#ifndef __ZEV_H__
#define __ZEV_H__

#include <sys/types.h>

#ifdef _KERNEL
#include <sys/dmu_objset.h>
#include <sys/dsl_dataset.h>
#include <sys/zfs_vfsops.h>
#include <sys/dsl_dir.h>
#include <sys/spa_impl.h>
#endif

#define ZEVIOC				  ('z' << 8)
#define ZEV_IOC_GET_STATISTICS		  (ZEVIOC | 1)	/* get zev statistics */
#define ZEV_IOC_MUTE_POOL		  (ZEVIOC | 2)	/* no events for pool */
#define ZEV_IOC_UNMUTE_POOL		  (ZEVIOC | 3)	/* send pool events */
#define ZEV_IOC_SET_MAX_QUEUE_LEN	  (ZEVIOC | 4)	/* when to block ops */
#define ZEV_IOC_SET_POLL_WAKEUP_QUEUE_LEN (ZEVIOC | 5)	/* poll throttle */

#define ZEV_OP_MIN			 1
#define ZEV_OP_ERROR			 1
#define	ZEV_OP_ZFS_MOUNT		 2
#define	ZEV_OP_ZFS_UMOUNT		 3
#define	ZEV_OP_ZVOL_WRITE		 4
#define	ZEV_OP_ZVOL_TRUNCATE		 5
#define	ZEV_OP_ZNODE_CLOSE_AFTER_UPDATE	 6
#define	ZEV_OP_ZNODE_CREATE		 7
#define	ZEV_OP_ZNODE_MKDIR		 8
#define	ZEV_OP_ZNODE_MAKE_XATTR_DIR	 9
#define	ZEV_OP_ZNODE_REMOVE		10
#define	ZEV_OP_ZNODE_RMDIR		11
#define	ZEV_OP_ZNODE_LINK		12
#define	ZEV_OP_ZNODE_SYMLINK		13
#define	ZEV_OP_ZNODE_RENAME		14
#define	ZEV_OP_ZNODE_WRITE		15
#define	ZEV_OP_ZNODE_TRUNCATE		16
#define	ZEV_OP_ZNODE_SETATTR		17
#define	ZEV_OP_ZNODE_ACL		18
#define	ZEV_OP_MAX			18

/* zfs event records (as they are represented through the character device) */

typedef struct zev_inode_info_t {
	uint64_t	ino;
	uint64_t	gen;
	uint64_t	mtime;
	uint64_t	ctime;
	uint64_t	size;
	uint32_t	type;
	uint64_t	mode;
	uint64_t	links;
} zev_inode_info_t;

#define ZEV_ERRSTR(rec)		((char *)(rec + 1))
#define ZEV_DATASET(rec)	((char *)(rec + 1))
#define ZEV_MOUNTPOINT(rec)	(((char *)(rec + 1)) + rec->dataset_len + 1)
#define ZEV_NAME(rec)		((char *)(rec + 1))
#define ZEV_SRCNAME(rec)	((char *)(rec + 1))
#define ZEV_DSTNAME(rec)	(((char *)(rec + 1)) + rec->srcname_len + 1)
#define ZEV_LINK(rec)		(((char *)(rec + 1)) + rec->name_len + 1)

typedef struct zev_header_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
} zev_header_t;

typedef struct zev_error_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint32_t		failed_op;
	uint32_t		errstr_len;
	/* error string follows */
} zev_error_t;

typedef struct zev_zfs_mount_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	uint64_t		root_ino;
	boolean_t		remount;
	uint32_t		dataset_len;
	uint32_t		mountpoint_len;
	/* dataset follows */
	/* mountpoint follows */
} zev_zfs_mount_t;

typedef struct zev_zfs_umount_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
} zev_zfs_umount_t;

typedef struct zev_zvol_truncate_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	uint64_t		offset;
	uint64_t		length;
	uint32_t		dataset_len;
	/* dataset follows */
} zev_zvol_truncate_t;

typedef struct zev_zvol_write_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	uint64_t		offset;
	uint64_t		length;
	uint32_t		dataset_len;
	/* dataset follows */
} zev_zvol_write_t;

typedef struct zev_znode_close_after_update_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	file;
} zev_znode_close_after_update_t;

typedef struct zev_znode_create_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	file;
	zev_inode_info_t	parent;
	uint32_t		name_len;
	/* name follows */
} zev_znode_create_t;

typedef struct zev_znode_create_t zev_znode_mkdir_t;
typedef struct zev_znode_create_t zev_znode_make_xattr_dir_t;

typedef struct zev_znode_remove_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	parent;
	uint32_t		name_len;
	/* name follows */
} zev_znode_remove_t;

typedef struct zev_znode_remove_t zev_znode_rmdir_t;

typedef struct zev_znode_link_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	parent;
	zev_inode_info_t	file;
	uint32_t		name_len;
	/* new_name follows */
} zev_znode_link_t;

typedef struct zev_znode_symlink_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	parent;
	zev_inode_info_t	file;
	uint32_t		name_len;
	uint32_t		link_len;
	/* name follows */
	/* link follows */
} zev_znode_symlink_t;

typedef struct zev_znode_rename_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	srcdir;
	zev_inode_info_t	dstdir;
	zev_inode_info_t	file;
	uint32_t		srcname_len;
	uint32_t		dstname_len;
	/* srcname follows */
	/* dstname follows */
} zev_znode_rename_t;

typedef struct zev_znode_write_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	file;
	uint64_t		offset;
	uint64_t		length;
} zev_znode_write_t;

typedef struct zev_znode_truncate_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	file;
	uint64_t		offset;
	uint64_t		length;
} zev_znode_truncate_t;

typedef struct zev_znode_setattr_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	file;
} zev_znode_setattr_t;

typedef struct zev_znode_acl_t {
	uint32_t		record_len;
	uint32_t		op;
	uint64_t		op_time;
	uint64_t		guid;
	zev_inode_info_t	file;
} zev_znode_acl_t;

/* convenience helper definition */
typedef union {
	zev_header_t				header;

	union {
		zev_zfs_mount_t			mount;
		zev_zfs_umount_t		umount;
	} zfs;
	union {
		zev_zvol_truncate_t		truncate;
		zev_zvol_write_t		write;
	} zvol;
	union {
		zev_znode_close_after_update_t	close;
		zev_znode_create_t		create;
		zev_znode_mkdir_t		mkdir;
		zev_znode_make_xattr_dir_t	mkxattrdir;
		zev_znode_remove_t		remove;
		zev_znode_rmdir_t		rmdir;
		zev_znode_link_t		link;
		zev_znode_symlink_t		symlink;
		zev_znode_rename_t		rename;
		zev_znode_write_t		write;
		zev_znode_truncate_t		truncate;
		zev_znode_setattr_t		setattr;
		zev_znode_acl_t			acl;
	} znode;
} zev_event_t;



typedef struct zev_statistics_t {
	uint64_t	zev_queue_len;
	uint64_t	zev_bytes_read;
	/* runtime settings */
	uint64_t	zev_max_queue_len;
	uint64_t	zev_poll_wakeup_queue_len;
	/* counters */
	uint64_t	zev_cnt_total_events;
	uint64_t	zev_cnt_errors;
	/* zfsvfs ops */
	uint64_t	zev_cnt_zfs_mount;
	uint64_t	zev_cnt_zfs_umount;
	/* zvol ops */
	uint64_t	zev_cnt_zvol_write;
	uint64_t	zev_cnt_zvol_truncate;
	/* znode ops */
	uint64_t	zev_cnt_znode_close_after_update;
	uint64_t	zev_cnt_znode_create;
	uint64_t	zev_cnt_znode_remove;
	uint64_t	zev_cnt_znode_link;
	uint64_t	zev_cnt_znode_symlink;
	uint64_t	zev_cnt_znode_rename;
	uint64_t	zev_cnt_znode_write;
	uint64_t	zev_cnt_znode_truncate;
	uint64_t	zev_cnt_znode_setattr;
	uint64_t	zev_cnt_znode_acl;
} zev_statistics_t;

typedef struct zev_ioctl_poolarg {
	uint64_t	zev_poolname_len;
	char		zev_poolname[MAXPATHLEN];
} zev_ioctl_poolarg_t;

#ifdef _KERNEL
typedef struct zev_msg_t {
	struct zev_msg_t	*next;
	int			 size;
	/* data follows */
} zev_msg_t;

void zev_queue_error(int op, char *fmt, ...);
void zev_queue_message(int op, zev_msg_t *msg);
void zev_queue_message_nvlist(int op, nvlist_t *nvl);
int zev_skip_pool(objset_t *os);

#endif

#endif /* __ZEV_H__ */