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

Message ID 1331655521-5986-1-git-send-email-mjt@msgid.tls.msk.ru
State New
Headers show

Commit Message

Michael Tokarev March 13, 2012, 4:18 p.m. UTC 
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 <mjt@tls.msk.ru>
---
 block.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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Patch

diff --git a/block.c b/block.c
index b88ee90..6b5bcaf 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_BLOCK_SIZE);
     bdrv_delete(bs);
     if (ret < 0) {
         *pdrv = NULL;