@@ -470,3 +470,18 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
*first_bad_bs = bs;
return err;
}
+
+BlockDriverState *bdrv_all_find_vmstate_bs(void)
+{
+ bool not_found = true;
+ BlockDriverState *bs = NULL;
+
+ while (not_found && (bs = bdrv_next(bs))) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ not_found = !bdrv_can_snapshot(bs);
+ aio_context_release(ctx);
+ }
+ return bs;
+}
@@ -92,4 +92,6 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
uint64_t vm_state_size,
BlockDriverState **first_bad_bs);
+BlockDriverState *bdrv_all_find_vmstate_bs(void);
+
#endif
@@ -1237,17 +1237,6 @@ out:
return ret;
}
-static BlockDriverState *find_vmstate_bs(void)
-{
- BlockDriverState *bs = NULL;
- while ((bs = bdrv_next(bs))) {
- if (bdrv_can_snapshot(bs)) {
- return bs;
- }
- }
- return NULL;
-}
-
void hmp_savevm(Monitor *mon, const QDict *qdict)
{
BlockDriverState *bs, *bs1;
@@ -1276,8 +1265,8 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
return;
}
- bs = find_vmstate_bs();
- if (!bs) {
+ bs = bdrv_all_find_vmstate_bs();
+ if (bs == NULL) {
monitor_printf(mon, "No block device can accept snapshots\n");
return;
}
@@ -1386,7 +1375,7 @@ int load_vmstate(const char *name)
return ret;
}
- bs_vm_state = find_vmstate_bs();
+ bs_vm_state = bdrv_all_find_vmstate_bs();
if (!bs_vm_state) {
error_report("No block device supports snapshots");
return -ENOTSUP;
@@ -1455,7 +1444,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
int total;
int *available_snapshots;
- bs = find_vmstate_bs();
+ bs = bdrv_all_find_vmstate_bs();
if (!bs) {
monitor_printf(mon, "No available block device supports snapshots\n");
return;
The patch also ensures proper locking for the operation. Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Juan Quintela <quintela@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Kevin Wolf <kwolf@redhat.com> --- block/snapshot.c | 15 +++++++++++++++ include/block/snapshot.h | 2 ++ migration/savevm.c | 19 ++++--------------- 3 files changed, 21 insertions(+), 15 deletions(-)