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block: Add blk_get_refcnt()

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This function returns the reference count of a given BlockBackend.
For convenience, it returns 0 if the BlockBackend pointer is NULL.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: dfdd8a17dbe3288842840636d2cfe5bb895abcb0.1446475331.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2015-11-02 16:51:54 +02:00 • committed by Max Reitz
parent 10f3cd15dd
commit f636ae85f3
2 changed files with 6 additions and 0 deletions
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5
block/block-backend.c
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@ -189,6 +189,11 @@ static void drive_info_del(DriveInfo *dinfo)
g_free(dinfo);
}
int blk_get_refcnt(BlockBackend *blk)
{
return blk ? blk->refcnt : 0;
}
/*
* Increment @blk's reference count.
* @blk must not be null.