diff mbox

[V10,05/17] block: add snapshot info query function bdrv_query_snapshot_info_list()

Message ID 1363961953-13561-6-git-send-email-xiawenc@linux.vnet.ibm.com
State New
Headers show

Commit Message

Wayne Xia March 22, 2013, 2:19 p.m. UTC 
This patch adds function bdrv_query_snapshot_info_list(), which will
retrieve snapshot info of an image in qmp object format. The implementation
is based on the code moved from qemu-img.c with modification to fit more
for qmp based block layer API.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 block/qapi.c         |   52 +++++++++++++++++++++++++++++++++++++------------
 include/block/qapi.h |    4 ++-
 qemu-img.c           |    4 ++-
 3 files changed, 45 insertions(+), 15 deletions(-)

Comments

Eric Blake March 27, 2013, 9:31 p.m. UTC | #1 
On 03/22/2013 08:19 AM, Wenchao Xia wrote:
>   This patch adds function bdrv_query_snapshot_info_list(), which will
> retrieve snapshot info of an image in qmp object format. The implementation
> is based on the code moved from qemu-img.c with modification to fit more
> for qmp based block layer API.
> 
> Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> ---
>  block/qapi.c         |   52 +++++++++++++++++++++++++++++++++++++------------
>  include/block/qapi.h |    4 ++-
>  qemu-img.c           |    4 ++-
>  3 files changed, 45 insertions(+), 15 deletions(-)

> +        default:
> +            error_setg(errp, "Can't list snapshots of device '%s': %s",
> +                       dev, strerror(-sn_count));

This works (hence I didn't notice it before), but you might want to use:

error_setg_errno(errp, -sn_count,
                 "Can't list snapshots of device '%s'", dev);

Either way, you can keep my

Reviewed-by: Eric Blake <eblake@redhat.com>
diff mbox

Patch

diff --git a/block/qapi.c b/block/qapi.c
index e2b1b6b..119f1f9 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -25,29 +25,53 @@ 
 #include "block/qapi.h"
 #include "block/block_int.h"
 
-void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info)
+/* return 0 on success, and @p_list will be set only on success. */
+int bdrv_query_snapshot_info_list(BlockDriverState *bs,
+                                  SnapshotInfoList **p_list,
+                                  Error **errp)
 {
     int i, sn_count;
     QEMUSnapshotInfo *sn_tab = NULL;
-    SnapshotInfoList *info_list, *cur_item = NULL;
+    SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL;
+    SnapshotInfo *info;
+
     sn_count = bdrv_snapshot_list(bs, &sn_tab);
+    if (sn_count < 0) {
+        const char *dev = bdrv_get_device_name(bs);
+        switch (sn_count) {
+        case -ENOMEDIUM:
+            error_setg(errp, "Device '%s' is not inserted", dev);
+            break;
+        case -ENOTSUP:
+            error_setg(errp,
+                       "Device '%s' does not support internal snapshots",
+                       dev);
+            break;
+        default:
+            error_setg(errp, "Can't list snapshots of device '%s': %s",
+                       dev, strerror(-sn_count));
+            break;
+        }
+        return sn_count;
+    }
 
     for (i = 0; i < sn_count; i++) {
-        info->has_snapshots = true;
-        info_list = g_new0(SnapshotInfoList, 1);
 
-        info_list->value                = g_new0(SnapshotInfo, 1);
-        info_list->value->id            = g_strdup(sn_tab[i].id_str);
-        info_list->value->name          = g_strdup(sn_tab[i].name);
-        info_list->value->vm_state_size = sn_tab[i].vm_state_size;
-        info_list->value->date_sec      = sn_tab[i].date_sec;
-        info_list->value->date_nsec     = sn_tab[i].date_nsec;
-        info_list->value->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
-        info_list->value->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
+        info = g_new0(SnapshotInfo, 1);
+        info->id            = g_strdup(sn_tab[i].id_str);
+        info->name          = g_strdup(sn_tab[i].name);
+        info->vm_state_size = sn_tab[i].vm_state_size;
+        info->date_sec      = sn_tab[i].date_sec;
+        info->date_nsec     = sn_tab[i].date_nsec;
+        info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
+        info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
+
+        info_list = g_new0(SnapshotInfoList, 1);
+        info_list->value = info;
 
         /* XXX: waiting for the qapi to support qemu-queue.h types */
         if (!cur_item) {
-            info->snapshots = cur_item = info_list;
+            head = cur_item = info_list;
         } else {
             cur_item->next = info_list;
             cur_item = info_list;
@@ -56,6 +80,8 @@  void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info)
     }
 
     g_free(sn_tab);
+    *p_list = head;
+    return 0;
 }
 
 void bdrv_collect_image_info(BlockDriverState *bs,
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 4586578..91dc41b 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -28,7 +28,9 @@ 
 #include "qapi-types.h"
 #include "block/block.h"
 
-void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info);
+int bdrv_query_snapshot_info_list(BlockDriverState *bs,
+                                  SnapshotInfoList **p_list,
+                                  Error **errp);
 void bdrv_collect_image_info(BlockDriverState *bs,
                              ImageInfo *info,
                              const char *filename);
diff --git a/qemu-img.c b/qemu-img.c
index a020ccc..9fb33e1 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1735,7 +1735,9 @@  static ImageInfoList *collect_image_info_list(const char *filename,
 
         info = g_new0(ImageInfo, 1);
         bdrv_collect_image_info(bs, info, filename);
-        bdrv_collect_snapshots(bs, info);
+        if (!bdrv_query_snapshot_info_list(bs, &info->snapshots, NULL)) {
+            info->has_snapshots = true;
+        }
 
         elem = g_new0(ImageInfoList, 1);
         elem->value = info;