include/linux/blk.h

   1 #ifndef _BLK_H
   2 #define _BLK_H
   3
   4 #include <linux/blkdev.h>
   5 #include <linux/locks.h>
   6 #include <linux/config.h>
   7
   8 /*
   9  * NR_REQUEST is the number of entries in the request-queue.
  10  * NOTE that writes may use only the low 2/3 of these: reads
  11  * take precedence.
  12  */
  13 #define NR_REQUEST      64
  14
  15 /*
  16  * This is used in the elevator algorithm.  We don't prioritise reads
  17  * over writes any more --- although reads are more time-critical than
  18  * writes, by treating them equally we increase filesystem throughput.
  19  * This turns out to give better overall performance.  -- sct
  20  */
  21 #define IN_ORDER(s1,s2) \
  22 ((s1)->rq_dev < (s2)->rq_dev || (((s1)->rq_dev == (s2)->rq_dev && \
  23 (s1)->sector < (s2)->sector)))
  24
  25 /*
  26  * These will have to be changed to be aware of different buffer
  27  * sizes etc.. It actually needs a major cleanup.
  28  */
  29 #if defined(IDE_DRIVER) || defined(MD_DRIVER)
  30 #define SECTOR_MASK ((BLOCK_SIZE >> 9) - 1)
  31 #else
  32 #define SECTOR_MASK (blksize_size[MAJOR_NR] &&     \
  33         blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] ? \
  34         ((blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] >> 9) - 1) :  \
  35         ((BLOCK_SIZE >> 9)  -  1))
  36 #endif /* IDE_DRIVER */
  37
  38 #define SUBSECTOR(block) (CURRENT->current_nr_sectors > 0)
  39
  40 #ifdef CONFIG_CDU31A
  41 extern int cdu31a_init(void);
  42 #endif CONFIG_CDU31A
  43 #ifdef CONFIG_ATARI_ACSI
  44 extern int acsi_init(void);
  45 #endif CONFIG_ATARI_ACSI
  46 #ifdef CONFIG_MCD
  47 extern int mcd_init(void);
  48 #endif CONFIG_MCD
  49 #ifdef CONFIG_MCDX
  50 extern int mcdx_init(void);
  51 #endif CONFIG_MCDX
  52 #ifdef CONFIG_SBPCD
  53 extern int sbpcd_init(void);
  54 #endif CONFIG_SBPCD
  55 #ifdef CONFIG_AZTCD
  56 extern int aztcd_init(void);
  57 #endif CONFIG_AZTCD
  58 #ifdef CONFIG_CDU535
  59 extern int sony535_init(void);
  60 #endif CONFIG_CDU535
  61 #ifdef CONFIG_GSCD
  62 extern int gscd_init(void);
  63 #endif CONFIG_GSCD
  64 #ifdef CONFIG_CM206
  65 extern int cm206_init(void);
  66 #endif CONFIG_CM206
  67 #ifdef CONFIG_OPTCD
  68 extern int optcd_init(void);
  69 #endif CONFIG_OPTCD
  70 #ifdef CONFIG_SJCD
  71 extern int sjcd_init(void);
  72 #endif CONFIG_SJCD
  73 #ifdef CONFIG_CDI_INIT
  74 extern int cdi_init(void);
  75 #endif CONFIG_CDI_INIT
  76 #ifdef CONFIG_BLK_DEV_HD
  77 extern int hd_init(void);
  78 #endif
  79 #ifdef CONFIG_BLK_DEV_IDE
  80 extern int ide_init(void);
  81 #endif
  82 #ifdef CONFIG_BLK_DEV_XD
  83 extern int xd_init(void);
  84 #endif
  85 #ifdef CONFIG_BLK_DEV_LOOP
  86 extern int loop_init(void);
  87 #endif
  88 #ifdef CONFIG_BLK_DEV_MD
  89 extern int md_init(void);
  90 #endif CONFIG_BLK_DEV_MD
  91 #ifdef CONFIG_APBLOCK
  92 extern int ap_init(void);
  93 #endif
  94 #ifdef CONFIG_DDV
  95 extern int ddv_init(void);
  96 #endif
  97 #ifdef CONFIG_AMIGA_Z2RAM
  98 extern int z2_init(void);
  99 #endif
 100
 101 extern void set_device_ro(kdev_t dev,int flag);
 102 void add_blkdev_randomness(int major);
 103
 104 extern int floppy_init(void);
 105 extern void rd_load(void);
 106 extern int rd_init(void);
 107 extern int rd_doload;           /* 1 = load ramdisk, 0 = don't load */
 108 extern int rd_prompt;           /* 1 = prompt for ramdisk, 0 = don't prompt */
 109 extern int rd_image_start;      /* starting block # of image */
 110
 111 #ifdef CONFIG_BLK_DEV_INITRD
 112
 113 #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
 114
 115 extern unsigned long initrd_start,initrd_end;
 116 extern int mount_initrd; /* zero if initrd should not be mounted */
 117 extern int initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
 118 void initrd_init(void);
 119
 120 #endif
 121 #ifdef CONFIG_BLK_DEV_PS2
 122 extern int ps2esdi_init(void);
 123 #endif
 124
 125 #define RO_IOCTLS(dev,where) \
 126   case BLKROSET: { int __val;  if (!suser()) return -EACCES; \
 127                    if (get_user(__val, (int *)(where))) return -EFAULT; \
 128                    set_device_ro((dev),__val); return 0; } \
 129   case BLKROGET: { int __val = (is_read_only(dev) != 0) ; \
 130                     return put_user(__val,(int *) (where)); }
 131
 132 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
 133
 134 /*
 135  * Add entries as needed.
 136  */
 137
 138 #ifdef IDE_DRIVER
 139
 140 #define DEVICE_NR(device)       (MINOR(device) >> PARTN_BITS)
 141 #define DEVICE_ON(device)       /* nothing */
 142 #define DEVICE_OFF(device)      /* nothing */
 143
 144 #elif (MAJOR_NR == RAMDISK_MAJOR)
 145
 146 /* ram disk */
 147 #define DEVICE_NAME "ramdisk"
 148 #define DEVICE_REQUEST rd_request
 149 #define DEVICE_NR(device) (MINOR(device))
 150 #define DEVICE_ON(device)
 151 #define DEVICE_OFF(device)
 152 #define DEVICE_NO_RANDOM
 153
 154 #elif (MAJOR_NR == Z2RAM_MAJOR)
 155
 156 /* Zorro II Ram */
 157 #define DEVICE_NAME "Z2RAM"
 158 #define DEVICE_REQUEST do_z2_request
 159 #define DEVICE_NR(device) (MINOR(device))
 160 #define DEVICE_ON(device)
 161 #define DEVICE_OFF(device)
 162
 163 #elif (MAJOR_NR == FLOPPY_MAJOR)
 164
 165 static void floppy_off(unsigned int nr);
 166
 167 #define DEVICE_NAME "floppy"
 168 #define DEVICE_INTR do_floppy
 169 #define DEVICE_REQUEST do_fd_request
 170 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
 171 #define DEVICE_ON(device)
 172 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 173
 174 #elif (MAJOR_NR == HD_MAJOR)
 175
 176 /* harddisk: timeout is 6 seconds.. */
 177 #define DEVICE_NAME "harddisk"
 178 #define DEVICE_INTR do_hd
 179 #define DEVICE_TIMEOUT HD_TIMER
 180 #define TIMEOUT_VALUE (6*HZ)
 181 #define DEVICE_REQUEST do_hd_request
 182 #define DEVICE_NR(device) (MINOR(device)>>6)
 183 #define DEVICE_ON(device)
 184 #define DEVICE_OFF(device)
 185
 186 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 187
 188 #define DEVICE_NAME "scsidisk"
 189 #define DEVICE_INTR do_sd
 190 #define TIMEOUT_VALUE (2*HZ)
 191 #define DEVICE_REQUEST do_sd_request
 192 #define DEVICE_NR(device) (MINOR(device) >> 4)
 193 #define DEVICE_ON(device)
 194 #define DEVICE_OFF(device)
 195
 196 /* Kludge to use the same number for both char and block major numbers */
 197 #elif  (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
 198
 199 #define DEVICE_NAME "Multiple devices driver"
 200 #define DEVICE_REQUEST do_md_request
 201 #define DEVICE_NR(device) (MINOR(device))
 202 #define DEVICE_ON(device)
 203 #define DEVICE_OFF(device)
 204
 205 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 206
 207 #define DEVICE_NAME "scsitape"
 208 #define DEVICE_INTR do_st
 209 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 210 #define DEVICE_ON(device)
 211 #define DEVICE_OFF(device)
 212
 213 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 214
 215 #define DEVICE_NAME "CD-ROM"
 216 #define DEVICE_INTR do_sr
 217 #define DEVICE_REQUEST do_sr_request
 218 #define DEVICE_NR(device) (MINOR(device))
 219 #define DEVICE_ON(device)
 220 #define DEVICE_OFF(device)
 221
 222 #elif (MAJOR_NR == XT_DISK_MAJOR)
 223
 224 #define DEVICE_NAME "xt disk"
 225 #define DEVICE_REQUEST do_xd_request
 226 #define DEVICE_NR(device) (MINOR(device) >> 6)
 227 #define DEVICE_ON(device)
 228 #define DEVICE_OFF(device)
 229
 230 #elif (MAJOR_NR == PS2ESDI_MAJOR)
 231
 232 #define DEVICE_NAME "PS/2 ESDI"
 233 #define DEVICE_REQUEST do_ps2esdi_request
 234 #define DEVICE_NR(device) (MINOR(device) >> 6)
 235 #define DEVICE_ON(device)
 236 #define DEVICE_OFF(device)
 237
 238 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 239
 240 #define DEVICE_NAME "CDU31A"
 241 #define DEVICE_REQUEST do_cdu31a_request
 242 #define DEVICE_NR(device) (MINOR(device))
 243 #define DEVICE_ON(device)
 244 #define DEVICE_OFF(device)
 245
 246 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
 247
 248 #define DEVICE_NAME "ACSI"
 249 #define DEVICE_INTR do_acsi
 250 #define DEVICE_REQUEST do_acsi_request
 251 #define DEVICE_NR(device) (MINOR(device) >> 4)
 252 #define DEVICE_ON(device)
 253 #define DEVICE_OFF(device)
 254
 255 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 256
 257 #define DEVICE_NAME "Mitsumi CD-ROM"
 258 /* #define DEVICE_INTR do_mcd */
 259 #define DEVICE_REQUEST do_mcd_request
 260 #define DEVICE_NR(device) (MINOR(device))
 261 #define DEVICE_ON(device)
 262 #define DEVICE_OFF(device)
 263
 264 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
 265
 266 #define DEVICE_NAME "Mitsumi CD-ROM"
 267 /* #define DEVICE_INTR do_mcdx */
 268 #define DEVICE_REQUEST do_mcdx_request
 269 #define DEVICE_NR(device) (MINOR(device))
 270 #define DEVICE_ON(device)
 271 #define DEVICE_OFF(device)
 272
 273 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 274
 275 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
 276 #define DEVICE_REQUEST do_sbpcd_request
 277 #define DEVICE_NR(device) (MINOR(device))
 278 #define DEVICE_ON(device)
 279 #define DEVICE_OFF(device)
 280
 281 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 282
 283 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
 284 #define DEVICE_REQUEST do_sbpcd2_request
 285 #define DEVICE_NR(device) (MINOR(device))
 286 #define DEVICE_ON(device)
 287 #define DEVICE_OFF(device)
 288
 289 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 290
 291 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
 292 #define DEVICE_REQUEST do_sbpcd3_request
 293 #define DEVICE_NR(device) (MINOR(device))
 294 #define DEVICE_ON(device)
 295 #define DEVICE_OFF(device)
 296
 297 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 298
 299 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
 300 #define DEVICE_REQUEST do_sbpcd4_request
 301 #define DEVICE_NR(device) (MINOR(device))
 302 #define DEVICE_ON(device)
 303 #define DEVICE_OFF(device)
 304
 305 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 306
 307 #define DEVICE_NAME "Aztech CD-ROM"
 308 #define DEVICE_REQUEST do_aztcd_request
 309 #define DEVICE_NR(device) (MINOR(device))
 310 #define DEVICE_ON(device)
 311 #define DEVICE_OFF(device)
 312
 313 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 314
 315 #define DEVICE_NAME "SONY-CDU535"
 316 #define DEVICE_INTR do_cdu535
 317 #define DEVICE_REQUEST do_cdu535_request
 318 #define DEVICE_NR(device) (MINOR(device))
 319 #define DEVICE_ON(device)
 320 #define DEVICE_OFF(device)
 321
 322 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
 323
 324 #define DEVICE_NAME "Goldstar R420"
 325 #define DEVICE_REQUEST do_gscd_request
 326 #define DEVICE_NR(device) (MINOR(device))
 327 #define DEVICE_ON(device)
 328 #define DEVICE_OFF(device)
 329
 330 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
 331 #define DEVICE_NAME "Philips/LMS cd-rom cm206"
 332 #define DEVICE_REQUEST do_cm206_request
 333 #define DEVICE_NR(device) (MINOR(device))
 334 #define DEVICE_ON(device)
 335 #define DEVICE_OFF(device)
 336
 337 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
 338
 339 #define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
 340 #define DEVICE_REQUEST do_optcd_request
 341 #define DEVICE_NR(device) (MINOR(device))
 342 #define DEVICE_ON(device)
 343 #define DEVICE_OFF(device)
 344
 345 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
 346
 347 #define DEVICE_NAME "Sanyo H94A CD-ROM"
 348 #define DEVICE_REQUEST do_sjcd_request
 349 #define DEVICE_NR(device) (MINOR(device))
 350 #define DEVICE_ON(device)
 351 #define DEVICE_OFF(device)
 352
 353 #elif (MAJOR_NR == APBLOCK_MAJOR)
 354
 355 #define DEVICE_NAME "apblock"
 356 #define DEVICE_REQUEST ap_request
 357 #define DEVICE_NR(device) (MINOR(device))
 358 #define DEVICE_ON(device)
 359 #define DEVICE_OFF(device)
 360
 361 #elif (MAJOR_NR == DDV_MAJOR)
 362
 363 #define DEVICE_NAME "ddv"
 364 #define DEVICE_REQUEST ddv_request
 365 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
 366 #define DEVICE_ON(device)
 367 #define DEVICE_OFF(device)
 368
 369 #endif /* MAJOR_NR == whatever */
 370
 371 #if (MAJOR_NR != SCSI_TAPE_MAJOR)
 372 #if !defined(IDE_DRIVER)
 373
 374 #ifndef CURRENT
 375 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 376 #endif
 377
 378 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
 379
 380 #ifdef DEVICE_INTR
 381 static void (*DEVICE_INTR)(void) = NULL;
 382 #endif
 383 #ifdef DEVICE_TIMEOUT
 384
 385 #define SET_TIMER \
 386 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 387 (timer_active |= 1<<DEVICE_TIMEOUT))
 388
 389 #define CLEAR_TIMER \
 390 timer_active &= ~(1<<DEVICE_TIMEOUT)
 391
 392 #define SET_INTR(x) \
 393 if ((DEVICE_INTR = (x)) != NULL) \
 394         SET_TIMER; \
 395 else \
 396         CLEAR_TIMER;
 397
 398 #else
 399
 400 #define SET_INTR(x) (DEVICE_INTR = (x))
 401
 402 #endif /* DEVICE_TIMEOUT */
 403
 404 static void (DEVICE_REQUEST)(void);
 405
 406 #ifdef DEVICE_INTR
 407 #define CLEAR_INTR SET_INTR(NULL)
 408 #else
 409 #define CLEAR_INTR
 410 #endif
 411
 412 #define INIT_REQUEST \
 413         if (!CURRENT) {\
 414                 CLEAR_INTR; \
 415                 return; \
 416         } \
 417         if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
 418                 panic(DEVICE_NAME ": request list destroyed"); \
 419         if (CURRENT->bh) { \
 420                 if (!buffer_locked(CURRENT->bh)) \
 421                         panic(DEVICE_NAME ": block not locked"); \
 422         }
 423
 424 #endif /* !defined(IDE_DRIVER) */
 425
 426 /* end_request() - SCSI devices have their own version */
 427 /*               - IDE drivers have their own copy too */
 428
 429 #if ! SCSI_BLK_MAJOR(MAJOR_NR)
 430
 431 #if defined(IDE_DRIVER) && !defined(_IDE_C) /* shared copy for IDE modules */
 432 void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);
 433 #else
 434
 435 #ifdef IDE_DRIVER
 436 void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {
 437         struct request *req = hwgroup->rq;
 438 #else
 439 static void end_request(int uptodate) {
 440         struct request *req = CURRENT;
 441 #endif /* IDE_DRIVER */
 442         struct buffer_head * bh;
 443         int nsect;
 444
 445         req->errors = 0;
 446         if (!uptodate) {
 447                 printk("end_request: I/O error, dev %s, sector %lu\n",
 448                         kdevname(req->rq_dev), req->sector);
 449                 if ((bh = req->bh) != NULL) {
 450                         nsect = bh->b_size >> 9;
 451                         req->nr_sectors--;
 452                         req->nr_sectors &= ~(nsect - 1);
 453                         req->sector += nsect;
 454                         req->sector &= ~(nsect - 1);
 455                 }
 456         }
 457
 458         if ((bh = req->bh) != NULL) {
 459                 req->bh = bh->b_reqnext;
 460                 bh->b_reqnext = NULL;
 461                 mark_buffer_uptodate(bh, uptodate);
 462                 unlock_buffer(bh);
 463                 if ((bh = req->bh) != NULL) {
 464                         req->current_nr_sectors = bh->b_size >> 9;
 465                         if (req->nr_sectors < req->current_nr_sectors) {
 466                                 req->nr_sectors = req->current_nr_sectors;
 467                                 printk("end_request: buffer-list destroyed\n");
 468                         }
 469                         req->buffer = bh->b_data;
 470                         return;
 471                 }
 472         }
 473 #ifndef DEVICE_NO_RANDOM
 474         add_blkdev_randomness(MAJOR(req->rq_dev));
 475 #endif
 476 #ifdef IDE_DRIVER
 477         hwgroup->drive->queue = req->next;
 478         blk_dev[MAJOR(req->rq_dev)].current_request = NULL;
 479         hwgroup->rq = NULL;
 480 #else
 481         DEVICE_OFF(req->rq_dev);
 482         CURRENT = req->next;
 483 #endif /* IDE_DRIVER */
 484         if (req->sem != NULL)
 485                 up(req->sem);
 486         req->rq_status = RQ_INACTIVE;
 487         wake_up(&wait_for_request);
 488 }
 489 #endif /* defined(IDE_DRIVER) && !defined(_IDE_C) */
 490 #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
 491 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
 492
 493 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 494
 495 #endif /* _BLK_H */