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;
445 unsigned nr_pages, i, j;
447 nr_pages = pagevec_lookup_range(&pvec, inode->v.i_mapping,
449 for (i = 0; i < nr_pages; i++) {
450 struct page *page = pvec.pages[i];
451 u64 pg_start = page->index << PAGE_SECTORS_SHIFT;
452 u64 pg_end = (page->index + 1) << PAGE_SECTORS_SHIFT;
453 unsigned pg_offset = max(start, pg_start) - pg_start;
454 unsigned pg_len = min(end, pg_end) - pg_offset - pg_start;
455 struct bch_page_state *s;
457 BUG_ON(end <= pg_start);
458 BUG_ON(pg_offset >= PAGE_SECTORS);
459 BUG_ON(pg_offset + pg_len > PAGE_SECTORS);
462 s = bch2_page_state(page);
466 for (j = pg_offset; j < pg_offset + pg_len; j++)
467 s->s[j].nr_replicas = 0;
468 spin_unlock(&s->lock);
473 pagevec_release(&pvec);
474 } while (index <= end_index);
477 static void mark_pagecache_reserved(struct bch_inode_info *inode,
480 struct bch_fs *c = inode->v.i_sb->s_fs_info;
481 pgoff_t index = start >> PAGE_SECTORS_SHIFT;
482 pgoff_t end_index = (end - 1) >> PAGE_SECTORS_SHIFT;
484 s64 i_sectors_delta = 0;
492 unsigned nr_pages, i, j;
494 nr_pages = pagevec_lookup_range(&pvec, inode->v.i_mapping,
496 for (i = 0; i < nr_pages; i++) {
497 struct page *page = pvec.pages[i];
498 u64 pg_start = page->index << PAGE_SECTORS_SHIFT;
499 u64 pg_end = (page->index + 1) << PAGE_SECTORS_SHIFT;
500 unsigned pg_offset = max(start, pg_start) - pg_start;
501 unsigned pg_len = min(end, pg_end) - pg_offset - pg_start;
502 struct bch_page_state *s;
504 BUG_ON(end <= pg_start);
505 BUG_ON(pg_offset >= PAGE_SECTORS);
506 BUG_ON(pg_offset + pg_len > PAGE_SECTORS);
509 s = bch2_page_state(page);
513 for (j = pg_offset; j < pg_offset + pg_len; j++)
514 switch (s->s[j].state) {
515 case SECTOR_UNALLOCATED:
516 s->s[j].state = SECTOR_RESERVED;
519 s->s[j].state = SECTOR_DIRTY_RESERVED;
525 spin_unlock(&s->lock);
530 pagevec_release(&pvec);
531 } while (index <= end_index);
533 i_sectors_acct(c, inode, NULL, i_sectors_delta);
536 static inline unsigned inode_nr_replicas(struct bch_fs *c, struct bch_inode_info *inode)
538 /* XXX: this should not be open coded */
539 return inode->ei_inode.bi_data_replicas
540 ? inode->ei_inode.bi_data_replicas - 1
541 : c->opts.data_replicas;
544 static inline unsigned sectors_to_reserve(struct bch_page_sector *s,
545 unsigned nr_replicas)
547 return max(0, (int) nr_replicas -
549 s->replicas_reserved);
552 static int bch2_get_page_disk_reservation(struct bch_fs *c,
553 struct bch_inode_info *inode,
554 struct page *page, bool check_enospc)
556 struct bch_page_state *s = bch2_page_state_create(page, 0);
557 unsigned nr_replicas = inode_nr_replicas(c, inode);
558 struct disk_reservation disk_res = { 0 };
559 unsigned i, disk_res_sectors = 0;
565 for (i = 0; i < ARRAY_SIZE(s->s); i++)
566 disk_res_sectors += sectors_to_reserve(&s->s[i], nr_replicas);
568 if (!disk_res_sectors)
571 ret = bch2_disk_reservation_get(c, &disk_res,
574 ? BCH_DISK_RESERVATION_NOFAIL
579 for (i = 0; i < ARRAY_SIZE(s->s); i++)
580 s->s[i].replicas_reserved +=
581 sectors_to_reserve(&s->s[i], nr_replicas);
586 struct bch2_page_reservation {
587 struct disk_reservation disk;
588 struct quota_res quota;
591 static void bch2_page_reservation_init(struct bch_fs *c,
592 struct bch_inode_info *inode,
593 struct bch2_page_reservation *res)
595 memset(res, 0, sizeof(*res));
597 res->disk.nr_replicas = inode_nr_replicas(c, inode);
600 static void bch2_page_reservation_put(struct bch_fs *c,
601 struct bch_inode_info *inode,
602 struct bch2_page_reservation *res)
604 bch2_disk_reservation_put(c, &res->disk);
605 bch2_quota_reservation_put(c, inode, &res->quota);
608 static int bch2_page_reservation_get(struct bch_fs *c,
609 struct bch_inode_info *inode, struct page *page,
610 struct bch2_page_reservation *res,
611 unsigned offset, unsigned len, bool check_enospc)
613 struct bch_page_state *s = bch2_page_state_create(page, 0);
614 unsigned i, disk_sectors = 0, quota_sectors = 0;
620 BUG_ON(!s->uptodate);
622 for (i = round_down(offset, block_bytes(c)) >> 9;
623 i < round_up(offset + len, block_bytes(c)) >> 9;
625 disk_sectors += sectors_to_reserve(&s->s[i],
626 res->disk.nr_replicas);
627 quota_sectors += s->s[i].state == SECTOR_UNALLOCATED;
631 ret = bch2_disk_reservation_add(c, &res->disk,
634 ? BCH_DISK_RESERVATION_NOFAIL
641 ret = bch2_quota_reservation_add(c, inode, &res->quota,
645 struct disk_reservation tmp = {
646 .sectors = disk_sectors
649 bch2_disk_reservation_put(c, &tmp);
650 res->disk.sectors -= disk_sectors;
658 static void bch2_clear_page_bits(struct page *page)
660 struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
661 struct bch_fs *c = inode->v.i_sb->s_fs_info;
662 struct bch_page_state *s = bch2_page_state(page);
663 struct disk_reservation disk_res = { 0 };
664 int i, dirty_sectors = 0;
669 EBUG_ON(!PageLocked(page));
670 EBUG_ON(PageWriteback(page));
672 for (i = 0; i < ARRAY_SIZE(s->s); i++) {
673 disk_res.sectors += s->s[i].replicas_reserved;
674 s->s[i].replicas_reserved = 0;
676 switch (s->s[i].state) {
678 s->s[i].state = SECTOR_UNALLOCATED;
681 case SECTOR_DIRTY_RESERVED:
682 s->s[i].state = SECTOR_RESERVED;
689 bch2_disk_reservation_put(c, &disk_res);
691 i_sectors_acct(c, inode, NULL, dirty_sectors);
693 bch2_page_state_release(page);
696 static void bch2_set_page_dirty(struct bch_fs *c,
697 struct bch_inode_info *inode, struct page *page,
698 struct bch2_page_reservation *res,
699 unsigned offset, unsigned len)
701 struct bch_page_state *s = bch2_page_state(page);
702 unsigned i, dirty_sectors = 0;
704 WARN_ON((u64) page_offset(page) + offset + len >
705 round_up((u64) i_size_read(&inode->v), block_bytes(c)));
709 for (i = round_down(offset, block_bytes(c)) >> 9;
710 i < round_up(offset + len, block_bytes(c)) >> 9;
712 unsigned sectors = sectors_to_reserve(&s->s[i],
713 res->disk.nr_replicas);
716 * This can happen if we race with the error path in
717 * bch2_writepage_io_done():
719 sectors = min_t(unsigned, sectors, res->disk.sectors);
721 s->s[i].replicas_reserved += sectors;
722 res->disk.sectors -= sectors;
724 switch (s->s[i].state) {
725 case SECTOR_UNALLOCATED:
726 s->s[i].state = SECTOR_DIRTY;
729 case SECTOR_RESERVED:
730 s->s[i].state = SECTOR_DIRTY_RESERVED;
737 spin_unlock(&s->lock);
739 i_sectors_acct(c, inode, &res->quota, dirty_sectors);
741 if (!PageDirty(page))
742 __set_page_dirty_nobuffers(page);
745 vm_fault_t bch2_page_fault(struct vm_fault *vmf)
747 struct file *file = vmf->vma->vm_file;
748 struct address_space *mapping = file->f_mapping;
749 struct address_space *fdm = faults_disabled_mapping();
750 struct bch_inode_info *inode = file_bch_inode(file);
754 return VM_FAULT_SIGBUS;
758 struct bch_inode_info *fdm_host = to_bch_ei(fdm->host);
760 if (bch2_pagecache_add_tryget(&inode->ei_pagecache_lock))
763 bch2_pagecache_block_put(&fdm_host->ei_pagecache_lock);
765 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
766 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
768 bch2_pagecache_block_get(&fdm_host->ei_pagecache_lock);
770 /* Signal that lock has been dropped: */
771 set_fdm_dropped_locks();
772 return VM_FAULT_SIGBUS;
775 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
777 ret = filemap_fault(vmf);
778 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
783 vm_fault_t bch2_page_mkwrite(struct vm_fault *vmf)
785 struct page *page = vmf->page;
786 struct file *file = vmf->vma->vm_file;
787 struct bch_inode_info *inode = file_bch_inode(file);
788 struct address_space *mapping = file->f_mapping;
789 struct bch_fs *c = inode->v.i_sb->s_fs_info;
790 struct bch2_page_reservation res;
795 bch2_page_reservation_init(c, inode, &res);
797 sb_start_pagefault(inode->v.i_sb);
798 file_update_time(file);
801 * Not strictly necessary, but helps avoid dio writes livelocking in
802 * write_invalidate_inode_pages_range() - can drop this if/when we get
803 * a write_invalidate_inode_pages_range() that works without dropping
804 * page lock before invalidating page
806 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
809 isize = i_size_read(&inode->v);
811 if (page->mapping != mapping || page_offset(page) >= isize) {
813 ret = VM_FAULT_NOPAGE;
817 len = min_t(loff_t, PAGE_SIZE, isize - page_offset(page));
819 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
820 if (bch2_page_state_set(c, inode_inum(inode), &page, 1)) {
822 ret = VM_FAULT_SIGBUS;
827 if (bch2_page_reservation_get(c, inode, page, &res, 0, len, true)) {
829 ret = VM_FAULT_SIGBUS;
833 bch2_set_page_dirty(c, inode, page, &res, 0, len);
834 bch2_page_reservation_put(c, inode, &res);
836 wait_for_stable_page(page);
837 ret = VM_FAULT_LOCKED;
839 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
840 sb_end_pagefault(inode->v.i_sb);
845 void bch2_invalidate_folio(struct folio *folio, size_t offset, size_t length)
847 if (offset || length < folio_size(folio))
850 bch2_clear_page_bits(&folio->page);
853 bool bch2_release_folio(struct folio *folio, gfp_t gfp_mask)
855 if (folio_test_dirty(folio) || folio_test_writeback(folio))
858 bch2_clear_page_bits(&folio->page);
862 #ifdef CONFIG_MIGRATION
863 int bch2_migrate_page(struct address_space *mapping, struct page *newpage,
864 struct page *page, enum migrate_mode mode)
868 EBUG_ON(!PageLocked(page));
869 EBUG_ON(!PageLocked(newpage));
871 ret = migrate_page_move_mapping(mapping, newpage, page, 0);
872 if (ret != MIGRATEPAGE_SUCCESS)
875 if (PagePrivate(page))
876 attach_page_private(newpage, detach_page_private(page));
878 if (mode != MIGRATE_SYNC_NO_COPY)
879 migrate_page_copy(newpage, page);
881 migrate_page_states(newpage, page);
882 return MIGRATEPAGE_SUCCESS;
888 static void bch2_readpages_end_io(struct bio *bio)
890 struct bvec_iter_all iter;
893 bio_for_each_segment_all(bv, bio, iter) {
894 struct page *page = bv->bv_page;
896 if (!bio->bi_status) {
897 SetPageUptodate(page);
899 ClearPageUptodate(page);
908 struct readpages_iter {
909 struct address_space *mapping;
916 static int readpages_iter_init(struct readpages_iter *iter,
917 struct readahead_control *ractl)
919 unsigned i, nr_pages = readahead_count(ractl);
921 memset(iter, 0, sizeof(*iter));
923 iter->mapping = ractl->mapping;
924 iter->offset = readahead_index(ractl);
925 iter->nr_pages = nr_pages;
927 iter->pages = kmalloc_array(nr_pages, sizeof(struct page *), GFP_NOFS);
931 nr_pages = __readahead_batch(ractl, iter->pages, nr_pages);
932 for (i = 0; i < nr_pages; i++) {
933 __bch2_page_state_create(iter->pages[i], __GFP_NOFAIL);
934 put_page(iter->pages[i]);
940 static inline struct page *readpage_iter_next(struct readpages_iter *iter)
942 if (iter->idx >= iter->nr_pages)
945 EBUG_ON(iter->pages[iter->idx]->index != iter->offset + iter->idx);
947 return iter->pages[iter->idx];
950 static bool extent_partial_reads_expensive(struct bkey_s_c k)
952 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
953 struct bch_extent_crc_unpacked crc;
954 const union bch_extent_entry *i;
956 bkey_for_each_crc(k.k, ptrs, crc, i)
957 if (crc.csum_type || crc.compression_type)
962 static void readpage_bio_extend(struct readpages_iter *iter,
964 unsigned sectors_this_extent,
967 while (bio_sectors(bio) < sectors_this_extent &&
968 bio->bi_vcnt < bio->bi_max_vecs) {
969 pgoff_t page_offset = bio_end_sector(bio) >> PAGE_SECTORS_SHIFT;
970 struct page *page = readpage_iter_next(iter);
974 if (iter->offset + iter->idx != page_offset)
982 page = xa_load(&iter->mapping->i_pages, page_offset);
983 if (page && !xa_is_value(page))
986 page = __page_cache_alloc(readahead_gfp_mask(iter->mapping));
990 if (!__bch2_page_state_create(page, 0)) {
995 ret = add_to_page_cache_lru(page, iter->mapping,
996 page_offset, GFP_NOFS);
998 __bch2_page_state_release(page);
1006 BUG_ON(!bio_add_page(bio, page, PAGE_SIZE, 0));
1010 static void bchfs_read(struct btree_trans *trans,
1011 struct bch_read_bio *rbio,
1013 struct readpages_iter *readpages_iter)
1015 struct bch_fs *c = trans->c;
1016 struct btree_iter iter;
1018 int flags = BCH_READ_RETRY_IF_STALE|
1019 BCH_READ_MAY_PROMOTE;
1024 rbio->start_time = local_clock();
1025 rbio->subvol = inum.subvol;
1027 bch2_bkey_buf_init(&sk);
1029 bch2_trans_begin(trans);
1030 iter = (struct btree_iter) { NULL };
1032 ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
1036 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
1037 SPOS(inum.inum, rbio->bio.bi_iter.bi_sector, snapshot),
1041 unsigned bytes, sectors, offset_into_extent;
1042 enum btree_id data_btree = BTREE_ID_extents;
1045 * read_extent -> io_time_reset may cause a transaction restart
1046 * without returning an error, we need to check for that here:
1048 ret = bch2_trans_relock(trans);
1052 bch2_btree_iter_set_pos(&iter,
1053 POS(inum.inum, rbio->bio.bi_iter.bi_sector));
1055 k = bch2_btree_iter_peek_slot(&iter);
1060 offset_into_extent = iter.pos.offset -
1061 bkey_start_offset(k.k);
1062 sectors = k.k->size - offset_into_extent;
1064 bch2_bkey_buf_reassemble(&sk, c, k);
1066 ret = bch2_read_indirect_extent(trans, &data_btree,
1067 &offset_into_extent, &sk);
1071 k = bkey_i_to_s_c(sk.k);
1073 sectors = min(sectors, k.k->size - offset_into_extent);
1076 readpage_bio_extend(readpages_iter, &rbio->bio, sectors,
1077 extent_partial_reads_expensive(k));
1079 bytes = min(sectors, bio_sectors(&rbio->bio)) << 9;
1080 swap(rbio->bio.bi_iter.bi_size, bytes);
1082 if (rbio->bio.bi_iter.bi_size == bytes)
1083 flags |= BCH_READ_LAST_FRAGMENT;
1085 bch2_bio_page_state_set(&rbio->bio, k);
1087 bch2_read_extent(trans, rbio, iter.pos,
1088 data_btree, k, offset_into_extent, flags);
1090 if (flags & BCH_READ_LAST_FRAGMENT)
1093 swap(rbio->bio.bi_iter.bi_size, bytes);
1094 bio_advance(&rbio->bio, bytes);
1096 ret = btree_trans_too_many_iters(trans);
1101 bch2_trans_iter_exit(trans, &iter);
1103 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
1107 bch_err_inum_ratelimited(c, inum.inum,
1108 "read error %i from btree lookup", ret);
1109 rbio->bio.bi_status = BLK_STS_IOERR;
1110 bio_endio(&rbio->bio);
1113 bch2_bkey_buf_exit(&sk, c);
1116 void bch2_readahead(struct readahead_control *ractl)
1118 struct bch_inode_info *inode = to_bch_ei(ractl->mapping->host);
1119 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1120 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1121 struct btree_trans trans;
1123 struct readpages_iter readpages_iter;
1126 ret = readpages_iter_init(&readpages_iter, ractl);
1129 bch2_trans_init(&trans, c, 0, 0);
1131 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1133 while ((page = readpage_iter_next(&readpages_iter))) {
1134 pgoff_t index = readpages_iter.offset + readpages_iter.idx;
1135 unsigned n = min_t(unsigned,
1136 readpages_iter.nr_pages -
1139 struct bch_read_bio *rbio =
1140 rbio_init(bio_alloc_bioset(NULL, n, REQ_OP_READ,
1141 GFP_NOFS, &c->bio_read),
1144 readpages_iter.idx++;
1146 rbio->bio.bi_iter.bi_sector = (sector_t) index << PAGE_SECTORS_SHIFT;
1147 rbio->bio.bi_end_io = bch2_readpages_end_io;
1148 BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
1150 bchfs_read(&trans, rbio, inode_inum(inode),
1154 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1156 bch2_trans_exit(&trans);
1157 kfree(readpages_iter.pages);
1160 static void __bchfs_readpage(struct bch_fs *c, struct bch_read_bio *rbio,
1161 subvol_inum inum, struct page *page)
1163 struct btree_trans trans;
1165 bch2_page_state_create(page, __GFP_NOFAIL);
1167 bio_set_op_attrs(&rbio->bio, REQ_OP_READ, REQ_SYNC);
1168 rbio->bio.bi_iter.bi_sector =
1169 (sector_t) page->index << PAGE_SECTORS_SHIFT;
1170 BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
1172 bch2_trans_init(&trans, c, 0, 0);
1173 bchfs_read(&trans, rbio, inum, NULL);
1174 bch2_trans_exit(&trans);
1177 static void bch2_read_single_page_end_io(struct bio *bio)
1179 complete(bio->bi_private);
1182 static int bch2_read_single_page(struct page *page,
1183 struct address_space *mapping)
1185 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1186 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1187 struct bch_read_bio *rbio;
1189 DECLARE_COMPLETION_ONSTACK(done);
1191 rbio = rbio_init(bio_alloc_bioset(NULL, 1, REQ_OP_READ, GFP_NOFS, &c->bio_read),
1192 io_opts(c, &inode->ei_inode));
1193 rbio->bio.bi_private = &done;
1194 rbio->bio.bi_end_io = bch2_read_single_page_end_io;
1196 __bchfs_readpage(c, rbio, inode_inum(inode), page);
1197 wait_for_completion(&done);
1199 ret = blk_status_to_errno(rbio->bio.bi_status);
1200 bio_put(&rbio->bio);
1205 SetPageUptodate(page);
1209 int bch2_read_folio(struct file *file, struct folio *folio)
1211 struct page *page = &folio->page;
1214 ret = bch2_read_single_page(page, page->mapping);
1215 folio_unlock(folio);
1216 return bch2_err_class(ret);
1221 struct bch_writepage_state {
1222 struct bch_writepage_io *io;
1223 struct bch_io_opts opts;
1226 static inline struct bch_writepage_state bch_writepage_state_init(struct bch_fs *c,
1227 struct bch_inode_info *inode)
1229 return (struct bch_writepage_state) {
1230 .opts = io_opts(c, &inode->ei_inode)
1234 static void bch2_writepage_io_free(struct closure *cl)
1236 struct bch_writepage_io *io = container_of(cl,
1237 struct bch_writepage_io, cl);
1239 bio_put(&io->op.wbio.bio);
1242 static void bch2_writepage_io_done(struct closure *cl)
1244 struct bch_writepage_io *io = container_of(cl,
1245 struct bch_writepage_io, cl);
1246 struct bch_fs *c = io->op.c;
1247 struct bio *bio = &io->op.wbio.bio;
1248 struct bvec_iter_all iter;
1249 struct bio_vec *bvec;
1253 set_bit(EI_INODE_ERROR, &io->inode->ei_flags);
1255 bio_for_each_segment_all(bvec, bio, iter) {
1256 struct bch_page_state *s;
1258 SetPageError(bvec->bv_page);
1259 mapping_set_error(bvec->bv_page->mapping, -EIO);
1261 s = __bch2_page_state(bvec->bv_page);
1262 spin_lock(&s->lock);
1263 for (i = 0; i < PAGE_SECTORS; i++)
1264 s->s[i].nr_replicas = 0;
1265 spin_unlock(&s->lock);
1269 if (io->op.flags & BCH_WRITE_WROTE_DATA_INLINE) {
1270 bio_for_each_segment_all(bvec, bio, iter) {
1271 struct bch_page_state *s;
1273 s = __bch2_page_state(bvec->bv_page);
1274 spin_lock(&s->lock);
1275 for (i = 0; i < PAGE_SECTORS; i++)
1276 s->s[i].nr_replicas = 0;
1277 spin_unlock(&s->lock);
1282 * racing with fallocate can cause us to add fewer sectors than
1283 * expected - but we shouldn't add more sectors than expected:
1285 WARN_ON_ONCE(io->op.i_sectors_delta > 0);
1288 * (error (due to going RO) halfway through a page can screw that up
1291 BUG_ON(io->op.op.i_sectors_delta >= PAGE_SECTORS);
1295 * PageWriteback is effectively our ref on the inode - fixup i_blocks
1296 * before calling end_page_writeback:
1298 i_sectors_acct(c, io->inode, NULL, io->op.i_sectors_delta);
1300 bio_for_each_segment_all(bvec, bio, iter) {
1301 struct bch_page_state *s = __bch2_page_state(bvec->bv_page);
1303 if (atomic_dec_and_test(&s->write_count))
1304 end_page_writeback(bvec->bv_page);
1307 closure_return_with_destructor(&io->cl, bch2_writepage_io_free);
1310 static void bch2_writepage_do_io(struct bch_writepage_state *w)
1312 struct bch_writepage_io *io = w->io;
1315 closure_call(&io->op.cl, bch2_write, NULL, &io->cl);
1316 continue_at(&io->cl, bch2_writepage_io_done, NULL);
1320 * Get a bch_writepage_io and add @page to it - appending to an existing one if
1321 * possible, else allocating a new one:
1323 static void bch2_writepage_io_alloc(struct bch_fs *c,
1324 struct writeback_control *wbc,
1325 struct bch_writepage_state *w,
1326 struct bch_inode_info *inode,
1328 unsigned nr_replicas)
1330 struct bch_write_op *op;
1332 w->io = container_of(bio_alloc_bioset(NULL, BIO_MAX_VECS,
1335 &c->writepage_bioset),
1336 struct bch_writepage_io, op.wbio.bio);
1338 closure_init(&w->io->cl, NULL);
1339 w->io->inode = inode;
1342 bch2_write_op_init(op, c, w->opts);
1343 op->target = w->opts.foreground_target;
1344 op->nr_replicas = nr_replicas;
1345 op->res.nr_replicas = nr_replicas;
1346 op->write_point = writepoint_hashed(inode->ei_last_dirtied);
1347 op->subvol = inode->ei_subvol;
1348 op->pos = POS(inode->v.i_ino, sector);
1349 op->wbio.bio.bi_iter.bi_sector = sector;
1350 op->wbio.bio.bi_opf = wbc_to_write_flags(wbc);
1353 static int __bch2_writepage(struct page *page,
1354 struct writeback_control *wbc,
1357 struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
1358 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1359 struct bch_writepage_state *w = data;
1360 struct bch_page_state *s, orig;
1361 unsigned i, offset, nr_replicas_this_write = U32_MAX;
1362 loff_t i_size = i_size_read(&inode->v);
1363 pgoff_t end_index = i_size >> PAGE_SHIFT;
1366 EBUG_ON(!PageUptodate(page));
1368 /* Is the page fully inside i_size? */
1369 if (page->index < end_index)
1372 /* Is the page fully outside i_size? (truncate in progress) */
1373 offset = i_size & (PAGE_SIZE - 1);
1374 if (page->index > end_index || !offset) {
1380 * The page straddles i_size. It must be zeroed out on each and every
1381 * writepage invocation because it may be mmapped. "A file is mapped
1382 * in multiples of the page size. For a file that is not a multiple of
1383 * the page size, the remaining memory is zeroed when mapped, and
1384 * writes to that region are not written out to the file."
1386 zero_user_segment(page, offset, PAGE_SIZE);
1388 s = bch2_page_state_create(page, __GFP_NOFAIL);
1391 * Things get really hairy with errors during writeback:
1393 ret = bch2_get_page_disk_reservation(c, inode, page, false);
1396 /* Before unlocking the page, get copy of reservations: */
1397 spin_lock(&s->lock);
1399 spin_unlock(&s->lock);
1401 for (i = 0; i < PAGE_SECTORS; i++) {
1402 if (s->s[i].state < SECTOR_DIRTY)
1405 nr_replicas_this_write =
1406 min_t(unsigned, nr_replicas_this_write,
1407 s->s[i].nr_replicas +
1408 s->s[i].replicas_reserved);
1411 for (i = 0; i < PAGE_SECTORS; i++) {
1412 if (s->s[i].state < SECTOR_DIRTY)
1415 s->s[i].nr_replicas = w->opts.compression
1416 ? 0 : nr_replicas_this_write;
1418 s->s[i].replicas_reserved = 0;
1419 s->s[i].state = SECTOR_ALLOCATED;
1422 BUG_ON(atomic_read(&s->write_count));
1423 atomic_set(&s->write_count, 1);
1425 BUG_ON(PageWriteback(page));
1426 set_page_writeback(page);
1432 unsigned sectors = 0, dirty_sectors = 0, reserved_sectors = 0;
1435 while (offset < PAGE_SECTORS &&
1436 orig.s[offset].state < SECTOR_DIRTY)
1439 if (offset == PAGE_SECTORS)
1442 while (offset + sectors < PAGE_SECTORS &&
1443 orig.s[offset + sectors].state >= SECTOR_DIRTY) {
1444 reserved_sectors += orig.s[offset + sectors].replicas_reserved;
1445 dirty_sectors += orig.s[offset + sectors].state == SECTOR_DIRTY;
1450 sector = ((u64) page->index << PAGE_SECTORS_SHIFT) + offset;
1453 (w->io->op.res.nr_replicas != nr_replicas_this_write ||
1454 bio_full(&w->io->op.wbio.bio, PAGE_SIZE) ||
1455 w->io->op.wbio.bio.bi_iter.bi_size + (sectors << 9) >=
1456 (BIO_MAX_VECS * PAGE_SIZE) ||
1457 bio_end_sector(&w->io->op.wbio.bio) != sector))
1458 bch2_writepage_do_io(w);
1461 bch2_writepage_io_alloc(c, wbc, w, inode, sector,
1462 nr_replicas_this_write);
1464 atomic_inc(&s->write_count);
1466 BUG_ON(inode != w->io->inode);
1467 BUG_ON(!bio_add_page(&w->io->op.wbio.bio, page,
1468 sectors << 9, offset << 9));
1470 /* Check for writing past i_size: */
1471 WARN_ON_ONCE((bio_end_sector(&w->io->op.wbio.bio) << 9) >
1472 round_up(i_size, block_bytes(c)));
1474 w->io->op.res.sectors += reserved_sectors;
1475 w->io->op.i_sectors_delta -= dirty_sectors;
1476 w->io->op.new_i_size = i_size;
1481 if (atomic_dec_and_test(&s->write_count))
1482 end_page_writeback(page);
1487 int bch2_writepages(struct address_space *mapping, struct writeback_control *wbc)
1489 struct bch_fs *c = mapping->host->i_sb->s_fs_info;
1490 struct bch_writepage_state w =
1491 bch_writepage_state_init(c, to_bch_ei(mapping->host));
1492 struct blk_plug plug;
1495 blk_start_plug(&plug);
1496 ret = write_cache_pages(mapping, wbc, __bch2_writepage, &w);
1498 bch2_writepage_do_io(&w);
1499 blk_finish_plug(&plug);
1500 return bch2_err_class(ret);
1503 /* buffered writes: */
1505 int bch2_write_begin(struct file *file, struct address_space *mapping,
1506 loff_t pos, unsigned len,
1507 struct page **pagep, void **fsdata)
1509 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1510 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1511 struct bch2_page_reservation *res;
1512 pgoff_t index = pos >> PAGE_SHIFT;
1513 unsigned offset = pos & (PAGE_SIZE - 1);
1517 res = kmalloc(sizeof(*res), GFP_KERNEL);
1521 bch2_page_reservation_init(c, inode, res);
1524 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1526 page = grab_cache_page_write_begin(mapping, index);
1530 if (PageUptodate(page))
1533 /* If we're writing entire page, don't need to read it in first: */
1534 if (len == PAGE_SIZE)
1537 if (!offset && pos + len >= inode->v.i_size) {
1538 zero_user_segment(page, len, PAGE_SIZE);
1539 flush_dcache_page(page);
1543 if (index > inode->v.i_size >> PAGE_SHIFT) {
1544 zero_user_segments(page, 0, offset, offset + len, PAGE_SIZE);
1545 flush_dcache_page(page);
1549 ret = bch2_read_single_page(page, mapping);
1553 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
1554 ret = bch2_page_state_set(c, inode_inum(inode), &page, 1);
1559 ret = bch2_page_reservation_get(c, inode, page, res,
1562 if (!PageUptodate(page)) {
1564 * If the page hasn't been read in, we won't know if we
1565 * actually need a reservation - we don't actually need
1566 * to read here, we just need to check if the page is
1567 * fully backed by uncompressed data:
1582 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1585 return bch2_err_class(ret);
1588 int bch2_write_end(struct file *file, struct address_space *mapping,
1589 loff_t pos, unsigned len, unsigned copied,
1590 struct page *page, void *fsdata)
1592 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1593 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1594 struct bch2_page_reservation *res = fsdata;
1595 unsigned offset = pos & (PAGE_SIZE - 1);
1597 lockdep_assert_held(&inode->v.i_rwsem);
1599 if (unlikely(copied < len && !PageUptodate(page))) {
1601 * The page needs to be read in, but that would destroy
1602 * our partial write - simplest thing is to just force
1603 * userspace to redo the write:
1605 zero_user(page, 0, PAGE_SIZE);
1606 flush_dcache_page(page);
1610 spin_lock(&inode->v.i_lock);
1611 if (pos + copied > inode->v.i_size)
1612 i_size_write(&inode->v, pos + copied);
1613 spin_unlock(&inode->v.i_lock);
1616 if (!PageUptodate(page))
1617 SetPageUptodate(page);
1619 bch2_set_page_dirty(c, inode, page, res, offset, copied);
1621 inode->ei_last_dirtied = (unsigned long) current;
1626 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1628 bch2_page_reservation_put(c, inode, res);
1634 #define WRITE_BATCH_PAGES 32
1636 static int __bch2_buffered_write(struct bch_inode_info *inode,
1637 struct address_space *mapping,
1638 struct iov_iter *iter,
1639 loff_t pos, unsigned len)
1641 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1642 struct page *pages[WRITE_BATCH_PAGES];
1643 struct bch2_page_reservation res;
1644 unsigned long index = pos >> PAGE_SHIFT;
1645 unsigned offset = pos & (PAGE_SIZE - 1);
1646 unsigned nr_pages = DIV_ROUND_UP(offset + len, PAGE_SIZE);
1647 unsigned i, reserved = 0, set_dirty = 0;
1648 unsigned copied = 0, nr_pages_copied = 0;
1652 BUG_ON(nr_pages > ARRAY_SIZE(pages));
1654 bch2_page_reservation_init(c, inode, &res);
1656 for (i = 0; i < nr_pages; i++) {
1657 pages[i] = grab_cache_page_write_begin(mapping, index + i);
1664 len = min_t(unsigned, len,
1665 nr_pages * PAGE_SIZE - offset);
1670 if (offset && !PageUptodate(pages[0])) {
1671 ret = bch2_read_single_page(pages[0], mapping);
1676 if ((pos + len) & (PAGE_SIZE - 1) &&
1677 !PageUptodate(pages[nr_pages - 1])) {
1678 if ((index + nr_pages - 1) << PAGE_SHIFT >= inode->v.i_size) {
1679 zero_user(pages[nr_pages - 1], 0, PAGE_SIZE);
1681 ret = bch2_read_single_page(pages[nr_pages - 1], mapping);
1687 while (reserved < len) {
1688 unsigned i = (offset + reserved) >> PAGE_SHIFT;
1689 struct page *page = pages[i];
1690 unsigned pg_offset = (offset + reserved) & (PAGE_SIZE - 1);
1691 unsigned pg_len = min_t(unsigned, len - reserved,
1692 PAGE_SIZE - pg_offset);
1694 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
1695 ret = bch2_page_state_set(c, inode_inum(inode),
1696 pages + i, nr_pages - i);
1701 ret = bch2_page_reservation_get(c, inode, page, &res,
1702 pg_offset, pg_len, true);
1709 if (mapping_writably_mapped(mapping))
1710 for (i = 0; i < nr_pages; i++)
1711 flush_dcache_page(pages[i]);
1713 while (copied < len) {
1714 struct page *page = pages[(offset + copied) >> PAGE_SHIFT];
1715 unsigned pg_offset = (offset + copied) & (PAGE_SIZE - 1);
1716 unsigned pg_len = min_t(unsigned, len - copied,
1717 PAGE_SIZE - pg_offset);
1718 unsigned pg_copied = copy_page_from_iter_atomic(page,
1719 pg_offset, pg_len,iter);
1724 if (!PageUptodate(page) &&
1725 pg_copied != PAGE_SIZE &&
1726 pos + copied + pg_copied < inode->v.i_size) {
1727 zero_user(page, 0, PAGE_SIZE);
1731 flush_dcache_page(page);
1732 copied += pg_copied;
1734 if (pg_copied != pg_len)
1741 spin_lock(&inode->v.i_lock);
1742 if (pos + copied > inode->v.i_size)
1743 i_size_write(&inode->v, pos + copied);
1744 spin_unlock(&inode->v.i_lock);
1746 while (set_dirty < copied) {
1747 struct page *page = pages[(offset + set_dirty) >> PAGE_SHIFT];
1748 unsigned pg_offset = (offset + set_dirty) & (PAGE_SIZE - 1);
1749 unsigned pg_len = min_t(unsigned, copied - set_dirty,
1750 PAGE_SIZE - pg_offset);
1752 if (!PageUptodate(page))
1753 SetPageUptodate(page);
1755 bch2_set_page_dirty(c, inode, page, &res, pg_offset, pg_len);
1759 set_dirty += pg_len;
1762 nr_pages_copied = DIV_ROUND_UP(offset + copied, PAGE_SIZE);
1763 inode->ei_last_dirtied = (unsigned long) current;
1765 for (i = nr_pages_copied; i < nr_pages; i++) {
1766 unlock_page(pages[i]);
1770 bch2_page_reservation_put(c, inode, &res);
1772 return copied ?: ret;
1775 static ssize_t bch2_buffered_write(struct kiocb *iocb, struct iov_iter *iter)
1777 struct file *file = iocb->ki_filp;
1778 struct address_space *mapping = file->f_mapping;
1779 struct bch_inode_info *inode = file_bch_inode(file);
1780 loff_t pos = iocb->ki_pos;
1781 ssize_t written = 0;
1784 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1787 unsigned offset = pos & (PAGE_SIZE - 1);
1788 unsigned bytes = min_t(unsigned long, iov_iter_count(iter),
1789 PAGE_SIZE * WRITE_BATCH_PAGES - offset);
1792 * Bring in the user page that we will copy from _first_.
1793 * Otherwise there's a nasty deadlock on copying from the
1794 * same page as we're writing to, without it being marked
1797 * Not only is this an optimisation, but it is also required
1798 * to check that the address is actually valid, when atomic
1799 * usercopies are used, below.
1801 if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
1802 bytes = min_t(unsigned long, iov_iter_count(iter),
1803 PAGE_SIZE - offset);
1805 if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
1811 if (unlikely(fatal_signal_pending(current))) {
1816 ret = __bch2_buffered_write(inode, mapping, iter, pos, bytes);
1817 if (unlikely(ret < 0))
1822 if (unlikely(ret == 0)) {
1824 * If we were unable to copy any data at all, we must
1825 * fall back to a single segment length write.
1827 * If we didn't fallback here, we could livelock
1828 * because not all segments in the iov can be copied at
1829 * once without a pagefault.
1831 bytes = min_t(unsigned long, PAGE_SIZE - offset,
1832 iov_iter_single_seg_count(iter));
1839 balance_dirty_pages_ratelimited(mapping);
1840 } while (iov_iter_count(iter));
1842 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1844 return written ? written : ret;
1847 /* O_DIRECT reads */
1849 static void bio_check_or_release(struct bio *bio, bool check_dirty)
1852 bio_check_pages_dirty(bio);
1854 bio_release_pages(bio, false);
1859 static void bch2_dio_read_complete(struct closure *cl)
1861 struct dio_read *dio = container_of(cl, struct dio_read, cl);
1863 dio->req->ki_complete(dio->req, dio->ret);
1864 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
1867 static void bch2_direct_IO_read_endio(struct bio *bio)
1869 struct dio_read *dio = bio->bi_private;
1872 dio->ret = blk_status_to_errno(bio->bi_status);
1874 closure_put(&dio->cl);
1877 static void bch2_direct_IO_read_split_endio(struct bio *bio)
1879 struct dio_read *dio = bio->bi_private;
1880 bool should_dirty = dio->should_dirty;
1882 bch2_direct_IO_read_endio(bio);
1883 bio_check_or_release(bio, should_dirty);
1886 static int bch2_direct_IO_read(struct kiocb *req, struct iov_iter *iter)
1888 struct file *file = req->ki_filp;
1889 struct bch_inode_info *inode = file_bch_inode(file);
1890 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1891 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1892 struct dio_read *dio;
1894 loff_t offset = req->ki_pos;
1895 bool sync = is_sync_kiocb(req);
1899 if ((offset|iter->count) & (block_bytes(c) - 1))
1902 ret = min_t(loff_t, iter->count,
1903 max_t(loff_t, 0, i_size_read(&inode->v) - offset));
1908 shorten = iov_iter_count(iter) - round_up(ret, block_bytes(c));
1909 iter->count -= shorten;
1911 bio = bio_alloc_bioset(NULL,
1912 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
1915 &c->dio_read_bioset);
1917 bio->bi_end_io = bch2_direct_IO_read_endio;
1919 dio = container_of(bio, struct dio_read, rbio.bio);
1920 closure_init(&dio->cl, NULL);
1923 * this is a _really_ horrible hack just to avoid an atomic sub at the
1927 set_closure_fn(&dio->cl, bch2_dio_read_complete, NULL);
1928 atomic_set(&dio->cl.remaining,
1929 CLOSURE_REMAINING_INITIALIZER -
1931 CLOSURE_DESTRUCTOR);
1933 atomic_set(&dio->cl.remaining,
1934 CLOSURE_REMAINING_INITIALIZER + 1);
1940 * This is one of the sketchier things I've encountered: we have to skip
1941 * the dirtying of requests that are internal from the kernel (i.e. from
1942 * loopback), because we'll deadlock on page_lock.
1944 dio->should_dirty = iter_is_iovec(iter);
1947 while (iter->count) {
1948 bio = bio_alloc_bioset(NULL,
1949 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
1953 bio->bi_end_io = bch2_direct_IO_read_split_endio;
1955 bio_set_op_attrs(bio, REQ_OP_READ, REQ_SYNC);
1956 bio->bi_iter.bi_sector = offset >> 9;
1957 bio->bi_private = dio;
1959 ret = bio_iov_iter_get_pages(bio, iter);
1961 /* XXX: fault inject this path */
1962 bio->bi_status = BLK_STS_RESOURCE;
1967 offset += bio->bi_iter.bi_size;
1969 if (dio->should_dirty)
1970 bio_set_pages_dirty(bio);
1973 closure_get(&dio->cl);
1975 bch2_read(c, rbio_init(bio, opts), inode_inum(inode));
1978 iter->count += shorten;
1981 closure_sync(&dio->cl);
1982 closure_debug_destroy(&dio->cl);
1984 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
1987 return -EIOCBQUEUED;
1991 ssize_t bch2_read_iter(struct kiocb *iocb, struct iov_iter *iter)
1993 struct file *file = iocb->ki_filp;
1994 struct bch_inode_info *inode = file_bch_inode(file);
1995 struct address_space *mapping = file->f_mapping;
1996 size_t count = iov_iter_count(iter);
2000 return 0; /* skip atime */
2002 if (iocb->ki_flags & IOCB_DIRECT) {
2003 struct blk_plug plug;
2005 ret = filemap_write_and_wait_range(mapping,
2007 iocb->ki_pos + count - 1);
2011 file_accessed(file);
2013 blk_start_plug(&plug);
2014 ret = bch2_direct_IO_read(iocb, iter);
2015 blk_finish_plug(&plug);
2018 iocb->ki_pos += ret;
2020 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
2021 ret = generic_file_read_iter(iocb, iter);
2022 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
2025 return bch2_err_class(ret);
2028 /* O_DIRECT writes */
2030 static bool bch2_check_range_allocated(struct bch_fs *c, subvol_inum inum,
2031 u64 offset, u64 size,
2032 unsigned nr_replicas, bool compressed)
2034 struct btree_trans trans;
2035 struct btree_iter iter;
2037 u64 end = offset + size;
2042 bch2_trans_init(&trans, c, 0, 0);
2044 bch2_trans_begin(&trans);
2046 err = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
2050 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
2051 SPOS(inum.inum, offset, snapshot),
2052 BTREE_ITER_SLOTS, k, err) {
2053 if (bkey_cmp(bkey_start_pos(k.k), POS(inum.inum, end)) >= 0)
2056 if (k.k->p.snapshot != snapshot ||
2057 nr_replicas > bch2_bkey_replicas(c, k) ||
2058 (!compressed && bch2_bkey_sectors_compressed(k))) {
2064 offset = iter.pos.offset;
2065 bch2_trans_iter_exit(&trans, &iter);
2067 if (bch2_err_matches(err, BCH_ERR_transaction_restart))
2069 bch2_trans_exit(&trans);
2071 return err ? false : ret;
2074 static void bch2_dio_write_loop_async(struct bch_write_op *);
2076 static long bch2_dio_write_loop(struct dio_write *dio)
2078 bool kthread = (current->flags & PF_KTHREAD) != 0;
2079 struct kiocb *req = dio->req;
2080 struct address_space *mapping = req->ki_filp->f_mapping;
2081 struct bch_inode_info *inode = file_bch_inode(req->ki_filp);
2082 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2083 struct bio *bio = &dio->op.wbio.bio;
2084 struct bvec_iter_all iter;
2086 unsigned unaligned, iter_count;
2087 bool sync = dio->sync, dropped_locks;
2094 iter_count = dio->iter.count;
2096 if (kthread && dio->mm)
2097 kthread_use_mm(dio->mm);
2098 BUG_ON(current->faults_disabled_mapping);
2099 current->faults_disabled_mapping = mapping;
2101 ret = bio_iov_iter_get_pages(bio, &dio->iter);
2103 dropped_locks = fdm_dropped_locks();
2105 current->faults_disabled_mapping = NULL;
2106 if (kthread && dio->mm)
2107 kthread_unuse_mm(dio->mm);
2110 * If the fault handler returned an error but also signalled
2111 * that it dropped & retook ei_pagecache_lock, we just need to
2112 * re-shoot down the page cache and retry:
2114 if (dropped_locks && ret)
2117 if (unlikely(ret < 0))
2120 if (unlikely(dropped_locks)) {
2121 ret = write_invalidate_inode_pages_range(mapping,
2123 req->ki_pos + iter_count - 1);
2127 if (!bio->bi_iter.bi_size)
2131 unaligned = bio->bi_iter.bi_size & (block_bytes(c) - 1);
2132 bio->bi_iter.bi_size -= unaligned;
2133 iov_iter_revert(&dio->iter, unaligned);
2135 if (!bio->bi_iter.bi_size) {
2137 * bio_iov_iter_get_pages was only able to get <
2138 * blocksize worth of pages:
2144 bch2_write_op_init(&dio->op, c, io_opts(c, &inode->ei_inode));
2145 dio->op.end_io = bch2_dio_write_loop_async;
2146 dio->op.target = dio->op.opts.foreground_target;
2147 dio->op.write_point = writepoint_hashed((unsigned long) current);
2148 dio->op.nr_replicas = dio->op.opts.data_replicas;
2149 dio->op.subvol = inode->ei_subvol;
2150 dio->op.pos = POS(inode->v.i_ino, (u64) req->ki_pos >> 9);
2152 if ((req->ki_flags & IOCB_DSYNC) &&
2153 !c->opts.journal_flush_disabled)
2154 dio->op.flags |= BCH_WRITE_FLUSH;
2155 dio->op.flags |= BCH_WRITE_CHECK_ENOSPC;
2157 ret = bch2_disk_reservation_get(c, &dio->op.res, bio_sectors(bio),
2158 dio->op.opts.data_replicas, 0);
2159 if (unlikely(ret) &&
2160 !bch2_check_range_allocated(c, inode_inum(inode),
2161 dio->op.pos.offset, bio_sectors(bio),
2162 dio->op.opts.data_replicas,
2163 dio->op.opts.compression != 0))
2166 task_io_account_write(bio->bi_iter.bi_size);
2168 if (!dio->sync && !dio->loop && dio->iter.count) {
2169 struct iovec *iov = dio->inline_vecs;
2171 if (dio->iter.nr_segs > ARRAY_SIZE(dio->inline_vecs)) {
2172 iov = kmalloc(dio->iter.nr_segs * sizeof(*iov),
2174 if (unlikely(!iov)) {
2175 dio->sync = sync = true;
2179 dio->free_iov = true;
2182 memcpy(iov, dio->iter.iov, dio->iter.nr_segs * sizeof(*iov));
2183 dio->iter.iov = iov;
2187 closure_call(&dio->op.cl, bch2_write, NULL, NULL);
2190 wait_for_completion(&dio->done);
2192 return -EIOCBQUEUED;
2194 i_sectors_acct(c, inode, &dio->quota_res,
2195 dio->op.i_sectors_delta);
2196 req->ki_pos += (u64) dio->op.written << 9;
2197 dio->written += dio->op.written;
2199 spin_lock(&inode->v.i_lock);
2200 if (req->ki_pos > inode->v.i_size)
2201 i_size_write(&inode->v, req->ki_pos);
2202 spin_unlock(&inode->v.i_lock);
2204 if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
2205 bio_for_each_segment_all(bv, bio, iter)
2206 put_page(bv->bv_page);
2209 if (dio->op.error) {
2210 set_bit(EI_INODE_ERROR, &inode->ei_flags);
2214 if (!dio->iter.count)
2217 bio_reset(bio, NULL, REQ_OP_WRITE);
2218 reinit_completion(&dio->done);
2221 ret = dio->op.error ?: ((long) dio->written << 9);
2223 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2224 bch2_quota_reservation_put(c, inode, &dio->quota_res);
2227 kfree(dio->iter.iov);
2229 if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
2230 bio_for_each_segment_all(bv, bio, iter)
2231 put_page(bv->bv_page);
2234 /* inode->i_dio_count is our ref on inode and thus bch_fs */
2235 inode_dio_end(&inode->v);
2238 req->ki_complete(req, ret);
2244 static void bch2_dio_write_loop_async(struct bch_write_op *op)
2246 struct dio_write *dio = container_of(op, struct dio_write, op);
2249 complete(&dio->done);
2251 bch2_dio_write_loop(dio);
2255 ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
2257 struct file *file = req->ki_filp;
2258 struct address_space *mapping = file->f_mapping;
2259 struct bch_inode_info *inode = file_bch_inode(file);
2260 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2261 struct dio_write *dio;
2263 bool locked = true, extending;
2267 prefetch((void *) &c->opts + 64);
2268 prefetch(&inode->ei_inode);
2269 prefetch((void *) &inode->ei_inode + 64);
2271 inode_lock(&inode->v);
2273 ret = generic_write_checks(req, iter);
2274 if (unlikely(ret <= 0))
2277 ret = file_remove_privs(file);
2281 ret = file_update_time(file);
2285 if (unlikely((req->ki_pos|iter->count) & (block_bytes(c) - 1)))
2288 inode_dio_begin(&inode->v);
2289 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
2291 extending = req->ki_pos + iter->count > inode->v.i_size;
2293 inode_unlock(&inode->v);
2297 bio = bio_alloc_bioset(NULL,
2298 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
2301 &c->dio_write_bioset);
2302 dio = container_of(bio, struct dio_write, op.wbio.bio);
2303 init_completion(&dio->done);
2305 dio->mm = current->mm;
2307 dio->sync = is_sync_kiocb(req) || extending;
2308 dio->free_iov = false;
2309 dio->quota_res.sectors = 0;
2313 ret = bch2_quota_reservation_add(c, inode, &dio->quota_res,
2314 iter->count >> 9, true);
2318 ret = write_invalidate_inode_pages_range(mapping,
2320 req->ki_pos + iter->count - 1);
2324 ret = bch2_dio_write_loop(dio);
2327 inode_unlock(&inode->v);
2330 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2331 bch2_quota_reservation_put(c, inode, &dio->quota_res);
2333 inode_dio_end(&inode->v);
2337 ssize_t bch2_write_iter(struct kiocb *iocb, struct iov_iter *from)
2339 struct file *file = iocb->ki_filp;
2340 struct bch_inode_info *inode = file_bch_inode(file);
2343 if (iocb->ki_flags & IOCB_DIRECT) {
2344 ret = bch2_direct_write(iocb, from);
2348 /* We can write back this queue in page reclaim */
2349 current->backing_dev_info = inode_to_bdi(&inode->v);
2350 inode_lock(&inode->v);
2352 ret = generic_write_checks(iocb, from);
2356 ret = file_remove_privs(file);
2360 ret = file_update_time(file);
2364 ret = bch2_buffered_write(iocb, from);
2365 if (likely(ret > 0))
2366 iocb->ki_pos += ret;
2368 inode_unlock(&inode->v);
2369 current->backing_dev_info = NULL;
2372 ret = generic_write_sync(iocb, ret);
2374 return bch2_err_class(ret);
2380 * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an
2381 * insert trigger: look up the btree inode instead
2383 static int bch2_flush_inode(struct bch_fs *c, subvol_inum inum)
2385 struct bch_inode_unpacked inode;
2388 if (c->opts.journal_flush_disabled)
2391 ret = bch2_inode_find_by_inum(c, inum, &inode);
2395 return bch2_journal_flush_seq(&c->journal, inode.bi_journal_seq);
2398 int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2400 struct bch_inode_info *inode = file_bch_inode(file);
2401 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2402 int ret, ret2, ret3;
2404 ret = file_write_and_wait_range(file, start, end);
2405 ret2 = sync_inode_metadata(&inode->v, 1);
2406 ret3 = bch2_flush_inode(c, inode_inum(inode));
2408 return bch2_err_class(ret ?: ret2 ?: ret3);
2413 static inline int range_has_data(struct bch_fs *c, u32 subvol,
2417 struct btree_trans trans;
2418 struct btree_iter iter;
2422 bch2_trans_init(&trans, c, 0, 0);
2424 bch2_trans_begin(&trans);
2426 ret = bch2_subvolume_get_snapshot(&trans, subvol, &start.snapshot);
2430 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents, start, 0, k, ret) {
2431 if (bkey_cmp(bkey_start_pos(k.k), end) >= 0)
2434 if (bkey_extent_is_data(k.k)) {
2440 bch2_trans_iter_exit(&trans, &iter);
2442 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
2445 bch2_trans_exit(&trans);
2449 static int __bch2_truncate_page(struct bch_inode_info *inode,
2450 pgoff_t index, loff_t start, loff_t end)
2452 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2453 struct address_space *mapping = inode->v.i_mapping;
2454 struct bch_page_state *s;
2455 unsigned start_offset = start & (PAGE_SIZE - 1);
2456 unsigned end_offset = ((end - 1) & (PAGE_SIZE - 1)) + 1;
2459 s64 i_sectors_delta = 0;
2462 /* Page boundary? Nothing to do */
2463 if (!((index == start >> PAGE_SHIFT && start_offset) ||
2464 (index == end >> PAGE_SHIFT && end_offset != PAGE_SIZE)))
2468 if (index << PAGE_SHIFT >= inode->v.i_size)
2471 page = find_lock_page(mapping, index);
2474 * XXX: we're doing two index lookups when we end up reading the
2477 ret = range_has_data(c, inode->ei_subvol,
2478 POS(inode->v.i_ino, index << PAGE_SECTORS_SHIFT),
2479 POS(inode->v.i_ino, (index + 1) << PAGE_SECTORS_SHIFT));
2483 page = find_or_create_page(mapping, index, GFP_KERNEL);
2484 if (unlikely(!page)) {
2490 s = bch2_page_state_create(page, 0);
2496 if (!PageUptodate(page)) {
2497 ret = bch2_read_single_page(page, mapping);
2502 if (index != start >> PAGE_SHIFT)
2504 if (index != end >> PAGE_SHIFT)
2505 end_offset = PAGE_SIZE;
2507 for (i = round_up(start_offset, block_bytes(c)) >> 9;
2508 i < round_down(end_offset, block_bytes(c)) >> 9;
2510 s->s[i].nr_replicas = 0;
2511 if (s->s[i].state == SECTOR_DIRTY)
2513 s->s[i].state = SECTOR_UNALLOCATED;
2516 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2519 * Caller needs to know whether this page will be written out by
2520 * writeback - doing an i_size update if necessary - or whether it will
2521 * be responsible for the i_size update:
2523 ret = s->s[(min_t(u64, inode->v.i_size - (index << PAGE_SHIFT),
2524 PAGE_SIZE) - 1) >> 9].state >= SECTOR_DIRTY;
2526 zero_user_segment(page, start_offset, end_offset);
2529 * Bit of a hack - we don't want truncate to fail due to -ENOSPC.
2531 * XXX: because we aren't currently tracking whether the page has actual
2532 * data in it (vs. just 0s, or only partially written) this wrong. ick.
2534 BUG_ON(bch2_get_page_disk_reservation(c, inode, page, false));
2537 * This removes any writeable userspace mappings; we need to force
2538 * .page_mkwrite to be called again before any mmapped writes, to
2539 * redirty the full page:
2542 __set_page_dirty_nobuffers(page);
2550 static int bch2_truncate_page(struct bch_inode_info *inode, loff_t from)
2552 return __bch2_truncate_page(inode, from >> PAGE_SHIFT,
2553 from, round_up(from, PAGE_SIZE));
2556 static int bch2_truncate_pages(struct bch_inode_info *inode,
2557 loff_t start, loff_t end)
2559 int ret = __bch2_truncate_page(inode, start >> PAGE_SHIFT,
2563 start >> PAGE_SHIFT != end >> PAGE_SHIFT)
2564 ret = __bch2_truncate_page(inode,
2570 static int bch2_extend(struct user_namespace *mnt_userns,
2571 struct bch_inode_info *inode,
2572 struct bch_inode_unpacked *inode_u,
2573 struct iattr *iattr)
2575 struct address_space *mapping = inode->v.i_mapping;
2581 * this has to be done _before_ extending i_size:
2583 ret = filemap_write_and_wait_range(mapping, inode_u->bi_size, S64_MAX);
2587 truncate_setsize(&inode->v, iattr->ia_size);
2589 return bch2_setattr_nonsize(mnt_userns, inode, iattr);
2592 static int bch2_truncate_finish_fn(struct bch_inode_info *inode,
2593 struct bch_inode_unpacked *bi,
2596 bi->bi_flags &= ~BCH_INODE_I_SIZE_DIRTY;
2600 static int bch2_truncate_start_fn(struct bch_inode_info *inode,
2601 struct bch_inode_unpacked *bi, void *p)
2603 u64 *new_i_size = p;
2605 bi->bi_flags |= BCH_INODE_I_SIZE_DIRTY;
2606 bi->bi_size = *new_i_size;
2610 int bch2_truncate(struct user_namespace *mnt_userns,
2611 struct bch_inode_info *inode, struct iattr *iattr)
2613 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2614 struct address_space *mapping = inode->v.i_mapping;
2615 struct bch_inode_unpacked inode_u;
2616 u64 new_i_size = iattr->ia_size;
2617 s64 i_sectors_delta = 0;
2621 * If the truncate call with change the size of the file, the
2622 * cmtimes should be updated. If the size will not change, we
2623 * do not need to update the cmtimes.
2625 if (iattr->ia_size != inode->v.i_size) {
2626 if (!(iattr->ia_valid & ATTR_MTIME))
2627 ktime_get_coarse_real_ts64(&iattr->ia_mtime);
2628 if (!(iattr->ia_valid & ATTR_CTIME))
2629 ktime_get_coarse_real_ts64(&iattr->ia_ctime);
2630 iattr->ia_valid |= ATTR_MTIME|ATTR_CTIME;
2633 inode_dio_wait(&inode->v);
2634 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
2636 ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);
2641 * check this before next assertion; on filesystem error our normal
2642 * invariants are a bit broken (truncate has to truncate the page cache
2643 * before the inode).
2645 ret = bch2_journal_error(&c->journal);
2649 WARN_ON(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
2650 inode->v.i_size < inode_u.bi_size);
2652 if (iattr->ia_size > inode->v.i_size) {
2653 ret = bch2_extend(mnt_userns, inode, &inode_u, iattr);
2657 iattr->ia_valid &= ~ATTR_SIZE;
2659 ret = bch2_truncate_page(inode, iattr->ia_size);
2660 if (unlikely(ret < 0))
2664 * When extending, we're going to write the new i_size to disk
2665 * immediately so we need to flush anything above the current on disk
2668 * Also, when extending we need to flush the page that i_size currently
2669 * straddles - if it's mapped to userspace, we need to ensure that
2670 * userspace has to redirty it and call .mkwrite -> set_page_dirty
2671 * again to allocate the part of the page that was extended.
2673 if (iattr->ia_size > inode_u.bi_size)
2674 ret = filemap_write_and_wait_range(mapping,
2676 iattr->ia_size - 1);
2677 else if (iattr->ia_size & (PAGE_SIZE - 1))
2678 ret = filemap_write_and_wait_range(mapping,
2679 round_down(iattr->ia_size, PAGE_SIZE),
2680 iattr->ia_size - 1);
2684 mutex_lock(&inode->ei_update_lock);
2685 ret = bch2_write_inode(c, inode, bch2_truncate_start_fn,
2687 mutex_unlock(&inode->ei_update_lock);
2692 truncate_setsize(&inode->v, iattr->ia_size);
2694 ret = bch2_fpunch(c, inode_inum(inode),
2695 round_up(iattr->ia_size, block_bytes(c)) >> 9,
2696 U64_MAX, &i_sectors_delta);
2697 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2699 bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&
2700 !bch2_journal_error(&c->journal), c,
2701 "inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",
2702 inode->v.i_ino, (u64) inode->v.i_blocks,
2703 inode->ei_inode.bi_sectors);
2707 mutex_lock(&inode->ei_update_lock);
2708 ret = bch2_write_inode(c, inode, bch2_truncate_finish_fn, NULL, 0);
2709 mutex_unlock(&inode->ei_update_lock);
2711 ret = bch2_setattr_nonsize(mnt_userns, inode, iattr);
2713 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2714 return bch2_err_class(ret);
2719 static int inode_update_times_fn(struct bch_inode_info *inode,
2720 struct bch_inode_unpacked *bi, void *p)
2722 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2724 bi->bi_mtime = bi->bi_ctime = bch2_current_time(c);
2728 static long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)
2730 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2731 u64 end = offset + len;
2732 u64 block_start = round_up(offset, block_bytes(c));
2733 u64 block_end = round_down(end, block_bytes(c));
2734 bool truncated_last_page;
2737 ret = bch2_truncate_pages(inode, offset, end);
2738 if (unlikely(ret < 0))
2741 truncated_last_page = ret;
2743 truncate_pagecache_range(&inode->v, offset, end - 1);
2745 if (block_start < block_end ) {
2746 s64 i_sectors_delta = 0;
2748 ret = bch2_fpunch(c, inode_inum(inode),
2749 block_start >> 9, block_end >> 9,
2751 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2754 mutex_lock(&inode->ei_update_lock);
2755 if (end >= inode->v.i_size && !truncated_last_page) {
2756 ret = bch2_write_inode_size(c, inode, inode->v.i_size,
2757 ATTR_MTIME|ATTR_CTIME);
2759 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
2760 ATTR_MTIME|ATTR_CTIME);
2762 mutex_unlock(&inode->ei_update_lock);
2767 static long bchfs_fcollapse_finsert(struct bch_inode_info *inode,
2768 loff_t offset, loff_t len,
2771 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2772 struct address_space *mapping = inode->v.i_mapping;
2773 struct bkey_buf copy;
2774 struct btree_trans trans;
2775 struct btree_iter src, dst, del;
2776 loff_t shift, new_size;
2780 if ((offset | len) & (block_bytes(c) - 1))
2784 if (inode->v.i_sb->s_maxbytes - inode->v.i_size < len)
2787 if (offset >= inode->v.i_size)
2790 src_start = U64_MAX;
2793 if (offset + len >= inode->v.i_size)
2796 src_start = offset + len;
2800 new_size = inode->v.i_size + shift;
2802 ret = write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
2807 i_size_write(&inode->v, new_size);
2808 mutex_lock(&inode->ei_update_lock);
2809 ret = bch2_write_inode_size(c, inode, new_size,
2810 ATTR_MTIME|ATTR_CTIME);
2811 mutex_unlock(&inode->ei_update_lock);
2813 s64 i_sectors_delta = 0;
2815 ret = bch2_fpunch(c, inode_inum(inode),
2816 offset >> 9, (offset + len) >> 9,
2818 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2824 bch2_bkey_buf_init(©);
2825 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 1024);
2826 bch2_trans_iter_init(&trans, &src, BTREE_ID_extents,
2827 POS(inode->v.i_ino, src_start >> 9),
2829 bch2_trans_copy_iter(&dst, &src);
2830 bch2_trans_copy_iter(&del, &src);
2833 bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
2834 struct disk_reservation disk_res =
2835 bch2_disk_reservation_init(c, 0);
2836 struct bkey_i delete;
2838 struct bpos next_pos;
2839 struct bpos move_pos = POS(inode->v.i_ino, offset >> 9);
2840 struct bpos atomic_end;
2841 unsigned trigger_flags = 0;
2844 bch2_trans_begin(&trans);
2846 ret = bch2_subvolume_get_snapshot(&trans,
2847 inode->ei_subvol, &snapshot);
2851 bch2_btree_iter_set_snapshot(&src, snapshot);
2852 bch2_btree_iter_set_snapshot(&dst, snapshot);
2853 bch2_btree_iter_set_snapshot(&del, snapshot);
2855 bch2_trans_begin(&trans);
2858 ? bch2_btree_iter_peek_prev(&src)
2859 : bch2_btree_iter_peek(&src);
2860 if ((ret = bkey_err(k)))
2863 if (!k.k || k.k->p.inode != inode->v.i_ino)
2867 bkey_cmp(k.k->p, POS(inode->v.i_ino, offset >> 9)) <= 0)
2870 bch2_bkey_buf_reassemble(©, c, k);
2873 bkey_cmp(bkey_start_pos(k.k), move_pos) < 0)
2874 bch2_cut_front(move_pos, copy.k);
2876 copy.k->k.p.offset += shift >> 9;
2877 bch2_btree_iter_set_pos(&dst, bkey_start_pos(©.k->k));
2879 ret = bch2_extent_atomic_end(&trans, &dst, copy.k, &atomic_end);
2883 if (bkey_cmp(atomic_end, copy.k->k.p)) {
2885 move_pos = atomic_end;
2886 move_pos.offset -= shift >> 9;
2889 bch2_cut_back(atomic_end, copy.k);
2893 bkey_init(&delete.k);
2894 delete.k.p = copy.k->k.p;
2895 delete.k.size = copy.k->k.size;
2896 delete.k.p.offset -= shift >> 9;
2897 bch2_btree_iter_set_pos(&del, bkey_start_pos(&delete.k));
2899 next_pos = insert ? bkey_start_pos(&delete.k) : delete.k.p;
2901 if (copy.k->k.size != k.k->size) {
2902 /* We might end up splitting compressed extents: */
2904 bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy.k));
2906 ret = bch2_disk_reservation_get(c, &disk_res,
2907 copy.k->k.size, nr_ptrs,
2908 BCH_DISK_RESERVATION_NOFAIL);
2912 ret = bch2_btree_iter_traverse(&del) ?:
2913 bch2_trans_update(&trans, &del, &delete, trigger_flags) ?:
2914 bch2_trans_update(&trans, &dst, copy.k, trigger_flags) ?:
2915 bch2_trans_commit(&trans, &disk_res, NULL,
2916 BTREE_INSERT_NOFAIL);
2917 bch2_disk_reservation_put(c, &disk_res);
2920 bch2_btree_iter_set_pos(&src, next_pos);
2922 bch2_trans_iter_exit(&trans, &del);
2923 bch2_trans_iter_exit(&trans, &dst);
2924 bch2_trans_iter_exit(&trans, &src);
2925 bch2_trans_exit(&trans);
2926 bch2_bkey_buf_exit(©, c);
2931 mutex_lock(&inode->ei_update_lock);
2933 i_size_write(&inode->v, new_size);
2934 ret = bch2_write_inode_size(c, inode, new_size,
2935 ATTR_MTIME|ATTR_CTIME);
2937 /* We need an inode update to update bi_journal_seq for fsync: */
2938 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
2939 ATTR_MTIME|ATTR_CTIME);
2941 mutex_unlock(&inode->ei_update_lock);
2945 static int __bchfs_fallocate(struct bch_inode_info *inode, int mode,
2946 u64 start_sector, u64 end_sector)
2948 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2949 struct btree_trans trans;
2950 struct btree_iter iter;
2951 struct bpos end_pos = POS(inode->v.i_ino, end_sector);
2952 unsigned replicas = io_opts(c, &inode->ei_inode).data_replicas;
2955 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 512);
2957 bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
2958 POS(inode->v.i_ino, start_sector),
2959 BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
2961 while (!ret && bkey_cmp(iter.pos, end_pos) < 0) {
2962 s64 i_sectors_delta = 0;
2963 struct disk_reservation disk_res = { 0 };
2964 struct quota_res quota_res = { 0 };
2965 struct bkey_i_reservation reservation;
2970 bch2_trans_begin(&trans);
2972 ret = bch2_subvolume_get_snapshot(&trans,
2973 inode->ei_subvol, &snapshot);
2977 bch2_btree_iter_set_snapshot(&iter, snapshot);
2979 k = bch2_btree_iter_peek_slot(&iter);
2980 if ((ret = bkey_err(k)))
2983 /* already reserved */
2984 if (k.k->type == KEY_TYPE_reservation &&
2985 bkey_s_c_to_reservation(k).v->nr_replicas >= replicas) {
2986 bch2_btree_iter_advance(&iter);
2990 if (bkey_extent_is_data(k.k) &&
2991 !(mode & FALLOC_FL_ZERO_RANGE)) {
2992 bch2_btree_iter_advance(&iter);
2996 bkey_reservation_init(&reservation.k_i);
2997 reservation.k.type = KEY_TYPE_reservation;
2998 reservation.k.p = k.k->p;
2999 reservation.k.size = k.k->size;
3001 bch2_cut_front(iter.pos, &reservation.k_i);
3002 bch2_cut_back(end_pos, &reservation.k_i);
3004 sectors = reservation.k.size;
3005 reservation.v.nr_replicas = bch2_bkey_nr_ptrs_allocated(k);
3007 if (!bkey_extent_is_allocation(k.k)) {
3008 ret = bch2_quota_reservation_add(c, inode,
3015 if (reservation.v.nr_replicas < replicas ||
3016 bch2_bkey_sectors_compressed(k)) {
3017 ret = bch2_disk_reservation_get(c, &disk_res, sectors,
3022 reservation.v.nr_replicas = disk_res.nr_replicas;
3025 ret = bch2_extent_update(&trans, inode_inum(inode), &iter,
3028 0, &i_sectors_delta, true);
3031 i_sectors_acct(c, inode, "a_res, i_sectors_delta);
3033 bch2_quota_reservation_put(c, inode, "a_res);
3034 bch2_disk_reservation_put(c, &disk_res);
3035 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3039 bch2_trans_unlock(&trans); /* lock ordering, before taking pagecache locks: */
3040 mark_pagecache_reserved(inode, start_sector, iter.pos.offset);
3042 if (bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)) {
3043 struct quota_res quota_res = { 0 };
3044 s64 i_sectors_delta = 0;
3046 bch2_fpunch_at(&trans, &iter, inode_inum(inode),
3047 end_sector, &i_sectors_delta);
3048 i_sectors_acct(c, inode, "a_res, i_sectors_delta);
3049 bch2_quota_reservation_put(c, inode, "a_res);
3052 bch2_trans_iter_exit(&trans, &iter);
3053 bch2_trans_exit(&trans);
3057 static long bchfs_fallocate(struct bch_inode_info *inode, int mode,
3058 loff_t offset, loff_t len)
3060 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3061 u64 end = offset + len;
3062 u64 block_start = round_down(offset, block_bytes(c));
3063 u64 block_end = round_up(end, block_bytes(c));
3064 bool truncated_last_page = false;
3067 if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {
3068 ret = inode_newsize_ok(&inode->v, end);
3073 if (mode & FALLOC_FL_ZERO_RANGE) {
3074 ret = bch2_truncate_pages(inode, offset, end);
3075 if (unlikely(ret < 0))
3078 truncated_last_page = ret;
3080 truncate_pagecache_range(&inode->v, offset, end - 1);
3082 block_start = round_up(offset, block_bytes(c));
3083 block_end = round_down(end, block_bytes(c));
3086 ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);
3089 * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,
3090 * so that the VFS cache i_size is consistent with the btree i_size:
3093 !(bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)))
3096 if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)
3097 end = inode->v.i_size;
3099 if (end >= inode->v.i_size &&
3100 (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||
3101 !(mode & FALLOC_FL_KEEP_SIZE))) {
3102 spin_lock(&inode->v.i_lock);
3103 i_size_write(&inode->v, end);
3104 spin_unlock(&inode->v.i_lock);
3106 mutex_lock(&inode->ei_update_lock);
3107 ret2 = bch2_write_inode_size(c, inode, end, 0);
3108 mutex_unlock(&inode->ei_update_lock);
3114 long bch2_fallocate_dispatch(struct file *file, int mode,
3115 loff_t offset, loff_t len)
3117 struct bch_inode_info *inode = file_bch_inode(file);
3118 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3121 if (!percpu_ref_tryget_live(&c->writes))
3124 inode_lock(&inode->v);
3125 inode_dio_wait(&inode->v);
3126 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
3128 if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
3129 ret = bchfs_fallocate(inode, mode, offset, len);
3130 else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
3131 ret = bchfs_fpunch(inode, offset, len);
3132 else if (mode == FALLOC_FL_INSERT_RANGE)
3133 ret = bchfs_fcollapse_finsert(inode, offset, len, true);
3134 else if (mode == FALLOC_FL_COLLAPSE_RANGE)
3135 ret = bchfs_fcollapse_finsert(inode, offset, len, false);
3140 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
3141 inode_unlock(&inode->v);
3142 percpu_ref_put(&c->writes);
3144 return bch2_err_class(ret);
3147 loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
3148 struct file *file_dst, loff_t pos_dst,
3149 loff_t len, unsigned remap_flags)
3151 struct bch_inode_info *src = file_bch_inode(file_src);
3152 struct bch_inode_info *dst = file_bch_inode(file_dst);
3153 struct bch_fs *c = src->v.i_sb->s_fs_info;
3154 s64 i_sectors_delta = 0;
3158 if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))
3161 if (remap_flags & REMAP_FILE_DEDUP)
3164 if ((pos_src & (block_bytes(c) - 1)) ||
3165 (pos_dst & (block_bytes(c) - 1)))
3169 abs(pos_src - pos_dst) < len)
3172 bch2_lock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
3174 file_update_time(file_dst);
3176 inode_dio_wait(&src->v);
3177 inode_dio_wait(&dst->v);
3179 ret = generic_remap_file_range_prep(file_src, pos_src,
3182 if (ret < 0 || len == 0)
3185 aligned_len = round_up((u64) len, block_bytes(c));
3187 ret = write_invalidate_inode_pages_range(dst->v.i_mapping,
3188 pos_dst, pos_dst + len - 1);
3192 mark_pagecache_unallocated(src, pos_src >> 9,
3193 (pos_src + aligned_len) >> 9);
3195 ret = bch2_remap_range(c,
3196 inode_inum(dst), pos_dst >> 9,
3197 inode_inum(src), pos_src >> 9,
3199 pos_dst + len, &i_sectors_delta);
3204 * due to alignment, we might have remapped slightly more than requsted
3206 ret = min((u64) ret << 9, (u64) len);
3208 /* XXX get a quota reservation */
3209 i_sectors_acct(c, dst, NULL, i_sectors_delta);
3211 spin_lock(&dst->v.i_lock);
3212 if (pos_dst + ret > dst->v.i_size)
3213 i_size_write(&dst->v, pos_dst + ret);
3214 spin_unlock(&dst->v.i_lock);
3216 if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
3217 IS_SYNC(file_inode(file_dst)))
3218 ret = bch2_flush_inode(c, inode_inum(dst));
3220 bch2_unlock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
3222 return bch2_err_class(ret);
3227 static int page_data_offset(struct page *page, unsigned offset)
3229 struct bch_page_state *s = bch2_page_state(page);
3233 for (i = offset >> 9; i < PAGE_SECTORS; i++)
3234 if (s->s[i].state >= SECTOR_DIRTY)
3240 static loff_t bch2_seek_pagecache_data(struct inode *vinode,
3241 loff_t start_offset,
3244 struct address_space *mapping = vinode->i_mapping;
3246 pgoff_t start_index = start_offset >> PAGE_SHIFT;
3247 pgoff_t end_index = end_offset >> PAGE_SHIFT;
3248 pgoff_t index = start_index;
3252 while (index <= end_index) {
3253 if (find_get_pages_range(mapping, &index, end_index, 1, &page)) {
3256 offset = page_data_offset(page,
3257 page->index == start_index
3258 ? start_offset & (PAGE_SIZE - 1)
3261 ret = clamp(((loff_t) page->index << PAGE_SHIFT) +
3263 start_offset, end_offset);
3279 static loff_t bch2_seek_data(struct file *file, u64 offset)
3281 struct bch_inode_info *inode = file_bch_inode(file);
3282 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3283 struct btree_trans trans;
3284 struct btree_iter iter;
3286 subvol_inum inum = inode_inum(inode);
3287 u64 isize, next_data = MAX_LFS_FILESIZE;
3291 isize = i_size_read(&inode->v);
3292 if (offset >= isize)
3295 bch2_trans_init(&trans, c, 0, 0);
3297 bch2_trans_begin(&trans);
3299 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
3303 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
3304 SPOS(inode->v.i_ino, offset >> 9, snapshot), 0, k, ret) {
3305 if (k.k->p.inode != inode->v.i_ino) {
3307 } else if (bkey_extent_is_data(k.k)) {
3308 next_data = max(offset, bkey_start_offset(k.k) << 9);
3310 } else if (k.k->p.offset >> 9 > isize)
3313 bch2_trans_iter_exit(&trans, &iter);
3315 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3318 bch2_trans_exit(&trans);
3322 if (next_data > offset)
3323 next_data = bch2_seek_pagecache_data(&inode->v,
3326 if (next_data >= isize)
3329 return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
3332 static int __page_hole_offset(struct page *page, unsigned offset)
3334 struct bch_page_state *s = bch2_page_state(page);
3340 for (i = offset >> 9; i < PAGE_SECTORS; i++)
3341 if (s->s[i].state < SECTOR_DIRTY)
3347 static loff_t page_hole_offset(struct address_space *mapping, loff_t offset)
3349 pgoff_t index = offset >> PAGE_SHIFT;
3354 page = find_lock_page(mapping, index);
3358 pg_offset = __page_hole_offset(page, offset & (PAGE_SIZE - 1));
3360 ret = ((loff_t) index << PAGE_SHIFT) + pg_offset;
3367 static loff_t bch2_seek_pagecache_hole(struct inode *vinode,
3368 loff_t start_offset,
3371 struct address_space *mapping = vinode->i_mapping;
3372 loff_t offset = start_offset, hole;
3374 while (offset < end_offset) {
3375 hole = page_hole_offset(mapping, offset);
3376 if (hole >= 0 && hole <= end_offset)
3377 return max(start_offset, hole);
3379 offset += PAGE_SIZE;
3380 offset &= PAGE_MASK;
3386 static loff_t bch2_seek_hole(struct file *file, u64 offset)
3388 struct bch_inode_info *inode = file_bch_inode(file);
3389 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3390 struct btree_trans trans;
3391 struct btree_iter iter;
3393 subvol_inum inum = inode_inum(inode);
3394 u64 isize, next_hole = MAX_LFS_FILESIZE;
3398 isize = i_size_read(&inode->v);
3399 if (offset >= isize)
3402 bch2_trans_init(&trans, c, 0, 0);
3404 bch2_trans_begin(&trans);
3406 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
3410 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
3411 SPOS(inode->v.i_ino, offset >> 9, snapshot),
3412 BTREE_ITER_SLOTS, k, ret) {
3413 if (k.k->p.inode != inode->v.i_ino) {
3414 next_hole = bch2_seek_pagecache_hole(&inode->v,
3415 offset, MAX_LFS_FILESIZE);
3417 } else if (!bkey_extent_is_data(k.k)) {
3418 next_hole = bch2_seek_pagecache_hole(&inode->v,
3419 max(offset, bkey_start_offset(k.k) << 9),
3420 k.k->p.offset << 9);
3422 if (next_hole < k.k->p.offset << 9)
3425 offset = max(offset, bkey_start_offset(k.k) << 9);
3428 bch2_trans_iter_exit(&trans, &iter);
3430 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
3433 bch2_trans_exit(&trans);
3437 if (next_hole > isize)
3440 return vfs_setpos(file, next_hole, MAX_LFS_FILESIZE);
3443 loff_t bch2_llseek(struct file *file, loff_t offset, int whence)
3451 ret = generic_file_llseek(file, offset, whence);
3454 ret = bch2_seek_data(file, offset);
3457 ret = bch2_seek_hole(file, offset);
3464 return bch2_err_class(ret);
3467 void bch2_fs_fsio_exit(struct bch_fs *c)
3469 bioset_exit(&c->dio_write_bioset);
3470 bioset_exit(&c->dio_read_bioset);
3471 bioset_exit(&c->writepage_bioset);
3474 int bch2_fs_fsio_init(struct bch_fs *c)
3478 pr_verbose_init(c->opts, "");
3480 if (bioset_init(&c->writepage_bioset,
3481 4, offsetof(struct bch_writepage_io, op.wbio.bio),
3482 BIOSET_NEED_BVECS) ||
3483 bioset_init(&c->dio_read_bioset,
3484 4, offsetof(struct dio_read, rbio.bio),
3485 BIOSET_NEED_BVECS) ||
3486 bioset_init(&c->dio_write_bioset,
3487 4, offsetof(struct dio_write, op.wbio.bio),
3491 pr_verbose_init(c->opts, "ret %i", ret);
3495 #endif /* NO_BCACHEFS_FS */