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authorDenis V. Lunev <den@openvz.org>2015-11-19 09:42:06 +0300
committerJuan Quintela <quintela@redhat.com>2015-11-19 11:50:00 +0100
commit723ccda1a0eecece8e70dbcdd35a603f6c41a475 (patch)
tree8e462a0102033941eca7ac510abc4c15dae3af04 /block
parent849f96e2f71b52444516a0880fd9d12691b63d20 (diff)
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snapshot: create bdrv_all_find_snapshot helper
to check that snapshot is available for all loaded block drivers. The check bs != bs1 in hmp_info_snapshots is an optimization. The check for availability of this snapshot will return always true as the list of snapshots was collected from that image. The patch also ensures proper locking. Signed-off-by: Denis V. Lunev <den@openvz.org> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> CC: Kevin Wolf <kwolf@redhat.com> Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/snapshot.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/block/snapshot.c b/block/snapshot.c
index 9f07a63..eae4730 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -423,3 +423,23 @@ int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs)
*first_bad_bs = bs;
return err;
}
+
+int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs)
+{
+ QEMUSnapshotInfo sn;
+ int err = 0;
+ BlockDriverState *bs = NULL;
+
+ while (err == 0 && (bs = bdrv_next(bs))) {
+ AioContext *ctx = bdrv_get_aio_context(bs);
+
+ aio_context_acquire(ctx);
+ if (bdrv_can_snapshot(bs)) {
+ err = bdrv_snapshot_find(bs, &sn, name);
+ }
+ aio_context_release(ctx);
+ }
+
+ *first_bad_bs = bs;
+ return err;
+}