block: use bdrv_get_device_or_node_name() in error messages

There are several error messages that identify a BlockDriverState by
its device name. However those errors can be produced in nodes that
don't have a device name associated.

In those cases we should use bdrv_get_device_or_node_name() to fall
back to the node name and produce a more meaningful message. The
messages are also updated to use the more generic term 'node' instead
of 'device'.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 9823a1f0514fdb0692e92868661c38a9e00a12d6.1428485266.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

12 files changed, 46 insertions, 50 deletions

diff --git a/block.c b/block.c
index cc8010ee20..002972ad17 100644
--- a/block.c
+++ b/block.c
@@ -1231,8 +1231,8 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd)
         bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker);
     } else if (backing_hd) {
         error_setg(&bs->backing_blocker,
-                   "device is used as backing hd of '%s'",
-                   bdrv_get_device_name(bs));
+                   "node is used as backing hd of '%s'",
+                   bdrv_get_device_or_node_name(bs));
     }
 
     bs->backing_hd = backing_hd;
@@ -1819,8 +1819,8 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue,
      * to r/w */
     if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) &&
         reopen_state->flags & BDRV_O_RDWR) {
-        error_set(errp, QERR_DEVICE_IS_READ_ONLY,
-                  bdrv_get_device_name(reopen_state->bs));
+        error_setg(errp, "Node '%s' is read only",
+                   bdrv_get_device_or_node_name(reopen_state->bs));
         goto error;
     }
 
@@ -1846,9 +1846,9 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue,
     } else {
         /* It is currently mandatory to have a bdrv_reopen_prepare()
          * handler for each supported drv. */
-        error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-                  drv->format_name, bdrv_get_device_name(reopen_state->bs),
-                 "reopening of file");
+        error_setg(errp, "Block format '%s' used by node '%s' "
+                   "does not support reopening files", drv->format_name,
+                   bdrv_get_device_or_node_name(reopen_state->bs));
         ret = -1;
         goto error;
     }
@@ -3824,8 +3824,8 @@ void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp)
 {
     if (key) {
         if (!bdrv_is_encrypted(bs)) {
-            error_setg(errp, "Device '%s' is not encrypted",
-                      bdrv_get_device_name(bs));
+            error_setg(errp, "Node '%s' is not encrypted",
+                      bdrv_get_device_or_node_name(bs));
         } else if (bdrv_set_key(bs, key) < 0) {
             error_set(errp, QERR_INVALID_PASSWORD);
         }
@@ -3833,7 +3833,7 @@ void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp)
         if (bdrv_key_required(bs)) {
             error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED,
                       "'%s' (%s) is encrypted",
-                      bdrv_get_device_name(bs),
+                      bdrv_get_device_or_node_name(bs),
                       bdrv_get_encrypted_filename(bs));
         }
     }
@@ -5633,8 +5633,8 @@ bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp)
     if (!QLIST_EMPTY(&bs->op_blockers[op])) {
         blocker = QLIST_FIRST(&bs->op_blockers[op]);
         if (errp) {
-            error_setg(errp, "Device '%s' is busy: %s",
-                       bdrv_get_device_name(bs),
+            error_setg(errp, "Node '%s' is busy: %s",
+                       bdrv_get_device_or_node_name(bs),
                        error_get_pretty(blocker->reason));
         }
         return true;
diff --git a/block/qcow.c b/block/qcow.c
index 055896910e..ab893284d2 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -124,7 +124,7 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
         snprintf(version, sizeof(version), "QCOW version %" PRIu32,
                  header.version);
         error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
-                  bdrv_get_device_name(bs), "qcow", version);
+                  bdrv_get_device_or_node_name(bs), "qcow", version);
         ret = -ENOTSUP;
         goto fail;
     }
@@ -229,9 +229,9 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     /* Disable migration when qcow images are used */
-    error_set(&s->migration_blocker,
-              QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-              "qcow", bdrv_get_device_name(bs), "live migration");
+    error_setg(&s->migration_blocker, "The qcow format used by node '%s' "
+               "does not support live migration",
+               bdrv_get_device_or_node_name(bs));
     migrate_add_blocker(s->migration_blocker);
 
     qemu_co_mutex_init(&s->lock);
diff --git a/block/qcow2.c b/block/qcow2.c
index f692978a6c..6084eae4da 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -208,7 +208,7 @@ static void GCC_FMT_ATTR(3, 4) report_unsupported(BlockDriverState *bs,
     va_end(ap);
 
     error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
-              bdrv_get_device_name(bs), "qcow2", msg);
+              bdrv_get_device_or_node_name(bs), "qcow2", msg);
 }
 
 static void report_unsupported_feature(BlockDriverState *bs,
diff --git a/block/qed.c b/block/qed.c
index 9d908886da..5bbe069ce9 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -408,7 +408,7 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
         snprintf(buf, sizeof(buf), "%" PRIx64,
             s->header.features & ~QED_FEATURE_MASK);
         error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
-            bdrv_get_device_name(bs), "QED", buf);
+            bdrv_get_device_or_node_name(bs), "QED", buf);
         return -ENOTSUP;
     }
     if (!qed_is_cluster_size_valid(s->header.cluster_size)) {
diff --git a/block/snapshot.c b/block/snapshot.c
index 698e1a1d58..50ae610139 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -246,9 +246,9 @@ int bdrv_snapshot_delete(BlockDriverState *bs,
     if (bs->file) {
         return bdrv_snapshot_delete(bs->file, snapshot_id, name, errp);
     }
-    error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-              drv->format_name, bdrv_get_device_name(bs),
-              "internal snapshot deletion");
+    error_setg(errp, "Block format '%s' used by device '%s' "
+               "does not support internal snapshot deletion",
+               drv->format_name, bdrv_get_device_name(bs));
     return -ENOTSUP;
 }
 
@@ -329,9 +329,9 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs,
     if (drv->bdrv_snapshot_load_tmp) {
         return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp);
     }
-    error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-              drv->format_name, bdrv_get_device_name(bs),
-              "temporarily load internal snapshot");
+    error_setg(errp, "Block format '%s' used by device '%s' "
+               "does not support temporarily loading internal snapshots",
+               drv->format_name, bdrv_get_device_name(bs));
     return -ENOTSUP;
 }
 
diff --git a/block/vdi.c b/block/vdi.c
index 53bd02fe22..7642ef3597 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -502,9 +502,9 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     /* Disable migration when vdi images are used */
-    error_set(&s->migration_blocker,
-              QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-              "vdi", bdrv_get_device_name(bs), "live migration");
+    error_setg(&s->migration_blocker, "The vdi format used by node '%s' "
+               "does not support live migration",
+               bdrv_get_device_or_node_name(bs));
     migrate_add_blocker(s->migration_blocker);
 
     qemu_co_mutex_init(&s->write_lock);
diff --git a/block/vhdx.c b/block/vhdx.c
index e24062f22a..0776de7174 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1002,9 +1002,9 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
     /* TODO: differencing files */
 
     /* Disable migration when VHDX images are used */
-    error_set(&s->migration_blocker,
-            QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-            "vhdx", bdrv_get_device_name(bs), "live migration");
+    error_setg(&s->migration_blocker, "The vhdx format used by node '%s' "
+               "does not support live migration",
+               bdrv_get_device_or_node_name(bs));
     migrate_add_blocker(s->migration_blocker);
 
     return 0;
diff --git a/block/vmdk.c b/block/vmdk.c
index 8410a158a2..fd94b8f605 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -669,7 +669,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
         snprintf(buf, sizeof(buf), "VMDK version %" PRId32,
                  le32_to_cpu(header.version));
         error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
-                  bdrv_get_device_name(bs), "vmdk", buf);
+                  bdrv_get_device_or_node_name(bs), "vmdk", buf);
         return -ENOTSUP;
     } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) {
         /* VMware KB 2064959 explains that version 3 added support for
@@ -962,9 +962,9 @@ static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
     qemu_co_mutex_init(&s->lock);
 
     /* Disable migration when VMDK images are used */
-    error_set(&s->migration_blocker,
-              QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-              "vmdk", bdrv_get_device_name(bs), "live migration");
+    error_setg(&s->migration_blocker, "The vmdk format used by node '%s' "
+               "does not support live migration",
+               bdrv_get_device_or_node_name(bs));
     migrate_add_blocker(s->migration_blocker);
     g_free(buf);
     return 0;
diff --git a/block/vpc.c b/block/vpc.c
index 43e768ee76..37572bab86 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -318,9 +318,9 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
     qemu_co_mutex_init(&s->lock);
 
     /* Disable migration when VHD images are used */
-    error_set(&s->migration_blocker,
-              QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-              "vpc", bdrv_get_device_name(bs), "live migration");
+    error_setg(&s->migration_blocker, "The vpc format used by node '%s' "
+               "does not support live migration",
+               bdrv_get_device_or_node_name(bs));
     migrate_add_blocker(s->migration_blocker);
 
     return 0;
diff --git a/block/vvfat.c b/block/vvfat.c
index 9be632f404..e803589675 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1180,9 +1180,10 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
 
     /* Disable migration when vvfat is used rw */
     if (s->qcow) {
-        error_set(&s->migration_blocker,
-                  QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-                  "vvfat (rw)", bdrv_get_device_name(bs), "live migration");
+        error_setg(&s->migration_blocker,
+                   "The vvfat (rw) format used by node '%s' "
+                   "does not support live migration",
+                   bdrv_get_device_or_node_name(bs));
         migrate_add_blocker(s->migration_blocker);
     }
 
diff --git a/blockdev.c b/blockdev.c
index 9132d69e09..e67c701879 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1248,13 +1248,14 @@ static void internal_snapshot_prepare(BlkTransactionState *common,
     }
 
     if (bdrv_is_read_only(bs)) {
-        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
+        error_setg(errp, "Device '%s' is read only", device);
         return;
     }
 
     if (!bdrv_can_snapshot(bs)) {
-        error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-                  bs->drv->format_name, device, "internal snapshot");
+        error_setg(errp, "Block format '%s' used by device '%s' "
+                   "does not support internal snapshots",
+                   bs->drv->format_name, device);
         return;
     }
 
@@ -2055,7 +2056,7 @@ void qmp_block_resize(bool has_device, const char *device,
         error_set(errp, QERR_UNSUPPORTED);
         break;
     case -EACCES:
-        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
+        error_setg(errp, "Device '%s' is read only", device);
         break;
     case -EBUSY:
         error_set(errp, QERR_DEVICE_IN_USE, device);
diff --git a/include/qapi/qmp/qerror.h b/include/qapi/qmp/qerror.h
index 57a62d4b76..e5673394d3 100644
--- a/include/qapi/qmp/qerror.h
+++ b/include/qapi/qmp/qerror.h
@@ -37,9 +37,6 @@ void qerror_report_err(Error *err);
 #define QERR_BASE_NOT_FOUND \
     ERROR_CLASS_GENERIC_ERROR, "Base '%s' not found"
 
-#define QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED \
-    ERROR_CLASS_GENERIC_ERROR, "Block format '%s' used by device '%s' does not support feature '%s'"
-
 #define QERR_BLOCK_JOB_NOT_READY \
     ERROR_CLASS_GENERIC_ERROR, "The active block job for device '%s' cannot be completed"
 
@@ -58,9 +55,6 @@ void qerror_report_err(Error *err);
 #define QERR_DEVICE_IN_USE \
     ERROR_CLASS_GENERIC_ERROR, "Device '%s' is in use"
 
-#define QERR_DEVICE_IS_READ_ONLY \
-    ERROR_CLASS_GENERIC_ERROR, "Device '%s' is read only"
-
 #define QERR_DEVICE_NO_HOTPLUG \
     ERROR_CLASS_GENERIC_ERROR, "Device '%s' does not support hotplugging"