Version:
~ [ 0.6-2.3.46 ] ~
Architecture:
~ [ um ] ~
** Warning: Cannot open xref database.
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 #include <linux/spinlock.h>
8
9 /*
10 * Spinlock for protecting the request queue which
11 * is mucked around with in interrupts on potentially
12 * multiple CPU's..
13 */
14 extern spinlock_t io_request_lock;
15
16 /*
17 * NR_REQUEST is the number of entries in the request-queue.
18 * NOTE that writes may use only the low 2/3 of these: reads
19 * take precedence.
20 */
21 #define NR_REQUEST 128
22
23 /*
24 * This is used in the elevator algorithm. We don't prioritise reads
25 * over writes any more --- although reads are more time-critical than
26 * writes, by treating them equally we increase filesystem throughput.
27 * This turns out to give better overall performance. -- sct
28 */
29 #define IN_ORDER(s1,s2) \
30 ((s1)->rq_dev < (s2)->rq_dev || (((s1)->rq_dev == (s2)->rq_dev && \
31 (s1)->sector < (s2)->sector)))
32
33 /*
34 * Initialization functions.
35 */
36 extern int isp16_init(void);
37 extern int cdu31a_init(void);
38 extern int acsi_init(void);
39 extern int mcd_init(void);
40 extern int mcdx_init(void);
41 extern int sbpcd_init(void);
42 extern int aztcd_init(void);
43 extern int sony535_init(void);
44 extern int gscd_init(void);
45 extern int cm206_init(void);
46 extern int optcd_init(void);
47 extern int sjcd_init(void);
48 extern int cdi_init(void);
49 extern int hd_init(void);
50 extern int ide_init(void);
51 extern int xd_init(void);
52 extern int mfm_init(void);
53 extern int loop_init(void);
54 extern int md_init(void);
55 extern int ap_init(void);
56 extern int ddv_init(void);
57 extern int z2_init(void);
58 extern int swim3_init(void);
59 extern int swimiop_init(void);
60 extern int amiga_floppy_init(void);
61 extern int atari_floppy_init(void);
62 extern int nbd_init(void);
63 extern int ez_init(void);
64 extern int bpcd_init(void);
65 extern int ps2esdi_init(void);
66
67 extern void set_device_ro(kdev_t dev,int flag);
68 void add_blkdev_randomness(int major);
69
70 extern int floppy_init(void);
71 extern void rd_load(void);
72 extern int rd_init(void);
73 extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
74 extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
75 extern int rd_image_start; /* starting block # of image */
76
77 #ifdef CONFIG_BLK_DEV_INITRD
78
79 #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
80
81 extern unsigned long initrd_start,initrd_end;
82 extern int mount_initrd; /* zero if initrd should not be mounted */
83 extern int initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
84 void initrd_init(void);
85
86 #endif
87
88
89 /*
90 * end_request() and friends. Must be called with the request queue spinlock
91 * acquired. All functions called within end_request() _must_be_ atomic.
92 *
93 * Several drivers define their own end_request and call
94 * end_that_request_first() and end_that_request_last()
95 * for parts of the original function. This prevents
96 * code duplication in drivers.
97 */
98
99 extern inline void blkdev_dequeue_request(struct request * req)
100 {
101 if (req->q)
102 {
103 if (req->cmd == READ)
104 req->q->elevator.read_pendings--;
105 req->q->nr_segments -= req->nr_segments;
106 req->q = NULL;
107 }
108 list_del(&req->queue);
109 }
110
111 int end_that_request_first(struct request *req, int uptodate, char *name);
112 void end_that_request_last(struct request *req);
113
114 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
115
116 /*
117 * Add entries as needed.
118 */
119
120 #ifdef IDE_DRIVER
121
122 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
123 #define DEVICE_ON(device) /* nothing */
124 #define DEVICE_OFF(device) /* nothing */
125 #define DEVICE_NAME "ide"
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 == Z2RAM_MAJOR)
138
139 /* Zorro II Ram */
140 #define DEVICE_NAME "Z2RAM"
141 #define DEVICE_REQUEST do_z2_request
142 #define DEVICE_NR(device) (MINOR(device))
143 #define DEVICE_ON(device)
144 #define DEVICE_OFF(device)
145
146 #elif (MAJOR_NR == FLOPPY_MAJOR)
147
148 static void floppy_off(unsigned int nr);
149
150 #define DEVICE_NAME "floppy"
151 #define DEVICE_INTR do_floppy
152 #define DEVICE_REQUEST do_fd_request
153 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
154 #define DEVICE_ON(device)
155 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
156
157 #elif (MAJOR_NR == HD_MAJOR)
158
159 /* Hard disk: timeout is 6 seconds. */
160 #define DEVICE_NAME "hard disk"
161 #define DEVICE_INTR do_hd
162 #define DEVICE_TIMEOUT HD_TIMER
163 #define TIMEOUT_VALUE (6*HZ)
164 #define DEVICE_REQUEST do_hd_request
165 #define DEVICE_NR(device) (MINOR(device)>>6)
166 #define DEVICE_ON(device)
167 #define DEVICE_OFF(device)
168
169 #elif (SCSI_DISK_MAJOR(MAJOR_NR))
170
171 #define DEVICE_NAME "scsidisk"
172 #define TIMEOUT_VALUE (2*HZ)
173 #define DEVICE_NR(device) (((MAJOR(device) & SD_MAJOR_MASK) << (8 - 4)) + (MINOR(device) >> 4))
174 #define DEVICE_ON(device)
175 #define DEVICE_OFF(device)
176
177 /* Kludge to use the same number for both char and block major numbers */
178 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
179
180 #define DEVICE_NAME "Multiple devices driver"
181 #define DEVICE_REQUEST do_md_request
182 #define DEVICE_NR(device) (MINOR(device))
183 #define DEVICE_ON(device)
184 #define DEVICE_OFF(device)
185
186 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
187
188 #define DEVICE_NAME "scsitape"
189 #define DEVICE_INTR do_st
190 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
191 #define DEVICE_ON(device)
192 #define DEVICE_OFF(device)
193
194 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
195
196 #define DEVICE_NAME "CD-ROM"
197 #define DEVICE_NR(device) (MINOR(device))
198 #define DEVICE_ON(device)
199 #define DEVICE_OFF(device)
200
201 #elif (MAJOR_NR == XT_DISK_MAJOR)
202
203 #define DEVICE_NAME "xt disk"
204 #define DEVICE_REQUEST do_xd_request
205 #define DEVICE_NR(device) (MINOR(device) >> 6)
206 #define DEVICE_ON(device)
207 #define DEVICE_OFF(device)
208
209 #elif (MAJOR_NR == PS2ESDI_MAJOR)
210
211 #define DEVICE_NAME "PS/2 ESDI"
212 #define DEVICE_REQUEST do_ps2esdi_request
213 #define DEVICE_NR(device) (MINOR(device) >> 6)
214 #define DEVICE_ON(device)
215 #define DEVICE_OFF(device)
216
217 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
218
219 #define DEVICE_NAME "CDU31A"
220 #define DEVICE_REQUEST do_cdu31a_request
221 #define DEVICE_NR(device) (MINOR(device))
222 #define DEVICE_ON(device)
223 #define DEVICE_OFF(device)
224
225 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
226
227 #define DEVICE_NAME "ACSI"
228 #define DEVICE_INTR do_acsi
229 #define DEVICE_REQUEST do_acsi_request
230 #define DEVICE_NR(device) (MINOR(device) >> 4)
231 #define DEVICE_ON(device)
232 #define DEVICE_OFF(device)
233
234 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
235
236 #define DEVICE_NAME "Mitsumi CD-ROM"
237 /* #define DEVICE_INTR do_mcd */
238 #define DEVICE_REQUEST do_mcd_request
239 #define DEVICE_NR(device) (MINOR(device))
240 #define DEVICE_ON(device)
241 #define DEVICE_OFF(device)
242
243 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
244
245 #define DEVICE_NAME "Mitsumi CD-ROM"
246 /* #define DEVICE_INTR do_mcdx */
247 #define DEVICE_REQUEST do_mcdx_request
248 #define DEVICE_NR(device) (MINOR(device))
249 #define DEVICE_ON(device)
250 #define DEVICE_OFF(device)
251
252 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
253
254 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
255 #define DEVICE_REQUEST do_sbpcd_request
256 #define DEVICE_NR(device) (MINOR(device))
257 #define DEVICE_ON(device)
258 #define DEVICE_OFF(device)
259
260 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
261
262 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
263 #define DEVICE_REQUEST do_sbpcd2_request
264 #define DEVICE_NR(device) (MINOR(device))
265 #define DEVICE_ON(device)
266 #define DEVICE_OFF(device)
267
268 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
269
270 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
271 #define DEVICE_REQUEST do_sbpcd3_request
272 #define DEVICE_NR(device) (MINOR(device))
273 #define DEVICE_ON(device)
274 #define DEVICE_OFF(device)
275
276 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
277
278 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
279 #define DEVICE_REQUEST do_sbpcd4_request
280 #define DEVICE_NR(device) (MINOR(device))
281 #define DEVICE_ON(device)
282 #define DEVICE_OFF(device)
283
284 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
285
286 #define DEVICE_NAME "Aztech CD-ROM"
287 #define DEVICE_REQUEST do_aztcd_request
288 #define DEVICE_NR(device) (MINOR(device))
289 #define DEVICE_ON(device)
290 #define DEVICE_OFF(device)
291
292 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
293
294 #define DEVICE_NAME "SONY-CDU535"
295 #define DEVICE_INTR do_cdu535
296 #define DEVICE_REQUEST do_cdu535_request
297 #define DEVICE_NR(device) (MINOR(device))
298 #define DEVICE_ON(device)
299 #define DEVICE_OFF(device)
300
301 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
302
303 #define DEVICE_NAME "Goldstar R420"
304 #define DEVICE_REQUEST do_gscd_request
305 #define DEVICE_NR(device) (MINOR(device))
306 #define DEVICE_ON(device)
307 #define DEVICE_OFF(device)
308
309 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
310 #define DEVICE_NAME "Philips/LMS CD-ROM cm206"
311 #define DEVICE_REQUEST do_cm206_request
312 #define DEVICE_NR(device) (MINOR(device))
313 #define DEVICE_ON(device)
314 #define DEVICE_OFF(device)
315
316 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
317
318 #define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
319 #define DEVICE_REQUEST do_optcd_request
320 #define DEVICE_NR(device) (MINOR(device))
321 #define DEVICE_ON(device)
322 #define DEVICE_OFF(device)
323
324 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
325
326 #define DEVICE_NAME "Sanyo H94A CD-ROM"
327 #define DEVICE_REQUEST do_sjcd_request
328 #define DEVICE_NR(device) (MINOR(device))
329 #define DEVICE_ON(device)
330 #define DEVICE_OFF(device)
331
332 #elif (MAJOR_NR == APBLOCK_MAJOR)
333
334 #define DEVICE_NAME "apblock"
335 #define DEVICE_REQUEST ap_request
336 #define DEVICE_NR(device) (MINOR(device))
337 #define DEVICE_ON(device)
338 #define DEVICE_OFF(device)
339
340 #elif (MAJOR_NR == DDV_MAJOR)
341
342 #define DEVICE_NAME "ddv"
343 #define DEVICE_REQUEST ddv_request
344 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
345 #define DEVICE_ON(device)
346 #define DEVICE_OFF(device)
347
348 #elif (MAJOR_NR == MFM_ACORN_MAJOR)
349
350 #define DEVICE_NAME "mfm disk"
351 #define DEVICE_INTR do_mfm
352 #define DEVICE_REQUEST do_mfm_request
353 #define DEVICE_NR(device) (MINOR(device) >> 6)
354 #define DEVICE_ON(device)
355 #define DEVICE_OFF(device)
356
357 #elif (MAJOR_NR == NBD_MAJOR)
358
359 #define DEVICE_NAME "nbd"
360 #define DEVICE_REQUEST do_nbd_request
361 #define DEVICE_NR(device) (MINOR(device))
362 #define DEVICE_ON(device)
363 #define DEVICE_OFF(device)
364
365 #elif (MAJOR_NR == I2O_MAJOR)
366
367 #define DEVICE_NAME "I2O block"
368 #define DEVICE_REQUEST do_i2ob_request
369 #define DEVICE_NR(device) (MINOR(device)>>4)
370 #define DEVICE_ON(device)
371 #define DEVICE_OFF(device)
372
373 #elif (MAJOR_NR == COMPAQ_SMART2_MAJOR)
374
375 #define DEVICE_NAME "ida"
376 #define DEVICE_INTR do_ida
377 #define TIMEOUT_VALUE (25*HZ)
378 #define DEVICE_REQUEST do_ida_request0
379 #define DEVICE_NR(device) (MINOR(device) >> 4)
380 #define DEVICE_ON(device)
381 #define DEVICE_OFF(device)
382
383 #elif (MAJOR_NR == FHD_MAJOR)
384
385 #define DEVICE_NAME "Fake disk in a Linux file"
386 #define DEVICE_REQUEST do_fhd_request
387 #define DEVICE_NR(device) (MINOR(device))
388 #define DEVICE_ON(device)
389 #define DEVICE_OFF(device)
390
391 #endif /* MAJOR_NR == whatever */
392
393 #if (MAJOR_NR != SCSI_TAPE_MAJOR)
394 #if !defined(IDE_DRIVER)
395
396 #ifndef CURRENT
397 #define CURRENT blkdev_entry_next_request(&blk_dev[MAJOR_NR].request_queue.queue_head)
398 #endif
399 #ifndef QUEUE_EMPTY
400 #define QUEUE_EMPTY list_empty(&blk_dev[MAJOR_NR].request_queue.queue_head)
401 #endif
402
403 #ifndef DEVICE_NAME
404 #define DEVICE_NAME "unknown"
405 #endif
406
407 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
408
409 #ifdef DEVICE_INTR
410 static void (*DEVICE_INTR)(void) = NULL;
411 #endif
412
413 #ifdef DEVICE_TIMEOUT
414
415 #define SET_TIMER \
416 ((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \
417 (timer_active |= 1<<DEVICE_TIMEOUT))
418
419 #define CLEAR_TIMER \
420 timer_active &= ~(1<<DEVICE_TIMEOUT)
421
422 #define SET_INTR(x) \
423 if ((DEVICE_INTR = (x)) != NULL) \
424 SET_TIMER; \
425 else \
426 CLEAR_TIMER;
427
428 #else
429
430 #define SET_INTR(x) (DEVICE_INTR = (x))
431
432 #endif /* DEVICE_TIMEOUT */
433
434 #ifdef DEVICE_REQUEST
435 static void (DEVICE_REQUEST)(request_queue_t *);
436 #endif
437
438 #ifdef DEVICE_INTR
439 #define CLEAR_INTR SET_INTR(NULL)
440 #else
441 #define CLEAR_INTR
442 #endif
443
444 #define INIT_REQUEST \
445 if (QUEUE_EMPTY) {\
446 CLEAR_INTR; \
447 return; \
448 } \
449 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
450 panic(DEVICE_NAME ": request list destroyed"); \
451 if (CURRENT->bh) { \
452 if (!buffer_locked(CURRENT->bh)) \
453 panic(DEVICE_NAME ": block not locked"); \
454 }
455
456 #endif /* !defined(IDE_DRIVER) */
457
458
459 #ifndef LOCAL_END_REQUEST /* If we have our own end_request, we do not want to include this mess */
460
461 #if ! SCSI_BLK_MAJOR(MAJOR_NR) && (MAJOR_NR != COMPAQ_SMART2_MAJOR)
462
463 static void end_request(int uptodate) {
464 struct request *req = CURRENT;
465
466 if (end_that_request_first(req, uptodate, DEVICE_NAME))
467 return;
468
469 #ifndef DEVICE_NO_RANDOM
470 add_blkdev_randomness(MAJOR(req->rq_dev));
471 #endif
472 DEVICE_OFF(req->rq_dev);
473 blkdev_dequeue_request(req);
474 end_that_request_last(req);
475 }
476
477 #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
478 #endif /* LOCAL_END_REQUEST */
479
480 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
481 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
482
483 #endif /* _BLK_H */
484
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