Btrfs: Handle data block end_io through the async work queue

Before it was done by the bio end_io routine, the work queue code is able
to scale much better with faster IO subsystems.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7ae677d8a6d..e1ef1acdb35 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -328,7 +328,9 @@ int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
         struct btrfs_trans_handle *trans;
         int ret = 0;
 
-        if (rw != WRITE) {
+        if (!(rw & (1 << BIO_RW))) {
+                ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
+                BUG_ON(ret);
                 goto mapit;
         }