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

[Dan Magenheimer]

[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@xxxxxxxxxx>
Reviewed-by: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <matthew@xxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Rik Van Riel <riel@xxxxxxxxxx>
Cc: Jan Beulich <JBeulich@xxxxxxxxxx>
Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: Andreas Dilger <adilger@xxxxxxx>
Cc: Ted Ts'o <tytso@xxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxxx>
Cc: Joel Becker <joel.becker@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>

---

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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