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block: throttle-groups: Use BlockBackend pointers internally

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As a first step towards moving I/O throttling to the BlockBackend level,
this patch changes all pointers in struct ThrottleGroup from referencing
a BlockDriverState to referencing a BlockBackend.

This change is valid because we made sure that throttling can only be
enabled on BDSes which have a BB attached.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-21 11:30:57 +01:00
parent f2cd875d54
commit 31dce3ccca
6 changed files with 83 additions and 78 deletions
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4
block/io.c
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@ -70,7 +70,7 @@ void bdrv_io_limits_disable(BlockDriverState *bs)
{
assert(bs->throttle_state);
bdrv_no_throttling_begin(bs);
throttle_group_unregister_bs(bs);
throttle_group_unregister_blk(bs->blk);
bdrv_no_throttling_end(bs);
}
@ -78,7 +78,7 @@ void bdrv_io_limits_disable(BlockDriverState *bs)
void bdrv_io_limits_enable(BlockDriverState *bs, const char *group)
{
assert(!bs->throttle_state);
throttle_group_register_bs(bs, group);
throttle_group_register_blk(bs->blk, group);
}
void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group)