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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
adb9250a | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
1da177e4 LT |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
a676f8d0 PO |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. | |
1da177e4 LT |
11 | * |
12 | * Theory of operation: | |
13 | * | |
a676f8d0 PO |
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. | |
1da177e4 LT |
44 | * |
45 | *************************************************************************/ | |
46 | ||
1da177e4 | 47 | #include <linux/pktcdvd.h> |
1da177e4 LT |
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> | |
7dfb7103 | 58 | #include <linux/freezer.h> |
1657f824 | 59 | #include <linux/mutex.h> |
1da177e4 LT |
60 | #include <scsi/scsi_cmnd.h> |
61 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 62 | #include <scsi/scsi.h> |
32694850 TM |
63 | #include <linux/debugfs.h> |
64 | #include <linux/device.h> | |
1da177e4 LT |
65 | |
66 | #include <asm/uaccess.h> | |
67 | ||
7822082d TM |
68 | #define DRIVER_NAME "pktcdvd" |
69 | ||
1da177e4 LT |
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; | |
add21660 | 88 | static int pktdev_major; |
0a0fc960 TM |
89 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
90 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 91 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
92 | static mempool_t *psd_pool; |
93 | ||
32694850 TM |
94 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
95 | static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */ | |
96 | ||
97 | /* forward declaration */ | |
98 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
99 | static int pkt_remove_dev(dev_t pkt_dev); | |
100 | static int pkt_seq_show(struct seq_file *m, void *p); | |
101 | ||
102 | ||
103 | ||
104 | /* | |
105 | * create and register a pktcdvd kernel object. | |
106 | */ | |
107 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
108 | const char* name, | |
109 | struct kobject* parent, | |
110 | struct kobj_type* ktype) | |
111 | { | |
112 | struct pktcdvd_kobj *p; | |
89c42606 GKH |
113 | int error; |
114 | ||
32694850 TM |
115 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
116 | if (!p) | |
117 | return NULL; | |
32694850 | 118 | p->pd = pd; |
89c42606 GKH |
119 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
120 | if (error) { | |
d17a18dd | 121 | kobject_put(&p->kobj); |
32694850 | 122 | return NULL; |
d17a18dd | 123 | } |
89c42606 | 124 | kobject_uevent(&p->kobj, KOBJ_ADD); |
32694850 TM |
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) | |
c10997f6 | 133 | kobject_put(&p->kobj); |
32694850 TM |
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) \ | |
7b595756 | 152 | static struct attribute _obj = { .name = _name, .mode = _mode } |
32694850 TM |
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 | ||
32694850 TM |
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; | |
32694850 | 260 | |
83f3aa3d | 261 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
32694850 TM |
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 | |
83f3aa3d | 269 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
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 | |
83f3aa3d | 277 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
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) { | |
1ff9f542 GKH |
305 | pd->dev = device_create(class_pktcdvd, NULL, pd->pkt_dev, NULL, |
306 | "%s", pd->name); | |
6013c12b TJ |
307 | if (IS_ERR(pd->dev)) |
308 | pd->dev = NULL; | |
32694850 | 309 | } |
6013c12b | 310 | if (pd->dev) { |
32694850 | 311 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
6013c12b | 312 | &pd->dev->kobj, |
32694850 TM |
313 | &kobj_pkt_type_stat); |
314 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
6013c12b | 315 | &pd->dev->kobj, |
32694850 TM |
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) | |
6013c12b | 325 | device_destroy(class_pktcdvd, pd->pkt_dev); |
32694850 TM |
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; | |
fffe487d | 363 | |
83f3aa3d | 364 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
fffe487d TH |
365 | /* pkt_setup_dev() expects caller to hold reference to self */ |
366 | if (!try_module_get(THIS_MODULE)) | |
367 | return -ENODEV; | |
368 | ||
32694850 | 369 | pkt_setup_dev(MKDEV(major, minor), NULL); |
fffe487d TH |
370 | |
371 | module_put(THIS_MODULE); | |
372 | ||
32694850 TM |
373 | return count; |
374 | } | |
fffe487d | 375 | |
32694850 TM |
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; | |
83f3aa3d | 383 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
32694850 TM |
384 | pkt_remove_dev(MKDEV(major, minor)); |
385 | return count; | |
386 | } | |
387 | return -EINVAL; | |
388 | } | |
389 | ||
390 | static struct class_attribute class_pktcdvd_attrs[] = { | |
391 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
392 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
393 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
394 | __ATTR_NULL | |
395 | }; | |
396 | ||
397 | ||
398 | static int pkt_sysfs_init(void) | |
399 | { | |
400 | int ret = 0; | |
401 | ||
402 | /* | |
403 | * create control files in sysfs | |
404 | * /sys/class/pktcdvd/... | |
405 | */ | |
406 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
407 | if (!class_pktcdvd) | |
408 | return -ENOMEM; | |
409 | class_pktcdvd->name = DRIVER_NAME; | |
410 | class_pktcdvd->owner = THIS_MODULE; | |
411 | class_pktcdvd->class_release = class_pktcdvd_release; | |
412 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
413 | ret = class_register(class_pktcdvd); | |
414 | if (ret) { | |
415 | kfree(class_pktcdvd); | |
416 | class_pktcdvd = NULL; | |
417 | printk(DRIVER_NAME": failed to create class pktcdvd\n"); | |
418 | return ret; | |
419 | } | |
420 | return 0; | |
421 | } | |
422 | ||
423 | static void pkt_sysfs_cleanup(void) | |
424 | { | |
425 | if (class_pktcdvd) | |
426 | class_destroy(class_pktcdvd); | |
427 | class_pktcdvd = NULL; | |
428 | } | |
429 | ||
430 | /******************************************************************** | |
431 | entries in debugfs | |
432 | ||
433 | /debugfs/pktcdvd[0-7]/ | |
434 | info | |
435 | ||
436 | *******************************************************************/ | |
437 | ||
438 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
439 | { | |
440 | return pkt_seq_show(m, p); | |
441 | } | |
442 | ||
443 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
444 | { | |
445 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
446 | } | |
447 | ||
2b8693c0 | 448 | static const struct file_operations debug_fops = { |
32694850 TM |
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 | ||
1da177e4 LT |
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)) { | |
7822082d | 510 | VPRINTK(DRIVER_NAME": queue empty\n"); |
1da177e4 LT |
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 | ||
1107d2e0 | 532 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
1da177e4 LT |
533 | if (!bvl) |
534 | goto no_bvl; | |
1da177e4 LT |
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 | */ | |
e1bc89bc | 551 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
552 | { |
553 | int i; | |
554 | struct packet_data *pkt; | |
555 | ||
1107d2e0 | 556 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
557 | if (!pkt) |
558 | goto no_pkt; | |
1da177e4 | 559 | |
e1bc89bc PO |
560 | pkt->frames = frames; |
561 | pkt->w_bio = pkt_bio_alloc(frames); | |
1da177e4 LT |
562 | if (!pkt->w_bio) |
563 | goto no_bio; | |
564 | ||
e1bc89bc | 565 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
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 | ||
e1bc89bc | 573 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
574 | struct bio *bio = pkt_bio_alloc(1); |
575 | if (!bio) | |
576 | goto no_rd_bio; | |
577 | pkt->r_bios[i] = bio; | |
578 | } | |
579 | ||
580 | return pkt; | |
581 | ||
582 | no_rd_bio: | |
e1bc89bc | 583 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
584 | struct bio *bio = pkt->r_bios[i]; |
585 | if (bio) | |
586 | bio_put(bio); | |
587 | } | |
588 | ||
589 | no_page: | |
e1bc89bc | 590 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
591 | if (pkt->pages[i]) |
592 | __free_page(pkt->pages[i]); | |
593 | bio_put(pkt->w_bio); | |
594 | no_bio: | |
595 | kfree(pkt); | |
596 | no_pkt: | |
597 | return NULL; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Free a packet_data struct | |
602 | */ | |
603 | static void pkt_free_packet_data(struct packet_data *pkt) | |
604 | { | |
605 | int i; | |
606 | ||
e1bc89bc | 607 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
608 | struct bio *bio = pkt->r_bios[i]; |
609 | if (bio) | |
610 | bio_put(bio); | |
611 | } | |
e1bc89bc | 612 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
613 | __free_page(pkt->pages[i]); |
614 | bio_put(pkt->w_bio); | |
615 | kfree(pkt); | |
616 | } | |
617 | ||
618 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
619 | { | |
620 | struct packet_data *pkt, *next; | |
621 | ||
622 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
623 | ||
624 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
625 | pkt_free_packet_data(pkt); | |
626 | } | |
e1bc89bc | 627 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
628 | } |
629 | ||
630 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
631 | { | |
632 | struct packet_data *pkt; | |
633 | ||
e1bc89bc PO |
634 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
635 | ||
1da177e4 | 636 | while (nr_packets > 0) { |
e1bc89bc | 637 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
638 | if (!pkt) { |
639 | pkt_shrink_pktlist(pd); | |
640 | return 0; | |
641 | } | |
642 | pkt->id = nr_packets; | |
643 | pkt->pd = pd; | |
644 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
645 | nr_packets--; | |
646 | } | |
647 | return 1; | |
648 | } | |
649 | ||
1da177e4 LT |
650 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
651 | { | |
652 | struct rb_node *n = rb_next(&node->rb_node); | |
653 | if (!n) | |
654 | return NULL; | |
655 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
656 | } | |
657 | ||
ac893963 | 658 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
659 | { |
660 | rb_erase(&node->rb_node, &pd->bio_queue); | |
661 | mempool_free(node, pd->rb_pool); | |
662 | pd->bio_queue_size--; | |
663 | BUG_ON(pd->bio_queue_size < 0); | |
664 | } | |
665 | ||
666 | /* | |
667 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
668 | */ | |
669 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
670 | { | |
671 | struct rb_node *n = pd->bio_queue.rb_node; | |
672 | struct rb_node *next; | |
673 | struct pkt_rb_node *tmp; | |
674 | ||
675 | if (!n) { | |
676 | BUG_ON(pd->bio_queue_size > 0); | |
677 | return NULL; | |
678 | } | |
679 | ||
680 | for (;;) { | |
681 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
682 | if (s <= tmp->bio->bi_sector) | |
683 | next = n->rb_left; | |
684 | else | |
685 | next = n->rb_right; | |
686 | if (!next) | |
687 | break; | |
688 | n = next; | |
689 | } | |
690 | ||
691 | if (s > tmp->bio->bi_sector) { | |
692 | tmp = pkt_rbtree_next(tmp); | |
693 | if (!tmp) | |
694 | return NULL; | |
695 | } | |
696 | BUG_ON(s > tmp->bio->bi_sector); | |
697 | return tmp; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Insert a node into the pd->bio_queue rb tree. | |
702 | */ | |
703 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
704 | { | |
705 | struct rb_node **p = &pd->bio_queue.rb_node; | |
706 | struct rb_node *parent = NULL; | |
707 | sector_t s = node->bio->bi_sector; | |
708 | struct pkt_rb_node *tmp; | |
709 | ||
710 | while (*p) { | |
711 | parent = *p; | |
712 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
713 | if (s < tmp->bio->bi_sector) | |
714 | p = &(*p)->rb_left; | |
715 | else | |
716 | p = &(*p)->rb_right; | |
717 | } | |
718 | rb_link_node(&node->rb_node, parent, p); | |
719 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
720 | pd->bio_queue_size++; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Add a bio to a single linked list defined by its head and tail pointers. | |
725 | */ | |
ac893963 | 726 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) |
1da177e4 LT |
727 | { |
728 | bio->bi_next = NULL; | |
729 | if (*list_tail) { | |
730 | BUG_ON((*list_head) == NULL); | |
731 | (*list_tail)->bi_next = bio; | |
732 | (*list_tail) = bio; | |
733 | } else { | |
734 | BUG_ON((*list_head) != NULL); | |
735 | (*list_head) = bio; | |
736 | (*list_tail) = bio; | |
737 | } | |
738 | } | |
739 | ||
740 | /* | |
741 | * Remove and return the first bio from a single linked list defined by its | |
742 | * head and tail pointers. | |
743 | */ | |
744 | static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) | |
745 | { | |
746 | struct bio *bio; | |
747 | ||
748 | if (*list_head == NULL) | |
749 | return NULL; | |
750 | ||
751 | bio = *list_head; | |
752 | *list_head = bio->bi_next; | |
753 | if (*list_head == NULL) | |
754 | *list_tail = NULL; | |
755 | ||
756 | bio->bi_next = NULL; | |
757 | return bio; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Send a packet_command to the underlying block device and | |
762 | * wait for completion. | |
763 | */ | |
764 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
765 | { | |
165125e1 | 766 | struct request_queue *q = bdev_get_queue(pd->bdev); |
1da177e4 | 767 | struct request *rq; |
406c9b60 CH |
768 | int ret = 0; |
769 | ||
770 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
771 | WRITE : READ, __GFP_WAIT); | |
772 | ||
773 | if (cgc->buflen) { | |
774 | if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT)) | |
775 | goto out; | |
776 | } | |
1da177e4 | 777 | |
91e4ee38 | 778 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
406c9b60 | 779 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
1da177e4 | 780 | |
1da177e4 | 781 | rq->timeout = 60*HZ; |
4aff5e23 JA |
782 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
783 | rq->cmd_flags |= REQ_HARDBARRIER; | |
1da177e4 | 784 | if (cgc->quiet) |
4aff5e23 | 785 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 | 786 | |
406c9b60 | 787 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
cbc31a47 AM |
788 | if (rq->errors) |
789 | ret = -EIO; | |
406c9b60 | 790 | out: |
1da177e4 | 791 | blk_put_request(rq); |
406c9b60 | 792 | return ret; |
1da177e4 LT |
793 | } |
794 | ||
795 | /* | |
796 | * A generic sense dump / resolve mechanism should be implemented across | |
797 | * all ATAPI + SCSI devices. | |
798 | */ | |
799 | static void pkt_dump_sense(struct packet_command *cgc) | |
800 | { | |
801 | static char *info[9] = { "No sense", "Recovered error", "Not ready", | |
802 | "Medium error", "Hardware error", "Illegal request", | |
803 | "Unit attention", "Data protect", "Blank check" }; | |
804 | int i; | |
805 | struct request_sense *sense = cgc->sense; | |
806 | ||
7822082d | 807 | printk(DRIVER_NAME":"); |
1da177e4 LT |
808 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
809 | printk(" %02x", cgc->cmd[i]); | |
810 | printk(" - "); | |
811 | ||
812 | if (sense == NULL) { | |
813 | printk("no sense\n"); | |
814 | return; | |
815 | } | |
816 | ||
817 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); | |
818 | ||
819 | if (sense->sense_key > 8) { | |
820 | printk(" (INVALID)\n"); | |
821 | return; | |
822 | } | |
823 | ||
824 | printk(" (%s)\n", info[sense->sense_key]); | |
825 | } | |
826 | ||
827 | /* | |
828 | * flush the drive cache to media | |
829 | */ | |
830 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
831 | { | |
832 | struct packet_command cgc; | |
833 | ||
834 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
835 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
836 | cgc.quiet = 1; | |
837 | ||
838 | /* | |
839 | * the IMMED bit -- we default to not setting it, although that | |
840 | * would allow a much faster close, this is safer | |
841 | */ | |
842 | #if 0 | |
843 | cgc.cmd[1] = 1 << 1; | |
844 | #endif | |
845 | return pkt_generic_packet(pd, &cgc); | |
846 | } | |
847 | ||
848 | /* | |
849 | * speed is given as the normal factor, e.g. 4 for 4x | |
850 | */ | |
05680d86 PO |
851 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
852 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
853 | { |
854 | struct packet_command cgc; | |
855 | struct request_sense sense; | |
856 | int ret; | |
857 | ||
858 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
859 | cgc.sense = &sense; | |
860 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
861 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
862 | cgc.cmd[3] = read_speed & 0xff; | |
863 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
864 | cgc.cmd[5] = write_speed & 0xff; | |
865 | ||
866 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
867 | pkt_dump_sense(&cgc); | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
872 | /* | |
873 | * Queue a bio for processing by the low-level CD device. Must be called | |
874 | * from process context. | |
875 | */ | |
46c271be | 876 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
877 | { |
878 | spin_lock(&pd->iosched.lock); | |
879 | if (bio_data_dir(bio) == READ) { | |
880 | pkt_add_list_last(bio, &pd->iosched.read_queue, | |
881 | &pd->iosched.read_queue_tail); | |
1da177e4 LT |
882 | } else { |
883 | pkt_add_list_last(bio, &pd->iosched.write_queue, | |
884 | &pd->iosched.write_queue_tail); | |
885 | } | |
886 | spin_unlock(&pd->iosched.lock); | |
887 | ||
888 | atomic_set(&pd->iosched.attention, 1); | |
889 | wake_up(&pd->wqueue); | |
890 | } | |
891 | ||
892 | /* | |
893 | * Process the queued read/write requests. This function handles special | |
894 | * requirements for CDRW drives: | |
895 | * - A cache flush command must be inserted before a read request if the | |
896 | * previous request was a write. | |
46c271be | 897 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 898 | * than necessary. |
46c271be PO |
899 | * - Optimize for throughput at the expense of latency. This means that streaming |
900 | * writes will never be interrupted by a read, but if the drive has to seek | |
901 | * before the next write, switch to reading instead if there are any pending | |
902 | * read requests. | |
1da177e4 LT |
903 | * - Set the read speed according to current usage pattern. When only reading |
904 | * from the device, it's best to use the highest possible read speed, but | |
905 | * when switching often between reading and writing, it's better to have the | |
906 | * same read and write speeds. | |
1da177e4 LT |
907 | */ |
908 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
909 | { | |
1da177e4 LT |
910 | |
911 | if (atomic_read(&pd->iosched.attention) == 0) | |
912 | return; | |
913 | atomic_set(&pd->iosched.attention, 0); | |
914 | ||
1da177e4 LT |
915 | for (;;) { |
916 | struct bio *bio; | |
46c271be | 917 | int reads_queued, writes_queued; |
1da177e4 LT |
918 | |
919 | spin_lock(&pd->iosched.lock); | |
920 | reads_queued = (pd->iosched.read_queue != NULL); | |
921 | writes_queued = (pd->iosched.write_queue != NULL); | |
1da177e4 LT |
922 | spin_unlock(&pd->iosched.lock); |
923 | ||
924 | if (!reads_queued && !writes_queued) | |
925 | break; | |
926 | ||
927 | if (pd->iosched.writing) { | |
46c271be PO |
928 | int need_write_seek = 1; |
929 | spin_lock(&pd->iosched.lock); | |
930 | bio = pd->iosched.write_queue; | |
931 | spin_unlock(&pd->iosched.lock); | |
932 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
933 | need_write_seek = 0; | |
934 | if (need_write_seek && reads_queued) { | |
1da177e4 | 935 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
7822082d | 936 | VPRINTK(DRIVER_NAME": write, waiting\n"); |
1da177e4 LT |
937 | break; |
938 | } | |
939 | pkt_flush_cache(pd); | |
940 | pd->iosched.writing = 0; | |
941 | } | |
942 | } else { | |
943 | if (!reads_queued && writes_queued) { | |
944 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
7822082d | 945 | VPRINTK(DRIVER_NAME": read, waiting\n"); |
1da177e4 LT |
946 | break; |
947 | } | |
948 | pd->iosched.writing = 1; | |
949 | } | |
950 | } | |
951 | ||
952 | spin_lock(&pd->iosched.lock); | |
953 | if (pd->iosched.writing) { | |
954 | bio = pkt_get_list_first(&pd->iosched.write_queue, | |
955 | &pd->iosched.write_queue_tail); | |
956 | } else { | |
957 | bio = pkt_get_list_first(&pd->iosched.read_queue, | |
958 | &pd->iosched.read_queue_tail); | |
959 | } | |
960 | spin_unlock(&pd->iosched.lock); | |
961 | ||
962 | if (!bio) | |
963 | continue; | |
964 | ||
965 | if (bio_data_dir(bio) == READ) | |
966 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
46c271be | 967 | else { |
1da177e4 | 968 | pd->iosched.successive_reads = 0; |
46c271be PO |
969 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
970 | } | |
1da177e4 LT |
971 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
972 | if (pd->read_speed == pd->write_speed) { | |
973 | pd->read_speed = MAX_SPEED; | |
974 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
975 | } | |
976 | } else { | |
977 | if (pd->read_speed != pd->write_speed) { | |
978 | pd->read_speed = pd->write_speed; | |
979 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
980 | } | |
981 | } | |
982 | ||
983 | atomic_inc(&pd->cdrw.pending_bios); | |
984 | generic_make_request(bio); | |
985 | } | |
986 | } | |
987 | ||
988 | /* | |
989 | * Special care is needed if the underlying block device has a small | |
990 | * max_phys_segments value. | |
991 | */ | |
165125e1 | 992 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 LT |
993 | { |
994 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { | |
995 | /* | |
996 | * The cdrom device can handle one segment/frame | |
997 | */ | |
998 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
999 | return 0; | |
1000 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { | |
1001 | /* | |
1002 | * We can handle this case at the expense of some extra memory | |
1003 | * copies during write operations | |
1004 | */ | |
1005 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
1006 | return 0; | |
1007 | } else { | |
7822082d | 1008 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); |
1da177e4 LT |
1009 | return -EIO; |
1010 | } | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page | |
1015 | */ | |
1016 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) | |
1017 | { | |
1018 | unsigned int copy_size = CD_FRAMESIZE; | |
1019 | ||
1020 | while (copy_size > 0) { | |
1021 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); | |
1022 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + | |
1023 | src_bvl->bv_offset + offs; | |
1024 | void *vto = page_address(dst_page) + dst_offs; | |
1025 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); | |
1026 | ||
1027 | BUG_ON(len < 0); | |
1028 | memcpy(vto, vfrom, len); | |
1029 | kunmap_atomic(vfrom, KM_USER0); | |
1030 | ||
1031 | seg++; | |
1032 | offs = 0; | |
1033 | dst_offs += len; | |
1034 | copy_size -= len; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Copy all data for this packet to pkt->pages[], so that | |
1040 | * a) The number of required segments for the write bio is minimized, which | |
1041 | * is necessary for some scsi controllers. | |
1042 | * b) The data can be used as cache to avoid read requests if we receive a | |
1043 | * new write request for the same zone. | |
1044 | */ | |
72772323 | 1045 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
1046 | { |
1047 | int f, p, offs; | |
1048 | ||
1049 | /* Copy all data to pkt->pages[] */ | |
1050 | p = 0; | |
1051 | offs = 0; | |
1052 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1053 | if (bvec[f].bv_page != pkt->pages[p]) { |
1054 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; | |
1da177e4 LT |
1055 | void *vto = page_address(pkt->pages[p]) + offs; |
1056 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
1057 | kunmap_atomic(vfrom, KM_USER0); | |
72772323 PO |
1058 | bvec[f].bv_page = pkt->pages[p]; |
1059 | bvec[f].bv_offset = offs; | |
1da177e4 | 1060 | } else { |
72772323 | 1061 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
1062 | } |
1063 | offs += CD_FRAMESIZE; | |
1064 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
1065 | offs = 0; |
1066 | p++; | |
1067 | } | |
1068 | } | |
1069 | } | |
1070 | ||
6712ecf8 | 1071 | static void pkt_end_io_read(struct bio *bio, int err) |
1da177e4 LT |
1072 | { |
1073 | struct packet_data *pkt = bio->bi_private; | |
1074 | struct pktcdvd_device *pd = pkt->pd; | |
1075 | BUG_ON(!pd); | |
1076 | ||
1da177e4 LT |
1077 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, |
1078 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); | |
1079 | ||
1080 | if (err) | |
1081 | atomic_inc(&pkt->io_errors); | |
1082 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
1083 | atomic_inc(&pkt->run_sm); | |
1084 | wake_up(&pd->wqueue); | |
1085 | } | |
1086 | pkt_bio_finished(pd); | |
1da177e4 LT |
1087 | } |
1088 | ||
6712ecf8 | 1089 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
1da177e4 LT |
1090 | { |
1091 | struct packet_data *pkt = bio->bi_private; | |
1092 | struct pktcdvd_device *pd = pkt->pd; | |
1093 | BUG_ON(!pd); | |
1094 | ||
1da177e4 LT |
1095 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); |
1096 | ||
1097 | pd->stats.pkt_ended++; | |
1098 | ||
1099 | pkt_bio_finished(pd); | |
1100 | atomic_dec(&pkt->io_wait); | |
1101 | atomic_inc(&pkt->run_sm); | |
1102 | wake_up(&pd->wqueue); | |
1da177e4 LT |
1103 | } |
1104 | ||
1105 | /* | |
1106 | * Schedule reads for the holes in a packet | |
1107 | */ | |
1108 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1109 | { | |
1110 | int frames_read = 0; | |
1111 | struct bio *bio; | |
1112 | int f; | |
1113 | char written[PACKET_MAX_SIZE]; | |
1114 | ||
1115 | BUG_ON(!pkt->orig_bios); | |
1116 | ||
1117 | atomic_set(&pkt->io_wait, 0); | |
1118 | atomic_set(&pkt->io_errors, 0); | |
1119 | ||
1da177e4 LT |
1120 | /* |
1121 | * Figure out which frames we need to read before we can write. | |
1122 | */ | |
1123 | memset(written, 0, sizeof(written)); | |
1124 | spin_lock(&pkt->lock); | |
1125 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1126 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1127 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1128 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1129 | BUG_ON(first_frame < 0); |
1130 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1131 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1132 | written[f] = 1; | |
1133 | } | |
1134 | spin_unlock(&pkt->lock); | |
1135 | ||
06e7ab53 PO |
1136 | if (pkt->cache_valid) { |
1137 | VPRINTK("pkt_gather_data: zone %llx cached\n", | |
1138 | (unsigned long long)pkt->sector); | |
1139 | goto out_account; | |
1140 | } | |
1141 | ||
1da177e4 LT |
1142 | /* |
1143 | * Schedule reads for missing parts of the packet. | |
1144 | */ | |
1145 | for (f = 0; f < pkt->frames; f++) { | |
761a15e7 JA |
1146 | struct bio_vec *vec; |
1147 | ||
1da177e4 LT |
1148 | int p, offset; |
1149 | if (written[f]) | |
1150 | continue; | |
1151 | bio = pkt->r_bios[f]; | |
761a15e7 | 1152 | vec = bio->bi_io_vec; |
1da177e4 LT |
1153 | bio_init(bio); |
1154 | bio->bi_max_vecs = 1; | |
1155 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
1156 | bio->bi_bdev = pd->bdev; | |
1157 | bio->bi_end_io = pkt_end_io_read; | |
1158 | bio->bi_private = pkt; | |
761a15e7 | 1159 | bio->bi_io_vec = vec; |
7e3da6c4 | 1160 | bio->bi_destructor = pkt_bio_destructor; |
1da177e4 LT |
1161 | |
1162 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1163 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1164 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", | |
1165 | f, pkt->pages[p], offset); | |
1166 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1167 | BUG(); | |
1168 | ||
1169 | atomic_inc(&pkt->io_wait); | |
1170 | bio->bi_rw = READ; | |
46c271be | 1171 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1172 | frames_read++; |
1173 | } | |
1174 | ||
1175 | out_account: | |
1176 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", | |
1177 | frames_read, (unsigned long long)pkt->sector); | |
1178 | pd->stats.pkt_started++; | |
1179 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1180 | } |
1181 | ||
1182 | /* | |
1183 | * Find a packet matching zone, or the least recently used packet if | |
1184 | * there is no match. | |
1185 | */ | |
1186 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1187 | { | |
1188 | struct packet_data *pkt; | |
1189 | ||
1190 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1191 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1192 | list_del_init(&pkt->list); | |
1193 | if (pkt->sector != zone) | |
1194 | pkt->cache_valid = 0; | |
610827de | 1195 | return pkt; |
1da177e4 LT |
1196 | } |
1197 | } | |
610827de PO |
1198 | BUG(); |
1199 | return NULL; | |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1203 | { | |
1204 | if (pkt->cache_valid) { | |
1205 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1206 | } else { | |
1207 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * recover a failed write, query for relocation if possible | |
1213 | * | |
1214 | * returns 1 if recovery is possible, or 0 if not | |
1215 | * | |
1216 | */ | |
1217 | static int pkt_start_recovery(struct packet_data *pkt) | |
1218 | { | |
1219 | /* | |
1220 | * FIXME. We need help from the file system to implement | |
1221 | * recovery handling. | |
1222 | */ | |
1223 | return 0; | |
1224 | #if 0 | |
1225 | struct request *rq = pkt->rq; | |
1226 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1227 | struct block_device *pkt_bdev; | |
1228 | struct super_block *sb = NULL; | |
1229 | unsigned long old_block, new_block; | |
1230 | sector_t new_sector; | |
1231 | ||
1232 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1233 | if (pkt_bdev) { | |
1234 | sb = get_super(pkt_bdev); | |
1235 | bdput(pkt_bdev); | |
1236 | } | |
1237 | ||
1238 | if (!sb) | |
1239 | return 0; | |
1240 | ||
1241 | if (!sb->s_op || !sb->s_op->relocate_blocks) | |
1242 | goto out; | |
1243 | ||
1244 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1245 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1246 | goto out; | |
1247 | ||
1248 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1249 | pkt->sector = new_sector; | |
1250 | ||
1251 | pkt->bio->bi_sector = new_sector; | |
1252 | pkt->bio->bi_next = NULL; | |
1253 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; | |
1254 | pkt->bio->bi_idx = 0; | |
1255 | ||
1256 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); | |
1257 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); | |
1258 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); | |
1259 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); | |
1260 | BUG_ON(pkt->bio->bi_private != pkt); | |
1261 | ||
1262 | drop_super(sb); | |
1263 | return 1; | |
1264 | ||
1265 | out: | |
1266 | drop_super(sb); | |
1267 | return 0; | |
1268 | #endif | |
1269 | } | |
1270 | ||
1271 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1272 | { | |
1273 | #if PACKET_DEBUG > 1 | |
1274 | static const char *state_name[] = { | |
1275 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1276 | }; | |
1277 | enum packet_data_state old_state = pkt->state; | |
1278 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, | |
1279 | state_name[old_state], state_name[state]); | |
1280 | #endif | |
1281 | pkt->state = state; | |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Scan the work queue to see if we can start a new packet. | |
1286 | * returns non-zero if any work was done. | |
1287 | */ | |
1288 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1289 | { | |
1290 | struct packet_data *pkt, *p; | |
1291 | struct bio *bio = NULL; | |
1292 | sector_t zone = 0; /* Suppress gcc warning */ | |
1293 | struct pkt_rb_node *node, *first_node; | |
1294 | struct rb_node *n; | |
0a0fc960 | 1295 | int wakeup; |
1da177e4 LT |
1296 | |
1297 | VPRINTK("handle_queue\n"); | |
1298 | ||
1299 | atomic_set(&pd->scan_queue, 0); | |
1300 | ||
1301 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
1302 | VPRINTK("handle_queue: no pkt\n"); | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Try to find a zone we are not already working on. | |
1308 | */ | |
1309 | spin_lock(&pd->lock); | |
1310 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1311 | if (!first_node) { | |
1312 | n = rb_first(&pd->bio_queue); | |
1313 | if (n) | |
1314 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1315 | } | |
1316 | node = first_node; | |
1317 | while (node) { | |
1318 | bio = node->bio; | |
1319 | zone = ZONE(bio->bi_sector, pd); | |
1320 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
7baeb6a5 PO |
1321 | if (p->sector == zone) { |
1322 | bio = NULL; | |
1da177e4 | 1323 | goto try_next_bio; |
7baeb6a5 | 1324 | } |
1da177e4 LT |
1325 | } |
1326 | break; | |
1327 | try_next_bio: | |
1328 | node = pkt_rbtree_next(node); | |
1329 | if (!node) { | |
1330 | n = rb_first(&pd->bio_queue); | |
1331 | if (n) | |
1332 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1333 | } | |
1334 | if (node == first_node) | |
1335 | node = NULL; | |
1336 | } | |
1337 | spin_unlock(&pd->lock); | |
1338 | if (!bio) { | |
1339 | VPRINTK("handle_queue: no bio\n"); | |
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1344 | |
1345 | pd->current_sector = zone + pd->settings.size; | |
1346 | pkt->sector = zone; | |
e1bc89bc | 1347 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1348 | pkt->write_size = 0; |
1349 | ||
1350 | /* | |
1351 | * Scan work queue for bios in the same zone and link them | |
1352 | * to this packet. | |
1353 | */ | |
1354 | spin_lock(&pd->lock); | |
1355 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); | |
1356 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { | |
1357 | bio = node->bio; | |
1358 | VPRINTK("pkt_handle_queue: found zone=%llx\n", | |
1359 | (unsigned long long)ZONE(bio->bi_sector, pd)); | |
1360 | if (ZONE(bio->bi_sector, pd) != zone) | |
1361 | break; | |
1362 | pkt_rbtree_erase(pd, node); | |
1363 | spin_lock(&pkt->lock); | |
1364 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); | |
1365 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
1366 | spin_unlock(&pkt->lock); | |
1367 | } | |
0a0fc960 TM |
1368 | /* check write congestion marks, and if bio_queue_size is |
1369 | below, wake up any waiters */ | |
1370 | wakeup = (pd->write_congestion_on > 0 | |
1371 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1372 | spin_unlock(&pd->lock); |
0a0fc960 | 1373 | if (wakeup) |
83f3aa3d | 1374 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE); |
1da177e4 LT |
1375 | |
1376 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1377 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1378 | atomic_set(&pkt->run_sm, 1); | |
1379 | ||
1380 | spin_lock(&pd->cdrw.active_list_lock); | |
1381 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1382 | spin_unlock(&pd->cdrw.active_list_lock); | |
1383 | ||
1384 | return 1; | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * Assemble a bio to write one packet and queue the bio for processing | |
1389 | * by the underlying block device. | |
1390 | */ | |
1391 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1392 | { | |
1393 | struct bio *bio; | |
1da177e4 LT |
1394 | int f; |
1395 | int frames_write; | |
72772323 | 1396 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 LT |
1397 | |
1398 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1399 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1400 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1da177e4 LT |
1401 | } |
1402 | ||
1403 | /* | |
72772323 | 1404 | * Fill-in bvec with data from orig_bios. |
1da177e4 LT |
1405 | */ |
1406 | frames_write = 0; | |
1407 | spin_lock(&pkt->lock); | |
1408 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1409 | int segment = bio->bi_idx; | |
1410 | int src_offs = 0; | |
1411 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1412 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1413 | BUG_ON(first_frame < 0); | |
1414 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1415 | for (f = first_frame; f < first_frame + num_frames; f++) { | |
1416 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); | |
1417 | ||
1418 | while (src_offs >= src_bvl->bv_len) { | |
1419 | src_offs -= src_bvl->bv_len; | |
1420 | segment++; | |
1421 | BUG_ON(segment >= bio->bi_vcnt); | |
1422 | src_bvl = bio_iovec_idx(bio, segment); | |
1423 | } | |
1424 | ||
1425 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { | |
72772323 PO |
1426 | bvec[f].bv_page = src_bvl->bv_page; |
1427 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; | |
1da177e4 LT |
1428 | } else { |
1429 | pkt_copy_bio_data(bio, segment, src_offs, | |
72772323 | 1430 | bvec[f].bv_page, bvec[f].bv_offset); |
1da177e4 LT |
1431 | } |
1432 | src_offs += CD_FRAMESIZE; | |
1433 | frames_write++; | |
1434 | } | |
1435 | } | |
1436 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); | |
1437 | spin_unlock(&pkt->lock); | |
1438 | ||
1439 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", | |
1440 | frames_write, (unsigned long long)pkt->sector); | |
1441 | BUG_ON(frames_write != pkt->write_size); | |
1442 | ||
1443 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1444 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1445 | pkt->cache_valid = 1; |
1446 | } else { | |
1447 | pkt->cache_valid = 0; | |
1448 | } | |
1449 | ||
1450 | /* Start the write request */ | |
1451 | bio_init(pkt->w_bio); | |
1452 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; | |
1453 | pkt->w_bio->bi_sector = pkt->sector; | |
1454 | pkt->w_bio->bi_bdev = pd->bdev; | |
1455 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1456 | pkt->w_bio->bi_private = pkt; | |
761a15e7 | 1457 | pkt->w_bio->bi_io_vec = bvec; |
7e3da6c4 | 1458 | pkt->w_bio->bi_destructor = pkt_bio_destructor; |
72772323 PO |
1459 | for (f = 0; f < pkt->frames; f++) |
1460 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) | |
1461 | BUG(); | |
7822082d | 1462 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1463 | |
1464 | atomic_set(&pkt->io_wait, 1); | |
1465 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1466 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1467 | } |
1468 | ||
1469 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1470 | { | |
1471 | struct bio *bio, *next; | |
1472 | ||
1473 | if (!uptodate) | |
1474 | pkt->cache_valid = 0; | |
1475 | ||
1476 | /* Finish all bios corresponding to this packet */ | |
1477 | bio = pkt->orig_bios; | |
1478 | while (bio) { | |
1479 | next = bio->bi_next; | |
1480 | bio->bi_next = NULL; | |
6712ecf8 | 1481 | bio_endio(bio, uptodate ? 0 : -EIO); |
1da177e4 LT |
1482 | bio = next; |
1483 | } | |
1484 | pkt->orig_bios = pkt->orig_bios_tail = NULL; | |
1485 | } | |
1486 | ||
1487 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1488 | { | |
1489 | int uptodate; | |
1490 | ||
1491 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); | |
1492 | ||
1493 | for (;;) { | |
1494 | switch (pkt->state) { | |
1495 | case PACKET_WAITING_STATE: | |
1496 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1497 | return; | |
1498 | ||
1499 | pkt->sleep_time = 0; | |
1500 | pkt_gather_data(pd, pkt); | |
1501 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1502 | break; | |
1503 | ||
1504 | case PACKET_READ_WAIT_STATE: | |
1505 | if (atomic_read(&pkt->io_wait) > 0) | |
1506 | return; | |
1507 | ||
1508 | if (atomic_read(&pkt->io_errors) > 0) { | |
1509 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1510 | } else { | |
1511 | pkt_start_write(pd, pkt); | |
1512 | } | |
1513 | break; | |
1514 | ||
1515 | case PACKET_WRITE_WAIT_STATE: | |
1516 | if (atomic_read(&pkt->io_wait) > 0) | |
1517 | return; | |
1518 | ||
1519 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1520 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1521 | } else { | |
1522 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1523 | } | |
1524 | break; | |
1525 | ||
1526 | case PACKET_RECOVERY_STATE: | |
1527 | if (pkt_start_recovery(pkt)) { | |
1528 | pkt_start_write(pd, pkt); | |
1529 | } else { | |
1530 | VPRINTK("No recovery possible\n"); | |
1531 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1532 | } | |
1533 | break; | |
1534 | ||
1535 | case PACKET_FINISHED_STATE: | |
1536 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1537 | pkt_finish_packet(pkt, uptodate); | |
1538 | return; | |
1539 | ||
1540 | default: | |
1541 | BUG(); | |
1542 | break; | |
1543 | } | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1548 | { | |
1549 | struct packet_data *pkt, *next; | |
1550 | ||
1551 | VPRINTK("pkt_handle_packets\n"); | |
1552 | ||
1553 | /* | |
1554 | * Run state machine for active packets | |
1555 | */ | |
1556 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1557 | if (atomic_read(&pkt->run_sm) > 0) { | |
1558 | atomic_set(&pkt->run_sm, 0); | |
1559 | pkt_run_state_machine(pd, pkt); | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Move no longer active packets to the free list | |
1565 | */ | |
1566 | spin_lock(&pd->cdrw.active_list_lock); | |
1567 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1568 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1569 | list_del(&pkt->list); | |
1570 | pkt_put_packet_data(pd, pkt); | |
1571 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1572 | atomic_set(&pd->scan_queue, 1); | |
1573 | } | |
1574 | } | |
1575 | spin_unlock(&pd->cdrw.active_list_lock); | |
1576 | } | |
1577 | ||
1578 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1579 | { | |
1580 | struct packet_data *pkt; | |
1581 | int i; | |
1582 | ||
ae7642bb | 1583 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1584 | states[i] = 0; |
1585 | ||
1586 | spin_lock(&pd->cdrw.active_list_lock); | |
1587 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1588 | states[pkt->state]++; | |
1589 | } | |
1590 | spin_unlock(&pd->cdrw.active_list_lock); | |
1591 | } | |
1592 | ||
1593 | /* | |
1594 | * kcdrwd is woken up when writes have been queued for one of our | |
1595 | * registered devices | |
1596 | */ | |
1597 | static int kcdrwd(void *foobar) | |
1598 | { | |
1599 | struct pktcdvd_device *pd = foobar; | |
1600 | struct packet_data *pkt; | |
1601 | long min_sleep_time, residue; | |
1602 | ||
1603 | set_user_nice(current, -20); | |
83144186 | 1604 | set_freezable(); |
1da177e4 LT |
1605 | |
1606 | for (;;) { | |
1607 | DECLARE_WAITQUEUE(wait, current); | |
1608 | ||
1609 | /* | |
1610 | * Wait until there is something to do | |
1611 | */ | |
1612 | add_wait_queue(&pd->wqueue, &wait); | |
1613 | for (;;) { | |
1614 | set_current_state(TASK_INTERRUPTIBLE); | |
1615 | ||
1616 | /* Check if we need to run pkt_handle_queue */ | |
1617 | if (atomic_read(&pd->scan_queue) > 0) | |
1618 | goto work_to_do; | |
1619 | ||
1620 | /* Check if we need to run the state machine for some packet */ | |
1621 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1622 | if (atomic_read(&pkt->run_sm) > 0) | |
1623 | goto work_to_do; | |
1624 | } | |
1625 | ||
1626 | /* Check if we need to process the iosched queues */ | |
1627 | if (atomic_read(&pd->iosched.attention) != 0) | |
1628 | goto work_to_do; | |
1629 | ||
1630 | /* Otherwise, go to sleep */ | |
1631 | if (PACKET_DEBUG > 1) { | |
1632 | int states[PACKET_NUM_STATES]; | |
1633 | pkt_count_states(pd, states); | |
1634 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1635 | states[0], states[1], states[2], states[3], | |
1636 | states[4], states[5]); | |
1637 | } | |
1638 | ||
1639 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1640 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1641 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1642 | min_sleep_time = pkt->sleep_time; | |
1643 | } | |
1644 | ||
1645 | generic_unplug_device(bdev_get_queue(pd->bdev)); | |
1646 | ||
1647 | VPRINTK("kcdrwd: sleeping\n"); | |
1648 | residue = schedule_timeout(min_sleep_time); | |
1649 | VPRINTK("kcdrwd: wake up\n"); | |
1650 | ||
1651 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1652 | try_to_freeze(); |
1da177e4 LT |
1653 | |
1654 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1655 | if (!pkt->sleep_time) | |
1656 | continue; | |
1657 | pkt->sleep_time -= min_sleep_time - residue; | |
1658 | if (pkt->sleep_time <= 0) { | |
1659 | pkt->sleep_time = 0; | |
1660 | atomic_inc(&pkt->run_sm); | |
1661 | } | |
1662 | } | |
1663 | ||
1da177e4 LT |
1664 | if (kthread_should_stop()) |
1665 | break; | |
1666 | } | |
1667 | work_to_do: | |
1668 | set_current_state(TASK_RUNNING); | |
1669 | remove_wait_queue(&pd->wqueue, &wait); | |
1670 | ||
1671 | if (kthread_should_stop()) | |
1672 | break; | |
1673 | ||
1674 | /* | |
1675 | * if pkt_handle_queue returns true, we can queue | |
1676 | * another request. | |
1677 | */ | |
1678 | while (pkt_handle_queue(pd)) | |
1679 | ; | |
1680 | ||
1681 | /* | |
1682 | * Handle packet state machine | |
1683 | */ | |
1684 | pkt_handle_packets(pd); | |
1685 | ||
1686 | /* | |
1687 | * Handle iosched queues | |
1688 | */ | |
1689 | pkt_iosched_process_queue(pd); | |
1690 | } | |
1691 | ||
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1696 | { | |
7822082d | 1697 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
1da177e4 LT |
1698 | printk("%u blocks, ", pd->settings.size >> 2); |
1699 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); | |
1700 | } | |
1701 | ||
1702 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1703 | { | |
1704 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1705 | ||
1706 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1707 | cgc->cmd[2] = page_code | (page_control << 6); | |
1708 | cgc->cmd[7] = cgc->buflen >> 8; | |
1709 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1710 | cgc->data_direction = CGC_DATA_READ; | |
1711 | return pkt_generic_packet(pd, cgc); | |
1712 | } | |
1713 | ||
1714 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1715 | { | |
1716 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1717 | memset(cgc->buffer, 0, 2); | |
1718 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1719 | cgc->cmd[1] = 0x10; /* PF */ | |
1720 | cgc->cmd[7] = cgc->buflen >> 8; | |
1721 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1722 | cgc->data_direction = CGC_DATA_WRITE; | |
1723 | return pkt_generic_packet(pd, cgc); | |
1724 | } | |
1725 | ||
1726 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1727 | { | |
1728 | struct packet_command cgc; | |
1729 | int ret; | |
1730 | ||
1731 | /* set up command and get the disc info */ | |
1732 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1733 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1734 | cgc.cmd[8] = cgc.buflen = 2; | |
1735 | cgc.quiet = 1; | |
1736 | ||
1737 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1738 | return ret; | |
1739 | ||
1740 | /* not all drives have the same disc_info length, so requeue | |
1741 | * packet with the length the drive tells us it can supply | |
1742 | */ | |
1743 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1744 | sizeof(di->disc_information_length); | |
1745 | ||
1746 | if (cgc.buflen > sizeof(disc_information)) | |
1747 | cgc.buflen = sizeof(disc_information); | |
1748 | ||
1749 | cgc.cmd[8] = cgc.buflen; | |
1750 | return pkt_generic_packet(pd, &cgc); | |
1751 | } | |
1752 | ||
1753 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1754 | { | |
1755 | struct packet_command cgc; | |
1756 | int ret; | |
1757 | ||
1758 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1759 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1760 | cgc.cmd[1] = type & 3; | |
1761 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1762 | cgc.cmd[5] = track & 0xff; | |
1763 | cgc.cmd[8] = 8; | |
1764 | cgc.quiet = 1; | |
1765 | ||
1766 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1767 | return ret; | |
1768 | ||
1769 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1770 | sizeof(ti->track_information_length); | |
1771 | ||
1772 | if (cgc.buflen > sizeof(track_information)) | |
1773 | cgc.buflen = sizeof(track_information); | |
1774 | ||
1775 | cgc.cmd[8] = cgc.buflen; | |
1776 | return pkt_generic_packet(pd, &cgc); | |
1777 | } | |
1778 | ||
05680d86 PO |
1779 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1780 | long *last_written) | |
1da177e4 LT |
1781 | { |
1782 | disc_information di; | |
1783 | track_information ti; | |
1784 | __u32 last_track; | |
1785 | int ret = -1; | |
1786 | ||
1787 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1788 | return ret; | |
1789 | ||
1790 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1791 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1792 | return ret; | |
1793 | ||
1794 | /* if this track is blank, try the previous. */ | |
1795 | if (ti.blank) { | |
1796 | last_track--; | |
1797 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1798 | return ret; | |
1799 | } | |
1800 | ||
1801 | /* if last recorded field is valid, return it. */ | |
1802 | if (ti.lra_v) { | |
1803 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1804 | } else { | |
1805 | /* make it up instead */ | |
1806 | *last_written = be32_to_cpu(ti.track_start) + | |
1807 | be32_to_cpu(ti.track_size); | |
1808 | if (ti.free_blocks) | |
1809 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1810 | } | |
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * write mode select package based on pd->settings | |
1816 | */ | |
05680d86 | 1817 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1818 | { |
1819 | struct packet_command cgc; | |
1820 | struct request_sense sense; | |
1821 | write_param_page *wp; | |
1822 | char buffer[128]; | |
1823 | int ret, size; | |
1824 | ||
1825 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1826 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1827 | return 0; | |
1828 | ||
1829 | memset(buffer, 0, sizeof(buffer)); | |
1830 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1831 | cgc.sense = &sense; | |
1832 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1833 | pkt_dump_sense(&cgc); | |
1834 | return ret; | |
1835 | } | |
1836 | ||
1837 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1838 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1839 | if (size > sizeof(buffer)) | |
1840 | size = sizeof(buffer); | |
1841 | ||
1842 | /* | |
1843 | * now get it all | |
1844 | */ | |
1845 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1846 | cgc.sense = &sense; | |
1847 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1848 | pkt_dump_sense(&cgc); | |
1849 | return ret; | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * write page is offset header + block descriptor length | |
1854 | */ | |
1855 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1856 | ||
1857 | wp->fp = pd->settings.fp; | |
1858 | wp->track_mode = pd->settings.track_mode; | |
1859 | wp->write_type = pd->settings.write_type; | |
1860 | wp->data_block_type = pd->settings.block_mode; | |
1861 | ||
1862 | wp->multi_session = 0; | |
1863 | ||
1864 | #ifdef PACKET_USE_LS | |
1865 | wp->link_size = 7; | |
1866 | wp->ls_v = 1; | |
1867 | #endif | |
1868 | ||
1869 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1870 | wp->session_format = 0; | |
1871 | wp->subhdr2 = 0x20; | |
1872 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1873 | wp->session_format = 0x20; | |
1874 | wp->subhdr2 = 8; | |
1875 | #if 0 | |
1876 | wp->mcn[0] = 0x80; | |
1877 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1878 | #endif | |
1879 | } else { | |
1880 | /* | |
1881 | * paranoia | |
1882 | */ | |
7822082d | 1883 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1884 | return 1; |
1885 | } | |
1886 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1887 | ||
1888 | cgc.buflen = cgc.cmd[8] = size; | |
1889 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1890 | pkt_dump_sense(&cgc); | |
1891 | return ret; | |
1892 | } | |
1893 | ||
1894 | pkt_print_settings(pd); | |
1895 | return 0; | |
1896 | } | |
1897 | ||
1898 | /* | |
7c613d59 | 1899 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1900 | */ |
ab863ec3 | 1901 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1902 | { |
ab863ec3 PO |
1903 | switch (pd->mmc3_profile) { |
1904 | case 0x1a: /* DVD+RW */ | |
1905 | case 0x12: /* DVD-RAM */ | |
1906 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1907 | return 1; | |
1908 | default: | |
1909 | break; | |
1910 | } | |
1da177e4 | 1911 | |
ab863ec3 PO |
1912 | if (!ti->packet || !ti->fp) |
1913 | return 0; | |
1da177e4 LT |
1914 | |
1915 | /* | |
1916 | * "good" settings as per Mt Fuji. | |
1917 | */ | |
ab863ec3 | 1918 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1919 | return 1; |
1da177e4 | 1920 | |
ab863ec3 | 1921 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1922 | return 1; |
1da177e4 | 1923 | |
ab863ec3 | 1924 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1925 | return 1; |
1da177e4 | 1926 | |
7822082d | 1927 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1928 | return 0; |
1da177e4 LT |
1929 | } |
1930 | ||
1931 | /* | |
7c613d59 | 1932 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1933 | */ |
7c613d59 | 1934 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1935 | { |
1936 | switch (pd->mmc3_profile) { | |
1937 | case 0x0a: /* CD-RW */ | |
1938 | case 0xffff: /* MMC3 not supported */ | |
1939 | break; | |
1940 | case 0x1a: /* DVD+RW */ | |
1941 | case 0x13: /* DVD-RW */ | |
1942 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1943 | return 1; |
1da177e4 | 1944 | default: |
7822082d | 1945 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); |
7c613d59 | 1946 | return 0; |
1da177e4 LT |
1947 | } |
1948 | ||
1949 | /* | |
1950 | * for disc type 0xff we should probably reserve a new track. | |
1951 | * but i'm not sure, should we leave this to user apps? probably. | |
1952 | */ | |
1953 | if (di->disc_type == 0xff) { | |
7822082d | 1954 | printk(DRIVER_NAME": Unknown disc. No track?\n"); |
7c613d59 | 1955 | return 0; |
1da177e4 LT |
1956 | } |
1957 | ||
1958 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
7822082d | 1959 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1960 | return 0; |
1da177e4 LT |
1961 | } |
1962 | ||
1963 | if (di->erasable == 0) { | |
7822082d | 1964 | printk(DRIVER_NAME": Disc not erasable\n"); |
7c613d59 | 1965 | return 0; |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
7822082d | 1969 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); |
7c613d59 | 1970 | return 0; |
1da177e4 LT |
1971 | } |
1972 | ||
7c613d59 | 1973 | return 1; |
1da177e4 LT |
1974 | } |
1975 | ||
05680d86 | 1976 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1977 | { |
1978 | struct packet_command cgc; | |
1979 | unsigned char buf[12]; | |
1980 | disc_information di; | |
1981 | track_information ti; | |
1982 | int ret, track; | |
1983 | ||
1984 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1985 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1986 | cgc.cmd[8] = 8; | |
1987 | ret = pkt_generic_packet(pd, &cgc); | |
1988 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1989 | ||
1990 | memset(&di, 0, sizeof(disc_information)); | |
1991 | memset(&ti, 0, sizeof(track_information)); | |
1992 | ||
1993 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
1994 | printk("failed get_disc\n"); | |
1995 | return ret; | |
1996 | } | |
1997 | ||
7c613d59 | 1998 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1999 | return -EROFS; |
1da177e4 | 2000 | |
1da177e4 LT |
2001 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
2002 | ||
2003 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
2004 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
7822082d | 2005 | printk(DRIVER_NAME": failed get_track\n"); |
1da177e4 LT |
2006 | return ret; |
2007 | } | |
2008 | ||
ab863ec3 | 2009 | if (!pkt_writable_track(pd, &ti)) { |
7822082d | 2010 | printk(DRIVER_NAME": can't write to this track\n"); |
9db91546 | 2011 | return -EROFS; |
1da177e4 LT |
2012 | } |
2013 | ||
2014 | /* | |
2015 | * we keep packet size in 512 byte units, makes it easier to | |
2016 | * deal with request calculations. | |
2017 | */ | |
2018 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
2019 | if (pd->settings.size == 0) { | |
7822082d | 2020 | printk(DRIVER_NAME": detected zero packet size!\n"); |
a460ad62 | 2021 | return -ENXIO; |
1da177e4 | 2022 | } |
d0272e78 | 2023 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
7822082d | 2024 | printk(DRIVER_NAME": packet size is too big\n"); |
9db91546 | 2025 | return -EROFS; |
d0272e78 | 2026 | } |
1da177e4 LT |
2027 | pd->settings.fp = ti.fp; |
2028 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
2029 | ||
2030 | if (ti.nwa_v) { | |
2031 | pd->nwa = be32_to_cpu(ti.next_writable); | |
2032 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * in theory we could use lra on -RW media as well and just zero | |
2037 | * blocks that haven't been written yet, but in practice that | |
2038 | * is just a no-go. we'll use that for -R, naturally. | |
2039 | */ | |
2040 | if (ti.lra_v) { | |
2041 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
2042 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2043 | } else { | |
2044 | pd->lra = 0xffffffff; | |
2045 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2046 | } | |
2047 | ||
2048 | /* | |
2049 | * fine for now | |
2050 | */ | |
2051 | pd->settings.link_loss = 7; | |
2052 | pd->settings.write_type = 0; /* packet */ | |
2053 | pd->settings.track_mode = ti.track_mode; | |
2054 | ||
2055 | /* | |
2056 | * mode1 or mode2 disc | |
2057 | */ | |
2058 | switch (ti.data_mode) { | |
2059 | case PACKET_MODE1: | |
2060 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
2061 | break; | |
2062 | case PACKET_MODE2: | |
2063 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
2064 | break; | |
2065 | default: | |
7822082d | 2066 | printk(DRIVER_NAME": unknown data mode\n"); |
9db91546 | 2067 | return -EROFS; |
1da177e4 LT |
2068 | } |
2069 | return 0; | |
2070 | } | |
2071 | ||
2072 | /* | |
2073 | * enable/disable write caching on drive | |
2074 | */ | |
05680d86 PO |
2075 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
2076 | int set) | |
1da177e4 LT |
2077 | { |
2078 | struct packet_command cgc; | |
2079 | struct request_sense sense; | |
2080 | unsigned char buf[64]; | |
2081 | int ret; | |
2082 | ||
1da177e4 LT |
2083 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
2084 | cgc.sense = &sense; | |
2085 | cgc.buflen = pd->mode_offset + 12; | |
2086 | ||
2087 | /* | |
2088 | * caching mode page might not be there, so quiet this command | |
2089 | */ | |
2090 | cgc.quiet = 1; | |
2091 | ||
2092 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
2093 | return ret; | |
2094 | ||
2095 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
2096 | ||
2097 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
2098 | ret = pkt_mode_select(pd, &cgc); | |
2099 | if (ret) { | |
7822082d | 2100 | printk(DRIVER_NAME": write caching control failed\n"); |
1da177e4 LT |
2101 | pkt_dump_sense(&cgc); |
2102 | } else if (!ret && set) | |
7822082d | 2103 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); |
1da177e4 LT |
2104 | return ret; |
2105 | } | |
2106 | ||
2107 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
2108 | { | |
2109 | struct packet_command cgc; | |
2110 | ||
2111 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2112 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
2113 | cgc.cmd[4] = lockflag ? 1 : 0; | |
2114 | return pkt_generic_packet(pd, &cgc); | |
2115 | } | |
2116 | ||
2117 | /* | |
2118 | * Returns drive maximum write speed | |
2119 | */ | |
05680d86 PO |
2120 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
2121 | unsigned *write_speed) | |
1da177e4 LT |
2122 | { |
2123 | struct packet_command cgc; | |
2124 | struct request_sense sense; | |
2125 | unsigned char buf[256+18]; | |
2126 | unsigned char *cap_buf; | |
2127 | int ret, offset; | |
2128 | ||
1da177e4 LT |
2129 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
2130 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
2131 | cgc.sense = &sense; | |
2132 | ||
2133 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2134 | if (ret) { | |
2135 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
2136 | sizeof(struct mode_page_header); | |
2137 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2138 | if (ret) { | |
2139 | pkt_dump_sense(&cgc); | |
2140 | return ret; | |
2141 | } | |
2142 | } | |
2143 | ||
2144 | offset = 20; /* Obsoleted field, used by older drives */ | |
2145 | if (cap_buf[1] >= 28) | |
2146 | offset = 28; /* Current write speed selected */ | |
2147 | if (cap_buf[1] >= 30) { | |
2148 | /* If the drive reports at least one "Logical Unit Write | |
2149 | * Speed Performance Descriptor Block", use the information | |
2150 | * in the first block. (contains the highest speed) | |
2151 | */ | |
2152 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2153 | if (num_spdb > 0) | |
2154 | offset = 34; | |
2155 | } | |
2156 | ||
2157 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | /* These tables from cdrecord - I don't have orange book */ | |
2162 | /* standard speed CD-RW (1-4x) */ | |
2163 | static char clv_to_speed[16] = { | |
2164 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2165 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2166 | }; | |
2167 | /* high speed CD-RW (-10x) */ | |
2168 | static char hs_clv_to_speed[16] = { | |
2169 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2170 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2171 | }; | |
2172 | /* ultra high speed CD-RW */ | |
2173 | static char us_clv_to_speed[16] = { | |
2174 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2175 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2176 | }; | |
2177 | ||
2178 | /* | |
2179 | * reads the maximum media speed from ATIP | |
2180 | */ | |
05680d86 PO |
2181 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2182 | unsigned *speed) | |
1da177e4 LT |
2183 | { |
2184 | struct packet_command cgc; | |
2185 | struct request_sense sense; | |
2186 | unsigned char buf[64]; | |
2187 | unsigned int size, st, sp; | |
2188 | int ret; | |
2189 | ||
2190 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2191 | cgc.sense = &sense; | |
2192 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2193 | cgc.cmd[1] = 2; | |
2194 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2195 | cgc.cmd[8] = 2; | |
2196 | ret = pkt_generic_packet(pd, &cgc); | |
2197 | if (ret) { | |
2198 | pkt_dump_sense(&cgc); | |
2199 | return ret; | |
2200 | } | |
2201 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2202 | if (size > sizeof(buf)) | |
2203 | size = sizeof(buf); | |
2204 | ||
2205 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2206 | cgc.sense = &sense; | |
2207 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2208 | cgc.cmd[1] = 2; | |
2209 | cgc.cmd[2] = 4; | |
2210 | cgc.cmd[8] = size; | |
2211 | ret = pkt_generic_packet(pd, &cgc); | |
2212 | if (ret) { | |
2213 | pkt_dump_sense(&cgc); | |
2214 | return ret; | |
2215 | } | |
2216 | ||
eaa0ff15 | 2217 | if (!(buf[6] & 0x40)) { |
7822082d | 2218 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); |
1da177e4 LT |
2219 | return 1; |
2220 | } | |
eaa0ff15 | 2221 | if (!(buf[6] & 0x4)) { |
7822082d | 2222 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2223 | return 1; |
2224 | } | |
2225 | ||
2226 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2227 | ||
2228 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2229 | ||
2230 | /* Info from cdrecord */ | |
2231 | switch (st) { | |
2232 | case 0: /* standard speed */ | |
2233 | *speed = clv_to_speed[sp]; | |
2234 | break; | |
2235 | case 1: /* high speed */ | |
2236 | *speed = hs_clv_to_speed[sp]; | |
2237 | break; | |
2238 | case 2: /* ultra high speed */ | |
2239 | *speed = us_clv_to_speed[sp]; | |
2240 | break; | |
2241 | default: | |
7822082d | 2242 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); |
1da177e4 LT |
2243 | return 1; |
2244 | } | |
2245 | if (*speed) { | |
7822082d | 2246 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); |
1da177e4 LT |
2247 | return 0; |
2248 | } else { | |
7822082d | 2249 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); |
1da177e4 LT |
2250 | return 1; |
2251 | } | |
2252 | } | |
2253 | ||
05680d86 | 2254 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2255 | { |
2256 | struct packet_command cgc; | |
2257 | struct request_sense sense; | |
2258 | int ret; | |
2259 | ||
7822082d | 2260 | VPRINTK(DRIVER_NAME": Performing OPC\n"); |
1da177e4 LT |
2261 | |
2262 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2263 | cgc.sense = &sense; | |
2264 | cgc.timeout = 60*HZ; | |
2265 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2266 | cgc.cmd[1] = 1; | |
2267 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
2268 | pkt_dump_sense(&cgc); | |
2269 | return ret; | |
2270 | } | |
2271 | ||
2272 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2273 | { | |
2274 | int ret; | |
2275 | unsigned int write_speed, media_write_speed, read_speed; | |
2276 | ||
2277 | if ((ret = pkt_probe_settings(pd))) { | |
7822082d | 2278 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); |
9db91546 | 2279 | return ret; |
1da177e4 LT |
2280 | } |
2281 | ||
2282 | if ((ret = pkt_set_write_settings(pd))) { | |
7822082d | 2283 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); |
1da177e4 LT |
2284 | return -EIO; |
2285 | } | |
2286 | ||
2287 | pkt_write_caching(pd, USE_WCACHING); | |
2288 | ||
2289 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2290 | write_speed = 16 * 177; | |
2291 | switch (pd->mmc3_profile) { | |
2292 | case 0x13: /* DVD-RW */ | |
2293 | case 0x1a: /* DVD+RW */ | |
2294 | case 0x12: /* DVD-RAM */ | |
7822082d | 2295 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2296 | break; |
2297 | default: | |
2298 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2299 | media_write_speed = 16; | |
2300 | write_speed = min(write_speed, media_write_speed * 177); | |
7822082d | 2301 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2302 | break; |
2303 | } | |
2304 | read_speed = write_speed; | |
2305 | ||
2306 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
7822082d | 2307 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); |
1da177e4 LT |
2308 | return -EIO; |
2309 | } | |
2310 | pd->write_speed = write_speed; | |
2311 | pd->read_speed = read_speed; | |
2312 | ||
2313 | if ((ret = pkt_perform_opc(pd))) { | |
7822082d | 2314 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); |
1da177e4 LT |
2315 | } |
2316 | ||
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | /* | |
2321 | * called at open time. | |
2322 | */ | |
2323 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) | |
2324 | { | |
2325 | int ret; | |
2326 | long lba; | |
165125e1 | 2327 | struct request_queue *q; |
1da177e4 LT |
2328 | |
2329 | /* | |
2330 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2331 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2332 | * so bdget() can't fail. | |
2333 | */ | |
2334 | bdget(pd->bdev->bd_dev); | |
2335 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) | |
2336 | goto out; | |
2337 | ||
8382bf2e PO |
2338 | if ((ret = bd_claim(pd->bdev, pd))) |
2339 | goto out_putdev; | |
2340 | ||
1da177e4 | 2341 | if ((ret = pkt_get_last_written(pd, &lba))) { |
7822082d | 2342 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); |
8382bf2e | 2343 | goto out_unclaim; |
1da177e4 LT |
2344 | } |
2345 | ||
2346 | set_capacity(pd->disk, lba << 2); | |
2347 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2348 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2349 | ||
2350 | q = bdev_get_queue(pd->bdev); | |
2351 | if (write) { | |
2352 | if ((ret = pkt_open_write(pd))) | |
8382bf2e | 2353 | goto out_unclaim; |
1da177e4 LT |
2354 | /* |
2355 | * Some CDRW drives can not handle writes larger than one packet, | |
2356 | * even if the size is a multiple of the packet size. | |
2357 | */ | |
2358 | spin_lock_irq(q->queue_lock); | |
2359 | blk_queue_max_sectors(q, pd->settings.size); | |
2360 | spin_unlock_irq(q->queue_lock); | |
2361 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2362 | } else { | |
2363 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2364 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2365 | } | |
2366 | ||
2367 | if ((ret = pkt_set_segment_merging(pd, q))) | |
8382bf2e | 2368 | goto out_unclaim; |
1da177e4 | 2369 | |
e1bc89bc PO |
2370 | if (write) { |
2371 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
7822082d | 2372 | printk(DRIVER_NAME": not enough memory for buffers\n"); |
e1bc89bc PO |
2373 | ret = -ENOMEM; |
2374 | goto out_unclaim; | |
2375 | } | |
7822082d | 2376 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); |
e1bc89bc | 2377 | } |
1da177e4 LT |
2378 | |
2379 | return 0; | |
2380 | ||
8382bf2e PO |
2381 | out_unclaim: |
2382 | bd_release(pd->bdev); | |
1da177e4 LT |
2383 | out_putdev: |
2384 | blkdev_put(pd->bdev); | |
2385 | out: | |
2386 | return ret; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * called when the device is closed. makes sure that the device flushes | |
2391 | * the internal cache before we close. | |
2392 | */ | |
2393 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2394 | { | |
2395 | if (flush && pkt_flush_cache(pd)) | |
7822082d | 2396 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); |
1da177e4 LT |
2397 | |
2398 | pkt_lock_door(pd, 0); | |
2399 | ||
2400 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
8382bf2e | 2401 | bd_release(pd->bdev); |
1da177e4 | 2402 | blkdev_put(pd->bdev); |
e1bc89bc PO |
2403 | |
2404 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2405 | } |
2406 | ||
2407 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) | |
2408 | { | |
2409 | if (dev_minor >= MAX_WRITERS) | |
2410 | return NULL; | |
2411 | return pkt_devs[dev_minor]; | |
2412 | } | |
2413 | ||
2414 | static int pkt_open(struct inode *inode, struct file *file) | |
2415 | { | |
2416 | struct pktcdvd_device *pd = NULL; | |
2417 | int ret; | |
2418 | ||
7822082d | 2419 | VPRINTK(DRIVER_NAME": entering open\n"); |
1da177e4 | 2420 | |
1657f824 | 2421 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2422 | pd = pkt_find_dev_from_minor(iminor(inode)); |
2423 | if (!pd) { | |
2424 | ret = -ENODEV; | |
2425 | goto out; | |
2426 | } | |
2427 | BUG_ON(pd->refcnt < 0); | |
2428 | ||
2429 | pd->refcnt++; | |
46f4e1b7 PO |
2430 | if (pd->refcnt > 1) { |
2431 | if ((file->f_mode & FMODE_WRITE) && | |
2432 | !test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2433 | ret = -EBUSY; | |
2434 | goto out_dec; | |
2435 | } | |
2436 | } else { | |
01fd9fda PO |
2437 | ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE); |
2438 | if (ret) | |
1da177e4 | 2439 | goto out_dec; |
1da177e4 LT |
2440 | /* |
2441 | * needed here as well, since ext2 (among others) may change | |
2442 | * the blocksize at mount time | |
2443 | */ | |
2444 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); | |
2445 | } | |
2446 | ||
1657f824 | 2447 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2448 | return 0; |
2449 | ||
2450 | out_dec: | |
2451 | pd->refcnt--; | |
2452 | out: | |
7822082d | 2453 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); |
1657f824 | 2454 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2455 | return ret; |
2456 | } | |
2457 | ||
2458 | static int pkt_close(struct inode *inode, struct file *file) | |
2459 | { | |
2460 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2461 | int ret = 0; | |
2462 | ||
1657f824 | 2463 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2464 | pd->refcnt--; |
2465 | BUG_ON(pd->refcnt < 0); | |
2466 | if (pd->refcnt == 0) { | |
2467 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2468 | pkt_release_dev(pd, flush); | |
2469 | } | |
1657f824 | 2470 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2471 | return ret; |
2472 | } | |
2473 | ||
2474 | ||
6712ecf8 | 2475 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
1da177e4 LT |
2476 | { |
2477 | struct packet_stacked_data *psd = bio->bi_private; | |
2478 | struct pktcdvd_device *pd = psd->pd; | |
2479 | ||
1da177e4 | 2480 | bio_put(bio); |
6712ecf8 | 2481 | bio_endio(psd->bio, err); |
1da177e4 LT |
2482 | mempool_free(psd, psd_pool); |
2483 | pkt_bio_finished(pd); | |
1da177e4 LT |
2484 | } |
2485 | ||
165125e1 | 2486 | static int pkt_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
2487 | { |
2488 | struct pktcdvd_device *pd; | |
2489 | char b[BDEVNAME_SIZE]; | |
2490 | sector_t zone; | |
2491 | struct packet_data *pkt; | |
2492 | int was_empty, blocked_bio; | |
2493 | struct pkt_rb_node *node; | |
2494 | ||
2495 | pd = q->queuedata; | |
2496 | if (!pd) { | |
7822082d | 2497 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
1da177e4 LT |
2498 | goto end_io; |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * Clone READ bios so we can have our own bi_end_io callback. | |
2503 | */ | |
2504 | if (bio_data_dir(bio) == READ) { | |
2505 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2506 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2507 | ||
2508 | psd->pd = pd; | |
2509 | psd->bio = bio; | |
2510 | cloned_bio->bi_bdev = pd->bdev; | |
2511 | cloned_bio->bi_private = psd; | |
2512 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2513 | pd->stats.secs_r += bio->bi_size >> 9; | |
46c271be | 2514 | pkt_queue_bio(pd, cloned_bio); |
1da177e4 LT |
2515 | return 0; |
2516 | } | |
2517 | ||
2518 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
7822082d | 2519 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", |
1da177e4 LT |
2520 | pd->name, (unsigned long long)bio->bi_sector); |
2521 | goto end_io; | |
2522 | } | |
2523 | ||
2524 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
7822082d | 2525 | printk(DRIVER_NAME": wrong bio size\n"); |
1da177e4 LT |
2526 | goto end_io; |
2527 | } | |
2528 | ||
2529 | blk_queue_bounce(q, &bio); | |
2530 | ||
2531 | zone = ZONE(bio->bi_sector, pd); | |
2532 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", | |
2533 | (unsigned long long)bio->bi_sector, | |
2534 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); | |
2535 | ||
2536 | /* Check if we have to split the bio */ | |
2537 | { | |
2538 | struct bio_pair *bp; | |
2539 | sector_t last_zone; | |
2540 | int first_sectors; | |
2541 | ||
2542 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); | |
2543 | if (last_zone != zone) { | |
2544 | BUG_ON(last_zone != zone + pd->settings.size); | |
2545 | first_sectors = last_zone - bio->bi_sector; | |
6feef531 | 2546 | bp = bio_split(bio, first_sectors); |
1da177e4 LT |
2547 | BUG_ON(!bp); |
2548 | pkt_make_request(q, &bp->bio1); | |
2549 | pkt_make_request(q, &bp->bio2); | |
2550 | bio_pair_release(bp); | |
2551 | return 0; | |
2552 | } | |
2553 | } | |
2554 | ||
2555 | /* | |
2556 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2557 | * just append this bio to that packet. | |
2558 | */ | |
2559 | spin_lock(&pd->cdrw.active_list_lock); | |
2560 | blocked_bio = 0; | |
2561 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2562 | if (pkt->sector == zone) { | |
2563 | spin_lock(&pkt->lock); | |
2564 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2565 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
2566 | pkt_add_list_last(bio, &pkt->orig_bios, | |
2567 | &pkt->orig_bios_tail); | |
2568 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
2569 | if ((pkt->write_size >= pkt->frames) && | |
2570 | (pkt->state == PACKET_WAITING_STATE)) { | |
2571 | atomic_inc(&pkt->run_sm); | |
2572 | wake_up(&pd->wqueue); | |
2573 | } | |
2574 | spin_unlock(&pkt->lock); | |
2575 | spin_unlock(&pd->cdrw.active_list_lock); | |
2576 | return 0; | |
2577 | } else { | |
2578 | blocked_bio = 1; | |
2579 | } | |
2580 | spin_unlock(&pkt->lock); | |
2581 | } | |
2582 | } | |
2583 | spin_unlock(&pd->cdrw.active_list_lock); | |
2584 | ||
0a0fc960 TM |
2585 | /* |
2586 | * Test if there is enough room left in the bio work queue | |
2587 | * (queue size >= congestion on mark). | |
2588 | * If not, wait till the work queue size is below the congestion off mark. | |
2589 | */ | |
2590 | spin_lock(&pd->lock); | |
2591 | if (pd->write_congestion_on > 0 | |
2592 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
83f3aa3d | 2593 | set_bdi_congested(&q->backing_dev_info, WRITE); |
0a0fc960 TM |
2594 | do { |
2595 | spin_unlock(&pd->lock); | |
2596 | congestion_wait(WRITE, HZ); | |
2597 | spin_lock(&pd->lock); | |
2598 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2599 | } | |
2600 | spin_unlock(&pd->lock); | |
2601 | ||
1da177e4 LT |
2602 | /* |
2603 | * No matching packet found. Store the bio in the work queue. | |
2604 | */ | |
2605 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2606 | node->bio = bio; |
2607 | spin_lock(&pd->lock); | |
2608 | BUG_ON(pd->bio_queue_size < 0); | |
2609 | was_empty = (pd->bio_queue_size == 0); | |
2610 | pkt_rbtree_insert(pd, node); | |
2611 | spin_unlock(&pd->lock); | |
2612 | ||
2613 | /* | |
2614 | * Wake up the worker thread. | |
2615 | */ | |
2616 | atomic_set(&pd->scan_queue, 1); | |
2617 | if (was_empty) { | |
2618 | /* This wake_up is required for correct operation */ | |
2619 | wake_up(&pd->wqueue); | |
2620 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2621 | /* | |
2622 | * This wake up is not required for correct operation, | |
2623 | * but improves performance in some cases. | |
2624 | */ | |
2625 | wake_up(&pd->wqueue); | |
2626 | } | |
2627 | return 0; | |
2628 | end_io: | |
6712ecf8 | 2629 | bio_io_error(bio); |
1da177e4 LT |
2630 | return 0; |
2631 | } | |
2632 | ||
2633 | ||
2634 | ||
cc371e66 AK |
2635 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2636 | struct bio_vec *bvec) | |
1da177e4 LT |
2637 | { |
2638 | struct pktcdvd_device *pd = q->queuedata; | |
cc371e66 AK |
2639 | sector_t zone = ZONE(bmd->bi_sector, pd); |
2640 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; | |
1da177e4 LT |
2641 | int remaining = (pd->settings.size << 9) - used; |
2642 | int remaining2; | |
2643 | ||
2644 | /* | |
2645 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2646 | * boundary, pkt_make_request() will split the bio. | |
2647 | */ | |
cc371e66 | 2648 | remaining2 = PAGE_SIZE - bmd->bi_size; |
1da177e4 LT |
2649 | remaining = max(remaining, remaining2); |
2650 | ||
2651 | BUG_ON(remaining < 0); | |
2652 | return remaining; | |
2653 | } | |
2654 | ||
2655 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2656 | { | |
165125e1 | 2657 | struct request_queue *q = pd->disk->queue; |
1da177e4 LT |
2658 | |
2659 | blk_queue_make_request(q, pkt_make_request); | |
2660 | blk_queue_hardsect_size(q, CD_FRAMESIZE); | |
2661 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); | |
2662 | blk_queue_merge_bvec(q, pkt_merge_bvec); | |
2663 | q->queuedata = pd; | |
2664 | } | |
2665 | ||
2666 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2667 | { | |
2668 | struct pktcdvd_device *pd = m->private; | |
2669 | char *msg; | |
2670 | char bdev_buf[BDEVNAME_SIZE]; | |
2671 | int states[PACKET_NUM_STATES]; | |
2672 | ||
2673 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2674 | bdevname(pd->bdev, bdev_buf)); | |
2675 | ||
2676 | seq_printf(m, "\nSettings:\n"); | |
2677 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2678 | ||
2679 | if (pd->settings.write_type == 0) | |
2680 | msg = "Packet"; | |
2681 | else | |
2682 | msg = "Unknown"; | |
2683 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2684 | ||
2685 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2686 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2687 | ||
2688 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2689 | ||
2690 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2691 | msg = "Mode 1"; | |
2692 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2693 | msg = "Mode 2"; | |
2694 | else | |
2695 | msg = "Unknown"; | |
2696 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2697 | ||
2698 | seq_printf(m, "\nStatistics:\n"); | |
2699 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2700 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2701 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2702 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2703 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2704 | ||
2705 | seq_printf(m, "\nMisc:\n"); | |
2706 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2707 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2708 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2709 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2710 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2711 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2712 | ||
2713 | seq_printf(m, "\nQueue state:\n"); | |
2714 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2715 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2716 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2717 | ||
2718 | pkt_count_states(pd, states); | |
2719 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2720 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2721 | ||
0a0fc960 TM |
2722 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2723 | pd->write_congestion_off, | |
2724 | pd->write_congestion_on); | |
1da177e4 LT |
2725 | return 0; |
2726 | } | |
2727 | ||
2728 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2729 | { | |
2730 | return single_open(file, pkt_seq_show, PDE(inode)->data); | |
2731 | } | |
2732 | ||
2b8693c0 | 2733 | static const struct file_operations pkt_proc_fops = { |
1da177e4 LT |
2734 | .open = pkt_seq_open, |
2735 | .read = seq_read, | |
2736 | .llseek = seq_lseek, | |
2737 | .release = single_release | |
2738 | }; | |
2739 | ||
2740 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2741 | { | |
2742 | int i; | |
2743 | int ret = 0; | |
2744 | char b[BDEVNAME_SIZE]; | |
1da177e4 LT |
2745 | struct block_device *bdev; |
2746 | ||
2747 | if (pd->pkt_dev == dev) { | |
7822082d | 2748 | printk(DRIVER_NAME": Recursive setup not allowed\n"); |
1da177e4 LT |
2749 | return -EBUSY; |
2750 | } | |
2751 | for (i = 0; i < MAX_WRITERS; i++) { | |
2752 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2753 | if (!pd2) | |
2754 | continue; | |
2755 | if (pd2->bdev->bd_dev == dev) { | |
7822082d | 2756 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); |
1da177e4 LT |
2757 | return -EBUSY; |
2758 | } | |
2759 | if (pd2->pkt_dev == dev) { | |
7822082d | 2760 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); |
1da177e4 LT |
2761 | return -EBUSY; |
2762 | } | |
2763 | } | |
2764 | ||
2765 | bdev = bdget(dev); | |
2766 | if (!bdev) | |
2767 | return -ENOMEM; | |
2768 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); | |
2769 | if (ret) | |
2770 | return ret; | |
2771 | ||
2772 | /* This is safe, since we have a reference from open(). */ | |
2773 | __module_get(THIS_MODULE); | |
2774 | ||
1da177e4 LT |
2775 | pd->bdev = bdev; |
2776 | set_blocksize(bdev, CD_FRAMESIZE); | |
2777 | ||
2778 | pkt_init_queue(pd); | |
2779 | ||
2780 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2781 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2782 | if (IS_ERR(pd->cdrw.thread)) { | |
7822082d | 2783 | printk(DRIVER_NAME": can't start kernel thread\n"); |
1da177e4 | 2784 | ret = -ENOMEM; |
e1bc89bc | 2785 | goto out_mem; |
1da177e4 LT |
2786 | } |
2787 | ||
c7705f34 | 2788 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
7822082d | 2789 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
1da177e4 LT |
2790 | return 0; |
2791 | ||
1da177e4 LT |
2792 | out_mem: |
2793 | blkdev_put(bdev); | |
2794 | /* This is safe: open() is still holding a reference. */ | |
2795 | module_put(THIS_MODULE); | |
2796 | return ret; | |
2797 | } | |
2798 | ||
8560c650 | 2799 | static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 2800 | { |
8560c650 | 2801 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; |
1da177e4 LT |
2802 | |
2803 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); | |
1da177e4 LT |
2804 | |
2805 | switch (cmd) { | |
2806 | /* | |
2807 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2808 | */ | |
2809 | case CDROMMULTISESSION: | |
2810 | case CDROMREADTOCENTRY: | |
2811 | case CDROM_LAST_WRITTEN: | |
2812 | case CDROM_SEND_PACKET: | |
2813 | case SCSI_IOCTL_SEND_COMMAND: | |
8560c650 | 2814 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2815 | |
2816 | case CDROMEJECT: | |
2817 | /* | |
2818 | * The door gets locked when the device is opened, so we | |
2819 | * have to unlock it or else the eject command fails. | |
2820 | */ | |
948423e5 PO |
2821 | if (pd->refcnt == 1) |
2822 | pkt_lock_door(pd, 0); | |
8560c650 | 2823 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2824 | |
2825 | default: | |
7822082d | 2826 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); |
8560c650 | 2827 | return -ENOTTY; |
1da177e4 | 2828 | } |
8560c650 LT |
2829 | |
2830 | return 0; | |
1da177e4 LT |
2831 | } |
2832 | ||
2833 | static int pkt_media_changed(struct gendisk *disk) | |
2834 | { | |
2835 | struct pktcdvd_device *pd = disk->private_data; | |
2836 | struct gendisk *attached_disk; | |
2837 | ||
2838 | if (!pd) | |
2839 | return 0; | |
2840 | if (!pd->bdev) | |
2841 | return 0; | |
2842 | attached_disk = pd->bdev->bd_disk; | |
2843 | if (!attached_disk) | |
2844 | return 0; | |
2845 | return attached_disk->fops->media_changed(attached_disk); | |
2846 | } | |
2847 | ||
2848 | static struct block_device_operations pktcdvd_ops = { | |
2849 | .owner = THIS_MODULE, | |
2850 | .open = pkt_open, | |
2851 | .release = pkt_close, | |
8560c650 | 2852 | .ioctl = pkt_ioctl, |
1da177e4 LT |
2853 | .media_changed = pkt_media_changed, |
2854 | }; | |
2855 | ||
2856 | /* | |
2857 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2858 | */ | |
adb9250a | 2859 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2860 | { |
2861 | int idx; | |
2862 | int ret = -ENOMEM; | |
2863 | struct pktcdvd_device *pd; | |
2864 | struct gendisk *disk; | |
adb9250a TM |
2865 | |
2866 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2867 | |
2868 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2869 | if (!pkt_devs[idx]) | |
2870 | break; | |
2871 | if (idx == MAX_WRITERS) { | |
7822082d | 2872 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2873 | ret = -EBUSY; |
2874 | goto out_mutex; | |
1da177e4 LT |
2875 | } |
2876 | ||
1107d2e0 | 2877 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2878 | if (!pd) |
adb9250a | 2879 | goto out_mutex; |
1da177e4 | 2880 | |
0eaae62a MD |
2881 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2882 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2883 | if (!pd->rb_pool) |
2884 | goto out_mem; | |
2885 | ||
e1bc89bc PO |
2886 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2887 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2888 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2889 | ||
1da177e4 LT |
2890 | spin_lock_init(&pd->lock); |
2891 | spin_lock_init(&pd->iosched.lock); | |
7822082d | 2892 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2893 | init_waitqueue_head(&pd->wqueue); |
2894 | pd->bio_queue = RB_ROOT; | |
2895 | ||
0a0fc960 TM |
2896 | pd->write_congestion_on = write_congestion_on; |
2897 | pd->write_congestion_off = write_congestion_off; | |
2898 | ||
adb9250a TM |
2899 | disk = alloc_disk(1); |
2900 | if (!disk) | |
2901 | goto out_mem; | |
2902 | pd->disk = disk; | |
add21660 | 2903 | disk->major = pktdev_major; |
1da177e4 LT |
2904 | disk->first_minor = idx; |
2905 | disk->fops = &pktcdvd_ops; | |
2906 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2907 | strcpy(disk->disk_name, pd->name); |
1da177e4 LT |
2908 | disk->private_data = pd; |
2909 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2910 | if (!disk->queue) | |
2911 | goto out_mem2; | |
2912 | ||
f331c029 | 2913 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2914 | ret = pkt_new_dev(pd, dev); |
2915 | if (ret) | |
2916 | goto out_new_dev; | |
2917 | ||
2918 | add_disk(disk); | |
adb9250a | 2919 | |
32694850 TM |
2920 | pkt_sysfs_dev_new(pd); |
2921 | pkt_debugfs_dev_new(pd); | |
2922 | ||
1da177e4 | 2923 | pkt_devs[idx] = pd; |
adb9250a TM |
2924 | if (pkt_dev) |
2925 | *pkt_dev = pd->pkt_dev; | |
2926 | ||
2927 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2928 | return 0; |
2929 | ||
2930 | out_new_dev: | |
1312f40e | 2931 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2932 | out_mem2: |
2933 | put_disk(disk); | |
2934 | out_mem: | |
2935 | if (pd->rb_pool) | |
2936 | mempool_destroy(pd->rb_pool); | |
2937 | kfree(pd); | |
adb9250a TM |
2938 | out_mutex: |
2939 | mutex_unlock(&ctl_mutex); | |
2940 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); | |
1da177e4 LT |
2941 | return ret; |
2942 | } | |
2943 | ||
2944 | /* | |
2945 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2946 | */ | |
adb9250a | 2947 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2948 | { |
2949 | struct pktcdvd_device *pd; | |
2950 | int idx; | |
adb9250a TM |
2951 | int ret = 0; |
2952 | ||
2953 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2954 | |
2955 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2956 | pd = pkt_devs[idx]; | |
2957 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2958 | break; | |
2959 | } | |
2960 | if (idx == MAX_WRITERS) { | |
7822082d | 2961 | DPRINTK(DRIVER_NAME": dev not setup\n"); |
adb9250a TM |
2962 | ret = -ENXIO; |
2963 | goto out; | |
1da177e4 LT |
2964 | } |
2965 | ||
adb9250a TM |
2966 | if (pd->refcnt > 0) { |
2967 | ret = -EBUSY; | |
2968 | goto out; | |
2969 | } | |
1da177e4 LT |
2970 | if (!IS_ERR(pd->cdrw.thread)) |
2971 | kthread_stop(pd->cdrw.thread); | |
2972 | ||
32694850 TM |
2973 | pkt_devs[idx] = NULL; |
2974 | ||
2975 | pkt_debugfs_dev_remove(pd); | |
2976 | pkt_sysfs_dev_remove(pd); | |
2977 | ||
1da177e4 LT |
2978 | blkdev_put(pd->bdev); |
2979 | ||
1da177e4 | 2980 | remove_proc_entry(pd->name, pkt_proc); |
7822082d | 2981 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); |
1da177e4 LT |
2982 | |
2983 | del_gendisk(pd->disk); | |
1312f40e | 2984 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2985 | put_disk(pd->disk); |
2986 | ||
1da177e4 LT |
2987 | mempool_destroy(pd->rb_pool); |
2988 | kfree(pd); | |
2989 | ||
2990 | /* This is safe: open() is still holding a reference. */ | |
2991 | module_put(THIS_MODULE); | |
adb9250a TM |
2992 | |
2993 | out: | |
2994 | mutex_unlock(&ctl_mutex); | |
2995 | return ret; | |
1da177e4 LT |
2996 | } |
2997 | ||
2998 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2999 | { | |
adb9250a TM |
3000 | struct pktcdvd_device *pd; |
3001 | ||
3002 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3003 | ||
3004 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
3005 | if (pd) { |
3006 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
3007 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
3008 | } else { | |
3009 | ctrl_cmd->dev = 0; | |
3010 | ctrl_cmd->pkt_dev = 0; | |
3011 | } | |
3012 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
3013 | |
3014 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
3015 | } |
3016 | ||
8560c650 | 3017 | static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
3018 | { |
3019 | void __user *argp = (void __user *)arg; | |
3020 | struct pkt_ctrl_command ctrl_cmd; | |
3021 | int ret = 0; | |
adb9250a | 3022 | dev_t pkt_dev = 0; |
1da177e4 LT |
3023 | |
3024 | if (cmd != PACKET_CTRL_CMD) | |
3025 | return -ENOTTY; | |
3026 | ||
3027 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
3028 | return -EFAULT; | |
3029 | ||
3030 | switch (ctrl_cmd.command) { | |
3031 | case PKT_CTRL_CMD_SETUP: | |
3032 | if (!capable(CAP_SYS_ADMIN)) | |
3033 | return -EPERM; | |
adb9250a TM |
3034 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
3035 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
3036 | break; |
3037 | case PKT_CTRL_CMD_TEARDOWN: | |
3038 | if (!capable(CAP_SYS_ADMIN)) | |
3039 | return -EPERM; | |
adb9250a | 3040 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
3041 | break; |
3042 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 3043 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
3044 | break; |
3045 | default: | |
3046 | return -ENOTTY; | |
3047 | } | |
3048 | ||
3049 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
3050 | return -EFAULT; | |
3051 | return ret; | |
3052 | } | |
3053 | ||
3054 | ||
2b8693c0 | 3055 | static const struct file_operations pkt_ctl_fops = { |
8560c650 | 3056 | .ioctl = pkt_ctl_ioctl, |
1da177e4 LT |
3057 | .owner = THIS_MODULE, |
3058 | }; | |
3059 | ||
3060 | static struct miscdevice pkt_misc = { | |
3061 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 3062 | .name = DRIVER_NAME, |
1da177e4 LT |
3063 | .fops = &pkt_ctl_fops |
3064 | }; | |
3065 | ||
3066 | static int __init pkt_init(void) | |
3067 | { | |
3068 | int ret; | |
3069 | ||
32694850 TM |
3070 | mutex_init(&ctl_mutex); |
3071 | ||
0eaae62a MD |
3072 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
3073 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
3074 | if (!psd_pool) |
3075 | return -ENOMEM; | |
3076 | ||
add21660 | 3077 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 3078 | if (ret < 0) { |
7822082d | 3079 | printk(DRIVER_NAME": Unable to register block device\n"); |
1da177e4 LT |
3080 | goto out2; |
3081 | } | |
add21660 TM |
3082 | if (!pktdev_major) |
3083 | pktdev_major = ret; | |
1da177e4 | 3084 | |
32694850 TM |
3085 | ret = pkt_sysfs_init(); |
3086 | if (ret) | |
3087 | goto out; | |
3088 | ||
3089 | pkt_debugfs_init(); | |
3090 | ||
1da177e4 LT |
3091 | ret = misc_register(&pkt_misc); |
3092 | if (ret) { | |
7822082d | 3093 | printk(DRIVER_NAME": Unable to register misc device\n"); |
32694850 | 3094 | goto out_misc; |
1da177e4 LT |
3095 | } |
3096 | ||
928b4d8c | 3097 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3098 | |
1da177e4 LT |
3099 | return 0; |
3100 | ||
32694850 TM |
3101 | out_misc: |
3102 | pkt_debugfs_cleanup(); | |
3103 | pkt_sysfs_cleanup(); | |
1da177e4 | 3104 | out: |
add21660 | 3105 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3106 | out2: |
3107 | mempool_destroy(psd_pool); | |
3108 | return ret; | |
3109 | } | |
3110 | ||
3111 | static void __exit pkt_exit(void) | |
3112 | { | |
928b4d8c | 3113 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3114 | misc_deregister(&pkt_misc); |
32694850 TM |
3115 | |
3116 | pkt_debugfs_cleanup(); | |
3117 | pkt_sysfs_cleanup(); | |
3118 | ||
add21660 | 3119 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3120 | mempool_destroy(psd_pool); |
3121 | } | |
3122 | ||
3123 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3124 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3125 | MODULE_LICENSE("GPL"); | |
3126 | ||
3127 | module_init(pkt_init); | |
3128 | module_exit(pkt_exit); |