mirror of
https://github.com/torvalds/linux.git
synced 2024-12-12 06:02:38 +00:00
d7aaeef293
Since we always set bi_end_io after call rnbd_bio_map_kern, so the setting in rnbd_bio_map_kern is redundant. Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Acked-by: Danil Kipnis <danil.kipnis@cloud.ionos.com> Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
// 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.
|
|
*/
|
|
#undef pr_fmt
|
|
#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
|
|
|
|
#include "rnbd-srv-dev.h"
|
|
#include "rnbd-log.h"
|
|
|
|
struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
|
|
struct bio_set *bs)
|
|
{
|
|
struct rnbd_dev *dev;
|
|
int ret;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
dev->blk_open_flags = flags;
|
|
dev->bdev = blkdev_get_by_path(path, flags, THIS_MODULE);
|
|
ret = PTR_ERR_OR_ZERO(dev->bdev);
|
|
if (ret)
|
|
goto err;
|
|
|
|
dev->blk_open_flags = flags;
|
|
bdevname(dev->bdev, dev->name);
|
|
dev->ibd_bio_set = bs;
|
|
|
|
return dev;
|
|
|
|
err:
|
|
kfree(dev);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
void rnbd_dev_close(struct rnbd_dev *dev)
|
|
{
|
|
blkdev_put(dev->bdev, dev->blk_open_flags);
|
|
kfree(dev);
|
|
}
|
|
|
|
void rnbd_dev_bi_end_io(struct bio *bio)
|
|
{
|
|
struct rnbd_dev_blk_io *io = bio->bi_private;
|
|
|
|
rnbd_endio(io->priv, blk_status_to_errno(bio->bi_status));
|
|
bio_put(bio);
|
|
}
|
|
|
|
/**
|
|
* rnbd_bio_map_kern - map kernel address into bio
|
|
* @data: pointer to buffer to map
|
|
* @bs: bio_set to use.
|
|
* @len: length in bytes
|
|
* @gfp_mask: allocation flags for bio allocation
|
|
*
|
|
* Map the kernel address into a bio suitable for io to a block
|
|
* device. Returns an error pointer in case of error.
|
|
*/
|
|
struct bio *rnbd_bio_map_kern(void *data, struct bio_set *bs,
|
|
unsigned int len, gfp_t gfp_mask)
|
|
{
|
|
unsigned long kaddr = (unsigned long)data;
|
|
unsigned long end = (kaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
unsigned long start = kaddr >> PAGE_SHIFT;
|
|
const int nr_pages = end - start;
|
|
int offset, i;
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc_bioset(gfp_mask, nr_pages, bs);
|
|
if (!bio)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
offset = offset_in_page(kaddr);
|
|
for (i = 0; i < nr_pages; i++) {
|
|
unsigned int bytes = PAGE_SIZE - offset;
|
|
|
|
if (len <= 0)
|
|
break;
|
|
|
|
if (bytes > len)
|
|
bytes = len;
|
|
|
|
if (bio_add_page(bio, virt_to_page(data), bytes,
|
|
offset) < bytes) {
|
|
/* we don't support partial mappings */
|
|
bio_put(bio);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
data += bytes;
|
|
len -= bytes;
|
|
offset = 0;
|
|
}
|
|
|
|
return bio;
|
|
}
|