storage: lvm: use correct lv* command parameters

lvcreate want's the parent pool's name, not the pool path
lvchange and lvremove want lv specified as $vgname/$lvname

This largely worked before because these commands strip off a
starting /dev. But https://bugzilla.redhat.com/show_bug.cgi?id=714986
is from a user using a 'nested VG' that was having problems.

I couldn't find any info on nested LVM and the reporter never responded,
but I reproduced with XML that specified a valid source name, and
set target path to a symlink.

diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
index 6a235f683347f07ab82322d2c366d3904bfaccbf..9a91dd9a74475e2b0d757e8e81f3d632f525f580 100644 (file)
--- a/src/storage/storage_backend_logical.c
+++ b/src/storage/storage_backend_logical.c
@@ -672,7 +672,7 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
     char size[100];
     const char *cmdargvnew[] = {
         LVCREATE, "--name", vol->name, "-L", size,
-        pool->def->target.path, NULL
+        pool->def->source.name, NULL
     };
     const char *cmdargvsnap[] = {
         LVCREATE, "--name", vol->name, "-L", size,
@@ -778,23 +778,23 @@ virStorageBackendLogicalDeleteVol(virConnectPtr conn ATTRIBUTE_UNUSED,
                                   unsigned int flags)
 {
     int ret = -1;
+    char *volpath = NULL;
 
     virCommandPtr lvchange_cmd = NULL;
     virCommandPtr lvremove_cmd = NULL;
 
     virCheckFlags(0, -1);
 
-    virFileWaitForDevices();
+    if (virAsprintf(&volpath, "%s/%s",
+                    pool->def->source.name, vol->name) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
 
-    lvchange_cmd = virCommandNewArgList(LVCHANGE,
-                                        "-aln",
-                                        vol->target.path,
-                                        NULL);
+    virFileWaitForDevices();
 
-    lvremove_cmd = virCommandNewArgList(LVREMOVE,
-                                        "-f",
-                                        vol->target.path,
-                                        NULL);
+    lvchange_cmd = virCommandNewArgList(LVCHANGE, "-aln", volpath, NULL);
+    lvremove_cmd = virCommandNewArgList(LVREMOVE, "-f", volpath, NULL);
 
     if (virCommandRun(lvremove_cmd, NULL) < 0) {
         if (virCommandRun(lvchange_cmd, NULL) < 0) {
@@ -807,6 +807,7 @@ virStorageBackendLogicalDeleteVol(virConnectPtr conn ATTRIBUTE_UNUSED,
 
     ret = 0;
 cleanup:
+    VIR_FREE(volpath);
     virCommandFree(lvchange_cmd);
     virCommandFree(lvremove_cmd);
     return ret;