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Annotation of Net2/sys/disklabel.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1987, 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)disklabel.h 7.19 (Berkeley) 5/7/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Disk description table, see disktab(5)
        !            38:  */
        !            39: #define        _PATH_DISKTAB   "/etc/disktab"
        !            40: #define        DISKTAB         "/etc/disktab"          /* deprecated */
        !            41: 
        !            42: /*
        !            43:  * Each disk has a label which includes information about the hardware
        !            44:  * disk geometry, filesystem partitions, and drive specific information.
        !            45:  * The label is in block 0 or 1, possibly offset from the beginning
        !            46:  * to leave room for a bootstrap, etc.
        !            47:  */
        !            48: 
        !            49: /* XXX these should be defined per controller (or drive) elsewhere, not here! */
        !            50: #ifdef i386
        !            51: #define LABELSECTOR    1                       /* sector containing label */
        !            52: #define LABELOFFSET    0                       /* offset of label in sector */
        !            53: #endif
        !            54: 
        !            55: #ifndef        LABELSECTOR
        !            56: #define LABELSECTOR    0                       /* sector containing label */
        !            57: #endif
        !            58: 
        !            59: #ifndef        LABELOFFSET
        !            60: #define LABELOFFSET    64                      /* offset of label in sector */
        !            61: #endif
        !            62: 
        !            63: #define DISKMAGIC      ((u_long) 0x82564557)   /* The disk magic number */
        !            64: #ifndef MAXPARTITIONS
        !            65: #define        MAXPARTITIONS   8
        !            66: #endif
        !            67: 
        !            68: 
        !            69: #ifndef LOCORE
        !            70: struct disklabel {
        !            71:        u_long  d_magic;                /* the magic number */
        !            72:        short   d_type;                 /* drive type */
        !            73:        short   d_subtype;              /* controller/d_type specific */
        !            74:        char    d_typename[16];         /* type name, e.g. "eagle" */
        !            75:        /* 
        !            76:         * d_packname contains the pack identifier and is returned when
        !            77:         * the disklabel is read off the disk or in-core copy.
        !            78:         * d_boot0 and d_boot1 are the (optional) names of the
        !            79:         * primary (block 0) and secondary (block 1-15) bootstraps
        !            80:         * as found in /usr/mdec.  These are returned when using
        !            81:         * getdiskbyname(3) to retrieve the values from /etc/disktab.
        !            82:         */
        !            83: #if defined(KERNEL) || defined(STANDALONE)
        !            84:        char    d_packname[16];                 /* pack identifier */ 
        !            85: #else
        !            86:        union {
        !            87:                char    un_d_packname[16];      /* pack identifier */ 
        !            88:                struct {
        !            89:                        char *un_d_boot0;       /* primary bootstrap name */
        !            90:                        char *un_d_boot1;       /* secondary bootstrap name */
        !            91:                } un_b; 
        !            92:        } d_un; 
        !            93: #define d_packname     d_un.un_d_packname
        !            94: #define d_boot0                d_un.un_b.un_d_boot0
        !            95: #define d_boot1                d_un.un_b.un_d_boot1
        !            96: #endif /* ! KERNEL or STANDALONE */
        !            97:                        /* disk geometry: */
        !            98:        u_long  d_secsize;              /* # of bytes per sector */
        !            99:        u_long  d_nsectors;             /* # of data sectors per track */
        !           100:        u_long  d_ntracks;              /* # of tracks per cylinder */
        !           101:        u_long  d_ncylinders;           /* # of data cylinders per unit */
        !           102:        u_long  d_secpercyl;            /* # of data sectors per cylinder */
        !           103:        u_long  d_secperunit;           /* # of data sectors per unit */
        !           104:        /*
        !           105:         * Spares (bad sector replacements) below
        !           106:         * are not counted in d_nsectors or d_secpercyl.
        !           107:         * Spare sectors are assumed to be physical sectors
        !           108:         * which occupy space at the end of each track and/or cylinder.
        !           109:         */
        !           110:        u_short d_sparespertrack;       /* # of spare sectors per track */
        !           111:        u_short d_sparespercyl;         /* # of spare sectors per cylinder */
        !           112:        /*
        !           113:         * Alternate cylinders include maintenance, replacement,
        !           114:         * configuration description areas, etc.
        !           115:         */
        !           116:        u_long  d_acylinders;           /* # of alt. cylinders per unit */
        !           117: 
        !           118:                        /* hardware characteristics: */
        !           119:        /*
        !           120:         * d_interleave, d_trackskew and d_cylskew describe perturbations
        !           121:         * in the media format used to compensate for a slow controller.
        !           122:         * Interleave is physical sector interleave, set up by the formatter
        !           123:         * or controller when formatting.  When interleaving is in use,
        !           124:         * logically adjacent sectors are not physically contiguous,
        !           125:         * but instead are separated by some number of sectors.
        !           126:         * It is specified as the ratio of physical sectors traversed
        !           127:         * per logical sector.  Thus an interleave of 1:1 implies contiguous
        !           128:         * layout, while 2:1 implies that logical sector 0 is separated
        !           129:         * by one sector from logical sector 1.
        !           130:         * d_trackskew is the offset of sector 0 on track N
        !           131:         * relative to sector 0 on track N-1 on the same cylinder.
        !           132:         * Finally, d_cylskew is the offset of sector 0 on cylinder N
        !           133:         * relative to sector 0 on cylinder N-1.
        !           134:         */
        !           135:        u_short d_rpm;                  /* rotational speed */
        !           136:        u_short d_interleave;           /* hardware sector interleave */
        !           137:        u_short d_trackskew;            /* sector 0 skew, per track */
        !           138:        u_short d_cylskew;              /* sector 0 skew, per cylinder */
        !           139:        u_long  d_headswitch;           /* head switch time, usec */
        !           140:        u_long  d_trkseek;              /* track-to-track seek, usec */
        !           141:        u_long  d_flags;                /* generic flags */
        !           142: #define NDDATA 5
        !           143:        u_long  d_drivedata[NDDATA];    /* drive-type specific information */
        !           144: #define NSPARE 5
        !           145:        u_long  d_spare[NSPARE];        /* reserved for future use */
        !           146:        u_long  d_magic2;               /* the magic number (again) */
        !           147:        u_short d_checksum;             /* xor of data incl. partitions */
        !           148: 
        !           149:                        /* filesystem and partition information: */
        !           150:        u_short d_npartitions;          /* number of partitions in following */
        !           151:        u_long  d_bbsize;               /* size of boot area at sn0, bytes */
        !           152:        u_long  d_sbsize;               /* max size of fs superblock, bytes */
        !           153:        struct  partition {             /* the partition table */
        !           154:                u_long  p_size;         /* number of sectors in partition */
        !           155:                u_long  p_offset;       /* starting sector */
        !           156:                u_long  p_fsize;        /* filesystem basic fragment size */
        !           157:                u_char  p_fstype;       /* filesystem type, see below */
        !           158:                u_char  p_frag;         /* filesystem fragments per block */
        !           159:                u_short p_cpg;          /* filesystem cylinders per group */
        !           160:        } d_partitions[MAXPARTITIONS];  /* actually may be more */
        !           161: };
        !           162: #else LOCORE
        !           163:        /*
        !           164:         * offsets for asm boot files.
        !           165:         */
        !           166:        .set    d_secsize,40
        !           167:        .set    d_nsectors,44
        !           168:        .set    d_ntracks,48
        !           169:        .set    d_ncylinders,52
        !           170:        .set    d_secpercyl,56
        !           171:        .set    d_secperunit,60
        !           172:        .set    d_end_,276              /* size of disk label */
        !           173: #endif LOCORE
        !           174: 
        !           175: /* d_type values: */
        !           176: #define        DTYPE_SMD               1               /* SMD, XSMD; VAX hp/up */
        !           177: #define        DTYPE_MSCP              2               /* MSCP */
        !           178: #define        DTYPE_DEC               3               /* other DEC (rk, rl) */
        !           179: #define        DTYPE_SCSI              4               /* SCSI */
        !           180: #define        DTYPE_ESDI              5               /* ESDI interface */
        !           181: #define        DTYPE_ST506             6               /* ST506 etc. */
        !           182: #define        DTYPE_FLOPPY            10              /* floppy */
        !           183: 
        !           184: #ifdef DKTYPENAMES
        !           185: static char *dktypenames[] = {
        !           186:        "unknown",
        !           187:        "SMD",
        !           188:        "MSCP",
        !           189:        "old DEC",
        !           190:        "SCSI",
        !           191:        "ESDI",
        !           192:        "ST506",
        !           193:        "type 7",
        !           194:        "type 8",
        !           195:        "type 9",
        !           196:        "floppy",
        !           197:        0
        !           198: };
        !           199: #define DKMAXTYPES     (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
        !           200: #endif
        !           201: 
        !           202: /*
        !           203:  * Filesystem type and version.
        !           204:  * Used to interpret other filesystem-specific
        !           205:  * per-partition information.
        !           206:  */
        !           207: #define        FS_UNUSED       0               /* unused */
        !           208: #define        FS_SWAP         1               /* swap */
        !           209: #define        FS_V6           2               /* Sixth Edition */
        !           210: #define        FS_V7           3               /* Seventh Edition */
        !           211: #define        FS_SYSV         4               /* System V */
        !           212: #define        FS_V71K         5               /* V7 with 1K blocks (4.1, 2.9) */
        !           213: #define        FS_V8           6               /* Eighth Edition, 4K blocks */
        !           214: #define        FS_BSDFFS       7               /* 4.2BSD fast file system */
        !           215: #define        FS_MSDOS        8               /* MSDOS file system */
        !           216: 
        !           217: #ifdef DKTYPENAMES
        !           218: static char *fstypenames[] = {
        !           219:        "unused",
        !           220:        "swap",
        !           221:        "Version 6",
        !           222:        "Version 7",
        !           223:        "System V",
        !           224:        "4.1BSD",
        !           225:        "Eighth Edition",
        !           226:        "4.2BSD",
        !           227:        "MSDOS",
        !           228:        0
        !           229: };
        !           230: #define FSMAXTYPES     (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
        !           231: #endif
        !           232: 
        !           233: /*
        !           234:  * flags shared by various drives:
        !           235:  */
        !           236: #define                D_REMOVABLE     0x01            /* removable media */
        !           237: #define                D_ECC           0x02            /* supports ECC */
        !           238: #define                D_BADSECT       0x04            /* supports bad sector forw. */
        !           239: #define                D_RAMDISK       0x08            /* disk emulator */
        !           240: #define                D_CHAIN         0x10            /* can do back-back transfers */
        !           241: 
        !           242: /*
        !           243:  * Drive data for SMD.
        !           244:  */
        !           245: #define        d_smdflags      d_drivedata[0]
        !           246: #define                D_SSE           0x1             /* supports skip sectoring */
        !           247: #define        d_mindist       d_drivedata[1]
        !           248: #define        d_maxdist       d_drivedata[2]
        !           249: #define        d_sdist         d_drivedata[3]
        !           250: 
        !           251: /*
        !           252:  * Drive data for ST506.
        !           253:  */
        !           254: #define d_precompcyl   d_drivedata[0]
        !           255: #define d_gap3         d_drivedata[1]          /* used only when formatting */
        !           256: 
        !           257: /*
        !           258:  * Drive data for SCSI.
        !           259:  */
        !           260: #define        d_blind         d_drivedata[0]
        !           261: 
        !           262: #ifndef LOCORE
        !           263: /*
        !           264:  * Structure used to perform a format
        !           265:  * or other raw operation, returning data
        !           266:  * and/or register values.
        !           267:  * Register identification and format
        !           268:  * are device- and driver-dependent.
        !           269:  */
        !           270: struct format_op {
        !           271:        char    *df_buf;
        !           272:        int     df_count;               /* value-result */
        !           273:        daddr_t df_startblk;
        !           274:        int     df_reg[8];              /* result */
        !           275: };
        !           276: 
        !           277: /*
        !           278:  * Structure used internally to retrieve
        !           279:  * information about a partition on a disk.
        !           280:  */
        !           281: struct partinfo {
        !           282:        struct disklabel *disklab;
        !           283:        struct partition *part;
        !           284: };
        !           285: 
        !           286: /*
        !           287:  * Disk-specific ioctls.
        !           288:  */
        !           289:                /* get and set disklabel; DIOCGPART used internally */
        !           290: #define DIOCGDINFO     _IOR('d', 101, struct disklabel)/* get */
        !           291: #define DIOCSDINFO     _IOW('d', 102, struct disklabel)/* set */
        !           292: #define DIOCWDINFO     _IOW('d', 103, struct disklabel)/* set, update disk */
        !           293: #define DIOCGPART      _IOW('d', 104, struct partinfo) /* get partition */
        !           294: 
        !           295: /* do format operation, read or write */
        !           296: #define DIOCRFORMAT    _IOWR('d', 105, struct format_op)
        !           297: #define DIOCWFORMAT    _IOWR('d', 106, struct format_op)
        !           298: 
        !           299: #define DIOCSSTEP      _IOW('d', 107, int)     /* set step rate */
        !           300: #define DIOCSRETRIES   _IOW('d', 108, int)     /* set # of retries */
        !           301: #define DIOCWLABEL     _IOW('d', 109, int)     /* write en/disable label */
        !           302: 
        !           303: #define DIOCSBAD       _IOW('d', 110, struct dkbad)    /* set kernel dkbad */
        !           304: 
        !           305: #endif LOCORE
        !           306: 
        !           307: #if !defined(KERNEL) && !defined(LOCORE)
        !           308: 
        !           309: #include <sys/cdefs.h>
        !           310: 
        !           311: __BEGIN_DECLS
        !           312: struct disklabel *getdiskbyname __P((const char *));
        !           313: __END_DECLS
        !           314: 
        !           315: #endif

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