The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/cam/cam.c

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    1 /*-
    2  * Generic utility routines for the Common Access Method layer.
    3  *
    4  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    5  *
    6  * Copyright (c) 1997 Justin T. Gibbs.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions, and the following disclaimer,
   14  *    without modification, immediately at the beginning of the file.
   15  * 2. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/12/sys/cam/cam.c 326265 2017-11-27 15:12:43Z pfg $");
   33 
   34 #include <sys/param.h>
   35 #ifdef _KERNEL
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/sysctl.h>
   39 #else /* _KERNEL */
   40 #include <stdlib.h>
   41 #include <stdio.h>
   42 #include <string.h>
   43 #include <camlib.h>
   44 #endif /* _KERNEL */
   45 
   46 #include <cam/cam.h>
   47 #include <cam/cam_ccb.h>
   48 #include <cam/scsi/scsi_all.h>
   49 #include <cam/scsi/smp_all.h>
   50 #include <sys/sbuf.h>
   51 
   52 #ifdef _KERNEL
   53 #include <sys/libkern.h>
   54 #include <cam/cam_queue.h>
   55 #include <cam/cam_xpt.h>
   56 
   57 FEATURE(scbus, "SCSI devices support");
   58 
   59 #endif
   60 
   61 static int      camstatusentrycomp(const void *key, const void *member);
   62 
   63 const struct cam_status_entry cam_status_table[] = {
   64         { CAM_REQ_INPROG,        "CCB request is in progress"                },
   65         { CAM_REQ_CMP,           "CCB request completed without error"       },
   66         { CAM_REQ_ABORTED,       "CCB request aborted by the host"           },
   67         { CAM_UA_ABORT,          "Unable to abort CCB request"               },
   68         { CAM_REQ_CMP_ERR,       "CCB request completed with an error"       },
   69         { CAM_BUSY,              "CAM subsystem is busy"                     },
   70         { CAM_REQ_INVALID,       "CCB request was invalid"                   },
   71         { CAM_PATH_INVALID,      "Supplied Path ID is invalid"               },
   72         { CAM_DEV_NOT_THERE,     "Device Not Present"                        },
   73         { CAM_UA_TERMIO,         "Unable to terminate I/O CCB request"       },
   74         { CAM_SEL_TIMEOUT,       "Selection Timeout"                         },
   75         { CAM_CMD_TIMEOUT,       "Command timeout"                           },
   76         { CAM_SCSI_STATUS_ERROR, "SCSI Status Error"                         },
   77         { CAM_MSG_REJECT_REC,    "Message Reject Reveived"                   },
   78         { CAM_SCSI_BUS_RESET,    "SCSI Bus Reset Sent/Received"              },
   79         { CAM_UNCOR_PARITY,      "Uncorrectable parity/CRC error"            },
   80         { CAM_AUTOSENSE_FAIL,    "Auto-Sense Retrieval Failed"               },
   81         { CAM_NO_HBA,            "No HBA Detected"                           },
   82         { CAM_DATA_RUN_ERR,      "Data Overrun error"                        },
   83         { CAM_UNEXP_BUSFREE,     "Unexpected Bus Free"                       },
   84         { CAM_SEQUENCE_FAIL,     "Target Bus Phase Sequence Failure"         },
   85         { CAM_CCB_LEN_ERR,       "CCB length supplied is inadequate"         },
   86         { CAM_PROVIDE_FAIL,      "Unable to provide requested capability"    },
   87         { CAM_BDR_SENT,          "SCSI BDR Message Sent"                     },
   88         { CAM_REQ_TERMIO,        "CCB request terminated by the host"        },
   89         { CAM_UNREC_HBA_ERROR,   "Unrecoverable Host Bus Adapter Error"      },
   90         { CAM_REQ_TOO_BIG,       "The request was too large for this host"   },
   91         { CAM_REQUEUE_REQ,       "Unconditionally Re-queue Request",         },
   92         { CAM_ATA_STATUS_ERROR,  "ATA Status Error"                          },
   93         { CAM_SCSI_IT_NEXUS_LOST,"Initiator/Target Nexus Lost"               },
   94         { CAM_SMP_STATUS_ERROR,  "SMP Status Error"                          },
   95         { CAM_IDE,               "Initiator Detected Error Message Received" },
   96         { CAM_RESRC_UNAVAIL,     "Resource Unavailable"                      },
   97         { CAM_UNACKED_EVENT,     "Unacknowledged Event by Host"              },
   98         { CAM_MESSAGE_RECV,      "Message Received in Host Target Mode"      },
   99         { CAM_INVALID_CDB,       "Invalid CDB received in Host Target Mode"  },
  100         { CAM_LUN_INVALID,       "Invalid Lun"                               },
  101         { CAM_TID_INVALID,       "Invalid Target ID"                         },
  102         { CAM_FUNC_NOTAVAIL,     "Function Not Available"                    },
  103         { CAM_NO_NEXUS,          "Nexus Not Established"                     },
  104         { CAM_IID_INVALID,       "Invalid Initiator ID"                      },
  105         { CAM_CDB_RECVD,         "CDB Received"                              },
  106         { CAM_LUN_ALRDY_ENA,     "LUN Already Enabled for Target Mode"       },
  107         { CAM_SCSI_BUSY,         "SCSI Bus Busy"                             },
  108 };
  109 
  110 #ifdef _KERNEL
  111 SYSCTL_NODE(_kern, OID_AUTO, cam, CTLFLAG_RD, 0, "CAM Subsystem");
  112 
  113 #ifndef CAM_DEFAULT_SORT_IO_QUEUES
  114 #define CAM_DEFAULT_SORT_IO_QUEUES 1
  115 #endif
  116 
  117 int cam_sort_io_queues = CAM_DEFAULT_SORT_IO_QUEUES;
  118 SYSCTL_INT(_kern_cam, OID_AUTO, sort_io_queues, CTLFLAG_RWTUN,
  119     &cam_sort_io_queues, 0, "Sort IO queues to try and optimise disk access patterns");
  120 #endif
  121 
  122 void
  123 cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen)
  124 {
  125 
  126         /* Trim leading/trailing spaces, nulls. */
  127         while (srclen > 0 && src[0] == ' ')
  128                 src++, srclen--;
  129         while (srclen > 0
  130             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
  131                 srclen--;
  132 
  133         while (srclen > 0 && dstlen > 1) {
  134                 u_int8_t *cur_pos = dst;
  135 
  136                 if (*src < 0x20 || *src >= 0x80) {
  137                         /* SCSI-II Specifies that these should never occur. */
  138                         /* non-printable character */
  139                         if (dstlen > 4) {
  140                                 *cur_pos++ = '\\';
  141                                 *cur_pos++ = ((*src & 0300) >> 6) + '';
  142                                 *cur_pos++ = ((*src & 0070) >> 3) + '';
  143                                 *cur_pos++ = ((*src & 0007) >> 0) + '';
  144                         } else {
  145                                 *cur_pos++ = '?';
  146                         }
  147                 } else {
  148                         /* normal character */
  149                         *cur_pos++ = *src;
  150                 }
  151                 src++;
  152                 srclen--;
  153                 dstlen -= cur_pos - dst;
  154                 dst = cur_pos;
  155         }
  156         *dst = '\0';
  157 }
  158 
  159 void
  160 cam_strvis_sbuf(struct sbuf *sb, const u_int8_t *src, int srclen,
  161                 uint32_t flags)
  162 {
  163 
  164         /* Trim leading/trailing spaces, nulls. */
  165         while (srclen > 0 && src[0] == ' ')
  166                 src++, srclen--;
  167         while (srclen > 0
  168             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
  169                 srclen--;
  170 
  171         while (srclen > 0) {
  172                 if (*src < 0x20 || *src >= 0x80) {
  173                         /* SCSI-II Specifies that these should never occur. */
  174                         /* non-printable character */
  175                         switch (flags & CAM_STRVIS_FLAG_NONASCII_MASK) {
  176                         case CAM_STRVIS_FLAG_NONASCII_ESC:
  177                                 sbuf_printf(sb, "\\%c%c%c", 
  178                                     ((*src & 0300) >> 6) + '',
  179                                     ((*src & 0070) >> 3) + '',
  180                                     ((*src & 0007) >> 0) + '');
  181                                 break;
  182                         case CAM_STRVIS_FLAG_NONASCII_RAW:
  183                                 /*
  184                                  * If we run into a NUL, just transform it
  185                                  * into a space.
  186                                  */
  187                                 if (*src != 0x00)
  188                                         sbuf_putc(sb, *src);
  189                                 else
  190                                         sbuf_putc(sb, ' ');
  191                                 break;
  192                         case CAM_STRVIS_FLAG_NONASCII_SPC:
  193                                 sbuf_putc(sb, ' ');
  194                                 break;
  195                         case CAM_STRVIS_FLAG_NONASCII_TRIM:
  196                         default:
  197                                 break;
  198                         }
  199                 } else {
  200                         /* normal character */
  201                         sbuf_putc(sb, *src);
  202                 }
  203                 src++;
  204                 srclen--;
  205         }
  206 }
  207 
  208 
  209 /*
  210  * Compare string with pattern, returning 0 on match.
  211  * Short pattern matches trailing blanks in name,
  212  * Shell globbing rules apply: * matches 0 or more characters,
  213  * ? matchces one character, [...] denotes a set to match one char,
  214  * [^...] denotes a complimented set to match one character.
  215  * Spaces in str used to match anything in the pattern string
  216  * but was removed because it's a bug. No current patterns require
  217  * it, as far as I know, but it's impossible to know what drives
  218  * returned.
  219  *
  220  * Each '*' generates recursion, so keep the number of * in check.
  221  */
  222 int
  223 cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len)
  224 {
  225 
  226         while (*pattern != '\0' && str_len > 0) {  
  227                 if (*pattern == '*') {
  228                         pattern++;
  229                         if (*pattern == '\0')
  230                                 return (0);
  231                         do {
  232                                 if (cam_strmatch(str, pattern, str_len) == 0)
  233                                         return (0);
  234                                 str++;
  235                                 str_len--;
  236                         } while (str_len > 0);
  237                         return (1);
  238                 } else if (*pattern == '[') {
  239                         int negate_range, ok;
  240                         uint8_t pc = UCHAR_MAX;
  241                         uint8_t sc;
  242 
  243                         ok = 0;
  244                         sc = *str++;
  245                         str_len--;
  246                         pattern++;
  247                         if ((negate_range = (*pattern == '^')) != 0)
  248                                 pattern++;
  249                         while ((*pattern != ']') && *pattern != '\0') {
  250                                 if (*pattern == '-') {
  251                                         if (pattern[1] == '\0') /* Bad pattern */
  252                                                 return (1);
  253                                         if (sc >= pc && sc <= pattern[1])
  254                                                 ok = 1;
  255                                         pattern++;
  256                                 } else if (*pattern == sc)
  257                                         ok = 1;
  258                                 pc = *pattern;
  259                                 pattern++;
  260                         }
  261                         if (ok == negate_range)
  262                                 return (1);
  263                         pattern++;
  264                 } else if (*pattern == '?') {
  265                         /*
  266                          * NB: || *str == ' ' of the old code is a bug and was
  267                          * removed.  If you add it back, keep this the last if
  268                          * before the naked else */
  269                         pattern++;
  270                         str++;
  271                         str_len--;
  272                 } else {
  273                         if (*str != *pattern)
  274                                 return (1);
  275                         pattern++;
  276                         str++;
  277                         str_len--;
  278                 }
  279         }
  280 
  281         /* '*' is allowed to match nothing, so gobble it */
  282         while (*pattern == '*')
  283                 pattern++;
  284 
  285         if ( *pattern != '\0') {
  286                 /* Pattern not fully consumed.  Not a match */
  287                 return (1);
  288         }
  289 
  290         /* Eat trailing spaces, which get added by SAT */
  291         while (str_len > 0 && *str == ' ') {
  292                 str++;
  293                 str_len--;
  294         }
  295 
  296         return (str_len);
  297 }
  298 
  299 caddr_t
  300 cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
  301                int entry_size, cam_quirkmatch_t *comp_func)
  302 {
  303         for (; num_entries > 0; num_entries--, quirk_table += entry_size) {
  304                 if ((*comp_func)(target, quirk_table) == 0)
  305                         return (quirk_table);
  306         }
  307         return (NULL);
  308 }
  309 
  310 const struct cam_status_entry*
  311 cam_fetch_status_entry(cam_status status)
  312 {
  313         status &= CAM_STATUS_MASK;
  314         return (bsearch(&status, &cam_status_table,
  315                         nitems(cam_status_table),
  316                         sizeof(*cam_status_table),
  317                         camstatusentrycomp));
  318 }
  319 
  320 static int
  321 camstatusentrycomp(const void *key, const void *member)
  322 {
  323         cam_status status;
  324         const struct cam_status_entry *table_entry;
  325 
  326         status = *(const cam_status *)key;
  327         table_entry = (const struct cam_status_entry *)member;
  328 
  329         return (status - table_entry->status_code);
  330 }
  331 
  332 
  333 #ifdef _KERNEL
  334 char *
  335 cam_error_string(union ccb *ccb, char *str, int str_len,
  336                  cam_error_string_flags flags,
  337                  cam_error_proto_flags proto_flags)
  338 #else /* !_KERNEL */
  339 char *
  340 cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
  341                  int str_len, cam_error_string_flags flags,
  342                  cam_error_proto_flags proto_flags)
  343 #endif /* _KERNEL/!_KERNEL */
  344 {
  345         char path_str[64];
  346         struct sbuf sb;
  347 
  348         if ((ccb == NULL)
  349          || (str == NULL)
  350          || (str_len <= 0))
  351                 return(NULL);
  352 
  353         if (flags == CAM_ESF_NONE)
  354                 return(NULL);
  355 
  356         switch (ccb->ccb_h.func_code) {
  357                 case XPT_ATA_IO:
  358                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  359                         case CAM_EPF_NONE:
  360                                 break;
  361                         case CAM_EPF_ALL:
  362                         case CAM_EPF_NORMAL:
  363                                 proto_flags |= CAM_EAF_PRINT_RESULT;
  364                                 /* FALLTHROUGH */
  365                         case CAM_EPF_MINIMAL:
  366                                 proto_flags |= CAM_EAF_PRINT_STATUS;
  367                                 /* FALLTHROUGH */
  368                         default:
  369                                 break;
  370                         }
  371                         break;
  372                 case XPT_SCSI_IO:
  373                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  374                         case CAM_EPF_NONE:
  375                                 break;
  376                         case CAM_EPF_ALL:
  377                         case CAM_EPF_NORMAL:
  378                                 proto_flags |= CAM_ESF_PRINT_SENSE;
  379                                 /* FALLTHROUGH */
  380                         case CAM_EPF_MINIMAL:
  381                                 proto_flags |= CAM_ESF_PRINT_STATUS;
  382                                 /* FALLTHROUGH */
  383                         default:
  384                                 break;
  385                         }
  386                         break;
  387                 case XPT_SMP_IO:
  388                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  389                         case CAM_EPF_NONE:
  390                                 break;
  391                         case CAM_EPF_ALL:
  392                                 proto_flags |= CAM_ESMF_PRINT_FULL_CMD;
  393                                 /* FALLTHROUGH */
  394                         case CAM_EPF_NORMAL:
  395                         case CAM_EPF_MINIMAL:
  396                                 proto_flags |= CAM_ESMF_PRINT_STATUS;
  397                                 /* FALLTHROUGH */
  398                         default:
  399                                 break;
  400                         }
  401                         break;
  402                 default:
  403                         break;
  404         }
  405 #ifdef _KERNEL
  406         xpt_path_string(ccb->csio.ccb_h.path, path_str, sizeof(path_str));
  407 #else /* !_KERNEL */
  408         cam_path_string(device, path_str, sizeof(path_str));
  409 #endif /* _KERNEL/!_KERNEL */
  410 
  411         sbuf_new(&sb, str, str_len, 0);
  412 
  413         if (flags & CAM_ESF_COMMAND) {
  414                 sbuf_cat(&sb, path_str);
  415                 switch (ccb->ccb_h.func_code) {
  416                 case XPT_ATA_IO:
  417                         ata_command_sbuf(&ccb->ataio, &sb);
  418                         sbuf_printf(&sb, "\n");
  419                         break;
  420                 case XPT_SCSI_IO:
  421 #ifdef _KERNEL
  422                         scsi_command_string(&ccb->csio, &sb);
  423 #else /* !_KERNEL */
  424                         scsi_command_string(device, &ccb->csio, &sb);
  425 #endif /* _KERNEL/!_KERNEL */
  426                         sbuf_printf(&sb, "\n");
  427                         break;
  428                 case XPT_SMP_IO:
  429                         smp_command_sbuf(&ccb->smpio, &sb, path_str, 79 -
  430                                          strlen(path_str), (proto_flags &
  431                                          CAM_ESMF_PRINT_FULL_CMD) ? 79 : 0);
  432                         sbuf_printf(&sb, "\n");
  433                         break;
  434                 default:
  435                         break;
  436                 }
  437         }
  438 
  439         if (flags & CAM_ESF_CAM_STATUS) {
  440                 cam_status status;
  441                 const struct cam_status_entry *entry;
  442 
  443                 sbuf_cat(&sb, path_str);
  444   
  445                 status = ccb->ccb_h.status & CAM_STATUS_MASK;
  446 
  447                 entry = cam_fetch_status_entry(status);
  448 
  449                 if (entry == NULL)
  450                         sbuf_printf(&sb, "CAM status: Unknown (%#x)\n",
  451                                     ccb->ccb_h.status);
  452                 else
  453                         sbuf_printf(&sb, "CAM status: %s\n",
  454                                     entry->status_text);
  455         }
  456 
  457         if (flags & CAM_ESF_PROTO_STATUS) {
  458   
  459                 switch (ccb->ccb_h.func_code) {
  460                 case XPT_ATA_IO:
  461                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  462                              CAM_ATA_STATUS_ERROR)
  463                                 break;
  464                         if (proto_flags & CAM_EAF_PRINT_STATUS) {
  465                                 sbuf_cat(&sb, path_str);
  466                                 ata_status_sbuf(&ccb->ataio, &sb);
  467                                 sbuf_printf(&sb, "\n");
  468                         }
  469                         if (proto_flags & CAM_EAF_PRINT_RESULT) {
  470                                 sbuf_cat(&sb, path_str);
  471                                 sbuf_printf(&sb, "RES: ");
  472                                 ata_res_sbuf(&ccb->ataio.res, &sb);
  473                                 sbuf_printf(&sb, "\n");
  474                         }
  475 
  476                         break;
  477                 case XPT_SCSI_IO:
  478                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  479                              CAM_SCSI_STATUS_ERROR)
  480                                 break;
  481 
  482                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
  483                                 sbuf_cat(&sb, path_str);
  484                                 sbuf_printf(&sb, "SCSI status: %s\n",
  485                                             scsi_status_string(&ccb->csio));
  486                         }
  487 
  488                         if ((proto_flags & CAM_ESF_PRINT_SENSE)
  489                          && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
  490                          && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)) {
  491 
  492 #ifdef _KERNEL
  493                                 scsi_sense_sbuf(&ccb->csio, &sb,
  494                                                 SSS_FLAG_NONE);
  495 #else /* !_KERNEL */
  496                                 scsi_sense_sbuf(device, &ccb->csio, &sb,
  497                                                 SSS_FLAG_NONE);
  498 #endif /* _KERNEL/!_KERNEL */
  499                         }
  500                         break;
  501                 case XPT_SMP_IO:
  502                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  503                              CAM_SMP_STATUS_ERROR)
  504                                 break;
  505 
  506                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
  507                                 sbuf_cat(&sb, path_str);
  508                                 sbuf_printf(&sb, "SMP status: %s (%#x)\n",
  509                                     smp_error_desc(ccb->smpio.smp_response[2]),
  510                                                    ccb->smpio.smp_response[2]);
  511                         }
  512                         /* There is no SMP equivalent to SCSI sense. */
  513                         break;
  514                 default:
  515                         break;
  516                 }
  517         }
  518 
  519         sbuf_finish(&sb);
  520 
  521         return(sbuf_data(&sb));
  522 }
  523 
  524 #ifdef _KERNEL
  525 
  526 void
  527 cam_error_print(union ccb *ccb, cam_error_string_flags flags,
  528                 cam_error_proto_flags proto_flags)
  529 {
  530         char str[512];
  531 
  532         printf("%s", cam_error_string(ccb, str, sizeof(str), flags,
  533                proto_flags));
  534 }
  535 
  536 #else /* !_KERNEL */
  537 
  538 void
  539 cam_error_print(struct cam_device *device, union ccb *ccb,
  540                 cam_error_string_flags flags, cam_error_proto_flags proto_flags,
  541                 FILE *ofile)
  542 {
  543         char str[512];
  544 
  545         if ((device == NULL) || (ccb == NULL) || (ofile == NULL))
  546                 return;
  547 
  548         fprintf(ofile, "%s", cam_error_string(device, ccb, str, sizeof(str),
  549                 flags, proto_flags));
  550 }
  551 
  552 #endif /* _KERNEL/!_KERNEL */
  553 
  554 /*
  555  * Common calculate geometry fuction
  556  *
  557  * Caller should set ccg->volume_size and block_size.
  558  * The extended parameter should be zero if extended translation
  559  * should not be used.
  560  */
  561 void
  562 cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
  563 {
  564         uint32_t size_mb, secs_per_cylinder;
  565 
  566         if (ccg->block_size == 0) {
  567                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  568                 return;
  569         }
  570         size_mb = (1024L * 1024L) / ccg->block_size;
  571         if (size_mb == 0) {
  572                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  573                 return;
  574         }
  575         size_mb = ccg->volume_size / size_mb;
  576         if (size_mb > 1024 && extended) {
  577                 ccg->heads = 255;
  578                 ccg->secs_per_track = 63;
  579         } else {
  580                 ccg->heads = 64;
  581                 ccg->secs_per_track = 32;
  582         }
  583         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
  584         if (secs_per_cylinder == 0) {
  585                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  586                 return;
  587         }
  588         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
  589         ccg->ccb_h.status = CAM_REQ_CMP;
  590 }

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