On 06/21/2016 06:24 AM, Anand Jain wrote:
From: Anand Jain <Anand.Jain@xxxxxxxxxx>
Further to the commit
bc178622d40d87e75abc131007342429c9b03351
btrfs: use rcu_barrier() to wait for bdev puts at unmount
This patch implements a method to time wait on the __free_device()
which actually does the bdev put. This is needed as the user space
running 'btrfs fi show -d' immediately after the replace and
unmount, is still reading older information from the device.
Thanks for working on this Anand. Since it looks like blkdev_put can
deadlock against us, can we please switch to making sure we fully flush
the outstanding IO? It's probably enough to do a sync_blockdev() call
before we allow the unmount to finish, but we can toss in an
invalidate_bdev for good measure.
Then we can get rid of the mdelay loop completely, which seems pretty
error prone to me.
Thanks!
-chris
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
