linux-ext4 - [PATCH V8 2/8] fs: add field to superblock to support cleancache

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Date:	Thu, 14 Apr 2011 14:16:31 -0700
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	chris.mason@...cle.com, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, adilger.kernel@...ger.ca, tytso@....edu,
	mfasheh@...e.com, jlbec@...lplan.org, matthew@....cx,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	ocfs2-devel@....oracle.com, linux-mm@...ck.org, hch@...radead.org,
	ngupta@...are.org, jeremy@...p.org, JBeulich@...ell.com,
	kurt.hackel@...cle.com, npiggin@...nel.dk,
	dave.mccracken@...cle.com, riel@...hat.com, avi@...hat.com,
	konrad.wilk@...cle.com, dan.magenheimer@...cle.com, mel@....ul.ie,
	yinghan@...gle.com, gthelen@...gle.com,
	torvalds@...ux-foundation.org
Subject: [PATCH V8 2/8] fs: add field to superblock to support cleancache

[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 <dan.magenheimer@...cle.com>
Reviewed-by: Jeremy Fitzhardinge <jeremy@...p.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Matthew Wilcox <matthew@....cx>
Cc: Nick Piggin <npiggin@...nel.dk>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Rik Van Riel <riel@...hat.com>
Cc: Jan Beulich <JBeulich@...ell.com>
Cc: Chris Mason <chris.mason@...cle.com>
Cc: Andreas Dilger <adilger@....com>
Cc: Ted Ts'o <tytso@....edu>
Cc: Mark Fasheh <mfasheh@...e.com>
Cc: Joel Becker <joel.becker@...cle.com>
Cc: Nitin Gupta <ngupta@...are.org>

---

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);
--
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