diff options
Diffstat (limited to 'fs/btrfs/tree-log.h')
| -rw-r--r-- | fs/btrfs/tree-log.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/btrfs/tree-log.h b/fs/btrfs/tree-log.h index a550a8a375cd..af219e8840d2 100644 --- a/fs/btrfs/tree-log.h +++ b/fs/btrfs/tree-log.h @@ -36,6 +36,15 @@ struct btrfs_log_ctx { struct list_head conflict_inodes; int num_conflict_inodes; bool logging_conflict_inodes; + /* + * Used for fsyncs that need to copy items from the subvolume tree to + * the log tree (full sync flag set or copy everything flag set) to + * avoid allocating a temporary extent buffer while holding a lock on + * an extent buffer of the subvolume tree and under the log transaction. + * Also helps to avoid allocating and freeing a temporary extent buffer + * in case we need to process multiple leaves from the subvolume tree. + */ + struct extent_buffer *scratch_eb; }; static inline void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, @@ -53,6 +62,22 @@ static inline void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, INIT_LIST_HEAD(&ctx->conflict_inodes); ctx->num_conflict_inodes = 0; ctx->logging_conflict_inodes = false; + ctx->scratch_eb = NULL; +} + +static inline void btrfs_init_log_ctx_scratch_eb(struct btrfs_log_ctx *ctx) +{ + struct btrfs_inode *inode = BTRFS_I(ctx->inode); + + if (!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags) && + !test_bit(BTRFS_INODE_COPY_EVERYTHING, &inode->runtime_flags)) + return; + + /* + * Don't care about allocation failure. This is just for optimization, + * if we fail to allocate here, we will try again later if needed. + */ + ctx->scratch_eb = alloc_dummy_extent_buffer(inode->root->fs_info, 0); } static inline void btrfs_release_log_ctx_extents(struct btrfs_log_ctx *ctx) |