Re: [PATCH v4 01/11] block/io: bring request check to bdrv_co_{read,write}v_vmstate

[Eric Blake]

On 3/24/21 3:51 PM, Vladimir Sementsov-Ogievskiy wrote:
> There are only two drivers supporting vmstate: qcow2 and sheepdog.
> Sheepdog is deprecated. In qcow2 these requests go through
> .bdrv_co_p{read,write}v_part handlers.
> 
> So, let's do our basic check for the request on vmstate generic
> handlers.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy 
> ---
>  block/io.c | 18 --
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 

Reviewed-by: Eric Blake 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.   +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

[PATCH v4 01/11] block/io: bring request check to bdrv_co_{read, write}v_vmstate

[Vladimir Sementsov-Ogievskiy via]

There are only two drivers supporting vmstate: qcow2 and sheepdog.
Sheepdog is deprecated. In qcow2 these requests go through
.bdrv_co_p{read,write}v_part handlers.

So, let's do our basic check for the request on vmstate generic
handlers.

Signed-off-by: Vladimir Sementsov-Ogievskiy 
---
 block/io.c | 18 --
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/block/io.c b/block/io.c
index ca2dca3007..3bbb852da6 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2718,7 +2718,12 @@ bdrv_co_readv_vmstate(BlockDriverState *bs, QEMUIOVector 
*qiov, int64_t pos)
 {
 BlockDriver *drv = bs->drv;
 BlockDriverState *child_bs = bdrv_primary_bs(bs);
-int ret = -ENOTSUP;
+int ret;
+
+ret = bdrv_check_qiov_request(pos, qiov->size, qiov, 0, NULL);
+if (ret < 0) {
+return ret;
+}
 
 if (!drv) {
 return -ENOMEDIUM;
@@ -2730,6 +2735,8 @@ bdrv_co_readv_vmstate(BlockDriverState *bs, QEMUIOVector 
*qiov, int64_t pos)
 ret = drv->bdrv_load_vmstate(bs, qiov, pos);
 } else if (child_bs) {
 ret = bdrv_co_readv_vmstate(child_bs, qiov, pos);
+} else {
+ret = -ENOTSUP;
 }
 
 bdrv_dec_in_flight(bs);
@@ -2742,7 +2749,12 @@ bdrv_co_writev_vmstate(BlockDriverState *bs, 
QEMUIOVector *qiov, int64_t pos)
 {
 BlockDriver *drv = bs->drv;
 BlockDriverState *child_bs = bdrv_primary_bs(bs);
-int ret = -ENOTSUP;
+int ret;
+
+ret = bdrv_check_qiov_request(pos, qiov->size, qiov, 0, NULL);
+if (ret < 0) {
+return ret;
+}
 
 if (!drv) {
 return -ENOMEDIUM;
@@ -2754,6 +2766,8 @@ bdrv_co_writev_vmstate(BlockDriverState *bs, QEMUIOVector 
*qiov, int64_t pos)
 ret = drv->bdrv_save_vmstate(bs, qiov, pos);
 } else if (child_bs) {
 ret = bdrv_co_writev_vmstate(child_bs, qiov, pos);
+} else {
+ret = -ENOTSUP;
 }
 
 bdrv_dec_in_flight(bs);
-- 
2.29.2