To make it clear about id and name in searching, add this API
to distinguish them. Caller can choose to search by id or name,
*errp will be set only for exception.
Some code are modified based on Pavel's patch.
Signed-off-by: Wenchao Xia <address@hidden>
Signed-off-by: Pavel Hrdina <address@hidden>
---
block/snapshot.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++
include/block/snapshot.h | 6 ++++
2 files changed, 80 insertions(+), 0 deletions(-)
diff --git a/block/snapshot.c b/block/snapshot.c
index 6c6d9de..0a9af4e 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -48,6 +48,80 @@ int bdrv_snapshot_find(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info,
return ret;
}
+/**
+ * Look up an internal snapshot by @id and @name.
+ * @bs: block device to search
+ * @id: unique snapshot ID, or NULL
+ * @name: snapshot name, or NULL
+ * @sn_info: location to store information on the snapshot found
+ * @errp: location to store error, will be set only for exception
+ *
+ * This function will traverse snapshot list in @bs to search the matching
+ * one, @id and @name are the matching condition:
+ * If both @id and @name are specified, find the first one with id @id and
+ * name @name.
+ * If only @id is specified, find the first one with id @id.
+ * If only @name is specified, find the first one with name @name.
+ * if none is specified, abort().
+ *
+ * Returns: true when a snapshot is found and @sn_info will be filled, false
+ * when error or not found. If all operation succeed but no matching one is
+ * found, @errp will NOT be set.
+ */
+bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs,
+ const char *id,
+ const char *name,
+ QEMUSnapshotInfo *sn_info,
+ Error **errp)
+{
+ QEMUSnapshotInfo *sn_tab, *sn;
+ int nb_sns, i;
+ bool ret = false;
+
+ nb_sns = bdrv_snapshot_list(bs, &sn_tab);
+ if (nb_sns < 0) {
+ error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list");
+ return false;
+ } else if (nb_sns == 0) {
+ return false;
+ }
+
+ if (id && name) {
+ for (i = 0; i < nb_sns; i++) {
+ sn = &sn_tab[i];
+ if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) {
+ *sn_info = *sn;
+ ret = true;
+ break;
+ }
+ }
+ } else if (id) {
+ for (i = 0; i < nb_sns; i++) {
+ sn = &sn_tab[i];
+ if (!strcmp(sn->id_str, id)) {
+ *sn_info = *sn;
+ ret = true;
+ break;
+ }
+ }
+ } else if (name) {
+ for (i = 0; i < nb_sns; i++) {
+ sn = &sn_tab[i];
+ if (!strcmp(sn->name, name)) {
+ *sn_info = *sn;
+ ret = true;
+ break;
+ }
+ }
+ } else {
+ /* program error */
+ abort();
+ }