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

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Date:   Tue, 01 May 2018 13:52:38 +1000
From:   NeilBrown <neilb@...e.com>
To:     Oleg Drokin <oleg.drokin@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Simmons <jsimmons@...radead.org>,
        Andreas Dilger <andreas.dilger@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: [PATCH 01/10] staging: lustre: ldlm: store name directly in
 namespace.

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>
---
 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.