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| author | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-05-29 19:06:54 +0400 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-05-30 20:18:21 +0400 |
| commit | 95a06077f7edbd00d32612562be4d857a5b7df54 (patch) | |
| tree | 664ff2a92a2de3ba96be5a49ac36531d933ee5eb /fs/btrfs/delayed-ref.h | |
| parent | 20b297d620cd1bb94127942bbb3702fb7b1030b2 (diff) | |
| download | linux-95a06077f7edbd00d32612562be4d857a5b7df54.tar.xz | |
Btrfs: use delayed ref sequence numbers for all fs-tree updates
The sequence number for delayed refs is needed to postpone certain delayed
refs for a very short period while walking backrefs. Before the tree
modification log, we thought we'd only have to hold back those references
that don't have a counter operation.
While now we've the tree mod log, we're rewinding fs tree blocks to a
defined consistent state. We cannot know in advance for which tree block
we'll be doing rewind operations later. Therefore, we must postpone all the
delayed refs for fs-tree blocks, even those having a counter operation.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Diffstat (limited to 'fs/btrfs/delayed-ref.h')
| -rw-r--r-- | fs/btrfs/delayed-ref.h | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h index fd8244670212..413927fb9957 100644 --- a/fs/btrfs/delayed-ref.h +++ b/fs/btrfs/delayed-ref.h @@ -225,25 +225,6 @@ int btrfs_check_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs, u64 seq); /* - * delayed refs with a ref_seq > 0 must be held back during backref walking. - * this only applies to items in one of the fs-trees. for_cow items never need - * to be held back, so they won't get a ref_seq number. - */ -static inline int need_ref_seq(int for_cow, u64 rootid) -{ - if (for_cow) - return 0; - - if (rootid == BTRFS_FS_TREE_OBJECTID) - return 1; - - if ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID) - return 1; - - return 0; -} - -/* * a node might live in a head or a regular ref, this lets you * test for the proper type to use. */ |