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throttle: Remove throttle_group_lock/unlock() 

The group throttling code was always meant to handle its locking
internally. However, bdrv_swap() was touching the ThrottleGroup
structure directly and therefore needed an API for that.

Now that bdrv_swap() no longer exists there's no need for the
throttle_group_lock() API anymore.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2015-10-21 21:36:05 +03:00 committed by Kevin Wolf
parent bd745e238b
commit d87d01e16a
2 changed files with 1 additions and 33 deletions
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31
block/throttle-groups.c
View File

@ -33,8 +33,7 @@
* its own locking.
*
* This locking is however handled internally in this file, so it's
* mostly transparent to outside users (but see the documentation in
* throttle_groups_lock()).
* transparent to outside users.
*
* The whole ThrottleGroup structure is private and invisible to
* outside users, that only use it through its ThrottleState.
@ -468,34 +467,6 @@ void throttle_group_unregister_bs(BlockDriverState *bs)
bs->throttle_state = NULL;
}
/* Acquire the lock of this throttling group.
*
* You won't normally need to use this. None of the functions from the
* ThrottleGroup API require you to acquire the lock since all of them
* deal with it internally.
*
* This should only be used in exceptional cases when you want to
* access the protected fields of a BlockDriverState directly
* (e.g. bdrv_swap()).
*
* @bs: a BlockDriverState that is member of the group
*/
void throttle_group_lock(BlockDriverState *bs)
{
ThrottleGroup *tg = container_of(bs->throttle_state, ThrottleGroup, ts);
qemu_mutex_lock(&tg->lock);
}
/* Release the lock of this throttling group.
*
* See the comments in throttle_group_lock().
*/
void throttle_group_unlock(BlockDriverState *bs)
{
ThrottleGroup *tg = container_of(bs->throttle_state, ThrottleGroup, ts);
qemu_mutex_unlock(&tg->lock);
}
static void throttle_groups_init(void)
{
qemu_mutex_init(&throttle_groups_lock);

3
include/block/throttle-groups.h
View File

@ -43,7 +43,4 @@ void coroutine_fn throttle_group_co_io_limits_intercept(BlockDriverState *bs,
unsigned int bytes,
bool is_write);
void throttle_group_lock(BlockDriverState *bs);
void throttle_group_unlock(BlockDriverState *bs);
#endif