[Qemu-devel] [PATCH 1/4] Cleanup: bdrv_open() no need to shift total_size just to shift back.

[Jes.Sorensen@redhat.com]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

In bdrv_open() there is no need to shift total_size >> 9 just to
multiply it by 512 again just a few lines later, since this is the
only place the variable is used.

Mask with BDRV_SECTOR_MASK to protect against case where we are
passed a corrupted image.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 block.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index cd70730..a094454 100644
--- a/block.c
+++ b/block.c
@@ -521,7 +521,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
             bdrv_delete(bs1);
             return ret;
         }
-        total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS;
+        total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
 
         if (bs1->drv && bs1->drv->protocol_name)
             is_protocol = 1;
@@ -540,7 +540,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
         bdrv_qcow2 = bdrv_find_format("qcow2");
         options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
 
-        set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
+        set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
         set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
         if (drv) {
             set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
-- 
1.6.5.2