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.j...@oracle.com>
---
v2: Also to make sure bdev_closing is set it needs rcu_barrier(),
restored rcu_barrier().
v3: Removed the complicated timed-wait on blkdev_put code,
but make synced and invalidated before umount is returned.
So sorry that I have to change the title of this patch
as well (was: btrfs: wait for bdev put).
fs/btrfs/volumes.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 604daf315669..f741ade130a4 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -870,6 +870,11 @@ static void btrfs_close_one_device(struct btrfs_device
*device)
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 */
--
2.7.0
--
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