[libvirt] [PATCH] Drop virStorageBackendLogicalMatchPoolSource

[Ján Tomko]

Regression introduced by commit 71b803a for [1] that prevents starting up
a logical pool created with <source><device path=''></source>
after it has been moved to a different physical volume.

For logical pools <source><name> contains the name of the volume group
and uniquely identifies the VG on the host.

This also speeds up startup for pools that do not have any <device>s
specified.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1025230
---
 src/storage/storage_backend_logical.c | 104 +---------------------------------
 1 file changed, 2 insertions(+), 102 deletions(-)

diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
index ca05fe1..057e0b9 100644
--- a/src/storage/storage_backend_logical.c
+++ b/src/storage/storage_backend_logical.c
@@ -558,107 +558,11 @@ virStorageBackendLogicalFindPoolSources(virConnectPtr conn ATTRIBUTE_UNUSED,
 }
 
 
-/*
- * virStorageBackendLogicalMatchPoolSource
- * @pool: Pointer to the source pool object
- *
- * Search the output generated by a 'pvs --noheadings -o pv_name,vg_name'
- * to match the 'vg_name' with the pool def->source.name and for the list
- * of pool def->source.devices[].
- *
- * Returns true if the volume group name matches the pool's source.name
- * and at least one of the pool's def->source.devices[] matches the
- * list of physical device names listed for the pool. Return false if
- * we cannot find a matching volume group name and if we cannot match
- * the any device list members.
- */
-static bool
-virStorageBackendLogicalMatchPoolSource(virStoragePoolObjPtr pool)
-{
-    virStoragePoolSourceList sourceList;
-    virStoragePoolSource *thisSource = NULL;
-    size_t i, j;
-    int matchcount = 0;
-    bool ret = false;
-
-    memset(&sourceList, 0, sizeof(sourceList));
-    sourceList.type = VIR_STORAGE_POOL_LOGICAL;
-
-    if (virStorageBackendLogicalGetPoolSources(&sourceList) < 0)
-        goto cleanup;
-
-    /* Search the pvs output for this pool's source.name */
-    for (i = 0; i < sourceList.nsources; i++) {
-        thisSource = &sourceList.sources[i];
-        if (STREQ(thisSource->name, pool->def->source.name))
-            break;
-    }
-
-    if (i == sourceList.nsources) {
-        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                       _("cannot find logical volume group name '%s'"),
-                       pool->def->source.name);
-        goto cleanup;
-    }
-
-    /* If the pool has defined source device(s), then let's make sure
-     * they match as well; otherwise, matching can only occur on the
-     * pool's name.
-     */
-    if (!pool->def->source.ndevice) {
-        ret = true;
-        goto cleanup;
-    }
-
-    /* Let's make sure the pool's device(s) match what the pvs output has
-     * for volume group devices.
-     */
-    for (i = 0; i < pool->def->source.ndevice; i++) {
-        for (j = 0; j < thisSource->ndevice; j++) {
-            if (STREQ(pool->def->source.devices[i].path,
-                      thisSource->devices[j].path))
-                matchcount++;
-        }
-    }
-
-    /* If we didn't find any matches, then this pool has listed (a) source
-     * device path(s) that don't/doesn't match what was created for the pool
-     */
-    if (matchcount == 0) {
-        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                       _("cannot find any matching source devices for logical "
-                         "volume group '%s'"), pool->def->source.name);
-        goto cleanup;
-    }
-
-    /* Either there's more devices in the pool source device list or there's
-     * more devices in the pvs output. Could easily happen if someone decides
-     * to 'add' to or 'remove' from the volume group outside of libvirt's
-     * knowledge. Rather than fail on that, provide a warning and move on.
-     */
-    if (matchcount != pool->def->source.ndevice)
-        VIR_WARN("pool device list count doesn't match pvs device list count");
-
-    ret = true;
-
- cleanup:
-    for (i = 0; i < sourceList.nsources; i++)
-        virStoragePoolSourceClear(&sourceList.sources[i]);
-    VIR_FREE(sourceList.sources);
-
-    return ret;
-}
-
-
 static int
 virStorageBackendLogicalCheckPool(virStoragePoolObjPtr pool,
                                   bool *isActive)
 {
-    /* If we can find the target.path as well as ensure that the
-     * pool's def source
-     */
-    *isActive = virFileExists(pool->def->target.path) &&
-                virStorageBackendLogicalMatchPoolSource(pool);
+    *isActive = virFileExists(pool->def->target.path);
     return 0;
 }
 
@@ -666,11 +570,7 @@ static int
 virStorageBackendLogicalStartPool(virConnectPtr conn ATTRIBUTE_UNUSED,
                                   virStoragePoolObjPtr pool)
 {
-    /* Let's make sure that the pool's name matches the pvs output and
-     * that the pool's source devices match the pvs output.
-     */
-    if (!virStorageBackendLogicalMatchPoolSource(pool) ||
-        virStorageBackendLogicalSetActive(pool, 1) < 0)
+    if (virStorageBackendLogicalSetActive(pool, 1) < 0)
         return -1;
 
     return 0;
-- 
2.7.3