add cleaned-up sys/mtio.h

this is mostly junk, but a few programs with tape-drive support
unconditionally include it, and it might be useful.

include/sys/mtio.h

+#ifndef _SYS_MTIO_H
+#define _SYS_MTIO_H
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+struct mtop {
+	short mt_op;
+	int mt_count;
+};
+
+#define _IOT_mtop _IOT (_IOTS (short), 1, _IOTS (int), 1, 0, 0)
+#define _IOT_mtget _IOT (_IOTS (long), 7, 0, 0, 0, 0)
+#define _IOT_mtpos _IOT_SIMPLE (long)
+#define _IOT_mtconfiginfo _IOT (_IOTS (long), 2, _IOTS (short), 3, _IOTS (long), 1)
+
+
+#define MTRESET 0
+#define MTFSF	1
+#define MTBSF	2
+#define MTFSR	3
+#define MTBSR	4
+#define MTWEOF	5
+#define MTREW	6
+#define MTOFFL	7
+#define MTNOP	8
+#define MTRETEN 9
+#define MTBSFM	10
+#define MTFSFM  11
+#define MTEOM	12
+#define MTERASE 13
+#define MTRAS1  14
+#define MTRAS2	15
+#define MTRAS3  16
+#define MTSETBLK 20
+#define MTSETDENSITY 21
+#define MTSEEK	22
+#define MTTELL	23
+#define MTSETDRVBUFFER 24
+#define MTFSS	25
+#define MTBSS	26
+#define MTWSM	27
+#define MTLOCK  28
+#define MTUNLOCK 29
+#define MTLOAD  30
+#define MTUNLOAD 31
+#define MTCOMPRESSION 32
+#define MTSETPART 33
+#define MTMKPART  34
+
+struct mtget {
+	long mt_type;
+	long mt_resid;
+	long mt_dsreg;
+	long mt_gstat;
+	long mt_erreg;
+	int mt_fileno;
+	int mt_blkno;
+};
+
+#define MT_ISUNKNOWN		0x01
+#define MT_ISQIC02		0x02
+#define MT_ISWT5150		0x03
+#define MT_ISARCHIVE_5945L2	0x04
+#define MT_ISCMSJ500		0x05
+#define MT_ISTDC3610		0x06
+#define MT_ISARCHIVE_VP60I	0x07
+#define MT_ISARCHIVE_2150L	0x08
+#define MT_ISARCHIVE_2060L	0x09
+#define MT_ISARCHIVESC499	0x0A
+#define MT_ISQIC02_ALL_FEATURES	0x0F
+#define MT_ISWT5099EEN24	0x11
+#define MT_ISTEAC_MT2ST		0x12
+#define MT_ISEVEREX_FT40A	0x32
+#define MT_ISDDS1		0x51
+#define MT_ISDDS2		0x52
+#define MT_ISSCSI1		0x71
+#define MT_ISSCSI2		0x72
+#define MT_ISFTAPE_UNKNOWN	0x800000
+#define MT_ISFTAPE_FLAG		0x800000
+
+struct mt_tape_info {
+	long t_type;
+	char *t_name;
+};
+
+#define MT_TAPE_INFO \
+{									      \
+	{MT_ISUNKNOWN,		"Unknown type of tape device"},		      \
+	{MT_ISQIC02,		"Generic QIC-02 tape streamer"},	      \
+	{MT_ISWT5150,		"Wangtek 5150, QIC-150"},		      \
+	{MT_ISARCHIVE_5945L2,	"Archive 5945L-2"},			      \
+	{MT_ISCMSJ500,		"CMS Jumbo 500"},			      \
+	{MT_ISTDC3610,		"Tandberg TDC 3610, QIC-24"},		      \
+	{MT_ISARCHIVE_VP60I,	"Archive VP60i, QIC-02"},		      \
+	{MT_ISARCHIVE_2150L,	"Archive Viper 2150L"},			      \
+	{MT_ISARCHIVE_2060L,	"Archive Viper 2060L"},			      \
+	{MT_ISARCHIVESC499,	"Archive SC-499 QIC-36 controller"},	      \
+	{MT_ISQIC02_ALL_FEATURES, "Generic QIC-02 tape, all features"},	      \
+	{MT_ISWT5099EEN24,	"Wangtek 5099-een24, 60MB"},		      \
+	{MT_ISTEAC_MT2ST,	"Teac MT-2ST 155mb data cassette drive"},     \
+	{MT_ISEVEREX_FT40A,	"Everex FT40A, QIC-40"},		      \
+	{MT_ISSCSI1,		"Generic SCSI-1 tape"},			      \
+	{MT_ISSCSI2,		"Generic SCSI-2 tape"},			      \
+	{0, NULL}							      \
+}
+
+struct mtpos {
+	long mt_blkno;
+};
+
+struct mtconfiginfo  {
+	long mt_type;
+	long ifc_type;
+	unsigned short irqnr;
+	unsigned short dmanr;
+	unsigned short port;
+	unsigned long debug;
+	unsigned have_dens:1;
+	unsigned have_bsf:1;
+	unsigned have_fsr:1;
+	unsigned have_bsr:1;
+	unsigned have_eod:1;
+	unsigned have_seek:1;
+	unsigned have_tell:1;
+	unsigned have_ras1:1;
+	unsigned have_ras2:1;
+	unsigned have_ras3:1;
+	unsigned have_qfa:1;
+	unsigned pad1:5;
+	char reserved[10];
+};
+
+#define	MTIOCTOP _IOW('m', 1, struct mtop)
+#define	MTIOCGET _IOR('m', 2, struct mtget)
+#define	MTIOCPOS _IOR('m', 3, struct mtpos)
+
+#define	MTIOCGETCONFIG	_IOR('m', 4, struct mtconfiginfo)
+#define	MTIOCSETCONFIG	_IOW('m', 5, struct mtconfiginfo)
+
+#define GMT_EOF(x)              ((x) & 0x80000000)
+#define GMT_BOT(x)              ((x) & 0x40000000)
+#define GMT_EOT(x)              ((x) & 0x20000000)
+#define GMT_SM(x)               ((x) & 0x10000000)
+#define GMT_EOD(x)              ((x) & 0x08000000)
+#define GMT_WR_PROT(x)          ((x) & 0x04000000)
+#define GMT_ONLINE(x)           ((x) & 0x01000000)
+#define GMT_D_6250(x)           ((x) & 0x00800000)
+#define GMT_D_1600(x)           ((x) & 0x00400000)
+#define GMT_D_800(x)            ((x) & 0x00200000)
+#define GMT_DR_OPEN(x)          ((x) & 0x00040000)
+#define GMT_IM_REP_EN(x)        ((x) & 0x00010000)
+
+#define MT_ST_BLKSIZE_SHIFT	0
+#define MT_ST_BLKSIZE_MASK	0xffffff
+#define MT_ST_DENSITY_SHIFT	24
+#define MT_ST_DENSITY_MASK	0xff000000
+#define MT_ST_SOFTERR_SHIFT	0
+#define MT_ST_SOFTERR_MASK	0xffff
+#define MT_ST_OPTIONS		0xf0000000
+#define MT_ST_BOOLEANS		0x10000000
+#define MT_ST_SETBOOLEANS	0x30000000
+#define MT_ST_CLEARBOOLEANS	0x40000000
+#define MT_ST_WRITE_THRESHOLD	0x20000000
+#define MT_ST_DEF_BLKSIZE	0x50000000
+#define MT_ST_DEF_OPTIONS	0x60000000
+#define MT_ST_BUFFER_WRITES	0x1
+#define MT_ST_ASYNC_WRITES	0x2
+#define MT_ST_READ_AHEAD	0x4
+#define MT_ST_DEBUGGING		0x8
+#define MT_ST_TWO_FM		0x10
+#define MT_ST_FAST_MTEOM	0x20
+#define MT_ST_AUTO_LOCK		0x40
+#define MT_ST_DEF_WRITES	0x80
+#define MT_ST_CAN_BSR		0x100
+#define MT_ST_NO_BLKLIMS	0x200
+#define MT_ST_CAN_PARTITIONS    0x400
+#define MT_ST_SCSI2LOGICAL      0x800
+#define MT_ST_CLEAR_DEFAULT	0xfffff
+#define MT_ST_DEF_DENSITY	(MT_ST_DEF_OPTIONS | 0x100000)
+#define MT_ST_DEF_COMPRESSION	(MT_ST_DEF_OPTIONS | 0x200000)
+#define MT_ST_DEF_DRVBUFFER	(MT_ST_DEF_OPTIONS | 0x300000)
+#define MT_ST_HPLOADER_OFFSET 10000
+#ifndef DEFTAPE
+# define DEFTAPE	"/dev/tape"
+#endif
+
+#endif