[Ocfs2-devel] [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 at oracle.com>
Reviewed-by: Jeremy Fitzhardinge <jeremy at goop.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Al Viro <viro at ZenIV.linux.org.uk>
Cc: Matthew Wilcox <matthew at wil.cx>
Cc: Nick Piggin <npiggin at kernel.dk>
Cc: Mel Gorman <mel at csn.ul.ie>
Cc: Rik Van Riel <riel at redhat.com>
Cc: Jan Beulich <JBeulich at novell.com>
Cc: Chris Mason <chris.mason at oracle.com>
Cc: Andreas Dilger <adilger at sun.com>
Cc: Ted Ts'o <tytso at mit.edu>
Cc: Mark Fasheh <mfasheh at suse.com>
Cc: Joel Becker <joel.becker at oracle.com>
Cc: Nitin Gupta <ngupta at vflare.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);