root/drivers/scsi/scsi.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. end_scsi_request

   1 /*
   2  *  scsi.h Copyright (C) 1992 Drew Eckhardt 
   3  *  generic SCSI package header file by
   4  *      Drew Eckhardt 
   5  *
   6  *  <drew@colorado.edu>
   7  *
   8  *       Modified by Eric Youngdale eric@tantalus.nrl.navy.mil to
   9  *       add scatter-gather, multiple outstanding request, and other
  10  *       enhancements.
  11  */
  12 
  13 #ifndef _SCSI_H
  14 #define _SCSI_H
  15 
  16 /*
  17     $Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/scsi.h,v 1.3 1993/09/24 12:20:33 drew Exp $
  18 
  19     For documentation on the OPCODES, MESSAGES, and SENSE values,
  20     please consult the SCSI standard.
  21 
  22 */
  23 
  24 /*
  25  *      SCSI opcodes
  26  */
  27 
  28 #define TEST_UNIT_READY       0x00
  29 #define REZERO_UNIT           0x01
  30 #define REQUEST_SENSE         0x03
  31 #define FORMAT_UNIT           0x04
  32 #define READ_BLOCK_LIMITS     0x05
  33 #define REASSIGN_BLOCKS       0x07
  34 #define READ_6                0x08
  35 #define WRITE_6               0x0a
  36 #define SEEK_6                0x0b
  37 #define READ_REVERSE          0x0f
  38 #define WRITE_FILEMARKS       0x10
  39 #define SPACE                 0x11
  40 #define INQUIRY               0x12
  41 #define RECOVER_BUFFERED_DATA 0x14
  42 #define MODE_SELECT           0x15
  43 #define RESERVE               0x16
  44 #define RELEASE               0x17
  45 #define COPY                  0x18
  46 #define ERASE                 0x19
  47 #define MODE_SENSE            0x1a
  48 #define START_STOP            0x1b
  49 #define RECEIVE_DIAGNOSTIC    0x1c
  50 #define SEND_DIAGNOSTIC       0x1d
  51 #define ALLOW_MEDIUM_REMOVAL  0x1e
  52 
  53 #define SET_WINDOW            0x24
  54 #define READ_CAPACITY         0x25
  55 #define READ_10               0x28
  56 #define WRITE_10              0x2a
  57 #define SEEK_10               0x2b
  58 #define WRITE_VERIFY          0x2e
  59 #define VERIFY                0x2f
  60 #define SEARCH_HIGH           0x30
  61 #define SEARCH_EQUAL          0x31
  62 #define SEARCH_LOW            0x32
  63 #define SET_LIMITS            0x33
  64 #define PRE_FETCH             0x34
  65 #define READ_POSITION         0x34
  66 #define SYNCHRONIZE_CACHE     0x35
  67 #define LOCK_UNLOCK_CACHE     0x36
  68 #define READ_DEFECT_DATA      0x37
  69 #define MEDIUM_SCAN           0x38
  70 #define COMPARE               0x39
  71 #define COPY_VERIFY           0x3a
  72 #define WRITE_BUFFER          0x3b
  73 #define READ_BUFFER           0x3c
  74 #define UPDATE_BLOCK          0x3d
  75 #define READ_LONG             0x3e
  76 #define WRITE_LONG            0x3f
  77 #define CHANGE_DEFINITION     0x40
  78 #define WRITE_SAME            0x41
  79 #define LOG_SELECT            0x4c
  80 #define LOG_SENSE             0x4d
  81 #define MODE_SELECT_10        0x55
  82 #define MODE_SENSE_10         0x5a
  83 #define READ_12               0xa8
  84 #define WRITE_12              0xaa
  85 #define WRITE_VERIFY_12       0xae
  86 #define SEARCH_HIGH_12        0xb0
  87 #define SEARCH_EQUAL_12       0xb1
  88 #define SEARCH_LOW_12         0xb2
  89 #define SEND_VOLUME_TAG       0xb6
  90 #define WRITE_LONG_2          0xea
  91 
  92 extern void scsi_make_blocked_list(void);
  93 extern volatile int in_scan_scsis;
  94 extern const unsigned char scsi_command_size[8];
  95 #define COMMAND_SIZE(opcode) scsi_command_size[((opcode) >> 5) & 7]
  96 
  97 /*
  98  *  MESSAGE CODES
  99  */
 100 
 101 #define COMMAND_COMPLETE    0x00
 102 #define EXTENDED_MESSAGE    0x01
 103 #define     EXTENDED_MODIFY_DATA_POINTER    0x00
 104 #define     EXTENDED_SDTR                   0x01
 105 #define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
 106 #define     EXTENDED_WDTR                   0x03
 107 #define SAVE_POINTERS       0x02
 108 #define RESTORE_POINTERS    0x03
 109 #define DISCONNECT          0x04
 110 #define INITIATOR_ERROR     0x05
 111 #define ABORT               0x06
 112 #define MESSAGE_REJECT      0x07
 113 #define NOP                 0x08
 114 #define MSG_PARITY_ERROR    0x09
 115 #define LINKED_CMD_COMPLETE 0x0a
 116 #define LINKED_FLG_CMD_COMPLETE 0x0b
 117 #define BUS_DEVICE_RESET    0x0c
 118 
 119 #define INITIATE_RECOVERY   0x0f            /* SCSI-II only */
 120 #define RELEASE_RECOVERY    0x10            /* SCSI-II only */
 121 
 122 #define SIMPLE_QUEUE_TAG    0x20
 123 #define HEAD_OF_QUEUE_TAG   0x21
 124 #define ORDERED_QUEUE_TAG   0x22
 125 
 126 #define IDENTIFY_BASE       0x80
 127 #define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
 128                      ((can_disconnect) ?  0x40 : 0) |\
 129                      ((lun) & 0x07)) 
 130 
 131                  
 132 /*
 133  *  Status codes
 134  */
 135 
 136 #define GOOD                 0x00
 137 #define CHECK_CONDITION      0x01
 138 #define CONDITION_GOOD       0x02
 139 #define BUSY                 0x04
 140 #define INTERMEDIATE_GOOD    0x08
 141 #define INTERMEDIATE_C_GOOD  0x0a
 142 #define RESERVATION_CONFLICT 0x0c
 143 #define QUEUE_FULL           0x1a
 144 
 145 #define STATUS_MASK          0x1e
 146     
 147 /*
 148  *  the return of the status word will be in the following format :
 149  *  The low byte is the status returned by the SCSI command, 
 150  *  with vendor specific bits masked.
 151  *  
 152  *  The next byte is the message which followed the SCSI status.
 153  *  This allows a stos to be used, since the Intel is a little
 154  *  endian machine.
 155  *  
 156  *  The final byte is a host return code, which is one of the following.
 157  *  
 158  *  IE 
 159  *  lsb     msb
 160  *  status  msg host code   
 161  *  
 162  *  Our errors returned by OUR driver, NOT SCSI message.  Or'd with
 163  *  SCSI message passed back to driver <IF any>.
 164  */
 165 
 166 
 167 #define DID_OK          0x00 /* NO error                                */
 168 #define DID_NO_CONNECT  0x01 /* Couldn't connect before timeout period  */
 169 #define DID_BUS_BUSY    0x02 /* BUS stayed busy through time out period */
 170 #define DID_TIME_OUT    0x03 /* TIMED OUT for other reason              */
 171 #define DID_BAD_TARGET  0x04 /* BAD target.                             */
 172 #define DID_ABORT       0x05 /* Told to abort for some other reason     */
 173 #define DID_PARITY      0x06 /* Parity error                            */
 174 #define DID_ERROR       0x07 /* Internal error                          */
 175 #define DID_RESET       0x08 /* Reset by somebody.                      */
 176 #define DID_BAD_INTR    0x09 /* Got an interrupt we weren't expecting.  */ 
 177 #define DRIVER_OK       0x00 /* Driver status                           */ 
 178 
 179 /*
 180  *  These indicate the error that occurred, and what is available.
 181  */
 182 
 183 #define DRIVER_BUSY         0x01
 184 #define DRIVER_SOFT         0x02
 185 #define DRIVER_MEDIA        0x03
 186 #define DRIVER_ERROR        0x04    
 187 
 188 #define DRIVER_INVALID      0x05
 189 #define DRIVER_TIMEOUT      0x06
 190 #define DRIVER_HARD         0x07
 191 
 192 #define SUGGEST_RETRY       0x10
 193 #define SUGGEST_ABORT       0x20 
 194 #define SUGGEST_REMAP       0x30
 195 #define SUGGEST_DIE         0x40
 196 #define SUGGEST_SENSE       0x80
 197 #define SUGGEST_IS_OK       0xff
 198 
 199 #define DRIVER_SENSE        0x08
 200 
 201 #define DRIVER_MASK         0x0f
 202 #define SUGGEST_MASK        0xf0
 203 
 204 /*
 205  *  SENSE KEYS
 206  */
 207 
 208 #define NO_SENSE            0x00
 209 #define RECOVERED_ERROR     0x01
 210 #define NOT_READY           0x02
 211 #define MEDIUM_ERROR        0x03
 212 #define HARDWARE_ERROR      0x04
 213 #define ILLEGAL_REQUEST     0x05
 214 #define UNIT_ATTENTION      0x06
 215 #define DATA_PROTECT        0x07
 216 #define BLANK_CHECK         0x08
 217 #define COPY_ABORTED        0x0a
 218 #define ABORTED_COMMAND     0x0b
 219 #define VOLUME_OVERFLOW     0x0d
 220 #define MISCOMPARE          0x0e
 221 
 222 
 223 /*
 224  *  DEVICE TYPES
 225  */
 226 
 227 #define TYPE_DISK           0x00
 228 #define TYPE_TAPE           0x01
 229 #define TYPE_PROCESSOR      0x03    /* HP scanners use this */
 230 #define TYPE_WORM           0x04    /* Treated as ROM by our system */
 231 #define TYPE_ROM            0x05
 232 #define TYPE_SCANNER        0x06
 233 #define TYPE_MOD            0x07    /* Magneto-optical disk - 
 234                                      * - treated as TYPE_DISK */
 235 #define TYPE_NO_LUN         0x7f
 236 
 237 
 238 #define MAX_COMMAND_SIZE    12
 239 
 240 /*
 241  *  SCSI command sets
 242  */
 243 
 244 #define SCSI_UNKNOWN    0
 245 #define SCSI_1          1
 246 #define SCSI_1_CCS      2
 247 #define SCSI_2          3
 248 
 249 /*
 250  *  Every SCSI command starts with a one byte OP-code.
 251  *  The next byte's high three bits are the LUN of the
 252  *  device.  Any multi-byte quantities are stored high byte
 253  *  first, and may have a 5 bit MSB in the same byte
 254  *  as the LUN.
 255  */
 256 
 257 /*
 258  *      Manufacturers list
 259  */
 260 
 261 #define SCSI_MAN_UNKNOWN     0
 262 #define SCSI_MAN_NEC         1
 263 #define SCSI_MAN_TOSHIBA     2
 264 #define SCSI_MAN_NEC_OLDCDR  3
 265 #define SCSI_MAN_SONY        4
 266 
 267 /*
 268  *  As the scsi do command functions are intelligent, and may need to
 269  *  redo a command, we need to keep track of the last command
 270  *  executed on each one.
 271  */
 272 
 273 #define WAS_RESET       0x01
 274 #define WAS_TIMEDOUT    0x02
 275 #define WAS_SENSE       0x04
 276 #define IS_RESETTING    0x08
 277 #define IS_ABORTING     0x10
 278 #define ASKED_FOR_SENSE 0x20
 279 
 280 /*
 281  *  The scsi_device struct contains what we know about each given scsi
 282  *  device.
 283  */
 284 
 285 typedef struct scsi_device {
 286     struct scsi_device * next;      /* Used for linked list */
 287 
 288     unsigned char id, lun, channel;
 289 
 290     unsigned int manufacturer;      /* Manufacturer of device, for using 
 291                                      * vendor-specific cmd's */
 292     int attached;                   /* # of high level drivers attached to 
 293                                      * this */
 294     int access_count;               /* Count of open channels/mounts */
 295     struct wait_queue * device_wait;/* Used to wait if device is busy */
 296     struct Scsi_Host * host;
 297     void (*scsi_request_fn)(void);  /* Used to jumpstart things after an 
 298                                      * ioctl */
 299     void *hostdata;                 /* available to low-level driver */
 300     char type;
 301     char scsi_level;
 302     char vendor[8], model[16], rev[4];
 303     unsigned writeable:1;
 304     unsigned removable:1; 
 305     unsigned random:1;
 306     unsigned has_cmdblocks:1;
 307     unsigned changed:1;             /* Data invalid due to media change */
 308     unsigned busy:1;                /* Used to prevent races */
 309     unsigned lockable:1;            /* Able to prevent media removal */
 310     unsigned borken:1;              /* Tell the Seagate driver to be 
 311                                      * painfully slow on this device */ 
 312     unsigned tagged_supported:1;    /* Supports SCSI-II tagged queuing */
 313     unsigned tagged_queue:1;        /* SCSI-II tagged queuing enabled */
 314     unsigned disconnect:1;          /* can disconnect */
 315     unsigned soft_reset:1;          /* Uses soft reset option */
 316     unsigned sync:1;                /* Negotiate for sync transfers */
 317     unsigned single_lun:1;          /* Indicates we should only allow I/O to
 318                                        one of the luns for the device at a time. */
 319     unsigned char current_tag;      /* current tag */
 320     unsigned char sync_min_period;  /* Not less than this period */
 321     unsigned char sync_max_offset;  /* Not greater than this offset */
 322 } Scsi_Device;
 323 
 324 /*
 325  *  Use these to separate status msg and our bytes
 326  */
 327 
 328 #define status_byte(result) (((result) >> 1) & 0xf)
 329 #define msg_byte(result)    (((result) >> 8) & 0xff)
 330 #define host_byte(result)   (((result) >> 16) & 0xff)
 331 #define driver_byte(result) (((result) >> 24) & 0xff)
 332 #define suggestion(result)  (driver_byte(result) & SUGGEST_MASK)
 333 
 334 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 335 #define sense_error(sense)  ((sense) & 0xf)
 336 #define sense_valid(sense)  ((sense) & 0x80);
 337 
 338 /*
 339  *  These are the SCSI devices available on the system.
 340  */
 341 
 342 extern Scsi_Device * scsi_devices;
 343 
 344 /*
 345  *  Initializes all SCSI devices.  This scans all scsi busses.
 346  */ 
 347 
 348 extern unsigned long scsi_dev_init (unsigned long, unsigned long);
 349 
 350 struct scatterlist {
 351     char *  address;    /* Location data is to be transferred to */
 352     char * alt_address; /* Location of actual if address is a 
 353                          * dma indirect buffer.  NULL otherwise */
 354     unsigned int length;
 355 };
 356 
 357 #ifdef __alpha__
 358 # define ISA_DMA_THRESHOLD (~0UL)
 359 #else
 360 # define ISA_DMA_THRESHOLD (0x00ffffff)
 361 #endif
 362 #define CONTIGUOUS_BUFFERS(X,Y) ((X->b_data+X->b_size) == Y->b_data)
 363 
 364 
 365 /*
 366  * These are the return codes for the abort and reset functions.  The mid-level
 367  * code uses these to decide what to do next.  Each of the low level abort
 368  * and reset functions must correctly indicate what it has done.
 369  */
 370 
 371 /* We did not do anything.  
 372  * Wait some more for this command to complete, and if this does not work, 
 373  * try something more serious. */ 
 374 #define SCSI_ABORT_SNOOZE 0
 375 
 376 /* This means that we were able to abort the command.  We have already
 377  * called the mid-level done function, and do not expect an interrupt that 
 378  * will lead to another call to the mid-level done function for this command */
 379 #define SCSI_ABORT_SUCCESS 1
 380 
 381 /* We called for an abort of this command, and we should get an interrupt 
 382  * when this succeeds.  Thus we should not restore the timer for this
 383  * command in the mid-level abort function. */
 384 #define SCSI_ABORT_PENDING 2
 385 
 386 /* Unable to abort - command is currently on the bus.  Grin and bear it. */
 387 #define SCSI_ABORT_BUSY 3
 388 
 389 /* The command is not active in the low level code. Command probably
 390  * finished. */
 391 #define SCSI_ABORT_NOT_RUNNING 4
 392 
 393 /* Something went wrong.  The low level driver will indicate the correct
 394  * error condition when it calls scsi_done, so the mid-level abort function
 395  * can simply wait until this comes through */
 396 #define SCSI_ABORT_ERROR 5
 397 
 398 /* We do not know how to reset the bus, or we do not want to.  Bummer.
 399  * Anyway, just wait a little more for the command in question, and hope that
 400  * it eventually finishes.  If it never finishes, the SCSI device could
 401  * hang, so use this with caution. */
 402 #define SCSI_RESET_SNOOZE 0
 403 
 404 /* We do not know how to reset the bus, or we do not want to.  Bummer.
 405  * We have given up on this ever completing.  The mid-level code will
 406  * request sense information to decide how to proceed from here. */
 407 #define SCSI_RESET_PUNT 1
 408 
 409 /* This means that we were able to reset the bus.  We have restarted all of
 410  * the commands that should be restarted, and we should be able to continue
 411  * on normally from here.  We do not expect any interrupts that will return
 412  * DID_RESET to any of the other commands in the host_queue, and the mid-level
 413  * code does not need to do anything special to keep the commands alive. */
 414 #define SCSI_RESET_SUCCESS 2
 415 
 416 /* We called for a reset of this bus, and we should get an interrupt 
 417  * when this succeeds.  Each command should get its own status
 418  * passed up to scsi_done, but this has not happened yet. */
 419 #define SCSI_RESET_PENDING 3
 420 
 421 /* We did a reset, but do not expect an interrupt to signal DID_RESET.
 422  * This tells the upper level code to request the sense info, and this
 423  * should keep the command alive. */
 424 #define SCSI_RESET_WAKEUP 4
 425 
 426 /* Something went wrong, and we do not know how to fix it. */
 427 #define SCSI_RESET_ERROR 5
 428 
 429 void *   scsi_malloc(unsigned int);
 430 int      scsi_free(void *, unsigned int);
 431 extern unsigned int dma_free_sectors;  /* How much room do we have left */
 432 extern unsigned int need_isa_buffer;   /* True if some devices need indirection
 433                                         * buffers */
 434 
 435 /*
 436  * The Scsi_Cmnd structure is used by scsi.c internally, and for communication
 437  * with low level drivers that support multiple outstanding commands.
 438  */
 439 typedef struct scsi_pointer {
 440     char * ptr;                     /* data pointer */
 441     int this_residual;              /* left in this buffer */
 442     struct scatterlist *buffer;     /* which buffer */
 443     int buffers_residual;           /* how many buffers left */
 444     
 445     volatile int Status;
 446     volatile int Message;
 447     volatile int have_data_in;
 448     volatile int sent_command;
 449     volatile int phase;
 450 } Scsi_Pointer;
 451 
 452 typedef struct scsi_cmnd {
 453     struct Scsi_Host * host;
 454     Scsi_Device * device;
 455     unsigned char target, lun, channel;
 456     unsigned char cmd_len;
 457     unsigned char old_cmd_len;
 458     struct scsi_cmnd *next, *prev;  
 459     
 460     /* These elements define the operation we are about to perform */
 461     unsigned char cmnd[12];
 462     unsigned request_bufflen;   /* Actual request size */
 463     
 464     void * request_buffer;      /* Actual requested buffer */
 465     
 466     /* These elements define the operation we ultimately want to perform */
 467     unsigned char data_cmnd[12];
 468     unsigned short old_use_sg;  /* We save  use_sg here when requesting
 469                                  * sense info */
 470     unsigned short use_sg;      /* Number of pieces of scatter-gather */
 471     unsigned short sglist_len;  /* size of malloc'd scatter-gather list */
 472     unsigned short abort_reason;/* If the mid-level code requests an
 473                                  * abort, this is the reason. */
 474     unsigned bufflen;           /* Size of data buffer */
 475     void *buffer;               /* Data buffer */
 476     
 477     unsigned underflow;         /* Return error if less than this amount is 
 478                                  * transfered */
 479     
 480     unsigned transfersize;      /* How much we are guaranteed to transfer with
 481                                  * each SCSI transfer (ie, between disconnect /
 482                                  * reconnects.   Probably == sector size */
 483     
 484     
 485     struct request request;     /* A copy of the command we are working on */
 486 
 487     unsigned char sense_buffer[16];  /* Sense for this command, if needed */
 488 
 489 
 490     int retries;
 491     int allowed;
 492     int timeout_per_command, timeout_total, timeout;
 493 
 494     /*
 495      *  We handle the timeout differently if it happens when a reset, 
 496      *  abort, etc are in process. 
 497      */
 498     unsigned volatile char internal_timeout;
 499     
 500     unsigned flags;
 501     
 502     /* These variables are for the cdrom only. Once we have variable size 
 503      * buffers in the buffer cache, they will go away. */
 504     int this_count; 
 505     /* End of special cdrom variables */
 506     
 507     /* Low-level done function - can be used by low-level driver to point
 508      *  to completion function.  Not used by mid/upper level code. */
 509     void (*scsi_done)(struct scsi_cmnd *);  
 510     void (*done)(struct scsi_cmnd *);  /* Mid-level done function */
 511     
 512     /*
 513      * The following fields can be written to by the host specific code. 
 514      * Everything else should be left alone. 
 515      */
 516     
 517     Scsi_Pointer SCp;   /* Scratchpad used by some host adapters */
 518     
 519     unsigned char * host_scribble; /* The host adapter is allowed to
 520                                     * call scsi_malloc and get some memory
 521                                     * and hang it here.  The host adapter
 522                                     * is also expected to call scsi_free
 523                                     * to release this memory.  (The memory
 524                                     * obtained by scsi_malloc is guaranteed
 525                                     * to be at an address < 16Mb). */
 526     
 527     int result;                    /* Status code from lower level driver */
 528     
 529     unsigned char tag;             /* SCSI-II queued command tag */
 530     unsigned long pid;             /* Process ID, starts at 0 */
 531 } Scsi_Cmnd;         
 532 
 533 /*
 534  *  scsi_abort aborts the current command that is executing on host host.
 535  *  The error code, if non zero is returned in the host byte, otherwise 
 536  *  DID_ABORT is returned in the hostbyte.
 537  */
 538 
 539 extern int scsi_abort (Scsi_Cmnd *, int code, int pid);
 540 
 541 extern void scsi_do_cmd (Scsi_Cmnd *, const void *cmnd ,
 542                          void *buffer, unsigned bufflen, 
 543                          void (*done)(struct scsi_cmnd *),
 544                          int timeout, int retries);
 545 
 546 
 547 extern Scsi_Cmnd * allocate_device(struct request **, Scsi_Device *, int);
 548 
 549 extern Scsi_Cmnd * request_queueable(struct request *, Scsi_Device *);
 550 extern int scsi_reset (Scsi_Cmnd *);
 551 
 552 extern int max_scsi_hosts;
 553 
 554 extern void build_proc_dir_entries(void);
 555 extern void proc_print_scsidevice(Scsi_Device *, char *, int *, int);
 556 
 557 
 558 extern void print_command(unsigned char *);
 559 extern void print_sense(const char *,    Scsi_Cmnd *);
 560 
 561 
 562 #if defined(MAJOR_NR) && (MAJOR_NR != SCSI_TAPE_MAJOR)
 563 #include "hosts.h"
 564 
 565 static Scsi_Cmnd * end_scsi_request(Scsi_Cmnd * SCpnt, int uptodate, int sectors)
     /* [previous][next][first][last][top][bottom][index][help] */
 566 {
 567     struct request * req;
 568     struct buffer_head * bh;
 569     
 570     req = &SCpnt->request;
 571     req->errors = 0;
 572     if (!uptodate) {
 573         printk(DEVICE_NAME " I/O error: dev %04x, sector %lu\n",
 574                req->dev,req->sector);
 575     }
 576     
 577     do {
 578         if ((bh = req->bh) != NULL) {
 579             req->bh = bh->b_reqnext;
 580             req->nr_sectors -= bh->b_size >> 9;
 581             req->sector += bh->b_size >> 9;
 582             bh->b_reqnext = NULL;
 583             bh->b_uptodate = uptodate;
 584             unlock_buffer(bh);
 585             sectors -= bh->b_size >> 9;
 586             if ((bh = req->bh) != NULL) {
 587                 req->current_nr_sectors = bh->b_size >> 9;
 588                 if (req->nr_sectors < req->current_nr_sectors) {
 589                     req->nr_sectors = req->current_nr_sectors;
 590                     printk("end_scsi_request: buffer-list destroyed\n");
 591                 }
 592             }
 593         }
 594     } while(sectors && bh);
 595     if (req->bh){
 596         req->buffer = bh->b_data;
 597         return SCpnt;
 598     };
 599     DEVICE_OFF(req->dev);
 600     if (req->sem != NULL) {
 601         up(req->sem);
 602     }
 603     
 604     if (SCpnt->host->block) {
 605         struct Scsi_Host * next;
 606         
 607         for (next = SCpnt->host->block; next != SCpnt->host;
 608              next = next->block)
 609             wake_up(&next->host_wait);
 610     }
 611     
 612     req->dev = -1;
 613     wake_up(&wait_for_request);
 614     wake_up(&SCpnt->device->device_wait);
 615     return NULL;
 616 }
 617 
 618 
 619 /* This is just like INIT_REQUEST, but we need to be aware of the fact
 620  * that an interrupt may start another request, so we run this with interrupts
 621  * turned off 
 622  */
 623 #define INIT_SCSI_REQUEST \
 624     if (!CURRENT) {\
 625         CLEAR_INTR; \
 626         restore_flags(flags);   \
 627         return; \
 628     } \
 629     if (MAJOR(CURRENT->dev) != MAJOR_NR) \
 630         panic(DEVICE_NAME ": request list destroyed"); \
 631     if (CURRENT->bh) { \
 632         if (!CURRENT->bh->b_lock) \
 633             panic(DEVICE_NAME ": block not locked"); \
 634     }
 635 #endif
 636 
 637 #define SCSI_SLEEP(QUEUE, CONDITION) {              \
 638     if (CONDITION) {                    \
 639         struct wait_queue wait = { current, NULL};  \
 640         add_wait_queue(QUEUE, &wait);           \
 641         for(;;) {                           \
 642         current->state = TASK_UNINTERRUPTIBLE;      \
 643         if (CONDITION) {                \
 644                    if (intr_count)                              \
 645                       panic("scsi: trying to call schedule() in interrupt" \
 646                             ", file %s, line %d.\n", __FILE__, __LINE__);  \
 647            schedule();                  \
 648            }                            \
 649             else                        \
 650                    break;                                       \
 651         }                       \
 652         remove_wait_queue(QUEUE, &wait);        \
 653         current->state = TASK_RUNNING;          \
 654     }; }
 655 
 656 #endif
 657 
 658 /*
 659  * Overrides for Emacs so that we follow Linus's tabbing style.
 660  * Emacs will notice this stuff at the end of the file and automatically
 661  * adjust the settings for this buffer only.  This must remain at the end
 662  * of the file.
 663  * ---------------------------------------------------------------------------
 664  * Local variables:
 665  * c-indent-level: 4 
 666  * c-brace-imaginary-offset: 0
 667  * c-brace-offset: -4
 668  * c-argdecl-indent: 4
 669  * c-label-offset: -4
 670  * c-continued-statement-offset: 4
 671  * c-continued-brace-offset: 0
 672  * indent-tabs-mode: nil
 673  * tab-width: 8
 674  * End:
 675  */

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