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From: Stefan Roesch <shr@fb.com>
To: <io-uring@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
	<linux-block@vger.kernel.org>, <kernel-team@fb.com>
Cc: <shr@fb.com>
Subject: [PATCH v2 13/13] block: enable async buffered writes for block devices.
Date: Fri, 18 Feb 2022 11:57:39 -0800	[thread overview]
Message-ID: <20220218195739.585044-14-shr@fb.com> (raw)
In-Reply-To: <20220218195739.585044-1-shr@fb.com>

This introduces the flag FMODE_BUF_WASYNC. If devices support async
buffered writes, this flag can be set. It also enables async buffered
writes for block devices.

Signed-off-by: Stefan Roesch <shr@fb.com>
---
 block/fops.c       | 5 +----
 fs/read_write.c    | 3 ++-
 include/linux/fs.h | 3 +++
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/block/fops.c b/block/fops.c
index 4f59e0f5bf30..75b36f8b5e71 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -489,7 +489,7 @@ static int blkdev_open(struct inode *inode, struct file *filp)
 	 * during an unstable branch.
 	 */
 	filp->f_flags |= O_LARGEFILE;
-	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
+	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC;
 
 	if (filp->f_flags & O_NDELAY)
 		filp->f_mode |= FMODE_NDELAY;
@@ -544,9 +544,6 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	if (iocb->ki_pos >= size)
 		return -ENOSPC;
 
-	if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT)
-		return -EOPNOTSUPP;
-
 	size -= iocb->ki_pos;
 	if (iov_iter_count(from) > size) {
 		shorted = iov_iter_count(from) - size;
diff --git a/fs/read_write.c b/fs/read_write.c
index 0074afa7ecb3..58233844a9d8 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1641,7 +1641,8 @@ ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
 	if (iocb->ki_flags & IOCB_APPEND)
 		iocb->ki_pos = i_size_read(inode);
 
-	if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT))
+	if ((iocb->ki_flags & IOCB_NOWAIT) &&
+		(!(iocb->ki_flags & IOCB_DIRECT) && !(file->f_mode & FMODE_BUF_WASYNC)))
 		return -EINVAL;
 
 	count = iov_iter_count(from);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b7dd5bd701c0..a526de71b932 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -176,6 +176,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 /* File supports async buffered reads */
 #define FMODE_BUF_RASYNC	((__force fmode_t)0x40000000)
 
+/* File supports async nowait buffered writes */
+#define FMODE_BUF_WASYNC	((__force fmode_t)0x80000000)
+
 /*
  * Attribute flags.  These should be or-ed together to figure out what
  * has been changed!
-- 
2.30.2


  parent reply	other threads:[~2022-02-18 19:58 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-18 19:57 [PATCH v2 00/13] Support sync buffered writes for io-uring Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 01/13] fs: Add flags parameter to __block_write_begin_int Stefan Roesch
2022-02-18 19:59   ` Matthew Wilcox
2022-02-18 20:08     ` Stefan Roesch
2022-02-18 20:13       ` Matthew Wilcox
2022-02-18 20:14         ` Stefan Roesch
2022-02-18 20:22           ` Matthew Wilcox
2022-02-18 20:25             ` Stefan Roesch
2022-02-18 20:35               ` Matthew Wilcox
2022-02-18 20:39                 ` Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 02/13] mm: Introduce do_generic_perform_write Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 03/13] mm: Add support for async buffered writes Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 04/13] fs: split off __alloc_page_buffers function Stefan Roesch
2022-02-18 20:42   ` Matthew Wilcox
2022-02-18 20:50     ` Stefan Roesch
2022-02-19  7:35   ` Christoph Hellwig
2022-02-20  4:23     ` Matthew Wilcox
2022-02-20  4:38       ` Jens Axboe
2022-02-20  4:51         ` Jens Axboe
2022-02-22  8:18       ` Christoph Hellwig
2022-02-22 23:19         ` Jens Axboe
2022-02-18 19:57 ` [PATCH v2 05/13] fs: split off __create_empty_buffers function Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 06/13] fs: Add gfp_t parameter to create_page_buffers() Stefan Roesch
2022-02-21  0:18   ` kernel test robot
2022-02-18 19:57 ` [PATCH v2 07/13] fs: add support for async buffered writes Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 08/13] io_uring: " Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 09/13] io_uring: Add tracepoint for short writes Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 10/13] sched: add new fields to task_struct Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 11/13] mm: support write throttling for async buffered writes Stefan Roesch
2022-02-18 19:57 ` [PATCH v2 12/13] io_uring: " Stefan Roesch
2022-02-18 19:57 ` Stefan Roesch [this message]
2022-02-20 22:38 ` [PATCH v2 00/13] Support sync buffered writes for io-uring Dave Chinner

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