2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
5 * May be copied or modified under the terms of the GNU General Public
6 * License. See linux/COPYING for more information.
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)
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
17 * - handle OPC, especially for -RW media
19 * Theory of operation:
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.
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.
32 *************************************************************************/
34 #define VERSION_CODE "v0.2.0a 2004-07-14 Jens Axboe (axboe@suse.de) and petero2@telia.com"
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>
52 #include <asm/uaccess.h>
55 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
57 #define DPRINTK(fmt, args...)
61 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
63 #define VPRINTK(fmt, args...)
66 #define MAX_SPEED 0xffff
68 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
70 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
71 static struct proc_dir_entry *pkt_proc;
73 static struct semaphore ctl_mutex; /* Serialize open/close/setup/teardown */
74 static mempool_t *psd_pool;
77 static void pkt_bio_finished(struct pktcdvd_device *pd)
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);
87 static void pkt_bio_destructor(struct bio *bio)
89 kfree(bio->bi_io_vec);
93 static struct bio *pkt_bio_alloc(int nr_iovecs)
95 struct bio_vec *bvl = NULL;
98 bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
103 bvl = kmalloc(nr_iovecs * sizeof(struct bio_vec), GFP_KERNEL);
106 memset(bvl, 0, nr_iovecs * sizeof(struct bio_vec));
108 bio->bi_max_vecs = nr_iovecs;
109 bio->bi_io_vec = bvl;
110 bio->bi_destructor = pkt_bio_destructor;
121 * Allocate a packet_data struct
123 static struct packet_data *pkt_alloc_packet_data(void)
126 struct packet_data *pkt;
128 pkt = kmalloc(sizeof(struct packet_data), GFP_KERNEL);
131 memset(pkt, 0, sizeof(struct packet_data));
133 pkt->w_bio = pkt_bio_alloc(PACKET_MAX_SIZE);
137 for (i = 0; i < PAGES_PER_PACKET; i++) {
138 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
143 spin_lock_init(&pkt->lock);
145 for (i = 0; i < PACKET_MAX_SIZE; i++) {
146 struct bio *bio = pkt_bio_alloc(1);
149 pkt->r_bios[i] = bio;
155 for (i = 0; i < PACKET_MAX_SIZE; i++) {
156 struct bio *bio = pkt->r_bios[i];
162 for (i = 0; i < PAGES_PER_PACKET; i++)
164 __free_page(pkt->pages[i]);
173 * Free a packet_data struct
175 static void pkt_free_packet_data(struct packet_data *pkt)
179 for (i = 0; i < PACKET_MAX_SIZE; i++) {
180 struct bio *bio = pkt->r_bios[i];
184 for (i = 0; i < PAGES_PER_PACKET; i++)
185 __free_page(pkt->pages[i]);
190 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
192 struct packet_data *pkt, *next;
194 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
196 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
197 pkt_free_packet_data(pkt);
201 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
203 struct packet_data *pkt;
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();
211 pkt_shrink_pktlist(pd);
214 pkt->id = nr_packets;
216 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
222 static void *pkt_rb_alloc(unsigned int __nocast gfp_mask, void *data)
224 return kmalloc(sizeof(struct pkt_rb_node), gfp_mask);
227 static void pkt_rb_free(void *ptr, void *data)
232 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
234 struct rb_node *n = rb_next(&node->rb_node);
237 return rb_entry(n, struct pkt_rb_node, rb_node);
240 static inline void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
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);
249 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
251 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
253 struct rb_node *n = pd->bio_queue.rb_node;
254 struct rb_node *next;
255 struct pkt_rb_node *tmp;
258 BUG_ON(pd->bio_queue_size > 0);
263 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
264 if (s <= tmp->bio->bi_sector)
273 if (s > tmp->bio->bi_sector) {
274 tmp = pkt_rbtree_next(tmp);
278 BUG_ON(s > tmp->bio->bi_sector);
283 * Insert a node into the pd->bio_queue rb tree.
285 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
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;
294 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
295 if (s < tmp->bio->bi_sector)
300 rb_link_node(&node->rb_node, parent, p);
301 rb_insert_color(&node->rb_node, &pd->bio_queue);
302 pd->bio_queue_size++;
306 * Add a bio to a single linked list defined by its head and tail pointers.
308 static inline void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
312 BUG_ON((*list_head) == NULL);
313 (*list_tail)->bi_next = bio;
316 BUG_ON((*list_head) != NULL);
323 * Remove and return the first bio from a single linked list defined by its
324 * head and tail pointers.
326 static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
330 if (*list_head == NULL)
334 *list_head = bio->bi_next;
335 if (*list_head == NULL)
343 * Send a packet_command to the underlying block device and
344 * wait for completion.
346 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
348 char sense[SCSI_SENSE_BUFFERSIZE];
351 DECLARE_COMPLETION(wait);
354 q = bdev_get_queue(pd->bdev);
356 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ,
359 rq->rq_disk = pd->bdev->bd_disk;
363 rq->data = cgc->buffer;
364 rq->data_len = cgc->buflen;
366 memset(sense, 0, sizeof(sense));
368 rq->flags |= REQ_BLOCK_PC | REQ_HARDBARRIER;
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);
376 rq->flags |= REQ_NOMERGE;
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);
391 * A generic sense dump / resolve mechanism should be implemented across
392 * all ATAPI + SCSI devices.
394 static void pkt_dump_sense(struct packet_command *cgc)
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" };
400 struct request_sense *sense = cgc->sense;
403 for (i = 0; i < CDROM_PACKET_SIZE; i++)
404 printk(" %02x", cgc->cmd[i]);
408 printk("no sense\n");
412 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
414 if (sense->sense_key > 8) {
415 printk(" (INVALID)\n");
419 printk(" (%s)\n", info[sense->sense_key]);
423 * flush the drive cache to media
425 static int pkt_flush_cache(struct pktcdvd_device *pd)
427 struct packet_command cgc;
429 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
430 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
434 * the IMMED bit -- we default to not setting it, although that
435 * would allow a much faster close, this is safer
440 return pkt_generic_packet(pd, &cgc);
444 * speed is given as the normal factor, e.g. 4 for 4x
446 static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed)
448 struct packet_command cgc;
449 struct request_sense sense;
452 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
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;
460 if ((ret = pkt_generic_packet(pd, &cgc)))
461 pkt_dump_sense(&cgc);
467 * Queue a bio for processing by the low-level CD device. Must be called
468 * from process context.
470 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
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);
477 pkt_add_list_last(bio, &pd->iosched.write_queue,
478 &pd->iosched.write_queue_tail);
480 spin_unlock(&pd->iosched.lock);
482 atomic_set(&pd->iosched.attention, 1);
483 wake_up(&pd->wqueue);
487 * Process the queued read/write requests. This function handles special
488 * requirements for CDRW drives:
489 * - A cache flush command must be inserted before a read request if the
490 * previous request was a write.
491 * - Switching between reading and writing is slow, so don't do it more often
493 * - Optimize for throughput at the expense of latency. This means that streaming
494 * writes will never be interrupted by a read, but if the drive has to seek
495 * before the next write, switch to reading instead if there are any pending
497 * - Set the read speed according to current usage pattern. When only reading
498 * from the device, it's best to use the highest possible read speed, but
499 * when switching often between reading and writing, it's better to have the
500 * same read and write speeds.
502 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
506 if (atomic_read(&pd->iosched.attention) == 0)
508 atomic_set(&pd->iosched.attention, 0);
510 q = bdev_get_queue(pd->bdev);
514 int reads_queued, writes_queued;
516 spin_lock(&pd->iosched.lock);
517 reads_queued = (pd->iosched.read_queue != NULL);
518 writes_queued = (pd->iosched.write_queue != NULL);
519 spin_unlock(&pd->iosched.lock);
521 if (!reads_queued && !writes_queued)
524 if (pd->iosched.writing) {
525 int need_write_seek = 1;
526 spin_lock(&pd->iosched.lock);
527 bio = pd->iosched.write_queue;
528 spin_unlock(&pd->iosched.lock);
529 if (bio && (bio->bi_sector == pd->iosched.last_write))
531 if (need_write_seek && reads_queued) {
532 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
533 VPRINTK("pktcdvd: write, waiting\n");
537 pd->iosched.writing = 0;
540 if (!reads_queued && writes_queued) {
541 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
542 VPRINTK("pktcdvd: read, waiting\n");
545 pd->iosched.writing = 1;
549 spin_lock(&pd->iosched.lock);
550 if (pd->iosched.writing) {
551 bio = pkt_get_list_first(&pd->iosched.write_queue,
552 &pd->iosched.write_queue_tail);
554 bio = pkt_get_list_first(&pd->iosched.read_queue,
555 &pd->iosched.read_queue_tail);
557 spin_unlock(&pd->iosched.lock);
562 if (bio_data_dir(bio) == READ)
563 pd->iosched.successive_reads += bio->bi_size >> 10;
565 pd->iosched.successive_reads = 0;
566 pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
568 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
569 if (pd->read_speed == pd->write_speed) {
570 pd->read_speed = MAX_SPEED;
571 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
574 if (pd->read_speed != pd->write_speed) {
575 pd->read_speed = pd->write_speed;
576 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
580 atomic_inc(&pd->cdrw.pending_bios);
581 generic_make_request(bio);
586 * Special care is needed if the underlying block device has a small
587 * max_phys_segments value.
589 static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q)
591 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
593 * The cdrom device can handle one segment/frame
595 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
597 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
599 * We can handle this case at the expense of some extra memory
600 * copies during write operations
602 set_bit(PACKET_MERGE_SEGS, &pd->flags);
605 printk("pktcdvd: cdrom max_phys_segments too small\n");
611 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
613 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
615 unsigned int copy_size = CD_FRAMESIZE;
617 while (copy_size > 0) {
618 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
619 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
620 src_bvl->bv_offset + offs;
621 void *vto = page_address(dst_page) + dst_offs;
622 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
625 memcpy(vto, vfrom, len);
626 kunmap_atomic(vfrom, KM_USER0);
636 * Copy all data for this packet to pkt->pages[], so that
637 * a) The number of required segments for the write bio is minimized, which
638 * is necessary for some scsi controllers.
639 * b) The data can be used as cache to avoid read requests if we receive a
640 * new write request for the same zone.
642 static void pkt_make_local_copy(struct packet_data *pkt, struct page **pages, int *offsets)
646 /* Copy all data to pkt->pages[] */
649 for (f = 0; f < pkt->frames; f++) {
650 if (pages[f] != pkt->pages[p]) {
651 void *vfrom = kmap_atomic(pages[f], KM_USER0) + offsets[f];
652 void *vto = page_address(pkt->pages[p]) + offs;
653 memcpy(vto, vfrom, CD_FRAMESIZE);
654 kunmap_atomic(vfrom, KM_USER0);
655 pages[f] = pkt->pages[p];
658 BUG_ON(offsets[f] != offs);
660 offs += CD_FRAMESIZE;
661 if (offs >= PAGE_SIZE) {
662 BUG_ON(offs > PAGE_SIZE);
669 static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
671 struct packet_data *pkt = bio->bi_private;
672 struct pktcdvd_device *pd = pkt->pd;
678 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
679 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
682 atomic_inc(&pkt->io_errors);
683 if (atomic_dec_and_test(&pkt->io_wait)) {
684 atomic_inc(&pkt->run_sm);
685 wake_up(&pd->wqueue);
687 pkt_bio_finished(pd);
692 static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err)
694 struct packet_data *pkt = bio->bi_private;
695 struct pktcdvd_device *pd = pkt->pd;
701 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
703 pd->stats.pkt_ended++;
705 pkt_bio_finished(pd);
706 atomic_dec(&pkt->io_wait);
707 atomic_inc(&pkt->run_sm);
708 wake_up(&pd->wqueue);
713 * Schedule reads for the holes in a packet
715 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
720 char written[PACKET_MAX_SIZE];
722 BUG_ON(!pkt->orig_bios);
724 atomic_set(&pkt->io_wait, 0);
725 atomic_set(&pkt->io_errors, 0);
727 if (pkt->cache_valid) {
728 VPRINTK("pkt_gather_data: zone %llx cached\n",
729 (unsigned long long)pkt->sector);
734 * Figure out which frames we need to read before we can write.
736 memset(written, 0, sizeof(written));
737 spin_lock(&pkt->lock);
738 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
739 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
740 int num_frames = bio->bi_size / CD_FRAMESIZE;
741 BUG_ON(first_frame < 0);
742 BUG_ON(first_frame + num_frames > pkt->frames);
743 for (f = first_frame; f < first_frame + num_frames; f++)
746 spin_unlock(&pkt->lock);
749 * Schedule reads for missing parts of the packet.
751 for (f = 0; f < pkt->frames; f++) {
755 bio = pkt->r_bios[f];
757 bio->bi_max_vecs = 1;
758 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
759 bio->bi_bdev = pd->bdev;
760 bio->bi_end_io = pkt_end_io_read;
761 bio->bi_private = pkt;
763 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
764 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
765 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
766 f, pkt->pages[p], offset);
767 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
770 atomic_inc(&pkt->io_wait);
772 pkt_queue_bio(pd, bio);
777 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
778 frames_read, (unsigned long long)pkt->sector);
779 pd->stats.pkt_started++;
780 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
781 pd->stats.secs_w += pd->settings.size;
785 * Find a packet matching zone, or the least recently used packet if
788 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
790 struct packet_data *pkt;
792 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
793 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
794 list_del_init(&pkt->list);
795 if (pkt->sector != zone)
796 pkt->cache_valid = 0;
803 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
805 if (pkt->cache_valid) {
806 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
808 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
813 * recover a failed write, query for relocation if possible
815 * returns 1 if recovery is possible, or 0 if not
818 static int pkt_start_recovery(struct packet_data *pkt)
821 * FIXME. We need help from the file system to implement
826 struct request *rq = pkt->rq;
827 struct pktcdvd_device *pd = rq->rq_disk->private_data;
828 struct block_device *pkt_bdev;
829 struct super_block *sb = NULL;
830 unsigned long old_block, new_block;
833 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
835 sb = get_super(pkt_bdev);
842 if (!sb->s_op || !sb->s_op->relocate_blocks)
845 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
846 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
849 new_sector = new_block * (CD_FRAMESIZE >> 9);
850 pkt->sector = new_sector;
852 pkt->bio->bi_sector = new_sector;
853 pkt->bio->bi_next = NULL;
854 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
855 pkt->bio->bi_idx = 0;
857 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
858 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
859 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
860 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
861 BUG_ON(pkt->bio->bi_private != pkt);
872 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
875 static const char *state_name[] = {
876 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
878 enum packet_data_state old_state = pkt->state;
879 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
880 state_name[old_state], state_name[state]);
886 * Scan the work queue to see if we can start a new packet.
887 * returns non-zero if any work was done.
889 static int pkt_handle_queue(struct pktcdvd_device *pd)
891 struct packet_data *pkt, *p;
892 struct bio *bio = NULL;
893 sector_t zone = 0; /* Suppress gcc warning */
894 struct pkt_rb_node *node, *first_node;
897 VPRINTK("handle_queue\n");
899 atomic_set(&pd->scan_queue, 0);
901 if (list_empty(&pd->cdrw.pkt_free_list)) {
902 VPRINTK("handle_queue: no pkt\n");
907 * Try to find a zone we are not already working on.
909 spin_lock(&pd->lock);
910 first_node = pkt_rbtree_find(pd, pd->current_sector);
912 n = rb_first(&pd->bio_queue);
914 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
919 zone = ZONE(bio->bi_sector, pd);
920 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
921 if (p->sector == zone) {
928 node = pkt_rbtree_next(node);
930 n = rb_first(&pd->bio_queue);
932 node = rb_entry(n, struct pkt_rb_node, rb_node);
934 if (node == first_node)
937 spin_unlock(&pd->lock);
939 VPRINTK("handle_queue: no bio\n");
943 pkt = pkt_get_packet_data(pd, zone);
946 pd->current_sector = zone + pd->settings.size;
948 pkt->frames = pd->settings.size >> 2;
952 * Scan work queue for bios in the same zone and link them
955 spin_lock(&pd->lock);
956 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
957 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
959 VPRINTK("pkt_handle_queue: found zone=%llx\n",
960 (unsigned long long)ZONE(bio->bi_sector, pd));
961 if (ZONE(bio->bi_sector, pd) != zone)
963 pkt_rbtree_erase(pd, node);
964 spin_lock(&pkt->lock);
965 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
966 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
967 spin_unlock(&pkt->lock);
969 spin_unlock(&pd->lock);
971 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
972 pkt_set_state(pkt, PACKET_WAITING_STATE);
973 atomic_set(&pkt->run_sm, 1);
975 spin_lock(&pd->cdrw.active_list_lock);
976 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
977 spin_unlock(&pd->cdrw.active_list_lock);
983 * Assemble a bio to write one packet and queue the bio for processing
984 * by the underlying block device.
986 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
989 struct page *pages[PACKET_MAX_SIZE];
990 int offsets[PACKET_MAX_SIZE];
994 for (f = 0; f < pkt->frames; f++) {
995 pages[f] = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
996 offsets[f] = (f * CD_FRAMESIZE) % PAGE_SIZE;
1000 * Fill-in pages[] and offsets[] with data from orig_bios.
1003 spin_lock(&pkt->lock);
1004 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1005 int segment = bio->bi_idx;
1007 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1008 int num_frames = bio->bi_size / CD_FRAMESIZE;
1009 BUG_ON(first_frame < 0);
1010 BUG_ON(first_frame + num_frames > pkt->frames);
1011 for (f = first_frame; f < first_frame + num_frames; f++) {
1012 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1014 while (src_offs >= src_bvl->bv_len) {
1015 src_offs -= src_bvl->bv_len;
1017 BUG_ON(segment >= bio->bi_vcnt);
1018 src_bvl = bio_iovec_idx(bio, segment);
1021 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1022 pages[f] = src_bvl->bv_page;
1023 offsets[f] = src_bvl->bv_offset + src_offs;
1025 pkt_copy_bio_data(bio, segment, src_offs,
1026 pages[f], offsets[f]);
1028 src_offs += CD_FRAMESIZE;
1032 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1033 spin_unlock(&pkt->lock);
1035 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1036 frames_write, (unsigned long long)pkt->sector);
1037 BUG_ON(frames_write != pkt->write_size);
1039 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1040 pkt_make_local_copy(pkt, pages, offsets);
1041 pkt->cache_valid = 1;
1043 pkt->cache_valid = 0;
1046 /* Start the write request */
1047 bio_init(pkt->w_bio);
1048 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1049 pkt->w_bio->bi_sector = pkt->sector;
1050 pkt->w_bio->bi_bdev = pd->bdev;
1051 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1052 pkt->w_bio->bi_private = pkt;
1053 for (f = 0; f < pkt->frames; f++) {
1054 if ((f + 1 < pkt->frames) && (pages[f + 1] == pages[f]) &&
1055 (offsets[f + 1] = offsets[f] + CD_FRAMESIZE)) {
1056 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE * 2, offsets[f]))
1060 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE, offsets[f]))
1064 VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt);
1066 atomic_set(&pkt->io_wait, 1);
1067 pkt->w_bio->bi_rw = WRITE;
1068 pkt_queue_bio(pd, pkt->w_bio);
1071 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1073 struct bio *bio, *next;
1076 pkt->cache_valid = 0;
1078 /* Finish all bios corresponding to this packet */
1079 bio = pkt->orig_bios;
1081 next = bio->bi_next;
1082 bio->bi_next = NULL;
1083 bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
1086 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1089 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1093 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1096 switch (pkt->state) {
1097 case PACKET_WAITING_STATE:
1098 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1101 pkt->sleep_time = 0;
1102 pkt_gather_data(pd, pkt);
1103 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1106 case PACKET_READ_WAIT_STATE:
1107 if (atomic_read(&pkt->io_wait) > 0)
1110 if (atomic_read(&pkt->io_errors) > 0) {
1111 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1113 pkt_start_write(pd, pkt);
1117 case PACKET_WRITE_WAIT_STATE:
1118 if (atomic_read(&pkt->io_wait) > 0)
1121 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1122 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1124 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1128 case PACKET_RECOVERY_STATE:
1129 if (pkt_start_recovery(pkt)) {
1130 pkt_start_write(pd, pkt);
1132 VPRINTK("No recovery possible\n");
1133 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1137 case PACKET_FINISHED_STATE:
1138 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1139 pkt_finish_packet(pkt, uptodate);
1149 static void pkt_handle_packets(struct pktcdvd_device *pd)
1151 struct packet_data *pkt, *next;
1153 VPRINTK("pkt_handle_packets\n");
1156 * Run state machine for active packets
1158 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1159 if (atomic_read(&pkt->run_sm) > 0) {
1160 atomic_set(&pkt->run_sm, 0);
1161 pkt_run_state_machine(pd, pkt);
1166 * Move no longer active packets to the free list
1168 spin_lock(&pd->cdrw.active_list_lock);
1169 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1170 if (pkt->state == PACKET_FINISHED_STATE) {
1171 list_del(&pkt->list);
1172 pkt_put_packet_data(pd, pkt);
1173 pkt_set_state(pkt, PACKET_IDLE_STATE);
1174 atomic_set(&pd->scan_queue, 1);
1177 spin_unlock(&pd->cdrw.active_list_lock);
1180 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1182 struct packet_data *pkt;
1185 for (i = 0; i <= PACKET_NUM_STATES; i++)
1188 spin_lock(&pd->cdrw.active_list_lock);
1189 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1190 states[pkt->state]++;
1192 spin_unlock(&pd->cdrw.active_list_lock);
1196 * kcdrwd is woken up when writes have been queued for one of our
1197 * registered devices
1199 static int kcdrwd(void *foobar)
1201 struct pktcdvd_device *pd = foobar;
1202 struct packet_data *pkt;
1203 long min_sleep_time, residue;
1205 set_user_nice(current, -20);
1208 DECLARE_WAITQUEUE(wait, current);
1211 * Wait until there is something to do
1213 add_wait_queue(&pd->wqueue, &wait);
1215 set_current_state(TASK_INTERRUPTIBLE);
1217 /* Check if we need to run pkt_handle_queue */
1218 if (atomic_read(&pd->scan_queue) > 0)
1221 /* Check if we need to run the state machine for some packet */
1222 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1223 if (atomic_read(&pkt->run_sm) > 0)
1227 /* Check if we need to process the iosched queues */
1228 if (atomic_read(&pd->iosched.attention) != 0)
1231 /* Otherwise, go to sleep */
1232 if (PACKET_DEBUG > 1) {
1233 int states[PACKET_NUM_STATES];
1234 pkt_count_states(pd, states);
1235 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1236 states[0], states[1], states[2], states[3],
1237 states[4], states[5]);
1240 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1241 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1242 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1243 min_sleep_time = pkt->sleep_time;
1246 generic_unplug_device(bdev_get_queue(pd->bdev));
1248 VPRINTK("kcdrwd: sleeping\n");
1249 residue = schedule_timeout(min_sleep_time);
1250 VPRINTK("kcdrwd: wake up\n");
1252 /* make swsusp happy with our thread */
1255 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1256 if (!pkt->sleep_time)
1258 pkt->sleep_time -= min_sleep_time - residue;
1259 if (pkt->sleep_time <= 0) {
1260 pkt->sleep_time = 0;
1261 atomic_inc(&pkt->run_sm);
1265 if (signal_pending(current)) {
1266 flush_signals(current);
1268 if (kthread_should_stop())
1272 set_current_state(TASK_RUNNING);
1273 remove_wait_queue(&pd->wqueue, &wait);
1275 if (kthread_should_stop())
1279 * if pkt_handle_queue returns true, we can queue
1282 while (pkt_handle_queue(pd))
1286 * Handle packet state machine
1288 pkt_handle_packets(pd);
1291 * Handle iosched queues
1293 pkt_iosched_process_queue(pd);
1299 static void pkt_print_settings(struct pktcdvd_device *pd)
1301 printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1302 printk("%u blocks, ", pd->settings.size >> 2);
1303 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1306 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1308 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1310 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1311 cgc->cmd[2] = page_code | (page_control << 6);
1312 cgc->cmd[7] = cgc->buflen >> 8;
1313 cgc->cmd[8] = cgc->buflen & 0xff;
1314 cgc->data_direction = CGC_DATA_READ;
1315 return pkt_generic_packet(pd, cgc);
1318 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1320 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1321 memset(cgc->buffer, 0, 2);
1322 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1323 cgc->cmd[1] = 0x10; /* PF */
1324 cgc->cmd[7] = cgc->buflen >> 8;
1325 cgc->cmd[8] = cgc->buflen & 0xff;
1326 cgc->data_direction = CGC_DATA_WRITE;
1327 return pkt_generic_packet(pd, cgc);
1330 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1332 struct packet_command cgc;
1335 /* set up command and get the disc info */
1336 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1337 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1338 cgc.cmd[8] = cgc.buflen = 2;
1341 if ((ret = pkt_generic_packet(pd, &cgc)))
1344 /* not all drives have the same disc_info length, so requeue
1345 * packet with the length the drive tells us it can supply
1347 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1348 sizeof(di->disc_information_length);
1350 if (cgc.buflen > sizeof(disc_information))
1351 cgc.buflen = sizeof(disc_information);
1353 cgc.cmd[8] = cgc.buflen;
1354 return pkt_generic_packet(pd, &cgc);
1357 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1359 struct packet_command cgc;
1362 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1363 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1364 cgc.cmd[1] = type & 3;
1365 cgc.cmd[4] = (track & 0xff00) >> 8;
1366 cgc.cmd[5] = track & 0xff;
1370 if ((ret = pkt_generic_packet(pd, &cgc)))
1373 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1374 sizeof(ti->track_information_length);
1376 if (cgc.buflen > sizeof(track_information))
1377 cgc.buflen = sizeof(track_information);
1379 cgc.cmd[8] = cgc.buflen;
1380 return pkt_generic_packet(pd, &cgc);
1383 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1385 disc_information di;
1386 track_information ti;
1390 if ((ret = pkt_get_disc_info(pd, &di)))
1393 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1394 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1397 /* if this track is blank, try the previous. */
1400 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1404 /* if last recorded field is valid, return it. */
1406 *last_written = be32_to_cpu(ti.last_rec_address);
1408 /* make it up instead */
1409 *last_written = be32_to_cpu(ti.track_start) +
1410 be32_to_cpu(ti.track_size);
1412 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1418 * write mode select package based on pd->settings
1420 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1422 struct packet_command cgc;
1423 struct request_sense sense;
1424 write_param_page *wp;
1428 /* doesn't apply to DVD+RW or DVD-RAM */
1429 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1432 memset(buffer, 0, sizeof(buffer));
1433 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1435 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1436 pkt_dump_sense(&cgc);
1440 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1441 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1442 if (size > sizeof(buffer))
1443 size = sizeof(buffer);
1448 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1450 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1451 pkt_dump_sense(&cgc);
1456 * write page is offset header + block descriptor length
1458 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1460 wp->fp = pd->settings.fp;
1461 wp->track_mode = pd->settings.track_mode;
1462 wp->write_type = pd->settings.write_type;
1463 wp->data_block_type = pd->settings.block_mode;
1465 wp->multi_session = 0;
1467 #ifdef PACKET_USE_LS
1472 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1473 wp->session_format = 0;
1475 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1476 wp->session_format = 0x20;
1480 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1486 printk("pktcdvd: write mode wrong %d\n", wp->data_block_type);
1489 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1491 cgc.buflen = cgc.cmd[8] = size;
1492 if ((ret = pkt_mode_select(pd, &cgc))) {
1493 pkt_dump_sense(&cgc);
1497 pkt_print_settings(pd);
1502 * 0 -- we can write to this track, 1 -- we can't
1504 static int pkt_good_track(track_information *ti)
1507 * only good for CD-RW at the moment, not DVD-RW
1511 * FIXME: only for FP
1517 * "good" settings as per Mt Fuji.
1519 if (ti->rt == 0 && ti->blank == 0 && ti->packet == 1)
1522 if (ti->rt == 0 && ti->blank == 1 && ti->packet == 1)
1525 if (ti->rt == 1 && ti->blank == 0 && ti->packet == 1)
1528 printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1533 * 0 -- we can write to this disc, 1 -- we can't
1535 static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di)
1537 switch (pd->mmc3_profile) {
1538 case 0x0a: /* CD-RW */
1539 case 0xffff: /* MMC3 not supported */
1541 case 0x1a: /* DVD+RW */
1542 case 0x13: /* DVD-RW */
1543 case 0x12: /* DVD-RAM */
1546 printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
1551 * for disc type 0xff we should probably reserve a new track.
1552 * but i'm not sure, should we leave this to user apps? probably.
1554 if (di->disc_type == 0xff) {
1555 printk("pktcdvd: Unknown disc. No track?\n");
1559 if (di->disc_type != 0x20 && di->disc_type != 0) {
1560 printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type);
1564 if (di->erasable == 0) {
1565 printk("pktcdvd: Disc not erasable\n");
1569 if (di->border_status == PACKET_SESSION_RESERVED) {
1570 printk("pktcdvd: Can't write to last track (reserved)\n");
1577 static int pkt_probe_settings(struct pktcdvd_device *pd)
1579 struct packet_command cgc;
1580 unsigned char buf[12];
1581 disc_information di;
1582 track_information ti;
1585 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1586 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1588 ret = pkt_generic_packet(pd, &cgc);
1589 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1591 memset(&di, 0, sizeof(disc_information));
1592 memset(&ti, 0, sizeof(track_information));
1594 if ((ret = pkt_get_disc_info(pd, &di))) {
1595 printk("failed get_disc\n");
1599 if (pkt_good_disc(pd, &di))
1602 switch (pd->mmc3_profile) {
1603 case 0x1a: /* DVD+RW */
1604 printk("pktcdvd: inserted media is DVD+RW\n");
1606 case 0x13: /* DVD-RW */
1607 printk("pktcdvd: inserted media is DVD-RW\n");
1609 case 0x12: /* DVD-RAM */
1610 printk("pktcdvd: inserted media is DVD-RAM\n");
1613 printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : "");
1616 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1618 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1619 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1620 printk("pktcdvd: failed get_track\n");
1624 if (pkt_good_track(&ti)) {
1625 printk("pktcdvd: can't write to this track\n");
1630 * we keep packet size in 512 byte units, makes it easier to
1631 * deal with request calculations.
1633 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1634 if (pd->settings.size == 0) {
1635 printk("pktcdvd: detected zero packet size!\n");
1636 pd->settings.size = 128;
1638 if (pd->settings.size > PACKET_MAX_SECTORS) {
1639 printk("pktcdvd: packet size is too big\n");
1642 pd->settings.fp = ti.fp;
1643 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1646 pd->nwa = be32_to_cpu(ti.next_writable);
1647 set_bit(PACKET_NWA_VALID, &pd->flags);
1651 * in theory we could use lra on -RW media as well and just zero
1652 * blocks that haven't been written yet, but in practice that
1653 * is just a no-go. we'll use that for -R, naturally.
1656 pd->lra = be32_to_cpu(ti.last_rec_address);
1657 set_bit(PACKET_LRA_VALID, &pd->flags);
1659 pd->lra = 0xffffffff;
1660 set_bit(PACKET_LRA_VALID, &pd->flags);
1666 pd->settings.link_loss = 7;
1667 pd->settings.write_type = 0; /* packet */
1668 pd->settings.track_mode = ti.track_mode;
1671 * mode1 or mode2 disc
1673 switch (ti.data_mode) {
1675 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1678 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1681 printk("pktcdvd: unknown data mode\n");
1688 * enable/disable write caching on drive
1690 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
1692 struct packet_command cgc;
1693 struct request_sense sense;
1694 unsigned char buf[64];
1697 memset(buf, 0, sizeof(buf));
1698 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1700 cgc.buflen = pd->mode_offset + 12;
1703 * caching mode page might not be there, so quiet this command
1707 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1710 buf[pd->mode_offset + 10] |= (!!set << 2);
1712 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1713 ret = pkt_mode_select(pd, &cgc);
1715 printk("pktcdvd: write caching control failed\n");
1716 pkt_dump_sense(&cgc);
1717 } else if (!ret && set)
1718 printk("pktcdvd: enabled write caching on %s\n", pd->name);
1722 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1724 struct packet_command cgc;
1726 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1727 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1728 cgc.cmd[4] = lockflag ? 1 : 0;
1729 return pkt_generic_packet(pd, &cgc);
1733 * Returns drive maximum write speed
1735 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
1737 struct packet_command cgc;
1738 struct request_sense sense;
1739 unsigned char buf[256+18];
1740 unsigned char *cap_buf;
1743 memset(buf, 0, sizeof(buf));
1744 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1745 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1748 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1750 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1751 sizeof(struct mode_page_header);
1752 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1754 pkt_dump_sense(&cgc);
1759 offset = 20; /* Obsoleted field, used by older drives */
1760 if (cap_buf[1] >= 28)
1761 offset = 28; /* Current write speed selected */
1762 if (cap_buf[1] >= 30) {
1763 /* If the drive reports at least one "Logical Unit Write
1764 * Speed Performance Descriptor Block", use the information
1765 * in the first block. (contains the highest speed)
1767 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1772 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1776 /* These tables from cdrecord - I don't have orange book */
1777 /* standard speed CD-RW (1-4x) */
1778 static char clv_to_speed[16] = {
1779 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1780 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1782 /* high speed CD-RW (-10x) */
1783 static char hs_clv_to_speed[16] = {
1784 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1785 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1787 /* ultra high speed CD-RW */
1788 static char us_clv_to_speed[16] = {
1789 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1790 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
1794 * reads the maximum media speed from ATIP
1796 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
1798 struct packet_command cgc;
1799 struct request_sense sense;
1800 unsigned char buf[64];
1801 unsigned int size, st, sp;
1804 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
1806 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1808 cgc.cmd[2] = 4; /* READ ATIP */
1810 ret = pkt_generic_packet(pd, &cgc);
1812 pkt_dump_sense(&cgc);
1815 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
1816 if (size > sizeof(buf))
1819 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1821 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1825 ret = pkt_generic_packet(pd, &cgc);
1827 pkt_dump_sense(&cgc);
1831 if (!buf[6] & 0x40) {
1832 printk("pktcdvd: Disc type is not CD-RW\n");
1835 if (!buf[6] & 0x4) {
1836 printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n");
1840 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
1842 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
1844 /* Info from cdrecord */
1846 case 0: /* standard speed */
1847 *speed = clv_to_speed[sp];
1849 case 1: /* high speed */
1850 *speed = hs_clv_to_speed[sp];
1852 case 2: /* ultra high speed */
1853 *speed = us_clv_to_speed[sp];
1856 printk("pktcdvd: Unknown disc sub-type %d\n",st);
1860 printk("pktcdvd: Max. media speed: %d\n",*speed);
1863 printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st);
1868 static int pkt_perform_opc(struct pktcdvd_device *pd)
1870 struct packet_command cgc;
1871 struct request_sense sense;
1874 VPRINTK("pktcdvd: Performing OPC\n");
1876 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1878 cgc.timeout = 60*HZ;
1879 cgc.cmd[0] = GPCMD_SEND_OPC;
1881 if ((ret = pkt_generic_packet(pd, &cgc)))
1882 pkt_dump_sense(&cgc);
1886 static int pkt_open_write(struct pktcdvd_device *pd)
1889 unsigned int write_speed, media_write_speed, read_speed;
1891 if ((ret = pkt_probe_settings(pd))) {
1892 DPRINTK("pktcdvd: %s failed probe\n", pd->name);
1896 if ((ret = pkt_set_write_settings(pd))) {
1897 DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name);
1901 pkt_write_caching(pd, USE_WCACHING);
1903 if ((ret = pkt_get_max_speed(pd, &write_speed)))
1904 write_speed = 16 * 177;
1905 switch (pd->mmc3_profile) {
1906 case 0x13: /* DVD-RW */
1907 case 0x1a: /* DVD+RW */
1908 case 0x12: /* DVD-RAM */
1909 DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
1912 if ((ret = pkt_media_speed(pd, &media_write_speed)))
1913 media_write_speed = 16;
1914 write_speed = min(write_speed, media_write_speed * 177);
1915 DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176);
1918 read_speed = write_speed;
1920 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
1921 DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
1924 pd->write_speed = write_speed;
1925 pd->read_speed = read_speed;
1927 if ((ret = pkt_perform_opc(pd))) {
1928 DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name);
1935 * called at open time.
1937 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
1944 * We need to re-open the cdrom device without O_NONBLOCK to be able
1945 * to read/write from/to it. It is already opened in O_NONBLOCK mode
1946 * so bdget() can't fail.
1948 bdget(pd->bdev->bd_dev);
1949 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
1952 if ((ret = pkt_get_last_written(pd, &lba))) {
1953 printk("pktcdvd: pkt_get_last_written failed\n");
1957 set_capacity(pd->disk, lba << 2);
1958 set_capacity(pd->bdev->bd_disk, lba << 2);
1959 bd_set_size(pd->bdev, (loff_t)lba << 11);
1961 q = bdev_get_queue(pd->bdev);
1963 if ((ret = pkt_open_write(pd)))
1966 * Some CDRW drives can not handle writes larger than one packet,
1967 * even if the size is a multiple of the packet size.
1969 spin_lock_irq(q->queue_lock);
1970 blk_queue_max_sectors(q, pd->settings.size);
1971 spin_unlock_irq(q->queue_lock);
1972 set_bit(PACKET_WRITABLE, &pd->flags);
1974 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1975 clear_bit(PACKET_WRITABLE, &pd->flags);
1978 if ((ret = pkt_set_segment_merging(pd, q)))
1982 printk("pktcdvd: %lukB available on disc\n", lba << 1);
1987 blkdev_put(pd->bdev);
1993 * called when the device is closed. makes sure that the device flushes
1994 * the internal cache before we close.
1996 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
1998 if (flush && pkt_flush_cache(pd))
1999 DPRINTK("pktcdvd: %s not flushing cache\n", pd->name);
2001 pkt_lock_door(pd, 0);
2003 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2004 blkdev_put(pd->bdev);
2007 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2009 if (dev_minor >= MAX_WRITERS)
2011 return pkt_devs[dev_minor];
2014 static int pkt_open(struct inode *inode, struct file *file)
2016 struct pktcdvd_device *pd = NULL;
2019 VPRINTK("pktcdvd: entering open\n");
2022 pd = pkt_find_dev_from_minor(iminor(inode));
2027 BUG_ON(pd->refcnt < 0);
2030 if (pd->refcnt > 1) {
2031 if ((file->f_mode & FMODE_WRITE) &&
2032 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2037 if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) {
2042 * needed here as well, since ext2 (among others) may change
2043 * the blocksize at mount time
2045 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2054 VPRINTK("pktcdvd: failed open (%d)\n", ret);
2059 static int pkt_close(struct inode *inode, struct file *file)
2061 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2066 BUG_ON(pd->refcnt < 0);
2067 if (pd->refcnt == 0) {
2068 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2069 pkt_release_dev(pd, flush);
2076 static void *psd_pool_alloc(unsigned int __nocast gfp_mask, void *data)
2078 return kmalloc(sizeof(struct packet_stacked_data), gfp_mask);
2081 static void psd_pool_free(void *ptr, void *data)
2086 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2088 struct packet_stacked_data *psd = bio->bi_private;
2089 struct pktcdvd_device *pd = psd->pd;
2095 bio_endio(psd->bio, psd->bio->bi_size, err);
2096 mempool_free(psd, psd_pool);
2097 pkt_bio_finished(pd);
2101 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2103 struct pktcdvd_device *pd;
2104 char b[BDEVNAME_SIZE];
2106 struct packet_data *pkt;
2107 int was_empty, blocked_bio;
2108 struct pkt_rb_node *node;
2112 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2117 * Clone READ bios so we can have our own bi_end_io callback.
2119 if (bio_data_dir(bio) == READ) {
2120 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2121 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2125 cloned_bio->bi_bdev = pd->bdev;
2126 cloned_bio->bi_private = psd;
2127 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2128 pd->stats.secs_r += bio->bi_size >> 9;
2129 pkt_queue_bio(pd, cloned_bio);
2133 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2134 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2135 pd->name, (unsigned long long)bio->bi_sector);
2139 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2140 printk("pktcdvd: wrong bio size\n");
2144 blk_queue_bounce(q, &bio);
2146 zone = ZONE(bio->bi_sector, pd);
2147 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2148 (unsigned long long)bio->bi_sector,
2149 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2151 /* Check if we have to split the bio */
2153 struct bio_pair *bp;
2157 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2158 if (last_zone != zone) {
2159 BUG_ON(last_zone != zone + pd->settings.size);
2160 first_sectors = last_zone - bio->bi_sector;
2161 bp = bio_split(bio, bio_split_pool, first_sectors);
2163 pkt_make_request(q, &bp->bio1);
2164 pkt_make_request(q, &bp->bio2);
2165 bio_pair_release(bp);
2171 * If we find a matching packet in state WAITING or READ_WAIT, we can
2172 * just append this bio to that packet.
2174 spin_lock(&pd->cdrw.active_list_lock);
2176 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2177 if (pkt->sector == zone) {
2178 spin_lock(&pkt->lock);
2179 if ((pkt->state == PACKET_WAITING_STATE) ||
2180 (pkt->state == PACKET_READ_WAIT_STATE)) {
2181 pkt_add_list_last(bio, &pkt->orig_bios,
2182 &pkt->orig_bios_tail);
2183 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2184 if ((pkt->write_size >= pkt->frames) &&
2185 (pkt->state == PACKET_WAITING_STATE)) {
2186 atomic_inc(&pkt->run_sm);
2187 wake_up(&pd->wqueue);
2189 spin_unlock(&pkt->lock);
2190 spin_unlock(&pd->cdrw.active_list_lock);
2195 spin_unlock(&pkt->lock);
2198 spin_unlock(&pd->cdrw.active_list_lock);
2201 * No matching packet found. Store the bio in the work queue.
2203 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2206 spin_lock(&pd->lock);
2207 BUG_ON(pd->bio_queue_size < 0);
2208 was_empty = (pd->bio_queue_size == 0);
2209 pkt_rbtree_insert(pd, node);
2210 spin_unlock(&pd->lock);
2213 * Wake up the worker thread.
2215 atomic_set(&pd->scan_queue, 1);
2217 /* This wake_up is required for correct operation */
2218 wake_up(&pd->wqueue);
2219 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2221 * This wake up is not required for correct operation,
2222 * but improves performance in some cases.
2224 wake_up(&pd->wqueue);
2228 bio_io_error(bio, bio->bi_size);
2234 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2236 struct pktcdvd_device *pd = q->queuedata;
2237 sector_t zone = ZONE(bio->bi_sector, pd);
2238 int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2239 int remaining = (pd->settings.size << 9) - used;
2243 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2244 * boundary, pkt_make_request() will split the bio.
2246 remaining2 = PAGE_SIZE - bio->bi_size;
2247 remaining = max(remaining, remaining2);
2249 BUG_ON(remaining < 0);
2253 static void pkt_init_queue(struct pktcdvd_device *pd)
2255 request_queue_t *q = pd->disk->queue;
2257 blk_queue_make_request(q, pkt_make_request);
2258 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2259 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2260 blk_queue_merge_bvec(q, pkt_merge_bvec);
2264 static int pkt_seq_show(struct seq_file *m, void *p)
2266 struct pktcdvd_device *pd = m->private;
2268 char bdev_buf[BDEVNAME_SIZE];
2269 int states[PACKET_NUM_STATES];
2271 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2272 bdevname(pd->bdev, bdev_buf));
2274 seq_printf(m, "\nSettings:\n");
2275 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2277 if (pd->settings.write_type == 0)
2281 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2283 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2284 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2286 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2288 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2290 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2294 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2296 seq_printf(m, "\nStatistics:\n");
2297 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2298 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2299 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2300 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2301 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2303 seq_printf(m, "\nMisc:\n");
2304 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2305 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2306 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2307 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2308 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2309 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2311 seq_printf(m, "\nQueue state:\n");
2312 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2313 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2314 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2316 pkt_count_states(pd, states);
2317 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2318 states[0], states[1], states[2], states[3], states[4], states[5]);
2323 static int pkt_seq_open(struct inode *inode, struct file *file)
2325 return single_open(file, pkt_seq_show, PDE(inode)->data);
2328 static struct file_operations pkt_proc_fops = {
2329 .open = pkt_seq_open,
2331 .llseek = seq_lseek,
2332 .release = single_release
2335 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2339 char b[BDEVNAME_SIZE];
2340 struct proc_dir_entry *proc;
2341 struct block_device *bdev;
2343 if (pd->pkt_dev == dev) {
2344 printk("pktcdvd: Recursive setup not allowed\n");
2347 for (i = 0; i < MAX_WRITERS; i++) {
2348 struct pktcdvd_device *pd2 = pkt_devs[i];
2351 if (pd2->bdev->bd_dev == dev) {
2352 printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b));
2355 if (pd2->pkt_dev == dev) {
2356 printk("pktcdvd: Can't chain pktcdvd devices\n");
2364 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2368 /* This is safe, since we have a reference from open(). */
2369 __module_get(THIS_MODULE);
2371 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2372 printk("pktcdvd: not enough memory for buffers\n");
2378 set_blocksize(bdev, CD_FRAMESIZE);
2382 atomic_set(&pd->cdrw.pending_bios, 0);
2383 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2384 if (IS_ERR(pd->cdrw.thread)) {
2385 printk("pktcdvd: can't start kernel thread\n");
2390 proc = create_proc_entry(pd->name, 0, pkt_proc);
2393 proc->proc_fops = &pkt_proc_fops;
2395 DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2399 pkt_shrink_pktlist(pd);
2402 /* This is safe: open() is still holding a reference. */
2403 module_put(THIS_MODULE);
2407 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2409 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2411 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2416 * forward selected CDROM ioctls to CD-ROM, for UDF
2418 case CDROMMULTISESSION:
2419 case CDROMREADTOCENTRY:
2420 case CDROM_LAST_WRITTEN:
2421 case CDROM_SEND_PACKET:
2422 case SCSI_IOCTL_SEND_COMMAND:
2423 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2427 * The door gets locked when the device is opened, so we
2428 * have to unlock it or else the eject command fails.
2430 pkt_lock_door(pd, 0);
2431 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2434 printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);
2441 static int pkt_media_changed(struct gendisk *disk)
2443 struct pktcdvd_device *pd = disk->private_data;
2444 struct gendisk *attached_disk;
2450 attached_disk = pd->bdev->bd_disk;
2453 return attached_disk->fops->media_changed(attached_disk);
2456 static struct block_device_operations pktcdvd_ops = {
2457 .owner = THIS_MODULE,
2459 .release = pkt_close,
2461 .media_changed = pkt_media_changed,
2465 * Set up mapping from pktcdvd device to CD-ROM device.
2467 static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd)
2471 struct pktcdvd_device *pd;
2472 struct gendisk *disk;
2473 dev_t dev = new_decode_dev(ctrl_cmd->dev);
2475 for (idx = 0; idx < MAX_WRITERS; idx++)
2478 if (idx == MAX_WRITERS) {
2479 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS);
2483 pd = kmalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2486 memset(pd, 0, sizeof(struct pktcdvd_device));
2488 pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL);
2492 disk = alloc_disk(1);
2497 spin_lock_init(&pd->lock);
2498 spin_lock_init(&pd->iosched.lock);
2499 sprintf(pd->name, "pktcdvd%d", idx);
2500 init_waitqueue_head(&pd->wqueue);
2501 pd->bio_queue = RB_ROOT;
2503 disk->major = pkt_major;
2504 disk->first_minor = idx;
2505 disk->fops = &pktcdvd_ops;
2506 disk->flags = GENHD_FL_REMOVABLE;
2507 sprintf(disk->disk_name, "pktcdvd%d", idx);
2508 disk->private_data = pd;
2509 disk->queue = blk_alloc_queue(GFP_KERNEL);
2513 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2514 ret = pkt_new_dev(pd, dev);
2520 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2524 blk_put_queue(disk->queue);
2529 mempool_destroy(pd->rb_pool);
2535 * Tear down mapping from pktcdvd device to CD-ROM device.
2537 static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd)
2539 struct pktcdvd_device *pd;
2541 dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev);
2543 for (idx = 0; idx < MAX_WRITERS; idx++) {
2545 if (pd && (pd->pkt_dev == pkt_dev))
2548 if (idx == MAX_WRITERS) {
2549 DPRINTK("pktcdvd: dev not setup\n");
2556 if (!IS_ERR(pd->cdrw.thread))
2557 kthread_stop(pd->cdrw.thread);
2559 blkdev_put(pd->bdev);
2561 pkt_shrink_pktlist(pd);
2563 remove_proc_entry(pd->name, pkt_proc);
2564 DPRINTK("pktcdvd: writer %s unmapped\n", pd->name);
2566 del_gendisk(pd->disk);
2567 blk_put_queue(pd->disk->queue);
2570 pkt_devs[idx] = NULL;
2571 mempool_destroy(pd->rb_pool);
2574 /* This is safe: open() is still holding a reference. */
2575 module_put(THIS_MODULE);
2579 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2581 struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2583 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2584 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2587 ctrl_cmd->pkt_dev = 0;
2589 ctrl_cmd->num_devices = MAX_WRITERS;
2592 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2594 void __user *argp = (void __user *)arg;
2595 struct pkt_ctrl_command ctrl_cmd;
2598 if (cmd != PACKET_CTRL_CMD)
2601 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2604 switch (ctrl_cmd.command) {
2605 case PKT_CTRL_CMD_SETUP:
2606 if (!capable(CAP_SYS_ADMIN))
2609 ret = pkt_setup_dev(&ctrl_cmd);
2612 case PKT_CTRL_CMD_TEARDOWN:
2613 if (!capable(CAP_SYS_ADMIN))
2616 ret = pkt_remove_dev(&ctrl_cmd);
2619 case PKT_CTRL_CMD_STATUS:
2621 pkt_get_status(&ctrl_cmd);
2628 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2634 static struct file_operations pkt_ctl_fops = {
2635 .ioctl = pkt_ctl_ioctl,
2636 .owner = THIS_MODULE,
2639 static struct miscdevice pkt_misc = {
2640 .minor = MISC_DYNAMIC_MINOR,
2642 .devfs_name = "pktcdvd/control",
2643 .fops = &pkt_ctl_fops
2646 static int __init pkt_init(void)
2650 psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL);
2654 ret = register_blkdev(pkt_major, "pktcdvd");
2656 printk("pktcdvd: Unable to register block device\n");
2662 ret = misc_register(&pkt_misc);
2664 printk("pktcdvd: Unable to register misc device\n");
2668 init_MUTEX(&ctl_mutex);
2670 pkt_proc = proc_mkdir("pktcdvd", proc_root_driver);
2672 DPRINTK("pktcdvd: %s\n", VERSION_CODE);
2676 unregister_blkdev(pkt_major, "pktcdvd");
2678 mempool_destroy(psd_pool);
2682 static void __exit pkt_exit(void)
2684 remove_proc_entry("pktcdvd", proc_root_driver);
2685 misc_deregister(&pkt_misc);
2686 unregister_blkdev(pkt_major, "pktcdvd");
2687 mempool_destroy(psd_pool);
2690 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2691 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2692 MODULE_LICENSE("GPL");
2694 module_init(pkt_init);
2695 module_exit(pkt_exit);