From: Frank van Maarseveen <frankvm@frankvm.com>
Subject: 2.6.23.1 regression: write() data lost after lseek()
Date: Fri, 26 Oct 2007 17:50:39 +0200
Message-ID: <20071026155039.GA23334@janus>
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2.6.23.1 client (using 2.6.22.10 and 2.6.21.7 as server), mount options
according to /proc/mounts:

rw,nodev,vers=3,rsize=32768,wsize=32768,hard,intr,proto=udp,timeo=11,retrans=2,sec=sys


The data of the last write in this program gets lost when run on 2.6.23.1 client:

--------
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

int main(int argc, char **argv)
{
	int d;

	errno = 0;
	d = open(argv[1], O_CREAT|O_WRONLY|O_TRUNC, 0666);
	write(d, "a", 1);
	lseek(d, 2, SEEK_SET);
	write(d, "data lost\n", 10);
	close(d);
	perror("");
	return errno ? 1 : 0;
}
--------

$ ./prog out
Success
$ od -c out
0000000   a  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
0000014


-- 
Frank

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