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pktcdvd: push BKL down into driver
[linux-2.6/mini2440.git] / drivers / block / pktcdvd.c
blob85e44d07eab8c925542791362604adf6916fbe2d
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/smp_lock.h>
53 #include <linux/errno.h>
54 #include <linux/spinlock.h>
55 #include <linux/file.h>
56 #include <linux/proc_fs.h>
57 #include <linux/seq_file.h>
58 #include <linux/miscdevice.h>
59 #include <linux/freezer.h>
60 #include <linux/mutex.h>
61 #include <scsi/scsi_cmnd.h>
62 #include <scsi/scsi_ioctl.h>
63 #include <scsi/scsi.h>
64 #include <linux/debugfs.h>
65 #include <linux/device.h>
66
67 #include <asm/uaccess.h>
68
69 #define DRIVER_NAME "pktcdvd"
70
71 #if PACKET_DEBUG
72 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
73 #else
74 #define DPRINTK(fmt, args...)
75 #endif
76
77 #if PACKET_DEBUG > 1
78 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
79 #else
80 #define VPRINTK(fmt, args...)
81 #endif
82
83 #define MAX_SPEED 0xffff
84
85 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
86
87 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
88 static struct proc_dir_entry *pkt_proc;
89 static int pktdev_major;
90 static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
91 static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
92 static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
93 static mempool_t *psd_pool;
94
95 static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
96 static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */
97
98 /* forward declaration */
99 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
100 static int pkt_remove_dev(dev_t pkt_dev);
101 static int pkt_seq_show(struct seq_file *m, void *p);
102
103
104
105 /*
106 * create and register a pktcdvd kernel object.
107 */
108 static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
109 const char* name,
110 struct kobject* parent,
111 struct kobj_type* ktype)
112 {
113 struct pktcdvd_kobj *p;
114 int error;
115
116 p = kzalloc(sizeof(*p), GFP_KERNEL);
117 if (!p)
118 return NULL;
119 p->pd = pd;
120 error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
121 if (error) {
122 kobject_put(&p->kobj);
123 return NULL;
124 }
125 kobject_uevent(&p->kobj, KOBJ_ADD);
126 return p;
127 }
128 /*
129 * remove a pktcdvd kernel object.
130 */
131 static void pkt_kobj_remove(struct pktcdvd_kobj *p)
132 {
133 if (p)
134 kobject_put(&p->kobj);
135 }
136 /*
137 * default release function for pktcdvd kernel objects.
138 */
139 static void pkt_kobj_release(struct kobject *kobj)
140 {
141 kfree(to_pktcdvdkobj(kobj));
142 }
143
144
145 /**********************************************************
146 *
147 * sysfs interface for pktcdvd
148 * by (C) 2006 Thomas Maier <balagi@justmail.de>
149 *
150 **********************************************************/
151
152 #define DEF_ATTR(_obj,_name,_mode) \
153 static struct attribute _obj = { .name = _name, .mode = _mode }
154
155 /**********************************************************
156 /sys/class/pktcdvd/pktcdvd[0-7]/
157 stat/reset
158 stat/packets_started
159 stat/packets_finished
160 stat/kb_written
161 stat/kb_read
162 stat/kb_read_gather
163 write_queue/size
164 write_queue/congestion_off
165 write_queue/congestion_on
166 **********************************************************/
167
168 DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
169 DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
170 DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
171 DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
172 DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
173 DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
174
175 static struct attribute *kobj_pkt_attrs_stat[] = {
176 &kobj_pkt_attr_st1,
177 &kobj_pkt_attr_st2,
178 &kobj_pkt_attr_st3,
179 &kobj_pkt_attr_st4,
180 &kobj_pkt_attr_st5,
181 &kobj_pkt_attr_st6,
182 NULL
183 };
184
185 DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
186 DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
187 DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
188
189 static struct attribute *kobj_pkt_attrs_wqueue[] = {
190 &kobj_pkt_attr_wq1,
191 &kobj_pkt_attr_wq2,
192 &kobj_pkt_attr_wq3,
193 NULL
194 };
195
196 static ssize_t kobj_pkt_show(struct kobject *kobj,
197 struct attribute *attr, char *data)
198 {
199 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
200 int n = 0;
201 int v;
202 if (strcmp(attr->name, "packets_started") == 0) {
203 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
204
205 } else if (strcmp(attr->name, "packets_finished") == 0) {
206 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
207
208 } else if (strcmp(attr->name, "kb_written") == 0) {
209 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
210
211 } else if (strcmp(attr->name, "kb_read") == 0) {
212 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
213
214 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
215 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
216
217 } else if (strcmp(attr->name, "size") == 0) {
218 spin_lock(&pd->lock);
219 v = pd->bio_queue_size;
220 spin_unlock(&pd->lock);
221 n = sprintf(data, "%d\n", v);
222
223 } else if (strcmp(attr->name, "congestion_off") == 0) {
224 spin_lock(&pd->lock);
225 v = pd->write_congestion_off;
226 spin_unlock(&pd->lock);
227 n = sprintf(data, "%d\n", v);
228
229 } else if (strcmp(attr->name, "congestion_on") == 0) {
230 spin_lock(&pd->lock);
231 v = pd->write_congestion_on;
232 spin_unlock(&pd->lock);
233 n = sprintf(data, "%d\n", v);
234 }
235 return n;
236 }
237
238 static void init_write_congestion_marks(int* lo, int* hi)
239 {
240 if (*hi > 0) {
241 *hi = max(*hi, 500);
242 *hi = min(*hi, 1000000);
243 if (*lo <= 0)
244 *lo = *hi - 100;
245 else {
246 *lo = min(*lo, *hi - 100);
247 *lo = max(*lo, 100);
248 }
249 } else {
250 *hi = -1;
251 *lo = -1;
252 }
253 }
254
255 static ssize_t kobj_pkt_store(struct kobject *kobj,
256 struct attribute *attr,
257 const char *data, size_t len)
258 {
259 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
260 int val;
261
262 if (strcmp(attr->name, "reset") == 0 && len > 0) {
263 pd->stats.pkt_started = 0;
264 pd->stats.pkt_ended = 0;
265 pd->stats.secs_w = 0;
266 pd->stats.secs_rg = 0;
267 pd->stats.secs_r = 0;
268
269 } else if (strcmp(attr->name, "congestion_off") == 0
270 && sscanf(data, "%d", &val) == 1) {
271 spin_lock(&pd->lock);
272 pd->write_congestion_off = val;
273 init_write_congestion_marks(&pd->write_congestion_off,
274 &pd->write_congestion_on);
275 spin_unlock(&pd->lock);
276
277 } else if (strcmp(attr->name, "congestion_on") == 0
278 && sscanf(data, "%d", &val) == 1) {
279 spin_lock(&pd->lock);
280 pd->write_congestion_on = val;
281 init_write_congestion_marks(&pd->write_congestion_off,
282 &pd->write_congestion_on);
283 spin_unlock(&pd->lock);
284 }
285 return len;
286 }
287
288 static struct sysfs_ops kobj_pkt_ops = {
289 .show = kobj_pkt_show,
290 .store = kobj_pkt_store
291 };
292 static struct kobj_type kobj_pkt_type_stat = {
293 .release = pkt_kobj_release,
294 .sysfs_ops = &kobj_pkt_ops,
295 .default_attrs = kobj_pkt_attrs_stat
296 };
297 static struct kobj_type kobj_pkt_type_wqueue = {
298 .release = pkt_kobj_release,
299 .sysfs_ops = &kobj_pkt_ops,
300 .default_attrs = kobj_pkt_attrs_wqueue
301 };
302
303 static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
304 {
305 if (class_pktcdvd) {
306 pd->dev = device_create(class_pktcdvd, NULL, pd->pkt_dev, "%s", pd->name);
307 if (IS_ERR(pd->dev))
308 pd->dev = NULL;
309 }
310 if (pd->dev) {
311 pd->kobj_stat = pkt_kobj_create(pd, "stat",
312 &pd->dev->kobj,
313 &kobj_pkt_type_stat);
314 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
315 &pd->dev->kobj,
316 &kobj_pkt_type_wqueue);
317 }
318 }
319
320 static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
321 {
322 pkt_kobj_remove(pd->kobj_stat);
323 pkt_kobj_remove(pd->kobj_wqueue);
324 if (class_pktcdvd)
325 device_destroy(class_pktcdvd, pd->pkt_dev);
326 }
327
328
329 /********************************************************************
330 /sys/class/pktcdvd/
331 add map block device
332 remove unmap packet dev
333 device_map show mappings
334 *******************************************************************/
335
336 static void class_pktcdvd_release(struct class *cls)
337 {
338 kfree(cls);
339 }
340 static ssize_t class_pktcdvd_show_map(struct class *c, char *data)
341 {
342 int n = 0;
343 int idx;
344 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
345 for (idx = 0; idx < MAX_WRITERS; idx++) {
346 struct pktcdvd_device *pd = pkt_devs[idx];
347 if (!pd)
348 continue;
349 n += sprintf(data+n, "%s %u:%u %u:%u\n",
350 pd->name,
351 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
352 MAJOR(pd->bdev->bd_dev),
353 MINOR(pd->bdev->bd_dev));
354 }
355 mutex_unlock(&ctl_mutex);
356 return n;
357 }
358
359 static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf,
360 size_t count)
361 {
362 unsigned int major, minor;
363
364 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
365 /* pkt_setup_dev() expects caller to hold reference to self */
366 if (!try_module_get(THIS_MODULE))
367 return -ENODEV;
368
369 pkt_setup_dev(MKDEV(major, minor), NULL);
370
371 module_put(THIS_MODULE);
372
373 return count;
374 }
375
376 return -EINVAL;
377 }
378
379 static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf,
380 size_t count)
381 {
382 unsigned int major, minor;
383 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
384 pkt_remove_dev(MKDEV(major, minor));
385 return count;
386 }
387 return -EINVAL;
388 }
389
390 static struct class_attribute class_pktcdvd_attrs[] = {
391 __ATTR(add, 0200, NULL, class_pktcdvd_store_add),
392 __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove),
393 __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL),
394 __ATTR_NULL
395 };
396
397
398 static int pkt_sysfs_init(void)
399 {
400 int ret = 0;
401
402 /*
403 * create control files in sysfs
404 * /sys/class/pktcdvd/...
405 */
406 class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
407 if (!class_pktcdvd)
408 return -ENOMEM;
409 class_pktcdvd->name = DRIVER_NAME;
410 class_pktcdvd->owner = THIS_MODULE;
411 class_pktcdvd->class_release = class_pktcdvd_release;
412 class_pktcdvd->class_attrs = class_pktcdvd_attrs;
413 ret = class_register(class_pktcdvd);
414 if (ret) {
415 kfree(class_pktcdvd);
416 class_pktcdvd = NULL;
417 printk(DRIVER_NAME": failed to create class pktcdvd\n");
418 return ret;
419 }
420 return 0;
421 }
422
423 static void pkt_sysfs_cleanup(void)
424 {
425 if (class_pktcdvd)
426 class_destroy(class_pktcdvd);
427 class_pktcdvd = NULL;
428 }
429
430 /********************************************************************
431 entries in debugfs
432
433 /debugfs/pktcdvd[0-7]/
434 info
435
436 *******************************************************************/
437
438 static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
439 {
440 return pkt_seq_show(m, p);
441 }
442
443 static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
444 {
445 return single_open(file, pkt_debugfs_seq_show, inode->i_private);
446 }
447
448 static const struct file_operations debug_fops = {
449 .open = pkt_debugfs_fops_open,
450 .read = seq_read,
451 .llseek = seq_lseek,
452 .release = single_release,
453 .owner = THIS_MODULE,
454 };
455
456 static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
457 {
458 if (!pkt_debugfs_root)
459 return;
460 pd->dfs_f_info = NULL;
461 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
462 if (IS_ERR(pd->dfs_d_root)) {
463 pd->dfs_d_root = NULL;
464 return;
465 }
466 pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
467 pd->dfs_d_root, pd, &debug_fops);
468 if (IS_ERR(pd->dfs_f_info)) {
469 pd->dfs_f_info = NULL;
470 return;
471 }
472 }
473
474 static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
475 {
476 if (!pkt_debugfs_root)
477 return;
478 if (pd->dfs_f_info)
479 debugfs_remove(pd->dfs_f_info);
480 pd->dfs_f_info = NULL;
481 if (pd->dfs_d_root)
482 debugfs_remove(pd->dfs_d_root);
483 pd->dfs_d_root = NULL;
484 }
485
486 static void pkt_debugfs_init(void)
487 {
488 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
489 if (IS_ERR(pkt_debugfs_root)) {
490 pkt_debugfs_root = NULL;
491 return;
492 }
493 }
494
495 static void pkt_debugfs_cleanup(void)
496 {
497 if (!pkt_debugfs_root)
498 return;
499 debugfs_remove(pkt_debugfs_root);
500 pkt_debugfs_root = NULL;
501 }
502
503 /* ----------------------------------------------------------*/
504
505
506 static void pkt_bio_finished(struct pktcdvd_device *pd)
507 {
508 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
509 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
510 VPRINTK(DRIVER_NAME": queue empty\n");
511 atomic_set(&pd->iosched.attention, 1);
512 wake_up(&pd->wqueue);
513 }
514 }
515
516 static void pkt_bio_destructor(struct bio *bio)
517 {
518 kfree(bio->bi_io_vec);
519 kfree(bio);
520 }
521
522 static struct bio *pkt_bio_alloc(int nr_iovecs)
523 {
524 struct bio_vec *bvl = NULL;
525 struct bio *bio;
526
527 bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
528 if (!bio)
529 goto no_bio;
530 bio_init(bio);
531
532 bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
533 if (!bvl)
534 goto no_bvl;
535
536 bio->bi_max_vecs = nr_iovecs;
537 bio->bi_io_vec = bvl;
538 bio->bi_destructor = pkt_bio_destructor;
539
540 return bio;
541
542 no_bvl:
543 kfree(bio);
544 no_bio:
545 return NULL;
546 }
547
548 /*
549 * Allocate a packet_data struct
550 */
551 static struct packet_data *pkt_alloc_packet_data(int frames)
552 {
553 int i;
554 struct packet_data *pkt;
555
556 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
557 if (!pkt)
558 goto no_pkt;
559
560 pkt->frames = frames;
561 pkt->w_bio = pkt_bio_alloc(frames);
562 if (!pkt->w_bio)
563 goto no_bio;
564
565 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
566 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
567 if (!pkt->pages[i])
568 goto no_page;
569 }
570
571 spin_lock_init(&pkt->lock);
572
573 for (i = 0; i < frames; i++) {
574 struct bio *bio = pkt_bio_alloc(1);
575 if (!bio)
576 goto no_rd_bio;
577 pkt->r_bios[i] = bio;
578 }
579
580 return pkt;
581
582 no_rd_bio:
583 for (i = 0; i < frames; i++) {
584 struct bio *bio = pkt->r_bios[i];
585 if (bio)
586 bio_put(bio);
587 }
588
589 no_page:
590 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
591 if (pkt->pages[i])
592 __free_page(pkt->pages[i]);
593 bio_put(pkt->w_bio);
594 no_bio:
595 kfree(pkt);
596 no_pkt:
597 return NULL;
598 }
599
600 /*
601 * Free a packet_data struct
602 */
603 static void pkt_free_packet_data(struct packet_data *pkt)
604 {
605 int i;
606
607 for (i = 0; i < pkt->frames; i++) {
608 struct bio *bio = pkt->r_bios[i];
609 if (bio)
610 bio_put(bio);
611 }
612 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
613 __free_page(pkt->pages[i]);
614 bio_put(pkt->w_bio);
615 kfree(pkt);
616 }
617
618 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
619 {
620 struct packet_data *pkt, *next;
621
622 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
623
624 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
625 pkt_free_packet_data(pkt);
626 }
627 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
628 }
629
630 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
631 {
632 struct packet_data *pkt;
633
634 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
635
636 while (nr_packets > 0) {
637 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
638 if (!pkt) {
639 pkt_shrink_pktlist(pd);
640 return 0;
641 }
642 pkt->id = nr_packets;
643 pkt->pd = pd;
644 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
645 nr_packets--;
646 }
647 return 1;
648 }
649
650 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
651 {
652 struct rb_node *n = rb_next(&node->rb_node);
653 if (!n)
654 return NULL;
655 return rb_entry(n, struct pkt_rb_node, rb_node);
656 }
657
658 static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
659 {
660 rb_erase(&node->rb_node, &pd->bio_queue);
661 mempool_free(node, pd->rb_pool);
662 pd->bio_queue_size--;
663 BUG_ON(pd->bio_queue_size < 0);
664 }
665
666 /*
667 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
668 */
669 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
670 {
671 struct rb_node *n = pd->bio_queue.rb_node;
672 struct rb_node *next;
673 struct pkt_rb_node *tmp;
674
675 if (!n) {
676 BUG_ON(pd->bio_queue_size > 0);
677 return NULL;
678 }
679
680 for (;;) {
681 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
682 if (s <= tmp->bio->bi_sector)
683 next = n->rb_left;
684 else
685 next = n->rb_right;
686 if (!next)
687 break;
688 n = next;
689 }
690
691 if (s > tmp->bio->bi_sector) {
692 tmp = pkt_rbtree_next(tmp);
693 if (!tmp)
694 return NULL;
695 }
696 BUG_ON(s > tmp->bio->bi_sector);
697 return tmp;
698 }
699
700 /*
701 * Insert a node into the pd->bio_queue rb tree.
702 */
703 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
704 {
705 struct rb_node **p = &pd->bio_queue.rb_node;
706 struct rb_node *parent = NULL;
707 sector_t s = node->bio->bi_sector;
708 struct pkt_rb_node *tmp;
709
710 while (*p) {
711 parent = *p;
712 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
713 if (s < tmp->bio->bi_sector)
714 p = &(*p)->rb_left;
715 else
716 p = &(*p)->rb_right;
717 }
718 rb_link_node(&node->rb_node, parent, p);
719 rb_insert_color(&node->rb_node, &pd->bio_queue);
720 pd->bio_queue_size++;
721 }
722
723 /*
724 * Add a bio to a single linked list defined by its head and tail pointers.
725 */
726 static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
727 {
728 bio->bi_next = NULL;
729 if (*list_tail) {
730 BUG_ON((*list_head) == NULL);
731 (*list_tail)->bi_next = bio;
732 (*list_tail) = bio;
733 } else {
734 BUG_ON((*list_head) != NULL);
735 (*list_head) = bio;
736 (*list_tail) = bio;
737 }
738 }
739
740 /*
741 * Remove and return the first bio from a single linked list defined by its
742 * head and tail pointers.
743 */
744 static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
745 {
746 struct bio *bio;
747
748 if (*list_head == NULL)
749 return NULL;
750
751 bio = *list_head;
752 *list_head = bio->bi_next;
753 if (*list_head == NULL)
754 *list_tail = NULL;
755
756 bio->bi_next = NULL;
757 return bio;
758 }
759
760 /*
761 * Send a packet_command to the underlying block device and
762 * wait for completion.
763 */
764 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
765 {
766 struct request_queue *q = bdev_get_queue(pd->bdev);
767 struct request *rq;
768 int ret = 0;
769
770 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
771 WRITE : READ, __GFP_WAIT);
772
773 if (cgc->buflen) {
774 if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
775 goto out;
776 }
777
778 rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
779 memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
780
781 rq->timeout = 60*HZ;
782 rq->cmd_type = REQ_TYPE_BLOCK_PC;
783 rq->cmd_flags |= REQ_HARDBARRIER;
784 if (cgc->quiet)
785 rq->cmd_flags |= REQ_QUIET;
786
787 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
788 if (rq->errors)
789 ret = -EIO;
790 out:
791 blk_put_request(rq);
792 return ret;
793 }
794
795 /*
796 * A generic sense dump / resolve mechanism should be implemented across
797 * all ATAPI + SCSI devices.
798 */
799 static void pkt_dump_sense(struct packet_command *cgc)
800 {
801 static char *info[9] = { "No sense", "Recovered error", "Not ready",
802 "Medium error", "Hardware error", "Illegal request",
803 "Unit attention", "Data protect", "Blank check" };
804 int i;
805 struct request_sense *sense = cgc->sense;
806
807 printk(DRIVER_NAME":");
808 for (i = 0; i < CDROM_PACKET_SIZE; i++)
809 printk(" %02x", cgc->cmd[i]);
810 printk(" - ");
811
812 if (sense == NULL) {
813 printk("no sense\n");
814 return;
815 }
816
817 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
818
819 if (sense->sense_key > 8) {
820 printk(" (INVALID)\n");
821 return;
822 }
823
824 printk(" (%s)\n", info[sense->sense_key]);
825 }
826
827 /*
828 * flush the drive cache to media
829 */
830 static int pkt_flush_cache(struct pktcdvd_device *pd)
831 {
832 struct packet_command cgc;
833
834 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
835 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
836 cgc.quiet = 1;
837
838 /*
839 * the IMMED bit -- we default to not setting it, although that
840 * would allow a much faster close, this is safer
841 */
842 #if 0
843 cgc.cmd[1] = 1 << 1;
844 #endif
845 return pkt_generic_packet(pd, &cgc);
846 }
847
848 /*
849 * speed is given as the normal factor, e.g. 4 for 4x
850 */
851 static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
852 unsigned write_speed, unsigned read_speed)
853 {
854 struct packet_command cgc;
855 struct request_sense sense;
856 int ret;
857
858 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
859 cgc.sense = &sense;
860 cgc.cmd[0] = GPCMD_SET_SPEED;
861 cgc.cmd[2] = (read_speed >> 8) & 0xff;
862 cgc.cmd[3] = read_speed & 0xff;
863 cgc.cmd[4] = (write_speed >> 8) & 0xff;
864 cgc.cmd[5] = write_speed & 0xff;
865
866 if ((ret = pkt_generic_packet(pd, &cgc)))
867 pkt_dump_sense(&cgc);
868
869 return ret;
870 }
871
872 /*
873 * Queue a bio for processing by the low-level CD device. Must be called
874 * from process context.
875 */
876 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
877 {
878 spin_lock(&pd->iosched.lock);
879 if (bio_data_dir(bio) == READ) {
880 pkt_add_list_last(bio, &pd->iosched.read_queue,
881 &pd->iosched.read_queue_tail);
882 } else {
883 pkt_add_list_last(bio, &pd->iosched.write_queue,
884 &pd->iosched.write_queue_tail);
885 }
886 spin_unlock(&pd->iosched.lock);
887
888 atomic_set(&pd->iosched.attention, 1);
889 wake_up(&pd->wqueue);
890 }
891
892 /*
893 * Process the queued read/write requests. This function handles special
894 * requirements for CDRW drives:
895 * - A cache flush command must be inserted before a read request if the
896 * previous request was a write.
897 * - Switching between reading and writing is slow, so don't do it more often
898 * than necessary.
899 * - Optimize for throughput at the expense of latency. This means that streaming
900 * writes will never be interrupted by a read, but if the drive has to seek
901 * before the next write, switch to reading instead if there are any pending
902 * read requests.
903 * - Set the read speed according to current usage pattern. When only reading
904 * from the device, it's best to use the highest possible read speed, but
905 * when switching often between reading and writing, it's better to have the
906 * same read and write speeds.
907 */
908 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
909 {
910
911 if (atomic_read(&pd->iosched.attention) == 0)
912 return;
913 atomic_set(&pd->iosched.attention, 0);
914
915 for (;;) {
916 struct bio *bio;
917 int reads_queued, writes_queued;
918
919 spin_lock(&pd->iosched.lock);
920 reads_queued = (pd->iosched.read_queue != NULL);
921 writes_queued = (pd->iosched.write_queue != NULL);
922 spin_unlock(&pd->iosched.lock);
923
924 if (!reads_queued && !writes_queued)
925 break;
926
927 if (pd->iosched.writing) {
928 int need_write_seek = 1;
929 spin_lock(&pd->iosched.lock);
930 bio = pd->iosched.write_queue;
931 spin_unlock(&pd->iosched.lock);
932 if (bio && (bio->bi_sector == pd->iosched.last_write))
933 need_write_seek = 0;
934 if (need_write_seek && reads_queued) {
935 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
936 VPRINTK(DRIVER_NAME": write, waiting\n");
937 break;
938 }
939 pkt_flush_cache(pd);
940 pd->iosched.writing = 0;
941 }
942 } else {
943 if (!reads_queued && writes_queued) {
944 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
945 VPRINTK(DRIVER_NAME": read, waiting\n");
946 break;
947 }
948 pd->iosched.writing = 1;
949 }
950 }
951
952 spin_lock(&pd->iosched.lock);
953 if (pd->iosched.writing) {
954 bio = pkt_get_list_first(&pd->iosched.write_queue,
955 &pd->iosched.write_queue_tail);
956 } else {
957 bio = pkt_get_list_first(&pd->iosched.read_queue,
958 &pd->iosched.read_queue_tail);
959 }
960 spin_unlock(&pd->iosched.lock);
961
962 if (!bio)
963 continue;
964
965 if (bio_data_dir(bio) == READ)
966 pd->iosched.successive_reads += bio->bi_size >> 10;
967 else {
968 pd->iosched.successive_reads = 0;
969 pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
970 }
971 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
972 if (pd->read_speed == pd->write_speed) {
973 pd->read_speed = MAX_SPEED;
974 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
975 }
976 } else {
977 if (pd->read_speed != pd->write_speed) {
978 pd->read_speed = pd->write_speed;
979 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
980 }
981 }
982
983 atomic_inc(&pd->cdrw.pending_bios);
984 generic_make_request(bio);
985 }
986 }
987
988 /*
989 * Special care is needed if the underlying block device has a small
990 * max_phys_segments value.
991 */
992 static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
993 {
994 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
995 /*
996 * The cdrom device can handle one segment/frame
997 */
998 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
999 return 0;
1000 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
1001 /*
1002 * We can handle this case at the expense of some extra memory
1003 * copies during write operations
1004 */
1005 set_bit(PACKET_MERGE_SEGS, &pd->flags);
1006 return 0;
1007 } else {
1008 printk(DRIVER_NAME": cdrom max_phys_segments too small\n");
1009 return -EIO;
1010 }
1011 }
1012
1013 /*
1014 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
1015 */
1016 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
1017 {
1018 unsigned int copy_size = CD_FRAMESIZE;
1019
1020 while (copy_size > 0) {
1021 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
1022 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
1023 src_bvl->bv_offset + offs;
1024 void *vto = page_address(dst_page) + dst_offs;
1025 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
1026
1027 BUG_ON(len < 0);
1028 memcpy(vto, vfrom, len);
1029 kunmap_atomic(vfrom, KM_USER0);
1030
1031 seg++;
1032 offs = 0;
1033 dst_offs += len;
1034 copy_size -= len;
1035 }
1036 }
1037
1038 /*
1039 * Copy all data for this packet to pkt->pages[], so that
1040 * a) The number of required segments for the write bio is minimized, which
1041 * is necessary for some scsi controllers.
1042 * b) The data can be used as cache to avoid read requests if we receive a
1043 * new write request for the same zone.
1044 */
1045 static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
1046 {
1047 int f, p, offs;
1048
1049 /* Copy all data to pkt->pages[] */
1050 p = 0;
1051 offs = 0;
1052 for (f = 0; f < pkt->frames; f++) {
1053 if (bvec[f].bv_page != pkt->pages[p]) {
1054 void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset;
1055 void *vto = page_address(pkt->pages[p]) + offs;
1056 memcpy(vto, vfrom, CD_FRAMESIZE);
1057 kunmap_atomic(vfrom, KM_USER0);
1058 bvec[f].bv_page = pkt->pages[p];
1059 bvec[f].bv_offset = offs;
1060 } else {
1061 BUG_ON(bvec[f].bv_offset != offs);
1062 }
1063 offs += CD_FRAMESIZE;
1064 if (offs >= PAGE_SIZE) {
1065 offs = 0;
1066 p++;
1067 }
1068 }
1069 }
1070
1071 static void pkt_end_io_read(struct bio *bio, int err)
1072 {
1073 struct packet_data *pkt = bio->bi_private;
1074 struct pktcdvd_device *pd = pkt->pd;
1075 BUG_ON(!pd);
1076
1077 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
1078 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
1079
1080 if (err)
1081 atomic_inc(&pkt->io_errors);
1082 if (atomic_dec_and_test(&pkt->io_wait)) {
1083 atomic_inc(&pkt->run_sm);
1084 wake_up(&pd->wqueue);
1085 }
1086 pkt_bio_finished(pd);
1087 }
1088
1089 static void pkt_end_io_packet_write(struct bio *bio, int err)
1090 {
1091 struct packet_data *pkt = bio->bi_private;
1092 struct pktcdvd_device *pd = pkt->pd;
1093 BUG_ON(!pd);
1094
1095 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
1096
1097 pd->stats.pkt_ended++;
1098
1099 pkt_bio_finished(pd);
1100 atomic_dec(&pkt->io_wait);
1101 atomic_inc(&pkt->run_sm);
1102 wake_up(&pd->wqueue);
1103 }
1104
1105 /*
1106 * Schedule reads for the holes in a packet
1107 */
1108 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1109 {
1110 int frames_read = 0;
1111 struct bio *bio;
1112 int f;
1113 char written[PACKET_MAX_SIZE];
1114
1115 BUG_ON(!pkt->orig_bios);
1116
1117 atomic_set(&pkt->io_wait, 0);
1118 atomic_set(&pkt->io_errors, 0);
1119
1120 /*
1121 * Figure out which frames we need to read before we can write.
1122 */
1123 memset(written, 0, sizeof(written));
1124 spin_lock(&pkt->lock);
1125 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1126 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1127 int num_frames = bio->bi_size / CD_FRAMESIZE;
1128 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
1129 BUG_ON(first_frame < 0);
1130 BUG_ON(first_frame + num_frames > pkt->frames);
1131 for (f = first_frame; f < first_frame + num_frames; f++)
1132 written[f] = 1;
1133 }
1134 spin_unlock(&pkt->lock);
1135
1136 if (pkt->cache_valid) {
1137 VPRINTK("pkt_gather_data: zone %llx cached\n",
1138 (unsigned long long)pkt->sector);
1139 goto out_account;
1140 }
1141
1142 /*
1143 * Schedule reads for missing parts of the packet.
1144 */
1145 for (f = 0; f < pkt->frames; f++) {
1146 struct bio_vec *vec;
1147
1148 int p, offset;
1149 if (written[f])
1150 continue;
1151 bio = pkt->r_bios[f];
1152 vec = bio->bi_io_vec;
1153 bio_init(bio);
1154 bio->bi_max_vecs = 1;
1155 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1156 bio->bi_bdev = pd->bdev;
1157 bio->bi_end_io = pkt_end_io_read;
1158 bio->bi_private = pkt;
1159 bio->bi_io_vec = vec;
1160 bio->bi_destructor = pkt_bio_destructor;
1161
1162 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1163 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1164 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1165 f, pkt->pages[p], offset);
1166 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1167 BUG();
1168
1169 atomic_inc(&pkt->io_wait);
1170 bio->bi_rw = READ;
1171 pkt_queue_bio(pd, bio);
1172 frames_read++;
1173 }
1174
1175 out_account:
1176 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1177 frames_read, (unsigned long long)pkt->sector);
1178 pd->stats.pkt_started++;
1179 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
1180 }
1181
1182 /*
1183 * Find a packet matching zone, or the least recently used packet if
1184 * there is no match.
1185 */
1186 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1187 {
1188 struct packet_data *pkt;
1189
1190 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1191 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1192 list_del_init(&pkt->list);
1193 if (pkt->sector != zone)
1194 pkt->cache_valid = 0;
1195 return pkt;
1196 }
1197 }
1198 BUG();
1199 return NULL;
1200 }
1201
1202 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1203 {
1204 if (pkt->cache_valid) {
1205 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1206 } else {
1207 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1208 }
1209 }
1210
1211 /*
1212 * recover a failed write, query for relocation if possible
1213 *
1214 * returns 1 if recovery is possible, or 0 if not
1215 *
1216 */
1217 static int pkt_start_recovery(struct packet_data *pkt)
1218 {
1219 /*
1220 * FIXME. We need help from the file system to implement
1221 * recovery handling.
1222 */
1223 return 0;
1224 #if 0
1225 struct request *rq = pkt->rq;
1226 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1227 struct block_device *pkt_bdev;
1228 struct super_block *sb = NULL;
1229 unsigned long old_block, new_block;
1230 sector_t new_sector;
1231
1232 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1233 if (pkt_bdev) {
1234 sb = get_super(pkt_bdev);
1235 bdput(pkt_bdev);
1236 }
1237
1238 if (!sb)
1239 return 0;
1240
1241 if (!sb->s_op || !sb->s_op->relocate_blocks)
1242 goto out;
1243
1244 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1245 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1246 goto out;
1247
1248 new_sector = new_block * (CD_FRAMESIZE >> 9);
1249 pkt->sector = new_sector;
1250
1251 pkt->bio->bi_sector = new_sector;
1252 pkt->bio->bi_next = NULL;
1253 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
1254 pkt->bio->bi_idx = 0;
1255
1256 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
1257 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
1258 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
1259 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
1260 BUG_ON(pkt->bio->bi_private != pkt);
1261
1262 drop_super(sb);
1263 return 1;
1264
1265 out:
1266 drop_super(sb);
1267 return 0;
1268 #endif
1269 }
1270
1271 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1272 {
1273 #if PACKET_DEBUG > 1
1274 static const char *state_name[] = {
1275 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1276 };
1277 enum packet_data_state old_state = pkt->state;
1278 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
1279 state_name[old_state], state_name[state]);
1280 #endif
1281 pkt->state = state;
1282 }
1283
1284 /*
1285 * Scan the work queue to see if we can start a new packet.
1286 * returns non-zero if any work was done.
1287 */
1288 static int pkt_handle_queue(struct pktcdvd_device *pd)
1289 {
1290 struct packet_data *pkt, *p;
1291 struct bio *bio = NULL;
1292 sector_t zone = 0; /* Suppress gcc warning */
1293 struct pkt_rb_node *node, *first_node;
1294 struct rb_node *n;
1295 int wakeup;
1296
1297 VPRINTK("handle_queue\n");
1298
1299 atomic_set(&pd->scan_queue, 0);
1300
1301 if (list_empty(&pd->cdrw.pkt_free_list)) {
1302 VPRINTK("handle_queue: no pkt\n");
1303 return 0;
1304 }
1305
1306 /*
1307 * Try to find a zone we are not already working on.
1308 */
1309 spin_lock(&pd->lock);
1310 first_node = pkt_rbtree_find(pd, pd->current_sector);
1311 if (!first_node) {
1312 n = rb_first(&pd->bio_queue);
1313 if (n)
1314 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1315 }
1316 node = first_node;
1317 while (node) {
1318 bio = node->bio;
1319 zone = ZONE(bio->bi_sector, pd);
1320 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1321 if (p->sector == zone) {
1322 bio = NULL;
1323 goto try_next_bio;
1324 }
1325 }
1326 break;
1327 try_next_bio:
1328 node = pkt_rbtree_next(node);
1329 if (!node) {
1330 n = rb_first(&pd->bio_queue);
1331 if (n)
1332 node = rb_entry(n, struct pkt_rb_node, rb_node);
1333 }
1334 if (node == first_node)
1335 node = NULL;
1336 }
1337 spin_unlock(&pd->lock);
1338 if (!bio) {
1339 VPRINTK("handle_queue: no bio\n");
1340 return 0;
1341 }
1342
1343 pkt = pkt_get_packet_data(pd, zone);
1344
1345 pd->current_sector = zone + pd->settings.size;
1346 pkt->sector = zone;
1347 BUG_ON(pkt->frames != pd->settings.size >> 2);
1348 pkt->write_size = 0;
1349
1350 /*
1351 * Scan work queue for bios in the same zone and link them
1352 * to this packet.
1353 */
1354 spin_lock(&pd->lock);
1355 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
1356 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1357 bio = node->bio;
1358 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1359 (unsigned long long)ZONE(bio->bi_sector, pd));
1360 if (ZONE(bio->bi_sector, pd) != zone)
1361 break;
1362 pkt_rbtree_erase(pd, node);
1363 spin_lock(&pkt->lock);
1364 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
1365 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
1366 spin_unlock(&pkt->lock);
1367 }
1368 /* check write congestion marks, and if bio_queue_size is
1369 below, wake up any waiters */
1370 wakeup = (pd->write_congestion_on > 0
1371 && pd->bio_queue_size <= pd->write_congestion_off);
1372 spin_unlock(&pd->lock);
1373 if (wakeup)
1374 clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE);
1375
1376 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1377 pkt_set_state(pkt, PACKET_WAITING_STATE);
1378 atomic_set(&pkt->run_sm, 1);
1379
1380 spin_lock(&pd->cdrw.active_list_lock);
1381 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1382 spin_unlock(&pd->cdrw.active_list_lock);
1383
1384 return 1;
1385 }
1386
1387 /*
1388 * Assemble a bio to write one packet and queue the bio for processing
1389 * by the underlying block device.
1390 */
1391 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1392 {
1393 struct bio *bio;
1394 int f;
1395 int frames_write;
1396 struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
1397
1398 for (f = 0; f < pkt->frames; f++) {
1399 bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1400 bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1401 }
1402
1403 /*
1404 * Fill-in bvec with data from orig_bios.
1405 */
1406 frames_write = 0;
1407 spin_lock(&pkt->lock);
1408 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1409 int segment = bio->bi_idx;
1410 int src_offs = 0;
1411 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1412 int num_frames = bio->bi_size / CD_FRAMESIZE;
1413 BUG_ON(first_frame < 0);
1414 BUG_ON(first_frame + num_frames > pkt->frames);
1415 for (f = first_frame; f < first_frame + num_frames; f++) {
1416 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1417
1418 while (src_offs >= src_bvl->bv_len) {
1419 src_offs -= src_bvl->bv_len;
1420 segment++;
1421 BUG_ON(segment >= bio->bi_vcnt);
1422 src_bvl = bio_iovec_idx(bio, segment);
1423 }
1424
1425 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1426 bvec[f].bv_page = src_bvl->bv_page;
1427 bvec[f].bv_offset = src_bvl->bv_offset + src_offs;
1428 } else {
1429 pkt_copy_bio_data(bio, segment, src_offs,
1430 bvec[f].bv_page, bvec[f].bv_offset);
1431 }
1432 src_offs += CD_FRAMESIZE;
1433 frames_write++;
1434 }
1435 }
1436 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1437 spin_unlock(&pkt->lock);
1438
1439 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1440 frames_write, (unsigned long long)pkt->sector);
1441 BUG_ON(frames_write != pkt->write_size);
1442
1443 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1444 pkt_make_local_copy(pkt, bvec);
1445 pkt->cache_valid = 1;
1446 } else {
1447 pkt->cache_valid = 0;
1448 }
1449
1450 /* Start the write request */
1451 bio_init(pkt->w_bio);
1452 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1453 pkt->w_bio->bi_sector = pkt->sector;
1454 pkt->w_bio->bi_bdev = pd->bdev;
1455 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1456 pkt->w_bio->bi_private = pkt;
1457 pkt->w_bio->bi_io_vec = bvec;
1458 pkt->w_bio->bi_destructor = pkt_bio_destructor;
1459 for (f = 0; f < pkt->frames; f++)
1460 if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
1461 BUG();
1462 VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt);
1463
1464 atomic_set(&pkt->io_wait, 1);
1465 pkt->w_bio->bi_rw = WRITE;
1466 pkt_queue_bio(pd, pkt->w_bio);
1467 }
1468
1469 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1470 {
1471 struct bio *bio, *next;
1472
1473 if (!uptodate)
1474 pkt->cache_valid = 0;
1475
1476 /* Finish all bios corresponding to this packet */
1477 bio = pkt->orig_bios;
1478 while (bio) {
1479 next = bio->bi_next;
1480 bio->bi_next = NULL;
1481 bio_endio(bio, uptodate ? 0 : -EIO);
1482 bio = next;
1483 }
1484 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1485 }
1486
1487 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1488 {
1489 int uptodate;
1490
1491 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1492
1493 for (;;) {
1494 switch (pkt->state) {
1495 case PACKET_WAITING_STATE:
1496 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1497 return;
1498
1499 pkt->sleep_time = 0;
1500 pkt_gather_data(pd, pkt);
1501 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1502 break;
1503
1504 case PACKET_READ_WAIT_STATE:
1505 if (atomic_read(&pkt->io_wait) > 0)
1506 return;
1507
1508 if (atomic_read(&pkt->io_errors) > 0) {
1509 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1510 } else {
1511 pkt_start_write(pd, pkt);
1512 }
1513 break;
1514
1515 case PACKET_WRITE_WAIT_STATE:
1516 if (atomic_read(&pkt->io_wait) > 0)
1517 return;
1518
1519 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1520 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1521 } else {
1522 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1523 }
1524 break;
1525
1526 case PACKET_RECOVERY_STATE:
1527 if (pkt_start_recovery(pkt)) {
1528 pkt_start_write(pd, pkt);
1529 } else {
1530 VPRINTK("No recovery possible\n");
1531 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1532 }
1533 break;
1534
1535 case PACKET_FINISHED_STATE:
1536 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1537 pkt_finish_packet(pkt, uptodate);
1538 return;
1539
1540 default:
1541 BUG();
1542 break;
1543 }
1544 }
1545 }
1546
1547 static void pkt_handle_packets(struct pktcdvd_device *pd)
1548 {
1549 struct packet_data *pkt, *next;
1550
1551 VPRINTK("pkt_handle_packets\n");
1552
1553 /*
1554 * Run state machine for active packets
1555 */
1556 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1557 if (atomic_read(&pkt->run_sm) > 0) {
1558 atomic_set(&pkt->run_sm, 0);
1559 pkt_run_state_machine(pd, pkt);
1560 }
1561 }
1562
1563 /*
1564 * Move no longer active packets to the free list
1565 */
1566 spin_lock(&pd->cdrw.active_list_lock);
1567 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1568 if (pkt->state == PACKET_FINISHED_STATE) {
1569 list_del(&pkt->list);
1570 pkt_put_packet_data(pd, pkt);
1571 pkt_set_state(pkt, PACKET_IDLE_STATE);
1572 atomic_set(&pd->scan_queue, 1);
1573 }
1574 }
1575 spin_unlock(&pd->cdrw.active_list_lock);
1576 }
1577
1578 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1579 {
1580 struct packet_data *pkt;
1581 int i;
1582
1583 for (i = 0; i < PACKET_NUM_STATES; i++)
1584 states[i] = 0;
1585
1586 spin_lock(&pd->cdrw.active_list_lock);
1587 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1588 states[pkt->state]++;
1589 }
1590 spin_unlock(&pd->cdrw.active_list_lock);
1591 }
1592
1593 /*
1594 * kcdrwd is woken up when writes have been queued for one of our
1595 * registered devices
1596 */
1597 static int kcdrwd(void *foobar)
1598 {
1599 struct pktcdvd_device *pd = foobar;
1600 struct packet_data *pkt;
1601 long min_sleep_time, residue;
1602
1603 set_user_nice(current, -20);
1604 set_freezable();
1605
1606 for (;;) {
1607 DECLARE_WAITQUEUE(wait, current);
1608
1609 /*
1610 * Wait until there is something to do
1611 */
1612 add_wait_queue(&pd->wqueue, &wait);
1613 for (;;) {
1614 set_current_state(TASK_INTERRUPTIBLE);
1615
1616 /* Check if we need to run pkt_handle_queue */
1617 if (atomic_read(&pd->scan_queue) > 0)
1618 goto work_to_do;
1619
1620 /* Check if we need to run the state machine for some packet */
1621 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1622 if (atomic_read(&pkt->run_sm) > 0)
1623 goto work_to_do;
1624 }
1625
1626 /* Check if we need to process the iosched queues */
1627 if (atomic_read(&pd->iosched.attention) != 0)
1628 goto work_to_do;
1629
1630 /* Otherwise, go to sleep */
1631 if (PACKET_DEBUG > 1) {
1632 int states[PACKET_NUM_STATES];
1633 pkt_count_states(pd, states);
1634 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1635 states[0], states[1], states[2], states[3],
1636 states[4], states[5]);
1637 }
1638
1639 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1640 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1641 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1642 min_sleep_time = pkt->sleep_time;
1643 }
1644
1645 generic_unplug_device(bdev_get_queue(pd->bdev));
1646
1647 VPRINTK("kcdrwd: sleeping\n");
1648 residue = schedule_timeout(min_sleep_time);
1649 VPRINTK("kcdrwd: wake up\n");
1650
1651 /* make swsusp happy with our thread */
1652 try_to_freeze();
1653
1654 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1655 if (!pkt->sleep_time)
1656 continue;
1657 pkt->sleep_time -= min_sleep_time - residue;
1658 if (pkt->sleep_time <= 0) {
1659 pkt->sleep_time = 0;
1660 atomic_inc(&pkt->run_sm);
1661 }
1662 }
1663
1664 if (kthread_should_stop())
1665 break;
1666 }
1667 work_to_do:
1668 set_current_state(TASK_RUNNING);
1669 remove_wait_queue(&pd->wqueue, &wait);
1670
1671 if (kthread_should_stop())
1672 break;
1673
1674 /*
1675 * if pkt_handle_queue returns true, we can queue
1676 * another request.
1677 */
1678 while (pkt_handle_queue(pd))
1679 ;
1680
1681 /*
1682 * Handle packet state machine
1683 */
1684 pkt_handle_packets(pd);
1685
1686 /*
1687 * Handle iosched queues
1688 */
1689 pkt_iosched_process_queue(pd);
1690 }
1691
1692 return 0;
1693 }
1694
1695 static void pkt_print_settings(struct pktcdvd_device *pd)
1696 {
1697 printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1698 printk("%u blocks, ", pd->settings.size >> 2);
1699 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1700 }
1701
1702 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1703 {
1704 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1705
1706 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1707 cgc->cmd[2] = page_code | (page_control << 6);
1708 cgc->cmd[7] = cgc->buflen >> 8;
1709 cgc->cmd[8] = cgc->buflen & 0xff;
1710 cgc->data_direction = CGC_DATA_READ;
1711 return pkt_generic_packet(pd, cgc);
1712 }
1713
1714 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1715 {
1716 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1717 memset(cgc->buffer, 0, 2);
1718 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1719 cgc->cmd[1] = 0x10; /* PF */
1720 cgc->cmd[7] = cgc->buflen >> 8;
1721 cgc->cmd[8] = cgc->buflen & 0xff;
1722 cgc->data_direction = CGC_DATA_WRITE;
1723 return pkt_generic_packet(pd, cgc);
1724 }
1725
1726 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1727 {
1728 struct packet_command cgc;
1729 int ret;
1730
1731 /* set up command and get the disc info */
1732 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1733 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1734 cgc.cmd[8] = cgc.buflen = 2;
1735 cgc.quiet = 1;
1736
1737 if ((ret = pkt_generic_packet(pd, &cgc)))
1738 return ret;
1739
1740 /* not all drives have the same disc_info length, so requeue
1741 * packet with the length the drive tells us it can supply
1742 */
1743 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1744 sizeof(di->disc_information_length);
1745
1746 if (cgc.buflen > sizeof(disc_information))
1747 cgc.buflen = sizeof(disc_information);
1748
1749 cgc.cmd[8] = cgc.buflen;
1750 return pkt_generic_packet(pd, &cgc);
1751 }
1752
1753 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1754 {
1755 struct packet_command cgc;
1756 int ret;
1757
1758 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1759 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1760 cgc.cmd[1] = type & 3;
1761 cgc.cmd[4] = (track & 0xff00) >> 8;
1762 cgc.cmd[5] = track & 0xff;
1763 cgc.cmd[8] = 8;
1764 cgc.quiet = 1;
1765
1766 if ((ret = pkt_generic_packet(pd, &cgc)))
1767 return ret;
1768
1769 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1770 sizeof(ti->track_information_length);
1771
1772 if (cgc.buflen > sizeof(track_information))
1773 cgc.buflen = sizeof(track_information);
1774
1775 cgc.cmd[8] = cgc.buflen;
1776 return pkt_generic_packet(pd, &cgc);
1777 }
1778
1779 static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
1780 long *last_written)
1781 {
1782 disc_information di;
1783 track_information ti;
1784 __u32 last_track;
1785 int ret = -1;
1786
1787 if ((ret = pkt_get_disc_info(pd, &di)))
1788 return ret;
1789
1790 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1791 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1792 return ret;
1793
1794 /* if this track is blank, try the previous. */
1795 if (ti.blank) {
1796 last_track--;
1797 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1798 return ret;
1799 }
1800
1801 /* if last recorded field is valid, return it. */
1802 if (ti.lra_v) {
1803 *last_written = be32_to_cpu(ti.last_rec_address);
1804 } else {
1805 /* make it up instead */
1806 *last_written = be32_to_cpu(ti.track_start) +
1807 be32_to_cpu(ti.track_size);
1808 if (ti.free_blocks)
1809 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1810 }
1811 return 0;
1812 }
1813
1814 /*
1815 * write mode select package based on pd->settings
1816 */
1817 static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
1818 {
1819 struct packet_command cgc;
1820 struct request_sense sense;
1821 write_param_page *wp;
1822 char buffer[128];
1823 int ret, size;
1824
1825 /* doesn't apply to DVD+RW or DVD-RAM */
1826 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1827 return 0;
1828
1829 memset(buffer, 0, sizeof(buffer));
1830 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1831 cgc.sense = &sense;
1832 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1833 pkt_dump_sense(&cgc);
1834 return ret;
1835 }
1836
1837 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1838 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1839 if (size > sizeof(buffer))
1840 size = sizeof(buffer);
1841
1842 /*
1843 * now get it all
1844 */
1845 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1846 cgc.sense = &sense;
1847 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1848 pkt_dump_sense(&cgc);
1849 return ret;
1850 }
1851
1852 /*
1853 * write page is offset header + block descriptor length
1854 */
1855 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1856
1857 wp->fp = pd->settings.fp;
1858 wp->track_mode = pd->settings.track_mode;
1859 wp->write_type = pd->settings.write_type;
1860 wp->data_block_type = pd->settings.block_mode;
1861
1862 wp->multi_session = 0;
1863
1864 #ifdef PACKET_USE_LS
1865 wp->link_size = 7;
1866 wp->ls_v = 1;
1867 #endif
1868
1869 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1870 wp->session_format = 0;
1871 wp->subhdr2 = 0x20;
1872 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1873 wp->session_format = 0x20;
1874 wp->subhdr2 = 8;
1875 #if 0
1876 wp->mcn[0] = 0x80;
1877 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1878 #endif
1879 } else {
1880 /*
1881 * paranoia
1882 */
1883 printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type);
1884 return 1;
1885 }
1886 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1887
1888 cgc.buflen = cgc.cmd[8] = size;
1889 if ((ret = pkt_mode_select(pd, &cgc))) {
1890 pkt_dump_sense(&cgc);
1891 return ret;
1892 }
1893
1894 pkt_print_settings(pd);
1895 return 0;
1896 }
1897
1898 /*
1899 * 1 -- we can write to this track, 0 -- we can't
1900 */
1901 static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
1902 {
1903 switch (pd->mmc3_profile) {
1904 case 0x1a: /* DVD+RW */
1905 case 0x12: /* DVD-RAM */
1906 /* The track is always writable on DVD+RW/DVD-RAM */
1907 return 1;
1908 default:
1909 break;
1910 }
1911
1912 if (!ti->packet || !ti->fp)
1913 return 0;
1914
1915 /*
1916 * "good" settings as per Mt Fuji.
1917 */
1918 if (ti->rt == 0 && ti->blank == 0)
1919 return 1;
1920
1921 if (ti->rt == 0 && ti->blank == 1)
1922 return 1;
1923
1924 if (ti->rt == 1 && ti->blank == 0)
1925 return 1;
1926
1927 printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1928 return 0;
1929 }
1930
1931 /*
1932 * 1 -- we can write to this disc, 0 -- we can't
1933 */
1934 static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
1935 {
1936 switch (pd->mmc3_profile) {
1937 case 0x0a: /* CD-RW */
1938 case 0xffff: /* MMC3 not supported */
1939 break;
1940 case 0x1a: /* DVD+RW */
1941 case 0x13: /* DVD-RW */
1942 case 0x12: /* DVD-RAM */
1943 return 1;
1944 default:
1945 VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile);
1946 return 0;
1947 }
1948
1949 /*
1950 * for disc type 0xff we should probably reserve a new track.
1951 * but i'm not sure, should we leave this to user apps? probably.
1952 */
1953 if (di->disc_type == 0xff) {
1954 printk(DRIVER_NAME": Unknown disc. No track?\n");
1955 return 0;
1956 }
1957
1958 if (di->disc_type != 0x20 && di->disc_type != 0) {
1959 printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type);
1960 return 0;
1961 }
1962
1963 if (di->erasable == 0) {
1964 printk(DRIVER_NAME": Disc not erasable\n");
1965 return 0;
1966 }
1967
1968 if (di->border_status == PACKET_SESSION_RESERVED) {
1969 printk(DRIVER_NAME": Can't write to last track (reserved)\n");
1970 return 0;
1971 }
1972
1973 return 1;
1974 }
1975
1976 static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
1977 {
1978 struct packet_command cgc;
1979 unsigned char buf[12];
1980 disc_information di;
1981 track_information ti;
1982 int ret, track;
1983
1984 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1985 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1986 cgc.cmd[8] = 8;
1987 ret = pkt_generic_packet(pd, &cgc);
1988 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1989
1990 memset(&di, 0, sizeof(disc_information));
1991 memset(&ti, 0, sizeof(track_information));
1992
1993 if ((ret = pkt_get_disc_info(pd, &di))) {
1994 printk("failed get_disc\n");
1995 return ret;
1996 }
1997
1998 if (!pkt_writable_disc(pd, &di))
1999 return -EROFS;
2000
2001 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
2002
2003 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
2004 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
2005 printk(DRIVER_NAME": failed get_track\n");
2006 return ret;
2007 }
2008
2009 if (!pkt_writable_track(pd, &ti)) {
2010 printk(DRIVER_NAME": can't write to this track\n");
2011 return -EROFS;
2012 }
2013
2014 /*
2015 * we keep packet size in 512 byte units, makes it easier to
2016 * deal with request calculations.
2017 */
2018 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
2019 if (pd->settings.size == 0) {
2020 printk(DRIVER_NAME": detected zero packet size!\n");
2021 return -ENXIO;
2022 }
2023 if (pd->settings.size > PACKET_MAX_SECTORS) {
2024 printk(DRIVER_NAME": packet size is too big\n");
2025 return -EROFS;
2026 }
2027 pd->settings.fp = ti.fp;
2028 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
2029
2030 if (ti.nwa_v) {
2031 pd->nwa = be32_to_cpu(ti.next_writable);
2032 set_bit(PACKET_NWA_VALID, &pd->flags);
2033 }
2034
2035 /*
2036 * in theory we could use lra on -RW media as well and just zero
2037 * blocks that haven't been written yet, but in practice that
2038 * is just a no-go. we'll use that for -R, naturally.
2039 */
2040 if (ti.lra_v) {
2041 pd->lra = be32_to_cpu(ti.last_rec_address);
2042 set_bit(PACKET_LRA_VALID, &pd->flags);
2043 } else {
2044 pd->lra = 0xffffffff;
2045 set_bit(PACKET_LRA_VALID, &pd->flags);
2046 }
2047
2048 /*
2049 * fine for now
2050 */
2051 pd->settings.link_loss = 7;
2052 pd->settings.write_type = 0; /* packet */
2053 pd->settings.track_mode = ti.track_mode;
2054
2055 /*
2056 * mode1 or mode2 disc
2057 */
2058 switch (ti.data_mode) {
2059 case PACKET_MODE1:
2060 pd->settings.block_mode = PACKET_BLOCK_MODE1;
2061 break;
2062 case PACKET_MODE2:
2063 pd->settings.block_mode = PACKET_BLOCK_MODE2;
2064 break;
2065 default:
2066 printk(DRIVER_NAME": unknown data mode\n");
2067 return -EROFS;
2068 }
2069 return 0;
2070 }
2071
2072 /*
2073 * enable/disable write caching on drive
2074 */
2075 static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
2076 int set)
2077 {
2078 struct packet_command cgc;
2079 struct request_sense sense;
2080 unsigned char buf[64];
2081 int ret;
2082
2083 memset(buf, 0, sizeof(buf));
2084 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
2085 cgc.sense = &sense;
2086 cgc.buflen = pd->mode_offset + 12;
2087
2088 /*
2089 * caching mode page might not be there, so quiet this command
2090 */
2091 cgc.quiet = 1;
2092
2093 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
2094 return ret;
2095
2096 buf[pd->mode_offset + 10] |= (!!set << 2);
2097
2098 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
2099 ret = pkt_mode_select(pd, &cgc);
2100 if (ret) {
2101 printk(DRIVER_NAME": write caching control failed\n");
2102 pkt_dump_sense(&cgc);
2103 } else if (!ret && set)
2104 printk(DRIVER_NAME": enabled write caching on %s\n", pd->name);
2105 return ret;
2106 }
2107
2108 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
2109 {
2110 struct packet_command cgc;
2111
2112 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2113 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
2114 cgc.cmd[4] = lockflag ? 1 : 0;
2115 return pkt_generic_packet(pd, &cgc);
2116 }
2117
2118 /*
2119 * Returns drive maximum write speed
2120 */
2121 static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
2122 unsigned *write_speed)
2123 {
2124 struct packet_command cgc;
2125 struct request_sense sense;
2126 unsigned char buf[256+18];
2127 unsigned char *cap_buf;
2128 int ret, offset;
2129
2130 memset(buf, 0, sizeof(buf));
2131 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
2132 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
2133 cgc.sense = &sense;
2134
2135 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2136 if (ret) {
2137 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
2138 sizeof(struct mode_page_header);
2139 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2140 if (ret) {
2141 pkt_dump_sense(&cgc);
2142 return ret;
2143 }
2144 }
2145
2146 offset = 20; /* Obsoleted field, used by older drives */
2147 if (cap_buf[1] >= 28)
2148 offset = 28; /* Current write speed selected */
2149 if (cap_buf[1] >= 30) {
2150 /* If the drive reports at least one "Logical Unit Write
2151 * Speed Performance Descriptor Block", use the information
2152 * in the first block. (contains the highest speed)
2153 */
2154 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
2155 if (num_spdb > 0)
2156 offset = 34;
2157 }
2158
2159 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
2160 return 0;
2161 }
2162
2163 /* These tables from cdrecord - I don't have orange book */
2164 /* standard speed CD-RW (1-4x) */
2165 static char clv_to_speed[16] = {
2166 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2167 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2168 };
2169 /* high speed CD-RW (-10x) */
2170 static char hs_clv_to_speed[16] = {
2171 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2172 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2173 };
2174 /* ultra high speed CD-RW */
2175 static char us_clv_to_speed[16] = {
2176 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2177 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2178 };
2179
2180 /*
2181 * reads the maximum media speed from ATIP
2182 */
2183 static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
2184 unsigned *speed)
2185 {
2186 struct packet_command cgc;
2187 struct request_sense sense;
2188 unsigned char buf[64];
2189 unsigned int size, st, sp;
2190 int ret;
2191
2192 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2193 cgc.sense = &sense;
2194 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2195 cgc.cmd[1] = 2;
2196 cgc.cmd[2] = 4; /* READ ATIP */
2197 cgc.cmd[8] = 2;
2198 ret = pkt_generic_packet(pd, &cgc);
2199 if (ret) {
2200 pkt_dump_sense(&cgc);
2201 return ret;
2202 }
2203 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2204 if (size > sizeof(buf))
2205 size = sizeof(buf);
2206
2207 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2208 cgc.sense = &sense;
2209 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2210 cgc.cmd[1] = 2;
2211 cgc.cmd[2] = 4;
2212 cgc.cmd[8] = size;
2213 ret = pkt_generic_packet(pd, &cgc);
2214 if (ret) {
2215 pkt_dump_sense(&cgc);
2216 return ret;
2217 }
2218
2219 if (!(buf[6] & 0x40)) {
2220 printk(DRIVER_NAME": Disc type is not CD-RW\n");
2221 return 1;
2222 }
2223 if (!(buf[6] & 0x4)) {
2224 printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n");
2225 return 1;
2226 }
2227
2228 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2229
2230 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2231
2232 /* Info from cdrecord */
2233 switch (st) {
2234 case 0: /* standard speed */
2235 *speed = clv_to_speed[sp];
2236 break;
2237 case 1: /* high speed */
2238 *speed = hs_clv_to_speed[sp];
2239 break;
2240 case 2: /* ultra high speed */
2241 *speed = us_clv_to_speed[sp];
2242 break;
2243 default:
2244 printk(DRIVER_NAME": Unknown disc sub-type %d\n",st);
2245 return 1;
2246 }
2247 if (*speed) {
2248 printk(DRIVER_NAME": Max. media speed: %d\n",*speed);
2249 return 0;
2250 } else {
2251 printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st);
2252 return 1;
2253 }
2254 }
2255
2256 static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
2257 {
2258 struct packet_command cgc;
2259 struct request_sense sense;
2260 int ret;
2261
2262 VPRINTK(DRIVER_NAME": Performing OPC\n");
2263
2264 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2265 cgc.sense = &sense;
2266 cgc.timeout = 60*HZ;
2267 cgc.cmd[0] = GPCMD_SEND_OPC;
2268 cgc.cmd[1] = 1;
2269 if ((ret = pkt_generic_packet(pd, &cgc)))
2270 pkt_dump_sense(&cgc);
2271 return ret;
2272 }
2273
2274 static int pkt_open_write(struct pktcdvd_device *pd)
2275 {
2276 int ret;
2277 unsigned int write_speed, media_write_speed, read_speed;
2278
2279 if ((ret = pkt_probe_settings(pd))) {
2280 VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name);
2281 return ret;
2282 }
2283
2284 if ((ret = pkt_set_write_settings(pd))) {
2285 DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name);
2286 return -EIO;
2287 }
2288
2289 pkt_write_caching(pd, USE_WCACHING);
2290
2291 if ((ret = pkt_get_max_speed(pd, &write_speed)))
2292 write_speed = 16 * 177;
2293 switch (pd->mmc3_profile) {
2294 case 0x13: /* DVD-RW */
2295 case 0x1a: /* DVD+RW */
2296 case 0x12: /* DVD-RAM */
2297 DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed);
2298 break;
2299 default:
2300 if ((ret = pkt_media_speed(pd, &media_write_speed)))
2301 media_write_speed = 16;
2302 write_speed = min(write_speed, media_write_speed * 177);
2303 DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176);
2304 break;
2305 }
2306 read_speed = write_speed;
2307
2308 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
2309 DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name);
2310 return -EIO;
2311 }
2312 pd->write_speed = write_speed;
2313 pd->read_speed = read_speed;
2314
2315 if ((ret = pkt_perform_opc(pd))) {
2316 DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name);
2317 }
2318
2319 return 0;
2320 }
2321
2322 /*
2323 * called at open time.
2324 */
2325 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
2326 {
2327 int ret;
2328 long lba;
2329 struct request_queue *q;
2330
2331 /*
2332 * We need to re-open the cdrom device without O_NONBLOCK to be able
2333 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2334 * so bdget() can't fail.
2335 */
2336 bdget(pd->bdev->bd_dev);
2337 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
2338 goto out;
2339
2340 if ((ret = bd_claim(pd->bdev, pd)))
2341 goto out_putdev;
2342
2343 if ((ret = pkt_get_last_written(pd, &lba))) {
2344 printk(DRIVER_NAME": pkt_get_last_written failed\n");
2345 goto out_unclaim;
2346 }
2347
2348 set_capacity(pd->disk, lba << 2);
2349 set_capacity(pd->bdev->bd_disk, lba << 2);
2350 bd_set_size(pd->bdev, (loff_t)lba << 11);
2351
2352 q = bdev_get_queue(pd->bdev);
2353 if (write) {
2354 if ((ret = pkt_open_write(pd)))
2355 goto out_unclaim;
2356 /*
2357 * Some CDRW drives can not handle writes larger than one packet,
2358 * even if the size is a multiple of the packet size.
2359 */
2360 spin_lock_irq(q->queue_lock);
2361 blk_queue_max_sectors(q, pd->settings.size);
2362 spin_unlock_irq(q->queue_lock);
2363 set_bit(PACKET_WRITABLE, &pd->flags);
2364 } else {
2365 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2366 clear_bit(PACKET_WRITABLE, &pd->flags);
2367 }
2368
2369 if ((ret = pkt_set_segment_merging(pd, q)))
2370 goto out_unclaim;
2371
2372 if (write) {
2373 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2374 printk(DRIVER_NAME": not enough memory for buffers\n");
2375 ret = -ENOMEM;
2376 goto out_unclaim;
2377 }
2378 printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
2379 }
2380
2381 return 0;
2382
2383 out_unclaim:
2384 bd_release(pd->bdev);
2385 out_putdev:
2386 blkdev_put(pd->bdev);
2387 out:
2388 return ret;
2389 }
2390
2391 /*
2392 * called when the device is closed. makes sure that the device flushes
2393 * the internal cache before we close.
2394 */
2395 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2396 {
2397 if (flush && pkt_flush_cache(pd))
2398 DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name);
2399
2400 pkt_lock_door(pd, 0);
2401
2402 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2403 bd_release(pd->bdev);
2404 blkdev_put(pd->bdev);
2405
2406 pkt_shrink_pktlist(pd);
2407 }
2408
2409 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2410 {
2411 if (dev_minor >= MAX_WRITERS)
2412 return NULL;
2413 return pkt_devs[dev_minor];
2414 }
2415
2416 static int pkt_open(struct inode *inode, struct file *file)
2417 {
2418 struct pktcdvd_device *pd = NULL;
2419 int ret;
2420
2421 VPRINTK(DRIVER_NAME": entering open\n");
2422
2423 mutex_lock(&ctl_mutex);
2424 pd = pkt_find_dev_from_minor(iminor(inode));
2425 if (!pd) {
2426 ret = -ENODEV;
2427 goto out;
2428 }
2429 BUG_ON(pd->refcnt < 0);
2430
2431 pd->refcnt++;
2432 if (pd->refcnt > 1) {
2433 if ((file->f_mode & FMODE_WRITE) &&
2434 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2435 ret = -EBUSY;
2436 goto out_dec;
2437 }
2438 } else {
2439 ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE);
2440 if (ret)
2441 goto out_dec;
2442 /*
2443 * needed here as well, since ext2 (among others) may change
2444 * the blocksize at mount time
2445 */
2446 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2447 }
2448
2449 mutex_unlock(&ctl_mutex);
2450 return 0;
2451
2452 out_dec:
2453 pd->refcnt--;
2454 out:
2455 VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
2456 mutex_unlock(&ctl_mutex);
2457 return ret;
2458 }
2459
2460 static int pkt_close(struct inode *inode, struct file *file)
2461 {
2462 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2463 int ret = 0;
2464
2465 mutex_lock(&ctl_mutex);
2466 pd->refcnt--;
2467 BUG_ON(pd->refcnt < 0);
2468 if (pd->refcnt == 0) {
2469 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2470 pkt_release_dev(pd, flush);
2471 }
2472 mutex_unlock(&ctl_mutex);
2473 return ret;
2474 }
2475
2476
2477 static void pkt_end_io_read_cloned(struct bio *bio, int err)
2478 {
2479 struct packet_stacked_data *psd = bio->bi_private;
2480 struct pktcdvd_device *pd = psd->pd;
2481
2482 bio_put(bio);
2483 bio_endio(psd->bio, err);
2484 mempool_free(psd, psd_pool);
2485 pkt_bio_finished(pd);
2486 }
2487
2488 static int pkt_make_request(struct request_queue *q, struct bio *bio)
2489 {
2490 struct pktcdvd_device *pd;
2491 char b[BDEVNAME_SIZE];
2492 sector_t zone;
2493 struct packet_data *pkt;
2494 int was_empty, blocked_bio;
2495 struct pkt_rb_node *node;
2496
2497 pd = q->queuedata;
2498 if (!pd) {
2499 printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2500 goto end_io;
2501 }
2502
2503 /*
2504 * Clone READ bios so we can have our own bi_end_io callback.
2505 */
2506 if (bio_data_dir(bio) == READ) {
2507 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2508 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2509
2510 psd->pd = pd;
2511 psd->bio = bio;
2512 cloned_bio->bi_bdev = pd->bdev;
2513 cloned_bio->bi_private = psd;
2514 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2515 pd->stats.secs_r += bio->bi_size >> 9;
2516 pkt_queue_bio(pd, cloned_bio);
2517 return 0;
2518 }
2519
2520 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2521 printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n",
2522 pd->name, (unsigned long long)bio->bi_sector);
2523 goto end_io;
2524 }
2525
2526 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2527 printk(DRIVER_NAME": wrong bio size\n");
2528 goto end_io;
2529 }
2530
2531 blk_queue_bounce(q, &bio);
2532
2533 zone = ZONE(bio->bi_sector, pd);
2534 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2535 (unsigned long long)bio->bi_sector,
2536 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2537
2538 /* Check if we have to split the bio */
2539 {
2540 struct bio_pair *bp;
2541 sector_t last_zone;
2542 int first_sectors;
2543
2544 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2545 if (last_zone != zone) {
2546 BUG_ON(last_zone != zone + pd->settings.size);
2547 first_sectors = last_zone - bio->bi_sector;
2548 bp = bio_split(bio, bio_split_pool, first_sectors);
2549 BUG_ON(!bp);
2550 pkt_make_request(q, &bp->bio1);
2551 pkt_make_request(q, &bp->bio2);
2552 bio_pair_release(bp);
2553 return 0;
2554 }
2555 }
2556
2557 /*
2558 * If we find a matching packet in state WAITING or READ_WAIT, we can
2559 * just append this bio to that packet.
2560 */
2561 spin_lock(&pd->cdrw.active_list_lock);
2562 blocked_bio = 0;
2563 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2564 if (pkt->sector == zone) {
2565 spin_lock(&pkt->lock);
2566 if ((pkt->state == PACKET_WAITING_STATE) ||
2567 (pkt->state == PACKET_READ_WAIT_STATE)) {
2568 pkt_add_list_last(bio, &pkt->orig_bios,
2569 &pkt->orig_bios_tail);
2570 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2571 if ((pkt->write_size >= pkt->frames) &&
2572 (pkt->state == PACKET_WAITING_STATE)) {
2573 atomic_inc(&pkt->run_sm);
2574 wake_up(&pd->wqueue);
2575 }
2576 spin_unlock(&pkt->lock);
2577 spin_unlock(&pd->cdrw.active_list_lock);
2578 return 0;
2579 } else {
2580 blocked_bio = 1;
2581 }
2582 spin_unlock(&pkt->lock);
2583 }
2584 }
2585 spin_unlock(&pd->cdrw.active_list_lock);
2586
2587 /*
2588 * Test if there is enough room left in the bio work queue
2589 * (queue size >= congestion on mark).
2590 * If not, wait till the work queue size is below the congestion off mark.
2591 */
2592 spin_lock(&pd->lock);
2593 if (pd->write_congestion_on > 0
2594 && pd->bio_queue_size >= pd->write_congestion_on) {
2595 set_bdi_congested(&q->backing_dev_info, WRITE);
2596 do {
2597 spin_unlock(&pd->lock);
2598 congestion_wait(WRITE, HZ);
2599 spin_lock(&pd->lock);
2600 } while(pd->bio_queue_size > pd->write_congestion_off);
2601 }
2602 spin_unlock(&pd->lock);
2603
2604 /*
2605 * No matching packet found. Store the bio in the work queue.
2606 */
2607 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2608 node->bio = bio;
2609 spin_lock(&pd->lock);
2610 BUG_ON(pd->bio_queue_size < 0);
2611 was_empty = (pd->bio_queue_size == 0);
2612 pkt_rbtree_insert(pd, node);
2613 spin_unlock(&pd->lock);
2614
2615 /*
2616 * Wake up the worker thread.
2617 */
2618 atomic_set(&pd->scan_queue, 1);
2619 if (was_empty) {
2620 /* This wake_up is required for correct operation */
2621 wake_up(&pd->wqueue);
2622 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2623 /*
2624 * This wake up is not required for correct operation,
2625 * but improves performance in some cases.
2626 */
2627 wake_up(&pd->wqueue);
2628 }
2629 return 0;
2630 end_io:
2631 bio_io_error(bio);
2632 return 0;
2633 }
2634
2635
2636
2637 static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
2638 struct bio_vec *bvec)
2639 {
2640 struct pktcdvd_device *pd = q->queuedata;
2641 sector_t zone = ZONE(bmd->bi_sector, pd);
2642 int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size;
2643 int remaining = (pd->settings.size << 9) - used;
2644 int remaining2;
2645
2646 /*
2647 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2648 * boundary, pkt_make_request() will split the bio.
2649 */
2650 remaining2 = PAGE_SIZE - bmd->bi_size;
2651 remaining = max(remaining, remaining2);
2652
2653 BUG_ON(remaining < 0);
2654 return remaining;
2655 }
2656
2657 static void pkt_init_queue(struct pktcdvd_device *pd)
2658 {
2659 struct request_queue *q = pd->disk->queue;
2660
2661 blk_queue_make_request(q, pkt_make_request);
2662 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2663 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2664 blk_queue_merge_bvec(q, pkt_merge_bvec);
2665 q->queuedata = pd;
2666 }
2667
2668 static int pkt_seq_show(struct seq_file *m, void *p)
2669 {
2670 struct pktcdvd_device *pd = m->private;
2671 char *msg;
2672 char bdev_buf[BDEVNAME_SIZE];
2673 int states[PACKET_NUM_STATES];
2674
2675 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2676 bdevname(pd->bdev, bdev_buf));
2677
2678 seq_printf(m, "\nSettings:\n");
2679 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2680
2681 if (pd->settings.write_type == 0)
2682 msg = "Packet";
2683 else
2684 msg = "Unknown";
2685 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2686
2687 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2688 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2689
2690 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2691
2692 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2693 msg = "Mode 1";
2694 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2695 msg = "Mode 2";
2696 else
2697 msg = "Unknown";
2698 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2699
2700 seq_printf(m, "\nStatistics:\n");
2701 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2702 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2703 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2704 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2705 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2706
2707 seq_printf(m, "\nMisc:\n");
2708 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2709 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2710 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2711 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2712 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2713 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2714
2715 seq_printf(m, "\nQueue state:\n");
2716 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2717 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2718 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2719
2720 pkt_count_states(pd, states);
2721 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2722 states[0], states[1], states[2], states[3], states[4], states[5]);
2723
2724 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2725 pd->write_congestion_off,
2726 pd->write_congestion_on);
2727 return 0;
2728 }
2729
2730 static int pkt_seq_open(struct inode *inode, struct file *file)
2731 {
2732 return single_open(file, pkt_seq_show, PDE(inode)->data);
2733 }
2734
2735 static const struct file_operations pkt_proc_fops = {
2736 .open = pkt_seq_open,
2737 .read = seq_read,
2738 .llseek = seq_lseek,
2739 .release = single_release
2740 };
2741
2742 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2743 {
2744 int i;
2745 int ret = 0;
2746 char b[BDEVNAME_SIZE];
2747 struct block_device *bdev;
2748
2749 if (pd->pkt_dev == dev) {
2750 printk(DRIVER_NAME": Recursive setup not allowed\n");
2751 return -EBUSY;
2752 }
2753 for (i = 0; i < MAX_WRITERS; i++) {
2754 struct pktcdvd_device *pd2 = pkt_devs[i];
2755 if (!pd2)
2756 continue;
2757 if (pd2->bdev->bd_dev == dev) {
2758 printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b));
2759 return -EBUSY;
2760 }
2761 if (pd2->pkt_dev == dev) {
2762 printk(DRIVER_NAME": Can't chain pktcdvd devices\n");
2763 return -EBUSY;
2764 }
2765 }
2766
2767 bdev = bdget(dev);
2768 if (!bdev)
2769 return -ENOMEM;
2770 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2771 if (ret)
2772 return ret;
2773
2774 /* This is safe, since we have a reference from open(). */
2775 __module_get(THIS_MODULE);
2776
2777 pd->bdev = bdev;
2778 set_blocksize(bdev, CD_FRAMESIZE);
2779
2780 pkt_init_queue(pd);
2781
2782 atomic_set(&pd->cdrw.pending_bios, 0);
2783 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2784 if (IS_ERR(pd->cdrw.thread)) {
2785 printk(DRIVER_NAME": can't start kernel thread\n");
2786 ret = -ENOMEM;
2787 goto out_mem;
2788 }
2789
2790 proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd);
2791 DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2792 return 0;
2793
2794 out_mem:
2795 blkdev_put(bdev);
2796 /* This is safe: open() is still holding a reference. */
2797 module_put(THIS_MODULE);
2798 return ret;
2799 }
2800
2801 static long pkt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2802 {
2803 struct inode *inode = file->f_path.dentry->d_inode;
2804 struct pktcdvd_device *pd;
2805 long ret;
2806
2807 lock_kernel();
2808 pd = inode->i_bdev->bd_disk->private_data;
2809
2810 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2811
2812 switch (cmd) {
2813 /*
2814 * forward selected CDROM ioctls to CD-ROM, for UDF
2815 */
2816 case CDROMMULTISESSION:
2817 case CDROMREADTOCENTRY:
2818 case CDROM_LAST_WRITTEN:
2819 case CDROM_SEND_PACKET:
2820 case SCSI_IOCTL_SEND_COMMAND:
2821 ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2822 break;
2823
2824 case CDROMEJECT:
2825 /*
2826 * The door gets locked when the device is opened, so we
2827 * have to unlock it or else the eject command fails.
2828 */
2829 if (pd->refcnt == 1)
2830 pkt_lock_door(pd, 0);
2831 ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2832 break;
2833
2834 default:
2835 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
2836 ret = -ENOTTY;
2837 }
2838 unlock_kernel();
2839 return ret;
2840 }
2841
2842 static int pkt_media_changed(struct gendisk *disk)
2843 {
2844 struct pktcdvd_device *pd = disk->private_data;
2845 struct gendisk *attached_disk;
2846
2847 if (!pd)
2848 return 0;
2849 if (!pd->bdev)
2850 return 0;
2851 attached_disk = pd->bdev->bd_disk;
2852 if (!attached_disk)
2853 return 0;
2854 return attached_disk->fops->media_changed(attached_disk);
2855 }
2856
2857 static struct block_device_operations pktcdvd_ops = {
2858 .owner = THIS_MODULE,
2859 .open = pkt_open,
2860 .release = pkt_close,
2861 .unlocked_ioctl = pkt_ioctl,
2862 .media_changed = pkt_media_changed,
2863 };
2864
2865 /*
2866 * Set up mapping from pktcdvd device to CD-ROM device.
2867 */
2868 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
2869 {
2870 int idx;
2871 int ret = -ENOMEM;
2872 struct pktcdvd_device *pd;
2873 struct gendisk *disk;
2874
2875 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2876
2877 for (idx = 0; idx < MAX_WRITERS; idx++)
2878 if (!pkt_devs[idx])
2879 break;
2880 if (idx == MAX_WRITERS) {
2881 printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS);
2882 ret = -EBUSY;
2883 goto out_mutex;
2884 }
2885
2886 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2887 if (!pd)
2888 goto out_mutex;
2889
2890 pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
2891 sizeof(struct pkt_rb_node));
2892 if (!pd->rb_pool)
2893 goto out_mem;
2894
2895 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2896 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2897 spin_lock_init(&pd->cdrw.active_list_lock);
2898
2899 spin_lock_init(&pd->lock);
2900 spin_lock_init(&pd->iosched.lock);
2901 sprintf(pd->name, DRIVER_NAME"%d", idx);
2902 init_waitqueue_head(&pd->wqueue);
2903 pd->bio_queue = RB_ROOT;
2904
2905 pd->write_congestion_on = write_congestion_on;
2906 pd->write_congestion_off = write_congestion_off;
2907
2908 disk = alloc_disk(1);
2909 if (!disk)
2910 goto out_mem;
2911 pd->disk = disk;
2912 disk->major = pktdev_major;
2913 disk->first_minor = idx;
2914 disk->fops = &pktcdvd_ops;
2915 disk->flags = GENHD_FL_REMOVABLE;
2916 strcpy(disk->disk_name, pd->name);
2917 disk->private_data = pd;
2918 disk->queue = blk_alloc_queue(GFP_KERNEL);
2919 if (!disk->queue)
2920 goto out_mem2;
2921
2922 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2923 ret = pkt_new_dev(pd, dev);
2924 if (ret)
2925 goto out_new_dev;
2926
2927 add_disk(disk);
2928
2929 pkt_sysfs_dev_new(pd);
2930 pkt_debugfs_dev_new(pd);
2931
2932 pkt_devs[idx] = pd;
2933 if (pkt_dev)
2934 *pkt_dev = pd->pkt_dev;
2935
2936 mutex_unlock(&ctl_mutex);
2937 return 0;
2938
2939 out_new_dev:
2940 blk_cleanup_queue(disk->queue);
2941 out_mem2:
2942 put_disk(disk);
2943 out_mem:
2944 if (pd->rb_pool)
2945 mempool_destroy(pd->rb_pool);
2946 kfree(pd);
2947 out_mutex:
2948 mutex_unlock(&ctl_mutex);
2949 printk(DRIVER_NAME": setup of pktcdvd device failed\n");
2950 return ret;
2951 }
2952
2953 /*
2954 * Tear down mapping from pktcdvd device to CD-ROM device.
2955 */
2956 static int pkt_remove_dev(dev_t pkt_dev)
2957 {
2958 struct pktcdvd_device *pd;
2959 int idx;
2960 int ret = 0;
2961
2962 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2963
2964 for (idx = 0; idx < MAX_WRITERS; idx++) {
2965 pd = pkt_devs[idx];
2966 if (pd && (pd->pkt_dev == pkt_dev))
2967 break;
2968 }
2969 if (idx == MAX_WRITERS) {
2970 DPRINTK(DRIVER_NAME": dev not setup\n");
2971 ret = -ENXIO;
2972 goto out;
2973 }
2974
2975 if (pd->refcnt > 0) {
2976 ret = -EBUSY;
2977 goto out;
2978 }
2979 if (!IS_ERR(pd->cdrw.thread))
2980 kthread_stop(pd->cdrw.thread);
2981
2982 pkt_devs[idx] = NULL;
2983
2984 pkt_debugfs_dev_remove(pd);
2985 pkt_sysfs_dev_remove(pd);
2986
2987 blkdev_put(pd->bdev);
2988
2989 remove_proc_entry(pd->name, pkt_proc);
2990 DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name);
2991
2992 del_gendisk(pd->disk);
2993 blk_cleanup_queue(pd->disk->queue);
2994 put_disk(pd->disk);
2995
2996 mempool_destroy(pd->rb_pool);
2997 kfree(pd);
2998
2999 /* This is safe: open() is still holding a reference. */
3000 module_put(THIS_MODULE);
3001
3002 out:
3003 mutex_unlock(&ctl_mutex);
3004 return ret;
3005 }
3006
3007 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
3008 {
3009 struct pktcdvd_device *pd;
3010
3011 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
3012
3013 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
3014 if (pd) {
3015 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
3016 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
3017 } else {
3018 ctrl_cmd->dev = 0;
3019 ctrl_cmd->pkt_dev = 0;
3020 }
3021 ctrl_cmd->num_devices = MAX_WRITERS;
3022
3023 mutex_unlock(&ctl_mutex);
3024 }
3025
3026 static long pkt_ctl_ioctl(struct file *file, unsigned int cmd,
3027 unsigned long arg)
3028 {
3029 void __user *argp = (void __user *)arg;
3030 struct pkt_ctrl_command ctrl_cmd;
3031 int ret = 0;
3032 dev_t pkt_dev = 0;
3033
3034 if (cmd != PACKET_CTRL_CMD)
3035 return -ENOTTY;
3036
3037 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
3038 return -EFAULT;
3039
3040 switch (ctrl_cmd.command) {
3041 case PKT_CTRL_CMD_SETUP:
3042 if (!capable(CAP_SYS_ADMIN))
3043 return -EPERM;
3044 lock_kernel();
3045 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
3046 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
3047 unlock_kernel();
3048 break;
3049 case PKT_CTRL_CMD_TEARDOWN:
3050 if (!capable(CAP_SYS_ADMIN))
3051 return -EPERM;
3052 lock_kernel();
3053 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
3054 unlock_kernel();
3055 break;
3056 case PKT_CTRL_CMD_STATUS:
3057 lock_kernel();
3058 pkt_get_status(&ctrl_cmd);
3059 unlock_kernel();
3060 break;
3061 default:
3062 return -ENOTTY;
3063 }
3064
3065 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
3066 return -EFAULT;
3067 return ret;
3068 }
3069
3070
3071 static const struct file_operations pkt_ctl_fops = {
3072 .unlocked_ioctl = pkt_ctl_ioctl,
3073 .owner = THIS_MODULE,
3074 };
3075
3076 static struct miscdevice pkt_misc = {
3077 .minor = MISC_DYNAMIC_MINOR,
3078 .name = DRIVER_NAME,
3079 .fops = &pkt_ctl_fops
3080 };
3081
3082 static int __init pkt_init(void)
3083 {
3084 int ret;
3085
3086 mutex_init(&ctl_mutex);
3087
3088 psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
3089 sizeof(struct packet_stacked_data));
3090 if (!psd_pool)
3091 return -ENOMEM;
3092
3093 ret = register_blkdev(pktdev_major, DRIVER_NAME);
3094 if (ret < 0) {
3095 printk(DRIVER_NAME": Unable to register block device\n");
3096 goto out2;
3097 }
3098 if (!pktdev_major)
3099 pktdev_major = ret;
3100
3101 ret = pkt_sysfs_init();
3102 if (ret)
3103 goto out;
3104
3105 pkt_debugfs_init();
3106
3107 ret = misc_register(&pkt_misc);
3108 if (ret) {
3109 printk(DRIVER_NAME": Unable to register misc device\n");
3110 goto out_misc;
3111 }
3112
3113 pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
3114
3115 return 0;
3116
3117 out_misc:
3118 pkt_debugfs_cleanup();
3119 pkt_sysfs_cleanup();
3120 out:
3121 unregister_blkdev(pktdev_major, DRIVER_NAME);
3122 out2:
3123 mempool_destroy(psd_pool);
3124 return ret;
3125 }
3126
3127 static void __exit pkt_exit(void)
3128 {
3129 remove_proc_entry("driver/"DRIVER_NAME, NULL);
3130 misc_deregister(&pkt_misc);
3131
3132 pkt_debugfs_cleanup();
3133 pkt_sysfs_cleanup();
3134
3135 unregister_blkdev(pktdev_major, DRIVER_NAME);
3136 mempool_destroy(psd_pool);
3137 }
3138
3139 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3140 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3141 MODULE_LICENSE("GPL");
3142
3143 module_init(pkt_init);
3144 module_exit(pkt_exit);
Support for the Chinese Samsung S3C2440 based development boards