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