From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch adds a special BlockDriverState->sg check in block.c:find_image_format()
after bdrv_file_open() -> block/raw-posix.c:hdev_open() has been called to determine
if we are dealing with a Linux host scsi-generic device or not.
The patch then returns the BlockDriver * from find_protocol(), skipping the subsequent
bdrv_read() and rest of find_image_format().
Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
---
block.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index 48305b7..02a22f6 100644
--- a/block.c
+++ b/block.c
@@ -332,6 +332,13 @@ static BlockDriver *find_image_format(const char *filename)
ret = bdrv_file_open(&bs, filename, 0);
if (ret < 0)
return NULL;
+ /*
+ * For scsi-generic we skip the read and return *drv from
+ * find_protocol().
+ */
+ if (bs->sg)
+ return drv;
+
ret = bdrv_pread(bs, 0, buf, sizeof(buf));
bdrv_delete(bs);
if (ret < 0) {
--
1.5.6.5
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