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 * Initialization functions.
18 */
19 extern int isp16_init(void);
20 extern int cdu31a_init(void);
21 extern int acsi_init(void);
22 extern int mcd_init(void);
23 extern int mcdx_init(void);
24 extern int sbpcd_init(void);
25 extern int aztcd_init(void);
26 extern int sony535_init(void);
27 extern int gscd_init(void);
28 extern int cm206_init(void);
29 extern int optcd_init(void);
30 extern int sjcd_init(void);
31 extern int cdi_init(void);
32 extern int hd_init(void);
33 extern int ide_init(void);
34 extern int xd_init(void);
35 extern int mfm_init(void);
36 extern int loop_init(void);
37 extern int md_init(void);
38 extern int ap_init(void);
39 extern int ddv_init(void);
40 extern int z2_init(void);
41 extern int swim3_init(void);
42 extern int swimiop_init(void);
43 extern int amiga_floppy_init(void);
44 extern int atari_floppy_init(void);
45 extern int nbd_init(void);
46 extern int ez_init(void);
47 extern int bpcd_init(void);
48 extern int ps2esdi_init(void);
49 extern int jsfd_init(void);
50
51 #if defined(CONFIG_ARCH_S390)
52 extern int mdisk_init(void);
53 extern int dasd_init(void);
54 #endif /* CONFIG_ARCH_S390 */
55
56 extern void set_device_ro(kdev_t dev,int flag);
57 void add_blkdev_randomness(int major);
58
59 extern int floppy_init(void);
60 extern void rd_load(void);
61 extern int rd_init(void);
62 extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
63 extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
64 extern int rd_image_start; /* starting block # of image */
65
66 #ifdef CONFIG_BLK_DEV_INITRD
67
68 #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
69
70 extern unsigned long initrd_start,initrd_end;
71 extern int mount_initrd; /* zero if initrd should not be mounted */
72 extern int initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
73 void initrd_init(void);
74
75 #endif
76
77
78 /*
79 * end_request() and friends. Must be called with the request queue spinlock
80 * acquired. All functions called within end_request() _must_be_ atomic.
81 *
82 * Several drivers define their own end_request and call
83 * end_that_request_first() and end_that_request_last()
84 * for parts of the original function. This prevents
85 * code duplication in drivers.
86 */
87
88 static inline void blkdev_dequeue_request(struct request * req)
89 {
90 if (req->e) {
91 req->e->dequeue_fn(req);
92 req->e = NULL;
93 }
94 list_del(&req->queue);
95 }
96
97 int end_that_request_first(struct request *req, int uptodate, char *name);
98 void end_that_request_last(struct request *req);
99
100 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
101
102 #undef DEVICE_ON
103 #undef DEVICE_OFF
104
105 /*
106 * Add entries as needed.
107 */
108
109 #ifdef IDE_DRIVER
110
111 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
112 #define DEVICE_NAME "ide"
113
114 #elif (MAJOR_NR == RAMDISK_MAJOR)
115
116 /* ram disk */
117 #define DEVICE_NAME "ramdisk"
118 #define DEVICE_NR(device) (MINOR(device))
119 #define DEVICE_NO_RANDOM
120
121 #elif (MAJOR_NR == Z2RAM_MAJOR)
122
123 /* Zorro II Ram */
124 #define DEVICE_NAME "Z2RAM"
125 #define DEVICE_REQUEST do_z2_request
126 #define DEVICE_NR(device) (MINOR(device))
127
128 #elif (MAJOR_NR == FLOPPY_MAJOR)
129
130 static void floppy_off(unsigned int nr);
131
132 #define DEVICE_NAME "floppy"
133 #define DEVICE_INTR do_floppy
134 #define DEVICE_REQUEST do_fd_request
135 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
136 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
137
138 #elif (MAJOR_NR == HD_MAJOR)
139
140 /* Hard disk: timeout is 6 seconds. */
141 #define DEVICE_NAME "hard disk"
142 #define DEVICE_INTR do_hd
143 #define TIMEOUT_VALUE (6*HZ)
144 #define DEVICE_REQUEST do_hd_request
145 #define DEVICE_NR(device) (MINOR(device)>>6)
146
147 #elif (SCSI_DISK_MAJOR(MAJOR_NR))
148
149 #define DEVICE_NAME "scsidisk"
150 #define TIMEOUT_VALUE (2*HZ)
151 #define DEVICE_NR(device) (((MAJOR(device) & SD_MAJOR_MASK) << (8 - 4)) + (MINOR(device) >> 4))
152
153 /* Kludge to use the same number for both char and block major numbers */
154 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
155
156 #define DEVICE_NAME "Multiple devices driver"
157 #define DEVICE_REQUEST do_md_request
158 #define DEVICE_NR(device) (MINOR(device))
159
160 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
161
162 #define DEVICE_NAME "scsitape"
163 #define DEVICE_INTR do_st
164 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
165
166 #elif (MAJOR_NR == OSST_MAJOR)
167
168 #define DEVICE_NAME "onstream"
169 #define DEVICE_INTR do_osst
170 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
171 #define DEVICE_ON(device)
172 #define DEVICE_OFF(device)
173
174 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
175
176 #define DEVICE_NAME "CD-ROM"
177 #define DEVICE_NR(device) (MINOR(device))
178
179 #elif (MAJOR_NR == XT_DISK_MAJOR)
180
181 #define DEVICE_NAME "xt disk"
182 #define DEVICE_REQUEST do_xd_request
183 #define DEVICE_NR(device) (MINOR(device) >> 6)
184
185 #elif (MAJOR_NR == PS2ESDI_MAJOR)
186
187 #define DEVICE_NAME "PS/2 ESDI"
188 #define DEVICE_REQUEST do_ps2esdi_request
189 #define DEVICE_NR(device) (MINOR(device) >> 6)
190
191 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
192
193 #define DEVICE_NAME "CDU31A"
194 #define DEVICE_REQUEST do_cdu31a_request
195 #define DEVICE_NR(device) (MINOR(device))
196
197 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
198
199 #define DEVICE_NAME "ACSI"
200 #define DEVICE_INTR do_acsi
201 #define DEVICE_REQUEST do_acsi_request
202 #define DEVICE_NR(device) (MINOR(device) >> 4)
203
204 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
205
206 #define DEVICE_NAME "Mitsumi CD-ROM"
207 /* #define DEVICE_INTR do_mcd */
208 #define DEVICE_REQUEST do_mcd_request
209 #define DEVICE_NR(device) (MINOR(device))
210
211 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
212
213 #define DEVICE_NAME "Mitsumi CD-ROM"
214 /* #define DEVICE_INTR do_mcdx */
215 #define DEVICE_REQUEST do_mcdx_request
216 #define DEVICE_NR(device) (MINOR(device))
217
218 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
219
220 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
221 #define DEVICE_REQUEST do_sbpcd_request
222 #define DEVICE_NR(device) (MINOR(device))
223
224 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
225
226 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
227 #define DEVICE_REQUEST do_sbpcd2_request
228 #define DEVICE_NR(device) (MINOR(device))
229
230 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
231
232 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
233 #define DEVICE_REQUEST do_sbpcd3_request
234 #define DEVICE_NR(device) (MINOR(device))
235
236 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
237
238 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
239 #define DEVICE_REQUEST do_sbpcd4_request
240 #define DEVICE_NR(device) (MINOR(device))
241
242 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
243
244 #define DEVICE_NAME "Aztech CD-ROM"
245 #define DEVICE_REQUEST do_aztcd_request
246 #define DEVICE_NR(device) (MINOR(device))
247
248 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
249
250 #define DEVICE_NAME "SONY-CDU535"
251 #define DEVICE_INTR do_cdu535
252 #define DEVICE_REQUEST do_cdu535_request
253 #define DEVICE_NR(device) (MINOR(device))
254
255 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
256
257 #define DEVICE_NAME "Goldstar R420"
258 #define DEVICE_REQUEST do_gscd_request
259 #define DEVICE_NR(device) (MINOR(device))
260
261 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
262 #define DEVICE_NAME "Philips/LMS CD-ROM cm206"
263 #define DEVICE_REQUEST do_cm206_request
264 #define DEVICE_NR(device) (MINOR(device))
265
266 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
267
268 #define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
269 #define DEVICE_REQUEST do_optcd_request
270 #define DEVICE_NR(device) (MINOR(device))
271
272 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
273
274 #define DEVICE_NAME "Sanyo H94A CD-ROM"
275 #define DEVICE_REQUEST do_sjcd_request
276 #define DEVICE_NR(device) (MINOR(device))
277
278 #elif (MAJOR_NR == APBLOCK_MAJOR)
279
280 #define DEVICE_NAME "apblock"
281 #define DEVICE_REQUEST ap_request
282 #define DEVICE_NR(device) (MINOR(device))
283
284 #elif (MAJOR_NR == DDV_MAJOR)
285
286 #define DEVICE_NAME "ddv"
287 #define DEVICE_REQUEST ddv_request
288 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
289
290 #elif (MAJOR_NR == MFM_ACORN_MAJOR)
291
292 #define DEVICE_NAME "mfm disk"
293 #define DEVICE_INTR do_mfm
294 #define DEVICE_REQUEST do_mfm_request
295 #define DEVICE_NR(device) (MINOR(device) >> 6)
296
297 #elif (MAJOR_NR == NBD_MAJOR)
298
299 #define DEVICE_NAME "nbd"
300 #define DEVICE_REQUEST do_nbd_request
301 #define DEVICE_NR(device) (MINOR(device))
302
303 #elif (MAJOR_NR == MDISK_MAJOR)
304
305 #define DEVICE_NAME "mdisk"
306 #define DEVICE_REQUEST mdisk_request
307 #define DEVICE_NR(device) (MINOR(device))
308
309 #elif (MAJOR_NR == DASD_MAJOR)
310
311 #define DEVICE_NAME "dasd"
312 #define DEVICE_REQUEST do_dasd_request
313 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
314
315 #elif (MAJOR_NR == I2O_MAJOR)
316
317 #define DEVICE_NAME "I2O block"
318 #define DEVICE_REQUEST i2ob_request
319 #define DEVICE_NR(device) (MINOR(device)>>4)
320
321 #elif (MAJOR_NR == COMPAQ_SMART2_MAJOR)
322
323 #define DEVICE_NAME "ida"
324 #define TIMEOUT_VALUE (25*HZ)
325 #define DEVICE_REQUEST do_ida_request0
326 #define DEVICE_NR(device) (MINOR(device) >> 4)
327
328 #endif /* MAJOR_NR == whatever */
329
330 /* provide DEVICE_xxx defaults, if not explicitly defined
331 * above in the MAJOR_NR==xxx if-elif tree */
332 #ifndef DEVICE_ON
333 #define DEVICE_ON(device) do {} while (0)
334 #endif
335 #ifndef DEVICE_OFF
336 #define DEVICE_OFF(device) do {} while (0)
337 #endif
338
339 #if (MAJOR_NR != SCSI_TAPE_MAJOR) && (MAJOR_NR != OSST_MAJOR)
340 #if !defined(IDE_DRIVER)
341
342 #ifndef CURRENT
343 #define CURRENT blkdev_entry_next_request(&blk_dev[MAJOR_NR].request_queue.queue_head)
344 #endif
345 #ifndef QUEUE_EMPTY
346 #define QUEUE_EMPTY list_empty(&blk_dev[MAJOR_NR].request_queue.queue_head)
347 #endif
348
349 #ifndef DEVICE_NAME
350 #define DEVICE_NAME "unknown"
351 #endif
352
353 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
354
355 #ifdef DEVICE_INTR
356 static void (*DEVICE_INTR)(void) = NULL;
357 #endif
358
359 #define SET_INTR(x) (DEVICE_INTR = (x))
360
361 #ifdef DEVICE_REQUEST
362 static void (DEVICE_REQUEST)(request_queue_t *);
363 #endif
364
365 #ifdef DEVICE_INTR
366 #define CLEAR_INTR SET_INTR(NULL)
367 #else
368 #define CLEAR_INTR
369 #endif
370
371 #define INIT_REQUEST \
372 if (QUEUE_EMPTY) {\
373 CLEAR_INTR; \
374 return; \
375 } \
376 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
377 panic(DEVICE_NAME ": request list destroyed"); \
378 if (CURRENT->bh) { \
379 if (!buffer_locked(CURRENT->bh)) \
380 panic(DEVICE_NAME ": block not locked"); \
381 }
382
383 #endif /* !defined(IDE_DRIVER) */
384
385
386 #ifndef LOCAL_END_REQUEST /* If we have our own end_request, we do not want to include this mess */
387
388 #if ! SCSI_BLK_MAJOR(MAJOR_NR) && (MAJOR_NR != COMPAQ_SMART2_MAJOR)
389
390 static inline void end_request(int uptodate) {
391 struct request *req = CURRENT;
392
393 if (end_that_request_first(req, uptodate, DEVICE_NAME))
394 return;
395
396 #ifndef DEVICE_NO_RANDOM
397 add_blkdev_randomness(MAJOR(req->rq_dev));
398 #endif
399 DEVICE_OFF(req->rq_dev);
400 blkdev_dequeue_request(req);
401 end_that_request_last(req);
402 }
403
404 #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
405 #endif /* LOCAL_END_REQUEST */
406
407 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
408 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
409
410 #endif /* _BLK_H */
411
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