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| author | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-05-29 17:06:54 +0200 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-05-30 18:18:21 +0200 |
| commit | 95a06077f7edbd00d32612562be4d857a5b7df54 (patch) | |
| tree | 664ff2a92a2de3ba96be5a49ac36531d933ee5eb /fs/btrfs/delayed-ref.c | |
| parent | 20b297d620cd1bb94127942bbb3702fb7b1030b2 (diff) | |
| download | blackbird-op-linux-95a06077f7edbd00d32612562be4d857a5b7df54.tar.gz blackbird-op-linux-95a06077f7edbd00d32612562be4d857a5b7df54.zip | |
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.c')
| -rw-r--r-- | fs/btrfs/delayed-ref.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c index 69f22e3ab3bc..13ae7b04790e 100644 --- a/fs/btrfs/delayed-ref.c +++ b/fs/btrfs/delayed-ref.c @@ -525,7 +525,7 @@ static noinline void add_delayed_tree_ref(struct btrfs_fs_info *fs_info, ref->is_head = 0; ref->in_tree = 1; - if (need_ref_seq(for_cow, ref_root)) + if (is_fstree(ref_root)) seq = inc_delayed_seq(delayed_refs); ref->seq = seq; @@ -584,7 +584,7 @@ static noinline void add_delayed_data_ref(struct btrfs_fs_info *fs_info, ref->is_head = 0; ref->in_tree = 1; - if (need_ref_seq(for_cow, ref_root)) + if (is_fstree(ref_root)) seq = inc_delayed_seq(delayed_refs); ref->seq = seq; @@ -658,10 +658,11 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info, add_delayed_tree_ref(fs_info, trans, &ref->node, bytenr, num_bytes, parent, ref_root, level, action, for_cow); - if (!need_ref_seq(for_cow, ref_root) && + if (!is_fstree(ref_root) && waitqueue_active(&delayed_refs->seq_wait)) wake_up(&delayed_refs->seq_wait); spin_unlock(&delayed_refs->lock); + return 0; } @@ -706,10 +707,11 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info, add_delayed_data_ref(fs_info, trans, &ref->node, bytenr, num_bytes, parent, ref_root, owner, offset, action, for_cow); - if (!need_ref_seq(for_cow, ref_root) && + if (!is_fstree(ref_root) && waitqueue_active(&delayed_refs->seq_wait)) wake_up(&delayed_refs->seq_wait); spin_unlock(&delayed_refs->lock); + return 0; } |
