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shmem: new export ops
[linux-2.6/linux-trees-mm.git] / drivers / block / pktcdvd.c
bloba8130a4ad6d4329572b722b2947059db776fa8e2
1 /*
2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
4 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
5 *
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
8 *
9 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
10 * DVD-RAM devices.
11 *
12 * Theory of operation:
13 *
14 * At the lowest level, there is the standard driver for the CD/DVD device,
15 * typically ide-cd.c or sr.c. This driver can handle read and write requests,
16 * but it doesn't know anything about the special restrictions that apply to
17 * packet writing. One restriction is that write requests must be aligned to
18 * packet boundaries on the physical media, and the size of a write request
19 * must be equal to the packet size. Another restriction is that a
20 * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read
21 * command, if the previous command was a write.
22 *
23 * The purpose of the packet writing driver is to hide these restrictions from
24 * higher layers, such as file systems, and present a block device that can be
25 * randomly read and written using 2kB-sized blocks.
26 *
27 * The lowest layer in the packet writing driver is the packet I/O scheduler.
28 * Its data is defined by the struct packet_iosched and includes two bio
29 * queues with pending read and write requests. These queues are processed
30 * by the pkt_iosched_process_queue() function. The write requests in this
31 * queue are already properly aligned and sized. This layer is responsible for
32 * issuing the flush cache commands and scheduling the I/O in a good order.
33 *
34 * The next layer transforms unaligned write requests to aligned writes. This
35 * transformation requires reading missing pieces of data from the underlying
36 * block device, assembling the pieces to full packets and queuing them to the
37 * packet I/O scheduler.
38 *
39 * At the top layer there is a custom make_request_fn function that forwards
40 * read requests directly to the iosched queue and puts write requests in the
41 * unaligned write queue. A kernel thread performs the necessary read
42 * gathering to convert the unaligned writes to aligned writes and then feeds
43 * them to the packet I/O scheduler.
44 *
45 *************************************************************************/
46
47 #include <linux/pktcdvd.h>
48 #include <linux/module.h>
49 #include <linux/types.h>
50 #include <linux/kernel.h>
51 #include <linux/kthread.h>
52 #include <linux/errno.h>
53 #include <linux/spinlock.h>
54 #include <linux/file.h>
55 #include <linux/proc_fs.h>
56 #include <linux/seq_file.h>
57 #include <linux/miscdevice.h>
58 #include <linux/freezer.h>
59 #include <linux/mutex.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_ioctl.h>
62 #include <scsi/scsi.h>
63 #include <linux/debugfs.h>
64 #include <linux/device.h>
65
66 #include <asm/uaccess.h>
67
68 #define DRIVER_NAME "pktcdvd"
69
70 #if PACKET_DEBUG
71 #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
72 #else
73 #define DPRINTK(fmt, args...)
74 #endif
75
76 #if PACKET_DEBUG > 1
77 #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args)
78 #else
79 #define VPRINTK(fmt, args...)
80 #endif
81
82 #define MAX_SPEED 0xffff
83
84 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
85
86 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
87 static struct proc_dir_entry *pkt_proc;
88 static int pktdev_major;
89 static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
90 static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
91 static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
92 static mempool_t *psd_pool;
93
94 static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
95 static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */
96
97 /* forward declaration */
98 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
99 static int pkt_remove_dev(dev_t pkt_dev);
100 static int pkt_seq_show(struct seq_file *m, void *p);
101
102
103
104 /*
105 * create and register a pktcdvd kernel object.
106 */
107 static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd,
108 const char* name,
109 struct kobject* parent,
110 struct kobj_type* ktype)
111 {
112 struct pktcdvd_kobj *p;
113 p = kzalloc(sizeof(*p), GFP_KERNEL);
114 if (!p)
115 return NULL;
116 kobject_set_name(&p->kobj, "%s", name);
117 p->kobj.parent = parent;
118 p->kobj.ktype = ktype;
119 p->pd = pd;
120 if (kobject_register(&p->kobj) != 0)
121 return NULL;
122 return p;
123 }
124 /*
125 * remove a pktcdvd kernel object.
126 */
127 static void pkt_kobj_remove(struct pktcdvd_kobj *p)
128 {
129 if (p)
130 kobject_unregister(&p->kobj);
131 }
132 /*
133 * default release function for pktcdvd kernel objects.
134 */
135 static void pkt_kobj_release(struct kobject *kobj)
136 {
137 kfree(to_pktcdvdkobj(kobj));
138 }
139
140
141 /**********************************************************
142 *
143 * sysfs interface for pktcdvd
144 * by (C) 2006 Thomas Maier <balagi@justmail.de>
145 *
146 **********************************************************/
147
148 #define DEF_ATTR(_obj,_name,_mode) \
149 static struct attribute _obj = { .name = _name, .mode = _mode }
150
151 /**********************************************************
152 /sys/class/pktcdvd/pktcdvd[0-7]/
153 stat/reset
154 stat/packets_started
155 stat/packets_finished
156 stat/kb_written
157 stat/kb_read
158 stat/kb_read_gather
159 write_queue/size
160 write_queue/congestion_off
161 write_queue/congestion_on
162 **********************************************************/
163
164 DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
165 DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
166 DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
167 DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
168 DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
169 DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
170
171 static struct attribute *kobj_pkt_attrs_stat[] = {
172 &kobj_pkt_attr_st1,
173 &kobj_pkt_attr_st2,
174 &kobj_pkt_attr_st3,
175 &kobj_pkt_attr_st4,
176 &kobj_pkt_attr_st5,
177 &kobj_pkt_attr_st6,
178 NULL
179 };
180
181 DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
182 DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
183 DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
184
185 static struct attribute *kobj_pkt_attrs_wqueue[] = {
186 &kobj_pkt_attr_wq1,
187 &kobj_pkt_attr_wq2,
188 &kobj_pkt_attr_wq3,
189 NULL
190 };
191
192 static ssize_t kobj_pkt_show(struct kobject *kobj,
193 struct attribute *attr, char *data)
194 {
195 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
196 int n = 0;
197 int v;
198 if (strcmp(attr->name, "packets_started") == 0) {
199 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
200
201 } else if (strcmp(attr->name, "packets_finished") == 0) {
202 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
203
204 } else if (strcmp(attr->name, "kb_written") == 0) {
205 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
206
207 } else if (strcmp(attr->name, "kb_read") == 0) {
208 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
209
210 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
211 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
212
213 } else if (strcmp(attr->name, "size") == 0) {
214 spin_lock(&pd->lock);
215 v = pd->bio_queue_size;
216 spin_unlock(&pd->lock);
217 n = sprintf(data, "%d\n", v);
218
219 } else if (strcmp(attr->name, "congestion_off") == 0) {
220 spin_lock(&pd->lock);
221 v = pd->write_congestion_off;
222 spin_unlock(&pd->lock);
223 n = sprintf(data, "%d\n", v);
224
225 } else if (strcmp(attr->name, "congestion_on") == 0) {
226 spin_lock(&pd->lock);
227 v = pd->write_congestion_on;
228 spin_unlock(&pd->lock);
229 n = sprintf(data, "%d\n", v);
230 }
231 return n;
232 }
233
234 static void init_write_congestion_marks(int* lo, int* hi)
235 {
236 if (*hi > 0) {
237 *hi = max(*hi, 500);
238 *hi = min(*hi, 1000000);
239 if (*lo <= 0)
240 *lo = *hi - 100;
241 else {
242 *lo = min(*lo, *hi - 100);
243 *lo = max(*lo, 100);
244 }
245 } else {
246 *hi = -1;
247 *lo = -1;
248 }
249 }
250
251 static ssize_t kobj_pkt_store(struct kobject *kobj,
252 struct attribute *attr,
253 const char *data, size_t len)
254 {
255 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
256 int val;
257
258 if (strcmp(attr->name, "reset") == 0 && len > 0) {
259 pd->stats.pkt_started = 0;
260 pd->stats.pkt_ended = 0;
261 pd->stats.secs_w = 0;
262 pd->stats.secs_rg = 0;
263 pd->stats.secs_r = 0;
264
265 } else if (strcmp(attr->name, "congestion_off") == 0
266 && sscanf(data, "%d", &val) == 1) {
267 spin_lock(&pd->lock);
268 pd->write_congestion_off = val;
269 init_write_congestion_marks(&pd->write_congestion_off,
270 &pd->write_congestion_on);
271 spin_unlock(&pd->lock);
272
273 } else if (strcmp(attr->name, "congestion_on") == 0
274 && sscanf(data, "%d", &val) == 1) {
275 spin_lock(&pd->lock);
276 pd->write_congestion_on = val;
277 init_write_congestion_marks(&pd->write_congestion_off,
278 &pd->write_congestion_on);
279 spin_unlock(&pd->lock);
280 }
281 return len;
282 }
283
284 static struct sysfs_ops kobj_pkt_ops = {
285 .show = kobj_pkt_show,
286 .store = kobj_pkt_store
287 };
288 static struct kobj_type kobj_pkt_type_stat = {
289 .release = pkt_kobj_release,
290 .sysfs_ops = &kobj_pkt_ops,
291 .default_attrs = kobj_pkt_attrs_stat
292 };
293 static struct kobj_type kobj_pkt_type_wqueue = {
294 .release = pkt_kobj_release,
295 .sysfs_ops = &kobj_pkt_ops,
296 .default_attrs = kobj_pkt_attrs_wqueue
297 };
298
299 static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
300 {
301 if (class_pktcdvd) {
302 pd->clsdev = class_device_create(class_pktcdvd,
303 NULL, pd->pkt_dev,
304 NULL, "%s", pd->name);
305 if (IS_ERR(pd->clsdev))
306 pd->clsdev = NULL;
307 }
308 if (pd->clsdev) {
309 pd->kobj_stat = pkt_kobj_create(pd, "stat",
310 &pd->clsdev->kobj,
311 &kobj_pkt_type_stat);
312 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
313 &pd->clsdev->kobj,
314 &kobj_pkt_type_wqueue);
315 }
316 }
317
318 static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
319 {
320 pkt_kobj_remove(pd->kobj_stat);
321 pkt_kobj_remove(pd->kobj_wqueue);
322 if (class_pktcdvd)
323 class_device_destroy(class_pktcdvd, pd->pkt_dev);
324 }
325
326
327 /********************************************************************
328 /sys/class/pktcdvd/
329 add map block device
330 remove unmap packet dev
331 device_map show mappings
332 *******************************************************************/
333
334 static void class_pktcdvd_release(struct class *cls)
335 {
336 kfree(cls);
337 }
338 static ssize_t class_pktcdvd_show_map(struct class *c, char *data)
339 {
340 int n = 0;
341 int idx;
342 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
343 for (idx = 0; idx < MAX_WRITERS; idx++) {
344 struct pktcdvd_device *pd = pkt_devs[idx];
345 if (!pd)
346 continue;
347 n += sprintf(data+n, "%s %u:%u %u:%u\n",
348 pd->name,
349 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
350 MAJOR(pd->bdev->bd_dev),
351 MINOR(pd->bdev->bd_dev));
352 }
353 mutex_unlock(&ctl_mutex);
354 return n;
355 }
356
357 static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf,
358 size_t count)
359 {
360 unsigned int major, minor;
361 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
362 pkt_setup_dev(MKDEV(major, minor), NULL);
363 return count;
364 }
365 return -EINVAL;
366 }
367
368 static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf,
369 size_t count)
370 {
371 unsigned int major, minor;
372 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
373 pkt_remove_dev(MKDEV(major, minor));
374 return count;
375 }
376 return -EINVAL;
377 }
378
379 static struct class_attribute class_pktcdvd_attrs[] = {
380 __ATTR(add, 0200, NULL, class_pktcdvd_store_add),
381 __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove),
382 __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL),
383 __ATTR_NULL
384 };
385
386
387 static int pkt_sysfs_init(void)
388 {
389 int ret = 0;
390
391 /*
392 * create control files in sysfs
393 * /sys/class/pktcdvd/...
394 */
395 class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
396 if (!class_pktcdvd)
397 return -ENOMEM;
398 class_pktcdvd->name = DRIVER_NAME;
399 class_pktcdvd->owner = THIS_MODULE;
400 class_pktcdvd->class_release = class_pktcdvd_release;
401 class_pktcdvd->class_attrs = class_pktcdvd_attrs;
402 ret = class_register(class_pktcdvd);
403 if (ret) {
404 kfree(class_pktcdvd);
405 class_pktcdvd = NULL;
406 printk(DRIVER_NAME": failed to create class pktcdvd\n");
407 return ret;
408 }
409 return 0;
410 }
411
412 static void pkt_sysfs_cleanup(void)
413 {
414 if (class_pktcdvd)
415 class_destroy(class_pktcdvd);
416 class_pktcdvd = NULL;
417 }
418
419 /********************************************************************
420 entries in debugfs
421
422 /debugfs/pktcdvd[0-7]/
423 info
424
425 *******************************************************************/
426
427 static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
428 {
429 return pkt_seq_show(m, p);
430 }
431
432 static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
433 {
434 return single_open(file, pkt_debugfs_seq_show, inode->i_private);
435 }
436
437 static const struct file_operations debug_fops = {
438 .open = pkt_debugfs_fops_open,
439 .read = seq_read,
440 .llseek = seq_lseek,
441 .release = single_release,
442 .owner = THIS_MODULE,
443 };
444
445 static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
446 {
447 if (!pkt_debugfs_root)
448 return;
449 pd->dfs_f_info = NULL;
450 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
451 if (IS_ERR(pd->dfs_d_root)) {
452 pd->dfs_d_root = NULL;
453 return;
454 }
455 pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
456 pd->dfs_d_root, pd, &debug_fops);
457 if (IS_ERR(pd->dfs_f_info)) {
458 pd->dfs_f_info = NULL;
459 return;
460 }
461 }
462
463 static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
464 {
465 if (!pkt_debugfs_root)
466 return;
467 if (pd->dfs_f_info)
468 debugfs_remove(pd->dfs_f_info);
469 pd->dfs_f_info = NULL;
470 if (pd->dfs_d_root)
471 debugfs_remove(pd->dfs_d_root);
472 pd->dfs_d_root = NULL;
473 }
474
475 static void pkt_debugfs_init(void)
476 {
477 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
478 if (IS_ERR(pkt_debugfs_root)) {
479 pkt_debugfs_root = NULL;
480 return;
481 }
482 }
483
484 static void pkt_debugfs_cleanup(void)
485 {
486 if (!pkt_debugfs_root)
487 return;
488 debugfs_remove(pkt_debugfs_root);
489 pkt_debugfs_root = NULL;
490 }
491
492 /* ----------------------------------------------------------*/
493
494
495 static void pkt_bio_finished(struct pktcdvd_device *pd)
496 {
497 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
498 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
499 VPRINTK(DRIVER_NAME": queue empty\n");
500 atomic_set(&pd->iosched.attention, 1);
501 wake_up(&pd->wqueue);
502 }
503 }
504
505 static void pkt_bio_destructor(struct bio *bio)
506 {
507 kfree(bio->bi_io_vec);
508 kfree(bio);
509 }
510
511 static struct bio *pkt_bio_alloc(int nr_iovecs)
512 {
513 struct bio_vec *bvl = NULL;
514 struct bio *bio;
515
516 bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
517 if (!bio)
518 goto no_bio;
519 bio_init(bio);
520
521 bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
522 if (!bvl)
523 goto no_bvl;
524
525 bio->bi_max_vecs = nr_iovecs;
526 bio->bi_io_vec = bvl;
527 bio->bi_destructor = pkt_bio_destructor;
528
529 return bio;
530
531 no_bvl:
532 kfree(bio);
533 no_bio:
534 return NULL;
535 }
536
537 /*
538 * Allocate a packet_data struct
539 */
540 static struct packet_data *pkt_alloc_packet_data(int frames)
541 {
542 int i;
543 struct packet_data *pkt;
544
545 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
546 if (!pkt)
547 goto no_pkt;
548
549 pkt->frames = frames;
550 pkt->w_bio = pkt_bio_alloc(frames);
551 if (!pkt->w_bio)
552 goto no_bio;
553
554 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
555 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
556 if (!pkt->pages[i])
557 goto no_page;
558 }
559
560 spin_lock_init(&pkt->lock);
561
562 for (i = 0; i < frames; i++) {
563 struct bio *bio = pkt_bio_alloc(1);
564 if (!bio)
565 goto no_rd_bio;
566 pkt->r_bios[i] = bio;
567 }
568
569 return pkt;
570
571 no_rd_bio:
572 for (i = 0; i < frames; i++) {
573 struct bio *bio = pkt->r_bios[i];
574 if (bio)
575 bio_put(bio);
576 }
577
578 no_page:
579 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
580 if (pkt->pages[i])
581 __free_page(pkt->pages[i]);
582 bio_put(pkt->w_bio);
583 no_bio:
584 kfree(pkt);
585 no_pkt:
586 return NULL;
587 }
588
589 /*
590 * Free a packet_data struct
591 */
592 static void pkt_free_packet_data(struct packet_data *pkt)
593 {
594 int i;
595
596 for (i = 0; i < pkt->frames; i++) {
597 struct bio *bio = pkt->r_bios[i];
598 if (bio)
599 bio_put(bio);
600 }
601 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
602 __free_page(pkt->pages[i]);
603 bio_put(pkt->w_bio);
604 kfree(pkt);
605 }
606
607 static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
608 {
609 struct packet_data *pkt, *next;
610
611 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
612
613 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
614 pkt_free_packet_data(pkt);
615 }
616 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
617 }
618
619 static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
620 {
621 struct packet_data *pkt;
622
623 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
624
625 while (nr_packets > 0) {
626 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
627 if (!pkt) {
628 pkt_shrink_pktlist(pd);
629 return 0;
630 }
631 pkt->id = nr_packets;
632 pkt->pd = pd;
633 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
634 nr_packets--;
635 }
636 return 1;
637 }
638
639 static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
640 {
641 struct rb_node *n = rb_next(&node->rb_node);
642 if (!n)
643 return NULL;
644 return rb_entry(n, struct pkt_rb_node, rb_node);
645 }
646
647 static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
648 {
649 rb_erase(&node->rb_node, &pd->bio_queue);
650 mempool_free(node, pd->rb_pool);
651 pd->bio_queue_size--;
652 BUG_ON(pd->bio_queue_size < 0);
653 }
654
655 /*
656 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
657 */
658 static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
659 {
660 struct rb_node *n = pd->bio_queue.rb_node;
661 struct rb_node *next;
662 struct pkt_rb_node *tmp;
663
664 if (!n) {
665 BUG_ON(pd->bio_queue_size > 0);
666 return NULL;
667 }
668
669 for (;;) {
670 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
671 if (s <= tmp->bio->bi_sector)
672 next = n->rb_left;
673 else
674 next = n->rb_right;
675 if (!next)
676 break;
677 n = next;
678 }
679
680 if (s > tmp->bio->bi_sector) {
681 tmp = pkt_rbtree_next(tmp);
682 if (!tmp)
683 return NULL;
684 }
685 BUG_ON(s > tmp->bio->bi_sector);
686 return tmp;
687 }
688
689 /*
690 * Insert a node into the pd->bio_queue rb tree.
691 */
692 static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
693 {
694 struct rb_node **p = &pd->bio_queue.rb_node;
695 struct rb_node *parent = NULL;
696 sector_t s = node->bio->bi_sector;
697 struct pkt_rb_node *tmp;
698
699 while (*p) {
700 parent = *p;
701 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
702 if (s < tmp->bio->bi_sector)
703 p = &(*p)->rb_left;
704 else
705 p = &(*p)->rb_right;
706 }
707 rb_link_node(&node->rb_node, parent, p);
708 rb_insert_color(&node->rb_node, &pd->bio_queue);
709 pd->bio_queue_size++;
710 }
711
712 /*
713 * Add a bio to a single linked list defined by its head and tail pointers.
714 */
715 static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
716 {
717 bio->bi_next = NULL;
718 if (*list_tail) {
719 BUG_ON((*list_head) == NULL);
720 (*list_tail)->bi_next = bio;
721 (*list_tail) = bio;
722 } else {
723 BUG_ON((*list_head) != NULL);
724 (*list_head) = bio;
725 (*list_tail) = bio;
726 }
727 }
728
729 /*
730 * Remove and return the first bio from a single linked list defined by its
731 * head and tail pointers.
732 */
733 static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
734 {
735 struct bio *bio;
736
737 if (*list_head == NULL)
738 return NULL;
739
740 bio = *list_head;
741 *list_head = bio->bi_next;
742 if (*list_head == NULL)
743 *list_tail = NULL;
744
745 bio->bi_next = NULL;
746 return bio;
747 }
748
749 /*
750 * Send a packet_command to the underlying block device and
751 * wait for completion.
752 */
753 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
754 {
755 struct request_queue *q = bdev_get_queue(pd->bdev);
756 struct request *rq;
757 int ret = 0;
758
759 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
760 WRITE : READ, __GFP_WAIT);
761
762 if (cgc->buflen) {
763 if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
764 goto out;
765 }
766
767 rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
768 memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
769 if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
770 memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
771
772 rq->timeout = 60*HZ;
773 rq->cmd_type = REQ_TYPE_BLOCK_PC;
774 rq->cmd_flags |= REQ_HARDBARRIER;
775 if (cgc->quiet)
776 rq->cmd_flags |= REQ_QUIET;
777
778 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
779 if (rq->errors)
780 ret = -EIO;
781 out:
782 blk_put_request(rq);
783 return ret;
784 }
785
786 /*
787 * A generic sense dump / resolve mechanism should be implemented across
788 * all ATAPI + SCSI devices.
789 */
790 static void pkt_dump_sense(struct packet_command *cgc)
791 {
792 static char *info[9] = { "No sense", "Recovered error", "Not ready",
793 "Medium error", "Hardware error", "Illegal request",
794 "Unit attention", "Data protect", "Blank check" };
795 int i;
796 struct request_sense *sense = cgc->sense;
797
798 printk(DRIVER_NAME":");
799 for (i = 0; i < CDROM_PACKET_SIZE; i++)
800 printk(" %02x", cgc->cmd[i]);
801 printk(" - ");
802
803 if (sense == NULL) {
804 printk("no sense\n");
805 return;
806 }
807
808 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
809
810 if (sense->sense_key > 8) {
811 printk(" (INVALID)\n");
812 return;
813 }
814
815 printk(" (%s)\n", info[sense->sense_key]);
816 }
817
818 /*
819 * flush the drive cache to media
820 */
821 static int pkt_flush_cache(struct pktcdvd_device *pd)
822 {
823 struct packet_command cgc;
824
825 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
826 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
827 cgc.quiet = 1;
828
829 /*
830 * the IMMED bit -- we default to not setting it, although that
831 * would allow a much faster close, this is safer
832 */
833 #if 0
834 cgc.cmd[1] = 1 << 1;
835 #endif
836 return pkt_generic_packet(pd, &cgc);
837 }
838
839 /*
840 * speed is given as the normal factor, e.g. 4 for 4x
841 */
842 static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed)
843 {
844 struct packet_command cgc;
845 struct request_sense sense;
846 int ret;
847
848 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
849 cgc.sense = &sense;
850 cgc.cmd[0] = GPCMD_SET_SPEED;
851 cgc.cmd[2] = (read_speed >> 8) & 0xff;
852 cgc.cmd[3] = read_speed & 0xff;
853 cgc.cmd[4] = (write_speed >> 8) & 0xff;
854 cgc.cmd[5] = write_speed & 0xff;
855
856 if ((ret = pkt_generic_packet(pd, &cgc)))
857 pkt_dump_sense(&cgc);
858
859 return ret;
860 }
861
862 /*
863 * Queue a bio for processing by the low-level CD device. Must be called
864 * from process context.
865 */
866 static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
867 {
868 spin_lock(&pd->iosched.lock);
869 if (bio_data_dir(bio) == READ) {
870 pkt_add_list_last(bio, &pd->iosched.read_queue,
871 &pd->iosched.read_queue_tail);
872 } else {
873 pkt_add_list_last(bio, &pd->iosched.write_queue,
874 &pd->iosched.write_queue_tail);
875 }
876 spin_unlock(&pd->iosched.lock);
877
878 atomic_set(&pd->iosched.attention, 1);
879 wake_up(&pd->wqueue);
880 }
881
882 /*
883 * Process the queued read/write requests. This function handles special
884 * requirements for CDRW drives:
885 * - A cache flush command must be inserted before a read request if the
886 * previous request was a write.
887 * - Switching between reading and writing is slow, so don't do it more often
888 * than necessary.
889 * - Optimize for throughput at the expense of latency. This means that streaming
890 * writes will never be interrupted by a read, but if the drive has to seek
891 * before the next write, switch to reading instead if there are any pending
892 * read requests.
893 * - Set the read speed according to current usage pattern. When only reading
894 * from the device, it's best to use the highest possible read speed, but
895 * when switching often between reading and writing, it's better to have the
896 * same read and write speeds.
897 */
898 static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
899 {
900
901 if (atomic_read(&pd->iosched.attention) == 0)
902 return;
903 atomic_set(&pd->iosched.attention, 0);
904
905 for (;;) {
906 struct bio *bio;
907 int reads_queued, writes_queued;
908
909 spin_lock(&pd->iosched.lock);
910 reads_queued = (pd->iosched.read_queue != NULL);
911 writes_queued = (pd->iosched.write_queue != NULL);
912 spin_unlock(&pd->iosched.lock);
913
914 if (!reads_queued && !writes_queued)
915 break;
916
917 if (pd->iosched.writing) {
918 int need_write_seek = 1;
919 spin_lock(&pd->iosched.lock);
920 bio = pd->iosched.write_queue;
921 spin_unlock(&pd->iosched.lock);
922 if (bio && (bio->bi_sector == pd->iosched.last_write))
923 need_write_seek = 0;
924 if (need_write_seek && reads_queued) {
925 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
926 VPRINTK(DRIVER_NAME": write, waiting\n");
927 break;
928 }
929 pkt_flush_cache(pd);
930 pd->iosched.writing = 0;
931 }
932 } else {
933 if (!reads_queued && writes_queued) {
934 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
935 VPRINTK(DRIVER_NAME": read, waiting\n");
936 break;
937 }
938 pd->iosched.writing = 1;
939 }
940 }
941
942 spin_lock(&pd->iosched.lock);
943 if (pd->iosched.writing) {
944 bio = pkt_get_list_first(&pd->iosched.write_queue,
945 &pd->iosched.write_queue_tail);
946 } else {
947 bio = pkt_get_list_first(&pd->iosched.read_queue,
948 &pd->iosched.read_queue_tail);
949 }
950 spin_unlock(&pd->iosched.lock);
951
952 if (!bio)
953 continue;
954
955 if (bio_data_dir(bio) == READ)
956 pd->iosched.successive_reads += bio->bi_size >> 10;
957 else {
958 pd->iosched.successive_reads = 0;
959 pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
960 }
961 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
962 if (pd->read_speed == pd->write_speed) {
963 pd->read_speed = MAX_SPEED;
964 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
965 }
966 } else {
967 if (pd->read_speed != pd->write_speed) {
968 pd->read_speed = pd->write_speed;
969 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
970 }
971 }
972
973 atomic_inc(&pd->cdrw.pending_bios);
974 generic_make_request(bio);
975 }
976 }
977
978 /*
979 * Special care is needed if the underlying block device has a small
980 * max_phys_segments value.
981 */
982 static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
983 {
984 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
985 /*
986 * The cdrom device can handle one segment/frame
987 */
988 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
989 return 0;
990 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
991 /*
992 * We can handle this case at the expense of some extra memory
993 * copies during write operations
994 */
995 set_bit(PACKET_MERGE_SEGS, &pd->flags);
996 return 0;
997 } else {
998 printk(DRIVER_NAME": cdrom max_phys_segments too small\n");
999 return -EIO;
1000 }
1001 }
1002
1003 /*
1004 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
1005 */
1006 static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
1007 {
1008 unsigned int copy_size = CD_FRAMESIZE;
1009
1010 while (copy_size > 0) {
1011 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
1012 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
1013 src_bvl->bv_offset + offs;
1014 void *vto = page_address(dst_page) + dst_offs;
1015 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
1016
1017 BUG_ON(len < 0);
1018 memcpy(vto, vfrom, len);
1019 kunmap_atomic(vfrom, KM_USER0);
1020
1021 seg++;
1022 offs = 0;
1023 dst_offs += len;
1024 copy_size -= len;
1025 }
1026 }
1027
1028 /*
1029 * Copy all data for this packet to pkt->pages[], so that
1030 * a) The number of required segments for the write bio is minimized, which
1031 * is necessary for some scsi controllers.
1032 * b) The data can be used as cache to avoid read requests if we receive a
1033 * new write request for the same zone.
1034 */
1035 static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
1036 {
1037 int f, p, offs;
1038
1039 /* Copy all data to pkt->pages[] */
1040 p = 0;
1041 offs = 0;
1042 for (f = 0; f < pkt->frames; f++) {
1043 if (bvec[f].bv_page != pkt->pages[p]) {
1044 void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset;
1045 void *vto = page_address(pkt->pages[p]) + offs;
1046 memcpy(vto, vfrom, CD_FRAMESIZE);
1047 kunmap_atomic(vfrom, KM_USER0);
1048 bvec[f].bv_page = pkt->pages[p];
1049 bvec[f].bv_offset = offs;
1050 } else {
1051 BUG_ON(bvec[f].bv_offset != offs);
1052 }
1053 offs += CD_FRAMESIZE;
1054 if (offs >= PAGE_SIZE) {
1055 offs = 0;
1056 p++;
1057 }
1058 }
1059 }
1060
1061 static void pkt_end_io_read(struct bio *bio, int err)
1062 {
1063 struct packet_data *pkt = bio->bi_private;
1064 struct pktcdvd_device *pd = pkt->pd;
1065 BUG_ON(!pd);
1066
1067 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
1068 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
1069
1070 if (err)
1071 atomic_inc(&pkt->io_errors);
1072 if (atomic_dec_and_test(&pkt->io_wait)) {
1073 atomic_inc(&pkt->run_sm);
1074 wake_up(&pd->wqueue);
1075 }
1076 pkt_bio_finished(pd);
1077 }
1078
1079 static void pkt_end_io_packet_write(struct bio *bio, int err)
1080 {
1081 struct packet_data *pkt = bio->bi_private;
1082 struct pktcdvd_device *pd = pkt->pd;
1083 BUG_ON(!pd);
1084
1085 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
1086
1087 pd->stats.pkt_ended++;
1088
1089 pkt_bio_finished(pd);
1090 atomic_dec(&pkt->io_wait);
1091 atomic_inc(&pkt->run_sm);
1092 wake_up(&pd->wqueue);
1093 }
1094
1095 /*
1096 * Schedule reads for the holes in a packet
1097 */
1098 static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1099 {
1100 int frames_read = 0;
1101 struct bio *bio;
1102 int f;
1103 char written[PACKET_MAX_SIZE];
1104
1105 BUG_ON(!pkt->orig_bios);
1106
1107 atomic_set(&pkt->io_wait, 0);
1108 atomic_set(&pkt->io_errors, 0);
1109
1110 /*
1111 * Figure out which frames we need to read before we can write.
1112 */
1113 memset(written, 0, sizeof(written));
1114 spin_lock(&pkt->lock);
1115 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1116 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1117 int num_frames = bio->bi_size / CD_FRAMESIZE;
1118 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
1119 BUG_ON(first_frame < 0);
1120 BUG_ON(first_frame + num_frames > pkt->frames);
1121 for (f = first_frame; f < first_frame + num_frames; f++)
1122 written[f] = 1;
1123 }
1124 spin_unlock(&pkt->lock);
1125
1126 if (pkt->cache_valid) {
1127 VPRINTK("pkt_gather_data: zone %llx cached\n",
1128 (unsigned long long)pkt->sector);
1129 goto out_account;
1130 }
1131
1132 /*
1133 * Schedule reads for missing parts of the packet.
1134 */
1135 for (f = 0; f < pkt->frames; f++) {
1136 struct bio_vec *vec;
1137
1138 int p, offset;
1139 if (written[f])
1140 continue;
1141 bio = pkt->r_bios[f];
1142 vec = bio->bi_io_vec;
1143 bio_init(bio);
1144 bio->bi_max_vecs = 1;
1145 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1146 bio->bi_bdev = pd->bdev;
1147 bio->bi_end_io = pkt_end_io_read;
1148 bio->bi_private = pkt;
1149 bio->bi_io_vec = vec;
1150 bio->bi_destructor = pkt_bio_destructor;
1151
1152 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1153 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1154 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1155 f, pkt->pages[p], offset);
1156 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1157 BUG();
1158
1159 atomic_inc(&pkt->io_wait);
1160 bio->bi_rw = READ;
1161 pkt_queue_bio(pd, bio);
1162 frames_read++;
1163 }
1164
1165 out_account:
1166 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1167 frames_read, (unsigned long long)pkt->sector);
1168 pd->stats.pkt_started++;
1169 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
1170 }
1171
1172 /*
1173 * Find a packet matching zone, or the least recently used packet if
1174 * there is no match.
1175 */
1176 static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1177 {
1178 struct packet_data *pkt;
1179
1180 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1181 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1182 list_del_init(&pkt->list);
1183 if (pkt->sector != zone)
1184 pkt->cache_valid = 0;
1185 return pkt;
1186 }
1187 }
1188 BUG();
1189 return NULL;
1190 }
1191
1192 static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1193 {
1194 if (pkt->cache_valid) {
1195 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1196 } else {
1197 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1198 }
1199 }
1200
1201 /*
1202 * recover a failed write, query for relocation if possible
1203 *
1204 * returns 1 if recovery is possible, or 0 if not
1205 *
1206 */
1207 static int pkt_start_recovery(struct packet_data *pkt)
1208 {
1209 /*
1210 * FIXME. We need help from the file system to implement
1211 * recovery handling.
1212 */
1213 return 0;
1214 #if 0
1215 struct request *rq = pkt->rq;
1216 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1217 struct block_device *pkt_bdev;
1218 struct super_block *sb = NULL;
1219 unsigned long old_block, new_block;
1220 sector_t new_sector;
1221
1222 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1223 if (pkt_bdev) {
1224 sb = get_super(pkt_bdev);
1225 bdput(pkt_bdev);
1226 }
1227
1228 if (!sb)
1229 return 0;
1230
1231 if (!sb->s_op || !sb->s_op->relocate_blocks)
1232 goto out;
1233
1234 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1235 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1236 goto out;
1237
1238 new_sector = new_block * (CD_FRAMESIZE >> 9);
1239 pkt->sector = new_sector;
1240
1241 pkt->bio->bi_sector = new_sector;
1242 pkt->bio->bi_next = NULL;
1243 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
1244 pkt->bio->bi_idx = 0;
1245
1246 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
1247 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
1248 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
1249 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
1250 BUG_ON(pkt->bio->bi_private != pkt);
1251
1252 drop_super(sb);
1253 return 1;
1254
1255 out:
1256 drop_super(sb);
1257 return 0;
1258 #endif
1259 }
1260
1261 static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1262 {
1263 #if PACKET_DEBUG > 1
1264 static const char *state_name[] = {
1265 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1266 };
1267 enum packet_data_state old_state = pkt->state;
1268 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
1269 state_name[old_state], state_name[state]);
1270 #endif
1271 pkt->state = state;
1272 }
1273
1274 /*
1275 * Scan the work queue to see if we can start a new packet.
1276 * returns non-zero if any work was done.
1277 */
1278 static int pkt_handle_queue(struct pktcdvd_device *pd)
1279 {
1280 struct packet_data *pkt, *p;
1281 struct bio *bio = NULL;
1282 sector_t zone = 0; /* Suppress gcc warning */
1283 struct pkt_rb_node *node, *first_node;
1284 struct rb_node *n;
1285 int wakeup;
1286
1287 VPRINTK("handle_queue\n");
1288
1289 atomic_set(&pd->scan_queue, 0);
1290
1291 if (list_empty(&pd->cdrw.pkt_free_list)) {
1292 VPRINTK("handle_queue: no pkt\n");
1293 return 0;
1294 }
1295
1296 /*
1297 * Try to find a zone we are not already working on.
1298 */
1299 spin_lock(&pd->lock);
1300 first_node = pkt_rbtree_find(pd, pd->current_sector);
1301 if (!first_node) {
1302 n = rb_first(&pd->bio_queue);
1303 if (n)
1304 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1305 }
1306 node = first_node;
1307 while (node) {
1308 bio = node->bio;
1309 zone = ZONE(bio->bi_sector, pd);
1310 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
1311 if (p->sector == zone) {
1312 bio = NULL;
1313 goto try_next_bio;
1314 }
1315 }
1316 break;
1317 try_next_bio:
1318 node = pkt_rbtree_next(node);
1319 if (!node) {
1320 n = rb_first(&pd->bio_queue);
1321 if (n)
1322 node = rb_entry(n, struct pkt_rb_node, rb_node);
1323 }
1324 if (node == first_node)
1325 node = NULL;
1326 }
1327 spin_unlock(&pd->lock);
1328 if (!bio) {
1329 VPRINTK("handle_queue: no bio\n");
1330 return 0;
1331 }
1332
1333 pkt = pkt_get_packet_data(pd, zone);
1334
1335 pd->current_sector = zone + pd->settings.size;
1336 pkt->sector = zone;
1337 BUG_ON(pkt->frames != pd->settings.size >> 2);
1338 pkt->write_size = 0;
1339
1340 /*
1341 * Scan work queue for bios in the same zone and link them
1342 * to this packet.
1343 */
1344 spin_lock(&pd->lock);
1345 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
1346 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1347 bio = node->bio;
1348 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1349 (unsigned long long)ZONE(bio->bi_sector, pd));
1350 if (ZONE(bio->bi_sector, pd) != zone)
1351 break;
1352 pkt_rbtree_erase(pd, node);
1353 spin_lock(&pkt->lock);
1354 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
1355 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
1356 spin_unlock(&pkt->lock);
1357 }
1358 /* check write congestion marks, and if bio_queue_size is
1359 below, wake up any waiters */
1360 wakeup = (pd->write_congestion_on > 0
1361 && pd->bio_queue_size <= pd->write_congestion_off);
1362 spin_unlock(&pd->lock);
1363 if (wakeup)
1364 clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE);
1365
1366 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1367 pkt_set_state(pkt, PACKET_WAITING_STATE);
1368 atomic_set(&pkt->run_sm, 1);
1369
1370 spin_lock(&pd->cdrw.active_list_lock);
1371 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1372 spin_unlock(&pd->cdrw.active_list_lock);
1373
1374 return 1;
1375 }
1376
1377 /*
1378 * Assemble a bio to write one packet and queue the bio for processing
1379 * by the underlying block device.
1380 */
1381 static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1382 {
1383 struct bio *bio;
1384 int f;
1385 int frames_write;
1386 struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
1387
1388 for (f = 0; f < pkt->frames; f++) {
1389 bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1390 bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1391 }
1392
1393 /*
1394 * Fill-in bvec with data from orig_bios.
1395 */
1396 frames_write = 0;
1397 spin_lock(&pkt->lock);
1398 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1399 int segment = bio->bi_idx;
1400 int src_offs = 0;
1401 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1402 int num_frames = bio->bi_size / CD_FRAMESIZE;
1403 BUG_ON(first_frame < 0);
1404 BUG_ON(first_frame + num_frames > pkt->frames);
1405 for (f = first_frame; f < first_frame + num_frames; f++) {
1406 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1407
1408 while (src_offs >= src_bvl->bv_len) {
1409 src_offs -= src_bvl->bv_len;
1410 segment++;
1411 BUG_ON(segment >= bio->bi_vcnt);
1412 src_bvl = bio_iovec_idx(bio, segment);
1413 }
1414
1415 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
1416 bvec[f].bv_page = src_bvl->bv_page;
1417 bvec[f].bv_offset = src_bvl->bv_offset + src_offs;
1418 } else {
1419 pkt_copy_bio_data(bio, segment, src_offs,
1420 bvec[f].bv_page, bvec[f].bv_offset);
1421 }
1422 src_offs += CD_FRAMESIZE;
1423 frames_write++;
1424 }
1425 }
1426 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1427 spin_unlock(&pkt->lock);
1428
1429 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1430 frames_write, (unsigned long long)pkt->sector);
1431 BUG_ON(frames_write != pkt->write_size);
1432
1433 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
1434 pkt_make_local_copy(pkt, bvec);
1435 pkt->cache_valid = 1;
1436 } else {
1437 pkt->cache_valid = 0;
1438 }
1439
1440 /* Start the write request */
1441 bio_init(pkt->w_bio);
1442 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1443 pkt->w_bio->bi_sector = pkt->sector;
1444 pkt->w_bio->bi_bdev = pd->bdev;
1445 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1446 pkt->w_bio->bi_private = pkt;
1447 pkt->w_bio->bi_io_vec = bvec;
1448 pkt->w_bio->bi_destructor = pkt_bio_destructor;
1449 for (f = 0; f < pkt->frames; f++)
1450 if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
1451 BUG();
1452 VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt);
1453
1454 atomic_set(&pkt->io_wait, 1);
1455 pkt->w_bio->bi_rw = WRITE;
1456 pkt_queue_bio(pd, pkt->w_bio);
1457 }
1458
1459 static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1460 {
1461 struct bio *bio, *next;
1462
1463 if (!uptodate)
1464 pkt->cache_valid = 0;
1465
1466 /* Finish all bios corresponding to this packet */
1467 bio = pkt->orig_bios;
1468 while (bio) {
1469 next = bio->bi_next;
1470 bio->bi_next = NULL;
1471 bio_endio(bio, uptodate ? 0 : -EIO);
1472 bio = next;
1473 }
1474 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1475 }
1476
1477 static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1478 {
1479 int uptodate;
1480
1481 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1482
1483 for (;;) {
1484 switch (pkt->state) {
1485 case PACKET_WAITING_STATE:
1486 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1487 return;
1488
1489 pkt->sleep_time = 0;
1490 pkt_gather_data(pd, pkt);
1491 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1492 break;
1493
1494 case PACKET_READ_WAIT_STATE:
1495 if (atomic_read(&pkt->io_wait) > 0)
1496 return;
1497
1498 if (atomic_read(&pkt->io_errors) > 0) {
1499 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1500 } else {
1501 pkt_start_write(pd, pkt);
1502 }
1503 break;
1504
1505 case PACKET_WRITE_WAIT_STATE:
1506 if (atomic_read(&pkt->io_wait) > 0)
1507 return;
1508
1509 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1510 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1511 } else {
1512 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1513 }
1514 break;
1515
1516 case PACKET_RECOVERY_STATE:
1517 if (pkt_start_recovery(pkt)) {
1518 pkt_start_write(pd, pkt);
1519 } else {
1520 VPRINTK("No recovery possible\n");
1521 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1522 }
1523 break;
1524
1525 case PACKET_FINISHED_STATE:
1526 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1527 pkt_finish_packet(pkt, uptodate);
1528 return;
1529
1530 default:
1531 BUG();
1532 break;
1533 }
1534 }
1535 }
1536
1537 static void pkt_handle_packets(struct pktcdvd_device *pd)
1538 {
1539 struct packet_data *pkt, *next;
1540
1541 VPRINTK("pkt_handle_packets\n");
1542
1543 /*
1544 * Run state machine for active packets
1545 */
1546 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1547 if (atomic_read(&pkt->run_sm) > 0) {
1548 atomic_set(&pkt->run_sm, 0);
1549 pkt_run_state_machine(pd, pkt);
1550 }
1551 }
1552
1553 /*
1554 * Move no longer active packets to the free list
1555 */
1556 spin_lock(&pd->cdrw.active_list_lock);
1557 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1558 if (pkt->state == PACKET_FINISHED_STATE) {
1559 list_del(&pkt->list);
1560 pkt_put_packet_data(pd, pkt);
1561 pkt_set_state(pkt, PACKET_IDLE_STATE);
1562 atomic_set(&pd->scan_queue, 1);
1563 }
1564 }
1565 spin_unlock(&pd->cdrw.active_list_lock);
1566 }
1567
1568 static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1569 {
1570 struct packet_data *pkt;
1571 int i;
1572
1573 for (i = 0; i < PACKET_NUM_STATES; i++)
1574 states[i] = 0;
1575
1576 spin_lock(&pd->cdrw.active_list_lock);
1577 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1578 states[pkt->state]++;
1579 }
1580 spin_unlock(&pd->cdrw.active_list_lock);
1581 }
1582
1583 /*
1584 * kcdrwd is woken up when writes have been queued for one of our
1585 * registered devices
1586 */
1587 static int kcdrwd(void *foobar)
1588 {
1589 struct pktcdvd_device *pd = foobar;
1590 struct packet_data *pkt;
1591 long min_sleep_time, residue;
1592
1593 set_user_nice(current, -20);
1594 set_freezable();
1595
1596 for (;;) {
1597 DECLARE_WAITQUEUE(wait, current);
1598
1599 /*
1600 * Wait until there is something to do
1601 */
1602 add_wait_queue(&pd->wqueue, &wait);
1603 for (;;) {
1604 set_current_state(TASK_INTERRUPTIBLE);
1605
1606 /* Check if we need to run pkt_handle_queue */
1607 if (atomic_read(&pd->scan_queue) > 0)
1608 goto work_to_do;
1609
1610 /* Check if we need to run the state machine for some packet */
1611 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1612 if (atomic_read(&pkt->run_sm) > 0)
1613 goto work_to_do;
1614 }
1615
1616 /* Check if we need to process the iosched queues */
1617 if (atomic_read(&pd->iosched.attention) != 0)
1618 goto work_to_do;
1619
1620 /* Otherwise, go to sleep */
1621 if (PACKET_DEBUG > 1) {
1622 int states[PACKET_NUM_STATES];
1623 pkt_count_states(pd, states);
1624 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1625 states[0], states[1], states[2], states[3],
1626 states[4], states[5]);
1627 }
1628
1629 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1630 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1631 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1632 min_sleep_time = pkt->sleep_time;
1633 }
1634
1635 generic_unplug_device(bdev_get_queue(pd->bdev));
1636
1637 VPRINTK("kcdrwd: sleeping\n");
1638 residue = schedule_timeout(min_sleep_time);
1639 VPRINTK("kcdrwd: wake up\n");
1640
1641 /* make swsusp happy with our thread */
1642 try_to_freeze();
1643
1644 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1645 if (!pkt->sleep_time)
1646 continue;
1647 pkt->sleep_time -= min_sleep_time - residue;
1648 if (pkt->sleep_time <= 0) {
1649 pkt->sleep_time = 0;
1650 atomic_inc(&pkt->run_sm);
1651 }
1652 }
1653
1654 if (kthread_should_stop())
1655 break;
1656 }
1657 work_to_do:
1658 set_current_state(TASK_RUNNING);
1659 remove_wait_queue(&pd->wqueue, &wait);
1660
1661 if (kthread_should_stop())
1662 break;
1663
1664 /*
1665 * if pkt_handle_queue returns true, we can queue
1666 * another request.
1667 */
1668 while (pkt_handle_queue(pd))
1669 ;
1670
1671 /*
1672 * Handle packet state machine
1673 */
1674 pkt_handle_packets(pd);
1675
1676 /*
1677 * Handle iosched queues
1678 */
1679 pkt_iosched_process_queue(pd);
1680 }
1681
1682 return 0;
1683 }
1684
1685 static void pkt_print_settings(struct pktcdvd_device *pd)
1686 {
1687 printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
1688 printk("%u blocks, ", pd->settings.size >> 2);
1689 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1690 }
1691
1692 static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1693 {
1694 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1695
1696 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1697 cgc->cmd[2] = page_code | (page_control << 6);
1698 cgc->cmd[7] = cgc->buflen >> 8;
1699 cgc->cmd[8] = cgc->buflen & 0xff;
1700 cgc->data_direction = CGC_DATA_READ;
1701 return pkt_generic_packet(pd, cgc);
1702 }
1703
1704 static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1705 {
1706 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1707 memset(cgc->buffer, 0, 2);
1708 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1709 cgc->cmd[1] = 0x10; /* PF */
1710 cgc->cmd[7] = cgc->buflen >> 8;
1711 cgc->cmd[8] = cgc->buflen & 0xff;
1712 cgc->data_direction = CGC_DATA_WRITE;
1713 return pkt_generic_packet(pd, cgc);
1714 }
1715
1716 static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1717 {
1718 struct packet_command cgc;
1719 int ret;
1720
1721 /* set up command and get the disc info */
1722 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1723 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1724 cgc.cmd[8] = cgc.buflen = 2;
1725 cgc.quiet = 1;
1726
1727 if ((ret = pkt_generic_packet(pd, &cgc)))
1728 return ret;
1729
1730 /* not all drives have the same disc_info length, so requeue
1731 * packet with the length the drive tells us it can supply
1732 */
1733 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1734 sizeof(di->disc_information_length);
1735
1736 if (cgc.buflen > sizeof(disc_information))
1737 cgc.buflen = sizeof(disc_information);
1738
1739 cgc.cmd[8] = cgc.buflen;
1740 return pkt_generic_packet(pd, &cgc);
1741 }
1742
1743 static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1744 {
1745 struct packet_command cgc;
1746 int ret;
1747
1748 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1749 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1750 cgc.cmd[1] = type & 3;
1751 cgc.cmd[4] = (track & 0xff00) >> 8;
1752 cgc.cmd[5] = track & 0xff;
1753 cgc.cmd[8] = 8;
1754 cgc.quiet = 1;
1755
1756 if ((ret = pkt_generic_packet(pd, &cgc)))
1757 return ret;
1758
1759 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1760 sizeof(ti->track_information_length);
1761
1762 if (cgc.buflen > sizeof(track_information))
1763 cgc.buflen = sizeof(track_information);
1764
1765 cgc.cmd[8] = cgc.buflen;
1766 return pkt_generic_packet(pd, &cgc);
1767 }
1768
1769 static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written)
1770 {
1771 disc_information di;
1772 track_information ti;
1773 __u32 last_track;
1774 int ret = -1;
1775
1776 if ((ret = pkt_get_disc_info(pd, &di)))
1777 return ret;
1778
1779 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1780 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1781 return ret;
1782
1783 /* if this track is blank, try the previous. */
1784 if (ti.blank) {
1785 last_track--;
1786 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1787 return ret;
1788 }
1789
1790 /* if last recorded field is valid, return it. */
1791 if (ti.lra_v) {
1792 *last_written = be32_to_cpu(ti.last_rec_address);
1793 } else {
1794 /* make it up instead */
1795 *last_written = be32_to_cpu(ti.track_start) +
1796 be32_to_cpu(ti.track_size);
1797 if (ti.free_blocks)
1798 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1799 }
1800 return 0;
1801 }
1802
1803 /*
1804 * write mode select package based on pd->settings
1805 */
1806 static int pkt_set_write_settings(struct pktcdvd_device *pd)
1807 {
1808 struct packet_command cgc;
1809 struct request_sense sense;
1810 write_param_page *wp;
1811 char buffer[128];
1812 int ret, size;
1813
1814 /* doesn't apply to DVD+RW or DVD-RAM */
1815 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1816 return 0;
1817
1818 memset(buffer, 0, sizeof(buffer));
1819 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1820 cgc.sense = &sense;
1821 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1822 pkt_dump_sense(&cgc);
1823 return ret;
1824 }
1825
1826 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1827 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1828 if (size > sizeof(buffer))
1829 size = sizeof(buffer);
1830
1831 /*
1832 * now get it all
1833 */
1834 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1835 cgc.sense = &sense;
1836 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1837 pkt_dump_sense(&cgc);
1838 return ret;
1839 }
1840
1841 /*
1842 * write page is offset header + block descriptor length
1843 */
1844 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1845
1846 wp->fp = pd->settings.fp;
1847 wp->track_mode = pd->settings.track_mode;
1848 wp->write_type = pd->settings.write_type;
1849 wp->data_block_type = pd->settings.block_mode;
1850
1851 wp->multi_session = 0;
1852
1853 #ifdef PACKET_USE_LS
1854 wp->link_size = 7;
1855 wp->ls_v = 1;
1856 #endif
1857
1858 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1859 wp->session_format = 0;
1860 wp->subhdr2 = 0x20;
1861 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1862 wp->session_format = 0x20;
1863 wp->subhdr2 = 8;
1864 #if 0
1865 wp->mcn[0] = 0x80;
1866 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1867 #endif
1868 } else {
1869 /*
1870 * paranoia
1871 */
1872 printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type);
1873 return 1;
1874 }
1875 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1876
1877 cgc.buflen = cgc.cmd[8] = size;
1878 if ((ret = pkt_mode_select(pd, &cgc))) {
1879 pkt_dump_sense(&cgc);
1880 return ret;
1881 }
1882
1883 pkt_print_settings(pd);
1884 return 0;
1885 }
1886
1887 /*
1888 * 1 -- we can write to this track, 0 -- we can't
1889 */
1890 static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
1891 {
1892 switch (pd->mmc3_profile) {
1893 case 0x1a: /* DVD+RW */
1894 case 0x12: /* DVD-RAM */
1895 /* The track is always writable on DVD+RW/DVD-RAM */
1896 return 1;
1897 default:
1898 break;
1899 }
1900
1901 if (!ti->packet || !ti->fp)
1902 return 0;
1903
1904 /*
1905 * "good" settings as per Mt Fuji.
1906 */
1907 if (ti->rt == 0 && ti->blank == 0)
1908 return 1;
1909
1910 if (ti->rt == 0 && ti->blank == 1)
1911 return 1;
1912
1913 if (ti->rt == 1 && ti->blank == 0)
1914 return 1;
1915
1916 printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
1917 return 0;
1918 }
1919
1920 /*
1921 * 1 -- we can write to this disc, 0 -- we can't
1922 */
1923 static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
1924 {
1925 switch (pd->mmc3_profile) {
1926 case 0x0a: /* CD-RW */
1927 case 0xffff: /* MMC3 not supported */
1928 break;
1929 case 0x1a: /* DVD+RW */
1930 case 0x13: /* DVD-RW */
1931 case 0x12: /* DVD-RAM */
1932 return 1;
1933 default:
1934 VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile);
1935 return 0;
1936 }
1937
1938 /*
1939 * for disc type 0xff we should probably reserve a new track.
1940 * but i'm not sure, should we leave this to user apps? probably.
1941 */
1942 if (di->disc_type == 0xff) {
1943 printk(DRIVER_NAME": Unknown disc. No track?\n");
1944 return 0;
1945 }
1946
1947 if (di->disc_type != 0x20 && di->disc_type != 0) {
1948 printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type);
1949 return 0;
1950 }
1951
1952 if (di->erasable == 0) {
1953 printk(DRIVER_NAME": Disc not erasable\n");
1954 return 0;
1955 }
1956
1957 if (di->border_status == PACKET_SESSION_RESERVED) {
1958 printk(DRIVER_NAME": Can't write to last track (reserved)\n");
1959 return 0;
1960 }
1961
1962 return 1;
1963 }
1964
1965 static int pkt_probe_settings(struct pktcdvd_device *pd)
1966 {
1967 struct packet_command cgc;
1968 unsigned char buf[12];
1969 disc_information di;
1970 track_information ti;
1971 int ret, track;
1972
1973 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1974 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1975 cgc.cmd[8] = 8;
1976 ret = pkt_generic_packet(pd, &cgc);
1977 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1978
1979 memset(&di, 0, sizeof(disc_information));
1980 memset(&ti, 0, sizeof(track_information));
1981
1982 if ((ret = pkt_get_disc_info(pd, &di))) {
1983 printk("failed get_disc\n");
1984 return ret;
1985 }
1986
1987 if (!pkt_writable_disc(pd, &di))
1988 return -EROFS;
1989
1990 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
1991
1992 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
1993 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
1994 printk(DRIVER_NAME": failed get_track\n");
1995 return ret;
1996 }
1997
1998 if (!pkt_writable_track(pd, &ti)) {
1999 printk(DRIVER_NAME": can't write to this track\n");
2000 return -EROFS;
2001 }
2002
2003 /*
2004 * we keep packet size in 512 byte units, makes it easier to
2005 * deal with request calculations.
2006 */
2007 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
2008 if (pd->settings.size == 0) {
2009 printk(DRIVER_NAME": detected zero packet size!\n");
2010 return -ENXIO;
2011 }
2012 if (pd->settings.size > PACKET_MAX_SECTORS) {
2013 printk(DRIVER_NAME": packet size is too big\n");
2014 return -EROFS;
2015 }
2016 pd->settings.fp = ti.fp;
2017 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
2018
2019 if (ti.nwa_v) {
2020 pd->nwa = be32_to_cpu(ti.next_writable);
2021 set_bit(PACKET_NWA_VALID, &pd->flags);
2022 }
2023
2024 /*
2025 * in theory we could use lra on -RW media as well and just zero
2026 * blocks that haven't been written yet, but in practice that
2027 * is just a no-go. we'll use that for -R, naturally.
2028 */
2029 if (ti.lra_v) {
2030 pd->lra = be32_to_cpu(ti.last_rec_address);
2031 set_bit(PACKET_LRA_VALID, &pd->flags);
2032 } else {
2033 pd->lra = 0xffffffff;
2034 set_bit(PACKET_LRA_VALID, &pd->flags);
2035 }
2036
2037 /*
2038 * fine for now
2039 */
2040 pd->settings.link_loss = 7;
2041 pd->settings.write_type = 0; /* packet */
2042 pd->settings.track_mode = ti.track_mode;
2043
2044 /*
2045 * mode1 or mode2 disc
2046 */
2047 switch (ti.data_mode) {
2048 case PACKET_MODE1:
2049 pd->settings.block_mode = PACKET_BLOCK_MODE1;
2050 break;
2051 case PACKET_MODE2:
2052 pd->settings.block_mode = PACKET_BLOCK_MODE2;
2053 break;
2054 default:
2055 printk(DRIVER_NAME": unknown data mode\n");
2056 return -EROFS;
2057 }
2058 return 0;
2059 }
2060
2061 /*
2062 * enable/disable write caching on drive
2063 */
2064 static int pkt_write_caching(struct pktcdvd_device *pd, int set)
2065 {
2066 struct packet_command cgc;
2067 struct request_sense sense;
2068 unsigned char buf[64];
2069 int ret;
2070
2071 memset(buf, 0, sizeof(buf));
2072 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
2073 cgc.sense = &sense;
2074 cgc.buflen = pd->mode_offset + 12;
2075
2076 /*
2077 * caching mode page might not be there, so quiet this command
2078 */
2079 cgc.quiet = 1;
2080
2081 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
2082 return ret;
2083
2084 buf[pd->mode_offset + 10] |= (!!set << 2);
2085
2086 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
2087 ret = pkt_mode_select(pd, &cgc);
2088 if (ret) {
2089 printk(DRIVER_NAME": write caching control failed\n");
2090 pkt_dump_sense(&cgc);
2091 } else if (!ret && set)
2092 printk(DRIVER_NAME": enabled write caching on %s\n", pd->name);
2093 return ret;
2094 }
2095
2096 static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
2097 {
2098 struct packet_command cgc;
2099
2100 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2101 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
2102 cgc.cmd[4] = lockflag ? 1 : 0;
2103 return pkt_generic_packet(pd, &cgc);
2104 }
2105
2106 /*
2107 * Returns drive maximum write speed
2108 */
2109 static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed)
2110 {
2111 struct packet_command cgc;
2112 struct request_sense sense;
2113 unsigned char buf[256+18];
2114 unsigned char *cap_buf;
2115 int ret, offset;
2116
2117 memset(buf, 0, sizeof(buf));
2118 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
2119 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
2120 cgc.sense = &sense;
2121
2122 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2123 if (ret) {
2124 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
2125 sizeof(struct mode_page_header);
2126 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2127 if (ret) {
2128 pkt_dump_sense(&cgc);
2129 return ret;
2130 }
2131 }
2132
2133 offset = 20; /* Obsoleted field, used by older drives */
2134 if (cap_buf[1] >= 28)
2135 offset = 28; /* Current write speed selected */
2136 if (cap_buf[1] >= 30) {
2137 /* If the drive reports at least one "Logical Unit Write
2138 * Speed Performance Descriptor Block", use the information
2139 * in the first block. (contains the highest speed)
2140 */
2141 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
2142 if (num_spdb > 0)
2143 offset = 34;
2144 }
2145
2146 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
2147 return 0;
2148 }
2149
2150 /* These tables from cdrecord - I don't have orange book */
2151 /* standard speed CD-RW (1-4x) */
2152 static char clv_to_speed[16] = {
2153 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2154 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2155 };
2156 /* high speed CD-RW (-10x) */
2157 static char hs_clv_to_speed[16] = {
2158 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2159 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2160 };
2161 /* ultra high speed CD-RW */
2162 static char us_clv_to_speed[16] = {
2163 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2164 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2165 };
2166
2167 /*
2168 * reads the maximum media speed from ATIP
2169 */
2170 static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed)
2171 {
2172 struct packet_command cgc;
2173 struct request_sense sense;
2174 unsigned char buf[64];
2175 unsigned int size, st, sp;
2176 int ret;
2177
2178 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2179 cgc.sense = &sense;
2180 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2181 cgc.cmd[1] = 2;
2182 cgc.cmd[2] = 4; /* READ ATIP */
2183 cgc.cmd[8] = 2;
2184 ret = pkt_generic_packet(pd, &cgc);
2185 if (ret) {
2186 pkt_dump_sense(&cgc);
2187 return ret;
2188 }
2189 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2190 if (size > sizeof(buf))
2191 size = sizeof(buf);
2192
2193 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2194 cgc.sense = &sense;
2195 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2196 cgc.cmd[1] = 2;
2197 cgc.cmd[2] = 4;
2198 cgc.cmd[8] = size;
2199 ret = pkt_generic_packet(pd, &cgc);
2200 if (ret) {
2201 pkt_dump_sense(&cgc);
2202 return ret;
2203 }
2204
2205 if (!buf[6] & 0x40) {
2206 printk(DRIVER_NAME": Disc type is not CD-RW\n");
2207 return 1;
2208 }
2209 if (!buf[6] & 0x4) {
2210 printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n");
2211 return 1;
2212 }
2213
2214 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2215
2216 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2217
2218 /* Info from cdrecord */
2219 switch (st) {
2220 case 0: /* standard speed */
2221 *speed = clv_to_speed[sp];
2222 break;
2223 case 1: /* high speed */
2224 *speed = hs_clv_to_speed[sp];
2225 break;
2226 case 2: /* ultra high speed */
2227 *speed = us_clv_to_speed[sp];
2228 break;
2229 default:
2230 printk(DRIVER_NAME": Unknown disc sub-type %d\n",st);
2231 return 1;
2232 }
2233 if (*speed) {
2234 printk(DRIVER_NAME": Max. media speed: %d\n",*speed);
2235 return 0;
2236 } else {
2237 printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st);
2238 return 1;
2239 }
2240 }
2241
2242 static int pkt_perform_opc(struct pktcdvd_device *pd)
2243 {
2244 struct packet_command cgc;
2245 struct request_sense sense;
2246 int ret;
2247
2248 VPRINTK(DRIVER_NAME": Performing OPC\n");
2249
2250 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2251 cgc.sense = &sense;
2252 cgc.timeout = 60*HZ;
2253 cgc.cmd[0] = GPCMD_SEND_OPC;
2254 cgc.cmd[1] = 1;
2255 if ((ret = pkt_generic_packet(pd, &cgc)))
2256 pkt_dump_sense(&cgc);
2257 return ret;
2258 }
2259
2260 static int pkt_open_write(struct pktcdvd_device *pd)
2261 {
2262 int ret;
2263 unsigned int write_speed, media_write_speed, read_speed;
2264
2265 if ((ret = pkt_probe_settings(pd))) {
2266 VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name);
2267 return ret;
2268 }
2269
2270 if ((ret = pkt_set_write_settings(pd))) {
2271 DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name);
2272 return -EIO;
2273 }
2274
2275 pkt_write_caching(pd, USE_WCACHING);
2276
2277 if ((ret = pkt_get_max_speed(pd, &write_speed)))
2278 write_speed = 16 * 177;
2279 switch (pd->mmc3_profile) {
2280 case 0x13: /* DVD-RW */
2281 case 0x1a: /* DVD+RW */
2282 case 0x12: /* DVD-RAM */
2283 DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed);
2284 break;
2285 default:
2286 if ((ret = pkt_media_speed(pd, &media_write_speed)))
2287 media_write_speed = 16;
2288 write_speed = min(write_speed, media_write_speed * 177);
2289 DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176);
2290 break;
2291 }
2292 read_speed = write_speed;
2293
2294 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
2295 DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name);
2296 return -EIO;
2297 }
2298 pd->write_speed = write_speed;
2299 pd->read_speed = read_speed;
2300
2301 if ((ret = pkt_perform_opc(pd))) {
2302 DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name);
2303 }
2304
2305 return 0;
2306 }
2307
2308 /*
2309 * called at open time.
2310 */
2311 static int pkt_open_dev(struct pktcdvd_device *pd, int write)
2312 {
2313 int ret;
2314 long lba;
2315 struct request_queue *q;
2316
2317 /*
2318 * We need to re-open the cdrom device without O_NONBLOCK to be able
2319 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2320 * so bdget() can't fail.
2321 */
2322 bdget(pd->bdev->bd_dev);
2323 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
2324 goto out;
2325
2326 if ((ret = bd_claim(pd->bdev, pd)))
2327 goto out_putdev;
2328
2329 if ((ret = pkt_get_last_written(pd, &lba))) {
2330 printk(DRIVER_NAME": pkt_get_last_written failed\n");
2331 goto out_unclaim;
2332 }
2333
2334 set_capacity(pd->disk, lba << 2);
2335 set_capacity(pd->bdev->bd_disk, lba << 2);
2336 bd_set_size(pd->bdev, (loff_t)lba << 11);
2337
2338 q = bdev_get_queue(pd->bdev);
2339 if (write) {
2340 if ((ret = pkt_open_write(pd)))
2341 goto out_unclaim;
2342 /*
2343 * Some CDRW drives can not handle writes larger than one packet,
2344 * even if the size is a multiple of the packet size.
2345 */
2346 spin_lock_irq(q->queue_lock);
2347 blk_queue_max_sectors(q, pd->settings.size);
2348 spin_unlock_irq(q->queue_lock);
2349 set_bit(PACKET_WRITABLE, &pd->flags);
2350 } else {
2351 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2352 clear_bit(PACKET_WRITABLE, &pd->flags);
2353 }
2354
2355 if ((ret = pkt_set_segment_merging(pd, q)))
2356 goto out_unclaim;
2357
2358 if (write) {
2359 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
2360 printk(DRIVER_NAME": not enough memory for buffers\n");
2361 ret = -ENOMEM;
2362 goto out_unclaim;
2363 }
2364 printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
2365 }
2366
2367 return 0;
2368
2369 out_unclaim:
2370 bd_release(pd->bdev);
2371 out_putdev:
2372 blkdev_put(pd->bdev);
2373 out:
2374 return ret;
2375 }
2376
2377 /*
2378 * called when the device is closed. makes sure that the device flushes
2379 * the internal cache before we close.
2380 */
2381 static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2382 {
2383 if (flush && pkt_flush_cache(pd))
2384 DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name);
2385
2386 pkt_lock_door(pd, 0);
2387
2388 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2389 bd_release(pd->bdev);
2390 blkdev_put(pd->bdev);
2391
2392 pkt_shrink_pktlist(pd);
2393 }
2394
2395 static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2396 {
2397 if (dev_minor >= MAX_WRITERS)
2398 return NULL;
2399 return pkt_devs[dev_minor];
2400 }
2401
2402 static int pkt_open(struct inode *inode, struct file *file)
2403 {
2404 struct pktcdvd_device *pd = NULL;
2405 int ret;
2406
2407 VPRINTK(DRIVER_NAME": entering open\n");
2408
2409 mutex_lock(&ctl_mutex);
2410 pd = pkt_find_dev_from_minor(iminor(inode));
2411 if (!pd) {
2412 ret = -ENODEV;
2413 goto out;
2414 }
2415 BUG_ON(pd->refcnt < 0);
2416
2417 pd->refcnt++;
2418 if (pd->refcnt > 1) {
2419 if ((file->f_mode & FMODE_WRITE) &&
2420 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2421 ret = -EBUSY;
2422 goto out_dec;
2423 }
2424 } else {
2425 ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE);
2426 if (ret)
2427 goto out_dec;
2428 /*
2429 * needed here as well, since ext2 (among others) may change
2430 * the blocksize at mount time
2431 */
2432 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2433 }
2434
2435 mutex_unlock(&ctl_mutex);
2436 return 0;
2437
2438 out_dec:
2439 pd->refcnt--;
2440 out:
2441 VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
2442 mutex_unlock(&ctl_mutex);
2443 return ret;
2444 }
2445
2446 static int pkt_close(struct inode *inode, struct file *file)
2447 {
2448 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2449 int ret = 0;
2450
2451 mutex_lock(&ctl_mutex);
2452 pd->refcnt--;
2453 BUG_ON(pd->refcnt < 0);
2454 if (pd->refcnt == 0) {
2455 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2456 pkt_release_dev(pd, flush);
2457 }
2458 mutex_unlock(&ctl_mutex);
2459 return ret;
2460 }
2461
2462
2463 static void pkt_end_io_read_cloned(struct bio *bio, int err)
2464 {
2465 struct packet_stacked_data *psd = bio->bi_private;
2466 struct pktcdvd_device *pd = psd->pd;
2467
2468 bio_put(bio);
2469 bio_endio(psd->bio, err);
2470 mempool_free(psd, psd_pool);
2471 pkt_bio_finished(pd);
2472 }
2473
2474 static int pkt_make_request(struct request_queue *q, struct bio *bio)
2475 {
2476 struct pktcdvd_device *pd;
2477 char b[BDEVNAME_SIZE];
2478 sector_t zone;
2479 struct packet_data *pkt;
2480 int was_empty, blocked_bio;
2481 struct pkt_rb_node *node;
2482
2483 pd = q->queuedata;
2484 if (!pd) {
2485 printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
2486 goto end_io;
2487 }
2488
2489 /*
2490 * Clone READ bios so we can have our own bi_end_io callback.
2491 */
2492 if (bio_data_dir(bio) == READ) {
2493 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2494 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2495
2496 psd->pd = pd;
2497 psd->bio = bio;
2498 cloned_bio->bi_bdev = pd->bdev;
2499 cloned_bio->bi_private = psd;
2500 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2501 pd->stats.secs_r += bio->bi_size >> 9;
2502 pkt_queue_bio(pd, cloned_bio);
2503 return 0;
2504 }
2505
2506 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
2507 printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n",
2508 pd->name, (unsigned long long)bio->bi_sector);
2509 goto end_io;
2510 }
2511
2512 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
2513 printk(DRIVER_NAME": wrong bio size\n");
2514 goto end_io;
2515 }
2516
2517 blk_queue_bounce(q, &bio);
2518
2519 zone = ZONE(bio->bi_sector, pd);
2520 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2521 (unsigned long long)bio->bi_sector,
2522 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2523
2524 /* Check if we have to split the bio */
2525 {
2526 struct bio_pair *bp;
2527 sector_t last_zone;
2528 int first_sectors;
2529
2530 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2531 if (last_zone != zone) {
2532 BUG_ON(last_zone != zone + pd->settings.size);
2533 first_sectors = last_zone - bio->bi_sector;
2534 bp = bio_split(bio, bio_split_pool, first_sectors);
2535 BUG_ON(!bp);
2536 pkt_make_request(q, &bp->bio1);
2537 pkt_make_request(q, &bp->bio2);
2538 bio_pair_release(bp);
2539 return 0;
2540 }
2541 }
2542
2543 /*
2544 * If we find a matching packet in state WAITING or READ_WAIT, we can
2545 * just append this bio to that packet.
2546 */
2547 spin_lock(&pd->cdrw.active_list_lock);
2548 blocked_bio = 0;
2549 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2550 if (pkt->sector == zone) {
2551 spin_lock(&pkt->lock);
2552 if ((pkt->state == PACKET_WAITING_STATE) ||
2553 (pkt->state == PACKET_READ_WAIT_STATE)) {
2554 pkt_add_list_last(bio, &pkt->orig_bios,
2555 &pkt->orig_bios_tail);
2556 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2557 if ((pkt->write_size >= pkt->frames) &&
2558 (pkt->state == PACKET_WAITING_STATE)) {
2559 atomic_inc(&pkt->run_sm);
2560 wake_up(&pd->wqueue);
2561 }
2562 spin_unlock(&pkt->lock);
2563 spin_unlock(&pd->cdrw.active_list_lock);
2564 return 0;
2565 } else {
2566 blocked_bio = 1;
2567 }
2568 spin_unlock(&pkt->lock);
2569 }
2570 }
2571 spin_unlock(&pd->cdrw.active_list_lock);
2572
2573 /*
2574 * Test if there is enough room left in the bio work queue
2575 * (queue size >= congestion on mark).
2576 * If not, wait till the work queue size is below the congestion off mark.
2577 */
2578 spin_lock(&pd->lock);
2579 if (pd->write_congestion_on > 0
2580 && pd->bio_queue_size >= pd->write_congestion_on) {
2581 set_bdi_congested(&q->backing_dev_info, WRITE);
2582 do {
2583 spin_unlock(&pd->lock);
2584 congestion_wait(WRITE, HZ);
2585 spin_lock(&pd->lock);
2586 } while(pd->bio_queue_size > pd->write_congestion_off);
2587 }
2588 spin_unlock(&pd->lock);
2589
2590 /*
2591 * No matching packet found. Store the bio in the work queue.
2592 */
2593 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
2594 node->bio = bio;
2595 spin_lock(&pd->lock);
2596 BUG_ON(pd->bio_queue_size < 0);
2597 was_empty = (pd->bio_queue_size == 0);
2598 pkt_rbtree_insert(pd, node);
2599 spin_unlock(&pd->lock);
2600
2601 /*
2602 * Wake up the worker thread.
2603 */
2604 atomic_set(&pd->scan_queue, 1);
2605 if (was_empty) {
2606 /* This wake_up is required for correct operation */
2607 wake_up(&pd->wqueue);
2608 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2609 /*
2610 * This wake up is not required for correct operation,
2611 * but improves performance in some cases.
2612 */
2613 wake_up(&pd->wqueue);
2614 }
2615 return 0;
2616 end_io:
2617 bio_io_error(bio);
2618 return 0;
2619 }
2620
2621
2622
2623 static int pkt_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec)
2624 {
2625 struct pktcdvd_device *pd = q->queuedata;
2626 sector_t zone = ZONE(bio->bi_sector, pd);
2627 int used = ((bio->bi_sector - zone) << 9) + bio->bi_size;
2628 int remaining = (pd->settings.size << 9) - used;
2629 int remaining2;
2630
2631 /*
2632 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2633 * boundary, pkt_make_request() will split the bio.
2634 */
2635 remaining2 = PAGE_SIZE - bio->bi_size;
2636 remaining = max(remaining, remaining2);
2637
2638 BUG_ON(remaining < 0);
2639 return remaining;
2640 }
2641
2642 static void pkt_init_queue(struct pktcdvd_device *pd)
2643 {
2644 struct request_queue *q = pd->disk->queue;
2645
2646 blk_queue_make_request(q, pkt_make_request);
2647 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2648 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2649 blk_queue_merge_bvec(q, pkt_merge_bvec);
2650 q->queuedata = pd;
2651 }
2652
2653 static int pkt_seq_show(struct seq_file *m, void *p)
2654 {
2655 struct pktcdvd_device *pd = m->private;
2656 char *msg;
2657 char bdev_buf[BDEVNAME_SIZE];
2658 int states[PACKET_NUM_STATES];
2659
2660 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2661 bdevname(pd->bdev, bdev_buf));
2662
2663 seq_printf(m, "\nSettings:\n");
2664 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2665
2666 if (pd->settings.write_type == 0)
2667 msg = "Packet";
2668 else
2669 msg = "Unknown";
2670 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2671
2672 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2673 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2674
2675 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2676
2677 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2678 msg = "Mode 1";
2679 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2680 msg = "Mode 2";
2681 else
2682 msg = "Unknown";
2683 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2684
2685 seq_printf(m, "\nStatistics:\n");
2686 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2687 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2688 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2689 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2690 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2691
2692 seq_printf(m, "\nMisc:\n");
2693 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2694 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2695 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2696 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2697 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2698 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2699
2700 seq_printf(m, "\nQueue state:\n");
2701 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2702 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2703 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2704
2705 pkt_count_states(pd, states);
2706 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2707 states[0], states[1], states[2], states[3], states[4], states[5]);
2708
2709 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2710 pd->write_congestion_off,
2711 pd->write_congestion_on);
2712 return 0;
2713 }
2714
2715 static int pkt_seq_open(struct inode *inode, struct file *file)
2716 {
2717 return single_open(file, pkt_seq_show, PDE(inode)->data);
2718 }
2719
2720 static const struct file_operations pkt_proc_fops = {
2721 .open = pkt_seq_open,
2722 .read = seq_read,
2723 .llseek = seq_lseek,
2724 .release = single_release
2725 };
2726
2727 static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2728 {
2729 int i;
2730 int ret = 0;
2731 char b[BDEVNAME_SIZE];
2732 struct proc_dir_entry *proc;
2733 struct block_device *bdev;
2734
2735 if (pd->pkt_dev == dev) {
2736 printk(DRIVER_NAME": Recursive setup not allowed\n");
2737 return -EBUSY;
2738 }
2739 for (i = 0; i < MAX_WRITERS; i++) {
2740 struct pktcdvd_device *pd2 = pkt_devs[i];
2741 if (!pd2)
2742 continue;
2743 if (pd2->bdev->bd_dev == dev) {
2744 printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b));
2745 return -EBUSY;
2746 }
2747 if (pd2->pkt_dev == dev) {
2748 printk(DRIVER_NAME": Can't chain pktcdvd devices\n");
2749 return -EBUSY;
2750 }
2751 }
2752
2753 bdev = bdget(dev);
2754 if (!bdev)
2755 return -ENOMEM;
2756 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2757 if (ret)
2758 return ret;
2759
2760 /* This is safe, since we have a reference from open(). */
2761 __module_get(THIS_MODULE);
2762
2763 pd->bdev = bdev;
2764 set_blocksize(bdev, CD_FRAMESIZE);
2765
2766 pkt_init_queue(pd);
2767
2768 atomic_set(&pd->cdrw.pending_bios, 0);
2769 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2770 if (IS_ERR(pd->cdrw.thread)) {
2771 printk(DRIVER_NAME": can't start kernel thread\n");
2772 ret = -ENOMEM;
2773 goto out_mem;
2774 }
2775
2776 proc = create_proc_entry(pd->name, 0, pkt_proc);
2777 if (proc) {
2778 proc->data = pd;
2779 proc->proc_fops = &pkt_proc_fops;
2780 }
2781 DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
2782 return 0;
2783
2784 out_mem:
2785 blkdev_put(bdev);
2786 /* This is safe: open() is still holding a reference. */
2787 module_put(THIS_MODULE);
2788 return ret;
2789 }
2790
2791 static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
2792 {
2793 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2794
2795 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
2796
2797 switch (cmd) {
2798 /*
2799 * forward selected CDROM ioctls to CD-ROM, for UDF
2800 */
2801 case CDROMMULTISESSION:
2802 case CDROMREADTOCENTRY:
2803 case CDROM_LAST_WRITTEN:
2804 case CDROM_SEND_PACKET:
2805 case SCSI_IOCTL_SEND_COMMAND:
2806 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2807
2808 case CDROMEJECT:
2809 /*
2810 * The door gets locked when the device is opened, so we
2811 * have to unlock it or else the eject command fails.
2812 */
2813 if (pd->refcnt == 1)
2814 pkt_lock_door(pd, 0);
2815 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
2816
2817 default:
2818 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
2819 return -ENOTTY;
2820 }
2821
2822 return 0;
2823 }
2824
2825 static int pkt_media_changed(struct gendisk *disk)
2826 {
2827 struct pktcdvd_device *pd = disk->private_data;
2828 struct gendisk *attached_disk;
2829
2830 if (!pd)
2831 return 0;
2832 if (!pd->bdev)
2833 return 0;
2834 attached_disk = pd->bdev->bd_disk;
2835 if (!attached_disk)
2836 return 0;
2837 return attached_disk->fops->media_changed(attached_disk);
2838 }
2839
2840 static struct block_device_operations pktcdvd_ops = {
2841 .owner = THIS_MODULE,
2842 .open = pkt_open,
2843 .release = pkt_close,
2844 .ioctl = pkt_ioctl,
2845 .media_changed = pkt_media_changed,
2846 };
2847
2848 /*
2849 * Set up mapping from pktcdvd device to CD-ROM device.
2850 */
2851 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
2852 {
2853 int idx;
2854 int ret = -ENOMEM;
2855 struct pktcdvd_device *pd;
2856 struct gendisk *disk;
2857
2858 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2859
2860 for (idx = 0; idx < MAX_WRITERS; idx++)
2861 if (!pkt_devs[idx])
2862 break;
2863 if (idx == MAX_WRITERS) {
2864 printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS);
2865 ret = -EBUSY;
2866 goto out_mutex;
2867 }
2868
2869 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
2870 if (!pd)
2871 goto out_mutex;
2872
2873 pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
2874 sizeof(struct pkt_rb_node));
2875 if (!pd->rb_pool)
2876 goto out_mem;
2877
2878 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2879 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2880 spin_lock_init(&pd->cdrw.active_list_lock);
2881
2882 spin_lock_init(&pd->lock);
2883 spin_lock_init(&pd->iosched.lock);
2884 sprintf(pd->name, DRIVER_NAME"%d", idx);
2885 init_waitqueue_head(&pd->wqueue);
2886 pd->bio_queue = RB_ROOT;
2887
2888 pd->write_congestion_on = write_congestion_on;
2889 pd->write_congestion_off = write_congestion_off;
2890
2891 disk = alloc_disk(1);
2892 if (!disk)
2893 goto out_mem;
2894 pd->disk = disk;
2895 disk->major = pktdev_major;
2896 disk->first_minor = idx;
2897 disk->fops = &pktcdvd_ops;
2898 disk->flags = GENHD_FL_REMOVABLE;
2899 strcpy(disk->disk_name, pd->name);
2900 disk->private_data = pd;
2901 disk->queue = blk_alloc_queue(GFP_KERNEL);
2902 if (!disk->queue)
2903 goto out_mem2;
2904
2905 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2906 ret = pkt_new_dev(pd, dev);
2907 if (ret)
2908 goto out_new_dev;
2909
2910 add_disk(disk);
2911
2912 pkt_sysfs_dev_new(pd);
2913 pkt_debugfs_dev_new(pd);
2914
2915 pkt_devs[idx] = pd;
2916 if (pkt_dev)
2917 *pkt_dev = pd->pkt_dev;
2918
2919 mutex_unlock(&ctl_mutex);
2920 return 0;
2921
2922 out_new_dev:
2923 blk_cleanup_queue(disk->queue);
2924 out_mem2:
2925 put_disk(disk);
2926 out_mem:
2927 if (pd->rb_pool)
2928 mempool_destroy(pd->rb_pool);
2929 kfree(pd);
2930 out_mutex:
2931 mutex_unlock(&ctl_mutex);
2932 printk(DRIVER_NAME": setup of pktcdvd device failed\n");
2933 return ret;
2934 }
2935
2936 /*
2937 * Tear down mapping from pktcdvd device to CD-ROM device.
2938 */
2939 static int pkt_remove_dev(dev_t pkt_dev)
2940 {
2941 struct pktcdvd_device *pd;
2942 int idx;
2943 int ret = 0;
2944
2945 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2946
2947 for (idx = 0; idx < MAX_WRITERS; idx++) {
2948 pd = pkt_devs[idx];
2949 if (pd && (pd->pkt_dev == pkt_dev))
2950 break;
2951 }
2952 if (idx == MAX_WRITERS) {
2953 DPRINTK(DRIVER_NAME": dev not setup\n");
2954 ret = -ENXIO;
2955 goto out;
2956 }
2957
2958 if (pd->refcnt > 0) {
2959 ret = -EBUSY;
2960 goto out;
2961 }
2962 if (!IS_ERR(pd->cdrw.thread))
2963 kthread_stop(pd->cdrw.thread);
2964
2965 pkt_devs[idx] = NULL;
2966
2967 pkt_debugfs_dev_remove(pd);
2968 pkt_sysfs_dev_remove(pd);
2969
2970 blkdev_put(pd->bdev);
2971
2972 remove_proc_entry(pd->name, pkt_proc);
2973 DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name);
2974
2975 del_gendisk(pd->disk);
2976 blk_cleanup_queue(pd->disk->queue);
2977 put_disk(pd->disk);
2978
2979 mempool_destroy(pd->rb_pool);
2980 kfree(pd);
2981
2982 /* This is safe: open() is still holding a reference. */
2983 module_put(THIS_MODULE);
2984
2985 out:
2986 mutex_unlock(&ctl_mutex);
2987 return ret;
2988 }
2989
2990 static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
2991 {
2992 struct pktcdvd_device *pd;
2993
2994 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
2995
2996 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
2997 if (pd) {
2998 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
2999 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
3000 } else {
3001 ctrl_cmd->dev = 0;
3002 ctrl_cmd->pkt_dev = 0;
3003 }
3004 ctrl_cmd->num_devices = MAX_WRITERS;
3005
3006 mutex_unlock(&ctl_mutex);
3007 }
3008
3009 static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
3010 {
3011 void __user *argp = (void __user *)arg;
3012 struct pkt_ctrl_command ctrl_cmd;
3013 int ret = 0;
3014 dev_t pkt_dev = 0;
3015
3016 if (cmd != PACKET_CTRL_CMD)
3017 return -ENOTTY;
3018
3019 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
3020 return -EFAULT;
3021
3022 switch (ctrl_cmd.command) {
3023 case PKT_CTRL_CMD_SETUP:
3024 if (!capable(CAP_SYS_ADMIN))
3025 return -EPERM;
3026 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
3027 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
3028 break;
3029 case PKT_CTRL_CMD_TEARDOWN:
3030 if (!capable(CAP_SYS_ADMIN))
3031 return -EPERM;
3032 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
3033 break;
3034 case PKT_CTRL_CMD_STATUS:
3035 pkt_get_status(&ctrl_cmd);
3036 break;
3037 default:
3038 return -ENOTTY;
3039 }
3040
3041 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
3042 return -EFAULT;
3043 return ret;
3044 }
3045
3046
3047 static const struct file_operations pkt_ctl_fops = {
3048 .ioctl = pkt_ctl_ioctl,
3049 .owner = THIS_MODULE,
3050 };
3051
3052 static struct miscdevice pkt_misc = {
3053 .minor = MISC_DYNAMIC_MINOR,
3054 .name = DRIVER_NAME,
3055 .fops = &pkt_ctl_fops
3056 };
3057
3058 static int __init pkt_init(void)
3059 {
3060 int ret;
3061
3062 mutex_init(&ctl_mutex);
3063
3064 psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
3065 sizeof(struct packet_stacked_data));
3066 if (!psd_pool)
3067 return -ENOMEM;
3068
3069 ret = register_blkdev(pktdev_major, DRIVER_NAME);
3070 if (ret < 0) {
3071 printk(DRIVER_NAME": Unable to register block device\n");
3072 goto out2;
3073 }
3074 if (!pktdev_major)
3075 pktdev_major = ret;
3076
3077 ret = pkt_sysfs_init();
3078 if (ret)
3079 goto out;
3080
3081 pkt_debugfs_init();
3082
3083 ret = misc_register(&pkt_misc);
3084 if (ret) {
3085 printk(DRIVER_NAME": Unable to register misc device\n");
3086 goto out_misc;
3087 }
3088
3089 pkt_proc = proc_mkdir(DRIVER_NAME, proc_root_driver);
3090
3091 return 0;
3092
3093 out_misc:
3094 pkt_debugfs_cleanup();
3095 pkt_sysfs_cleanup();
3096 out:
3097 unregister_blkdev(pktdev_major, DRIVER_NAME);
3098 out2:
3099 mempool_destroy(psd_pool);
3100 return ret;
3101 }
3102
3103 static void __exit pkt_exit(void)
3104 {
3105 remove_proc_entry(DRIVER_NAME, proc_root_driver);
3106 misc_deregister(&pkt_misc);
3107
3108 pkt_debugfs_cleanup();
3109 pkt_sysfs_cleanup();
3110
3111 unregister_blkdev(pktdev_major, DRIVER_NAME);
3112 mempool_destroy(psd_pool);
3113 }
3114
3115 MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3116 MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3117 MODULE_LICENSE("GPL");
3118
3119 module_init(pkt_init);
3120 module_exit(pkt_exit);
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