include/linux/blk.h

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

INCLUDED FROM

DEFINITIONS
