include/linux/blk.h

/* */
This source file includes following definitions.
ide_end_request
end_request
end_request
end_redirect
   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 extern int cdu31a_init(void);
  42 #endif CONFIG_CDU31A
  43 #ifdef CONFIG_MCD
  44 extern int mcd_init(void);
  45 #endif CONFIG_MCD
  46 #ifdef CONFIG_MCDX
  47 extern int mcdx_init(void);
  48 #endif CONFIG_MCDX
  49 #ifdef CONFIG_SBPCD
  50 extern int sbpcd_init(void);
  51 #endif CONFIG_SBPCD
  52 #ifdef CONFIG_AZTCD
  53 extern int aztcd_init(void);
  54 #endif CONFIG_AZTCD
  55 #ifdef CONFIG_CDU535
  56 extern int sony535_init(void);
  57 #endif CONFIG_CDU535
  58 #ifdef CONFIG_GSCD
  59 extern int gscd_init(void);
  60 #endif CONFIG_GSCD
  61 #ifdef CONFIG_CM206
  62 extern int cm206_init(void);
  63 #endif CONFIG_CM206
  64 #ifdef CONFIG_OPTCD
  65 extern int optcd_init(void);
  66 #endif CONFIG_OPTCD
  67 #ifdef CONFIG_SJCD
  68 extern int sjcd_init(void);
  69 #endif CONFIG_SJCD
  70 #ifdef CONFIG_CDI_INIT
  71 extern int cdi_init(void);
  72 #endif CONFIG_CDI_INIT
  73 #ifdef CONFIG_BLK_DEV_HD
  74 extern int hd_init(void);
  75 #endif
  76 #ifdef CONFIG_BLK_DEV_IDE
  77 extern int ide_init(void);
  78 #endif
  79 #ifdef CONFIG_BLK_DEV_XD
  80 extern int xd_init(void);
  81 #endif
  82 #ifdef CONFIG_BLK_DEV_LOOP
  83 extern int loop_init(void);
  84 #endif
  85 #ifdef CONFIG_BLK_DEV_MD
  86 extern int md_init(void);
  87 #endif CONFIG_BLK_DEV_MD
  88 
  89 extern void set_device_ro(kdev_t dev,int flag);
  90 void add_blkdev_randomness(int major);
  91 
  92 extern int floppy_init(void);
  93 extern void rd_load(void);
  94 extern int rd_init(void);
  95 extern int rd_doload;           /* 1 = load ramdisk, 0 = don't load */
  96 extern int rd_prompt;           /* 1 = prompt for ramdisk, 0 = don't prompt */
  97 extern int 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 void floppy_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 void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup);
 369 #else
 370 
 371 #ifdef IDE_DRIVER
 372 void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) {
     /*  */
 373         struct request *req = hwgroup->rq;
 374 #elif defined(MD_DRIVER)
 375 static void end_request (int uptodate, struct request * req) {
     /*  */
 376 #else
 377 static void end_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 inline void end_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 */
/* */
root/include/linux/blk.h

INCLUDED FROM

DEFINITIONS
