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block: refactor put_iocontext_active

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Factor out a ioc_exit_icqs helper to tear down the icqs and the fold
the rest of put_iocontext_active into exit_io_context.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211209063131.18537-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-12-09 07:31:23 +01:00 committed by Jens Axboe
parent 0aed2f162b
commit 4be8a2eaff
1 changed files with 14 additions and 27 deletions
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41
block/blk-ioc.c
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@ -54,6 +54,16 @@ static void ioc_exit_icq(struct io_cq *icq)
icq->flags |= ICQ_EXITED;
}
static void ioc_exit_icqs(struct io_context *ioc)
{
struct io_cq *icq;
spin_lock_irq(&ioc->lock);
hlist_for_each_entry(icq, &ioc->icq_list, ioc_node)
ioc_exit_icq(icq);
spin_unlock_irq(&ioc->lock);
}
/*
* Release an icq. Called with ioc locked for blk-mq, and with both ioc
* and queue locked for legacy.
@ -169,32 +179,6 @@ void put_io_context(struct io_context *ioc)
}
EXPORT_SYMBOL_GPL(put_io_context);
/**
* put_io_context_active - put active reference on ioc
* @ioc: ioc of interest
*
* Put an active reference to an ioc. If active reference reaches zero after
* put, @ioc can never issue further IOs and ioscheds are notified.
*/
static void put_io_context_active(struct io_context *ioc)
{
struct io_cq *icq;
if (!atomic_dec_and_test(&ioc->active_ref))
return;
spin_lock_irq(&ioc->lock);
hlist_for_each_entry(icq, &ioc->icq_list, ioc_node) {
if (icq->flags & ICQ_EXITED)
continue;
ioc_exit_icq(icq);
}
spin_unlock_irq(&ioc->lock);
put_io_context(ioc);
}
/* Called by the exiting task */
void exit_io_context(struct task_struct *task)
{
@ -205,7 +189,10 @@ void exit_io_context(struct task_struct *task)
task->io_context = NULL;
task_unlock(task);
put_io_context_active(ioc);
if (atomic_dec_and_test(&ioc->active_ref)) {
ioc_exit_icqs(ioc);
put_io_context(ioc);
}
}
static void __ioc_clear_queue(struct list_head *icq_list)