linux-kernel - [PATCH v2 2/2] RWF_ODSYNC flag for pwritev2

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Message-Id: <ee4674ce06aaabf8bee50b4f0168af8729bc2ef1.1415288353.git.milosz@adfin.com>
Date:	Thu,  6 Nov 2014 10:44:27 -0500
From:	Milosz Tanski <milosz@...in.com>
To:	linux-kernel@...r.kernel.org
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>,
	Theodore Ts'o <tytso@....edu>,
	Al Viro <viro@...iv.linux.org.uk>, linux-api@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-man@...r.kernel.org
Subject: [PATCH v2 2/2] RWF_ODSYNC flag for pwritev2

Document RWF_ODSYNC flag for pwritev2 as implemented by Christoph Hellwig.

Signed-off-by: Milosz Tanski <milosz@...in.com>
---
 man2/readv.2 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/man2/readv.2 b/man2/readv.2
index 31b3870..ff1405c 100644
--- a/man2/readv.2
+++ b/man2/readv.2
@@ -203,6 +203,15 @@ contains a bitwise OR of one or more of the following flags:
 .BR RWF_NONBLOCK " (only " preadv2() " since Linux 3.19)"
 Performs a non-blocking operation for regular files (not sockets) opened in buffered mode (not
 .BR O_DIRECT ")."
+.TP
+.BR RWF_DSYNC " (only " pwritev2() " since Linux 3.19)"
+Write operation will complete according to the requirements of synchronized I/O
+.I data
+integrity completion. This has the same effect on the operation as if the file handle was created by
+.BR open(2)
+with the
+.BR O_DSYNC
+flag.
 
 .SH RETURN VALUE
 On success,
@@ -333,6 +342,7 @@ nwritten = writev(STDOUT_FILENO, iov, 2);
 .fi
 .in
 .SH SEE ALSO
+.BR open(2),
 .BR pread (2),
 .BR read (2),
 .BR write (2)
-- 
1.9.1

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