include/linux/blk.h

   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 #include <linux/spinlock.h>
   8
   9 /*
  10  * Spinlock for protecting the request queue which
  11  * is mucked around with in interrupts on potentially
  12  * multiple CPU's..
  13  */
  14 extern spinlock_t io_request_lock;
  15
  16 /*
  17  * Initialization functions.
  18  */
  19 extern int isp16_init(void);
  20 extern int cdu31a_init(void);
  21 extern int acsi_init(void);
  22 extern int mcd_init(void);
  23 extern int mcdx_init(void);
  24 extern int sbpcd_init(void);
  25 extern int aztcd_init(void);
  26 extern int sony535_init(void);
  27 extern int gscd_init(void);
  28 extern int cm206_init(void);
  29 extern int optcd_init(void);
  30 extern int sjcd_init(void);
  31 extern int cdi_init(void);
  32 extern int hd_init(void);
  33 extern int ide_init(void);
  34 extern int xd_init(void);
  35 extern int mfm_init(void);
  36 extern int loop_init(void);
  37 extern int md_init(void);
  38 extern int ap_init(void);
  39 extern int ddv_init(void);
  40 extern int z2_init(void);
  41 extern int swim3_init(void);
  42 extern int swimiop_init(void);
  43 extern int amiga_floppy_init(void);
  44 extern int atari_floppy_init(void);
  45 extern int nbd_init(void);
  46 extern int ez_init(void);
  47 extern int bpcd_init(void);
  48 extern int ps2esdi_init(void);
  49 extern int jsfd_init(void);
  50
  51 #if defined(CONFIG_ARCH_S390)
  52 extern int mdisk_init(void);
  53 extern int dasd_init(void);
  54 #endif /* CONFIG_ARCH_S390 */
  55
  56 extern void set_device_ro(kdev_t dev,int flag);
  57 void add_blkdev_randomness(int major);
  58
  59 extern int floppy_init(void);
  60 extern void rd_load(void);
  61 extern int rd_init(void);
  62 extern int rd_doload;           /* 1 = load ramdisk, 0 = don't load */
  63 extern int rd_prompt;           /* 1 = prompt for ramdisk, 0 = don't prompt */
  64 extern int rd_image_start;      /* starting block # of image */
  65
  66 #ifdef CONFIG_BLK_DEV_INITRD
  67
  68 #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
  69
  70 extern unsigned long initrd_start,initrd_end;
  71 extern int mount_initrd; /* zero if initrd should not be mounted */
  72 extern int initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
  73 void initrd_init(void);
  74
  75 #endif
  76
  77
  78 /*
  79  * end_request() and friends. Must be called with the request queue spinlock
  80  * acquired. All functions called within end_request() _must_be_ atomic.
  81  *
  82  * Several drivers define their own end_request and call
  83  * end_that_request_first() and end_that_request_last()
  84  * for parts of the original function. This prevents
  85  * code duplication in drivers.
  86  */
  87
  88 static inline void blkdev_dequeue_request(struct request * req)
  89 {
  90         if (req->e) {
  91                 req->e->dequeue_fn(req);
  92                 req->e = NULL;
  93         }
  94         list_del(&req->queue);
  95 }
  96
  97 int end_that_request_first(struct request *req, int uptodate, char *name);
  98 void end_that_request_last(struct request *req);
  99
 100 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
 101
 102 #undef DEVICE_ON
 103 #undef DEVICE_OFF
 104
 105 /*
 106  * Add entries as needed.
 107  */
 108
 109 #ifdef IDE_DRIVER
 110
 111 #define DEVICE_NR(device)       (MINOR(device) >> PARTN_BITS)
 112 #define DEVICE_NAME "ide"
 113
 114 #elif (MAJOR_NR == RAMDISK_MAJOR)
 115
 116 /* ram disk */
 117 #define DEVICE_NAME "ramdisk"
 118 #define DEVICE_NR(device) (MINOR(device))
 119 #define DEVICE_NO_RANDOM
 120
 121 #elif (MAJOR_NR == Z2RAM_MAJOR)
 122
 123 /* Zorro II Ram */
 124 #define DEVICE_NAME "Z2RAM"
 125 #define DEVICE_REQUEST do_z2_request
 126 #define DEVICE_NR(device) (MINOR(device))
 127
 128 #elif (MAJOR_NR == FLOPPY_MAJOR)
 129
 130 static void floppy_off(unsigned int nr);
 131
 132 #define DEVICE_NAME "floppy"
 133 #define DEVICE_INTR do_floppy
 134 #define DEVICE_REQUEST do_fd_request
 135 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
 136 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 137
 138 #elif (MAJOR_NR == HD_MAJOR)
 139
 140 /* Hard disk:  timeout is 6 seconds. */
 141 #define DEVICE_NAME "hard disk"
 142 #define DEVICE_INTR do_hd
 143 #define TIMEOUT_VALUE (6*HZ)
 144 #define DEVICE_REQUEST do_hd_request
 145 #define DEVICE_NR(device) (MINOR(device)>>6)
 146
 147 #elif (SCSI_DISK_MAJOR(MAJOR_NR))
 148
 149 #define DEVICE_NAME "scsidisk"
 150 #define TIMEOUT_VALUE (2*HZ)
 151 #define DEVICE_NR(device) (((MAJOR(device) & SD_MAJOR_MASK) << (8 - 4)) + (MINOR(device) >> 4))
 152
 153 /* Kludge to use the same number for both char and block major numbers */
 154 #elif  (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
 155
 156 #define DEVICE_NAME "Multiple devices driver"
 157 #define DEVICE_REQUEST do_md_request
 158 #define DEVICE_NR(device) (MINOR(device))
 159
 160 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 161
 162 #define DEVICE_NAME "scsitape"
 163 #define DEVICE_INTR do_st
 164 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 165
 166 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 167
 168 #define DEVICE_NAME "CD-ROM"
 169 #define DEVICE_NR(device) (MINOR(device))
 170
 171 #elif (MAJOR_NR == XT_DISK_MAJOR)
 172
 173 #define DEVICE_NAME "xt disk"
 174 #define DEVICE_REQUEST do_xd_request
 175 #define DEVICE_NR(device) (MINOR(device) >> 6)
 176
 177 #elif (MAJOR_NR == PS2ESDI_MAJOR)
 178
 179 #define DEVICE_NAME "PS/2 ESDI"
 180 #define DEVICE_REQUEST do_ps2esdi_request
 181 #define DEVICE_NR(device) (MINOR(device) >> 6)
 182
 183 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 184
 185 #define DEVICE_NAME "CDU31A"
 186 #define DEVICE_REQUEST do_cdu31a_request
 187 #define DEVICE_NR(device) (MINOR(device))
 188
 189 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
 190
 191 #define DEVICE_NAME "ACSI"
 192 #define DEVICE_INTR do_acsi
 193 #define DEVICE_REQUEST do_acsi_request
 194 #define DEVICE_NR(device) (MINOR(device) >> 4)
 195
 196 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 197
 198 #define DEVICE_NAME "Mitsumi CD-ROM"
 199 /* #define DEVICE_INTR do_mcd */
 200 #define DEVICE_REQUEST do_mcd_request
 201 #define DEVICE_NR(device) (MINOR(device))
 202
 203 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
 204
 205 #define DEVICE_NAME "Mitsumi CD-ROM"
 206 /* #define DEVICE_INTR do_mcdx */
 207 #define DEVICE_REQUEST do_mcdx_request
 208 #define DEVICE_NR(device) (MINOR(device))
 209
 210 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 211
 212 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
 213 #define DEVICE_REQUEST do_sbpcd_request
 214 #define DEVICE_NR(device) (MINOR(device))
 215
 216 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 217
 218 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
 219 #define DEVICE_REQUEST do_sbpcd2_request
 220 #define DEVICE_NR(device) (MINOR(device))
 221
 222 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 223
 224 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
 225 #define DEVICE_REQUEST do_sbpcd3_request
 226 #define DEVICE_NR(device) (MINOR(device))
 227
 228 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 229
 230 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
 231 #define DEVICE_REQUEST do_sbpcd4_request
 232 #define DEVICE_NR(device) (MINOR(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
 240 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 241
 242 #define DEVICE_NAME "SONY-CDU535"
 243 #define DEVICE_INTR do_cdu535
 244 #define DEVICE_REQUEST do_cdu535_request
 245 #define DEVICE_NR(device) (MINOR(device))
 246
 247 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
 248
 249 #define DEVICE_NAME "Goldstar R420"
 250 #define DEVICE_REQUEST do_gscd_request
 251 #define DEVICE_NR(device) (MINOR(device))
 252
 253 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
 254 #define DEVICE_NAME "Philips/LMS CD-ROM cm206"
 255 #define DEVICE_REQUEST do_cm206_request
 256 #define DEVICE_NR(device) (MINOR(device))
 257
 258 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
 259
 260 #define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
 261 #define DEVICE_REQUEST do_optcd_request
 262 #define DEVICE_NR(device) (MINOR(device))
 263
 264 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
 265
 266 #define DEVICE_NAME "Sanyo H94A CD-ROM"
 267 #define DEVICE_REQUEST do_sjcd_request
 268 #define DEVICE_NR(device) (MINOR(device))
 269
 270 #elif (MAJOR_NR == APBLOCK_MAJOR)
 271
 272 #define DEVICE_NAME "apblock"
 273 #define DEVICE_REQUEST ap_request
 274 #define DEVICE_NR(device) (MINOR(device))
 275
 276 #elif (MAJOR_NR == DDV_MAJOR)
 277
 278 #define DEVICE_NAME "ddv"
 279 #define DEVICE_REQUEST ddv_request
 280 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
 281
 282 #elif (MAJOR_NR == MFM_ACORN_MAJOR)
 283
 284 #define DEVICE_NAME "mfm disk"
 285 #define DEVICE_INTR do_mfm
 286 #define DEVICE_REQUEST do_mfm_request
 287 #define DEVICE_NR(device) (MINOR(device) >> 6)
 288
 289 #elif (MAJOR_NR == NBD_MAJOR)
 290
 291 #define DEVICE_NAME "nbd"
 292 #define DEVICE_REQUEST do_nbd_request
 293 #define DEVICE_NR(device) (MINOR(device))
 294
 295 #elif (MAJOR_NR == MDISK_MAJOR)
 296
 297 #define DEVICE_NAME "mdisk"
 298 #define DEVICE_REQUEST mdisk_request
 299 #define DEVICE_NR(device) (MINOR(device))
 300
 301 #elif (MAJOR_NR == DASD_MAJOR)
 302
 303 #define DEVICE_NAME "dasd"
 304 #define DEVICE_REQUEST do_dasd_request
 305 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
 306
 307 #elif (MAJOR_NR == I2O_MAJOR)
 308
 309 #define DEVICE_NAME "I2O block"
 310 #define DEVICE_REQUEST i2ob_request
 311 #define DEVICE_NR(device) (MINOR(device)>>4)
 312
 313 #elif (MAJOR_NR == COMPAQ_SMART2_MAJOR)
 314
 315 #define DEVICE_NAME "ida"
 316 #define TIMEOUT_VALUE (25*HZ)
 317 #define DEVICE_REQUEST do_ida_request0
 318 #define DEVICE_NR(device) (MINOR(device) >> 4)
 319
 320 #endif /* MAJOR_NR == whatever */
 321
 322 /* provide DEVICE_xxx defaults, if not explicitly defined
 323  * above in the MAJOR_NR==xxx if-elif tree */
 324 #ifndef DEVICE_ON
 325 #define DEVICE_ON(device) do {} while (0)
 326 #endif
 327 #ifndef DEVICE_OFF
 328 #define DEVICE_OFF(device) do {} while (0)
 329 #endif
 330
 331 #if (MAJOR_NR != SCSI_TAPE_MAJOR)
 332 #if !defined(IDE_DRIVER)
 333
 334 #ifndef CURRENT
 335 #define CURRENT blkdev_entry_next_request(&blk_dev[MAJOR_NR].request_queue.queue_head)
 336 #endif
 337 #ifndef QUEUE_EMPTY
 338 #define QUEUE_EMPTY list_empty(&blk_dev[MAJOR_NR].request_queue.queue_head)
 339 #endif
 340
 341 #ifndef DEVICE_NAME
 342 #define DEVICE_NAME "unknown"
 343 #endif
 344
 345 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
 346
 347 #ifdef DEVICE_INTR
 348 static void (*DEVICE_INTR)(void) = NULL;
 349 #endif
 350
 351 #define SET_INTR(x) (DEVICE_INTR = (x))
 352
 353 #ifdef DEVICE_REQUEST
 354 static void (DEVICE_REQUEST)(request_queue_t *);
 355 #endif
 356
 357 #ifdef DEVICE_INTR
 358 #define CLEAR_INTR SET_INTR(NULL)
 359 #else
 360 #define CLEAR_INTR
 361 #endif
 362
 363 #define INIT_REQUEST \
 364         if (QUEUE_EMPTY) {\
 365                 CLEAR_INTR; \
 366                 return; \
 367         } \
 368         if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
 369                 panic(DEVICE_NAME ": request list destroyed"); \
 370         if (CURRENT->bh) { \
 371                 if (!buffer_locked(CURRENT->bh)) \
 372                         panic(DEVICE_NAME ": block not locked"); \
 373         }
 374
 375 #endif /* !defined(IDE_DRIVER) */
 376
 377
 378 #ifndef LOCAL_END_REQUEST       /* If we have our own end_request, we do not want to include this mess */
 379
 380 #if ! SCSI_BLK_MAJOR(MAJOR_NR) && (MAJOR_NR != COMPAQ_SMART2_MAJOR)
 381
 382 static inline void end_request(int uptodate) {
 383         struct request *req = CURRENT;
 384
 385         if (end_that_request_first(req, uptodate, DEVICE_NAME))
 386                 return;
 387
 388 #ifndef DEVICE_NO_RANDOM
 389         add_blkdev_randomness(MAJOR(req->rq_dev));
 390 #endif
 391         DEVICE_OFF(req->rq_dev);
 392         blkdev_dequeue_request(req);
 393         end_that_request_last(req);
 394 }
 395
 396 #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
 397 #endif /* LOCAL_END_REQUEST */
 398
 399 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
 400 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 401
 402 #endif /* _BLK_H */