[RFC] fsnotify: track events on entire fs

[Jakob Goldbach]

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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