[Qemu-devel] [PATCH (trivial)] no need to use bdrv_pread() in format guessing code when we can use bdrv_read() directly

[Michael Tokarev]

[Sorry - sent the wrong patch, should have been
BDRV_SECTOR_SIZE, not BDRV_BLOCK_SIZE....]

block.c:find_image_format() calls bdrv_pread() to read first 2048
bytes from the device to guess its format.  This function can use
bdrv_read() directly since the the read is done on sector boundary.

Signed-off-by: Michael Tokarev <address@hidden>
---
 block.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block.c b/block.c
index b88ee90..b3af1f6 100644
--- a/block.c
+++ b/block.c
@@ -469,7 +469,7 @@ static int find_image_format(const char *filename, 
BlockDriver **pdrv)
         return ret;
     }
 
-    ret = bdrv_pread(bs, 0, buf, sizeof(buf));
+    ret = bdrv_read(bs, 0, buf, sizeof(buf) / BDRV_SECTOR_SIZE);
     bdrv_delete(bs);
     if (ret < 0) {
         *pdrv = NULL;
-- 
1.7.9.1