[PATCH v2 RESEND] fs: return EPERM on immutable inode

[Al Viro]

On Tue, Aug 02, 2016 at 07:58:28PM +0800, Eryu Guan wrote:
> In most cases, EPERM is returned on immutable inode, and there're only a
> few places returning EACCES. I noticed this when running LTP on
> overlayfs, setxattr03 failed due to unexpected EACCES on immutable
> inode.
> 
> So converting all EACCES to EPERM on immutable inode.
> 
> Acked-by: Dave Chinner <dchinner at redhat.com>
> Signed-off-by: Eryu Guan <guaneryu at gmail.com>

Applied.