[Qemu-devel] [PATCH for-2.1 2/2] block: Assert qiov length matches request length

[Kevin Wolf <kwolf@redhat.com>]

At least raw-posix relies on this because it can allocate bounce buffers
based on the request length, but access it using all of the qiov entries
later.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c           |  2 ++
 block/raw-posix.c | 12 ++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/block.c b/block.c
index 362c85c..4358ed6 100644
--- a/block.c
+++ b/block.c
@@ -3021,6 +3021,7 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
 
     assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
     assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
+    assert(bytes == qiov->size);
 
     /* Handle Copy on Read and associated serialisation */
     if (flags & BDRV_REQ_COPY_ON_READ) {
@@ -3278,6 +3279,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
 
     assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
     assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
+    assert(bytes == qiov->size);
 
     waited = wait_serialising_requests(req);
     assert(!waited || !req->serialising);
diff --git a/block/raw-posix.c b/block/raw-posix.c
index dacf4fb..924fe69 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -990,12 +990,14 @@ static int paio_submit_co(BlockDriverState *bs, int fd,
     acb->aio_type = type;
     acb->aio_fildes = fd;
 
+    acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
+    acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
+
     if (qiov) {
         acb->aio_iov = qiov->iov;
         acb->aio_niov = qiov->niov;
+        assert(qiov->size == acb->aio_nbytes);
     }
-    acb->aio_nbytes = nb_sectors * 512;
-    acb->aio_offset = sector_num * 512;
 
     trace_paio_submit_co(sector_num, nb_sectors, type);
     pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
@@ -1013,12 +1015,14 @@ static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
     acb->aio_type = type;
     acb->aio_fildes = fd;
 
+    acb->aio_nbytes = nb_sectors * BDRV_SECTOR_SIZE;
+    acb->aio_offset = sector_num * BDRV_SECTOR_SIZE;
+
     if (qiov) {
         acb->aio_iov = qiov->iov;
         acb->aio_niov = qiov->niov;
+        assert(qiov->size == acb->aio_nbytes);
     }
-    acb->aio_nbytes = nb_sectors * 512;
-    acb->aio_offset = sector_num * 512;
 
     trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
     pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
-- 
1.8.3.1