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author | David Sterba <dsterba@suse.com> | 2015-10-10 18:24:48 +0200 |
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committer | David Sterba <dsterba@suse.com> | 2015-10-10 18:24:48 +0200 |
commit | b666a9cd993c6a49c4bf23a1ed476359c978f60b (patch) | |
tree | 891191e5484097c70b953b63029484628dea76c8 /fs/btrfs/transaction.c | |
parent | 730d9ec36bf27e87805aee6ebf462071735e31f9 (diff) | |
download | op-kernel-dev-b666a9cd993c6a49c4bf23a1ed476359c978f60b.zip op-kernel-dev-b666a9cd993c6a49c4bf23a1ed476359c978f60b.tar.gz |
btrfs: add barrier for waitqueue_active in clear_btree_io_tree
waitqueue_active should be preceded by a barrier, in this function we
don't need to call it all the time.
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r-- | fs/btrfs/transaction.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 74bc333..e8e5b5a 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -82,6 +82,12 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction) static void clear_btree_io_tree(struct extent_io_tree *tree) { spin_lock(&tree->lock); + /* + * Do a single barrier for the waitqueue_active check here, the state + * of the waitqueue should not change once clear_btree_io_tree is + * called. + */ + smp_mb(); while (!RB_EMPTY_ROOT(&tree->state)) { struct rb_node *node; struct extent_state *state; |