ksmbd: Convert to use sysfs_emit()/sysfs_emit_at() APIs

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/ksmbd/server.c

@@ -432,11 +432,9 @@ static ssize_t stats_show(struct class *class, struct class_attribute *attr,
 		"reset",
 		"shutdown"
 	};
-
-	ssize_t sz = scnprintf(buf, PAGE_SIZE, "%d %s %d %lu\n", stats_version,
-			       state[server_conf.state], server_conf.tcp_port,
-			       server_conf.ipc_last_active / HZ);
-	return sz;
+	return sysfs_emit(buf, "%d %s %d %lu\n", stats_version,
+			  state[server_conf.state], server_conf.tcp_port,
+			  server_conf.ipc_last_active / HZ);
 }
 
 static ssize_t kill_server_store(struct class *class,
@@ -468,19 +466,13 @@ static ssize_t debug_show(struct class *class, struct class_attribute *attr,
 
 	for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
 		if ((ksmbd_debug_types >> i) & 1) {
-			pos = scnprintf(buf + sz,
-					PAGE_SIZE - sz,
-					"[%s] ",
-					debug_type_strings[i]);
+			pos = sysfs_emit_at(buf, sz, "[%s] ", debug_type_strings[i]);
 		} else {
-			pos = scnprintf(buf + sz,
-					PAGE_SIZE - sz,
-					"%s ",
-					debug_type_strings[i]);
+			pos = sysfs_emit_at(buf, sz, "%s ", debug_type_strings[i]);
 		}
 		sz += pos;
 	}
-	sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n");
+	sz += sysfs_emit_at(buf, sz, "\n");
 	return sz;
 }