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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]>
Subject: [RFC PATCH v3 01/18] block: Add check for async buffered writes to generic_write_checks
Date: Wed, 18 May 2022 16:36:52 -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]>
---
 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 e643aec2b0ef..544d4df33f4f 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1633,7 +1633,9 @@ 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 bbde95387a23..3b479d02e210 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -177,6 +177,9 @@ 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



  reply	other threads:[~2022-05-18 23:37 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-18 23:36 [RFC PATCH v3 00/18] io-uring/xfs: support async buffered writes Stefan Roesch
2022-05-18 23:36 ` Stefan Roesch [this message]
2022-05-18 23:36 ` [RFC PATCH v3 02/18] iomap: Add iomap_page_create_gfp to allocate iomap_pages Stefan Roesch
2022-05-19  8:18   ` Christoph Hellwig
2022-05-18 23:36 ` [RFC PATCH v3 03/18] iomap: Use iomap_page_create_gfp() in __iomap_write_begin Stefan Roesch
2022-05-19  8:19   ` Christoph Hellwig
2022-05-18 23:36 ` [RFC PATCH v3 04/18] iomap: Add async buffered write support Stefan Roesch
2022-05-19  8:25   ` Christoph Hellwig
2022-05-20 18:29     ` Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 05/18] xfs: Add iomap " Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 06/18] fs: Split off remove_needs_file_privs() __remove_file_privs() Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 07/18] fs: Split off file_needs_update_time and __file_update_time Stefan Roesch
2022-05-18 23:36 ` [RFC PATCH v3 08/18] xfs: Enable async write file modification handling Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 09/18] fs: Optimization for concurrent file time updates Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 10/18] xfs: Add async buffered write support Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 11/18] io_uring: Add support for async buffered writes Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 12/18] mm: Move starting of background writeback into the main balancing loop Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 13/18] mm: Move updates of dirty_exceeded into one place Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 14/18] mm: Prepare balance_dirty_pages() for async buffered writes Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 15/18] mm: Add balance_dirty_pages_ratelimited_async() function Stefan Roesch
     [not found]   ` <YoX/[email protected]>
2022-05-19  8:54     ` Jan Kara
2022-05-18 23:37 ` [RFC PATCH v3 16/18] iomap: Use balance_dirty_pages_ratelimited_flags in iomap_write_iter Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 17/18] io_uring: Add tracepoint for short writes Stefan Roesch
2022-05-18 23:37 ` [RFC PATCH v3 18/18] xfs: Enable async buffered write support Stefan Roesch
2022-05-19  8:32   ` Christoph Hellwig
2022-05-20 18:32     ` Stefan Roesch

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