logical_block_start - em->start));
10859 free_extent_map(em);
10862 bg = btrfs_lookup_block_group(fs_info, logical_block_start);
10864 btrfs_warn(fs_info,
10865 "could not find block group containing swapfile");
10870 ret = btrfs_add_swapfile_pin(inode, bg, true);
10872 btrfs_put_block_group(bg);
10879 if (bsi.block_len &&
10880 bsi.block_start + bsi.block_len == physical_block_start) {
10881 bsi.block_len += len;
10883 if (bsi.block_len) {
10884 ret = btrfs_add_swap_extent(sis, &bsi);
10889 bsi.block_start = physical_block_start;
10890 bsi.block_len = len;
10897 ret = btrfs_add_swap_extent(sis, &bsi);
10900 if (!IS_ERR_OR_NULL(em))
10901 free_extent_map(em);
10903 unlock_extent_cached(io_tree, 0, isize - 1, &cached_state);
10906 btrfs_swap_deactivate(file);
10908 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
10914 sis->bdev = device->bdev;
10915 *span = bsi.highest_ppage - bsi.lowest_ppage + 1;
10916 sis->max = bsi.nr_pages;
10917 sis->pages = bsi.nr_pages - 1;
10918 sis->highest_bit = bsi.nr_pages - 1;
10919 return bsi.nr_extents;
10922 static void btrfs_swap_deactivate(struct file *file)
10926 static int btrfs_swap_activate(struct swap_info_struct *sis, struct file *file,
10929 return -EOPNOTSUPP;
10933 static const struct inode_operations btrfs_dir_inode_operations = {
10934 .getattr = btrfs_getattr,
10935 .lookup = btrfs_lookup,
10936 .create = btrfs_create,
10937 .unlink = btrfs_unlink,
10938 .link = btrfs_link,
10939 .mkdir = btrfs_mkdir,
10940 .rmdir = btrfs_rmdir,
10941 .rename = btrfs_rename2,
10942 .symlink = btrfs_symlink,
10943 .setattr = btrfs_setattr,
10944 .mknod = btrfs_mknod,
10945 .listxattr = btrfs_listxattr,
10946 .permission = btrfs_permission,
10947 .get_acl = btrfs_get_acl,
10948 .set_acl = btrfs_set_acl,
10949 .update_time = btrfs_update_time,
10950 .tmpfile = btrfs_tmpfile,
10952 static const struct inode_operations btrfs_dir_ro_inode_operations = {
10953 .lookup = btrfs_lookup,
10954 .permission = btrfs_permission,
10955 .update_time = btrfs_update_time,
10958 static const struct file_operations btrfs_dir_file_operations = {
10959 .llseek = generic_file_llseek,
10960 .read = generic_read_dir,
10961 .iterate_shared = btrfs_real_readdir,
10962 .open = btrfs_opendir,
10963 .unlocked_ioctl = btrfs_ioctl,
10964 #ifdef CONFIG_COMPAT
10965 .compat_ioctl = btrfs_compat_ioctl,
10967 .release = btrfs_release_file,
10968 .fsync = btrfs_sync_file,
10971 static const struct extent_io_ops btrfs_extent_io_ops = {
10972 /* mandatory callbacks */
10973 .submit_bio_hook = btrfs_submit_bio_hook,
10974 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
10978 * btrfs doesn't support the bmap operation because swapfiles
10979 * use bmap to make a mapping of extents in the file. They assume
10980 * these extents won't change over the life of the file and they
10981 * use the bmap result to do IO directly to the drive.
10983 * the btrfs bmap call would return logical addresses that aren't
10984 * suitable for IO and they also will change frequently as COW
10985 * operations happen. So, swapfile + btrfs == corruption.
10987 * For now we're avoiding this by dropping bmap.
10989 static const struct address_space_operations btrfs_aops = {
10990 .readpage = btrfs_readpage,
10991 .writepage = btrfs_writepage,
10992 .writepages = btrfs_writepages,
10993 .readpages = btrfs_readpages,
10994 .direct_IO = btrfs_direct_IO,
10995 .invalidatepage = btrfs_invalidatepage,
10996 .releasepage = btrfs_releasepage,
10997 .set_page_dirty = btrfs_set_page_dirty,
10998 .error_remove_page = generic_error_remove_page,
10999 .swap_activate = btrfs_swap_activate,
11000 .swap_deactivate = btrfs_swap_deactivate,
11003 static const struct inode_operations btrfs_file_inode_operations = {
11004 .getattr = btrfs_getattr,
11005 .setattr = btrfs_setattr,
11006 .listxattr = btrfs_listxattr,
11007 .permission = btrfs_permission,
11008 .fiemap = btrfs_fiemap,
11009 .get_acl = btrfs_get_acl,
11010 .set_acl = btrfs_set_acl,
11011 .update_time = btrfs_update_time,
11013 static const struct inode_operations btrfs_special_inode_operations = {
11014 .getattr = btrfs_getattr,
11015 .setattr = btrfs_setattr,
11016 .permission = btrfs_permission,
11017 .listxattr = btrfs_listxattr,
11018 .get_acl = btrfs_get_acl,
11019 .set_acl = btrfs_set_acl,
11020 .update_time = btrfs_update_time,
11022 static const struct inode_operations btrfs_symlink_inode_operations = {
11023 .get_link = page_get_link,
11024 .getattr = btrfs_getattr,
11025 .setattr = btrfs_setattr,
11026 .permission = btrfs_permission,
11027 .listxattr = btrfs_listxattr,
11028 .update_time = btrfs_update_time,
11031 const struct dentry_operations btrfs_dentry_operations = {
11032 .d_delete = btrfs_dentry_delete,