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_BLK_DEV_HD
  51 extern unsigned long hd_init(unsigned long mem_start, unsigned long mem_end);
  52 #endif
  53 #ifdef CONFIG_BLK_DEV_IDE
  54 extern unsigned long ide_init(unsigned long mem_start, unsigned long mem_end);
  55 #endif
  56 #ifdef CONFIG_SBPCD
  57 extern unsigned long sbpcd_init(unsigned long, unsigned long);
  58 #endif CONFIG_SBPCD
  59 extern void set_device_ro(int dev,int flag);
  60 
  61 extern void floppy_init(void);
  62 #ifdef FD_MODULE
  63 static
  64 #else
  65 extern
  66 #endif
  67 int new_floppy_init(void);
  68 extern void rd_load(void);
  69 extern long rd_init(long mem_start, int length);
  70 extern int ramdisk_size;
  71 
  72 extern unsigned long xd_init(unsigned long mem_start, unsigned long mem_end);
  73 
  74 #define RO_IOCTLS(dev,where) \
  75   case BLKROSET: if (!suser()) return -EACCES; \
  76                  set_device_ro((dev),get_fs_long((long *) (where))); return 0; \
  77   case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \
  78                    if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; }
  79                  
  80 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
  81 
  82 /*
  83  * Add entries as needed.
  84  */
  85 
  86 #ifdef IDE_DRIVER
  87 
  88 #define DEVICE_NR(device)       (MINOR(device) >> PARTN_BITS)
  89 #define DEVICE_ON(device)       /* nothing */
  90 #define DEVICE_OFF(device)      /* nothing */
  91 
  92 #elif (MAJOR_NR == MEM_MAJOR)
  93 
  94 /* ram disk */
  95 #define DEVICE_NAME "ramdisk"
  96 #define DEVICE_REQUEST do_rd_request
  97 #define DEVICE_NR(device) ((device) & 7)
  98 #define DEVICE_ON(device) 
  99 #define DEVICE_OFF(device)
 100 
 101 #elif (MAJOR_NR == FLOPPY_MAJOR)
 102 
 103 static void floppy_off(unsigned int nr);
 104 
 105 #define DEVICE_NAME "floppy"
 106 #define DEVICE_INTR do_floppy
 107 #define DEVICE_REQUEST do_fd_request
 108 #define DEVICE_NR(device) ( ((device) & 3) | (((device) & 0x80 ) >> 5 ))
 109 #define DEVICE_ON(device)
 110 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
 111 
 112 #elif (MAJOR_NR == HD_MAJOR)
 113 
 114 /* harddisk: timeout is 6 seconds.. */
 115 #define DEVICE_NAME "harddisk"
 116 #define DEVICE_INTR do_hd
 117 #define DEVICE_TIMEOUT HD_TIMER
 118 #define TIMEOUT_VALUE 600
 119 #define DEVICE_REQUEST do_hd_request
 120 #define DEVICE_NR(device) (MINOR(device)>>6)
 121 #define DEVICE_ON(device)
 122 #define DEVICE_OFF(device)
 123 
 124 #elif (MAJOR_NR == SCSI_DISK_MAJOR)
 125 
 126 #define DEVICE_NAME "scsidisk"
 127 #define DEVICE_INTR do_sd  
 128 #define TIMEOUT_VALUE 200
 129 #define DEVICE_REQUEST do_sd_request
 130 #define DEVICE_NR(device) (MINOR(device) >> 4)
 131 #define DEVICE_ON(device)
 132 #define DEVICE_OFF(device)
 133 
 134 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
 135 
 136 #define DEVICE_NAME "scsitape"
 137 #define DEVICE_INTR do_st  
 138 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
 139 #define DEVICE_ON(device)
 140 #define DEVICE_OFF(device)
 141 
 142 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
 143 
 144 #define DEVICE_NAME "CD-ROM"
 145 #define DEVICE_INTR do_sr
 146 #define DEVICE_REQUEST do_sr_request
 147 #define DEVICE_NR(device) (MINOR(device))
 148 #define DEVICE_ON(device)
 149 #define DEVICE_OFF(device)
 150 
 151 #elif (MAJOR_NR == XT_DISK_MAJOR)
 152 
 153 #define DEVICE_NAME "xt disk"
 154 #define DEVICE_REQUEST do_xd_request
 155 #define DEVICE_NR(device) (MINOR(device) >> 6)
 156 #define DEVICE_ON(device)
 157 #define DEVICE_OFF(device)
 158 
 159 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
 160 
 161 #define DEVICE_NAME "CDU31A"
 162 #define DEVICE_REQUEST do_cdu31a_request
 163 #define DEVICE_NR(device) (MINOR(device))
 164 #define DEVICE_ON(device)
 165 #define DEVICE_OFF(device)
 166 
 167 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
 168 
 169 #define DEVICE_NAME "Mitsumi CD-ROM"
 170 /* #define DEVICE_INTR do_mcd */
 171 #define DEVICE_REQUEST do_mcd_request
 172 #define DEVICE_NR(device) (MINOR(device))
 173 #define DEVICE_ON(device)
 174 #define DEVICE_OFF(device)
 175 
 176 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
 177 
 178 #define DEVICE_NAME "Aztech CD-ROM"
 179 #define DEVICE_REQUEST do_aztcd_request
 180 #define DEVICE_NR(device) (MINOR(device))
 181 #define DEVICE_ON(device)
 182 #define DEVICE_OFF(device)
 183 
 184 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
 185 
 186 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
 187 #define DEVICE_REQUEST do_sbpcd_request
 188 #define DEVICE_NR(device) (MINOR(device))
 189 #define DEVICE_ON(device)
 190 #define DEVICE_OFF(device)
 191 
 192 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
 193 
 194 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
 195 #define DEVICE_REQUEST do_sbpcd2_request
 196 #define DEVICE_NR(device) (MINOR(device))
 197 #define DEVICE_ON(device)
 198 #define DEVICE_OFF(device)
 199 
 200 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
 201 
 202 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
 203 #define DEVICE_REQUEST do_sbpcd3_request
 204 #define DEVICE_NR(device) (MINOR(device))
 205 #define DEVICE_ON(device)
 206 #define DEVICE_OFF(device)
 207 
 208 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
 209 
 210 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
 211 #define DEVICE_REQUEST do_sbpcd4_request
 212 #define DEVICE_NR(device) (MINOR(device))
 213 #define DEVICE_ON(device)
 214 #define DEVICE_OFF(device)
 215 
 216 #endif /* MAJOR_NR == whatever */
 217 
 218 #if (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER)
 219 
 220 #ifndef CURRENT
 221 #define CURRENT (blk_dev[MAJOR_NR].current_request)
 222 #endif
 223 
 224 #define CURRENT_DEV DEVICE_NR(CURRENT->dev)
 225 
 226 #ifdef DEVICE_INTR
 227 void (*DEVICE_INTR)(void) = NULL;
 228 #endif
 229 #ifdef DEVICE_TIMEOUT
 230 
 231 #define SET_TIMER \
 232 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
 233 (timer_active |= 1<<DEVICE_TIMEOUT))
 234 
 235 #define CLEAR_TIMER \
 236 timer_active &= ~(1<<DEVICE_TIMEOUT)
 237 
 238 #define SET_INTR(x) \
 239 if ((DEVICE_INTR = (x)) != NULL) \
 240         SET_TIMER; \
 241 else \
 242         CLEAR_TIMER;
 243 
 244 #else
 245 
 246 #define SET_INTR(x) (DEVICE_INTR = (x))
 247 
 248 #endif /* DEVICE_TIMEOUT */
 249 
 250 static void (DEVICE_REQUEST)(void);
 251 
 252 #ifdef DEVICE_INTR
 253 #define CLEAR_INTR SET_INTR(NULL)
 254 #else
 255 #define CLEAR_INTR
 256 #endif
 257 
 258 #define INIT_REQUEST \
 259         if (!CURRENT) {\
 260                 CLEAR_INTR; \
 261                 return; \
 262         } \
 263         if (MAJOR(CURRENT->dev) != MAJOR_NR) \
 264                 panic(DEVICE_NAME ": request list destroyed"); \
 265         if (CURRENT->bh) { \
 266                 if (!CURRENT->bh->b_lock) \
 267                         panic(DEVICE_NAME ": block not locked"); \
 268         }
 269 
 270 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) && !defined(IDE_DRIVER) */
 271 
 272 /* end_request() - SCSI devices have their own version */
 273 
 274 #if ! SCSI_MAJOR(MAJOR_NR)
 275 
 276 #ifdef IDE_DRIVER
 277 static void end_request(byte uptodate, byte hwif) {
     /* [previous][next][first][last][top][bottom][index][help] */
 278         struct request *req = ide_cur_rq[HWIF];
 279 #else
 280 static void end_request(int uptodate) {
     /* [previous][next][first][last][top][bottom][index][help] */
 281         struct request *req = CURRENT;
 282 #endif /* IDE_DRIVER */
 283         struct buffer_head * bh;
 284 
 285         req->errors = 0;
 286         if (!uptodate) {
 287                 printk("end_request: I/O error, dev %04lX, sector %lu\n",
 288                        (unsigned long)req->dev, req->sector);
 289                 req->nr_sectors--;
 290                 req->nr_sectors &= ~SECTOR_MASK;
 291                 req->sector += (BLOCK_SIZE / 512);
 292                 req->sector &= ~SECTOR_MASK;            
 293         }
 294 
 295         if ((bh = req->bh) != NULL) {
 296                 req->bh = bh->b_reqnext;
 297                 bh->b_reqnext = NULL;
 298                 bh->b_uptodate = uptodate;              
 299                 if (!uptodate) bh->b_req = 0; /* So no "Weird" errors */
 300                 unlock_buffer(bh);
 301                 if ((bh = req->bh) != NULL) {
 302                         req->current_nr_sectors = bh->b_size >> 9;
 303                         if (req->nr_sectors < req->current_nr_sectors) {
 304                                 req->nr_sectors = req->current_nr_sectors;
 305                                 printk("end_request: buffer-list destroyed\n");
 306                         }
 307                         req->buffer = bh->b_data;
 308                         return;
 309                 }
 310         }
 311 #ifdef IDE_DRIVER
 312         ide_cur_rq[HWIF] = NULL;
 313 #else
 314         DEVICE_OFF(req->dev);
 315         CURRENT = req->next;
 316 #endif /* IDE_DRIVER */
 317         if (req->sem != NULL)
 318                 up(req->sem);
 319         req->dev = -1;
 320         wake_up(&wait_for_request);
 321 }
 322 #endif /* ! SCSI_MAJOR(MAJOR_NR) */
 323 
 324 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
 325 
 326 #endif /* _BLK_H */

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