hmp: show all of snapshot info on every block dev in output of 'info snapshots'
Currently, the output of 'info snapshots' shows fully available snapshots.
It's opaque, hides some snapshot information to users. It's not convenient
if users want to know more about all of snapshot information on every block
device via monitor.
Follow Kevin's and Max's proposals, The patch makes the output more detailed:
(qemu) info snapshots
List of snapshots present on all disks:
ID TAG VM SIZE DATE VM CLOCK
-- checkpoint-1 165M 2016-05-22 16:58:07 00:02:06.813
List of partial (non-loadable) snapshots on 'drive_image1':
ID TAG VM SIZE DATE VM CLOCK
1 snap1 0 2016-05-22 16:57:31 00:01:30.567
Signed-off-by: Lin Ma <lma@suse.com>
Message-id: 1467869164-26688-3-git-send-email-lma@suse.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/migration/savevm.c b/migration/savevm.c
index a8f22da..33a2911 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2200,12 +2200,31 @@
void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
{
BlockDriverState *bs, *bs1;
+ BdrvNextIterator it1;
QEMUSnapshotInfo *sn_tab, *sn;
+ bool no_snapshot = true;
int nb_sns, i;
int total;
- int *available_snapshots;
+ int *global_snapshots;
AioContext *aio_context;
+ typedef struct SnapshotEntry {
+ QEMUSnapshotInfo sn;
+ QTAILQ_ENTRY(SnapshotEntry) next;
+ } SnapshotEntry;
+
+ typedef struct ImageEntry {
+ const char *imagename;
+ QTAILQ_ENTRY(ImageEntry) next;
+ QTAILQ_HEAD(, SnapshotEntry) snapshots;
+ } ImageEntry;
+
+ QTAILQ_HEAD(, ImageEntry) image_list =
+ QTAILQ_HEAD_INITIALIZER(image_list);
+
+ ImageEntry *image_entry, *next_ie;
+ SnapshotEntry *snapshot_entry;
+
bs = bdrv_all_find_vmstate_bs();
if (!bs) {
monitor_printf(mon, "No available block device supports snapshots\n");
@@ -2222,25 +2241,65 @@
return;
}
- if (nb_sns == 0) {
+ for (bs1 = bdrv_first(&it1); bs1; bs1 = bdrv_next(&it1)) {
+ int bs1_nb_sns = 0;
+ ImageEntry *ie;
+ SnapshotEntry *se;
+ AioContext *ctx = bdrv_get_aio_context(bs1);
+
+ aio_context_acquire(ctx);
+ if (bdrv_can_snapshot(bs1)) {
+ sn = NULL;
+ bs1_nb_sns = bdrv_snapshot_list(bs1, &sn);
+ if (bs1_nb_sns > 0) {
+ no_snapshot = false;
+ ie = g_new0(ImageEntry, 1);
+ ie->imagename = bdrv_get_device_name(bs1);
+ QTAILQ_INIT(&ie->snapshots);
+ QTAILQ_INSERT_TAIL(&image_list, ie, next);
+ for (i = 0; i < bs1_nb_sns; i++) {
+ se = g_new0(SnapshotEntry, 1);
+ se->sn = sn[i];
+ QTAILQ_INSERT_TAIL(&ie->snapshots, se, next);
+ }
+ }
+ g_free(sn);
+ }
+ aio_context_release(ctx);
+ }
+
+ if (no_snapshot) {
monitor_printf(mon, "There is no snapshot available.\n");
return;
}
- available_snapshots = g_new0(int, nb_sns);
+ global_snapshots = g_new0(int, nb_sns);
total = 0;
for (i = 0; i < nb_sns; i++) {
+ SnapshotEntry *next_sn;
if (bdrv_all_find_snapshot(sn_tab[i].name, &bs1) == 0) {
- available_snapshots[total] = i;
+ global_snapshots[total] = i;
total++;
+ QTAILQ_FOREACH(image_entry, &image_list, next) {
+ QTAILQ_FOREACH_SAFE(snapshot_entry, &image_entry->snapshots,
+ next, next_sn) {
+ if (!strcmp(sn_tab[i].name, snapshot_entry->sn.name)) {
+ QTAILQ_REMOVE(&image_entry->snapshots, snapshot_entry,
+ next);
+ g_free(snapshot_entry);
+ }
+ }
+ }
}
}
+ monitor_printf(mon, "List of snapshots present on all disks:\n");
+
if (total > 0) {
bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
monitor_printf(mon, "\n");
for (i = 0; i < total; i++) {
- sn = &sn_tab[available_snapshots[i]];
+ sn = &sn_tab[global_snapshots[i]];
/* The ID is not guaranteed to be the same on all images, so
* overwrite it.
*/
@@ -2249,11 +2308,35 @@
monitor_printf(mon, "\n");
}
} else {
- monitor_printf(mon, "There is no suitable snapshot available\n");
+ monitor_printf(mon, "None\n");
}
+ QTAILQ_FOREACH(image_entry, &image_list, next) {
+ if (QTAILQ_EMPTY(&image_entry->snapshots)) {
+ continue;
+ }
+ monitor_printf(mon,
+ "\nList of partial (non-loadable) snapshots on '%s':\n",
+ image_entry->imagename);
+ bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
+ monitor_printf(mon, "\n");
+ QTAILQ_FOREACH(snapshot_entry, &image_entry->snapshots, next) {
+ bdrv_snapshot_dump((fprintf_function)monitor_printf, mon,
+ &snapshot_entry->sn);
+ monitor_printf(mon, "\n");
+ }
+ }
+
+ QTAILQ_FOREACH_SAFE(image_entry, &image_list, next, next_ie) {
+ SnapshotEntry *next_sn;
+ QTAILQ_FOREACH_SAFE(snapshot_entry, &image_entry->snapshots, next,
+ next_sn) {
+ g_free(snapshot_entry);
+ }
+ g_free(image_entry);
+ }
g_free(sn_tab);
- g_free(available_snapshots);
+ g_free(global_snapshots);
}
