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WSL2-Linux-Kernel
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ublk_drv: cleanup ublksrv_ctrl_dev_info 

Remove all block device related info from ublksrv_ctrl_dev_info,
meantime reduce its size into 64 bytes because:

1) ublksrv_ctrl_dev_info becomes cleaner without including any
block related info

2) generic set/get parameter command can be used to set block
related setting easily and cleanly

3) generic set/get parameter command can be used for extending
ublk without needing more info in ublksrv_ctrl_dev_info

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220730092750.1118167-5-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2022-07-30 17:27:50 +08:00 коммит произвёл Jens Axboe
Родитель 0aa73170eb
Коммит 4bf9cbf3e9
2 изменённых файлов: 15 добавлений и 18 удалений
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18
drivers/block/ublk_drv.c
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@ -122,7 +122,6 @@ struct ublk_device {
char *__queues;
unsigned short queue_size;
unsigned short bs_shift;
struct ublksrv_ctrl_dev_info dev_info;
struct blk_mq_tag_set tag_set;
@ -223,8 +222,7 @@ static int ublk_validate_params(const struct ublk_device *ub)
if (p->logical_bs_shift > p->physical_bs_shift)
return -EINVAL;
if (p->max_sectors > (ub->dev_info.rq_max_blocks <<
(ub->bs_shift - 9)))
if (p->max_sectors > (ub->dev_info.max_io_buf_bytes >> 9))
return -EINVAL;
} else
return -EINVAL;
@ -1185,13 +1183,13 @@ static void ublk_stop_work_fn(struct work_struct *work)
ublk_stop_dev(ub);
}
/* align maximum I/O size to PAGE_SIZE */
/* align max io buffer size with PAGE_SIZE */
static void ublk_align_max_io_size(struct ublk_device *ub)
{
unsigned int max_rq_bytes = ub->dev_info.rq_max_blocks << ub->bs_shift;
unsigned int max_io_bytes = ub->dev_info.max_io_buf_bytes;
ub->dev_info.rq_max_blocks =
round_down(max_rq_bytes, PAGE_SIZE) >> ub->bs_shift;
ub->dev_info.max_io_buf_bytes =
round_down(max_io_bytes, PAGE_SIZE);
}
static int ublk_add_tag_set(struct ublk_device *ub)
@ -1348,9 +1346,8 @@ static inline void ublk_dump_dev_info(struct ublksrv_ctrl_dev_info *info)
{
pr_devel("%s: dev id %d flags %llx\n", __func__,
info->dev_id, info->flags);
pr_devel("\t nr_hw_queues %d queue_depth %d block size %d dev_capacity %lld\n",
info->nr_hw_queues, info->queue_depth,
info->block_size, info->dev_blocks);
pr_devel("\t nr_hw_queues %d queue_depth %d\n",
info->nr_hw_queues, info->queue_depth);
}
static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd)
@ -1410,7 +1407,6 @@ static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd)
/* We are not ready to support zero copy */
ub->dev_info.flags &= ~UBLK_F_SUPPORT_ZERO_COPY;
ub->bs_shift = ilog2(ub->dev_info.block_size);
ub->dev_info.nr_hw_queues = min_t(unsigned int,
ub->dev_info.nr_hw_queues, nr_cpu_ids);
ublk_align_max_io_size(ub);

15
include/uapi/linux/ublk_cmd.h
Просмотреть файл

@ -80,22 +80,23 @@ struct ublksrv_ctrl_cmd {
struct ublksrv_ctrl_dev_info {
__u16 nr_hw_queues;
__u16 queue_depth;
__u16 block_size;
__u16 state;
__u16 pad0;
__u32 rq_max_blocks;
__u32 max_io_buf_bytes;
__u32 dev_id;
__u64 dev_blocks;
__s32 ublksrv_pid;
__s32 reserved0;
__u32 pad1;
__u64 flags;
__u64 flags_reserved;
/* For ublksrv internal use, invisible to ublk driver */
__u64 ublksrv_flags;
__u64 reserved1[9];
__u64 reserved0;
__u64 reserved1;
__u64 reserved2;
};
#define UBLK_IO_OP_READ 0