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
; /* /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_destroy(class_pktcdvd
, pd
->pkt_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 /debugfs/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
);
573 for (i
= 0; i
< frames
; i
++) {
574 struct bio
*bio
= pkt_bio_alloc(1);
577 pkt
->r_bios
[i
] = bio
;
583 for (i
= 0; i
< frames
; i
++) {
584 struct bio
*bio
= pkt
->r_bios
[i
];
590 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++)
592 __free_page(pkt
->pages
[i
]);
601 * Free a packet_data struct
603 static void pkt_free_packet_data(struct packet_data
*pkt
)
607 for (i
= 0; i
< pkt
->frames
; i
++) {
608 struct bio
*bio
= pkt
->r_bios
[i
];
612 for (i
= 0; i
< pkt
->frames
/ FRAMES_PER_PAGE
; i
++)
613 __free_page(pkt
->pages
[i
]);
618 static void pkt_shrink_pktlist(struct pktcdvd_device
*pd
)
620 struct packet_data
*pkt
, *next
;
622 BUG_ON(!list_empty(&pd
->cdrw
.pkt_active_list
));
624 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_free_list
, list
) {
625 pkt_free_packet_data(pkt
);
627 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
630 static int pkt_grow_pktlist(struct pktcdvd_device
*pd
, int nr_packets
)
632 struct packet_data
*pkt
;
634 BUG_ON(!list_empty(&pd
->cdrw
.pkt_free_list
));
636 while (nr_packets
> 0) {
637 pkt
= pkt_alloc_packet_data(pd
->settings
.size
>> 2);
639 pkt_shrink_pktlist(pd
);
642 pkt
->id
= nr_packets
;
644 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
650 static inline struct pkt_rb_node
*pkt_rbtree_next(struct pkt_rb_node
*node
)
652 struct rb_node
*n
= rb_next(&node
->rb_node
);
655 return rb_entry(n
, struct pkt_rb_node
, rb_node
);
658 static void pkt_rbtree_erase(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
660 rb_erase(&node
->rb_node
, &pd
->bio_queue
);
661 mempool_free(node
, pd
->rb_pool
);
662 pd
->bio_queue_size
--;
663 BUG_ON(pd
->bio_queue_size
< 0);
667 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
669 static struct pkt_rb_node
*pkt_rbtree_find(struct pktcdvd_device
*pd
, sector_t s
)
671 struct rb_node
*n
= pd
->bio_queue
.rb_node
;
672 struct rb_node
*next
;
673 struct pkt_rb_node
*tmp
;
676 BUG_ON(pd
->bio_queue_size
> 0);
681 tmp
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
682 if (s
<= tmp
->bio
->bi_sector
)
691 if (s
> tmp
->bio
->bi_sector
) {
692 tmp
= pkt_rbtree_next(tmp
);
696 BUG_ON(s
> tmp
->bio
->bi_sector
);
701 * Insert a node into the pd->bio_queue rb tree.
703 static void pkt_rbtree_insert(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
705 struct rb_node
**p
= &pd
->bio_queue
.rb_node
;
706 struct rb_node
*parent
= NULL
;
707 sector_t s
= node
->bio
->bi_sector
;
708 struct pkt_rb_node
*tmp
;
712 tmp
= rb_entry(parent
, struct pkt_rb_node
, rb_node
);
713 if (s
< tmp
->bio
->bi_sector
)
718 rb_link_node(&node
->rb_node
, parent
, p
);
719 rb_insert_color(&node
->rb_node
, &pd
->bio_queue
);
720 pd
->bio_queue_size
++;
724 * Add a bio to a single linked list defined by its head and tail pointers.
726 static void pkt_add_list_last(struct bio
*bio
, struct bio
**list_head
, struct bio
**list_tail
)
730 BUG_ON((*list_head
) == NULL
);
731 (*list_tail
)->bi_next
= bio
;
734 BUG_ON((*list_head
) != NULL
);
741 * Remove and return the first bio from a single linked list defined by its
742 * head and tail pointers.
744 static inline struct bio
*pkt_get_list_first(struct bio
**list_head
, struct bio
**list_tail
)
748 if (*list_head
== NULL
)
752 *list_head
= bio
->bi_next
;
753 if (*list_head
== NULL
)
761 * Send a packet_command to the underlying block device and
762 * wait for completion.
764 static int pkt_generic_packet(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
766 struct request_queue
*q
= bdev_get_queue(pd
->bdev
);
770 rq
= blk_get_request(q
, (cgc
->data_direction
== CGC_DATA_WRITE
) ?
771 WRITE
: READ
, __GFP_WAIT
);
774 if (blk_rq_map_kern(q
, rq
, cgc
->buffer
, cgc
->buflen
, __GFP_WAIT
))
778 rq
->cmd_len
= COMMAND_SIZE(cgc
->cmd
[0]);
779 memcpy(rq
->cmd
, cgc
->cmd
, CDROM_PACKET_SIZE
);
782 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
783 rq
->cmd_flags
|= REQ_HARDBARRIER
;
785 rq
->cmd_flags
|= REQ_QUIET
;
787 blk_execute_rq(rq
->q
, pd
->bdev
->bd_disk
, rq
, 0);
796 * A generic sense dump / resolve mechanism should be implemented across
797 * all ATAPI + SCSI devices.
799 static void pkt_dump_sense(struct packet_command
*cgc
)
801 static char *info
[9] = { "No sense", "Recovered error", "Not ready",
802 "Medium error", "Hardware error", "Illegal request",
803 "Unit attention", "Data protect", "Blank check" };
805 struct request_sense
*sense
= cgc
->sense
;
807 printk(DRIVER_NAME
":");
808 for (i
= 0; i
< CDROM_PACKET_SIZE
; i
++)
809 printk(" %02x", cgc
->cmd
[i
]);
813 printk("no sense\n");
817 printk("sense %02x.%02x.%02x", sense
->sense_key
, sense
->asc
, sense
->ascq
);
819 if (sense
->sense_key
> 8) {
820 printk(" (INVALID)\n");
824 printk(" (%s)\n", info
[sense
->sense_key
]);
828 * flush the drive cache to media
830 static int pkt_flush_cache(struct pktcdvd_device
*pd
)
832 struct packet_command cgc
;
834 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
835 cgc
.cmd
[0] = GPCMD_FLUSH_CACHE
;
839 * the IMMED bit -- we default to not setting it, although that
840 * would allow a much faster close, this is safer
845 return pkt_generic_packet(pd
, &cgc
);
849 * speed is given as the normal factor, e.g. 4 for 4x
851 static noinline_for_stack
int pkt_set_speed(struct pktcdvd_device
*pd
,
852 unsigned write_speed
, unsigned read_speed
)
854 struct packet_command cgc
;
855 struct request_sense sense
;
858 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
860 cgc
.cmd
[0] = GPCMD_SET_SPEED
;
861 cgc
.cmd
[2] = (read_speed
>> 8) & 0xff;
862 cgc
.cmd
[3] = read_speed
& 0xff;
863 cgc
.cmd
[4] = (write_speed
>> 8) & 0xff;
864 cgc
.cmd
[5] = write_speed
& 0xff;
866 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
867 pkt_dump_sense(&cgc
);
873 * Queue a bio for processing by the low-level CD device. Must be called
874 * from process context.
876 static void pkt_queue_bio(struct pktcdvd_device
*pd
, struct bio
*bio
)
878 spin_lock(&pd
->iosched
.lock
);
879 if (bio_data_dir(bio
) == READ
) {
880 pkt_add_list_last(bio
, &pd
->iosched
.read_queue
,
881 &pd
->iosched
.read_queue_tail
);
883 pkt_add_list_last(bio
, &pd
->iosched
.write_queue
,
884 &pd
->iosched
.write_queue_tail
);
886 spin_unlock(&pd
->iosched
.lock
);
888 atomic_set(&pd
->iosched
.attention
, 1);
889 wake_up(&pd
->wqueue
);
893 * Process the queued read/write requests. This function handles special
894 * requirements for CDRW drives:
895 * - A cache flush command must be inserted before a read request if the
896 * previous request was a write.
897 * - Switching between reading and writing is slow, so don't do it more often
899 * - Optimize for throughput at the expense of latency. This means that streaming
900 * writes will never be interrupted by a read, but if the drive has to seek
901 * before the next write, switch to reading instead if there are any pending
903 * - Set the read speed according to current usage pattern. When only reading
904 * from the device, it's best to use the highest possible read speed, but
905 * when switching often between reading and writing, it's better to have the
906 * same read and write speeds.
908 static void pkt_iosched_process_queue(struct pktcdvd_device
*pd
)
911 if (atomic_read(&pd
->iosched
.attention
) == 0)
913 atomic_set(&pd
->iosched
.attention
, 0);
917 int reads_queued
, writes_queued
;
919 spin_lock(&pd
->iosched
.lock
);
920 reads_queued
= (pd
->iosched
.read_queue
!= NULL
);
921 writes_queued
= (pd
->iosched
.write_queue
!= NULL
);
922 spin_unlock(&pd
->iosched
.lock
);
924 if (!reads_queued
&& !writes_queued
)
927 if (pd
->iosched
.writing
) {
928 int need_write_seek
= 1;
929 spin_lock(&pd
->iosched
.lock
);
930 bio
= pd
->iosched
.write_queue
;
931 spin_unlock(&pd
->iosched
.lock
);
932 if (bio
&& (bio
->bi_sector
== pd
->iosched
.last_write
))
934 if (need_write_seek
&& reads_queued
) {
935 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
936 VPRINTK(DRIVER_NAME
": write, waiting\n");
940 pd
->iosched
.writing
= 0;
943 if (!reads_queued
&& writes_queued
) {
944 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
945 VPRINTK(DRIVER_NAME
": read, waiting\n");
948 pd
->iosched
.writing
= 1;
952 spin_lock(&pd
->iosched
.lock
);
953 if (pd
->iosched
.writing
) {
954 bio
= pkt_get_list_first(&pd
->iosched
.write_queue
,
955 &pd
->iosched
.write_queue_tail
);
957 bio
= pkt_get_list_first(&pd
->iosched
.read_queue
,
958 &pd
->iosched
.read_queue_tail
);
960 spin_unlock(&pd
->iosched
.lock
);
965 if (bio_data_dir(bio
) == READ
)
966 pd
->iosched
.successive_reads
+= bio
->bi_size
>> 10;
968 pd
->iosched
.successive_reads
= 0;
969 pd
->iosched
.last_write
= bio
->bi_sector
+ bio_sectors(bio
);
971 if (pd
->iosched
.successive_reads
>= HI_SPEED_SWITCH
) {
972 if (pd
->read_speed
== pd
->write_speed
) {
973 pd
->read_speed
= MAX_SPEED
;
974 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
977 if (pd
->read_speed
!= pd
->write_speed
) {
978 pd
->read_speed
= pd
->write_speed
;
979 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
983 atomic_inc(&pd
->cdrw
.pending_bios
);
984 generic_make_request(bio
);
989 * Special care is needed if the underlying block device has a small
990 * max_phys_segments value.
992 static int pkt_set_segment_merging(struct pktcdvd_device
*pd
, struct request_queue
*q
)
994 if ((pd
->settings
.size
<< 9) / CD_FRAMESIZE
995 <= queue_max_phys_segments(q
)) {
997 * The cdrom device can handle one segment/frame
999 clear_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
1001 } else if ((pd
->settings
.size
<< 9) / PAGE_SIZE
1002 <= queue_max_phys_segments(q
)) {
1004 * We can handle this case at the expense of some extra memory
1005 * copies during write operations
1007 set_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
1010 printk(DRIVER_NAME
": cdrom max_phys_segments too small\n");
1016 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
1018 static void pkt_copy_bio_data(struct bio
*src_bio
, int seg
, int offs
, struct page
*dst_page
, int dst_offs
)
1020 unsigned int copy_size
= CD_FRAMESIZE
;
1022 while (copy_size
> 0) {
1023 struct bio_vec
*src_bvl
= bio_iovec_idx(src_bio
, seg
);
1024 void *vfrom
= kmap_atomic(src_bvl
->bv_page
, KM_USER0
) +
1025 src_bvl
->bv_offset
+ offs
;
1026 void *vto
= page_address(dst_page
) + dst_offs
;
1027 int len
= min_t(int, copy_size
, src_bvl
->bv_len
- offs
);
1030 memcpy(vto
, vfrom
, len
);
1031 kunmap_atomic(vfrom
, KM_USER0
);
1041 * Copy all data for this packet to pkt->pages[], so that
1042 * a) The number of required segments for the write bio is minimized, which
1043 * is necessary for some scsi controllers.
1044 * b) The data can be used as cache to avoid read requests if we receive a
1045 * new write request for the same zone.
1047 static void pkt_make_local_copy(struct packet_data
*pkt
, struct bio_vec
*bvec
)
1051 /* Copy all data to pkt->pages[] */
1054 for (f
= 0; f
< pkt
->frames
; f
++) {
1055 if (bvec
[f
].bv_page
!= pkt
->pages
[p
]) {
1056 void *vfrom
= kmap_atomic(bvec
[f
].bv_page
, KM_USER0
) + bvec
[f
].bv_offset
;
1057 void *vto
= page_address(pkt
->pages
[p
]) + offs
;
1058 memcpy(vto
, vfrom
, CD_FRAMESIZE
);
1059 kunmap_atomic(vfrom
, KM_USER0
);
1060 bvec
[f
].bv_page
= pkt
->pages
[p
];
1061 bvec
[f
].bv_offset
= offs
;
1063 BUG_ON(bvec
[f
].bv_offset
!= offs
);
1065 offs
+= CD_FRAMESIZE
;
1066 if (offs
>= PAGE_SIZE
) {
1073 static void pkt_end_io_read(struct bio
*bio
, int err
)
1075 struct packet_data
*pkt
= bio
->bi_private
;
1076 struct pktcdvd_device
*pd
= pkt
->pd
;
1079 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio
,
1080 (unsigned long long)pkt
->sector
, (unsigned long long)bio
->bi_sector
, err
);
1083 atomic_inc(&pkt
->io_errors
);
1084 if (atomic_dec_and_test(&pkt
->io_wait
)) {
1085 atomic_inc(&pkt
->run_sm
);
1086 wake_up(&pd
->wqueue
);
1088 pkt_bio_finished(pd
);
1091 static void pkt_end_io_packet_write(struct bio
*bio
, int err
)
1093 struct packet_data
*pkt
= bio
->bi_private
;
1094 struct pktcdvd_device
*pd
= pkt
->pd
;
1097 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt
->id
, err
);
1099 pd
->stats
.pkt_ended
++;
1101 pkt_bio_finished(pd
);
1102 atomic_dec(&pkt
->io_wait
);
1103 atomic_inc(&pkt
->run_sm
);
1104 wake_up(&pd
->wqueue
);
1108 * Schedule reads for the holes in a packet
1110 static void pkt_gather_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1112 int frames_read
= 0;
1115 char written
[PACKET_MAX_SIZE
];
1117 BUG_ON(!pkt
->orig_bios
);
1119 atomic_set(&pkt
->io_wait
, 0);
1120 atomic_set(&pkt
->io_errors
, 0);
1123 * Figure out which frames we need to read before we can write.
1125 memset(written
, 0, sizeof(written
));
1126 spin_lock(&pkt
->lock
);
1127 for (bio
= pkt
->orig_bios
; bio
; bio
= bio
->bi_next
) {
1128 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1129 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1130 pd
->stats
.secs_w
+= num_frames
* (CD_FRAMESIZE
>> 9);
1131 BUG_ON(first_frame
< 0);
1132 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1133 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++)
1136 spin_unlock(&pkt
->lock
);
1138 if (pkt
->cache_valid
) {
1139 VPRINTK("pkt_gather_data: zone %llx cached\n",
1140 (unsigned long long)pkt
->sector
);
1145 * Schedule reads for missing parts of the packet.
1147 for (f
= 0; f
< pkt
->frames
; f
++) {
1148 struct bio_vec
*vec
;
1153 bio
= pkt
->r_bios
[f
];
1154 vec
= bio
->bi_io_vec
;
1156 bio
->bi_max_vecs
= 1;
1157 bio
->bi_sector
= pkt
->sector
+ f
* (CD_FRAMESIZE
>> 9);
1158 bio
->bi_bdev
= pd
->bdev
;
1159 bio
->bi_end_io
= pkt_end_io_read
;
1160 bio
->bi_private
= pkt
;
1161 bio
->bi_io_vec
= vec
;
1162 bio
->bi_destructor
= pkt_bio_destructor
;
1164 p
= (f
* CD_FRAMESIZE
) / PAGE_SIZE
;
1165 offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1166 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1167 f
, pkt
->pages
[p
], offset
);
1168 if (!bio_add_page(bio
, pkt
->pages
[p
], CD_FRAMESIZE
, offset
))
1171 atomic_inc(&pkt
->io_wait
);
1173 pkt_queue_bio(pd
, bio
);
1178 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1179 frames_read
, (unsigned long long)pkt
->sector
);
1180 pd
->stats
.pkt_started
++;
1181 pd
->stats
.secs_rg
+= frames_read
* (CD_FRAMESIZE
>> 9);
1185 * Find a packet matching zone, or the least recently used packet if
1186 * there is no match.
1188 static struct packet_data
*pkt_get_packet_data(struct pktcdvd_device
*pd
, int zone
)
1190 struct packet_data
*pkt
;
1192 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_free_list
, list
) {
1193 if (pkt
->sector
== zone
|| pkt
->list
.next
== &pd
->cdrw
.pkt_free_list
) {
1194 list_del_init(&pkt
->list
);
1195 if (pkt
->sector
!= zone
)
1196 pkt
->cache_valid
= 0;
1204 static void pkt_put_packet_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1206 if (pkt
->cache_valid
) {
1207 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1209 list_add_tail(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1214 * recover a failed write, query for relocation if possible
1216 * returns 1 if recovery is possible, or 0 if not
1219 static int pkt_start_recovery(struct packet_data
*pkt
)
1222 * FIXME. We need help from the file system to implement
1223 * recovery handling.
1227 struct request
*rq
= pkt
->rq
;
1228 struct pktcdvd_device
*pd
= rq
->rq_disk
->private_data
;
1229 struct block_device
*pkt_bdev
;
1230 struct super_block
*sb
= NULL
;
1231 unsigned long old_block
, new_block
;
1232 sector_t new_sector
;
1234 pkt_bdev
= bdget(kdev_t_to_nr(pd
->pkt_dev
));
1236 sb
= get_super(pkt_bdev
);
1243 if (!sb
->s_op
|| !sb
->s_op
->relocate_blocks
)
1246 old_block
= pkt
->sector
/ (CD_FRAMESIZE
>> 9);
1247 if (sb
->s_op
->relocate_blocks(sb
, old_block
, &new_block
))
1250 new_sector
= new_block
* (CD_FRAMESIZE
>> 9);
1251 pkt
->sector
= new_sector
;
1253 pkt
->bio
->bi_sector
= new_sector
;
1254 pkt
->bio
->bi_next
= NULL
;
1255 pkt
->bio
->bi_flags
= 1 << BIO_UPTODATE
;
1256 pkt
->bio
->bi_idx
= 0;
1258 BUG_ON(pkt
->bio
->bi_rw
!= (1 << BIO_RW
));
1259 BUG_ON(pkt
->bio
->bi_vcnt
!= pkt
->frames
);
1260 BUG_ON(pkt
->bio
->bi_size
!= pkt
->frames
* CD_FRAMESIZE
);
1261 BUG_ON(pkt
->bio
->bi_end_io
!= pkt_end_io_packet_write
);
1262 BUG_ON(pkt
->bio
->bi_private
!= pkt
);
1273 static inline void pkt_set_state(struct packet_data
*pkt
, enum packet_data_state state
)
1275 #if PACKET_DEBUG > 1
1276 static const char *state_name
[] = {
1277 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1279 enum packet_data_state old_state
= pkt
->state
;
1280 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt
->id
, (unsigned long long)pkt
->sector
,
1281 state_name
[old_state
], state_name
[state
]);
1287 * Scan the work queue to see if we can start a new packet.
1288 * returns non-zero if any work was done.
1290 static int pkt_handle_queue(struct pktcdvd_device
*pd
)
1292 struct packet_data
*pkt
, *p
;
1293 struct bio
*bio
= NULL
;
1294 sector_t zone
= 0; /* Suppress gcc warning */
1295 struct pkt_rb_node
*node
, *first_node
;
1299 VPRINTK("handle_queue\n");
1301 atomic_set(&pd
->scan_queue
, 0);
1303 if (list_empty(&pd
->cdrw
.pkt_free_list
)) {
1304 VPRINTK("handle_queue: no pkt\n");
1309 * Try to find a zone we are not already working on.
1311 spin_lock(&pd
->lock
);
1312 first_node
= pkt_rbtree_find(pd
, pd
->current_sector
);
1314 n
= rb_first(&pd
->bio_queue
);
1316 first_node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1321 zone
= ZONE(bio
->bi_sector
, pd
);
1322 list_for_each_entry(p
, &pd
->cdrw
.pkt_active_list
, list
) {
1323 if (p
->sector
== zone
) {
1330 node
= pkt_rbtree_next(node
);
1332 n
= rb_first(&pd
->bio_queue
);
1334 node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1336 if (node
== first_node
)
1339 spin_unlock(&pd
->lock
);
1341 VPRINTK("handle_queue: no bio\n");
1345 pkt
= pkt_get_packet_data(pd
, zone
);
1347 pd
->current_sector
= zone
+ pd
->settings
.size
;
1349 BUG_ON(pkt
->frames
!= pd
->settings
.size
>> 2);
1350 pkt
->write_size
= 0;
1353 * Scan work queue for bios in the same zone and link them
1356 spin_lock(&pd
->lock
);
1357 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone
);
1358 while ((node
= pkt_rbtree_find(pd
, zone
)) != NULL
) {
1360 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1361 (unsigned long long)ZONE(bio
->bi_sector
, pd
));
1362 if (ZONE(bio
->bi_sector
, pd
) != zone
)
1364 pkt_rbtree_erase(pd
, node
);
1365 spin_lock(&pkt
->lock
);
1366 pkt_add_list_last(bio
, &pkt
->orig_bios
, &pkt
->orig_bios_tail
);
1367 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
1368 spin_unlock(&pkt
->lock
);
1370 /* check write congestion marks, and if bio_queue_size is
1371 below, wake up any waiters */
1372 wakeup
= (pd
->write_congestion_on
> 0
1373 && pd
->bio_queue_size
<= pd
->write_congestion_off
);
1374 spin_unlock(&pd
->lock
);
1376 clear_bdi_congested(&pd
->disk
->queue
->backing_dev_info
, WRITE
);
1378 pkt
->sleep_time
= max(PACKET_WAIT_TIME
, 1);
1379 pkt_set_state(pkt
, PACKET_WAITING_STATE
);
1380 atomic_set(&pkt
->run_sm
, 1);
1382 spin_lock(&pd
->cdrw
.active_list_lock
);
1383 list_add(&pkt
->list
, &pd
->cdrw
.pkt_active_list
);
1384 spin_unlock(&pd
->cdrw
.active_list_lock
);
1390 * Assemble a bio to write one packet and queue the bio for processing
1391 * by the underlying block device.
1393 static void pkt_start_write(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1398 struct bio_vec
*bvec
= pkt
->w_bio
->bi_io_vec
;
1400 for (f
= 0; f
< pkt
->frames
; f
++) {
1401 bvec
[f
].bv_page
= pkt
->pages
[(f
* CD_FRAMESIZE
) / PAGE_SIZE
];
1402 bvec
[f
].bv_offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1406 * Fill-in bvec with data from orig_bios.
1409 spin_lock(&pkt
->lock
);
1410 for (bio
= pkt
->orig_bios
; bio
; bio
= bio
->bi_next
) {
1411 int segment
= bio
->bi_idx
;
1413 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1414 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1415 BUG_ON(first_frame
< 0);
1416 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1417 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++) {
1418 struct bio_vec
*src_bvl
= bio_iovec_idx(bio
, segment
);
1420 while (src_offs
>= src_bvl
->bv_len
) {
1421 src_offs
-= src_bvl
->bv_len
;
1423 BUG_ON(segment
>= bio
->bi_vcnt
);
1424 src_bvl
= bio_iovec_idx(bio
, segment
);
1427 if (src_bvl
->bv_len
- src_offs
>= CD_FRAMESIZE
) {
1428 bvec
[f
].bv_page
= src_bvl
->bv_page
;
1429 bvec
[f
].bv_offset
= src_bvl
->bv_offset
+ src_offs
;
1431 pkt_copy_bio_data(bio
, segment
, src_offs
,
1432 bvec
[f
].bv_page
, bvec
[f
].bv_offset
);
1434 src_offs
+= CD_FRAMESIZE
;
1438 pkt_set_state(pkt
, PACKET_WRITE_WAIT_STATE
);
1439 spin_unlock(&pkt
->lock
);
1441 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1442 frames_write
, (unsigned long long)pkt
->sector
);
1443 BUG_ON(frames_write
!= pkt
->write_size
);
1445 if (test_bit(PACKET_MERGE_SEGS
, &pd
->flags
) || (pkt
->write_size
< pkt
->frames
)) {
1446 pkt_make_local_copy(pkt
, bvec
);
1447 pkt
->cache_valid
= 1;
1449 pkt
->cache_valid
= 0;
1452 /* Start the write request */
1453 bio_init(pkt
->w_bio
);
1454 pkt
->w_bio
->bi_max_vecs
= PACKET_MAX_SIZE
;
1455 pkt
->w_bio
->bi_sector
= pkt
->sector
;
1456 pkt
->w_bio
->bi_bdev
= pd
->bdev
;
1457 pkt
->w_bio
->bi_end_io
= pkt_end_io_packet_write
;
1458 pkt
->w_bio
->bi_private
= pkt
;
1459 pkt
->w_bio
->bi_io_vec
= bvec
;
1460 pkt
->w_bio
->bi_destructor
= pkt_bio_destructor
;
1461 for (f
= 0; f
< pkt
->frames
; f
++)
1462 if (!bio_add_page(pkt
->w_bio
, bvec
[f
].bv_page
, CD_FRAMESIZE
, bvec
[f
].bv_offset
))
1464 VPRINTK(DRIVER_NAME
": vcnt=%d\n", pkt
->w_bio
->bi_vcnt
);
1466 atomic_set(&pkt
->io_wait
, 1);
1467 pkt
->w_bio
->bi_rw
= WRITE
;
1468 pkt_queue_bio(pd
, pkt
->w_bio
);
1471 static void pkt_finish_packet(struct packet_data
*pkt
, int uptodate
)
1473 struct bio
*bio
, *next
;
1476 pkt
->cache_valid
= 0;
1478 /* Finish all bios corresponding to this packet */
1479 bio
= pkt
->orig_bios
;
1481 next
= bio
->bi_next
;
1482 bio
->bi_next
= NULL
;
1483 bio_endio(bio
, uptodate
? 0 : -EIO
);
1486 pkt
->orig_bios
= pkt
->orig_bios_tail
= NULL
;
1489 static void pkt_run_state_machine(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1493 VPRINTK("run_state_machine: pkt %d\n", pkt
->id
);
1496 switch (pkt
->state
) {
1497 case PACKET_WAITING_STATE
:
1498 if ((pkt
->write_size
< pkt
->frames
) && (pkt
->sleep_time
> 0))
1501 pkt
->sleep_time
= 0;
1502 pkt_gather_data(pd
, pkt
);
1503 pkt_set_state(pkt
, PACKET_READ_WAIT_STATE
);
1506 case PACKET_READ_WAIT_STATE
:
1507 if (atomic_read(&pkt
->io_wait
) > 0)
1510 if (atomic_read(&pkt
->io_errors
) > 0) {
1511 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1513 pkt_start_write(pd
, pkt
);
1517 case PACKET_WRITE_WAIT_STATE
:
1518 if (atomic_read(&pkt
->io_wait
) > 0)
1521 if (test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
)) {
1522 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1524 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1528 case PACKET_RECOVERY_STATE
:
1529 if (pkt_start_recovery(pkt
)) {
1530 pkt_start_write(pd
, pkt
);
1532 VPRINTK("No recovery possible\n");
1533 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1537 case PACKET_FINISHED_STATE
:
1538 uptodate
= test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
);
1539 pkt_finish_packet(pkt
, uptodate
);
1549 static void pkt_handle_packets(struct pktcdvd_device
*pd
)
1551 struct packet_data
*pkt
, *next
;
1553 VPRINTK("pkt_handle_packets\n");
1556 * Run state machine for active packets
1558 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1559 if (atomic_read(&pkt
->run_sm
) > 0) {
1560 atomic_set(&pkt
->run_sm
, 0);
1561 pkt_run_state_machine(pd
, pkt
);
1566 * Move no longer active packets to the free list
1568 spin_lock(&pd
->cdrw
.active_list_lock
);
1569 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_active_list
, list
) {
1570 if (pkt
->state
== PACKET_FINISHED_STATE
) {
1571 list_del(&pkt
->list
);
1572 pkt_put_packet_data(pd
, pkt
);
1573 pkt_set_state(pkt
, PACKET_IDLE_STATE
);
1574 atomic_set(&pd
->scan_queue
, 1);
1577 spin_unlock(&pd
->cdrw
.active_list_lock
);
1580 static void pkt_count_states(struct pktcdvd_device
*pd
, int *states
)
1582 struct packet_data
*pkt
;
1585 for (i
= 0; i
< PACKET_NUM_STATES
; i
++)
1588 spin_lock(&pd
->cdrw
.active_list_lock
);
1589 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1590 states
[pkt
->state
]++;
1592 spin_unlock(&pd
->cdrw
.active_list_lock
);
1596 * kcdrwd is woken up when writes have been queued for one of our
1597 * registered devices
1599 static int kcdrwd(void *foobar
)
1601 struct pktcdvd_device
*pd
= foobar
;
1602 struct packet_data
*pkt
;
1603 long min_sleep_time
, residue
;
1605 set_user_nice(current
, -20);
1609 DECLARE_WAITQUEUE(wait
, current
);
1612 * Wait until there is something to do
1614 add_wait_queue(&pd
->wqueue
, &wait
);
1616 set_current_state(TASK_INTERRUPTIBLE
);
1618 /* Check if we need to run pkt_handle_queue */
1619 if (atomic_read(&pd
->scan_queue
) > 0)
1622 /* Check if we need to run the state machine for some packet */
1623 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1624 if (atomic_read(&pkt
->run_sm
) > 0)
1628 /* Check if we need to process the iosched queues */
1629 if (atomic_read(&pd
->iosched
.attention
) != 0)
1632 /* Otherwise, go to sleep */
1633 if (PACKET_DEBUG
> 1) {
1634 int states
[PACKET_NUM_STATES
];
1635 pkt_count_states(pd
, states
);
1636 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1637 states
[0], states
[1], states
[2], states
[3],
1638 states
[4], states
[5]);
1641 min_sleep_time
= MAX_SCHEDULE_TIMEOUT
;
1642 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1643 if (pkt
->sleep_time
&& pkt
->sleep_time
< min_sleep_time
)
1644 min_sleep_time
= pkt
->sleep_time
;
1647 generic_unplug_device(bdev_get_queue(pd
->bdev
));
1649 VPRINTK("kcdrwd: sleeping\n");
1650 residue
= schedule_timeout(min_sleep_time
);
1651 VPRINTK("kcdrwd: wake up\n");
1653 /* make swsusp happy with our thread */
1656 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1657 if (!pkt
->sleep_time
)
1659 pkt
->sleep_time
-= min_sleep_time
- residue
;
1660 if (pkt
->sleep_time
<= 0) {
1661 pkt
->sleep_time
= 0;
1662 atomic_inc(&pkt
->run_sm
);
1666 if (kthread_should_stop())
1670 set_current_state(TASK_RUNNING
);
1671 remove_wait_queue(&pd
->wqueue
, &wait
);
1673 if (kthread_should_stop())
1677 * if pkt_handle_queue returns true, we can queue
1680 while (pkt_handle_queue(pd
))
1684 * Handle packet state machine
1686 pkt_handle_packets(pd
);
1689 * Handle iosched queues
1691 pkt_iosched_process_queue(pd
);
1697 static void pkt_print_settings(struct pktcdvd_device
*pd
)
1699 printk(DRIVER_NAME
": %s packets, ", pd
->settings
.fp
? "Fixed" : "Variable");
1700 printk("%u blocks, ", pd
->settings
.size
>> 2);
1701 printk("Mode-%c disc\n", pd
->settings
.block_mode
== 8 ? '1' : '2');
1704 static int pkt_mode_sense(struct pktcdvd_device
*pd
, struct packet_command
*cgc
, int page_code
, int page_control
)
1706 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1708 cgc
->cmd
[0] = GPCMD_MODE_SENSE_10
;
1709 cgc
->cmd
[2] = page_code
| (page_control
<< 6);
1710 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1711 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1712 cgc
->data_direction
= CGC_DATA_READ
;
1713 return pkt_generic_packet(pd
, cgc
);
1716 static int pkt_mode_select(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
1718 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1719 memset(cgc
->buffer
, 0, 2);
1720 cgc
->cmd
[0] = GPCMD_MODE_SELECT_10
;
1721 cgc
->cmd
[1] = 0x10; /* PF */
1722 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1723 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1724 cgc
->data_direction
= CGC_DATA_WRITE
;
1725 return pkt_generic_packet(pd
, cgc
);
1728 static int pkt_get_disc_info(struct pktcdvd_device
*pd
, disc_information
*di
)
1730 struct packet_command cgc
;
1733 /* set up command and get the disc info */
1734 init_cdrom_command(&cgc
, di
, sizeof(*di
), CGC_DATA_READ
);
1735 cgc
.cmd
[0] = GPCMD_READ_DISC_INFO
;
1736 cgc
.cmd
[8] = cgc
.buflen
= 2;
1739 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1742 /* not all drives have the same disc_info length, so requeue
1743 * packet with the length the drive tells us it can supply
1745 cgc
.buflen
= be16_to_cpu(di
->disc_information_length
) +
1746 sizeof(di
->disc_information_length
);
1748 if (cgc
.buflen
> sizeof(disc_information
))
1749 cgc
.buflen
= sizeof(disc_information
);
1751 cgc
.cmd
[8] = cgc
.buflen
;
1752 return pkt_generic_packet(pd
, &cgc
);
1755 static int pkt_get_track_info(struct pktcdvd_device
*pd
, __u16 track
, __u8 type
, track_information
*ti
)
1757 struct packet_command cgc
;
1760 init_cdrom_command(&cgc
, ti
, 8, CGC_DATA_READ
);
1761 cgc
.cmd
[0] = GPCMD_READ_TRACK_RZONE_INFO
;
1762 cgc
.cmd
[1] = type
& 3;
1763 cgc
.cmd
[4] = (track
& 0xff00) >> 8;
1764 cgc
.cmd
[5] = track
& 0xff;
1768 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1771 cgc
.buflen
= be16_to_cpu(ti
->track_information_length
) +
1772 sizeof(ti
->track_information_length
);
1774 if (cgc
.buflen
> sizeof(track_information
))
1775 cgc
.buflen
= sizeof(track_information
);
1777 cgc
.cmd
[8] = cgc
.buflen
;
1778 return pkt_generic_packet(pd
, &cgc
);
1781 static noinline_for_stack
int pkt_get_last_written(struct pktcdvd_device
*pd
,
1784 disc_information di
;
1785 track_information ti
;
1789 if ((ret
= pkt_get_disc_info(pd
, &di
)))
1792 last_track
= (di
.last_track_msb
<< 8) | di
.last_track_lsb
;
1793 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1796 /* if this track is blank, try the previous. */
1799 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1803 /* if last recorded field is valid, return it. */
1805 *last_written
= be32_to_cpu(ti
.last_rec_address
);
1807 /* make it up instead */
1808 *last_written
= be32_to_cpu(ti
.track_start
) +
1809 be32_to_cpu(ti
.track_size
);
1811 *last_written
-= (be32_to_cpu(ti
.free_blocks
) + 7);
1817 * write mode select package based on pd->settings
1819 static noinline_for_stack
int pkt_set_write_settings(struct pktcdvd_device
*pd
)
1821 struct packet_command cgc
;
1822 struct request_sense sense
;
1823 write_param_page
*wp
;
1827 /* doesn't apply to DVD+RW or DVD-RAM */
1828 if ((pd
->mmc3_profile
== 0x1a) || (pd
->mmc3_profile
== 0x12))
1831 memset(buffer
, 0, sizeof(buffer
));
1832 init_cdrom_command(&cgc
, buffer
, sizeof(*wp
), CGC_DATA_READ
);
1834 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1835 pkt_dump_sense(&cgc
);
1839 size
= 2 + ((buffer
[0] << 8) | (buffer
[1] & 0xff));
1840 pd
->mode_offset
= (buffer
[6] << 8) | (buffer
[7] & 0xff);
1841 if (size
> sizeof(buffer
))
1842 size
= sizeof(buffer
);
1847 init_cdrom_command(&cgc
, buffer
, size
, CGC_DATA_READ
);
1849 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1850 pkt_dump_sense(&cgc
);
1855 * write page is offset header + block descriptor length
1857 wp
= (write_param_page
*) &buffer
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
1859 wp
->fp
= pd
->settings
.fp
;
1860 wp
->track_mode
= pd
->settings
.track_mode
;
1861 wp
->write_type
= pd
->settings
.write_type
;
1862 wp
->data_block_type
= pd
->settings
.block_mode
;
1864 wp
->multi_session
= 0;
1866 #ifdef PACKET_USE_LS
1871 if (wp
->data_block_type
== PACKET_BLOCK_MODE1
) {
1872 wp
->session_format
= 0;
1874 } else if (wp
->data_block_type
== PACKET_BLOCK_MODE2
) {
1875 wp
->session_format
= 0x20;
1879 memcpy(&wp
->mcn
[1], PACKET_MCN
, sizeof(wp
->mcn
) - 1);
1885 printk(DRIVER_NAME
": write mode wrong %d\n", wp
->data_block_type
);
1888 wp
->packet_size
= cpu_to_be32(pd
->settings
.size
>> 2);
1890 cgc
.buflen
= cgc
.cmd
[8] = size
;
1891 if ((ret
= pkt_mode_select(pd
, &cgc
))) {
1892 pkt_dump_sense(&cgc
);
1896 pkt_print_settings(pd
);
1901 * 1 -- we can write to this track, 0 -- we can't
1903 static int pkt_writable_track(struct pktcdvd_device
*pd
, track_information
*ti
)
1905 switch (pd
->mmc3_profile
) {
1906 case 0x1a: /* DVD+RW */
1907 case 0x12: /* DVD-RAM */
1908 /* The track is always writable on DVD+RW/DVD-RAM */
1914 if (!ti
->packet
|| !ti
->fp
)
1918 * "good" settings as per Mt Fuji.
1920 if (ti
->rt
== 0 && ti
->blank
== 0)
1923 if (ti
->rt
== 0 && ti
->blank
== 1)
1926 if (ti
->rt
== 1 && ti
->blank
== 0)
1929 printk(DRIVER_NAME
": bad state %d-%d-%d\n", ti
->rt
, ti
->blank
, ti
->packet
);
1934 * 1 -- we can write to this disc, 0 -- we can't
1936 static int pkt_writable_disc(struct pktcdvd_device
*pd
, disc_information
*di
)
1938 switch (pd
->mmc3_profile
) {
1939 case 0x0a: /* CD-RW */
1940 case 0xffff: /* MMC3 not supported */
1942 case 0x1a: /* DVD+RW */
1943 case 0x13: /* DVD-RW */
1944 case 0x12: /* DVD-RAM */
1947 VPRINTK(DRIVER_NAME
": Wrong disc profile (%x)\n", pd
->mmc3_profile
);
1952 * for disc type 0xff we should probably reserve a new track.
1953 * but i'm not sure, should we leave this to user apps? probably.
1955 if (di
->disc_type
== 0xff) {
1956 printk(DRIVER_NAME
": Unknown disc. No track?\n");
1960 if (di
->disc_type
!= 0x20 && di
->disc_type
!= 0) {
1961 printk(DRIVER_NAME
": Wrong disc type (%x)\n", di
->disc_type
);
1965 if (di
->erasable
== 0) {
1966 printk(DRIVER_NAME
": Disc not erasable\n");
1970 if (di
->border_status
== PACKET_SESSION_RESERVED
) {
1971 printk(DRIVER_NAME
": Can't write to last track (reserved)\n");
1978 static noinline_for_stack
int pkt_probe_settings(struct pktcdvd_device
*pd
)
1980 struct packet_command cgc
;
1981 unsigned char buf
[12];
1982 disc_information di
;
1983 track_information ti
;
1986 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1987 cgc
.cmd
[0] = GPCMD_GET_CONFIGURATION
;
1989 ret
= pkt_generic_packet(pd
, &cgc
);
1990 pd
->mmc3_profile
= ret
? 0xffff : buf
[6] << 8 | buf
[7];
1992 memset(&di
, 0, sizeof(disc_information
));
1993 memset(&ti
, 0, sizeof(track_information
));
1995 if ((ret
= pkt_get_disc_info(pd
, &di
))) {
1996 printk("failed get_disc\n");
2000 if (!pkt_writable_disc(pd
, &di
))
2003 pd
->type
= di
.erasable
? PACKET_CDRW
: PACKET_CDR
;
2005 track
= 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
2006 if ((ret
= pkt_get_track_info(pd
, track
, 1, &ti
))) {
2007 printk(DRIVER_NAME
": failed get_track\n");
2011 if (!pkt_writable_track(pd
, &ti
)) {
2012 printk(DRIVER_NAME
": can't write to this track\n");
2017 * we keep packet size in 512 byte units, makes it easier to
2018 * deal with request calculations.
2020 pd
->settings
.size
= be32_to_cpu(ti
.fixed_packet_size
) << 2;
2021 if (pd
->settings
.size
== 0) {
2022 printk(DRIVER_NAME
": detected zero packet size!\n");
2025 if (pd
->settings
.size
> PACKET_MAX_SECTORS
) {
2026 printk(DRIVER_NAME
": packet size is too big\n");
2029 pd
->settings
.fp
= ti
.fp
;
2030 pd
->offset
= (be32_to_cpu(ti
.track_start
) << 2) & (pd
->settings
.size
- 1);
2033 pd
->nwa
= be32_to_cpu(ti
.next_writable
);
2034 set_bit(PACKET_NWA_VALID
, &pd
->flags
);
2038 * in theory we could use lra on -RW media as well and just zero
2039 * blocks that haven't been written yet, but in practice that
2040 * is just a no-go. we'll use that for -R, naturally.
2043 pd
->lra
= be32_to_cpu(ti
.last_rec_address
);
2044 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
2046 pd
->lra
= 0xffffffff;
2047 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
2053 pd
->settings
.link_loss
= 7;
2054 pd
->settings
.write_type
= 0; /* packet */
2055 pd
->settings
.track_mode
= ti
.track_mode
;
2058 * mode1 or mode2 disc
2060 switch (ti
.data_mode
) {
2062 pd
->settings
.block_mode
= PACKET_BLOCK_MODE1
;
2065 pd
->settings
.block_mode
= PACKET_BLOCK_MODE2
;
2068 printk(DRIVER_NAME
": unknown data mode\n");
2075 * enable/disable write caching on drive
2077 static noinline_for_stack
int pkt_write_caching(struct pktcdvd_device
*pd
,
2080 struct packet_command cgc
;
2081 struct request_sense sense
;
2082 unsigned char buf
[64];
2085 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
2087 cgc
.buflen
= pd
->mode_offset
+ 12;
2090 * caching mode page might not be there, so quiet this command
2094 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WCACHING_PAGE
, 0)))
2097 buf
[pd
->mode_offset
+ 10] |= (!!set
<< 2);
2099 cgc
.buflen
= cgc
.cmd
[8] = 2 + ((buf
[0] << 8) | (buf
[1] & 0xff));
2100 ret
= pkt_mode_select(pd
, &cgc
);
2102 printk(DRIVER_NAME
": write caching control failed\n");
2103 pkt_dump_sense(&cgc
);
2104 } else if (!ret
&& set
)
2105 printk(DRIVER_NAME
": enabled write caching on %s\n", pd
->name
);
2109 static int pkt_lock_door(struct pktcdvd_device
*pd
, int lockflag
)
2111 struct packet_command cgc
;
2113 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2114 cgc
.cmd
[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL
;
2115 cgc
.cmd
[4] = lockflag
? 1 : 0;
2116 return pkt_generic_packet(pd
, &cgc
);
2120 * Returns drive maximum write speed
2122 static noinline_for_stack
int pkt_get_max_speed(struct pktcdvd_device
*pd
,
2123 unsigned *write_speed
)
2125 struct packet_command cgc
;
2126 struct request_sense sense
;
2127 unsigned char buf
[256+18];
2128 unsigned char *cap_buf
;
2131 cap_buf
= &buf
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
2132 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_UNKNOWN
);
2135 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2137 cgc
.buflen
= pd
->mode_offset
+ cap_buf
[1] + 2 +
2138 sizeof(struct mode_page_header
);
2139 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2141 pkt_dump_sense(&cgc
);
2146 offset
= 20; /* Obsoleted field, used by older drives */
2147 if (cap_buf
[1] >= 28)
2148 offset
= 28; /* Current write speed selected */
2149 if (cap_buf
[1] >= 30) {
2150 /* If the drive reports at least one "Logical Unit Write
2151 * Speed Performance Descriptor Block", use the information
2152 * in the first block. (contains the highest speed)
2154 int num_spdb
= (cap_buf
[30] << 8) + cap_buf
[31];
2159 *write_speed
= (cap_buf
[offset
] << 8) | cap_buf
[offset
+ 1];
2163 /* These tables from cdrecord - I don't have orange book */
2164 /* standard speed CD-RW (1-4x) */
2165 static char clv_to_speed
[16] = {
2166 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2167 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2169 /* high speed CD-RW (-10x) */
2170 static char hs_clv_to_speed
[16] = {
2171 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2172 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2174 /* ultra high speed CD-RW */
2175 static char us_clv_to_speed
[16] = {
2176 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2177 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2181 * reads the maximum media speed from ATIP
2183 static noinline_for_stack
int pkt_media_speed(struct pktcdvd_device
*pd
,
2186 struct packet_command cgc
;
2187 struct request_sense sense
;
2188 unsigned char buf
[64];
2189 unsigned int size
, st
, sp
;
2192 init_cdrom_command(&cgc
, buf
, 2, CGC_DATA_READ
);
2194 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2196 cgc
.cmd
[2] = 4; /* READ ATIP */
2198 ret
= pkt_generic_packet(pd
, &cgc
);
2200 pkt_dump_sense(&cgc
);
2203 size
= ((unsigned int) buf
[0]<<8) + buf
[1] + 2;
2204 if (size
> sizeof(buf
))
2207 init_cdrom_command(&cgc
, buf
, size
, CGC_DATA_READ
);
2209 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2213 ret
= pkt_generic_packet(pd
, &cgc
);
2215 pkt_dump_sense(&cgc
);
2219 if (!(buf
[6] & 0x40)) {
2220 printk(DRIVER_NAME
": Disc type is not CD-RW\n");
2223 if (!(buf
[6] & 0x4)) {
2224 printk(DRIVER_NAME
": A1 values on media are not valid, maybe not CDRW?\n");
2228 st
= (buf
[6] >> 3) & 0x7; /* disc sub-type */
2230 sp
= buf
[16] & 0xf; /* max speed from ATIP A1 field */
2232 /* Info from cdrecord */
2234 case 0: /* standard speed */
2235 *speed
= clv_to_speed
[sp
];
2237 case 1: /* high speed */
2238 *speed
= hs_clv_to_speed
[sp
];
2240 case 2: /* ultra high speed */
2241 *speed
= us_clv_to_speed
[sp
];
2244 printk(DRIVER_NAME
": Unknown disc sub-type %d\n",st
);
2248 printk(DRIVER_NAME
": Max. media speed: %d\n",*speed
);
2251 printk(DRIVER_NAME
": Unknown speed %d for sub-type %d\n",sp
,st
);
2256 static noinline_for_stack
int pkt_perform_opc(struct pktcdvd_device
*pd
)
2258 struct packet_command cgc
;
2259 struct request_sense sense
;
2262 VPRINTK(DRIVER_NAME
": Performing OPC\n");
2264 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2266 cgc
.timeout
= 60*HZ
;
2267 cgc
.cmd
[0] = GPCMD_SEND_OPC
;
2269 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
2270 pkt_dump_sense(&cgc
);
2274 static int pkt_open_write(struct pktcdvd_device
*pd
)
2277 unsigned int write_speed
, media_write_speed
, read_speed
;
2279 if ((ret
= pkt_probe_settings(pd
))) {
2280 VPRINTK(DRIVER_NAME
": %s failed probe\n", pd
->name
);
2284 if ((ret
= pkt_set_write_settings(pd
))) {
2285 DPRINTK(DRIVER_NAME
": %s failed saving write settings\n", pd
->name
);
2289 pkt_write_caching(pd
, USE_WCACHING
);
2291 if ((ret
= pkt_get_max_speed(pd
, &write_speed
)))
2292 write_speed
= 16 * 177;
2293 switch (pd
->mmc3_profile
) {
2294 case 0x13: /* DVD-RW */
2295 case 0x1a: /* DVD+RW */
2296 case 0x12: /* DVD-RAM */
2297 DPRINTK(DRIVER_NAME
": write speed %ukB/s\n", write_speed
);
2300 if ((ret
= pkt_media_speed(pd
, &media_write_speed
)))
2301 media_write_speed
= 16;
2302 write_speed
= min(write_speed
, media_write_speed
* 177);
2303 DPRINTK(DRIVER_NAME
": write speed %ux\n", write_speed
/ 176);
2306 read_speed
= write_speed
;
2308 if ((ret
= pkt_set_speed(pd
, write_speed
, read_speed
))) {
2309 DPRINTK(DRIVER_NAME
": %s couldn't set write speed\n", pd
->name
);
2312 pd
->write_speed
= write_speed
;
2313 pd
->read_speed
= read_speed
;
2315 if ((ret
= pkt_perform_opc(pd
))) {
2316 DPRINTK(DRIVER_NAME
": %s Optimum Power Calibration failed\n", pd
->name
);
2323 * called at open time.
2325 static int pkt_open_dev(struct pktcdvd_device
*pd
, fmode_t write
)
2329 struct request_queue
*q
;
2332 * We need to re-open the cdrom device without O_NONBLOCK to be able
2333 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2334 * so bdget() can't fail.
2336 bdget(pd
->bdev
->bd_dev
);
2337 if ((ret
= blkdev_get(pd
->bdev
, FMODE_READ
)))
2340 if ((ret
= bd_claim(pd
->bdev
, pd
)))
2343 if ((ret
= pkt_get_last_written(pd
, &lba
))) {
2344 printk(DRIVER_NAME
": pkt_get_last_written failed\n");
2348 set_capacity(pd
->disk
, lba
<< 2);
2349 set_capacity(pd
->bdev
->bd_disk
, lba
<< 2);
2350 bd_set_size(pd
->bdev
, (loff_t
)lba
<< 11);
2352 q
= bdev_get_queue(pd
->bdev
);
2354 if ((ret
= pkt_open_write(pd
)))
2357 * Some CDRW drives can not handle writes larger than one packet,
2358 * even if the size is a multiple of the packet size.
2360 spin_lock_irq(q
->queue_lock
);
2361 blk_queue_max_sectors(q
, pd
->settings
.size
);
2362 spin_unlock_irq(q
->queue_lock
);
2363 set_bit(PACKET_WRITABLE
, &pd
->flags
);
2365 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2366 clear_bit(PACKET_WRITABLE
, &pd
->flags
);
2369 if ((ret
= pkt_set_segment_merging(pd
, q
)))
2373 if (!pkt_grow_pktlist(pd
, CONFIG_CDROM_PKTCDVD_BUFFERS
)) {
2374 printk(DRIVER_NAME
": not enough memory for buffers\n");
2378 printk(DRIVER_NAME
": %lukB available on disc\n", lba
<< 1);
2384 bd_release(pd
->bdev
);
2386 blkdev_put(pd
->bdev
, FMODE_READ
);
2392 * called when the device is closed. makes sure that the device flushes
2393 * the internal cache before we close.
2395 static void pkt_release_dev(struct pktcdvd_device
*pd
, int flush
)
2397 if (flush
&& pkt_flush_cache(pd
))
2398 DPRINTK(DRIVER_NAME
": %s not flushing cache\n", pd
->name
);
2400 pkt_lock_door(pd
, 0);
2402 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2403 bd_release(pd
->bdev
);
2404 blkdev_put(pd
->bdev
, FMODE_READ
);
2406 pkt_shrink_pktlist(pd
);
2409 static struct pktcdvd_device
*pkt_find_dev_from_minor(int dev_minor
)
2411 if (dev_minor
>= MAX_WRITERS
)
2413 return pkt_devs
[dev_minor
];
2416 static int pkt_open(struct block_device
*bdev
, fmode_t mode
)
2418 struct pktcdvd_device
*pd
= NULL
;
2421 VPRINTK(DRIVER_NAME
": entering open\n");
2423 mutex_lock(&ctl_mutex
);
2424 pd
= pkt_find_dev_from_minor(MINOR(bdev
->bd_dev
));
2429 BUG_ON(pd
->refcnt
< 0);
2432 if (pd
->refcnt
> 1) {
2433 if ((mode
& FMODE_WRITE
) &&
2434 !test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2439 ret
= pkt_open_dev(pd
, mode
& FMODE_WRITE
);
2443 * needed here as well, since ext2 (among others) may change
2444 * the blocksize at mount time
2446 set_blocksize(bdev
, CD_FRAMESIZE
);
2449 mutex_unlock(&ctl_mutex
);
2455 VPRINTK(DRIVER_NAME
": failed open (%d)\n", ret
);
2456 mutex_unlock(&ctl_mutex
);
2460 static int pkt_close(struct gendisk
*disk
, fmode_t mode
)
2462 struct pktcdvd_device
*pd
= disk
->private_data
;
2465 mutex_lock(&ctl_mutex
);
2467 BUG_ON(pd
->refcnt
< 0);
2468 if (pd
->refcnt
== 0) {
2469 int flush
= test_bit(PACKET_WRITABLE
, &pd
->flags
);
2470 pkt_release_dev(pd
, flush
);
2472 mutex_unlock(&ctl_mutex
);
2477 static void pkt_end_io_read_cloned(struct bio
*bio
, int err
)
2479 struct packet_stacked_data
*psd
= bio
->bi_private
;
2480 struct pktcdvd_device
*pd
= psd
->pd
;
2483 bio_endio(psd
->bio
, err
);
2484 mempool_free(psd
, psd_pool
);
2485 pkt_bio_finished(pd
);
2488 static int pkt_make_request(struct request_queue
*q
, struct bio
*bio
)
2490 struct pktcdvd_device
*pd
;
2491 char b
[BDEVNAME_SIZE
];
2493 struct packet_data
*pkt
;
2494 int was_empty
, blocked_bio
;
2495 struct pkt_rb_node
*node
;
2499 printk(DRIVER_NAME
": %s incorrect request queue\n", bdevname(bio
->bi_bdev
, b
));
2504 * Clone READ bios so we can have our own bi_end_io callback.
2506 if (bio_data_dir(bio
) == READ
) {
2507 struct bio
*cloned_bio
= bio_clone(bio
, GFP_NOIO
);
2508 struct packet_stacked_data
*psd
= mempool_alloc(psd_pool
, GFP_NOIO
);
2512 cloned_bio
->bi_bdev
= pd
->bdev
;
2513 cloned_bio
->bi_private
= psd
;
2514 cloned_bio
->bi_end_io
= pkt_end_io_read_cloned
;
2515 pd
->stats
.secs_r
+= bio
->bi_size
>> 9;
2516 pkt_queue_bio(pd
, cloned_bio
);
2520 if (!test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2521 printk(DRIVER_NAME
": WRITE for ro device %s (%llu)\n",
2522 pd
->name
, (unsigned long long)bio
->bi_sector
);
2526 if (!bio
->bi_size
|| (bio
->bi_size
% CD_FRAMESIZE
)) {
2527 printk(DRIVER_NAME
": wrong bio size\n");
2531 blk_queue_bounce(q
, &bio
);
2533 zone
= ZONE(bio
->bi_sector
, pd
);
2534 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2535 (unsigned long long)bio
->bi_sector
,
2536 (unsigned long long)(bio
->bi_sector
+ bio_sectors(bio
)));
2538 /* Check if we have to split the bio */
2540 struct bio_pair
*bp
;
2544 last_zone
= ZONE(bio
->bi_sector
+ bio_sectors(bio
) - 1, pd
);
2545 if (last_zone
!= zone
) {
2546 BUG_ON(last_zone
!= zone
+ pd
->settings
.size
);
2547 first_sectors
= last_zone
- bio
->bi_sector
;
2548 bp
= bio_split(bio
, first_sectors
);
2550 pkt_make_request(q
, &bp
->bio1
);
2551 pkt_make_request(q
, &bp
->bio2
);
2552 bio_pair_release(bp
);
2558 * If we find a matching packet in state WAITING or READ_WAIT, we can
2559 * just append this bio to that packet.
2561 spin_lock(&pd
->cdrw
.active_list_lock
);
2563 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
2564 if (pkt
->sector
== zone
) {
2565 spin_lock(&pkt
->lock
);
2566 if ((pkt
->state
== PACKET_WAITING_STATE
) ||
2567 (pkt
->state
== PACKET_READ_WAIT_STATE
)) {
2568 pkt_add_list_last(bio
, &pkt
->orig_bios
,
2569 &pkt
->orig_bios_tail
);
2570 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
2571 if ((pkt
->write_size
>= pkt
->frames
) &&
2572 (pkt
->state
== PACKET_WAITING_STATE
)) {
2573 atomic_inc(&pkt
->run_sm
);
2574 wake_up(&pd
->wqueue
);
2576 spin_unlock(&pkt
->lock
);
2577 spin_unlock(&pd
->cdrw
.active_list_lock
);
2582 spin_unlock(&pkt
->lock
);
2585 spin_unlock(&pd
->cdrw
.active_list_lock
);
2588 * Test if there is enough room left in the bio work queue
2589 * (queue size >= congestion on mark).
2590 * If not, wait till the work queue size is below the congestion off mark.
2592 spin_lock(&pd
->lock
);
2593 if (pd
->write_congestion_on
> 0
2594 && pd
->bio_queue_size
>= pd
->write_congestion_on
) {
2595 set_bdi_congested(&q
->backing_dev_info
, WRITE
);
2597 spin_unlock(&pd
->lock
);
2598 congestion_wait(WRITE
, HZ
);
2599 spin_lock(&pd
->lock
);
2600 } while(pd
->bio_queue_size
> pd
->write_congestion_off
);
2602 spin_unlock(&pd
->lock
);
2605 * No matching packet found. Store the bio in the work queue.
2607 node
= mempool_alloc(pd
->rb_pool
, GFP_NOIO
);
2609 spin_lock(&pd
->lock
);
2610 BUG_ON(pd
->bio_queue_size
< 0);
2611 was_empty
= (pd
->bio_queue_size
== 0);
2612 pkt_rbtree_insert(pd
, node
);
2613 spin_unlock(&pd
->lock
);
2616 * Wake up the worker thread.
2618 atomic_set(&pd
->scan_queue
, 1);
2620 /* This wake_up is required for correct operation */
2621 wake_up(&pd
->wqueue
);
2622 } else if (!list_empty(&pd
->cdrw
.pkt_free_list
) && !blocked_bio
) {
2624 * This wake up is not required for correct operation,
2625 * but improves performance in some cases.
2627 wake_up(&pd
->wqueue
);
2637 static int pkt_merge_bvec(struct request_queue
*q
, struct bvec_merge_data
*bmd
,
2638 struct bio_vec
*bvec
)
2640 struct pktcdvd_device
*pd
= q
->queuedata
;
2641 sector_t zone
= ZONE(bmd
->bi_sector
, pd
);
2642 int used
= ((bmd
->bi_sector
- zone
) << 9) + bmd
->bi_size
;
2643 int remaining
= (pd
->settings
.size
<< 9) - used
;
2647 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2648 * boundary, pkt_make_request() will split the bio.
2650 remaining2
= PAGE_SIZE
- bmd
->bi_size
;
2651 remaining
= max(remaining
, remaining2
);
2653 BUG_ON(remaining
< 0);
2657 static void pkt_init_queue(struct pktcdvd_device
*pd
)
2659 struct request_queue
*q
= pd
->disk
->queue
;
2661 blk_queue_make_request(q
, pkt_make_request
);
2662 blk_queue_logical_block_size(q
, CD_FRAMESIZE
);
2663 blk_queue_max_sectors(q
, PACKET_MAX_SECTORS
);
2664 blk_queue_merge_bvec(q
, pkt_merge_bvec
);
2668 static int pkt_seq_show(struct seq_file
*m
, void *p
)
2670 struct pktcdvd_device
*pd
= m
->private;
2672 char bdev_buf
[BDEVNAME_SIZE
];
2673 int states
[PACKET_NUM_STATES
];
2675 seq_printf(m
, "Writer %s mapped to %s:\n", pd
->name
,
2676 bdevname(pd
->bdev
, bdev_buf
));
2678 seq_printf(m
, "\nSettings:\n");
2679 seq_printf(m
, "\tpacket size:\t\t%dkB\n", pd
->settings
.size
/ 2);
2681 if (pd
->settings
.write_type
== 0)
2685 seq_printf(m
, "\twrite type:\t\t%s\n", msg
);
2687 seq_printf(m
, "\tpacket type:\t\t%s\n", pd
->settings
.fp
? "Fixed" : "Variable");
2688 seq_printf(m
, "\tlink loss:\t\t%d\n", pd
->settings
.link_loss
);
2690 seq_printf(m
, "\ttrack mode:\t\t%d\n", pd
->settings
.track_mode
);
2692 if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE1
)
2694 else if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE2
)
2698 seq_printf(m
, "\tblock mode:\t\t%s\n", msg
);
2700 seq_printf(m
, "\nStatistics:\n");
2701 seq_printf(m
, "\tpackets started:\t%lu\n", pd
->stats
.pkt_started
);
2702 seq_printf(m
, "\tpackets ended:\t\t%lu\n", pd
->stats
.pkt_ended
);
2703 seq_printf(m
, "\twritten:\t\t%lukB\n", pd
->stats
.secs_w
>> 1);
2704 seq_printf(m
, "\tread gather:\t\t%lukB\n", pd
->stats
.secs_rg
>> 1);
2705 seq_printf(m
, "\tread:\t\t\t%lukB\n", pd
->stats
.secs_r
>> 1);
2707 seq_printf(m
, "\nMisc:\n");
2708 seq_printf(m
, "\treference count:\t%d\n", pd
->refcnt
);
2709 seq_printf(m
, "\tflags:\t\t\t0x%lx\n", pd
->flags
);
2710 seq_printf(m
, "\tread speed:\t\t%ukB/s\n", pd
->read_speed
);
2711 seq_printf(m
, "\twrite speed:\t\t%ukB/s\n", pd
->write_speed
);
2712 seq_printf(m
, "\tstart offset:\t\t%lu\n", pd
->offset
);
2713 seq_printf(m
, "\tmode page offset:\t%u\n", pd
->mode_offset
);
2715 seq_printf(m
, "\nQueue state:\n");
2716 seq_printf(m
, "\tbios queued:\t\t%d\n", pd
->bio_queue_size
);
2717 seq_printf(m
, "\tbios pending:\t\t%d\n", atomic_read(&pd
->cdrw
.pending_bios
));
2718 seq_printf(m
, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd
->current_sector
);
2720 pkt_count_states(pd
, states
);
2721 seq_printf(m
, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2722 states
[0], states
[1], states
[2], states
[3], states
[4], states
[5]);
2724 seq_printf(m
, "\twrite congestion marks:\toff=%d on=%d\n",
2725 pd
->write_congestion_off
,
2726 pd
->write_congestion_on
);
2730 static int pkt_seq_open(struct inode
*inode
, struct file
*file
)
2732 return single_open(file
, pkt_seq_show
, PDE(inode
)->data
);
2735 static const struct file_operations pkt_proc_fops
= {
2736 .open
= pkt_seq_open
,
2738 .llseek
= seq_lseek
,
2739 .release
= single_release
2742 static int pkt_new_dev(struct pktcdvd_device
*pd
, dev_t dev
)
2746 char b
[BDEVNAME_SIZE
];
2747 struct block_device
*bdev
;
2749 if (pd
->pkt_dev
== dev
) {
2750 printk(DRIVER_NAME
": Recursive setup not allowed\n");
2753 for (i
= 0; i
< MAX_WRITERS
; i
++) {
2754 struct pktcdvd_device
*pd2
= pkt_devs
[i
];
2757 if (pd2
->bdev
->bd_dev
== dev
) {
2758 printk(DRIVER_NAME
": %s already setup\n", bdevname(pd2
->bdev
, b
));
2761 if (pd2
->pkt_dev
== dev
) {
2762 printk(DRIVER_NAME
": Can't chain pktcdvd devices\n");
2770 ret
= blkdev_get(bdev
, FMODE_READ
| FMODE_NDELAY
);
2774 /* This is safe, since we have a reference from open(). */
2775 __module_get(THIS_MODULE
);
2778 set_blocksize(bdev
, CD_FRAMESIZE
);
2782 atomic_set(&pd
->cdrw
.pending_bios
, 0);
2783 pd
->cdrw
.thread
= kthread_run(kcdrwd
, pd
, "%s", pd
->name
);
2784 if (IS_ERR(pd
->cdrw
.thread
)) {
2785 printk(DRIVER_NAME
": can't start kernel thread\n");
2790 proc_create_data(pd
->name
, 0, pkt_proc
, &pkt_proc_fops
, pd
);
2791 DPRINTK(DRIVER_NAME
": writer %s mapped to %s\n", pd
->name
, bdevname(bdev
, b
));
2795 blkdev_put(bdev
, FMODE_READ
| FMODE_NDELAY
);
2796 /* This is safe: open() is still holding a reference. */
2797 module_put(THIS_MODULE
);
2801 static int pkt_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
, unsigned long arg
)
2803 struct pktcdvd_device
*pd
= bdev
->bd_disk
->private_data
;
2805 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd
,
2806 MAJOR(bdev
->bd_dev
), MINOR(bdev
->bd_dev
));
2811 * The door gets locked when the device is opened, so we
2812 * have to unlock it or else the eject command fails.
2814 if (pd
->refcnt
== 1)
2815 pkt_lock_door(pd
, 0);
2818 * forward selected CDROM ioctls to CD-ROM, for UDF
2820 case CDROMMULTISESSION
:
2821 case CDROMREADTOCENTRY
:
2822 case CDROM_LAST_WRITTEN
:
2823 case CDROM_SEND_PACKET
:
2824 case SCSI_IOCTL_SEND_COMMAND
:
2825 return __blkdev_driver_ioctl(pd
->bdev
, mode
, cmd
, arg
);
2828 VPRINTK(DRIVER_NAME
": Unknown ioctl for %s (%x)\n", pd
->name
, cmd
);
2835 static int pkt_media_changed(struct gendisk
*disk
)
2837 struct pktcdvd_device
*pd
= disk
->private_data
;
2838 struct gendisk
*attached_disk
;
2844 attached_disk
= pd
->bdev
->bd_disk
;
2847 return attached_disk
->fops
->media_changed(attached_disk
);
2850 static struct block_device_operations pktcdvd_ops
= {
2851 .owner
= THIS_MODULE
,
2853 .release
= pkt_close
,
2854 .locked_ioctl
= pkt_ioctl
,
2855 .media_changed
= pkt_media_changed
,
2859 * Set up mapping from pktcdvd device to CD-ROM device.
2861 static int pkt_setup_dev(dev_t dev
, dev_t
* pkt_dev
)
2865 struct pktcdvd_device
*pd
;
2866 struct gendisk
*disk
;
2868 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2870 for (idx
= 0; idx
< MAX_WRITERS
; idx
++)
2873 if (idx
== MAX_WRITERS
) {
2874 printk(DRIVER_NAME
": max %d writers supported\n", MAX_WRITERS
);
2879 pd
= kzalloc(sizeof(struct pktcdvd_device
), GFP_KERNEL
);
2883 pd
->rb_pool
= mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE
,
2884 sizeof(struct pkt_rb_node
));
2888 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
2889 INIT_LIST_HEAD(&pd
->cdrw
.pkt_active_list
);
2890 spin_lock_init(&pd
->cdrw
.active_list_lock
);
2892 spin_lock_init(&pd
->lock
);
2893 spin_lock_init(&pd
->iosched
.lock
);
2894 sprintf(pd
->name
, DRIVER_NAME
"%d", idx
);
2895 init_waitqueue_head(&pd
->wqueue
);
2896 pd
->bio_queue
= RB_ROOT
;
2898 pd
->write_congestion_on
= write_congestion_on
;
2899 pd
->write_congestion_off
= write_congestion_off
;
2901 disk
= alloc_disk(1);
2905 disk
->major
= pktdev_major
;
2906 disk
->first_minor
= idx
;
2907 disk
->fops
= &pktcdvd_ops
;
2908 disk
->flags
= GENHD_FL_REMOVABLE
;
2909 strcpy(disk
->disk_name
, pd
->name
);
2910 disk
->private_data
= pd
;
2911 disk
->queue
= blk_alloc_queue(GFP_KERNEL
);
2915 pd
->pkt_dev
= MKDEV(pktdev_major
, idx
);
2916 ret
= pkt_new_dev(pd
, dev
);
2922 pkt_sysfs_dev_new(pd
);
2923 pkt_debugfs_dev_new(pd
);
2927 *pkt_dev
= pd
->pkt_dev
;
2929 mutex_unlock(&ctl_mutex
);
2933 blk_cleanup_queue(disk
->queue
);
2938 mempool_destroy(pd
->rb_pool
);
2941 mutex_unlock(&ctl_mutex
);
2942 printk(DRIVER_NAME
": setup of pktcdvd device failed\n");
2947 * Tear down mapping from pktcdvd device to CD-ROM device.
2949 static int pkt_remove_dev(dev_t pkt_dev
)
2951 struct pktcdvd_device
*pd
;
2955 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2957 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
2959 if (pd
&& (pd
->pkt_dev
== pkt_dev
))
2962 if (idx
== MAX_WRITERS
) {
2963 DPRINTK(DRIVER_NAME
": dev not setup\n");
2968 if (pd
->refcnt
> 0) {
2972 if (!IS_ERR(pd
->cdrw
.thread
))
2973 kthread_stop(pd
->cdrw
.thread
);
2975 pkt_devs
[idx
] = NULL
;
2977 pkt_debugfs_dev_remove(pd
);
2978 pkt_sysfs_dev_remove(pd
);
2980 blkdev_put(pd
->bdev
, FMODE_READ
| FMODE_NDELAY
);
2982 remove_proc_entry(pd
->name
, pkt_proc
);
2983 DPRINTK(DRIVER_NAME
": writer %s unmapped\n", pd
->name
);
2985 del_gendisk(pd
->disk
);
2986 blk_cleanup_queue(pd
->disk
->queue
);
2989 mempool_destroy(pd
->rb_pool
);
2992 /* This is safe: open() is still holding a reference. */
2993 module_put(THIS_MODULE
);
2996 mutex_unlock(&ctl_mutex
);
3000 static void pkt_get_status(struct pkt_ctrl_command
*ctrl_cmd
)
3002 struct pktcdvd_device
*pd
;
3004 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
3006 pd
= pkt_find_dev_from_minor(ctrl_cmd
->dev_index
);
3008 ctrl_cmd
->dev
= new_encode_dev(pd
->bdev
->bd_dev
);
3009 ctrl_cmd
->pkt_dev
= new_encode_dev(pd
->pkt_dev
);
3012 ctrl_cmd
->pkt_dev
= 0;
3014 ctrl_cmd
->num_devices
= MAX_WRITERS
;
3016 mutex_unlock(&ctl_mutex
);
3019 static int pkt_ctl_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
3021 void __user
*argp
= (void __user
*)arg
;
3022 struct pkt_ctrl_command ctrl_cmd
;
3026 if (cmd
!= PACKET_CTRL_CMD
)
3029 if (copy_from_user(&ctrl_cmd
, argp
, sizeof(struct pkt_ctrl_command
)))
3032 switch (ctrl_cmd
.command
) {
3033 case PKT_CTRL_CMD_SETUP
:
3034 if (!capable(CAP_SYS_ADMIN
))
3036 ret
= pkt_setup_dev(new_decode_dev(ctrl_cmd
.dev
), &pkt_dev
);
3037 ctrl_cmd
.pkt_dev
= new_encode_dev(pkt_dev
);
3039 case PKT_CTRL_CMD_TEARDOWN
:
3040 if (!capable(CAP_SYS_ADMIN
))
3042 ret
= pkt_remove_dev(new_decode_dev(ctrl_cmd
.pkt_dev
));
3044 case PKT_CTRL_CMD_STATUS
:
3045 pkt_get_status(&ctrl_cmd
);
3051 if (copy_to_user(argp
, &ctrl_cmd
, sizeof(struct pkt_ctrl_command
)))
3057 static const struct file_operations pkt_ctl_fops
= {
3058 .ioctl
= pkt_ctl_ioctl
,
3059 .owner
= THIS_MODULE
,
3062 static struct miscdevice pkt_misc
= {
3063 .minor
= MISC_DYNAMIC_MINOR
,
3064 .name
= DRIVER_NAME
,
3065 .fops
= &pkt_ctl_fops
3068 static int __init
pkt_init(void)
3072 mutex_init(&ctl_mutex
);
3074 psd_pool
= mempool_create_kmalloc_pool(PSD_POOL_SIZE
,
3075 sizeof(struct packet_stacked_data
));
3079 ret
= register_blkdev(pktdev_major
, DRIVER_NAME
);
3081 printk(DRIVER_NAME
": Unable to register block device\n");
3087 ret
= pkt_sysfs_init();
3093 ret
= misc_register(&pkt_misc
);
3095 printk(DRIVER_NAME
": Unable to register misc device\n");
3099 pkt_proc
= proc_mkdir("driver/"DRIVER_NAME
, NULL
);
3104 pkt_debugfs_cleanup();
3105 pkt_sysfs_cleanup();
3107 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3109 mempool_destroy(psd_pool
);
3113 static void __exit
pkt_exit(void)
3115 remove_proc_entry("driver/"DRIVER_NAME
, NULL
);
3116 misc_deregister(&pkt_misc
);
3118 pkt_debugfs_cleanup();
3119 pkt_sysfs_cleanup();
3121 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3122 mempool_destroy(psd_pool
);
3125 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3126 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3127 MODULE_LICENSE("GPL");
3129 module_init(pkt_init
);
3130 module_exit(pkt_exit
);