[libvirt] [PATCH v2 3/6] logical: Search for a segtype of "thin" and mark lv as sparse

[John Ferlan]

For any "thin" lv's, mark the volume as a sparse volume so that the
volume wipe algorithm doesn't work.  Currently thin lv's are ignored
because the regex requires 1 or more 'devices' listed in order to
process. However, a future patch will be changing this.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/storage/storage_backend_logical.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
index 3232c08..a9c6309 100644
--- a/src/storage/storage_backend_logical.c
+++ b/src/storage/storage_backend_logical.c
@@ -64,6 +64,8 @@ virStorageBackendLogicalSetActive(virStoragePoolObjPtr pool,
 }
 
 
+#define VIR_STORAGE_VOL_LOGICAL_SEGTYPE_THIN "thin"
+
 struct virStorageBackendLogicalPoolVolData {
     virStoragePoolObjPtr pool;
     virStorageVolDefPtr vol;
@@ -201,12 +203,15 @@ virStorageBackendLogicalMakeVol(char **const groups,
     }
 
     /* Mark the (s) sparse/snapshot lv, e.g. the lv created using
-     * the --virtualsize/-V option. We've already ignored the (t)hin
+     * the --virtualsize/-V option or a thin segtype as sparse. This
+     * will make sure the volume wipe algorithm doesn't overwrite
+     * a sparse/thin volumes. We've already ignored the (t)hin
      * pool definition. In the manner libvirt defines these, the
      * thin pool is hidden to the lvs output, except as the name
      * in brackets [] described for the groups[1] (backingStore).
      */
-    if (attrs[0] == 's')
+    if (attrs[0] == 's' ||
+        STREQ(groups[4], VIR_STORAGE_VOL_LOGICAL_SEGTYPE_THIN))
         vol->target.sparse = true;
 
     /* Skips the backingStore of lv created with "--virtualsize",
-- 
2.5.0