1 /* 2 * Copyright (c) 1982 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)saio.h 6.4 (Berkeley) 11/08/85 7 */ 8 9 /* 10 * Header file for standalone package 11 */ 12 13 /* 14 * Io block: includes an 15 * inode, cells for the use of seek, etc, 16 * and a buffer. 17 */ 18 struct iob { 19 int i_flgs; /* see F_ below */ 20 struct inode i_ino; /* inode, if file */ 21 int i_unit; /* pseudo device unit */ 22 daddr_t i_boff; /* block offset on device */ 23 daddr_t i_cyloff; /* cylinder offset on device */ 24 off_t i_offset; /* seek offset in file */ 25 daddr_t i_bn; /* 1st block # of next read */ 26 char *i_ma; /* memory address of i/o buffer */ 27 int i_cc; /* character count of transfer */ 28 int i_error; /* error # return */ 29 int i_errcnt; /* error count for driver retries */ 30 int i_errblk; /* block # in error for error reporting */ 31 char i_buf[MAXBSIZE];/* i/o buffer */ 32 union { 33 struct fs ui_fs; /* file system super block info */ 34 char dummy[SBSIZE]; 35 } i_un; 36 }; 37 #define i_fs i_un.ui_fs 38 #define NULL 0 39 40 #define F_READ 0x1 /* file opened for reading */ 41 #define F_WRITE 0x2 /* file opened for writing */ 42 #define F_ALLOC 0x4 /* buffer allocated */ 43 #define F_FILE 0x8 /* file instead of device */ 44 #define F_NBSF 0x10 /* no bad sector forwarding */ 45 #define F_SSI 0x40 /* set skip sector inhibit */ 46 /* io types */ 47 #define F_RDDATA 0x0100 /* read data */ 48 #define F_WRDATA 0x0200 /* write data */ 49 #define F_HDR 0x0400 /* include header on next i/o */ 50 #define F_CHECK 0x0800 /* perform check of data read/write */ 51 #define F_HCHECK 0x1000 /* perform check of header and data */ 52 53 #define F_TYPEMASK 0xff00 54 55 /* 56 * Device switch. 57 */ 58 struct devsw { 59 char *dv_name; 60 int (*dv_strategy)(); 61 int (*dv_open)(); 62 int (*dv_close)(); 63 int (*dv_ioctl)(); 64 }; 65 66 struct devsw devsw[]; 67 68 /* 69 * Drive description table. 70 * Returned from SAIODEVDATA call. 71 */ 72 struct st { 73 short nsect; /* # sectors/track */ 74 short ntrak; /* # tracks/surfaces/heads */ 75 short nspc; /* # sectors/cylinder */ 76 short ncyl; /* # cylinders */ 77 short *off; /* partition offset table (cylinders) */ 78 }; 79 80 /* 81 * Request codes. Must be the same a F_XXX above 82 */ 83 #define READ 1 84 #define WRITE 2 85 86 #define NBUFS 4 87 88 char b[NBUFS][MAXBSIZE]; 89 daddr_t blknos[NBUFS]; 90 91 #define NFILES 4 92 struct iob iob[NFILES]; 93 94 extern int errno; /* just like unix */ 95 96 /* error codes */ 97 #define EBADF 1 /* bad file descriptor */ 98 #define EOFFSET 2 /* relative seek not supported */ 99 #define EDEV 3 /* improper device specification on open */ 100 #define ENXIO 4 /* unknown device specified */ 101 #define EUNIT 5 /* improper unit specification */ 102 #define ESRCH 6 /* directory search for file failed */ 103 #define EIO 7 /* generic error */ 104 #define ECMD 10 /* undefined driver command */ 105 #define EBSE 11 /* bad sector error */ 106 #define EWCK 12 /* write check error */ 107 #define EECC 13 /* uncorrectable ecc error */ 108 #define EHER 14 /* hard error */ 109 110 /* ioctl's -- for disks just now */ 111 #define SAIOHDR (('d'<<8)|1) /* next i/o includes header */ 112 #define SAIOCHECK (('d'<<8)|2) /* next i/o checks data */ 113 #define SAIOHCHECK (('d'<<8)|3) /* next i/o checks header & data */ 114 #define SAIONOBAD (('d'<<8)|4) /* inhibit bad sector forwarding */ 115 #define SAIODOBAD (('d'<<8)|5) /* enable bad sector forwarding */ 116 #define SAIOECCLIM (('d'<<8)|6) /* set limit to ecc correction, bits */ 117 #define SAIORETRIES (('d'<<8)|7) /* set retry count for unit */ 118 #define SAIODEVDATA (('d'<<8)|8) /* get device data */ 119 #define SAIOSSI (('d'<<8)|9) /* set skip sector inhibit */ 120 #define SAIONOSSI (('d'<<8)|10) /* inhibit skip sector handling */ 121 #define SAIOSSDEV (('d'<<8)|11) /* is device skip sector type? */ 122 #define SAIODEBUG (('d'<<8)|12) /* enable/disable debugging */ 123 #define SAIOGBADINFO (('d'<<8)|13) /* get bad-sector table */ 124