rnbd-srv: replace sess->open_flags with a "bool readonly"

Stop passing the fmode_t around and just use a simple bool to track if
an export is read-only.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20230608110258.189493-24-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-srv-sysfs.c

@@ -87,8 +87,7 @@ static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
 
 	sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
 
-	return sysfs_emit(page, "%d\n",
-			  !(sess_dev->open_flags & FMODE_WRITE));
+	return sysfs_emit(page, "%d\n", sess_dev->readonly);
 }
 
 static struct kobj_attribute rnbd_srv_dev_session_ro_attr =

drivers/block/rnbd/rnbd-srv.c

@@ -222,7 +222,7 @@ void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id)
 	blkdev_put(sess_dev->bdev, NULL);
 	mutex_lock(&sess_dev->dev->lock);
 	list_del(&sess_dev->dev_list);
-	if (sess_dev->open_flags & FMODE_WRITE)
+	if (!sess_dev->readonly)
 		sess_dev->dev->open_write_cnt--;
 	mutex_unlock(&sess_dev->dev->lock);
 
@@ -559,7 +559,7 @@ static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp,
 static struct rnbd_srv_sess_dev *
 rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess,
 			      const struct rnbd_msg_open *open_msg,
-			      struct block_device *bdev, fmode_t open_flags,
+			      struct block_device *bdev, bool readonly,
 			      struct rnbd_srv_dev *srv_dev)
 {
 	struct rnbd_srv_sess_dev *sdev = rnbd_sess_dev_alloc(srv_sess);
@@ -574,7 +574,7 @@ rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess,
 	sdev->bdev		= bdev;
 	sdev->sess		= srv_sess;
 	sdev->dev		= srv_dev;
-	sdev->open_flags	= open_flags;
+	sdev->readonly		= readonly;
 	sdev->access_mode	= open_msg->access_mode;
 
 	return sdev;
@@ -677,13 +677,12 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
 	struct rnbd_srv_sess_dev *srv_sess_dev;
 	const struct rnbd_msg_open *open_msg = msg;
 	struct block_device *bdev;
-	fmode_t open_flags;
+	fmode_t open_flags = FMODE_READ;
 	char *full_path;
 	struct rnbd_msg_open_rsp *rsp = data;
 
 	trace_process_msg_open(srv_sess, open_msg);
 
-	open_flags = FMODE_READ;
 	if (open_msg->access_mode != RNBD_ACCESS_RO)
 		open_flags |= FMODE_WRITE;
 
@@ -732,9 +731,9 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
 		goto blkdev_put;
 	}
 
-	srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg,
-						     bdev, open_flags,
-						     srv_dev);
+	srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg, bdev,
+				open_msg->access_mode == RNBD_ACCESS_RO,
+				srv_dev);
 	if (IS_ERR(srv_sess_dev)) {
 		pr_err("Opening device '%s' on session %s failed, creating sess_dev failed, err: %ld\n",
 		       full_path, srv_sess->sessname, PTR_ERR(srv_sess_dev));

drivers/block/rnbd/rnbd-srv.h

@@ -52,7 +52,7 @@ struct rnbd_srv_sess_dev {
 	struct kobject                  kobj;
 	u32                             device_id;
 	bool				keep_id;
-	fmode_t                         open_flags;
+	bool				readonly;
 	struct kref			kref;
 	struct completion               *destroy_comp;
 	char				pathname[NAME_MAX];