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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); | |
a492f075 JL |
707 | if (IS_ERR(rq)) |
708 | return PTR_ERR(rq); | |
f27b087b | 709 | blk_rq_set_block_pc(rq); |
406c9b60 CH |
710 | |
711 | if (cgc->buflen) { | |
8586ea96 JL |
712 | ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, |
713 | __GFP_WAIT); | |
714 | if (ret) | |
406c9b60 CH |
715 | goto out; |
716 | } | |
1da177e4 | 717 | |
91e4ee38 | 718 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
406c9b60 | 719 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
1da177e4 | 720 | |
1da177e4 | 721 | rq->timeout = 60*HZ; |
1da177e4 | 722 | if (cgc->quiet) |
4aff5e23 | 723 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 | 724 | |
406c9b60 | 725 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
cbc31a47 AM |
726 | if (rq->errors) |
727 | ret = -EIO; | |
406c9b60 | 728 | out: |
1da177e4 | 729 | blk_put_request(rq); |
406c9b60 | 730 | return ret; |
1da177e4 LT |
731 | } |
732 | ||
99481334 JP |
733 | static const char *sense_key_string(__u8 index) |
734 | { | |
735 | static const char * const info[] = { | |
736 | "No sense", "Recovered error", "Not ready", | |
737 | "Medium error", "Hardware error", "Illegal request", | |
738 | "Unit attention", "Data protect", "Blank check", | |
739 | }; | |
740 | ||
741 | return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; | |
742 | } | |
743 | ||
1da177e4 LT |
744 | /* |
745 | * A generic sense dump / resolve mechanism should be implemented across | |
746 | * all ATAPI + SCSI devices. | |
747 | */ | |
f3ded788 JP |
748 | static void pkt_dump_sense(struct pktcdvd_device *pd, |
749 | struct packet_command *cgc) | |
1da177e4 | 750 | { |
1da177e4 LT |
751 | struct request_sense *sense = cgc->sense; |
752 | ||
99481334 | 753 | if (sense) |
f3ded788 JP |
754 | pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n", |
755 | CDROM_PACKET_SIZE, cgc->cmd, | |
756 | sense->sense_key, sense->asc, sense->ascq, | |
757 | sense_key_string(sense->sense_key)); | |
99481334 | 758 | else |
f3ded788 | 759 | pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd); |
1da177e4 LT |
760 | } |
761 | ||
762 | /* | |
763 | * flush the drive cache to media | |
764 | */ | |
765 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
766 | { | |
767 | struct packet_command cgc; | |
768 | ||
769 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
770 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
771 | cgc.quiet = 1; | |
772 | ||
773 | /* | |
774 | * the IMMED bit -- we default to not setting it, although that | |
775 | * would allow a much faster close, this is safer | |
776 | */ | |
777 | #if 0 | |
778 | cgc.cmd[1] = 1 << 1; | |
779 | #endif | |
780 | return pkt_generic_packet(pd, &cgc); | |
781 | } | |
782 | ||
783 | /* | |
784 | * speed is given as the normal factor, e.g. 4 for 4x | |
785 | */ | |
05680d86 PO |
786 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
787 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
788 | { |
789 | struct packet_command cgc; | |
790 | struct request_sense sense; | |
791 | int ret; | |
792 | ||
793 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
794 | cgc.sense = &sense; | |
795 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
796 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
797 | cgc.cmd[3] = read_speed & 0xff; | |
798 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
799 | cgc.cmd[5] = write_speed & 0xff; | |
800 | ||
801 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
f3ded788 | 802 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
803 | |
804 | return ret; | |
805 | } | |
806 | ||
807 | /* | |
808 | * Queue a bio for processing by the low-level CD device. Must be called | |
809 | * from process context. | |
810 | */ | |
46c271be | 811 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
812 | { |
813 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
814 | if (bio_data_dir(bio) == READ) |
815 | bio_list_add(&pd->iosched.read_queue, bio); | |
816 | else | |
817 | bio_list_add(&pd->iosched.write_queue, bio); | |
1da177e4 LT |
818 | spin_unlock(&pd->iosched.lock); |
819 | ||
820 | atomic_set(&pd->iosched.attention, 1); | |
821 | wake_up(&pd->wqueue); | |
822 | } | |
823 | ||
824 | /* | |
825 | * Process the queued read/write requests. This function handles special | |
826 | * requirements for CDRW drives: | |
827 | * - A cache flush command must be inserted before a read request if the | |
828 | * previous request was a write. | |
46c271be | 829 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 830 | * than necessary. |
46c271be PO |
831 | * - Optimize for throughput at the expense of latency. This means that streaming |
832 | * writes will never be interrupted by a read, but if the drive has to seek | |
833 | * before the next write, switch to reading instead if there are any pending | |
834 | * read requests. | |
1da177e4 LT |
835 | * - Set the read speed according to current usage pattern. When only reading |
836 | * from the device, it's best to use the highest possible read speed, but | |
837 | * when switching often between reading and writing, it's better to have the | |
838 | * same read and write speeds. | |
1da177e4 LT |
839 | */ |
840 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
841 | { | |
1da177e4 LT |
842 | |
843 | if (atomic_read(&pd->iosched.attention) == 0) | |
844 | return; | |
845 | atomic_set(&pd->iosched.attention, 0); | |
846 | ||
1da177e4 LT |
847 | for (;;) { |
848 | struct bio *bio; | |
46c271be | 849 | int reads_queued, writes_queued; |
1da177e4 LT |
850 | |
851 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
852 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
853 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
1da177e4 LT |
854 | spin_unlock(&pd->iosched.lock); |
855 | ||
856 | if (!reads_queued && !writes_queued) | |
857 | break; | |
858 | ||
859 | if (pd->iosched.writing) { | |
46c271be PO |
860 | int need_write_seek = 1; |
861 | spin_lock(&pd->iosched.lock); | |
c5ecc484 | 862 | bio = bio_list_peek(&pd->iosched.write_queue); |
46c271be | 863 | spin_unlock(&pd->iosched.lock); |
4f024f37 KO |
864 | if (bio && (bio->bi_iter.bi_sector == |
865 | pd->iosched.last_write)) | |
46c271be PO |
866 | need_write_seek = 0; |
867 | if (need_write_seek && reads_queued) { | |
1da177e4 | 868 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
844aa797 | 869 | pkt_dbg(2, pd, "write, waiting\n"); |
1da177e4 LT |
870 | break; |
871 | } | |
872 | pkt_flush_cache(pd); | |
873 | pd->iosched.writing = 0; | |
874 | } | |
875 | } else { | |
876 | if (!reads_queued && writes_queued) { | |
877 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
844aa797 | 878 | pkt_dbg(2, pd, "read, waiting\n"); |
1da177e4 LT |
879 | break; |
880 | } | |
881 | pd->iosched.writing = 1; | |
882 | } | |
883 | } | |
884 | ||
885 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
886 | if (pd->iosched.writing) |
887 | bio = bio_list_pop(&pd->iosched.write_queue); | |
888 | else | |
889 | bio = bio_list_pop(&pd->iosched.read_queue); | |
1da177e4 LT |
890 | spin_unlock(&pd->iosched.lock); |
891 | ||
892 | if (!bio) | |
893 | continue; | |
894 | ||
895 | if (bio_data_dir(bio) == READ) | |
4f024f37 KO |
896 | pd->iosched.successive_reads += |
897 | bio->bi_iter.bi_size >> 10; | |
46c271be | 898 | else { |
1da177e4 | 899 | pd->iosched.successive_reads = 0; |
f73a1c7d | 900 | pd->iosched.last_write = bio_end_sector(bio); |
46c271be | 901 | } |
1da177e4 LT |
902 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
903 | if (pd->read_speed == pd->write_speed) { | |
904 | pd->read_speed = MAX_SPEED; | |
905 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
906 | } | |
907 | } else { | |
908 | if (pd->read_speed != pd->write_speed) { | |
909 | pd->read_speed = pd->write_speed; | |
910 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
911 | } | |
912 | } | |
913 | ||
914 | atomic_inc(&pd->cdrw.pending_bios); | |
915 | generic_make_request(bio); | |
916 | } | |
917 | } | |
918 | ||
919 | /* | |
920 | * Special care is needed if the underlying block device has a small | |
921 | * max_phys_segments value. | |
922 | */ | |
165125e1 | 923 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 | 924 | { |
ae03bf63 | 925 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
8a78362c | 926 | <= queue_max_segments(q)) { |
1da177e4 LT |
927 | /* |
928 | * The cdrom device can handle one segment/frame | |
929 | */ | |
930 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
931 | return 0; | |
ae03bf63 | 932 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
8a78362c | 933 | <= queue_max_segments(q)) { |
1da177e4 LT |
934 | /* |
935 | * We can handle this case at the expense of some extra memory | |
936 | * copies during write operations | |
937 | */ | |
938 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
939 | return 0; | |
940 | } else { | |
fa63c0ab | 941 | pkt_err(pd, "cdrom max_phys_segments too small\n"); |
1da177e4 LT |
942 | return -EIO; |
943 | } | |
944 | } | |
945 | ||
1da177e4 LT |
946 | /* |
947 | * Copy all data for this packet to pkt->pages[], so that | |
948 | * a) The number of required segments for the write bio is minimized, which | |
949 | * is necessary for some scsi controllers. | |
950 | * b) The data can be used as cache to avoid read requests if we receive a | |
951 | * new write request for the same zone. | |
952 | */ | |
72772323 | 953 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
954 | { |
955 | int f, p, offs; | |
956 | ||
957 | /* Copy all data to pkt->pages[] */ | |
958 | p = 0; | |
959 | offs = 0; | |
960 | for (f = 0; f < pkt->frames; f++) { | |
72772323 | 961 | if (bvec[f].bv_page != pkt->pages[p]) { |
cfd8005c | 962 | void *vfrom = kmap_atomic(bvec[f].bv_page) + bvec[f].bv_offset; |
1da177e4 LT |
963 | void *vto = page_address(pkt->pages[p]) + offs; |
964 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
cfd8005c | 965 | kunmap_atomic(vfrom); |
72772323 PO |
966 | bvec[f].bv_page = pkt->pages[p]; |
967 | bvec[f].bv_offset = offs; | |
1da177e4 | 968 | } else { |
72772323 | 969 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
970 | } |
971 | offs += CD_FRAMESIZE; | |
972 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
973 | offs = 0; |
974 | p++; | |
975 | } | |
976 | } | |
977 | } | |
978 | ||
6712ecf8 | 979 | static void pkt_end_io_read(struct bio *bio, int err) |
1da177e4 LT |
980 | { |
981 | struct packet_data *pkt = bio->bi_private; | |
982 | struct pktcdvd_device *pd = pkt->pd; | |
983 | BUG_ON(!pd); | |
984 | ||
844aa797 | 985 | pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n", |
cd3f2cd0 | 986 | bio, (unsigned long long)pkt->sector, |
4f024f37 | 987 | (unsigned long long)bio->bi_iter.bi_sector, err); |
1da177e4 LT |
988 | |
989 | if (err) | |
990 | atomic_inc(&pkt->io_errors); | |
991 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
992 | atomic_inc(&pkt->run_sm); | |
993 | wake_up(&pd->wqueue); | |
994 | } | |
995 | pkt_bio_finished(pd); | |
1da177e4 LT |
996 | } |
997 | ||
6712ecf8 | 998 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
1da177e4 LT |
999 | { |
1000 | struct packet_data *pkt = bio->bi_private; | |
1001 | struct pktcdvd_device *pd = pkt->pd; | |
1002 | BUG_ON(!pd); | |
1003 | ||
844aa797 | 1004 | pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, err); |
1da177e4 LT |
1005 | |
1006 | pd->stats.pkt_ended++; | |
1007 | ||
1008 | pkt_bio_finished(pd); | |
1009 | atomic_dec(&pkt->io_wait); | |
1010 | atomic_inc(&pkt->run_sm); | |
1011 | wake_up(&pd->wqueue); | |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* | |
1015 | * Schedule reads for the holes in a packet | |
1016 | */ | |
1017 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1018 | { | |
1019 | int frames_read = 0; | |
1020 | struct bio *bio; | |
1021 | int f; | |
1022 | char written[PACKET_MAX_SIZE]; | |
1023 | ||
c5ecc484 | 1024 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1da177e4 LT |
1025 | |
1026 | atomic_set(&pkt->io_wait, 0); | |
1027 | atomic_set(&pkt->io_errors, 0); | |
1028 | ||
1da177e4 LT |
1029 | /* |
1030 | * Figure out which frames we need to read before we can write. | |
1031 | */ | |
1032 | memset(written, 0, sizeof(written)); | |
1033 | spin_lock(&pkt->lock); | |
c5ecc484 | 1034 | bio_list_for_each(bio, &pkt->orig_bios) { |
4f024f37 KO |
1035 | int first_frame = (bio->bi_iter.bi_sector - pkt->sector) / |
1036 | (CD_FRAMESIZE >> 9); | |
1037 | int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1038 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1039 | BUG_ON(first_frame < 0); |
1040 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1041 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1042 | written[f] = 1; | |
1043 | } | |
1044 | spin_unlock(&pkt->lock); | |
1045 | ||
06e7ab53 | 1046 | if (pkt->cache_valid) { |
844aa797 | 1047 | pkt_dbg(2, pd, "zone %llx cached\n", |
06e7ab53 PO |
1048 | (unsigned long long)pkt->sector); |
1049 | goto out_account; | |
1050 | } | |
1051 | ||
1da177e4 LT |
1052 | /* |
1053 | * Schedule reads for missing parts of the packet. | |
1054 | */ | |
1055 | for (f = 0; f < pkt->frames; f++) { | |
1056 | int p, offset; | |
ccc5c9ca | 1057 | |
1da177e4 LT |
1058 | if (written[f]) |
1059 | continue; | |
ccc5c9ca | 1060 | |
1da177e4 | 1061 | bio = pkt->r_bios[f]; |
ccc5c9ca | 1062 | bio_reset(bio); |
4f024f37 | 1063 | bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1064 | bio->bi_bdev = pd->bdev; |
1065 | bio->bi_end_io = pkt_end_io_read; | |
1066 | bio->bi_private = pkt; | |
1067 | ||
1068 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1069 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
844aa797 | 1070 | pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n", |
1da177e4 LT |
1071 | f, pkt->pages[p], offset); |
1072 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1073 | BUG(); | |
1074 | ||
1075 | atomic_inc(&pkt->io_wait); | |
1076 | bio->bi_rw = READ; | |
46c271be | 1077 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1078 | frames_read++; |
1079 | } | |
1080 | ||
1081 | out_account: | |
844aa797 | 1082 | pkt_dbg(2, pd, "need %d frames for zone %llx\n", |
1da177e4 LT |
1083 | frames_read, (unsigned long long)pkt->sector); |
1084 | pd->stats.pkt_started++; | |
1085 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | /* | |
1089 | * Find a packet matching zone, or the least recently used packet if | |
1090 | * there is no match. | |
1091 | */ | |
1092 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1093 | { | |
1094 | struct packet_data *pkt; | |
1095 | ||
1096 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1097 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1098 | list_del_init(&pkt->list); | |
1099 | if (pkt->sector != zone) | |
1100 | pkt->cache_valid = 0; | |
610827de | 1101 | return pkt; |
1da177e4 LT |
1102 | } |
1103 | } | |
610827de PO |
1104 | BUG(); |
1105 | return NULL; | |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1109 | { | |
1110 | if (pkt->cache_valid) { | |
1111 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1112 | } else { | |
1113 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * recover a failed write, query for relocation if possible | |
1119 | * | |
1120 | * returns 1 if recovery is possible, or 0 if not | |
1121 | * | |
1122 | */ | |
1123 | static int pkt_start_recovery(struct packet_data *pkt) | |
1124 | { | |
1125 | /* | |
1126 | * FIXME. We need help from the file system to implement | |
1127 | * recovery handling. | |
1128 | */ | |
1129 | return 0; | |
1130 | #if 0 | |
1131 | struct request *rq = pkt->rq; | |
1132 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1133 | struct block_device *pkt_bdev; | |
1134 | struct super_block *sb = NULL; | |
1135 | unsigned long old_block, new_block; | |
1136 | sector_t new_sector; | |
1137 | ||
1138 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1139 | if (pkt_bdev) { | |
1140 | sb = get_super(pkt_bdev); | |
1141 | bdput(pkt_bdev); | |
1142 | } | |
1143 | ||
1144 | if (!sb) | |
1145 | return 0; | |
1146 | ||
e7f59097 | 1147 | if (!sb->s_op->relocate_blocks) |
1da177e4 LT |
1148 | goto out; |
1149 | ||
1150 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1151 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1152 | goto out; | |
1153 | ||
1154 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1155 | pkt->sector = new_sector; | |
1156 | ||
ff8e0070 KO |
1157 | bio_reset(pkt->bio); |
1158 | pkt->bio->bi_bdev = pd->bdev; | |
1159 | pkt->bio->bi_rw = REQ_WRITE; | |
4f024f37 KO |
1160 | pkt->bio->bi_iter.bi_sector = new_sector; |
1161 | pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE; | |
ff8e0070 | 1162 | pkt->bio->bi_vcnt = pkt->frames; |
1da177e4 | 1163 | |
ff8e0070 KO |
1164 | pkt->bio->bi_end_io = pkt_end_io_packet_write; |
1165 | pkt->bio->bi_private = pkt; | |
1da177e4 LT |
1166 | |
1167 | drop_super(sb); | |
1168 | return 1; | |
1169 | ||
1170 | out: | |
1171 | drop_super(sb); | |
1172 | return 0; | |
1173 | #endif | |
1174 | } | |
1175 | ||
1176 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1177 | { | |
1178 | #if PACKET_DEBUG > 1 | |
1179 | static const char *state_name[] = { | |
1180 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1181 | }; | |
1182 | enum packet_data_state old_state = pkt->state; | |
844aa797 | 1183 | pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n", |
cd3f2cd0 | 1184 | pkt->id, (unsigned long long)pkt->sector, |
1da177e4 LT |
1185 | state_name[old_state], state_name[state]); |
1186 | #endif | |
1187 | pkt->state = state; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Scan the work queue to see if we can start a new packet. | |
1192 | * returns non-zero if any work was done. | |
1193 | */ | |
1194 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1195 | { | |
1196 | struct packet_data *pkt, *p; | |
1197 | struct bio *bio = NULL; | |
1198 | sector_t zone = 0; /* Suppress gcc warning */ | |
1199 | struct pkt_rb_node *node, *first_node; | |
1200 | struct rb_node *n; | |
0a0fc960 | 1201 | int wakeup; |
1da177e4 | 1202 | |
1da177e4 LT |
1203 | atomic_set(&pd->scan_queue, 0); |
1204 | ||
1205 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
844aa797 | 1206 | pkt_dbg(2, pd, "no pkt\n"); |
1da177e4 LT |
1207 | return 0; |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Try to find a zone we are not already working on. | |
1212 | */ | |
1213 | spin_lock(&pd->lock); | |
1214 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1215 | if (!first_node) { | |
1216 | n = rb_first(&pd->bio_queue); | |
1217 | if (n) | |
1218 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1219 | } | |
1220 | node = first_node; | |
1221 | while (node) { | |
1222 | bio = node->bio; | |
4f024f37 | 1223 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 | 1224 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
7baeb6a5 PO |
1225 | if (p->sector == zone) { |
1226 | bio = NULL; | |
1da177e4 | 1227 | goto try_next_bio; |
7baeb6a5 | 1228 | } |
1da177e4 LT |
1229 | } |
1230 | break; | |
1231 | try_next_bio: | |
1232 | node = pkt_rbtree_next(node); | |
1233 | if (!node) { | |
1234 | n = rb_first(&pd->bio_queue); | |
1235 | if (n) | |
1236 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1237 | } | |
1238 | if (node == first_node) | |
1239 | node = NULL; | |
1240 | } | |
1241 | spin_unlock(&pd->lock); | |
1242 | if (!bio) { | |
844aa797 | 1243 | pkt_dbg(2, pd, "no bio\n"); |
1da177e4 LT |
1244 | return 0; |
1245 | } | |
1246 | ||
1247 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1248 | |
1249 | pd->current_sector = zone + pd->settings.size; | |
1250 | pkt->sector = zone; | |
e1bc89bc | 1251 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1252 | pkt->write_size = 0; |
1253 | ||
1254 | /* | |
1255 | * Scan work queue for bios in the same zone and link them | |
1256 | * to this packet. | |
1257 | */ | |
1258 | spin_lock(&pd->lock); | |
844aa797 | 1259 | pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone); |
1da177e4 LT |
1260 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
1261 | bio = node->bio; | |
4f024f37 KO |
1262 | pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long) |
1263 | get_zone(bio->bi_iter.bi_sector, pd)); | |
1264 | if (get_zone(bio->bi_iter.bi_sector, pd) != zone) | |
1da177e4 LT |
1265 | break; |
1266 | pkt_rbtree_erase(pd, node); | |
1267 | spin_lock(&pkt->lock); | |
c5ecc484 | 1268 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 | 1269 | pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE; |
1da177e4 LT |
1270 | spin_unlock(&pkt->lock); |
1271 | } | |
0a0fc960 TM |
1272 | /* check write congestion marks, and if bio_queue_size is |
1273 | below, wake up any waiters */ | |
1274 | wakeup = (pd->write_congestion_on > 0 | |
1275 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1276 | spin_unlock(&pd->lock); |
8aa7e847 JA |
1277 | if (wakeup) { |
1278 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, | |
1279 | BLK_RW_ASYNC); | |
1280 | } | |
1da177e4 LT |
1281 | |
1282 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1283 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1284 | atomic_set(&pkt->run_sm, 1); | |
1285 | ||
1286 | spin_lock(&pd->cdrw.active_list_lock); | |
1287 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1288 | spin_unlock(&pd->cdrw.active_list_lock); | |
1289 | ||
1290 | return 1; | |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * Assemble a bio to write one packet and queue the bio for processing | |
1295 | * by the underlying block device. | |
1296 | */ | |
1297 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1298 | { | |
1da177e4 | 1299 | int f; |
72772323 | 1300 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 | 1301 | |
ffb25dc6 | 1302 | bio_reset(pkt->w_bio); |
4f024f37 | 1303 | pkt->w_bio->bi_iter.bi_sector = pkt->sector; |
ffb25dc6 KO |
1304 | pkt->w_bio->bi_bdev = pd->bdev; |
1305 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1306 | pkt->w_bio->bi_private = pkt; | |
1307 | ||
1308 | /* XXX: locking? */ | |
1da177e4 | 1309 | for (f = 0; f < pkt->frames; f++) { |
72772323 PO |
1310 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1311 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
ffb25dc6 KO |
1312 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) |
1313 | BUG(); | |
1da177e4 | 1314 | } |
844aa797 | 1315 | pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1316 | |
1317 | /* | |
72772323 | 1318 | * Fill-in bvec with data from orig_bios. |
1da177e4 | 1319 | */ |
1da177e4 | 1320 | spin_lock(&pkt->lock); |
ffb25dc6 | 1321 | bio_copy_data(pkt->w_bio, pkt->orig_bios.head); |
1da177e4 | 1322 | |
1da177e4 LT |
1323 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
1324 | spin_unlock(&pkt->lock); | |
1325 | ||
844aa797 | 1326 | pkt_dbg(2, pd, "Writing %d frames for zone %llx\n", |
ffb25dc6 | 1327 | pkt->write_size, (unsigned long long)pkt->sector); |
1da177e4 LT |
1328 | |
1329 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1330 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1331 | pkt->cache_valid = 1; |
1332 | } else { | |
1333 | pkt->cache_valid = 0; | |
1334 | } | |
1335 | ||
1336 | /* Start the write request */ | |
1da177e4 LT |
1337 | atomic_set(&pkt->io_wait, 1); |
1338 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1339 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1340 | } |
1341 | ||
1342 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1343 | { | |
c5ecc484 | 1344 | struct bio *bio; |
1da177e4 LT |
1345 | |
1346 | if (!uptodate) | |
1347 | pkt->cache_valid = 0; | |
1348 | ||
1349 | /* Finish all bios corresponding to this packet */ | |
c5ecc484 | 1350 | while ((bio = bio_list_pop(&pkt->orig_bios))) |
6712ecf8 | 1351 | bio_endio(bio, uptodate ? 0 : -EIO); |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1355 | { | |
1356 | int uptodate; | |
1357 | ||
844aa797 | 1358 | pkt_dbg(2, pd, "pkt %d\n", pkt->id); |
1da177e4 LT |
1359 | |
1360 | for (;;) { | |
1361 | switch (pkt->state) { | |
1362 | case PACKET_WAITING_STATE: | |
1363 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1364 | return; | |
1365 | ||
1366 | pkt->sleep_time = 0; | |
1367 | pkt_gather_data(pd, pkt); | |
1368 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1369 | break; | |
1370 | ||
1371 | case PACKET_READ_WAIT_STATE: | |
1372 | if (atomic_read(&pkt->io_wait) > 0) | |
1373 | return; | |
1374 | ||
1375 | if (atomic_read(&pkt->io_errors) > 0) { | |
1376 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1377 | } else { | |
1378 | pkt_start_write(pd, pkt); | |
1379 | } | |
1380 | break; | |
1381 | ||
1382 | case PACKET_WRITE_WAIT_STATE: | |
1383 | if (atomic_read(&pkt->io_wait) > 0) | |
1384 | return; | |
1385 | ||
1386 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1387 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1388 | } else { | |
1389 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1390 | } | |
1391 | break; | |
1392 | ||
1393 | case PACKET_RECOVERY_STATE: | |
1394 | if (pkt_start_recovery(pkt)) { | |
1395 | pkt_start_write(pd, pkt); | |
1396 | } else { | |
844aa797 | 1397 | pkt_dbg(2, pd, "No recovery possible\n"); |
1da177e4 LT |
1398 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1399 | } | |
1400 | break; | |
1401 | ||
1402 | case PACKET_FINISHED_STATE: | |
1403 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1404 | pkt_finish_packet(pkt, uptodate); | |
1405 | return; | |
1406 | ||
1407 | default: | |
1408 | BUG(); | |
1409 | break; | |
1410 | } | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1415 | { | |
1416 | struct packet_data *pkt, *next; | |
1417 | ||
1da177e4 LT |
1418 | /* |
1419 | * Run state machine for active packets | |
1420 | */ | |
1421 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1422 | if (atomic_read(&pkt->run_sm) > 0) { | |
1423 | atomic_set(&pkt->run_sm, 0); | |
1424 | pkt_run_state_machine(pd, pkt); | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * Move no longer active packets to the free list | |
1430 | */ | |
1431 | spin_lock(&pd->cdrw.active_list_lock); | |
1432 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1433 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1434 | list_del(&pkt->list); | |
1435 | pkt_put_packet_data(pd, pkt); | |
1436 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1437 | atomic_set(&pd->scan_queue, 1); | |
1438 | } | |
1439 | } | |
1440 | spin_unlock(&pd->cdrw.active_list_lock); | |
1441 | } | |
1442 | ||
1443 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1444 | { | |
1445 | struct packet_data *pkt; | |
1446 | int i; | |
1447 | ||
ae7642bb | 1448 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1449 | states[i] = 0; |
1450 | ||
1451 | spin_lock(&pd->cdrw.active_list_lock); | |
1452 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1453 | states[pkt->state]++; | |
1454 | } | |
1455 | spin_unlock(&pd->cdrw.active_list_lock); | |
1456 | } | |
1457 | ||
1458 | /* | |
1459 | * kcdrwd is woken up when writes have been queued for one of our | |
1460 | * registered devices | |
1461 | */ | |
1462 | static int kcdrwd(void *foobar) | |
1463 | { | |
1464 | struct pktcdvd_device *pd = foobar; | |
1465 | struct packet_data *pkt; | |
1466 | long min_sleep_time, residue; | |
1467 | ||
8698a745 | 1468 | set_user_nice(current, MIN_NICE); |
83144186 | 1469 | set_freezable(); |
1da177e4 LT |
1470 | |
1471 | for (;;) { | |
1472 | DECLARE_WAITQUEUE(wait, current); | |
1473 | ||
1474 | /* | |
1475 | * Wait until there is something to do | |
1476 | */ | |
1477 | add_wait_queue(&pd->wqueue, &wait); | |
1478 | for (;;) { | |
1479 | set_current_state(TASK_INTERRUPTIBLE); | |
1480 | ||
1481 | /* Check if we need to run pkt_handle_queue */ | |
1482 | if (atomic_read(&pd->scan_queue) > 0) | |
1483 | goto work_to_do; | |
1484 | ||
1485 | /* Check if we need to run the state machine for some packet */ | |
1486 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1487 | if (atomic_read(&pkt->run_sm) > 0) | |
1488 | goto work_to_do; | |
1489 | } | |
1490 | ||
1491 | /* Check if we need to process the iosched queues */ | |
1492 | if (atomic_read(&pd->iosched.attention) != 0) | |
1493 | goto work_to_do; | |
1494 | ||
1495 | /* Otherwise, go to sleep */ | |
1496 | if (PACKET_DEBUG > 1) { | |
1497 | int states[PACKET_NUM_STATES]; | |
1498 | pkt_count_states(pd, states); | |
844aa797 | 1499 | pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
cd3f2cd0 JP |
1500 | states[0], states[1], states[2], |
1501 | states[3], states[4], states[5]); | |
1da177e4 LT |
1502 | } |
1503 | ||
1504 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1505 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1506 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1507 | min_sleep_time = pkt->sleep_time; | |
1508 | } | |
1509 | ||
844aa797 | 1510 | pkt_dbg(2, pd, "sleeping\n"); |
1da177e4 | 1511 | residue = schedule_timeout(min_sleep_time); |
844aa797 | 1512 | pkt_dbg(2, pd, "wake up\n"); |
1da177e4 LT |
1513 | |
1514 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1515 | try_to_freeze(); |
1da177e4 LT |
1516 | |
1517 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1518 | if (!pkt->sleep_time) | |
1519 | continue; | |
1520 | pkt->sleep_time -= min_sleep_time - residue; | |
1521 | if (pkt->sleep_time <= 0) { | |
1522 | pkt->sleep_time = 0; | |
1523 | atomic_inc(&pkt->run_sm); | |
1524 | } | |
1525 | } | |
1526 | ||
1da177e4 LT |
1527 | if (kthread_should_stop()) |
1528 | break; | |
1529 | } | |
1530 | work_to_do: | |
1531 | set_current_state(TASK_RUNNING); | |
1532 | remove_wait_queue(&pd->wqueue, &wait); | |
1533 | ||
1534 | if (kthread_should_stop()) | |
1535 | break; | |
1536 | ||
1537 | /* | |
1538 | * if pkt_handle_queue returns true, we can queue | |
1539 | * another request. | |
1540 | */ | |
1541 | while (pkt_handle_queue(pd)) | |
1542 | ; | |
1543 | ||
1544 | /* | |
1545 | * Handle packet state machine | |
1546 | */ | |
1547 | pkt_handle_packets(pd); | |
1548 | ||
1549 | /* | |
1550 | * Handle iosched queues | |
1551 | */ | |
1552 | pkt_iosched_process_queue(pd); | |
1553 | } | |
1554 | ||
1555 | return 0; | |
1556 | } | |
1557 | ||
1558 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1559 | { | |
0c075d64 JP |
1560 | pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n", |
1561 | pd->settings.fp ? "Fixed" : "Variable", | |
1562 | pd->settings.size >> 2, | |
1563 | pd->settings.block_mode == 8 ? '1' : '2'); | |
1da177e4 LT |
1564 | } |
1565 | ||
1566 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1567 | { | |
1568 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1569 | ||
1570 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1571 | cgc->cmd[2] = page_code | (page_control << 6); | |
1572 | cgc->cmd[7] = cgc->buflen >> 8; | |
1573 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1574 | cgc->data_direction = CGC_DATA_READ; | |
1575 | return pkt_generic_packet(pd, cgc); | |
1576 | } | |
1577 | ||
1578 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1579 | { | |
1580 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1581 | memset(cgc->buffer, 0, 2); | |
1582 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1583 | cgc->cmd[1] = 0x10; /* PF */ | |
1584 | cgc->cmd[7] = cgc->buflen >> 8; | |
1585 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1586 | cgc->data_direction = CGC_DATA_WRITE; | |
1587 | return pkt_generic_packet(pd, cgc); | |
1588 | } | |
1589 | ||
1590 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1591 | { | |
1592 | struct packet_command cgc; | |
1593 | int ret; | |
1594 | ||
1595 | /* set up command and get the disc info */ | |
1596 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1597 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1598 | cgc.cmd[8] = cgc.buflen = 2; | |
1599 | cgc.quiet = 1; | |
1600 | ||
1601 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1602 | return ret; | |
1603 | ||
1604 | /* not all drives have the same disc_info length, so requeue | |
1605 | * packet with the length the drive tells us it can supply | |
1606 | */ | |
1607 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1608 | sizeof(di->disc_information_length); | |
1609 | ||
1610 | if (cgc.buflen > sizeof(disc_information)) | |
1611 | cgc.buflen = sizeof(disc_information); | |
1612 | ||
1613 | cgc.cmd[8] = cgc.buflen; | |
1614 | return pkt_generic_packet(pd, &cgc); | |
1615 | } | |
1616 | ||
1617 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1618 | { | |
1619 | struct packet_command cgc; | |
1620 | int ret; | |
1621 | ||
1622 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1623 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1624 | cgc.cmd[1] = type & 3; | |
1625 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1626 | cgc.cmd[5] = track & 0xff; | |
1627 | cgc.cmd[8] = 8; | |
1628 | cgc.quiet = 1; | |
1629 | ||
1630 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1631 | return ret; | |
1632 | ||
1633 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1634 | sizeof(ti->track_information_length); | |
1635 | ||
1636 | if (cgc.buflen > sizeof(track_information)) | |
1637 | cgc.buflen = sizeof(track_information); | |
1638 | ||
1639 | cgc.cmd[8] = cgc.buflen; | |
1640 | return pkt_generic_packet(pd, &cgc); | |
1641 | } | |
1642 | ||
05680d86 PO |
1643 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1644 | long *last_written) | |
1da177e4 LT |
1645 | { |
1646 | disc_information di; | |
1647 | track_information ti; | |
1648 | __u32 last_track; | |
1649 | int ret = -1; | |
1650 | ||
1651 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1652 | return ret; | |
1653 | ||
1654 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1655 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1656 | return ret; | |
1657 | ||
1658 | /* if this track is blank, try the previous. */ | |
1659 | if (ti.blank) { | |
1660 | last_track--; | |
1661 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1662 | return ret; | |
1663 | } | |
1664 | ||
1665 | /* if last recorded field is valid, return it. */ | |
1666 | if (ti.lra_v) { | |
1667 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1668 | } else { | |
1669 | /* make it up instead */ | |
1670 | *last_written = be32_to_cpu(ti.track_start) + | |
1671 | be32_to_cpu(ti.track_size); | |
1672 | if (ti.free_blocks) | |
1673 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1674 | } | |
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * write mode select package based on pd->settings | |
1680 | */ | |
05680d86 | 1681 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1682 | { |
1683 | struct packet_command cgc; | |
1684 | struct request_sense sense; | |
1685 | write_param_page *wp; | |
1686 | char buffer[128]; | |
1687 | int ret, size; | |
1688 | ||
1689 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1690 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1691 | return 0; | |
1692 | ||
1693 | memset(buffer, 0, sizeof(buffer)); | |
1694 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1695 | cgc.sense = &sense; | |
1696 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
f3ded788 | 1697 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1698 | return ret; |
1699 | } | |
1700 | ||
1701 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1702 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1703 | if (size > sizeof(buffer)) | |
1704 | size = sizeof(buffer); | |
1705 | ||
1706 | /* | |
1707 | * now get it all | |
1708 | */ | |
1709 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1710 | cgc.sense = &sense; | |
1711 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
f3ded788 | 1712 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1713 | return ret; |
1714 | } | |
1715 | ||
1716 | /* | |
1717 | * write page is offset header + block descriptor length | |
1718 | */ | |
1719 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1720 | ||
1721 | wp->fp = pd->settings.fp; | |
1722 | wp->track_mode = pd->settings.track_mode; | |
1723 | wp->write_type = pd->settings.write_type; | |
1724 | wp->data_block_type = pd->settings.block_mode; | |
1725 | ||
1726 | wp->multi_session = 0; | |
1727 | ||
1728 | #ifdef PACKET_USE_LS | |
1729 | wp->link_size = 7; | |
1730 | wp->ls_v = 1; | |
1731 | #endif | |
1732 | ||
1733 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1734 | wp->session_format = 0; | |
1735 | wp->subhdr2 = 0x20; | |
1736 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1737 | wp->session_format = 0x20; | |
1738 | wp->subhdr2 = 8; | |
1739 | #if 0 | |
1740 | wp->mcn[0] = 0x80; | |
1741 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1742 | #endif | |
1743 | } else { | |
1744 | /* | |
1745 | * paranoia | |
1746 | */ | |
fa63c0ab | 1747 | pkt_err(pd, "write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1748 | return 1; |
1749 | } | |
1750 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1751 | ||
1752 | cgc.buflen = cgc.cmd[8] = size; | |
1753 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
f3ded788 | 1754 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1755 | return ret; |
1756 | } | |
1757 | ||
1758 | pkt_print_settings(pd); | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | /* | |
7c613d59 | 1763 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1764 | */ |
ab863ec3 | 1765 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1766 | { |
ab863ec3 PO |
1767 | switch (pd->mmc3_profile) { |
1768 | case 0x1a: /* DVD+RW */ | |
1769 | case 0x12: /* DVD-RAM */ | |
1770 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1771 | return 1; | |
1772 | default: | |
1773 | break; | |
1774 | } | |
1da177e4 | 1775 | |
ab863ec3 PO |
1776 | if (!ti->packet || !ti->fp) |
1777 | return 0; | |
1da177e4 LT |
1778 | |
1779 | /* | |
1780 | * "good" settings as per Mt Fuji. | |
1781 | */ | |
ab863ec3 | 1782 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1783 | return 1; |
1da177e4 | 1784 | |
ab863ec3 | 1785 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1786 | return 1; |
1da177e4 | 1787 | |
ab863ec3 | 1788 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1789 | return 1; |
1da177e4 | 1790 | |
fa63c0ab | 1791 | pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1792 | return 0; |
1da177e4 LT |
1793 | } |
1794 | ||
1795 | /* | |
7c613d59 | 1796 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1797 | */ |
7c613d59 | 1798 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1799 | { |
1800 | switch (pd->mmc3_profile) { | |
1801 | case 0x0a: /* CD-RW */ | |
1802 | case 0xffff: /* MMC3 not supported */ | |
1803 | break; | |
1804 | case 0x1a: /* DVD+RW */ | |
1805 | case 0x13: /* DVD-RW */ | |
1806 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1807 | return 1; |
1da177e4 | 1808 | default: |
844aa797 | 1809 | pkt_dbg(2, pd, "Wrong disc profile (%x)\n", |
cd3f2cd0 | 1810 | pd->mmc3_profile); |
7c613d59 | 1811 | return 0; |
1da177e4 LT |
1812 | } |
1813 | ||
1814 | /* | |
1815 | * for disc type 0xff we should probably reserve a new track. | |
1816 | * but i'm not sure, should we leave this to user apps? probably. | |
1817 | */ | |
1818 | if (di->disc_type == 0xff) { | |
ca73dabc | 1819 | pkt_notice(pd, "unknown disc - no track?\n"); |
7c613d59 | 1820 | return 0; |
1da177e4 LT |
1821 | } |
1822 | ||
1823 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
fa63c0ab | 1824 | pkt_err(pd, "wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1825 | return 0; |
1da177e4 LT |
1826 | } |
1827 | ||
1828 | if (di->erasable == 0) { | |
ca73dabc | 1829 | pkt_notice(pd, "disc not erasable\n"); |
7c613d59 | 1830 | return 0; |
1da177e4 LT |
1831 | } |
1832 | ||
1833 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
fa63c0ab | 1834 | pkt_err(pd, "can't write to last track (reserved)\n"); |
7c613d59 | 1835 | return 0; |
1da177e4 LT |
1836 | } |
1837 | ||
7c613d59 | 1838 | return 1; |
1da177e4 LT |
1839 | } |
1840 | ||
05680d86 | 1841 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1842 | { |
1843 | struct packet_command cgc; | |
1844 | unsigned char buf[12]; | |
1845 | disc_information di; | |
1846 | track_information ti; | |
1847 | int ret, track; | |
1848 | ||
1849 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1850 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1851 | cgc.cmd[8] = 8; | |
1852 | ret = pkt_generic_packet(pd, &cgc); | |
1853 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1854 | ||
1855 | memset(&di, 0, sizeof(disc_information)); | |
1856 | memset(&ti, 0, sizeof(track_information)); | |
1857 | ||
1858 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
fa63c0ab | 1859 | pkt_err(pd, "failed get_disc\n"); |
1da177e4 LT |
1860 | return ret; |
1861 | } | |
1862 | ||
7c613d59 | 1863 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1864 | return -EROFS; |
1da177e4 | 1865 | |
1da177e4 LT |
1866 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1867 | ||
1868 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1869 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
fa63c0ab | 1870 | pkt_err(pd, "failed get_track\n"); |
1da177e4 LT |
1871 | return ret; |
1872 | } | |
1873 | ||
ab863ec3 | 1874 | if (!pkt_writable_track(pd, &ti)) { |
fa63c0ab | 1875 | pkt_err(pd, "can't write to this track\n"); |
9db91546 | 1876 | return -EROFS; |
1da177e4 LT |
1877 | } |
1878 | ||
1879 | /* | |
1880 | * we keep packet size in 512 byte units, makes it easier to | |
1881 | * deal with request calculations. | |
1882 | */ | |
1883 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1884 | if (pd->settings.size == 0) { | |
ca73dabc | 1885 | pkt_notice(pd, "detected zero packet size!\n"); |
a460ad62 | 1886 | return -ENXIO; |
1da177e4 | 1887 | } |
d0272e78 | 1888 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
fa63c0ab | 1889 | pkt_err(pd, "packet size is too big\n"); |
9db91546 | 1890 | return -EROFS; |
d0272e78 | 1891 | } |
1da177e4 LT |
1892 | pd->settings.fp = ti.fp; |
1893 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1894 | ||
1895 | if (ti.nwa_v) { | |
1896 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1897 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * in theory we could use lra on -RW media as well and just zero | |
1902 | * blocks that haven't been written yet, but in practice that | |
1903 | * is just a no-go. we'll use that for -R, naturally. | |
1904 | */ | |
1905 | if (ti.lra_v) { | |
1906 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1907 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1908 | } else { | |
1909 | pd->lra = 0xffffffff; | |
1910 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1911 | } | |
1912 | ||
1913 | /* | |
1914 | * fine for now | |
1915 | */ | |
1916 | pd->settings.link_loss = 7; | |
1917 | pd->settings.write_type = 0; /* packet */ | |
1918 | pd->settings.track_mode = ti.track_mode; | |
1919 | ||
1920 | /* | |
1921 | * mode1 or mode2 disc | |
1922 | */ | |
1923 | switch (ti.data_mode) { | |
1924 | case PACKET_MODE1: | |
1925 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1926 | break; | |
1927 | case PACKET_MODE2: | |
1928 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1929 | break; | |
1930 | default: | |
fa63c0ab | 1931 | pkt_err(pd, "unknown data mode\n"); |
9db91546 | 1932 | return -EROFS; |
1da177e4 LT |
1933 | } |
1934 | return 0; | |
1935 | } | |
1936 | ||
1937 | /* | |
1938 | * enable/disable write caching on drive | |
1939 | */ | |
05680d86 PO |
1940 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
1941 | int set) | |
1da177e4 LT |
1942 | { |
1943 | struct packet_command cgc; | |
1944 | struct request_sense sense; | |
1945 | unsigned char buf[64]; | |
1946 | int ret; | |
1947 | ||
1da177e4 LT |
1948 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
1949 | cgc.sense = &sense; | |
1950 | cgc.buflen = pd->mode_offset + 12; | |
1951 | ||
1952 | /* | |
1953 | * caching mode page might not be there, so quiet this command | |
1954 | */ | |
1955 | cgc.quiet = 1; | |
1956 | ||
1957 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
1958 | return ret; | |
1959 | ||
1960 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1961 | ||
1962 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1963 | ret = pkt_mode_select(pd, &cgc); | |
1964 | if (ret) { | |
fa63c0ab | 1965 | pkt_err(pd, "write caching control failed\n"); |
f3ded788 | 1966 | pkt_dump_sense(pd, &cgc); |
1da177e4 | 1967 | } else if (!ret && set) |
ca73dabc | 1968 | pkt_notice(pd, "enabled write caching\n"); |
1da177e4 LT |
1969 | return ret; |
1970 | } | |
1971 | ||
1972 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1973 | { | |
1974 | struct packet_command cgc; | |
1975 | ||
1976 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1977 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1978 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1979 | return pkt_generic_packet(pd, &cgc); | |
1980 | } | |
1981 | ||
1982 | /* | |
1983 | * Returns drive maximum write speed | |
1984 | */ | |
05680d86 PO |
1985 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
1986 | unsigned *write_speed) | |
1da177e4 LT |
1987 | { |
1988 | struct packet_command cgc; | |
1989 | struct request_sense sense; | |
1990 | unsigned char buf[256+18]; | |
1991 | unsigned char *cap_buf; | |
1992 | int ret, offset; | |
1993 | ||
1da177e4 LT |
1994 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
1995 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
1996 | cgc.sense = &sense; | |
1997 | ||
1998 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1999 | if (ret) { | |
2000 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
2001 | sizeof(struct mode_page_header); | |
2002 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2003 | if (ret) { | |
f3ded788 | 2004 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2005 | return ret; |
2006 | } | |
2007 | } | |
2008 | ||
2009 | offset = 20; /* Obsoleted field, used by older drives */ | |
2010 | if (cap_buf[1] >= 28) | |
2011 | offset = 28; /* Current write speed selected */ | |
2012 | if (cap_buf[1] >= 30) { | |
2013 | /* If the drive reports at least one "Logical Unit Write | |
2014 | * Speed Performance Descriptor Block", use the information | |
2015 | * in the first block. (contains the highest speed) | |
2016 | */ | |
2017 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2018 | if (num_spdb > 0) | |
2019 | offset = 34; | |
2020 | } | |
2021 | ||
2022 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | /* These tables from cdrecord - I don't have orange book */ | |
2027 | /* standard speed CD-RW (1-4x) */ | |
2028 | static char clv_to_speed[16] = { | |
2029 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2030 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2031 | }; | |
2032 | /* high speed CD-RW (-10x) */ | |
2033 | static char hs_clv_to_speed[16] = { | |
2034 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2035 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2036 | }; | |
2037 | /* ultra high speed CD-RW */ | |
2038 | static char us_clv_to_speed[16] = { | |
2039 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2040 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2041 | }; | |
2042 | ||
2043 | /* | |
2044 | * reads the maximum media speed from ATIP | |
2045 | */ | |
05680d86 PO |
2046 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2047 | unsigned *speed) | |
1da177e4 LT |
2048 | { |
2049 | struct packet_command cgc; | |
2050 | struct request_sense sense; | |
2051 | unsigned char buf[64]; | |
2052 | unsigned int size, st, sp; | |
2053 | int ret; | |
2054 | ||
2055 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2056 | cgc.sense = &sense; | |
2057 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2058 | cgc.cmd[1] = 2; | |
2059 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2060 | cgc.cmd[8] = 2; | |
2061 | ret = pkt_generic_packet(pd, &cgc); | |
2062 | if (ret) { | |
f3ded788 | 2063 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2064 | return ret; |
2065 | } | |
2066 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2067 | if (size > sizeof(buf)) | |
2068 | size = sizeof(buf); | |
2069 | ||
2070 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2071 | cgc.sense = &sense; | |
2072 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2073 | cgc.cmd[1] = 2; | |
2074 | cgc.cmd[2] = 4; | |
2075 | cgc.cmd[8] = size; | |
2076 | ret = pkt_generic_packet(pd, &cgc); | |
2077 | if (ret) { | |
f3ded788 | 2078 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2079 | return ret; |
2080 | } | |
2081 | ||
eaa0ff15 | 2082 | if (!(buf[6] & 0x40)) { |
ca73dabc | 2083 | pkt_notice(pd, "disc type is not CD-RW\n"); |
1da177e4 LT |
2084 | return 1; |
2085 | } | |
eaa0ff15 | 2086 | if (!(buf[6] & 0x4)) { |
ca73dabc | 2087 | pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2088 | return 1; |
2089 | } | |
2090 | ||
2091 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2092 | ||
2093 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2094 | ||
2095 | /* Info from cdrecord */ | |
2096 | switch (st) { | |
2097 | case 0: /* standard speed */ | |
2098 | *speed = clv_to_speed[sp]; | |
2099 | break; | |
2100 | case 1: /* high speed */ | |
2101 | *speed = hs_clv_to_speed[sp]; | |
2102 | break; | |
2103 | case 2: /* ultra high speed */ | |
2104 | *speed = us_clv_to_speed[sp]; | |
2105 | break; | |
2106 | default: | |
ca73dabc | 2107 | pkt_notice(pd, "unknown disc sub-type %d\n", st); |
1da177e4 LT |
2108 | return 1; |
2109 | } | |
2110 | if (*speed) { | |
0c075d64 | 2111 | pkt_info(pd, "maximum media speed: %d\n", *speed); |
1da177e4 LT |
2112 | return 0; |
2113 | } else { | |
ca73dabc | 2114 | pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st); |
1da177e4 LT |
2115 | return 1; |
2116 | } | |
2117 | } | |
2118 | ||
05680d86 | 2119 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2120 | { |
2121 | struct packet_command cgc; | |
2122 | struct request_sense sense; | |
2123 | int ret; | |
2124 | ||
844aa797 | 2125 | pkt_dbg(2, pd, "Performing OPC\n"); |
1da177e4 LT |
2126 | |
2127 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2128 | cgc.sense = &sense; | |
2129 | cgc.timeout = 60*HZ; | |
2130 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2131 | cgc.cmd[1] = 1; | |
2132 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
f3ded788 | 2133 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2134 | return ret; |
2135 | } | |
2136 | ||
2137 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2138 | { | |
2139 | int ret; | |
2140 | unsigned int write_speed, media_write_speed, read_speed; | |
2141 | ||
2142 | if ((ret = pkt_probe_settings(pd))) { | |
844aa797 | 2143 | pkt_dbg(2, pd, "failed probe\n"); |
9db91546 | 2144 | return ret; |
1da177e4 LT |
2145 | } |
2146 | ||
2147 | if ((ret = pkt_set_write_settings(pd))) { | |
844aa797 | 2148 | pkt_dbg(1, pd, "failed saving write settings\n"); |
1da177e4 LT |
2149 | return -EIO; |
2150 | } | |
2151 | ||
2152 | pkt_write_caching(pd, USE_WCACHING); | |
2153 | ||
2154 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2155 | write_speed = 16 * 177; | |
2156 | switch (pd->mmc3_profile) { | |
2157 | case 0x13: /* DVD-RW */ | |
2158 | case 0x1a: /* DVD+RW */ | |
2159 | case 0x12: /* DVD-RAM */ | |
844aa797 | 2160 | pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2161 | break; |
2162 | default: | |
2163 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2164 | media_write_speed = 16; | |
2165 | write_speed = min(write_speed, media_write_speed * 177); | |
844aa797 | 2166 | pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2167 | break; |
2168 | } | |
2169 | read_speed = write_speed; | |
2170 | ||
2171 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
844aa797 | 2172 | pkt_dbg(1, pd, "couldn't set write speed\n"); |
1da177e4 LT |
2173 | return -EIO; |
2174 | } | |
2175 | pd->write_speed = write_speed; | |
2176 | pd->read_speed = read_speed; | |
2177 | ||
2178 | if ((ret = pkt_perform_opc(pd))) { | |
844aa797 | 2179 | pkt_dbg(1, pd, "Optimum Power Calibration failed\n"); |
1da177e4 LT |
2180 | } |
2181 | ||
2182 | return 0; | |
2183 | } | |
2184 | ||
2185 | /* | |
2186 | * called at open time. | |
2187 | */ | |
aeb5d727 | 2188 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
1da177e4 LT |
2189 | { |
2190 | int ret; | |
2191 | long lba; | |
165125e1 | 2192 | struct request_queue *q; |
1da177e4 LT |
2193 | |
2194 | /* | |
2195 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2196 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2197 | * so bdget() can't fail. | |
2198 | */ | |
2199 | bdget(pd->bdev->bd_dev); | |
e525fd89 | 2200 | if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd))) |
1da177e4 LT |
2201 | goto out; |
2202 | ||
2203 | if ((ret = pkt_get_last_written(pd, &lba))) { | |
fa63c0ab | 2204 | pkt_err(pd, "pkt_get_last_written failed\n"); |
e525fd89 | 2205 | goto out_putdev; |
1da177e4 LT |
2206 | } |
2207 | ||
2208 | set_capacity(pd->disk, lba << 2); | |
2209 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2210 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2211 | ||
2212 | q = bdev_get_queue(pd->bdev); | |
2213 | if (write) { | |
2214 | if ((ret = pkt_open_write(pd))) | |
e525fd89 | 2215 | goto out_putdev; |
1da177e4 LT |
2216 | /* |
2217 | * Some CDRW drives can not handle writes larger than one packet, | |
2218 | * even if the size is a multiple of the packet size. | |
2219 | */ | |
2220 | spin_lock_irq(q->queue_lock); | |
086fa5ff | 2221 | blk_queue_max_hw_sectors(q, pd->settings.size); |
1da177e4 LT |
2222 | spin_unlock_irq(q->queue_lock); |
2223 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2224 | } else { | |
2225 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2226 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2227 | } | |
2228 | ||
2229 | if ((ret = pkt_set_segment_merging(pd, q))) | |
e525fd89 | 2230 | goto out_putdev; |
1da177e4 | 2231 | |
e1bc89bc PO |
2232 | if (write) { |
2233 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
fa63c0ab | 2234 | pkt_err(pd, "not enough memory for buffers\n"); |
e1bc89bc | 2235 | ret = -ENOMEM; |
e525fd89 | 2236 | goto out_putdev; |
e1bc89bc | 2237 | } |
0c075d64 | 2238 | pkt_info(pd, "%lukB available on disc\n", lba << 1); |
e1bc89bc | 2239 | } |
1da177e4 LT |
2240 | |
2241 | return 0; | |
2242 | ||
2243 | out_putdev: | |
e525fd89 | 2244 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
1da177e4 LT |
2245 | out: |
2246 | return ret; | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | * called when the device is closed. makes sure that the device flushes | |
2251 | * the internal cache before we close. | |
2252 | */ | |
2253 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2254 | { | |
2255 | if (flush && pkt_flush_cache(pd)) | |
844aa797 | 2256 | pkt_dbg(1, pd, "not flushing cache\n"); |
1da177e4 LT |
2257 | |
2258 | pkt_lock_door(pd, 0); | |
2259 | ||
2260 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
e525fd89 | 2261 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
e1bc89bc PO |
2262 | |
2263 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2264 | } |
2265 | ||
252a52aa | 2266 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) |
1da177e4 LT |
2267 | { |
2268 | if (dev_minor >= MAX_WRITERS) | |
2269 | return NULL; | |
2270 | return pkt_devs[dev_minor]; | |
2271 | } | |
2272 | ||
5e5e007c | 2273 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
2274 | { |
2275 | struct pktcdvd_device *pd = NULL; | |
2276 | int ret; | |
2277 | ||
2a48fc0a | 2278 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2279 | mutex_lock(&ctl_mutex); |
5e5e007c | 2280 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
1da177e4 LT |
2281 | if (!pd) { |
2282 | ret = -ENODEV; | |
2283 | goto out; | |
2284 | } | |
2285 | BUG_ON(pd->refcnt < 0); | |
2286 | ||
2287 | pd->refcnt++; | |
46f4e1b7 | 2288 | if (pd->refcnt > 1) { |
5e5e007c | 2289 | if ((mode & FMODE_WRITE) && |
46f4e1b7 PO |
2290 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2291 | ret = -EBUSY; | |
2292 | goto out_dec; | |
2293 | } | |
2294 | } else { | |
5e5e007c | 2295 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
01fd9fda | 2296 | if (ret) |
1da177e4 | 2297 | goto out_dec; |
1da177e4 LT |
2298 | /* |
2299 | * needed here as well, since ext2 (among others) may change | |
2300 | * the blocksize at mount time | |
2301 | */ | |
5e5e007c | 2302 | set_blocksize(bdev, CD_FRAMESIZE); |
1da177e4 LT |
2303 | } |
2304 | ||
1657f824 | 2305 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2306 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2307 | return 0; |
2308 | ||
2309 | out_dec: | |
2310 | pd->refcnt--; | |
2311 | out: | |
1657f824 | 2312 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2313 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2314 | return ret; |
2315 | } | |
2316 | ||
db2a144b | 2317 | static void pkt_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2318 | { |
5e5e007c | 2319 | struct pktcdvd_device *pd = disk->private_data; |
1da177e4 | 2320 | |
2a48fc0a | 2321 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2322 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2323 | pd->refcnt--; |
2324 | BUG_ON(pd->refcnt < 0); | |
2325 | if (pd->refcnt == 0) { | |
2326 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2327 | pkt_release_dev(pd, flush); | |
2328 | } | |
1657f824 | 2329 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2330 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2331 | } |
2332 | ||
2333 | ||
6712ecf8 | 2334 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
1da177e4 LT |
2335 | { |
2336 | struct packet_stacked_data *psd = bio->bi_private; | |
2337 | struct pktcdvd_device *pd = psd->pd; | |
2338 | ||
1da177e4 | 2339 | bio_put(bio); |
6712ecf8 | 2340 | bio_endio(psd->bio, err); |
1da177e4 LT |
2341 | mempool_free(psd, psd_pool); |
2342 | pkt_bio_finished(pd); | |
1da177e4 LT |
2343 | } |
2344 | ||
20d0189b | 2345 | static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 | 2346 | { |
20d0189b KO |
2347 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); |
2348 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2349 | ||
2350 | psd->pd = pd; | |
2351 | psd->bio = bio; | |
2352 | cloned_bio->bi_bdev = pd->bdev; | |
2353 | cloned_bio->bi_private = psd; | |
2354 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2355 | pd->stats.secs_r += bio_sectors(bio); | |
2356 | pkt_queue_bio(pd, cloned_bio); | |
2357 | } | |
2358 | ||
2359 | static void pkt_make_request_write(struct request_queue *q, struct bio *bio) | |
2360 | { | |
2361 | struct pktcdvd_device *pd = q->queuedata; | |
1da177e4 LT |
2362 | sector_t zone; |
2363 | struct packet_data *pkt; | |
2364 | int was_empty, blocked_bio; | |
2365 | struct pkt_rb_node *node; | |
2366 | ||
4f024f37 | 2367 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 LT |
2368 | |
2369 | /* | |
2370 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2371 | * just append this bio to that packet. | |
2372 | */ | |
2373 | spin_lock(&pd->cdrw.active_list_lock); | |
2374 | blocked_bio = 0; | |
2375 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2376 | if (pkt->sector == zone) { | |
2377 | spin_lock(&pkt->lock); | |
2378 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2379 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
c5ecc484 | 2380 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 KO |
2381 | pkt->write_size += |
2382 | bio->bi_iter.bi_size / CD_FRAMESIZE; | |
1da177e4 LT |
2383 | if ((pkt->write_size >= pkt->frames) && |
2384 | (pkt->state == PACKET_WAITING_STATE)) { | |
2385 | atomic_inc(&pkt->run_sm); | |
2386 | wake_up(&pd->wqueue); | |
2387 | } | |
2388 | spin_unlock(&pkt->lock); | |
2389 | spin_unlock(&pd->cdrw.active_list_lock); | |
5a7bbad2 | 2390 | return; |
1da177e4 LT |
2391 | } else { |
2392 | blocked_bio = 1; | |
2393 | } | |
2394 | spin_unlock(&pkt->lock); | |
2395 | } | |
2396 | } | |
2397 | spin_unlock(&pd->cdrw.active_list_lock); | |
2398 | ||
0a0fc960 TM |
2399 | /* |
2400 | * Test if there is enough room left in the bio work queue | |
2401 | * (queue size >= congestion on mark). | |
2402 | * If not, wait till the work queue size is below the congestion off mark. | |
2403 | */ | |
2404 | spin_lock(&pd->lock); | |
2405 | if (pd->write_congestion_on > 0 | |
2406 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
8aa7e847 | 2407 | set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC); |
0a0fc960 TM |
2408 | do { |
2409 | spin_unlock(&pd->lock); | |
8aa7e847 | 2410 | congestion_wait(BLK_RW_ASYNC, HZ); |
0a0fc960 TM |
2411 | spin_lock(&pd->lock); |
2412 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2413 | } | |
2414 | spin_unlock(&pd->lock); | |
2415 | ||
1da177e4 LT |
2416 | /* |
2417 | * No matching packet found. Store the bio in the work queue. | |
2418 | */ | |
2419 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2420 | node->bio = bio; |
2421 | spin_lock(&pd->lock); | |
2422 | BUG_ON(pd->bio_queue_size < 0); | |
2423 | was_empty = (pd->bio_queue_size == 0); | |
2424 | pkt_rbtree_insert(pd, node); | |
2425 | spin_unlock(&pd->lock); | |
2426 | ||
2427 | /* | |
2428 | * Wake up the worker thread. | |
2429 | */ | |
2430 | atomic_set(&pd->scan_queue, 1); | |
2431 | if (was_empty) { | |
2432 | /* This wake_up is required for correct operation */ | |
2433 | wake_up(&pd->wqueue); | |
2434 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2435 | /* | |
2436 | * This wake up is not required for correct operation, | |
2437 | * but improves performance in some cases. | |
2438 | */ | |
2439 | wake_up(&pd->wqueue); | |
2440 | } | |
20d0189b KO |
2441 | } |
2442 | ||
2443 | static void pkt_make_request(struct request_queue *q, struct bio *bio) | |
2444 | { | |
2445 | struct pktcdvd_device *pd; | |
2446 | char b[BDEVNAME_SIZE]; | |
2447 | struct bio *split; | |
2448 | ||
2449 | pd = q->queuedata; | |
2450 | if (!pd) { | |
2451 | pr_err("%s incorrect request queue\n", | |
2452 | bdevname(bio->bi_bdev, b)); | |
2453 | goto end_io; | |
2454 | } | |
2455 | ||
2456 | pkt_dbg(2, pd, "start = %6llx stop = %6llx\n", | |
2457 | (unsigned long long)bio->bi_iter.bi_sector, | |
2458 | (unsigned long long)bio_end_sector(bio)); | |
2459 | ||
2460 | /* | |
2461 | * Clone READ bios so we can have our own bi_end_io callback. | |
2462 | */ | |
2463 | if (bio_data_dir(bio) == READ) { | |
2464 | pkt_make_request_read(pd, bio); | |
2465 | return; | |
2466 | } | |
2467 | ||
2468 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2469 | pkt_notice(pd, "WRITE for ro device (%llu)\n", | |
2470 | (unsigned long long)bio->bi_iter.bi_sector); | |
2471 | goto end_io; | |
2472 | } | |
2473 | ||
2474 | if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) { | |
2475 | pkt_err(pd, "wrong bio size\n"); | |
2476 | goto end_io; | |
2477 | } | |
2478 | ||
2479 | blk_queue_bounce(q, &bio); | |
2480 | ||
2481 | do { | |
2482 | sector_t zone = get_zone(bio->bi_iter.bi_sector, pd); | |
2483 | sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd); | |
2484 | ||
2485 | if (last_zone != zone) { | |
2486 | BUG_ON(last_zone != zone + pd->settings.size); | |
2487 | ||
2488 | split = bio_split(bio, last_zone - | |
2489 | bio->bi_iter.bi_sector, | |
2490 | GFP_NOIO, fs_bio_set); | |
2491 | bio_chain(split, bio); | |
2492 | } else { | |
2493 | split = bio; | |
2494 | } | |
2495 | ||
2496 | pkt_make_request_write(q, split); | |
2497 | } while (split != bio); | |
2498 | ||
5a7bbad2 | 2499 | return; |
1da177e4 | 2500 | end_io: |
6712ecf8 | 2501 | bio_io_error(bio); |
1da177e4 LT |
2502 | } |
2503 | ||
2504 | ||
2505 | ||
cc371e66 AK |
2506 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2507 | struct bio_vec *bvec) | |
1da177e4 LT |
2508 | { |
2509 | struct pktcdvd_device *pd = q->queuedata; | |
5323fb77 | 2510 | sector_t zone = get_zone(bmd->bi_sector, pd); |
cc371e66 | 2511 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; |
1da177e4 LT |
2512 | int remaining = (pd->settings.size << 9) - used; |
2513 | int remaining2; | |
2514 | ||
2515 | /* | |
2516 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2517 | * boundary, pkt_make_request() will split the bio. | |
2518 | */ | |
cc371e66 | 2519 | remaining2 = PAGE_SIZE - bmd->bi_size; |
1da177e4 LT |
2520 | remaining = max(remaining, remaining2); |
2521 | ||
2522 | BUG_ON(remaining < 0); | |
2523 | return remaining; | |
2524 | } | |
2525 | ||
2526 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2527 | { | |
165125e1 | 2528 | struct request_queue *q = pd->disk->queue; |
1da177e4 LT |
2529 | |
2530 | blk_queue_make_request(q, pkt_make_request); | |
e1defc4f | 2531 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
086fa5ff | 2532 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
1da177e4 LT |
2533 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
2534 | q->queuedata = pd; | |
2535 | } | |
2536 | ||
2537 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2538 | { | |
2539 | struct pktcdvd_device *pd = m->private; | |
2540 | char *msg; | |
2541 | char bdev_buf[BDEVNAME_SIZE]; | |
2542 | int states[PACKET_NUM_STATES]; | |
2543 | ||
2544 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2545 | bdevname(pd->bdev, bdev_buf)); | |
2546 | ||
2547 | seq_printf(m, "\nSettings:\n"); | |
2548 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2549 | ||
2550 | if (pd->settings.write_type == 0) | |
2551 | msg = "Packet"; | |
2552 | else | |
2553 | msg = "Unknown"; | |
2554 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2555 | ||
2556 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2557 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2558 | ||
2559 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2560 | ||
2561 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2562 | msg = "Mode 1"; | |
2563 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2564 | msg = "Mode 2"; | |
2565 | else | |
2566 | msg = "Unknown"; | |
2567 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2568 | ||
2569 | seq_printf(m, "\nStatistics:\n"); | |
2570 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2571 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2572 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2573 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2574 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2575 | ||
2576 | seq_printf(m, "\nMisc:\n"); | |
2577 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2578 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2579 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2580 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2581 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2582 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2583 | ||
2584 | seq_printf(m, "\nQueue state:\n"); | |
2585 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2586 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2587 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2588 | ||
2589 | pkt_count_states(pd, states); | |
2590 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2591 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2592 | ||
0a0fc960 TM |
2593 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2594 | pd->write_congestion_off, | |
2595 | pd->write_congestion_on); | |
1da177e4 LT |
2596 | return 0; |
2597 | } | |
2598 | ||
2599 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2600 | { | |
d9dda78b | 2601 | return single_open(file, pkt_seq_show, PDE_DATA(inode)); |
1da177e4 LT |
2602 | } |
2603 | ||
2b8693c0 | 2604 | static const struct file_operations pkt_proc_fops = { |
1da177e4 LT |
2605 | .open = pkt_seq_open, |
2606 | .read = seq_read, | |
2607 | .llseek = seq_lseek, | |
2608 | .release = single_release | |
2609 | }; | |
2610 | ||
2611 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2612 | { | |
2613 | int i; | |
2614 | int ret = 0; | |
2615 | char b[BDEVNAME_SIZE]; | |
1da177e4 LT |
2616 | struct block_device *bdev; |
2617 | ||
2618 | if (pd->pkt_dev == dev) { | |
fa63c0ab | 2619 | pkt_err(pd, "recursive setup not allowed\n"); |
1da177e4 LT |
2620 | return -EBUSY; |
2621 | } | |
2622 | for (i = 0; i < MAX_WRITERS; i++) { | |
2623 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2624 | if (!pd2) | |
2625 | continue; | |
2626 | if (pd2->bdev->bd_dev == dev) { | |
fa63c0ab JP |
2627 | pkt_err(pd, "%s already setup\n", |
2628 | bdevname(pd2->bdev, b)); | |
1da177e4 LT |
2629 | return -EBUSY; |
2630 | } | |
2631 | if (pd2->pkt_dev == dev) { | |
fa63c0ab | 2632 | pkt_err(pd, "can't chain pktcdvd devices\n"); |
1da177e4 LT |
2633 | return -EBUSY; |
2634 | } | |
2635 | } | |
2636 | ||
2637 | bdev = bdget(dev); | |
2638 | if (!bdev) | |
2639 | return -ENOMEM; | |
e525fd89 | 2640 | ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); |
1da177e4 LT |
2641 | if (ret) |
2642 | return ret; | |
2643 | ||
2644 | /* This is safe, since we have a reference from open(). */ | |
2645 | __module_get(THIS_MODULE); | |
2646 | ||
1da177e4 LT |
2647 | pd->bdev = bdev; |
2648 | set_blocksize(bdev, CD_FRAMESIZE); | |
2649 | ||
2650 | pkt_init_queue(pd); | |
2651 | ||
2652 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2653 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2654 | if (IS_ERR(pd->cdrw.thread)) { | |
fa63c0ab | 2655 | pkt_err(pd, "can't start kernel thread\n"); |
1da177e4 | 2656 | ret = -ENOMEM; |
e1bc89bc | 2657 | goto out_mem; |
1da177e4 LT |
2658 | } |
2659 | ||
c7705f34 | 2660 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
844aa797 | 2661 | pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b)); |
1da177e4 LT |
2662 | return 0; |
2663 | ||
1da177e4 | 2664 | out_mem: |
2cbed890 | 2665 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 LT |
2666 | /* This is safe: open() is still holding a reference. */ |
2667 | module_put(THIS_MODULE); | |
2668 | return ret; | |
2669 | } | |
2670 | ||
5e5e007c | 2671 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
1da177e4 | 2672 | { |
5e5e007c | 2673 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
8a6cfeb6 | 2674 | int ret; |
1da177e4 | 2675 | |
844aa797 | 2676 | pkt_dbg(2, pd, "cmd %x, dev %d:%d\n", |
cd3f2cd0 | 2677 | cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
1da177e4 | 2678 | |
2a48fc0a | 2679 | mutex_lock(&pktcdvd_mutex); |
1da177e4 | 2680 | switch (cmd) { |
a0eb62a0 AV |
2681 | case CDROMEJECT: |
2682 | /* | |
2683 | * The door gets locked when the device is opened, so we | |
2684 | * have to unlock it or else the eject command fails. | |
2685 | */ | |
2686 | if (pd->refcnt == 1) | |
2687 | pkt_lock_door(pd, 0); | |
2688 | /* fallthru */ | |
1da177e4 LT |
2689 | /* |
2690 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2691 | */ | |
2692 | case CDROMMULTISESSION: | |
2693 | case CDROMREADTOCENTRY: | |
2694 | case CDROM_LAST_WRITTEN: | |
2695 | case CDROM_SEND_PACKET: | |
2696 | case SCSI_IOCTL_SEND_COMMAND: | |
8a6cfeb6 AB |
2697 | ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg); |
2698 | break; | |
1da177e4 LT |
2699 | |
2700 | default: | |
844aa797 | 2701 | pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd); |
8a6cfeb6 | 2702 | ret = -ENOTTY; |
1da177e4 | 2703 | } |
2a48fc0a | 2704 | mutex_unlock(&pktcdvd_mutex); |
8560c650 | 2705 | |
8a6cfeb6 | 2706 | return ret; |
1da177e4 LT |
2707 | } |
2708 | ||
3c0d2060 TH |
2709 | static unsigned int pkt_check_events(struct gendisk *disk, |
2710 | unsigned int clearing) | |
1da177e4 LT |
2711 | { |
2712 | struct pktcdvd_device *pd = disk->private_data; | |
2713 | struct gendisk *attached_disk; | |
2714 | ||
2715 | if (!pd) | |
2716 | return 0; | |
2717 | if (!pd->bdev) | |
2718 | return 0; | |
2719 | attached_disk = pd->bdev->bd_disk; | |
3c0d2060 | 2720 | if (!attached_disk || !attached_disk->fops->check_events) |
1da177e4 | 2721 | return 0; |
3c0d2060 | 2722 | return attached_disk->fops->check_events(attached_disk, clearing); |
1da177e4 LT |
2723 | } |
2724 | ||
83d5cde4 | 2725 | static const struct block_device_operations pktcdvd_ops = { |
1da177e4 | 2726 | .owner = THIS_MODULE, |
5e5e007c AV |
2727 | .open = pkt_open, |
2728 | .release = pkt_close, | |
8a6cfeb6 | 2729 | .ioctl = pkt_ioctl, |
3c0d2060 | 2730 | .check_events = pkt_check_events, |
1da177e4 LT |
2731 | }; |
2732 | ||
2c9ede55 | 2733 | static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode) |
b03f38b6 KS |
2734 | { |
2735 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); | |
2736 | } | |
2737 | ||
1da177e4 LT |
2738 | /* |
2739 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2740 | */ | |
adb9250a | 2741 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2742 | { |
2743 | int idx; | |
2744 | int ret = -ENOMEM; | |
2745 | struct pktcdvd_device *pd; | |
2746 | struct gendisk *disk; | |
adb9250a TM |
2747 | |
2748 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2749 | |
2750 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2751 | if (!pkt_devs[idx]) | |
2752 | break; | |
2753 | if (idx == MAX_WRITERS) { | |
99481334 | 2754 | pr_err("max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2755 | ret = -EBUSY; |
2756 | goto out_mutex; | |
1da177e4 LT |
2757 | } |
2758 | ||
1107d2e0 | 2759 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2760 | if (!pd) |
adb9250a | 2761 | goto out_mutex; |
1da177e4 | 2762 | |
0eaae62a MD |
2763 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2764 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2765 | if (!pd->rb_pool) |
2766 | goto out_mem; | |
2767 | ||
e1bc89bc PO |
2768 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2769 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2770 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2771 | ||
1da177e4 LT |
2772 | spin_lock_init(&pd->lock); |
2773 | spin_lock_init(&pd->iosched.lock); | |
c5ecc484 AM |
2774 | bio_list_init(&pd->iosched.read_queue); |
2775 | bio_list_init(&pd->iosched.write_queue); | |
7822082d | 2776 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2777 | init_waitqueue_head(&pd->wqueue); |
2778 | pd->bio_queue = RB_ROOT; | |
2779 | ||
0a0fc960 TM |
2780 | pd->write_congestion_on = write_congestion_on; |
2781 | pd->write_congestion_off = write_congestion_off; | |
2782 | ||
adb9250a TM |
2783 | disk = alloc_disk(1); |
2784 | if (!disk) | |
2785 | goto out_mem; | |
2786 | pd->disk = disk; | |
add21660 | 2787 | disk->major = pktdev_major; |
1da177e4 LT |
2788 | disk->first_minor = idx; |
2789 | disk->fops = &pktcdvd_ops; | |
2790 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2791 | strcpy(disk->disk_name, pd->name); |
e454cea2 | 2792 | disk->devnode = pktcdvd_devnode; |
1da177e4 LT |
2793 | disk->private_data = pd; |
2794 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2795 | if (!disk->queue) | |
2796 | goto out_mem2; | |
2797 | ||
f331c029 | 2798 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2799 | ret = pkt_new_dev(pd, dev); |
2800 | if (ret) | |
2801 | goto out_new_dev; | |
2802 | ||
3c0d2060 TH |
2803 | /* inherit events of the host device */ |
2804 | disk->events = pd->bdev->bd_disk->events; | |
2805 | disk->async_events = pd->bdev->bd_disk->async_events; | |
2806 | ||
1da177e4 | 2807 | add_disk(disk); |
adb9250a | 2808 | |
32694850 TM |
2809 | pkt_sysfs_dev_new(pd); |
2810 | pkt_debugfs_dev_new(pd); | |
2811 | ||
1da177e4 | 2812 | pkt_devs[idx] = pd; |
adb9250a TM |
2813 | if (pkt_dev) |
2814 | *pkt_dev = pd->pkt_dev; | |
2815 | ||
2816 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2817 | return 0; |
2818 | ||
2819 | out_new_dev: | |
1312f40e | 2820 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2821 | out_mem2: |
2822 | put_disk(disk); | |
2823 | out_mem: | |
2824 | if (pd->rb_pool) | |
2825 | mempool_destroy(pd->rb_pool); | |
2826 | kfree(pd); | |
adb9250a TM |
2827 | out_mutex: |
2828 | mutex_unlock(&ctl_mutex); | |
99481334 | 2829 | pr_err("setup of pktcdvd device failed\n"); |
1da177e4 LT |
2830 | return ret; |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2835 | */ | |
adb9250a | 2836 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2837 | { |
2838 | struct pktcdvd_device *pd; | |
2839 | int idx; | |
adb9250a TM |
2840 | int ret = 0; |
2841 | ||
2842 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2843 | |
2844 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2845 | pd = pkt_devs[idx]; | |
2846 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2847 | break; | |
2848 | } | |
2849 | if (idx == MAX_WRITERS) { | |
666dc7c9 | 2850 | pr_debug("dev not setup\n"); |
adb9250a TM |
2851 | ret = -ENXIO; |
2852 | goto out; | |
1da177e4 LT |
2853 | } |
2854 | ||
adb9250a TM |
2855 | if (pd->refcnt > 0) { |
2856 | ret = -EBUSY; | |
2857 | goto out; | |
2858 | } | |
1da177e4 LT |
2859 | if (!IS_ERR(pd->cdrw.thread)) |
2860 | kthread_stop(pd->cdrw.thread); | |
2861 | ||
32694850 TM |
2862 | pkt_devs[idx] = NULL; |
2863 | ||
2864 | pkt_debugfs_dev_remove(pd); | |
2865 | pkt_sysfs_dev_remove(pd); | |
2866 | ||
2cbed890 | 2867 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 | 2868 | |
1da177e4 | 2869 | remove_proc_entry(pd->name, pkt_proc); |
844aa797 | 2870 | pkt_dbg(1, pd, "writer unmapped\n"); |
1da177e4 LT |
2871 | |
2872 | del_gendisk(pd->disk); | |
1312f40e | 2873 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2874 | put_disk(pd->disk); |
2875 | ||
1da177e4 LT |
2876 | mempool_destroy(pd->rb_pool); |
2877 | kfree(pd); | |
2878 | ||
2879 | /* This is safe: open() is still holding a reference. */ | |
2880 | module_put(THIS_MODULE); | |
adb9250a TM |
2881 | |
2882 | out: | |
2883 | mutex_unlock(&ctl_mutex); | |
2884 | return ret; | |
1da177e4 LT |
2885 | } |
2886 | ||
2887 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2888 | { | |
adb9250a TM |
2889 | struct pktcdvd_device *pd; |
2890 | ||
2891 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2892 | ||
2893 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2894 | if (pd) { |
2895 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2896 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2897 | } else { | |
2898 | ctrl_cmd->dev = 0; | |
2899 | ctrl_cmd->pkt_dev = 0; | |
2900 | } | |
2901 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2902 | |
2903 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2904 | } |
2905 | ||
f80a0ca6 | 2906 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
2907 | { |
2908 | void __user *argp = (void __user *)arg; | |
2909 | struct pkt_ctrl_command ctrl_cmd; | |
2910 | int ret = 0; | |
adb9250a | 2911 | dev_t pkt_dev = 0; |
1da177e4 LT |
2912 | |
2913 | if (cmd != PACKET_CTRL_CMD) | |
2914 | return -ENOTTY; | |
2915 | ||
2916 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2917 | return -EFAULT; | |
2918 | ||
2919 | switch (ctrl_cmd.command) { | |
2920 | case PKT_CTRL_CMD_SETUP: | |
2921 | if (!capable(CAP_SYS_ADMIN)) | |
2922 | return -EPERM; | |
adb9250a TM |
2923 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
2924 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
2925 | break; |
2926 | case PKT_CTRL_CMD_TEARDOWN: | |
2927 | if (!capable(CAP_SYS_ADMIN)) | |
2928 | return -EPERM; | |
adb9250a | 2929 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
2930 | break; |
2931 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 2932 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
2933 | break; |
2934 | default: | |
2935 | return -ENOTTY; | |
2936 | } | |
2937 | ||
2938 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2939 | return -EFAULT; | |
2940 | return ret; | |
2941 | } | |
2942 | ||
f80a0ca6 AB |
2943 | #ifdef CONFIG_COMPAT |
2944 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2945 | { | |
2946 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
2947 | } | |
2948 | #endif | |
1da177e4 | 2949 | |
2b8693c0 | 2950 | static const struct file_operations pkt_ctl_fops = { |
f80a0ca6 AB |
2951 | .open = nonseekable_open, |
2952 | .unlocked_ioctl = pkt_ctl_ioctl, | |
2953 | #ifdef CONFIG_COMPAT | |
2954 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
2955 | #endif | |
2956 | .owner = THIS_MODULE, | |
6038f373 | 2957 | .llseek = no_llseek, |
1da177e4 LT |
2958 | }; |
2959 | ||
2960 | static struct miscdevice pkt_misc = { | |
2961 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 2962 | .name = DRIVER_NAME, |
e454cea2 | 2963 | .nodename = "pktcdvd/control", |
1da177e4 LT |
2964 | .fops = &pkt_ctl_fops |
2965 | }; | |
2966 | ||
2967 | static int __init pkt_init(void) | |
2968 | { | |
2969 | int ret; | |
2970 | ||
32694850 TM |
2971 | mutex_init(&ctl_mutex); |
2972 | ||
0eaae62a MD |
2973 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
2974 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
2975 | if (!psd_pool) |
2976 | return -ENOMEM; | |
2977 | ||
add21660 | 2978 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2979 | if (ret < 0) { |
99481334 | 2980 | pr_err("unable to register block device\n"); |
1da177e4 LT |
2981 | goto out2; |
2982 | } | |
add21660 TM |
2983 | if (!pktdev_major) |
2984 | pktdev_major = ret; | |
1da177e4 | 2985 | |
32694850 TM |
2986 | ret = pkt_sysfs_init(); |
2987 | if (ret) | |
2988 | goto out; | |
2989 | ||
2990 | pkt_debugfs_init(); | |
2991 | ||
1da177e4 LT |
2992 | ret = misc_register(&pkt_misc); |
2993 | if (ret) { | |
99481334 | 2994 | pr_err("unable to register misc device\n"); |
32694850 | 2995 | goto out_misc; |
1da177e4 LT |
2996 | } |
2997 | ||
928b4d8c | 2998 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2999 | |
1da177e4 LT |
3000 | return 0; |
3001 | ||
32694850 TM |
3002 | out_misc: |
3003 | pkt_debugfs_cleanup(); | |
3004 | pkt_sysfs_cleanup(); | |
1da177e4 | 3005 | out: |
add21660 | 3006 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3007 | out2: |
3008 | mempool_destroy(psd_pool); | |
3009 | return ret; | |
3010 | } | |
3011 | ||
3012 | static void __exit pkt_exit(void) | |
3013 | { | |
928b4d8c | 3014 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3015 | misc_deregister(&pkt_misc); |
32694850 TM |
3016 | |
3017 | pkt_debugfs_cleanup(); | |
3018 | pkt_sysfs_cleanup(); | |
3019 | ||
add21660 | 3020 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3021 | mempool_destroy(psd_pool); |
3022 | } | |
3023 | ||
3024 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3025 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3026 | MODULE_LICENSE("GPL"); | |
3027 | ||
3028 | module_init(pkt_init); | |
3029 | module_exit(pkt_exit); |