1 // SPDX-License-Identifier: GPL-2.0
5 #include "alloc_foreground.h"
7 #include "btree_update.h"
12 #include "extent_update.h"
23 #include <linux/aio.h>
24 #include <linux/backing-dev.h>
25 #include <linux/falloc.h>
26 #include <linux/migrate.h>
27 #include <linux/mmu_context.h>
28 #include <linux/pagevec.h>
29 #include <linux/rmap.h>
30 #include <linux/sched/signal.h>
31 #include <linux/task_io_accounting_ops.h>
32 #include <linux/uio.h>
33 #include <linux/writeback.h>
35 #include <trace/events/bcachefs.h>
36 #include <trace/events/writeback.h>
38 static inline bool bio_full(struct bio *bio, unsigned len)
40 if (bio->bi_vcnt >= bio->bi_max_vecs)
42 if (bio->bi_iter.bi_size > UINT_MAX - len)
47 static inline struct address_space *faults_disabled_mapping(void)
49 return (void *) (((unsigned long) current->faults_disabled_mapping) & ~1UL);
52 static inline void set_fdm_dropped_locks(void)
54 current->faults_disabled_mapping =
55 (void *) (((unsigned long) current->faults_disabled_mapping)|1);
58 static inline bool fdm_dropped_locks(void)
60 return ((unsigned long) current->faults_disabled_mapping) & 1;
67 struct bch_writepage_io {
69 struct bch_inode_info *inode;
72 struct bch_write_op op;
76 struct completion done;
82 struct quota_res quota_res;
86 struct iovec inline_vecs[2];
89 struct bch_write_op op;
97 struct bch_read_bio rbio;
100 /* pagecache_block must be held */
101 static int write_invalidate_inode_pages_range(struct address_space *mapping,
102 loff_t start, loff_t end)
107 * XXX: the way this is currently implemented, we can spin if a process
108 * is continually redirtying a specific page
111 if (!mapping->nrpages)
114 ret = filemap_write_and_wait_range(mapping, start, end);
118 if (!mapping->nrpages)
121 ret = invalidate_inode_pages2_range(mapping,
124 } while (ret == -EBUSY);
131 #ifdef CONFIG_BCACHEFS_QUOTA
133 static void bch2_quota_reservation_put(struct bch_fs *c,
134 struct bch_inode_info *inode,
135 struct quota_res *res)
140 mutex_lock(&inode->ei_quota_lock);
141 BUG_ON(res->sectors > inode->ei_quota_reserved);
143 bch2_quota_acct(c, inode->ei_qid, Q_SPC,
144 -((s64) res->sectors), KEY_TYPE_QUOTA_PREALLOC);
145 inode->ei_quota_reserved -= res->sectors;
146 mutex_unlock(&inode->ei_quota_lock);
151 static int bch2_quota_reservation_add(struct bch_fs *c,
152 struct bch_inode_info *inode,
153 struct quota_res *res,
159 mutex_lock(&inode->ei_quota_lock);
160 ret = bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors,
161 check_enospc ? KEY_TYPE_QUOTA_PREALLOC : KEY_TYPE_QUOTA_NOCHECK);
163 inode->ei_quota_reserved += sectors;
164 res->sectors += sectors;
166 mutex_unlock(&inode->ei_quota_lock);
173 static void bch2_quota_reservation_put(struct bch_fs *c,
174 struct bch_inode_info *inode,
175 struct quota_res *res)
179 static int bch2_quota_reservation_add(struct bch_fs *c,
180 struct bch_inode_info *inode,
181 struct quota_res *res,
190 /* i_size updates: */
192 struct inode_new_size {
198 static int inode_set_size(struct bch_inode_info *inode,
199 struct bch_inode_unpacked *bi,
202 struct inode_new_size *s = p;
204 bi->bi_size = s->new_size;
205 if (s->fields & ATTR_ATIME)
206 bi->bi_atime = s->now;
207 if (s->fields & ATTR_MTIME)
208 bi->bi_mtime = s->now;
209 if (s->fields & ATTR_CTIME)
210 bi->bi_ctime = s->now;
215 int __must_check bch2_write_inode_size(struct bch_fs *c,
216 struct bch_inode_info *inode,
217 loff_t new_size, unsigned fields)
219 struct inode_new_size s = {
220 .new_size = new_size,
221 .now = bch2_current_time(c),
225 return bch2_write_inode(c, inode, inode_set_size, &s, fields);
228 static void i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
229 struct quota_res *quota_res, s64 sectors)
234 mutex_lock(&inode->ei_quota_lock);
235 bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,
236 "inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
237 inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
238 inode->ei_inode.bi_sectors);
239 inode->v.i_blocks += sectors;
241 #ifdef CONFIG_BCACHEFS_QUOTA
242 if (quota_res && sectors > 0) {
243 BUG_ON(sectors > quota_res->sectors);
244 BUG_ON(sectors > inode->ei_quota_reserved);
246 quota_res->sectors -= sectors;
247 inode->ei_quota_reserved -= sectors;
249 bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors, KEY_TYPE_QUOTA_WARN);
252 mutex_unlock(&inode->ei_quota_lock);
257 /* stored in page->private: */
259 struct bch_page_sector {
260 /* Uncompressed, fully allocated replicas (or on disk reservation): */
261 unsigned nr_replicas:4;
263 /* Owns PAGE_SECTORS * replicas_reserved sized in memory reservation: */
264 unsigned replicas_reserved:4;
271 SECTOR_DIRTY_RESERVED,
276 struct bch_page_state {
278 atomic_t write_count;
280 struct bch_page_sector s[PAGE_SECTORS];
283 static inline struct bch_page_state *__bch2_page_state(struct page *page)
285 return page_has_private(page)
286 ? (struct bch_page_state *) page_private(page)
290 static inline struct bch_page_state *bch2_page_state(struct page *page)
292 EBUG_ON(!PageLocked(page));
294 return __bch2_page_state(page);
297 /* for newly allocated pages: */
298 static void __bch2_page_state_release(struct page *page)
300 kfree(detach_page_private(page));
303 static void bch2_page_state_release(struct page *page)
305 EBUG_ON(!PageLocked(page));
306 __bch2_page_state_release(page);
309 /* for newly allocated pages: */
310 static struct bch_page_state *__bch2_page_state_create(struct page *page,
313 struct bch_page_state *s;
315 s = kzalloc(sizeof(*s), GFP_NOFS|gfp);
319 spin_lock_init(&s->lock);
320 attach_page_private(page, s);
324 static struct bch_page_state *bch2_page_state_create(struct page *page,
327 return bch2_page_state(page) ?: __bch2_page_state_create(page, gfp);
330 static unsigned bkey_to_sector_state(const struct bkey *k)
332 if (k->type == KEY_TYPE_reservation)
333 return SECTOR_RESERVED;
334 if (bkey_extent_is_allocation(k))
335 return SECTOR_ALLOCATED;
336 return SECTOR_UNALLOCATED;
339 static void __bch2_page_state_set(struct page *page,
340 unsigned pg_offset, unsigned pg_len,
341 unsigned nr_ptrs, unsigned state)
343 struct bch_page_state *s = bch2_page_state_create(page, __GFP_NOFAIL);
346 BUG_ON(pg_offset >= PAGE_SECTORS);
347 BUG_ON(pg_offset + pg_len > PAGE_SECTORS);
351 for (i = pg_offset; i < pg_offset + pg_len; i++) {
352 s->s[i].nr_replicas = nr_ptrs;
353 s->s[i].state = state;
356 if (i == PAGE_SECTORS)
359 spin_unlock(&s->lock);
362 static int bch2_page_state_set(struct bch_fs *c, subvol_inum inum,
363 struct page **pages, unsigned nr_pages)
365 struct btree_trans trans;
366 struct btree_iter iter;
368 u64 offset = pages[0]->index << PAGE_SECTORS_SHIFT;
373 bch2_trans_init(&trans, c, 0, 0);
375 bch2_trans_begin(&trans);
377 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
381 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
382 SPOS(inum.inum, offset, snapshot),
383 BTREE_ITER_SLOTS, k, ret) {
384 unsigned nr_ptrs = bch2_bkey_nr_ptrs_fully_allocated(k);
385 unsigned state = bkey_to_sector_state(k.k);
387 while (pg_idx < nr_pages) {
388 struct page *page = pages[pg_idx];
389 u64 pg_start = page->index << PAGE_SECTORS_SHIFT;
390 u64 pg_end = (page->index + 1) << PAGE_SECTORS_SHIFT;
391 unsigned pg_offset = max(bkey_start_offset(k.k), pg_start) - pg_start;
392 unsigned pg_len = min(k.k->p.offset, pg_end) - pg_offset - pg_start;
394 BUG_ON(k.k->p.offset < pg_start);
395 BUG_ON(bkey_start_offset(k.k) > pg_end);
397 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate)
398 __bch2_page_state_set(page, pg_offset, pg_len, nr_ptrs, state);
400 if (k.k->p.offset < pg_end)
405 if (pg_idx == nr_pages)
409 offset = iter.pos.offset;
410 bch2_trans_iter_exit(&trans, &iter);
412 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
414 bch2_trans_exit(&trans);
419 static void bch2_bio_page_state_set(struct bio *bio, struct bkey_s_c k)
421 struct bvec_iter iter;
423 unsigned nr_ptrs = k.k->type == KEY_TYPE_reflink_v
424 ? 0 : bch2_bkey_nr_ptrs_fully_allocated(k);
425 unsigned state = bkey_to_sector_state(k.k);
427 bio_for_each_segment(bv, bio, iter)
428 __bch2_page_state_set(bv.bv_page, bv.bv_offset >> 9,
429 bv.bv_len >> 9, nr_ptrs, state);
432 static void mark_pagecache_unallocated(struct bch_inode_info *inode,
435 pgoff_t index = start >> PAGE_SECTORS_SHIFT;
436 pgoff_t end_index = (end - 1) >> PAGE_SECTORS_SHIFT;
437 struct folio_batch fbatch;
443 folio_batch_init(&fbatch);
445 while (filemap_get_folios(inode->v.i_mapping,
446 &index, end_index, &fbatch)) {
447 for (i = 0; i < folio_batch_count(&fbatch); i++) {
448 struct folio *folio = fbatch.folios[i];
449 u64 pg_start = folio->index << PAGE_SECTORS_SHIFT;
450 u64 pg_end = (folio->index + 1) << PAGE_SECTORS_SHIFT;
451 unsigned pg_offset = max(start, pg_start) - pg_start;
452 unsigned pg_len = min(end, pg_end) - pg_offset - pg_start;
453 struct bch_page_state *s;
455 BUG_ON(end <= pg_start);
456 BUG_ON(pg_offset >= PAGE_SECTORS);
457 BUG_ON(pg_offset + pg_len > PAGE_SECTORS);
460 s = bch2_page_state(&folio->page);
464 for (j = pg_offset; j < pg_offset + pg_len; j++)
465 s->s[j].nr_replicas = 0;
466 spin_unlock(&s->lock);
471 folio_batch_release(&fbatch);
476 static void mark_pagecache_reserved(struct bch_inode_info *inode,
479 struct bch_fs *c = inode->v.i_sb->s_fs_info;
480 pgoff_t index = start >> PAGE_SECTORS_SHIFT;
481 pgoff_t end_index = (end - 1) >> PAGE_SECTORS_SHIFT;
482 struct folio_batch fbatch;
483 s64 i_sectors_delta = 0;
489 folio_batch_init(&fbatch);
491 while (filemap_get_folios(inode->v.i_mapping,
492 &index, end_index, &fbatch)) {
493 for (i = 0; i < folio_batch_count(&fbatch); i++) {
494 struct folio *folio = fbatch.folios[i];
495 u64 pg_start = folio->index << PAGE_SECTORS_SHIFT;
496 u64 pg_end = (folio->index + 1) << PAGE_SECTORS_SHIFT;
497 unsigned pg_offset = max(start, pg_start) - pg_start;
498 unsigned pg_len = min(end, pg_end) - pg_offset - pg_start;
499 struct bch_page_state *s;
501 BUG_ON(end <= pg_start);
502 BUG_ON(pg_offset >= PAGE_SECTORS);
503 BUG_ON(pg_offset + pg_len > PAGE_SECTORS);
506 s = bch2_page_state(&folio->page);
510 for (j = pg_offset; j < pg_offset + pg_len; j++)
511 switch (s->s[j].state) {
512 case SECTOR_UNALLOCATED:
513 s->s[j].state = SECTOR_RESERVED;
516 s->s[j].state = SECTOR_DIRTY_RESERVED;
522 spin_unlock(&s->lock);
527 folio_batch_release(&fbatch);
531 i_sectors_acct(c, inode, NULL, i_sectors_delta);
534 static inline unsigned inode_nr_replicas(struct bch_fs *c, struct bch_inode_info *inode)
536 /* XXX: this should not be open coded */
537 return inode->ei_inode.bi_data_replicas
538 ? inode->ei_inode.bi_data_replicas - 1
539 : c->opts.data_replicas;
542 static inline unsigned sectors_to_reserve(struct bch_page_sector *s,
543 unsigned nr_replicas)
545 return max(0, (int) nr_replicas -
547 s->replicas_reserved);
550 static int bch2_get_page_disk_reservation(struct bch_fs *c,
551 struct bch_inode_info *inode,
552 struct page *page, bool check_enospc)
554 struct bch_page_state *s = bch2_page_state_create(page, 0);
555 unsigned nr_replicas = inode_nr_replicas(c, inode);
556 struct disk_reservation disk_res = { 0 };
557 unsigned i, disk_res_sectors = 0;
563 for (i = 0; i < ARRAY_SIZE(s->s); i++)
564 disk_res_sectors += sectors_to_reserve(&s->s[i], nr_replicas);
566 if (!disk_res_sectors)
569 ret = bch2_disk_reservation_get(c, &disk_res,
572 ? BCH_DISK_RESERVATION_NOFAIL
577 for (i = 0; i < ARRAY_SIZE(s->s); i++)
578 s->s[i].replicas_reserved +=
579 sectors_to_reserve(&s->s[i], nr_replicas);
584 struct bch2_page_reservation {
585 struct disk_reservation disk;
586 struct quota_res quota;
589 static void bch2_page_reservation_init(struct bch_fs *c,
590 struct bch_inode_info *inode,
591 struct bch2_page_reservation *res)
593 memset(res, 0, sizeof(*res));
595 res->disk.nr_replicas = inode_nr_replicas(c, inode);
598 static void bch2_page_reservation_put(struct bch_fs *c,
599 struct bch_inode_info *inode,
600 struct bch2_page_reservation *res)
602 bch2_disk_reservation_put(c, &res->disk);
603 bch2_quota_reservation_put(c, inode, &res->quota);
606 static int bch2_page_reservation_get(struct bch_fs *c,
607 struct bch_inode_info *inode, struct page *page,
608 struct bch2_page_reservation *res,
609 unsigned offset, unsigned len)
611 struct bch_page_state *s = bch2_page_state_create(page, 0);
612 unsigned i, disk_sectors = 0, quota_sectors = 0;
618 BUG_ON(!s->uptodate);
620 for (i = round_down(offset, block_bytes(c)) >> 9;
621 i < round_up(offset + len, block_bytes(c)) >> 9;
623 disk_sectors += sectors_to_reserve(&s->s[i],
624 res->disk.nr_replicas);
625 quota_sectors += s->s[i].state == SECTOR_UNALLOCATED;
629 ret = bch2_disk_reservation_add(c, &res->disk, disk_sectors, 0);
635 ret = bch2_quota_reservation_add(c, inode, &res->quota,
636 quota_sectors, true);
638 struct disk_reservation tmp = {
639 .sectors = disk_sectors
642 bch2_disk_reservation_put(c, &tmp);
643 res->disk.sectors -= disk_sectors;
651 static void bch2_clear_page_bits(struct page *page)
653 struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
654 struct bch_fs *c = inode->v.i_sb->s_fs_info;
655 struct bch_page_state *s = bch2_page_state(page);
656 struct disk_reservation disk_res = { 0 };
657 int i, dirty_sectors = 0;
662 EBUG_ON(!PageLocked(page));
663 EBUG_ON(PageWriteback(page));
665 for (i = 0; i < ARRAY_SIZE(s->s); i++) {
666 disk_res.sectors += s->s[i].replicas_reserved;
667 s->s[i].replicas_reserved = 0;
669 switch (s->s[i].state) {
671 s->s[i].state = SECTOR_UNALLOCATED;
674 case SECTOR_DIRTY_RESERVED:
675 s->s[i].state = SECTOR_RESERVED;
682 bch2_disk_reservation_put(c, &disk_res);
684 i_sectors_acct(c, inode, NULL, dirty_sectors);
686 bch2_page_state_release(page);
689 static void bch2_set_page_dirty(struct bch_fs *c,
690 struct bch_inode_info *inode, struct page *page,
691 struct bch2_page_reservation *res,
692 unsigned offset, unsigned len)
694 struct bch_page_state *s = bch2_page_state(page);
695 unsigned i, dirty_sectors = 0;
697 WARN_ON((u64) page_offset(page) + offset + len >
698 round_up((u64) i_size_read(&inode->v), block_bytes(c)));
702 for (i = round_down(offset, block_bytes(c)) >> 9;
703 i < round_up(offset + len, block_bytes(c)) >> 9;
705 unsigned sectors = sectors_to_reserve(&s->s[i],
706 res->disk.nr_replicas);
709 * This can happen if we race with the error path in
710 * bch2_writepage_io_done():
712 sectors = min_t(unsigned, sectors, res->disk.sectors);
714 s->s[i].replicas_reserved += sectors;
715 res->disk.sectors -= sectors;
717 switch (s->s[i].state) {
718 case SECTOR_UNALLOCATED:
719 s->s[i].state = SECTOR_DIRTY;
722 case SECTOR_RESERVED:
723 s->s[i].state = SECTOR_DIRTY_RESERVED;
730 spin_unlock(&s->lock);
732 i_sectors_acct(c, inode, &res->quota, dirty_sectors);
734 if (!PageDirty(page))
735 __set_page_dirty_nobuffers(page);
738 vm_fault_t bch2_page_fault(struct vm_fault *vmf)
740 struct file *file = vmf->vma->vm_file;
741 struct address_space *mapping = file->f_mapping;
742 struct address_space *fdm = faults_disabled_mapping();
743 struct bch_inode_info *inode = file_bch_inode(file);
747 return VM_FAULT_SIGBUS;
751 struct bch_inode_info *fdm_host = to_bch_ei(fdm->host);
753 if (bch2_pagecache_add_tryget(&inode->ei_pagecache_lock))
756 bch2_pagecache_block_put(&fdm_host->ei_pagecache_lock);
758 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
759 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
761 bch2_pagecache_block_get(&fdm_host->ei_pagecache_lock);
763 /* Signal that lock has been dropped: */
764 set_fdm_dropped_locks();
765 return VM_FAULT_SIGBUS;
768 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
770 ret = filemap_fault(vmf);
771 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
776 vm_fault_t bch2_page_mkwrite(struct vm_fault *vmf)
778 struct page *page = vmf->page;
779 struct file *file = vmf->vma->vm_file;
780 struct bch_inode_info *inode = file_bch_inode(file);
781 struct address_space *mapping = file->f_mapping;
782 struct bch_fs *c = inode->v.i_sb->s_fs_info;
783 struct bch2_page_reservation res;
788 bch2_page_reservation_init(c, inode, &res);
790 sb_start_pagefault(inode->v.i_sb);
791 file_update_time(file);
794 * Not strictly necessary, but helps avoid dio writes livelocking in
795 * write_invalidate_inode_pages_range() - can drop this if/when we get
796 * a write_invalidate_inode_pages_range() that works without dropping
797 * page lock before invalidating page
799 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
802 isize = i_size_read(&inode->v);
804 if (page->mapping != mapping || page_offset(page) >= isize) {
806 ret = VM_FAULT_NOPAGE;
810 len = min_t(loff_t, PAGE_SIZE, isize - page_offset(page));
812 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
813 if (bch2_page_state_set(c, inode_inum(inode), &page, 1)) {
815 ret = VM_FAULT_SIGBUS;
820 if (bch2_page_reservation_get(c, inode, page, &res, 0, len)) {
822 ret = VM_FAULT_SIGBUS;
826 bch2_set_page_dirty(c, inode, page, &res, 0, len);
827 bch2_page_reservation_put(c, inode, &res);
829 wait_for_stable_page(page);
830 ret = VM_FAULT_LOCKED;
832 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
833 sb_end_pagefault(inode->v.i_sb);
838 void bch2_invalidate_folio(struct folio *folio, size_t offset, size_t length)
840 if (offset || length < folio_size(folio))
843 bch2_clear_page_bits(&folio->page);
846 bool bch2_release_folio(struct folio *folio, gfp_t gfp_mask)
848 if (folio_test_dirty(folio) || folio_test_writeback(folio))
851 bch2_clear_page_bits(&folio->page);
857 static void bch2_readpages_end_io(struct bio *bio)
859 struct bvec_iter_all iter;
862 bio_for_each_segment_all(bv, bio, iter) {
863 struct page *page = bv->bv_page;
865 if (!bio->bi_status) {
866 SetPageUptodate(page);
868 ClearPageUptodate(page);
877 struct readpages_iter {
878 struct address_space *mapping;
885 static int readpages_iter_init(struct readpages_iter *iter,
886 struct readahead_control *ractl)
888 unsigned i, nr_pages = readahead_count(ractl);
890 memset(iter, 0, sizeof(*iter));
892 iter->mapping = ractl->mapping;
893 iter->offset = readahead_index(ractl);
894 iter->nr_pages = nr_pages;
896 iter->pages = kmalloc_array(nr_pages, sizeof(struct page *), GFP_NOFS);
900 nr_pages = __readahead_batch(ractl, iter->pages, nr_pages);
901 for (i = 0; i < nr_pages; i++) {
902 __bch2_page_state_create(iter->pages[i], __GFP_NOFAIL);
903 put_page(iter->pages[i]);
909 static inline struct page *readpage_iter_next(struct readpages_iter *iter)
911 if (iter->idx >= iter->nr_pages)
914 EBUG_ON(iter->pages[iter->idx]->index != iter->offset + iter->idx);
916 return iter->pages[iter->idx];
919 static bool extent_partial_reads_expensive(struct bkey_s_c k)
921 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
922 struct bch_extent_crc_unpacked crc;
923 const union bch_extent_entry *i;
925 bkey_for_each_crc(k.k, ptrs, crc, i)
926 if (crc.csum_type || crc.compression_type)
931 static void readpage_bio_extend(struct readpages_iter *iter,
933 unsigned sectors_this_extent,
936 while (bio_sectors(bio) < sectors_this_extent &&
937 bio->bi_vcnt < bio->bi_max_vecs) {
938 pgoff_t page_offset = bio_end_sector(bio) >> PAGE_SECTORS_SHIFT;
939 struct page *page = readpage_iter_next(iter);
943 if (iter->offset + iter->idx != page_offset)
951 page = xa_load(&iter->mapping->i_pages, page_offset);
952 if (page && !xa_is_value(page))
955 page = __page_cache_alloc(readahead_gfp_mask(iter->mapping));
959 if (!__bch2_page_state_create(page, 0)) {
964 ret = add_to_page_cache_lru(page, iter->mapping,
965 page_offset, GFP_NOFS);
967 __bch2_page_state_release(page);
975 BUG_ON(!bio_add_page(bio, page, PAGE_SIZE, 0));
979 static void bchfs_read(struct btree_trans *trans,
980 struct bch_read_bio *rbio,
982 struct readpages_iter *readpages_iter)
984 struct bch_fs *c = trans->c;
985 struct btree_iter iter;
987 int flags = BCH_READ_RETRY_IF_STALE|
988 BCH_READ_MAY_PROMOTE;
993 rbio->start_time = local_clock();
994 rbio->subvol = inum.subvol;
996 bch2_bkey_buf_init(&sk);
998 bch2_trans_begin(trans);
999 iter = (struct btree_iter) { NULL };
1001 ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
1005 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
1006 SPOS(inum.inum, rbio->bio.bi_iter.bi_sector, snapshot),
1010 unsigned bytes, sectors, offset_into_extent;
1011 enum btree_id data_btree = BTREE_ID_extents;
1014 * read_extent -> io_time_reset may cause a transaction restart
1015 * without returning an error, we need to check for that here:
1017 ret = bch2_trans_relock(trans);
1021 bch2_btree_iter_set_pos(&iter,
1022 POS(inum.inum, rbio->bio.bi_iter.bi_sector));
1024 k = bch2_btree_iter_peek_slot(&iter);
1029 offset_into_extent = iter.pos.offset -
1030 bkey_start_offset(k.k);
1031 sectors = k.k->size - offset_into_extent;
1033 bch2_bkey_buf_reassemble(&sk, c, k);
1035 ret = bch2_read_indirect_extent(trans, &data_btree,
1036 &offset_into_extent, &sk);
1040 k = bkey_i_to_s_c(sk.k);
1042 sectors = min(sectors, k.k->size - offset_into_extent);
1045 readpage_bio_extend(readpages_iter, &rbio->bio, sectors,
1046 extent_partial_reads_expensive(k));
1048 bytes = min(sectors, bio_sectors(&rbio->bio)) << 9;
1049 swap(rbio->bio.bi_iter.bi_size, bytes);
1051 if (rbio->bio.bi_iter.bi_size == bytes)
1052 flags |= BCH_READ_LAST_FRAGMENT;
1054 bch2_bio_page_state_set(&rbio->bio, k);
1056 bch2_read_extent(trans, rbio, iter.pos,
1057 data_btree, k, offset_into_extent, flags);
1059 if (flags & BCH_READ_LAST_FRAGMENT)
1062 swap(rbio->bio.bi_iter.bi_size, bytes);
1063 bio_advance(&rbio->bio, bytes);
1065 ret = btree_trans_too_many_iters(trans);
1070 bch2_trans_iter_exit(trans, &iter);
1072 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
1076 bch_err_inum_ratelimited(c, inum.inum,
1077 "read error %i from btree lookup", ret);
1078 rbio->bio.bi_status = BLK_STS_IOERR;
1079 bio_endio(&rbio->bio);
1082 bch2_bkey_buf_exit(&sk, c);
1085 void bch2_readahead(struct readahead_control *ractl)
1087 struct bch_inode_info *inode = to_bch_ei(ractl->mapping->host);
1088 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1089 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1090 struct btree_trans trans;
1092 struct readpages_iter readpages_iter;
1095 ret = readpages_iter_init(&readpages_iter, ractl);
1098 bch2_trans_init(&trans, c, 0, 0);
1100 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1102 while ((page = readpage_iter_next(&readpages_iter))) {
1103 pgoff_t index = readpages_iter.offset + readpages_iter.idx;
1104 unsigned n = min_t(unsigned,
1105 readpages_iter.nr_pages -
1108 struct bch_read_bio *rbio =
1109 rbio_init(bio_alloc_bioset(NULL, n, REQ_OP_READ,
1110 GFP_NOFS, &c->bio_read),
1113 readpages_iter.idx++;
1115 rbio->bio.bi_iter.bi_sector = (sector_t) index << PAGE_SECTORS_SHIFT;
1116 rbio->bio.bi_end_io = bch2_readpages_end_io;
1117 BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
1119 bchfs_read(&trans, rbio, inode_inum(inode),
1123 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1125 bch2_trans_exit(&trans);
1126 kfree(readpages_iter.pages);
1129 static void __bchfs_readpage(struct bch_fs *c, struct bch_read_bio *rbio,
1130 subvol_inum inum, struct page *page)
1132 struct btree_trans trans;
1134 bch2_page_state_create(page, __GFP_NOFAIL);
1136 bio_set_op_attrs(&rbio->bio, REQ_OP_READ, REQ_SYNC);
1137 rbio->bio.bi_iter.bi_sector =
1138 (sector_t) page->index << PAGE_SECTORS_SHIFT;
1139 BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
1141 bch2_trans_init(&trans, c, 0, 0);
1142 bchfs_read(&trans, rbio, inum, NULL);
1143 bch2_trans_exit(&trans);
1146 static void bch2_read_single_page_end_io(struct bio *bio)
1148 complete(bio->bi_private);
1151 static int bch2_read_single_page(struct page *page,
1152 struct address_space *mapping)
1154 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1155 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1156 struct bch_read_bio *rbio;
1158 DECLARE_COMPLETION_ONSTACK(done);
1160 rbio = rbio_init(bio_alloc_bioset(NULL, 1, REQ_OP_READ, GFP_NOFS, &c->bio_read),
1161 io_opts(c, &inode->ei_inode));
1162 rbio->bio.bi_private = &done;
1163 rbio->bio.bi_end_io = bch2_read_single_page_end_io;
1165 __bchfs_readpage(c, rbio, inode_inum(inode), page);
1166 wait_for_completion(&done);
1168 ret = blk_status_to_errno(rbio->bio.bi_status);
1169 bio_put(&rbio->bio);
1174 SetPageUptodate(page);
1178 int bch2_read_folio(struct file *file, struct folio *folio)
1180 struct page *page = &folio->page;
1183 ret = bch2_read_single_page(page, page->mapping);
1184 folio_unlock(folio);
1185 return bch2_err_class(ret);
1190 struct bch_writepage_state {
1191 struct bch_writepage_io *io;
1192 struct bch_io_opts opts;
1195 static inline struct bch_writepage_state bch_writepage_state_init(struct bch_fs *c,
1196 struct bch_inode_info *inode)
1198 return (struct bch_writepage_state) {
1199 .opts = io_opts(c, &inode->ei_inode)
1203 static void bch2_writepage_io_free(struct closure *cl)
1205 struct bch_writepage_io *io = container_of(cl,
1206 struct bch_writepage_io, cl);
1208 bio_put(&io->op.wbio.bio);
1211 static void bch2_writepage_io_done(struct closure *cl)
1213 struct bch_writepage_io *io = container_of(cl,
1214 struct bch_writepage_io, cl);
1215 struct bch_fs *c = io->op.c;
1216 struct bio *bio = &io->op.wbio.bio;
1217 struct bvec_iter_all iter;
1218 struct bio_vec *bvec;
1222 set_bit(EI_INODE_ERROR, &io->inode->ei_flags);
1224 bio_for_each_segment_all(bvec, bio, iter) {
1225 struct bch_page_state *s;
1227 SetPageError(bvec->bv_page);
1228 mapping_set_error(bvec->bv_page->mapping, -EIO);
1230 s = __bch2_page_state(bvec->bv_page);
1231 spin_lock(&s->lock);
1232 for (i = 0; i < PAGE_SECTORS; i++)
1233 s->s[i].nr_replicas = 0;
1234 spin_unlock(&s->lock);
1238 if (io->op.flags & BCH_WRITE_WROTE_DATA_INLINE) {
1239 bio_for_each_segment_all(bvec, bio, iter) {
1240 struct bch_page_state *s;
1242 s = __bch2_page_state(bvec->bv_page);
1243 spin_lock(&s->lock);
1244 for (i = 0; i < PAGE_SECTORS; i++)
1245 s->s[i].nr_replicas = 0;
1246 spin_unlock(&s->lock);
1251 * racing with fallocate can cause us to add fewer sectors than
1252 * expected - but we shouldn't add more sectors than expected:
1254 WARN_ON_ONCE(io->op.i_sectors_delta > 0);
1257 * (error (due to going RO) halfway through a page can screw that up
1260 BUG_ON(io->op.op.i_sectors_delta >= PAGE_SECTORS);
1264 * PageWriteback is effectively our ref on the inode - fixup i_blocks
1265 * before calling end_page_writeback:
1267 i_sectors_acct(c, io->inode, NULL, io->op.i_sectors_delta);
1269 bio_for_each_segment_all(bvec, bio, iter) {
1270 struct bch_page_state *s = __bch2_page_state(bvec->bv_page);
1272 if (atomic_dec_and_test(&s->write_count))
1273 end_page_writeback(bvec->bv_page);
1276 closure_return_with_destructor(&io->cl, bch2_writepage_io_free);
1279 static void bch2_writepage_do_io(struct bch_writepage_state *w)
1281 struct bch_writepage_io *io = w->io;
1284 closure_call(&io->op.cl, bch2_write, NULL, &io->cl);
1285 continue_at(&io->cl, bch2_writepage_io_done, NULL);
1289 * Get a bch_writepage_io and add @page to it - appending to an existing one if
1290 * possible, else allocating a new one:
1292 static void bch2_writepage_io_alloc(struct bch_fs *c,
1293 struct writeback_control *wbc,
1294 struct bch_writepage_state *w,
1295 struct bch_inode_info *inode,
1297 unsigned nr_replicas)
1299 struct bch_write_op *op;
1301 w->io = container_of(bio_alloc_bioset(NULL, BIO_MAX_VECS,
1304 &c->writepage_bioset),
1305 struct bch_writepage_io, op.wbio.bio);
1307 closure_init(&w->io->cl, NULL);
1308 w->io->inode = inode;
1311 bch2_write_op_init(op, c, w->opts);
1312 op->target = w->opts.foreground_target;
1313 op->nr_replicas = nr_replicas;
1314 op->res.nr_replicas = nr_replicas;
1315 op->write_point = writepoint_hashed(inode->ei_last_dirtied);
1316 op->subvol = inode->ei_subvol;
1317 op->pos = POS(inode->v.i_ino, sector);
1318 op->wbio.bio.bi_iter.bi_sector = sector;
1319 op->wbio.bio.bi_opf = wbc_to_write_flags(wbc);
1322 static int __bch2_writepage(struct page *page,
1323 struct writeback_control *wbc,
1326 struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
1327 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1328 struct bch_writepage_state *w = data;
1329 struct bch_page_state *s, orig;
1330 unsigned i, offset, nr_replicas_this_write = U32_MAX;
1331 loff_t i_size = i_size_read(&inode->v);
1332 pgoff_t end_index = i_size >> PAGE_SHIFT;
1335 EBUG_ON(!PageUptodate(page));
1337 /* Is the page fully inside i_size? */
1338 if (page->index < end_index)
1341 /* Is the page fully outside i_size? (truncate in progress) */
1342 offset = i_size & (PAGE_SIZE - 1);
1343 if (page->index > end_index || !offset) {
1349 * The page straddles i_size. It must be zeroed out on each and every
1350 * writepage invocation because it may be mmapped. "A file is mapped
1351 * in multiples of the page size. For a file that is not a multiple of
1352 * the page size, the remaining memory is zeroed when mapped, and
1353 * writes to that region are not written out to the file."
1355 zero_user_segment(page, offset, PAGE_SIZE);
1357 s = bch2_page_state_create(page, __GFP_NOFAIL);
1360 * Things get really hairy with errors during writeback:
1362 ret = bch2_get_page_disk_reservation(c, inode, page, false);
1365 /* Before unlocking the page, get copy of reservations: */
1366 spin_lock(&s->lock);
1368 spin_unlock(&s->lock);
1370 for (i = 0; i < PAGE_SECTORS; i++) {
1371 if (s->s[i].state < SECTOR_DIRTY)
1374 nr_replicas_this_write =
1375 min_t(unsigned, nr_replicas_this_write,
1376 s->s[i].nr_replicas +
1377 s->s[i].replicas_reserved);
1380 for (i = 0; i < PAGE_SECTORS; i++) {
1381 if (s->s[i].state < SECTOR_DIRTY)
1384 s->s[i].nr_replicas = w->opts.compression
1385 ? 0 : nr_replicas_this_write;
1387 s->s[i].replicas_reserved = 0;
1388 s->s[i].state = SECTOR_ALLOCATED;
1391 BUG_ON(atomic_read(&s->write_count));
1392 atomic_set(&s->write_count, 1);
1394 BUG_ON(PageWriteback(page));
1395 set_page_writeback(page);
1401 unsigned sectors = 0, dirty_sectors = 0, reserved_sectors = 0;
1404 while (offset < PAGE_SECTORS &&
1405 orig.s[offset].state < SECTOR_DIRTY)
1408 if (offset == PAGE_SECTORS)
1411 while (offset + sectors < PAGE_SECTORS &&
1412 orig.s[offset + sectors].state >= SECTOR_DIRTY) {
1413 reserved_sectors += orig.s[offset + sectors].replicas_reserved;
1414 dirty_sectors += orig.s[offset + sectors].state == SECTOR_DIRTY;
1419 sector = ((u64) page->index << PAGE_SECTORS_SHIFT) + offset;
1422 (w->io->op.res.nr_replicas != nr_replicas_this_write ||
1423 bio_full(&w->io->op.wbio.bio, PAGE_SIZE) ||
1424 w->io->op.wbio.bio.bi_iter.bi_size + (sectors << 9) >=
1425 (BIO_MAX_VECS * PAGE_SIZE) ||
1426 bio_end_sector(&w->io->op.wbio.bio) != sector))
1427 bch2_writepage_do_io(w);
1430 bch2_writepage_io_alloc(c, wbc, w, inode, sector,
1431 nr_replicas_this_write);
1433 atomic_inc(&s->write_count);
1435 BUG_ON(inode != w->io->inode);
1436 BUG_ON(!bio_add_page(&w->io->op.wbio.bio, page,
1437 sectors << 9, offset << 9));
1439 /* Check for writing past i_size: */
1440 WARN_ON_ONCE((bio_end_sector(&w->io->op.wbio.bio) << 9) >
1441 round_up(i_size, block_bytes(c)));
1443 w->io->op.res.sectors += reserved_sectors;
1444 w->io->op.i_sectors_delta -= dirty_sectors;
1445 w->io->op.new_i_size = i_size;
1450 if (atomic_dec_and_test(&s->write_count))
1451 end_page_writeback(page);
1456 int bch2_writepages(struct address_space *mapping, struct writeback_control *wbc)
1458 struct bch_fs *c = mapping->host->i_sb->s_fs_info;
1459 struct bch_writepage_state w =
1460 bch_writepage_state_init(c, to_bch_ei(mapping->host));
1461 struct blk_plug plug;
1464 blk_start_plug(&plug);
1465 ret = write_cache_pages(mapping, wbc, __bch2_writepage, &w);
1467 bch2_writepage_do_io(&w);
1468 blk_finish_plug(&plug);
1469 return bch2_err_class(ret);
1472 /* buffered writes: */
1474 int bch2_write_begin(struct file *file, struct address_space *mapping,
1475 loff_t pos, unsigned len,
1476 struct page **pagep, void **fsdata)
1478 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1479 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1480 struct bch2_page_reservation *res;
1481 pgoff_t index = pos >> PAGE_SHIFT;
1482 unsigned offset = pos & (PAGE_SIZE - 1);
1486 res = kmalloc(sizeof(*res), GFP_KERNEL);
1490 bch2_page_reservation_init(c, inode, res);
1493 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1495 page = grab_cache_page_write_begin(mapping, index);
1499 if (PageUptodate(page))
1502 /* If we're writing entire page, don't need to read it in first: */
1503 if (len == PAGE_SIZE)
1506 if (!offset && pos + len >= inode->v.i_size) {
1507 zero_user_segment(page, len, PAGE_SIZE);
1508 flush_dcache_page(page);
1512 if (index > inode->v.i_size >> PAGE_SHIFT) {
1513 zero_user_segments(page, 0, offset, offset + len, PAGE_SIZE);
1514 flush_dcache_page(page);
1518 ret = bch2_read_single_page(page, mapping);
1522 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
1523 ret = bch2_page_state_set(c, inode_inum(inode), &page, 1);
1528 ret = bch2_page_reservation_get(c, inode, page, res, offset, len);
1530 if (!PageUptodate(page)) {
1532 * If the page hasn't been read in, we won't know if we
1533 * actually need a reservation - we don't actually need
1534 * to read here, we just need to check if the page is
1535 * fully backed by uncompressed data:
1550 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1553 return bch2_err_class(ret);
1556 int bch2_write_end(struct file *file, struct address_space *mapping,
1557 loff_t pos, unsigned len, unsigned copied,
1558 struct page *page, void *fsdata)
1560 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1561 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1562 struct bch2_page_reservation *res = fsdata;
1563 unsigned offset = pos & (PAGE_SIZE - 1);
1565 lockdep_assert_held(&inode->v.i_rwsem);
1567 if (unlikely(copied < len && !PageUptodate(page))) {
1569 * The page needs to be read in, but that would destroy
1570 * our partial write - simplest thing is to just force
1571 * userspace to redo the write:
1573 zero_user(page, 0, PAGE_SIZE);
1574 flush_dcache_page(page);
1578 spin_lock(&inode->v.i_lock);
1579 if (pos + copied > inode->v.i_size)
1580 i_size_write(&inode->v, pos + copied);
1581 spin_unlock(&inode->v.i_lock);
1584 if (!PageUptodate(page))
1585 SetPageUptodate(page);
1587 bch2_set_page_dirty(c, inode, page, res, offset, copied);
1589 inode->ei_last_dirtied = (unsigned long) current;
1594 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1596 bch2_page_reservation_put(c, inode, res);
1602 #define WRITE_BATCH_PAGES 32
1604 static int __bch2_buffered_write(struct bch_inode_info *inode,
1605 struct address_space *mapping,
1606 struct iov_iter *iter,
1607 loff_t pos, unsigned len)
1609 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1610 struct page *pages[WRITE_BATCH_PAGES];
1611 struct bch2_page_reservation res;
1612 unsigned long index = pos >> PAGE_SHIFT;
1613 unsigned offset = pos & (PAGE_SIZE - 1);
1614 unsigned nr_pages = DIV_ROUND_UP(offset + len, PAGE_SIZE);
1615 unsigned i, reserved = 0, set_dirty = 0;
1616 unsigned copied = 0, nr_pages_copied = 0;
1620 BUG_ON(nr_pages > ARRAY_SIZE(pages));
1622 bch2_page_reservation_init(c, inode, &res);
1624 for (i = 0; i < nr_pages; i++) {
1625 pages[i] = grab_cache_page_write_begin(mapping, index + i);
1632 len = min_t(unsigned, len,
1633 nr_pages * PAGE_SIZE - offset);
1638 if (offset && !PageUptodate(pages[0])) {
1639 ret = bch2_read_single_page(pages[0], mapping);
1644 if ((pos + len) & (PAGE_SIZE - 1) &&
1645 !PageUptodate(pages[nr_pages - 1])) {
1646 if ((index + nr_pages - 1) << PAGE_SHIFT >= inode->v.i_size) {
1647 zero_user(pages[nr_pages - 1], 0, PAGE_SIZE);
1649 ret = bch2_read_single_page(pages[nr_pages - 1], mapping);
1655 while (reserved < len) {
1656 unsigned i = (offset + reserved) >> PAGE_SHIFT;
1657 struct page *page = pages[i];
1658 unsigned pg_offset = (offset + reserved) & (PAGE_SIZE - 1);
1659 unsigned pg_len = min_t(unsigned, len - reserved,
1660 PAGE_SIZE - pg_offset);
1662 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
1663 ret = bch2_page_state_set(c, inode_inum(inode),
1664 pages + i, nr_pages - i);
1669 ret = bch2_page_reservation_get(c, inode, page, &res,
1677 if (mapping_writably_mapped(mapping))
1678 for (i = 0; i < nr_pages; i++)
1679 flush_dcache_page(pages[i]);
1681 while (copied < len) {
1682 struct page *page = pages[(offset + copied) >> PAGE_SHIFT];
1683 unsigned pg_offset = (offset + copied) & (PAGE_SIZE - 1);
1684 unsigned pg_len = min_t(unsigned, len - copied,
1685 PAGE_SIZE - pg_offset);
1686 unsigned pg_copied = copy_page_from_iter_atomic(page,
1687 pg_offset, pg_len,iter);
1692 if (!PageUptodate(page) &&
1693 pg_copied != PAGE_SIZE &&
1694 pos + copied + pg_copied < inode->v.i_size) {
1695 zero_user(page, 0, PAGE_SIZE);
1699 flush_dcache_page(page);
1700 copied += pg_copied;
1702 if (pg_copied != pg_len)
1709 spin_lock(&inode->v.i_lock);
1710 if (pos + copied > inode->v.i_size)
1711 i_size_write(&inode->v, pos + copied);
1712 spin_unlock(&inode->v.i_lock);
1714 while (set_dirty < copied) {
1715 struct page *page = pages[(offset + set_dirty) >> PAGE_SHIFT];
1716 unsigned pg_offset = (offset + set_dirty) & (PAGE_SIZE - 1);
1717 unsigned pg_len = min_t(unsigned, copied - set_dirty,
1718 PAGE_SIZE - pg_offset);
1720 if (!PageUptodate(page))
1721 SetPageUptodate(page);
1723 bch2_set_page_dirty(c, inode, page, &res, pg_offset, pg_len);
1727 set_dirty += pg_len;
1730 nr_pages_copied = DIV_ROUND_UP(offset + copied, PAGE_SIZE);
1731 inode->ei_last_dirtied = (unsigned long) current;
1733 for (i = nr_pages_copied; i < nr_pages; i++) {
1734 unlock_page(pages[i]);
1738 bch2_page_reservation_put(c, inode, &res);
1740 return copied ?: ret;
1743 static ssize_t bch2_buffered_write(struct kiocb *iocb, struct iov_iter *iter)
1745 struct file *file = iocb->ki_filp;
1746 struct address_space *mapping = file->f_mapping;
1747 struct bch_inode_info *inode = file_bch_inode(file);
1748 loff_t pos = iocb->ki_pos;
1749 ssize_t written = 0;
1752 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1755 unsigned offset = pos & (PAGE_SIZE - 1);
1756 unsigned bytes = min_t(unsigned long, iov_iter_count(iter),
1757 PAGE_SIZE * WRITE_BATCH_PAGES - offset);
1760 * Bring in the user page that we will copy from _first_.
1761 * Otherwise there's a nasty deadlock on copying from the
1762 * same page as we're writing to, without it being marked
1765 * Not only is this an optimisation, but it is also required
1766 * to check that the address is actually valid, when atomic
1767 * usercopies are used, below.
1769 if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
1770 bytes = min_t(unsigned long, iov_iter_count(iter),
1771 PAGE_SIZE - offset);
1773 if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
1779 if (unlikely(fatal_signal_pending(current))) {
1784 ret = __bch2_buffered_write(inode, mapping, iter, pos, bytes);
1785 if (unlikely(ret < 0))
1790 if (unlikely(ret == 0)) {
1792 * If we were unable to copy any data at all, we must
1793 * fall back to a single segment length write.
1795 * If we didn't fallback here, we could livelock
1796 * because not all segments in the iov can be copied at
1797 * once without a pagefault.
1799 bytes = min_t(unsigned long, PAGE_SIZE - offset,
1800 iov_iter_single_seg_count(iter));
1807 balance_dirty_pages_ratelimited(mapping);
1808 } while (iov_iter_count(iter));
1810 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1812 return written ? written : ret;
1815 /* O_DIRECT reads */
1817 static void bio_check_or_release(struct bio *bio, bool check_dirty)
1820 bio_check_pages_dirty(bio);
1822 bio_release_pages(bio, false);
1827 static void bch2_dio_read_complete(struct closure *cl)
1829 struct dio_read *dio = container_of(cl, struct dio_read, cl);
1831 dio->req->ki_complete(dio->req, dio->ret);
1832 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
1835 static void bch2_direct_IO_read_endio(struct bio *bio)
1837 struct dio_read *dio = bio->bi_private;
1840 dio->ret = blk_status_to_errno(bio->bi_status);
1842 closure_put(&dio->cl);
1845 static void bch2_direct_IO_read_split_endio(struct bio *bio)
1847 struct dio_read *dio = bio->bi_private;
1848 bool should_dirty = dio->should_dirty;
1850 bch2_direct_IO_read_endio(bio);
1851 bio_check_or_release(bio, should_dirty);
1854 static int bch2_direct_IO_read(struct kiocb *req, struct iov_iter *iter)
1856 struct file *file = req->ki_filp;
1857 struct bch_inode_info *inode = file_bch_inode(file);
1858 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1859 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1860 struct dio_read *dio;
1862 loff_t offset = req->ki_pos;
1863 bool sync = is_sync_kiocb(req);
1867 if ((offset|iter->count) & (block_bytes(c) - 1))
1870 ret = min_t(loff_t, iter->count,
1871 max_t(loff_t, 0, i_size_read(&inode->v) - offset));
1876 shorten = iov_iter_count(iter) - round_up(ret, block_bytes(c));
1877 iter->count -= shorten;
1879 bio = bio_alloc_bioset(NULL,
1880 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
1883 &c->dio_read_bioset);
1885 bio->bi_end_io = bch2_direct_IO_read_endio;
1887 dio = container_of(bio, struct dio_read, rbio.bio);
1888 closure_init(&dio->cl, NULL);
1891 * this is a _really_ horrible hack just to avoid an atomic sub at the
1895 set_closure_fn(&dio->cl, bch2_dio_read_complete, NULL);
1896 atomic_set(&dio->cl.remaining,
1897 CLOSURE_REMAINING_INITIALIZER -
1899 CLOSURE_DESTRUCTOR);
1901 atomic_set(&dio->cl.remaining,
1902 CLOSURE_REMAINING_INITIALIZER + 1);
1908 * This is one of the sketchier things I've encountered: we have to skip
1909 * the dirtying of requests that are internal from the kernel (i.e. from
1910 * loopback), because we'll deadlock on page_lock.
1912 dio->should_dirty = iter_is_iovec(iter);
1915 while (iter->count) {
1916 bio = bio_alloc_bioset(NULL,
1917 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
1921 bio->bi_end_io = bch2_direct_IO_read_split_endio;
1923 bio_set_op_attrs(bio, REQ_OP_READ, REQ_SYNC);
1924 bio->bi_iter.bi_sector = offset >> 9;
1925 bio->bi_private = dio;
1927 ret = bio_iov_iter_get_pages(bio, iter);
1929 /* XXX: fault inject this path */
1930 bio->bi_status = BLK_STS_RESOURCE;
1935 offset += bio->bi_iter.bi_size;
1937 if (dio->should_dirty)
1938 bio_set_pages_dirty(bio);
1941 closure_get(&dio->cl);
1943 bch2_read(c, rbio_init(bio, opts), inode_inum(inode));
1946 iter->count += shorten;
1949 closure_sync(&dio->cl);
1950 closure_debug_destroy(&dio->cl);
1952 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
1955 return -EIOCBQUEUED;
1959 ssize_t bch2_read_iter(struct kiocb *iocb, struct iov_iter *iter)
1961 struct file *file = iocb->ki_filp;
1962 struct bch_inode_info *inode = file_bch_inode(file);
1963 struct address_space *mapping = file->f_mapping;
1964 size_t count = iov_iter_count(iter);
1968 return 0; /* skip atime */
1970 if (iocb->ki_flags & IOCB_DIRECT) {
1971 struct blk_plug plug;
1973 ret = filemap_write_and_wait_range(mapping,
1975 iocb->ki_pos + count - 1);
1979 file_accessed(file);
1981 blk_start_plug(&plug);
1982 ret = bch2_direct_IO_read(iocb, iter);
1983 blk_finish_plug(&plug);
1986 iocb->ki_pos += ret;
1988 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1989 ret = generic_file_read_iter(iocb, iter);
1990 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1993 return bch2_err_class(ret);
1996 /* O_DIRECT writes */
1998 static bool bch2_check_range_allocated(struct bch_fs *c, subvol_inum inum,
1999 u64 offset, u64 size,
2000 unsigned nr_replicas, bool compressed)
2002 struct btree_trans trans;
2003 struct btree_iter iter;
2005 u64 end = offset + size;
2010 bch2_trans_init(&trans, c, 0, 0);
2012 bch2_trans_begin(&trans);
2014 err = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
2018 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
2019 SPOS(inum.inum, offset, snapshot),
2020 BTREE_ITER_SLOTS, k, err) {
2021 if (bkey_cmp(bkey_start_pos(k.k), POS(inum.inum, end)) >= 0)
2024 if (k.k->p.snapshot != snapshot ||
2025 nr_replicas > bch2_bkey_replicas(c, k) ||
2026 (!compressed && bch2_bkey_sectors_compressed(k))) {
2032 offset = iter.pos.offset;
2033 bch2_trans_iter_exit(&trans, &iter);
2035 if (bch2_err_matches(err, BCH_ERR_transaction_restart))
2037 bch2_trans_exit(&trans);
2039 return err ? false : ret;
2042 static void bch2_dio_write_loop_async(struct bch_write_op *);
2044 static long bch2_dio_write_loop(struct dio_write *dio)
2046 bool kthread = (current->flags & PF_KTHREAD) != 0;
2047 struct kiocb *req = dio->req;
2048 struct address_space *mapping = req->ki_filp->f_mapping;
2049 struct bch_inode_info *inode = file_bch_inode(req->ki_filp);
2050 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2051 struct bio *bio = &dio->op.wbio.bio;
2052 struct bvec_iter_all iter;
2054 unsigned unaligned, iter_count;
2055 bool sync = dio->sync, dropped_locks;
2062 iter_count = dio->iter.count;
2064 if (kthread && dio->mm)
2065 kthread_use_mm(dio->mm);
2066 BUG_ON(current->faults_disabled_mapping);
2067 current->faults_disabled_mapping = mapping;
2069 ret = bio_iov_iter_get_pages(bio, &dio->iter);
2071 dropped_locks = fdm_dropped_locks();
2073 current->faults_disabled_mapping = NULL;
2074 if (kthread && dio->mm)
2075 kthread_unuse_mm(dio->mm);
2078 * If the fault handler returned an error but also signalled
2079 * that it dropped & retook ei_pagecache_lock, we just need to
2080 * re-shoot down the page cache and retry:
2082 if (dropped_locks && ret)
2085 if (unlikely(ret < 0))
2088 if (unlikely(dropped_locks)) {
2089 ret = write_invalidate_inode_pages_range(mapping,
2091 req->ki_pos + iter_count - 1);
2095 if (!bio->bi_iter.bi_size)
2099 unaligned = bio->bi_iter.bi_size & (block_bytes(c) - 1);
2100 bio->bi_iter.bi_size -= unaligned;
2101 iov_iter_revert(&dio->iter, unaligned);
2103 if (!bio->bi_iter.bi_size) {
2105 * bio_iov_iter_get_pages was only able to get <
2106 * blocksize worth of pages:
2112 bch2_write_op_init(&dio->op, c, io_opts(c, &inode->ei_inode));
2113 dio->op.end_io = bch2_dio_write_loop_async;
2114 dio->op.target = dio->op.opts.foreground_target;
2115 dio->op.write_point = writepoint_hashed((unsigned long) current);
2116 dio->op.nr_replicas = dio->op.opts.data_replicas;
2117 dio->op.subvol = inode->ei_subvol;
2118 dio->op.pos = POS(inode->v.i_ino, (u64) req->ki_pos >> 9);
2120 if ((req->ki_flags & IOCB_DSYNC) &&
2121 !c->opts.journal_flush_disabled)
2122 dio->op.flags |= BCH_WRITE_FLUSH;
2123 dio->op.flags |= BCH_WRITE_CHECK_ENOSPC;
2125 ret = bch2_disk_reservation_get(c, &dio->op.res, bio_sectors(bio),
2126 dio->op.opts.data_replicas, 0);
2127 if (unlikely(ret) &&
2128 !bch2_check_range_allocated(c, inode_inum(inode),
2129 dio->op.pos.offset, bio_sectors(bio),
2130 dio->op.opts.data_replicas,
2131 dio->op.opts.compression != 0))
2134 task_io_account_write(bio->bi_iter.bi_size);
2136 if (!dio->sync && !dio->loop && dio->iter.count) {
2137 struct iovec *iov = dio->inline_vecs;
2139 if (dio->iter.nr_segs > ARRAY_SIZE(dio->inline_vecs)) {
2140 iov = kmalloc(dio->iter.nr_segs * sizeof(*iov),
2142 if (unlikely(!iov)) {
2143 dio->sync = sync = true;
2147 dio->free_iov = true;
2150 memcpy(iov, dio->iter.iov, dio->iter.nr_segs * sizeof(*iov));
2151 dio->iter.iov = iov;
2155 closure_call(&dio->op.cl, bch2_write, NULL, NULL);
2158 wait_for_completion(&dio->done);
2160 return -EIOCBQUEUED;
2162 i_sectors_acct(c, inode, &dio->quota_res,
2163 dio->op.i_sectors_delta);
2164 req->ki_pos += (u64) dio->op.written << 9;
2165 dio->written += dio->op.written;
2167 spin_lock(&inode->v.i_lock);
2168 if (req->ki_pos > inode->v.i_size)
2169 i_size_write(&inode->v, req->ki_pos);
2170 spin_unlock(&inode->v.i_lock);
2172 if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
2173 bio_for_each_segment_all(bv, bio, iter)
2174 put_page(bv->bv_page);
2177 if (dio->op.error) {
2178 set_bit(EI_INODE_ERROR, &inode->ei_flags);
2182 if (!dio->iter.count)
2185 bio_reset(bio, NULL, REQ_OP_WRITE);
2186 reinit_completion(&dio->done);
2189 ret = dio->op.error ?: ((long) dio->written << 9);
2191 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2192 bch2_quota_reservation_put(c, inode, &dio->quota_res);
2195 kfree(dio->iter.iov);
2197 if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
2198 bio_for_each_segment_all(bv, bio, iter)
2199 put_page(bv->bv_page);
2202 /* inode->i_dio_count is our ref on inode and thus bch_fs */
2203 inode_dio_end(&inode->v);
2206 ret = bch2_err_class(ret);
2209 req->ki_complete(req, ret);
2215 static void bch2_dio_write_loop_async(struct bch_write_op *op)
2217 struct dio_write *dio = container_of(op, struct dio_write, op);
2220 complete(&dio->done);
2222 bch2_dio_write_loop(dio);
2226 ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
2228 struct file *file = req->ki_filp;
2229 struct address_space *mapping = file->f_mapping;
2230 struct bch_inode_info *inode = file_bch_inode(file);
2231 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2232 struct dio_write *dio;
2234 bool locked = true, extending;
2238 prefetch((void *) &c->opts + 64);
2239 prefetch(&inode->ei_inode);
2240 prefetch((void *) &inode->ei_inode + 64);
2242 inode_lock(&inode->v);
2244 ret = generic_write_checks(req, iter);
2245 if (unlikely(ret <= 0))
2248 ret = file_remove_privs(file);
2252 ret = file_update_time(file);
2256 if (unlikely((req->ki_pos|iter->count) & (block_bytes(c) - 1)))
2259 inode_dio_begin(&inode->v);
2260 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
2262 extending = req->ki_pos + iter->count > inode->v.i_size;
2264 inode_unlock(&inode->v);
2268 bio = bio_alloc_bioset(NULL,
2269 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
2272 &c->dio_write_bioset);
2273 dio = container_of(bio, struct dio_write, op.wbio.bio);
2274 init_completion(&dio->done);
2276 dio->mm = current->mm;
2278 dio->sync = is_sync_kiocb(req) || extending;
2279 dio->free_iov = false;
2280 dio->quota_res.sectors = 0;
2284 ret = bch2_quota_reservation_add(c, inode, &dio->quota_res,
2285 iter->count >> 9, true);
2289 ret = write_invalidate_inode_pages_range(mapping,
2291 req->ki_pos + iter->count - 1);
2295 ret = bch2_dio_write_loop(dio);
2298 inode_unlock(&inode->v);
2301 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2302 bch2_quota_reservation_put(c, inode, &dio->quota_res);
2304 inode_dio_end(&inode->v);
2308 ssize_t bch2_write_iter(struct kiocb *iocb, struct iov_iter *from)
2310 struct file *file = iocb->ki_filp;
2311 struct bch_inode_info *inode = file_bch_inode(file);
2314 if (iocb->ki_flags & IOCB_DIRECT) {
2315 ret = bch2_direct_write(iocb, from);
2319 /* We can write back this queue in page reclaim */
2320 current->backing_dev_info = inode_to_bdi(&inode->v);
2321 inode_lock(&inode->v);
2323 ret = generic_write_checks(iocb, from);
2327 ret = file_remove_privs(file);
2331 ret = file_update_time(file);
2335 ret = bch2_buffered_write(iocb, from);
2336 if (likely(ret > 0))
2337 iocb->ki_pos += ret;
2339 inode_unlock(&inode->v);
2340 current->backing_dev_info = NULL;
2343 ret = generic_write_sync(iocb, ret);
2345 return bch2_err_class(ret);
2351 * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an
2352 * insert trigger: look up the btree inode instead
2354 static int bch2_flush_inode(struct bch_fs *c, subvol_inum inum)
2356 struct bch_inode_unpacked inode;
2359 if (c->opts.journal_flush_disabled)
2362 ret = bch2_inode_find_by_inum(c, inum, &inode);
2366 return bch2_journal_flush_seq(&c->journal, inode.bi_journal_seq);
2369 int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2371 struct bch_inode_info *inode = file_bch_inode(file);
2372 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2373 int ret, ret2, ret3;
2375 ret = file_write_and_wait_range(file, start, end);
2376 ret2 = sync_inode_metadata(&inode->v, 1);
2377 ret3 = bch2_flush_inode(c, inode_inum(inode));
2379 return bch2_err_class(ret ?: ret2 ?: ret3);
2384 static inline int range_has_data(struct bch_fs *c, u32 subvol,
2388 struct btree_trans trans;
2389 struct btree_iter iter;
2393 bch2_trans_init(&trans, c, 0, 0);
2395 bch2_trans_begin(&trans);
2397 ret = bch2_subvolume_get_snapshot(&trans, subvol, &start.snapshot);
2401 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents, start, 0, k, ret) {
2402 if (bkey_cmp(bkey_start_pos(k.k), end) >= 0)
2405 if (bkey_extent_is_data(k.k)) {
2411 bch2_trans_iter_exit(&trans, &iter);
2413 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
2416 bch2_trans_exit(&trans);
2420 static int __bch2_truncate_page(struct bch_inode_info *inode,
2421 pgoff_t index, loff_t start, loff_t end)
2423 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2424 struct address_space *mapping = inode->v.i_mapping;
2425 struct bch_page_state *s;
2426 unsigned start_offset = start & (PAGE_SIZE - 1);
2427 unsigned end_offset = ((end - 1) & (PAGE_SIZE - 1)) + 1;
2430 s64 i_sectors_delta = 0;
2433 /* Page boundary? Nothing to do */
2434 if (!((index == start >> PAGE_SHIFT && start_offset) ||
2435 (index == end >> PAGE_SHIFT && end_offset != PAGE_SIZE)))
2439 if (index << PAGE_SHIFT >= inode->v.i_size)
2442 page = find_lock_page(mapping, index);
2445 * XXX: we're doing two index lookups when we end up reading the
2448 ret = range_has_data(c, inode->ei_subvol,
2449 POS(inode->v.i_ino, index << PAGE_SECTORS_SHIFT),
2450 POS(inode->v.i_ino, (index + 1) << PAGE_SECTORS_SHIFT));
2454 page = find_or_create_page(mapping, index, GFP_KERNEL);
2455 if (unlikely(!page)) {
2461 s = bch2_page_state_create(page, 0);
2467 if (!PageUptodate(page)) {
2468 ret = bch2_read_single_page(page, mapping);
2473 if (index != start >> PAGE_SHIFT)
2475 if (index != end >> PAGE_SHIFT)
2476 end_offset = PAGE_SIZE;
2478 for (i = round_up(start_offset, block_bytes(c)) >> 9;
2479 i < round_down(end_offset, block_bytes(c)) >> 9;
2481 s->s[i].nr_replicas = 0;
2482 if (s->s[i].state == SECTOR_DIRTY)
2484 s->s[i].state = SECTOR_UNALLOCATED;
2487 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2490 * Caller needs to know whether this page will be written out by
2491 * writeback - doing an i_size update if necessary - or whether it will
2492 * be responsible for the i_size update:
2494 ret = s->s[(min_t(u64, inode->v.i_size - (index << PAGE_SHIFT),
2495 PAGE_SIZE) - 1) >> 9].state >= SECTOR_DIRTY;
2497 zero_user_segment(page, start_offset, end_offset);
2500 * Bit of a hack - we don't want truncate to fail due to -ENOSPC.
2502 * XXX: because we aren't currently tracking whether the page has actual
2503 * data in it (vs. just 0s, or only partially written) this wrong. ick.
2505 BUG_ON(bch2_get_page_disk_reservation(c, inode, page, false));
2508 * This removes any writeable userspace mappings; we need to force
2509 * .page_mkwrite to be called again before any mmapped writes, to
2510 * redirty the full page:
2513 __set_page_dirty_nobuffers(page);
2521 static int bch2_truncate_page(struct bch_inode_info *inode, loff_t from)
2523 return __bch2_truncate_page(inode, from >> PAGE_SHIFT,
2524 from, round_up(from, PAGE_SIZE));
2527 static int bch2_truncate_pages(struct bch_inode_info *inode,
2528 loff_t start, loff_t end)
2530 int ret = __bch2_truncate_page(inode, start >> PAGE_SHIFT,
2534 start >> PAGE_SHIFT != end >> PAGE_SHIFT)
2535 ret = __bch2_truncate_page(inode,
2541 static int bch2_extend(struct user_namespace *mnt_userns,
2542 struct bch_inode_info *inode,
2543 struct bch_inode_unpacked *inode_u,
2544 struct iattr *iattr)
2546 struct address_space *mapping = inode->v.i_mapping;
2552 * this has to be done _before_ extending i_size:
2554 ret = filemap_write_and_wait_range(mapping, inode_u->bi_size, S64_MAX);
2558 truncate_setsize(&inode->v, iattr->ia_size);
2560 return bch2_setattr_nonsize(mnt_userns, inode, iattr);
2563 static int bch2_truncate_finish_fn(struct bch_inode_info *inode,
2564 struct bch_inode_unpacked *bi,
2567 bi->bi_flags &= ~BCH_INODE_I_SIZE_DIRTY;
2571 static int bch2_truncate_start_fn(struct bch_inode_info *inode,
2572 struct bch_inode_unpacked *bi, void *p)
2574 u64 *new_i_size = p;
2576 bi->bi_flags |= BCH_INODE_I_SIZE_DIRTY;
2577 bi->bi_size = *new_i_size;
2581 int bch2_truncate(struct user_namespace *mnt_userns,
2582 struct bch_inode_info *inode, struct iattr *iattr)
2584 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2585 struct address_space *mapping = inode->v.i_mapping;
2586 struct bch_inode_unpacked inode_u;
2587 u64 new_i_size = iattr->ia_size;
2588 s64 i_sectors_delta = 0;
2592 * If the truncate call with change the size of the file, the
2593 * cmtimes should be updated. If the size will not change, we
2594 * do not need to update the cmtimes.
2596 if (iattr->ia_size != inode->v.i_size) {
2597 if (!(iattr->ia_valid & ATTR_MTIME))
2598 ktime_get_coarse_real_ts64(&iattr->ia_mtime);
2599 if (!(iattr->ia_valid & ATTR_CTIME))
2600 ktime_get_coarse_real_ts64(&iattr->ia_ctime);
2601 iattr->ia_valid |= ATTR_MTIME|ATTR_CTIME;
2604 inode_dio_wait(&inode->v);
2605 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
2607 ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);
2612 * check this before next assertion; on filesystem error our normal
2613 * invariants are a bit broken (truncate has to truncate the page cache
2614 * before the inode).
2616 ret = bch2_journal_error(&c->journal);
2620 WARN_ON(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
2621 inode->v.i_size < inode_u.bi_size);
2623 if (iattr->ia_size > inode->v.i_size) {
2624 ret = bch2_extend(mnt_userns, inode, &inode_u, iattr);
2628 iattr->ia_valid &= ~ATTR_SIZE;
2630 ret = bch2_truncate_page(inode, iattr->ia_size);
2631 if (unlikely(ret < 0))
2635 * When extending, we're going to write the new i_size to disk
2636 * immediately so we need to flush anything above the current on disk
2639 * Also, when extending we need to flush the page that i_size currently
2640 * straddles - if it's mapped to userspace, we need to ensure that
2641 * userspace has to redirty it and call .mkwrite -> set_page_dirty
2642 * again to allocate the part of the page that was extended.
2644 if (iattr->ia_size > inode_u.bi_size)
2645 ret = filemap_write_and_wait_range(mapping,
2647 iattr->ia_size - 1);
2648 else if (iattr->ia_size & (PAGE_SIZE - 1))
2649 ret = filemap_write_and_wait_range(mapping,
2650 round_down(iattr->ia_size, PAGE_SIZE),
2651 iattr->ia_size - 1);
2655 mutex_lock(&inode->ei_update_lock);
2656 ret = bch2_write_inode(c, inode, bch2_truncate_start_fn,
2658 mutex_unlock(&inode->ei_update_lock);
2663 truncate_setsize(&inode->v, iattr->ia_size);
2665 ret = bch2_fpunch(c, inode_inum(inode),
2666 round_up(iattr->ia_size, block_bytes(c)) >> 9,
2667 U64_MAX, &i_sectors_delta);
2668 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2670 bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&
2671 !bch2_journal_error(&c->journal), c,
2672 "inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",
2673 inode->v.i_ino, (u64) inode->v.i_blocks,
2674 inode->ei_inode.bi_sectors);
2678 mutex_lock(&inode->ei_update_lock);
2679 ret = bch2_write_inode(c, inode, bch2_truncate_finish_fn, NULL, 0);
2680 mutex_unlock(&inode->ei_update_lock);
2682 ret = bch2_setattr_nonsize(mnt_userns, inode, iattr);
2684 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2685 return bch2_err_class(ret);
2690 static int inode_update_times_fn(struct bch_inode_info *inode,
2691 struct bch_inode_unpacked *bi, void *p)
2693 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2695 bi->bi_mtime = bi->bi_ctime = bch2_current_time(c);
2699 static long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)
2701 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2702 u64 end = offset + len;
2703 u64 block_start = round_up(offset, block_bytes(c));
2704 u64 block_end = round_down(end, block_bytes(c));
2705 bool truncated_last_page;
2708 ret = bch2_truncate_pages(inode, offset, end);
2709 if (unlikely(ret < 0))
2712 truncated_last_page = ret;
2714 truncate_pagecache_range(&inode->v, offset, end - 1);
2716 if (block_start < block_end ) {
2717 s64 i_sectors_delta = 0;
2719 ret = bch2_fpunch(c, inode_inum(inode),
2720 block_start >> 9, block_end >> 9,
2722 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2725 mutex_lock(&inode->ei_update_lock);
2726 if (end >= inode->v.i_size && !truncated_last_page) {
2727 ret = bch2_write_inode_size(c, inode, inode->v.i_size,
2728 ATTR_MTIME|ATTR_CTIME);
2730 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
2731 ATTR_MTIME|ATTR_CTIME);
2733 mutex_unlock(&inode->ei_update_lock);
2738 static long bchfs_fcollapse_finsert(struct bch_inode_info *inode,
2739 loff_t offset, loff_t len,
2742 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2743 struct address_space *mapping = inode->v.i_mapping;
2744 struct bkey_buf copy;
2745 struct btree_trans trans;
2746 struct btree_iter src, dst, del;
2747 loff_t shift, new_size;
2751 if ((offset | len) & (block_bytes(c) - 1))
2755 if (inode->v.i_sb->s_maxbytes - inode->v.i_size < len)
2758 if (offset >= inode->v.i_size)
2761 src_start = U64_MAX;
2764 if (offset + len >= inode->v.i_size)
2767 src_start = offset + len;
2771 new_size = inode->v.i_size + shift;
2773 ret = write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
2778 i_size_write(&inode->v, new_size);
2779 mutex_lock(&inode->ei_update_lock);
2780 ret = bch2_write_inode_size(c, inode, new_size,
2781 ATTR_MTIME|ATTR_CTIME);
2782 mutex_unlock(&inode->ei_update_lock);
2784 s64 i_sectors_delta = 0;
2786 ret = bch2_fpunch(c, inode_inum(inode),
2787 offset >> 9, (offset + len) >> 9,
2789 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2795 bch2_bkey_buf_init(©);
2796 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 1024);
2797 bch2_trans_iter_init(&trans, &src, BTREE_ID_extents,
2798 POS(inode->v.i_ino, src_start >> 9),
2800 bch2_trans_copy_iter(&dst, &src);
2801 bch2_trans_copy_iter(&del, &src);
2804 bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
2805 struct disk_reservation disk_res =
2806 bch2_disk_reservation_init(c, 0);
2807 struct bkey_i delete;
2809 struct bpos next_pos;
2810 struct bpos move_pos = POS(inode->v.i_ino, offset >> 9);
2811 struct bpos atomic_end;
2812 unsigned trigger_flags = 0;
2815 bch2_trans_begin(&trans);
2817 ret = bch2_subvolume_get_snapshot(&trans,
2818 inode->ei_subvol, &snapshot);
2822 bch2_btree_iter_set_snapshot(&src, snapshot);
2823 bch2_btree_iter_set_snapshot(&dst, snapshot);
2824 bch2_btree_iter_set_snapshot(&del, snapshot);
2826 bch2_trans_begin(&trans);
2829 ? bch2_btree_iter_peek_prev(&src)
2830 : bch2_btree_iter_peek(&src);
2831 if ((ret = bkey_err(k)))
2834 if (!k.k || k.k->p.inode != inode->v.i_ino)
2838 bkey_cmp(k.k->p, POS(inode->v.i_ino, offset >> 9)) <= 0)
2841 bch2_bkey_buf_reassemble(©, c, k);
2844 bkey_cmp(bkey_start_pos(k.k), move_pos) < 0)
2845 bch2_cut_front(move_pos, copy.k);
2847 copy.k->k.p.offset += shift >> 9;
2848 bch2_btree_iter_set_pos(&dst, bkey_start_pos(©.k->k));
2850 ret = bch2_extent_atomic_end(&trans, &dst, copy.k, &atomic_end);
2854 if (bkey_cmp(atomic_end, copy.k->k.p)) {
2856 move_pos = atomic_end;
2857 move_pos.offset -= shift >> 9;
2860 bch2_cut_back(atomic_end, copy.k);
2864 bkey_init(&delete.k);
2865 delete.k.p = copy.k->k.p;
2866 delete.k.size = copy.k->k.size;
2867 delete.k.p.offset -= shift >> 9;
2868 bch2_btree_iter_set_pos(&del, bkey_start_pos(&delete.k));
2870 next_pos = insert ? bkey_start_pos(&delete.k) : delete.k.p;
2872 if (copy.k->k.size != k.k->size) {
2873 /* We might end up splitting compressed extents: */
2875 bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy.k));
2877 ret = bch2_disk_reservation_get(c, &disk_res,
2878 copy.k->k.size, nr_ptrs,
2879 BCH_DISK_RESERVATION_NOFAIL);
2883 ret = bch2_btree_iter_traverse(&del) ?:
2884 bch2_trans_update(&trans, &del, &delete, trigger_flags) ?:
2885 bch2_trans_update(&trans, &dst, copy.k, trigger_flags) ?:
2886 bch2_trans_commit(&trans, &disk_res, NULL,
2887 BTREE_INSERT_NOFAIL);
2888 bch2_disk_reservation_put(c, &disk_res);
2891 bch2_btree_iter_set_pos(&src, next_pos);
2893 bch2_trans_iter_exit(&trans, &del);
2894 bch2_trans_iter_exit(&trans, &dst);
2895 bch2_trans_iter_exit(&trans, &src);
2896 bch2_trans_exit(&trans);
2897 bch2_bkey_buf_exit(©, c);
2902 mutex_lock(&inode->ei_update_lock);
2904 i_size_write(&inode->v, new_size);
2905 ret = bch2_write_inode_size(c, inode, new_size,
2906 ATTR_MTIME|ATTR_CTIME);
2908 /* We need an inode update to update bi_journal_seq for fsync: */
2909 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
2910 ATTR_MTIME|ATTR_CTIME);
2912 mutex_unlock(&inode->ei_update_lock);
2916 static int __bchfs_fallocate(struct bch_inode_info *inode, int mode,
2917 u64 start_sector, u64 end_sector)
2919 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2920 struct btree_trans trans;
2921 struct btree_iter iter;
2922 struct bpos end_pos = POS(inode->v.i_ino, end_sector);
2923 unsigned replicas = io_opts(c, &inode->ei_inode).data_replicas;
2926 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 512);
2928 bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
2929 POS(inode->v.i_ino, start_sector),
2930 BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
2932 while (!ret && bkey_cmp(iter.pos, end_pos) < 0) {
2933 s64 i_sectors_delta = 0;
2934 struct disk_reservation disk_res = { 0 };
2935 struct quota_res quota_res = { 0 };
2936 struct bkey_i_reservation reservation;
2941 bch2_trans_begin(&trans);
2943 ret = bch2_subvolume_get_snapshot(&trans,
2944 inode->ei_subvol, &snapshot);
2948 bch2_btree_iter_set_snapshot(&iter, snapshot);
2950 k = bch2_btree_iter_peek_slot(&iter);
2951 if ((ret = bkey_err(k)))
2954 /* already reserved */
2955 if (k.k->type == KEY_TYPE_reservation &&
2956 bkey_s_c_to_reservation(k).v->nr_replicas >= replicas) {
2957 bch2_btree_iter_advance(&iter);
2961 if (bkey_extent_is_data(k.k) &&
2962 !(mode & FALLOC_FL_ZERO_RANGE)) {
2963 bch2_btree_iter_advance(&iter);
2967 bkey_reservation_init(&reservation.k_i);
2968 reservation.k.type = KEY_TYPE_reservation;
2969 reservation.k.p = k.k->p;
2970 reservation.k.size = k.k->size;
2972 bch2_cut_front(iter.pos, &reservation.k_i);
2973 bch2_cut_back(end_pos, &reservation.k_i);
2975 sectors = reservation.k.size;
2976 reservation.v.nr_replicas = bch2_bkey_nr_ptrs_allocated(k);
2978 if (!bkey_extent_is_allocation(k.k)) {
2979 ret = bch2_quota_reservation_add(c, inode,
2986 if (reservation.v.nr_replicas < replicas ||
2987 bch2_bkey_sectors_compressed(k)) {
2988 ret = bch2_disk_reservation_get(c, &disk_res, sectors,
2993 reservation.v.nr_replicas = disk_res.nr_replicas;
2996 ret = bch2_extent_update(&trans, inode_inum(inode), &iter,
2999 0, &i_sectors_delta, true);
3002 i_sectors_acct(c, inode, "a_res, i_sectors_delta);
3004 bch2_quota_reservation_put(c, inode, "a_res);
3005 bch2_disk_reservation_put(c, &disk_res);
3006 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3010 bch2_trans_unlock(&trans); /* lock ordering, before taking pagecache locks: */
3011 mark_pagecache_reserved(inode, start_sector, iter.pos.offset);
3013 if (bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)) {
3014 struct quota_res quota_res = { 0 };
3015 s64 i_sectors_delta = 0;
3017 bch2_fpunch_at(&trans, &iter, inode_inum(inode),
3018 end_sector, &i_sectors_delta);
3019 i_sectors_acct(c, inode, "a_res, i_sectors_delta);
3020 bch2_quota_reservation_put(c, inode, "a_res);
3023 bch2_trans_iter_exit(&trans, &iter);
3024 bch2_trans_exit(&trans);
3028 static long bchfs_fallocate(struct bch_inode_info *inode, int mode,
3029 loff_t offset, loff_t len)
3031 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3032 u64 end = offset + len;
3033 u64 block_start = round_down(offset, block_bytes(c));
3034 u64 block_end = round_up(end, block_bytes(c));
3035 bool truncated_last_page = false;
3038 if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {
3039 ret = inode_newsize_ok(&inode->v, end);
3044 if (mode & FALLOC_FL_ZERO_RANGE) {
3045 ret = bch2_truncate_pages(inode, offset, end);
3046 if (unlikely(ret < 0))
3049 truncated_last_page = ret;
3051 truncate_pagecache_range(&inode->v, offset, end - 1);
3053 block_start = round_up(offset, block_bytes(c));
3054 block_end = round_down(end, block_bytes(c));
3057 ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);
3060 * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,
3061 * so that the VFS cache i_size is consistent with the btree i_size:
3064 !(bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)))
3067 if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)
3068 end = inode->v.i_size;
3070 if (end >= inode->v.i_size &&
3071 (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||
3072 !(mode & FALLOC_FL_KEEP_SIZE))) {
3073 spin_lock(&inode->v.i_lock);
3074 i_size_write(&inode->v, end);
3075 spin_unlock(&inode->v.i_lock);
3077 mutex_lock(&inode->ei_update_lock);
3078 ret2 = bch2_write_inode_size(c, inode, end, 0);
3079 mutex_unlock(&inode->ei_update_lock);
3085 long bch2_fallocate_dispatch(struct file *file, int mode,
3086 loff_t offset, loff_t len)
3088 struct bch_inode_info *inode = file_bch_inode(file);
3089 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3092 if (!percpu_ref_tryget_live(&c->writes))
3095 inode_lock(&inode->v);
3096 inode_dio_wait(&inode->v);
3097 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
3099 ret = file_modified(file);
3103 if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
3104 ret = bchfs_fallocate(inode, mode, offset, len);
3105 else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
3106 ret = bchfs_fpunch(inode, offset, len);
3107 else if (mode == FALLOC_FL_INSERT_RANGE)
3108 ret = bchfs_fcollapse_finsert(inode, offset, len, true);
3109 else if (mode == FALLOC_FL_COLLAPSE_RANGE)
3110 ret = bchfs_fcollapse_finsert(inode, offset, len, false);
3114 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
3115 inode_unlock(&inode->v);
3116 percpu_ref_put(&c->writes);
3118 return bch2_err_class(ret);
3121 static int quota_reserve_range(struct bch_inode_info *inode,
3122 struct quota_res *res,
3125 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3126 struct btree_trans trans;
3127 struct btree_iter iter;
3130 u64 sectors = end - start;
3134 bch2_trans_init(&trans, c, 0, 0);
3136 bch2_trans_begin(&trans);
3138 ret = bch2_subvolume_get_snapshot(&trans, inode->ei_subvol, &snapshot);
3142 bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
3143 SPOS(inode->v.i_ino, pos, snapshot), 0);
3145 while (!(ret = btree_trans_too_many_iters(&trans)) &&
3146 (k = bch2_btree_iter_peek_upto(&iter, POS(inode->v.i_ino, end - 1))).k &&
3147 !(ret = bkey_err(k))) {
3148 if (bkey_extent_is_allocation(k.k)) {
3149 u64 s = min(end, k.k->p.offset) -
3150 max(start, bkey_start_offset(k.k));
3151 BUG_ON(s > sectors);
3154 bch2_btree_iter_advance(&iter);
3156 pos = iter.pos.offset;
3157 bch2_trans_iter_exit(&trans, &iter);
3159 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3162 bch2_trans_exit(&trans);
3167 return bch2_quota_reservation_add(c, inode, res, sectors, true);
3170 loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
3171 struct file *file_dst, loff_t pos_dst,
3172 loff_t len, unsigned remap_flags)
3174 struct bch_inode_info *src = file_bch_inode(file_src);
3175 struct bch_inode_info *dst = file_bch_inode(file_dst);
3176 struct bch_fs *c = src->v.i_sb->s_fs_info;
3177 struct quota_res quota_res = { 0 };
3178 s64 i_sectors_delta = 0;
3182 if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))
3185 if (remap_flags & REMAP_FILE_DEDUP)
3188 if ((pos_src & (block_bytes(c) - 1)) ||
3189 (pos_dst & (block_bytes(c) - 1)))
3193 abs(pos_src - pos_dst) < len)
3196 bch2_lock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
3198 inode_dio_wait(&src->v);
3199 inode_dio_wait(&dst->v);
3201 ret = generic_remap_file_range_prep(file_src, pos_src,
3204 if (ret < 0 || len == 0)
3207 aligned_len = round_up((u64) len, block_bytes(c));
3209 ret = write_invalidate_inode_pages_range(dst->v.i_mapping,
3210 pos_dst, pos_dst + len - 1);
3214 ret = quota_reserve_range(dst, "a_res, pos_dst >> 9,
3215 (pos_dst + aligned_len) >> 9);
3219 file_update_time(file_dst);
3221 mark_pagecache_unallocated(src, pos_src >> 9,
3222 (pos_src + aligned_len) >> 9);
3224 ret = bch2_remap_range(c,
3225 inode_inum(dst), pos_dst >> 9,
3226 inode_inum(src), pos_src >> 9,
3228 pos_dst + len, &i_sectors_delta);
3233 * due to alignment, we might have remapped slightly more than requsted
3235 ret = min((u64) ret << 9, (u64) len);
3237 i_sectors_acct(c, dst, "a_res, i_sectors_delta);
3239 spin_lock(&dst->v.i_lock);
3240 if (pos_dst + ret > dst->v.i_size)
3241 i_size_write(&dst->v, pos_dst + ret);
3242 spin_unlock(&dst->v.i_lock);
3244 if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
3245 IS_SYNC(file_inode(file_dst)))
3246 ret = bch2_flush_inode(c, inode_inum(dst));
3248 bch2_quota_reservation_put(c, dst, "a_res);
3249 bch2_unlock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
3251 return bch2_err_class(ret);
3256 static int page_data_offset(struct page *page, unsigned offset)
3258 struct bch_page_state *s = bch2_page_state(page);
3262 for (i = offset >> 9; i < PAGE_SECTORS; i++)
3263 if (s->s[i].state >= SECTOR_DIRTY)
3269 static loff_t bch2_seek_pagecache_data(struct inode *vinode,
3270 loff_t start_offset,
3273 struct folio_batch fbatch;
3274 pgoff_t start_index = start_offset >> PAGE_SHIFT;
3275 pgoff_t end_index = end_offset >> PAGE_SHIFT;
3276 pgoff_t index = start_index;
3281 folio_batch_init(&fbatch);
3283 while (filemap_get_folios(vinode->i_mapping,
3284 &index, end_index, &fbatch)) {
3285 for (i = 0; i < folio_batch_count(&fbatch); i++) {
3286 struct folio *folio = fbatch.folios[i];
3290 offset = page_data_offset(&folio->page,
3291 folio->index == start_index
3292 ? start_offset & (PAGE_SIZE - 1)
3295 ret = clamp(((loff_t) folio->index << PAGE_SHIFT) +
3297 start_offset, end_offset);
3298 folio_unlock(folio);
3299 folio_batch_release(&fbatch);
3303 folio_unlock(folio);
3305 folio_batch_release(&fbatch);
3312 static loff_t bch2_seek_data(struct file *file, u64 offset)
3314 struct bch_inode_info *inode = file_bch_inode(file);
3315 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3316 struct btree_trans trans;
3317 struct btree_iter iter;
3319 subvol_inum inum = inode_inum(inode);
3320 u64 isize, next_data = MAX_LFS_FILESIZE;
3324 isize = i_size_read(&inode->v);
3325 if (offset >= isize)
3328 bch2_trans_init(&trans, c, 0, 0);
3330 bch2_trans_begin(&trans);
3332 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
3336 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
3337 SPOS(inode->v.i_ino, offset >> 9, snapshot), 0, k, ret) {
3338 if (k.k->p.inode != inode->v.i_ino) {
3340 } else if (bkey_extent_is_data(k.k)) {
3341 next_data = max(offset, bkey_start_offset(k.k) << 9);
3343 } else if (k.k->p.offset >> 9 > isize)
3346 bch2_trans_iter_exit(&trans, &iter);
3348 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3351 bch2_trans_exit(&trans);
3355 if (next_data > offset)
3356 next_data = bch2_seek_pagecache_data(&inode->v,
3359 if (next_data >= isize)
3362 return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
3365 static int __page_hole_offset(struct page *page, unsigned offset)
3367 struct bch_page_state *s = bch2_page_state(page);
3373 for (i = offset >> 9; i < PAGE_SECTORS; i++)
3374 if (s->s[i].state < SECTOR_DIRTY)
3380 static loff_t page_hole_offset(struct address_space *mapping, loff_t offset)
3382 pgoff_t index = offset >> PAGE_SHIFT;
3387 page = find_lock_page(mapping, index);
3391 pg_offset = __page_hole_offset(page, offset & (PAGE_SIZE - 1));
3393 ret = ((loff_t) index << PAGE_SHIFT) + pg_offset;
3400 static loff_t bch2_seek_pagecache_hole(struct inode *vinode,
3401 loff_t start_offset,
3404 struct address_space *mapping = vinode->i_mapping;
3405 loff_t offset = start_offset, hole;
3407 while (offset < end_offset) {
3408 hole = page_hole_offset(mapping, offset);
3409 if (hole >= 0 && hole <= end_offset)
3410 return max(start_offset, hole);
3412 offset += PAGE_SIZE;
3413 offset &= PAGE_MASK;
3419 static loff_t bch2_seek_hole(struct file *file, u64 offset)
3421 struct bch_inode_info *inode = file_bch_inode(file);
3422 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3423 struct btree_trans trans;
3424 struct btree_iter iter;
3426 subvol_inum inum = inode_inum(inode);
3427 u64 isize, next_hole = MAX_LFS_FILESIZE;
3431 isize = i_size_read(&inode->v);
3432 if (offset >= isize)
3435 bch2_trans_init(&trans, c, 0, 0);
3437 bch2_trans_begin(&trans);
3439 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
3443 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
3444 SPOS(inode->v.i_ino, offset >> 9, snapshot),
3445 BTREE_ITER_SLOTS, k, ret) {
3446 if (k.k->p.inode != inode->v.i_ino) {
3447 next_hole = bch2_seek_pagecache_hole(&inode->v,
3448 offset, MAX_LFS_FILESIZE);
3450 } else if (!bkey_extent_is_data(k.k)) {
3451 next_hole = bch2_seek_pagecache_hole(&inode->v,
3452 max(offset, bkey_start_offset(k.k) << 9),
3453 k.k->p.offset << 9);
3455 if (next_hole < k.k->p.offset << 9)
3458 offset = max(offset, bkey_start_offset(k.k) << 9);
3461 bch2_trans_iter_exit(&trans, &iter);
3463 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3466 bch2_trans_exit(&trans);
3470 if (next_hole > isize)
3473 return vfs_setpos(file, next_hole, MAX_LFS_FILESIZE);
3476 loff_t bch2_llseek(struct file *file, loff_t offset, int whence)
3484 ret = generic_file_llseek(file, offset, whence);
3487 ret = bch2_seek_data(file, offset);
3490 ret = bch2_seek_hole(file, offset);
3497 return bch2_err_class(ret);
3500 void bch2_fs_fsio_exit(struct bch_fs *c)
3502 bioset_exit(&c->dio_write_bioset);
3503 bioset_exit(&c->dio_read_bioset);
3504 bioset_exit(&c->writepage_bioset);
3507 int bch2_fs_fsio_init(struct bch_fs *c)
3511 pr_verbose_init(c->opts, "");
3513 if (bioset_init(&c->writepage_bioset,
3514 4, offsetof(struct bch_writepage_io, op.wbio.bio),
3515 BIOSET_NEED_BVECS) ||
3516 bioset_init(&c->dio_read_bioset,
3517 4, offsetof(struct dio_read, rbio.bio),
3518 BIOSET_NEED_BVECS) ||
3519 bioset_init(&c->dio_write_bioset,
3520 4, offsetof(struct dio_write, op.wbio.bio),
3524 pr_verbose_init(c->opts, "ret %i", ret);
3528 #endif /* NO_BCACHEFS_FS */