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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: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-05-22 10:18:23 -06:00
parent 8730f12b79
commit d1932dc3dc
1 changed files with 21 additions and 0 deletions
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21
include/linux/pagemap.h
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@ -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);