root/drivers/block/blk.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. end_request
  2. 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  * 32 seems to be a reasonable number: enough to get some benefit
  14  * from the elevator-mechanism, but not so much as to lock a lot of
  15  * buffers when they are in the queue. 64 seems to be too many (easily
  16  * long pauses in reading when heavy writing/syncing is going on)
  17  */
  18 #define NR_REQUEST      64
  19 
  20 /*
  21  * This is used in the elevator algorithm: Note that
  22  * reads always go before writes. This is natural: reads
  23  * are much more time-critical than writes.
  24  */
  25 #define IN_ORDER(s1,s2) \
  26 ((s1)->cmd < (s2)->cmd || ((s1)->cmd == (s2)->cmd && \
  27 ((s1)->dev < (s2)->dev || (((s1)->dev == (s2)->dev && \
  28 (s1)->sector < (s2)->sector)))))
  29 
  30 /*
  31  * These will have to be changed to be aware of different buffer
  32  * sizes etc.. It actually needs a major cleanup.
  33  */
  34 #ifdef IDE_DRIVER
  35 #define SECTOR_MASK ((BLOCK_SIZE >> 9) - 1)
  36 #else
  37 #define SECTOR_MASK (blksize_size[MAJOR_NR] &&     \
  38         blksize_size[MAJOR_NR][MINOR(CURRENT->dev)] ? \
  39         ((blksize_size[MAJOR_NR][MINOR(CURRENT->dev)] >> 9) - 1) :  \
  40         ((BLOCK_SIZE >> 9)  -  1))
  41 #endif /* IDE_DRIVER */
  42 
  43 #define SUBSECTOR(block) (CURRENT->current_nr_sectors > 0)
  44 
  45 extern unsigned long cdu31a_init(unsigned long mem_start, unsigned long mem_end);
  46 extern unsigned long mcd_init(unsigned long mem_start, unsigned long mem_end);
  47 #ifdef CONFIG_AZTCD
  48 extern unsigned long aztcd_init(unsigned long mem_start, unsigned long mem_end);
  49 #endif
  50 #ifdef CONFIG_CDU535
  51 extern unsigned long sony535_init(unsigned long mem_start, unsigned long mem_end);
  52 #endif
  53 #ifdef CONFIG_BLK_DEV_HD
  54 extern unsigned long hd_init(unsigned long mem_start, unsigned long mem_end);
  55 #endif
  56 #ifdef CONFIG_BLK_DEV_IDE
  57 extern unsigned long ide_init(unsigned long mem_start, unsigned long mem_end);
  58 #endif
  59 #ifdef CONFIG_SBPCD
  60 extern unsigned long sbpcd_init(unsigned long, unsigned long);
  61 #endif CONFIG_SBPCD
  62 extern void set_device_ro(int dev,int flag);
  63 
  64 extern void floppy_init(void);
  65 #ifdef FD_MODULE
  66 static
  67 #else
  68 extern
  69 #endif
  70 int new_floppy_init(void);
  71 extern void rd_load(void);
  72 extern long rd_init(long mem_start, int length);
  73 extern int ramdisk_size;
  74 
  75 extern unsigned long xd_init(unsigned long mem_start, unsigned long mem_end);
  76 
  77 #define RO_IOCTLS(dev,where) \
  78   case BLKROSET: if (!suser()) return -EACCES; \
  79                  set_device_ro((dev),get_fs_long((long *) (where))); return 0; \
  80   case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \
  81                    if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; }
  82                  
  83 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
  84 
  85 /*
  86  * Add entries as needed.
  87  */
  88 
  89 #ifdef IDE_DRIVER
  90 
  91 #define DEVICE_NR(device)       (MINOR(device) >> PARTN_BITS)
  92 #define DEVICE_ON(device)       /* nothing */
  93 #define DEVICE_OFF(device)      /* nothing */
  94 
  95 #elif (MAJOR_NR == MEM_MAJOR)
  96 
  97 /* ram disk */
  98 #define DEVICE_NAME "ramdisk"
  99 #define DEVICE_REQUEST do_rd_request
 100 #define DEVICE_NR(device) ((device) & 7)
 101 #define DEVICE_ON(device) 
 102 #define DEVICE_OFF(device)
 103 
 104 #elif (MAJOR_NR == FLOPPY_MAJOR)
 105 
 106 static void floppy_off(unsigned int nr);
 107 
 108 #define DEVICE_NAME "floppy"
 109 #define DEVICE_INTR do_floppy
 110 #define DEVICE_REQUEST do_fd_request
 111 #define DEVICE_NR(device) ( ((device) & 3) | (((device) & 0x80 ) >> 5 ))
 112 #define DEVICE_ON(device)
 113 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 114 
 115 #elif (MAJOR_NR == HD_MAJOR)
 116 
 117 /* harddisk: timeout is 6 seconds.. */
 118 #define DEVICE_NAME "harddisk"
 119 #define DEVICE_INTR do_hd
 120 #define DEVICE_TIMEOUT HD_TIMER
 121 #define TIMEOUT_VALUE 600
 122 #define DEVICE_REQUEST do_hd_request
 123 #define DEVICE_NR(device) (MINOR(device)>>6)
 124 #define DEVICE_ON(device)
 125 #define DEVICE_OFF(device)
 126 
 127 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 128 
 129 #define DEVICE_NAME "scsidisk"
 130 #define DEVICE_INTR do_sd  
 131 #define TIMEOUT_VALUE 200
 132 #define DEVICE_REQUEST do_sd_request
 133 #define DEVICE_NR(device) (MINOR(device) >> 4)
 134 #define DEVICE_ON(device)
 135 #define DEVICE_OFF(device)
 136 
 137 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 138 
 139 #define DEVICE_NAME "scsitape"
 140 #define DEVICE_INTR do_st  
 141 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 142 #define DEVICE_ON(device)
 143 #define DEVICE_OFF(device)
 144 
 145 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 146 
 147 #define DEVICE_NAME "CD-ROM"
 148 #define DEVICE_INTR do_sr
 149 #define DEVICE_REQUEST do_sr_request
 150 #define DEVICE_NR(device) (MINOR(device))
 151 #define DEVICE_ON(device)
 152 #define DEVICE_OFF(device)
 153 
 154 #elif (MAJOR_NR == XT_DISK_MAJOR)
 155 
 156 #define DEVICE_NAME "xt disk"
 157 #define DEVICE_REQUEST do_xd_request
 158 #define DEVICE_NR(device) (MINOR(device) >> 6)
 159 #define DEVICE_ON(device)
 160 #define DEVICE_OFF(device)
 161 
 162 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 163 
 164 #define DEVICE_NAME "CDU31A"
 165 #define DEVICE_REQUEST do_cdu31a_request
 166 #define DEVICE_NR(device) (MINOR(device))
 167 #define DEVICE_ON(device)
 168 #define DEVICE_OFF(device)
 169 
 170 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 171 
 172 #define DEVICE_NAME "Mitsumi CD-ROM"
 173 /* #define DEVICE_INTR do_mcd */
 174 #define DEVICE_REQUEST do_mcd_request
 175 #define DEVICE_NR(device) (MINOR(device))
 176 #define DEVICE_ON(device)
 177 #define DEVICE_OFF(device)
 178 
 179 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 180 
 181 #define DEVICE_NAME "Aztech CD-ROM"
 182 #define DEVICE_REQUEST do_aztcd_request
 183 #define DEVICE_NR(device) (MINOR(device))
 184 #define DEVICE_ON(device)
 185 #define DEVICE_OFF(device)
 186 
 187 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
 188 
 189 #define DEVICE_NAME "SONY-CDU535"
 190 #define DEVICE_INTR do_cdu535
 191 #define DEVICE_REQUEST do_cdu535_request
 192 #define DEVICE_NR(device) (MINOR(device))
 193 #define DEVICE_ON(device)
 194 #define DEVICE_OFF(device)
 195 
 196 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 197 
 198 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
 199 #define DEVICE_REQUEST do_sbpcd_request
 200 #define DEVICE_NR(device) (MINOR(device))
 201 #define DEVICE_ON(device)
 202 #define DEVICE_OFF(device)
 203 
 204 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 205 
 206 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
 207 #define DEVICE_REQUEST do_sbpcd2_request
 208 #define DEVICE_NR(device) (MINOR(device))
 209 #define DEVICE_ON(device)
 210 #define DEVICE_OFF(device)
 211 
 212 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 213 
 214 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
 215 #define DEVICE_REQUEST do_sbpcd3_request
 216 #define DEVICE_NR(device) (MINOR(device))
 217 #define DEVICE_ON(device)
 218 #define DEVICE_OFF(device)
 219 
 220 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 221 
 222 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
 223 #define DEVICE_REQUEST do_sbpcd4_request
 224 #define DEVICE_NR(device) (MINOR(device))
 225 #define DEVICE_ON(device)
 226 #define DEVICE_OFF(device)
 227 
 228 #endif /* MAJOR_NR == whatever */
 229 
 230 #if (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER)
 231 
 232 #ifndef CURRENT
 233 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 234 #endif
 235 
 236 #define CURRENT_DEV DEVICE_NR(CURRENT->dev)
 237 
 238 #ifdef DEVICE_INTR
 239 void (*DEVICE_INTR)(void) = NULL;
 240 #endif
 241 #ifdef DEVICE_TIMEOUT
 242 
 243 #define SET_TIMER \
 244 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 245 (timer_active |= 1<<DEVICE_TIMEOUT))
 246 
 247 #define CLEAR_TIMER \
 248 timer_active &= ~(1<<DEVICE_TIMEOUT)
 249 
 250 #define SET_INTR(x) \
 251 if ((DEVICE_INTR = (x)) != NULL) \
 252         SET_TIMER; \
 253 else \
 254         CLEAR_TIMER;
 255 
 256 #else
 257 
 258 #define SET_INTR(x) (DEVICE_INTR = (x))
 259 
 260 #endif /* DEVICE_TIMEOUT */
 261 
 262 static void (DEVICE_REQUEST)(void);
 263 
 264 #ifdef DEVICE_INTR
 265 #define CLEAR_INTR SET_INTR(NULL)
 266 #else
 267 #define CLEAR_INTR
 268 #endif
 269 
 270 #define INIT_REQUEST \
 271         if (!CURRENT) {\
 272                 CLEAR_INTR; \
 273                 return; \
 274         } \
 275         if (MAJOR(CURRENT->dev) != MAJOR_NR) \
 276                 panic(DEVICE_NAME ": request list destroyed"); \
 277         if (CURRENT->bh) { \
 278                 if (!CURRENT->bh->b_lock) \
 279                         panic(DEVICE_NAME ": block not locked"); \
 280         }
 281 
 282 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) */
 283 
 284 /* end_request() - SCSI devices have their own version */
 285 
 286 #if ! SCSI_MAJOR(MAJOR_NR)
 287 
 288 #ifdef IDE_DRIVER
 289 static void end_request(byte uptodate, byte hwif) {
     /* [previous][next][first][last][top][bottom][index][help] */
 290         struct request *req = ide_cur_rq[HWIF];
 291 #else
 292 static void end_request(int uptodate) {
     /* [previous][next][first][last][top][bottom][index][help] */
 293         struct request *req = CURRENT;
 294 #endif /* IDE_DRIVER */
 295         struct buffer_head * bh;
 296 
 297         req->errors = 0;
 298         if (!uptodate) {
 299                 printk("end_request: I/O error, dev %04lX, sector %lu\n",
 300                        (unsigned long)req->dev, req->sector);
 301                 req->nr_sectors--;
 302                 req->nr_sectors &= ~SECTOR_MASK;
 303                 req->sector += (BLOCK_SIZE / 512);
 304                 req->sector &= ~SECTOR_MASK;            
 305         }
 306 
 307         if ((bh = req->bh) != NULL) {
 308                 req->bh = bh->b_reqnext;
 309                 bh->b_reqnext = NULL;
 310                 bh->b_uptodate = uptodate;              
 311                 if (!uptodate) bh->b_req = 0; /* So no "Weird" errors */
 312                 unlock_buffer(bh);
 313                 if ((bh = req->bh) != NULL) {
 314                         req->current_nr_sectors = bh->b_size >> 9;
 315                         if (req->nr_sectors < req->current_nr_sectors) {
 316                                 req->nr_sectors = req->current_nr_sectors;
 317                                 printk("end_request: buffer-list destroyed\n");
 318                         }
 319                         req->buffer = bh->b_data;
 320                         return;
 321                 }
 322         }
 323 #ifdef IDE_DRIVER
 324         ide_cur_rq[HWIF] = NULL;
 325 #else
 326         DEVICE_OFF(req->dev);
 327         CURRENT = req->next;
 328 #endif /* IDE_DRIVER */
 329         if (req->sem != NULL)
 330                 up(req->sem);
 331         req->dev = -1;
 332         wake_up(&wait_for_request);
 333 }
 334 #endif /* ! SCSI_MAJOR(MAJOR_NR) */
 335 
 336 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 337 
 338 #endif /* _BLK_H */

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