[libvirt] [PATCH v2 5/8] storageVolWipePattern: Don't take shortcut to refreshPool()

[Michal Privoznik]

In d16f803d780 we've tried to solve an issue that after wiping an
image its format might have changed (e.g. from qcow2 to raw) but
libvirt wasn't probing the image format. We fixed this by calling
virStorageBackendRefreshVolTargetUpdate() which is what
refreshPool() would end up calling. But this shortcut is not good
enough because the function is called only for local types of
volumes (like dir, fs, netfs). But now that more backends support
volume wiping we have to call the function with more caution.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/storage/storage_driver.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index 98be434005..cefffdfd64 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -2525,11 +2525,15 @@ storageVolWipePattern(virStorageVolPtr vol,
     if (rc < 0)
         goto cleanup;
 
-    /* Instead of using the refreshVol, since much changes on the target
-     * volume, let's update using the same function as refreshPool would
-     * use when it discovers a volume. The only failure to capture is -1,
-     * we can ignore -2. */
-    if (virStorageBackendRefreshVolTargetUpdate(voldef) == -1)
+    /* For local volumes, Instead of using the refreshVol, since
+     * much changes on the target volume, let's update using the
+     * same function as refreshPool would use when it discovers a
+     * volume. The only failure to capture is -1, we can ignore
+     * -2. */
+    if ((backend->type == VIR_STORAGE_POOL_DIR ||
+         backend->type == VIR_STORAGE_POOL_FS ||
+         backend->type == VIR_STORAGE_POOL_NETFS) &&
+        virStorageBackendRefreshVolTargetUpdate(voldef) == -1)
         goto cleanup;
 
     ret = 0;
-- 
2.19.2