raw-posix: Implement .bdrv_co_preadv/pwritev
The raw-posix block driver actually supports byte-aligned requests now
on non-O_DIRECT images, like it already (and previously incorrectly)
claimed in bs->request_alignment.
For some block drivers this means that a RMW cycle can be avoided when
they write sub-sector metadata e.g. for cluster allocation.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/block/linux-aio.c b/block/linux-aio.c
index 657577a..fe7cece 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -271,15 +271,12 @@
}
int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
- int64_t sector_num, QEMUIOVector *qiov,
- int nb_sectors, int type)
+ uint64_t offset, QEMUIOVector *qiov, int type)
{
- off_t offset = sector_num * BDRV_SECTOR_SIZE;
int ret;
-
struct qemu_laiocb laiocb = {
.co = qemu_coroutine_self(),
- .nbytes = nb_sectors * BDRV_SECTOR_SIZE,
+ .nbytes = qiov->size,
.ctx = s,
.is_read = (type == QEMU_AIO_READ),
.qiov = qiov,
