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| author | Chris Mason <clm@fb.com> | 2015-10-12 16:24:40 -0700 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-10-12 16:24:40 -0700 |
| commit | 6db4a7335dd701a0e20275440ee057d3db2a7ae3 (patch) | |
| tree | c0734d7411806ef91bfeb615bf528ffb349938fe /fs/btrfs/delayed-inode.c | |
| parent | 62fb50ab7c903357c92cef2f7677235b92ac575f (diff) | |
| parent | ee86395458072760d62e66aad10a5e9e8902b8cf (diff) | |
| download | talos-op-linux-6db4a7335dd701a0e20275440ee057d3db2a7ae3.tar.gz talos-op-linux-6db4a7335dd701a0e20275440ee057d3db2a7ae3.zip | |
Merge branch 'fix/waitqueue-barriers' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux into for-linus-4.4
Diffstat (limited to 'fs/btrfs/delayed-inode.c')
| -rw-r--r-- | fs/btrfs/delayed-inode.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c index a2ae42720a6a..e0941fbb913c 100644 --- a/fs/btrfs/delayed-inode.c +++ b/fs/btrfs/delayed-inode.c @@ -463,6 +463,10 @@ static int __btrfs_add_delayed_deletion_item(struct btrfs_delayed_node *node, static void finish_one_item(struct btrfs_delayed_root *delayed_root) { int seq = atomic_inc_return(&delayed_root->items_seq); + + /* + * atomic_dec_return implies a barrier for waitqueue_active + */ if ((atomic_dec_return(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND || seq % BTRFS_DELAYED_BATCH == 0) && waitqueue_active(&delayed_root->wait)) |
