commit 939a1cc399adb92640d156097d528b6471c136ae
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Wed Jan 04 22:23:34 2012 +0000
committer Luiz Capitulino <lcapitulino@redhat.com> Wed Jan 18 10:23:39 2012 -0200
tree e459b5524103a382b7a271ab992c6fad7ac6298b
parent c1303596a196613f1a765f8a536319577b2bb844

block: use proper qerrors in qmp_block_resize

Let's report specific errors so that management tools and users can
identify the problem.

Two new qerrors are needed:
 * QERR_DEVICE_HAS_NO_MEDIUM for ENOMEDIUM
 * QERR_DEVICE_IS_READ_ONLY for EACCES

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

blockdev.c

diff --git a/blockdev.c b/blockdev.c
index 5d16137..1f83c88 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -848,11 +848,6 @@
     return 0;
 }
 
-/*
- * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
- * existing QERR_ macro mess is cleaned up.  A good example for better
- * error reports can be found in the qemu-img resize code.
- */
 void qmp_block_resize(const char *device, int64_t size, Error **errp)
 {
     BlockDriverState *bs;
@@ -864,12 +859,27 @@
     }
 
     if (size < 0) {
-        error_set(errp, QERR_UNDEFINED_ERROR);
+        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
         return;
     }
 
-    if (bdrv_truncate(bs, size)) {
+    switch (bdrv_truncate(bs, size)) {
+    case 0:
+        break;
+    case -ENOMEDIUM:
+        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+        break;
+    case -ENOTSUP:
+        error_set(errp, QERR_UNSUPPORTED);
+        break;
+    case -EACCES:
+        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
+        break;
+    case -EBUSY:
+        error_set(errp, QERR_DEVICE_IN_USE, device);
+        break;
+    default:
         error_set(errp, QERR_UNDEFINED_ERROR);
-        return;
+        break;
     }
 }