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block: Convert bdrv_co_preadv/pwritev to BdrvChild

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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 <kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-06-20 21:31:46 +02:00
parent e293b7a3df
commit a03ef88f77
12 changed files with 38 additions and 37 deletions
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4
include/block/block_int.h
View file

@ -563,10 +563,10 @@ extern BlockDriver bdrv_qcow2;
*/
void bdrv_setup_io_funcs(BlockDriver *bdrv);
int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
int coroutine_fn bdrv_co_preadv(BdrvChild *child,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags);
int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags);