1 // SPDX-License-Identifier: GPL-2.0
3 * Simple file system for zoned block devices exposing zones as files.
5 * Copyright (C) 2022 Western Digital Corporation or its affiliates.
7 #include <linux/module.h>
8 #include <linux/pagemap.h>
9 #include <linux/iomap.h>
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/blkdev.h>
13 #include <linux/statfs.h>
14 #include <linux/writeback.h>
15 #include <linux/quotaops.h>
16 #include <linux/seq_file.h>
17 #include <linux/parser.h>
18 #include <linux/uio.h>
19 #include <linux/mman.h>
20 #include <linux/sched/mm.h>
21 #include <linux/task_io_accounting_ops.h>
27 static int zonefs_read_iomap_begin(struct inode *inode, loff_t offset,
28 loff_t length, unsigned int flags,
29 struct iomap *iomap, struct iomap *srcmap)
31 struct zonefs_inode_info *zi = ZONEFS_I(inode);
32 struct zonefs_zone *z = zonefs_inode_zone(inode);
33 struct super_block *sb = inode->i_sb;
37 * All blocks are always mapped below EOF. If reading past EOF,
38 * act as if there is a hole up to the file maximum size.
40 mutex_lock(&zi->i_truncate_mutex);
41 iomap->bdev = inode->i_sb->s_bdev;
42 iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
43 isize = i_size_read(inode);
44 if (iomap->offset >= isize) {
45 iomap->type = IOMAP_HOLE;
46 iomap->addr = IOMAP_NULL_ADDR;
47 iomap->length = length;
49 iomap->type = IOMAP_MAPPED;
50 iomap->addr = (z->z_sector << SECTOR_SHIFT) + iomap->offset;
51 iomap->length = isize - iomap->offset;
53 mutex_unlock(&zi->i_truncate_mutex);
55 trace_zonefs_iomap_begin(inode, iomap);
60 static const struct iomap_ops zonefs_read_iomap_ops = {
61 .iomap_begin = zonefs_read_iomap_begin,
64 static int zonefs_write_iomap_begin(struct inode *inode, loff_t offset,
65 loff_t length, unsigned int flags,
66 struct iomap *iomap, struct iomap *srcmap)
68 struct zonefs_inode_info *zi = ZONEFS_I(inode);
69 struct zonefs_zone *z = zonefs_inode_zone(inode);
70 struct super_block *sb = inode->i_sb;
73 /* All write I/Os should always be within the file maximum size */
74 if (WARN_ON_ONCE(offset + length > z->z_capacity))
78 * Sequential zones can only accept direct writes. This is already
79 * checked when writes are issued, so warn if we see a page writeback
82 if (WARN_ON_ONCE(zonefs_zone_is_seq(z) && !(flags & IOMAP_DIRECT)))
86 * For conventional zones, all blocks are always mapped. For sequential
87 * zones, all blocks after always mapped below the inode size (zone
88 * write pointer) and unwriten beyond.
90 mutex_lock(&zi->i_truncate_mutex);
91 iomap->bdev = inode->i_sb->s_bdev;
92 iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
93 iomap->addr = (z->z_sector << SECTOR_SHIFT) + iomap->offset;
94 isize = i_size_read(inode);
95 if (iomap->offset >= isize) {
96 iomap->type = IOMAP_UNWRITTEN;
97 iomap->length = z->z_capacity - iomap->offset;
99 iomap->type = IOMAP_MAPPED;
100 iomap->length = isize - iomap->offset;
102 mutex_unlock(&zi->i_truncate_mutex);
104 trace_zonefs_iomap_begin(inode, iomap);
109 static const struct iomap_ops zonefs_write_iomap_ops = {
110 .iomap_begin = zonefs_write_iomap_begin,
113 static int zonefs_read_folio(struct file *unused, struct folio *folio)
115 return iomap_read_folio(folio, &zonefs_read_iomap_ops);
118 static void zonefs_readahead(struct readahead_control *rac)
120 iomap_readahead(rac, &zonefs_read_iomap_ops);
124 * Map blocks for page writeback. This is used only on conventional zone files,
125 * which implies that the page range can only be within the fixed inode size.
127 static int zonefs_write_map_blocks(struct iomap_writepage_ctx *wpc,
128 struct inode *inode, loff_t offset)
130 struct zonefs_zone *z = zonefs_inode_zone(inode);
132 if (WARN_ON_ONCE(zonefs_zone_is_seq(z)))
134 if (WARN_ON_ONCE(offset >= i_size_read(inode)))
137 /* If the mapping is already OK, nothing needs to be done */
138 if (offset >= wpc->iomap.offset &&
139 offset < wpc->iomap.offset + wpc->iomap.length)
142 return zonefs_write_iomap_begin(inode, offset,
143 z->z_capacity - offset,
144 IOMAP_WRITE, &wpc->iomap, NULL);
147 static const struct iomap_writeback_ops zonefs_writeback_ops = {
148 .map_blocks = zonefs_write_map_blocks,
151 static int zonefs_writepages(struct address_space *mapping,
152 struct writeback_control *wbc)
154 struct iomap_writepage_ctx wpc = { };
156 return iomap_writepages(mapping, wbc, &wpc, &zonefs_writeback_ops);
159 static int zonefs_swap_activate(struct swap_info_struct *sis,
160 struct file *swap_file, sector_t *span)
162 struct inode *inode = file_inode(swap_file);
164 if (zonefs_inode_is_seq(inode)) {
165 zonefs_err(inode->i_sb,
166 "swap file: not a conventional zone file\n");
170 return iomap_swapfile_activate(sis, swap_file, span,
171 &zonefs_read_iomap_ops);
174 const struct address_space_operations zonefs_file_aops = {
175 .read_folio = zonefs_read_folio,
176 .readahead = zonefs_readahead,
177 .writepages = zonefs_writepages,
178 .dirty_folio = filemap_dirty_folio,
179 .release_folio = iomap_release_folio,
180 .invalidate_folio = iomap_invalidate_folio,
181 .migrate_folio = filemap_migrate_folio,
182 .is_partially_uptodate = iomap_is_partially_uptodate,
183 .error_remove_page = generic_error_remove_page,
184 .direct_IO = noop_direct_IO,
185 .swap_activate = zonefs_swap_activate,
188 int zonefs_file_truncate(struct inode *inode, loff_t isize)
190 struct zonefs_inode_info *zi = ZONEFS_I(inode);
191 struct zonefs_zone *z = zonefs_inode_zone(inode);
197 * Only sequential zone files can be truncated and truncation is allowed
198 * only down to a 0 size, which is equivalent to a zone reset, and to
199 * the maximum file size, which is equivalent to a zone finish.
201 if (!zonefs_zone_is_seq(z))
205 op = REQ_OP_ZONE_RESET;
206 else if (isize == z->z_capacity)
207 op = REQ_OP_ZONE_FINISH;
211 inode_dio_wait(inode);
213 /* Serialize against page faults */
214 filemap_invalidate_lock(inode->i_mapping);
216 /* Serialize against zonefs_iomap_begin() */
217 mutex_lock(&zi->i_truncate_mutex);
219 old_isize = i_size_read(inode);
220 if (isize == old_isize)
223 ret = zonefs_inode_zone_mgmt(inode, op);
228 * If the mount option ZONEFS_MNTOPT_EXPLICIT_OPEN is set,
229 * take care of open zones.
231 if (z->z_flags & ZONEFS_ZONE_OPEN) {
233 * Truncating a zone to EMPTY or FULL is the equivalent of
234 * closing the zone. For a truncation to 0, we need to
235 * re-open the zone to ensure new writes can be processed.
236 * For a truncation to the maximum file size, the zone is
237 * closed and writes cannot be accepted anymore, so clear
241 ret = zonefs_inode_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
243 z->z_flags &= ~ZONEFS_ZONE_OPEN;
246 zonefs_update_stats(inode, isize);
247 truncate_setsize(inode, isize);
248 z->z_wpoffset = isize;
249 zonefs_inode_account_active(inode);
252 mutex_unlock(&zi->i_truncate_mutex);
253 filemap_invalidate_unlock(inode->i_mapping);
258 static int zonefs_file_fsync(struct file *file, loff_t start, loff_t end,
261 struct inode *inode = file_inode(file);
264 if (unlikely(IS_IMMUTABLE(inode)))
268 * Since only direct writes are allowed in sequential files, page cache
269 * flush is needed only for conventional zone files.
271 if (zonefs_inode_is_cnv(inode))
272 ret = file_write_and_wait_range(file, start, end);
274 ret = blkdev_issue_flush(inode->i_sb->s_bdev);
277 zonefs_io_error(inode, true);
282 static vm_fault_t zonefs_filemap_page_mkwrite(struct vm_fault *vmf)
284 struct inode *inode = file_inode(vmf->vma->vm_file);
287 if (unlikely(IS_IMMUTABLE(inode)))
288 return VM_FAULT_SIGBUS;
291 * Sanity check: only conventional zone files can have shared
292 * writeable mappings.
294 if (zonefs_inode_is_seq(inode))
295 return VM_FAULT_NOPAGE;
297 sb_start_pagefault(inode->i_sb);
298 file_update_time(vmf->vma->vm_file);
300 /* Serialize against truncates */
301 filemap_invalidate_lock_shared(inode->i_mapping);
302 ret = iomap_page_mkwrite(vmf, &zonefs_write_iomap_ops);
303 filemap_invalidate_unlock_shared(inode->i_mapping);
305 sb_end_pagefault(inode->i_sb);
309 static const struct vm_operations_struct zonefs_file_vm_ops = {
310 .fault = filemap_fault,
311 .map_pages = filemap_map_pages,
312 .page_mkwrite = zonefs_filemap_page_mkwrite,
315 static int zonefs_file_mmap(struct file *file, struct vm_area_struct *vma)
318 * Conventional zones accept random writes, so their files can support
319 * shared writable mappings. For sequential zone files, only read
320 * mappings are possible since there are no guarantees for write
321 * ordering between msync() and page cache writeback.
323 if (zonefs_inode_is_seq(file_inode(file)) &&
324 (vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
328 vma->vm_ops = &zonefs_file_vm_ops;
333 static loff_t zonefs_file_llseek(struct file *file, loff_t offset, int whence)
335 loff_t isize = i_size_read(file_inode(file));
338 * Seeks are limited to below the zone size for conventional zones
339 * and below the zone write pointer for sequential zones. In both
340 * cases, this limit is the inode size.
342 return generic_file_llseek_size(file, offset, whence, isize, isize);
345 static int zonefs_file_write_dio_end_io(struct kiocb *iocb, ssize_t size,
346 int error, unsigned int flags)
348 struct inode *inode = file_inode(iocb->ki_filp);
349 struct zonefs_inode_info *zi = ZONEFS_I(inode);
352 zonefs_io_error(inode, true);
356 if (size && zonefs_inode_is_seq(inode)) {
358 * Note that we may be seeing completions out of order,
359 * but that is not a problem since a write completed
360 * successfully necessarily means that all preceding writes
361 * were also successful. So we can safely increase the inode
362 * size to the write end location.
364 mutex_lock(&zi->i_truncate_mutex);
365 if (i_size_read(inode) < iocb->ki_pos + size) {
366 zonefs_update_stats(inode, iocb->ki_pos + size);
367 zonefs_i_size_write(inode, iocb->ki_pos + size);
369 mutex_unlock(&zi->i_truncate_mutex);
375 static const struct iomap_dio_ops zonefs_write_dio_ops = {
376 .end_io = zonefs_file_write_dio_end_io,
379 static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
381 struct inode *inode = file_inode(iocb->ki_filp);
382 struct zonefs_zone *z = zonefs_inode_zone(inode);
383 struct block_device *bdev = inode->i_sb->s_bdev;
384 unsigned int max = bdev_max_zone_append_sectors(bdev);
391 max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize);
392 iov_iter_truncate(from, max);
395 * If the inode block size (zone write granularity) is smaller than the
396 * page size, we may be appending data belonging to the last page of the
397 * inode straddling inode->i_size, with that page already cached due to
398 * a buffered read or readahead. So make sure to invalidate that page.
399 * This will always be a no-op for the case where the block size is
400 * equal to the page size.
402 start = iocb->ki_pos >> PAGE_SHIFT;
403 end = (iocb->ki_pos + iov_iter_count(from) - 1) >> PAGE_SHIFT;
404 if (invalidate_inode_pages2_range(inode->i_mapping, start, end))
407 nr_pages = iov_iter_npages(from, BIO_MAX_VECS);
411 bio = bio_alloc(bdev, nr_pages,
412 REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE, GFP_NOFS);
413 bio->bi_iter.bi_sector = z->z_sector;
414 bio->bi_ioprio = iocb->ki_ioprio;
415 if (iocb_is_dsync(iocb))
416 bio->bi_opf |= REQ_FUA;
418 ret = bio_iov_iter_get_pages(bio, from);
422 size = bio->bi_iter.bi_size;
423 task_io_account_write(size);
425 if (iocb->ki_flags & IOCB_HIPRI)
426 bio_set_polled(bio, iocb);
428 ret = submit_bio_wait(bio);
431 * If the file zone was written underneath the file system, the zone
432 * write pointer may not be where we expect it to be, but the zone
433 * append write can still succeed. So check manually that we wrote where
434 * we intended to, that is, at zi->i_wpoffset.
438 z->z_sector + (z->z_wpoffset >> SECTOR_SHIFT);
440 if (bio->bi_iter.bi_sector != wpsector) {
441 zonefs_warn(inode->i_sb,
442 "Corrupted write pointer %llu for zone at %llu\n",
443 bio->bi_iter.bi_sector, z->z_sector);
448 zonefs_file_write_dio_end_io(iocb, size, ret, 0);
449 trace_zonefs_file_dio_append(inode, size, ret);
452 bio_release_pages(bio, false);
456 iocb->ki_pos += size;
464 * Do not exceed the LFS limits nor the file zone size. If pos is under the
465 * limit it becomes a short access. If it exceeds the limit, return -EFBIG.
467 static loff_t zonefs_write_check_limits(struct file *file, loff_t pos,
470 struct inode *inode = file_inode(file);
471 struct zonefs_zone *z = zonefs_inode_zone(inode);
472 loff_t limit = rlimit(RLIMIT_FSIZE);
473 loff_t max_size = z->z_capacity;
475 if (limit != RLIM_INFINITY) {
477 send_sig(SIGXFSZ, current, 0);
480 count = min(count, limit - pos);
483 if (!(file->f_flags & O_LARGEFILE))
484 max_size = min_t(loff_t, MAX_NON_LFS, max_size);
486 if (unlikely(pos >= max_size))
489 return min(count, max_size - pos);
492 static ssize_t zonefs_write_checks(struct kiocb *iocb, struct iov_iter *from)
494 struct file *file = iocb->ki_filp;
495 struct inode *inode = file_inode(file);
496 struct zonefs_inode_info *zi = ZONEFS_I(inode);
497 struct zonefs_zone *z = zonefs_inode_zone(inode);
500 if (IS_SWAPFILE(inode))
503 if (!iov_iter_count(from))
506 if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT))
509 if (iocb->ki_flags & IOCB_APPEND) {
510 if (zonefs_zone_is_cnv(z))
512 mutex_lock(&zi->i_truncate_mutex);
513 iocb->ki_pos = z->z_wpoffset;
514 mutex_unlock(&zi->i_truncate_mutex);
517 count = zonefs_write_check_limits(file, iocb->ki_pos,
518 iov_iter_count(from));
522 iov_iter_truncate(from, count);
523 return iov_iter_count(from);
527 * Handle direct writes. For sequential zone files, this is the only possible
528 * write path. For these files, check that the user is issuing writes
529 * sequentially from the end of the file. This code assumes that the block layer
530 * delivers write requests to the device in sequential order. This is always the
531 * case if a block IO scheduler implementing the ELEVATOR_F_ZBD_SEQ_WRITE
532 * elevator feature is being used (e.g. mq-deadline). The block layer always
533 * automatically select such an elevator for zoned block devices during the
534 * device initialization.
536 static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
538 struct inode *inode = file_inode(iocb->ki_filp);
539 struct zonefs_inode_info *zi = ZONEFS_I(inode);
540 struct zonefs_zone *z = zonefs_inode_zone(inode);
541 struct super_block *sb = inode->i_sb;
542 bool sync = is_sync_kiocb(iocb);
547 * For async direct IOs to sequential zone files, refuse IOCB_NOWAIT
548 * as this can cause write reordering (e.g. the first aio gets EAGAIN
549 * on the inode lock but the second goes through but is now unaligned).
551 if (zonefs_zone_is_seq(z) && !sync && (iocb->ki_flags & IOCB_NOWAIT))
554 if (iocb->ki_flags & IOCB_NOWAIT) {
555 if (!inode_trylock(inode))
561 count = zonefs_write_checks(iocb, from);
567 if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
572 /* Enforce sequential writes (append only) in sequential zones */
573 if (zonefs_zone_is_seq(z)) {
574 mutex_lock(&zi->i_truncate_mutex);
575 if (iocb->ki_pos != z->z_wpoffset) {
576 mutex_unlock(&zi->i_truncate_mutex);
580 mutex_unlock(&zi->i_truncate_mutex);
585 ret = zonefs_file_dio_append(iocb, from);
588 * iomap_dio_rw() may return ENOTBLK if there was an issue with
589 * page invalidation. Overwrite that error code with EBUSY to
590 * be consistent with zonefs_file_dio_append() return value for
593 ret = iomap_dio_rw(iocb, from, &zonefs_write_iomap_ops,
594 &zonefs_write_dio_ops, 0, NULL, 0);
599 if (zonefs_zone_is_seq(z) &&
600 (ret > 0 || ret == -EIOCBQUEUED)) {
605 * Update the zone write pointer offset assuming the write
606 * operation succeeded. If it did not, the error recovery path
607 * will correct it. Also do active seq file accounting.
609 mutex_lock(&zi->i_truncate_mutex);
610 z->z_wpoffset += count;
611 zonefs_inode_account_active(inode);
612 mutex_unlock(&zi->i_truncate_mutex);
621 static ssize_t zonefs_file_buffered_write(struct kiocb *iocb,
622 struct iov_iter *from)
624 struct inode *inode = file_inode(iocb->ki_filp);
628 * Direct IO writes are mandatory for sequential zone files so that the
629 * write IO issuing order is preserved.
631 if (zonefs_inode_is_seq(inode))
634 if (iocb->ki_flags & IOCB_NOWAIT) {
635 if (!inode_trylock(inode))
641 ret = zonefs_write_checks(iocb, from);
645 ret = iomap_file_buffered_write(iocb, from, &zonefs_write_iomap_ops);
648 else if (ret == -EIO)
649 zonefs_io_error(inode, true);
654 ret = generic_write_sync(iocb, ret);
659 static ssize_t zonefs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
661 struct inode *inode = file_inode(iocb->ki_filp);
662 struct zonefs_zone *z = zonefs_inode_zone(inode);
664 if (unlikely(IS_IMMUTABLE(inode)))
667 if (sb_rdonly(inode->i_sb))
670 /* Write operations beyond the zone capacity are not allowed */
671 if (iocb->ki_pos >= z->z_capacity)
674 if (iocb->ki_flags & IOCB_DIRECT) {
675 ssize_t ret = zonefs_file_dio_write(iocb, from);
681 return zonefs_file_buffered_write(iocb, from);
684 static int zonefs_file_read_dio_end_io(struct kiocb *iocb, ssize_t size,
685 int error, unsigned int flags)
688 zonefs_io_error(file_inode(iocb->ki_filp), false);
695 static const struct iomap_dio_ops zonefs_read_dio_ops = {
696 .end_io = zonefs_file_read_dio_end_io,
699 static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
701 struct inode *inode = file_inode(iocb->ki_filp);
702 struct zonefs_inode_info *zi = ZONEFS_I(inode);
703 struct zonefs_zone *z = zonefs_inode_zone(inode);
704 struct super_block *sb = inode->i_sb;
708 /* Offline zones cannot be read */
709 if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777)))
712 if (iocb->ki_pos >= z->z_capacity)
715 if (iocb->ki_flags & IOCB_NOWAIT) {
716 if (!inode_trylock_shared(inode))
719 inode_lock_shared(inode);
722 /* Limit read operations to written data */
723 mutex_lock(&zi->i_truncate_mutex);
724 isize = i_size_read(inode);
725 if (iocb->ki_pos >= isize) {
726 mutex_unlock(&zi->i_truncate_mutex);
730 iov_iter_truncate(to, isize - iocb->ki_pos);
731 mutex_unlock(&zi->i_truncate_mutex);
733 if (iocb->ki_flags & IOCB_DIRECT) {
734 size_t count = iov_iter_count(to);
736 if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
740 file_accessed(iocb->ki_filp);
741 ret = iomap_dio_rw(iocb, to, &zonefs_read_iomap_ops,
742 &zonefs_read_dio_ops, 0, NULL, 0);
744 ret = generic_file_read_iter(iocb, to);
746 zonefs_io_error(inode, false);
750 inode_unlock_shared(inode);
756 * Write open accounting is done only for sequential files.
758 static inline bool zonefs_seq_file_need_wro(struct inode *inode,
761 if (zonefs_inode_is_cnv(inode))
764 if (!(file->f_mode & FMODE_WRITE))
770 static int zonefs_seq_file_write_open(struct inode *inode)
772 struct zonefs_inode_info *zi = ZONEFS_I(inode);
773 struct zonefs_zone *z = zonefs_inode_zone(inode);
776 mutex_lock(&zi->i_truncate_mutex);
778 if (!zi->i_wr_refcnt) {
779 struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
780 unsigned int wro = atomic_inc_return(&sbi->s_wro_seq_files);
782 if (sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
784 if (sbi->s_max_wro_seq_files
785 && wro > sbi->s_max_wro_seq_files) {
786 atomic_dec(&sbi->s_wro_seq_files);
791 if (i_size_read(inode) < z->z_capacity) {
792 ret = zonefs_inode_zone_mgmt(inode,
795 atomic_dec(&sbi->s_wro_seq_files);
798 z->z_flags |= ZONEFS_ZONE_OPEN;
799 zonefs_inode_account_active(inode);
807 mutex_unlock(&zi->i_truncate_mutex);
812 static int zonefs_file_open(struct inode *inode, struct file *file)
816 ret = generic_file_open(inode, file);
820 if (zonefs_seq_file_need_wro(inode, file))
821 return zonefs_seq_file_write_open(inode);
826 static void zonefs_seq_file_write_close(struct inode *inode)
828 struct zonefs_inode_info *zi = ZONEFS_I(inode);
829 struct zonefs_zone *z = zonefs_inode_zone(inode);
830 struct super_block *sb = inode->i_sb;
831 struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
834 mutex_lock(&zi->i_truncate_mutex);
841 * The file zone may not be open anymore (e.g. the file was truncated to
842 * its maximum size or it was fully written). For this case, we only
843 * need to decrement the write open count.
845 if (z->z_flags & ZONEFS_ZONE_OPEN) {
846 ret = zonefs_inode_zone_mgmt(inode, REQ_OP_ZONE_CLOSE);
848 __zonefs_io_error(inode, false);
850 * Leaving zones explicitly open may lead to a state
851 * where most zones cannot be written (zone resources
852 * exhausted). So take preventive action by remounting
855 if (z->z_flags & ZONEFS_ZONE_OPEN &&
856 !(sb->s_flags & SB_RDONLY)) {
858 "closing zone at %llu failed %d\n",
861 "remounting filesystem read-only\n");
862 sb->s_flags |= SB_RDONLY;
867 z->z_flags &= ~ZONEFS_ZONE_OPEN;
868 zonefs_inode_account_active(inode);
871 atomic_dec(&sbi->s_wro_seq_files);
874 mutex_unlock(&zi->i_truncate_mutex);
877 static int zonefs_file_release(struct inode *inode, struct file *file)
880 * If we explicitly open a zone we must close it again as well, but the
881 * zone management operation can fail (either due to an IO error or as
882 * the zone has gone offline or read-only). Make sure we don't fail the
883 * close(2) for user-space.
885 if (zonefs_seq_file_need_wro(inode, file))
886 zonefs_seq_file_write_close(inode);
891 const struct file_operations zonefs_file_operations = {
892 .open = zonefs_file_open,
893 .release = zonefs_file_release,
894 .fsync = zonefs_file_fsync,
895 .mmap = zonefs_file_mmap,
896 .llseek = zonefs_file_llseek,
897 .read_iter = zonefs_file_read_iter,
898 .write_iter = zonefs_file_write_iter,
899 .splice_read = generic_file_splice_read,
900 .splice_write = iter_file_splice_write,
901 .iopoll = iocb_bio_iopoll,