Commit d1932dc3 authored by Jens Axboe's avatar Jens Axboe
Browse files

mm: add kiocb_wait_page_queue_init() helper 



Checks if the file supports it, and initializes the values that we need.
Caller passes in 'data' pointer, if any, and the callback function to
be used.

Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 8730f12b

include/linux/pagemap.h

+21 −0
Original line number Diff line number Diff line
@@ -533,6 +533,27 @@ static inline int wake_page_match(struct wait_page_queue *wait_page, 
	return 1;

}



static inline int kiocb_wait_page_queue_init(struct kiocb *kiocb,

					     struct wait_page_queue *wait,

					     wait_queue_func_t func,

					     void *data)

{

	/* Can't support async wakeup with polled IO */

	if (kiocb->ki_flags & IOCB_HIPRI)

		return -EINVAL;

	if (kiocb->ki_filp->f_mode & FMODE_BUF_RASYNC) {

		wait->wait.func = func;

		wait->wait.private = data;

		wait->wait.flags = 0;

		INIT_LIST_HEAD(&wait->wait.entry);

		kiocb->ki_flags |= IOCB_WAITQ;

		kiocb->ki_waitq = wait;

		return 0;

	}



	return -EOPNOTSUPP;

}



extern void __lock_page(struct page *page);

extern int __lock_page_killable(struct page *page);

extern int __lock_page_async(struct page *page, struct wait_page_queue *wait);

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