From: M. Mohan Kumar <mohan@in.ibm.com>
Date: Tue, 5 Feb 2013 08:55:05 +0000 (+0530)
Subject: fs/9p: Fix atomic_open
X-Git-Tag: v3.9-rc1~136^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6f4bee02f682d1c86ece297871b78ae01afaaf4;p=pandora-kernel.git

fs/9p: Fix atomic_open

Return EEXISTS if requested file already exists, without this patch open
call will always succeed even if the file exists and user specified
O_CREAT|O_EXCL.

Following test code can be used to verify this patch. Without this patch
executing following test code on 9p mount will result in printing 'test case
failed' always.

main()
{
        int fd;

        /* first create the file */
        fd = open("./file", O_CREAT|O_WRONLY);
        if (fd < 0) {
                perror("open");
                return -1;
        }
        close(fd);

        /* Now opening same file with O_CREAT|O_EXCL should fail */
        fd = open("./file", O_CREAT|O_EXCL);
        if (fd < 0 && errno == EEXIST)
	        printf("test case pass\n");
        else
	        printf("test case failed\n");
        close(fd);
        return 0;
}

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
---

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