1 // SPDX-License-Identifier: GPL-2.0+
3 * NILFS inode operations.
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
7 * Written by Ryusuke Konishi.
11 #include <linux/buffer_head.h>
12 #include <linux/gfp.h>
13 #include <linux/mpage.h>
14 #include <linux/pagemap.h>
15 #include <linux/writeback.h>
16 #include <linux/uio.h>
17 #include <linux/fiemap.h>
27 * struct nilfs_iget_args - arguments used during comparison between inodes
29 * @cno: checkpoint number
30 * @root: pointer on NILFS root object (mounted checkpoint)
31 * @for_gc: inode for GC flag
33 struct nilfs_iget_args {
36 struct nilfs_root *root;
40 static int nilfs_iget_test(struct inode *inode, void *opaque);
42 void nilfs_inode_add_blocks(struct inode *inode, int n)
44 struct nilfs_root *root = NILFS_I(inode)->i_root;
46 inode_add_bytes(inode, i_blocksize(inode) * n);
48 atomic64_add(n, &root->blocks_count);
51 void nilfs_inode_sub_blocks(struct inode *inode, int n)
53 struct nilfs_root *root = NILFS_I(inode)->i_root;
55 inode_sub_bytes(inode, i_blocksize(inode) * n);
57 atomic64_sub(n, &root->blocks_count);
61 * nilfs_get_block() - get a file block on the filesystem (callback function)
62 * @inode - inode struct of the target file
63 * @blkoff - file block number
64 * @bh_result - buffer head to be mapped on
65 * @create - indicate whether allocating the block or not when it has not
68 * This function does not issue actual read request of the specified data
69 * block. It is done by VFS.
71 int nilfs_get_block(struct inode *inode, sector_t blkoff,
72 struct buffer_head *bh_result, int create)
74 struct nilfs_inode_info *ii = NILFS_I(inode);
75 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
78 unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
80 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
81 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
82 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
83 if (ret >= 0) { /* found */
84 map_bh(bh_result, inode->i_sb, blknum);
86 bh_result->b_size = (ret << inode->i_blkbits);
89 /* data block was not found */
90 if (ret == -ENOENT && create) {
91 struct nilfs_transaction_info ti;
93 bh_result->b_blocknr = 0;
94 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
97 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
98 (unsigned long)bh_result);
99 if (unlikely(err != 0)) {
100 if (err == -EEXIST) {
102 * The get_block() function could be called
103 * from multiple callers for an inode.
104 * However, the page having this block must
105 * be locked in this case.
107 nilfs_warn(inode->i_sb,
108 "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
109 __func__, inode->i_ino,
110 (unsigned long long)blkoff);
113 nilfs_transaction_abort(inode->i_sb);
116 nilfs_mark_inode_dirty_sync(inode);
117 nilfs_transaction_commit(inode->i_sb); /* never fails */
118 /* Error handling should be detailed */
119 set_buffer_new(bh_result);
120 set_buffer_delay(bh_result);
121 map_bh(bh_result, inode->i_sb, 0);
122 /* Disk block number must be changed to proper value */
124 } else if (ret == -ENOENT) {
126 * not found is not error (e.g. hole); must return without
127 * the mapped state flag.
139 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
140 * address_space_operations.
141 * @file - file struct of the file to be read
142 * @page - the page to be read
144 static int nilfs_readpage(struct file *file, struct page *page)
146 return mpage_readpage(page, nilfs_get_block);
149 static void nilfs_readahead(struct readahead_control *rac)
151 mpage_readahead(rac, nilfs_get_block);
154 static int nilfs_writepages(struct address_space *mapping,
155 struct writeback_control *wbc)
157 struct inode *inode = mapping->host;
160 if (sb_rdonly(inode->i_sb)) {
161 nilfs_clear_dirty_pages(mapping, false);
165 if (wbc->sync_mode == WB_SYNC_ALL)
166 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
172 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
174 struct inode *inode = page->mapping->host;
177 if (sb_rdonly(inode->i_sb)) {
179 * It means that filesystem was remounted in read-only
180 * mode because of error or metadata corruption. But we
181 * have dirty pages that try to be flushed in background.
182 * So, here we simply discard this dirty page.
184 nilfs_clear_dirty_page(page, false);
189 redirty_page_for_writepage(wbc, page);
192 if (wbc->sync_mode == WB_SYNC_ALL) {
193 err = nilfs_construct_segment(inode->i_sb);
196 } else if (wbc->for_reclaim)
197 nilfs_flush_segment(inode->i_sb, inode->i_ino);
202 static int nilfs_set_page_dirty(struct page *page)
204 struct inode *inode = page->mapping->host;
205 int ret = __set_page_dirty_nobuffers(page);
207 if (page_has_buffers(page)) {
208 unsigned int nr_dirty = 0;
209 struct buffer_head *bh, *head;
212 * This page is locked by callers, and no other thread
213 * concurrently marks its buffers dirty since they are
214 * only dirtied through routines in fs/buffer.c in
215 * which call sites of mark_buffer_dirty are protected
218 bh = head = page_buffers(page);
220 /* Do not mark hole blocks dirty */
221 if (buffer_dirty(bh) || !buffer_mapped(bh))
224 set_buffer_dirty(bh);
226 } while (bh = bh->b_this_page, bh != head);
229 nilfs_set_file_dirty(inode, nr_dirty);
231 unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
233 nilfs_set_file_dirty(inode, nr_dirty);
238 void nilfs_write_failed(struct address_space *mapping, loff_t to)
240 struct inode *inode = mapping->host;
242 if (to > inode->i_size) {
243 truncate_pagecache(inode, inode->i_size);
244 nilfs_truncate(inode);
248 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
249 loff_t pos, unsigned len, unsigned flags,
250 struct page **pagep, void **fsdata)
253 struct inode *inode = mapping->host;
254 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
259 err = block_write_begin(mapping, pos, len, flags, pagep,
262 nilfs_write_failed(mapping, pos + len);
263 nilfs_transaction_abort(inode->i_sb);
268 static int nilfs_write_end(struct file *file, struct address_space *mapping,
269 loff_t pos, unsigned len, unsigned copied,
270 struct page *page, void *fsdata)
272 struct inode *inode = mapping->host;
273 unsigned int start = pos & (PAGE_SIZE - 1);
274 unsigned int nr_dirty;
277 nr_dirty = nilfs_page_count_clean_buffers(page, start,
279 copied = generic_write_end(file, mapping, pos, len, copied, page,
281 nilfs_set_file_dirty(inode, nr_dirty);
282 err = nilfs_transaction_commit(inode->i_sb);
283 return err ? : copied;
287 nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
289 struct inode *inode = file_inode(iocb->ki_filp);
291 if (iov_iter_rw(iter) == WRITE)
294 /* Needs synchronization with the cleaner */
295 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
298 const struct address_space_operations nilfs_aops = {
299 .writepage = nilfs_writepage,
300 .readpage = nilfs_readpage,
301 .writepages = nilfs_writepages,
302 .set_page_dirty = nilfs_set_page_dirty,
303 .readahead = nilfs_readahead,
304 .write_begin = nilfs_write_begin,
305 .write_end = nilfs_write_end,
306 /* .releasepage = nilfs_releasepage, */
307 .invalidatepage = block_invalidatepage,
308 .direct_IO = nilfs_direct_IO,
309 .is_partially_uptodate = block_is_partially_uptodate,
312 static int nilfs_insert_inode_locked(struct inode *inode,
313 struct nilfs_root *root,
316 struct nilfs_iget_args args = {
317 .ino = ino, .root = root, .cno = 0, .for_gc = 0
320 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
323 struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
325 struct super_block *sb = dir->i_sb;
326 struct the_nilfs *nilfs = sb->s_fs_info;
328 struct nilfs_inode_info *ii;
329 struct nilfs_root *root;
333 inode = new_inode(sb);
334 if (unlikely(!inode))
337 mapping_set_gfp_mask(inode->i_mapping,
338 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
340 root = NILFS_I(dir)->i_root;
342 ii->i_state = BIT(NILFS_I_NEW);
345 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
347 goto failed_ifile_create_inode;
348 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
350 atomic64_inc(&root->inodes_count);
351 inode_init_owner(&init_user_ns, inode, dir, mode);
353 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
355 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
356 err = nilfs_bmap_read(ii->i_bmap, NULL);
358 goto failed_after_creation;
360 set_bit(NILFS_I_BMAP, &ii->i_state);
361 /* No lock is needed; iget() ensures it. */
364 ii->i_flags = nilfs_mask_flags(
365 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
367 /* ii->i_file_acl = 0; */
368 /* ii->i_dir_acl = 0; */
369 ii->i_dir_start_lookup = 0;
370 nilfs_set_inode_flags(inode);
371 spin_lock(&nilfs->ns_next_gen_lock);
372 inode->i_generation = nilfs->ns_next_generation++;
373 spin_unlock(&nilfs->ns_next_gen_lock);
374 if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
376 goto failed_after_creation;
379 err = nilfs_init_acl(inode, dir);
382 * Never occur. When supporting nilfs_init_acl(),
383 * proper cancellation of above jobs should be considered.
385 goto failed_after_creation;
389 failed_after_creation:
391 if (inode->i_state & I_NEW)
392 unlock_new_inode(inode);
394 * raw_inode will be deleted through
395 * nilfs_evict_inode().
399 failed_ifile_create_inode:
400 make_bad_inode(inode);
406 void nilfs_set_inode_flags(struct inode *inode)
408 unsigned int flags = NILFS_I(inode)->i_flags;
409 unsigned int new_fl = 0;
411 if (flags & FS_SYNC_FL)
413 if (flags & FS_APPEND_FL)
415 if (flags & FS_IMMUTABLE_FL)
416 new_fl |= S_IMMUTABLE;
417 if (flags & FS_NOATIME_FL)
419 if (flags & FS_DIRSYNC_FL)
421 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
422 S_NOATIME | S_DIRSYNC);
425 int nilfs_read_inode_common(struct inode *inode,
426 struct nilfs_inode *raw_inode)
428 struct nilfs_inode_info *ii = NILFS_I(inode);
431 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
432 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
433 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
434 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
435 inode->i_size = le64_to_cpu(raw_inode->i_size);
436 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
437 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
438 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
439 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
440 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
441 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
442 if (inode->i_nlink == 0)
443 return -ESTALE; /* this inode is deleted */
445 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
446 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
448 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
449 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
450 0 : le32_to_cpu(raw_inode->i_dir_acl);
452 ii->i_dir_start_lookup = 0;
453 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
455 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
456 S_ISLNK(inode->i_mode)) {
457 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
460 set_bit(NILFS_I_BMAP, &ii->i_state);
461 /* No lock is needed; iget() ensures it. */
466 static int __nilfs_read_inode(struct super_block *sb,
467 struct nilfs_root *root, unsigned long ino,
470 struct the_nilfs *nilfs = sb->s_fs_info;
471 struct buffer_head *bh;
472 struct nilfs_inode *raw_inode;
475 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
476 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
480 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
482 err = nilfs_read_inode_common(inode, raw_inode);
486 if (S_ISREG(inode->i_mode)) {
487 inode->i_op = &nilfs_file_inode_operations;
488 inode->i_fop = &nilfs_file_operations;
489 inode->i_mapping->a_ops = &nilfs_aops;
490 } else if (S_ISDIR(inode->i_mode)) {
491 inode->i_op = &nilfs_dir_inode_operations;
492 inode->i_fop = &nilfs_dir_operations;
493 inode->i_mapping->a_ops = &nilfs_aops;
494 } else if (S_ISLNK(inode->i_mode)) {
495 inode->i_op = &nilfs_symlink_inode_operations;
496 inode_nohighmem(inode);
497 inode->i_mapping->a_ops = &nilfs_aops;
499 inode->i_op = &nilfs_special_inode_operations;
501 inode, inode->i_mode,
502 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
504 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
506 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
507 nilfs_set_inode_flags(inode);
508 mapping_set_gfp_mask(inode->i_mapping,
509 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
513 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
517 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
521 static int nilfs_iget_test(struct inode *inode, void *opaque)
523 struct nilfs_iget_args *args = opaque;
524 struct nilfs_inode_info *ii;
526 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
530 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
531 return !args->for_gc;
533 return args->for_gc && args->cno == ii->i_cno;
536 static int nilfs_iget_set(struct inode *inode, void *opaque)
538 struct nilfs_iget_args *args = opaque;
540 inode->i_ino = args->ino;
542 NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
543 NILFS_I(inode)->i_cno = args->cno;
544 NILFS_I(inode)->i_root = NULL;
546 if (args->root && args->ino == NILFS_ROOT_INO)
547 nilfs_get_root(args->root);
548 NILFS_I(inode)->i_root = args->root;
553 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
556 struct nilfs_iget_args args = {
557 .ino = ino, .root = root, .cno = 0, .for_gc = 0
560 return ilookup5(sb, ino, nilfs_iget_test, &args);
563 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
566 struct nilfs_iget_args args = {
567 .ino = ino, .root = root, .cno = 0, .for_gc = 0
570 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
573 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
579 inode = nilfs_iget_locked(sb, root, ino);
580 if (unlikely(!inode))
581 return ERR_PTR(-ENOMEM);
582 if (!(inode->i_state & I_NEW))
585 err = __nilfs_read_inode(sb, root, ino, inode);
590 unlock_new_inode(inode);
594 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
597 struct nilfs_iget_args args = {
598 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
603 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
604 if (unlikely(!inode))
605 return ERR_PTR(-ENOMEM);
606 if (!(inode->i_state & I_NEW))
609 err = nilfs_init_gcinode(inode);
614 unlock_new_inode(inode);
618 void nilfs_write_inode_common(struct inode *inode,
619 struct nilfs_inode *raw_inode, int has_bmap)
621 struct nilfs_inode_info *ii = NILFS_I(inode);
623 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
624 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
625 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
626 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
627 raw_inode->i_size = cpu_to_le64(inode->i_size);
628 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
629 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
630 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
631 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
632 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
634 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
635 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
637 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
638 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
640 /* zero-fill unused portion in the case of super root block */
641 raw_inode->i_xattr = 0;
642 raw_inode->i_pad = 0;
643 memset((void *)raw_inode + sizeof(*raw_inode), 0,
644 nilfs->ns_inode_size - sizeof(*raw_inode));
648 nilfs_bmap_write(ii->i_bmap, raw_inode);
649 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
650 raw_inode->i_device_code =
651 cpu_to_le64(huge_encode_dev(inode->i_rdev));
653 * When extending inode, nilfs->ns_inode_size should be checked
654 * for substitutions of appended fields.
658 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
660 ino_t ino = inode->i_ino;
661 struct nilfs_inode_info *ii = NILFS_I(inode);
662 struct inode *ifile = ii->i_root->ifile;
663 struct nilfs_inode *raw_inode;
665 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
667 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
668 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
669 if (flags & I_DIRTY_DATASYNC)
670 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
672 nilfs_write_inode_common(inode, raw_inode, 0);
674 * XXX: call with has_bmap = 0 is a workaround to avoid
675 * deadlock of bmap. This delays update of i_bmap to just
679 nilfs_ifile_unmap_inode(ifile, ino, ibh);
682 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
684 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
690 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
693 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
702 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
703 ret = nilfs_bmap_truncate(ii->i_bmap, b);
704 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
705 if (!ret || (ret == -ENOMEM &&
706 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
710 nilfs_warn(ii->vfs_inode.i_sb, "error %d truncating bmap (ino=%lu)",
711 ret, ii->vfs_inode.i_ino);
714 void nilfs_truncate(struct inode *inode)
716 unsigned long blkoff;
717 unsigned int blocksize;
718 struct nilfs_transaction_info ti;
719 struct super_block *sb = inode->i_sb;
720 struct nilfs_inode_info *ii = NILFS_I(inode);
722 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
724 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
727 blocksize = sb->s_blocksize;
728 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
729 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
731 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
733 nilfs_truncate_bmap(ii, blkoff);
735 inode->i_mtime = inode->i_ctime = current_time(inode);
737 nilfs_set_transaction_flag(NILFS_TI_SYNC);
739 nilfs_mark_inode_dirty(inode);
740 nilfs_set_file_dirty(inode, 0);
741 nilfs_transaction_commit(sb);
743 * May construct a logical segment and may fail in sync mode.
744 * But truncate has no return value.
748 static void nilfs_clear_inode(struct inode *inode)
750 struct nilfs_inode_info *ii = NILFS_I(inode);
753 * Free resources allocated in nilfs_read_inode(), here.
755 BUG_ON(!list_empty(&ii->i_dirty));
759 if (nilfs_is_metadata_file_inode(inode))
760 nilfs_mdt_clear(inode);
762 if (test_bit(NILFS_I_BMAP, &ii->i_state))
763 nilfs_bmap_clear(ii->i_bmap);
765 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
767 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
768 nilfs_put_root(ii->i_root);
771 void nilfs_evict_inode(struct inode *inode)
773 struct nilfs_transaction_info ti;
774 struct super_block *sb = inode->i_sb;
775 struct nilfs_inode_info *ii = NILFS_I(inode);
778 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
779 truncate_inode_pages_final(&inode->i_data);
781 nilfs_clear_inode(inode);
784 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
786 truncate_inode_pages_final(&inode->i_data);
788 /* TODO: some of the following operations may fail. */
789 nilfs_truncate_bmap(ii, 0);
790 nilfs_mark_inode_dirty(inode);
793 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
795 atomic64_dec(&ii->i_root->inodes_count);
797 nilfs_clear_inode(inode);
800 nilfs_set_transaction_flag(NILFS_TI_SYNC);
801 nilfs_transaction_commit(sb);
803 * May construct a logical segment and may fail in sync mode.
804 * But delete_inode has no return value.
808 int nilfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
811 struct nilfs_transaction_info ti;
812 struct inode *inode = d_inode(dentry);
813 struct super_block *sb = inode->i_sb;
816 err = setattr_prepare(&init_user_ns, dentry, iattr);
820 err = nilfs_transaction_begin(sb, &ti, 0);
824 if ((iattr->ia_valid & ATTR_SIZE) &&
825 iattr->ia_size != i_size_read(inode)) {
826 inode_dio_wait(inode);
827 truncate_setsize(inode, iattr->ia_size);
828 nilfs_truncate(inode);
831 setattr_copy(&init_user_ns, inode, iattr);
832 mark_inode_dirty(inode);
834 if (iattr->ia_valid & ATTR_MODE) {
835 err = nilfs_acl_chmod(inode);
840 return nilfs_transaction_commit(sb);
843 nilfs_transaction_abort(sb);
847 int nilfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
850 struct nilfs_root *root = NILFS_I(inode)->i_root;
852 if ((mask & MAY_WRITE) && root &&
853 root->cno != NILFS_CPTREE_CURRENT_CNO)
854 return -EROFS; /* snapshot is not writable */
856 return generic_permission(&init_user_ns, inode, mask);
859 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
861 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
862 struct nilfs_inode_info *ii = NILFS_I(inode);
865 spin_lock(&nilfs->ns_inode_lock);
866 if (ii->i_bh == NULL) {
867 spin_unlock(&nilfs->ns_inode_lock);
868 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
872 spin_lock(&nilfs->ns_inode_lock);
873 if (ii->i_bh == NULL)
883 spin_unlock(&nilfs->ns_inode_lock);
887 int nilfs_inode_dirty(struct inode *inode)
889 struct nilfs_inode_info *ii = NILFS_I(inode);
890 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
893 if (!list_empty(&ii->i_dirty)) {
894 spin_lock(&nilfs->ns_inode_lock);
895 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
896 test_bit(NILFS_I_BUSY, &ii->i_state);
897 spin_unlock(&nilfs->ns_inode_lock);
902 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
904 struct nilfs_inode_info *ii = NILFS_I(inode);
905 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
907 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
909 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
912 spin_lock(&nilfs->ns_inode_lock);
913 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
914 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
916 * Because this routine may race with nilfs_dispose_list(),
917 * we have to check NILFS_I_QUEUED here, too.
919 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
921 * This will happen when somebody is freeing
924 nilfs_warn(inode->i_sb,
925 "cannot set file dirty (ino=%lu): the file is being freed",
927 spin_unlock(&nilfs->ns_inode_lock);
929 * NILFS_I_DIRTY may remain for
933 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
934 set_bit(NILFS_I_QUEUED, &ii->i_state);
936 spin_unlock(&nilfs->ns_inode_lock);
940 int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
942 struct buffer_head *ibh;
945 err = nilfs_load_inode_block(inode, &ibh);
947 nilfs_warn(inode->i_sb,
948 "cannot mark inode dirty (ino=%lu): error %d loading inode block",
952 nilfs_update_inode(inode, ibh, flags);
953 mark_buffer_dirty(ibh);
954 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
960 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
961 * @inode: inode of the file to be registered.
963 * nilfs_dirty_inode() loads a inode block containing the specified
964 * @inode and copies data from a nilfs_inode to a corresponding inode
965 * entry in the inode block. This operation is excluded from the segment
966 * construction. This function can be called both as a single operation
967 * and as a part of indivisible file operations.
969 void nilfs_dirty_inode(struct inode *inode, int flags)
971 struct nilfs_transaction_info ti;
972 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
974 if (is_bad_inode(inode)) {
975 nilfs_warn(inode->i_sb,
976 "tried to mark bad_inode dirty. ignored.");
981 nilfs_mdt_mark_dirty(inode);
984 nilfs_transaction_begin(inode->i_sb, &ti, 0);
985 __nilfs_mark_inode_dirty(inode, flags);
986 nilfs_transaction_commit(inode->i_sb); /* never fails */
989 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
990 __u64 start, __u64 len)
992 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
993 __u64 logical = 0, phys = 0, size = 0;
996 sector_t blkoff, end_blkoff;
997 sector_t delalloc_blkoff;
998 unsigned long delalloc_blklen;
999 unsigned int blkbits = inode->i_blkbits;
1002 ret = fiemap_prep(inode, fieinfo, start, &len, 0);
1008 isize = i_size_read(inode);
1010 blkoff = start >> blkbits;
1011 end_blkoff = (start + len - 1) >> blkbits;
1013 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1018 unsigned int maxblocks;
1020 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1022 /* End of the current extent */
1023 ret = fiemap_fill_next_extent(
1024 fieinfo, logical, phys, size, flags);
1028 if (blkoff > end_blkoff)
1031 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1032 logical = blkoff << blkbits;
1034 size = delalloc_blklen << blkbits;
1036 blkoff = delalloc_blkoff + delalloc_blklen;
1037 delalloc_blklen = nilfs_find_uncommitted_extent(
1038 inode, blkoff, &delalloc_blkoff);
1043 * Limit the number of blocks that we look up so as
1044 * not to get into the next delayed allocation extent.
1046 maxblocks = INT_MAX;
1047 if (delalloc_blklen)
1048 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1052 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1053 n = nilfs_bmap_lookup_contig(
1054 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1055 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1060 if (unlikely(n != -ENOENT))
1065 past_eof = ((blkoff << blkbits) >= isize);
1068 /* End of the current extent */
1071 flags |= FIEMAP_EXTENT_LAST;
1073 ret = fiemap_fill_next_extent(
1074 fieinfo, logical, phys, size, flags);
1079 if (blkoff > end_blkoff || past_eof)
1083 if (phys && blkphy << blkbits == phys + size) {
1084 /* The current extent goes on */
1085 size += n << blkbits;
1087 /* Terminate the current extent */
1088 ret = fiemap_fill_next_extent(
1089 fieinfo, logical, phys, size,
1091 if (ret || blkoff > end_blkoff)
1094 /* Start another extent */
1095 flags = FIEMAP_EXTENT_MERGED;
1096 logical = blkoff << blkbits;
1097 phys = blkphy << blkbits;
1098 size = n << blkbits;
1101 /* Start a new extent */
1102 flags = FIEMAP_EXTENT_MERGED;
1103 logical = blkoff << blkbits;
1104 phys = blkphy << blkbits;
1105 size = n << blkbits;
1112 /* If ret is 1 then we just hit the end of the extent array */
1116 inode_unlock(inode);