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btrfs: make sure device is synced before return

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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>
This commit is contained in:
Anand Jain 2016-06-23 20:54:07 +08:00 committed by David Sterba
parent f448341af9
commit e2bf6e89b4
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/volumes.c
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@ -870,6 +870,11 @@ static void btrfs_close_one_device(struct btrfs_device *device)
if (device->missing) if (device->missing)
fs_devices->missing_devices--; 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, new_device = btrfs_alloc_device(NULL, &device->devid,
device->uuid); device->uuid);
BUG_ON(IS_ERR(new_device)); /* -ENOMEM */ BUG_ON(IS_ERR(new_device)); /* -ENOMEM */