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btrfs: comment the rest of implicit barriers before waitqueue_active

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There are atomic operations that imply the barrier for waitqueue_active
mixed in an if-condition.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2015-02-16 19:41:40 +01:00
parent 779adf0f64
commit ee86395458
5 changed files with 22 additions and 0 deletions
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4
fs/btrfs/delayed-inode.c
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@@ -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))