Peter Teoh wrote:
quoted text
> On Thu, Aug 21, 2008 at 1:24 PM, Om Narasimhan <om.turyx@gmail.com> wrote:
> 
>> [om@testserv ~]$ stap -vv -u /space/stap/inode-watch.stp
>> SystemTap translator/driver (version 0.6.2/0.127 built 2008-03-27)
>> Copyright (C) 2005-2008 Red Hat, Inc. and others
> 
> my version (not the latest though) has no problem compiling:
> 
> /mnt/hd0/download/linux-2.6-latest/stp>stap -V
> SystemTap translator/driver (version 0.7.1/0.131 non-git sources)
> Copyright (C) 2005-2008 Red Hat, Inc. and others
> This is free software; see the source for copying conditions.
> 
> but runtime it hanged and freezed.....which i am trying to determine why.

I think my code snippet was wrong. Actually, it should be something like,
$ cat /space/stap/inode-watch.stp
# input device number and inode number, this prints out who accesses the 
file
#
  probe kernel.function ("vfs_read"), kernel.function("vfs_write")
{
        inode = $file->f_path->dentry->d_inode->i_ino
        dev_nr = $file->f_path->dentry->d_inode->i_sb->s_dev

        if(inode == $1 && (dev_nr == ($2 << 20 | $3))){
                printf("%s(%d) -> %s\n", execname(), pid(), probefunc())
        }
}

When I took out the f_dentry, (which is #defined in fs.h) and replaced 
it with f_path->dentry (in C, it would be f_path.dentry), it started 
working fine.

So, it may not be a bug with systemtap after all.
But if f_dentry is supposed to work, it would be a  bug. I don't know 
about this.

Thanks,
Om.

--
To unsubscribe from this list: send an email with
"unsubscribe kernelnewbies" to ecartis@nl.linux.org
Please read the FAQ at http://kernelnewbies.org/FAQ