1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 #include <linux/slab.h>
8 #include <linux/spinlock.h>
9 #include <linux/compat.h>
10 #include <linux/completion.h>
11 #include <linux/buffer_head.h>
12 #include <linux/pagemap.h>
13 #include <linux/uio.h>
14 #include <linux/blkdev.h>
16 #include <linux/mount.h>
18 #include <linux/filelock.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/falloc.h>
21 #include <linux/swap.h>
22 #include <linux/crc32.h>
23 #include <linux/writeback.h>
24 #include <linux/uaccess.h>
25 #include <linux/dlm.h>
26 #include <linux/dlm_plock.h>
27 #include <linux/delay.h>
28 #include <linux/backing-dev.h>
29 #include <linux/fileattr.h>
47 * gfs2_llseek - seek to a location in a file
50 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
52 * SEEK_END requires the glock for the file because it references the
55 * Returns: The new offset, or errno
58 static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
60 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
61 struct gfs2_holder i_gh;
66 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
69 error = generic_file_llseek(file, offset, whence);
70 gfs2_glock_dq_uninit(&i_gh);
75 error = gfs2_seek_data(file, offset);
79 error = gfs2_seek_hole(file, offset);
85 * These don't reference inode->i_size and don't depend on the
86 * block mapping, so we don't need the glock.
88 error = generic_file_llseek(file, offset, whence);
98 * gfs2_readdir - Iterator for a directory
99 * @file: The directory to read from
100 * @ctx: What to feed directory entries to
105 static int gfs2_readdir(struct file *file, struct dir_context *ctx)
107 struct inode *dir = file->f_mapping->host;
108 struct gfs2_inode *dip = GFS2_I(dir);
109 struct gfs2_holder d_gh;
112 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
116 error = gfs2_dir_read(dir, ctx, &file->f_ra);
118 gfs2_glock_dq_uninit(&d_gh);
124 * struct fsflag_gfs2flag
126 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,
127 * and to GFS2_DIF_JDATA for non-directories.
132 } fsflag_gfs2flag[] = {
133 {FS_SYNC_FL, GFS2_DIF_SYNC},
134 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
135 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
136 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
137 {FS_INDEX_FL, GFS2_DIF_EXHASH},
138 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
139 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
142 static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
147 if (S_ISDIR(inode->i_mode))
148 gfsflags &= ~GFS2_DIF_JDATA;
150 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
152 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
153 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
154 fsflags |= fsflag_gfs2flag[i].fsflag;
158 int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
160 struct inode *inode = d_inode(dentry);
161 struct gfs2_inode *ip = GFS2_I(inode);
162 struct gfs2_holder gh;
166 if (d_is_special(dentry))
169 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
170 error = gfs2_glock_nq(&gh);
174 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
176 fileattr_fill_flags(fa, fsflags);
180 gfs2_holder_uninit(&gh);
184 void gfs2_set_inode_flags(struct inode *inode)
186 struct gfs2_inode *ip = GFS2_I(inode);
187 unsigned int flags = inode->i_flags;
189 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
190 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
192 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
193 flags |= S_IMMUTABLE;
194 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
196 if (ip->i_diskflags & GFS2_DIF_NOATIME)
198 if (ip->i_diskflags & GFS2_DIF_SYNC)
200 inode->i_flags = flags;
203 /* Flags that can be set by user space */
204 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
205 GFS2_DIF_IMMUTABLE| \
206 GFS2_DIF_APPENDONLY| \
210 GFS2_DIF_INHERIT_JDATA)
213 * do_gfs2_set_flags - set flags on an inode
215 * @reqflags: The flags to set
216 * @mask: Indicates which flags are valid
219 static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask)
221 struct gfs2_inode *ip = GFS2_I(inode);
222 struct gfs2_sbd *sdp = GFS2_SB(inode);
223 struct buffer_head *bh;
224 struct gfs2_holder gh;
226 u32 new_flags, flags;
228 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
233 flags = ip->i_diskflags;
234 new_flags = (flags & ~mask) | (reqflags & mask);
235 if ((new_flags ^ flags) == 0)
238 if (!IS_IMMUTABLE(inode)) {
239 error = gfs2_permission(&nop_mnt_idmap, inode, MAY_WRITE);
243 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
244 if (new_flags & GFS2_DIF_JDATA)
245 gfs2_log_flush(sdp, ip->i_gl,
246 GFS2_LOG_HEAD_FLUSH_NORMAL |
248 error = filemap_fdatawrite(inode->i_mapping);
251 error = filemap_fdatawait(inode->i_mapping);
254 if (new_flags & GFS2_DIF_JDATA)
255 gfs2_ordered_del_inode(ip);
257 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
260 error = gfs2_meta_inode_buffer(ip, &bh);
263 inode->i_ctime = current_time(inode);
264 gfs2_trans_add_meta(ip->i_gl, bh);
265 ip->i_diskflags = new_flags;
266 gfs2_dinode_out(ip, bh->b_data);
268 gfs2_set_inode_flags(inode);
269 gfs2_set_aops(inode);
273 gfs2_glock_dq_uninit(&gh);
277 int gfs2_fileattr_set(struct mnt_idmap *idmap,
278 struct dentry *dentry, struct fileattr *fa)
280 struct inode *inode = d_inode(dentry);
281 u32 fsflags = fa->flags, gfsflags = 0;
285 if (d_is_special(dentry))
288 if (fileattr_has_fsx(fa))
291 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
292 if (fsflags & fsflag_gfs2flag[i].fsflag) {
293 fsflags &= ~fsflag_gfs2flag[i].fsflag;
294 gfsflags |= fsflag_gfs2flag[i].gfsflag;
297 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
300 mask = GFS2_FLAGS_USER_SET;
301 if (S_ISDIR(inode->i_mode)) {
302 mask &= ~GFS2_DIF_JDATA;
304 /* The GFS2_DIF_TOPDIR flag is only valid for directories. */
305 if (gfsflags & GFS2_DIF_TOPDIR)
307 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
310 return do_gfs2_set_flags(inode, gfsflags, mask);
313 static int gfs2_getlabel(struct file *filp, char __user *label)
315 struct inode *inode = file_inode(filp);
316 struct gfs2_sbd *sdp = GFS2_SB(inode);
318 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
324 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
328 return gfs2_fitrim(filp, (void __user *)arg);
329 case FS_IOC_GETFSLABEL:
330 return gfs2_getlabel(filp, (char __user *)arg);
337 static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
340 /* Keep this list in sync with gfs2_ioctl */
342 case FS_IOC_GETFSLABEL:
348 return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
351 #define gfs2_compat_ioctl NULL
355 * gfs2_size_hint - Give a hint to the size of a write request
356 * @filep: The struct file
357 * @offset: The file offset of the write
358 * @size: The length of the write
360 * When we are about to do a write, this function records the total
361 * write size in order to provide a suitable hint to the lower layers
362 * about how many blocks will be required.
366 static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
368 struct inode *inode = file_inode(filep);
369 struct gfs2_sbd *sdp = GFS2_SB(inode);
370 struct gfs2_inode *ip = GFS2_I(inode);
371 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
372 int hint = min_t(size_t, INT_MAX, blks);
374 if (hint > atomic_read(&ip->i_sizehint))
375 atomic_set(&ip->i_sizehint, hint);
379 * gfs2_allocate_page_backing - Allocate blocks for a write fault
380 * @page: The (locked) page to allocate backing for
381 * @length: Size of the allocation
383 * We try to allocate all the blocks required for the page in one go. This
384 * might fail for various reasons, so we keep trying until all the blocks to
385 * back this page are allocated. If some of the blocks are already allocated,
388 static int gfs2_allocate_page_backing(struct page *page, unsigned int length)
390 u64 pos = page_offset(page);
393 struct iomap iomap = { };
395 if (gfs2_iomap_alloc(page->mapping->host, pos, length, &iomap))
398 if (length < iomap.length)
399 iomap.length = length;
400 length -= iomap.length;
402 } while (length > 0);
408 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
409 * @vmf: The virtual memory fault containing the page to become writable
411 * When the page becomes writable, we need to ensure that we have
412 * blocks allocated on disk to back that page.
415 static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
417 struct page *page = vmf->page;
418 struct inode *inode = file_inode(vmf->vma->vm_file);
419 struct gfs2_inode *ip = GFS2_I(inode);
420 struct gfs2_sbd *sdp = GFS2_SB(inode);
421 struct gfs2_alloc_parms ap = { .aflags = 0, };
422 u64 offset = page_offset(page);
423 unsigned int data_blocks, ind_blocks, rblocks;
424 vm_fault_t ret = VM_FAULT_LOCKED;
425 struct gfs2_holder gh;
430 sb_start_pagefault(inode->i_sb);
432 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
433 err = gfs2_glock_nq(&gh);
435 ret = block_page_mkwrite_return(err);
439 /* Check page index against inode size */
440 size = i_size_read(inode);
441 if (offset >= size) {
442 ret = VM_FAULT_SIGBUS;
446 /* Update file times before taking page lock */
447 file_update_time(vmf->vma->vm_file);
449 /* page is wholly or partially inside EOF */
450 if (size - offset < PAGE_SIZE)
451 length = size - offset;
455 gfs2_size_hint(vmf->vma->vm_file, offset, length);
457 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
458 set_bit(GIF_SW_PAGED, &ip->i_flags);
461 * iomap_writepage / iomap_writepages currently don't support inline
462 * files, so always unstuff here.
465 if (!gfs2_is_stuffed(ip) &&
466 !gfs2_write_alloc_required(ip, offset, length)) {
468 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
469 ret = VM_FAULT_NOPAGE;
475 err = gfs2_rindex_update(sdp);
477 ret = block_page_mkwrite_return(err);
481 gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
482 ap.target = data_blocks + ind_blocks;
483 err = gfs2_quota_lock_check(ip, &ap);
485 ret = block_page_mkwrite_return(err);
488 err = gfs2_inplace_reserve(ip, &ap);
490 ret = block_page_mkwrite_return(err);
491 goto out_quota_unlock;
494 rblocks = RES_DINODE + ind_blocks;
495 if (gfs2_is_jdata(ip))
496 rblocks += data_blocks ? data_blocks : 1;
497 if (ind_blocks || data_blocks) {
498 rblocks += RES_STATFS + RES_QUOTA;
499 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
501 err = gfs2_trans_begin(sdp, rblocks, 0);
503 ret = block_page_mkwrite_return(err);
507 /* Unstuff, if required, and allocate backing blocks for page */
508 if (gfs2_is_stuffed(ip)) {
509 err = gfs2_unstuff_dinode(ip);
511 ret = block_page_mkwrite_return(err);
517 /* If truncated, we must retry the operation, we may have raced
518 * with the glock demotion code.
520 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
521 ret = VM_FAULT_NOPAGE;
522 goto out_page_locked;
525 err = gfs2_allocate_page_backing(page, length);
527 ret = block_page_mkwrite_return(err);
530 if (ret != VM_FAULT_LOCKED)
535 gfs2_inplace_release(ip);
537 gfs2_quota_unlock(ip);
541 gfs2_holder_uninit(&gh);
542 if (ret == VM_FAULT_LOCKED) {
543 set_page_dirty(page);
544 wait_for_stable_page(page);
546 sb_end_pagefault(inode->i_sb);
550 static vm_fault_t gfs2_fault(struct vm_fault *vmf)
552 struct inode *inode = file_inode(vmf->vma->vm_file);
553 struct gfs2_inode *ip = GFS2_I(inode);
554 struct gfs2_holder gh;
558 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
559 err = gfs2_glock_nq(&gh);
561 ret = block_page_mkwrite_return(err);
564 ret = filemap_fault(vmf);
567 gfs2_holder_uninit(&gh);
571 static const struct vm_operations_struct gfs2_vm_ops = {
573 .map_pages = filemap_map_pages,
574 .page_mkwrite = gfs2_page_mkwrite,
579 * @file: The file to map
580 * @vma: The VMA which described the mapping
582 * There is no need to get a lock here unless we should be updating
583 * atime. We ignore any locking errors since the only consequence is
584 * a missed atime update (which will just be deferred until later).
589 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
591 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
593 if (!(file->f_flags & O_NOATIME) &&
594 !IS_NOATIME(&ip->i_inode)) {
595 struct gfs2_holder i_gh;
598 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
602 /* grab lock to update inode */
603 gfs2_glock_dq_uninit(&i_gh);
606 vma->vm_ops = &gfs2_vm_ops;
612 * gfs2_open_common - This is common to open and atomic_open
613 * @inode: The inode being opened
614 * @file: The file being opened
616 * This maybe called under a glock or not depending upon how it has
617 * been called. We must always be called under a glock for regular
618 * files, however. For other file types, it does not matter whether
619 * we hold the glock or not.
621 * Returns: Error code or 0 for success
624 int gfs2_open_common(struct inode *inode, struct file *file)
626 struct gfs2_file *fp;
629 if (S_ISREG(inode->i_mode)) {
630 ret = generic_file_open(inode, file);
635 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
639 mutex_init(&fp->f_fl_mutex);
641 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
642 file->private_data = fp;
643 if (file->f_mode & FMODE_WRITE) {
644 ret = gfs2_qa_get(GFS2_I(inode));
651 kfree(file->private_data);
652 file->private_data = NULL;
657 * gfs2_open - open a file
658 * @inode: the inode to open
659 * @file: the struct file for this opening
661 * After atomic_open, this function is only used for opening files
662 * which are already cached. We must still get the glock for regular
663 * files to ensure that we have the file size uptodate for the large
664 * file check which is in the common code. That is only an issue for
665 * regular files though.
670 static int gfs2_open(struct inode *inode, struct file *file)
672 struct gfs2_inode *ip = GFS2_I(inode);
673 struct gfs2_holder i_gh;
675 bool need_unlock = false;
677 if (S_ISREG(ip->i_inode.i_mode)) {
678 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
685 error = gfs2_open_common(inode, file);
688 gfs2_glock_dq_uninit(&i_gh);
694 * gfs2_release - called to close a struct file
695 * @inode: the inode the struct file belongs to
696 * @file: the struct file being closed
701 static int gfs2_release(struct inode *inode, struct file *file)
703 struct gfs2_inode *ip = GFS2_I(inode);
705 kfree(file->private_data);
706 file->private_data = NULL;
708 if (file->f_mode & FMODE_WRITE) {
709 if (gfs2_rs_active(&ip->i_res))
717 * gfs2_fsync - sync the dirty data for a file (across the cluster)
718 * @file: the file that points to the dentry
719 * @start: the start position in the file to sync
720 * @end: the end position in the file to sync
721 * @datasync: set if we can ignore timestamp changes
723 * We split the data flushing here so that we don't wait for the data
724 * until after we've also sent the metadata to disk. Note that for
725 * data=ordered, we will write & wait for the data at the log flush
726 * stage anyway, so this is unlikely to make much of a difference
727 * except in the data=writeback case.
729 * If the fdatawrite fails due to any reason except -EIO, we will
730 * continue the remainder of the fsync, although we'll still report
731 * the error at the end. This is to match filemap_write_and_wait_range()
737 static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
740 struct address_space *mapping = file->f_mapping;
741 struct inode *inode = mapping->host;
742 int sync_state = inode->i_state & I_DIRTY;
743 struct gfs2_inode *ip = GFS2_I(inode);
744 int ret = 0, ret1 = 0;
746 if (mapping->nrpages) {
747 ret1 = filemap_fdatawrite_range(mapping, start, end);
752 if (!gfs2_is_jdata(ip))
753 sync_state &= ~I_DIRTY_PAGES;
755 sync_state &= ~I_DIRTY_SYNC;
758 ret = sync_inode_metadata(inode, 1);
761 if (gfs2_is_jdata(ip))
762 ret = file_write_and_wait(file);
765 gfs2_ail_flush(ip->i_gl, 1);
768 if (mapping->nrpages)
769 ret = file_fdatawait_range(file, start, end);
771 return ret ? ret : ret1;
774 static inline bool should_fault_in_pages(struct iov_iter *i,
779 size_t count = iov_iter_count(i);
784 if (!user_backed_iter(i))
788 offs = offset_in_page(iocb->ki_pos);
789 if (*prev_count != count || !*window_size) {
792 nr_dirtied = max(current->nr_dirtied_pause -
793 current->nr_dirtied, 8);
794 size = min_t(size_t, SZ_1M, nr_dirtied << PAGE_SHIFT);
798 *window_size = size - offs;
802 static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to,
803 struct gfs2_holder *gh)
805 struct file *file = iocb->ki_filp;
806 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
807 size_t prev_count = 0, window_size = 0;
812 * In this function, we disable page faults when we're holding the
813 * inode glock while doing I/O. If a page fault occurs, we indicate
814 * that the inode glock may be dropped, fault in the pages manually,
817 * Unlike generic_file_read_iter, for reads, iomap_dio_rw can trigger
818 * physical as well as manual page faults, and we need to disable both
821 * For direct I/O, gfs2 takes the inode glock in deferred mode. This
822 * locking mode is compatible with other deferred holders, so multiple
823 * processes and nodes can do direct I/O to a file at the same time.
824 * There's no guarantee that reads or writes will be atomic. Any
825 * coordination among readers and writers needs to happen externally.
828 if (!iov_iter_count(to))
829 return 0; /* skip atime */
831 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
833 ret = gfs2_glock_nq(gh);
838 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
839 IOMAP_DIO_PARTIAL, NULL, read);
842 if (ret <= 0 && ret != -EFAULT)
844 /* No increment (+=) because iomap_dio_rw returns a cumulative value. */
848 if (should_fault_in_pages(to, iocb, &prev_count, &window_size)) {
850 window_size -= fault_in_iov_iter_writeable(to, window_size);
855 if (gfs2_holder_queued(gh))
858 gfs2_holder_uninit(gh);
859 /* User space doesn't expect partial success. */
865 static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
866 struct gfs2_holder *gh)
868 struct file *file = iocb->ki_filp;
869 struct inode *inode = file->f_mapping->host;
870 struct gfs2_inode *ip = GFS2_I(inode);
871 size_t prev_count = 0, window_size = 0;
876 * In this function, we disable page faults when we're holding the
877 * inode glock while doing I/O. If a page fault occurs, we indicate
878 * that the inode glock may be dropped, fault in the pages manually,
881 * For writes, iomap_dio_rw only triggers manual page faults, so we
882 * don't need to disable physical ones.
886 * Deferred lock, even if its a write, since we do no allocation on
887 * this path. All we need to change is the atime, and this lock mode
888 * ensures that other nodes have flushed their buffered read caches
889 * (i.e. their page cache entries for this inode). We do not,
890 * unfortunately, have the option of only flushing a range like the
893 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
895 ret = gfs2_glock_nq(gh);
898 /* Silently fall back to buffered I/O when writing beyond EOF */
899 if (iocb->ki_pos + iov_iter_count(from) > i_size_read(&ip->i_inode))
902 from->nofault = true;
903 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
904 IOMAP_DIO_PARTIAL, NULL, written);
905 from->nofault = false;
912 /* No increment (+=) because iomap_dio_rw returns a cumulative value. */
916 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
918 window_size -= fault_in_iov_iter_readable(from, window_size);
923 if (gfs2_holder_queued(gh))
926 gfs2_holder_uninit(gh);
927 /* User space doesn't expect partial success. */
933 static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
935 struct gfs2_inode *ip;
936 struct gfs2_holder gh;
937 size_t prev_count = 0, window_size = 0;
942 * In this function, we disable page faults when we're holding the
943 * inode glock while doing I/O. If a page fault occurs, we indicate
944 * that the inode glock may be dropped, fault in the pages manually,
948 if (iocb->ki_flags & IOCB_DIRECT)
949 return gfs2_file_direct_read(iocb, to, &gh);
952 iocb->ki_flags |= IOCB_NOIO;
953 ret = generic_file_read_iter(iocb, to);
954 iocb->ki_flags &= ~IOCB_NOIO;
957 if (!iov_iter_count(to))
960 } else if (ret != -EFAULT) {
963 if (iocb->ki_flags & IOCB_NOWAIT)
966 ip = GFS2_I(iocb->ki_filp->f_mapping->host);
967 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
969 ret = gfs2_glock_nq(&gh);
973 ret = generic_file_read_iter(iocb, to);
975 if (ret <= 0 && ret != -EFAULT)
980 if (should_fault_in_pages(to, iocb, &prev_count, &window_size)) {
982 window_size -= fault_in_iov_iter_writeable(to, window_size);
987 if (gfs2_holder_queued(&gh))
990 gfs2_holder_uninit(&gh);
991 return read ? read : ret;
994 static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
995 struct iov_iter *from,
996 struct gfs2_holder *gh)
998 struct file *file = iocb->ki_filp;
999 struct inode *inode = file_inode(file);
1000 struct gfs2_inode *ip = GFS2_I(inode);
1001 struct gfs2_sbd *sdp = GFS2_SB(inode);
1002 struct gfs2_holder *statfs_gh = NULL;
1003 size_t prev_count = 0, window_size = 0;
1004 size_t orig_count = iov_iter_count(from);
1009 * In this function, we disable page faults when we're holding the
1010 * inode glock while doing I/O. If a page fault occurs, we indicate
1011 * that the inode glock may be dropped, fault in the pages manually,
1015 if (inode == sdp->sd_rindex) {
1016 statfs_gh = kmalloc(sizeof(*statfs_gh), GFP_NOFS);
1021 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, gh);
1023 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
1024 window_size -= fault_in_iov_iter_readable(from, window_size);
1029 from->count = min(from->count, window_size);
1031 ret = gfs2_glock_nq(gh);
1035 if (inode == sdp->sd_rindex) {
1036 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
1038 ret = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
1039 GL_NOCACHE, statfs_gh);
1044 current->backing_dev_info = inode_to_bdi(inode);
1045 pagefault_disable();
1046 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
1048 current->backing_dev_info = NULL;
1050 iocb->ki_pos += ret;
1054 if (inode == sdp->sd_rindex)
1055 gfs2_glock_dq_uninit(statfs_gh);
1057 if (ret <= 0 && ret != -EFAULT)
1060 from->count = orig_count - written;
1061 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
1066 if (gfs2_holder_queued(gh))
1069 gfs2_holder_uninit(gh);
1071 from->count = orig_count - written;
1072 return written ? written : ret;
1076 * gfs2_file_write_iter - Perform a write to a file
1077 * @iocb: The io context
1078 * @from: The data to write
1080 * We have to do a lock/unlock here to refresh the inode size for
1081 * O_APPEND writes, otherwise we can land up writing at the wrong
1082 * offset. There is still a race, but provided the app is using its
1083 * own file locking, this will make O_APPEND work as expected.
1087 static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1089 struct file *file = iocb->ki_filp;
1090 struct inode *inode = file_inode(file);
1091 struct gfs2_inode *ip = GFS2_I(inode);
1092 struct gfs2_holder gh;
1095 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
1097 if (iocb->ki_flags & IOCB_APPEND) {
1098 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1101 gfs2_glock_dq_uninit(&gh);
1105 ret = generic_write_checks(iocb, from);
1109 ret = file_remove_privs(file);
1113 ret = file_update_time(file);
1117 if (iocb->ki_flags & IOCB_DIRECT) {
1118 struct address_space *mapping = file->f_mapping;
1119 ssize_t buffered, ret2;
1121 ret = gfs2_file_direct_write(iocb, from, &gh);
1122 if (ret < 0 || !iov_iter_count(from))
1125 iocb->ki_flags |= IOCB_DSYNC;
1126 buffered = gfs2_file_buffered_write(iocb, from, &gh);
1127 if (unlikely(buffered <= 0)) {
1134 * We need to ensure that the page cache pages are written to
1135 * disk and invalidated to preserve the expected O_DIRECT
1136 * semantics. If the writeback or invalidate fails, only report
1137 * the direct I/O range as we don't know if the buffered pages
1140 ret2 = generic_write_sync(iocb, buffered);
1141 invalidate_mapping_pages(mapping,
1142 (iocb->ki_pos - buffered) >> PAGE_SHIFT,
1143 (iocb->ki_pos - 1) >> PAGE_SHIFT);
1144 if (!ret || ret2 > 0)
1147 ret = gfs2_file_buffered_write(iocb, from, &gh);
1148 if (likely(ret > 0))
1149 ret = generic_write_sync(iocb, ret);
1153 inode_unlock(inode);
1157 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
1160 struct super_block *sb = inode->i_sb;
1161 struct gfs2_inode *ip = GFS2_I(inode);
1162 loff_t end = offset + len;
1163 struct buffer_head *dibh;
1166 error = gfs2_meta_inode_buffer(ip, &dibh);
1167 if (unlikely(error))
1170 gfs2_trans_add_meta(ip->i_gl, dibh);
1172 if (gfs2_is_stuffed(ip)) {
1173 error = gfs2_unstuff_dinode(ip);
1174 if (unlikely(error))
1178 while (offset < end) {
1179 struct iomap iomap = { };
1181 error = gfs2_iomap_alloc(inode, offset, end - offset, &iomap);
1184 offset = iomap.offset + iomap.length;
1185 if (!(iomap.flags & IOMAP_F_NEW))
1187 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
1188 iomap.length >> inode->i_blkbits,
1191 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
1201 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
1202 * blocks, determine how many bytes can be written.
1203 * @ip: The inode in question.
1204 * @len: Max cap of bytes. What we return in *len must be <= this.
1205 * @data_blocks: Compute and return the number of data blocks needed
1206 * @ind_blocks: Compute and return the number of indirect blocks needed
1207 * @max_blocks: The total blocks available to work with.
1209 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
1211 static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
1212 unsigned int *data_blocks, unsigned int *ind_blocks,
1213 unsigned int max_blocks)
1216 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1217 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
1219 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
1220 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1224 *data_blocks = max_data;
1225 *ind_blocks = max_blocks - max_data;
1226 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
1229 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
1233 static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1235 struct inode *inode = file_inode(file);
1236 struct gfs2_sbd *sdp = GFS2_SB(inode);
1237 struct gfs2_inode *ip = GFS2_I(inode);
1238 struct gfs2_alloc_parms ap = { .aflags = 0, };
1239 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1240 loff_t bytes, max_bytes, max_blks;
1242 const loff_t pos = offset;
1243 const loff_t count = len;
1244 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
1245 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1246 loff_t max_chunk_size = UINT_MAX & bsize_mask;
1248 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1250 offset &= bsize_mask;
1252 len = next - offset;
1253 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1256 bytes &= bsize_mask;
1258 bytes = sdp->sd_sb.sb_bsize;
1260 gfs2_size_hint(file, offset, len);
1262 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
1263 ap.min_target = data_blocks + ind_blocks;
1268 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1274 /* We need to determine how many bytes we can actually
1275 * fallocate without exceeding quota or going over the
1276 * end of the fs. We start off optimistically by assuming
1277 * we can write max_bytes */
1278 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1280 /* Since max_bytes is most likely a theoretical max, we
1281 * calculate a more realistic 'bytes' to serve as a good
1282 * starting point for the number of bytes we may be able
1284 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1285 ap.target = data_blocks + ind_blocks;
1287 error = gfs2_quota_lock_check(ip, &ap);
1290 /* ap.allowed tells us how many blocks quota will allow
1291 * us to write. Check if this reduces max_blks */
1292 max_blks = UINT_MAX;
1294 max_blks = ap.allowed;
1296 error = gfs2_inplace_reserve(ip, &ap);
1300 /* check if the selected rgrp limits our max_blks further */
1301 if (ip->i_res.rs_reserved < max_blks)
1302 max_blks = ip->i_res.rs_reserved;
1304 /* Almost done. Calculate bytes that can be written using
1305 * max_blks. We also recompute max_bytes, data_blocks and
1307 calc_max_reserv(ip, &max_bytes, &data_blocks,
1308 &ind_blocks, max_blks);
1310 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1311 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1312 if (gfs2_is_jdata(ip))
1313 rblocks += data_blocks ? data_blocks : 1;
1315 error = gfs2_trans_begin(sdp, rblocks,
1316 PAGE_SIZE >> inode->i_blkbits);
1318 goto out_trans_fail;
1320 error = fallocate_chunk(inode, offset, max_bytes, mode);
1321 gfs2_trans_end(sdp);
1324 goto out_trans_fail;
1327 offset += max_bytes;
1328 gfs2_inplace_release(ip);
1329 gfs2_quota_unlock(ip);
1332 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1333 i_size_write(inode, pos + count);
1334 file_update_time(file);
1335 mark_inode_dirty(inode);
1337 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1338 return vfs_fsync_range(file, pos, pos + count - 1,
1339 (file->f_flags & __O_SYNC) ? 0 : 1);
1343 gfs2_inplace_release(ip);
1345 gfs2_quota_unlock(ip);
1349 static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1351 struct inode *inode = file_inode(file);
1352 struct gfs2_sbd *sdp = GFS2_SB(inode);
1353 struct gfs2_inode *ip = GFS2_I(inode);
1354 struct gfs2_holder gh;
1357 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1359 /* fallocate is needed by gfs2_grow to reserve space in the rindex */
1360 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1365 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1366 ret = gfs2_glock_nq(&gh);
1370 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1371 (offset + len) > inode->i_size) {
1372 ret = inode_newsize_ok(inode, offset + len);
1377 ret = get_write_access(inode);
1381 if (mode & FALLOC_FL_PUNCH_HOLE) {
1382 ret = __gfs2_punch_hole(file, offset, len);
1384 ret = __gfs2_fallocate(file, mode, offset, len);
1386 gfs2_rs_deltree(&ip->i_res);
1389 put_write_access(inode);
1393 gfs2_holder_uninit(&gh);
1394 inode_unlock(inode);
1398 static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1399 struct file *out, loff_t *ppos,
1400 size_t len, unsigned int flags)
1404 gfs2_size_hint(out, *ppos, len);
1406 ret = iter_file_splice_write(pipe, out, ppos, len, flags);
1410 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1413 * gfs2_lock - acquire/release a posix lock on a file
1414 * @file: the file pointer
1415 * @cmd: either modify or retrieve lock state, possibly wait
1416 * @fl: type and range of lock
1421 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1423 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1424 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1425 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1427 if (!(fl->fl_flags & FL_POSIX))
1429 if (cmd == F_CANCELLK) {
1432 fl->fl_type = F_UNLCK;
1434 if (unlikely(gfs2_withdrawn(sdp))) {
1435 if (fl->fl_type == F_UNLCK)
1436 locks_lock_file_wait(file, fl);
1440 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1441 else if (fl->fl_type == F_UNLCK)
1442 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1444 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1447 static void __flock_holder_uninit(struct file *file, struct gfs2_holder *fl_gh)
1449 struct gfs2_glock *gl = gfs2_glock_hold(fl_gh->gh_gl);
1452 * Make sure gfs2_glock_put() won't sleep under the file->f_lock
1456 spin_lock(&file->f_lock);
1457 gfs2_holder_uninit(fl_gh);
1458 spin_unlock(&file->f_lock);
1462 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1464 struct gfs2_file *fp = file->private_data;
1465 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1466 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1467 struct gfs2_glock *gl;
1473 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1474 flags = GL_EXACT | GL_NOPID;
1475 if (!IS_SETLKW(cmd))
1476 flags |= LM_FLAG_TRY_1CB;
1478 mutex_lock(&fp->f_fl_mutex);
1480 if (gfs2_holder_initialized(fl_gh)) {
1481 struct file_lock request;
1482 if (fl_gh->gh_state == state)
1484 locks_init_lock(&request);
1485 request.fl_type = F_UNLCK;
1486 request.fl_flags = FL_FLOCK;
1487 locks_lock_file_wait(file, &request);
1488 gfs2_glock_dq(fl_gh);
1489 gfs2_holder_reinit(state, flags, fl_gh);
1491 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1492 &gfs2_flock_glops, CREATE, &gl);
1495 spin_lock(&file->f_lock);
1496 gfs2_holder_init(gl, state, flags, fl_gh);
1497 spin_unlock(&file->f_lock);
1500 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1501 error = gfs2_glock_nq(fl_gh);
1502 if (error != GLR_TRYFAILED)
1504 fl_gh->gh_flags &= ~LM_FLAG_TRY_1CB;
1505 fl_gh->gh_flags |= LM_FLAG_TRY;
1509 __flock_holder_uninit(file, fl_gh);
1510 if (error == GLR_TRYFAILED)
1513 error = locks_lock_file_wait(file, fl);
1514 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1518 mutex_unlock(&fp->f_fl_mutex);
1522 static void do_unflock(struct file *file, struct file_lock *fl)
1524 struct gfs2_file *fp = file->private_data;
1525 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1527 mutex_lock(&fp->f_fl_mutex);
1528 locks_lock_file_wait(file, fl);
1529 if (gfs2_holder_initialized(fl_gh)) {
1530 gfs2_glock_dq(fl_gh);
1531 __flock_holder_uninit(file, fl_gh);
1533 mutex_unlock(&fp->f_fl_mutex);
1537 * gfs2_flock - acquire/release a flock lock on a file
1538 * @file: the file pointer
1539 * @cmd: either modify or retrieve lock state, possibly wait
1540 * @fl: type and range of lock
1545 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1547 if (!(fl->fl_flags & FL_FLOCK))
1550 if (fl->fl_type == F_UNLCK) {
1551 do_unflock(file, fl);
1554 return do_flock(file, cmd, fl);
1558 const struct file_operations gfs2_file_fops = {
1559 .llseek = gfs2_llseek,
1560 .read_iter = gfs2_file_read_iter,
1561 .write_iter = gfs2_file_write_iter,
1562 .iopoll = iocb_bio_iopoll,
1563 .unlocked_ioctl = gfs2_ioctl,
1564 .compat_ioctl = gfs2_compat_ioctl,
1567 .release = gfs2_release,
1568 .fsync = gfs2_fsync,
1570 .flock = gfs2_flock,
1571 .splice_read = generic_file_splice_read,
1572 .splice_write = gfs2_file_splice_write,
1573 .setlease = simple_nosetlease,
1574 .fallocate = gfs2_fallocate,
1577 const struct file_operations gfs2_dir_fops = {
1578 .iterate_shared = gfs2_readdir,
1579 .unlocked_ioctl = gfs2_ioctl,
1580 .compat_ioctl = gfs2_compat_ioctl,
1582 .release = gfs2_release,
1583 .fsync = gfs2_fsync,
1585 .flock = gfs2_flock,
1586 .llseek = default_llseek,
1589 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1591 const struct file_operations gfs2_file_fops_nolock = {
1592 .llseek = gfs2_llseek,
1593 .read_iter = gfs2_file_read_iter,
1594 .write_iter = gfs2_file_write_iter,
1595 .iopoll = iocb_bio_iopoll,
1596 .unlocked_ioctl = gfs2_ioctl,
1597 .compat_ioctl = gfs2_compat_ioctl,
1600 .release = gfs2_release,
1601 .fsync = gfs2_fsync,
1602 .splice_read = generic_file_splice_read,
1603 .splice_write = gfs2_file_splice_write,
1604 .setlease = generic_setlease,
1605 .fallocate = gfs2_fallocate,
1608 const struct file_operations gfs2_dir_fops_nolock = {
1609 .iterate_shared = gfs2_readdir,
1610 .unlocked_ioctl = gfs2_ioctl,
1611 .compat_ioctl = gfs2_compat_ioctl,
1613 .release = gfs2_release,
1614 .fsync = gfs2_fsync,
1615 .llseek = default_llseek,