unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

rnbd-srv: remove struct rnbd_dev

Browse source 
Given that rnbd_srv_sess_dev already has an open_flags member, there
is no need for the rnbd_dev indirection as a simple block_device pointer
works just as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20220909131509.3263924-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-09-09 15:15:09 +02:00 committed by Jens Axboe
parent 6856b194b2
commit f7de4886fe
3 changed files with 18 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/block/rnbd/rnbd-srv-dev.h
View file

@ -1,20 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* RDMA Network Block Driver
*
* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
*/
#ifndef RNBD_SRV_DEV_H
#define RNBD_SRV_DEV_H
#include <linux/fs.h>
#include "rnbd-proto.h"
struct rnbd_dev {
struct block_device *bdev;
fmode_t blk_open_flags;
};
#endif /* RNBD_SRV_DEV_H */

46
drivers/block/rnbd/rnbd-srv.c
View file

@ -13,7 +13,6 @@
#include <linux/blkdev.h>
#include "rnbd-srv.h"
#include "rnbd-srv-dev.h"
#include "rnbd-srv-trace.h"
MODULE_DESCRIPTION("RDMA Network Block Device Server");
@ -146,7 +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->rnbd_dev->bdev, 1,
bio = bio_alloc(sess_dev->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) {
@ -220,9 +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->rnbd_dev->bdev,
sess_dev->rnbd_dev->blk_open_flags);
kfree(sess_dev->rnbd_dev);
blkdev_put(sess_dev->bdev, sess_dev->open_flags);
mutex_lock(&sess_dev->dev->lock);
list_del(&sess_dev->dev_list);
if (sess_dev->open_flags & FMODE_WRITE)
@ -513,14 +510,14 @@ static int rnbd_srv_check_update_open_perm(struct rnbd_srv_dev *srv_dev,
}
static struct rnbd_srv_dev *
rnbd_srv_get_or_create_srv_dev(struct rnbd_dev *rnbd_dev,
rnbd_srv_get_or_create_srv_dev(struct block_device *bdev,
struct rnbd_srv_session *srv_sess,
enum rnbd_access_mode access_mode)
{
int ret;
struct rnbd_srv_dev *new_dev, *dev;
new_dev = rnbd_srv_init_srv_dev(rnbd_dev->bdev);
new_dev = rnbd_srv_init_srv_dev(bdev);
if (IS_ERR(new_dev))
return new_dev;
@ -540,7 +537,7 @@ rnbd_srv_get_or_create_srv_dev(struct rnbd_dev *rnbd_dev,
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->rnbd_dev->bdev;
struct block_device *bdev = sess_dev->bdev;
rsp->hdr.type = cpu_to_le16(RNBD_MSG_OPEN_RSP);
rsp->device_id = cpu_to_le32(sess_dev->device_id);
@ -565,7 +562,7 @@ 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 rnbd_dev *rnbd_dev, fmode_t open_flags,
struct block_device *bdev, fmode_t open_flags,
struct rnbd_srv_dev *srv_dev)
{
struct rnbd_srv_sess_dev *sdev = rnbd_sess_dev_alloc(srv_sess);
@ -577,7 +574,7 @@ rnbd_srv_create_set_sess_dev(struct rnbd_srv_session *srv_sess,
strscpy(sdev->pathname, open_msg->dev_name, sizeof(sdev->pathname));
sdev->rnbd_dev = rnbd_dev;
sdev->bdev = bdev;
sdev->sess = srv_sess;
sdev->dev = srv_dev;
sdev->open_flags = open_flags;
@ -684,9 +681,9 @@ 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;
fmode_t open_flags;
char *full_path;
struct rnbd_dev *rnbd_dev;
struct rnbd_msg_open_rsp *rsp = data;
trace_process_msg_open(srv_sess, open_msg);
@ -723,33 +720,25 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
goto reject;
}
rnbd_dev = kzalloc(sizeof(*rnbd_dev), GFP_KERNEL);
if (!rnbd_dev) {
ret = -ENOMEM;
goto free_path;
}
rnbd_dev->blk_open_flags = open_flags;
rnbd_dev->bdev = blkdev_get_by_path(full_path, open_flags, THIS_MODULE);
if (IS_ERR(rnbd_dev->bdev)) {
ret = PTR_ERR(rnbd_dev->bdev);
bdev = blkdev_get_by_path(full_path, open_flags, THIS_MODULE);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
pr_err("Opening device '%s' on session %s failed, failed to open the block device, err: %d\n",
full_path, srv_sess->sessname, ret);
kfree(rnbd_dev);
goto free_path;
}
srv_dev = rnbd_srv_get_or_create_srv_dev(rnbd_dev, srv_sess,
srv_dev = rnbd_srv_get_or_create_srv_dev(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",
full_path, srv_sess->sessname, PTR_ERR(srv_dev));
ret = PTR_ERR(srv_dev);
goto rnbd_dev_close;
goto blkdev_put;
}
srv_sess_dev = rnbd_srv_create_set_sess_dev(srv_sess, open_msg,
rnbd_dev, open_flags,
bdev, open_flags,
srv_dev);
if (IS_ERR(srv_sess_dev)) {
pr_err("Opening device '%s' on session %s failed, creating sess_dev failed, err: %ld\n",
@ -764,7 +753,7 @@ 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, rnbd_dev->bdev);
ret = rnbd_srv_create_dev_sysfs(srv_dev, bdev);
if (ret) {
mutex_unlock(&srv_dev->lock);
rnbd_srv_err(srv_sess_dev,
@ -806,9 +795,8 @@ static int process_msg_open(struct rnbd_srv_session *srv_sess,
mutex_unlock(&srv_dev->lock);
}
rnbd_put_srv_dev(srv_dev);
rnbd_dev_close:
blkdev_put(rnbd_dev->bdev, rnbd_dev->blk_open_flags);
kfree(rnbd_dev);
blkdev_put:
blkdev_put(bdev, open_flags);
free_path:
kfree(full_path);
reject:

2
drivers/block/rnbd/rnbd-srv.h
View file

@ -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 rnbd_dev *rnbd_dev;
struct block_device *bdev;
struct rnbd_srv_session *sess;
struct rnbd_srv_dev *dev;
struct kobject kobj;