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Linux 2.6.21-rc3
[linux/fpc-iii.git] / drivers / block / pktcdvd.c
bloba4fb7038318817d02b6d39f83c5ccf8e004408dd
1 /*
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>
5 *
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
8 *
9 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
10 * DVD-RAM devices.
11 *
12 * Theory of operation:
13 *
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.
22 *
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.
26 *
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.
33 *
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.
38 *
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.
44 *
45 *************************************************************************/
46
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>
65
66 #include <asm/uaccess.h>
67
68 #define DRIVER_NAME "pktcdvd"
69
70 #if PACKET_DEBUG
71 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
72 #else
73 #define DPRINTK(fmt, args...)
74 #endif
75
76 #if PACKET_DEBUG > 1
77 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
78 #else
79 #define VPRINTK(fmt, args...)
80 #endif
81
82 #define MAX_SPEED 0xffff
83
84 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
85
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;
93
94 static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
95 static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */
96
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);
101
102
103
104 /*
105 * create and register a pktcdvd kernel object.
106 */
107 static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
108 const char* name,
109 struct kobject* parent,
110 struct kobj_type* ktype)
111 {
112 struct pktcdvd_kobj *p;
113 p = kzalloc(sizeof(*p), GFP_KERNEL);
114 if (!p)
115 return NULL;
116 kobject_set_name(&p->kobj, "%s", name);
117 p->kobj.parent = parent;
118 p->kobj.ktype = ktype;
119 p->pd = pd;
120 if (kobject_register(&p->kobj) != 0)
121 return NULL;
122 return p;
123 }
124 /*
125 * remove a pktcdvd kernel object.
126 */
127 static void pkt_kobj_remove(struct pktcdvd_kobj *p)
128 {
129 if (p)
130 kobject_unregister(&p->kobj);
131 }
132 /*
133 * default release function for pktcdvd kernel objects.
134 */
135 static void pkt_kobj_release(struct kobject *kobj)
136 {
137 kfree(to_pktcdvdkobj(kobj));
138 }
139
140
141 /**********************************************************
142 *
143 * sysfs interface for pktcdvd
144 * by (C) 2006 Thomas Maier <balagi@justmail.de>
145 *
146 **********************************************************/
147
148 #define DEF_ATTR(_obj,_name,_mode) \
149 static struct attribute _obj = { \
150 .name = _name, .owner = THIS_MODULE, .mode = _mode }
151
152 /**********************************************************
153 /sys/class/pktcdvd/pktcdvd[0-7]/
154 stat/reset
155 stat/packets_started
156 stat/packets_finished
157 stat/kb_written
158 stat/kb_read
159 stat/kb_read_gather
160 write_queue/size
161 write_queue/congestion_off
162 write_queue/congestion_on
163 **********************************************************/
164
165 DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
166 DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
167 DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
168 DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
169 DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
170 DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
171
172 static struct attribute *kobj_pkt_attrs_stat[] = {
173 &kobj_pkt_attr_st1,
174 &kobj_pkt_attr_st2,
175 &kobj_pkt_attr_st3,
176 &kobj_pkt_attr_st4,
177 &kobj_pkt_attr_st5,
178 &kobj_pkt_attr_st6,
179 NULL
180 };
181
182 DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
183 DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
184 DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
185
186 static struct attribute *kobj_pkt_attrs_wqueue[] = {
187 &kobj_pkt_attr_wq1,
188 &kobj_pkt_attr_wq2,
189 &kobj_pkt_attr_wq3,
190 NULL
191 };
192
193 static ssize_t kobj_pkt_show(struct kobject *kobj,
194 struct attribute *attr, char *data)
195 {
196 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
197 int n = 0;
198 int v;
199 if (strcmp(attr->name, "packets_started") == 0) {
200 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
201
202 } else if (strcmp(attr->name, "packets_finished") == 0) {
203 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
204
205 } else if (strcmp(attr->name, "kb_written") == 0) {
206 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
207
208 } else if (strcmp(attr->name, "kb_read") == 0) {
209 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
210
211 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
212 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
213
214 } else if (strcmp(attr->name, "size") == 0) {
215 spin_lock(&pd->lock);
216 v = pd->bio_queue_size;
217 spin_unlock(&pd->lock);
218 n = sprintf(data, "%d\n", v);
219
220 } else if (strcmp(attr->name, "congestion_off") == 0) {
221 spin_lock(&pd->lock);
222 v = pd->write_congestion_off;
223 spin_unlock(&pd->lock);
224 n = sprintf(data, "%d\n", v);
225
226 } else if (strcmp(attr->name, "congestion_on") == 0) {
227 spin_lock(&pd->lock);
228 v = pd->write_congestion_on;
229 spin_unlock(&pd->lock);
230 n = sprintf(data, "%d\n", v);
231 }
232 return n;
233 }
234
235 static void init_write_congestion_marks(int* lo, int* hi)
236 {
237 if (*hi > 0) {
238 *hi = max(*hi, 500);
239 *hi = min(*hi, 1000000);
240 if (*lo <= 0)
241 *lo = *hi - 100;
242 else {
243 *lo = min(*lo, *hi - 100);
244 *lo = max(*lo, 100);
245 }
246 } else {
247 *hi = -1;
248 *lo = -1;
249 }
250 }
251
252 static ssize_t kobj_pkt_store(struct kobject *kobj,
253 struct attribute *attr,
254 const char *data, size_t len)
255 {
256 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
257 int val;
258
259 if (strcmp(attr->name, "reset") == 0 && len > 0) {
260 pd->stats.pkt_started = 0;
261 pd->stats.pkt_ended = 0;
262 pd->stats.secs_w = 0;
263 pd->stats.secs_rg = 0;
264 pd->stats.secs_r = 0;
265
266 } else if (strcmp(attr->name, "congestion_off") == 0
267 && sscanf(data, "%d", &val) == 1) {
268 spin_lock(&pd->lock);
269 pd->write_congestion_off = val;
270 init_write_congestion_marks(&pd->write_congestion_off,
271 &pd->write_congestion_on);
272 spin_unlock(&pd->lock);
273
274 } else if (strcmp(attr->name, "congestion_on") == 0
275 && sscanf(data, "%d", &val) == 1) {
276 spin_lock(&pd->lock);
277 pd->write_congestion_on = val;
278 init_write_congestion_marks(&pd->write_congestion_off,
279 &pd->write_congestion_on);
280 spin_unlock(&pd->lock);
281 }
282 return len;
283 }
284
285 static struct sysfs_ops kobj_pkt_ops = {
286 .show = kobj_pkt_show,
287 .store = kobj_pkt_store
288 };
289 static struct kobj_type kobj_pkt_type_stat = {
290 .release = pkt_kobj_release,
291 .sysfs_ops = &kobj_pkt_ops,
292 .default_attrs = kobj_pkt_attrs_stat
293 };
294 static struct kobj_type kobj_pkt_type_wqueue = {
295 .release = pkt_kobj_release,
296 .sysfs_ops = &kobj_pkt_ops,
297 .default_attrs = kobj_pkt_attrs_wqueue
298 };
299
300 static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
301 {
302 if (class_pktcdvd) {
303 pd->clsdev = class_device_create(class_pktcdvd,
304 NULL, pd->pkt_dev,
305 NULL, "%s", pd->name);
306 if (IS_ERR(pd->clsdev))
307 pd->clsdev = NULL;
308 }
309 if (pd->clsdev) {
310 pd->kobj_stat = pkt_kobj_create(pd, "stat",
311 &pd->clsdev->kobj,
312 &kobj_pkt_type_stat);
313 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
314 &pd->clsdev->kobj,
315 &kobj_pkt_type_wqueue);
316 }
317 }
318
319 static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
320 {
321 pkt_kobj_remove(pd->kobj_stat);
322 pkt_kobj_remove(pd->kobj_wqueue);
323 if (class_pktcdvd)
324 class_device_destroy(class_pktcdvd, pd->pkt_dev);
325 }
326
327
328 /********************************************************************
329 /sys/class/pktcdvd/
330 add map block device
331 remove unmap packet dev
332 device_map show mappings
333 *******************************************************************/
334
335 static void class_pktcdvd_release(struct class *cls)
336 {
337 kfree(cls);
338 }
339 static ssize_t class_pktcdvd_show_map(struct class *c, char *data)
340 {
341 int n = 0;
342 int idx;
343 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
344 for (idx = 0; idx < MAX_WRITERS; idx++) {
345 struct pktcdvd_device *pd = pkt_devs[idx];
346 if (!pd)
347 continue;
348 n += sprintf(data+n, "%s %u:%u %u:%u\n",
349 pd->name,
350 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
351 MAJOR(pd->bdev->bd_dev),
352 MINOR(pd->bdev->bd_dev));
353 }
354 mutex_unlock(&ctl_mutex);
355 return n;
356 }
357
358 static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf,
359 size_t count)
360 {
361 unsigned int major, minor;
362 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
363 pkt_setup_dev(MKDEV(major, minor), NULL);
364 return count;
365 }
366 return -EINVAL;
367 }
368
369 static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf,
370 size_t count)
371 {
372 unsigned int major, minor;
373 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
374 pkt_remove_dev(MKDEV(major, minor));
375 return count;
376 }
377 return -EINVAL;
378 }
379
380 static struct class_attribute class_pktcdvd_attrs[] = {
381 __ATTR(add, 0200, NULL, class_pktcdvd_store_add),
382 __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove),
383 __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL),
384 __ATTR_NULL
385 };
386
387
388 static int pkt_sysfs_init(void)
389 {
390 int ret = 0;
391
392 /*
393 * create control files in sysfs
394 * /sys/class/pktcdvd/...
395 */
396 class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
397 if (!class_pktcdvd)
398 return -ENOMEM;
399 class_pktcdvd->name = DRIVER_NAME;
400 class_pktcdvd->owner = THIS_MODULE;
401 class_pktcdvd->class_release = class_pktcdvd_release;
402 class_pktcdvd->class_attrs = class_pktcdvd_attrs;
403 ret = class_register(class_pktcdvd);
404 if (ret) {
405 kfree(class_pktcdvd);
406 class_pktcdvd = NULL;
407 printk(DRIVER_NAME": failed to create class pktcdvd\n");
408 return ret;
409 }
410 return 0;
411 }
412
413 static void pkt_sysfs_cleanup(void)
414 {
415 if (class_pktcdvd)
416 class_destroy(class_pktcdvd);
417 class_pktcdvd = NULL;
418 }
419
420 /********************************************************************
421 entries in debugfs
422
423 /debugfs/pktcdvd[0-7]/
424 info
425
426 *******************************************************************/
427
428 static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
429 {
430 return pkt_seq_show(m, p);
431 }
432
433 static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
434 {
435 return single_open(file, pkt_debugfs_seq_show, inode->i_private);
436 }
437
438 static const struct file_operations debug_fops = {
439 .open = pkt_debugfs_fops_open,
440 .read = seq_read,
441 .llseek = seq_lseek,
442 .release = single_release,
443 .owner = THIS_MODULE,
444 };
445
446 static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
447 {
448 if (!pkt_debugfs_root)
449 return;
450 pd->dfs_f_info = NULL;
451 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
452 if (IS_ERR(pd->dfs_d_root)) {
453 pd->dfs_d_root = NULL;
454 return;
455 }
456 pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
457 pd->dfs_d_root, pd, &debug_fops);
458 if (IS_ERR(pd->dfs_f_info)) {
459 pd->dfs_f_info = NULL;
460 return;
461 }
462 }
463
464 static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
465 {
466 if (!pkt_debugfs_root)
467 return;
468 if (pd->dfs_f_info)
469 debugfs_remove(pd->dfs_f_info);
470 pd->dfs_f_info = NULL;
471 if (pd->dfs_d_root)
472 debugfs_remove(pd->dfs_d_root);
473 pd->dfs_d_root = NULL;
474 }
475
476 static void pkt_debugfs_init(void)
477 {
478 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
479 if (IS_ERR(pkt_debugfs_root)) {
480 pkt_debugfs_root = NULL;
481 return;
482 }
483 }
484
485 static void pkt_debugfs_cleanup(void)
486 {
487 if (!pkt_debugfs_root)
488 return;
489 debugfs_remove(pkt_debugfs_root);
490 pkt_debugfs_root = NULL;
491 }
492
493 /* ----------------------------------------------------------*/
494
495
496 static void pkt_bio_finished(struct pktcdvd_device *pd)
497 {
498 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
499 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
500 VPRINTK(DRIVER_NAME": queue empty\n");
501 atomic_set(&pd->iosched.attention, 1);
502 wake_up(&pd->wqueue);
503 }
504 }
505
506 static void pkt_bio_destructor(struct bio *bio)
507 {
508 kfree(bio->bi_io_vec);
509 kfree(bio);
510 }
511
512 static struct bio *pkt_bio_alloc(int nr_iovecs)
513 {
514 struct bio_vec *bvl = NULL;
515 struct bio *bio;
516
517 bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
518 if (!bio)
519 goto no_bio;
520 bio_init(bio);
521
522 bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
523 if (!bvl)
524 goto no_bvl;
525
526 bio->bi_max_vecs = nr_iovecs;
527 bio->bi_io_vec = bvl;
528 bio->bi_destructor = pkt_bio_destructor;
529
530 return bio;
531
532 no_bvl:
533 kfree(bio);
534 no_bio:
535 return NULL;
536 }
537
538 /*
539 * Allocate a packet_data struct
540 */
541 static struct packet_data *pkt_alloc_packet_data(int frames)
542 {
543 int i;
544 struct packet_data *pkt;
545
546 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
547 if (!pkt)
548 goto no_pkt;
549
550 pkt->frames = frames;
551 pkt->w_bio = pkt_bio_alloc(frames);
552 if (!pkt->w_bio)
553 goto no_bio;
554
555 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
556 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
557 if (!pkt->pages[i])
558 goto no_page;
559 }
560
561 spin_lock_init(&pkt->lock);
562
563 for (i = 0; i < frames; i++) {
564 struct bio *bio = pkt_bio_alloc(1);
565 if (!bio)
566 goto no_rd_bio;
567 pkt->r_bios[i] = bio;
568 }
569
570 return pkt;
571
572 no_rd_bio:
573 for (i = 0; i < frames; i++) {
574 struct bio *bio = pkt->r_bios[i];
575 if (bio)
576 bio_put(bio);
577 }
578
579 no_page:
580 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
581 if (pkt->pages[i])
582 __free_page(pkt->pages[i]);
583 bio_put(pkt->w_bio);
584 no_bio:
585 kfree(pkt);
586 no_pkt:
587 return NULL;
588 }
589
590 /*
591 * Free a packet_data struct
592 */
593 static void pkt_free_packet_data(struct packet_data *pkt)
594 {
595 int i;
596
597 for (i = 0; i < pkt->frames; i++) {
598 struct bio *bio = pkt->r_bios[i];
599 if (bio)
600 bio_put(bio);
601 }
602 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
603 __free_page(pkt->pages[i]);
604 bio_put(pkt->w_bio);
605 kfree(pkt);
606 }
607
608 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
609 {
610 struct packet_data *pkt, *next;
611
612 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
613
614 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
615 pkt_free_packet_data(pkt);
616 }
617 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
618 }
619
620 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
621 {
622 struct packet_data *pkt;
623
624 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
625
626 while (nr_packets > 0) {
627 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
628 if (!pkt) {
629 pkt_shrink_pktlist(pd);
630 return 0;
631 }
632 pkt->id = nr_packets;
633 pkt->pd = pd;
634 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
635 nr_packets--;
636 }
637 return 1;
638 }
639
640 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
641 {
642 struct rb_node *n = rb_next(&node->rb_node);
643 if (!n)
644 return NULL;
645 return rb_entry(n, struct pkt_rb_node, rb_node);
646 }
647
648 static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
649 {
650 rb_erase(&node->rb_node, &pd->bio_queue);
651 mempool_free(node, pd->rb_pool);
652 pd->bio_queue_size--;
653 BUG_ON(pd->bio_queue_size < 0);
654 }
655
656 /*
657 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
658 */
659 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
660 {
661 struct rb_node *n = pd->bio_queue.rb_node;
662 struct rb_node *next;
663 struct pkt_rb_node *tmp;
664
665 if (!n) {
666 BUG_ON(pd->bio_queue_size > 0);
667 return NULL;
668 }
669
670 for (;;) {
671 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
672 if (s <= tmp->bio->bi_sector)
673 next = n->rb_left;
674 else
675 next = n->rb_right;
676 if (!next)
677 break;
678 n = next;
679 }
680
681 if (s > tmp->bio->bi_sector) {
682 tmp = pkt_rbtree_next(tmp);
683 if (!tmp)
684 return NULL;
685 }
686 BUG_ON(s > tmp->bio->bi_sector);
687 return tmp;
688 }
689
690 /*
691 * Insert a node into the pd->bio_queue rb tree.
692 */
693 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
694 {
695 struct rb_node **p = &pd->bio_queue.rb_node;
696 struct rb_node *parent = NULL;
697 sector_t s = node->bio->bi_sector;
698 struct pkt_rb_node *tmp;
699
700 while (*p) {
701 parent = *p;
702 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
703 if (s < tmp->bio->bi_sector)
704 p = &(*p)->rb_left;
705 else
706 p = &(*p)->rb_right;
707 }
708 rb_link_node(&node->rb_node, parent, p);
709 rb_insert_color(&node->rb_node, &pd->bio_queue);
710 pd->bio_queue_size++;
711 }
712
713 /*
714 * Add a bio to a single linked list defined by its head and tail pointers.
715 */
716 static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
717 {
718 bio->bi_next = NULL;
719 if (*list_tail) {
720 BUG_ON((*list_head) == NULL);
721 (*list_tail)->bi_next = bio;
722 (*list_tail) = bio;
723 } else {
724 BUG_ON((*list_head) != NULL);
725 (*list_head) = bio;
726 (*list_tail) = bio;
727 }
728 }
729
730 /*
731 * Remove and return the first bio from a single linked list defined by its
732 * head and tail pointers.
733 */
734 static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
735 {
736 struct bio *bio;
737
738 if (*list_head == NULL)
739 return NULL;
740
741 bio = *list_head;
742 *list_head = bio->bi_next;
743 if (*list_head == NULL)
744 *list_tail = NULL;
745
746 bio->bi_next = NULL;
747 return bio;
748 }
749
750 /*
751 * Send a packet_command to the underlying block device and
752 * wait for completion.
753 */
754 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
755 {
756 request_queue_t *q = bdev_get_queue(pd->bdev);
757 struct request *rq;
758 int ret = 0;
759
760 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
761 WRITE : READ, __GFP_WAIT);
762
763 if (cgc->buflen) {
764 if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
765 goto out;
766 }
767
768 rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
769 memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
770 if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
771 memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
772
773 rq->timeout = 60*HZ;
774 rq->cmd_type = REQ_TYPE_BLOCK_PC;
775 rq->cmd_flags |= REQ_HARDBARRIER;
776 if (cgc->quiet)
777 rq->cmd_flags |= REQ_QUIET;
778
779 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
780 ret = rq->errors;
781 out:
782 blk_put_request(rq);
783 return ret;
784 }
785
786 /*
787 * A generic sense dump / resolve mechanism should be implemented across
788 * all ATAPI + SCSI devices.
789 */
790 static void pkt_dump_sense(struct packet_command *cgc)
791 {
792 static char *info[9] = { "No sense", "Recovered error", "Not ready",
793 "Medium error", "Hardware error", "Illegal request",
794 "Unit attention", "Data protect", "Blank check" };
795 int i;
796 struct request_sense *sense = cgc->sense;
797
798 printk(DRIVER_NAME":");
799 for (i = 0; i < CDROM_PACKET_SIZE; i++)
800 printk(" %02x", cgc->cmd[i]);
801 printk(" - ");
802
803 if (sense == NULL) {
804 printk("no sense\n");
805 return;
806 }
807
808 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
809
810 if (sense->sense_key > 8) {
811 printk(" (INVALID)\n");
812 return;
813 }
814
815 printk(" (%s)\n", info[sense->sense_key]);
816 }
817
818 /*
819 * flush the drive cache to media
820 */
821 static int pkt_flush_cache(struct pktcdvd_device *pd)
822 {
823 struct packet_command cgc;
824
825 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
826 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
827 cgc.quiet = 1;
828
829 /*
830 * the IMMED bit -- we default to not setting it, although that
831 * would allow a much faster close, this is safer
832 */
833 #if 0
834 cgc.cmd[1] = 1 << 1;
835 #endif
836 return pkt_generic_packet(pd, &cgc);
837 }
838
839 /*
840 * speed is given as the normal factor, e.g. 4 for 4x
841 */
842 static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed)
843 {
844 struct packet_command cgc;
845 struct request_sense sense;
846 int ret;
847
848 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
849 cgc.sense = &sense;
850 cgc.cmd[0] = GPCMD_SET_SPEED;
851 cgc.cmd[2] = (read_speed >> 8) & 0xff;
852 cgc.cmd[3] = read_speed & 0xff;
853 cgc.cmd[4] = (write_speed >> 8) & 0xff;
854 cgc.cmd[5] = write_speed & 0xff;
855
856 if ((ret = pkt_generic_packet(pd, &cgc)))
857 pkt_dump_sense(&cgc);
858
859 return ret;
860 }
861
862 /*
863 * Queue a bio for processing by the low-level CD device. Must be called
864 * from process context.
865 */
866 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
867 {
868 spin_lock(&pd->iosched.lock);
869 if (bio_data_dir(bio) == READ) {
870 pkt_add_list_last(bio, &pd->iosched.read_queue,
871 &pd->iosched.read_queue_tail);
872 } else {
873 pkt_add_list_last(bio, &pd->iosched.write_queue,
874 &pd->iosched.write_queue_tail);
875 }
876 spin_unlock(&pd->iosched.lock);
877
878 atomic_set(&pd->iosched.attention, 1);
879 wake_up(&pd->wqueue);
880 }
881
882 /*
883 * Process the queued read/write requests. This function handles special
884 * requirements for CDRW drives:
885 * - A cache flush command must be inserted before a read request if the
886 * previous request was a write.
887 * - Switching between reading and writing is slow, so don't do it more often
888 * than necessary.
889 * - Optimize for throughput at the expense of latency. This means that streaming
890 * writes will never be interrupted by a read, but if the drive has to seek
891 * before the next write, switch to reading instead if there are any pending
892 * read requests.
893 * - Set the read speed according to current usage pattern. When only reading
894 * from the device, it's best to use the highest possible read speed, but
895 * when switching often between reading and writing, it's better to have the
896 * same read and write speeds.
897 */
898 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
899 {
900
901 if (atomic_read(&pd->iosched.attention) == 0)
902 return;
903 atomic_set(&pd->iosched.attention, 0);
904
905 for (;;) {
906 struct bio *bio;
907 int reads_queued, writes_queued;
908
909 spin_lock(&pd->iosched.lock);
910 reads_queued = (pd->iosched.read_queue != NULL);
911 writes_queued = (pd->iosched.write_queue != NULL);
912 spin_unlock(&pd->iosched.lock);
913
914 if (!reads_queued && !writes_queued)
915 break;
916
917 if (pd->iosched.writing) {
918 int need_write_seek = 1;
919 spin_lock(&pd->iosched.lock);
920 bio = pd->iosched.write_queue;
921 spin_unlock(&pd->iosched.lock);
922 if (bio && (bio->bi_sector == pd->iosched.last_write))
923 need_write_seek = 0;
924 if (need_write_seek && reads_queued) {
925 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
926 VPRINTK(DRIVER_NAME": write, waiting\n");
927 break;
928 }
929 pkt_flush_cache(pd);
930 pd->iosched.writing = 0;
931 }
932 } else {
933 if (!reads_queued && writes_queued) {
934 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
935 VPRINTK(DRIVER_NAME": read, waiting\n");
936 break;
937 }
938 pd->iosched.writing = 1;
939 }
940 }
941
942 spin_lock(&pd->iosched.lock);
943 if (pd->iosched.writing) {
944 bio = pkt_get_list_first(&pd->iosched.write_queue,
945 &pd->iosched.write_queue_tail);
946 } else {
947 bio = pkt_get_list_first(&pd->iosched.read_queue,
948 &pd->iosched.read_queue_tail);
949 }
950 spin_unlock(&pd->iosched.lock);
951
952 if (!bio)
953 continue;
954
955 if (bio_data_dir(bio) == READ)
956 pd->iosched.successive_reads += bio->bi_size >> 10;
957 else {
958 pd->iosched.successive_reads = 0;
959 pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
960 }
961 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
962 if (pd->read_speed == pd->write_speed) {
963 pd->read_speed = MAX_SPEED;
964 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
965 }
966 } else {
967 if (pd->read_speed != pd->write_speed) {
968 pd->read_speed = pd->write_speed;
969 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
970 }
971 }
972
973 atomic_inc(&pd->cdrw.pending_bios);
974 generic_make_request(bio);
975 }
976 }
977
978 /*
979 * Special care is needed if the underlying block device has a small
980 * max_phys_segments value.
981 */
982 static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q)
983 {
984 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
985 /*
986 * The cdrom device can handle one segment/frame
987 */
988 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
989 return 0;
990 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
991 /*
992 * We can handle this case at the expense of some extra memory
993 * copies during write operations
994 */
995 set_bit(PACKET_MERGE_SEGS, &pd->flags);
996 return 0;
997 } else {
998 printk(DRIVER_NAME": cdrom max_phys_segments too small\n");
999 return -EIO;
1000 }
1001 }
1002
1003 /*
1004 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
1005 */
1006 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
1007 {
1008 unsigned int copy_size = CD_FRAMESIZE;
1009
1010 while (copy_size > 0) {
1011 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
1012 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
1013 src_bvl->bv_offset + offs;
1014 void *vto = page_address(dst_page) + dst_offs;
1015 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
1016
1017 BUG_ON(len < 0);
1018 memcpy(vto, vfrom, len);
1019 kunmap_atomic(vfrom, KM_USER0);
1020
1021 seg++;
1022 offs = 0;
1023 dst_offs += len;
1024 copy_size -= len;
1025 }
1026 }
1027
1028 /*
1029 * Copy all data for this packet to pkt->pages[], so that
1030 * a) The number of required segments for the write bio is minimized, which
1031 * is necessary for some scsi controllers.
1032 * b) The data can be used as cache to avoid read requests if we receive a
1033 * new write request for the same zone.
1034 */
1035 static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
1036 {
1037 int f, p, offs;
1038
1039 /* Copy all data to pkt->pages[] */
1040 p = 0;
1041 offs = 0;
1042 for (f = 0; f < pkt->frames; f++) {
1043 if (bvec[f].bv_page != pkt->pages[p]) {
1044 void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset;
1045 void *vto = page_address(pkt->pages[p]) + offs;
1046 memcpy(vto, vfrom, CD_FRAMESIZE);
1047 kunmap_atomic(vfrom, KM_USER0);
1048 bvec[f].bv_page = pkt->pages[p];
1049 bvec[f].bv_offset = offs;
1050 } else {
1051 BUG_ON(bvec[f].bv_offset != offs);
1052 }
1053 offs += CD_FRAMESIZE;
1054 if (offs >= PAGE_SIZE) {
1055 offs = 0;
1056 p++;
1057 }
1058 }
1059 }
1060
1061 static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
1062 {
1063 struct packet_data *pkt = bio->bi_private;
1064 struct pktcdvd_device *pd = pkt->pd;
1065 BUG_ON(!pd);
1066
1067 if (bio->bi_size)
1068 return 1;
1069
1070 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
1071 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
1072
1073 if (err)
1074 atomic_inc(&pkt->io_errors);
1075 if (atomic_dec_and_test(&pkt->io_wait)) {
1076 atomic_inc(&pkt->run_sm);
1077 wake_up(&pd->wqueue);
1078 }
1079 pkt_bio_finished(pd);
1080
1081 return 0;
1082 }
1083
1084 static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err)
1085 {
1086 struct packet_data *pkt = bio->bi_private;
1087 struct pktcdvd_device *pd = pkt->pd;
1088 BUG_ON(!pd);
1089
1090 if (bio->bi_size)
1091 return 1;
1092
1093 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
1094
1095 pd->stats.pkt_ended++;
1096
1097 pkt_bio_finished(pd);
1098 atomic_dec(&pkt->io_wait);
1099 atomic_inc(&pkt->run_sm);
1100 wake_up(&pd->wqueue);
1101 return 0;
1102 }
1103
1104 /*
1105 * Schedule reads for the holes in a packet
1106 */
1107 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1108 {
1109 int frames_read = 0;
1110 struct bio *bio;
1111 int f;
1112 char written[PACKET_MAX_SIZE];
1113
1114 BUG_ON(!pkt->orig_bios);
1115
1116 atomic_set(&pkt->io_wait, 0);
1117 atomic_set(&pkt->io_errors, 0);
1118
1119 /*
1120 * Figure out which frames we need to read before we can write.
1121 */
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++)
1131 written[f] = 1;
1132 }
1133 spin_unlock(&pkt->lock);
1134
1135 if (pkt->cache_valid) {
1136 VPRINTK("pkt_gather_data: zone %llx cached\n",
1137 (unsigned long long)pkt->sector);
1138 goto out_account;
1139 }
1140
1141 /*
1142 * Schedule reads for missing parts of the packet.
1143 */
1144 for (f = 0; f < pkt->frames; f++) {
1145 int p, offset;
1146 if (written[f])
1147 continue;
1148 bio = pkt->r_bios[f];
1149 bio_init(bio);
1150 bio->bi_max_vecs = 1;
1151 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1152 bio->bi_bdev = pd->bdev;
1153 bio->bi_end_io = pkt_end_io_read;
1154 bio->bi_private = pkt;
1155
1156 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1157 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1158 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1159 f, pkt->pages[p], offset);
1160 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1161 BUG();
1162
1163 atomic_inc(&pkt->io_wait);
1164 bio->bi_rw = READ;
1165 pkt_queue_bio(pd, bio);
1166 frames_read++;
1167 }
1168
1169 out_account:
1170 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1171 frames_read, (unsigned long long)pkt->sector);
1172 pd->stats.pkt_started++;
1173 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
1174 }
1175
1176 /*
1177 * Find a packet matching zone, or the least recently used packet if
1178 * there is no match.
1179 */
1180 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1181 {
1182 struct packet_data *pkt;
1183
1184 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1185 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1186 list_del_init(&pkt->list);
1187 if (pkt->sector != zone)
1188 pkt->cache_valid = 0;
1189 return pkt;
1190 }
1191 }
1192 BUG();
1193 return NULL;
1194 }
1195
1196 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1197 {
1198 if (pkt->cache_valid) {
1199 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1200 } else {
1201 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1202 }
1203 }
1204
1205 /*
1206 * recover a failed write, query for relocation if possible
1207 *
1208 * returns 1 if recovery is possible, or 0 if not
1209 *
1210 */
1211 static int pkt_start_recovery(struct packet_data *pkt)
1212 {
1213 /*
1214 * FIXME. We need help from the file system to implement
1215 * recovery handling.
1216 */
1217 return 0;
1218 #if 0
1219 struct request *rq = pkt->rq;
1220 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1221 struct block_device *pkt_bdev;
1222 struct super_block *sb = NULL;
1223 unsigned long old_block, new_block;
1224 sector_t new_sector;
1225
1226 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1227 if (pkt_bdev) {
1228 sb = get_super(pkt_bdev);
1229 bdput(pkt_bdev);
1230 }
1231
1232 if (!sb)
1233 return 0;
1234
1235 if (!sb->s_op || !sb->s_op->relocate_blocks)
1236 goto out;
1237
1238 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1239 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1240 goto out;
1241
1242 new_sector = new_block * (CD_FRAMESIZE >> 9);
1243 pkt->sector = new_sector;
1244
1245 pkt->bio->bi_sector = new_sector;
1246 pkt->bio->bi_next = NULL;
1247 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
1248 pkt->bio->bi_idx = 0;
1249
1250 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
1251 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
1252 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
1253 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
1254 BUG_ON(pkt->bio->bi_private != pkt);
1255
1256 drop_super(sb);
1257 return 1;
1258
1259 out:
1260 drop_super(sb);
1261 return 0;
1262 #endif
1263 }
1264
1265 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1266 {
1267 #if PACKET_DEBUG > 1
1268 static const char *state_name[] = {
1269 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1270 };
1271 enum packet_data_state old_state = pkt->state;
1272 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
1273 state_name[old_state], state_name[state]);
1274 #endif
1275 pkt->state = state;
1276 }
1277
1278 /*
1279 * Scan the work queue to see if we can start a new packet.
1280 * returns non-zero if any work was done.
1281 */
1282 static int pkt_handle_queue(struct pktcdvd_device *pd)
1283 {
1284 struct packet_data *pkt, *p;
1285 struct bio *bio = NULL;
1286 sector_t zone = 0; /* Suppress gcc warning */
1287 struct pkt_rb_node *node, *first_node;
1288 struct rb_node *n;
1289 int wakeup;
1290
1291 VPRINTK("handle_queue\n");
1292
1293 atomic_set(&pd->scan_queue, 0);
1294
1295 if (list_empty(&pd->cdrw.pkt_free_list)) {
1296 VPRINTK("handle_queue: no pkt\n");
1297 return 0;
1298 }
1299
1300 /*
1301 * Try to find a zone we are not already working on.
1302 */
1303 spin_lock(&pd->lock);
1304 first_node = pkt_rbtree_find(pd, pd->current_sector);
1305 if (!first_node) {
1306 n = rb_first(&pd->bio_queue);
1307 if (n)
1308 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1309 }
1310 node = first_node;
1311 while (node) {
1312 bio = node->bio;
1313 zone = ZONE(bio->bi_sector, pd);
1314 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1315 if (p->sector == zone) {
1316 bio = NULL;
1317 goto try_next_bio;
1318 }
1319 }
1320 break;
1321 try_next_bio:
1322 node = pkt_rbtree_next(node);
1323 if (!node) {
1324 n = rb_first(&pd->bio_queue);
1325 if (n)
1326 node = rb_entry(n, struct pkt_rb_node, rb_node);
1327 }
1328 if (node == first_node)
1329 node = NULL;
1330 }
1331 spin_unlock(&pd->lock);
1332 if (!bio) {
1333 VPRINTK("handle_queue: no bio\n");
1334 return 0;
1335 }
1336
1337 pkt = pkt_get_packet_data(pd, zone);
1338
1339 pd->current_sector = zone + pd->settings.size;
1340 pkt->sector = zone;
1341 BUG_ON(pkt->frames != pd->settings.size >> 2);
1342 pkt->write_size = 0;
1343
1344 /*
1345 * Scan work queue for bios in the same zone and link them
1346 * to this packet.
1347 */
1348 spin_lock(&pd->lock);
1349 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
1350 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1351 bio = node->bio;
1352 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1353 (unsigned long long)ZONE(bio->bi_sector, pd));
1354 if (ZONE(bio->bi_sector, pd) != zone)
1355 break;
1356 pkt_rbtree_erase(pd, node);
1357 spin_lock(&pkt->lock);
1358 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
1359 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
1360 spin_unlock(&pkt->lock);
1361 }
1362 /* check write congestion marks, and if bio_queue_size is
1363 below, wake up any waiters */
1364 wakeup = (pd->write_congestion_on > 0
1365 && pd->bio_queue_size <= pd->write_congestion_off);
1366 spin_unlock(&pd->lock);
1367 if (wakeup)
1368 clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE);
1369
1370 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1371 pkt_set_state(pkt, PACKET_WAITING_STATE);
1372 atomic_set(&pkt->run_sm, 1);
1373
1374 spin_lock(&pd->cdrw.active_list_lock);
1375 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1376 spin_unlock(&pd->cdrw.active_list_lock);
1377
1378 return 1;
1379 }
1380
1381 /*
1382 * Assemble a bio to write one packet and queue the bio for processing
1383 * by the underlying block device.
1384 */
1385 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1386 {
1387 struct bio *bio;
1388 int f;
1389 int frames_write;
1390 struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
1391
1392 for (f = 0; f < pkt->frames; f++) {
1393 bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1394 bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1395 }
1396
1397 /*
1398 * Fill-in bvec with data from orig_bios.
1399 */
1400 frames_write = 0;
1401 spin_lock(&pkt->lock);
1402 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1403 int segment = bio->bi_idx;
1404 int src_offs = 0;
1405 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1406 int num_frames = bio->bi_size / CD_FRAMESIZE;
1407 BUG_ON(first_frame < 0);
1408 BUG_ON(first_frame + num_frames > pkt->frames);
1409 for (f = first_frame; f < first_frame + num_frames; f++) {
1410 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1411
1412 while (src_offs >= src_bvl->bv_len) {
1413 src_offs -= src_bvl->bv_len;
1414 segment++;
1415 BUG_ON(segment >= bio->bi_vcnt);
1416 src_bvl = bio_iovec_idx(bio, segment);
1417 }
1418
1419 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1420 bvec[f].bv_page = src_bvl->bv_page;
1421 bvec[f].bv_offset = src_bvl->bv_offset + src_offs;
1422 } else {
1423 pkt_copy_bio_data(bio, segment, src_offs,
1424 bvec[f].bv_page, bvec[f].bv_offset);
1425 }
1426 src_offs += CD_FRAMESIZE;
1427 frames_write++;
1428 }
1429 }
1430 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1431 spin_unlock(&pkt->lock);
1432
1433 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1434 frames_write, (unsigned long long)pkt->sector);
1435 BUG_ON(frames_write != pkt->write_size);
1436
1437 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1438 pkt_make_local_copy(pkt, bvec);
1439 pkt->cache_valid = 1;
1440 } else {
1441 pkt->cache_valid = 0;
1442 }
1443
1444 /* Start the write request */
1445 bio_init(pkt->w_bio);
1446 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1447 pkt->w_bio->bi_sector = pkt->sector;
1448 pkt->w_bio->bi_bdev = pd->bdev;
1449 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1450 pkt->w_bio->bi_private = pkt;
1451 for (f = 0; f < pkt->frames; f++)
1452 if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
1453 BUG();
1454 VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt);
1455
1456 atomic_set(&pkt->io_wait, 1);
1457 pkt->w_bio->bi_rw = WRITE;
1458 pkt_queue_bio(pd, pkt->w_bio);
1459 }
1460
1461 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1462 {
1463 struct bio *bio, *next;
1464
1465 if (!uptodate)
1466 pkt->cache_valid = 0;
1467
1468 /* Finish all bios corresponding to this packet */
1469 bio = pkt->orig_bios;
1470 while (bio) {
1471 next = bio->bi_next;
1472 bio->bi_next = NULL;
1473 bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
1474 bio = next;
1475 }
1476 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1477 }
1478
1479 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1480 {
1481 int uptodate;
1482
1483 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1484
1485 for (;;) {
1486 switch (pkt->state) {
1487 case PACKET_WAITING_STATE:
1488 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1489 return;
1490
1491 pkt->sleep_time = 0;
1492 pkt_gather_data(pd, pkt);
1493 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1494 break;
1495
1496 case PACKET_READ_WAIT_STATE:
1497 if (atomic_read(&pkt->io_wait) > 0)
1498 return;
1499
1500 if (atomic_read(&pkt->io_errors) > 0) {
1501 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1502 } else {
1503 pkt_start_write(pd, pkt);
1504 }
1505 break;
1506
1507 case PACKET_WRITE_WAIT_STATE:
1508 if (atomic_read(&pkt->io_wait) > 0)
1509 return;
1510
1511 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1512 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1513 } else {
1514 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1515 }
1516 break;
1517
1518 case PACKET_RECOVERY_STATE:
1519 if (pkt_start_recovery(pkt)) {
1520 pkt_start_write(pd, pkt);
1521 } else {
1522 VPRINTK("No recovery possible\n");
1523 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1524 }
1525 break;
1526
1527 case PACKET_FINISHED_STATE:
1528 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1529 pkt_finish_packet(pkt, uptodate);
1530 return;
1531
1532 default:
1533 BUG();
1534 break;
1535 }
1536 }
1537 }
1538
1539 static void pkt_handle_packets(struct pktcdvd_device *pd)
1540 {
1541 struct packet_data *pkt, *next;
1542
1543 VPRINTK("pkt_handle_packets\n");
1544
1545 /*
1546 * Run state machine for active packets
1547 */
1548 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1549 if (atomic_read(&pkt->run_sm) > 0) {
1550 atomic_set(&pkt->run_sm, 0);
1551 pkt_run_state_machine(pd, pkt);
1552 }
1553 }
1554
1555 /*
1556 * Move no longer active packets to the free list
1557 */
1558 spin_lock(&pd->cdrw.active_list_lock);
1559 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1560 if (pkt->state == PACKET_FINISHED_STATE) {
1561 list_del(&pkt->list);
1562 pkt_put_packet_data(pd, pkt);
1563 pkt_set_state(pkt, PACKET_IDLE_STATE);
1564 atomic_set(&pd->scan_queue, 1);
1565 }
1566 }
1567 spin_unlock(&pd->cdrw.active_list_lock);
1568 }
1569
1570 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1571 {
1572 struct packet_data *pkt;
1573 int i;
1574
1575 for (i = 0; i < PACKET_NUM_STATES; i++)
1576 states[i] = 0;
1577
1578 spin_lock(&pd->cdrw.active_list_lock);
1579 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1580 states[pkt->state]++;
1581 }
1582 spin_unlock(&pd->cdrw.active_list_lock);
1583 }
1584
1585 /*
1586 * kcdrwd is woken up when writes have been queued for one of our
1587 * registered devices
1588 */
1589 static int kcdrwd(void *foobar)
1590 {
1591 struct pktcdvd_device *pd = foobar;
1592 struct packet_data *pkt;
1593 long min_sleep_time, residue;
1594
1595 set_user_nice(current, -20);
1596
1597 for (;;) {
1598 DECLARE_WAITQUEUE(wait, current);
1599
1600 /*
1601 * Wait until there is something to do
1602 */
1603 add_wait_queue(&pd->wqueue, &wait);
1604 for (;;) {
1605 set_current_state(TASK_INTERRUPTIBLE);
1606
1607 /* Check if we need to run pkt_handle_queue */
1608 if (atomic_read(&pd->scan_queue) > 0)
1609 goto work_to_do;
1610
1611 /* Check if we need to run the state machine for some packet */
1612 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1613 if (atomic_read(&pkt->run_sm) > 0)
1614 goto work_to_do;
1615 }
1616
1617 /* Check if we need to process the iosched queues */
1618 if (atomic_read(&pd->iosched.attention) != 0)
1619 goto work_to_do;
1620
1621 /* Otherwise, go to sleep */
1622 if (PACKET_DEBUG > 1) {
1623 int states[PACKET_NUM_STATES];
1624 pkt_count_states(pd, states);
1625 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1626 states[0], states[1], states[2], states[3],
1627 states[4], states[5]);
1628 }
1629
1630 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1631 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1632 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1633 min_sleep_time = pkt->sleep_time;
1634 }
1635
1636 generic_unplug_device(bdev_get_queue(pd->bdev));
1637
1638 VPRINTK("kcdrwd: sleeping\n");
1639 residue = schedule_timeout(min_sleep_time);
1640 VPRINTK("kcdrwd: wake up\n");
1641
1642 /* make swsusp happy with our thread */
1643 try_to_freeze();
1644
1645 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1646 if (!pkt->sleep_time)
1647 continue;
1648 pkt->sleep_time -= min_sleep_time - residue;
1649 if (pkt->sleep_time <= 0) {
1650 pkt->sleep_time = 0;
1651 atomic_inc(&pkt->run_sm);
1652 }
1653 }
1654
1655 if (signal_pending(current)) {
1656 flush_signals(current);
1657 }
1658 if (kthread_should_stop())
1659 break;
1660 }
1661 work_to_do:
1662 set_current_state(TASK_RUNNING);
1663 remove_wait_queue(&pd->wqueue, &wait);
1664
1665 if (kthread_should_stop())
1666 break;
1667
1668 /*
1669 * if pkt_handle_queue returns true, we can queue
1670 * another request.
1671 */
1672 while (pkt_handle_queue(pd))
1673 ;
1674
1675 /*
1676 * Handle packet state machine
1677 */
1678 pkt_handle_packets(pd);
1679
1680 /*
1681 * Handle iosched queues
1682 */
1683 pkt_iosched_process_queue(pd);
1684 }
1685
1686 return 0;
1687 }
1688
1689 static void pkt_print_settings(struct pktcdvd_device *pd)
1690 {
1691 printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1692 printk("%u blocks, ", pd->settings.size >> 2);
1693 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1694 }
1695
1696 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1697 {
1698 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1699
1700 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1701 cgc->cmd[2] = page_code | (page_control << 6);
1702 cgc->cmd[7] = cgc->buflen >> 8;
1703 cgc->cmd[8] = cgc->buflen & 0xff;
1704 cgc->data_direction = CGC_DATA_READ;
1705 return pkt_generic_packet(pd, cgc);
1706 }
1707
1708 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1709 {
1710 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1711 memset(cgc->buffer, 0, 2);
1712 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1713 cgc->cmd[1] = 0x10; /* PF */
1714 cgc->cmd[7] = cgc->buflen >> 8;
1715 cgc->cmd[8] = cgc->buflen & 0xff;
1716 cgc->data_direction = CGC_DATA_WRITE;
1717 return pkt_generic_packet(pd, cgc);
1718 }
1719
1720 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1721 {
1722 struct packet_command cgc;
1723 int ret;
1724
1725 /* set up command and get the disc info */
1726 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1727 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1728 cgc.cmd[8] = cgc.buflen = 2;
1729 cgc.quiet = 1;
1730
1731 if ((ret = pkt_generic_packet(pd, &cgc)))
1732 return ret;
1733
1734 /* not all drives have the same disc_info length, so requeue
1735 * packet with the length the drive tells us it can supply
1736 */
1737 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1738 sizeof(di->disc_information_length);
1739
1740 if (cgc.buflen > sizeof(disc_information))
1741 cgc.buflen = sizeof(disc_information);
1742
1743 cgc.cmd[8] = cgc.buflen;
1744 return pkt_generic_packet(pd, &cgc);
1745 }
1746
1747 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1748 {
1749 struct packet_command cgc;
1750 int ret;
1751
1752 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1753 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1754 cgc.cmd[1] = type & 3;
1755 cgc.cmd[4] = (track & 0xff00) >> 8;
1756 cgc.cmd[5] = track & 0xff;
1757 cgc.cmd[8] = 8;
1758 cgc.quiet = 1;
1759
1760 if ((ret = pkt_generic_packet(pd, &cgc)))
1761 return ret;
1762
1763 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1764 sizeof(ti->track_information_length);
1765
1766 if (cgc.buflen > sizeof(track_information))
1767 cgc.buflen = sizeof(track_information);
1768
1769 cgc.cmd[8] = cgc.buflen;
1770 return pkt_generic_packet(pd, &cgc);
1771 }
1772
1773 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1774 {
1775 disc_information di;
1776 track_information ti;
1777 __u32 last_track;
1778 int ret = -1;
1779
1780 if ((ret = pkt_get_disc_info(pd, &di)))
1781 return ret;
1782
1783 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1784 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1785 return ret;
1786
1787 /* if this track is blank, try the previous. */
1788 if (ti.blank) {
1789 last_track--;
1790 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1791 return ret;
1792 }
1793
1794 /* if last recorded field is valid, return it. */
1795 if (ti.lra_v) {
1796 *last_written = be32_to_cpu(ti.last_rec_address);
1797 } else {
1798 /* make it up instead */
1799 *last_written = be32_to_cpu(ti.track_start) +
1800 be32_to_cpu(ti.track_size);
1801 if (ti.free_blocks)
1802 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1803 }
1804 return 0;
1805 }
1806
1807 /*
1808 * write mode select package based on pd->settings
1809 */
1810 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1811 {
1812 struct packet_command cgc;
1813 struct request_sense sense;
1814 write_param_page *wp;
1815 char buffer[128];
1816 int ret, size;
1817
1818 /* doesn't apply to DVD+RW or DVD-RAM */
1819 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1820 return 0;
1821
1822 memset(buffer, 0, sizeof(buffer));
1823 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1824 cgc.sense = &sense;
1825 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1826 pkt_dump_sense(&cgc);
1827 return ret;
1828 }
1829
1830 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1831 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1832 if (size > sizeof(buffer))
1833 size = sizeof(buffer);
1834
1835 /*
1836 * now get it all
1837 */
1838 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1839 cgc.sense = &sense;
1840 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1841 pkt_dump_sense(&cgc);
1842 return ret;
1843 }
1844
1845 /*
1846 * write page is offset header + block descriptor length
1847 */
1848 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1849
1850 wp->fp = pd->settings.fp;
1851 wp->track_mode = pd->settings.track_mode;
1852 wp->write_type = pd->settings.write_type;
1853 wp->data_block_type = pd->settings.block_mode;
1854
1855 wp->multi_session = 0;
1856
1857 #ifdef PACKET_USE_LS
1858 wp->link_size = 7;
1859 wp->ls_v = 1;
1860 #endif
1861
1862 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1863 wp->session_format = 0;
1864 wp->subhdr2 = 0x20;
1865 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1866 wp->session_format = 0x20;
1867 wp->subhdr2 = 8;
1868 #if 0
1869 wp->mcn[0] = 0x80;
1870 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1871 #endif
1872 } else {
1873 /*
1874 * paranoia
1875 */
1876 printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type);
1877 return 1;
1878 }
1879 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1880
1881 cgc.buflen = cgc.cmd[8] = size;
1882 if ((ret = pkt_mode_select(pd, &cgc))) {
1883 pkt_dump_sense(&cgc);
1884 return ret;
1885 }
1886
1887 pkt_print_settings(pd);
1888 return 0;
1889 }
1890
1891 /*
1892 * 1 -- we can write to this track, 0 -- we can't
1893 */
1894 static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
1895 {
1896 switch (pd->mmc3_profile) {
1897 case 0x1a: /* DVD+RW */
1898 case 0x12: /* DVD-RAM */
1899 /* The track is always writable on DVD+RW/DVD-RAM */
1900 return 1;
1901 default:
1902 break;
1903 }
1904
1905 if (!ti->packet || !ti->fp)
1906 return 0;
1907
1908 /*
1909 * "good" settings as per Mt Fuji.
1910 */
1911 if (ti->rt == 0 && ti->blank == 0)
1912 return 1;
1913
1914 if (ti->rt == 0 && ti->blank == 1)
1915 return 1;
1916
1917 if (ti->rt == 1 && ti->blank == 0)
1918 return 1;
1919
1920 printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1921 return 0;
1922 }
1923
1924 /*
1925 * 1 -- we can write to this disc, 0 -- we can't
1926 */
1927 static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
1928 {
1929 switch (pd->mmc3_profile) {
1930 case 0x0a: /* CD-RW */
1931 case 0xffff: /* MMC3 not supported */
1932 break;
1933 case 0x1a: /* DVD+RW */
1934 case 0x13: /* DVD-RW */
1935 case 0x12: /* DVD-RAM */
1936 return 1;
1937 default:
1938 VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile);
1939 return 0;
1940 }
1941
1942 /*
1943 * for disc type 0xff we should probably reserve a new track.
1944 * but i'm not sure, should we leave this to user apps? probably.
1945 */
1946 if (di->disc_type == 0xff) {
1947 printk(DRIVER_NAME": Unknown disc. No track?\n");
1948 return 0;
1949 }
1950
1951 if (di->disc_type != 0x20 && di->disc_type != 0) {
1952 printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type);
1953 return 0;
1954 }
1955
1956 if (di->erasable == 0) {
1957 printk(DRIVER_NAME": Disc not erasable\n");
1958 return 0;
1959 }
1960
1961 if (di->border_status == PACKET_SESSION_RESERVED) {
1962 printk(DRIVER_NAME": Can't write to last track (reserved)\n");
1963 return 0;
1964 }
1965
1966 return 1;
1967 }
1968
1969 static int pkt_probe_settings(struct pktcdvd_device *pd)
1970 {
1971 struct packet_command cgc;
1972 unsigned char buf[12];
1973 disc_information di;
1974 track_information ti;
1975 int ret, track;
1976
1977 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1978 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1979 cgc.cmd[8] = 8;
1980 ret = pkt_generic_packet(pd, &cgc);
1981 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1982
1983 memset(&di, 0, sizeof(disc_information));
1984 memset(&ti, 0, sizeof(track_information));
1985
1986 if ((ret = pkt_get_disc_info(pd, &di))) {
1987 printk("failed get_disc\n");
1988 return ret;
1989 }
1990
1991 if (!pkt_writable_disc(pd, &di))
1992 return -EROFS;
1993
1994 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1995
1996 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1997 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1998 printk(DRIVER_NAME": failed get_track\n");
1999 return ret;
2000 }
2001
2002 if (!pkt_writable_track(pd, &ti)) {
2003 printk(DRIVER_NAME": can't write to this track\n");
2004 return -EROFS;
2005 }
2006
2007 /*
2008 * we keep packet size in 512 byte units, makes it easier to
2009 * deal with request calculations.
2010 */
2011 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
2012 if (pd->settings.size == 0) {
2013 printk(DRIVER_NAME": detected zero packet size!\n");
2014 return -ENXIO;
2015 }
2016 if (pd->settings.size > PACKET_MAX_SECTORS) {
2017 printk(DRIVER_NAME": packet size is too big\n");
2018 return -EROFS;
2019 }
2020 pd->settings.fp = ti.fp;
2021 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
2022
2023 if (ti.nwa_v) {
2024 pd->nwa = be32_to_cpu(ti.next_writable);
2025 set_bit(PACKET_NWA_VALID, &pd->flags);
2026 }
2027
2028 /*
2029 * in theory we could use lra on -RW media as well and just zero
2030 * blocks that haven't been written yet, but in practice that
2031 * is just a no-go. we'll use that for -R, naturally.
2032 */
2033 if (ti.lra_v) {
2034 pd->lra = be32_to_cpu(ti.last_rec_address);
2035 set_bit(PACKET_LRA_VALID, &pd->flags);
2036 } else {
2037 pd->lra = 0xffffffff;
2038 set_bit(PACKET_LRA_VALID, &pd->flags);
2039 }
2040
2041 /*
2042 * fine for now
2043 */
2044 pd->settings.link_loss = 7;
2045 pd->settings.write_type = 0; /* packet */
2046 pd->settings.track_mode = ti.track_mode;
2047
2048 /*
2049 * mode1 or mode2 disc
2050 */
2051 switch (ti.data_mode) {
2052 case PACKET_MODE1:
2053 pd->settings.block_mode = PACKET_BLOCK_MODE1;
2054 break;
2055 case PACKET_MODE2:
2056 pd->settings.block_mode = PACKET_BLOCK_MODE2;
2057 break;
2058 default:
2059 printk(DRIVER_NAME": unknown data mode\n");
2060 return -EROFS;
2061 }
2062 return 0;
2063 }
2064
2065 /*
2066 * enable/disable write caching on drive
2067 */
2068 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
2069 {
2070 struct packet_command cgc;
2071 struct request_sense sense;
2072 unsigned char buf[64];
2073 int ret;
2074
2075 memset(buf, 0, sizeof(buf));
2076 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
2077 cgc.sense = &sense;
2078 cgc.buflen = pd->mode_offset + 12;
2079
2080 /*
2081 * caching mode page might not be there, so quiet this command
2082 */
2083 cgc.quiet = 1;
2084
2085 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
2086 return ret;
2087
2088 buf[pd->mode_offset + 10] |= (!!set << 2);
2089
2090 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
2091 ret = pkt_mode_select(pd, &cgc);
2092 if (ret) {
2093 printk(DRIVER_NAME": write caching control failed\n");
2094 pkt_dump_sense(&cgc);
2095 } else if (!ret && set)
2096 printk(DRIVER_NAME": enabled write caching on %s\n", pd->name);
2097 return ret;
2098 }
2099
2100 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
2101 {
2102 struct packet_command cgc;
2103
2104 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2105 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
2106 cgc.cmd[4] = lockflag ? 1 : 0;
2107 return pkt_generic_packet(pd, &cgc);
2108 }
2109
2110 /*
2111 * Returns drive maximum write speed
2112 */
2113 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
2114 {
2115 struct packet_command cgc;
2116 struct request_sense sense;
2117 unsigned char buf[256+18];
2118 unsigned char *cap_buf;
2119 int ret, offset;
2120
2121 memset(buf, 0, sizeof(buf));
2122 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
2123 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
2124 cgc.sense = &sense;
2125
2126 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2127 if (ret) {
2128 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
2129 sizeof(struct mode_page_header);
2130 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2131 if (ret) {
2132 pkt_dump_sense(&cgc);
2133 return ret;
2134 }
2135 }
2136
2137 offset = 20; /* Obsoleted field, used by older drives */
2138 if (cap_buf[1] >= 28)
2139 offset = 28; /* Current write speed selected */
2140 if (cap_buf[1] >= 30) {
2141 /* If the drive reports at least one "Logical Unit Write
2142 * Speed Performance Descriptor Block", use the information
2143 * in the first block. (contains the highest speed)
2144 */
2145 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
2146 if (num_spdb > 0)
2147 offset = 34;
2148 }
2149
2150 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
2151 return 0;
2152 }
2153
2154 /* These tables from cdrecord - I don't have orange book */
2155 /* standard speed CD-RW (1-4x) */
2156 static char clv_to_speed[16] = {
2157 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2158 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2159 };
2160 /* high speed CD-RW (-10x) */
2161 static char hs_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, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2164 };
2165 /* ultra high speed CD-RW */
2166 static char us_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, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2169 };
2170
2171 /*
2172 * reads the maximum media speed from ATIP
2173 */
2174 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
2175 {
2176 struct packet_command cgc;
2177 struct request_sense sense;
2178 unsigned char buf[64];
2179 unsigned int size, st, sp;
2180 int ret;
2181
2182 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2183 cgc.sense = &sense;
2184 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2185 cgc.cmd[1] = 2;
2186 cgc.cmd[2] = 4; /* READ ATIP */
2187 cgc.cmd[8] = 2;
2188 ret = pkt_generic_packet(pd, &cgc);
2189 if (ret) {
2190 pkt_dump_sense(&cgc);
2191 return ret;
2192 }
2193 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2194 if (size > sizeof(buf))
2195 size = sizeof(buf);
2196
2197 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2198 cgc.sense = &sense;
2199 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2200 cgc.cmd[1] = 2;
2201 cgc.cmd[2] = 4;
2202 cgc.cmd[8] = size;
2203 ret = pkt_generic_packet(pd, &cgc);
2204 if (ret) {
2205 pkt_dump_sense(&cgc);
2206 return ret;
2207 }
2208
2209 if (!buf[6] & 0x40) {
2210 printk(DRIVER_NAME": Disc type is not CD-RW\n");
2211 return 1;
2212 }
2213 if (!buf[6] & 0x4) {
2214 printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n");
2215 return 1;
2216 }
2217
2218 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2219
2220 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2221
2222 /* Info from cdrecord */
2223 switch (st) {
2224 case 0: /* standard speed */
2225 *speed = clv_to_speed[sp];
2226 break;
2227 case 1: /* high speed */
2228 *speed = hs_clv_to_speed[sp];
2229 break;
2230 case 2: /* ultra high speed */
2231 *speed = us_clv_to_speed[sp];
2232 break;
2233 default:
2234 printk(DRIVER_NAME": Unknown disc sub-type %d\n",st);
2235 return 1;
2236 }
2237 if (*speed) {
2238 printk(DRIVER_NAME": Max. media speed: %d\n",*speed);
2239 return 0;
2240 } else {
2241 printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st);
2242 return 1;
2243 }
2244 }
2245
2246 static int pkt_perform_opc(struct pktcdvd_device *pd)
2247 {
2248 struct packet_command cgc;
2249 struct request_sense sense;
2250 int ret;
2251
2252 VPRINTK(DRIVER_NAME": Performing OPC\n");
2253
2254 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2255 cgc.sense = &sense;
2256 cgc.timeout = 60*HZ;
2257 cgc.cmd[0] = GPCMD_SEND_OPC;
2258 cgc.cmd[1] = 1;
2259 if ((ret = pkt_generic_packet(pd, &cgc)))
2260 pkt_dump_sense(&cgc);
2261 return ret;
2262 }
2263
2264 static int pkt_open_write(struct pktcdvd_device *pd)
2265 {
2266 int ret;
2267 unsigned int write_speed, media_write_speed, read_speed;
2268
2269 if ((ret = pkt_probe_settings(pd))) {
2270 VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name);
2271 return ret;
2272 }
2273
2274 if ((ret = pkt_set_write_settings(pd))) {
2275 DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name);
2276 return -EIO;
2277 }
2278
2279 pkt_write_caching(pd, USE_WCACHING);
2280
2281 if ((ret = pkt_get_max_speed(pd, &write_speed)))
2282 write_speed = 16 * 177;
2283 switch (pd->mmc3_profile) {
2284 case 0x13: /* DVD-RW */
2285 case 0x1a: /* DVD+RW */
2286 case 0x12: /* DVD-RAM */
2287 DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed);
2288 break;
2289 default:
2290 if ((ret = pkt_media_speed(pd, &media_write_speed)))
2291 media_write_speed = 16;
2292 write_speed = min(write_speed, media_write_speed * 177);
2293 DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176);
2294 break;
2295 }
2296 read_speed = write_speed;
2297
2298 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
2299 DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name);
2300 return -EIO;
2301 }
2302 pd->write_speed = write_speed;
2303 pd->read_speed = read_speed;
2304
2305 if ((ret = pkt_perform_opc(pd))) {
2306 DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name);
2307 }
2308
2309 return 0;
2310 }
2311
2312 /*
2313 * called at open time.
2314 */
2315 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
2316 {
2317 int ret;
2318 long lba;
2319 request_queue_t *q;
2320
2321 /*
2322 * We need to re-open the cdrom device without O_NONBLOCK to be able
2323 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2324 * so bdget() can't fail.
2325 */
2326 bdget(pd->bdev->bd_dev);
2327 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
2328 goto out;
2329
2330 if ((ret = bd_claim(pd->bdev, pd)))
2331 goto out_putdev;
2332
2333 if ((ret = pkt_get_last_written(pd, &lba))) {
2334 printk(DRIVER_NAME": pkt_get_last_written failed\n");
2335 goto out_unclaim;
2336 }
2337
2338 set_capacity(pd->disk, lba << 2);
2339 set_capacity(pd->bdev->bd_disk, lba << 2);
2340 bd_set_size(pd->bdev, (loff_t)lba << 11);
2341
2342 q = bdev_get_queue(pd->bdev);
2343 if (write) {
2344 if ((ret = pkt_open_write(pd)))
2345 goto out_unclaim;
2346 /*
2347 * Some CDRW drives can not handle writes larger than one packet,
2348 * even if the size is a multiple of the packet size.
2349 */
2350 spin_lock_irq(q->queue_lock);
2351 blk_queue_max_sectors(q, pd->settings.size);
2352 spin_unlock_irq(q->queue_lock);
2353 set_bit(PACKET_WRITABLE, &pd->flags);
2354 } else {
2355 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2356 clear_bit(PACKET_WRITABLE, &pd->flags);
2357 }
2358
2359 if ((ret = pkt_set_segment_merging(pd, q)))
2360 goto out_unclaim;
2361
2362 if (write) {
2363 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2364 printk(DRIVER_NAME": not enough memory for buffers\n");
2365 ret = -ENOMEM;
2366 goto out_unclaim;
2367 }
2368 printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
2369 }
2370
2371 return 0;
2372
2373 out_unclaim:
2374 bd_release(pd->bdev);
2375 out_putdev:
2376 blkdev_put(pd->bdev);
2377 out:
2378 return ret;
2379 }
2380
2381 /*
2382 * called when the device is closed. makes sure that the device flushes
2383 * the internal cache before we close.
2384 */
2385 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2386 {
2387 if (flush && pkt_flush_cache(pd))
2388 DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name);
2389
2390 pkt_lock_door(pd, 0);
2391
2392 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2393 bd_release(pd->bdev);
2394 blkdev_put(pd->bdev);
2395
2396 pkt_shrink_pktlist(pd);
2397 }
2398
2399 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2400 {
2401 if (dev_minor >= MAX_WRITERS)
2402 return NULL;
2403 return pkt_devs[dev_minor];
2404 }
2405
2406 static int pkt_open(struct inode *inode, struct file *file)
2407 {
2408 struct pktcdvd_device *pd = NULL;
2409 int ret;
2410
2411 VPRINTK(DRIVER_NAME": entering open\n");
2412
2413 mutex_lock(&ctl_mutex);
2414 pd = pkt_find_dev_from_minor(iminor(inode));
2415 if (!pd) {
2416 ret = -ENODEV;
2417 goto out;
2418 }
2419 BUG_ON(pd->refcnt < 0);
2420
2421 pd->refcnt++;
2422 if (pd->refcnt > 1) {
2423 if ((file->f_mode & FMODE_WRITE) &&
2424 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2425 ret = -EBUSY;
2426 goto out_dec;
2427 }
2428 } else {
2429 ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE);
2430 if (ret)
2431 goto out_dec;
2432 /*
2433 * needed here as well, since ext2 (among others) may change
2434 * the blocksize at mount time
2435 */
2436 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2437 }
2438
2439 mutex_unlock(&ctl_mutex);
2440 return 0;
2441
2442 out_dec:
2443 pd->refcnt--;
2444 out:
2445 VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
2446 mutex_unlock(&ctl_mutex);
2447 return ret;
2448 }
2449
2450 static int pkt_close(struct inode *inode, struct file *file)
2451 {
2452 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2453 int ret = 0;
2454
2455 mutex_lock(&ctl_mutex);
2456 pd->refcnt--;
2457 BUG_ON(pd->refcnt < 0);
2458 if (pd->refcnt == 0) {
2459 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2460 pkt_release_dev(pd, flush);
2461 }
2462 mutex_unlock(&ctl_mutex);
2463 return ret;
2464 }
2465
2466
2467 static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
2468 {
2469 struct packet_stacked_data *psd = bio->bi_private;
2470 struct pktcdvd_device *pd = psd->pd;
2471
2472 if (bio->bi_size)
2473 return 1;
2474
2475 bio_put(bio);
2476 bio_endio(psd->bio, psd->bio->bi_size, err);
2477 mempool_free(psd, psd_pool);
2478 pkt_bio_finished(pd);
2479 return 0;
2480 }
2481
2482 static int pkt_make_request(request_queue_t *q, struct bio *bio)
2483 {
2484 struct pktcdvd_device *pd;
2485 char b[BDEVNAME_SIZE];
2486 sector_t zone;
2487 struct packet_data *pkt;
2488 int was_empty, blocked_bio;
2489 struct pkt_rb_node *node;
2490
2491 pd = q->queuedata;
2492 if (!pd) {
2493 printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2494 goto end_io;
2495 }
2496
2497 /*
2498 * Clone READ bios so we can have our own bi_end_io callback.
2499 */
2500 if (bio_data_dir(bio) == READ) {
2501 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2502 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2503
2504 psd->pd = pd;
2505 psd->bio = bio;
2506 cloned_bio->bi_bdev = pd->bdev;
2507 cloned_bio->bi_private = psd;
2508 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2509 pd->stats.secs_r += bio->bi_size >> 9;
2510 pkt_queue_bio(pd, cloned_bio);
2511 return 0;
2512 }
2513
2514 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2515 printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n",
2516 pd->name, (unsigned long long)bio->bi_sector);
2517 goto end_io;
2518 }
2519
2520 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2521 printk(DRIVER_NAME": wrong bio size\n");
2522 goto end_io;
2523 }
2524
2525 blk_queue_bounce(q, &bio);
2526
2527 zone = ZONE(bio->bi_sector, pd);
2528 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2529 (unsigned long long)bio->bi_sector,
2530 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2531
2532 /* Check if we have to split the bio */
2533 {
2534 struct bio_pair *bp;
2535 sector_t last_zone;
2536 int first_sectors;
2537
2538 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2539 if (last_zone != zone) {
2540 BUG_ON(last_zone != zone + pd->settings.size);
2541 first_sectors = last_zone - bio->bi_sector;
2542 bp = bio_split(bio, bio_split_pool, first_sectors);
2543 BUG_ON(!bp);
2544 pkt_make_request(q, &bp->bio1);
2545 pkt_make_request(q, &bp->bio2);
2546 bio_pair_release(bp);
2547 return 0;
2548 }
2549 }
2550
2551 /*
2552 * If we find a matching packet in state WAITING or READ_WAIT, we can
2553 * just append this bio to that packet.
2554 */
2555 spin_lock(&pd->cdrw.active_list_lock);
2556 blocked_bio = 0;
2557 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2558 if (pkt->sector == zone) {
2559 spin_lock(&pkt->lock);
2560 if ((pkt->state == PACKET_WAITING_STATE) ||
2561 (pkt->state == PACKET_READ_WAIT_STATE)) {
2562 pkt_add_list_last(bio, &pkt->orig_bios,
2563 &pkt->orig_bios_tail);
2564 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2565 if ((pkt->write_size >= pkt->frames) &&
2566 (pkt->state == PACKET_WAITING_STATE)) {
2567 atomic_inc(&pkt->run_sm);
2568 wake_up(&pd->wqueue);
2569 }
2570 spin_unlock(&pkt->lock);
2571 spin_unlock(&pd->cdrw.active_list_lock);
2572 return 0;
2573 } else {
2574 blocked_bio = 1;
2575 }
2576 spin_unlock(&pkt->lock);
2577 }
2578 }
2579 spin_unlock(&pd->cdrw.active_list_lock);
2580
2581 /*
2582 * Test if there is enough room left in the bio work queue
2583 * (queue size >= congestion on mark).
2584 * If not, wait till the work queue size is below the congestion off mark.
2585 */
2586 spin_lock(&pd->lock);
2587 if (pd->write_congestion_on > 0
2588 && pd->bio_queue_size >= pd->write_congestion_on) {
2589 set_bdi_congested(&q->backing_dev_info, WRITE);
2590 do {
2591 spin_unlock(&pd->lock);
2592 congestion_wait(WRITE, HZ);
2593 spin_lock(&pd->lock);
2594 } while(pd->bio_queue_size > pd->write_congestion_off);
2595 }
2596 spin_unlock(&pd->lock);
2597
2598 /*
2599 * No matching packet found. Store the bio in the work queue.
2600 */
2601 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2602 node->bio = bio;
2603 spin_lock(&pd->lock);
2604 BUG_ON(pd->bio_queue_size < 0);
2605 was_empty = (pd->bio_queue_size == 0);
2606 pkt_rbtree_insert(pd, node);
2607 spin_unlock(&pd->lock);
2608
2609 /*
2610 * Wake up the worker thread.
2611 */
2612 atomic_set(&pd->scan_queue, 1);
2613 if (was_empty) {
2614 /* This wake_up is required for correct operation */
2615 wake_up(&pd->wqueue);
2616 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2617 /*
2618 * This wake up is not required for correct operation,
2619 * but improves performance in some cases.
2620 */
2621 wake_up(&pd->wqueue);
2622 }
2623 return 0;
2624 end_io:
2625 bio_io_error(bio, bio->bi_size);
2626 return 0;
2627 }
2628
2629
2630
2631 static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec)
2632 {
2633 struct pktcdvd_device *pd = q->queuedata;
2634 sector_t zone = ZONE(bio->bi_sector, pd);
2635 int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2636 int remaining = (pd->settings.size << 9) - used;
2637 int remaining2;
2638
2639 /*
2640 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2641 * boundary, pkt_make_request() will split the bio.
2642 */
2643 remaining2 = PAGE_SIZE - bio->bi_size;
2644 remaining = max(remaining, remaining2);
2645
2646 BUG_ON(remaining < 0);
2647 return remaining;
2648 }
2649
2650 static void pkt_init_queue(struct pktcdvd_device *pd)
2651 {
2652 request_queue_t *q = pd->disk->queue;
2653
2654 blk_queue_make_request(q, pkt_make_request);
2655 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2656 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2657 blk_queue_merge_bvec(q, pkt_merge_bvec);
2658 q->queuedata = pd;
2659 }
2660
2661 static int pkt_seq_show(struct seq_file *m, void *p)
2662 {
2663 struct pktcdvd_device *pd = m->private;
2664 char *msg;
2665 char bdev_buf[BDEVNAME_SIZE];
2666 int states[PACKET_NUM_STATES];
2667
2668 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2669 bdevname(pd->bdev, bdev_buf));
2670
2671 seq_printf(m, "\nSettings:\n");
2672 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2673
2674 if (pd->settings.write_type == 0)
2675 msg = "Packet";
2676 else
2677 msg = "Unknown";
2678 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2679
2680 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2681 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2682
2683 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2684
2685 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2686 msg = "Mode 1";
2687 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2688 msg = "Mode 2";
2689 else
2690 msg = "Unknown";
2691 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2692
2693 seq_printf(m, "\nStatistics:\n");
2694 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2695 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2696 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2697 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2698 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2699
2700 seq_printf(m, "\nMisc:\n");
2701 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2702 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2703 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2704 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2705 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2706 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2707
2708 seq_printf(m, "\nQueue state:\n");
2709 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2710 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2711 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2712
2713 pkt_count_states(pd, states);
2714 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2715 states[0], states[1], states[2], states[3], states[4], states[5]);
2716
2717 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2718 pd->write_congestion_off,
2719 pd->write_congestion_on);
2720 return 0;
2721 }
2722
2723 static int pkt_seq_open(struct inode *inode, struct file *file)
2724 {
2725 return single_open(file, pkt_seq_show, PDE(inode)->data);
2726 }
2727
2728 static const struct file_operations pkt_proc_fops = {
2729 .open = pkt_seq_open,
2730 .read = seq_read,
2731 .llseek = seq_lseek,
2732 .release = single_release
2733 };
2734
2735 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2736 {
2737 int i;
2738 int ret = 0;
2739 char b[BDEVNAME_SIZE];
2740 struct proc_dir_entry *proc;
2741 struct block_device *bdev;
2742
2743 if (pd->pkt_dev == dev) {
2744 printk(DRIVER_NAME": Recursive setup not allowed\n");
2745 return -EBUSY;
2746 }
2747 for (i = 0; i < MAX_WRITERS; i++) {
2748 struct pktcdvd_device *pd2 = pkt_devs[i];
2749 if (!pd2)
2750 continue;
2751 if (pd2->bdev->bd_dev == dev) {
2752 printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b));
2753 return -EBUSY;
2754 }
2755 if (pd2->pkt_dev == dev) {
2756 printk(DRIVER_NAME": Can't chain pktcdvd devices\n");
2757 return -EBUSY;
2758 }
2759 }
2760
2761 bdev = bdget(dev);
2762 if (!bdev)
2763 return -ENOMEM;
2764 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2765 if (ret)
2766 return ret;
2767
2768 /* This is safe, since we have a reference from open(). */
2769 __module_get(THIS_MODULE);
2770
2771 pd->bdev = bdev;
2772 set_blocksize(bdev, CD_FRAMESIZE);
2773
2774 pkt_init_queue(pd);
2775
2776 atomic_set(&pd->cdrw.pending_bios, 0);
2777 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2778 if (IS_ERR(pd->cdrw.thread)) {
2779 printk(DRIVER_NAME": can't start kernel thread\n");
2780 ret = -ENOMEM;
2781 goto out_mem;
2782 }
2783
2784 proc = create_proc_entry(pd->name, 0, pkt_proc);
2785 if (proc) {
2786 proc->data = pd;
2787 proc->proc_fops = &pkt_proc_fops;
2788 }
2789 DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2790 return 0;
2791
2792 out_mem:
2793 blkdev_put(bdev);
2794 /* This is safe: open() is still holding a reference. */
2795 module_put(THIS_MODULE);
2796 return ret;
2797 }
2798
2799 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2800 {
2801 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2802
2803 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2804
2805 switch (cmd) {
2806 /*
2807 * forward selected CDROM ioctls to CD-ROM, for UDF
2808 */
2809 case CDROMMULTISESSION:
2810 case CDROMREADTOCENTRY:
2811 case CDROM_LAST_WRITTEN:
2812 case CDROM_SEND_PACKET:
2813 case SCSI_IOCTL_SEND_COMMAND:
2814 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2815
2816 case CDROMEJECT:
2817 /*
2818 * The door gets locked when the device is opened, so we
2819 * have to unlock it or else the eject command fails.
2820 */
2821 if (pd->refcnt == 1)
2822 pkt_lock_door(pd, 0);
2823 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2824
2825 default:
2826 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
2827 return -ENOTTY;
2828 }
2829
2830 return 0;
2831 }
2832
2833 static int pkt_media_changed(struct gendisk *disk)
2834 {
2835 struct pktcdvd_device *pd = disk->private_data;
2836 struct gendisk *attached_disk;
2837
2838 if (!pd)
2839 return 0;
2840 if (!pd->bdev)
2841 return 0;
2842 attached_disk = pd->bdev->bd_disk;
2843 if (!attached_disk)
2844 return 0;
2845 return attached_disk->fops->media_changed(attached_disk);
2846 }
2847
2848 static struct block_device_operations pktcdvd_ops = {
2849 .owner = THIS_MODULE,
2850 .open = pkt_open,
2851 .release = pkt_close,
2852 .ioctl = pkt_ioctl,
2853 .media_changed = pkt_media_changed,
2854 };
2855
2856 /*
2857 * Set up mapping from pktcdvd device to CD-ROM device.
2858 */
2859 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
2860 {
2861 int idx;
2862 int ret = -ENOMEM;
2863 struct pktcdvd_device *pd;
2864 struct gendisk *disk;
2865
2866 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2867
2868 for (idx = 0; idx < MAX_WRITERS; idx++)
2869 if (!pkt_devs[idx])
2870 break;
2871 if (idx == MAX_WRITERS) {
2872 printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS);
2873 ret = -EBUSY;
2874 goto out_mutex;
2875 }
2876
2877 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2878 if (!pd)
2879 goto out_mutex;
2880
2881 pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
2882 sizeof(struct pkt_rb_node));
2883 if (!pd->rb_pool)
2884 goto out_mem;
2885
2886 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2887 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2888 spin_lock_init(&pd->cdrw.active_list_lock);
2889
2890 spin_lock_init(&pd->lock);
2891 spin_lock_init(&pd->iosched.lock);
2892 sprintf(pd->name, DRIVER_NAME"%d", idx);
2893 init_waitqueue_head(&pd->wqueue);
2894 pd->bio_queue = RB_ROOT;
2895
2896 pd->write_congestion_on = write_congestion_on;
2897 pd->write_congestion_off = write_congestion_off;
2898
2899 disk = alloc_disk(1);
2900 if (!disk)
2901 goto out_mem;
2902 pd->disk = disk;
2903 disk->major = pktdev_major;
2904 disk->first_minor = idx;
2905 disk->fops = &pktcdvd_ops;
2906 disk->flags = GENHD_FL_REMOVABLE;
2907 strcpy(disk->disk_name, pd->name);
2908 disk->private_data = pd;
2909 disk->queue = blk_alloc_queue(GFP_KERNEL);
2910 if (!disk->queue)
2911 goto out_mem2;
2912
2913 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2914 ret = pkt_new_dev(pd, dev);
2915 if (ret)
2916 goto out_new_dev;
2917
2918 add_disk(disk);
2919
2920 pkt_sysfs_dev_new(pd);
2921 pkt_debugfs_dev_new(pd);
2922
2923 pkt_devs[idx] = pd;
2924 if (pkt_dev)
2925 *pkt_dev = pd->pkt_dev;
2926
2927 mutex_unlock(&ctl_mutex);
2928 return 0;
2929
2930 out_new_dev:
2931 blk_cleanup_queue(disk->queue);
2932 out_mem2:
2933 put_disk(disk);
2934 out_mem:
2935 if (pd->rb_pool)
2936 mempool_destroy(pd->rb_pool);
2937 kfree(pd);
2938 out_mutex:
2939 mutex_unlock(&ctl_mutex);
2940 printk(DRIVER_NAME": setup of pktcdvd device failed\n");
2941 return ret;
2942 }
2943
2944 /*
2945 * Tear down mapping from pktcdvd device to CD-ROM device.
2946 */
2947 static int pkt_remove_dev(dev_t pkt_dev)
2948 {
2949 struct pktcdvd_device *pd;
2950 int idx;
2951 int ret = 0;
2952
2953 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2954
2955 for (idx = 0; idx < MAX_WRITERS; idx++) {
2956 pd = pkt_devs[idx];
2957 if (pd && (pd->pkt_dev == pkt_dev))
2958 break;
2959 }
2960 if (idx == MAX_WRITERS) {
2961 DPRINTK(DRIVER_NAME": dev not setup\n");
2962 ret = -ENXIO;
2963 goto out;
2964 }
2965
2966 if (pd->refcnt > 0) {
2967 ret = -EBUSY;
2968 goto out;
2969 }
2970 if (!IS_ERR(pd->cdrw.thread))
2971 kthread_stop(pd->cdrw.thread);
2972
2973 pkt_devs[idx] = NULL;
2974
2975 pkt_debugfs_dev_remove(pd);
2976 pkt_sysfs_dev_remove(pd);
2977
2978 blkdev_put(pd->bdev);
2979
2980 remove_proc_entry(pd->name, pkt_proc);
2981 DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name);
2982
2983 del_gendisk(pd->disk);
2984 blk_cleanup_queue(pd->disk->queue);
2985 put_disk(pd->disk);
2986
2987 mempool_destroy(pd->rb_pool);
2988 kfree(pd);
2989
2990 /* This is safe: open() is still holding a reference. */
2991 module_put(THIS_MODULE);
2992
2993 out:
2994 mutex_unlock(&ctl_mutex);
2995 return ret;
2996 }
2997
2998 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2999 {
3000 struct pktcdvd_device *pd;
3001
3002 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
3003
3004 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
3005 if (pd) {
3006 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
3007 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
3008 } else {
3009 ctrl_cmd->dev = 0;
3010 ctrl_cmd->pkt_dev = 0;
3011 }
3012 ctrl_cmd->num_devices = MAX_WRITERS;
3013
3014 mutex_unlock(&ctl_mutex);
3015 }
3016
3017 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
3018 {
3019 void __user *argp = (void __user *)arg;
3020 struct pkt_ctrl_command ctrl_cmd;
3021 int ret = 0;
3022 dev_t pkt_dev = 0;
3023
3024 if (cmd != PACKET_CTRL_CMD)
3025 return -ENOTTY;
3026
3027 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
3028 return -EFAULT;
3029
3030 switch (ctrl_cmd.command) {
3031 case PKT_CTRL_CMD_SETUP:
3032 if (!capable(CAP_SYS_ADMIN))
3033 return -EPERM;
3034 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
3035 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
3036 break;
3037 case PKT_CTRL_CMD_TEARDOWN:
3038 if (!capable(CAP_SYS_ADMIN))
3039 return -EPERM;
3040 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
3041 break;
3042 case PKT_CTRL_CMD_STATUS:
3043 pkt_get_status(&ctrl_cmd);
3044 break;
3045 default:
3046 return -ENOTTY;
3047 }
3048
3049 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
3050 return -EFAULT;
3051 return ret;
3052 }
3053
3054
3055 static const struct file_operations pkt_ctl_fops = {
3056 .ioctl = pkt_ctl_ioctl,
3057 .owner = THIS_MODULE,
3058 };
3059
3060 static struct miscdevice pkt_misc = {
3061 .minor = MISC_DYNAMIC_MINOR,
3062 .name = DRIVER_NAME,
3063 .fops = &pkt_ctl_fops
3064 };
3065
3066 static int __init pkt_init(void)
3067 {
3068 int ret;
3069
3070 mutex_init(&ctl_mutex);
3071
3072 psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
3073 sizeof(struct packet_stacked_data));
3074 if (!psd_pool)
3075 return -ENOMEM;
3076
3077 ret = register_blkdev(pktdev_major, DRIVER_NAME);
3078 if (ret < 0) {
3079 printk(DRIVER_NAME": Unable to register block device\n");
3080 goto out2;
3081 }
3082 if (!pktdev_major)
3083 pktdev_major = ret;
3084
3085 ret = pkt_sysfs_init();
3086 if (ret)
3087 goto out;
3088
3089 pkt_debugfs_init();
3090
3091 ret = misc_register(&pkt_misc);
3092 if (ret) {
3093 printk(DRIVER_NAME": Unable to register misc device\n");
3094 goto out_misc;
3095 }
3096
3097 pkt_proc = proc_mkdir(DRIVER_NAME, proc_root_driver);
3098
3099 return 0;
3100
3101 out_misc:
3102 pkt_debugfs_cleanup();
3103 pkt_sysfs_cleanup();
3104 out:
3105 unregister_blkdev(pktdev_major, DRIVER_NAME);
3106 out2:
3107 mempool_destroy(psd_pool);
3108 return ret;
3109 }
3110
3111 static void __exit pkt_exit(void)
3112 {
3113 remove_proc_entry(DRIVER_NAME, proc_root_driver);
3114 misc_deregister(&pkt_misc);
3115
3116 pkt_debugfs_cleanup();
3117 pkt_sysfs_cleanup();
3118
3119 unregister_blkdev(pktdev_major, DRIVER_NAME);
3120 mempool_destroy(psd_pool);
3121 }
3122
3123 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3124 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3125 MODULE_LICENSE("GPL");
3126
3127 module_init(pkt_init);
3128 module_exit(pkt_exit);
Linux with added FPC-III support