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block: use drained section around bdrv_snapshot_delete 

Do not use bdrv_drain, since by itself it does not guarantee
anything.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-12-16 19:33:45 +01:00 committed by Kevin Wolf
parent 8382ba6153
commit 27a7649a48
1 changed files with 14 additions and 9 deletions
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23
block/snapshot.c
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@ -229,6 +229,8 @@ int bdrv_snapshot_delete(BlockDriverState *bs,
Error **errp)
{
BlockDriver *drv = bs->drv;
int ret;
if (!drv) {
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
return -ENOMEDIUM;
@ -239,18 +241,21 @@ int bdrv_snapshot_delete(BlockDriverState *bs,
}
/* drain all pending i/o before deleting snapshot */
bdrv_drain(bs);
bdrv_drained_begin(bs);
if (drv->bdrv_snapshot_delete) {
return drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp);
ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp);
} else if (bs->file) {
ret = bdrv_snapshot_delete(bs->file->bs, snapshot_id, name, errp);
} else {
error_setg(errp, "Block format '%s' used by device '%s' "
"does not support internal snapshot deletion",
drv->format_name, bdrv_get_device_name(bs));
ret = -ENOTSUP;
}
if (bs->file) {
return bdrv_snapshot_delete(bs->file->bs, snapshot_id, name, errp);
}
error_setg(errp, "Block format '%s' used by device '%s' "
"does not support internal snapshot deletion",
drv->format_name, bdrv_get_device_name(bs));
return -ENOTSUP;
bdrv_drained_end(bs);
return ret;
}
int bdrv_snapshot_delete_by_id_or_name(BlockDriverState *bs,