staging/lustre/ptlrpc: move procfs threads* files to sysfs

Move ptlrpc service threads_min, threads_max and threads_running
entries from procfs to sysfs.
Currently in use only by ldlm callback service only in
/sys/fs/lustre/ldlm/services/ldlm_cbd/
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ptlrpc/lproc_ptlrpc.c

@@ -324,23 +324,23 @@ ptlrpc_lprocfs_req_history_max_seq_write(struct file *file,
 }
 LPROC_SEQ_FOPS(ptlrpc_lprocfs_req_history_max);
 
-static int
-ptlrpc_lprocfs_threads_min_seq_show(struct seq_file *m, void *n)
+
+static ssize_t threads_min_show(struct kobject *kobj, struct attribute *attr,
+				char *buf)
 {
-	struct ptlrpc_service *svc = m->private;
+	struct ptlrpc_service *svc = container_of(kobj, struct ptlrpc_service,
+						  srv_kobj);
 
-	seq_printf(m, "%d\n", svc->srv_nthrs_cpt_init * svc->srv_ncpts);
-	return 0;
+	return sprintf(buf, "%d\n", svc->srv_nthrs_cpt_init * svc->srv_ncpts);
 }
 
-static ssize_t
-ptlrpc_lprocfs_threads_min_seq_write(struct file *file,
-					const char __user *buffer,
-					size_t count, loff_t *off)
+static ssize_t threads_min_store(struct kobject *kobj, struct attribute *attr,
+				 const char *buffer, size_t count)
 {
-	struct ptlrpc_service *svc = ((struct seq_file *)file->private_data)->private;
-	int	val;
-	int	rc = lprocfs_write_helper(buffer, count, &val);
+	struct ptlrpc_service *svc = container_of(kobj, struct ptlrpc_service,
+						  srv_kobj);
+	unsigned long val;
+	int rc = kstrtoul(buffer, 10, &val);
 
 	if (rc < 0)
 		return rc;
@@ -360,41 +360,41 @@ ptlrpc_lprocfs_threads_min_seq_write(struct file *file,
 
 	return count;
 }
-LPROC_SEQ_FOPS(ptlrpc_lprocfs_threads_min);
+LUSTRE_RW_ATTR(threads_min);
 
-static int
-ptlrpc_lprocfs_threads_started_seq_show(struct seq_file *m, void *n)
+static ssize_t threads_started_show(struct kobject *kobj,
+				    struct attribute *attr,
+				    char *buf)
 {
-	struct ptlrpc_service *svc = m->private;
+	struct ptlrpc_service *svc = container_of(kobj, struct ptlrpc_service,
+						  srv_kobj);
 	struct ptlrpc_service_part *svcpt;
-	int	total = 0;
-	int	i;
+	int total = 0;
+	int i;
 
 	ptlrpc_service_for_each_part(svcpt, i, svc)
 		total += svcpt->scp_nthrs_running;
 
-	seq_printf(m, "%d\n", total);
-	return 0;
+	return sprintf(buf, "%d\n", total);
 }
-LPROC_SEQ_FOPS_RO(ptlrpc_lprocfs_threads_started);
+LUSTRE_RO_ATTR(threads_started);
 
-static int
-ptlrpc_lprocfs_threads_max_seq_show(struct seq_file *m, void *n)
+static ssize_t threads_max_show(struct kobject *kobj, struct attribute *attr,
+				char *buf)
 {
-	struct ptlrpc_service *svc = m->private;
+	struct ptlrpc_service *svc = container_of(kobj, struct ptlrpc_service,
+						  srv_kobj);
 
-	seq_printf(m, "%d\n", svc->srv_nthrs_cpt_limit * svc->srv_ncpts);
-	return 0;
+	return sprintf(buf, "%d\n", svc->srv_nthrs_cpt_limit * svc->srv_ncpts);
 }
 
-static ssize_t
-ptlrpc_lprocfs_threads_max_seq_write(struct file *file,
-				const char __user *buffer,
-				size_t count, loff_t *off)
+static ssize_t threads_max_store(struct kobject *kobj, struct attribute *attr,
+				 const char *buffer, size_t count)
 {
-	struct ptlrpc_service *svc = ((struct seq_file *)file->private_data)->private;
-	int	val;
-	int	rc = lprocfs_write_helper(buffer, count, &val);
+	struct ptlrpc_service *svc = container_of(kobj, struct ptlrpc_service,
+						  srv_kobj);
+	unsigned long val;
+	int rc = kstrtoul(buffer, 10, &val);
 
 	if (rc < 0)
 		return rc;
@@ -414,7 +414,7 @@ ptlrpc_lprocfs_threads_max_seq_write(struct file *file,
 
 	return count;
 }
-LPROC_SEQ_FOPS(ptlrpc_lprocfs_threads_max);
+LUSTRE_RW_ATTR(threads_max);
 
 /**
  * \addtogoup nrs
@@ -1050,6 +1050,9 @@ static ssize_t ptlrpc_lprocfs_hp_ratio_seq_write(struct file *file,
 LPROC_SEQ_FOPS(ptlrpc_lprocfs_hp_ratio);
 
 static struct attribute *ptlrpc_svc_attrs[] = {
+	&lustre_attr_threads_min.attr,
+	&lustre_attr_threads_started.attr,
+	&lustre_attr_threads_max.attr,
 	NULL,
 };
 
@@ -1102,15 +1105,6 @@ void ptlrpc_lprocfs_register_service(struct proc_dir_entry *entry,
 		{.name       = "req_buffer_history_max",
 		 .fops	     = &ptlrpc_lprocfs_req_history_max_fops,
 		 .data       = svc},
-		{.name       = "threads_min",
-		 .fops	     = &ptlrpc_lprocfs_threads_min_fops,
-		 .data       = svc},
-		{.name       = "threads_max",
-		 .fops	     = &ptlrpc_lprocfs_threads_max_fops,
-		 .data       = svc},
-		{.name       = "threads_started",
-		 .fops	     = &ptlrpc_lprocfs_threads_started_fops,
-		 .data       = svc},
 		{.name       = "timeouts",
 		 .fops	     = &ptlrpc_lprocfs_timeouts_fops,
 		 .data       = svc},

drivers/staging/lustre/sysfs-fs-lustre

@@ -311,3 +311,21 @@ Contact:	"Oleg Drokin" <oleg.drokin@intel.com>
 Description:
 		Controls length of time between recalculation of above
 		values (in seconds).
+
+What:		/sys/fs/lustre/ldlm/services/ldlm_cbd/threads_min
+Date:		May 2015
+Contact:	"Oleg Drokin" <oleg.drokin@intel.com>
+Description:
+		Controls minimum number of ldlm callback threads to start.
+
+What:		/sys/fs/lustre/ldlm/services/ldlm_cbd/threads_max
+Date:		May 2015
+Contact:	"Oleg Drokin" <oleg.drokin@intel.com>
+Description:
+		Controls maximum number of ldlm callback threads to start.
+
+What:		/sys/fs/lustre/ldlm/services/ldlm_cbd/threads_started
+Date:		May 2015
+Contact:	"Oleg Drokin" <oleg.drokin@intel.com>
+Description:
+		Shows actual number of ldlm callback threads running.