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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
49 #include <linux/pktcdvd.h>
50 #include <linux/module.h>
51 #include <linux/types.h>
52 #include <linux/kernel.h>
53 #include <linux/compat.h>
54 #include <linux/kthread.h>
55 #include <linux/errno.h>
56 #include <linux/spinlock.h>
57 #include <linux/file.h>
58 #include <linux/proc_fs.h>
59 #include <linux/seq_file.h>
60 #include <linux/miscdevice.h>
61 #include <linux/freezer.h>
62 #include <linux/mutex.h>
63 #include <linux/slab.h>
64 #include <scsi/scsi_cmnd.h>
65 #include <scsi/scsi_ioctl.h>
66 #include <scsi/scsi.h>
67 #include <linux/debugfs.h>
68 #include <linux/device.h>
70 #include <asm/uaccess.h>
72 #define DRIVER_NAME "pktcdvd"
74 #define pkt_err(pd, fmt, ...) \
75 pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
76 #define pkt_notice(pd, fmt, ...) \
77 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
78 #define pkt_info(pd, fmt, ...) \
79 pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
81 #define pkt_dbg(level, pd, fmt, ...) \
83 if (level == 2 && PACKET_DEBUG >= 2) \
84 pr_notice("%s: %s():" fmt, \
85 pd->name, __func__, ##__VA_ARGS__); \
86 else if (level == 1 && PACKET_DEBUG >= 1) \
87 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \
90 #define MAX_SPEED 0xffff
92 static DEFINE_MUTEX(pktcdvd_mutex
);
93 static struct pktcdvd_device
*pkt_devs
[MAX_WRITERS
];
94 static struct proc_dir_entry
*pkt_proc
;
95 static int pktdev_major
;
96 static int write_congestion_on
= PKT_WRITE_CONGESTION_ON
;
97 static int write_congestion_off
= PKT_WRITE_CONGESTION_OFF
;
98 static struct mutex ctl_mutex
; /* Serialize open/close/setup/teardown */
99 static mempool_t
*psd_pool
;
101 static struct class *class_pktcdvd
= NULL
; /* /sys/class/pktcdvd */
102 static struct dentry
*pkt_debugfs_root
= NULL
; /* /sys/kernel/debug/pktcdvd */
104 /* forward declaration */
105 static int pkt_setup_dev(dev_t dev
, dev_t
* pkt_dev
);
106 static int pkt_remove_dev(dev_t pkt_dev
);
107 static int pkt_seq_show(struct seq_file
*m
, void *p
);
109 static sector_t
get_zone(sector_t sector
, struct pktcdvd_device
*pd
)
111 return (sector
+ pd
->offset
) & ~(sector_t
)(pd
->settings
.size
- 1);
115 * create and register a pktcdvd kernel object.
117 static struct pktcdvd_kobj
* pkt_kobj_create(struct pktcdvd_device
*pd
,
119 struct kobject
* parent
,
120 struct kobj_type
* ktype
)
122 struct pktcdvd_kobj
*p
;
125 p
= kzalloc(sizeof(*p
), GFP_KERNEL
);
129 error
= kobject_init_and_add(&p
->kobj
, ktype
, parent
, "%s", name
);
131 kobject_put(&p
->kobj
);
134 kobject_uevent(&p
->kobj
, KOBJ_ADD
);
138 * remove a pktcdvd kernel object.
140 static void pkt_kobj_remove(struct pktcdvd_kobj
*p
)
143 kobject_put(&p
->kobj
);
146 * default release function for pktcdvd kernel objects.
148 static void pkt_kobj_release(struct kobject
*kobj
)
150 kfree(to_pktcdvdkobj(kobj
));
154 /**********************************************************
156 * sysfs interface for pktcdvd
157 * by (C) 2006 Thomas Maier <balagi@justmail.de>
159 **********************************************************/
161 #define DEF_ATTR(_obj,_name,_mode) \
162 static struct attribute _obj = { .name = _name, .mode = _mode }
164 /**********************************************************
165 /sys/class/pktcdvd/pktcdvd[0-7]/
168 stat/packets_finished
173 write_queue/congestion_off
174 write_queue/congestion_on
175 **********************************************************/
177 DEF_ATTR(kobj_pkt_attr_st1
, "reset", 0200);
178 DEF_ATTR(kobj_pkt_attr_st2
, "packets_started", 0444);
179 DEF_ATTR(kobj_pkt_attr_st3
, "packets_finished", 0444);
180 DEF_ATTR(kobj_pkt_attr_st4
, "kb_written", 0444);
181 DEF_ATTR(kobj_pkt_attr_st5
, "kb_read", 0444);
182 DEF_ATTR(kobj_pkt_attr_st6
, "kb_read_gather", 0444);
184 static struct attribute
*kobj_pkt_attrs_stat
[] = {
194 DEF_ATTR(kobj_pkt_attr_wq1
, "size", 0444);
195 DEF_ATTR(kobj_pkt_attr_wq2
, "congestion_off", 0644);
196 DEF_ATTR(kobj_pkt_attr_wq3
, "congestion_on", 0644);
198 static struct attribute
*kobj_pkt_attrs_wqueue
[] = {
205 static ssize_t
kobj_pkt_show(struct kobject
*kobj
,
206 struct attribute
*attr
, char *data
)
208 struct pktcdvd_device
*pd
= to_pktcdvdkobj(kobj
)->pd
;
211 if (strcmp(attr
->name
, "packets_started") == 0) {
212 n
= sprintf(data
, "%lu\n", pd
->stats
.pkt_started
);
214 } else if (strcmp(attr
->name
, "packets_finished") == 0) {
215 n
= sprintf(data
, "%lu\n", pd
->stats
.pkt_ended
);
217 } else if (strcmp(attr
->name
, "kb_written") == 0) {
218 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_w
>> 1);
220 } else if (strcmp(attr
->name
, "kb_read") == 0) {
221 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_r
>> 1);
223 } else if (strcmp(attr
->name
, "kb_read_gather") == 0) {
224 n
= sprintf(data
, "%lu\n", pd
->stats
.secs_rg
>> 1);
226 } else if (strcmp(attr
->name
, "size") == 0) {
227 spin_lock(&pd
->lock
);
228 v
= pd
->bio_queue_size
;
229 spin_unlock(&pd
->lock
);
230 n
= sprintf(data
, "%d\n", v
);
232 } else if (strcmp(attr
->name
, "congestion_off") == 0) {
233 spin_lock(&pd
->lock
);
234 v
= pd
->write_congestion_off
;
235 spin_unlock(&pd
->lock
);
236 n
= sprintf(data
, "%d\n", v
);
238 } else if (strcmp(attr
->name
, "congestion_on") == 0) {
239 spin_lock(&pd
->lock
);
240 v
= pd
->write_congestion_on
;
241 spin_unlock(&pd
->lock
);
242 n
= sprintf(data
, "%d\n", v
);
247 static void init_write_congestion_marks(int* lo
, int* hi
)
251 *hi
= min(*hi
, 1000000);
255 *lo
= min(*lo
, *hi
- 100);
264 static ssize_t
kobj_pkt_store(struct kobject
*kobj
,
265 struct attribute
*attr
,
266 const char *data
, size_t len
)
268 struct pktcdvd_device
*pd
= to_pktcdvdkobj(kobj
)->pd
;
271 if (strcmp(attr
->name
, "reset") == 0 && len
> 0) {
272 pd
->stats
.pkt_started
= 0;
273 pd
->stats
.pkt_ended
= 0;
274 pd
->stats
.secs_w
= 0;
275 pd
->stats
.secs_rg
= 0;
276 pd
->stats
.secs_r
= 0;
278 } else if (strcmp(attr
->name
, "congestion_off") == 0
279 && sscanf(data
, "%d", &val
) == 1) {
280 spin_lock(&pd
->lock
);
281 pd
->write_congestion_off
= val
;
282 init_write_congestion_marks(&pd
->write_congestion_off
,
283 &pd
->write_congestion_on
);
284 spin_unlock(&pd
->lock
);
286 } else if (strcmp(attr
->name
, "congestion_on") == 0
287 && sscanf(data
, "%d", &val
) == 1) {
288 spin_lock(&pd
->lock
);
289 pd
->write_congestion_on
= val
;
290 init_write_congestion_marks(&pd
->write_congestion_off
,
291 &pd
->write_congestion_on
);
292 spin_unlock(&pd
->lock
);
297 static const struct sysfs_ops kobj_pkt_ops
= {
298 .show
= kobj_pkt_show
,
299 .store
= kobj_pkt_store
301 static struct kobj_type kobj_pkt_type_stat
= {
302 .release
= pkt_kobj_release
,
303 .sysfs_ops
= &kobj_pkt_ops
,
304 .default_attrs
= kobj_pkt_attrs_stat
306 static struct kobj_type kobj_pkt_type_wqueue
= {
307 .release
= pkt_kobj_release
,
308 .sysfs_ops
= &kobj_pkt_ops
,
309 .default_attrs
= kobj_pkt_attrs_wqueue
312 static void pkt_sysfs_dev_new(struct pktcdvd_device
*pd
)
315 pd
->dev
= device_create(class_pktcdvd
, NULL
, MKDEV(0, 0), NULL
,
321 pd
->kobj_stat
= pkt_kobj_create(pd
, "stat",
323 &kobj_pkt_type_stat
);
324 pd
->kobj_wqueue
= pkt_kobj_create(pd
, "write_queue",
326 &kobj_pkt_type_wqueue
);
330 static void pkt_sysfs_dev_remove(struct pktcdvd_device
*pd
)
332 pkt_kobj_remove(pd
->kobj_stat
);
333 pkt_kobj_remove(pd
->kobj_wqueue
);
335 device_unregister(pd
->dev
);
339 /********************************************************************
342 remove unmap packet dev
343 device_map show mappings
344 *******************************************************************/
346 static void class_pktcdvd_release(struct class *cls
)
350 static ssize_t
class_pktcdvd_show_map(struct class *c
,
351 struct class_attribute
*attr
,
356 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
357 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
358 struct pktcdvd_device
*pd
= pkt_devs
[idx
];
361 n
+= sprintf(data
+n
, "%s %u:%u %u:%u\n",
363 MAJOR(pd
->pkt_dev
), MINOR(pd
->pkt_dev
),
364 MAJOR(pd
->bdev
->bd_dev
),
365 MINOR(pd
->bdev
->bd_dev
));
367 mutex_unlock(&ctl_mutex
);
371 static ssize_t
class_pktcdvd_store_add(struct class *c
,
372 struct class_attribute
*attr
,
376 unsigned int major
, minor
;
378 if (sscanf(buf
, "%u:%u", &major
, &minor
) == 2) {
379 /* pkt_setup_dev() expects caller to hold reference to self */
380 if (!try_module_get(THIS_MODULE
))
383 pkt_setup_dev(MKDEV(major
, minor
), NULL
);
385 module_put(THIS_MODULE
);
393 static ssize_t
class_pktcdvd_store_remove(struct class *c
,
394 struct class_attribute
*attr
,
398 unsigned int major
, minor
;
399 if (sscanf(buf
, "%u:%u", &major
, &minor
) == 2) {
400 pkt_remove_dev(MKDEV(major
, minor
));
406 static struct class_attribute class_pktcdvd_attrs
[] = {
407 __ATTR(add
, 0200, NULL
, class_pktcdvd_store_add
),
408 __ATTR(remove
, 0200, NULL
, class_pktcdvd_store_remove
),
409 __ATTR(device_map
, 0444, class_pktcdvd_show_map
, NULL
),
414 static int pkt_sysfs_init(void)
419 * create control files in sysfs
420 * /sys/class/pktcdvd/...
422 class_pktcdvd
= kzalloc(sizeof(*class_pktcdvd
), GFP_KERNEL
);
425 class_pktcdvd
->name
= DRIVER_NAME
;
426 class_pktcdvd
->owner
= THIS_MODULE
;
427 class_pktcdvd
->class_release
= class_pktcdvd_release
;
428 class_pktcdvd
->class_attrs
= class_pktcdvd_attrs
;
429 ret
= class_register(class_pktcdvd
);
431 kfree(class_pktcdvd
);
432 class_pktcdvd
= NULL
;
433 pr_err("failed to create class pktcdvd\n");
439 static void pkt_sysfs_cleanup(void)
442 class_destroy(class_pktcdvd
);
443 class_pktcdvd
= NULL
;
446 /********************************************************************
449 /sys/kernel/debug/pktcdvd[0-7]/
452 *******************************************************************/
454 static int pkt_debugfs_seq_show(struct seq_file
*m
, void *p
)
456 return pkt_seq_show(m
, p
);
459 static int pkt_debugfs_fops_open(struct inode
*inode
, struct file
*file
)
461 return single_open(file
, pkt_debugfs_seq_show
, inode
->i_private
);
464 static const struct file_operations debug_fops
= {
465 .open
= pkt_debugfs_fops_open
,
468 .release
= single_release
,
469 .owner
= THIS_MODULE
,
472 static void pkt_debugfs_dev_new(struct pktcdvd_device
*pd
)
474 if (!pkt_debugfs_root
)
476 pd
->dfs_f_info
= NULL
;
477 pd
->dfs_d_root
= debugfs_create_dir(pd
->name
, pkt_debugfs_root
);
478 if (IS_ERR(pd
->dfs_d_root
)) {
479 pd
->dfs_d_root
= NULL
;
482 pd
->dfs_f_info
= debugfs_create_file("info", S_IRUGO
,
483 pd
->dfs_d_root
, pd
, &debug_fops
);
484 if (IS_ERR(pd
->dfs_f_info
)) {
485 pd
->dfs_f_info
= NULL
;
490 static void pkt_debugfs_dev_remove(struct pktcdvd_device
*pd
)
492 if (!pkt_debugfs_root
)
495 debugfs_remove(pd
->dfs_f_info
);
496 pd
->dfs_f_info
= NULL
;
498 debugfs_remove(pd
->dfs_d_root
);
499 pd
->dfs_d_root
= NULL
;
502 static void pkt_debugfs_init(void)
504 pkt_debugfs_root
= debugfs_create_dir(DRIVER_NAME
, NULL
);
505 if (IS_ERR(pkt_debugfs_root
)) {
506 pkt_debugfs_root
= NULL
;
511 static void pkt_debugfs_cleanup(void)
513 if (!pkt_debugfs_root
)
515 debugfs_remove(pkt_debugfs_root
);
516 pkt_debugfs_root
= NULL
;
519 /* ----------------------------------------------------------*/
522 static void pkt_bio_finished(struct pktcdvd_device
*pd
)
524 BUG_ON(atomic_read(&pd
->cdrw
.pending_bios
) <= 0);
525 if (atomic_dec_and_test(&pd
->cdrw
.pending_bios
)) {
526 pkt_dbg(2, pd
, "queue empty\n");
527 atomic_set(&pd
->iosched
.attention
, 1);
528 wake_up(&pd
->wqueue
);
533 * Allocate a packet_data struct
535 static struct packet_data
*pkt_alloc_packet_data(int frames
)
538 struct packet_data
*pkt
;
540 pkt
= kzalloc(sizeof(struct packet_data
), GFP_KERNEL
);
544 pkt
->frames
= frames
;
545 pkt
->w_bio
= bio_kmalloc(GFP_KERNEL
, frames
);
549 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++) {
550 pkt
->pages
[i
] = alloc_page(GFP_KERNEL
|__GFP_ZERO
);
555 spin_lock_init(&pkt
->lock
);
556 bio_list_init(&pkt
->orig_bios
);
558 for (i
= 0; i
< frames
; i
++) {
559 struct bio
*bio
= bio_kmalloc(GFP_KERNEL
, 1);
563 pkt
->r_bios
[i
] = bio
;
569 for (i
= 0; i
< frames
; i
++) {
570 struct bio
*bio
= pkt
->r_bios
[i
];
576 for (i
= 0; i
< frames
/ FRAMES_PER_PAGE
; i
++)
578 __free_page(pkt
->pages
[i
]);
587 * Free a packet_data struct
589 static void pkt_free_packet_data(struct packet_data
*pkt
)
593 for (i
= 0; i
< pkt
->frames
; i
++) {
594 struct bio
*bio
= pkt
->r_bios
[i
];
598 for (i
= 0; i
< pkt
->frames
/ FRAMES_PER_PAGE
; i
++)
599 __free_page(pkt
->pages
[i
]);
604 static void pkt_shrink_pktlist(struct pktcdvd_device
*pd
)
606 struct packet_data
*pkt
, *next
;
608 BUG_ON(!list_empty(&pd
->cdrw
.pkt_active_list
));
610 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_free_list
, list
) {
611 pkt_free_packet_data(pkt
);
613 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
616 static int pkt_grow_pktlist(struct pktcdvd_device
*pd
, int nr_packets
)
618 struct packet_data
*pkt
;
620 BUG_ON(!list_empty(&pd
->cdrw
.pkt_free_list
));
622 while (nr_packets
> 0) {
623 pkt
= pkt_alloc_packet_data(pd
->settings
.size
>> 2);
625 pkt_shrink_pktlist(pd
);
628 pkt
->id
= nr_packets
;
630 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
636 static inline struct pkt_rb_node
*pkt_rbtree_next(struct pkt_rb_node
*node
)
638 struct rb_node
*n
= rb_next(&node
->rb_node
);
641 return rb_entry(n
, struct pkt_rb_node
, rb_node
);
644 static void pkt_rbtree_erase(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
646 rb_erase(&node
->rb_node
, &pd
->bio_queue
);
647 mempool_free(node
, pd
->rb_pool
);
648 pd
->bio_queue_size
--;
649 BUG_ON(pd
->bio_queue_size
< 0);
653 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
655 static struct pkt_rb_node
*pkt_rbtree_find(struct pktcdvd_device
*pd
, sector_t s
)
657 struct rb_node
*n
= pd
->bio_queue
.rb_node
;
658 struct rb_node
*next
;
659 struct pkt_rb_node
*tmp
;
662 BUG_ON(pd
->bio_queue_size
> 0);
667 tmp
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
668 if (s
<= tmp
->bio
->bi_sector
)
677 if (s
> tmp
->bio
->bi_sector
) {
678 tmp
= pkt_rbtree_next(tmp
);
682 BUG_ON(s
> tmp
->bio
->bi_sector
);
687 * Insert a node into the pd->bio_queue rb tree.
689 static void pkt_rbtree_insert(struct pktcdvd_device
*pd
, struct pkt_rb_node
*node
)
691 struct rb_node
**p
= &pd
->bio_queue
.rb_node
;
692 struct rb_node
*parent
= NULL
;
693 sector_t s
= node
->bio
->bi_sector
;
694 struct pkt_rb_node
*tmp
;
698 tmp
= rb_entry(parent
, struct pkt_rb_node
, rb_node
);
699 if (s
< tmp
->bio
->bi_sector
)
704 rb_link_node(&node
->rb_node
, parent
, p
);
705 rb_insert_color(&node
->rb_node
, &pd
->bio_queue
);
706 pd
->bio_queue_size
++;
710 * Send a packet_command to the underlying block device and
711 * wait for completion.
713 static int pkt_generic_packet(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
715 struct request_queue
*q
= bdev_get_queue(pd
->bdev
);
719 rq
= blk_get_request(q
, (cgc
->data_direction
== CGC_DATA_WRITE
) ?
720 WRITE
: READ
, __GFP_WAIT
);
723 if (blk_rq_map_kern(q
, rq
, cgc
->buffer
, cgc
->buflen
, __GFP_WAIT
))
727 rq
->cmd_len
= COMMAND_SIZE(cgc
->cmd
[0]);
728 memcpy(rq
->cmd
, cgc
->cmd
, CDROM_PACKET_SIZE
);
731 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
733 rq
->cmd_flags
|= REQ_QUIET
;
735 blk_execute_rq(rq
->q
, pd
->bdev
->bd_disk
, rq
, 0);
743 static const char *sense_key_string(__u8 index
)
745 static const char * const info
[] = {
746 "No sense", "Recovered error", "Not ready",
747 "Medium error", "Hardware error", "Illegal request",
748 "Unit attention", "Data protect", "Blank check",
751 return index
< ARRAY_SIZE(info
) ? info
[index
] : "INVALID";
755 * A generic sense dump / resolve mechanism should be implemented across
756 * all ATAPI + SCSI devices.
758 static void pkt_dump_sense(struct packet_command
*cgc
)
760 struct request_sense
*sense
= cgc
->sense
;
763 pr_err("%*ph - sense %02x.%02x.%02x (%s)\n",
764 CDROM_PACKET_SIZE
, cgc
->cmd
,
765 sense
->sense_key
, sense
->asc
, sense
->ascq
,
766 sense_key_string(sense
->sense_key
));
768 pr_err("%*ph - no sense\n", CDROM_PACKET_SIZE
, cgc
->cmd
);
772 * flush the drive cache to media
774 static int pkt_flush_cache(struct pktcdvd_device
*pd
)
776 struct packet_command cgc
;
778 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
779 cgc
.cmd
[0] = GPCMD_FLUSH_CACHE
;
783 * the IMMED bit -- we default to not setting it, although that
784 * would allow a much faster close, this is safer
789 return pkt_generic_packet(pd
, &cgc
);
793 * speed is given as the normal factor, e.g. 4 for 4x
795 static noinline_for_stack
int pkt_set_speed(struct pktcdvd_device
*pd
,
796 unsigned write_speed
, unsigned read_speed
)
798 struct packet_command cgc
;
799 struct request_sense sense
;
802 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
804 cgc
.cmd
[0] = GPCMD_SET_SPEED
;
805 cgc
.cmd
[2] = (read_speed
>> 8) & 0xff;
806 cgc
.cmd
[3] = read_speed
& 0xff;
807 cgc
.cmd
[4] = (write_speed
>> 8) & 0xff;
808 cgc
.cmd
[5] = write_speed
& 0xff;
810 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
811 pkt_dump_sense(&cgc
);
817 * Queue a bio for processing by the low-level CD device. Must be called
818 * from process context.
820 static void pkt_queue_bio(struct pktcdvd_device
*pd
, struct bio
*bio
)
822 spin_lock(&pd
->iosched
.lock
);
823 if (bio_data_dir(bio
) == READ
)
824 bio_list_add(&pd
->iosched
.read_queue
, bio
);
826 bio_list_add(&pd
->iosched
.write_queue
, bio
);
827 spin_unlock(&pd
->iosched
.lock
);
829 atomic_set(&pd
->iosched
.attention
, 1);
830 wake_up(&pd
->wqueue
);
834 * Process the queued read/write requests. This function handles special
835 * requirements for CDRW drives:
836 * - A cache flush command must be inserted before a read request if the
837 * previous request was a write.
838 * - Switching between reading and writing is slow, so don't do it more often
840 * - Optimize for throughput at the expense of latency. This means that streaming
841 * writes will never be interrupted by a read, but if the drive has to seek
842 * before the next write, switch to reading instead if there are any pending
844 * - Set the read speed according to current usage pattern. When only reading
845 * from the device, it's best to use the highest possible read speed, but
846 * when switching often between reading and writing, it's better to have the
847 * same read and write speeds.
849 static void pkt_iosched_process_queue(struct pktcdvd_device
*pd
)
852 if (atomic_read(&pd
->iosched
.attention
) == 0)
854 atomic_set(&pd
->iosched
.attention
, 0);
858 int reads_queued
, writes_queued
;
860 spin_lock(&pd
->iosched
.lock
);
861 reads_queued
= !bio_list_empty(&pd
->iosched
.read_queue
);
862 writes_queued
= !bio_list_empty(&pd
->iosched
.write_queue
);
863 spin_unlock(&pd
->iosched
.lock
);
865 if (!reads_queued
&& !writes_queued
)
868 if (pd
->iosched
.writing
) {
869 int need_write_seek
= 1;
870 spin_lock(&pd
->iosched
.lock
);
871 bio
= bio_list_peek(&pd
->iosched
.write_queue
);
872 spin_unlock(&pd
->iosched
.lock
);
873 if (bio
&& (bio
->bi_sector
== pd
->iosched
.last_write
))
875 if (need_write_seek
&& reads_queued
) {
876 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
877 pkt_dbg(2, pd
, "write, waiting\n");
881 pd
->iosched
.writing
= 0;
884 if (!reads_queued
&& writes_queued
) {
885 if (atomic_read(&pd
->cdrw
.pending_bios
) > 0) {
886 pkt_dbg(2, pd
, "read, waiting\n");
889 pd
->iosched
.writing
= 1;
893 spin_lock(&pd
->iosched
.lock
);
894 if (pd
->iosched
.writing
)
895 bio
= bio_list_pop(&pd
->iosched
.write_queue
);
897 bio
= bio_list_pop(&pd
->iosched
.read_queue
);
898 spin_unlock(&pd
->iosched
.lock
);
903 if (bio_data_dir(bio
) == READ
)
904 pd
->iosched
.successive_reads
+= bio
->bi_size
>> 10;
906 pd
->iosched
.successive_reads
= 0;
907 pd
->iosched
.last_write
= bio_end_sector(bio
);
909 if (pd
->iosched
.successive_reads
>= HI_SPEED_SWITCH
) {
910 if (pd
->read_speed
== pd
->write_speed
) {
911 pd
->read_speed
= MAX_SPEED
;
912 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
915 if (pd
->read_speed
!= pd
->write_speed
) {
916 pd
->read_speed
= pd
->write_speed
;
917 pkt_set_speed(pd
, pd
->write_speed
, pd
->read_speed
);
921 atomic_inc(&pd
->cdrw
.pending_bios
);
922 generic_make_request(bio
);
927 * Special care is needed if the underlying block device has a small
928 * max_phys_segments value.
930 static int pkt_set_segment_merging(struct pktcdvd_device
*pd
, struct request_queue
*q
)
932 if ((pd
->settings
.size
<< 9) / CD_FRAMESIZE
933 <= queue_max_segments(q
)) {
935 * The cdrom device can handle one segment/frame
937 clear_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
939 } else if ((pd
->settings
.size
<< 9) / PAGE_SIZE
940 <= queue_max_segments(q
)) {
942 * We can handle this case at the expense of some extra memory
943 * copies during write operations
945 set_bit(PACKET_MERGE_SEGS
, &pd
->flags
);
948 pkt_err(pd
, "cdrom max_phys_segments too small\n");
954 * Copy all data for this packet to pkt->pages[], so that
955 * a) The number of required segments for the write bio is minimized, which
956 * is necessary for some scsi controllers.
957 * b) The data can be used as cache to avoid read requests if we receive a
958 * new write request for the same zone.
960 static void pkt_make_local_copy(struct packet_data
*pkt
, struct bio_vec
*bvec
)
964 /* Copy all data to pkt->pages[] */
967 for (f
= 0; f
< pkt
->frames
; f
++) {
968 if (bvec
[f
].bv_page
!= pkt
->pages
[p
]) {
969 void *vfrom
= kmap_atomic(bvec
[f
].bv_page
) + bvec
[f
].bv_offset
;
970 void *vto
= page_address(pkt
->pages
[p
]) + offs
;
971 memcpy(vto
, vfrom
, CD_FRAMESIZE
);
972 kunmap_atomic(vfrom
);
973 bvec
[f
].bv_page
= pkt
->pages
[p
];
974 bvec
[f
].bv_offset
= offs
;
976 BUG_ON(bvec
[f
].bv_offset
!= offs
);
978 offs
+= CD_FRAMESIZE
;
979 if (offs
>= PAGE_SIZE
) {
986 static void pkt_end_io_read(struct bio
*bio
, int err
)
988 struct packet_data
*pkt
= bio
->bi_private
;
989 struct pktcdvd_device
*pd
= pkt
->pd
;
992 pkt_dbg(2, pd
, "bio=%p sec0=%llx sec=%llx err=%d\n",
993 bio
, (unsigned long long)pkt
->sector
,
994 (unsigned long long)bio
->bi_sector
, err
);
997 atomic_inc(&pkt
->io_errors
);
998 if (atomic_dec_and_test(&pkt
->io_wait
)) {
999 atomic_inc(&pkt
->run_sm
);
1000 wake_up(&pd
->wqueue
);
1002 pkt_bio_finished(pd
);
1005 static void pkt_end_io_packet_write(struct bio
*bio
, int err
)
1007 struct packet_data
*pkt
= bio
->bi_private
;
1008 struct pktcdvd_device
*pd
= pkt
->pd
;
1011 pkt_dbg(2, pd
, "id=%d, err=%d\n", pkt
->id
, err
);
1013 pd
->stats
.pkt_ended
++;
1015 pkt_bio_finished(pd
);
1016 atomic_dec(&pkt
->io_wait
);
1017 atomic_inc(&pkt
->run_sm
);
1018 wake_up(&pd
->wqueue
);
1022 * Schedule reads for the holes in a packet
1024 static void pkt_gather_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1026 int frames_read
= 0;
1029 char written
[PACKET_MAX_SIZE
];
1031 BUG_ON(bio_list_empty(&pkt
->orig_bios
));
1033 atomic_set(&pkt
->io_wait
, 0);
1034 atomic_set(&pkt
->io_errors
, 0);
1037 * Figure out which frames we need to read before we can write.
1039 memset(written
, 0, sizeof(written
));
1040 spin_lock(&pkt
->lock
);
1041 bio_list_for_each(bio
, &pkt
->orig_bios
) {
1042 int first_frame
= (bio
->bi_sector
- pkt
->sector
) / (CD_FRAMESIZE
>> 9);
1043 int num_frames
= bio
->bi_size
/ CD_FRAMESIZE
;
1044 pd
->stats
.secs_w
+= num_frames
* (CD_FRAMESIZE
>> 9);
1045 BUG_ON(first_frame
< 0);
1046 BUG_ON(first_frame
+ num_frames
> pkt
->frames
);
1047 for (f
= first_frame
; f
< first_frame
+ num_frames
; f
++)
1050 spin_unlock(&pkt
->lock
);
1052 if (pkt
->cache_valid
) {
1053 pkt_dbg(2, pd
, "zone %llx cached\n",
1054 (unsigned long long)pkt
->sector
);
1059 * Schedule reads for missing parts of the packet.
1061 for (f
= 0; f
< pkt
->frames
; f
++) {
1067 bio
= pkt
->r_bios
[f
];
1069 bio
->bi_sector
= pkt
->sector
+ f
* (CD_FRAMESIZE
>> 9);
1070 bio
->bi_bdev
= pd
->bdev
;
1071 bio
->bi_end_io
= pkt_end_io_read
;
1072 bio
->bi_private
= pkt
;
1074 p
= (f
* CD_FRAMESIZE
) / PAGE_SIZE
;
1075 offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1076 pkt_dbg(2, pd
, "Adding frame %d, page:%p offs:%d\n",
1077 f
, pkt
->pages
[p
], offset
);
1078 if (!bio_add_page(bio
, pkt
->pages
[p
], CD_FRAMESIZE
, offset
))
1081 atomic_inc(&pkt
->io_wait
);
1083 pkt_queue_bio(pd
, bio
);
1088 pkt_dbg(2, pd
, "need %d frames for zone %llx\n",
1089 frames_read
, (unsigned long long)pkt
->sector
);
1090 pd
->stats
.pkt_started
++;
1091 pd
->stats
.secs_rg
+= frames_read
* (CD_FRAMESIZE
>> 9);
1095 * Find a packet matching zone, or the least recently used packet if
1096 * there is no match.
1098 static struct packet_data
*pkt_get_packet_data(struct pktcdvd_device
*pd
, int zone
)
1100 struct packet_data
*pkt
;
1102 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_free_list
, list
) {
1103 if (pkt
->sector
== zone
|| pkt
->list
.next
== &pd
->cdrw
.pkt_free_list
) {
1104 list_del_init(&pkt
->list
);
1105 if (pkt
->sector
!= zone
)
1106 pkt
->cache_valid
= 0;
1114 static void pkt_put_packet_data(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1116 if (pkt
->cache_valid
) {
1117 list_add(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1119 list_add_tail(&pkt
->list
, &pd
->cdrw
.pkt_free_list
);
1124 * recover a failed write, query for relocation if possible
1126 * returns 1 if recovery is possible, or 0 if not
1129 static int pkt_start_recovery(struct packet_data
*pkt
)
1132 * FIXME. We need help from the file system to implement
1133 * recovery handling.
1137 struct request
*rq
= pkt
->rq
;
1138 struct pktcdvd_device
*pd
= rq
->rq_disk
->private_data
;
1139 struct block_device
*pkt_bdev
;
1140 struct super_block
*sb
= NULL
;
1141 unsigned long old_block
, new_block
;
1142 sector_t new_sector
;
1144 pkt_bdev
= bdget(kdev_t_to_nr(pd
->pkt_dev
));
1146 sb
= get_super(pkt_bdev
);
1153 if (!sb
->s_op
->relocate_blocks
)
1156 old_block
= pkt
->sector
/ (CD_FRAMESIZE
>> 9);
1157 if (sb
->s_op
->relocate_blocks(sb
, old_block
, &new_block
))
1160 new_sector
= new_block
* (CD_FRAMESIZE
>> 9);
1161 pkt
->sector
= new_sector
;
1163 bio_reset(pkt
->bio
);
1164 pkt
->bio
->bi_bdev
= pd
->bdev
;
1165 pkt
->bio
->bi_rw
= REQ_WRITE
;
1166 pkt
->bio
->bi_sector
= new_sector
;
1167 pkt
->bio
->bi_size
= pkt
->frames
* CD_FRAMESIZE
;
1168 pkt
->bio
->bi_vcnt
= pkt
->frames
;
1170 pkt
->bio
->bi_end_io
= pkt_end_io_packet_write
;
1171 pkt
->bio
->bi_private
= pkt
;
1182 static inline void pkt_set_state(struct packet_data
*pkt
, enum packet_data_state state
)
1184 #if PACKET_DEBUG > 1
1185 static const char *state_name
[] = {
1186 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1188 enum packet_data_state old_state
= pkt
->state
;
1189 pkt_dbg(2, pd
, "pkt %2d : s=%6llx %s -> %s\n",
1190 pkt
->id
, (unsigned long long)pkt
->sector
,
1191 state_name
[old_state
], state_name
[state
]);
1197 * Scan the work queue to see if we can start a new packet.
1198 * returns non-zero if any work was done.
1200 static int pkt_handle_queue(struct pktcdvd_device
*pd
)
1202 struct packet_data
*pkt
, *p
;
1203 struct bio
*bio
= NULL
;
1204 sector_t zone
= 0; /* Suppress gcc warning */
1205 struct pkt_rb_node
*node
, *first_node
;
1209 atomic_set(&pd
->scan_queue
, 0);
1211 if (list_empty(&pd
->cdrw
.pkt_free_list
)) {
1212 pkt_dbg(2, pd
, "no pkt\n");
1217 * Try to find a zone we are not already working on.
1219 spin_lock(&pd
->lock
);
1220 first_node
= pkt_rbtree_find(pd
, pd
->current_sector
);
1222 n
= rb_first(&pd
->bio_queue
);
1224 first_node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1229 zone
= get_zone(bio
->bi_sector
, pd
);
1230 list_for_each_entry(p
, &pd
->cdrw
.pkt_active_list
, list
) {
1231 if (p
->sector
== zone
) {
1238 node
= pkt_rbtree_next(node
);
1240 n
= rb_first(&pd
->bio_queue
);
1242 node
= rb_entry(n
, struct pkt_rb_node
, rb_node
);
1244 if (node
== first_node
)
1247 spin_unlock(&pd
->lock
);
1249 pkt_dbg(2, pd
, "no bio\n");
1253 pkt
= pkt_get_packet_data(pd
, zone
);
1255 pd
->current_sector
= zone
+ pd
->settings
.size
;
1257 BUG_ON(pkt
->frames
!= pd
->settings
.size
>> 2);
1258 pkt
->write_size
= 0;
1261 * Scan work queue for bios in the same zone and link them
1264 spin_lock(&pd
->lock
);
1265 pkt_dbg(2, pd
, "looking for zone %llx\n", (unsigned long long)zone
);
1266 while ((node
= pkt_rbtree_find(pd
, zone
)) != NULL
) {
1268 pkt_dbg(2, pd
, "found zone=%llx\n",
1269 (unsigned long long)get_zone(bio
->bi_sector
, pd
));
1270 if (get_zone(bio
->bi_sector
, pd
) != zone
)
1272 pkt_rbtree_erase(pd
, node
);
1273 spin_lock(&pkt
->lock
);
1274 bio_list_add(&pkt
->orig_bios
, bio
);
1275 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
1276 spin_unlock(&pkt
->lock
);
1278 /* check write congestion marks, and if bio_queue_size is
1279 below, wake up any waiters */
1280 wakeup
= (pd
->write_congestion_on
> 0
1281 && pd
->bio_queue_size
<= pd
->write_congestion_off
);
1282 spin_unlock(&pd
->lock
);
1284 clear_bdi_congested(&pd
->disk
->queue
->backing_dev_info
,
1288 pkt
->sleep_time
= max(PACKET_WAIT_TIME
, 1);
1289 pkt_set_state(pkt
, PACKET_WAITING_STATE
);
1290 atomic_set(&pkt
->run_sm
, 1);
1292 spin_lock(&pd
->cdrw
.active_list_lock
);
1293 list_add(&pkt
->list
, &pd
->cdrw
.pkt_active_list
);
1294 spin_unlock(&pd
->cdrw
.active_list_lock
);
1300 * Assemble a bio to write one packet and queue the bio for processing
1301 * by the underlying block device.
1303 static void pkt_start_write(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1306 struct bio_vec
*bvec
= pkt
->w_bio
->bi_io_vec
;
1308 bio_reset(pkt
->w_bio
);
1309 pkt
->w_bio
->bi_sector
= pkt
->sector
;
1310 pkt
->w_bio
->bi_bdev
= pd
->bdev
;
1311 pkt
->w_bio
->bi_end_io
= pkt_end_io_packet_write
;
1312 pkt
->w_bio
->bi_private
= pkt
;
1315 for (f
= 0; f
< pkt
->frames
; f
++) {
1316 bvec
[f
].bv_page
= pkt
->pages
[(f
* CD_FRAMESIZE
) / PAGE_SIZE
];
1317 bvec
[f
].bv_offset
= (f
* CD_FRAMESIZE
) % PAGE_SIZE
;
1318 if (!bio_add_page(pkt
->w_bio
, bvec
[f
].bv_page
, CD_FRAMESIZE
, bvec
[f
].bv_offset
))
1321 pkt_dbg(2, pd
, "vcnt=%d\n", pkt
->w_bio
->bi_vcnt
);
1324 * Fill-in bvec with data from orig_bios.
1326 spin_lock(&pkt
->lock
);
1327 bio_copy_data(pkt
->w_bio
, pkt
->orig_bios
.head
);
1329 pkt_set_state(pkt
, PACKET_WRITE_WAIT_STATE
);
1330 spin_unlock(&pkt
->lock
);
1332 pkt_dbg(2, pd
, "Writing %d frames for zone %llx\n",
1333 pkt
->write_size
, (unsigned long long)pkt
->sector
);
1335 if (test_bit(PACKET_MERGE_SEGS
, &pd
->flags
) || (pkt
->write_size
< pkt
->frames
)) {
1336 pkt_make_local_copy(pkt
, bvec
);
1337 pkt
->cache_valid
= 1;
1339 pkt
->cache_valid
= 0;
1342 /* Start the write request */
1343 atomic_set(&pkt
->io_wait
, 1);
1344 pkt
->w_bio
->bi_rw
= WRITE
;
1345 pkt_queue_bio(pd
, pkt
->w_bio
);
1348 static void pkt_finish_packet(struct packet_data
*pkt
, int uptodate
)
1353 pkt
->cache_valid
= 0;
1355 /* Finish all bios corresponding to this packet */
1356 while ((bio
= bio_list_pop(&pkt
->orig_bios
)))
1357 bio_endio(bio
, uptodate
? 0 : -EIO
);
1360 static void pkt_run_state_machine(struct pktcdvd_device
*pd
, struct packet_data
*pkt
)
1364 pkt_dbg(2, pd
, "pkt %d\n", pkt
->id
);
1367 switch (pkt
->state
) {
1368 case PACKET_WAITING_STATE
:
1369 if ((pkt
->write_size
< pkt
->frames
) && (pkt
->sleep_time
> 0))
1372 pkt
->sleep_time
= 0;
1373 pkt_gather_data(pd
, pkt
);
1374 pkt_set_state(pkt
, PACKET_READ_WAIT_STATE
);
1377 case PACKET_READ_WAIT_STATE
:
1378 if (atomic_read(&pkt
->io_wait
) > 0)
1381 if (atomic_read(&pkt
->io_errors
) > 0) {
1382 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1384 pkt_start_write(pd
, pkt
);
1388 case PACKET_WRITE_WAIT_STATE
:
1389 if (atomic_read(&pkt
->io_wait
) > 0)
1392 if (test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
)) {
1393 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1395 pkt_set_state(pkt
, PACKET_RECOVERY_STATE
);
1399 case PACKET_RECOVERY_STATE
:
1400 if (pkt_start_recovery(pkt
)) {
1401 pkt_start_write(pd
, pkt
);
1403 pkt_dbg(2, pd
, "No recovery possible\n");
1404 pkt_set_state(pkt
, PACKET_FINISHED_STATE
);
1408 case PACKET_FINISHED_STATE
:
1409 uptodate
= test_bit(BIO_UPTODATE
, &pkt
->w_bio
->bi_flags
);
1410 pkt_finish_packet(pkt
, uptodate
);
1420 static void pkt_handle_packets(struct pktcdvd_device
*pd
)
1422 struct packet_data
*pkt
, *next
;
1425 * Run state machine for active packets
1427 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1428 if (atomic_read(&pkt
->run_sm
) > 0) {
1429 atomic_set(&pkt
->run_sm
, 0);
1430 pkt_run_state_machine(pd
, pkt
);
1435 * Move no longer active packets to the free list
1437 spin_lock(&pd
->cdrw
.active_list_lock
);
1438 list_for_each_entry_safe(pkt
, next
, &pd
->cdrw
.pkt_active_list
, list
) {
1439 if (pkt
->state
== PACKET_FINISHED_STATE
) {
1440 list_del(&pkt
->list
);
1441 pkt_put_packet_data(pd
, pkt
);
1442 pkt_set_state(pkt
, PACKET_IDLE_STATE
);
1443 atomic_set(&pd
->scan_queue
, 1);
1446 spin_unlock(&pd
->cdrw
.active_list_lock
);
1449 static void pkt_count_states(struct pktcdvd_device
*pd
, int *states
)
1451 struct packet_data
*pkt
;
1454 for (i
= 0; i
< PACKET_NUM_STATES
; i
++)
1457 spin_lock(&pd
->cdrw
.active_list_lock
);
1458 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1459 states
[pkt
->state
]++;
1461 spin_unlock(&pd
->cdrw
.active_list_lock
);
1465 * kcdrwd is woken up when writes have been queued for one of our
1466 * registered devices
1468 static int kcdrwd(void *foobar
)
1470 struct pktcdvd_device
*pd
= foobar
;
1471 struct packet_data
*pkt
;
1472 long min_sleep_time
, residue
;
1474 set_user_nice(current
, -20);
1478 DECLARE_WAITQUEUE(wait
, current
);
1481 * Wait until there is something to do
1483 add_wait_queue(&pd
->wqueue
, &wait
);
1485 set_current_state(TASK_INTERRUPTIBLE
);
1487 /* Check if we need to run pkt_handle_queue */
1488 if (atomic_read(&pd
->scan_queue
) > 0)
1491 /* Check if we need to run the state machine for some packet */
1492 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1493 if (atomic_read(&pkt
->run_sm
) > 0)
1497 /* Check if we need to process the iosched queues */
1498 if (atomic_read(&pd
->iosched
.attention
) != 0)
1501 /* Otherwise, go to sleep */
1502 if (PACKET_DEBUG
> 1) {
1503 int states
[PACKET_NUM_STATES
];
1504 pkt_count_states(pd
, states
);
1505 pkt_dbg(2, pd
, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1506 states
[0], states
[1], states
[2],
1507 states
[3], states
[4], states
[5]);
1510 min_sleep_time
= MAX_SCHEDULE_TIMEOUT
;
1511 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1512 if (pkt
->sleep_time
&& pkt
->sleep_time
< min_sleep_time
)
1513 min_sleep_time
= pkt
->sleep_time
;
1516 pkt_dbg(2, pd
, "sleeping\n");
1517 residue
= schedule_timeout(min_sleep_time
);
1518 pkt_dbg(2, pd
, "wake up\n");
1520 /* make swsusp happy with our thread */
1523 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
1524 if (!pkt
->sleep_time
)
1526 pkt
->sleep_time
-= min_sleep_time
- residue
;
1527 if (pkt
->sleep_time
<= 0) {
1528 pkt
->sleep_time
= 0;
1529 atomic_inc(&pkt
->run_sm
);
1533 if (kthread_should_stop())
1537 set_current_state(TASK_RUNNING
);
1538 remove_wait_queue(&pd
->wqueue
, &wait
);
1540 if (kthread_should_stop())
1544 * if pkt_handle_queue returns true, we can queue
1547 while (pkt_handle_queue(pd
))
1551 * Handle packet state machine
1553 pkt_handle_packets(pd
);
1556 * Handle iosched queues
1558 pkt_iosched_process_queue(pd
);
1564 static void pkt_print_settings(struct pktcdvd_device
*pd
)
1566 pkt_info(pd
, "%s packets, %u blocks, Mode-%c disc\n",
1567 pd
->settings
.fp
? "Fixed" : "Variable",
1568 pd
->settings
.size
>> 2,
1569 pd
->settings
.block_mode
== 8 ? '1' : '2');
1572 static int pkt_mode_sense(struct pktcdvd_device
*pd
, struct packet_command
*cgc
, int page_code
, int page_control
)
1574 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1576 cgc
->cmd
[0] = GPCMD_MODE_SENSE_10
;
1577 cgc
->cmd
[2] = page_code
| (page_control
<< 6);
1578 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1579 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1580 cgc
->data_direction
= CGC_DATA_READ
;
1581 return pkt_generic_packet(pd
, cgc
);
1584 static int pkt_mode_select(struct pktcdvd_device
*pd
, struct packet_command
*cgc
)
1586 memset(cgc
->cmd
, 0, sizeof(cgc
->cmd
));
1587 memset(cgc
->buffer
, 0, 2);
1588 cgc
->cmd
[0] = GPCMD_MODE_SELECT_10
;
1589 cgc
->cmd
[1] = 0x10; /* PF */
1590 cgc
->cmd
[7] = cgc
->buflen
>> 8;
1591 cgc
->cmd
[8] = cgc
->buflen
& 0xff;
1592 cgc
->data_direction
= CGC_DATA_WRITE
;
1593 return pkt_generic_packet(pd
, cgc
);
1596 static int pkt_get_disc_info(struct pktcdvd_device
*pd
, disc_information
*di
)
1598 struct packet_command cgc
;
1601 /* set up command and get the disc info */
1602 init_cdrom_command(&cgc
, di
, sizeof(*di
), CGC_DATA_READ
);
1603 cgc
.cmd
[0] = GPCMD_READ_DISC_INFO
;
1604 cgc
.cmd
[8] = cgc
.buflen
= 2;
1607 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1610 /* not all drives have the same disc_info length, so requeue
1611 * packet with the length the drive tells us it can supply
1613 cgc
.buflen
= be16_to_cpu(di
->disc_information_length
) +
1614 sizeof(di
->disc_information_length
);
1616 if (cgc
.buflen
> sizeof(disc_information
))
1617 cgc
.buflen
= sizeof(disc_information
);
1619 cgc
.cmd
[8] = cgc
.buflen
;
1620 return pkt_generic_packet(pd
, &cgc
);
1623 static int pkt_get_track_info(struct pktcdvd_device
*pd
, __u16 track
, __u8 type
, track_information
*ti
)
1625 struct packet_command cgc
;
1628 init_cdrom_command(&cgc
, ti
, 8, CGC_DATA_READ
);
1629 cgc
.cmd
[0] = GPCMD_READ_TRACK_RZONE_INFO
;
1630 cgc
.cmd
[1] = type
& 3;
1631 cgc
.cmd
[4] = (track
& 0xff00) >> 8;
1632 cgc
.cmd
[5] = track
& 0xff;
1636 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
1639 cgc
.buflen
= be16_to_cpu(ti
->track_information_length
) +
1640 sizeof(ti
->track_information_length
);
1642 if (cgc
.buflen
> sizeof(track_information
))
1643 cgc
.buflen
= sizeof(track_information
);
1645 cgc
.cmd
[8] = cgc
.buflen
;
1646 return pkt_generic_packet(pd
, &cgc
);
1649 static noinline_for_stack
int pkt_get_last_written(struct pktcdvd_device
*pd
,
1652 disc_information di
;
1653 track_information ti
;
1657 if ((ret
= pkt_get_disc_info(pd
, &di
)))
1660 last_track
= (di
.last_track_msb
<< 8) | di
.last_track_lsb
;
1661 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1664 /* if this track is blank, try the previous. */
1667 if ((ret
= pkt_get_track_info(pd
, last_track
, 1, &ti
)))
1671 /* if last recorded field is valid, return it. */
1673 *last_written
= be32_to_cpu(ti
.last_rec_address
);
1675 /* make it up instead */
1676 *last_written
= be32_to_cpu(ti
.track_start
) +
1677 be32_to_cpu(ti
.track_size
);
1679 *last_written
-= (be32_to_cpu(ti
.free_blocks
) + 7);
1685 * write mode select package based on pd->settings
1687 static noinline_for_stack
int pkt_set_write_settings(struct pktcdvd_device
*pd
)
1689 struct packet_command cgc
;
1690 struct request_sense sense
;
1691 write_param_page
*wp
;
1695 /* doesn't apply to DVD+RW or DVD-RAM */
1696 if ((pd
->mmc3_profile
== 0x1a) || (pd
->mmc3_profile
== 0x12))
1699 memset(buffer
, 0, sizeof(buffer
));
1700 init_cdrom_command(&cgc
, buffer
, sizeof(*wp
), CGC_DATA_READ
);
1702 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1703 pkt_dump_sense(&cgc
);
1707 size
= 2 + ((buffer
[0] << 8) | (buffer
[1] & 0xff));
1708 pd
->mode_offset
= (buffer
[6] << 8) | (buffer
[7] & 0xff);
1709 if (size
> sizeof(buffer
))
1710 size
= sizeof(buffer
);
1715 init_cdrom_command(&cgc
, buffer
, size
, CGC_DATA_READ
);
1717 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WRITE_PARMS_PAGE
, 0))) {
1718 pkt_dump_sense(&cgc
);
1723 * write page is offset header + block descriptor length
1725 wp
= (write_param_page
*) &buffer
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
1727 wp
->fp
= pd
->settings
.fp
;
1728 wp
->track_mode
= pd
->settings
.track_mode
;
1729 wp
->write_type
= pd
->settings
.write_type
;
1730 wp
->data_block_type
= pd
->settings
.block_mode
;
1732 wp
->multi_session
= 0;
1734 #ifdef PACKET_USE_LS
1739 if (wp
->data_block_type
== PACKET_BLOCK_MODE1
) {
1740 wp
->session_format
= 0;
1742 } else if (wp
->data_block_type
== PACKET_BLOCK_MODE2
) {
1743 wp
->session_format
= 0x20;
1747 memcpy(&wp
->mcn
[1], PACKET_MCN
, sizeof(wp
->mcn
) - 1);
1753 pkt_err(pd
, "write mode wrong %d\n", wp
->data_block_type
);
1756 wp
->packet_size
= cpu_to_be32(pd
->settings
.size
>> 2);
1758 cgc
.buflen
= cgc
.cmd
[8] = size
;
1759 if ((ret
= pkt_mode_select(pd
, &cgc
))) {
1760 pkt_dump_sense(&cgc
);
1764 pkt_print_settings(pd
);
1769 * 1 -- we can write to this track, 0 -- we can't
1771 static int pkt_writable_track(struct pktcdvd_device
*pd
, track_information
*ti
)
1773 switch (pd
->mmc3_profile
) {
1774 case 0x1a: /* DVD+RW */
1775 case 0x12: /* DVD-RAM */
1776 /* The track is always writable on DVD+RW/DVD-RAM */
1782 if (!ti
->packet
|| !ti
->fp
)
1786 * "good" settings as per Mt Fuji.
1788 if (ti
->rt
== 0 && ti
->blank
== 0)
1791 if (ti
->rt
== 0 && ti
->blank
== 1)
1794 if (ti
->rt
== 1 && ti
->blank
== 0)
1797 pkt_err(pd
, "bad state %d-%d-%d\n", ti
->rt
, ti
->blank
, ti
->packet
);
1802 * 1 -- we can write to this disc, 0 -- we can't
1804 static int pkt_writable_disc(struct pktcdvd_device
*pd
, disc_information
*di
)
1806 switch (pd
->mmc3_profile
) {
1807 case 0x0a: /* CD-RW */
1808 case 0xffff: /* MMC3 not supported */
1810 case 0x1a: /* DVD+RW */
1811 case 0x13: /* DVD-RW */
1812 case 0x12: /* DVD-RAM */
1815 pkt_dbg(2, pd
, "Wrong disc profile (%x)\n",
1821 * for disc type 0xff we should probably reserve a new track.
1822 * but i'm not sure, should we leave this to user apps? probably.
1824 if (di
->disc_type
== 0xff) {
1825 pkt_notice(pd
, "unknown disc - no track?\n");
1829 if (di
->disc_type
!= 0x20 && di
->disc_type
!= 0) {
1830 pkt_err(pd
, "wrong disc type (%x)\n", di
->disc_type
);
1834 if (di
->erasable
== 0) {
1835 pkt_notice(pd
, "disc not erasable\n");
1839 if (di
->border_status
== PACKET_SESSION_RESERVED
) {
1840 pkt_err(pd
, "can't write to last track (reserved)\n");
1847 static noinline_for_stack
int pkt_probe_settings(struct pktcdvd_device
*pd
)
1849 struct packet_command cgc
;
1850 unsigned char buf
[12];
1851 disc_information di
;
1852 track_information ti
;
1855 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1856 cgc
.cmd
[0] = GPCMD_GET_CONFIGURATION
;
1858 ret
= pkt_generic_packet(pd
, &cgc
);
1859 pd
->mmc3_profile
= ret
? 0xffff : buf
[6] << 8 | buf
[7];
1861 memset(&di
, 0, sizeof(disc_information
));
1862 memset(&ti
, 0, sizeof(track_information
));
1864 if ((ret
= pkt_get_disc_info(pd
, &di
))) {
1865 pkt_err(pd
, "failed get_disc\n");
1869 if (!pkt_writable_disc(pd
, &di
))
1872 pd
->type
= di
.erasable
? PACKET_CDRW
: PACKET_CDR
;
1874 track
= 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1875 if ((ret
= pkt_get_track_info(pd
, track
, 1, &ti
))) {
1876 pkt_err(pd
, "failed get_track\n");
1880 if (!pkt_writable_track(pd
, &ti
)) {
1881 pkt_err(pd
, "can't write to this track\n");
1886 * we keep packet size in 512 byte units, makes it easier to
1887 * deal with request calculations.
1889 pd
->settings
.size
= be32_to_cpu(ti
.fixed_packet_size
) << 2;
1890 if (pd
->settings
.size
== 0) {
1891 pkt_notice(pd
, "detected zero packet size!\n");
1894 if (pd
->settings
.size
> PACKET_MAX_SECTORS
) {
1895 pkt_err(pd
, "packet size is too big\n");
1898 pd
->settings
.fp
= ti
.fp
;
1899 pd
->offset
= (be32_to_cpu(ti
.track_start
) << 2) & (pd
->settings
.size
- 1);
1902 pd
->nwa
= be32_to_cpu(ti
.next_writable
);
1903 set_bit(PACKET_NWA_VALID
, &pd
->flags
);
1907 * in theory we could use lra on -RW media as well and just zero
1908 * blocks that haven't been written yet, but in practice that
1909 * is just a no-go. we'll use that for -R, naturally.
1912 pd
->lra
= be32_to_cpu(ti
.last_rec_address
);
1913 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
1915 pd
->lra
= 0xffffffff;
1916 set_bit(PACKET_LRA_VALID
, &pd
->flags
);
1922 pd
->settings
.link_loss
= 7;
1923 pd
->settings
.write_type
= 0; /* packet */
1924 pd
->settings
.track_mode
= ti
.track_mode
;
1927 * mode1 or mode2 disc
1929 switch (ti
.data_mode
) {
1931 pd
->settings
.block_mode
= PACKET_BLOCK_MODE1
;
1934 pd
->settings
.block_mode
= PACKET_BLOCK_MODE2
;
1937 pkt_err(pd
, "unknown data mode\n");
1944 * enable/disable write caching on drive
1946 static noinline_for_stack
int pkt_write_caching(struct pktcdvd_device
*pd
,
1949 struct packet_command cgc
;
1950 struct request_sense sense
;
1951 unsigned char buf
[64];
1954 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_READ
);
1956 cgc
.buflen
= pd
->mode_offset
+ 12;
1959 * caching mode page might not be there, so quiet this command
1963 if ((ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_WCACHING_PAGE
, 0)))
1966 buf
[pd
->mode_offset
+ 10] |= (!!set
<< 2);
1968 cgc
.buflen
= cgc
.cmd
[8] = 2 + ((buf
[0] << 8) | (buf
[1] & 0xff));
1969 ret
= pkt_mode_select(pd
, &cgc
);
1971 pkt_err(pd
, "write caching control failed\n");
1972 pkt_dump_sense(&cgc
);
1973 } else if (!ret
&& set
)
1974 pkt_notice(pd
, "enabled write caching\n");
1978 static int pkt_lock_door(struct pktcdvd_device
*pd
, int lockflag
)
1980 struct packet_command cgc
;
1982 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
1983 cgc
.cmd
[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL
;
1984 cgc
.cmd
[4] = lockflag
? 1 : 0;
1985 return pkt_generic_packet(pd
, &cgc
);
1989 * Returns drive maximum write speed
1991 static noinline_for_stack
int pkt_get_max_speed(struct pktcdvd_device
*pd
,
1992 unsigned *write_speed
)
1994 struct packet_command cgc
;
1995 struct request_sense sense
;
1996 unsigned char buf
[256+18];
1997 unsigned char *cap_buf
;
2000 cap_buf
= &buf
[sizeof(struct mode_page_header
) + pd
->mode_offset
];
2001 init_cdrom_command(&cgc
, buf
, sizeof(buf
), CGC_DATA_UNKNOWN
);
2004 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2006 cgc
.buflen
= pd
->mode_offset
+ cap_buf
[1] + 2 +
2007 sizeof(struct mode_page_header
);
2008 ret
= pkt_mode_sense(pd
, &cgc
, GPMODE_CAPABILITIES_PAGE
, 0);
2010 pkt_dump_sense(&cgc
);
2015 offset
= 20; /* Obsoleted field, used by older drives */
2016 if (cap_buf
[1] >= 28)
2017 offset
= 28; /* Current write speed selected */
2018 if (cap_buf
[1] >= 30) {
2019 /* If the drive reports at least one "Logical Unit Write
2020 * Speed Performance Descriptor Block", use the information
2021 * in the first block. (contains the highest speed)
2023 int num_spdb
= (cap_buf
[30] << 8) + cap_buf
[31];
2028 *write_speed
= (cap_buf
[offset
] << 8) | cap_buf
[offset
+ 1];
2032 /* These tables from cdrecord - I don't have orange book */
2033 /* standard speed CD-RW (1-4x) */
2034 static char clv_to_speed
[16] = {
2035 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2036 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2038 /* high speed CD-RW (-10x) */
2039 static char hs_clv_to_speed
[16] = {
2040 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2041 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2043 /* ultra high speed CD-RW */
2044 static char us_clv_to_speed
[16] = {
2045 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2046 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2050 * reads the maximum media speed from ATIP
2052 static noinline_for_stack
int pkt_media_speed(struct pktcdvd_device
*pd
,
2055 struct packet_command cgc
;
2056 struct request_sense sense
;
2057 unsigned char buf
[64];
2058 unsigned int size
, st
, sp
;
2061 init_cdrom_command(&cgc
, buf
, 2, CGC_DATA_READ
);
2063 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2065 cgc
.cmd
[2] = 4; /* READ ATIP */
2067 ret
= pkt_generic_packet(pd
, &cgc
);
2069 pkt_dump_sense(&cgc
);
2072 size
= ((unsigned int) buf
[0]<<8) + buf
[1] + 2;
2073 if (size
> sizeof(buf
))
2076 init_cdrom_command(&cgc
, buf
, size
, CGC_DATA_READ
);
2078 cgc
.cmd
[0] = GPCMD_READ_TOC_PMA_ATIP
;
2082 ret
= pkt_generic_packet(pd
, &cgc
);
2084 pkt_dump_sense(&cgc
);
2088 if (!(buf
[6] & 0x40)) {
2089 pkt_notice(pd
, "disc type is not CD-RW\n");
2092 if (!(buf
[6] & 0x4)) {
2093 pkt_notice(pd
, "A1 values on media are not valid, maybe not CDRW?\n");
2097 st
= (buf
[6] >> 3) & 0x7; /* disc sub-type */
2099 sp
= buf
[16] & 0xf; /* max speed from ATIP A1 field */
2101 /* Info from cdrecord */
2103 case 0: /* standard speed */
2104 *speed
= clv_to_speed
[sp
];
2106 case 1: /* high speed */
2107 *speed
= hs_clv_to_speed
[sp
];
2109 case 2: /* ultra high speed */
2110 *speed
= us_clv_to_speed
[sp
];
2113 pkt_notice(pd
, "unknown disc sub-type %d\n", st
);
2117 pkt_info(pd
, "maximum media speed: %d\n", *speed
);
2120 pkt_notice(pd
, "unknown speed %d for sub-type %d\n", sp
, st
);
2125 static noinline_for_stack
int pkt_perform_opc(struct pktcdvd_device
*pd
)
2127 struct packet_command cgc
;
2128 struct request_sense sense
;
2131 pkt_dbg(2, pd
, "Performing OPC\n");
2133 init_cdrom_command(&cgc
, NULL
, 0, CGC_DATA_NONE
);
2135 cgc
.timeout
= 60*HZ
;
2136 cgc
.cmd
[0] = GPCMD_SEND_OPC
;
2138 if ((ret
= pkt_generic_packet(pd
, &cgc
)))
2139 pkt_dump_sense(&cgc
);
2143 static int pkt_open_write(struct pktcdvd_device
*pd
)
2146 unsigned int write_speed
, media_write_speed
, read_speed
;
2148 if ((ret
= pkt_probe_settings(pd
))) {
2149 pkt_dbg(2, pd
, "failed probe\n");
2153 if ((ret
= pkt_set_write_settings(pd
))) {
2154 pkt_dbg(1, pd
, "failed saving write settings\n");
2158 pkt_write_caching(pd
, USE_WCACHING
);
2160 if ((ret
= pkt_get_max_speed(pd
, &write_speed
)))
2161 write_speed
= 16 * 177;
2162 switch (pd
->mmc3_profile
) {
2163 case 0x13: /* DVD-RW */
2164 case 0x1a: /* DVD+RW */
2165 case 0x12: /* DVD-RAM */
2166 pkt_dbg(1, pd
, "write speed %ukB/s\n", write_speed
);
2169 if ((ret
= pkt_media_speed(pd
, &media_write_speed
)))
2170 media_write_speed
= 16;
2171 write_speed
= min(write_speed
, media_write_speed
* 177);
2172 pkt_dbg(1, pd
, "write speed %ux\n", write_speed
/ 176);
2175 read_speed
= write_speed
;
2177 if ((ret
= pkt_set_speed(pd
, write_speed
, read_speed
))) {
2178 pkt_dbg(1, pd
, "couldn't set write speed\n");
2181 pd
->write_speed
= write_speed
;
2182 pd
->read_speed
= read_speed
;
2184 if ((ret
= pkt_perform_opc(pd
))) {
2185 pkt_dbg(1, pd
, "Optimum Power Calibration failed\n");
2192 * called at open time.
2194 static int pkt_open_dev(struct pktcdvd_device
*pd
, fmode_t write
)
2198 struct request_queue
*q
;
2201 * We need to re-open the cdrom device without O_NONBLOCK to be able
2202 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2203 * so bdget() can't fail.
2205 bdget(pd
->bdev
->bd_dev
);
2206 if ((ret
= blkdev_get(pd
->bdev
, FMODE_READ
| FMODE_EXCL
, pd
)))
2209 if ((ret
= pkt_get_last_written(pd
, &lba
))) {
2210 pkt_err(pd
, "pkt_get_last_written failed\n");
2214 set_capacity(pd
->disk
, lba
<< 2);
2215 set_capacity(pd
->bdev
->bd_disk
, lba
<< 2);
2216 bd_set_size(pd
->bdev
, (loff_t
)lba
<< 11);
2218 q
= bdev_get_queue(pd
->bdev
);
2220 if ((ret
= pkt_open_write(pd
)))
2223 * Some CDRW drives can not handle writes larger than one packet,
2224 * even if the size is a multiple of the packet size.
2226 spin_lock_irq(q
->queue_lock
);
2227 blk_queue_max_hw_sectors(q
, pd
->settings
.size
);
2228 spin_unlock_irq(q
->queue_lock
);
2229 set_bit(PACKET_WRITABLE
, &pd
->flags
);
2231 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2232 clear_bit(PACKET_WRITABLE
, &pd
->flags
);
2235 if ((ret
= pkt_set_segment_merging(pd
, q
)))
2239 if (!pkt_grow_pktlist(pd
, CONFIG_CDROM_PKTCDVD_BUFFERS
)) {
2240 pkt_err(pd
, "not enough memory for buffers\n");
2244 pkt_info(pd
, "%lukB available on disc\n", lba
<< 1);
2250 blkdev_put(pd
->bdev
, FMODE_READ
| FMODE_EXCL
);
2256 * called when the device is closed. makes sure that the device flushes
2257 * the internal cache before we close.
2259 static void pkt_release_dev(struct pktcdvd_device
*pd
, int flush
)
2261 if (flush
&& pkt_flush_cache(pd
))
2262 pkt_dbg(1, pd
, "not flushing cache\n");
2264 pkt_lock_door(pd
, 0);
2266 pkt_set_speed(pd
, MAX_SPEED
, MAX_SPEED
);
2267 blkdev_put(pd
->bdev
, FMODE_READ
| FMODE_EXCL
);
2269 pkt_shrink_pktlist(pd
);
2272 static struct pktcdvd_device
*pkt_find_dev_from_minor(unsigned int dev_minor
)
2274 if (dev_minor
>= MAX_WRITERS
)
2276 return pkt_devs
[dev_minor
];
2279 static int pkt_open(struct block_device
*bdev
, fmode_t mode
)
2281 struct pktcdvd_device
*pd
= NULL
;
2284 mutex_lock(&pktcdvd_mutex
);
2285 mutex_lock(&ctl_mutex
);
2286 pd
= pkt_find_dev_from_minor(MINOR(bdev
->bd_dev
));
2291 BUG_ON(pd
->refcnt
< 0);
2294 if (pd
->refcnt
> 1) {
2295 if ((mode
& FMODE_WRITE
) &&
2296 !test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2301 ret
= pkt_open_dev(pd
, mode
& FMODE_WRITE
);
2305 * needed here as well, since ext2 (among others) may change
2306 * the blocksize at mount time
2308 set_blocksize(bdev
, CD_FRAMESIZE
);
2311 mutex_unlock(&ctl_mutex
);
2312 mutex_unlock(&pktcdvd_mutex
);
2318 mutex_unlock(&ctl_mutex
);
2319 mutex_unlock(&pktcdvd_mutex
);
2323 static void pkt_close(struct gendisk
*disk
, fmode_t mode
)
2325 struct pktcdvd_device
*pd
= disk
->private_data
;
2327 mutex_lock(&pktcdvd_mutex
);
2328 mutex_lock(&ctl_mutex
);
2330 BUG_ON(pd
->refcnt
< 0);
2331 if (pd
->refcnt
== 0) {
2332 int flush
= test_bit(PACKET_WRITABLE
, &pd
->flags
);
2333 pkt_release_dev(pd
, flush
);
2335 mutex_unlock(&ctl_mutex
);
2336 mutex_unlock(&pktcdvd_mutex
);
2340 static void pkt_end_io_read_cloned(struct bio
*bio
, int err
)
2342 struct packet_stacked_data
*psd
= bio
->bi_private
;
2343 struct pktcdvd_device
*pd
= psd
->pd
;
2346 bio_endio(psd
->bio
, err
);
2347 mempool_free(psd
, psd_pool
);
2348 pkt_bio_finished(pd
);
2351 static void pkt_make_request(struct request_queue
*q
, struct bio
*bio
)
2353 struct pktcdvd_device
*pd
;
2354 char b
[BDEVNAME_SIZE
];
2356 struct packet_data
*pkt
;
2357 int was_empty
, blocked_bio
;
2358 struct pkt_rb_node
*node
;
2362 pkt_err(pd
, "%s incorrect request queue\n",
2363 bdevname(bio
->bi_bdev
, b
));
2368 * Clone READ bios so we can have our own bi_end_io callback.
2370 if (bio_data_dir(bio
) == READ
) {
2371 struct bio
*cloned_bio
= bio_clone(bio
, GFP_NOIO
);
2372 struct packet_stacked_data
*psd
= mempool_alloc(psd_pool
, GFP_NOIO
);
2376 cloned_bio
->bi_bdev
= pd
->bdev
;
2377 cloned_bio
->bi_private
= psd
;
2378 cloned_bio
->bi_end_io
= pkt_end_io_read_cloned
;
2379 pd
->stats
.secs_r
+= bio_sectors(bio
);
2380 pkt_queue_bio(pd
, cloned_bio
);
2384 if (!test_bit(PACKET_WRITABLE
, &pd
->flags
)) {
2385 pkt_notice(pd
, "WRITE for ro device (%llu)\n",
2386 (unsigned long long)bio
->bi_sector
);
2390 if (!bio
->bi_size
|| (bio
->bi_size
% CD_FRAMESIZE
)) {
2391 pkt_err(pd
, "wrong bio size\n");
2395 blk_queue_bounce(q
, &bio
);
2397 zone
= get_zone(bio
->bi_sector
, pd
);
2398 pkt_dbg(2, pd
, "start = %6llx stop = %6llx\n",
2399 (unsigned long long)bio
->bi_sector
,
2400 (unsigned long long)bio_end_sector(bio
));
2402 /* Check if we have to split the bio */
2404 struct bio_pair
*bp
;
2408 last_zone
= get_zone(bio_end_sector(bio
) - 1, pd
);
2409 if (last_zone
!= zone
) {
2410 BUG_ON(last_zone
!= zone
+ pd
->settings
.size
);
2411 first_sectors
= last_zone
- bio
->bi_sector
;
2412 bp
= bio_split(bio
, first_sectors
);
2414 pkt_make_request(q
, &bp
->bio1
);
2415 pkt_make_request(q
, &bp
->bio2
);
2416 bio_pair_release(bp
);
2422 * If we find a matching packet in state WAITING or READ_WAIT, we can
2423 * just append this bio to that packet.
2425 spin_lock(&pd
->cdrw
.active_list_lock
);
2427 list_for_each_entry(pkt
, &pd
->cdrw
.pkt_active_list
, list
) {
2428 if (pkt
->sector
== zone
) {
2429 spin_lock(&pkt
->lock
);
2430 if ((pkt
->state
== PACKET_WAITING_STATE
) ||
2431 (pkt
->state
== PACKET_READ_WAIT_STATE
)) {
2432 bio_list_add(&pkt
->orig_bios
, bio
);
2433 pkt
->write_size
+= bio
->bi_size
/ CD_FRAMESIZE
;
2434 if ((pkt
->write_size
>= pkt
->frames
) &&
2435 (pkt
->state
== PACKET_WAITING_STATE
)) {
2436 atomic_inc(&pkt
->run_sm
);
2437 wake_up(&pd
->wqueue
);
2439 spin_unlock(&pkt
->lock
);
2440 spin_unlock(&pd
->cdrw
.active_list_lock
);
2445 spin_unlock(&pkt
->lock
);
2448 spin_unlock(&pd
->cdrw
.active_list_lock
);
2451 * Test if there is enough room left in the bio work queue
2452 * (queue size >= congestion on mark).
2453 * If not, wait till the work queue size is below the congestion off mark.
2455 spin_lock(&pd
->lock
);
2456 if (pd
->write_congestion_on
> 0
2457 && pd
->bio_queue_size
>= pd
->write_congestion_on
) {
2458 set_bdi_congested(&q
->backing_dev_info
, BLK_RW_ASYNC
);
2460 spin_unlock(&pd
->lock
);
2461 congestion_wait(BLK_RW_ASYNC
, HZ
);
2462 spin_lock(&pd
->lock
);
2463 } while(pd
->bio_queue_size
> pd
->write_congestion_off
);
2465 spin_unlock(&pd
->lock
);
2468 * No matching packet found. Store the bio in the work queue.
2470 node
= mempool_alloc(pd
->rb_pool
, GFP_NOIO
);
2472 spin_lock(&pd
->lock
);
2473 BUG_ON(pd
->bio_queue_size
< 0);
2474 was_empty
= (pd
->bio_queue_size
== 0);
2475 pkt_rbtree_insert(pd
, node
);
2476 spin_unlock(&pd
->lock
);
2479 * Wake up the worker thread.
2481 atomic_set(&pd
->scan_queue
, 1);
2483 /* This wake_up is required for correct operation */
2484 wake_up(&pd
->wqueue
);
2485 } else if (!list_empty(&pd
->cdrw
.pkt_free_list
) && !blocked_bio
) {
2487 * This wake up is not required for correct operation,
2488 * but improves performance in some cases.
2490 wake_up(&pd
->wqueue
);
2499 static int pkt_merge_bvec(struct request_queue
*q
, struct bvec_merge_data
*bmd
,
2500 struct bio_vec
*bvec
)
2502 struct pktcdvd_device
*pd
= q
->queuedata
;
2503 sector_t zone
= get_zone(bmd
->bi_sector
, pd
);
2504 int used
= ((bmd
->bi_sector
- zone
) << 9) + bmd
->bi_size
;
2505 int remaining
= (pd
->settings
.size
<< 9) - used
;
2509 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2510 * boundary, pkt_make_request() will split the bio.
2512 remaining2
= PAGE_SIZE
- bmd
->bi_size
;
2513 remaining
= max(remaining
, remaining2
);
2515 BUG_ON(remaining
< 0);
2519 static void pkt_init_queue(struct pktcdvd_device
*pd
)
2521 struct request_queue
*q
= pd
->disk
->queue
;
2523 blk_queue_make_request(q
, pkt_make_request
);
2524 blk_queue_logical_block_size(q
, CD_FRAMESIZE
);
2525 blk_queue_max_hw_sectors(q
, PACKET_MAX_SECTORS
);
2526 blk_queue_merge_bvec(q
, pkt_merge_bvec
);
2530 static int pkt_seq_show(struct seq_file
*m
, void *p
)
2532 struct pktcdvd_device
*pd
= m
->private;
2534 char bdev_buf
[BDEVNAME_SIZE
];
2535 int states
[PACKET_NUM_STATES
];
2537 seq_printf(m
, "Writer %s mapped to %s:\n", pd
->name
,
2538 bdevname(pd
->bdev
, bdev_buf
));
2540 seq_printf(m
, "\nSettings:\n");
2541 seq_printf(m
, "\tpacket size:\t\t%dkB\n", pd
->settings
.size
/ 2);
2543 if (pd
->settings
.write_type
== 0)
2547 seq_printf(m
, "\twrite type:\t\t%s\n", msg
);
2549 seq_printf(m
, "\tpacket type:\t\t%s\n", pd
->settings
.fp
? "Fixed" : "Variable");
2550 seq_printf(m
, "\tlink loss:\t\t%d\n", pd
->settings
.link_loss
);
2552 seq_printf(m
, "\ttrack mode:\t\t%d\n", pd
->settings
.track_mode
);
2554 if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE1
)
2556 else if (pd
->settings
.block_mode
== PACKET_BLOCK_MODE2
)
2560 seq_printf(m
, "\tblock mode:\t\t%s\n", msg
);
2562 seq_printf(m
, "\nStatistics:\n");
2563 seq_printf(m
, "\tpackets started:\t%lu\n", pd
->stats
.pkt_started
);
2564 seq_printf(m
, "\tpackets ended:\t\t%lu\n", pd
->stats
.pkt_ended
);
2565 seq_printf(m
, "\twritten:\t\t%lukB\n", pd
->stats
.secs_w
>> 1);
2566 seq_printf(m
, "\tread gather:\t\t%lukB\n", pd
->stats
.secs_rg
>> 1);
2567 seq_printf(m
, "\tread:\t\t\t%lukB\n", pd
->stats
.secs_r
>> 1);
2569 seq_printf(m
, "\nMisc:\n");
2570 seq_printf(m
, "\treference count:\t%d\n", pd
->refcnt
);
2571 seq_printf(m
, "\tflags:\t\t\t0x%lx\n", pd
->flags
);
2572 seq_printf(m
, "\tread speed:\t\t%ukB/s\n", pd
->read_speed
);
2573 seq_printf(m
, "\twrite speed:\t\t%ukB/s\n", pd
->write_speed
);
2574 seq_printf(m
, "\tstart offset:\t\t%lu\n", pd
->offset
);
2575 seq_printf(m
, "\tmode page offset:\t%u\n", pd
->mode_offset
);
2577 seq_printf(m
, "\nQueue state:\n");
2578 seq_printf(m
, "\tbios queued:\t\t%d\n", pd
->bio_queue_size
);
2579 seq_printf(m
, "\tbios pending:\t\t%d\n", atomic_read(&pd
->cdrw
.pending_bios
));
2580 seq_printf(m
, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd
->current_sector
);
2582 pkt_count_states(pd
, states
);
2583 seq_printf(m
, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2584 states
[0], states
[1], states
[2], states
[3], states
[4], states
[5]);
2586 seq_printf(m
, "\twrite congestion marks:\toff=%d on=%d\n",
2587 pd
->write_congestion_off
,
2588 pd
->write_congestion_on
);
2592 static int pkt_seq_open(struct inode
*inode
, struct file
*file
)
2594 return single_open(file
, pkt_seq_show
, PDE_DATA(inode
));
2597 static const struct file_operations pkt_proc_fops
= {
2598 .open
= pkt_seq_open
,
2600 .llseek
= seq_lseek
,
2601 .release
= single_release
2604 static int pkt_new_dev(struct pktcdvd_device
*pd
, dev_t dev
)
2608 char b
[BDEVNAME_SIZE
];
2609 struct block_device
*bdev
;
2611 if (pd
->pkt_dev
== dev
) {
2612 pkt_err(pd
, "recursive setup not allowed\n");
2615 for (i
= 0; i
< MAX_WRITERS
; i
++) {
2616 struct pktcdvd_device
*pd2
= pkt_devs
[i
];
2619 if (pd2
->bdev
->bd_dev
== dev
) {
2620 pkt_err(pd
, "%s already setup\n",
2621 bdevname(pd2
->bdev
, b
));
2624 if (pd2
->pkt_dev
== dev
) {
2625 pkt_err(pd
, "can't chain pktcdvd devices\n");
2633 ret
= blkdev_get(bdev
, FMODE_READ
| FMODE_NDELAY
, NULL
);
2637 /* This is safe, since we have a reference from open(). */
2638 __module_get(THIS_MODULE
);
2641 set_blocksize(bdev
, CD_FRAMESIZE
);
2645 atomic_set(&pd
->cdrw
.pending_bios
, 0);
2646 pd
->cdrw
.thread
= kthread_run(kcdrwd
, pd
, "%s", pd
->name
);
2647 if (IS_ERR(pd
->cdrw
.thread
)) {
2648 pkt_err(pd
, "can't start kernel thread\n");
2653 proc_create_data(pd
->name
, 0, pkt_proc
, &pkt_proc_fops
, pd
);
2654 pkt_dbg(1, pd
, "writer mapped to %s\n", bdevname(bdev
, b
));
2658 blkdev_put(bdev
, FMODE_READ
| FMODE_NDELAY
);
2659 /* This is safe: open() is still holding a reference. */
2660 module_put(THIS_MODULE
);
2664 static int pkt_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned int cmd
, unsigned long arg
)
2666 struct pktcdvd_device
*pd
= bdev
->bd_disk
->private_data
;
2669 pkt_dbg(2, pd
, "cmd %x, dev %d:%d\n",
2670 cmd
, MAJOR(bdev
->bd_dev
), MINOR(bdev
->bd_dev
));
2672 mutex_lock(&pktcdvd_mutex
);
2676 * The door gets locked when the device is opened, so we
2677 * have to unlock it or else the eject command fails.
2679 if (pd
->refcnt
== 1)
2680 pkt_lock_door(pd
, 0);
2683 * forward selected CDROM ioctls to CD-ROM, for UDF
2685 case CDROMMULTISESSION
:
2686 case CDROMREADTOCENTRY
:
2687 case CDROM_LAST_WRITTEN
:
2688 case CDROM_SEND_PACKET
:
2689 case SCSI_IOCTL_SEND_COMMAND
:
2690 ret
= __blkdev_driver_ioctl(pd
->bdev
, mode
, cmd
, arg
);
2694 pkt_dbg(2, pd
, "Unknown ioctl (%x)\n", cmd
);
2697 mutex_unlock(&pktcdvd_mutex
);
2702 static unsigned int pkt_check_events(struct gendisk
*disk
,
2703 unsigned int clearing
)
2705 struct pktcdvd_device
*pd
= disk
->private_data
;
2706 struct gendisk
*attached_disk
;
2712 attached_disk
= pd
->bdev
->bd_disk
;
2713 if (!attached_disk
|| !attached_disk
->fops
->check_events
)
2715 return attached_disk
->fops
->check_events(attached_disk
, clearing
);
2718 static const struct block_device_operations pktcdvd_ops
= {
2719 .owner
= THIS_MODULE
,
2721 .release
= pkt_close
,
2723 .check_events
= pkt_check_events
,
2726 static char *pktcdvd_devnode(struct gendisk
*gd
, umode_t
*mode
)
2728 return kasprintf(GFP_KERNEL
, "pktcdvd/%s", gd
->disk_name
);
2732 * Set up mapping from pktcdvd device to CD-ROM device.
2734 static int pkt_setup_dev(dev_t dev
, dev_t
* pkt_dev
)
2738 struct pktcdvd_device
*pd
;
2739 struct gendisk
*disk
;
2741 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2743 for (idx
= 0; idx
< MAX_WRITERS
; idx
++)
2746 if (idx
== MAX_WRITERS
) {
2747 pr_err("max %d writers supported\n", MAX_WRITERS
);
2752 pd
= kzalloc(sizeof(struct pktcdvd_device
), GFP_KERNEL
);
2756 pd
->rb_pool
= mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE
,
2757 sizeof(struct pkt_rb_node
));
2761 INIT_LIST_HEAD(&pd
->cdrw
.pkt_free_list
);
2762 INIT_LIST_HEAD(&pd
->cdrw
.pkt_active_list
);
2763 spin_lock_init(&pd
->cdrw
.active_list_lock
);
2765 spin_lock_init(&pd
->lock
);
2766 spin_lock_init(&pd
->iosched
.lock
);
2767 bio_list_init(&pd
->iosched
.read_queue
);
2768 bio_list_init(&pd
->iosched
.write_queue
);
2769 sprintf(pd
->name
, DRIVER_NAME
"%d", idx
);
2770 init_waitqueue_head(&pd
->wqueue
);
2771 pd
->bio_queue
= RB_ROOT
;
2773 pd
->write_congestion_on
= write_congestion_on
;
2774 pd
->write_congestion_off
= write_congestion_off
;
2776 disk
= alloc_disk(1);
2780 disk
->major
= pktdev_major
;
2781 disk
->first_minor
= idx
;
2782 disk
->fops
= &pktcdvd_ops
;
2783 disk
->flags
= GENHD_FL_REMOVABLE
;
2784 strcpy(disk
->disk_name
, pd
->name
);
2785 disk
->devnode
= pktcdvd_devnode
;
2786 disk
->private_data
= pd
;
2787 disk
->queue
= blk_alloc_queue(GFP_KERNEL
);
2791 pd
->pkt_dev
= MKDEV(pktdev_major
, idx
);
2792 ret
= pkt_new_dev(pd
, dev
);
2796 /* inherit events of the host device */
2797 disk
->events
= pd
->bdev
->bd_disk
->events
;
2798 disk
->async_events
= pd
->bdev
->bd_disk
->async_events
;
2802 pkt_sysfs_dev_new(pd
);
2803 pkt_debugfs_dev_new(pd
);
2807 *pkt_dev
= pd
->pkt_dev
;
2809 mutex_unlock(&ctl_mutex
);
2813 blk_cleanup_queue(disk
->queue
);
2818 mempool_destroy(pd
->rb_pool
);
2821 mutex_unlock(&ctl_mutex
);
2822 pr_err("setup of pktcdvd device failed\n");
2827 * Tear down mapping from pktcdvd device to CD-ROM device.
2829 static int pkt_remove_dev(dev_t pkt_dev
)
2831 struct pktcdvd_device
*pd
;
2835 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2837 for (idx
= 0; idx
< MAX_WRITERS
; idx
++) {
2839 if (pd
&& (pd
->pkt_dev
== pkt_dev
))
2842 if (idx
== MAX_WRITERS
) {
2843 pkt_dbg(1, pd
, "dev not setup\n");
2848 if (pd
->refcnt
> 0) {
2852 if (!IS_ERR(pd
->cdrw
.thread
))
2853 kthread_stop(pd
->cdrw
.thread
);
2855 pkt_devs
[idx
] = NULL
;
2857 pkt_debugfs_dev_remove(pd
);
2858 pkt_sysfs_dev_remove(pd
);
2860 blkdev_put(pd
->bdev
, FMODE_READ
| FMODE_NDELAY
);
2862 remove_proc_entry(pd
->name
, pkt_proc
);
2863 pkt_dbg(1, pd
, "writer unmapped\n");
2865 del_gendisk(pd
->disk
);
2866 blk_cleanup_queue(pd
->disk
->queue
);
2869 mempool_destroy(pd
->rb_pool
);
2872 /* This is safe: open() is still holding a reference. */
2873 module_put(THIS_MODULE
);
2876 mutex_unlock(&ctl_mutex
);
2880 static void pkt_get_status(struct pkt_ctrl_command
*ctrl_cmd
)
2882 struct pktcdvd_device
*pd
;
2884 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2886 pd
= pkt_find_dev_from_minor(ctrl_cmd
->dev_index
);
2888 ctrl_cmd
->dev
= new_encode_dev(pd
->bdev
->bd_dev
);
2889 ctrl_cmd
->pkt_dev
= new_encode_dev(pd
->pkt_dev
);
2892 ctrl_cmd
->pkt_dev
= 0;
2894 ctrl_cmd
->num_devices
= MAX_WRITERS
;
2896 mutex_unlock(&ctl_mutex
);
2899 static long pkt_ctl_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2901 void __user
*argp
= (void __user
*)arg
;
2902 struct pkt_ctrl_command ctrl_cmd
;
2906 if (cmd
!= PACKET_CTRL_CMD
)
2909 if (copy_from_user(&ctrl_cmd
, argp
, sizeof(struct pkt_ctrl_command
)))
2912 switch (ctrl_cmd
.command
) {
2913 case PKT_CTRL_CMD_SETUP
:
2914 if (!capable(CAP_SYS_ADMIN
))
2916 ret
= pkt_setup_dev(new_decode_dev(ctrl_cmd
.dev
), &pkt_dev
);
2917 ctrl_cmd
.pkt_dev
= new_encode_dev(pkt_dev
);
2919 case PKT_CTRL_CMD_TEARDOWN
:
2920 if (!capable(CAP_SYS_ADMIN
))
2922 ret
= pkt_remove_dev(new_decode_dev(ctrl_cmd
.pkt_dev
));
2924 case PKT_CTRL_CMD_STATUS
:
2925 pkt_get_status(&ctrl_cmd
);
2931 if (copy_to_user(argp
, &ctrl_cmd
, sizeof(struct pkt_ctrl_command
)))
2936 #ifdef CONFIG_COMPAT
2937 static long pkt_ctl_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
2939 return pkt_ctl_ioctl(file
, cmd
, (unsigned long)compat_ptr(arg
));
2943 static const struct file_operations pkt_ctl_fops
= {
2944 .open
= nonseekable_open
,
2945 .unlocked_ioctl
= pkt_ctl_ioctl
,
2946 #ifdef CONFIG_COMPAT
2947 .compat_ioctl
= pkt_ctl_compat_ioctl
,
2949 .owner
= THIS_MODULE
,
2950 .llseek
= no_llseek
,
2953 static struct miscdevice pkt_misc
= {
2954 .minor
= MISC_DYNAMIC_MINOR
,
2955 .name
= DRIVER_NAME
,
2956 .nodename
= "pktcdvd/control",
2957 .fops
= &pkt_ctl_fops
2960 static int __init
pkt_init(void)
2964 mutex_init(&ctl_mutex
);
2966 psd_pool
= mempool_create_kmalloc_pool(PSD_POOL_SIZE
,
2967 sizeof(struct packet_stacked_data
));
2971 ret
= register_blkdev(pktdev_major
, DRIVER_NAME
);
2973 pr_err("unable to register block device\n");
2979 ret
= pkt_sysfs_init();
2985 ret
= misc_register(&pkt_misc
);
2987 pr_err("unable to register misc device\n");
2991 pkt_proc
= proc_mkdir("driver/"DRIVER_NAME
, NULL
);
2996 pkt_debugfs_cleanup();
2997 pkt_sysfs_cleanup();
2999 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3001 mempool_destroy(psd_pool
);
3005 static void __exit
pkt_exit(void)
3007 remove_proc_entry("driver/"DRIVER_NAME
, NULL
);
3008 misc_deregister(&pkt_misc
);
3010 pkt_debugfs_cleanup();
3011 pkt_sysfs_cleanup();
3013 unregister_blkdev(pktdev_major
, DRIVER_NAME
);
3014 mempool_destroy(psd_pool
);
3017 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3018 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3019 MODULE_LICENSE("GPL");
3021 module_init(pkt_init
);
3022 module_exit(pkt_exit
);