From: Dan Magenheimer Subject: [PATCH V8 2/8] fs: add field to superblock to support cleancache Date: Thu, 14 Apr 2011 14:16:31 -0700 Message-ID: <20110414211631.GA27708__7207.95183810896$1302815893$gmane$org@ca-server1.us.oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: chris.mason@oracle.com, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, adilger.kernel@dilger.ca, tytso@mit.edu, mfasheh@suse.com, jlbec@evilplan.org, matthew@wil.cx, linux-btrfs@ Return-path: Received: from rcsinet10.oracle.com ([148.87.113.121]:32891 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751737Ab1DNVSA (ORCPT ); Thu, 14 Apr 2011 17:18:00 -0400 Content-Disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: [PATCH V8 2/8] fs: add field to superblock to support cleancache This second patch of eight in this cleancache series adds a field to the generic superblock to squirrel away a pool identifier that is dynamically provided by cleancache-enabled filesystems at mount time to uniquely identify files and pages belonging to this mounted filesystem. Details and a FAQ can be found in Documentation/vm/cleancache.txt [v8: trivial merge conflict update] Signed-off-by: Dan Magenheimer Reviewed-by: Jeremy Fitzhardinge Reviewed-by: Konrad Rzeszutek Wilk Cc: Andrew Morton Cc: Al Viro Cc: Matthew Wilcox Cc: Nick Piggin Cc: Mel Gorman Cc: Rik Van Riel Cc: Jan Beulich Cc: Chris Mason Cc: Andreas Dilger Cc: Ted Ts'o Cc: Mark Fasheh Cc: Joel Becker Cc: Nitin Gupta --- Diffstat: include/linux/fs.h | 5 +++++ 1 file changed, 5 insertions(+) --- linux-2.6.39-rc3/include/linux/fs.h 2011-04-11 18:21:51.000000000 -0600 +++ linux-2.6.39-rc3-cleancache/include/linux/fs.h 2011-04-13 16:46:44.444861817 -0600 @@ -1430,6 +1430,11 @@ struct super_block { */ char __rcu *s_options; const struct dentry_operations *s_d_op; /* default d_op for dentries */ + + /* + * Saved pool identifier for cleancache (-1 means none) + */ + int cleancache_poolid; }; extern struct timespec current_fs_time(struct super_block *sb);