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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 | * | |
c62b37d9 | 39 | * At the top layer there is a custom ->submit_bio function that forwards |
a676f8d0 PO |
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 | ||
99481334 JP |
47 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
48 | ||
1da177e4 | 49 | #include <linux/pktcdvd.h> |
1da177e4 LT |
50 | #include <linux/module.h> |
51 | #include <linux/types.h> | |
52 | #include <linux/kernel.h> | |
f80a0ca6 | 53 | #include <linux/compat.h> |
1da177e4 LT |
54 | #include <linux/kthread.h> |
55 | #include <linux/errno.h> | |
56 | #include <linux/spinlock.h> | |
57 | #include <linux/file.h> | |
58 | #include <linux/proc_fs.h> | |
59 | #include <linux/seq_file.h> | |
60 | #include <linux/miscdevice.h> | |
7dfb7103 | 61 | #include <linux/freezer.h> |
1657f824 | 62 | #include <linux/mutex.h> |
5a0e3ad6 | 63 | #include <linux/slab.h> |
66114cad | 64 | #include <linux/backing-dev.h> |
1da177e4 LT |
65 | #include <scsi/scsi_cmnd.h> |
66 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 67 | #include <scsi/scsi.h> |
32694850 TM |
68 | #include <linux/debugfs.h> |
69 | #include <linux/device.h> | |
55690c07 | 70 | #include <linux/nospec.h> |
7c0f6ba6 | 71 | #include <linux/uaccess.h> |
1da177e4 | 72 | |
7822082d TM |
73 | #define DRIVER_NAME "pktcdvd" |
74 | ||
fa63c0ab JP |
75 | #define pkt_err(pd, fmt, ...) \ |
76 | pr_err("%s: " fmt, pd->name, ##__VA_ARGS__) | |
ca73dabc JP |
77 | #define pkt_notice(pd, fmt, ...) \ |
78 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__) | |
0c075d64 JP |
79 | #define pkt_info(pd, fmt, ...) \ |
80 | pr_info("%s: " fmt, pd->name, ##__VA_ARGS__) | |
fa63c0ab | 81 | |
844aa797 JP |
82 | #define pkt_dbg(level, pd, fmt, ...) \ |
83 | do { \ | |
84 | if (level == 2 && PACKET_DEBUG >= 2) \ | |
85 | pr_notice("%s: %s():" fmt, \ | |
86 | pd->name, __func__, ##__VA_ARGS__); \ | |
87 | else if (level == 1 && PACKET_DEBUG >= 1) \ | |
88 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \ | |
cd3f2cd0 | 89 | } while (0) |
1da177e4 LT |
90 | |
91 | #define MAX_SPEED 0xffff | |
92 | ||
2a48fc0a | 93 | static DEFINE_MUTEX(pktcdvd_mutex); |
1da177e4 LT |
94 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
95 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 96 | static int pktdev_major; |
0a0fc960 TM |
97 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
98 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 99 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
64c4bc4d KO |
100 | static mempool_t psd_pool; |
101 | static struct bio_set pkt_bio_set; | |
1da177e4 | 102 | |
32694850 | 103 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
ea5ffff5 | 104 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
32694850 TM |
105 | |
106 | /* forward declaration */ | |
107 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
108 | static int pkt_remove_dev(dev_t pkt_dev); | |
109 | static int pkt_seq_show(struct seq_file *m, void *p); | |
110 | ||
5323fb77 JP |
111 | static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd) |
112 | { | |
113 | return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1); | |
114 | } | |
32694850 TM |
115 | |
116 | /* | |
117 | * create and register a pktcdvd kernel object. | |
118 | */ | |
119 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
120 | const char* name, | |
121 | struct kobject* parent, | |
122 | struct kobj_type* ktype) | |
123 | { | |
124 | struct pktcdvd_kobj *p; | |
89c42606 GKH |
125 | int error; |
126 | ||
32694850 TM |
127 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
128 | if (!p) | |
129 | return NULL; | |
32694850 | 130 | p->pd = pd; |
89c42606 GKH |
131 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
132 | if (error) { | |
d17a18dd | 133 | kobject_put(&p->kobj); |
32694850 | 134 | return NULL; |
d17a18dd | 135 | } |
89c42606 | 136 | kobject_uevent(&p->kobj, KOBJ_ADD); |
32694850 TM |
137 | return p; |
138 | } | |
139 | /* | |
140 | * remove a pktcdvd kernel object. | |
141 | */ | |
142 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
143 | { | |
144 | if (p) | |
c10997f6 | 145 | kobject_put(&p->kobj); |
32694850 TM |
146 | } |
147 | /* | |
148 | * default release function for pktcdvd kernel objects. | |
149 | */ | |
150 | static void pkt_kobj_release(struct kobject *kobj) | |
151 | { | |
152 | kfree(to_pktcdvdkobj(kobj)); | |
153 | } | |
154 | ||
155 | ||
156 | /********************************************************** | |
157 | * | |
158 | * sysfs interface for pktcdvd | |
159 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
160 | * | |
161 | **********************************************************/ | |
162 | ||
163 | #define DEF_ATTR(_obj,_name,_mode) \ | |
7b595756 | 164 | static struct attribute _obj = { .name = _name, .mode = _mode } |
32694850 TM |
165 | |
166 | /********************************************************** | |
167 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
168 | stat/reset | |
169 | stat/packets_started | |
170 | stat/packets_finished | |
171 | stat/kb_written | |
172 | stat/kb_read | |
173 | stat/kb_read_gather | |
174 | write_queue/size | |
175 | write_queue/congestion_off | |
176 | write_queue/congestion_on | |
177 | **********************************************************/ | |
178 | ||
179 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
180 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
181 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
182 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
183 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
184 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
185 | ||
186 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
187 | &kobj_pkt_attr_st1, | |
188 | &kobj_pkt_attr_st2, | |
189 | &kobj_pkt_attr_st3, | |
190 | &kobj_pkt_attr_st4, | |
191 | &kobj_pkt_attr_st5, | |
192 | &kobj_pkt_attr_st6, | |
193 | NULL | |
194 | }; | |
195 | ||
196 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
197 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
198 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
199 | ||
200 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
201 | &kobj_pkt_attr_wq1, | |
202 | &kobj_pkt_attr_wq2, | |
203 | &kobj_pkt_attr_wq3, | |
204 | NULL | |
205 | }; | |
206 | ||
32694850 TM |
207 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
208 | struct attribute *attr, char *data) | |
209 | { | |
210 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
211 | int n = 0; | |
212 | int v; | |
213 | if (strcmp(attr->name, "packets_started") == 0) { | |
214 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
215 | ||
216 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
217 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
218 | ||
219 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
220 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
221 | ||
222 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
223 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
224 | ||
225 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
226 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
227 | ||
228 | } else if (strcmp(attr->name, "size") == 0) { | |
229 | spin_lock(&pd->lock); | |
230 | v = pd->bio_queue_size; | |
231 | spin_unlock(&pd->lock); | |
232 | n = sprintf(data, "%d\n", v); | |
233 | ||
234 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
235 | spin_lock(&pd->lock); | |
236 | v = pd->write_congestion_off; | |
237 | spin_unlock(&pd->lock); | |
238 | n = sprintf(data, "%d\n", v); | |
239 | ||
240 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
241 | spin_lock(&pd->lock); | |
242 | v = pd->write_congestion_on; | |
243 | spin_unlock(&pd->lock); | |
244 | n = sprintf(data, "%d\n", v); | |
245 | } | |
246 | return n; | |
247 | } | |
248 | ||
249 | static void init_write_congestion_marks(int* lo, int* hi) | |
250 | { | |
251 | if (*hi > 0) { | |
252 | *hi = max(*hi, 500); | |
253 | *hi = min(*hi, 1000000); | |
254 | if (*lo <= 0) | |
255 | *lo = *hi - 100; | |
256 | else { | |
257 | *lo = min(*lo, *hi - 100); | |
258 | *lo = max(*lo, 100); | |
259 | } | |
260 | } else { | |
261 | *hi = -1; | |
262 | *lo = -1; | |
263 | } | |
264 | } | |
265 | ||
266 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
267 | struct attribute *attr, | |
268 | const char *data, size_t len) | |
269 | { | |
270 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
271 | int val; | |
32694850 | 272 | |
83f3aa3d | 273 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
32694850 TM |
274 | pd->stats.pkt_started = 0; |
275 | pd->stats.pkt_ended = 0; | |
276 | pd->stats.secs_w = 0; | |
277 | pd->stats.secs_rg = 0; | |
278 | pd->stats.secs_r = 0; | |
279 | ||
280 | } else if (strcmp(attr->name, "congestion_off") == 0 | |
83f3aa3d | 281 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
282 | spin_lock(&pd->lock); |
283 | pd->write_congestion_off = val; | |
284 | init_write_congestion_marks(&pd->write_congestion_off, | |
285 | &pd->write_congestion_on); | |
286 | spin_unlock(&pd->lock); | |
287 | ||
288 | } else if (strcmp(attr->name, "congestion_on") == 0 | |
83f3aa3d | 289 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
290 | spin_lock(&pd->lock); |
291 | pd->write_congestion_on = val; | |
292 | init_write_congestion_marks(&pd->write_congestion_off, | |
293 | &pd->write_congestion_on); | |
294 | spin_unlock(&pd->lock); | |
295 | } | |
296 | return len; | |
297 | } | |
298 | ||
52cf25d0 | 299 | static const struct sysfs_ops kobj_pkt_ops = { |
32694850 TM |
300 | .show = kobj_pkt_show, |
301 | .store = kobj_pkt_store | |
302 | }; | |
303 | static struct kobj_type kobj_pkt_type_stat = { | |
304 | .release = pkt_kobj_release, | |
305 | .sysfs_ops = &kobj_pkt_ops, | |
306 | .default_attrs = kobj_pkt_attrs_stat | |
307 | }; | |
308 | static struct kobj_type kobj_pkt_type_wqueue = { | |
309 | .release = pkt_kobj_release, | |
310 | .sysfs_ops = &kobj_pkt_ops, | |
311 | .default_attrs = kobj_pkt_attrs_wqueue | |
312 | }; | |
313 | ||
314 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
315 | { | |
316 | if (class_pktcdvd) { | |
cba76717 | 317 | pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
1ff9f542 | 318 | "%s", pd->name); |
6013c12b TJ |
319 | if (IS_ERR(pd->dev)) |
320 | pd->dev = NULL; | |
32694850 | 321 | } |
6013c12b | 322 | if (pd->dev) { |
32694850 | 323 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
6013c12b | 324 | &pd->dev->kobj, |
32694850 TM |
325 | &kobj_pkt_type_stat); |
326 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
6013c12b | 327 | &pd->dev->kobj, |
32694850 TM |
328 | &kobj_pkt_type_wqueue); |
329 | } | |
330 | } | |
331 | ||
332 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
333 | { | |
334 | pkt_kobj_remove(pd->kobj_stat); | |
335 | pkt_kobj_remove(pd->kobj_wqueue); | |
336 | if (class_pktcdvd) | |
ca0bf64d | 337 | device_unregister(pd->dev); |
32694850 TM |
338 | } |
339 | ||
340 | ||
341 | /******************************************************************** | |
342 | /sys/class/pktcdvd/ | |
343 | add map block device | |
344 | remove unmap packet dev | |
345 | device_map show mappings | |
346 | *******************************************************************/ | |
347 | ||
348 | static void class_pktcdvd_release(struct class *cls) | |
349 | { | |
350 | kfree(cls); | |
351 | } | |
dc307f92 GKH |
352 | |
353 | static ssize_t device_map_show(struct class *c, struct class_attribute *attr, | |
354 | char *data) | |
32694850 TM |
355 | { |
356 | int n = 0; | |
357 | int idx; | |
358 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
359 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
360 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
361 | if (!pd) | |
362 | continue; | |
363 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
364 | pd->name, | |
365 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
366 | MAJOR(pd->bdev->bd_dev), | |
367 | MINOR(pd->bdev->bd_dev)); | |
368 | } | |
369 | mutex_unlock(&ctl_mutex); | |
370 | return n; | |
371 | } | |
dc307f92 | 372 | static CLASS_ATTR_RO(device_map); |
32694850 | 373 | |
dc307f92 GKH |
374 | static ssize_t add_store(struct class *c, struct class_attribute *attr, |
375 | const char *buf, size_t count) | |
32694850 TM |
376 | { |
377 | unsigned int major, minor; | |
fffe487d | 378 | |
83f3aa3d | 379 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
fffe487d TH |
380 | /* pkt_setup_dev() expects caller to hold reference to self */ |
381 | if (!try_module_get(THIS_MODULE)) | |
382 | return -ENODEV; | |
383 | ||
32694850 | 384 | pkt_setup_dev(MKDEV(major, minor), NULL); |
fffe487d TH |
385 | |
386 | module_put(THIS_MODULE); | |
387 | ||
32694850 TM |
388 | return count; |
389 | } | |
fffe487d | 390 | |
32694850 TM |
391 | return -EINVAL; |
392 | } | |
dc307f92 | 393 | static CLASS_ATTR_WO(add); |
32694850 | 394 | |
dc307f92 GKH |
395 | static ssize_t remove_store(struct class *c, struct class_attribute *attr, |
396 | const char *buf, size_t count) | |
32694850 TM |
397 | { |
398 | unsigned int major, minor; | |
83f3aa3d | 399 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
32694850 TM |
400 | pkt_remove_dev(MKDEV(major, minor)); |
401 | return count; | |
402 | } | |
403 | return -EINVAL; | |
404 | } | |
dc307f92 | 405 | static CLASS_ATTR_WO(remove); |
32694850 | 406 | |
dc307f92 GKH |
407 | static struct attribute *class_pktcdvd_attrs[] = { |
408 | &class_attr_add.attr, | |
409 | &class_attr_remove.attr, | |
410 | &class_attr_device_map.attr, | |
411 | NULL, | |
32694850 | 412 | }; |
dc307f92 | 413 | ATTRIBUTE_GROUPS(class_pktcdvd); |
32694850 TM |
414 | |
415 | static int pkt_sysfs_init(void) | |
416 | { | |
417 | int ret = 0; | |
418 | ||
419 | /* | |
420 | * create control files in sysfs | |
421 | * /sys/class/pktcdvd/... | |
422 | */ | |
423 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
424 | if (!class_pktcdvd) | |
425 | return -ENOMEM; | |
426 | class_pktcdvd->name = DRIVER_NAME; | |
427 | class_pktcdvd->owner = THIS_MODULE; | |
428 | class_pktcdvd->class_release = class_pktcdvd_release; | |
dc307f92 | 429 | class_pktcdvd->class_groups = class_pktcdvd_groups; |
32694850 TM |
430 | ret = class_register(class_pktcdvd); |
431 | if (ret) { | |
432 | kfree(class_pktcdvd); | |
433 | class_pktcdvd = NULL; | |
99481334 | 434 | pr_err("failed to create class pktcdvd\n"); |
32694850 TM |
435 | return ret; |
436 | } | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static void pkt_sysfs_cleanup(void) | |
441 | { | |
442 | if (class_pktcdvd) | |
443 | class_destroy(class_pktcdvd); | |
444 | class_pktcdvd = NULL; | |
445 | } | |
446 | ||
447 | /******************************************************************** | |
448 | entries in debugfs | |
449 | ||
156f5a78 | 450 | /sys/kernel/debug/pktcdvd[0-7]/ |
32694850 TM |
451 | info |
452 | ||
453 | *******************************************************************/ | |
454 | ||
455 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
456 | { | |
457 | return pkt_seq_show(m, p); | |
458 | } | |
459 | ||
460 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
461 | { | |
462 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
463 | } | |
464 | ||
2b8693c0 | 465 | static const struct file_operations debug_fops = { |
32694850 TM |
466 | .open = pkt_debugfs_fops_open, |
467 | .read = seq_read, | |
468 | .llseek = seq_lseek, | |
469 | .release = single_release, | |
470 | .owner = THIS_MODULE, | |
471 | }; | |
472 | ||
473 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
474 | { | |
475 | if (!pkt_debugfs_root) | |
476 | return; | |
32694850 | 477 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); |
49c2856a | 478 | if (!pd->dfs_d_root) |
32694850 | 479 | return; |
49c2856a | 480 | |
5657a819 JP |
481 | pd->dfs_f_info = debugfs_create_file("info", 0444, |
482 | pd->dfs_d_root, pd, &debug_fops); | |
32694850 TM |
483 | } |
484 | ||
485 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
486 | { | |
487 | if (!pkt_debugfs_root) | |
488 | return; | |
49c2856a DC |
489 | debugfs_remove(pd->dfs_f_info); |
490 | debugfs_remove(pd->dfs_d_root); | |
32694850 | 491 | pd->dfs_f_info = NULL; |
32694850 TM |
492 | pd->dfs_d_root = NULL; |
493 | } | |
494 | ||
495 | static void pkt_debugfs_init(void) | |
496 | { | |
497 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
32694850 TM |
498 | } |
499 | ||
500 | static void pkt_debugfs_cleanup(void) | |
501 | { | |
32694850 TM |
502 | debugfs_remove(pkt_debugfs_root); |
503 | pkt_debugfs_root = NULL; | |
504 | } | |
505 | ||
506 | /* ----------------------------------------------------------*/ | |
507 | ||
1da177e4 LT |
508 | |
509 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
510 | { | |
511 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
512 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
844aa797 | 513 | pkt_dbg(2, pd, "queue empty\n"); |
1da177e4 LT |
514 | atomic_set(&pd->iosched.attention, 1); |
515 | wake_up(&pd->wqueue); | |
516 | } | |
517 | } | |
518 | ||
1da177e4 LT |
519 | /* |
520 | * Allocate a packet_data struct | |
521 | */ | |
e1bc89bc | 522 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
523 | { |
524 | int i; | |
525 | struct packet_data *pkt; | |
526 | ||
1107d2e0 | 527 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
528 | if (!pkt) |
529 | goto no_pkt; | |
1da177e4 | 530 | |
e1bc89bc | 531 | pkt->frames = frames; |
ccc5c9ca | 532 | pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames); |
1da177e4 LT |
533 | if (!pkt->w_bio) |
534 | goto no_bio; | |
535 | ||
e1bc89bc | 536 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
537 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
538 | if (!pkt->pages[i]) | |
539 | goto no_page; | |
540 | } | |
541 | ||
542 | spin_lock_init(&pkt->lock); | |
c5ecc484 | 543 | bio_list_init(&pkt->orig_bios); |
1da177e4 | 544 | |
e1bc89bc | 545 | for (i = 0; i < frames; i++) { |
ccc5c9ca | 546 | struct bio *bio = bio_kmalloc(GFP_KERNEL, 1); |
1da177e4 LT |
547 | if (!bio) |
548 | goto no_rd_bio; | |
ccc5c9ca | 549 | |
1da177e4 LT |
550 | pkt->r_bios[i] = bio; |
551 | } | |
552 | ||
553 | return pkt; | |
554 | ||
555 | no_rd_bio: | |
e1bc89bc | 556 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
557 | struct bio *bio = pkt->r_bios[i]; |
558 | if (bio) | |
559 | bio_put(bio); | |
560 | } | |
561 | ||
562 | no_page: | |
e1bc89bc | 563 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
564 | if (pkt->pages[i]) |
565 | __free_page(pkt->pages[i]); | |
566 | bio_put(pkt->w_bio); | |
567 | no_bio: | |
568 | kfree(pkt); | |
569 | no_pkt: | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | /* | |
574 | * Free a packet_data struct | |
575 | */ | |
576 | static void pkt_free_packet_data(struct packet_data *pkt) | |
577 | { | |
578 | int i; | |
579 | ||
e1bc89bc | 580 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
581 | struct bio *bio = pkt->r_bios[i]; |
582 | if (bio) | |
583 | bio_put(bio); | |
584 | } | |
e1bc89bc | 585 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
586 | __free_page(pkt->pages[i]); |
587 | bio_put(pkt->w_bio); | |
588 | kfree(pkt); | |
589 | } | |
590 | ||
591 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
592 | { | |
593 | struct packet_data *pkt, *next; | |
594 | ||
595 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
596 | ||
597 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
598 | pkt_free_packet_data(pkt); | |
599 | } | |
e1bc89bc | 600 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
601 | } |
602 | ||
603 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
604 | { | |
605 | struct packet_data *pkt; | |
606 | ||
e1bc89bc PO |
607 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
608 | ||
1da177e4 | 609 | while (nr_packets > 0) { |
e1bc89bc | 610 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
611 | if (!pkt) { |
612 | pkt_shrink_pktlist(pd); | |
613 | return 0; | |
614 | } | |
615 | pkt->id = nr_packets; | |
616 | pkt->pd = pd; | |
617 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
618 | nr_packets--; | |
619 | } | |
620 | return 1; | |
621 | } | |
622 | ||
1da177e4 LT |
623 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
624 | { | |
625 | struct rb_node *n = rb_next(&node->rb_node); | |
626 | if (!n) | |
627 | return NULL; | |
628 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
629 | } | |
630 | ||
ac893963 | 631 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
632 | { |
633 | rb_erase(&node->rb_node, &pd->bio_queue); | |
64c4bc4d | 634 | mempool_free(node, &pd->rb_pool); |
1da177e4 LT |
635 | pd->bio_queue_size--; |
636 | BUG_ON(pd->bio_queue_size < 0); | |
637 | } | |
638 | ||
639 | /* | |
640 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
641 | */ | |
642 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
643 | { | |
644 | struct rb_node *n = pd->bio_queue.rb_node; | |
645 | struct rb_node *next; | |
646 | struct pkt_rb_node *tmp; | |
647 | ||
648 | if (!n) { | |
649 | BUG_ON(pd->bio_queue_size > 0); | |
650 | return NULL; | |
651 | } | |
652 | ||
653 | for (;;) { | |
654 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
4f024f37 | 655 | if (s <= tmp->bio->bi_iter.bi_sector) |
1da177e4 LT |
656 | next = n->rb_left; |
657 | else | |
658 | next = n->rb_right; | |
659 | if (!next) | |
660 | break; | |
661 | n = next; | |
662 | } | |
663 | ||
4f024f37 | 664 | if (s > tmp->bio->bi_iter.bi_sector) { |
1da177e4 LT |
665 | tmp = pkt_rbtree_next(tmp); |
666 | if (!tmp) | |
667 | return NULL; | |
668 | } | |
4f024f37 | 669 | BUG_ON(s > tmp->bio->bi_iter.bi_sector); |
1da177e4 LT |
670 | return tmp; |
671 | } | |
672 | ||
673 | /* | |
674 | * Insert a node into the pd->bio_queue rb tree. | |
675 | */ | |
676 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
677 | { | |
678 | struct rb_node **p = &pd->bio_queue.rb_node; | |
679 | struct rb_node *parent = NULL; | |
4f024f37 | 680 | sector_t s = node->bio->bi_iter.bi_sector; |
1da177e4 LT |
681 | struct pkt_rb_node *tmp; |
682 | ||
683 | while (*p) { | |
684 | parent = *p; | |
685 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
4f024f37 | 686 | if (s < tmp->bio->bi_iter.bi_sector) |
1da177e4 LT |
687 | p = &(*p)->rb_left; |
688 | else | |
689 | p = &(*p)->rb_right; | |
690 | } | |
691 | rb_link_node(&node->rb_node, parent, p); | |
692 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
693 | pd->bio_queue_size++; | |
694 | } | |
695 | ||
1da177e4 LT |
696 | /* |
697 | * Send a packet_command to the underlying block device and | |
698 | * wait for completion. | |
699 | */ | |
700 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
701 | { | |
165125e1 | 702 | struct request_queue *q = bdev_get_queue(pd->bdev); |
1da177e4 | 703 | struct request *rq; |
406c9b60 CH |
704 | int ret = 0; |
705 | ||
68ec3b81 | 706 | rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? |
da6269da | 707 | REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); |
a492f075 JL |
708 | if (IS_ERR(rq)) |
709 | return PTR_ERR(rq); | |
406c9b60 CH |
710 | |
711 | if (cgc->buflen) { | |
8586ea96 | 712 | ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, |
0eb0b63c | 713 | GFP_NOIO); |
8586ea96 | 714 | if (ret) |
406c9b60 CH |
715 | goto out; |
716 | } | |
1da177e4 | 717 | |
82ed4db4 CH |
718 | scsi_req(rq)->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
719 | memcpy(scsi_req(rq)->cmd, cgc->cmd, CDROM_PACKET_SIZE); | |
1da177e4 | 720 | |
1da177e4 | 721 | rq->timeout = 60*HZ; |
1da177e4 | 722 | if (cgc->quiet) |
e8064021 | 723 | rq->rq_flags |= RQF_QUIET; |
1da177e4 | 724 | |
684da762 | 725 | blk_execute_rq(pd->bdev->bd_disk, rq, 0); |
17d5363b | 726 | if (scsi_req(rq)->result) |
cbc31a47 | 727 | ret = -EIO; |
406c9b60 | 728 | out: |
0bf6d96c | 729 | blk_mq_free_request(rq); |
406c9b60 | 730 | return ret; |
1da177e4 LT |
731 | } |
732 | ||
99481334 JP |
733 | static const char *sense_key_string(__u8 index) |
734 | { | |
735 | static const char * const info[] = { | |
736 | "No sense", "Recovered error", "Not ready", | |
737 | "Medium error", "Hardware error", "Illegal request", | |
738 | "Unit attention", "Data protect", "Blank check", | |
739 | }; | |
740 | ||
741 | return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; | |
742 | } | |
743 | ||
1da177e4 LT |
744 | /* |
745 | * A generic sense dump / resolve mechanism should be implemented across | |
746 | * all ATAPI + SCSI devices. | |
747 | */ | |
f3ded788 JP |
748 | static void pkt_dump_sense(struct pktcdvd_device *pd, |
749 | struct packet_command *cgc) | |
1da177e4 | 750 | { |
e7d0748d | 751 | struct scsi_sense_hdr *sshdr = cgc->sshdr; |
1da177e4 | 752 | |
e7d0748d | 753 | if (sshdr) |
f3ded788 JP |
754 | pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n", |
755 | CDROM_PACKET_SIZE, cgc->cmd, | |
e7d0748d KC |
756 | sshdr->sense_key, sshdr->asc, sshdr->ascq, |
757 | sense_key_string(sshdr->sense_key)); | |
99481334 | 758 | else |
f3ded788 | 759 | pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd); |
1da177e4 LT |
760 | } |
761 | ||
762 | /* | |
763 | * flush the drive cache to media | |
764 | */ | |
765 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
766 | { | |
767 | struct packet_command cgc; | |
768 | ||
769 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
770 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
771 | cgc.quiet = 1; | |
772 | ||
773 | /* | |
774 | * the IMMED bit -- we default to not setting it, although that | |
775 | * would allow a much faster close, this is safer | |
776 | */ | |
777 | #if 0 | |
778 | cgc.cmd[1] = 1 << 1; | |
779 | #endif | |
780 | return pkt_generic_packet(pd, &cgc); | |
781 | } | |
782 | ||
783 | /* | |
784 | * speed is given as the normal factor, e.g. 4 for 4x | |
785 | */ | |
05680d86 PO |
786 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
787 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
788 | { |
789 | struct packet_command cgc; | |
e7d0748d | 790 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
791 | int ret; |
792 | ||
793 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
e7d0748d | 794 | cgc.sshdr = &sshdr; |
1da177e4 LT |
795 | cgc.cmd[0] = GPCMD_SET_SPEED; |
796 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
797 | cgc.cmd[3] = read_speed & 0xff; | |
798 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
799 | cgc.cmd[5] = write_speed & 0xff; | |
800 | ||
ada94973 RH |
801 | ret = pkt_generic_packet(pd, &cgc); |
802 | if (ret) | |
f3ded788 | 803 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
804 | |
805 | return ret; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Queue a bio for processing by the low-level CD device. Must be called | |
810 | * from process context. | |
811 | */ | |
46c271be | 812 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
813 | { |
814 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
815 | if (bio_data_dir(bio) == READ) |
816 | bio_list_add(&pd->iosched.read_queue, bio); | |
817 | else | |
818 | bio_list_add(&pd->iosched.write_queue, bio); | |
1da177e4 LT |
819 | spin_unlock(&pd->iosched.lock); |
820 | ||
821 | atomic_set(&pd->iosched.attention, 1); | |
822 | wake_up(&pd->wqueue); | |
823 | } | |
824 | ||
825 | /* | |
826 | * Process the queued read/write requests. This function handles special | |
827 | * requirements for CDRW drives: | |
828 | * - A cache flush command must be inserted before a read request if the | |
829 | * previous request was a write. | |
46c271be | 830 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 831 | * than necessary. |
46c271be PO |
832 | * - Optimize for throughput at the expense of latency. This means that streaming |
833 | * writes will never be interrupted by a read, but if the drive has to seek | |
834 | * before the next write, switch to reading instead if there are any pending | |
835 | * read requests. | |
1da177e4 LT |
836 | * - Set the read speed according to current usage pattern. When only reading |
837 | * from the device, it's best to use the highest possible read speed, but | |
838 | * when switching often between reading and writing, it's better to have the | |
839 | * same read and write speeds. | |
1da177e4 LT |
840 | */ |
841 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
842 | { | |
1da177e4 LT |
843 | |
844 | if (atomic_read(&pd->iosched.attention) == 0) | |
845 | return; | |
846 | atomic_set(&pd->iosched.attention, 0); | |
847 | ||
1da177e4 LT |
848 | for (;;) { |
849 | struct bio *bio; | |
46c271be | 850 | int reads_queued, writes_queued; |
1da177e4 LT |
851 | |
852 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
853 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
854 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
1da177e4 LT |
855 | spin_unlock(&pd->iosched.lock); |
856 | ||
857 | if (!reads_queued && !writes_queued) | |
858 | break; | |
859 | ||
860 | if (pd->iosched.writing) { | |
46c271be PO |
861 | int need_write_seek = 1; |
862 | spin_lock(&pd->iosched.lock); | |
c5ecc484 | 863 | bio = bio_list_peek(&pd->iosched.write_queue); |
46c271be | 864 | spin_unlock(&pd->iosched.lock); |
4f024f37 KO |
865 | if (bio && (bio->bi_iter.bi_sector == |
866 | pd->iosched.last_write)) | |
46c271be PO |
867 | need_write_seek = 0; |
868 | if (need_write_seek && reads_queued) { | |
1da177e4 | 869 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
844aa797 | 870 | pkt_dbg(2, pd, "write, waiting\n"); |
1da177e4 LT |
871 | break; |
872 | } | |
873 | pkt_flush_cache(pd); | |
874 | pd->iosched.writing = 0; | |
875 | } | |
876 | } else { | |
877 | if (!reads_queued && writes_queued) { | |
878 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
844aa797 | 879 | pkt_dbg(2, pd, "read, waiting\n"); |
1da177e4 LT |
880 | break; |
881 | } | |
882 | pd->iosched.writing = 1; | |
883 | } | |
884 | } | |
885 | ||
886 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
887 | if (pd->iosched.writing) |
888 | bio = bio_list_pop(&pd->iosched.write_queue); | |
889 | else | |
890 | bio = bio_list_pop(&pd->iosched.read_queue); | |
1da177e4 LT |
891 | spin_unlock(&pd->iosched.lock); |
892 | ||
893 | if (!bio) | |
894 | continue; | |
895 | ||
896 | if (bio_data_dir(bio) == READ) | |
4f024f37 KO |
897 | pd->iosched.successive_reads += |
898 | bio->bi_iter.bi_size >> 10; | |
46c271be | 899 | else { |
1da177e4 | 900 | pd->iosched.successive_reads = 0; |
f73a1c7d | 901 | pd->iosched.last_write = bio_end_sector(bio); |
46c271be | 902 | } |
1da177e4 LT |
903 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
904 | if (pd->read_speed == pd->write_speed) { | |
905 | pd->read_speed = MAX_SPEED; | |
906 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
907 | } | |
908 | } else { | |
909 | if (pd->read_speed != pd->write_speed) { | |
910 | pd->read_speed = pd->write_speed; | |
911 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
912 | } | |
913 | } | |
914 | ||
915 | atomic_inc(&pd->cdrw.pending_bios); | |
ed00aabd | 916 | submit_bio_noacct(bio); |
1da177e4 LT |
917 | } |
918 | } | |
919 | ||
920 | /* | |
921 | * Special care is needed if the underlying block device has a small | |
922 | * max_phys_segments value. | |
923 | */ | |
165125e1 | 924 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 | 925 | { |
ae03bf63 | 926 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
8a78362c | 927 | <= queue_max_segments(q)) { |
1da177e4 LT |
928 | /* |
929 | * The cdrom device can handle one segment/frame | |
930 | */ | |
931 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
932 | return 0; | |
ae03bf63 | 933 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
8a78362c | 934 | <= queue_max_segments(q)) { |
1da177e4 LT |
935 | /* |
936 | * We can handle this case at the expense of some extra memory | |
937 | * copies during write operations | |
938 | */ | |
939 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
940 | return 0; | |
941 | } else { | |
fa63c0ab | 942 | pkt_err(pd, "cdrom max_phys_segments too small\n"); |
1da177e4 LT |
943 | return -EIO; |
944 | } | |
945 | } | |
946 | ||
4246a0b6 | 947 | static void pkt_end_io_read(struct bio *bio) |
1da177e4 LT |
948 | { |
949 | struct packet_data *pkt = bio->bi_private; | |
950 | struct pktcdvd_device *pd = pkt->pd; | |
951 | BUG_ON(!pd); | |
952 | ||
844aa797 | 953 | pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n", |
cd3f2cd0 | 954 | bio, (unsigned long long)pkt->sector, |
4e4cbee9 | 955 | (unsigned long long)bio->bi_iter.bi_sector, bio->bi_status); |
1da177e4 | 956 | |
4e4cbee9 | 957 | if (bio->bi_status) |
1da177e4 LT |
958 | atomic_inc(&pkt->io_errors); |
959 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
960 | atomic_inc(&pkt->run_sm); | |
961 | wake_up(&pd->wqueue); | |
962 | } | |
963 | pkt_bio_finished(pd); | |
1da177e4 LT |
964 | } |
965 | ||
4246a0b6 | 966 | static void pkt_end_io_packet_write(struct bio *bio) |
1da177e4 LT |
967 | { |
968 | struct packet_data *pkt = bio->bi_private; | |
969 | struct pktcdvd_device *pd = pkt->pd; | |
970 | BUG_ON(!pd); | |
971 | ||
4e4cbee9 | 972 | pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_status); |
1da177e4 LT |
973 | |
974 | pd->stats.pkt_ended++; | |
975 | ||
976 | pkt_bio_finished(pd); | |
977 | atomic_dec(&pkt->io_wait); | |
978 | atomic_inc(&pkt->run_sm); | |
979 | wake_up(&pd->wqueue); | |
1da177e4 LT |
980 | } |
981 | ||
982 | /* | |
983 | * Schedule reads for the holes in a packet | |
984 | */ | |
985 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
986 | { | |
987 | int frames_read = 0; | |
988 | struct bio *bio; | |
989 | int f; | |
990 | char written[PACKET_MAX_SIZE]; | |
991 | ||
c5ecc484 | 992 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1da177e4 LT |
993 | |
994 | atomic_set(&pkt->io_wait, 0); | |
995 | atomic_set(&pkt->io_errors, 0); | |
996 | ||
1da177e4 LT |
997 | /* |
998 | * Figure out which frames we need to read before we can write. | |
999 | */ | |
1000 | memset(written, 0, sizeof(written)); | |
1001 | spin_lock(&pkt->lock); | |
c5ecc484 | 1002 | bio_list_for_each(bio, &pkt->orig_bios) { |
4f024f37 KO |
1003 | int first_frame = (bio->bi_iter.bi_sector - pkt->sector) / |
1004 | (CD_FRAMESIZE >> 9); | |
1005 | int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1006 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1007 | BUG_ON(first_frame < 0); |
1008 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1009 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1010 | written[f] = 1; | |
1011 | } | |
1012 | spin_unlock(&pkt->lock); | |
1013 | ||
06e7ab53 | 1014 | if (pkt->cache_valid) { |
844aa797 | 1015 | pkt_dbg(2, pd, "zone %llx cached\n", |
06e7ab53 PO |
1016 | (unsigned long long)pkt->sector); |
1017 | goto out_account; | |
1018 | } | |
1019 | ||
1da177e4 LT |
1020 | /* |
1021 | * Schedule reads for missing parts of the packet. | |
1022 | */ | |
1023 | for (f = 0; f < pkt->frames; f++) { | |
1024 | int p, offset; | |
ccc5c9ca | 1025 | |
1da177e4 LT |
1026 | if (written[f]) |
1027 | continue; | |
ccc5c9ca | 1028 | |
1da177e4 | 1029 | bio = pkt->r_bios[f]; |
ccc5c9ca | 1030 | bio_reset(bio); |
4f024f37 | 1031 | bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
74d46992 | 1032 | bio_set_dev(bio, pd->bdev); |
1da177e4 LT |
1033 | bio->bi_end_io = pkt_end_io_read; |
1034 | bio->bi_private = pkt; | |
1035 | ||
1036 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1037 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
844aa797 | 1038 | pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n", |
1da177e4 LT |
1039 | f, pkt->pages[p], offset); |
1040 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1041 | BUG(); | |
1042 | ||
1043 | atomic_inc(&pkt->io_wait); | |
95fe6c1a | 1044 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
46c271be | 1045 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1046 | frames_read++; |
1047 | } | |
1048 | ||
1049 | out_account: | |
844aa797 | 1050 | pkt_dbg(2, pd, "need %d frames for zone %llx\n", |
1da177e4 LT |
1051 | frames_read, (unsigned long long)pkt->sector); |
1052 | pd->stats.pkt_started++; | |
1053 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | /* | |
1057 | * Find a packet matching zone, or the least recently used packet if | |
1058 | * there is no match. | |
1059 | */ | |
1060 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1061 | { | |
1062 | struct packet_data *pkt; | |
1063 | ||
1064 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1065 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1066 | list_del_init(&pkt->list); | |
1067 | if (pkt->sector != zone) | |
1068 | pkt->cache_valid = 0; | |
610827de | 1069 | return pkt; |
1da177e4 LT |
1070 | } |
1071 | } | |
610827de PO |
1072 | BUG(); |
1073 | return NULL; | |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1077 | { | |
1078 | if (pkt->cache_valid) { | |
1079 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1080 | } else { | |
1081 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1082 | } | |
1083 | } | |
1084 | ||
1da177e4 LT |
1085 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) |
1086 | { | |
1087 | #if PACKET_DEBUG > 1 | |
1088 | static const char *state_name[] = { | |
1089 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1090 | }; | |
1091 | enum packet_data_state old_state = pkt->state; | |
844aa797 | 1092 | pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n", |
cd3f2cd0 | 1093 | pkt->id, (unsigned long long)pkt->sector, |
1da177e4 LT |
1094 | state_name[old_state], state_name[state]); |
1095 | #endif | |
1096 | pkt->state = state; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Scan the work queue to see if we can start a new packet. | |
1101 | * returns non-zero if any work was done. | |
1102 | */ | |
1103 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1104 | { | |
1105 | struct packet_data *pkt, *p; | |
1106 | struct bio *bio = NULL; | |
1107 | sector_t zone = 0; /* Suppress gcc warning */ | |
1108 | struct pkt_rb_node *node, *first_node; | |
1109 | struct rb_node *n; | |
0a0fc960 | 1110 | int wakeup; |
1da177e4 | 1111 | |
1da177e4 LT |
1112 | atomic_set(&pd->scan_queue, 0); |
1113 | ||
1114 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
844aa797 | 1115 | pkt_dbg(2, pd, "no pkt\n"); |
1da177e4 LT |
1116 | return 0; |
1117 | } | |
1118 | ||
1119 | /* | |
1120 | * Try to find a zone we are not already working on. | |
1121 | */ | |
1122 | spin_lock(&pd->lock); | |
1123 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1124 | if (!first_node) { | |
1125 | n = rb_first(&pd->bio_queue); | |
1126 | if (n) | |
1127 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1128 | } | |
1129 | node = first_node; | |
1130 | while (node) { | |
1131 | bio = node->bio; | |
4f024f37 | 1132 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 | 1133 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
7baeb6a5 PO |
1134 | if (p->sector == zone) { |
1135 | bio = NULL; | |
1da177e4 | 1136 | goto try_next_bio; |
7baeb6a5 | 1137 | } |
1da177e4 LT |
1138 | } |
1139 | break; | |
1140 | try_next_bio: | |
1141 | node = pkt_rbtree_next(node); | |
1142 | if (!node) { | |
1143 | n = rb_first(&pd->bio_queue); | |
1144 | if (n) | |
1145 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1146 | } | |
1147 | if (node == first_node) | |
1148 | node = NULL; | |
1149 | } | |
1150 | spin_unlock(&pd->lock); | |
1151 | if (!bio) { | |
844aa797 | 1152 | pkt_dbg(2, pd, "no bio\n"); |
1da177e4 LT |
1153 | return 0; |
1154 | } | |
1155 | ||
1156 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1157 | |
1158 | pd->current_sector = zone + pd->settings.size; | |
1159 | pkt->sector = zone; | |
e1bc89bc | 1160 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1161 | pkt->write_size = 0; |
1162 | ||
1163 | /* | |
1164 | * Scan work queue for bios in the same zone and link them | |
1165 | * to this packet. | |
1166 | */ | |
1167 | spin_lock(&pd->lock); | |
844aa797 | 1168 | pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone); |
1da177e4 LT |
1169 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
1170 | bio = node->bio; | |
4f024f37 KO |
1171 | pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long) |
1172 | get_zone(bio->bi_iter.bi_sector, pd)); | |
1173 | if (get_zone(bio->bi_iter.bi_sector, pd) != zone) | |
1da177e4 LT |
1174 | break; |
1175 | pkt_rbtree_erase(pd, node); | |
1176 | spin_lock(&pkt->lock); | |
c5ecc484 | 1177 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 | 1178 | pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE; |
1da177e4 LT |
1179 | spin_unlock(&pkt->lock); |
1180 | } | |
0a0fc960 TM |
1181 | /* check write congestion marks, and if bio_queue_size is |
1182 | below, wake up any waiters */ | |
1183 | wakeup = (pd->write_congestion_on > 0 | |
1184 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1185 | spin_unlock(&pd->lock); |
edb0872f CH |
1186 | if (wakeup) |
1187 | clear_bdi_congested(pd->disk->bdi, BLK_RW_ASYNC); | |
1da177e4 LT |
1188 | |
1189 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1190 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1191 | atomic_set(&pkt->run_sm, 1); | |
1192 | ||
1193 | spin_lock(&pd->cdrw.active_list_lock); | |
1194 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1195 | spin_unlock(&pd->cdrw.active_list_lock); | |
1196 | ||
1197 | return 1; | |
1198 | } | |
1199 | ||
5f03414d CH |
1200 | /** |
1201 | * bio_list_copy_data - copy contents of data buffers from one chain of bios to | |
1202 | * another | |
1203 | * @src: source bio list | |
1204 | * @dst: destination bio list | |
1205 | * | |
1206 | * Stops when it reaches the end of either the @src list or @dst list - that is, | |
1207 | * copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of | |
1208 | * bios). | |
1209 | */ | |
1210 | static void bio_list_copy_data(struct bio *dst, struct bio *src) | |
1211 | { | |
1212 | struct bvec_iter src_iter = src->bi_iter; | |
1213 | struct bvec_iter dst_iter = dst->bi_iter; | |
1214 | ||
1215 | while (1) { | |
1216 | if (!src_iter.bi_size) { | |
1217 | src = src->bi_next; | |
1218 | if (!src) | |
1219 | break; | |
1220 | ||
1221 | src_iter = src->bi_iter; | |
1222 | } | |
1223 | ||
1224 | if (!dst_iter.bi_size) { | |
1225 | dst = dst->bi_next; | |
1226 | if (!dst) | |
1227 | break; | |
1228 | ||
1229 | dst_iter = dst->bi_iter; | |
1230 | } | |
1231 | ||
1232 | bio_copy_data_iter(dst, &dst_iter, src, &src_iter); | |
1233 | } | |
1234 | } | |
1235 | ||
1da177e4 LT |
1236 | /* |
1237 | * Assemble a bio to write one packet and queue the bio for processing | |
1238 | * by the underlying block device. | |
1239 | */ | |
1240 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1241 | { | |
1da177e4 | 1242 | int f; |
1da177e4 | 1243 | |
ffb25dc6 | 1244 | bio_reset(pkt->w_bio); |
4f024f37 | 1245 | pkt->w_bio->bi_iter.bi_sector = pkt->sector; |
74d46992 | 1246 | bio_set_dev(pkt->w_bio, pd->bdev); |
ffb25dc6 KO |
1247 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; |
1248 | pkt->w_bio->bi_private = pkt; | |
1249 | ||
1250 | /* XXX: locking? */ | |
1da177e4 | 1251 | for (f = 0; f < pkt->frames; f++) { |
feebd568 CH |
1252 | struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1253 | unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1254 | ||
1255 | if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset)) | |
ffb25dc6 | 1256 | BUG(); |
1da177e4 | 1257 | } |
844aa797 | 1258 | pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1259 | |
1260 | /* | |
72772323 | 1261 | * Fill-in bvec with data from orig_bios. |
1da177e4 | 1262 | */ |
1da177e4 | 1263 | spin_lock(&pkt->lock); |
45db54d5 | 1264 | bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head); |
1da177e4 | 1265 | |
1da177e4 LT |
1266 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
1267 | spin_unlock(&pkt->lock); | |
1268 | ||
844aa797 | 1269 | pkt_dbg(2, pd, "Writing %d frames for zone %llx\n", |
ffb25dc6 | 1270 | pkt->write_size, (unsigned long long)pkt->sector); |
1da177e4 | 1271 | |
feebd568 | 1272 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) |
1da177e4 | 1273 | pkt->cache_valid = 1; |
feebd568 | 1274 | else |
1da177e4 | 1275 | pkt->cache_valid = 0; |
1da177e4 LT |
1276 | |
1277 | /* Start the write request */ | |
1da177e4 | 1278 | atomic_set(&pkt->io_wait, 1); |
95fe6c1a | 1279 | bio_set_op_attrs(pkt->w_bio, REQ_OP_WRITE, 0); |
46c271be | 1280 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1281 | } |
1282 | ||
4e4cbee9 | 1283 | static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status) |
1da177e4 | 1284 | { |
c5ecc484 | 1285 | struct bio *bio; |
1da177e4 | 1286 | |
4e4cbee9 | 1287 | if (status) |
1da177e4 LT |
1288 | pkt->cache_valid = 0; |
1289 | ||
1290 | /* Finish all bios corresponding to this packet */ | |
4246a0b6 | 1291 | while ((bio = bio_list_pop(&pkt->orig_bios))) { |
4e4cbee9 | 1292 | bio->bi_status = status; |
4246a0b6 CH |
1293 | bio_endio(bio); |
1294 | } | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1298 | { | |
844aa797 | 1299 | pkt_dbg(2, pd, "pkt %d\n", pkt->id); |
1da177e4 LT |
1300 | |
1301 | for (;;) { | |
1302 | switch (pkt->state) { | |
1303 | case PACKET_WAITING_STATE: | |
1304 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1305 | return; | |
1306 | ||
1307 | pkt->sleep_time = 0; | |
1308 | pkt_gather_data(pd, pkt); | |
1309 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1310 | break; | |
1311 | ||
1312 | case PACKET_READ_WAIT_STATE: | |
1313 | if (atomic_read(&pkt->io_wait) > 0) | |
1314 | return; | |
1315 | ||
1316 | if (atomic_read(&pkt->io_errors) > 0) { | |
1317 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1318 | } else { | |
1319 | pkt_start_write(pd, pkt); | |
1320 | } | |
1321 | break; | |
1322 | ||
1323 | case PACKET_WRITE_WAIT_STATE: | |
1324 | if (atomic_read(&pkt->io_wait) > 0) | |
1325 | return; | |
1326 | ||
4e4cbee9 | 1327 | if (!pkt->w_bio->bi_status) { |
1da177e4 LT |
1328 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1329 | } else { | |
1330 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1331 | } | |
1332 | break; | |
1333 | ||
1334 | case PACKET_RECOVERY_STATE: | |
2d9e28a9 CH |
1335 | pkt_dbg(2, pd, "No recovery possible\n"); |
1336 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1da177e4 LT |
1337 | break; |
1338 | ||
1339 | case PACKET_FINISHED_STATE: | |
4e4cbee9 | 1340 | pkt_finish_packet(pkt, pkt->w_bio->bi_status); |
1da177e4 LT |
1341 | return; |
1342 | ||
1343 | default: | |
1344 | BUG(); | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1351 | { | |
1352 | struct packet_data *pkt, *next; | |
1353 | ||
1da177e4 LT |
1354 | /* |
1355 | * Run state machine for active packets | |
1356 | */ | |
1357 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1358 | if (atomic_read(&pkt->run_sm) > 0) { | |
1359 | atomic_set(&pkt->run_sm, 0); | |
1360 | pkt_run_state_machine(pd, pkt); | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Move no longer active packets to the free list | |
1366 | */ | |
1367 | spin_lock(&pd->cdrw.active_list_lock); | |
1368 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1369 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1370 | list_del(&pkt->list); | |
1371 | pkt_put_packet_data(pd, pkt); | |
1372 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1373 | atomic_set(&pd->scan_queue, 1); | |
1374 | } | |
1375 | } | |
1376 | spin_unlock(&pd->cdrw.active_list_lock); | |
1377 | } | |
1378 | ||
1379 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1380 | { | |
1381 | struct packet_data *pkt; | |
1382 | int i; | |
1383 | ||
ae7642bb | 1384 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1385 | states[i] = 0; |
1386 | ||
1387 | spin_lock(&pd->cdrw.active_list_lock); | |
1388 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1389 | states[pkt->state]++; | |
1390 | } | |
1391 | spin_unlock(&pd->cdrw.active_list_lock); | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * kcdrwd is woken up when writes have been queued for one of our | |
1396 | * registered devices | |
1397 | */ | |
1398 | static int kcdrwd(void *foobar) | |
1399 | { | |
1400 | struct pktcdvd_device *pd = foobar; | |
1401 | struct packet_data *pkt; | |
1402 | long min_sleep_time, residue; | |
1403 | ||
8698a745 | 1404 | set_user_nice(current, MIN_NICE); |
83144186 | 1405 | set_freezable(); |
1da177e4 LT |
1406 | |
1407 | for (;;) { | |
1408 | DECLARE_WAITQUEUE(wait, current); | |
1409 | ||
1410 | /* | |
1411 | * Wait until there is something to do | |
1412 | */ | |
1413 | add_wait_queue(&pd->wqueue, &wait); | |
1414 | for (;;) { | |
1415 | set_current_state(TASK_INTERRUPTIBLE); | |
1416 | ||
1417 | /* Check if we need to run pkt_handle_queue */ | |
1418 | if (atomic_read(&pd->scan_queue) > 0) | |
1419 | goto work_to_do; | |
1420 | ||
1421 | /* Check if we need to run the state machine for some packet */ | |
1422 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1423 | if (atomic_read(&pkt->run_sm) > 0) | |
1424 | goto work_to_do; | |
1425 | } | |
1426 | ||
1427 | /* Check if we need to process the iosched queues */ | |
1428 | if (atomic_read(&pd->iosched.attention) != 0) | |
1429 | goto work_to_do; | |
1430 | ||
1431 | /* Otherwise, go to sleep */ | |
1432 | if (PACKET_DEBUG > 1) { | |
1433 | int states[PACKET_NUM_STATES]; | |
1434 | pkt_count_states(pd, states); | |
844aa797 | 1435 | pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
cd3f2cd0 JP |
1436 | states[0], states[1], states[2], |
1437 | states[3], states[4], states[5]); | |
1da177e4 LT |
1438 | } |
1439 | ||
1440 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1441 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1442 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1443 | min_sleep_time = pkt->sleep_time; | |
1444 | } | |
1445 | ||
844aa797 | 1446 | pkt_dbg(2, pd, "sleeping\n"); |
1da177e4 | 1447 | residue = schedule_timeout(min_sleep_time); |
844aa797 | 1448 | pkt_dbg(2, pd, "wake up\n"); |
1da177e4 LT |
1449 | |
1450 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1451 | try_to_freeze(); |
1da177e4 LT |
1452 | |
1453 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1454 | if (!pkt->sleep_time) | |
1455 | continue; | |
1456 | pkt->sleep_time -= min_sleep_time - residue; | |
1457 | if (pkt->sleep_time <= 0) { | |
1458 | pkt->sleep_time = 0; | |
1459 | atomic_inc(&pkt->run_sm); | |
1460 | } | |
1461 | } | |
1462 | ||
1da177e4 LT |
1463 | if (kthread_should_stop()) |
1464 | break; | |
1465 | } | |
1466 | work_to_do: | |
1467 | set_current_state(TASK_RUNNING); | |
1468 | remove_wait_queue(&pd->wqueue, &wait); | |
1469 | ||
1470 | if (kthread_should_stop()) | |
1471 | break; | |
1472 | ||
1473 | /* | |
1474 | * if pkt_handle_queue returns true, we can queue | |
1475 | * another request. | |
1476 | */ | |
1477 | while (pkt_handle_queue(pd)) | |
1478 | ; | |
1479 | ||
1480 | /* | |
1481 | * Handle packet state machine | |
1482 | */ | |
1483 | pkt_handle_packets(pd); | |
1484 | ||
1485 | /* | |
1486 | * Handle iosched queues | |
1487 | */ | |
1488 | pkt_iosched_process_queue(pd); | |
1489 | } | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1495 | { | |
0c075d64 JP |
1496 | pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n", |
1497 | pd->settings.fp ? "Fixed" : "Variable", | |
1498 | pd->settings.size >> 2, | |
1499 | pd->settings.block_mode == 8 ? '1' : '2'); | |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1503 | { | |
1504 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1505 | ||
1506 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1507 | cgc->cmd[2] = page_code | (page_control << 6); | |
1508 | cgc->cmd[7] = cgc->buflen >> 8; | |
1509 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1510 | cgc->data_direction = CGC_DATA_READ; | |
1511 | return pkt_generic_packet(pd, cgc); | |
1512 | } | |
1513 | ||
1514 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1515 | { | |
1516 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1517 | memset(cgc->buffer, 0, 2); | |
1518 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1519 | cgc->cmd[1] = 0x10; /* PF */ | |
1520 | cgc->cmd[7] = cgc->buflen >> 8; | |
1521 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1522 | cgc->data_direction = CGC_DATA_WRITE; | |
1523 | return pkt_generic_packet(pd, cgc); | |
1524 | } | |
1525 | ||
1526 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1527 | { | |
1528 | struct packet_command cgc; | |
1529 | int ret; | |
1530 | ||
1531 | /* set up command and get the disc info */ | |
1532 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1533 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1534 | cgc.cmd[8] = cgc.buflen = 2; | |
1535 | cgc.quiet = 1; | |
1536 | ||
ada94973 RH |
1537 | ret = pkt_generic_packet(pd, &cgc); |
1538 | if (ret) | |
1da177e4 LT |
1539 | return ret; |
1540 | ||
1541 | /* not all drives have the same disc_info length, so requeue | |
1542 | * packet with the length the drive tells us it can supply | |
1543 | */ | |
1544 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1545 | sizeof(di->disc_information_length); | |
1546 | ||
1547 | if (cgc.buflen > sizeof(disc_information)) | |
1548 | cgc.buflen = sizeof(disc_information); | |
1549 | ||
1550 | cgc.cmd[8] = cgc.buflen; | |
1551 | return pkt_generic_packet(pd, &cgc); | |
1552 | } | |
1553 | ||
1554 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1555 | { | |
1556 | struct packet_command cgc; | |
1557 | int ret; | |
1558 | ||
1559 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1560 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1561 | cgc.cmd[1] = type & 3; | |
1562 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1563 | cgc.cmd[5] = track & 0xff; | |
1564 | cgc.cmd[8] = 8; | |
1565 | cgc.quiet = 1; | |
1566 | ||
ada94973 RH |
1567 | ret = pkt_generic_packet(pd, &cgc); |
1568 | if (ret) | |
1da177e4 LT |
1569 | return ret; |
1570 | ||
1571 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1572 | sizeof(ti->track_information_length); | |
1573 | ||
1574 | if (cgc.buflen > sizeof(track_information)) | |
1575 | cgc.buflen = sizeof(track_information); | |
1576 | ||
1577 | cgc.cmd[8] = cgc.buflen; | |
1578 | return pkt_generic_packet(pd, &cgc); | |
1579 | } | |
1580 | ||
05680d86 PO |
1581 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1582 | long *last_written) | |
1da177e4 LT |
1583 | { |
1584 | disc_information di; | |
1585 | track_information ti; | |
1586 | __u32 last_track; | |
8d20319e | 1587 | int ret; |
1da177e4 | 1588 | |
ada94973 RH |
1589 | ret = pkt_get_disc_info(pd, &di); |
1590 | if (ret) | |
1da177e4 LT |
1591 | return ret; |
1592 | ||
1593 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
ada94973 RH |
1594 | ret = pkt_get_track_info(pd, last_track, 1, &ti); |
1595 | if (ret) | |
1da177e4 LT |
1596 | return ret; |
1597 | ||
1598 | /* if this track is blank, try the previous. */ | |
1599 | if (ti.blank) { | |
1600 | last_track--; | |
ada94973 RH |
1601 | ret = pkt_get_track_info(pd, last_track, 1, &ti); |
1602 | if (ret) | |
1da177e4 LT |
1603 | return ret; |
1604 | } | |
1605 | ||
1606 | /* if last recorded field is valid, return it. */ | |
1607 | if (ti.lra_v) { | |
1608 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1609 | } else { | |
1610 | /* make it up instead */ | |
1611 | *last_written = be32_to_cpu(ti.track_start) + | |
1612 | be32_to_cpu(ti.track_size); | |
1613 | if (ti.free_blocks) | |
1614 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1615 | } | |
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | /* | |
1620 | * write mode select package based on pd->settings | |
1621 | */ | |
05680d86 | 1622 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1623 | { |
1624 | struct packet_command cgc; | |
e7d0748d | 1625 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
1626 | write_param_page *wp; |
1627 | char buffer[128]; | |
1628 | int ret, size; | |
1629 | ||
1630 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1631 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1632 | return 0; | |
1633 | ||
1634 | memset(buffer, 0, sizeof(buffer)); | |
1635 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
e7d0748d | 1636 | cgc.sshdr = &sshdr; |
ada94973 RH |
1637 | ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0); |
1638 | if (ret) { | |
f3ded788 | 1639 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1640 | return ret; |
1641 | } | |
1642 | ||
1643 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1644 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1645 | if (size > sizeof(buffer)) | |
1646 | size = sizeof(buffer); | |
1647 | ||
1648 | /* | |
1649 | * now get it all | |
1650 | */ | |
1651 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
e7d0748d | 1652 | cgc.sshdr = &sshdr; |
ada94973 RH |
1653 | ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0); |
1654 | if (ret) { | |
f3ded788 | 1655 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1656 | return ret; |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * write page is offset header + block descriptor length | |
1661 | */ | |
1662 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1663 | ||
1664 | wp->fp = pd->settings.fp; | |
1665 | wp->track_mode = pd->settings.track_mode; | |
1666 | wp->write_type = pd->settings.write_type; | |
1667 | wp->data_block_type = pd->settings.block_mode; | |
1668 | ||
1669 | wp->multi_session = 0; | |
1670 | ||
1671 | #ifdef PACKET_USE_LS | |
1672 | wp->link_size = 7; | |
1673 | wp->ls_v = 1; | |
1674 | #endif | |
1675 | ||
1676 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1677 | wp->session_format = 0; | |
1678 | wp->subhdr2 = 0x20; | |
1679 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1680 | wp->session_format = 0x20; | |
1681 | wp->subhdr2 = 8; | |
1682 | #if 0 | |
1683 | wp->mcn[0] = 0x80; | |
1684 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1685 | #endif | |
1686 | } else { | |
1687 | /* | |
1688 | * paranoia | |
1689 | */ | |
fa63c0ab | 1690 | pkt_err(pd, "write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1691 | return 1; |
1692 | } | |
1693 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1694 | ||
1695 | cgc.buflen = cgc.cmd[8] = size; | |
ada94973 RH |
1696 | ret = pkt_mode_select(pd, &cgc); |
1697 | if (ret) { | |
f3ded788 | 1698 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1699 | return ret; |
1700 | } | |
1701 | ||
1702 | pkt_print_settings(pd); | |
1703 | return 0; | |
1704 | } | |
1705 | ||
1706 | /* | |
7c613d59 | 1707 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1708 | */ |
ab863ec3 | 1709 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1710 | { |
ab863ec3 PO |
1711 | switch (pd->mmc3_profile) { |
1712 | case 0x1a: /* DVD+RW */ | |
1713 | case 0x12: /* DVD-RAM */ | |
1714 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1715 | return 1; | |
1716 | default: | |
1717 | break; | |
1718 | } | |
1da177e4 | 1719 | |
ab863ec3 PO |
1720 | if (!ti->packet || !ti->fp) |
1721 | return 0; | |
1da177e4 LT |
1722 | |
1723 | /* | |
1724 | * "good" settings as per Mt Fuji. | |
1725 | */ | |
ab863ec3 | 1726 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1727 | return 1; |
1da177e4 | 1728 | |
ab863ec3 | 1729 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1730 | return 1; |
1da177e4 | 1731 | |
ab863ec3 | 1732 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1733 | return 1; |
1da177e4 | 1734 | |
fa63c0ab | 1735 | pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1736 | return 0; |
1da177e4 LT |
1737 | } |
1738 | ||
1739 | /* | |
7c613d59 | 1740 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1741 | */ |
7c613d59 | 1742 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1743 | { |
1744 | switch (pd->mmc3_profile) { | |
1745 | case 0x0a: /* CD-RW */ | |
1746 | case 0xffff: /* MMC3 not supported */ | |
1747 | break; | |
1748 | case 0x1a: /* DVD+RW */ | |
1749 | case 0x13: /* DVD-RW */ | |
1750 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1751 | return 1; |
1da177e4 | 1752 | default: |
844aa797 | 1753 | pkt_dbg(2, pd, "Wrong disc profile (%x)\n", |
cd3f2cd0 | 1754 | pd->mmc3_profile); |
7c613d59 | 1755 | return 0; |
1da177e4 LT |
1756 | } |
1757 | ||
1758 | /* | |
1759 | * for disc type 0xff we should probably reserve a new track. | |
1760 | * but i'm not sure, should we leave this to user apps? probably. | |
1761 | */ | |
1762 | if (di->disc_type == 0xff) { | |
ca73dabc | 1763 | pkt_notice(pd, "unknown disc - no track?\n"); |
7c613d59 | 1764 | return 0; |
1da177e4 LT |
1765 | } |
1766 | ||
1767 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
fa63c0ab | 1768 | pkt_err(pd, "wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1769 | return 0; |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | if (di->erasable == 0) { | |
ca73dabc | 1773 | pkt_notice(pd, "disc not erasable\n"); |
7c613d59 | 1774 | return 0; |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
fa63c0ab | 1778 | pkt_err(pd, "can't write to last track (reserved)\n"); |
7c613d59 | 1779 | return 0; |
1da177e4 LT |
1780 | } |
1781 | ||
7c613d59 | 1782 | return 1; |
1da177e4 LT |
1783 | } |
1784 | ||
05680d86 | 1785 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1786 | { |
1787 | struct packet_command cgc; | |
1788 | unsigned char buf[12]; | |
1789 | disc_information di; | |
1790 | track_information ti; | |
1791 | int ret, track; | |
1792 | ||
1793 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1794 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1795 | cgc.cmd[8] = 8; | |
1796 | ret = pkt_generic_packet(pd, &cgc); | |
1797 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1798 | ||
1799 | memset(&di, 0, sizeof(disc_information)); | |
1800 | memset(&ti, 0, sizeof(track_information)); | |
1801 | ||
ada94973 RH |
1802 | ret = pkt_get_disc_info(pd, &di); |
1803 | if (ret) { | |
fa63c0ab | 1804 | pkt_err(pd, "failed get_disc\n"); |
1da177e4 LT |
1805 | return ret; |
1806 | } | |
1807 | ||
7c613d59 | 1808 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1809 | return -EROFS; |
1da177e4 | 1810 | |
1da177e4 LT |
1811 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1812 | ||
1813 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
ada94973 RH |
1814 | ret = pkt_get_track_info(pd, track, 1, &ti); |
1815 | if (ret) { | |
fa63c0ab | 1816 | pkt_err(pd, "failed get_track\n"); |
1da177e4 LT |
1817 | return ret; |
1818 | } | |
1819 | ||
ab863ec3 | 1820 | if (!pkt_writable_track(pd, &ti)) { |
fa63c0ab | 1821 | pkt_err(pd, "can't write to this track\n"); |
9db91546 | 1822 | return -EROFS; |
1da177e4 LT |
1823 | } |
1824 | ||
1825 | /* | |
1826 | * we keep packet size in 512 byte units, makes it easier to | |
1827 | * deal with request calculations. | |
1828 | */ | |
1829 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1830 | if (pd->settings.size == 0) { | |
ca73dabc | 1831 | pkt_notice(pd, "detected zero packet size!\n"); |
a460ad62 | 1832 | return -ENXIO; |
1da177e4 | 1833 | } |
d0272e78 | 1834 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
fa63c0ab | 1835 | pkt_err(pd, "packet size is too big\n"); |
9db91546 | 1836 | return -EROFS; |
d0272e78 | 1837 | } |
1da177e4 LT |
1838 | pd->settings.fp = ti.fp; |
1839 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1840 | ||
1841 | if (ti.nwa_v) { | |
1842 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1843 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * in theory we could use lra on -RW media as well and just zero | |
1848 | * blocks that haven't been written yet, but in practice that | |
1849 | * is just a no-go. we'll use that for -R, naturally. | |
1850 | */ | |
1851 | if (ti.lra_v) { | |
1852 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1853 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1854 | } else { | |
1855 | pd->lra = 0xffffffff; | |
1856 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1857 | } | |
1858 | ||
1859 | /* | |
1860 | * fine for now | |
1861 | */ | |
1862 | pd->settings.link_loss = 7; | |
1863 | pd->settings.write_type = 0; /* packet */ | |
1864 | pd->settings.track_mode = ti.track_mode; | |
1865 | ||
1866 | /* | |
1867 | * mode1 or mode2 disc | |
1868 | */ | |
1869 | switch (ti.data_mode) { | |
1870 | case PACKET_MODE1: | |
1871 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1872 | break; | |
1873 | case PACKET_MODE2: | |
1874 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1875 | break; | |
1876 | default: | |
fa63c0ab | 1877 | pkt_err(pd, "unknown data mode\n"); |
9db91546 | 1878 | return -EROFS; |
1da177e4 LT |
1879 | } |
1880 | return 0; | |
1881 | } | |
1882 | ||
1883 | /* | |
1884 | * enable/disable write caching on drive | |
1885 | */ | |
05680d86 PO |
1886 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
1887 | int set) | |
1da177e4 LT |
1888 | { |
1889 | struct packet_command cgc; | |
e7d0748d | 1890 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
1891 | unsigned char buf[64]; |
1892 | int ret; | |
1893 | ||
1da177e4 | 1894 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
e7d0748d | 1895 | cgc.sshdr = &sshdr; |
1da177e4 LT |
1896 | cgc.buflen = pd->mode_offset + 12; |
1897 | ||
1898 | /* | |
1899 | * caching mode page might not be there, so quiet this command | |
1900 | */ | |
1901 | cgc.quiet = 1; | |
1902 | ||
ada94973 RH |
1903 | ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0); |
1904 | if (ret) | |
1da177e4 LT |
1905 | return ret; |
1906 | ||
1907 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1908 | ||
1909 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1910 | ret = pkt_mode_select(pd, &cgc); | |
1911 | if (ret) { | |
fa63c0ab | 1912 | pkt_err(pd, "write caching control failed\n"); |
f3ded788 | 1913 | pkt_dump_sense(pd, &cgc); |
1da177e4 | 1914 | } else if (!ret && set) |
ca73dabc | 1915 | pkt_notice(pd, "enabled write caching\n"); |
1da177e4 LT |
1916 | return ret; |
1917 | } | |
1918 | ||
1919 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1920 | { | |
1921 | struct packet_command cgc; | |
1922 | ||
1923 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1924 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1925 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1926 | return pkt_generic_packet(pd, &cgc); | |
1927 | } | |
1928 | ||
1929 | /* | |
1930 | * Returns drive maximum write speed | |
1931 | */ | |
05680d86 PO |
1932 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
1933 | unsigned *write_speed) | |
1da177e4 LT |
1934 | { |
1935 | struct packet_command cgc; | |
e7d0748d | 1936 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
1937 | unsigned char buf[256+18]; |
1938 | unsigned char *cap_buf; | |
1939 | int ret, offset; | |
1940 | ||
1da177e4 LT |
1941 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
1942 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
e7d0748d | 1943 | cgc.sshdr = &sshdr; |
1da177e4 LT |
1944 | |
1945 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1946 | if (ret) { | |
1947 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
1948 | sizeof(struct mode_page_header); | |
1949 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1950 | if (ret) { | |
f3ded788 | 1951 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1952 | return ret; |
1953 | } | |
1954 | } | |
1955 | ||
1956 | offset = 20; /* Obsoleted field, used by older drives */ | |
1957 | if (cap_buf[1] >= 28) | |
1958 | offset = 28; /* Current write speed selected */ | |
1959 | if (cap_buf[1] >= 30) { | |
1960 | /* If the drive reports at least one "Logical Unit Write | |
1961 | * Speed Performance Descriptor Block", use the information | |
1962 | * in the first block. (contains the highest speed) | |
1963 | */ | |
1964 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
1965 | if (num_spdb > 0) | |
1966 | offset = 34; | |
1967 | } | |
1968 | ||
1969 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
1970 | return 0; | |
1971 | } | |
1972 | ||
1973 | /* These tables from cdrecord - I don't have orange book */ | |
1974 | /* standard speed CD-RW (1-4x) */ | |
1975 | static char clv_to_speed[16] = { | |
1976 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1977 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1978 | }; | |
1979 | /* high speed CD-RW (-10x) */ | |
1980 | static char hs_clv_to_speed[16] = { | |
1981 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1982 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1983 | }; | |
1984 | /* ultra high speed CD-RW */ | |
1985 | static char us_clv_to_speed[16] = { | |
1986 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1987 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
1988 | }; | |
1989 | ||
1990 | /* | |
1991 | * reads the maximum media speed from ATIP | |
1992 | */ | |
05680d86 PO |
1993 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
1994 | unsigned *speed) | |
1da177e4 LT |
1995 | { |
1996 | struct packet_command cgc; | |
e7d0748d | 1997 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
1998 | unsigned char buf[64]; |
1999 | unsigned int size, st, sp; | |
2000 | int ret; | |
2001 | ||
2002 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
e7d0748d | 2003 | cgc.sshdr = &sshdr; |
1da177e4 LT |
2004 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
2005 | cgc.cmd[1] = 2; | |
2006 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2007 | cgc.cmd[8] = 2; | |
2008 | ret = pkt_generic_packet(pd, &cgc); | |
2009 | if (ret) { | |
f3ded788 | 2010 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2011 | return ret; |
2012 | } | |
2013 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2014 | if (size > sizeof(buf)) | |
2015 | size = sizeof(buf); | |
2016 | ||
2017 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
e7d0748d | 2018 | cgc.sshdr = &sshdr; |
1da177e4 LT |
2019 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
2020 | cgc.cmd[1] = 2; | |
2021 | cgc.cmd[2] = 4; | |
2022 | cgc.cmd[8] = size; | |
2023 | ret = pkt_generic_packet(pd, &cgc); | |
2024 | if (ret) { | |
f3ded788 | 2025 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2026 | return ret; |
2027 | } | |
2028 | ||
eaa0ff15 | 2029 | if (!(buf[6] & 0x40)) { |
ca73dabc | 2030 | pkt_notice(pd, "disc type is not CD-RW\n"); |
1da177e4 LT |
2031 | return 1; |
2032 | } | |
eaa0ff15 | 2033 | if (!(buf[6] & 0x4)) { |
ca73dabc | 2034 | pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2035 | return 1; |
2036 | } | |
2037 | ||
2038 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2039 | ||
2040 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2041 | ||
2042 | /* Info from cdrecord */ | |
2043 | switch (st) { | |
2044 | case 0: /* standard speed */ | |
2045 | *speed = clv_to_speed[sp]; | |
2046 | break; | |
2047 | case 1: /* high speed */ | |
2048 | *speed = hs_clv_to_speed[sp]; | |
2049 | break; | |
2050 | case 2: /* ultra high speed */ | |
2051 | *speed = us_clv_to_speed[sp]; | |
2052 | break; | |
2053 | default: | |
ca73dabc | 2054 | pkt_notice(pd, "unknown disc sub-type %d\n", st); |
1da177e4 LT |
2055 | return 1; |
2056 | } | |
2057 | if (*speed) { | |
0c075d64 | 2058 | pkt_info(pd, "maximum media speed: %d\n", *speed); |
1da177e4 LT |
2059 | return 0; |
2060 | } else { | |
ca73dabc | 2061 | pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st); |
1da177e4 LT |
2062 | return 1; |
2063 | } | |
2064 | } | |
2065 | ||
05680d86 | 2066 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2067 | { |
2068 | struct packet_command cgc; | |
e7d0748d | 2069 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
2070 | int ret; |
2071 | ||
844aa797 | 2072 | pkt_dbg(2, pd, "Performing OPC\n"); |
1da177e4 LT |
2073 | |
2074 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
e7d0748d | 2075 | cgc.sshdr = &sshdr; |
1da177e4 LT |
2076 | cgc.timeout = 60*HZ; |
2077 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2078 | cgc.cmd[1] = 1; | |
ada94973 RH |
2079 | ret = pkt_generic_packet(pd, &cgc); |
2080 | if (ret) | |
f3ded788 | 2081 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2082 | return ret; |
2083 | } | |
2084 | ||
2085 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2086 | { | |
2087 | int ret; | |
2088 | unsigned int write_speed, media_write_speed, read_speed; | |
2089 | ||
ada94973 RH |
2090 | ret = pkt_probe_settings(pd); |
2091 | if (ret) { | |
844aa797 | 2092 | pkt_dbg(2, pd, "failed probe\n"); |
9db91546 | 2093 | return ret; |
1da177e4 LT |
2094 | } |
2095 | ||
ada94973 RH |
2096 | ret = pkt_set_write_settings(pd); |
2097 | if (ret) { | |
844aa797 | 2098 | pkt_dbg(1, pd, "failed saving write settings\n"); |
1da177e4 LT |
2099 | return -EIO; |
2100 | } | |
2101 | ||
2102 | pkt_write_caching(pd, USE_WCACHING); | |
2103 | ||
ada94973 RH |
2104 | ret = pkt_get_max_speed(pd, &write_speed); |
2105 | if (ret) | |
1da177e4 LT |
2106 | write_speed = 16 * 177; |
2107 | switch (pd->mmc3_profile) { | |
2108 | case 0x13: /* DVD-RW */ | |
2109 | case 0x1a: /* DVD+RW */ | |
2110 | case 0x12: /* DVD-RAM */ | |
844aa797 | 2111 | pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2112 | break; |
2113 | default: | |
ada94973 RH |
2114 | ret = pkt_media_speed(pd, &media_write_speed); |
2115 | if (ret) | |
1da177e4 LT |
2116 | media_write_speed = 16; |
2117 | write_speed = min(write_speed, media_write_speed * 177); | |
844aa797 | 2118 | pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2119 | break; |
2120 | } | |
2121 | read_speed = write_speed; | |
2122 | ||
ada94973 RH |
2123 | ret = pkt_set_speed(pd, write_speed, read_speed); |
2124 | if (ret) { | |
844aa797 | 2125 | pkt_dbg(1, pd, "couldn't set write speed\n"); |
1da177e4 LT |
2126 | return -EIO; |
2127 | } | |
2128 | pd->write_speed = write_speed; | |
2129 | pd->read_speed = read_speed; | |
2130 | ||
ada94973 RH |
2131 | ret = pkt_perform_opc(pd); |
2132 | if (ret) { | |
844aa797 | 2133 | pkt_dbg(1, pd, "Optimum Power Calibration failed\n"); |
1da177e4 LT |
2134 | } |
2135 | ||
2136 | return 0; | |
2137 | } | |
2138 | ||
2139 | /* | |
2140 | * called at open time. | |
2141 | */ | |
aeb5d727 | 2142 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
1da177e4 LT |
2143 | { |
2144 | int ret; | |
2145 | long lba; | |
165125e1 | 2146 | struct request_queue *q; |
b8d95484 | 2147 | struct block_device *bdev; |
1da177e4 LT |
2148 | |
2149 | /* | |
2150 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2151 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
b8d95484 | 2152 | * so open should not fail. |
1da177e4 | 2153 | */ |
b8d95484 CH |
2154 | bdev = blkdev_get_by_dev(pd->bdev->bd_dev, FMODE_READ | FMODE_EXCL, pd); |
2155 | if (IS_ERR(bdev)) { | |
2156 | ret = PTR_ERR(bdev); | |
1da177e4 | 2157 | goto out; |
b8d95484 | 2158 | } |
1da177e4 | 2159 | |
ada94973 RH |
2160 | ret = pkt_get_last_written(pd, &lba); |
2161 | if (ret) { | |
fa63c0ab | 2162 | pkt_err(pd, "pkt_get_last_written failed\n"); |
e525fd89 | 2163 | goto out_putdev; |
1da177e4 LT |
2164 | } |
2165 | ||
2166 | set_capacity(pd->disk, lba << 2); | |
657985f8 | 2167 | set_capacity_and_notify(pd->bdev->bd_disk, lba << 2); |
1da177e4 LT |
2168 | |
2169 | q = bdev_get_queue(pd->bdev); | |
2170 | if (write) { | |
ada94973 RH |
2171 | ret = pkt_open_write(pd); |
2172 | if (ret) | |
e525fd89 | 2173 | goto out_putdev; |
1da177e4 LT |
2174 | /* |
2175 | * Some CDRW drives can not handle writes larger than one packet, | |
2176 | * even if the size is a multiple of the packet size. | |
2177 | */ | |
086fa5ff | 2178 | blk_queue_max_hw_sectors(q, pd->settings.size); |
1da177e4 LT |
2179 | set_bit(PACKET_WRITABLE, &pd->flags); |
2180 | } else { | |
2181 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2182 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2183 | } | |
2184 | ||
ada94973 RH |
2185 | ret = pkt_set_segment_merging(pd, q); |
2186 | if (ret) | |
e525fd89 | 2187 | goto out_putdev; |
1da177e4 | 2188 | |
e1bc89bc PO |
2189 | if (write) { |
2190 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
fa63c0ab | 2191 | pkt_err(pd, "not enough memory for buffers\n"); |
e1bc89bc | 2192 | ret = -ENOMEM; |
e525fd89 | 2193 | goto out_putdev; |
e1bc89bc | 2194 | } |
0c075d64 | 2195 | pkt_info(pd, "%lukB available on disc\n", lba << 1); |
e1bc89bc | 2196 | } |
1da177e4 LT |
2197 | |
2198 | return 0; | |
2199 | ||
2200 | out_putdev: | |
b8d95484 | 2201 | blkdev_put(bdev, FMODE_READ | FMODE_EXCL); |
1da177e4 LT |
2202 | out: |
2203 | return ret; | |
2204 | } | |
2205 | ||
2206 | /* | |
2207 | * called when the device is closed. makes sure that the device flushes | |
2208 | * the internal cache before we close. | |
2209 | */ | |
2210 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2211 | { | |
2212 | if (flush && pkt_flush_cache(pd)) | |
844aa797 | 2213 | pkt_dbg(1, pd, "not flushing cache\n"); |
1da177e4 LT |
2214 | |
2215 | pkt_lock_door(pd, 0); | |
2216 | ||
2217 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
e525fd89 | 2218 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
e1bc89bc PO |
2219 | |
2220 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2221 | } |
2222 | ||
252a52aa | 2223 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) |
1da177e4 LT |
2224 | { |
2225 | if (dev_minor >= MAX_WRITERS) | |
2226 | return NULL; | |
55690c07 JP |
2227 | |
2228 | dev_minor = array_index_nospec(dev_minor, MAX_WRITERS); | |
1da177e4 LT |
2229 | return pkt_devs[dev_minor]; |
2230 | } | |
2231 | ||
5e5e007c | 2232 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
2233 | { |
2234 | struct pktcdvd_device *pd = NULL; | |
2235 | int ret; | |
2236 | ||
2a48fc0a | 2237 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2238 | mutex_lock(&ctl_mutex); |
5e5e007c | 2239 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
1da177e4 LT |
2240 | if (!pd) { |
2241 | ret = -ENODEV; | |
2242 | goto out; | |
2243 | } | |
2244 | BUG_ON(pd->refcnt < 0); | |
2245 | ||
2246 | pd->refcnt++; | |
46f4e1b7 | 2247 | if (pd->refcnt > 1) { |
5e5e007c | 2248 | if ((mode & FMODE_WRITE) && |
46f4e1b7 PO |
2249 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2250 | ret = -EBUSY; | |
2251 | goto out_dec; | |
2252 | } | |
2253 | } else { | |
5e5e007c | 2254 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
01fd9fda | 2255 | if (ret) |
1da177e4 | 2256 | goto out_dec; |
1da177e4 LT |
2257 | /* |
2258 | * needed here as well, since ext2 (among others) may change | |
2259 | * the blocksize at mount time | |
2260 | */ | |
5e5e007c | 2261 | set_blocksize(bdev, CD_FRAMESIZE); |
1da177e4 LT |
2262 | } |
2263 | ||
1657f824 | 2264 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2265 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2266 | return 0; |
2267 | ||
2268 | out_dec: | |
2269 | pd->refcnt--; | |
2270 | out: | |
1657f824 | 2271 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2272 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2273 | return ret; |
2274 | } | |
2275 | ||
db2a144b | 2276 | static void pkt_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2277 | { |
5e5e007c | 2278 | struct pktcdvd_device *pd = disk->private_data; |
1da177e4 | 2279 | |
2a48fc0a | 2280 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2281 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2282 | pd->refcnt--; |
2283 | BUG_ON(pd->refcnt < 0); | |
2284 | if (pd->refcnt == 0) { | |
2285 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2286 | pkt_release_dev(pd, flush); | |
2287 | } | |
1657f824 | 2288 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2289 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2290 | } |
2291 | ||
2292 | ||
4246a0b6 | 2293 | static void pkt_end_io_read_cloned(struct bio *bio) |
1da177e4 LT |
2294 | { |
2295 | struct packet_stacked_data *psd = bio->bi_private; | |
2296 | struct pktcdvd_device *pd = psd->pd; | |
2297 | ||
4e4cbee9 | 2298 | psd->bio->bi_status = bio->bi_status; |
1da177e4 | 2299 | bio_put(bio); |
4246a0b6 | 2300 | bio_endio(psd->bio); |
64c4bc4d | 2301 | mempool_free(psd, &psd_pool); |
1da177e4 | 2302 | pkt_bio_finished(pd); |
1da177e4 LT |
2303 | } |
2304 | ||
20d0189b | 2305 | static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 | 2306 | { |
64c4bc4d KO |
2307 | struct bio *cloned_bio = bio_clone_fast(bio, GFP_NOIO, &pkt_bio_set); |
2308 | struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO); | |
20d0189b KO |
2309 | |
2310 | psd->pd = pd; | |
2311 | psd->bio = bio; | |
74d46992 | 2312 | bio_set_dev(cloned_bio, pd->bdev); |
20d0189b KO |
2313 | cloned_bio->bi_private = psd; |
2314 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2315 | pd->stats.secs_r += bio_sectors(bio); | |
2316 | pkt_queue_bio(pd, cloned_bio); | |
2317 | } | |
2318 | ||
2319 | static void pkt_make_request_write(struct request_queue *q, struct bio *bio) | |
2320 | { | |
2321 | struct pktcdvd_device *pd = q->queuedata; | |
1da177e4 LT |
2322 | sector_t zone; |
2323 | struct packet_data *pkt; | |
2324 | int was_empty, blocked_bio; | |
2325 | struct pkt_rb_node *node; | |
2326 | ||
4f024f37 | 2327 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 LT |
2328 | |
2329 | /* | |
2330 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2331 | * just append this bio to that packet. | |
2332 | */ | |
2333 | spin_lock(&pd->cdrw.active_list_lock); | |
2334 | blocked_bio = 0; | |
2335 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2336 | if (pkt->sector == zone) { | |
2337 | spin_lock(&pkt->lock); | |
2338 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2339 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
c5ecc484 | 2340 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 KO |
2341 | pkt->write_size += |
2342 | bio->bi_iter.bi_size / CD_FRAMESIZE; | |
1da177e4 LT |
2343 | if ((pkt->write_size >= pkt->frames) && |
2344 | (pkt->state == PACKET_WAITING_STATE)) { | |
2345 | atomic_inc(&pkt->run_sm); | |
2346 | wake_up(&pd->wqueue); | |
2347 | } | |
2348 | spin_unlock(&pkt->lock); | |
2349 | spin_unlock(&pd->cdrw.active_list_lock); | |
5a7bbad2 | 2350 | return; |
1da177e4 LT |
2351 | } else { |
2352 | blocked_bio = 1; | |
2353 | } | |
2354 | spin_unlock(&pkt->lock); | |
2355 | } | |
2356 | } | |
2357 | spin_unlock(&pd->cdrw.active_list_lock); | |
2358 | ||
0a0fc960 TM |
2359 | /* |
2360 | * Test if there is enough room left in the bio work queue | |
2361 | * (queue size >= congestion on mark). | |
2362 | * If not, wait till the work queue size is below the congestion off mark. | |
2363 | */ | |
2364 | spin_lock(&pd->lock); | |
2365 | if (pd->write_congestion_on > 0 | |
2366 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
edb0872f | 2367 | set_bdi_congested(bio->bi_bdev->bd_disk->bdi, BLK_RW_ASYNC); |
0a0fc960 TM |
2368 | do { |
2369 | spin_unlock(&pd->lock); | |
8aa7e847 | 2370 | congestion_wait(BLK_RW_ASYNC, HZ); |
0a0fc960 TM |
2371 | spin_lock(&pd->lock); |
2372 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2373 | } | |
2374 | spin_unlock(&pd->lock); | |
2375 | ||
1da177e4 LT |
2376 | /* |
2377 | * No matching packet found. Store the bio in the work queue. | |
2378 | */ | |
64c4bc4d | 2379 | node = mempool_alloc(&pd->rb_pool, GFP_NOIO); |
1da177e4 LT |
2380 | node->bio = bio; |
2381 | spin_lock(&pd->lock); | |
2382 | BUG_ON(pd->bio_queue_size < 0); | |
2383 | was_empty = (pd->bio_queue_size == 0); | |
2384 | pkt_rbtree_insert(pd, node); | |
2385 | spin_unlock(&pd->lock); | |
2386 | ||
2387 | /* | |
2388 | * Wake up the worker thread. | |
2389 | */ | |
2390 | atomic_set(&pd->scan_queue, 1); | |
2391 | if (was_empty) { | |
2392 | /* This wake_up is required for correct operation */ | |
2393 | wake_up(&pd->wqueue); | |
2394 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2395 | /* | |
2396 | * This wake up is not required for correct operation, | |
2397 | * but improves performance in some cases. | |
2398 | */ | |
2399 | wake_up(&pd->wqueue); | |
2400 | } | |
20d0189b KO |
2401 | } |
2402 | ||
3e08773c | 2403 | static void pkt_submit_bio(struct bio *bio) |
20d0189b KO |
2404 | { |
2405 | struct pktcdvd_device *pd; | |
2406 | char b[BDEVNAME_SIZE]; | |
2407 | struct bio *split; | |
2408 | ||
f695ca38 | 2409 | blk_queue_split(&bio); |
54efd50b | 2410 | |
309dca30 | 2411 | pd = bio->bi_bdev->bd_disk->queue->queuedata; |
20d0189b | 2412 | if (!pd) { |
74d46992 | 2413 | pr_err("%s incorrect request queue\n", bio_devname(bio, b)); |
20d0189b KO |
2414 | goto end_io; |
2415 | } | |
2416 | ||
2417 | pkt_dbg(2, pd, "start = %6llx stop = %6llx\n", | |
2418 | (unsigned long long)bio->bi_iter.bi_sector, | |
2419 | (unsigned long long)bio_end_sector(bio)); | |
2420 | ||
2421 | /* | |
2422 | * Clone READ bios so we can have our own bi_end_io callback. | |
2423 | */ | |
2424 | if (bio_data_dir(bio) == READ) { | |
2425 | pkt_make_request_read(pd, bio); | |
3e08773c | 2426 | return; |
20d0189b KO |
2427 | } |
2428 | ||
2429 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2430 | pkt_notice(pd, "WRITE for ro device (%llu)\n", | |
2431 | (unsigned long long)bio->bi_iter.bi_sector); | |
2432 | goto end_io; | |
2433 | } | |
2434 | ||
2435 | if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) { | |
2436 | pkt_err(pd, "wrong bio size\n"); | |
2437 | goto end_io; | |
2438 | } | |
2439 | ||
20d0189b KO |
2440 | do { |
2441 | sector_t zone = get_zone(bio->bi_iter.bi_sector, pd); | |
2442 | sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd); | |
2443 | ||
2444 | if (last_zone != zone) { | |
2445 | BUG_ON(last_zone != zone + pd->settings.size); | |
2446 | ||
2447 | split = bio_split(bio, last_zone - | |
2448 | bio->bi_iter.bi_sector, | |
64c4bc4d | 2449 | GFP_NOIO, &pkt_bio_set); |
20d0189b KO |
2450 | bio_chain(split, bio); |
2451 | } else { | |
2452 | split = bio; | |
2453 | } | |
2454 | ||
309dca30 | 2455 | pkt_make_request_write(bio->bi_bdev->bd_disk->queue, split); |
20d0189b KO |
2456 | } while (split != bio); |
2457 | ||
3e08773c | 2458 | return; |
1da177e4 | 2459 | end_io: |
6712ecf8 | 2460 | bio_io_error(bio); |
1da177e4 LT |
2461 | } |
2462 | ||
1da177e4 LT |
2463 | static void pkt_init_queue(struct pktcdvd_device *pd) |
2464 | { | |
165125e1 | 2465 | struct request_queue *q = pd->disk->queue; |
1da177e4 | 2466 | |
e1defc4f | 2467 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
086fa5ff | 2468 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
1da177e4 LT |
2469 | q->queuedata = pd; |
2470 | } | |
2471 | ||
2472 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2473 | { | |
2474 | struct pktcdvd_device *pd = m->private; | |
2475 | char *msg; | |
2476 | char bdev_buf[BDEVNAME_SIZE]; | |
2477 | int states[PACKET_NUM_STATES]; | |
2478 | ||
2479 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2480 | bdevname(pd->bdev, bdev_buf)); | |
2481 | ||
2482 | seq_printf(m, "\nSettings:\n"); | |
2483 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2484 | ||
2485 | if (pd->settings.write_type == 0) | |
2486 | msg = "Packet"; | |
2487 | else | |
2488 | msg = "Unknown"; | |
2489 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2490 | ||
2491 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2492 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2493 | ||
2494 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2495 | ||
2496 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2497 | msg = "Mode 1"; | |
2498 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2499 | msg = "Mode 2"; | |
2500 | else | |
2501 | msg = "Unknown"; | |
2502 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2503 | ||
2504 | seq_printf(m, "\nStatistics:\n"); | |
2505 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2506 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2507 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2508 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2509 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2510 | ||
2511 | seq_printf(m, "\nMisc:\n"); | |
2512 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2513 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2514 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2515 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2516 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2517 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2518 | ||
2519 | seq_printf(m, "\nQueue state:\n"); | |
2520 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2521 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2522 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2523 | ||
2524 | pkt_count_states(pd, states); | |
2525 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2526 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2527 | ||
0a0fc960 TM |
2528 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2529 | pd->write_congestion_off, | |
2530 | pd->write_congestion_on); | |
1da177e4 LT |
2531 | return 0; |
2532 | } | |
2533 | ||
1da177e4 LT |
2534 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
2535 | { | |
2536 | int i; | |
1da177e4 | 2537 | char b[BDEVNAME_SIZE]; |
1da177e4 | 2538 | struct block_device *bdev; |
4845012e | 2539 | struct scsi_device *sdev; |
1da177e4 LT |
2540 | |
2541 | if (pd->pkt_dev == dev) { | |
fa63c0ab | 2542 | pkt_err(pd, "recursive setup not allowed\n"); |
1da177e4 LT |
2543 | return -EBUSY; |
2544 | } | |
2545 | for (i = 0; i < MAX_WRITERS; i++) { | |
2546 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2547 | if (!pd2) | |
2548 | continue; | |
2549 | if (pd2->bdev->bd_dev == dev) { | |
fa63c0ab JP |
2550 | pkt_err(pd, "%s already setup\n", |
2551 | bdevname(pd2->bdev, b)); | |
1da177e4 LT |
2552 | return -EBUSY; |
2553 | } | |
2554 | if (pd2->pkt_dev == dev) { | |
fa63c0ab | 2555 | pkt_err(pd, "can't chain pktcdvd devices\n"); |
1da177e4 LT |
2556 | return -EBUSY; |
2557 | } | |
2558 | } | |
2559 | ||
b8d95484 CH |
2560 | bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_NDELAY, NULL); |
2561 | if (IS_ERR(bdev)) | |
2562 | return PTR_ERR(bdev); | |
4845012e CH |
2563 | sdev = scsi_device_from_queue(bdev->bd_disk->queue); |
2564 | if (!sdev) { | |
882d4171 | 2565 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
ec2be6a9 BVA |
2566 | return -EINVAL; |
2567 | } | |
4845012e | 2568 | put_device(&sdev->sdev_gendev); |
1da177e4 LT |
2569 | |
2570 | /* This is safe, since we have a reference from open(). */ | |
2571 | __module_get(THIS_MODULE); | |
2572 | ||
1da177e4 LT |
2573 | pd->bdev = bdev; |
2574 | set_blocksize(bdev, CD_FRAMESIZE); | |
2575 | ||
2576 | pkt_init_queue(pd); | |
2577 | ||
2578 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2579 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2580 | if (IS_ERR(pd->cdrw.thread)) { | |
fa63c0ab | 2581 | pkt_err(pd, "can't start kernel thread\n"); |
e1bc89bc | 2582 | goto out_mem; |
1da177e4 LT |
2583 | } |
2584 | ||
3f3942ac | 2585 | proc_create_single_data(pd->name, 0, pkt_proc, pkt_seq_show, pd); |
844aa797 | 2586 | pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b)); |
1da177e4 LT |
2587 | return 0; |
2588 | ||
1da177e4 | 2589 | out_mem: |
2cbed890 | 2590 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 LT |
2591 | /* This is safe: open() is still holding a reference. */ |
2592 | module_put(THIS_MODULE); | |
b8d95484 | 2593 | return -ENOMEM; |
1da177e4 LT |
2594 | } |
2595 | ||
5e5e007c | 2596 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
1da177e4 | 2597 | { |
5e5e007c | 2598 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
8a6cfeb6 | 2599 | int ret; |
1da177e4 | 2600 | |
844aa797 | 2601 | pkt_dbg(2, pd, "cmd %x, dev %d:%d\n", |
cd3f2cd0 | 2602 | cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
1da177e4 | 2603 | |
2a48fc0a | 2604 | mutex_lock(&pktcdvd_mutex); |
1da177e4 | 2605 | switch (cmd) { |
a0eb62a0 AV |
2606 | case CDROMEJECT: |
2607 | /* | |
2608 | * The door gets locked when the device is opened, so we | |
2609 | * have to unlock it or else the eject command fails. | |
2610 | */ | |
2611 | if (pd->refcnt == 1) | |
2612 | pkt_lock_door(pd, 0); | |
df561f66 | 2613 | fallthrough; |
1da177e4 LT |
2614 | /* |
2615 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2616 | */ | |
2617 | case CDROMMULTISESSION: | |
2618 | case CDROMREADTOCENTRY: | |
2619 | case CDROM_LAST_WRITTEN: | |
2620 | case CDROM_SEND_PACKET: | |
2621 | case SCSI_IOCTL_SEND_COMMAND: | |
a7cb3d2f CH |
2622 | if (!bdev->bd_disk->fops->ioctl) |
2623 | ret = -ENOTTY; | |
2624 | else | |
2625 | ret = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); | |
8a6cfeb6 | 2626 | break; |
1da177e4 | 2627 | default: |
844aa797 | 2628 | pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd); |
8a6cfeb6 | 2629 | ret = -ENOTTY; |
1da177e4 | 2630 | } |
2a48fc0a | 2631 | mutex_unlock(&pktcdvd_mutex); |
8560c650 | 2632 | |
8a6cfeb6 | 2633 | return ret; |
1da177e4 LT |
2634 | } |
2635 | ||
3c0d2060 TH |
2636 | static unsigned int pkt_check_events(struct gendisk *disk, |
2637 | unsigned int clearing) | |
1da177e4 LT |
2638 | { |
2639 | struct pktcdvd_device *pd = disk->private_data; | |
2640 | struct gendisk *attached_disk; | |
2641 | ||
2642 | if (!pd) | |
2643 | return 0; | |
2644 | if (!pd->bdev) | |
2645 | return 0; | |
2646 | attached_disk = pd->bdev->bd_disk; | |
3c0d2060 | 2647 | if (!attached_disk || !attached_disk->fops->check_events) |
1da177e4 | 2648 | return 0; |
3c0d2060 | 2649 | return attached_disk->fops->check_events(attached_disk, clearing); |
1da177e4 LT |
2650 | } |
2651 | ||
348e114b CH |
2652 | static char *pkt_devnode(struct gendisk *disk, umode_t *mode) |
2653 | { | |
2654 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name); | |
2655 | } | |
2656 | ||
83d5cde4 | 2657 | static const struct block_device_operations pktcdvd_ops = { |
1da177e4 | 2658 | .owner = THIS_MODULE, |
c62b37d9 | 2659 | .submit_bio = pkt_submit_bio, |
5e5e007c AV |
2660 | .open = pkt_open, |
2661 | .release = pkt_close, | |
8a6cfeb6 | 2662 | .ioctl = pkt_ioctl, |
ab8bc541 | 2663 | .compat_ioctl = blkdev_compat_ptr_ioctl, |
3c0d2060 | 2664 | .check_events = pkt_check_events, |
348e114b | 2665 | .devnode = pkt_devnode, |
1da177e4 LT |
2666 | }; |
2667 | ||
2668 | /* | |
2669 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2670 | */ | |
adb9250a | 2671 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2672 | { |
2673 | int idx; | |
2674 | int ret = -ENOMEM; | |
2675 | struct pktcdvd_device *pd; | |
2676 | struct gendisk *disk; | |
adb9250a TM |
2677 | |
2678 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2679 | |
2680 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2681 | if (!pkt_devs[idx]) | |
2682 | break; | |
2683 | if (idx == MAX_WRITERS) { | |
99481334 | 2684 | pr_err("max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2685 | ret = -EBUSY; |
2686 | goto out_mutex; | |
1da177e4 LT |
2687 | } |
2688 | ||
1107d2e0 | 2689 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2690 | if (!pd) |
adb9250a | 2691 | goto out_mutex; |
1da177e4 | 2692 | |
64c4bc4d KO |
2693 | ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE, |
2694 | sizeof(struct pkt_rb_node)); | |
2695 | if (ret) | |
1da177e4 LT |
2696 | goto out_mem; |
2697 | ||
e1bc89bc PO |
2698 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2699 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2700 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2701 | ||
1da177e4 LT |
2702 | spin_lock_init(&pd->lock); |
2703 | spin_lock_init(&pd->iosched.lock); | |
c5ecc484 AM |
2704 | bio_list_init(&pd->iosched.read_queue); |
2705 | bio_list_init(&pd->iosched.write_queue); | |
7822082d | 2706 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2707 | init_waitqueue_head(&pd->wqueue); |
2708 | pd->bio_queue = RB_ROOT; | |
2709 | ||
0a0fc960 TM |
2710 | pd->write_congestion_on = write_congestion_on; |
2711 | pd->write_congestion_off = write_congestion_off; | |
2712 | ||
566484a9 | 2713 | ret = -ENOMEM; |
44413484 | 2714 | disk = blk_alloc_disk(NUMA_NO_NODE); |
adb9250a TM |
2715 | if (!disk) |
2716 | goto out_mem; | |
2717 | pd->disk = disk; | |
add21660 | 2718 | disk->major = pktdev_major; |
1da177e4 | 2719 | disk->first_minor = idx; |
44413484 | 2720 | disk->minors = 1; |
1da177e4 LT |
2721 | disk->fops = &pktcdvd_ops; |
2722 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2723 | strcpy(disk->disk_name, pd->name); |
1da177e4 | 2724 | disk->private_data = pd; |
1da177e4 | 2725 | |
f331c029 | 2726 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2727 | ret = pkt_new_dev(pd, dev); |
2728 | if (ret) | |
5a0ec388 | 2729 | goto out_mem2; |
1da177e4 | 2730 | |
3c0d2060 TH |
2731 | /* inherit events of the host device */ |
2732 | disk->events = pd->bdev->bd_disk->events; | |
3c0d2060 | 2733 | |
7b505627 LC |
2734 | ret = add_disk(disk); |
2735 | if (ret) | |
2736 | goto out_mem2; | |
adb9250a | 2737 | |
32694850 TM |
2738 | pkt_sysfs_dev_new(pd); |
2739 | pkt_debugfs_dev_new(pd); | |
2740 | ||
1da177e4 | 2741 | pkt_devs[idx] = pd; |
adb9250a TM |
2742 | if (pkt_dev) |
2743 | *pkt_dev = pd->pkt_dev; | |
2744 | ||
2745 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2746 | return 0; |
2747 | ||
1da177e4 | 2748 | out_mem2: |
44413484 | 2749 | blk_cleanup_disk(disk); |
1da177e4 | 2750 | out_mem: |
64c4bc4d | 2751 | mempool_exit(&pd->rb_pool); |
1da177e4 | 2752 | kfree(pd); |
adb9250a TM |
2753 | out_mutex: |
2754 | mutex_unlock(&ctl_mutex); | |
99481334 | 2755 | pr_err("setup of pktcdvd device failed\n"); |
1da177e4 LT |
2756 | return ret; |
2757 | } | |
2758 | ||
2759 | /* | |
2760 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2761 | */ | |
adb9250a | 2762 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2763 | { |
2764 | struct pktcdvd_device *pd; | |
2765 | int idx; | |
adb9250a TM |
2766 | int ret = 0; |
2767 | ||
2768 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2769 | |
2770 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2771 | pd = pkt_devs[idx]; | |
2772 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2773 | break; | |
2774 | } | |
2775 | if (idx == MAX_WRITERS) { | |
666dc7c9 | 2776 | pr_debug("dev not setup\n"); |
adb9250a TM |
2777 | ret = -ENXIO; |
2778 | goto out; | |
1da177e4 LT |
2779 | } |
2780 | ||
adb9250a TM |
2781 | if (pd->refcnt > 0) { |
2782 | ret = -EBUSY; | |
2783 | goto out; | |
2784 | } | |
1da177e4 LT |
2785 | if (!IS_ERR(pd->cdrw.thread)) |
2786 | kthread_stop(pd->cdrw.thread); | |
2787 | ||
32694850 TM |
2788 | pkt_devs[idx] = NULL; |
2789 | ||
2790 | pkt_debugfs_dev_remove(pd); | |
2791 | pkt_sysfs_dev_remove(pd); | |
2792 | ||
2cbed890 | 2793 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 | 2794 | |
1da177e4 | 2795 | remove_proc_entry(pd->name, pkt_proc); |
844aa797 | 2796 | pkt_dbg(1, pd, "writer unmapped\n"); |
1da177e4 LT |
2797 | |
2798 | del_gendisk(pd->disk); | |
44413484 | 2799 | blk_cleanup_disk(pd->disk); |
1da177e4 | 2800 | |
64c4bc4d | 2801 | mempool_exit(&pd->rb_pool); |
1da177e4 LT |
2802 | kfree(pd); |
2803 | ||
2804 | /* This is safe: open() is still holding a reference. */ | |
2805 | module_put(THIS_MODULE); | |
adb9250a TM |
2806 | |
2807 | out: | |
2808 | mutex_unlock(&ctl_mutex); | |
2809 | return ret; | |
1da177e4 LT |
2810 | } |
2811 | ||
2812 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2813 | { | |
adb9250a TM |
2814 | struct pktcdvd_device *pd; |
2815 | ||
2816 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2817 | ||
2818 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2819 | if (pd) { |
2820 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2821 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2822 | } else { | |
2823 | ctrl_cmd->dev = 0; | |
2824 | ctrl_cmd->pkt_dev = 0; | |
2825 | } | |
2826 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2827 | |
2828 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2829 | } |
2830 | ||
f80a0ca6 | 2831 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
2832 | { |
2833 | void __user *argp = (void __user *)arg; | |
2834 | struct pkt_ctrl_command ctrl_cmd; | |
2835 | int ret = 0; | |
adb9250a | 2836 | dev_t pkt_dev = 0; |
1da177e4 LT |
2837 | |
2838 | if (cmd != PACKET_CTRL_CMD) | |
2839 | return -ENOTTY; | |
2840 | ||
2841 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2842 | return -EFAULT; | |
2843 | ||
2844 | switch (ctrl_cmd.command) { | |
2845 | case PKT_CTRL_CMD_SETUP: | |
2846 | if (!capable(CAP_SYS_ADMIN)) | |
2847 | return -EPERM; | |
adb9250a TM |
2848 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
2849 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
2850 | break; |
2851 | case PKT_CTRL_CMD_TEARDOWN: | |
2852 | if (!capable(CAP_SYS_ADMIN)) | |
2853 | return -EPERM; | |
adb9250a | 2854 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
2855 | break; |
2856 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 2857 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
2858 | break; |
2859 | default: | |
2860 | return -ENOTTY; | |
2861 | } | |
2862 | ||
2863 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2864 | return -EFAULT; | |
2865 | return ret; | |
2866 | } | |
2867 | ||
f80a0ca6 AB |
2868 | #ifdef CONFIG_COMPAT |
2869 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2870 | { | |
2871 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
2872 | } | |
2873 | #endif | |
1da177e4 | 2874 | |
2b8693c0 | 2875 | static const struct file_operations pkt_ctl_fops = { |
f80a0ca6 AB |
2876 | .open = nonseekable_open, |
2877 | .unlocked_ioctl = pkt_ctl_ioctl, | |
2878 | #ifdef CONFIG_COMPAT | |
2879 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
2880 | #endif | |
2881 | .owner = THIS_MODULE, | |
6038f373 | 2882 | .llseek = no_llseek, |
1da177e4 LT |
2883 | }; |
2884 | ||
2885 | static struct miscdevice pkt_misc = { | |
2886 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 2887 | .name = DRIVER_NAME, |
e454cea2 | 2888 | .nodename = "pktcdvd/control", |
1da177e4 LT |
2889 | .fops = &pkt_ctl_fops |
2890 | }; | |
2891 | ||
2892 | static int __init pkt_init(void) | |
2893 | { | |
2894 | int ret; | |
2895 | ||
32694850 TM |
2896 | mutex_init(&ctl_mutex); |
2897 | ||
64c4bc4d KO |
2898 | ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE, |
2899 | sizeof(struct packet_stacked_data)); | |
2900 | if (ret) | |
2901 | return ret; | |
2902 | ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0); | |
2903 | if (ret) { | |
2904 | mempool_exit(&psd_pool); | |
2905 | return ret; | |
a1d91404 | 2906 | } |
1da177e4 | 2907 | |
add21660 | 2908 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2909 | if (ret < 0) { |
99481334 | 2910 | pr_err("unable to register block device\n"); |
1da177e4 LT |
2911 | goto out2; |
2912 | } | |
add21660 TM |
2913 | if (!pktdev_major) |
2914 | pktdev_major = ret; | |
1da177e4 | 2915 | |
32694850 TM |
2916 | ret = pkt_sysfs_init(); |
2917 | if (ret) | |
2918 | goto out; | |
2919 | ||
2920 | pkt_debugfs_init(); | |
2921 | ||
1da177e4 LT |
2922 | ret = misc_register(&pkt_misc); |
2923 | if (ret) { | |
99481334 | 2924 | pr_err("unable to register misc device\n"); |
32694850 | 2925 | goto out_misc; |
1da177e4 LT |
2926 | } |
2927 | ||
928b4d8c | 2928 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2929 | |
1da177e4 LT |
2930 | return 0; |
2931 | ||
32694850 TM |
2932 | out_misc: |
2933 | pkt_debugfs_cleanup(); | |
2934 | pkt_sysfs_cleanup(); | |
1da177e4 | 2935 | out: |
add21660 | 2936 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2937 | out2: |
64c4bc4d KO |
2938 | mempool_exit(&psd_pool); |
2939 | bioset_exit(&pkt_bio_set); | |
1da177e4 LT |
2940 | return ret; |
2941 | } | |
2942 | ||
2943 | static void __exit pkt_exit(void) | |
2944 | { | |
928b4d8c | 2945 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2946 | misc_deregister(&pkt_misc); |
32694850 TM |
2947 | |
2948 | pkt_debugfs_cleanup(); | |
2949 | pkt_sysfs_cleanup(); | |
2950 | ||
add21660 | 2951 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
64c4bc4d KO |
2952 | mempool_exit(&psd_pool); |
2953 | bioset_exit(&pkt_bio_set); | |
1da177e4 LT |
2954 | } |
2955 | ||
2956 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
2957 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
2958 | MODULE_LICENSE("GPL"); | |
2959 | ||
2960 | module_init(pkt_init); | |
2961 | module_exit(pkt_exit); |