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(int 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 elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);
379 generic_unplug_device(q);
380 wait_for_completion(&wait);
390 * A generic sense dump / resolve mechanism should be implemented across
391 * all ATAPI + SCSI devices.
393 static void pkt_dump_sense(struct packet_command *cgc)
395 static char *info[9] = { "No sense", "Recovered error", "Not ready",
396 "Medium error", "Hardware error", "Illegal request",
397 "Unit attention", "Data protect", "Blank check" };
399 struct request_sense *sense = cgc->sense;
402 for (i = 0; i < CDROM_PACKET_SIZE; i++)
403 printk(" %02x", cgc->cmd[i]);
407 printk("no sense\n");
411 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
413 if (sense->sense_key > 8) {
414 printk(" (INVALID)\n");
418 printk(" (%s)\n", info[sense->sense_key]);
422 * flush the drive cache to media
424 static int pkt_flush_cache(struct pktcdvd_device *pd)
426 struct packet_command cgc;
428 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
429 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
433 * the IMMED bit -- we default to not setting it, although that
434 * would allow a much faster close, this is safer
439 return pkt_generic_packet(pd, &cgc);
443 * speed is given as the normal factor, e.g. 4 for 4x
445 static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed)
447 struct packet_command cgc;
448 struct request_sense sense;
451 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
453 cgc.cmd[0] = GPCMD_SET_SPEED;
454 cgc.cmd[2] = (read_speed >> 8) & 0xff;
455 cgc.cmd[3] = read_speed & 0xff;
456 cgc.cmd[4] = (write_speed >> 8) & 0xff;
457 cgc.cmd[5] = write_speed & 0xff;
459 if ((ret = pkt_generic_packet(pd, &cgc)))
460 pkt_dump_sense(&cgc);
466 * Queue a bio for processing by the low-level CD device. Must be called
467 * from process context.
469 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio, int high_prio_read)
471 spin_lock(&pd->iosched.lock);
472 if (bio_data_dir(bio) == READ) {
473 pkt_add_list_last(bio, &pd->iosched.read_queue,
474 &pd->iosched.read_queue_tail);
476 pd->iosched.high_prio_read = 1;
478 pkt_add_list_last(bio, &pd->iosched.write_queue,
479 &pd->iosched.write_queue_tail);
481 spin_unlock(&pd->iosched.lock);
483 atomic_set(&pd->iosched.attention, 1);
484 wake_up(&pd->wqueue);
488 * Process the queued read/write requests. This function handles special
489 * requirements for CDRW drives:
490 * - A cache flush command must be inserted before a read request if the
491 * previous request was a write.
492 * - Switching between reading and writing is slow, so don't it more often
494 * - Set the read speed according to current usage pattern. When only reading
495 * from the device, it's best to use the highest possible read speed, but
496 * when switching often between reading and writing, it's better to have the
497 * same read and write speeds.
498 * - Reads originating from user space should have higher priority than reads
499 * originating from pkt_gather_data, because some process is usually waiting
500 * on reads of the first kind.
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, high_prio_read;
516 spin_lock(&pd->iosched.lock);
517 reads_queued = (pd->iosched.read_queue != NULL);
518 writes_queued = (pd->iosched.write_queue != NULL);
520 pd->iosched.high_prio_read = 0;
521 high_prio_read = pd->iosched.high_prio_read;
522 spin_unlock(&pd->iosched.lock);
524 if (!reads_queued && !writes_queued)
527 if (pd->iosched.writing) {
528 if (high_prio_read || (!writes_queued && reads_queued)) {
529 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
530 VPRINTK("pktcdvd: write, waiting\n");
534 pd->iosched.writing = 0;
537 if (!reads_queued && writes_queued) {
538 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
539 VPRINTK("pktcdvd: read, waiting\n");
542 pd->iosched.writing = 1;
546 spin_lock(&pd->iosched.lock);
547 if (pd->iosched.writing) {
548 bio = pkt_get_list_first(&pd->iosched.write_queue,
549 &pd->iosched.write_queue_tail);
551 bio = pkt_get_list_first(&pd->iosched.read_queue,
552 &pd->iosched.read_queue_tail);
554 spin_unlock(&pd->iosched.lock);
559 if (bio_data_dir(bio) == READ)
560 pd->iosched.successive_reads += bio->bi_size >> 10;
562 pd->iosched.successive_reads = 0;
563 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
564 if (pd->read_speed == pd->write_speed) {
565 pd->read_speed = MAX_SPEED;
566 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
569 if (pd->read_speed != pd->write_speed) {
570 pd->read_speed = pd->write_speed;
571 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
575 atomic_inc(&pd->cdrw.pending_bios);
576 generic_make_request(bio);
581 * Special care is needed if the underlying block device has a small
582 * max_phys_segments value.
584 static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q)
586 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
588 * The cdrom device can handle one segment/frame
590 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
592 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
594 * We can handle this case at the expense of some extra memory
595 * copies during write operations
597 set_bit(PACKET_MERGE_SEGS, &pd->flags);
600 printk("pktcdvd: cdrom max_phys_segments too small\n");
606 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
608 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
610 unsigned int copy_size = CD_FRAMESIZE;
612 while (copy_size > 0) {
613 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
614 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
615 src_bvl->bv_offset + offs;
616 void *vto = page_address(dst_page) + dst_offs;
617 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
620 memcpy(vto, vfrom, len);
621 kunmap_atomic(vfrom, KM_USER0);
631 * Copy all data for this packet to pkt->pages[], so that
632 * a) The number of required segments for the write bio is minimized, which
633 * is necessary for some scsi controllers.
634 * b) The data can be used as cache to avoid read requests if we receive a
635 * new write request for the same zone.
637 static void pkt_make_local_copy(struct packet_data *pkt, struct page **pages, int *offsets)
641 /* Copy all data to pkt->pages[] */
644 for (f = 0; f < pkt->frames; f++) {
645 if (pages[f] != pkt->pages[p]) {
646 void *vfrom = kmap_atomic(pages[f], KM_USER0) + offsets[f];
647 void *vto = page_address(pkt->pages[p]) + offs;
648 memcpy(vto, vfrom, CD_FRAMESIZE);
649 kunmap_atomic(vfrom, KM_USER0);
650 pages[f] = pkt->pages[p];
653 BUG_ON(offsets[f] != offs);
655 offs += CD_FRAMESIZE;
656 if (offs >= PAGE_SIZE) {
657 BUG_ON(offs > PAGE_SIZE);
664 static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
666 struct packet_data *pkt = bio->bi_private;
667 struct pktcdvd_device *pd = pkt->pd;
673 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
674 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
677 atomic_inc(&pkt->io_errors);
678 if (atomic_dec_and_test(&pkt->io_wait)) {
679 atomic_inc(&pkt->run_sm);
680 wake_up(&pd->wqueue);
682 pkt_bio_finished(pd);
687 static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err)
689 struct packet_data *pkt = bio->bi_private;
690 struct pktcdvd_device *pd = pkt->pd;
696 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
698 pd->stats.pkt_ended++;
700 pkt_bio_finished(pd);
701 atomic_dec(&pkt->io_wait);
702 atomic_inc(&pkt->run_sm);
703 wake_up(&pd->wqueue);
708 * Schedule reads for the holes in a packet
710 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
715 char written[PACKET_MAX_SIZE];
717 BUG_ON(!pkt->orig_bios);
719 atomic_set(&pkt->io_wait, 0);
720 atomic_set(&pkt->io_errors, 0);
722 if (pkt->cache_valid) {
723 VPRINTK("pkt_gather_data: zone %llx cached\n",
724 (unsigned long long)pkt->sector);
729 * Figure out which frames we need to read before we can write.
731 memset(written, 0, sizeof(written));
732 spin_lock(&pkt->lock);
733 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
734 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
735 int num_frames = bio->bi_size / CD_FRAMESIZE;
736 BUG_ON(first_frame < 0);
737 BUG_ON(first_frame + num_frames > pkt->frames);
738 for (f = first_frame; f < first_frame + num_frames; f++)
741 spin_unlock(&pkt->lock);
744 * Schedule reads for missing parts of the packet.
746 for (f = 0; f < pkt->frames; f++) {
750 bio = pkt->r_bios[f];
752 bio->bi_max_vecs = 1;
753 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
754 bio->bi_bdev = pd->bdev;
755 bio->bi_end_io = pkt_end_io_read;
756 bio->bi_private = pkt;
758 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
759 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
760 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
761 f, pkt->pages[p], offset);
762 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
765 atomic_inc(&pkt->io_wait);
767 pkt_queue_bio(pd, bio, 0);
772 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
773 frames_read, (unsigned long long)pkt->sector);
774 pd->stats.pkt_started++;
775 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
776 pd->stats.secs_w += pd->settings.size;
780 * Find a packet matching zone, or the least recently used packet if
783 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
785 struct packet_data *pkt;
787 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
788 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
789 list_del_init(&pkt->list);
790 if (pkt->sector != zone)
791 pkt->cache_valid = 0;
798 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
800 if (pkt->cache_valid) {
801 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
803 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
808 * recover a failed write, query for relocation if possible
810 * returns 1 if recovery is possible, or 0 if not
813 static int pkt_start_recovery(struct packet_data *pkt)
816 * FIXME. We need help from the file system to implement
821 struct request *rq = pkt->rq;
822 struct pktcdvd_device *pd = rq->rq_disk->private_data;
823 struct block_device *pkt_bdev;
824 struct super_block *sb = NULL;
825 unsigned long old_block, new_block;
828 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
830 sb = get_super(pkt_bdev);
837 if (!sb->s_op || !sb->s_op->relocate_blocks)
840 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
841 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
844 new_sector = new_block * (CD_FRAMESIZE >> 9);
845 pkt->sector = new_sector;
847 pkt->bio->bi_sector = new_sector;
848 pkt->bio->bi_next = NULL;
849 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
850 pkt->bio->bi_idx = 0;
852 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
853 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
854 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
855 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
856 BUG_ON(pkt->bio->bi_private != pkt);
867 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
870 static const char *state_name[] = {
871 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
873 enum packet_data_state old_state = pkt->state;
874 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
875 state_name[old_state], state_name[state]);
881 * Scan the work queue to see if we can start a new packet.
882 * returns non-zero if any work was done.
884 static int pkt_handle_queue(struct pktcdvd_device *pd)
886 struct packet_data *pkt, *p;
887 struct bio *bio = NULL;
888 sector_t zone = 0; /* Suppress gcc warning */
889 struct pkt_rb_node *node, *first_node;
892 VPRINTK("handle_queue\n");
894 atomic_set(&pd->scan_queue, 0);
896 if (list_empty(&pd->cdrw.pkt_free_list)) {
897 VPRINTK("handle_queue: no pkt\n");
902 * Try to find a zone we are not already working on.
904 spin_lock(&pd->lock);
905 first_node = pkt_rbtree_find(pd, pd->current_sector);
907 n = rb_first(&pd->bio_queue);
909 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
914 zone = ZONE(bio->bi_sector, pd);
915 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
916 if (p->sector == zone)
921 node = pkt_rbtree_next(node);
923 n = rb_first(&pd->bio_queue);
925 node = rb_entry(n, struct pkt_rb_node, rb_node);
927 if (node == first_node)
930 spin_unlock(&pd->lock);
932 VPRINTK("handle_queue: no bio\n");
936 pkt = pkt_get_packet_data(pd, zone);
939 pd->current_sector = zone + pd->settings.size;
941 pkt->frames = pd->settings.size >> 2;
942 BUG_ON(pkt->frames > PACKET_MAX_SIZE);
946 * Scan work queue for bios in the same zone and link them
949 spin_lock(&pd->lock);
950 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
951 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
953 VPRINTK("pkt_handle_queue: found zone=%llx\n",
954 (unsigned long long)ZONE(bio->bi_sector, pd));
955 if (ZONE(bio->bi_sector, pd) != zone)
957 pkt_rbtree_erase(pd, node);
958 spin_lock(&pkt->lock);
959 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
960 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
961 spin_unlock(&pkt->lock);
963 spin_unlock(&pd->lock);
965 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
966 pkt_set_state(pkt, PACKET_WAITING_STATE);
967 atomic_set(&pkt->run_sm, 1);
969 spin_lock(&pd->cdrw.active_list_lock);
970 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
971 spin_unlock(&pd->cdrw.active_list_lock);
977 * Assemble a bio to write one packet and queue the bio for processing
978 * by the underlying block device.
980 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
983 struct page *pages[PACKET_MAX_SIZE];
984 int offsets[PACKET_MAX_SIZE];
988 for (f = 0; f < pkt->frames; f++) {
989 pages[f] = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
990 offsets[f] = (f * CD_FRAMESIZE) % PAGE_SIZE;
994 * Fill-in pages[] and offsets[] with data from orig_bios.
997 spin_lock(&pkt->lock);
998 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
999 int segment = bio->bi_idx;
1001 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1002 int num_frames = bio->bi_size / CD_FRAMESIZE;
1003 BUG_ON(first_frame < 0);
1004 BUG_ON(first_frame + num_frames > pkt->frames);
1005 for (f = first_frame; f < first_frame + num_frames; f++) {
1006 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1008 while (src_offs >= src_bvl->bv_len) {
1009 src_offs -= src_bvl->bv_len;
1011 BUG_ON(segment >= bio->bi_vcnt);
1012 src_bvl = bio_iovec_idx(bio, segment);
1015 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1016 pages[f] = src_bvl->bv_page;
1017 offsets[f] = src_bvl->bv_offset + src_offs;
1019 pkt_copy_bio_data(bio, segment, src_offs,
1020 pages[f], offsets[f]);
1022 src_offs += CD_FRAMESIZE;
1026 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1027 spin_unlock(&pkt->lock);
1029 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1030 frames_write, (unsigned long long)pkt->sector);
1031 BUG_ON(frames_write != pkt->write_size);
1033 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1034 pkt_make_local_copy(pkt, pages, offsets);
1035 pkt->cache_valid = 1;
1037 pkt->cache_valid = 0;
1040 /* Start the write request */
1041 bio_init(pkt->w_bio);
1042 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1043 pkt->w_bio->bi_sector = pkt->sector;
1044 pkt->w_bio->bi_bdev = pd->bdev;
1045 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1046 pkt->w_bio->bi_private = pkt;
1047 for (f = 0; f < pkt->frames; f++) {
1048 if ((f + 1 < pkt->frames) && (pages[f + 1] == pages[f]) &&
1049 (offsets[f + 1] = offsets[f] + CD_FRAMESIZE)) {
1050 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE * 2, offsets[f]))
1054 if (!bio_add_page(pkt->w_bio, pages[f], CD_FRAMESIZE, offsets[f]))
1058 VPRINTK("pktcdvd: vcnt=%d\n", pkt->w_bio->bi_vcnt);
1060 atomic_set(&pkt->io_wait, 1);
1061 pkt->w_bio->bi_rw = WRITE;
1062 pkt_queue_bio(pd, pkt->w_bio, 0);
1065 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1067 struct bio *bio, *next;
1070 pkt->cache_valid = 0;
1072 /* Finish all bios corresponding to this packet */
1073 bio = pkt->orig_bios;
1075 next = bio->bi_next;
1076 bio->bi_next = NULL;
1077 bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
1080 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1083 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1087 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1090 switch (pkt->state) {
1091 case PACKET_WAITING_STATE:
1092 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1095 pkt->sleep_time = 0;
1096 pkt_gather_data(pd, pkt);
1097 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1100 case PACKET_READ_WAIT_STATE:
1101 if (atomic_read(&pkt->io_wait) > 0)
1104 if (atomic_read(&pkt->io_errors) > 0) {
1105 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1107 pkt_start_write(pd, pkt);
1111 case PACKET_WRITE_WAIT_STATE:
1112 if (atomic_read(&pkt->io_wait) > 0)
1115 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1116 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1118 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1122 case PACKET_RECOVERY_STATE:
1123 if (pkt_start_recovery(pkt)) {
1124 pkt_start_write(pd, pkt);
1126 VPRINTK("No recovery possible\n");
1127 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1131 case PACKET_FINISHED_STATE:
1132 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1133 pkt_finish_packet(pkt, uptodate);
1143 static void pkt_handle_packets(struct pktcdvd_device *pd)
1145 struct packet_data *pkt, *next;
1147 VPRINTK("pkt_handle_packets\n");
1150 * Run state machine for active packets
1152 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1153 if (atomic_read(&pkt->run_sm) > 0) {
1154 atomic_set(&pkt->run_sm, 0);
1155 pkt_run_state_machine(pd, pkt);
1160 * Move no longer active packets to the free list
1162 spin_lock(&pd->cdrw.active_list_lock);
1163 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1164 if (pkt->state == PACKET_FINISHED_STATE) {
1165 list_del(&pkt->list);
1166 pkt_put_packet_data(pd, pkt);
1167 pkt_set_state(pkt, PACKET_IDLE_STATE);
1168 atomic_set(&pd->scan_queue, 1);
1171 spin_unlock(&pd->cdrw.active_list_lock);
1174 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1176 struct packet_data *pkt;
1179 for (i = 0; i <= PACKET_NUM_STATES; i++)
1182 spin_lock(&pd->cdrw.active_list_lock);
1183 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1184 states[pkt->state]++;
1186 spin_unlock(&pd->cdrw.active_list_lock);
1190 * kcdrwd is woken up when writes have been queued for one of our
1191 * registered devices
1193 static int kcdrwd(void *foobar)
1195 struct pktcdvd_device *pd = foobar;
1196 struct packet_data *pkt;
1197 long min_sleep_time, residue;
1199 set_user_nice(current, -20);
1202 DECLARE_WAITQUEUE(wait, current);
1205 * Wait until there is something to do
1207 add_wait_queue(&pd->wqueue, &wait);
1209 set_current_state(TASK_INTERRUPTIBLE);
1211 /* Check if we need to run pkt_handle_queue */
1212 if (atomic_read(&pd->scan_queue) > 0)
1215 /* Check if we need to run the state machine for some packet */
1216 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1217 if (atomic_read(&pkt->run_sm) > 0)
1221 /* Check if we need to process the iosched queues */
1222 if (atomic_read(&pd->iosched.attention) != 0)
1225 /* Otherwise, go to sleep */
1226 if (PACKET_DEBUG > 1) {
1227 int states[PACKET_NUM_STATES];
1228 pkt_count_states(pd, states);
1229 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1230 states[0], states[1], states[2], states[3],
1231 states[4], states[5]);
1234 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1235 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1236 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1237 min_sleep_time = pkt->sleep_time;
1240 generic_unplug_device(bdev_get_queue(pd->bdev));
1242 VPRINTK("kcdrwd: sleeping\n");
1243 residue = schedule_timeout(min_sleep_time);
1244 VPRINTK("kcdrwd: wake up\n");
1246 /* make swsusp happy with our thread */
1247 if (current->flags & PF_FREEZE)
1248 refrigerator(PF_FREEZE);
1250 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1251 if (!pkt->sleep_time)
1253 pkt->sleep_time -= min_sleep_time - residue;
1254 if (pkt->sleep_time <= 0) {
1255 pkt->sleep_time = 0;
1256 atomic_inc(&pkt->run_sm);
1260 if (signal_pending(current)) {
1261 flush_signals(current);
1263 if (kthread_should_stop())
1267 set_current_state(TASK_RUNNING);
1268 remove_wait_queue(&pd->wqueue, &wait);
1270 if (kthread_should_stop())
1274 * if pkt_handle_queue returns true, we can queue
1277 while (pkt_handle_queue(pd))
1281 * Handle packet state machine
1283 pkt_handle_packets(pd);
1286 * Handle iosched queues
1288 pkt_iosched_process_queue(pd);
1294 static void pkt_print_settings(struct pktcdvd_device *pd)
1296 printk("pktcdvd: %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1297 printk("%u blocks, ", pd->settings.size >> 2);
1298 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1301 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1303 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1305 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1306 cgc->cmd[2] = page_code | (page_control << 6);
1307 cgc->cmd[7] = cgc->buflen >> 8;
1308 cgc->cmd[8] = cgc->buflen & 0xff;
1309 cgc->data_direction = CGC_DATA_READ;
1310 return pkt_generic_packet(pd, cgc);
1313 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1315 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1316 memset(cgc->buffer, 0, 2);
1317 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1318 cgc->cmd[1] = 0x10; /* PF */
1319 cgc->cmd[7] = cgc->buflen >> 8;
1320 cgc->cmd[8] = cgc->buflen & 0xff;
1321 cgc->data_direction = CGC_DATA_WRITE;
1322 return pkt_generic_packet(pd, cgc);
1325 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1327 struct packet_command cgc;
1330 /* set up command and get the disc info */
1331 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1332 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1333 cgc.cmd[8] = cgc.buflen = 2;
1336 if ((ret = pkt_generic_packet(pd, &cgc)))
1339 /* not all drives have the same disc_info length, so requeue
1340 * packet with the length the drive tells us it can supply
1342 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1343 sizeof(di->disc_information_length);
1345 if (cgc.buflen > sizeof(disc_information))
1346 cgc.buflen = sizeof(disc_information);
1348 cgc.cmd[8] = cgc.buflen;
1349 return pkt_generic_packet(pd, &cgc);
1352 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1354 struct packet_command cgc;
1357 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1358 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1359 cgc.cmd[1] = type & 3;
1360 cgc.cmd[4] = (track & 0xff00) >> 8;
1361 cgc.cmd[5] = track & 0xff;
1365 if ((ret = pkt_generic_packet(pd, &cgc)))
1368 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1369 sizeof(ti->track_information_length);
1371 if (cgc.buflen > sizeof(track_information))
1372 cgc.buflen = sizeof(track_information);
1374 cgc.cmd[8] = cgc.buflen;
1375 return pkt_generic_packet(pd, &cgc);
1378 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1380 disc_information di;
1381 track_information ti;
1385 if ((ret = pkt_get_disc_info(pd, &di)))
1388 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1389 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1392 /* if this track is blank, try the previous. */
1395 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1399 /* if last recorded field is valid, return it. */
1401 *last_written = be32_to_cpu(ti.last_rec_address);
1403 /* make it up instead */
1404 *last_written = be32_to_cpu(ti.track_start) +
1405 be32_to_cpu(ti.track_size);
1407 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1413 * write mode select package based on pd->settings
1415 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1417 struct packet_command cgc;
1418 struct request_sense sense;
1419 write_param_page *wp;
1423 /* doesn't apply to DVD+RW */
1424 if (pd->mmc3_profile == 0x1a)
1427 memset(buffer, 0, sizeof(buffer));
1428 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1430 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1431 pkt_dump_sense(&cgc);
1435 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1436 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1437 if (size > sizeof(buffer))
1438 size = sizeof(buffer);
1443 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1445 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1446 pkt_dump_sense(&cgc);
1451 * write page is offset header + block descriptor length
1453 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1455 wp->fp = pd->settings.fp;
1456 wp->track_mode = pd->settings.track_mode;
1457 wp->write_type = pd->settings.write_type;
1458 wp->data_block_type = pd->settings.block_mode;
1460 wp->multi_session = 0;
1462 #ifdef PACKET_USE_LS
1467 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1468 wp->session_format = 0;
1470 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1471 wp->session_format = 0x20;
1475 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1481 printk("pktcdvd: write mode wrong %d\n", wp->data_block_type);
1484 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1486 cgc.buflen = cgc.cmd[8] = size;
1487 if ((ret = pkt_mode_select(pd, &cgc))) {
1488 pkt_dump_sense(&cgc);
1492 pkt_print_settings(pd);
1497 * 0 -- we can write to this track, 1 -- we can't
1499 static int pkt_good_track(track_information *ti)
1502 * only good for CD-RW at the moment, not DVD-RW
1506 * FIXME: only for FP
1512 * "good" settings as per Mt Fuji.
1514 if (ti->rt == 0 && ti->blank == 0 && ti->packet == 1)
1517 if (ti->rt == 0 && ti->blank == 1 && ti->packet == 1)
1520 if (ti->rt == 1 && ti->blank == 0 && ti->packet == 1)
1523 printk("pktcdvd: bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1528 * 0 -- we can write to this disc, 1 -- we can't
1530 static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di)
1532 switch (pd->mmc3_profile) {
1533 case 0x0a: /* CD-RW */
1534 case 0xffff: /* MMC3 not supported */
1536 case 0x1a: /* DVD+RW */
1537 case 0x13: /* DVD-RW */
1540 printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
1545 * for disc type 0xff we should probably reserve a new track.
1546 * but i'm not sure, should we leave this to user apps? probably.
1548 if (di->disc_type == 0xff) {
1549 printk("pktcdvd: Unknown disc. No track?\n");
1553 if (di->disc_type != 0x20 && di->disc_type != 0) {
1554 printk("pktcdvd: Wrong disc type (%x)\n", di->disc_type);
1558 if (di->erasable == 0) {
1559 printk("pktcdvd: Disc not erasable\n");
1563 if (di->border_status == PACKET_SESSION_RESERVED) {
1564 printk("pktcdvd: Can't write to last track (reserved)\n");
1571 static int pkt_probe_settings(struct pktcdvd_device *pd)
1573 struct packet_command cgc;
1574 unsigned char buf[12];
1575 disc_information di;
1576 track_information ti;
1579 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1580 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1582 ret = pkt_generic_packet(pd, &cgc);
1583 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1585 memset(&di, 0, sizeof(disc_information));
1586 memset(&ti, 0, sizeof(track_information));
1588 if ((ret = pkt_get_disc_info(pd, &di))) {
1589 printk("failed get_disc\n");
1593 if (pkt_good_disc(pd, &di))
1596 switch (pd->mmc3_profile) {
1597 case 0x1a: /* DVD+RW */
1598 printk("pktcdvd: inserted media is DVD+RW\n");
1600 case 0x13: /* DVD-RW */
1601 printk("pktcdvd: inserted media is DVD-RW\n");
1604 printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : "");
1607 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1609 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1610 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1611 printk("pktcdvd: failed get_track\n");
1615 if (pkt_good_track(&ti)) {
1616 printk("pktcdvd: can't write to this track\n");
1621 * we keep packet size in 512 byte units, makes it easier to
1622 * deal with request calculations.
1624 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1625 if (pd->settings.size == 0) {
1626 printk("pktcdvd: detected zero packet size!\n");
1627 pd->settings.size = 128;
1629 pd->settings.fp = ti.fp;
1630 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1633 pd->nwa = be32_to_cpu(ti.next_writable);
1634 set_bit(PACKET_NWA_VALID, &pd->flags);
1638 * in theory we could use lra on -RW media as well and just zero
1639 * blocks that haven't been written yet, but in practice that
1640 * is just a no-go. we'll use that for -R, naturally.
1643 pd->lra = be32_to_cpu(ti.last_rec_address);
1644 set_bit(PACKET_LRA_VALID, &pd->flags);
1646 pd->lra = 0xffffffff;
1647 set_bit(PACKET_LRA_VALID, &pd->flags);
1653 pd->settings.link_loss = 7;
1654 pd->settings.write_type = 0; /* packet */
1655 pd->settings.track_mode = ti.track_mode;
1658 * mode1 or mode2 disc
1660 switch (ti.data_mode) {
1662 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1665 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1668 printk("pktcdvd: unknown data mode\n");
1675 * enable/disable write caching on drive
1677 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
1679 struct packet_command cgc;
1680 struct request_sense sense;
1681 unsigned char buf[64];
1684 memset(buf, 0, sizeof(buf));
1685 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1687 cgc.buflen = pd->mode_offset + 12;
1690 * caching mode page might not be there, so quiet this command
1694 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
1697 buf[pd->mode_offset + 10] |= (!!set << 2);
1699 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1700 ret = pkt_mode_select(pd, &cgc);
1702 printk("pktcdvd: write caching control failed\n");
1703 pkt_dump_sense(&cgc);
1704 } else if (!ret && set)
1705 printk("pktcdvd: enabled write caching on %s\n", pd->name);
1709 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1711 struct packet_command cgc;
1713 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1714 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1715 cgc.cmd[4] = lockflag ? 1 : 0;
1716 return pkt_generic_packet(pd, &cgc);
1720 * Returns drive maximum write speed
1722 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
1724 struct packet_command cgc;
1725 struct request_sense sense;
1726 unsigned char buf[256+18];
1727 unsigned char *cap_buf;
1730 memset(buf, 0, sizeof(buf));
1731 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1732 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1735 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1737 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1738 sizeof(struct mode_page_header);
1739 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1741 pkt_dump_sense(&cgc);
1746 offset = 20; /* Obsoleted field, used by older drives */
1747 if (cap_buf[1] >= 28)
1748 offset = 28; /* Current write speed selected */
1749 if (cap_buf[1] >= 30) {
1750 /* If the drive reports at least one "Logical Unit Write
1751 * Speed Performance Descriptor Block", use the information
1752 * in the first block. (contains the highest speed)
1754 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1759 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1763 /* These tables from cdrecord - I don't have orange book */
1764 /* standard speed CD-RW (1-4x) */
1765 static char clv_to_speed[16] = {
1766 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1767 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1769 /* high speed CD-RW (-10x) */
1770 static char hs_clv_to_speed[16] = {
1771 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1772 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1774 /* ultra high speed CD-RW */
1775 static char us_clv_to_speed[16] = {
1776 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1777 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
1781 * reads the maximum media speed from ATIP
1783 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
1785 struct packet_command cgc;
1786 struct request_sense sense;
1787 unsigned char buf[64];
1788 unsigned int size, st, sp;
1791 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
1793 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1795 cgc.cmd[2] = 4; /* READ ATIP */
1797 ret = pkt_generic_packet(pd, &cgc);
1799 pkt_dump_sense(&cgc);
1802 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
1803 if (size > sizeof(buf))
1806 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
1808 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
1812 ret = pkt_generic_packet(pd, &cgc);
1814 pkt_dump_sense(&cgc);
1818 if (!buf[6] & 0x40) {
1819 printk("pktcdvd: Disc type is not CD-RW\n");
1822 if (!buf[6] & 0x4) {
1823 printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n");
1827 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
1829 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
1831 /* Info from cdrecord */
1833 case 0: /* standard speed */
1834 *speed = clv_to_speed[sp];
1836 case 1: /* high speed */
1837 *speed = hs_clv_to_speed[sp];
1839 case 2: /* ultra high speed */
1840 *speed = us_clv_to_speed[sp];
1843 printk("pktcdvd: Unknown disc sub-type %d\n",st);
1847 printk("pktcdvd: Max. media speed: %d\n",*speed);
1850 printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp,st);
1855 static int pkt_perform_opc(struct pktcdvd_device *pd)
1857 struct packet_command cgc;
1858 struct request_sense sense;
1861 VPRINTK("pktcdvd: Performing OPC\n");
1863 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1865 cgc.timeout = 60*HZ;
1866 cgc.cmd[0] = GPCMD_SEND_OPC;
1868 if ((ret = pkt_generic_packet(pd, &cgc)))
1869 pkt_dump_sense(&cgc);
1873 static int pkt_open_write(struct pktcdvd_device *pd)
1876 unsigned int write_speed, media_write_speed, read_speed;
1878 if ((ret = pkt_probe_settings(pd))) {
1879 DPRINTK("pktcdvd: %s failed probe\n", pd->name);
1883 if ((ret = pkt_set_write_settings(pd))) {
1884 DPRINTK("pktcdvd: %s failed saving write settings\n", pd->name);
1888 pkt_write_caching(pd, USE_WCACHING);
1890 if ((ret = pkt_get_max_speed(pd, &write_speed)))
1891 write_speed = 16 * 177;
1892 switch (pd->mmc3_profile) {
1893 case 0x13: /* DVD-RW */
1894 case 0x1a: /* DVD+RW */
1895 DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
1898 if ((ret = pkt_media_speed(pd, &media_write_speed)))
1899 media_write_speed = 16;
1900 write_speed = min(write_speed, media_write_speed * 177);
1901 DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176);
1904 read_speed = write_speed;
1906 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
1907 DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
1910 pd->write_speed = write_speed;
1911 pd->read_speed = read_speed;
1913 if ((ret = pkt_perform_opc(pd))) {
1914 DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd->name);
1921 * called at open time.
1923 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
1930 * We need to re-open the cdrom device without O_NONBLOCK to be able
1931 * to read/write from/to it. It is already opened in O_NONBLOCK mode
1932 * so bdget() can't fail.
1934 bdget(pd->bdev->bd_dev);
1935 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
1938 if ((ret = pkt_get_last_written(pd, &lba))) {
1939 printk("pktcdvd: pkt_get_last_written failed\n");
1943 set_capacity(pd->disk, lba << 2);
1944 set_capacity(pd->bdev->bd_disk, lba << 2);
1945 bd_set_size(pd->bdev, (loff_t)lba << 11);
1947 q = bdev_get_queue(pd->bdev);
1949 if ((ret = pkt_open_write(pd)))
1952 * Some CDRW drives can not handle writes larger than one packet,
1953 * even if the size is a multiple of the packet size.
1955 spin_lock_irq(q->queue_lock);
1956 blk_queue_max_sectors(q, pd->settings.size);
1957 spin_unlock_irq(q->queue_lock);
1958 set_bit(PACKET_WRITABLE, &pd->flags);
1960 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1961 clear_bit(PACKET_WRITABLE, &pd->flags);
1964 if ((ret = pkt_set_segment_merging(pd, q)))
1968 printk("pktcdvd: %lukB available on disc\n", lba << 1);
1973 blkdev_put(pd->bdev);
1979 * called when the device is closed. makes sure that the device flushes
1980 * the internal cache before we close.
1982 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
1984 if (flush && pkt_flush_cache(pd))
1985 DPRINTK("pktcdvd: %s not flushing cache\n", pd->name);
1987 pkt_lock_door(pd, 0);
1989 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
1990 blkdev_put(pd->bdev);
1993 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
1995 if (dev_minor >= MAX_WRITERS)
1997 return pkt_devs[dev_minor];
2000 static int pkt_open(struct inode *inode, struct file *file)
2002 struct pktcdvd_device *pd = NULL;
2005 VPRINTK("pktcdvd: entering open\n");
2008 pd = pkt_find_dev_from_minor(iminor(inode));
2013 BUG_ON(pd->refcnt < 0);
2016 if (pd->refcnt == 1) {
2017 if (pkt_open_dev(pd, file->f_mode & FMODE_WRITE)) {
2022 * needed here as well, since ext2 (among others) may change
2023 * the blocksize at mount time
2025 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2034 VPRINTK("pktcdvd: failed open (%d)\n", ret);
2039 static int pkt_close(struct inode *inode, struct file *file)
2041 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2046 BUG_ON(pd->refcnt < 0);
2047 if (pd->refcnt == 0) {
2048 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2049 pkt_release_dev(pd, flush);
2056 static void *psd_pool_alloc(int gfp_mask, void *data)
2058 return kmalloc(sizeof(struct packet_stacked_data), gfp_mask);
2061 static void psd_pool_free(void *ptr, void *data)
2066 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2068 struct packet_stacked_data *psd = bio->bi_private;
2069 struct pktcdvd_device *pd = psd->pd;
2075 bio_endio(psd->bio, psd->bio->bi_size, err);
2076 mempool_free(psd, psd_pool);
2077 pkt_bio_finished(pd);
2081 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2083 struct pktcdvd_device *pd;
2084 char b[BDEVNAME_SIZE];
2086 struct packet_data *pkt;
2087 int was_empty, blocked_bio;
2088 struct pkt_rb_node *node;
2092 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2097 * Clone READ bios so we can have our own bi_end_io callback.
2099 if (bio_data_dir(bio) == READ) {
2100 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2101 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2105 cloned_bio->bi_bdev = pd->bdev;
2106 cloned_bio->bi_private = psd;
2107 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2108 pd->stats.secs_r += bio->bi_size >> 9;
2109 pkt_queue_bio(pd, cloned_bio, 1);
2113 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2114 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2115 pd->name, (unsigned long long)bio->bi_sector);
2119 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2120 printk("pktcdvd: wrong bio size\n");
2124 blk_queue_bounce(q, &bio);
2126 zone = ZONE(bio->bi_sector, pd);
2127 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2128 (unsigned long long)bio->bi_sector,
2129 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2131 /* Check if we have to split the bio */
2133 struct bio_pair *bp;
2137 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2138 if (last_zone != zone) {
2139 BUG_ON(last_zone != zone + pd->settings.size);
2140 first_sectors = last_zone - bio->bi_sector;
2141 bp = bio_split(bio, bio_split_pool, first_sectors);
2143 pkt_make_request(q, &bp->bio1);
2144 pkt_make_request(q, &bp->bio2);
2145 bio_pair_release(bp);
2151 * If we find a matching packet in state WAITING or READ_WAIT, we can
2152 * just append this bio to that packet.
2154 spin_lock(&pd->cdrw.active_list_lock);
2156 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2157 if (pkt->sector == zone) {
2158 spin_lock(&pkt->lock);
2159 if ((pkt->state == PACKET_WAITING_STATE) ||
2160 (pkt->state == PACKET_READ_WAIT_STATE)) {
2161 pkt_add_list_last(bio, &pkt->orig_bios,
2162 &pkt->orig_bios_tail);
2163 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2164 if ((pkt->write_size >= pkt->frames) &&
2165 (pkt->state == PACKET_WAITING_STATE)) {
2166 atomic_inc(&pkt->run_sm);
2167 wake_up(&pd->wqueue);
2169 spin_unlock(&pkt->lock);
2170 spin_unlock(&pd->cdrw.active_list_lock);
2175 spin_unlock(&pkt->lock);
2178 spin_unlock(&pd->cdrw.active_list_lock);
2181 * No matching packet found. Store the bio in the work queue.
2183 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2186 spin_lock(&pd->lock);
2187 BUG_ON(pd->bio_queue_size < 0);
2188 was_empty = (pd->bio_queue_size == 0);
2189 pkt_rbtree_insert(pd, node);
2190 spin_unlock(&pd->lock);
2193 * Wake up the worker thread.
2195 atomic_set(&pd->scan_queue, 1);
2197 /* This wake_up is required for correct operation */
2198 wake_up(&pd->wqueue);
2199 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2201 * This wake up is not required for correct operation,
2202 * but improves performance in some cases.
2204 wake_up(&pd->wqueue);
2208 bio_io_error(bio, bio->bi_size);
2214 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2216 struct pktcdvd_device *pd = q->queuedata;
2217 sector_t zone = ZONE(bio->bi_sector, pd);
2218 int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2219 int remaining = (pd->settings.size << 9) - used;
2223 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2224 * boundary, pkt_make_request() will split the bio.
2226 remaining2 = PAGE_SIZE - bio->bi_size;
2227 remaining = max(remaining, remaining2);
2229 BUG_ON(remaining < 0);
2233 static void pkt_init_queue(struct pktcdvd_device *pd)
2235 request_queue_t *q = pd->disk->queue;
2237 blk_queue_make_request(q, pkt_make_request);
2238 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2239 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2240 blk_queue_merge_bvec(q, pkt_merge_bvec);
2244 static int pkt_seq_show(struct seq_file *m, void *p)
2246 struct pktcdvd_device *pd = m->private;
2248 char bdev_buf[BDEVNAME_SIZE];
2249 int states[PACKET_NUM_STATES];
2251 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2252 bdevname(pd->bdev, bdev_buf));
2254 seq_printf(m, "\nSettings:\n");
2255 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2257 if (pd->settings.write_type == 0)
2261 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2263 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2264 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2266 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2268 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2270 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2274 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2276 seq_printf(m, "\nStatistics:\n");
2277 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2278 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2279 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2280 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2281 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2283 seq_printf(m, "\nMisc:\n");
2284 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2285 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2286 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2287 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2288 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2289 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2291 seq_printf(m, "\nQueue state:\n");
2292 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2293 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2294 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2296 pkt_count_states(pd, states);
2297 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2298 states[0], states[1], states[2], states[3], states[4], states[5]);
2303 static int pkt_seq_open(struct inode *inode, struct file *file)
2305 return single_open(file, pkt_seq_show, PDE(inode)->data);
2308 static struct file_operations pkt_proc_fops = {
2309 .open = pkt_seq_open,
2311 .llseek = seq_lseek,
2312 .release = single_release
2315 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2319 char b[BDEVNAME_SIZE];
2320 struct proc_dir_entry *proc;
2321 struct block_device *bdev;
2323 if (pd->pkt_dev == dev) {
2324 printk("pktcdvd: Recursive setup not allowed\n");
2327 for (i = 0; i < MAX_WRITERS; i++) {
2328 struct pktcdvd_device *pd2 = pkt_devs[i];
2331 if (pd2->bdev->bd_dev == dev) {
2332 printk("pktcdvd: %s already setup\n", bdevname(pd2->bdev, b));
2335 if (pd2->pkt_dev == dev) {
2336 printk("pktcdvd: Can't chain pktcdvd devices\n");
2344 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2348 /* This is safe, since we have a reference from open(). */
2349 __module_get(THIS_MODULE);
2351 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2352 printk("pktcdvd: not enough memory for buffers\n");
2358 set_blocksize(bdev, CD_FRAMESIZE);
2362 atomic_set(&pd->cdrw.pending_bios, 0);
2363 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2364 if (IS_ERR(pd->cdrw.thread)) {
2365 printk("pktcdvd: can't start kernel thread\n");
2370 proc = create_proc_entry(pd->name, 0, pkt_proc);
2373 proc->proc_fops = &pkt_proc_fops;
2375 DPRINTK("pktcdvd: writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2379 pkt_shrink_pktlist(pd);
2382 /* This is safe: open() is still holding a reference. */
2383 module_put(THIS_MODULE);
2387 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2389 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2391 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2396 * forward selected CDROM ioctls to CD-ROM, for UDF
2398 case CDROMMULTISESSION:
2399 case CDROMREADTOCENTRY:
2400 case CDROM_LAST_WRITTEN:
2401 case CDROM_SEND_PACKET:
2402 case SCSI_IOCTL_SEND_COMMAND:
2403 return ioctl_by_bdev(pd->bdev, cmd, arg);
2407 * The door gets locked when the device is opened, so we
2408 * have to unlock it or else the eject command fails.
2410 pkt_lock_door(pd, 0);
2411 return ioctl_by_bdev(pd->bdev, cmd, arg);
2414 printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);
2421 static int pkt_media_changed(struct gendisk *disk)
2423 struct pktcdvd_device *pd = disk->private_data;
2424 struct gendisk *attached_disk;
2430 attached_disk = pd->bdev->bd_disk;
2433 return attached_disk->fops->media_changed(attached_disk);
2436 static struct block_device_operations pktcdvd_ops = {
2437 .owner = THIS_MODULE,
2439 .release = pkt_close,
2441 .media_changed = pkt_media_changed,
2445 * Set up mapping from pktcdvd device to CD-ROM device.
2447 static int pkt_setup_dev(struct pkt_ctrl_command *ctrl_cmd)
2451 struct pktcdvd_device *pd;
2452 struct gendisk *disk;
2453 dev_t dev = new_decode_dev(ctrl_cmd->dev);
2455 for (idx = 0; idx < MAX_WRITERS; idx++)
2458 if (idx == MAX_WRITERS) {
2459 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS);
2463 pd = kmalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2466 memset(pd, 0, sizeof(struct pktcdvd_device));
2468 pd->rb_pool = mempool_create(PKT_RB_POOL_SIZE, pkt_rb_alloc, pkt_rb_free, NULL);
2472 disk = alloc_disk(1);
2477 spin_lock_init(&pd->lock);
2478 spin_lock_init(&pd->iosched.lock);
2479 sprintf(pd->name, "pktcdvd%d", idx);
2480 init_waitqueue_head(&pd->wqueue);
2481 pd->bio_queue = RB_ROOT;
2483 disk->major = pkt_major;
2484 disk->first_minor = idx;
2485 disk->fops = &pktcdvd_ops;
2486 disk->flags = GENHD_FL_REMOVABLE;
2487 sprintf(disk->disk_name, "pktcdvd%d", idx);
2488 disk->private_data = pd;
2489 disk->queue = blk_alloc_queue(GFP_KERNEL);
2493 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2494 ret = pkt_new_dev(pd, dev);
2500 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2504 blk_put_queue(disk->queue);
2509 mempool_destroy(pd->rb_pool);
2515 * Tear down mapping from pktcdvd device to CD-ROM device.
2517 static int pkt_remove_dev(struct pkt_ctrl_command *ctrl_cmd)
2519 struct pktcdvd_device *pd;
2521 dev_t pkt_dev = new_decode_dev(ctrl_cmd->pkt_dev);
2523 for (idx = 0; idx < MAX_WRITERS; idx++) {
2525 if (pd && (pd->pkt_dev == pkt_dev))
2528 if (idx == MAX_WRITERS) {
2529 DPRINTK("pktcdvd: dev not setup\n");
2536 if (!IS_ERR(pd->cdrw.thread))
2537 kthread_stop(pd->cdrw.thread);
2539 blkdev_put(pd->bdev);
2541 pkt_shrink_pktlist(pd);
2543 remove_proc_entry(pd->name, pkt_proc);
2544 DPRINTK("pktcdvd: writer %s unmapped\n", pd->name);
2546 del_gendisk(pd->disk);
2547 blk_put_queue(pd->disk->queue);
2550 pkt_devs[idx] = NULL;
2551 mempool_destroy(pd->rb_pool);
2554 /* This is safe: open() is still holding a reference. */
2555 module_put(THIS_MODULE);
2559 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2561 struct pktcdvd_device *pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2563 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2564 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2567 ctrl_cmd->pkt_dev = 0;
2569 ctrl_cmd->num_devices = MAX_WRITERS;
2572 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2574 void __user *argp = (void __user *)arg;
2575 struct pkt_ctrl_command ctrl_cmd;
2578 if (cmd != PACKET_CTRL_CMD)
2581 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2584 switch (ctrl_cmd.command) {
2585 case PKT_CTRL_CMD_SETUP:
2586 if (!capable(CAP_SYS_ADMIN))
2589 ret = pkt_setup_dev(&ctrl_cmd);
2592 case PKT_CTRL_CMD_TEARDOWN:
2593 if (!capable(CAP_SYS_ADMIN))
2596 ret = pkt_remove_dev(&ctrl_cmd);
2599 case PKT_CTRL_CMD_STATUS:
2601 pkt_get_status(&ctrl_cmd);
2608 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2614 static struct file_operations pkt_ctl_fops = {
2615 .ioctl = pkt_ctl_ioctl,
2616 .owner = THIS_MODULE,
2619 static struct miscdevice pkt_misc = {
2620 .minor = MISC_DYNAMIC_MINOR,
2622 .devfs_name = "pktcdvd/control",
2623 .fops = &pkt_ctl_fops
2626 static int pkt_init(void)
2630 psd_pool = mempool_create(PSD_POOL_SIZE, psd_pool_alloc, psd_pool_free, NULL);
2634 ret = register_blkdev(pkt_major, "pktcdvd");
2636 printk("pktcdvd: Unable to register block device\n");
2642 ret = misc_register(&pkt_misc);
2644 printk("pktcdvd: Unable to register misc device\n");
2648 init_MUTEX(&ctl_mutex);
2650 pkt_proc = proc_mkdir("pktcdvd", proc_root_driver);
2652 DPRINTK("pktcdvd: %s\n", VERSION_CODE);
2656 unregister_blkdev(pkt_major, "pktcdvd");
2658 mempool_destroy(psd_pool);
2662 static void pkt_exit(void)
2664 remove_proc_entry("pktcdvd", proc_root_driver);
2665 misc_deregister(&pkt_misc);
2666 unregister_blkdev(pkt_major, "pktcdvd");
2667 mempool_destroy(psd_pool);
2670 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2671 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2672 MODULE_LICENSE("GPL");
2674 module_init(pkt_init);
2675 module_exit(pkt_exit);