Re: chmod from LSM

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mhalcrowat_private

On Thu, May 22, 2003 at 09:52:32AM -0700, Seth Arnold wrote:
> Hopefully, your module is already working with a dentry or inode, in
> which case the __user_walk() function is superfluous. (Given a pathname
> _in userspace_, it copies the pathname to the kernel and then performs a
> lookup on the name to find a dentry.)

Hence the ``user'' in ``user_walk''... :-)  It turned out that
path_walk was my friend in this case.  FYI, here's how I did it:

struct nameidata nd;
nd.dentry = current->fs->root;
nd.last_type = LAST_ROOT;
nd.flags = 0;
error = path_walk( filename, &nd );
// now do something with nd.dentry...

Oh, and not setting up your nameidata struct correctly before the
path_walk() call seems to be a sure-fire way to oops your kernel.

Thanks for your help,
Mike

-- 
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Michael Halcrow                             | mhalcrowat_private 
Developer, IBM Linux Technology Center      |                      
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