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kasan: stop tests being eliminated as dead code with FORTIFY_SOURCE
[linux/fpc-iii.git] / drivers / block / pktcdvd.c
blob0b944ac96d6b26e4b3d07d732db977054d7f2ba6
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48
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 <linux/backing-dev.h>
65 #include <scsi/scsi_cmnd.h>
66 #include <scsi/scsi_ioctl.h>
67 #include <scsi/scsi.h>
68 #include <linux/debugfs.h>
69 #include <linux/device.h>
70 #include <linux/nospec.h>
71 #include <linux/uaccess.h>
72
73 #define DRIVER_NAME "pktcdvd"
74
75 #define pkt_err(pd, fmt, ...) \
76 pr_err("%s: " fmt, pd->name, ##__VA_ARGS__)
77 #define pkt_notice(pd, fmt, ...) \
78 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__)
79 #define pkt_info(pd, fmt, ...) \
80 pr_info("%s: " fmt, pd->name, ##__VA_ARGS__)
81
82 #define pkt_dbg(level, pd, fmt, ...) \
83 do { \
84 if (level == 2 && PACKET_DEBUG >= 2) \
85 pr_notice("%s: %s():" fmt, \
86 pd->name, __func__, ##__VA_ARGS__); \
87 else if (level == 1 && PACKET_DEBUG >= 1) \
88 pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \
89 } while (0)
90
91 #define MAX_SPEED 0xffff
92
93 static DEFINE_MUTEX(pktcdvd_mutex);
94 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
95 static struct proc_dir_entry *pkt_proc;
96 static int pktdev_major;
97 static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
98 static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
99 static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
100 static mempool_t psd_pool;
101 static struct bio_set pkt_bio_set;
102
103 static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
104 static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
105
106 /* forward declaration */
107 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
108 static int pkt_remove_dev(dev_t pkt_dev);
109 static int pkt_seq_show(struct seq_file *m, void *p);
110
111 static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd)
112 {
113 return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1);
114 }
115
116 /*
117 * create and register a pktcdvd kernel object.
118 */
119 static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
120 const char* name,
121 struct kobject* parent,
122 struct kobj_type* ktype)
123 {
124 struct pktcdvd_kobj *p;
125 int error;
126
127 p = kzalloc(sizeof(*p), GFP_KERNEL);
128 if (!p)
129 return NULL;
130 p->pd = pd;
131 error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
132 if (error) {
133 kobject_put(&p->kobj);
134 return NULL;
135 }
136 kobject_uevent(&p->kobj, KOBJ_ADD);
137 return p;
138 }
139 /*
140 * remove a pktcdvd kernel object.
141 */
142 static void pkt_kobj_remove(struct pktcdvd_kobj *p)
143 {
144 if (p)
145 kobject_put(&p->kobj);
146 }
147 /*
148 * default release function for pktcdvd kernel objects.
149 */
150 static void pkt_kobj_release(struct kobject *kobj)
151 {
152 kfree(to_pktcdvdkobj(kobj));
153 }
154
155
156 /**********************************************************
157 *
158 * sysfs interface for pktcdvd
159 * by (C) 2006 Thomas Maier <balagi@justmail.de>
160 *
161 **********************************************************/
162
163 #define DEF_ATTR(_obj,_name,_mode) \
164 static struct attribute _obj = { .name = _name, .mode = _mode }
165
166 /**********************************************************
167 /sys/class/pktcdvd/pktcdvd[0-7]/
168 stat/reset
169 stat/packets_started
170 stat/packets_finished
171 stat/kb_written
172 stat/kb_read
173 stat/kb_read_gather
174 write_queue/size
175 write_queue/congestion_off
176 write_queue/congestion_on
177 **********************************************************/
178
179 DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
180 DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
181 DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
182 DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
183 DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
184 DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
185
186 static struct attribute *kobj_pkt_attrs_stat[] = {
187 &kobj_pkt_attr_st1,
188 &kobj_pkt_attr_st2,
189 &kobj_pkt_attr_st3,
190 &kobj_pkt_attr_st4,
191 &kobj_pkt_attr_st5,
192 &kobj_pkt_attr_st6,
193 NULL
194 };
195
196 DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
197 DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
198 DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
199
200 static struct attribute *kobj_pkt_attrs_wqueue[] = {
201 &kobj_pkt_attr_wq1,
202 &kobj_pkt_attr_wq2,
203 &kobj_pkt_attr_wq3,
204 NULL
205 };
206
207 static ssize_t kobj_pkt_show(struct kobject *kobj,
208 struct attribute *attr, char *data)
209 {
210 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
211 int n = 0;
212 int v;
213 if (strcmp(attr->name, "packets_started") == 0) {
214 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
215
216 } else if (strcmp(attr->name, "packets_finished") == 0) {
217 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
218
219 } else if (strcmp(attr->name, "kb_written") == 0) {
220 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
221
222 } else if (strcmp(attr->name, "kb_read") == 0) {
223 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
224
225 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
226 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
227
228 } else if (strcmp(attr->name, "size") == 0) {
229 spin_lock(&pd->lock);
230 v = pd->bio_queue_size;
231 spin_unlock(&pd->lock);
232 n = sprintf(data, "%d\n", v);
233
234 } else if (strcmp(attr->name, "congestion_off") == 0) {
235 spin_lock(&pd->lock);
236 v = pd->write_congestion_off;
237 spin_unlock(&pd->lock);
238 n = sprintf(data, "%d\n", v);
239
240 } else if (strcmp(attr->name, "congestion_on") == 0) {
241 spin_lock(&pd->lock);
242 v = pd->write_congestion_on;
243 spin_unlock(&pd->lock);
244 n = sprintf(data, "%d\n", v);
245 }
246 return n;
247 }
248
249 static void init_write_congestion_marks(int* lo, int* hi)
250 {
251 if (*hi > 0) {
252 *hi = max(*hi, 500);
253 *hi = min(*hi, 1000000);
254 if (*lo <= 0)
255 *lo = *hi - 100;
256 else {
257 *lo = min(*lo, *hi - 100);
258 *lo = max(*lo, 100);
259 }
260 } else {
261 *hi = -1;
262 *lo = -1;
263 }
264 }
265
266 static ssize_t kobj_pkt_store(struct kobject *kobj,
267 struct attribute *attr,
268 const char *data, size_t len)
269 {
270 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
271 int val;
272
273 if (strcmp(attr->name, "reset") == 0 && len > 0) {
274 pd->stats.pkt_started = 0;
275 pd->stats.pkt_ended = 0;
276 pd->stats.secs_w = 0;
277 pd->stats.secs_rg = 0;
278 pd->stats.secs_r = 0;
279
280 } else if (strcmp(attr->name, "congestion_off") == 0
281 && sscanf(data, "%d", &val) == 1) {
282 spin_lock(&pd->lock);
283 pd->write_congestion_off = val;
284 init_write_congestion_marks(&pd->write_congestion_off,
285 &pd->write_congestion_on);
286 spin_unlock(&pd->lock);
287
288 } else if (strcmp(attr->name, "congestion_on") == 0
289 && sscanf(data, "%d", &val) == 1) {
290 spin_lock(&pd->lock);
291 pd->write_congestion_on = val;
292 init_write_congestion_marks(&pd->write_congestion_off,
293 &pd->write_congestion_on);
294 spin_unlock(&pd->lock);
295 }
296 return len;
297 }
298
299 static const struct sysfs_ops kobj_pkt_ops = {
300 .show = kobj_pkt_show,
301 .store = kobj_pkt_store
302 };
303 static struct kobj_type kobj_pkt_type_stat = {
304 .release = pkt_kobj_release,
305 .sysfs_ops = &kobj_pkt_ops,
306 .default_attrs = kobj_pkt_attrs_stat
307 };
308 static struct kobj_type kobj_pkt_type_wqueue = {
309 .release = pkt_kobj_release,
310 .sysfs_ops = &kobj_pkt_ops,
311 .default_attrs = kobj_pkt_attrs_wqueue
312 };
313
314 static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
315 {
316 if (class_pktcdvd) {
317 pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL,
318 "%s", pd->name);
319 if (IS_ERR(pd->dev))
320 pd->dev = NULL;
321 }
322 if (pd->dev) {
323 pd->kobj_stat = pkt_kobj_create(pd, "stat",
324 &pd->dev->kobj,
325 &kobj_pkt_type_stat);
326 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
327 &pd->dev->kobj,
328 &kobj_pkt_type_wqueue);
329 }
330 }
331
332 static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
333 {
334 pkt_kobj_remove(pd->kobj_stat);
335 pkt_kobj_remove(pd->kobj_wqueue);
336 if (class_pktcdvd)
337 device_unregister(pd->dev);
338 }
339
340
341 /********************************************************************
342 /sys/class/pktcdvd/
343 add map block device
344 remove unmap packet dev
345 device_map show mappings
346 *******************************************************************/
347
348 static void class_pktcdvd_release(struct class *cls)
349 {
350 kfree(cls);
351 }
352
353 static ssize_t device_map_show(struct class *c, struct class_attribute *attr,
354 char *data)
355 {
356 int n = 0;
357 int idx;
358 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
359 for (idx = 0; idx < MAX_WRITERS; idx++) {
360 struct pktcdvd_device *pd = pkt_devs[idx];
361 if (!pd)
362 continue;
363 n += sprintf(data+n, "%s %u:%u %u:%u\n",
364 pd->name,
365 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
366 MAJOR(pd->bdev->bd_dev),
367 MINOR(pd->bdev->bd_dev));
368 }
369 mutex_unlock(&ctl_mutex);
370 return n;
371 }
372 static CLASS_ATTR_RO(device_map);
373
374 static ssize_t add_store(struct class *c, struct class_attribute *attr,
375 const char *buf, size_t count)
376 {
377 unsigned int major, minor;
378
379 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
380 /* pkt_setup_dev() expects caller to hold reference to self */
381 if (!try_module_get(THIS_MODULE))
382 return -ENODEV;
383
384 pkt_setup_dev(MKDEV(major, minor), NULL);
385
386 module_put(THIS_MODULE);
387
388 return count;
389 }
390
391 return -EINVAL;
392 }
393 static CLASS_ATTR_WO(add);
394
395 static ssize_t remove_store(struct class *c, struct class_attribute *attr,
396 const char *buf, size_t count)
397 {
398 unsigned int major, minor;
399 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
400 pkt_remove_dev(MKDEV(major, minor));
401 return count;
402 }
403 return -EINVAL;
404 }
405 static CLASS_ATTR_WO(remove);
406
407 static struct attribute *class_pktcdvd_attrs[] = {
408 &class_attr_add.attr,
409 &class_attr_remove.attr,
410 &class_attr_device_map.attr,
411 NULL,
412 };
413 ATTRIBUTE_GROUPS(class_pktcdvd);
414
415 static int pkt_sysfs_init(void)
416 {
417 int ret = 0;
418
419 /*
420 * create control files in sysfs
421 * /sys/class/pktcdvd/...
422 */
423 class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
424 if (!class_pktcdvd)
425 return -ENOMEM;
426 class_pktcdvd->name = DRIVER_NAME;
427 class_pktcdvd->owner = THIS_MODULE;
428 class_pktcdvd->class_release = class_pktcdvd_release;
429 class_pktcdvd->class_groups = class_pktcdvd_groups;
430 ret = class_register(class_pktcdvd);
431 if (ret) {
432 kfree(class_pktcdvd);
433 class_pktcdvd = NULL;
434 pr_err("failed to create class pktcdvd\n");
435 return ret;
436 }
437 return 0;
438 }
439
440 static void pkt_sysfs_cleanup(void)
441 {
442 if (class_pktcdvd)
443 class_destroy(class_pktcdvd);
444 class_pktcdvd = NULL;
445 }
446
447 /********************************************************************
448 entries in debugfs
449
450 /sys/kernel/debug/pktcdvd[0-7]/
451 info
452
453 *******************************************************************/
454
455 static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
456 {
457 return pkt_seq_show(m, p);
458 }
459
460 static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
461 {
462 return single_open(file, pkt_debugfs_seq_show, inode->i_private);
463 }
464
465 static const struct file_operations debug_fops = {
466 .open = pkt_debugfs_fops_open,
467 .read = seq_read,
468 .llseek = seq_lseek,
469 .release = single_release,
470 .owner = THIS_MODULE,
471 };
472
473 static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
474 {
475 if (!pkt_debugfs_root)
476 return;
477 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
478 if (!pd->dfs_d_root)
479 return;
480
481 pd->dfs_f_info = debugfs_create_file("info", 0444,
482 pd->dfs_d_root, pd, &debug_fops);
483 }
484
485 static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
486 {
487 if (!pkt_debugfs_root)
488 return;
489 debugfs_remove(pd->dfs_f_info);
490 debugfs_remove(pd->dfs_d_root);
491 pd->dfs_f_info = NULL;
492 pd->dfs_d_root = NULL;
493 }
494
495 static void pkt_debugfs_init(void)
496 {
497 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
498 }
499
500 static void pkt_debugfs_cleanup(void)
501 {
502 debugfs_remove(pkt_debugfs_root);
503 pkt_debugfs_root = NULL;
504 }
505
506 /* ----------------------------------------------------------*/
507
508
509 static void pkt_bio_finished(struct pktcdvd_device *pd)
510 {
511 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
512 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
513 pkt_dbg(2, pd, "queue empty\n");
514 atomic_set(&pd->iosched.attention, 1);
515 wake_up(&pd->wqueue);
516 }
517 }
518
519 /*
520 * Allocate a packet_data struct
521 */
522 static struct packet_data *pkt_alloc_packet_data(int frames)
523 {
524 int i;
525 struct packet_data *pkt;
526
527 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
528 if (!pkt)
529 goto no_pkt;
530
531 pkt->frames = frames;
532 pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
533 if (!pkt->w_bio)
534 goto no_bio;
535
536 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
537 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
538 if (!pkt->pages[i])
539 goto no_page;
540 }
541
542 spin_lock_init(&pkt->lock);
543 bio_list_init(&pkt->orig_bios);
544
545 for (i = 0; i < frames; i++) {
546 struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
547 if (!bio)
548 goto no_rd_bio;
549
550 pkt->r_bios[i] = bio;
551 }
552
553 return pkt;
554
555 no_rd_bio:
556 for (i = 0; i < frames; i++) {
557 struct bio *bio = pkt->r_bios[i];
558 if (bio)
559 bio_put(bio);
560 }
561
562 no_page:
563 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
564 if (pkt->pages[i])
565 __free_page(pkt->pages[i]);
566 bio_put(pkt->w_bio);
567 no_bio:
568 kfree(pkt);
569 no_pkt:
570 return NULL;
571 }
572
573 /*
574 * Free a packet_data struct
575 */
576 static void pkt_free_packet_data(struct packet_data *pkt)
577 {
578 int i;
579
580 for (i = 0; i < pkt->frames; i++) {
581 struct bio *bio = pkt->r_bios[i];
582 if (bio)
583 bio_put(bio);
584 }
585 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
586 __free_page(pkt->pages[i]);
587 bio_put(pkt->w_bio);
588 kfree(pkt);
589 }
590
591 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
592 {
593 struct packet_data *pkt, *next;
594
595 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
596
597 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
598 pkt_free_packet_data(pkt);
599 }
600 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
601 }
602
603 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
604 {
605 struct packet_data *pkt;
606
607 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
608
609 while (nr_packets > 0) {
610 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
611 if (!pkt) {
612 pkt_shrink_pktlist(pd);
613 return 0;
614 }
615 pkt->id = nr_packets;
616 pkt->pd = pd;
617 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
618 nr_packets--;
619 }
620 return 1;
621 }
622
623 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
624 {
625 struct rb_node *n = rb_next(&node->rb_node);
626 if (!n)
627 return NULL;
628 return rb_entry(n, struct pkt_rb_node, rb_node);
629 }
630
631 static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
632 {
633 rb_erase(&node->rb_node, &pd->bio_queue);
634 mempool_free(node, &pd->rb_pool);
635 pd->bio_queue_size--;
636 BUG_ON(pd->bio_queue_size < 0);
637 }
638
639 /*
640 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
641 */
642 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
643 {
644 struct rb_node *n = pd->bio_queue.rb_node;
645 struct rb_node *next;
646 struct pkt_rb_node *tmp;
647
648 if (!n) {
649 BUG_ON(pd->bio_queue_size > 0);
650 return NULL;
651 }
652
653 for (;;) {
654 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
655 if (s <= tmp->bio->bi_iter.bi_sector)
656 next = n->rb_left;
657 else
658 next = n->rb_right;
659 if (!next)
660 break;
661 n = next;
662 }
663
664 if (s > tmp->bio->bi_iter.bi_sector) {
665 tmp = pkt_rbtree_next(tmp);
666 if (!tmp)
667 return NULL;
668 }
669 BUG_ON(s > tmp->bio->bi_iter.bi_sector);
670 return tmp;
671 }
672
673 /*
674 * Insert a node into the pd->bio_queue rb tree.
675 */
676 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
677 {
678 struct rb_node **p = &pd->bio_queue.rb_node;
679 struct rb_node *parent = NULL;
680 sector_t s = node->bio->bi_iter.bi_sector;
681 struct pkt_rb_node *tmp;
682
683 while (*p) {
684 parent = *p;
685 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
686 if (s < tmp->bio->bi_iter.bi_sector)
687 p = &(*p)->rb_left;
688 else
689 p = &(*p)->rb_right;
690 }
691 rb_link_node(&node->rb_node, parent, p);
692 rb_insert_color(&node->rb_node, &pd->bio_queue);
693 pd->bio_queue_size++;
694 }
695
696 /*
697 * Send a packet_command to the underlying block device and
698 * wait for completion.
699 */
700 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
701 {
702 struct request_queue *q = bdev_get_queue(pd->bdev);
703 struct request *rq;
704 int ret = 0;
705
706 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
707 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
708 if (IS_ERR(rq))
709 return PTR_ERR(rq);
710
711 if (cgc->buflen) {
712 ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen,
713 GFP_NOIO);
714 if (ret)
715 goto out;
716 }
717
718 scsi_req(rq)->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
719 memcpy(scsi_req(rq)->cmd, cgc->cmd, CDROM_PACKET_SIZE);
720
721 rq->timeout = 60*HZ;
722 if (cgc->quiet)
723 rq->rq_flags |= RQF_QUIET;
724
725 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
726 if (scsi_req(rq)->result)
727 ret = -EIO;
728 out:
729 blk_put_request(rq);
730 return ret;
731 }
732
733 static const char *sense_key_string(__u8 index)
734 {
735 static const char * const info[] = {
736 "No sense", "Recovered error", "Not ready",
737 "Medium error", "Hardware error", "Illegal request",
738 "Unit attention", "Data protect", "Blank check",
739 };
740
741 return index < ARRAY_SIZE(info) ? info[index] : "INVALID";
742 }
743
744 /*
745 * A generic sense dump / resolve mechanism should be implemented across
746 * all ATAPI + SCSI devices.
747 */
748 static void pkt_dump_sense(struct pktcdvd_device *pd,
749 struct packet_command *cgc)
750 {
751 struct scsi_sense_hdr *sshdr = cgc->sshdr;
752
753 if (sshdr)
754 pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n",
755 CDROM_PACKET_SIZE, cgc->cmd,
756 sshdr->sense_key, sshdr->asc, sshdr->ascq,
757 sense_key_string(sshdr->sense_key));
758 else
759 pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd);
760 }
761
762 /*
763 * flush the drive cache to media
764 */
765 static int pkt_flush_cache(struct pktcdvd_device *pd)
766 {
767 struct packet_command cgc;
768
769 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
770 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
771 cgc.quiet = 1;
772
773 /*
774 * the IMMED bit -- we default to not setting it, although that
775 * would allow a much faster close, this is safer
776 */
777 #if 0
778 cgc.cmd[1] = 1 << 1;
779 #endif
780 return pkt_generic_packet(pd, &cgc);
781 }
782
783 /*
784 * speed is given as the normal factor, e.g. 4 for 4x
785 */
786 static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
787 unsigned write_speed, unsigned read_speed)
788 {
789 struct packet_command cgc;
790 struct scsi_sense_hdr sshdr;
791 int ret;
792
793 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
794 cgc.sshdr = &sshdr;
795 cgc.cmd[0] = GPCMD_SET_SPEED;
796 cgc.cmd[2] = (read_speed >> 8) & 0xff;
797 cgc.cmd[3] = read_speed & 0xff;
798 cgc.cmd[4] = (write_speed >> 8) & 0xff;
799 cgc.cmd[5] = write_speed & 0xff;
800
801 ret = pkt_generic_packet(pd, &cgc);
802 if (ret)
803 pkt_dump_sense(pd, &cgc);
804
805 return ret;
806 }
807
808 /*
809 * Queue a bio for processing by the low-level CD device. Must be called
810 * from process context.
811 */
812 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
813 {
814 spin_lock(&pd->iosched.lock);
815 if (bio_data_dir(bio) == READ)
816 bio_list_add(&pd->iosched.read_queue, bio);
817 else
818 bio_list_add(&pd->iosched.write_queue, bio);
819 spin_unlock(&pd->iosched.lock);
820
821 atomic_set(&pd->iosched.attention, 1);
822 wake_up(&pd->wqueue);
823 }
824
825 /*
826 * Process the queued read/write requests. This function handles special
827 * requirements for CDRW drives:
828 * - A cache flush command must be inserted before a read request if the
829 * previous request was a write.
830 * - Switching between reading and writing is slow, so don't do it more often
831 * than necessary.
832 * - Optimize for throughput at the expense of latency. This means that streaming
833 * writes will never be interrupted by a read, but if the drive has to seek
834 * before the next write, switch to reading instead if there are any pending
835 * read requests.
836 * - Set the read speed according to current usage pattern. When only reading
837 * from the device, it's best to use the highest possible read speed, but
838 * when switching often between reading and writing, it's better to have the
839 * same read and write speeds.
840 */
841 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
842 {
843
844 if (atomic_read(&pd->iosched.attention) == 0)
845 return;
846 atomic_set(&pd->iosched.attention, 0);
847
848 for (;;) {
849 struct bio *bio;
850 int reads_queued, writes_queued;
851
852 spin_lock(&pd->iosched.lock);
853 reads_queued = !bio_list_empty(&pd->iosched.read_queue);
854 writes_queued = !bio_list_empty(&pd->iosched.write_queue);
855 spin_unlock(&pd->iosched.lock);
856
857 if (!reads_queued && !writes_queued)
858 break;
859
860 if (pd->iosched.writing) {
861 int need_write_seek = 1;
862 spin_lock(&pd->iosched.lock);
863 bio = bio_list_peek(&pd->iosched.write_queue);
864 spin_unlock(&pd->iosched.lock);
865 if (bio && (bio->bi_iter.bi_sector ==
866 pd->iosched.last_write))
867 need_write_seek = 0;
868 if (need_write_seek && reads_queued) {
869 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
870 pkt_dbg(2, pd, "write, waiting\n");
871 break;
872 }
873 pkt_flush_cache(pd);
874 pd->iosched.writing = 0;
875 }
876 } else {
877 if (!reads_queued && writes_queued) {
878 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
879 pkt_dbg(2, pd, "read, waiting\n");
880 break;
881 }
882 pd->iosched.writing = 1;
883 }
884 }
885
886 spin_lock(&pd->iosched.lock);
887 if (pd->iosched.writing)
888 bio = bio_list_pop(&pd->iosched.write_queue);
889 else
890 bio = bio_list_pop(&pd->iosched.read_queue);
891 spin_unlock(&pd->iosched.lock);
892
893 if (!bio)
894 continue;
895
896 if (bio_data_dir(bio) == READ)
897 pd->iosched.successive_reads +=
898 bio->bi_iter.bi_size >> 10;
899 else {
900 pd->iosched.successive_reads = 0;
901 pd->iosched.last_write = bio_end_sector(bio);
902 }
903 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
904 if (pd->read_speed == pd->write_speed) {
905 pd->read_speed = MAX_SPEED;
906 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
907 }
908 } else {
909 if (pd->read_speed != pd->write_speed) {
910 pd->read_speed = pd->write_speed;
911 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
912 }
913 }
914
915 atomic_inc(&pd->cdrw.pending_bios);
916 generic_make_request(bio);
917 }
918 }
919
920 /*
921 * Special care is needed if the underlying block device has a small
922 * max_phys_segments value.
923 */
924 static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
925 {
926 if ((pd->settings.size << 9) / CD_FRAMESIZE
927 <= queue_max_segments(q)) {
928 /*
929 * The cdrom device can handle one segment/frame
930 */
931 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
932 return 0;
933 } else if ((pd->settings.size << 9) / PAGE_SIZE
934 <= queue_max_segments(q)) {
935 /*
936 * We can handle this case at the expense of some extra memory
937 * copies during write operations
938 */
939 set_bit(PACKET_MERGE_SEGS, &pd->flags);
940 return 0;
941 } else {
942 pkt_err(pd, "cdrom max_phys_segments too small\n");
943 return -EIO;
944 }
945 }
946
947 static void pkt_end_io_read(struct bio *bio)
948 {
949 struct packet_data *pkt = bio->bi_private;
950 struct pktcdvd_device *pd = pkt->pd;
951 BUG_ON(!pd);
952
953 pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n",
954 bio, (unsigned long long)pkt->sector,
955 (unsigned long long)bio->bi_iter.bi_sector, bio->bi_status);
956
957 if (bio->bi_status)
958 atomic_inc(&pkt->io_errors);
959 if (atomic_dec_and_test(&pkt->io_wait)) {
960 atomic_inc(&pkt->run_sm);
961 wake_up(&pd->wqueue);
962 }
963 pkt_bio_finished(pd);
964 }
965
966 static void pkt_end_io_packet_write(struct bio *bio)
967 {
968 struct packet_data *pkt = bio->bi_private;
969 struct pktcdvd_device *pd = pkt->pd;
970 BUG_ON(!pd);
971
972 pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status);
973
974 pd->stats.pkt_ended++;
975
976 pkt_bio_finished(pd);
977 atomic_dec(&pkt->io_wait);
978 atomic_inc(&pkt->run_sm);
979 wake_up(&pd->wqueue);
980 }
981
982 /*
983 * Schedule reads for the holes in a packet
984 */
985 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
986 {
987 int frames_read = 0;
988 struct bio *bio;
989 int f;
990 char written[PACKET_MAX_SIZE];
991
992 BUG_ON(bio_list_empty(&pkt->orig_bios));
993
994 atomic_set(&pkt->io_wait, 0);
995 atomic_set(&pkt->io_errors, 0);
996
997 /*
998 * Figure out which frames we need to read before we can write.
999 */
1000 memset(written, 0, sizeof(written));
1001 spin_lock(&pkt->lock);
1002 bio_list_for_each(bio, &pkt->orig_bios) {
1003 int first_frame = (bio->bi_iter.bi_sector - pkt->sector) /
1004 (CD_FRAMESIZE >> 9);
1005 int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE;
1006 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
1007 BUG_ON(first_frame < 0);
1008 BUG_ON(first_frame + num_frames > pkt->frames);
1009 for (f = first_frame; f < first_frame + num_frames; f++)
1010 written[f] = 1;
1011 }
1012 spin_unlock(&pkt->lock);
1013
1014 if (pkt->cache_valid) {
1015 pkt_dbg(2, pd, "zone %llx cached\n",
1016 (unsigned long long)pkt->sector);
1017 goto out_account;
1018 }
1019
1020 /*
1021 * Schedule reads for missing parts of the packet.
1022 */
1023 for (f = 0; f < pkt->frames; f++) {
1024 int p, offset;
1025
1026 if (written[f])
1027 continue;
1028
1029 bio = pkt->r_bios[f];
1030 bio_reset(bio);
1031 bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1032 bio_set_dev(bio, pd->bdev);
1033 bio->bi_end_io = pkt_end_io_read;
1034 bio->bi_private = pkt;
1035
1036 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1037 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1038 pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n",
1039 f, pkt->pages[p], offset);
1040 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1041 BUG();
1042
1043 atomic_inc(&pkt->io_wait);
1044 bio_set_op_attrs(bio, REQ_OP_READ, 0);
1045 pkt_queue_bio(pd, bio);
1046 frames_read++;
1047 }
1048
1049 out_account:
1050 pkt_dbg(2, pd, "need %d frames for zone %llx\n",
1051 frames_read, (unsigned long long)pkt->sector);
1052 pd->stats.pkt_started++;
1053 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
1054 }
1055
1056 /*
1057 * Find a packet matching zone, or the least recently used packet if
1058 * there is no match.
1059 */
1060 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1061 {
1062 struct packet_data *pkt;
1063
1064 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1065 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1066 list_del_init(&pkt->list);
1067 if (pkt->sector != zone)
1068 pkt->cache_valid = 0;
1069 return pkt;
1070 }
1071 }
1072 BUG();
1073 return NULL;
1074 }
1075
1076 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1077 {
1078 if (pkt->cache_valid) {
1079 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1080 } else {
1081 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1082 }
1083 }
1084
1085 /*
1086 * recover a failed write, query for relocation if possible
1087 *
1088 * returns 1 if recovery is possible, or 0 if not
1089 *
1090 */
1091 static int pkt_start_recovery(struct packet_data *pkt)
1092 {
1093 /*
1094 * FIXME. We need help from the file system to implement
1095 * recovery handling.
1096 */
1097 return 0;
1098 #if 0
1099 struct request *rq = pkt->rq;
1100 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1101 struct block_device *pkt_bdev;
1102 struct super_block *sb = NULL;
1103 unsigned long old_block, new_block;
1104 sector_t new_sector;
1105
1106 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1107 if (pkt_bdev) {
1108 sb = get_super(pkt_bdev);
1109 bdput(pkt_bdev);
1110 }
1111
1112 if (!sb)
1113 return 0;
1114
1115 if (!sb->s_op->relocate_blocks)
1116 goto out;
1117
1118 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1119 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1120 goto out;
1121
1122 new_sector = new_block * (CD_FRAMESIZE >> 9);
1123 pkt->sector = new_sector;
1124
1125 bio_reset(pkt->bio);
1126 bio_set_dev(pkt->bio, pd->bdev);
1127 bio_set_op_attrs(pkt->bio, REQ_OP_WRITE, 0);
1128 pkt->bio->bi_iter.bi_sector = new_sector;
1129 pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE;
1130 pkt->bio->bi_vcnt = pkt->frames;
1131
1132 pkt->bio->bi_end_io = pkt_end_io_packet_write;
1133 pkt->bio->bi_private = pkt;
1134
1135 drop_super(sb);
1136 return 1;
1137
1138 out:
1139 drop_super(sb);
1140 return 0;
1141 #endif
1142 }
1143
1144 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1145 {
1146 #if PACKET_DEBUG > 1
1147 static const char *state_name[] = {
1148 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1149 };
1150 enum packet_data_state old_state = pkt->state;
1151 pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n",
1152 pkt->id, (unsigned long long)pkt->sector,
1153 state_name[old_state], state_name[state]);
1154 #endif
1155 pkt->state = state;
1156 }
1157
1158 /*
1159 * Scan the work queue to see if we can start a new packet.
1160 * returns non-zero if any work was done.
1161 */
1162 static int pkt_handle_queue(struct pktcdvd_device *pd)
1163 {
1164 struct packet_data *pkt, *p;
1165 struct bio *bio = NULL;
1166 sector_t zone = 0; /* Suppress gcc warning */
1167 struct pkt_rb_node *node, *first_node;
1168 struct rb_node *n;
1169 int wakeup;
1170
1171 atomic_set(&pd->scan_queue, 0);
1172
1173 if (list_empty(&pd->cdrw.pkt_free_list)) {
1174 pkt_dbg(2, pd, "no pkt\n");
1175 return 0;
1176 }
1177
1178 /*
1179 * Try to find a zone we are not already working on.
1180 */
1181 spin_lock(&pd->lock);
1182 first_node = pkt_rbtree_find(pd, pd->current_sector);
1183 if (!first_node) {
1184 n = rb_first(&pd->bio_queue);
1185 if (n)
1186 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1187 }
1188 node = first_node;
1189 while (node) {
1190 bio = node->bio;
1191 zone = get_zone(bio->bi_iter.bi_sector, pd);
1192 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1193 if (p->sector == zone) {
1194 bio = NULL;
1195 goto try_next_bio;
1196 }
1197 }
1198 break;
1199 try_next_bio:
1200 node = pkt_rbtree_next(node);
1201 if (!node) {
1202 n = rb_first(&pd->bio_queue);
1203 if (n)
1204 node = rb_entry(n, struct pkt_rb_node, rb_node);
1205 }
1206 if (node == first_node)
1207 node = NULL;
1208 }
1209 spin_unlock(&pd->lock);
1210 if (!bio) {
1211 pkt_dbg(2, pd, "no bio\n");
1212 return 0;
1213 }
1214
1215 pkt = pkt_get_packet_data(pd, zone);
1216
1217 pd->current_sector = zone + pd->settings.size;
1218 pkt->sector = zone;
1219 BUG_ON(pkt->frames != pd->settings.size >> 2);
1220 pkt->write_size = 0;
1221
1222 /*
1223 * Scan work queue for bios in the same zone and link them
1224 * to this packet.
1225 */
1226 spin_lock(&pd->lock);
1227 pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone);
1228 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1229 bio = node->bio;
1230 pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long)
1231 get_zone(bio->bi_iter.bi_sector, pd));
1232 if (get_zone(bio->bi_iter.bi_sector, pd) != zone)
1233 break;
1234 pkt_rbtree_erase(pd, node);
1235 spin_lock(&pkt->lock);
1236 bio_list_add(&pkt->orig_bios, bio);
1237 pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE;
1238 spin_unlock(&pkt->lock);
1239 }
1240 /* check write congestion marks, and if bio_queue_size is
1241 below, wake up any waiters */
1242 wakeup = (pd->write_congestion_on > 0
1243 && pd->bio_queue_size <= pd->write_congestion_off);
1244 spin_unlock(&pd->lock);
1245 if (wakeup) {
1246 clear_bdi_congested(pd->disk->queue->backing_dev_info,
1247 BLK_RW_ASYNC);
1248 }
1249
1250 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1251 pkt_set_state(pkt, PACKET_WAITING_STATE);
1252 atomic_set(&pkt->run_sm, 1);
1253
1254 spin_lock(&pd->cdrw.active_list_lock);
1255 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1256 spin_unlock(&pd->cdrw.active_list_lock);
1257
1258 return 1;
1259 }
1260
1261 /*
1262 * Assemble a bio to write one packet and queue the bio for processing
1263 * by the underlying block device.
1264 */
1265 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1266 {
1267 int f;
1268
1269 bio_reset(pkt->w_bio);
1270 pkt->w_bio->bi_iter.bi_sector = pkt->sector;
1271 bio_set_dev(pkt->w_bio, pd->bdev);
1272 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1273 pkt->w_bio->bi_private = pkt;
1274
1275 /* XXX: locking? */
1276 for (f = 0; f < pkt->frames; f++) {
1277 struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1278 unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1279
1280 if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset))
1281 BUG();
1282 }
1283 pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt);
1284
1285 /*
1286 * Fill-in bvec with data from orig_bios.
1287 */
1288 spin_lock(&pkt->lock);
1289 bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head);
1290
1291 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1292 spin_unlock(&pkt->lock);
1293
1294 pkt_dbg(2, pd, "Writing %d frames for zone %llx\n",
1295 pkt->write_size, (unsigned long long)pkt->sector);
1296
1297 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames))
1298 pkt->cache_valid = 1;
1299 else
1300 pkt->cache_valid = 0;
1301
1302 /* Start the write request */
1303 atomic_set(&pkt->io_wait, 1);
1304 bio_set_op_attrs(pkt->w_bio, REQ_OP_WRITE, 0);
1305 pkt_queue_bio(pd, pkt->w_bio);
1306 }
1307
1308 static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status)
1309 {
1310 struct bio *bio;
1311
1312 if (status)
1313 pkt->cache_valid = 0;
1314
1315 /* Finish all bios corresponding to this packet */
1316 while ((bio = bio_list_pop(&pkt->orig_bios))) {
1317 bio->bi_status = status;
1318 bio_endio(bio);
1319 }
1320 }
1321
1322 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1323 {
1324 pkt_dbg(2, pd, "pkt %d\n", pkt->id);
1325
1326 for (;;) {
1327 switch (pkt->state) {
1328 case PACKET_WAITING_STATE:
1329 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1330 return;
1331
1332 pkt->sleep_time = 0;
1333 pkt_gather_data(pd, pkt);
1334 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1335 break;
1336
1337 case PACKET_READ_WAIT_STATE:
1338 if (atomic_read(&pkt->io_wait) > 0)
1339 return;
1340
1341 if (atomic_read(&pkt->io_errors) > 0) {
1342 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1343 } else {
1344 pkt_start_write(pd, pkt);
1345 }
1346 break;
1347
1348 case PACKET_WRITE_WAIT_STATE:
1349 if (atomic_read(&pkt->io_wait) > 0)
1350 return;
1351
1352 if (!pkt->w_bio->bi_status) {
1353 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1354 } else {
1355 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1356 }
1357 break;
1358
1359 case PACKET_RECOVERY_STATE:
1360 if (pkt_start_recovery(pkt)) {
1361 pkt_start_write(pd, pkt);
1362 } else {
1363 pkt_dbg(2, pd, "No recovery possible\n");
1364 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1365 }
1366 break;
1367
1368 case PACKET_FINISHED_STATE:
1369 pkt_finish_packet(pkt, pkt->w_bio->bi_status);
1370 return;
1371
1372 default:
1373 BUG();
1374 break;
1375 }
1376 }
1377 }
1378
1379 static void pkt_handle_packets(struct pktcdvd_device *pd)
1380 {
1381 struct packet_data *pkt, *next;
1382
1383 /*
1384 * Run state machine for active packets
1385 */
1386 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1387 if (atomic_read(&pkt->run_sm) > 0) {
1388 atomic_set(&pkt->run_sm, 0);
1389 pkt_run_state_machine(pd, pkt);
1390 }
1391 }
1392
1393 /*
1394 * Move no longer active packets to the free list
1395 */
1396 spin_lock(&pd->cdrw.active_list_lock);
1397 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1398 if (pkt->state == PACKET_FINISHED_STATE) {
1399 list_del(&pkt->list);
1400 pkt_put_packet_data(pd, pkt);
1401 pkt_set_state(pkt, PACKET_IDLE_STATE);
1402 atomic_set(&pd->scan_queue, 1);
1403 }
1404 }
1405 spin_unlock(&pd->cdrw.active_list_lock);
1406 }
1407
1408 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1409 {
1410 struct packet_data *pkt;
1411 int i;
1412
1413 for (i = 0; i < PACKET_NUM_STATES; i++)
1414 states[i] = 0;
1415
1416 spin_lock(&pd->cdrw.active_list_lock);
1417 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1418 states[pkt->state]++;
1419 }
1420 spin_unlock(&pd->cdrw.active_list_lock);
1421 }
1422
1423 /*
1424 * kcdrwd is woken up when writes have been queued for one of our
1425 * registered devices
1426 */
1427 static int kcdrwd(void *foobar)
1428 {
1429 struct pktcdvd_device *pd = foobar;
1430 struct packet_data *pkt;
1431 long min_sleep_time, residue;
1432
1433 set_user_nice(current, MIN_NICE);
1434 set_freezable();
1435
1436 for (;;) {
1437 DECLARE_WAITQUEUE(wait, current);
1438
1439 /*
1440 * Wait until there is something to do
1441 */
1442 add_wait_queue(&pd->wqueue, &wait);
1443 for (;;) {
1444 set_current_state(TASK_INTERRUPTIBLE);
1445
1446 /* Check if we need to run pkt_handle_queue */
1447 if (atomic_read(&pd->scan_queue) > 0)
1448 goto work_to_do;
1449
1450 /* Check if we need to run the state machine for some packet */
1451 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1452 if (atomic_read(&pkt->run_sm) > 0)
1453 goto work_to_do;
1454 }
1455
1456 /* Check if we need to process the iosched queues */
1457 if (atomic_read(&pd->iosched.attention) != 0)
1458 goto work_to_do;
1459
1460 /* Otherwise, go to sleep */
1461 if (PACKET_DEBUG > 1) {
1462 int states[PACKET_NUM_STATES];
1463 pkt_count_states(pd, states);
1464 pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1465 states[0], states[1], states[2],
1466 states[3], states[4], states[5]);
1467 }
1468
1469 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1470 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1471 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1472 min_sleep_time = pkt->sleep_time;
1473 }
1474
1475 pkt_dbg(2, pd, "sleeping\n");
1476 residue = schedule_timeout(min_sleep_time);
1477 pkt_dbg(2, pd, "wake up\n");
1478
1479 /* make swsusp happy with our thread */
1480 try_to_freeze();
1481
1482 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1483 if (!pkt->sleep_time)
1484 continue;
1485 pkt->sleep_time -= min_sleep_time - residue;
1486 if (pkt->sleep_time <= 0) {
1487 pkt->sleep_time = 0;
1488 atomic_inc(&pkt->run_sm);
1489 }
1490 }
1491
1492 if (kthread_should_stop())
1493 break;
1494 }
1495 work_to_do:
1496 set_current_state(TASK_RUNNING);
1497 remove_wait_queue(&pd->wqueue, &wait);
1498
1499 if (kthread_should_stop())
1500 break;
1501
1502 /*
1503 * if pkt_handle_queue returns true, we can queue
1504 * another request.
1505 */
1506 while (pkt_handle_queue(pd))
1507 ;
1508
1509 /*
1510 * Handle packet state machine
1511 */
1512 pkt_handle_packets(pd);
1513
1514 /*
1515 * Handle iosched queues
1516 */
1517 pkt_iosched_process_queue(pd);
1518 }
1519
1520 return 0;
1521 }
1522
1523 static void pkt_print_settings(struct pktcdvd_device *pd)
1524 {
1525 pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n",
1526 pd->settings.fp ? "Fixed" : "Variable",
1527 pd->settings.size >> 2,
1528 pd->settings.block_mode == 8 ? '1' : '2');
1529 }
1530
1531 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1532 {
1533 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1534
1535 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1536 cgc->cmd[2] = page_code | (page_control << 6);
1537 cgc->cmd[7] = cgc->buflen >> 8;
1538 cgc->cmd[8] = cgc->buflen & 0xff;
1539 cgc->data_direction = CGC_DATA_READ;
1540 return pkt_generic_packet(pd, cgc);
1541 }
1542
1543 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1544 {
1545 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1546 memset(cgc->buffer, 0, 2);
1547 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1548 cgc->cmd[1] = 0x10; /* PF */
1549 cgc->cmd[7] = cgc->buflen >> 8;
1550 cgc->cmd[8] = cgc->buflen & 0xff;
1551 cgc->data_direction = CGC_DATA_WRITE;
1552 return pkt_generic_packet(pd, cgc);
1553 }
1554
1555 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1556 {
1557 struct packet_command cgc;
1558 int ret;
1559
1560 /* set up command and get the disc info */
1561 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1562 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1563 cgc.cmd[8] = cgc.buflen = 2;
1564 cgc.quiet = 1;
1565
1566 ret = pkt_generic_packet(pd, &cgc);
1567 if (ret)
1568 return ret;
1569
1570 /* not all drives have the same disc_info length, so requeue
1571 * packet with the length the drive tells us it can supply
1572 */
1573 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1574 sizeof(di->disc_information_length);
1575
1576 if (cgc.buflen > sizeof(disc_information))
1577 cgc.buflen = sizeof(disc_information);
1578
1579 cgc.cmd[8] = cgc.buflen;
1580 return pkt_generic_packet(pd, &cgc);
1581 }
1582
1583 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1584 {
1585 struct packet_command cgc;
1586 int ret;
1587
1588 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1589 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1590 cgc.cmd[1] = type & 3;
1591 cgc.cmd[4] = (track & 0xff00) >> 8;
1592 cgc.cmd[5] = track & 0xff;
1593 cgc.cmd[8] = 8;
1594 cgc.quiet = 1;
1595
1596 ret = pkt_generic_packet(pd, &cgc);
1597 if (ret)
1598 return ret;
1599
1600 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1601 sizeof(ti->track_information_length);
1602
1603 if (cgc.buflen > sizeof(track_information))
1604 cgc.buflen = sizeof(track_information);
1605
1606 cgc.cmd[8] = cgc.buflen;
1607 return pkt_generic_packet(pd, &cgc);
1608 }
1609
1610 static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
1611 long *last_written)
1612 {
1613 disc_information di;
1614 track_information ti;
1615 __u32 last_track;
1616 int ret = -1;
1617
1618 ret = pkt_get_disc_info(pd, &di);
1619 if (ret)
1620 return ret;
1621
1622 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1623 ret = pkt_get_track_info(pd, last_track, 1, &ti);
1624 if (ret)
1625 return ret;
1626
1627 /* if this track is blank, try the previous. */
1628 if (ti.blank) {
1629 last_track--;
1630 ret = pkt_get_track_info(pd, last_track, 1, &ti);
1631 if (ret)
1632 return ret;
1633 }
1634
1635 /* if last recorded field is valid, return it. */
1636 if (ti.lra_v) {
1637 *last_written = be32_to_cpu(ti.last_rec_address);
1638 } else {
1639 /* make it up instead */
1640 *last_written = be32_to_cpu(ti.track_start) +
1641 be32_to_cpu(ti.track_size);
1642 if (ti.free_blocks)
1643 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1644 }
1645 return 0;
1646 }
1647
1648 /*
1649 * write mode select package based on pd->settings
1650 */
1651 static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
1652 {
1653 struct packet_command cgc;
1654 struct scsi_sense_hdr sshdr;
1655 write_param_page *wp;
1656 char buffer[128];
1657 int ret, size;
1658
1659 /* doesn't apply to DVD+RW or DVD-RAM */
1660 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1661 return 0;
1662
1663 memset(buffer, 0, sizeof(buffer));
1664 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1665 cgc.sshdr = &sshdr;
1666 ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
1667 if (ret) {
1668 pkt_dump_sense(pd, &cgc);
1669 return ret;
1670 }
1671
1672 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1673 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1674 if (size > sizeof(buffer))
1675 size = sizeof(buffer);
1676
1677 /*
1678 * now get it all
1679 */
1680 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1681 cgc.sshdr = &sshdr;
1682 ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0);
1683 if (ret) {
1684 pkt_dump_sense(pd, &cgc);
1685 return ret;
1686 }
1687
1688 /*
1689 * write page is offset header + block descriptor length
1690 */
1691 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1692
1693 wp->fp = pd->settings.fp;
1694 wp->track_mode = pd->settings.track_mode;
1695 wp->write_type = pd->settings.write_type;
1696 wp->data_block_type = pd->settings.block_mode;
1697
1698 wp->multi_session = 0;
1699
1700 #ifdef PACKET_USE_LS
1701 wp->link_size = 7;
1702 wp->ls_v = 1;
1703 #endif
1704
1705 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1706 wp->session_format = 0;
1707 wp->subhdr2 = 0x20;
1708 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1709 wp->session_format = 0x20;
1710 wp->subhdr2 = 8;
1711 #if 0
1712 wp->mcn[0] = 0x80;
1713 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1714 #endif
1715 } else {
1716 /*
1717 * paranoia
1718 */
1719 pkt_err(pd, "write mode wrong %d\n", wp->data_block_type);
1720 return 1;
1721 }
1722 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1723
1724 cgc.buflen = cgc.cmd[8] = size;
1725 ret = pkt_mode_select(pd, &cgc);
1726 if (ret) {
1727 pkt_dump_sense(pd, &cgc);
1728 return ret;
1729 }
1730
1731 pkt_print_settings(pd);
1732 return 0;
1733 }
1734
1735 /*
1736 * 1 -- we can write to this track, 0 -- we can't
1737 */
1738 static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
1739 {
1740 switch (pd->mmc3_profile) {
1741 case 0x1a: /* DVD+RW */
1742 case 0x12: /* DVD-RAM */
1743 /* The track is always writable on DVD+RW/DVD-RAM */
1744 return 1;
1745 default:
1746 break;
1747 }
1748
1749 if (!ti->packet || !ti->fp)
1750 return 0;
1751
1752 /*
1753 * "good" settings as per Mt Fuji.
1754 */
1755 if (ti->rt == 0 && ti->blank == 0)
1756 return 1;
1757
1758 if (ti->rt == 0 && ti->blank == 1)
1759 return 1;
1760
1761 if (ti->rt == 1 && ti->blank == 0)
1762 return 1;
1763
1764 pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1765 return 0;
1766 }
1767
1768 /*
1769 * 1 -- we can write to this disc, 0 -- we can't
1770 */
1771 static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
1772 {
1773 switch (pd->mmc3_profile) {
1774 case 0x0a: /* CD-RW */
1775 case 0xffff: /* MMC3 not supported */
1776 break;
1777 case 0x1a: /* DVD+RW */
1778 case 0x13: /* DVD-RW */
1779 case 0x12: /* DVD-RAM */
1780 return 1;
1781 default:
1782 pkt_dbg(2, pd, "Wrong disc profile (%x)\n",
1783 pd->mmc3_profile);
1784 return 0;
1785 }
1786
1787 /*
1788 * for disc type 0xff we should probably reserve a new track.
1789 * but i'm not sure, should we leave this to user apps? probably.
1790 */
1791 if (di->disc_type == 0xff) {
1792 pkt_notice(pd, "unknown disc - no track?\n");
1793 return 0;
1794 }
1795
1796 if (di->disc_type != 0x20 && di->disc_type != 0) {
1797 pkt_err(pd, "wrong disc type (%x)\n", di->disc_type);
1798 return 0;
1799 }
1800
1801 if (di->erasable == 0) {
1802 pkt_notice(pd, "disc not erasable\n");
1803 return 0;
1804 }
1805
1806 if (di->border_status == PACKET_SESSION_RESERVED) {
1807 pkt_err(pd, "can't write to last track (reserved)\n");
1808 return 0;
1809 }
1810
1811 return 1;
1812 }
1813
1814 static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
1815 {
1816 struct packet_command cgc;
1817 unsigned char buf[12];
1818 disc_information di;
1819 track_information ti;
1820 int ret, track;
1821
1822 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1823 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1824 cgc.cmd[8] = 8;
1825 ret = pkt_generic_packet(pd, &cgc);
1826 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1827
1828 memset(&di, 0, sizeof(disc_information));
1829 memset(&ti, 0, sizeof(track_information));
1830
1831 ret = pkt_get_disc_info(pd, &di);
1832 if (ret) {
1833 pkt_err(pd, "failed get_disc\n");
1834 return ret;
1835 }
1836
1837 if (!pkt_writable_disc(pd, &di))
1838 return -EROFS;
1839
1840 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1841
1842 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1843 ret = pkt_get_track_info(pd, track, 1, &ti);
1844 if (ret) {
1845 pkt_err(pd, "failed get_track\n");
1846 return ret;
1847 }
1848
1849 if (!pkt_writable_track(pd, &ti)) {
1850 pkt_err(pd, "can't write to this track\n");
1851 return -EROFS;
1852 }
1853
1854 /*
1855 * we keep packet size in 512 byte units, makes it easier to
1856 * deal with request calculations.
1857 */
1858 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
1859 if (pd->settings.size == 0) {
1860 pkt_notice(pd, "detected zero packet size!\n");
1861 return -ENXIO;
1862 }
1863 if (pd->settings.size > PACKET_MAX_SECTORS) {
1864 pkt_err(pd, "packet size is too big\n");
1865 return -EROFS;
1866 }
1867 pd->settings.fp = ti.fp;
1868 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
1869
1870 if (ti.nwa_v) {
1871 pd->nwa = be32_to_cpu(ti.next_writable);
1872 set_bit(PACKET_NWA_VALID, &pd->flags);
1873 }
1874
1875 /*
1876 * in theory we could use lra on -RW media as well and just zero
1877 * blocks that haven't been written yet, but in practice that
1878 * is just a no-go. we'll use that for -R, naturally.
1879 */
1880 if (ti.lra_v) {
1881 pd->lra = be32_to_cpu(ti.last_rec_address);
1882 set_bit(PACKET_LRA_VALID, &pd->flags);
1883 } else {
1884 pd->lra = 0xffffffff;
1885 set_bit(PACKET_LRA_VALID, &pd->flags);
1886 }
1887
1888 /*
1889 * fine for now
1890 */
1891 pd->settings.link_loss = 7;
1892 pd->settings.write_type = 0; /* packet */
1893 pd->settings.track_mode = ti.track_mode;
1894
1895 /*
1896 * mode1 or mode2 disc
1897 */
1898 switch (ti.data_mode) {
1899 case PACKET_MODE1:
1900 pd->settings.block_mode = PACKET_BLOCK_MODE1;
1901 break;
1902 case PACKET_MODE2:
1903 pd->settings.block_mode = PACKET_BLOCK_MODE2;
1904 break;
1905 default:
1906 pkt_err(pd, "unknown data mode\n");
1907 return -EROFS;
1908 }
1909 return 0;
1910 }
1911
1912 /*
1913 * enable/disable write caching on drive
1914 */
1915 static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
1916 int set)
1917 {
1918 struct packet_command cgc;
1919 struct scsi_sense_hdr sshdr;
1920 unsigned char buf[64];
1921 int ret;
1922
1923 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1924 cgc.sshdr = &sshdr;
1925 cgc.buflen = pd->mode_offset + 12;
1926
1927 /*
1928 * caching mode page might not be there, so quiet this command
1929 */
1930 cgc.quiet = 1;
1931
1932 ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0);
1933 if (ret)
1934 return ret;
1935
1936 buf[pd->mode_offset + 10] |= (!!set << 2);
1937
1938 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
1939 ret = pkt_mode_select(pd, &cgc);
1940 if (ret) {
1941 pkt_err(pd, "write caching control failed\n");
1942 pkt_dump_sense(pd, &cgc);
1943 } else if (!ret && set)
1944 pkt_notice(pd, "enabled write caching\n");
1945 return ret;
1946 }
1947
1948 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
1949 {
1950 struct packet_command cgc;
1951
1952 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
1953 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
1954 cgc.cmd[4] = lockflag ? 1 : 0;
1955 return pkt_generic_packet(pd, &cgc);
1956 }
1957
1958 /*
1959 * Returns drive maximum write speed
1960 */
1961 static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
1962 unsigned *write_speed)
1963 {
1964 struct packet_command cgc;
1965 struct scsi_sense_hdr sshdr;
1966 unsigned char buf[256+18];
1967 unsigned char *cap_buf;
1968 int ret, offset;
1969
1970 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
1971 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
1972 cgc.sshdr = &sshdr;
1973
1974 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1975 if (ret) {
1976 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
1977 sizeof(struct mode_page_header);
1978 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
1979 if (ret) {
1980 pkt_dump_sense(pd, &cgc);
1981 return ret;
1982 }
1983 }
1984
1985 offset = 20; /* Obsoleted field, used by older drives */
1986 if (cap_buf[1] >= 28)
1987 offset = 28; /* Current write speed selected */
1988 if (cap_buf[1] >= 30) {
1989 /* If the drive reports at least one "Logical Unit Write
1990 * Speed Performance Descriptor Block", use the information
1991 * in the first block. (contains the highest speed)
1992 */
1993 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
1994 if (num_spdb > 0)
1995 offset = 34;
1996 }
1997
1998 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
1999 return 0;
2000 }
2001
2002 /* These tables from cdrecord - I don't have orange book */
2003 /* standard speed CD-RW (1-4x) */
2004 static char clv_to_speed[16] = {
2005 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2006 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2007 };
2008 /* high speed CD-RW (-10x) */
2009 static char hs_clv_to_speed[16] = {
2010 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2011 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2012 };
2013 /* ultra high speed CD-RW */
2014 static char us_clv_to_speed[16] = {
2015 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2016 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2017 };
2018
2019 /*
2020 * reads the maximum media speed from ATIP
2021 */
2022 static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
2023 unsigned *speed)
2024 {
2025 struct packet_command cgc;
2026 struct scsi_sense_hdr sshdr;
2027 unsigned char buf[64];
2028 unsigned int size, st, sp;
2029 int ret;
2030
2031 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2032 cgc.sshdr = &sshdr;
2033 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2034 cgc.cmd[1] = 2;
2035 cgc.cmd[2] = 4; /* READ ATIP */
2036 cgc.cmd[8] = 2;
2037 ret = pkt_generic_packet(pd, &cgc);
2038 if (ret) {
2039 pkt_dump_sense(pd, &cgc);
2040 return ret;
2041 }
2042 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2043 if (size > sizeof(buf))
2044 size = sizeof(buf);
2045
2046 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2047 cgc.sshdr = &sshdr;
2048 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2049 cgc.cmd[1] = 2;
2050 cgc.cmd[2] = 4;
2051 cgc.cmd[8] = size;
2052 ret = pkt_generic_packet(pd, &cgc);
2053 if (ret) {
2054 pkt_dump_sense(pd, &cgc);
2055 return ret;
2056 }
2057
2058 if (!(buf[6] & 0x40)) {
2059 pkt_notice(pd, "disc type is not CD-RW\n");
2060 return 1;
2061 }
2062 if (!(buf[6] & 0x4)) {
2063 pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n");
2064 return 1;
2065 }
2066
2067 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2068
2069 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2070
2071 /* Info from cdrecord */
2072 switch (st) {
2073 case 0: /* standard speed */
2074 *speed = clv_to_speed[sp];
2075 break;
2076 case 1: /* high speed */
2077 *speed = hs_clv_to_speed[sp];
2078 break;
2079 case 2: /* ultra high speed */
2080 *speed = us_clv_to_speed[sp];
2081 break;
2082 default:
2083 pkt_notice(pd, "unknown disc sub-type %d\n", st);
2084 return 1;
2085 }
2086 if (*speed) {
2087 pkt_info(pd, "maximum media speed: %d\n", *speed);
2088 return 0;
2089 } else {
2090 pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st);
2091 return 1;
2092 }
2093 }
2094
2095 static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
2096 {
2097 struct packet_command cgc;
2098 struct scsi_sense_hdr sshdr;
2099 int ret;
2100
2101 pkt_dbg(2, pd, "Performing OPC\n");
2102
2103 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2104 cgc.sshdr = &sshdr;
2105 cgc.timeout = 60*HZ;
2106 cgc.cmd[0] = GPCMD_SEND_OPC;
2107 cgc.cmd[1] = 1;
2108 ret = pkt_generic_packet(pd, &cgc);
2109 if (ret)
2110 pkt_dump_sense(pd, &cgc);
2111 return ret;
2112 }
2113
2114 static int pkt_open_write(struct pktcdvd_device *pd)
2115 {
2116 int ret;
2117 unsigned int write_speed, media_write_speed, read_speed;
2118
2119 ret = pkt_probe_settings(pd);
2120 if (ret) {
2121 pkt_dbg(2, pd, "failed probe\n");
2122 return ret;
2123 }
2124
2125 ret = pkt_set_write_settings(pd);
2126 if (ret) {
2127 pkt_dbg(1, pd, "failed saving write settings\n");
2128 return -EIO;
2129 }
2130
2131 pkt_write_caching(pd, USE_WCACHING);
2132
2133 ret = pkt_get_max_speed(pd, &write_speed);
2134 if (ret)
2135 write_speed = 16 * 177;
2136 switch (pd->mmc3_profile) {
2137 case 0x13: /* DVD-RW */
2138 case 0x1a: /* DVD+RW */
2139 case 0x12: /* DVD-RAM */
2140 pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed);
2141 break;
2142 default:
2143 ret = pkt_media_speed(pd, &media_write_speed);
2144 if (ret)
2145 media_write_speed = 16;
2146 write_speed = min(write_speed, media_write_speed * 177);
2147 pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176);
2148 break;
2149 }
2150 read_speed = write_speed;
2151
2152 ret = pkt_set_speed(pd, write_speed, read_speed);
2153 if (ret) {
2154 pkt_dbg(1, pd, "couldn't set write speed\n");
2155 return -EIO;
2156 }
2157 pd->write_speed = write_speed;
2158 pd->read_speed = read_speed;
2159
2160 ret = pkt_perform_opc(pd);
2161 if (ret) {
2162 pkt_dbg(1, pd, "Optimum Power Calibration failed\n");
2163 }
2164
2165 return 0;
2166 }
2167
2168 /*
2169 * called at open time.
2170 */
2171 static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
2172 {
2173 int ret;
2174 long lba;
2175 struct request_queue *q;
2176
2177 /*
2178 * We need to re-open the cdrom device without O_NONBLOCK to be able
2179 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2180 * so bdget() can't fail.
2181 */
2182 bdget(pd->bdev->bd_dev);
2183 ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd);
2184 if (ret)
2185 goto out;
2186
2187 ret = pkt_get_last_written(pd, &lba);
2188 if (ret) {
2189 pkt_err(pd, "pkt_get_last_written failed\n");
2190 goto out_putdev;
2191 }
2192
2193 set_capacity(pd->disk, lba << 2);
2194 set_capacity(pd->bdev->bd_disk, lba << 2);
2195 bd_set_size(pd->bdev, (loff_t)lba << 11);
2196
2197 q = bdev_get_queue(pd->bdev);
2198 if (write) {
2199 ret = pkt_open_write(pd);
2200 if (ret)
2201 goto out_putdev;
2202 /*
2203 * Some CDRW drives can not handle writes larger than one packet,
2204 * even if the size is a multiple of the packet size.
2205 */
2206 blk_queue_max_hw_sectors(q, pd->settings.size);
2207 set_bit(PACKET_WRITABLE, &pd->flags);
2208 } else {
2209 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2210 clear_bit(PACKET_WRITABLE, &pd->flags);
2211 }
2212
2213 ret = pkt_set_segment_merging(pd, q);
2214 if (ret)
2215 goto out_putdev;
2216
2217 if (write) {
2218 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2219 pkt_err(pd, "not enough memory for buffers\n");
2220 ret = -ENOMEM;
2221 goto out_putdev;
2222 }
2223 pkt_info(pd, "%lukB available on disc\n", lba << 1);
2224 }
2225
2226 return 0;
2227
2228 out_putdev:
2229 blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
2230 out:
2231 return ret;
2232 }
2233
2234 /*
2235 * called when the device is closed. makes sure that the device flushes
2236 * the internal cache before we close.
2237 */
2238 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2239 {
2240 if (flush && pkt_flush_cache(pd))
2241 pkt_dbg(1, pd, "not flushing cache\n");
2242
2243 pkt_lock_door(pd, 0);
2244
2245 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2246 blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
2247
2248 pkt_shrink_pktlist(pd);
2249 }
2250
2251 static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor)
2252 {
2253 if (dev_minor >= MAX_WRITERS)
2254 return NULL;
2255
2256 dev_minor = array_index_nospec(dev_minor, MAX_WRITERS);
2257 return pkt_devs[dev_minor];
2258 }
2259
2260 static int pkt_open(struct block_device *bdev, fmode_t mode)
2261 {
2262 struct pktcdvd_device *pd = NULL;
2263 int ret;
2264
2265 mutex_lock(&pktcdvd_mutex);
2266 mutex_lock(&ctl_mutex);
2267 pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
2268 if (!pd) {
2269 ret = -ENODEV;
2270 goto out;
2271 }
2272 BUG_ON(pd->refcnt < 0);
2273
2274 pd->refcnt++;
2275 if (pd->refcnt > 1) {
2276 if ((mode & FMODE_WRITE) &&
2277 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2278 ret = -EBUSY;
2279 goto out_dec;
2280 }
2281 } else {
2282 ret = pkt_open_dev(pd, mode & FMODE_WRITE);
2283 if (ret)
2284 goto out_dec;
2285 /*
2286 * needed here as well, since ext2 (among others) may change
2287 * the blocksize at mount time
2288 */
2289 set_blocksize(bdev, CD_FRAMESIZE);
2290 }
2291
2292 mutex_unlock(&ctl_mutex);
2293 mutex_unlock(&pktcdvd_mutex);
2294 return 0;
2295
2296 out_dec:
2297 pd->refcnt--;
2298 out:
2299 mutex_unlock(&ctl_mutex);
2300 mutex_unlock(&pktcdvd_mutex);
2301 return ret;
2302 }
2303
2304 static void pkt_close(struct gendisk *disk, fmode_t mode)
2305 {
2306 struct pktcdvd_device *pd = disk->private_data;
2307
2308 mutex_lock(&pktcdvd_mutex);
2309 mutex_lock(&ctl_mutex);
2310 pd->refcnt--;
2311 BUG_ON(pd->refcnt < 0);
2312 if (pd->refcnt == 0) {
2313 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2314 pkt_release_dev(pd, flush);
2315 }
2316 mutex_unlock(&ctl_mutex);
2317 mutex_unlock(&pktcdvd_mutex);
2318 }
2319
2320
2321 static void pkt_end_io_read_cloned(struct bio *bio)
2322 {
2323 struct packet_stacked_data *psd = bio->bi_private;
2324 struct pktcdvd_device *pd = psd->pd;
2325
2326 psd->bio->bi_status = bio->bi_status;
2327 bio_put(bio);
2328 bio_endio(psd->bio);
2329 mempool_free(psd, &psd_pool);
2330 pkt_bio_finished(pd);
2331 }
2332
2333 static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
2334 {
2335 struct bio *cloned_bio = bio_clone_fast(bio, GFP_NOIO, &pkt_bio_set);
2336 struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
2337
2338 psd->pd = pd;
2339 psd->bio = bio;
2340 bio_set_dev(cloned_bio, pd->bdev);
2341 cloned_bio->bi_private = psd;
2342 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2343 pd->stats.secs_r += bio_sectors(bio);
2344 pkt_queue_bio(pd, cloned_bio);
2345 }
2346
2347 static void pkt_make_request_write(struct request_queue *q, struct bio *bio)
2348 {
2349 struct pktcdvd_device *pd = q->queuedata;
2350 sector_t zone;
2351 struct packet_data *pkt;
2352 int was_empty, blocked_bio;
2353 struct pkt_rb_node *node;
2354
2355 zone = get_zone(bio->bi_iter.bi_sector, pd);
2356
2357 /*
2358 * If we find a matching packet in state WAITING or READ_WAIT, we can
2359 * just append this bio to that packet.
2360 */
2361 spin_lock(&pd->cdrw.active_list_lock);
2362 blocked_bio = 0;
2363 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2364 if (pkt->sector == zone) {
2365 spin_lock(&pkt->lock);
2366 if ((pkt->state == PACKET_WAITING_STATE) ||
2367 (pkt->state == PACKET_READ_WAIT_STATE)) {
2368 bio_list_add(&pkt->orig_bios, bio);
2369 pkt->write_size +=
2370 bio->bi_iter.bi_size / CD_FRAMESIZE;
2371 if ((pkt->write_size >= pkt->frames) &&
2372 (pkt->state == PACKET_WAITING_STATE)) {
2373 atomic_inc(&pkt->run_sm);
2374 wake_up(&pd->wqueue);
2375 }
2376 spin_unlock(&pkt->lock);
2377 spin_unlock(&pd->cdrw.active_list_lock);
2378 return;
2379 } else {
2380 blocked_bio = 1;
2381 }
2382 spin_unlock(&pkt->lock);
2383 }
2384 }
2385 spin_unlock(&pd->cdrw.active_list_lock);
2386
2387 /*
2388 * Test if there is enough room left in the bio work queue
2389 * (queue size >= congestion on mark).
2390 * If not, wait till the work queue size is below the congestion off mark.
2391 */
2392 spin_lock(&pd->lock);
2393 if (pd->write_congestion_on > 0
2394 && pd->bio_queue_size >= pd->write_congestion_on) {
2395 set_bdi_congested(q->backing_dev_info, BLK_RW_ASYNC);
2396 do {
2397 spin_unlock(&pd->lock);
2398 congestion_wait(BLK_RW_ASYNC, HZ);
2399 spin_lock(&pd->lock);
2400 } while(pd->bio_queue_size > pd->write_congestion_off);
2401 }
2402 spin_unlock(&pd->lock);
2403
2404 /*
2405 * No matching packet found. Store the bio in the work queue.
2406 */
2407 node = mempool_alloc(&pd->rb_pool, GFP_NOIO);
2408 node->bio = bio;
2409 spin_lock(&pd->lock);
2410 BUG_ON(pd->bio_queue_size < 0);
2411 was_empty = (pd->bio_queue_size == 0);
2412 pkt_rbtree_insert(pd, node);
2413 spin_unlock(&pd->lock);
2414
2415 /*
2416 * Wake up the worker thread.
2417 */
2418 atomic_set(&pd->scan_queue, 1);
2419 if (was_empty) {
2420 /* This wake_up is required for correct operation */
2421 wake_up(&pd->wqueue);
2422 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2423 /*
2424 * This wake up is not required for correct operation,
2425 * but improves performance in some cases.
2426 */
2427 wake_up(&pd->wqueue);
2428 }
2429 }
2430
2431 static blk_qc_t pkt_make_request(struct request_queue *q, struct bio *bio)
2432 {
2433 struct pktcdvd_device *pd;
2434 char b[BDEVNAME_SIZE];
2435 struct bio *split;
2436
2437 blk_queue_split(q, &bio);
2438
2439 pd = q->queuedata;
2440 if (!pd) {
2441 pr_err("%s incorrect request queue\n", bio_devname(bio, b));
2442 goto end_io;
2443 }
2444
2445 pkt_dbg(2, pd, "start = %6llx stop = %6llx\n",
2446 (unsigned long long)bio->bi_iter.bi_sector,
2447 (unsigned long long)bio_end_sector(bio));
2448
2449 /*
2450 * Clone READ bios so we can have our own bi_end_io callback.
2451 */
2452 if (bio_data_dir(bio) == READ) {
2453 pkt_make_request_read(pd, bio);
2454 return BLK_QC_T_NONE;
2455 }
2456
2457 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2458 pkt_notice(pd, "WRITE for ro device (%llu)\n",
2459 (unsigned long long)bio->bi_iter.bi_sector);
2460 goto end_io;
2461 }
2462
2463 if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) {
2464 pkt_err(pd, "wrong bio size\n");
2465 goto end_io;
2466 }
2467
2468 do {
2469 sector_t zone = get_zone(bio->bi_iter.bi_sector, pd);
2470 sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd);
2471
2472 if (last_zone != zone) {
2473 BUG_ON(last_zone != zone + pd->settings.size);
2474
2475 split = bio_split(bio, last_zone -
2476 bio->bi_iter.bi_sector,
2477 GFP_NOIO, &pkt_bio_set);
2478 bio_chain(split, bio);
2479 } else {
2480 split = bio;
2481 }
2482
2483 pkt_make_request_write(q, split);
2484 } while (split != bio);
2485
2486 return BLK_QC_T_NONE;
2487 end_io:
2488 bio_io_error(bio);
2489 return BLK_QC_T_NONE;
2490 }
2491
2492 static void pkt_init_queue(struct pktcdvd_device *pd)
2493 {
2494 struct request_queue *q = pd->disk->queue;
2495
2496 blk_queue_logical_block_size(q, CD_FRAMESIZE);
2497 blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS);
2498 q->queuedata = pd;
2499 }
2500
2501 static int pkt_seq_show(struct seq_file *m, void *p)
2502 {
2503 struct pktcdvd_device *pd = m->private;
2504 char *msg;
2505 char bdev_buf[BDEVNAME_SIZE];
2506 int states[PACKET_NUM_STATES];
2507
2508 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2509 bdevname(pd->bdev, bdev_buf));
2510
2511 seq_printf(m, "\nSettings:\n");
2512 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2513
2514 if (pd->settings.write_type == 0)
2515 msg = "Packet";
2516 else
2517 msg = "Unknown";
2518 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2519
2520 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2521 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2522
2523 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2524
2525 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2526 msg = "Mode 1";
2527 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2528 msg = "Mode 2";
2529 else
2530 msg = "Unknown";
2531 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2532
2533 seq_printf(m, "\nStatistics:\n");
2534 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2535 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2536 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2537 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2538 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2539
2540 seq_printf(m, "\nMisc:\n");
2541 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2542 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2543 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2544 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2545 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2546 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2547
2548 seq_printf(m, "\nQueue state:\n");
2549 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2550 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2551 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2552
2553 pkt_count_states(pd, states);
2554 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2555 states[0], states[1], states[2], states[3], states[4], states[5]);
2556
2557 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2558 pd->write_congestion_off,
2559 pd->write_congestion_on);
2560 return 0;
2561 }
2562
2563 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2564 {
2565 int i;
2566 int ret = 0;
2567 char b[BDEVNAME_SIZE];
2568 struct block_device *bdev;
2569
2570 if (pd->pkt_dev == dev) {
2571 pkt_err(pd, "recursive setup not allowed\n");
2572 return -EBUSY;
2573 }
2574 for (i = 0; i < MAX_WRITERS; i++) {
2575 struct pktcdvd_device *pd2 = pkt_devs[i];
2576 if (!pd2)
2577 continue;
2578 if (pd2->bdev->bd_dev == dev) {
2579 pkt_err(pd, "%s already setup\n",
2580 bdevname(pd2->bdev, b));
2581 return -EBUSY;
2582 }
2583 if (pd2->pkt_dev == dev) {
2584 pkt_err(pd, "can't chain pktcdvd devices\n");
2585 return -EBUSY;
2586 }
2587 }
2588
2589 bdev = bdget(dev);
2590 if (!bdev)
2591 return -ENOMEM;
2592 ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
2593 if (ret)
2594 return ret;
2595 if (!blk_queue_scsi_passthrough(bdev_get_queue(bdev))) {
2596 blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
2597 return -EINVAL;
2598 }
2599
2600 /* This is safe, since we have a reference from open(). */
2601 __module_get(THIS_MODULE);
2602
2603 pd->bdev = bdev;
2604 set_blocksize(bdev, CD_FRAMESIZE);
2605
2606 pkt_init_queue(pd);
2607
2608 atomic_set(&pd->cdrw.pending_bios, 0);
2609 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2610 if (IS_ERR(pd->cdrw.thread)) {
2611 pkt_err(pd, "can't start kernel thread\n");
2612 ret = -ENOMEM;
2613 goto out_mem;
2614 }
2615
2616 proc_create_single_data(pd->name, 0, pkt_proc, pkt_seq_show, pd);
2617 pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b));
2618 return 0;
2619
2620 out_mem:
2621 blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
2622 /* This is safe: open() is still holding a reference. */
2623 module_put(THIS_MODULE);
2624 return ret;
2625 }
2626
2627 static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
2628 {
2629 struct pktcdvd_device *pd = bdev->bd_disk->private_data;
2630 int ret;
2631
2632 pkt_dbg(2, pd, "cmd %x, dev %d:%d\n",
2633 cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
2634
2635 mutex_lock(&pktcdvd_mutex);
2636 switch (cmd) {
2637 case CDROMEJECT:
2638 /*
2639 * The door gets locked when the device is opened, so we
2640 * have to unlock it or else the eject command fails.
2641 */
2642 if (pd->refcnt == 1)
2643 pkt_lock_door(pd, 0);
2644 /* fall through */
2645 /*
2646 * forward selected CDROM ioctls to CD-ROM, for UDF
2647 */
2648 case CDROMMULTISESSION:
2649 case CDROMREADTOCENTRY:
2650 case CDROM_LAST_WRITTEN:
2651 case CDROM_SEND_PACKET:
2652 case SCSI_IOCTL_SEND_COMMAND:
2653 ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg);
2654 break;
2655
2656 default:
2657 pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd);
2658 ret = -ENOTTY;
2659 }
2660 mutex_unlock(&pktcdvd_mutex);
2661
2662 return ret;
2663 }
2664
2665 static unsigned int pkt_check_events(struct gendisk *disk,
2666 unsigned int clearing)
2667 {
2668 struct pktcdvd_device *pd = disk->private_data;
2669 struct gendisk *attached_disk;
2670
2671 if (!pd)
2672 return 0;
2673 if (!pd->bdev)
2674 return 0;
2675 attached_disk = pd->bdev->bd_disk;
2676 if (!attached_disk || !attached_disk->fops->check_events)
2677 return 0;
2678 return attached_disk->fops->check_events(attached_disk, clearing);
2679 }
2680
2681 static char *pkt_devnode(struct gendisk *disk, umode_t *mode)
2682 {
2683 return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name);
2684 }
2685
2686 static const struct block_device_operations pktcdvd_ops = {
2687 .owner = THIS_MODULE,
2688 .open = pkt_open,
2689 .release = pkt_close,
2690 .ioctl = pkt_ioctl,
2691 .compat_ioctl = blkdev_compat_ptr_ioctl,
2692 .check_events = pkt_check_events,
2693 .devnode = pkt_devnode,
2694 };
2695
2696 /*
2697 * Set up mapping from pktcdvd device to CD-ROM device.
2698 */
2699 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
2700 {
2701 int idx;
2702 int ret = -ENOMEM;
2703 struct pktcdvd_device *pd;
2704 struct gendisk *disk;
2705
2706 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2707
2708 for (idx = 0; idx < MAX_WRITERS; idx++)
2709 if (!pkt_devs[idx])
2710 break;
2711 if (idx == MAX_WRITERS) {
2712 pr_err("max %d writers supported\n", MAX_WRITERS);
2713 ret = -EBUSY;
2714 goto out_mutex;
2715 }
2716
2717 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2718 if (!pd)
2719 goto out_mutex;
2720
2721 ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE,
2722 sizeof(struct pkt_rb_node));
2723 if (ret)
2724 goto out_mem;
2725
2726 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2727 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2728 spin_lock_init(&pd->cdrw.active_list_lock);
2729
2730 spin_lock_init(&pd->lock);
2731 spin_lock_init(&pd->iosched.lock);
2732 bio_list_init(&pd->iosched.read_queue);
2733 bio_list_init(&pd->iosched.write_queue);
2734 sprintf(pd->name, DRIVER_NAME"%d", idx);
2735 init_waitqueue_head(&pd->wqueue);
2736 pd->bio_queue = RB_ROOT;
2737
2738 pd->write_congestion_on = write_congestion_on;
2739 pd->write_congestion_off = write_congestion_off;
2740
2741 ret = -ENOMEM;
2742 disk = alloc_disk(1);
2743 if (!disk)
2744 goto out_mem;
2745 pd->disk = disk;
2746 disk->major = pktdev_major;
2747 disk->first_minor = idx;
2748 disk->fops = &pktcdvd_ops;
2749 disk->flags = GENHD_FL_REMOVABLE;
2750 strcpy(disk->disk_name, pd->name);
2751 disk->private_data = pd;
2752 disk->queue = blk_alloc_queue(pkt_make_request, NUMA_NO_NODE);
2753 if (!disk->queue)
2754 goto out_mem2;
2755
2756 pd->pkt_dev = MKDEV(pktdev_major, idx);
2757 ret = pkt_new_dev(pd, dev);
2758 if (ret)
2759 goto out_mem2;
2760
2761 /* inherit events of the host device */
2762 disk->events = pd->bdev->bd_disk->events;
2763
2764 add_disk(disk);
2765
2766 pkt_sysfs_dev_new(pd);
2767 pkt_debugfs_dev_new(pd);
2768
2769 pkt_devs[idx] = pd;
2770 if (pkt_dev)
2771 *pkt_dev = pd->pkt_dev;
2772
2773 mutex_unlock(&ctl_mutex);
2774 return 0;
2775
2776 out_mem2:
2777 put_disk(disk);
2778 out_mem:
2779 mempool_exit(&pd->rb_pool);
2780 kfree(pd);
2781 out_mutex:
2782 mutex_unlock(&ctl_mutex);
2783 pr_err("setup of pktcdvd device failed\n");
2784 return ret;
2785 }
2786
2787 /*
2788 * Tear down mapping from pktcdvd device to CD-ROM device.
2789 */
2790 static int pkt_remove_dev(dev_t pkt_dev)
2791 {
2792 struct pktcdvd_device *pd;
2793 int idx;
2794 int ret = 0;
2795
2796 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2797
2798 for (idx = 0; idx < MAX_WRITERS; idx++) {
2799 pd = pkt_devs[idx];
2800 if (pd && (pd->pkt_dev == pkt_dev))
2801 break;
2802 }
2803 if (idx == MAX_WRITERS) {
2804 pr_debug("dev not setup\n");
2805 ret = -ENXIO;
2806 goto out;
2807 }
2808
2809 if (pd->refcnt > 0) {
2810 ret = -EBUSY;
2811 goto out;
2812 }
2813 if (!IS_ERR(pd->cdrw.thread))
2814 kthread_stop(pd->cdrw.thread);
2815
2816 pkt_devs[idx] = NULL;
2817
2818 pkt_debugfs_dev_remove(pd);
2819 pkt_sysfs_dev_remove(pd);
2820
2821 blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY);
2822
2823 remove_proc_entry(pd->name, pkt_proc);
2824 pkt_dbg(1, pd, "writer unmapped\n");
2825
2826 del_gendisk(pd->disk);
2827 blk_cleanup_queue(pd->disk->queue);
2828 put_disk(pd->disk);
2829
2830 mempool_exit(&pd->rb_pool);
2831 kfree(pd);
2832
2833 /* This is safe: open() is still holding a reference. */
2834 module_put(THIS_MODULE);
2835
2836 out:
2837 mutex_unlock(&ctl_mutex);
2838 return ret;
2839 }
2840
2841 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2842 {
2843 struct pktcdvd_device *pd;
2844
2845 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2846
2847 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2848 if (pd) {
2849 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2850 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
2851 } else {
2852 ctrl_cmd->dev = 0;
2853 ctrl_cmd->pkt_dev = 0;
2854 }
2855 ctrl_cmd->num_devices = MAX_WRITERS;
2856
2857 mutex_unlock(&ctl_mutex);
2858 }
2859
2860 static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2861 {
2862 void __user *argp = (void __user *)arg;
2863 struct pkt_ctrl_command ctrl_cmd;
2864 int ret = 0;
2865 dev_t pkt_dev = 0;
2866
2867 if (cmd != PACKET_CTRL_CMD)
2868 return -ENOTTY;
2869
2870 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
2871 return -EFAULT;
2872
2873 switch (ctrl_cmd.command) {
2874 case PKT_CTRL_CMD_SETUP:
2875 if (!capable(CAP_SYS_ADMIN))
2876 return -EPERM;
2877 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
2878 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
2879 break;
2880 case PKT_CTRL_CMD_TEARDOWN:
2881 if (!capable(CAP_SYS_ADMIN))
2882 return -EPERM;
2883 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
2884 break;
2885 case PKT_CTRL_CMD_STATUS:
2886 pkt_get_status(&ctrl_cmd);
2887 break;
2888 default:
2889 return -ENOTTY;
2890 }
2891
2892 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
2893 return -EFAULT;
2894 return ret;
2895 }
2896
2897 #ifdef CONFIG_COMPAT
2898 static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2899 {
2900 return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2901 }
2902 #endif
2903
2904 static const struct file_operations pkt_ctl_fops = {
2905 .open = nonseekable_open,
2906 .unlocked_ioctl = pkt_ctl_ioctl,
2907 #ifdef CONFIG_COMPAT
2908 .compat_ioctl = pkt_ctl_compat_ioctl,
2909 #endif
2910 .owner = THIS_MODULE,
2911 .llseek = no_llseek,
2912 };
2913
2914 static struct miscdevice pkt_misc = {
2915 .minor = MISC_DYNAMIC_MINOR,
2916 .name = DRIVER_NAME,
2917 .nodename = "pktcdvd/control",
2918 .fops = &pkt_ctl_fops
2919 };
2920
2921 static int __init pkt_init(void)
2922 {
2923 int ret;
2924
2925 mutex_init(&ctl_mutex);
2926
2927 ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE,
2928 sizeof(struct packet_stacked_data));
2929 if (ret)
2930 return ret;
2931 ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0);
2932 if (ret) {
2933 mempool_exit(&psd_pool);
2934 return ret;
2935 }
2936
2937 ret = register_blkdev(pktdev_major, DRIVER_NAME);
2938 if (ret < 0) {
2939 pr_err("unable to register block device\n");
2940 goto out2;
2941 }
2942 if (!pktdev_major)
2943 pktdev_major = ret;
2944
2945 ret = pkt_sysfs_init();
2946 if (ret)
2947 goto out;
2948
2949 pkt_debugfs_init();
2950
2951 ret = misc_register(&pkt_misc);
2952 if (ret) {
2953 pr_err("unable to register misc device\n");
2954 goto out_misc;
2955 }
2956
2957 pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
2958
2959 return 0;
2960
2961 out_misc:
2962 pkt_debugfs_cleanup();
2963 pkt_sysfs_cleanup();
2964 out:
2965 unregister_blkdev(pktdev_major, DRIVER_NAME);
2966 out2:
2967 mempool_exit(&psd_pool);
2968 bioset_exit(&pkt_bio_set);
2969 return ret;
2970 }
2971
2972 static void __exit pkt_exit(void)
2973 {
2974 remove_proc_entry("driver/"DRIVER_NAME, NULL);
2975 misc_deregister(&pkt_misc);
2976
2977 pkt_debugfs_cleanup();
2978 pkt_sysfs_cleanup();
2979
2980 unregister_blkdev(pktdev_major, DRIVER_NAME);
2981 mempool_exit(&psd_pool);
2982 bioset_exit(&pkt_bio_set);
2983 }
2984
2985 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
2986 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
2987 MODULE_LICENSE("GPL");
2988
2989 module_init(pkt_init);
2990 module_exit(pkt_exit);
Linux with added FPC-III support