block: rbd: convert to use BUS_ATTR_WO and RO

We are trying to get rid of BUS_ATTR() and the usage of that in rbd.c
can be trivially converted to use BUS_ATTR_WO and RO, so use those
macros instead.

Cc: Sage Weil <sage@redhat.com>
Cc: Alex Elder <elder@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/block/rbd.c

@@ -428,13 +428,12 @@ static bool single_major = true;
 module_param(single_major, bool, 0444);
 MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)");
 
-static ssize_t rbd_add(struct bus_type *bus, const char *buf,
+static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count);
+static ssize_t remove_store(struct bus_type *bus, const char *buf,
 			    size_t count);
-static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
+static ssize_t add_single_major_store(struct bus_type *bus, const char *buf,
 				      size_t count);
-static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf,
-				    size_t count);
-static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf,
+static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf,
 					 size_t count);
 static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth);
 
@@ -464,16 +463,16 @@ static bool rbd_is_lock_owner(struct rbd_device *rbd_dev)
 	return is_lock_owner;
 }
 
-static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf)
+static ssize_t supported_features_show(struct bus_type *bus, char *buf)
 {
 	return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED);
 }
 
-static BUS_ATTR(add, 0200, NULL, rbd_add);
-static BUS_ATTR(remove, 0200, NULL, rbd_remove);
-static BUS_ATTR(add_single_major, 0200, NULL, rbd_add_single_major);
-static BUS_ATTR(remove_single_major, 0200, NULL, rbd_remove_single_major);
-static BUS_ATTR(supported_features, 0444, rbd_supported_features_show, NULL);
+static BUS_ATTR_WO(add);
+static BUS_ATTR_WO(remove);
+static BUS_ATTR_WO(add_single_major);
+static BUS_ATTR_WO(remove_single_major);
+static BUS_ATTR_RO(supported_features);
 
 static struct attribute *rbd_bus_attrs[] = {
 	&bus_attr_add.attr,
@@ -5934,9 +5933,7 @@ static ssize_t do_rbd_add(struct bus_type *bus,
 	goto out;
 }
 
-static ssize_t rbd_add(struct bus_type *bus,
-		       const char *buf,
-		       size_t count)
+static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count)
 {
 	if (single_major)
 		return -EINVAL;
@@ -5944,8 +5941,7 @@ static ssize_t rbd_add(struct bus_type *bus,
 	return do_rbd_add(bus, buf, count);
 }
 
-static ssize_t rbd_add_single_major(struct bus_type *bus,
-				    const char *buf,
+static ssize_t add_single_major_store(struct bus_type *bus, const char *buf,
 				      size_t count)
 {
 	return do_rbd_add(bus, buf, count);
@@ -6049,9 +6045,7 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
 	return count;
 }
 
-static ssize_t rbd_remove(struct bus_type *bus,
-			  const char *buf,
-			  size_t count)
+static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count)
 {
 	if (single_major)
 		return -EINVAL;
@@ -6059,8 +6053,7 @@ static ssize_t rbd_remove(struct bus_type *bus,
 	return do_rbd_remove(bus, buf, count);
 }
 
-static ssize_t rbd_remove_single_major(struct bus_type *bus,
-				       const char *buf,
+static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf,
 					 size_t count)
 {
 	return do_rbd_remove(bus, buf, count);