[unix-history] / usr / share / man / cat5 / disklabel.0



DISKLABEL(5)		      1990		     DISKLABEL(5)


N\bNA\bAM\bME\bE
     disklabel - disk pack label

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     #\b#i\bin\bnc\bcl\blu\bud\bde\be <\b<s\bsy\bys\bs/\b/d\bdi\bis\bsk\bkl\bla\bab\bbe\bel\bl.\b.h\bh>\b>

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     Each disk or disk pack on a system may contain a disk label
     which provides detailed information about the geometry of
     the disk and the partitions into which the disk is divided.
     It should be initialized when the disk is formatted, and may
     be changed later with the _\bd_\bi_\bs_\bk_\bl_\ba_\bb_\be_\bl(8) program.  This infor-
     mation is used by the system disk driver and by the
     bootstrap program to determine how to program the drive and
     where to find the filesystems on the disk partitions.  Addi-
     tional information is used by the filesystem in order to use
     the disk most efficiently and to locate important filesystem
     information.  The description of each partition contains an
     identifier for the partition type (standard filesystem, swap
     area, etc.).  The filesystem updates the in-core copy of the
     label if it contains incomplete information about the
     filesystem.

     The label is located in sector number _\bL_\bA_\bB_\bE_\bL_\bS_\bE_\bC_\bT_\bO_\bR of the
     drive, usually sector 0 where it may be found without any
     information about the disk geometry.  It is at an offset
     _\bL_\bA_\bB_\bE_\bL_\bO_\bF_\bF_\bS_\bE_\bT from the beginning of the sector, to allow room
     for the initial bootstrap.  The disk sector containing the
     label is normally made read-only so that it is not acciden-
     tally overwritten by pack-to-pack copies or swap operations;
     the DIOCWLABEL _\bi_\bo_\bc_\bt_\bl, which is done as needed by the _\bd_\bi_\bs_\bk_\bl_\ba_\b-
     _\bb_\be_\bl(8) program.

     A copy of the in-core label for a disk can be obtained with
     the DIOCGDINFO _\bi_\bo_\bc_\bt_\bl; this works with a file descriptor for
     a block or character (``raw'') device for any partition of
     the disk.	The in-core copy of the label is set by the
     DIOCSDINFO _\bi_\bo_\bc_\bt_\bl.	The offset of a partition cannot gen-
     erally be changed while it is open, nor can it be made
     smaller while it is open.	One exception is that any change
     is allowed if no label was found on the disk, and the driver
     was able to construct only a skeletal label without parti-
     tion information.	Finally, the DIOCWDINFO _\bi_\bo_\bc_\bt_\bl operation
     sets the in-core label and then updates the on-disk label;
     there must be an existing label on the disk for this opera-
     tion to succeed.  Thus, the initial label for a disk or disk
     pack must be installed by writing to the raw disk.  All of
     these operations are normally done using _\bd_\bi_\bs_\bk_\bl_\ba_\bb_\be_\bl(8).

     The format of the disk label, as specified in
     <_\bs_\by_\bs/_\bd_\bi_\bs_\bk_\bl_\ba_\bb_\be_\bl._\bh>, is
     /*


Printed 7/27/90               June				1


DISKLABEL(5)		      1990		     DISKLABEL(5)


      * Disk description table, see disktab(5)
      */
     #define   DISKTAB	      "/etc/disktab"

     /*
      * Each disk has a label which includes information about the hardware
      * disk geometry, filesystem partitions, and drive specific information.
      * The label is in block 0 or 1, possibly offset from the beginning
      * to leave room for a bootstrap, etc.
      */
     #define  LABELSECTOR    0			    /* sector containing label */
     #define LABELOFFSET     64                     /* offset of label in sector */
     #define DISKMAGIC	     ((u_long) 0x82564557)  /* The disk magic number */
     #ifndef MAXPARTITIONS
     #define  MAXPARTITIONS  8
     #endif


     #ifndef LOCORE
     struct disklabel {
	     u_long  d_magic;	     /* the magic number */
	     short   d_type;	     /* drive type */
	     short   d_subtype;      /* controller/d_type specific */
	     char    d_typename[16]; /* type name, e.g. "eagle" */
	     /*
	      * d_packname contains the pack identifier and is returned when
	      * the disklabel is read off the disk or in-core copy.
	      * d_boot0 and d_boot1 are the (optional) names of the
	      * primary (block 0) and secondary (block 1-15) bootstraps
	      * as found in /usr/mdec.	These are returned when using
	      * getdiskbyname(3) to retrieve the values from /etc/disktab.
	      */
     #if defined(KERNEL) || defined(STANDALONE)
	     char    d_packname[16]; /* pack identifier */
     #else
	     union {
		     char      un_d_packname[16]; /* pack identifier */
		     struct {
			       char *un_d_boot0;  /* primary bootstrap name */
			       char *un_d_boot1;  /* secondary bootstrap name */
		     } un_b;
	     } d_un;
     #define d_packname   d_un.un_d_packname
     #define d_boot0	  d_un.un_b.un_d_boot0
     #define d_boot1	  d_un.un_b.un_d_boot1
     #endif   /* ! KERNEL or STANDALONE */
		      /* disk geometry: */
	     u_long   d_secsize;	     /* # of bytes per sector */
	     u_long   d_nsectors;	     /* # of data sectors per track */
	     u_long   d_ntracks;	     /* # of tracks per cylinder */
	     u_long   d_ncylinders;	     /* # of data cylinders per unit */
	     u_long   d_secpercyl;	     /* # of data sectors per cylinder */


Printed 7/27/90               June				2


DISKLABEL(5)		      1990		     DISKLABEL(5)


	     u_long   d_secperunit;	     /* # of data sectors per unit */
	     /*
	      * Spares (bad sector replacements) below
	      * are not counted in d_nsectors or d_secpercyl.
	      * Spare sectors are assumed to be physical sectors
	      * which occupy space at the end of each track and/or cylinder.
	      */
	     u_short  d_sparespertrack;      /* # of spare sectors per track */
	     u_short  d_sparespercyl;	     /* # of spare sectors per cylinder */
	     /*
	      * Alternate cylinders include maintenance, replacement,
	      * configuration description areas, etc.
	      */
	     u_long   d_acylinders;	     /* # of alt. cylinders per unit */

		      /* hardware characteristics: */
	     /*
	      * d_interleave, d_trackskew and d_cylskew describe perturbations
	      * in the media format used to compensate for a slow controller.
	      * Interleave is physical sector interleave, set up by the formatter
	      * or controller when formatting.	When interleaving is in use,
	      * logically adjacent sectors are not physically contiguous,
	      * but instead are separated by some number of sectors.
	      * It is specified as the ratio of physical sectors traversed
	      * per logical sector.  Thus an interleave of 1:1 implies contiguous
	      * layout, while 2:1 implies that logical sector 0 is separated
	      * by one sector from logical sector 1.
	      * d_trackskew is the offset of sector 0 on track N
	      * relative to sector 0 on track N-1 on the same cylinder.
	      * Finally, d_cylskew is the offset of sector 0 on cylinder N
	      * relative to sector 0 on cylinder N-1.
	      */
	     u_short  d_rpm;		     /* rotational speed */
	     u_short  d_interleave;	     /* hardware sector interleave */
	     u_short  d_trackskew;	     /* sector 0 skew, per track */
	     u_short  d_cylskew;	     /* sector 0 skew, per cylinder */
	     u_long   d_headswitch;	     /* head switch time, usec */
	     u_long   d_trkseek;	     /* track-to-track seek, usec */
	     u_long   d_flags;		     /* generic flags */
     #define NDDATA 5
	     u_long   d_drivedata[NDDATA];   /* drive-type specific information */
     #define NSPARE 5
	     u_long   d_spare[NSPARE];	     /* reserved for future use */
	     u_long   d_magic2;              /* the magic number (again) */
	     u_short  d_checksum;	     /* xor of data incl. partitions */

					     /* filesystem and partition information: */
	     u_short  d_npartitions;	     /* number of partitions in following */
	     u_long   d_bbsize;              /* size of boot area at sn0, bytes */
	     u_long   d_sbsize;              /* max size of fs superblock, bytes */
	     struct   partition {	     /* the partition table */
		     u_long   p_size;		     /* number of sectors in partition */


Printed 7/27/90               June				3


DISKLABEL(5)		      1990		     DISKLABEL(5)


		     u_long   p_offset;              /* starting sector */
		     u_long   p_fsize;		     /* filesystem basic fragment size */
		     u_char   p_fstype;              /* filesystem type, see below */
		     u_char   p_frag;		     /* filesystem fragments per block */
		     u_short  p_cpg;		     /* filesystem cylinders per group */
	     } d_partitions[MAXPARTITIONS];  /* actually may be more */
     };

     /* d_type values: */
     #define  DTYPE_SMD     1	  /* SMD, XSMD; VAX hp/up */
     #define  DTYPE_MSCP    2	  /* MSCP */
     #define  DTYPE_DEC     3	  /* other DEC (rk, rl) */
     #define  DTYPE_SCSI    4	  /* SCSI */
     #define  DTYPE_ESDI    5	  /* ESDI interface */
     #define  DTYPE_ST506   6	  /* ST506 etc. */
     #define  DTYPE_FLOPPY  10	  /* floppy */

     #ifdef DKTYPENAMES
     static char *dktypenames[] = {
	      "unknown",
	      "SMD",
	      "MSCP",
	      "old DEC",
	      "SCSI",
	      "ESDI",
	      "type 6",
	      "type 7",
	      "type 8",
	      "type 9",
	      "floppy",
	      0
     };
     #define DKMAXTYPES     (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
     #endif

     /*
      * Filesystem type and version.
      * Used to interpret other filesystem-specific
      * per-partition information.
      */
     #define  FS_UNUSED     0	  /* unused */
     #define  FS_SWAP	    1	  /* swap */
     #define  FS_V6	    2	  /* Sixth Edition */
     #define  FS_V7	    3	  /* Seventh Edition */
     #define  FS_SYSV	    4	  /* System V */
     #define  FS_V71K	    5	  /* V7 with 1K blocks (4.1, 2.9) */
     #define  FS_V8	    6	  /* Eighth Edition, 4K blocks */
     #define  FS_BSDFFS     7	  /* 4.2BSD fast file system */

     #ifdef   DKTYPENAMES
     static char *fstypenames[] = {
	      "unused",


Printed 7/27/90               June				4


DISKLABEL(5)		      1990		     DISKLABEL(5)


	      "swap",
	      "Version 6",
	      "Version 7",
	      "System V",
	      "4.1BSD",
	      "Eighth Edition",
	      "4.2BSD",
	      0
     };
     #define FSMAXTYPES     (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
     #endif

     /*
      * flags shared by various drives:
      */
     #define  D_REMOVABLE   0x01  /* removable media */
     #define  D_ECC	    0x02  /* supports ECC */
     #define  D_BADSECT     0x04  /* supports bad sector forw. */
     #define  D_RAMDISK     0x08  /* disk emulator */
     #define  D_CHAIN	    0x10  /* can do back-back transfers */

     /*
      * Drive data for SMD.
      */
     #define  d_smdflags    d_drivedata[0]
     #define  D_SSE	    0x1             /* supports skip sectoring */
     #define  d_mindist     d_drivedata[1]
     #define  d_maxdist     d_drivedata[2]
     #define  d_sdist	    d_drivedata[3]

     /*
      * Drive data for ST506.
      */
     #define d_precompcyl   d_drivedata[0]
     #define d_gap3	    d_drivedata[1]  /* used only when formatting */

     #ifndef LOCORE
     /*
      * Structure used to perform a format
      * or other raw operation, returning data
      * and/or register values.
      * Register identification and format
      * are device- and driver-dependent.
      */
     struct format_op {
	     char     *df_buf;
	     int      df_count;    /* value-result */
	     daddr_t  df_startblk;
	     int      df_reg[8];   /* result */
     };

     /*


Printed 7/27/90               June				5


DISKLABEL(5)		      1990		     DISKLABEL(5)


      * Structure used internally to retrieve
      * information about a partition on a disk.
      */
     struct partinfo {
	     struct   disklabel *disklab;
	     struct   partition *part;
     };

     /*
      * Disk-specific ioctls.
      */
		      /* get and set disklabel; DIOCGPART used internally */
     #define DIOCGDINFO     _IOR('d', 101, struct disklabel)  /* get */
     #define DIOCSDINFO     _IOW('d', 102, struct disklabel)  /* set */
     #define DIOCWDINFO     _IOW('d', 103, struct disklabel)  /* set, update disk */
     #define DIOCGPART	    _IOW('d', 104, struct partinfo)   /* get partition */

     /* do format operation, read or write */
     #define DIOCRFORMAT    _IOWR('d', 105, struct format_op)
     #define DIOCWFORMAT    _IOWR('d', 106, struct format_op)

     #define DIOCSSTEP	    _IOW('d', 107, int)               /* set step rate */
     #define DIOCSRETRIES   _IOW('d', 108, int)               /* set # of retries */
     #define DIOCWLABEL     _IOW('d', 109, int)               /* write en/disable label */

     #define DIOCSBAD	    _IOW('d', 110, struct dkbad)      /* set kernel dkbad */

     #endif LOCORE

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
     disktab(5), disklabel(8)


Printed 7/27/90               June				6
Commit	Line	Data
5eaf1089 C	1
	2
	3
	4	DISKLABEL(5) 1990 DISKLABEL(5)
	5
	6
	7
	8	N\bNA\bAM\bME\bE
	9	disklabel - disk pack label
	10
	11	S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
	12	#\b#i\bin\bnc\bcl\blu\bud\bde\be <\b<s\bsy\bys\bs/\b/d\bdi\bis\bsk\bkl\bla\bab\bbe\bel\bl.\b.h\bh>\b>
	13
	14	D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
	15	Each disk or disk pack on a system may contain a disk label
	16	which provides detailed information about the geometry of
	17	the disk and the partitions into which the disk is divided.
	18	It should be initialized when the disk is formatted, and may
	19	be changed later with the _\bd_\bi_\bs_\bk_\bl_\ba_\bb_\be_\bl(8) program. This infor-
	20	mation is used by the system disk driver and by the
	21	bootstrap program to determine how to program the drive and
	22	where to find the filesystems on the disk partitions. Addi-
	23	tional information is used by the filesystem in order to use
	24	the disk most efficiently and to locate important filesystem
	25	information. The description of each partition contains an
	26	identifier for the partition type (standard filesystem, swap
	27	area, etc.). The filesystem updates the in-core copy of the
	28	label if it contains incomplete information about the
	29	filesystem.
	30
	31	The label is located in sector number _\bL_\bA_\bB_\bE_\bL_\bS_\bE_\bC_\bT_\bO_\bR of the
	32	drive, usually sector 0 where it may be found without any
	33	information about the disk geometry. It is at an offset
	34	_\bL_\bA_\bB_\bE_\bL_\bO_\bF_\bF_\bS_\bE_\bT from the beginning of the sector, to allow room
	35	for the initial bootstrap. The disk sector containing the
	36	label is normally made read-only so that it is not acciden-
	37	tally overwritten by pack-to-pack copies or swap operations;
	38	the DIOCWLABEL _\bi_\bo_\bc_\bt_\bl, which is done as needed by the _\bd_\bi_\bs_\bk_\bl_\ba_\b-
	39	_\bb_\be_\bl(8) program.
	40
	41	A copy of the in-core label for a disk can be obtained with
	42	the DIOCGDINFO _\bi_\bo_\bc_\bt_\bl; this works with a file descriptor for
	43	a block or character (``raw'') device for any partition of
	44	the disk. The in-core copy of the label is set by the
	45	DIOCSDINFO _\bi_\bo_\bc_\bt_\bl. The offset of a partition cannot gen-
	46	erally be changed while it is open, nor can it be made
	47	smaller while it is open. One exception is that any change
	48	is allowed if no label was found on the disk, and the driver
	49	was able to construct only a skeletal label without parti-
	50	tion information. Finally, the DIOCWDINFO _\bi_\bo_\bc_\bt_\bl operation
	51	sets the in-core label and then updates the on-disk label;
	52	there must be an existing label on the disk for this opera-
	53	tion to succeed. Thus, the initial label for a disk or disk
	54	pack must be installed by writing to the raw disk. All of
	55	these operations are normally done using _\bd_\bi_\bs_\bk_\bl_\ba_\bb_\be_\bl(8).
	56
	57	The format of the disk label, as specified in
	58	<_\bs_\by_\bs/_\bd_\bi_\bs_\bk_\bl_\ba_\bb_\be_\bl._\bh>, is
	59	/*
	60
	61
	62
	63	Printed 7/27/90 June 1
	64
65
66
67
68
69
70	DISKLABEL(5) 1990 DISKLABEL(5)
71
72
73
74	* Disk description table, see disktab(5)
75	*/
76	#define DISKTAB "/etc/disktab"
77
78	/*
79	* Each disk has a label which includes information about the hardware
80	* disk geometry, filesystem partitions, and drive specific information.
81	* The label is in block 0 or 1, possibly offset from the beginning
82	* to leave room for a bootstrap, etc.
83	*/
84	#define LABELSECTOR 0 /* sector containing label */
85	#define LABELOFFSET 64 /* offset of label in sector */
86	#define DISKMAGIC ((u_long) 0x82564557) /* The disk magic number */
87	#ifndef MAXPARTITIONS
88	#define MAXPARTITIONS 8
89	#endif
90
91
92	#ifndef LOCORE
93	struct disklabel {
94	u_long d_magic; /* the magic number */
95	short d_type; /* drive type */
96	short d_subtype; /* controller/d_type specific */
97	char d_typename[16]; /* type name, e.g. "eagle" */
98	/*
99	* d_packname contains the pack identifier and is returned when
100	* the disklabel is read off the disk or in-core copy.
101	* d_boot0 and d_boot1 are the (optional) names of the
102	* primary (block 0) and secondary (block 1-15) bootstraps
103	* as found in /usr/mdec. These are returned when using
104	* getdiskbyname(3) to retrieve the values from /etc/disktab.
105	*/
106	#if defined(KERNEL) \|\| defined(STANDALONE)
107	char d_packname[16]; /* pack identifier */
108	#else
109	union {
110	char un_d_packname[16]; /* pack identifier */
111	struct {
112	char un_d_boot0; / primary bootstrap name */
113	char un_d_boot1; / secondary bootstrap name */
114	} un_b;
115	} d_un;
116	#define d_packname d_un.un_d_packname
117	#define d_boot0 d_un.un_b.un_d_boot0
118	#define d_boot1 d_un.un_b.un_d_boot1
119	#endif /* ! KERNEL or STANDALONE */
120	/* disk geometry: */
121	u_long d_secsize; /* # of bytes per sector */
122	u_long d_nsectors; /* # of data sectors per track */
123	u_long d_ntracks; /* # of tracks per cylinder */
124	u_long d_ncylinders; /* # of data cylinders per unit */
125	u_long d_secpercyl; /* # of data sectors per cylinder */
126
127
128
129	Printed 7/27/90 June 2
130
131
132
133
134
135
136	DISKLABEL(5) 1990 DISKLABEL(5)
137
138
139
140	u_long d_secperunit; /* # of data sectors per unit */
141	/*
142	* Spares (bad sector replacements) below
143	* are not counted in d_nsectors or d_secpercyl.
144	* Spare sectors are assumed to be physical sectors
145	* which occupy space at the end of each track and/or cylinder.
146	*/
147	u_short d_sparespertrack; /* # of spare sectors per track */
148	u_short d_sparespercyl; /* # of spare sectors per cylinder */
149	/*
150	* Alternate cylinders include maintenance, replacement,
151	* configuration description areas, etc.
152	*/
153	u_long d_acylinders; /* # of alt. cylinders per unit */
154
155	/* hardware characteristics: */
156	/*
157	* d_interleave, d_trackskew and d_cylskew describe perturbations
158	* in the media format used to compensate for a slow controller.
159	* Interleave is physical sector interleave, set up by the formatter
160	* or controller when formatting. When interleaving is in use,
161	* logically adjacent sectors are not physically contiguous,
162	* but instead are separated by some number of sectors.
163	* It is specified as the ratio of physical sectors traversed
164	* per logical sector. Thus an interleave of 1:1 implies contiguous
165	* layout, while 2:1 implies that logical sector 0 is separated
166	* by one sector from logical sector 1.
167	* d_trackskew is the offset of sector 0 on track N
168	* relative to sector 0 on track N-1 on the same cylinder.
169	* Finally, d_cylskew is the offset of sector 0 on cylinder N
170	* relative to sector 0 on cylinder N-1.
171	*/
172	u_short d_rpm; /* rotational speed */
173	u_short d_interleave; /* hardware sector interleave */
174	u_short d_trackskew; /* sector 0 skew, per track */
175	u_short d_cylskew; /* sector 0 skew, per cylinder */
176	u_long d_headswitch; /* head switch time, usec */
177	u_long d_trkseek; /* track-to-track seek, usec */
178	u_long d_flags; /* generic flags */
179	#define NDDATA 5
180	u_long d_drivedata[NDDATA]; /* drive-type specific information */
181	#define NSPARE 5
182	u_long d_spare[NSPARE]; /* reserved for future use */
183	u_long d_magic2; /* the magic number (again) */
184	u_short d_checksum; /* xor of data incl. partitions */
185
186	/* filesystem and partition information: */
187	u_short d_npartitions; /* number of partitions in following */
188	u_long d_bbsize; /* size of boot area at sn0, bytes */
189	u_long d_sbsize; /* max size of fs superblock, bytes */
190	struct partition { /* the partition table */
191	u_long p_size; /* number of sectors in partition */
192
193
194
195	Printed 7/27/90 June 3
196
197
198
199
200
201
202	DISKLABEL(5) 1990 DISKLABEL(5)
203
204
205
206	u_long p_offset; /* starting sector */
207	u_long p_fsize; /* filesystem basic fragment size */
208	u_char p_fstype; /* filesystem type, see below */
209	u_char p_frag; /* filesystem fragments per block */
210	u_short p_cpg; /* filesystem cylinders per group */
211	} d_partitions[MAXPARTITIONS]; /* actually may be more */
212	};
213
214	/* d_type values: */
215	#define DTYPE_SMD 1 /* SMD, XSMD; VAX hp/up */
216	#define DTYPE_MSCP 2 /* MSCP */
217	#define DTYPE_DEC 3 /* other DEC (rk, rl) */
218	#define DTYPE_SCSI 4 /* SCSI */
219	#define DTYPE_ESDI 5 /* ESDI interface */
220	#define DTYPE_ST506 6 /* ST506 etc. */
221	#define DTYPE_FLOPPY 10 /* floppy */
222
223	#ifdef DKTYPENAMES
224	static char *dktypenames[] = {
225	"unknown",
226	"SMD",
227	"MSCP",
228	"old DEC",
229	"SCSI",
230	"ESDI",
231	"type 6",
232	"type 7",
233	"type 8",
234	"type 9",
235	"floppy",
236	0
237	};
238	#define DKMAXTYPES (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
239	#endif
240
241	/*
242	* Filesystem type and version.
243	* Used to interpret other filesystem-specific
244	* per-partition information.
245	*/
246	#define FS_UNUSED 0 /* unused */
247	#define FS_SWAP 1 /* swap */
248	#define FS_V6 2 /* Sixth Edition */
249	#define FS_V7 3 /* Seventh Edition */
250	#define FS_SYSV 4 /* System V */
251	#define FS_V71K 5 /* V7 with 1K blocks (4.1, 2.9) */
252	#define FS_V8 6 /* Eighth Edition, 4K blocks */
253	#define FS_BSDFFS 7 /* 4.2BSD fast file system */
254
255	#ifdef DKTYPENAMES
256	static char *fstypenames[] = {
257	"unused",
258
259
260
261	Printed 7/27/90 June 4
262
263
264
265
266
267
268	DISKLABEL(5) 1990 DISKLABEL(5)
269
270
271
272	"swap",
273	"Version 6",
274	"Version 7",
275	"System V",
276	"4.1BSD",
277	"Eighth Edition",
278	"4.2BSD",
279	0
280	};
281	#define FSMAXTYPES (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
282	#endif
283
284	/*
285	* flags shared by various drives:
286	*/
287	#define D_REMOVABLE 0x01 /* removable media */
288	#define D_ECC 0x02 /* supports ECC */
289	#define D_BADSECT 0x04 /* supports bad sector forw. */
290	#define D_RAMDISK 0x08 /* disk emulator */
291	#define D_CHAIN 0x10 /* can do back-back transfers */
292
293	/*
294	* Drive data for SMD.
295	*/
296	#define d_smdflags d_drivedata[0]
297	#define D_SSE 0x1 /* supports skip sectoring */
298	#define d_mindist d_drivedata[1]
299	#define d_maxdist d_drivedata[2]
300	#define d_sdist d_drivedata[3]
301
302	/*
303	* Drive data for ST506.
304	*/
305	#define d_precompcyl d_drivedata[0]
306	#define d_gap3 d_drivedata[1] /* used only when formatting */
307
308	#ifndef LOCORE
309	/*
310	* Structure used to perform a format
311	* or other raw operation, returning data
312	* and/or register values.
313	* Register identification and format
314	* are device- and driver-dependent.
315	*/
316	struct format_op {
317	char *df_buf;
318	int df_count; /* value-result */
319	daddr_t df_startblk;
320	int df_reg[8]; /* result */
321	};
322
323	/*
324
325
326
327	Printed 7/27/90 June 5
328
329
330
331
332
333
334	DISKLABEL(5) 1990 DISKLABEL(5)
335
336
337
338	* Structure used internally to retrieve
339	* information about a partition on a disk.
340	*/
341	struct partinfo {
342	struct disklabel *disklab;
343	struct partition *part;
344	};
345
346	/*
347	* Disk-specific ioctls.
348	*/
349	/* get and set disklabel; DIOCGPART used internally */
350	#define DIOCGDINFO _IOR('d', 101, struct disklabel) /* get */
351	#define DIOCSDINFO _IOW('d', 102, struct disklabel) /* set */
352	#define DIOCWDINFO _IOW('d', 103, struct disklabel) /* set, update disk */
353	#define DIOCGPART _IOW('d', 104, struct partinfo) /* get partition */
354
355	/* do format operation, read or write */
356	#define DIOCRFORMAT _IOWR('d', 105, struct format_op)
357	#define DIOCWFORMAT _IOWR('d', 106, struct format_op)
358
359	#define DIOCSSTEP _IOW('d', 107, int) /* set step rate */
360	#define DIOCSRETRIES _IOW('d', 108, int) /* set # of retries */
361	#define DIOCWLABEL _IOW('d', 109, int) /* write en/disable label */
362
363	#define DIOCSBAD _IOW('d', 110, struct dkbad) /* set kernel dkbad */
364
365	#endif LOCORE
366
367	S\bSE\bEE\bE A\bAL\bLS\bSO\bO
368	disktab(5), disklabel(8)
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393	Printed 7/27/90 June 6
394
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396