# \[PATCH v2 2/2\] RWF\_ODSYNC flag for pwritev2

- From: Milosz Tanski \<hidden\>
- Date: 2014-11-06 15:44:27 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2014/11/89588
- Thread: https://ratatoskr.run/linux-api/2014/11/89588/t.md

```text
Document RWF_ODSYNC flag for pwritev2 as implemented by Christoph Hellwig.

Signed-off-by: Milosz Tanski <redacted>
---
 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
```