zfs/include/splat-ctl.h

#ifndef _SPLAT_CTL_H
#define _SPLAT_CTL_H

/* Contains shared definitions which both the userspace
 * and kernelspace portions of splat must agree on.
 */

#define SPLAT_MAJOR			229 /* XXX - Arbitrary */
#define SPLAT_MINORS                    1
#define SPLAT_DEV			"/dev/splatctl"

#define SPLAT_NAME_SIZE			12
#define SPLAT_DESC_SIZE			60

typedef struct splat_user {
	char name[SPLAT_NAME_SIZE];	/* short name */
	char desc[SPLAT_DESC_SIZE];	/* short description */
	int id;				/* unique numeric id */
} splat_user_t;

#define	SPLAT_CFG_MAGIC			0x15263748U
typedef struct splat_cfg {
	unsigned int cfg_magic;		/* Unique magic */
	int cfg_cmd;			/* Config command */
	int cfg_arg1;			/* Config command arg 1 */
	int cfg_rc1;			/* Config response 1 */
	union {
		struct {
			int size;
			splat_user_t descs[0];
		} splat_subsystems;
		struct {
			int size;
			splat_user_t descs[0];
		} splat_tests;
	} cfg_data;
} splat_cfg_t;

#define	SPLAT_CMD_MAGIC			0x9daebfc0U
typedef struct splat_cmd {
	unsigned int cmd_magic;		/* Unique magic */
	int cmd_subsystem;		/* Target subsystem */
	int cmd_test;			/* Subsystem test */
	int cmd_data_size;		/* Extra opaque data */
	char cmd_data_str[0];		/* Opaque data region */
} splat_cmd_t;

/* Valid ioctls */
#define SPLAT_CFG				_IOWR('f', 101, long)
#define SPLAT_CMD				_IOWR('f', 102, long)

/* Valid configuration commands */
#define SPLAT_CFG_BUFFER_CLEAR		0x001	/* Clear text buffer */
#define SPLAT_CFG_BUFFER_SIZE		0x002	/* Resize text buffer */
#define SPLAT_CFG_SUBSYSTEM_COUNT	0x101	/* Number of subsystem */
#define SPLAT_CFG_SUBSYSTEM_LIST	0x102	/* List of N subsystems */
#define SPLAT_CFG_TEST_COUNT		0x201	/* Number of tests */
#define SPLAT_CFG_TEST_LIST		0x202	/* List of N tests */

/* Valid subsystem and test commands defined in each subsystem, we do
 * need to be careful to avoid colisions.  That alone may argue to define
 * them all here, for now we just define the global error codes.
 */
#define SPLAT_SUBSYSTEM_UNKNOWN		0xF00
#define SPLAT_TEST_UNKNOWN		0xFFF

#endif /* _SPLAT_CTL_H */