Re: kern_path() returns error in kernel 4.4

From	Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups	linux.kernel
Subject	Re: kern_path() returns error in kernel 4.4
Date	2016-06-13 17:50 +0200
Message-ID	<rJChI-8go-25@gated-at.bofh.it> (permalink)
References	<rJwci-4dU-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Jun 13, 2016 at 05:12:27PM +0800, dongke di wrote:
> struct path path;
> int r = kern_path( "/tmp/abc.txt", LOOKUP_FOLLOW | LOOKUP_PARENT, &path );
> 
> The file abc.txt does not exist.
> 
> On Ubuntu 14.04 ( kernel 3.13 ), r is zero (succed).
> On Ubuntu 16.04 ( kernel 4.4 ), r is -2 ( fail).
> 
> Is it a bug or other else ?

It is - in the code that passes LOOKUP_PARENT to kern_path().  What are
is it trying to do there?  Need more context...

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kern_path() returns error in kernel 4.4 dongke di <didongke@gmail.com> - 2016-06-13 11:20 +0200
  Re: kern_path() returns error in kernel 4.4 Al Viro <viro@ZenIV.linux.org.uk> - 2016-06-13 17:50 +0200

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