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snapshot: create bdrv_all_delete_snapshot helper 

to delete snapshots from all loaded block drivers.

The patch also ensures proper locking.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Juan Quintela <quintela@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>
This commit is contained in:
Denis V. Lunev 2015-11-19 09:42:03 +03:00 committed by Juan Quintela
parent 25af925fff
commit 9b00ea376d
3 changed files with 34 additions and 44 deletions
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22
block/snapshot.c
View File

@ -381,3 +381,25 @@ bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs)
*first_bad_bs = bs;
return ok;
}
int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs,
Error **err)
{
int ret = 0;
BlockDriverState *bs = NULL;
QEMUSnapshotInfo sn1, *snapshot = &sn1;
while (ret == 0 && (bs = bdrv_next(bs))) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs) &&
bdrv_snapshot_find(bs, snapshot, name) >= 0) {
ret = bdrv_snapshot_delete_by_id_or_name(bs, name, err);
}
aio_context_release(ctx);
}
*first_bad_bs = bs;
return ret;
}

2
include/block/snapshot.h
View File

@ -82,5 +82,7 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
* when appropriate for appropriate block drivers */
bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs);
int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bsd_bs,
Error **err);
#endif

54
migration/savevm.c
View File

@ -1916,35 +1916,6 @@ static BlockDriverState *find_vmstate_bs(void)
return NULL;
}
/*
* Deletes snapshots of a given name in all opened images.
*/
static int del_existing_snapshots(Monitor *mon, const char *name)
{
BlockDriverState *bs;
QEMUSnapshotInfo sn1, *snapshot = &sn1;
Error *err = NULL;
bs = NULL;
while ((bs = bdrv_next(bs))) {
if (bdrv_can_snapshot(bs) &&
bdrv_snapshot_find(bs, snapshot, name) >= 0) {
bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
if (err) {
monitor_printf(mon,
"Error while deleting snapshot on device '%s':"
" %s\n",
bdrv_get_device_name(bs),
error_get_pretty(err));
error_free(err);
return -1;
}
}
}
return 0;
}
void hmp_savevm(Monitor *mon, const QDict *qdict)
{
BlockDriverState *bs, *bs1;
@ -2002,7 +1973,11 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
}
/* Delete old snapshots of the same name */
if (name && del_existing_snapshots(mon, name) < 0) {
if (name && bdrv_all_delete_snapshot(name, &bs1, &local_err) < 0) {
monitor_printf(mon,
"Error while deleting snapshot on device '%s': %s\n",
bdrv_get_device_name(bs1), error_get_pretty(local_err));
error_free(local_err);
goto the_end;
}
@ -2162,20 +2137,11 @@ void hmp_delvm(Monitor *mon, const QDict *qdict)
return;
}
bs = NULL;
while ((bs = bdrv_next(bs))) {
if (bdrv_can_snapshot(bs)) {
err = NULL;
bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
if (err) {
monitor_printf(mon,
"Error while deleting snapshot on device '%s':"
" %s\n",
bdrv_get_device_name(bs),
error_get_pretty(err));
error_free(err);
}
}
if (bdrv_all_delete_snapshot(name, &bs, &err) < 0) {
monitor_printf(mon,
"Error while deleting snapshot on device '%s': %s\n",
bdrv_get_device_name(bs), error_get_pretty(err));
error_free(err);
}
}