When mounting a windows share with mount.cifs without the "noserverino" option, a call to stat() will fail.


mount.cifs version: 4.6 - I compiled it myself from "cifs-utils-4.5" src package as I had to apply a patch to make the "credentials" option work.

kernel: 2.6.34.7

How to reproduce:
Mount a windows share using an fstab line like this:
//10.110.13.172/intranet$ /mnt/idefix/intranet cifs credentials=/etc/samba.credentials_for_idefix_intranet,rw,uid=gerhard,gid=users,dir_mode=0755,file_mode=0664 0 0

Compile and run the test program with the path to a file on the share as argument:

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>

main(int argc, char **argv)
{
  struct stat statbuf;
  
  if(stat(argv[1], &statbuf) == 0)
    printf("st_ino = %d, st_mode = 0%o, st_size = %d\n", statbuf.st_ino, statbuf.st_mode, statbuf.st_size);
  else{
	fprintf(stderr, "errno:%d, ", errno);
        perror("stat");
  }
  
  return 0;
}

It will fail with:
errno:75, stat: Value too large for defined data type.

Now umount the share an mount it again with the noserverino option using an fstab line like this:
//10.110.13.172/intranet$ /mnt/idefix/intranet cifs noserverino,credentials=/etc/samba.credentials_for_idefix_intranet,rw,uid=gerhard,gid=users,dir_mode=0755,file_mode=0664 0 0

Run the test programm again, and it will display some parts of the stat structure.

What else:
My "hardware" is actually a virtual machine, running under VM-Player.
I have an other (older) virtual machine on my hard disk, which did not require the noserverino option. So I copied my test program - the binary - to that other machine and it was able to "stat" the share.

This environment:

mount.cifs version: 1.10-3.0.32-0.2-2210-SUSE-SL10.3
Kernel 2.6.22.19

Compiling the source code of the test on the older machine and running it on the machine where I encountered the problem gave the same results: failure to "stat" without noserverino.

Therefore I believe, the problem is within the cifs package and not with in stat().

The problem and the workaround is documented at:
http://bugs.php.net/bug.php?id=51266

Gerhard Schiller

PS:
As this is my first bug report, please don't be to harsh in your judgment if something it's not perfect...