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

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