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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
adb9250a | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
1da177e4 LT |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
a676f8d0 PO |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. | |
1da177e4 LT |
11 | * |
12 | * Theory of operation: | |
13 | * | |
a676f8d0 PO |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
15 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, | |
16 | * but it doesn't know anything about the special restrictions that apply to | |
17 | * packet writing. One restriction is that write requests must be aligned to | |
18 | * packet boundaries on the physical media, and the size of a write request | |
19 | * must be equal to the packet size. Another restriction is that a | |
20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read | |
21 | * command, if the previous command was a write. | |
22 | * | |
23 | * The purpose of the packet writing driver is to hide these restrictions from | |
24 | * higher layers, such as file systems, and present a block device that can be | |
25 | * randomly read and written using 2kB-sized blocks. | |
26 | * | |
27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. | |
28 | * Its data is defined by the struct packet_iosched and includes two bio | |
29 | * queues with pending read and write requests. These queues are processed | |
30 | * by the pkt_iosched_process_queue() function. The write requests in this | |
31 | * queue are already properly aligned and sized. This layer is responsible for | |
32 | * issuing the flush cache commands and scheduling the I/O in a good order. | |
33 | * | |
34 | * The next layer transforms unaligned write requests to aligned writes. This | |
35 | * transformation requires reading missing pieces of data from the underlying | |
36 | * block device, assembling the pieces to full packets and queuing them to the | |
37 | * packet I/O scheduler. | |
38 | * | |
39 | * At the top layer there is a custom make_request_fn function that forwards | |
40 | * read requests directly to the iosched queue and puts write requests in the | |
41 | * unaligned write queue. A kernel thread performs the necessary read | |
42 | * gathering to convert the unaligned writes to aligned writes and then feeds | |
43 | * them to the packet I/O scheduler. | |
1da177e4 LT |
44 | * |
45 | *************************************************************************/ | |
46 | ||
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> |
1da177e4 LT |
64 | #include <scsi/scsi_cmnd.h> |
65 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 66 | #include <scsi/scsi.h> |
32694850 TM |
67 | #include <linux/debugfs.h> |
68 | #include <linux/device.h> | |
1da177e4 LT |
69 | |
70 | #include <asm/uaccess.h> | |
71 | ||
7822082d TM |
72 | #define DRIVER_NAME "pktcdvd" |
73 | ||
fa63c0ab JP |
74 | #define pkt_err(pd, fmt, ...) \ |
75 | pr_err("%s: " fmt, pd->name, ##__VA_ARGS__) | |
ca73dabc JP |
76 | #define pkt_notice(pd, fmt, ...) \ |
77 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__) | |
0c075d64 JP |
78 | #define pkt_info(pd, fmt, ...) \ |
79 | pr_info("%s: " fmt, pd->name, ##__VA_ARGS__) | |
fa63c0ab | 80 | |
844aa797 JP |
81 | #define pkt_dbg(level, pd, fmt, ...) \ |
82 | do { \ | |
83 | if (level == 2 && PACKET_DEBUG >= 2) \ | |
84 | pr_notice("%s: %s():" fmt, \ | |
85 | pd->name, __func__, ##__VA_ARGS__); \ | |
86 | else if (level == 1 && PACKET_DEBUG >= 1) \ | |
87 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \ | |
cd3f2cd0 | 88 | } while (0) |
1da177e4 LT |
89 | |
90 | #define MAX_SPEED 0xffff | |
91 | ||
2a48fc0a | 92 | static DEFINE_MUTEX(pktcdvd_mutex); |
1da177e4 LT |
93 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
94 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 95 | static int pktdev_major; |
0a0fc960 TM |
96 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
97 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 98 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
99 | static mempool_t *psd_pool; |
100 | ||
32694850 | 101 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
ea5ffff5 | 102 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
32694850 TM |
103 | |
104 | /* forward declaration */ | |
105 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
106 | static int pkt_remove_dev(dev_t pkt_dev); | |
107 | static int pkt_seq_show(struct seq_file *m, void *p); | |
108 | ||
5323fb77 JP |
109 | static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd) |
110 | { | |
111 | return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1); | |
112 | } | |
32694850 TM |
113 | |
114 | /* | |
115 | * create and register a pktcdvd kernel object. | |
116 | */ | |
117 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
118 | const char* name, | |
119 | struct kobject* parent, | |
120 | struct kobj_type* ktype) | |
121 | { | |
122 | struct pktcdvd_kobj *p; | |
89c42606 GKH |
123 | int error; |
124 | ||
32694850 TM |
125 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
126 | if (!p) | |
127 | return NULL; | |
32694850 | 128 | p->pd = pd; |
89c42606 GKH |
129 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
130 | if (error) { | |
d17a18dd | 131 | kobject_put(&p->kobj); |
32694850 | 132 | return NULL; |
d17a18dd | 133 | } |
89c42606 | 134 | kobject_uevent(&p->kobj, KOBJ_ADD); |
32694850 TM |
135 | return p; |
136 | } | |
137 | /* | |
138 | * remove a pktcdvd kernel object. | |
139 | */ | |
140 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
141 | { | |
142 | if (p) | |
c10997f6 | 143 | kobject_put(&p->kobj); |
32694850 TM |
144 | } |
145 | /* | |
146 | * default release function for pktcdvd kernel objects. | |
147 | */ | |
148 | static void pkt_kobj_release(struct kobject *kobj) | |
149 | { | |
150 | kfree(to_pktcdvdkobj(kobj)); | |
151 | } | |
152 | ||
153 | ||
154 | /********************************************************** | |
155 | * | |
156 | * sysfs interface for pktcdvd | |
157 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
158 | * | |
159 | **********************************************************/ | |
160 | ||
161 | #define DEF_ATTR(_obj,_name,_mode) \ | |
7b595756 | 162 | static struct attribute _obj = { .name = _name, .mode = _mode } |
32694850 TM |
163 | |
164 | /********************************************************** | |
165 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
166 | stat/reset | |
167 | stat/packets_started | |
168 | stat/packets_finished | |
169 | stat/kb_written | |
170 | stat/kb_read | |
171 | stat/kb_read_gather | |
172 | write_queue/size | |
173 | write_queue/congestion_off | |
174 | write_queue/congestion_on | |
175 | **********************************************************/ | |
176 | ||
177 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
178 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
179 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
180 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
181 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
182 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
183 | ||
184 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
185 | &kobj_pkt_attr_st1, | |
186 | &kobj_pkt_attr_st2, | |
187 | &kobj_pkt_attr_st3, | |
188 | &kobj_pkt_attr_st4, | |
189 | &kobj_pkt_attr_st5, | |
190 | &kobj_pkt_attr_st6, | |
191 | NULL | |
192 | }; | |
193 | ||
194 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
195 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
196 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
197 | ||
198 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
199 | &kobj_pkt_attr_wq1, | |
200 | &kobj_pkt_attr_wq2, | |
201 | &kobj_pkt_attr_wq3, | |
202 | NULL | |
203 | }; | |
204 | ||
32694850 TM |
205 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
206 | struct attribute *attr, char *data) | |
207 | { | |
208 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
209 | int n = 0; | |
210 | int v; | |
211 | if (strcmp(attr->name, "packets_started") == 0) { | |
212 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
213 | ||
214 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
215 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
216 | ||
217 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
218 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
219 | ||
220 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
221 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
222 | ||
223 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
224 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
225 | ||
226 | } else if (strcmp(attr->name, "size") == 0) { | |
227 | spin_lock(&pd->lock); | |
228 | v = pd->bio_queue_size; | |
229 | spin_unlock(&pd->lock); | |
230 | n = sprintf(data, "%d\n", v); | |
231 | ||
232 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
233 | spin_lock(&pd->lock); | |
234 | v = pd->write_congestion_off; | |
235 | spin_unlock(&pd->lock); | |
236 | n = sprintf(data, "%d\n", v); | |
237 | ||
238 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
239 | spin_lock(&pd->lock); | |
240 | v = pd->write_congestion_on; | |
241 | spin_unlock(&pd->lock); | |
242 | n = sprintf(data, "%d\n", v); | |
243 | } | |
244 | return n; | |
245 | } | |
246 | ||
247 | static void init_write_congestion_marks(int* lo, int* hi) | |
248 | { | |
249 | if (*hi > 0) { | |
250 | *hi = max(*hi, 500); | |
251 | *hi = min(*hi, 1000000); | |
252 | if (*lo <= 0) | |
253 | *lo = *hi - 100; | |
254 | else { | |
255 | *lo = min(*lo, *hi - 100); | |
256 | *lo = max(*lo, 100); | |
257 | } | |
258 | } else { | |
259 | *hi = -1; | |
260 | *lo = -1; | |
261 | } | |
262 | } | |
263 | ||
264 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
265 | struct attribute *attr, | |
266 | const char *data, size_t len) | |
267 | { | |
268 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
269 | int val; | |
32694850 | 270 | |
83f3aa3d | 271 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
32694850 TM |
272 | pd->stats.pkt_started = 0; |
273 | pd->stats.pkt_ended = 0; | |
274 | pd->stats.secs_w = 0; | |
275 | pd->stats.secs_rg = 0; | |
276 | pd->stats.secs_r = 0; | |
277 | ||
278 | } else if (strcmp(attr->name, "congestion_off") == 0 | |
83f3aa3d | 279 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
280 | spin_lock(&pd->lock); |
281 | pd->write_congestion_off = val; | |
282 | init_write_congestion_marks(&pd->write_congestion_off, | |
283 | &pd->write_congestion_on); | |
284 | spin_unlock(&pd->lock); | |
285 | ||
286 | } else if (strcmp(attr->name, "congestion_on") == 0 | |
83f3aa3d | 287 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
288 | spin_lock(&pd->lock); |
289 | pd->write_congestion_on = val; | |
290 | init_write_congestion_marks(&pd->write_congestion_off, | |
291 | &pd->write_congestion_on); | |
292 | spin_unlock(&pd->lock); | |
293 | } | |
294 | return len; | |
295 | } | |
296 | ||
52cf25d0 | 297 | static const struct sysfs_ops kobj_pkt_ops = { |
32694850 TM |
298 | .show = kobj_pkt_show, |
299 | .store = kobj_pkt_store | |
300 | }; | |
301 | static struct kobj_type kobj_pkt_type_stat = { | |
302 | .release = pkt_kobj_release, | |
303 | .sysfs_ops = &kobj_pkt_ops, | |
304 | .default_attrs = kobj_pkt_attrs_stat | |
305 | }; | |
306 | static struct kobj_type kobj_pkt_type_wqueue = { | |
307 | .release = pkt_kobj_release, | |
308 | .sysfs_ops = &kobj_pkt_ops, | |
309 | .default_attrs = kobj_pkt_attrs_wqueue | |
310 | }; | |
311 | ||
312 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
313 | { | |
314 | if (class_pktcdvd) { | |
cba76717 | 315 | pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
1ff9f542 | 316 | "%s", pd->name); |
6013c12b TJ |
317 | if (IS_ERR(pd->dev)) |
318 | pd->dev = NULL; | |
32694850 | 319 | } |
6013c12b | 320 | if (pd->dev) { |
32694850 | 321 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
6013c12b | 322 | &pd->dev->kobj, |
32694850 TM |
323 | &kobj_pkt_type_stat); |
324 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
6013c12b | 325 | &pd->dev->kobj, |
32694850 TM |
326 | &kobj_pkt_type_wqueue); |
327 | } | |
328 | } | |
329 | ||
330 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
331 | { | |
332 | pkt_kobj_remove(pd->kobj_stat); | |
333 | pkt_kobj_remove(pd->kobj_wqueue); | |
334 | if (class_pktcdvd) | |
ca0bf64d | 335 | device_unregister(pd->dev); |
32694850 TM |
336 | } |
337 | ||
338 | ||
339 | /******************************************************************** | |
340 | /sys/class/pktcdvd/ | |
341 | add map block device | |
342 | remove unmap packet dev | |
343 | device_map show mappings | |
344 | *******************************************************************/ | |
345 | ||
346 | static void class_pktcdvd_release(struct class *cls) | |
347 | { | |
348 | kfree(cls); | |
349 | } | |
28812fe1 AK |
350 | static ssize_t class_pktcdvd_show_map(struct class *c, |
351 | struct class_attribute *attr, | |
352 | char *data) | |
32694850 TM |
353 | { |
354 | int n = 0; | |
355 | int idx; | |
356 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
357 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
358 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
359 | if (!pd) | |
360 | continue; | |
361 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
362 | pd->name, | |
363 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
364 | MAJOR(pd->bdev->bd_dev), | |
365 | MINOR(pd->bdev->bd_dev)); | |
366 | } | |
367 | mutex_unlock(&ctl_mutex); | |
368 | return n; | |
369 | } | |
370 | ||
28812fe1 AK |
371 | static ssize_t class_pktcdvd_store_add(struct class *c, |
372 | struct class_attribute *attr, | |
373 | const char *buf, | |
32694850 TM |
374 | size_t count) |
375 | { | |
376 | unsigned int major, minor; | |
fffe487d | 377 | |
83f3aa3d | 378 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
fffe487d TH |
379 | /* pkt_setup_dev() expects caller to hold reference to self */ |
380 | if (!try_module_get(THIS_MODULE)) | |
381 | return -ENODEV; | |
382 | ||
32694850 | 383 | pkt_setup_dev(MKDEV(major, minor), NULL); |
fffe487d TH |
384 | |
385 | module_put(THIS_MODULE); | |
386 | ||
32694850 TM |
387 | return count; |
388 | } | |
fffe487d | 389 | |
32694850 TM |
390 | return -EINVAL; |
391 | } | |
392 | ||
28812fe1 AK |
393 | static ssize_t class_pktcdvd_store_remove(struct class *c, |
394 | struct class_attribute *attr, | |
395 | const char *buf, | |
32694850 TM |
396 | size_t count) |
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 | } | |
405 | ||
406 | static struct class_attribute class_pktcdvd_attrs[] = { | |
407 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
408 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
409 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
410 | __ATTR_NULL | |
411 | }; | |
412 | ||
413 | ||
414 | static int pkt_sysfs_init(void) | |
415 | { | |
416 | int ret = 0; | |
417 | ||
418 | /* | |
419 | * create control files in sysfs | |
420 | * /sys/class/pktcdvd/... | |
421 | */ | |
422 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
423 | if (!class_pktcdvd) | |
424 | return -ENOMEM; | |
425 | class_pktcdvd->name = DRIVER_NAME; | |
426 | class_pktcdvd->owner = THIS_MODULE; | |
427 | class_pktcdvd->class_release = class_pktcdvd_release; | |
428 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
429 | ret = class_register(class_pktcdvd); | |
430 | if (ret) { | |
431 | kfree(class_pktcdvd); | |
432 | class_pktcdvd = NULL; | |
99481334 | 433 | pr_err("failed to create class pktcdvd\n"); |
32694850 TM |
434 | return ret; |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static void pkt_sysfs_cleanup(void) | |
440 | { | |
441 | if (class_pktcdvd) | |
442 | class_destroy(class_pktcdvd); | |
443 | class_pktcdvd = NULL; | |
444 | } | |
445 | ||
446 | /******************************************************************** | |
447 | entries in debugfs | |
448 | ||
156f5a78 | 449 | /sys/kernel/debug/pktcdvd[0-7]/ |
32694850 TM |
450 | info |
451 | ||
452 | *******************************************************************/ | |
453 | ||
454 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
455 | { | |
456 | return pkt_seq_show(m, p); | |
457 | } | |
458 | ||
459 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
460 | { | |
461 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
462 | } | |
463 | ||
2b8693c0 | 464 | static const struct file_operations debug_fops = { |
32694850 TM |
465 | .open = pkt_debugfs_fops_open, |
466 | .read = seq_read, | |
467 | .llseek = seq_lseek, | |
468 | .release = single_release, | |
469 | .owner = THIS_MODULE, | |
470 | }; | |
471 | ||
472 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
473 | { | |
474 | if (!pkt_debugfs_root) | |
475 | return; | |
32694850 | 476 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); |
49c2856a | 477 | if (!pd->dfs_d_root) |
32694850 | 478 | return; |
49c2856a | 479 | |
32694850 TM |
480 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, |
481 | pd->dfs_d_root, pd, &debug_fops); | |
32694850 TM |
482 | } |
483 | ||
484 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
485 | { | |
486 | if (!pkt_debugfs_root) | |
487 | return; | |
49c2856a DC |
488 | debugfs_remove(pd->dfs_f_info); |
489 | debugfs_remove(pd->dfs_d_root); | |
32694850 | 490 | pd->dfs_f_info = NULL; |
32694850 TM |
491 | pd->dfs_d_root = NULL; |
492 | } | |
493 | ||
494 | static void pkt_debugfs_init(void) | |
495 | { | |
496 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
32694850 TM |
497 | } |
498 | ||
499 | static void pkt_debugfs_cleanup(void) | |
500 | { | |
32694850 TM |
501 | debugfs_remove(pkt_debugfs_root); |
502 | pkt_debugfs_root = NULL; | |
503 | } | |
504 | ||
505 | /* ----------------------------------------------------------*/ | |
506 | ||
1da177e4 LT |
507 | |
508 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
509 | { | |
510 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
511 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
844aa797 | 512 | pkt_dbg(2, pd, "queue empty\n"); |
1da177e4 LT |
513 | atomic_set(&pd->iosched.attention, 1); |
514 | wake_up(&pd->wqueue); | |
515 | } | |
516 | } | |
517 | ||
1da177e4 LT |
518 | /* |
519 | * Allocate a packet_data struct | |
520 | */ | |
e1bc89bc | 521 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
522 | { |
523 | int i; | |
524 | struct packet_data *pkt; | |
525 | ||
1107d2e0 | 526 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
527 | if (!pkt) |
528 | goto no_pkt; | |
1da177e4 | 529 | |
e1bc89bc | 530 | pkt->frames = frames; |
ccc5c9ca | 531 | pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames); |
1da177e4 LT |
532 | if (!pkt->w_bio) |
533 | goto no_bio; | |
534 | ||
e1bc89bc | 535 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
536 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
537 | if (!pkt->pages[i]) | |
538 | goto no_page; | |
539 | } | |
540 | ||
541 | spin_lock_init(&pkt->lock); | |
c5ecc484 | 542 | bio_list_init(&pkt->orig_bios); |
1da177e4 | 543 | |
e1bc89bc | 544 | for (i = 0; i < frames; i++) { |
ccc5c9ca | 545 | struct bio *bio = bio_kmalloc(GFP_KERNEL, 1); |
1da177e4 LT |
546 | if (!bio) |
547 | goto no_rd_bio; | |
ccc5c9ca | 548 | |
1da177e4 LT |
549 | pkt->r_bios[i] = bio; |
550 | } | |
551 | ||
552 | return pkt; | |
553 | ||
554 | no_rd_bio: | |
e1bc89bc | 555 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
556 | struct bio *bio = pkt->r_bios[i]; |
557 | if (bio) | |
558 | bio_put(bio); | |
559 | } | |
560 | ||
561 | no_page: | |
e1bc89bc | 562 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
563 | if (pkt->pages[i]) |
564 | __free_page(pkt->pages[i]); | |
565 | bio_put(pkt->w_bio); | |
566 | no_bio: | |
567 | kfree(pkt); | |
568 | no_pkt: | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | /* | |
573 | * Free a packet_data struct | |
574 | */ | |
575 | static void pkt_free_packet_data(struct packet_data *pkt) | |
576 | { | |
577 | int i; | |
578 | ||
e1bc89bc | 579 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
580 | struct bio *bio = pkt->r_bios[i]; |
581 | if (bio) | |
582 | bio_put(bio); | |
583 | } | |
e1bc89bc | 584 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
585 | __free_page(pkt->pages[i]); |
586 | bio_put(pkt->w_bio); | |
587 | kfree(pkt); | |
588 | } | |
589 | ||
590 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
591 | { | |
592 | struct packet_data *pkt, *next; | |
593 | ||
594 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
595 | ||
596 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
597 | pkt_free_packet_data(pkt); | |
598 | } | |
e1bc89bc | 599 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
600 | } |
601 | ||
602 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
603 | { | |
604 | struct packet_data *pkt; | |
605 | ||
e1bc89bc PO |
606 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
607 | ||
1da177e4 | 608 | while (nr_packets > 0) { |
e1bc89bc | 609 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
610 | if (!pkt) { |
611 | pkt_shrink_pktlist(pd); | |
612 | return 0; | |
613 | } | |
614 | pkt->id = nr_packets; | |
615 | pkt->pd = pd; | |
616 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
617 | nr_packets--; | |
618 | } | |
619 | return 1; | |
620 | } | |
621 | ||
1da177e4 LT |
622 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
623 | { | |
624 | struct rb_node *n = rb_next(&node->rb_node); | |
625 | if (!n) | |
626 | return NULL; | |
627 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
628 | } | |
629 | ||
ac893963 | 630 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
631 | { |
632 | rb_erase(&node->rb_node, &pd->bio_queue); | |
633 | mempool_free(node, pd->rb_pool); | |
634 | pd->bio_queue_size--; | |
635 | BUG_ON(pd->bio_queue_size < 0); | |
636 | } | |
637 | ||
638 | /* | |
639 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
640 | */ | |
641 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
642 | { | |
643 | struct rb_node *n = pd->bio_queue.rb_node; | |
644 | struct rb_node *next; | |
645 | struct pkt_rb_node *tmp; | |
646 | ||
647 | if (!n) { | |
648 | BUG_ON(pd->bio_queue_size > 0); | |
649 | return NULL; | |
650 | } | |
651 | ||
652 | for (;;) { | |
653 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
4f024f37 | 654 | if (s <= tmp->bio->bi_iter.bi_sector) |
1da177e4 LT |
655 | next = n->rb_left; |
656 | else | |
657 | next = n->rb_right; | |
658 | if (!next) | |
659 | break; | |
660 | n = next; | |
661 | } | |
662 | ||
4f024f37 | 663 | if (s > tmp->bio->bi_iter.bi_sector) { |
1da177e4 LT |
664 | tmp = pkt_rbtree_next(tmp); |
665 | if (!tmp) | |
666 | return NULL; | |
667 | } | |
4f024f37 | 668 | BUG_ON(s > tmp->bio->bi_iter.bi_sector); |
1da177e4 LT |
669 | return tmp; |
670 | } | |
671 | ||
672 | /* | |
673 | * Insert a node into the pd->bio_queue rb tree. | |
674 | */ | |
675 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
676 | { | |
677 | struct rb_node **p = &pd->bio_queue.rb_node; | |
678 | struct rb_node *parent = NULL; | |
4f024f37 | 679 | sector_t s = node->bio->bi_iter.bi_sector; |
1da177e4 LT |
680 | struct pkt_rb_node *tmp; |
681 | ||
682 | while (*p) { | |
683 | parent = *p; | |
684 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
4f024f37 | 685 | if (s < tmp->bio->bi_iter.bi_sector) |
1da177e4 LT |
686 | p = &(*p)->rb_left; |
687 | else | |
688 | p = &(*p)->rb_right; | |
689 | } | |
690 | rb_link_node(&node->rb_node, parent, p); | |
691 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
692 | pd->bio_queue_size++; | |
693 | } | |
694 | ||
1da177e4 LT |
695 | /* |
696 | * Send a packet_command to the underlying block device and | |
697 | * wait for completion. | |
698 | */ | |
699 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
700 | { | |
165125e1 | 701 | struct request_queue *q = bdev_get_queue(pd->bdev); |
1da177e4 | 702 | struct request *rq; |
406c9b60 CH |
703 | int ret = 0; |
704 | ||
705 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
706 | WRITE : READ, __GFP_WAIT); | |
707 | ||
708 | if (cgc->buflen) { | |
8586ea96 JL |
709 | ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, |
710 | __GFP_WAIT); | |
711 | if (ret) | |
406c9b60 CH |
712 | goto out; |
713 | } | |
1da177e4 | 714 | |
91e4ee38 | 715 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
406c9b60 | 716 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
1da177e4 | 717 | |
1da177e4 | 718 | rq->timeout = 60*HZ; |
4aff5e23 | 719 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
1da177e4 | 720 | if (cgc->quiet) |
4aff5e23 | 721 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 | 722 | |
406c9b60 | 723 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
cbc31a47 AM |
724 | if (rq->errors) |
725 | ret = -EIO; | |
406c9b60 | 726 | out: |
1da177e4 | 727 | blk_put_request(rq); |
406c9b60 | 728 | return ret; |
1da177e4 LT |
729 | } |
730 | ||
99481334 JP |
731 | static const char *sense_key_string(__u8 index) |
732 | { | |
733 | static const char * const info[] = { | |
734 | "No sense", "Recovered error", "Not ready", | |
735 | "Medium error", "Hardware error", "Illegal request", | |
736 | "Unit attention", "Data protect", "Blank check", | |
737 | }; | |
738 | ||
739 | return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; | |
740 | } | |
741 | ||
1da177e4 LT |
742 | /* |
743 | * A generic sense dump / resolve mechanism should be implemented across | |
744 | * all ATAPI + SCSI devices. | |
745 | */ | |
f3ded788 JP |
746 | static void pkt_dump_sense(struct pktcdvd_device *pd, |
747 | struct packet_command *cgc) | |
1da177e4 | 748 | { |
1da177e4 LT |
749 | struct request_sense *sense = cgc->sense; |
750 | ||
99481334 | 751 | if (sense) |
f3ded788 JP |
752 | pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n", |
753 | CDROM_PACKET_SIZE, cgc->cmd, | |
754 | sense->sense_key, sense->asc, sense->ascq, | |
755 | sense_key_string(sense->sense_key)); | |
99481334 | 756 | else |
f3ded788 | 757 | pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd); |
1da177e4 LT |
758 | } |
759 | ||
760 | /* | |
761 | * flush the drive cache to media | |
762 | */ | |
763 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
764 | { | |
765 | struct packet_command cgc; | |
766 | ||
767 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
768 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
769 | cgc.quiet = 1; | |
770 | ||
771 | /* | |
772 | * the IMMED bit -- we default to not setting it, although that | |
773 | * would allow a much faster close, this is safer | |
774 | */ | |
775 | #if 0 | |
776 | cgc.cmd[1] = 1 << 1; | |
777 | #endif | |
778 | return pkt_generic_packet(pd, &cgc); | |
779 | } | |
780 | ||
781 | /* | |
782 | * speed is given as the normal factor, e.g. 4 for 4x | |
783 | */ | |
05680d86 PO |
784 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
785 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
786 | { |
787 | struct packet_command cgc; | |
788 | struct request_sense sense; | |
789 | int ret; | |
790 | ||
791 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
792 | cgc.sense = &sense; | |
793 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
794 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
795 | cgc.cmd[3] = read_speed & 0xff; | |
796 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
797 | cgc.cmd[5] = write_speed & 0xff; | |
798 | ||
799 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
f3ded788 | 800 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
801 | |
802 | return ret; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Queue a bio for processing by the low-level CD device. Must be called | |
807 | * from process context. | |
808 | */ | |
46c271be | 809 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
810 | { |
811 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
812 | if (bio_data_dir(bio) == READ) |
813 | bio_list_add(&pd->iosched.read_queue, bio); | |
814 | else | |
815 | bio_list_add(&pd->iosched.write_queue, bio); | |
1da177e4 LT |
816 | spin_unlock(&pd->iosched.lock); |
817 | ||
818 | atomic_set(&pd->iosched.attention, 1); | |
819 | wake_up(&pd->wqueue); | |
820 | } | |
821 | ||
822 | /* | |
823 | * Process the queued read/write requests. This function handles special | |
824 | * requirements for CDRW drives: | |
825 | * - A cache flush command must be inserted before a read request if the | |
826 | * previous request was a write. | |
46c271be | 827 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 828 | * than necessary. |
46c271be PO |
829 | * - Optimize for throughput at the expense of latency. This means that streaming |
830 | * writes will never be interrupted by a read, but if the drive has to seek | |
831 | * before the next write, switch to reading instead if there are any pending | |
832 | * read requests. | |
1da177e4 LT |
833 | * - Set the read speed according to current usage pattern. When only reading |
834 | * from the device, it's best to use the highest possible read speed, but | |
835 | * when switching often between reading and writing, it's better to have the | |
836 | * same read and write speeds. | |
1da177e4 LT |
837 | */ |
838 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
839 | { | |
1da177e4 LT |
840 | |
841 | if (atomic_read(&pd->iosched.attention) == 0) | |
842 | return; | |
843 | atomic_set(&pd->iosched.attention, 0); | |
844 | ||
1da177e4 LT |
845 | for (;;) { |
846 | struct bio *bio; | |
46c271be | 847 | int reads_queued, writes_queued; |
1da177e4 LT |
848 | |
849 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
850 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
851 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
1da177e4 LT |
852 | spin_unlock(&pd->iosched.lock); |
853 | ||
854 | if (!reads_queued && !writes_queued) | |
855 | break; | |
856 | ||
857 | if (pd->iosched.writing) { | |
46c271be PO |
858 | int need_write_seek = 1; |
859 | spin_lock(&pd->iosched.lock); | |
c5ecc484 | 860 | bio = bio_list_peek(&pd->iosched.write_queue); |
46c271be | 861 | spin_unlock(&pd->iosched.lock); |
4f024f37 KO |
862 | if (bio && (bio->bi_iter.bi_sector == |
863 | pd->iosched.last_write)) | |
46c271be PO |
864 | need_write_seek = 0; |
865 | if (need_write_seek && reads_queued) { | |
1da177e4 | 866 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
844aa797 | 867 | pkt_dbg(2, pd, "write, waiting\n"); |
1da177e4 LT |
868 | break; |
869 | } | |
870 | pkt_flush_cache(pd); | |
871 | pd->iosched.writing = 0; | |
872 | } | |
873 | } else { | |
874 | if (!reads_queued && writes_queued) { | |
875 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
844aa797 | 876 | pkt_dbg(2, pd, "read, waiting\n"); |
1da177e4 LT |
877 | break; |
878 | } | |
879 | pd->iosched.writing = 1; | |
880 | } | |
881 | } | |
882 | ||
883 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
884 | if (pd->iosched.writing) |
885 | bio = bio_list_pop(&pd->iosched.write_queue); | |
886 | else | |
887 | bio = bio_list_pop(&pd->iosched.read_queue); | |
1da177e4 LT |
888 | spin_unlock(&pd->iosched.lock); |
889 | ||
890 | if (!bio) | |
891 | continue; | |
892 | ||
893 | if (bio_data_dir(bio) == READ) | |
4f024f37 KO |
894 | pd->iosched.successive_reads += |
895 | bio->bi_iter.bi_size >> 10; | |
46c271be | 896 | else { |
1da177e4 | 897 | pd->iosched.successive_reads = 0; |
f73a1c7d | 898 | pd->iosched.last_write = bio_end_sector(bio); |
46c271be | 899 | } |
1da177e4 LT |
900 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
901 | if (pd->read_speed == pd->write_speed) { | |
902 | pd->read_speed = MAX_SPEED; | |
903 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
904 | } | |
905 | } else { | |
906 | if (pd->read_speed != pd->write_speed) { | |
907 | pd->read_speed = pd->write_speed; | |
908 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
909 | } | |
910 | } | |
911 | ||
912 | atomic_inc(&pd->cdrw.pending_bios); | |
913 | generic_make_request(bio); | |
914 | } | |
915 | } | |
916 | ||
917 | /* | |
918 | * Special care is needed if the underlying block device has a small | |
919 | * max_phys_segments value. | |
920 | */ | |
165125e1 | 921 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 | 922 | { |
ae03bf63 | 923 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
8a78362c | 924 | <= queue_max_segments(q)) { |
1da177e4 LT |
925 | /* |
926 | * The cdrom device can handle one segment/frame | |
927 | */ | |
928 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
929 | return 0; | |
ae03bf63 | 930 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
8a78362c | 931 | <= queue_max_segments(q)) { |
1da177e4 LT |
932 | /* |
933 | * We can handle this case at the expense of some extra memory | |
934 | * copies during write operations | |
935 | */ | |
936 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
937 | return 0; | |
938 | } else { | |
fa63c0ab | 939 | pkt_err(pd, "cdrom max_phys_segments too small\n"); |
1da177e4 LT |
940 | return -EIO; |
941 | } | |
942 | } | |
943 | ||
1da177e4 LT |
944 | /* |
945 | * Copy all data for this packet to pkt->pages[], so that | |
946 | * a) The number of required segments for the write bio is minimized, which | |
947 | * is necessary for some scsi controllers. | |
948 | * b) The data can be used as cache to avoid read requests if we receive a | |
949 | * new write request for the same zone. | |
950 | */ | |
72772323 | 951 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
952 | { |
953 | int f, p, offs; | |
954 | ||
955 | /* Copy all data to pkt->pages[] */ | |
956 | p = 0; | |
957 | offs = 0; | |
958 | for (f = 0; f < pkt->frames; f++) { | |
72772323 | 959 | if (bvec[f].bv_page != pkt->pages[p]) { |
cfd8005c | 960 | void *vfrom = kmap_atomic(bvec[f].bv_page) + bvec[f].bv_offset; |
1da177e4 LT |
961 | void *vto = page_address(pkt->pages[p]) + offs; |
962 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
cfd8005c | 963 | kunmap_atomic(vfrom); |
72772323 PO |
964 | bvec[f].bv_page = pkt->pages[p]; |
965 | bvec[f].bv_offset = offs; | |
1da177e4 | 966 | } else { |
72772323 | 967 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
968 | } |
969 | offs += CD_FRAMESIZE; | |
970 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
971 | offs = 0; |
972 | p++; | |
973 | } | |
974 | } | |
975 | } | |
976 | ||
6712ecf8 | 977 | static void pkt_end_io_read(struct bio *bio, int err) |
1da177e4 LT |
978 | { |
979 | struct packet_data *pkt = bio->bi_private; | |
980 | struct pktcdvd_device *pd = pkt->pd; | |
981 | BUG_ON(!pd); | |
982 | ||
844aa797 | 983 | pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n", |
cd3f2cd0 | 984 | bio, (unsigned long long)pkt->sector, |
4f024f37 | 985 | (unsigned long long)bio->bi_iter.bi_sector, err); |
1da177e4 LT |
986 | |
987 | if (err) | |
988 | atomic_inc(&pkt->io_errors); | |
989 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
990 | atomic_inc(&pkt->run_sm); | |
991 | wake_up(&pd->wqueue); | |
992 | } | |
993 | pkt_bio_finished(pd); | |
1da177e4 LT |
994 | } |
995 | ||
6712ecf8 | 996 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
1da177e4 LT |
997 | { |
998 | struct packet_data *pkt = bio->bi_private; | |
999 | struct pktcdvd_device *pd = pkt->pd; | |
1000 | BUG_ON(!pd); | |
1001 | ||
844aa797 | 1002 | pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, err); |
1da177e4 LT |
1003 | |
1004 | pd->stats.pkt_ended++; | |
1005 | ||
1006 | pkt_bio_finished(pd); | |
1007 | atomic_dec(&pkt->io_wait); | |
1008 | atomic_inc(&pkt->run_sm); | |
1009 | wake_up(&pd->wqueue); | |
1da177e4 LT |
1010 | } |
1011 | ||
1012 | /* | |
1013 | * Schedule reads for the holes in a packet | |
1014 | */ | |
1015 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1016 | { | |
1017 | int frames_read = 0; | |
1018 | struct bio *bio; | |
1019 | int f; | |
1020 | char written[PACKET_MAX_SIZE]; | |
1021 | ||
c5ecc484 | 1022 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1da177e4 LT |
1023 | |
1024 | atomic_set(&pkt->io_wait, 0); | |
1025 | atomic_set(&pkt->io_errors, 0); | |
1026 | ||
1da177e4 LT |
1027 | /* |
1028 | * Figure out which frames we need to read before we can write. | |
1029 | */ | |
1030 | memset(written, 0, sizeof(written)); | |
1031 | spin_lock(&pkt->lock); | |
c5ecc484 | 1032 | bio_list_for_each(bio, &pkt->orig_bios) { |
4f024f37 KO |
1033 | int first_frame = (bio->bi_iter.bi_sector - pkt->sector) / |
1034 | (CD_FRAMESIZE >> 9); | |
1035 | int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1036 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1037 | BUG_ON(first_frame < 0); |
1038 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1039 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1040 | written[f] = 1; | |
1041 | } | |
1042 | spin_unlock(&pkt->lock); | |
1043 | ||
06e7ab53 | 1044 | if (pkt->cache_valid) { |
844aa797 | 1045 | pkt_dbg(2, pd, "zone %llx cached\n", |
06e7ab53 PO |
1046 | (unsigned long long)pkt->sector); |
1047 | goto out_account; | |
1048 | } | |
1049 | ||
1da177e4 LT |
1050 | /* |
1051 | * Schedule reads for missing parts of the packet. | |
1052 | */ | |
1053 | for (f = 0; f < pkt->frames; f++) { | |
1054 | int p, offset; | |
ccc5c9ca | 1055 | |
1da177e4 LT |
1056 | if (written[f]) |
1057 | continue; | |
ccc5c9ca | 1058 | |
1da177e4 | 1059 | bio = pkt->r_bios[f]; |
ccc5c9ca | 1060 | bio_reset(bio); |
4f024f37 | 1061 | bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1062 | bio->bi_bdev = pd->bdev; |
1063 | bio->bi_end_io = pkt_end_io_read; | |
1064 | bio->bi_private = pkt; | |
1065 | ||
1066 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1067 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
844aa797 | 1068 | pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n", |
1da177e4 LT |
1069 | f, pkt->pages[p], offset); |
1070 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1071 | BUG(); | |
1072 | ||
1073 | atomic_inc(&pkt->io_wait); | |
1074 | bio->bi_rw = READ; | |
46c271be | 1075 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1076 | frames_read++; |
1077 | } | |
1078 | ||
1079 | out_account: | |
844aa797 | 1080 | pkt_dbg(2, pd, "need %d frames for zone %llx\n", |
1da177e4 LT |
1081 | frames_read, (unsigned long long)pkt->sector); |
1082 | pd->stats.pkt_started++; | |
1083 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1084 | } |
1085 | ||
1086 | /* | |
1087 | * Find a packet matching zone, or the least recently used packet if | |
1088 | * there is no match. | |
1089 | */ | |
1090 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1091 | { | |
1092 | struct packet_data *pkt; | |
1093 | ||
1094 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1095 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1096 | list_del_init(&pkt->list); | |
1097 | if (pkt->sector != zone) | |
1098 | pkt->cache_valid = 0; | |
610827de | 1099 | return pkt; |
1da177e4 LT |
1100 | } |
1101 | } | |
610827de PO |
1102 | BUG(); |
1103 | return NULL; | |
1da177e4 LT |
1104 | } |
1105 | ||
1106 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1107 | { | |
1108 | if (pkt->cache_valid) { | |
1109 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1110 | } else { | |
1111 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * recover a failed write, query for relocation if possible | |
1117 | * | |
1118 | * returns 1 if recovery is possible, or 0 if not | |
1119 | * | |
1120 | */ | |
1121 | static int pkt_start_recovery(struct packet_data *pkt) | |
1122 | { | |
1123 | /* | |
1124 | * FIXME. We need help from the file system to implement | |
1125 | * recovery handling. | |
1126 | */ | |
1127 | return 0; | |
1128 | #if 0 | |
1129 | struct request *rq = pkt->rq; | |
1130 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1131 | struct block_device *pkt_bdev; | |
1132 | struct super_block *sb = NULL; | |
1133 | unsigned long old_block, new_block; | |
1134 | sector_t new_sector; | |
1135 | ||
1136 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1137 | if (pkt_bdev) { | |
1138 | sb = get_super(pkt_bdev); | |
1139 | bdput(pkt_bdev); | |
1140 | } | |
1141 | ||
1142 | if (!sb) | |
1143 | return 0; | |
1144 | ||
e7f59097 | 1145 | if (!sb->s_op->relocate_blocks) |
1da177e4 LT |
1146 | goto out; |
1147 | ||
1148 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1149 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1150 | goto out; | |
1151 | ||
1152 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1153 | pkt->sector = new_sector; | |
1154 | ||
ff8e0070 KO |
1155 | bio_reset(pkt->bio); |
1156 | pkt->bio->bi_bdev = pd->bdev; | |
1157 | pkt->bio->bi_rw = REQ_WRITE; | |
4f024f37 KO |
1158 | pkt->bio->bi_iter.bi_sector = new_sector; |
1159 | pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE; | |
ff8e0070 | 1160 | pkt->bio->bi_vcnt = pkt->frames; |
1da177e4 | 1161 | |
ff8e0070 KO |
1162 | pkt->bio->bi_end_io = pkt_end_io_packet_write; |
1163 | pkt->bio->bi_private = pkt; | |
1da177e4 LT |
1164 | |
1165 | drop_super(sb); | |
1166 | return 1; | |
1167 | ||
1168 | out: | |
1169 | drop_super(sb); | |
1170 | return 0; | |
1171 | #endif | |
1172 | } | |
1173 | ||
1174 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1175 | { | |
1176 | #if PACKET_DEBUG > 1 | |
1177 | static const char *state_name[] = { | |
1178 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1179 | }; | |
1180 | enum packet_data_state old_state = pkt->state; | |
844aa797 | 1181 | pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n", |
cd3f2cd0 | 1182 | pkt->id, (unsigned long long)pkt->sector, |
1da177e4 LT |
1183 | state_name[old_state], state_name[state]); |
1184 | #endif | |
1185 | pkt->state = state; | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * Scan the work queue to see if we can start a new packet. | |
1190 | * returns non-zero if any work was done. | |
1191 | */ | |
1192 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1193 | { | |
1194 | struct packet_data *pkt, *p; | |
1195 | struct bio *bio = NULL; | |
1196 | sector_t zone = 0; /* Suppress gcc warning */ | |
1197 | struct pkt_rb_node *node, *first_node; | |
1198 | struct rb_node *n; | |
0a0fc960 | 1199 | int wakeup; |
1da177e4 | 1200 | |
1da177e4 LT |
1201 | atomic_set(&pd->scan_queue, 0); |
1202 | ||
1203 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
844aa797 | 1204 | pkt_dbg(2, pd, "no pkt\n"); |
1da177e4 LT |
1205 | return 0; |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Try to find a zone we are not already working on. | |
1210 | */ | |
1211 | spin_lock(&pd->lock); | |
1212 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1213 | if (!first_node) { | |
1214 | n = rb_first(&pd->bio_queue); | |
1215 | if (n) | |
1216 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1217 | } | |
1218 | node = first_node; | |
1219 | while (node) { | |
1220 | bio = node->bio; | |
4f024f37 | 1221 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 | 1222 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
7baeb6a5 PO |
1223 | if (p->sector == zone) { |
1224 | bio = NULL; | |
1da177e4 | 1225 | goto try_next_bio; |
7baeb6a5 | 1226 | } |
1da177e4 LT |
1227 | } |
1228 | break; | |
1229 | try_next_bio: | |
1230 | node = pkt_rbtree_next(node); | |
1231 | if (!node) { | |
1232 | n = rb_first(&pd->bio_queue); | |
1233 | if (n) | |
1234 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1235 | } | |
1236 | if (node == first_node) | |
1237 | node = NULL; | |
1238 | } | |
1239 | spin_unlock(&pd->lock); | |
1240 | if (!bio) { | |
844aa797 | 1241 | pkt_dbg(2, pd, "no bio\n"); |
1da177e4 LT |
1242 | return 0; |
1243 | } | |
1244 | ||
1245 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1246 | |
1247 | pd->current_sector = zone + pd->settings.size; | |
1248 | pkt->sector = zone; | |
e1bc89bc | 1249 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1250 | pkt->write_size = 0; |
1251 | ||
1252 | /* | |
1253 | * Scan work queue for bios in the same zone and link them | |
1254 | * to this packet. | |
1255 | */ | |
1256 | spin_lock(&pd->lock); | |
844aa797 | 1257 | pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone); |
1da177e4 LT |
1258 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
1259 | bio = node->bio; | |
4f024f37 KO |
1260 | pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long) |
1261 | get_zone(bio->bi_iter.bi_sector, pd)); | |
1262 | if (get_zone(bio->bi_iter.bi_sector, pd) != zone) | |
1da177e4 LT |
1263 | break; |
1264 | pkt_rbtree_erase(pd, node); | |
1265 | spin_lock(&pkt->lock); | |
c5ecc484 | 1266 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 | 1267 | pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE; |
1da177e4 LT |
1268 | spin_unlock(&pkt->lock); |
1269 | } | |
0a0fc960 TM |
1270 | /* check write congestion marks, and if bio_queue_size is |
1271 | below, wake up any waiters */ | |
1272 | wakeup = (pd->write_congestion_on > 0 | |
1273 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1274 | spin_unlock(&pd->lock); |
8aa7e847 JA |
1275 | if (wakeup) { |
1276 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, | |
1277 | BLK_RW_ASYNC); | |
1278 | } | |
1da177e4 LT |
1279 | |
1280 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1281 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1282 | atomic_set(&pkt->run_sm, 1); | |
1283 | ||
1284 | spin_lock(&pd->cdrw.active_list_lock); | |
1285 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1286 | spin_unlock(&pd->cdrw.active_list_lock); | |
1287 | ||
1288 | return 1; | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Assemble a bio to write one packet and queue the bio for processing | |
1293 | * by the underlying block device. | |
1294 | */ | |
1295 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1296 | { | |
1da177e4 | 1297 | int f; |
72772323 | 1298 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 | 1299 | |
ffb25dc6 | 1300 | bio_reset(pkt->w_bio); |
4f024f37 | 1301 | pkt->w_bio->bi_iter.bi_sector = pkt->sector; |
ffb25dc6 KO |
1302 | pkt->w_bio->bi_bdev = pd->bdev; |
1303 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1304 | pkt->w_bio->bi_private = pkt; | |
1305 | ||
1306 | /* XXX: locking? */ | |
1da177e4 | 1307 | for (f = 0; f < pkt->frames; f++) { |
72772323 PO |
1308 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1309 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
ffb25dc6 KO |
1310 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) |
1311 | BUG(); | |
1da177e4 | 1312 | } |
844aa797 | 1313 | pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1314 | |
1315 | /* | |
72772323 | 1316 | * Fill-in bvec with data from orig_bios. |
1da177e4 | 1317 | */ |
1da177e4 | 1318 | spin_lock(&pkt->lock); |
ffb25dc6 | 1319 | bio_copy_data(pkt->w_bio, pkt->orig_bios.head); |
1da177e4 | 1320 | |
1da177e4 LT |
1321 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
1322 | spin_unlock(&pkt->lock); | |
1323 | ||
844aa797 | 1324 | pkt_dbg(2, pd, "Writing %d frames for zone %llx\n", |
ffb25dc6 | 1325 | pkt->write_size, (unsigned long long)pkt->sector); |
1da177e4 LT |
1326 | |
1327 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1328 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1329 | pkt->cache_valid = 1; |
1330 | } else { | |
1331 | pkt->cache_valid = 0; | |
1332 | } | |
1333 | ||
1334 | /* Start the write request */ | |
1da177e4 LT |
1335 | atomic_set(&pkt->io_wait, 1); |
1336 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1337 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1341 | { | |
c5ecc484 | 1342 | struct bio *bio; |
1da177e4 LT |
1343 | |
1344 | if (!uptodate) | |
1345 | pkt->cache_valid = 0; | |
1346 | ||
1347 | /* Finish all bios corresponding to this packet */ | |
c5ecc484 | 1348 | while ((bio = bio_list_pop(&pkt->orig_bios))) |
6712ecf8 | 1349 | bio_endio(bio, uptodate ? 0 : -EIO); |
1da177e4 LT |
1350 | } |
1351 | ||
1352 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1353 | { | |
1354 | int uptodate; | |
1355 | ||
844aa797 | 1356 | pkt_dbg(2, pd, "pkt %d\n", pkt->id); |
1da177e4 LT |
1357 | |
1358 | for (;;) { | |
1359 | switch (pkt->state) { | |
1360 | case PACKET_WAITING_STATE: | |
1361 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1362 | return; | |
1363 | ||
1364 | pkt->sleep_time = 0; | |
1365 | pkt_gather_data(pd, pkt); | |
1366 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1367 | break; | |
1368 | ||
1369 | case PACKET_READ_WAIT_STATE: | |
1370 | if (atomic_read(&pkt->io_wait) > 0) | |
1371 | return; | |
1372 | ||
1373 | if (atomic_read(&pkt->io_errors) > 0) { | |
1374 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1375 | } else { | |
1376 | pkt_start_write(pd, pkt); | |
1377 | } | |
1378 | break; | |
1379 | ||
1380 | case PACKET_WRITE_WAIT_STATE: | |
1381 | if (atomic_read(&pkt->io_wait) > 0) | |
1382 | return; | |
1383 | ||
1384 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1385 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1386 | } else { | |
1387 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1388 | } | |
1389 | break; | |
1390 | ||
1391 | case PACKET_RECOVERY_STATE: | |
1392 | if (pkt_start_recovery(pkt)) { | |
1393 | pkt_start_write(pd, pkt); | |
1394 | } else { | |
844aa797 | 1395 | pkt_dbg(2, pd, "No recovery possible\n"); |
1da177e4 LT |
1396 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1397 | } | |
1398 | break; | |
1399 | ||
1400 | case PACKET_FINISHED_STATE: | |
1401 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1402 | pkt_finish_packet(pkt, uptodate); | |
1403 | return; | |
1404 | ||
1405 | default: | |
1406 | BUG(); | |
1407 | break; | |
1408 | } | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1413 | { | |
1414 | struct packet_data *pkt, *next; | |
1415 | ||
1da177e4 LT |
1416 | /* |
1417 | * Run state machine for active packets | |
1418 | */ | |
1419 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1420 | if (atomic_read(&pkt->run_sm) > 0) { | |
1421 | atomic_set(&pkt->run_sm, 0); | |
1422 | pkt_run_state_machine(pd, pkt); | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * Move no longer active packets to the free list | |
1428 | */ | |
1429 | spin_lock(&pd->cdrw.active_list_lock); | |
1430 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1431 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1432 | list_del(&pkt->list); | |
1433 | pkt_put_packet_data(pd, pkt); | |
1434 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1435 | atomic_set(&pd->scan_queue, 1); | |
1436 | } | |
1437 | } | |
1438 | spin_unlock(&pd->cdrw.active_list_lock); | |
1439 | } | |
1440 | ||
1441 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1442 | { | |
1443 | struct packet_data *pkt; | |
1444 | int i; | |
1445 | ||
ae7642bb | 1446 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1447 | states[i] = 0; |
1448 | ||
1449 | spin_lock(&pd->cdrw.active_list_lock); | |
1450 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1451 | states[pkt->state]++; | |
1452 | } | |
1453 | spin_unlock(&pd->cdrw.active_list_lock); | |
1454 | } | |
1455 | ||
1456 | /* | |
1457 | * kcdrwd is woken up when writes have been queued for one of our | |
1458 | * registered devices | |
1459 | */ | |
1460 | static int kcdrwd(void *foobar) | |
1461 | { | |
1462 | struct pktcdvd_device *pd = foobar; | |
1463 | struct packet_data *pkt; | |
1464 | long min_sleep_time, residue; | |
1465 | ||
8698a745 | 1466 | set_user_nice(current, MIN_NICE); |
83144186 | 1467 | set_freezable(); |
1da177e4 LT |
1468 | |
1469 | for (;;) { | |
1470 | DECLARE_WAITQUEUE(wait, current); | |
1471 | ||
1472 | /* | |
1473 | * Wait until there is something to do | |
1474 | */ | |
1475 | add_wait_queue(&pd->wqueue, &wait); | |
1476 | for (;;) { | |
1477 | set_current_state(TASK_INTERRUPTIBLE); | |
1478 | ||
1479 | /* Check if we need to run pkt_handle_queue */ | |
1480 | if (atomic_read(&pd->scan_queue) > 0) | |
1481 | goto work_to_do; | |
1482 | ||
1483 | /* Check if we need to run the state machine for some packet */ | |
1484 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1485 | if (atomic_read(&pkt->run_sm) > 0) | |
1486 | goto work_to_do; | |
1487 | } | |
1488 | ||
1489 | /* Check if we need to process the iosched queues */ | |
1490 | if (atomic_read(&pd->iosched.attention) != 0) | |
1491 | goto work_to_do; | |
1492 | ||
1493 | /* Otherwise, go to sleep */ | |
1494 | if (PACKET_DEBUG > 1) { | |
1495 | int states[PACKET_NUM_STATES]; | |
1496 | pkt_count_states(pd, states); | |
844aa797 | 1497 | pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
cd3f2cd0 JP |
1498 | states[0], states[1], states[2], |
1499 | states[3], states[4], states[5]); | |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1503 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1504 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1505 | min_sleep_time = pkt->sleep_time; | |
1506 | } | |
1507 | ||
844aa797 | 1508 | pkt_dbg(2, pd, "sleeping\n"); |
1da177e4 | 1509 | residue = schedule_timeout(min_sleep_time); |
844aa797 | 1510 | pkt_dbg(2, pd, "wake up\n"); |
1da177e4 LT |
1511 | |
1512 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1513 | try_to_freeze(); |
1da177e4 LT |
1514 | |
1515 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1516 | if (!pkt->sleep_time) | |
1517 | continue; | |
1518 | pkt->sleep_time -= min_sleep_time - residue; | |
1519 | if (pkt->sleep_time <= 0) { | |
1520 | pkt->sleep_time = 0; | |
1521 | atomic_inc(&pkt->run_sm); | |
1522 | } | |
1523 | } | |
1524 | ||
1da177e4 LT |
1525 | if (kthread_should_stop()) |
1526 | break; | |
1527 | } | |
1528 | work_to_do: | |
1529 | set_current_state(TASK_RUNNING); | |
1530 | remove_wait_queue(&pd->wqueue, &wait); | |
1531 | ||
1532 | if (kthread_should_stop()) | |
1533 | break; | |
1534 | ||
1535 | /* | |
1536 | * if pkt_handle_queue returns true, we can queue | |
1537 | * another request. | |
1538 | */ | |
1539 | while (pkt_handle_queue(pd)) | |
1540 | ; | |
1541 | ||
1542 | /* | |
1543 | * Handle packet state machine | |
1544 | */ | |
1545 | pkt_handle_packets(pd); | |
1546 | ||
1547 | /* | |
1548 | * Handle iosched queues | |
1549 | */ | |
1550 | pkt_iosched_process_queue(pd); | |
1551 | } | |
1552 | ||
1553 | return 0; | |
1554 | } | |
1555 | ||
1556 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1557 | { | |
0c075d64 JP |
1558 | pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n", |
1559 | pd->settings.fp ? "Fixed" : "Variable", | |
1560 | pd->settings.size >> 2, | |
1561 | pd->settings.block_mode == 8 ? '1' : '2'); | |
1da177e4 LT |
1562 | } |
1563 | ||
1564 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1565 | { | |
1566 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1567 | ||
1568 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1569 | cgc->cmd[2] = page_code | (page_control << 6); | |
1570 | cgc->cmd[7] = cgc->buflen >> 8; | |
1571 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1572 | cgc->data_direction = CGC_DATA_READ; | |
1573 | return pkt_generic_packet(pd, cgc); | |
1574 | } | |
1575 | ||
1576 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1577 | { | |
1578 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1579 | memset(cgc->buffer, 0, 2); | |
1580 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1581 | cgc->cmd[1] = 0x10; /* PF */ | |
1582 | cgc->cmd[7] = cgc->buflen >> 8; | |
1583 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1584 | cgc->data_direction = CGC_DATA_WRITE; | |
1585 | return pkt_generic_packet(pd, cgc); | |
1586 | } | |
1587 | ||
1588 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1589 | { | |
1590 | struct packet_command cgc; | |
1591 | int ret; | |
1592 | ||
1593 | /* set up command and get the disc info */ | |
1594 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1595 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1596 | cgc.cmd[8] = cgc.buflen = 2; | |
1597 | cgc.quiet = 1; | |
1598 | ||
1599 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1600 | return ret; | |
1601 | ||
1602 | /* not all drives have the same disc_info length, so requeue | |
1603 | * packet with the length the drive tells us it can supply | |
1604 | */ | |
1605 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1606 | sizeof(di->disc_information_length); | |
1607 | ||
1608 | if (cgc.buflen > sizeof(disc_information)) | |
1609 | cgc.buflen = sizeof(disc_information); | |
1610 | ||
1611 | cgc.cmd[8] = cgc.buflen; | |
1612 | return pkt_generic_packet(pd, &cgc); | |
1613 | } | |
1614 | ||
1615 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1616 | { | |
1617 | struct packet_command cgc; | |
1618 | int ret; | |
1619 | ||
1620 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1621 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1622 | cgc.cmd[1] = type & 3; | |
1623 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1624 | cgc.cmd[5] = track & 0xff; | |
1625 | cgc.cmd[8] = 8; | |
1626 | cgc.quiet = 1; | |
1627 | ||
1628 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1629 | return ret; | |
1630 | ||
1631 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1632 | sizeof(ti->track_information_length); | |
1633 | ||
1634 | if (cgc.buflen > sizeof(track_information)) | |
1635 | cgc.buflen = sizeof(track_information); | |
1636 | ||
1637 | cgc.cmd[8] = cgc.buflen; | |
1638 | return pkt_generic_packet(pd, &cgc); | |
1639 | } | |
1640 | ||
05680d86 PO |
1641 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1642 | long *last_written) | |
1da177e4 LT |
1643 | { |
1644 | disc_information di; | |
1645 | track_information ti; | |
1646 | __u32 last_track; | |
1647 | int ret = -1; | |
1648 | ||
1649 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1650 | return ret; | |
1651 | ||
1652 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1653 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1654 | return ret; | |
1655 | ||
1656 | /* if this track is blank, try the previous. */ | |
1657 | if (ti.blank) { | |
1658 | last_track--; | |
1659 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1660 | return ret; | |
1661 | } | |
1662 | ||
1663 | /* if last recorded field is valid, return it. */ | |
1664 | if (ti.lra_v) { | |
1665 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1666 | } else { | |
1667 | /* make it up instead */ | |
1668 | *last_written = be32_to_cpu(ti.track_start) + | |
1669 | be32_to_cpu(ti.track_size); | |
1670 | if (ti.free_blocks) | |
1671 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1672 | } | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * write mode select package based on pd->settings | |
1678 | */ | |
05680d86 | 1679 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1680 | { |
1681 | struct packet_command cgc; | |
1682 | struct request_sense sense; | |
1683 | write_param_page *wp; | |
1684 | char buffer[128]; | |
1685 | int ret, size; | |
1686 | ||
1687 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1688 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1689 | return 0; | |
1690 | ||
1691 | memset(buffer, 0, sizeof(buffer)); | |
1692 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1693 | cgc.sense = &sense; | |
1694 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
f3ded788 | 1695 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1696 | return ret; |
1697 | } | |
1698 | ||
1699 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1700 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1701 | if (size > sizeof(buffer)) | |
1702 | size = sizeof(buffer); | |
1703 | ||
1704 | /* | |
1705 | * now get it all | |
1706 | */ | |
1707 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1708 | cgc.sense = &sense; | |
1709 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
f3ded788 | 1710 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1711 | return ret; |
1712 | } | |
1713 | ||
1714 | /* | |
1715 | * write page is offset header + block descriptor length | |
1716 | */ | |
1717 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1718 | ||
1719 | wp->fp = pd->settings.fp; | |
1720 | wp->track_mode = pd->settings.track_mode; | |
1721 | wp->write_type = pd->settings.write_type; | |
1722 | wp->data_block_type = pd->settings.block_mode; | |
1723 | ||
1724 | wp->multi_session = 0; | |
1725 | ||
1726 | #ifdef PACKET_USE_LS | |
1727 | wp->link_size = 7; | |
1728 | wp->ls_v = 1; | |
1729 | #endif | |
1730 | ||
1731 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1732 | wp->session_format = 0; | |
1733 | wp->subhdr2 = 0x20; | |
1734 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1735 | wp->session_format = 0x20; | |
1736 | wp->subhdr2 = 8; | |
1737 | #if 0 | |
1738 | wp->mcn[0] = 0x80; | |
1739 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1740 | #endif | |
1741 | } else { | |
1742 | /* | |
1743 | * paranoia | |
1744 | */ | |
fa63c0ab | 1745 | pkt_err(pd, "write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1746 | return 1; |
1747 | } | |
1748 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1749 | ||
1750 | cgc.buflen = cgc.cmd[8] = size; | |
1751 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
f3ded788 | 1752 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1753 | return ret; |
1754 | } | |
1755 | ||
1756 | pkt_print_settings(pd); | |
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | /* | |
7c613d59 | 1761 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1762 | */ |
ab863ec3 | 1763 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1764 | { |
ab863ec3 PO |
1765 | switch (pd->mmc3_profile) { |
1766 | case 0x1a: /* DVD+RW */ | |
1767 | case 0x12: /* DVD-RAM */ | |
1768 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1769 | return 1; | |
1770 | default: | |
1771 | break; | |
1772 | } | |
1da177e4 | 1773 | |
ab863ec3 PO |
1774 | if (!ti->packet || !ti->fp) |
1775 | return 0; | |
1da177e4 LT |
1776 | |
1777 | /* | |
1778 | * "good" settings as per Mt Fuji. | |
1779 | */ | |
ab863ec3 | 1780 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1781 | return 1; |
1da177e4 | 1782 | |
ab863ec3 | 1783 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1784 | return 1; |
1da177e4 | 1785 | |
ab863ec3 | 1786 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1787 | return 1; |
1da177e4 | 1788 | |
fa63c0ab | 1789 | pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1790 | return 0; |
1da177e4 LT |
1791 | } |
1792 | ||
1793 | /* | |
7c613d59 | 1794 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1795 | */ |
7c613d59 | 1796 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1797 | { |
1798 | switch (pd->mmc3_profile) { | |
1799 | case 0x0a: /* CD-RW */ | |
1800 | case 0xffff: /* MMC3 not supported */ | |
1801 | break; | |
1802 | case 0x1a: /* DVD+RW */ | |
1803 | case 0x13: /* DVD-RW */ | |
1804 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1805 | return 1; |
1da177e4 | 1806 | default: |
844aa797 | 1807 | pkt_dbg(2, pd, "Wrong disc profile (%x)\n", |
cd3f2cd0 | 1808 | pd->mmc3_profile); |
7c613d59 | 1809 | return 0; |
1da177e4 LT |
1810 | } |
1811 | ||
1812 | /* | |
1813 | * for disc type 0xff we should probably reserve a new track. | |
1814 | * but i'm not sure, should we leave this to user apps? probably. | |
1815 | */ | |
1816 | if (di->disc_type == 0xff) { | |
ca73dabc | 1817 | pkt_notice(pd, "unknown disc - no track?\n"); |
7c613d59 | 1818 | return 0; |
1da177e4 LT |
1819 | } |
1820 | ||
1821 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
fa63c0ab | 1822 | pkt_err(pd, "wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1823 | return 0; |
1da177e4 LT |
1824 | } |
1825 | ||
1826 | if (di->erasable == 0) { | |
ca73dabc | 1827 | pkt_notice(pd, "disc not erasable\n"); |
7c613d59 | 1828 | return 0; |
1da177e4 LT |
1829 | } |
1830 | ||
1831 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
fa63c0ab | 1832 | pkt_err(pd, "can't write to last track (reserved)\n"); |
7c613d59 | 1833 | return 0; |
1da177e4 LT |
1834 | } |
1835 | ||
7c613d59 | 1836 | return 1; |
1da177e4 LT |
1837 | } |
1838 | ||
05680d86 | 1839 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1840 | { |
1841 | struct packet_command cgc; | |
1842 | unsigned char buf[12]; | |
1843 | disc_information di; | |
1844 | track_information ti; | |
1845 | int ret, track; | |
1846 | ||
1847 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1848 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1849 | cgc.cmd[8] = 8; | |
1850 | ret = pkt_generic_packet(pd, &cgc); | |
1851 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1852 | ||
1853 | memset(&di, 0, sizeof(disc_information)); | |
1854 | memset(&ti, 0, sizeof(track_information)); | |
1855 | ||
1856 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
fa63c0ab | 1857 | pkt_err(pd, "failed get_disc\n"); |
1da177e4 LT |
1858 | return ret; |
1859 | } | |
1860 | ||
7c613d59 | 1861 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1862 | return -EROFS; |
1da177e4 | 1863 | |
1da177e4 LT |
1864 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1865 | ||
1866 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1867 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
fa63c0ab | 1868 | pkt_err(pd, "failed get_track\n"); |
1da177e4 LT |
1869 | return ret; |
1870 | } | |
1871 | ||
ab863ec3 | 1872 | if (!pkt_writable_track(pd, &ti)) { |
fa63c0ab | 1873 | pkt_err(pd, "can't write to this track\n"); |
9db91546 | 1874 | return -EROFS; |
1da177e4 LT |
1875 | } |
1876 | ||
1877 | /* | |
1878 | * we keep packet size in 512 byte units, makes it easier to | |
1879 | * deal with request calculations. | |
1880 | */ | |
1881 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1882 | if (pd->settings.size == 0) { | |
ca73dabc | 1883 | pkt_notice(pd, "detected zero packet size!\n"); |
a460ad62 | 1884 | return -ENXIO; |
1da177e4 | 1885 | } |
d0272e78 | 1886 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
fa63c0ab | 1887 | pkt_err(pd, "packet size is too big\n"); |
9db91546 | 1888 | return -EROFS; |
d0272e78 | 1889 | } |
1da177e4 LT |
1890 | pd->settings.fp = ti.fp; |
1891 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1892 | ||
1893 | if (ti.nwa_v) { | |
1894 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1895 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1896 | } | |
1897 | ||
1898 | /* | |
1899 | * in theory we could use lra on -RW media as well and just zero | |
1900 | * blocks that haven't been written yet, but in practice that | |
1901 | * is just a no-go. we'll use that for -R, naturally. | |
1902 | */ | |
1903 | if (ti.lra_v) { | |
1904 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1905 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1906 | } else { | |
1907 | pd->lra = 0xffffffff; | |
1908 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * fine for now | |
1913 | */ | |
1914 | pd->settings.link_loss = 7; | |
1915 | pd->settings.write_type = 0; /* packet */ | |
1916 | pd->settings.track_mode = ti.track_mode; | |
1917 | ||
1918 | /* | |
1919 | * mode1 or mode2 disc | |
1920 | */ | |
1921 | switch (ti.data_mode) { | |
1922 | case PACKET_MODE1: | |
1923 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1924 | break; | |
1925 | case PACKET_MODE2: | |
1926 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1927 | break; | |
1928 | default: | |
fa63c0ab | 1929 | pkt_err(pd, "unknown data mode\n"); |
9db91546 | 1930 | return -EROFS; |
1da177e4 LT |
1931 | } |
1932 | return 0; | |
1933 | } | |
1934 | ||
1935 | /* | |
1936 | * enable/disable write caching on drive | |
1937 | */ | |
05680d86 PO |
1938 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
1939 | int set) | |
1da177e4 LT |
1940 | { |
1941 | struct packet_command cgc; | |
1942 | struct request_sense sense; | |
1943 | unsigned char buf[64]; | |
1944 | int ret; | |
1945 | ||
1da177e4 LT |
1946 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
1947 | cgc.sense = &sense; | |
1948 | cgc.buflen = pd->mode_offset + 12; | |
1949 | ||
1950 | /* | |
1951 | * caching mode page might not be there, so quiet this command | |
1952 | */ | |
1953 | cgc.quiet = 1; | |
1954 | ||
1955 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
1956 | return ret; | |
1957 | ||
1958 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1959 | ||
1960 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1961 | ret = pkt_mode_select(pd, &cgc); | |
1962 | if (ret) { | |
fa63c0ab | 1963 | pkt_err(pd, "write caching control failed\n"); |
f3ded788 | 1964 | pkt_dump_sense(pd, &cgc); |
1da177e4 | 1965 | } else if (!ret && set) |
ca73dabc | 1966 | pkt_notice(pd, "enabled write caching\n"); |
1da177e4 LT |
1967 | return ret; |
1968 | } | |
1969 | ||
1970 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1971 | { | |
1972 | struct packet_command cgc; | |
1973 | ||
1974 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1975 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1976 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1977 | return pkt_generic_packet(pd, &cgc); | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * Returns drive maximum write speed | |
1982 | */ | |
05680d86 PO |
1983 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
1984 | unsigned *write_speed) | |
1da177e4 LT |
1985 | { |
1986 | struct packet_command cgc; | |
1987 | struct request_sense sense; | |
1988 | unsigned char buf[256+18]; | |
1989 | unsigned char *cap_buf; | |
1990 | int ret, offset; | |
1991 | ||
1da177e4 LT |
1992 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
1993 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
1994 | cgc.sense = &sense; | |
1995 | ||
1996 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1997 | if (ret) { | |
1998 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
1999 | sizeof(struct mode_page_header); | |
2000 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2001 | if (ret) { | |
f3ded788 | 2002 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2003 | return ret; |
2004 | } | |
2005 | } | |
2006 | ||
2007 | offset = 20; /* Obsoleted field, used by older drives */ | |
2008 | if (cap_buf[1] >= 28) | |
2009 | offset = 28; /* Current write speed selected */ | |
2010 | if (cap_buf[1] >= 30) { | |
2011 | /* If the drive reports at least one "Logical Unit Write | |
2012 | * Speed Performance Descriptor Block", use the information | |
2013 | * in the first block. (contains the highest speed) | |
2014 | */ | |
2015 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2016 | if (num_spdb > 0) | |
2017 | offset = 34; | |
2018 | } | |
2019 | ||
2020 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | /* These tables from cdrecord - I don't have orange book */ | |
2025 | /* standard speed CD-RW (1-4x) */ | |
2026 | static char clv_to_speed[16] = { | |
2027 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2028 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2029 | }; | |
2030 | /* high speed CD-RW (-10x) */ | |
2031 | static char hs_clv_to_speed[16] = { | |
2032 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2033 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2034 | }; | |
2035 | /* ultra high speed CD-RW */ | |
2036 | static char us_clv_to_speed[16] = { | |
2037 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2038 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2039 | }; | |
2040 | ||
2041 | /* | |
2042 | * reads the maximum media speed from ATIP | |
2043 | */ | |
05680d86 PO |
2044 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2045 | unsigned *speed) | |
1da177e4 LT |
2046 | { |
2047 | struct packet_command cgc; | |
2048 | struct request_sense sense; | |
2049 | unsigned char buf[64]; | |
2050 | unsigned int size, st, sp; | |
2051 | int ret; | |
2052 | ||
2053 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2054 | cgc.sense = &sense; | |
2055 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2056 | cgc.cmd[1] = 2; | |
2057 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2058 | cgc.cmd[8] = 2; | |
2059 | ret = pkt_generic_packet(pd, &cgc); | |
2060 | if (ret) { | |
f3ded788 | 2061 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2062 | return ret; |
2063 | } | |
2064 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2065 | if (size > sizeof(buf)) | |
2066 | size = sizeof(buf); | |
2067 | ||
2068 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2069 | cgc.sense = &sense; | |
2070 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2071 | cgc.cmd[1] = 2; | |
2072 | cgc.cmd[2] = 4; | |
2073 | cgc.cmd[8] = size; | |
2074 | ret = pkt_generic_packet(pd, &cgc); | |
2075 | if (ret) { | |
f3ded788 | 2076 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2077 | return ret; |
2078 | } | |
2079 | ||
eaa0ff15 | 2080 | if (!(buf[6] & 0x40)) { |
ca73dabc | 2081 | pkt_notice(pd, "disc type is not CD-RW\n"); |
1da177e4 LT |
2082 | return 1; |
2083 | } | |
eaa0ff15 | 2084 | if (!(buf[6] & 0x4)) { |
ca73dabc | 2085 | pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2086 | return 1; |
2087 | } | |
2088 | ||
2089 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2090 | ||
2091 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2092 | ||
2093 | /* Info from cdrecord */ | |
2094 | switch (st) { | |
2095 | case 0: /* standard speed */ | |
2096 | *speed = clv_to_speed[sp]; | |
2097 | break; | |
2098 | case 1: /* high speed */ | |
2099 | *speed = hs_clv_to_speed[sp]; | |
2100 | break; | |
2101 | case 2: /* ultra high speed */ | |
2102 | *speed = us_clv_to_speed[sp]; | |
2103 | break; | |
2104 | default: | |
ca73dabc | 2105 | pkt_notice(pd, "unknown disc sub-type %d\n", st); |
1da177e4 LT |
2106 | return 1; |
2107 | } | |
2108 | if (*speed) { | |
0c075d64 | 2109 | pkt_info(pd, "maximum media speed: %d\n", *speed); |
1da177e4 LT |
2110 | return 0; |
2111 | } else { | |
ca73dabc | 2112 | pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st); |
1da177e4 LT |
2113 | return 1; |
2114 | } | |
2115 | } | |
2116 | ||
05680d86 | 2117 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2118 | { |
2119 | struct packet_command cgc; | |
2120 | struct request_sense sense; | |
2121 | int ret; | |
2122 | ||
844aa797 | 2123 | pkt_dbg(2, pd, "Performing OPC\n"); |
1da177e4 LT |
2124 | |
2125 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2126 | cgc.sense = &sense; | |
2127 | cgc.timeout = 60*HZ; | |
2128 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2129 | cgc.cmd[1] = 1; | |
2130 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
f3ded788 | 2131 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2132 | return ret; |
2133 | } | |
2134 | ||
2135 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2136 | { | |
2137 | int ret; | |
2138 | unsigned int write_speed, media_write_speed, read_speed; | |
2139 | ||
2140 | if ((ret = pkt_probe_settings(pd))) { | |
844aa797 | 2141 | pkt_dbg(2, pd, "failed probe\n"); |
9db91546 | 2142 | return ret; |
1da177e4 LT |
2143 | } |
2144 | ||
2145 | if ((ret = pkt_set_write_settings(pd))) { | |
844aa797 | 2146 | pkt_dbg(1, pd, "failed saving write settings\n"); |
1da177e4 LT |
2147 | return -EIO; |
2148 | } | |
2149 | ||
2150 | pkt_write_caching(pd, USE_WCACHING); | |
2151 | ||
2152 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2153 | write_speed = 16 * 177; | |
2154 | switch (pd->mmc3_profile) { | |
2155 | case 0x13: /* DVD-RW */ | |
2156 | case 0x1a: /* DVD+RW */ | |
2157 | case 0x12: /* DVD-RAM */ | |
844aa797 | 2158 | pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2159 | break; |
2160 | default: | |
2161 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2162 | media_write_speed = 16; | |
2163 | write_speed = min(write_speed, media_write_speed * 177); | |
844aa797 | 2164 | pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2165 | break; |
2166 | } | |
2167 | read_speed = write_speed; | |
2168 | ||
2169 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
844aa797 | 2170 | pkt_dbg(1, pd, "couldn't set write speed\n"); |
1da177e4 LT |
2171 | return -EIO; |
2172 | } | |
2173 | pd->write_speed = write_speed; | |
2174 | pd->read_speed = read_speed; | |
2175 | ||
2176 | if ((ret = pkt_perform_opc(pd))) { | |
844aa797 | 2177 | pkt_dbg(1, pd, "Optimum Power Calibration failed\n"); |
1da177e4 LT |
2178 | } |
2179 | ||
2180 | return 0; | |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * called at open time. | |
2185 | */ | |
aeb5d727 | 2186 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
1da177e4 LT |
2187 | { |
2188 | int ret; | |
2189 | long lba; | |
165125e1 | 2190 | struct request_queue *q; |
1da177e4 LT |
2191 | |
2192 | /* | |
2193 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2194 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2195 | * so bdget() can't fail. | |
2196 | */ | |
2197 | bdget(pd->bdev->bd_dev); | |
e525fd89 | 2198 | if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd))) |
1da177e4 LT |
2199 | goto out; |
2200 | ||
2201 | if ((ret = pkt_get_last_written(pd, &lba))) { | |
fa63c0ab | 2202 | pkt_err(pd, "pkt_get_last_written failed\n"); |
e525fd89 | 2203 | goto out_putdev; |
1da177e4 LT |
2204 | } |
2205 | ||
2206 | set_capacity(pd->disk, lba << 2); | |
2207 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2208 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2209 | ||
2210 | q = bdev_get_queue(pd->bdev); | |
2211 | if (write) { | |
2212 | if ((ret = pkt_open_write(pd))) | |
e525fd89 | 2213 | goto out_putdev; |
1da177e4 LT |
2214 | /* |
2215 | * Some CDRW drives can not handle writes larger than one packet, | |
2216 | * even if the size is a multiple of the packet size. | |
2217 | */ | |
2218 | spin_lock_irq(q->queue_lock); | |
086fa5ff | 2219 | blk_queue_max_hw_sectors(q, pd->settings.size); |
1da177e4 LT |
2220 | spin_unlock_irq(q->queue_lock); |
2221 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2222 | } else { | |
2223 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2224 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2225 | } | |
2226 | ||
2227 | if ((ret = pkt_set_segment_merging(pd, q))) | |
e525fd89 | 2228 | goto out_putdev; |
1da177e4 | 2229 | |
e1bc89bc PO |
2230 | if (write) { |
2231 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
fa63c0ab | 2232 | pkt_err(pd, "not enough memory for buffers\n"); |
e1bc89bc | 2233 | ret = -ENOMEM; |
e525fd89 | 2234 | goto out_putdev; |
e1bc89bc | 2235 | } |
0c075d64 | 2236 | pkt_info(pd, "%lukB available on disc\n", lba << 1); |
e1bc89bc | 2237 | } |
1da177e4 LT |
2238 | |
2239 | return 0; | |
2240 | ||
2241 | out_putdev: | |
e525fd89 | 2242 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
1da177e4 LT |
2243 | out: |
2244 | return ret; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * called when the device is closed. makes sure that the device flushes | |
2249 | * the internal cache before we close. | |
2250 | */ | |
2251 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2252 | { | |
2253 | if (flush && pkt_flush_cache(pd)) | |
844aa797 | 2254 | pkt_dbg(1, pd, "not flushing cache\n"); |
1da177e4 LT |
2255 | |
2256 | pkt_lock_door(pd, 0); | |
2257 | ||
2258 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
e525fd89 | 2259 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
e1bc89bc PO |
2260 | |
2261 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2262 | } |
2263 | ||
252a52aa | 2264 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) |
1da177e4 LT |
2265 | { |
2266 | if (dev_minor >= MAX_WRITERS) | |
2267 | return NULL; | |
2268 | return pkt_devs[dev_minor]; | |
2269 | } | |
2270 | ||
5e5e007c | 2271 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
2272 | { |
2273 | struct pktcdvd_device *pd = NULL; | |
2274 | int ret; | |
2275 | ||
2a48fc0a | 2276 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2277 | mutex_lock(&ctl_mutex); |
5e5e007c | 2278 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
1da177e4 LT |
2279 | if (!pd) { |
2280 | ret = -ENODEV; | |
2281 | goto out; | |
2282 | } | |
2283 | BUG_ON(pd->refcnt < 0); | |
2284 | ||
2285 | pd->refcnt++; | |
46f4e1b7 | 2286 | if (pd->refcnt > 1) { |
5e5e007c | 2287 | if ((mode & FMODE_WRITE) && |
46f4e1b7 PO |
2288 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2289 | ret = -EBUSY; | |
2290 | goto out_dec; | |
2291 | } | |
2292 | } else { | |
5e5e007c | 2293 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
01fd9fda | 2294 | if (ret) |
1da177e4 | 2295 | goto out_dec; |
1da177e4 LT |
2296 | /* |
2297 | * needed here as well, since ext2 (among others) may change | |
2298 | * the blocksize at mount time | |
2299 | */ | |
5e5e007c | 2300 | set_blocksize(bdev, CD_FRAMESIZE); |
1da177e4 LT |
2301 | } |
2302 | ||
1657f824 | 2303 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2304 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2305 | return 0; |
2306 | ||
2307 | out_dec: | |
2308 | pd->refcnt--; | |
2309 | out: | |
1657f824 | 2310 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2311 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2312 | return ret; |
2313 | } | |
2314 | ||
db2a144b | 2315 | static void pkt_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2316 | { |
5e5e007c | 2317 | struct pktcdvd_device *pd = disk->private_data; |
1da177e4 | 2318 | |
2a48fc0a | 2319 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2320 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2321 | pd->refcnt--; |
2322 | BUG_ON(pd->refcnt < 0); | |
2323 | if (pd->refcnt == 0) { | |
2324 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2325 | pkt_release_dev(pd, flush); | |
2326 | } | |
1657f824 | 2327 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2328 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2329 | } |
2330 | ||
2331 | ||
6712ecf8 | 2332 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
1da177e4 LT |
2333 | { |
2334 | struct packet_stacked_data *psd = bio->bi_private; | |
2335 | struct pktcdvd_device *pd = psd->pd; | |
2336 | ||
1da177e4 | 2337 | bio_put(bio); |
6712ecf8 | 2338 | bio_endio(psd->bio, err); |
1da177e4 LT |
2339 | mempool_free(psd, psd_pool); |
2340 | pkt_bio_finished(pd); | |
1da177e4 LT |
2341 | } |
2342 | ||
20d0189b | 2343 | static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 | 2344 | { |
20d0189b KO |
2345 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); |
2346 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2347 | ||
2348 | psd->pd = pd; | |
2349 | psd->bio = bio; | |
2350 | cloned_bio->bi_bdev = pd->bdev; | |
2351 | cloned_bio->bi_private = psd; | |
2352 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2353 | pd->stats.secs_r += bio_sectors(bio); | |
2354 | pkt_queue_bio(pd, cloned_bio); | |
2355 | } | |
2356 | ||
2357 | static void pkt_make_request_write(struct request_queue *q, struct bio *bio) | |
2358 | { | |
2359 | struct pktcdvd_device *pd = q->queuedata; | |
1da177e4 LT |
2360 | sector_t zone; |
2361 | struct packet_data *pkt; | |
2362 | int was_empty, blocked_bio; | |
2363 | struct pkt_rb_node *node; | |
2364 | ||
4f024f37 | 2365 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 LT |
2366 | |
2367 | /* | |
2368 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2369 | * just append this bio to that packet. | |
2370 | */ | |
2371 | spin_lock(&pd->cdrw.active_list_lock); | |
2372 | blocked_bio = 0; | |
2373 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2374 | if (pkt->sector == zone) { | |
2375 | spin_lock(&pkt->lock); | |
2376 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2377 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
c5ecc484 | 2378 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 KO |
2379 | pkt->write_size += |
2380 | bio->bi_iter.bi_size / CD_FRAMESIZE; | |
1da177e4 LT |
2381 | if ((pkt->write_size >= pkt->frames) && |
2382 | (pkt->state == PACKET_WAITING_STATE)) { | |
2383 | atomic_inc(&pkt->run_sm); | |
2384 | wake_up(&pd->wqueue); | |
2385 | } | |
2386 | spin_unlock(&pkt->lock); | |
2387 | spin_unlock(&pd->cdrw.active_list_lock); | |
5a7bbad2 | 2388 | return; |
1da177e4 LT |
2389 | } else { |
2390 | blocked_bio = 1; | |
2391 | } | |
2392 | spin_unlock(&pkt->lock); | |
2393 | } | |
2394 | } | |
2395 | spin_unlock(&pd->cdrw.active_list_lock); | |
2396 | ||
0a0fc960 TM |
2397 | /* |
2398 | * Test if there is enough room left in the bio work queue | |
2399 | * (queue size >= congestion on mark). | |
2400 | * If not, wait till the work queue size is below the congestion off mark. | |
2401 | */ | |
2402 | spin_lock(&pd->lock); | |
2403 | if (pd->write_congestion_on > 0 | |
2404 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
8aa7e847 | 2405 | set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC); |
0a0fc960 TM |
2406 | do { |
2407 | spin_unlock(&pd->lock); | |
8aa7e847 | 2408 | congestion_wait(BLK_RW_ASYNC, HZ); |
0a0fc960 TM |
2409 | spin_lock(&pd->lock); |
2410 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2411 | } | |
2412 | spin_unlock(&pd->lock); | |
2413 | ||
1da177e4 LT |
2414 | /* |
2415 | * No matching packet found. Store the bio in the work queue. | |
2416 | */ | |
2417 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2418 | node->bio = bio; |
2419 | spin_lock(&pd->lock); | |
2420 | BUG_ON(pd->bio_queue_size < 0); | |
2421 | was_empty = (pd->bio_queue_size == 0); | |
2422 | pkt_rbtree_insert(pd, node); | |
2423 | spin_unlock(&pd->lock); | |
2424 | ||
2425 | /* | |
2426 | * Wake up the worker thread. | |
2427 | */ | |
2428 | atomic_set(&pd->scan_queue, 1); | |
2429 | if (was_empty) { | |
2430 | /* This wake_up is required for correct operation */ | |
2431 | wake_up(&pd->wqueue); | |
2432 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2433 | /* | |
2434 | * This wake up is not required for correct operation, | |
2435 | * but improves performance in some cases. | |
2436 | */ | |
2437 | wake_up(&pd->wqueue); | |
2438 | } | |
20d0189b KO |
2439 | } |
2440 | ||
2441 | static void pkt_make_request(struct request_queue *q, struct bio *bio) | |
2442 | { | |
2443 | struct pktcdvd_device *pd; | |
2444 | char b[BDEVNAME_SIZE]; | |
2445 | struct bio *split; | |
2446 | ||
2447 | pd = q->queuedata; | |
2448 | if (!pd) { | |
2449 | pr_err("%s incorrect request queue\n", | |
2450 | bdevname(bio->bi_bdev, b)); | |
2451 | goto end_io; | |
2452 | } | |
2453 | ||
2454 | pkt_dbg(2, pd, "start = %6llx stop = %6llx\n", | |
2455 | (unsigned long long)bio->bi_iter.bi_sector, | |
2456 | (unsigned long long)bio_end_sector(bio)); | |
2457 | ||
2458 | /* | |
2459 | * Clone READ bios so we can have our own bi_end_io callback. | |
2460 | */ | |
2461 | if (bio_data_dir(bio) == READ) { | |
2462 | pkt_make_request_read(pd, bio); | |
2463 | return; | |
2464 | } | |
2465 | ||
2466 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2467 | pkt_notice(pd, "WRITE for ro device (%llu)\n", | |
2468 | (unsigned long long)bio->bi_iter.bi_sector); | |
2469 | goto end_io; | |
2470 | } | |
2471 | ||
2472 | if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) { | |
2473 | pkt_err(pd, "wrong bio size\n"); | |
2474 | goto end_io; | |
2475 | } | |
2476 | ||
2477 | blk_queue_bounce(q, &bio); | |
2478 | ||
2479 | do { | |
2480 | sector_t zone = get_zone(bio->bi_iter.bi_sector, pd); | |
2481 | sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd); | |
2482 | ||
2483 | if (last_zone != zone) { | |
2484 | BUG_ON(last_zone != zone + pd->settings.size); | |
2485 | ||
2486 | split = bio_split(bio, last_zone - | |
2487 | bio->bi_iter.bi_sector, | |
2488 | GFP_NOIO, fs_bio_set); | |
2489 | bio_chain(split, bio); | |
2490 | } else { | |
2491 | split = bio; | |
2492 | } | |
2493 | ||
2494 | pkt_make_request_write(q, split); | |
2495 | } while (split != bio); | |
2496 | ||
5a7bbad2 | 2497 | return; |
1da177e4 | 2498 | end_io: |
6712ecf8 | 2499 | bio_io_error(bio); |
1da177e4 LT |
2500 | } |
2501 | ||
2502 | ||
2503 | ||
cc371e66 AK |
2504 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2505 | struct bio_vec *bvec) | |
1da177e4 LT |
2506 | { |
2507 | struct pktcdvd_device *pd = q->queuedata; | |
5323fb77 | 2508 | sector_t zone = get_zone(bmd->bi_sector, pd); |
cc371e66 | 2509 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; |
1da177e4 LT |
2510 | int remaining = (pd->settings.size << 9) - used; |
2511 | int remaining2; | |
2512 | ||
2513 | /* | |
2514 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2515 | * boundary, pkt_make_request() will split the bio. | |
2516 | */ | |
cc371e66 | 2517 | remaining2 = PAGE_SIZE - bmd->bi_size; |
1da177e4 LT |
2518 | remaining = max(remaining, remaining2); |
2519 | ||
2520 | BUG_ON(remaining < 0); | |
2521 | return remaining; | |
2522 | } | |
2523 | ||
2524 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2525 | { | |
165125e1 | 2526 | struct request_queue *q = pd->disk->queue; |
1da177e4 LT |
2527 | |
2528 | blk_queue_make_request(q, pkt_make_request); | |
e1defc4f | 2529 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
086fa5ff | 2530 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
1da177e4 LT |
2531 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
2532 | q->queuedata = pd; | |
2533 | } | |
2534 | ||
2535 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2536 | { | |
2537 | struct pktcdvd_device *pd = m->private; | |
2538 | char *msg; | |
2539 | char bdev_buf[BDEVNAME_SIZE]; | |
2540 | int states[PACKET_NUM_STATES]; | |
2541 | ||
2542 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2543 | bdevname(pd->bdev, bdev_buf)); | |
2544 | ||
2545 | seq_printf(m, "\nSettings:\n"); | |
2546 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2547 | ||
2548 | if (pd->settings.write_type == 0) | |
2549 | msg = "Packet"; | |
2550 | else | |
2551 | msg = "Unknown"; | |
2552 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2553 | ||
2554 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2555 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2556 | ||
2557 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2558 | ||
2559 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2560 | msg = "Mode 1"; | |
2561 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2562 | msg = "Mode 2"; | |
2563 | else | |
2564 | msg = "Unknown"; | |
2565 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2566 | ||
2567 | seq_printf(m, "\nStatistics:\n"); | |
2568 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2569 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2570 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2571 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2572 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2573 | ||
2574 | seq_printf(m, "\nMisc:\n"); | |
2575 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2576 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2577 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2578 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2579 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2580 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2581 | ||
2582 | seq_printf(m, "\nQueue state:\n"); | |
2583 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2584 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2585 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2586 | ||
2587 | pkt_count_states(pd, states); | |
2588 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2589 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2590 | ||
0a0fc960 TM |
2591 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2592 | pd->write_congestion_off, | |
2593 | pd->write_congestion_on); | |
1da177e4 LT |
2594 | return 0; |
2595 | } | |
2596 | ||
2597 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2598 | { | |
d9dda78b | 2599 | return single_open(file, pkt_seq_show, PDE_DATA(inode)); |
1da177e4 LT |
2600 | } |
2601 | ||
2b8693c0 | 2602 | static const struct file_operations pkt_proc_fops = { |
1da177e4 LT |
2603 | .open = pkt_seq_open, |
2604 | .read = seq_read, | |
2605 | .llseek = seq_lseek, | |
2606 | .release = single_release | |
2607 | }; | |
2608 | ||
2609 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2610 | { | |
2611 | int i; | |
2612 | int ret = 0; | |
2613 | char b[BDEVNAME_SIZE]; | |
1da177e4 LT |
2614 | struct block_device *bdev; |
2615 | ||
2616 | if (pd->pkt_dev == dev) { | |
fa63c0ab | 2617 | pkt_err(pd, "recursive setup not allowed\n"); |
1da177e4 LT |
2618 | return -EBUSY; |
2619 | } | |
2620 | for (i = 0; i < MAX_WRITERS; i++) { | |
2621 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2622 | if (!pd2) | |
2623 | continue; | |
2624 | if (pd2->bdev->bd_dev == dev) { | |
fa63c0ab JP |
2625 | pkt_err(pd, "%s already setup\n", |
2626 | bdevname(pd2->bdev, b)); | |
1da177e4 LT |
2627 | return -EBUSY; |
2628 | } | |
2629 | if (pd2->pkt_dev == dev) { | |
fa63c0ab | 2630 | pkt_err(pd, "can't chain pktcdvd devices\n"); |
1da177e4 LT |
2631 | return -EBUSY; |
2632 | } | |
2633 | } | |
2634 | ||
2635 | bdev = bdget(dev); | |
2636 | if (!bdev) | |
2637 | return -ENOMEM; | |
e525fd89 | 2638 | ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); |
1da177e4 LT |
2639 | if (ret) |
2640 | return ret; | |
2641 | ||
2642 | /* This is safe, since we have a reference from open(). */ | |
2643 | __module_get(THIS_MODULE); | |
2644 | ||
1da177e4 LT |
2645 | pd->bdev = bdev; |
2646 | set_blocksize(bdev, CD_FRAMESIZE); | |
2647 | ||
2648 | pkt_init_queue(pd); | |
2649 | ||
2650 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2651 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2652 | if (IS_ERR(pd->cdrw.thread)) { | |
fa63c0ab | 2653 | pkt_err(pd, "can't start kernel thread\n"); |
1da177e4 | 2654 | ret = -ENOMEM; |
e1bc89bc | 2655 | goto out_mem; |
1da177e4 LT |
2656 | } |
2657 | ||
c7705f34 | 2658 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
844aa797 | 2659 | pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b)); |
1da177e4 LT |
2660 | return 0; |
2661 | ||
1da177e4 | 2662 | out_mem: |
2cbed890 | 2663 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 LT |
2664 | /* This is safe: open() is still holding a reference. */ |
2665 | module_put(THIS_MODULE); | |
2666 | return ret; | |
2667 | } | |
2668 | ||
5e5e007c | 2669 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
1da177e4 | 2670 | { |
5e5e007c | 2671 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
8a6cfeb6 | 2672 | int ret; |
1da177e4 | 2673 | |
844aa797 | 2674 | pkt_dbg(2, pd, "cmd %x, dev %d:%d\n", |
cd3f2cd0 | 2675 | cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
1da177e4 | 2676 | |
2a48fc0a | 2677 | mutex_lock(&pktcdvd_mutex); |
1da177e4 | 2678 | switch (cmd) { |
a0eb62a0 AV |
2679 | case CDROMEJECT: |
2680 | /* | |
2681 | * The door gets locked when the device is opened, so we | |
2682 | * have to unlock it or else the eject command fails. | |
2683 | */ | |
2684 | if (pd->refcnt == 1) | |
2685 | pkt_lock_door(pd, 0); | |
2686 | /* fallthru */ | |
1da177e4 LT |
2687 | /* |
2688 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2689 | */ | |
2690 | case CDROMMULTISESSION: | |
2691 | case CDROMREADTOCENTRY: | |
2692 | case CDROM_LAST_WRITTEN: | |
2693 | case CDROM_SEND_PACKET: | |
2694 | case SCSI_IOCTL_SEND_COMMAND: | |
8a6cfeb6 AB |
2695 | ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg); |
2696 | break; | |
1da177e4 LT |
2697 | |
2698 | default: | |
844aa797 | 2699 | pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd); |
8a6cfeb6 | 2700 | ret = -ENOTTY; |
1da177e4 | 2701 | } |
2a48fc0a | 2702 | mutex_unlock(&pktcdvd_mutex); |
8560c650 | 2703 | |
8a6cfeb6 | 2704 | return ret; |
1da177e4 LT |
2705 | } |
2706 | ||
3c0d2060 TH |
2707 | static unsigned int pkt_check_events(struct gendisk *disk, |
2708 | unsigned int clearing) | |
1da177e4 LT |
2709 | { |
2710 | struct pktcdvd_device *pd = disk->private_data; | |
2711 | struct gendisk *attached_disk; | |
2712 | ||
2713 | if (!pd) | |
2714 | return 0; | |
2715 | if (!pd->bdev) | |
2716 | return 0; | |
2717 | attached_disk = pd->bdev->bd_disk; | |
3c0d2060 | 2718 | if (!attached_disk || !attached_disk->fops->check_events) |
1da177e4 | 2719 | return 0; |
3c0d2060 | 2720 | return attached_disk->fops->check_events(attached_disk, clearing); |
1da177e4 LT |
2721 | } |
2722 | ||
83d5cde4 | 2723 | static const struct block_device_operations pktcdvd_ops = { |
1da177e4 | 2724 | .owner = THIS_MODULE, |
5e5e007c AV |
2725 | .open = pkt_open, |
2726 | .release = pkt_close, | |
8a6cfeb6 | 2727 | .ioctl = pkt_ioctl, |
3c0d2060 | 2728 | .check_events = pkt_check_events, |
1da177e4 LT |
2729 | }; |
2730 | ||
2c9ede55 | 2731 | static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode) |
b03f38b6 KS |
2732 | { |
2733 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); | |
2734 | } | |
2735 | ||
1da177e4 LT |
2736 | /* |
2737 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2738 | */ | |
adb9250a | 2739 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2740 | { |
2741 | int idx; | |
2742 | int ret = -ENOMEM; | |
2743 | struct pktcdvd_device *pd; | |
2744 | struct gendisk *disk; | |
adb9250a TM |
2745 | |
2746 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2747 | |
2748 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2749 | if (!pkt_devs[idx]) | |
2750 | break; | |
2751 | if (idx == MAX_WRITERS) { | |
99481334 | 2752 | pr_err("max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2753 | ret = -EBUSY; |
2754 | goto out_mutex; | |
1da177e4 LT |
2755 | } |
2756 | ||
1107d2e0 | 2757 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2758 | if (!pd) |
adb9250a | 2759 | goto out_mutex; |
1da177e4 | 2760 | |
0eaae62a MD |
2761 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2762 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2763 | if (!pd->rb_pool) |
2764 | goto out_mem; | |
2765 | ||
e1bc89bc PO |
2766 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2767 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2768 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2769 | ||
1da177e4 LT |
2770 | spin_lock_init(&pd->lock); |
2771 | spin_lock_init(&pd->iosched.lock); | |
c5ecc484 AM |
2772 | bio_list_init(&pd->iosched.read_queue); |
2773 | bio_list_init(&pd->iosched.write_queue); | |
7822082d | 2774 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2775 | init_waitqueue_head(&pd->wqueue); |
2776 | pd->bio_queue = RB_ROOT; | |
2777 | ||
0a0fc960 TM |
2778 | pd->write_congestion_on = write_congestion_on; |
2779 | pd->write_congestion_off = write_congestion_off; | |
2780 | ||
adb9250a TM |
2781 | disk = alloc_disk(1); |
2782 | if (!disk) | |
2783 | goto out_mem; | |
2784 | pd->disk = disk; | |
add21660 | 2785 | disk->major = pktdev_major; |
1da177e4 LT |
2786 | disk->first_minor = idx; |
2787 | disk->fops = &pktcdvd_ops; | |
2788 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2789 | strcpy(disk->disk_name, pd->name); |
e454cea2 | 2790 | disk->devnode = pktcdvd_devnode; |
1da177e4 LT |
2791 | disk->private_data = pd; |
2792 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2793 | if (!disk->queue) | |
2794 | goto out_mem2; | |
2795 | ||
f331c029 | 2796 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2797 | ret = pkt_new_dev(pd, dev); |
2798 | if (ret) | |
2799 | goto out_new_dev; | |
2800 | ||
3c0d2060 TH |
2801 | /* inherit events of the host device */ |
2802 | disk->events = pd->bdev->bd_disk->events; | |
2803 | disk->async_events = pd->bdev->bd_disk->async_events; | |
2804 | ||
1da177e4 | 2805 | add_disk(disk); |
adb9250a | 2806 | |
32694850 TM |
2807 | pkt_sysfs_dev_new(pd); |
2808 | pkt_debugfs_dev_new(pd); | |
2809 | ||
1da177e4 | 2810 | pkt_devs[idx] = pd; |
adb9250a TM |
2811 | if (pkt_dev) |
2812 | *pkt_dev = pd->pkt_dev; | |
2813 | ||
2814 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2815 | return 0; |
2816 | ||
2817 | out_new_dev: | |
1312f40e | 2818 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2819 | out_mem2: |
2820 | put_disk(disk); | |
2821 | out_mem: | |
2822 | if (pd->rb_pool) | |
2823 | mempool_destroy(pd->rb_pool); | |
2824 | kfree(pd); | |
adb9250a TM |
2825 | out_mutex: |
2826 | mutex_unlock(&ctl_mutex); | |
99481334 | 2827 | pr_err("setup of pktcdvd device failed\n"); |
1da177e4 LT |
2828 | return ret; |
2829 | } | |
2830 | ||
2831 | /* | |
2832 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2833 | */ | |
adb9250a | 2834 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2835 | { |
2836 | struct pktcdvd_device *pd; | |
2837 | int idx; | |
adb9250a TM |
2838 | int ret = 0; |
2839 | ||
2840 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2841 | |
2842 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2843 | pd = pkt_devs[idx]; | |
2844 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2845 | break; | |
2846 | } | |
2847 | if (idx == MAX_WRITERS) { | |
666dc7c9 | 2848 | pr_debug("dev not setup\n"); |
adb9250a TM |
2849 | ret = -ENXIO; |
2850 | goto out; | |
1da177e4 LT |
2851 | } |
2852 | ||
adb9250a TM |
2853 | if (pd->refcnt > 0) { |
2854 | ret = -EBUSY; | |
2855 | goto out; | |
2856 | } | |
1da177e4 LT |
2857 | if (!IS_ERR(pd->cdrw.thread)) |
2858 | kthread_stop(pd->cdrw.thread); | |
2859 | ||
32694850 TM |
2860 | pkt_devs[idx] = NULL; |
2861 | ||
2862 | pkt_debugfs_dev_remove(pd); | |
2863 | pkt_sysfs_dev_remove(pd); | |
2864 | ||
2cbed890 | 2865 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 | 2866 | |
1da177e4 | 2867 | remove_proc_entry(pd->name, pkt_proc); |
844aa797 | 2868 | pkt_dbg(1, pd, "writer unmapped\n"); |
1da177e4 LT |
2869 | |
2870 | del_gendisk(pd->disk); | |
1312f40e | 2871 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2872 | put_disk(pd->disk); |
2873 | ||
1da177e4 LT |
2874 | mempool_destroy(pd->rb_pool); |
2875 | kfree(pd); | |
2876 | ||
2877 | /* This is safe: open() is still holding a reference. */ | |
2878 | module_put(THIS_MODULE); | |
adb9250a TM |
2879 | |
2880 | out: | |
2881 | mutex_unlock(&ctl_mutex); | |
2882 | return ret; | |
1da177e4 LT |
2883 | } |
2884 | ||
2885 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2886 | { | |
adb9250a TM |
2887 | struct pktcdvd_device *pd; |
2888 | ||
2889 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2890 | ||
2891 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2892 | if (pd) { |
2893 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2894 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2895 | } else { | |
2896 | ctrl_cmd->dev = 0; | |
2897 | ctrl_cmd->pkt_dev = 0; | |
2898 | } | |
2899 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2900 | |
2901 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2902 | } |
2903 | ||
f80a0ca6 | 2904 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
2905 | { |
2906 | void __user *argp = (void __user *)arg; | |
2907 | struct pkt_ctrl_command ctrl_cmd; | |
2908 | int ret = 0; | |
adb9250a | 2909 | dev_t pkt_dev = 0; |
1da177e4 LT |
2910 | |
2911 | if (cmd != PACKET_CTRL_CMD) | |
2912 | return -ENOTTY; | |
2913 | ||
2914 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2915 | return -EFAULT; | |
2916 | ||
2917 | switch (ctrl_cmd.command) { | |
2918 | case PKT_CTRL_CMD_SETUP: | |
2919 | if (!capable(CAP_SYS_ADMIN)) | |
2920 | return -EPERM; | |
adb9250a TM |
2921 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
2922 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
2923 | break; |
2924 | case PKT_CTRL_CMD_TEARDOWN: | |
2925 | if (!capable(CAP_SYS_ADMIN)) | |
2926 | return -EPERM; | |
adb9250a | 2927 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
2928 | break; |
2929 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 2930 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
2931 | break; |
2932 | default: | |
2933 | return -ENOTTY; | |
2934 | } | |
2935 | ||
2936 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2937 | return -EFAULT; | |
2938 | return ret; | |
2939 | } | |
2940 | ||
f80a0ca6 AB |
2941 | #ifdef CONFIG_COMPAT |
2942 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2943 | { | |
2944 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
2945 | } | |
2946 | #endif | |
1da177e4 | 2947 | |
2b8693c0 | 2948 | static const struct file_operations pkt_ctl_fops = { |
f80a0ca6 AB |
2949 | .open = nonseekable_open, |
2950 | .unlocked_ioctl = pkt_ctl_ioctl, | |
2951 | #ifdef CONFIG_COMPAT | |
2952 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
2953 | #endif | |
2954 | .owner = THIS_MODULE, | |
6038f373 | 2955 | .llseek = no_llseek, |
1da177e4 LT |
2956 | }; |
2957 | ||
2958 | static struct miscdevice pkt_misc = { | |
2959 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 2960 | .name = DRIVER_NAME, |
e454cea2 | 2961 | .nodename = "pktcdvd/control", |
1da177e4 LT |
2962 | .fops = &pkt_ctl_fops |
2963 | }; | |
2964 | ||
2965 | static int __init pkt_init(void) | |
2966 | { | |
2967 | int ret; | |
2968 | ||
32694850 TM |
2969 | mutex_init(&ctl_mutex); |
2970 | ||
0eaae62a MD |
2971 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
2972 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
2973 | if (!psd_pool) |
2974 | return -ENOMEM; | |
2975 | ||
add21660 | 2976 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2977 | if (ret < 0) { |
99481334 | 2978 | pr_err("unable to register block device\n"); |
1da177e4 LT |
2979 | goto out2; |
2980 | } | |
add21660 TM |
2981 | if (!pktdev_major) |
2982 | pktdev_major = ret; | |
1da177e4 | 2983 | |
32694850 TM |
2984 | ret = pkt_sysfs_init(); |
2985 | if (ret) | |
2986 | goto out; | |
2987 | ||
2988 | pkt_debugfs_init(); | |
2989 | ||
1da177e4 LT |
2990 | ret = misc_register(&pkt_misc); |
2991 | if (ret) { | |
99481334 | 2992 | pr_err("unable to register misc device\n"); |
32694850 | 2993 | goto out_misc; |
1da177e4 LT |
2994 | } |
2995 | ||
928b4d8c | 2996 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2997 | |
1da177e4 LT |
2998 | return 0; |
2999 | ||
32694850 TM |
3000 | out_misc: |
3001 | pkt_debugfs_cleanup(); | |
3002 | pkt_sysfs_cleanup(); | |
1da177e4 | 3003 | out: |
add21660 | 3004 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3005 | out2: |
3006 | mempool_destroy(psd_pool); | |
3007 | return ret; | |
3008 | } | |
3009 | ||
3010 | static void __exit pkt_exit(void) | |
3011 | { | |
928b4d8c | 3012 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3013 | misc_deregister(&pkt_misc); |
32694850 TM |
3014 | |
3015 | pkt_debugfs_cleanup(); | |
3016 | pkt_sysfs_cleanup(); | |
3017 | ||
add21660 | 3018 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3019 | mempool_destroy(psd_pool); |
3020 | } | |
3021 | ||
3022 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3023 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3024 | MODULE_LICENSE("GPL"); | |
3025 | ||
3026 | module_init(pkt_init); | |
3027 | module_exit(pkt_exit); |