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block: rename and alter bdrv_all_find_snapshot semantics 

Currently bdrv_all_find_snapshot() will return 0 if it finds
a snapshot, -1 if an error occurs, or if it fails to find a
snapshot. New callers to be added want to distinguish between
the error scenario and failing to find a snapshot.

Rename it to bdrv_all_has_snapshot and make it return -1 on
error, 0 if no snapshot is found and 1 if snapshot is found.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210204124834.774401-7-berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-02-04 12:48:28 +00:00 committed by Dr. David Alan Gilbert
parent c22d644ca7
commit 3d3e9b1f66
5 changed files with 27 additions and 13 deletions
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2
block/monitor/block-hmp-cmds.c
View File

@ -954,7 +954,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
total = 0;
for (i = 0; i < nb_sns; i++) {
SnapshotEntry *next_sn;
if (bdrv_all_find_snapshot(sn_tab[i].name, false, NULL, NULL) == 0) {
if (bdrv_all_has_snapshot(sn_tab[i].name, false, NULL, NULL) == 1) {
global_snapshots[total] = i;
total++;
QTAILQ_FOREACH(image_entry, &image_list, next) {

19
block/snapshot.c
View File

@ -603,9 +603,9 @@ int bdrv_all_goto_snapshot(const char *name,
return 0;
}
int bdrv_all_find_snapshot(const char *name,
bool has_devices, strList *devices,
Error **errp)
int bdrv_all_has_snapshot(const char *name,
bool has_devices, strList *devices,
Error **errp)
{
g_autoptr(GList) bdrvs = NULL;
GList *iterbdrvs;
@ -627,15 +627,20 @@ int bdrv_all_find_snapshot(const char *name,
}
aio_context_release(ctx);
if (ret < 0) {
error_setg(errp, "Could not find snapshot '%s' on '%s'",
name, bdrv_get_device_or_node_name(bs));
return -1;
if (ret == -ENOENT) {
return 0;
} else {
error_setg_errno(errp, errno,
"Could not check snapshot '%s' on '%s'",
name, bdrv_get_device_or_node_name(bs));
return -1;
}
}
iterbdrvs = iterbdrvs->next;
}
return 0;
return 1;
}
int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,

6
include/block/snapshot.h
View File

@ -85,9 +85,9 @@ int bdrv_all_delete_snapshot(const char *name,
int bdrv_all_goto_snapshot(const char *name,
bool has_devices, strList *devices,
Error **errp);
int bdrv_all_find_snapshot(const char *name,
bool has_devices, strList *devices,
Error **errp);
int bdrv_all_has_snapshot(const char *name,
bool has_devices, strList *devices,
Error **errp);
int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
BlockDriverState *vm_state_bs,
uint64_t vm_state_size,

7
migration/savevm.c
View File

@ -2977,10 +2977,15 @@ bool load_snapshot(const char *name, Error **errp)
if (!bdrv_all_can_snapshot(false, NULL, errp)) {
return false;
}
ret = bdrv_all_find_snapshot(name, false, NULL, errp);
ret = bdrv_all_has_snapshot(name, false, NULL, errp);
if (ret < 0) {
return false;
}
if (ret == 0) {
error_setg(errp, "Snapshot '%s' does not exist in one or more devices",
name);
return false;
}
bs_vm_state = bdrv_all_find_vmstate_bs(NULL, false, NULL, errp);
if (!bs_vm_state) {

6
replay/replay-debugging.c
View File

@ -143,6 +143,7 @@ static char *replay_find_nearest_snapshot(int64_t icount,
QEMUSnapshotInfo *sn_tab;
QEMUSnapshotInfo *nearest = NULL;
char *ret = NULL;
int rv;
int nb_sns, i;
AioContext *aio_context;
@ -159,7 +160,10 @@ static char *replay_find_nearest_snapshot(int64_t icount,
aio_context_release(aio_context);
for (i = 0; i < nb_sns; i++) {
if (bdrv_all_find_snapshot(sn_tab[i].name, false, NULL, NULL) == 0) {
rv = bdrv_all_has_snapshot(sn_tab[i].name, false, NULL, NULL);
if (rv < 0)
goto fail;
if (rv == 1) {
if (sn_tab[i].icount != -1ULL
&& sn_tab[i].icount <= icount
&& (!nearest || nearest->icount < sn_tab[i].icount)) {