simplifying linux_emul_convpath()

[Don Lewis]

On 15 Jan, Tim Robbins wrote:
> On Wed, Jan 14, 2004 at 05:08:51AM -0800, Don Lewis wrote:
> 
>> I just stumbled across a vnode locking violation in
>> linux_emul_convpath().  Rather than locking and unlocking each vnode for
>> the VOP_GETATTR() calls, is there any reason that this code should not
>> be simplified to just compare the vnode pointers rather than fetching
>> the vnode attributes and comparing the attributes for equality.
> 
> I'm having trouble convincing myself that comparing vnode pointers
> would work with stackable filesystems. Then again, null_getattr()
> changes va_fsid, so linux_emul_convpath() may not handle stacking
> properly right now anyway.

They won't compare equal in either case, but I think that is what you
want in this case anyway.  I don't think we want a Linux application
opening a file to trigger the match code if it does a lookup on
/some/other/path if that location is a nullfs mounted version of of
/compat/linux.