drivers/block/blk.h

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

INCLUDED FROM

DEFINITIONS
