Re: [Qemu-devel] [PATCH 11/11] savevm: remove backward compatibility from bdrv_snapshot_find()

[Pavel Hrdina <phrdina@redhat.com>]

Hi Wenchao,

unfortunately no. According to new design of savevm, loadvm and delvm I
need also search for snapshots that have the specified name and id.

I'm also touching bdrv_snapshot_list where I'm adding an Error parameter
and changing the return value to be used only for getting a number of
snapshots. So in case that there is some error, the return value will be 0.

Pavel

On 17.4.2013 04:53, Wenchao Xia wrote:
> Hi, Pavel
>    I have implemented it at
> http://lists.nongnu.org/archive/html/qemu-devel/2013-04/msg02533.html
> in patch 1,2. Could u check if it satisfy your requirement, if yes maybe
> you can directly use them.
> 
>> Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
>> ---
>>    savevm.c | 33 +++++++++++----------------------
>>    1 file changed, 11 insertions(+), 22 deletions(-)
>>
>> diff --git a/savevm.c b/savevm.c
>> index 66753da..bc829a5 100644
>> --- a/savevm.c
>> +++ b/savevm.c
>> @@ -2195,7 +2195,7 @@ out:
>>    }
>>
>>    static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
>> -                              const char *name, const char *id, bool old_match)
>> +                              const char *name, const char *id)
>>    {
>>        QEMUSnapshotInfo *sn_tab, *sn;
>>        int nb_sns, i, found = 0;
>> @@ -2218,20 +2218,10 @@ static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
>>                    break;
>>                }
>>            } else if (name) {
>> -            /* for compatibility for old bdrv_snapshot_find call
>> -             * will be removed */
>> -            if (old_match) {
>> -                if (!strcmp(sn->id_str, id) || !strcmp(sn->name, name)) {
>> -                    *sn_info = *sn;
>> -                    found = 1;
>> -                    break;
>> -                }
>> -            } else {
>> -                if (!strcmp(sn->name, name)) {
>> -                    *sn_info = *sn;
>> -                    found = 1;
>> -                    break;
>> -                }
>> +            if (!strcmp(sn->name, name)) {
>> +                *sn_info = *sn;
>> +                found = 1;
>> +                break;
>>                }
>>            } else if (id) {
>>                if (!strcmp(sn->id_str, id)) {
>> @@ -2290,7 +2280,7 @@ SnapshotInfo *qmp_vm_snapshot_save(const char *name, Error **errp)
>>        sn->date_nsec = tv.tv_usec * 1000;
>>        sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
>>
>> -    if (bdrv_snapshot_find(bs, old_sn, name, NULL, false)) {
>> +    if (bdrv_snapshot_find(bs, old_sn, name, NULL)) {
>>            error_setg(errp, "snapshot '%s' exists", name);
>>            goto the_end;
>>        } else {
>> @@ -2388,7 +2378,7 @@ SnapshotInfo *qmp_vm_snapshot_load(bool has_name, const char *name,
>>        }
>>
>>        /* Don't even try to load empty VM states */
>> -    if (!bdrv_snapshot_find(bs_vm_state, &sn, name, id, false)) {
>> +    if (!bdrv_snapshot_find(bs_vm_state, &sn, name, id)) {
>>            return NULL;
>>        }
>>
>> @@ -2413,7 +2403,7 @@ SnapshotInfo *qmp_vm_snapshot_load(bool has_name, const char *name,
>>                return NULL;
>>            }
>>
>> -        if (!bdrv_snapshot_find(bs, &sn, name, id, false)) {
>> +        if (!bdrv_snapshot_find(bs, &sn, name, id)) {
>>                return NULL;
>>            }
>>        }
>> @@ -2484,7 +2474,7 @@ SnapshotInfo *qmp_vm_snapshot_delete(const bool has_name, const char *name,
>>            return NULL;
>>        }
>>
>> -    if (!bdrv_snapshot_find(bs, &sn, name, id, false)) {
>> +    if (!bdrv_snapshot_find(bs, &sn, name, id)) {
>>            /* no need to set an error if snapshot doesn't exist */
>>            return NULL;
>>        }
>> @@ -2501,7 +2491,7 @@ SnapshotInfo *qmp_vm_snapshot_delete(const bool has_name, const char *name,
>>        bs = NULL;
>>        while ((bs = bdrv_next(bs))) {
>>            if (bdrv_can_snapshot(bs)
>> -                && bdrv_snapshot_find(bs, &sn, name, id, false)) {
>> +                && bdrv_snapshot_find(bs, &sn, name, id)) {
>>                bdrv_snapshot_delete(bs, sn.name, errp);
>>                if (error_is_set(errp)) {
>>                    return NULL;
>> @@ -2549,8 +2539,7 @@ void do_info_snapshots(Monitor *mon, const QDict *qdict)
>>
>>            while ((bs1 = bdrv_next(bs1))) {
>>                if (bdrv_can_snapshot(bs1) && bs1 != bs) {
>> -                if (!bdrv_snapshot_find(bs1, sn_info, sn->name, sn->id_str,
>> -                                        true)) {
>> +                if (!bdrv_snapshot_find(bs1, sn_info, sn->name, sn->id_str)) {
>>                        available = 0;
>>                        break;
>>                    }
>>
> 
>