aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>2019-06-04 19:15:07 +0300
committerStefan Hajnoczi <stefanha@redhat.com>2019-08-27 14:58:42 +0100
commit1143ec5ebf48d6dbf61f600eb5f875aefffb8fb6 (patch)
tree7a69dc4ed54e4fa893bb7e7454322103975b1ebb
parentac850bf099f8a356788d487c5205345dfd755fca (diff)
block/io: bdrv_co_do_copy_on_readv: use and support qiov_offset
Use and support new API in bdrv_co_do_copy_on_readv. Note that in case of allocated-in-top we need to shrink read size to MIN(..) by hand, as pre-patch this was actually done implicitly by qemu_iovec_concat (and we used local_qiov.size). Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20190604161514.262241-6-vsementsov@virtuozzo.com Message-Id: <20190604161514.262241-6-vsementsov@virtuozzo.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
-rw-r--r--block/io.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/block/io.c b/block/io.c
index fd2fc7d5ff..5817bb9405 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1227,7 +1227,7 @@ bdrv_driver_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
- int flags)
+ size_t qiov_offset, int flags)
{
BlockDriverState *bs = child->bs;
@@ -1239,7 +1239,6 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
void *bounce_buffer;
BlockDriver *drv = bs->drv;
- QEMUIOVector local_qiov;
int64_t cluster_offset;
int64_t cluster_bytes;
size_t skip_bytes;
@@ -1302,6 +1301,8 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
assert(skip_bytes < pnum);
if (ret <= 0) {
+ QEMUIOVector local_qiov;
+
/* Must copy-on-read; use the bounce buffer */
pnum = MIN(pnum, MAX_BOUNCE_BUFFER);
qemu_iovec_init_buf(&local_qiov, bounce_buffer, pnum);
@@ -1339,16 +1340,15 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
}
if (!(flags & BDRV_REQ_PREFETCH)) {
- qemu_iovec_from_buf(qiov, progress, bounce_buffer + skip_bytes,
+ qemu_iovec_from_buf(qiov, qiov_offset + progress,
+ bounce_buffer + skip_bytes,
pnum - skip_bytes);
}
} else if (!(flags & BDRV_REQ_PREFETCH)) {
/* Read directly into the destination */
- qemu_iovec_init(&local_qiov, qiov->niov);
- qemu_iovec_concat(&local_qiov, qiov, progress, pnum - skip_bytes);
- ret = bdrv_driver_preadv(bs, offset + progress, local_qiov.size,
- &local_qiov, 0, 0);
- qemu_iovec_destroy(&local_qiov);
+ ret = bdrv_driver_preadv(bs, offset + progress,
+ MIN(pnum - skip_bytes, bytes - progress),
+ qiov, qiov_offset + progress, 0);
if (ret < 0) {
goto err;
}
@@ -1422,7 +1422,7 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
}
if (!ret || pnum != bytes) {
- ret = bdrv_co_do_copy_on_readv(child, offset, bytes, qiov, flags);
+ ret = bdrv_co_do_copy_on_readv(child, offset, bytes, qiov, 0, flags);
goto out;
} else if (flags & BDRV_REQ_PREFETCH) {
goto out;