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From: Artem Bityutskiy on 10 Jun 2010 07:10
From: Artem Bityutskiy <Artem.Bityutskiy(a)nokia.com>

This patch introduces 3 VFS accessors: 'sb_mark_dirty()',
'sb_mark_clean()', and 'sb_is_dirty()'. They simply
set 'sb->s_dirt' or test 'sb->s_dirt'. The plan is to make
every FS use these accessors later instead of manipulating
the 'sb->s_dirt' flag directly.

Ultimately, this change is a preparation for the periodic
superblock synchronization optimization which is about
preventing the "sync_supers" kernel thread from waking up
even if there is nothing to synchronize.

This patch does not do any functional change, just adds
accessor functions.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy(a)nokia.com>
---
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 471e1ff..68ca1b0 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1783,6 +1783,19 @@ extern int get_sb_pseudo(struct file_system_type *, char *,
struct vfsmount *mnt);
extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);

+static inline void sb_mark_dirty(struct super_block *sb)
+{
+ sb->s_dirt = 1;
+}
+static inline void sb_mark_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))
--
1.7.0.1

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