229 lines
8.0 KiB
Groff
229 lines
8.0 KiB
Groff
.\" Copyright (c) 1996
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.\" Mike Pritchard <mpp@FreeBSD.org>. All rights reserved.
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mtio.4 8.1 (Berkeley) 6/5/93
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.\"
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.Dd February 11, 1996
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.Dt MTIO 4 i386
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.Os FreeBSD 2.2
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.Sh NAME
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.Nm mtio
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.Nd
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.Tn FreeBSD
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magtape interface
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.Sh DESCRIPTION
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The special files
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named
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.Pa /dev/[nr]st*
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refer to SCSI tape drives,
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which may be attached to the system.
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.Pa /dev/[nr]st*.ctl
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are control devices that can be used to issue ioctls to the SCSI
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tape driver to set parameters that are required to last beyond the
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unmounting of a tape.
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.Pp
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.Pp
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The rewind devices automatically rewind
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when the last requested read, write or seek has finished, or the end of the tape
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has been reached. The letter
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.Ql n
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is usually prepended to
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the name of the no-rewind devices.
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.Pp
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Tapes can be written with either fixed length records or variable length
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records. See
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.Xr st 4
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for more information. Two end-of-file markers mark the end of a tape, and
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one end-of-file marker marks the end of a tape file.
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If the tape is not to be rewound it is positioned with the
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head in between the two tape marks, where the next write
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will over write the second end-of-file marker.
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.Pp
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All of the magtape devices may be manipulated with the
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.Xr mt 1
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command.
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.Pp
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A number of
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.Xr ioctl 2
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operations are available
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on raw magnetic tape.
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The following definitions are from
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.Aq Pa sys/mtio.h :
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.Bd -literal
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/*
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* Structures and definitions for mag tape io control commands
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*/
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/* structure for MTIOCTOP - mag tape op command */
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struct mtop {
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short mt_op; /* operations defined below */
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daddr_t mt_count; /* how many of them */
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};
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/* operations */
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#define MTWEOF 0 /* write an end-of-file record */
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#define MTFSF 1 /* forward space file */
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#define MTBSF 2 /* backward space file */
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#define MTFSR 3 /* forward space record */
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#define MTBSR 4 /* backward space record */
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#define MTREW 5 /* rewind */
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#define MTOFFL 6 /* rewind and put the drive offline */
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#define MTNOP 7 /* no operation, sets status only */
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#define MTCACHE 8 /* enable controller cache */
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#define MTNOCACHE 9 /* disable controller cache */
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#if defined(__FreeBSD__)
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/* Set block size for device. If device is a variable size dev */
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/* a non zero parameter will change the device to a fixed block size */
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/* device with block size set to that of the parameter passed in. */
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/* Resetting the block size to 0 will restore the device to a variable */
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/* block size device. */
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#define MTSETBSIZ 10
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/* Set density values for device. They are defined in the SCSI II spec */
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/* and range from 0 to 0x17. Sets the value for the opened mode only */
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#define MTSETDNSTY 11
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#define MTERASE 12 /* erase to EOM */
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#define MTEOD 13 /* Space to EOM */
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#define MTCOMP 14 /* select compression mode 0=off, 1=def */
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#define MTRETENS 15 /* re-tension tape */
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#endif
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/* structure for MTIOCGET - mag tape get status command */
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struct mtget {
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short mt_type; /* type of magtape device */
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/* the following two registers are grossly device dependent */
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short mt_dsreg; /* ``drive status'' register */
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short mt_erreg; /* ``error'' register */
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/* end device-dependent registers */
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short mt_resid; /* residual count */
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#if defined (__FreeBSD__)
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daddr_t mt_blksiz; /* presently operating blocksize */
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daddr_t mt_density; /* presently operating density */
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daddr_t mt_comp; /* presently operating compression */
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daddr_t mt_blksiz0; /* blocksize for mode 0 */
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daddr_t mt_blksiz1; /* blocksize for mode 1 */
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daddr_t mt_blksiz2; /* blocksize for mode 2 */
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daddr_t mt_blksiz3; /* blocksize for mode 3 */
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daddr_t mt_density0; /* density for mode 0 */
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daddr_t mt_density1; /* density for mode 1 */
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daddr_t mt_density2; /* density for mode 2 */
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daddr_t mt_density3; /* density for mode 3 */
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/* the following are not yet implemented */
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u_char mt_comp0; /* compression type for mode 0 */
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u_char mt_comp1; /* compression type for mode 1 */
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u_char mt_comp2; /* compression type for mode 2 */
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u_char mt_comp3; /* compression type for mode 3 */
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#endif
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daddr_t mt_fileno; /* file number of current position */
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daddr_t mt_blkno; /* block number of current position */
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/* end not yet implemented */
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};
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/*
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* Constants for mt_type byte. These are the same
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* for controllers compatible with the types listed.
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*/
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#define MT_ISTS 0x01 /* TS-11 */
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#define MT_ISHT 0x02 /* TM03 Massbus: TE16, TU45, TU77 */
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#define MT_ISTM 0x03 /* TM11/TE10 Unibus */
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#define MT_ISMT 0x04 /* TM78/TU78 Massbus */
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#define MT_ISUT 0x05 /* SI TU-45 emulation on Unibus */
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#define MT_ISCPC 0x06 /* SUN */
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#define MT_ISAR 0x07 /* SUN */
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#define MT_ISTMSCP 0x08 /* DEC TMSCP protocol (TU81, TK50) */
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#define MT_ISCY 0x09 /* CCI Cipher */
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#define MT_ISCT 0x0a /* HP 1/4 tape */
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#define MT_ISFHP 0x0b /* HP 7980 1/2 tape */
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#define MT_ISEXABYTE 0x0c /* Exabyte */
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#define MT_ISEXA8200 0x0c /* Exabyte EXB-8200 */
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#define MT_ISEXA8500 0x0d /* Exabyte EXB-8500 */
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#define MT_ISVIPER1 0x0e /* Archive Viper-150 */
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#define MT_ISPYTHON 0x0f /* Archive Python (DAT) */
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#define MT_ISHPDAT 0x10 /* HP 35450A DAT drive */
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#define MT_ISMFOUR 0x11 /* M4 Data 1/2 9track drive */
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#define MT_ISTK50 0x12 /* DEC SCSI TK50 */
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#define MT_ISMT02 0x13 /* Emulex MT02 SCSI tape controller */
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/* mag tape io control commands */
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#define MTIOCTOP _IOW('m', 1, struct mtop) /* do a mag tape op */
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#define MTIOCGET _IOR('m', 2, struct mtget) /* get tape status */
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#define MTIOCIEOT _IO('m', 3) /* ignore EOT error */
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#define MTIOCEEOT _IO('m', 4) /* enable EOT error */
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#ifndef KERNEL
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#define DEFTAPE "/dev/nrst0"
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#endif
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#ifdef KERNEL
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/*
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* minor device number
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*/
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#define T_UNIT 003 /* unit selection */
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#define T_NOREWIND 004 /* no rewind on close */
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#define T_DENSEL 030 /* density select */
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#define T_800BPI 000 /* select 800 bpi */
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#define T_1600BPI 010 /* select 1600 bpi */
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#define T_6250BPI 020 /* select 6250 bpi */
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#define T_BADBPI 030 /* undefined selection */
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#endif
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#endif /* _SYS_MTIO_H_ */
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.Ed
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.Pp
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.Sh FILES
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.Bl -tag -width /dev/[nr]st* -compact
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.It Pa /dev/[nr]st*
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.El
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.Sh SEE ALSO
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.Xr mt 1 ,
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.Xr tar 1 ,
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.Xr st 4
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.Sh HISTORY
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The
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.Nm mtio
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manual appeared in
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.Bx 4.2 .
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An i386 version first appeared in FreeBSD 2.2.
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.Sh BUGS
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The status should be returned in a device independent format.
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.Pp
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The special file naming should be redone in a more consistent and
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understandable manner.
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