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block: Use child access functions for QAPI queries 

query-block, query-named-block-nodes, and query-blockstats now return
any filtered child under "backing", not just bs->backing or COW
children.  This is so that filters do not interrupt the reported backing
chain.  This changes the output for iotest 184, as the throttled node
now appears as a backing child.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 18:23:25 +02:00 committed by Kevin Wolf
parent 3f26191c73
commit 0a7585dbba
2 changed files with 27 additions and 14 deletions
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33
block/qapi.c
View File

@ -163,9 +163,13 @@ BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
break;
}
if (bs0->drv && bs0->backing) {
if (bs0->drv && bdrv_filter_or_cow_child(bs0)) {
/*
* Put any filtered child here (for backwards compatibility to when
* we put bs0->backing here, which might be any filtered child).
*/
info->backing_file_depth++;
bs0 = bs0->backing->bs;
bs0 = bdrv_filter_or_cow_bs(bs0);
(*p_image_info)->has_backing_image = true;
p_image_info = &((*p_image_info)->backing_image);
} else {
@ -174,9 +178,8 @@ BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
/* Skip automatically inserted nodes that the user isn't aware of for
* query-block (blk != NULL), but not for query-named-block-nodes */
while (blk && bs0->drv && bs0->implicit) {
bs0 = backing_bs(bs0);
assert(bs0);
if (blk) {
bs0 = bdrv_skip_implicit_filters(bs0);
}
}
@ -362,9 +365,7 @@ static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info,
char *qdev;
/* Skip automatically inserted nodes that the user isn't aware of */
while (bs && bs->drv && bs->implicit) {
bs = backing_bs(bs);
}
bs = bdrv_skip_implicit_filters(bs);
info->device = g_strdup(blk_name(blk));
info->type = g_strdup("unknown");
@ -527,6 +528,7 @@ static BlockStats *bdrv_query_bds_stats(BlockDriverState *bs,
bool blk_level)
{
BdrvChild *parent_child;
BlockDriverState *filter_or_cow_bs;
BlockStats *s = NULL;
s = g_malloc0(sizeof(*s));
@ -539,9 +541,8 @@ static BlockStats *bdrv_query_bds_stats(BlockDriverState *bs,
/* Skip automatically inserted nodes that the user isn't aware of in
* a BlockBackend-level command. Stay at the exact node for a node-level
* command. */
while (blk_level && bs->drv && bs->implicit) {
bs = backing_bs(bs);
assert(bs);
if (blk_level) {
bs = bdrv_skip_implicit_filters(bs);
}
if (bdrv_get_node_name(bs)[0]) {
@ -587,9 +588,15 @@ static BlockStats *bdrv_query_bds_stats(BlockDriverState *bs,
s->parent = bdrv_query_bds_stats(parent_child->bs, blk_level);
}
if (blk_level && bs->backing) {
filter_or_cow_bs = bdrv_filter_or_cow_bs(bs);
if (blk_level && filter_or_cow_bs) {
/*
* Put any filtered or COW child here (for backwards
* compatibility to when we put bs0->backing here, which might
* be either)
*/
s->has_backing = true;
s->backing = bdrv_query_bds_stats(bs->backing->bs, blk_level);
s->backing = bdrv_query_bds_stats(filter_or_cow_bs, blk_level);
}
return s;

8
tests/qemu-iotests/184.out
View File

@ -27,6 +27,12 @@ Testing:
"iops_rd": 0,
"detect_zeroes": "off",
"image": {
"backing-image": {
"virtual-size": 1073741824,
"filename": "null-co://",
"format": "null-co",
"actual-size": 0
},
"virtual-size": 1073741824,
"filename": "json:{\"throttle-group\": \"group0\", \"driver\": \"throttle\", \"file\": {\"driver\": \"null-co\"}}",
"format": "throttle",
@ -35,7 +41,7 @@ Testing:
"iops_wr": 0,
"ro": false,
"node-name": "throttle0",
"backing_file_depth": 0,
"backing_file_depth": 1,
"drv": "throttle",
"iops": 0,
"bps_wr": 0,