?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / block / pktcdvd.c
blobb9a6b7ad64f383c4056a3d9ff9d7b35dc56209e2
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 bio = NULL;
919 goto try_next_bio;
920 }
921 }
922 break;
923 try_next_bio:
924 node = pkt_rbtree_next(node);
925 if (!node) {
926 n = rb_first(&pd->bio_queue);
927 if (n)
928 node = rb_entry(n, struct pkt_rb_node, rb_node);
929 }
930 if (node == first_node)
931 node = NULL;
932 }
933 spin_unlock(&pd->lock);
934 if (!bio) {
935 VPRINTK("handle_queue: no bio\n");
936 return 0;
937 }
938
939 pkt = pkt_get_packet_data(pd, zone);
940 BUG_ON(!pkt);
941
942 pd->current_sector = zone + pd->settings.size;
943 pkt->sector = zone;
944 pkt->frames = pd->settings.size >> 2;
945 BUG_ON(pkt->frames > PACKET_MAX_SIZE);
946 pkt->write_size = 0;
947
948 /*
949 * Scan work queue for bios in the same zone and link them
950 * to this packet.
951 */
952 spin_lock(&pd->lock);
953 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
954 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
955 bio = node->bio;
956 VPRINTK("pkt_handle_queue: found zone=%llx\n",
957 (unsigned long long)ZONE(bio->bi_sector, pd));
958 if (ZONE(bio->bi_sector, pd) != zone)
959 break;
960 pkt_rbtree_erase(pd, node);
961 spin_lock(&pkt->lock);
962 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
963 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
964 spin_unlock(&pkt->lock);
965 }
966 spin_unlock(&pd->lock);
967
968 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
969 pkt_set_state(pkt, PACKET_WAITING_STATE);
970 atomic_set(&pkt->run_sm, 1);
971
972 spin_lock(&pd->cdrw.active_list_lock);
973 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
974 spin_unlock(&pd->cdrw.active_list_lock);
975
976 return 1;
977 }
978
979 /*
980 * Assemble a bio to write one packet and queue the bio for processing
981 * by the underlying block device.
982 */
983 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
984 {
985 struct bio *bio;
986 struct page *pages[PACKET_MAX_SIZE];
987 int offsets[PACKET_MAX_SIZE];
988 int f;
989 int frames_write;
990
991 for (f = 0; f < pkt->frames; f++) {
992 pages[f] = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
993 offsets[f] = (f * CD_FRAMESIZE) % PAGE_SIZE;
994 }
995
996 /*
997 * Fill-in pages[] and offsets[] with data from orig_bios.
998 */
999 frames_write = 0;
1000 spin_lock(&pkt->lock);
1001 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1002 int segment = bio->bi_idx;
1003 int src_offs = 0;
1004 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1005 int num_frames = bio->bi_size / CD_FRAMESIZE;
1006 BUG_ON(first_frame < 0);
1007 BUG_ON(first_frame + num_frames > pkt->frames);
1008 for (f = first_frame; f < first_frame + num_frames; f++) {
1009 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1010
1011 while (src_offs >= src_bvl->bv_len) {
1012 src_offs -= src_bvl->bv_len;
1013 segment++;
1014 BUG_ON(segment >= bio->bi_vcnt);
1015 src_bvl = bio_iovec_idx(bio, segment);
1016 }
1017
1018 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1019 pages[f] = src_bvl->bv_page;
1020 offsets[f] = src_bvl->bv_offset + src_offs;
1021 } else {
1022 pkt_copy_bio_data(bio, segment, src_offs,
1023 pages[f], offsets[f]);
1024 }
1025 src_offs += CD_FRAMESIZE;
1026 frames_write++;
1027 }
1028 }
1029 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1030 spin_unlock(&pkt->lock);
1031
1032 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1033 frames_write, (unsigned long long)pkt->sector);
1034 BUG_ON(frames_write != pkt->write_size);
1035
1036 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1037 pkt_make_local_copy(pkt, pages, offsets);
1038 pkt->cache_valid = 1;
1039 } else {
1040 pkt->cache_valid = 0;
1041 }
1042
1043 /* Start the write request */
1044 bio_init(pkt->w_bio);
1045 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1046 pkt->w_bio->bi_sector = pkt->sector;
1047 pkt->w_bio->bi_bdev = pd->bdev;
1048 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1049 pkt->w_bio->bi_private = pkt;
1050 for (f = 0; f < pkt->frames; f++) {
1051 if ((f + 1 < pkt->frames) && (pages[f + 1] == pages[f]) &&
1052 (offsets[f + 1] = offsets[f] + CD_FRAMESIZE)) {
1053 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE * 2, offsets[f]))
1054 BUG();
1055 f++;
1056 } else {
1057 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE, offsets[f]))
1058 BUG();
1059 }
1060 }
1061 VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt);
1062
1063 atomic_set(&pkt->io_wait, 1);
1064 pkt->w_bio->bi_rw = WRITE;
1065 pkt_queue_bio(pd, pkt->w_bio, 0);
1066 }
1067
1068 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1069 {
1070 struct bio *bio, *next;
1071
1072 if (!uptodate)
1073 pkt->cache_valid = 0;
1074
1075 /* Finish all bios corresponding to this packet */
1076 bio = pkt->orig_bios;
1077 while (bio) {
1078 next = bio->bi_next;
1079 bio->bi_next = NULL;
1080 bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
1081 bio = next;
1082 }
1083 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1084 }
1085
1086 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1087 {
1088 int uptodate;
1089
1090 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1091
1092 for (;;) {
1093 switch (pkt->state) {
1094 case PACKET_WAITING_STATE:
1095 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1096 return;
1097
1098 pkt->sleep_time = 0;
1099 pkt_gather_data(pd, pkt);
1100 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1101 break;
1102
1103 case PACKET_READ_WAIT_STATE:
1104 if (atomic_read(&pkt->io_wait) > 0)
1105 return;
1106
1107 if (atomic_read(&pkt->io_errors) > 0) {
1108 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1109 } else {
1110 pkt_start_write(pd, pkt);
1111 }
1112 break;
1113
1114 case PACKET_WRITE_WAIT_STATE:
1115 if (atomic_read(&pkt->io_wait) > 0)
1116 return;
1117
1118 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1119 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1120 } else {
1121 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1122 }
1123 break;
1124
1125 case PACKET_RECOVERY_STATE:
1126 if (pkt_start_recovery(pkt)) {
1127 pkt_start_write(pd, pkt);
1128 } else {
1129 VPRINTK("No recovery possible\n");
1130 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1131 }
1132 break;
1133
1134 case PACKET_FINISHED_STATE:
1135 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1136 pkt_finish_packet(pkt, uptodate);
1137 return;
1138
1139 default:
1140 BUG();
1141 break;
1142 }
1143 }
1144 }
1145
1146 static void pkt_handle_packets(struct pktcdvd_device *pd)
1147 {
1148 struct packet_data *pkt, *next;
1149
1150 VPRINTK("pkt_handle_packets\n");
1151
1152 /*
1153 * Run state machine for active packets
1154 */
1155 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1156 if (atomic_read(&pkt->run_sm) > 0) {
1157 atomic_set(&pkt->run_sm, 0);
1158 pkt_run_state_machine(pd, pkt);
1159 }
1160 }
1161
1162 /*
1163 * Move no longer active packets to the free list
1164 */
1165 spin_lock(&pd->cdrw.active_list_lock);
1166 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1167 if (pkt->state == PACKET_FINISHED_STATE) {
1168 list_del(&pkt->list);
1169 pkt_put_packet_data(pd, pkt);
1170 pkt_set_state(pkt, PACKET_IDLE_STATE);
1171 atomic_set(&pd->scan_queue, 1);
1172 }
1173 }
1174 spin_unlock(&pd->cdrw.active_list_lock);
1175 }
1176
1177 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1178 {
1179 struct packet_data *pkt;
1180 int i;
1181
1182 for (i = 0; i <= PACKET_NUM_STATES; i++)
1183 states[i] = 0;
1184
1185 spin_lock(&pd->cdrw.active_list_lock);
1186 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1187 states[pkt->state]++;
1188 }
1189 spin_unlock(&pd->cdrw.active_list_lock);
1190 }
1191
1192 /*
1193 * kcdrwd is woken up when writes have been queued for one of our
1194 * registered devices
1195 */
1196 static int kcdrwd(void *foobar)
1197 {
1198 struct pktcdvd_device *pd = foobar;
1199 struct packet_data *pkt;
1200 long min_sleep_time, residue;
1201
1202 set_user_nice(current, -20);
1203
1204 for (;;) {
1205 DECLARE_WAITQUEUE(wait, current);
1206
1207 /*
1208 * Wait until there is something to do
1209 */
1210 add_wait_queue(&pd->wqueue, &wait);
1211 for (;;) {
1212 set_current_state(TASK_INTERRUPTIBLE);
1213
1214 /* Check if we need to run pkt_handle_queue */
1215 if (atomic_read(&pd->scan_queue) > 0)
1216 goto work_to_do;
1217
1218 /* Check if we need to run the state machine for some packet */
1219 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1220 if (atomic_read(&pkt->run_sm) > 0)
1221 goto work_to_do;
1222 }
1223
1224 /* Check if we need to process the iosched queues */
1225 if (atomic_read(&pd->iosched.attention) != 0)
1226 goto work_to_do;
1227
1228 /* Otherwise, go to sleep */
1229 if (PACKET_DEBUG > 1) {
1230 int states[PACKET_NUM_STATES];
1231 pkt_count_states(pd, states);
1232 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1233 states[0], states[1], states[2], states[3],
1234 states[4], states[5]);
1235 }
1236
1237 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1238 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1239 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1240 min_sleep_time = pkt->sleep_time;
1241 }
1242
1243 generic_unplug_device(bdev_get_queue(pd->bdev));
1244
1245 VPRINTK("kcdrwd: sleeping\n");
1246 residue = schedule_timeout(min_sleep_time);
1247 VPRINTK("kcdrwd: wake up\n");
1248
1249 /* make swsusp happy with our thread */
1250 if (current->flags & PF_FREEZE)
1251 refrigerator(PF_FREEZE);
1252
1253 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1254 if (!pkt->sleep_time)
1255 continue;
1256 pkt->sleep_time -= min_sleep_time - residue;
1257 if (pkt->sleep_time <= 0) {
1258 pkt->sleep_time = 0;
1259 atomic_inc(&pkt->run_sm);
1260 }
1261 }
1262
1263 if (signal_pending(current)) {
1264 flush_signals(current);
1265 }
1266 if (kthread_should_stop())
1267 break;
1268 }
1269 work_to_do:
1270 set_current_state(TASK_RUNNING);
1271 remove_wait_queue(&pd->wqueue, &wait);
1272
1273 if (kthread_should_stop())
1274 break;
1275
1276 /*
1277 * if pkt_handle_queue returns true, we can queue
1278 * another request.
1279 */
1280 while (pkt_handle_queue(pd))
1281 ;
1282
1283 /*
1284 * Handle packet state machine
1285 */
1286 pkt_handle_packets(pd);
1287
1288 /*
1289 * Handle iosched queues
1290 */
1291 pkt_iosched_process_queue(pd);
1292 }
1293
1294 return 0;
1295 }
1296
1297 static void pkt_print_settings(struct pktcdvd_device *pd)
1298 {
1299 printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1300 printk("%u blocks, ", pd->settings.size >> 2);
1301 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1302 }
1303
1304 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1305 {
1306 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1307
1308 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1309 cgc->cmd[2] = page_code | (page_control << 6);
1310 cgc->cmd[7] = cgc->buflen >> 8;
1311 cgc->cmd[8] = cgc->buflen & 0xff;
1312 cgc->data_direction = CGC_DATA_READ;
1313 return pkt_generic_packet(pd, cgc);
1314 }
1315
1316 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1317 {
1318 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1319 memset(cgc->buffer, 0, 2);
1320 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1321 cgc->cmd[1] = 0x10; /* PF */
1322 cgc->cmd[7] = cgc->buflen >> 8;
1323 cgc->cmd[8] = cgc->buflen & 0xff;
1324 cgc->data_direction = CGC_DATA_WRITE;
1325 return pkt_generic_packet(pd, cgc);
1326 }
1327
1328 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1329 {
1330 struct packet_command cgc;
1331 int ret;
1332
1333 /* set up command and get the disc info */
1334 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1335 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1336 cgc.cmd[8] = cgc.buflen = 2;
1337 cgc.quiet = 1;
1338
1339 if ((ret = pkt_generic_packet(pd, &cgc)))
1340 return ret;
1341
1342 /* not all drives have the same disc_info length, so requeue
1343 * packet with the length the drive tells us it can supply
1344 */
1345 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1346 sizeof(di->disc_information_length);
1347
1348 if (cgc.buflen > sizeof(disc_information))
1349 cgc.buflen = sizeof(disc_information);
1350
1351 cgc.cmd[8] = cgc.buflen;
1352 return pkt_generic_packet(pd, &cgc);
1353 }
1354
1355 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1356 {
1357 struct packet_command cgc;
1358 int ret;
1359
1360 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1361 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1362 cgc.cmd[1] = type & 3;
1363 cgc.cmd[4] = (track & 0xff00) >> 8;
1364 cgc.cmd[5] = track & 0xff;
1365 cgc.cmd[8] = 8;
1366 cgc.quiet = 1;
1367
1368 if ((ret = pkt_generic_packet(pd, &cgc)))
1369 return ret;
1370
1371 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1372 sizeof(ti->track_information_length);
1373
1374 if (cgc.buflen > sizeof(track_information))
1375 cgc.buflen = sizeof(track_information);
1376
1377 cgc.cmd[8] = cgc.buflen;
1378 return pkt_generic_packet(pd, &cgc);
1379 }
1380
1381 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1382 {
1383 disc_information di;
1384 track_information ti;
1385 __u32 last_track;
1386 int ret = -1;
1387
1388 if ((ret = pkt_get_disc_info(pd, &di)))
1389 return ret;
1390
1391 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1392 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1393 return ret;
1394
1395 /* if this track is blank, try the previous. */
1396 if (ti.blank) {
1397 last_track--;
1398 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1399 return ret;
1400 }
1401
1402 /* if last recorded field is valid, return it. */
1403 if (ti.lra_v) {
1404 *last_written = be32_to_cpu(ti.last_rec_address);
1405 } else {
1406 /* make it up instead */
1407 *last_written = be32_to_cpu(ti.track_start) +
1408 be32_to_cpu(ti.track_size);
1409 if (ti.free_blocks)
1410 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1411 }
1412 return 0;
1413 }
1414
1415 /*
1416 * write mode select package based on pd->settings
1417 */
1418 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1419 {
1420 struct packet_command cgc;
1421 struct request_sense sense;
1422 write_param_page *wp;
1423 char buffer[128];
1424 int ret, size;
1425
1426 /* doesn't apply to DVD+RW or DVD-RAM */
1427 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1428 return 0;
1429
1430 memset(buffer, 0, sizeof(buffer));
1431 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1432 cgc.sense = &sense;
1433 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1434 pkt_dump_sense(&cgc);
1435 return ret;
1436 }
1437
1438 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1439 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1440 if (size > sizeof(buffer))
1441 size = sizeof(buffer);
1442
1443 /*
1444 * now get it all
1445 */
1446 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1447 cgc.sense = &sense;
1448 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1449 pkt_dump_sense(&cgc);
1450 return ret;
1451 }
1452
1453 /*
1454 * write page is offset header + block descriptor length
1455 */
1456 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1457
1458 wp->fp = pd->settings.fp;
1459 wp->track_mode = pd->settings.track_mode;
1460 wp->write_type = pd->settings.write_type;
1461 wp->data_block_type = pd->settings.block_mode;
1462
1463 wp->multi_session = 0;
1464
1465 #ifdef PACKET_USE_LS
1466 wp->link_size = 7;
1467 wp->ls_v = 1;
1468 #endif
1469
1470 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1471 wp->session_format = 0;
1472 wp->subhdr2 = 0x20;
1473 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1474 wp->session_format = 0x20;
1475 wp->subhdr2 = 8;
1476 #if 0
1477 wp->mcn[0] = 0x80;
1478 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1479 #endif
1480 } else {
1481 /*
1482 * paranoia
1483 */
1484 printk("pktcdvd: write mode wrong %d\n", wp->data_block_type);
1485 return 1;
1486 }
1487 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1488
1489 cgc.buflen = cgc.cmd[8] = size;
1490 if ((ret = pkt_mode_select(pd, &cgc))) {
1491 pkt_dump_sense(&cgc);
1492 return ret;
1493 }
1494
1495 pkt_print_settings(pd);
1496 return 0;
1497 }
1498
1499 /*
1500 * 0 -- we can write to this track, 1 -- we can't
1501 */
1502 static int pkt_good_track(track_information *ti)
1503 {
1504 /*
1505 * only good for CD-RW at the moment, not DVD-RW
1506 */
1507
1508 /*
1509 * FIXME: only for FP
1510 */
1511 if (ti->fp == 0)
1512 return 0;
1513
1514 /*
1515 * "good" settings as per Mt Fuji.
1516 */
1517 if (ti->rt == 0 && ti->blank == 0 && ti->packet == 1)
1518 return 0;
1519
1520 if (ti->rt == 0 && ti->blank == 1 && ti->packet == 1)
1521 return 0;
1522
1523 if (ti->rt == 1 && ti->blank == 0 && ti->packet == 1)
1524 return 0;
1525
1526 printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1527 return 1;
1528 }
1529
1530 /*
1531 * 0 -- we can write to this disc, 1 -- we can't
1532 */
1533 static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di)
1534 {
1535 switch (pd->mmc3_profile) {
1536 case 0x0a: /* CD-RW */
1537 case 0xffff: /* MMC3 not supported */
1538 break;
1539 case 0x1a: /* DVD+RW */
1540 case 0x13: /* DVD-RW */
1541 case 0x12: /* DVD-RAM */
1542 return 0;
1543 default:
1544 printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
1545 return 1;
1546 }
1547
1548 /*
1549 * for disc type 0xff we should probably reserve a new track.
1550 * but i'm not sure, should we leave this to user apps? probably.
1551 */
1552 if (di->disc_type == 0xff) {
1553 printk("pktcdvd: Unknown disc. No track?\n");
1554 return 1;
1555 }
1556
1557 if (di->disc_type != 0x20 && di->disc_type != 0) {
1558 printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type);
1559 return 1;
1560 }
1561
1562 if (di->erasable == 0) {
1563 printk("pktcdvd: Disc not erasable\n");
1564 return 1;
1565 }
1566
1567 if (di->border_status == PACKET_SESSION_RESERVED) {
1568 printk("pktcdvd: Can't write to last track (reserved)\n");
1569 return 1;
1570 }
1571
1572 return 0;
1573 }
1574
1575 static int pkt_probe_settings(struct pktcdvd_device *pd)
1576 {
1577 struct packet_command cgc;
1578 unsigned char buf[12];
1579 disc_information di;
1580 track_information ti;
1581 int ret, track;
1582
1583 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1584 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1585 cgc.cmd[8] = 8;
1586 ret = pkt_generic_packet(pd, &cgc);
1587 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1588
1589 memset(&di, 0, sizeof(disc_information));
1590 memset(&ti, 0, sizeof(track_information));
1591
1592 if ((ret = pkt_get_disc_info(pd, &di))) {
1593 printk("failed get_disc\n");
1594 return ret;
1595 }
1596
1597 if (pkt_good_disc(pd, &di))
1598 return -ENXIO;
1599
1600 switch (pd->mmc3_profile) {
1601 case 0x1a: /* DVD+RW */
1602 printk("pktcdvd: inserted media is DVD+RW\n");
1603 break;
1604 case 0x13: /* DVD-RW */
1605 printk("pktcdvd: inserted media is DVD-RW\n");
1606 break;
1607 case 0x12: /* DVD-RAM */
1608 printk("pktcdvd: inserted media is DVD-RAM\n");
1609 break;
1610 default:
1611 printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : "");
1612 break;
1613 }
1614 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1615
1616 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1617 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1618 printk("pktcdvd: failed get_track\n");
1619 return ret;
1620 }
1621
1622 if (pkt_good_track(&ti)) {
1623 printk("pktcdvd: can't write to this track\n");
1624 return -ENXIO;
1625 }
1626
1627 /*
1628 * we keep packet size in 512 byte units, makes it easier to
1629 * deal with request calculations.
1630 */
1631 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1632 if (pd->settings.size == 0) {
1633 printk("pktcdvd: detected zero packet size!\n");
1634 pd->settings.size = 128;
1635 }
1636 pd->settings.fp = ti.fp;
1637 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1638
1639 if (ti.nwa_v) {
1640 pd->nwa = be32_to_cpu(ti.next_writable);
1641 set_bit(PACKET_NWA_VALID, &pd->flags);
1642 }
1643
1644 /*
1645 * in theory we could use lra on -RW media as well and just zero
1646 * blocks that haven't been written yet, but in practice that
1647 * is just a no-go. we'll use that for -R, naturally.
1648 */
1649 if (ti.lra_v) {
1650 pd->lra = be32_to_cpu(ti.last_rec_address);
1651 set_bit(PACKET_LRA_VALID, &pd->flags);
1652 } else {
1653 pd->lra = 0xffffffff;
1654 set_bit(PACKET_LRA_VALID, &pd->flags);
1655 }
1656
1657 /*
1658 * fine for now
1659 */
1660 pd->settings.link_loss = 7;
1661 pd->settings.write_type = 0; /* packet */
1662 pd->settings.track_mode = ti.track_mode;
1663
1664 /*
1665 * mode1 or mode2 disc
1666 */
1667 switch (ti.data_mode) {
1668 case PACKET_MODE1:
1669 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1670 break;
1671 case PACKET_MODE2:
1672 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1673 break;
1674 default:
1675 printk("pktcdvd: unknown data mode\n");
1676 return 1;
1677 }
1678 return 0;
1679 }
1680
1681 /*
1682 * enable/disable write caching on drive
1683 */
1684 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
1685 {
1686 struct packet_command cgc;
1687 struct request_sense sense;
1688 unsigned char buf[64];
1689 int ret;
1690
1691 memset(buf, 0, sizeof(buf));
1692 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1693 cgc.sense = &sense;
1694 cgc.buflen = pd->mode_offset + 12;
1695
1696 /*
1697 * caching mode page might not be there, so quiet this command
1698 */
1699 cgc.quiet = 1;
1700
1701 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1702 return ret;
1703
1704 buf[pd->mode_offset + 10] |= (!!set << 2);
1705
1706 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1707 ret = pkt_mode_select(pd, &cgc);
1708 if (ret) {
1709 printk("pktcdvd: write caching control failed\n");
1710 pkt_dump_sense(&cgc);
1711 } else if (!ret && set)
1712 printk("pktcdvd: enabled write caching on %s\n", pd->name);
1713 return ret;
1714 }
1715
1716 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1717 {
1718 struct packet_command cgc;
1719
1720 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1721 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1722 cgc.cmd[4] = lockflag ? 1 : 0;
1723 return pkt_generic_packet(pd, &cgc);
1724 }
1725
1726 /*
1727 * Returns drive maximum write speed
1728 */
1729 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
1730 {
1731 struct packet_command cgc;
1732 struct request_sense sense;
1733 unsigned char buf[256+18];
1734 unsigned char *cap_buf;
1735 int ret, offset;
1736
1737 memset(buf, 0, sizeof(buf));
1738 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1739 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1740 cgc.sense = &sense;
1741
1742 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1743 if (ret) {
1744 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1745 sizeof(struct mode_page_header);
1746 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1747 if (ret) {
1748 pkt_dump_sense(&cgc);
1749 return ret;
1750 }
1751 }
1752
1753 offset = 20; /* Obsoleted field, used by older drives */
1754 if (cap_buf[1] >= 28)
1755 offset = 28; /* Current write speed selected */
1756 if (cap_buf[1] >= 30) {
1757 /* If the drive reports at least one "Logical Unit Write
1758 * Speed Performance Descriptor Block", use the information
1759 * in the first block. (contains the highest speed)
1760 */
1761 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1762 if (num_spdb > 0)
1763 offset = 34;
1764 }
1765
1766 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1767 return 0;
1768 }
1769
1770 /* These tables from cdrecord - I don't have orange book */
1771 /* standard speed CD-RW (1-4x) */
1772 static char clv_to_speed[16] = {
1773 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1774 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1775 };
1776 /* high speed CD-RW (-10x) */
1777 static char hs_clv_to_speed[16] = {
1778 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1779 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1780 };
1781 /* ultra high speed CD-RW */
1782 static char us_clv_to_speed[16] = {
1783 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1784 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
1785 };
1786
1787 /*
1788 * reads the maximum media speed from ATIP
1789 */
1790 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
1791 {
1792 struct packet_command cgc;
1793 struct request_sense sense;
1794 unsigned char buf[64];
1795 unsigned int size, st, sp;
1796 int ret;
1797
1798 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
1799 cgc.sense = &sense;
1800 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1801 cgc.cmd[1] = 2;
1802 cgc.cmd[2] = 4; /* READ ATIP */
1803 cgc.cmd[8] = 2;
1804 ret = pkt_generic_packet(pd, &cgc);
1805 if (ret) {
1806 pkt_dump_sense(&cgc);
1807 return ret;
1808 }
1809 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
1810 if (size > sizeof(buf))
1811 size = sizeof(buf);
1812
1813 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1814 cgc.sense = &sense;
1815 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1816 cgc.cmd[1] = 2;
1817 cgc.cmd[2] = 4;
1818 cgc.cmd[8] = size;
1819 ret = pkt_generic_packet(pd, &cgc);
1820 if (ret) {
1821 pkt_dump_sense(&cgc);
1822 return ret;
1823 }
1824
1825 if (!buf[6] & 0x40) {
1826 printk("pktcdvd: Disc type is not CD-RW\n");
1827 return 1;
1828 }
1829 if (!buf[6] & 0x4) {
1830 printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n");
1831 return 1;
1832 }
1833
1834 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
1835
1836 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
1837
1838 /* Info from cdrecord */
1839 switch (st) {
1840 case 0: /* standard speed */
1841 *speed = clv_to_speed[sp];
1842 break;
1843 case 1: /* high speed */
1844 *speed = hs_clv_to_speed[sp];
1845 break;
1846 case 2: /* ultra high speed */
1847 *speed = us_clv_to_speed[sp];
1848 break;
1849 default:
1850 printk("pktcdvd: Unknown disc sub-type %d\n",st);
1851 return 1;
1852 }
1853 if (*speed) {
1854 printk("pktcdvd: Max. media speed: %d\n",*speed);
1855 return 0;
1856 } else {
1857 printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st);
1858 return 1;
1859 }
1860 }
1861
1862 static int pkt_perform_opc(struct pktcdvd_device *pd)
1863 {
1864 struct packet_command cgc;
1865 struct request_sense sense;
1866 int ret;
1867
1868 VPRINTK("pktcdvd: Performing OPC\n");
1869
1870 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1871 cgc.sense = &sense;
1872 cgc.timeout = 60*HZ;
1873 cgc.cmd[0] = GPCMD_SEND_OPC;
1874 cgc.cmd[1] = 1;
1875 if ((ret = pkt_generic_packet(pd, &cgc)))
1876 pkt_dump_sense(&cgc);
1877 return ret;
1878 }
1879
1880 static int pkt_open_write(struct pktcdvd_device *pd)
1881 {
1882 int ret;
1883 unsigned int write_speed, media_write_speed, read_speed;
1884
1885 if ((ret = pkt_probe_settings(pd))) {
1886 DPRINTK("pktcdvd: %s failed probe\n", pd->name);
1887 return -EIO;
1888 }
1889
1890 if ((ret = pkt_set_write_settings(pd))) {
1891 DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name);
1892 return -EIO;
1893 }
1894
1895 pkt_write_caching(pd, USE_WCACHING);
1896
1897 if ((ret = pkt_get_max_speed(pd, &write_speed)))
1898 write_speed = 16 * 177;
1899 switch (pd->mmc3_profile) {
1900 case 0x13: /* DVD-RW */
1901 case 0x1a: /* DVD+RW */
1902 case 0x12: /* DVD-RAM */
1903 DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
1904 break;
1905 default:
1906 if ((ret = pkt_media_speed(pd, &media_write_speed)))
1907 media_write_speed = 16;
1908 write_speed = min(write_speed, media_write_speed * 177);
1909 DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176);
1910 break;
1911 }
1912 read_speed = write_speed;
1913
1914 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
1915 DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
1916 return -EIO;
1917 }
1918 pd->write_speed = write_speed;
1919 pd->read_speed = read_speed;
1920
1921 if ((ret = pkt_perform_opc(pd))) {
1922 DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name);
1923 }
1924
1925 return 0;
1926 }
1927
1928 /*
1929 * called at open time.
1930 */
1931 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
1932 {
1933 int ret;
1934 long lba;
1935 request_queue_t *q;
1936
1937 /*
1938 * We need to re-open the cdrom device without O_NONBLOCK to be able
1939 * to read/write from/to it. It is already opened in O_NONBLOCK mode
1940 * so bdget() can't fail.
1941 */
1942 bdget(pd->bdev->bd_dev);
1943 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
1944 goto out;
1945
1946 if ((ret = pkt_get_last_written(pd, &lba))) {
1947 printk("pktcdvd: pkt_get_last_written failed\n");
1948 goto out_putdev;
1949 }
1950
1951 set_capacity(pd->disk, lba << 2);
1952 set_capacity(pd->bdev->bd_disk, lba << 2);
1953 bd_set_size(pd->bdev, (loff_t)lba << 11);
1954
1955 q = bdev_get_queue(pd->bdev);
1956 if (write) {
1957 if ((ret = pkt_open_write(pd)))
1958 goto out_putdev;
1959 /*
1960 * Some CDRW drives can not handle writes larger than one packet,
1961 * even if the size is a multiple of the packet size.
1962 */
1963 spin_lock_irq(q->queue_lock);
1964 blk_queue_max_sectors(q, pd->settings.size);
1965 spin_unlock_irq(q->queue_lock);
1966 set_bit(PACKET_WRITABLE, &pd->flags);
1967 } else {
1968 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1969 clear_bit(PACKET_WRITABLE, &pd->flags);
1970 }
1971
1972 if ((ret = pkt_set_segment_merging(pd, q)))
1973 goto out_putdev;
1974
1975 if (write)
1976 printk("pktcdvd: %lukB available on disc\n", lba << 1);
1977
1978 return 0;
1979
1980 out_putdev:
1981 blkdev_put(pd->bdev);
1982 out:
1983 return ret;
1984 }
1985
1986 /*
1987 * called when the device is closed. makes sure that the device flushes
1988 * the internal cache before we close.
1989 */
1990 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
1991 {
1992 if (flush && pkt_flush_cache(pd))
1993 DPRINTK("pktcdvd: %s not flushing cache\n", pd->name);
1994
1995 pkt_lock_door(pd, 0);
1996
1997 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1998 blkdev_put(pd->bdev);
1999 }
2000
2001 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2002 {
2003 if (dev_minor >= MAX_WRITERS)
2004 return NULL;
2005 return pkt_devs[dev_minor];
2006 }
2007
2008 static int pkt_open(struct inode *inode, struct file *file)
2009 {
2010 struct pktcdvd_device *pd = NULL;
2011 int ret;
2012
2013 VPRINTK("pktcdvd: entering open\n");
2014
2015 down(&ctl_mutex);
2016 pd = pkt_find_dev_from_minor(iminor(inode));
2017 if (!pd) {
2018 ret = -ENODEV;
2019 goto out;
2020 }
2021 BUG_ON(pd->refcnt < 0);
2022
2023 pd->refcnt++;
2024 if (pd->refcnt == 1) {
2025 if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) {
2026 ret = -EIO;
2027 goto out_dec;
2028 }
2029 /*
2030 * needed here as well, since ext2 (among others) may change
2031 * the blocksize at mount time
2032 */
2033 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2034 }
2035
2036 up(&ctl_mutex);
2037 return 0;
2038
2039 out_dec:
2040 pd->refcnt--;
2041 out:
2042 VPRINTK("pktcdvd: failed open (%d)\n", ret);
2043 up(&ctl_mutex);
2044 return ret;
2045 }
2046
2047 static int pkt_close(struct inode *inode, struct file *file)
2048 {
2049 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2050 int ret = 0;
2051
2052 down(&ctl_mutex);
2053 pd->refcnt--;
2054 BUG_ON(pd->refcnt < 0);
2055 if (pd->refcnt == 0) {
2056 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2057 pkt_release_dev(pd, flush);
2058 }
2059 up(&ctl_mutex);
2060 return ret;
2061 }
2062
2063
2064 static void *psd_pool_alloc(unsigned int __nocast gfp_mask, void *data)
2065 {
2066 return kmalloc(sizeof(struct packet_stacked_data), gfp_mask);
2067 }
2068
2069 static void psd_pool_free(void *ptr, void *data)
2070 {
2071 kfree(ptr);
2072 }
2073
2074 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2075 {
2076 struct packet_stacked_data *psd = bio->bi_private;
2077 struct pktcdvd_device *pd = psd->pd;
2078
2079 if (bio->bi_size)
2080 return 1;
2081
2082 bio_put(bio);
2083 bio_endio(psd->bio, psd->bio->bi_size, err);
2084 mempool_free(psd, psd_pool);
2085 pkt_bio_finished(pd);
2086 return 0;
2087 }
2088
2089 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2090 {
2091 struct pktcdvd_device *pd;
2092 char b[BDEVNAME_SIZE];
2093 sector_t zone;
2094 struct packet_data *pkt;
2095 int was_empty, blocked_bio;
2096 struct pkt_rb_node *node;
2097
2098 pd = q->queuedata;
2099 if (!pd) {
2100 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2101 goto end_io;
2102 }
2103
2104 /*
2105 * Clone READ bios so we can have our own bi_end_io callback.
2106 */
2107 if (bio_data_dir(bio) == READ) {
2108 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2109 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2110
2111 psd->pd = pd;
2112 psd->bio = bio;
2113 cloned_bio->bi_bdev = pd->bdev;
2114 cloned_bio->bi_private = psd;
2115 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2116 pd->stats.secs_r += bio->bi_size >> 9;
2117 pkt_queue_bio(pd, cloned_bio, 1);
2118 return 0;
2119 }
2120
2121 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2122 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2123 pd->name, (unsigned long long)bio->bi_sector);
2124 goto end_io;
2125 }
2126
2127 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2128 printk("pktcdvd: wrong bio size\n");
2129 goto end_io;
2130 }
2131
2132 blk_queue_bounce(q, &bio);
2133
2134 zone = ZONE(bio->bi_sector, pd);
2135 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2136 (unsigned long long)bio->bi_sector,
2137 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2138
2139 /* Check if we have to split the bio */
2140 {
2141 struct bio_pair *bp;
2142 sector_t last_zone;
2143 int first_sectors;
2144
2145 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2146 if (last_zone != zone) {
2147 BUG_ON(last_zone != zone + pd->settings.size);
2148 first_sectors = last_zone - bio->bi_sector;
2149 bp = bio_split(bio, bio_split_pool, first_sectors);
2150 BUG_ON(!bp);
2151 pkt_make_request(q, &bp->bio1);
2152 pkt_make_request(q, &bp->bio2);
2153 bio_pair_release(bp);
2154 return 0;
2155 }
2156 }
2157
2158 /*
2159 * If we find a matching packet in state WAITING or READ_WAIT, we can
2160 * just append this bio to that packet.
2161 */
2162 spin_lock(&pd->cdrw.active_list_lock);
2163 blocked_bio = 0;
2164 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2165 if (pkt->sector == zone) {
2166 spin_lock(&pkt->lock);
2167 if ((pkt->state == PACKET_WAITING_STATE) ||
2168 (pkt->state == PACKET_READ_WAIT_STATE)) {
2169 pkt_add_list_last(bio, &pkt->orig_bios,
2170 &pkt->orig_bios_tail);
2171 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2172 if ((pkt->write_size >= pkt->frames) &&
2173 (pkt->state == PACKET_WAITING_STATE)) {
2174 atomic_inc(&pkt->run_sm);
2175 wake_up(&pd->wqueue);
2176 }
2177 spin_unlock(&pkt->lock);
2178 spin_unlock(&pd->cdrw.active_list_lock);
2179 return 0;
2180 } else {
2181 blocked_bio = 1;
2182 }
2183 spin_unlock(&pkt->lock);
2184 }
2185 }
2186 spin_unlock(&pd->cdrw.active_list_lock);
2187
2188 /*
2189 * No matching packet found. Store the bio in the work queue.
2190 */
2191 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2192 BUG_ON(!node);
2193 node->bio = bio;
2194 spin_lock(&pd->lock);
2195 BUG_ON(pd->bio_queue_size < 0);
2196 was_empty = (pd->bio_queue_size == 0);
2197 pkt_rbtree_insert(pd, node);
2198 spin_unlock(&pd->lock);
2199
2200 /*
2201 * Wake up the worker thread.
2202 */
2203 atomic_set(&pd->scan_queue, 1);
2204 if (was_empty) {
2205 /* This wake_up is required for correct operation */
2206 wake_up(&pd->wqueue);
2207 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2208 /*
2209 * This wake up is not required for correct operation,
2210 * but improves performance in some cases.
2211 */
2212 wake_up(&pd->wqueue);
2213 }
2214 return 0;
2215 end_io:
2216 bio_io_error(bio, bio->bi_size);
2217 return 0;
2218 }
2219
2220
2221
2222 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2223 {
2224 struct pktcdvd_device *pd = q->queuedata;
2225 sector_t zone = ZONE(bio->bi_sector, pd);
2226 int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2227 int remaining = (pd->settings.size << 9) - used;
2228 int remaining2;
2229
2230 /*
2231 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2232 * boundary, pkt_make_request() will split the bio.
2233 */
2234 remaining2 = PAGE_SIZE - bio->bi_size;
2235 remaining = max(remaining, remaining2);
2236
2237 BUG_ON(remaining < 0);
2238 return remaining;
2239 }
2240
2241 static void pkt_init_queue(struct pktcdvd_device *pd)
2242 {
2243 request_queue_t *q = pd->disk->queue;
2244
2245 blk_queue_make_request(q, pkt_make_request);
2246 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2247 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2248 blk_queue_merge_bvec(q, pkt_merge_bvec);
2249 q->queuedata = pd;
2250 }
2251
2252 static int pkt_seq_show(struct seq_file *m, void *p)
2253 {
2254 struct pktcdvd_device *pd = m->private;
2255 char *msg;
2256 char bdev_buf[BDEVNAME_SIZE];
2257 int states[PACKET_NUM_STATES];
2258
2259 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2260 bdevname(pd->bdev, bdev_buf));
2261
2262 seq_printf(m, "\nSettings:\n");
2263 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2264
2265 if (pd->settings.write_type == 0)
2266 msg = "Packet";
2267 else
2268 msg = "Unknown";
2269 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2270
2271 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2272 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2273
2274 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2275
2276 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2277 msg = "Mode 1";
2278 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2279 msg = "Mode 2";
2280 else
2281 msg = "Unknown";
2282 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2283
2284 seq_printf(m, "\nStatistics:\n");
2285 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2286 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2287 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2288 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2289 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2290
2291 seq_printf(m, "\nMisc:\n");
2292 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2293 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2294 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2295 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2296 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2297 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2298
2299 seq_printf(m, "\nQueue state:\n");
2300 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2301 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2302 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2303
2304 pkt_count_states(pd, states);
2305 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2306 states[0], states[1], states[2], states[3], states[4], states[5]);
2307
2308 return 0;
2309 }
2310
2311 static int pkt_seq_open(struct inode *inode, struct file *file)
2312 {
2313 return single_open(file, pkt_seq_show, PDE(inode)->data);
2314 }
2315
2316 static struct file_operations pkt_proc_fops = {
2317 .open = pkt_seq_open,
2318 .read = seq_read,
2319 .llseek = seq_lseek,
2320 .release = single_release
2321 };
2322
2323 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2324 {
2325 int i;
2326 int ret = 0;
2327 char b[BDEVNAME_SIZE];
2328 struct proc_dir_entry *proc;
2329 struct block_device *bdev;
2330
2331 if (pd->pkt_dev == dev) {
2332 printk("pktcdvd: Recursive setup not allowed\n");
2333 return -EBUSY;
2334 }
2335 for (i = 0; i < MAX_WRITERS; i++) {
2336 struct pktcdvd_device *pd2 = pkt_devs[i];
2337 if (!pd2)
2338 continue;
2339 if (pd2->bdev->bd_dev == dev) {
2340 printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b));
2341 return -EBUSY;
2342 }
2343 if (pd2->pkt_dev == dev) {
2344 printk("pktcdvd: Can't chain pktcdvd devices\n");
2345 return -EBUSY;
2346 }
2347 }
2348
2349 bdev = bdget(dev);
2350 if (!bdev)
2351 return -ENOMEM;
2352 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2353 if (ret)
2354 return ret;
2355
2356 /* This is safe, since we have a reference from open(). */
2357 __module_get(THIS_MODULE);
2358
2359 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2360 printk("pktcdvd: not enough memory for buffers\n");
2361 ret = -ENOMEM;
2362 goto out_mem;
2363 }
2364
2365 pd->bdev = bdev;
2366 set_blocksize(bdev, CD_FRAMESIZE);
2367
2368 pkt_init_queue(pd);
2369
2370 atomic_set(&pd->cdrw.pending_bios, 0);
2371 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2372 if (IS_ERR(pd->cdrw.thread)) {
2373 printk("pktcdvd: can't start kernel thread\n");
2374 ret = -ENOMEM;
2375 goto out_thread;
2376 }
2377
2378 proc = create_proc_entry(pd->name, 0, pkt_proc);
2379 if (proc) {
2380 proc->data = pd;
2381 proc->proc_fops = &pkt_proc_fops;
2382 }
2383 DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2384 return 0;
2385
2386 out_thread:
2387 pkt_shrink_pktlist(pd);
2388 out_mem:
2389 blkdev_put(bdev);
2390 /* This is safe: open() is still holding a reference. */
2391 module_put(THIS_MODULE);
2392 return ret;
2393 }
2394
2395 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2396 {
2397 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2398
2399 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2400 BUG_ON(!pd);
2401
2402 switch (cmd) {
2403 /*
2404 * forward selected CDROM ioctls to CD-ROM, for UDF
2405 */
2406 case CDROMMULTISESSION:
2407 case CDROMREADTOCENTRY:
2408 case CDROM_LAST_WRITTEN:
2409 case CDROM_SEND_PACKET:
2410 case SCSI_IOCTL_SEND_COMMAND:
2411 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2412
2413 case CDROMEJECT:
2414 /*
2415 * The door gets locked when the device is opened, so we
2416 * have to unlock it or else the eject command fails.
2417 */
2418 pkt_lock_door(pd, 0);
2419 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2420
2421 default:
2422 printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);
2423 return -ENOTTY;
2424 }
2425
2426 return 0;
2427 }
2428
2429 static int pkt_media_changed(struct gendisk *disk)
2430 {
2431 struct pktcdvd_device *pd = disk->private_data;
2432 struct gendisk *attached_disk;
2433
2434 if (!pd)
2435 return 0;
2436 if (!pd->bdev)
2437 return 0;
2438 attached_disk = pd->bdev->bd_disk;
2439 if (!attached_disk)
2440 return 0;
2441 return attached_disk->fops->media_changed(attached_disk);
2442 }
2443
2444 static struct block_device_operations pktcdvd_ops = {
2445 .owner = THIS_MODULE,
2446 .open = pkt_open,
2447 .release = pkt_close,
2448 .ioctl = pkt_ioctl,
2449 .media_changed = pkt_media_changed,
2450 };
2451
2452 /*
2453 * Set up mapping from pktcdvd device to CD-ROM device.
2454 */
2455 static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd)
2456 {
2457 int idx;
2458 int ret = -ENOMEM;
2459 struct pktcdvd_device *pd;
2460 struct gendisk *disk;
2461 dev_t dev = new_decode_dev(ctrl_cmd->dev);
2462
2463 for (idx = 0; idx < MAX_WRITERS; idx++)
2464 if (!pkt_devs[idx])
2465 break;
2466 if (idx == MAX_WRITERS) {
2467 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS);
2468 return -EBUSY;
2469 }
2470
2471 pd = kmalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2472 if (!pd)
2473 return ret;
2474 memset(pd, 0, sizeof(struct pktcdvd_device));
2475
2476 pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL);
2477 if (!pd->rb_pool)
2478 goto out_mem;
2479
2480 disk = alloc_disk(1);
2481 if (!disk)
2482 goto out_mem;
2483 pd->disk = disk;
2484
2485 spin_lock_init(&pd->lock);
2486 spin_lock_init(&pd->iosched.lock);
2487 sprintf(pd->name, "pktcdvd%d", idx);
2488 init_waitqueue_head(&pd->wqueue);
2489 pd->bio_queue = RB_ROOT;
2490
2491 disk->major = pkt_major;
2492 disk->first_minor = idx;
2493 disk->fops = &pktcdvd_ops;
2494 disk->flags = GENHD_FL_REMOVABLE;
2495 sprintf(disk->disk_name, "pktcdvd%d", idx);
2496 disk->private_data = pd;
2497 disk->queue = blk_alloc_queue(GFP_KERNEL);
2498 if (!disk->queue)
2499 goto out_mem2;
2500
2501 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2502 ret = pkt_new_dev(pd, dev);
2503 if (ret)
2504 goto out_new_dev;
2505
2506 add_disk(disk);
2507 pkt_devs[idx] = pd;
2508 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2509 return 0;
2510
2511 out_new_dev:
2512 blk_put_queue(disk->queue);
2513 out_mem2:
2514 put_disk(disk);
2515 out_mem:
2516 if (pd->rb_pool)
2517 mempool_destroy(pd->rb_pool);
2518 kfree(pd);
2519 return ret;
2520 }
2521
2522 /*
2523 * Tear down mapping from pktcdvd device to CD-ROM device.
2524 */
2525 static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd)
2526 {
2527 struct pktcdvd_device *pd;
2528 int idx;
2529 dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev);
2530
2531 for (idx = 0; idx < MAX_WRITERS; idx++) {
2532 pd = pkt_devs[idx];
2533 if (pd && (pd->pkt_dev == pkt_dev))
2534 break;
2535 }
2536 if (idx == MAX_WRITERS) {
2537 DPRINTK("pktcdvd: dev not setup\n");
2538 return -ENXIO;
2539 }
2540
2541 if (pd->refcnt > 0)
2542 return -EBUSY;
2543
2544 if (!IS_ERR(pd->cdrw.thread))
2545 kthread_stop(pd->cdrw.thread);
2546
2547 blkdev_put(pd->bdev);
2548
2549 pkt_shrink_pktlist(pd);
2550
2551 remove_proc_entry(pd->name, pkt_proc);
2552 DPRINTK("pktcdvd: writer %s unmapped\n", pd->name);
2553
2554 del_gendisk(pd->disk);
2555 blk_put_queue(pd->disk->queue);
2556 put_disk(pd->disk);
2557
2558 pkt_devs[idx] = NULL;
2559 mempool_destroy(pd->rb_pool);
2560 kfree(pd);
2561
2562 /* This is safe: open() is still holding a reference. */
2563 module_put(THIS_MODULE);
2564 return 0;
2565 }
2566
2567 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2568 {
2569 struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2570 if (pd) {
2571 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2572 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2573 } else {
2574 ctrl_cmd->dev = 0;
2575 ctrl_cmd->pkt_dev = 0;
2576 }
2577 ctrl_cmd->num_devices = MAX_WRITERS;
2578 }
2579
2580 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2581 {
2582 void __user *argp = (void __user *)arg;
2583 struct pkt_ctrl_command ctrl_cmd;
2584 int ret = 0;
2585
2586 if (cmd != PACKET_CTRL_CMD)
2587 return -ENOTTY;
2588
2589 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2590 return -EFAULT;
2591
2592 switch (ctrl_cmd.command) {
2593 case PKT_CTRL_CMD_SETUP:
2594 if (!capable(CAP_SYS_ADMIN))
2595 return -EPERM;
2596 down(&ctl_mutex);
2597 ret = pkt_setup_dev(&ctrl_cmd);
2598 up(&ctl_mutex);
2599 break;
2600 case PKT_CTRL_CMD_TEARDOWN:
2601 if (!capable(CAP_SYS_ADMIN))
2602 return -EPERM;
2603 down(&ctl_mutex);
2604 ret = pkt_remove_dev(&ctrl_cmd);
2605 up(&ctl_mutex);
2606 break;
2607 case PKT_CTRL_CMD_STATUS:
2608 down(&ctl_mutex);
2609 pkt_get_status(&ctrl_cmd);
2610 up(&ctl_mutex);
2611 break;
2612 default:
2613 return -ENOTTY;
2614 }
2615
2616 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2617 return -EFAULT;
2618 return ret;
2619 }
2620
2621
2622 static struct file_operations pkt_ctl_fops = {
2623 .ioctl = pkt_ctl_ioctl,
2624 .owner = THIS_MODULE,
2625 };
2626
2627 static struct miscdevice pkt_misc = {
2628 .minor = MISC_DYNAMIC_MINOR,
2629 .name = "pktcdvd",
2630 .devfs_name = "pktcdvd/control",
2631 .fops = &pkt_ctl_fops
2632 };
2633
2634 static int __init pkt_init(void)
2635 {
2636 int ret;
2637
2638 psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL);
2639 if (!psd_pool)
2640 return -ENOMEM;
2641
2642 ret = register_blkdev(pkt_major, "pktcdvd");
2643 if (ret < 0) {
2644 printk("pktcdvd: Unable to register block device\n");
2645 goto out2;
2646 }
2647 if (!pkt_major)
2648 pkt_major = ret;
2649
2650 ret = misc_register(&pkt_misc);
2651 if (ret) {
2652 printk("pktcdvd: Unable to register misc device\n");
2653 goto out;
2654 }
2655
2656 init_MUTEX(&ctl_mutex);
2657
2658 pkt_proc = proc_mkdir("pktcdvd", proc_root_driver);
2659
2660 DPRINTK("pktcdvd: %s\n", VERSION_CODE);
2661 return 0;
2662
2663 out:
2664 unregister_blkdev(pkt_major, "pktcdvd");
2665 out2:
2666 mempool_destroy(psd_pool);
2667 return ret;
2668 }
2669
2670 static void __exit pkt_exit(void)
2671 {
2672 remove_proc_entry("pktcdvd", proc_root_driver);
2673 misc_deregister(&pkt_misc);
2674 unregister_blkdev(pkt_major, "pktcdvd");
2675 mempool_destroy(psd_pool);
2676 }
2677
2678 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2679 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2680 MODULE_LICENSE("GPL");
2681
2682 module_init(pkt_init);
2683 module_exit(pkt_exit);
Verdex Pro support