tree 6923fc62d70bd600c12d9b3dd564cabcb524f738
parent 3d1807ac6707773526b193f296e72c6c86969bf7
author Jeff Cody <jcody@redhat.com> 1348168405 -0400
committer Kevin Wolf <kwolf@redhat.com> 1348492512 +0200

block: raw-posix image file reopen

This is derived from the Supriya Kannery's reopen patches.

This contains the raw-posix driver changes for the bdrv_reopen_*
functions.  All changes are staged into a temporary scratch buffer
during the prepare() stage, and copied over to the live structure
during commit().  Upon abort(), all changes are abandoned, and the
live structures are unmodified.

The _prepare() will create an extra fd - either by means of a dup,
if possible, or opening a new fd if not (for instance, access
control changes).  Upon _commit(), the original fd is closed and
the new fd is used.  Upon _abort(), the duplicate/new fd is closed.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>