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Date:   Wed, 2 May 2018 19:11:33 +0100 (BST)
From:   James Simmons <jsimmons@infradead.org>
To:     NeilBrown <neilb@suse.com>
cc:     Oleg Drokin <oleg.drokin@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andreas Dilger <andreas.dilger@intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lustre Development List <lustre-devel@lists.lustre.org>
Subject: Re: [PATCH 01/10] staging: lustre: ldlm: store name directly in
 namespace.
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References: <152514658325.17843.11455067361317157487.stgit@noble> <152514675876.17843.12443354625160742215.stgit@noble>
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> Rather than storing the name of a namespace in the
> hash table, store it directly in the namespace.
> This will allow the hashtable to be changed to use
> rhashtable.
> 
> Signed-off-by: NeilBrown <neilb@suse.com>

Reviewed-by: James Simmons <jsimmons@infradead.org>

> ---
>  drivers/staging/lustre/lustre/include/lustre_dlm.h |    5 ++++-
>  drivers/staging/lustre/lustre/ldlm/ldlm_resource.c |    5 +++++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/lustre/lustre/include/lustre_dlm.h b/drivers/staging/lustre/lustre/include/lustre_dlm.h
> index d668d86423a4..b3532adac31c 100644
> --- a/drivers/staging/lustre/lustre/include/lustre_dlm.h
> +++ b/drivers/staging/lustre/lustre/include/lustre_dlm.h
> @@ -362,6 +362,9 @@ struct ldlm_namespace {
>  	/** Flag indicating if namespace is on client instead of server */
>  	enum ldlm_side		ns_client;
>  
> +	/** name of this namespace */
> +	char			*ns_name;
> +
>  	/** Resource hash table for namespace. */
>  	struct cfs_hash		*ns_rs_hash;
>  
> @@ -878,7 +881,7 @@ static inline bool ldlm_has_layout(struct ldlm_lock *lock)
>  static inline char *
>  ldlm_ns_name(struct ldlm_namespace *ns)
>  {
> -	return ns->ns_rs_hash->hs_name;
> +	return ns->ns_name;
>  }
>  
>  static inline struct ldlm_namespace *
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c b/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c
> index 6c615b6e9bdc..43bbc5fd94cc 100644
> --- a/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c
> +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c
> @@ -688,6 +688,9 @@ struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
>  	ns->ns_obd      = obd;
>  	ns->ns_appetite = apt;
>  	ns->ns_client   = client;
> +	ns->ns_name     = kstrdup(name, GFP_KERNEL);
> +	if (!ns->ns_name)
> +		goto out_hash;
>  
>  	INIT_LIST_HEAD(&ns->ns_list_chain);
>  	INIT_LIST_HEAD(&ns->ns_unused_list);
> @@ -730,6 +733,7 @@ struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
>  	ldlm_namespace_sysfs_unregister(ns);
>  	ldlm_namespace_cleanup(ns, 0);
>  out_hash:
> +	kfree(ns->ns_name);
>  	cfs_hash_putref(ns->ns_rs_hash);
>  out_ns:
>  	kfree(ns);
> @@ -993,6 +997,7 @@ void ldlm_namespace_free_post(struct ldlm_namespace *ns)
>  	ldlm_namespace_debugfs_unregister(ns);
>  	ldlm_namespace_sysfs_unregister(ns);
>  	cfs_hash_putref(ns->ns_rs_hash);
> +	kfree(ns->ns_name);
>  	/* Namespace \a ns should be not on list at this time, otherwise
>  	 * this will cause issues related to using freed \a ns in poold
>  	 * thread.
> 
> 
>