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_MCD
 44 externintmcd_init(void);
 45 #endif CONFIG_MCD
 46 #ifdef CONFIG_MCDX
 47 externintmcdx_init(void);
 48 #endif CONFIG_MCDX
 49 #ifdef CONFIG_SBPCD
 50 externintsbpcd_init(void);
 51 #endif CONFIG_SBPCD
 52 #ifdef CONFIG_AZTCD
 53 externintaztcd_init(void);
 54 #endif CONFIG_AZTCD
 55 #ifdef CONFIG_CDU535
 56 externintsony535_init(void);
 57 #endif CONFIG_CDU535
 58 #ifdef CONFIG_GSCD
 59 externintgscd_init(void);
 60 #endif CONFIG_GSCD
 61 #ifdef CONFIG_CM206
 62 externintcm206_init(void);
 63 #endif CONFIG_CM206
 64 #ifdef CONFIG_OPTCD
 65 externintoptcd_init(void);
 66 #endif CONFIG_OPTCD
 67 #ifdef CONFIG_SJCD
 68 externintsjcd_init(void);
 69 #endif CONFIG_SJCD
 70 #ifdef CONFIG_CDI_INIT
 71 externintcdi_init(void);
 72 #endif CONFIG_CDI_INIT
 73 #ifdef CONFIG_BLK_DEV_HD
 74 externinthd_init(void);
 75 #endif
 76 #ifdef CONFIG_BLK_DEV_IDE
 77 externintide_init(void);
 78 #endif
 79 #ifdef CONFIG_BLK_DEV_XD
 80 externintxd_init(void);
 81 #endif
 82 #ifdef CONFIG_BLK_DEV_LOOP
 83 externintloop_init(void);
 84 #endif
 85 #ifdef CONFIG_BLK_DEV_MD
 86 externintmd_init(void);
 87 #endif CONFIG_BLK_DEV_MD
 88
 89 externvoidset_device_ro(kdev_t dev,int flag);
 90 voidadd_blkdev_randomness(int major);
 91
 92 externintfloppy_init(void);
 93 externvoidrd_load(void);
 94 externintrd_init(void);
 95 externint rd_doload;/* 1 = load ramdisk, 0 = don't load */
 96 externint rd_prompt;/* 1 = prompt for ramdisk, 0 = don't prompt */
 97 externint rd_image_start;/* starting block # of image */
 98
 99 #ifdef CONFIG_BLK_DEV_INITRD
 100
 101 #define INITRD_MINOR 250/* shouldn't collide with /dev/ram* too soon ... */
 102
 103 externunsigned long initrd_start,initrd_end;
 104 externint mount_initrd;/* zero if initrd should not be mounted */
 105 voidinitrd_init(void);
 106
 107 #endif
 108
 109 #define RO_IOCTLS(dev,where) \
 110  case BLKROSET: if (!suser()) return -EACCES; \
 111  set_device_ro((dev),get_fs_long((long *) (where))); return 0; \
 112  case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \
 113  if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; }
 114
 115 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
 116
 117 /*
 118  * Add entries as needed.
 119  */
 120
 121 #ifdef IDE_DRIVER
 122
 123 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
 124 #define DEVICE_ON(device)/* nothing */
 125 #define DEVICE_OFF(device)/* nothing */
 126
 127 #elif (MAJOR_NR == RAMDISK_MAJOR)
 128
 129 /* ram disk */
 130 #define DEVICE_NAME"ramdisk"
 131 #define DEVICE_REQUEST rd_request
 132 #define DEVICE_NR(device) (MINOR(device))
 133 #define DEVICE_ON(device)
 134 #define DEVICE_OFF(device)
 135 #define DEVICE_NO_RANDOM
 136
 137 #elif (MAJOR_NR == FLOPPY_MAJOR)
 138
 139 static voidfloppy_off(unsigned int nr);
 140
 141 #define DEVICE_NAME"floppy"
 142 #define DEVICE_INTR do_floppy
 143 #define DEVICE_REQUEST do_fd_request
 144 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
 145 #define DEVICE_ON(device)
 146 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 147
 148 #elif (MAJOR_NR == HD_MAJOR)
 149
 150 /* harddisk: timeout is 6 seconds.. */
 151 #define DEVICE_NAME"harddisk"
 152 #define DEVICE_INTR do_hd
 153 #define DEVICE_TIMEOUT HD_TIMER
 154 #define TIMEOUT_VALUE (6*HZ)
 155 #define DEVICE_REQUEST do_hd_request
 156 #define DEVICE_NR(device) (MINOR(device)>>6)
 157 #define DEVICE_ON(device)
 158 #define DEVICE_OFF(device)
 159
 160 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 161
 162 #define DEVICE_NAME"scsidisk"
 163 #define DEVICE_INTR do_sd
 164 #define TIMEOUT_VALUE (2*HZ)
 165 #define DEVICE_REQUEST do_sd_request
 166 #define DEVICE_NR(device) (MINOR(device) >> 4)
 167 #define DEVICE_ON(device)
 168 #define DEVICE_OFF(device)
 169
 170 /* Kludge to use the same number for both char and block major numbers */
 171 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
 172
 173 #ifndef MD_PERSONALITY
 174
 175 #define DEVICE_NAME"Multiple devices driver"
 176 #define DEVICE_REQUEST do_md_request
 177 #define DEVICE_NR(device) (MINOR(device))
 178 #define DEVICE_ON(device)
 179 #define DEVICE_OFF(device)
 180
 181 #endif
 182
 183 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 184
 185 #define DEVICE_NAME"scsitape"
 186 #define DEVICE_INTR do_st
 187 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 188 #define DEVICE_ON(device)
 189 #define DEVICE_OFF(device)
 190
 191 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 192
 193 #define DEVICE_NAME"CD-ROM"
 194 #define DEVICE_INTR do_sr
 195 #define DEVICE_REQUEST do_sr_request
 196 #define DEVICE_NR(device) (MINOR(device))
 197 #define DEVICE_ON(device)
 198 #define DEVICE_OFF(device)
 199
 200 #elif (MAJOR_NR == XT_DISK_MAJOR)
 201
 202 #define DEVICE_NAME"xt disk"
 203 #define DEVICE_REQUEST do_xd_request
 204 #define DEVICE_NR(device) (MINOR(device) >> 6)
 205 #define DEVICE_ON(device)
 206 #define DEVICE_OFF(device)
 207
 208 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 209
 210 #define DEVICE_NAME"CDU31A"
 211 #define DEVICE_REQUEST do_cdu31a_request
 212 #define DEVICE_NR(device) (MINOR(device))
 213 #define DEVICE_ON(device)
 214 #define DEVICE_OFF(device)
 215
 216 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 217
 218 #define DEVICE_NAME"Mitsumi CD-ROM"
 219 /* #define DEVICE_INTR do_mcd */
 220 #define DEVICE_REQUEST do_mcd_request
 221 #define DEVICE_NR(device) (MINOR(device))
 222 #define DEVICE_ON(device)
 223 #define DEVICE_OFF(device)
 224
 225 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
 226
 227 #define DEVICE_NAME"Mitsumi CD-ROM"
 228 /* #define DEVICE_INTR do_mcdx */
 229 #define DEVICE_REQUEST do_mcdx_request
 230 #define DEVICE_NR(device) (MINOR(device))
 231 #define DEVICE_ON(device)
 232 #define DEVICE_OFF(device)
 233
 234 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 235
 236 #define DEVICE_NAME"Matsushita CD-ROM controller #1"
 237 #define DEVICE_REQUEST do_sbpcd_request
 238 #define DEVICE_NR(device) (MINOR(device))
 239 #define DEVICE_ON(device)
 240 #define DEVICE_OFF(device)
 241
 242 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 243
 244 #define DEVICE_NAME"Matsushita CD-ROM controller #2"
 245 #define DEVICE_REQUEST do_sbpcd2_request
 246 #define DEVICE_NR(device) (MINOR(device))
 247 #define DEVICE_ON(device)
 248 #define DEVICE_OFF(device)
 249
 250 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 251
 252 #define DEVICE_NAME"Matsushita CD-ROM controller #3"
 253 #define DEVICE_REQUEST do_sbpcd3_request
 254 #define DEVICE_NR(device) (MINOR(device))
 255 #define DEVICE_ON(device)
 256 #define DEVICE_OFF(device)
 257
 258 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 259
 260 #define DEVICE_NAME"Matsushita CD-ROM controller #4"
 261 #define DEVICE_REQUEST do_sbpcd4_request
 262 #define DEVICE_NR(device) (MINOR(device))
 263 #define DEVICE_ON(device)
 264 #define DEVICE_OFF(device)
 265
 266 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 267
 268 #define DEVICE_NAME"Aztech CD-ROM"
 269 #define DEVICE_REQUEST do_aztcd_request
 270 #define DEVICE_NR(device) (MINOR(device))
 271 #define DEVICE_ON(device)
 272 #define DEVICE_OFF(device)
 273
 274 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 275
 276 #define DEVICE_NAME"SONY-CDU535"
 277 #define DEVICE_INTR do_cdu535
 278 #define DEVICE_REQUEST do_cdu535_request
 279 #define DEVICE_NR(device) (MINOR(device))
 280 #define DEVICE_ON(device)
 281 #define DEVICE_OFF(device)
 282
 283 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
 284
 285 #define DEVICE_NAME"Goldstar R420"
 286 #define DEVICE_REQUEST do_gscd_request
 287 #define DEVICE_NR(device) (MINOR(device))
 288 #define DEVICE_ON(device)
 289 #define DEVICE_OFF(device)
 290
 291 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
 292 #define DEVICE_NAME"Philips/LMS cd-rom cm206"
 293 #define DEVICE_REQUEST do_cm206_request
 294 #define DEVICE_NR(device) (MINOR(device))
 295 #define DEVICE_ON(device)
 296 #define DEVICE_OFF(device)
 297
 298 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
 299
 300 #define DEVICE_NAME"DOLPHIN 8000AT CD-ROM"
 301 #define DEVICE_REQUEST do_optcd_request
 302 #define DEVICE_NR(device) (MINOR(device))
 303 #define DEVICE_ON(device)
 304 #define DEVICE_OFF(device)
 305
 306 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
 307
 308 #define DEVICE_NAME"Sanyo H94A CD-ROM"
 309 #define DEVICE_REQUEST do_sjcd_request
 310 #define DEVICE_NR(device) (MINOR(device))
 311 #define DEVICE_ON(device)
 312 #define DEVICE_OFF(device)
 313
 314 #endif/* MAJOR_NR == whatever */
 315
 316 #if ((MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) && !defined(MD_DRIVER))
 317
 318 #ifndef CURRENT
 319 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 320 #endif
 321
 322 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
 323
 324 #ifdef DEVICE_INTR
 325 void(*DEVICE_INTR)(void) = NULL;
 326 #endif
 327 #ifdef DEVICE_TIMEOUT
 328
 329 #define SET_TIMER \
 330 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 331 (timer_active |= 1<<DEVICE_TIMEOUT))
 332
 333 #define CLEAR_TIMER \
 334 timer_active &= ~(1<<DEVICE_TIMEOUT)
 335
 336 #define SET_INTR(x) \
 337 if ((DEVICE_INTR = (x)) != NULL) \
 338  SET_TIMER; \
 339 else \
 340  CLEAR_TIMER;
 341
 342 #else
 343
 344 #define SET_INTR(x) (DEVICE_INTR = (x))
 345
 346 #endif/* DEVICE_TIMEOUT */
 347
 348 #ifndef MD_PERSONALITY
 349 static void(DEVICE_REQUEST)(void);
 350 #endif
 351
 352 #ifdef DEVICE_INTR
 353 #define CLEAR_INTR SET_INTR(NULL)
 354 #else
 355 #define CLEAR_INTR
 356 #endif
 357
 358 #define INIT_REQUEST \
 359  if (!CURRENT) {\
 360  CLEAR_INTR; \
 361  return; \
 362  } \
 363  if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
 364  panic(DEVICE_NAME": request list destroyed"); \
 365  if (CURRENT->bh) { \
 366  if (!buffer_locked(CURRENT->bh)) \
 367  panic(DEVICE_NAME": block not locked"); \
 368  }
 369
 370 #endif/* (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) */
 371
 372 /* end_request() - SCSI devices have their own version */
 373 /* - IDE drivers have their own copy too */
 374
 375 #if ! SCSI_MAJOR(MAJOR_NR) || (defined(MD_DRIVER) && !defined(MD_PERSONALITY))
 376
 377 #if defined(IDE_DRIVER) && !defined(_IDE_C)/* shared copy for IDE modules */
 378 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);
 379 #else
 380
 381 #ifdef IDE_DRIVER
 382 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {
 383 struct request *req = hwgroup->rq;
 384 #elif defined(MD_DRIVER)
 385 static voidend_request(int uptodate,struct request * req) {
 386 #else
 387 static voidend_request(int uptodate) {
 388 struct request *req = CURRENT;
 389 #endif/* IDE_DRIVER */
 390 struct buffer_head * bh;
 391
 392  req->errors =0;
 393 if(!uptodate) {
 394 printk("end_request: I/O error, dev %s, sector %lu\n",
 395 kdevname(req->rq_dev), req->sector);
 396  req->nr_sectors--;
 397  req->nr_sectors &= ~SECTOR_MASK;
 398  req->sector += (BLOCK_SIZE /512);
 399  req->sector &= ~SECTOR_MASK;
 400 }
 401
 402 if((bh = req->bh) != NULL) {
 403  req->bh = bh->b_reqnext;
 404  bh->b_reqnext = NULL;
 405 mark_buffer_uptodate(bh, uptodate);
 406 unlock_buffer(bh);
 407 if((bh = req->bh) != NULL) {
 408  req->current_nr_sectors = bh->b_size >>9;
 409 if(req->nr_sectors < req->current_nr_sectors) {
 410  req->nr_sectors = req->current_nr_sectors;
 411 printk("end_request: buffer-list destroyed\n");
 412 }
 413  req->buffer = bh->b_data;
 414 return;
 415 }
 416 }
 417 #ifndef DEVICE_NO_RANDOM
 418 add_blkdev_randomness(MAJOR(req->rq_dev));
 419 #endif
 420 #ifdef IDE_DRIVER
 421  blk_dev[MAJOR(req->rq_dev)].current_request = req->next;
 422  hwgroup->rq = NULL;
 423 #elif !defined(MD_DRIVER)
 424 DEVICE_OFF(req->rq_dev);
 425  CURRENT = req->next;
 426 #endif/* IDE_DRIVER */
 427 if(req->sem != NULL)
 428 up(req->sem);
 429  req->rq_status = RQ_INACTIVE;
 430 wake_up(&wait_for_request);
 431 }
 432 #endif/* defined(IDE_DRIVER) && !defined(_IDE_C) */
 433 #endif/* ! SCSI_MAJOR(MAJOR_NR) */
 434
 435 #ifdef MD_PERSONALITY
 436 extern inlinevoidend_redirect(struct request *req)
 437 {
 438 struct buffer_head * bh;
 439
 440  req->errors =0;
 441
 442 if((bh = req->bh) != NULL)
 443 {
 444  req->bh = bh->b_reqnext;
 445  bh->b_reqnext = NULL;
 446
 447 if((bh = req->bh) != NULL)
 448 {
 449  req->sector += req->current_nr_sectors;
 450  req->current_nr_sectors = bh->b_size >>9;
 451
 452 if(req->nr_sectors < req->current_nr_sectors)
 453 {
 454  req->nr_sectors = req->current_nr_sectors;
 455 printk("end_redirect : buffer-list destroyed\n");
 456 }
 457
 458  req->buffer = bh->b_data;
 459 return;
 460 }
 461 }
 462 }
 463 #endif/* MD_PERSONALITY */
 464
 465 #endif/* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 466
 467 #endif/* _BLK_H */