tree 580c9b7f5562e314bf13a8cdb92b342bc17db75a
parent f7a52a40cabea38b99b5053bc4f7cf45f4997603
author David Sterba <dsterba@suse.cz> 1366989623 +0000
committer Josef Bacik <jbacik@fusionio.com> 1367870125 -0400

btrfs: read entire device info under lock

There's a theoretical possibility of reading stale (or even more
theoretically, freed) data from DEV_INFO ioctl when the device would
disappear between an early mutex unlock and data being copied from the
device structure.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>