commit 6b3944e42e2e554aa5a4be681ecd70dccd459114
author David Howells <dhowells@redhat.com> Thu Oct 11 22:45:49 2018 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Fri Oct 12 13:18:57 2018 +0200
tree 811bc9bccb4da48aed07bd73891b65181b6e5873
parent 4ea07abbfbdadb10bc67c2b78dc2dbfafa4b1009

afs: Fix cell proc list

Access to the list of cells by /proc/net/afs/cells has a couple of
problems:

 (1) It should be checking against SEQ_START_TOKEN for the keying the
     header line.

 (2) It's only holding the RCU read lock, so it can't just walk over the
     list without following the proper RCU methods.

Fix these by using an hlist instead of an ordinary list and using the
appropriate accessor functions to follow it with RCU.

Since the code that adds a cell to the list must also necessarily change,
sort the list on insertion whilst we're at it.

Fixes: 989782dcdc91 ("afs: Overhaul cell database management")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>