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VFS: introduce s_dirty accessors 

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@nokia.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Artem Bityutskiy 2010-06-10 13:56:33 +03:00 committed by Linus Torvalds
parent 47a716cf0c
commit 140236b4b1
1 changed files with 13 additions and 0 deletions
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13
include/linux/fs.h
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@ -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))