* [Qemu-devel] [PATCH 1/2 V3] hmp: use snapshot name to determine whether a snapshot is 'fully available'
2016-06-29 7:43 [Qemu-devel] [PATCH 0/2 V3] Show all of snapshot info on every block dev Lin Ma
@ 2016-06-29 7:43 ` Lin Ma
2016-07-02 13:26 ` Max Reitz
2016-06-29 7:43 ` [Qemu-devel] [PATCH 2/2 V3] hmp: show all of snapshot info on every block dev in output of 'info snapshots' Lin Ma
1 sibling, 1 reply; 5+ messages in thread
From: Lin Ma @ 2016-06-29 7:43 UTC (permalink / raw)
To: mreitz, qemu-devel; +Cc: kwolf
Currently qemu uses snapshot id to determine whether a snapshot is fully
available, It causes incorrect output in some scenario.
For instance:
(qemu) info block
drive_image1 (#block113): /opt/vms/SLES12-SP1-JeOS-x86_64-GM/disk0.qcow2
(qcow2)
Cache mode: writeback
drive_image2 (#block349): /opt/vms/SLES12-SP1-JeOS-x86_64-GM/disk1.qcow2
(qcow2)
Cache mode: writeback
(qemu)
(qemu) info snapshots
There is no snapshot available.
(qemu)
(qemu) snapshot_blkdev_internal drive_image1 snap1
(qemu)
(qemu) info snapshots
There is no suitable snapshot available
(qemu)
(qemu) savevm checkpoint-1
(qemu)
(qemu) info snapshots
ID TAG VM SIZE DATE VM CLOCK
1 snap1 0 2016-05-22 16:57:31 00:01:30.567
(qemu)
$ qemu-img snapshot -l disk0.qcow2
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 snap1 0 2016-05-22 16:57:31 00:01:30.567
2 checkpoint-1 165M 2016-05-22 16:58:07 00:02:06.813
$ qemu-img snapshot -l disk1.qcow2
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 checkpoint-1 0 2016-05-22 16:58:07 00:02:06.813
The patch uses snapshot name instead of snapshot id to determine whether a
snapshot is fully available and uses '--' instead of snapshot id in output
because the snapshot id is not guaranteed to be the same on all images.
For instance:
(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
Signed-off-by: Lin Ma <lma@suse.com>
---
Reviewed-by: Max Reitz
migration/savevm.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/migration/savevm.c b/migration/savevm.c
index 38b85ee..a8f22da 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2230,7 +2230,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
available_snapshots = g_new0(int, nb_sns);
total = 0;
for (i = 0; i < nb_sns; i++) {
- if (bdrv_all_find_snapshot(sn_tab[i].id_str, &bs1) == 0) {
+ if (bdrv_all_find_snapshot(sn_tab[i].name, &bs1) == 0) {
available_snapshots[total] = i;
total++;
}
@@ -2241,6 +2241,10 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "\n");
for (i = 0; i < total; i++) {
sn = &sn_tab[available_snapshots[i]];
+ /* The ID is not guaranteed to be the same on all images, so
+ * overwrite it.
+ */
+ pstrcpy(sn->id_str, sizeof(sn->id_str), "--");
bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
monitor_printf(mon, "\n");
}
--
2.8.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [Qemu-devel] [PATCH 2/2 V3] hmp: show all of snapshot info on every block dev in output of 'info snapshots'
2016-06-29 7:43 [Qemu-devel] [PATCH 0/2 V3] Show all of snapshot info on every block dev Lin Ma
2016-06-29 7:43 ` [Qemu-devel] [PATCH 1/2 V3] hmp: use snapshot name to determine whether a snapshot is 'fully available' Lin Ma
@ 2016-06-29 7:43 ` Lin Ma
2016-07-02 13:34 ` Max Reitz
1 sibling, 1 reply; 5+ messages in thread
From: Lin Ma @ 2016-06-29 7:43 UTC (permalink / raw)
To: mreitz, qemu-devel; +Cc: kwolf
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>
---
migration/savevm.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 88 insertions(+), 7 deletions(-)
diff --git a/migration/savevm.c b/migration/savevm.c
index a8f22da..e5a5536 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2200,12 +2200,31 @@ void hmp_delvm(Monitor *mon, const QDict *qdict)
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;
+ 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 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
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 +2308,33 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
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(image_entry, &image_list, next) {
+ QTAILQ_FOREACH(snapshot_entry, &image_entry->snapshots, next) {
+ g_free(snapshot_entry);
+ }
+ g_free(image_entry);
+ }
g_free(sn_tab);
- g_free(available_snapshots);
+ g_free(global_snapshots);
}
--
2.8.1
^ permalink raw reply related [flat|nested] 5+ messages in thread