#include "bcachefs.h"
#include "alloc_foreground.h"
-#include "bkey_buf.h"
+//#include "bkey_buf.h"
#include "btree_update.h"
#include "buckets.h"
#include "clock.h"
#include "extent_update.h"
#include "fs.h"
#include "fs-io.h"
+#include "fs-io-buffered.h"
+//#include "fs-io-direct.h"
+#include "fs-io-pagecache.h"
#include "fsck.h"
#include "inode.h"
#include "journal.h"
#include "keylist.h"
#include "quota.h"
#include "reflink.h"
+#include "trace.h"
#include <linux/aio.h>
#include <linux/backing-dev.h>
#include <linux/sched/signal.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/uio.h>
-#include <linux/writeback.h>
-#include <trace/events/bcachefs.h>
#include <trace/events/writeback.h>
-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 closure cl;
- struct bch_inode_info *inode;
-
- /* must be last: */
- struct bch_write_op op;
-};
-
-struct dio_write {
- struct completion done;
- struct kiocb *req;
- struct mm_struct *mm;
- unsigned loop:1,
- sync: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;
+struct nocow_flush {
+ struct closure *cl;
+ struct bch_dev *ca;
+ struct bio bio;
};
-/* pagecache_block must be held */
-static int write_invalidate_inode_pages_range(struct address_space *mapping,
- loff_t start, loff_t end)
+static void nocow_flush_endio(struct bio *_bio)
{
- 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);
+ struct nocow_flush *bio = container_of(_bio, struct nocow_flush, bio);
- return ret;
+ closure_put(bio->cl);
+ percpu_ref_put(&bio->ca->io_ref);
+ bio_put(&bio->bio);
}
-/* quotas */
-
-#ifdef CONFIG_BCACHEFS_QUOTA
-
-static void bch2_quota_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res)
+void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ struct closure *cl)
{
- if (!res->sectors)
- return;
+ struct nocow_flush *bio;
+ struct bch_dev *ca;
+ struct bch_devs_mask devs;
+ unsigned dev;
- mutex_lock(&inode->ei_quota_lock);
- BUG_ON(res->sectors > inode->ei_quota_reserved);
+ dev = find_first_bit(inode->ei_devs_need_flush.d, BCH_SB_MEMBERS_MAX);
+ if (dev == BCH_SB_MEMBERS_MAX)
+ return;
- bch2_quota_acct(c, inode->ei_qid, Q_SPC,
- -((s64) res->sectors), KEY_TYPE_QUOTA_PREALLOC);
- inode->ei_quota_reserved -= res->sectors;
- mutex_unlock(&inode->ei_quota_lock);
+ devs = inode->ei_devs_need_flush;
+ memset(&inode->ei_devs_need_flush, 0, sizeof(inode->ei_devs_need_flush));
- res->sectors = 0;
-}
+ for_each_set_bit(dev, devs.d, BCH_SB_MEMBERS_MAX) {
+ rcu_read_lock();
+ ca = rcu_dereference(c->devs[dev]);
+ if (ca && !percpu_ref_tryget(&ca->io_ref))
+ ca = NULL;
+ rcu_read_unlock();
-static int bch2_quota_reservation_add(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct quota_res *res,
- unsigned sectors,
- bool check_enospc)
-{
- int ret;
+ if (!ca)
+ continue;
- 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;
+ bio = container_of(bio_alloc_bioset(ca->disk_sb.bdev, 0,
+ REQ_OP_FLUSH,
+ GFP_KERNEL,
+ &c->nocow_flush_bioset),
+ struct nocow_flush, bio);
+ bio->cl = cl;
+ bio->ca = ca;
+ bio->bio.bi_end_io = nocow_flush_endio;
+ closure_bio_submit(&bio->bio, cl);
}
- 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 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);
-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 {
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)
-{
- if (!sectors)
- return;
-
- mutex_lock(&inode->ei_quota_lock);
-#ifdef CONFIG_BCACHEFS_QUOTA
- if (quota_res && 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
- inode->v.i_blocks += sectors;
- mutex_unlock(&inode->ei_quota_lock);
-}
-
-/* page state: */
-
-/* stored in page->private: */
-
-struct bch_page_sector {
- /* Uncompressed, fully allocated replicas: */
- unsigned nr_replicas:3;
-
- /* Owns PAGE_SECTORS * replicas_reserved sized reservation: */
- unsigned replicas_reserved:3;
-
- /* i_sectors: */
- enum {
- SECTOR_UNALLOCATED,
- SECTOR_RESERVED,
- SECTOR_DIRTY,
- SECTOR_ALLOCATED,
- } state:2;
-};
-
-struct bch_page_state {
- spinlock_t lock;
- atomic_t write_count;
- struct bch_page_sector s[PAGE_SECTORS];
-};
-
-static inline struct bch_page_state *__bch2_page_state(struct page *page)
-{
- return page_has_private(page)
- ? (struct bch_page_state *) page_private(page)
- : NULL;
-}
-
-static inline struct bch_page_state *bch2_page_state(struct page *page)
-{
- EBUG_ON(!PageLocked(page));
-
- return __bch2_page_state(page);
-}
-
-/* for newly allocated pages: */
-static void __bch2_page_state_release(struct page *page)
-{
- kfree(detach_page_private(page));
-}
-
-static void bch2_page_state_release(struct page *page)
-{
- EBUG_ON(!PageLocked(page));
- __bch2_page_state_release(page);
-}
-
-/* for newly allocated pages: */
-static struct bch_page_state *__bch2_page_state_create(struct page *page,
- gfp_t gfp)
-{
- struct bch_page_state *s;
-
- s = kzalloc(sizeof(*s), GFP_NOFS|gfp);
- if (!s)
- return NULL;
-
- spin_lock_init(&s->lock);
- attach_page_private(page, s);
- return s;
-}
-
-static struct bch_page_state *bch2_page_state_create(struct page *page,
- gfp_t gfp)
-{
- return bch2_page_state(page) ?: __bch2_page_state_create(page, gfp);
-}
-
-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_page_sector *s,
- unsigned nr_replicas)
-{
- return max(0, (int) nr_replicas -
- s->nr_replicas -
- s->replicas_reserved);
-}
-
-static int bch2_get_page_disk_reservation(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct page *page, bool check_enospc)
-{
- struct bch_page_state *s = bch2_page_state_create(page, 0);
- unsigned nr_replicas = inode_nr_replicas(c, inode);
- struct disk_reservation disk_res = { 0 };
- unsigned i, disk_res_sectors = 0;
- int ret;
-
- if (!s)
- return -ENOMEM;
-
- for (i = 0; i < ARRAY_SIZE(s->s); 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 < ARRAY_SIZE(s->s); i++)
- s->s[i].replicas_reserved +=
- sectors_to_reserve(&s->s[i], nr_replicas);
-
- return 0;
-}
-
-struct bch2_page_reservation {
- struct disk_reservation disk;
- struct quota_res quota;
-};
-
-static void bch2_page_reservation_init(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct bch2_page_reservation *res)
-{
- memset(res, 0, sizeof(*res));
-
- res->disk.nr_replicas = inode_nr_replicas(c, inode);
-}
-
-static void bch2_page_reservation_put(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct bch2_page_reservation *res)
-{
- bch2_disk_reservation_put(c, &res->disk);
- bch2_quota_reservation_put(c, inode, &res->quota);
-}
-
-static int bch2_page_reservation_get(struct bch_fs *c,
- struct bch_inode_info *inode, struct page *page,
- struct bch2_page_reservation *res,
- unsigned offset, unsigned len, bool check_enospc)
-{
- struct bch_page_state *s = bch2_page_state_create(page, 0);
- unsigned i, disk_sectors = 0, quota_sectors = 0;
- int ret;
-
- if (!s)
- return -ENOMEM;
-
- 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,
- !check_enospc
- ? BCH_DISK_RESERVATION_NOFAIL
- : 0);
- if (unlikely(ret))
- return ret;
- }
-
- if (quota_sectors) {
- ret = bch2_quota_reservation_add(c, inode, &res->quota,
- quota_sectors,
- check_enospc);
- 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_page_bits(struct page *page)
-{
- struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_page_state *s = bch2_page_state(page);
- struct disk_reservation disk_res = { 0 };
- int i, dirty_sectors = 0;
-
- if (!s)
- return;
-
- EBUG_ON(!PageLocked(page));
- EBUG_ON(PageWriteback(page));
-
- for (i = 0; i < ARRAY_SIZE(s->s); i++) {
- disk_res.sectors += s->s[i].replicas_reserved;
- s->s[i].replicas_reserved = 0;
-
- if (s->s[i].state == SECTOR_DIRTY) {
- dirty_sectors++;
- s->s[i].state = SECTOR_UNALLOCATED;
- }
- }
-
- bch2_disk_reservation_put(c, &disk_res);
-
- if (dirty_sectors)
- i_sectors_acct(c, inode, NULL, -dirty_sectors);
-
- bch2_page_state_release(page);
-}
-
-static void bch2_set_page_dirty(struct bch_fs *c,
- struct bch_inode_info *inode, struct page *page,
- struct bch2_page_reservation *res,
- unsigned offset, unsigned len)
-{
- struct bch_page_state *s = bch2_page_state(page);
- unsigned i, dirty_sectors = 0;
-
- WARN_ON((u64) page_offset(page) + offset + len >
- round_up((u64) i_size_read(&inode->v), block_bytes(c)));
-
- 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;
-
- if (s->s[i].state == SECTOR_UNALLOCATED)
- dirty_sectors++;
-
- s->s[i].state = max_t(unsigned, s->s[i].state, SECTOR_DIRTY);
- }
-
- spin_unlock(&s->lock);
-
- if (dirty_sectors)
- i_sectors_acct(c, inode, &res->quota, dirty_sectors);
-
- if (!PageDirty(page))
- __set_page_dirty_nobuffers(page);
-}
-
-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);
- int 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->ei_pagecache_lock))
- goto got_lock;
-
- bch2_pagecache_block_put(&fdm_host->ei_pagecache_lock);
-
- bch2_pagecache_add_get(&inode->ei_pagecache_lock);
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
-
- bch2_pagecache_block_get(&fdm_host->ei_pagecache_lock);
-
- /* Signal that lock has been dropped: */
- set_fdm_dropped_locks();
- return VM_FAULT_SIGBUS;
- }
-
- bch2_pagecache_add_get(&inode->ei_pagecache_lock);
-got_lock:
- ret = filemap_fault(vmf);
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
-
- return ret;
-}
-
-vm_fault_t bch2_page_mkwrite(struct vm_fault *vmf)
-{
- struct page *page = 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_page_reservation res;
- unsigned len;
- loff_t isize;
- int ret = VM_FAULT_LOCKED;
-
- bch2_page_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->ei_pagecache_lock);
-
- lock_page(page);
- isize = i_size_read(&inode->v);
-
- if (page->mapping != mapping || page_offset(page) >= isize) {
- unlock_page(page);
- ret = VM_FAULT_NOPAGE;
- goto out;
- }
-
- len = min_t(loff_t, PAGE_SIZE, isize - page_offset(page));
-
- if (bch2_page_reservation_get(c, inode, page, &res, 0, len, true)) {
- unlock_page(page);
- ret = VM_FAULT_SIGBUS;
- goto out;
- }
-
- bch2_set_page_dirty(c, inode, page, &res, 0, len);
- bch2_page_reservation_put(c, inode, &res);
-
- wait_for_stable_page(page);
-out:
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
- sb_end_pagefault(inode->v.i_sb);
-
- return ret;
-}
-
-void bch2_invalidatepage(struct page *page, unsigned int offset,
- unsigned int length)
-{
- if (offset || length < PAGE_SIZE)
- return;
-
- bch2_clear_page_bits(page);
-}
-
-int bch2_releasepage(struct page *page, gfp_t gfp_mask)
-{
- if (PageDirty(page))
- return 0;
-
- bch2_clear_page_bits(page);
- return 1;
-}
-
-#ifdef CONFIG_MIGRATION
-int bch2_migrate_page(struct address_space *mapping, struct page *newpage,
- struct page *page, enum migrate_mode mode)
-{
- int ret;
-
- EBUG_ON(!PageLocked(page));
- EBUG_ON(!PageLocked(newpage));
-
- ret = migrate_page_move_mapping(mapping, newpage, page, 0);
- if (ret != MIGRATEPAGE_SUCCESS)
- return ret;
-
- if (PagePrivate(page))
- attach_page_private(newpage, detach_page_private(page));
-
- if (mode != MIGRATE_SYNC_NO_COPY)
- migrate_page_copy(newpage, page);
- else
- migrate_page_states(newpage, page);
- return MIGRATEPAGE_SUCCESS;
-}
-#endif
-
-/* readpage(s): */
-
-static void bch2_readpages_end_io(struct bio *bio)
-{
- struct bvec_iter_all iter;
- struct bio_vec *bv;
-
- bio_for_each_segment_all(bv, bio, iter) {
- struct page *page = bv->bv_page;
-
- if (!bio->bi_status) {
- SetPageUptodate(page);
- } else {
- ClearPageUptodate(page);
- SetPageError(page);
- }
- unlock_page(page);
- }
-
- bio_put(bio);
-}
-
-struct readpages_iter {
- struct address_space *mapping;
- struct page **pages;
- unsigned nr_pages;
- unsigned idx;
- pgoff_t offset;
-};
-
-static int readpages_iter_init(struct readpages_iter *iter,
- struct readahead_control *ractl)
-{
- unsigned i, nr_pages = readahead_count(ractl);
-
- memset(iter, 0, sizeof(*iter));
-
- iter->mapping = ractl->mapping;
- iter->offset = readahead_index(ractl);
- iter->nr_pages = nr_pages;
-
- iter->pages = kmalloc_array(nr_pages, sizeof(struct page *), GFP_NOFS);
- if (!iter->pages)
- return -ENOMEM;
-
- nr_pages = __readahead_batch(ractl, iter->pages, nr_pages);
- for (i = 0; i < nr_pages; i++) {
- __bch2_page_state_create(iter->pages[i], __GFP_NOFAIL);
- put_page(iter->pages[i]);
- }
-
- return 0;
-}
-
-static inline struct page *readpage_iter_next(struct readpages_iter *iter)
-{
- if (iter->idx >= iter->nr_pages)
- return NULL;
-
- EBUG_ON(iter->pages[iter->idx]->index != iter->offset + iter->idx);
-
- return iter->pages[iter->idx];
-}
-
-static void bch2_add_page_sectors(struct bio *bio, struct bkey_s_c k)
-{
- struct bvec_iter iter;
- struct bio_vec bv;
- unsigned nr_ptrs = k.k->type == KEY_TYPE_reflink_v
- ? 0 : bch2_bkey_nr_ptrs_fully_allocated(k);
- unsigned state = k.k->type == KEY_TYPE_reservation
- ? SECTOR_RESERVED
- : SECTOR_ALLOCATED;
-
- bio_for_each_segment(bv, bio, iter) {
- struct bch_page_state *s = bch2_page_state(bv.bv_page);
- unsigned i;
-
- for (i = bv.bv_offset >> 9;
- i < (bv.bv_offset + bv.bv_len) >> 9;
- i++) {
- s->s[i].nr_replicas = nr_ptrs;
- s->s[i].state = state;
- }
- }
-}
-
-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 void readpage_bio_extend(struct readpages_iter *iter,
- struct bio *bio,
- unsigned sectors_this_extent,
- bool get_more)
-{
- while (bio_sectors(bio) < sectors_this_extent &&
- bio->bi_vcnt < bio->bi_max_vecs) {
- pgoff_t page_offset = bio_end_sector(bio) >> PAGE_SECTOR_SHIFT;
- struct page *page = readpage_iter_next(iter);
- int ret;
-
- if (page) {
- if (iter->offset + iter->idx != page_offset)
- break;
-
- iter->idx++;
- } else {
- if (!get_more)
- break;
-
- page = xa_load(&iter->mapping->i_pages, page_offset);
- if (page && !xa_is_value(page))
- break;
-
- page = __page_cache_alloc(readahead_gfp_mask(iter->mapping));
- if (!page)
- break;
-
- if (!__bch2_page_state_create(page, 0)) {
- put_page(page);
- break;
- }
-
- ret = add_to_page_cache_lru(page, iter->mapping,
- page_offset, GFP_NOFS);
- if (ret) {
- __bch2_page_state_release(page);
- put_page(page);
- break;
- }
-
- put_page(page);
- }
-
- BUG_ON(!bio_add_page(bio, page, PAGE_SIZE, 0));
- }
-}
-
-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|BTREE_ITER_FILTER_SNAPSHOTS);
- 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:
- */
- if (!bch2_trans_relock(trans)) {
- ret = -EINTR;
- 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);
-
- bch2_trans_unlock(trans);
-
- if (readpages_iter)
- readpage_bio_extend(readpages_iter, &rbio->bio, sectors,
- extent_partial_reads_expensive(k));
-
- 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;
-
- if (bkey_extent_is_allocation(k.k))
- bch2_add_page_sectors(&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);
- }
-err:
- bch2_trans_iter_exit(trans, &iter);
-
- if (ret == -EINTR)
- goto retry;
-
- if (ret) {
- bch_err_inum_ratelimited(c, inum.inum,
- "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 = io_opts(c, &inode->ei_inode);
- struct btree_trans trans;
- struct page *page;
- struct readpages_iter readpages_iter;
- int ret;
-
- ret = readpages_iter_init(&readpages_iter, ractl);
- BUG_ON(ret);
-
- bch2_trans_init(&trans, c, 0, 0);
-
- bch2_pagecache_add_get(&inode->ei_pagecache_lock);
-
- while ((page = readpage_iter_next(&readpages_iter))) {
- pgoff_t index = readpages_iter.offset + readpages_iter.idx;
- unsigned n = min_t(unsigned,
- readpages_iter.nr_pages -
- readpages_iter.idx,
- BIO_MAX_VECS);
- struct bch_read_bio *rbio =
- rbio_init(bio_alloc_bioset(GFP_NOFS, n, &c->bio_read),
- opts);
-
- readpages_iter.idx++;
-
- bio_set_op_attrs(&rbio->bio, REQ_OP_READ, 0);
- rbio->bio.bi_iter.bi_sector = (sector_t) index << PAGE_SECTOR_SHIFT;
- rbio->bio.bi_end_io = bch2_readpages_end_io;
- BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
-
- bchfs_read(&trans, rbio, inode_inum(inode),
- &readpages_iter);
- }
-
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
-
- bch2_trans_exit(&trans);
- kfree(readpages_iter.pages);
-}
-
-static void __bchfs_readpage(struct bch_fs *c, struct bch_read_bio *rbio,
- subvol_inum inum, struct page *page)
-{
- struct btree_trans trans;
-
- bch2_page_state_create(page, __GFP_NOFAIL);
-
- bio_set_op_attrs(&rbio->bio, REQ_OP_READ, REQ_SYNC);
- rbio->bio.bi_iter.bi_sector =
- (sector_t) page->index << PAGE_SECTOR_SHIFT;
- BUG_ON(!bio_add_page(&rbio->bio, page, PAGE_SIZE, 0));
-
- bch2_trans_init(&trans, c, 0, 0);
- bchfs_read(&trans, rbio, inum, NULL);
- bch2_trans_exit(&trans);
-}
-
-int bch2_readpage(struct file *file, struct page *page)
-{
- struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_io_opts opts = io_opts(c, &inode->ei_inode);
- struct bch_read_bio *rbio;
-
- rbio = rbio_init(bio_alloc_bioset(GFP_NOFS, 1, &c->bio_read), opts);
- rbio->bio.bi_end_io = bch2_readpages_end_io;
-
- __bchfs_readpage(c, rbio, inode_inum(inode), page);
- return 0;
-}
-
-static void bch2_read_single_page_end_io(struct bio *bio)
-{
- complete(bio->bi_private);
-}
-
-static int bch2_read_single_page(struct page *page,
- 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;
- int ret;
- DECLARE_COMPLETION_ONSTACK(done);
-
- rbio = rbio_init(bio_alloc_bioset(GFP_NOFS, 1, &c->bio_read),
- io_opts(c, &inode->ei_inode));
- rbio->bio.bi_private = &done;
- rbio->bio.bi_end_io = bch2_read_single_page_end_io;
-
- __bchfs_readpage(c, rbio, inode_inum(inode), page);
- wait_for_completion(&done);
-
- ret = blk_status_to_errno(rbio->bio.bi_status);
- bio_put(&rbio->bio);
-
- if (ret < 0)
- return ret;
-
- SetPageUptodate(page);
- return 0;
-}
-
-/* writepages: */
-
-struct bch_writepage_state {
- struct bch_writepage_io *io;
- struct bch_io_opts opts;
-};
-
-static inline struct bch_writepage_state bch_writepage_state_init(struct bch_fs *c,
- struct bch_inode_info *inode)
-{
- return (struct bch_writepage_state) {
- .opts = io_opts(c, &inode->ei_inode)
- };
-}
-
-static void bch2_writepage_io_free(struct closure *cl)
-{
- struct bch_writepage_io *io = container_of(cl,
- struct bch_writepage_io, cl);
-
- bio_put(&io->op.wbio.bio);
-}
-
-static void bch2_writepage_io_done(struct closure *cl)
-{
- struct bch_writepage_io *io = container_of(cl,
- struct bch_writepage_io, cl);
- struct bch_fs *c = io->op.c;
- struct bio *bio = &io->op.wbio.bio;
- struct bvec_iter_all iter;
- struct bio_vec *bvec;
- unsigned i;
-
- up(&io->op.c->io_in_flight);
-
- if (io->op.error) {
- set_bit(EI_INODE_ERROR, &io->inode->ei_flags);
-
- bio_for_each_segment_all(bvec, bio, iter) {
- struct bch_page_state *s;
-
- SetPageError(bvec->bv_page);
- mapping_set_error(bvec->bv_page->mapping, -EIO);
-
- s = __bch2_page_state(bvec->bv_page);
- spin_lock(&s->lock);
- for (i = 0; i < PAGE_SECTORS; i++)
- s->s[i].nr_replicas = 0;
- spin_unlock(&s->lock);
- }
- }
-
- if (io->op.flags & BCH_WRITE_WROTE_DATA_INLINE) {
- bio_for_each_segment_all(bvec, bio, iter) {
- struct bch_page_state *s;
-
- s = __bch2_page_state(bvec->bv_page);
- spin_lock(&s->lock);
- for (i = 0; i < PAGE_SECTORS; 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:
- */
- BUG_ON(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_segment_all(bvec, bio, iter) {
- struct bch_page_state *s = __bch2_page_state(bvec->bv_page);
-
- if (atomic_dec_and_test(&s->write_count))
- end_page_writeback(bvec->bv_page);
- }
-
- closure_return_with_destructor(&io->cl, bch2_writepage_io_free);
-}
-
-static void bch2_writepage_do_io(struct bch_writepage_state *w)
-{
- struct bch_writepage_io *io = w->io;
-
- down(&io->op.c->io_in_flight);
-
- w->io = NULL;
- closure_call(&io->op.cl, bch2_write, NULL, &io->cl);
- continue_at(&io->cl, bch2_writepage_io_done, 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(GFP_NOFS, BIO_MAX_VECS,
- &c->writepage_bioset),
- struct bch_writepage_io, op.wbio.bio);
-
- closure_init(&w->io->cl, NULL);
- w->io->inode = inode;
-
- op = &w->io->op;
- bch2_write_op_init(op, c, w->opts);
- op->target = w->opts.foreground_target;
- op_journal_seq_set(op, &inode->ei_journal_seq);
- 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->wbio.bio.bi_iter.bi_sector = sector;
- op->wbio.bio.bi_opf = wbc_to_write_flags(wbc);
-}
-
-static int __bch2_writepage(struct page *page,
- struct writeback_control *wbc,
- void *data)
-{
- struct bch_inode_info *inode = to_bch_ei(page->mapping->host);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bch_writepage_state *w = data;
- struct bch_page_state *s, orig;
- unsigned i, offset, nr_replicas_this_write = U32_MAX;
- loff_t i_size = i_size_read(&inode->v);
- pgoff_t end_index = i_size >> PAGE_SHIFT;
- int ret;
-
- EBUG_ON(!PageUptodate(page));
-
- /* Is the page fully inside i_size? */
- if (page->index < end_index)
- goto do_io;
-
- /* Is the page fully outside i_size? (truncate in progress) */
- offset = i_size & (PAGE_SIZE - 1);
- if (page->index > end_index || !offset) {
- unlock_page(page);
- return 0;
- }
-
- /*
- * The page 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 page size. For a file that is not a multiple of
- * the page size, the remaining memory is zeroed when mapped, and
- * writes to that region are not written out to the file."
- */
- zero_user_segment(page, offset, PAGE_SIZE);
-do_io:
- s = bch2_page_state_create(page, __GFP_NOFAIL);
-
- ret = bch2_get_page_disk_reservation(c, inode, page, true);
- if (ret) {
- SetPageError(page);
- mapping_set_error(page->mapping, ret);
- unlock_page(page);
- return 0;
- }
-
- /* Before unlocking the page, get copy of reservations: */
- orig = *s;
-
- for (i = 0; i < PAGE_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 < PAGE_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;
- s->s[i].state = SECTOR_ALLOCATED;
- }
-
- BUG_ON(atomic_read(&s->write_count));
- atomic_set(&s->write_count, 1);
-
- BUG_ON(PageWriteback(page));
- set_page_writeback(page);
-
- unlock_page(page);
-
- offset = 0;
- while (1) {
- unsigned sectors = 1, dirty_sectors = 0, reserved_sectors = 0;
- u64 sector;
-
- while (offset < PAGE_SECTORS &&
- orig.s[offset].state < SECTOR_DIRTY)
- offset++;
-
- if (offset == PAGE_SECTORS)
- break;
-
- sector = ((u64) page->index << PAGE_SECTOR_SHIFT) + offset;
-
- while (offset + sectors < PAGE_SECTORS &&
- orig.s[offset + sectors].state >= SECTOR_DIRTY)
- sectors++;
-
- for (i = offset; i < offset + sectors; i++) {
- reserved_sectors += orig.s[i].replicas_reserved;
- dirty_sectors += orig.s[i].state == SECTOR_DIRTY;
- }
-
- if (w->io &&
- (w->io->op.res.nr_replicas != nr_replicas_this_write ||
- bio_full(&w->io->op.wbio.bio, PAGE_SIZE) ||
- 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_page(&w->io->op.wbio.bio, page,
- sectors << 9, offset << 9));
-
- /* Check for writing past i_size: */
- WARN_ON((bio_end_sector(&w->io->op.wbio.bio) << 9) >
- round_up(i_size, block_bytes(c)));
-
- 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))
- end_page_writeback(page);
-
- 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);
- return ret;
-}
-
-int bch2_writepage(struct page *page, struct writeback_control *wbc)
-{
- struct bch_fs *c = page->mapping->host->i_sb->s_fs_info;
- struct bch_writepage_state w =
- bch_writepage_state_init(c, to_bch_ei(page->mapping->host));
- int ret;
-
- ret = __bch2_writepage(page, wbc, &w);
- if (w.io)
- bch2_writepage_do_io(&w);
-
- return ret;
-}
-
-/* buffered writes: */
-
-int bch2_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- 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_page_reservation *res;
- pgoff_t index = pos >> PAGE_SHIFT;
- unsigned offset = pos & (PAGE_SIZE - 1);
- struct page *page;
- int ret = -ENOMEM;
-
- res = kmalloc(sizeof(*res), GFP_KERNEL);
- if (!res)
- return -ENOMEM;
-
- bch2_page_reservation_init(c, inode, res);
- *fsdata = res;
-
- bch2_pagecache_add_get(&inode->ei_pagecache_lock);
-
- page = grab_cache_page_write_begin(mapping, index, flags);
- if (!page)
- goto err_unlock;
-
- if (PageUptodate(page))
- goto out;
-
- /* If we're writing entire page, don't need to read it in first: */
- if (len == PAGE_SIZE)
- goto out;
-
- if (!offset && pos + len >= inode->v.i_size) {
- zero_user_segment(page, len, PAGE_SIZE);
- flush_dcache_page(page);
- goto out;
- }
-
- if (index > inode->v.i_size >> PAGE_SHIFT) {
- zero_user_segments(page, 0, offset, offset + len, PAGE_SIZE);
- flush_dcache_page(page);
- goto out;
- }
-readpage:
- ret = bch2_read_single_page(page, mapping);
- if (ret)
- goto err;
-out:
- ret = bch2_page_reservation_get(c, inode, page, res,
- offset, len, true);
- if (ret) {
- if (!PageUptodate(page)) {
- /*
- * If the page 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 page is
- * fully backed by uncompressed data:
- */
- goto readpage;
- }
-
- goto err;
- }
-
- *pagep = page;
- return 0;
-err:
- unlock_page(page);
- put_page(page);
- *pagep = NULL;
-err_unlock:
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
- kfree(res);
- *fsdata = NULL;
- return 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_page_reservation *res = fsdata;
- unsigned offset = pos & (PAGE_SIZE - 1);
-
- lockdep_assert_held(&inode->v.i_rwsem);
-
- if (unlikely(copied < len && !PageUptodate(page))) {
- /*
- * The page needs to be read in, but that would destroy
- * our partial write - simplest thing is to just force
- * userspace to redo the write:
- */
- zero_user(page, 0, PAGE_SIZE);
- flush_dcache_page(page);
- 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 (!PageUptodate(page))
- SetPageUptodate(page);
-
- bch2_set_page_dirty(c, inode, page, res, offset, copied);
-
- inode->ei_last_dirtied = (unsigned long) current;
- }
-
- unlock_page(page);
- put_page(page);
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
-
- bch2_page_reservation_put(c, inode, res);
- kfree(res);
-
- return copied;
-}
-
-#define WRITE_BATCH_PAGES 32
-
-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 page *pages[WRITE_BATCH_PAGES];
- struct bch2_page_reservation res;
- unsigned long index = pos >> PAGE_SHIFT;
- unsigned offset = pos & (PAGE_SIZE - 1);
- unsigned nr_pages = DIV_ROUND_UP(offset + len, PAGE_SIZE);
- unsigned i, reserved = 0, set_dirty = 0;
- unsigned copied = 0, nr_pages_copied = 0;
- int ret = 0;
-
- BUG_ON(!len);
- BUG_ON(nr_pages > ARRAY_SIZE(pages));
-
- bch2_page_reservation_init(c, inode, &res);
-
- for (i = 0; i < nr_pages; i++) {
- pages[i] = grab_cache_page_write_begin(mapping, index + i, 0);
- if (!pages[i]) {
- nr_pages = i;
- if (!i) {
- ret = -ENOMEM;
- goto out;
- }
- len = min_t(unsigned, len,
- nr_pages * PAGE_SIZE - offset);
- break;
- }
- }
-
- if (offset && !PageUptodate(pages[0])) {
- ret = bch2_read_single_page(pages[0], mapping);
- if (ret)
- goto out;
- }
-
- if ((pos + len) & (PAGE_SIZE - 1) &&
- !PageUptodate(pages[nr_pages - 1])) {
- if ((index + nr_pages - 1) << PAGE_SHIFT >= inode->v.i_size) {
- zero_user(pages[nr_pages - 1], 0, PAGE_SIZE);
- } else {
- ret = bch2_read_single_page(pages[nr_pages - 1], mapping);
- if (ret)
- goto out;
- }
- }
-
- while (reserved < len) {
- struct page *page = pages[(offset + reserved) >> PAGE_SHIFT];
- unsigned pg_offset = (offset + reserved) & (PAGE_SIZE - 1);
- unsigned pg_len = min_t(unsigned, len - reserved,
- PAGE_SIZE - pg_offset);
-retry_reservation:
- ret = bch2_page_reservation_get(c, inode, page, &res,
- pg_offset, pg_len, true);
-
- if (ret && !PageUptodate(page)) {
- ret = bch2_read_single_page(page, mapping);
- if (!ret)
- goto retry_reservation;
- }
-
- if (ret)
- goto out;
-
- reserved += pg_len;
- }
-
- if (mapping_writably_mapped(mapping))
- for (i = 0; i < nr_pages; i++)
- flush_dcache_page(pages[i]);
-
- while (copied < len) {
- struct page *page = pages[(offset + copied) >> PAGE_SHIFT];
- unsigned pg_offset = (offset + copied) & (PAGE_SIZE - 1);
- unsigned pg_len = min_t(unsigned, len - copied,
- PAGE_SIZE - pg_offset);
- unsigned pg_copied = iov_iter_copy_from_user_atomic(page,
- iter, pg_offset, pg_len);
-
- if (!pg_copied)
- break;
-
- if (!PageUptodate(page) &&
- pg_copied != PAGE_SIZE &&
- pos + copied + pg_copied < inode->v.i_size) {
- zero_user(page, 0, PAGE_SIZE);
- break;
- }
-
- flush_dcache_page(page);
- iov_iter_advance(iter, pg_copied);
- copied += pg_copied;
-
- if (pg_copied != pg_len)
- break;
- }
-
- if (!copied)
- goto out;
-
- 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);
-
- while (set_dirty < copied) {
- struct page *page = pages[(offset + set_dirty) >> PAGE_SHIFT];
- unsigned pg_offset = (offset + set_dirty) & (PAGE_SIZE - 1);
- unsigned pg_len = min_t(unsigned, copied - set_dirty,
- PAGE_SIZE - pg_offset);
-
- if (!PageUptodate(page))
- SetPageUptodate(page);
-
- bch2_set_page_dirty(c, inode, page, &res, pg_offset, pg_len);
- unlock_page(page);
- put_page(page);
-
- set_dirty += pg_len;
- }
-
- nr_pages_copied = DIV_ROUND_UP(offset + copied, PAGE_SIZE);
- inode->ei_last_dirtied = (unsigned long) current;
-out:
- for (i = nr_pages_copied; i < nr_pages; i++) {
- unlock_page(pages[i]);
- put_page(pages[i]);
- }
-
- bch2_page_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->ei_pagecache_lock);
-
- do {
- unsigned offset = pos & (PAGE_SIZE - 1);
- unsigned bytes = min_t(unsigned long, iov_iter_count(iter),
- PAGE_SIZE * WRITE_BATCH_PAGES - offset);
-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(iov_iter_fault_in_readable(iter, bytes))) {
- bytes = min_t(unsigned long, iov_iter_count(iter),
- PAGE_SIZE - offset);
-
- if (unlikely(iov_iter_fault_in_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->ei_pagecache_lock);
-
- 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, 0);
- 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 = io_opts(c, &inode->ei_inode);
- 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;
-
- 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(GFP_KERNEL,
- iov_iter_npages(iter, BIO_MAX_VECS),
- &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(GFP_KERNEL,
- iov_iter_npages(iter, BIO_MAX_VECS),
- &c->bio_read);
- bio->bi_end_io = bch2_direct_IO_read_split_endio;
-start:
- bio_set_op_attrs(bio, 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;
-
- ret = filemap_write_and_wait_range(mapping,
- iocb->ki_pos,
- iocb->ki_pos + count - 1);
- if (ret < 0)
- return ret;
-
- 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->ei_pagecache_lock);
- ret = generic_file_read_iter(iocb, iter);
- bch2_pagecache_add_put(&inode->ei_pagecache_lock);
- }
-
- return 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_cmp(bkey_start_pos(k.k), POS(inum.inum, end)) >= 0)
- 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 (err == -EINTR)
- goto retry;
- bch2_trans_exit(&trans);
-
- return err ? false : ret;
-}
-
-static void bch2_dio_write_loop_async(struct bch_write_op *);
-
-static long bch2_dio_write_loop(struct dio_write *dio)
-{
- bool kthread = (current->flags & PF_KTHREAD) != 0;
- struct kiocb *req = dio->req;
- struct address_space *mapping = req->ki_filp->f_mapping;
- struct bch_inode_info *inode = file_bch_inode(req->ki_filp);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct bio *bio = &dio->op.wbio.bio;
- struct bvec_iter_all iter;
- struct bio_vec *bv;
- unsigned unaligned, iter_count;
- bool sync = dio->sync, dropped_locks;
- long ret;
-
- if (dio->loop)
- goto loop;
-
- down(&c->io_in_flight);
-
- while (1) {
- iter_count = dio->iter.count;
-
- if (kthread)
- kthread_use_mm(dio->mm);
- BUG_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 (kthread)
- kthread_unuse_mm(dio->mm);
-
- /*
- * 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, io_opts(c, &inode->ei_inode));
- dio->op.end_io = bch2_dio_write_loop_async;
- dio->op.target = dio->op.opts.foreground_target;
- op_journal_seq_set(&dio->op, &inode->ei_journal_seq);
- 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);
-
- if ((req->ki_flags & IOCB_DSYNC) &&
- !c->opts.journal_flush_disabled)
- dio->op.flags |= BCH_WRITE_FLUSH;
- dio->op.flags |= BCH_WRITE_CHECK_ENOSPC;
-
- ret = bch2_disk_reservation_get(c, &dio->op.res, bio_sectors(bio),
- dio->op.opts.data_replicas, 0);
- if (unlikely(ret) &&
- !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))
- goto err;
-
- task_io_account_write(bio->bi_iter.bi_size);
-
- if (!dio->sync && !dio->loop && dio->iter.count) {
- struct iovec *iov = dio->inline_vecs;
-
- if (dio->iter.nr_segs > ARRAY_SIZE(dio->inline_vecs)) {
- iov = kmalloc(dio->iter.nr_segs * sizeof(*iov),
- GFP_KERNEL);
- if (unlikely(!iov)) {
- dio->sync = sync = true;
- goto do_io;
- }
-
- dio->free_iov = true;
- }
-
- memcpy(iov, dio->iter.iov, dio->iter.nr_segs * sizeof(*iov));
- dio->iter.iov = iov;
- }
-do_io:
- dio->loop = true;
- closure_call(&dio->op.cl, bch2_write, NULL, NULL);
-
- if (sync)
- wait_for_completion(&dio->done);
- else
- return -EIOCBQUEUED;
-loop:
- i_sectors_acct(c, inode, &dio->quota_res,
- dio->op.i_sectors_delta);
- req->ki_pos += (u64) dio->op.written << 9;
- dio->written += dio->op.written;
-
- 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 (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
- bio_for_each_segment_all(bv, bio, iter)
- put_page(bv->bv_page);
- bio->bi_vcnt = 0;
-
- if (dio->op.error) {
- set_bit(EI_INODE_ERROR, &inode->ei_flags);
- break;
- }
-
- if (!dio->iter.count)
- break;
-
- bio_reset(bio);
- reinit_completion(&dio->done);
- }
-
- ret = dio->op.error ?: ((long) dio->written << 9);
-err:
- up(&c->io_in_flight);
- bch2_pagecache_block_put(&inode->ei_pagecache_lock);
- bch2_quota_reservation_put(c, inode, &dio->quota_res);
-
- if (dio->free_iov)
- kfree(dio->iter.iov);
-
- if (likely(!bio_flagged(bio, BIO_NO_PAGE_REF)))
- bio_for_each_segment_all(bv, bio, iter)
- put_page(bv->bv_page);
- bio_put(bio);
-
- /* inode->i_dio_count is our ref on inode and thus bch_fs */
- inode_dio_end(&inode->v);
-
- if (!sync) {
- req->ki_complete(req, ret, 0);
- ret = -EIOCBQUEUED;
- }
- return ret;
-}
-
-static void bch2_dio_write_loop_async(struct bch_write_op *op)
-{
- struct dio_write *dio = container_of(op, struct dio_write, op);
-
- if (dio->sync)
- complete(&dio->done);
- else
- bch2_dio_write_loop(dio);
-}
-
-static noinline
-ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
-{
- 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->ei_pagecache_lock);
-
- extending = req->ki_pos + iter->count > inode->v.i_size;
- if (!extending) {
- inode_unlock(&inode->v);
- locked = false;
- }
-
- bio = bio_alloc_bioset(GFP_KERNEL,
- iov_iter_is_bvec(iter)
- ? 0
- : iov_iter_npages(iter, BIO_MAX_VECS),
- &c->dio_write_bioset);
- dio = container_of(bio, struct dio_write, op.wbio.bio);
- init_completion(&dio->done);
- dio->req = req;
- dio->mm = current->mm;
- dio->loop = false;
- dio->sync = is_sync_kiocb(req) || extending;
- dio->free_iov = false;
- dio->quota_res.sectors = 0;
- dio->written = 0;
- dio->iter = *iter;
-
- ret = bch2_quota_reservation_add(c, inode, &dio->quota_res,
- iter->count >> 9, true);
- if (unlikely(ret))
- goto err_put_bio;
-
- ret = write_invalidate_inode_pages_range(mapping,
- req->ki_pos,
- req->ki_pos + iter->count - 1);
- if (unlikely(ret))
- goto err_put_bio;
+ struct inode_new_size s = {
+ .new_size = new_size,
+ .now = bch2_current_time(c),
+ .fields = fields,
+ };
- ret = bch2_dio_write_loop(dio);
-err:
- if (locked)
- inode_unlock(&inode->v);
- return ret;
-err_put_bio:
- bch2_pagecache_block_put(&inode->ei_pagecache_lock);
- bch2_quota_reservation_put(c, inode, &dio->quota_res);
- bio_put(bio);
- inode_dio_end(&inode->v);
- goto err;
+ return bch2_write_inode(c, inode, inode_set_size, &s, fields);
}
-ssize_t bch2_write_iter(struct kiocb *iocb, struct iov_iter *from)
+void __bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
+ struct quota_res *quota_res, s64 sectors)
{
- struct file *file = iocb->ki_filp;
- struct bch_inode_info *inode = file_bch_inode(file);
- ssize_t ret;
+ 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;
- if (iocb->ki_flags & IOCB_DIRECT)
- return bch2_direct_write(iocb, from);
+#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);
- /* We can write back this queue in page reclaim */
- current->backing_dev_info = inode_to_bdi(&inode->v);
- inode_lock(&inode->v);
+ 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
+}
- ret = generic_write_checks(iocb, from);
- if (ret <= 0)
- goto unlock;
- ret = file_remove_privs(file);
- if (ret)
- goto unlock;
+/* fsync: */
- ret = file_update_time(file);
- if (ret)
- goto unlock;
+/*
+ * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an
+ * insert trigger: look up the btree inode instead
+ */
+static int bch2_flush_inode(struct bch_fs *c,
+ struct bch_inode_info *inode)
+{
+ struct bch_inode_unpacked u;
+ int ret;
- ret = bch2_buffered_write(iocb, from);
- if (likely(ret > 0))
- iocb->ki_pos += ret;
-unlock:
- inode_unlock(&inode->v);
- current->backing_dev_info = NULL;
+ if (c->opts.journal_flush_disabled)
+ return 0;
- if (ret > 0)
- ret = generic_write_sync(iocb, ret);
+ ret = bch2_inode_find_by_inum(c, inode_inum(inode), &u);
+ if (ret)
+ return ret;
- return ret;
+ return bch2_journal_flush_seq(&c->journal, u.bi_journal_seq) ?:
+ bch2_inode_flush_nocow_writes(c, inode);
}
-/* fsync: */
-
int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
struct bch_inode_info *inode = file_bch_inode(file);
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- int ret, ret2;
+ int ret, ret2, ret3;
ret = file_write_and_wait_range(file, start, end);
- if (ret)
- return ret;
-
- if (datasync && !(inode->v.i_state & I_DIRTY_DATASYNC))
- goto out;
-
- ret = sync_inode_metadata(&inode->v, 1);
- if (ret)
- return ret;
-out:
- if (!c->opts.journal_flush_disabled)
- ret = bch2_journal_flush_seq(&c->journal,
- inode->ei_journal_seq);
- ret2 = file_check_and_advance_wb_err(file);
+ ret2 = sync_inode_metadata(&inode->v, 1);
+ ret3 = bch2_flush_inode(c, inode);
- return ret ?: ret2;
+ return bch2_err_class(ret ?: ret2 ?: ret3);
}
/* truncate: */
if (ret)
goto err;
- for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents, start, 0, k, ret) {
- if (bkey_cmp(bkey_start_pos(k.k), end) >= 0)
- break;
-
- if (bkey_extent_is_data(k.k)) {
+ 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);
err:
- if (ret == -EINTR)
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
bch2_trans_exit(&trans);
return ret;
}
-static int __bch2_truncate_page(struct bch_inode_info *inode,
- pgoff_t index, loff_t start, loff_t end)
+static int __bch2_truncate_folio(struct bch_inode_info *inode,
+ pgoff_t index, loff_t start, loff_t end)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct address_space *mapping = inode->v.i_mapping;
- struct bch_page_state *s;
+ struct bch_folio *s;
unsigned start_offset = start & (PAGE_SIZE - 1);
unsigned end_offset = ((end - 1) & (PAGE_SIZE - 1)) + 1;
unsigned i;
- struct page *page;
+ struct folio *folio;
+ s64 i_sectors_delta = 0;
int ret = 0;
+ u64 end_pos;
- /* Page boundary? Nothing to do */
- if (!((index == start >> PAGE_SHIFT && start_offset) ||
- (index == end >> PAGE_SHIFT && end_offset != PAGE_SIZE)))
- return 0;
-
- /* Above i_size? */
- if (index << PAGE_SHIFT >= inode->v.i_size)
- return 0;
-
- page = find_lock_page(mapping, index);
- if (!page) {
+ folio = filemap_lock_folio(mapping, index);
+ if (IS_ERR_OR_NULL(folio)) {
/*
* XXX: we're doing two index lookups when we end up reading the
- * page
+ * folio
*/
ret = range_has_data(c, inode->ei_subvol,
- POS(inode->v.i_ino, index << PAGE_SECTOR_SHIFT),
- POS(inode->v.i_ino, (index + 1) << PAGE_SECTOR_SHIFT));
+ POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT)),
+ POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT) + PAGE_SECTORS));
if (ret <= 0)
return ret;
- page = find_or_create_page(mapping, index, GFP_KERNEL);
- if (unlikely(!page)) {
+ folio = __filemap_get_folio(mapping, index,
+ FGP_LOCK|FGP_CREAT, GFP_KERNEL);
+ if (unlikely(IS_ERR_OR_NULL(folio))) {
ret = -ENOMEM;
goto out;
}
}
- s = bch2_page_state_create(page, 0);
+ BUG_ON(start >= folio_end_pos(folio));
+ BUG_ON(end <= folio_pos(folio));
+
+ start_offset = max(start, folio_pos(folio)) - folio_pos(folio);
+ end_offset = min_t(u64, end, folio_end_pos(folio)) - folio_pos(folio);
+
+ /* Folio boundary? Nothing to do */
+ if (start_offset == 0 &&
+ end_offset == folio_size(folio)) {
+ ret = 0;
+ goto unlock;
+ }
+
+ s = bch2_folio_create(folio, 0);
if (!s) {
ret = -ENOMEM;
goto unlock;
}
- if (!PageUptodate(page)) {
- ret = bch2_read_single_page(page, mapping);
+ if (!folio_test_uptodate(folio)) {
+ ret = bch2_read_single_folio(folio, mapping);
if (ret)
goto unlock;
}
- if (index != start >> PAGE_SHIFT)
- start_offset = 0;
- if (index != end >> PAGE_SHIFT)
- end_offset = PAGE_SIZE;
+ ret = bch2_folio_set(c, inode_inum(inode), &folio, 1);
+ if (ret)
+ goto unlock;
for (i = round_up(start_offset, block_bytes(c)) >> 9;
i < round_down(end_offset, block_bytes(c)) >> 9;
i++) {
s->s[i].nr_replicas = 0;
- s->s[i].state = SECTOR_UNALLOCATED;
+
+ i_sectors_delta -= s->s[i].state == SECTOR_dirty;
+ bch2_folio_sector_set(folio, s, i, SECTOR_unallocated);
}
- zero_user_segment(page, start_offset, end_offset);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
+
+ /*
+ * Caller needs to know whether this folio will be written out by
+ * writeback - doing an i_size update if necessary - or whether it will
+ * be responsible for the i_size update.
+ *
+ * Note that we shouldn't ever see a folio beyond EOF, but check and
+ * warn if so. This has been observed by failure to clean up folios
+ * after a short write and there's still a chance reclaim will fix
+ * things up.
+ */
+ WARN_ON_ONCE(folio_pos(folio) >= inode->v.i_size);
+ end_pos = folio_end_pos(folio);
+ if (inode->v.i_size > folio_pos(folio))
+ end_pos = min_t(u64, inode->v.i_size, end_pos);
+ ret = s->s[folio_pos_to_s(folio, end_pos - 1)].state >= SECTOR_dirty;
+
+ folio_zero_segment(folio, start_offset, end_offset);
/*
* Bit of a hack - we don't want truncate to fail due to -ENOSPC.
*
- * XXX: because we aren't currently tracking whether the page has actual
+ * XXX: because we aren't currently tracking whether the folio has actual
* data in it (vs. just 0s, or only partially written) this wrong. ick.
*/
- ret = bch2_get_page_disk_reservation(c, inode, page, false);
- BUG_ON(ret);
+ BUG_ON(bch2_get_folio_disk_reservation(c, inode, folio, false));
/*
* This removes any writeable userspace mappings; we need to force
* .page_mkwrite to be called again before any mmapped writes, to
* redirty the full page:
*/
- page_mkclean(page);
- __set_page_dirty_nobuffers(page);
+ folio_mkclean(folio);
+ filemap_dirty_folio(mapping, folio);
unlock:
- unlock_page(page);
- put_page(page);
+ folio_unlock(folio);
+ folio_put(folio);
out:
return ret;
}
-static int bch2_truncate_page(struct bch_inode_info *inode, loff_t from)
+static int bch2_truncate_folio(struct bch_inode_info *inode, loff_t from)
+{
+ return __bch2_truncate_folio(inode, from >> PAGE_SHIFT,
+ from, ANYSINT_MAX(loff_t));
+}
+
+static int bch2_truncate_folios(struct bch_inode_info *inode,
+ loff_t start, loff_t end)
{
- return __bch2_truncate_page(inode, from >> PAGE_SHIFT,
- from, round_up(from, PAGE_SIZE));
+ int ret = __bch2_truncate_folio(inode, start >> PAGE_SHIFT,
+ start, end);
+
+ if (ret >= 0 &&
+ start >> PAGE_SHIFT != end >> PAGE_SHIFT)
+ ret = __bch2_truncate_folio(inode,
+ (end - 1) >> PAGE_SHIFT,
+ start, end);
+ return ret;
}
-static int bch2_extend(struct user_namespace *mnt_userns,
+static int bch2_extend(struct mnt_idmap *idmap,
struct bch_inode_info *inode,
struct bch_inode_unpacked *inode_u,
struct iattr *iattr)
truncate_setsize(&inode->v, iattr->ia_size);
- return bch2_setattr_nonsize(mnt_userns, inode, iattr);
+ return bch2_setattr_nonsize(idmap, inode, iattr);
}
static int bch2_truncate_finish_fn(struct bch_inode_info *inode,
return 0;
}
-int bch2_truncate(struct user_namespace *mnt_userns,
+int bch2_truncate(struct mnt_idmap *idmap,
struct bch_inode_info *inode, struct iattr *iattr)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
}
inode_dio_wait(&inode->v);
- bch2_pagecache_block_get(&inode->ei_pagecache_lock);
+ bch2_pagecache_block_get(inode);
ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);
if (ret)
if (ret)
goto err;
- WARN_ON(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
- inode->v.i_size < inode_u.bi_size);
+ WARN_ONCE(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
+ inode->v.i_size < inode_u.bi_size,
+ "truncate spotted in mem i_size < btree i_size: %llu < %llu\n",
+ (u64) inode->v.i_size, inode_u.bi_size);
if (iattr->ia_size > inode->v.i_size) {
- ret = bch2_extend(mnt_userns, inode, &inode_u, iattr);
+ ret = bch2_extend(idmap, inode, &inode_u, iattr);
goto err;
}
iattr->ia_valid &= ~ATTR_SIZE;
- ret = bch2_truncate_page(inode, iattr->ia_size);
- if (unlikely(ret))
+ ret = bch2_truncate_folio(inode, iattr->ia_size);
+ if (unlikely(ret < 0))
goto err;
/*
ret = bch2_fpunch(c, inode_inum(inode),
round_up(iattr->ia_size, block_bytes(c)) >> 9,
- U64_MAX, &inode->ei_journal_seq, &i_sectors_delta);
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
-
+ U64_MAX, &i_sectors_delta);
+ bch2_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;
ret = bch2_write_inode(c, inode, bch2_truncate_finish_fn, NULL, 0);
mutex_unlock(&inode->ei_update_lock);
- ret = bch2_setattr_nonsize(mnt_userns, inode, iattr);
+ ret = bch2_setattr_nonsize(idmap, inode, iattr);
err:
- bch2_pagecache_block_put(&inode->ei_pagecache_lock);
- return ret;
+ bch2_pagecache_block_put(inode);
+ return bch2_err_class(ret);
}
/* fallocate: */
static long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- u64 discard_start = round_up(offset, block_bytes(c)) >> 9;
- u64 discard_end = round_down(offset + len, block_bytes(c)) >> 9;
+ u64 end = offset + len;
+ u64 block_start = round_up(offset, block_bytes(c));
+ u64 block_end = round_down(end, block_bytes(c));
+ bool truncated_last_page;
int ret = 0;
- inode_lock(&inode->v);
- inode_dio_wait(&inode->v);
- bch2_pagecache_block_get(&inode->ei_pagecache_lock);
-
- ret = __bch2_truncate_page(inode,
- offset >> PAGE_SHIFT,
- offset, offset + len);
- if (unlikely(ret))
+ ret = bch2_truncate_folios(inode, offset, end);
+ if (unlikely(ret < 0))
goto err;
- if (offset >> PAGE_SHIFT !=
- (offset + len) >> PAGE_SHIFT) {
- ret = __bch2_truncate_page(inode,
- (offset + len) >> PAGE_SHIFT,
- offset, offset + len);
- if (unlikely(ret))
- goto err;
- }
+ truncated_last_page = ret;
- truncate_pagecache_range(&inode->v, offset, offset + len - 1);
+ truncate_pagecache_range(&inode->v, offset, end - 1);
- if (discard_start < discard_end) {
+ if (block_start < block_end) {
s64 i_sectors_delta = 0;
ret = bch2_fpunch(c, inode_inum(inode),
- discard_start, discard_end,
- &inode->ei_journal_seq,
+ 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);
- ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
- ATTR_MTIME|ATTR_CTIME) ?: ret;
+ if (end >= inode->v.i_size && !truncated_last_page) {
+ ret = bch2_write_inode_size(c, inode, inode->v.i_size,
+ ATTR_MTIME|ATTR_CTIME);
+ } else {
+ ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
+ ATTR_MTIME|ATTR_CTIME);
+ }
mutex_unlock(&inode->ei_update_lock);
err:
- bch2_pagecache_block_put(&inode->ei_pagecache_lock);
- inode_unlock(&inode->v);
-
return ret;
}
if ((offset | len) & (block_bytes(c) - 1))
return -EINVAL;
- /*
- * We need i_mutex to keep the page cache consistent with the extents
- * btree, and the btree consistent with i_size - we don't need outside
- * locking for the extents btree itself, because we're using linked
- * iterators
- */
- inode_lock(&inode->v);
- inode_dio_wait(&inode->v);
- bch2_pagecache_block_get(&inode->ei_pagecache_lock);
-
if (insert) {
- ret = -EFBIG;
if (inode->v.i_sb->s_maxbytes - inode->v.i_size < len)
- goto err;
+ return -EFBIG;
- ret = -EINVAL;
if (offset >= inode->v.i_size)
- goto err;
+ return -EINVAL;
src_start = U64_MAX;
shift = len;
} else {
- ret = -EINVAL;
if (offset + len >= inode->v.i_size)
- goto err;
+ 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)
- goto err;
+ return ret;
if (insert) {
i_size_write(&inode->v, new_size);
ret = bch2_fpunch(c, inode_inum(inode),
offset >> 9, (offset + len) >> 9,
- &inode->ei_journal_seq,
&i_sectors_delta);
- i_sectors_acct(c, inode, NULL, i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
if (ret)
- goto err;
+ return ret;
}
bch2_bkey_buf_init(©);
bch2_trans_copy_iter(&dst, &src);
bch2_trans_copy_iter(&del, &src);
- while (ret == 0 || ret == -EINTR) {
+ 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;
k = insert
? bch2_btree_iter_peek_prev(&src)
- : bch2_btree_iter_peek(&src);
+ : bch2_btree_iter_peek_upto(&src, POS(inode->v.i_ino, U64_MAX));
if ((ret = bkey_err(k)))
continue;
break;
if (insert &&
- bkey_cmp(k.k->p, POS(inode->v.i_ino, offset >> 9)) <= 0)
+ bkey_le(k.k->p, POS(inode->v.i_ino, offset >> 9)))
break;
reassemble:
bch2_bkey_buf_reassemble(©, c, k);
if (insert &&
- bkey_cmp(bkey_start_pos(k.k), move_pos) < 0)
+ bkey_lt(bkey_start_pos(k.k), move_pos))
bch2_cut_front(move_pos, copy.k);
copy.k->k.p.offset += shift >> 9;
if (ret)
continue;
- if (bkey_cmp(atomic_end, copy.k->k.p)) {
+ if (!bkey_eq(atomic_end, copy.k->k.p)) {
if (insert) {
move_pos = atomic_end;
move_pos.offset -= shift >> 9;
next_pos = insert ? bkey_start_pos(&delete.k) : delete.k.p;
- if (copy.k->k.size == k.k->size) {
- /*
- * If we're moving the entire extent, we can skip
- * running triggers:
- */
- trigger_flags |= BTREE_TRIGGER_NORUN;
- } else {
+ 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_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,
- &inode->ei_journal_seq,
+ bch2_trans_commit(&trans, &disk_res, NULL,
BTREE_INSERT_NOFAIL);
bch2_disk_reservation_put(c, &disk_res);
bch2_bkey_buf_exit(©, c);
if (ret)
- goto err;
+ return ret;
+ mutex_lock(&inode->ei_update_lock);
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 {
+ /* 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);
}
-err:
- bch2_pagecache_block_put(&inode->ei_pagecache_lock);
- inode_unlock(&inode->v);
+ mutex_unlock(&inode->ei_update_lock);
return ret;
}
struct btree_trans trans;
struct btree_iter iter;
struct bpos end_pos = POS(inode->v.i_ino, end_sector);
- unsigned replicas = io_opts(c, &inode->ei_inode).data_replicas;
+ 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,
POS(inode->v.i_ino, start_sector),
BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
- while (!ret && bkey_cmp(iter.pos, end_pos) < 0) {
+ while (!ret && bkey_lt(iter.pos, end_pos)) {
s64 i_sectors_delta = 0;
- struct disk_reservation disk_res = { 0 };
struct quota_res quota_res = { 0 };
- struct bkey_i_reservation reservation;
struct bkey_s_c k;
unsigned sectors;
+ bool is_allocation;
+ u64 hole_start, hole_end;
u32 snapshot;
bch2_trans_begin(&trans);
if ((ret = bkey_err(k)))
goto bkey_err;
+ hole_start = iter.pos.offset;
+ hole_end = bpos_min(k.k->p, end_pos).offset;
+ is_allocation = bkey_extent_is_allocation(k.k);
+
/* already reserved */
- if (k.k->type == KEY_TYPE_reservation &&
- bkey_s_c_to_reservation(k).v->nr_replicas >= replicas) {
+ if (bkey_extent_is_reservation(k) &&
+ bch2_bkey_nr_ptrs_fully_allocated(k) >= opts.data_replicas) {
bch2_btree_iter_advance(&iter);
continue;
}
continue;
}
- bkey_reservation_init(&reservation.k_i);
- reservation.k.type = KEY_TYPE_reservation;
- reservation.k.p = k.k->p;
- reservation.k.size = k.k->size;
+ 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,
+ (bch2_clamp_data_hole(&inode->v,
+ &hole_start,
+ &hole_end,
+ opts.data_replicas, false), 0));
+ bch2_btree_iter_set_pos(&iter, POS(iter.pos.inode, hole_start));
+
+ if (ret)
+ goto bkey_err;
- bch2_cut_front(iter.pos, &reservation.k_i);
- bch2_cut_back(end_pos, &reservation.k_i);
+ if (hole_start == hole_end)
+ continue;
+ }
- sectors = reservation.k.size;
- reservation.v.nr_replicas = bch2_bkey_nr_ptrs_allocated(k);
+ sectors = hole_end - hole_start;
- if (!bkey_extent_is_allocation(k.k)) {
+ if (!is_allocation) {
ret = bch2_quota_reservation_add(c, inode,
- "a_res,
- sectors, true);
+ "a_res, sectors, true);
if (unlikely(ret))
goto bkey_err;
}
- if (reservation.v.nr_replicas < replicas ||
- bch2_bkey_sectors_compressed(k)) {
- ret = bch2_disk_reservation_get(c, &disk_res, sectors,
- replicas, 0);
- if (unlikely(ret))
- goto bkey_err;
+ ret = bch2_extent_fallocate(&trans, inode_inum(inode), &iter,
+ sectors, opts, &i_sectors_delta,
+ writepoint_hashed((unsigned long) current));
+ if (ret)
+ goto bkey_err;
- reservation.v.nr_replicas = disk_res.nr_replicas;
- }
+ bch2_i_sectors_acct(c, inode, "a_res, i_sectors_delta);
- ret = bch2_extent_update(&trans, inode_inum(inode), &iter,
- &reservation.k_i,
- &disk_res, &inode->ei_journal_seq,
- 0, &i_sectors_delta, true);
- i_sectors_acct(c, inode, "a_res, i_sectors_delta);
+ 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);
- bch2_disk_reservation_put(c, &disk_res);
- if (ret == -EINTR)
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
ret = 0;
}
+
+ if (bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)) {
+ struct quota_res quota_res = { 0 };
+ s64 i_sectors_delta = 0;
+
+ bch2_fpunch_at(&trans, &iter, inode_inum(inode),
+ end_sector, &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);
return ret;
static long bchfs_fallocate(struct bch_inode_info *inode, int mode,
loff_t offset, loff_t len)
{
- struct address_space *mapping = inode->v.i_mapping;
struct bch_fs *c = inode->v.i_sb->s_fs_info;
- loff_t end = offset + len;
- loff_t block_start = round_down(offset, block_bytes(c));
- loff_t block_end = round_up(end, block_bytes(c));
- int ret;
-
- inode_lock(&inode->v);
- inode_dio_wait(&inode->v);
- bch2_pagecache_block_get(&inode->ei_pagecache_lock);
+ u64 end = offset + len;
+ u64 block_start = round_down(offset, block_bytes(c));
+ u64 block_end = round_up(end, block_bytes(c));
+ bool truncated_last_page = false;
+ int ret, ret2 = 0;
if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {
ret = inode_newsize_ok(&inode->v, end);
if (ret)
- goto err;
+ return ret;
}
if (mode & FALLOC_FL_ZERO_RANGE) {
- ret = __bch2_truncate_page(inode,
- offset >> PAGE_SHIFT,
- offset, end);
-
- if (!ret &&
- offset >> PAGE_SHIFT != end >> PAGE_SHIFT)
- ret = __bch2_truncate_page(inode,
- end >> PAGE_SHIFT,
- offset, end);
+ ret = bch2_truncate_folios(inode, offset, end);
+ if (unlikely(ret < 0))
+ return ret;
- if (unlikely(ret))
- goto err;
+ truncated_last_page = ret;
truncate_pagecache_range(&inode->v, offset, end - 1);
+
+ block_start = round_up(offset, block_bytes(c));
+ block_end = round_down(end, block_bytes(c));
}
ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);
- if (ret)
- goto err;
/*
- * Do we need to extend the file?
- *
- * If we zeroed up to the end of the file, we dropped whatever writes
- * were going to write out the current i_size, so we have to extend
- * manually even if FL_KEEP_SIZE was set:
+ * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,
+ * so that the VFS cache i_size is consistent with the btree i_size:
*/
- if (end >= inode->v.i_size &&
- (!(mode & FALLOC_FL_KEEP_SIZE) ||
- (mode & FALLOC_FL_ZERO_RANGE))) {
+ if (ret &&
+ !(bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)))
+ return ret;
- /*
- * Sync existing appends before extending i_size,
- * as in bch2_extend():
- */
- ret = filemap_write_and_wait_range(mapping,
- inode->ei_inode.bi_size, S64_MAX);
- if (ret)
- goto err;
+ if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)
+ end = inode->v.i_size;
- if (mode & FALLOC_FL_KEEP_SIZE)
- end = inode->v.i_size;
- else
- i_size_write(&inode->v, end);
+ if (end >= inode->v.i_size &&
+ (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||
+ !(mode & FALLOC_FL_KEEP_SIZE))) {
+ spin_lock(&inode->v.i_lock);
+ i_size_write(&inode->v, end);
+ spin_unlock(&inode->v.i_lock);
mutex_lock(&inode->ei_update_lock);
- ret = bch2_write_inode_size(c, inode, end, 0);
+ ret2 = bch2_write_inode_size(c, inode, end, 0);
mutex_unlock(&inode->ei_update_lock);
}
-err:
- bch2_pagecache_block_put(&inode->ei_pagecache_lock);
- inode_unlock(&inode->v);
- return ret;
+
+ return ret ?: ret2;
}
long bch2_fallocate_dispatch(struct file *file, int mode,
struct bch_fs *c = inode->v.i_sb->s_fs_info;
long ret;
- if (!percpu_ref_tryget(&c->writes))
+ if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_fallocate))
return -EROFS;
+ inode_lock(&inode->v);
+ inode_dio_wait(&inode->v);
+ bch2_pagecache_block_get(inode);
+
+ ret = file_modified(file);
+ if (ret)
+ goto err;
+
if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
ret = bchfs_fallocate(inode, mode, offset, len);
else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
ret = bchfs_fcollapse_finsert(inode, offset, len, false);
else
ret = -EOPNOTSUPP;
+err:
+ bch2_pagecache_block_put(inode);
+ inode_unlock(&inode->v);
+ bch2_write_ref_put(c, BCH_WRITE_REF_fallocate);
- percpu_ref_put(&c->writes);
-
- return ret;
+ return bch2_err_class(ret);
}
-static void mark_range_unallocated(struct bch_inode_info *inode,
- loff_t start, loff_t end)
+/*
+ * Take a quota reservation for unallocated blocks in a given file range
+ * Does not check pagecache
+ */
+static int quota_reserve_range(struct bch_inode_info *inode,
+ struct quota_res *res,
+ u64 start, u64 end)
{
- pgoff_t index = start >> PAGE_SHIFT;
- pgoff_t end_index = (end - 1) >> PAGE_SHIFT;
- struct pagevec pvec;
-
- pagevec_init(&pvec);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ u32 snapshot;
+ u64 sectors = end - start;
+ u64 pos = start;
+ int ret;
- do {
- unsigned nr_pages, i, j;
+ bch2_trans_init(&trans, c, 0, 0);
+retry:
+ bch2_trans_begin(&trans);
- nr_pages = pagevec_lookup_range(&pvec, inode->v.i_mapping,
- &index, end_index);
- if (nr_pages == 0)
- break;
+ ret = bch2_subvolume_get_snapshot(&trans, inode->ei_subvol, &snapshot);
+ if (ret)
+ goto err;
- for (i = 0; i < nr_pages; i++) {
- struct page *page = pvec.pages[i];
- struct bch_page_state *s;
+ 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)) &&
+ (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)) {
+ u64 s = min(end, k.k->p.offset) -
+ max(start, bkey_start_offset(k.k));
+ BUG_ON(s > sectors);
+ sectors -= s;
+ }
+ bch2_btree_iter_advance(&iter);
+ }
+ pos = iter.pos.offset;
+ bch2_trans_iter_exit(&trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
- lock_page(page);
- s = bch2_page_state(page);
+ bch2_trans_exit(&trans);
- if (s) {
- spin_lock(&s->lock);
- for (j = 0; j < PAGE_SECTORS; j++)
- s->s[j].nr_replicas = 0;
- spin_unlock(&s->lock);
- }
+ if (ret)
+ return ret;
- unlock_page(page);
- }
- pagevec_release(&pvec);
- } while (index <= end_index);
+ return bch2_quota_reservation_add(c, inode, res, sectors, true);
}
loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
struct bch_inode_info *src = file_bch_inode(file_src);
struct bch_inode_info *dst = file_bch_inode(file_dst);
struct bch_fs *c = src->v.i_sb->s_fs_info;
+ struct quota_res quota_res = { 0 };
s64 i_sectors_delta = 0;
u64 aligned_len;
loff_t ret = 0;
bch2_lock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
- file_update_time(file_dst);
-
inode_dio_wait(&src->v);
inode_dio_wait(&dst->v);
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;
- mark_range_unallocated(src, pos_src, pos_src + aligned_len);
+ ret = quota_reserve_range(dst, "a_res, pos_dst >> 9,
+ (pos_dst + aligned_len) >> 9);
+ if (ret)
+ goto err;
+
+ file_update_time(file_dst);
+
+ bch2_mark_pagecache_unallocated(src, pos_src >> 9,
+ (pos_src + aligned_len) >> 9);
ret = bch2_remap_range(c,
inode_inum(dst), pos_dst >> 9,
inode_inum(src), pos_src >> 9,
aligned_len >> 9,
- &dst->ei_journal_seq,
pos_dst + len, &i_sectors_delta);
if (ret < 0)
goto err;
*/
ret = min((u64) ret << 9, (u64) len);
- /* XXX get a quota reservation */
- i_sectors_acct(c, dst, NULL, 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)
i_size_write(&dst->v, pos_dst + ret);
spin_unlock(&dst->v.i_lock);
- if (((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
- IS_SYNC(file_inode(file_dst))) &&
- !c->opts.journal_flush_disabled)
- ret = bch2_journal_flush_seq(&c->journal, dst->ei_journal_seq);
+ if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
+ IS_SYNC(file_inode(file_dst)))
+ ret = bch2_flush_inode(c, dst);
err:
+ bch2_quota_reservation_put(c, dst, "a_res);
bch2_unlock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
- return ret;
+ return bch2_err_class(ret);
}
/* fseek: */
-static int page_data_offset(struct page *page, unsigned offset)
-{
- struct bch_page_state *s = bch2_page_state(page);
- unsigned i;
-
- if (s)
- for (i = offset >> 9; i < PAGE_SECTORS; i++)
- if (s->s[i].state >= SECTOR_DIRTY)
- return i << 9;
-
- return -1;
-}
-
-static loff_t bch2_seek_pagecache_data(struct inode *vinode,
- loff_t start_offset,
- loff_t end_offset)
-{
- struct address_space *mapping = vinode->i_mapping;
- struct page *page;
- pgoff_t start_index = start_offset >> PAGE_SHIFT;
- pgoff_t end_index = end_offset >> PAGE_SHIFT;
- pgoff_t index = start_index;
- loff_t ret;
- int offset;
-
- while (index <= end_index) {
- if (find_get_pages_range(mapping, &index, end_index, 1, &page)) {
- lock_page(page);
-
- offset = page_data_offset(page,
- page->index == start_index
- ? start_offset & (PAGE_SIZE - 1)
- : 0);
- if (offset >= 0) {
- ret = clamp(((loff_t) page->index << PAGE_SHIFT) +
- offset,
- start_offset, end_offset);
- unlock_page(page);
- put_page(page);
- return ret;
- }
-
- unlock_page(page);
- put_page(page);
- } else {
- break;
- }
- }
-
- return end_offset;
-}
-
static loff_t bch2_seek_data(struct file *file, u64 offset)
{
struct bch_inode_info *inode = file_bch_inode(file);
if (ret)
goto err;
- for_each_btree_key_norestart(&trans, iter, BTREE_ID_extents,
- SPOS(inode->v.i_ino, offset >> 9, snapshot), 0, k, ret) {
- if (k.k->p.inode != inode->v.i_ino) {
- break;
- } else if (bkey_extent_is_data(k.k)) {
+ 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) {
+ if (bkey_extent_is_data(k.k)) {
next_data = max(offset, bkey_start_offset(k.k) << 9);
break;
} else if (k.k->p.offset >> 9 > isize)
}
bch2_trans_iter_exit(&trans, &iter);
err:
- if (ret == -EINTR)
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
bch2_trans_exit(&trans);
if (next_data > offset)
next_data = bch2_seek_pagecache_data(&inode->v,
- offset, next_data);
+ offset, next_data, 0, false);
if (next_data >= isize)
return -ENXIO;
return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
}
-static int __page_hole_offset(struct page *page, unsigned offset)
-{
- struct bch_page_state *s = bch2_page_state(page);
- unsigned i;
-
- if (!s)
- return 0;
-
- for (i = offset >> 9; i < PAGE_SECTORS; i++)
- if (s->s[i].state < SECTOR_DIRTY)
- return i << 9;
-
- return -1;
-}
-
-static loff_t page_hole_offset(struct address_space *mapping, loff_t offset)
-{
- pgoff_t index = offset >> PAGE_SHIFT;
- struct page *page;
- int pg_offset;
- loff_t ret = -1;
-
- page = find_lock_page(mapping, index);
- if (!page)
- return offset;
-
- pg_offset = __page_hole_offset(page, offset & (PAGE_SIZE - 1));
- if (pg_offset >= 0)
- ret = ((loff_t) index << PAGE_SHIFT) + pg_offset;
-
- unlock_page(page);
-
- return ret;
-}
-
-static loff_t bch2_seek_pagecache_hole(struct inode *vinode,
- loff_t start_offset,
- loff_t end_offset)
-{
- struct address_space *mapping = vinode->i_mapping;
- loff_t offset = start_offset, hole;
-
- while (offset < end_offset) {
- hole = page_hole_offset(mapping, offset);
- if (hole >= 0 && hole <= end_offset)
- return max(start_offset, hole);
-
- offset += PAGE_SIZE;
- offset &= PAGE_MASK;
- }
-
- return end_offset;
-}
-
static loff_t bch2_seek_hole(struct file *file, u64 offset)
{
struct bch_inode_info *inode = file_bch_inode(file);
BTREE_ITER_SLOTS, k, ret) {
if (k.k->p.inode != inode->v.i_ino) {
next_hole = bch2_seek_pagecache_hole(&inode->v,
- offset, MAX_LFS_FILESIZE);
+ offset, MAX_LFS_FILESIZE, 0, false);
break;
} else if (!bkey_extent_is_data(k.k)) {
next_hole = bch2_seek_pagecache_hole(&inode->v,
max(offset, bkey_start_offset(k.k) << 9),
- k.k->p.offset << 9);
+ k.k->p.offset << 9, 0, false);
if (next_hole < k.k->p.offset << 9)
break;
}
bch2_trans_iter_exit(&trans, &iter);
err:
- if (ret == -EINTR)
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
bch2_trans_exit(&trans);
loff_t bch2_llseek(struct file *file, loff_t offset, int whence)
{
+ loff_t ret;
+
switch (whence) {
case SEEK_SET:
case SEEK_CUR:
case SEEK_END:
- return generic_file_llseek(file, offset, whence);
+ ret = generic_file_llseek(file, offset, whence);
+ break;
case SEEK_DATA:
- return bch2_seek_data(file, offset);
+ ret = bch2_seek_data(file, offset);
+ break;
case SEEK_HOLE:
- return bch2_seek_hole(file, offset);
+ ret = bch2_seek_hole(file, offset);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
}
- return -EINVAL;
+ return bch2_err_class(ret);
}
void bch2_fs_fsio_exit(struct bch_fs *c)
{
- bioset_exit(&c->dio_write_bioset);
- bioset_exit(&c->dio_read_bioset);
- bioset_exit(&c->writepage_bioset);
+ bioset_exit(&c->nocow_flush_bioset);
}
int bch2_fs_fsio_init(struct bch_fs *c)
{
- int ret = 0;
+ if (bioset_init(&c->nocow_flush_bioset,
+ 1, offsetof(struct nocow_flush, bio), 0))
+ return -BCH_ERR_ENOMEM_nocow_flush_bioset_init;
- pr_verbose_init(c->opts, "");
-
- if (bioset_init(&c->writepage_bioset,
- 4, offsetof(struct bch_writepage_io, op.wbio.bio),
- BIOSET_NEED_BVECS) ||
- bioset_init(&c->dio_read_bioset,
- 4, offsetof(struct dio_read, rbio.bio),
- BIOSET_NEED_BVECS) ||
- bioset_init(&c->dio_write_bioset,
- 4, offsetof(struct dio_write, op.wbio.bio),
- BIOSET_NEED_BVECS))
- ret = -ENOMEM;
-
- pr_verbose_init(c->opts, "ret %i", ret);
- return ret;
+ return 0;
}
#endif /* NO_BCACHEFS_FS */
projects / bcachefs-tools-debian / blobdiff