tree 7fed98f269c27d26b150bf5576b86b513bb02af0
parent b8c6d0958943c96ca9401961a1200568c7ec0268
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 1301425481 +0100
committer Kevin Wolf <kwolf@redhat.com> 1302177107 +0200

block: Do not cache device size for removable media

The block layer caches the device size to avoid doing lseek(fd, 0,
SEEK_END) every time this value is needed.  For removable media the
device size becomes stale if a new medium is inserted.  This patch
simply prevents device size caching for removable media.

A smarter solution is to update the cached device size when a new medium
is inserted.  Given that there are currently bugs with CD-ROM media
change I do not want to implement that approach until we've gotten
things correct first.

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