2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
4 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
9 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
12 * Theory of operation:
14 * At the lowest level, there is the standard driver for the CD/DVD device,
15 * typically ide-cd.c or sr.c. This driver can handle read and write requests,
16 * but it doesn't know anything about the special restrictions that apply to
17 * packet writing. One restriction is that write requests must be aligned to
18 * packet boundaries on the physical media, and the size of a write request
19 * must be equal to the packet size. Another restriction is that a
20 * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
21 * command, if the previous command was a write.
23 * The purpose of the packet writing driver is to hide these restrictions from
24 * higher layers, such as file systems, and present a block device that can be
25 * randomly read and written using 2kB-sized blocks.
27 * The lowest layer in the packet writing driver is the packet I/O scheduler.
28 * Its data is defined by the struct packet_iosched and includes two bio
29 * queues with pending read and write requests. These queues are processed
30 * by the pkt_iosched_process_queue() function. The write requests in this
31 * queue are already properly aligned and sized. This layer is responsible for
32 * issuing the flush cache commands and scheduling the I/O in a good order.
34 * The next layer transforms unaligned write requests to aligned writes. This
35 * transformation requires reading missing pieces of data from the underlying
36 * block device, assembling the pieces to full packets and queuing them to the
37 * packet I/O scheduler.
39 * At the top layer there is a custom make_request_fn function that forwards
40 * read requests directly to the iosched queue and puts write requests in the
41 * unaligned write queue. A kernel thread performs the necessary read
42 * gathering to convert the unaligned writes to aligned writes and then feeds
43 * them to the packet I/O scheduler.
45 *************************************************************************/
47 #include <linux/pktcdvd.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/freezer.h>
59 #include <linux/mutex.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_ioctl.h>
62 #include <scsi/scsi.h>
63 #include <linux/debugfs.h>
64 #include <linux/device.h>
66 #include <asm/uaccess.h>
68 #define DRIVER_NAME "pktcdvd"
71 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
73 #define DPRINTK(fmt, args...)
77 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
79 #define VPRINTK(fmt, args...)
82 #define MAX_SPEED 0xffff
84 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
86 static struct pktcdvd_device
*pkt_devs
[MAX_WRITERS
];
87 static struct proc_dir_entry
*pkt_proc
;
88 static int pktdev_major
;
89 static int write_congestion_on
= PKT_WRITE_CONGESTION_ON
;
90 static int write_congestion_off
= PKT_WRITE_CONGESTION_OFF
;
91 static struct mutex ctl_mutex
; /* Serialize open/close/setup/teardown */
92 static mempool_t
*psd_pool
;
94 static struct class *class_pktcdvd
= NULL
; /* /sys/class/pktcdvd */
95 static struct dentry
*pkt_debugfs_root
= NULL
; /* /sys/kernel/debug/pktcdvd */
97 /* forward declaration */
98 static int pkt_setup_dev(dev_t dev
, dev_t
* pkt_dev
);
99 static int pkt_remove_dev(dev_t pkt_dev
);
100 static int pkt_seq_show(struct seq_file
*m
, void *p
);
105 * create and register a pktcdvd kernel object.
107 static struct pktcdvd_kobj
* pkt_kobj_create(struct pktcdvd_device
*pd
,
109 struct kobject
* parent
,
110 struct kobj_type
* ktype
)
112 struct pktcdvd_kobj
*p
;
115 p
= kzalloc(sizeof(*p
), GFP_KERNEL
);
119 error
= kobject_init_and_add(&p
->kobj
, ktype
, parent
, "%s", name
);
121 kobject_put(&p
->kobj
);
124 kobject_uevent(&p
->kobj
, KOBJ_ADD
);
128 * remove a pktcdvd kernel object.
130 static void pkt_kobj_remove(struct pktcdvd_kobj
*p
)
133 kobject_put(&p
->kobj
);
136 * default release function for pktcdvd kernel objects.
138 static void pkt_kobj_release(struct kobject
*kobj
)
140 kfree(to_pktcdvdkobj(kobj
));
144 /**********************************************************
146 * sysfs interface for pktcdvd
147 * by (C) 2006 Thomas Maier <balagi@justmail.de>
149 **********************************************************/
151 #define DEF_ATTR(_obj,_name,_mode) \
152 static struct attribute _obj = { .name = _name, .mode = _mode }
154 /**********************************************************
155 /sys/class/pktcdvd/pktcdvd[0-7]/
158 stat/packets_finished
163 write_queue/congestion_off
164 write_queue/congestion_on
165 **********************************************************/
167 DEF_ATTR(kobj_pkt_attr_st1
, "reset", 0200);
168 DEF_ATTR(kobj_pkt_attr_st2
, "packets_started", 0444);
169 DEF_ATTR(kobj_pkt_attr_st3
, "packets_finished", 0444);
170 DEF_ATTR(kobj_pkt_attr_st4
, "kb_written", 0444);
171 DEF_ATTR(kobj_pkt_attr_st5
, "kb_read", 0444);
172 DEF_ATTR(kobj_pkt_attr_st6
, "kb_read_gather", 0444);
174 static struct attribute
*kobj_pkt_attrs_stat
[] = {
184 DEF_ATTR(kobj_pkt_attr_wq1
, "size", 0444);
185 DEF_ATTR(kobj_pkt_attr_wq2
, "congestion_off", 0644);
186 DEF_ATTR(kobj_pkt_attr_wq3
, "congestion_on", 0644);
188 static struct attribute
*kobj_pkt_attrs_wqueue
[] = {
195 static ssize_t
kobj_pkt_show(struct kobject
*kobj
,
196 struct attribute
*attr
, char *data
)
198 struct pktcdvd_device
*pd
= to_pktcdvdkobj(kobj
)->pd
;
201 if (strcmp(attr
->name
, "packets_started") == 0) {
202 n
= sprintf(data
, "%lu\n", pd
->stats
.pkt_started
);
204 } else if (strcmp(attr
->name
, "packets_finished") == 0) {
205 n
= sprintf(data
, "%lu\n", pd
->stats
.pkt_ended
);
207 } else if (strcmp(attr
->name
, "kb_written") == 0) {
208 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_w
>> 1);
210 } else if (strcmp(attr
->name
, "kb_read") == 0) {
211 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_r
>> 1);
213 } else if (strcmp(attr
->name
, "kb_read_gather") == 0) {
214 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_rg
>> 1);
216 } else if (strcmp(attr
->name
, "size") == 0) {
217 spin_lock(&pd
->lock
);
218 v
= pd
->bio_queue_size
;
219 spin_unlock(&pd
->lock
);
220 n
= sprintf(data
, "%d\n", v
);
222 } else if (strcmp(attr
->name
, "congestion_off") == 0) {
223 spin_lock(&pd
->lock
);
224 v
= pd
->write_congestion_off
;
225 spin_unlock(&pd
->lock
);
226 n
= sprintf(data
, "%d\n", v
);
228 } else if (strcmp(attr
->name
, "congestion_on") == 0) {
229 spin_lock(&pd
->lock
);
230 v
= pd
->write_congestion_on
;
231 spin_unlock(&pd
->lock
);
232 n
= sprintf(data
, "%d\n", v
);
237 static void init_write_congestion_marks(int* lo
, int* hi
)
241 *hi
= min(*hi
, 1000000);
245 *lo
= min(*lo
, *hi
- 100);
254 static ssize_t
kobj_pkt_store(struct kobject
*kobj
,
255 struct attribute
*attr
,
256 const char *data
, size_t len
)
258 struct pktcdvd_device
*pd
= to_pktcdvdkobj(kobj
)->pd
;
261 if (strcmp(attr
->name
, "reset") == 0 && len
> 0) {
262 pd
->stats
.pkt_started
= 0;
263 pd
->stats
.pkt_ended
= 0;
264 pd
->stats
.secs_w
= 0;
265 pd
->stats
.secs_rg
= 0;
266 pd
->stats
.secs_r
= 0;
268 } else if (strcmp(attr
->name
, "congestion_off") == 0
269 && sscanf(data
, "%d", &val
) == 1) {
270 spin_lock(&pd
->lock
);
271 pd
->write_congestion_off
= val
;
272 init_write_congestion_marks(&pd
->write_congestion_off
,
273 &pd
->write_congestion_on
);
274 spin_unlock(&pd
->lock
);
276 } else if (strcmp(attr
->name
, "congestion_on") == 0
277 && sscanf(data
, "%d", &val
) == 1) {
278 spin_lock(&pd
->lock
);
279 pd
->write_congestion_on
= val
;
280 init_write_congestion_marks(&pd
->write_congestion_off
,
281 &pd
->write_congestion_on
);
282 spin_unlock(&pd
->lock
);
287 static struct sysfs_ops kobj_pkt_ops
= {
288 .show
= kobj_pkt_show
,
289 .store
= kobj_pkt_store
291 static struct kobj_type kobj_pkt_type_stat
= {
292 .release
= pkt_kobj_release
,
293 .sysfs_ops
= &kobj_pkt_ops
,
294 .default_attrs
= kobj_pkt_attrs_stat
296 static struct kobj_type kobj_pkt_type_wqueue
= {
297 .release
= pkt_kobj_release
,
298 .sysfs_ops
= &kobj_pkt_ops
,
299 .default_attrs
= kobj_pkt_attrs_wqueue
302 static void pkt_sysfs_dev_new(struct pktcdvd_device
*pd
)
305 pd
->dev
= device_create(class_pktcdvd
, NULL
, MKDEV(0, 0), NULL
,
311 pd
->kobj_stat
= pkt_kobj_create(pd
, "stat",
313 &kobj_pkt_type_stat
);
314 pd
->kobj_wqueue
= pkt_kobj_create(pd
, "write_queue",
316 &kobj_pkt_type_wqueue
);
320 static void pkt_sysfs_dev_remove(struct pktcdvd_device
*pd
)
322 pkt_kobj_remove(pd
->kobj_stat
);
323 pkt_kobj_remove(pd
->kobj_wqueue
);
325 device_unregister(pd
->dev
);
329 /********************************************************************
332 remove unmap packet dev
333 device_map show mappings
334 *******************************************************************/
336 static void class_pktcdvd_release(struct class *cls
)
340 static ssize_t
class_pktcdvd_show_map(struct class *c
, char *data
)
344 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
345 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
346 struct pktcdvd_device
*pd
= pkt_devs
[idx
];
349 n
+= sprintf(data
+n
, "%s %u:%u %u:%u\n",
351 MAJOR(pd
->pkt_dev
), MINOR(pd
->pkt_dev
),
352 MAJOR(pd
->bdev
->bd_dev
),
353 MINOR(pd
->bdev
->bd_dev
));
355 mutex_unlock(&ctl_mutex
);
359 static ssize_t
class_pktcdvd_store_add(struct class *c
, const char *buf
,
362 unsigned int major
, minor
;
364 if (sscanf(buf
, "%u:%u", &major
, &minor
) == 2) {
365 /* pkt_setup_dev() expects caller to hold reference to self */
366 if (!try_module_get(THIS_MODULE
))
369 pkt_setup_dev(MKDEV(major
, minor
), NULL
);
371 module_put(THIS_MODULE
);
379 static ssize_t
class_pktcdvd_store_remove(struct class *c
, const char *buf
,
382 unsigned int major
, minor
;
383 if (sscanf(buf
, "%u:%u", &major
, &minor
) == 2) {
384 pkt_remove_dev(MKDEV(major
, minor
));
390 static struct class_attribute class_pktcdvd_attrs
[] = {
391 __ATTR(add
, 0200, NULL
, class_pktcdvd_store_add
),
392 __ATTR(remove
, 0200, NULL
, class_pktcdvd_store_remove
),
393 __ATTR(device_map
, 0444, class_pktcdvd_show_map
, NULL
),
398 static int pkt_sysfs_init(void)
403 * create control files in sysfs
404 * /sys/class/pktcdvd/...
406 class_pktcdvd
= kzalloc(sizeof(*class_pktcdvd
), GFP_KERNEL
);
409 class_pktcdvd
->name
= DRIVER_NAME
;
410 class_pktcdvd
->owner
= THIS_MODULE
;
411 class_pktcdvd
->class_release
= class_pktcdvd_release
;
412 class_pktcdvd
->class_attrs
= class_pktcdvd_attrs
;
413 ret
= class_register(class_pktcdvd
);
415 kfree(class_pktcdvd
);
416 class_pktcdvd
= NULL
;
417 printk(DRIVER_NAME
": failed to create class pktcdvd\n");
423 static void pkt_sysfs_cleanup(void)
426 class_destroy(class_pktcdvd
);
427 class_pktcdvd
= NULL
;
430 /********************************************************************
433 /sys/kernel/debug/pktcdvd[0-7]/
436 *******************************************************************/
438 static int pkt_debugfs_seq_show(struct seq_file
*m
, void *p
)
440 return pkt_seq_show(m
, p
);
443 static int pkt_debugfs_fops_open(struct inode
*inode
, struct file
*file
)
445 return single_open(file
, pkt_debugfs_seq_show
, inode
->i_private
);
448 static const struct file_operations debug_fops
= {
449 .open
= pkt_debugfs_fops_open
,
452 .release
= single_release
,
453 .owner
= THIS_MODULE
,
456 static void pkt_debugfs_dev_new(struct pktcdvd_device
*pd
)
458 if (!pkt_debugfs_root
)
460 pd
->dfs_f_info
= NULL
;
461 pd
->dfs_d_root
= debugfs_create_dir(pd
->name
, pkt_debugfs_root
);
462 if (IS_ERR(pd
->dfs_d_root
)) {
463 pd
->dfs_d_root
= NULL
;
466 pd
->dfs_f_info
= debugfs_create_file("info", S_IRUGO
,
467 pd
->dfs_d_root
, pd
, &debug_fops
);
468 if (IS_ERR(pd
->dfs_f_info
)) {
469 pd
->dfs_f_info
= NULL
;
474 static void pkt_debugfs_dev_remove(struct pktcdvd_device
*pd
)
476 if (!pkt_debugfs_root
)
479 debugfs_remove(pd
->dfs_f_info
);
480 pd
->dfs_f_info
= NULL
;
482 debugfs_remove(pd
->dfs_d_root
);
483 pd
->dfs_d_root
= NULL
;
486 static void pkt_debugfs_init(void)
488 pkt_debugfs_root
= debugfs_create_dir(DRIVER_NAME
, NULL
);
489 if (IS_ERR(pkt_debugfs_root
)) {
490 pkt_debugfs_root
= NULL
;
495 static void pkt_debugfs_cleanup(void)
497 if (!pkt_debugfs_root
)
499 debugfs_remove(pkt_debugfs_root
);
500 pkt_debugfs_root
= NULL
;
503 /* ----------------------------------------------------------*/
506 static void pkt_bio_finished(struct pktcdvd_device
*pd
)
508 BUG_ON(atomic_read(&pd
->cdrw
.pending_bios
) <= 0);
509 if (atomic_dec_and_test(&pd
->cdrw
.pending_bios
)) {
510 VPRINTK(DRIVER_NAME
": queue empty\n");
511 atomic_set(&pd
->iosched
.attention
, 1);
512 wake_up(&pd
->wqueue
);
516 static void pkt_bio_destructor(struct bio
*bio
)
518 kfree(bio
->bi_io_vec
);
522 static struct bio
*pkt_bio_alloc(int nr_iovecs
)
524 struct bio_vec
*bvl
= NULL
;
527 bio
= kmalloc(sizeof(struct bio
), GFP_KERNEL
);
532 bvl
= kcalloc(nr_iovecs
, sizeof(struct bio_vec
), GFP_KERNEL
);
536 bio
->bi_max_vecs
= nr_iovecs
;
537 bio
->bi_io_vec
= bvl
;
538 bio
->bi_destructor
= pkt_bio_destructor
;
549 * Allocate a packet_data struct
551 static struct packet_data
*pkt_alloc_packet_data(int frames
)
554 struct packet_data
*pkt
;
556 pkt
= kzalloc(sizeof(struct packet_data
), GFP_KERNEL
);
560 pkt
->frames
= frames
;
561 pkt
->w_bio
= pkt_bio_alloc(frames
);
565 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++) {
566 pkt
->pages
[i
] = alloc_page(GFP_KERNEL
|__GFP_ZERO
);
571 spin_lock_init(&pkt
->lock
);
572 bio_list_init(&pkt
->orig_bios
);
574 for (i
= 0; i
< frames
; i
++) {
575 struct bio
*bio
= pkt_bio_alloc(1);
578 pkt
->r_bios
[i
] = bio
;
584 for (i
= 0; i
< frames
; i
++) {
585 struct bio
*bio
= pkt
->r_bios
[i
];
591 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++)
593 __free_page(pkt
->pages
[i
]);
602 * Free a packet_data struct
604 static void pkt_free_packet_data(struct packet_data
*pkt
)
608 for (i
= 0; i
< pkt
->frames
; i
++) {
609 struct bio
*bio
= pkt
->r_bios
[i
];
613 for (i
= 0; i
< pkt
->frames
/ FRAMES_PER_PAGE
; i
++)
614 __free_page(pkt
->pages
[i
]);
619 static void pkt_shrink_pktlist(struct pktcdvd_device
*pd
)
621 struct packet_data
*pkt
, *next
;
623 BUG_ON(!list_empty(&pd
->cdrw
.pkt_active_list
));
625 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_free_list
, list
) {
626 pkt_free_packet_data(pkt
);
628 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
631 static int pkt_grow_pktlist(struct pktcdvd_device
*pd
, int nr_packets
)
633 struct packet_data
*pkt
;
635 BUG_ON(!list_empty(&pd
->cdrw
.pkt_free_list
));
637 while (nr_packets
> 0) {
638 pkt
= pkt_alloc_packet_data(pd
->settings
.size
>> 2);
640 pkt_shrink_pktlist(pd
);
643 pkt
->id
= nr_packets
;
645 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
651 static inline struct pkt_rb_node
*pkt_rbtree_next(struct pkt_rb_node
*node
)
653 struct rb_node
*n
= rb_next(&node
->rb_node
);
656 return rb_entry(n
, struct pkt_rb_node
, rb_node
);
659 static void pkt_rbtree_erase(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
661 rb_erase(&node
->rb_node
, &pd
->bio_queue
);
662 mempool_free(node
, pd
->rb_pool
);
663 pd
->bio_queue_size
--;
664 BUG_ON(pd
->bio_queue_size
< 0);
668 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
670 static struct pkt_rb_node
*pkt_rbtree_find(struct pktcdvd_device
*pd
, sector_t s
)
672 struct rb_node
*n
= pd
->bio_queue
.rb_node
;
673 struct rb_node
*next
;
674 struct pkt_rb_node
*tmp
;
677 BUG_ON(pd
->bio_queue_size
> 0);
682 tmp
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
683 if (s
<= tmp
->bio
->bi_sector
)
692 if (s
> tmp
->bio
->bi_sector
) {
693 tmp
= pkt_rbtree_next(tmp
);
697 BUG_ON(s
> tmp
->bio
->bi_sector
);
702 * Insert a node into the pd->bio_queue rb tree.
704 static void pkt_rbtree_insert(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
706 struct rb_node
**p
= &pd
->bio_queue
.rb_node
;
707 struct rb_node
*parent
= NULL
;
708 sector_t s
= node
->bio
->bi_sector
;
709 struct pkt_rb_node
*tmp
;
713 tmp
= rb_entry(parent
, struct pkt_rb_node
, rb_node
);
714 if (s
< tmp
->bio
->bi_sector
)
719 rb_link_node(&node
->rb_node
, parent
, p
);
720 rb_insert_color(&node
->rb_node
, &pd
->bio_queue
);
721 pd
->bio_queue_size
++;
725 * Send a packet_command to the underlying block device and
726 * wait for completion.
728 static int pkt_generic_packet(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
730 struct request_queue
*q
= bdev_get_queue(pd
->bdev
);
734 rq
= blk_get_request(q
, (cgc
->data_direction
== CGC_DATA_WRITE
) ?
735 WRITE
: READ
, __GFP_WAIT
);
738 if (blk_rq_map_kern(q
, rq
, cgc
->buffer
, cgc
->buflen
, __GFP_WAIT
))
742 rq
->cmd_len
= COMMAND_SIZE(cgc
->cmd
[0]);
743 memcpy(rq
->cmd
, cgc
->cmd
, CDROM_PACKET_SIZE
);
746 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
747 rq
->cmd_flags
|= REQ_HARDBARRIER
;
749 rq
->cmd_flags
|= REQ_QUIET
;
751 blk_execute_rq(rq
->q
, pd
->bdev
->bd_disk
, rq
, 0);
760 * A generic sense dump / resolve mechanism should be implemented across
761 * all ATAPI + SCSI devices.
763 static void pkt_dump_sense(struct packet_command
*cgc
)
765 static char *info
[9] = { "No sense", "Recovered error", "Not ready",
766 "Medium error", "Hardware error", "Illegal request",
767 "Unit attention", "Data protect", "Blank check" };
769 struct request_sense
*sense
= cgc
->sense
;
771 printk(DRIVER_NAME
":");
772 for (i
= 0; i
< CDROM_PACKET_SIZE
; i
++)
773 printk(" %02x", cgc
->cmd
[i
]);
777 printk("no sense\n");
781 printk("sense %02x.%02x.%02x", sense
->sense_key
, sense
->asc
, sense
->ascq
);
783 if (sense
->sense_key
> 8) {
784 printk(" (INVALID)\n");
788 printk(" (%s)\n", info
[sense
->sense_key
]);
792 * flush the drive cache to media
794 static int pkt_flush_cache(struct pktcdvd_device
*pd
)
796 struct packet_command cgc
;
798 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
799 cgc
.cmd
[0] = GPCMD_FLUSH_CACHE
;
803 * the IMMED bit -- we default to not setting it, although that
804 * would allow a much faster close, this is safer
809 return pkt_generic_packet(pd
, &cgc
);
813 * speed is given as the normal factor, e.g. 4 for 4x
815 static noinline_for_stack
int pkt_set_speed(struct pktcdvd_device
*pd
,
816 unsigned write_speed
, unsigned read_speed
)
818 struct packet_command cgc
;
819 struct request_sense sense
;
822 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
824 cgc
.cmd
[0] = GPCMD_SET_SPEED
;
825 cgc
.cmd
[2] = (read_speed
>> 8) & 0xff;
826 cgc
.cmd
[3] = read_speed
& 0xff;
827 cgc
.cmd
[4] = (write_speed
>> 8) & 0xff;
828 cgc
.cmd
[5] = write_speed
& 0xff;
830 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
831 pkt_dump_sense(&cgc
);
837 * Queue a bio for processing by the low-level CD device. Must be called
838 * from process context.
840 static void pkt_queue_bio(struct pktcdvd_device
*pd
, struct bio
*bio
)
842 spin_lock(&pd
->iosched
.lock
);
843 if (bio_data_dir(bio
) == READ
)
844 bio_list_add(&pd
->iosched
.read_queue
, bio
);
846 bio_list_add(&pd
->iosched
.write_queue
, bio
);
847 spin_unlock(&pd
->iosched
.lock
);
849 atomic_set(&pd
->iosched
.attention
, 1);
850 wake_up(&pd
->wqueue
);
854 * Process the queued read/write requests. This function handles special
855 * requirements for CDRW drives:
856 * - A cache flush command must be inserted before a read request if the
857 * previous request was a write.
858 * - Switching between reading and writing is slow, so don't do it more often
860 * - Optimize for throughput at the expense of latency. This means that streaming
861 * writes will never be interrupted by a read, but if the drive has to seek
862 * before the next write, switch to reading instead if there are any pending
864 * - Set the read speed according to current usage pattern. When only reading
865 * from the device, it's best to use the highest possible read speed, but
866 * when switching often between reading and writing, it's better to have the
867 * same read and write speeds.
869 static void pkt_iosched_process_queue(struct pktcdvd_device
*pd
)
872 if (atomic_read(&pd
->iosched
.attention
) == 0)
874 atomic_set(&pd
->iosched
.attention
, 0);
878 int reads_queued
, writes_queued
;
880 spin_lock(&pd
->iosched
.lock
);
881 reads_queued
= !bio_list_empty(&pd
->iosched
.read_queue
);
882 writes_queued
= !bio_list_empty(&pd
->iosched
.write_queue
);
883 spin_unlock(&pd
->iosched
.lock
);
885 if (!reads_queued
&& !writes_queued
)
888 if (pd
->iosched
.writing
) {
889 int need_write_seek
= 1;
890 spin_lock(&pd
->iosched
.lock
);
891 bio
= bio_list_peek(&pd
->iosched
.write_queue
);
892 spin_unlock(&pd
->iosched
.lock
);
893 if (bio
&& (bio
->bi_sector
== pd
->iosched
.last_write
))
895 if (need_write_seek
&& reads_queued
) {
896 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
897 VPRINTK(DRIVER_NAME
": write, waiting\n");
901 pd
->iosched
.writing
= 0;
904 if (!reads_queued
&& writes_queued
) {
905 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
906 VPRINTK(DRIVER_NAME
": read, waiting\n");
909 pd
->iosched
.writing
= 1;
913 spin_lock(&pd
->iosched
.lock
);
914 if (pd
->iosched
.writing
)
915 bio
= bio_list_pop(&pd
->iosched
.write_queue
);
917 bio
= bio_list_pop(&pd
->iosched
.read_queue
);
918 spin_unlock(&pd
->iosched
.lock
);
923 if (bio_data_dir(bio
) == READ
)
924 pd
->iosched
.successive_reads
+= bio
->bi_size
>> 10;
926 pd
->iosched
.successive_reads
= 0;
927 pd
->iosched
.last_write
= bio
->bi_sector
+ bio_sectors(bio
);
929 if (pd
->iosched
.successive_reads
>= HI_SPEED_SWITCH
) {
930 if (pd
->read_speed
== pd
->write_speed
) {
931 pd
->read_speed
= MAX_SPEED
;
932 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
935 if (pd
->read_speed
!= pd
->write_speed
) {
936 pd
->read_speed
= pd
->write_speed
;
937 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
941 atomic_inc(&pd
->cdrw
.pending_bios
);
942 generic_make_request(bio
);
947 * Special care is needed if the underlying block device has a small
948 * max_phys_segments value.
950 static int pkt_set_segment_merging(struct pktcdvd_device
*pd
, struct request_queue
*q
)
952 if ((pd
->settings
.size
<< 9) / CD_FRAMESIZE
953 <= queue_max_segments(q
)) {
955 * The cdrom device can handle one segment/frame
957 clear_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
959 } else if ((pd
->settings
.size
<< 9) / PAGE_SIZE
960 <= queue_max_segments(q
)) {
962 * We can handle this case at the expense of some extra memory
963 * copies during write operations
965 set_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
968 printk(DRIVER_NAME
": cdrom max_phys_segments too small\n");
974 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
976 static void pkt_copy_bio_data(struct bio
*src_bio
, int seg
, int offs
, struct page
*dst_page
, int dst_offs
)
978 unsigned int copy_size
= CD_FRAMESIZE
;
980 while (copy_size
> 0) {
981 struct bio_vec
*src_bvl
= bio_iovec_idx(src_bio
, seg
);
982 void *vfrom
= kmap_atomic(src_bvl
->bv_page
, KM_USER0
) +
983 src_bvl
->bv_offset
+ offs
;
984 void *vto
= page_address(dst_page
) + dst_offs
;
985 int len
= min_t(int, copy_size
, src_bvl
->bv_len
- offs
);
988 memcpy(vto
, vfrom
, len
);
989 kunmap_atomic(vfrom
, KM_USER0
);
999 * Copy all data for this packet to pkt->pages[], so that
1000 * a) The number of required segments for the write bio is minimized, which
1001 * is necessary for some scsi controllers.
1002 * b) The data can be used as cache to avoid read requests if we receive a
1003 * new write request for the same zone.
1005 static void pkt_make_local_copy(struct packet_data
*pkt
, struct bio_vec
*bvec
)
1009 /* Copy all data to pkt->pages[] */
1012 for (f
= 0; f
< pkt
->frames
; f
++) {
1013 if (bvec
[f
].bv_page
!= pkt
->pages
[p
]) {
1014 void *vfrom
= kmap_atomic(bvec
[f
].bv_page
, KM_USER0
) + bvec
[f
].bv_offset
;
1015 void *vto
= page_address(pkt
->pages
[p
]) + offs
;
1016 memcpy(vto
, vfrom
, CD_FRAMESIZE
);
1017 kunmap_atomic(vfrom
, KM_USER0
);
1018 bvec
[f
].bv_page
= pkt
->pages
[p
];
1019 bvec
[f
].bv_offset
= offs
;
1021 BUG_ON(bvec
[f
].bv_offset
!= offs
);
1023 offs
+= CD_FRAMESIZE
;
1024 if (offs
>= PAGE_SIZE
) {
1031 static void pkt_end_io_read(struct bio
*bio
, int err
)
1033 struct packet_data
*pkt
= bio
->bi_private
;
1034 struct pktcdvd_device
*pd
= pkt
->pd
;
1037 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio
,
1038 (unsigned long long)pkt
->sector
, (unsigned long long)bio
->bi_sector
, err
);
1041 atomic_inc(&pkt
->io_errors
);
1042 if (atomic_dec_and_test(&pkt
->io_wait
)) {
1043 atomic_inc(&pkt
->run_sm
);
1044 wake_up(&pd
->wqueue
);
1046 pkt_bio_finished(pd
);
1049 static void pkt_end_io_packet_write(struct bio
*bio
, int err
)
1051 struct packet_data
*pkt
= bio
->bi_private
;
1052 struct pktcdvd_device
*pd
= pkt
->pd
;
1055 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt
->id
, err
);
1057 pd
->stats
.pkt_ended
++;
1059 pkt_bio_finished(pd
);
1060 atomic_dec(&pkt
->io_wait
);
1061 atomic_inc(&pkt
->run_sm
);
1062 wake_up(&pd
->wqueue
);
1066 * Schedule reads for the holes in a packet
1068 static void pkt_gather_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1070 int frames_read
= 0;
1073 char written
[PACKET_MAX_SIZE
];
1075 BUG_ON(bio_list_empty(&pkt
->orig_bios
));
1077 atomic_set(&pkt
->io_wait
, 0);
1078 atomic_set(&pkt
->io_errors
, 0);
1081 * Figure out which frames we need to read before we can write.
1083 memset(written
, 0, sizeof(written
));
1084 spin_lock(&pkt
->lock
);
1085 bio_list_for_each(bio
, &pkt
->orig_bios
) {
1086 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1087 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1088 pd
->stats
.secs_w
+= num_frames
* (CD_FRAMESIZE
>> 9);
1089 BUG_ON(first_frame
< 0);
1090 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1091 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++)
1094 spin_unlock(&pkt
->lock
);
1096 if (pkt
->cache_valid
) {
1097 VPRINTK("pkt_gather_data: zone %llx cached\n",
1098 (unsigned long long)pkt
->sector
);
1103 * Schedule reads for missing parts of the packet.
1105 for (f
= 0; f
< pkt
->frames
; f
++) {
1106 struct bio_vec
*vec
;
1111 bio
= pkt
->r_bios
[f
];
1112 vec
= bio
->bi_io_vec
;
1114 bio
->bi_max_vecs
= 1;
1115 bio
->bi_sector
= pkt
->sector
+ f
* (CD_FRAMESIZE
>> 9);
1116 bio
->bi_bdev
= pd
->bdev
;
1117 bio
->bi_end_io
= pkt_end_io_read
;
1118 bio
->bi_private
= pkt
;
1119 bio
->bi_io_vec
= vec
;
1120 bio
->bi_destructor
= pkt_bio_destructor
;
1122 p
= (f
* CD_FRAMESIZE
) / PAGE_SIZE
;
1123 offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1124 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1125 f
, pkt
->pages
[p
], offset
);
1126 if (!bio_add_page(bio
, pkt
->pages
[p
], CD_FRAMESIZE
, offset
))
1129 atomic_inc(&pkt
->io_wait
);
1131 pkt_queue_bio(pd
, bio
);
1136 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1137 frames_read
, (unsigned long long)pkt
->sector
);
1138 pd
->stats
.pkt_started
++;
1139 pd
->stats
.secs_rg
+= frames_read
* (CD_FRAMESIZE
>> 9);
1143 * Find a packet matching zone, or the least recently used packet if
1144 * there is no match.
1146 static struct packet_data
*pkt_get_packet_data(struct pktcdvd_device
*pd
, int zone
)
1148 struct packet_data
*pkt
;
1150 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_free_list
, list
) {
1151 if (pkt
->sector
== zone
|| pkt
->list
.next
== &pd
->cdrw
.pkt_free_list
) {
1152 list_del_init(&pkt
->list
);
1153 if (pkt
->sector
!= zone
)
1154 pkt
->cache_valid
= 0;
1162 static void pkt_put_packet_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1164 if (pkt
->cache_valid
) {
1165 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1167 list_add_tail(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1172 * recover a failed write, query for relocation if possible
1174 * returns 1 if recovery is possible, or 0 if not
1177 static int pkt_start_recovery(struct packet_data
*pkt
)
1180 * FIXME. We need help from the file system to implement
1181 * recovery handling.
1185 struct request
*rq
= pkt
->rq
;
1186 struct pktcdvd_device
*pd
= rq
->rq_disk
->private_data
;
1187 struct block_device
*pkt_bdev
;
1188 struct super_block
*sb
= NULL
;
1189 unsigned long old_block
, new_block
;
1190 sector_t new_sector
;
1192 pkt_bdev
= bdget(kdev_t_to_nr(pd
->pkt_dev
));
1194 sb
= get_super(pkt_bdev
);
1201 if (!sb
->s_op
|| !sb
->s_op
->relocate_blocks
)
1204 old_block
= pkt
->sector
/ (CD_FRAMESIZE
>> 9);
1205 if (sb
->s_op
->relocate_blocks(sb
, old_block
, &new_block
))
1208 new_sector
= new_block
* (CD_FRAMESIZE
>> 9);
1209 pkt
->sector
= new_sector
;
1211 pkt
->bio
->bi_sector
= new_sector
;
1212 pkt
->bio
->bi_next
= NULL
;
1213 pkt
->bio
->bi_flags
= 1 << BIO_UPTODATE
;
1214 pkt
->bio
->bi_idx
= 0;
1216 BUG_ON(pkt
->bio
->bi_rw
!= (1 << BIO_RW
));
1217 BUG_ON(pkt
->bio
->bi_vcnt
!= pkt
->frames
);
1218 BUG_ON(pkt
->bio
->bi_size
!= pkt
->frames
* CD_FRAMESIZE
);
1219 BUG_ON(pkt
->bio
->bi_end_io
!= pkt_end_io_packet_write
);
1220 BUG_ON(pkt
->bio
->bi_private
!= pkt
);
1231 static inline void pkt_set_state(struct packet_data
*pkt
, enum packet_data_state state
)
1233 #if PACKET_DEBUG > 1
1234 static const char *state_name
[] = {
1235 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1237 enum packet_data_state old_state
= pkt
->state
;
1238 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt
->id
, (unsigned long long)pkt
->sector
,
1239 state_name
[old_state
], state_name
[state
]);
1245 * Scan the work queue to see if we can start a new packet.
1246 * returns non-zero if any work was done.
1248 static int pkt_handle_queue(struct pktcdvd_device
*pd
)
1250 struct packet_data
*pkt
, *p
;
1251 struct bio
*bio
= NULL
;
1252 sector_t zone
= 0; /* Suppress gcc warning */
1253 struct pkt_rb_node
*node
, *first_node
;
1257 VPRINTK("handle_queue\n");
1259 atomic_set(&pd
->scan_queue
, 0);
1261 if (list_empty(&pd
->cdrw
.pkt_free_list
)) {
1262 VPRINTK("handle_queue: no pkt\n");
1267 * Try to find a zone we are not already working on.
1269 spin_lock(&pd
->lock
);
1270 first_node
= pkt_rbtree_find(pd
, pd
->current_sector
);
1272 n
= rb_first(&pd
->bio_queue
);
1274 first_node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1279 zone
= ZONE(bio
->bi_sector
, pd
);
1280 list_for_each_entry(p
, &pd
->cdrw
.pkt_active_list
, list
) {
1281 if (p
->sector
== zone
) {
1288 node
= pkt_rbtree_next(node
);
1290 n
= rb_first(&pd
->bio_queue
);
1292 node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1294 if (node
== first_node
)
1297 spin_unlock(&pd
->lock
);
1299 VPRINTK("handle_queue: no bio\n");
1303 pkt
= pkt_get_packet_data(pd
, zone
);
1305 pd
->current_sector
= zone
+ pd
->settings
.size
;
1307 BUG_ON(pkt
->frames
!= pd
->settings
.size
>> 2);
1308 pkt
->write_size
= 0;
1311 * Scan work queue for bios in the same zone and link them
1314 spin_lock(&pd
->lock
);
1315 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone
);
1316 while ((node
= pkt_rbtree_find(pd
, zone
)) != NULL
) {
1318 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1319 (unsigned long long)ZONE(bio
->bi_sector
, pd
));
1320 if (ZONE(bio
->bi_sector
, pd
) != zone
)
1322 pkt_rbtree_erase(pd
, node
);
1323 spin_lock(&pkt
->lock
);
1324 bio_list_add(&pkt
->orig_bios
, bio
);
1325 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
1326 spin_unlock(&pkt
->lock
);
1328 /* check write congestion marks, and if bio_queue_size is
1329 below, wake up any waiters */
1330 wakeup
= (pd
->write_congestion_on
> 0
1331 && pd
->bio_queue_size
<= pd
->write_congestion_off
);
1332 spin_unlock(&pd
->lock
);
1334 clear_bdi_congested(&pd
->disk
->queue
->backing_dev_info
,
1338 pkt
->sleep_time
= max(PACKET_WAIT_TIME
, 1);
1339 pkt_set_state(pkt
, PACKET_WAITING_STATE
);
1340 atomic_set(&pkt
->run_sm
, 1);
1342 spin_lock(&pd
->cdrw
.active_list_lock
);
1343 list_add(&pkt
->list
, &pd
->cdrw
.pkt_active_list
);
1344 spin_unlock(&pd
->cdrw
.active_list_lock
);
1350 * Assemble a bio to write one packet and queue the bio for processing
1351 * by the underlying block device.
1353 static void pkt_start_write(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1358 struct bio_vec
*bvec
= pkt
->w_bio
->bi_io_vec
;
1360 for (f
= 0; f
< pkt
->frames
; f
++) {
1361 bvec
[f
].bv_page
= pkt
->pages
[(f
* CD_FRAMESIZE
) / PAGE_SIZE
];
1362 bvec
[f
].bv_offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1366 * Fill-in bvec with data from orig_bios.
1369 spin_lock(&pkt
->lock
);
1370 bio_list_for_each(bio
, &pkt
->orig_bios
) {
1371 int segment
= bio
->bi_idx
;
1373 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1374 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1375 BUG_ON(first_frame
< 0);
1376 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1377 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++) {
1378 struct bio_vec
*src_bvl
= bio_iovec_idx(bio
, segment
);
1380 while (src_offs
>= src_bvl
->bv_len
) {
1381 src_offs
-= src_bvl
->bv_len
;
1383 BUG_ON(segment
>= bio
->bi_vcnt
);
1384 src_bvl
= bio_iovec_idx(bio
, segment
);
1387 if (src_bvl
->bv_len
- src_offs
>= CD_FRAMESIZE
) {
1388 bvec
[f
].bv_page
= src_bvl
->bv_page
;
1389 bvec
[f
].bv_offset
= src_bvl
->bv_offset
+ src_offs
;
1391 pkt_copy_bio_data(bio
, segment
, src_offs
,
1392 bvec
[f
].bv_page
, bvec
[f
].bv_offset
);
1394 src_offs
+= CD_FRAMESIZE
;
1398 pkt_set_state(pkt
, PACKET_WRITE_WAIT_STATE
);
1399 spin_unlock(&pkt
->lock
);
1401 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1402 frames_write
, (unsigned long long)pkt
->sector
);
1403 BUG_ON(frames_write
!= pkt
->write_size
);
1405 if (test_bit(PACKET_MERGE_SEGS
, &pd
->flags
) || (pkt
->write_size
< pkt
->frames
)) {
1406 pkt_make_local_copy(pkt
, bvec
);
1407 pkt
->cache_valid
= 1;
1409 pkt
->cache_valid
= 0;
1412 /* Start the write request */
1413 bio_init(pkt
->w_bio
);
1414 pkt
->w_bio
->bi_max_vecs
= PACKET_MAX_SIZE
;
1415 pkt
->w_bio
->bi_sector
= pkt
->sector
;
1416 pkt
->w_bio
->bi_bdev
= pd
->bdev
;
1417 pkt
->w_bio
->bi_end_io
= pkt_end_io_packet_write
;
1418 pkt
->w_bio
->bi_private
= pkt
;
1419 pkt
->w_bio
->bi_io_vec
= bvec
;
1420 pkt
->w_bio
->bi_destructor
= pkt_bio_destructor
;
1421 for (f
= 0; f
< pkt
->frames
; f
++)
1422 if (!bio_add_page(pkt
->w_bio
, bvec
[f
].bv_page
, CD_FRAMESIZE
, bvec
[f
].bv_offset
))
1424 VPRINTK(DRIVER_NAME
": vcnt=%d\n", pkt
->w_bio
->bi_vcnt
);
1426 atomic_set(&pkt
->io_wait
, 1);
1427 pkt
->w_bio
->bi_rw
= WRITE
;
1428 pkt_queue_bio(pd
, pkt
->w_bio
);
1431 static void pkt_finish_packet(struct packet_data
*pkt
, int uptodate
)
1436 pkt
->cache_valid
= 0;
1438 /* Finish all bios corresponding to this packet */
1439 while ((bio
= bio_list_pop(&pkt
->orig_bios
)))
1440 bio_endio(bio
, uptodate
? 0 : -EIO
);
1443 static void pkt_run_state_machine(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1447 VPRINTK("run_state_machine: pkt %d\n", pkt
->id
);
1450 switch (pkt
->state
) {
1451 case PACKET_WAITING_STATE
:
1452 if ((pkt
->write_size
< pkt
->frames
) && (pkt
->sleep_time
> 0))
1455 pkt
->sleep_time
= 0;
1456 pkt_gather_data(pd
, pkt
);
1457 pkt_set_state(pkt
, PACKET_READ_WAIT_STATE
);
1460 case PACKET_READ_WAIT_STATE
:
1461 if (atomic_read(&pkt
->io_wait
) > 0)
1464 if (atomic_read(&pkt
->io_errors
) > 0) {
1465 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1467 pkt_start_write(pd
, pkt
);
1471 case PACKET_WRITE_WAIT_STATE
:
1472 if (atomic_read(&pkt
->io_wait
) > 0)
1475 if (test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
)) {
1476 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1478 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1482 case PACKET_RECOVERY_STATE
:
1483 if (pkt_start_recovery(pkt
)) {
1484 pkt_start_write(pd
, pkt
);
1486 VPRINTK("No recovery possible\n");
1487 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1491 case PACKET_FINISHED_STATE
:
1492 uptodate
= test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
);
1493 pkt_finish_packet(pkt
, uptodate
);
1503 static void pkt_handle_packets(struct pktcdvd_device
*pd
)
1505 struct packet_data
*pkt
, *next
;
1507 VPRINTK("pkt_handle_packets\n");
1510 * Run state machine for active packets
1512 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1513 if (atomic_read(&pkt
->run_sm
) > 0) {
1514 atomic_set(&pkt
->run_sm
, 0);
1515 pkt_run_state_machine(pd
, pkt
);
1520 * Move no longer active packets to the free list
1522 spin_lock(&pd
->cdrw
.active_list_lock
);
1523 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_active_list
, list
) {
1524 if (pkt
->state
== PACKET_FINISHED_STATE
) {
1525 list_del(&pkt
->list
);
1526 pkt_put_packet_data(pd
, pkt
);
1527 pkt_set_state(pkt
, PACKET_IDLE_STATE
);
1528 atomic_set(&pd
->scan_queue
, 1);
1531 spin_unlock(&pd
->cdrw
.active_list_lock
);
1534 static void pkt_count_states(struct pktcdvd_device
*pd
, int *states
)
1536 struct packet_data
*pkt
;
1539 for (i
= 0; i
< PACKET_NUM_STATES
; i
++)
1542 spin_lock(&pd
->cdrw
.active_list_lock
);
1543 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1544 states
[pkt
->state
]++;
1546 spin_unlock(&pd
->cdrw
.active_list_lock
);
1550 * kcdrwd is woken up when writes have been queued for one of our
1551 * registered devices
1553 static int kcdrwd(void *foobar
)
1555 struct pktcdvd_device
*pd
= foobar
;
1556 struct packet_data
*pkt
;
1557 long min_sleep_time
, residue
;
1559 set_user_nice(current
, -20);
1563 DECLARE_WAITQUEUE(wait
, current
);
1566 * Wait until there is something to do
1568 add_wait_queue(&pd
->wqueue
, &wait
);
1570 set_current_state(TASK_INTERRUPTIBLE
);
1572 /* Check if we need to run pkt_handle_queue */
1573 if (atomic_read(&pd
->scan_queue
) > 0)
1576 /* Check if we need to run the state machine for some packet */
1577 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1578 if (atomic_read(&pkt
->run_sm
) > 0)
1582 /* Check if we need to process the iosched queues */
1583 if (atomic_read(&pd
->iosched
.attention
) != 0)
1586 /* Otherwise, go to sleep */
1587 if (PACKET_DEBUG
> 1) {
1588 int states
[PACKET_NUM_STATES
];
1589 pkt_count_states(pd
, states
);
1590 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1591 states
[0], states
[1], states
[2], states
[3],
1592 states
[4], states
[5]);
1595 min_sleep_time
= MAX_SCHEDULE_TIMEOUT
;
1596 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1597 if (pkt
->sleep_time
&& pkt
->sleep_time
< min_sleep_time
)
1598 min_sleep_time
= pkt
->sleep_time
;
1601 generic_unplug_device(bdev_get_queue(pd
->bdev
));
1603 VPRINTK("kcdrwd: sleeping\n");
1604 residue
= schedule_timeout(min_sleep_time
);
1605 VPRINTK("kcdrwd: wake up\n");
1607 /* make swsusp happy with our thread */
1610 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1611 if (!pkt
->sleep_time
)
1613 pkt
->sleep_time
-= min_sleep_time
- residue
;
1614 if (pkt
->sleep_time
<= 0) {
1615 pkt
->sleep_time
= 0;
1616 atomic_inc(&pkt
->run_sm
);
1620 if (kthread_should_stop())
1624 set_current_state(TASK_RUNNING
);
1625 remove_wait_queue(&pd
->wqueue
, &wait
);
1627 if (kthread_should_stop())
1631 * if pkt_handle_queue returns true, we can queue
1634 while (pkt_handle_queue(pd
))
1638 * Handle packet state machine
1640 pkt_handle_packets(pd
);
1643 * Handle iosched queues
1645 pkt_iosched_process_queue(pd
);
1651 static void pkt_print_settings(struct pktcdvd_device
*pd
)
1653 printk(DRIVER_NAME
": %s packets, ", pd
->settings
.fp
? "Fixed" : "Variable");
1654 printk("%u blocks, ", pd
->settings
.size
>> 2);
1655 printk("Mode-%c disc\n", pd
->settings
.block_mode
== 8 ? '1' : '2');
1658 static int pkt_mode_sense(struct pktcdvd_device
*pd
, struct packet_command
*cgc
, int page_code
, int page_control
)
1660 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1662 cgc
->cmd
[0] = GPCMD_MODE_SENSE_10
;
1663 cgc
->cmd
[2] = page_code
| (page_control
<< 6);
1664 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1665 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1666 cgc
->data_direction
= CGC_DATA_READ
;
1667 return pkt_generic_packet(pd
, cgc
);
1670 static int pkt_mode_select(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
1672 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1673 memset(cgc
->buffer
, 0, 2);
1674 cgc
->cmd
[0] = GPCMD_MODE_SELECT_10
;
1675 cgc
->cmd
[1] = 0x10; /* PF */
1676 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1677 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1678 cgc
->data_direction
= CGC_DATA_WRITE
;
1679 return pkt_generic_packet(pd
, cgc
);
1682 static int pkt_get_disc_info(struct pktcdvd_device
*pd
, disc_information
*di
)
1684 struct packet_command cgc
;
1687 /* set up command and get the disc info */
1688 init_cdrom_command(&cgc
, di
, sizeof(*di
), CGC_DATA_READ
);
1689 cgc
.cmd
[0] = GPCMD_READ_DISC_INFO
;
1690 cgc
.cmd
[8] = cgc
.buflen
= 2;
1693 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1696 /* not all drives have the same disc_info length, so requeue
1697 * packet with the length the drive tells us it can supply
1699 cgc
.buflen
= be16_to_cpu(di
->disc_information_length
) +
1700 sizeof(di
->disc_information_length
);
1702 if (cgc
.buflen
> sizeof(disc_information
))
1703 cgc
.buflen
= sizeof(disc_information
);
1705 cgc
.cmd
[8] = cgc
.buflen
;
1706 return pkt_generic_packet(pd
, &cgc
);
1709 static int pkt_get_track_info(struct pktcdvd_device
*pd
, __u16 track
, __u8 type
, track_information
*ti
)
1711 struct packet_command cgc
;
1714 init_cdrom_command(&cgc
, ti
, 8, CGC_DATA_READ
);
1715 cgc
.cmd
[0] = GPCMD_READ_TRACK_RZONE_INFO
;
1716 cgc
.cmd
[1] = type
& 3;
1717 cgc
.cmd
[4] = (track
& 0xff00) >> 8;
1718 cgc
.cmd
[5] = track
& 0xff;
1722 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1725 cgc
.buflen
= be16_to_cpu(ti
->track_information_length
) +
1726 sizeof(ti
->track_information_length
);
1728 if (cgc
.buflen
> sizeof(track_information
))
1729 cgc
.buflen
= sizeof(track_information
);
1731 cgc
.cmd
[8] = cgc
.buflen
;
1732 return pkt_generic_packet(pd
, &cgc
);
1735 static noinline_for_stack
int pkt_get_last_written(struct pktcdvd_device
*pd
,
1738 disc_information di
;
1739 track_information ti
;
1743 if ((ret
= pkt_get_disc_info(pd
, &di
)))
1746 last_track
= (di
.last_track_msb
<< 8) | di
.last_track_lsb
;
1747 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1750 /* if this track is blank, try the previous. */
1753 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1757 /* if last recorded field is valid, return it. */
1759 *last_written
= be32_to_cpu(ti
.last_rec_address
);
1761 /* make it up instead */
1762 *last_written
= be32_to_cpu(ti
.track_start
) +
1763 be32_to_cpu(ti
.track_size
);
1765 *last_written
-= (be32_to_cpu(ti
.free_blocks
) + 7);
1771 * write mode select package based on pd->settings
1773 static noinline_for_stack
int pkt_set_write_settings(struct pktcdvd_device
*pd
)
1775 struct packet_command cgc
;
1776 struct request_sense sense
;
1777 write_param_page
*wp
;
1781 /* doesn't apply to DVD+RW or DVD-RAM */
1782 if ((pd
->mmc3_profile
== 0x1a) || (pd
->mmc3_profile
== 0x12))
1785 memset(buffer
, 0, sizeof(buffer
));
1786 init_cdrom_command(&cgc
, buffer
, sizeof(*wp
), CGC_DATA_READ
);
1788 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1789 pkt_dump_sense(&cgc
);
1793 size
= 2 + ((buffer
[0] << 8) | (buffer
[1] & 0xff));
1794 pd
->mode_offset
= (buffer
[6] << 8) | (buffer
[7] & 0xff);
1795 if (size
> sizeof(buffer
))
1796 size
= sizeof(buffer
);
1801 init_cdrom_command(&cgc
, buffer
, size
, CGC_DATA_READ
);
1803 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1804 pkt_dump_sense(&cgc
);
1809 * write page is offset header + block descriptor length
1811 wp
= (write_param_page
*) &buffer
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
1813 wp
->fp
= pd
->settings
.fp
;
1814 wp
->track_mode
= pd
->settings
.track_mode
;
1815 wp
->write_type
= pd
->settings
.write_type
;
1816 wp
->data_block_type
= pd
->settings
.block_mode
;
1818 wp
->multi_session
= 0;
1820 #ifdef PACKET_USE_LS
1825 if (wp
->data_block_type
== PACKET_BLOCK_MODE1
) {
1826 wp
->session_format
= 0;
1828 } else if (wp
->data_block_type
== PACKET_BLOCK_MODE2
) {
1829 wp
->session_format
= 0x20;
1833 memcpy(&wp
->mcn
[1], PACKET_MCN
, sizeof(wp
->mcn
) - 1);
1839 printk(DRIVER_NAME
": write mode wrong %d\n", wp
->data_block_type
);
1842 wp
->packet_size
= cpu_to_be32(pd
->settings
.size
>> 2);
1844 cgc
.buflen
= cgc
.cmd
[8] = size
;
1845 if ((ret
= pkt_mode_select(pd
, &cgc
))) {
1846 pkt_dump_sense(&cgc
);
1850 pkt_print_settings(pd
);
1855 * 1 -- we can write to this track, 0 -- we can't
1857 static int pkt_writable_track(struct pktcdvd_device
*pd
, track_information
*ti
)
1859 switch (pd
->mmc3_profile
) {
1860 case 0x1a: /* DVD+RW */
1861 case 0x12: /* DVD-RAM */
1862 /* The track is always writable on DVD+RW/DVD-RAM */
1868 if (!ti
->packet
|| !ti
->fp
)
1872 * "good" settings as per Mt Fuji.
1874 if (ti
->rt
== 0 && ti
->blank
== 0)
1877 if (ti
->rt
== 0 && ti
->blank
== 1)
1880 if (ti
->rt
== 1 && ti
->blank
== 0)
1883 printk(DRIVER_NAME
": bad state %d-%d-%d\n", ti
->rt
, ti
->blank
, ti
->packet
);
1888 * 1 -- we can write to this disc, 0 -- we can't
1890 static int pkt_writable_disc(struct pktcdvd_device
*pd
, disc_information
*di
)
1892 switch (pd
->mmc3_profile
) {
1893 case 0x0a: /* CD-RW */
1894 case 0xffff: /* MMC3 not supported */
1896 case 0x1a: /* DVD+RW */
1897 case 0x13: /* DVD-RW */
1898 case 0x12: /* DVD-RAM */
1901 VPRINTK(DRIVER_NAME
": Wrong disc profile (%x)\n", pd
->mmc3_profile
);
1906 * for disc type 0xff we should probably reserve a new track.
1907 * but i'm not sure, should we leave this to user apps? probably.
1909 if (di
->disc_type
== 0xff) {
1910 printk(DRIVER_NAME
": Unknown disc. No track?\n");
1914 if (di
->disc_type
!= 0x20 && di
->disc_type
!= 0) {
1915 printk(DRIVER_NAME
": Wrong disc type (%x)\n", di
->disc_type
);
1919 if (di
->erasable
== 0) {
1920 printk(DRIVER_NAME
": Disc not erasable\n");
1924 if (di
->border_status
== PACKET_SESSION_RESERVED
) {
1925 printk(DRIVER_NAME
": Can't write to last track (reserved)\n");
1932 static noinline_for_stack
int pkt_probe_settings(struct pktcdvd_device
*pd
)
1934 struct packet_command cgc
;
1935 unsigned char buf
[12];
1936 disc_information di
;
1937 track_information ti
;
1940 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1941 cgc
.cmd
[0] = GPCMD_GET_CONFIGURATION
;
1943 ret
= pkt_generic_packet(pd
, &cgc
);
1944 pd
->mmc3_profile
= ret
? 0xffff : buf
[6] << 8 | buf
[7];
1946 memset(&di
, 0, sizeof(disc_information
));
1947 memset(&ti
, 0, sizeof(track_information
));
1949 if ((ret
= pkt_get_disc_info(pd
, &di
))) {
1950 printk("failed get_disc\n");
1954 if (!pkt_writable_disc(pd
, &di
))
1957 pd
->type
= di
.erasable
? PACKET_CDRW
: PACKET_CDR
;
1959 track
= 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1960 if ((ret
= pkt_get_track_info(pd
, track
, 1, &ti
))) {
1961 printk(DRIVER_NAME
": failed get_track\n");
1965 if (!pkt_writable_track(pd
, &ti
)) {
1966 printk(DRIVER_NAME
": can't write to this track\n");
1971 * we keep packet size in 512 byte units, makes it easier to
1972 * deal with request calculations.
1974 pd
->settings
.size
= be32_to_cpu(ti
.fixed_packet_size
) << 2;
1975 if (pd
->settings
.size
== 0) {
1976 printk(DRIVER_NAME
": detected zero packet size!\n");
1979 if (pd
->settings
.size
> PACKET_MAX_SECTORS
) {
1980 printk(DRIVER_NAME
": packet size is too big\n");
1983 pd
->settings
.fp
= ti
.fp
;
1984 pd
->offset
= (be32_to_cpu(ti
.track_start
) << 2) & (pd
->settings
.size
- 1);
1987 pd
->nwa
= be32_to_cpu(ti
.next_writable
);
1988 set_bit(PACKET_NWA_VALID
, &pd
->flags
);
1992 * in theory we could use lra on -RW media as well and just zero
1993 * blocks that haven't been written yet, but in practice that
1994 * is just a no-go. we'll use that for -R, naturally.
1997 pd
->lra
= be32_to_cpu(ti
.last_rec_address
);
1998 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
2000 pd
->lra
= 0xffffffff;
2001 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
2007 pd
->settings
.link_loss
= 7;
2008 pd
->settings
.write_type
= 0; /* packet */
2009 pd
->settings
.track_mode
= ti
.track_mode
;
2012 * mode1 or mode2 disc
2014 switch (ti
.data_mode
) {
2016 pd
->settings
.block_mode
= PACKET_BLOCK_MODE1
;
2019 pd
->settings
.block_mode
= PACKET_BLOCK_MODE2
;
2022 printk(DRIVER_NAME
": unknown data mode\n");
2029 * enable/disable write caching on drive
2031 static noinline_for_stack
int pkt_write_caching(struct pktcdvd_device
*pd
,
2034 struct packet_command cgc
;
2035 struct request_sense sense
;
2036 unsigned char buf
[64];
2039 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
2041 cgc
.buflen
= pd
->mode_offset
+ 12;
2044 * caching mode page might not be there, so quiet this command
2048 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WCACHING_PAGE
, 0)))
2051 buf
[pd
->mode_offset
+ 10] |= (!!set
<< 2);
2053 cgc
.buflen
= cgc
.cmd
[8] = 2 + ((buf
[0] << 8) | (buf
[1] & 0xff));
2054 ret
= pkt_mode_select(pd
, &cgc
);
2056 printk(DRIVER_NAME
": write caching control failed\n");
2057 pkt_dump_sense(&cgc
);
2058 } else if (!ret
&& set
)
2059 printk(DRIVER_NAME
": enabled write caching on %s\n", pd
->name
);
2063 static int pkt_lock_door(struct pktcdvd_device
*pd
, int lockflag
)
2065 struct packet_command cgc
;
2067 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2068 cgc
.cmd
[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL
;
2069 cgc
.cmd
[4] = lockflag
? 1 : 0;
2070 return pkt_generic_packet(pd
, &cgc
);
2074 * Returns drive maximum write speed
2076 static noinline_for_stack
int pkt_get_max_speed(struct pktcdvd_device
*pd
,
2077 unsigned *write_speed
)
2079 struct packet_command cgc
;
2080 struct request_sense sense
;
2081 unsigned char buf
[256+18];
2082 unsigned char *cap_buf
;
2085 cap_buf
= &buf
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
2086 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_UNKNOWN
);
2089 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2091 cgc
.buflen
= pd
->mode_offset
+ cap_buf
[1] + 2 +
2092 sizeof(struct mode_page_header
);
2093 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2095 pkt_dump_sense(&cgc
);
2100 offset
= 20; /* Obsoleted field, used by older drives */
2101 if (cap_buf
[1] >= 28)
2102 offset
= 28; /* Current write speed selected */
2103 if (cap_buf
[1] >= 30) {
2104 /* If the drive reports at least one "Logical Unit Write
2105 * Speed Performance Descriptor Block", use the information
2106 * in the first block. (contains the highest speed)
2108 int num_spdb
= (cap_buf
[30] << 8) + cap_buf
[31];
2113 *write_speed
= (cap_buf
[offset
] << 8) | cap_buf
[offset
+ 1];
2117 /* These tables from cdrecord - I don't have orange book */
2118 /* standard speed CD-RW (1-4x) */
2119 static char clv_to_speed
[16] = {
2120 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2121 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2123 /* high speed CD-RW (-10x) */
2124 static char hs_clv_to_speed
[16] = {
2125 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2126 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2128 /* ultra high speed CD-RW */
2129 static char us_clv_to_speed
[16] = {
2130 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2131 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2135 * reads the maximum media speed from ATIP
2137 static noinline_for_stack
int pkt_media_speed(struct pktcdvd_device
*pd
,
2140 struct packet_command cgc
;
2141 struct request_sense sense
;
2142 unsigned char buf
[64];
2143 unsigned int size
, st
, sp
;
2146 init_cdrom_command(&cgc
, buf
, 2, CGC_DATA_READ
);
2148 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2150 cgc
.cmd
[2] = 4; /* READ ATIP */
2152 ret
= pkt_generic_packet(pd
, &cgc
);
2154 pkt_dump_sense(&cgc
);
2157 size
= ((unsigned int) buf
[0]<<8) + buf
[1] + 2;
2158 if (size
> sizeof(buf
))
2161 init_cdrom_command(&cgc
, buf
, size
, CGC_DATA_READ
);
2163 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2167 ret
= pkt_generic_packet(pd
, &cgc
);
2169 pkt_dump_sense(&cgc
);
2173 if (!(buf
[6] & 0x40)) {
2174 printk(DRIVER_NAME
": Disc type is not CD-RW\n");
2177 if (!(buf
[6] & 0x4)) {
2178 printk(DRIVER_NAME
": A1 values on media are not valid, maybe not CDRW?\n");
2182 st
= (buf
[6] >> 3) & 0x7; /* disc sub-type */
2184 sp
= buf
[16] & 0xf; /* max speed from ATIP A1 field */
2186 /* Info from cdrecord */
2188 case 0: /* standard speed */
2189 *speed
= clv_to_speed
[sp
];
2191 case 1: /* high speed */
2192 *speed
= hs_clv_to_speed
[sp
];
2194 case 2: /* ultra high speed */
2195 *speed
= us_clv_to_speed
[sp
];
2198 printk(DRIVER_NAME
": Unknown disc sub-type %d\n",st
);
2202 printk(DRIVER_NAME
": Max. media speed: %d\n",*speed
);
2205 printk(DRIVER_NAME
": Unknown speed %d for sub-type %d\n",sp
,st
);
2210 static noinline_for_stack
int pkt_perform_opc(struct pktcdvd_device
*pd
)
2212 struct packet_command cgc
;
2213 struct request_sense sense
;
2216 VPRINTK(DRIVER_NAME
": Performing OPC\n");
2218 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2220 cgc
.timeout
= 60*HZ
;
2221 cgc
.cmd
[0] = GPCMD_SEND_OPC
;
2223 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
2224 pkt_dump_sense(&cgc
);
2228 static int pkt_open_write(struct pktcdvd_device
*pd
)
2231 unsigned int write_speed
, media_write_speed
, read_speed
;
2233 if ((ret
= pkt_probe_settings(pd
))) {
2234 VPRINTK(DRIVER_NAME
": %s failed probe\n", pd
->name
);
2238 if ((ret
= pkt_set_write_settings(pd
))) {
2239 DPRINTK(DRIVER_NAME
": %s failed saving write settings\n", pd
->name
);
2243 pkt_write_caching(pd
, USE_WCACHING
);
2245 if ((ret
= pkt_get_max_speed(pd
, &write_speed
)))
2246 write_speed
= 16 * 177;
2247 switch (pd
->mmc3_profile
) {
2248 case 0x13: /* DVD-RW */
2249 case 0x1a: /* DVD+RW */
2250 case 0x12: /* DVD-RAM */
2251 DPRINTK(DRIVER_NAME
": write speed %ukB/s\n", write_speed
);
2254 if ((ret
= pkt_media_speed(pd
, &media_write_speed
)))
2255 media_write_speed
= 16;
2256 write_speed
= min(write_speed
, media_write_speed
* 177);
2257 DPRINTK(DRIVER_NAME
": write speed %ux\n", write_speed
/ 176);
2260 read_speed
= write_speed
;
2262 if ((ret
= pkt_set_speed(pd
, write_speed
, read_speed
))) {
2263 DPRINTK(DRIVER_NAME
": %s couldn't set write speed\n", pd
->name
);
2266 pd
->write_speed
= write_speed
;
2267 pd
->read_speed
= read_speed
;
2269 if ((ret
= pkt_perform_opc(pd
))) {
2270 DPRINTK(DRIVER_NAME
": %s Optimum Power Calibration failed\n", pd
->name
);
2277 * called at open time.
2279 static int pkt_open_dev(struct pktcdvd_device
*pd
, fmode_t write
)
2283 struct request_queue
*q
;
2286 * We need to re-open the cdrom device without O_NONBLOCK to be able
2287 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2288 * so bdget() can't fail.
2290 bdget(pd
->bdev
->bd_dev
);
2291 if ((ret
= blkdev_get(pd
->bdev
, FMODE_READ
)))
2294 if ((ret
= bd_claim(pd
->bdev
, pd
)))
2297 if ((ret
= pkt_get_last_written(pd
, &lba
))) {
2298 printk(DRIVER_NAME
": pkt_get_last_written failed\n");
2302 set_capacity(pd
->disk
, lba
<< 2);
2303 set_capacity(pd
->bdev
->bd_disk
, lba
<< 2);
2304 bd_set_size(pd
->bdev
, (loff_t
)lba
<< 11);
2306 q
= bdev_get_queue(pd
->bdev
);
2308 if ((ret
= pkt_open_write(pd
)))
2311 * Some CDRW drives can not handle writes larger than one packet,
2312 * even if the size is a multiple of the packet size.
2314 spin_lock_irq(q
->queue_lock
);
2315 blk_queue_max_hw_sectors(q
, pd
->settings
.size
);
2316 spin_unlock_irq(q
->queue_lock
);
2317 set_bit(PACKET_WRITABLE
, &pd
->flags
);
2319 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2320 clear_bit(PACKET_WRITABLE
, &pd
->flags
);
2323 if ((ret
= pkt_set_segment_merging(pd
, q
)))
2327 if (!pkt_grow_pktlist(pd
, CONFIG_CDROM_PKTCDVD_BUFFERS
)) {
2328 printk(DRIVER_NAME
": not enough memory for buffers\n");
2332 printk(DRIVER_NAME
": %lukB available on disc\n", lba
<< 1);
2338 bd_release(pd
->bdev
);
2340 blkdev_put(pd
->bdev
, FMODE_READ
);
2346 * called when the device is closed. makes sure that the device flushes
2347 * the internal cache before we close.
2349 static void pkt_release_dev(struct pktcdvd_device
*pd
, int flush
)
2351 if (flush
&& pkt_flush_cache(pd
))
2352 DPRINTK(DRIVER_NAME
": %s not flushing cache\n", pd
->name
);
2354 pkt_lock_door(pd
, 0);
2356 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2357 bd_release(pd
->bdev
);
2358 blkdev_put(pd
->bdev
, FMODE_READ
);
2360 pkt_shrink_pktlist(pd
);
2363 static struct pktcdvd_device
*pkt_find_dev_from_minor(int dev_minor
)
2365 if (dev_minor
>= MAX_WRITERS
)
2367 return pkt_devs
[dev_minor
];
2370 static int pkt_open(struct block_device
*bdev
, fmode_t mode
)
2372 struct pktcdvd_device
*pd
= NULL
;
2375 VPRINTK(DRIVER_NAME
": entering open\n");
2377 mutex_lock(&ctl_mutex
);
2378 pd
= pkt_find_dev_from_minor(MINOR(bdev
->bd_dev
));
2383 BUG_ON(pd
->refcnt
< 0);
2386 if (pd
->refcnt
> 1) {
2387 if ((mode
& FMODE_WRITE
) &&
2388 !test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2393 ret
= pkt_open_dev(pd
, mode
& FMODE_WRITE
);
2397 * needed here as well, since ext2 (among others) may change
2398 * the blocksize at mount time
2400 set_blocksize(bdev
, CD_FRAMESIZE
);
2403 mutex_unlock(&ctl_mutex
);
2409 VPRINTK(DRIVER_NAME
": failed open (%d)\n", ret
);
2410 mutex_unlock(&ctl_mutex
);
2414 static int pkt_close(struct gendisk
*disk
, fmode_t mode
)
2416 struct pktcdvd_device
*pd
= disk
->private_data
;
2419 mutex_lock(&ctl_mutex
);
2421 BUG_ON(pd
->refcnt
< 0);
2422 if (pd
->refcnt
== 0) {
2423 int flush
= test_bit(PACKET_WRITABLE
, &pd
->flags
);
2424 pkt_release_dev(pd
, flush
);
2426 mutex_unlock(&ctl_mutex
);
2431 static void pkt_end_io_read_cloned(struct bio
*bio
, int err
)
2433 struct packet_stacked_data
*psd
= bio
->bi_private
;
2434 struct pktcdvd_device
*pd
= psd
->pd
;
2437 bio_endio(psd
->bio
, err
);
2438 mempool_free(psd
, psd_pool
);
2439 pkt_bio_finished(pd
);
2442 static int pkt_make_request(struct request_queue
*q
, struct bio
*bio
)
2444 struct pktcdvd_device
*pd
;
2445 char b
[BDEVNAME_SIZE
];
2447 struct packet_data
*pkt
;
2448 int was_empty
, blocked_bio
;
2449 struct pkt_rb_node
*node
;
2453 printk(DRIVER_NAME
": %s incorrect request queue\n", bdevname(bio
->bi_bdev
, b
));
2458 * Clone READ bios so we can have our own bi_end_io callback.
2460 if (bio_data_dir(bio
) == READ
) {
2461 struct bio
*cloned_bio
= bio_clone(bio
, GFP_NOIO
);
2462 struct packet_stacked_data
*psd
= mempool_alloc(psd_pool
, GFP_NOIO
);
2466 cloned_bio
->bi_bdev
= pd
->bdev
;
2467 cloned_bio
->bi_private
= psd
;
2468 cloned_bio
->bi_end_io
= pkt_end_io_read_cloned
;
2469 pd
->stats
.secs_r
+= bio
->bi_size
>> 9;
2470 pkt_queue_bio(pd
, cloned_bio
);
2474 if (!test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2475 printk(DRIVER_NAME
": WRITE for ro device %s (%llu)\n",
2476 pd
->name
, (unsigned long long)bio
->bi_sector
);
2480 if (!bio
->bi_size
|| (bio
->bi_size
% CD_FRAMESIZE
)) {
2481 printk(DRIVER_NAME
": wrong bio size\n");
2485 blk_queue_bounce(q
, &bio
);
2487 zone
= ZONE(bio
->bi_sector
, pd
);
2488 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2489 (unsigned long long)bio
->bi_sector
,
2490 (unsigned long long)(bio
->bi_sector
+ bio_sectors(bio
)));
2492 /* Check if we have to split the bio */
2494 struct bio_pair
*bp
;
2498 last_zone
= ZONE(bio
->bi_sector
+ bio_sectors(bio
) - 1, pd
);
2499 if (last_zone
!= zone
) {
2500 BUG_ON(last_zone
!= zone
+ pd
->settings
.size
);
2501 first_sectors
= last_zone
- bio
->bi_sector
;
2502 bp
= bio_split(bio
, first_sectors
);
2504 pkt_make_request(q
, &bp
->bio1
);
2505 pkt_make_request(q
, &bp
->bio2
);
2506 bio_pair_release(bp
);
2512 * If we find a matching packet in state WAITING or READ_WAIT, we can
2513 * just append this bio to that packet.
2515 spin_lock(&pd
->cdrw
.active_list_lock
);
2517 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
2518 if (pkt
->sector
== zone
) {
2519 spin_lock(&pkt
->lock
);
2520 if ((pkt
->state
== PACKET_WAITING_STATE
) ||
2521 (pkt
->state
== PACKET_READ_WAIT_STATE
)) {
2522 bio_list_add(&pkt
->orig_bios
, bio
);
2523 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
2524 if ((pkt
->write_size
>= pkt
->frames
) &&
2525 (pkt
->state
== PACKET_WAITING_STATE
)) {
2526 atomic_inc(&pkt
->run_sm
);
2527 wake_up(&pd
->wqueue
);
2529 spin_unlock(&pkt
->lock
);
2530 spin_unlock(&pd
->cdrw
.active_list_lock
);
2535 spin_unlock(&pkt
->lock
);
2538 spin_unlock(&pd
->cdrw
.active_list_lock
);
2541 * Test if there is enough room left in the bio work queue
2542 * (queue size >= congestion on mark).
2543 * If not, wait till the work queue size is below the congestion off mark.
2545 spin_lock(&pd
->lock
);
2546 if (pd
->write_congestion_on
> 0
2547 && pd
->bio_queue_size
>= pd
->write_congestion_on
) {
2548 set_bdi_congested(&q
->backing_dev_info
, BLK_RW_ASYNC
);
2550 spin_unlock(&pd
->lock
);
2551 congestion_wait(BLK_RW_ASYNC
, HZ
);
2552 spin_lock(&pd
->lock
);
2553 } while(pd
->bio_queue_size
> pd
->write_congestion_off
);
2555 spin_unlock(&pd
->lock
);
2558 * No matching packet found. Store the bio in the work queue.
2560 node
= mempool_alloc(pd
->rb_pool
, GFP_NOIO
);
2562 spin_lock(&pd
->lock
);
2563 BUG_ON(pd
->bio_queue_size
< 0);
2564 was_empty
= (pd
->bio_queue_size
== 0);
2565 pkt_rbtree_insert(pd
, node
);
2566 spin_unlock(&pd
->lock
);
2569 * Wake up the worker thread.
2571 atomic_set(&pd
->scan_queue
, 1);
2573 /* This wake_up is required for correct operation */
2574 wake_up(&pd
->wqueue
);
2575 } else if (!list_empty(&pd
->cdrw
.pkt_free_list
) && !blocked_bio
) {
2577 * This wake up is not required for correct operation,
2578 * but improves performance in some cases.
2580 wake_up(&pd
->wqueue
);
2590 static int pkt_merge_bvec(struct request_queue
*q
, struct bvec_merge_data
*bmd
,
2591 struct bio_vec
*bvec
)
2593 struct pktcdvd_device
*pd
= q
->queuedata
;
2594 sector_t zone
= ZONE(bmd
->bi_sector
, pd
);
2595 int used
= ((bmd
->bi_sector
- zone
) << 9) + bmd
->bi_size
;
2596 int remaining
= (pd
->settings
.size
<< 9) - used
;
2600 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2601 * boundary, pkt_make_request() will split the bio.
2603 remaining2
= PAGE_SIZE
- bmd
->bi_size
;
2604 remaining
= max(remaining
, remaining2
);
2606 BUG_ON(remaining
< 0);
2610 static void pkt_init_queue(struct pktcdvd_device
*pd
)
2612 struct request_queue
*q
= pd
->disk
->queue
;
2614 blk_queue_make_request(q
, pkt_make_request
);
2615 blk_queue_logical_block_size(q
, CD_FRAMESIZE
);
2616 blk_queue_max_hw_sectors(q
, PACKET_MAX_SECTORS
);
2617 blk_queue_merge_bvec(q
, pkt_merge_bvec
);
2621 static int pkt_seq_show(struct seq_file
*m
, void *p
)
2623 struct pktcdvd_device
*pd
= m
->private;
2625 char bdev_buf
[BDEVNAME_SIZE
];
2626 int states
[PACKET_NUM_STATES
];
2628 seq_printf(m
, "Writer %s mapped to %s:\n", pd
->name
,
2629 bdevname(pd
->bdev
, bdev_buf
));
2631 seq_printf(m
, "\nSettings:\n");
2632 seq_printf(m
, "\tpacket size:\t\t%dkB\n", pd
->settings
.size
/ 2);
2634 if (pd
->settings
.write_type
== 0)
2638 seq_printf(m
, "\twrite type:\t\t%s\n", msg
);
2640 seq_printf(m
, "\tpacket type:\t\t%s\n", pd
->settings
.fp
? "Fixed" : "Variable");
2641 seq_printf(m
, "\tlink loss:\t\t%d\n", pd
->settings
.link_loss
);
2643 seq_printf(m
, "\ttrack mode:\t\t%d\n", pd
->settings
.track_mode
);
2645 if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE1
)
2647 else if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE2
)
2651 seq_printf(m
, "\tblock mode:\t\t%s\n", msg
);
2653 seq_printf(m
, "\nStatistics:\n");
2654 seq_printf(m
, "\tpackets started:\t%lu\n", pd
->stats
.pkt_started
);
2655 seq_printf(m
, "\tpackets ended:\t\t%lu\n", pd
->stats
.pkt_ended
);
2656 seq_printf(m
, "\twritten:\t\t%lukB\n", pd
->stats
.secs_w
>> 1);
2657 seq_printf(m
, "\tread gather:\t\t%lukB\n", pd
->stats
.secs_rg
>> 1);
2658 seq_printf(m
, "\tread:\t\t\t%lukB\n", pd
->stats
.secs_r
>> 1);
2660 seq_printf(m
, "\nMisc:\n");
2661 seq_printf(m
, "\treference count:\t%d\n", pd
->refcnt
);
2662 seq_printf(m
, "\tflags:\t\t\t0x%lx\n", pd
->flags
);
2663 seq_printf(m
, "\tread speed:\t\t%ukB/s\n", pd
->read_speed
);
2664 seq_printf(m
, "\twrite speed:\t\t%ukB/s\n", pd
->write_speed
);
2665 seq_printf(m
, "\tstart offset:\t\t%lu\n", pd
->offset
);
2666 seq_printf(m
, "\tmode page offset:\t%u\n", pd
->mode_offset
);
2668 seq_printf(m
, "\nQueue state:\n");
2669 seq_printf(m
, "\tbios queued:\t\t%d\n", pd
->bio_queue_size
);
2670 seq_printf(m
, "\tbios pending:\t\t%d\n", atomic_read(&pd
->cdrw
.pending_bios
));
2671 seq_printf(m
, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd
->current_sector
);
2673 pkt_count_states(pd
, states
);
2674 seq_printf(m
, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2675 states
[0], states
[1], states
[2], states
[3], states
[4], states
[5]);
2677 seq_printf(m
, "\twrite congestion marks:\toff=%d on=%d\n",
2678 pd
->write_congestion_off
,
2679 pd
->write_congestion_on
);
2683 static int pkt_seq_open(struct inode
*inode
, struct file
*file
)
2685 return single_open(file
, pkt_seq_show
, PDE(inode
)->data
);
2688 static const struct file_operations pkt_proc_fops
= {
2689 .open
= pkt_seq_open
,
2691 .llseek
= seq_lseek
,
2692 .release
= single_release
2695 static int pkt_new_dev(struct pktcdvd_device
*pd
, dev_t dev
)
2699 char b
[BDEVNAME_SIZE
];
2700 struct block_device
*bdev
;
2702 if (pd
->pkt_dev
== dev
) {
2703 printk(DRIVER_NAME
": Recursive setup not allowed\n");
2706 for (i
= 0; i
< MAX_WRITERS
; i
++) {
2707 struct pktcdvd_device
*pd2
= pkt_devs
[i
];
2710 if (pd2
->bdev
->bd_dev
== dev
) {
2711 printk(DRIVER_NAME
": %s already setup\n", bdevname(pd2
->bdev
, b
));
2714 if (pd2
->pkt_dev
== dev
) {
2715 printk(DRIVER_NAME
": Can't chain pktcdvd devices\n");
2723 ret
= blkdev_get(bdev
, FMODE_READ
| FMODE_NDELAY
);
2727 /* This is safe, since we have a reference from open(). */
2728 __module_get(THIS_MODULE
);
2731 set_blocksize(bdev
, CD_FRAMESIZE
);
2735 atomic_set(&pd
->cdrw
.pending_bios
, 0);
2736 pd
->cdrw
.thread
= kthread_run(kcdrwd
, pd
, "%s", pd
->name
);
2737 if (IS_ERR(pd
->cdrw
.thread
)) {
2738 printk(DRIVER_NAME
": can't start kernel thread\n");
2743 proc_create_data(pd
->name
, 0, pkt_proc
, &pkt_proc_fops
, pd
);
2744 DPRINTK(DRIVER_NAME
": writer %s mapped to %s\n", pd
->name
, bdevname(bdev
, b
));
2748 blkdev_put(bdev
, FMODE_READ
| FMODE_NDELAY
);
2749 /* This is safe: open() is still holding a reference. */
2750 module_put(THIS_MODULE
);
2754 static int pkt_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
, unsigned long arg
)
2756 struct pktcdvd_device
*pd
= bdev
->bd_disk
->private_data
;
2758 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd
,
2759 MAJOR(bdev
->bd_dev
), MINOR(bdev
->bd_dev
));
2764 * The door gets locked when the device is opened, so we
2765 * have to unlock it or else the eject command fails.
2767 if (pd
->refcnt
== 1)
2768 pkt_lock_door(pd
, 0);
2771 * forward selected CDROM ioctls to CD-ROM, for UDF
2773 case CDROMMULTISESSION
:
2774 case CDROMREADTOCENTRY
:
2775 case CDROM_LAST_WRITTEN
:
2776 case CDROM_SEND_PACKET
:
2777 case SCSI_IOCTL_SEND_COMMAND
:
2778 return __blkdev_driver_ioctl(pd
->bdev
, mode
, cmd
, arg
);
2781 VPRINTK(DRIVER_NAME
": Unknown ioctl for %s (%x)\n", pd
->name
, cmd
);
2788 static int pkt_media_changed(struct gendisk
*disk
)
2790 struct pktcdvd_device
*pd
= disk
->private_data
;
2791 struct gendisk
*attached_disk
;
2797 attached_disk
= pd
->bdev
->bd_disk
;
2800 return attached_disk
->fops
->media_changed(attached_disk
);
2803 static const struct block_device_operations pktcdvd_ops
= {
2804 .owner
= THIS_MODULE
,
2806 .release
= pkt_close
,
2807 .locked_ioctl
= pkt_ioctl
,
2808 .media_changed
= pkt_media_changed
,
2811 static char *pktcdvd_devnode(struct gendisk
*gd
, mode_t
*mode
)
2813 return kasprintf(GFP_KERNEL
, "pktcdvd/%s", gd
->disk_name
);
2817 * Set up mapping from pktcdvd device to CD-ROM device.
2819 static int pkt_setup_dev(dev_t dev
, dev_t
* pkt_dev
)
2823 struct pktcdvd_device
*pd
;
2824 struct gendisk
*disk
;
2826 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2828 for (idx
= 0; idx
< MAX_WRITERS
; idx
++)
2831 if (idx
== MAX_WRITERS
) {
2832 printk(DRIVER_NAME
": max %d writers supported\n", MAX_WRITERS
);
2837 pd
= kzalloc(sizeof(struct pktcdvd_device
), GFP_KERNEL
);
2841 pd
->rb_pool
= mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE
,
2842 sizeof(struct pkt_rb_node
));
2846 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
2847 INIT_LIST_HEAD(&pd
->cdrw
.pkt_active_list
);
2848 spin_lock_init(&pd
->cdrw
.active_list_lock
);
2850 spin_lock_init(&pd
->lock
);
2851 spin_lock_init(&pd
->iosched
.lock
);
2852 bio_list_init(&pd
->iosched
.read_queue
);
2853 bio_list_init(&pd
->iosched
.write_queue
);
2854 sprintf(pd
->name
, DRIVER_NAME
"%d", idx
);
2855 init_waitqueue_head(&pd
->wqueue
);
2856 pd
->bio_queue
= RB_ROOT
;
2858 pd
->write_congestion_on
= write_congestion_on
;
2859 pd
->write_congestion_off
= write_congestion_off
;
2861 disk
= alloc_disk(1);
2865 disk
->major
= pktdev_major
;
2866 disk
->first_minor
= idx
;
2867 disk
->fops
= &pktcdvd_ops
;
2868 disk
->flags
= GENHD_FL_REMOVABLE
;
2869 strcpy(disk
->disk_name
, pd
->name
);
2870 disk
->devnode
= pktcdvd_devnode
;
2871 disk
->private_data
= pd
;
2872 disk
->queue
= blk_alloc_queue(GFP_KERNEL
);
2876 pd
->pkt_dev
= MKDEV(pktdev_major
, idx
);
2877 ret
= pkt_new_dev(pd
, dev
);
2883 pkt_sysfs_dev_new(pd
);
2884 pkt_debugfs_dev_new(pd
);
2888 *pkt_dev
= pd
->pkt_dev
;
2890 mutex_unlock(&ctl_mutex
);
2894 blk_cleanup_queue(disk
->queue
);
2899 mempool_destroy(pd
->rb_pool
);
2902 mutex_unlock(&ctl_mutex
);
2903 printk(DRIVER_NAME
": setup of pktcdvd device failed\n");
2908 * Tear down mapping from pktcdvd device to CD-ROM device.
2910 static int pkt_remove_dev(dev_t pkt_dev
)
2912 struct pktcdvd_device
*pd
;
2916 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2918 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
2920 if (pd
&& (pd
->pkt_dev
== pkt_dev
))
2923 if (idx
== MAX_WRITERS
) {
2924 DPRINTK(DRIVER_NAME
": dev not setup\n");
2929 if (pd
->refcnt
> 0) {
2933 if (!IS_ERR(pd
->cdrw
.thread
))
2934 kthread_stop(pd
->cdrw
.thread
);
2936 pkt_devs
[idx
] = NULL
;
2938 pkt_debugfs_dev_remove(pd
);
2939 pkt_sysfs_dev_remove(pd
);
2941 blkdev_put(pd
->bdev
, FMODE_READ
| FMODE_NDELAY
);
2943 remove_proc_entry(pd
->name
, pkt_proc
);
2944 DPRINTK(DRIVER_NAME
": writer %s unmapped\n", pd
->name
);
2946 del_gendisk(pd
->disk
);
2947 blk_cleanup_queue(pd
->disk
->queue
);
2950 mempool_destroy(pd
->rb_pool
);
2953 /* This is safe: open() is still holding a reference. */
2954 module_put(THIS_MODULE
);
2957 mutex_unlock(&ctl_mutex
);
2961 static void pkt_get_status(struct pkt_ctrl_command
*ctrl_cmd
)
2963 struct pktcdvd_device
*pd
;
2965 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2967 pd
= pkt_find_dev_from_minor(ctrl_cmd
->dev_index
);
2969 ctrl_cmd
->dev
= new_encode_dev(pd
->bdev
->bd_dev
);
2970 ctrl_cmd
->pkt_dev
= new_encode_dev(pd
->pkt_dev
);
2973 ctrl_cmd
->pkt_dev
= 0;
2975 ctrl_cmd
->num_devices
= MAX_WRITERS
;
2977 mutex_unlock(&ctl_mutex
);
2980 static int pkt_ctl_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
2982 void __user
*argp
= (void __user
*)arg
;
2983 struct pkt_ctrl_command ctrl_cmd
;
2987 if (cmd
!= PACKET_CTRL_CMD
)
2990 if (copy_from_user(&ctrl_cmd
, argp
, sizeof(struct pkt_ctrl_command
)))
2993 switch (ctrl_cmd
.command
) {
2994 case PKT_CTRL_CMD_SETUP
:
2995 if (!capable(CAP_SYS_ADMIN
))
2997 ret
= pkt_setup_dev(new_decode_dev(ctrl_cmd
.dev
), &pkt_dev
);
2998 ctrl_cmd
.pkt_dev
= new_encode_dev(pkt_dev
);
3000 case PKT_CTRL_CMD_TEARDOWN
:
3001 if (!capable(CAP_SYS_ADMIN
))
3003 ret
= pkt_remove_dev(new_decode_dev(ctrl_cmd
.pkt_dev
));
3005 case PKT_CTRL_CMD_STATUS
:
3006 pkt_get_status(&ctrl_cmd
);
3012 if (copy_to_user(argp
, &ctrl_cmd
, sizeof(struct pkt_ctrl_command
)))
3018 static const struct file_operations pkt_ctl_fops
= {
3019 .ioctl
= pkt_ctl_ioctl
,
3020 .owner
= THIS_MODULE
,
3023 static struct miscdevice pkt_misc
= {
3024 .minor
= MISC_DYNAMIC_MINOR
,
3025 .name
= DRIVER_NAME
,
3026 .nodename
= "pktcdvd/control",
3027 .fops
= &pkt_ctl_fops
3030 static int __init
pkt_init(void)
3034 mutex_init(&ctl_mutex
);
3036 psd_pool
= mempool_create_kmalloc_pool(PSD_POOL_SIZE
,
3037 sizeof(struct packet_stacked_data
));
3041 ret
= register_blkdev(pktdev_major
, DRIVER_NAME
);
3043 printk(DRIVER_NAME
": Unable to register block device\n");
3049 ret
= pkt_sysfs_init();
3055 ret
= misc_register(&pkt_misc
);
3057 printk(DRIVER_NAME
": Unable to register misc device\n");
3061 pkt_proc
= proc_mkdir("driver/"DRIVER_NAME
, NULL
);
3066 pkt_debugfs_cleanup();
3067 pkt_sysfs_cleanup();
3069 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3071 mempool_destroy(psd_pool
);
3075 static void __exit
pkt_exit(void)
3077 remove_proc_entry("driver/"DRIVER_NAME
, NULL
);
3078 misc_deregister(&pkt_misc
);
3080 pkt_debugfs_cleanup();
3081 pkt_sysfs_cleanup();
3083 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3084 mempool_destroy(psd_pool
);
3087 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3088 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3089 MODULE_LICENSE("GPL");
3091 module_init(pkt_init
);
3092 module_exit(pkt_exit
);