[V8,7/8] ext4: add cleancache support

Commit Message

Dan Magenheimer April 14, 2011, 9:19 p.m. UTC

[PATCH V8 7/8] ext4: add cleancache support

This seventh patch of eight in this cleancache series "opts-in"
cleancache for ext4.  Filesystems must explicitly enable cleancache
by calling cleancache_init_fs anytime an instance of the filesystem
is mounted. For ext4, 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: [e-mail]: simplify init hook and any future fs init changes]
Signed-off-by: Dan Magenheimer <[e-mail]>
Reviewed-by: Jeremy Fitzhardinge <[e-mail]>
Reviewed-by: Konrad Rzeszutek Wilk <[e-mail]>
Acked-by: Andreas Dilger <[e-mail]>
Cc: Ted Ts'o <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: Al Viro <[e-mail]>
Cc: Matthew Wilcox <[e-mail]>
Cc: Nick Piggin <[e-mail]>
Cc: Mel Gorman <[e-mail]>
Cc: Rik Van Riel <[e-mail]>
Cc: Jan Beulich <[e-mail]>
Cc: Chris Mason <[e-mail]>
Cc: Mark Fasheh <[e-mail]>
Cc: Joel Becker <[e-mail]>
Cc: Nitin Gupta <[e-mail]>

---

Diffstat:
 fs/ext4/super.c                          |    2 ++
 1 file changed, 2 insertions(+)

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Patch

--- linux-2.6.39-rc3/fs/ext4/super.c	2011-04-11 18:21:51.000000000 -0600
+++ linux-2.6.39-rc3-cleancache/fs/ext4/super.c	2011-04-13 17:10:52.708850707 -0600
@@ -38,6 +38,7 @@ 
 #include <linux/ctype.h>
 #include <linux/log2.h>
 #include <linux/crc16.h>
+#include <linux/cleancache.h>
 #include <asm/uaccess.h>
 
 #include <linux/kthread.h>
@@ -1932,6 +1933,7 @@  static int ext4_setup_super(struct super
 			EXT4_INODES_PER_GROUP(sb),
 			sbi->s_mount_opt, sbi->s_mount_opt2);
 
+	cleancache_init_fs(sb);
 	return res;
 }