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[Qemu-devel] [PATCH 2/2] [block]: Add SG_IO device check in refresh_tota
From: |
Nicholas A. Bellinger |
Subject: |
[Qemu-devel] [PATCH 2/2] [block]: Add SG_IO device check in refresh_total_sectors() |
Date: |
Mon, 17 May 2010 09:46:04 -0700 |
From: Nicholas Bellinger <address@hidden>
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 <address@hidden>
---
block.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index f419ee6..7917712 100644
--- a/block.c
+++ b/block.c
@@ -364,6 +364,10 @@ static int refresh_total_sectors(BlockDriverState *bs,
int64_t hint)
{
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 */
if (drv->bdrv_getlength) {
int64_t length = drv->bdrv_getlength(bs);
--
1.5.6.5
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