On Tue, 18 Apr 2000, David S. Miller wrote:
> This would work:
>
> mm_segment_t orig_fs;
>
> orig_fs = get_fs();
> set_fs(KERNEL_DS);
> err = namei("/tmp");
> set_fs(old_fs);
>
> The namei function expects user space pointers, you're sending
> it a kernel pointer, so you have to adjust your mm segment during
> the call.
Ewwww... Yes, it would work, but this is ugly as hell. Mixing user- and
kernelspace pointers is sometimes the only way to do things, but it's
about as lovely as abusing union to transform double into int[2] and
back. In case of namei() it is _not_ needed - lookup_dentry() does the
job just fine.
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