linux-kernel - Re: [PATCH 01/10] staging: lustre: ldlm: store name directly in namespace.

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Date:   Tue, 1 May 2018 04:04:24 +0000
From:   "Dilger, Andreas" <andreas.dilger@...el.com>
To:     NeilBrown <neilb@...e.com>
CC:     "Drokin, Oleg" <oleg.drokin@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Simmons <jsimmons@...radead.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 01/10] staging: lustre: ldlm: store name directly in
 namespace.

On Apr 30, 2018, at 21:52, NeilBrown <neilb@...e.com> wrote:
> 
> 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@...e.com>

Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>

> ---
> 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.
> 
> 

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation