[PATCH 2/3] storage: Forbid to shrink the vol's capacity if no --shrink is specified

[Osier Yang <jyang@xxxxxxxxxx>]

As the document for "virsh-resize" says:
<...>
Attempts to shrink the volume will fail unless I<--shrink> is present;
</...>

This makes sense as it at least prevent the user shrinking the important
data of volume without a notice.
---
 src/storage/storage_driver.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index e7516eb..858aeca 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -1762,7 +1762,8 @@ storageVolResize(virStorageVolPtr obj,
     int ret = -1;
 
     virCheckFlags(VIR_STORAGE_VOL_RESIZE_ALLOCATE |
-                  VIR_STORAGE_VOL_RESIZE_DELTA, -1);
+                  VIR_STORAGE_VOL_RESIZE_DELTA |
+                  VIR_STORAGE_VOL_RESIZE_SHRINK, -1);
 
     storageDriverLock(driver);
     pool = virStoragePoolObjFindByName(&driver->pools, obj->pool);
@@ -1814,6 +1815,14 @@ storageVolResize(virStorageVolPtr obj,
         goto out;
     }
 
+    if (abs_capacity < vol->capacity &&
+        !(flags & VIR_STORAGE_VOL_RESIZE_SHRINK)) {
+        virReportError(VIR_ERR_INVALID_ARG, "%s",
+                       _("Can't shrink capacity below current "
+                         "capacity with shrink flag explicitly specified"));
+        goto out;
+    }
+
     if (abs_capacity > vol->capacity + pool->def->available) {
         virReportError(VIR_ERR_OPERATION_FAILED, "%s",
                        _("Not enough space left on storage pool"));
-- 
1.8.1.4

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