[CSL #248914] [OpenAFS] flock() behavior openafs-1.2.11

[David Thompson]

Derrick J Brashear wrote:
>
>fine, so i'll guess this function calls one of our ops (getattr?) and 
>somehow loses, because EACCES shouldn't be coming from afs_lockctl (at 
>least not directly)
>
>Can you fstrace both cases?

Here's the sample C program I'm using:

#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

char *fname = "/s/db-apps/lib/GradApp/lib/GradApp.pbk";

main ()
{
  int fd, ret;

  fd = open (fname, O_RDONLY);

  ret = flock (fd, LOCK_SH);

  exit (0);
}

I think I have the helpful part of the fstrace.  Tell me if you need more.

Box 1 (the flock succeeds):

<snip>
time 119.118525, pid 29453: d_delete inode 0xe13ee698 d_name lib/GradApp 
time 119.118525, pid 29453: Access vp 0xe1077d3c mode 0x40 len 0x800 
time 119.118525, pid 29453: Access vp 0xe13ef034 mode 0x40 len 0x800 
time 119.118525, pid 29453: Access vp 0xe13f036c mode 0x100 len 0x23e8 
time 119.118525, pid 29453: Open 0xe13f036c flags 0x0 
time 119.118525, pid 29453: Open 0xe13f036c flags 0xf423f 
time 119.118525, pid 29453: Close 0xe13f036c flags 0x0 
time 119.118525, pid 29453: d_delete inode 0xe13f036c d_name lib/GradApp.pbk 

AFS Trace Dump - Completed

Box 2 (the flock fails):

<snip>
time 962.599815, pid 21833: d_delete inode 0x420bdf5c d_name lib/GradApp 
time 962.599815, pid 21833: Access vp 0x4204de4c mode 0x40 len 0x800 
time 962.599815, pid 21833: Access vp 0x4203b168 mode 0x40 len 0x800 
time 962.599815, pid 21833: Access vp 0x422de2c4 mode 0x100 len 0x23e8 
time 962.599815, pid 21833: Open 0x422de2c4 flags 0x0 
time 962.599815, pid 21833: Open 0x422de2c4 flags 0xf423f 
time 962.599815, pid 21833: Analyze RPC op 13 conn 0x2128b4c0 code 0xd user 
0x417529fa
time 962.599815, pid 21833: Returning code 13 from 1 
time 962.599815, pid 21833: Returning code 13 from 3 
time 962.599815, pid 21833: Close 0x422de2c4 flags 0x0 
time 962.599815, pid 21833: d_delete inode 0x422de2c4 d_name lib/GradApp.pbk 

AFS Trace Dump - Completed

Dave