[PATCH 06/29] rnbd-srv: Convert to use bdev_open_by_path()

Jan Kara
2023-08-23T10:49:35Z

Convert rnbd-srv to use bdev_open_by_path() and pass the handle
around.

CC: Jack Wang <jinpu.wang@ionos.com>
CC: "Md. Haris Iqbal" <haris.iqbal@ionos.com>
Acked-by: "Md. Haris Iqbal" <haris.iqbal@ionos.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
drivers/block/rnbd/rnbd-srv.c | 27 ++++++++++++++-------------
drivers/block/rnbd/rnbd-srv.h | 2 +-
2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index c186df0ec641..65de51f3dfd9 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);
+ bdev_release(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 +714,15 @@ 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 = bdev_open_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 +731,8 @@ 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 +748,7 @@ 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 +791,7 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
}
rnbd_put_srv_dev(srv_dev);
blkdev_put:
- blkdev_put(bdev, NULL);
+ bdev_release(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