[PATCH 01/19] VFS: introduce helpers for manipulation s_dirty flag

From: Artem Bityutskiy
Date: Wed May 27 2009 - 07:12:57 EST

From: Artem Bityutskiy <Artem.Bityutskiy@xxxxxxxxx>
Subject: [PATCH] VFS: introduce helpers for manipulation s_dirty flag

This patch introduces 3 new VFS helpers: 'mark_sb_dirty()',
'mark_sb_clean()', and 'sb_is_dirty()'. The helpers simply
set 'sb->s_dirt' or test 'sb->s_dirt'. The plan is to make
every FS use these helpers instead of manipulating
'sb->s_dirt' directly. And the further plan is to stop the
periodic write-back when there is no dirt.

This patch is just a preparation. No functional changes yet.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
include/linux/fs.h | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 73242c3..437939c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1782,6 +1782,19 @@ extern int get_sb_pseudo(struct file_system_type *, char *,
extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
int __put_super_and_need_restart(struct super_block *sb);

+static inline void mark_sb_dirty(struct super_block *sb)
+ sb->s_dirt = 1;
+static inline void mark_sb_clean(struct super_block *sb)
+ sb->s_dirt = 0;
+static inline int sb_is_dirty(struct super_block *sb)
+ return sb->s_dirt;
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \
(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))

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