sys/cam/cam.c

   1 /*-
   2  * Generic utility routines for the Common Access Method layer.
   3  *
   4  * Copyright (c) 1997 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #ifdef _KERNEL
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/sysctl.h>
  37 #else /* _KERNEL */
  38 #include <stdlib.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <camlib.h>
  42 #endif /* _KERNEL */
  43
  44 #include <cam/cam.h>
  45 #include <cam/cam_ccb.h>
  46 #include <cam/scsi/scsi_all.h>
  47 #include <cam/scsi/smp_all.h>
  48 #include <sys/sbuf.h>
  49
  50 #ifdef _KERNEL
  51 #include <sys/libkern.h>
  52 #include <cam/cam_queue.h>
  53 #include <cam/cam_xpt.h>
  54
  55 FEATURE(scbus, "SCSI devices support");
  56
  57 #endif
  58
  59 static int      camstatusentrycomp(const void *key, const void *member);
  60
  61 const struct cam_status_entry cam_status_table[] = {
  62         { CAM_REQ_INPROG,        "CCB request is in progress"                },
  63         { CAM_REQ_CMP,           "CCB request completed without error"       },
  64         { CAM_REQ_ABORTED,       "CCB request aborted by the host"           },
  65         { CAM_UA_ABORT,          "Unable to abort CCB request"               },
  66         { CAM_REQ_CMP_ERR,       "CCB request completed with an error"       },
  67         { CAM_BUSY,              "CAM subsystem is busy"                     },
  68         { CAM_REQ_INVALID,       "CCB request was invalid"                   },
  69         { CAM_PATH_INVALID,      "Supplied Path ID is invalid"               },
  70         { CAM_DEV_NOT_THERE,     "Device Not Present"                        },
  71         { CAM_UA_TERMIO,         "Unable to terminate I/O CCB request"       },
  72         { CAM_SEL_TIMEOUT,       "Selection Timeout"                         },
  73         { CAM_CMD_TIMEOUT,       "Command timeout"                           },
  74         { CAM_SCSI_STATUS_ERROR, "SCSI Status Error"                         },
  75         { CAM_MSG_REJECT_REC,    "Message Reject Reveived"                   },
  76         { CAM_SCSI_BUS_RESET,    "SCSI Bus Reset Sent/Received"              },
  77         { CAM_UNCOR_PARITY,      "Uncorrectable parity/CRC error"            },
  78         { CAM_AUTOSENSE_FAIL,    "Auto-Sense Retrieval Failed"               },
  79         { CAM_NO_HBA,            "No HBA Detected"                           },
  80         { CAM_DATA_RUN_ERR,      "Data Overrun error"                        },
  81         { CAM_UNEXP_BUSFREE,     "Unexpected Bus Free"                       },
  82         { CAM_SEQUENCE_FAIL,     "Target Bus Phase Sequence Failure"         },
  83         { CAM_CCB_LEN_ERR,       "CCB length supplied is inadequate"         },
  84         { CAM_PROVIDE_FAIL,      "Unable to provide requested capability"    },
  85         { CAM_BDR_SENT,          "SCSI BDR Message Sent"                     },
  86         { CAM_REQ_TERMIO,        "CCB request terminated by the host"        },
  87         { CAM_UNREC_HBA_ERROR,   "Unrecoverable Host Bus Adapter Error"      },
  88         { CAM_REQ_TOO_BIG,       "The request was too large for this host"   },
  89         { CAM_REQUEUE_REQ,       "Unconditionally Re-queue Request",         },
  90         { CAM_ATA_STATUS_ERROR,  "ATA Status Error"                          },
  91         { CAM_SCSI_IT_NEXUS_LOST,"Initiator/Target Nexus Lost"               },
  92         { CAM_SMP_STATUS_ERROR,  "SMP Status Error"                          },
  93         { CAM_IDE,               "Initiator Detected Error Message Received" },
  94         { CAM_RESRC_UNAVAIL,     "Resource Unavailable"                      },
  95         { CAM_UNACKED_EVENT,     "Unacknowledged Event by Host"              },
  96         { CAM_MESSAGE_RECV,      "Message Received in Host Target Mode"      },
  97         { CAM_INVALID_CDB,       "Invalid CDB received in Host Target Mode"  },
  98         { CAM_LUN_INVALID,       "Invalid Lun"                               },
  99         { CAM_TID_INVALID,       "Invalid Target ID"                         },
 100         { CAM_FUNC_NOTAVAIL,     "Function Not Available"                    },
 101         { CAM_NO_NEXUS,          "Nexus Not Established"                     },
 102         { CAM_IID_INVALID,       "Invalid Initiator ID"                      },
 103         { CAM_CDB_RECVD,         "CDB Received"                              },
 104         { CAM_LUN_ALRDY_ENA,     "LUN Already Enabled for Target Mode"       },
 105         { CAM_SCSI_BUSY,         "SCSI Bus Busy"                             },
 106 };
 107
 108 #ifdef _KERNEL
 109 SYSCTL_NODE(_kern, OID_AUTO, cam, CTLFLAG_RD, 0, "CAM Subsystem");
 110
 111 #ifndef CAM_DEFAULT_SORT_IO_QUEUES
 112 #define CAM_DEFAULT_SORT_IO_QUEUES 1
 113 #endif
 114
 115 int cam_sort_io_queues = CAM_DEFAULT_SORT_IO_QUEUES;
 116 SYSCTL_INT(_kern_cam, OID_AUTO, sort_io_queues, CTLFLAG_RWTUN,
 117     &cam_sort_io_queues, 0, "Sort IO queues to try and optimise disk access patterns");
 118 #endif
 119
 120 void
 121 cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen)
 122 {
 123
 124         /* Trim leading/trailing spaces, nulls. */
 125         while (srclen > 0 && src[0] == ' ')
 126                 src++, srclen--;
 127         while (srclen > 0
 128             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
 129                 srclen--;
 130
 131         while (srclen > 0 && dstlen > 1) {
 132                 u_int8_t *cur_pos = dst;
 133
 134                 if (*src < 0x20 || *src >= 0x80) {
 135                         /* SCSI-II Specifies that these should never occur. */
 136                         /* non-printable character */
 137                         if (dstlen > 4) {
 138                                 *cur_pos++ = '\\';
 139                                 *cur_pos++ = ((*src & 0300) >> 6) + '0';
 140                                 *cur_pos++ = ((*src & 0070) >> 3) + '0';
 141                                 *cur_pos++ = ((*src & 0007) >> 0) + '0';
 142                         } else {
 143                                 *cur_pos++ = '?';
 144                         }
 145                 } else {
 146                         /* normal character */
 147                         *cur_pos++ = *src;
 148                 }
 149                 src++;
 150                 srclen--;
 151                 dstlen -= cur_pos - dst;
 152                 dst = cur_pos;
 153         }
 154         *dst = '\0';
 155 }
 156
 157 void
 158 cam_strvis_sbuf(struct sbuf *sb, const u_int8_t *src, int srclen,
 159                 uint32_t flags)
 160 {
 161
 162         /* Trim leading/trailing spaces, nulls. */
 163         while (srclen > 0 && src[0] == ' ')
 164                 src++, srclen--;
 165         while (srclen > 0
 166             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
 167                 srclen--;
 168
 169         while (srclen > 0) {
 170                 if (*src < 0x20 || *src >= 0x80) {
 171                         /* SCSI-II Specifies that these should never occur. */
 172                         /* non-printable character */
 173                         switch (flags & CAM_STRVIS_FLAG_NONASCII_MASK) {
 174                         case CAM_STRVIS_FLAG_NONASCII_ESC:
 175                                 sbuf_printf(sb, "\\%c%c%c",
 176                                     ((*src & 0300) >> 6) + '0',
 177                                     ((*src & 0070) >> 3) + '0',
 178                                     ((*src & 0007) >> 0) + '0');
 179                                 break;
 180                         case CAM_STRVIS_FLAG_NONASCII_RAW:
 181                                 /*
 182                                  * If we run into a NUL, just transform it
 183                                  * into a space.
 184                                  */
 185                                 if (*src != 0x00)
 186                                         sbuf_putc(sb, *src);
 187                                 else
 188                                         sbuf_putc(sb, ' ');
 189                                 break;
 190                         case CAM_STRVIS_FLAG_NONASCII_SPC:
 191                                 sbuf_putc(sb, ' ');
 192                                 break;
 193                         case CAM_STRVIS_FLAG_NONASCII_TRIM:
 194                         default:
 195                                 break;
 196                         }
 197                 } else {
 198                         /* normal character */
 199                         sbuf_putc(sb, *src);
 200                 }
 201                 src++;
 202                 srclen--;
 203         }
 204 }
 205
 206
 207 /*
 208  * Compare string with pattern, returning 0 on match.
 209  * Short pattern matches trailing blanks in name,
 210  * Shell globbing rules apply: * matches 0 or more characters,
 211  * ? matchces one character, [...] denotes a set to match one char,
 212  * [^...] denotes a complimented set to match one character.
 213  * Spaces in str used to match anything in the pattern string
 214  * but was removed because it's a bug. No current patterns require
 215  * it, as far as I know, but it's impossible to know what drives
 216  * returned.
 217  *
 218  * Each '*' generates recursion, so keep the number of * in check.
 219  */
 220 int
 221 cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len)
 222 {
 223
 224         while (*pattern != '\0' && str_len > 0) {
 225                 if (*pattern == '*') {
 226                         pattern++;
 227                         if (*pattern == '\0')
 228                                 return (0);
 229                         do {
 230                                 if (cam_strmatch(str, pattern, str_len) == 0)
 231                                         return (0);
 232                                 str++;
 233                                 str_len--;
 234                         } while (str_len > 0);
 235                         return (1);
 236                 } else if (*pattern == '[') {
 237                         int negate_range, ok;
 238                         uint8_t pc = UCHAR_MAX;
 239                         uint8_t sc;
 240
 241                         ok = 0;
 242                         sc = *str++;
 243                         str_len--;
 244                         pattern++;
 245                         if ((negate_range = (*pattern == '^')) != 0)
 246                                 pattern++;
 247                         while ((*pattern != ']') && *pattern != '\0') {
 248                                 if (*pattern == '-') {
 249                                         if (pattern[1] == '\0') /* Bad pattern */
 250                                                 return (1);
 251                                         if (sc >= pc && sc <= pattern[1])
 252                                                 ok = 1;
 253                                         pattern++;
 254                                 } else if (*pattern == sc)
 255                                         ok = 1;
 256                                 pc = *pattern;
 257                                 pattern++;
 258                         }
 259                         if (ok == negate_range)
 260                                 return (1);
 261                         pattern++;
 262                 } else if (*pattern == '?') {
 263                         /*
 264                          * NB: || *str == ' ' of the old code is a bug and was
 265                          * removed.  If you add it back, keep this the last if
 266                          * before the naked else */
 267                         pattern++;
 268                         str++;
 269                         str_len--;
 270                 } else {
 271                         if (*str != *pattern)
 272                                 return (1);
 273                         pattern++;
 274                         str++;
 275                         str_len--;
 276                 }
 277         }
 278
 279         /* '*' is allowed to match nothing, so gobble it */
 280         while (*pattern == '*')
 281                 pattern++;
 282
 283         if ( *pattern != '\0') {
 284                 /* Pattern not fully consumed.  Not a match */
 285                 return (1);
 286         }
 287
 288         /* Eat trailing spaces, which get added by SAT */
 289         while (str_len > 0 && *str == ' ') {
 290                 str++;
 291                 str_len--;
 292         }
 293
 294         return (str_len);
 295 }
 296
 297 caddr_t
 298 cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
 299                int entry_size, cam_quirkmatch_t *comp_func)
 300 {
 301         for (; num_entries > 0; num_entries--, quirk_table += entry_size) {
 302                 if ((*comp_func)(target, quirk_table) == 0)
 303                         return (quirk_table);
 304         }
 305         return (NULL);
 306 }
 307
 308 const struct cam_status_entry*
 309 cam_fetch_status_entry(cam_status status)
 310 {
 311         status &= CAM_STATUS_MASK;
 312         return (bsearch(&status, &cam_status_table,
 313                         nitems(cam_status_table),
 314                         sizeof(*cam_status_table),
 315                         camstatusentrycomp));
 316 }
 317
 318 static int
 319 camstatusentrycomp(const void *key, const void *member)
 320 {
 321         cam_status status;
 322         const struct cam_status_entry *table_entry;
 323
 324         status = *(const cam_status *)key;
 325         table_entry = (const struct cam_status_entry *)member;
 326
 327         return (status - table_entry->status_code);
 328 }
 329
 330
 331 #ifdef _KERNEL
 332 char *
 333 cam_error_string(union ccb *ccb, char *str, int str_len,
 334                  cam_error_string_flags flags,
 335                  cam_error_proto_flags proto_flags)
 336 #else /* !_KERNEL */
 337 char *
 338 cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
 339                  int str_len, cam_error_string_flags flags,
 340                  cam_error_proto_flags proto_flags)
 341 #endif /* _KERNEL/!_KERNEL */
 342 {
 343         char path_str[64];
 344         struct sbuf sb;
 345
 346         if ((ccb == NULL)
 347          || (str == NULL)
 348          || (str_len <= 0))
 349                 return(NULL);
 350
 351         if (flags == CAM_ESF_NONE)
 352                 return(NULL);
 353
 354         switch (ccb->ccb_h.func_code) {
 355                 case XPT_ATA_IO:
 356                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 357                         case CAM_EPF_NONE:
 358                                 break;
 359                         case CAM_EPF_ALL:
 360                         case CAM_EPF_NORMAL:
 361                                 proto_flags |= CAM_EAF_PRINT_RESULT;
 362                                 /* FALLTHROUGH */
 363                         case CAM_EPF_MINIMAL:
 364                                 proto_flags |= CAM_EAF_PRINT_STATUS;
 365                                 /* FALLTHROUGH */
 366                         default:
 367                                 break;
 368                         }
 369                         break;
 370                 case XPT_SCSI_IO:
 371                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 372                         case CAM_EPF_NONE:
 373                                 break;
 374                         case CAM_EPF_ALL:
 375                         case CAM_EPF_NORMAL:
 376                                 proto_flags |= CAM_ESF_PRINT_SENSE;
 377                                 /* FALLTHROUGH */
 378                         case CAM_EPF_MINIMAL:
 379                                 proto_flags |= CAM_ESF_PRINT_STATUS;
 380                                 /* FALLTHROUGH */
 381                         default:
 382                                 break;
 383                         }
 384                         break;
 385                 case XPT_SMP_IO:
 386                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 387                         case CAM_EPF_NONE:
 388                                 break;
 389                         case CAM_EPF_ALL:
 390                                 proto_flags |= CAM_ESMF_PRINT_FULL_CMD;
 391                                 /* FALLTHROUGH */
 392                         case CAM_EPF_NORMAL:
 393                         case CAM_EPF_MINIMAL:
 394                                 proto_flags |= CAM_ESMF_PRINT_STATUS;
 395                                 /* FALLTHROUGH */
 396                         default:
 397                                 break;
 398                         }
 399                         break;
 400                 default:
 401                         break;
 402         }
 403 #ifdef _KERNEL
 404         xpt_path_string(ccb->csio.ccb_h.path, path_str, sizeof(path_str));
 405 #else /* !_KERNEL */
 406         cam_path_string(device, path_str, sizeof(path_str));
 407 #endif /* _KERNEL/!_KERNEL */
 408
 409         sbuf_new(&sb, str, str_len, 0);
 410
 411         if (flags & CAM_ESF_COMMAND) {
 412                 sbuf_cat(&sb, path_str);
 413                 switch (ccb->ccb_h.func_code) {
 414                 case XPT_ATA_IO:
 415                         ata_command_sbuf(&ccb->ataio, &sb);
 416                         sbuf_printf(&sb, "\n");
 417                         break;
 418                 case XPT_SCSI_IO:
 419 #ifdef _KERNEL
 420                         scsi_command_string(&ccb->csio, &sb);
 421 #else /* !_KERNEL */
 422                         scsi_command_string(device, &ccb->csio, &sb);
 423 #endif /* _KERNEL/!_KERNEL */
 424                         sbuf_printf(&sb, "\n");
 425                         break;
 426                 case XPT_SMP_IO:
 427                         smp_command_sbuf(&ccb->smpio, &sb, path_str, 79 -
 428                                          strlen(path_str), (proto_flags &
 429                                          CAM_ESMF_PRINT_FULL_CMD) ? 79 : 0);
 430                         sbuf_printf(&sb, "\n");
 431                         break;
 432                 default:
 433                         break;
 434                 }
 435         }
 436
 437         if (flags & CAM_ESF_CAM_STATUS) {
 438                 cam_status status;
 439                 const struct cam_status_entry *entry;
 440
 441                 sbuf_cat(&sb, path_str);
 442
 443                 status = ccb->ccb_h.status & CAM_STATUS_MASK;
 444
 445                 entry = cam_fetch_status_entry(status);
 446
 447                 if (entry == NULL)
 448                         sbuf_printf(&sb, "CAM status: Unknown (%#x)\n",
 449                                     ccb->ccb_h.status);
 450                 else
 451                         sbuf_printf(&sb, "CAM status: %s\n",
 452                                     entry->status_text);
 453         }
 454
 455         if (flags & CAM_ESF_PROTO_STATUS) {
 456
 457                 switch (ccb->ccb_h.func_code) {
 458                 case XPT_ATA_IO:
 459                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 460                              CAM_ATA_STATUS_ERROR)
 461                                 break;
 462                         if (proto_flags & CAM_EAF_PRINT_STATUS) {
 463                                 sbuf_cat(&sb, path_str);
 464                                 ata_status_sbuf(&ccb->ataio, &sb);
 465                                 sbuf_printf(&sb, "\n");
 466                         }
 467                         if (proto_flags & CAM_EAF_PRINT_RESULT) {
 468                                 sbuf_cat(&sb, path_str);
 469                                 sbuf_printf(&sb, "RES: ");
 470                                 ata_res_sbuf(&ccb->ataio.res, &sb);
 471                                 sbuf_printf(&sb, "\n");
 472                         }
 473
 474                         break;
 475                 case XPT_SCSI_IO:
 476                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 477                              CAM_SCSI_STATUS_ERROR)
 478                                 break;
 479
 480                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
 481                                 sbuf_cat(&sb, path_str);
 482                                 sbuf_printf(&sb, "SCSI status: %s\n",
 483                                             scsi_status_string(&ccb->csio));
 484                         }
 485
 486                         if ((proto_flags & CAM_ESF_PRINT_SENSE)
 487                          && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
 488                          && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)) {
 489
 490 #ifdef _KERNEL
 491                                 scsi_sense_sbuf(&ccb->csio, &sb,
 492                                                 SSS_FLAG_NONE);
 493 #else /* !_KERNEL */
 494                                 scsi_sense_sbuf(device, &ccb->csio, &sb,
 495                                                 SSS_FLAG_NONE);
 496 #endif /* _KERNEL/!_KERNEL */
 497                         }
 498                         break;
 499                 case XPT_SMP_IO:
 500                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 501                              CAM_SMP_STATUS_ERROR)
 502                                 break;
 503
 504                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
 505                                 sbuf_cat(&sb, path_str);
 506                                 sbuf_printf(&sb, "SMP status: %s (%#x)\n",
 507                                     smp_error_desc(ccb->smpio.smp_response[2]),
 508                                                    ccb->smpio.smp_response[2]);
 509                         }
 510                         /* There is no SMP equivalent to SCSI sense. */
 511                         break;
 512                 default:
 513                         break;
 514                 }
 515         }
 516
 517         sbuf_finish(&sb);
 518
 519         return(sbuf_data(&sb));
 520 }
 521
 522 #ifdef _KERNEL
 523
 524 void
 525 cam_error_print(union ccb *ccb, cam_error_string_flags flags,
 526                 cam_error_proto_flags proto_flags)
 527 {
 528         char str[512];
 529
 530         printf("%s", cam_error_string(ccb, str, sizeof(str), flags,
 531                proto_flags));
 532 }
 533
 534 #else /* !_KERNEL */
 535
 536 void
 537 cam_error_print(struct cam_device *device, union ccb *ccb,
 538                 cam_error_string_flags flags, cam_error_proto_flags proto_flags,
 539                 FILE *ofile)
 540 {
 541         char str[512];
 542
 543         if ((device == NULL) || (ccb == NULL) || (ofile == NULL))
 544                 return;
 545
 546         fprintf(ofile, "%s", cam_error_string(device, ccb, str, sizeof(str),
 547                 flags, proto_flags));
 548 }
 549
 550 #endif /* _KERNEL/!_KERNEL */
 551
 552 /*
 553  * Common calculate geometry fuction
 554  *
 555  * Caller should set ccg->volume_size and block_size.
 556  * The extended parameter should be zero if extended translation
 557  * should not be used.
 558  */
 559 void
 560 cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
 561 {
 562         uint32_t size_mb, secs_per_cylinder;
 563
 564         if (ccg->block_size == 0) {
 565                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 566                 return;
 567         }
 568         size_mb = (1024L * 1024L) / ccg->block_size;
 569         if (size_mb == 0) {
 570                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 571                 return;
 572         }
 573         size_mb = ccg->volume_size / size_mb;
 574         if (size_mb > 1024 && extended) {
 575                 ccg->heads = 255;
 576                 ccg->secs_per_track = 63;
 577         } else {
 578                 ccg->heads = 64;
 579                 ccg->secs_per_track = 32;
 580         }
 581         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
 582         if (secs_per_cylinder == 0) {
 583                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 584                 return;
 585         }
 586         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
 587         ccg->ccb_h.status = CAM_REQ_CMP;
 588 }