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From: Jakob Goldbach on 2 Jul 2010 09:10
This patch allows notifications groups to get events on entire fs not
just on registered inodes.
I want to use it for a notification group that tracks all changes to
the filesystem in order to do faster backups.

Is this a good idea ?

Thanks,
Jakob

---
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index fcc2f06..58158cf 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -147,7 +147,7 @@ void fsnotify(struct inode *to_tell, __u32 mask,
void *data, int data_is, const
if (!(test_mask & fsnotify_mask))
return;

- if (!(test_mask & to_tell->i_fsnotify_mask))
+ if (!(test_mask & (to_tell->i_fsnotify_mask |
to_tell->i_sb->s_fsnotify_mask)))
return;
/*
* SRCU!! the groups list is very very much read only and the path is
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 471e1ff..cd65f7a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1382,6 +1382,9 @@ struct super_block {
* generic_show_options()
*/
char *s_options;
+#ifdef CONFIG_FSNOTIFY
+ __u32 s_fsnotify_mask;
+#endif
};

extern struct timespec current_fs_time(struct super_block *sb);
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