Re: [libvirt] [PATCH v3 6/8] qemu: snapshot: Break out redefine preparation to shared function

--- src/conf/snapshot_conf.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++ src/conf/snapshot_conf.h | 7 +++ src/libvirt_private.syms | 1 + src/qemu/qemu_driver.c | 131 +---------------------------------------- 4 files changed, 160 insertions(+), 129 deletions(-)

diff --git a/src/conf/snapshot_conf.c b/src/conf/snapshot_conf.c index 207a8fe..1fcc4cb 100644 --- a/src/conf/snapshot_conf.c +++ b/src/conf/snapshot_conf.c @@ -1099,3 +1099,153 @@ virDomainSnapshotIsExternal(virDomainSnapshotObjPtr snap) { return virDomainSnapshotDefIsExternal(snap->def); } + +int +virDomainSnapshotRedefinePrep(virDomainPtr domain, + virDomainObjPtr vm, + virDomainSnapshotDefPtr *defptr, + virDomainSnapshotObjPtr *snap, + bool *update_current, + unsigned int flags) +{ + virDomainSnapshotDefPtr def = *defptr; + int ret = -1; + int align_location; + int align_match;

+ char uuidstr[VIR_UUID_STRING_BUFLEN]; + virDomainSnapshotObjPtr other; + + virUUIDFormat(domain->uuid, uuidstr); + + /* Prevent circular chains */ + if (def->parent) { + if (STREQ(def->name, def->parent)) { + virReportError(VIR_ERR_INVALID_ARG, + _("cannot set snapshot %s as its own parent"), + def->name); + goto cleanup; + } + other = virDomainSnapshotFindByName(vm->snapshots, def->parent); + if (!other) { + virReportError(VIR_ERR_INVALID_ARG, + _("parent %s for snapshot %s not found"), + def->parent, def->name); + goto cleanup; + } + while (other->def->parent) { + if (STREQ(other->def->parent, def->name)) { + virReportError(VIR_ERR_INVALID_ARG, + _("parent %s would create cycle to %s"), + other->def->name, def->name); + goto cleanup; + } + other = virDomainSnapshotFindByName(vm->snapshots, + other->def->parent); + if (!other) { + VIR_WARN("snapshots are inconsistent for %s", + vm->def->name); + break; + } + } + } + + /* Check that any replacement is compatible */ + if ((flags & VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY) && + def->state != VIR_DOMAIN_DISK_SNAPSHOT) { + virReportError(VIR_ERR_INVALID_ARG, + _("disk-only flag for snapshot %s requires " + "disk-snapshot state"), + def->name); + goto cleanup; + + } + + if (def->dom && + memcmp(def->dom->uuid, domain->uuid, VIR_UUID_BUFLEN)) { + virReportError(VIR_ERR_INVALID_ARG, + _("definition for snapshot %s must use uuid %s"), + def->name, uuidstr); + goto cleanup; + } + + other = virDomainSnapshotFindByName(vm->snapshots, def->name); + if (other) { + if ((other->def->state == VIR_DOMAIN_RUNNING || + other->def->state == VIR_DOMAIN_PAUSED) != + (def->state == VIR_DOMAIN_RUNNING || + def->state == VIR_DOMAIN_PAUSED)) { + virReportError(VIR_ERR_INVALID_ARG, + _("cannot change between online and offline " + "snapshot state in snapshot %s"), + def->name); + goto cleanup; + } + + if ((other->def->state == VIR_DOMAIN_DISK_SNAPSHOT) != + (def->state == VIR_DOMAIN_DISK_SNAPSHOT)) { + virReportError(VIR_ERR_INVALID_ARG, + _("cannot change between disk snapshot and " + "system checkpoint in snapshot %s"), + def->name); + goto cleanup; + } + + if (other->def->dom) { + if (def->dom) { + if (!virDomainDefCheckABIStability(other->def->dom, + def->dom)) + goto cleanup; + } else { + /* Transfer the domain def */ + def->dom = other->def->dom; + other->def->dom = NULL; + } + } + + if (def->dom) { + if (def->state == VIR_DOMAIN_DISK_SNAPSHOT || + virDomainSnapshotDefIsExternal(def)) { + align_location = VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL; + align_match = false; + } + + if (virDomainSnapshotAlignDisks(def, align_location, + align_match) < 0) {

+ /* revert stealing of the snapshot domain definition */ + if (def->dom && !other->def->dom) { + other->def->dom = def->dom; + def->dom = NULL; + } + goto cleanup; + } + }