[Devel] Re: [PATCH 1/4] Some changes in the kobject mapper

[Daniel Hokka Zakrisson]

Pavel Emelyanov wrote:
> The main thing that I want from the kobj mapper is to add 
> the mode_t on the struct kobj_map that reflects with 
> permissions are associated with this particular map. This 
> mode is to be returned via the kobj_lookup.
> 
> I use the FMODE_XXX flags to handle the permissions bits, 
> as I will compare these ones to the file->f_mode later.
> By default all bits are set (for the initial container).
> 
> The additional things I need are kobj_remap() to change 
> that permission and kobj_iterate() to walk the map.
> 
> The kobj_map_fini() is the roll-back for the kobj_map_init().
> 
> Signed-off-by: Pavel Emelyanov <xemul at openvz.org>
> 
> ...
> @@ -153,3 +237,21 @@ struct kobj_map *kobj_map_init(kobj_probe_t *base_probe, struct mutex *lock)
>  	p->lock = lock;
>  	return p;
>  }
> +
> +void kobj_map_fini(struct kobj_map *map)
> +{
> +	int i;
> +	struct probe *p, *next;
> +
> +	for (i = 0; i < 256; i++) {

This should be 255, shouldn't it?

> +		p = map->probes[i];
> +		while (p->next != NULL) {
> +			next = p->next;
> +			kfree(p);
> +			p = next;
> +		}
> +	}
> +
> +	kfree(p);
> +	kfree(map);
> +}
> diff --git a/include/linux/kobj_map.h b/include/linux/kobj_map.h
> index bafe178..ecfe772 100644
> --- a/include/linux/kobj_map.h
> +++ b/include/linux/kobj_map.h
> @@ -7,8 +7,13 @@ struct kobj_map;
>  
>  int kobj_map(struct kobj_map *, dev_t, unsigned long, struct module *,
>  	     kobj_probe_t *, int (*)(dev_t, void *), void *);
> +int kobj_remap(struct kobj_map *, dev_t, mode_t, unsigned long, struct module *,
> +	     kobj_probe_t *, int (*)(dev_t, void *), void *);
>  void kobj_unmap(struct kobj_map *, dev_t, unsigned long);
> -struct kobject *kobj_lookup(struct kobj_map *, dev_t, int *);
> +struct kobject *kobj_lookup(struct kobj_map *, dev_t, mode_t *, int *);
> +void kobj_map_iterate(struct kobj_map *, int (*fn)(dev_t, int, mode_t, void *),
> +		void *);
>  struct kobj_map *kobj_map_init(kobj_probe_t *, struct mutex *);
> +void kobj_map_fini(struct kobj_map *);
>  
>  #endif
> 
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-- 
Daniel Hokka Zakrisson
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