Bug Summary

File:obj-scan-build/../linux/src/drivers/scsi/sr.c
Location:line 306, column 5
Description:Value stored to 'result' is never read

Annotated Source Code

1/*
2 * sr.c Copyright (C) 1992 David Giller
3 * Copyright (C) 1993, 1994, 1995 Eric Youngdale
4 *
5 * adapted from:
6 * sd.c Copyright (C) 1992 Drew Eckhardt
7 * Linux scsi disk driver by
8 * Drew Eckhardt <drew@colorado.edu>
9 *
10 * Modified by Eric Youngdale ericy@cais.com to
11 * add scatter-gather, multiple outstanding request, and other
12 * enhancements.
13 *
14 * Modified by Eric Youngdale eric@aib.com to support loadable
15 * low-level scsi drivers.
16 *
17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
18 * provide auto-eject.
19 *
20 */
21
22#include <linux/module.h>
23
24#include <linux/fs.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/mm.h>
28#include <linux/string.h>
29#include <linux/errno.h>
30#include <linux/cdrom.h>
31#include <linux/interrupt.h>
32#include <asm/system.h>
33
34#define MAJOR_NR11 SCSI_CDROM_MAJOR11
35#include <linux/blk.h>
36#include "scsi.h"
37#include "hosts.h"
38#include "sr.h"
39#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
40#include "constants.h"
41
42#define MAX_RETRIES3 3
43#define SR_TIMEOUT(30 * 100) (30 * HZ100)
44
45static int sr_init(void);
46static void sr_finish(void);
47static int sr_attach(Scsi_Device *);
48static int sr_detect(Scsi_Device *);
49static void sr_detach(Scsi_Device *);
50
51struct Scsi_Device_Template sr_template = {NULL((void *) 0), "cdrom", "sr", NULL((void *) 0), TYPE_ROM0x05,
52 SCSI_CDROM_MAJOR11, 0, 0, 0, 1,
53 sr_detect, sr_init,
54 sr_finish, sr_attach, sr_detach};
55
56Scsi_CD * scsi_CDs = NULL((void *) 0);
57static int * sr_sizes;
58
59static int * sr_blocksizes;
60
61static int sr_open(struct inode *, struct file *);
62void get_sectorsize(int);
63void sr_photocd(struct inode *);
64
65extern int sr_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
66
67void requeue_sr_request (Scsi_Cmnd * SCpnt);
68static int check_cdrom_media_change(kdev_t);
69
70static void sr_release(struct inode * inode, struct file * file)
71{
72 sync_dev(inode->i_rdev);
73 if(! --scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->access_count)
74 {
75 sr_ioctl(inode, NULL((void *) 0), SCSI_IOCTL_DOORUNLOCK0x5381, 0);
76 if (scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].auto_eject)
77 sr_ioctl(inode, NULL((void *) 0), CDROMEJECT0x5309, 0);
78 }
79 if (scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->host->hostt->usage_count)
80 (*scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->host->hostt->usage_count)--;
81 if(sr_template.usage_count) (*sr_template.usage_count)--;
82}
83
84static struct file_operations sr_fops =
85{
86 NULL((void *) 0), /* lseek - default */
87 block_read, /* read - general block-dev read */
88 block_write, /* write - general block-dev write */
89 NULL((void *) 0), /* readdir - bad */
90 NULL((void *) 0), /* select */
91 sr_ioctl, /* ioctl */
92 NULL((void *) 0), /* mmap */
93 sr_open, /* special open code */
94 sr_release, /* release */
95 NULL((void *) 0), /* fsync */
96 NULL((void *) 0), /* fasync */
97 check_cdrom_media_change, /* Disk change */
98 NULL((void *) 0) /* revalidate */
99};
100
101/*
102 * This function checks to see if the media has been changed in the
103 * CDROM drive. It is possible that we have already sensed a change,
104 * or the drive may have sensed one and not yet reported it. We must
105 * be ready for either case. This function always reports the current
106 * value of the changed bit. If flag is 0, then the changed bit is reset.
107 * This function could be done as an ioctl, but we would need to have
108 * an inode for that to work, and we do not always have one.
109 */
110
111int check_cdrom_media_change(kdev_t full_dev){
112 int retval, target;
113 struct inode inode;
114 int flag = 0;
115
116 target = MINOR(full_dev)((full_dev) & ((1<<8) - 1));
117
118 if (target >= sr_template.nr_dev) {
119 printk("CD-ROM request error: invalid device.\n");
120 return 0;
121 };
122
123 inode.i_rdev = full_dev; /* This is all we really need here */
124 retval = sr_ioctl(&inode, NULL((void *) 0), SCSI_IOCTL_TEST_UNIT_READY2, 0);
125
126 if(retval){ /* Unable to test, unit probably not ready. This usually
127 * means there is no disc in the drive. Mark as changed,
128 * and we will figure it out later once the drive is
129 * available again. */
130
131 scsi_CDs[target].device->changed = 1;
132 return 1; /* This will force a flush, if called from
133 * check_disk_change */
134 };
135
136 retval = scsi_CDs[target].device->changed;
137 if(!flag) {
138 scsi_CDs[target].device->changed = 0;
139 /* If the disk changed, the capacity will now be different,
140 * so we force a re-read of this information */
141 if (retval) scsi_CDs[target].needs_sector_size = 1;
142 };
143 return retval;
144}
145
146/*
147 * rw_intr is the interrupt routine for the device driver. It will be notified on the
148 * end of a SCSI read / write, and will take on of several actions based on success or failure.
149 */
150
151static void rw_intr (Scsi_Cmnd * SCpnt)
152{
153 int result = SCpnt->result;
154 int this_count = SCpnt->this_count;
155 int good_sectors = (result == 0 ? this_count : 0);
156 int block_sectors = 0;
157
158#ifdef DEBUG
159 printk("sr.c done: %x %x\n",result, SCpnt->request.bh->b_data);
160#endif
161 /*
162 Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial success.
163 Since this is a relatively rare error condition, no care is taken to
164 avoid unnecessary additional work such as memcpy's that could be avoided.
165 */
166
167 if (driver_byte(result)(((result) >> 24) & 0xff) != 0 && /* An error occurred */
168 SCpnt->sense_buffer[0] == 0xF0 && /* Sense data is valid */
169 (SCpnt->sense_buffer[2] == MEDIUM_ERROR0x03 ||
170 SCpnt->sense_buffer[2] == VOLUME_OVERFLOW0x0d ||
171 SCpnt->sense_buffer[2] == ILLEGAL_REQUEST0x05))
172 {
173 long error_sector = (SCpnt->sense_buffer[3] << 24) |
174 (SCpnt->sense_buffer[4] << 16) |
175 (SCpnt->sense_buffer[5] << 8) |
176 SCpnt->sense_buffer[6];
177 int device_nr = DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)));
178 if (SCpnt->request.bh != NULL((void *) 0))
179 block_sectors = SCpnt->request.bh->b_size >> 9;
180 if (block_sectors < 4) block_sectors = 4;
181 if (scsi_CDs[device_nr].sector_size == 2048)
182 error_sector <<= 2;
183 error_sector &= ~ (block_sectors - 1);
184 good_sectors = error_sector - SCpnt->request.sector;
185 if (good_sectors < 0 || good_sectors >= this_count)
186 good_sectors = 0;
187 /*
188 The SCSI specification allows for the value returned by READ
189 CAPACITY to be up to 75 2K sectors past the last readable
190 block. Therefore, if we hit a medium error within the last
191 75 2K sectors, we decrease the saved size value.
192 */
193 if ((error_sector >> 1) < sr_sizes[device_nr] &&
194 scsi_CDs[device_nr].capacity - error_sector < 4*75)
195 sr_sizes[device_nr] = error_sector >> 1;
196 }
197
198 if (good_sectors > 0)
199 { /* Some sectors were read successfully. */
200 if (SCpnt->use_sg == 0) {
201 if (SCpnt->buffer != SCpnt->request.buffer)
202 {
203 int offset;
204 offset = (SCpnt->request.sector % 4) << 9;
205 memcpy((char *)SCpnt->request.buffer,(__builtin_constant_p(good_sectors << 9) ? __constant_memcpy
(((char *)SCpnt->request.buffer),((char *)SCpnt->buffer
+ offset),(good_sectors << 9)) : __memcpy(((char *)SCpnt
->request.buffer),((char *)SCpnt->buffer + offset),(good_sectors
<< 9)))
206 (char *)SCpnt->buffer + offset,(__builtin_constant_p(good_sectors << 9) ? __constant_memcpy
(((char *)SCpnt->request.buffer),((char *)SCpnt->buffer
+ offset),(good_sectors << 9)) : __memcpy(((char *)SCpnt
->request.buffer),((char *)SCpnt->buffer + offset),(good_sectors
<< 9)))
207 good_sectors << 9)(__builtin_constant_p(good_sectors << 9) ? __constant_memcpy
(((char *)SCpnt->request.buffer),((char *)SCpnt->buffer
+ offset),(good_sectors << 9)) : __memcpy(((char *)SCpnt
->request.buffer),((char *)SCpnt->buffer + offset),(good_sectors
<< 9)));
208 /* Even though we are not using scatter-gather, we look
209 * ahead and see if there is a linked request for the
210 * other half of this buffer. If there is, then satisfy
211 * it. */
212 if((offset == 0) && good_sectors == 2 &&
213 SCpnt->request.nr_sectors > good_sectors &&
214 SCpnt->request.bh &&
215 SCpnt->request.bh->b_reqnext &&
216 SCpnt->request.bh->b_reqnext->b_size == 1024) {
217 memcpy((char *)SCpnt->request.bh->b_reqnext->b_data,(__builtin_constant_p(1024) ? __constant_memcpy(((char *)SCpnt
->request.bh->b_reqnext->b_data),((char *)SCpnt->
buffer + 1024),(1024)) : __memcpy(((char *)SCpnt->request.
bh->b_reqnext->b_data),((char *)SCpnt->buffer + 1024
),(1024)))
218 (char *)SCpnt->buffer + 1024,(__builtin_constant_p(1024) ? __constant_memcpy(((char *)SCpnt
->request.bh->b_reqnext->b_data),((char *)SCpnt->
buffer + 1024),(1024)) : __memcpy(((char *)SCpnt->request.
bh->b_reqnext->b_data),((char *)SCpnt->buffer + 1024
),(1024)))
219 1024)(__builtin_constant_p(1024) ? __constant_memcpy(((char *)SCpnt
->request.bh->b_reqnext->b_data),((char *)SCpnt->
buffer + 1024),(1024)) : __memcpy(((char *)SCpnt->request.
bh->b_reqnext->b_data),((char *)SCpnt->buffer + 1024
),(1024)));
220 good_sectors += 2;
221 };
222
223 scsi_free(SCpnt->buffer, 2048);
224 }
225 } else {
226 struct scatterlist * sgpnt;
227 int i;
228 sgpnt = (struct scatterlist *) SCpnt->buffer;
229 for(i=0; i<SCpnt->use_sg; i++) {
230 if (sgpnt[i].alt_address) {
231 if (sgpnt[i].alt_address != sgpnt[i].address) {
232 memcpy(sgpnt[i].alt_address, sgpnt[i].address, 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))
);
233 };
234 scsi_free(sgpnt[i].address, sgpnt[i].length);
235 };
236 };
237 scsi_free(SCpnt->buffer, SCpnt->sglist_len); /* Free list of scatter-gather pointers */
238 if(SCpnt->request.sector % 4) good_sectors -= 2;
239 /* See if there is a padding record at the end that needs to be removed */
240 if(good_sectors > SCpnt->request.nr_sectors)
241 good_sectors -= 2;
242 };
243
244#ifdef DEBUG
245 printk("(%x %x %x) ",SCpnt->request.bh, SCpnt->request.nr_sectors,
246 good_sectors);
247#endif
248 if (SCpnt->request.nr_sectors > this_count)
249 {
250 SCpnt->request.errors = 0;
251 if (!SCpnt->request.bh)
252 panic("sr.c: linked page request (%lx %x)",
253 SCpnt->request.sector, this_count);
254 }
255
256 SCpnt = end_scsi_request(SCpnt, 1, good_sectors); /* All done */
257 if (result == 0)
258 {
259 requeue_sr_request(SCpnt);
260 return;
261 }
262 }
263
264 if (good_sectors == 0) {
265 /* We only come through here if no sectors were read successfully. */
266
267 /* Free up any indirection buffers we allocated for DMA purposes. */
268 if (SCpnt->use_sg) {
269 struct scatterlist * sgpnt;
270 int i;
271 sgpnt = (struct scatterlist *) SCpnt->buffer;
272 for(i=0; i<SCpnt->use_sg; i++) {
273 if (sgpnt[i].alt_address) {
274 scsi_free(sgpnt[i].address, sgpnt[i].length);
275 }
276 }
277 scsi_free(SCpnt->buffer, SCpnt->sglist_len); /* Free list of scatter-gather pointers */
278 } else {
279 if (SCpnt->buffer != SCpnt->request.buffer)
280 scsi_free(SCpnt->buffer, SCpnt->bufflen);
281 }
282
283 }
284
285 if (driver_byte(result)(((result) >> 24) & 0xff) != 0) {
286 if ((SCpnt->sense_buffer[0] & 0x7f) == 0x70) {
287 if ((SCpnt->sense_buffer[2] & 0xf) == UNIT_ATTENTION0x06) {
288 /* detected disc change. set a bit and quietly refuse
289 * further access. */
290
291 scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)))].device->changed = 1;
292 SCpnt = end_scsi_request(SCpnt, 0, this_count);
293 requeue_sr_request(SCpnt);
294 return;
295 }
296 }
297
298 if (SCpnt->sense_buffer[2] == ILLEGAL_REQUEST0x05) {
299 printk("CD-ROM error: ");
300 print_sense("sr", SCpnt);
301 printk("command was: ");
302 print_command(SCpnt->cmnd);
303 if (scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)))].ten) {
304 scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)))].ten = 0;
305 requeue_sr_request(SCpnt);
306 result = 0;
Value stored to 'result' is never read
307 return;
308 } else {
309 SCpnt = end_scsi_request(SCpnt, 0, this_count);
310 requeue_sr_request(SCpnt); /* Do next request */
311 return;
312 }
313
314 }
315
316 if (SCpnt->sense_buffer[2] == NOT_READY0x02) {
317 printk("CD-ROM not ready. Make sure you have a disc in the drive.\n");
318 SCpnt = end_scsi_request(SCpnt, 0, this_count);
319 requeue_sr_request(SCpnt); /* Do next request */
320 return;
321 }
322
323 if (SCpnt->sense_buffer[2] == MEDIUM_ERROR0x03) {
324 printk("scsi%d: MEDIUM ERROR on "
325 "channel %d, id %d, lun %d, CDB: ",
326 SCpnt->host->host_no, (int) SCpnt->channel,
327 (int) SCpnt->target, (int) SCpnt->lun);
328 print_command(SCpnt->cmnd);
329 print_sense("sr", SCpnt);
330 SCpnt = end_scsi_request(SCpnt, 0, block_sectors);
331 requeue_sr_request(SCpnt);
332 return;
333 }
334
335 if (SCpnt->sense_buffer[2] == VOLUME_OVERFLOW0x0d) {
336 printk("scsi%d: VOLUME OVERFLOW on "
337 "channel %d, id %d, lun %d, CDB: ",
338 SCpnt->host->host_no, (int) SCpnt->channel,
339 (int) SCpnt->target, (int) SCpnt->lun);
340 print_command(SCpnt->cmnd);
341 print_sense("sr", SCpnt);
342 SCpnt = end_scsi_request(SCpnt, 0, block_sectors);
343 requeue_sr_request(SCpnt);
344 return;
345 }
346 }
347
348 /* We only get this far if we have an error we have not recognized */
349 if(result) {
350 printk("SCSI CD error : host %d id %d lun %d return code = %03x\n",
351 scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)))].device->host->host_no,
352 scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)))].device->id,
353 scsi_CDs[DEVICE_NR(SCpnt->request.rq_dev)(((SCpnt->request.rq_dev) & ((1<<8) - 1)))].device->lun,
354 result);
355
356 if (status_byte(result)(((result) >> 1) & 0x1f) == CHECK_CONDITION0x01)
357 print_sense("sr", SCpnt);
358
359 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.current_nr_sectors);
360 requeue_sr_request(SCpnt);
361 }
362}
363
364/*
365 * Here I tried to implement support for multisession-CD's
366 *
367 * Much of this has do be done with vendor-specific SCSI-commands, because
368 * multisession is newer than the SCSI-II standard.
369 * So I have to complete it step by step. Useful information is welcome.
370 *
371 * Actually works:
372 * - NEC: Detection and support of multisession CD's. Special handling
373 * for XA-disks is not necessary.
374 *
375 * - TOSHIBA: setting density is done here now, mounting PhotoCD's should
376 * work now without running the program "set_density"
377 * Multisession CD's are supported too.
378 *
379 * Gerd Knorr <kraxel@cs.tu-berlin.de>
380 */
381/*
382 * 19950704 operator@melchior.cuivre.fdn.fr (Thomas Quinot)
383 *
384 * - SONY: Same as Nec.
385 *
386 * - PIONEER: works with SONY code (may be others too ?)
387 */
388
389void sr_photocd(struct inode *inode)
390{
391 unsigned long sector,min,sec,frame;
392 unsigned char buf[40]; /* the buffer for the ioctl */
393 unsigned char *cmd; /* the scsi-command */
394 unsigned char *send; /* the data we send to the drive ... */
395 unsigned char *rec; /* ... and get back */
396 int rc,is_xa,no_multi;
397
398 if (scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].xa_flags & 0x02) {
399#ifdef DEBUG
400 printk(KERN_DEBUG"<7>" "sr_photocd: CDROM and/or driver do not support multisession CD's");
401#endif
402 return;
403 }
404
405 if (!suser()) {
406 /* I'm not the superuser, so SCSI_IOCTL_SEND_COMMAND isn't allowed
407 * for me. That's why mpcd_sector will be initialized with zero,
408 * because I'm not able to get the right value. Necessary only if
409 * access_count is 1, else no disk change happened since the last
410 * call of this function and we can keep the old value.
411 */
412 if (1 == scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->access_count) {
413 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].mpcd_sector = 0;
414 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].xa_flags &= ~0x01;
415 }
416 return;
417 }
418
419 sector = 0;
420 is_xa = 0;
421 no_multi = 0;
422 cmd = rec = &buf[8];
423
424 switch(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->manufacturer) {
425
426 case SCSI_MAN_NEC1:
427#ifdef DEBUG
428 printk(KERN_DEBUG"<7>" "sr_photocd: use NEC code\n");
429#endif
430 memset(buf,0,40)(__builtin_constant_p(0) ? (__builtin_constant_p((40)) ? __constant_c_and_count_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40))) : __constant_c_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40)))) : (__builtin_constant_p
((40)) ? __memset_generic((((buf))),(((0))),(((40)))) : __memset_generic
(((buf)),((0)),((40)))));
431 *((unsigned int*)buf) = 0x0; /* we send nothing... */
432 *((unsigned int*)buf+1) = 0x16; /* and receive 0x16 bytes */
433 cmd[0] = 0xde;
434 cmd[1] = 0x03;
435 cmd[2] = 0xb0;
436 rc = kernel_scsi_ioctl(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device,
437 SCSI_IOCTL_SEND_COMMAND1, buf);
438 if (rc != 0) {
439 if (rc != 0x28000002) /* drop "not ready" */
440 printk(KERN_WARNING"<4>""sr_photocd: ioctl error (NEC): 0x%x\n",rc);
441 break;
442 }
443 if (rec[14] != 0 && rec[14] != 0xb0) {
444 printk(KERN_INFO"<6>""sr_photocd: (NEC) Hmm, seems the CDROM doesn't support multisession CD's\n");
445 no_multi = 1;
446 break;
447 }
448 min = (unsigned long) rec[15]/16*10 + (unsigned long) rec[15]%16;
449 sec = (unsigned long) rec[16]/16*10 + (unsigned long) rec[16]%16;
450 frame = (unsigned long) rec[17]/16*10 + (unsigned long) rec[17]%16;
451 sector = min*CD_SECS60*CD_FRAMES75 + sec*CD_FRAMES75 + frame;
452 is_xa = (rec[14] == 0xb0);
453#ifdef DEBUG
454 if (sector) {
455 printk(KERN_DEBUG"<7>" "sr_photocd: multisession CD detected. start: %lu\n",sector);
456 }
457#endif
458 break;
459
460 case SCSI_MAN_TOSHIBA2:
461#ifdef DEBUG
462 printk(KERN_DEBUG"<7>" "sr_photocd: use TOSHIBA code\n");
463#endif
464
465 /* we request some disc information (is it a XA-CD ?,
466 * where starts the last session ?) */
467 memset(buf,0,40)(__builtin_constant_p(0) ? (__builtin_constant_p((40)) ? __constant_c_and_count_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40))) : __constant_c_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40)))) : (__builtin_constant_p
((40)) ? __memset_generic((((buf))),(((0))),(((40)))) : __memset_generic
(((buf)),((0)),((40)))));
468 *((unsigned int*)buf) = (unsigned int) 0;
469 *((unsigned int*)buf+1) = (unsigned int) 4; /* receive 4 bytes */
470 cmd[0] = (unsigned char) 0x00c7;
471 cmd[1] = (unsigned char) 3;
472 rc = kernel_scsi_ioctl(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device,
473 SCSI_IOCTL_SEND_COMMAND1, buf);
474 if (rc != 0) {
475 if (rc == 0x28000002) {
476 /* Got a "not ready" - error. No chance to find out if this is
477 * because there is no CD in the drive or because the drive
478 * don't knows multisession CD's. So I need to do an extra
479 * check... */
480 if (!kernel_scsi_ioctl(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device,
481 SCSI_IOCTL_TEST_UNIT_READY2, NULL((void *) 0))) {
482 printk(KERN_INFO"<6>" "sr_photocd: (TOSHIBA) Hmm, seems the CDROM doesn't support multisession CD's\n");
483 no_multi = 1;
484 }
485 } else
486 printk(KERN_INFO"<6>""sr_photocd: ioctl error (TOSHIBA #1): 0x%x\n",rc);
487 break; /* if the first ioctl fails, we don't call the second one */
488 }
489 is_xa = (rec[0] == 0x20);
490 min = (unsigned long) rec[1]/16*10 + (unsigned long) rec[1]%16;
491 sec = (unsigned long) rec[2]/16*10 + (unsigned long) rec[2]%16;
492 frame = (unsigned long) rec[3]/16*10 + (unsigned long) rec[3]%16;
493 sector = min*CD_SECS60*CD_FRAMES75 + sec*CD_FRAMES75 + frame;
494 if (sector) {
495 sector -= CD_BLOCK_OFFSET150;
496#ifdef DEBUG
497 printk(KERN_DEBUG"<7>" "sr_photocd: multisession CD detected: start: %lu\n",sector);
498#endif
499 }
500
501 /* now we do a get_density... */
502 memset(buf,0,40)(__builtin_constant_p(0) ? (__builtin_constant_p((40)) ? __constant_c_and_count_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40))) : __constant_c_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40)))) : (__builtin_constant_p
((40)) ? __memset_generic((((buf))),(((0))),(((40)))) : __memset_generic
(((buf)),((0)),((40)))));
503 *((unsigned int*)buf) = (unsigned int) 0;
504 *((unsigned int*)buf+1) = (unsigned int) 12;
505 cmd[0] = (unsigned char) MODE_SENSE0x1a;
506 cmd[2] = (unsigned char) 1;
507 cmd[4] = (unsigned char) 12;
508 rc = kernel_scsi_ioctl(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device,
509 SCSI_IOCTL_SEND_COMMAND1, buf);
510 if (rc != 0) {
511 printk(KERN_WARNING"<4>" "sr_photocd: ioctl error (TOSHIBA #2): 0x%x\n",rc);
512 break;
513 }
514#ifdef DEBUG
515 printk(KERN_DEBUG"<7>" "sr_photocd: get_density: 0x%x\n",rec[4]);
516#endif
517
518 /* ...and only if necessary a set_density */
519 if ((rec[4] != 0x81 && is_xa) || (rec[4] != 0 && !is_xa)) {
520#ifdef DEBUG
521 printk(KERN_DEBUG"<7>" "sr_photocd: doing set_density\n");
522#endif
523 memset(buf,0,40)(__builtin_constant_p(0) ? (__builtin_constant_p((40)) ? __constant_c_and_count_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40))) : __constant_c_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40)))) : (__builtin_constant_p
((40)) ? __memset_generic((((buf))),(((0))),(((40)))) : __memset_generic
(((buf)),((0)),((40)))));
524 *((unsigned int*)buf) = (unsigned int) 12; /* send 12 bytes */
525 *((unsigned int*)buf+1) = (unsigned int) 0;
526 cmd[0] = (unsigned char) MODE_SELECT0x15;
527 cmd[1] = (unsigned char) (1 << 4);
528 cmd[4] = (unsigned char) 12;
529 send = &cmd[6]; /* this is a 6-Byte command */
530 send[ 3] = (unsigned char) 0x08; /* data for cmd */
531 /* density 0x81 for XA, 0 else */
532 send[ 4] = (is_xa) ?
533 (unsigned char) 0x81 : (unsigned char) 0;
534 send[10] = (unsigned char) 0x08;
535 rc = kernel_scsi_ioctl(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device,
536 SCSI_IOCTL_SEND_COMMAND1, buf);
537 if (rc != 0) {
538 printk(KERN_WARNING"<4>" "sr_photocd: ioctl error (TOSHIBA #3): 0x%x\n",rc);
539 }
540 /* The set_density command may have changed the
541 * sector size or capacity. */
542 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].needs_sector_size = 1;
543 }
544 break;
545
546 case SCSI_MAN_SONY4: /* Thomas QUINOT <thomas@melchior.cuivre.fdn.fr> */
547 case SCSI_MAN_PIONEER5:
548 case SCSI_MAN_UNKNOWN0:
549#ifdef DEBUG
550 printk(KERN_DEBUG"<7>" "sr_photocd: use SONY/PIONEER code\n");
551#endif
552 get_sectorsize(MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))); /* spinup (avoid timeout) */
553 memset(buf,0,40)(__builtin_constant_p(0) ? (__builtin_constant_p((40)) ? __constant_c_and_count_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40))) : __constant_c_memset
(((buf)),((0x01010101UL*(unsigned char)(0))),((40)))) : (__builtin_constant_p
((40)) ? __memset_generic((((buf))),(((0))),(((40)))) : __memset_generic
(((buf)),((0)),((40)))));
554 *((unsigned int*)buf) = 0x0; /* we send nothing... */
555 *((unsigned int*)buf+1) = 0x0c; /* and receive 0x0c bytes */
556 cmd[0] = READ_TOC0x43;
557 cmd[8] = 0x0c;
558 cmd[9] = 0x40;
559 rc = kernel_scsi_ioctl(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device,
560 SCSI_IOCTL_SEND_COMMAND1, buf);
561
562 if (rc != 0) {
563 if (rc != 0x28000002) /* drop "not ready" */
564 printk(KERN_WARNING"<4>" "sr_photocd: ioctl error (SONY/PIONEER): 0x%x\n",rc);
565 break;
566 }
567 if ((rec[0] << 8) + rec[1] < 0x0a) {
568 printk(KERN_INFO"<6>" "sr_photocd: (SONY/PIONEER) Hmm, seems the CDROM doesn't support multisession CD's\n");
569 no_multi = 1;
570 break;
571 }
572 sector = rec[11] + (rec[10] << 8) + (rec[9] << 16) + (rec[8] << 24);
573 is_xa = !!sector;
574#ifdef DEBUG
575 if (sector)
576 printk (KERN_DEBUG"<7>" "sr_photocd: multisession CD detected. start: %lu\n",sector);
577#endif
578 break;
579
580 case SCSI_MAN_NEC_OLDCDR3:
581 default:
582 sector = 0;
583 no_multi = 1;
584 break; }
585
586 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].mpcd_sector = sector;
587 if (is_xa)
588 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].xa_flags |= 0x01;
589 else
590 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].xa_flags &= ~0x01;
591 if (no_multi)
592 scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].xa_flags |= 0x02;
593 return;
594}
595
596static int sr_open(struct inode * inode, struct file * filp)
597{
598 if(MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1)) >= sr_template.nr_dev ||
599 !scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device) return -ENXIO6; /* No such device */
600
601 if (filp->f_mode & 2)
602 return -EROFS30;
603
604 if(sr_template.usage_count) (*sr_template.usage_count)++;
605
606 sr_ioctl(inode,filp,CDROMCLOSETRAY0x5319,0);
607 check_disk_change(inode->i_rdev);
608
609 if(!scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->access_count++)
610 sr_ioctl(inode, NULL((void *) 0), SCSI_IOCTL_DOORLOCK0x5380, 0);
611 if (scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->host->hostt->usage_count)
612 (*scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].device->host->hostt->usage_count)++;
613
614 sr_photocd(inode);
615
616 /* If this device did not have media in the drive at boot time, then
617 * we would have been unable to get the sector size. Check to see if
618 * this is the case, and try again.
619 */
620
621 if(scsi_CDs[MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1))].needs_sector_size)
622 get_sectorsize(MINOR(inode->i_rdev)((inode->i_rdev) & ((1<<8) - 1)));
623
624 return 0;
625}
626
627
628/*
629 * do_sr_request() is the request handler function for the sr driver.
630 * Its function in life is to take block device requests, and
631 * translate them to SCSI commands.
632 */
633
634static void do_sr_request (void)
635{
636 Scsi_Cmnd * SCpnt = NULL((void *) 0);
637 struct request * req = NULL((void *) 0);
638 Scsi_Device * SDev;
639 unsigned long flags;
640 int flag = 0;
641
642 while (1==1){
643 save_flags(flags)__asm__ __volatile__("pushf ; pop %0" : "=r" (flags): :"memory"
);
644 cli()__asm__ __volatile__ ("cli": : :"memory");
645 if (CURRENT(blk_dev[11].current_request) != NULL((void *) 0) && CURRENT(blk_dev[11].current_request)->rq_status == RQ_INACTIVE(-1)) {
646 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
647 return;
648 };
649
650 INIT_SCSI_REQUESTif (!(blk_dev[11].current_request)) { (do_sr = (((void *) 0))
); __asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory"
); return; } if ((((blk_dev[11].current_request)->rq_dev) >>
8) != 11) panic("CD-ROM" ": request list destroyed"); if ((blk_dev
[11].current_request)->bh) { if (!buffer_locked((blk_dev[11
].current_request)->bh)) panic("CD-ROM" ": block not locked"
); };
651
652 SDev = scsi_CDs[DEVICE_NR(CURRENT->rq_dev)((((blk_dev[11].current_request)->rq_dev) & ((1<<
8) - 1)))].device;
653
654 /*
655 * I am not sure where the best place to do this is. We need
656 * to hook in a place where we are likely to come if in user
657 * space.
658 */
659 if( SDev->was_reset )
660 {
661 /*
662 * We need to relock the door, but we might
663 * be in an interrupt handler. Only do this
664 * from user space, since we do not want to
665 * sleep from an interrupt.
666 */
667 if( SDev->removable && !intr_count )
668 {
669 scsi_ioctl(SDev, SCSI_IOCTL_DOORLOCK0x5380, 0);
670 }
671 SDev->was_reset = 0;
672 }
673
674 if (flag++ == 0)
675 SCpnt = allocate_device(&CURRENT(blk_dev[11].current_request),
676 scsi_CDs[DEVICE_NR(CURRENT->rq_dev)((((blk_dev[11].current_request)->rq_dev) & ((1<<
8) - 1)))].device, 0);
677 else SCpnt = NULL((void *) 0);
678 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
679
680 /* This is a performance enhancement. We dig down into the request list and
681 * try to find a queueable request (i.e. device not busy, and host able to
682 * accept another command. If we find one, then we queue it. This can
683 * make a big difference on systems with more than one disk drive. We want
684 * to have the interrupts off when monkeying with the request list, because
685 * otherwise the kernel might try to slip in a request in between somewhere. */
686
687 if (!SCpnt && sr_template.nr_dev > 1){
688 struct request *req1;
689 req1 = NULL((void *) 0);
690 save_flags(flags)__asm__ __volatile__("pushf ; pop %0" : "=r" (flags): :"memory"
);
691 cli()__asm__ __volatile__ ("cli": : :"memory");
692 req = CURRENT(blk_dev[11].current_request);
693 while(req){
694 SCpnt = request_queueable(req,
695 scsi_CDs[DEVICE_NR(req->rq_dev)(((req->rq_dev) & ((1<<8) - 1)))].device);
696 if(SCpnt) break;
697 req1 = req;
698 req = req->next;
699 };
700 if (SCpnt && req->rq_status == RQ_INACTIVE(-1)) {
701 if (req == CURRENT(blk_dev[11].current_request))
702 CURRENT(blk_dev[11].current_request) = CURRENT(blk_dev[11].current_request)->next;
703 else
704 req1->next = req->next;
705 };
706 restore_flags(flags)__asm__ __volatile__("push %0 ; popf": :"g" (flags):"memory");
707 };
708
709 if (!SCpnt)
710 return; /* Could not find anything to do */
711
712 wake_up(&wait_for_request);
713
714 /* Queue command */
715 requeue_sr_request(SCpnt);
716 }; /* While */
717}
718
719void requeue_sr_request (Scsi_Cmnd * SCpnt)
720{
721 unsigned int dev, block, realcount;
722 unsigned char cmd[10], *buffer, tries;
723 int this_count, start, end_rec;
724
725 tries = 2;
726
727 repeat:
728 if(!SCpnt || SCpnt->request.rq_status == RQ_INACTIVE(-1)) {
729 do_sr_request();
730 return;
731 }
732
733 dev = MINOR(SCpnt->request.rq_dev)((SCpnt->request.rq_dev) & ((1<<8) - 1));
734 block = SCpnt->request.sector;
735 buffer = NULL((void *) 0);
736 this_count = 0;
737
738 if (dev >= sr_template.nr_dev) {
739 /* printk("CD-ROM request error: invalid device.\n"); */
740 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
741 tries = 2;
742 goto repeat;
743 }
744
745 if (!scsi_CDs[dev].use) {
746 /* printk("CD-ROM request error: device marked not in use.\n"); */
747 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
748 tries = 2;
749 goto repeat;
750 }
751
752 if (scsi_CDs[dev].device->changed) {
753 /*
754 * quietly refuse to do anything to a changed disc
755 * until the changed bit has been reset
756 */
757 /* printk("CD-ROM has been changed. Prohibiting further I/O.\n"); */
758 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
759 tries = 2;
760 goto repeat;
761 }
762
763 switch (SCpnt->request.cmd)
764 {
765 case WRITE1:
766 SCpnt = end_scsi_request(SCpnt, 0, SCpnt->request.nr_sectors);
767 goto repeat;
768 break;
769 case READ0 :
770 cmd[0] = READ_60x08;
771 break;
772 default :
773 panic ("Unknown sr command %d\n", SCpnt->request.cmd);
774 }
775
776 cmd[1] = (SCpnt->lun << 5) & 0xe0;
777
778 /*
779 * Now do the grungy work of figuring out which sectors we need, and
780 * where in memory we are going to put them.
781 *
782 * The variables we need are:
783 *
784 * this_count= number of 512 byte sectors being read
785 * block = starting cdrom sector to read.
786 * realcount = # of cdrom sectors to read
787 *
788 * The major difference between a scsi disk and a scsi cdrom
789 * is that we will always use scatter-gather if we can, because we can
790 * work around the fact that the buffer cache has a block size of 1024,
791 * and we have 2048 byte sectors. This code should work for buffers that
792 * are any multiple of 512 bytes long.
793 */
794
795 SCpnt->use_sg = 0;
796
797 if (SCpnt->host->sg_tablesize > 0 &&
798 (!need_isa_buffer ||
799 dma_free_sectors >= 10)) {
800 struct buffer_head * bh;
801 struct scatterlist * sgpnt;
802 int count, this_count_max;
803 bh = SCpnt->request.bh;
804 this_count = 0;
805 count = 0;
806 this_count_max = (scsi_CDs[dev].ten ? 0xffff : 0xff) << 4;
807 /* Calculate how many links we can use. First see if we need
808 * a padding record at the start */
809 this_count = SCpnt->request.sector % 4;
810 if(this_count) count++;
811 while(bh && count < SCpnt->host->sg_tablesize) {
812 if ((this_count + (bh->b_size >> 9)) > this_count_max) break;
813 this_count += (bh->b_size >> 9);
814 count++;
815 bh = bh->b_reqnext;
816 };
817 /* Fix up in case of an odd record at the end */
818 end_rec = 0;
819 if(this_count % 4) {
820 if (count < SCpnt->host->sg_tablesize) {
821 count++;
822 end_rec = (4 - (this_count % 4)) << 9;
823 this_count += 4 - (this_count % 4);
824 } else {
825 count--;
826 this_count -= (this_count % 4);
827 };
828 };
829 SCpnt->use_sg = count; /* Number of chains */
830 /* scsi_malloc can only allocate in chunks of 512 bytes */
831 count = (SCpnt->use_sg * sizeof(struct scatterlist) + 511) & ~511;
832
833 SCpnt->sglist_len = count;
834 sgpnt = (struct scatterlist * ) scsi_malloc(count);
835 if (!sgpnt) {
836 printk("Warning - running *really* short on DMA buffers\n");
837 SCpnt->use_sg = 0; /* No memory left - bail out */
838 } else {
839 buffer = (unsigned char *) sgpnt;
840 count = 0;
841 bh = SCpnt->request.bh;
842 if(SCpnt->request.sector % 4) {
843 sgpnt[count].length = (SCpnt->request.sector % 4) << 9;
844 sgpnt[count].address = (char *) scsi_malloc(sgpnt[count].length);
845 if(!sgpnt[count].address) panic("SCSI DMA pool exhausted.");
846 sgpnt[count].alt_address = sgpnt[count].address; /* Flag to delete
847 if needed */
848 count++;
849 };
850 for(bh = SCpnt->request.bh; count < SCpnt->use_sg;
851 count++, bh = bh->b_reqnext) {
852 if (bh) { /* Need a placeholder at the end of the record? */
853 sgpnt[count].address = bh->b_data;
854 sgpnt[count].length = bh->b_size;
855 sgpnt[count].alt_address = NULL((void *) 0);
856 } else {
857 sgpnt[count].address = (char *) scsi_malloc(end_rec);
858 if(!sgpnt[count].address) panic("SCSI DMA pool exhausted.");
859 sgpnt[count].length = end_rec;
860 sgpnt[count].alt_address = sgpnt[count].address;
861 if (count+1 != SCpnt->use_sg) panic("Bad sr request list");
862 break;
863 };
864 if (((long) sgpnt[count].address) + sgpnt[count].length - 1 >
865 ISA_DMA_THRESHOLD(0x00ffffff) && SCpnt->host->unchecked_isa_dma) {
866 sgpnt[count].alt_address = sgpnt[count].address;
867 /* We try to avoid exhausting the DMA pool, since it is easier
868 * to control usage here. In other places we might have a more
869 * pressing need, and we would be screwed if we ran out */
870 if(dma_free_sectors < (sgpnt[count].length >> 9) + 5) {
871 sgpnt[count].address = NULL((void *) 0);
872 } else {
873 sgpnt[count].address = (char *) scsi_malloc(sgpnt[count].length);
874 };
875 /* If we start running low on DMA buffers, we abort the scatter-gather
876 * operation, and free all of the memory we have allocated. We want to
877 * ensure that all scsi operations are able to do at least a non-scatter/gather
878 * operation */
879 if(sgpnt[count].address == NULL((void *) 0)){ /* Out of dma memory */
880 printk("Warning: Running low on SCSI DMA buffers");
881 /* Try switching back to a non scatter-gather operation. */
882 while(--count >= 0){
883 if(sgpnt[count].alt_address)
884 scsi_free(sgpnt[count].address, sgpnt[count].length);
885 };
886 SCpnt->use_sg = 0;
887 scsi_free(buffer, SCpnt->sglist_len);
888 break;
889 }; /* if address == NULL */
890 }; /* if need DMA fixup */
891 }; /* for loop to fill list */
892#ifdef DEBUG
893 printk("SR: %d %d %d %d %d *** ",SCpnt->use_sg, SCpnt->request.sector,
894 this_count,
895 SCpnt->request.current_nr_sectors,
896 SCpnt->request.nr_sectors);
897 for(count=0; count<SCpnt->use_sg; count++)
898 printk("SGlist: %d %x %x %x\n", count,
899 sgpnt[count].address,
900 sgpnt[count].alt_address,
901 sgpnt[count].length);
902#endif
903 }; /* Able to allocate scatter-gather list */
904 };
905
906 if (SCpnt->use_sg == 0){
907 /* We cannot use scatter-gather. Do this the old fashion way */
908 if (!SCpnt->request.bh)
909 this_count = SCpnt->request.nr_sectors;
910 else
911 this_count = (SCpnt->request.bh->b_size >> 9);
912
913 start = block % 4;
914 if (start)
915 {
916 this_count = ((this_count > 4 - start) ?
917 (4 - start) : (this_count));
918 buffer = (unsigned char *) scsi_malloc(2048);
919 }
920 else if (this_count < 4)
921 {
922 buffer = (unsigned char *) scsi_malloc(2048);
923 }
924 else
925 {
926 this_count -= this_count % 4;
927 buffer = (unsigned char *) SCpnt->request.buffer;
928 if (((long) buffer) + (this_count << 9) > ISA_DMA_THRESHOLD(0x00ffffff) &&
929 SCpnt->host->unchecked_isa_dma)
930 buffer = (unsigned char *) scsi_malloc(this_count << 9);
931 }
932 };
933
934 if (scsi_CDs[dev].sector_size == 2048)
935 block = block >> 2; /* These are the sectors that the cdrom uses */
936 else
937 block = block & 0xfffffffc;
938
939 realcount = (this_count + 3) / 4;
940
941 if (scsi_CDs[dev].sector_size == 512) realcount = realcount << 2;
942
943 if (((realcount > 0xff) || (block > 0x1fffff)) && scsi_CDs[dev].ten)
944 {
945 if (realcount > 0xffff)
946 {
947 realcount = 0xffff;
948 this_count = realcount * (scsi_CDs[dev].sector_size >> 9);
949 }
950
951 cmd[0] += READ_100x28 - READ_60x08 ;
952 cmd[2] = (unsigned char) (block >> 24) & 0xff;
953 cmd[3] = (unsigned char) (block >> 16) & 0xff;
954 cmd[4] = (unsigned char) (block >> 8) & 0xff;
955 cmd[5] = (unsigned char) block & 0xff;
956 cmd[6] = cmd[9] = 0;
957 cmd[7] = (unsigned char) (realcount >> 8) & 0xff;
958 cmd[8] = (unsigned char) realcount & 0xff;
959 }
960 else
961 {
962 if (realcount > 0xff)
963 {
964 realcount = 0xff;
965 this_count = realcount * (scsi_CDs[dev].sector_size >> 9);
966 }
967
968 cmd[1] |= (unsigned char) ((block >> 16) & 0x1f);
969 cmd[2] = (unsigned char) ((block >> 8) & 0xff);
970 cmd[3] = (unsigned char) block & 0xff;
971 cmd[4] = (unsigned char) realcount;
972 cmd[5] = 0;
973 }
974
975#ifdef DEBUG
976 {
977 int i;
978 printk("ReadCD: %d %d %d %d\n",block, realcount, buffer, this_count);
979 printk("Use sg: %d\n", SCpnt->use_sg);
980 printk("Dumping command: ");
981 for(i=0; i<12; i++) printk("%2.2x ", cmd[i]);
982 printk("\n");
983 };
984#endif
985
986 /* Some dumb host adapters can speed transfers by knowing the
987 * minimum transfersize in advance.
988 *
989 * We shouldn't disconnect in the middle of a sector, but the cdrom
990 * sector size can be larger than the size of a buffer and the
991 * transfer may be split to the size of a buffer. So it's safe to
992 * assume that we can at least transfer the minimum of the buffer
993 * size (1024) and the sector size between each connect / disconnect.
994 */
995
996 SCpnt->transfersize = (scsi_CDs[dev].sector_size > 1024) ?
997 1024 : scsi_CDs[dev].sector_size;
998
999 SCpnt->this_count = this_count;
1000 scsi_do_cmd (SCpnt, (void *) cmd, buffer,
1001 realcount * scsi_CDs[dev].sector_size,
1002 rw_intr, SR_TIMEOUT(30 * 100), MAX_RETRIES3);
1003}
1004
1005static int sr_detect(Scsi_Device * SDp){
1006
1007 if(SDp->type != TYPE_ROM0x05 && SDp->type != TYPE_WORM0x04) return 0;
1008
1009#ifdef MACH1
1010 printk("Detected scsi CD-ROM cd%d at scsi%d, channel %d, id %d, lun %d\n",
1011#else
1012 printk("Detected scsi CD-ROM sr%d at scsi%d, channel %d, id %d, lun %d\n",
1013#endif
1014 sr_template.dev_noticed++,
1015 SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
1016
1017 return 1;
1018}
1019
1020static int sr_attach(Scsi_Device * SDp){
1021 Scsi_CD * cpnt;
1022 int i;
1023
1024 if(SDp->type != TYPE_ROM0x05 && SDp->type != TYPE_WORM0x04) return 1;
1025
1026 if (sr_template.nr_dev >= sr_template.dev_max)
1027 {
1028 SDp->attached--;
1029 return 1;
1030 }
1031
1032 for(cpnt = scsi_CDs, i=0; i<sr_template.dev_max; i++, cpnt++)
1033 if(!cpnt->device) break;
1034
1035 if(i >= sr_template.dev_max) panic ("scsi_devices corrupt (sr)");
1036
1037 SDp->scsi_request_fn = do_sr_request;
1038 scsi_CDs[i].device = SDp;
1039 sr_template.nr_dev++;
1040 if(sr_template.nr_dev > sr_template.dev_max)
1041 panic ("scsi_devices corrupt (sr)");
1042 return 0;
1043}
1044
1045
1046static void sr_init_done (Scsi_Cmnd * SCpnt)
1047{
1048 struct request * req;
1049
1050 req = &SCpnt->request;
1051 req->rq_status = RQ_SCSI_DONE0xfffe; /* Busy, but indicate request done */
1052
1053 if (req->sem != NULL((void *) 0)) {
1054 up(req->sem);
1055 }
1056}
1057
1058void get_sectorsize(int i){
1059 unsigned char cmd[10];
1060 unsigned char *buffer;
1061 int the_result, retries;
1062 Scsi_Cmnd * SCpnt;
1063
1064 buffer = (unsigned char *) scsi_malloc(512);
1065 SCpnt = allocate_device(NULL((void *) 0), scsi_CDs[i].device, 1);
1066
1067 retries = 3;
1068 do {
1069 cmd[0] = READ_CAPACITY0x25;
1070 cmd[1] = (scsi_CDs[i].device->lun << 5) & 0xe0;
1071 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)))));
1072 SCpnt->request.rq_status = RQ_SCSI_BUSY0xffff; /* Mark as really busy */
1073 SCpnt->cmd_len = 0;
1074
1075 memset(buffer, 0, 8)(__builtin_constant_p(0) ? (__builtin_constant_p((8)) ? __constant_c_and_count_memset
(((buffer)),((0x01010101UL*(unsigned char)(0))),((8))) : __constant_c_memset
(((buffer)),((0x01010101UL*(unsigned char)(0))),((8)))) : (__builtin_constant_p
((8)) ? __memset_generic((((buffer))),(((0))),(((8)))) : __memset_generic
(((buffer)),((0)),((8)))));
1076
1077 /* Do the command and wait.. */
1078 {
1079 struct semaphore sem = MUTEX_LOCKED((struct semaphore) { 0, 0, 0, ((void *) 0) });
1080 SCpnt->request.sem = &sem;
1081 scsi_do_cmd (SCpnt,
1082 (void *) cmd, (void *) buffer,
1083 512, sr_init_done, SR_TIMEOUT(30 * 100),
1084 MAX_RETRIES3);
1085 down(&sem);
1086 }
1087
1088 the_result = SCpnt->result;
1089 retries--;
1090
1091 } while(the_result && retries);
1092
1093 SCpnt->request.rq_status = RQ_INACTIVE(-1); /* Mark as not busy */
1094
1095 wake_up(&SCpnt->device->device_wait);
1096
1097 if (the_result) {
1098 scsi_CDs[i].capacity = 0x1fffff;
1099 scsi_CDs[i].sector_size = 2048; /* A guess, just in case */
1100 scsi_CDs[i].needs_sector_size = 1;
1101 } else {
1102 scsi_CDs[i].capacity = 1 + ((buffer[0] << 24) |
1103 (buffer[1] << 16) |
1104 (buffer[2] << 8) |
1105 buffer[3]);
1106 scsi_CDs[i].sector_size = (buffer[4] << 24) |
1107 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1108 switch (scsi_CDs[i].sector_size) {
1109 /*
1110 * HP 4020i CD-Recorder reports 2340 byte sectors
1111 * Philips CD-Writers report 2352 byte sectors
1112 *
1113 * Use 2k sectors for them..
1114 */
1115 case 0: case 2340: case 2352:
1116 scsi_CDs[i].sector_size = 2048;
1117 /* fall through */
1118 case 2048:
1119 scsi_CDs[i].capacity *= 4;
1120 /* fall through */
1121 case 512:
1122 break;
1123 default:
1124#ifdef MACH1
1125 printk ("cd%d : unsupported sector size %d.\n",
1126 i, scsi_CDs[i].sector_size);
1127#else
1128 printk ("scd%d : unsupported sector size %d.\n",
1129 i, scsi_CDs[i].sector_size);
1130#endif
1131 scsi_CDs[i].capacity = 0;
1132 scsi_CDs[i].needs_sector_size = 1;
1133 }
1134 scsi_CDs[i].needs_sector_size = 0;
1135 sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS10 - 9);
1136 };
1137 scsi_free(buffer, 512);
1138}
1139
1140static int sr_registered = 0;
1141
1142static int sr_init()
1143{
1144 int i;
1145
1146 if(sr_template.dev_noticed == 0) return 0;
1147
1148 if(!sr_registered) {
1149 if (register_blkdev(MAJOR_NR11,"sr",&sr_fops)) {
1150 printk("Unable to get major %d for SCSI-CD\n",MAJOR_NR11);
1151 return 1;
1152 }
1153 sr_registered++;
1154 }
1155
1156
1157 if (scsi_CDs) return 0;
1158 sr_template.dev_max = sr_template.dev_noticed + SR_EXTRA_DEVS2;
1159 scsi_CDs = (Scsi_CD *) scsi_init_malloc(sr_template.dev_max * sizeof(Scsi_CD), GFP_ATOMIC0x01);
1160 memset(scsi_CDs, 0, sr_template.dev_max * sizeof(Scsi_CD))(__builtin_constant_p(0) ? (__builtin_constant_p((sr_template
.dev_max * sizeof(Scsi_CD))) ? __constant_c_and_count_memset(
((scsi_CDs)),((0x01010101UL*(unsigned char)(0))),((sr_template
.dev_max * sizeof(Scsi_CD)))) : __constant_c_memset(((scsi_CDs
)),((0x01010101UL*(unsigned char)(0))),((sr_template.dev_max *
sizeof(Scsi_CD))))) : (__builtin_constant_p((sr_template.dev_max
* sizeof(Scsi_CD))) ? __memset_generic((((scsi_CDs))),(((0))
),(((sr_template.dev_max * sizeof(Scsi_CD))))) : __memset_generic
(((scsi_CDs)),((0)),((sr_template.dev_max * sizeof(Scsi_CD)))
)));
1161
1162 sr_sizes = (int *) scsi_init_malloc(sr_template.dev_max * sizeof(int), GFP_ATOMIC0x01);
1163 memset(sr_sizes, 0, sr_template.dev_max * sizeof(int))(__builtin_constant_p(0) ? (__builtin_constant_p((sr_template
.dev_max * sizeof(int))) ? __constant_c_and_count_memset(((sr_sizes
)),((0x01010101UL*(unsigned char)(0))),((sr_template.dev_max *
sizeof(int)))) : __constant_c_memset(((sr_sizes)),((0x01010101UL
*(unsigned char)(0))),((sr_template.dev_max * sizeof(int)))))
: (__builtin_constant_p((sr_template.dev_max * sizeof(int)))
? __memset_generic((((sr_sizes))),(((0))),(((sr_template.dev_max
* sizeof(int))))) : __memset_generic(((sr_sizes)),((0)),((sr_template
.dev_max * sizeof(int))))));
1164
1165 sr_blocksizes = (int *) scsi_init_malloc(sr_template.dev_max *
1166 sizeof(int), GFP_ATOMIC0x01);
1167 for(i=0;i<sr_template.dev_max;i++) sr_blocksizes[i] = 2048;
1168 blksize_size[MAJOR_NR11] = sr_blocksizes;
1169 return 0;
1170}
1171
1172void sr_finish()
1173{
1174 int i;
1175
1176 blk_dev[MAJOR_NR11].request_fn = DEVICE_REQUESTdo_sr_request;
1177 blk_size[MAJOR_NR11] = sr_sizes;
1178
1179 for (i = 0; i < sr_template.nr_dev; ++i)
1180 {
1181 /* If we have already seen this, then skip it. Comes up
1182 * with loadable modules. */
1183 if (scsi_CDs[i].capacity) continue;
1184 scsi_CDs[i].capacity = 0x1fffff;
1185 scsi_CDs[i].sector_size = 2048; /* A guess, just in case */
1186 scsi_CDs[i].needs_sector_size = 1;
1187#if 0
1188 /* seems better to leave this for later */
1189 get_sectorsize(i);
1190 printk("Scd sectorsize = %d bytes.\n", scsi_CDs[i].sector_size);
1191#endif
1192 scsi_CDs[i].use = 1;
1193 scsi_CDs[i].ten = 1;
1194 scsi_CDs[i].remap = 1;
1195 scsi_CDs[i].auto_eject = 0; /* Default is not to eject upon unmount. */
1196 sr_sizes[i] = scsi_CDs[i].capacity >> (BLOCK_SIZE_BITS10 - 9);
1197 }
1198
1199
1200 /* If our host adapter is capable of scatter-gather, then we increase
1201 * the read-ahead to 16 blocks (32 sectors). If not, we use
1202 * a two block (4 sector) read ahead. */
1203 if(scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize)
1204 read_ahead[MAJOR_NR11] = 32; /* 32 sector read-ahead. Always removable. */
1205 else
1206 read_ahead[MAJOR_NR11] = 4; /* 4 sector read-ahead */
1207
1208 return;
1209}
1210
1211static void sr_detach(Scsi_Device * SDp)
1212{
1213 Scsi_CD * cpnt;
1214 int i;
1215
1216 for(cpnt = scsi_CDs, i=0; i<sr_template.dev_max; i++, cpnt++)
1217 if(cpnt->device == SDp) {
1218 kdev_t devi = MKDEV(MAJOR_NR, i)(((11) << 8) | (i));
1219
1220 /*
1221 * Since the cdrom is read-only, no need to sync the device.
1222 * We should be kind to our buffer cache, however.
1223 */
1224 invalidate_inodes(devi);
1225 invalidate_buffers(devi);
1226
1227 /*
1228 * Reset things back to a sane state so that one can re-load a new
1229 * driver (perhaps the same one).
1230 */
1231 cpnt->device = NULL((void *) 0);
1232 cpnt->capacity = 0;
1233 SDp->attached--;
1234 sr_template.nr_dev--;
1235 sr_template.dev_noticed--;
1236 sr_sizes[i] = 0;
1237 return;
1238 }
1239 return;
1240}
1241
1242
1243#ifdef MODULE
1244
1245int init_module(void) {
1246 sr_template.usage_count = &mod_use_count_;
1247 return scsi_register_module(MODULE_SCSI_DEV4, &sr_template);
1248}
1249
1250void cleanup_module( void)
1251{
1252 scsi_unregister_module(MODULE_SCSI_DEV4, &sr_template);
1253 unregister_blkdev(SCSI_CDROM_MAJOR11, "sr");
1254 sr_registered--;
1255 if(scsi_CDs != NULL((void *) 0)) {
1256 scsi_init_free((char *) scsi_CDs,
1257 (sr_template.dev_noticed + SR_EXTRA_DEVS2)
1258 * sizeof(Scsi_CD));
1259
1260 scsi_init_free((char *) sr_sizes, sr_template.dev_max * sizeof(int));
1261 scsi_init_free((char *) sr_blocksizes, sr_template.dev_max * sizeof(int));
1262 }
1263
1264 blksize_size[MAJOR_NR11] = NULL((void *) 0);
1265 blk_dev[MAJOR_NR11].request_fn = NULL((void *) 0);
1266 blk_size[MAJOR_NR11] = NULL((void *) 0);
1267 read_ahead[MAJOR_NR11] = 0;
1268
1269 sr_template.dev_max = 0;
1270}
1271#endif /* MODULE */
1272
1273/*
1274 * Overrides for Emacs so that we follow Linus's tabbing style.
1275 * Emacs will notice this stuff at the end of the file and automatically
1276 * adjust the settings for this buffer only. This must remain at the end
1277 * of the file.
1278 * ---------------------------------------------------------------------------
1279 * Local variables:
1280 * c-indent-level: 4
1281 * c-brace-imaginary-offset: 0
1282 * c-brace-offset: -4
1283 * c-argdecl-indent: 4
1284 * c-label-offset: -4
1285 * c-continued-statement-offset: 4
1286 * c-continued-brace-offset: 0
1287 * indent-tabs-mode: nil
1288 * tab-width: 8
1289 * End:
1290 */