On Tue, Jul 4, 2023 at 2:22 PM Jan Kara <jack@xxxxxxx> wrote:
>
> Convert rnbd-srv to use blkdev_get_handle_by_path() and pass the handle
> around.
>
> CC: Jack Wang <jinpu.wang@xxxxxxxxx>
> CC: "Md. Haris Iqbal" <haris.iqbal@xxxxxxxxx>
> Signed-off-by: Jan Kara <jack@xxxxxxx>
Acked-by: "Md. Haris Iqbal" <haris.iqbal@xxxxxxxxx>
Thanks
> ---
> drivers/block/rnbd/rnbd-srv.c | 28 +++++++++++++++-------------
> drivers/block/rnbd/rnbd-srv.h | 2 +-
> 2 files changed, 16 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
> index c186df0ec641..606db77c1238 100644
> --- a/drivers/block/rnbd/rnbd-srv.c
> +++ b/drivers/block/rnbd/rnbd-srv.c
> @@ -145,7 +145,7 @@ static int process_rdma(struct rnbd_srv_session *srv_sess,
> priv->sess_dev = sess_dev;
> priv->id = id;
>
> - bio = bio_alloc(sess_dev->bdev, 1,
> + bio = bio_alloc(sess_dev->bdev_handle->bdev, 1,
> rnbd_to_bio_flags(le32_to_cpu(msg->rw)), GFP_KERNEL);
> if (bio_add_page(bio, virt_to_page(data), datalen,
> offset_in_page(data)) != datalen) {
> @@ -219,7 +219,7 @@ void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id)
> rnbd_put_sess_dev(sess_dev);
> wait_for_completion(&dc); /* wait for inflights to drop to zero */
>
> - blkdev_put(sess_dev->bdev, NULL);
> + blkdev_handle_put(sess_dev->bdev_handle);
> mutex_lock(&sess_dev->dev->lock);
> list_del(&sess_dev->dev_list);
> if (!sess_dev->readonly)
> @@ -534,7 +534,7 @@ rnbd_srv_get_or_create_srv_dev(struct block_device *bdev,
> static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp,
> struct rnbd_srv_sess_dev *sess_dev)
> {
> - struct block_device *bdev = sess_dev->bdev;
> + struct block_device *bdev = sess_dev->bdev_handle->bdev;
>
> rsp->hdr.type = cpu_to_le16(RNBD_MSG_OPEN_RSP);
> rsp->device_id = cpu_to_le32(sess_dev->device_id);
> @@ -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, bool readonly,
> + struct bdev_handle *handle, bool readonly,
> struct rnbd_srv_dev *srv_dev)
> {
> struct rnbd_srv_sess_dev *sdev = rnbd_sess_dev_alloc(srv_sess);
> @@ -571,7 +571,7 @@ rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess,
>
> strscpy(sdev->pathname, open_msg->dev_name, sizeof(sdev->pathname));
>
> - sdev->bdev = bdev;
> + sdev->bdev_handle = handle;
> sdev->sess = srv_sess;
> sdev->dev = srv_dev;
> sdev->readonly = readonly;
> @@ -676,7 +676,7 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
> struct rnbd_srv_dev *srv_dev;
> struct rnbd_srv_sess_dev *srv_sess_dev;
> const struct rnbd_msg_open *open_msg = msg;
> - struct block_device *bdev;
> + struct bdev_handle *bdev_handle;
> blk_mode_t open_flags = BLK_OPEN_READ;
> char *full_path;
> struct rnbd_msg_open_rsp *rsp = data;
> @@ -714,15 +714,16 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
> goto reject;
> }
>
> - bdev = blkdev_get_by_path(full_path, open_flags, NULL, NULL);
> - if (IS_ERR(bdev)) {
> - ret = PTR_ERR(bdev);
> + bdev_handle = blkdev_get_handle_by_path(full_path, open_flags, NULL,
> + NULL);
> + if (IS_ERR(bdev_handle)) {
> + ret = PTR_ERR(bdev_handle);
> pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %d\n",
> full_path, srv_sess->sessname, ret);
> goto free_path;
> }
>
> - srv_dev = rnbd_srv_get_or_create_srv_dev(bdev, srv_sess,
> + srv_dev = rnbd_srv_get_or_create_srv_dev(bdev_handle->bdev, srv_sess,
> open_msg->access_mode);
> if (IS_ERR(srv_dev)) {
> pr_err("Opening device '%s' on session %s failed, creating srv_dev failed, err: %ld\n",
> @@ -731,7 +732,8 @@ 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,
> + srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg,
> + bdev_handle,
> open_msg->access_mode == RNBD_ACCESS_RO,
> srv_dev);
> if (IS_ERR(srv_sess_dev)) {
> @@ -747,7 +749,7 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
> */
> mutex_lock(&srv_dev->lock);
> if (!srv_dev->dev_kobj.state_in_sysfs) {
> - ret = rnbd_srv_create_dev_sysfs(srv_dev, bdev);
> + ret = rnbd_srv_create_dev_sysfs(srv_dev, bdev_handle->bdev);
> if (ret) {
> mutex_unlock(&srv_dev->lock);
> rnbd_srv_err(srv_sess_dev,
> @@ -790,7 +792,7 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
> }
> rnbd_put_srv_dev(srv_dev);
> blkdev_put:
> - blkdev_put(bdev, NULL);
> + blkdev_handle_put(bdev_handle);
> free_path:
> kfree(full_path);
> reject:
> diff --git a/drivers/block/rnbd/rnbd-srv.h b/drivers/block/rnbd/rnbd-srv.h
> index 1027656dedb0..343cc682b617 100644
> --- a/drivers/block/rnbd/rnbd-srv.h
> +++ b/drivers/block/rnbd/rnbd-srv.h
> @@ -46,7 +46,7 @@ struct rnbd_srv_dev {
> struct rnbd_srv_sess_dev {
> /* Entry inside rnbd_srv_dev struct */
> struct list_head dev_list;
> - struct block_device *bdev;
> + struct bdev_handle *bdev_handle;
> struct rnbd_srv_session *sess;
> struct rnbd_srv_dev *dev;
> struct kobject kobj;
> --
> 2.35.3
>
