This patch adds function bdrv_query_image_info(), which will
retrieve image info in qmp object format. The implementation is
based on the code moved from qemu-img.c, but uses block layer
function to get snapshot info.
Signed-off-by: Wenchao Xia <xiaw...@linux.vnet.ibm.com>
---
block/qapi.c | 43 +++++++++++++++++++++++++++++++++++++------
include/block/qapi.h | 6 +++---
qemu-img.c | 11 ++++++-----
3 files changed, 46 insertions(+), 14 deletions(-)
diff --git a/block/qapi.c b/block/qapi.c
index 1ed56da..e9d8b74 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -88,18 +88,29 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs,
return 0;
}
-void bdrv_collect_image_info(BlockDriverState *bs,
- ImageInfo *info,
- const char *filename)
+/**
+ * bdrv_query_image_info:
+ * @bs: block device to examine
+ * @p_info: location to store image information
+ * @errp: location to store error information
+ *
+ * @p_info will be set only on success. On error, store error in @errp.
+ */
+void bdrv_query_image_info(BlockDriverState *bs,
+ ImageInfo **p_info,
+ Error **errp)
{
uint64_t total_sectors;
- char backing_filename[1024];
+ const char *backing_filename;
char backing_filename2[1024];
BlockDriverInfo bdi;
+ int ret;
+ Error *err = NULL;
+ ImageInfo *info = g_new0(ImageInfo, 1);
bdrv_get_geometry(bs, &total_sectors);
- info->filename = g_strdup(filename);
+ info->filename = g_strdup(bs->filename);
info->format = g_strdup(bdrv_get_format_name(bs));
info->virtual_size = total_sectors * 512;
info->actual_size = bdrv_get_allocated_file_size(bs);
@@ -116,7 +127,7 @@ void bdrv_collect_image_info(BlockDriverState *bs,
info->dirty_flag = bdi.is_dirty;
info->has_dirty_flag = true;
}
- bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
+ backing_filename = bs->backing_file;
if (backing_filename[0] != '\0') {
info->backing_filename = g_strdup(backing_filename);
info->has_backing_filename = true;
@@ -134,6 +145,26 @@ void bdrv_collect_image_info(BlockDriverState *bs,
info->has_backing_filename_format = true;
}
}
+
+ ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err);
+ switch (ret) {
+ case 0:
+ if (info->snapshots) {
+ info->has_snapshots = true;
+ }
+ break;
+ /* recoverable error */
+ case -ENOMEDIUM:
+ case -ENOTSUP:
+ error_free(err);
+ break;
+ default:
+ error_propagate(errp, err);
+ qapi_free_ImageInfo(info);
+ return;
+ }
+
+ *p_info = info;
}
BlockInfo *bdrv_query_info(BlockDriverState *bs)
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 4f223d1..ab1f48f 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -32,9 +32,9 @@
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);
+void bdrv_query_image_info(BlockDriverState *bs,
+ ImageInfo **p_info,
+ Error **errp);
BlockInfo *bdrv_query_info(BlockDriverState *s);
BlockStats *bdrv_query_stats(const BlockDriverState *bs);
diff --git a/qemu-img.c b/qemu-img.c
index 29929c5..04a3f7c 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1642,6 +1642,7 @@ static ImageInfoList *collect_image_info_list(const char
*filename,
ImageInfoList *head = NULL;
ImageInfoList **last = &head;
GHashTable *filenames;
+ Error *err = NULL;
filenames = g_hash_table_new_full(g_str_hash, str_equal_func, NULL, NULL);
@@ -1663,11 +1664,11 @@ static ImageInfoList *collect_image_info_list(const
char *filename,
goto err;
}
- info = g_new0(ImageInfo, 1);
- bdrv_collect_image_info(bs, info, filename);
- bdrv_query_snapshot_info_list(bs, &info->snapshots, NULL);
- if (info->snapshots) {
- info->has_snapshots = true;
+ bdrv_query_image_info(bs, &info, &err);
+ if (error_is_set(&err)) {
+ error_report("%s", error_get_pretty(err));
+ error_free(err);
+ goto err;
}
elem = g_new0(ImageInfoList, 1);
--
1.7.1
