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-RW, DVD+RW, DVD-RW and
11 * Theory of operation:
13 * At the lowest level, there is the standard driver for the CD/DVD device,
14 * typically ide-cd.c or sr.c. This driver can handle read and write requests,
15 * but it doesn't know anything about the special restrictions that apply to
16 * packet writing. One restriction is that write requests must be aligned to
17 * packet boundaries on the physical media, and the size of a write request
18 * must be equal to the packet size. Another restriction is that a
19 * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
20 * command, if the previous command was a write.
22 * The purpose of the packet writing driver is to hide these restrictions from
23 * higher layers, such as file systems, and present a block device that can be
24 * randomly read and written using 2kB-sized blocks.
26 * The lowest layer in the packet writing driver is the packet I/O scheduler.
27 * Its data is defined by the struct packet_iosched and includes two bio
28 * queues with pending read and write requests. These queues are processed
29 * by the pkt_iosched_process_queue() function. The write requests in this
30 * queue are already properly aligned and sized. This layer is responsible for
31 * issuing the flush cache commands and scheduling the I/O in a good order.
33 * The next layer transforms unaligned write requests to aligned writes. This
34 * transformation requires reading missing pieces of data from the underlying
35 * block device, assembling the pieces to full packets and queuing them to the
36 * packet I/O scheduler.
38 * At the top layer there is a custom make_request_fn function that forwards
39 * read requests directly to the iosched queue and puts write requests in the
40 * unaligned write queue. A kernel thread performs the necessary read
41 * gathering to convert the unaligned writes to aligned writes and then feeds
42 * them to the packet I/O scheduler.
44 *************************************************************************/
46 #include <linux/pktcdvd.h>
47 #include <linux/config.h>
48 #include <linux/module.h>
49 #include <linux/types.h>
50 #include <linux/kernel.h>
51 #include <linux/kthread.h>
52 #include <linux/errno.h>
53 #include <linux/spinlock.h>
54 #include <linux/file.h>
55 #include <linux/proc_fs.h>
56 #include <linux/seq_file.h>
57 #include <linux/miscdevice.h>
58 #include <linux/suspend.h>
59 #include <scsi/scsi_cmnd.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/scsi.h>
63 #include <asm/uaccess.h>
66 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
68 #define DPRINTK(fmt, args...)
72 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
74 #define VPRINTK(fmt, args...)
77 #define MAX_SPEED 0xffff
79 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
81 static struct pktcdvd_device
*pkt_devs
[MAX_WRITERS
];
82 static struct proc_dir_entry
*pkt_proc
;
84 static struct semaphore ctl_mutex
; /* Serialize open/close/setup/teardown */
85 static mempool_t
*psd_pool
;
88 static void pkt_bio_finished(struct pktcdvd_device
*pd
)
90 BUG_ON(atomic_read(&pd
->cdrw
.pending_bios
) <= 0);
91 if (atomic_dec_and_test(&pd
->cdrw
.pending_bios
)) {
92 VPRINTK("pktcdvd: queue empty\n");
93 atomic_set(&pd
->iosched
.attention
, 1);
98 static void pkt_bio_destructor(struct bio
*bio
)
100 kfree(bio
->bi_io_vec
);
104 static struct bio
*pkt_bio_alloc(int nr_iovecs
)
106 struct bio_vec
*bvl
= NULL
;
109 bio
= kmalloc(sizeof(struct bio
), GFP_KERNEL
);
114 bvl
= kcalloc(nr_iovecs
, sizeof(struct bio_vec
), GFP_KERNEL
);
118 bio
->bi_max_vecs
= nr_iovecs
;
119 bio
->bi_io_vec
= bvl
;
120 bio
->bi_destructor
= pkt_bio_destructor
;
131 * Allocate a packet_data struct
133 static struct packet_data
*pkt_alloc_packet_data(int frames
)
136 struct packet_data
*pkt
;
138 pkt
= kzalloc(sizeof(struct packet_data
), GFP_KERNEL
);
142 pkt
->frames
= frames
;
143 pkt
->w_bio
= pkt_bio_alloc(frames
);
147 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++) {
148 pkt
->pages
[i
] = alloc_page(GFP_KERNEL
|__GFP_ZERO
);
153 spin_lock_init(&pkt
->lock
);
155 for (i
= 0; i
< frames
; i
++) {
156 struct bio
*bio
= pkt_bio_alloc(1);
159 pkt
->r_bios
[i
] = bio
;
165 for (i
= 0; i
< frames
; i
++) {
166 struct bio
*bio
= pkt
->r_bios
[i
];
172 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++)
174 __free_page(pkt
->pages
[i
]);
183 * Free a packet_data struct
185 static void pkt_free_packet_data(struct packet_data
*pkt
)
189 for (i
= 0; i
< pkt
->frames
; i
++) {
190 struct bio
*bio
= pkt
->r_bios
[i
];
194 for (i
= 0; i
< pkt
->frames
/ FRAMES_PER_PAGE
; i
++)
195 __free_page(pkt
->pages
[i
]);
200 static void pkt_shrink_pktlist(struct pktcdvd_device
*pd
)
202 struct packet_data
*pkt
, *next
;
204 BUG_ON(!list_empty(&pd
->cdrw
.pkt_active_list
));
206 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_free_list
, list
) {
207 pkt_free_packet_data(pkt
);
209 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
212 static int pkt_grow_pktlist(struct pktcdvd_device
*pd
, int nr_packets
)
214 struct packet_data
*pkt
;
216 BUG_ON(!list_empty(&pd
->cdrw
.pkt_free_list
));
218 while (nr_packets
> 0) {
219 pkt
= pkt_alloc_packet_data(pd
->settings
.size
>> 2);
221 pkt_shrink_pktlist(pd
);
224 pkt
->id
= nr_packets
;
226 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
232 static void *pkt_rb_alloc(gfp_t gfp_mask
, void *data
)
234 return kmalloc(sizeof(struct pkt_rb_node
), gfp_mask
);
237 static void pkt_rb_free(void *ptr
, void *data
)
242 static inline struct pkt_rb_node
*pkt_rbtree_next(struct pkt_rb_node
*node
)
244 struct rb_node
*n
= rb_next(&node
->rb_node
);
247 return rb_entry(n
, struct pkt_rb_node
, rb_node
);
250 static void pkt_rbtree_erase(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
252 rb_erase(&node
->rb_node
, &pd
->bio_queue
);
253 mempool_free(node
, pd
->rb_pool
);
254 pd
->bio_queue_size
--;
255 BUG_ON(pd
->bio_queue_size
< 0);
259 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
261 static struct pkt_rb_node
*pkt_rbtree_find(struct pktcdvd_device
*pd
, sector_t s
)
263 struct rb_node
*n
= pd
->bio_queue
.rb_node
;
264 struct rb_node
*next
;
265 struct pkt_rb_node
*tmp
;
268 BUG_ON(pd
->bio_queue_size
> 0);
273 tmp
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
274 if (s
<= tmp
->bio
->bi_sector
)
283 if (s
> tmp
->bio
->bi_sector
) {
284 tmp
= pkt_rbtree_next(tmp
);
288 BUG_ON(s
> tmp
->bio
->bi_sector
);
293 * Insert a node into the pd->bio_queue rb tree.
295 static void pkt_rbtree_insert(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
297 struct rb_node
**p
= &pd
->bio_queue
.rb_node
;
298 struct rb_node
*parent
= NULL
;
299 sector_t s
= node
->bio
->bi_sector
;
300 struct pkt_rb_node
*tmp
;
304 tmp
= rb_entry(parent
, struct pkt_rb_node
, rb_node
);
305 if (s
< tmp
->bio
->bi_sector
)
310 rb_link_node(&node
->rb_node
, parent
, p
);
311 rb_insert_color(&node
->rb_node
, &pd
->bio_queue
);
312 pd
->bio_queue_size
++;
316 * Add a bio to a single linked list defined by its head and tail pointers.
318 static void pkt_add_list_last(struct bio
*bio
, struct bio
**list_head
, struct bio
**list_tail
)
322 BUG_ON((*list_head
) == NULL
);
323 (*list_tail
)->bi_next
= bio
;
326 BUG_ON((*list_head
) != NULL
);
333 * Remove and return the first bio from a single linked list defined by its
334 * head and tail pointers.
336 static inline struct bio
*pkt_get_list_first(struct bio
**list_head
, struct bio
**list_tail
)
340 if (*list_head
== NULL
)
344 *list_head
= bio
->bi_next
;
345 if (*list_head
== NULL
)
353 * Send a packet_command to the underlying block device and
354 * wait for completion.
356 static int pkt_generic_packet(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
358 char sense
[SCSI_SENSE_BUFFERSIZE
];
361 DECLARE_COMPLETION(wait
);
364 q
= bdev_get_queue(pd
->bdev
);
366 rq
= blk_get_request(q
, (cgc
->data_direction
== CGC_DATA_WRITE
) ? WRITE
: READ
,
369 rq
->rq_disk
= pd
->bdev
->bd_disk
;
373 rq
->data
= cgc
->buffer
;
374 rq
->data_len
= cgc
->buflen
;
376 memset(sense
, 0, sizeof(sense
));
378 rq
->flags
|= REQ_BLOCK_PC
| REQ_HARDBARRIER
;
380 rq
->flags
|= REQ_QUIET
;
381 memcpy(rq
->cmd
, cgc
->cmd
, CDROM_PACKET_SIZE
);
382 if (sizeof(rq
->cmd
) > CDROM_PACKET_SIZE
)
383 memset(rq
->cmd
+ CDROM_PACKET_SIZE
, 0, sizeof(rq
->cmd
) - CDROM_PACKET_SIZE
);
384 rq
->cmd_len
= COMMAND_SIZE(rq
->cmd
[0]);
387 rq
->flags
|= REQ_NOMERGE
;
389 rq
->end_io
= blk_end_sync_rq
;
390 elv_add_request(q
, rq
, ELEVATOR_INSERT_BACK
, 1);
391 generic_unplug_device(q
);
392 wait_for_completion(&wait
);
402 * A generic sense dump / resolve mechanism should be implemented across
403 * all ATAPI + SCSI devices.
405 static void pkt_dump_sense(struct packet_command
*cgc
)
407 static char *info
[9] = { "No sense", "Recovered error", "Not ready",
408 "Medium error", "Hardware error", "Illegal request",
409 "Unit attention", "Data protect", "Blank check" };
411 struct request_sense
*sense
= cgc
->sense
;
414 for (i
= 0; i
< CDROM_PACKET_SIZE
; i
++)
415 printk(" %02x", cgc
->cmd
[i
]);
419 printk("no sense\n");
423 printk("sense %02x.%02x.%02x", sense
->sense_key
, sense
->asc
, sense
->ascq
);
425 if (sense
->sense_key
> 8) {
426 printk(" (INVALID)\n");
430 printk(" (%s)\n", info
[sense
->sense_key
]);
434 * flush the drive cache to media
436 static int pkt_flush_cache(struct pktcdvd_device
*pd
)
438 struct packet_command cgc
;
440 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
441 cgc
.cmd
[0] = GPCMD_FLUSH_CACHE
;
445 * the IMMED bit -- we default to not setting it, although that
446 * would allow a much faster close, this is safer
451 return pkt_generic_packet(pd
, &cgc
);
455 * speed is given as the normal factor, e.g. 4 for 4x
457 static int pkt_set_speed(struct pktcdvd_device
*pd
, unsigned write_speed
, unsigned read_speed
)
459 struct packet_command cgc
;
460 struct request_sense sense
;
463 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
465 cgc
.cmd
[0] = GPCMD_SET_SPEED
;
466 cgc
.cmd
[2] = (read_speed
>> 8) & 0xff;
467 cgc
.cmd
[3] = read_speed
& 0xff;
468 cgc
.cmd
[4] = (write_speed
>> 8) & 0xff;
469 cgc
.cmd
[5] = write_speed
& 0xff;
471 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
472 pkt_dump_sense(&cgc
);
478 * Queue a bio for processing by the low-level CD device. Must be called
479 * from process context.
481 static void pkt_queue_bio(struct pktcdvd_device
*pd
, struct bio
*bio
)
483 spin_lock(&pd
->iosched
.lock
);
484 if (bio_data_dir(bio
) == READ
) {
485 pkt_add_list_last(bio
, &pd
->iosched
.read_queue
,
486 &pd
->iosched
.read_queue_tail
);
488 pkt_add_list_last(bio
, &pd
->iosched
.write_queue
,
489 &pd
->iosched
.write_queue_tail
);
491 spin_unlock(&pd
->iosched
.lock
);
493 atomic_set(&pd
->iosched
.attention
, 1);
494 wake_up(&pd
->wqueue
);
498 * Process the queued read/write requests. This function handles special
499 * requirements for CDRW drives:
500 * - A cache flush command must be inserted before a read request if the
501 * previous request was a write.
502 * - Switching between reading and writing is slow, so don't do it more often
504 * - Optimize for throughput at the expense of latency. This means that streaming
505 * writes will never be interrupted by a read, but if the drive has to seek
506 * before the next write, switch to reading instead if there are any pending
508 * - Set the read speed according to current usage pattern. When only reading
509 * from the device, it's best to use the highest possible read speed, but
510 * when switching often between reading and writing, it's better to have the
511 * same read and write speeds.
513 static void pkt_iosched_process_queue(struct pktcdvd_device
*pd
)
516 if (atomic_read(&pd
->iosched
.attention
) == 0)
518 atomic_set(&pd
->iosched
.attention
, 0);
522 int reads_queued
, writes_queued
;
524 spin_lock(&pd
->iosched
.lock
);
525 reads_queued
= (pd
->iosched
.read_queue
!= NULL
);
526 writes_queued
= (pd
->iosched
.write_queue
!= NULL
);
527 spin_unlock(&pd
->iosched
.lock
);
529 if (!reads_queued
&& !writes_queued
)
532 if (pd
->iosched
.writing
) {
533 int need_write_seek
= 1;
534 spin_lock(&pd
->iosched
.lock
);
535 bio
= pd
->iosched
.write_queue
;
536 spin_unlock(&pd
->iosched
.lock
);
537 if (bio
&& (bio
->bi_sector
== pd
->iosched
.last_write
))
539 if (need_write_seek
&& reads_queued
) {
540 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
541 VPRINTK("pktcdvd: write, waiting\n");
545 pd
->iosched
.writing
= 0;
548 if (!reads_queued
&& writes_queued
) {
549 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
550 VPRINTK("pktcdvd: read, waiting\n");
553 pd
->iosched
.writing
= 1;
557 spin_lock(&pd
->iosched
.lock
);
558 if (pd
->iosched
.writing
) {
559 bio
= pkt_get_list_first(&pd
->iosched
.write_queue
,
560 &pd
->iosched
.write_queue_tail
);
562 bio
= pkt_get_list_first(&pd
->iosched
.read_queue
,
563 &pd
->iosched
.read_queue_tail
);
565 spin_unlock(&pd
->iosched
.lock
);
570 if (bio_data_dir(bio
) == READ
)
571 pd
->iosched
.successive_reads
+= bio
->bi_size
>> 10;
573 pd
->iosched
.successive_reads
= 0;
574 pd
->iosched
.last_write
= bio
->bi_sector
+ bio_sectors(bio
);
576 if (pd
->iosched
.successive_reads
>= HI_SPEED_SWITCH
) {
577 if (pd
->read_speed
== pd
->write_speed
) {
578 pd
->read_speed
= MAX_SPEED
;
579 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
582 if (pd
->read_speed
!= pd
->write_speed
) {
583 pd
->read_speed
= pd
->write_speed
;
584 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
588 atomic_inc(&pd
->cdrw
.pending_bios
);
589 generic_make_request(bio
);
594 * Special care is needed if the underlying block device has a small
595 * max_phys_segments value.
597 static int pkt_set_segment_merging(struct pktcdvd_device
*pd
, request_queue_t
*q
)
599 if ((pd
->settings
.size
<< 9) / CD_FRAMESIZE
<= q
->max_phys_segments
) {
601 * The cdrom device can handle one segment/frame
603 clear_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
605 } else if ((pd
->settings
.size
<< 9) / PAGE_SIZE
<= q
->max_phys_segments
) {
607 * We can handle this case at the expense of some extra memory
608 * copies during write operations
610 set_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
613 printk("pktcdvd: cdrom max_phys_segments too small\n");
619 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
621 static void pkt_copy_bio_data(struct bio
*src_bio
, int seg
, int offs
, struct page
*dst_page
, int dst_offs
)
623 unsigned int copy_size
= CD_FRAMESIZE
;
625 while (copy_size
> 0) {
626 struct bio_vec
*src_bvl
= bio_iovec_idx(src_bio
, seg
);
627 void *vfrom
= kmap_atomic(src_bvl
->bv_page
, KM_USER0
) +
628 src_bvl
->bv_offset
+ offs
;
629 void *vto
= page_address(dst_page
) + dst_offs
;
630 int len
= min_t(int, copy_size
, src_bvl
->bv_len
- offs
);
633 memcpy(vto
, vfrom
, len
);
634 kunmap_atomic(vfrom
, KM_USER0
);
644 * Copy all data for this packet to pkt->pages[], so that
645 * a) The number of required segments for the write bio is minimized, which
646 * is necessary for some scsi controllers.
647 * b) The data can be used as cache to avoid read requests if we receive a
648 * new write request for the same zone.
650 static void pkt_make_local_copy(struct packet_data
*pkt
, struct bio_vec
*bvec
)
654 /* Copy all data to pkt->pages[] */
657 for (f
= 0; f
< pkt
->frames
; f
++) {
658 if (bvec
[f
].bv_page
!= pkt
->pages
[p
]) {
659 void *vfrom
= kmap_atomic(bvec
[f
].bv_page
, KM_USER0
) + bvec
[f
].bv_offset
;
660 void *vto
= page_address(pkt
->pages
[p
]) + offs
;
661 memcpy(vto
, vfrom
, CD_FRAMESIZE
);
662 kunmap_atomic(vfrom
, KM_USER0
);
663 bvec
[f
].bv_page
= pkt
->pages
[p
];
664 bvec
[f
].bv_offset
= offs
;
666 BUG_ON(bvec
[f
].bv_offset
!= offs
);
668 offs
+= CD_FRAMESIZE
;
669 if (offs
>= PAGE_SIZE
) {
676 static int pkt_end_io_read(struct bio
*bio
, unsigned int bytes_done
, int err
)
678 struct packet_data
*pkt
= bio
->bi_private
;
679 struct pktcdvd_device
*pd
= pkt
->pd
;
685 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio
,
686 (unsigned long long)pkt
->sector
, (unsigned long long)bio
->bi_sector
, err
);
689 atomic_inc(&pkt
->io_errors
);
690 if (atomic_dec_and_test(&pkt
->io_wait
)) {
691 atomic_inc(&pkt
->run_sm
);
692 wake_up(&pd
->wqueue
);
694 pkt_bio_finished(pd
);
699 static int pkt_end_io_packet_write(struct bio
*bio
, unsigned int bytes_done
, int err
)
701 struct packet_data
*pkt
= bio
->bi_private
;
702 struct pktcdvd_device
*pd
= pkt
->pd
;
708 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt
->id
, err
);
710 pd
->stats
.pkt_ended
++;
712 pkt_bio_finished(pd
);
713 atomic_dec(&pkt
->io_wait
);
714 atomic_inc(&pkt
->run_sm
);
715 wake_up(&pd
->wqueue
);
720 * Schedule reads for the holes in a packet
722 static void pkt_gather_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
727 char written
[PACKET_MAX_SIZE
];
729 BUG_ON(!pkt
->orig_bios
);
731 atomic_set(&pkt
->io_wait
, 0);
732 atomic_set(&pkt
->io_errors
, 0);
735 * Figure out which frames we need to read before we can write.
737 memset(written
, 0, sizeof(written
));
738 spin_lock(&pkt
->lock
);
739 for (bio
= pkt
->orig_bios
; bio
; bio
= bio
->bi_next
) {
740 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
741 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
742 pd
->stats
.secs_w
+= num_frames
* (CD_FRAMESIZE
>> 9);
743 BUG_ON(first_frame
< 0);
744 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
745 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++)
748 spin_unlock(&pkt
->lock
);
750 if (pkt
->cache_valid
) {
751 VPRINTK("pkt_gather_data: zone %llx cached\n",
752 (unsigned long long)pkt
->sector
);
757 * Schedule reads for missing parts of the packet.
759 for (f
= 0; f
< pkt
->frames
; f
++) {
763 bio
= pkt
->r_bios
[f
];
765 bio
->bi_max_vecs
= 1;
766 bio
->bi_sector
= pkt
->sector
+ f
* (CD_FRAMESIZE
>> 9);
767 bio
->bi_bdev
= pd
->bdev
;
768 bio
->bi_end_io
= pkt_end_io_read
;
769 bio
->bi_private
= pkt
;
771 p
= (f
* CD_FRAMESIZE
) / PAGE_SIZE
;
772 offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
773 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
774 f
, pkt
->pages
[p
], offset
);
775 if (!bio_add_page(bio
, pkt
->pages
[p
], CD_FRAMESIZE
, offset
))
778 atomic_inc(&pkt
->io_wait
);
780 pkt_queue_bio(pd
, bio
);
785 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
786 frames_read
, (unsigned long long)pkt
->sector
);
787 pd
->stats
.pkt_started
++;
788 pd
->stats
.secs_rg
+= frames_read
* (CD_FRAMESIZE
>> 9);
792 * Find a packet matching zone, or the least recently used packet if
795 static struct packet_data
*pkt_get_packet_data(struct pktcdvd_device
*pd
, int zone
)
797 struct packet_data
*pkt
;
799 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_free_list
, list
) {
800 if (pkt
->sector
== zone
|| pkt
->list
.next
== &pd
->cdrw
.pkt_free_list
) {
801 list_del_init(&pkt
->list
);
802 if (pkt
->sector
!= zone
)
803 pkt
->cache_valid
= 0;
811 static void pkt_put_packet_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
813 if (pkt
->cache_valid
) {
814 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
816 list_add_tail(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
821 * recover a failed write, query for relocation if possible
823 * returns 1 if recovery is possible, or 0 if not
826 static int pkt_start_recovery(struct packet_data
*pkt
)
829 * FIXME. We need help from the file system to implement
834 struct request
*rq
= pkt
->rq
;
835 struct pktcdvd_device
*pd
= rq
->rq_disk
->private_data
;
836 struct block_device
*pkt_bdev
;
837 struct super_block
*sb
= NULL
;
838 unsigned long old_block
, new_block
;
841 pkt_bdev
= bdget(kdev_t_to_nr(pd
->pkt_dev
));
843 sb
= get_super(pkt_bdev
);
850 if (!sb
->s_op
|| !sb
->s_op
->relocate_blocks
)
853 old_block
= pkt
->sector
/ (CD_FRAMESIZE
>> 9);
854 if (sb
->s_op
->relocate_blocks(sb
, old_block
, &new_block
))
857 new_sector
= new_block
* (CD_FRAMESIZE
>> 9);
858 pkt
->sector
= new_sector
;
860 pkt
->bio
->bi_sector
= new_sector
;
861 pkt
->bio
->bi_next
= NULL
;
862 pkt
->bio
->bi_flags
= 1 << BIO_UPTODATE
;
863 pkt
->bio
->bi_idx
= 0;
865 BUG_ON(pkt
->bio
->bi_rw
!= (1 << BIO_RW
));
866 BUG_ON(pkt
->bio
->bi_vcnt
!= pkt
->frames
);
867 BUG_ON(pkt
->bio
->bi_size
!= pkt
->frames
* CD_FRAMESIZE
);
868 BUG_ON(pkt
->bio
->bi_end_io
!= pkt_end_io_packet_write
);
869 BUG_ON(pkt
->bio
->bi_private
!= pkt
);
880 static inline void pkt_set_state(struct packet_data
*pkt
, enum packet_data_state state
)
883 static const char *state_name
[] = {
884 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
886 enum packet_data_state old_state
= pkt
->state
;
887 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt
->id
, (unsigned long long)pkt
->sector
,
888 state_name
[old_state
], state_name
[state
]);
894 * Scan the work queue to see if we can start a new packet.
895 * returns non-zero if any work was done.
897 static int pkt_handle_queue(struct pktcdvd_device
*pd
)
899 struct packet_data
*pkt
, *p
;
900 struct bio
*bio
= NULL
;
901 sector_t zone
= 0; /* Suppress gcc warning */
902 struct pkt_rb_node
*node
, *first_node
;
905 VPRINTK("handle_queue\n");
907 atomic_set(&pd
->scan_queue
, 0);
909 if (list_empty(&pd
->cdrw
.pkt_free_list
)) {
910 VPRINTK("handle_queue: no pkt\n");
915 * Try to find a zone we are not already working on.
917 spin_lock(&pd
->lock
);
918 first_node
= pkt_rbtree_find(pd
, pd
->current_sector
);
920 n
= rb_first(&pd
->bio_queue
);
922 first_node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
927 zone
= ZONE(bio
->bi_sector
, pd
);
928 list_for_each_entry(p
, &pd
->cdrw
.pkt_active_list
, list
) {
929 if (p
->sector
== zone
) {
936 node
= pkt_rbtree_next(node
);
938 n
= rb_first(&pd
->bio_queue
);
940 node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
942 if (node
== first_node
)
945 spin_unlock(&pd
->lock
);
947 VPRINTK("handle_queue: no bio\n");
951 pkt
= pkt_get_packet_data(pd
, zone
);
953 pd
->current_sector
= zone
+ pd
->settings
.size
;
955 BUG_ON(pkt
->frames
!= pd
->settings
.size
>> 2);
959 * Scan work queue for bios in the same zone and link them
962 spin_lock(&pd
->lock
);
963 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone
);
964 while ((node
= pkt_rbtree_find(pd
, zone
)) != NULL
) {
966 VPRINTK("pkt_handle_queue: found zone=%llx\n",
967 (unsigned long long)ZONE(bio
->bi_sector
, pd
));
968 if (ZONE(bio
->bi_sector
, pd
) != zone
)
970 pkt_rbtree_erase(pd
, node
);
971 spin_lock(&pkt
->lock
);
972 pkt_add_list_last(bio
, &pkt
->orig_bios
, &pkt
->orig_bios_tail
);
973 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
974 spin_unlock(&pkt
->lock
);
976 spin_unlock(&pd
->lock
);
978 pkt
->sleep_time
= max(PACKET_WAIT_TIME
, 1);
979 pkt_set_state(pkt
, PACKET_WAITING_STATE
);
980 atomic_set(&pkt
->run_sm
, 1);
982 spin_lock(&pd
->cdrw
.active_list_lock
);
983 list_add(&pkt
->list
, &pd
->cdrw
.pkt_active_list
);
984 spin_unlock(&pd
->cdrw
.active_list_lock
);
990 * Assemble a bio to write one packet and queue the bio for processing
991 * by the underlying block device.
993 static void pkt_start_write(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
998 struct bio_vec
*bvec
= pkt
->w_bio
->bi_io_vec
;
1000 for (f
= 0; f
< pkt
->frames
; f
++) {
1001 bvec
[f
].bv_page
= pkt
->pages
[(f
* CD_FRAMESIZE
) / PAGE_SIZE
];
1002 bvec
[f
].bv_offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1006 * Fill-in bvec with data from orig_bios.
1009 spin_lock(&pkt
->lock
);
1010 for (bio
= pkt
->orig_bios
; bio
; bio
= bio
->bi_next
) {
1011 int segment
= bio
->bi_idx
;
1013 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1014 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1015 BUG_ON(first_frame
< 0);
1016 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1017 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++) {
1018 struct bio_vec
*src_bvl
= bio_iovec_idx(bio
, segment
);
1020 while (src_offs
>= src_bvl
->bv_len
) {
1021 src_offs
-= src_bvl
->bv_len
;
1023 BUG_ON(segment
>= bio
->bi_vcnt
);
1024 src_bvl
= bio_iovec_idx(bio
, segment
);
1027 if (src_bvl
->bv_len
- src_offs
>= CD_FRAMESIZE
) {
1028 bvec
[f
].bv_page
= src_bvl
->bv_page
;
1029 bvec
[f
].bv_offset
= src_bvl
->bv_offset
+ src_offs
;
1031 pkt_copy_bio_data(bio
, segment
, src_offs
,
1032 bvec
[f
].bv_page
, bvec
[f
].bv_offset
);
1034 src_offs
+= CD_FRAMESIZE
;
1038 pkt_set_state(pkt
, PACKET_WRITE_WAIT_STATE
);
1039 spin_unlock(&pkt
->lock
);
1041 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1042 frames_write
, (unsigned long long)pkt
->sector
);
1043 BUG_ON(frames_write
!= pkt
->write_size
);
1045 if (test_bit(PACKET_MERGE_SEGS
, &pd
->flags
) || (pkt
->write_size
< pkt
->frames
)) {
1046 pkt_make_local_copy(pkt
, bvec
);
1047 pkt
->cache_valid
= 1;
1049 pkt
->cache_valid
= 0;
1052 /* Start the write request */
1053 bio_init(pkt
->w_bio
);
1054 pkt
->w_bio
->bi_max_vecs
= PACKET_MAX_SIZE
;
1055 pkt
->w_bio
->bi_sector
= pkt
->sector
;
1056 pkt
->w_bio
->bi_bdev
= pd
->bdev
;
1057 pkt
->w_bio
->bi_end_io
= pkt_end_io_packet_write
;
1058 pkt
->w_bio
->bi_private
= pkt
;
1059 for (f
= 0; f
< pkt
->frames
; f
++)
1060 if (!bio_add_page(pkt
->w_bio
, bvec
[f
].bv_page
, CD_FRAMESIZE
, bvec
[f
].bv_offset
))
1062 VPRINTK("pktcdvd: vcnt=%d\n", pkt
->w_bio
->bi_vcnt
);
1064 atomic_set(&pkt
->io_wait
, 1);
1065 pkt
->w_bio
->bi_rw
= WRITE
;
1066 pkt_queue_bio(pd
, pkt
->w_bio
);
1069 static void pkt_finish_packet(struct packet_data
*pkt
, int uptodate
)
1071 struct bio
*bio
, *next
;
1074 pkt
->cache_valid
= 0;
1076 /* Finish all bios corresponding to this packet */
1077 bio
= pkt
->orig_bios
;
1079 next
= bio
->bi_next
;
1080 bio
->bi_next
= NULL
;
1081 bio_endio(bio
, bio
->bi_size
, uptodate
? 0 : -EIO
);
1084 pkt
->orig_bios
= pkt
->orig_bios_tail
= NULL
;
1087 static void pkt_run_state_machine(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1091 VPRINTK("run_state_machine: pkt %d\n", pkt
->id
);
1094 switch (pkt
->state
) {
1095 case PACKET_WAITING_STATE
:
1096 if ((pkt
->write_size
< pkt
->frames
) && (pkt
->sleep_time
> 0))
1099 pkt
->sleep_time
= 0;
1100 pkt_gather_data(pd
, pkt
);
1101 pkt_set_state(pkt
, PACKET_READ_WAIT_STATE
);
1104 case PACKET_READ_WAIT_STATE
:
1105 if (atomic_read(&pkt
->io_wait
) > 0)
1108 if (atomic_read(&pkt
->io_errors
) > 0) {
1109 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1111 pkt_start_write(pd
, pkt
);
1115 case PACKET_WRITE_WAIT_STATE
:
1116 if (atomic_read(&pkt
->io_wait
) > 0)
1119 if (test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
)) {
1120 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1122 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1126 case PACKET_RECOVERY_STATE
:
1127 if (pkt_start_recovery(pkt
)) {
1128 pkt_start_write(pd
, pkt
);
1130 VPRINTK("No recovery possible\n");
1131 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1135 case PACKET_FINISHED_STATE
:
1136 uptodate
= test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
);
1137 pkt_finish_packet(pkt
, uptodate
);
1147 static void pkt_handle_packets(struct pktcdvd_device
*pd
)
1149 struct packet_data
*pkt
, *next
;
1151 VPRINTK("pkt_handle_packets\n");
1154 * Run state machine for active packets
1156 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1157 if (atomic_read(&pkt
->run_sm
) > 0) {
1158 atomic_set(&pkt
->run_sm
, 0);
1159 pkt_run_state_machine(pd
, pkt
);
1164 * Move no longer active packets to the free list
1166 spin_lock(&pd
->cdrw
.active_list_lock
);
1167 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_active_list
, list
) {
1168 if (pkt
->state
== PACKET_FINISHED_STATE
) {
1169 list_del(&pkt
->list
);
1170 pkt_put_packet_data(pd
, pkt
);
1171 pkt_set_state(pkt
, PACKET_IDLE_STATE
);
1172 atomic_set(&pd
->scan_queue
, 1);
1175 spin_unlock(&pd
->cdrw
.active_list_lock
);
1178 static void pkt_count_states(struct pktcdvd_device
*pd
, int *states
)
1180 struct packet_data
*pkt
;
1183 for (i
= 0; i
< PACKET_NUM_STATES
; i
++)
1186 spin_lock(&pd
->cdrw
.active_list_lock
);
1187 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1188 states
[pkt
->state
]++;
1190 spin_unlock(&pd
->cdrw
.active_list_lock
);
1194 * kcdrwd is woken up when writes have been queued for one of our
1195 * registered devices
1197 static int kcdrwd(void *foobar
)
1199 struct pktcdvd_device
*pd
= foobar
;
1200 struct packet_data
*pkt
;
1201 long min_sleep_time
, residue
;
1203 set_user_nice(current
, -20);
1206 DECLARE_WAITQUEUE(wait
, current
);
1209 * Wait until there is something to do
1211 add_wait_queue(&pd
->wqueue
, &wait
);
1213 set_current_state(TASK_INTERRUPTIBLE
);
1215 /* Check if we need to run pkt_handle_queue */
1216 if (atomic_read(&pd
->scan_queue
) > 0)
1219 /* Check if we need to run the state machine for some packet */
1220 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1221 if (atomic_read(&pkt
->run_sm
) > 0)
1225 /* Check if we need to process the iosched queues */
1226 if (atomic_read(&pd
->iosched
.attention
) != 0)
1229 /* Otherwise, go to sleep */
1230 if (PACKET_DEBUG
> 1) {
1231 int states
[PACKET_NUM_STATES
];
1232 pkt_count_states(pd
, states
);
1233 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1234 states
[0], states
[1], states
[2], states
[3],
1235 states
[4], states
[5]);
1238 min_sleep_time
= MAX_SCHEDULE_TIMEOUT
;
1239 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1240 if (pkt
->sleep_time
&& pkt
->sleep_time
< min_sleep_time
)
1241 min_sleep_time
= pkt
->sleep_time
;
1244 generic_unplug_device(bdev_get_queue(pd
->bdev
));
1246 VPRINTK("kcdrwd: sleeping\n");
1247 residue
= schedule_timeout(min_sleep_time
);
1248 VPRINTK("kcdrwd: wake up\n");
1250 /* make swsusp happy with our thread */
1253 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1254 if (!pkt
->sleep_time
)
1256 pkt
->sleep_time
-= min_sleep_time
- residue
;
1257 if (pkt
->sleep_time
<= 0) {
1258 pkt
->sleep_time
= 0;
1259 atomic_inc(&pkt
->run_sm
);
1263 if (signal_pending(current
)) {
1264 flush_signals(current
);
1266 if (kthread_should_stop())
1270 set_current_state(TASK_RUNNING
);
1271 remove_wait_queue(&pd
->wqueue
, &wait
);
1273 if (kthread_should_stop())
1277 * if pkt_handle_queue returns true, we can queue
1280 while (pkt_handle_queue(pd
))
1284 * Handle packet state machine
1286 pkt_handle_packets(pd
);
1289 * Handle iosched queues
1291 pkt_iosched_process_queue(pd
);
1297 static void pkt_print_settings(struct pktcdvd_device
*pd
)
1299 printk("pktcdvd: %s packets, ", pd
->settings
.fp
? "Fixed" : "Variable");
1300 printk("%u blocks, ", pd
->settings
.size
>> 2);
1301 printk("Mode-%c disc\n", pd
->settings
.block_mode
== 8 ? '1' : '2');
1304 static int pkt_mode_sense(struct pktcdvd_device
*pd
, struct packet_command
*cgc
, int page_code
, int page_control
)
1306 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1308 cgc
->cmd
[0] = GPCMD_MODE_SENSE_10
;
1309 cgc
->cmd
[2] = page_code
| (page_control
<< 6);
1310 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1311 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1312 cgc
->data_direction
= CGC_DATA_READ
;
1313 return pkt_generic_packet(pd
, cgc
);
1316 static int pkt_mode_select(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
1318 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1319 memset(cgc
->buffer
, 0, 2);
1320 cgc
->cmd
[0] = GPCMD_MODE_SELECT_10
;
1321 cgc
->cmd
[1] = 0x10; /* PF */
1322 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1323 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1324 cgc
->data_direction
= CGC_DATA_WRITE
;
1325 return pkt_generic_packet(pd
, cgc
);
1328 static int pkt_get_disc_info(struct pktcdvd_device
*pd
, disc_information
*di
)
1330 struct packet_command cgc
;
1333 /* set up command and get the disc info */
1334 init_cdrom_command(&cgc
, di
, sizeof(*di
), CGC_DATA_READ
);
1335 cgc
.cmd
[0] = GPCMD_READ_DISC_INFO
;
1336 cgc
.cmd
[8] = cgc
.buflen
= 2;
1339 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1342 /* not all drives have the same disc_info length, so requeue
1343 * packet with the length the drive tells us it can supply
1345 cgc
.buflen
= be16_to_cpu(di
->disc_information_length
) +
1346 sizeof(di
->disc_information_length
);
1348 if (cgc
.buflen
> sizeof(disc_information
))
1349 cgc
.buflen
= sizeof(disc_information
);
1351 cgc
.cmd
[8] = cgc
.buflen
;
1352 return pkt_generic_packet(pd
, &cgc
);
1355 static int pkt_get_track_info(struct pktcdvd_device
*pd
, __u16 track
, __u8 type
, track_information
*ti
)
1357 struct packet_command cgc
;
1360 init_cdrom_command(&cgc
, ti
, 8, CGC_DATA_READ
);
1361 cgc
.cmd
[0] = GPCMD_READ_TRACK_RZONE_INFO
;
1362 cgc
.cmd
[1] = type
& 3;
1363 cgc
.cmd
[4] = (track
& 0xff00) >> 8;
1364 cgc
.cmd
[5] = track
& 0xff;
1368 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1371 cgc
.buflen
= be16_to_cpu(ti
->track_information_length
) +
1372 sizeof(ti
->track_information_length
);
1374 if (cgc
.buflen
> sizeof(track_information
))
1375 cgc
.buflen
= sizeof(track_information
);
1377 cgc
.cmd
[8] = cgc
.buflen
;
1378 return pkt_generic_packet(pd
, &cgc
);
1381 static int pkt_get_last_written(struct pktcdvd_device
*pd
, long *last_written
)
1383 disc_information di
;
1384 track_information ti
;
1388 if ((ret
= pkt_get_disc_info(pd
, &di
)))
1391 last_track
= (di
.last_track_msb
<< 8) | di
.last_track_lsb
;
1392 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1395 /* if this track is blank, try the previous. */
1398 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1402 /* if last recorded field is valid, return it. */
1404 *last_written
= be32_to_cpu(ti
.last_rec_address
);
1406 /* make it up instead */
1407 *last_written
= be32_to_cpu(ti
.track_start
) +
1408 be32_to_cpu(ti
.track_size
);
1410 *last_written
-= (be32_to_cpu(ti
.free_blocks
) + 7);
1416 * write mode select package based on pd->settings
1418 static int pkt_set_write_settings(struct pktcdvd_device
*pd
)
1420 struct packet_command cgc
;
1421 struct request_sense sense
;
1422 write_param_page
*wp
;
1426 /* doesn't apply to DVD+RW or DVD-RAM */
1427 if ((pd
->mmc3_profile
== 0x1a) || (pd
->mmc3_profile
== 0x12))
1430 memset(buffer
, 0, sizeof(buffer
));
1431 init_cdrom_command(&cgc
, buffer
, sizeof(*wp
), CGC_DATA_READ
);
1433 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1434 pkt_dump_sense(&cgc
);
1438 size
= 2 + ((buffer
[0] << 8) | (buffer
[1] & 0xff));
1439 pd
->mode_offset
= (buffer
[6] << 8) | (buffer
[7] & 0xff);
1440 if (size
> sizeof(buffer
))
1441 size
= sizeof(buffer
);
1446 init_cdrom_command(&cgc
, buffer
, size
, CGC_DATA_READ
);
1448 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1449 pkt_dump_sense(&cgc
);
1454 * write page is offset header + block descriptor length
1456 wp
= (write_param_page
*) &buffer
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
1458 wp
->fp
= pd
->settings
.fp
;
1459 wp
->track_mode
= pd
->settings
.track_mode
;
1460 wp
->write_type
= pd
->settings
.write_type
;
1461 wp
->data_block_type
= pd
->settings
.block_mode
;
1463 wp
->multi_session
= 0;
1465 #ifdef PACKET_USE_LS
1470 if (wp
->data_block_type
== PACKET_BLOCK_MODE1
) {
1471 wp
->session_format
= 0;
1473 } else if (wp
->data_block_type
== PACKET_BLOCK_MODE2
) {
1474 wp
->session_format
= 0x20;
1478 memcpy(&wp
->mcn
[1], PACKET_MCN
, sizeof(wp
->mcn
) - 1);
1484 printk("pktcdvd: write mode wrong %d\n", wp
->data_block_type
);
1487 wp
->packet_size
= cpu_to_be32(pd
->settings
.size
>> 2);
1489 cgc
.buflen
= cgc
.cmd
[8] = size
;
1490 if ((ret
= pkt_mode_select(pd
, &cgc
))) {
1491 pkt_dump_sense(&cgc
);
1495 pkt_print_settings(pd
);
1500 * 1 -- we can write to this track, 0 -- we can't
1502 static int pkt_writable_track(track_information
*ti
)
1505 * only good for CD-RW at the moment, not DVD-RW
1509 * FIXME: only for FP
1515 * "good" settings as per Mt Fuji.
1517 if (ti
->rt
== 0 && ti
->blank
== 0 && ti
->packet
== 1)
1520 if (ti
->rt
== 0 && ti
->blank
== 1 && ti
->packet
== 1)
1523 if (ti
->rt
== 1 && ti
->blank
== 0 && ti
->packet
== 1)
1526 printk("pktcdvd: bad state %d-%d-%d\n", ti
->rt
, ti
->blank
, ti
->packet
);
1531 * 1 -- we can write to this disc, 0 -- we can't
1533 static int pkt_writable_disc(struct pktcdvd_device
*pd
, disc_information
*di
)
1535 switch (pd
->mmc3_profile
) {
1536 case 0x0a: /* CD-RW */
1537 case 0xffff: /* MMC3 not supported */
1539 case 0x1a: /* DVD+RW */
1540 case 0x13: /* DVD-RW */
1541 case 0x12: /* DVD-RAM */
1544 VPRINTK("pktcdvd: Wrong disc profile (%x)\n", pd
->mmc3_profile
);
1549 * for disc type 0xff we should probably reserve a new track.
1550 * but i'm not sure, should we leave this to user apps? probably.
1552 if (di
->disc_type
== 0xff) {
1553 printk("pktcdvd: Unknown disc. No track?\n");
1557 if (di
->disc_type
!= 0x20 && di
->disc_type
!= 0) {
1558 printk("pktcdvd: Wrong disc type (%x)\n", di
->disc_type
);
1562 if (di
->erasable
== 0) {
1563 printk("pktcdvd: Disc not erasable\n");
1567 if (di
->border_status
== PACKET_SESSION_RESERVED
) {
1568 printk("pktcdvd: Can't write to last track (reserved)\n");
1575 static int pkt_probe_settings(struct pktcdvd_device
*pd
)
1577 struct packet_command cgc
;
1578 unsigned char buf
[12];
1579 disc_information di
;
1580 track_information ti
;
1583 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1584 cgc
.cmd
[0] = GPCMD_GET_CONFIGURATION
;
1586 ret
= pkt_generic_packet(pd
, &cgc
);
1587 pd
->mmc3_profile
= ret
? 0xffff : buf
[6] << 8 | buf
[7];
1589 memset(&di
, 0, sizeof(disc_information
));
1590 memset(&ti
, 0, sizeof(track_information
));
1592 if ((ret
= pkt_get_disc_info(pd
, &di
))) {
1593 printk("failed get_disc\n");
1597 if (!pkt_writable_disc(pd
, &di
))
1600 switch (pd
->mmc3_profile
) {
1601 case 0x1a: /* DVD+RW */
1602 printk("pktcdvd: inserted media is DVD+RW\n");
1604 case 0x13: /* DVD-RW */
1605 printk("pktcdvd: inserted media is DVD-RW\n");
1607 case 0x12: /* DVD-RAM */
1608 printk("pktcdvd: inserted media is DVD-RAM\n");
1611 printk("pktcdvd: inserted media is CD-R%s\n", di
.erasable
? "W" : "");
1614 pd
->type
= di
.erasable
? PACKET_CDRW
: PACKET_CDR
;
1616 track
= 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1617 if ((ret
= pkt_get_track_info(pd
, track
, 1, &ti
))) {
1618 printk("pktcdvd: failed get_track\n");
1622 if (!pkt_writable_track(&ti
)) {
1623 printk("pktcdvd: can't write to this track\n");
1628 * we keep packet size in 512 byte units, makes it easier to
1629 * deal with request calculations.
1631 pd
->settings
.size
= be32_to_cpu(ti
.fixed_packet_size
) << 2;
1632 if (pd
->settings
.size
== 0) {
1633 printk("pktcdvd: detected zero packet size!\n");
1636 if (pd
->settings
.size
> PACKET_MAX_SECTORS
) {
1637 printk("pktcdvd: packet size is too big\n");
1640 pd
->settings
.fp
= ti
.fp
;
1641 pd
->offset
= (be32_to_cpu(ti
.track_start
) << 2) & (pd
->settings
.size
- 1);
1644 pd
->nwa
= be32_to_cpu(ti
.next_writable
);
1645 set_bit(PACKET_NWA_VALID
, &pd
->flags
);
1649 * in theory we could use lra on -RW media as well and just zero
1650 * blocks that haven't been written yet, but in practice that
1651 * is just a no-go. we'll use that for -R, naturally.
1654 pd
->lra
= be32_to_cpu(ti
.last_rec_address
);
1655 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
1657 pd
->lra
= 0xffffffff;
1658 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
1664 pd
->settings
.link_loss
= 7;
1665 pd
->settings
.write_type
= 0; /* packet */
1666 pd
->settings
.track_mode
= ti
.track_mode
;
1669 * mode1 or mode2 disc
1671 switch (ti
.data_mode
) {
1673 pd
->settings
.block_mode
= PACKET_BLOCK_MODE1
;
1676 pd
->settings
.block_mode
= PACKET_BLOCK_MODE2
;
1679 printk("pktcdvd: unknown data mode\n");
1686 * enable/disable write caching on drive
1688 static int pkt_write_caching(struct pktcdvd_device
*pd
, int set
)
1690 struct packet_command cgc
;
1691 struct request_sense sense
;
1692 unsigned char buf
[64];
1695 memset(buf
, 0, sizeof(buf
));
1696 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1698 cgc
.buflen
= pd
->mode_offset
+ 12;
1701 * caching mode page might not be there, so quiet this command
1705 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WCACHING_PAGE
, 0)))
1708 buf
[pd
->mode_offset
+ 10] |= (!!set
<< 2);
1710 cgc
.buflen
= cgc
.cmd
[8] = 2 + ((buf
[0] << 8) | (buf
[1] & 0xff));
1711 ret
= pkt_mode_select(pd
, &cgc
);
1713 printk("pktcdvd: write caching control failed\n");
1714 pkt_dump_sense(&cgc
);
1715 } else if (!ret
&& set
)
1716 printk("pktcdvd: enabled write caching on %s\n", pd
->name
);
1720 static int pkt_lock_door(struct pktcdvd_device
*pd
, int lockflag
)
1722 struct packet_command cgc
;
1724 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
1725 cgc
.cmd
[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL
;
1726 cgc
.cmd
[4] = lockflag
? 1 : 0;
1727 return pkt_generic_packet(pd
, &cgc
);
1731 * Returns drive maximum write speed
1733 static int pkt_get_max_speed(struct pktcdvd_device
*pd
, unsigned *write_speed
)
1735 struct packet_command cgc
;
1736 struct request_sense sense
;
1737 unsigned char buf
[256+18];
1738 unsigned char *cap_buf
;
1741 memset(buf
, 0, sizeof(buf
));
1742 cap_buf
= &buf
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
1743 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_UNKNOWN
);
1746 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
1748 cgc
.buflen
= pd
->mode_offset
+ cap_buf
[1] + 2 +
1749 sizeof(struct mode_page_header
);
1750 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
1752 pkt_dump_sense(&cgc
);
1757 offset
= 20; /* Obsoleted field, used by older drives */
1758 if (cap_buf
[1] >= 28)
1759 offset
= 28; /* Current write speed selected */
1760 if (cap_buf
[1] >= 30) {
1761 /* If the drive reports at least one "Logical Unit Write
1762 * Speed Performance Descriptor Block", use the information
1763 * in the first block. (contains the highest speed)
1765 int num_spdb
= (cap_buf
[30] << 8) + cap_buf
[31];
1770 *write_speed
= (cap_buf
[offset
] << 8) | cap_buf
[offset
+ 1];
1774 /* These tables from cdrecord - I don't have orange book */
1775 /* standard speed CD-RW (1-4x) */
1776 static char clv_to_speed
[16] = {
1777 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1778 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1780 /* high speed CD-RW (-10x) */
1781 static char hs_clv_to_speed
[16] = {
1782 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1783 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1785 /* ultra high speed CD-RW */
1786 static char us_clv_to_speed
[16] = {
1787 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
1788 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
1792 * reads the maximum media speed from ATIP
1794 static int pkt_media_speed(struct pktcdvd_device
*pd
, unsigned *speed
)
1796 struct packet_command cgc
;
1797 struct request_sense sense
;
1798 unsigned char buf
[64];
1799 unsigned int size
, st
, sp
;
1802 init_cdrom_command(&cgc
, buf
, 2, CGC_DATA_READ
);
1804 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
1806 cgc
.cmd
[2] = 4; /* READ ATIP */
1808 ret
= pkt_generic_packet(pd
, &cgc
);
1810 pkt_dump_sense(&cgc
);
1813 size
= ((unsigned int) buf
[0]<<8) + buf
[1] + 2;
1814 if (size
> sizeof(buf
))
1817 init_cdrom_command(&cgc
, buf
, size
, CGC_DATA_READ
);
1819 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
1823 ret
= pkt_generic_packet(pd
, &cgc
);
1825 pkt_dump_sense(&cgc
);
1829 if (!buf
[6] & 0x40) {
1830 printk("pktcdvd: Disc type is not CD-RW\n");
1833 if (!buf
[6] & 0x4) {
1834 printk("pktcdvd: A1 values on media are not valid, maybe not CDRW?\n");
1838 st
= (buf
[6] >> 3) & 0x7; /* disc sub-type */
1840 sp
= buf
[16] & 0xf; /* max speed from ATIP A1 field */
1842 /* Info from cdrecord */
1844 case 0: /* standard speed */
1845 *speed
= clv_to_speed
[sp
];
1847 case 1: /* high speed */
1848 *speed
= hs_clv_to_speed
[sp
];
1850 case 2: /* ultra high speed */
1851 *speed
= us_clv_to_speed
[sp
];
1854 printk("pktcdvd: Unknown disc sub-type %d\n",st
);
1858 printk("pktcdvd: Max. media speed: %d\n",*speed
);
1861 printk("pktcdvd: Unknown speed %d for sub-type %d\n",sp
,st
);
1866 static int pkt_perform_opc(struct pktcdvd_device
*pd
)
1868 struct packet_command cgc
;
1869 struct request_sense sense
;
1872 VPRINTK("pktcdvd: Performing OPC\n");
1874 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
1876 cgc
.timeout
= 60*HZ
;
1877 cgc
.cmd
[0] = GPCMD_SEND_OPC
;
1879 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1880 pkt_dump_sense(&cgc
);
1884 static int pkt_open_write(struct pktcdvd_device
*pd
)
1887 unsigned int write_speed
, media_write_speed
, read_speed
;
1889 if ((ret
= pkt_probe_settings(pd
))) {
1890 VPRINTK("pktcdvd: %s failed probe\n", pd
->name
);
1894 if ((ret
= pkt_set_write_settings(pd
))) {
1895 DPRINTK("pktcdvd: %s failed saving write settings\n", pd
->name
);
1899 pkt_write_caching(pd
, USE_WCACHING
);
1901 if ((ret
= pkt_get_max_speed(pd
, &write_speed
)))
1902 write_speed
= 16 * 177;
1903 switch (pd
->mmc3_profile
) {
1904 case 0x13: /* DVD-RW */
1905 case 0x1a: /* DVD+RW */
1906 case 0x12: /* DVD-RAM */
1907 DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed
);
1910 if ((ret
= pkt_media_speed(pd
, &media_write_speed
)))
1911 media_write_speed
= 16;
1912 write_speed
= min(write_speed
, media_write_speed
* 177);
1913 DPRINTK("pktcdvd: write speed %ux\n", write_speed
/ 176);
1916 read_speed
= write_speed
;
1918 if ((ret
= pkt_set_speed(pd
, write_speed
, read_speed
))) {
1919 DPRINTK("pktcdvd: %s couldn't set write speed\n", pd
->name
);
1922 pd
->write_speed
= write_speed
;
1923 pd
->read_speed
= read_speed
;
1925 if ((ret
= pkt_perform_opc(pd
))) {
1926 DPRINTK("pktcdvd: %s Optimum Power Calibration failed\n", pd
->name
);
1933 * called at open time.
1935 static int pkt_open_dev(struct pktcdvd_device
*pd
, int write
)
1942 * We need to re-open the cdrom device without O_NONBLOCK to be able
1943 * to read/write from/to it. It is already opened in O_NONBLOCK mode
1944 * so bdget() can't fail.
1946 bdget(pd
->bdev
->bd_dev
);
1947 if ((ret
= blkdev_get(pd
->bdev
, FMODE_READ
, O_RDONLY
)))
1950 if ((ret
= bd_claim(pd
->bdev
, pd
)))
1953 if ((ret
= pkt_get_last_written(pd
, &lba
))) {
1954 printk("pktcdvd: pkt_get_last_written failed\n");
1958 set_capacity(pd
->disk
, lba
<< 2);
1959 set_capacity(pd
->bdev
->bd_disk
, lba
<< 2);
1960 bd_set_size(pd
->bdev
, (loff_t
)lba
<< 11);
1962 q
= bdev_get_queue(pd
->bdev
);
1964 if ((ret
= pkt_open_write(pd
)))
1967 * Some CDRW drives can not handle writes larger than one packet,
1968 * even if the size is a multiple of the packet size.
1970 spin_lock_irq(q
->queue_lock
);
1971 blk_queue_max_sectors(q
, pd
->settings
.size
);
1972 spin_unlock_irq(q
->queue_lock
);
1973 set_bit(PACKET_WRITABLE
, &pd
->flags
);
1975 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
1976 clear_bit(PACKET_WRITABLE
, &pd
->flags
);
1979 if ((ret
= pkt_set_segment_merging(pd
, q
)))
1983 if (!pkt_grow_pktlist(pd
, CONFIG_CDROM_PKTCDVD_BUFFERS
)) {
1984 printk("pktcdvd: not enough memory for buffers\n");
1988 printk("pktcdvd: %lukB available on disc\n", lba
<< 1);
1994 bd_release(pd
->bdev
);
1996 blkdev_put(pd
->bdev
);
2002 * called when the device is closed. makes sure that the device flushes
2003 * the internal cache before we close.
2005 static void pkt_release_dev(struct pktcdvd_device
*pd
, int flush
)
2007 if (flush
&& pkt_flush_cache(pd
))
2008 DPRINTK("pktcdvd: %s not flushing cache\n", pd
->name
);
2010 pkt_lock_door(pd
, 0);
2012 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2013 bd_release(pd
->bdev
);
2014 blkdev_put(pd
->bdev
);
2016 pkt_shrink_pktlist(pd
);
2019 static struct pktcdvd_device
*pkt_find_dev_from_minor(int dev_minor
)
2021 if (dev_minor
>= MAX_WRITERS
)
2023 return pkt_devs
[dev_minor
];
2026 static int pkt_open(struct inode
*inode
, struct file
*file
)
2028 struct pktcdvd_device
*pd
= NULL
;
2031 VPRINTK("pktcdvd: entering open\n");
2034 pd
= pkt_find_dev_from_minor(iminor(inode
));
2039 BUG_ON(pd
->refcnt
< 0);
2042 if (pd
->refcnt
> 1) {
2043 if ((file
->f_mode
& FMODE_WRITE
) &&
2044 !test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2049 ret
= pkt_open_dev(pd
, file
->f_mode
& FMODE_WRITE
);
2053 * needed here as well, since ext2 (among others) may change
2054 * the blocksize at mount time
2056 set_blocksize(inode
->i_bdev
, CD_FRAMESIZE
);
2065 VPRINTK("pktcdvd: failed open (%d)\n", ret
);
2070 static int pkt_close(struct inode
*inode
, struct file
*file
)
2072 struct pktcdvd_device
*pd
= inode
->i_bdev
->bd_disk
->private_data
;
2077 BUG_ON(pd
->refcnt
< 0);
2078 if (pd
->refcnt
== 0) {
2079 int flush
= test_bit(PACKET_WRITABLE
, &pd
->flags
);
2080 pkt_release_dev(pd
, flush
);
2087 static void *psd_pool_alloc(gfp_t gfp_mask
, void *data
)
2089 return kmalloc(sizeof(struct packet_stacked_data
), gfp_mask
);
2092 static void psd_pool_free(void *ptr
, void *data
)
2097 static int pkt_end_io_read_cloned(struct bio
*bio
, unsigned int bytes_done
, int err
)
2099 struct packet_stacked_data
*psd
= bio
->bi_private
;
2100 struct pktcdvd_device
*pd
= psd
->pd
;
2106 bio_endio(psd
->bio
, psd
->bio
->bi_size
, err
);
2107 mempool_free(psd
, psd_pool
);
2108 pkt_bio_finished(pd
);
2112 static int pkt_make_request(request_queue_t
*q
, struct bio
*bio
)
2114 struct pktcdvd_device
*pd
;
2115 char b
[BDEVNAME_SIZE
];
2117 struct packet_data
*pkt
;
2118 int was_empty
, blocked_bio
;
2119 struct pkt_rb_node
*node
;
2123 printk("pktcdvd: %s incorrect request queue\n", bdevname(bio
->bi_bdev
, b
));
2128 * Clone READ bios so we can have our own bi_end_io callback.
2130 if (bio_data_dir(bio
) == READ
) {
2131 struct bio
*cloned_bio
= bio_clone(bio
, GFP_NOIO
);
2132 struct packet_stacked_data
*psd
= mempool_alloc(psd_pool
, GFP_NOIO
);
2136 cloned_bio
->bi_bdev
= pd
->bdev
;
2137 cloned_bio
->bi_private
= psd
;
2138 cloned_bio
->bi_end_io
= pkt_end_io_read_cloned
;
2139 pd
->stats
.secs_r
+= bio
->bi_size
>> 9;
2140 pkt_queue_bio(pd
, cloned_bio
);
2144 if (!test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2145 printk("pktcdvd: WRITE for ro device %s (%llu)\n",
2146 pd
->name
, (unsigned long long)bio
->bi_sector
);
2150 if (!bio
->bi_size
|| (bio
->bi_size
% CD_FRAMESIZE
)) {
2151 printk("pktcdvd: wrong bio size\n");
2155 blk_queue_bounce(q
, &bio
);
2157 zone
= ZONE(bio
->bi_sector
, pd
);
2158 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2159 (unsigned long long)bio
->bi_sector
,
2160 (unsigned long long)(bio
->bi_sector
+ bio_sectors(bio
)));
2162 /* Check if we have to split the bio */
2164 struct bio_pair
*bp
;
2168 last_zone
= ZONE(bio
->bi_sector
+ bio_sectors(bio
) - 1, pd
);
2169 if (last_zone
!= zone
) {
2170 BUG_ON(last_zone
!= zone
+ pd
->settings
.size
);
2171 first_sectors
= last_zone
- bio
->bi_sector
;
2172 bp
= bio_split(bio
, bio_split_pool
, first_sectors
);
2174 pkt_make_request(q
, &bp
->bio1
);
2175 pkt_make_request(q
, &bp
->bio2
);
2176 bio_pair_release(bp
);
2182 * If we find a matching packet in state WAITING or READ_WAIT, we can
2183 * just append this bio to that packet.
2185 spin_lock(&pd
->cdrw
.active_list_lock
);
2187 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
2188 if (pkt
->sector
== zone
) {
2189 spin_lock(&pkt
->lock
);
2190 if ((pkt
->state
== PACKET_WAITING_STATE
) ||
2191 (pkt
->state
== PACKET_READ_WAIT_STATE
)) {
2192 pkt_add_list_last(bio
, &pkt
->orig_bios
,
2193 &pkt
->orig_bios_tail
);
2194 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
2195 if ((pkt
->write_size
>= pkt
->frames
) &&
2196 (pkt
->state
== PACKET_WAITING_STATE
)) {
2197 atomic_inc(&pkt
->run_sm
);
2198 wake_up(&pd
->wqueue
);
2200 spin_unlock(&pkt
->lock
);
2201 spin_unlock(&pd
->cdrw
.active_list_lock
);
2206 spin_unlock(&pkt
->lock
);
2209 spin_unlock(&pd
->cdrw
.active_list_lock
);
2212 * No matching packet found. Store the bio in the work queue.
2214 node
= mempool_alloc(pd
->rb_pool
, GFP_NOIO
);
2216 spin_lock(&pd
->lock
);
2217 BUG_ON(pd
->bio_queue_size
< 0);
2218 was_empty
= (pd
->bio_queue_size
== 0);
2219 pkt_rbtree_insert(pd
, node
);
2220 spin_unlock(&pd
->lock
);
2223 * Wake up the worker thread.
2225 atomic_set(&pd
->scan_queue
, 1);
2227 /* This wake_up is required for correct operation */
2228 wake_up(&pd
->wqueue
);
2229 } else if (!list_empty(&pd
->cdrw
.pkt_free_list
) && !blocked_bio
) {
2231 * This wake up is not required for correct operation,
2232 * but improves performance in some cases.
2234 wake_up(&pd
->wqueue
);
2238 bio_io_error(bio
, bio
->bi_size
);
2244 static int pkt_merge_bvec(request_queue_t
*q
, struct bio
*bio
, struct bio_vec
*bvec
)
2246 struct pktcdvd_device
*pd
= q
->queuedata
;
2247 sector_t zone
= ZONE(bio
->bi_sector
, pd
);
2248 int used
= ((bio
->bi_sector
- zone
) << 9) + bio
->bi_size
;
2249 int remaining
= (pd
->settings
.size
<< 9) - used
;
2253 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2254 * boundary, pkt_make_request() will split the bio.
2256 remaining2
= PAGE_SIZE
- bio
->bi_size
;
2257 remaining
= max(remaining
, remaining2
);
2259 BUG_ON(remaining
< 0);
2263 static void pkt_init_queue(struct pktcdvd_device
*pd
)
2265 request_queue_t
*q
= pd
->disk
->queue
;
2267 blk_queue_make_request(q
, pkt_make_request
);
2268 blk_queue_hardsect_size(q
, CD_FRAMESIZE
);
2269 blk_queue_max_sectors(q
, PACKET_MAX_SECTORS
);
2270 blk_queue_merge_bvec(q
, pkt_merge_bvec
);
2274 static int pkt_seq_show(struct seq_file
*m
, void *p
)
2276 struct pktcdvd_device
*pd
= m
->private;
2278 char bdev_buf
[BDEVNAME_SIZE
];
2279 int states
[PACKET_NUM_STATES
];
2281 seq_printf(m
, "Writer %s mapped to %s:\n", pd
->name
,
2282 bdevname(pd
->bdev
, bdev_buf
));
2284 seq_printf(m
, "\nSettings:\n");
2285 seq_printf(m
, "\tpacket size:\t\t%dkB\n", pd
->settings
.size
/ 2);
2287 if (pd
->settings
.write_type
== 0)
2291 seq_printf(m
, "\twrite type:\t\t%s\n", msg
);
2293 seq_printf(m
, "\tpacket type:\t\t%s\n", pd
->settings
.fp
? "Fixed" : "Variable");
2294 seq_printf(m
, "\tlink loss:\t\t%d\n", pd
->settings
.link_loss
);
2296 seq_printf(m
, "\ttrack mode:\t\t%d\n", pd
->settings
.track_mode
);
2298 if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE1
)
2300 else if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE2
)
2304 seq_printf(m
, "\tblock mode:\t\t%s\n", msg
);
2306 seq_printf(m
, "\nStatistics:\n");
2307 seq_printf(m
, "\tpackets started:\t%lu\n", pd
->stats
.pkt_started
);
2308 seq_printf(m
, "\tpackets ended:\t\t%lu\n", pd
->stats
.pkt_ended
);
2309 seq_printf(m
, "\twritten:\t\t%lukB\n", pd
->stats
.secs_w
>> 1);
2310 seq_printf(m
, "\tread gather:\t\t%lukB\n", pd
->stats
.secs_rg
>> 1);
2311 seq_printf(m
, "\tread:\t\t\t%lukB\n", pd
->stats
.secs_r
>> 1);
2313 seq_printf(m
, "\nMisc:\n");
2314 seq_printf(m
, "\treference count:\t%d\n", pd
->refcnt
);
2315 seq_printf(m
, "\tflags:\t\t\t0x%lx\n", pd
->flags
);
2316 seq_printf(m
, "\tread speed:\t\t%ukB/s\n", pd
->read_speed
);
2317 seq_printf(m
, "\twrite speed:\t\t%ukB/s\n", pd
->write_speed
);
2318 seq_printf(m
, "\tstart offset:\t\t%lu\n", pd
->offset
);
2319 seq_printf(m
, "\tmode page offset:\t%u\n", pd
->mode_offset
);
2321 seq_printf(m
, "\nQueue state:\n");
2322 seq_printf(m
, "\tbios queued:\t\t%d\n", pd
->bio_queue_size
);
2323 seq_printf(m
, "\tbios pending:\t\t%d\n", atomic_read(&pd
->cdrw
.pending_bios
));
2324 seq_printf(m
, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd
->current_sector
);
2326 pkt_count_states(pd
, states
);
2327 seq_printf(m
, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2328 states
[0], states
[1], states
[2], states
[3], states
[4], states
[5]);
2333 static int pkt_seq_open(struct inode
*inode
, struct file
*file
)
2335 return single_open(file
, pkt_seq_show
, PDE(inode
)->data
);
2338 static struct file_operations pkt_proc_fops
= {
2339 .open
= pkt_seq_open
,
2341 .llseek
= seq_lseek
,
2342 .release
= single_release
2345 static int pkt_new_dev(struct pktcdvd_device
*pd
, dev_t dev
)
2349 char b
[BDEVNAME_SIZE
];
2350 struct proc_dir_entry
*proc
;
2351 struct block_device
*bdev
;
2353 if (pd
->pkt_dev
== dev
) {
2354 printk("pktcdvd: Recursive setup not allowed\n");
2357 for (i
= 0; i
< MAX_WRITERS
; i
++) {
2358 struct pktcdvd_device
*pd2
= pkt_devs
[i
];
2361 if (pd2
->bdev
->bd_dev
== dev
) {
2362 printk("pktcdvd: %s already setup\n", bdevname(pd2
->bdev
, b
));
2365 if (pd2
->pkt_dev
== dev
) {
2366 printk("pktcdvd: Can't chain pktcdvd devices\n");
2374 ret
= blkdev_get(bdev
, FMODE_READ
, O_RDONLY
| O_NONBLOCK
);
2378 /* This is safe, since we have a reference from open(). */
2379 __module_get(THIS_MODULE
);
2382 set_blocksize(bdev
, CD_FRAMESIZE
);
2386 atomic_set(&pd
->cdrw
.pending_bios
, 0);
2387 pd
->cdrw
.thread
= kthread_run(kcdrwd
, pd
, "%s", pd
->name
);
2388 if (IS_ERR(pd
->cdrw
.thread
)) {
2389 printk("pktcdvd: can't start kernel thread\n");
2394 proc
= create_proc_entry(pd
->name
, 0, pkt_proc
);
2397 proc
->proc_fops
= &pkt_proc_fops
;
2399 DPRINTK("pktcdvd: writer %s mapped to %s\n", pd
->name
, bdevname(bdev
, b
));
2404 /* This is safe: open() is still holding a reference. */
2405 module_put(THIS_MODULE
);
2409 static int pkt_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
2411 struct pktcdvd_device
*pd
= inode
->i_bdev
->bd_disk
->private_data
;
2413 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd
, imajor(inode
), iminor(inode
));
2417 * forward selected CDROM ioctls to CD-ROM, for UDF
2419 case CDROMMULTISESSION
:
2420 case CDROMREADTOCENTRY
:
2421 case CDROM_LAST_WRITTEN
:
2422 case CDROM_SEND_PACKET
:
2423 case SCSI_IOCTL_SEND_COMMAND
:
2424 return blkdev_ioctl(pd
->bdev
->bd_inode
, file
, cmd
, arg
);
2428 * The door gets locked when the device is opened, so we
2429 * have to unlock it or else the eject command fails.
2431 if (pd
->refcnt
== 1)
2432 pkt_lock_door(pd
, 0);
2433 return blkdev_ioctl(pd
->bdev
->bd_inode
, file
, cmd
, arg
);
2436 VPRINTK("pktcdvd: Unknown ioctl for %s (%x)\n", pd
->name
, cmd
);
2443 static int pkt_media_changed(struct gendisk
*disk
)
2445 struct pktcdvd_device
*pd
= disk
->private_data
;
2446 struct gendisk
*attached_disk
;
2452 attached_disk
= pd
->bdev
->bd_disk
;
2455 return attached_disk
->fops
->media_changed(attached_disk
);
2458 static struct block_device_operations pktcdvd_ops
= {
2459 .owner
= THIS_MODULE
,
2461 .release
= pkt_close
,
2463 .media_changed
= pkt_media_changed
,
2467 * Set up mapping from pktcdvd device to CD-ROM device.
2469 static int pkt_setup_dev(struct pkt_ctrl_command
*ctrl_cmd
)
2473 struct pktcdvd_device
*pd
;
2474 struct gendisk
*disk
;
2475 dev_t dev
= new_decode_dev(ctrl_cmd
->dev
);
2477 for (idx
= 0; idx
< MAX_WRITERS
; idx
++)
2480 if (idx
== MAX_WRITERS
) {
2481 printk("pktcdvd: max %d writers supported\n", MAX_WRITERS
);
2485 pd
= kzalloc(sizeof(struct pktcdvd_device
), GFP_KERNEL
);
2489 pd
->rb_pool
= mempool_create(PKT_RB_POOL_SIZE
, pkt_rb_alloc
, pkt_rb_free
, NULL
);
2493 disk
= alloc_disk(1);
2498 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
2499 INIT_LIST_HEAD(&pd
->cdrw
.pkt_active_list
);
2500 spin_lock_init(&pd
->cdrw
.active_list_lock
);
2502 spin_lock_init(&pd
->lock
);
2503 spin_lock_init(&pd
->iosched
.lock
);
2504 sprintf(pd
->name
, "pktcdvd%d", idx
);
2505 init_waitqueue_head(&pd
->wqueue
);
2506 pd
->bio_queue
= RB_ROOT
;
2508 disk
->major
= pkt_major
;
2509 disk
->first_minor
= idx
;
2510 disk
->fops
= &pktcdvd_ops
;
2511 disk
->flags
= GENHD_FL_REMOVABLE
;
2512 sprintf(disk
->disk_name
, "pktcdvd%d", idx
);
2513 disk
->private_data
= pd
;
2514 disk
->queue
= blk_alloc_queue(GFP_KERNEL
);
2518 pd
->pkt_dev
= MKDEV(disk
->major
, disk
->first_minor
);
2519 ret
= pkt_new_dev(pd
, dev
);
2525 ctrl_cmd
->pkt_dev
= new_encode_dev(pd
->pkt_dev
);
2529 blk_put_queue(disk
->queue
);
2534 mempool_destroy(pd
->rb_pool
);
2540 * Tear down mapping from pktcdvd device to CD-ROM device.
2542 static int pkt_remove_dev(struct pkt_ctrl_command
*ctrl_cmd
)
2544 struct pktcdvd_device
*pd
;
2546 dev_t pkt_dev
= new_decode_dev(ctrl_cmd
->pkt_dev
);
2548 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
2550 if (pd
&& (pd
->pkt_dev
== pkt_dev
))
2553 if (idx
== MAX_WRITERS
) {
2554 DPRINTK("pktcdvd: dev not setup\n");
2561 if (!IS_ERR(pd
->cdrw
.thread
))
2562 kthread_stop(pd
->cdrw
.thread
);
2564 blkdev_put(pd
->bdev
);
2566 remove_proc_entry(pd
->name
, pkt_proc
);
2567 DPRINTK("pktcdvd: writer %s unmapped\n", pd
->name
);
2569 del_gendisk(pd
->disk
);
2570 blk_put_queue(pd
->disk
->queue
);
2573 pkt_devs
[idx
] = NULL
;
2574 mempool_destroy(pd
->rb_pool
);
2577 /* This is safe: open() is still holding a reference. */
2578 module_put(THIS_MODULE
);
2582 static void pkt_get_status(struct pkt_ctrl_command
*ctrl_cmd
)
2584 struct pktcdvd_device
*pd
= pkt_find_dev_from_minor(ctrl_cmd
->dev_index
);
2586 ctrl_cmd
->dev
= new_encode_dev(pd
->bdev
->bd_dev
);
2587 ctrl_cmd
->pkt_dev
= new_encode_dev(pd
->pkt_dev
);
2590 ctrl_cmd
->pkt_dev
= 0;
2592 ctrl_cmd
->num_devices
= MAX_WRITERS
;
2595 static int pkt_ctl_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
2597 void __user
*argp
= (void __user
*)arg
;
2598 struct pkt_ctrl_command ctrl_cmd
;
2601 if (cmd
!= PACKET_CTRL_CMD
)
2604 if (copy_from_user(&ctrl_cmd
, argp
, sizeof(struct pkt_ctrl_command
)))
2607 switch (ctrl_cmd
.command
) {
2608 case PKT_CTRL_CMD_SETUP
:
2609 if (!capable(CAP_SYS_ADMIN
))
2612 ret
= pkt_setup_dev(&ctrl_cmd
);
2615 case PKT_CTRL_CMD_TEARDOWN
:
2616 if (!capable(CAP_SYS_ADMIN
))
2619 ret
= pkt_remove_dev(&ctrl_cmd
);
2622 case PKT_CTRL_CMD_STATUS
:
2624 pkt_get_status(&ctrl_cmd
);
2631 if (copy_to_user(argp
, &ctrl_cmd
, sizeof(struct pkt_ctrl_command
)))
2637 static struct file_operations pkt_ctl_fops
= {
2638 .ioctl
= pkt_ctl_ioctl
,
2639 .owner
= THIS_MODULE
,
2642 static struct miscdevice pkt_misc
= {
2643 .minor
= MISC_DYNAMIC_MINOR
,
2645 .devfs_name
= "pktcdvd/control",
2646 .fops
= &pkt_ctl_fops
2649 static int __init
pkt_init(void)
2653 psd_pool
= mempool_create(PSD_POOL_SIZE
, psd_pool_alloc
, psd_pool_free
, NULL
);
2657 ret
= register_blkdev(pkt_major
, "pktcdvd");
2659 printk("pktcdvd: Unable to register block device\n");
2665 ret
= misc_register(&pkt_misc
);
2667 printk("pktcdvd: Unable to register misc device\n");
2671 init_MUTEX(&ctl_mutex
);
2673 pkt_proc
= proc_mkdir("pktcdvd", proc_root_driver
);
2678 unregister_blkdev(pkt_major
, "pktcdvd");
2680 mempool_destroy(psd_pool
);
2684 static void __exit
pkt_exit(void)
2686 remove_proc_entry("pktcdvd", proc_root_driver
);
2687 misc_deregister(&pkt_misc
);
2688 unregister_blkdev(pkt_major
, "pktcdvd");
2689 mempool_destroy(psd_pool
);
2692 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2693 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2694 MODULE_LICENSE("GPL");
2696 module_init(pkt_init
);
2697 module_exit(pkt_exit
);