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authorJan Schmidt <list.btrfs@jan-o-sch.net>2012-05-29 19:06:54 +0400
committerJan Schmidt <list.btrfs@jan-o-sch.net>2012-05-30 20:18:21 +0400
commit95a06077f7edbd00d32612562be4d857a5b7df54 (patch)
tree664ff2a92a2de3ba96be5a49ac36531d933ee5eb /fs/btrfs/delayed-ref.h
parent20b297d620cd1bb94127942bbb3702fb7b1030b2 (diff)
downloadlinux-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.h19
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.
*/