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| author | Chris Mason <chris.mason@fusionio.com> | 2012-07-25 16:03:32 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2012-07-25 16:15:08 -0400 |
| commit | cd1cfc49153ba2bef247e500d8bd4d135193ece9 (patch) | |
| tree | 34446eea9087a689b7864506197292bf9689fd28 /fs | |
| parent | e9fbcb42201c862fd6ab45c48ead4f47bb2dea9d (diff) | |
Btrfs: add a barrier before a waitqueue_active check
We were missing wakeups on the delayed ref waitqueue due
to races on waitqueue_active.
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 44f06201f376..4e1b153b7c47 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5294,6 +5294,7 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, rb_erase(&head->node.rb_node, &delayed_refs->root); delayed_refs->num_entries--; + smp_mb(); if (waitqueue_active(&root->fs_info->tree_mod_seq_wait)) wake_up(&root->fs_info->tree_mod_seq_wait); |