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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __BLOCK_H
#define __BLOCK_H
#include <driver.h>
#include <linux/list.h>
#include <linux/types.h>
struct block_device;
struct file_list;
struct block_device_ops {
int (*read)(struct block_device *, void *buf, sector_t block, blkcnt_t num_blocks);
int (*write)(struct block_device *, const void *buf, sector_t block, blkcnt_t num_blocks);
int (*flush)(struct block_device *);
};
struct chunk;
enum blk_type {
BLK_TYPE_UNSPEC = 0,
BLK_TYPE_USB,
BLK_TYPE_SD,
BLK_TYPE_AHCI,
BLK_TYPE_IDE,
BLK_TYPE_NVME,
BLK_TYPE_VIRTUAL,
BLK_TYPE_MMC,
};
const char *blk_type_str(enum blk_type);
struct block_device {
struct device *dev;
struct list_head list;
struct block_device_ops *ops;
u8 blockbits;
u8 type; /* holds enum blk_type */
blkcnt_t num_blocks;
int rdbufsize;
int blkmask;
sector_t discard_start;
blkcnt_t discard_size;
struct list_head buffered_blocks;
struct list_head idle_blocks;
struct cdev cdev;
bool need_reparse;
};
#define BLOCKSIZE(blk) (1u << (blk)->blockbits)
extern struct list_head block_device_list;
#define for_each_block_device(bdev) list_for_each_entry(bdev, &block_device_list, list)
int blockdevice_register(struct block_device *blk);
int blockdevice_unregister(struct block_device *blk);
int block_read(struct block_device *blk, void *buf, sector_t block, blkcnt_t num_blocks);
int block_write(struct block_device *blk, void *buf, sector_t block, blkcnt_t num_blocks);
static inline int block_flush(struct block_device *blk)
{
return cdev_flush(&blk->cdev);
}
#ifdef CONFIG_BLOCK
struct block_device *cdev_get_block_device(const struct cdev *cdev);
unsigned file_list_add_blockdevs(struct file_list *files);
#else
static inline struct block_device *cdev_get_block_device(const struct cdev *cdev)
{
return NULL;
}
static inline unsigned file_list_add_blockdevs(struct file_list *files)
{
return 0;
}
#endif
static inline bool cdev_is_block_device(const struct cdev *cdev)
{
return cdev_get_block_device(cdev) != NULL;
}
static inline bool cdev_is_block_partition(const struct cdev *cdev)
{
return cdev_is_block_device(cdev) && cdev_is_partition(cdev);
}
static inline bool cdev_is_block_disk(const struct cdev *cdev)
{
return cdev_is_block_device(cdev) && !cdev_is_partition(cdev);
}
#endif /* __BLOCK_H */
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