Re: nfs MAP_SHARED corruption fix

From: Kurt Garloff (garloff@suse.de)
Date: Tue May 08 2001 - 10:38:47 EST

On Tue, May 08, 2001 at 05:21:02PM +0200, Trond Myklebust wrote:
> Could you instead detail exactly which corruption problem you are
> trying to fix?

int fd = open (name, O_RDWR);
char* adr = (char*) mmap (0, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
/* write to *adr through *(ard+len-1) */
/* Try adding here: msync (adr, len, MS_SYNC); */
munmap (adr, len);
close (fd);

The code works on files on local harddisks and on NFS volumes on a 2.2
kernel, but breaks on NFS drives on a 2.4.4 kernel.
msync() works around the bug.
Andrea's patch did help as well.

Regards, 

-- 
Kurt Garloff  <garloff@suse.de>                          Eindhoven, NL
GPG key: See mail header, key servers         Linux kernel development
SuSE GmbH, Nuernberg, FRG                               SCSI, Security
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