[libvirt] [RFC PATCH 10/12] qemu: domain: Add helper to look up disk soruce by the backing store string
---
src/qemu/qemu_domain.c | 37 +++++++++++++++++++++++++++++++++++++
src/qemu/qemu_domain.h | 3 +++
2 files changed, 40 insertions(+)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index b8a65cfd5..1740a9d80 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8341,3 +8341,40 @@ qemuDomainDiskBackingStoreGetName(virDomainDiskDefPtr disk,
return ret;
}
+
+
+virStorageSourcePtr
+qemuDomainGetStorageSourceByDevstr(const char *devstr,
+ virDomainDefPtr def)
+{
+ virDomainDiskDefPtr disk = NULL;
+ virStorageSourcePtr src = NULL;
+ char *target = NULL;
+ unsigned int idx;
+ size_t i;
+
+ if (virStorageFileParseBackingStoreStr(devstr, &target, &idx) < 0) {
+ virReportError(VIR_ERR_INVALID_ARG,
+ _("failed to parse block device '%s'"),
devstr);
+ return NULL;
+ }
+
+ for (i = 0; i < def->ndisks; i++) {
+ if (STREQ(target, def->disks[i]->dst)) {
+ disk = def->disks[i];
+ break;
+ }
+ }
+
+ if (!disk) {
+ virReportError(VIR_ERR_INVALID_ARG,
+ _("failed to find disk '%s"), target);
+ goto cleanup;
+ }
+
+ src = virStorageFileChainLookup(disk->src, NULL, NULL, idx, NULL);
+
+ cleanup:
+ VIR_FREE(target);
+ return src;
+}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 6e847c7ae..705a3ad59 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -859,4 +859,7 @@ char *qemuDomainDiskBackingStoreGetName(virDomainDiskDefPtr disk,
virStorageSourcePtr src,
unsigned int idx);
+virStorageSourcePtr qemuDomainGetStorageSourceByDevstr(const char *devstr,
+ virDomainDefPtr def);
+
#endif /* __QEMU_DOMAIN_H__ */
--
2.11.1