From: Kevin Wolf Date: Mon, 20 Jun 2016 19:31:46 +0000 (+0200) Subject: block: Convert bdrv_co_preadv/pwritev to BdrvChild X-Git-Url: https://repo.jachan.dev/qemu.git/commitdiff_plain/a03ef88f77af045a2eb9629b5ce774a3fb973c5e?hp=a03ef88f77af045a2eb9629b5ce774a3fb973c5e block: Convert bdrv_co_preadv/pwritev to BdrvChild This is the final patch for converting the common I/O path to take a BdrvChild parameter instead of BlockDriverState. The completion of this conversion means that all users that perform I/O on an image need to actually hold a reference (in the form of BdrvChild, possible as part of a BlockBackend) to that image. This also protects against inconsistent use of BlockBackend vs. BlockDriverState functions because direct use of a BlockDriverState isn't possible any more and blk->root is private for block-backends.c. In addition, we can now distinguish different users in the I/O path, and the future op blockers work is going to add assertions based on permissions stored in BdrvChild. Signed-off-by: Kevin Wolf Acked-by: Stefan Hajnoczi ---