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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
adb9250a | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
1da177e4 LT |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
a676f8d0 PO |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. | |
1da177e4 LT |
11 | * |
12 | * Theory of operation: | |
13 | * | |
a676f8d0 PO |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
15 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, | |
16 | * but it doesn't know anything about the special restrictions that apply to | |
17 | * packet writing. One restriction is that write requests must be aligned to | |
18 | * packet boundaries on the physical media, and the size of a write request | |
19 | * must be equal to the packet size. Another restriction is that a | |
20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read | |
21 | * command, if the previous command was a write. | |
22 | * | |
23 | * The purpose of the packet writing driver is to hide these restrictions from | |
24 | * higher layers, such as file systems, and present a block device that can be | |
25 | * randomly read and written using 2kB-sized blocks. | |
26 | * | |
27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. | |
28 | * Its data is defined by the struct packet_iosched and includes two bio | |
29 | * queues with pending read and write requests. These queues are processed | |
30 | * by the pkt_iosched_process_queue() function. The write requests in this | |
31 | * queue are already properly aligned and sized. This layer is responsible for | |
32 | * issuing the flush cache commands and scheduling the I/O in a good order. | |
33 | * | |
34 | * The next layer transforms unaligned write requests to aligned writes. This | |
35 | * transformation requires reading missing pieces of data from the underlying | |
36 | * block device, assembling the pieces to full packets and queuing them to the | |
37 | * packet I/O scheduler. | |
38 | * | |
39 | * At the top layer there is a custom make_request_fn function that forwards | |
40 | * read requests directly to the iosched queue and puts write requests in the | |
41 | * unaligned write queue. A kernel thread performs the necessary read | |
42 | * gathering to convert the unaligned writes to aligned writes and then feeds | |
43 | * them to the packet I/O scheduler. | |
1da177e4 LT |
44 | * |
45 | *************************************************************************/ | |
46 | ||
1da177e4 | 47 | #include <linux/pktcdvd.h> |
1da177e4 LT |
48 | #include <linux/module.h> |
49 | #include <linux/types.h> | |
50 | #include <linux/kernel.h> | |
f80a0ca6 | 51 | #include <linux/compat.h> |
1da177e4 LT |
52 | #include <linux/kthread.h> |
53 | #include <linux/errno.h> | |
54 | #include <linux/spinlock.h> | |
55 | #include <linux/file.h> | |
56 | #include <linux/proc_fs.h> | |
57 | #include <linux/seq_file.h> | |
58 | #include <linux/miscdevice.h> | |
7dfb7103 | 59 | #include <linux/freezer.h> |
1657f824 | 60 | #include <linux/mutex.h> |
5a0e3ad6 | 61 | #include <linux/slab.h> |
1da177e4 LT |
62 | #include <scsi/scsi_cmnd.h> |
63 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 64 | #include <scsi/scsi.h> |
32694850 TM |
65 | #include <linux/debugfs.h> |
66 | #include <linux/device.h> | |
1da177e4 LT |
67 | |
68 | #include <asm/uaccess.h> | |
69 | ||
7822082d TM |
70 | #define DRIVER_NAME "pktcdvd" |
71 | ||
1da177e4 LT |
72 | #if PACKET_DEBUG |
73 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
74 | #else | |
75 | #define DPRINTK(fmt, args...) | |
76 | #endif | |
77 | ||
78 | #if PACKET_DEBUG > 1 | |
79 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
80 | #else | |
81 | #define VPRINTK(fmt, args...) | |
82 | #endif | |
83 | ||
84 | #define MAX_SPEED 0xffff | |
85 | ||
86 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) | |
87 | ||
2a48fc0a | 88 | static DEFINE_MUTEX(pktcdvd_mutex); |
1da177e4 LT |
89 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
90 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 91 | static int pktdev_major; |
0a0fc960 TM |
92 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
93 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 94 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
95 | static mempool_t *psd_pool; |
96 | ||
32694850 | 97 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
ea5ffff5 | 98 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
32694850 TM |
99 | |
100 | /* forward declaration */ | |
101 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
102 | static int pkt_remove_dev(dev_t pkt_dev); | |
103 | static int pkt_seq_show(struct seq_file *m, void *p); | |
104 | ||
105 | ||
106 | ||
107 | /* | |
108 | * create and register a pktcdvd kernel object. | |
109 | */ | |
110 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
111 | const char* name, | |
112 | struct kobject* parent, | |
113 | struct kobj_type* ktype) | |
114 | { | |
115 | struct pktcdvd_kobj *p; | |
89c42606 GKH |
116 | int error; |
117 | ||
32694850 TM |
118 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
119 | if (!p) | |
120 | return NULL; | |
32694850 | 121 | p->pd = pd; |
89c42606 GKH |
122 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
123 | if (error) { | |
d17a18dd | 124 | kobject_put(&p->kobj); |
32694850 | 125 | return NULL; |
d17a18dd | 126 | } |
89c42606 | 127 | kobject_uevent(&p->kobj, KOBJ_ADD); |
32694850 TM |
128 | return p; |
129 | } | |
130 | /* | |
131 | * remove a pktcdvd kernel object. | |
132 | */ | |
133 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
134 | { | |
135 | if (p) | |
c10997f6 | 136 | kobject_put(&p->kobj); |
32694850 TM |
137 | } |
138 | /* | |
139 | * default release function for pktcdvd kernel objects. | |
140 | */ | |
141 | static void pkt_kobj_release(struct kobject *kobj) | |
142 | { | |
143 | kfree(to_pktcdvdkobj(kobj)); | |
144 | } | |
145 | ||
146 | ||
147 | /********************************************************** | |
148 | * | |
149 | * sysfs interface for pktcdvd | |
150 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
151 | * | |
152 | **********************************************************/ | |
153 | ||
154 | #define DEF_ATTR(_obj,_name,_mode) \ | |
7b595756 | 155 | static struct attribute _obj = { .name = _name, .mode = _mode } |
32694850 TM |
156 | |
157 | /********************************************************** | |
158 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
159 | stat/reset | |
160 | stat/packets_started | |
161 | stat/packets_finished | |
162 | stat/kb_written | |
163 | stat/kb_read | |
164 | stat/kb_read_gather | |
165 | write_queue/size | |
166 | write_queue/congestion_off | |
167 | write_queue/congestion_on | |
168 | **********************************************************/ | |
169 | ||
170 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
171 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
172 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
173 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
174 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
175 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
176 | ||
177 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
178 | &kobj_pkt_attr_st1, | |
179 | &kobj_pkt_attr_st2, | |
180 | &kobj_pkt_attr_st3, | |
181 | &kobj_pkt_attr_st4, | |
182 | &kobj_pkt_attr_st5, | |
183 | &kobj_pkt_attr_st6, | |
184 | NULL | |
185 | }; | |
186 | ||
187 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
188 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
189 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
190 | ||
191 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
192 | &kobj_pkt_attr_wq1, | |
193 | &kobj_pkt_attr_wq2, | |
194 | &kobj_pkt_attr_wq3, | |
195 | NULL | |
196 | }; | |
197 | ||
32694850 TM |
198 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
199 | struct attribute *attr, char *data) | |
200 | { | |
201 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
202 | int n = 0; | |
203 | int v; | |
204 | if (strcmp(attr->name, "packets_started") == 0) { | |
205 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
206 | ||
207 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
208 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
209 | ||
210 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
211 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
212 | ||
213 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
214 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
215 | ||
216 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
217 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
218 | ||
219 | } else if (strcmp(attr->name, "size") == 0) { | |
220 | spin_lock(&pd->lock); | |
221 | v = pd->bio_queue_size; | |
222 | spin_unlock(&pd->lock); | |
223 | n = sprintf(data, "%d\n", v); | |
224 | ||
225 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
226 | spin_lock(&pd->lock); | |
227 | v = pd->write_congestion_off; | |
228 | spin_unlock(&pd->lock); | |
229 | n = sprintf(data, "%d\n", v); | |
230 | ||
231 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
232 | spin_lock(&pd->lock); | |
233 | v = pd->write_congestion_on; | |
234 | spin_unlock(&pd->lock); | |
235 | n = sprintf(data, "%d\n", v); | |
236 | } | |
237 | return n; | |
238 | } | |
239 | ||
240 | static void init_write_congestion_marks(int* lo, int* hi) | |
241 | { | |
242 | if (*hi > 0) { | |
243 | *hi = max(*hi, 500); | |
244 | *hi = min(*hi, 1000000); | |
245 | if (*lo <= 0) | |
246 | *lo = *hi - 100; | |
247 | else { | |
248 | *lo = min(*lo, *hi - 100); | |
249 | *lo = max(*lo, 100); | |
250 | } | |
251 | } else { | |
252 | *hi = -1; | |
253 | *lo = -1; | |
254 | } | |
255 | } | |
256 | ||
257 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
258 | struct attribute *attr, | |
259 | const char *data, size_t len) | |
260 | { | |
261 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
262 | int val; | |
32694850 | 263 | |
83f3aa3d | 264 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
32694850 TM |
265 | pd->stats.pkt_started = 0; |
266 | pd->stats.pkt_ended = 0; | |
267 | pd->stats.secs_w = 0; | |
268 | pd->stats.secs_rg = 0; | |
269 | pd->stats.secs_r = 0; | |
270 | ||
271 | } else if (strcmp(attr->name, "congestion_off") == 0 | |
83f3aa3d | 272 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
273 | spin_lock(&pd->lock); |
274 | pd->write_congestion_off = val; | |
275 | init_write_congestion_marks(&pd->write_congestion_off, | |
276 | &pd->write_congestion_on); | |
277 | spin_unlock(&pd->lock); | |
278 | ||
279 | } else if (strcmp(attr->name, "congestion_on") == 0 | |
83f3aa3d | 280 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
281 | spin_lock(&pd->lock); |
282 | pd->write_congestion_on = val; | |
283 | init_write_congestion_marks(&pd->write_congestion_off, | |
284 | &pd->write_congestion_on); | |
285 | spin_unlock(&pd->lock); | |
286 | } | |
287 | return len; | |
288 | } | |
289 | ||
52cf25d0 | 290 | static const struct sysfs_ops kobj_pkt_ops = { |
32694850 TM |
291 | .show = kobj_pkt_show, |
292 | .store = kobj_pkt_store | |
293 | }; | |
294 | static struct kobj_type kobj_pkt_type_stat = { | |
295 | .release = pkt_kobj_release, | |
296 | .sysfs_ops = &kobj_pkt_ops, | |
297 | .default_attrs = kobj_pkt_attrs_stat | |
298 | }; | |
299 | static struct kobj_type kobj_pkt_type_wqueue = { | |
300 | .release = pkt_kobj_release, | |
301 | .sysfs_ops = &kobj_pkt_ops, | |
302 | .default_attrs = kobj_pkt_attrs_wqueue | |
303 | }; | |
304 | ||
305 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
306 | { | |
307 | if (class_pktcdvd) { | |
cba76717 | 308 | pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
1ff9f542 | 309 | "%s", pd->name); |
6013c12b TJ |
310 | if (IS_ERR(pd->dev)) |
311 | pd->dev = NULL; | |
32694850 | 312 | } |
6013c12b | 313 | if (pd->dev) { |
32694850 | 314 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
6013c12b | 315 | &pd->dev->kobj, |
32694850 TM |
316 | &kobj_pkt_type_stat); |
317 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
6013c12b | 318 | &pd->dev->kobj, |
32694850 TM |
319 | &kobj_pkt_type_wqueue); |
320 | } | |
321 | } | |
322 | ||
323 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
324 | { | |
325 | pkt_kobj_remove(pd->kobj_stat); | |
326 | pkt_kobj_remove(pd->kobj_wqueue); | |
327 | if (class_pktcdvd) | |
ca0bf64d | 328 | device_unregister(pd->dev); |
32694850 TM |
329 | } |
330 | ||
331 | ||
332 | /******************************************************************** | |
333 | /sys/class/pktcdvd/ | |
334 | add map block device | |
335 | remove unmap packet dev | |
336 | device_map show mappings | |
337 | *******************************************************************/ | |
338 | ||
339 | static void class_pktcdvd_release(struct class *cls) | |
340 | { | |
341 | kfree(cls); | |
342 | } | |
28812fe1 AK |
343 | static ssize_t class_pktcdvd_show_map(struct class *c, |
344 | struct class_attribute *attr, | |
345 | char *data) | |
32694850 TM |
346 | { |
347 | int n = 0; | |
348 | int idx; | |
349 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
350 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
351 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
352 | if (!pd) | |
353 | continue; | |
354 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
355 | pd->name, | |
356 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
357 | MAJOR(pd->bdev->bd_dev), | |
358 | MINOR(pd->bdev->bd_dev)); | |
359 | } | |
360 | mutex_unlock(&ctl_mutex); | |
361 | return n; | |
362 | } | |
363 | ||
28812fe1 AK |
364 | static ssize_t class_pktcdvd_store_add(struct class *c, |
365 | struct class_attribute *attr, | |
366 | const char *buf, | |
32694850 TM |
367 | size_t count) |
368 | { | |
369 | unsigned int major, minor; | |
fffe487d | 370 | |
83f3aa3d | 371 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
fffe487d TH |
372 | /* pkt_setup_dev() expects caller to hold reference to self */ |
373 | if (!try_module_get(THIS_MODULE)) | |
374 | return -ENODEV; | |
375 | ||
32694850 | 376 | pkt_setup_dev(MKDEV(major, minor), NULL); |
fffe487d TH |
377 | |
378 | module_put(THIS_MODULE); | |
379 | ||
32694850 TM |
380 | return count; |
381 | } | |
fffe487d | 382 | |
32694850 TM |
383 | return -EINVAL; |
384 | } | |
385 | ||
28812fe1 AK |
386 | static ssize_t class_pktcdvd_store_remove(struct class *c, |
387 | struct class_attribute *attr, | |
388 | const char *buf, | |
32694850 TM |
389 | size_t count) |
390 | { | |
391 | unsigned int major, minor; | |
83f3aa3d | 392 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
32694850 TM |
393 | pkt_remove_dev(MKDEV(major, minor)); |
394 | return count; | |
395 | } | |
396 | return -EINVAL; | |
397 | } | |
398 | ||
399 | static struct class_attribute class_pktcdvd_attrs[] = { | |
400 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
401 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
402 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
403 | __ATTR_NULL | |
404 | }; | |
405 | ||
406 | ||
407 | static int pkt_sysfs_init(void) | |
408 | { | |
409 | int ret = 0; | |
410 | ||
411 | /* | |
412 | * create control files in sysfs | |
413 | * /sys/class/pktcdvd/... | |
414 | */ | |
415 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
416 | if (!class_pktcdvd) | |
417 | return -ENOMEM; | |
418 | class_pktcdvd->name = DRIVER_NAME; | |
419 | class_pktcdvd->owner = THIS_MODULE; | |
420 | class_pktcdvd->class_release = class_pktcdvd_release; | |
421 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
422 | ret = class_register(class_pktcdvd); | |
423 | if (ret) { | |
424 | kfree(class_pktcdvd); | |
425 | class_pktcdvd = NULL; | |
426 | printk(DRIVER_NAME": failed to create class pktcdvd\n"); | |
427 | return ret; | |
428 | } | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static void pkt_sysfs_cleanup(void) | |
433 | { | |
434 | if (class_pktcdvd) | |
435 | class_destroy(class_pktcdvd); | |
436 | class_pktcdvd = NULL; | |
437 | } | |
438 | ||
439 | /******************************************************************** | |
440 | entries in debugfs | |
441 | ||
156f5a78 | 442 | /sys/kernel/debug/pktcdvd[0-7]/ |
32694850 TM |
443 | info |
444 | ||
445 | *******************************************************************/ | |
446 | ||
447 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
448 | { | |
449 | return pkt_seq_show(m, p); | |
450 | } | |
451 | ||
452 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
453 | { | |
454 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
455 | } | |
456 | ||
2b8693c0 | 457 | static const struct file_operations debug_fops = { |
32694850 TM |
458 | .open = pkt_debugfs_fops_open, |
459 | .read = seq_read, | |
460 | .llseek = seq_lseek, | |
461 | .release = single_release, | |
462 | .owner = THIS_MODULE, | |
463 | }; | |
464 | ||
465 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
466 | { | |
467 | if (!pkt_debugfs_root) | |
468 | return; | |
469 | pd->dfs_f_info = NULL; | |
470 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); | |
471 | if (IS_ERR(pd->dfs_d_root)) { | |
472 | pd->dfs_d_root = NULL; | |
473 | return; | |
474 | } | |
475 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, | |
476 | pd->dfs_d_root, pd, &debug_fops); | |
477 | if (IS_ERR(pd->dfs_f_info)) { | |
478 | pd->dfs_f_info = NULL; | |
479 | return; | |
480 | } | |
481 | } | |
482 | ||
483 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
484 | { | |
485 | if (!pkt_debugfs_root) | |
486 | return; | |
487 | if (pd->dfs_f_info) | |
488 | debugfs_remove(pd->dfs_f_info); | |
489 | pd->dfs_f_info = NULL; | |
490 | if (pd->dfs_d_root) | |
491 | debugfs_remove(pd->dfs_d_root); | |
492 | pd->dfs_d_root = NULL; | |
493 | } | |
494 | ||
495 | static void pkt_debugfs_init(void) | |
496 | { | |
497 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
498 | if (IS_ERR(pkt_debugfs_root)) { | |
499 | pkt_debugfs_root = NULL; | |
500 | return; | |
501 | } | |
502 | } | |
503 | ||
504 | static void pkt_debugfs_cleanup(void) | |
505 | { | |
506 | if (!pkt_debugfs_root) | |
507 | return; | |
508 | debugfs_remove(pkt_debugfs_root); | |
509 | pkt_debugfs_root = NULL; | |
510 | } | |
511 | ||
512 | /* ----------------------------------------------------------*/ | |
513 | ||
1da177e4 LT |
514 | |
515 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
516 | { | |
517 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
518 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
7822082d | 519 | VPRINTK(DRIVER_NAME": queue empty\n"); |
1da177e4 LT |
520 | atomic_set(&pd->iosched.attention, 1); |
521 | wake_up(&pd->wqueue); | |
522 | } | |
523 | } | |
524 | ||
525 | static void pkt_bio_destructor(struct bio *bio) | |
526 | { | |
527 | kfree(bio->bi_io_vec); | |
528 | kfree(bio); | |
529 | } | |
530 | ||
531 | static struct bio *pkt_bio_alloc(int nr_iovecs) | |
532 | { | |
533 | struct bio_vec *bvl = NULL; | |
534 | struct bio *bio; | |
535 | ||
536 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); | |
537 | if (!bio) | |
538 | goto no_bio; | |
539 | bio_init(bio); | |
540 | ||
1107d2e0 | 541 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
1da177e4 LT |
542 | if (!bvl) |
543 | goto no_bvl; | |
1da177e4 LT |
544 | |
545 | bio->bi_max_vecs = nr_iovecs; | |
546 | bio->bi_io_vec = bvl; | |
547 | bio->bi_destructor = pkt_bio_destructor; | |
548 | ||
549 | return bio; | |
550 | ||
551 | no_bvl: | |
552 | kfree(bio); | |
553 | no_bio: | |
554 | return NULL; | |
555 | } | |
556 | ||
557 | /* | |
558 | * Allocate a packet_data struct | |
559 | */ | |
e1bc89bc | 560 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
561 | { |
562 | int i; | |
563 | struct packet_data *pkt; | |
564 | ||
1107d2e0 | 565 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
566 | if (!pkt) |
567 | goto no_pkt; | |
1da177e4 | 568 | |
e1bc89bc PO |
569 | pkt->frames = frames; |
570 | pkt->w_bio = pkt_bio_alloc(frames); | |
1da177e4 LT |
571 | if (!pkt->w_bio) |
572 | goto no_bio; | |
573 | ||
e1bc89bc | 574 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
575 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
576 | if (!pkt->pages[i]) | |
577 | goto no_page; | |
578 | } | |
579 | ||
580 | spin_lock_init(&pkt->lock); | |
c5ecc484 | 581 | bio_list_init(&pkt->orig_bios); |
1da177e4 | 582 | |
e1bc89bc | 583 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
584 | struct bio *bio = pkt_bio_alloc(1); |
585 | if (!bio) | |
586 | goto no_rd_bio; | |
587 | pkt->r_bios[i] = bio; | |
588 | } | |
589 | ||
590 | return pkt; | |
591 | ||
592 | no_rd_bio: | |
e1bc89bc | 593 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
594 | struct bio *bio = pkt->r_bios[i]; |
595 | if (bio) | |
596 | bio_put(bio); | |
597 | } | |
598 | ||
599 | no_page: | |
e1bc89bc | 600 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
601 | if (pkt->pages[i]) |
602 | __free_page(pkt->pages[i]); | |
603 | bio_put(pkt->w_bio); | |
604 | no_bio: | |
605 | kfree(pkt); | |
606 | no_pkt: | |
607 | return NULL; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Free a packet_data struct | |
612 | */ | |
613 | static void pkt_free_packet_data(struct packet_data *pkt) | |
614 | { | |
615 | int i; | |
616 | ||
e1bc89bc | 617 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
618 | struct bio *bio = pkt->r_bios[i]; |
619 | if (bio) | |
620 | bio_put(bio); | |
621 | } | |
e1bc89bc | 622 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
623 | __free_page(pkt->pages[i]); |
624 | bio_put(pkt->w_bio); | |
625 | kfree(pkt); | |
626 | } | |
627 | ||
628 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
629 | { | |
630 | struct packet_data *pkt, *next; | |
631 | ||
632 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
633 | ||
634 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
635 | pkt_free_packet_data(pkt); | |
636 | } | |
e1bc89bc | 637 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
638 | } |
639 | ||
640 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
641 | { | |
642 | struct packet_data *pkt; | |
643 | ||
e1bc89bc PO |
644 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
645 | ||
1da177e4 | 646 | while (nr_packets > 0) { |
e1bc89bc | 647 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
648 | if (!pkt) { |
649 | pkt_shrink_pktlist(pd); | |
650 | return 0; | |
651 | } | |
652 | pkt->id = nr_packets; | |
653 | pkt->pd = pd; | |
654 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
655 | nr_packets--; | |
656 | } | |
657 | return 1; | |
658 | } | |
659 | ||
1da177e4 LT |
660 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
661 | { | |
662 | struct rb_node *n = rb_next(&node->rb_node); | |
663 | if (!n) | |
664 | return NULL; | |
665 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
666 | } | |
667 | ||
ac893963 | 668 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
669 | { |
670 | rb_erase(&node->rb_node, &pd->bio_queue); | |
671 | mempool_free(node, pd->rb_pool); | |
672 | pd->bio_queue_size--; | |
673 | BUG_ON(pd->bio_queue_size < 0); | |
674 | } | |
675 | ||
676 | /* | |
677 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
678 | */ | |
679 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
680 | { | |
681 | struct rb_node *n = pd->bio_queue.rb_node; | |
682 | struct rb_node *next; | |
683 | struct pkt_rb_node *tmp; | |
684 | ||
685 | if (!n) { | |
686 | BUG_ON(pd->bio_queue_size > 0); | |
687 | return NULL; | |
688 | } | |
689 | ||
690 | for (;;) { | |
691 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
692 | if (s <= tmp->bio->bi_sector) | |
693 | next = n->rb_left; | |
694 | else | |
695 | next = n->rb_right; | |
696 | if (!next) | |
697 | break; | |
698 | n = next; | |
699 | } | |
700 | ||
701 | if (s > tmp->bio->bi_sector) { | |
702 | tmp = pkt_rbtree_next(tmp); | |
703 | if (!tmp) | |
704 | return NULL; | |
705 | } | |
706 | BUG_ON(s > tmp->bio->bi_sector); | |
707 | return tmp; | |
708 | } | |
709 | ||
710 | /* | |
711 | * Insert a node into the pd->bio_queue rb tree. | |
712 | */ | |
713 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
714 | { | |
715 | struct rb_node **p = &pd->bio_queue.rb_node; | |
716 | struct rb_node *parent = NULL; | |
717 | sector_t s = node->bio->bi_sector; | |
718 | struct pkt_rb_node *tmp; | |
719 | ||
720 | while (*p) { | |
721 | parent = *p; | |
722 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
723 | if (s < tmp->bio->bi_sector) | |
724 | p = &(*p)->rb_left; | |
725 | else | |
726 | p = &(*p)->rb_right; | |
727 | } | |
728 | rb_link_node(&node->rb_node, parent, p); | |
729 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
730 | pd->bio_queue_size++; | |
731 | } | |
732 | ||
1da177e4 LT |
733 | /* |
734 | * Send a packet_command to the underlying block device and | |
735 | * wait for completion. | |
736 | */ | |
737 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
738 | { | |
165125e1 | 739 | struct request_queue *q = bdev_get_queue(pd->bdev); |
1da177e4 | 740 | struct request *rq; |
406c9b60 CH |
741 | int ret = 0; |
742 | ||
743 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
744 | WRITE : READ, __GFP_WAIT); | |
745 | ||
746 | if (cgc->buflen) { | |
747 | if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT)) | |
748 | goto out; | |
749 | } | |
1da177e4 | 750 | |
91e4ee38 | 751 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
406c9b60 | 752 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
1da177e4 | 753 | |
1da177e4 | 754 | rq->timeout = 60*HZ; |
4aff5e23 | 755 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
1da177e4 | 756 | if (cgc->quiet) |
4aff5e23 | 757 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 | 758 | |
406c9b60 | 759 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
cbc31a47 AM |
760 | if (rq->errors) |
761 | ret = -EIO; | |
406c9b60 | 762 | out: |
1da177e4 | 763 | blk_put_request(rq); |
406c9b60 | 764 | return ret; |
1da177e4 LT |
765 | } |
766 | ||
767 | /* | |
768 | * A generic sense dump / resolve mechanism should be implemented across | |
769 | * all ATAPI + SCSI devices. | |
770 | */ | |
771 | static void pkt_dump_sense(struct packet_command *cgc) | |
772 | { | |
773 | static char *info[9] = { "No sense", "Recovered error", "Not ready", | |
774 | "Medium error", "Hardware error", "Illegal request", | |
775 | "Unit attention", "Data protect", "Blank check" }; | |
776 | int i; | |
777 | struct request_sense *sense = cgc->sense; | |
778 | ||
7822082d | 779 | printk(DRIVER_NAME":"); |
1da177e4 LT |
780 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
781 | printk(" %02x", cgc->cmd[i]); | |
782 | printk(" - "); | |
783 | ||
784 | if (sense == NULL) { | |
785 | printk("no sense\n"); | |
786 | return; | |
787 | } | |
788 | ||
789 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); | |
790 | ||
791 | if (sense->sense_key > 8) { | |
792 | printk(" (INVALID)\n"); | |
793 | return; | |
794 | } | |
795 | ||
796 | printk(" (%s)\n", info[sense->sense_key]); | |
797 | } | |
798 | ||
799 | /* | |
800 | * flush the drive cache to media | |
801 | */ | |
802 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
803 | { | |
804 | struct packet_command cgc; | |
805 | ||
806 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
807 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
808 | cgc.quiet = 1; | |
809 | ||
810 | /* | |
811 | * the IMMED bit -- we default to not setting it, although that | |
812 | * would allow a much faster close, this is safer | |
813 | */ | |
814 | #if 0 | |
815 | cgc.cmd[1] = 1 << 1; | |
816 | #endif | |
817 | return pkt_generic_packet(pd, &cgc); | |
818 | } | |
819 | ||
820 | /* | |
821 | * speed is given as the normal factor, e.g. 4 for 4x | |
822 | */ | |
05680d86 PO |
823 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
824 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
825 | { |
826 | struct packet_command cgc; | |
827 | struct request_sense sense; | |
828 | int ret; | |
829 | ||
830 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
831 | cgc.sense = &sense; | |
832 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
833 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
834 | cgc.cmd[3] = read_speed & 0xff; | |
835 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
836 | cgc.cmd[5] = write_speed & 0xff; | |
837 | ||
838 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
839 | pkt_dump_sense(&cgc); | |
840 | ||
841 | return ret; | |
842 | } | |
843 | ||
844 | /* | |
845 | * Queue a bio for processing by the low-level CD device. Must be called | |
846 | * from process context. | |
847 | */ | |
46c271be | 848 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
849 | { |
850 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
851 | if (bio_data_dir(bio) == READ) |
852 | bio_list_add(&pd->iosched.read_queue, bio); | |
853 | else | |
854 | bio_list_add(&pd->iosched.write_queue, bio); | |
1da177e4 LT |
855 | spin_unlock(&pd->iosched.lock); |
856 | ||
857 | atomic_set(&pd->iosched.attention, 1); | |
858 | wake_up(&pd->wqueue); | |
859 | } | |
860 | ||
861 | /* | |
862 | * Process the queued read/write requests. This function handles special | |
863 | * requirements for CDRW drives: | |
864 | * - A cache flush command must be inserted before a read request if the | |
865 | * previous request was a write. | |
46c271be | 866 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 867 | * than necessary. |
46c271be PO |
868 | * - Optimize for throughput at the expense of latency. This means that streaming |
869 | * writes will never be interrupted by a read, but if the drive has to seek | |
870 | * before the next write, switch to reading instead if there are any pending | |
871 | * read requests. | |
1da177e4 LT |
872 | * - Set the read speed according to current usage pattern. When only reading |
873 | * from the device, it's best to use the highest possible read speed, but | |
874 | * when switching often between reading and writing, it's better to have the | |
875 | * same read and write speeds. | |
1da177e4 LT |
876 | */ |
877 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
878 | { | |
1da177e4 LT |
879 | |
880 | if (atomic_read(&pd->iosched.attention) == 0) | |
881 | return; | |
882 | atomic_set(&pd->iosched.attention, 0); | |
883 | ||
1da177e4 LT |
884 | for (;;) { |
885 | struct bio *bio; | |
46c271be | 886 | int reads_queued, writes_queued; |
1da177e4 LT |
887 | |
888 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
889 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
890 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
1da177e4 LT |
891 | spin_unlock(&pd->iosched.lock); |
892 | ||
893 | if (!reads_queued && !writes_queued) | |
894 | break; | |
895 | ||
896 | if (pd->iosched.writing) { | |
46c271be PO |
897 | int need_write_seek = 1; |
898 | spin_lock(&pd->iosched.lock); | |
c5ecc484 | 899 | bio = bio_list_peek(&pd->iosched.write_queue); |
46c271be PO |
900 | spin_unlock(&pd->iosched.lock); |
901 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
902 | need_write_seek = 0; | |
903 | if (need_write_seek && reads_queued) { | |
1da177e4 | 904 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
7822082d | 905 | VPRINTK(DRIVER_NAME": write, waiting\n"); |
1da177e4 LT |
906 | break; |
907 | } | |
908 | pkt_flush_cache(pd); | |
909 | pd->iosched.writing = 0; | |
910 | } | |
911 | } else { | |
912 | if (!reads_queued && writes_queued) { | |
913 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
7822082d | 914 | VPRINTK(DRIVER_NAME": read, waiting\n"); |
1da177e4 LT |
915 | break; |
916 | } | |
917 | pd->iosched.writing = 1; | |
918 | } | |
919 | } | |
920 | ||
921 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
922 | if (pd->iosched.writing) |
923 | bio = bio_list_pop(&pd->iosched.write_queue); | |
924 | else | |
925 | bio = bio_list_pop(&pd->iosched.read_queue); | |
1da177e4 LT |
926 | spin_unlock(&pd->iosched.lock); |
927 | ||
928 | if (!bio) | |
929 | continue; | |
930 | ||
931 | if (bio_data_dir(bio) == READ) | |
932 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
46c271be | 933 | else { |
1da177e4 | 934 | pd->iosched.successive_reads = 0; |
46c271be PO |
935 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
936 | } | |
1da177e4 LT |
937 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
938 | if (pd->read_speed == pd->write_speed) { | |
939 | pd->read_speed = MAX_SPEED; | |
940 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
941 | } | |
942 | } else { | |
943 | if (pd->read_speed != pd->write_speed) { | |
944 | pd->read_speed = pd->write_speed; | |
945 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
946 | } | |
947 | } | |
948 | ||
949 | atomic_inc(&pd->cdrw.pending_bios); | |
950 | generic_make_request(bio); | |
951 | } | |
952 | } | |
953 | ||
954 | /* | |
955 | * Special care is needed if the underlying block device has a small | |
956 | * max_phys_segments value. | |
957 | */ | |
165125e1 | 958 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 | 959 | { |
ae03bf63 | 960 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
8a78362c | 961 | <= queue_max_segments(q)) { |
1da177e4 LT |
962 | /* |
963 | * The cdrom device can handle one segment/frame | |
964 | */ | |
965 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
966 | return 0; | |
ae03bf63 | 967 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
8a78362c | 968 | <= queue_max_segments(q)) { |
1da177e4 LT |
969 | /* |
970 | * We can handle this case at the expense of some extra memory | |
971 | * copies during write operations | |
972 | */ | |
973 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
974 | return 0; | |
975 | } else { | |
7822082d | 976 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); |
1da177e4 LT |
977 | return -EIO; |
978 | } | |
979 | } | |
980 | ||
981 | /* | |
982 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page | |
983 | */ | |
984 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) | |
985 | { | |
986 | unsigned int copy_size = CD_FRAMESIZE; | |
987 | ||
988 | while (copy_size > 0) { | |
989 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); | |
990 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + | |
991 | src_bvl->bv_offset + offs; | |
992 | void *vto = page_address(dst_page) + dst_offs; | |
993 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); | |
994 | ||
995 | BUG_ON(len < 0); | |
996 | memcpy(vto, vfrom, len); | |
997 | kunmap_atomic(vfrom, KM_USER0); | |
998 | ||
999 | seg++; | |
1000 | offs = 0; | |
1001 | dst_offs += len; | |
1002 | copy_size -= len; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Copy all data for this packet to pkt->pages[], so that | |
1008 | * a) The number of required segments for the write bio is minimized, which | |
1009 | * is necessary for some scsi controllers. | |
1010 | * b) The data can be used as cache to avoid read requests if we receive a | |
1011 | * new write request for the same zone. | |
1012 | */ | |
72772323 | 1013 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
1014 | { |
1015 | int f, p, offs; | |
1016 | ||
1017 | /* Copy all data to pkt->pages[] */ | |
1018 | p = 0; | |
1019 | offs = 0; | |
1020 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1021 | if (bvec[f].bv_page != pkt->pages[p]) { |
1022 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; | |
1da177e4 LT |
1023 | void *vto = page_address(pkt->pages[p]) + offs; |
1024 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
1025 | kunmap_atomic(vfrom, KM_USER0); | |
72772323 PO |
1026 | bvec[f].bv_page = pkt->pages[p]; |
1027 | bvec[f].bv_offset = offs; | |
1da177e4 | 1028 | } else { |
72772323 | 1029 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
1030 | } |
1031 | offs += CD_FRAMESIZE; | |
1032 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
1033 | offs = 0; |
1034 | p++; | |
1035 | } | |
1036 | } | |
1037 | } | |
1038 | ||
6712ecf8 | 1039 | static void pkt_end_io_read(struct bio *bio, int err) |
1da177e4 LT |
1040 | { |
1041 | struct packet_data *pkt = bio->bi_private; | |
1042 | struct pktcdvd_device *pd = pkt->pd; | |
1043 | BUG_ON(!pd); | |
1044 | ||
1da177e4 LT |
1045 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, |
1046 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); | |
1047 | ||
1048 | if (err) | |
1049 | atomic_inc(&pkt->io_errors); | |
1050 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
1051 | atomic_inc(&pkt->run_sm); | |
1052 | wake_up(&pd->wqueue); | |
1053 | } | |
1054 | pkt_bio_finished(pd); | |
1da177e4 LT |
1055 | } |
1056 | ||
6712ecf8 | 1057 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
1da177e4 LT |
1058 | { |
1059 | struct packet_data *pkt = bio->bi_private; | |
1060 | struct pktcdvd_device *pd = pkt->pd; | |
1061 | BUG_ON(!pd); | |
1062 | ||
1da177e4 LT |
1063 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); |
1064 | ||
1065 | pd->stats.pkt_ended++; | |
1066 | ||
1067 | pkt_bio_finished(pd); | |
1068 | atomic_dec(&pkt->io_wait); | |
1069 | atomic_inc(&pkt->run_sm); | |
1070 | wake_up(&pd->wqueue); | |
1da177e4 LT |
1071 | } |
1072 | ||
1073 | /* | |
1074 | * Schedule reads for the holes in a packet | |
1075 | */ | |
1076 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1077 | { | |
1078 | int frames_read = 0; | |
1079 | struct bio *bio; | |
1080 | int f; | |
1081 | char written[PACKET_MAX_SIZE]; | |
1082 | ||
c5ecc484 | 1083 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1da177e4 LT |
1084 | |
1085 | atomic_set(&pkt->io_wait, 0); | |
1086 | atomic_set(&pkt->io_errors, 0); | |
1087 | ||
1da177e4 LT |
1088 | /* |
1089 | * Figure out which frames we need to read before we can write. | |
1090 | */ | |
1091 | memset(written, 0, sizeof(written)); | |
1092 | spin_lock(&pkt->lock); | |
c5ecc484 | 1093 | bio_list_for_each(bio, &pkt->orig_bios) { |
1da177e4 LT |
1094 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
1095 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1096 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1097 | BUG_ON(first_frame < 0); |
1098 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1099 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1100 | written[f] = 1; | |
1101 | } | |
1102 | spin_unlock(&pkt->lock); | |
1103 | ||
06e7ab53 PO |
1104 | if (pkt->cache_valid) { |
1105 | VPRINTK("pkt_gather_data: zone %llx cached\n", | |
1106 | (unsigned long long)pkt->sector); | |
1107 | goto out_account; | |
1108 | } | |
1109 | ||
1da177e4 LT |
1110 | /* |
1111 | * Schedule reads for missing parts of the packet. | |
1112 | */ | |
1113 | for (f = 0; f < pkt->frames; f++) { | |
761a15e7 JA |
1114 | struct bio_vec *vec; |
1115 | ||
1da177e4 LT |
1116 | int p, offset; |
1117 | if (written[f]) | |
1118 | continue; | |
1119 | bio = pkt->r_bios[f]; | |
761a15e7 | 1120 | vec = bio->bi_io_vec; |
1da177e4 LT |
1121 | bio_init(bio); |
1122 | bio->bi_max_vecs = 1; | |
1123 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
1124 | bio->bi_bdev = pd->bdev; | |
1125 | bio->bi_end_io = pkt_end_io_read; | |
1126 | bio->bi_private = pkt; | |
761a15e7 | 1127 | bio->bi_io_vec = vec; |
7e3da6c4 | 1128 | bio->bi_destructor = pkt_bio_destructor; |
1da177e4 LT |
1129 | |
1130 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1131 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1132 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", | |
1133 | f, pkt->pages[p], offset); | |
1134 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1135 | BUG(); | |
1136 | ||
1137 | atomic_inc(&pkt->io_wait); | |
1138 | bio->bi_rw = READ; | |
46c271be | 1139 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1140 | frames_read++; |
1141 | } | |
1142 | ||
1143 | out_account: | |
1144 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", | |
1145 | frames_read, (unsigned long long)pkt->sector); | |
1146 | pd->stats.pkt_started++; | |
1147 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | /* | |
1151 | * Find a packet matching zone, or the least recently used packet if | |
1152 | * there is no match. | |
1153 | */ | |
1154 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1155 | { | |
1156 | struct packet_data *pkt; | |
1157 | ||
1158 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1159 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1160 | list_del_init(&pkt->list); | |
1161 | if (pkt->sector != zone) | |
1162 | pkt->cache_valid = 0; | |
610827de | 1163 | return pkt; |
1da177e4 LT |
1164 | } |
1165 | } | |
610827de PO |
1166 | BUG(); |
1167 | return NULL; | |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1171 | { | |
1172 | if (pkt->cache_valid) { | |
1173 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1174 | } else { | |
1175 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * recover a failed write, query for relocation if possible | |
1181 | * | |
1182 | * returns 1 if recovery is possible, or 0 if not | |
1183 | * | |
1184 | */ | |
1185 | static int pkt_start_recovery(struct packet_data *pkt) | |
1186 | { | |
1187 | /* | |
1188 | * FIXME. We need help from the file system to implement | |
1189 | * recovery handling. | |
1190 | */ | |
1191 | return 0; | |
1192 | #if 0 | |
1193 | struct request *rq = pkt->rq; | |
1194 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1195 | struct block_device *pkt_bdev; | |
1196 | struct super_block *sb = NULL; | |
1197 | unsigned long old_block, new_block; | |
1198 | sector_t new_sector; | |
1199 | ||
1200 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1201 | if (pkt_bdev) { | |
1202 | sb = get_super(pkt_bdev); | |
1203 | bdput(pkt_bdev); | |
1204 | } | |
1205 | ||
1206 | if (!sb) | |
1207 | return 0; | |
1208 | ||
1209 | if (!sb->s_op || !sb->s_op->relocate_blocks) | |
1210 | goto out; | |
1211 | ||
1212 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1213 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1214 | goto out; | |
1215 | ||
1216 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1217 | pkt->sector = new_sector; | |
1218 | ||
1219 | pkt->bio->bi_sector = new_sector; | |
1220 | pkt->bio->bi_next = NULL; | |
1221 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; | |
1222 | pkt->bio->bi_idx = 0; | |
1223 | ||
7b6d91da | 1224 | BUG_ON(pkt->bio->bi_rw != REQ_WRITE); |
1da177e4 LT |
1225 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); |
1226 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); | |
1227 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); | |
1228 | BUG_ON(pkt->bio->bi_private != pkt); | |
1229 | ||
1230 | drop_super(sb); | |
1231 | return 1; | |
1232 | ||
1233 | out: | |
1234 | drop_super(sb); | |
1235 | return 0; | |
1236 | #endif | |
1237 | } | |
1238 | ||
1239 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1240 | { | |
1241 | #if PACKET_DEBUG > 1 | |
1242 | static const char *state_name[] = { | |
1243 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1244 | }; | |
1245 | enum packet_data_state old_state = pkt->state; | |
1246 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, | |
1247 | state_name[old_state], state_name[state]); | |
1248 | #endif | |
1249 | pkt->state = state; | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Scan the work queue to see if we can start a new packet. | |
1254 | * returns non-zero if any work was done. | |
1255 | */ | |
1256 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1257 | { | |
1258 | struct packet_data *pkt, *p; | |
1259 | struct bio *bio = NULL; | |
1260 | sector_t zone = 0; /* Suppress gcc warning */ | |
1261 | struct pkt_rb_node *node, *first_node; | |
1262 | struct rb_node *n; | |
0a0fc960 | 1263 | int wakeup; |
1da177e4 LT |
1264 | |
1265 | VPRINTK("handle_queue\n"); | |
1266 | ||
1267 | atomic_set(&pd->scan_queue, 0); | |
1268 | ||
1269 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
1270 | VPRINTK("handle_queue: no pkt\n"); | |
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Try to find a zone we are not already working on. | |
1276 | */ | |
1277 | spin_lock(&pd->lock); | |
1278 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1279 | if (!first_node) { | |
1280 | n = rb_first(&pd->bio_queue); | |
1281 | if (n) | |
1282 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1283 | } | |
1284 | node = first_node; | |
1285 | while (node) { | |
1286 | bio = node->bio; | |
1287 | zone = ZONE(bio->bi_sector, pd); | |
1288 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
7baeb6a5 PO |
1289 | if (p->sector == zone) { |
1290 | bio = NULL; | |
1da177e4 | 1291 | goto try_next_bio; |
7baeb6a5 | 1292 | } |
1da177e4 LT |
1293 | } |
1294 | break; | |
1295 | try_next_bio: | |
1296 | node = pkt_rbtree_next(node); | |
1297 | if (!node) { | |
1298 | n = rb_first(&pd->bio_queue); | |
1299 | if (n) | |
1300 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1301 | } | |
1302 | if (node == first_node) | |
1303 | node = NULL; | |
1304 | } | |
1305 | spin_unlock(&pd->lock); | |
1306 | if (!bio) { | |
1307 | VPRINTK("handle_queue: no bio\n"); | |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1312 | |
1313 | pd->current_sector = zone + pd->settings.size; | |
1314 | pkt->sector = zone; | |
e1bc89bc | 1315 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1316 | pkt->write_size = 0; |
1317 | ||
1318 | /* | |
1319 | * Scan work queue for bios in the same zone and link them | |
1320 | * to this packet. | |
1321 | */ | |
1322 | spin_lock(&pd->lock); | |
1323 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); | |
1324 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { | |
1325 | bio = node->bio; | |
1326 | VPRINTK("pkt_handle_queue: found zone=%llx\n", | |
1327 | (unsigned long long)ZONE(bio->bi_sector, pd)); | |
1328 | if (ZONE(bio->bi_sector, pd) != zone) | |
1329 | break; | |
1330 | pkt_rbtree_erase(pd, node); | |
1331 | spin_lock(&pkt->lock); | |
c5ecc484 | 1332 | bio_list_add(&pkt->orig_bios, bio); |
1da177e4 LT |
1333 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
1334 | spin_unlock(&pkt->lock); | |
1335 | } | |
0a0fc960 TM |
1336 | /* check write congestion marks, and if bio_queue_size is |
1337 | below, wake up any waiters */ | |
1338 | wakeup = (pd->write_congestion_on > 0 | |
1339 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1340 | spin_unlock(&pd->lock); |
8aa7e847 JA |
1341 | if (wakeup) { |
1342 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, | |
1343 | BLK_RW_ASYNC); | |
1344 | } | |
1da177e4 LT |
1345 | |
1346 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1347 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1348 | atomic_set(&pkt->run_sm, 1); | |
1349 | ||
1350 | spin_lock(&pd->cdrw.active_list_lock); | |
1351 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1352 | spin_unlock(&pd->cdrw.active_list_lock); | |
1353 | ||
1354 | return 1; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Assemble a bio to write one packet and queue the bio for processing | |
1359 | * by the underlying block device. | |
1360 | */ | |
1361 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1362 | { | |
1363 | struct bio *bio; | |
1da177e4 LT |
1364 | int f; |
1365 | int frames_write; | |
72772323 | 1366 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 LT |
1367 | |
1368 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1369 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1370 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1da177e4 LT |
1371 | } |
1372 | ||
1373 | /* | |
72772323 | 1374 | * Fill-in bvec with data from orig_bios. |
1da177e4 LT |
1375 | */ |
1376 | frames_write = 0; | |
1377 | spin_lock(&pkt->lock); | |
c5ecc484 | 1378 | bio_list_for_each(bio, &pkt->orig_bios) { |
1da177e4 LT |
1379 | int segment = bio->bi_idx; |
1380 | int src_offs = 0; | |
1381 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1382 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1383 | BUG_ON(first_frame < 0); | |
1384 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1385 | for (f = first_frame; f < first_frame + num_frames; f++) { | |
1386 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); | |
1387 | ||
1388 | while (src_offs >= src_bvl->bv_len) { | |
1389 | src_offs -= src_bvl->bv_len; | |
1390 | segment++; | |
1391 | BUG_ON(segment >= bio->bi_vcnt); | |
1392 | src_bvl = bio_iovec_idx(bio, segment); | |
1393 | } | |
1394 | ||
1395 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { | |
72772323 PO |
1396 | bvec[f].bv_page = src_bvl->bv_page; |
1397 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; | |
1da177e4 LT |
1398 | } else { |
1399 | pkt_copy_bio_data(bio, segment, src_offs, | |
72772323 | 1400 | bvec[f].bv_page, bvec[f].bv_offset); |
1da177e4 LT |
1401 | } |
1402 | src_offs += CD_FRAMESIZE; | |
1403 | frames_write++; | |
1404 | } | |
1405 | } | |
1406 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); | |
1407 | spin_unlock(&pkt->lock); | |
1408 | ||
1409 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", | |
1410 | frames_write, (unsigned long long)pkt->sector); | |
1411 | BUG_ON(frames_write != pkt->write_size); | |
1412 | ||
1413 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1414 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1415 | pkt->cache_valid = 1; |
1416 | } else { | |
1417 | pkt->cache_valid = 0; | |
1418 | } | |
1419 | ||
1420 | /* Start the write request */ | |
1421 | bio_init(pkt->w_bio); | |
1422 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; | |
1423 | pkt->w_bio->bi_sector = pkt->sector; | |
1424 | pkt->w_bio->bi_bdev = pd->bdev; | |
1425 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1426 | pkt->w_bio->bi_private = pkt; | |
761a15e7 | 1427 | pkt->w_bio->bi_io_vec = bvec; |
7e3da6c4 | 1428 | pkt->w_bio->bi_destructor = pkt_bio_destructor; |
72772323 PO |
1429 | for (f = 0; f < pkt->frames; f++) |
1430 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) | |
1431 | BUG(); | |
7822082d | 1432 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1433 | |
1434 | atomic_set(&pkt->io_wait, 1); | |
1435 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1436 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1437 | } |
1438 | ||
1439 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1440 | { | |
c5ecc484 | 1441 | struct bio *bio; |
1da177e4 LT |
1442 | |
1443 | if (!uptodate) | |
1444 | pkt->cache_valid = 0; | |
1445 | ||
1446 | /* Finish all bios corresponding to this packet */ | |
c5ecc484 | 1447 | while ((bio = bio_list_pop(&pkt->orig_bios))) |
6712ecf8 | 1448 | bio_endio(bio, uptodate ? 0 : -EIO); |
1da177e4 LT |
1449 | } |
1450 | ||
1451 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1452 | { | |
1453 | int uptodate; | |
1454 | ||
1455 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); | |
1456 | ||
1457 | for (;;) { | |
1458 | switch (pkt->state) { | |
1459 | case PACKET_WAITING_STATE: | |
1460 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1461 | return; | |
1462 | ||
1463 | pkt->sleep_time = 0; | |
1464 | pkt_gather_data(pd, pkt); | |
1465 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1466 | break; | |
1467 | ||
1468 | case PACKET_READ_WAIT_STATE: | |
1469 | if (atomic_read(&pkt->io_wait) > 0) | |
1470 | return; | |
1471 | ||
1472 | if (atomic_read(&pkt->io_errors) > 0) { | |
1473 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1474 | } else { | |
1475 | pkt_start_write(pd, pkt); | |
1476 | } | |
1477 | break; | |
1478 | ||
1479 | case PACKET_WRITE_WAIT_STATE: | |
1480 | if (atomic_read(&pkt->io_wait) > 0) | |
1481 | return; | |
1482 | ||
1483 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1484 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1485 | } else { | |
1486 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1487 | } | |
1488 | break; | |
1489 | ||
1490 | case PACKET_RECOVERY_STATE: | |
1491 | if (pkt_start_recovery(pkt)) { | |
1492 | pkt_start_write(pd, pkt); | |
1493 | } else { | |
1494 | VPRINTK("No recovery possible\n"); | |
1495 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1496 | } | |
1497 | break; | |
1498 | ||
1499 | case PACKET_FINISHED_STATE: | |
1500 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1501 | pkt_finish_packet(pkt, uptodate); | |
1502 | return; | |
1503 | ||
1504 | default: | |
1505 | BUG(); | |
1506 | break; | |
1507 | } | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1512 | { | |
1513 | struct packet_data *pkt, *next; | |
1514 | ||
1515 | VPRINTK("pkt_handle_packets\n"); | |
1516 | ||
1517 | /* | |
1518 | * Run state machine for active packets | |
1519 | */ | |
1520 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1521 | if (atomic_read(&pkt->run_sm) > 0) { | |
1522 | atomic_set(&pkt->run_sm, 0); | |
1523 | pkt_run_state_machine(pd, pkt); | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | /* | |
1528 | * Move no longer active packets to the free list | |
1529 | */ | |
1530 | spin_lock(&pd->cdrw.active_list_lock); | |
1531 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1532 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1533 | list_del(&pkt->list); | |
1534 | pkt_put_packet_data(pd, pkt); | |
1535 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1536 | atomic_set(&pd->scan_queue, 1); | |
1537 | } | |
1538 | } | |
1539 | spin_unlock(&pd->cdrw.active_list_lock); | |
1540 | } | |
1541 | ||
1542 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1543 | { | |
1544 | struct packet_data *pkt; | |
1545 | int i; | |
1546 | ||
ae7642bb | 1547 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1548 | states[i] = 0; |
1549 | ||
1550 | spin_lock(&pd->cdrw.active_list_lock); | |
1551 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1552 | states[pkt->state]++; | |
1553 | } | |
1554 | spin_unlock(&pd->cdrw.active_list_lock); | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * kcdrwd is woken up when writes have been queued for one of our | |
1559 | * registered devices | |
1560 | */ | |
1561 | static int kcdrwd(void *foobar) | |
1562 | { | |
1563 | struct pktcdvd_device *pd = foobar; | |
1564 | struct packet_data *pkt; | |
1565 | long min_sleep_time, residue; | |
1566 | ||
1567 | set_user_nice(current, -20); | |
83144186 | 1568 | set_freezable(); |
1da177e4 LT |
1569 | |
1570 | for (;;) { | |
1571 | DECLARE_WAITQUEUE(wait, current); | |
1572 | ||
1573 | /* | |
1574 | * Wait until there is something to do | |
1575 | */ | |
1576 | add_wait_queue(&pd->wqueue, &wait); | |
1577 | for (;;) { | |
1578 | set_current_state(TASK_INTERRUPTIBLE); | |
1579 | ||
1580 | /* Check if we need to run pkt_handle_queue */ | |
1581 | if (atomic_read(&pd->scan_queue) > 0) | |
1582 | goto work_to_do; | |
1583 | ||
1584 | /* Check if we need to run the state machine for some packet */ | |
1585 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1586 | if (atomic_read(&pkt->run_sm) > 0) | |
1587 | goto work_to_do; | |
1588 | } | |
1589 | ||
1590 | /* Check if we need to process the iosched queues */ | |
1591 | if (atomic_read(&pd->iosched.attention) != 0) | |
1592 | goto work_to_do; | |
1593 | ||
1594 | /* Otherwise, go to sleep */ | |
1595 | if (PACKET_DEBUG > 1) { | |
1596 | int states[PACKET_NUM_STATES]; | |
1597 | pkt_count_states(pd, states); | |
1598 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1599 | states[0], states[1], states[2], states[3], | |
1600 | states[4], states[5]); | |
1601 | } | |
1602 | ||
1603 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1604 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1605 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1606 | min_sleep_time = pkt->sleep_time; | |
1607 | } | |
1608 | ||
1da177e4 LT |
1609 | VPRINTK("kcdrwd: sleeping\n"); |
1610 | residue = schedule_timeout(min_sleep_time); | |
1611 | VPRINTK("kcdrwd: wake up\n"); | |
1612 | ||
1613 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1614 | try_to_freeze(); |
1da177e4 LT |
1615 | |
1616 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1617 | if (!pkt->sleep_time) | |
1618 | continue; | |
1619 | pkt->sleep_time -= min_sleep_time - residue; | |
1620 | if (pkt->sleep_time <= 0) { | |
1621 | pkt->sleep_time = 0; | |
1622 | atomic_inc(&pkt->run_sm); | |
1623 | } | |
1624 | } | |
1625 | ||
1da177e4 LT |
1626 | if (kthread_should_stop()) |
1627 | break; | |
1628 | } | |
1629 | work_to_do: | |
1630 | set_current_state(TASK_RUNNING); | |
1631 | remove_wait_queue(&pd->wqueue, &wait); | |
1632 | ||
1633 | if (kthread_should_stop()) | |
1634 | break; | |
1635 | ||
1636 | /* | |
1637 | * if pkt_handle_queue returns true, we can queue | |
1638 | * another request. | |
1639 | */ | |
1640 | while (pkt_handle_queue(pd)) | |
1641 | ; | |
1642 | ||
1643 | /* | |
1644 | * Handle packet state machine | |
1645 | */ | |
1646 | pkt_handle_packets(pd); | |
1647 | ||
1648 | /* | |
1649 | * Handle iosched queues | |
1650 | */ | |
1651 | pkt_iosched_process_queue(pd); | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1658 | { | |
7822082d | 1659 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
1da177e4 LT |
1660 | printk("%u blocks, ", pd->settings.size >> 2); |
1661 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); | |
1662 | } | |
1663 | ||
1664 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1665 | { | |
1666 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1667 | ||
1668 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1669 | cgc->cmd[2] = page_code | (page_control << 6); | |
1670 | cgc->cmd[7] = cgc->buflen >> 8; | |
1671 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1672 | cgc->data_direction = CGC_DATA_READ; | |
1673 | return pkt_generic_packet(pd, cgc); | |
1674 | } | |
1675 | ||
1676 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1677 | { | |
1678 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1679 | memset(cgc->buffer, 0, 2); | |
1680 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1681 | cgc->cmd[1] = 0x10; /* PF */ | |
1682 | cgc->cmd[7] = cgc->buflen >> 8; | |
1683 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1684 | cgc->data_direction = CGC_DATA_WRITE; | |
1685 | return pkt_generic_packet(pd, cgc); | |
1686 | } | |
1687 | ||
1688 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1689 | { | |
1690 | struct packet_command cgc; | |
1691 | int ret; | |
1692 | ||
1693 | /* set up command and get the disc info */ | |
1694 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1695 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1696 | cgc.cmd[8] = cgc.buflen = 2; | |
1697 | cgc.quiet = 1; | |
1698 | ||
1699 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1700 | return ret; | |
1701 | ||
1702 | /* not all drives have the same disc_info length, so requeue | |
1703 | * packet with the length the drive tells us it can supply | |
1704 | */ | |
1705 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1706 | sizeof(di->disc_information_length); | |
1707 | ||
1708 | if (cgc.buflen > sizeof(disc_information)) | |
1709 | cgc.buflen = sizeof(disc_information); | |
1710 | ||
1711 | cgc.cmd[8] = cgc.buflen; | |
1712 | return pkt_generic_packet(pd, &cgc); | |
1713 | } | |
1714 | ||
1715 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1716 | { | |
1717 | struct packet_command cgc; | |
1718 | int ret; | |
1719 | ||
1720 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1721 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1722 | cgc.cmd[1] = type & 3; | |
1723 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1724 | cgc.cmd[5] = track & 0xff; | |
1725 | cgc.cmd[8] = 8; | |
1726 | cgc.quiet = 1; | |
1727 | ||
1728 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1729 | return ret; | |
1730 | ||
1731 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1732 | sizeof(ti->track_information_length); | |
1733 | ||
1734 | if (cgc.buflen > sizeof(track_information)) | |
1735 | cgc.buflen = sizeof(track_information); | |
1736 | ||
1737 | cgc.cmd[8] = cgc.buflen; | |
1738 | return pkt_generic_packet(pd, &cgc); | |
1739 | } | |
1740 | ||
05680d86 PO |
1741 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1742 | long *last_written) | |
1da177e4 LT |
1743 | { |
1744 | disc_information di; | |
1745 | track_information ti; | |
1746 | __u32 last_track; | |
1747 | int ret = -1; | |
1748 | ||
1749 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1750 | return ret; | |
1751 | ||
1752 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1753 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1754 | return ret; | |
1755 | ||
1756 | /* if this track is blank, try the previous. */ | |
1757 | if (ti.blank) { | |
1758 | last_track--; | |
1759 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1760 | return ret; | |
1761 | } | |
1762 | ||
1763 | /* if last recorded field is valid, return it. */ | |
1764 | if (ti.lra_v) { | |
1765 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1766 | } else { | |
1767 | /* make it up instead */ | |
1768 | *last_written = be32_to_cpu(ti.track_start) + | |
1769 | be32_to_cpu(ti.track_size); | |
1770 | if (ti.free_blocks) | |
1771 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1772 | } | |
1773 | return 0; | |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * write mode select package based on pd->settings | |
1778 | */ | |
05680d86 | 1779 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1780 | { |
1781 | struct packet_command cgc; | |
1782 | struct request_sense sense; | |
1783 | write_param_page *wp; | |
1784 | char buffer[128]; | |
1785 | int ret, size; | |
1786 | ||
1787 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1788 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1789 | return 0; | |
1790 | ||
1791 | memset(buffer, 0, sizeof(buffer)); | |
1792 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1793 | cgc.sense = &sense; | |
1794 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1795 | pkt_dump_sense(&cgc); | |
1796 | return ret; | |
1797 | } | |
1798 | ||
1799 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1800 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1801 | if (size > sizeof(buffer)) | |
1802 | size = sizeof(buffer); | |
1803 | ||
1804 | /* | |
1805 | * now get it all | |
1806 | */ | |
1807 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1808 | cgc.sense = &sense; | |
1809 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1810 | pkt_dump_sense(&cgc); | |
1811 | return ret; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * write page is offset header + block descriptor length | |
1816 | */ | |
1817 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1818 | ||
1819 | wp->fp = pd->settings.fp; | |
1820 | wp->track_mode = pd->settings.track_mode; | |
1821 | wp->write_type = pd->settings.write_type; | |
1822 | wp->data_block_type = pd->settings.block_mode; | |
1823 | ||
1824 | wp->multi_session = 0; | |
1825 | ||
1826 | #ifdef PACKET_USE_LS | |
1827 | wp->link_size = 7; | |
1828 | wp->ls_v = 1; | |
1829 | #endif | |
1830 | ||
1831 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1832 | wp->session_format = 0; | |
1833 | wp->subhdr2 = 0x20; | |
1834 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1835 | wp->session_format = 0x20; | |
1836 | wp->subhdr2 = 8; | |
1837 | #if 0 | |
1838 | wp->mcn[0] = 0x80; | |
1839 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1840 | #endif | |
1841 | } else { | |
1842 | /* | |
1843 | * paranoia | |
1844 | */ | |
7822082d | 1845 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1846 | return 1; |
1847 | } | |
1848 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1849 | ||
1850 | cgc.buflen = cgc.cmd[8] = size; | |
1851 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1852 | pkt_dump_sense(&cgc); | |
1853 | return ret; | |
1854 | } | |
1855 | ||
1856 | pkt_print_settings(pd); | |
1857 | return 0; | |
1858 | } | |
1859 | ||
1860 | /* | |
7c613d59 | 1861 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1862 | */ |
ab863ec3 | 1863 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1864 | { |
ab863ec3 PO |
1865 | switch (pd->mmc3_profile) { |
1866 | case 0x1a: /* DVD+RW */ | |
1867 | case 0x12: /* DVD-RAM */ | |
1868 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1869 | return 1; | |
1870 | default: | |
1871 | break; | |
1872 | } | |
1da177e4 | 1873 | |
ab863ec3 PO |
1874 | if (!ti->packet || !ti->fp) |
1875 | return 0; | |
1da177e4 LT |
1876 | |
1877 | /* | |
1878 | * "good" settings as per Mt Fuji. | |
1879 | */ | |
ab863ec3 | 1880 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1881 | return 1; |
1da177e4 | 1882 | |
ab863ec3 | 1883 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1884 | return 1; |
1da177e4 | 1885 | |
ab863ec3 | 1886 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1887 | return 1; |
1da177e4 | 1888 | |
7822082d | 1889 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1890 | return 0; |
1da177e4 LT |
1891 | } |
1892 | ||
1893 | /* | |
7c613d59 | 1894 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1895 | */ |
7c613d59 | 1896 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1897 | { |
1898 | switch (pd->mmc3_profile) { | |
1899 | case 0x0a: /* CD-RW */ | |
1900 | case 0xffff: /* MMC3 not supported */ | |
1901 | break; | |
1902 | case 0x1a: /* DVD+RW */ | |
1903 | case 0x13: /* DVD-RW */ | |
1904 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1905 | return 1; |
1da177e4 | 1906 | default: |
7822082d | 1907 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); |
7c613d59 | 1908 | return 0; |
1da177e4 LT |
1909 | } |
1910 | ||
1911 | /* | |
1912 | * for disc type 0xff we should probably reserve a new track. | |
1913 | * but i'm not sure, should we leave this to user apps? probably. | |
1914 | */ | |
1915 | if (di->disc_type == 0xff) { | |
7822082d | 1916 | printk(DRIVER_NAME": Unknown disc. No track?\n"); |
7c613d59 | 1917 | return 0; |
1da177e4 LT |
1918 | } |
1919 | ||
1920 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
7822082d | 1921 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1922 | return 0; |
1da177e4 LT |
1923 | } |
1924 | ||
1925 | if (di->erasable == 0) { | |
7822082d | 1926 | printk(DRIVER_NAME": Disc not erasable\n"); |
7c613d59 | 1927 | return 0; |
1da177e4 LT |
1928 | } |
1929 | ||
1930 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
7822082d | 1931 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); |
7c613d59 | 1932 | return 0; |
1da177e4 LT |
1933 | } |
1934 | ||
7c613d59 | 1935 | return 1; |
1da177e4 LT |
1936 | } |
1937 | ||
05680d86 | 1938 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1939 | { |
1940 | struct packet_command cgc; | |
1941 | unsigned char buf[12]; | |
1942 | disc_information di; | |
1943 | track_information ti; | |
1944 | int ret, track; | |
1945 | ||
1946 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1947 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1948 | cgc.cmd[8] = 8; | |
1949 | ret = pkt_generic_packet(pd, &cgc); | |
1950 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1951 | ||
1952 | memset(&di, 0, sizeof(disc_information)); | |
1953 | memset(&ti, 0, sizeof(track_information)); | |
1954 | ||
1955 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
1956 | printk("failed get_disc\n"); | |
1957 | return ret; | |
1958 | } | |
1959 | ||
7c613d59 | 1960 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1961 | return -EROFS; |
1da177e4 | 1962 | |
1da177e4 LT |
1963 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1964 | ||
1965 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1966 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
7822082d | 1967 | printk(DRIVER_NAME": failed get_track\n"); |
1da177e4 LT |
1968 | return ret; |
1969 | } | |
1970 | ||
ab863ec3 | 1971 | if (!pkt_writable_track(pd, &ti)) { |
7822082d | 1972 | printk(DRIVER_NAME": can't write to this track\n"); |
9db91546 | 1973 | return -EROFS; |
1da177e4 LT |
1974 | } |
1975 | ||
1976 | /* | |
1977 | * we keep packet size in 512 byte units, makes it easier to | |
1978 | * deal with request calculations. | |
1979 | */ | |
1980 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1981 | if (pd->settings.size == 0) { | |
7822082d | 1982 | printk(DRIVER_NAME": detected zero packet size!\n"); |
a460ad62 | 1983 | return -ENXIO; |
1da177e4 | 1984 | } |
d0272e78 | 1985 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
7822082d | 1986 | printk(DRIVER_NAME": packet size is too big\n"); |
9db91546 | 1987 | return -EROFS; |
d0272e78 | 1988 | } |
1da177e4 LT |
1989 | pd->settings.fp = ti.fp; |
1990 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1991 | ||
1992 | if (ti.nwa_v) { | |
1993 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1994 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1995 | } | |
1996 | ||
1997 | /* | |
1998 | * in theory we could use lra on -RW media as well and just zero | |
1999 | * blocks that haven't been written yet, but in practice that | |
2000 | * is just a no-go. we'll use that for -R, naturally. | |
2001 | */ | |
2002 | if (ti.lra_v) { | |
2003 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
2004 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2005 | } else { | |
2006 | pd->lra = 0xffffffff; | |
2007 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * fine for now | |
2012 | */ | |
2013 | pd->settings.link_loss = 7; | |
2014 | pd->settings.write_type = 0; /* packet */ | |
2015 | pd->settings.track_mode = ti.track_mode; | |
2016 | ||
2017 | /* | |
2018 | * mode1 or mode2 disc | |
2019 | */ | |
2020 | switch (ti.data_mode) { | |
2021 | case PACKET_MODE1: | |
2022 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
2023 | break; | |
2024 | case PACKET_MODE2: | |
2025 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
2026 | break; | |
2027 | default: | |
7822082d | 2028 | printk(DRIVER_NAME": unknown data mode\n"); |
9db91546 | 2029 | return -EROFS; |
1da177e4 LT |
2030 | } |
2031 | return 0; | |
2032 | } | |
2033 | ||
2034 | /* | |
2035 | * enable/disable write caching on drive | |
2036 | */ | |
05680d86 PO |
2037 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
2038 | int set) | |
1da177e4 LT |
2039 | { |
2040 | struct packet_command cgc; | |
2041 | struct request_sense sense; | |
2042 | unsigned char buf[64]; | |
2043 | int ret; | |
2044 | ||
1da177e4 LT |
2045 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
2046 | cgc.sense = &sense; | |
2047 | cgc.buflen = pd->mode_offset + 12; | |
2048 | ||
2049 | /* | |
2050 | * caching mode page might not be there, so quiet this command | |
2051 | */ | |
2052 | cgc.quiet = 1; | |
2053 | ||
2054 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
2055 | return ret; | |
2056 | ||
2057 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
2058 | ||
2059 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
2060 | ret = pkt_mode_select(pd, &cgc); | |
2061 | if (ret) { | |
7822082d | 2062 | printk(DRIVER_NAME": write caching control failed\n"); |
1da177e4 LT |
2063 | pkt_dump_sense(&cgc); |
2064 | } else if (!ret && set) | |
7822082d | 2065 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); |
1da177e4 LT |
2066 | return ret; |
2067 | } | |
2068 | ||
2069 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
2070 | { | |
2071 | struct packet_command cgc; | |
2072 | ||
2073 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2074 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
2075 | cgc.cmd[4] = lockflag ? 1 : 0; | |
2076 | return pkt_generic_packet(pd, &cgc); | |
2077 | } | |
2078 | ||
2079 | /* | |
2080 | * Returns drive maximum write speed | |
2081 | */ | |
05680d86 PO |
2082 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
2083 | unsigned *write_speed) | |
1da177e4 LT |
2084 | { |
2085 | struct packet_command cgc; | |
2086 | struct request_sense sense; | |
2087 | unsigned char buf[256+18]; | |
2088 | unsigned char *cap_buf; | |
2089 | int ret, offset; | |
2090 | ||
1da177e4 LT |
2091 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
2092 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
2093 | cgc.sense = &sense; | |
2094 | ||
2095 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2096 | if (ret) { | |
2097 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
2098 | sizeof(struct mode_page_header); | |
2099 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2100 | if (ret) { | |
2101 | pkt_dump_sense(&cgc); | |
2102 | return ret; | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | offset = 20; /* Obsoleted field, used by older drives */ | |
2107 | if (cap_buf[1] >= 28) | |
2108 | offset = 28; /* Current write speed selected */ | |
2109 | if (cap_buf[1] >= 30) { | |
2110 | /* If the drive reports at least one "Logical Unit Write | |
2111 | * Speed Performance Descriptor Block", use the information | |
2112 | * in the first block. (contains the highest speed) | |
2113 | */ | |
2114 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2115 | if (num_spdb > 0) | |
2116 | offset = 34; | |
2117 | } | |
2118 | ||
2119 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | /* These tables from cdrecord - I don't have orange book */ | |
2124 | /* standard speed CD-RW (1-4x) */ | |
2125 | static char clv_to_speed[16] = { | |
2126 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2127 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2128 | }; | |
2129 | /* high speed CD-RW (-10x) */ | |
2130 | static char hs_clv_to_speed[16] = { | |
2131 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2132 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2133 | }; | |
2134 | /* ultra high speed CD-RW */ | |
2135 | static char us_clv_to_speed[16] = { | |
2136 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2137 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2138 | }; | |
2139 | ||
2140 | /* | |
2141 | * reads the maximum media speed from ATIP | |
2142 | */ | |
05680d86 PO |
2143 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2144 | unsigned *speed) | |
1da177e4 LT |
2145 | { |
2146 | struct packet_command cgc; | |
2147 | struct request_sense sense; | |
2148 | unsigned char buf[64]; | |
2149 | unsigned int size, st, sp; | |
2150 | int ret; | |
2151 | ||
2152 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2153 | cgc.sense = &sense; | |
2154 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2155 | cgc.cmd[1] = 2; | |
2156 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2157 | cgc.cmd[8] = 2; | |
2158 | ret = pkt_generic_packet(pd, &cgc); | |
2159 | if (ret) { | |
2160 | pkt_dump_sense(&cgc); | |
2161 | return ret; | |
2162 | } | |
2163 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2164 | if (size > sizeof(buf)) | |
2165 | size = sizeof(buf); | |
2166 | ||
2167 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2168 | cgc.sense = &sense; | |
2169 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2170 | cgc.cmd[1] = 2; | |
2171 | cgc.cmd[2] = 4; | |
2172 | cgc.cmd[8] = size; | |
2173 | ret = pkt_generic_packet(pd, &cgc); | |
2174 | if (ret) { | |
2175 | pkt_dump_sense(&cgc); | |
2176 | return ret; | |
2177 | } | |
2178 | ||
eaa0ff15 | 2179 | if (!(buf[6] & 0x40)) { |
7822082d | 2180 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); |
1da177e4 LT |
2181 | return 1; |
2182 | } | |
eaa0ff15 | 2183 | if (!(buf[6] & 0x4)) { |
7822082d | 2184 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2185 | return 1; |
2186 | } | |
2187 | ||
2188 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2189 | ||
2190 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2191 | ||
2192 | /* Info from cdrecord */ | |
2193 | switch (st) { | |
2194 | case 0: /* standard speed */ | |
2195 | *speed = clv_to_speed[sp]; | |
2196 | break; | |
2197 | case 1: /* high speed */ | |
2198 | *speed = hs_clv_to_speed[sp]; | |
2199 | break; | |
2200 | case 2: /* ultra high speed */ | |
2201 | *speed = us_clv_to_speed[sp]; | |
2202 | break; | |
2203 | default: | |
7822082d | 2204 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); |
1da177e4 LT |
2205 | return 1; |
2206 | } | |
2207 | if (*speed) { | |
7822082d | 2208 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); |
1da177e4 LT |
2209 | return 0; |
2210 | } else { | |
7822082d | 2211 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); |
1da177e4 LT |
2212 | return 1; |
2213 | } | |
2214 | } | |
2215 | ||
05680d86 | 2216 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2217 | { |
2218 | struct packet_command cgc; | |
2219 | struct request_sense sense; | |
2220 | int ret; | |
2221 | ||
7822082d | 2222 | VPRINTK(DRIVER_NAME": Performing OPC\n"); |
1da177e4 LT |
2223 | |
2224 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2225 | cgc.sense = &sense; | |
2226 | cgc.timeout = 60*HZ; | |
2227 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2228 | cgc.cmd[1] = 1; | |
2229 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
2230 | pkt_dump_sense(&cgc); | |
2231 | return ret; | |
2232 | } | |
2233 | ||
2234 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2235 | { | |
2236 | int ret; | |
2237 | unsigned int write_speed, media_write_speed, read_speed; | |
2238 | ||
2239 | if ((ret = pkt_probe_settings(pd))) { | |
7822082d | 2240 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); |
9db91546 | 2241 | return ret; |
1da177e4 LT |
2242 | } |
2243 | ||
2244 | if ((ret = pkt_set_write_settings(pd))) { | |
7822082d | 2245 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); |
1da177e4 LT |
2246 | return -EIO; |
2247 | } | |
2248 | ||
2249 | pkt_write_caching(pd, USE_WCACHING); | |
2250 | ||
2251 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2252 | write_speed = 16 * 177; | |
2253 | switch (pd->mmc3_profile) { | |
2254 | case 0x13: /* DVD-RW */ | |
2255 | case 0x1a: /* DVD+RW */ | |
2256 | case 0x12: /* DVD-RAM */ | |
7822082d | 2257 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2258 | break; |
2259 | default: | |
2260 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2261 | media_write_speed = 16; | |
2262 | write_speed = min(write_speed, media_write_speed * 177); | |
7822082d | 2263 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2264 | break; |
2265 | } | |
2266 | read_speed = write_speed; | |
2267 | ||
2268 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
7822082d | 2269 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); |
1da177e4 LT |
2270 | return -EIO; |
2271 | } | |
2272 | pd->write_speed = write_speed; | |
2273 | pd->read_speed = read_speed; | |
2274 | ||
2275 | if ((ret = pkt_perform_opc(pd))) { | |
7822082d | 2276 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); |
1da177e4 LT |
2277 | } |
2278 | ||
2279 | return 0; | |
2280 | } | |
2281 | ||
2282 | /* | |
2283 | * called at open time. | |
2284 | */ | |
aeb5d727 | 2285 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
1da177e4 LT |
2286 | { |
2287 | int ret; | |
2288 | long lba; | |
165125e1 | 2289 | struct request_queue *q; |
1da177e4 LT |
2290 | |
2291 | /* | |
2292 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2293 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2294 | * so bdget() can't fail. | |
2295 | */ | |
2296 | bdget(pd->bdev->bd_dev); | |
e525fd89 | 2297 | if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd))) |
1da177e4 LT |
2298 | goto out; |
2299 | ||
2300 | if ((ret = pkt_get_last_written(pd, &lba))) { | |
7822082d | 2301 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); |
e525fd89 | 2302 | goto out_putdev; |
1da177e4 LT |
2303 | } |
2304 | ||
2305 | set_capacity(pd->disk, lba << 2); | |
2306 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2307 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2308 | ||
2309 | q = bdev_get_queue(pd->bdev); | |
2310 | if (write) { | |
2311 | if ((ret = pkt_open_write(pd))) | |
e525fd89 | 2312 | goto out_putdev; |
1da177e4 LT |
2313 | /* |
2314 | * Some CDRW drives can not handle writes larger than one packet, | |
2315 | * even if the size is a multiple of the packet size. | |
2316 | */ | |
2317 | spin_lock_irq(q->queue_lock); | |
086fa5ff | 2318 | blk_queue_max_hw_sectors(q, pd->settings.size); |
1da177e4 LT |
2319 | spin_unlock_irq(q->queue_lock); |
2320 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2321 | } else { | |
2322 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2323 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2324 | } | |
2325 | ||
2326 | if ((ret = pkt_set_segment_merging(pd, q))) | |
e525fd89 | 2327 | goto out_putdev; |
1da177e4 | 2328 | |
e1bc89bc PO |
2329 | if (write) { |
2330 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
7822082d | 2331 | printk(DRIVER_NAME": not enough memory for buffers\n"); |
e1bc89bc | 2332 | ret = -ENOMEM; |
e525fd89 | 2333 | goto out_putdev; |
e1bc89bc | 2334 | } |
7822082d | 2335 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); |
e1bc89bc | 2336 | } |
1da177e4 LT |
2337 | |
2338 | return 0; | |
2339 | ||
2340 | out_putdev: | |
e525fd89 | 2341 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
1da177e4 LT |
2342 | out: |
2343 | return ret; | |
2344 | } | |
2345 | ||
2346 | /* | |
2347 | * called when the device is closed. makes sure that the device flushes | |
2348 | * the internal cache before we close. | |
2349 | */ | |
2350 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2351 | { | |
2352 | if (flush && pkt_flush_cache(pd)) | |
7822082d | 2353 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); |
1da177e4 LT |
2354 | |
2355 | pkt_lock_door(pd, 0); | |
2356 | ||
2357 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
e525fd89 | 2358 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
e1bc89bc PO |
2359 | |
2360 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2361 | } |
2362 | ||
252a52aa | 2363 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) |
1da177e4 LT |
2364 | { |
2365 | if (dev_minor >= MAX_WRITERS) | |
2366 | return NULL; | |
2367 | return pkt_devs[dev_minor]; | |
2368 | } | |
2369 | ||
5e5e007c | 2370 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
2371 | { |
2372 | struct pktcdvd_device *pd = NULL; | |
2373 | int ret; | |
2374 | ||
7822082d | 2375 | VPRINTK(DRIVER_NAME": entering open\n"); |
1da177e4 | 2376 | |
2a48fc0a | 2377 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2378 | mutex_lock(&ctl_mutex); |
5e5e007c | 2379 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
1da177e4 LT |
2380 | if (!pd) { |
2381 | ret = -ENODEV; | |
2382 | goto out; | |
2383 | } | |
2384 | BUG_ON(pd->refcnt < 0); | |
2385 | ||
2386 | pd->refcnt++; | |
46f4e1b7 | 2387 | if (pd->refcnt > 1) { |
5e5e007c | 2388 | if ((mode & FMODE_WRITE) && |
46f4e1b7 PO |
2389 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2390 | ret = -EBUSY; | |
2391 | goto out_dec; | |
2392 | } | |
2393 | } else { | |
5e5e007c | 2394 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
01fd9fda | 2395 | if (ret) |
1da177e4 | 2396 | goto out_dec; |
1da177e4 LT |
2397 | /* |
2398 | * needed here as well, since ext2 (among others) may change | |
2399 | * the blocksize at mount time | |
2400 | */ | |
5e5e007c | 2401 | set_blocksize(bdev, CD_FRAMESIZE); |
1da177e4 LT |
2402 | } |
2403 | ||
1657f824 | 2404 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2405 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2406 | return 0; |
2407 | ||
2408 | out_dec: | |
2409 | pd->refcnt--; | |
2410 | out: | |
7822082d | 2411 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); |
1657f824 | 2412 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2413 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2414 | return ret; |
2415 | } | |
2416 | ||
5e5e007c | 2417 | static int pkt_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2418 | { |
5e5e007c | 2419 | struct pktcdvd_device *pd = disk->private_data; |
1da177e4 LT |
2420 | int ret = 0; |
2421 | ||
2a48fc0a | 2422 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2423 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2424 | pd->refcnt--; |
2425 | BUG_ON(pd->refcnt < 0); | |
2426 | if (pd->refcnt == 0) { | |
2427 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2428 | pkt_release_dev(pd, flush); | |
2429 | } | |
1657f824 | 2430 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2431 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2432 | return ret; |
2433 | } | |
2434 | ||
2435 | ||
6712ecf8 | 2436 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
1da177e4 LT |
2437 | { |
2438 | struct packet_stacked_data *psd = bio->bi_private; | |
2439 | struct pktcdvd_device *pd = psd->pd; | |
2440 | ||
1da177e4 | 2441 | bio_put(bio); |
6712ecf8 | 2442 | bio_endio(psd->bio, err); |
1da177e4 LT |
2443 | mempool_free(psd, psd_pool); |
2444 | pkt_bio_finished(pd); | |
1da177e4 LT |
2445 | } |
2446 | ||
165125e1 | 2447 | static int pkt_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
2448 | { |
2449 | struct pktcdvd_device *pd; | |
2450 | char b[BDEVNAME_SIZE]; | |
2451 | sector_t zone; | |
2452 | struct packet_data *pkt; | |
2453 | int was_empty, blocked_bio; | |
2454 | struct pkt_rb_node *node; | |
2455 | ||
2456 | pd = q->queuedata; | |
2457 | if (!pd) { | |
7822082d | 2458 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
1da177e4 LT |
2459 | goto end_io; |
2460 | } | |
2461 | ||
2462 | /* | |
2463 | * Clone READ bios so we can have our own bi_end_io callback. | |
2464 | */ | |
2465 | if (bio_data_dir(bio) == READ) { | |
2466 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2467 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2468 | ||
2469 | psd->pd = pd; | |
2470 | psd->bio = bio; | |
2471 | cloned_bio->bi_bdev = pd->bdev; | |
2472 | cloned_bio->bi_private = psd; | |
2473 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2474 | pd->stats.secs_r += bio->bi_size >> 9; | |
46c271be | 2475 | pkt_queue_bio(pd, cloned_bio); |
1da177e4 LT |
2476 | return 0; |
2477 | } | |
2478 | ||
2479 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
7822082d | 2480 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", |
1da177e4 LT |
2481 | pd->name, (unsigned long long)bio->bi_sector); |
2482 | goto end_io; | |
2483 | } | |
2484 | ||
2485 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
7822082d | 2486 | printk(DRIVER_NAME": wrong bio size\n"); |
1da177e4 LT |
2487 | goto end_io; |
2488 | } | |
2489 | ||
2490 | blk_queue_bounce(q, &bio); | |
2491 | ||
2492 | zone = ZONE(bio->bi_sector, pd); | |
2493 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", | |
2494 | (unsigned long long)bio->bi_sector, | |
2495 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); | |
2496 | ||
2497 | /* Check if we have to split the bio */ | |
2498 | { | |
2499 | struct bio_pair *bp; | |
2500 | sector_t last_zone; | |
2501 | int first_sectors; | |
2502 | ||
2503 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); | |
2504 | if (last_zone != zone) { | |
2505 | BUG_ON(last_zone != zone + pd->settings.size); | |
2506 | first_sectors = last_zone - bio->bi_sector; | |
6feef531 | 2507 | bp = bio_split(bio, first_sectors); |
1da177e4 LT |
2508 | BUG_ON(!bp); |
2509 | pkt_make_request(q, &bp->bio1); | |
2510 | pkt_make_request(q, &bp->bio2); | |
2511 | bio_pair_release(bp); | |
2512 | return 0; | |
2513 | } | |
2514 | } | |
2515 | ||
2516 | /* | |
2517 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2518 | * just append this bio to that packet. | |
2519 | */ | |
2520 | spin_lock(&pd->cdrw.active_list_lock); | |
2521 | blocked_bio = 0; | |
2522 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2523 | if (pkt->sector == zone) { | |
2524 | spin_lock(&pkt->lock); | |
2525 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2526 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
c5ecc484 | 2527 | bio_list_add(&pkt->orig_bios, bio); |
1da177e4 LT |
2528 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
2529 | if ((pkt->write_size >= pkt->frames) && | |
2530 | (pkt->state == PACKET_WAITING_STATE)) { | |
2531 | atomic_inc(&pkt->run_sm); | |
2532 | wake_up(&pd->wqueue); | |
2533 | } | |
2534 | spin_unlock(&pkt->lock); | |
2535 | spin_unlock(&pd->cdrw.active_list_lock); | |
2536 | return 0; | |
2537 | } else { | |
2538 | blocked_bio = 1; | |
2539 | } | |
2540 | spin_unlock(&pkt->lock); | |
2541 | } | |
2542 | } | |
2543 | spin_unlock(&pd->cdrw.active_list_lock); | |
2544 | ||
0a0fc960 TM |
2545 | /* |
2546 | * Test if there is enough room left in the bio work queue | |
2547 | * (queue size >= congestion on mark). | |
2548 | * If not, wait till the work queue size is below the congestion off mark. | |
2549 | */ | |
2550 | spin_lock(&pd->lock); | |
2551 | if (pd->write_congestion_on > 0 | |
2552 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
8aa7e847 | 2553 | set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC); |
0a0fc960 TM |
2554 | do { |
2555 | spin_unlock(&pd->lock); | |
8aa7e847 | 2556 | congestion_wait(BLK_RW_ASYNC, HZ); |
0a0fc960 TM |
2557 | spin_lock(&pd->lock); |
2558 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2559 | } | |
2560 | spin_unlock(&pd->lock); | |
2561 | ||
1da177e4 LT |
2562 | /* |
2563 | * No matching packet found. Store the bio in the work queue. | |
2564 | */ | |
2565 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2566 | node->bio = bio; |
2567 | spin_lock(&pd->lock); | |
2568 | BUG_ON(pd->bio_queue_size < 0); | |
2569 | was_empty = (pd->bio_queue_size == 0); | |
2570 | pkt_rbtree_insert(pd, node); | |
2571 | spin_unlock(&pd->lock); | |
2572 | ||
2573 | /* | |
2574 | * Wake up the worker thread. | |
2575 | */ | |
2576 | atomic_set(&pd->scan_queue, 1); | |
2577 | if (was_empty) { | |
2578 | /* This wake_up is required for correct operation */ | |
2579 | wake_up(&pd->wqueue); | |
2580 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2581 | /* | |
2582 | * This wake up is not required for correct operation, | |
2583 | * but improves performance in some cases. | |
2584 | */ | |
2585 | wake_up(&pd->wqueue); | |
2586 | } | |
2587 | return 0; | |
2588 | end_io: | |
6712ecf8 | 2589 | bio_io_error(bio); |
1da177e4 LT |
2590 | return 0; |
2591 | } | |
2592 | ||
2593 | ||
2594 | ||
cc371e66 AK |
2595 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2596 | struct bio_vec *bvec) | |
1da177e4 LT |
2597 | { |
2598 | struct pktcdvd_device *pd = q->queuedata; | |
cc371e66 AK |
2599 | sector_t zone = ZONE(bmd->bi_sector, pd); |
2600 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; | |
1da177e4 LT |
2601 | int remaining = (pd->settings.size << 9) - used; |
2602 | int remaining2; | |
2603 | ||
2604 | /* | |
2605 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2606 | * boundary, pkt_make_request() will split the bio. | |
2607 | */ | |
cc371e66 | 2608 | remaining2 = PAGE_SIZE - bmd->bi_size; |
1da177e4 LT |
2609 | remaining = max(remaining, remaining2); |
2610 | ||
2611 | BUG_ON(remaining < 0); | |
2612 | return remaining; | |
2613 | } | |
2614 | ||
2615 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2616 | { | |
165125e1 | 2617 | struct request_queue *q = pd->disk->queue; |
1da177e4 LT |
2618 | |
2619 | blk_queue_make_request(q, pkt_make_request); | |
e1defc4f | 2620 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
086fa5ff | 2621 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
1da177e4 LT |
2622 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
2623 | q->queuedata = pd; | |
2624 | } | |
2625 | ||
2626 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2627 | { | |
2628 | struct pktcdvd_device *pd = m->private; | |
2629 | char *msg; | |
2630 | char bdev_buf[BDEVNAME_SIZE]; | |
2631 | int states[PACKET_NUM_STATES]; | |
2632 | ||
2633 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2634 | bdevname(pd->bdev, bdev_buf)); | |
2635 | ||
2636 | seq_printf(m, "\nSettings:\n"); | |
2637 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2638 | ||
2639 | if (pd->settings.write_type == 0) | |
2640 | msg = "Packet"; | |
2641 | else | |
2642 | msg = "Unknown"; | |
2643 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2644 | ||
2645 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2646 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2647 | ||
2648 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2649 | ||
2650 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2651 | msg = "Mode 1"; | |
2652 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2653 | msg = "Mode 2"; | |
2654 | else | |
2655 | msg = "Unknown"; | |
2656 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2657 | ||
2658 | seq_printf(m, "\nStatistics:\n"); | |
2659 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2660 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2661 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2662 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2663 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2664 | ||
2665 | seq_printf(m, "\nMisc:\n"); | |
2666 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2667 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2668 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2669 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2670 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2671 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2672 | ||
2673 | seq_printf(m, "\nQueue state:\n"); | |
2674 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2675 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2676 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2677 | ||
2678 | pkt_count_states(pd, states); | |
2679 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2680 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2681 | ||
0a0fc960 TM |
2682 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2683 | pd->write_congestion_off, | |
2684 | pd->write_congestion_on); | |
1da177e4 LT |
2685 | return 0; |
2686 | } | |
2687 | ||
2688 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2689 | { | |
2690 | return single_open(file, pkt_seq_show, PDE(inode)->data); | |
2691 | } | |
2692 | ||
2b8693c0 | 2693 | static const struct file_operations pkt_proc_fops = { |
1da177e4 LT |
2694 | .open = pkt_seq_open, |
2695 | .read = seq_read, | |
2696 | .llseek = seq_lseek, | |
2697 | .release = single_release | |
2698 | }; | |
2699 | ||
2700 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2701 | { | |
2702 | int i; | |
2703 | int ret = 0; | |
2704 | char b[BDEVNAME_SIZE]; | |
1da177e4 LT |
2705 | struct block_device *bdev; |
2706 | ||
2707 | if (pd->pkt_dev == dev) { | |
7822082d | 2708 | printk(DRIVER_NAME": Recursive setup not allowed\n"); |
1da177e4 LT |
2709 | return -EBUSY; |
2710 | } | |
2711 | for (i = 0; i < MAX_WRITERS; i++) { | |
2712 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2713 | if (!pd2) | |
2714 | continue; | |
2715 | if (pd2->bdev->bd_dev == dev) { | |
7822082d | 2716 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); |
1da177e4 LT |
2717 | return -EBUSY; |
2718 | } | |
2719 | if (pd2->pkt_dev == dev) { | |
7822082d | 2720 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); |
1da177e4 LT |
2721 | return -EBUSY; |
2722 | } | |
2723 | } | |
2724 | ||
2725 | bdev = bdget(dev); | |
2726 | if (!bdev) | |
2727 | return -ENOMEM; | |
e525fd89 | 2728 | ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); |
1da177e4 LT |
2729 | if (ret) |
2730 | return ret; | |
2731 | ||
2732 | /* This is safe, since we have a reference from open(). */ | |
2733 | __module_get(THIS_MODULE); | |
2734 | ||
1da177e4 LT |
2735 | pd->bdev = bdev; |
2736 | set_blocksize(bdev, CD_FRAMESIZE); | |
2737 | ||
2738 | pkt_init_queue(pd); | |
2739 | ||
2740 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2741 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2742 | if (IS_ERR(pd->cdrw.thread)) { | |
7822082d | 2743 | printk(DRIVER_NAME": can't start kernel thread\n"); |
1da177e4 | 2744 | ret = -ENOMEM; |
e1bc89bc | 2745 | goto out_mem; |
1da177e4 LT |
2746 | } |
2747 | ||
c7705f34 | 2748 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
7822082d | 2749 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
1da177e4 LT |
2750 | return 0; |
2751 | ||
1da177e4 | 2752 | out_mem: |
2cbed890 | 2753 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 LT |
2754 | /* This is safe: open() is still holding a reference. */ |
2755 | module_put(THIS_MODULE); | |
2756 | return ret; | |
2757 | } | |
2758 | ||
5e5e007c | 2759 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
1da177e4 | 2760 | { |
5e5e007c | 2761 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
8a6cfeb6 | 2762 | int ret; |
1da177e4 | 2763 | |
5e5e007c AV |
2764 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, |
2765 | MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); | |
1da177e4 | 2766 | |
2a48fc0a | 2767 | mutex_lock(&pktcdvd_mutex); |
1da177e4 | 2768 | switch (cmd) { |
a0eb62a0 AV |
2769 | case CDROMEJECT: |
2770 | /* | |
2771 | * The door gets locked when the device is opened, so we | |
2772 | * have to unlock it or else the eject command fails. | |
2773 | */ | |
2774 | if (pd->refcnt == 1) | |
2775 | pkt_lock_door(pd, 0); | |
2776 | /* fallthru */ | |
1da177e4 LT |
2777 | /* |
2778 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2779 | */ | |
2780 | case CDROMMULTISESSION: | |
2781 | case CDROMREADTOCENTRY: | |
2782 | case CDROM_LAST_WRITTEN: | |
2783 | case CDROM_SEND_PACKET: | |
2784 | case SCSI_IOCTL_SEND_COMMAND: | |
8a6cfeb6 AB |
2785 | ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg); |
2786 | break; | |
1da177e4 LT |
2787 | |
2788 | default: | |
7822082d | 2789 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); |
8a6cfeb6 | 2790 | ret = -ENOTTY; |
1da177e4 | 2791 | } |
2a48fc0a | 2792 | mutex_unlock(&pktcdvd_mutex); |
8560c650 | 2793 | |
8a6cfeb6 | 2794 | return ret; |
1da177e4 LT |
2795 | } |
2796 | ||
3c0d2060 TH |
2797 | static unsigned int pkt_check_events(struct gendisk *disk, |
2798 | unsigned int clearing) | |
1da177e4 LT |
2799 | { |
2800 | struct pktcdvd_device *pd = disk->private_data; | |
2801 | struct gendisk *attached_disk; | |
2802 | ||
2803 | if (!pd) | |
2804 | return 0; | |
2805 | if (!pd->bdev) | |
2806 | return 0; | |
2807 | attached_disk = pd->bdev->bd_disk; | |
3c0d2060 | 2808 | if (!attached_disk || !attached_disk->fops->check_events) |
1da177e4 | 2809 | return 0; |
3c0d2060 | 2810 | return attached_disk->fops->check_events(attached_disk, clearing); |
1da177e4 LT |
2811 | } |
2812 | ||
83d5cde4 | 2813 | static const struct block_device_operations pktcdvd_ops = { |
1da177e4 | 2814 | .owner = THIS_MODULE, |
5e5e007c AV |
2815 | .open = pkt_open, |
2816 | .release = pkt_close, | |
8a6cfeb6 | 2817 | .ioctl = pkt_ioctl, |
3c0d2060 | 2818 | .check_events = pkt_check_events, |
1da177e4 LT |
2819 | }; |
2820 | ||
e454cea2 | 2821 | static char *pktcdvd_devnode(struct gendisk *gd, mode_t *mode) |
b03f38b6 KS |
2822 | { |
2823 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); | |
2824 | } | |
2825 | ||
1da177e4 LT |
2826 | /* |
2827 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2828 | */ | |
adb9250a | 2829 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2830 | { |
2831 | int idx; | |
2832 | int ret = -ENOMEM; | |
2833 | struct pktcdvd_device *pd; | |
2834 | struct gendisk *disk; | |
adb9250a TM |
2835 | |
2836 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2837 | |
2838 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2839 | if (!pkt_devs[idx]) | |
2840 | break; | |
2841 | if (idx == MAX_WRITERS) { | |
7822082d | 2842 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2843 | ret = -EBUSY; |
2844 | goto out_mutex; | |
1da177e4 LT |
2845 | } |
2846 | ||
1107d2e0 | 2847 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2848 | if (!pd) |
adb9250a | 2849 | goto out_mutex; |
1da177e4 | 2850 | |
0eaae62a MD |
2851 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2852 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2853 | if (!pd->rb_pool) |
2854 | goto out_mem; | |
2855 | ||
e1bc89bc PO |
2856 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2857 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2858 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2859 | ||
1da177e4 LT |
2860 | spin_lock_init(&pd->lock); |
2861 | spin_lock_init(&pd->iosched.lock); | |
c5ecc484 AM |
2862 | bio_list_init(&pd->iosched.read_queue); |
2863 | bio_list_init(&pd->iosched.write_queue); | |
7822082d | 2864 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2865 | init_waitqueue_head(&pd->wqueue); |
2866 | pd->bio_queue = RB_ROOT; | |
2867 | ||
0a0fc960 TM |
2868 | pd->write_congestion_on = write_congestion_on; |
2869 | pd->write_congestion_off = write_congestion_off; | |
2870 | ||
adb9250a TM |
2871 | disk = alloc_disk(1); |
2872 | if (!disk) | |
2873 | goto out_mem; | |
2874 | pd->disk = disk; | |
add21660 | 2875 | disk->major = pktdev_major; |
1da177e4 LT |
2876 | disk->first_minor = idx; |
2877 | disk->fops = &pktcdvd_ops; | |
2878 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2879 | strcpy(disk->disk_name, pd->name); |
e454cea2 | 2880 | disk->devnode = pktcdvd_devnode; |
1da177e4 LT |
2881 | disk->private_data = pd; |
2882 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2883 | if (!disk->queue) | |
2884 | goto out_mem2; | |
2885 | ||
f331c029 | 2886 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2887 | ret = pkt_new_dev(pd, dev); |
2888 | if (ret) | |
2889 | goto out_new_dev; | |
2890 | ||
3c0d2060 TH |
2891 | /* inherit events of the host device */ |
2892 | disk->events = pd->bdev->bd_disk->events; | |
2893 | disk->async_events = pd->bdev->bd_disk->async_events; | |
2894 | ||
1da177e4 | 2895 | add_disk(disk); |
adb9250a | 2896 | |
32694850 TM |
2897 | pkt_sysfs_dev_new(pd); |
2898 | pkt_debugfs_dev_new(pd); | |
2899 | ||
1da177e4 | 2900 | pkt_devs[idx] = pd; |
adb9250a TM |
2901 | if (pkt_dev) |
2902 | *pkt_dev = pd->pkt_dev; | |
2903 | ||
2904 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2905 | return 0; |
2906 | ||
2907 | out_new_dev: | |
1312f40e | 2908 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2909 | out_mem2: |
2910 | put_disk(disk); | |
2911 | out_mem: | |
2912 | if (pd->rb_pool) | |
2913 | mempool_destroy(pd->rb_pool); | |
2914 | kfree(pd); | |
adb9250a TM |
2915 | out_mutex: |
2916 | mutex_unlock(&ctl_mutex); | |
2917 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); | |
1da177e4 LT |
2918 | return ret; |
2919 | } | |
2920 | ||
2921 | /* | |
2922 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2923 | */ | |
adb9250a | 2924 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2925 | { |
2926 | struct pktcdvd_device *pd; | |
2927 | int idx; | |
adb9250a TM |
2928 | int ret = 0; |
2929 | ||
2930 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2931 | |
2932 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2933 | pd = pkt_devs[idx]; | |
2934 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2935 | break; | |
2936 | } | |
2937 | if (idx == MAX_WRITERS) { | |
7822082d | 2938 | DPRINTK(DRIVER_NAME": dev not setup\n"); |
adb9250a TM |
2939 | ret = -ENXIO; |
2940 | goto out; | |
1da177e4 LT |
2941 | } |
2942 | ||
adb9250a TM |
2943 | if (pd->refcnt > 0) { |
2944 | ret = -EBUSY; | |
2945 | goto out; | |
2946 | } | |
1da177e4 LT |
2947 | if (!IS_ERR(pd->cdrw.thread)) |
2948 | kthread_stop(pd->cdrw.thread); | |
2949 | ||
32694850 TM |
2950 | pkt_devs[idx] = NULL; |
2951 | ||
2952 | pkt_debugfs_dev_remove(pd); | |
2953 | pkt_sysfs_dev_remove(pd); | |
2954 | ||
2cbed890 | 2955 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 | 2956 | |
1da177e4 | 2957 | remove_proc_entry(pd->name, pkt_proc); |
7822082d | 2958 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); |
1da177e4 LT |
2959 | |
2960 | del_gendisk(pd->disk); | |
1312f40e | 2961 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2962 | put_disk(pd->disk); |
2963 | ||
1da177e4 LT |
2964 | mempool_destroy(pd->rb_pool); |
2965 | kfree(pd); | |
2966 | ||
2967 | /* This is safe: open() is still holding a reference. */ | |
2968 | module_put(THIS_MODULE); | |
adb9250a TM |
2969 | |
2970 | out: | |
2971 | mutex_unlock(&ctl_mutex); | |
2972 | return ret; | |
1da177e4 LT |
2973 | } |
2974 | ||
2975 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2976 | { | |
adb9250a TM |
2977 | struct pktcdvd_device *pd; |
2978 | ||
2979 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2980 | ||
2981 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2982 | if (pd) { |
2983 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2984 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2985 | } else { | |
2986 | ctrl_cmd->dev = 0; | |
2987 | ctrl_cmd->pkt_dev = 0; | |
2988 | } | |
2989 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2990 | |
2991 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2992 | } |
2993 | ||
f80a0ca6 | 2994 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
2995 | { |
2996 | void __user *argp = (void __user *)arg; | |
2997 | struct pkt_ctrl_command ctrl_cmd; | |
2998 | int ret = 0; | |
adb9250a | 2999 | dev_t pkt_dev = 0; |
1da177e4 LT |
3000 | |
3001 | if (cmd != PACKET_CTRL_CMD) | |
3002 | return -ENOTTY; | |
3003 | ||
3004 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
3005 | return -EFAULT; | |
3006 | ||
3007 | switch (ctrl_cmd.command) { | |
3008 | case PKT_CTRL_CMD_SETUP: | |
3009 | if (!capable(CAP_SYS_ADMIN)) | |
3010 | return -EPERM; | |
adb9250a TM |
3011 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
3012 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
3013 | break; |
3014 | case PKT_CTRL_CMD_TEARDOWN: | |
3015 | if (!capable(CAP_SYS_ADMIN)) | |
3016 | return -EPERM; | |
adb9250a | 3017 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
3018 | break; |
3019 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 3020 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
3021 | break; |
3022 | default: | |
3023 | return -ENOTTY; | |
3024 | } | |
3025 | ||
3026 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
3027 | return -EFAULT; | |
3028 | return ret; | |
3029 | } | |
3030 | ||
f80a0ca6 AB |
3031 | #ifdef CONFIG_COMPAT |
3032 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
3033 | { | |
3034 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
3035 | } | |
3036 | #endif | |
1da177e4 | 3037 | |
2b8693c0 | 3038 | static const struct file_operations pkt_ctl_fops = { |
f80a0ca6 AB |
3039 | .open = nonseekable_open, |
3040 | .unlocked_ioctl = pkt_ctl_ioctl, | |
3041 | #ifdef CONFIG_COMPAT | |
3042 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
3043 | #endif | |
3044 | .owner = THIS_MODULE, | |
6038f373 | 3045 | .llseek = no_llseek, |
1da177e4 LT |
3046 | }; |
3047 | ||
3048 | static struct miscdevice pkt_misc = { | |
3049 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 3050 | .name = DRIVER_NAME, |
e454cea2 | 3051 | .nodename = "pktcdvd/control", |
1da177e4 LT |
3052 | .fops = &pkt_ctl_fops |
3053 | }; | |
3054 | ||
3055 | static int __init pkt_init(void) | |
3056 | { | |
3057 | int ret; | |
3058 | ||
32694850 TM |
3059 | mutex_init(&ctl_mutex); |
3060 | ||
0eaae62a MD |
3061 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
3062 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
3063 | if (!psd_pool) |
3064 | return -ENOMEM; | |
3065 | ||
add21660 | 3066 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 3067 | if (ret < 0) { |
7822082d | 3068 | printk(DRIVER_NAME": Unable to register block device\n"); |
1da177e4 LT |
3069 | goto out2; |
3070 | } | |
add21660 TM |
3071 | if (!pktdev_major) |
3072 | pktdev_major = ret; | |
1da177e4 | 3073 | |
32694850 TM |
3074 | ret = pkt_sysfs_init(); |
3075 | if (ret) | |
3076 | goto out; | |
3077 | ||
3078 | pkt_debugfs_init(); | |
3079 | ||
1da177e4 LT |
3080 | ret = misc_register(&pkt_misc); |
3081 | if (ret) { | |
7822082d | 3082 | printk(DRIVER_NAME": Unable to register misc device\n"); |
32694850 | 3083 | goto out_misc; |
1da177e4 LT |
3084 | } |
3085 | ||
928b4d8c | 3086 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3087 | |
1da177e4 LT |
3088 | return 0; |
3089 | ||
32694850 TM |
3090 | out_misc: |
3091 | pkt_debugfs_cleanup(); | |
3092 | pkt_sysfs_cleanup(); | |
1da177e4 | 3093 | out: |
add21660 | 3094 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3095 | out2: |
3096 | mempool_destroy(psd_pool); | |
3097 | return ret; | |
3098 | } | |
3099 | ||
3100 | static void __exit pkt_exit(void) | |
3101 | { | |
928b4d8c | 3102 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3103 | misc_deregister(&pkt_misc); |
32694850 TM |
3104 | |
3105 | pkt_debugfs_cleanup(); | |
3106 | pkt_sysfs_cleanup(); | |
3107 | ||
add21660 | 3108 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3109 | mempool_destroy(psd_pool); |
3110 | } | |
3111 | ||
3112 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3113 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3114 | MODULE_LICENSE("GPL"); | |
3115 | ||
3116 | module_init(pkt_init); | |
3117 | module_exit(pkt_exit); |