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[Qemu-devel] [PATCH V10 06/17] block: add check for VM snapshot in bdrv_
From: |
Wenchao Xia |
Subject: |
[Qemu-devel] [PATCH V10 06/17] block: add check for VM snapshot in bdrv_query_snapshot_info_list() |
Date: |
Fri, 22 Mar 2013 22:19:02 +0800 |
This patch adds a parameter to tell whether return valid snapshots
for whole VM only.
Signed-off-by: Wenchao Xia <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
block/qapi.c | 42 ++++++++++++++++++++++++++++++++++++++++--
include/block/qapi.h | 1 +
qemu-img.c | 3 ++-
3 files changed, 43 insertions(+), 3 deletions(-)
diff --git a/block/qapi.c b/block/qapi.c
index 119f1f9..007e691 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -23,11 +23,47 @@
*/
#include "block/qapi.h"
+#include "block/snapshot.h"
#include "block/block_int.h"
-/* return 0 on success, and @p_list will be set only on success. */
+/*
+ * check whether the snapshot is valid for whole vm.
+ *
+ * @sn: snapshot info to be checked.
+ * @bs: where @sn was found.
+ *
+ * return true if the snapshot is consistent for the VM.
+ */
+static bool snapshot_valid_for_vm(const QEMUSnapshotInfo *sn,
+ BlockDriverState *bs)
+{
+ BlockDriverState *bs1 = NULL;
+ QEMUSnapshotInfo s, *sn_info = &s;
+ int ret;
+
+ /* Check logic is connected with load_vmstate():
+ Only check the devices that can snapshot, other devices that can't
+ take snapshot, for example, readonly ones, will be ignored in
+ load_vmstate(). */
+ while ((bs1 = bdrv_next(bs1))) {
+ if (bs1 != bs && bdrv_can_snapshot(bs1)) {
+ ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str, NULL);
+ if (ret < 0) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+/*
+ * return 0 on success, and @p_list will be set only on success. If
+ * @vm_snapshot is true, limit the results to snapshots valid for the
+ * whole VM.
+ */
int bdrv_query_snapshot_info_list(BlockDriverState *bs,
SnapshotInfoList **p_list,
+ bool vm_snapshot,
Error **errp)
{
int i, sn_count;
@@ -56,7 +92,9 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs,
}
for (i = 0; i < sn_count; i++) {
-
+ if (vm_snapshot && !snapshot_valid_for_vm(&sn_tab[i], bs)) {
+ continue;
+ }
info = g_new0(SnapshotInfo, 1);
info->id = g_strdup(sn_tab[i].id_str);
info->name = g_strdup(sn_tab[i].name);
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 91dc41b..fe66053 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -30,6 +30,7 @@
int bdrv_query_snapshot_info_list(BlockDriverState *bs,
SnapshotInfoList **p_list,
+ bool vm_snapshot,
Error **errp);
void bdrv_collect_image_info(BlockDriverState *bs,
ImageInfo *info,
diff --git a/qemu-img.c b/qemu-img.c
index 9fb33e1..98ae4b1 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1735,7 +1735,8 @@ static ImageInfoList *collect_image_info_list(const char
*filename,
info = g_new0(ImageInfo, 1);
bdrv_collect_image_info(bs, info, filename);
- if (!bdrv_query_snapshot_info_list(bs, &info->snapshots, NULL)) {
+ if (!bdrv_query_snapshot_info_list(bs, &info->snapshots,
+ false, NULL)) {
info->has_snapshots = true;
}
--
1.7.1
- [Qemu-devel] [PATCH V10 00/17] qmp/hmp interfaces for internal snapshot info, Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 01/17] block: move bdrv_snapshot_find() to block/snapshot.c, Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 02/17] block: distinguish id and name in bdrv_find_snapshot(), Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 03/17] qemu-img: remove unused parameter in collect_image_info(), Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 04/17] block: move collect_snapshots() and collect_image_info() to block/qapi.c, Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 06/17] block: add check for VM snapshot in bdrv_query_snapshot_info_list(),
Wenchao Xia <=
- [Qemu-devel] [PATCH V10 05/17] block: add snapshot info query function bdrv_query_snapshot_info_list(), Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 08/17] block: move qmp_query_block() and bdrv_query_info() to block/qapi.c, Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 09/17] qmp: add interface query-snapshots, Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 07/17] block: add image info query function bdrv_query_image_info(), Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 10/17] qmp: add recursive member in ImageInfo, Wenchao Xia, 2013/03/22
- [Qemu-devel] [PATCH V10 11/17] qmp: add ImageInfo in BlockDeviceInfo used by query-block, Wenchao Xia, 2013/03/22