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From: Jens Axboe <[email protected]>
To: [email protected]
Cc: [email protected], [email protected],
	[email protected], Jens Axboe <[email protected]>
Subject: [PATCH 10/11] mm: add kiocb_wait_page_async_init() helper
Date: Fri, 22 May 2020 19:50:48 -0600	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

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 <[email protected]>
---
 include/linux/pagemap.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

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);
-- 
2.26.2


  parent reply	other threads:[~2020-05-23  1:51 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-23  1:50 [PATCHSET v2 RFC 0/11] Add support for async buffered reads Jens Axboe
2020-05-23  1:50 ` [PATCH 01/11] block: read-ahead submission should imply no-wait as well Jens Axboe
2020-05-23  1:50 ` [PATCH 02/11] mm: allow read-ahead with IOCB_NOWAIT set Jens Axboe
2020-05-23  1:50 ` [PATCH 03/11] mm: add support for async page locking Jens Axboe
2020-05-23  1:50 ` [PATCH 04/11] mm: support async buffered reads in generic_file_buffered_read() Jens Axboe
2020-05-23  1:50 ` [PATCH 05/11] fs: add FMODE_BUF_RASYNC Jens Axboe
2020-05-23  1:50 ` [PATCH 06/11] ext4: flag as supporting buffered async reads Jens Axboe
2020-05-23  1:50 ` [PATCH 07/11] block: flag block devices as supporting IOCB_WAITQ Jens Axboe
2020-05-23  1:50 ` [PATCH 08/11] xfs: flag files as supporting buffered async reads Jens Axboe
2020-05-23  1:50 ` [PATCH 09/11] btrfs: " Jens Axboe
2020-05-23  1:50 ` Jens Axboe [this message]
2020-05-23  1:50 ` [PATCH 11/11] io_uring: support true async buffered reads, if file provides it Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2020-05-22 20:23 [PATCHSET RFC 0/11] Add support for async buffered reads Jens Axboe
2020-05-22 20:23 ` [PATCH 10/11] mm: add kiocb_wait_page_async_init() helper Jens Axboe

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