Automatic merge of /spare/repo/netdev-2.6 branch orinoco-hch
[linux-2.6] / 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                                 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 ((file->f_mode & FMODE_WRITE) &&
2026                     !test_bit(PACKET_WRITABLE, &pd->flags)) {
2027                         ret = -EBUSY;
2028                         goto out_dec;
2029                 }
2030         } else {
2031                 if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) {
2032                         ret = -EIO;
2033                         goto out_dec;
2034                 }
2035                 /*
2036                  * needed here as well, since ext2 (among others) may change
2037                  * the blocksize at mount time
2038                  */
2039                 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2040         }
2041
2042         up(&ctl_mutex);
2043         return 0;
2044
2045 out_dec:
2046         pd->refcnt--;
2047 out:
2048         VPRINTK("pktcdvd: failed open (%d)\n", ret);
2049         up(&ctl_mutex);
2050         return ret;
2051 }
2052
2053 static int pkt_close(struct inode *inode, struct file *file)
2054 {
2055         struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2056         int ret = 0;
2057
2058         down(&ctl_mutex);
2059         pd->refcnt--;
2060         BUG_ON(pd->refcnt < 0);
2061         if (pd->refcnt == 0) {
2062                 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2063                 pkt_release_dev(pd, flush);
2064         }
2065         up(&ctl_mutex);
2066         return ret;
2067 }
2068
2069
2070 static void *psd_pool_alloc(unsigned int __nocast gfp_mask, void *data)
2071 {
2072         return kmalloc(sizeof(struct packet_stacked_data), gfp_mask);
2073 }
2074
2075 static void psd_pool_free(void *ptr, void *data)
2076 {
2077         kfree(ptr);
2078 }
2079
2080 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2081 {
2082         struct packet_stacked_data *psd = bio->bi_private;
2083         struct pktcdvd_device *pd = psd->pd;
2084
2085         if (bio->bi_size)
2086                 return 1;
2087
2088         bio_put(bio);
2089         bio_endio(psd->bio, psd->bio->bi_size, err);
2090         mempool_free(psd, psd_pool);
2091         pkt_bio_finished(pd);
2092         return 0;
2093 }
2094
2095 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2096 {
2097         struct pktcdvd_device *pd;
2098         char b[BDEVNAME_SIZE];
2099         sector_t zone;
2100         struct packet_data *pkt;
2101         int was_empty, blocked_bio;
2102         struct pkt_rb_node *node;
2103
2104         pd = q->queuedata;
2105         if (!pd) {
2106                 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2107                 goto end_io;
2108         }
2109
2110         /*
2111          * Clone READ bios so we can have our own bi_end_io callback.
2112          */
2113         if (bio_data_dir(bio) == READ) {
2114                 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2115                 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2116
2117                 psd->pd = pd;
2118                 psd->bio = bio;
2119                 cloned_bio->bi_bdev = pd->bdev;
2120                 cloned_bio->bi_private = psd;
2121                 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2122                 pd->stats.secs_r += bio->bi_size >> 9;
2123                 pkt_queue_bio(pd, cloned_bio, 1);
2124                 return 0;
2125         }
2126
2127         if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2128                 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2129                         pd->name, (unsigned long long)bio->bi_sector);
2130                 goto end_io;
2131         }
2132
2133         if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2134                 printk("pktcdvd: wrong bio size\n");
2135                 goto end_io;
2136         }
2137
2138         blk_queue_bounce(q, &bio);
2139
2140         zone = ZONE(bio->bi_sector, pd);
2141         VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2142                 (unsigned long long)bio->bi_sector,
2143                 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2144
2145         /* Check if we have to split the bio */
2146         {
2147                 struct bio_pair *bp;
2148                 sector_t last_zone;
2149                 int first_sectors;
2150
2151                 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2152                 if (last_zone != zone) {
2153                         BUG_ON(last_zone != zone + pd->settings.size);
2154                         first_sectors = last_zone - bio->bi_sector;
2155                         bp = bio_split(bio, bio_split_pool, first_sectors);
2156                         BUG_ON(!bp);
2157                         pkt_make_request(q, &bp->bio1);
2158                         pkt_make_request(q, &bp->bio2);
2159                         bio_pair_release(bp);
2160                         return 0;
2161                 }
2162         }
2163
2164         /*
2165          * If we find a matching packet in state WAITING or READ_WAIT, we can
2166          * just append this bio to that packet.
2167          */
2168         spin_lock(&pd->cdrw.active_list_lock);
2169         blocked_bio = 0;
2170         list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2171                 if (pkt->sector == zone) {
2172                         spin_lock(&pkt->lock);
2173                         if ((pkt->state == PACKET_WAITING_STATE) ||
2174                             (pkt->state == PACKET_READ_WAIT_STATE)) {
2175                                 pkt_add_list_last(bio, &pkt->orig_bios,
2176                                                   &pkt->orig_bios_tail);
2177                                 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2178                                 if ((pkt->write_size >= pkt->frames) &&
2179                                     (pkt->state == PACKET_WAITING_STATE)) {
2180                                         atomic_inc(&pkt->run_sm);
2181                                         wake_up(&pd->wqueue);
2182                                 }
2183                                 spin_unlock(&pkt->lock);
2184                                 spin_unlock(&pd->cdrw.active_list_lock);
2185                                 return 0;
2186                         } else {
2187                                 blocked_bio = 1;
2188                         }
2189                         spin_unlock(&pkt->lock);
2190                 }
2191         }
2192         spin_unlock(&pd->cdrw.active_list_lock);
2193
2194         /*
2195          * No matching packet found. Store the bio in the work queue.
2196          */
2197         node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2198         BUG_ON(!node);
2199         node->bio = bio;
2200         spin_lock(&pd->lock);
2201         BUG_ON(pd->bio_queue_size < 0);
2202         was_empty = (pd->bio_queue_size == 0);
2203         pkt_rbtree_insert(pd, node);
2204         spin_unlock(&pd->lock);
2205
2206         /*
2207          * Wake up the worker thread.
2208          */
2209         atomic_set(&pd->scan_queue, 1);
2210         if (was_empty) {
2211                 /* This wake_up is required for correct operation */
2212                 wake_up(&pd->wqueue);
2213         } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2214                 /*
2215                  * This wake up is not required for correct operation,
2216                  * but improves performance in some cases.
2217                  */
2218                 wake_up(&pd->wqueue);
2219         }
2220         return 0;
2221 end_io:
2222         bio_io_error(bio, bio->bi_size);
2223         return 0;
2224 }
2225
2226
2227
2228 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2229 {
2230         struct pktcdvd_device *pd = q->queuedata;
2231         sector_t zone = ZONE(bio->bi_sector, pd);
2232         int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2233         int remaining = (pd->settings.size << 9) - used;
2234         int remaining2;
2235
2236         /*
2237          * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2238          * boundary, pkt_make_request() will split the bio.
2239          */
2240         remaining2 = PAGE_SIZE - bio->bi_size;
2241         remaining = max(remaining, remaining2);
2242
2243         BUG_ON(remaining < 0);
2244         return remaining;
2245 }
2246
2247 static void pkt_init_queue(struct pktcdvd_device *pd)
2248 {
2249         request_queue_t *q = pd->disk->queue;
2250
2251         blk_queue_make_request(q, pkt_make_request);
2252         blk_queue_hardsect_size(q, CD_FRAMESIZE);
2253         blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2254         blk_queue_merge_bvec(q, pkt_merge_bvec);
2255         q->queuedata = pd;
2256 }
2257
2258 static int pkt_seq_show(struct seq_file *m, void *p)
2259 {
2260         struct pktcdvd_device *pd = m->private;
2261         char *msg;
2262         char bdev_buf[BDEVNAME_SIZE];
2263         int states[PACKET_NUM_STATES];
2264
2265         seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2266                    bdevname(pd->bdev, bdev_buf));
2267
2268         seq_printf(m, "\nSettings:\n");
2269         seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2270
2271         if (pd->settings.write_type == 0)
2272                 msg = "Packet";
2273         else
2274                 msg = "Unknown";
2275         seq_printf(m, "\twrite type:\t\t%s\n", msg);
2276
2277         seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2278         seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2279
2280         seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2281
2282         if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2283                 msg = "Mode 1";
2284         else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2285                 msg = "Mode 2";
2286         else
2287                 msg = "Unknown";
2288         seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2289
2290         seq_printf(m, "\nStatistics:\n");
2291         seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2292         seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2293         seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2294         seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2295         seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2296
2297         seq_printf(m, "\nMisc:\n");
2298         seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2299         seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2300         seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2301         seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2302         seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2303         seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2304
2305         seq_printf(m, "\nQueue state:\n");
2306         seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2307         seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2308         seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2309
2310         pkt_count_states(pd, states);
2311         seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2312                    states[0], states[1], states[2], states[3], states[4], states[5]);
2313
2314         return 0;
2315 }
2316
2317 static int pkt_seq_open(struct inode *inode, struct file *file)
2318 {
2319         return single_open(file, pkt_seq_show, PDE(inode)->data);
2320 }
2321
2322 static struct file_operations pkt_proc_fops = {
2323         .open   = pkt_seq_open,
2324         .read   = seq_read,
2325         .llseek = seq_lseek,
2326         .release = single_release
2327 };
2328
2329 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2330 {
2331         int i;
2332         int ret = 0;
2333         char b[BDEVNAME_SIZE];
2334         struct proc_dir_entry *proc;
2335         struct block_device *bdev;
2336
2337         if (pd->pkt_dev == dev) {
2338                 printk("pktcdvd: Recursive setup not allowed\n");
2339                 return -EBUSY;
2340         }
2341         for (i = 0; i < MAX_WRITERS; i++) {
2342                 struct pktcdvd_device *pd2 = pkt_devs[i];
2343                 if (!pd2)
2344                         continue;
2345                 if (pd2->bdev->bd_dev == dev) {
2346                         printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b));
2347                         return -EBUSY;
2348                 }
2349                 if (pd2->pkt_dev == dev) {
2350                         printk("pktcdvd: Can't chain pktcdvd devices\n");
2351                         return -EBUSY;
2352                 }
2353         }
2354
2355         bdev = bdget(dev);
2356         if (!bdev)
2357                 return -ENOMEM;
2358         ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2359         if (ret)
2360                 return ret;
2361
2362         /* This is safe, since we have a reference from open(). */
2363         __module_get(THIS_MODULE);
2364
2365         if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2366                 printk("pktcdvd: not enough memory for buffers\n");
2367                 ret = -ENOMEM;
2368                 goto out_mem;
2369         }
2370
2371         pd->bdev = bdev;
2372         set_blocksize(bdev, CD_FRAMESIZE);
2373
2374         pkt_init_queue(pd);
2375
2376         atomic_set(&pd->cdrw.pending_bios, 0);
2377         pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2378         if (IS_ERR(pd->cdrw.thread)) {
2379                 printk("pktcdvd: can't start kernel thread\n");
2380                 ret = -ENOMEM;
2381                 goto out_thread;
2382         }
2383
2384         proc = create_proc_entry(pd->name, 0, pkt_proc);
2385         if (proc) {
2386                 proc->data = pd;
2387                 proc->proc_fops = &pkt_proc_fops;
2388         }
2389         DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2390         return 0;
2391
2392 out_thread:
2393         pkt_shrink_pktlist(pd);
2394 out_mem:
2395         blkdev_put(bdev);
2396         /* This is safe: open() is still holding a reference. */
2397         module_put(THIS_MODULE);
2398         return ret;
2399 }
2400
2401 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2402 {
2403         struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2404
2405         VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2406         BUG_ON(!pd);
2407
2408         switch (cmd) {
2409         /*
2410          * forward selected CDROM ioctls to CD-ROM, for UDF
2411          */
2412         case CDROMMULTISESSION:
2413         case CDROMREADTOCENTRY:
2414         case CDROM_LAST_WRITTEN:
2415         case CDROM_SEND_PACKET:
2416         case SCSI_IOCTL_SEND_COMMAND:
2417                 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2418
2419         case CDROMEJECT:
2420                 /*
2421                  * The door gets locked when the device is opened, so we
2422                  * have to unlock it or else the eject command fails.
2423                  */
2424                 pkt_lock_door(pd, 0);
2425                 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2426
2427         default:
2428                 printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);
2429                 return -ENOTTY;
2430         }
2431
2432         return 0;
2433 }
2434
2435 static int pkt_media_changed(struct gendisk *disk)
2436 {
2437         struct pktcdvd_device *pd = disk->private_data;
2438         struct gendisk *attached_disk;
2439
2440         if (!pd)
2441                 return 0;
2442         if (!pd->bdev)
2443                 return 0;
2444         attached_disk = pd->bdev->bd_disk;
2445         if (!attached_disk)
2446                 return 0;
2447         return attached_disk->fops->media_changed(attached_disk);
2448 }
2449
2450 static struct block_device_operations pktcdvd_ops = {
2451         .owner =                THIS_MODULE,
2452         .open =                 pkt_open,
2453         .release =              pkt_close,
2454         .ioctl =                pkt_ioctl,
2455         .media_changed =        pkt_media_changed,
2456 };
2457
2458 /*
2459  * Set up mapping from pktcdvd device to CD-ROM device.
2460  */
2461 static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd)
2462 {
2463         int idx;
2464         int ret = -ENOMEM;
2465         struct pktcdvd_device *pd;
2466         struct gendisk *disk;
2467         dev_t dev = new_decode_dev(ctrl_cmd->dev);
2468
2469         for (idx = 0; idx < MAX_WRITERS; idx++)
2470                 if (!pkt_devs[idx])
2471                         break;
2472         if (idx == MAX_WRITERS) {
2473                 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS);
2474                 return -EBUSY;
2475         }
2476
2477         pd = kmalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2478         if (!pd)
2479                 return ret;
2480         memset(pd, 0, sizeof(struct pktcdvd_device));
2481
2482         pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL);
2483         if (!pd->rb_pool)
2484                 goto out_mem;
2485
2486         disk = alloc_disk(1);
2487         if (!disk)
2488                 goto out_mem;
2489         pd->disk = disk;
2490
2491         spin_lock_init(&pd->lock);
2492         spin_lock_init(&pd->iosched.lock);
2493         sprintf(pd->name, "pktcdvd%d", idx);
2494         init_waitqueue_head(&pd->wqueue);
2495         pd->bio_queue = RB_ROOT;
2496
2497         disk->major = pkt_major;
2498         disk->first_minor = idx;
2499         disk->fops = &pktcdvd_ops;
2500         disk->flags = GENHD_FL_REMOVABLE;
2501         sprintf(disk->disk_name, "pktcdvd%d", idx);
2502         disk->private_data = pd;
2503         disk->queue = blk_alloc_queue(GFP_KERNEL);
2504         if (!disk->queue)
2505                 goto out_mem2;
2506
2507         pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2508         ret = pkt_new_dev(pd, dev);
2509         if (ret)
2510                 goto out_new_dev;
2511
2512         add_disk(disk);
2513         pkt_devs[idx] = pd;
2514         ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2515         return 0;
2516
2517 out_new_dev:
2518         blk_put_queue(disk->queue);
2519 out_mem2:
2520         put_disk(disk);
2521 out_mem:
2522         if (pd->rb_pool)
2523                 mempool_destroy(pd->rb_pool);
2524         kfree(pd);
2525         return ret;
2526 }
2527
2528 /*
2529  * Tear down mapping from pktcdvd device to CD-ROM device.
2530  */
2531 static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd)
2532 {
2533         struct pktcdvd_device *pd;
2534         int idx;
2535         dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev);
2536
2537         for (idx = 0; idx < MAX_WRITERS; idx++) {
2538                 pd = pkt_devs[idx];
2539                 if (pd && (pd->pkt_dev == pkt_dev))
2540                         break;
2541         }
2542         if (idx == MAX_WRITERS) {
2543                 DPRINTK("pktcdvd: dev not setup\n");
2544                 return -ENXIO;
2545         }
2546
2547         if (pd->refcnt > 0)
2548                 return -EBUSY;
2549
2550         if (!IS_ERR(pd->cdrw.thread))
2551                 kthread_stop(pd->cdrw.thread);
2552
2553         blkdev_put(pd->bdev);
2554
2555         pkt_shrink_pktlist(pd);
2556
2557         remove_proc_entry(pd->name, pkt_proc);
2558         DPRINTK("pktcdvd: writer %s unmapped\n", pd->name);
2559
2560         del_gendisk(pd->disk);
2561         blk_put_queue(pd->disk->queue);
2562         put_disk(pd->disk);
2563
2564         pkt_devs[idx] = NULL;
2565         mempool_destroy(pd->rb_pool);
2566         kfree(pd);
2567
2568         /* This is safe: open() is still holding a reference. */
2569         module_put(THIS_MODULE);
2570         return 0;
2571 }
2572
2573 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2574 {
2575         struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2576         if (pd) {
2577                 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2578                 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2579         } else {
2580                 ctrl_cmd->dev = 0;
2581                 ctrl_cmd->pkt_dev = 0;
2582         }
2583         ctrl_cmd->num_devices = MAX_WRITERS;
2584 }
2585
2586 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2587 {
2588         void __user *argp = (void __user *)arg;
2589         struct pkt_ctrl_command ctrl_cmd;
2590         int ret = 0;
2591
2592         if (cmd != PACKET_CTRL_CMD)
2593                 return -ENOTTY;
2594
2595         if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2596                 return -EFAULT;
2597
2598         switch (ctrl_cmd.command) {
2599         case PKT_CTRL_CMD_SETUP:
2600                 if (!capable(CAP_SYS_ADMIN))
2601                         return -EPERM;
2602                 down(&ctl_mutex);
2603                 ret = pkt_setup_dev(&ctrl_cmd);
2604                 up(&ctl_mutex);
2605                 break;
2606         case PKT_CTRL_CMD_TEARDOWN:
2607                 if (!capable(CAP_SYS_ADMIN))
2608                         return -EPERM;
2609                 down(&ctl_mutex);
2610                 ret = pkt_remove_dev(&ctrl_cmd);
2611                 up(&ctl_mutex);
2612                 break;
2613         case PKT_CTRL_CMD_STATUS:
2614                 down(&ctl_mutex);
2615                 pkt_get_status(&ctrl_cmd);
2616                 up(&ctl_mutex);
2617                 break;
2618         default:
2619                 return -ENOTTY;
2620         }
2621
2622         if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2623                 return -EFAULT;
2624         return ret;
2625 }
2626
2627
2628 static struct file_operations pkt_ctl_fops = {
2629         .ioctl   = pkt_ctl_ioctl,
2630         .owner   = THIS_MODULE,
2631 };
2632
2633 static struct miscdevice pkt_misc = {
2634         .minor          = MISC_DYNAMIC_MINOR,
2635         .name           = "pktcdvd",
2636         .devfs_name     = "pktcdvd/control",
2637         .fops           = &pkt_ctl_fops
2638 };
2639
2640 static int __init pkt_init(void)
2641 {
2642         int ret;
2643
2644         psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL);
2645         if (!psd_pool)
2646                 return -ENOMEM;
2647
2648         ret = register_blkdev(pkt_major, "pktcdvd");
2649         if (ret < 0) {
2650                 printk("pktcdvd: Unable to register block device\n");
2651                 goto out2;
2652         }
2653         if (!pkt_major)
2654                 pkt_major = ret;
2655
2656         ret = misc_register(&pkt_misc);
2657         if (ret) {
2658                 printk("pktcdvd: Unable to register misc device\n");
2659                 goto out;
2660         }
2661
2662         init_MUTEX(&ctl_mutex);
2663
2664         pkt_proc = proc_mkdir("pktcdvd", proc_root_driver);
2665
2666         DPRINTK("pktcdvd: %s\n", VERSION_CODE);
2667         return 0;
2668
2669 out:
2670         unregister_blkdev(pkt_major, "pktcdvd");
2671 out2:
2672         mempool_destroy(psd_pool);
2673         return ret;
2674 }
2675
2676 static void __exit pkt_exit(void)
2677 {
2678         remove_proc_entry("pktcdvd", proc_root_driver);
2679         misc_deregister(&pkt_misc);
2680         unregister_blkdev(pkt_major, "pktcdvd");
2681         mempool_destroy(psd_pool);
2682 }
2683
2684 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2685 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2686 MODULE_LICENSE("GPL");
2687
2688 module_init(pkt_init);
2689 module_exit(pkt_exit);