dereferencing filenames from a vfs_write probe

[Ananth N Mavinakayanahalli]

On Wed, Mar 19, 2008 at 10:37:34PM -0500, dave-systemtap@skeptech.org wrote:
 
> Poking around the kernel headers I see the dentry struct in
> includes/linux/dcache.h has a struct of type qstr (quick string) called
> 'd_name'.  I see that the qstr struct has within it a pointer to a const
> unsigned char called 'name'.  This seems tantalizingly close to what I'm
> looking for but dereferencing it with the code above using
> $file->f_dentry->d_name->name returns a type mismatch error. The
> derefernced thingy called 'name' is appearently of type 'long', not a
> pointer to a string.

Try kernel_string($file->f_dentry->d_name->name) instead.

Ananth