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, 2 insertions, 2 deletions

diff --git a/block-qcow.c b/block-qcow.c
index b66ade35a7..fc6b809715 100644
--- a/block-qcow.c
+++ b/block-qcow.c
@@ -641,7 +641,7 @@ static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
     acb->sector_num = sector_num;
     acb->qiov = qiov;
     if (qiov->niov > 1)
-        acb->buf = acb->orig_buf = qemu_memalign(512, qiov->size);
+        acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size);
     else
         acb->buf = (uint8_t *)qiov->iov->iov_base;
     acb->nb_sectors = nb_sectors;
@@ -736,7 +736,7 @@ static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
     acb->sector_num = sector_num;
     acb->qiov = qiov;
     if (qiov->niov > 1) {
-        acb->buf = acb->orig_buf = qemu_memalign(512, qiov->size);
+        acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size);
         qemu_iovec_to_buffer(qiov, acb->buf);
     } else {
         acb->buf = (uint8_t *)qiov->iov->iov_base;