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
;
113 p
= kzalloc(sizeof(*p
), GFP_KERNEL
);
116 kobject_set_name(&p
->kobj
, "%s", name
);
117 p
->kobj
.parent
= parent
;
118 p
->kobj
.ktype
= ktype
;
120 if (kobject_register(&p
->kobj
) != 0)
125 * remove a pktcdvd kernel object.
127 static void pkt_kobj_remove(struct pktcdvd_kobj
*p
)
130 kobject_unregister(&p
->kobj
);
133 * default release function for pktcdvd kernel objects.
135 static void pkt_kobj_release(struct kobject
*kobj
)
137 kfree(to_pktcdvdkobj(kobj
));
141 /**********************************************************
143 * sysfs interface for pktcdvd
144 * by (C) 2006 Thomas Maier <balagi@justmail.de>
146 **********************************************************/
148 #define DEF_ATTR(_obj,_name,_mode) \
149 static struct attribute _obj = { .name = _name, .mode = _mode }
151 /**********************************************************
152 /sys/class/pktcdvd/pktcdvd[0-7]/
155 stat/packets_finished
160 write_queue/congestion_off
161 write_queue/congestion_on
162 **********************************************************/
164 DEF_ATTR(kobj_pkt_attr_st1
, "reset", 0200);
165 DEF_ATTR(kobj_pkt_attr_st2
, "packets_started", 0444);
166 DEF_ATTR(kobj_pkt_attr_st3
, "packets_finished", 0444);
167 DEF_ATTR(kobj_pkt_attr_st4
, "kb_written", 0444);
168 DEF_ATTR(kobj_pkt_attr_st5
, "kb_read", 0444);
169 DEF_ATTR(kobj_pkt_attr_st6
, "kb_read_gather", 0444);
171 static struct attribute
*kobj_pkt_attrs_stat
[] = {
181 DEF_ATTR(kobj_pkt_attr_wq1
, "size", 0444);
182 DEF_ATTR(kobj_pkt_attr_wq2
, "congestion_off", 0644);
183 DEF_ATTR(kobj_pkt_attr_wq3
, "congestion_on", 0644);
185 static struct attribute
*kobj_pkt_attrs_wqueue
[] = {
192 static ssize_t
kobj_pkt_show(struct kobject
*kobj
,
193 struct attribute
*attr
, char *data
)
195 struct pktcdvd_device
*pd
= to_pktcdvdkobj(kobj
)->pd
;
198 if (strcmp(attr
->name
, "packets_started") == 0) {
199 n
= sprintf(data
, "%lu\n", pd
->stats
.pkt_started
);
201 } else if (strcmp(attr
->name
, "packets_finished") == 0) {
202 n
= sprintf(data
, "%lu\n", pd
->stats
.pkt_ended
);
204 } else if (strcmp(attr
->name
, "kb_written") == 0) {
205 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_w
>> 1);
207 } else if (strcmp(attr
->name
, "kb_read") == 0) {
208 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_r
>> 1);
210 } else if (strcmp(attr
->name
, "kb_read_gather") == 0) {
211 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_rg
>> 1);
213 } else if (strcmp(attr
->name
, "size") == 0) {
214 spin_lock(&pd
->lock
);
215 v
= pd
->bio_queue_size
;
216 spin_unlock(&pd
->lock
);
217 n
= sprintf(data
, "%d\n", v
);
219 } else if (strcmp(attr
->name
, "congestion_off") == 0) {
220 spin_lock(&pd
->lock
);
221 v
= pd
->write_congestion_off
;
222 spin_unlock(&pd
->lock
);
223 n
= sprintf(data
, "%d\n", v
);
225 } else if (strcmp(attr
->name
, "congestion_on") == 0) {
226 spin_lock(&pd
->lock
);
227 v
= pd
->write_congestion_on
;
228 spin_unlock(&pd
->lock
);
229 n
= sprintf(data
, "%d\n", v
);
234 static void init_write_congestion_marks(int* lo
, int* hi
)
238 *hi
= min(*hi
, 1000000);
242 *lo
= min(*lo
, *hi
- 100);
251 static ssize_t
kobj_pkt_store(struct kobject
*kobj
,
252 struct attribute
*attr
,
253 const char *data
, size_t len
)
255 struct pktcdvd_device
*pd
= to_pktcdvdkobj(kobj
)->pd
;
258 if (strcmp(attr
->name
, "reset") == 0 && len
> 0) {
259 pd
->stats
.pkt_started
= 0;
260 pd
->stats
.pkt_ended
= 0;
261 pd
->stats
.secs_w
= 0;
262 pd
->stats
.secs_rg
= 0;
263 pd
->stats
.secs_r
= 0;
265 } else if (strcmp(attr
->name
, "congestion_off") == 0
266 && sscanf(data
, "%d", &val
) == 1) {
267 spin_lock(&pd
->lock
);
268 pd
->write_congestion_off
= val
;
269 init_write_congestion_marks(&pd
->write_congestion_off
,
270 &pd
->write_congestion_on
);
271 spin_unlock(&pd
->lock
);
273 } else if (strcmp(attr
->name
, "congestion_on") == 0
274 && sscanf(data
, "%d", &val
) == 1) {
275 spin_lock(&pd
->lock
);
276 pd
->write_congestion_on
= val
;
277 init_write_congestion_marks(&pd
->write_congestion_off
,
278 &pd
->write_congestion_on
);
279 spin_unlock(&pd
->lock
);
284 static struct sysfs_ops kobj_pkt_ops
= {
285 .show
= kobj_pkt_show
,
286 .store
= kobj_pkt_store
288 static struct kobj_type kobj_pkt_type_stat
= {
289 .release
= pkt_kobj_release
,
290 .sysfs_ops
= &kobj_pkt_ops
,
291 .default_attrs
= kobj_pkt_attrs_stat
293 static struct kobj_type kobj_pkt_type_wqueue
= {
294 .release
= pkt_kobj_release
,
295 .sysfs_ops
= &kobj_pkt_ops
,
296 .default_attrs
= kobj_pkt_attrs_wqueue
299 static void pkt_sysfs_dev_new(struct pktcdvd_device
*pd
)
302 pd
->clsdev
= class_device_create(class_pktcdvd
,
304 NULL
, "%s", pd
->name
);
305 if (IS_ERR(pd
->clsdev
))
309 pd
->kobj_stat
= pkt_kobj_create(pd
, "stat",
311 &kobj_pkt_type_stat
);
312 pd
->kobj_wqueue
= pkt_kobj_create(pd
, "write_queue",
314 &kobj_pkt_type_wqueue
);
318 static void pkt_sysfs_dev_remove(struct pktcdvd_device
*pd
)
320 pkt_kobj_remove(pd
->kobj_stat
);
321 pkt_kobj_remove(pd
->kobj_wqueue
);
323 class_device_destroy(class_pktcdvd
, pd
->pkt_dev
);
327 /********************************************************************
330 remove unmap packet dev
331 device_map show mappings
332 *******************************************************************/
334 static void class_pktcdvd_release(struct class *cls
)
338 static ssize_t
class_pktcdvd_show_map(struct class *c
, char *data
)
342 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
343 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
344 struct pktcdvd_device
*pd
= pkt_devs
[idx
];
347 n
+= sprintf(data
+n
, "%s %u:%u %u:%u\n",
349 MAJOR(pd
->pkt_dev
), MINOR(pd
->pkt_dev
),
350 MAJOR(pd
->bdev
->bd_dev
),
351 MINOR(pd
->bdev
->bd_dev
));
353 mutex_unlock(&ctl_mutex
);
357 static ssize_t
class_pktcdvd_store_add(struct class *c
, const char *buf
,
360 unsigned int major
, minor
;
362 if (sscanf(buf
, "%u:%u", &major
, &minor
) == 2) {
363 /* pkt_setup_dev() expects caller to hold reference to self */
364 if (!try_module_get(THIS_MODULE
))
367 pkt_setup_dev(MKDEV(major
, minor
), NULL
);
369 module_put(THIS_MODULE
);
377 static ssize_t
class_pktcdvd_store_remove(struct class *c
, const char *buf
,
380 unsigned int major
, minor
;
381 if (sscanf(buf
, "%u:%u", &major
, &minor
) == 2) {
382 pkt_remove_dev(MKDEV(major
, minor
));
388 static struct class_attribute class_pktcdvd_attrs
[] = {
389 __ATTR(add
, 0200, NULL
, class_pktcdvd_store_add
),
390 __ATTR(remove
, 0200, NULL
, class_pktcdvd_store_remove
),
391 __ATTR(device_map
, 0444, class_pktcdvd_show_map
, NULL
),
396 static int pkt_sysfs_init(void)
401 * create control files in sysfs
402 * /sys/class/pktcdvd/...
404 class_pktcdvd
= kzalloc(sizeof(*class_pktcdvd
), GFP_KERNEL
);
407 class_pktcdvd
->name
= DRIVER_NAME
;
408 class_pktcdvd
->owner
= THIS_MODULE
;
409 class_pktcdvd
->class_release
= class_pktcdvd_release
;
410 class_pktcdvd
->class_attrs
= class_pktcdvd_attrs
;
411 ret
= class_register(class_pktcdvd
);
413 kfree(class_pktcdvd
);
414 class_pktcdvd
= NULL
;
415 printk(DRIVER_NAME
": failed to create class pktcdvd\n");
421 static void pkt_sysfs_cleanup(void)
424 class_destroy(class_pktcdvd
);
425 class_pktcdvd
= NULL
;
428 /********************************************************************
431 /debugfs/pktcdvd[0-7]/
434 *******************************************************************/
436 static int pkt_debugfs_seq_show(struct seq_file
*m
, void *p
)
438 return pkt_seq_show(m
, p
);
441 static int pkt_debugfs_fops_open(struct inode
*inode
, struct file
*file
)
443 return single_open(file
, pkt_debugfs_seq_show
, inode
->i_private
);
446 static const struct file_operations debug_fops
= {
447 .open
= pkt_debugfs_fops_open
,
450 .release
= single_release
,
451 .owner
= THIS_MODULE
,
454 static void pkt_debugfs_dev_new(struct pktcdvd_device
*pd
)
456 if (!pkt_debugfs_root
)
458 pd
->dfs_f_info
= NULL
;
459 pd
->dfs_d_root
= debugfs_create_dir(pd
->name
, pkt_debugfs_root
);
460 if (IS_ERR(pd
->dfs_d_root
)) {
461 pd
->dfs_d_root
= NULL
;
464 pd
->dfs_f_info
= debugfs_create_file("info", S_IRUGO
,
465 pd
->dfs_d_root
, pd
, &debug_fops
);
466 if (IS_ERR(pd
->dfs_f_info
)) {
467 pd
->dfs_f_info
= NULL
;
472 static void pkt_debugfs_dev_remove(struct pktcdvd_device
*pd
)
474 if (!pkt_debugfs_root
)
477 debugfs_remove(pd
->dfs_f_info
);
478 pd
->dfs_f_info
= NULL
;
480 debugfs_remove(pd
->dfs_d_root
);
481 pd
->dfs_d_root
= NULL
;
484 static void pkt_debugfs_init(void)
486 pkt_debugfs_root
= debugfs_create_dir(DRIVER_NAME
, NULL
);
487 if (IS_ERR(pkt_debugfs_root
)) {
488 pkt_debugfs_root
= NULL
;
493 static void pkt_debugfs_cleanup(void)
495 if (!pkt_debugfs_root
)
497 debugfs_remove(pkt_debugfs_root
);
498 pkt_debugfs_root
= NULL
;
501 /* ----------------------------------------------------------*/
504 static void pkt_bio_finished(struct pktcdvd_device
*pd
)
506 BUG_ON(atomic_read(&pd
->cdrw
.pending_bios
) <= 0);
507 if (atomic_dec_and_test(&pd
->cdrw
.pending_bios
)) {
508 VPRINTK(DRIVER_NAME
": queue empty\n");
509 atomic_set(&pd
->iosched
.attention
, 1);
510 wake_up(&pd
->wqueue
);
514 static void pkt_bio_destructor(struct bio
*bio
)
516 kfree(bio
->bi_io_vec
);
520 static struct bio
*pkt_bio_alloc(int nr_iovecs
)
522 struct bio_vec
*bvl
= NULL
;
525 bio
= kmalloc(sizeof(struct bio
), GFP_KERNEL
);
530 bvl
= kcalloc(nr_iovecs
, sizeof(struct bio_vec
), GFP_KERNEL
);
534 bio
->bi_max_vecs
= nr_iovecs
;
535 bio
->bi_io_vec
= bvl
;
536 bio
->bi_destructor
= pkt_bio_destructor
;
547 * Allocate a packet_data struct
549 static struct packet_data
*pkt_alloc_packet_data(int frames
)
552 struct packet_data
*pkt
;
554 pkt
= kzalloc(sizeof(struct packet_data
), GFP_KERNEL
);
558 pkt
->frames
= frames
;
559 pkt
->w_bio
= pkt_bio_alloc(frames
);
563 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++) {
564 pkt
->pages
[i
] = alloc_page(GFP_KERNEL
|__GFP_ZERO
);
569 spin_lock_init(&pkt
->lock
);
571 for (i
= 0; i
< frames
; i
++) {
572 struct bio
*bio
= pkt_bio_alloc(1);
575 pkt
->r_bios
[i
] = bio
;
581 for (i
= 0; i
< frames
; i
++) {
582 struct bio
*bio
= pkt
->r_bios
[i
];
588 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++)
590 __free_page(pkt
->pages
[i
]);
599 * Free a packet_data struct
601 static void pkt_free_packet_data(struct packet_data
*pkt
)
605 for (i
= 0; i
< pkt
->frames
; i
++) {
606 struct bio
*bio
= pkt
->r_bios
[i
];
610 for (i
= 0; i
< pkt
->frames
/ FRAMES_PER_PAGE
; i
++)
611 __free_page(pkt
->pages
[i
]);
616 static void pkt_shrink_pktlist(struct pktcdvd_device
*pd
)
618 struct packet_data
*pkt
, *next
;
620 BUG_ON(!list_empty(&pd
->cdrw
.pkt_active_list
));
622 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_free_list
, list
) {
623 pkt_free_packet_data(pkt
);
625 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
628 static int pkt_grow_pktlist(struct pktcdvd_device
*pd
, int nr_packets
)
630 struct packet_data
*pkt
;
632 BUG_ON(!list_empty(&pd
->cdrw
.pkt_free_list
));
634 while (nr_packets
> 0) {
635 pkt
= pkt_alloc_packet_data(pd
->settings
.size
>> 2);
637 pkt_shrink_pktlist(pd
);
640 pkt
->id
= nr_packets
;
642 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
648 static inline struct pkt_rb_node
*pkt_rbtree_next(struct pkt_rb_node
*node
)
650 struct rb_node
*n
= rb_next(&node
->rb_node
);
653 return rb_entry(n
, struct pkt_rb_node
, rb_node
);
656 static void pkt_rbtree_erase(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
658 rb_erase(&node
->rb_node
, &pd
->bio_queue
);
659 mempool_free(node
, pd
->rb_pool
);
660 pd
->bio_queue_size
--;
661 BUG_ON(pd
->bio_queue_size
< 0);
665 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
667 static struct pkt_rb_node
*pkt_rbtree_find(struct pktcdvd_device
*pd
, sector_t s
)
669 struct rb_node
*n
= pd
->bio_queue
.rb_node
;
670 struct rb_node
*next
;
671 struct pkt_rb_node
*tmp
;
674 BUG_ON(pd
->bio_queue_size
> 0);
679 tmp
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
680 if (s
<= tmp
->bio
->bi_sector
)
689 if (s
> tmp
->bio
->bi_sector
) {
690 tmp
= pkt_rbtree_next(tmp
);
694 BUG_ON(s
> tmp
->bio
->bi_sector
);
699 * Insert a node into the pd->bio_queue rb tree.
701 static void pkt_rbtree_insert(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
703 struct rb_node
**p
= &pd
->bio_queue
.rb_node
;
704 struct rb_node
*parent
= NULL
;
705 sector_t s
= node
->bio
->bi_sector
;
706 struct pkt_rb_node
*tmp
;
710 tmp
= rb_entry(parent
, struct pkt_rb_node
, rb_node
);
711 if (s
< tmp
->bio
->bi_sector
)
716 rb_link_node(&node
->rb_node
, parent
, p
);
717 rb_insert_color(&node
->rb_node
, &pd
->bio_queue
);
718 pd
->bio_queue_size
++;
722 * Add a bio to a single linked list defined by its head and tail pointers.
724 static void pkt_add_list_last(struct bio
*bio
, struct bio
**list_head
, struct bio
**list_tail
)
728 BUG_ON((*list_head
) == NULL
);
729 (*list_tail
)->bi_next
= bio
;
732 BUG_ON((*list_head
) != NULL
);
739 * Remove and return the first bio from a single linked list defined by its
740 * head and tail pointers.
742 static inline struct bio
*pkt_get_list_first(struct bio
**list_head
, struct bio
**list_tail
)
746 if (*list_head
== NULL
)
750 *list_head
= bio
->bi_next
;
751 if (*list_head
== NULL
)
759 * Send a packet_command to the underlying block device and
760 * wait for completion.
762 static int pkt_generic_packet(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
764 struct request_queue
*q
= bdev_get_queue(pd
->bdev
);
768 rq
= blk_get_request(q
, (cgc
->data_direction
== CGC_DATA_WRITE
) ?
769 WRITE
: READ
, __GFP_WAIT
);
772 if (blk_rq_map_kern(q
, rq
, cgc
->buffer
, cgc
->buflen
, __GFP_WAIT
))
776 rq
->cmd_len
= COMMAND_SIZE(cgc
->cmd
[0]);
777 memcpy(rq
->cmd
, cgc
->cmd
, CDROM_PACKET_SIZE
);
778 if (sizeof(rq
->cmd
) > CDROM_PACKET_SIZE
)
779 memset(rq
->cmd
+ CDROM_PACKET_SIZE
, 0, sizeof(rq
->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 int pkt_set_speed(struct pktcdvd_device
*pd
, unsigned write_speed
, unsigned read_speed
)
853 struct packet_command cgc
;
854 struct request_sense sense
;
857 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
859 cgc
.cmd
[0] = GPCMD_SET_SPEED
;
860 cgc
.cmd
[2] = (read_speed
>> 8) & 0xff;
861 cgc
.cmd
[3] = read_speed
& 0xff;
862 cgc
.cmd
[4] = (write_speed
>> 8) & 0xff;
863 cgc
.cmd
[5] = write_speed
& 0xff;
865 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
866 pkt_dump_sense(&cgc
);
872 * Queue a bio for processing by the low-level CD device. Must be called
873 * from process context.
875 static void pkt_queue_bio(struct pktcdvd_device
*pd
, struct bio
*bio
)
877 spin_lock(&pd
->iosched
.lock
);
878 if (bio_data_dir(bio
) == READ
) {
879 pkt_add_list_last(bio
, &pd
->iosched
.read_queue
,
880 &pd
->iosched
.read_queue_tail
);
882 pkt_add_list_last(bio
, &pd
->iosched
.write_queue
,
883 &pd
->iosched
.write_queue_tail
);
885 spin_unlock(&pd
->iosched
.lock
);
887 atomic_set(&pd
->iosched
.attention
, 1);
888 wake_up(&pd
->wqueue
);
892 * Process the queued read/write requests. This function handles special
893 * requirements for CDRW drives:
894 * - A cache flush command must be inserted before a read request if the
895 * previous request was a write.
896 * - Switching between reading and writing is slow, so don't do it more often
898 * - Optimize for throughput at the expense of latency. This means that streaming
899 * writes will never be interrupted by a read, but if the drive has to seek
900 * before the next write, switch to reading instead if there are any pending
902 * - Set the read speed according to current usage pattern. When only reading
903 * from the device, it's best to use the highest possible read speed, but
904 * when switching often between reading and writing, it's better to have the
905 * same read and write speeds.
907 static void pkt_iosched_process_queue(struct pktcdvd_device
*pd
)
910 if (atomic_read(&pd
->iosched
.attention
) == 0)
912 atomic_set(&pd
->iosched
.attention
, 0);
916 int reads_queued
, writes_queued
;
918 spin_lock(&pd
->iosched
.lock
);
919 reads_queued
= (pd
->iosched
.read_queue
!= NULL
);
920 writes_queued
= (pd
->iosched
.write_queue
!= NULL
);
921 spin_unlock(&pd
->iosched
.lock
);
923 if (!reads_queued
&& !writes_queued
)
926 if (pd
->iosched
.writing
) {
927 int need_write_seek
= 1;
928 spin_lock(&pd
->iosched
.lock
);
929 bio
= pd
->iosched
.write_queue
;
930 spin_unlock(&pd
->iosched
.lock
);
931 if (bio
&& (bio
->bi_sector
== pd
->iosched
.last_write
))
933 if (need_write_seek
&& reads_queued
) {
934 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
935 VPRINTK(DRIVER_NAME
": write, waiting\n");
939 pd
->iosched
.writing
= 0;
942 if (!reads_queued
&& writes_queued
) {
943 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
944 VPRINTK(DRIVER_NAME
": read, waiting\n");
947 pd
->iosched
.writing
= 1;
951 spin_lock(&pd
->iosched
.lock
);
952 if (pd
->iosched
.writing
) {
953 bio
= pkt_get_list_first(&pd
->iosched
.write_queue
,
954 &pd
->iosched
.write_queue_tail
);
956 bio
= pkt_get_list_first(&pd
->iosched
.read_queue
,
957 &pd
->iosched
.read_queue_tail
);
959 spin_unlock(&pd
->iosched
.lock
);
964 if (bio_data_dir(bio
) == READ
)
965 pd
->iosched
.successive_reads
+= bio
->bi_size
>> 10;
967 pd
->iosched
.successive_reads
= 0;
968 pd
->iosched
.last_write
= bio
->bi_sector
+ bio_sectors(bio
);
970 if (pd
->iosched
.successive_reads
>= HI_SPEED_SWITCH
) {
971 if (pd
->read_speed
== pd
->write_speed
) {
972 pd
->read_speed
= MAX_SPEED
;
973 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
976 if (pd
->read_speed
!= pd
->write_speed
) {
977 pd
->read_speed
= pd
->write_speed
;
978 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
982 atomic_inc(&pd
->cdrw
.pending_bios
);
983 generic_make_request(bio
);
988 * Special care is needed if the underlying block device has a small
989 * max_phys_segments value.
991 static int pkt_set_segment_merging(struct pktcdvd_device
*pd
, struct request_queue
*q
)
993 if ((pd
->settings
.size
<< 9) / CD_FRAMESIZE
<= q
->max_phys_segments
) {
995 * The cdrom device can handle one segment/frame
997 clear_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
999 } else if ((pd
->settings
.size
<< 9) / PAGE_SIZE
<= q
->max_phys_segments
) {
1001 * We can handle this case at the expense of some extra memory
1002 * copies during write operations
1004 set_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
1007 printk(DRIVER_NAME
": cdrom max_phys_segments too small\n");
1013 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
1015 static void pkt_copy_bio_data(struct bio
*src_bio
, int seg
, int offs
, struct page
*dst_page
, int dst_offs
)
1017 unsigned int copy_size
= CD_FRAMESIZE
;
1019 while (copy_size
> 0) {
1020 struct bio_vec
*src_bvl
= bio_iovec_idx(src_bio
, seg
);
1021 void *vfrom
= kmap_atomic(src_bvl
->bv_page
, KM_USER0
) +
1022 src_bvl
->bv_offset
+ offs
;
1023 void *vto
= page_address(dst_page
) + dst_offs
;
1024 int len
= min_t(int, copy_size
, src_bvl
->bv_len
- offs
);
1027 memcpy(vto
, vfrom
, len
);
1028 kunmap_atomic(vfrom
, KM_USER0
);
1038 * Copy all data for this packet to pkt->pages[], so that
1039 * a) The number of required segments for the write bio is minimized, which
1040 * is necessary for some scsi controllers.
1041 * b) The data can be used as cache to avoid read requests if we receive a
1042 * new write request for the same zone.
1044 static void pkt_make_local_copy(struct packet_data
*pkt
, struct bio_vec
*bvec
)
1048 /* Copy all data to pkt->pages[] */
1051 for (f
= 0; f
< pkt
->frames
; f
++) {
1052 if (bvec
[f
].bv_page
!= pkt
->pages
[p
]) {
1053 void *vfrom
= kmap_atomic(bvec
[f
].bv_page
, KM_USER0
) + bvec
[f
].bv_offset
;
1054 void *vto
= page_address(pkt
->pages
[p
]) + offs
;
1055 memcpy(vto
, vfrom
, CD_FRAMESIZE
);
1056 kunmap_atomic(vfrom
, KM_USER0
);
1057 bvec
[f
].bv_page
= pkt
->pages
[p
];
1058 bvec
[f
].bv_offset
= offs
;
1060 BUG_ON(bvec
[f
].bv_offset
!= offs
);
1062 offs
+= CD_FRAMESIZE
;
1063 if (offs
>= PAGE_SIZE
) {
1070 static void pkt_end_io_read(struct bio
*bio
, int err
)
1072 struct packet_data
*pkt
= bio
->bi_private
;
1073 struct pktcdvd_device
*pd
= pkt
->pd
;
1076 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio
,
1077 (unsigned long long)pkt
->sector
, (unsigned long long)bio
->bi_sector
, err
);
1080 atomic_inc(&pkt
->io_errors
);
1081 if (atomic_dec_and_test(&pkt
->io_wait
)) {
1082 atomic_inc(&pkt
->run_sm
);
1083 wake_up(&pd
->wqueue
);
1085 pkt_bio_finished(pd
);
1088 static void pkt_end_io_packet_write(struct bio
*bio
, int err
)
1090 struct packet_data
*pkt
= bio
->bi_private
;
1091 struct pktcdvd_device
*pd
= pkt
->pd
;
1094 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt
->id
, err
);
1096 pd
->stats
.pkt_ended
++;
1098 pkt_bio_finished(pd
);
1099 atomic_dec(&pkt
->io_wait
);
1100 atomic_inc(&pkt
->run_sm
);
1101 wake_up(&pd
->wqueue
);
1105 * Schedule reads for the holes in a packet
1107 static void pkt_gather_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1109 int frames_read
= 0;
1112 char written
[PACKET_MAX_SIZE
];
1114 BUG_ON(!pkt
->orig_bios
);
1116 atomic_set(&pkt
->io_wait
, 0);
1117 atomic_set(&pkt
->io_errors
, 0);
1120 * Figure out which frames we need to read before we can write.
1122 memset(written
, 0, sizeof(written
));
1123 spin_lock(&pkt
->lock
);
1124 for (bio
= pkt
->orig_bios
; bio
; bio
= bio
->bi_next
) {
1125 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1126 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1127 pd
->stats
.secs_w
+= num_frames
* (CD_FRAMESIZE
>> 9);
1128 BUG_ON(first_frame
< 0);
1129 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1130 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++)
1133 spin_unlock(&pkt
->lock
);
1135 if (pkt
->cache_valid
) {
1136 VPRINTK("pkt_gather_data: zone %llx cached\n",
1137 (unsigned long long)pkt
->sector
);
1142 * Schedule reads for missing parts of the packet.
1144 for (f
= 0; f
< pkt
->frames
; f
++) {
1145 struct bio_vec
*vec
;
1150 bio
= pkt
->r_bios
[f
];
1151 vec
= bio
->bi_io_vec
;
1153 bio
->bi_max_vecs
= 1;
1154 bio
->bi_sector
= pkt
->sector
+ f
* (CD_FRAMESIZE
>> 9);
1155 bio
->bi_bdev
= pd
->bdev
;
1156 bio
->bi_end_io
= pkt_end_io_read
;
1157 bio
->bi_private
= pkt
;
1158 bio
->bi_io_vec
= vec
;
1159 bio
->bi_destructor
= pkt_bio_destructor
;
1161 p
= (f
* CD_FRAMESIZE
) / PAGE_SIZE
;
1162 offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1163 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1164 f
, pkt
->pages
[p
], offset
);
1165 if (!bio_add_page(bio
, pkt
->pages
[p
], CD_FRAMESIZE
, offset
))
1168 atomic_inc(&pkt
->io_wait
);
1170 pkt_queue_bio(pd
, bio
);
1175 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1176 frames_read
, (unsigned long long)pkt
->sector
);
1177 pd
->stats
.pkt_started
++;
1178 pd
->stats
.secs_rg
+= frames_read
* (CD_FRAMESIZE
>> 9);
1182 * Find a packet matching zone, or the least recently used packet if
1183 * there is no match.
1185 static struct packet_data
*pkt_get_packet_data(struct pktcdvd_device
*pd
, int zone
)
1187 struct packet_data
*pkt
;
1189 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_free_list
, list
) {
1190 if (pkt
->sector
== zone
|| pkt
->list
.next
== &pd
->cdrw
.pkt_free_list
) {
1191 list_del_init(&pkt
->list
);
1192 if (pkt
->sector
!= zone
)
1193 pkt
->cache_valid
= 0;
1201 static void pkt_put_packet_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1203 if (pkt
->cache_valid
) {
1204 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1206 list_add_tail(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1211 * recover a failed write, query for relocation if possible
1213 * returns 1 if recovery is possible, or 0 if not
1216 static int pkt_start_recovery(struct packet_data
*pkt
)
1219 * FIXME. We need help from the file system to implement
1220 * recovery handling.
1224 struct request
*rq
= pkt
->rq
;
1225 struct pktcdvd_device
*pd
= rq
->rq_disk
->private_data
;
1226 struct block_device
*pkt_bdev
;
1227 struct super_block
*sb
= NULL
;
1228 unsigned long old_block
, new_block
;
1229 sector_t new_sector
;
1231 pkt_bdev
= bdget(kdev_t_to_nr(pd
->pkt_dev
));
1233 sb
= get_super(pkt_bdev
);
1240 if (!sb
->s_op
|| !sb
->s_op
->relocate_blocks
)
1243 old_block
= pkt
->sector
/ (CD_FRAMESIZE
>> 9);
1244 if (sb
->s_op
->relocate_blocks(sb
, old_block
, &new_block
))
1247 new_sector
= new_block
* (CD_FRAMESIZE
>> 9);
1248 pkt
->sector
= new_sector
;
1250 pkt
->bio
->bi_sector
= new_sector
;
1251 pkt
->bio
->bi_next
= NULL
;
1252 pkt
->bio
->bi_flags
= 1 << BIO_UPTODATE
;
1253 pkt
->bio
->bi_idx
= 0;
1255 BUG_ON(pkt
->bio
->bi_rw
!= (1 << BIO_RW
));
1256 BUG_ON(pkt
->bio
->bi_vcnt
!= pkt
->frames
);
1257 BUG_ON(pkt
->bio
->bi_size
!= pkt
->frames
* CD_FRAMESIZE
);
1258 BUG_ON(pkt
->bio
->bi_end_io
!= pkt_end_io_packet_write
);
1259 BUG_ON(pkt
->bio
->bi_private
!= pkt
);
1270 static inline void pkt_set_state(struct packet_data
*pkt
, enum packet_data_state state
)
1272 #if PACKET_DEBUG > 1
1273 static const char *state_name
[] = {
1274 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1276 enum packet_data_state old_state
= pkt
->state
;
1277 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt
->id
, (unsigned long long)pkt
->sector
,
1278 state_name
[old_state
], state_name
[state
]);
1284 * Scan the work queue to see if we can start a new packet.
1285 * returns non-zero if any work was done.
1287 static int pkt_handle_queue(struct pktcdvd_device
*pd
)
1289 struct packet_data
*pkt
, *p
;
1290 struct bio
*bio
= NULL
;
1291 sector_t zone
= 0; /* Suppress gcc warning */
1292 struct pkt_rb_node
*node
, *first_node
;
1296 VPRINTK("handle_queue\n");
1298 atomic_set(&pd
->scan_queue
, 0);
1300 if (list_empty(&pd
->cdrw
.pkt_free_list
)) {
1301 VPRINTK("handle_queue: no pkt\n");
1306 * Try to find a zone we are not already working on.
1308 spin_lock(&pd
->lock
);
1309 first_node
= pkt_rbtree_find(pd
, pd
->current_sector
);
1311 n
= rb_first(&pd
->bio_queue
);
1313 first_node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1318 zone
= ZONE(bio
->bi_sector
, pd
);
1319 list_for_each_entry(p
, &pd
->cdrw
.pkt_active_list
, list
) {
1320 if (p
->sector
== zone
) {
1327 node
= pkt_rbtree_next(node
);
1329 n
= rb_first(&pd
->bio_queue
);
1331 node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1333 if (node
== first_node
)
1336 spin_unlock(&pd
->lock
);
1338 VPRINTK("handle_queue: no bio\n");
1342 pkt
= pkt_get_packet_data(pd
, zone
);
1344 pd
->current_sector
= zone
+ pd
->settings
.size
;
1346 BUG_ON(pkt
->frames
!= pd
->settings
.size
>> 2);
1347 pkt
->write_size
= 0;
1350 * Scan work queue for bios in the same zone and link them
1353 spin_lock(&pd
->lock
);
1354 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone
);
1355 while ((node
= pkt_rbtree_find(pd
, zone
)) != NULL
) {
1357 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1358 (unsigned long long)ZONE(bio
->bi_sector
, pd
));
1359 if (ZONE(bio
->bi_sector
, pd
) != zone
)
1361 pkt_rbtree_erase(pd
, node
);
1362 spin_lock(&pkt
->lock
);
1363 pkt_add_list_last(bio
, &pkt
->orig_bios
, &pkt
->orig_bios_tail
);
1364 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
1365 spin_unlock(&pkt
->lock
);
1367 /* check write congestion marks, and if bio_queue_size is
1368 below, wake up any waiters */
1369 wakeup
= (pd
->write_congestion_on
> 0
1370 && pd
->bio_queue_size
<= pd
->write_congestion_off
);
1371 spin_unlock(&pd
->lock
);
1373 clear_bdi_congested(&pd
->disk
->queue
->backing_dev_info
, WRITE
);
1375 pkt
->sleep_time
= max(PACKET_WAIT_TIME
, 1);
1376 pkt_set_state(pkt
, PACKET_WAITING_STATE
);
1377 atomic_set(&pkt
->run_sm
, 1);
1379 spin_lock(&pd
->cdrw
.active_list_lock
);
1380 list_add(&pkt
->list
, &pd
->cdrw
.pkt_active_list
);
1381 spin_unlock(&pd
->cdrw
.active_list_lock
);
1387 * Assemble a bio to write one packet and queue the bio for processing
1388 * by the underlying block device.
1390 static void pkt_start_write(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1395 struct bio_vec
*bvec
= pkt
->w_bio
->bi_io_vec
;
1397 for (f
= 0; f
< pkt
->frames
; f
++) {
1398 bvec
[f
].bv_page
= pkt
->pages
[(f
* CD_FRAMESIZE
) / PAGE_SIZE
];
1399 bvec
[f
].bv_offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1403 * Fill-in bvec with data from orig_bios.
1406 spin_lock(&pkt
->lock
);
1407 for (bio
= pkt
->orig_bios
; bio
; bio
= bio
->bi_next
) {
1408 int segment
= bio
->bi_idx
;
1410 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1411 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1412 BUG_ON(first_frame
< 0);
1413 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1414 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++) {
1415 struct bio_vec
*src_bvl
= bio_iovec_idx(bio
, segment
);
1417 while (src_offs
>= src_bvl
->bv_len
) {
1418 src_offs
-= src_bvl
->bv_len
;
1420 BUG_ON(segment
>= bio
->bi_vcnt
);
1421 src_bvl
= bio_iovec_idx(bio
, segment
);
1424 if (src_bvl
->bv_len
- src_offs
>= CD_FRAMESIZE
) {
1425 bvec
[f
].bv_page
= src_bvl
->bv_page
;
1426 bvec
[f
].bv_offset
= src_bvl
->bv_offset
+ src_offs
;
1428 pkt_copy_bio_data(bio
, segment
, src_offs
,
1429 bvec
[f
].bv_page
, bvec
[f
].bv_offset
);
1431 src_offs
+= CD_FRAMESIZE
;
1435 pkt_set_state(pkt
, PACKET_WRITE_WAIT_STATE
);
1436 spin_unlock(&pkt
->lock
);
1438 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1439 frames_write
, (unsigned long long)pkt
->sector
);
1440 BUG_ON(frames_write
!= pkt
->write_size
);
1442 if (test_bit(PACKET_MERGE_SEGS
, &pd
->flags
) || (pkt
->write_size
< pkt
->frames
)) {
1443 pkt_make_local_copy(pkt
, bvec
);
1444 pkt
->cache_valid
= 1;
1446 pkt
->cache_valid
= 0;
1449 /* Start the write request */
1450 bio_init(pkt
->w_bio
);
1451 pkt
->w_bio
->bi_max_vecs
= PACKET_MAX_SIZE
;
1452 pkt
->w_bio
->bi_sector
= pkt
->sector
;
1453 pkt
->w_bio
->bi_bdev
= pd
->bdev
;
1454 pkt
->w_bio
->bi_end_io
= pkt_end_io_packet_write
;
1455 pkt
->w_bio
->bi_private
= pkt
;
1456 pkt
->w_bio
->bi_io_vec
= bvec
;
1457 pkt
->w_bio
->bi_destructor
= pkt_bio_destructor
;
1458 for (f
= 0; f
< pkt
->frames
; f
++)
1459 if (!bio_add_page(pkt
->w_bio
, bvec
[f
].bv_page
, CD_FRAMESIZE
, bvec
[f
].bv_offset
))
1461 VPRINTK(DRIVER_NAME
": vcnt=%d\n", pkt
->w_bio
->bi_vcnt
);
1463 atomic_set(&pkt
->io_wait
, 1);
1464 pkt
->w_bio
->bi_rw
= WRITE
;
1465 pkt_queue_bio(pd
, pkt
->w_bio
);
1468 static void pkt_finish_packet(struct packet_data
*pkt
, int uptodate
)
1470 struct bio
*bio
, *next
;
1473 pkt
->cache_valid
= 0;
1475 /* Finish all bios corresponding to this packet */
1476 bio
= pkt
->orig_bios
;
1478 next
= bio
->bi_next
;
1479 bio
->bi_next
= NULL
;
1480 bio_endio(bio
, uptodate
? 0 : -EIO
);
1483 pkt
->orig_bios
= pkt
->orig_bios_tail
= NULL
;
1486 static void pkt_run_state_machine(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1490 VPRINTK("run_state_machine: pkt %d\n", pkt
->id
);
1493 switch (pkt
->state
) {
1494 case PACKET_WAITING_STATE
:
1495 if ((pkt
->write_size
< pkt
->frames
) && (pkt
->sleep_time
> 0))
1498 pkt
->sleep_time
= 0;
1499 pkt_gather_data(pd
, pkt
);
1500 pkt_set_state(pkt
, PACKET_READ_WAIT_STATE
);
1503 case PACKET_READ_WAIT_STATE
:
1504 if (atomic_read(&pkt
->io_wait
) > 0)
1507 if (atomic_read(&pkt
->io_errors
) > 0) {
1508 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1510 pkt_start_write(pd
, pkt
);
1514 case PACKET_WRITE_WAIT_STATE
:
1515 if (atomic_read(&pkt
->io_wait
) > 0)
1518 if (test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
)) {
1519 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1521 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1525 case PACKET_RECOVERY_STATE
:
1526 if (pkt_start_recovery(pkt
)) {
1527 pkt_start_write(pd
, pkt
);
1529 VPRINTK("No recovery possible\n");
1530 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1534 case PACKET_FINISHED_STATE
:
1535 uptodate
= test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
);
1536 pkt_finish_packet(pkt
, uptodate
);
1546 static void pkt_handle_packets(struct pktcdvd_device
*pd
)
1548 struct packet_data
*pkt
, *next
;
1550 VPRINTK("pkt_handle_packets\n");
1553 * Run state machine for active packets
1555 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1556 if (atomic_read(&pkt
->run_sm
) > 0) {
1557 atomic_set(&pkt
->run_sm
, 0);
1558 pkt_run_state_machine(pd
, pkt
);
1563 * Move no longer active packets to the free list
1565 spin_lock(&pd
->cdrw
.active_list_lock
);
1566 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_active_list
, list
) {
1567 if (pkt
->state
== PACKET_FINISHED_STATE
) {
1568 list_del(&pkt
->list
);
1569 pkt_put_packet_data(pd
, pkt
);
1570 pkt_set_state(pkt
, PACKET_IDLE_STATE
);
1571 atomic_set(&pd
->scan_queue
, 1);
1574 spin_unlock(&pd
->cdrw
.active_list_lock
);
1577 static void pkt_count_states(struct pktcdvd_device
*pd
, int *states
)
1579 struct packet_data
*pkt
;
1582 for (i
= 0; i
< PACKET_NUM_STATES
; i
++)
1585 spin_lock(&pd
->cdrw
.active_list_lock
);
1586 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1587 states
[pkt
->state
]++;
1589 spin_unlock(&pd
->cdrw
.active_list_lock
);
1593 * kcdrwd is woken up when writes have been queued for one of our
1594 * registered devices
1596 static int kcdrwd(void *foobar
)
1598 struct pktcdvd_device
*pd
= foobar
;
1599 struct packet_data
*pkt
;
1600 long min_sleep_time
, residue
;
1602 set_user_nice(current
, -20);
1606 DECLARE_WAITQUEUE(wait
, current
);
1609 * Wait until there is something to do
1611 add_wait_queue(&pd
->wqueue
, &wait
);
1613 set_current_state(TASK_INTERRUPTIBLE
);
1615 /* Check if we need to run pkt_handle_queue */
1616 if (atomic_read(&pd
->scan_queue
) > 0)
1619 /* Check if we need to run the state machine for some packet */
1620 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1621 if (atomic_read(&pkt
->run_sm
) > 0)
1625 /* Check if we need to process the iosched queues */
1626 if (atomic_read(&pd
->iosched
.attention
) != 0)
1629 /* Otherwise, go to sleep */
1630 if (PACKET_DEBUG
> 1) {
1631 int states
[PACKET_NUM_STATES
];
1632 pkt_count_states(pd
, states
);
1633 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1634 states
[0], states
[1], states
[2], states
[3],
1635 states
[4], states
[5]);
1638 min_sleep_time
= MAX_SCHEDULE_TIMEOUT
;
1639 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1640 if (pkt
->sleep_time
&& pkt
->sleep_time
< min_sleep_time
)
1641 min_sleep_time
= pkt
->sleep_time
;
1644 generic_unplug_device(bdev_get_queue(pd
->bdev
));
1646 VPRINTK("kcdrwd: sleeping\n");
1647 residue
= schedule_timeout(min_sleep_time
);
1648 VPRINTK("kcdrwd: wake up\n");
1650 /* make swsusp happy with our thread */
1653 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1654 if (!pkt
->sleep_time
)
1656 pkt
->sleep_time
-= min_sleep_time
- residue
;
1657 if (pkt
->sleep_time
<= 0) {
1658 pkt
->sleep_time
= 0;
1659 atomic_inc(&pkt
->run_sm
);
1663 if (kthread_should_stop())
1667 set_current_state(TASK_RUNNING
);
1668 remove_wait_queue(&pd
->wqueue
, &wait
);
1670 if (kthread_should_stop())
1674 * if pkt_handle_queue returns true, we can queue
1677 while (pkt_handle_queue(pd
))
1681 * Handle packet state machine
1683 pkt_handle_packets(pd
);
1686 * Handle iosched queues
1688 pkt_iosched_process_queue(pd
);
1694 static void pkt_print_settings(struct pktcdvd_device
*pd
)
1696 printk(DRIVER_NAME
": %s packets, ", pd
->settings
.fp
? "Fixed" : "Variable");
1697 printk("%u blocks, ", pd
->settings
.size
>> 2);
1698 printk("Mode-%c disc\n", pd
->settings
.block_mode
== 8 ? '1' : '2');
1701 static int pkt_mode_sense(struct pktcdvd_device
*pd
, struct packet_command
*cgc
, int page_code
, int page_control
)
1703 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1705 cgc
->cmd
[0] = GPCMD_MODE_SENSE_10
;
1706 cgc
->cmd
[2] = page_code
| (page_control
<< 6);
1707 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1708 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1709 cgc
->data_direction
= CGC_DATA_READ
;
1710 return pkt_generic_packet(pd
, cgc
);
1713 static int pkt_mode_select(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
1715 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1716 memset(cgc
->buffer
, 0, 2);
1717 cgc
->cmd
[0] = GPCMD_MODE_SELECT_10
;
1718 cgc
->cmd
[1] = 0x10; /* PF */
1719 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1720 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1721 cgc
->data_direction
= CGC_DATA_WRITE
;
1722 return pkt_generic_packet(pd
, cgc
);
1725 static int pkt_get_disc_info(struct pktcdvd_device
*pd
, disc_information
*di
)
1727 struct packet_command cgc
;
1730 /* set up command and get the disc info */
1731 init_cdrom_command(&cgc
, di
, sizeof(*di
), CGC_DATA_READ
);
1732 cgc
.cmd
[0] = GPCMD_READ_DISC_INFO
;
1733 cgc
.cmd
[8] = cgc
.buflen
= 2;
1736 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1739 /* not all drives have the same disc_info length, so requeue
1740 * packet with the length the drive tells us it can supply
1742 cgc
.buflen
= be16_to_cpu(di
->disc_information_length
) +
1743 sizeof(di
->disc_information_length
);
1745 if (cgc
.buflen
> sizeof(disc_information
))
1746 cgc
.buflen
= sizeof(disc_information
);
1748 cgc
.cmd
[8] = cgc
.buflen
;
1749 return pkt_generic_packet(pd
, &cgc
);
1752 static int pkt_get_track_info(struct pktcdvd_device
*pd
, __u16 track
, __u8 type
, track_information
*ti
)
1754 struct packet_command cgc
;
1757 init_cdrom_command(&cgc
, ti
, 8, CGC_DATA_READ
);
1758 cgc
.cmd
[0] = GPCMD_READ_TRACK_RZONE_INFO
;
1759 cgc
.cmd
[1] = type
& 3;
1760 cgc
.cmd
[4] = (track
& 0xff00) >> 8;
1761 cgc
.cmd
[5] = track
& 0xff;
1765 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1768 cgc
.buflen
= be16_to_cpu(ti
->track_information_length
) +
1769 sizeof(ti
->track_information_length
);
1771 if (cgc
.buflen
> sizeof(track_information
))
1772 cgc
.buflen
= sizeof(track_information
);
1774 cgc
.cmd
[8] = cgc
.buflen
;
1775 return pkt_generic_packet(pd
, &cgc
);
1778 static int pkt_get_last_written(struct pktcdvd_device
*pd
, long *last_written
)
1780 disc_information di
;
1781 track_information ti
;
1785 if ((ret
= pkt_get_disc_info(pd
, &di
)))
1788 last_track
= (di
.last_track_msb
<< 8) | di
.last_track_lsb
;
1789 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1792 /* if this track is blank, try the previous. */
1795 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1799 /* if last recorded field is valid, return it. */
1801 *last_written
= be32_to_cpu(ti
.last_rec_address
);
1803 /* make it up instead */
1804 *last_written
= be32_to_cpu(ti
.track_start
) +
1805 be32_to_cpu(ti
.track_size
);
1807 *last_written
-= (be32_to_cpu(ti
.free_blocks
) + 7);
1813 * write mode select package based on pd->settings
1815 static int pkt_set_write_settings(struct pktcdvd_device
*pd
)
1817 struct packet_command cgc
;
1818 struct request_sense sense
;
1819 write_param_page
*wp
;
1823 /* doesn't apply to DVD+RW or DVD-RAM */
1824 if ((pd
->mmc3_profile
== 0x1a) || (pd
->mmc3_profile
== 0x12))
1827 memset(buffer
, 0, sizeof(buffer
));
1828 init_cdrom_command(&cgc
, buffer
, sizeof(*wp
), CGC_DATA_READ
);
1830 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1831 pkt_dump_sense(&cgc
);
1835 size
= 2 + ((buffer
[0] << 8) | (buffer
[1] & 0xff));
1836 pd
->mode_offset
= (buffer
[6] << 8) | (buffer
[7] & 0xff);
1837 if (size
> sizeof(buffer
))
1838 size
= sizeof(buffer
);
1843 init_cdrom_command(&cgc
, buffer
, size
, CGC_DATA_READ
);
1845 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1846 pkt_dump_sense(&cgc
);
1851 * write page is offset header + block descriptor length
1853 wp
= (write_param_page
*) &buffer
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
1855 wp
->fp
= pd
->settings
.fp
;
1856 wp
->track_mode
= pd
->settings
.track_mode
;
1857 wp
->write_type
= pd
->settings
.write_type
;
1858 wp
->data_block_type
= pd
->settings
.block_mode
;
1860 wp
->multi_session
= 0;
1862 #ifdef PACKET_USE_LS
1867 if (wp
->data_block_type
== PACKET_BLOCK_MODE1
) {
1868 wp
->session_format
= 0;
1870 } else if (wp
->data_block_type
== PACKET_BLOCK_MODE2
) {
1871 wp
->session_format
= 0x20;
1875 memcpy(&wp
->mcn
[1], PACKET_MCN
, sizeof(wp
->mcn
) - 1);
1881 printk(DRIVER_NAME
": write mode wrong %d\n", wp
->data_block_type
);
1884 wp
->packet_size
= cpu_to_be32(pd
->settings
.size
>> 2);
1886 cgc
.buflen
= cgc
.cmd
[8] = size
;
1887 if ((ret
= pkt_mode_select(pd
, &cgc
))) {
1888 pkt_dump_sense(&cgc
);
1892 pkt_print_settings(pd
);
1897 * 1 -- we can write to this track, 0 -- we can't
1899 static int pkt_writable_track(struct pktcdvd_device
*pd
, track_information
*ti
)
1901 switch (pd
->mmc3_profile
) {
1902 case 0x1a: /* DVD+RW */
1903 case 0x12: /* DVD-RAM */
1904 /* The track is always writable on DVD+RW/DVD-RAM */
1910 if (!ti
->packet
|| !ti
->fp
)
1914 * "good" settings as per Mt Fuji.
1916 if (ti
->rt
== 0 && ti
->blank
== 0)
1919 if (ti
->rt
== 0 && ti
->blank
== 1)
1922 if (ti
->rt
== 1 && ti
->blank
== 0)
1925 printk(DRIVER_NAME
": bad state %d-%d-%d\n", ti
->rt
, ti
->blank
, ti
->packet
);
1930 * 1 -- we can write to this disc, 0 -- we can't
1932 static int pkt_writable_disc(struct pktcdvd_device
*pd
, disc_information
*di
)
1934 switch (pd
->mmc3_profile
) {
1935 case 0x0a: /* CD-RW */
1936 case 0xffff: /* MMC3 not supported */
1938 case 0x1a: /* DVD+RW */
1939 case 0x13: /* DVD-RW */
1940 case 0x12: /* DVD-RAM */
1943 VPRINTK(DRIVER_NAME
": Wrong disc profile (%x)\n", pd
->mmc3_profile
);
1948 * for disc type 0xff we should probably reserve a new track.
1949 * but i'm not sure, should we leave this to user apps? probably.
1951 if (di
->disc_type
== 0xff) {
1952 printk(DRIVER_NAME
": Unknown disc. No track?\n");
1956 if (di
->disc_type
!= 0x20 && di
->disc_type
!= 0) {
1957 printk(DRIVER_NAME
": Wrong disc type (%x)\n", di
->disc_type
);
1961 if (di
->erasable
== 0) {
1962 printk(DRIVER_NAME
": Disc not erasable\n");
1966 if (di
->border_status
== PACKET_SESSION_RESERVED
) {
1967 printk(DRIVER_NAME
": Can't write to last track (reserved)\n");
1974 static int pkt_probe_settings(struct pktcdvd_device
*pd
)
1976 struct packet_command cgc
;
1977 unsigned char buf
[12];
1978 disc_information di
;
1979 track_information ti
;
1982 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1983 cgc
.cmd
[0] = GPCMD_GET_CONFIGURATION
;
1985 ret
= pkt_generic_packet(pd
, &cgc
);
1986 pd
->mmc3_profile
= ret
? 0xffff : buf
[6] << 8 | buf
[7];
1988 memset(&di
, 0, sizeof(disc_information
));
1989 memset(&ti
, 0, sizeof(track_information
));
1991 if ((ret
= pkt_get_disc_info(pd
, &di
))) {
1992 printk("failed get_disc\n");
1996 if (!pkt_writable_disc(pd
, &di
))
1999 pd
->type
= di
.erasable
? PACKET_CDRW
: PACKET_CDR
;
2001 track
= 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
2002 if ((ret
= pkt_get_track_info(pd
, track
, 1, &ti
))) {
2003 printk(DRIVER_NAME
": failed get_track\n");
2007 if (!pkt_writable_track(pd
, &ti
)) {
2008 printk(DRIVER_NAME
": can't write to this track\n");
2013 * we keep packet size in 512 byte units, makes it easier to
2014 * deal with request calculations.
2016 pd
->settings
.size
= be32_to_cpu(ti
.fixed_packet_size
) << 2;
2017 if (pd
->settings
.size
== 0) {
2018 printk(DRIVER_NAME
": detected zero packet size!\n");
2021 if (pd
->settings
.size
> PACKET_MAX_SECTORS
) {
2022 printk(DRIVER_NAME
": packet size is too big\n");
2025 pd
->settings
.fp
= ti
.fp
;
2026 pd
->offset
= (be32_to_cpu(ti
.track_start
) << 2) & (pd
->settings
.size
- 1);
2029 pd
->nwa
= be32_to_cpu(ti
.next_writable
);
2030 set_bit(PACKET_NWA_VALID
, &pd
->flags
);
2034 * in theory we could use lra on -RW media as well and just zero
2035 * blocks that haven't been written yet, but in practice that
2036 * is just a no-go. we'll use that for -R, naturally.
2039 pd
->lra
= be32_to_cpu(ti
.last_rec_address
);
2040 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
2042 pd
->lra
= 0xffffffff;
2043 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
2049 pd
->settings
.link_loss
= 7;
2050 pd
->settings
.write_type
= 0; /* packet */
2051 pd
->settings
.track_mode
= ti
.track_mode
;
2054 * mode1 or mode2 disc
2056 switch (ti
.data_mode
) {
2058 pd
->settings
.block_mode
= PACKET_BLOCK_MODE1
;
2061 pd
->settings
.block_mode
= PACKET_BLOCK_MODE2
;
2064 printk(DRIVER_NAME
": unknown data mode\n");
2071 * enable/disable write caching on drive
2073 static int pkt_write_caching(struct pktcdvd_device
*pd
, int set
)
2075 struct packet_command cgc
;
2076 struct request_sense sense
;
2077 unsigned char buf
[64];
2080 memset(buf
, 0, sizeof(buf
));
2081 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
2083 cgc
.buflen
= pd
->mode_offset
+ 12;
2086 * caching mode page might not be there, so quiet this command
2090 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WCACHING_PAGE
, 0)))
2093 buf
[pd
->mode_offset
+ 10] |= (!!set
<< 2);
2095 cgc
.buflen
= cgc
.cmd
[8] = 2 + ((buf
[0] << 8) | (buf
[1] & 0xff));
2096 ret
= pkt_mode_select(pd
, &cgc
);
2098 printk(DRIVER_NAME
": write caching control failed\n");
2099 pkt_dump_sense(&cgc
);
2100 } else if (!ret
&& set
)
2101 printk(DRIVER_NAME
": enabled write caching on %s\n", pd
->name
);
2105 static int pkt_lock_door(struct pktcdvd_device
*pd
, int lockflag
)
2107 struct packet_command cgc
;
2109 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2110 cgc
.cmd
[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL
;
2111 cgc
.cmd
[4] = lockflag
? 1 : 0;
2112 return pkt_generic_packet(pd
, &cgc
);
2116 * Returns drive maximum write speed
2118 static int pkt_get_max_speed(struct pktcdvd_device
*pd
, unsigned *write_speed
)
2120 struct packet_command cgc
;
2121 struct request_sense sense
;
2122 unsigned char buf
[256+18];
2123 unsigned char *cap_buf
;
2126 memset(buf
, 0, sizeof(buf
));
2127 cap_buf
= &buf
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
2128 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_UNKNOWN
);
2131 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2133 cgc
.buflen
= pd
->mode_offset
+ cap_buf
[1] + 2 +
2134 sizeof(struct mode_page_header
);
2135 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2137 pkt_dump_sense(&cgc
);
2142 offset
= 20; /* Obsoleted field, used by older drives */
2143 if (cap_buf
[1] >= 28)
2144 offset
= 28; /* Current write speed selected */
2145 if (cap_buf
[1] >= 30) {
2146 /* If the drive reports at least one "Logical Unit Write
2147 * Speed Performance Descriptor Block", use the information
2148 * in the first block. (contains the highest speed)
2150 int num_spdb
= (cap_buf
[30] << 8) + cap_buf
[31];
2155 *write_speed
= (cap_buf
[offset
] << 8) | cap_buf
[offset
+ 1];
2159 /* These tables from cdrecord - I don't have orange book */
2160 /* standard speed CD-RW (1-4x) */
2161 static char clv_to_speed
[16] = {
2162 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2163 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2165 /* high speed CD-RW (-10x) */
2166 static char hs_clv_to_speed
[16] = {
2167 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2168 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2170 /* ultra high speed CD-RW */
2171 static char us_clv_to_speed
[16] = {
2172 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2173 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2177 * reads the maximum media speed from ATIP
2179 static int pkt_media_speed(struct pktcdvd_device
*pd
, unsigned *speed
)
2181 struct packet_command cgc
;
2182 struct request_sense sense
;
2183 unsigned char buf
[64];
2184 unsigned int size
, st
, sp
;
2187 init_cdrom_command(&cgc
, buf
, 2, CGC_DATA_READ
);
2189 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2191 cgc
.cmd
[2] = 4; /* READ ATIP */
2193 ret
= pkt_generic_packet(pd
, &cgc
);
2195 pkt_dump_sense(&cgc
);
2198 size
= ((unsigned int) buf
[0]<<8) + buf
[1] + 2;
2199 if (size
> sizeof(buf
))
2202 init_cdrom_command(&cgc
, buf
, size
, CGC_DATA_READ
);
2204 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2208 ret
= pkt_generic_packet(pd
, &cgc
);
2210 pkt_dump_sense(&cgc
);
2214 if (!buf
[6] & 0x40) {
2215 printk(DRIVER_NAME
": Disc type is not CD-RW\n");
2218 if (!buf
[6] & 0x4) {
2219 printk(DRIVER_NAME
": A1 values on media are not valid, maybe not CDRW?\n");
2223 st
= (buf
[6] >> 3) & 0x7; /* disc sub-type */
2225 sp
= buf
[16] & 0xf; /* max speed from ATIP A1 field */
2227 /* Info from cdrecord */
2229 case 0: /* standard speed */
2230 *speed
= clv_to_speed
[sp
];
2232 case 1: /* high speed */
2233 *speed
= hs_clv_to_speed
[sp
];
2235 case 2: /* ultra high speed */
2236 *speed
= us_clv_to_speed
[sp
];
2239 printk(DRIVER_NAME
": Unknown disc sub-type %d\n",st
);
2243 printk(DRIVER_NAME
": Max. media speed: %d\n",*speed
);
2246 printk(DRIVER_NAME
": Unknown speed %d for sub-type %d\n",sp
,st
);
2251 static int pkt_perform_opc(struct pktcdvd_device
*pd
)
2253 struct packet_command cgc
;
2254 struct request_sense sense
;
2257 VPRINTK(DRIVER_NAME
": Performing OPC\n");
2259 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2261 cgc
.timeout
= 60*HZ
;
2262 cgc
.cmd
[0] = GPCMD_SEND_OPC
;
2264 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
2265 pkt_dump_sense(&cgc
);
2269 static int pkt_open_write(struct pktcdvd_device
*pd
)
2272 unsigned int write_speed
, media_write_speed
, read_speed
;
2274 if ((ret
= pkt_probe_settings(pd
))) {
2275 VPRINTK(DRIVER_NAME
": %s failed probe\n", pd
->name
);
2279 if ((ret
= pkt_set_write_settings(pd
))) {
2280 DPRINTK(DRIVER_NAME
": %s failed saving write settings\n", pd
->name
);
2284 pkt_write_caching(pd
, USE_WCACHING
);
2286 if ((ret
= pkt_get_max_speed(pd
, &write_speed
)))
2287 write_speed
= 16 * 177;
2288 switch (pd
->mmc3_profile
) {
2289 case 0x13: /* DVD-RW */
2290 case 0x1a: /* DVD+RW */
2291 case 0x12: /* DVD-RAM */
2292 DPRINTK(DRIVER_NAME
": write speed %ukB/s\n", write_speed
);
2295 if ((ret
= pkt_media_speed(pd
, &media_write_speed
)))
2296 media_write_speed
= 16;
2297 write_speed
= min(write_speed
, media_write_speed
* 177);
2298 DPRINTK(DRIVER_NAME
": write speed %ux\n", write_speed
/ 176);
2301 read_speed
= write_speed
;
2303 if ((ret
= pkt_set_speed(pd
, write_speed
, read_speed
))) {
2304 DPRINTK(DRIVER_NAME
": %s couldn't set write speed\n", pd
->name
);
2307 pd
->write_speed
= write_speed
;
2308 pd
->read_speed
= read_speed
;
2310 if ((ret
= pkt_perform_opc(pd
))) {
2311 DPRINTK(DRIVER_NAME
": %s Optimum Power Calibration failed\n", pd
->name
);
2318 * called at open time.
2320 static int pkt_open_dev(struct pktcdvd_device
*pd
, int write
)
2324 struct request_queue
*q
;
2327 * We need to re-open the cdrom device without O_NONBLOCK to be able
2328 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2329 * so bdget() can't fail.
2331 bdget(pd
->bdev
->bd_dev
);
2332 if ((ret
= blkdev_get(pd
->bdev
, FMODE_READ
, O_RDONLY
)))
2335 if ((ret
= bd_claim(pd
->bdev
, pd
)))
2338 if ((ret
= pkt_get_last_written(pd
, &lba
))) {
2339 printk(DRIVER_NAME
": pkt_get_last_written failed\n");
2343 set_capacity(pd
->disk
, lba
<< 2);
2344 set_capacity(pd
->bdev
->bd_disk
, lba
<< 2);
2345 bd_set_size(pd
->bdev
, (loff_t
)lba
<< 11);
2347 q
= bdev_get_queue(pd
->bdev
);
2349 if ((ret
= pkt_open_write(pd
)))
2352 * Some CDRW drives can not handle writes larger than one packet,
2353 * even if the size is a multiple of the packet size.
2355 spin_lock_irq(q
->queue_lock
);
2356 blk_queue_max_sectors(q
, pd
->settings
.size
);
2357 spin_unlock_irq(q
->queue_lock
);
2358 set_bit(PACKET_WRITABLE
, &pd
->flags
);
2360 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2361 clear_bit(PACKET_WRITABLE
, &pd
->flags
);
2364 if ((ret
= pkt_set_segment_merging(pd
, q
)))
2368 if (!pkt_grow_pktlist(pd
, CONFIG_CDROM_PKTCDVD_BUFFERS
)) {
2369 printk(DRIVER_NAME
": not enough memory for buffers\n");
2373 printk(DRIVER_NAME
": %lukB available on disc\n", lba
<< 1);
2379 bd_release(pd
->bdev
);
2381 blkdev_put(pd
->bdev
);
2387 * called when the device is closed. makes sure that the device flushes
2388 * the internal cache before we close.
2390 static void pkt_release_dev(struct pktcdvd_device
*pd
, int flush
)
2392 if (flush
&& pkt_flush_cache(pd
))
2393 DPRINTK(DRIVER_NAME
": %s not flushing cache\n", pd
->name
);
2395 pkt_lock_door(pd
, 0);
2397 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2398 bd_release(pd
->bdev
);
2399 blkdev_put(pd
->bdev
);
2401 pkt_shrink_pktlist(pd
);
2404 static struct pktcdvd_device
*pkt_find_dev_from_minor(int dev_minor
)
2406 if (dev_minor
>= MAX_WRITERS
)
2408 return pkt_devs
[dev_minor
];
2411 static int pkt_open(struct inode
*inode
, struct file
*file
)
2413 struct pktcdvd_device
*pd
= NULL
;
2416 VPRINTK(DRIVER_NAME
": entering open\n");
2418 mutex_lock(&ctl_mutex
);
2419 pd
= pkt_find_dev_from_minor(iminor(inode
));
2424 BUG_ON(pd
->refcnt
< 0);
2427 if (pd
->refcnt
> 1) {
2428 if ((file
->f_mode
& FMODE_WRITE
) &&
2429 !test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2434 ret
= pkt_open_dev(pd
, file
->f_mode
& FMODE_WRITE
);
2438 * needed here as well, since ext2 (among others) may change
2439 * the blocksize at mount time
2441 set_blocksize(inode
->i_bdev
, CD_FRAMESIZE
);
2444 mutex_unlock(&ctl_mutex
);
2450 VPRINTK(DRIVER_NAME
": failed open (%d)\n", ret
);
2451 mutex_unlock(&ctl_mutex
);
2455 static int pkt_close(struct inode
*inode
, struct file
*file
)
2457 struct pktcdvd_device
*pd
= inode
->i_bdev
->bd_disk
->private_data
;
2460 mutex_lock(&ctl_mutex
);
2462 BUG_ON(pd
->refcnt
< 0);
2463 if (pd
->refcnt
== 0) {
2464 int flush
= test_bit(PACKET_WRITABLE
, &pd
->flags
);
2465 pkt_release_dev(pd
, flush
);
2467 mutex_unlock(&ctl_mutex
);
2472 static void pkt_end_io_read_cloned(struct bio
*bio
, int err
)
2474 struct packet_stacked_data
*psd
= bio
->bi_private
;
2475 struct pktcdvd_device
*pd
= psd
->pd
;
2478 bio_endio(psd
->bio
, err
);
2479 mempool_free(psd
, psd_pool
);
2480 pkt_bio_finished(pd
);
2483 static int pkt_make_request(struct request_queue
*q
, struct bio
*bio
)
2485 struct pktcdvd_device
*pd
;
2486 char b
[BDEVNAME_SIZE
];
2488 struct packet_data
*pkt
;
2489 int was_empty
, blocked_bio
;
2490 struct pkt_rb_node
*node
;
2494 printk(DRIVER_NAME
": %s incorrect request queue\n", bdevname(bio
->bi_bdev
, b
));
2499 * Clone READ bios so we can have our own bi_end_io callback.
2501 if (bio_data_dir(bio
) == READ
) {
2502 struct bio
*cloned_bio
= bio_clone(bio
, GFP_NOIO
);
2503 struct packet_stacked_data
*psd
= mempool_alloc(psd_pool
, GFP_NOIO
);
2507 cloned_bio
->bi_bdev
= pd
->bdev
;
2508 cloned_bio
->bi_private
= psd
;
2509 cloned_bio
->bi_end_io
= pkt_end_io_read_cloned
;
2510 pd
->stats
.secs_r
+= bio
->bi_size
>> 9;
2511 pkt_queue_bio(pd
, cloned_bio
);
2515 if (!test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2516 printk(DRIVER_NAME
": WRITE for ro device %s (%llu)\n",
2517 pd
->name
, (unsigned long long)bio
->bi_sector
);
2521 if (!bio
->bi_size
|| (bio
->bi_size
% CD_FRAMESIZE
)) {
2522 printk(DRIVER_NAME
": wrong bio size\n");
2526 blk_queue_bounce(q
, &bio
);
2528 zone
= ZONE(bio
->bi_sector
, pd
);
2529 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2530 (unsigned long long)bio
->bi_sector
,
2531 (unsigned long long)(bio
->bi_sector
+ bio_sectors(bio
)));
2533 /* Check if we have to split the bio */
2535 struct bio_pair
*bp
;
2539 last_zone
= ZONE(bio
->bi_sector
+ bio_sectors(bio
) - 1, pd
);
2540 if (last_zone
!= zone
) {
2541 BUG_ON(last_zone
!= zone
+ pd
->settings
.size
);
2542 first_sectors
= last_zone
- bio
->bi_sector
;
2543 bp
= bio_split(bio
, bio_split_pool
, first_sectors
);
2545 pkt_make_request(q
, &bp
->bio1
);
2546 pkt_make_request(q
, &bp
->bio2
);
2547 bio_pair_release(bp
);
2553 * If we find a matching packet in state WAITING or READ_WAIT, we can
2554 * just append this bio to that packet.
2556 spin_lock(&pd
->cdrw
.active_list_lock
);
2558 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
2559 if (pkt
->sector
== zone
) {
2560 spin_lock(&pkt
->lock
);
2561 if ((pkt
->state
== PACKET_WAITING_STATE
) ||
2562 (pkt
->state
== PACKET_READ_WAIT_STATE
)) {
2563 pkt_add_list_last(bio
, &pkt
->orig_bios
,
2564 &pkt
->orig_bios_tail
);
2565 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
2566 if ((pkt
->write_size
>= pkt
->frames
) &&
2567 (pkt
->state
== PACKET_WAITING_STATE
)) {
2568 atomic_inc(&pkt
->run_sm
);
2569 wake_up(&pd
->wqueue
);
2571 spin_unlock(&pkt
->lock
);
2572 spin_unlock(&pd
->cdrw
.active_list_lock
);
2577 spin_unlock(&pkt
->lock
);
2580 spin_unlock(&pd
->cdrw
.active_list_lock
);
2583 * Test if there is enough room left in the bio work queue
2584 * (queue size >= congestion on mark).
2585 * If not, wait till the work queue size is below the congestion off mark.
2587 spin_lock(&pd
->lock
);
2588 if (pd
->write_congestion_on
> 0
2589 && pd
->bio_queue_size
>= pd
->write_congestion_on
) {
2590 set_bdi_congested(&q
->backing_dev_info
, WRITE
);
2592 spin_unlock(&pd
->lock
);
2593 congestion_wait(WRITE
, HZ
);
2594 spin_lock(&pd
->lock
);
2595 } while(pd
->bio_queue_size
> pd
->write_congestion_off
);
2597 spin_unlock(&pd
->lock
);
2600 * No matching packet found. Store the bio in the work queue.
2602 node
= mempool_alloc(pd
->rb_pool
, GFP_NOIO
);
2604 spin_lock(&pd
->lock
);
2605 BUG_ON(pd
->bio_queue_size
< 0);
2606 was_empty
= (pd
->bio_queue_size
== 0);
2607 pkt_rbtree_insert(pd
, node
);
2608 spin_unlock(&pd
->lock
);
2611 * Wake up the worker thread.
2613 atomic_set(&pd
->scan_queue
, 1);
2615 /* This wake_up is required for correct operation */
2616 wake_up(&pd
->wqueue
);
2617 } else if (!list_empty(&pd
->cdrw
.pkt_free_list
) && !blocked_bio
) {
2619 * This wake up is not required for correct operation,
2620 * but improves performance in some cases.
2622 wake_up(&pd
->wqueue
);
2632 static int pkt_merge_bvec(struct request_queue
*q
, struct bio
*bio
, struct bio_vec
*bvec
)
2634 struct pktcdvd_device
*pd
= q
->queuedata
;
2635 sector_t zone
= ZONE(bio
->bi_sector
, pd
);
2636 int used
= ((bio
->bi_sector
- zone
) << 9) + bio
->bi_size
;
2637 int remaining
= (pd
->settings
.size
<< 9) - used
;
2641 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2642 * boundary, pkt_make_request() will split the bio.
2644 remaining2
= PAGE_SIZE
- bio
->bi_size
;
2645 remaining
= max(remaining
, remaining2
);
2647 BUG_ON(remaining
< 0);
2651 static void pkt_init_queue(struct pktcdvd_device
*pd
)
2653 struct request_queue
*q
= pd
->disk
->queue
;
2655 blk_queue_make_request(q
, pkt_make_request
);
2656 blk_queue_hardsect_size(q
, CD_FRAMESIZE
);
2657 blk_queue_max_sectors(q
, PACKET_MAX_SECTORS
);
2658 blk_queue_merge_bvec(q
, pkt_merge_bvec
);
2662 static int pkt_seq_show(struct seq_file
*m
, void *p
)
2664 struct pktcdvd_device
*pd
= m
->private;
2666 char bdev_buf
[BDEVNAME_SIZE
];
2667 int states
[PACKET_NUM_STATES
];
2669 seq_printf(m
, "Writer %s mapped to %s:\n", pd
->name
,
2670 bdevname(pd
->bdev
, bdev_buf
));
2672 seq_printf(m
, "\nSettings:\n");
2673 seq_printf(m
, "\tpacket size:\t\t%dkB\n", pd
->settings
.size
/ 2);
2675 if (pd
->settings
.write_type
== 0)
2679 seq_printf(m
, "\twrite type:\t\t%s\n", msg
);
2681 seq_printf(m
, "\tpacket type:\t\t%s\n", pd
->settings
.fp
? "Fixed" : "Variable");
2682 seq_printf(m
, "\tlink loss:\t\t%d\n", pd
->settings
.link_loss
);
2684 seq_printf(m
, "\ttrack mode:\t\t%d\n", pd
->settings
.track_mode
);
2686 if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE1
)
2688 else if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE2
)
2692 seq_printf(m
, "\tblock mode:\t\t%s\n", msg
);
2694 seq_printf(m
, "\nStatistics:\n");
2695 seq_printf(m
, "\tpackets started:\t%lu\n", pd
->stats
.pkt_started
);
2696 seq_printf(m
, "\tpackets ended:\t\t%lu\n", pd
->stats
.pkt_ended
);
2697 seq_printf(m
, "\twritten:\t\t%lukB\n", pd
->stats
.secs_w
>> 1);
2698 seq_printf(m
, "\tread gather:\t\t%lukB\n", pd
->stats
.secs_rg
>> 1);
2699 seq_printf(m
, "\tread:\t\t\t%lukB\n", pd
->stats
.secs_r
>> 1);
2701 seq_printf(m
, "\nMisc:\n");
2702 seq_printf(m
, "\treference count:\t%d\n", pd
->refcnt
);
2703 seq_printf(m
, "\tflags:\t\t\t0x%lx\n", pd
->flags
);
2704 seq_printf(m
, "\tread speed:\t\t%ukB/s\n", pd
->read_speed
);
2705 seq_printf(m
, "\twrite speed:\t\t%ukB/s\n", pd
->write_speed
);
2706 seq_printf(m
, "\tstart offset:\t\t%lu\n", pd
->offset
);
2707 seq_printf(m
, "\tmode page offset:\t%u\n", pd
->mode_offset
);
2709 seq_printf(m
, "\nQueue state:\n");
2710 seq_printf(m
, "\tbios queued:\t\t%d\n", pd
->bio_queue_size
);
2711 seq_printf(m
, "\tbios pending:\t\t%d\n", atomic_read(&pd
->cdrw
.pending_bios
));
2712 seq_printf(m
, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd
->current_sector
);
2714 pkt_count_states(pd
, states
);
2715 seq_printf(m
, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2716 states
[0], states
[1], states
[2], states
[3], states
[4], states
[5]);
2718 seq_printf(m
, "\twrite congestion marks:\toff=%d on=%d\n",
2719 pd
->write_congestion_off
,
2720 pd
->write_congestion_on
);
2724 static int pkt_seq_open(struct inode
*inode
, struct file
*file
)
2726 return single_open(file
, pkt_seq_show
, PDE(inode
)->data
);
2729 static const struct file_operations pkt_proc_fops
= {
2730 .open
= pkt_seq_open
,
2732 .llseek
= seq_lseek
,
2733 .release
= single_release
2736 static int pkt_new_dev(struct pktcdvd_device
*pd
, dev_t dev
)
2740 char b
[BDEVNAME_SIZE
];
2741 struct proc_dir_entry
*proc
;
2742 struct block_device
*bdev
;
2744 if (pd
->pkt_dev
== dev
) {
2745 printk(DRIVER_NAME
": Recursive setup not allowed\n");
2748 for (i
= 0; i
< MAX_WRITERS
; i
++) {
2749 struct pktcdvd_device
*pd2
= pkt_devs
[i
];
2752 if (pd2
->bdev
->bd_dev
== dev
) {
2753 printk(DRIVER_NAME
": %s already setup\n", bdevname(pd2
->bdev
, b
));
2756 if (pd2
->pkt_dev
== dev
) {
2757 printk(DRIVER_NAME
": Can't chain pktcdvd devices\n");
2765 ret
= blkdev_get(bdev
, FMODE_READ
, O_RDONLY
| O_NONBLOCK
);
2769 /* This is safe, since we have a reference from open(). */
2770 __module_get(THIS_MODULE
);
2773 set_blocksize(bdev
, CD_FRAMESIZE
);
2777 atomic_set(&pd
->cdrw
.pending_bios
, 0);
2778 pd
->cdrw
.thread
= kthread_run(kcdrwd
, pd
, "%s", pd
->name
);
2779 if (IS_ERR(pd
->cdrw
.thread
)) {
2780 printk(DRIVER_NAME
": can't start kernel thread\n");
2785 proc
= create_proc_entry(pd
->name
, 0, pkt_proc
);
2788 proc
->proc_fops
= &pkt_proc_fops
;
2790 DPRINTK(DRIVER_NAME
": writer %s mapped to %s\n", pd
->name
, bdevname(bdev
, b
));
2795 /* This is safe: open() is still holding a reference. */
2796 module_put(THIS_MODULE
);
2800 static int pkt_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
2802 struct pktcdvd_device
*pd
= inode
->i_bdev
->bd_disk
->private_data
;
2804 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd
, imajor(inode
), iminor(inode
));
2808 * forward selected CDROM ioctls to CD-ROM, for UDF
2810 case CDROMMULTISESSION
:
2811 case CDROMREADTOCENTRY
:
2812 case CDROM_LAST_WRITTEN
:
2813 case CDROM_SEND_PACKET
:
2814 case SCSI_IOCTL_SEND_COMMAND
:
2815 return blkdev_ioctl(pd
->bdev
->bd_inode
, file
, cmd
, arg
);
2819 * The door gets locked when the device is opened, so we
2820 * have to unlock it or else the eject command fails.
2822 if (pd
->refcnt
== 1)
2823 pkt_lock_door(pd
, 0);
2824 return blkdev_ioctl(pd
->bdev
->bd_inode
, file
, cmd
, arg
);
2827 VPRINTK(DRIVER_NAME
": Unknown ioctl for %s (%x)\n", pd
->name
, cmd
);
2834 static int pkt_media_changed(struct gendisk
*disk
)
2836 struct pktcdvd_device
*pd
= disk
->private_data
;
2837 struct gendisk
*attached_disk
;
2843 attached_disk
= pd
->bdev
->bd_disk
;
2846 return attached_disk
->fops
->media_changed(attached_disk
);
2849 static struct block_device_operations pktcdvd_ops
= {
2850 .owner
= THIS_MODULE
,
2852 .release
= pkt_close
,
2854 .media_changed
= pkt_media_changed
,
2858 * Set up mapping from pktcdvd device to CD-ROM device.
2860 static int pkt_setup_dev(dev_t dev
, dev_t
* pkt_dev
)
2864 struct pktcdvd_device
*pd
;
2865 struct gendisk
*disk
;
2867 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2869 for (idx
= 0; idx
< MAX_WRITERS
; idx
++)
2872 if (idx
== MAX_WRITERS
) {
2873 printk(DRIVER_NAME
": max %d writers supported\n", MAX_WRITERS
);
2878 pd
= kzalloc(sizeof(struct pktcdvd_device
), GFP_KERNEL
);
2882 pd
->rb_pool
= mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE
,
2883 sizeof(struct pkt_rb_node
));
2887 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
2888 INIT_LIST_HEAD(&pd
->cdrw
.pkt_active_list
);
2889 spin_lock_init(&pd
->cdrw
.active_list_lock
);
2891 spin_lock_init(&pd
->lock
);
2892 spin_lock_init(&pd
->iosched
.lock
);
2893 sprintf(pd
->name
, DRIVER_NAME
"%d", idx
);
2894 init_waitqueue_head(&pd
->wqueue
);
2895 pd
->bio_queue
= RB_ROOT
;
2897 pd
->write_congestion_on
= write_congestion_on
;
2898 pd
->write_congestion_off
= write_congestion_off
;
2900 disk
= alloc_disk(1);
2904 disk
->major
= pktdev_major
;
2905 disk
->first_minor
= idx
;
2906 disk
->fops
= &pktcdvd_ops
;
2907 disk
->flags
= GENHD_FL_REMOVABLE
;
2908 strcpy(disk
->disk_name
, pd
->name
);
2909 disk
->private_data
= pd
;
2910 disk
->queue
= blk_alloc_queue(GFP_KERNEL
);
2914 pd
->pkt_dev
= MKDEV(disk
->major
, disk
->first_minor
);
2915 ret
= pkt_new_dev(pd
, dev
);
2921 pkt_sysfs_dev_new(pd
);
2922 pkt_debugfs_dev_new(pd
);
2926 *pkt_dev
= pd
->pkt_dev
;
2928 mutex_unlock(&ctl_mutex
);
2932 blk_cleanup_queue(disk
->queue
);
2937 mempool_destroy(pd
->rb_pool
);
2940 mutex_unlock(&ctl_mutex
);
2941 printk(DRIVER_NAME
": setup of pktcdvd device failed\n");
2946 * Tear down mapping from pktcdvd device to CD-ROM device.
2948 static int pkt_remove_dev(dev_t pkt_dev
)
2950 struct pktcdvd_device
*pd
;
2954 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2956 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
2958 if (pd
&& (pd
->pkt_dev
== pkt_dev
))
2961 if (idx
== MAX_WRITERS
) {
2962 DPRINTK(DRIVER_NAME
": dev not setup\n");
2967 if (pd
->refcnt
> 0) {
2971 if (!IS_ERR(pd
->cdrw
.thread
))
2972 kthread_stop(pd
->cdrw
.thread
);
2974 pkt_devs
[idx
] = NULL
;
2976 pkt_debugfs_dev_remove(pd
);
2977 pkt_sysfs_dev_remove(pd
);
2979 blkdev_put(pd
->bdev
);
2981 remove_proc_entry(pd
->name
, pkt_proc
);
2982 DPRINTK(DRIVER_NAME
": writer %s unmapped\n", pd
->name
);
2984 del_gendisk(pd
->disk
);
2985 blk_cleanup_queue(pd
->disk
->queue
);
2988 mempool_destroy(pd
->rb_pool
);
2991 /* This is safe: open() is still holding a reference. */
2992 module_put(THIS_MODULE
);
2995 mutex_unlock(&ctl_mutex
);
2999 static void pkt_get_status(struct pkt_ctrl_command
*ctrl_cmd
)
3001 struct pktcdvd_device
*pd
;
3003 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
3005 pd
= pkt_find_dev_from_minor(ctrl_cmd
->dev_index
);
3007 ctrl_cmd
->dev
= new_encode_dev(pd
->bdev
->bd_dev
);
3008 ctrl_cmd
->pkt_dev
= new_encode_dev(pd
->pkt_dev
);
3011 ctrl_cmd
->pkt_dev
= 0;
3013 ctrl_cmd
->num_devices
= MAX_WRITERS
;
3015 mutex_unlock(&ctl_mutex
);
3018 static int pkt_ctl_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
3020 void __user
*argp
= (void __user
*)arg
;
3021 struct pkt_ctrl_command ctrl_cmd
;
3025 if (cmd
!= PACKET_CTRL_CMD
)
3028 if (copy_from_user(&ctrl_cmd
, argp
, sizeof(struct pkt_ctrl_command
)))
3031 switch (ctrl_cmd
.command
) {
3032 case PKT_CTRL_CMD_SETUP
:
3033 if (!capable(CAP_SYS_ADMIN
))
3035 ret
= pkt_setup_dev(new_decode_dev(ctrl_cmd
.dev
), &pkt_dev
);
3036 ctrl_cmd
.pkt_dev
= new_encode_dev(pkt_dev
);
3038 case PKT_CTRL_CMD_TEARDOWN
:
3039 if (!capable(CAP_SYS_ADMIN
))
3041 ret
= pkt_remove_dev(new_decode_dev(ctrl_cmd
.pkt_dev
));
3043 case PKT_CTRL_CMD_STATUS
:
3044 pkt_get_status(&ctrl_cmd
);
3050 if (copy_to_user(argp
, &ctrl_cmd
, sizeof(struct pkt_ctrl_command
)))
3056 static const struct file_operations pkt_ctl_fops
= {
3057 .ioctl
= pkt_ctl_ioctl
,
3058 .owner
= THIS_MODULE
,
3061 static struct miscdevice pkt_misc
= {
3062 .minor
= MISC_DYNAMIC_MINOR
,
3063 .name
= DRIVER_NAME
,
3064 .fops
= &pkt_ctl_fops
3067 static int __init
pkt_init(void)
3071 mutex_init(&ctl_mutex
);
3073 psd_pool
= mempool_create_kmalloc_pool(PSD_POOL_SIZE
,
3074 sizeof(struct packet_stacked_data
));
3078 ret
= register_blkdev(pktdev_major
, DRIVER_NAME
);
3080 printk(DRIVER_NAME
": Unable to register block device\n");
3086 ret
= pkt_sysfs_init();
3092 ret
= misc_register(&pkt_misc
);
3094 printk(DRIVER_NAME
": Unable to register misc device\n");
3098 pkt_proc
= proc_mkdir(DRIVER_NAME
, proc_root_driver
);
3103 pkt_debugfs_cleanup();
3104 pkt_sysfs_cleanup();
3106 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3108 mempool_destroy(psd_pool
);
3112 static void __exit
pkt_exit(void)
3114 remove_proc_entry(DRIVER_NAME
, proc_root_driver
);
3115 misc_deregister(&pkt_misc
);
3117 pkt_debugfs_cleanup();
3118 pkt_sysfs_cleanup();
3120 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3121 mempool_destroy(psd_pool
);
3124 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3125 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3126 MODULE_LICENSE("GPL");
3128 module_init(pkt_init
);
3129 module_exit(pkt_exit
);