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