implement qemu_blockalign (Stefano Stabellini)

this patch adds a buffer_alignment field to BlockDriverState and
implements a qemu_blockalign function that uses that field to allocate a
memory aligned buffer to be used by the block driver.
buffer_alignment is initialized to 512 but each block driver can set
a different value (at the moment none of them do).
This patch modifies ide.c, block-qcow.c, block-qcow2.c and block.c to
use qemu_blockalign instead of qemu_memalign.
There is only one place left that still uses qemu_memalign to allocate
buffers used by block drivers that is posix-aio-compat:handle_aiocb_rw
because it is not possible to get the BlockDriverState from that
function. However I think it is not important because posix-aio-compat
already deals with driver specific code so it is supposed to know its
own needs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7229 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 1 insertions, 1 deletions

diff --git a/block-raw-posix.c b/block-raw-posix.c
index 822839f..0663c06 100644
--- a/block-raw-posix.c
+++ b/block-raw-posix.c
@@ -165,7 +165,7 @@ static int raw_open(BlockDriverState *bs, const char *filename, int flags)
     s->fd = fd;
     s->aligned_buf = NULL;
     if ((flags & BDRV_O_NOCACHE)) {
-        s->aligned_buf = qemu_memalign(512, ALIGNED_BUFFER_SIZE);
+        s->aligned_buf = qemu_blockalign(bs, ALIGNED_BUFFER_SIZE);
         if (s->aligned_buf == NULL) {
             ret = -errno;
             close(fd);