staging/lustre/ldlm: move cancel_unused_locks_before_replay to sysfs

/proc/fs/lustre/ldlm/cancel_unused_locks_before_replay is
moved to /sys/fs/lustre/ldlm/cancel_unused_locks_before_replay
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c

@@ -1006,8 +1006,35 @@ void ldlm_destroy_export(struct obd_export *exp)
 }
 EXPORT_SYMBOL(ldlm_destroy_export);
 
+extern unsigned int ldlm_cancel_unused_locks_before_replay;
+
+static ssize_t cancel_unused_locks_before_replay_show(struct kobject *kobj,
+						      struct attribute *attr,
+						      char *buf)
+{
+	return sprintf(buf, "%d\n", ldlm_cancel_unused_locks_before_replay);
+}
+static ssize_t cancel_unused_locks_before_replay_store(struct kobject *kobj,
+						       struct attribute *attr,
+						       const char *buffer,
+						       size_t count)
+{
+	int rc;
+	unsigned long val;
+
+	rc = kstrtoul(buffer, 10, &val);
+	if (rc)
+		return rc;
+
+	ldlm_cancel_unused_locks_before_replay = val;
+
+	return count;
+}
+LUSTRE_RW_ATTR(cancel_unused_locks_before_replay);
+
 /* These are for root of /sys/fs/lustre/ldlm */
-struct attribute *ldlm_attrs[] = {
+static struct attribute *ldlm_attrs[] = {
+	&lustre_attr_cancel_unused_locks_before_replay.attr,
 	NULL,
 };
 

drivers/staging/lustre/lustre/ldlm/ldlm_resource.c

@@ -65,8 +65,6 @@ struct proc_dir_entry *ldlm_type_proc_dir = NULL;
 static struct proc_dir_entry *ldlm_ns_proc_dir = NULL;
 struct proc_dir_entry *ldlm_svc_proc_dir = NULL;
 
-extern unsigned int ldlm_cancel_unused_locks_before_replay;
-
 /* during debug dump certain amount of granted locks for one resource to avoid
  * DDOS. */
 unsigned int ldlm_dump_granted_max = 256;
@@ -91,8 +89,6 @@ int ldlm_proc_setup(void)
 		{ "dump_namespaces", &ldlm_dump_ns_fops, NULL, 0222 },
 		{ "dump_granted_max", &ldlm_rw_uint_fops,
 		  &ldlm_dump_granted_max },
-		{ "cancel_unused_locks_before_replay", &ldlm_rw_uint_fops,
-		  &ldlm_cancel_unused_locks_before_replay },
 		{ NULL } };
 	LASSERT(ldlm_ns_proc_dir == NULL);
 

drivers/staging/lustre/sysfs-fs-lustre

@@ -190,3 +190,13 @@ Contact:	"Oleg Drokin" <oleg.drokin@intel.com>
 Description:
 		Controls extended attributes client-side cache.
 		1 to enable, 0 to disable.
+
+What:		/sys/fs/lustre/ldlm/cancel_unused_locks_before_replay
+Date:		May 2015
+Contact:	"Oleg Drokin" <oleg.drokin@intel.com>
+Description:
+		Controls if client should replay unused locks during recovery
+		If a client tends to have a lot of unused locks in LRU,
+		recovery times might become prolonged.
+		1 - just locally cancel unused locks (default)
+		0 - replay unused locks.