4 #include <linux/blkdev.h>
5 #include <linux/locks.h>
6 #include <linux/config.h>
7 #include <linux/spinlock.h>
10 * Spinlock for protecting the request queue which
11 * is mucked around with in interrupts on potentially
14 extern spinlock_t io_request_lock;
17 * Initialization functions.
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 ez_init(void);
46 extern int bpcd_init(void);
47 extern int ps2esdi_init(void);
48 extern int jsfd_init(void);
49 extern int viodasd_init(void);
50 extern int viocd_init(void);
52 #if defined(CONFIG_ARCH_S390)
53 extern int dasd_init(void);
54 extern int xpram_init(void);
55 extern int tapeblock_init(void);
56 #endif /* CONFIG_ARCH_S390 */
58 extern void set_device_ro(kdev_t dev,int flag);
59 void add_blkdev_randomness(int major);
61 extern int floppy_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 */
66 #ifdef CONFIG_BLK_DEV_INITRD
68 #define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */
70 extern unsigned long initrd_start,initrd_end;
71 extern int initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
72 void initrd_init(void);
78 * end_request() and friends. Must be called with the request queue spinlock
79 * acquired. All functions called within end_request() _must_be_ atomic.
81 * Several drivers define their own end_request and call
82 * end_that_request_first() and end_that_request_last()
83 * for parts of the original function. This prevents
84 * code duplication in drivers.
87 static inline void blkdev_dequeue_request(struct request * req)
89 list_del(&req->queue);
92 int end_that_request_first(struct request *req, int uptodate, char *name);
93 void end_that_request_last(struct request *req);
95 #if defined(MAJOR_NR) || defined(IDE_DRIVER)
101 * Add entries as needed.
106 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
107 #define DEVICE_NAME "ide"
109 #elif (MAJOR_NR == RAMDISK_MAJOR)
112 #define DEVICE_NAME "ramdisk"
113 #define DEVICE_NR(device) (MINOR(device))
114 #define DEVICE_NO_RANDOM
116 #elif (MAJOR_NR == Z2RAM_MAJOR)
119 #define DEVICE_NAME "Z2RAM"
120 #define DEVICE_REQUEST do_z2_request
121 #define DEVICE_NR(device) (MINOR(device))
123 #elif (MAJOR_NR == FLOPPY_MAJOR)
125 static void floppy_off(unsigned int nr);
127 #define DEVICE_NAME "floppy"
128 #define DEVICE_INTR do_floppy
129 #define DEVICE_REQUEST do_fd_request
130 #define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 ))
131 #define DEVICE_OFF(device) floppy_off(DEVICE_NR(device))
133 #elif (MAJOR_NR == HD_MAJOR)
135 /* Hard disk: timeout is 6 seconds. */
136 #define DEVICE_NAME "hard disk"
137 #define DEVICE_INTR do_hd
138 #define TIMEOUT_VALUE (6*HZ)
139 #define DEVICE_REQUEST do_hd_request
140 #define DEVICE_NR(device) (MINOR(device)>>6)
142 #elif (SCSI_DISK_MAJOR(MAJOR_NR))
144 #define DEVICE_NAME "scsidisk"
145 #define TIMEOUT_VALUE (2*HZ)
146 #define DEVICE_NR(device) (((MAJOR(device) & SD_MAJOR_MASK) << (8 - 4)) + (MINOR(device) >> 4))
148 /* Kludge to use the same number for both char and block major numbers */
149 #elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
151 #define DEVICE_NAME "Multiple devices driver"
152 #define DEVICE_REQUEST do_md_request
153 #define DEVICE_NR(device) (MINOR(device))
155 #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
157 #define DEVICE_NAME "scsitape"
158 #define DEVICE_INTR do_st
159 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
161 #elif (MAJOR_NR == OSST_MAJOR)
163 #define DEVICE_NAME "onstream"
164 #define DEVICE_INTR do_osst
165 #define DEVICE_NR(device) (MINOR(device) & 0x7f)
166 #define DEVICE_ON(device)
167 #define DEVICE_OFF(device)
169 #elif (MAJOR_NR == SCSI_CDROM_MAJOR)
171 #define DEVICE_NAME "CD-ROM"
172 #define DEVICE_NR(device) (MINOR(device))
174 #elif (MAJOR_NR == XT_DISK_MAJOR)
176 #define DEVICE_NAME "xt disk"
177 #define DEVICE_REQUEST do_xd_request
178 #define DEVICE_NR(device) (MINOR(device) >> 6)
180 #elif (MAJOR_NR == PS2ESDI_MAJOR)
182 #define DEVICE_NAME "PS/2 ESDI"
183 #define DEVICE_REQUEST do_ps2esdi_request
184 #define DEVICE_NR(device) (MINOR(device) >> 6)
186 #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
188 #define DEVICE_NAME "CDU31A"
189 #define DEVICE_REQUEST do_cdu31a_request
190 #define DEVICE_NR(device) (MINOR(device))
192 #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
194 #define DEVICE_NAME "ACSI"
195 #define DEVICE_INTR do_acsi
196 #define DEVICE_REQUEST do_acsi_request
197 #define DEVICE_NR(device) (MINOR(device) >> 4)
199 #elif (MAJOR_NR == MITSUMI_CDROM_MAJOR)
201 #define DEVICE_NAME "Mitsumi CD-ROM"
202 /* #define DEVICE_INTR do_mcd */
203 #define DEVICE_REQUEST do_mcd_request
204 #define DEVICE_NR(device) (MINOR(device))
206 #elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR)
208 #define DEVICE_NAME "Mitsumi CD-ROM"
209 /* #define DEVICE_INTR do_mcdx */
210 #define DEVICE_REQUEST do_mcdx_request
211 #define DEVICE_NR(device) (MINOR(device))
213 #elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR)
215 #define DEVICE_NAME "Matsushita CD-ROM controller #1"
216 #define DEVICE_REQUEST do_sbpcd_request
217 #define DEVICE_NR(device) (MINOR(device))
219 #elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR)
221 #define DEVICE_NAME "Matsushita CD-ROM controller #2"
222 #define DEVICE_REQUEST do_sbpcd2_request
223 #define DEVICE_NR(device) (MINOR(device))
225 #elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR)
227 #define DEVICE_NAME "Matsushita CD-ROM controller #3"
228 #define DEVICE_REQUEST do_sbpcd3_request
229 #define DEVICE_NR(device) (MINOR(device))
231 #elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR)
233 #define DEVICE_NAME "Matsushita CD-ROM controller #4"
234 #define DEVICE_REQUEST do_sbpcd4_request
235 #define DEVICE_NR(device) (MINOR(device))
237 #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
239 #define DEVICE_NAME "Aztech CD-ROM"
240 #define DEVICE_REQUEST do_aztcd_request
241 #define DEVICE_NR(device) (MINOR(device))
243 #elif (MAJOR_NR == CDU535_CDROM_MAJOR)
245 #define DEVICE_NAME "SONY-CDU535"
246 #define DEVICE_INTR do_cdu535
247 #define DEVICE_REQUEST do_cdu535_request
248 #define DEVICE_NR(device) (MINOR(device))
250 #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
252 #define DEVICE_NAME "Goldstar R420"
253 #define DEVICE_REQUEST do_gscd_request
254 #define DEVICE_NR(device) (MINOR(device))
256 #elif (MAJOR_NR == CM206_CDROM_MAJOR)
257 #define DEVICE_NAME "Philips/LMS CD-ROM cm206"
258 #define DEVICE_REQUEST do_cm206_request
259 #define DEVICE_NR(device) (MINOR(device))
261 #elif (MAJOR_NR == OPTICS_CDROM_MAJOR)
263 #define DEVICE_NAME "DOLPHIN 8000AT CD-ROM"
264 #define DEVICE_REQUEST do_optcd_request
265 #define DEVICE_NR(device) (MINOR(device))
267 #elif (MAJOR_NR == SANYO_CDROM_MAJOR)
269 #define DEVICE_NAME "Sanyo H94A CD-ROM"
270 #define DEVICE_REQUEST do_sjcd_request
271 #define DEVICE_NR(device) (MINOR(device))
273 #elif (MAJOR_NR == APBLOCK_MAJOR)
275 #define DEVICE_NAME "apblock"
276 #define DEVICE_REQUEST ap_request
277 #define DEVICE_NR(device) (MINOR(device))
279 #elif (MAJOR_NR == DDV_MAJOR)
281 #define DEVICE_NAME "ddv"
282 #define DEVICE_REQUEST ddv_request
283 #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
285 #elif (MAJOR_NR == MFM_ACORN_MAJOR)
287 #define DEVICE_NAME "mfm disk"
288 #define DEVICE_INTR do_mfm
289 #define DEVICE_REQUEST do_mfm_request
290 #define DEVICE_NR(device) (MINOR(device) >> 6)
292 #elif (MAJOR_NR == NBD_MAJOR)
294 #define DEVICE_NAME "nbd"
295 #define DEVICE_REQUEST do_nbd_request
296 #define DEVICE_NR(device) (MINOR(device))
298 #elif (MAJOR_NR == MDISK_MAJOR)
300 #define DEVICE_NAME "mdisk"
301 #define DEVICE_REQUEST mdisk_request
302 #define DEVICE_NR(device) (MINOR(device))
304 #elif (MAJOR_NR == DASD_MAJOR)
306 #define DEVICE_NAME "dasd"
307 #define DEVICE_REQUEST do_dasd_request
308 #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
310 #elif (MAJOR_NR == I2O_MAJOR)
312 #define DEVICE_NAME "I2O block"
313 #define DEVICE_REQUEST i2ob_request
314 #define DEVICE_NR(device) (MINOR(device)>>4)
316 #elif (MAJOR_NR == VIODASD_MAJOR)
318 #define DEVICE_NAME "viod"
319 #define TIMEOUT_VALUE (25*HZ)
320 #define DEVICE_REQUEST do_viodasd_request
321 #define DEVICE_NR(device) (MINOR(device) >> 3)
323 #elif (MAJOR_NR == VIOCD_MAJOR)
325 #define DEVICE_NAME "viocd"
326 #define TIMEOUT_VALUE (25*HZ)
327 #define DEVICE_REQUEST do_viocd_request
328 #define DEVICE_NR(device) (MINOR(device))
329 #define DEVICE_ON(device)
330 #define DEVICE_OFF(device)
331 #elif (MAJOR_NR == COMPAQ_SMART2_MAJOR)
333 #define DEVICE_NAME "ida"
334 #define TIMEOUT_VALUE (25*HZ)
335 #define DEVICE_REQUEST do_ida_request
336 #define DEVICE_NR(device) (MINOR(device) >> 4)
338 #endif /* MAJOR_NR == whatever */
340 /* provide DEVICE_xxx defaults, if not explicitly defined
341 * above in the MAJOR_NR==xxx if-elif tree */
343 #define DEVICE_ON(device) do {} while (0)
346 #define DEVICE_OFF(device) do {} while (0)
349 #if (MAJOR_NR != SCSI_TAPE_MAJOR) && (MAJOR_NR != OSST_MAJOR)
350 #if !defined(IDE_DRIVER)
353 #define CURRENT blkdev_entry_next_request(&blk_dev[MAJOR_NR].request_queue.queue_head)
356 #define QUEUE_EMPTY list_empty(&blk_dev[MAJOR_NR].request_queue.queue_head)
360 #define DEVICE_NAME "unknown"
363 #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
366 static void (*DEVICE_INTR)(void) = NULL;
369 #define SET_INTR(x) (DEVICE_INTR = (x))
371 #ifdef DEVICE_REQUEST
372 static void (DEVICE_REQUEST)(request_queue_t *);
376 #define CLEAR_INTR SET_INTR(NULL)
381 #define INIT_REQUEST \
386 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \
387 panic(DEVICE_NAME ": request list destroyed"); \
389 if (!buffer_locked(CURRENT->bh)) \
390 panic(DEVICE_NAME ": block not locked"); \
393 #endif /* !defined(IDE_DRIVER) */
396 #ifndef LOCAL_END_REQUEST /* If we have our own end_request, we do not want to include this mess */
398 #if ! SCSI_BLK_MAJOR(MAJOR_NR) && (MAJOR_NR != COMPAQ_SMART2_MAJOR)
400 static inline void end_request(int uptodate) {
401 struct request *req = CURRENT;
403 if (end_that_request_first(req, uptodate, DEVICE_NAME))
406 #ifndef DEVICE_NO_RANDOM
407 add_blkdev_randomness(MAJOR(req->rq_dev));
409 DEVICE_OFF(req->rq_dev);
410 blkdev_dequeue_request(req);
411 end_that_request_last(req);
414 #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
415 #endif /* LOCAL_END_REQUEST */
417 #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
418 #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */