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From: Jakob Goldbach on 13 Jul 2010 11:50
(Resending, this time with fsnotify maintainer cc'ed)

This patch allows notification groups to get events on the entire filesystem,
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 or bad idea?

/Jakob


diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index fcc2f06..aa9e204 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -147,7 +147,9 @@ 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 68ca1b0..102acf5 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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