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block: Convert bs->backing_hd to BdrvChild

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This is the final step in converting all of the BlockDriverState
pointers that block drivers use to BdrvChild.

After this patch, bs->children contains the full list of child nodes
that are referenced by a given BDS, and these children are only
referenced through BdrvChild, so that updating the pointer in there is
enough for changing edges in the graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2015-06-17 14:55:21 +02:00
parent b26e90f56a
commit 760e006384
14 changed files with 115 additions and 109 deletions
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12
include/block/block_int.h
View file

@ -378,8 +378,7 @@ struct BlockDriverState {
QDict *full_open_options;
char exact_filename[PATH_MAX];
BlockDriverState *backing_hd;
BdrvChild *backing_child;
BdrvChild *backing;
BdrvChild *file;
NotifierList close_notifiers;
@ -458,6 +457,11 @@ struct BlockDriverState {
NotifierWithReturn write_threshold_notifier;
};
static inline BlockDriverState *backing_bs(BlockDriverState *bs)
{
return bs->backing ? bs->backing->bs : NULL;
}
/* Essential block drivers which must always be statically linked into qemu, and
* which therefore can be accessed without using bdrv_find_format() */
@ -496,7 +500,7 @@ void bdrv_add_before_write_notifier(BlockDriverState *bs,
*
* May be called from .bdrv_detach_aio_context() to detach children from the
* current #AioContext. This is only needed by block drivers that manage their
* own children. Both ->file and ->backing_hd are automatically handled and
* own children. Both ->file and ->backing are automatically handled and
* block drivers should not call this function on them explicitly.
*/
void bdrv_detach_aio_context(BlockDriverState *bs);
@ -506,7 +510,7 @@ void bdrv_detach_aio_context(BlockDriverState *bs);
*
* May be called from .bdrv_attach_aio_context() to attach children to the new
* #AioContext. This is only needed by block drivers that manage their own
* children. Both ->file and ->backing_hd are automatically handled and block
* children. Both ->file and ->backing are automatically handled and block
* drivers should not call this function on them explicitly.
*/
void bdrv_attach_aio_context(BlockDriverState *bs,