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Date:	Thu, 14 Apr 2011 14:16:31 -0700
From:	Dan Magenheimer <>
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 <>
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 <>


 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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