On Jun 4, 2009, at 5:41 AM, Artem Bityutskiy wrote:
From: Artem Bityutskiy <Artem.Bityutskiy@xxxxxxxxx>
This patch introduces 3 new VFS helpers: 'mark_sb_dirty()',
'mark_sb_clean()', and 'sb_is_dirty()'.
Should the name be is_sb_dirty() for consistency?
Felix
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>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
include/linux/fs.h | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 73242c3..2d67017 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1782,6 +1782,23 @@ 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);
+/*
+ * Note, VFS does not provide any protection for the super block
clean/dirty
+ * state. File-systems should take care of this.
+ */
+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))
--
1.6.0.6
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