[PATCH V8 5/8] ext3: add cleancache support

[Dan Magenheimer]

[PATCH V8 5/8] ext3: add cleancache support

This fifth patch of eight in this cleancache series "opts-in"
cleancache for ext3.  Filesystems must explicitly enable
cleancache by calling cleancache_init_fs anytime an instance
of the filesystem is mounted. For ext3, all other cleancache
hooks are in the VFS layer including the matching cleancache_flush_fs
hook which must be called on unmount.

Details and a FAQ can be found in Documentation/vm/cleancache.txt

[v6-v8: no changes]
[v5: jeremy@xxxxxxxx: simplify init hook and any future fs init changes]
Signed-off-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Reviewed-by: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Acked-by: Andreas Dilger <adilger@xxxxxxx>
Cc: Ted Ts'o <tytso@xxxxxxx>
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: Mark Fasheh <mfasheh@xxxxxxxx>
Cc: Joel Becker <joel.becker@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>

---

Diffstat:
 fs/ext3/super.c                          |    2 ++
 1 file changed, 2 insertions(+)

--- linux-2.6.39-rc3/fs/ext3/super.c	2011-04-11 18:21:51.000000000 -0600
+++ linux-2.6.39-rc3-cleancache/fs/ext3/super.c	2011-04-13 17:10:40.918915872 -0600
@@ -36,6 +36,7 @@
 #include <linux/quotaops.h>
 #include <linux/seq_file.h>
 #include <linux/log2.h>
+#include <linux/cleancache.h>
 
 #include <asm/uaccess.h>
 
@@ -1367,6 +1368,7 @@ static int ext3_setup_super(struct super
 	} else {
 		ext3_msg(sb, KERN_INFO, "using internal journal");
 	}
+	cleancache_init_fs(sb);
 	return res;
 }
 
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