Btrfs: unplug all devices in the unplug call back
For larger multi-device filesystems, there was logic to limit the
number of devices unplugged to just the page that was sent to our sync_page
function.
But, the code wasn't always unplugging the right device. Since this was
just an optimization, disable it for now.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e18250a..0e8d312 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1214,7 +1214,7 @@
u64 offset;
/* the generic O_DIRECT read code does this */
- if (!page) {
+ if (1 || !page) {
__unplug_io_fn(bdi, page);
return;
}