From d5a8ee60a0fbc20a2c2d02f3bda1bb1bd365f1ee Mon Sep 17 00:00:00 2001 From: Alberto Garcia Date: Fri, 17 Apr 2015 14:52:43 +0300 Subject: [PATCH] qmp: fill in the image field in BlockDeviceInfo The image field in BlockDeviceInfo is supposed to contain an ImageInfo object. However that is being filled in by bdrv_query_info(), not by bdrv_block_device_info(), which is where BlockDeviceInfo is actually created. Anyone calling bdrv_block_device_info() directly will get a null image field. As a consequence of this, the HMP command 'info block -n -v' crashes QEMU. This patch moves the code that fills in that field from bdrv_query_info() to bdrv_block_device_info(). Signed-off-by: Alberto Garcia Message-id: 1429271563-3765-1-git-send-email-berto@igalia.com Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 9 +++++++-- block/qapi.c | 46 +++++++++++++++++++++++-------------------- blockdev.c | 2 +- include/block/block.h | 2 +- include/block/qapi.h | 2 +- 5 files changed, 35 insertions(+), 26 deletions(-) diff --git a/block.c b/block.c index 002972ad17..101b50c6c2 100644 --- a/block.c +++ b/block.c @@ -3897,15 +3897,20 @@ BlockDriverState *bdrv_find_node(const char *node_name) } /* Put this QMP function here so it can access the static graph_bdrv_states. */ -BlockDeviceInfoList *bdrv_named_nodes_list(void) +BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) { BlockDeviceInfoList *list, *entry; BlockDriverState *bs; list = NULL; QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { + BlockDeviceInfo *info = bdrv_block_device_info(bs, errp); + if (!info) { + qapi_free_BlockDeviceInfoList(list); + return NULL; + } entry = g_malloc0(sizeof(*entry)); - entry->value = bdrv_block_device_info(bs); + entry->value = info; entry->next = list; list = entry; } diff --git a/block/qapi.c b/block/qapi.c index 8a19aed446..063dd1bc1f 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -31,8 +31,10 @@ #include "qapi/qmp/types.h" #include "sysemu/block-backend.h" -BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs) +BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs, Error **errp) { + ImageInfo **p_image_info; + BlockDriverState *bs0; BlockDeviceInfo *info = g_malloc0(sizeof(*info)); info->file = g_strdup(bs->filename); @@ -92,6 +94,25 @@ BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs) info->write_threshold = bdrv_write_threshold_get(bs); + bs0 = bs; + p_image_info = &info->image; + while (1) { + Error *local_err = NULL; + bdrv_query_image_info(bs0, p_image_info, &local_err); + if (local_err) { + error_propagate(errp, local_err); + qapi_free_BlockDeviceInfo(info); + return NULL; + } + if (bs0->drv && bs0->backing_hd) { + bs0 = bs0->backing_hd; + (*p_image_info)->has_backing_image = true; + p_image_info = &((*p_image_info)->backing_image); + } else { + break; + } + } + return info; } @@ -264,9 +285,6 @@ static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info, { BlockInfo *info = g_malloc0(sizeof(*info)); BlockDriverState *bs = blk_bs(blk); - BlockDriverState *bs0; - ImageInfo **p_image_info; - Error *local_err = NULL; info->device = g_strdup(blk_name(blk)); info->type = g_strdup("unknown"); info->locked = blk_dev_is_medium_locked(blk); @@ -289,23 +307,9 @@ static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info, if (bs->drv) { info->has_inserted = true; - info->inserted = bdrv_block_device_info(bs); - - bs0 = bs; - p_image_info = &info->inserted->image; - while (1) { - bdrv_query_image_info(bs0, p_image_info, &local_err); - if (local_err) { - error_propagate(errp, local_err); - goto err; - } - if (bs0->drv && bs0->backing_hd) { - bs0 = bs0->backing_hd; - (*p_image_info)->has_backing_image = true; - p_image_info = &((*p_image_info)->backing_image); - } else { - break; - } + info->inserted = bdrv_block_device_info(bs, errp); + if (info->inserted == NULL) { + goto err; } } diff --git a/blockdev.c b/blockdev.c index e67c701879..a136b2ed47 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2392,7 +2392,7 @@ out: BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) { - return bdrv_named_nodes_list(); + return bdrv_named_nodes_list(errp); } void qmp_blockdev_backup(const char *device, const char *target, diff --git a/include/block/block.h b/include/block/block.h index b285e0d659..d79714a85d 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -382,7 +382,7 @@ void bdrv_lock_medium(BlockDriverState *bs, bool locked); void bdrv_eject(BlockDriverState *bs, bool eject_flag); const char *bdrv_get_format_name(BlockDriverState *bs); BlockDriverState *bdrv_find_node(const char *node_name); -BlockDeviceInfoList *bdrv_named_nodes_list(void); +BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); BlockDriverState *bdrv_lookup_bs(const char *device, const char *node_name, Error **errp); diff --git a/include/block/qapi.h b/include/block/qapi.h index 168d788521..327549d917 100644 --- a/include/block/qapi.h +++ b/include/block/qapi.h @@ -29,7 +29,7 @@ #include "block/block.h" #include "block/snapshot.h" -BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs); +BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs, Error **errp); int bdrv_query_snapshot_info_list(BlockDriverState *bs, SnapshotInfoList **p_list, Error **errp); -- 2.34.1