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block: add image info query function bdrv_query_image_info()

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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 <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Wenchao Xia 2013-06-06 12:27:58 +08:00 committed by Stefan Hajnoczi
parent fb0ed4539c
commit 43526ec8d1
3 changed files with 46 additions and 14 deletions
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43
block/qapi.c
View file

@ -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)

6
include/block/qapi.h
View file

@ -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);

11
qemu-img.c
View file

@ -1644,6 +1644,7 @@ 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);
@ -1665,11 +1666,11 @@ 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);