Re: [libvirt] [PATCH 02/20] snapshot: improve disk align checking

From: Eric Blake&lt;eblake(a)redhat.com&gt; There were not previous callers with require_match set to true. I originally implemented this bool with the intent of supporting ESX snapshot semantics, where the choice of internal vs. external vs. non-checkpointable must be made at domain start, but as ESX has not been wired up to use it yet, we might as well fix it to work with our next qemu patch for now, and worry about any further improvements (changing the bool to a flags argument) if the ESX driver decides to use this function in the future. * src/conf/snapshot_conf.c (virDomainSnapshotAlignDisks): Alter logic when require_match is true to deal with new XML. --- src/conf/snapshot_conf.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/src/conf/snapshot_conf.c b/src/conf/snapshot_conf.c index 6f77026..691950a 100644 --- a/src/conf/snapshot_conf.c +++ b/src/conf/snapshot_conf.c @@ -368,9 +368,8 @@ disksorter(const void *a, const void *b) * the domain, with a fallback to a passed in default. Convert paths * to disk targets for uniformity. Issue an error and return -1 if * any def->disks[n]->name appears more than once or does not map to - * dom->disks. If require_match, also require that existing - * def->disks snapshot states do not override explicit def->dom - * settings. */ + * dom->disks. If require_match, also ensure that there is no + * conflicting requests for both internal and external snapshots. */ int virDomainSnapshotAlignDisks(virDomainSnapshotDefPtr def, int default_snapshot, @@ -416,7 +415,6 @@ virDomainSnapshotAlignDisks(virDomainSnapshotDefPtr def, _("no disk named '%s'"), disk->name); goto cleanup; } - disk_snapshot = def->dom->disks[idx]->snapshot; if (virBitmapGetBit(map, idx,&inuse)< 0 || inuse) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, @@ -426,15 +424,22 @@ virDomainSnapshotAlignDisks(virDomainSnapshotDefPtr def, } ignore_value(virBitmapSetBit(map, idx)); disk->index = idx; - if (!disk_snapshot) - disk_snapshot = default_snapshot; + + disk_snapshot = def->dom->disks[idx]->snapshot; if (!disk->snapshot) { - disk->snapshot = disk_snapshot; - } else if (disk_snapshot&& require_match&& - disk->snapshot != disk_snapshot) { + if (disk_snapshot&& + (!require_match || + disk_snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_NONE)) + disk->snapshot = disk_snapshot; + else + disk->snapshot = default_snapshot; + } else if (require_match&& + disk->snapshot != default_snapshot&& + !(disk->snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_NONE&& + disk_snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_NONE)) { const char *tmp; - tmp = virDomainSnapshotLocationTypeToString(disk_snapshot); + tmp = virDomainSnapshotLocationTypeToString(default_snapshot); virReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("disk '%s' must use snapshot mode '%s'"), disk->name, tmp);