[libvirt] [PATCH v2] Source control for storage pool

[Lei Li]

Fix bug #611823 storage driver should prohibit pools with duplicate underlying
storage.

Add API virStoragePoolSourceFindDuplicate() to do uniqueness check based on
source location infomation for pool type.


Signed-off-by: Lei Li <lilei at linux.vnet.ibm.com>
---
 src/conf/storage_conf.c      |   80 ++++++++++++++++++++++++++++++++++++++++++
 src/conf/storage_conf.h      |    5 +++
 src/libvirt_private.syms     |    2 +
 src/storage/storage_driver.c |    6 +++
 4 files changed, 93 insertions(+), 0 deletions(-)

diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c
index 8d14e87..1e7da69 100644
--- a/src/conf/storage_conf.c
+++ b/src/conf/storage_conf.c
@@ -1311,6 +1311,21 @@ virStoragePoolObjFindByName(virStoragePoolObjListPtr pools,
     return NULL;
 }
 
+virStoragePoolObjPtr
+virStoragePoolSourceFindDuplicateDevices(virStoragePoolObjPtr pool,
+                                         virStoragePoolDefPtr def) {
+    unsigned int i, j;
+
+    for (i = 0; i < pool->def->source.ndevice; i++) {
+        for (j = 0; j < def->source.ndevice; j++) {
+            if (STREQ(pool->def->source.devices[i].path, def->source.devices[j].path))
+                return pool;
+        }
+    }
+
+    return NULL;
+}
+
 void
 virStoragePoolObjClearVols(virStoragePoolObjPtr pool)
 {
@@ -1701,6 +1716,71 @@ cleanup:
     return ret;
 }
 
+int virStoragePoolSourceFindDuplicate(virStoragePoolObjListPtr pools,
+                                      virStoragePoolDefPtr def)
+{
+    int i;
+    int ret = 1;
+    virStoragePoolObjPtr pool = NULL;
+    virStoragePoolObjPtr matchpool = NULL;
+
+    /* Check the pool list for duplicate underlying storage */
+    for (i = 0; i < pools->count; i++) {
+        pool = pools->objs[i];
+        if (def->type != pool->def->type)
+            continue;
+
+        virStoragePoolObjLock(pool);
+
+        switch (pool->def->type) {
+        case VIR_STORAGE_POOL_DIR:
+            if (STREQ(pool->def->target.path, def->target.path))
+                matchpool = pool;
+            break;
+        case VIR_STORAGE_POOL_NETFS:
+            if ((STREQ(pool->def->source.dir, def->source.dir)) \
+                && (STREQ(pool->def->source.host.name, def->source.host.name)))
+                matchpool = pool;
+            break;
+        case VIR_STORAGE_POOL_SCSI:
+            if (STREQ(pool->def->source.adapter, def->source.adapter))
+                matchpool = pool;
+            break;
+        case VIR_STORAGE_POOL_ISCSI:
+        {
+            matchpool = virStoragePoolSourceFindDuplicateDevices(pool, def);
+            if (matchpool) {
+                if (STREQ(matchpool->def->source.host.name, def->source.host.name)) {
+                    if ((matchpool->def->source.initiator.iqn) && (def->source.initiator.iqn)) {
+                        if (STREQ(matchpool->def->source.initiator.iqn, def->source.initiator.iqn))
+                            break;
+                        matchpool = NULL;
+                    }
+                    break;
+                }
+                matchpool = NULL;
+            }
+            break;
+        }
+        case VIR_STORAGE_POOL_FS:
+        case VIR_STORAGE_POOL_LOGICAL:
+        case VIR_STORAGE_POOL_DISK:
+            matchpool = virStoragePoolSourceFindDuplicateDevices(pool, def);
+            break;
+        default:
+            break;
+        }
+        virStoragePoolObjUnlock(pool);
+    }
+
+    if (matchpool) {
+        virStorageReportError(VIR_ERR_OPERATION_FAILED,
+                              _("Storage source conflict with pool: '%s'"),
+                              matchpool->def->name);
+        ret = -1;
+    }
+    return ret;
+}
 
 void virStoragePoolObjLock(virStoragePoolObjPtr obj)
 {
diff --git a/src/conf/storage_conf.h b/src/conf/storage_conf.h
index 271441a..d115a15 100644
--- a/src/conf/storage_conf.h
+++ b/src/conf/storage_conf.h
@@ -335,6 +335,8 @@ virStoragePoolObjPtr virStoragePoolObjFindByUUID(virStoragePoolObjListPtr pools,
                                                  const unsigned char *uuid);
 virStoragePoolObjPtr virStoragePoolObjFindByName(virStoragePoolObjListPtr pools,
                                                  const char *name);
+virStoragePoolObjPtr virStoragePoolSourceFindDuplicateDevices(virStoragePoolObjPtr pool,
+                                                              virStoragePoolDefPtr def);
 
 virStorageVolDefPtr virStorageVolDefFindByKey(virStoragePoolObjPtr pool,
                                               const char *key);
@@ -388,6 +390,9 @@ int virStoragePoolObjIsDuplicate(virStoragePoolObjListPtr pools,
                                  virStoragePoolDefPtr def,
                                  unsigned int check_active);
 
+int virStoragePoolSourceFindDuplicate(virStoragePoolObjListPtr pools,
+                                      virStoragePoolDefPtr def);
+
 void virStoragePoolObjLock(virStoragePoolObjPtr obj);
 void virStoragePoolObjUnlock(virStoragePoolObjPtr obj);
 
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 9f03e30..316eb7e 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -947,7 +947,9 @@ virStoragePoolObjClearVols;
 virStoragePoolObjDeleteDef;
 virStoragePoolObjFindByName;
 virStoragePoolObjFindByUUID;
+virStoragePoolSourceFindDuplicateDevices;
 virStoragePoolObjIsDuplicate;
+virStoragePoolSourceFindDuplicate;
 virStoragePoolObjListFree;
 virStoragePoolObjLock;
 virStoragePoolObjRemove;
diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index 68cac1f..c05b74e 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -536,6 +536,9 @@ storagePoolCreate(virConnectPtr conn,
     if (virStoragePoolObjIsDuplicate(&driver->pools, def, 1) < 0)
         goto cleanup;
 
+    if (virStoragePoolSourceFindDuplicate(&driver->pools, def) < 0)
+        goto cleanup;
+
     if ((backend = virStorageBackendForType(def->type)) == NULL)
         goto cleanup;
 
@@ -589,6 +592,9 @@ storagePoolDefine(virConnectPtr conn,
     if (virStoragePoolObjIsDuplicate(&driver->pools, def, 0) < 0)
         goto cleanup;
 
+    if (virStoragePoolSourceFindDuplicate(&driver->pools, def) < 0)
+        goto cleanup;
+
     if (virStorageBackendForType(def->type) == NULL)
         goto cleanup;
 
-- 
1.7.1