[...]
> +int configfs_register_group(struct config_group *parent_group,
> + struct config_group *group)
> +{
> + struct dentry *dentry;
> + int ret;
> +
> + link_group(parent_group, group);
This needs to hold subsys->su_mutex
I think from here to before the return we need to hold the parent dentry
mutex with I_MUTEX_PARENT
> +
> + ret = create_default_group(parent_group, group, &dentry);
> + if (ret == 0)
> + configfs_dir_set_ready(dentry->d_fsdata);
This needs to hold configfs_dirent_lock
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(configfs_register_group);
> +
> +void configfs_unregister_group(struct config_group *group)
> +{
> + struct dentry *dentry = group->cg_item.ci_dentry;
> +
We probably need to do the detach_prep stuff somewhere in here.
I think this needs to hold the parent dentry mutex with I_MUTEX_PARENT from
here to ...
> + mutex_lock(&d_inode(dentry)->i_mutex);
> + configfs_detach_group(&group->cg_item);
> + d_inode(dentry)->i_flags |= S_DEAD;
> + dont_mount(dentry);
> + mutex_unlock(&d_inode(dentry)->i_mutex);
> +
> + d_delete(dentry);
... here
> + dput(dentry);
> + unlink_group(group);
needs subsys->su_mutex
> +}
> +EXPORT_SYMBOL(configfs_unregister_group);
> +
> int configfs_register_subsystem(struct configfs_subsystem *subsys)
> {
> int err;
> diff --git a/include/linux/configfs.h b/include/linux/configfs.h
> index c9e5c57..726980e 100644
> --- a/include/linux/configfs.h
> +++ b/include/linux/configfs.h
> @@ -251,6 +251,10 @@ static inline struct configfs_subsystem *to_configfs_subsystem(struct config_gro
> int configfs_register_subsystem(struct configfs_subsystem *subsys);
> void configfs_unregister_subsystem(struct configfs_subsystem *subsys);
>
> +int configfs_register_group(struct config_group *parent_group,
> + struct config_group *group);
> +void configfs_unregister_group(struct config_group *group);
> +
> /* These functions can sleep and can alloc with GFP_KERNEL */
> /* WARNING: These cannot be called underneath configfs callbacks!! */
> int configfs_depend_item(struct configfs_subsystem *subsys, struct config_item *target);
>
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