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From: Stefan Roesch <[email protected]>
To: <[email protected]>, <[email protected]>,
	<[email protected]>, <[email protected]>,
	<[email protected]>
Cc: <[email protected]>, <[email protected]>, <[email protected]>,
	<[email protected]>, <[email protected]>,
	Christoph Hellwig <[email protected]>
Subject: [PATCH v8 07/14] fs: Add check for async buffered writes to generic_write_checks
Date: Wed, 8 Jun 2022 10:17:34 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

This introduces the flag FMODE_BUF_WASYNC. If devices support async
buffered writes, this flag can be set. It also modifies the check in
generic_write_checks to take async buffered writes into consideration.

Signed-off-by: Stefan Roesch <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
---
 fs/read_write.c    | 4 +++-
 include/linux/fs.h | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index b1b1cdfee9d3..a1f4d45c2406 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1649,7 +1649,9 @@ int generic_write_checks_count(struct kiocb *iocb, loff_t *count)
 	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;
 
 	return generic_write_check_limits(iocb->ki_filp, iocb->ki_pos, count);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9ad5e3520fae..bc84847c201e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -180,6 +180,9 @@ 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:[~2022-06-08 17:27 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-08 17:17 [PATCH v8 00/14] io-uring/xfs: support async buffered writes Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 01/14] mm: Move starting of background writeback into the main balancing loop Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 02/14] mm: Move updates of dirty_exceeded into one place Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 03/14] mm: Add balance_dirty_pages_ratelimited_flags() function Stefan Roesch
2022-06-08 18:44   ` Matthew Wilcox
2022-06-08 17:17 ` [PATCH v8 04/14] iomap: Add flags parameter to iomap_page_create() Stefan Roesch
2022-06-08 18:51   ` Matthew Wilcox
2022-06-08 17:17 ` [PATCH v8 05/14] iomap: Add async buffered write support Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 06/14] iomap: Return -EAGAIN from iomap_write_iter() Stefan Roesch
2022-06-08 19:02   ` Matthew Wilcox
2022-06-09 18:49     ` Stefan Roesch
2022-06-08 17:17 ` Stefan Roesch [this message]
2022-06-10 11:50   ` [PATCH v8 07/14] fs: Add check for async buffered writes to generic_write_checks Christian Brauner
2022-06-08 17:17 ` [PATCH v8 08/14] fs: add __remove_file_privs() with flags parameter Stefan Roesch
2022-06-10 11:53   ` Christian Brauner
2022-06-08 17:17 ` [PATCH v8 09/14] fs: Split off inode_needs_update_time and __file_update_time Stefan Roesch
2022-06-10 11:55   ` Christian Brauner
2022-06-08 17:17 ` [PATCH v8 10/14] fs: Add async write file modification handling Stefan Roesch
2022-06-10 12:38   ` Christian Brauner
2022-06-08 17:17 ` [PATCH v8 11/14] io_uring: Add support for async buffered writes Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 12/14] io_uring: Add tracepoint for short writes Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 13/14] xfs: Specify lockmode when calling xfs_ilock_for_iomap() Stefan Roesch
2022-06-08 17:17 ` [PATCH v8 14/14] xfs: Add async buffered write support Stefan Roesch

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