include/linux/blk.h

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 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 externintcdu31a_init(void);
 42 #endif CONFIG_CDU31A
 43 #ifdef CONFIG_ATARI_ACSI
 44 externintacsi_init(void);
 45 #endif CONFIG_ATARI_ACSI
 46 #ifdef CONFIG_MCD
 47 externintmcd_init(void);
 48 #endif CONFIG_MCD
 49 #ifdef CONFIG_MCDX
 50 externintmcdx_init(void);
 51 #endif CONFIG_MCDX
 52 #ifdef CONFIG_SBPCD
 53 externintsbpcd_init(void);
 54 #endif CONFIG_SBPCD
 55 #ifdef CONFIG_AZTCD
 56 externintaztcd_init(void);
 57 #endif CONFIG_AZTCD
 58 #ifdef CONFIG_CDU535
 59 externintsony535_init(void);
 60 #endif CONFIG_CDU535
 61 #ifdef CONFIG_GSCD
 62 externintgscd_init(void);
 63 #endif CONFIG_GSCD
 64 #ifdef CONFIG_CM206
 65 externintcm206_init(void);
 66 #endif CONFIG_CM206
 67 #ifdef CONFIG_OPTCD
 68 externintoptcd_init(void);
 69 #endif CONFIG_OPTCD
 70 #ifdef CONFIG_SJCD
 71 externintsjcd_init(void);
 72 #endif CONFIG_SJCD
 73 #ifdef CONFIG_CDI_INIT
 74 externintcdi_init(void);
 75 #endif CONFIG_CDI_INIT
 76 #ifdef CONFIG_BLK_DEV_HD
 77 externinthd_init(void);
 78 #endif
 79 #ifdef CONFIG_BLK_DEV_IDE
 80 externintide_init(void);
 81 #endif
 82 #ifdef CONFIG_BLK_DEV_XD
 83 externintxd_init(void);
 84 #endif
 85 #ifdef CONFIG_BLK_DEV_LOOP
 86 externintloop_init(void);
 87 #endif
 88 #ifdef CONFIG_BLK_DEV_MD
 89 externintmd_init(void);
 90 #endif CONFIG_BLK_DEV_MD
 91 #ifdef CONFIG_APBLOCK
 92 externintap_init(void);
 93 #endif
 94 #ifdef CONFIG_DDV
 95 externintddv_init(void);
 96 #endif
 97 #ifdef CONFIG_AMIGA_Z2RAM
 98 externintz2_init(void);
 99 #endif
 100 #ifdef CONFIG_MAC_FLOPPY
 101 externintswim3_init(void);
 102 #endif
 103
 104 externvoidset_device_ro(kdev_t dev,int flag);
 105 voidadd_blkdev_randomness(int major);
 106
 107 externintfloppy_init(void);
 108 externvoidrd_load(void);
 109 externintrd_init(void);
 110 externint rd_doload;/* 1 = load ramdisk, 0 = don't load */
 111 externint rd_prompt;/* 1 = prompt for ramdisk, 0 = don't prompt */
 112 externint rd_image_start;/* starting block # of image */
 113
 114 #ifdef CONFIG_BLK_DEV_INITRD
 115
 116 #define INITRD_MINOR 250/* shouldn't collide with /dev/ram* too soon ... */
 117
 118 externunsigned long initrd_start,initrd_end;
 119 externint mount_initrd;/* zero if initrd should not be mounted */
 120 externint initrd_below_start_ok;/* 1 if it is not an error if initrd_start < memory_start */
 121 voidinitrd_init(void);
 122
 123 #endif
 124 #ifdef CONFIG_BLK_DEV_PS2
 125 externintps2esdi_init(void);
 126 #endif
 127
 128 #define RO_IOCTLS(dev,where) \
 129  case BLKROSET: { int __val; if (!suser()) return -EACCES; \
 130  if (get_user(__val, (int *)(where))) return -EFAULT; \
 131  set_device_ro((dev),__val); return 0; } \
 132  case BLKROGET: { int __val = (is_read_only(dev) != 0) ; \
 133  return put_user(__val,(int *) (where)); }
 134
 135 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
 136
 137 /*
 138  * Add entries as needed.
 139  */
 140
 141 #ifdef IDE_DRIVER
 142
 143 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
 144 #define DEVICE_ON(device)/* nothing */
 145 #define DEVICE_OFF(device)/* nothing */
 146
 147 #elif (MAJOR_NR == RAMDISK_MAJOR)
 148
 149 /* ram disk */
 150 #define DEVICE_NAME"ramdisk"
 151 #define DEVICE_REQUEST rd_request
 152 #define DEVICE_NR(device) (MINOR(device))
 153 #define DEVICE_ON(device)
 154 #define DEVICE_OFF(device)
 155 #define DEVICE_NO_RANDOM
 156
 157 #elif (MAJOR_NR == Z2RAM_MAJOR)
 158
 159 /* Zorro II Ram */
 160 #define DEVICE_NAME"Z2RAM"
 161 #define DEVICE_REQUEST do_z2_request
 162 #define DEVICE_NR(device) (MINOR(device))
 163 #define DEVICE_ON(device)
 164 #define DEVICE_OFF(device)
 165
 166 #elif (MAJOR_NR == FLOPPY_MAJOR)
 167
 168 static voidfloppy_off(unsigned int nr);
 169
 170 #define DEVICE_NAME"floppy"
 171 #define DEVICE_INTR do_floppy
 172 #define DEVICE_REQUEST do_fd_request
 173 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
 174 #define DEVICE_ON(device)
 175 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 176
 177 #elif (MAJOR_NR == HD_MAJOR)
 178
 179 /* harddisk: timeout is 6 seconds.. */
 180 #define DEVICE_NAME"harddisk"
 181 #define DEVICE_INTR do_hd
 182 #define DEVICE_TIMEOUT HD_TIMER
 183 #define TIMEOUT_VALUE (6*HZ)
 184 #define DEVICE_REQUEST do_hd_request
 185 #define DEVICE_NR(device) (MINOR(device)>>6)
 186 #define DEVICE_ON(device)
 187 #define DEVICE_OFF(device)
 188
 189 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 190
 191 #define DEVICE_NAME"scsidisk"
 192 #define DEVICE_INTR do_sd
 193 #define TIMEOUT_VALUE (2*HZ)
 194 #define DEVICE_REQUEST do_sd_request
 195 #define DEVICE_NR(device) (MINOR(device) >> 4)
 196 #define DEVICE_ON(device)
 197 #define DEVICE_OFF(device)
 198
 199 /* Kludge to use the same number for both char and block major numbers */
 200 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
 201
 202 #define DEVICE_NAME"Multiple devices driver"
 203 #define DEVICE_REQUEST do_md_request
 204 #define DEVICE_NR(device) (MINOR(device))
 205 #define DEVICE_ON(device)
 206 #define DEVICE_OFF(device)
 207
 208 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 209
 210 #define DEVICE_NAME"scsitape"
 211 #define DEVICE_INTR do_st
 212 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 213 #define DEVICE_ON(device)
 214 #define DEVICE_OFF(device)
 215
 216 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 217
 218 #define DEVICE_NAME"CD-ROM"
 219 #define DEVICE_INTR do_sr
 220 #define DEVICE_REQUEST do_sr_request
 221 #define DEVICE_NR(device) (MINOR(device))
 222 #define DEVICE_ON(device)
 223 #define DEVICE_OFF(device)
 224
 225 #elif (MAJOR_NR == XT_DISK_MAJOR)
 226
 227 #define DEVICE_NAME"xt disk"
 228 #define DEVICE_REQUEST do_xd_request
 229 #define DEVICE_NR(device) (MINOR(device) >> 6)
 230 #define DEVICE_ON(device)
 231 #define DEVICE_OFF(device)
 232
 233 #elif (MAJOR_NR == PS2ESDI_MAJOR)
 234
 235 #define DEVICE_NAME"PS/2 ESDI"
 236 #define DEVICE_REQUEST do_ps2esdi_request
 237 #define DEVICE_NR(device) (MINOR(device) >> 6)
 238 #define DEVICE_ON(device)
 239 #define DEVICE_OFF(device)
 240
 241 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 242
 243 #define DEVICE_NAME"CDU31A"
 244 #define DEVICE_REQUEST do_cdu31a_request
 245 #define DEVICE_NR(device) (MINOR(device))
 246 #define DEVICE_ON(device)
 247 #define DEVICE_OFF(device)
 248
 249 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
 250
 251 #define DEVICE_NAME"ACSI"
 252 #define DEVICE_INTR do_acsi
 253 #define DEVICE_REQUEST do_acsi_request
 254 #define DEVICE_NR(device) (MINOR(device) >> 4)
 255 #define DEVICE_ON(device)
 256 #define DEVICE_OFF(device)
 257
 258 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 259
 260 #define DEVICE_NAME"Mitsumi CD-ROM"
 261 /* #define DEVICE_INTR do_mcd */
 262 #define DEVICE_REQUEST do_mcd_request
 263 #define DEVICE_NR(device) (MINOR(device))
 264 #define DEVICE_ON(device)
 265 #define DEVICE_OFF(device)
 266
 267 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
 268
 269 #define DEVICE_NAME"Mitsumi CD-ROM"
 270 /* #define DEVICE_INTR do_mcdx */
 271 #define DEVICE_REQUEST do_mcdx_request
 272 #define DEVICE_NR(device) (MINOR(device))
 273 #define DEVICE_ON(device)
 274 #define DEVICE_OFF(device)
 275
 276 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 277
 278 #define DEVICE_NAME"Matsushita CD-ROM controller #1"
 279 #define DEVICE_REQUEST do_sbpcd_request
 280 #define DEVICE_NR(device) (MINOR(device))
 281 #define DEVICE_ON(device)
 282 #define DEVICE_OFF(device)
 283
 284 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 285
 286 #define DEVICE_NAME"Matsushita CD-ROM controller #2"
 287 #define DEVICE_REQUEST do_sbpcd2_request
 288 #define DEVICE_NR(device) (MINOR(device))
 289 #define DEVICE_ON(device)
 290 #define DEVICE_OFF(device)
 291
 292 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 293
 294 #define DEVICE_NAME"Matsushita CD-ROM controller #3"
 295 #define DEVICE_REQUEST do_sbpcd3_request
 296 #define DEVICE_NR(device) (MINOR(device))
 297 #define DEVICE_ON(device)
 298 #define DEVICE_OFF(device)
 299
 300 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 301
 302 #define DEVICE_NAME"Matsushita CD-ROM controller #4"
 303 #define DEVICE_REQUEST do_sbpcd4_request
 304 #define DEVICE_NR(device) (MINOR(device))
 305 #define DEVICE_ON(device)
 306 #define DEVICE_OFF(device)
 307
 308 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 309
 310 #define DEVICE_NAME"Aztech CD-ROM"
 311 #define DEVICE_REQUEST do_aztcd_request
 312 #define DEVICE_NR(device) (MINOR(device))
 313 #define DEVICE_ON(device)
 314 #define DEVICE_OFF(device)
 315
 316 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 317
 318 #define DEVICE_NAME"SONY-CDU535"
 319 #define DEVICE_INTR do_cdu535
 320 #define DEVICE_REQUEST do_cdu535_request
 321 #define DEVICE_NR(device) (MINOR(device))
 322 #define DEVICE_ON(device)
 323 #define DEVICE_OFF(device)
 324
 325 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
 326
 327 #define DEVICE_NAME"Goldstar R420"
 328 #define DEVICE_REQUEST do_gscd_request
 329 #define DEVICE_NR(device) (MINOR(device))
 330 #define DEVICE_ON(device)
 331 #define DEVICE_OFF(device)
 332
 333 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
 334 #define DEVICE_NAME"Philips/LMS cd-rom cm206"
 335 #define DEVICE_REQUEST do_cm206_request
 336 #define DEVICE_NR(device) (MINOR(device))
 337 #define DEVICE_ON(device)
 338 #define DEVICE_OFF(device)
 339
 340 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
 341
 342 #define DEVICE_NAME"DOLPHIN 8000AT CD-ROM"
 343 #define DEVICE_REQUEST do_optcd_request
 344 #define DEVICE_NR(device) (MINOR(device))
 345 #define DEVICE_ON(device)
 346 #define DEVICE_OFF(device)
 347
 348 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
 349
 350 #define DEVICE_NAME"Sanyo H94A CD-ROM"
 351 #define DEVICE_REQUEST do_sjcd_request
 352 #define DEVICE_NR(device) (MINOR(device))
 353 #define DEVICE_ON(device)
 354 #define DEVICE_OFF(device)
 355
 356 #elif (MAJOR_NR == APBLOCK_MAJOR)
 357
 358 #define DEVICE_NAME"apblock"
 359 #define DEVICE_REQUEST ap_request
 360 #define DEVICE_NR(device) (MINOR(device))
 361 #define DEVICE_ON(device)
 362 #define DEVICE_OFF(device)
 363
 364 #elif (MAJOR_NR == DDV_MAJOR)
 365
 366 #define DEVICE_NAME"ddv"
 367 #define DEVICE_REQUEST ddv_request
 368 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
 369 #define DEVICE_ON(device)
 370 #define DEVICE_OFF(device)
 371
 372 #endif/* MAJOR_NR == whatever */
 373
 374 #if (MAJOR_NR != SCSI_TAPE_MAJOR)
 375 #if !defined(IDE_DRIVER)
 376
 377 #ifndef CURRENT
 378 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 379 #endif
 380
 381 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
 382
 383 #ifdef DEVICE_INTR
 384 static void(*DEVICE_INTR)(void) = NULL;
 385 #endif
 386 #ifdef DEVICE_TIMEOUT
 387
 388 #define SET_TIMER \
 389 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 390 (timer_active |= 1<<DEVICE_TIMEOUT))
 391
 392 #define CLEAR_TIMER \
 393 timer_active &= ~(1<<DEVICE_TIMEOUT)
 394
 395 #define SET_INTR(x) \
 396 if ((DEVICE_INTR = (x)) != NULL) \
 397  SET_TIMER; \
 398 else \
 399  CLEAR_TIMER;
 400
 401 #else
 402
 403 #define SET_INTR(x) (DEVICE_INTR = (x))
 404
 405 #endif/* DEVICE_TIMEOUT */
 406
 407 static void(DEVICE_REQUEST)(void);
 408
 409 #ifdef DEVICE_INTR
 410 #define CLEAR_INTR SET_INTR(NULL)
 411 #else
 412 #define CLEAR_INTR
 413 #endif
 414
 415 #define INIT_REQUEST \
 416  if (!CURRENT) {\
 417  CLEAR_INTR; \
 418  return; \
 419  } \
 420  if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
 421  panic(DEVICE_NAME": request list destroyed"); \
 422  if (CURRENT->bh) { \
 423  if (!buffer_locked(CURRENT->bh)) \
 424  panic(DEVICE_NAME": block not locked"); \
 425  }
 426
 427 #endif/* !defined(IDE_DRIVER) */
 428
 429 /* end_request() - SCSI devices have their own version */
 430 /* - IDE drivers have their own copy too */
 431
 432 #if ! SCSI_BLK_MAJOR(MAJOR_NR)
 433
 434 #if defined(IDE_DRIVER) && !defined(_IDE_C)/* shared copy for IDE modules */
 435 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);
 436 #else
 437
 438 #ifdef IDE_DRIVER
 439 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {
 440 struct request *req = hwgroup->rq;
 441 #else
 442 static voidend_request(int uptodate) {
 443 struct request *req = CURRENT;
 444 #endif/* IDE_DRIVER */
 445 struct buffer_head * bh;
 446 int nsect;
 447
 448  req->errors =0;
 449 if(!uptodate) {
 450 printk("end_request: I/O error, dev %s, sector %lu\n",
 451 kdevname(req->rq_dev), req->sector);
 452 if((bh = req->bh) != NULL) {
 453  nsect = bh->b_size >>9;
 454  req->nr_sectors--;
 455  req->nr_sectors &= ~(nsect -1);
 456  req->sector += nsect;
 457  req->sector &= ~(nsect -1);
 458 }
 459 }
 460
 461 if((bh = req->bh) != NULL) {
 462  req->bh = bh->b_reqnext;
 463  bh->b_reqnext = NULL;
 464  bh->b_end_io(bh, uptodate);
 465 if((bh = req->bh) != NULL) {
 466  req->current_nr_sectors = bh->b_size >>9;
 467 if(req->nr_sectors < req->current_nr_sectors) {
 468  req->nr_sectors = req->current_nr_sectors;
 469 printk("end_request: buffer-list destroyed\n");
 470 }
 471  req->buffer = bh->b_data;
 472 return;
 473 }
 474 }
 475 #ifndef DEVICE_NO_RANDOM
 476 add_blkdev_randomness(MAJOR(req->rq_dev));
 477 #endif
 478 #ifdef IDE_DRIVER
 479  hwgroup->drive->queue = req->next;
 480  blk_dev[MAJOR(req->rq_dev)].current_request = NULL;
 481  hwgroup->rq = NULL;
 482 #else
 483 DEVICE_OFF(req->rq_dev);
 484  CURRENT = req->next;
 485 #endif/* IDE_DRIVER */
 486 if(req->sem != NULL)
 487 up(req->sem);
 488  req->rq_status = RQ_INACTIVE;
 489 wake_up(&wait_for_request);
 490 }
 491 #endif/* defined(IDE_DRIVER) && !defined(_IDE_C) */
 492 #endif/* ! SCSI_BLK_MAJOR(MAJOR_NR) */
 493 #endif/* (MAJOR_NR != SCSI_TAPE_MAJOR) */
 494
 495 #endif/* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 496
 497 #endif/* _BLK_H */