diff mbox

[v8,01/17] block: Add qemu_{, try_}blockalign0()

Message ID 1413979783-1549-2-git-send-email-mreitz@redhat.com
State New
Headers show

Commit Message

Max Reitz Oct. 22, 2014, 12:09 p.m. UTC 
These functions call their non-0-counterparts and then fill the
allocated buffer with 0 (if the allocation has been successful).

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block.c               | 16 ++++++++++++++++
 include/block/block.h |  2 ++
 2 files changed, 18 insertions(+)

Comments

Eric Blake Oct. 22, 2014, 2:02 p.m. UTC | #1 
On 10/22/2014 06:09 AM, Max Reitz wrote:
> These functions call their non-0-counterparts and then fill the
> allocated buffer with 0 (if the allocation has been successful).
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block.c               | 16 ++++++++++++++++
>  include/block/block.h |  2 ++
>  2 files changed, 18 insertions(+)

Reviewed-by: Eric Blake <eblake@redhat.com>
diff mbox

Patch

diff --git a/block.c b/block.c
index 773e87e..bbb04e7 100644
--- a/block.c
+++ b/block.c
@@ -5200,6 +5200,11 @@  void *qemu_blockalign(BlockDriverState *bs, size_t size)
     return qemu_memalign(bdrv_opt_mem_align(bs), size);
 }
 
+void *qemu_blockalign0(BlockDriverState *bs, size_t size)
+{
+    return memset(qemu_blockalign(bs, size), 0, size);
+}
+
 void *qemu_try_blockalign(BlockDriverState *bs, size_t size)
 {
     size_t align = bdrv_opt_mem_align(bs);
@@ -5213,6 +5218,17 @@  void *qemu_try_blockalign(BlockDriverState *bs, size_t size)
     return qemu_try_memalign(align, size);
 }
 
+void *qemu_try_blockalign0(BlockDriverState *bs, size_t size)
+{
+    void *mem = qemu_try_blockalign(bs, size);
+
+    if (mem) {
+        memset(mem, 0, size);
+    }
+
+    return mem;
+}
+
 /*
  * Check if all memory in this vector is sector aligned.
  */
diff --git a/include/block/block.h b/include/block/block.h
index c9ec0ab..341054d 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -412,7 +412,9 @@  void bdrv_img_create(const char *filename, const char *fmt,
 size_t bdrv_opt_mem_align(BlockDriverState *bs);
 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
 void *qemu_blockalign(BlockDriverState *bs, size_t size);
+void *qemu_blockalign0(BlockDriverState *bs, size_t size);
 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
+void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 
 struct HBitmapIter;