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 <[email protected]> --- 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
