tree a6df649573db46c5dfb4025e38269540613ddc01
parent 4e59b545868a5ee5f59b346337f0c44209929334
author Ryan Harper <ryanh@us.ibm.com> 1299513664 -0600
committer Kevin Wolf <kwolf@redhat.com> 1300191674 +0100

Don't allow multiwrites against a block device without underlying medium

If the block device has been closed, we no longer have a medium to submit
IO against, check for this before submitting io.  This prevents a segfault
further in the code where we dereference elements of the block driver.

Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>