include/linux/blk.h

Name: Public Git Hosting - davej-history.git/blob - include/linux/blk.h
Rating: 4.6 (497 reviews)
 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 #define RO_IOCTLS(dev,where) \
 100  case BLKROSET: if (!suser()) return -EACCES; \
 101  set_device_ro((dev),get_fs_long((long *) (where))); return 0; \
 102  case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \
 103  if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; }
 104
 105 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
 106
 107 /*
 108  * Add entries as needed.
 109  */
 110
 111 #ifdef IDE_DRIVER
 112
 113 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
 114 #define DEVICE_ON(device)/* nothing */
 115 #define DEVICE_OFF(device)/* nothing */
 116
 117 #elif (MAJOR_NR == RAMDISK_MAJOR)
 118
 119 /* ram disk */
 120 #define DEVICE_NAME"ramdisk"
 121 #define DEVICE_REQUEST rd_request
 122 #define DEVICE_NR(device) (MINOR(device))
 123 #define DEVICE_ON(device)
 124 #define DEVICE_OFF(device)
 125 #define DEVICE_NO_RANDOM
 126
 127 #elif (MAJOR_NR == FLOPPY_MAJOR)
 128
 129 static voidfloppy_off(unsigned int nr);
 130
 131 #define DEVICE_NAME"floppy"
 132 #define DEVICE_INTR do_floppy
 133 #define DEVICE_REQUEST do_fd_request
 134 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
 135 #define DEVICE_ON(device)
 136 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 137
 138 #elif (MAJOR_NR == HD_MAJOR)
 139
 140 /* harddisk: timeout is 6 seconds.. */
 141 #define DEVICE_NAME"harddisk"
 142 #define DEVICE_INTR do_hd
 143 #define DEVICE_TIMEOUT HD_TIMER
 144 #define TIMEOUT_VALUE (6*HZ)
 145 #define DEVICE_REQUEST do_hd_request
 146 #define DEVICE_NR(device) (MINOR(device)>>6)
 147 #define DEVICE_ON(device)
 148 #define DEVICE_OFF(device)
 149
 150 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 151
 152 #define DEVICE_NAME"scsidisk"
 153 #define DEVICE_INTR do_sd
 154 #define TIMEOUT_VALUE (2*HZ)
 155 #define DEVICE_REQUEST do_sd_request
 156 #define DEVICE_NR(device) (MINOR(device) >> 4)
 157 #define DEVICE_ON(device)
 158 #define DEVICE_OFF(device)
 159
 160 /* Kludge to use the same number for both char and block major numbers */
 161 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
 162
 163 #ifndef MD_PERSONALITY
 164
 165 #define DEVICE_NAME"Multiple devices driver"
 166 #define DEVICE_REQUEST do_md_request
 167 #define DEVICE_NR(device) (MINOR(device))
 168 #define DEVICE_ON(device)
 169 #define DEVICE_OFF(device)
 170
 171 #endif
 172
 173 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 174
 175 #define DEVICE_NAME"scsitape"
 176 #define DEVICE_INTR do_st
 177 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 178 #define DEVICE_ON(device)
 179 #define DEVICE_OFF(device)
 180
 181 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 182
 183 #define DEVICE_NAME"CD-ROM"
 184 #define DEVICE_INTR do_sr
 185 #define DEVICE_REQUEST do_sr_request
 186 #define DEVICE_NR(device) (MINOR(device))
 187 #define DEVICE_ON(device)
 188 #define DEVICE_OFF(device)
 189
 190 #elif (MAJOR_NR == XT_DISK_MAJOR)
 191
 192 #define DEVICE_NAME"xt disk"
 193 #define DEVICE_REQUEST do_xd_request
 194 #define DEVICE_NR(device) (MINOR(device) >> 6)
 195 #define DEVICE_ON(device)
 196 #define DEVICE_OFF(device)
 197
 198 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 199
 200 #define DEVICE_NAME"CDU31A"
 201 #define DEVICE_REQUEST do_cdu31a_request
 202 #define DEVICE_NR(device) (MINOR(device))
 203 #define DEVICE_ON(device)
 204 #define DEVICE_OFF(device)
 205
 206 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 207
 208 #define DEVICE_NAME"Mitsumi CD-ROM"
 209 /* #define DEVICE_INTR do_mcd */
 210 #define DEVICE_REQUEST do_mcd_request
 211 #define DEVICE_NR(device) (MINOR(device))
 212 #define DEVICE_ON(device)
 213 #define DEVICE_OFF(device)
 214
 215 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
 216
 217 #define DEVICE_NAME"Mitsumi CD-ROM"
 218 /* #define DEVICE_INTR do_mcdx */
 219 #define DEVICE_REQUEST do_mcdx_request
 220 #define DEVICE_NR(device) (MINOR(device))
 221 #define DEVICE_ON(device)
 222 #define DEVICE_OFF(device)
 223
 224 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 225
 226 #define DEVICE_NAME"Matsushita CD-ROM controller #1"
 227 #define DEVICE_REQUEST do_sbpcd_request
 228 #define DEVICE_NR(device) (MINOR(device))
 229 #define DEVICE_ON(device)
 230 #define DEVICE_OFF(device)
 231
 232 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 233
 234 #define DEVICE_NAME"Matsushita CD-ROM controller #2"
 235 #define DEVICE_REQUEST do_sbpcd2_request
 236 #define DEVICE_NR(device) (MINOR(device))
 237 #define DEVICE_ON(device)
 238 #define DEVICE_OFF(device)
 239
 240 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 241
 242 #define DEVICE_NAME"Matsushita CD-ROM controller #3"
 243 #define DEVICE_REQUEST do_sbpcd3_request
 244 #define DEVICE_NR(device) (MINOR(device))
 245 #define DEVICE_ON(device)
 246 #define DEVICE_OFF(device)
 247
 248 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 249
 250 #define DEVICE_NAME"Matsushita CD-ROM controller #4"
 251 #define DEVICE_REQUEST do_sbpcd4_request
 252 #define DEVICE_NR(device) (MINOR(device))
 253 #define DEVICE_ON(device)
 254 #define DEVICE_OFF(device)
 255
 256 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 257
 258 #define DEVICE_NAME"Aztech CD-ROM"
 259 #define DEVICE_REQUEST do_aztcd_request
 260 #define DEVICE_NR(device) (MINOR(device))
 261 #define DEVICE_ON(device)
 262 #define DEVICE_OFF(device)
 263
 264 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 265
 266 #define DEVICE_NAME"SONY-CDU535"
 267 #define DEVICE_INTR do_cdu535
 268 #define DEVICE_REQUEST do_cdu535_request
 269 #define DEVICE_NR(device) (MINOR(device))
 270 #define DEVICE_ON(device)
 271 #define DEVICE_OFF(device)
 272
 273 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
 274
 275 #define DEVICE_NAME"Goldstar R420"
 276 #define DEVICE_REQUEST do_gscd_request
 277 #define DEVICE_NR(device) (MINOR(device))
 278 #define DEVICE_ON(device)
 279 #define DEVICE_OFF(device)
 280
 281 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
 282 #define DEVICE_NAME"Philips/LMS cd-rom cm206"
 283 #define DEVICE_REQUEST do_cm206_request
 284 #define DEVICE_NR(device) (MINOR(device))
 285 #define DEVICE_ON(device)
 286 #define DEVICE_OFF(device)
 287
 288 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
 289
 290 #define DEVICE_NAME"DOLPHIN 8000AT CD-ROM"
 291 #define DEVICE_REQUEST do_optcd_request
 292 #define DEVICE_NR(device) (MINOR(device))
 293 #define DEVICE_ON(device)
 294 #define DEVICE_OFF(device)
 295
 296 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
 297
 298 #define DEVICE_NAME"Sanyo H94A CD-ROM"
 299 #define DEVICE_REQUEST do_sjcd_request
 300 #define DEVICE_NR(device) (MINOR(device))
 301 #define DEVICE_ON(device)
 302 #define DEVICE_OFF(device)
 303
 304 #endif/* MAJOR_NR == whatever */
 305
 306 #if ((MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) && !defined(MD_DRIVER))
 307
 308 #ifndef CURRENT
 309 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 310 #endif
 311
 312 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
 313
 314 #ifdef DEVICE_INTR
 315 void(*DEVICE_INTR)(void) = NULL;
 316 #endif
 317 #ifdef DEVICE_TIMEOUT
 318
 319 #define SET_TIMER \
 320 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 321 (timer_active |= 1<<DEVICE_TIMEOUT))
 322
 323 #define CLEAR_TIMER \
 324 timer_active &= ~(1<<DEVICE_TIMEOUT)
 325
 326 #define SET_INTR(x) \
 327 if ((DEVICE_INTR = (x)) != NULL) \
 328  SET_TIMER; \
 329 else \
 330  CLEAR_TIMER;
 331
 332 #else
 333
 334 #define SET_INTR(x) (DEVICE_INTR = (x))
 335
 336 #endif/* DEVICE_TIMEOUT */
 337
 338 #ifndef MD_PERSONALITY
 339 static void(DEVICE_REQUEST)(void);
 340 #endif
 341
 342 #ifdef DEVICE_INTR
 343 #define CLEAR_INTR SET_INTR(NULL)
 344 #else
 345 #define CLEAR_INTR
 346 #endif
 347
 348 #define INIT_REQUEST \
 349  if (!CURRENT) {\
 350  CLEAR_INTR; \
 351  return; \
 352  } \
 353  if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
 354  panic(DEVICE_NAME": request list destroyed"); \
 355  if (CURRENT->bh) { \
 356  if (!buffer_locked(CURRENT->bh)) \
 357  panic(DEVICE_NAME": block not locked"); \
 358  }
 359
 360 #endif/* (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) */
 361
 362 /* end_request() - SCSI devices have their own version */
 363 /* - IDE drivers have their own copy too */
 364
 365 #if ! SCSI_MAJOR(MAJOR_NR) || (defined(MD_DRIVER) && !defined(MD_PERSONALITY))
 366
 367 #if defined(IDE_DRIVER) && !defined(_IDE_C)/* shared copy for IDE modules */
 368 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);
 369 #else
 370
 371 #ifdef IDE_DRIVER
 372 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {
 373 struct request *req = hwgroup->rq;
 374 #elif defined(MD_DRIVER)
 375 static voidend_request(int uptodate,struct request * req) {
 376 #else
 377 static voidend_request(int uptodate) {
 378 struct request *req = CURRENT;
 379 #endif/* IDE_DRIVER */
 380 struct buffer_head * bh;
 381
 382  req->errors =0;
 383 if(!uptodate) {
 384 printk("end_request: I/O error, dev %s, sector %lu\n",
 385 kdevname(req->rq_dev), req->sector);
 386  req->nr_sectors--;
 387  req->nr_sectors &= ~SECTOR_MASK;
 388  req->sector += (BLOCK_SIZE /512);
 389  req->sector &= ~SECTOR_MASK;
 390 }
 391
 392 if((bh = req->bh) != NULL) {
 393  req->bh = bh->b_reqnext;
 394  bh->b_reqnext = NULL;
 395 mark_buffer_uptodate(bh, uptodate);
 396 unlock_buffer(bh);
 397 if((bh = req->bh) != NULL) {
 398  req->current_nr_sectors = bh->b_size >>9;
 399 if(req->nr_sectors < req->current_nr_sectors) {
 400  req->nr_sectors = req->current_nr_sectors;
 401 printk("end_request: buffer-list destroyed\n");
 402 }
 403  req->buffer = bh->b_data;
 404 return;
 405 }
 406 }
 407 #ifndef DEVICE_NO_RANDOM
 408 add_blkdev_randomness(MAJOR(req->rq_dev));
 409 #endif
 410 #ifdef IDE_DRIVER
 411  blk_dev[MAJOR(req->rq_dev)].current_request = req->next;
 412  hwgroup->rq = NULL;
 413 #elif !defined(MD_DRIVER)
 414 DEVICE_OFF(req->rq_dev);
 415  CURRENT = req->next;
 416 #endif/* IDE_DRIVER */
 417 if(req->sem != NULL)
 418 up(req->sem);
 419  req->rq_status = RQ_INACTIVE;
 420 wake_up(&wait_for_request);
 421 }
 422 #endif/* defined(IDE_DRIVER) && !defined(_IDE_C) */
 423 #endif/* ! SCSI_MAJOR(MAJOR_NR) */
 424
 425 #ifdef MD_PERSONALITY
 426 extern inlinevoidend_redirect(struct request *req)
 427 {
 428 struct buffer_head * bh;
 429
 430  req->errors =0;
 431
 432 if((bh = req->bh) != NULL)
 433 {
 434  req->bh = bh->b_reqnext;
 435  bh->b_reqnext = NULL;
 436
 437 if((bh = req->bh) != NULL)
 438 {
 439  req->sector += req->current_nr_sectors;
 440  req->current_nr_sectors = bh->b_size >>9;
 441
 442 if(req->nr_sectors < req->current_nr_sectors)
 443 {
 444  req->nr_sectors = req->current_nr_sectors;
 445 printk("end_redirect : buffer-list destroyed\n");
 446 }
 447
 448  req->buffer = bh->b_data;
 449 return;
 450 }
 451 }
 452 }
 453 #endif/* MD_PERSONALITY */
 454
 455 #endif/* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 456
 457 #endif/* _BLK_H */