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block: refactor put_io_context

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Move the code to delay freeing the icqs into a separate helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211209063131.18537-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-12-09 07:31:25 +01:00 committed by Jens Axboe
parent 8a20c0c7e0
commit edf70ff5a1
1 changed files with 19 additions and 19 deletions
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38
block/blk-ioc.c
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@ -143,6 +143,24 @@ static void ioc_release_fn(struct work_struct *work)
kmem_cache_free(iocontext_cachep, ioc);
}
/*
* Releasing icqs requires reverse order double locking and we may already be
* holding a queue_lock. Do it asynchronously from a workqueue.
*/
static bool ioc_delay_free(struct io_context *ioc)
{
unsigned long flags;
spin_lock_irqsave(&ioc->lock, flags);
if (!hlist_empty(&ioc->icq_list)) {
queue_work(system_power_efficient_wq, &ioc->release_work);
spin_unlock_irqrestore(&ioc->lock, flags);
return true;
}
spin_unlock_irqrestore(&ioc->lock, flags);
return false;
}
/**
* put_io_context - put a reference of io_context
* @ioc: io_context to put
@ -152,26 +170,8 @@ static void ioc_release_fn(struct work_struct *work)
*/
void put_io_context(struct io_context *ioc)
{
unsigned long flags;
bool free_ioc = false;
BUG_ON(atomic_long_read(&ioc->refcount) <= 0);
/*
* Releasing ioc requires reverse order double locking and we may
* already be holding a queue_lock. Do it asynchronously from wq.
*/
if (atomic_long_dec_and_test(&ioc->refcount)) {
spin_lock_irqsave(&ioc->lock, flags);
if (!hlist_empty(&ioc->icq_list))
queue_work(system_power_efficient_wq,
&ioc->release_work);
else
free_ioc = true;
spin_unlock_irqrestore(&ioc->lock, flags);
}
if (free_ioc)
if (atomic_long_dec_and_test(&ioc->refcount) && !ioc_delay_free(ioc))
kmem_cache_free(iocontext_cachep, ioc);
}
EXPORT_SYMBOL_GPL(put_io_context);