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);
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 int bch2_releasepage(struct page *page, gfp_t gfp_mask)
858 bch2_clear_page_bits(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 if (!bch2_trans_relock(trans)) {
1053 bch2_btree_iter_set_pos(&iter,
1054 POS(inum.inum, rbio->bio.bi_iter.bi_sector));
1056 k = bch2_btree_iter_peek_slot(&iter);
1061 offset_into_extent = iter.pos.offset -
1062 bkey_start_offset(k.k);
1063 sectors = k.k->size - offset_into_extent;
1065 bch2_bkey_buf_reassemble(&sk, c, k);
1067 ret = bch2_read_indirect_extent(trans, &data_btree,
1068 &offset_into_extent, &sk);
1072 k = bkey_i_to_s_c(sk.k);
1074 sectors = min(sectors, k.k->size - offset_into_extent);
1077 readpage_bio_extend(readpages_iter, &rbio->bio, sectors,
1078 extent_partial_reads_expensive(k));
1080 bytes = min(sectors, bio_sectors(&rbio->bio)) << 9;
1081 swap(rbio->bio.bi_iter.bi_size, bytes);
1083 if (rbio->bio.bi_iter.bi_size == bytes)
1084 flags |= BCH_READ_LAST_FRAGMENT;
1086 bch2_bio_page_state_set(&rbio->bio, k);
1088 bch2_read_extent(trans, rbio, iter.pos,
1089 data_btree, k, offset_into_extent, flags);
1091 if (flags & BCH_READ_LAST_FRAGMENT)
1094 swap(rbio->bio.bi_iter.bi_size, bytes);
1095 bio_advance(&rbio->bio, bytes);
1097 ret = btree_trans_too_many_iters(trans);
1102 bch2_trans_iter_exit(trans, &iter);
1108 bch_err_inum_ratelimited(c, inum.inum,
1109 "read error %i from btree lookup", ret);
1110 rbio->bio.bi_status = BLK_STS_IOERR;
1111 bio_endio(&rbio->bio);
1114 bch2_bkey_buf_exit(&sk, c);
1117 void bch2_readahead(struct readahead_control *ractl)
1119 struct bch_inode_info *inode = to_bch_ei(ractl->mapping->host);
1120 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1121 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1122 struct btree_trans trans;
1124 struct readpages_iter readpages_iter;
1127 ret = readpages_iter_init(&readpages_iter, ractl);
1130 bch2_trans_init(&trans, c, 0, 0);
1132 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1134 while ((page = readpage_iter_next(&readpages_iter))) {
1135 pgoff_t index = readpages_iter.offset + readpages_iter.idx;
1136 unsigned n = min_t(unsigned,
1137 readpages_iter.nr_pages -
1140 struct bch_read_bio *rbio =
1141 rbio_init(bio_alloc_bioset(NULL, n, REQ_OP_READ,
1142 GFP_NOFS, &c->bio_read),
1145 readpages_iter.idx++;
1147 rbio->bio.bi_iter.bi_sector = (sector_t) index << PAGE_SECTORS_SHIFT;
1148 rbio->bio.bi_end_io = bch2_readpages_end_io;
1149 BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
1151 bchfs_read(&trans, rbio, inode_inum(inode),
1155 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1157 bch2_trans_exit(&trans);
1158 kfree(readpages_iter.pages);
1161 static void __bchfs_readpage(struct bch_fs *c, struct bch_read_bio *rbio,
1162 subvol_inum inum, struct page *page)
1164 struct btree_trans trans;
1166 bch2_page_state_create(page, __GFP_NOFAIL);
1168 bio_set_op_attrs(&rbio->bio, REQ_OP_READ, REQ_SYNC);
1169 rbio->bio.bi_iter.bi_sector =
1170 (sector_t) page->index << PAGE_SECTORS_SHIFT;
1171 BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
1173 bch2_trans_init(&trans, c, 0, 0);
1174 bchfs_read(&trans, rbio, inum, NULL);
1175 bch2_trans_exit(&trans);
1178 int bch2_readpage(struct file *file, struct page *page)
1180 struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
1181 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1182 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1183 struct bch_read_bio *rbio;
1185 rbio = rbio_init(bio_alloc_bioset(NULL, 1, REQ_OP_READ, GFP_NOFS, &c->bio_read), opts);
1186 rbio->bio.bi_end_io = bch2_readpages_end_io;
1188 __bchfs_readpage(c, rbio, inode_inum(inode), page);
1192 static void bch2_read_single_page_end_io(struct bio *bio)
1194 complete(bio->bi_private);
1197 static int bch2_read_single_page(struct page *page,
1198 struct address_space *mapping)
1200 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1201 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1202 struct bch_read_bio *rbio;
1204 DECLARE_COMPLETION_ONSTACK(done);
1206 rbio = rbio_init(bio_alloc_bioset(NULL, 1, REQ_OP_READ, GFP_NOFS, &c->bio_read),
1207 io_opts(c, &inode->ei_inode));
1208 rbio->bio.bi_private = &done;
1209 rbio->bio.bi_end_io = bch2_read_single_page_end_io;
1211 __bchfs_readpage(c, rbio, inode_inum(inode), page);
1212 wait_for_completion(&done);
1214 ret = blk_status_to_errno(rbio->bio.bi_status);
1215 bio_put(&rbio->bio);
1220 SetPageUptodate(page);
1226 struct bch_writepage_state {
1227 struct bch_writepage_io *io;
1228 struct bch_io_opts opts;
1231 static inline struct bch_writepage_state bch_writepage_state_init(struct bch_fs *c,
1232 struct bch_inode_info *inode)
1234 return (struct bch_writepage_state) {
1235 .opts = io_opts(c, &inode->ei_inode)
1239 static void bch2_writepage_io_free(struct closure *cl)
1241 struct bch_writepage_io *io = container_of(cl,
1242 struct bch_writepage_io, cl);
1244 bio_put(&io->op.wbio.bio);
1247 static void bch2_writepage_io_done(struct closure *cl)
1249 struct bch_writepage_io *io = container_of(cl,
1250 struct bch_writepage_io, cl);
1251 struct bch_fs *c = io->op.c;
1252 struct bio *bio = &io->op.wbio.bio;
1253 struct bvec_iter_all iter;
1254 struct bio_vec *bvec;
1257 up(&io->op.c->io_in_flight);
1260 set_bit(EI_INODE_ERROR, &io->inode->ei_flags);
1262 bio_for_each_segment_all(bvec, bio, iter) {
1263 struct bch_page_state *s;
1265 SetPageError(bvec->bv_page);
1266 mapping_set_error(bvec->bv_page->mapping, -EIO);
1268 s = __bch2_page_state(bvec->bv_page);
1269 spin_lock(&s->lock);
1270 for (i = 0; i < PAGE_SECTORS; i++)
1271 s->s[i].nr_replicas = 0;
1272 spin_unlock(&s->lock);
1276 if (io->op.flags & BCH_WRITE_WROTE_DATA_INLINE) {
1277 bio_for_each_segment_all(bvec, bio, iter) {
1278 struct bch_page_state *s;
1280 s = __bch2_page_state(bvec->bv_page);
1281 spin_lock(&s->lock);
1282 for (i = 0; i < PAGE_SECTORS; i++)
1283 s->s[i].nr_replicas = 0;
1284 spin_unlock(&s->lock);
1289 * racing with fallocate can cause us to add fewer sectors than
1290 * expected - but we shouldn't add more sectors than expected:
1292 WARN_ON_ONCE(io->op.i_sectors_delta > 0);
1295 * (error (due to going RO) halfway through a page can screw that up
1298 BUG_ON(io->op.op.i_sectors_delta >= PAGE_SECTORS);
1302 * PageWriteback is effectively our ref on the inode - fixup i_blocks
1303 * before calling end_page_writeback:
1305 i_sectors_acct(c, io->inode, NULL, io->op.i_sectors_delta);
1307 bio_for_each_segment_all(bvec, bio, iter) {
1308 struct bch_page_state *s = __bch2_page_state(bvec->bv_page);
1310 if (atomic_dec_and_test(&s->write_count))
1311 end_page_writeback(bvec->bv_page);
1314 closure_return_with_destructor(&io->cl, bch2_writepage_io_free);
1317 static void bch2_writepage_do_io(struct bch_writepage_state *w)
1319 struct bch_writepage_io *io = w->io;
1321 down(&io->op.c->io_in_flight);
1324 closure_call(&io->op.cl, bch2_write, NULL, &io->cl);
1325 continue_at(&io->cl, bch2_writepage_io_done, NULL);
1329 * Get a bch_writepage_io and add @page to it - appending to an existing one if
1330 * possible, else allocating a new one:
1332 static void bch2_writepage_io_alloc(struct bch_fs *c,
1333 struct writeback_control *wbc,
1334 struct bch_writepage_state *w,
1335 struct bch_inode_info *inode,
1337 unsigned nr_replicas)
1339 struct bch_write_op *op;
1341 w->io = container_of(bio_alloc_bioset(NULL, BIO_MAX_VECS,
1344 &c->writepage_bioset),
1345 struct bch_writepage_io, op.wbio.bio);
1347 closure_init(&w->io->cl, NULL);
1348 w->io->inode = inode;
1351 bch2_write_op_init(op, c, w->opts);
1352 op->target = w->opts.foreground_target;
1353 op->nr_replicas = nr_replicas;
1354 op->res.nr_replicas = nr_replicas;
1355 op->write_point = writepoint_hashed(inode->ei_last_dirtied);
1356 op->subvol = inode->ei_subvol;
1357 op->pos = POS(inode->v.i_ino, sector);
1358 op->wbio.bio.bi_iter.bi_sector = sector;
1359 op->wbio.bio.bi_opf = wbc_to_write_flags(wbc);
1362 static int __bch2_writepage(struct page *page,
1363 struct writeback_control *wbc,
1366 struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
1367 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1368 struct bch_writepage_state *w = data;
1369 struct bch_page_state *s, orig;
1370 unsigned i, offset, nr_replicas_this_write = U32_MAX;
1371 loff_t i_size = i_size_read(&inode->v);
1372 pgoff_t end_index = i_size >> PAGE_SHIFT;
1375 EBUG_ON(!PageUptodate(page));
1377 /* Is the page fully inside i_size? */
1378 if (page->index < end_index)
1381 /* Is the page fully outside i_size? (truncate in progress) */
1382 offset = i_size & (PAGE_SIZE - 1);
1383 if (page->index > end_index || !offset) {
1389 * The page straddles i_size. It must be zeroed out on each and every
1390 * writepage invocation because it may be mmapped. "A file is mapped
1391 * in multiples of the page size. For a file that is not a multiple of
1392 * the page size, the remaining memory is zeroed when mapped, and
1393 * writes to that region are not written out to the file."
1395 zero_user_segment(page, offset, PAGE_SIZE);
1397 s = bch2_page_state_create(page, __GFP_NOFAIL);
1400 * Things get really hairy with errors during writeback:
1402 ret = bch2_get_page_disk_reservation(c, inode, page, false);
1405 /* Before unlocking the page, get copy of reservations: */
1406 spin_lock(&s->lock);
1408 spin_unlock(&s->lock);
1410 for (i = 0; i < PAGE_SECTORS; i++) {
1411 if (s->s[i].state < SECTOR_DIRTY)
1414 nr_replicas_this_write =
1415 min_t(unsigned, nr_replicas_this_write,
1416 s->s[i].nr_replicas +
1417 s->s[i].replicas_reserved);
1420 for (i = 0; i < PAGE_SECTORS; i++) {
1421 if (s->s[i].state < SECTOR_DIRTY)
1424 s->s[i].nr_replicas = w->opts.compression
1425 ? 0 : nr_replicas_this_write;
1427 s->s[i].replicas_reserved = 0;
1428 s->s[i].state = SECTOR_ALLOCATED;
1431 BUG_ON(atomic_read(&s->write_count));
1432 atomic_set(&s->write_count, 1);
1434 BUG_ON(PageWriteback(page));
1435 set_page_writeback(page);
1441 unsigned sectors = 0, dirty_sectors = 0, reserved_sectors = 0;
1444 while (offset < PAGE_SECTORS &&
1445 orig.s[offset].state < SECTOR_DIRTY)
1448 if (offset == PAGE_SECTORS)
1451 while (offset + sectors < PAGE_SECTORS &&
1452 orig.s[offset + sectors].state >= SECTOR_DIRTY) {
1453 reserved_sectors += orig.s[offset + sectors].replicas_reserved;
1454 dirty_sectors += orig.s[offset + sectors].state == SECTOR_DIRTY;
1459 sector = ((u64) page->index << PAGE_SECTORS_SHIFT) + offset;
1462 (w->io->op.res.nr_replicas != nr_replicas_this_write ||
1463 bio_full(&w->io->op.wbio.bio, PAGE_SIZE) ||
1464 w->io->op.wbio.bio.bi_iter.bi_size + (sectors << 9) >=
1465 (BIO_MAX_VECS * PAGE_SIZE) ||
1466 bio_end_sector(&w->io->op.wbio.bio) != sector))
1467 bch2_writepage_do_io(w);
1470 bch2_writepage_io_alloc(c, wbc, w, inode, sector,
1471 nr_replicas_this_write);
1473 atomic_inc(&s->write_count);
1475 BUG_ON(inode != w->io->inode);
1476 BUG_ON(!bio_add_page(&w->io->op.wbio.bio, page,
1477 sectors << 9, offset << 9));
1479 /* Check for writing past i_size: */
1480 WARN_ON_ONCE((bio_end_sector(&w->io->op.wbio.bio) << 9) >
1481 round_up(i_size, block_bytes(c)));
1483 w->io->op.res.sectors += reserved_sectors;
1484 w->io->op.i_sectors_delta -= dirty_sectors;
1485 w->io->op.new_i_size = i_size;
1490 if (atomic_dec_and_test(&s->write_count))
1491 end_page_writeback(page);
1496 int bch2_writepages(struct address_space *mapping, struct writeback_control *wbc)
1498 struct bch_fs *c = mapping->host->i_sb->s_fs_info;
1499 struct bch_writepage_state w =
1500 bch_writepage_state_init(c, to_bch_ei(mapping->host));
1501 struct blk_plug plug;
1504 blk_start_plug(&plug);
1505 ret = write_cache_pages(mapping, wbc, __bch2_writepage, &w);
1507 bch2_writepage_do_io(&w);
1508 blk_finish_plug(&plug);
1512 /* buffered writes: */
1514 int bch2_write_begin(struct file *file, struct address_space *mapping,
1515 loff_t pos, unsigned len, unsigned flags,
1516 struct page **pagep, void **fsdata)
1518 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1519 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1520 struct bch2_page_reservation *res;
1521 pgoff_t index = pos >> PAGE_SHIFT;
1522 unsigned offset = pos & (PAGE_SIZE - 1);
1526 res = kmalloc(sizeof(*res), GFP_KERNEL);
1530 bch2_page_reservation_init(c, inode, res);
1533 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1535 page = grab_cache_page_write_begin(mapping, index, flags);
1539 if (PageUptodate(page))
1542 /* If we're writing entire page, don't need to read it in first: */
1543 if (len == PAGE_SIZE)
1546 if (!offset && pos + len >= inode->v.i_size) {
1547 zero_user_segment(page, len, PAGE_SIZE);
1548 flush_dcache_page(page);
1552 if (index > inode->v.i_size >> PAGE_SHIFT) {
1553 zero_user_segments(page, 0, offset, offset + len, PAGE_SIZE);
1554 flush_dcache_page(page);
1558 ret = bch2_read_single_page(page, mapping);
1562 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
1563 ret = bch2_page_state_set(c, inode_inum(inode), &page, 1);
1568 ret = bch2_page_reservation_get(c, inode, page, res,
1571 if (!PageUptodate(page)) {
1573 * If the page hasn't been read in, we won't know if we
1574 * actually need a reservation - we don't actually need
1575 * to read here, we just need to check if the page is
1576 * fully backed by uncompressed data:
1591 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1597 int bch2_write_end(struct file *file, struct address_space *mapping,
1598 loff_t pos, unsigned len, unsigned copied,
1599 struct page *page, void *fsdata)
1601 struct bch_inode_info *inode = to_bch_ei(mapping->host);
1602 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1603 struct bch2_page_reservation *res = fsdata;
1604 unsigned offset = pos & (PAGE_SIZE - 1);
1606 lockdep_assert_held(&inode->v.i_rwsem);
1608 if (unlikely(copied < len && !PageUptodate(page))) {
1610 * The page needs to be read in, but that would destroy
1611 * our partial write - simplest thing is to just force
1612 * userspace to redo the write:
1614 zero_user(page, 0, PAGE_SIZE);
1615 flush_dcache_page(page);
1619 spin_lock(&inode->v.i_lock);
1620 if (pos + copied > inode->v.i_size)
1621 i_size_write(&inode->v, pos + copied);
1622 spin_unlock(&inode->v.i_lock);
1625 if (!PageUptodate(page))
1626 SetPageUptodate(page);
1628 bch2_set_page_dirty(c, inode, page, res, offset, copied);
1630 inode->ei_last_dirtied = (unsigned long) current;
1635 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1637 bch2_page_reservation_put(c, inode, res);
1643 #define WRITE_BATCH_PAGES 32
1645 static int __bch2_buffered_write(struct bch_inode_info *inode,
1646 struct address_space *mapping,
1647 struct iov_iter *iter,
1648 loff_t pos, unsigned len)
1650 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1651 struct page *pages[WRITE_BATCH_PAGES];
1652 struct bch2_page_reservation res;
1653 unsigned long index = pos >> PAGE_SHIFT;
1654 unsigned offset = pos & (PAGE_SIZE - 1);
1655 unsigned nr_pages = DIV_ROUND_UP(offset + len, PAGE_SIZE);
1656 unsigned i, reserved = 0, set_dirty = 0;
1657 unsigned copied = 0, nr_pages_copied = 0;
1661 BUG_ON(nr_pages > ARRAY_SIZE(pages));
1663 bch2_page_reservation_init(c, inode, &res);
1665 for (i = 0; i < nr_pages; i++) {
1666 pages[i] = grab_cache_page_write_begin(mapping, index + i, 0);
1673 len = min_t(unsigned, len,
1674 nr_pages * PAGE_SIZE - offset);
1679 if (offset && !PageUptodate(pages[0])) {
1680 ret = bch2_read_single_page(pages[0], mapping);
1685 if ((pos + len) & (PAGE_SIZE - 1) &&
1686 !PageUptodate(pages[nr_pages - 1])) {
1687 if ((index + nr_pages - 1) << PAGE_SHIFT >= inode->v.i_size) {
1688 zero_user(pages[nr_pages - 1], 0, PAGE_SIZE);
1690 ret = bch2_read_single_page(pages[nr_pages - 1], mapping);
1696 while (reserved < len) {
1697 unsigned i = (offset + reserved) >> PAGE_SHIFT;
1698 struct page *page = pages[i];
1699 unsigned pg_offset = (offset + reserved) & (PAGE_SIZE - 1);
1700 unsigned pg_len = min_t(unsigned, len - reserved,
1701 PAGE_SIZE - pg_offset);
1703 if (!bch2_page_state_create(page, __GFP_NOFAIL)->uptodate) {
1704 ret = bch2_page_state_set(c, inode_inum(inode),
1705 pages + i, nr_pages - i);
1710 ret = bch2_page_reservation_get(c, inode, page, &res,
1711 pg_offset, pg_len, true);
1718 if (mapping_writably_mapped(mapping))
1719 for (i = 0; i < nr_pages; i++)
1720 flush_dcache_page(pages[i]);
1722 while (copied < len) {
1723 struct page *page = pages[(offset + copied) >> PAGE_SHIFT];
1724 unsigned pg_offset = (offset + copied) & (PAGE_SIZE - 1);
1725 unsigned pg_len = min_t(unsigned, len - copied,
1726 PAGE_SIZE - pg_offset);
1727 unsigned pg_copied = copy_page_from_iter_atomic(page,
1728 pg_offset, pg_len,iter);
1733 if (!PageUptodate(page) &&
1734 pg_copied != PAGE_SIZE &&
1735 pos + copied + pg_copied < inode->v.i_size) {
1736 zero_user(page, 0, PAGE_SIZE);
1740 flush_dcache_page(page);
1741 copied += pg_copied;
1743 if (pg_copied != pg_len)
1750 spin_lock(&inode->v.i_lock);
1751 if (pos + copied > inode->v.i_size)
1752 i_size_write(&inode->v, pos + copied);
1753 spin_unlock(&inode->v.i_lock);
1755 while (set_dirty < copied) {
1756 struct page *page = pages[(offset + set_dirty) >> PAGE_SHIFT];
1757 unsigned pg_offset = (offset + set_dirty) & (PAGE_SIZE - 1);
1758 unsigned pg_len = min_t(unsigned, copied - set_dirty,
1759 PAGE_SIZE - pg_offset);
1761 if (!PageUptodate(page))
1762 SetPageUptodate(page);
1764 bch2_set_page_dirty(c, inode, page, &res, pg_offset, pg_len);
1768 set_dirty += pg_len;
1771 nr_pages_copied = DIV_ROUND_UP(offset + copied, PAGE_SIZE);
1772 inode->ei_last_dirtied = (unsigned long) current;
1774 for (i = nr_pages_copied; i < nr_pages; i++) {
1775 unlock_page(pages[i]);
1779 bch2_page_reservation_put(c, inode, &res);
1781 return copied ?: ret;
1784 static ssize_t bch2_buffered_write(struct kiocb *iocb, struct iov_iter *iter)
1786 struct file *file = iocb->ki_filp;
1787 struct address_space *mapping = file->f_mapping;
1788 struct bch_inode_info *inode = file_bch_inode(file);
1789 loff_t pos = iocb->ki_pos;
1790 ssize_t written = 0;
1793 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
1796 unsigned offset = pos & (PAGE_SIZE - 1);
1797 unsigned bytes = min_t(unsigned long, iov_iter_count(iter),
1798 PAGE_SIZE * WRITE_BATCH_PAGES - offset);
1801 * Bring in the user page that we will copy from _first_.
1802 * Otherwise there's a nasty deadlock on copying from the
1803 * same page as we're writing to, without it being marked
1806 * Not only is this an optimisation, but it is also required
1807 * to check that the address is actually valid, when atomic
1808 * usercopies are used, below.
1810 if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
1811 bytes = min_t(unsigned long, iov_iter_count(iter),
1812 PAGE_SIZE - offset);
1814 if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
1820 if (unlikely(fatal_signal_pending(current))) {
1825 ret = __bch2_buffered_write(inode, mapping, iter, pos, bytes);
1826 if (unlikely(ret < 0))
1831 if (unlikely(ret == 0)) {
1833 * If we were unable to copy any data at all, we must
1834 * fall back to a single segment length write.
1836 * If we didn't fallback here, we could livelock
1837 * because not all segments in the iov can be copied at
1838 * once without a pagefault.
1840 bytes = min_t(unsigned long, PAGE_SIZE - offset,
1841 iov_iter_single_seg_count(iter));
1848 balance_dirty_pages_ratelimited(mapping);
1849 } while (iov_iter_count(iter));
1851 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
1853 return written ? written : ret;
1856 /* O_DIRECT reads */
1858 static void bio_check_or_release(struct bio *bio, bool check_dirty)
1861 bio_check_pages_dirty(bio);
1863 bio_release_pages(bio, false);
1868 static void bch2_dio_read_complete(struct closure *cl)
1870 struct dio_read *dio = container_of(cl, struct dio_read, cl);
1872 dio->req->ki_complete(dio->req, dio->ret);
1873 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
1876 static void bch2_direct_IO_read_endio(struct bio *bio)
1878 struct dio_read *dio = bio->bi_private;
1881 dio->ret = blk_status_to_errno(bio->bi_status);
1883 closure_put(&dio->cl);
1886 static void bch2_direct_IO_read_split_endio(struct bio *bio)
1888 struct dio_read *dio = bio->bi_private;
1889 bool should_dirty = dio->should_dirty;
1891 bch2_direct_IO_read_endio(bio);
1892 bio_check_or_release(bio, should_dirty);
1895 static int bch2_direct_IO_read(struct kiocb *req, struct iov_iter *iter)
1897 struct file *file = req->ki_filp;
1898 struct bch_inode_info *inode = file_bch_inode(file);
1899 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1900 struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
1901 struct dio_read *dio;
1903 loff_t offset = req->ki_pos;
1904 bool sync = is_sync_kiocb(req);
1908 if ((offset|iter->count) & (block_bytes(c) - 1))
1911 ret = min_t(loff_t, iter->count,
1912 max_t(loff_t, 0, i_size_read(&inode->v) - offset));
1917 shorten = iov_iter_count(iter) - round_up(ret, block_bytes(c));
1918 iter->count -= shorten;
1920 bio = bio_alloc_bioset(NULL,
1921 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
1924 &c->dio_read_bioset);
1926 bio->bi_end_io = bch2_direct_IO_read_endio;
1928 dio = container_of(bio, struct dio_read, rbio.bio);
1929 closure_init(&dio->cl, NULL);
1932 * this is a _really_ horrible hack just to avoid an atomic sub at the
1936 set_closure_fn(&dio->cl, bch2_dio_read_complete, NULL);
1937 atomic_set(&dio->cl.remaining,
1938 CLOSURE_REMAINING_INITIALIZER -
1940 CLOSURE_DESTRUCTOR);
1942 atomic_set(&dio->cl.remaining,
1943 CLOSURE_REMAINING_INITIALIZER + 1);
1949 * This is one of the sketchier things I've encountered: we have to skip
1950 * the dirtying of requests that are internal from the kernel (i.e. from
1951 * loopback), because we'll deadlock on page_lock.
1953 dio->should_dirty = iter_is_iovec(iter);
1956 while (iter->count) {
1957 bio = bio_alloc_bioset(NULL,
1958 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
1962 bio->bi_end_io = bch2_direct_IO_read_split_endio;
1964 bio_set_op_attrs(bio, REQ_OP_READ, REQ_SYNC);
1965 bio->bi_iter.bi_sector = offset >> 9;
1966 bio->bi_private = dio;
1968 ret = bio_iov_iter_get_pages(bio, iter);
1970 /* XXX: fault inject this path */
1971 bio->bi_status = BLK_STS_RESOURCE;
1976 offset += bio->bi_iter.bi_size;
1978 if (dio->should_dirty)
1979 bio_set_pages_dirty(bio);
1982 closure_get(&dio->cl);
1984 bch2_read(c, rbio_init(bio, opts), inode_inum(inode));
1987 iter->count += shorten;
1990 closure_sync(&dio->cl);
1991 closure_debug_destroy(&dio->cl);
1993 bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
1996 return -EIOCBQUEUED;
2000 ssize_t bch2_read_iter(struct kiocb *iocb, struct iov_iter *iter)
2002 struct file *file = iocb->ki_filp;
2003 struct bch_inode_info *inode = file_bch_inode(file);
2004 struct address_space *mapping = file->f_mapping;
2005 size_t count = iov_iter_count(iter);
2009 return 0; /* skip atime */
2011 if (iocb->ki_flags & IOCB_DIRECT) {
2012 struct blk_plug plug;
2014 ret = filemap_write_and_wait_range(mapping,
2016 iocb->ki_pos + count - 1);
2020 file_accessed(file);
2022 blk_start_plug(&plug);
2023 ret = bch2_direct_IO_read(iocb, iter);
2024 blk_finish_plug(&plug);
2027 iocb->ki_pos += ret;
2029 bch2_pagecache_add_get(&inode->ei_pagecache_lock);
2030 ret = generic_file_read_iter(iocb, iter);
2031 bch2_pagecache_add_put(&inode->ei_pagecache_lock);
2037 /* O_DIRECT writes */
2039 static bool bch2_check_range_allocated(struct bch_fs *c, subvol_inum inum,
2040 u64 offset, u64 size,
2041 unsigned nr_replicas, bool compressed)
2043 struct btree_trans trans;
2044 struct btree_iter iter;
2046 u64 end = offset + size;
2051 bch2_trans_init(&trans, c, 0, 0);
2053 bch2_trans_begin(&trans);
2055 err = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
2059 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
2060 SPOS(inum.inum, offset, snapshot),
2061 BTREE_ITER_SLOTS, k, err) {
2062 if (bkey_cmp(bkey_start_pos(k.k), POS(inum.inum, end)) >= 0)
2065 if (k.k->p.snapshot != snapshot ||
2066 nr_replicas > bch2_bkey_replicas(c, k) ||
2067 (!compressed && bch2_bkey_sectors_compressed(k))) {
2073 offset = iter.pos.offset;
2074 bch2_trans_iter_exit(&trans, &iter);
2078 bch2_trans_exit(&trans);
2080 return err ? false : ret;
2083 static void bch2_dio_write_loop_async(struct bch_write_op *);
2085 static long bch2_dio_write_loop(struct dio_write *dio)
2087 bool kthread = (current->flags & PF_KTHREAD) != 0;
2088 struct kiocb *req = dio->req;
2089 struct address_space *mapping = req->ki_filp->f_mapping;
2090 struct bch_inode_info *inode = file_bch_inode(req->ki_filp);
2091 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2092 struct bio *bio = &dio->op.wbio.bio;
2093 struct bvec_iter_all iter;
2095 unsigned unaligned, iter_count;
2096 bool sync = dio->sync, dropped_locks;
2102 down(&c->io_in_flight);
2105 iter_count = dio->iter.count;
2107 if (kthread && dio->mm)
2108 kthread_use_mm(dio->mm);
2109 BUG_ON(current->faults_disabled_mapping);
2110 current->faults_disabled_mapping = mapping;
2112 ret = bio_iov_iter_get_pages(bio, &dio->iter);
2114 dropped_locks = fdm_dropped_locks();
2116 current->faults_disabled_mapping = NULL;
2117 if (kthread && dio->mm)
2118 kthread_unuse_mm(dio->mm);
2121 * If the fault handler returned an error but also signalled
2122 * that it dropped & retook ei_pagecache_lock, we just need to
2123 * re-shoot down the page cache and retry:
2125 if (dropped_locks && ret)
2128 if (unlikely(ret < 0))
2131 if (unlikely(dropped_locks)) {
2132 ret = write_invalidate_inode_pages_range(mapping,
2134 req->ki_pos + iter_count - 1);
2138 if (!bio->bi_iter.bi_size)
2142 unaligned = bio->bi_iter.bi_size & (block_bytes(c) - 1);
2143 bio->bi_iter.bi_size -= unaligned;
2144 iov_iter_revert(&dio->iter, unaligned);
2146 if (!bio->bi_iter.bi_size) {
2148 * bio_iov_iter_get_pages was only able to get <
2149 * blocksize worth of pages:
2155 bch2_write_op_init(&dio->op, c, io_opts(c, &inode->ei_inode));
2156 dio->op.end_io = bch2_dio_write_loop_async;
2157 dio->op.target = dio->op.opts.foreground_target;
2158 dio->op.write_point = writepoint_hashed((unsigned long) current);
2159 dio->op.nr_replicas = dio->op.opts.data_replicas;
2160 dio->op.subvol = inode->ei_subvol;
2161 dio->op.pos = POS(inode->v.i_ino, (u64) req->ki_pos >> 9);
2163 if ((req->ki_flags & IOCB_DSYNC) &&
2164 !c->opts.journal_flush_disabled)
2165 dio->op.flags |= BCH_WRITE_FLUSH;
2166 dio->op.flags |= BCH_WRITE_CHECK_ENOSPC;
2168 ret = bch2_disk_reservation_get(c, &dio->op.res, bio_sectors(bio),
2169 dio->op.opts.data_replicas, 0);
2170 if (unlikely(ret) &&
2171 !bch2_check_range_allocated(c, inode_inum(inode),
2172 dio->op.pos.offset, bio_sectors(bio),
2173 dio->op.opts.data_replicas,
2174 dio->op.opts.compression != 0))
2177 task_io_account_write(bio->bi_iter.bi_size);
2179 if (!dio->sync && !dio->loop && dio->iter.count) {
2180 struct iovec *iov = dio->inline_vecs;
2182 if (dio->iter.nr_segs > ARRAY_SIZE(dio->inline_vecs)) {
2183 iov = kmalloc(dio->iter.nr_segs * sizeof(*iov),
2185 if (unlikely(!iov)) {
2186 dio->sync = sync = true;
2190 dio->free_iov = true;
2193 memcpy(iov, dio->iter.iov, dio->iter.nr_segs * sizeof(*iov));
2194 dio->iter.iov = iov;
2198 closure_call(&dio->op.cl, bch2_write, NULL, NULL);
2201 wait_for_completion(&dio->done);
2203 return -EIOCBQUEUED;
2205 i_sectors_acct(c, inode, &dio->quota_res,
2206 dio->op.i_sectors_delta);
2207 req->ki_pos += (u64) dio->op.written << 9;
2208 dio->written += dio->op.written;
2210 spin_lock(&inode->v.i_lock);
2211 if (req->ki_pos > inode->v.i_size)
2212 i_size_write(&inode->v, req->ki_pos);
2213 spin_unlock(&inode->v.i_lock);
2215 if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
2216 bio_for_each_segment_all(bv, bio, iter)
2217 put_page(bv->bv_page);
2220 if (dio->op.error) {
2221 set_bit(EI_INODE_ERROR, &inode->ei_flags);
2225 if (!dio->iter.count)
2228 bio_reset(bio, NULL, REQ_OP_WRITE);
2229 reinit_completion(&dio->done);
2232 ret = dio->op.error ?: ((long) dio->written << 9);
2234 up(&c->io_in_flight);
2235 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2236 bch2_quota_reservation_put(c, inode, &dio->quota_res);
2239 kfree(dio->iter.iov);
2241 if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
2242 bio_for_each_segment_all(bv, bio, iter)
2243 put_page(bv->bv_page);
2246 /* inode->i_dio_count is our ref on inode and thus bch_fs */
2247 inode_dio_end(&inode->v);
2250 req->ki_complete(req, ret);
2256 static void bch2_dio_write_loop_async(struct bch_write_op *op)
2258 struct dio_write *dio = container_of(op, struct dio_write, op);
2261 complete(&dio->done);
2263 bch2_dio_write_loop(dio);
2267 ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
2269 struct file *file = req->ki_filp;
2270 struct address_space *mapping = file->f_mapping;
2271 struct bch_inode_info *inode = file_bch_inode(file);
2272 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2273 struct dio_write *dio;
2275 bool locked = true, extending;
2279 prefetch((void *) &c->opts + 64);
2280 prefetch(&inode->ei_inode);
2281 prefetch((void *) &inode->ei_inode + 64);
2283 inode_lock(&inode->v);
2285 ret = generic_write_checks(req, iter);
2286 if (unlikely(ret <= 0))
2289 ret = file_remove_privs(file);
2293 ret = file_update_time(file);
2297 if (unlikely((req->ki_pos|iter->count) & (block_bytes(c) - 1)))
2300 inode_dio_begin(&inode->v);
2301 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
2303 extending = req->ki_pos + iter->count > inode->v.i_size;
2305 inode_unlock(&inode->v);
2309 bio = bio_alloc_bioset(NULL,
2310 bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
2313 &c->dio_write_bioset);
2314 dio = container_of(bio, struct dio_write, op.wbio.bio);
2315 init_completion(&dio->done);
2317 dio->mm = current->mm;
2319 dio->sync = is_sync_kiocb(req) || extending;
2320 dio->free_iov = false;
2321 dio->quota_res.sectors = 0;
2325 ret = bch2_quota_reservation_add(c, inode, &dio->quota_res,
2326 iter->count >> 9, true);
2330 ret = write_invalidate_inode_pages_range(mapping,
2332 req->ki_pos + iter->count - 1);
2336 ret = bch2_dio_write_loop(dio);
2339 inode_unlock(&inode->v);
2342 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2343 bch2_quota_reservation_put(c, inode, &dio->quota_res);
2345 inode_dio_end(&inode->v);
2349 ssize_t bch2_write_iter(struct kiocb *iocb, struct iov_iter *from)
2351 struct file *file = iocb->ki_filp;
2352 struct bch_inode_info *inode = file_bch_inode(file);
2355 if (iocb->ki_flags & IOCB_DIRECT)
2356 return bch2_direct_write(iocb, from);
2358 /* We can write back this queue in page reclaim */
2359 current->backing_dev_info = inode_to_bdi(&inode->v);
2360 inode_lock(&inode->v);
2362 ret = generic_write_checks(iocb, from);
2366 ret = file_remove_privs(file);
2370 ret = file_update_time(file);
2374 ret = bch2_buffered_write(iocb, from);
2375 if (likely(ret > 0))
2376 iocb->ki_pos += ret;
2378 inode_unlock(&inode->v);
2379 current->backing_dev_info = NULL;
2382 ret = generic_write_sync(iocb, ret);
2390 * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an
2391 * insert trigger: look up the btree inode instead
2393 static int bch2_flush_inode(struct bch_fs *c, subvol_inum inum)
2395 struct bch_inode_unpacked inode;
2398 if (c->opts.journal_flush_disabled)
2401 ret = bch2_inode_find_by_inum(c, inum, &inode);
2405 return bch2_journal_flush_seq(&c->journal, inode.bi_journal_seq);
2408 int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2410 struct bch_inode_info *inode = file_bch_inode(file);
2411 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2412 int ret, ret2, ret3;
2414 ret = file_write_and_wait_range(file, start, end);
2415 ret2 = sync_inode_metadata(&inode->v, 1);
2416 ret3 = bch2_flush_inode(c, inode_inum(inode));
2418 return ret ?: ret2 ?: ret3;
2423 static inline int range_has_data(struct bch_fs *c, u32 subvol,
2427 struct btree_trans trans;
2428 struct btree_iter iter;
2432 bch2_trans_init(&trans, c, 0, 0);
2434 bch2_trans_begin(&trans);
2436 ret = bch2_subvolume_get_snapshot(&trans, subvol, &start.snapshot);
2440 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents, start, 0, k, ret) {
2441 if (bkey_cmp(bkey_start_pos(k.k), end) >= 0)
2444 if (bkey_extent_is_data(k.k)) {
2450 bch2_trans_iter_exit(&trans, &iter);
2455 bch2_trans_exit(&trans);
2459 static int __bch2_truncate_page(struct bch_inode_info *inode,
2460 pgoff_t index, loff_t start, loff_t end)
2462 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2463 struct address_space *mapping = inode->v.i_mapping;
2464 struct bch_page_state *s;
2465 unsigned start_offset = start & (PAGE_SIZE - 1);
2466 unsigned end_offset = ((end - 1) & (PAGE_SIZE - 1)) + 1;
2469 s64 i_sectors_delta = 0;
2472 /* Page boundary? Nothing to do */
2473 if (!((index == start >> PAGE_SHIFT && start_offset) ||
2474 (index == end >> PAGE_SHIFT && end_offset != PAGE_SIZE)))
2478 if (index << PAGE_SHIFT >= inode->v.i_size)
2481 page = find_lock_page(mapping, index);
2484 * XXX: we're doing two index lookups when we end up reading the
2487 ret = range_has_data(c, inode->ei_subvol,
2488 POS(inode->v.i_ino, index << PAGE_SECTORS_SHIFT),
2489 POS(inode->v.i_ino, (index + 1) << PAGE_SECTORS_SHIFT));
2493 page = find_or_create_page(mapping, index, GFP_KERNEL);
2494 if (unlikely(!page)) {
2500 s = bch2_page_state_create(page, 0);
2506 if (!PageUptodate(page)) {
2507 ret = bch2_read_single_page(page, mapping);
2512 if (index != start >> PAGE_SHIFT)
2514 if (index != end >> PAGE_SHIFT)
2515 end_offset = PAGE_SIZE;
2517 for (i = round_up(start_offset, block_bytes(c)) >> 9;
2518 i < round_down(end_offset, block_bytes(c)) >> 9;
2520 s->s[i].nr_replicas = 0;
2521 if (s->s[i].state == SECTOR_DIRTY)
2523 s->s[i].state = SECTOR_UNALLOCATED;
2526 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2529 * Caller needs to know whether this page will be written out by
2530 * writeback - doing an i_size update if necessary - or whether it will
2531 * be responsible for the i_size update:
2533 ret = s->s[(min_t(u64, inode->v.i_size - (index << PAGE_SHIFT),
2534 PAGE_SIZE) - 1) >> 9].state >= SECTOR_DIRTY;
2536 zero_user_segment(page, start_offset, end_offset);
2539 * Bit of a hack - we don't want truncate to fail due to -ENOSPC.
2541 * XXX: because we aren't currently tracking whether the page has actual
2542 * data in it (vs. just 0s, or only partially written) this wrong. ick.
2544 BUG_ON(bch2_get_page_disk_reservation(c, inode, page, false));
2547 * This removes any writeable userspace mappings; we need to force
2548 * .page_mkwrite to be called again before any mmapped writes, to
2549 * redirty the full page:
2552 __set_page_dirty_nobuffers(page);
2560 static int bch2_truncate_page(struct bch_inode_info *inode, loff_t from)
2562 return __bch2_truncate_page(inode, from >> PAGE_SHIFT,
2563 from, round_up(from, PAGE_SIZE));
2566 static int bch2_truncate_pages(struct bch_inode_info *inode,
2567 loff_t start, loff_t end)
2569 int ret = __bch2_truncate_page(inode, start >> PAGE_SHIFT,
2573 start >> PAGE_SHIFT != end >> PAGE_SHIFT)
2574 ret = __bch2_truncate_page(inode,
2580 static int bch2_extend(struct user_namespace *mnt_userns,
2581 struct bch_inode_info *inode,
2582 struct bch_inode_unpacked *inode_u,
2583 struct iattr *iattr)
2585 struct address_space *mapping = inode->v.i_mapping;
2591 * this has to be done _before_ extending i_size:
2593 ret = filemap_write_and_wait_range(mapping, inode_u->bi_size, S64_MAX);
2597 truncate_setsize(&inode->v, iattr->ia_size);
2599 return bch2_setattr_nonsize(mnt_userns, inode, iattr);
2602 static int bch2_truncate_finish_fn(struct bch_inode_info *inode,
2603 struct bch_inode_unpacked *bi,
2606 bi->bi_flags &= ~BCH_INODE_I_SIZE_DIRTY;
2610 static int bch2_truncate_start_fn(struct bch_inode_info *inode,
2611 struct bch_inode_unpacked *bi, void *p)
2613 u64 *new_i_size = p;
2615 bi->bi_flags |= BCH_INODE_I_SIZE_DIRTY;
2616 bi->bi_size = *new_i_size;
2620 int bch2_truncate(struct user_namespace *mnt_userns,
2621 struct bch_inode_info *inode, struct iattr *iattr)
2623 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2624 struct address_space *mapping = inode->v.i_mapping;
2625 struct bch_inode_unpacked inode_u;
2626 u64 new_i_size = iattr->ia_size;
2627 s64 i_sectors_delta = 0;
2631 * If the truncate call with change the size of the file, the
2632 * cmtimes should be updated. If the size will not change, we
2633 * do not need to update the cmtimes.
2635 if (iattr->ia_size != inode->v.i_size) {
2636 if (!(iattr->ia_valid & ATTR_MTIME))
2637 ktime_get_coarse_real_ts64(&iattr->ia_mtime);
2638 if (!(iattr->ia_valid & ATTR_CTIME))
2639 ktime_get_coarse_real_ts64(&iattr->ia_ctime);
2640 iattr->ia_valid |= ATTR_MTIME|ATTR_CTIME;
2643 inode_dio_wait(&inode->v);
2644 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
2646 ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);
2651 * check this before next assertion; on filesystem error our normal
2652 * invariants are a bit broken (truncate has to truncate the page cache
2653 * before the inode).
2655 ret = bch2_journal_error(&c->journal);
2659 WARN_ON(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
2660 inode->v.i_size < inode_u.bi_size);
2662 if (iattr->ia_size > inode->v.i_size) {
2663 ret = bch2_extend(mnt_userns, inode, &inode_u, iattr);
2667 iattr->ia_valid &= ~ATTR_SIZE;
2669 ret = bch2_truncate_page(inode, iattr->ia_size);
2670 if (unlikely(ret < 0))
2674 * When extending, we're going to write the new i_size to disk
2675 * immediately so we need to flush anything above the current on disk
2678 * Also, when extending we need to flush the page that i_size currently
2679 * straddles - if it's mapped to userspace, we need to ensure that
2680 * userspace has to redirty it and call .mkwrite -> set_page_dirty
2681 * again to allocate the part of the page that was extended.
2683 if (iattr->ia_size > inode_u.bi_size)
2684 ret = filemap_write_and_wait_range(mapping,
2686 iattr->ia_size - 1);
2687 else if (iattr->ia_size & (PAGE_SIZE - 1))
2688 ret = filemap_write_and_wait_range(mapping,
2689 round_down(iattr->ia_size, PAGE_SIZE),
2690 iattr->ia_size - 1);
2694 mutex_lock(&inode->ei_update_lock);
2695 ret = bch2_write_inode(c, inode, bch2_truncate_start_fn,
2697 mutex_unlock(&inode->ei_update_lock);
2702 truncate_setsize(&inode->v, iattr->ia_size);
2704 ret = bch2_fpunch(c, inode_inum(inode),
2705 round_up(iattr->ia_size, block_bytes(c)) >> 9,
2706 U64_MAX, &i_sectors_delta);
2707 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2709 bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&
2710 !bch2_journal_error(&c->journal), c,
2711 "inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",
2712 inode->v.i_ino, (u64) inode->v.i_blocks,
2713 inode->ei_inode.bi_sectors);
2717 mutex_lock(&inode->ei_update_lock);
2718 ret = bch2_write_inode(c, inode, bch2_truncate_finish_fn, NULL, 0);
2719 mutex_unlock(&inode->ei_update_lock);
2721 ret = bch2_setattr_nonsize(mnt_userns, inode, iattr);
2723 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
2729 static int inode_update_times_fn(struct bch_inode_info *inode,
2730 struct bch_inode_unpacked *bi, void *p)
2732 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2734 bi->bi_mtime = bi->bi_ctime = bch2_current_time(c);
2738 static long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)
2740 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2741 u64 end = offset + len;
2742 u64 block_start = round_up(offset, block_bytes(c));
2743 u64 block_end = round_down(end, block_bytes(c));
2744 bool truncated_last_page;
2747 ret = bch2_truncate_pages(inode, offset, end);
2748 if (unlikely(ret < 0))
2751 truncated_last_page = ret;
2753 truncate_pagecache_range(&inode->v, offset, end - 1);
2755 if (block_start < block_end ) {
2756 s64 i_sectors_delta = 0;
2758 ret = bch2_fpunch(c, inode_inum(inode),
2759 block_start >> 9, block_end >> 9,
2761 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2764 mutex_lock(&inode->ei_update_lock);
2765 if (end >= inode->v.i_size && !truncated_last_page) {
2766 ret = bch2_write_inode_size(c, inode, inode->v.i_size,
2767 ATTR_MTIME|ATTR_CTIME);
2769 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
2770 ATTR_MTIME|ATTR_CTIME);
2772 mutex_unlock(&inode->ei_update_lock);
2777 static long bchfs_fcollapse_finsert(struct bch_inode_info *inode,
2778 loff_t offset, loff_t len,
2781 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2782 struct address_space *mapping = inode->v.i_mapping;
2783 struct bkey_buf copy;
2784 struct btree_trans trans;
2785 struct btree_iter src, dst, del;
2786 loff_t shift, new_size;
2790 if ((offset | len) & (block_bytes(c) - 1))
2794 if (inode->v.i_sb->s_maxbytes - inode->v.i_size < len)
2797 if (offset >= inode->v.i_size)
2800 src_start = U64_MAX;
2803 if (offset + len >= inode->v.i_size)
2806 src_start = offset + len;
2810 new_size = inode->v.i_size + shift;
2812 ret = write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
2817 i_size_write(&inode->v, new_size);
2818 mutex_lock(&inode->ei_update_lock);
2819 ret = bch2_write_inode_size(c, inode, new_size,
2820 ATTR_MTIME|ATTR_CTIME);
2821 mutex_unlock(&inode->ei_update_lock);
2823 s64 i_sectors_delta = 0;
2825 ret = bch2_fpunch(c, inode_inum(inode),
2826 offset >> 9, (offset + len) >> 9,
2828 i_sectors_acct(c, inode, NULL, i_sectors_delta);
2834 bch2_bkey_buf_init(©);
2835 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 1024);
2836 bch2_trans_iter_init(&trans, &src, BTREE_ID_extents,
2837 POS(inode->v.i_ino, src_start >> 9),
2839 bch2_trans_copy_iter(&dst, &src);
2840 bch2_trans_copy_iter(&del, &src);
2842 while (ret == 0 || ret == -EINTR) {
2843 struct disk_reservation disk_res =
2844 bch2_disk_reservation_init(c, 0);
2845 struct bkey_i delete;
2847 struct bpos next_pos;
2848 struct bpos move_pos = POS(inode->v.i_ino, offset >> 9);
2849 struct bpos atomic_end;
2850 unsigned trigger_flags = 0;
2853 bch2_trans_begin(&trans);
2855 ret = bch2_subvolume_get_snapshot(&trans,
2856 inode->ei_subvol, &snapshot);
2860 bch2_btree_iter_set_snapshot(&src, snapshot);
2861 bch2_btree_iter_set_snapshot(&dst, snapshot);
2862 bch2_btree_iter_set_snapshot(&del, snapshot);
2864 bch2_trans_begin(&trans);
2867 ? bch2_btree_iter_peek_prev(&src)
2868 : bch2_btree_iter_peek(&src);
2869 if ((ret = bkey_err(k)))
2872 if (!k.k || k.k->p.inode != inode->v.i_ino)
2876 bkey_cmp(k.k->p, POS(inode->v.i_ino, offset >> 9)) <= 0)
2879 bch2_bkey_buf_reassemble(©, c, k);
2882 bkey_cmp(bkey_start_pos(k.k), move_pos) < 0)
2883 bch2_cut_front(move_pos, copy.k);
2885 copy.k->k.p.offset += shift >> 9;
2886 bch2_btree_iter_set_pos(&dst, bkey_start_pos(©.k->k));
2888 ret = bch2_extent_atomic_end(&trans, &dst, copy.k, &atomic_end);
2892 if (bkey_cmp(atomic_end, copy.k->k.p)) {
2894 move_pos = atomic_end;
2895 move_pos.offset -= shift >> 9;
2898 bch2_cut_back(atomic_end, copy.k);
2902 bkey_init(&delete.k);
2903 delete.k.p = copy.k->k.p;
2904 delete.k.size = copy.k->k.size;
2905 delete.k.p.offset -= shift >> 9;
2906 bch2_btree_iter_set_pos(&del, bkey_start_pos(&delete.k));
2908 next_pos = insert ? bkey_start_pos(&delete.k) : delete.k.p;
2910 if (copy.k->k.size != k.k->size) {
2911 /* We might end up splitting compressed extents: */
2913 bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy.k));
2915 ret = bch2_disk_reservation_get(c, &disk_res,
2916 copy.k->k.size, nr_ptrs,
2917 BCH_DISK_RESERVATION_NOFAIL);
2921 ret = bch2_btree_iter_traverse(&del) ?:
2922 bch2_trans_update(&trans, &del, &delete, trigger_flags) ?:
2923 bch2_trans_update(&trans, &dst, copy.k, trigger_flags) ?:
2924 bch2_trans_commit(&trans, &disk_res, NULL,
2925 BTREE_INSERT_NOFAIL);
2926 bch2_disk_reservation_put(c, &disk_res);
2929 bch2_btree_iter_set_pos(&src, next_pos);
2931 bch2_trans_iter_exit(&trans, &del);
2932 bch2_trans_iter_exit(&trans, &dst);
2933 bch2_trans_iter_exit(&trans, &src);
2934 bch2_trans_exit(&trans);
2935 bch2_bkey_buf_exit(©, c);
2940 mutex_lock(&inode->ei_update_lock);
2942 i_size_write(&inode->v, new_size);
2943 ret = bch2_write_inode_size(c, inode, new_size,
2944 ATTR_MTIME|ATTR_CTIME);
2946 /* We need an inode update to update bi_journal_seq for fsync: */
2947 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
2948 ATTR_MTIME|ATTR_CTIME);
2950 mutex_unlock(&inode->ei_update_lock);
2954 static int __bchfs_fallocate(struct bch_inode_info *inode, int mode,
2955 u64 start_sector, u64 end_sector)
2957 struct bch_fs *c = inode->v.i_sb->s_fs_info;
2958 struct btree_trans trans;
2959 struct btree_iter iter;
2960 struct bpos end_pos = POS(inode->v.i_ino, end_sector);
2961 unsigned replicas = io_opts(c, &inode->ei_inode).data_replicas;
2964 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 512);
2966 bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
2967 POS(inode->v.i_ino, start_sector),
2968 BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
2970 while (!ret && bkey_cmp(iter.pos, end_pos) < 0) {
2971 s64 i_sectors_delta = 0;
2972 struct disk_reservation disk_res = { 0 };
2973 struct quota_res quota_res = { 0 };
2974 struct bkey_i_reservation reservation;
2979 bch2_trans_begin(&trans);
2981 ret = bch2_subvolume_get_snapshot(&trans,
2982 inode->ei_subvol, &snapshot);
2986 bch2_btree_iter_set_snapshot(&iter, snapshot);
2988 k = bch2_btree_iter_peek_slot(&iter);
2989 if ((ret = bkey_err(k)))
2992 /* already reserved */
2993 if (k.k->type == KEY_TYPE_reservation &&
2994 bkey_s_c_to_reservation(k).v->nr_replicas >= replicas) {
2995 bch2_btree_iter_advance(&iter);
2999 if (bkey_extent_is_data(k.k) &&
3000 !(mode & FALLOC_FL_ZERO_RANGE)) {
3001 bch2_btree_iter_advance(&iter);
3005 bkey_reservation_init(&reservation.k_i);
3006 reservation.k.type = KEY_TYPE_reservation;
3007 reservation.k.p = k.k->p;
3008 reservation.k.size = k.k->size;
3010 bch2_cut_front(iter.pos, &reservation.k_i);
3011 bch2_cut_back(end_pos, &reservation.k_i);
3013 sectors = reservation.k.size;
3014 reservation.v.nr_replicas = bch2_bkey_nr_ptrs_allocated(k);
3016 if (!bkey_extent_is_allocation(k.k)) {
3017 ret = bch2_quota_reservation_add(c, inode,
3024 if (reservation.v.nr_replicas < replicas ||
3025 bch2_bkey_sectors_compressed(k)) {
3026 ret = bch2_disk_reservation_get(c, &disk_res, sectors,
3031 reservation.v.nr_replicas = disk_res.nr_replicas;
3034 ret = bch2_extent_update(&trans, inode_inum(inode), &iter,
3037 0, &i_sectors_delta, true);
3040 i_sectors_acct(c, inode, "a_res, i_sectors_delta);
3042 bch2_quota_reservation_put(c, inode, "a_res);
3043 bch2_disk_reservation_put(c, &disk_res);
3048 bch2_trans_unlock(&trans); /* lock ordering, before taking pagecache locks: */
3049 mark_pagecache_reserved(inode, start_sector, iter.pos.offset);
3051 if (ret == -ENOSPC && (mode & FALLOC_FL_ZERO_RANGE)) {
3052 struct quota_res quota_res = { 0 };
3053 s64 i_sectors_delta = 0;
3055 bch2_fpunch_at(&trans, &iter, inode_inum(inode),
3056 end_sector, &i_sectors_delta);
3057 i_sectors_acct(c, inode, "a_res, i_sectors_delta);
3058 bch2_quota_reservation_put(c, inode, "a_res);
3061 bch2_trans_iter_exit(&trans, &iter);
3062 bch2_trans_exit(&trans);
3066 static long bchfs_fallocate(struct bch_inode_info *inode, int mode,
3067 loff_t offset, loff_t len)
3069 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3070 u64 end = offset + len;
3071 u64 block_start = round_down(offset, block_bytes(c));
3072 u64 block_end = round_up(end, block_bytes(c));
3073 bool truncated_last_page = false;
3076 if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {
3077 ret = inode_newsize_ok(&inode->v, end);
3082 if (mode & FALLOC_FL_ZERO_RANGE) {
3083 ret = bch2_truncate_pages(inode, offset, end);
3084 if (unlikely(ret < 0))
3087 truncated_last_page = ret;
3089 truncate_pagecache_range(&inode->v, offset, end - 1);
3091 block_start = round_up(offset, block_bytes(c));
3092 block_end = round_down(end, block_bytes(c));
3095 ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);
3098 * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,
3099 * so that the VFS cache i_size is consistent with the btree i_size:
3102 !(ret == -ENOSPC && (mode & FALLOC_FL_ZERO_RANGE)))
3105 if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)
3106 end = inode->v.i_size;
3108 if (end >= inode->v.i_size &&
3109 (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||
3110 !(mode & FALLOC_FL_KEEP_SIZE))) {
3111 spin_lock(&inode->v.i_lock);
3112 i_size_write(&inode->v, end);
3113 spin_unlock(&inode->v.i_lock);
3115 mutex_lock(&inode->ei_update_lock);
3116 ret2 = bch2_write_inode_size(c, inode, end, 0);
3117 mutex_unlock(&inode->ei_update_lock);
3123 long bch2_fallocate_dispatch(struct file *file, int mode,
3124 loff_t offset, loff_t len)
3126 struct bch_inode_info *inode = file_bch_inode(file);
3127 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3130 if (!percpu_ref_tryget_live(&c->writes))
3133 inode_lock(&inode->v);
3134 inode_dio_wait(&inode->v);
3135 bch2_pagecache_block_get(&inode->ei_pagecache_lock);
3137 if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
3138 ret = bchfs_fallocate(inode, mode, offset, len);
3139 else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
3140 ret = bchfs_fpunch(inode, offset, len);
3141 else if (mode == FALLOC_FL_INSERT_RANGE)
3142 ret = bchfs_fcollapse_finsert(inode, offset, len, true);
3143 else if (mode == FALLOC_FL_COLLAPSE_RANGE)
3144 ret = bchfs_fcollapse_finsert(inode, offset, len, false);
3149 bch2_pagecache_block_put(&inode->ei_pagecache_lock);
3150 inode_unlock(&inode->v);
3151 percpu_ref_put(&c->writes);
3156 loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
3157 struct file *file_dst, loff_t pos_dst,
3158 loff_t len, unsigned remap_flags)
3160 struct bch_inode_info *src = file_bch_inode(file_src);
3161 struct bch_inode_info *dst = file_bch_inode(file_dst);
3162 struct bch_fs *c = src->v.i_sb->s_fs_info;
3163 s64 i_sectors_delta = 0;
3167 if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))
3170 if (remap_flags & REMAP_FILE_DEDUP)
3173 if ((pos_src & (block_bytes(c) - 1)) ||
3174 (pos_dst & (block_bytes(c) - 1)))
3178 abs(pos_src - pos_dst) < len)
3181 bch2_lock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
3183 file_update_time(file_dst);
3185 inode_dio_wait(&src->v);
3186 inode_dio_wait(&dst->v);
3188 ret = generic_remap_file_range_prep(file_src, pos_src,
3191 if (ret < 0 || len == 0)
3194 aligned_len = round_up((u64) len, block_bytes(c));
3196 ret = write_invalidate_inode_pages_range(dst->v.i_mapping,
3197 pos_dst, pos_dst + len - 1);
3201 mark_pagecache_unallocated(src, pos_src >> 9,
3202 (pos_src + aligned_len) >> 9);
3204 ret = bch2_remap_range(c,
3205 inode_inum(dst), pos_dst >> 9,
3206 inode_inum(src), pos_src >> 9,
3208 pos_dst + len, &i_sectors_delta);
3213 * due to alignment, we might have remapped slightly more than requsted
3215 ret = min((u64) ret << 9, (u64) len);
3217 /* XXX get a quota reservation */
3218 i_sectors_acct(c, dst, NULL, i_sectors_delta);
3220 spin_lock(&dst->v.i_lock);
3221 if (pos_dst + ret > dst->v.i_size)
3222 i_size_write(&dst->v, pos_dst + ret);
3223 spin_unlock(&dst->v.i_lock);
3225 if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
3226 IS_SYNC(file_inode(file_dst)))
3227 ret = bch2_flush_inode(c, inode_inum(dst));
3229 bch2_unlock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
3236 static int page_data_offset(struct page *page, unsigned offset)
3238 struct bch_page_state *s = bch2_page_state(page);
3242 for (i = offset >> 9; i < PAGE_SECTORS; i++)
3243 if (s->s[i].state >= SECTOR_DIRTY)
3249 static loff_t bch2_seek_pagecache_data(struct inode *vinode,
3250 loff_t start_offset,
3253 struct address_space *mapping = vinode->i_mapping;
3255 pgoff_t start_index = start_offset >> PAGE_SHIFT;
3256 pgoff_t end_index = end_offset >> PAGE_SHIFT;
3257 pgoff_t index = start_index;
3261 while (index <= end_index) {
3262 if (find_get_pages_range(mapping, &index, end_index, 1, &page)) {
3265 offset = page_data_offset(page,
3266 page->index == start_index
3267 ? start_offset & (PAGE_SIZE - 1)
3270 ret = clamp(((loff_t) page->index << PAGE_SHIFT) +
3272 start_offset, end_offset);
3288 static loff_t bch2_seek_data(struct file *file, u64 offset)
3290 struct bch_inode_info *inode = file_bch_inode(file);
3291 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3292 struct btree_trans trans;
3293 struct btree_iter iter;
3295 subvol_inum inum = inode_inum(inode);
3296 u64 isize, next_data = MAX_LFS_FILESIZE;
3300 isize = i_size_read(&inode->v);
3301 if (offset >= isize)
3304 bch2_trans_init(&trans, c, 0, 0);
3306 bch2_trans_begin(&trans);
3308 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
3312 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
3313 SPOS(inode->v.i_ino, offset >> 9, snapshot), 0, k, ret) {
3314 if (k.k->p.inode != inode->v.i_ino) {
3316 } else if (bkey_extent_is_data(k.k)) {
3317 next_data = max(offset, bkey_start_offset(k.k) << 9);
3319 } else if (k.k->p.offset >> 9 > isize)
3322 bch2_trans_iter_exit(&trans, &iter);
3327 bch2_trans_exit(&trans);
3331 if (next_data > offset)
3332 next_data = bch2_seek_pagecache_data(&inode->v,
3335 if (next_data >= isize)
3338 return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
3341 static int __page_hole_offset(struct page *page, unsigned offset)
3343 struct bch_page_state *s = bch2_page_state(page);
3349 for (i = offset >> 9; i < PAGE_SECTORS; i++)
3350 if (s->s[i].state < SECTOR_DIRTY)
3356 static loff_t page_hole_offset(struct address_space *mapping, loff_t offset)
3358 pgoff_t index = offset >> PAGE_SHIFT;
3363 page = find_lock_page(mapping, index);
3367 pg_offset = __page_hole_offset(page, offset & (PAGE_SIZE - 1));
3369 ret = ((loff_t) index << PAGE_SHIFT) + pg_offset;
3376 static loff_t bch2_seek_pagecache_hole(struct inode *vinode,
3377 loff_t start_offset,
3380 struct address_space *mapping = vinode->i_mapping;
3381 loff_t offset = start_offset, hole;
3383 while (offset < end_offset) {
3384 hole = page_hole_offset(mapping, offset);
3385 if (hole >= 0 && hole <= end_offset)
3386 return max(start_offset, hole);
3388 offset += PAGE_SIZE;
3389 offset &= PAGE_MASK;
3395 static loff_t bch2_seek_hole(struct file *file, u64 offset)
3397 struct bch_inode_info *inode = file_bch_inode(file);
3398 struct bch_fs *c = inode->v.i_sb->s_fs_info;
3399 struct btree_trans trans;
3400 struct btree_iter iter;
3402 subvol_inum inum = inode_inum(inode);
3403 u64 isize, next_hole = MAX_LFS_FILESIZE;
3407 isize = i_size_read(&inode->v);
3408 if (offset >= isize)
3411 bch2_trans_init(&trans, c, 0, 0);
3413 bch2_trans_begin(&trans);
3415 ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
3419 for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
3420 SPOS(inode->v.i_ino, offset >> 9, snapshot),
3421 BTREE_ITER_SLOTS, k, ret) {
3422 if (k.k->p.inode != inode->v.i_ino) {
3423 next_hole = bch2_seek_pagecache_hole(&inode->v,
3424 offset, MAX_LFS_FILESIZE);
3426 } else if (!bkey_extent_is_data(k.k)) {
3427 next_hole = bch2_seek_pagecache_hole(&inode->v,
3428 max(offset, bkey_start_offset(k.k) << 9),
3429 k.k->p.offset << 9);
3431 if (next_hole < k.k->p.offset << 9)
3434 offset = max(offset, bkey_start_offset(k.k) << 9);
3437 bch2_trans_iter_exit(&trans, &iter);
3442 bch2_trans_exit(&trans);
3446 if (next_hole > isize)
3449 return vfs_setpos(file, next_hole, MAX_LFS_FILESIZE);
3452 loff_t bch2_llseek(struct file *file, loff_t offset, int whence)
3458 return generic_file_llseek(file, offset, whence);
3460 return bch2_seek_data(file, offset);
3462 return bch2_seek_hole(file, offset);
3468 void bch2_fs_fsio_exit(struct bch_fs *c)
3470 bioset_exit(&c->dio_write_bioset);
3471 bioset_exit(&c->dio_read_bioset);
3472 bioset_exit(&c->writepage_bioset);
3475 int bch2_fs_fsio_init(struct bch_fs *c)
3479 pr_verbose_init(c->opts, "");
3481 if (bioset_init(&c->writepage_bioset,
3482 4, offsetof(struct bch_writepage_io, op.wbio.bio),
3483 BIOSET_NEED_BVECS) ||
3484 bioset_init(&c->dio_read_bioset,
3485 4, offsetof(struct dio_read, rbio.bio),
3486 BIOSET_NEED_BVECS) ||
3487 bioset_init(&c->dio_write_bioset,
3488 4, offsetof(struct dio_write, op.wbio.bio),
3492 pr_verbose_init(c->opts, "ret %i", ret);
3496 #endif /* NO_BCACHEFS_FS */