System Tap help

[V.Ravikumar]

On Thu, Apr 12, 2012 at 10:38 AM, V.Ravikumar
<ravikumar.vallabhu at gmail.com>wrote:

> Hi all,
> I'm probing sys_write system call using system tap to get modified file
> name along with UID.
> Here is code snippet.
>
> probe kernel.function ("vfs_write")
> {
>
>         filename = user_string($file->f_dentry->d_name->name)  // for
> 2.6.18 kernel.
>         printf ("%d %s\n",uid,filename)
> }
> I got sample program to get inode number as below
> inode_nr = $file->f_path->dentry->d_inode->i_ino . This I changed to get
> file name, I'm getting file name as empty.
>
> With above program i'm getting file name as unknown.
> My question is does above code snippet is correct to get file name ? If
> not could somebody please let me know the correct implementation.
>
>
I got how to get file name properly.

> filename = user_string($file->f_dentry->d_name->name)  // for 2.6.18
  Here I need to use kernel_string instead of user_string

Regards,
Ravi
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