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block: Mark bdrv_(un)freeze_backing_chain() and callers GRAPH_RDLOCK

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This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_(un)freeze_backing_chain() need to hold a reader lock for the
graph because it calls bdrv_filter_or_cow_child(), which accesses
bs->file/backing.

Use the opportunity to make bdrv_is_backing_chain_frozen() static, it
has no external callers.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-10-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-10-27 17:53:18 +02:00
parent ad74751fc0
commit 9275fc72bd
7 changed files with 46 additions and 17 deletions
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5
block.c
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@ -5843,8 +5843,9 @@ BlockDriverState *bdrv_find_base(BlockDriverState *bs)
* between @bs and @base is frozen. @errp is set if that's the case.
* @base must be reachable from @bs, or NULL.
*/
bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base,
Error **errp)
static bool GRAPH_RDLOCK
bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base,
Error **errp)
{
BlockDriverState *i;
BdrvChild *child;