c743e44fbb
The st tape driver recently added the MTWEOFI ioctl, which writes a tape filemark (EOF), like the MTWEOF ioctl, except that MTWEOFI returns immediately. This makes certain applications, like backup software, run much more quickly on buffered tape drives. Since legacy applications do not know about this new MTWEOFI ioctl, this patch adds a new ioctl option that tells the st driver to return immediately when writing an EOF (i.e. a filemark). This new flag is much like the existing flag that tells the st driver to perform writes (and certain other IOs) immediately, but this new flag only applies to writing EOFs. This new feature is controlled via the MTSETDRVBUFFER ioctl, using the newly-defined MT_ST_NOWAIT_EOF flag. Use of this new feature is displayed via the sysfs tape "options" attribute. The st documentation was updated to mention this new flag, as well as the problems that can occur from using it. Signed-off-by: Lee Duncan <lduncan@suse.com> Acked-by: Kai Makisara <kai.makisara@kolumbus.fi> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
208 lines
7.9 KiB
C
208 lines
7.9 KiB
C
/*
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* linux/mtio.h header file for Linux. Written by H. Bergman
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*
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* Modified for special ioctls provided by zftape in September 1997
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* by C.-J. Heine.
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*/
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#ifndef _LINUX_MTIO_H
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#define _LINUX_MTIO_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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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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int mt_count; /* how many of them */
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};
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/* Magnetic Tape operations [Not all operations supported by all drivers]: */
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#define MTRESET 0 /* +reset drive in case of problems */
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#define MTFSF 1 /* forward space over FileMark,
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* position at first record of next file
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*/
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#define MTBSF 2 /* backward space FileMark (position before FM) */
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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 MTWEOF 5 /* write an end-of-file record (mark) */
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#define MTREW 6 /* rewind */
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#define MTOFFL 7 /* rewind and put the drive offline (eject?) */
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#define MTNOP 8 /* no op, set status only (read with MTIOCGET) */
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#define MTRETEN 9 /* retension tape */
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#define MTBSFM 10 /* +backward space FileMark, position at FM */
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#define MTFSFM 11 /* +forward space FileMark, position at FM */
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#define MTEOM 12 /* goto end of recorded media (for appending files).
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* MTEOM positions after the last FM, ready for
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* appending another file.
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*/
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#define MTERASE 13 /* erase tape -- be careful! */
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#define MTRAS1 14 /* run self test 1 (nondestructive) */
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#define MTRAS2 15 /* run self test 2 (destructive) */
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#define MTRAS3 16 /* reserved for self test 3 */
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#define MTSETBLK 20 /* set block length (SCSI) */
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#define MTSETDENSITY 21 /* set tape density (SCSI) */
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#define MTSEEK 22 /* seek to block (Tandberg, etc.) */
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#define MTTELL 23 /* tell block (Tandberg, etc.) */
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#define MTSETDRVBUFFER 24 /* set the drive buffering according to SCSI-2 */
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/* ordinary buffered operation with code 1 */
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#define MTFSS 25 /* space forward over setmarks */
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#define MTBSS 26 /* space backward over setmarks */
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#define MTWSM 27 /* write setmarks */
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#define MTLOCK 28 /* lock the drive door */
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#define MTUNLOCK 29 /* unlock the drive door */
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#define MTLOAD 30 /* execute the SCSI load command */
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#define MTUNLOAD 31 /* execute the SCSI unload command */
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#define MTCOMPRESSION 32/* control compression with SCSI mode page 15 */
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#define MTSETPART 33 /* Change the active tape partition */
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#define MTMKPART 34 /* Format the tape with one or two partitions */
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#define MTWEOFI 35 /* write an end-of-file record (mark) in immediate mode */
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/* structure for MTIOCGET - mag tape get status command */
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struct mtget {
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long mt_type; /* type of magtape device */
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long mt_resid; /* residual count: (not sure)
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* number of bytes ignored, or
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* number of files not skipped, or
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* number of records not skipped.
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*/
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/* the following registers are device dependent */
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long mt_dsreg; /* status register */
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long mt_gstat; /* generic (device independent) status */
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long mt_erreg; /* error register */
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/* The next two fields are not always used */
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__kernel_daddr_t mt_fileno; /* number of current file on tape */
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__kernel_daddr_t mt_blkno; /* current block number */
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};
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/*
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* Constants for mt_type. Not all of these are supported,
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* and these are not all of the ones that are supported.
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*/
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#define MT_ISUNKNOWN 0x01
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#define MT_ISQIC02 0x02 /* Generic QIC-02 tape streamer */
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#define MT_ISWT5150 0x03 /* Wangtek 5150EQ, QIC-150, QIC-02 */
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#define MT_ISARCHIVE_5945L2 0x04 /* Archive 5945L-2, QIC-24, QIC-02? */
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#define MT_ISCMSJ500 0x05 /* CMS Jumbo 500 (QIC-02?) */
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#define MT_ISTDC3610 0x06 /* Tandberg 6310, QIC-24 */
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#define MT_ISARCHIVE_VP60I 0x07 /* Archive VP60i, QIC-02 */
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#define MT_ISARCHIVE_2150L 0x08 /* Archive Viper 2150L */
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#define MT_ISARCHIVE_2060L 0x09 /* Archive Viper 2060L */
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#define MT_ISARCHIVESC499 0x0A /* Archive SC-499 QIC-36 controller */
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#define MT_ISQIC02_ALL_FEATURES 0x0F /* Generic QIC-02 with all features */
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#define MT_ISWT5099EEN24 0x11 /* Wangtek 5099-een24, 60MB, QIC-24 */
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#define MT_ISTEAC_MT2ST 0x12 /* Teac MT-2ST 155mb drive, Teac DC-1 card (Wangtek type) */
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#define MT_ISEVEREX_FT40A 0x32 /* Everex FT40A (QIC-40) */
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#define MT_ISDDS1 0x51 /* DDS device without partitions */
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#define MT_ISDDS2 0x52 /* DDS device with partitions */
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#define MT_ISONSTREAM_SC 0x61 /* OnStream SCSI tape drives (SC-x0)
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and SCSI emulated (DI, DP, USB) */
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#define MT_ISSCSI1 0x71 /* Generic ANSI SCSI-1 tape unit */
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#define MT_ISSCSI2 0x72 /* Generic ANSI SCSI-2 tape unit */
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/* QIC-40/80/3010/3020 ftape supported drives.
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* 20bit vendor ID + 0x800000 (see ftape-vendors.h)
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*/
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#define MT_ISFTAPE_UNKNOWN 0x800000 /* obsolete */
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#define MT_ISFTAPE_FLAG 0x800000
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/* structure for MTIOCPOS - mag tape get position command */
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struct mtpos {
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long mt_blkno; /* current block number */
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};
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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 MTIOCPOS _IOR('m', 3, struct mtpos) /* get tape position */
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/* Generic Mag Tape (device independent) status macros for examining
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* mt_gstat -- HP-UX compatible.
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* There is room for more generic status bits here, but I don't
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* know which of them are reserved. At least three or so should
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* be added to make this really useful.
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*/
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#define GMT_EOF(x) ((x) & 0x80000000)
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#define GMT_BOT(x) ((x) & 0x40000000)
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#define GMT_EOT(x) ((x) & 0x20000000)
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#define GMT_SM(x) ((x) & 0x10000000) /* DDS setmark */
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#define GMT_EOD(x) ((x) & 0x08000000) /* DDS EOD */
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#define GMT_WR_PROT(x) ((x) & 0x04000000)
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/* #define GMT_ ? ((x) & 0x02000000) */
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#define GMT_ONLINE(x) ((x) & 0x01000000)
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#define GMT_D_6250(x) ((x) & 0x00800000)
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#define GMT_D_1600(x) ((x) & 0x00400000)
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#define GMT_D_800(x) ((x) & 0x00200000)
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/* #define GMT_ ? ((x) & 0x00100000) */
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/* #define GMT_ ? ((x) & 0x00080000) */
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#define GMT_DR_OPEN(x) ((x) & 0x00040000) /* door open (no tape) */
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/* #define GMT_ ? ((x) & 0x00020000) */
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#define GMT_IM_REP_EN(x) ((x) & 0x00010000) /* immediate report mode */
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#define GMT_CLN(x) ((x) & 0x00008000) /* cleaning requested */
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/* 15 generic status bits unused */
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/* SCSI-tape specific definitions */
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/* Bitfield shifts in the status */
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#define MT_ST_BLKSIZE_SHIFT 0
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#define MT_ST_BLKSIZE_MASK 0xffffff
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#define MT_ST_DENSITY_SHIFT 24
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#define MT_ST_DENSITY_MASK 0xff000000
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#define MT_ST_SOFTERR_SHIFT 0
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#define MT_ST_SOFTERR_MASK 0xffff
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/* Bitfields for the MTSETDRVBUFFER ioctl */
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#define MT_ST_OPTIONS 0xf0000000
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#define MT_ST_BOOLEANS 0x10000000
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#define MT_ST_SETBOOLEANS 0x30000000
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#define MT_ST_CLEARBOOLEANS 0x40000000
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#define MT_ST_WRITE_THRESHOLD 0x20000000
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#define MT_ST_DEF_BLKSIZE 0x50000000
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#define MT_ST_DEF_OPTIONS 0x60000000
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#define MT_ST_TIMEOUTS 0x70000000
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#define MT_ST_SET_TIMEOUT (MT_ST_TIMEOUTS | 0x000000)
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#define MT_ST_SET_LONG_TIMEOUT (MT_ST_TIMEOUTS | 0x100000)
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#define MT_ST_SET_CLN 0x80000000
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#define MT_ST_BUFFER_WRITES 0x1
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#define MT_ST_ASYNC_WRITES 0x2
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#define MT_ST_READ_AHEAD 0x4
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#define MT_ST_DEBUGGING 0x8
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#define MT_ST_TWO_FM 0x10
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#define MT_ST_FAST_MTEOM 0x20
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#define MT_ST_AUTO_LOCK 0x40
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#define MT_ST_DEF_WRITES 0x80
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#define MT_ST_CAN_BSR 0x100
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#define MT_ST_NO_BLKLIMS 0x200
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#define MT_ST_CAN_PARTITIONS 0x400
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#define MT_ST_SCSI2LOGICAL 0x800
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#define MT_ST_SYSV 0x1000
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#define MT_ST_NOWAIT 0x2000
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#define MT_ST_SILI 0x4000
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#define MT_ST_NOWAIT_EOF 0x8000
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/* The mode parameters to be controlled. Parameter chosen with bits 20-28 */
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#define MT_ST_CLEAR_DEFAULT 0xfffff
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#define MT_ST_DEF_DENSITY (MT_ST_DEF_OPTIONS | 0x100000)
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#define MT_ST_DEF_COMPRESSION (MT_ST_DEF_OPTIONS | 0x200000)
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#define MT_ST_DEF_DRVBUFFER (MT_ST_DEF_OPTIONS | 0x300000)
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/* The offset for the arguments for the special HP changer load command. */
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#define MT_ST_HPLOADER_OFFSET 10000
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#endif /* _LINUX_MTIO_H */
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