Commit d1932dc3 authored by Jens Axboe's avatar Jens Axboe

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
...@@ -533,6 +533,27 @@ static inline int wake_page_match(struct wait_page_queue *wait_page, ...@@ -533,6 +533,27 @@ static inline int wake_page_match(struct wait_page_queue *wait_page,
return 1; 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 void __lock_page(struct page *page);
extern int __lock_page_killable(struct page *page); extern int __lock_page_killable(struct page *page);
extern int __lock_page_async(struct page *page, struct wait_page_queue *wait); extern int __lock_page_async(struct page *page, struct wait_page_queue *wait);
......
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