extras/dasd_id/dasd_id.c

   1 /*
   2  * dasdlabel - read label from s390 block device
   3  *
   4  * Copyright (C) 2004 Arnd Bergmann <arnd@arndb.de>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  */
  10
  11 #ifndef _GNU_SOURCE
  12 #define _GNU_SOURCE 1
  13 #endif
  14
  15 #ifdef HAVE_CONFIG_H
  16 #  include <config.h>
  17 #endif
  18
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <errno.h>
  25 #include <sys/ioctl.h>
  26
  27 #include "../../udev.h"
  28
  29 #ifdef USE_LOG
  30 void log_message(int priority, const char *format, ...)
  31 {
  32         va_list args;
  33         static int udev_log = -1;
  34
  35         if (udev_log == -1) {
  36                 const char *value;
  37
  38                 value = getenv("UDEV_LOG");
  39                 if (value)
  40                         udev_log = log_priority(value);
  41                 else
  42                         udev_log = LOG_ERR;
  43         }
  44
  45         if (priority > udev_log)
  46                 return;
  47
  48         va_start(args, format);
  49         vsyslog(priority, format, args);
  50         va_end(args);
  51 }
  52 #endif
  53
  54 /*
  55  * Only compile this on S/390. Doesn't make any sense
  56  * for other architectures.
  57  */
  58
  59 static unsigned char EBCtoASC[256] =
  60 {
  61 /* 0x00  NUL   SOH   STX   ETX  *SEL    HT  *RNL   DEL */
  62         0x00, 0x01, 0x02, 0x03, 0x07, 0x09, 0x07, 0x7F,
  63 /* 0x08  -GE  -SPS  -RPT    VT    FF    CR    SO    SI */
  64         0x07, 0x07, 0x07, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
  65 /* 0x10  DLE   DC1   DC2   DC3  -RES   -NL    BS  -POC
  66                                 -ENP  ->LF             */
  67         0x10, 0x11, 0x12, 0x13, 0x07, 0x0A, 0x08, 0x07,
  68 /* 0x18  CAN    EM  -UBS  -CU1  -IFS  -IGS  -IRS  -ITB
  69                                                   -IUS */
  70         0x18, 0x19, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
  71 /* 0x20  -DS  -SOS    FS  -WUS  -BYP    LF   ETB   ESC
  72                                 -INP                   */
  73         0x07, 0x07, 0x1C, 0x07, 0x07, 0x0A, 0x17, 0x1B,
  74 /* 0x28  -SA  -SFE   -SM  -CSP  -MFA   ENQ   ACK   BEL
  75                      -SW                               */
  76         0x07, 0x07, 0x07, 0x07, 0x07, 0x05, 0x06, 0x07,
  77 /* 0x30 ----  ----   SYN   -IR   -PP  -TRN  -NBS   EOT */
  78         0x07, 0x07, 0x16, 0x07, 0x07, 0x07, 0x07, 0x04,
  79 /* 0x38 -SBS   -IT  -RFF  -CU3   DC4   NAK  ----   SUB */
  80         0x07, 0x07, 0x07, 0x07, 0x14, 0x15, 0x07, 0x1A,
  81 /* 0x40   SP   RSP           ä              ----       */
  82         0x20, 0xFF, 0x83, 0x84, 0x85, 0xA0, 0x07, 0x86,
  83 /* 0x48                      .     <     (     +     | */
  84         0x87, 0xA4, 0x9B, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
  85 /* 0x50    &                                      ---- */
  86         0x26, 0x82, 0x88, 0x89, 0x8A, 0xA1, 0x8C, 0x07,
  87 /* 0x58          ß     !     $     *     )     ;       */
  88         0x8D, 0xE1, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0xAA,
  89 /* 0x60    -     /  ----     Ä  ----  ----  ----       */
  90         0x2D, 0x2F, 0x07, 0x8E, 0x07, 0x07, 0x07, 0x8F,
  91 /* 0x68             ----     ,     %     _     >     ? */
  92         0x80, 0xA5, 0x07, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
  93 /* 0x70  ---        ----  ----  ----  ----  ----  ---- */
  94         0x07, 0x90, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
  95 /* 0x78    *     `     :     #     @     '     =     " */
  96         0x70, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
  97 /* 0x80    *     a     b     c     d     e     f     g */
  98         0x07, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
  99 /* 0x88    h     i              ----  ----  ----       */
 100         0x68, 0x69, 0xAE, 0xAF, 0x07, 0x07, 0x07, 0xF1,
 101 /* 0x90    °     j     k     l     m     n     o     p */
 102         0xF8, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70,
 103 /* 0x98    q     r                    ----        ---- */
 104         0x71, 0x72, 0xA6, 0xA7, 0x91, 0x07, 0x92, 0x07,
 105 /* 0xA0          ~     s     t     u     v     w     x */
 106         0xE6, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
 107 /* 0xA8    y     z              ----  ----  ----  ---- */
 108         0x79, 0x7A, 0xAD, 0xAB, 0x07, 0x07, 0x07, 0x07,
 109 /* 0xB0    ^                    ----     §  ----       */
 110         0x5E, 0x9C, 0x9D, 0xFA, 0x07, 0x07, 0x07, 0xAC,
 111 /* 0xB8       ----     [     ]  ----  ----  ----  ---- */
 112         0xAB, 0x07, 0x5B, 0x5D, 0x07, 0x07, 0x07, 0x07,
 113 /* 0xC0    {     A     B     C     D     E     F     G */
 114         0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
 115 /* 0xC8    H     I  ----           ö              ---- */
 116         0x48, 0x49, 0x07, 0x93, 0x94, 0x95, 0xA2, 0x07,
 117 /* 0xD0    }     J     K     L     M     N     O     P */
 118         0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
 119 /* 0xD8    Q     R  ----           ü                   */
 120         0x51, 0x52, 0x07, 0x96, 0x81, 0x97, 0xA3, 0x98,
 121 /* 0xE0    \           S     T     U     V     W     X */
 122         0x5C, 0xF6, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
 123 /* 0xE8    Y     Z        ----     Ö  ----  ----  ---- */
 124         0x59, 0x5A, 0xFD, 0x07, 0x99, 0x07, 0x07, 0x07,
 125 /* 0xF0    0     1     2     3     4     5     6     7 */
 126         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
 127 /* 0xF8    8     9  ----  ----     Ü  ----  ----  ---- */
 128         0x38, 0x39, 0x07, 0x07, 0x9A, 0x07, 0x07, 0x07
 129 };
 130
 131 static void vtoc_ebcdic_dec (const unsigned char *source, unsigned char *target, int l)
 132 {
 133         int i;
 134
 135         for (i = 0; i < l; i++)
 136                 target[i]=(char)EBCtoASC[(unsigned char)(source[i])];
 137 }
 138
 139 /*
 140  * struct dasd_information_t
 141  * represents any data about the data, which is visible to userspace
 142  */
 143 typedef struct dasd_information_t {
 144         unsigned int devno;             /* S/390 devno */
 145         unsigned int real_devno;        /* for aliases */
 146         unsigned int schid;             /* S/390 subchannel identifier */
 147         unsigned int cu_type  : 16;     /* from SenseID */
 148         unsigned int cu_model :  8;     /* from SenseID */
 149         unsigned int dev_type : 16;     /* from SenseID */
 150         unsigned int dev_model : 8;     /* from SenseID */
 151         unsigned int open_count;
 152         unsigned int req_queue_len;
 153         unsigned int chanq_len;         /* length of chanq */
 154         char type[4];                   /* from discipline.name, 'none' for unknown */
 155         unsigned int status;            /* current device level */
 156         unsigned int label_block;       /* where to find the VOLSER */
 157         unsigned int FBA_layout;        /* fixed block size (like AIXVOL) */
 158         unsigned int characteristics_size;
 159         unsigned int confdata_size;
 160         char characteristics[64];       /* from read_device_characteristics */
 161         char configuration_data[256];   /* from read_configuration_data */
 162 } dasd_information_t;
 163
 164 #define DASD_IOCTL_LETTER        'D'
 165 #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
 166 #define BLKSSZGET _IO(0x12,104)
 167
 168 unsigned char serial[8];
 169
 170 static int dasd_id(int fd)
 171 {
 172         int blocksize;
 173         dasd_information_t info;
 174         unsigned char *data;
 175         unsigned char *label_raw;
 176
 177         if (ioctl(fd, BIODASDINFO, &info) != 0) {
 178                 dbg("not a dasd");
 179                 return -1;
 180         }
 181
 182                 if (ioctl(fd, BLKSSZGET, &blocksize) != 0) {
 183                         err("failed to get blocksize");
 184                         return -1;
 185                 }
 186
 187                 if (lseek(fd,info.label_block * blocksize, SEEK_SET) == -1) {
 188                         err("seek failed on dasd");
 189                         return -1;
 190                 }
 191
 192                 data = malloc(blocksize);
 193                 if (data == NULL)
 194                         return -1;
 195
 196                 if (read(fd, data, blocksize) == -1) {
 197                         err("read disklabel failed");
 198                         free(data);
 199                         return -1;
 200                 }
 201
 202                 if ((!info.FBA_layout) && (!strcmp(info.type, "ECKD")))
 203                         label_raw = &data[8];
 204                 else
 205                         label_raw = &data[4];
 206                 serial[6] = '\0';
 207
 208                 vtoc_ebcdic_dec(label_raw, serial, 6);
 209                 free(data);
 210
 211                 return 0;
 212         }
 213
 214 int main(int argc, char *argv[])
 215 {
 216         const char *node = NULL;
 217         int i;
 218         int export = 0;
 219         int fd;
 220         int rc = 0;
 221
 222         logging_init("dasd_id");
 223
 224         for (i = 1; i < argc; i++) {
 225                 char *arg = argv[i];
 226
 227                 if (strcmp(arg, "--export") == 0) {
 228                         export = 1;
 229                 } else
 230                         node = arg;
 231         }
 232         if (!node) {
 233                 err("no node specified");
 234                 rc = 1;
 235                 goto exit;
 236         }
 237
 238         fd = open(node, O_RDONLY);
 239         if (fd < 0) {
 240                 err("unable to open '%s'", node);
 241                 rc = 1;
 242                 goto exit;
 243         }
 244
 245         if (dasd_id(fd) < 0) {
 246                 err("dasd_id failed: %s", strerror(errno));
 247                 rc = 1;
 248         }
 249
 250         if (export) {
 251                 printf("ID_TYPE=disk\n");
 252                 printf("ID_SERIAL=%s\n",serial);
 253                 printf("ID_BUS=ccw\n");
 254         } else
 255                 printf("%s\n", serial);
 256
 257         close(fd);
 258 exit:
 259         logging_close();
 260         return rc;
 261 }
 262