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All Sun disk drivers support a set of ioctl.2 requests for disk formatting and labeling operations. Basic to these ioctl() requests are the definitions in /usr/include/sun/dkio.h:
/*
* Structures and definitions for disk I/O control commands
*/
/* Controller and disk identification */
struct dk_info {
int dki_ctlr; /* controller address */
short dki_unit; /* unit (slave) address */
short dki_ctype; /* controller type */
short dki_flags; /* flags */
};
/* controller types */
#define DKC_UNKNOWN 0
#define DKC_DSD5215 5
#define DKC_XY450 6
#define DKC_ACB4000 7
#define DKC_MD21 8
#define DKC_XD7053 11
#define DKC_CSS 12
#define DKC_NEC765 13 /* floppy on Sun386i */
#define DKC_INTEL82072 14
/* flags */
#define DKI_BAD144 0x01 /* use DEC std 144 bad sector fwding */
#define DKI_MAPTRK 0x02 /* controller does track mapping */
#define DKI_FMTTRK 0x04 /* formats only full track at a time */
#define DKI_FMTVOL 0x08 /* formats only full volume at a time */
/* Definition of a disk's geometry */
struct dk_geom {
unsigned short dkg_ncyl; /* # of data cylinders */
unsigned short dkg_acyl; /* # of alternate cylinders */
unsigned short dkg_bcyl; /* cyl offset (for fixed head area) */
unsigned short dkg_nhead; /* # of heads */
unsigned short dkg_bhead; /* head offset (for Larks, etc.) */
unsigned short dkg_nsect; /* # of sectors per track */
unsigned short dkg_intrlv; /* interleave factor */
unsigned short dkg_gap1; /* gap 1 size */
unsigned short dkg_gap2; /* gap 2 size */
unsigned short dkg_apc; /* alternates per cyl (SCSI only) */
unsigned short dkg_extra[9]; /* for compatible expansion */
};
/* Partition map (part of dk_label) */
struct dk_map {
long dkl_cylno; /* starting cylinder */
long dkl_nblk; /* number of blocks */
};
/* Floppy characteristics */
struct fdk_char {
u_char medium; /* medium type (scsi floppy only) */
int transfer_rate; /* transfer rate */
int ncyl; /* number of cylinders */
int nhead; /* number of heads */
int sec_size; /* sector size */
int secptrack; /* sectors per track */
int steps; /* number of steps per */
};
/* Used by FDKGETCHANGE, returned state of the sense disk change bit. */
#define FDKGC_HISTORY 0x01 /* disk has changed since last call */
#define FDKGC_CURRENT 0x02 /* current state of disk change */
/* disk I/O control commands */
#define DKIOCINFO _IOR(d, 8, struct dk_info) /* Get info */
#define DKIOCGGEOM _IOR(d, 2, struct dk_geom) /* Get geometry */
#define DKIOCSGEOM _IOW(d, 3, struct dk_geom) /* Set geometry */
#define DKIOCGPART _IOR(d, 4, struct dk_map) /* Get partition info */
#define DKIOCSPART _IOW(d, 5, struct dk_map) /* Set partition info */
#define DKIOCWCHK _IOWR(d, 115, int) /* Toggle write check */
/* floppy I/O control commands */
#define FDKIOGCHAR _IOR(d, 114, struct fdk_char) /* Get floppy characteristics */
#define FDKEJECT _IO(d, 112) /* Eject floppy */
#define FDKGETCHANGE _IOR(d, 111, int) /* Get disk change status */
The DKIOCINFO ioctl returns a dk_info structure which tells the type of the controller and attributes about how bad-block processing is done on the controller. The DKIOCGPART and DKIOCSPART get and set the controller's current notion of the partition table for the disk (without changing the partition table on the disk itself), while the DKIOCGGEOM and DKIOCSGEOM ioctls do similar things for the per-drive geometry information. The DKIOCWCHK enables or disables a disk's write check capabilities. The FDKIOGCHAR ioctl returns an fdk_char structure which gives the characteristics of the floppy diskette. The FDKEJECT ioctl ejects the floppy diskette. The FDKGETCHANGE returns the status of the diskette changed signal from the floppy interface.
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Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97