dev.h

#ifndef __KERN_FS_DEVS_DEV_H__
#define __KERN_FS_DEVS_DEV_H__

#include <defs.h>

struct inode;
struct iobuf;

/*
 * Filesystem-namespace-accessible device.
 * d_io is for both reads and writes; the iobuf will indicates the direction.
 */
struct device {
    size_t d_blocks;
    size_t d_blocksize;
    int (*d_open)(struct device *dev, uint32_t open_flags);
    int (*d_close)(struct device *dev);
    int (*d_io)(struct device *dev, struct iobuf *iob, bool write);
    int (*d_ioctl)(struct device *dev, int op, void *data);
};

#define dop_open(dev, open_flags)           ((dev)->d_open(dev, open_flags))
#define dop_close(dev)                      ((dev)->d_close(dev))
#define dop_io(dev, iob, write)             ((dev)->d_io(dev, iob, write))
#define dop_ioctl(dev, op, data)            ((dev)->d_ioctl(dev, op, data))

void dev_init(void);
struct inode *dev_create_inode(void);

#endif /* !__KERN_FS_DEVS_DEV_H__ */