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block: Add SG_IO device check in refresh_total_sectors()

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This patch adds a special case check for scsi-generic devices in
refresh_total_sectors() to skip the subsequent BlockDriver->bdrv_getlength()
that will be returning -ESPIPE from block/raw-posic.c:raw_getlength() for
BlockDriverState->sg=1 devices.

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Nicholas Bellinger 2010-05-17 09:46:04 -07:00 committed by Kevin Wolf
parent f8ea0b00e0
commit 396759ad4a
1 changed files with 4 additions and 0 deletions
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4
block.c
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@ -361,6 +361,10 @@ static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
{ {
BlockDriver *drv = bs->drv; BlockDriver *drv = bs->drv;
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
if (bs->sg)
return 0;
/* query actual device if possible, otherwise just trust the hint */ /* query actual device if possible, otherwise just trust the hint */
if (drv->bdrv_getlength) { if (drv->bdrv_getlength) {
int64_t length = drv->bdrv_getlength(bs); int64_t length = drv->bdrv_getlength(bs);