diff options
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r-- | fs/btrfs/extent-tree.c | 58 |
1 files changed, 43 insertions, 15 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 32312e0..c6b6a6e 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -549,7 +549,7 @@ static int cache_block_group(struct btrfs_block_group_cache *cache, caching_ctl->block_group = cache; caching_ctl->progress = cache->key.objectid; atomic_set(&caching_ctl->count, 1); - caching_ctl->work.func = caching_thread; + btrfs_init_work(&caching_ctl->work, caching_thread, NULL, NULL); spin_lock(&cache->lock); /* @@ -640,7 +640,7 @@ static int cache_block_group(struct btrfs_block_group_cache *cache, btrfs_get_block_group(cache); - btrfs_queue_worker(&fs_info->caching_workers, &caching_ctl->work); + btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); return ret; } @@ -3971,7 +3971,7 @@ static int can_overcommit(struct btrfs_root *root, } static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, - unsigned long nr_pages) + unsigned long nr_pages, int nr_items) { struct super_block *sb = root->fs_info->sb; @@ -3986,9 +3986,9 @@ static void btrfs_writeback_inodes_sb_nr(struct btrfs_root *root, * the filesystem is readonly(all dirty pages are written to * the disk). */ - btrfs_start_delalloc_roots(root->fs_info, 0); + btrfs_start_delalloc_roots(root->fs_info, 0, nr_items); if (!current->journal_info) - btrfs_wait_ordered_roots(root->fs_info, -1); + btrfs_wait_ordered_roots(root->fs_info, nr_items); } } @@ -4045,7 +4045,7 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, while (delalloc_bytes && loops < 3) { max_reclaim = min(delalloc_bytes, to_reclaim); nr_pages = max_reclaim >> PAGE_CACHE_SHIFT; - btrfs_writeback_inodes_sb_nr(root, nr_pages); + btrfs_writeback_inodes_sb_nr(root, nr_pages, items); /* * We need to wait for the async pages to actually start before * we do anything. @@ -4112,13 +4112,9 @@ static int may_commit_transaction(struct btrfs_root *root, goto commit; /* See if there is enough pinned space to make this reservation */ - spin_lock(&space_info->lock); if (percpu_counter_compare(&space_info->total_bytes_pinned, - bytes) >= 0) { - spin_unlock(&space_info->lock); + bytes) >= 0) goto commit; - } - spin_unlock(&space_info->lock); /* * See if there is some space in the delayed insertion reservation for @@ -4127,16 +4123,13 @@ static int may_commit_transaction(struct btrfs_root *root, if (space_info != delayed_rsv->space_info) return -ENOSPC; - spin_lock(&space_info->lock); spin_lock(&delayed_rsv->lock); if (percpu_counter_compare(&space_info->total_bytes_pinned, bytes - delayed_rsv->size) >= 0) { spin_unlock(&delayed_rsv->lock); - spin_unlock(&space_info->lock); return -ENOSPC; } spin_unlock(&delayed_rsv->lock); - spin_unlock(&space_info->lock); commit: trans = btrfs_join_transaction(root); @@ -4181,7 +4174,7 @@ static int flush_space(struct btrfs_root *root, break; case FLUSH_DELALLOC: case FLUSH_DELALLOC_WAIT: - shrink_delalloc(root, num_bytes, orig_bytes, + shrink_delalloc(root, num_bytes * 2, orig_bytes, state == FLUSH_DELALLOC_WAIT); break; case ALLOC_CHUNK: @@ -8938,3 +8931,38 @@ int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range) range->len = trimmed; return ret; } + +/* + * btrfs_{start,end}_write() is similar to mnt_{want, drop}_write(), + * they are used to prevent the some tasks writing data into the page cache + * by nocow before the subvolume is snapshoted, but flush the data into + * the disk after the snapshot creation. + */ +void btrfs_end_nocow_write(struct btrfs_root *root) +{ + percpu_counter_dec(&root->subv_writers->counter); + /* + * Make sure counter is updated before we wake up + * waiters. + */ + smp_mb(); + if (waitqueue_active(&root->subv_writers->wait)) + wake_up(&root->subv_writers->wait); +} + +int btrfs_start_nocow_write(struct btrfs_root *root) +{ + if (unlikely(atomic_read(&root->will_be_snapshoted))) + return 0; + + percpu_counter_inc(&root->subv_writers->counter); + /* + * Make sure counter is updated before we check for snapshot creation. + */ + smp_mb(); + if (unlikely(atomic_read(&root->will_be_snapshoted))) { + btrfs_end_nocow_write(root); + return 0; + } + return 1; +} |