From: Weston Andros Adamson <dros@netapp.com>
Date: Fri, 18 Oct 2013 19:15:19 +0000 (-0400)
Subject: NFS: add support for multiple sec= mount options
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~60^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4d4b69dd847a098cdca341c45326f6c6f61b8691;p=pandora-kernel.git

NFS: add support for multiple sec= mount options

This patch adds support for multiple security options which can be
specified using a colon-delimited list of security flavors (the same
syntax as nfsd's exports file).

This is useful, for instance, when NFSv4.x mounts cross SECINFO
boundaries. With this patch a user can use "sec=krb5i,krb5p"
to mount a remote filesystem using krb5i, but can still cross
into krb5p-only exports.

New mounts will try all security options before failing.  NFSv4.x
SECINFO results will be compared against the sec= flavors to
find the first flavor in both lists or if no match is found will
return -EPERM.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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