Bug Summary

File:obj-scan-build/../linux/src/drivers/scsi/sd.c
Location:line 1597, column 10
Description:Value stored to 'devi' during its initialization is never read

Annotated Source Code

1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 *
9 * <drew@colorado.edu>
10 *
11 * Modified by Eric Youngdale ericy@cais.com to
12 * add scatter-gather, multiple outstanding request, and other
13 * enhancements.
14 *
15 * Modified by Eric Youngdale eric@aib.com to support loadable
16 * low-level scsi drivers.
17 */
18
19#include <linux/module.h>
20#ifdef MODULE
21/*
22 * This is a variable in scsi.c that is set when we are processing something
23 * after boot time. By definition, this is true when we are a loadable module
24 * ourselves.
25 */
26#define MODULE_FLAGscsi_loadable_module_flag 1
27#else
28#define MODULE_FLAGscsi_loadable_module_flag scsi_loadable_module_flag
29#endif /* MODULE */
30
31#include <linux/fs.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/mm.h>
35#include <linux/string.h>
36#include <linux/errno.h>
37#include <linux/interrupt.h>
38
39#include <asm/system.h>
40
41#define MAJOR_NR8 SCSI_DISK_MAJOR8
42#include <linux/blk.h>
43#include "scsi.h"
44#include "hosts.h"
45#include "sd.h"
46#include <scsi/scsi_ioctl.h>
47#include "constants.h"
48
49#include <linux/genhd.h>
50
51/*
52 * static const char RCSid[] = "$Header:";
53 */
54
55#define MAX_RETRIES5 5
56
57/*
58 * Time out in seconds for disks and Magneto-opticals (which are slower).
59 */
60
61#define SD_TIMEOUT(20 * 100) (20 * HZ100)
62#define SD_MOD_TIMEOUT(25 * 100) (25 * HZ100)
63
64#define CLUSTERABLE_DEVICE(SC)(SC->host->use_clustering && SC->device->
type != 0x07) (SC->host->use_clustering && \
65 SC->device->type != TYPE_MOD0x07)
66
67struct hd_struct * sd;
68
69Scsi_Disk * rscsi_disks = NULL((void *) 0);
70static int * sd_sizes;
71static int * sd_blocksizes;
72static int * sd_hardsizes; /* Hardware sector size */
73
74extern int sd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
75
76static int check_scsidisk_media_change(kdev_t);
77static int fop_revalidate_scsidisk(kdev_t);
78
79static int sd_init_onedisk(int);
80
81static void requeue_sd_request (Scsi_Cmnd * SCpnt);
82
83static int sd_init(void);
84static void sd_finish(void);
85static int sd_attach(Scsi_Device *);
86static int sd_detect(Scsi_Device *);
87static void sd_detach(Scsi_Device *);
88
89struct Scsi_Device_Template sd_template =
90{ NULL((void *) 0), "disk", "sd", NULL((void *) 0), TYPE_DISK0x00,
91 SCSI_DISK_MAJOR8, 0, 0, 0, 1,
92 sd_detect, sd_init,
93 sd_finish, sd_attach, sd_detach
94};
95
96static int sd_open(struct inode * inode, struct file * filp)
97{
98 int target;
99 target = DEVICE_NR(inode->i_rdev)(((inode->i_rdev) & ((1<<8) - 1)) >> 4);
100
101 if(target >= sd_template.dev_max || !rscsi_disks[target].device)
102 return -ENXIO6; /* No such device */
103
104 /*
105 * Make sure that only one process can do a check_change_disk at one time.
106 * This is also used to lock out further access when the partition table
107 * is being re-read.
108 */
109
110 while (rscsi_disks[target].device->busy)
111 barrier()__asm__ __volatile__("": : :"memory");
112 if(rscsi_disks[target].device->removable) {
113 check_disk_change(inode->i_rdev);
114
115 /*
116 * If the drive is empty, just let the open fail.
117 */
118 if ( !rscsi_disks[target].ready )
119 return -ENXIO6;
120
121 /*
122 * Similarly, if the device has the write protect tab set,
123 * have the open fail if the user expects to be able to write
124 * to the thing.
125 */
126 if ( (rscsi_disks[target].write_prot) && (filp->f_mode & 2) )
127 return -EROFS30;
128 }
129
130 /*
131 * See if we are requesting a non-existent partition. Do this
132 * after checking for disk change.
133 */
134 if(sd_sizes[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))] == 0)
135 return -ENXIO6;
136
137 if(rscsi_disks[target].device->removable)
138 if(!rscsi_disks[target].device->access_count)
139 sd_ioctl(inode, NULL((void *) 0), SCSI_IOCTL_DOORLOCK0x5380, 0);
140
141 rscsi_disks[target].device->access_count++;
142 if (rscsi_disks[target].device->host->hostt->usage_count)
143 (*rscsi_disks[target].device->host->hostt->usage_count)++;
144 if(sd_template.usage_count) (*sd_template.usage_count)++;
145 return 0;
146}
147
148static void sd_release(struct inode * inode, struct file * file)
149{
150 int target;
151 fsync_dev(inode->i_rdev);
152
153 target = DEVICE_NR(inode->i_rdev)(((inode->i_rdev) & ((1<<8) - 1)) >> 4);
154
155 rscsi_disks[target].device->access_count--;
156 if (rscsi_disks[target].device->host->hostt->usage_count)
157 (*rscsi_disks[target].device->host->hostt->usage_count)--;
158 if(sd_template.usage_count) (*sd_template.usage_count)--;
159
160 if(rscsi_disks[target].device->removable) {
161 if(!rscsi_disks[target].device->access_count)
162 sd_ioctl(inode, NULL((void *) 0), SCSI_IOCTL_DOORUNLOCK0x5381, 0);
163 }
164}
165
166static void sd_geninit(struct gendisk *);
167
168static struct file_operations sd_fops = {
169 NULL((void *) 0), /* lseek - default */
170 block_read, /* read - general block-dev read */
171 block_write, /* write - general block-dev write */
172 NULL((void *) 0), /* readdir - bad */
173 NULL((void *) 0), /* select */
174 sd_ioctl, /* ioctl */
175 NULL((void *) 0), /* mmap */
176 sd_open, /* open code */
177 sd_release, /* release */
178 block_fsync, /* fsync */
179 NULL((void *) 0), /* fasync */
180 check_scsidisk_media_change, /* Disk change */
181 fop_revalidate_scsidisk /* revalidate */
182};
183
184static struct gendisk sd_gendisk = {
185 MAJOR_NR8, /* Major number */
186 "sd", /* Major name */
187 4, /* Bits to shift to get real from partition */
188 1 << 4, /* Number of partitions per real */
189 0, /* maximum number of real */
190 sd_geninit, /* init function */
191 NULL((void *) 0), /* hd struct */
192 NULL((void *) 0), /* block sizes */
193 0, /* number */
194 NULL((void *) 0), /* internal */
195 NULL((void *) 0) /* next */
196};
197
198static void sd_geninit (struct gendisk *ignored)
199{
200 int i;
201
202 for (i = 0; i < sd_template.dev_max; ++i)
203 if(rscsi_disks[i].device)
204 sd[i << 4].nr_sects = rscsi_disks[i].capacity;
205#if 0
206 /* No longer needed - we keep track of this as we attach/detach */
207 sd_gendisk.nr_real = sd_template.dev_max;
208#endif
209}
210
211/*
212 * rw_intr is the interrupt routine for the device driver.
213 * It will be notified on the end of a SCSI read / write, and
214 * will take one of several actions based on success or failure.
215 */
216
217static void rw_intr (Scsi_Cmnd *SCpnt)
218{
219 int result = SCpnt->result;
220 int this_count = SCpnt->bufflen >> 9;
221 int good_sectors = (result == 0 ? this_count : 0);
222 int block_sectors = 1;
223
224#ifdef DEBUG
225 printk("sd%c : rw_intr(%d, %d)\n", 'a' + MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1)),
226 SCpnt->host->host_no, result);
227#endif
228
229 /*
230 Handle MEDIUM ERRORs that indicate partial success. Since this is a
231 relatively rare error condition, no care is taken to avoid unnecessary
232 additional work such as memcpy's that could be avoided.
233 */
234
235 if (driver_byte(result)(((result) >> 24) & 0xff) != 0 && /* An error occurred */
236 SCpnt->sense_buffer[0] == 0xF0 && /* Sense data is valid */
237 SCpnt->sense_buffer[2] == MEDIUM_ERROR0x03)
238 {
239 long error_sector = (SCpnt->sense_buffer[3] << 24) |
240 (SCpnt->sense_buffer[4] << 16) |
241 (SCpnt->sense_buffer[5] << 8) |
242 SCpnt->sense_buffer[6];
243 int sector_size =
244 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].sector_size;
245 if (SCpnt->request.bh != NULL((void *) 0))
246 block_sectors = SCpnt->request.bh->b_size >> 9;
247 if (sector_size == 1024)
248 {
249 error_sector <<= 1;
250 if (block_sectors < 2) block_sectors = 2;
251 }
252 else if (sector_size == 256)
253 error_sector >>= 1;
254 error_sector -= sd[MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1))].start_sect;
255 error_sector &= ~ (block_sectors - 1);
256 good_sectors = error_sector - SCpnt->request.sector;
257 if (good_sectors < 0 || good_sectors >= this_count)
258 good_sectors = 0;
259 }
260
261 /*
262 * Handle RECOVERED ERRORs that indicate success after recovery action
263 * by the target device.
264 */
265
266 if (SCpnt->sense_buffer[0] == 0xF0 && /* Sense data is valid */
267 SCpnt->sense_buffer[2] == RECOVERED_ERROR0x01)
268 {
269 printk("scsidisk recovered I/O error: dev %s, sector %lu, absolute sector %lu\n",
270 kdevname(SCpnt->request.rq_dev), SCpnt->request.sector,
271 SCpnt->request.sector + sd[MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1))].start_sect);
272 good_sectors = this_count;
273 result = 0;
274 }
275
276 /*
277 * First case : we assume that the command succeeded. One of two things
278 * will happen here. Either we will be finished, or there will be more
279 * sectors that we were unable to read last time.
280 */
281
282 if (good_sectors > 0) {
283
284#ifdef DEBUG
285 printk("sd%c : %d sectors remain.\n", 'a' + MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1)),
286 SCpnt->request.nr_sectors);
287 printk("use_sg is %d\n ",SCpnt->use_sg);
288#endif
289 if (SCpnt->use_sg) {
290 struct scatterlist * sgpnt;
291 int i;
292 sgpnt = (struct scatterlist *) SCpnt->buffer;
293 for(i=0; i<SCpnt->use_sg; i++) {
294#ifdef DEBUG
295 printk(":%x %x %d\n",sgpnt[i].alt_address, sgpnt[i].address,
296 sgpnt[i].length);
297#endif
298 if (sgpnt[i].alt_address) {
299 if (SCpnt->request.cmd == READ0)
300 memcpy(sgpnt[i].alt_address, sgpnt[i].address,(__builtin_constant_p(sgpnt[i].length) ? __constant_memcpy((sgpnt
[i].alt_address),(sgpnt[i].address),(sgpnt[i].length)) : __memcpy
((sgpnt[i].alt_address),(sgpnt[i].address),(sgpnt[i].length))
)
301 sgpnt[i].length)(__builtin_constant_p(sgpnt[i].length) ? __constant_memcpy((sgpnt
[i].alt_address),(sgpnt[i].address),(sgpnt[i].length)) : __memcpy
((sgpnt[i].alt_address),(sgpnt[i].address),(sgpnt[i].length))
);
302 scsi_free(sgpnt[i].address, sgpnt[i].length);
303 }
304 }
305
306 /* Free list of scatter-gather pointers */
307 scsi_free(SCpnt->buffer, SCpnt->sglist_len);
308 } else {
309 if (SCpnt->buffer != SCpnt->request.buffer) {
310#ifdef DEBUG
311 printk("nosg: %x %x %d\n",SCpnt->request.buffer, SCpnt->buffer,
312 SCpnt->bufflen);
313#endif
314 if (SCpnt->request.cmd == READ0)
315 memcpy(SCpnt->request.buffer, SCpnt->buffer,(__builtin_constant_p(SCpnt->bufflen) ? __constant_memcpy(
(SCpnt->request.buffer),(SCpnt->buffer),(SCpnt->bufflen
)) : __memcpy((SCpnt->request.buffer),(SCpnt->buffer),(
SCpnt->bufflen)))
316 SCpnt->bufflen)(__builtin_constant_p(SCpnt->bufflen) ? __constant_memcpy(
(SCpnt->request.buffer),(SCpnt->buffer),(SCpnt->bufflen
)) : __memcpy((SCpnt->request.buffer),(SCpnt->buffer),(
SCpnt->bufflen)));
317 scsi_free(SCpnt->buffer, SCpnt->bufflen);
318 }
319 }
320 /*
321 * If multiple sectors are requested in one buffer, then
322 * they will have been finished off by the first command.
323 * If not, then we have a multi-buffer command.
324 */
325 if (SCpnt->request.nr_sectors > this_count)
326 {
327 SCpnt->request.errors = 0;
328
329 if (!SCpnt->request.bh)
330 {
331#ifdef DEBUG
332 printk("sd%c : handling page request, no buffer\n",
333 'a' + MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1)));
334#endif
335 /*
336 * The SCpnt->request.nr_sectors field is always done in
337 * 512 byte sectors, even if this really isn't the case.
338 */
339 panic("sd.c: linked page request (%lx %x)",
340 SCpnt->request.sector, this_count);
341 }
342 }
343 SCpnt = end_scsi_request(SCpnt, 1, good_sectors);
344 if (result == 0)
345 {
346 requeue_sd_request(SCpnt);
347 return;
348 }
349 }
350
351 if (good_sectors == 0) {
352
353 /* Free up any indirection buffers we allocated for DMA purposes. */
354 if (SCpnt->use_sg) {
355 struct scatterlist * sgpnt;
356 int i;
357 sgpnt = (struct scatterlist *) SCpnt->buffer;
358 for(i=0; i<SCpnt->use_sg; i++) {
359#ifdef DEBUG
360 printk("err: %x %x %d\n",SCpnt->request.buffer, SCpnt->buffer,
361 SCpnt->bufflen);
362#endif
363 if (sgpnt[i].alt_address) {
364 scsi_free(sgpnt[i].address, sgpnt[i].length);
365 }
366 }
367 scsi_free(SCpnt->buffer, SCpnt->sglist_len); /* Free list of scatter-gather pointers */
368 } else {
369#ifdef DEBUG
370 printk("nosgerr: %x %x %d\n",SCpnt->request.buffer, SCpnt->buffer,
371 SCpnt->bufflen);
372#endif
373 if (SCpnt->buffer != SCpnt->request.buffer)
374 scsi_free(SCpnt->buffer, SCpnt->bufflen);
375 }
376 }
377
378 /*
379 * Now, if we were good little boys and girls, Santa left us a request
380 * sense buffer. We can extract information from this, so we
381 * can choose a block to remap, etc.
382 */
383
384 if (driver_byte(result)(((result) >> 24) & 0xff) != 0) {
385 if (suggestion(result)((((result) >> 24) & 0xff) & 0xf0) == SUGGEST_REMAP0x30) {
386#ifdef REMAP
387 /*
388 * Not yet implemented. A read will fail after being remapped,
389 * a write will call the strategy routine again.
390 */
391 if rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].remap
392 {
393 result = 0;
394 }
395 else
396#endif
397 }
398
399 if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) {
400 if ((SCpnt->sense_buffer[2] & 0xf) == UNIT_ATTENTION0x06) {
401 if(rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].device->removable) {
402 /* detected disc change. set a bit and quietly refuse
403 * further access.
404 */
405 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].device->changed = 1;
406 SCpnt = end_scsi_request(SCpnt, 0, this_count);
407 requeue_sd_request(SCpnt);
408 return;
409 }
410 else
411 {
412 /*
413 * Must have been a power glitch, or a bus reset.
414 * Could not have been a media change, so we just retry
415 * the request and see what happens.
416 */
417 requeue_sd_request(SCpnt);
418 return;
419 }
420 }
421 }
422
423
424 /* If we had an ILLEGAL REQUEST returned, then we may have
425 * performed an unsupported command. The only thing this should be
426 * would be a ten byte read where only a six byte read was supported.
427 * Also, on a system where READ CAPACITY failed, we have read past
428 * the end of the disk.
429 */
430
431 if (SCpnt->sense_buffer[2] == ILLEGAL_REQUEST0x05) {
432 if (rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].ten) {
433 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].ten = 0;
434 requeue_sd_request(SCpnt);
435 result = 0;
436 } else {
437 /* ???? */
438 }
439 }
440
441 if (SCpnt->sense_buffer[2] == MEDIUM_ERROR0x03) {
442 printk("scsi%d: MEDIUM ERROR on channel %d, id %d, lun %d, CDB: ",
443 SCpnt->host->host_no, (int) SCpnt->channel,
444 (int) SCpnt->target, (int) SCpnt->lun);
445 print_command(SCpnt->cmnd);
446 print_sense("sd", SCpnt);
447 SCpnt = end_scsi_request(SCpnt, 0, block_sectors);
448 requeue_sd_request(SCpnt);
449 return;
450 }
451 } /* driver byte != 0 */
452 if (result) {
453 printk("SCSI disk error : host %d channel %d id %d lun %d return code = %x\n",
454 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].device->host->host_no,
455 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].device->channel,
456 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].device->id,
457 rscsi_disks[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4)].device->lun, result);
458
459 if (driver_byte(result)(((result) >> 24) & 0xff) & DRIVER_SENSE0x08)
460 print_sense("sd", SCpnt);
461 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.current_nr_sectors);
462 requeue_sd_request(SCpnt);
463 return;
464 }
465}
466
467/*
468 * requeue_sd_request() is the request handler function for the sd driver.
469 * Its function in life is to take block device requests, and translate
470 * them to SCSI commands.
471 */
472
473static void do_sd_request (void)
474{
475 Scsi_Cmnd * SCpnt = NULL((void *) 0);
476 Scsi_Device * SDev;
477 struct request * req = NULL((void *) 0);
478 unsigned long flags;
479 int flag = 0;
480
481 save_flags(flags)__asm__ __volatile__("pushf ; pop %0" : "=r" (flags): :"memory"
);
482 while (1==1){
483 cli()__asm__ __volatile__ ("cli": : :"memory");
484 if (CURRENT(blk_dev[8].current_request) != NULL((void *) 0) && CURRENT(blk_dev[8].current_request)->rq_status == RQ_INACTIVE(-1)) {
485 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
486 return;
487 }
488
489 INIT_SCSI_REQUESTif (!(blk_dev[8].current_request)) { (do_sd = (((void *) 0)))
; __asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory"
); return; } if ((((blk_dev[8].current_request)->rq_dev) >>
8) != 8) panic("scsidisk" ": request list destroyed"); if ((
blk_dev[8].current_request)->bh) { if (!buffer_locked((blk_dev
[8].current_request)->bh)) panic("scsidisk" ": block not locked"
); };
490 SDev = rscsi_disks[DEVICE_NR(CURRENT->rq_dev)((((blk_dev[8].current_request)->rq_dev) & ((1<<
8) - 1)) >> 4)].device;
491
492 /*
493 * I am not sure where the best place to do this is. We need
494 * to hook in a place where we are likely to come if in user
495 * space.
496 */
497 if( SDev->was_reset )
498 {
499 /*
500 * We need to relock the door, but we might
501 * be in an interrupt handler. Only do this
502 * from user space, since we do not want to
503 * sleep from an interrupt.
504 */
505 if( SDev->removable && !intr_count )
506 {
507 scsi_ioctl(SDev, SCSI_IOCTL_DOORLOCK0x5380, 0);
508 /* scsi_ioctl may allow CURRENT to change, so start over. */
509 SDev->was_reset = 0;
510 continue;
511 }
512 SDev->was_reset = 0;
513 }
514
515 /* We have to be careful here. allocate_device will get a free pointer,
516 * but there is no guarantee that it is queueable. In normal usage,
517 * we want to call this, because other types of devices may have the
518 * host all tied up, and we want to make sure that we have at least
519 * one request pending for this type of device. We can also come
520 * through here while servicing an interrupt, because of the need to
521 * start another command. If we call allocate_device more than once,
522 * then the system can wedge if the command is not queueable. The
523 * request_queueable function is safe because it checks to make sure
524 * that the host is able to take another command before it returns
525 * a pointer.
526 */
527
528 if (flag++ == 0)
529 SCpnt = allocate_device(&CURRENT(blk_dev[8].current_request),
530 rscsi_disks[DEVICE_NR(CURRENT->rq_dev)((((blk_dev[8].current_request)->rq_dev) & ((1<<
8) - 1)) >> 4)].device, 0);
531 else SCpnt = NULL((void *) 0);
532
533 /*
534 * The following restore_flags leads to latency problems. FIXME.
535 * Using a "sti()" gets rid of the latency problems but causes
536 * race conditions and crashes.
537 */
538 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
539
540 /* This is a performance enhancement. We dig down into the request
541 * list and try to find a queueable request (i.e. device not busy,
542 * and host able to accept another command. If we find one, then we
543 * queue it. This can make a big difference on systems with more than
544 * one disk drive. We want to have the interrupts off when monkeying
545 * with the request list, because otherwise the kernel might try to
546 * slip in a request in between somewhere.
547 */
548
549 if (!SCpnt && sd_template.nr_dev > 1){
550 struct request *req1;
551 req1 = NULL((void *) 0);
552 cli()__asm__ __volatile__ ("cli": : :"memory");
553 req = CURRENT(blk_dev[8].current_request);
554 while(req){
555 SCpnt = request_queueable(req,
556 rscsi_disks[DEVICE_NR(req->rq_dev)(((req->rq_dev) & ((1<<8) - 1)) >> 4)].device);
557 if(SCpnt) break;
558 req1 = req;
559 req = req->next;
560 }
561 if (SCpnt && req->rq_status == RQ_INACTIVE(-1)) {
562 if (req == CURRENT(blk_dev[8].current_request))
563 CURRENT(blk_dev[8].current_request) = CURRENT(blk_dev[8].current_request)->next;
564 else
565 req1->next = req->next;
566 }
567 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
568 }
569
570 if (!SCpnt) return; /* Could not find anything to do */
571
572 /* Queue command */
573 requeue_sd_request(SCpnt);
574 } /* While */
575}
576
577static void requeue_sd_request (Scsi_Cmnd * SCpnt)
578{
579 int dev, devm, block, this_count;
580 unsigned char cmd[10];
581 int bounce_size, contiguous;
582 int max_sg;
583 struct buffer_head * bh, *bhp;
584 char * buff, *bounce_buffer;
585
586 repeat:
587
588 if(!SCpnt || SCpnt->request.rq_status == RQ_INACTIVE(-1)) {
589 do_sd_request();
590 return;
591 }
592
593 devm = MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1));
594 dev = DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)) >>
4);
595
596 block = SCpnt->request.sector;
597 this_count = 0;
598
599#ifdef DEBUG
600 printk("Doing sd request, dev = %d, block = %d\n", devm, block);
601#endif
602
603 if (devm >= (sd_template.dev_max << 4) ||
604 !rscsi_disks[dev].device ||
605 block + SCpnt->request.nr_sectors > sd[devm].nr_sects)
606 {
607 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
608 goto repeat;
609 }
610
611 block += sd[devm].start_sect;
612
613 if (rscsi_disks[dev].device->changed)
614 {
615 /*
616 * quietly refuse to do anything to a changed disc until the changed
617 * bit has been reset
618 */
619 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
620 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
621 goto repeat;
622 }
623
624#ifdef DEBUG
625 printk("sd%c : real dev = /dev/sd%c, block = %d\n",
626 'a' + devm, dev, block);
627#endif
628
629 /*
630 * If we have a 1K hardware sectorsize, prevent access to single
631 * 512 byte sectors. In theory we could handle this - in fact
632 * the scsi cdrom driver must be able to handle this because
633 * we typically use 1K blocksizes, and cdroms typically have
634 * 2K hardware sectorsizes. Of course, things are simpler
635 * with the cdrom, since it is read-only. For performance
636 * reasons, the filesystems should be able to handle this
637 * and not force the scsi disk driver to use bounce buffers
638 * for this.
639 */
640 if (rscsi_disks[dev].sector_size == 1024)
641 if((block & 1) || (SCpnt->request.nr_sectors & 1)) {
642 printk("sd.c:Bad block number requested");
643 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
644 goto repeat;
645 }
646
647 switch (SCpnt->request.cmd)
648 {
649 case WRITE1 :
650 if (!rscsi_disks[dev].device->writeable)
651 {
652 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
653 goto repeat;
654 }
655 cmd[0] = WRITE_60x0a;
656 break;
657 case READ0 :
658 cmd[0] = READ_60x08;
659 break;
660 default :
661 panic ("Unknown sd command %d\n", SCpnt->request.cmd);
662 }
663
664 SCpnt->this_count = 0;
665
666 /* If the host adapter can deal with very large scatter-gather
667 * requests, it is a waste of time to cluster
668 */
669 contiguous = (!CLUSTERABLE_DEVICE(SCpnt)(SCpnt->host->use_clustering && SCpnt->device
->type != 0x07) ? 0 :1);
670 bounce_buffer = NULL((void *) 0);
671 bounce_size = (SCpnt->request.nr_sectors << 9);
672
673 /* First see if we need a bounce buffer for this request. If we do, make
674 * sure that we can allocate a buffer. Do not waste space by allocating
675 * a bounce buffer if we are straddling the 16Mb line
676 */
677 if (contiguous && SCpnt->request.bh &&
678 ((long) SCpnt->request.bh->b_data)
679 + (SCpnt->request.nr_sectors << 9) - 1 > ISA_DMA_THRESHOLD(0x00ffffff)
680 && SCpnt->host->unchecked_isa_dma) {
681 if(((long) SCpnt->request.bh->b_data) > ISA_DMA_THRESHOLD(0x00ffffff))
682 bounce_buffer = (char *) scsi_malloc(bounce_size);
683 if(!bounce_buffer) contiguous = 0;
684 }
685
686 if(contiguous && SCpnt->request.bh && SCpnt->request.bh->b_reqnext)
687 for(bh = SCpnt->request.bh, bhp = bh->b_reqnext; bhp; bh = bhp,
688 bhp = bhp->b_reqnext) {
689 if(!CONTIGUOUS_BUFFERS(bh,bhp)((bh->b_data+bh->b_size) == bhp->b_data)) {
690 if(bounce_buffer) scsi_free(bounce_buffer, bounce_size);
691 contiguous = 0;
692 break;
693 }
694 }
695 if (!SCpnt->request.bh || contiguous) {
696
697 /* case of page request (i.e. raw device), or unlinked buffer */
698 this_count = SCpnt->request.nr_sectors;
699 buff = SCpnt->request.buffer;
700 SCpnt->use_sg = 0;
701
702 } else if (SCpnt->host->sg_tablesize == 0 ||
703 (need_isa_buffer && dma_free_sectors <= 10)) {
704
705 /* Case of host adapter that cannot scatter-gather. We also
706 * come here if we are running low on DMA buffer memory. We set
707 * a threshold higher than that we would need for this request so
708 * we leave room for other requests. Even though we would not need
709 * it all, we need to be conservative, because if we run low enough
710 * we have no choice but to panic.
711 */
712 if (SCpnt->host->sg_tablesize != 0 &&
713 need_isa_buffer &&
714 dma_free_sectors <= 10)
715 printk("Warning: SCSI DMA buffer space running low. Using non scatter-gather I/O.\n");
716
717 this_count = SCpnt->request.current_nr_sectors;
718 buff = SCpnt->request.buffer;
719 SCpnt->use_sg = 0;
720
721 } else {
722
723 /* Scatter-gather capable host adapter */
724 struct scatterlist * sgpnt;
725 int count, this_count_max;
726 int counted;
727
728 bh = SCpnt->request.bh;
729 this_count = 0;
730 this_count_max = (rscsi_disks[dev].ten ? 0xffff : 0xff);
731 count = 0;
732 bhp = NULL((void *) 0);
733 while(bh) {
734 if ((this_count + (bh->b_size >> 9)) > this_count_max) break;
735 if(!bhp || !CONTIGUOUS_BUFFERS(bhp,bh)((bhp->b_data+bhp->b_size) == bh->b_data) ||
736 !CLUSTERABLE_DEVICE(SCpnt)(SCpnt->host->use_clustering && SCpnt->device
->type != 0x07) ||
737 (SCpnt->host->unchecked_isa_dma &&
738 ((unsigned long) bh->b_data-1) == ISA_DMA_THRESHOLD(0x00ffffff))) {
739 if (count < SCpnt->host->sg_tablesize) count++;
740 else break;
741 }
742 this_count += (bh->b_size >> 9);
743 bhp = bh;
744 bh = bh->b_reqnext;
745 }
746#if 0
747 if(SCpnt->host->unchecked_isa_dma &&
748 ((unsigned int) SCpnt->request.bh->b_data-1) == ISA_DMA_THRESHOLD(0x00ffffff)) count--;
749#endif
750 SCpnt->use_sg = count; /* Number of chains */
751 /* scsi_malloc can only allocate in chunks of 512 bytes */
752 count = (SCpnt->use_sg * sizeof(struct scatterlist) + 511) & ~511;
753
754 SCpnt->sglist_len = count;
755 max_sg = count / sizeof(struct scatterlist);
756 if(SCpnt->host->sg_tablesize < max_sg)
757 max_sg = SCpnt->host->sg_tablesize;
758 sgpnt = (struct scatterlist * ) scsi_malloc(count);
759 if (!sgpnt) {
760 printk("Warning - running *really* short on DMA buffers\n");
761 SCpnt->use_sg = 0; /* No memory left - bail out */
762 this_count = SCpnt->request.current_nr_sectors;
763 buff = SCpnt->request.buffer;
764 } else {
765 memset(sgpnt, 0, count)(__builtin_constant_p(0) ? (__builtin_constant_p((count)) ? __constant_c_and_count_memset
(((sgpnt)),((0x01010101UL*(unsigned char)(0))),((count))) : __constant_c_memset
(((sgpnt)),((0x01010101UL*(unsigned char)(0))),((count)))) : (
__builtin_constant_p((count)) ? __memset_generic((((sgpnt))),
(((0))),(((count)))) : __memset_generic(((sgpnt)),((0)),((count
))))); /* Zero so it is easy to fill, but only
766 * if memory is available
767 */
768 buff = (char *) sgpnt;
769 counted = 0;
770 for(count = 0, bh = SCpnt->request.bh, bhp = bh->b_reqnext;
771 count < SCpnt->use_sg && bh;
772 count++, bh = bhp) {
773
774 bhp = bh->b_reqnext;
775
776 if(!sgpnt[count].address) sgpnt[count].address = bh->b_data;
777 sgpnt[count].length += bh->b_size;
778 counted += bh->b_size >> 9;
779
780 if (((long) sgpnt[count].address) + sgpnt[count].length - 1 >
781 ISA_DMA_THRESHOLD(0x00ffffff) && (SCpnt->host->unchecked_isa_dma) &&
782 !sgpnt[count].alt_address) {
783 sgpnt[count].alt_address = sgpnt[count].address;
784 /* We try to avoid exhausting the DMA pool, since it is
785 * easier to control usage here. In other places we might
786 * have a more pressing need, and we would be screwed if
787 * we ran out */
788 if(dma_free_sectors < (sgpnt[count].length >> 9) + 10) {
789 sgpnt[count].address = NULL((void *) 0);
790 } else {
791 sgpnt[count].address =
792 (char *) scsi_malloc(sgpnt[count].length);
793 }
794 /* If we start running low on DMA buffers, we abort the
795 * scatter-gather operation, and free all of the memory
796 * we have allocated. We want to ensure that all scsi
797 * operations are able to do at least a non-scatter/gather
798 * operation */
799 if(sgpnt[count].address == NULL((void *) 0)){ /* Out of dma memory */
800#if 0
801 printk("Warning: Running low on SCSI DMA buffers");
802 /* Try switching back to a non s-g operation. */
803 while(--count >= 0){
804 if(sgpnt[count].alt_address)
805 scsi_free(sgpnt[count].address,
806 sgpnt[count].length);
807 }
808 this_count = SCpnt->request.current_nr_sectors;
809 buff = SCpnt->request.buffer;
810 SCpnt->use_sg = 0;
811 scsi_free(sgpnt, SCpnt->sglist_len);
812#endif
813 SCpnt->use_sg = count;
814 this_count = counted -= bh->b_size >> 9;
815 break;
816 }
817 }
818
819 /* Only cluster buffers if we know that we can supply DMA
820 * buffers large enough to satisfy the request. Do not cluster
821 * a new request if this would mean that we suddenly need to
822 * start using DMA bounce buffers */
823 if(bhp && CONTIGUOUS_BUFFERS(bh,bhp)((bh->b_data+bh->b_size) == bhp->b_data)
824 && CLUSTERABLE_DEVICE(SCpnt)(SCpnt->host->use_clustering && SCpnt->device
->type != 0x07)) {
825 char * tmp;
826
827 if (((long) sgpnt[count].address) + sgpnt[count].length +
828 bhp->b_size - 1 > ISA_DMA_THRESHOLD(0x00ffffff) &&
829 (SCpnt->host->unchecked_isa_dma) &&
830 !sgpnt[count].alt_address) continue;
831
832 if(!sgpnt[count].alt_address) {count--; continue; }
833 if(dma_free_sectors > 10)
834 tmp = (char *) scsi_malloc(sgpnt[count].length
835 + bhp->b_size);
836 else {
837 tmp = NULL((void *) 0);
838 max_sg = SCpnt->use_sg;
839 }
840 if(tmp){
841 scsi_free(sgpnt[count].address, sgpnt[count].length);
842 sgpnt[count].address = tmp;
843 count--;
844 continue;
845 }
846
847 /* If we are allowed another sg chain, then increment
848 * counter so we can insert it. Otherwise we will end
849 up truncating */
850
851 if (SCpnt->use_sg < max_sg) SCpnt->use_sg++;
852 } /* contiguous buffers */
853 } /* for loop */
854
855 /* This is actually how many we are going to transfer */
856 this_count = counted;
857
858 if(count < SCpnt->use_sg || SCpnt->use_sg
859 > SCpnt->host->sg_tablesize){
860 bh = SCpnt->request.bh;
861 printk("Use sg, count %d %x %d\n",
862 SCpnt->use_sg, count, dma_free_sectors);
863 printk("maxsg = %x, counted = %d this_count = %d\n",
864 max_sg, counted, this_count);
865 while(bh){
866 printk("[%p %lx] ", bh->b_data, bh->b_size);
867 bh = bh->b_reqnext;
868 }
869 if(SCpnt->use_sg < 16)
870 for(count=0; count<SCpnt->use_sg; count++)
871 printk("{%d:%p %p %d} ", count,
872 sgpnt[count].address,
873 sgpnt[count].alt_address,
874 sgpnt[count].length);
875 panic("Ooops");
876 }
877
878 if (SCpnt->request.cmd == WRITE1)
879 for(count=0; count<SCpnt->use_sg; count++)
880 if(sgpnt[count].alt_address)
881 memcpy(sgpnt[count].address, sgpnt[count].alt_address,(__builtin_constant_p(sgpnt[count].length) ? __constant_memcpy
((sgpnt[count].address),(sgpnt[count].alt_address),(sgpnt[count
].length)) : __memcpy((sgpnt[count].address),(sgpnt[count].alt_address
),(sgpnt[count].length)))
882 sgpnt[count].length)(__builtin_constant_p(sgpnt[count].length) ? __constant_memcpy
((sgpnt[count].address),(sgpnt[count].alt_address),(sgpnt[count
].length)) : __memcpy((sgpnt[count].address),(sgpnt[count].alt_address
),(sgpnt[count].length)));
883 } /* Able to malloc sgpnt */
884 } /* Host adapter capable of scatter-gather */
885
886 /* Now handle the possibility of DMA to addresses > 16Mb */
887
888 if(SCpnt->use_sg == 0){
889 if (((long) buff) + (this_count << 9) - 1 > ISA_DMA_THRESHOLD(0x00ffffff) &&
890 (SCpnt->host->unchecked_isa_dma)) {
891 if(bounce_buffer)
892 buff = bounce_buffer;
893 else
894 buff = (char *) scsi_malloc(this_count << 9);
895 if(buff == NULL((void *) 0)) { /* Try backing off a bit if we are low on mem*/
896 this_count = SCpnt->request.current_nr_sectors;
897 buff = (char *) scsi_malloc(this_count << 9);
898 if(!buff) panic("Ran out of DMA buffers.");
899 }
900 if (SCpnt->request.cmd == WRITE1)
901 memcpy(buff, (char *)SCpnt->request.buffer, this_count << 9)(__builtin_constant_p(this_count << 9) ? __constant_memcpy
((buff),((char *)SCpnt->request.buffer),(this_count <<
9)) : __memcpy((buff),((char *)SCpnt->request.buffer),(this_count
<< 9)));
902 }
903 }
904#ifdef DEBUG
905 printk("sd%c : %s %d/%d 512 byte blocks.\n",
906 'a' + devm,
907 (SCpnt->request.cmd == WRITE1) ? "writing" : "reading",
908 this_count, SCpnt->request.nr_sectors);
909#endif
910
911 cmd[1] = (SCpnt->lun << 5) & 0xe0;
912
913 if (rscsi_disks[dev].sector_size == 1024){
914 if(block & 1) panic("sd.c:Bad block number requested");
915 if(this_count & 1) panic("sd.c:Bad block number requested");
916 block = block >> 1;
917 this_count = this_count >> 1;
918 }
919
920 if (rscsi_disks[dev].sector_size == 256){
921 block = block << 1;
922 this_count = this_count << 1;
923 }
924
925 if (((this_count > 0xff) || (block > 0x1fffff)) && rscsi_disks[dev].ten)
926 {
927 if (this_count > 0xffff)
928 this_count = 0xffff;
929
930 cmd[0] += READ_100x28 - READ_60x08 ;
931 cmd[2] = (unsigned char) (block >> 24) & 0xff;
932 cmd[3] = (unsigned char) (block >> 16) & 0xff;
933 cmd[4] = (unsigned char) (block >> 8) & 0xff;
934 cmd[5] = (unsigned char) block & 0xff;
935 cmd[6] = cmd[9] = 0;
936 cmd[7] = (unsigned char) (this_count >> 8) & 0xff;
937 cmd[8] = (unsigned char) this_count & 0xff;
938 }
939 else
940 {
941 if (this_count > 0xff)
942 this_count = 0xff;
943
944 cmd[1] |= (unsigned char) ((block >> 16) & 0x1f);
945 cmd[2] = (unsigned char) ((block >> 8) & 0xff);
946 cmd[3] = (unsigned char) block & 0xff;
947 cmd[4] = (unsigned char) this_count;
948 cmd[5] = 0;
949 }
950
951 /*
952 * We shouldn't disconnect in the middle of a sector, so with a dumb
953 * host adapter, it's safe to assume that we can at least transfer
954 * this many bytes between each connect / disconnect.
955 */
956
957 SCpnt->transfersize = rscsi_disks[dev].sector_size;
958 SCpnt->underflow = this_count << 9;
959 scsi_do_cmd (SCpnt, (void *) cmd, buff,
960 this_count * rscsi_disks[dev].sector_size,
961 rw_intr,
962 (SCpnt->device->type == TYPE_DISK0x00 ?
963 SD_TIMEOUT(20 * 100) : SD_MOD_TIMEOUT(25 * 100)),
964 MAX_RETRIES5);
965}
966
967static int check_scsidisk_media_change(kdev_t full_dev){
968 int retval;
969 int target;
970 struct inode inode;
971 int flag = 0;
972
973 target = DEVICE_NR(full_dev)(((full_dev) & ((1<<8) - 1)) >> 4);
974
975 if (target >= sd_template.dev_max ||
976 !rscsi_disks[target].device) {
977 printk("SCSI disk request error: invalid device.\n");
978 return 0;
979 }
980
981 if(!rscsi_disks[target].device->removable) return 0;
982
983 inode.i_rdev = full_dev; /* This is all we really need here */
984
985 /* Using Start/Stop enables differentiation between drive with
986 * no cartridge loaded - NOT READY, drive with changed cartridge -
987 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
988 * This also handles drives that auto spin down. eg iomega jaz 1GB
989 * as this will spin up the drive.
990 */
991 retval = sd_ioctl(&inode, NULL((void *) 0), SCSI_IOCTL_START_UNIT5, 0);
992
993 if(retval){ /* Unable to test, unit probably not ready. This usually
994 * means there is no disc in the drive. Mark as changed,
995 * and we will figure it out later once the drive is
996 * available again. */
997
998 rscsi_disks[target].ready = 0;
999 rscsi_disks[target].device->changed = 1;
1000 return 1; /* This will force a flush, if called from
1001 * check_disk_change */
1002 }
1003
1004 /*
1005 * for removable scsi disk ( FLOPTICAL ) we have to recognise the
1006 * presence of disk in the drive. This is kept in the Scsi_Disk
1007 * struct and tested at open ! Daniel Roche ( dan@lectra.fr )
1008 */
1009
1010 rscsi_disks[target].ready = 1; /* FLOPTICAL */
1011
1012 retval = rscsi_disks[target].device->changed;
1013 if(!flag) rscsi_disks[target].device->changed = 0;
1014 return retval;
1015}
1016
1017static void sd_init_done (Scsi_Cmnd * SCpnt)
1018{
1019 struct request * req;
1020
1021 req = &SCpnt->request;
1022 req->rq_status = RQ_SCSI_DONE0xfffe; /* Busy, but indicate request done */
1023
1024 if (req->sem != NULL((void *) 0)) {
1025 up(req->sem);
1026 }
1027}
1028
1029static int sd_init_onedisk(int i)
1030{
1031 unsigned char cmd[10];
1032 unsigned char *buffer;
1033 unsigned long spintime;
1034 int the_result, retries;
1035 Scsi_Cmnd * SCpnt;
1036
1037 /* We need to retry the READ_CAPACITY because a UNIT_ATTENTION is
1038 * considered a fatal error, and many devices report such an error
1039 * just after a scsi bus reset.
1040 */
1041
1042 SCpnt = allocate_device(NULL((void *) 0), rscsi_disks[i].device, 1);
1043 buffer = (unsigned char *) scsi_malloc(512);
1044
1045 spintime = 0;
1046
1047 /* Spin up drives, as required. Only do this at boot time */
1048 /* Spinup needs to be done for module loads too. */
1049 do{
1050 retries = 0;
1051 while(retries < 3)
1052 {
1053 cmd[0] = TEST_UNIT_READY0x00;
1054 cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
1055 memset ((void *) &cmd[2], 0, 8)(__builtin_constant_p(0) ? (__builtin_constant_p((8)) ? __constant_c_and_count_memset
((((void *) &cmd[2])),((0x01010101UL*(unsigned char)(0)))
,((8))) : __constant_c_memset((((void *) &cmd[2])),((0x01010101UL
*(unsigned char)(0))),((8)))) : (__builtin_constant_p((8)) ? __memset_generic
(((((void *) &cmd[2]))),(((0))),(((8)))) : __memset_generic
((((void *) &cmd[2])),((0)),((8)))));
1056 SCpnt->cmd_len = 0;
1057 SCpnt->sense_buffer[0] = 0;
1058 SCpnt->sense_buffer[2] = 0;
1059
1060 {
1061 struct semaphore sem = MUTEX_LOCKED((struct semaphore) { 0, 0, 0, ((void *) 0) });
1062 /* Mark as really busy again */
1063 SCpnt->request.rq_status = RQ_SCSI_BUSY0xffff;
1064 SCpnt->request.sem = &sem;
1065 scsi_do_cmd (SCpnt,
1066 (void *) cmd, (void *) buffer,
1067 512, sd_init_done, SD_TIMEOUT(20 * 100),
1068 MAX_RETRIES5);
1069 down(&sem);
1070 }
1071
1072 the_result = SCpnt->result;
1073 retries++;
1074 if( the_result == 0
1075 || SCpnt->sense_buffer[2] != UNIT_ATTENTION0x06)
1076 break;
1077 }
1078
1079 /* Look for non-removable devices that return NOT_READY.
1080 * Issue command to spin up drive for these cases. */
1081 if(the_result && !rscsi_disks[i].device->removable &&
1082 SCpnt->sense_buffer[2] == NOT_READY0x02) {
1083 unsigned long time1;
1084 if(!spintime){
1085#ifdef MACH1
1086 printk( "sd%d: Spinning up disk...", i);
1087#else
1088 printk( "sd%c: Spinning up disk...", 'a' + i );
1089#endif
1090 cmd[0] = START_STOP0x1b;
1091 cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
1092 cmd[1] |= 1; /* Return immediately */
1093 memset ((void *) &cmd[2], 0, 8)(__builtin_constant_p(0) ? (__builtin_constant_p((8)) ? __constant_c_and_count_memset
((((void *) &cmd[2])),((0x01010101UL*(unsigned char)(0)))
,((8))) : __constant_c_memset((((void *) &cmd[2])),((0x01010101UL
*(unsigned char)(0))),((8)))) : (__builtin_constant_p((8)) ? __memset_generic
(((((void *) &cmd[2]))),(((0))),(((8)))) : __memset_generic
((((void *) &cmd[2])),((0)),((8)))));
1094 cmd[4] = 1; /* Start spin cycle */
1095 SCpnt->cmd_len = 0;
1096 SCpnt->sense_buffer[0] = 0;
1097 SCpnt->sense_buffer[2] = 0;
1098
1099 {
1100 struct semaphore sem = MUTEX_LOCKED((struct semaphore) { 0, 0, 0, ((void *) 0) });
1101 /* Mark as really busy again */
1102 SCpnt->request.rq_status = RQ_SCSI_BUSY0xffff;
1103 SCpnt->request.sem = &sem;
1104 scsi_do_cmd (SCpnt,
1105 (void *) cmd, (void *) buffer,
1106 512, sd_init_done, SD_TIMEOUT(20 * 100),
1107 MAX_RETRIES5);
1108 down(&sem);
1109 }
1110
1111 spintime = jiffies;
1112 }
1113
1114 time1 = jiffies + HZ100;
1115 while(jiffies < time1); /* Wait 1 second for next try */
1116 printk( "." );
1117 }
1118 } while(the_result && spintime && spintime+100*HZ100 > jiffies);
1119 if (spintime) {
1120 if (the_result)
1121 printk( "not responding...\n" );
1122 else
1123 printk( "ready\n" );
1124 }
1125
1126 retries = 3;
1127 do {
1128 cmd[0] = READ_CAPACITY0x25;
1129 cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
1130 memset ((void *) &cmd[2], 0, 8)(__builtin_constant_p(0) ? (__builtin_constant_p((8)) ? __constant_c_and_count_memset
((((void *) &cmd[2])),((0x01010101UL*(unsigned char)(0)))
,((8))) : __constant_c_memset((((void *) &cmd[2])),((0x01010101UL
*(unsigned char)(0))),((8)))) : (__builtin_constant_p((8)) ? __memset_generic
(((((void *) &cmd[2]))),(((0))),(((8)))) : __memset_generic
((((void *) &cmd[2])),((0)),((8)))));
1131 memset ((void *) buffer, 0, 8)(__builtin_constant_p(0) ? (__builtin_constant_p((8)) ? __constant_c_and_count_memset
((((void *) buffer)),((0x01010101UL*(unsigned char)(0))),((8)
)) : __constant_c_memset((((void *) buffer)),((0x01010101UL*(
unsigned char)(0))),((8)))) : (__builtin_constant_p((8)) ? __memset_generic
(((((void *) buffer))),(((0))),(((8)))) : __memset_generic(((
(void *) buffer)),((0)),((8)))));
1132 SCpnt->cmd_len = 0;
1133 SCpnt->sense_buffer[0] = 0;
1134 SCpnt->sense_buffer[2] = 0;
1135
1136 {
1137 struct semaphore sem = MUTEX_LOCKED((struct semaphore) { 0, 0, 0, ((void *) 0) });
1138 /* Mark as really busy again */
1139 SCpnt->request.rq_status = RQ_SCSI_BUSY0xffff;
1140 SCpnt->request.sem = &sem;
1141 scsi_do_cmd (SCpnt,
1142 (void *) cmd, (void *) buffer,
1143 8, sd_init_done, SD_TIMEOUT(20 * 100),
1144 MAX_RETRIES5);
1145 down(&sem); /* sleep until it is ready */
1146 }
1147
1148 the_result = SCpnt->result;
1149 retries--;
1150
1151 } while(the_result && retries);
1152
1153 SCpnt->request.rq_status = RQ_INACTIVE(-1); /* Mark as not busy */
1154
1155 wake_up(&SCpnt->device->device_wait);
1156
1157 /* Wake up a process waiting for device */
1158
1159 /*
1160 * The SCSI standard says:
1161 * "READ CAPACITY is necessary for self configuring software"
1162 * While not mandatory, support of READ CAPACITY is strongly encouraged.
1163 * We used to die if we couldn't successfully do a READ CAPACITY.
1164 * But, now we go on about our way. The side effects of this are
1165 *
1166 * 1. We can't know block size with certainty. I have said "512 bytes
1167 * is it" as this is most common.
1168 *
1169 * 2. Recovery from when some one attempts to read past the end of the
1170 * raw device will be slower.
1171 */
1172
1173 if (the_result)
1174 {
1175#ifdef MACH1
1176 printk ("sd%d : READ CAPACITY failed.\n"
1177 "sd%d : status = %x, message = %02x, host = %d, driver = %02x \n",
1178 i, i,
1179#else
1180 printk ("sd%c : READ CAPACITY failed.\n"
1181 "sd%c : status = %x, message = %02x, host = %d, driver = %02x \n",
1182 'a' + i, 'a' + i,
1183#endif
1184 status_byte(the_result)(((the_result) >> 1) & 0x1f),
1185 msg_byte(the_result)(((the_result) >> 8) & 0xff),
1186 host_byte(the_result)(((the_result) >> 16) & 0xff),
1187 driver_byte(the_result)(((the_result) >> 24) & 0xff)
1188 );
1189 if (driver_byte(the_result)(((the_result) >> 24) & 0xff) & DRIVER_SENSE0x08)
1190#ifdef MACH1
1191 printk("sd%d : extended sense code = %1x \n",
1192 i, SCpnt->sense_buffer[2] & 0xf);
1193#else
1194 printk("sd%c : extended sense code = %1x \n",
1195 'a' + i, SCpnt->sense_buffer[2] & 0xf);
1196#endif
1197 else
1198#ifdef MACH1
1199 printk("sd%d : sense not available. \n", i);
1200#else
1201 printk("sd%c : sense not available. \n", 'a' + i);
1202#endif
1203
1204#ifdef MACH1
1205 printk("sd%d : block size assumed to be 512 bytes, disk size 1GB. \n",
1206 i);
1207#else
1208 printk("sd%c : block size assumed to be 512 bytes, disk size 1GB. \n",
1209 'a' + i);
1210#endif
1211 rscsi_disks[i].capacity = 0x1fffff;
1212 rscsi_disks[i].sector_size = 512;
1213
1214 /* Set dirty bit for removable devices if not ready - sometimes drives
1215 * will not report this properly. */
1216 if(rscsi_disks[i].device->removable &&
1217 SCpnt->sense_buffer[2] == NOT_READY0x02)
1218 rscsi_disks[i].device->changed = 1;
1219
1220 }
1221 else
1222 {
1223 /*
1224 * FLOPTICAL , if read_capa is ok , drive is assumed to be ready
1225 */
1226 rscsi_disks[i].ready = 1;
1227
1228 rscsi_disks[i].capacity = 1 + ((buffer[0] << 24) |
1229 (buffer[1] << 16) |
1230 (buffer[2] << 8) |
1231 buffer[3]);
1232
1233 rscsi_disks[i].sector_size = (buffer[4] << 24) |
1234 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1235
1236 if (rscsi_disks[i].sector_size == 0) {
1237 rscsi_disks[i].sector_size = 512;
1238#ifdef MACH1
1239 printk("sd%d : sector size 0 reported, assuming 512.\n", i);
1240#else
1241 printk("sd%c : sector size 0 reported, assuming 512.\n", 'a' + i);
1242#endif
1243 }
1244
1245
1246 if (rscsi_disks[i].sector_size != 512 &&
1247 rscsi_disks[i].sector_size != 1024 &&
1248 rscsi_disks[i].sector_size != 256)
1249 {
1250#ifdef MACH1
1251 printk ("sd%d : unsupported sector size %d.\n",
1252 i, rscsi_disks[i].sector_size);
1253#else
1254 printk ("sd%c : unsupported sector size %d.\n",
1255 'a' + i, rscsi_disks[i].sector_size);
1256#endif
1257 if(rscsi_disks[i].device->removable){
1258 rscsi_disks[i].capacity = 0;
1259 } else {
1260 printk ("scsi : deleting disk entry.\n");
1261 rscsi_disks[i].device = NULL((void *) 0);
1262 sd_template.nr_dev--;
1263 sd_gendisk.nr_real--;
1264 return i;
1265 }
1266 }
1267 {
1268 /*
1269 * The msdos fs needs to know the hardware sector size
1270 * So I have created this table. See ll_rw_blk.c
1271 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1272 */
1273 int m, mb;
1274 int sz_quot, sz_rem;
1275 int hard_sector = rscsi_disks[i].sector_size;
1276 /* There are 16 minors allocated for each major device */
1277 for (m=i<<4; m<((i+1)<<4); m++){
1278 sd_hardsizes[m] = hard_sector;
1279 }
1280 mb = rscsi_disks[i].capacity / 1024 * hard_sector / 1024;
1281 /* sz = div(m/100, 10); this seems to not be in the libr */
1282 m = (mb + 50) / 100;
1283 sz_quot = m / 10;
1284 sz_rem = m - (10 * sz_quot);
1285#ifdef MACH1
1286 printk ("SCSI device sd%d: hdwr sector= %d bytes."
1287 " Sectors= %d [%d MB] [%d.%1d GB]\n",
1288 i, hard_sector, rscsi_disks[i].capacity,
1289 mb, sz_quot, sz_rem);
1290#else
1291 printk ("SCSI device sd%c: hdwr sector= %d bytes."
1292 " Sectors= %d [%d MB] [%d.%1d GB]\n",
1293 i+'a', hard_sector, rscsi_disks[i].capacity,
1294 mb, sz_quot, sz_rem);
1295#endif
1296 }
1297 if(rscsi_disks[i].sector_size == 1024)
1298 rscsi_disks[i].capacity <<= 1; /* Change into 512 byte sectors */
1299 if(rscsi_disks[i].sector_size == 256)
1300 rscsi_disks[i].capacity >>= 1; /* Change into 512 byte sectors */
1301 }
1302
1303
1304 /*
1305 * Unless otherwise specified, this is not write protected.
1306 */
1307 rscsi_disks[i].write_prot = 0;
1308 if ( rscsi_disks[i].device->removable && rscsi_disks[i].ready ) {
1309 /* FLOPTICAL */
1310
1311 /*
1312 * for removable scsi disk ( FLOPTICAL ) we have to recognise
1313 * the Write Protect Flag. This flag is kept in the Scsi_Disk struct
1314 * and tested at open !
1315 * Daniel Roche ( dan@lectra.fr )
1316 */
1317
1318 memset ((void *) &cmd[0], 0, 8)(__builtin_constant_p(0) ? (__builtin_constant_p((8)) ? __constant_c_and_count_memset
((((void *) &cmd[0])),((0x01010101UL*(unsigned char)(0)))
,((8))) : __constant_c_memset((((void *) &cmd[0])),((0x01010101UL
*(unsigned char)(0))),((8)))) : (__builtin_constant_p((8)) ? __memset_generic
(((((void *) &cmd[0]))),(((0))),(((8)))) : __memset_generic
((((void *) &cmd[0])),((0)),((8)))));
1319 cmd[0] = MODE_SENSE0x1a;
1320 cmd[1] = (rscsi_disks[i].device->lun << 5) & 0xe0;
1321 cmd[2] = 1; /* page code 1 ?? */
1322 cmd[4] = 12;
1323 SCpnt->cmd_len = 0;
1324 SCpnt->sense_buffer[0] = 0;
1325 SCpnt->sense_buffer[2] = 0;
1326
1327 /* same code as READCAPA !! */
1328 {
1329 struct semaphore sem = MUTEX_LOCKED((struct semaphore) { 0, 0, 0, ((void *) 0) });
1330 SCpnt->request.rq_status = RQ_SCSI_BUSY0xffff; /* Mark as really busy again */
1331 SCpnt->request.sem = &sem;
1332 scsi_do_cmd (SCpnt,
1333 (void *) cmd, (void *) buffer,
1334 512, sd_init_done, SD_TIMEOUT(20 * 100),
1335 MAX_RETRIES5);
1336 down(&sem);
1337 }
1338
1339 the_result = SCpnt->result;
1340 SCpnt->request.rq_status = RQ_INACTIVE(-1); /* Mark as not busy */
1341 wake_up(&SCpnt->device->device_wait);
1342
1343 if ( the_result ) {
1344#ifdef MACH1
1345 printk ("sd%d: test WP failed, assume Write Protected\n",i);
1346#else
1347 printk ("sd%c: test WP failed, assume Write Protected\n",i+'a');
1348#endif
1349 rscsi_disks[i].write_prot = 1;
1350 } else {
1351 rscsi_disks[i].write_prot = ((buffer[2] & 0x80) != 0);
1352#ifdef MACH1
1353 printk ("sd%d: Write Protect is %s\n",i,
1354 rscsi_disks[i].write_prot ? "on" : "off");
1355#else
1356 printk ("sd%c: Write Protect is %s\n",i+'a',
1357 rscsi_disks[i].write_prot ? "on" : "off");
1358#endif
1359 }
1360
1361 } /* check for write protect */
1362
1363 rscsi_disks[i].ten = 1;
1364 rscsi_disks[i].remap = 1;
1365 scsi_free(buffer, 512);
1366 return i;
1367}
1368
1369/*
1370 * The sd_init() function looks at all SCSI drives present, determines
1371 * their size, and reads partition table entries for them.
1372 */
1373
1374static int sd_registered = 0;
1375
1376static int sd_init()
1377{
1378 int i;
1379
1380 if (sd_template.dev_noticed == 0) return 0;
1381
1382 if(!sd_registered) {
1383 if (register_blkdev(MAJOR_NR8,"sd",&sd_fops)) {
1384 printk("Unable to get major %d for SCSI disk\n",MAJOR_NR8);
1385 return 1;
1386 }
1387 sd_registered++;
1388 }
1389
1390 /* We do not support attaching loadable devices yet. */
1391 if(rscsi_disks) return 0;
1392
1393 sd_template.dev_max = sd_template.dev_noticed + SD_EXTRA_DEVS2;
1394
1395 rscsi_disks = (Scsi_Disk *)
1396 scsi_init_malloc(sd_template.dev_max * sizeof(Scsi_Disk), GFP_ATOMIC0x01);
1397 memset(rscsi_disks, 0, sd_template.dev_max * sizeof(Scsi_Disk))(__builtin_constant_p(0) ? (__builtin_constant_p((sd_template
.dev_max * sizeof(Scsi_Disk))) ? __constant_c_and_count_memset
(((rscsi_disks)),((0x01010101UL*(unsigned char)(0))),((sd_template
.dev_max * sizeof(Scsi_Disk)))) : __constant_c_memset(((rscsi_disks
)),((0x01010101UL*(unsigned char)(0))),((sd_template.dev_max *
sizeof(Scsi_Disk))))) : (__builtin_constant_p((sd_template.dev_max
* sizeof(Scsi_Disk))) ? __memset_generic((((rscsi_disks))),(
((0))),(((sd_template.dev_max * sizeof(Scsi_Disk))))) : __memset_generic
(((rscsi_disks)),((0)),((sd_template.dev_max * sizeof(Scsi_Disk
))))));
1398
1399 sd_sizes = (int *) scsi_init_malloc((sd_template.dev_max << 4) *
1400 sizeof(int), GFP_ATOMIC0x01);
1401 memset(sd_sizes, 0, (sd_template.dev_max << 4) * sizeof(int))(__builtin_constant_p(0) ? (__builtin_constant_p(((sd_template
.dev_max << 4) * sizeof(int))) ? __constant_c_and_count_memset
(((sd_sizes)),((0x01010101UL*(unsigned char)(0))),(((sd_template
.dev_max << 4) * sizeof(int)))) : __constant_c_memset((
(sd_sizes)),((0x01010101UL*(unsigned char)(0))),(((sd_template
.dev_max << 4) * sizeof(int))))) : (__builtin_constant_p
(((sd_template.dev_max << 4) * sizeof(int))) ? __memset_generic
((((sd_sizes))),(((0))),((((sd_template.dev_max << 4) *
sizeof(int))))) : __memset_generic(((sd_sizes)),((0)),(((sd_template
.dev_max << 4) * sizeof(int))))));
1402
1403 sd_blocksizes = (int *) scsi_init_malloc((sd_template.dev_max << 4) *
1404 sizeof(int), GFP_ATOMIC0x01);
1405
1406 sd_hardsizes = (int *) scsi_init_malloc((sd_template.dev_max << 4) *
1407 sizeof(int), GFP_ATOMIC0x01);
1408
1409 for(i=0;i<(sd_template.dev_max << 4);i++){
1410 sd_blocksizes[i] = 1024;
1411 sd_hardsizes[i] = 512;
1412 }
1413 blksize_size[MAJOR_NR8] = sd_blocksizes;
1414 hardsect_size[MAJOR_NR8] = sd_hardsizes;
1415 sd = (struct hd_struct *) scsi_init_malloc((sd_template.dev_max << 4) *
1416 sizeof(struct hd_struct),
1417 GFP_ATOMIC0x01);
1418
1419
1420 sd_gendisk.max_nr = sd_template.dev_max;
1421 sd_gendisk.part = sd;
1422 sd_gendisk.sizes = sd_sizes;
1423 sd_gendisk.real_devices = (void *) rscsi_disks;
1424 return 0;
1425}
1426
1427static void sd_finish(void)
1428{
1429 struct gendisk *gendisk;
1430 int i;
1431
1432 blk_dev[MAJOR_NR8].request_fn = DEVICE_REQUESTdo_sd_request;
1433
1434 for (gendisk = gendisk_head; gendisk != NULL((void *) 0); gendisk = gendisk->next)
1435 if (gendisk == &sd_gendisk)
1436 break;
1437 if (gendisk == NULL((void *) 0))
1438 {
1439 sd_gendisk.next = gendisk_head;
1440 gendisk_head = &sd_gendisk;
1441 }
1442
1443 for (i = 0; i < sd_template.dev_max; ++i)
1444 if (!rscsi_disks[i].capacity &&
1445 rscsi_disks[i].device)
1446 {
1447 if (MODULE_FLAGscsi_loadable_module_flag
1448 && !rscsi_disks[i].has_part_table) {
1449 sd_sizes[i << 4] = rscsi_disks[i].capacity;
1450 /* revalidate does sd_init_onedisk via MAYBE_REINIT*/
1451 revalidate_scsidisk(MKDEV(MAJOR_NR, i << 4)(((8) << 8) | (i << 4)), 0);
1452 }
1453 else
1454 i=sd_init_onedisk(i);
1455 rscsi_disks[i].has_part_table = 1;
1456 }
1457
1458 /* If our host adapter is capable of scatter-gather, then we increase
1459 * the read-ahead to 16 blocks (32 sectors). If not, we use
1460 * a two block (4 sector) read ahead.
1461 */
1462 if(rscsi_disks[0].device && rscsi_disks[0].device->host->sg_tablesize)
1463 read_ahead[MAJOR_NR8] = 120; /* 120 sector read-ahead */
1464 else
1465 read_ahead[MAJOR_NR8] = 4; /* 4 sector read-ahead */
1466
1467 return;
1468}
1469
1470static int sd_detect(Scsi_Device * SDp){
1471 if(SDp->type != TYPE_DISK0x00 && SDp->type != TYPE_MOD0x07) return 0;
1472
1473#ifdef MACH1
1474 printk("Detected scsi %sdisk sd%d at scsi%d, channel %d, id %d, lun %d\n",
1475 SDp->removable ? "removable " : "",
1476 sd_template.dev_noticed++,
1477 SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
1478#else
1479 printk("Detected scsi %sdisk sd%c at scsi%d, channel %d, id %d, lun %d\n",
1480 SDp->removable ? "removable " : "",
1481 'a'+ (sd_template.dev_noticed++),
1482 SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
1483#endif
1484
1485 return 1;
1486}
1487
1488static int sd_attach(Scsi_Device * SDp){
1489 Scsi_Disk * dpnt;
1490 int i;
1491
1492 if(SDp->type != TYPE_DISK0x00 && SDp->type != TYPE_MOD0x07) return 0;
1493
1494 if(sd_template.nr_dev >= sd_template.dev_max) {
1495 SDp->attached--;
1496 return 1;
1497 }
1498
1499 for(dpnt = rscsi_disks, i=0; i<sd_template.dev_max; i++, dpnt++)
1500 if(!dpnt->device) break;
1501
1502 if(i >= sd_template.dev_max) panic ("scsi_devices corrupt (sd)");
1503
1504 SDp->scsi_request_fn = do_sd_request;
1505 rscsi_disks[i].device = SDp;
1506 rscsi_disks[i].has_part_table = 0;
1507 sd_template.nr_dev++;
1508 sd_gendisk.nr_real++;
1509 return 0;
1510}
1511
1512#define DEVICE_BUSYrscsi_disks[target].device->busy rscsi_disks[target].device->busy
1513#define USAGErscsi_disks[target].device->access_count rscsi_disks[target].device->access_count
1514#define CAPACITYrscsi_disks[target].capacity rscsi_disks[target].capacity
1515#define MAYBE_REINITsd_init_onedisk(target) sd_init_onedisk(target)
1516#define GENDISK_STRUCTsd_gendisk sd_gendisk
1517
1518/* This routine is called to flush all partitions and partition tables
1519 * for a changed scsi disk, and then re-read the new partition table.
1520 * If we are revalidating a disk because of a media change, then we
1521 * enter with usage == 0. If we are using an ioctl, we automatically have
1522 * usage == 1 (we need an open channel to use an ioctl :-), so this
1523 * is our limit.
1524 */
1525int revalidate_scsidisk(kdev_t dev, int maxusage){
1526 int target;
1527 struct gendisk * gdev;
1528 unsigned long flags;
1529 int max_p;
1530 int start;
1531 int i;
1532
1533 target = DEVICE_NR(dev)(((dev) & ((1<<8) - 1)) >> 4);
1534 gdev = &GENDISK_STRUCTsd_gendisk;
1535
1536 save_flags(flags)__asm__ __volatile__("pushf ; pop %0" : "=r" (flags): :"memory"
);
1537 cli()__asm__ __volatile__ ("cli": : :"memory");
1538 if (DEVICE_BUSYrscsi_disks[target].device->busy || USAGErscsi_disks[target].device->access_count > maxusage) {
1539 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
1540 printk("Device busy for revalidation (usage=%d)\n", USAGErscsi_disks[target].device->access_count);
1541 return -EBUSY16;
1542 }
1543 DEVICE_BUSYrscsi_disks[target].device->busy = 1;
1544 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
1545
1546 max_p = gdev->max_p;
1547 start = target << gdev->minor_shift;
1548
1549 for (i=max_p - 1; i >=0 ; i--) {
1550 int minor = start+i;
1551 kdev_t devi = MKDEV(MAJOR_NR, minor)(((8) << 8) | (minor));
1552 sync_dev(devi);
1553 invalidate_inodes(devi);
1554 invalidate_buffers(devi);
1555 gdev->part[minor].start_sect = 0;
1556 gdev->part[minor].nr_sects = 0;
1557 /*
1558 * Reset the blocksize for everything so that we can read
1559 * the partition table.
1560 */
1561 blksize_size[MAJOR_NR8][minor] = 1024;
1562 }
1563
1564#ifdef MAYBE_REINITsd_init_onedisk(target)
1565 MAYBE_REINITsd_init_onedisk(target);
1566#endif
1567
1568 gdev->part[start].nr_sects = CAPACITYrscsi_disks[target].capacity;
1569 resetup_one_dev(gdev, target);
1570
1571 DEVICE_BUSYrscsi_disks[target].device->busy = 0;
1572 return 0;
1573}
1574
1575static int fop_revalidate_scsidisk(kdev_t dev){
1576 return revalidate_scsidisk(dev, 0);
1577}
1578
1579
1580static void sd_detach(Scsi_Device * SDp)
1581{
1582 Scsi_Disk * dpnt;
1583 int i;
1584 int max_p;
1585 int start;
1586
1587 for(dpnt = rscsi_disks, i=0; i<sd_template.dev_max; i++, dpnt++)
1588 if(dpnt->device == SDp) {
1589
1590 /* If we are disconnecting a disk driver, sync and invalidate
1591 * everything */
1592 max_p = sd_gendisk.max_p;
1593 start = i << sd_gendisk.minor_shift;
1594
1595 for (i=max_p - 1; i >=0 ; i--) {
1596 int minor = start+i;
1597 kdev_t devi = MKDEV(MAJOR_NR, minor)(((8) << 8) | (minor));
Value stored to 'devi' during its initialization is never read
1598 sync_dev(devi);
1599 invalidate_inodes(devi);
1600 invalidate_buffers(devi);
1601 sd_gendisk.part[minor].start_sect = 0;
1602 sd_gendisk.part[minor].nr_sects = 0;
1603 sd_sizes[minor] = 0;
1604 }
1605
1606 dpnt->has_part_table = 0;
1607 dpnt->device = NULL((void *) 0);
1608 dpnt->capacity = 0;
1609 SDp->attached--;
1610 sd_template.dev_noticed--;
1611 sd_template.nr_dev--;
1612 sd_gendisk.nr_real--;
1613 return;
1614 }
1615 return;
1616}
1617
1618#ifdef MODULE
1619
1620int init_module(void) {
1621 sd_template.usage_count = &mod_use_count_;
1622 return scsi_register_module(MODULE_SCSI_DEV4, &sd_template);
1623}
1624
1625void cleanup_module( void)
1626{
1627 struct gendisk * prev_sdgd;
1628 struct gendisk * sdgd;
1629
1630 scsi_unregister_module(MODULE_SCSI_DEV4, &sd_template);
1631 unregister_blkdev(SCSI_DISK_MAJOR8, "sd");
1632 sd_registered--;
1633 if( rscsi_disks != NULL((void *) 0) )
1634 {
1635 scsi_init_free((char *) rscsi_disks,
1636 (sd_template.dev_noticed + SD_EXTRA_DEVS2)
1637 * sizeof(Scsi_Disk));
1638
1639 scsi_init_free((char *) sd_sizes, sd_template.dev_max * sizeof(int));
1640 scsi_init_free((char *) sd_blocksizes, sd_template.dev_max * sizeof(int));
1641 scsi_init_free((char *) sd_hardsizes, sd_template.dev_max * sizeof(int));
1642 scsi_init_free((char *) sd,
1643 (sd_template.dev_max << 4) * sizeof(struct hd_struct));
1644 /*
1645 * Now remove sd_gendisk from the linked list
1646 */
1647 sdgd = gendisk_head;
1648 prev_sdgd = NULL((void *) 0);
1649 while(sdgd != &sd_gendisk)
1650 {
1651 prev_sdgd = sdgd;
1652 sdgd = sdgd->next;
1653 }
1654
1655 if(sdgd != &sd_gendisk)
1656 printk("sd_gendisk not in disk chain.\n");
1657 else {
1658 if(prev_sdgd != NULL((void *) 0))
1659 prev_sdgd->next = sdgd->next;
1660 else
1661 gendisk_head = sdgd->next;
1662 }
1663 }
1664
1665 blksize_size[MAJOR_NR8] = NULL((void *) 0);
1666 blk_dev[MAJOR_NR8].request_fn = NULL((void *) 0);
1667 blk_size[MAJOR_NR8] = NULL((void *) 0);
1668 hardsect_size[MAJOR_NR8] = NULL((void *) 0);
1669 read_ahead[MAJOR_NR8] = 0;
1670 sd_template.dev_max = 0;
1671}
1672#endif /* MODULE */
1673
1674/*
1675 * Overrides for Emacs so that we almost follow Linus's tabbing style.
1676 * Emacs will notice this stuff at the end of the file and automatically
1677 * adjust the settings for this buffer only. This must remain at the end
1678 * of the file.
1679 * ---------------------------------------------------------------------------
1680 * Local variables:
1681 * c-indent-level: 4
1682 * c-brace-imaginary-offset: 0
1683 * c-brace-offset: -4
1684 * c-argdecl-indent: 4
1685 * c-label-offset: -4
1686 * c-continued-statement-offset: 4
1687 * c-continued-brace-offset: 0
1688 * indent-tabs-mode: nil
1689 * tab-width: 8
1690 * End:
1691 */