btrfs: make sure device is synced before return
An inconsistent behavior due to stale reads from the
disk was reported
mail-archive.com/linux-btrfs@vger.kernel.org/msg54188.html
This patch will make sure devices are synced before
return in the unmount thread.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index e54b3fe..51bd3ee 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -870,6 +870,11 @@
if (device->missing)
fs_devices->missing_devices--;
+ if (device->bdev && device->writeable) {
+ sync_blockdev(device->bdev);
+ invalidate_bdev(device->bdev);
+ }
+
new_device = btrfs_alloc_device(NULL, &device->devid,
device->uuid);
BUG_ON(IS_ERR(new_device)); /* -ENOMEM */