projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Linux-2.6.12-rc2
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / block / pktcdvd.c
1 /*
2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
4 *
5 * May be copied or modified under the terms of the GNU General Public
6 * License. See linux/COPYING for more information.
7 *
8 * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
9 * DVD-RW devices (aka an exercise in block layer masturbation)
10 *
11 *
12 * TODO: (circa order of when I will fix it)
13 * - Only able to write on CD-RW media right now.
14 * - check host application code on media and set it in write page
15 * - interface for UDF <-> packet to negotiate a new location when a write
16 * fails.
17 * - handle OPC, especially for -RW media
18 *
19 * Theory of operation:
20 *
21 * We use a custom make_request_fn function that forwards reads directly to
22 * the underlying CD device. Write requests are either attached directly to
23 * a live packet_data object, or simply stored sequentially in a list for
24 * later processing by the kcdrwd kernel thread. This driver doesn't use
25 * any elevator functionally as defined by the elevator_s struct, but the
26 * underlying CD device uses a standard elevator.
27 *
28 * This strategy makes it possible to do very late merging of IO requests.
29 * A new bio sent to pkt_make_request can be merged with a live packet_data
30 * object even if the object is in the data gathering state.
31 *
32 *************************************************************************/
33
34 #define VERSION_CODE "v0.2.0a 2004-07-14 Jens Axboe (axboe@suse.de) and petero2@telia.com"
35
36 #include <linux/pktcdvd.h>
37 #include <linux/config.h>
38 #include <linux/module.h>
39 #include <linux/types.h>
40 #include <linux/kernel.h>
41 #include <linux/kthread.h>
42 #include <linux/errno.h>
43 #include <linux/spinlock.h>
44 #include <linux/file.h>
45 #include <linux/proc_fs.h>
46 #include <linux/seq_file.h>
47 #include <linux/miscdevice.h>
48 #include <linux/suspend.h>
49 #include <scsi/scsi_cmnd.h>
50 #include <scsi/scsi_ioctl.h>
51
52 #include <asm/uaccess.h>
53
54 #if PACKET_DEBUG
55 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
56 #else
57 #define DPRINTK(fmt, args...)
58 #endif
59
60 #if PACKET_DEBUG > 1
61 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
62 #else
63 #define VPRINTK(fmt, args...)
64 #endif
65
66 #define MAX_SPEED 0xffff
67
68 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
69
70 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
71 static struct proc_dir_entry *pkt_proc;
72 static int pkt_major;
73 static struct semaphore ctl_mutex; /* Serialize open/close/setup/teardown */
74 static mempool_t *psd_pool;
75
76
77 static void pkt_bio_finished(struct pktcdvd_device *pd)
78 {
79 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
80 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
81 VPRINTK("pktcdvd: queue empty\n");
82 atomic_set(&pd->iosched.attention, 1);
83 wake_up(&pd->wqueue);
84 }
85 }
86
87 static void pkt_bio_destructor(struct bio *bio)
88 {
89 kfree(bio->bi_io_vec);
90 kfree(bio);
91 }
92
93 static struct bio *pkt_bio_alloc(int nr_iovecs)
94 {
95 struct bio_vec *bvl = NULL;
96 struct bio *bio;
97
98 bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
99 if (!bio)
100 goto no_bio;
101 bio_init(bio);
102
103 bvl = kmalloc(nr_iovecs * sizeof(struct bio_vec), GFP_KERNEL);
104 if (!bvl)
105 goto no_bvl;
106 memset(bvl, 0, nr_iovecs * sizeof(struct bio_vec));
107
108 bio->bi_max_vecs = nr_iovecs;
109 bio->bi_io_vec = bvl;
110 bio->bi_destructor = pkt_bio_destructor;
111
112 return bio;
113
114 no_bvl:
115 kfree(bio);
116 no_bio:
117 return NULL;
118 }
119
120 /*
121 * Allocate a packet_data struct
122 */
123 static struct packet_data *pkt_alloc_packet_data(void)
124 {
125 int i;
126 struct packet_data *pkt;
127
128 pkt = kmalloc(sizeof(struct packet_data), GFP_KERNEL);
129 if (!pkt)
130 goto no_pkt;
131 memset(pkt, 0, sizeof(struct packet_data));
132
133 pkt->w_bio = pkt_bio_alloc(PACKET_MAX_SIZE);
134 if (!pkt->w_bio)
135 goto no_bio;
136
137 for (i = 0; i < PAGES_PER_PACKET; i++) {
138 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
139 if (!pkt->pages[i])
140 goto no_page;
141 }
142
143 spin_lock_init(&pkt->lock);
144
145 for (i = 0; i < PACKET_MAX_SIZE; i++) {
146 struct bio *bio = pkt_bio_alloc(1);
147 if (!bio)
148 goto no_rd_bio;
149 pkt->r_bios[i] = bio;
150 }
151
152 return pkt;
153
154 no_rd_bio:
155 for (i = 0; i < PACKET_MAX_SIZE; i++) {
156 struct bio *bio = pkt->r_bios[i];
157 if (bio)
158 bio_put(bio);
159 }
160
161 no_page:
162 for (i = 0; i < PAGES_PER_PACKET; i++)
163 if (pkt->pages[i])
164 __free_page(pkt->pages[i]);
165 bio_put(pkt->w_bio);
166 no_bio:
167 kfree(pkt);
168 no_pkt:
169 return NULL;
170 }
171
172 /*
173 * Free a packet_data struct
174 */
175 static void pkt_free_packet_data(struct packet_data *pkt)
176 {
177 int i;
178
179 for (i = 0; i < PACKET_MAX_SIZE; i++) {
180 struct bio *bio = pkt->r_bios[i];
181 if (bio)
182 bio_put(bio);
183 }
184 for (i = 0; i < PAGES_PER_PACKET; i++)
185 __free_page(pkt->pages[i]);
186 bio_put(pkt->w_bio);
187 kfree(pkt);
188 }
189
190 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
191 {
192 struct packet_data *pkt, *next;
193
194 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
195
196 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
197 pkt_free_packet_data(pkt);
198 }
199 }
200
201 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
202 {
203 struct packet_data *pkt;
204
205 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
206 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
207 spin_lock_init(&pd->cdrw.active_list_lock);
208 while (nr_packets > 0) {
209 pkt = pkt_alloc_packet_data();
210 if (!pkt) {
211 pkt_shrink_pktlist(pd);
212 return 0;
213 }
214 pkt->id = nr_packets;
215 pkt->pd = pd;
216 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
217 nr_packets--;
218 }
219 return 1;
220 }
221
222 static void *pkt_rb_alloc(unsigned int __nocast gfp_mask, void *data)
223 {
224 return kmalloc(sizeof(struct pkt_rb_node), gfp_mask);
225 }
226
227 static void pkt_rb_free(void *ptr, void *data)
228 {
229 kfree(ptr);
230 }
231
232 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
233 {
234 struct rb_node *n = rb_next(&node->rb_node);
235 if (!n)
236 return NULL;
237 return rb_entry(n, struct pkt_rb_node, rb_node);
238 }
239
240 static inline void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
241 {
242 rb_erase(&node->rb_node, &pd->bio_queue);
243 mempool_free(node, pd->rb_pool);
244 pd->bio_queue_size--;
245 BUG_ON(pd->bio_queue_size < 0);
246 }
247
248 /*
249 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
250 */
251 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
252 {
253 struct rb_node *n = pd->bio_queue.rb_node;
254 struct rb_node *next;
255 struct pkt_rb_node *tmp;
256
257 if (!n) {
258 BUG_ON(pd->bio_queue_size > 0);
259 return NULL;
260 }
261
262 for (;;) {
263 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
264 if (s <= tmp->bio->bi_sector)
265 next = n->rb_left;
266 else
267 next = n->rb_right;
268 if (!next)
269 break;
270 n = next;
271 }
272
273 if (s > tmp->bio->bi_sector) {
274 tmp = pkt_rbtree_next(tmp);
275 if (!tmp)
276 return NULL;
277 }
278 BUG_ON(s > tmp->bio->bi_sector);
279 return tmp;
280 }
281
282 /*
283 * Insert a node into the pd->bio_queue rb tree.
284 */
285 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
286 {
287 struct rb_node **p = &pd->bio_queue.rb_node;
288 struct rb_node *parent = NULL;
289 sector_t s = node->bio->bi_sector;
290 struct pkt_rb_node *tmp;
291
292 while (*p) {
293 parent = *p;
294 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
295 if (s < tmp->bio->bi_sector)
296 p = &(*p)->rb_left;
297 else
298 p = &(*p)->rb_right;
299 }
300 rb_link_node(&node->rb_node, parent, p);
301 rb_insert_color(&node->rb_node, &pd->bio_queue);
302 pd->bio_queue_size++;
303 }
304
305 /*
306 * Add a bio to a single linked list defined by its head and tail pointers.
307 */
308 static inline void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
309 {
310 bio->bi_next = NULL;
311 if (*list_tail) {
312 BUG_ON((*list_head) == NULL);
313 (*list_tail)->bi_next = bio;
314 (*list_tail) = bio;
315 } else {
316 BUG_ON((*list_head) != NULL);
317 (*list_head) = bio;
318 (*list_tail) = bio;
319 }
320 }
321
322 /*
323 * Remove and return the first bio from a single linked list defined by its
324 * head and tail pointers.
325 */
326 static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
327 {
328 struct bio *bio;
329
330 if (*list_head == NULL)
331 return NULL;
332
333 bio = *list_head;
334 *list_head = bio->bi_next;
335 if (*list_head == NULL)
336 *list_tail = NULL;
337
338 bio->bi_next = NULL;
339 return bio;
340 }
341
342 /*
343 * Send a packet_command to the underlying block device and
344 * wait for completion.
345 */
346 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
347 {
348 char sense[SCSI_SENSE_BUFFERSIZE];
349 request_queue_t *q;
350 struct request *rq;
351 DECLARE_COMPLETION(wait);
352 int err = 0;
353
354 q = bdev_get_queue(pd->bdev);
355
356 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ,
357 __GFP_WAIT);
358 rq->errors = 0;
359 rq->rq_disk = pd->bdev->bd_disk;
360 rq->bio = NULL;
361 rq->buffer = NULL;
362 rq->timeout = 60*HZ;
363 rq->data = cgc->buffer;
364 rq->data_len = cgc->buflen;
365 rq->sense = sense;
366 memset(sense, 0, sizeof(sense));
367 rq->sense_len = 0;
368 rq->flags |= REQ_BLOCK_PC | REQ_HARDBARRIER;
369 if (cgc->quiet)
370 rq->flags |= REQ_QUIET;
371 memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
372 if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
373 memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
374
375 rq->ref_count++;
376 rq->flags |= REQ_NOMERGE;
377 rq->waiting = &wait;
378 rq->end_io = blk_end_sync_rq;
379 elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);
380 generic_unplug_device(q);
381 wait_for_completion(&wait);
382
383 if (rq->errors)
384 err = -EIO;
385
386 blk_put_request(rq);
387 return err;
388 }
389
390 /*
391 * A generic sense dump / resolve mechanism should be implemented across
392 * all ATAPI + SCSI devices.
393 */
394 static void pkt_dump_sense(struct packet_command *cgc)
395 {
396 static char *info[9] = { "No sense", "Recovered error", "Not ready",
397 "Medium error", "Hardware error", "Illegal request",
398 "Unit attention", "Data protect", "Blank check" };
399 int i;
400 struct request_sense *sense = cgc->sense;
401
402 printk("pktcdvd:");
403 for (i = 0; i < CDROM_PACKET_SIZE; i++)
404 printk(" %02x", cgc->cmd[i]);
405 printk(" - ");
406
407 if (sense == NULL) {
408 printk("no sense\n");
409 return;
410 }
411
412 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
413
414 if (sense->sense_key > 8) {
415 printk(" (INVALID)\n");
416 return;
417 }
418
419 printk(" (%s)\n", info[sense->sense_key]);
420 }
421
422 /*
423 * flush the drive cache to media
424 */
425 static int pkt_flush_cache(struct pktcdvd_device *pd)
426 {
427 struct packet_command cgc;
428
429 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
430 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
431 cgc.quiet = 1;
432
433 /*
434 * the IMMED bit -- we default to not setting it, although that
435 * would allow a much faster close, this is safer
436 */
437 #if 0
438 cgc.cmd[1] = 1 << 1;
439 #endif
440 return pkt_generic_packet(pd, &cgc);
441 }
442
443 /*
444 * speed is given as the normal factor, e.g. 4 for 4x
445 */
446 static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed)
447 {
448 struct packet_command cgc;
449 struct request_sense sense;
450 int ret;
451
452 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
453 cgc.sense = &sense;
454 cgc.cmd[0] = GPCMD_SET_SPEED;
455 cgc.cmd[2] = (read_speed >> 8) & 0xff;
456 cgc.cmd[3] = read_speed & 0xff;
457 cgc.cmd[4] = (write_speed >> 8) & 0xff;
458 cgc.cmd[5] = write_speed & 0xff;
459
460 if ((ret = pkt_generic_packet(pd, &cgc)))
461 pkt_dump_sense(&cgc);
462
463 return ret;
464 }
465
466 /*
467 * Queue a bio for processing by the low-level CD device. Must be called
468 * from process context.
469 */
470 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio, int high_prio_read)
471 {
472 spin_lock(&pd->iosched.lock);
473 if (bio_data_dir(bio) == READ) {
474 pkt_add_list_last(bio, &pd->iosched.read_queue,
475 &pd->iosched.read_queue_tail);
476 if (high_prio_read)
477 pd->iosched.high_prio_read = 1;
478 } else {
479 pkt_add_list_last(bio, &pd->iosched.write_queue,
480 &pd->iosched.write_queue_tail);
481 }
482 spin_unlock(&pd->iosched.lock);
483
484 atomic_set(&pd->iosched.attention, 1);
485 wake_up(&pd->wqueue);
486 }
487
488 /*
489 * Process the queued read/write requests. This function handles special
490 * requirements for CDRW drives:
491 * - A cache flush command must be inserted before a read request if the
492 * previous request was a write.
493 * - Switching between reading and writing is slow, so don't it more often
494 * than necessary.
495 * - Set the read speed according to current usage pattern. When only reading
496 * from the device, it's best to use the highest possible read speed, but
497 * when switching often between reading and writing, it's better to have the
498 * same read and write speeds.
499 * - Reads originating from user space should have higher priority than reads
500 * originating from pkt_gather_data, because some process is usually waiting
501 * on reads of the first kind.
502 */
503 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
504 {
505 request_queue_t *q;
506
507 if (atomic_read(&pd->iosched.attention) == 0)
508 return;
509 atomic_set(&pd->iosched.attention, 0);
510
511 q = bdev_get_queue(pd->bdev);
512
513 for (;;) {
514 struct bio *bio;
515 int reads_queued, writes_queued, high_prio_read;
516
517 spin_lock(&pd->iosched.lock);
518 reads_queued = (pd->iosched.read_queue != NULL);
519 writes_queued = (pd->iosched.write_queue != NULL);
520 if (!reads_queued)
521 pd->iosched.high_prio_read = 0;
522 high_prio_read = pd->iosched.high_prio_read;
523 spin_unlock(&pd->iosched.lock);
524
525 if (!reads_queued && !writes_queued)
526 break;
527
528 if (pd->iosched.writing) {
529 if (high_prio_read || (!writes_queued && reads_queued)) {
530 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
531 VPRINTK("pktcdvd: write, waiting\n");
532 break;
533 }
534 pkt_flush_cache(pd);
535 pd->iosched.writing = 0;
536 }
537 } else {
538 if (!reads_queued && writes_queued) {
539 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
540 VPRINTK("pktcdvd: read, waiting\n");
541 break;
542 }
543 pd->iosched.writing = 1;
544 }
545 }
546
547 spin_lock(&pd->iosched.lock);
548 if (pd->iosched.writing) {
549 bio = pkt_get_list_first(&pd->iosched.write_queue,
550 &pd->iosched.write_queue_tail);
551 } else {
552 bio = pkt_get_list_first(&pd->iosched.read_queue,
553 &pd->iosched.read_queue_tail);
554 }
555 spin_unlock(&pd->iosched.lock);
556
557 if (!bio)
558 continue;
559
560 if (bio_data_dir(bio) == READ)
561 pd->iosched.successive_reads += bio->bi_size >> 10;
562 else
563 pd->iosched.successive_reads = 0;
564 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
565 if (pd->read_speed == pd->write_speed) {
566 pd->read_speed = MAX_SPEED;
567 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
568 }
569 } else {
570 if (pd->read_speed != pd->write_speed) {
571 pd->read_speed = pd->write_speed;
572 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
573 }
574 }
575
576 atomic_inc(&pd->cdrw.pending_bios);
577 generic_make_request(bio);
578 }
579 }
580
581 /*
582 * Special care is needed if the underlying block device has a small
583 * max_phys_segments value.
584 */
585 static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q)
586 {
587 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
588 /*
589 * The cdrom device can handle one segment/frame
590 */
591 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
592 return 0;
593 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
594 /*
595 * We can handle this case at the expense of some extra memory
596 * copies during write operations
597 */
598 set_bit(PACKET_MERGE_SEGS, &pd->flags);
599 return 0;
600 } else {
601 printk("pktcdvd: cdrom max_phys_segments too small\n");
602 return -EIO;
603 }
604 }
605
606 /*
607 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
608 */
609 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
610 {
611 unsigned int copy_size = CD_FRAMESIZE;
612
613 while (copy_size > 0) {
614 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
615 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
616 src_bvl->bv_offset + offs;
617 void *vto = page_address(dst_page) + dst_offs;
618 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
619
620 BUG_ON(len < 0);
621 memcpy(vto, vfrom, len);
622 kunmap_atomic(vfrom, KM_USER0);
623
624 seg++;
625 offs = 0;
626 dst_offs += len;
627 copy_size -= len;
628 }
629 }
630
631 /*
632 * Copy all data for this packet to pkt->pages[], so that
633 * a) The number of required segments for the write bio is minimized, which
634 * is necessary for some scsi controllers.
635 * b) The data can be used as cache to avoid read requests if we receive a
636 * new write request for the same zone.
637 */
638 static void pkt_make_local_copy(struct packet_data *pkt, struct page **pages, int *offsets)
639 {
640 int f, p, offs;
641
642 /* Copy all data to pkt->pages[] */
643 p = 0;
644 offs = 0;
645 for (f = 0; f < pkt->frames; f++) {
646 if (pages[f] != pkt->pages[p]) {
647 void *vfrom = kmap_atomic(pages[f], KM_USER0) + offsets[f];
648 void *vto = page_address(pkt->pages[p]) + offs;
649 memcpy(vto, vfrom, CD_FRAMESIZE);
650 kunmap_atomic(vfrom, KM_USER0);
651 pages[f] = pkt->pages[p];
652 offsets[f] = offs;
653 } else {
654 BUG_ON(offsets[f] != offs);
655 }
656 offs += CD_FRAMESIZE;
657 if (offs >= PAGE_SIZE) {
658 BUG_ON(offs > PAGE_SIZE);
659 offs = 0;
660 p++;
661 }
662 }
663 }
664
665 static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
666 {
667 struct packet_data *pkt = bio->bi_private;
668 struct pktcdvd_device *pd = pkt->pd;
669 BUG_ON(!pd);
670
671 if (bio->bi_size)
672 return 1;
673
674 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
675 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
676
677 if (err)
678 atomic_inc(&pkt->io_errors);
679 if (atomic_dec_and_test(&pkt->io_wait)) {
680 atomic_inc(&pkt->run_sm);
681 wake_up(&pd->wqueue);
682 }
683 pkt_bio_finished(pd);
684
685 return 0;
686 }
687
688 static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err)
689 {
690 struct packet_data *pkt = bio->bi_private;
691 struct pktcdvd_device *pd = pkt->pd;
692 BUG_ON(!pd);
693
694 if (bio->bi_size)
695 return 1;
696
697 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
698
699 pd->stats.pkt_ended++;
700
701 pkt_bio_finished(pd);
702 atomic_dec(&pkt->io_wait);
703 atomic_inc(&pkt->run_sm);
704 wake_up(&pd->wqueue);
705 return 0;
706 }
707
708 /*
709 * Schedule reads for the holes in a packet
710 */
711 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
712 {
713 int frames_read = 0;
714 struct bio *bio;
715 int f;
716 char written[PACKET_MAX_SIZE];
717
718 BUG_ON(!pkt->orig_bios);
719
720 atomic_set(&pkt->io_wait, 0);
721 atomic_set(&pkt->io_errors, 0);
722
723 if (pkt->cache_valid) {
724 VPRINTK("pkt_gather_data: zone %llx cached\n",
725 (unsigned long long)pkt->sector);
726 goto out_account;
727 }
728
729 /*
730 * Figure out which frames we need to read before we can write.
731 */
732 memset(written, 0, sizeof(written));
733 spin_lock(&pkt->lock);
734 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
735 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
736 int num_frames = bio->bi_size / CD_FRAMESIZE;
737 BUG_ON(first_frame < 0);
738 BUG_ON(first_frame + num_frames > pkt->frames);
739 for (f = first_frame; f < first_frame + num_frames; f++)
740 written[f] = 1;
741 }
742 spin_unlock(&pkt->lock);
743
744 /*
745 * Schedule reads for missing parts of the packet.
746 */
747 for (f = 0; f < pkt->frames; f++) {
748 int p, offset;
749 if (written[f])
750 continue;
751 bio = pkt->r_bios[f];
752 bio_init(bio);
753 bio->bi_max_vecs = 1;
754 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
755 bio->bi_bdev = pd->bdev;
756 bio->bi_end_io = pkt_end_io_read;
757 bio->bi_private = pkt;
758
759 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
760 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
761 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
762 f, pkt->pages[p], offset);
763 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
764 BUG();
765
766 atomic_inc(&pkt->io_wait);
767 bio->bi_rw = READ;
768 pkt_queue_bio(pd, bio, 0);
769 frames_read++;
770 }
771
772 out_account:
773 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
774 frames_read, (unsigned long long)pkt->sector);
775 pd->stats.pkt_started++;
776 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
777 pd->stats.secs_w += pd->settings.size;
778 }
779
780 /*
781 * Find a packet matching zone, or the least recently used packet if
782 * there is no match.
783 */
784 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
785 {
786 struct packet_data *pkt;
787
788 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
789 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
790 list_del_init(&pkt->list);
791 if (pkt->sector != zone)
792 pkt->cache_valid = 0;
793 break;
794 }
795 }
796 return pkt;
797 }
798
799 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
800 {
801 if (pkt->cache_valid) {
802 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
803 } else {
804 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
805 }
806 }
807
808 /*
809 * recover a failed write, query for relocation if possible
810 *
811 * returns 1 if recovery is possible, or 0 if not
812 *
813 */
814 static int pkt_start_recovery(struct packet_data *pkt)
815 {
816 /*
817 * FIXME. We need help from the file system to implement
818 * recovery handling.
819 */
820 return 0;
821 #if 0
822 struct request *rq = pkt->rq;
823 struct pktcdvd_device *pd = rq->rq_disk->private_data;
824 struct block_device *pkt_bdev;
825 struct super_block *sb = NULL;
826 unsigned long old_block, new_block;
827 sector_t new_sector;
828
829 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
830 if (pkt_bdev) {
831 sb = get_super(pkt_bdev);
832 bdput(pkt_bdev);
833 }
834
835 if (!sb)
836 return 0;
837
838 if (!sb->s_op || !sb->s_op->relocate_blocks)
839 goto out;
840
841 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
842 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
843 goto out;
844
845 new_sector = new_block * (CD_FRAMESIZE >> 9);
846 pkt->sector = new_sector;
847
848 pkt->bio->bi_sector = new_sector;
849 pkt->bio->bi_next = NULL;
850 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
851 pkt->bio->bi_idx = 0;
852
853 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
854 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
855 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
856 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
857 BUG_ON(pkt->bio->bi_private != pkt);
858
859 drop_super(sb);
860 return 1;
861
862 out:
863 drop_super(sb);
864 return 0;
865 #endif
866 }
867
868 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
869 {
870 #if PACKET_DEBUG > 1
871 static const char *state_name[] = {
872 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
873 };
874 enum packet_data_state old_state = pkt->state;
875 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
876 state_name[old_state], state_name[state]);
877 #endif
878 pkt->state = state;
879 }
880
881 /*
882 * Scan the work queue to see if we can start a new packet.
883 * returns non-zero if any work was done.
884 */
885 static int pkt_handle_queue(struct pktcdvd_device *pd)
886 {
887 struct packet_data *pkt, *p;
888 struct bio *bio = NULL;
889 sector_t zone = 0; /* Suppress gcc warning */
890 struct pkt_rb_node *node, *first_node;
891 struct rb_node *n;
892
893 VPRINTK("handle_queue\n");
894
895 atomic_set(&pd->scan_queue, 0);
896
897 if (list_empty(&pd->cdrw.pkt_free_list)) {
898 VPRINTK("handle_queue: no pkt\n");
899 return 0;
900 }
901
902 /*
903 * Try to find a zone we are not already working on.
904 */
905 spin_lock(&pd->lock);
906 first_node = pkt_rbtree_find(pd, pd->current_sector);
907 if (!first_node) {
908 n = rb_first(&pd->bio_queue);
909 if (n)
910 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
911 }
912 node = first_node;
913 while (node) {
914 bio = node->bio;
915 zone = ZONE(bio->bi_sector, pd);
916 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
917 if (p->sector == zone)
918 goto try_next_bio;
919 }
920 break;
921 try_next_bio:
922 node = pkt_rbtree_next(node);
923 if (!node) {
924 n = rb_first(&pd->bio_queue);
925 if (n)
926 node = rb_entry(n, struct pkt_rb_node, rb_node);
927 }
928 if (node == first_node)
929 node = NULL;
930 }
931 spin_unlock(&pd->lock);
932 if (!bio) {
933 VPRINTK("handle_queue: no bio\n");
934 return 0;
935 }
936
937 pkt = pkt_get_packet_data(pd, zone);
938 BUG_ON(!pkt);
939
940 pd->current_sector = zone + pd->settings.size;
941 pkt->sector = zone;
942 pkt->frames = pd->settings.size >> 2;
943 BUG_ON(pkt->frames > PACKET_MAX_SIZE);
944 pkt->write_size = 0;
945
946 /*
947 * Scan work queue for bios in the same zone and link them
948 * to this packet.
949 */
950 spin_lock(&pd->lock);
951 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
952 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
953 bio = node->bio;
954 VPRINTK("pkt_handle_queue: found zone=%llx\n",
955 (unsigned long long)ZONE(bio->bi_sector, pd));
956 if (ZONE(bio->bi_sector, pd) != zone)
957 break;
958 pkt_rbtree_erase(pd, node);
959 spin_lock(&pkt->lock);
960 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
961 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
962 spin_unlock(&pkt->lock);
963 }
964 spin_unlock(&pd->lock);
965
966 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
967 pkt_set_state(pkt, PACKET_WAITING_STATE);
968 atomic_set(&pkt->run_sm, 1);
969
970 spin_lock(&pd->cdrw.active_list_lock);
971 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
972 spin_unlock(&pd->cdrw.active_list_lock);
973
974 return 1;
975 }
976
977 /*
978 * Assemble a bio to write one packet and queue the bio for processing
979 * by the underlying block device.
980 */
981 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
982 {
983 struct bio *bio;
984 struct page *pages[PACKET_MAX_SIZE];
985 int offsets[PACKET_MAX_SIZE];
986 int f;
987 int frames_write;
988
989 for (f = 0; f < pkt->frames; f++) {
990 pages[f] = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
991 offsets[f] = (f * CD_FRAMESIZE) % PAGE_SIZE;
992 }
993
994 /*
995 * Fill-in pages[] and offsets[] with data from orig_bios.
996 */
997 frames_write = 0;
998 spin_lock(&pkt->lock);
999 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1000 int segment = bio->bi_idx;
1001 int src_offs = 0;
1002 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1003 int num_frames = bio->bi_size / CD_FRAMESIZE;
1004 BUG_ON(first_frame < 0);
1005 BUG_ON(first_frame + num_frames > pkt->frames);
1006 for (f = first_frame; f < first_frame + num_frames; f++) {
1007 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1008
1009 while (src_offs >= src_bvl->bv_len) {
1010 src_offs -= src_bvl->bv_len;
1011 segment++;
1012 BUG_ON(segment >= bio->bi_vcnt);
1013 src_bvl = bio_iovec_idx(bio, segment);
1014 }
1015
1016 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1017 pages[f] = src_bvl->bv_page;
1018 offsets[f] = src_bvl->bv_offset + src_offs;
1019 } else {
1020 pkt_copy_bio_data(bio, segment, src_offs,
1021 pages[f], offsets[f]);
1022 }
1023 src_offs += CD_FRAMESIZE;
1024 frames_write++;
1025 }
1026 }
1027 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1028 spin_unlock(&pkt->lock);
1029
1030 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1031 frames_write, (unsigned long long)pkt->sector);
1032 BUG_ON(frames_write != pkt->write_size);
1033
1034 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1035 pkt_make_local_copy(pkt, pages, offsets);
1036 pkt->cache_valid = 1;
1037 } else {
1038 pkt->cache_valid = 0;
1039 }
1040
1041 /* Start the write request */
1042 bio_init(pkt->w_bio);
1043 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1044 pkt->w_bio->bi_sector = pkt->sector;
1045 pkt->w_bio->bi_bdev = pd->bdev;
1046 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1047 pkt->w_bio->bi_private = pkt;
1048 for (f = 0; f < pkt->frames; f++) {
1049 if ((f + 1 < pkt->frames) && (pages[f + 1] == pages[f]) &&
1050 (offsets[f + 1] = offsets[f] + CD_FRAMESIZE)) {
1051 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE * 2, offsets[f]))
1052 BUG();
1053 f++;
1054 } else {
1055 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE, offsets[f]))
1056 BUG();
1057 }
1058 }
1059 VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt);
1060
1061 atomic_set(&pkt->io_wait, 1);
1062 pkt->w_bio->bi_rw = WRITE;
1063 pkt_queue_bio(pd, pkt->w_bio, 0);
1064 }
1065
1066 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1067 {
1068 struct bio *bio, *next;
1069
1070 if (!uptodate)
1071 pkt->cache_valid = 0;
1072
1073 /* Finish all bios corresponding to this packet */
1074 bio = pkt->orig_bios;
1075 while (bio) {
1076 next = bio->bi_next;
1077 bio->bi_next = NULL;
1078 bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
1079 bio = next;
1080 }
1081 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1082 }
1083
1084 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1085 {
1086 int uptodate;
1087
1088 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1089
1090 for (;;) {
1091 switch (pkt->state) {
1092 case PACKET_WAITING_STATE:
1093 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1094 return;
1095
1096 pkt->sleep_time = 0;
1097 pkt_gather_data(pd, pkt);
1098 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1099 break;
1100
1101 case PACKET_READ_WAIT_STATE:
1102 if (atomic_read(&pkt->io_wait) > 0)
1103 return;
1104
1105 if (atomic_read(&pkt->io_errors) > 0) {
1106 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1107 } else {
1108 pkt_start_write(pd, pkt);
1109 }
1110 break;
1111
1112 case PACKET_WRITE_WAIT_STATE:
1113 if (atomic_read(&pkt->io_wait) > 0)
1114 return;
1115
1116 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1117 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1118 } else {
1119 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1120 }
1121 break;
1122
1123 case PACKET_RECOVERY_STATE:
1124 if (pkt_start_recovery(pkt)) {
1125 pkt_start_write(pd, pkt);
1126 } else {
1127 VPRINTK("No recovery possible\n");
1128 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1129 }
1130 break;
1131
1132 case PACKET_FINISHED_STATE:
1133 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1134 pkt_finish_packet(pkt, uptodate);
1135 return;
1136
1137 default:
1138 BUG();
1139 break;
1140 }
1141 }
1142 }
1143
1144 static void pkt_handle_packets(struct pktcdvd_device *pd)
1145 {
1146 struct packet_data *pkt, *next;
1147
1148 VPRINTK("pkt_handle_packets\n");
1149
1150 /*
1151 * Run state machine for active packets
1152 */
1153 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1154 if (atomic_read(&pkt->run_sm) > 0) {
1155 atomic_set(&pkt->run_sm, 0);
1156 pkt_run_state_machine(pd, pkt);
1157 }
1158 }
1159
1160 /*
1161 * Move no longer active packets to the free list
1162 */
1163 spin_lock(&pd->cdrw.active_list_lock);
1164 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1165 if (pkt->state == PACKET_FINISHED_STATE) {
1166 list_del(&pkt->list);
1167 pkt_put_packet_data(pd, pkt);
1168 pkt_set_state(pkt, PACKET_IDLE_STATE);
1169 atomic_set(&pd->scan_queue, 1);
1170 }
1171 }
1172 spin_unlock(&pd->cdrw.active_list_lock);
1173 }
1174
1175 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1176 {
1177 struct packet_data *pkt;
1178 int i;
1179
1180 for (i = 0; i <= PACKET_NUM_STATES; i++)
1181 states[i] = 0;
1182
1183 spin_lock(&pd->cdrw.active_list_lock);
1184 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1185 states[pkt->state]++;
1186 }
1187 spin_unlock(&pd->cdrw.active_list_lock);
1188 }
1189
1190 /*
1191 * kcdrwd is woken up when writes have been queued for one of our
1192 * registered devices
1193 */
1194 static int kcdrwd(void *foobar)
1195 {
1196 struct pktcdvd_device *pd = foobar;
1197 struct packet_data *pkt;
1198 long min_sleep_time, residue;
1199
1200 set_user_nice(current, -20);
1201
1202 for (;;) {
1203 DECLARE_WAITQUEUE(wait, current);
1204
1205 /*
1206 * Wait until there is something to do
1207 */
1208 add_wait_queue(&pd->wqueue, &wait);
1209 for (;;) {
1210 set_current_state(TASK_INTERRUPTIBLE);
1211
1212 /* Check if we need to run pkt_handle_queue */
1213 if (atomic_read(&pd->scan_queue) > 0)
1214 goto work_to_do;
1215
1216 /* Check if we need to run the state machine for some packet */
1217 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1218 if (atomic_read(&pkt->run_sm) > 0)
1219 goto work_to_do;
1220 }
1221
1222 /* Check if we need to process the iosched queues */
1223 if (atomic_read(&pd->iosched.attention) != 0)
1224 goto work_to_do;
1225
1226 /* Otherwise, go to sleep */
1227 if (PACKET_DEBUG > 1) {
1228 int states[PACKET_NUM_STATES];
1229 pkt_count_states(pd, states);
1230 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1231 states[0], states[1], states[2], states[3],
1232 states[4], states[5]);
1233 }
1234
1235 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1236 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1237 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1238 min_sleep_time = pkt->sleep_time;
1239 }
1240
1241 generic_unplug_device(bdev_get_queue(pd->bdev));
1242
1243 VPRINTK("kcdrwd: sleeping\n");
1244 residue = schedule_timeout(min_sleep_time);
1245 VPRINTK("kcdrwd: wake up\n");
1246
1247 /* make swsusp happy with our thread */
1248 if (current->flags & PF_FREEZE)
1249 refrigerator(PF_FREEZE);
1250
1251 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1252 if (!pkt->sleep_time)
1253 continue;
1254 pkt->sleep_time -= min_sleep_time - residue;
1255 if (pkt->sleep_time <= 0) {
1256 pkt->sleep_time = 0;
1257 atomic_inc(&pkt->run_sm);
1258 }
1259 }
1260
1261 if (signal_pending(current)) {
1262 flush_signals(current);
1263 }
1264 if (kthread_should_stop())
1265 break;
1266 }
1267 work_to_do:
1268 set_current_state(TASK_RUNNING);
1269 remove_wait_queue(&pd->wqueue, &wait);
1270
1271 if (kthread_should_stop())
1272 break;
1273
1274 /*
1275 * if pkt_handle_queue returns true, we can queue
1276 * another request.
1277 */
1278 while (pkt_handle_queue(pd))
1279 ;
1280
1281 /*
1282 * Handle packet state machine
1283 */
1284 pkt_handle_packets(pd);
1285
1286 /*
1287 * Handle iosched queues
1288 */
1289 pkt_iosched_process_queue(pd);
1290 }
1291
1292 return 0;
1293 }
1294
1295 static void pkt_print_settings(struct pktcdvd_device *pd)
1296 {
1297 printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1298 printk("%u blocks, ", pd->settings.size >> 2);
1299 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1300 }
1301
1302 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1303 {
1304 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1305
1306 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1307 cgc->cmd[2] = page_code | (page_control << 6);
1308 cgc->cmd[7] = cgc->buflen >> 8;
1309 cgc->cmd[8] = cgc->buflen & 0xff;
1310 cgc->data_direction = CGC_DATA_READ;
1311 return pkt_generic_packet(pd, cgc);
1312 }
1313
1314 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1315 {
1316 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1317 memset(cgc->buffer, 0, 2);
1318 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1319 cgc->cmd[1] = 0x10; /* PF */
1320 cgc->cmd[7] = cgc->buflen >> 8;
1321 cgc->cmd[8] = cgc->buflen & 0xff;
1322 cgc->data_direction = CGC_DATA_WRITE;
1323 return pkt_generic_packet(pd, cgc);
1324 }
1325
1326 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1327 {
1328 struct packet_command cgc;
1329 int ret;
1330
1331 /* set up command and get the disc info */
1332 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1333 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1334 cgc.cmd[8] = cgc.buflen = 2;
1335 cgc.quiet = 1;
1336
1337 if ((ret = pkt_generic_packet(pd, &cgc)))
1338 return ret;
1339
1340 /* not all drives have the same disc_info length, so requeue
1341 * packet with the length the drive tells us it can supply
1342 */
1343 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1344 sizeof(di->disc_information_length);
1345
1346 if (cgc.buflen > sizeof(disc_information))
1347 cgc.buflen = sizeof(disc_information);
1348
1349 cgc.cmd[8] = cgc.buflen;
1350 return pkt_generic_packet(pd, &cgc);
1351 }
1352
1353 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1354 {
1355 struct packet_command cgc;
1356 int ret;
1357
1358 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1359 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1360 cgc.cmd[1] = type & 3;
1361 cgc.cmd[4] = (track & 0xff00) >> 8;
1362 cgc.cmd[5] = track & 0xff;
1363 cgc.cmd[8] = 8;
1364 cgc.quiet = 1;
1365
1366 if ((ret = pkt_generic_packet(pd, &cgc)))
1367 return ret;
1368
1369 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1370 sizeof(ti->track_information_length);
1371
1372 if (cgc.buflen > sizeof(track_information))
1373 cgc.buflen = sizeof(track_information);
1374
1375 cgc.cmd[8] = cgc.buflen;
1376 return pkt_generic_packet(pd, &cgc);
1377 }
1378
1379 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1380 {
1381 disc_information di;
1382 track_information ti;
1383 __u32 last_track;
1384 int ret = -1;
1385
1386 if ((ret = pkt_get_disc_info(pd, &di)))
1387 return ret;
1388
1389 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1390 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1391 return ret;
1392
1393 /* if this track is blank, try the previous. */
1394 if (ti.blank) {
1395 last_track--;
1396 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1397 return ret;
1398 }
1399
1400 /* if last recorded field is valid, return it. */
1401 if (ti.lra_v) {
1402 *last_written = be32_to_cpu(ti.last_rec_address);
1403 } else {
1404 /* make it up instead */
1405 *last_written = be32_to_cpu(ti.track_start) +
1406 be32_to_cpu(ti.track_size);
1407 if (ti.free_blocks)
1408 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1409 }
1410 return 0;
1411 }
1412
1413 /*
1414 * write mode select package based on pd->settings
1415 */
1416 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1417 {
1418 struct packet_command cgc;
1419 struct request_sense sense;
1420 write_param_page *wp;
1421 char buffer[128];
1422 int ret, size;
1423
1424 /* doesn't apply to DVD+RW or DVD-RAM */
1425 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1426 return 0;
1427
1428 memset(buffer, 0, sizeof(buffer));
1429 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1430 cgc.sense = &sense;
1431 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1432 pkt_dump_sense(&cgc);
1433 return ret;
1434 }
1435
1436 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1437 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1438 if (size > sizeof(buffer))
1439 size = sizeof(buffer);
1440
1441 /*
1442 * now get it all
1443 */
1444 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1445 cgc.sense = &sense;
1446 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1447 pkt_dump_sense(&cgc);
1448 return ret;
1449 }
1450
1451 /*
1452 * write page is offset header + block descriptor length
1453 */
1454 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1455
1456 wp->fp = pd->settings.fp;
1457 wp->track_mode = pd->settings.track_mode;
1458 wp->write_type = pd->settings.write_type;
1459 wp->data_block_type = pd->settings.block_mode;
1460
1461 wp->multi_session = 0;
1462
1463 #ifdef PACKET_USE_LS
1464 wp->link_size = 7;
1465 wp->ls_v = 1;
1466 #endif
1467
1468 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1469 wp->session_format = 0;
1470 wp->subhdr2 = 0x20;
1471 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1472 wp->session_format = 0x20;
1473 wp->subhdr2 = 8;
1474 #if 0
1475 wp->mcn[0] = 0x80;
1476 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1477 #endif
1478 } else {
1479 /*
1480 * paranoia
1481 */
1482 printk("pktcdvd: write mode wrong %d\n", wp->data_block_type);
1483 return 1;
1484 }
1485 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1486
1487 cgc.buflen = cgc.cmd[8] = size;
1488 if ((ret = pkt_mode_select(pd, &cgc))) {
1489 pkt_dump_sense(&cgc);
1490 return ret;
1491 }
1492
1493 pkt_print_settings(pd);
1494 return 0;
1495 }
1496
1497 /*
1498 * 0 -- we can write to this track, 1 -- we can't
1499 */
1500 static int pkt_good_track(track_information *ti)
1501 {
1502 /*
1503 * only good for CD-RW at the moment, not DVD-RW
1504 */
1505
1506 /*
1507 * FIXME: only for FP
1508 */
1509 if (ti->fp == 0)
1510 return 0;
1511
1512 /*
1513 * "good" settings as per Mt Fuji.
1514 */
1515 if (ti->rt == 0 && ti->blank == 0 && ti->packet == 1)
1516 return 0;
1517
1518 if (ti->rt == 0 && ti->blank == 1 && ti->packet == 1)
1519 return 0;
1520
1521 if (ti->rt == 1 && ti->blank == 0 && ti->packet == 1)
1522 return 0;
1523
1524 printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1525 return 1;
1526 }
1527
1528 /*
1529 * 0 -- we can write to this disc, 1 -- we can't
1530 */
1531 static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di)
1532 {
1533 switch (pd->mmc3_profile) {
1534 case 0x0a: /* CD-RW */
1535 case 0xffff: /* MMC3 not supported */
1536 break;
1537 case 0x1a: /* DVD+RW */
1538 case 0x13: /* DVD-RW */
1539 case 0x12: /* DVD-RAM */
1540 return 0;
1541 default:
1542 printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
1543 return 1;
1544 }
1545
1546 /*
1547 * for disc type 0xff we should probably reserve a new track.
1548 * but i'm not sure, should we leave this to user apps? probably.
1549 */
1550 if (di->disc_type == 0xff) {
1551 printk("pktcdvd: Unknown disc. No track?\n");
1552 return 1;
1553 }
1554
1555 if (di->disc_type != 0x20 && di->disc_type != 0) {
1556 printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type);
1557 return 1;
1558 }
1559
1560 if (di->erasable == 0) {
1561 printk("pktcdvd: Disc not erasable\n");
1562 return 1;
1563 }
1564
1565 if (di->border_status == PACKET_SESSION_RESERVED) {
1566 printk("pktcdvd: Can't write to last track (reserved)\n");
1567 return 1;
1568 }
1569
1570 return 0;
1571 }
1572
1573 static int pkt_probe_settings(struct pktcdvd_device *pd)
1574 {
1575 struct packet_command cgc;
1576 unsigned char buf[12];
1577 disc_information di;
1578 track_information ti;
1579 int ret, track;
1580
1581 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1582 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1583 cgc.cmd[8] = 8;
1584 ret = pkt_generic_packet(pd, &cgc);
1585 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1586
1587 memset(&di, 0, sizeof(disc_information));
1588 memset(&ti, 0, sizeof(track_information));
1589
1590 if ((ret = pkt_get_disc_info(pd, &di))) {
1591 printk("failed get_disc\n");
1592 return ret;
1593 }
1594
1595 if (pkt_good_disc(pd, &di))
1596 return -ENXIO;
1597
1598 switch (pd->mmc3_profile) {
1599 case 0x1a: /* DVD+RW */
1600 printk("pktcdvd: inserted media is DVD+RW\n");
1601 break;
1602 case 0x13: /* DVD-RW */
1603 printk("pktcdvd: inserted media is DVD-RW\n");
1604 break;
1605 case 0x12: /* DVD-RAM */
1606 printk("pktcdvd: inserted media is DVD-RAM\n");
1607 break;
1608 default:
1609 printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : "");
1610 break;
1611 }
1612 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1613
1614 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1615 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1616 printk("pktcdvd: failed get_track\n");
1617 return ret;
1618 }
1619
1620 if (pkt_good_track(&ti)) {
1621 printk("pktcdvd: can't write to this track\n");
1622 return -ENXIO;
1623 }
1624
1625 /*
1626 * we keep packet size in 512 byte units, makes it easier to
1627 * deal with request calculations.
1628 */
1629 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1630 if (pd->settings.size == 0) {
1631 printk("pktcdvd: detected zero packet size!\n");
1632 pd->settings.size = 128;
1633 }
1634 pd->settings.fp = ti.fp;
1635 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1636
1637 if (ti.nwa_v) {
1638 pd->nwa = be32_to_cpu(ti.next_writable);
1639 set_bit(PACKET_NWA_VALID, &pd->flags);
1640 }
1641
1642 /*
1643 * in theory we could use lra on -RW media as well and just zero
1644 * blocks that haven't been written yet, but in practice that
1645 * is just a no-go. we'll use that for -R, naturally.
1646 */
1647 if (ti.lra_v) {
1648 pd->lra = be32_to_cpu(ti.last_rec_address);
1649 set_bit(PACKET_LRA_VALID, &pd->flags);
1650 } else {
1651 pd->lra = 0xffffffff;
1652 set_bit(PACKET_LRA_VALID, &pd->flags);
1653 }
1654
1655 /*
1656 * fine for now
1657 */
1658 pd->settings.link_loss = 7;
1659 pd->settings.write_type = 0; /* packet */
1660 pd->settings.track_mode = ti.track_mode;
1661
1662 /*
1663 * mode1 or mode2 disc
1664 */
1665 switch (ti.data_mode) {
1666 case PACKET_MODE1:
1667 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1668 break;
1669 case PACKET_MODE2:
1670 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1671 break;
1672 default:
1673 printk("pktcdvd: unknown data mode\n");
1674 return 1;
1675 }
1676 return 0;
1677 }
1678
1679 /*
1680 * enable/disable write caching on drive
1681 */
1682 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
1683 {
1684 struct packet_command cgc;
1685 struct request_sense sense;
1686 unsigned char buf[64];
1687 int ret;
1688
1689 memset(buf, 0, sizeof(buf));
1690 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1691 cgc.sense = &sense;
1692 cgc.buflen = pd->mode_offset + 12;
1693
1694 /*
1695 * caching mode page might not be there, so quiet this command
1696 */
1697 cgc.quiet = 1;
1698
1699 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1700 return ret;
1701
1702 buf[pd->mode_offset + 10] |= (!!set << 2);
1703
1704 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1705 ret = pkt_mode_select(pd, &cgc);
1706 if (ret) {
1707 printk("pktcdvd: write caching control failed\n");
1708 pkt_dump_sense(&cgc);
1709 } else if (!ret && set)
1710 printk("pktcdvd: enabled write caching on %s\n", pd->name);
1711 return ret;
1712 }
1713
1714 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1715 {
1716 struct packet_command cgc;
1717
1718 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1719 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1720 cgc.cmd[4] = lockflag ? 1 : 0;
1721 return pkt_generic_packet(pd, &cgc);
1722 }
1723
1724 /*
1725 * Returns drive maximum write speed
1726 */
1727 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
1728 {
1729 struct packet_command cgc;
1730 struct request_sense sense;
1731 unsigned char buf[256+18];
1732 unsigned char *cap_buf;
1733 int ret, offset;
1734
1735 memset(buf, 0, sizeof(buf));
1736 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1737 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1738 cgc.sense = &sense;
1739
1740 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1741 if (ret) {
1742 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1743 sizeof(struct mode_page_header);
1744 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1745 if (ret) {
1746 pkt_dump_sense(&cgc);
1747 return ret;
1748 }
1749 }
1750
1751 offset = 20; /* Obsoleted field, used by older drives */
1752 if (cap_buf[1] >= 28)
1753 offset = 28; /* Current write speed selected */
1754 if (cap_buf[1] >= 30) {
1755 /* If the drive reports at least one "Logical Unit Write
1756 * Speed Performance Descriptor Block", use the information
1757 * in the first block. (contains the highest speed)
1758 */
1759 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1760 if (num_spdb > 0)
1761 offset = 34;
1762 }
1763
1764 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1765 return 0;
1766 }
1767
1768 /* These tables from cdrecord - I don't have orange book */
1769 /* standard speed CD-RW (1-4x) */
1770 static char clv_to_speed[16] = {
1771 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1772 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1773 };
1774 /* high speed CD-RW (-10x) */
1775 static char hs_clv_to_speed[16] = {
1776 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1777 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1778 };
1779 /* ultra high speed CD-RW */
1780 static char us_clv_to_speed[16] = {
1781 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1782 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
1783 };
1784
1785 /*
1786 * reads the maximum media speed from ATIP
1787 */
1788 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
1789 {
1790 struct packet_command cgc;
1791 struct request_sense sense;
1792 unsigned char buf[64];
1793 unsigned int size, st, sp;
1794 int ret;
1795
1796 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
1797 cgc.sense = &sense;
1798 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1799 cgc.cmd[1] = 2;
1800 cgc.cmd[2] = 4; /* READ ATIP */
1801 cgc.cmd[8] = 2;
1802 ret = pkt_generic_packet(pd, &cgc);
1803 if (ret) {
1804 pkt_dump_sense(&cgc);
1805 return ret;
1806 }
1807 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
1808 if (size > sizeof(buf))
1809 size = sizeof(buf);
1810
1811 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1812 cgc.sense = &sense;
1813 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1814 cgc.cmd[1] = 2;
1815 cgc.cmd[2] = 4;
1816 cgc.cmd[8] = size;
1817 ret = pkt_generic_packet(pd, &cgc);
1818 if (ret) {
1819 pkt_dump_sense(&cgc);
1820 return ret;
1821 }
1822
1823 if (!buf[6] & 0x40) {
1824 printk("pktcdvd: Disc type is not CD-RW\n");
1825 return 1;
1826 }
1827 if (!buf[6] & 0x4) {
1828 printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n");
1829 return 1;
1830 }
1831
1832 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
1833
1834 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
1835
1836 /* Info from cdrecord */
1837 switch (st) {
1838 case 0: /* standard speed */
1839 *speed = clv_to_speed[sp];
1840 break;
1841 case 1: /* high speed */
1842 *speed = hs_clv_to_speed[sp];
1843 break;
1844 case 2: /* ultra high speed */
1845 *speed = us_clv_to_speed[sp];
1846 break;
1847 default:
1848 printk("pktcdvd: Unknown disc sub-type %d\n",st);
1849 return 1;
1850 }
1851 if (*speed) {
1852 printk("pktcdvd: Max. media speed: %d\n",*speed);
1853 return 0;
1854 } else {
1855 printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st);
1856 return 1;
1857 }
1858 }
1859
1860 static int pkt_perform_opc(struct pktcdvd_device *pd)
1861 {
1862 struct packet_command cgc;
1863 struct request_sense sense;
1864 int ret;
1865
1866 VPRINTK("pktcdvd: Performing OPC\n");
1867
1868 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1869 cgc.sense = &sense;
1870 cgc.timeout = 60*HZ;
1871 cgc.cmd[0] = GPCMD_SEND_OPC;
1872 cgc.cmd[1] = 1;
1873 if ((ret = pkt_generic_packet(pd, &cgc)))
1874 pkt_dump_sense(&cgc);
1875 return ret;
1876 }
1877
1878 static int pkt_open_write(struct pktcdvd_device *pd)
1879 {
1880 int ret;
1881 unsigned int write_speed, media_write_speed, read_speed;
1882
1883 if ((ret = pkt_probe_settings(pd))) {
1884 DPRINTK("pktcdvd: %s failed probe\n", pd->name);
1885 return -EIO;
1886 }
1887
1888 if ((ret = pkt_set_write_settings(pd))) {
1889 DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name);
1890 return -EIO;
1891 }
1892
1893 pkt_write_caching(pd, USE_WCACHING);
1894
1895 if ((ret = pkt_get_max_speed(pd, &write_speed)))
1896 write_speed = 16 * 177;
1897 switch (pd->mmc3_profile) {
1898 case 0x13: /* DVD-RW */
1899 case 0x1a: /* DVD+RW */
1900 case 0x12: /* DVD-RAM */
1901 DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
1902 break;
1903 default:
1904 if ((ret = pkt_media_speed(pd, &media_write_speed)))
1905 media_write_speed = 16;
1906 write_speed = min(write_speed, media_write_speed * 177);
1907 DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176);
1908 break;
1909 }
1910 read_speed = write_speed;
1911
1912 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
1913 DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
1914 return -EIO;
1915 }
1916 pd->write_speed = write_speed;
1917 pd->read_speed = read_speed;
1918
1919 if ((ret = pkt_perform_opc(pd))) {
1920 DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name);
1921 }
1922
1923 return 0;
1924 }
1925
1926 /*
1927 * called at open time.
1928 */
1929 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
1930 {
1931 int ret;
1932 long lba;
1933 request_queue_t *q;
1934
1935 /*
1936 * We need to re-open the cdrom device without O_NONBLOCK to be able
1937 * to read/write from/to it. It is already opened in O_NONBLOCK mode
1938 * so bdget() can't fail.
1939 */
1940 bdget(pd->bdev->bd_dev);
1941 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
1942 goto out;
1943
1944 if ((ret = pkt_get_last_written(pd, &lba))) {
1945 printk("pktcdvd: pkt_get_last_written failed\n");
1946 goto out_putdev;
1947 }
1948
1949 set_capacity(pd->disk, lba << 2);
1950 set_capacity(pd->bdev->bd_disk, lba << 2);
1951 bd_set_size(pd->bdev, (loff_t)lba << 11);
1952
1953 q = bdev_get_queue(pd->bdev);
1954 if (write) {
1955 if ((ret = pkt_open_write(pd)))
1956 goto out_putdev;
1957 /*
1958 * Some CDRW drives can not handle writes larger than one packet,
1959 * even if the size is a multiple of the packet size.
1960 */
1961 spin_lock_irq(q->queue_lock);
1962 blk_queue_max_sectors(q, pd->settings.size);
1963 spin_unlock_irq(q->queue_lock);
1964 set_bit(PACKET_WRITABLE, &pd->flags);
1965 } else {
1966 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1967 clear_bit(PACKET_WRITABLE, &pd->flags);
1968 }
1969
1970 if ((ret = pkt_set_segment_merging(pd, q)))
1971 goto out_putdev;
1972
1973 if (write)
1974 printk("pktcdvd: %lukB available on disc\n", lba << 1);
1975
1976 return 0;
1977
1978 out_putdev:
1979 blkdev_put(pd->bdev);
1980 out:
1981 return ret;
1982 }
1983
1984 /*
1985 * called when the device is closed. makes sure that the device flushes
1986 * the internal cache before we close.
1987 */
1988 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
1989 {
1990 if (flush && pkt_flush_cache(pd))
1991 DPRINTK("pktcdvd: %s not flushing cache\n", pd->name);
1992
1993 pkt_lock_door(pd, 0);
1994
1995 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1996 blkdev_put(pd->bdev);
1997 }
1998
1999 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2000 {
2001 if (dev_minor >= MAX_WRITERS)
2002 return NULL;
2003 return pkt_devs[dev_minor];
2004 }
2005
2006 static int pkt_open(struct inode *inode, struct file *file)
2007 {
2008 struct pktcdvd_device *pd = NULL;
2009 int ret;
2010
2011 VPRINTK("pktcdvd: entering open\n");
2012
2013 down(&ctl_mutex);
2014 pd = pkt_find_dev_from_minor(iminor(inode));
2015 if (!pd) {
2016 ret = -ENODEV;
2017 goto out;
2018 }
2019 BUG_ON(pd->refcnt < 0);
2020
2021 pd->refcnt++;
2022 if (pd->refcnt == 1) {
2023 if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) {
2024 ret = -EIO;
2025 goto out_dec;
2026 }
2027 /*
2028 * needed here as well, since ext2 (among others) may change
2029 * the blocksize at mount time
2030 */
2031 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2032 }
2033
2034 up(&ctl_mutex);
2035 return 0;
2036
2037 out_dec:
2038 pd->refcnt--;
2039 out:
2040 VPRINTK("pktcdvd: failed open (%d)\n", ret);
2041 up(&ctl_mutex);
2042 return ret;
2043 }
2044
2045 static int pkt_close(struct inode *inode, struct file *file)
2046 {
2047 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2048 int ret = 0;
2049
2050 down(&ctl_mutex);
2051 pd->refcnt--;
2052 BUG_ON(pd->refcnt < 0);
2053 if (pd->refcnt == 0) {
2054 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2055 pkt_release_dev(pd, flush);
2056 }
2057 up(&ctl_mutex);
2058 return ret;
2059 }
2060
2061
2062 static void *psd_pool_alloc(unsigned int __nocast gfp_mask, void *data)
2063 {
2064 return kmalloc(sizeof(struct packet_stacked_data), gfp_mask);
2065 }
2066
2067 static void psd_pool_free(void *ptr, void *data)
2068 {
2069 kfree(ptr);
2070 }
2071
2072 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2073 {
2074 struct packet_stacked_data *psd = bio->bi_private;
2075 struct pktcdvd_device *pd = psd->pd;
2076
2077 if (bio->bi_size)
2078 return 1;
2079
2080 bio_put(bio);
2081 bio_endio(psd->bio, psd->bio->bi_size, err);
2082 mempool_free(psd, psd_pool);
2083 pkt_bio_finished(pd);
2084 return 0;
2085 }
2086
2087 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2088 {
2089 struct pktcdvd_device *pd;
2090 char b[BDEVNAME_SIZE];
2091 sector_t zone;
2092 struct packet_data *pkt;
2093 int was_empty, blocked_bio;
2094 struct pkt_rb_node *node;
2095
2096 pd = q->queuedata;
2097 if (!pd) {
2098 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2099 goto end_io;
2100 }
2101
2102 /*
2103 * Clone READ bios so we can have our own bi_end_io callback.
2104 */
2105 if (bio_data_dir(bio) == READ) {
2106 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2107 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2108
2109 psd->pd = pd;
2110 psd->bio = bio;
2111 cloned_bio->bi_bdev = pd->bdev;
2112 cloned_bio->bi_private = psd;
2113 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2114 pd->stats.secs_r += bio->bi_size >> 9;
2115 pkt_queue_bio(pd, cloned_bio, 1);
2116 return 0;
2117 }
2118
2119 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2120 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2121 pd->name, (unsigned long long)bio->bi_sector);
2122 goto end_io;
2123 }
2124
2125 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2126 printk("pktcdvd: wrong bio size\n");
2127 goto end_io;
2128 }
2129
2130 blk_queue_bounce(q, &bio);
2131
2132 zone = ZONE(bio->bi_sector, pd);
2133 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2134 (unsigned long long)bio->bi_sector,
2135 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2136
2137 /* Check if we have to split the bio */
2138 {
2139 struct bio_pair *bp;
2140 sector_t last_zone;
2141 int first_sectors;
2142
2143 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2144 if (last_zone != zone) {
2145 BUG_ON(last_zone != zone + pd->settings.size);
2146 first_sectors = last_zone - bio->bi_sector;
2147 bp = bio_split(bio, bio_split_pool, first_sectors);
2148 BUG_ON(!bp);
2149 pkt_make_request(q, &bp->bio1);
2150 pkt_make_request(q, &bp->bio2);
2151 bio_pair_release(bp);
2152 return 0;
2153 }
2154 }
2155
2156 /*
2157 * If we find a matching packet in state WAITING or READ_WAIT, we can
2158 * just append this bio to that packet.
2159 */
2160 spin_lock(&pd->cdrw.active_list_lock);
2161 blocked_bio = 0;
2162 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2163 if (pkt->sector == zone) {
2164 spin_lock(&pkt->lock);
2165 if ((pkt->state == PACKET_WAITING_STATE) ||
2166 (pkt->state == PACKET_READ_WAIT_STATE)) {
2167 pkt_add_list_last(bio, &pkt->orig_bios,
2168 &pkt->orig_bios_tail);
2169 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2170 if ((pkt->write_size >= pkt->frames) &&
2171 (pkt->state == PACKET_WAITING_STATE)) {
2172 atomic_inc(&pkt->run_sm);
2173 wake_up(&pd->wqueue);
2174 }
2175 spin_unlock(&pkt->lock);
2176 spin_unlock(&pd->cdrw.active_list_lock);
2177 return 0;
2178 } else {
2179 blocked_bio = 1;
2180 }
2181 spin_unlock(&pkt->lock);
2182 }
2183 }
2184 spin_unlock(&pd->cdrw.active_list_lock);
2185
2186 /*
2187 * No matching packet found. Store the bio in the work queue.
2188 */
2189 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2190 BUG_ON(!node);
2191 node->bio = bio;
2192 spin_lock(&pd->lock);
2193 BUG_ON(pd->bio_queue_size < 0);
2194 was_empty = (pd->bio_queue_size == 0);
2195 pkt_rbtree_insert(pd, node);
2196 spin_unlock(&pd->lock);
2197
2198 /*
2199 * Wake up the worker thread.
2200 */
2201 atomic_set(&pd->scan_queue, 1);
2202 if (was_empty) {
2203 /* This wake_up is required for correct operation */
2204 wake_up(&pd->wqueue);
2205 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2206 /*
2207 * This wake up is not required for correct operation,
2208 * but improves performance in some cases.
2209 */
2210 wake_up(&pd->wqueue);
2211 }
2212 return 0;
2213 end_io:
2214 bio_io_error(bio, bio->bi_size);
2215 return 0;
2216 }
2217
2218
2219
2220 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2221 {
2222 struct pktcdvd_device *pd = q->queuedata;
2223 sector_t zone = ZONE(bio->bi_sector, pd);
2224 int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2225 int remaining = (pd->settings.size << 9) - used;
2226 int remaining2;
2227
2228 /*
2229 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2230 * boundary, pkt_make_request() will split the bio.
2231 */
2232 remaining2 = PAGE_SIZE - bio->bi_size;
2233 remaining = max(remaining, remaining2);
2234
2235 BUG_ON(remaining < 0);
2236 return remaining;
2237 }
2238
2239 static void pkt_init_queue(struct pktcdvd_device *pd)
2240 {
2241 request_queue_t *q = pd->disk->queue;
2242
2243 blk_queue_make_request(q, pkt_make_request);
2244 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2245 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2246 blk_queue_merge_bvec(q, pkt_merge_bvec);
2247 q->queuedata = pd;
2248 }
2249
2250 static int pkt_seq_show(struct seq_file *m, void *p)
2251 {
2252 struct pktcdvd_device *pd = m->private;
2253 char *msg;
2254 char bdev_buf[BDEVNAME_SIZE];
2255 int states[PACKET_NUM_STATES];
2256
2257 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2258 bdevname(pd->bdev, bdev_buf));
2259
2260 seq_printf(m, "\nSettings:\n");
2261 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2262
2263 if (pd->settings.write_type == 0)
2264 msg = "Packet";
2265 else
2266 msg = "Unknown";
2267 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2268
2269 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2270 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2271
2272 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2273
2274 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2275 msg = "Mode 1";
2276 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2277 msg = "Mode 2";
2278 else
2279 msg = "Unknown";
2280 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2281
2282 seq_printf(m, "\nStatistics:\n");
2283 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2284 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2285 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2286 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2287 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2288
2289 seq_printf(m, "\nMisc:\n");
2290 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2291 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2292 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2293 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2294 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2295 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2296
2297 seq_printf(m, "\nQueue state:\n");
2298 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2299 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2300 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2301
2302 pkt_count_states(pd, states);
2303 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2304 states[0], states[1], states[2], states[3], states[4], states[5]);
2305
2306 return 0;
2307 }
2308
2309 static int pkt_seq_open(struct inode *inode, struct file *file)
2310 {
2311 return single_open(file, pkt_seq_show, PDE(inode)->data);
2312 }
2313
2314 static struct file_operations pkt_proc_fops = {
2315 .open = pkt_seq_open,
2316 .read = seq_read,
2317 .llseek = seq_lseek,
2318 .release = single_release
2319 };
2320
2321 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2322 {
2323 int i;
2324 int ret = 0;
2325 char b[BDEVNAME_SIZE];
2326 struct proc_dir_entry *proc;
2327 struct block_device *bdev;
2328
2329 if (pd->pkt_dev == dev) {
2330 printk("pktcdvd: Recursive setup not allowed\n");
2331 return -EBUSY;
2332 }
2333 for (i = 0; i < MAX_WRITERS; i++) {
2334 struct pktcdvd_device *pd2 = pkt_devs[i];
2335 if (!pd2)
2336 continue;
2337 if (pd2->bdev->bd_dev == dev) {
2338 printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b));
2339 return -EBUSY;
2340 }
2341 if (pd2->pkt_dev == dev) {
2342 printk("pktcdvd: Can't chain pktcdvd devices\n");
2343 return -EBUSY;
2344 }
2345 }
2346
2347 bdev = bdget(dev);
2348 if (!bdev)
2349 return -ENOMEM;
2350 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2351 if (ret)
2352 return ret;
2353
2354 /* This is safe, since we have a reference from open(). */
2355 __module_get(THIS_MODULE);
2356
2357 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2358 printk("pktcdvd: not enough memory for buffers\n");
2359 ret = -ENOMEM;
2360 goto out_mem;
2361 }
2362
2363 pd->bdev = bdev;
2364 set_blocksize(bdev, CD_FRAMESIZE);
2365
2366 pkt_init_queue(pd);
2367
2368 atomic_set(&pd->cdrw.pending_bios, 0);
2369 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2370 if (IS_ERR(pd->cdrw.thread)) {
2371 printk("pktcdvd: can't start kernel thread\n");
2372 ret = -ENOMEM;
2373 goto out_thread;
2374 }
2375
2376 proc = create_proc_entry(pd->name, 0, pkt_proc);
2377 if (proc) {
2378 proc->data = pd;
2379 proc->proc_fops = &pkt_proc_fops;
2380 }
2381 DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2382 return 0;
2383
2384 out_thread:
2385 pkt_shrink_pktlist(pd);
2386 out_mem:
2387 blkdev_put(bdev);
2388 /* This is safe: open() is still holding a reference. */
2389 module_put(THIS_MODULE);
2390 return ret;
2391 }
2392
2393 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2394 {
2395 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2396
2397 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2398 BUG_ON(!pd);
2399
2400 switch (cmd) {
2401 /*
2402 * forward selected CDROM ioctls to CD-ROM, for UDF
2403 */
2404 case CDROMMULTISESSION:
2405 case CDROMREADTOCENTRY:
2406 case CDROM_LAST_WRITTEN:
2407 case CDROM_SEND_PACKET:
2408 case SCSI_IOCTL_SEND_COMMAND:
2409 return ioctl_by_bdev(pd->bdev, cmd, arg);
2410
2411 case CDROMEJECT:
2412 /*
2413 * The door gets locked when the device is opened, so we
2414 * have to unlock it or else the eject command fails.
2415 */
2416 pkt_lock_door(pd, 0);
2417 return ioctl_by_bdev(pd->bdev, cmd, arg);
2418
2419 default:
2420 printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);
2421 return -ENOTTY;
2422 }
2423
2424 return 0;
2425 }
2426
2427 static int pkt_media_changed(struct gendisk *disk)
2428 {
2429 struct pktcdvd_device *pd = disk->private_data;
2430 struct gendisk *attached_disk;
2431
2432 if (!pd)
2433 return 0;
2434 if (!pd->bdev)
2435 return 0;
2436 attached_disk = pd->bdev->bd_disk;
2437 if (!attached_disk)
2438 return 0;
2439 return attached_disk->fops->media_changed(attached_disk);
2440 }
2441
2442 static struct block_device_operations pktcdvd_ops = {
2443 .owner = THIS_MODULE,
2444 .open = pkt_open,
2445 .release = pkt_close,
2446 .ioctl = pkt_ioctl,
2447 .media_changed = pkt_media_changed,
2448 };
2449
2450 /*
2451 * Set up mapping from pktcdvd device to CD-ROM device.
2452 */
2453 static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd)
2454 {
2455 int idx;
2456 int ret = -ENOMEM;
2457 struct pktcdvd_device *pd;
2458 struct gendisk *disk;
2459 dev_t dev = new_decode_dev(ctrl_cmd->dev);
2460
2461 for (idx = 0; idx < MAX_WRITERS; idx++)
2462 if (!pkt_devs[idx])
2463 break;
2464 if (idx == MAX_WRITERS) {
2465 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS);
2466 return -EBUSY;
2467 }
2468
2469 pd = kmalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2470 if (!pd)
2471 return ret;
2472 memset(pd, 0, sizeof(struct pktcdvd_device));
2473
2474 pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL);
2475 if (!pd->rb_pool)
2476 goto out_mem;
2477
2478 disk = alloc_disk(1);
2479 if (!disk)
2480 goto out_mem;
2481 pd->disk = disk;
2482
2483 spin_lock_init(&pd->lock);
2484 spin_lock_init(&pd->iosched.lock);
2485 sprintf(pd->name, "pktcdvd%d", idx);
2486 init_waitqueue_head(&pd->wqueue);
2487 pd->bio_queue = RB_ROOT;
2488
2489 disk->major = pkt_major;
2490 disk->first_minor = idx;
2491 disk->fops = &pktcdvd_ops;
2492 disk->flags = GENHD_FL_REMOVABLE;
2493 sprintf(disk->disk_name, "pktcdvd%d", idx);
2494 disk->private_data = pd;
2495 disk->queue = blk_alloc_queue(GFP_KERNEL);
2496 if (!disk->queue)
2497 goto out_mem2;
2498
2499 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2500 ret = pkt_new_dev(pd, dev);
2501 if (ret)
2502 goto out_new_dev;
2503
2504 add_disk(disk);
2505 pkt_devs[idx] = pd;
2506 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2507 return 0;
2508
2509 out_new_dev:
2510 blk_put_queue(disk->queue);
2511 out_mem2:
2512 put_disk(disk);
2513 out_mem:
2514 if (pd->rb_pool)
2515 mempool_destroy(pd->rb_pool);
2516 kfree(pd);
2517 return ret;
2518 }
2519
2520 /*
2521 * Tear down mapping from pktcdvd device to CD-ROM device.
2522 */
2523 static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd)
2524 {
2525 struct pktcdvd_device *pd;
2526 int idx;
2527 dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev);
2528
2529 for (idx = 0; idx < MAX_WRITERS; idx++) {
2530 pd = pkt_devs[idx];
2531 if (pd && (pd->pkt_dev == pkt_dev))
2532 break;
2533 }
2534 if (idx == MAX_WRITERS) {
2535 DPRINTK("pktcdvd: dev not setup\n");
2536 return -ENXIO;
2537 }
2538
2539 if (pd->refcnt > 0)
2540 return -EBUSY;
2541
2542 if (!IS_ERR(pd->cdrw.thread))
2543 kthread_stop(pd->cdrw.thread);
2544
2545 blkdev_put(pd->bdev);
2546
2547 pkt_shrink_pktlist(pd);
2548
2549 remove_proc_entry(pd->name, pkt_proc);
2550 DPRINTK("pktcdvd: writer %s unmapped\n", pd->name);
2551
2552 del_gendisk(pd->disk);
2553 blk_put_queue(pd->disk->queue);
2554 put_disk(pd->disk);
2555
2556 pkt_devs[idx] = NULL;
2557 mempool_destroy(pd->rb_pool);
2558 kfree(pd);
2559
2560 /* This is safe: open() is still holding a reference. */
2561 module_put(THIS_MODULE);
2562 return 0;
2563 }
2564
2565 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2566 {
2567 struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2568 if (pd) {
2569 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2570 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2571 } else {
2572 ctrl_cmd->dev = 0;
2573 ctrl_cmd->pkt_dev = 0;
2574 }
2575 ctrl_cmd->num_devices = MAX_WRITERS;
2576 }
2577
2578 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2579 {
2580 void __user *argp = (void __user *)arg;
2581 struct pkt_ctrl_command ctrl_cmd;
2582 int ret = 0;
2583
2584 if (cmd != PACKET_CTRL_CMD)
2585 return -ENOTTY;
2586
2587 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2588 return -EFAULT;
2589
2590 switch (ctrl_cmd.command) {
2591 case PKT_CTRL_CMD_SETUP:
2592 if (!capable(CAP_SYS_ADMIN))
2593 return -EPERM;
2594 down(&ctl_mutex);
2595 ret = pkt_setup_dev(&ctrl_cmd);
2596 up(&ctl_mutex);
2597 break;
2598 case PKT_CTRL_CMD_TEARDOWN:
2599 if (!capable(CAP_SYS_ADMIN))
2600 return -EPERM;
2601 down(&ctl_mutex);
2602 ret = pkt_remove_dev(&ctrl_cmd);
2603 up(&ctl_mutex);
2604 break;
2605 case PKT_CTRL_CMD_STATUS:
2606 down(&ctl_mutex);
2607 pkt_get_status(&ctrl_cmd);
2608 up(&ctl_mutex);
2609 break;
2610 default:
2611 return -ENOTTY;
2612 }
2613
2614 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2615 return -EFAULT;
2616 return ret;
2617 }
2618
2619
2620 static struct file_operations pkt_ctl_fops = {
2621 .ioctl = pkt_ctl_ioctl,
2622 .owner = THIS_MODULE,
2623 };
2624
2625 static struct miscdevice pkt_misc = {
2626 .minor = MISC_DYNAMIC_MINOR,
2627 .name = "pktcdvd",
2628 .devfs_name = "pktcdvd/control",
2629 .fops = &pkt_ctl_fops
2630 };
2631
2632 static int __init pkt_init(void)
2633 {
2634 int ret;
2635
2636 psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL);
2637 if (!psd_pool)
2638 return -ENOMEM;
2639
2640 ret = register_blkdev(pkt_major, "pktcdvd");
2641 if (ret < 0) {
2642 printk("pktcdvd: Unable to register block device\n");
2643 goto out2;
2644 }
2645 if (!pkt_major)
2646 pkt_major = ret;
2647
2648 ret = misc_register(&pkt_misc);
2649 if (ret) {
2650 printk("pktcdvd: Unable to register misc device\n");
2651 goto out;
2652 }
2653
2654 init_MUTEX(&ctl_mutex);
2655
2656 pkt_proc = proc_mkdir("pktcdvd", proc_root_driver);
2657
2658 DPRINTK("pktcdvd: %s\n", VERSION_CODE);
2659 return 0;
2660
2661 out:
2662 unregister_blkdev(pkt_major, "pktcdvd");
2663 out2:
2664 mempool_destroy(psd_pool);
2665 return ret;
2666 }
2667
2668 static void __exit pkt_exit(void)
2669 {
2670 remove_proc_entry("pktcdvd", proc_root_driver);
2671 misc_deregister(&pkt_misc);
2672 unregister_blkdev(pkt_major, "pktcdvd");
2673 mempool_destroy(psd_pool);
2674 }
2675
2676 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2677 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2678 MODULE_LICENSE("GPL");
2679
2680 module_init(pkt_init);
2681 module_exit(pkt_exit);
kernel source for telekom puls (alcatel/mediatek)