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: Note that
 17  * reads always go before writes. This is natural: reads
 18  * are much more time-critical than writes.
 19  */
 20 #define IN_ORDER(s1,s2) \
 21 ((s1)->cmd < (s2)->cmd || ((s1)->cmd == (s2)->cmd && \
 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 #ifdef IDE_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_BLK_DEV_HD
 71 externinthd_init(void);
 72 #endif
 73 #ifdef CONFIG_BLK_DEV_IDE
 74 externintide_init(void);
 75 #endif
 76 #ifdef CONFIG_BLK_DEV_XD
 77 externintxd_init(void);
 78 #endif
 79
 80 externvoidset_device_ro(kdev_t dev,int flag);
 81 voidadd_blkdev_randomness(int major);
 82
 83 externintfloppy_init(void);
 84 externvoidrd_load(void);
 85 externintrd_init(void);
 86 externint rd_doload;/* 1 = load ramdisk, 0 = don't load */
 87 externint rd_prompt;/* 1 = prompt for ramdisk, 0 = don't prompt */
 88 externint rd_image_start;/* starting block # of image */
 89
 90 #define RO_IOCTLS(dev,where) \
 91  case BLKROSET: if (!suser()) return -EACCES; \
 92  set_device_ro((dev),get_fs_long((long *) (where))); return 0; \
 93  case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \
 94  if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; }
 95
 96 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
 97
 98 /*
 99  * Add entries as needed.
 100  */
 101
 102 #ifdef IDE_DRIVER
 103
 104 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
 105 #define DEVICE_ON(device)/* nothing */
 106 #define DEVICE_OFF(device)/* nothing */
 107
 108 #elif (MAJOR_NR == RAMDISK_MAJOR)
 109
 110 /* ram disk */
 111 #define DEVICE_NAME"ramdisk"
 112 #define DEVICE_REQUEST rd_request
 113 #define DEVICE_NR(device) (MINOR(device))
 114 #define DEVICE_ON(device)
 115 #define DEVICE_OFF(device)
 116 #define DEVICE_NO_RANDOM
 117
 118 #elif (MAJOR_NR == FLOPPY_MAJOR)
 119
 120 static voidfloppy_off(unsigned int nr);
 121
 122 #define DEVICE_NAME"floppy"
 123 #define DEVICE_INTR do_floppy
 124 #define DEVICE_REQUEST do_fd_request
 125 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
 126 #define DEVICE_ON(device)
 127 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 128
 129 #elif (MAJOR_NR == HD_MAJOR)
 130
 131 /* harddisk: timeout is 6 seconds.. */
 132 #define DEVICE_NAME"harddisk"
 133 #define DEVICE_INTR do_hd
 134 #define DEVICE_TIMEOUT HD_TIMER
 135 #define TIMEOUT_VALUE (6*HZ)
 136 #define DEVICE_REQUEST do_hd_request
 137 #define DEVICE_NR(device) (MINOR(device)>>6)
 138 #define DEVICE_ON(device)
 139 #define DEVICE_OFF(device)
 140
 141 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 142
 143 #define DEVICE_NAME"scsidisk"
 144 #define DEVICE_INTR do_sd
 145 #define TIMEOUT_VALUE (2*HZ)
 146 #define DEVICE_REQUEST do_sd_request
 147 #define DEVICE_NR(device) (MINOR(device) >> 4)
 148 #define DEVICE_ON(device)
 149 #define DEVICE_OFF(device)
 150
 151 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 152
 153 #define DEVICE_NAME"scsitape"
 154 #define DEVICE_INTR do_st
 155 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 156 #define DEVICE_ON(device)
 157 #define DEVICE_OFF(device)
 158
 159 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 160
 161 #define DEVICE_NAME"CD-ROM"
 162 #define DEVICE_INTR do_sr
 163 #define DEVICE_REQUEST do_sr_request
 164 #define DEVICE_NR(device) (MINOR(device))
 165 #define DEVICE_ON(device)
 166 #define DEVICE_OFF(device)
 167
 168 #elif (MAJOR_NR == XT_DISK_MAJOR)
 169
 170 #define DEVICE_NAME"xt disk"
 171 #define DEVICE_REQUEST do_xd_request
 172 #define DEVICE_NR(device) (MINOR(device) >> 6)
 173 #define DEVICE_ON(device)
 174 #define DEVICE_OFF(device)
 175
 176 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 177
 178 #define DEVICE_NAME"CDU31A"
 179 #define DEVICE_REQUEST do_cdu31a_request
 180 #define DEVICE_NR(device) (MINOR(device))
 181 #define DEVICE_ON(device)
 182 #define DEVICE_OFF(device)
 183
 184 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 185
 186 #define DEVICE_NAME"Mitsumi CD-ROM"
 187 /* #define DEVICE_INTR do_mcd */
 188 #define DEVICE_REQUEST do_mcd_request
 189 #define DEVICE_NR(device) (MINOR(device))
 190 #define DEVICE_ON(device)
 191 #define DEVICE_OFF(device)
 192
 193 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
 194
 195 #define DEVICE_NAME"Mitsumi CD-ROM"
 196 /* #define DEVICE_INTR do_mcdx */
 197 #define DEVICE_REQUEST do_mcdx_request
 198 #define DEVICE_NR(device) (MINOR(device))
 199 #define DEVICE_ON(device)
 200 #define DEVICE_OFF(device)
 201
 202 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 203
 204 #define DEVICE_NAME"Matsushita CD-ROM controller #1"
 205 #define DEVICE_REQUEST do_sbpcd_request
 206 #define DEVICE_NR(device) (MINOR(device))
 207 #define DEVICE_ON(device)
 208 #define DEVICE_OFF(device)
 209
 210 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 211
 212 #define DEVICE_NAME"Matsushita CD-ROM controller #2"
 213 #define DEVICE_REQUEST do_sbpcd2_request
 214 #define DEVICE_NR(device) (MINOR(device))
 215 #define DEVICE_ON(device)
 216 #define DEVICE_OFF(device)
 217
 218 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 219
 220 #define DEVICE_NAME"Matsushita CD-ROM controller #3"
 221 #define DEVICE_REQUEST do_sbpcd3_request
 222 #define DEVICE_NR(device) (MINOR(device))
 223 #define DEVICE_ON(device)
 224 #define DEVICE_OFF(device)
 225
 226 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 227
 228 #define DEVICE_NAME"Matsushita CD-ROM controller #4"
 229 #define DEVICE_REQUEST do_sbpcd4_request
 230 #define DEVICE_NR(device) (MINOR(device))
 231 #define DEVICE_ON(device)
 232 #define DEVICE_OFF(device)
 233
 234 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 235
 236 #define DEVICE_NAME"Aztech CD-ROM"
 237 #define DEVICE_REQUEST do_aztcd_request
 238 #define DEVICE_NR(device) (MINOR(device))
 239 #define DEVICE_ON(device)
 240 #define DEVICE_OFF(device)
 241
 242 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 243
 244 #define DEVICE_NAME"SONY-CDU535"
 245 #define DEVICE_INTR do_cdu535
 246 #define DEVICE_REQUEST do_cdu535_request
 247 #define DEVICE_NR(device) (MINOR(device))
 248 #define DEVICE_ON(device)
 249 #define DEVICE_OFF(device)
 250
 251 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
 252
 253 #define DEVICE_NAME"Goldstar R420"
 254 #define DEVICE_REQUEST do_gscd_request
 255 #define DEVICE_NR(device) (MINOR(device))
 256 #define DEVICE_ON(device)
 257 #define DEVICE_OFF(device)
 258
 259 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
 260 #define DEVICE_NAME"Philips/LMS cd-rom cm206"
 261 #define DEVICE_REQUEST do_cm206_request
 262 #define DEVICE_NR(device) (MINOR(device))
 263 #define DEVICE_ON(device)
 264 #define DEVICE_OFF(device)
 265
 266 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
 267
 268 #define DEVICE_NAME"DOLPHIN 8000AT CD-ROM"
 269 #define DEVICE_REQUEST do_optcd_request
 270 #define DEVICE_NR(device) (MINOR(device))
 271 #define DEVICE_ON(device)
 272 #define DEVICE_OFF(device)
 273
 274 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
 275
 276 #define DEVICE_NAME"Sanyo H94A CD-ROM"
 277 #define DEVICE_REQUEST do_sjcd_request
 278 #define DEVICE_NR(device) (MINOR(device))
 279 #define DEVICE_ON(device)
 280 #define DEVICE_OFF(device)
 281
 282 #endif/* MAJOR_NR == whatever */
 283
 284 #if (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER)
 285
 286 #ifndef CURRENT
 287 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 288 #endif
 289
 290 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
 291
 292 #ifdef DEVICE_INTR
 293 void(*DEVICE_INTR)(void) = NULL;
 294 #endif
 295 #ifdef DEVICE_TIMEOUT
 296
 297 #define SET_TIMER \
 298 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 299 (timer_active |= 1<<DEVICE_TIMEOUT))
 300
 301 #define CLEAR_TIMER \
 302 timer_active &= ~(1<<DEVICE_TIMEOUT)
 303
 304 #define SET_INTR(x) \
 305 if ((DEVICE_INTR = (x)) != NULL) \
 306  SET_TIMER; \
 307 else \
 308  CLEAR_TIMER;
 309
 310 #else
 311
 312 #define SET_INTR(x) (DEVICE_INTR = (x))
 313
 314 #endif/* DEVICE_TIMEOUT */
 315
 316 static void(DEVICE_REQUEST)(void);
 317
 318 #ifdef DEVICE_INTR
 319 #define CLEAR_INTR SET_INTR(NULL)
 320 #else
 321 #define CLEAR_INTR
 322 #endif
 323
 324 #define INIT_REQUEST \
 325  if (!CURRENT) {\
 326  CLEAR_INTR; \
 327  return; \
 328  } \
 329  if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
 330  panic(DEVICE_NAME": request list destroyed"); \
 331  if (CURRENT->bh) { \
 332  if (!buffer_locked(CURRENT->bh)) \
 333  panic(DEVICE_NAME": block not locked"); \
 334  }
 335
 336 #endif/* (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) */
 337
 338 /* end_request() - SCSI devices have their own version */
 339 /* - IDE drivers have their own copy too */
 340
 341 #if ! SCSI_MAJOR(MAJOR_NR)
 342
 343 #if defined(_IDE_CD_C) || defined(_TRITON_C) || defined(_IDE_TAPE_C)/* shares copy with ide.c */
 344 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);
 345 #else
 346
 347 #ifdef IDE_DRIVER
 348 voidide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {
 349 struct request *req = hwgroup->rq;
 350 #else
 351 static voidend_request(int uptodate) {
 352 struct request *req = CURRENT;
 353 #endif/* IDE_DRIVER */
 354 struct buffer_head * bh;
 355
 356  req->errors =0;
 357 if(!uptodate) {
 358 printk("end_request: I/O error, dev %s, sector %lu\n",
 359 kdevname(req->rq_dev), req->sector);
 360  req->nr_sectors--;
 361  req->nr_sectors &= ~SECTOR_MASK;
 362  req->sector += (BLOCK_SIZE /512);
 363  req->sector &= ~SECTOR_MASK;
 364 }
 365
 366 if((bh = req->bh) != NULL) {
 367  req->bh = bh->b_reqnext;
 368  bh->b_reqnext = NULL;
 369 mark_buffer_uptodate(bh, uptodate);
 370 unlock_buffer(bh);
 371 if((bh = req->bh) != NULL) {
 372  req->current_nr_sectors = bh->b_size >>9;
 373 if(req->nr_sectors < req->current_nr_sectors) {
 374  req->nr_sectors = req->current_nr_sectors;
 375 printk("end_request: buffer-list destroyed\n");
 376 }
 377  req->buffer = bh->b_data;
 378 return;
 379 }
 380 }
 381 #ifndef DEVICE_NO_RANDOM
 382 add_blkdev_randomness(MAJOR(req->rq_dev));
 383 #endif
 384 #ifdef IDE_DRIVER
 385  blk_dev[MAJOR(req->rq_dev)].current_request = req->next;
 386  hwgroup->rq = NULL;
 387 #else
 388 DEVICE_OFF(req->rq_dev);
 389  CURRENT = req->next;
 390 #endif/* IDE_DRIVER */
 391 if(req->sem != NULL)
 392 up(req->sem);
 393  req->rq_status = RQ_INACTIVE;
 394 wake_up(&wait_for_request);
 395 }
 396 #endif/* ndef _IDE_CD_C */
 397 #endif/* ! SCSI_MAJOR(MAJOR_NR) */
 398
 399 #endif/* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 400
 401 #endif/* _BLK_H */