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
);