The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/cam/cam.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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: releng/11.0/sys/cam/cam.c 298411 2016-04-21 15:38:28Z pfg $");
   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) + '';
  140                                 *cur_pos++ = ((*src & 0070) >> 3) + '';
  141                                 *cur_pos++ = ((*src & 0007) >> 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) + '',
  177                                     ((*src & 0070) >> 3) + '',
  178                                     ((*src & 0007) >> 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  * wildcard '*' in pattern matches rest of name,
  211  * wildcard '?' matches a single non-space character.
  212  */
  213 int
  214 cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len)
  215 {
  216 
  217         while (*pattern != '\0'&& str_len > 0) {  
  218 
  219                 if (*pattern == '*') {
  220                         return (0);
  221                 }
  222                 if ((*pattern != *str)
  223                  && (*pattern != '?' || *str == ' ')) {
  224                         return (1);
  225                 }
  226                 pattern++;
  227                 str++;
  228                 str_len--;
  229         }
  230         while (str_len > 0 && *str == ' ') {
  231                 str++;
  232                 str_len--;
  233         }
  234         if (str_len > 0 && *str == 0)
  235                 str_len = 0;
  236 
  237         return (str_len);
  238 }
  239 
  240 caddr_t
  241 cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
  242                int entry_size, cam_quirkmatch_t *comp_func)
  243 {
  244         for (; num_entries > 0; num_entries--, quirk_table += entry_size) {
  245                 if ((*comp_func)(target, quirk_table) == 0)
  246                         return (quirk_table);
  247         }
  248         return (NULL);
  249 }
  250 
  251 const struct cam_status_entry*
  252 cam_fetch_status_entry(cam_status status)
  253 {
  254         status &= CAM_STATUS_MASK;
  255         return (bsearch(&status, &cam_status_table,
  256                         nitems(cam_status_table),
  257                         sizeof(*cam_status_table),
  258                         camstatusentrycomp));
  259 }
  260 
  261 static int
  262 camstatusentrycomp(const void *key, const void *member)
  263 {
  264         cam_status status;
  265         const struct cam_status_entry *table_entry;
  266 
  267         status = *(const cam_status *)key;
  268         table_entry = (const struct cam_status_entry *)member;
  269 
  270         return (status - table_entry->status_code);
  271 }
  272 
  273 
  274 #ifdef _KERNEL
  275 char *
  276 cam_error_string(union ccb *ccb, char *str, int str_len,
  277                  cam_error_string_flags flags,
  278                  cam_error_proto_flags proto_flags)
  279 #else /* !_KERNEL */
  280 char *
  281 cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
  282                  int str_len, cam_error_string_flags flags,
  283                  cam_error_proto_flags proto_flags)
  284 #endif /* _KERNEL/!_KERNEL */
  285 {
  286         char path_str[64];
  287         struct sbuf sb;
  288 
  289         if ((ccb == NULL)
  290          || (str == NULL)
  291          || (str_len <= 0))
  292                 return(NULL);
  293 
  294         if (flags == CAM_ESF_NONE)
  295                 return(NULL);
  296 
  297         switch (ccb->ccb_h.func_code) {
  298                 case XPT_ATA_IO:
  299                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  300                         case CAM_EPF_NONE:
  301                                 break;
  302                         case CAM_EPF_ALL:
  303                         case CAM_EPF_NORMAL:
  304                                 proto_flags |= CAM_EAF_PRINT_RESULT;
  305                                 /* FALLTHROUGH */
  306                         case CAM_EPF_MINIMAL:
  307                                 proto_flags |= CAM_EAF_PRINT_STATUS;
  308                                 /* FALLTHROUGH */
  309                         default:
  310                                 break;
  311                         }
  312                         break;
  313                 case XPT_SCSI_IO:
  314                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  315                         case CAM_EPF_NONE:
  316                                 break;
  317                         case CAM_EPF_ALL:
  318                         case CAM_EPF_NORMAL:
  319                                 proto_flags |= CAM_ESF_PRINT_SENSE;
  320                                 /* FALLTHROUGH */
  321                         case CAM_EPF_MINIMAL:
  322                                 proto_flags |= CAM_ESF_PRINT_STATUS;
  323                                 /* FALLTHROUGH */
  324                         default:
  325                                 break;
  326                         }
  327                         break;
  328                 case XPT_SMP_IO:
  329                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  330                         case CAM_EPF_NONE:
  331                                 break;
  332                         case CAM_EPF_ALL:
  333                                 proto_flags |= CAM_ESMF_PRINT_FULL_CMD;
  334                                 /* FALLTHROUGH */
  335                         case CAM_EPF_NORMAL:
  336                         case CAM_EPF_MINIMAL:
  337                                 proto_flags |= CAM_ESMF_PRINT_STATUS;
  338                                 /* FALLTHROUGH */
  339                         default:
  340                                 break;
  341                         }
  342                         break;
  343                 default:
  344                         break;
  345         }
  346 #ifdef _KERNEL
  347         xpt_path_string(ccb->csio.ccb_h.path, path_str, sizeof(path_str));
  348 #else /* !_KERNEL */
  349         cam_path_string(device, path_str, sizeof(path_str));
  350 #endif /* _KERNEL/!_KERNEL */
  351 
  352         sbuf_new(&sb, str, str_len, 0);
  353 
  354         if (flags & CAM_ESF_COMMAND) {
  355                 sbuf_cat(&sb, path_str);
  356                 switch (ccb->ccb_h.func_code) {
  357                 case XPT_ATA_IO:
  358                         ata_command_sbuf(&ccb->ataio, &sb);
  359                         sbuf_printf(&sb, "\n");
  360                         break;
  361                 case XPT_SCSI_IO:
  362 #ifdef _KERNEL
  363                         scsi_command_string(&ccb->csio, &sb);
  364 #else /* !_KERNEL */
  365                         scsi_command_string(device, &ccb->csio, &sb);
  366 #endif /* _KERNEL/!_KERNEL */
  367                         sbuf_printf(&sb, "\n");
  368                         break;
  369                 case XPT_SMP_IO:
  370                         smp_command_sbuf(&ccb->smpio, &sb, path_str, 79 -
  371                                          strlen(path_str), (proto_flags &
  372                                          CAM_ESMF_PRINT_FULL_CMD) ? 79 : 0);
  373                         sbuf_printf(&sb, "\n");
  374                         break;
  375                 default:
  376                         break;
  377                 }
  378         }
  379 
  380         if (flags & CAM_ESF_CAM_STATUS) {
  381                 cam_status status;
  382                 const struct cam_status_entry *entry;
  383 
  384                 sbuf_cat(&sb, path_str);
  385   
  386                 status = ccb->ccb_h.status & CAM_STATUS_MASK;
  387 
  388                 entry = cam_fetch_status_entry(status);
  389 
  390                 if (entry == NULL)
  391                         sbuf_printf(&sb, "CAM status: Unknown (%#x)\n",
  392                                     ccb->ccb_h.status);
  393                 else
  394                         sbuf_printf(&sb, "CAM status: %s\n",
  395                                     entry->status_text);
  396         }
  397 
  398         if (flags & CAM_ESF_PROTO_STATUS) {
  399   
  400                 switch (ccb->ccb_h.func_code) {
  401                 case XPT_ATA_IO:
  402                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  403                              CAM_ATA_STATUS_ERROR)
  404                                 break;
  405                         if (proto_flags & CAM_EAF_PRINT_STATUS) {
  406                                 sbuf_cat(&sb, path_str);
  407                                 ata_status_sbuf(&ccb->ataio, &sb);
  408                                 sbuf_printf(&sb, "\n");
  409                         }
  410                         if (proto_flags & CAM_EAF_PRINT_RESULT) {
  411                                 sbuf_cat(&sb, path_str);
  412                                 sbuf_printf(&sb, "RES: ");
  413                                 ata_res_sbuf(&ccb->ataio.res, &sb);
  414                                 sbuf_printf(&sb, "\n");
  415                         }
  416 
  417                         break;
  418                 case XPT_SCSI_IO:
  419                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  420                              CAM_SCSI_STATUS_ERROR)
  421                                 break;
  422 
  423                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
  424                                 sbuf_cat(&sb, path_str);
  425                                 sbuf_printf(&sb, "SCSI status: %s\n",
  426                                             scsi_status_string(&ccb->csio));
  427                         }
  428 
  429                         if ((proto_flags & CAM_ESF_PRINT_SENSE)
  430                          && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
  431                          && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)) {
  432 
  433 #ifdef _KERNEL
  434                                 scsi_sense_sbuf(&ccb->csio, &sb,
  435                                                 SSS_FLAG_NONE);
  436 #else /* !_KERNEL */
  437                                 scsi_sense_sbuf(device, &ccb->csio, &sb,
  438                                                 SSS_FLAG_NONE);
  439 #endif /* _KERNEL/!_KERNEL */
  440                         }
  441                         break;
  442                 case XPT_SMP_IO:
  443                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  444                              CAM_SMP_STATUS_ERROR)
  445                                 break;
  446 
  447                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
  448                                 sbuf_cat(&sb, path_str);
  449                                 sbuf_printf(&sb, "SMP status: %s (%#x)\n",
  450                                     smp_error_desc(ccb->smpio.smp_response[2]),
  451                                                    ccb->smpio.smp_response[2]);
  452                         }
  453                         /* There is no SMP equivalent to SCSI sense. */
  454                         break;
  455                 default:
  456                         break;
  457                 }
  458         }
  459 
  460         sbuf_finish(&sb);
  461 
  462         return(sbuf_data(&sb));
  463 }
  464 
  465 #ifdef _KERNEL
  466 
  467 void
  468 cam_error_print(union ccb *ccb, cam_error_string_flags flags,
  469                 cam_error_proto_flags proto_flags)
  470 {
  471         char str[512];
  472 
  473         printf("%s", cam_error_string(ccb, str, sizeof(str), flags,
  474                proto_flags));
  475 }
  476 
  477 #else /* !_KERNEL */
  478 
  479 void
  480 cam_error_print(struct cam_device *device, union ccb *ccb,
  481                 cam_error_string_flags flags, cam_error_proto_flags proto_flags,
  482                 FILE *ofile)
  483 {
  484         char str[512];
  485 
  486         if ((device == NULL) || (ccb == NULL) || (ofile == NULL))
  487                 return;
  488 
  489         fprintf(ofile, "%s", cam_error_string(device, ccb, str, sizeof(str),
  490                 flags, proto_flags));
  491 }
  492 
  493 #endif /* _KERNEL/!_KERNEL */
  494 
  495 /*
  496  * Common calculate geometry fuction
  497  *
  498  * Caller should set ccg->volume_size and block_size.
  499  * The extended parameter should be zero if extended translation
  500  * should not be used.
  501  */
  502 void
  503 cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
  504 {
  505         uint32_t size_mb, secs_per_cylinder;
  506 
  507         if (ccg->block_size == 0) {
  508                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  509                 return;
  510         }
  511         size_mb = (1024L * 1024L) / ccg->block_size;
  512         if (size_mb == 0) {
  513                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  514                 return;
  515         }
  516         size_mb = ccg->volume_size / size_mb;
  517         if (size_mb > 1024 && extended) {
  518                 ccg->heads = 255;
  519                 ccg->secs_per_track = 63;
  520         } else {
  521                 ccg->heads = 64;
  522                 ccg->secs_per_track = 32;
  523         }
  524         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
  525         if (secs_per_cylinder == 0) {
  526                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  527                 return;
  528         }
  529         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
  530         ccg->ccb_h.status = CAM_REQ_CMP;
  531 }

Cache object: 93b72ca1d818af28b8738220a80c69c2


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.