diff mbox series

[10/11] mm: add kiocb_wait_page_async_init() helper

Message ID 20200523015049.14808-11-axboe@kernel.dk (mailing list archive)
State New, archived
Headers show
Series Add support for async buffered reads | expand

Commit Message

Jens Axboe May 23, 2020, 1:50 a.m. UTC 
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.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 include/linux/pagemap.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e260bcd071e4..21ced353310a 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -468,6 +468,24 @@  struct wait_page_async {
 	struct wait_page_key key;
 };
 
+static inline int kiocb_wait_page_async_init(struct kiocb *kiocb,
+					     struct wait_page_async *wait,
+					     wait_queue_func_t func,
+					     void *data)
+{
+	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->private = 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_async *wait);