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block: Make BlockBackend own its BlockDriverState

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On BlockBackend destruction, unref its BlockDriverState.  Replaces the
callers' unrefs.

This turns the pointer from BlockBackend to BlockDriverState into a
strong reference, managed with bdrv_ref() / bdrv_unref().  The
back-pointer remains weak.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2014-10-07 13:59:08 +02:00 • committed by Kevin Wolf
parent 8fb3c76c94
commit 9ba10c95a4
6 changed files with 7 additions and 53 deletions
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6
block/block-backend.c
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@ -54,8 +54,6 @@ BlockBackend *blk_new(const char *name, Error **errp)
/*
* Create a new BlockBackend with a new BlockDriverState attached.
* Both have a reference count of one. Caller owns *both* references.
* TODO Let caller own only the BlockBackend reference
* Otherwise just like blk_new(), which see.
*/
BlockBackend *blk_new_with_bs(const char *name, Error **errp)
@ -83,7 +81,9 @@ static void blk_delete(BlockBackend *blk)
{
assert(!blk->refcnt);
if (blk->bs) {
assert(blk->bs->blk == blk);
blk->bs->blk = NULL;
bdrv_unref(blk->bs);
blk->bs = NULL;
}
/* Avoid double-remove after blk_hide_on_behalf_of_do_drive_del() */
@ -119,8 +119,6 @@ void blk_ref(BlockBackend *blk)
* Decrement @blk's reference count.
* If this drops it to zero, destroy @blk.
* For convenience, do nothing if @blk is null.
* Does *not* touch the attached BlockDriverState's reference count.
* TODO Decrement it!
*/
void blk_unref(BlockBackend *blk)
{