#include "extent_update.h"
#include "fs.h"
#include "fs-io.h"
+#include "fs-io-buffered.h"
+#include "fs-io-pagecache.h"
#include "fsck.h"
#include "inode.h"
#include "journal.h"
-#include "io.h"
+#include "io_misc.h"
#include "keylist.h"
#include "quota.h"
#include "reflink.h"
#include <linux/sched/signal.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/uio.h>
-#include <linux/writeback.h>
#include <trace/events/writeback.h>
-static int bch2_clamp_data_hole(struct inode *, u64 *, u64 *, unsigned, bool);
-
-struct folio_vec {
- struct folio *fv_folio;
- size_t fv_offset;
- size_t fv_len;
-};
-
-static inline struct folio_vec biovec_to_foliovec(struct bio_vec bv)
-{
-
- struct folio *folio = page_folio(bv.bv_page);
- size_t offset = (folio_page_idx(folio, bv.bv_page) << PAGE_SHIFT) +
- bv.bv_offset;
- size_t len = min_t(size_t, folio_size(folio) - offset, bv.bv_len);
-
- return (struct folio_vec) {
- .fv_folio = folio,
- .fv_offset = offset,
- .fv_len = len,
- };
-}
-
-static inline struct folio_vec bio_iter_iovec_folio(struct bio *bio,
- struct bvec_iter iter)
-{
- return biovec_to_foliovec(bio_iter_iovec(bio, iter));
-}
-
-#define __bio_for_each_folio(bvl, bio, iter, start) \
- for (iter = (start); \
- (iter).bi_size && \
- ((bvl = bio_iter_iovec_folio((bio), (iter))), 1); \
- bio_advance_iter_single((bio), &(iter), (bvl).fv_len))
-
-/**
- * bio_for_each_folio - iterate over folios within a bio
- *
- * Like other non-_all versions, this iterates over what bio->bi_iter currently
- * points to. This version is for drivers, where the bio may have previously
- * been split or cloned.
- */
-#define bio_for_each_folio(bvl, bio, iter) \
- __bio_for_each_folio(bvl, bio, iter, (bio)->bi_iter)
-
-/*
- * Use u64 for the end pos and sector helpers because if the folio covers the
- * max supported range of the mapping, the start offset of the next folio
- * overflows loff_t. This breaks much of the range based processing in the
- * buffered write path.
- */
-static inline u64 folio_end_pos(struct folio *folio)
-{
- return folio_pos(folio) + folio_size(folio);
-}
-
-static inline size_t folio_sectors(struct folio *folio)
-{
- return PAGE_SECTORS << folio_order(folio);
-}
-
-static inline loff_t folio_sector(struct folio *folio)
-{
- return folio_pos(folio) >> 9;
-}
-
-static inline u64 folio_end_sector(struct folio *folio)
-{
- return folio_end_pos(folio) >> 9;
-}
-
-typedef DARRAY(struct folio *) folios;
-
-static int filemap_get_contig_folios_d(struct address_space *mapping,
- loff_t start, u64 end,
- int fgp_flags, gfp_t gfp,
- folios *folios)
-{
- struct folio *f;
- u64 pos = start;
- int ret = 0;
-
- while (pos < end) {
- if ((u64) pos >= (u64) start + (1ULL << 20))
- fgp_flags &= ~FGP_CREAT;
-
- ret = darray_make_room_gfp(folios, 1, gfp & GFP_KERNEL);
- if (ret)
- break;
-
- f = __filemap_get_folio(mapping, pos >> PAGE_SHIFT, fgp_flags, gfp);
- if (IS_ERR_OR_NULL(f))
- break;
-
- BUG_ON(folios->nr && folio_pos(f) != pos);
-
- pos = folio_end_pos(f);
- darray_push(folios, f);
- }
-
- if (!folios->nr && !ret && (fgp_flags & FGP_CREAT))
- ret = -ENOMEM;
-
- return folios->nr ? 0 : ret;
-}
-
struct nocow_flush {
struct closure *cl;
struct bch_dev *ca;
bio_put(&bio->bio);
}
-static void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct closure *cl)
+void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ struct closure *cl)
{
struct nocow_flush *bio;
struct bch_dev *ca;
struct nocow_flush, bio);
bio->cl = cl;
bio->ca = ca;
- bio->bio.bi_end_io = nocow_flush_endio;
- closure_bio_submit(&bio->bio, cl);
- }
-}
-
-static int bch2_inode_flush_nocow_writes(struct bch_fs *c,
- struct bch_inode_info *inode)
-{
- struct closure cl;
-
- closure_init_stack(&cl);
- bch2_inode_flush_nocow_writes_async(c, inode, &cl);
- closure_sync(&cl);
-
- return 0;
-}
-
-static inline bool bio_full(struct bio *bio, unsigned len)
-{
- if (bio->bi_vcnt >= bio->bi_max_vecs)
- return true;
- if (bio->bi_iter.bi_size > UINT_MAX - len)
- return true;
- return false;
-}
-
-static inline struct address_space *faults_disabled_mapping(void)
-{
- return (void *) (((unsigned long) current->faults_disabled_mapping) & ~1UL);
-}
-
-static inline void set_fdm_dropped_locks(void)
-{
- current->faults_disabled_mapping =
- (void *) (((unsigned long) current->faults_disabled_mapping)|1);
-}
-
-static inline bool fdm_dropped_locks(void)
-{
- return ((unsigned long) current->faults_disabled_mapping) & 1;
-}
-
-struct quota_res {
- u64 sectors;
-};
-
-struct bch_writepage_io {
- struct bch_inode_info *inode;
-
- /* must be last: */
- struct bch_write_op op;
-};
-
-struct dio_write {
- struct kiocb *req;
- struct address_space *mapping;
- struct bch_inode_info *inode;
- struct mm_struct *mm;
- unsigned loop:1,
- extending:1,
- sync:1,
- flush:1,
- free_iov:1;
- struct quota_res quota_res;
- u64 written;
-
- struct iov_iter iter;
- struct iovec inline_vecs[2];
-
- /* must be last: */
- struct bch_write_op op;
-};
-
-struct dio_read {
- struct closure cl;
- struct kiocb *req;
- long ret;
- bool should_dirty;
- struct bch_read_bio rbio;
-};
-
-/* pagecache_block must be held */
-static noinline int write_invalidate_inode_pages_range(struct address_space *mapping,
- loff_t start, loff_t end)
-{
- int ret;
-
- /*
- * XXX: the way this is currently implemented, we can spin if a process
- * is continually redirtying a specific page
- */
- do {
- if (!mapping->nrpages)
- return 0;
-
- ret = filemap_write_and_wait_range(mapping, start, end);
- if (ret)
- break;
-
- if (!mapping->nrpages)
- return 0;
-
- ret = invalidate_inode_pages2_range(mapping,
- start >> PAGE_SHIFT,
- end >> PAGE_SHIFT);
- } while (ret == -EBUSY);
-
- return ret;
-}
-
-/* quotas */
-
-#ifdef CONFIG_BCACHEFS_QUOTA
-
-static void __bch2_quota_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res)
-{
- BUG_ON(res->sectors > inode->ei_quota_reserved);
-
- bch2_quota_acct(c, inode->ei_qid, Q_SPC,
- -((s64) res->sectors), KEY_TYPE_QUOTA_PREALLOC);
- inode->ei_quota_reserved -= res->sectors;
- res->sectors = 0;
-}
-
-static void bch2_quota_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res)
-{
- if (res->sectors) {
- mutex_lock(&inode->ei_quota_lock);
- __bch2_quota_reservation_put(c, inode, res);
- mutex_unlock(&inode->ei_quota_lock);
- }
-}
-
-static int bch2_quota_reservation_add(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res,
- u64 sectors,
- bool check_enospc)
-{
- int ret;
-
- if (test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags))
- return 0;
-
- mutex_lock(&inode->ei_quota_lock);
- ret = bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors,
- check_enospc ? KEY_TYPE_QUOTA_PREALLOC : KEY_TYPE_QUOTA_NOCHECK);
- if (likely(!ret)) {
- inode->ei_quota_reserved += sectors;
- res->sectors += sectors;
- }
- mutex_unlock(&inode->ei_quota_lock);
-
- return ret;
-}
-
-#else
-
-static void __bch2_quota_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res) {}
-
-static void bch2_quota_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res) {}
-
-static int bch2_quota_reservation_add(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res,
- unsigned sectors,
- bool check_enospc)
-{
- return 0;
-}
-
-#endif
-
-/* i_size updates: */
-
-struct inode_new_size {
- loff_t new_size;
- u64 now;
- unsigned fields;
-};
-
-static int inode_set_size(struct bch_inode_info *inode,
- struct bch_inode_unpacked *bi,
- void *p)
-{
- struct inode_new_size *s = p;
-
- bi->bi_size = s->new_size;
- if (s->fields & ATTR_ATIME)
- bi->bi_atime = s->now;
- if (s->fields & ATTR_MTIME)
- bi->bi_mtime = s->now;
- if (s->fields & ATTR_CTIME)
- bi->bi_ctime = s->now;
-
- return 0;
-}
-
-int __must_check bch2_write_inode_size(struct bch_fs *c,
- struct bch_inode_info *inode,
- loff_t new_size, unsigned fields)
-{
- struct inode_new_size s = {
- .new_size = new_size,
- .now = bch2_current_time(c),
- .fields = fields,
- };
-
- return bch2_write_inode(c, inode, inode_set_size, &s, fields);
-}
-
-static void __i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
- struct quota_res *quota_res, s64 sectors)
-{
- bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,
- "inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
- inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
- inode->ei_inode.bi_sectors);
- inode->v.i_blocks += sectors;
-
-#ifdef CONFIG_BCACHEFS_QUOTA
- if (quota_res &&
- !test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags) &&
- sectors > 0) {
- BUG_ON(sectors > quota_res->sectors);
- BUG_ON(sectors > inode->ei_quota_reserved);
-
- quota_res->sectors -= sectors;
- inode->ei_quota_reserved -= sectors;
- } else {
- bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors, KEY_TYPE_QUOTA_WARN);
- }
-#endif
-}
-
-static void i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
- struct quota_res *quota_res, s64 sectors)
-{
- if (sectors) {
- mutex_lock(&inode->ei_quota_lock);
- __i_sectors_acct(c, inode, quota_res, sectors);
- mutex_unlock(&inode->ei_quota_lock);
- }
-}
-
-/* page state: */
-
-/* stored in page->private: */
-
-#define BCH_FOLIO_SECTOR_STATE() \
- x(unallocated) \
- x(reserved) \
- x(dirty) \
- x(dirty_reserved) \
- x(allocated)
-
-enum bch_folio_sector_state {
-#define x(n) SECTOR_##n,
- BCH_FOLIO_SECTOR_STATE()
-#undef x
-};
-
-static const char * const bch2_folio_sector_states[] = {
-#define x(n) #n,
- BCH_FOLIO_SECTOR_STATE()
-#undef x
- NULL
-};
-
-static inline enum bch_folio_sector_state
-folio_sector_dirty(enum bch_folio_sector_state state)
-{
- switch (state) {
- case SECTOR_unallocated:
- return SECTOR_dirty;
- case SECTOR_reserved:
- return SECTOR_dirty_reserved;
- default:
- return state;
- }
-}
-
-static inline enum bch_folio_sector_state
-folio_sector_undirty(enum bch_folio_sector_state state)
-{
- switch (state) {
- case SECTOR_dirty:
- return SECTOR_unallocated;
- case SECTOR_dirty_reserved:
- return SECTOR_reserved;
- default:
- return state;
- }
-}
-
-static inline enum bch_folio_sector_state
-folio_sector_reserve(enum bch_folio_sector_state state)
-{
- switch (state) {
- case SECTOR_unallocated:
- return SECTOR_reserved;
- case SECTOR_dirty:
- return SECTOR_dirty_reserved;
- default:
- return state;
- }
-}
-
-struct bch_folio_sector {
- /* Uncompressed, fully allocated replicas (or on disk reservation): */
- unsigned nr_replicas:4;
-
- /* Owns PAGE_SECTORS * replicas_reserved sized in memory reservation: */
- unsigned replicas_reserved:4;
-
- /* i_sectors: */
- enum bch_folio_sector_state state:8;
-};
-
-struct bch_folio {
- spinlock_t lock;
- atomic_t write_count;
- /*
- * Is the sector state up to date with the btree?
- * (Not the data itself)
- */
- bool uptodate;
- struct bch_folio_sector s[];
-};
-
-static inline void folio_sector_set(struct folio *folio,
- struct bch_folio *s,
- unsigned i, unsigned n)
-{
- s->s[i].state = n;
-}
-
-/* file offset (to folio offset) to bch_folio_sector index */
-static inline int folio_pos_to_s(struct folio *folio, loff_t pos)
-{
- u64 f_offset = pos - folio_pos(folio);
- BUG_ON(pos < folio_pos(folio) || pos >= folio_end_pos(folio));
- return f_offset >> SECTOR_SHIFT;
-}
-
-static inline struct bch_folio *__bch2_folio(struct folio *folio)
-{
- return folio_has_private(folio)
- ? (struct bch_folio *) folio_get_private(folio)
- : NULL;
-}
-
-static inline struct bch_folio *bch2_folio(struct folio *folio)
-{
- EBUG_ON(!folio_test_locked(folio));
-
- return __bch2_folio(folio);
-}
-
-/* for newly allocated folios: */
-static void __bch2_folio_release(struct folio *folio)
-{
- kfree(folio_detach_private(folio));
-}
-
-static void bch2_folio_release(struct folio *folio)
-{
- EBUG_ON(!folio_test_locked(folio));
- __bch2_folio_release(folio);
-}
-
-/* for newly allocated folios: */
-static struct bch_folio *__bch2_folio_create(struct folio *folio, gfp_t gfp)
-{
- struct bch_folio *s;
-
- s = kzalloc(sizeof(*s) +
- sizeof(struct bch_folio_sector) *
- folio_sectors(folio), gfp);
- if (!s)
- return NULL;
-
- spin_lock_init(&s->lock);
- folio_attach_private(folio, s);
- return s;
-}
-
-static struct bch_folio *bch2_folio_create(struct folio *folio, gfp_t gfp)
-{
- return bch2_folio(folio) ?: __bch2_folio_create(folio, gfp);
-}
-
-static unsigned bkey_to_sector_state(struct bkey_s_c k)
-{
- if (bkey_extent_is_reservation(k))
- return SECTOR_reserved;
- if (bkey_extent_is_allocation(k.k))
- return SECTOR_allocated;
- return SECTOR_unallocated;
-}
-
-static void __bch2_folio_set(struct folio *folio,
- unsigned pg_offset, unsigned pg_len,
- unsigned nr_ptrs, unsigned state)
-{
- struct bch_folio *s = bch2_folio(folio);
- unsigned i, sectors = folio_sectors(folio);
-
- BUG_ON(pg_offset >= sectors);
- BUG_ON(pg_offset + pg_len > sectors);
-
- spin_lock(&s->lock);
-
- for (i = pg_offset; i < pg_offset + pg_len; i++) {
- s->s[i].nr_replicas = nr_ptrs;
- folio_sector_set(folio, s, i, state);
- }
-
- if (i == sectors)
- s->uptodate = true;
-
- spin_unlock(&s->lock);
-}
-
-/*
- * Initialize bch_folio state (allocated/unallocated, nr_replicas) from the
- * extents btree:
- */
-static int bch2_folio_set(struct bch_fs *c, subvol_inum inum,
- struct folio **folios, unsigned nr_folios)
-{
- struct btree_trans trans;
- struct btree_iter iter;
- struct bkey_s_c k;
- struct bch_folio *s;
- u64 offset = folio_sector(folios[0]);
- unsigned folio_idx;
- u32 snapshot;
- bool need_set = false;
- int ret;
-
- for (folio_idx = 0; folio_idx < nr_folios; folio_idx++) {
- s = bch2_folio_create(folios[folio_idx], GFP_KERNEL);
- if (!s)
- return -ENOMEM;
-
- need_set |= !s->uptodate;
- }
-
- if (!need_set)
- return 0;
-
- folio_idx = 0;
- bch2_trans_init(&trans, c, 0, 0);
-retry:
- bch2_trans_begin(&trans);
-
- ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
- if (ret)
- goto err;
-
- for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
- SPOS(inum.inum, offset, snapshot),
- BTREE_ITER_SLOTS, k, ret) {
- unsigned nr_ptrs = bch2_bkey_nr_ptrs_fully_allocated(k);
- unsigned state = bkey_to_sector_state(k);
-
- while (folio_idx < nr_folios) {
- struct folio *folio = folios[folio_idx];
- u64 folio_start = folio_sector(folio);
- u64 folio_end = folio_end_sector(folio);
- unsigned folio_offset = max(bkey_start_offset(k.k), folio_start) - folio_start;
- unsigned folio_len = min(k.k->p.offset, folio_end) - folio_offset - folio_start;
-
- BUG_ON(k.k->p.offset < folio_start);
- BUG_ON(bkey_start_offset(k.k) > folio_end);
-
- if (!bch2_folio(folio)->uptodate)
- __bch2_folio_set(folio, folio_offset, folio_len, nr_ptrs, state);
-
- if (k.k->p.offset < folio_end)
- break;
- folio_idx++;
- }
-
- if (folio_idx == nr_folios)
- break;
- }
-
- offset = iter.pos.offset;
- bch2_trans_iter_exit(&trans, &iter);
-err:
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- goto retry;
- bch2_trans_exit(&trans);
-
- return ret;
-}
-
-static void bch2_bio_page_state_set(struct bio *bio, struct bkey_s_c k)
-{
- struct bvec_iter iter;
- struct folio_vec fv;
- unsigned nr_ptrs = k.k->type == KEY_TYPE_reflink_v
- ? 0 : bch2_bkey_nr_ptrs_fully_allocated(k);
- unsigned state = bkey_to_sector_state(k);
-
- bio_for_each_folio(fv, bio, iter)
- __bch2_folio_set(fv.fv_folio,
- fv.fv_offset >> 9,
- fv.fv_len >> 9,
- nr_ptrs, state);
-}
-
-static void mark_pagecache_unallocated(struct bch_inode_info *inode,
- u64 start, u64 end)
-{
- pgoff_t index = start >> PAGE_SECTORS_SHIFT;
- pgoff_t end_index = (end - 1) >> PAGE_SECTORS_SHIFT;
- struct folio_batch fbatch;
- unsigned i, j;
-
- if (end <= start)
- return;
-
- folio_batch_init(&fbatch);
-
- while (filemap_get_folios(inode->v.i_mapping,
- &index, end_index, &fbatch)) {
- for (i = 0; i < folio_batch_count(&fbatch); i++) {
- struct folio *folio = fbatch.folios[i];
- u64 folio_start = folio_sector(folio);
- u64 folio_end = folio_end_sector(folio);
- unsigned folio_offset = max(start, folio_start) - folio_start;
- unsigned folio_len = min(end, folio_end) - folio_offset - folio_start;
- struct bch_folio *s;
-
- BUG_ON(end <= folio_start);
-
- folio_lock(folio);
- s = bch2_folio(folio);
-
- if (s) {
- spin_lock(&s->lock);
- for (j = folio_offset; j < folio_offset + folio_len; j++)
- s->s[j].nr_replicas = 0;
- spin_unlock(&s->lock);
- }
-
- folio_unlock(folio);
- }
- folio_batch_release(&fbatch);
- cond_resched();
- }
-}
-
-static void mark_pagecache_reserved(struct bch_inode_info *inode,
- u64 start, u64 end)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- pgoff_t index = start >> PAGE_SECTORS_SHIFT;
- pgoff_t end_index = (end - 1) >> PAGE_SECTORS_SHIFT;
- struct folio_batch fbatch;
- s64 i_sectors_delta = 0;
- unsigned i, j;
-
- if (end <= start)
- return;
-
- folio_batch_init(&fbatch);
-
- while (filemap_get_folios(inode->v.i_mapping,
- &index, end_index, &fbatch)) {
- for (i = 0; i < folio_batch_count(&fbatch); i++) {
- struct folio *folio = fbatch.folios[i];
- u64 folio_start = folio_sector(folio);
- u64 folio_end = folio_end_sector(folio);
- unsigned folio_offset = max(start, folio_start) - folio_start;
- unsigned folio_len = min(end, folio_end) - folio_offset - folio_start;
- struct bch_folio *s;
-
- BUG_ON(end <= folio_start);
-
- folio_lock(folio);
- s = bch2_folio(folio);
-
- if (s) {
- spin_lock(&s->lock);
- for (j = folio_offset; j < folio_offset + folio_len; j++) {
- i_sectors_delta -= s->s[j].state == SECTOR_dirty;
- folio_sector_set(folio, s, j, folio_sector_reserve(s->s[j].state));
- }
- spin_unlock(&s->lock);
- }
-
- folio_unlock(folio);
- }
- folio_batch_release(&fbatch);
- cond_resched();
- }
-
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
-}
-
-static inline unsigned inode_nr_replicas(struct bch_fs *c, struct bch_inode_info *inode)
-{
- /* XXX: this should not be open coded */
- return inode->ei_inode.bi_data_replicas
- ? inode->ei_inode.bi_data_replicas - 1
- : c->opts.data_replicas;
-}
-
-static inline unsigned sectors_to_reserve(struct bch_folio_sector *s,
- unsigned nr_replicas)
-{
- return max(0, (int) nr_replicas -
- s->nr_replicas -
- s->replicas_reserved);
-}
-
-static int bch2_get_folio_disk_reservation(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct folio *folio, bool check_enospc)
-{
- struct bch_folio *s = bch2_folio_create(folio, 0);
- unsigned nr_replicas = inode_nr_replicas(c, inode);
- struct disk_reservation disk_res = { 0 };
- unsigned i, sectors = folio_sectors(folio), disk_res_sectors = 0;
- int ret;
-
- if (!s)
- return -ENOMEM;
-
- for (i = 0; i < sectors; i++)
- disk_res_sectors += sectors_to_reserve(&s->s[i], nr_replicas);
-
- if (!disk_res_sectors)
- return 0;
-
- ret = bch2_disk_reservation_get(c, &disk_res,
- disk_res_sectors, 1,
- !check_enospc
- ? BCH_DISK_RESERVATION_NOFAIL
- : 0);
- if (unlikely(ret))
- return ret;
-
- for (i = 0; i < sectors; i++)
- s->s[i].replicas_reserved +=
- sectors_to_reserve(&s->s[i], nr_replicas);
-
- return 0;
-}
-
-struct bch2_folio_reservation {
- struct disk_reservation disk;
- struct quota_res quota;
-};
-
-static void bch2_folio_reservation_init(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct bch2_folio_reservation *res)
-{
- memset(res, 0, sizeof(*res));
-
- res->disk.nr_replicas = inode_nr_replicas(c, inode);
-}
-
-static void bch2_folio_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct bch2_folio_reservation *res)
-{
- bch2_disk_reservation_put(c, &res->disk);
- bch2_quota_reservation_put(c, inode, &res->quota);
-}
-
-static int bch2_folio_reservation_get(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct folio *folio,
- struct bch2_folio_reservation *res,
- unsigned offset, unsigned len)
-{
- struct bch_folio *s = bch2_folio_create(folio, 0);
- unsigned i, disk_sectors = 0, quota_sectors = 0;
- int ret;
-
- if (!s)
- return -ENOMEM;
-
- BUG_ON(!s->uptodate);
-
- for (i = round_down(offset, block_bytes(c)) >> 9;
- i < round_up(offset + len, block_bytes(c)) >> 9;
- i++) {
- disk_sectors += sectors_to_reserve(&s->s[i],
- res->disk.nr_replicas);
- quota_sectors += s->s[i].state == SECTOR_unallocated;
- }
-
- if (disk_sectors) {
- ret = bch2_disk_reservation_add(c, &res->disk, disk_sectors, 0);
- if (unlikely(ret))
- return ret;
- }
-
- if (quota_sectors) {
- ret = bch2_quota_reservation_add(c, inode, &res->quota,
- quota_sectors, true);
- if (unlikely(ret)) {
- struct disk_reservation tmp = {
- .sectors = disk_sectors
- };
-
- bch2_disk_reservation_put(c, &tmp);
- res->disk.sectors -= disk_sectors;
- return ret;
- }
- }
-
- return 0;
-}
-
-static void bch2_clear_folio_bits(struct folio *folio)
-{
- struct bch_inode_info *inode = to_bch_ei(folio->mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_folio *s = bch2_folio(folio);
- struct disk_reservation disk_res = { 0 };
- int i, sectors = folio_sectors(folio), dirty_sectors = 0;
-
- if (!s)
- return;
-
- EBUG_ON(!folio_test_locked(folio));
- EBUG_ON(folio_test_writeback(folio));
-
- for (i = 0; i < sectors; i++) {
- disk_res.sectors += s->s[i].replicas_reserved;
- s->s[i].replicas_reserved = 0;
-
- dirty_sectors -= s->s[i].state == SECTOR_dirty;
- folio_sector_set(folio, s, i, folio_sector_undirty(s->s[i].state));
- }
-
- bch2_disk_reservation_put(c, &disk_res);
-
- i_sectors_acct(c, inode, NULL, dirty_sectors);
-
- bch2_folio_release(folio);
-}
-
-static void bch2_set_folio_dirty(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct folio *folio,
- struct bch2_folio_reservation *res,
- unsigned offset, unsigned len)
-{
- struct bch_folio *s = bch2_folio(folio);
- unsigned i, dirty_sectors = 0;
-
- WARN_ON((u64) folio_pos(folio) + offset + len >
- round_up((u64) i_size_read(&inode->v), block_bytes(c)));
-
- BUG_ON(!s->uptodate);
-
- spin_lock(&s->lock);
-
- for (i = round_down(offset, block_bytes(c)) >> 9;
- i < round_up(offset + len, block_bytes(c)) >> 9;
- i++) {
- unsigned sectors = sectors_to_reserve(&s->s[i],
- res->disk.nr_replicas);
-
- /*
- * This can happen if we race with the error path in
- * bch2_writepage_io_done():
- */
- sectors = min_t(unsigned, sectors, res->disk.sectors);
-
- s->s[i].replicas_reserved += sectors;
- res->disk.sectors -= sectors;
-
- dirty_sectors += s->s[i].state == SECTOR_unallocated;
-
- folio_sector_set(folio, s, i, folio_sector_dirty(s->s[i].state));
- }
-
- spin_unlock(&s->lock);
-
- i_sectors_acct(c, inode, &res->quota, dirty_sectors);
-
- if (!folio_test_dirty(folio))
- filemap_dirty_folio(inode->v.i_mapping, folio);
-}
-
-vm_fault_t bch2_page_fault(struct vm_fault *vmf)
-{
- struct file *file = vmf->vma->vm_file;
- struct address_space *mapping = file->f_mapping;
- struct address_space *fdm = faults_disabled_mapping();
- struct bch_inode_info *inode = file_bch_inode(file);
- vm_fault_t ret;
-
- if (fdm == mapping)
- return VM_FAULT_SIGBUS;
-
- /* Lock ordering: */
- if (fdm > mapping) {
- struct bch_inode_info *fdm_host = to_bch_ei(fdm->host);
-
- if (bch2_pagecache_add_tryget(inode))
- goto got_lock;
-
- bch2_pagecache_block_put(fdm_host);
-
- bch2_pagecache_add_get(inode);
- bch2_pagecache_add_put(inode);
-
- bch2_pagecache_block_get(fdm_host);
-
- /* Signal that lock has been dropped: */
- set_fdm_dropped_locks();
- return VM_FAULT_SIGBUS;
- }
-
- bch2_pagecache_add_get(inode);
-got_lock:
- ret = filemap_fault(vmf);
- bch2_pagecache_add_put(inode);
-
- return ret;
-}
-
-vm_fault_t bch2_page_mkwrite(struct vm_fault *vmf)
-{
- struct folio *folio = page_folio(vmf->page);
- struct file *file = vmf->vma->vm_file;
- struct bch_inode_info *inode = file_bch_inode(file);
- struct address_space *mapping = file->f_mapping;
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch2_folio_reservation res;
- unsigned len;
- loff_t isize;
- vm_fault_t ret;
-
- bch2_folio_reservation_init(c, inode, &res);
-
- sb_start_pagefault(inode->v.i_sb);
- file_update_time(file);
-
- /*
- * Not strictly necessary, but helps avoid dio writes livelocking in
- * write_invalidate_inode_pages_range() - can drop this if/when we get
- * a write_invalidate_inode_pages_range() that works without dropping
- * page lock before invalidating page
- */
- bch2_pagecache_add_get(inode);
-
- folio_lock(folio);
- isize = i_size_read(&inode->v);
-
- if (folio->mapping != mapping || folio_pos(folio) >= isize) {
- folio_unlock(folio);
- ret = VM_FAULT_NOPAGE;
- goto out;
- }
-
- len = min_t(loff_t, folio_size(folio), isize - folio_pos(folio));
-
- if (bch2_folio_set(c, inode_inum(inode), &folio, 1) ?:
- bch2_folio_reservation_get(c, inode, folio, &res, 0, len)) {
- folio_unlock(folio);
- ret = VM_FAULT_SIGBUS;
- goto out;
- }
-
- bch2_set_folio_dirty(c, inode, folio, &res, 0, len);
- bch2_folio_reservation_put(c, inode, &res);
-
- folio_wait_stable(folio);
- ret = VM_FAULT_LOCKED;
-out:
- bch2_pagecache_add_put(inode);
- sb_end_pagefault(inode->v.i_sb);
-
- return ret;
-}
-
-void bch2_invalidate_folio(struct folio *folio, size_t offset, size_t length)
-{
- if (offset || length < folio_size(folio))
- return;
-
- bch2_clear_folio_bits(folio);
-}
-
-bool bch2_release_folio(struct folio *folio, gfp_t gfp_mask)
-{
- if (folio_test_dirty(folio) || folio_test_writeback(folio))
- return false;
-
- bch2_clear_folio_bits(folio);
- return true;
-}
-
-/* readpage(s): */
-
-static void bch2_readpages_end_io(struct bio *bio)
-{
- struct folio_iter fi;
-
- bio_for_each_folio_all(fi, bio) {
- if (!bio->bi_status) {
- folio_mark_uptodate(fi.folio);
- } else {
- folio_clear_uptodate(fi.folio);
- folio_set_error(fi.folio);
- }
- folio_unlock(fi.folio);
- }
-
- bio_put(bio);
-}
-
-struct readpages_iter {
- struct address_space *mapping;
- unsigned idx;
- folios folios;
-};
-
-static int readpages_iter_init(struct readpages_iter *iter,
- struct readahead_control *ractl)
-{
- struct folio **fi;
- int ret;
-
- memset(iter, 0, sizeof(*iter));
-
- iter->mapping = ractl->mapping;
-
- ret = filemap_get_contig_folios_d(iter->mapping,
- ractl->_index << PAGE_SHIFT,
- (ractl->_index + ractl->_nr_pages) << PAGE_SHIFT,
- 0, mapping_gfp_mask(iter->mapping),
- &iter->folios);
- if (ret)
- return ret;
-
- darray_for_each(iter->folios, fi) {
- ractl->_nr_pages -= 1U << folio_order(*fi);
- __bch2_folio_create(*fi, __GFP_NOFAIL|GFP_KERNEL);
- folio_put(*fi);
- folio_put(*fi);
- }
-
- return 0;
-}
-
-static inline struct folio *readpage_iter_peek(struct readpages_iter *iter)
-{
- if (iter->idx >= iter->folios.nr)
- return NULL;
- return iter->folios.data[iter->idx];
-}
-
-static inline void readpage_iter_advance(struct readpages_iter *iter)
-{
- iter->idx++;
-}
-
-static bool extent_partial_reads_expensive(struct bkey_s_c k)
-{
- struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
- struct bch_extent_crc_unpacked crc;
- const union bch_extent_entry *i;
-
- bkey_for_each_crc(k.k, ptrs, crc, i)
- if (crc.csum_type || crc.compression_type)
- return true;
- return false;
-}
-
-static int readpage_bio_extend(struct btree_trans *trans,
- struct readpages_iter *iter,
- struct bio *bio,
- unsigned sectors_this_extent,
- bool get_more)
-{
- /* Don't hold btree locks while allocating memory: */
- bch2_trans_unlock(trans);
-
- while (bio_sectors(bio) < sectors_this_extent &&
- bio->bi_vcnt < bio->bi_max_vecs) {
- struct folio *folio = readpage_iter_peek(iter);
- int ret;
-
- if (folio) {
- readpage_iter_advance(iter);
- } else {
- pgoff_t folio_offset = bio_end_sector(bio) >> PAGE_SECTORS_SHIFT;
-
- if (!get_more)
- break;
-
- folio = xa_load(&iter->mapping->i_pages, folio_offset);
- if (folio && !xa_is_value(folio))
- break;
-
- folio = filemap_alloc_folio(readahead_gfp_mask(iter->mapping), 0);
- if (!folio)
- break;
-
- if (!__bch2_folio_create(folio, GFP_KERNEL)) {
- folio_put(folio);
- break;
- }
-
- ret = filemap_add_folio(iter->mapping, folio, folio_offset, GFP_KERNEL);
- if (ret) {
- __bch2_folio_release(folio);
- folio_put(folio);
- break;
- }
-
- folio_put(folio);
- }
-
- BUG_ON(folio_sector(folio) != bio_end_sector(bio));
-
- BUG_ON(!bio_add_folio(bio, folio, folio_size(folio), 0));
- }
-
- return bch2_trans_relock(trans);
-}
-
-static void bchfs_read(struct btree_trans *trans,
- struct bch_read_bio *rbio,
- subvol_inum inum,
- struct readpages_iter *readpages_iter)
-{
- struct bch_fs *c = trans->c;
- struct btree_iter iter;
- struct bkey_buf sk;
- int flags = BCH_READ_RETRY_IF_STALE|
- BCH_READ_MAY_PROMOTE;
- u32 snapshot;
- int ret = 0;
-
- rbio->c = c;
- rbio->start_time = local_clock();
- rbio->subvol = inum.subvol;
-
- bch2_bkey_buf_init(&sk);
-retry:
- bch2_trans_begin(trans);
- iter = (struct btree_iter) { NULL };
-
- ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
- if (ret)
- goto err;
-
- bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
- SPOS(inum.inum, rbio->bio.bi_iter.bi_sector, snapshot),
- BTREE_ITER_SLOTS);
- while (1) {
- struct bkey_s_c k;
- unsigned bytes, sectors, offset_into_extent;
- enum btree_id data_btree = BTREE_ID_extents;
-
- /*
- * read_extent -> io_time_reset may cause a transaction restart
- * without returning an error, we need to check for that here:
- */
- ret = bch2_trans_relock(trans);
- if (ret)
- break;
-
- bch2_btree_iter_set_pos(&iter,
- POS(inum.inum, rbio->bio.bi_iter.bi_sector));
-
- k = bch2_btree_iter_peek_slot(&iter);
- ret = bkey_err(k);
- if (ret)
- break;
-
- offset_into_extent = iter.pos.offset -
- bkey_start_offset(k.k);
- sectors = k.k->size - offset_into_extent;
-
- bch2_bkey_buf_reassemble(&sk, c, k);
-
- ret = bch2_read_indirect_extent(trans, &data_btree,
- &offset_into_extent, &sk);
- if (ret)
- break;
-
- k = bkey_i_to_s_c(sk.k);
-
- sectors = min(sectors, k.k->size - offset_into_extent);
-
- if (readpages_iter) {
- ret = readpage_bio_extend(trans, readpages_iter, &rbio->bio, sectors,
- extent_partial_reads_expensive(k));
- if (ret)
- break;
- }
-
- bytes = min(sectors, bio_sectors(&rbio->bio)) << 9;
- swap(rbio->bio.bi_iter.bi_size, bytes);
-
- if (rbio->bio.bi_iter.bi_size == bytes)
- flags |= BCH_READ_LAST_FRAGMENT;
-
- bch2_bio_page_state_set(&rbio->bio, k);
-
- bch2_read_extent(trans, rbio, iter.pos,
- data_btree, k, offset_into_extent, flags);
-
- if (flags & BCH_READ_LAST_FRAGMENT)
- break;
-
- swap(rbio->bio.bi_iter.bi_size, bytes);
- bio_advance(&rbio->bio, bytes);
-
- ret = btree_trans_too_many_iters(trans);
- if (ret)
- break;
- }
-err:
- bch2_trans_iter_exit(trans, &iter);
-
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- goto retry;
-
- if (ret) {
- bch_err_inum_offset_ratelimited(c,
- iter.pos.inode,
- iter.pos.offset << 9,
- "read error %i from btree lookup", ret);
- rbio->bio.bi_status = BLK_STS_IOERR;
- bio_endio(&rbio->bio);
- }
-
- bch2_bkey_buf_exit(&sk, c);
-}
-
-void bch2_readahead(struct readahead_control *ractl)
-{
- struct bch_inode_info *inode = to_bch_ei(ractl->mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_io_opts opts;
- struct btree_trans trans;
- struct folio *folio;
- struct readpages_iter readpages_iter;
- int ret;
-
- bch2_inode_opts_get(&opts, c, &inode->ei_inode);
-
- ret = readpages_iter_init(&readpages_iter, ractl);
- BUG_ON(ret);
-
- bch2_trans_init(&trans, c, 0, 0);
-
- bch2_pagecache_add_get(inode);
-
- while ((folio = readpage_iter_peek(&readpages_iter))) {
- unsigned n = min_t(unsigned,
- readpages_iter.folios.nr -
- readpages_iter.idx,
- BIO_MAX_VECS);
- struct bch_read_bio *rbio =
- rbio_init(bio_alloc_bioset(NULL, n, REQ_OP_READ,
- GFP_KERNEL, &c->bio_read),
- opts);
-
- readpage_iter_advance(&readpages_iter);
-
- rbio->bio.bi_iter.bi_sector = folio_sector(folio);
- rbio->bio.bi_end_io = bch2_readpages_end_io;
- BUG_ON(!bio_add_folio(&rbio->bio, folio, folio_size(folio), 0));
-
- bchfs_read(&trans, rbio, inode_inum(inode),
- &readpages_iter);
- bch2_trans_unlock(&trans);
- }
-
- bch2_pagecache_add_put(inode);
-
- bch2_trans_exit(&trans);
- darray_exit(&readpages_iter.folios);
-}
-
-static void __bchfs_readfolio(struct bch_fs *c, struct bch_read_bio *rbio,
- subvol_inum inum, struct folio *folio)
-{
- struct btree_trans trans;
-
- bch2_folio_create(folio, __GFP_NOFAIL);
-
- rbio->bio.bi_opf = REQ_OP_READ|REQ_SYNC;
- rbio->bio.bi_iter.bi_sector = folio_sector(folio);
- BUG_ON(!bio_add_folio(&rbio->bio, folio, folio_size(folio), 0));
-
- bch2_trans_init(&trans, c, 0, 0);
- bchfs_read(&trans, rbio, inum, NULL);
- bch2_trans_exit(&trans);
-}
-
-static void bch2_read_single_folio_end_io(struct bio *bio)
-{
- complete(bio->bi_private);
-}
-
-static int bch2_read_single_folio(struct folio *folio,
- struct address_space *mapping)
-{
- struct bch_inode_info *inode = to_bch_ei(mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_read_bio *rbio;
- struct bch_io_opts opts;
- int ret;
- DECLARE_COMPLETION_ONSTACK(done);
-
- bch2_inode_opts_get(&opts, c, &inode->ei_inode);
-
- rbio = rbio_init(bio_alloc_bioset(NULL, 1, REQ_OP_READ, GFP_KERNEL, &c->bio_read),
- opts);
- rbio->bio.bi_private = &done;
- rbio->bio.bi_end_io = bch2_read_single_folio_end_io;
-
- __bchfs_readfolio(c, rbio, inode_inum(inode), folio);
- wait_for_completion(&done);
-
- ret = blk_status_to_errno(rbio->bio.bi_status);
- bio_put(&rbio->bio);
-
- if (ret < 0)
- return ret;
-
- folio_mark_uptodate(folio);
- return 0;
-}
-
-int bch2_read_folio(struct file *file, struct folio *folio)
-{
- int ret;
-
- ret = bch2_read_single_folio(folio, folio->mapping);
- folio_unlock(folio);
- return bch2_err_class(ret);
-}
-
-/* writepages: */
-
-struct bch_writepage_state {
- struct bch_writepage_io *io;
- struct bch_io_opts opts;
- struct bch_folio_sector *tmp;
- unsigned tmp_sectors;
-};
-
-static inline struct bch_writepage_state bch_writepage_state_init(struct bch_fs *c,
- struct bch_inode_info *inode)
-{
- struct bch_writepage_state ret = { 0 };
-
- bch2_inode_opts_get(&ret.opts, c, &inode->ei_inode);
- return ret;
-}
-
-static void bch2_writepage_io_done(struct bch_write_op *op)
-{
- struct bch_writepage_io *io =
- container_of(op, struct bch_writepage_io, op);
- struct bch_fs *c = io->op.c;
- struct bio *bio = &io->op.wbio.bio;
- struct folio_iter fi;
- unsigned i;
-
- if (io->op.error) {
- set_bit(EI_INODE_ERROR, &io->inode->ei_flags);
-
- bio_for_each_folio_all(fi, bio) {
- struct bch_folio *s;
-
- folio_set_error(fi.folio);
- mapping_set_error(fi.folio->mapping, -EIO);
-
- s = __bch2_folio(fi.folio);
- spin_lock(&s->lock);
- for (i = 0; i < folio_sectors(fi.folio); i++)
- s->s[i].nr_replicas = 0;
- spin_unlock(&s->lock);
- }
- }
-
- if (io->op.flags & BCH_WRITE_WROTE_DATA_INLINE) {
- bio_for_each_folio_all(fi, bio) {
- struct bch_folio *s;
-
- s = __bch2_folio(fi.folio);
- spin_lock(&s->lock);
- for (i = 0; i < folio_sectors(fi.folio); i++)
- s->s[i].nr_replicas = 0;
- spin_unlock(&s->lock);
- }
- }
-
- /*
- * racing with fallocate can cause us to add fewer sectors than
- * expected - but we shouldn't add more sectors than expected:
- */
- WARN_ON_ONCE(io->op.i_sectors_delta > 0);
-
- /*
- * (error (due to going RO) halfway through a page can screw that up
- * slightly)
- * XXX wtf?
- BUG_ON(io->op.op.i_sectors_delta >= PAGE_SECTORS);
- */
-
- /*
- * PageWriteback is effectively our ref on the inode - fixup i_blocks
- * before calling end_page_writeback:
- */
- i_sectors_acct(c, io->inode, NULL, io->op.i_sectors_delta);
-
- bio_for_each_folio_all(fi, bio) {
- struct bch_folio *s = __bch2_folio(fi.folio);
-
- if (atomic_dec_and_test(&s->write_count))
- folio_end_writeback(fi.folio);
- }
-
- bio_put(&io->op.wbio.bio);
-}
-
-static void bch2_writepage_do_io(struct bch_writepage_state *w)
-{
- struct bch_writepage_io *io = w->io;
-
- w->io = NULL;
- closure_call(&io->op.cl, bch2_write, NULL, NULL);
-}
-
-/*
- * Get a bch_writepage_io and add @page to it - appending to an existing one if
- * possible, else allocating a new one:
- */
-static void bch2_writepage_io_alloc(struct bch_fs *c,
- struct writeback_control *wbc,
- struct bch_writepage_state *w,
- struct bch_inode_info *inode,
- u64 sector,
- unsigned nr_replicas)
-{
- struct bch_write_op *op;
-
- w->io = container_of(bio_alloc_bioset(NULL, BIO_MAX_VECS,
- REQ_OP_WRITE,
- GFP_KERNEL,
- &c->writepage_bioset),
- struct bch_writepage_io, op.wbio.bio);
-
- w->io->inode = inode;
- op = &w->io->op;
- bch2_write_op_init(op, c, w->opts);
- op->target = w->opts.foreground_target;
- op->nr_replicas = nr_replicas;
- op->res.nr_replicas = nr_replicas;
- op->write_point = writepoint_hashed(inode->ei_last_dirtied);
- op->subvol = inode->ei_subvol;
- op->pos = POS(inode->v.i_ino, sector);
- op->end_io = bch2_writepage_io_done;
- op->devs_need_flush = &inode->ei_devs_need_flush;
- op->wbio.bio.bi_iter.bi_sector = sector;
- op->wbio.bio.bi_opf = wbc_to_write_flags(wbc);
-}
-
-static int __bch2_writepage(struct folio *folio,
- struct writeback_control *wbc,
- void *data)
-{
- struct bch_inode_info *inode = to_bch_ei(folio->mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_writepage_state *w = data;
- struct bch_folio *s;
- unsigned i, offset, f_sectors, nr_replicas_this_write = U32_MAX;
- loff_t i_size = i_size_read(&inode->v);
- int ret;
-
- EBUG_ON(!folio_test_uptodate(folio));
-
- /* Is the folio fully inside i_size? */
- if (folio_end_pos(folio) <= i_size)
- goto do_io;
-
- /* Is the folio fully outside i_size? (truncate in progress) */
- if (folio_pos(folio) >= i_size) {
- folio_unlock(folio);
- return 0;
- }
-
- /*
- * The folio straddles i_size. It must be zeroed out on each and every
- * writepage invocation because it may be mmapped. "A file is mapped
- * in multiples of the folio size. For a file that is not a multiple of
- * the folio size, the remaining memory is zeroed when mapped, and
- * writes to that region are not written out to the file."
- */
- folio_zero_segment(folio,
- i_size - folio_pos(folio),
- folio_size(folio));
-do_io:
- f_sectors = folio_sectors(folio);
- s = bch2_folio(folio);
-
- if (f_sectors > w->tmp_sectors) {
- kfree(w->tmp);
- w->tmp = kzalloc(sizeof(struct bch_folio_sector) *
- f_sectors, __GFP_NOFAIL);
- w->tmp_sectors = f_sectors;
- }
-
- /*
- * Things get really hairy with errors during writeback:
- */
- ret = bch2_get_folio_disk_reservation(c, inode, folio, false);
- BUG_ON(ret);
-
- /* Before unlocking the page, get copy of reservations: */
- spin_lock(&s->lock);
- memcpy(w->tmp, s->s, sizeof(struct bch_folio_sector) * f_sectors);
-
- for (i = 0; i < f_sectors; i++) {
- if (s->s[i].state < SECTOR_dirty)
- continue;
-
- nr_replicas_this_write =
- min_t(unsigned, nr_replicas_this_write,
- s->s[i].nr_replicas +
- s->s[i].replicas_reserved);
- }
-
- for (i = 0; i < f_sectors; i++) {
- if (s->s[i].state < SECTOR_dirty)
- continue;
-
- s->s[i].nr_replicas = w->opts.compression
- ? 0 : nr_replicas_this_write;
-
- s->s[i].replicas_reserved = 0;
- folio_sector_set(folio, s, i, SECTOR_allocated);
- }
- spin_unlock(&s->lock);
-
- BUG_ON(atomic_read(&s->write_count));
- atomic_set(&s->write_count, 1);
-
- BUG_ON(folio_test_writeback(folio));
- folio_start_writeback(folio);
-
- folio_unlock(folio);
-
- offset = 0;
- while (1) {
- unsigned sectors = 0, dirty_sectors = 0, reserved_sectors = 0;
- u64 sector;
-
- while (offset < f_sectors &&
- w->tmp[offset].state < SECTOR_dirty)
- offset++;
-
- if (offset == f_sectors)
- break;
-
- while (offset + sectors < f_sectors &&
- w->tmp[offset + sectors].state >= SECTOR_dirty) {
- reserved_sectors += w->tmp[offset + sectors].replicas_reserved;
- dirty_sectors += w->tmp[offset + sectors].state == SECTOR_dirty;
- sectors++;
- }
- BUG_ON(!sectors);
-
- sector = folio_sector(folio) + offset;
-
- if (w->io &&
- (w->io->op.res.nr_replicas != nr_replicas_this_write ||
- bio_full(&w->io->op.wbio.bio, sectors << 9) ||
- w->io->op.wbio.bio.bi_iter.bi_size + (sectors << 9) >=
- (BIO_MAX_VECS * PAGE_SIZE) ||
- bio_end_sector(&w->io->op.wbio.bio) != sector))
- bch2_writepage_do_io(w);
-
- if (!w->io)
- bch2_writepage_io_alloc(c, wbc, w, inode, sector,
- nr_replicas_this_write);
-
- atomic_inc(&s->write_count);
-
- BUG_ON(inode != w->io->inode);
- BUG_ON(!bio_add_folio(&w->io->op.wbio.bio, folio,
- sectors << 9, offset << 9));
-
- /* Check for writing past i_size: */
- WARN_ONCE((bio_end_sector(&w->io->op.wbio.bio) << 9) >
- round_up(i_size, block_bytes(c)) &&
- !test_bit(BCH_FS_EMERGENCY_RO, &c->flags),
- "writing past i_size: %llu > %llu (unrounded %llu)\n",
- bio_end_sector(&w->io->op.wbio.bio) << 9,
- round_up(i_size, block_bytes(c)),
- i_size);
-
- w->io->op.res.sectors += reserved_sectors;
- w->io->op.i_sectors_delta -= dirty_sectors;
- w->io->op.new_i_size = i_size;
-
- offset += sectors;
- }
-
- if (atomic_dec_and_test(&s->write_count))
- folio_end_writeback(folio);
-
- return 0;
-}
-
-int bch2_writepages(struct address_space *mapping, struct writeback_control *wbc)
-{
- struct bch_fs *c = mapping->host->i_sb->s_fs_info;
- struct bch_writepage_state w =
- bch_writepage_state_init(c, to_bch_ei(mapping->host));
- struct blk_plug plug;
- int ret;
-
- blk_start_plug(&plug);
- ret = write_cache_pages(mapping, wbc, __bch2_writepage, &w);
- if (w.io)
- bch2_writepage_do_io(&w);
- blk_finish_plug(&plug);
- kfree(w.tmp);
- return bch2_err_class(ret);
-}
-
-/* buffered writes: */
-
-int bch2_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len,
- struct page **pagep, void **fsdata)
-{
- struct bch_inode_info *inode = to_bch_ei(mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch2_folio_reservation *res;
- struct folio *folio;
- unsigned offset;
- int ret = -ENOMEM;
-
- res = kmalloc(sizeof(*res), GFP_KERNEL);
- if (!res)
- return -ENOMEM;
-
- bch2_folio_reservation_init(c, inode, res);
- *fsdata = res;
-
- bch2_pagecache_add_get(inode);
-
- folio = __filemap_get_folio(mapping, pos >> PAGE_SHIFT,
- FGP_LOCK|FGP_WRITE|FGP_CREAT|FGP_STABLE,
- mapping_gfp_mask(mapping));
- if (IS_ERR_OR_NULL(folio))
- goto err_unlock;
-
- if (folio_test_uptodate(folio))
- goto out;
-
- offset = pos - folio_pos(folio);
- len = min_t(size_t, len, folio_end_pos(folio) - pos);
-
- /* If we're writing entire folio, don't need to read it in first: */
- if (!offset && len == folio_size(folio))
- goto out;
-
- if (!offset && pos + len >= inode->v.i_size) {
- folio_zero_segment(folio, len, folio_size(folio));
- flush_dcache_folio(folio);
- goto out;
- }
-
- if (folio_pos(folio) >= inode->v.i_size) {
- folio_zero_segments(folio, 0, offset, offset + len, folio_size(folio));
- flush_dcache_folio(folio);
- goto out;
- }
-readpage:
- ret = bch2_read_single_folio(folio, mapping);
- if (ret)
- goto err;
-out:
- ret = bch2_folio_set(c, inode_inum(inode), &folio, 1);
- if (ret)
- goto err;
-
- ret = bch2_folio_reservation_get(c, inode, folio, res, offset, len);
- if (ret) {
- if (!folio_test_uptodate(folio)) {
- /*
- * If the folio hasn't been read in, we won't know if we
- * actually need a reservation - we don't actually need
- * to read here, we just need to check if the folio is
- * fully backed by uncompressed data:
- */
- goto readpage;
- }
-
- goto err;
- }
-
- *pagep = &folio->page;
- return 0;
-err:
- folio_unlock(folio);
- folio_put(folio);
- *pagep = NULL;
-err_unlock:
- bch2_pagecache_add_put(inode);
- kfree(res);
- *fsdata = NULL;
- return bch2_err_class(ret);
-}
-
-int bch2_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
-{
- struct bch_inode_info *inode = to_bch_ei(mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch2_folio_reservation *res = fsdata;
- struct folio *folio = page_folio(page);
- unsigned offset = pos - folio_pos(folio);
-
- lockdep_assert_held(&inode->v.i_rwsem);
- BUG_ON(offset + copied > folio_size(folio));
-
- if (unlikely(copied < len && !folio_test_uptodate(folio))) {
- /*
- * The folio needs to be read in, but that would destroy
- * our partial write - simplest thing is to just force
- * userspace to redo the write:
- */
- folio_zero_range(folio, 0, folio_size(folio));
- flush_dcache_folio(folio);
- copied = 0;
- }
-
- spin_lock(&inode->v.i_lock);
- if (pos + copied > inode->v.i_size)
- i_size_write(&inode->v, pos + copied);
- spin_unlock(&inode->v.i_lock);
-
- if (copied) {
- if (!folio_test_uptodate(folio))
- folio_mark_uptodate(folio);
-
- bch2_set_folio_dirty(c, inode, folio, res, offset, copied);
-
- inode->ei_last_dirtied = (unsigned long) current;
- }
-
- folio_unlock(folio);
- folio_put(folio);
- bch2_pagecache_add_put(inode);
-
- bch2_folio_reservation_put(c, inode, res);
- kfree(res);
-
- return copied;
-}
-
-static noinline void folios_trunc(folios *folios, struct folio **fi)
-{
- while (folios->data + folios->nr > fi) {
- struct folio *f = darray_pop(folios);
-
- folio_unlock(f);
- folio_put(f);
- }
-}
-
-static int __bch2_buffered_write(struct bch_inode_info *inode,
- struct address_space *mapping,
- struct iov_iter *iter,
- loff_t pos, unsigned len)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch2_folio_reservation res;
- folios folios;
- struct folio **fi, *f;
- unsigned copied = 0, f_offset;
- u64 end = pos + len, f_pos;
- loff_t last_folio_pos = inode->v.i_size;
- int ret = 0;
-
- BUG_ON(!len);
-
- bch2_folio_reservation_init(c, inode, &res);
- darray_init(&folios);
-
- ret = filemap_get_contig_folios_d(mapping, pos, end,
- FGP_LOCK|FGP_WRITE|FGP_STABLE|FGP_CREAT,
- mapping_gfp_mask(mapping),
- &folios);
- if (ret)
- goto out;
-
- BUG_ON(!folios.nr);
-
- f = darray_first(folios);
- if (pos != folio_pos(f) && !folio_test_uptodate(f)) {
- ret = bch2_read_single_folio(f, mapping);
- if (ret)
- goto out;
- }
-
- f = darray_last(folios);
- end = min(end, folio_end_pos(f));
- last_folio_pos = folio_pos(f);
- if (end != folio_end_pos(f) && !folio_test_uptodate(f)) {
- if (end >= inode->v.i_size) {
- folio_zero_range(f, 0, folio_size(f));
- } else {
- ret = bch2_read_single_folio(f, mapping);
- if (ret)
- goto out;
- }
- }
-
- ret = bch2_folio_set(c, inode_inum(inode), folios.data, folios.nr);
- if (ret)
- goto out;
-
- f_pos = pos;
- f_offset = pos - folio_pos(darray_first(folios));
- darray_for_each(folios, fi) {
- struct folio *f = *fi;
- u64 f_len = min(end, folio_end_pos(f)) - f_pos;
-
- /*
- * XXX: per POSIX and fstests generic/275, on -ENOSPC we're
- * supposed to write as much as we have disk space for.
- *
- * On failure here we should still write out a partial page if
- * we aren't completely out of disk space - we don't do that
- * yet:
- */
- ret = bch2_folio_reservation_get(c, inode, f, &res, f_offset, f_len);
- if (unlikely(ret)) {
- folios_trunc(&folios, fi);
- if (!folios.nr)
- goto out;
-
- end = min(end, folio_end_pos(darray_last(folios)));
- break;
- }
-
- f_pos = folio_end_pos(f);
- f_offset = 0;
- }
-
- if (mapping_writably_mapped(mapping))
- darray_for_each(folios, fi)
- flush_dcache_folio(*fi);
-
- f_pos = pos;
- f_offset = pos - folio_pos(darray_first(folios));
- darray_for_each(folios, fi) {
- struct folio *f = *fi;
- u64 f_len = min(end, folio_end_pos(f)) - f_pos;
- unsigned f_copied = copy_page_from_iter_atomic(&f->page, f_offset, f_len, iter);
-
- if (!f_copied) {
- folios_trunc(&folios, fi);
- break;
- }
-
- if (!folio_test_uptodate(f) &&
- f_copied != folio_size(f) &&
- pos + copied + f_copied < inode->v.i_size) {
- folio_zero_range(f, 0, folio_size(f));
- folios_trunc(&folios, fi);
- break;
- }
-
- flush_dcache_folio(f);
- copied += f_copied;
-
- if (f_copied != f_len) {
- folios_trunc(&folios, fi + 1);
- break;
- }
-
- f_pos = folio_end_pos(f);
- f_offset = 0;
- }
-
- if (!copied)
- goto out;
-
- end = pos + copied;
-
- spin_lock(&inode->v.i_lock);
- if (end > inode->v.i_size)
- i_size_write(&inode->v, end);
- spin_unlock(&inode->v.i_lock);
-
- f_pos = pos;
- f_offset = pos - folio_pos(darray_first(folios));
- darray_for_each(folios, fi) {
- struct folio *f = *fi;
- u64 f_len = min(end, folio_end_pos(f)) - f_pos;
-
- if (!folio_test_uptodate(f))
- folio_mark_uptodate(f);
-
- bch2_set_folio_dirty(c, inode, f, &res, f_offset, f_len);
-
- f_pos = folio_end_pos(f);
- f_offset = 0;
- }
-
- inode->ei_last_dirtied = (unsigned long) current;
-out:
- darray_for_each(folios, fi) {
- folio_unlock(*fi);
- folio_put(*fi);
- }
-
- /*
- * If the last folio added to the mapping starts beyond current EOF, we
- * performed a short write but left around at least one post-EOF folio.
- * Clean up the mapping before we return.
- */
- if (last_folio_pos >= inode->v.i_size)
- truncate_pagecache(&inode->v, inode->v.i_size);
-
- darray_exit(&folios);
- bch2_folio_reservation_put(c, inode, &res);
-
- return copied ?: ret;
-}
-
-static ssize_t bch2_buffered_write(struct kiocb *iocb, struct iov_iter *iter)
-{
- struct file *file = iocb->ki_filp;
- struct address_space *mapping = file->f_mapping;
- struct bch_inode_info *inode = file_bch_inode(file);
- loff_t pos = iocb->ki_pos;
- ssize_t written = 0;
- int ret = 0;
-
- bch2_pagecache_add_get(inode);
-
- do {
- unsigned offset = pos & (PAGE_SIZE - 1);
- unsigned bytes = iov_iter_count(iter);
-again:
- /*
- * Bring in the user page that we will copy from _first_.
- * Otherwise there's a nasty deadlock on copying from the
- * same page as we're writing to, without it being marked
- * up-to-date.
- *
- * Not only is this an optimisation, but it is also required
- * to check that the address is actually valid, when atomic
- * usercopies are used, below.
- */
- if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
- bytes = min_t(unsigned long, iov_iter_count(iter),
- PAGE_SIZE - offset);
-
- if (unlikely(fault_in_iov_iter_readable(iter, bytes))) {
- ret = -EFAULT;
- break;
- }
- }
-
- if (unlikely(fatal_signal_pending(current))) {
- ret = -EINTR;
- break;
- }
-
- ret = __bch2_buffered_write(inode, mapping, iter, pos, bytes);
- if (unlikely(ret < 0))
- break;
-
- cond_resched();
-
- if (unlikely(ret == 0)) {
- /*
- * If we were unable to copy any data at all, we must
- * fall back to a single segment length write.
- *
- * If we didn't fallback here, we could livelock
- * because not all segments in the iov can be copied at
- * once without a pagefault.
- */
- bytes = min_t(unsigned long, PAGE_SIZE - offset,
- iov_iter_single_seg_count(iter));
- goto again;
- }
- pos += ret;
- written += ret;
- ret = 0;
-
- balance_dirty_pages_ratelimited(mapping);
- } while (iov_iter_count(iter));
-
- bch2_pagecache_add_put(inode);
-
- return written ? written : ret;
-}
-
-/* O_DIRECT reads */
-
-static void bio_check_or_release(struct bio *bio, bool check_dirty)
-{
- if (check_dirty) {
- bio_check_pages_dirty(bio);
- } else {
- bio_release_pages(bio, false);
- bio_put(bio);
- }
-}
-
-static void bch2_dio_read_complete(struct closure *cl)
-{
- struct dio_read *dio = container_of(cl, struct dio_read, cl);
-
- dio->req->ki_complete(dio->req, dio->ret);
- bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
-}
-
-static void bch2_direct_IO_read_endio(struct bio *bio)
-{
- struct dio_read *dio = bio->bi_private;
-
- if (bio->bi_status)
- dio->ret = blk_status_to_errno(bio->bi_status);
-
- closure_put(&dio->cl);
-}
-
-static void bch2_direct_IO_read_split_endio(struct bio *bio)
-{
- struct dio_read *dio = bio->bi_private;
- bool should_dirty = dio->should_dirty;
-
- bch2_direct_IO_read_endio(bio);
- bio_check_or_release(bio, should_dirty);
-}
-
-static int bch2_direct_IO_read(struct kiocb *req, struct iov_iter *iter)
-{
- struct file *file = req->ki_filp;
- struct bch_inode_info *inode = file_bch_inode(file);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_io_opts opts;
- struct dio_read *dio;
- struct bio *bio;
- loff_t offset = req->ki_pos;
- bool sync = is_sync_kiocb(req);
- size_t shorten;
- ssize_t ret;
-
- bch2_inode_opts_get(&opts, c, &inode->ei_inode);
-
- if ((offset|iter->count) & (block_bytes(c) - 1))
- return -EINVAL;
-
- ret = min_t(loff_t, iter->count,
- max_t(loff_t, 0, i_size_read(&inode->v) - offset));
-
- if (!ret)
- return ret;
-
- shorten = iov_iter_count(iter) - round_up(ret, block_bytes(c));
- iter->count -= shorten;
-
- bio = bio_alloc_bioset(NULL,
- bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
- REQ_OP_READ,
- GFP_KERNEL,
- &c->dio_read_bioset);
-
- bio->bi_end_io = bch2_direct_IO_read_endio;
-
- dio = container_of(bio, struct dio_read, rbio.bio);
- closure_init(&dio->cl, NULL);
-
- /*
- * this is a _really_ horrible hack just to avoid an atomic sub at the
- * end:
- */
- if (!sync) {
- set_closure_fn(&dio->cl, bch2_dio_read_complete, NULL);
- atomic_set(&dio->cl.remaining,
- CLOSURE_REMAINING_INITIALIZER -
- CLOSURE_RUNNING +
- CLOSURE_DESTRUCTOR);
- } else {
- atomic_set(&dio->cl.remaining,
- CLOSURE_REMAINING_INITIALIZER + 1);
- }
-
- dio->req = req;
- dio->ret = ret;
- /*
- * This is one of the sketchier things I've encountered: we have to skip
- * the dirtying of requests that are internal from the kernel (i.e. from
- * loopback), because we'll deadlock on page_lock.
- */
- dio->should_dirty = iter_is_iovec(iter);
-
- goto start;
- while (iter->count) {
- bio = bio_alloc_bioset(NULL,
- bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
- REQ_OP_READ,
- GFP_KERNEL,
- &c->bio_read);
- bio->bi_end_io = bch2_direct_IO_read_split_endio;
-start:
- bio->bi_opf = REQ_OP_READ|REQ_SYNC;
- bio->bi_iter.bi_sector = offset >> 9;
- bio->bi_private = dio;
-
- ret = bio_iov_iter_get_pages(bio, iter);
- if (ret < 0) {
- /* XXX: fault inject this path */
- bio->bi_status = BLK_STS_RESOURCE;
- bio_endio(bio);
- break;
- }
-
- offset += bio->bi_iter.bi_size;
-
- if (dio->should_dirty)
- bio_set_pages_dirty(bio);
-
- if (iter->count)
- closure_get(&dio->cl);
-
- bch2_read(c, rbio_init(bio, opts), inode_inum(inode));
- }
-
- iter->count += shorten;
-
- if (sync) {
- closure_sync(&dio->cl);
- closure_debug_destroy(&dio->cl);
- ret = dio->ret;
- bio_check_or_release(&dio->rbio.bio, dio->should_dirty);
- return ret;
- } else {
- return -EIOCBQUEUED;
- }
-}
-
-ssize_t bch2_read_iter(struct kiocb *iocb, struct iov_iter *iter)
-{
- struct file *file = iocb->ki_filp;
- struct bch_inode_info *inode = file_bch_inode(file);
- struct address_space *mapping = file->f_mapping;
- size_t count = iov_iter_count(iter);
- ssize_t ret;
-
- if (!count)
- return 0; /* skip atime */
-
- if (iocb->ki_flags & IOCB_DIRECT) {
- struct blk_plug plug;
-
- if (unlikely(mapping->nrpages)) {
- ret = filemap_write_and_wait_range(mapping,
- iocb->ki_pos,
- iocb->ki_pos + count - 1);
- if (ret < 0)
- goto out;
- }
-
- file_accessed(file);
-
- blk_start_plug(&plug);
- ret = bch2_direct_IO_read(iocb, iter);
- blk_finish_plug(&plug);
-
- if (ret >= 0)
- iocb->ki_pos += ret;
- } else {
- bch2_pagecache_add_get(inode);
- ret = generic_file_read_iter(iocb, iter);
- bch2_pagecache_add_put(inode);
- }
-out:
- return bch2_err_class(ret);
-}
-
-/* O_DIRECT writes */
-
-static bool bch2_check_range_allocated(struct bch_fs *c, subvol_inum inum,
- u64 offset, u64 size,
- unsigned nr_replicas, bool compressed)
-{
- struct btree_trans trans;
- struct btree_iter iter;
- struct bkey_s_c k;
- u64 end = offset + size;
- u32 snapshot;
- bool ret = true;
- int err;
-
- bch2_trans_init(&trans, c, 0, 0);
-retry:
- bch2_trans_begin(&trans);
-
- err = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
- if (err)
- goto err;
-
- for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
- SPOS(inum.inum, offset, snapshot),
- BTREE_ITER_SLOTS, k, err) {
- if (bkey_ge(bkey_start_pos(k.k), POS(inum.inum, end)))
- break;
-
- if (k.k->p.snapshot != snapshot ||
- nr_replicas > bch2_bkey_replicas(c, k) ||
- (!compressed && bch2_bkey_sectors_compressed(k))) {
- ret = false;
- break;
- }
- }
-
- offset = iter.pos.offset;
- bch2_trans_iter_exit(&trans, &iter);
-err:
- if (bch2_err_matches(err, BCH_ERR_transaction_restart))
- goto retry;
- bch2_trans_exit(&trans);
-
- return err ? false : ret;
-}
-
-static noinline bool bch2_dio_write_check_allocated(struct dio_write *dio)
-{
- struct bch_fs *c = dio->op.c;
- struct bch_inode_info *inode = dio->inode;
- struct bio *bio = &dio->op.wbio.bio;
-
- return bch2_check_range_allocated(c, inode_inum(inode),
- dio->op.pos.offset, bio_sectors(bio),
- dio->op.opts.data_replicas,
- dio->op.opts.compression != 0);
-}
-
-static void bch2_dio_write_loop_async(struct bch_write_op *);
-static __always_inline long bch2_dio_write_done(struct dio_write *dio);
-
-/*
- * We're going to return -EIOCBQUEUED, but we haven't finished consuming the
- * iov_iter yet, so we need to stash a copy of the iovec: it might be on the
- * caller's stack, we're not guaranteed that it will live for the duration of
- * the IO:
- */
-static noinline int bch2_dio_write_copy_iov(struct dio_write *dio)
-{
- struct iovec *iov = dio->inline_vecs;
-
- /*
- * iov_iter has a single embedded iovec - nothing to do:
- */
- if (iter_is_ubuf(&dio->iter))
- return 0;
-
- /*
- * We don't currently handle non-iovec iov_iters here - return an error,
- * and we'll fall back to doing the IO synchronously:
- */
- if (!iter_is_iovec(&dio->iter))
- return -1;
-
- if (dio->iter.nr_segs > ARRAY_SIZE(dio->inline_vecs)) {
- iov = kmalloc_array(dio->iter.nr_segs, sizeof(*iov),
- GFP_KERNEL);
- if (unlikely(!iov))
- return -ENOMEM;
-
- dio->free_iov = true;
- }
-
- memcpy(iov, dio->iter.__iov, dio->iter.nr_segs * sizeof(*iov));
- dio->iter.__iov = iov;
- return 0;
-}
-
-static void bch2_dio_write_flush_done(struct closure *cl)
-{
- struct dio_write *dio = container_of(cl, struct dio_write, op.cl);
- struct bch_fs *c = dio->op.c;
-
- closure_debug_destroy(cl);
-
- dio->op.error = bch2_journal_error(&c->journal);
-
- bch2_dio_write_done(dio);
-}
-
-static noinline void bch2_dio_write_flush(struct dio_write *dio)
-{
- struct bch_fs *c = dio->op.c;
- struct bch_inode_unpacked inode;
- int ret;
-
- dio->flush = 0;
-
- closure_init(&dio->op.cl, NULL);
-
- if (!dio->op.error) {
- ret = bch2_inode_find_by_inum(c, inode_inum(dio->inode), &inode);
- if (ret) {
- dio->op.error = ret;
- } else {
- bch2_journal_flush_seq_async(&c->journal, inode.bi_journal_seq, &dio->op.cl);
- bch2_inode_flush_nocow_writes_async(c, dio->inode, &dio->op.cl);
- }
- }
-
- if (dio->sync) {
- closure_sync(&dio->op.cl);
- closure_debug_destroy(&dio->op.cl);
- } else {
- continue_at(&dio->op.cl, bch2_dio_write_flush_done, NULL);
- }
-}
-
-static __always_inline long bch2_dio_write_done(struct dio_write *dio)
-{
- struct kiocb *req = dio->req;
- struct bch_inode_info *inode = dio->inode;
- bool sync = dio->sync;
- long ret;
-
- if (unlikely(dio->flush)) {
- bch2_dio_write_flush(dio);
- if (!sync)
- return -EIOCBQUEUED;
- }
-
- bch2_pagecache_block_put(inode);
-
- if (dio->free_iov)
- kfree(dio->iter.__iov);
-
- ret = dio->op.error ?: ((long) dio->written << 9);
- bio_put(&dio->op.wbio.bio);
-
- /* inode->i_dio_count is our ref on inode and thus bch_fs */
- inode_dio_end(&inode->v);
-
- if (ret < 0)
- ret = bch2_err_class(ret);
-
- if (!sync) {
- req->ki_complete(req, ret);
- ret = -EIOCBQUEUED;
- }
- return ret;
-}
-
-static __always_inline void bch2_dio_write_end(struct dio_write *dio)
-{
- struct bch_fs *c = dio->op.c;
- struct kiocb *req = dio->req;
- struct bch_inode_info *inode = dio->inode;
- struct bio *bio = &dio->op.wbio.bio;
-
- req->ki_pos += (u64) dio->op.written << 9;
- dio->written += dio->op.written;
-
- if (dio->extending) {
- spin_lock(&inode->v.i_lock);
- if (req->ki_pos > inode->v.i_size)
- i_size_write(&inode->v, req->ki_pos);
- spin_unlock(&inode->v.i_lock);
- }
-
- if (dio->op.i_sectors_delta || dio->quota_res.sectors) {
- mutex_lock(&inode->ei_quota_lock);
- __i_sectors_acct(c, inode, &dio->quota_res, dio->op.i_sectors_delta);
- __bch2_quota_reservation_put(c, inode, &dio->quota_res);
- mutex_unlock(&inode->ei_quota_lock);
- }
-
- bio_release_pages(bio, false);
-
- if (unlikely(dio->op.error))
- set_bit(EI_INODE_ERROR, &inode->ei_flags);
-}
-
-static __always_inline long bch2_dio_write_loop(struct dio_write *dio)
-{
- struct bch_fs *c = dio->op.c;
- struct kiocb *req = dio->req;
- struct address_space *mapping = dio->mapping;
- struct bch_inode_info *inode = dio->inode;
- struct bch_io_opts opts;
- struct bio *bio = &dio->op.wbio.bio;
- unsigned unaligned, iter_count;
- bool sync = dio->sync, dropped_locks;
- long ret;
-
- bch2_inode_opts_get(&opts, c, &inode->ei_inode);
-
- while (1) {
- iter_count = dio->iter.count;
-
- EBUG_ON(current->faults_disabled_mapping);
- current->faults_disabled_mapping = mapping;
-
- ret = bio_iov_iter_get_pages(bio, &dio->iter);
-
- dropped_locks = fdm_dropped_locks();
-
- current->faults_disabled_mapping = NULL;
-
- /*
- * If the fault handler returned an error but also signalled
- * that it dropped & retook ei_pagecache_lock, we just need to
- * re-shoot down the page cache and retry:
- */
- if (dropped_locks && ret)
- ret = 0;
-
- if (unlikely(ret < 0))
- goto err;
-
- if (unlikely(dropped_locks)) {
- ret = write_invalidate_inode_pages_range(mapping,
- req->ki_pos,
- req->ki_pos + iter_count - 1);
- if (unlikely(ret))
- goto err;
-
- if (!bio->bi_iter.bi_size)
- continue;
- }
-
- unaligned = bio->bi_iter.bi_size & (block_bytes(c) - 1);
- bio->bi_iter.bi_size -= unaligned;
- iov_iter_revert(&dio->iter, unaligned);
-
- if (!bio->bi_iter.bi_size) {
- /*
- * bio_iov_iter_get_pages was only able to get <
- * blocksize worth of pages:
- */
- ret = -EFAULT;
- goto err;
- }
-
- bch2_write_op_init(&dio->op, c, opts);
- dio->op.end_io = sync
- ? NULL
- : bch2_dio_write_loop_async;
- dio->op.target = dio->op.opts.foreground_target;
- dio->op.write_point = writepoint_hashed((unsigned long) current);
- dio->op.nr_replicas = dio->op.opts.data_replicas;
- dio->op.subvol = inode->ei_subvol;
- dio->op.pos = POS(inode->v.i_ino, (u64) req->ki_pos >> 9);
- dio->op.devs_need_flush = &inode->ei_devs_need_flush;
-
- if (sync)
- dio->op.flags |= BCH_WRITE_SYNC;
- dio->op.flags |= BCH_WRITE_CHECK_ENOSPC;
-
- ret = bch2_quota_reservation_add(c, inode, &dio->quota_res,
- bio_sectors(bio), true);
- if (unlikely(ret))
- goto err;
-
- ret = bch2_disk_reservation_get(c, &dio->op.res, bio_sectors(bio),
- dio->op.opts.data_replicas, 0);
- if (unlikely(ret) &&
- !bch2_dio_write_check_allocated(dio))
- goto err;
-
- task_io_account_write(bio->bi_iter.bi_size);
-
- if (unlikely(dio->iter.count) &&
- !dio->sync &&
- !dio->loop &&
- bch2_dio_write_copy_iov(dio))
- dio->sync = sync = true;
-
- dio->loop = true;
- closure_call(&dio->op.cl, bch2_write, NULL, NULL);
-
- if (!sync)
- return -EIOCBQUEUED;
-
- bch2_dio_write_end(dio);
-
- if (likely(!dio->iter.count) || dio->op.error)
- break;
-
- bio_reset(bio, NULL, REQ_OP_WRITE);
+ bio->bio.bi_end_io = nocow_flush_endio;
+ closure_bio_submit(&bio->bio, cl);
}
-out:
- return bch2_dio_write_done(dio);
-err:
- dio->op.error = ret;
-
- bio_release_pages(bio, false);
-
- bch2_quota_reservation_put(c, inode, &dio->quota_res);
- goto out;
}
-static noinline __cold void bch2_dio_write_continue(struct dio_write *dio)
+static int bch2_inode_flush_nocow_writes(struct bch_fs *c,
+ struct bch_inode_info *inode)
{
- struct mm_struct *mm = dio->mm;
+ struct closure cl;
- bio_reset(&dio->op.wbio.bio, NULL, REQ_OP_WRITE);
+ closure_init_stack(&cl);
+ bch2_inode_flush_nocow_writes_async(c, inode, &cl);
+ closure_sync(&cl);
- if (mm)
- kthread_use_mm(mm);
- bch2_dio_write_loop(dio);
- if (mm)
- kthread_unuse_mm(mm);
+ return 0;
}
-static void bch2_dio_write_loop_async(struct bch_write_op *op)
-{
- struct dio_write *dio = container_of(op, struct dio_write, op);
-
- bch2_dio_write_end(dio);
+/* i_size updates: */
- if (likely(!dio->iter.count) || dio->op.error)
- bch2_dio_write_done(dio);
- else
- bch2_dio_write_continue(dio);
-}
+struct inode_new_size {
+ loff_t new_size;
+ u64 now;
+ unsigned fields;
+};
-static noinline
-ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
+static int inode_set_size(struct btree_trans *trans,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ void *p)
{
- struct file *file = req->ki_filp;
- struct address_space *mapping = file->f_mapping;
- struct bch_inode_info *inode = file_bch_inode(file);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct dio_write *dio;
- struct bio *bio;
- bool locked = true, extending;
- ssize_t ret;
-
- prefetch(&c->opts);
- prefetch((void *) &c->opts + 64);
- prefetch(&inode->ei_inode);
- prefetch((void *) &inode->ei_inode + 64);
-
- inode_lock(&inode->v);
-
- ret = generic_write_checks(req, iter);
- if (unlikely(ret <= 0))
- goto err;
-
- ret = file_remove_privs(file);
- if (unlikely(ret))
- goto err;
-
- ret = file_update_time(file);
- if (unlikely(ret))
- goto err;
-
- if (unlikely((req->ki_pos|iter->count) & (block_bytes(c) - 1)))
- goto err;
-
- inode_dio_begin(&inode->v);
- bch2_pagecache_block_get(inode);
-
- extending = req->ki_pos + iter->count > inode->v.i_size;
- if (!extending) {
- inode_unlock(&inode->v);
- locked = false;
- }
+ struct inode_new_size *s = p;
- bio = bio_alloc_bioset(NULL,
- bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS),
- REQ_OP_WRITE,
- GFP_KERNEL,
- &c->dio_write_bioset);
- dio = container_of(bio, struct dio_write, op.wbio.bio);
- dio->req = req;
- dio->mapping = mapping;
- dio->inode = inode;
- dio->mm = current->mm;
- dio->loop = false;
- dio->extending = extending;
- dio->sync = is_sync_kiocb(req) || extending;
- dio->flush = iocb_is_dsync(req) && !c->opts.journal_flush_disabled;
- dio->free_iov = false;
- dio->quota_res.sectors = 0;
- dio->written = 0;
- dio->iter = *iter;
- dio->op.c = c;
-
- if (unlikely(mapping->nrpages)) {
- ret = write_invalidate_inode_pages_range(mapping,
- req->ki_pos,
- req->ki_pos + iter->count - 1);
- if (unlikely(ret))
- goto err_put_bio;
- }
+ bi->bi_size = s->new_size;
+ if (s->fields & ATTR_ATIME)
+ bi->bi_atime = s->now;
+ if (s->fields & ATTR_MTIME)
+ bi->bi_mtime = s->now;
+ if (s->fields & ATTR_CTIME)
+ bi->bi_ctime = s->now;
- ret = bch2_dio_write_loop(dio);
-err:
- if (locked)
- inode_unlock(&inode->v);
- return ret;
-err_put_bio:
- bch2_pagecache_block_put(inode);
- bio_put(bio);
- inode_dio_end(&inode->v);
- goto err;
+ return 0;
}
-ssize_t bch2_write_iter(struct kiocb *iocb, struct iov_iter *from)
+int __must_check bch2_write_inode_size(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ loff_t new_size, unsigned fields)
{
- struct file *file = iocb->ki_filp;
- struct bch_inode_info *inode = file_bch_inode(file);
- ssize_t ret;
-
- if (iocb->ki_flags & IOCB_DIRECT) {
- ret = bch2_direct_write(iocb, from);
- goto out;
- }
-
- /* We can write back this queue in page reclaim */
- current->backing_dev_info = inode_to_bdi(&inode->v);
- inode_lock(&inode->v);
-
- ret = generic_write_checks(iocb, from);
- if (ret <= 0)
- goto unlock;
+ struct inode_new_size s = {
+ .new_size = new_size,
+ .now = bch2_current_time(c),
+ .fields = fields,
+ };
- ret = file_remove_privs(file);
- if (ret)
- goto unlock;
+ return bch2_write_inode(c, inode, inode_set_size, &s, fields);
+}
- ret = file_update_time(file);
- if (ret)
- goto unlock;
+void __bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
+ struct quota_res *quota_res, s64 sectors)
+{
+ bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,
+ "inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
+ inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
+ inode->ei_inode.bi_sectors);
+ inode->v.i_blocks += sectors;
- ret = bch2_buffered_write(iocb, from);
- if (likely(ret > 0))
- iocb->ki_pos += ret;
-unlock:
- inode_unlock(&inode->v);
- current->backing_dev_info = NULL;
+#ifdef CONFIG_BCACHEFS_QUOTA
+ if (quota_res &&
+ !test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags) &&
+ sectors > 0) {
+ BUG_ON(sectors > quota_res->sectors);
+ BUG_ON(sectors > inode->ei_quota_reserved);
- if (ret > 0)
- ret = generic_write_sync(iocb, ret);
-out:
- return bch2_err_class(ret);
+ quota_res->sectors -= sectors;
+ inode->ei_quota_reserved -= sectors;
+ } else {
+ bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors, KEY_TYPE_QUOTA_WARN);
+ }
+#endif
}
/* fsync: */
struct bpos start,
struct bpos end)
{
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct bkey_s_c k;
int ret = 0;
-
- bch2_trans_init(&trans, c, 0, 0);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans, subvol, &start.snapshot);
+ ret = bch2_subvolume_get_snapshot(trans, subvol, &start.snapshot);
if (ret)
goto err;
- for_each_btree_key_upto_norestart(&trans, iter, BTREE_ID_extents, start, end, 0, k, ret)
+ for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_extents, start, end, 0, k, ret)
if (bkey_extent_is_data(k.k) && !bkey_extent_is_unwritten(k)) {
ret = 1;
break;
}
start = iter.pos;
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
return ret;
}
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct address_space *mapping = inode->v.i_mapping;
struct bch_folio *s;
- unsigned start_offset = start & (PAGE_SIZE - 1);
- unsigned end_offset = ((end - 1) & (PAGE_SIZE - 1)) + 1;
+ unsigned start_offset;
+ unsigned end_offset;
unsigned i;
struct folio *folio;
s64 i_sectors_delta = 0;
folio = __filemap_get_folio(mapping, index,
FGP_LOCK|FGP_CREAT, GFP_KERNEL);
- if (unlikely(IS_ERR_OR_NULL(folio))) {
+ if (IS_ERR_OR_NULL(folio)) {
ret = -ENOMEM;
goto out;
}
s->s[i].nr_replicas = 0;
i_sectors_delta -= s->s[i].state == SECTOR_dirty;
- folio_sector_set(folio, s, i, SECTOR_unallocated);
+ bch2_folio_sector_set(folio, s, i, SECTOR_unallocated);
}
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
/*
* Caller needs to know whether this folio will be written out by
return bch2_setattr_nonsize(idmap, inode, iattr);
}
-static int bch2_truncate_finish_fn(struct bch_inode_info *inode,
- struct bch_inode_unpacked *bi,
- void *p)
-{
- bi->bi_flags &= ~BCH_INODE_I_SIZE_DIRTY;
- return 0;
-}
-
-static int bch2_truncate_start_fn(struct bch_inode_info *inode,
- struct bch_inode_unpacked *bi, void *p)
-{
- u64 *new_i_size = p;
-
- bi->bi_flags |= BCH_INODE_I_SIZE_DIRTY;
- bi->bi_size = *new_i_size;
- return 0;
-}
-
-int bch2_truncate(struct mnt_idmap *idmap,
+int bchfs_truncate(struct mnt_idmap *idmap,
struct bch_inode_info *inode, struct iattr *iattr)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct address_space *mapping = inode->v.i_mapping;
struct bch_inode_unpacked inode_u;
- u64 new_i_size = iattr->ia_size;
s64 i_sectors_delta = 0;
int ret = 0;
if (unlikely(ret < 0))
goto err;
+ truncate_setsize(&inode->v, iattr->ia_size);
+
/*
* When extending, we're going to write the new i_size to disk
* immediately so we need to flush anything above the current on disk
if (ret)
goto err;
- mutex_lock(&inode->ei_update_lock);
- ret = bch2_write_inode(c, inode, bch2_truncate_start_fn,
- &new_i_size, 0);
- mutex_unlock(&inode->ei_update_lock);
+ ret = bch2_truncate(c, inode_inum(inode), iattr->ia_size, &i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
- if (unlikely(ret))
+ if (unlikely(ret)) {
+ /*
+ * If we error here, VFS caches are now inconsistent with btree
+ */
+ set_bit(EI_INODE_ERROR, &inode->ei_flags);
goto err;
-
- truncate_setsize(&inode->v, iattr->ia_size);
-
- ret = bch2_fpunch(c, inode_inum(inode),
- round_up(iattr->ia_size, block_bytes(c)) >> 9,
- U64_MAX, &i_sectors_delta);
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
+ }
bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&
!bch2_journal_error(&c->journal), c,
"inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",
inode->v.i_ino, (u64) inode->v.i_blocks,
inode->ei_inode.bi_sectors);
- if (unlikely(ret))
- goto err;
-
- mutex_lock(&inode->ei_update_lock);
- ret = bch2_write_inode(c, inode, bch2_truncate_finish_fn, NULL, 0);
- mutex_unlock(&inode->ei_update_lock);
ret = bch2_setattr_nonsize(idmap, inode, iattr);
err:
/* fallocate: */
-static int inode_update_times_fn(struct bch_inode_info *inode,
+static int inode_update_times_fn(struct btree_trans *trans,
+ struct bch_inode_info *inode,
struct bch_inode_unpacked *bi, void *p)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
ret = bch2_fpunch(c, inode_inum(inode),
block_start >> 9, block_end >> 9,
&i_sectors_delta);
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
}
mutex_lock(&inode->ei_update_lock);
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct address_space *mapping = inode->v.i_mapping;
- struct bkey_buf copy;
- struct btree_trans trans;
- struct btree_iter src, dst, del;
- loff_t shift, new_size;
- u64 src_start;
+ s64 i_sectors_delta = 0;
int ret = 0;
if ((offset | len) & (block_bytes(c) - 1))
return -EINVAL;
if (insert) {
- if (inode->v.i_sb->s_maxbytes - inode->v.i_size < len)
- return -EFBIG;
-
if (offset >= inode->v.i_size)
return -EINVAL;
-
- src_start = U64_MAX;
- shift = len;
} else {
if (offset + len >= inode->v.i_size)
return -EINVAL;
-
- src_start = offset + len;
- shift = -len;
}
- new_size = inode->v.i_size + shift;
-
- ret = write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
+ ret = bch2_write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
if (ret)
return ret;
- if (insert) {
- i_size_write(&inode->v, new_size);
- mutex_lock(&inode->ei_update_lock);
- ret = bch2_write_inode_size(c, inode, new_size,
- ATTR_MTIME|ATTR_CTIME);
- mutex_unlock(&inode->ei_update_lock);
- } else {
- s64 i_sectors_delta = 0;
-
- ret = bch2_fpunch(c, inode_inum(inode),
- offset >> 9, (offset + len) >> 9,
- &i_sectors_delta);
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
-
- if (ret)
- return ret;
- }
-
- bch2_bkey_buf_init(©);
- bch2_trans_init(&trans, c, BTREE_ITER_MAX, 1024);
- bch2_trans_iter_init(&trans, &src, BTREE_ID_extents,
- POS(inode->v.i_ino, src_start >> 9),
- BTREE_ITER_INTENT);
- bch2_trans_copy_iter(&dst, &src);
- bch2_trans_copy_iter(&del, &src);
-
- while (ret == 0 ||
- bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
- struct disk_reservation disk_res =
- bch2_disk_reservation_init(c, 0);
- struct bkey_i delete;
- struct bkey_s_c k;
- struct bpos next_pos;
- struct bpos move_pos = POS(inode->v.i_ino, offset >> 9);
- struct bpos atomic_end;
- unsigned trigger_flags = 0;
- u32 snapshot;
-
- bch2_trans_begin(&trans);
-
- ret = bch2_subvolume_get_snapshot(&trans,
- inode->ei_subvol, &snapshot);
- if (ret)
- continue;
-
- bch2_btree_iter_set_snapshot(&src, snapshot);
- bch2_btree_iter_set_snapshot(&dst, snapshot);
- bch2_btree_iter_set_snapshot(&del, snapshot);
-
- bch2_trans_begin(&trans);
-
- k = insert
- ? bch2_btree_iter_peek_prev(&src)
- : bch2_btree_iter_peek_upto(&src, POS(inode->v.i_ino, U64_MAX));
- if ((ret = bkey_err(k)))
- continue;
-
- if (!k.k || k.k->p.inode != inode->v.i_ino)
- break;
-
- if (insert &&
- bkey_le(k.k->p, POS(inode->v.i_ino, offset >> 9)))
- break;
-reassemble:
- bch2_bkey_buf_reassemble(©, c, k);
-
- if (insert &&
- bkey_lt(bkey_start_pos(k.k), move_pos))
- bch2_cut_front(move_pos, copy.k);
-
- copy.k->k.p.offset += shift >> 9;
- bch2_btree_iter_set_pos(&dst, bkey_start_pos(©.k->k));
-
- ret = bch2_extent_atomic_end(&trans, &dst, copy.k, &atomic_end);
- if (ret)
- continue;
-
- if (!bkey_eq(atomic_end, copy.k->k.p)) {
- if (insert) {
- move_pos = atomic_end;
- move_pos.offset -= shift >> 9;
- goto reassemble;
- } else {
- bch2_cut_back(atomic_end, copy.k);
- }
- }
-
- bkey_init(&delete.k);
- delete.k.p = copy.k->k.p;
- delete.k.size = copy.k->k.size;
- delete.k.p.offset -= shift >> 9;
- bch2_btree_iter_set_pos(&del, bkey_start_pos(&delete.k));
-
- next_pos = insert ? bkey_start_pos(&delete.k) : delete.k.p;
-
- if (copy.k->k.size != k.k->size) {
- /* We might end up splitting compressed extents: */
- unsigned nr_ptrs =
- bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy.k));
-
- ret = bch2_disk_reservation_get(c, &disk_res,
- copy.k->k.size, nr_ptrs,
- BCH_DISK_RESERVATION_NOFAIL);
- BUG_ON(ret);
- }
-
- ret = bch2_btree_iter_traverse(&del) ?:
- bch2_trans_update(&trans, &del, &delete, trigger_flags) ?:
- bch2_trans_update(&trans, &dst, copy.k, trigger_flags) ?:
- bch2_trans_commit(&trans, &disk_res, NULL,
- BTREE_INSERT_NOFAIL);
- bch2_disk_reservation_put(c, &disk_res);
-
- if (!ret)
- bch2_btree_iter_set_pos(&src, next_pos);
- }
- bch2_trans_iter_exit(&trans, &del);
- bch2_trans_iter_exit(&trans, &dst);
- bch2_trans_iter_exit(&trans, &src);
- bch2_trans_exit(&trans);
- bch2_bkey_buf_exit(©, c);
+ if (insert)
+ i_size_write(&inode->v, inode->v.i_size + len);
- if (ret)
- return ret;
+ ret = bch2_fcollapse_finsert(c, inode_inum(inode), offset >> 9, len >> 9,
+ insert, &i_sectors_delta);
+ if (!ret && !insert)
+ i_size_write(&inode->v, inode->v.i_size - len);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
- mutex_lock(&inode->ei_update_lock);
- if (!insert) {
- i_size_write(&inode->v, new_size);
- ret = bch2_write_inode_size(c, inode, new_size,
- ATTR_MTIME|ATTR_CTIME);
- } else {
- /* We need an inode update to update bi_journal_seq for fsync: */
- ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
- ATTR_MTIME|ATTR_CTIME);
- }
- mutex_unlock(&inode->ei_update_lock);
return ret;
}
u64 start_sector, u64 end_sector)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct bpos end_pos = POS(inode->v.i_ino, end_sector);
struct bch_io_opts opts;
int ret = 0;
bch2_inode_opts_get(&opts, c, &inode->ei_inode);
- bch2_trans_init(&trans, c, BTREE_ITER_MAX, 512);
- bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
POS(inode->v.i_ino, start_sector),
BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
u64 hole_start, hole_end;
u32 snapshot;
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans,
+ ret = bch2_subvolume_get_snapshot(trans,
inode->ei_subvol, &snapshot);
if (ret)
goto bkey_err;
}
if (!(mode & FALLOC_FL_ZERO_RANGE)) {
+ /*
+ * Lock ordering - can't be holding btree locks while
+ * blocking on a folio lock:
+ */
if (bch2_clamp_data_hole(&inode->v,
&hole_start,
&hole_end,
opts.data_replicas, true))
- ret = drop_locks_do(&trans,
+ ret = drop_locks_do(trans,
(bch2_clamp_data_hole(&inode->v,
&hole_start,
&hole_end,
goto bkey_err;
}
- ret = bch2_extent_fallocate(&trans, inode_inum(inode), &iter,
+ ret = bch2_extent_fallocate(trans, inode_inum(inode), &iter,
sectors, opts, &i_sectors_delta,
writepoint_hashed((unsigned long) current));
if (ret)
goto bkey_err;
- i_sectors_acct(c, inode, "a_res, i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, "a_res, i_sectors_delta);
- drop_locks_do(&trans,
- (mark_pagecache_reserved(inode, hole_start, iter.pos.offset), 0));
+ drop_locks_do(trans,
+ (bch2_mark_pagecache_reserved(inode, hole_start, iter.pos.offset), 0));
bkey_err:
bch2_quota_reservation_put(c, inode, "a_res);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
struct quota_res quota_res = { 0 };
s64 i_sectors_delta = 0;
- bch2_fpunch_at(&trans, &iter, inode_inum(inode),
+ bch2_fpunch_at(trans, &iter, inode_inum(inode),
end_sector, &i_sectors_delta);
- i_sectors_acct(c, inode, "a_res, i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, "a_res, i_sectors_delta);
bch2_quota_reservation_put(c, inode, "a_res);
}
- bch2_trans_iter_exit(&trans, &iter);
- bch2_trans_exit(&trans);
+ bch2_trans_iter_exit(trans, &iter);
+ bch2_trans_put(trans);
return ret;
}
u64 start, u64 end)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct bkey_s_c k;
u32 snapshot;
u64 sectors = end - start;
u64 pos = start;
int ret;
-
- bch2_trans_init(&trans, c, 0, 0);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans, inode->ei_subvol, &snapshot);
+ ret = bch2_subvolume_get_snapshot(trans, inode->ei_subvol, &snapshot);
if (ret)
goto err;
- bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
SPOS(inode->v.i_ino, pos, snapshot), 0);
- while (!(ret = btree_trans_too_many_iters(&trans)) &&
+ while (!(ret = btree_trans_too_many_iters(trans)) &&
(k = bch2_btree_iter_peek_upto(&iter, POS(inode->v.i_ino, end - 1))).k &&
!(ret = bkey_err(k))) {
if (bkey_extent_is_allocation(k.k)) {
bch2_btree_iter_advance(&iter);
}
pos = iter.pos.offset;
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
- bch2_trans_exit(&trans);
-
- if (ret)
- return ret;
+ bch2_trans_put(trans);
- return bch2_quota_reservation_add(c, inode, res, sectors, true);
+ return ret ?: bch2_quota_reservation_add(c, inode, res, sectors, true);
}
loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
aligned_len = round_up((u64) len, block_bytes(c));
- ret = write_invalidate_inode_pages_range(dst->v.i_mapping,
+ ret = bch2_write_invalidate_inode_pages_range(dst->v.i_mapping,
pos_dst, pos_dst + len - 1);
if (ret)
goto err;
file_update_time(file_dst);
- mark_pagecache_unallocated(src, pos_src >> 9,
+ bch2_mark_pagecache_unallocated(src, pos_src >> 9,
(pos_src + aligned_len) >> 9);
ret = bch2_remap_range(c,
*/
ret = min((u64) ret << 9, (u64) len);
- i_sectors_acct(c, dst, "a_res, i_sectors_delta);
+ bch2_i_sectors_acct(c, dst, "a_res, i_sectors_delta);
spin_lock(&dst->v.i_lock);
if (pos_dst + ret > dst->v.i_size)
/* fseek: */
-static int folio_data_offset(struct folio *folio, loff_t pos,
- unsigned min_replicas)
-{
- struct bch_folio *s = bch2_folio(folio);
- unsigned i, sectors = folio_sectors(folio);
-
- if (s)
- for (i = folio_pos_to_s(folio, pos); i < sectors; i++)
- if (s->s[i].state >= SECTOR_dirty &&
- s->s[i].nr_replicas + s->s[i].replicas_reserved >= min_replicas)
- return i << SECTOR_SHIFT;
-
- return -1;
-}
-
-static loff_t bch2_seek_pagecache_data(struct inode *vinode,
- loff_t start_offset,
- loff_t end_offset,
- unsigned min_replicas,
- bool nonblock)
-{
- struct folio_batch fbatch;
- pgoff_t start_index = start_offset >> PAGE_SHIFT;
- pgoff_t end_index = end_offset >> PAGE_SHIFT;
- pgoff_t index = start_index;
- unsigned i;
- loff_t ret;
- int offset;
-
- folio_batch_init(&fbatch);
-
- while (filemap_get_folios(vinode->i_mapping,
- &index, end_index, &fbatch)) {
- for (i = 0; i < folio_batch_count(&fbatch); i++) {
- struct folio *folio = fbatch.folios[i];
-
- if (!nonblock) {
- folio_lock(folio);
- } else if (!folio_trylock(folio)) {
- folio_batch_release(&fbatch);
- return -EAGAIN;
- }
-
- offset = folio_data_offset(folio,
- max(folio_pos(folio), start_offset),
- min_replicas);
- if (offset >= 0) {
- ret = clamp(folio_pos(folio) + offset,
- start_offset, end_offset);
- folio_unlock(folio);
- folio_batch_release(&fbatch);
- return ret;
- }
- folio_unlock(folio);
- }
- folio_batch_release(&fbatch);
- cond_resched();
- }
-
- return end_offset;
-}
-
static loff_t bch2_seek_data(struct file *file, u64 offset)
{
struct bch_inode_info *inode = file_bch_inode(file);
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans trans;
+ struct btree_trans *trans;
struct btree_iter iter;
struct bkey_s_c k;
subvol_inum inum = inode_inum(inode);
if (offset >= isize)
return -ENXIO;
- bch2_trans_init(&trans, c, 0, 0);
+ trans = bch2_trans_get(c);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
+ ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
if (ret)
goto err;
- for_each_btree_key_upto_norestart(&trans, iter, BTREE_ID_extents,
+ for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_extents,
SPOS(inode->v.i_ino, offset >> 9, snapshot),
POS(inode->v.i_ino, U64_MAX),
0, k, ret) {
} else if (k.k->p.offset >> 9 > isize)
break;
}
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
if (ret)
return ret;
return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
}
-static int folio_hole_offset(struct address_space *mapping, loff_t *offset,
- unsigned min_replicas, bool nonblock)
-{
- struct folio *folio;
- struct bch_folio *s;
- unsigned i, sectors;
- bool ret = true;
-
- folio = __filemap_get_folio(mapping, *offset >> PAGE_SHIFT,
- !nonblock ? FGP_LOCK : 0, 0);
- if (IS_ERR_OR_NULL(folio))
- return true;
-
- if (nonblock && !folio_trylock(folio)) {
- folio_put(folio);
- return -EAGAIN;
- }
-
- s = bch2_folio(folio);
- if (!s)
- goto unlock;
-
- sectors = folio_sectors(folio);
- for (i = folio_pos_to_s(folio, *offset); i < sectors; i++)
- if (s->s[i].state < SECTOR_dirty ||
- s->s[i].nr_replicas + s->s[i].replicas_reserved < min_replicas) {
- *offset = max(*offset,
- folio_pos(folio) + (i << SECTOR_SHIFT));
- goto unlock;
- }
-
- *offset = folio_end_pos(folio);
- ret = false;
-unlock:
- folio_unlock(folio);
- folio_put(folio);
- return ret;
-}
-
-static loff_t bch2_seek_pagecache_hole(struct inode *vinode,
- loff_t start_offset,
- loff_t end_offset,
- unsigned min_replicas,
- bool nonblock)
-{
- struct address_space *mapping = vinode->i_mapping;
- loff_t offset = start_offset;
-
- while (offset < end_offset &&
- !folio_hole_offset(mapping, &offset, min_replicas, nonblock))
- ;
-
- return min(offset, end_offset);
-}
-
-static int bch2_clamp_data_hole(struct inode *inode,
- u64 *hole_start,
- u64 *hole_end,
- unsigned min_replicas,
- bool nonblock)
-{
- loff_t ret;
-
- ret = bch2_seek_pagecache_hole(inode,
- *hole_start << 9, *hole_end << 9, min_replicas, nonblock) >> 9;
- if (ret < 0)
- return ret;
-
- *hole_start = ret;
-
- if (*hole_start == *hole_end)
- return 0;
-
- ret = bch2_seek_pagecache_data(inode,
- *hole_start << 9, *hole_end << 9, min_replicas, nonblock) >> 9;
- if (ret < 0)
- return ret;
-
- *hole_end = ret;
- return 0;
-}
-
static loff_t bch2_seek_hole(struct file *file, u64 offset)
{
struct bch_inode_info *inode = file_bch_inode(file);
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans trans;
+ struct btree_trans *trans;
struct btree_iter iter;
struct bkey_s_c k;
subvol_inum inum = inode_inum(inode);
if (offset >= isize)
return -ENXIO;
- bch2_trans_init(&trans, c, 0, 0);
+ trans = bch2_trans_get(c);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
+ ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
if (ret)
goto err;
- for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
+ for_each_btree_key_norestart(trans, iter, BTREE_ID_extents,
SPOS(inode->v.i_ino, offset >> 9, snapshot),
BTREE_ITER_SLOTS, k, ret) {
if (k.k->p.inode != inode->v.i_ino) {
offset = max(offset, bkey_start_offset(k.k) << 9);
}
}
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
if (ret)
return ret;
void bch2_fs_fsio_exit(struct bch_fs *c)
{
bioset_exit(&c->nocow_flush_bioset);
- bioset_exit(&c->dio_write_bioset);
- bioset_exit(&c->dio_read_bioset);
- bioset_exit(&c->writepage_bioset);
}
int bch2_fs_fsio_init(struct bch_fs *c)
{
- if (bioset_init(&c->writepage_bioset,
- 4, offsetof(struct bch_writepage_io, op.wbio.bio),
- BIOSET_NEED_BVECS))
- return -BCH_ERR_ENOMEM_writepage_bioset_init;
-
- if (bioset_init(&c->dio_read_bioset,
- 4, offsetof(struct dio_read, rbio.bio),
- BIOSET_NEED_BVECS))
- return -BCH_ERR_ENOMEM_dio_read_bioset_init;
-
- if (bioset_init(&c->dio_write_bioset,
- 4, offsetof(struct dio_write, op.wbio.bio),
- BIOSET_NEED_BVECS))
- return -BCH_ERR_ENOMEM_dio_write_bioset_init;
-
if (bioset_init(&c->nocow_flush_bioset,
1, offsetof(struct nocow_flush, bio), 0))
return -BCH_ERR_ENOMEM_nocow_flush_bioset_init;
projects / bcachefs-tools-debian / blobdiff