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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
adb9250a | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
1da177e4 LT |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
a676f8d0 PO |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. | |
1da177e4 LT |
11 | * |
12 | * Theory of operation: | |
13 | * | |
a676f8d0 PO |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
15 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, | |
16 | * but it doesn't know anything about the special restrictions that apply to | |
17 | * packet writing. One restriction is that write requests must be aligned to | |
18 | * packet boundaries on the physical media, and the size of a write request | |
19 | * must be equal to the packet size. Another restriction is that a | |
20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read | |
21 | * command, if the previous command was a write. | |
22 | * | |
23 | * The purpose of the packet writing driver is to hide these restrictions from | |
24 | * higher layers, such as file systems, and present a block device that can be | |
25 | * randomly read and written using 2kB-sized blocks. | |
26 | * | |
27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. | |
28 | * Its data is defined by the struct packet_iosched and includes two bio | |
29 | * queues with pending read and write requests. These queues are processed | |
30 | * by the pkt_iosched_process_queue() function. The write requests in this | |
31 | * queue are already properly aligned and sized. This layer is responsible for | |
32 | * issuing the flush cache commands and scheduling the I/O in a good order. | |
33 | * | |
34 | * The next layer transforms unaligned write requests to aligned writes. This | |
35 | * transformation requires reading missing pieces of data from the underlying | |
36 | * block device, assembling the pieces to full packets and queuing them to the | |
37 | * packet I/O scheduler. | |
38 | * | |
39 | * At the top layer there is a custom make_request_fn function that forwards | |
40 | * read requests directly to the iosched queue and puts write requests in the | |
41 | * unaligned write queue. A kernel thread performs the necessary read | |
42 | * gathering to convert the unaligned writes to aligned writes and then feeds | |
43 | * them to the packet I/O scheduler. | |
1da177e4 LT |
44 | * |
45 | *************************************************************************/ | |
46 | ||
1da177e4 | 47 | #include <linux/pktcdvd.h> |
1da177e4 LT |
48 | #include <linux/module.h> |
49 | #include <linux/types.h> | |
50 | #include <linux/kernel.h> | |
51 | #include <linux/kthread.h> | |
52 | #include <linux/errno.h> | |
53 | #include <linux/spinlock.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/proc_fs.h> | |
56 | #include <linux/seq_file.h> | |
57 | #include <linux/miscdevice.h> | |
7dfb7103 | 58 | #include <linux/freezer.h> |
1657f824 | 59 | #include <linux/mutex.h> |
1da177e4 LT |
60 | #include <scsi/scsi_cmnd.h> |
61 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 62 | #include <scsi/scsi.h> |
32694850 TM |
63 | #include <linux/debugfs.h> |
64 | #include <linux/device.h> | |
1da177e4 LT |
65 | |
66 | #include <asm/uaccess.h> | |
67 | ||
7822082d TM |
68 | #define DRIVER_NAME "pktcdvd" |
69 | ||
1da177e4 LT |
70 | #if PACKET_DEBUG |
71 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
72 | #else | |
73 | #define DPRINTK(fmt, args...) | |
74 | #endif | |
75 | ||
76 | #if PACKET_DEBUG > 1 | |
77 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
78 | #else | |
79 | #define VPRINTK(fmt, args...) | |
80 | #endif | |
81 | ||
82 | #define MAX_SPEED 0xffff | |
83 | ||
84 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) | |
85 | ||
86 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; | |
87 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 88 | static int pktdev_major; |
0a0fc960 TM |
89 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
90 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 91 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
92 | static mempool_t *psd_pool; |
93 | ||
32694850 TM |
94 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
95 | static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */ | |
96 | ||
97 | /* forward declaration */ | |
98 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
99 | static int pkt_remove_dev(dev_t pkt_dev); | |
100 | static int pkt_seq_show(struct seq_file *m, void *p); | |
101 | ||
102 | ||
103 | ||
104 | /* | |
105 | * create and register a pktcdvd kernel object. | |
106 | */ | |
107 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
108 | const char* name, | |
109 | struct kobject* parent, | |
110 | struct kobj_type* ktype) | |
111 | { | |
112 | struct pktcdvd_kobj *p; | |
113 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
114 | if (!p) | |
115 | return NULL; | |
116 | kobject_set_name(&p->kobj, "%s", name); | |
117 | p->kobj.parent = parent; | |
118 | p->kobj.ktype = ktype; | |
119 | p->pd = pd; | |
120 | if (kobject_register(&p->kobj) != 0) | |
121 | return NULL; | |
122 | return p; | |
123 | } | |
124 | /* | |
125 | * remove a pktcdvd kernel object. | |
126 | */ | |
127 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
128 | { | |
129 | if (p) | |
130 | kobject_unregister(&p->kobj); | |
131 | } | |
132 | /* | |
133 | * default release function for pktcdvd kernel objects. | |
134 | */ | |
135 | static void pkt_kobj_release(struct kobject *kobj) | |
136 | { | |
137 | kfree(to_pktcdvdkobj(kobj)); | |
138 | } | |
139 | ||
140 | ||
141 | /********************************************************** | |
142 | * | |
143 | * sysfs interface for pktcdvd | |
144 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
145 | * | |
146 | **********************************************************/ | |
147 | ||
148 | #define DEF_ATTR(_obj,_name,_mode) \ | |
149 | static struct attribute _obj = { \ | |
150 | .name = _name, .owner = THIS_MODULE, .mode = _mode } | |
151 | ||
152 | /********************************************************** | |
153 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
154 | stat/reset | |
155 | stat/packets_started | |
156 | stat/packets_finished | |
157 | stat/kb_written | |
158 | stat/kb_read | |
159 | stat/kb_read_gather | |
160 | write_queue/size | |
161 | write_queue/congestion_off | |
162 | write_queue/congestion_on | |
163 | **********************************************************/ | |
164 | ||
165 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
166 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
167 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
168 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
169 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
170 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
171 | ||
172 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
173 | &kobj_pkt_attr_st1, | |
174 | &kobj_pkt_attr_st2, | |
175 | &kobj_pkt_attr_st3, | |
176 | &kobj_pkt_attr_st4, | |
177 | &kobj_pkt_attr_st5, | |
178 | &kobj_pkt_attr_st6, | |
179 | NULL | |
180 | }; | |
181 | ||
182 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
183 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
184 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
185 | ||
186 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
187 | &kobj_pkt_attr_wq1, | |
188 | &kobj_pkt_attr_wq2, | |
189 | &kobj_pkt_attr_wq3, | |
190 | NULL | |
191 | }; | |
192 | ||
193 | /* declares a char buffer[64] _dbuf, copies data from | |
194 | * _b with length _l into it and ensures that _dbuf ends | |
195 | * with a \0 character. | |
196 | */ | |
197 | #define DECLARE_BUF_AS_STRING(_dbuf, _b, _l) \ | |
198 | char _dbuf[64]; int dlen = (_l) < 0 ? 0 : (_l); \ | |
199 | if (dlen >= sizeof(_dbuf)) dlen = sizeof(_dbuf)-1; \ | |
200 | memcpy(_dbuf, _b, dlen); _dbuf[dlen] = 0 | |
201 | ||
202 | static ssize_t kobj_pkt_show(struct kobject *kobj, | |
203 | struct attribute *attr, char *data) | |
204 | { | |
205 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
206 | int n = 0; | |
207 | int v; | |
208 | if (strcmp(attr->name, "packets_started") == 0) { | |
209 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
210 | ||
211 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
212 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
213 | ||
214 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
215 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
216 | ||
217 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
218 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
219 | ||
220 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
221 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
222 | ||
223 | } else if (strcmp(attr->name, "size") == 0) { | |
224 | spin_lock(&pd->lock); | |
225 | v = pd->bio_queue_size; | |
226 | spin_unlock(&pd->lock); | |
227 | n = sprintf(data, "%d\n", v); | |
228 | ||
229 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
230 | spin_lock(&pd->lock); | |
231 | v = pd->write_congestion_off; | |
232 | spin_unlock(&pd->lock); | |
233 | n = sprintf(data, "%d\n", v); | |
234 | ||
235 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
236 | spin_lock(&pd->lock); | |
237 | v = pd->write_congestion_on; | |
238 | spin_unlock(&pd->lock); | |
239 | n = sprintf(data, "%d\n", v); | |
240 | } | |
241 | return n; | |
242 | } | |
243 | ||
244 | static void init_write_congestion_marks(int* lo, int* hi) | |
245 | { | |
246 | if (*hi > 0) { | |
247 | *hi = max(*hi, 500); | |
248 | *hi = min(*hi, 1000000); | |
249 | if (*lo <= 0) | |
250 | *lo = *hi - 100; | |
251 | else { | |
252 | *lo = min(*lo, *hi - 100); | |
253 | *lo = max(*lo, 100); | |
254 | } | |
255 | } else { | |
256 | *hi = -1; | |
257 | *lo = -1; | |
258 | } | |
259 | } | |
260 | ||
261 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
262 | struct attribute *attr, | |
263 | const char *data, size_t len) | |
264 | { | |
265 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
266 | int val; | |
267 | DECLARE_BUF_AS_STRING(dbuf, data, len); /* ensure sscanf scans a string */ | |
268 | ||
269 | if (strcmp(attr->name, "reset") == 0 && dlen > 0) { | |
270 | pd->stats.pkt_started = 0; | |
271 | pd->stats.pkt_ended = 0; | |
272 | pd->stats.secs_w = 0; | |
273 | pd->stats.secs_rg = 0; | |
274 | pd->stats.secs_r = 0; | |
275 | ||
276 | } else if (strcmp(attr->name, "congestion_off") == 0 | |
277 | && sscanf(dbuf, "%d", &val) == 1) { | |
278 | spin_lock(&pd->lock); | |
279 | pd->write_congestion_off = val; | |
280 | init_write_congestion_marks(&pd->write_congestion_off, | |
281 | &pd->write_congestion_on); | |
282 | spin_unlock(&pd->lock); | |
283 | ||
284 | } else if (strcmp(attr->name, "congestion_on") == 0 | |
285 | && sscanf(dbuf, "%d", &val) == 1) { | |
286 | spin_lock(&pd->lock); | |
287 | pd->write_congestion_on = val; | |
288 | init_write_congestion_marks(&pd->write_congestion_off, | |
289 | &pd->write_congestion_on); | |
290 | spin_unlock(&pd->lock); | |
291 | } | |
292 | return len; | |
293 | } | |
294 | ||
295 | static struct sysfs_ops kobj_pkt_ops = { | |
296 | .show = kobj_pkt_show, | |
297 | .store = kobj_pkt_store | |
298 | }; | |
299 | static struct kobj_type kobj_pkt_type_stat = { | |
300 | .release = pkt_kobj_release, | |
301 | .sysfs_ops = &kobj_pkt_ops, | |
302 | .default_attrs = kobj_pkt_attrs_stat | |
303 | }; | |
304 | static struct kobj_type kobj_pkt_type_wqueue = { | |
305 | .release = pkt_kobj_release, | |
306 | .sysfs_ops = &kobj_pkt_ops, | |
307 | .default_attrs = kobj_pkt_attrs_wqueue | |
308 | }; | |
309 | ||
310 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
311 | { | |
312 | if (class_pktcdvd) { | |
313 | pd->clsdev = class_device_create(class_pktcdvd, | |
314 | NULL, pd->pkt_dev, | |
315 | NULL, "%s", pd->name); | |
316 | if (IS_ERR(pd->clsdev)) | |
317 | pd->clsdev = NULL; | |
318 | } | |
319 | if (pd->clsdev) { | |
320 | pd->kobj_stat = pkt_kobj_create(pd, "stat", | |
321 | &pd->clsdev->kobj, | |
322 | &kobj_pkt_type_stat); | |
323 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
324 | &pd->clsdev->kobj, | |
325 | &kobj_pkt_type_wqueue); | |
326 | } | |
327 | } | |
328 | ||
329 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
330 | { | |
331 | pkt_kobj_remove(pd->kobj_stat); | |
332 | pkt_kobj_remove(pd->kobj_wqueue); | |
333 | if (class_pktcdvd) | |
334 | class_device_destroy(class_pktcdvd, pd->pkt_dev); | |
335 | } | |
336 | ||
337 | ||
338 | /******************************************************************** | |
339 | /sys/class/pktcdvd/ | |
340 | add map block device | |
341 | remove unmap packet dev | |
342 | device_map show mappings | |
343 | *******************************************************************/ | |
344 | ||
345 | static void class_pktcdvd_release(struct class *cls) | |
346 | { | |
347 | kfree(cls); | |
348 | } | |
349 | static ssize_t class_pktcdvd_show_map(struct class *c, char *data) | |
350 | { | |
351 | int n = 0; | |
352 | int idx; | |
353 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
354 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
355 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
356 | if (!pd) | |
357 | continue; | |
358 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
359 | pd->name, | |
360 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
361 | MAJOR(pd->bdev->bd_dev), | |
362 | MINOR(pd->bdev->bd_dev)); | |
363 | } | |
364 | mutex_unlock(&ctl_mutex); | |
365 | return n; | |
366 | } | |
367 | ||
368 | static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf, | |
369 | size_t count) | |
370 | { | |
371 | unsigned int major, minor; | |
372 | DECLARE_BUF_AS_STRING(dbuf, buf, count); | |
373 | if (sscanf(dbuf, "%u:%u", &major, &minor) == 2) { | |
374 | pkt_setup_dev(MKDEV(major, minor), NULL); | |
375 | return count; | |
376 | } | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf, | |
381 | size_t count) | |
382 | { | |
383 | unsigned int major, minor; | |
384 | DECLARE_BUF_AS_STRING(dbuf, buf, count); | |
385 | if (sscanf(dbuf, "%u:%u", &major, &minor) == 2) { | |
386 | pkt_remove_dev(MKDEV(major, minor)); | |
387 | return count; | |
388 | } | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | static struct class_attribute class_pktcdvd_attrs[] = { | |
393 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
394 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
395 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
396 | __ATTR_NULL | |
397 | }; | |
398 | ||
399 | ||
400 | static int pkt_sysfs_init(void) | |
401 | { | |
402 | int ret = 0; | |
403 | ||
404 | /* | |
405 | * create control files in sysfs | |
406 | * /sys/class/pktcdvd/... | |
407 | */ | |
408 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
409 | if (!class_pktcdvd) | |
410 | return -ENOMEM; | |
411 | class_pktcdvd->name = DRIVER_NAME; | |
412 | class_pktcdvd->owner = THIS_MODULE; | |
413 | class_pktcdvd->class_release = class_pktcdvd_release; | |
414 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
415 | ret = class_register(class_pktcdvd); | |
416 | if (ret) { | |
417 | kfree(class_pktcdvd); | |
418 | class_pktcdvd = NULL; | |
419 | printk(DRIVER_NAME": failed to create class pktcdvd\n"); | |
420 | return ret; | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static void pkt_sysfs_cleanup(void) | |
426 | { | |
427 | if (class_pktcdvd) | |
428 | class_destroy(class_pktcdvd); | |
429 | class_pktcdvd = NULL; | |
430 | } | |
431 | ||
432 | /******************************************************************** | |
433 | entries in debugfs | |
434 | ||
435 | /debugfs/pktcdvd[0-7]/ | |
436 | info | |
437 | ||
438 | *******************************************************************/ | |
439 | ||
440 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
441 | { | |
442 | return pkt_seq_show(m, p); | |
443 | } | |
444 | ||
445 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
446 | { | |
447 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
448 | } | |
449 | ||
450 | static struct file_operations debug_fops = { | |
451 | .open = pkt_debugfs_fops_open, | |
452 | .read = seq_read, | |
453 | .llseek = seq_lseek, | |
454 | .release = single_release, | |
455 | .owner = THIS_MODULE, | |
456 | }; | |
457 | ||
458 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
459 | { | |
460 | if (!pkt_debugfs_root) | |
461 | return; | |
462 | pd->dfs_f_info = NULL; | |
463 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); | |
464 | if (IS_ERR(pd->dfs_d_root)) { | |
465 | pd->dfs_d_root = NULL; | |
466 | return; | |
467 | } | |
468 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, | |
469 | pd->dfs_d_root, pd, &debug_fops); | |
470 | if (IS_ERR(pd->dfs_f_info)) { | |
471 | pd->dfs_f_info = NULL; | |
472 | return; | |
473 | } | |
474 | } | |
475 | ||
476 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
477 | { | |
478 | if (!pkt_debugfs_root) | |
479 | return; | |
480 | if (pd->dfs_f_info) | |
481 | debugfs_remove(pd->dfs_f_info); | |
482 | pd->dfs_f_info = NULL; | |
483 | if (pd->dfs_d_root) | |
484 | debugfs_remove(pd->dfs_d_root); | |
485 | pd->dfs_d_root = NULL; | |
486 | } | |
487 | ||
488 | static void pkt_debugfs_init(void) | |
489 | { | |
490 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
491 | if (IS_ERR(pkt_debugfs_root)) { | |
492 | pkt_debugfs_root = NULL; | |
493 | return; | |
494 | } | |
495 | } | |
496 | ||
497 | static void pkt_debugfs_cleanup(void) | |
498 | { | |
499 | if (!pkt_debugfs_root) | |
500 | return; | |
501 | debugfs_remove(pkt_debugfs_root); | |
502 | pkt_debugfs_root = NULL; | |
503 | } | |
504 | ||
505 | /* ----------------------------------------------------------*/ | |
506 | ||
1da177e4 LT |
507 | |
508 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
509 | { | |
510 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
511 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
7822082d | 512 | VPRINTK(DRIVER_NAME": queue empty\n"); |
1da177e4 LT |
513 | atomic_set(&pd->iosched.attention, 1); |
514 | wake_up(&pd->wqueue); | |
515 | } | |
516 | } | |
517 | ||
518 | static void pkt_bio_destructor(struct bio *bio) | |
519 | { | |
520 | kfree(bio->bi_io_vec); | |
521 | kfree(bio); | |
522 | } | |
523 | ||
524 | static struct bio *pkt_bio_alloc(int nr_iovecs) | |
525 | { | |
526 | struct bio_vec *bvl = NULL; | |
527 | struct bio *bio; | |
528 | ||
529 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); | |
530 | if (!bio) | |
531 | goto no_bio; | |
532 | bio_init(bio); | |
533 | ||
1107d2e0 | 534 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
1da177e4 LT |
535 | if (!bvl) |
536 | goto no_bvl; | |
1da177e4 LT |
537 | |
538 | bio->bi_max_vecs = nr_iovecs; | |
539 | bio->bi_io_vec = bvl; | |
540 | bio->bi_destructor = pkt_bio_destructor; | |
541 | ||
542 | return bio; | |
543 | ||
544 | no_bvl: | |
545 | kfree(bio); | |
546 | no_bio: | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Allocate a packet_data struct | |
552 | */ | |
e1bc89bc | 553 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
554 | { |
555 | int i; | |
556 | struct packet_data *pkt; | |
557 | ||
1107d2e0 | 558 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
559 | if (!pkt) |
560 | goto no_pkt; | |
1da177e4 | 561 | |
e1bc89bc PO |
562 | pkt->frames = frames; |
563 | pkt->w_bio = pkt_bio_alloc(frames); | |
1da177e4 LT |
564 | if (!pkt->w_bio) |
565 | goto no_bio; | |
566 | ||
e1bc89bc | 567 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
568 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
569 | if (!pkt->pages[i]) | |
570 | goto no_page; | |
571 | } | |
572 | ||
573 | spin_lock_init(&pkt->lock); | |
574 | ||
e1bc89bc | 575 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
576 | struct bio *bio = pkt_bio_alloc(1); |
577 | if (!bio) | |
578 | goto no_rd_bio; | |
579 | pkt->r_bios[i] = bio; | |
580 | } | |
581 | ||
582 | return pkt; | |
583 | ||
584 | no_rd_bio: | |
e1bc89bc | 585 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
586 | struct bio *bio = pkt->r_bios[i]; |
587 | if (bio) | |
588 | bio_put(bio); | |
589 | } | |
590 | ||
591 | no_page: | |
e1bc89bc | 592 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
593 | if (pkt->pages[i]) |
594 | __free_page(pkt->pages[i]); | |
595 | bio_put(pkt->w_bio); | |
596 | no_bio: | |
597 | kfree(pkt); | |
598 | no_pkt: | |
599 | return NULL; | |
600 | } | |
601 | ||
602 | /* | |
603 | * Free a packet_data struct | |
604 | */ | |
605 | static void pkt_free_packet_data(struct packet_data *pkt) | |
606 | { | |
607 | int i; | |
608 | ||
e1bc89bc | 609 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
610 | struct bio *bio = pkt->r_bios[i]; |
611 | if (bio) | |
612 | bio_put(bio); | |
613 | } | |
e1bc89bc | 614 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
615 | __free_page(pkt->pages[i]); |
616 | bio_put(pkt->w_bio); | |
617 | kfree(pkt); | |
618 | } | |
619 | ||
620 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
621 | { | |
622 | struct packet_data *pkt, *next; | |
623 | ||
624 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
625 | ||
626 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
627 | pkt_free_packet_data(pkt); | |
628 | } | |
e1bc89bc | 629 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
630 | } |
631 | ||
632 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
633 | { | |
634 | struct packet_data *pkt; | |
635 | ||
e1bc89bc PO |
636 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
637 | ||
1da177e4 | 638 | while (nr_packets > 0) { |
e1bc89bc | 639 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
640 | if (!pkt) { |
641 | pkt_shrink_pktlist(pd); | |
642 | return 0; | |
643 | } | |
644 | pkt->id = nr_packets; | |
645 | pkt->pd = pd; | |
646 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
647 | nr_packets--; | |
648 | } | |
649 | return 1; | |
650 | } | |
651 | ||
1da177e4 LT |
652 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
653 | { | |
654 | struct rb_node *n = rb_next(&node->rb_node); | |
655 | if (!n) | |
656 | return NULL; | |
657 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
658 | } | |
659 | ||
ac893963 | 660 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
661 | { |
662 | rb_erase(&node->rb_node, &pd->bio_queue); | |
663 | mempool_free(node, pd->rb_pool); | |
664 | pd->bio_queue_size--; | |
665 | BUG_ON(pd->bio_queue_size < 0); | |
666 | } | |
667 | ||
668 | /* | |
669 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
670 | */ | |
671 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
672 | { | |
673 | struct rb_node *n = pd->bio_queue.rb_node; | |
674 | struct rb_node *next; | |
675 | struct pkt_rb_node *tmp; | |
676 | ||
677 | if (!n) { | |
678 | BUG_ON(pd->bio_queue_size > 0); | |
679 | return NULL; | |
680 | } | |
681 | ||
682 | for (;;) { | |
683 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
684 | if (s <= tmp->bio->bi_sector) | |
685 | next = n->rb_left; | |
686 | else | |
687 | next = n->rb_right; | |
688 | if (!next) | |
689 | break; | |
690 | n = next; | |
691 | } | |
692 | ||
693 | if (s > tmp->bio->bi_sector) { | |
694 | tmp = pkt_rbtree_next(tmp); | |
695 | if (!tmp) | |
696 | return NULL; | |
697 | } | |
698 | BUG_ON(s > tmp->bio->bi_sector); | |
699 | return tmp; | |
700 | } | |
701 | ||
702 | /* | |
703 | * Insert a node into the pd->bio_queue rb tree. | |
704 | */ | |
705 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
706 | { | |
707 | struct rb_node **p = &pd->bio_queue.rb_node; | |
708 | struct rb_node *parent = NULL; | |
709 | sector_t s = node->bio->bi_sector; | |
710 | struct pkt_rb_node *tmp; | |
711 | ||
712 | while (*p) { | |
713 | parent = *p; | |
714 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
715 | if (s < tmp->bio->bi_sector) | |
716 | p = &(*p)->rb_left; | |
717 | else | |
718 | p = &(*p)->rb_right; | |
719 | } | |
720 | rb_link_node(&node->rb_node, parent, p); | |
721 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
722 | pd->bio_queue_size++; | |
723 | } | |
724 | ||
725 | /* | |
726 | * Add a bio to a single linked list defined by its head and tail pointers. | |
727 | */ | |
ac893963 | 728 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) |
1da177e4 LT |
729 | { |
730 | bio->bi_next = NULL; | |
731 | if (*list_tail) { | |
732 | BUG_ON((*list_head) == NULL); | |
733 | (*list_tail)->bi_next = bio; | |
734 | (*list_tail) = bio; | |
735 | } else { | |
736 | BUG_ON((*list_head) != NULL); | |
737 | (*list_head) = bio; | |
738 | (*list_tail) = bio; | |
739 | } | |
740 | } | |
741 | ||
742 | /* | |
743 | * Remove and return the first bio from a single linked list defined by its | |
744 | * head and tail pointers. | |
745 | */ | |
746 | static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) | |
747 | { | |
748 | struct bio *bio; | |
749 | ||
750 | if (*list_head == NULL) | |
751 | return NULL; | |
752 | ||
753 | bio = *list_head; | |
754 | *list_head = bio->bi_next; | |
755 | if (*list_head == NULL) | |
756 | *list_tail = NULL; | |
757 | ||
758 | bio->bi_next = NULL; | |
759 | return bio; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Send a packet_command to the underlying block device and | |
764 | * wait for completion. | |
765 | */ | |
766 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
767 | { | |
406c9b60 | 768 | request_queue_t *q = bdev_get_queue(pd->bdev); |
1da177e4 | 769 | struct request *rq; |
406c9b60 CH |
770 | int ret = 0; |
771 | ||
772 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
773 | WRITE : READ, __GFP_WAIT); | |
774 | ||
775 | if (cgc->buflen) { | |
776 | if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT)) | |
777 | goto out; | |
778 | } | |
1da177e4 | 779 | |
406c9b60 CH |
780 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); |
781 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); | |
782 | if (sizeof(rq->cmd) > CDROM_PACKET_SIZE) | |
783 | memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE); | |
1da177e4 | 784 | |
1da177e4 | 785 | rq->timeout = 60*HZ; |
4aff5e23 JA |
786 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
787 | rq->cmd_flags |= REQ_HARDBARRIER; | |
1da177e4 | 788 | if (cgc->quiet) |
4aff5e23 | 789 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 | 790 | |
406c9b60 CH |
791 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
792 | ret = rq->errors; | |
793 | out: | |
1da177e4 | 794 | blk_put_request(rq); |
406c9b60 | 795 | return ret; |
1da177e4 LT |
796 | } |
797 | ||
798 | /* | |
799 | * A generic sense dump / resolve mechanism should be implemented across | |
800 | * all ATAPI + SCSI devices. | |
801 | */ | |
802 | static void pkt_dump_sense(struct packet_command *cgc) | |
803 | { | |
804 | static char *info[9] = { "No sense", "Recovered error", "Not ready", | |
805 | "Medium error", "Hardware error", "Illegal request", | |
806 | "Unit attention", "Data protect", "Blank check" }; | |
807 | int i; | |
808 | struct request_sense *sense = cgc->sense; | |
809 | ||
7822082d | 810 | printk(DRIVER_NAME":"); |
1da177e4 LT |
811 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
812 | printk(" %02x", cgc->cmd[i]); | |
813 | printk(" - "); | |
814 | ||
815 | if (sense == NULL) { | |
816 | printk("no sense\n"); | |
817 | return; | |
818 | } | |
819 | ||
820 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); | |
821 | ||
822 | if (sense->sense_key > 8) { | |
823 | printk(" (INVALID)\n"); | |
824 | return; | |
825 | } | |
826 | ||
827 | printk(" (%s)\n", info[sense->sense_key]); | |
828 | } | |
829 | ||
830 | /* | |
831 | * flush the drive cache to media | |
832 | */ | |
833 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
834 | { | |
835 | struct packet_command cgc; | |
836 | ||
837 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
838 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
839 | cgc.quiet = 1; | |
840 | ||
841 | /* | |
842 | * the IMMED bit -- we default to not setting it, although that | |
843 | * would allow a much faster close, this is safer | |
844 | */ | |
845 | #if 0 | |
846 | cgc.cmd[1] = 1 << 1; | |
847 | #endif | |
848 | return pkt_generic_packet(pd, &cgc); | |
849 | } | |
850 | ||
851 | /* | |
852 | * speed is given as the normal factor, e.g. 4 for 4x | |
853 | */ | |
854 | static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed) | |
855 | { | |
856 | struct packet_command cgc; | |
857 | struct request_sense sense; | |
858 | int ret; | |
859 | ||
860 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
861 | cgc.sense = &sense; | |
862 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
863 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
864 | cgc.cmd[3] = read_speed & 0xff; | |
865 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
866 | cgc.cmd[5] = write_speed & 0xff; | |
867 | ||
868 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
869 | pkt_dump_sense(&cgc); | |
870 | ||
871 | return ret; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Queue a bio for processing by the low-level CD device. Must be called | |
876 | * from process context. | |
877 | */ | |
46c271be | 878 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
879 | { |
880 | spin_lock(&pd->iosched.lock); | |
881 | if (bio_data_dir(bio) == READ) { | |
882 | pkt_add_list_last(bio, &pd->iosched.read_queue, | |
883 | &pd->iosched.read_queue_tail); | |
1da177e4 LT |
884 | } else { |
885 | pkt_add_list_last(bio, &pd->iosched.write_queue, | |
886 | &pd->iosched.write_queue_tail); | |
887 | } | |
888 | spin_unlock(&pd->iosched.lock); | |
889 | ||
890 | atomic_set(&pd->iosched.attention, 1); | |
891 | wake_up(&pd->wqueue); | |
892 | } | |
893 | ||
894 | /* | |
895 | * Process the queued read/write requests. This function handles special | |
896 | * requirements for CDRW drives: | |
897 | * - A cache flush command must be inserted before a read request if the | |
898 | * previous request was a write. | |
46c271be | 899 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 900 | * than necessary. |
46c271be PO |
901 | * - Optimize for throughput at the expense of latency. This means that streaming |
902 | * writes will never be interrupted by a read, but if the drive has to seek | |
903 | * before the next write, switch to reading instead if there are any pending | |
904 | * read requests. | |
1da177e4 LT |
905 | * - Set the read speed according to current usage pattern. When only reading |
906 | * from the device, it's best to use the highest possible read speed, but | |
907 | * when switching often between reading and writing, it's better to have the | |
908 | * same read and write speeds. | |
1da177e4 LT |
909 | */ |
910 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
911 | { | |
1da177e4 LT |
912 | |
913 | if (atomic_read(&pd->iosched.attention) == 0) | |
914 | return; | |
915 | atomic_set(&pd->iosched.attention, 0); | |
916 | ||
1da177e4 LT |
917 | for (;;) { |
918 | struct bio *bio; | |
46c271be | 919 | int reads_queued, writes_queued; |
1da177e4 LT |
920 | |
921 | spin_lock(&pd->iosched.lock); | |
922 | reads_queued = (pd->iosched.read_queue != NULL); | |
923 | writes_queued = (pd->iosched.write_queue != NULL); | |
1da177e4 LT |
924 | spin_unlock(&pd->iosched.lock); |
925 | ||
926 | if (!reads_queued && !writes_queued) | |
927 | break; | |
928 | ||
929 | if (pd->iosched.writing) { | |
46c271be PO |
930 | int need_write_seek = 1; |
931 | spin_lock(&pd->iosched.lock); | |
932 | bio = pd->iosched.write_queue; | |
933 | spin_unlock(&pd->iosched.lock); | |
934 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
935 | need_write_seek = 0; | |
936 | if (need_write_seek && reads_queued) { | |
1da177e4 | 937 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
7822082d | 938 | VPRINTK(DRIVER_NAME": write, waiting\n"); |
1da177e4 LT |
939 | break; |
940 | } | |
941 | pkt_flush_cache(pd); | |
942 | pd->iosched.writing = 0; | |
943 | } | |
944 | } else { | |
945 | if (!reads_queued && writes_queued) { | |
946 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
7822082d | 947 | VPRINTK(DRIVER_NAME": read, waiting\n"); |
1da177e4 LT |
948 | break; |
949 | } | |
950 | pd->iosched.writing = 1; | |
951 | } | |
952 | } | |
953 | ||
954 | spin_lock(&pd->iosched.lock); | |
955 | if (pd->iosched.writing) { | |
956 | bio = pkt_get_list_first(&pd->iosched.write_queue, | |
957 | &pd->iosched.write_queue_tail); | |
958 | } else { | |
959 | bio = pkt_get_list_first(&pd->iosched.read_queue, | |
960 | &pd->iosched.read_queue_tail); | |
961 | } | |
962 | spin_unlock(&pd->iosched.lock); | |
963 | ||
964 | if (!bio) | |
965 | continue; | |
966 | ||
967 | if (bio_data_dir(bio) == READ) | |
968 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
46c271be | 969 | else { |
1da177e4 | 970 | pd->iosched.successive_reads = 0; |
46c271be PO |
971 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
972 | } | |
1da177e4 LT |
973 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
974 | if (pd->read_speed == pd->write_speed) { | |
975 | pd->read_speed = MAX_SPEED; | |
976 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
977 | } | |
978 | } else { | |
979 | if (pd->read_speed != pd->write_speed) { | |
980 | pd->read_speed = pd->write_speed; | |
981 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
982 | } | |
983 | } | |
984 | ||
985 | atomic_inc(&pd->cdrw.pending_bios); | |
986 | generic_make_request(bio); | |
987 | } | |
988 | } | |
989 | ||
990 | /* | |
991 | * Special care is needed if the underlying block device has a small | |
992 | * max_phys_segments value. | |
993 | */ | |
994 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q) | |
995 | { | |
996 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { | |
997 | /* | |
998 | * The cdrom device can handle one segment/frame | |
999 | */ | |
1000 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
1001 | return 0; | |
1002 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { | |
1003 | /* | |
1004 | * We can handle this case at the expense of some extra memory | |
1005 | * copies during write operations | |
1006 | */ | |
1007 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
1008 | return 0; | |
1009 | } else { | |
7822082d | 1010 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); |
1da177e4 LT |
1011 | return -EIO; |
1012 | } | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page | |
1017 | */ | |
1018 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) | |
1019 | { | |
1020 | unsigned int copy_size = CD_FRAMESIZE; | |
1021 | ||
1022 | while (copy_size > 0) { | |
1023 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); | |
1024 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + | |
1025 | src_bvl->bv_offset + offs; | |
1026 | void *vto = page_address(dst_page) + dst_offs; | |
1027 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); | |
1028 | ||
1029 | BUG_ON(len < 0); | |
1030 | memcpy(vto, vfrom, len); | |
1031 | kunmap_atomic(vfrom, KM_USER0); | |
1032 | ||
1033 | seg++; | |
1034 | offs = 0; | |
1035 | dst_offs += len; | |
1036 | copy_size -= len; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Copy all data for this packet to pkt->pages[], so that | |
1042 | * a) The number of required segments for the write bio is minimized, which | |
1043 | * is necessary for some scsi controllers. | |
1044 | * b) The data can be used as cache to avoid read requests if we receive a | |
1045 | * new write request for the same zone. | |
1046 | */ | |
72772323 | 1047 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
1048 | { |
1049 | int f, p, offs; | |
1050 | ||
1051 | /* Copy all data to pkt->pages[] */ | |
1052 | p = 0; | |
1053 | offs = 0; | |
1054 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1055 | if (bvec[f].bv_page != pkt->pages[p]) { |
1056 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; | |
1da177e4 LT |
1057 | void *vto = page_address(pkt->pages[p]) + offs; |
1058 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
1059 | kunmap_atomic(vfrom, KM_USER0); | |
72772323 PO |
1060 | bvec[f].bv_page = pkt->pages[p]; |
1061 | bvec[f].bv_offset = offs; | |
1da177e4 | 1062 | } else { |
72772323 | 1063 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
1064 | } |
1065 | offs += CD_FRAMESIZE; | |
1066 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
1067 | offs = 0; |
1068 | p++; | |
1069 | } | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err) | |
1074 | { | |
1075 | struct packet_data *pkt = bio->bi_private; | |
1076 | struct pktcdvd_device *pd = pkt->pd; | |
1077 | BUG_ON(!pd); | |
1078 | ||
1079 | if (bio->bi_size) | |
1080 | return 1; | |
1081 | ||
1082 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, | |
1083 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); | |
1084 | ||
1085 | if (err) | |
1086 | atomic_inc(&pkt->io_errors); | |
1087 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
1088 | atomic_inc(&pkt->run_sm); | |
1089 | wake_up(&pd->wqueue); | |
1090 | } | |
1091 | pkt_bio_finished(pd); | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err) | |
1097 | { | |
1098 | struct packet_data *pkt = bio->bi_private; | |
1099 | struct pktcdvd_device *pd = pkt->pd; | |
1100 | BUG_ON(!pd); | |
1101 | ||
1102 | if (bio->bi_size) | |
1103 | return 1; | |
1104 | ||
1105 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); | |
1106 | ||
1107 | pd->stats.pkt_ended++; | |
1108 | ||
1109 | pkt_bio_finished(pd); | |
1110 | atomic_dec(&pkt->io_wait); | |
1111 | atomic_inc(&pkt->run_sm); | |
1112 | wake_up(&pd->wqueue); | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Schedule reads for the holes in a packet | |
1118 | */ | |
1119 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1120 | { | |
1121 | int frames_read = 0; | |
1122 | struct bio *bio; | |
1123 | int f; | |
1124 | char written[PACKET_MAX_SIZE]; | |
1125 | ||
1126 | BUG_ON(!pkt->orig_bios); | |
1127 | ||
1128 | atomic_set(&pkt->io_wait, 0); | |
1129 | atomic_set(&pkt->io_errors, 0); | |
1130 | ||
1da177e4 LT |
1131 | /* |
1132 | * Figure out which frames we need to read before we can write. | |
1133 | */ | |
1134 | memset(written, 0, sizeof(written)); | |
1135 | spin_lock(&pkt->lock); | |
1136 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1137 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1138 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1139 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1140 | BUG_ON(first_frame < 0); |
1141 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1142 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1143 | written[f] = 1; | |
1144 | } | |
1145 | spin_unlock(&pkt->lock); | |
1146 | ||
06e7ab53 PO |
1147 | if (pkt->cache_valid) { |
1148 | VPRINTK("pkt_gather_data: zone %llx cached\n", | |
1149 | (unsigned long long)pkt->sector); | |
1150 | goto out_account; | |
1151 | } | |
1152 | ||
1da177e4 LT |
1153 | /* |
1154 | * Schedule reads for missing parts of the packet. | |
1155 | */ | |
1156 | for (f = 0; f < pkt->frames; f++) { | |
1157 | int p, offset; | |
1158 | if (written[f]) | |
1159 | continue; | |
1160 | bio = pkt->r_bios[f]; | |
1161 | bio_init(bio); | |
1162 | bio->bi_max_vecs = 1; | |
1163 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
1164 | bio->bi_bdev = pd->bdev; | |
1165 | bio->bi_end_io = pkt_end_io_read; | |
1166 | bio->bi_private = pkt; | |
1167 | ||
1168 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1169 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1170 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", | |
1171 | f, pkt->pages[p], offset); | |
1172 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1173 | BUG(); | |
1174 | ||
1175 | atomic_inc(&pkt->io_wait); | |
1176 | bio->bi_rw = READ; | |
46c271be | 1177 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1178 | frames_read++; |
1179 | } | |
1180 | ||
1181 | out_account: | |
1182 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", | |
1183 | frames_read, (unsigned long long)pkt->sector); | |
1184 | pd->stats.pkt_started++; | |
1185 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | /* | |
1189 | * Find a packet matching zone, or the least recently used packet if | |
1190 | * there is no match. | |
1191 | */ | |
1192 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1193 | { | |
1194 | struct packet_data *pkt; | |
1195 | ||
1196 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1197 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1198 | list_del_init(&pkt->list); | |
1199 | if (pkt->sector != zone) | |
1200 | pkt->cache_valid = 0; | |
610827de | 1201 | return pkt; |
1da177e4 LT |
1202 | } |
1203 | } | |
610827de PO |
1204 | BUG(); |
1205 | return NULL; | |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1209 | { | |
1210 | if (pkt->cache_valid) { | |
1211 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1212 | } else { | |
1213 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * recover a failed write, query for relocation if possible | |
1219 | * | |
1220 | * returns 1 if recovery is possible, or 0 if not | |
1221 | * | |
1222 | */ | |
1223 | static int pkt_start_recovery(struct packet_data *pkt) | |
1224 | { | |
1225 | /* | |
1226 | * FIXME. We need help from the file system to implement | |
1227 | * recovery handling. | |
1228 | */ | |
1229 | return 0; | |
1230 | #if 0 | |
1231 | struct request *rq = pkt->rq; | |
1232 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1233 | struct block_device *pkt_bdev; | |
1234 | struct super_block *sb = NULL; | |
1235 | unsigned long old_block, new_block; | |
1236 | sector_t new_sector; | |
1237 | ||
1238 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1239 | if (pkt_bdev) { | |
1240 | sb = get_super(pkt_bdev); | |
1241 | bdput(pkt_bdev); | |
1242 | } | |
1243 | ||
1244 | if (!sb) | |
1245 | return 0; | |
1246 | ||
1247 | if (!sb->s_op || !sb->s_op->relocate_blocks) | |
1248 | goto out; | |
1249 | ||
1250 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1251 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1252 | goto out; | |
1253 | ||
1254 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1255 | pkt->sector = new_sector; | |
1256 | ||
1257 | pkt->bio->bi_sector = new_sector; | |
1258 | pkt->bio->bi_next = NULL; | |
1259 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; | |
1260 | pkt->bio->bi_idx = 0; | |
1261 | ||
1262 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); | |
1263 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); | |
1264 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); | |
1265 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); | |
1266 | BUG_ON(pkt->bio->bi_private != pkt); | |
1267 | ||
1268 | drop_super(sb); | |
1269 | return 1; | |
1270 | ||
1271 | out: | |
1272 | drop_super(sb); | |
1273 | return 0; | |
1274 | #endif | |
1275 | } | |
1276 | ||
1277 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1278 | { | |
1279 | #if PACKET_DEBUG > 1 | |
1280 | static const char *state_name[] = { | |
1281 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1282 | }; | |
1283 | enum packet_data_state old_state = pkt->state; | |
1284 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, | |
1285 | state_name[old_state], state_name[state]); | |
1286 | #endif | |
1287 | pkt->state = state; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Scan the work queue to see if we can start a new packet. | |
1292 | * returns non-zero if any work was done. | |
1293 | */ | |
1294 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1295 | { | |
1296 | struct packet_data *pkt, *p; | |
1297 | struct bio *bio = NULL; | |
1298 | sector_t zone = 0; /* Suppress gcc warning */ | |
1299 | struct pkt_rb_node *node, *first_node; | |
1300 | struct rb_node *n; | |
0a0fc960 | 1301 | int wakeup; |
1da177e4 LT |
1302 | |
1303 | VPRINTK("handle_queue\n"); | |
1304 | ||
1305 | atomic_set(&pd->scan_queue, 0); | |
1306 | ||
1307 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
1308 | VPRINTK("handle_queue: no pkt\n"); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Try to find a zone we are not already working on. | |
1314 | */ | |
1315 | spin_lock(&pd->lock); | |
1316 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1317 | if (!first_node) { | |
1318 | n = rb_first(&pd->bio_queue); | |
1319 | if (n) | |
1320 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1321 | } | |
1322 | node = first_node; | |
1323 | while (node) { | |
1324 | bio = node->bio; | |
1325 | zone = ZONE(bio->bi_sector, pd); | |
1326 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
7baeb6a5 PO |
1327 | if (p->sector == zone) { |
1328 | bio = NULL; | |
1da177e4 | 1329 | goto try_next_bio; |
7baeb6a5 | 1330 | } |
1da177e4 LT |
1331 | } |
1332 | break; | |
1333 | try_next_bio: | |
1334 | node = pkt_rbtree_next(node); | |
1335 | if (!node) { | |
1336 | n = rb_first(&pd->bio_queue); | |
1337 | if (n) | |
1338 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1339 | } | |
1340 | if (node == first_node) | |
1341 | node = NULL; | |
1342 | } | |
1343 | spin_unlock(&pd->lock); | |
1344 | if (!bio) { | |
1345 | VPRINTK("handle_queue: no bio\n"); | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1350 | |
1351 | pd->current_sector = zone + pd->settings.size; | |
1352 | pkt->sector = zone; | |
e1bc89bc | 1353 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1354 | pkt->write_size = 0; |
1355 | ||
1356 | /* | |
1357 | * Scan work queue for bios in the same zone and link them | |
1358 | * to this packet. | |
1359 | */ | |
1360 | spin_lock(&pd->lock); | |
1361 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); | |
1362 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { | |
1363 | bio = node->bio; | |
1364 | VPRINTK("pkt_handle_queue: found zone=%llx\n", | |
1365 | (unsigned long long)ZONE(bio->bi_sector, pd)); | |
1366 | if (ZONE(bio->bi_sector, pd) != zone) | |
1367 | break; | |
1368 | pkt_rbtree_erase(pd, node); | |
1369 | spin_lock(&pkt->lock); | |
1370 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); | |
1371 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
1372 | spin_unlock(&pkt->lock); | |
1373 | } | |
0a0fc960 TM |
1374 | /* check write congestion marks, and if bio_queue_size is |
1375 | below, wake up any waiters */ | |
1376 | wakeup = (pd->write_congestion_on > 0 | |
1377 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1378 | spin_unlock(&pd->lock); |
0a0fc960 TM |
1379 | if (wakeup) |
1380 | blk_clear_queue_congested(pd->disk->queue, WRITE); | |
1da177e4 LT |
1381 | |
1382 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1383 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1384 | atomic_set(&pkt->run_sm, 1); | |
1385 | ||
1386 | spin_lock(&pd->cdrw.active_list_lock); | |
1387 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1388 | spin_unlock(&pd->cdrw.active_list_lock); | |
1389 | ||
1390 | return 1; | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Assemble a bio to write one packet and queue the bio for processing | |
1395 | * by the underlying block device. | |
1396 | */ | |
1397 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1398 | { | |
1399 | struct bio *bio; | |
1da177e4 LT |
1400 | int f; |
1401 | int frames_write; | |
72772323 | 1402 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 LT |
1403 | |
1404 | for (f = 0; f < pkt->frames; f++) { | |
72772323 PO |
1405 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1406 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1da177e4 LT |
1407 | } |
1408 | ||
1409 | /* | |
72772323 | 1410 | * Fill-in bvec with data from orig_bios. |
1da177e4 LT |
1411 | */ |
1412 | frames_write = 0; | |
1413 | spin_lock(&pkt->lock); | |
1414 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1415 | int segment = bio->bi_idx; | |
1416 | int src_offs = 0; | |
1417 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1418 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1419 | BUG_ON(first_frame < 0); | |
1420 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1421 | for (f = first_frame; f < first_frame + num_frames; f++) { | |
1422 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); | |
1423 | ||
1424 | while (src_offs >= src_bvl->bv_len) { | |
1425 | src_offs -= src_bvl->bv_len; | |
1426 | segment++; | |
1427 | BUG_ON(segment >= bio->bi_vcnt); | |
1428 | src_bvl = bio_iovec_idx(bio, segment); | |
1429 | } | |
1430 | ||
1431 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { | |
72772323 PO |
1432 | bvec[f].bv_page = src_bvl->bv_page; |
1433 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; | |
1da177e4 LT |
1434 | } else { |
1435 | pkt_copy_bio_data(bio, segment, src_offs, | |
72772323 | 1436 | bvec[f].bv_page, bvec[f].bv_offset); |
1da177e4 LT |
1437 | } |
1438 | src_offs += CD_FRAMESIZE; | |
1439 | frames_write++; | |
1440 | } | |
1441 | } | |
1442 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); | |
1443 | spin_unlock(&pkt->lock); | |
1444 | ||
1445 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", | |
1446 | frames_write, (unsigned long long)pkt->sector); | |
1447 | BUG_ON(frames_write != pkt->write_size); | |
1448 | ||
1449 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1450 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1451 | pkt->cache_valid = 1; |
1452 | } else { | |
1453 | pkt->cache_valid = 0; | |
1454 | } | |
1455 | ||
1456 | /* Start the write request */ | |
1457 | bio_init(pkt->w_bio); | |
1458 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; | |
1459 | pkt->w_bio->bi_sector = pkt->sector; | |
1460 | pkt->w_bio->bi_bdev = pd->bdev; | |
1461 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1462 | pkt->w_bio->bi_private = pkt; | |
72772323 PO |
1463 | for (f = 0; f < pkt->frames; f++) |
1464 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) | |
1465 | BUG(); | |
7822082d | 1466 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1467 | |
1468 | atomic_set(&pkt->io_wait, 1); | |
1469 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1470 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1471 | } |
1472 | ||
1473 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1474 | { | |
1475 | struct bio *bio, *next; | |
1476 | ||
1477 | if (!uptodate) | |
1478 | pkt->cache_valid = 0; | |
1479 | ||
1480 | /* Finish all bios corresponding to this packet */ | |
1481 | bio = pkt->orig_bios; | |
1482 | while (bio) { | |
1483 | next = bio->bi_next; | |
1484 | bio->bi_next = NULL; | |
1485 | bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO); | |
1486 | bio = next; | |
1487 | } | |
1488 | pkt->orig_bios = pkt->orig_bios_tail = NULL; | |
1489 | } | |
1490 | ||
1491 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1492 | { | |
1493 | int uptodate; | |
1494 | ||
1495 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); | |
1496 | ||
1497 | for (;;) { | |
1498 | switch (pkt->state) { | |
1499 | case PACKET_WAITING_STATE: | |
1500 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1501 | return; | |
1502 | ||
1503 | pkt->sleep_time = 0; | |
1504 | pkt_gather_data(pd, pkt); | |
1505 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1506 | break; | |
1507 | ||
1508 | case PACKET_READ_WAIT_STATE: | |
1509 | if (atomic_read(&pkt->io_wait) > 0) | |
1510 | return; | |
1511 | ||
1512 | if (atomic_read(&pkt->io_errors) > 0) { | |
1513 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1514 | } else { | |
1515 | pkt_start_write(pd, pkt); | |
1516 | } | |
1517 | break; | |
1518 | ||
1519 | case PACKET_WRITE_WAIT_STATE: | |
1520 | if (atomic_read(&pkt->io_wait) > 0) | |
1521 | return; | |
1522 | ||
1523 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1524 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1525 | } else { | |
1526 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1527 | } | |
1528 | break; | |
1529 | ||
1530 | case PACKET_RECOVERY_STATE: | |
1531 | if (pkt_start_recovery(pkt)) { | |
1532 | pkt_start_write(pd, pkt); | |
1533 | } else { | |
1534 | VPRINTK("No recovery possible\n"); | |
1535 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1536 | } | |
1537 | break; | |
1538 | ||
1539 | case PACKET_FINISHED_STATE: | |
1540 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1541 | pkt_finish_packet(pkt, uptodate); | |
1542 | return; | |
1543 | ||
1544 | default: | |
1545 | BUG(); | |
1546 | break; | |
1547 | } | |
1548 | } | |
1549 | } | |
1550 | ||
1551 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1552 | { | |
1553 | struct packet_data *pkt, *next; | |
1554 | ||
1555 | VPRINTK("pkt_handle_packets\n"); | |
1556 | ||
1557 | /* | |
1558 | * Run state machine for active packets | |
1559 | */ | |
1560 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1561 | if (atomic_read(&pkt->run_sm) > 0) { | |
1562 | atomic_set(&pkt->run_sm, 0); | |
1563 | pkt_run_state_machine(pd, pkt); | |
1564 | } | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * Move no longer active packets to the free list | |
1569 | */ | |
1570 | spin_lock(&pd->cdrw.active_list_lock); | |
1571 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1572 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1573 | list_del(&pkt->list); | |
1574 | pkt_put_packet_data(pd, pkt); | |
1575 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1576 | atomic_set(&pd->scan_queue, 1); | |
1577 | } | |
1578 | } | |
1579 | spin_unlock(&pd->cdrw.active_list_lock); | |
1580 | } | |
1581 | ||
1582 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1583 | { | |
1584 | struct packet_data *pkt; | |
1585 | int i; | |
1586 | ||
ae7642bb | 1587 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1588 | states[i] = 0; |
1589 | ||
1590 | spin_lock(&pd->cdrw.active_list_lock); | |
1591 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1592 | states[pkt->state]++; | |
1593 | } | |
1594 | spin_unlock(&pd->cdrw.active_list_lock); | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * kcdrwd is woken up when writes have been queued for one of our | |
1599 | * registered devices | |
1600 | */ | |
1601 | static int kcdrwd(void *foobar) | |
1602 | { | |
1603 | struct pktcdvd_device *pd = foobar; | |
1604 | struct packet_data *pkt; | |
1605 | long min_sleep_time, residue; | |
1606 | ||
1607 | set_user_nice(current, -20); | |
1608 | ||
1609 | for (;;) { | |
1610 | DECLARE_WAITQUEUE(wait, current); | |
1611 | ||
1612 | /* | |
1613 | * Wait until there is something to do | |
1614 | */ | |
1615 | add_wait_queue(&pd->wqueue, &wait); | |
1616 | for (;;) { | |
1617 | set_current_state(TASK_INTERRUPTIBLE); | |
1618 | ||
1619 | /* Check if we need to run pkt_handle_queue */ | |
1620 | if (atomic_read(&pd->scan_queue) > 0) | |
1621 | goto work_to_do; | |
1622 | ||
1623 | /* Check if we need to run the state machine for some packet */ | |
1624 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1625 | if (atomic_read(&pkt->run_sm) > 0) | |
1626 | goto work_to_do; | |
1627 | } | |
1628 | ||
1629 | /* Check if we need to process the iosched queues */ | |
1630 | if (atomic_read(&pd->iosched.attention) != 0) | |
1631 | goto work_to_do; | |
1632 | ||
1633 | /* Otherwise, go to sleep */ | |
1634 | if (PACKET_DEBUG > 1) { | |
1635 | int states[PACKET_NUM_STATES]; | |
1636 | pkt_count_states(pd, states); | |
1637 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1638 | states[0], states[1], states[2], states[3], | |
1639 | states[4], states[5]); | |
1640 | } | |
1641 | ||
1642 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1643 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1644 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1645 | min_sleep_time = pkt->sleep_time; | |
1646 | } | |
1647 | ||
1648 | generic_unplug_device(bdev_get_queue(pd->bdev)); | |
1649 | ||
1650 | VPRINTK("kcdrwd: sleeping\n"); | |
1651 | residue = schedule_timeout(min_sleep_time); | |
1652 | VPRINTK("kcdrwd: wake up\n"); | |
1653 | ||
1654 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1655 | try_to_freeze(); |
1da177e4 LT |
1656 | |
1657 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1658 | if (!pkt->sleep_time) | |
1659 | continue; | |
1660 | pkt->sleep_time -= min_sleep_time - residue; | |
1661 | if (pkt->sleep_time <= 0) { | |
1662 | pkt->sleep_time = 0; | |
1663 | atomic_inc(&pkt->run_sm); | |
1664 | } | |
1665 | } | |
1666 | ||
1667 | if (signal_pending(current)) { | |
1668 | flush_signals(current); | |
1669 | } | |
1670 | if (kthread_should_stop()) | |
1671 | break; | |
1672 | } | |
1673 | work_to_do: | |
1674 | set_current_state(TASK_RUNNING); | |
1675 | remove_wait_queue(&pd->wqueue, &wait); | |
1676 | ||
1677 | if (kthread_should_stop()) | |
1678 | break; | |
1679 | ||
1680 | /* | |
1681 | * if pkt_handle_queue returns true, we can queue | |
1682 | * another request. | |
1683 | */ | |
1684 | while (pkt_handle_queue(pd)) | |
1685 | ; | |
1686 | ||
1687 | /* | |
1688 | * Handle packet state machine | |
1689 | */ | |
1690 | pkt_handle_packets(pd); | |
1691 | ||
1692 | /* | |
1693 | * Handle iosched queues | |
1694 | */ | |
1695 | pkt_iosched_process_queue(pd); | |
1696 | } | |
1697 | ||
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1702 | { | |
7822082d | 1703 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
1da177e4 LT |
1704 | printk("%u blocks, ", pd->settings.size >> 2); |
1705 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); | |
1706 | } | |
1707 | ||
1708 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1709 | { | |
1710 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1711 | ||
1712 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1713 | cgc->cmd[2] = page_code | (page_control << 6); | |
1714 | cgc->cmd[7] = cgc->buflen >> 8; | |
1715 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1716 | cgc->data_direction = CGC_DATA_READ; | |
1717 | return pkt_generic_packet(pd, cgc); | |
1718 | } | |
1719 | ||
1720 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1721 | { | |
1722 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1723 | memset(cgc->buffer, 0, 2); | |
1724 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1725 | cgc->cmd[1] = 0x10; /* PF */ | |
1726 | cgc->cmd[7] = cgc->buflen >> 8; | |
1727 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1728 | cgc->data_direction = CGC_DATA_WRITE; | |
1729 | return pkt_generic_packet(pd, cgc); | |
1730 | } | |
1731 | ||
1732 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1733 | { | |
1734 | struct packet_command cgc; | |
1735 | int ret; | |
1736 | ||
1737 | /* set up command and get the disc info */ | |
1738 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1739 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1740 | cgc.cmd[8] = cgc.buflen = 2; | |
1741 | cgc.quiet = 1; | |
1742 | ||
1743 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1744 | return ret; | |
1745 | ||
1746 | /* not all drives have the same disc_info length, so requeue | |
1747 | * packet with the length the drive tells us it can supply | |
1748 | */ | |
1749 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1750 | sizeof(di->disc_information_length); | |
1751 | ||
1752 | if (cgc.buflen > sizeof(disc_information)) | |
1753 | cgc.buflen = sizeof(disc_information); | |
1754 | ||
1755 | cgc.cmd[8] = cgc.buflen; | |
1756 | return pkt_generic_packet(pd, &cgc); | |
1757 | } | |
1758 | ||
1759 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1760 | { | |
1761 | struct packet_command cgc; | |
1762 | int ret; | |
1763 | ||
1764 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1765 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1766 | cgc.cmd[1] = type & 3; | |
1767 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1768 | cgc.cmd[5] = track & 0xff; | |
1769 | cgc.cmd[8] = 8; | |
1770 | cgc.quiet = 1; | |
1771 | ||
1772 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1773 | return ret; | |
1774 | ||
1775 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1776 | sizeof(ti->track_information_length); | |
1777 | ||
1778 | if (cgc.buflen > sizeof(track_information)) | |
1779 | cgc.buflen = sizeof(track_information); | |
1780 | ||
1781 | cgc.cmd[8] = cgc.buflen; | |
1782 | return pkt_generic_packet(pd, &cgc); | |
1783 | } | |
1784 | ||
1785 | static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written) | |
1786 | { | |
1787 | disc_information di; | |
1788 | track_information ti; | |
1789 | __u32 last_track; | |
1790 | int ret = -1; | |
1791 | ||
1792 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1793 | return ret; | |
1794 | ||
1795 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1796 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1797 | return ret; | |
1798 | ||
1799 | /* if this track is blank, try the previous. */ | |
1800 | if (ti.blank) { | |
1801 | last_track--; | |
1802 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1803 | return ret; | |
1804 | } | |
1805 | ||
1806 | /* if last recorded field is valid, return it. */ | |
1807 | if (ti.lra_v) { | |
1808 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1809 | } else { | |
1810 | /* make it up instead */ | |
1811 | *last_written = be32_to_cpu(ti.track_start) + | |
1812 | be32_to_cpu(ti.track_size); | |
1813 | if (ti.free_blocks) | |
1814 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1815 | } | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * write mode select package based on pd->settings | |
1821 | */ | |
1822 | static int pkt_set_write_settings(struct pktcdvd_device *pd) | |
1823 | { | |
1824 | struct packet_command cgc; | |
1825 | struct request_sense sense; | |
1826 | write_param_page *wp; | |
1827 | char buffer[128]; | |
1828 | int ret, size; | |
1829 | ||
1830 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1831 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1832 | return 0; | |
1833 | ||
1834 | memset(buffer, 0, sizeof(buffer)); | |
1835 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1836 | cgc.sense = &sense; | |
1837 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1838 | pkt_dump_sense(&cgc); | |
1839 | return ret; | |
1840 | } | |
1841 | ||
1842 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1843 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1844 | if (size > sizeof(buffer)) | |
1845 | size = sizeof(buffer); | |
1846 | ||
1847 | /* | |
1848 | * now get it all | |
1849 | */ | |
1850 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1851 | cgc.sense = &sense; | |
1852 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1853 | pkt_dump_sense(&cgc); | |
1854 | return ret; | |
1855 | } | |
1856 | ||
1857 | /* | |
1858 | * write page is offset header + block descriptor length | |
1859 | */ | |
1860 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1861 | ||
1862 | wp->fp = pd->settings.fp; | |
1863 | wp->track_mode = pd->settings.track_mode; | |
1864 | wp->write_type = pd->settings.write_type; | |
1865 | wp->data_block_type = pd->settings.block_mode; | |
1866 | ||
1867 | wp->multi_session = 0; | |
1868 | ||
1869 | #ifdef PACKET_USE_LS | |
1870 | wp->link_size = 7; | |
1871 | wp->ls_v = 1; | |
1872 | #endif | |
1873 | ||
1874 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1875 | wp->session_format = 0; | |
1876 | wp->subhdr2 = 0x20; | |
1877 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1878 | wp->session_format = 0x20; | |
1879 | wp->subhdr2 = 8; | |
1880 | #if 0 | |
1881 | wp->mcn[0] = 0x80; | |
1882 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1883 | #endif | |
1884 | } else { | |
1885 | /* | |
1886 | * paranoia | |
1887 | */ | |
7822082d | 1888 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1889 | return 1; |
1890 | } | |
1891 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1892 | ||
1893 | cgc.buflen = cgc.cmd[8] = size; | |
1894 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1895 | pkt_dump_sense(&cgc); | |
1896 | return ret; | |
1897 | } | |
1898 | ||
1899 | pkt_print_settings(pd); | |
1900 | return 0; | |
1901 | } | |
1902 | ||
1903 | /* | |
7c613d59 | 1904 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1905 | */ |
ab863ec3 | 1906 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1907 | { |
ab863ec3 PO |
1908 | switch (pd->mmc3_profile) { |
1909 | case 0x1a: /* DVD+RW */ | |
1910 | case 0x12: /* DVD-RAM */ | |
1911 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1912 | return 1; | |
1913 | default: | |
1914 | break; | |
1915 | } | |
1da177e4 | 1916 | |
ab863ec3 PO |
1917 | if (!ti->packet || !ti->fp) |
1918 | return 0; | |
1da177e4 LT |
1919 | |
1920 | /* | |
1921 | * "good" settings as per Mt Fuji. | |
1922 | */ | |
ab863ec3 | 1923 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1924 | return 1; |
1da177e4 | 1925 | |
ab863ec3 | 1926 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1927 | return 1; |
1da177e4 | 1928 | |
ab863ec3 | 1929 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1930 | return 1; |
1da177e4 | 1931 | |
7822082d | 1932 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1933 | return 0; |
1da177e4 LT |
1934 | } |
1935 | ||
1936 | /* | |
7c613d59 | 1937 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1938 | */ |
7c613d59 | 1939 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1940 | { |
1941 | switch (pd->mmc3_profile) { | |
1942 | case 0x0a: /* CD-RW */ | |
1943 | case 0xffff: /* MMC3 not supported */ | |
1944 | break; | |
1945 | case 0x1a: /* DVD+RW */ | |
1946 | case 0x13: /* DVD-RW */ | |
1947 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1948 | return 1; |
1da177e4 | 1949 | default: |
7822082d | 1950 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); |
7c613d59 | 1951 | return 0; |
1da177e4 LT |
1952 | } |
1953 | ||
1954 | /* | |
1955 | * for disc type 0xff we should probably reserve a new track. | |
1956 | * but i'm not sure, should we leave this to user apps? probably. | |
1957 | */ | |
1958 | if (di->disc_type == 0xff) { | |
7822082d | 1959 | printk(DRIVER_NAME": Unknown disc. No track?\n"); |
7c613d59 | 1960 | return 0; |
1da177e4 LT |
1961 | } |
1962 | ||
1963 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
7822082d | 1964 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1965 | return 0; |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | if (di->erasable == 0) { | |
7822082d | 1969 | printk(DRIVER_NAME": Disc not erasable\n"); |
7c613d59 | 1970 | return 0; |
1da177e4 LT |
1971 | } |
1972 | ||
1973 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
7822082d | 1974 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); |
7c613d59 | 1975 | return 0; |
1da177e4 LT |
1976 | } |
1977 | ||
7c613d59 | 1978 | return 1; |
1da177e4 LT |
1979 | } |
1980 | ||
1981 | static int pkt_probe_settings(struct pktcdvd_device *pd) | |
1982 | { | |
1983 | struct packet_command cgc; | |
1984 | unsigned char buf[12]; | |
1985 | disc_information di; | |
1986 | track_information ti; | |
1987 | int ret, track; | |
1988 | ||
1989 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1990 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1991 | cgc.cmd[8] = 8; | |
1992 | ret = pkt_generic_packet(pd, &cgc); | |
1993 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1994 | ||
1995 | memset(&di, 0, sizeof(disc_information)); | |
1996 | memset(&ti, 0, sizeof(track_information)); | |
1997 | ||
1998 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
1999 | printk("failed get_disc\n"); | |
2000 | return ret; | |
2001 | } | |
2002 | ||
7c613d59 | 2003 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 2004 | return -EROFS; |
1da177e4 | 2005 | |
1da177e4 LT |
2006 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
2007 | ||
2008 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
2009 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
7822082d | 2010 | printk(DRIVER_NAME": failed get_track\n"); |
1da177e4 LT |
2011 | return ret; |
2012 | } | |
2013 | ||
ab863ec3 | 2014 | if (!pkt_writable_track(pd, &ti)) { |
7822082d | 2015 | printk(DRIVER_NAME": can't write to this track\n"); |
9db91546 | 2016 | return -EROFS; |
1da177e4 LT |
2017 | } |
2018 | ||
2019 | /* | |
2020 | * we keep packet size in 512 byte units, makes it easier to | |
2021 | * deal with request calculations. | |
2022 | */ | |
2023 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
2024 | if (pd->settings.size == 0) { | |
7822082d | 2025 | printk(DRIVER_NAME": detected zero packet size!\n"); |
a460ad62 | 2026 | return -ENXIO; |
1da177e4 | 2027 | } |
d0272e78 | 2028 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
7822082d | 2029 | printk(DRIVER_NAME": packet size is too big\n"); |
9db91546 | 2030 | return -EROFS; |
d0272e78 | 2031 | } |
1da177e4 LT |
2032 | pd->settings.fp = ti.fp; |
2033 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
2034 | ||
2035 | if (ti.nwa_v) { | |
2036 | pd->nwa = be32_to_cpu(ti.next_writable); | |
2037 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
2038 | } | |
2039 | ||
2040 | /* | |
2041 | * in theory we could use lra on -RW media as well and just zero | |
2042 | * blocks that haven't been written yet, but in practice that | |
2043 | * is just a no-go. we'll use that for -R, naturally. | |
2044 | */ | |
2045 | if (ti.lra_v) { | |
2046 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
2047 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2048 | } else { | |
2049 | pd->lra = 0xffffffff; | |
2050 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * fine for now | |
2055 | */ | |
2056 | pd->settings.link_loss = 7; | |
2057 | pd->settings.write_type = 0; /* packet */ | |
2058 | pd->settings.track_mode = ti.track_mode; | |
2059 | ||
2060 | /* | |
2061 | * mode1 or mode2 disc | |
2062 | */ | |
2063 | switch (ti.data_mode) { | |
2064 | case PACKET_MODE1: | |
2065 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
2066 | break; | |
2067 | case PACKET_MODE2: | |
2068 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
2069 | break; | |
2070 | default: | |
7822082d | 2071 | printk(DRIVER_NAME": unknown data mode\n"); |
9db91546 | 2072 | return -EROFS; |
1da177e4 LT |
2073 | } |
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | /* | |
2078 | * enable/disable write caching on drive | |
2079 | */ | |
2080 | static int pkt_write_caching(struct pktcdvd_device *pd, int set) | |
2081 | { | |
2082 | struct packet_command cgc; | |
2083 | struct request_sense sense; | |
2084 | unsigned char buf[64]; | |
2085 | int ret; | |
2086 | ||
2087 | memset(buf, 0, sizeof(buf)); | |
2088 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
2089 | cgc.sense = &sense; | |
2090 | cgc.buflen = pd->mode_offset + 12; | |
2091 | ||
2092 | /* | |
2093 | * caching mode page might not be there, so quiet this command | |
2094 | */ | |
2095 | cgc.quiet = 1; | |
2096 | ||
2097 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
2098 | return ret; | |
2099 | ||
2100 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
2101 | ||
2102 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
2103 | ret = pkt_mode_select(pd, &cgc); | |
2104 | if (ret) { | |
7822082d | 2105 | printk(DRIVER_NAME": write caching control failed\n"); |
1da177e4 LT |
2106 | pkt_dump_sense(&cgc); |
2107 | } else if (!ret && set) | |
7822082d | 2108 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); |
1da177e4 LT |
2109 | return ret; |
2110 | } | |
2111 | ||
2112 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
2113 | { | |
2114 | struct packet_command cgc; | |
2115 | ||
2116 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2117 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
2118 | cgc.cmd[4] = lockflag ? 1 : 0; | |
2119 | return pkt_generic_packet(pd, &cgc); | |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * Returns drive maximum write speed | |
2124 | */ | |
2125 | static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed) | |
2126 | { | |
2127 | struct packet_command cgc; | |
2128 | struct request_sense sense; | |
2129 | unsigned char buf[256+18]; | |
2130 | unsigned char *cap_buf; | |
2131 | int ret, offset; | |
2132 | ||
2133 | memset(buf, 0, sizeof(buf)); | |
2134 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; | |
2135 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
2136 | cgc.sense = &sense; | |
2137 | ||
2138 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2139 | if (ret) { | |
2140 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
2141 | sizeof(struct mode_page_header); | |
2142 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2143 | if (ret) { | |
2144 | pkt_dump_sense(&cgc); | |
2145 | return ret; | |
2146 | } | |
2147 | } | |
2148 | ||
2149 | offset = 20; /* Obsoleted field, used by older drives */ | |
2150 | if (cap_buf[1] >= 28) | |
2151 | offset = 28; /* Current write speed selected */ | |
2152 | if (cap_buf[1] >= 30) { | |
2153 | /* If the drive reports at least one "Logical Unit Write | |
2154 | * Speed Performance Descriptor Block", use the information | |
2155 | * in the first block. (contains the highest speed) | |
2156 | */ | |
2157 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2158 | if (num_spdb > 0) | |
2159 | offset = 34; | |
2160 | } | |
2161 | ||
2162 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2163 | return 0; | |
2164 | } | |
2165 | ||
2166 | /* These tables from cdrecord - I don't have orange book */ | |
2167 | /* standard speed CD-RW (1-4x) */ | |
2168 | static char clv_to_speed[16] = { | |
2169 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2170 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2171 | }; | |
2172 | /* high speed CD-RW (-10x) */ | |
2173 | static char hs_clv_to_speed[16] = { | |
2174 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2175 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2176 | }; | |
2177 | /* ultra high speed CD-RW */ | |
2178 | static char us_clv_to_speed[16] = { | |
2179 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2180 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2181 | }; | |
2182 | ||
2183 | /* | |
2184 | * reads the maximum media speed from ATIP | |
2185 | */ | |
2186 | static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed) | |
2187 | { | |
2188 | struct packet_command cgc; | |
2189 | struct request_sense sense; | |
2190 | unsigned char buf[64]; | |
2191 | unsigned int size, st, sp; | |
2192 | int ret; | |
2193 | ||
2194 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2195 | cgc.sense = &sense; | |
2196 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2197 | cgc.cmd[1] = 2; | |
2198 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2199 | cgc.cmd[8] = 2; | |
2200 | ret = pkt_generic_packet(pd, &cgc); | |
2201 | if (ret) { | |
2202 | pkt_dump_sense(&cgc); | |
2203 | return ret; | |
2204 | } | |
2205 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2206 | if (size > sizeof(buf)) | |
2207 | size = sizeof(buf); | |
2208 | ||
2209 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2210 | cgc.sense = &sense; | |
2211 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2212 | cgc.cmd[1] = 2; | |
2213 | cgc.cmd[2] = 4; | |
2214 | cgc.cmd[8] = size; | |
2215 | ret = pkt_generic_packet(pd, &cgc); | |
2216 | if (ret) { | |
2217 | pkt_dump_sense(&cgc); | |
2218 | return ret; | |
2219 | } | |
2220 | ||
2221 | if (!buf[6] & 0x40) { | |
7822082d | 2222 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); |
1da177e4 LT |
2223 | return 1; |
2224 | } | |
2225 | if (!buf[6] & 0x4) { | |
7822082d | 2226 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2227 | return 1; |
2228 | } | |
2229 | ||
2230 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2231 | ||
2232 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2233 | ||
2234 | /* Info from cdrecord */ | |
2235 | switch (st) { | |
2236 | case 0: /* standard speed */ | |
2237 | *speed = clv_to_speed[sp]; | |
2238 | break; | |
2239 | case 1: /* high speed */ | |
2240 | *speed = hs_clv_to_speed[sp]; | |
2241 | break; | |
2242 | case 2: /* ultra high speed */ | |
2243 | *speed = us_clv_to_speed[sp]; | |
2244 | break; | |
2245 | default: | |
7822082d | 2246 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); |
1da177e4 LT |
2247 | return 1; |
2248 | } | |
2249 | if (*speed) { | |
7822082d | 2250 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); |
1da177e4 LT |
2251 | return 0; |
2252 | } else { | |
7822082d | 2253 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); |
1da177e4 LT |
2254 | return 1; |
2255 | } | |
2256 | } | |
2257 | ||
2258 | static int pkt_perform_opc(struct pktcdvd_device *pd) | |
2259 | { | |
2260 | struct packet_command cgc; | |
2261 | struct request_sense sense; | |
2262 | int ret; | |
2263 | ||
7822082d | 2264 | VPRINTK(DRIVER_NAME": Performing OPC\n"); |
1da177e4 LT |
2265 | |
2266 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2267 | cgc.sense = &sense; | |
2268 | cgc.timeout = 60*HZ; | |
2269 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2270 | cgc.cmd[1] = 1; | |
2271 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
2272 | pkt_dump_sense(&cgc); | |
2273 | return ret; | |
2274 | } | |
2275 | ||
2276 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2277 | { | |
2278 | int ret; | |
2279 | unsigned int write_speed, media_write_speed, read_speed; | |
2280 | ||
2281 | if ((ret = pkt_probe_settings(pd))) { | |
7822082d | 2282 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); |
9db91546 | 2283 | return ret; |
1da177e4 LT |
2284 | } |
2285 | ||
2286 | if ((ret = pkt_set_write_settings(pd))) { | |
7822082d | 2287 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); |
1da177e4 LT |
2288 | return -EIO; |
2289 | } | |
2290 | ||
2291 | pkt_write_caching(pd, USE_WCACHING); | |
2292 | ||
2293 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2294 | write_speed = 16 * 177; | |
2295 | switch (pd->mmc3_profile) { | |
2296 | case 0x13: /* DVD-RW */ | |
2297 | case 0x1a: /* DVD+RW */ | |
2298 | case 0x12: /* DVD-RAM */ | |
7822082d | 2299 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2300 | break; |
2301 | default: | |
2302 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2303 | media_write_speed = 16; | |
2304 | write_speed = min(write_speed, media_write_speed * 177); | |
7822082d | 2305 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2306 | break; |
2307 | } | |
2308 | read_speed = write_speed; | |
2309 | ||
2310 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
7822082d | 2311 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); |
1da177e4 LT |
2312 | return -EIO; |
2313 | } | |
2314 | pd->write_speed = write_speed; | |
2315 | pd->read_speed = read_speed; | |
2316 | ||
2317 | if ((ret = pkt_perform_opc(pd))) { | |
7822082d | 2318 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); |
1da177e4 LT |
2319 | } |
2320 | ||
2321 | return 0; | |
2322 | } | |
2323 | ||
2324 | /* | |
2325 | * called at open time. | |
2326 | */ | |
2327 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) | |
2328 | { | |
2329 | int ret; | |
2330 | long lba; | |
2331 | request_queue_t *q; | |
2332 | ||
2333 | /* | |
2334 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2335 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2336 | * so bdget() can't fail. | |
2337 | */ | |
2338 | bdget(pd->bdev->bd_dev); | |
2339 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) | |
2340 | goto out; | |
2341 | ||
8382bf2e PO |
2342 | if ((ret = bd_claim(pd->bdev, pd))) |
2343 | goto out_putdev; | |
2344 | ||
1da177e4 | 2345 | if ((ret = pkt_get_last_written(pd, &lba))) { |
7822082d | 2346 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); |
8382bf2e | 2347 | goto out_unclaim; |
1da177e4 LT |
2348 | } |
2349 | ||
2350 | set_capacity(pd->disk, lba << 2); | |
2351 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2352 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2353 | ||
2354 | q = bdev_get_queue(pd->bdev); | |
2355 | if (write) { | |
2356 | if ((ret = pkt_open_write(pd))) | |
8382bf2e | 2357 | goto out_unclaim; |
1da177e4 LT |
2358 | /* |
2359 | * Some CDRW drives can not handle writes larger than one packet, | |
2360 | * even if the size is a multiple of the packet size. | |
2361 | */ | |
2362 | spin_lock_irq(q->queue_lock); | |
2363 | blk_queue_max_sectors(q, pd->settings.size); | |
2364 | spin_unlock_irq(q->queue_lock); | |
2365 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2366 | } else { | |
2367 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2368 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2369 | } | |
2370 | ||
2371 | if ((ret = pkt_set_segment_merging(pd, q))) | |
8382bf2e | 2372 | goto out_unclaim; |
1da177e4 | 2373 | |
e1bc89bc PO |
2374 | if (write) { |
2375 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
7822082d | 2376 | printk(DRIVER_NAME": not enough memory for buffers\n"); |
e1bc89bc PO |
2377 | ret = -ENOMEM; |
2378 | goto out_unclaim; | |
2379 | } | |
7822082d | 2380 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); |
e1bc89bc | 2381 | } |
1da177e4 LT |
2382 | |
2383 | return 0; | |
2384 | ||
8382bf2e PO |
2385 | out_unclaim: |
2386 | bd_release(pd->bdev); | |
1da177e4 LT |
2387 | out_putdev: |
2388 | blkdev_put(pd->bdev); | |
2389 | out: | |
2390 | return ret; | |
2391 | } | |
2392 | ||
2393 | /* | |
2394 | * called when the device is closed. makes sure that the device flushes | |
2395 | * the internal cache before we close. | |
2396 | */ | |
2397 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2398 | { | |
2399 | if (flush && pkt_flush_cache(pd)) | |
7822082d | 2400 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); |
1da177e4 LT |
2401 | |
2402 | pkt_lock_door(pd, 0); | |
2403 | ||
2404 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
8382bf2e | 2405 | bd_release(pd->bdev); |
1da177e4 | 2406 | blkdev_put(pd->bdev); |
e1bc89bc PO |
2407 | |
2408 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2409 | } |
2410 | ||
2411 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) | |
2412 | { | |
2413 | if (dev_minor >= MAX_WRITERS) | |
2414 | return NULL; | |
2415 | return pkt_devs[dev_minor]; | |
2416 | } | |
2417 | ||
2418 | static int pkt_open(struct inode *inode, struct file *file) | |
2419 | { | |
2420 | struct pktcdvd_device *pd = NULL; | |
2421 | int ret; | |
2422 | ||
7822082d | 2423 | VPRINTK(DRIVER_NAME": entering open\n"); |
1da177e4 | 2424 | |
1657f824 | 2425 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2426 | pd = pkt_find_dev_from_minor(iminor(inode)); |
2427 | if (!pd) { | |
2428 | ret = -ENODEV; | |
2429 | goto out; | |
2430 | } | |
2431 | BUG_ON(pd->refcnt < 0); | |
2432 | ||
2433 | pd->refcnt++; | |
46f4e1b7 PO |
2434 | if (pd->refcnt > 1) { |
2435 | if ((file->f_mode & FMODE_WRITE) && | |
2436 | !test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2437 | ret = -EBUSY; | |
2438 | goto out_dec; | |
2439 | } | |
2440 | } else { | |
01fd9fda PO |
2441 | ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE); |
2442 | if (ret) | |
1da177e4 | 2443 | goto out_dec; |
1da177e4 LT |
2444 | /* |
2445 | * needed here as well, since ext2 (among others) may change | |
2446 | * the blocksize at mount time | |
2447 | */ | |
2448 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); | |
2449 | } | |
2450 | ||
1657f824 | 2451 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2452 | return 0; |
2453 | ||
2454 | out_dec: | |
2455 | pd->refcnt--; | |
2456 | out: | |
7822082d | 2457 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); |
1657f824 | 2458 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2459 | return ret; |
2460 | } | |
2461 | ||
2462 | static int pkt_close(struct inode *inode, struct file *file) | |
2463 | { | |
2464 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2465 | int ret = 0; | |
2466 | ||
1657f824 | 2467 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2468 | pd->refcnt--; |
2469 | BUG_ON(pd->refcnt < 0); | |
2470 | if (pd->refcnt == 0) { | |
2471 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2472 | pkt_release_dev(pd, flush); | |
2473 | } | |
1657f824 | 2474 | mutex_unlock(&ctl_mutex); |
1da177e4 LT |
2475 | return ret; |
2476 | } | |
2477 | ||
2478 | ||
1da177e4 LT |
2479 | static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err) |
2480 | { | |
2481 | struct packet_stacked_data *psd = bio->bi_private; | |
2482 | struct pktcdvd_device *pd = psd->pd; | |
2483 | ||
2484 | if (bio->bi_size) | |
2485 | return 1; | |
2486 | ||
2487 | bio_put(bio); | |
2488 | bio_endio(psd->bio, psd->bio->bi_size, err); | |
2489 | mempool_free(psd, psd_pool); | |
2490 | pkt_bio_finished(pd); | |
2491 | return 0; | |
2492 | } | |
2493 | ||
2494 | static int pkt_make_request(request_queue_t *q, struct bio *bio) | |
2495 | { | |
2496 | struct pktcdvd_device *pd; | |
2497 | char b[BDEVNAME_SIZE]; | |
2498 | sector_t zone; | |
2499 | struct packet_data *pkt; | |
2500 | int was_empty, blocked_bio; | |
2501 | struct pkt_rb_node *node; | |
2502 | ||
2503 | pd = q->queuedata; | |
2504 | if (!pd) { | |
7822082d | 2505 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
1da177e4 LT |
2506 | goto end_io; |
2507 | } | |
2508 | ||
2509 | /* | |
2510 | * Clone READ bios so we can have our own bi_end_io callback. | |
2511 | */ | |
2512 | if (bio_data_dir(bio) == READ) { | |
2513 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2514 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2515 | ||
2516 | psd->pd = pd; | |
2517 | psd->bio = bio; | |
2518 | cloned_bio->bi_bdev = pd->bdev; | |
2519 | cloned_bio->bi_private = psd; | |
2520 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2521 | pd->stats.secs_r += bio->bi_size >> 9; | |
46c271be | 2522 | pkt_queue_bio(pd, cloned_bio); |
1da177e4 LT |
2523 | return 0; |
2524 | } | |
2525 | ||
2526 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
7822082d | 2527 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", |
1da177e4 LT |
2528 | pd->name, (unsigned long long)bio->bi_sector); |
2529 | goto end_io; | |
2530 | } | |
2531 | ||
2532 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
7822082d | 2533 | printk(DRIVER_NAME": wrong bio size\n"); |
1da177e4 LT |
2534 | goto end_io; |
2535 | } | |
2536 | ||
2537 | blk_queue_bounce(q, &bio); | |
2538 | ||
2539 | zone = ZONE(bio->bi_sector, pd); | |
2540 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", | |
2541 | (unsigned long long)bio->bi_sector, | |
2542 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); | |
2543 | ||
2544 | /* Check if we have to split the bio */ | |
2545 | { | |
2546 | struct bio_pair *bp; | |
2547 | sector_t last_zone; | |
2548 | int first_sectors; | |
2549 | ||
2550 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); | |
2551 | if (last_zone != zone) { | |
2552 | BUG_ON(last_zone != zone + pd->settings.size); | |
2553 | first_sectors = last_zone - bio->bi_sector; | |
2554 | bp = bio_split(bio, bio_split_pool, first_sectors); | |
2555 | BUG_ON(!bp); | |
2556 | pkt_make_request(q, &bp->bio1); | |
2557 | pkt_make_request(q, &bp->bio2); | |
2558 | bio_pair_release(bp); | |
2559 | return 0; | |
2560 | } | |
2561 | } | |
2562 | ||
2563 | /* | |
2564 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2565 | * just append this bio to that packet. | |
2566 | */ | |
2567 | spin_lock(&pd->cdrw.active_list_lock); | |
2568 | blocked_bio = 0; | |
2569 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2570 | if (pkt->sector == zone) { | |
2571 | spin_lock(&pkt->lock); | |
2572 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2573 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
2574 | pkt_add_list_last(bio, &pkt->orig_bios, | |
2575 | &pkt->orig_bios_tail); | |
2576 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
2577 | if ((pkt->write_size >= pkt->frames) && | |
2578 | (pkt->state == PACKET_WAITING_STATE)) { | |
2579 | atomic_inc(&pkt->run_sm); | |
2580 | wake_up(&pd->wqueue); | |
2581 | } | |
2582 | spin_unlock(&pkt->lock); | |
2583 | spin_unlock(&pd->cdrw.active_list_lock); | |
2584 | return 0; | |
2585 | } else { | |
2586 | blocked_bio = 1; | |
2587 | } | |
2588 | spin_unlock(&pkt->lock); | |
2589 | } | |
2590 | } | |
2591 | spin_unlock(&pd->cdrw.active_list_lock); | |
2592 | ||
0a0fc960 TM |
2593 | /* |
2594 | * Test if there is enough room left in the bio work queue | |
2595 | * (queue size >= congestion on mark). | |
2596 | * If not, wait till the work queue size is below the congestion off mark. | |
2597 | */ | |
2598 | spin_lock(&pd->lock); | |
2599 | if (pd->write_congestion_on > 0 | |
2600 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
2601 | blk_set_queue_congested(q, WRITE); | |
2602 | do { | |
2603 | spin_unlock(&pd->lock); | |
2604 | congestion_wait(WRITE, HZ); | |
2605 | spin_lock(&pd->lock); | |
2606 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2607 | } | |
2608 | spin_unlock(&pd->lock); | |
2609 | ||
1da177e4 LT |
2610 | /* |
2611 | * No matching packet found. Store the bio in the work queue. | |
2612 | */ | |
2613 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2614 | node->bio = bio; |
2615 | spin_lock(&pd->lock); | |
2616 | BUG_ON(pd->bio_queue_size < 0); | |
2617 | was_empty = (pd->bio_queue_size == 0); | |
2618 | pkt_rbtree_insert(pd, node); | |
2619 | spin_unlock(&pd->lock); | |
2620 | ||
2621 | /* | |
2622 | * Wake up the worker thread. | |
2623 | */ | |
2624 | atomic_set(&pd->scan_queue, 1); | |
2625 | if (was_empty) { | |
2626 | /* This wake_up is required for correct operation */ | |
2627 | wake_up(&pd->wqueue); | |
2628 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2629 | /* | |
2630 | * This wake up is not required for correct operation, | |
2631 | * but improves performance in some cases. | |
2632 | */ | |
2633 | wake_up(&pd->wqueue); | |
2634 | } | |
2635 | return 0; | |
2636 | end_io: | |
2637 | bio_io_error(bio, bio->bi_size); | |
2638 | return 0; | |
2639 | } | |
2640 | ||
2641 | ||
2642 | ||
2643 | static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec) | |
2644 | { | |
2645 | struct pktcdvd_device *pd = q->queuedata; | |
2646 | sector_t zone = ZONE(bio->bi_sector, pd); | |
2647 | int used = ((bio->bi_sector - zone) << 9) + bio->bi_size; | |
2648 | int remaining = (pd->settings.size << 9) - used; | |
2649 | int remaining2; | |
2650 | ||
2651 | /* | |
2652 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2653 | * boundary, pkt_make_request() will split the bio. | |
2654 | */ | |
2655 | remaining2 = PAGE_SIZE - bio->bi_size; | |
2656 | remaining = max(remaining, remaining2); | |
2657 | ||
2658 | BUG_ON(remaining < 0); | |
2659 | return remaining; | |
2660 | } | |
2661 | ||
2662 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2663 | { | |
2664 | request_queue_t *q = pd->disk->queue; | |
2665 | ||
2666 | blk_queue_make_request(q, pkt_make_request); | |
2667 | blk_queue_hardsect_size(q, CD_FRAMESIZE); | |
2668 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); | |
2669 | blk_queue_merge_bvec(q, pkt_merge_bvec); | |
2670 | q->queuedata = pd; | |
2671 | } | |
2672 | ||
2673 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2674 | { | |
2675 | struct pktcdvd_device *pd = m->private; | |
2676 | char *msg; | |
2677 | char bdev_buf[BDEVNAME_SIZE]; | |
2678 | int states[PACKET_NUM_STATES]; | |
2679 | ||
2680 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2681 | bdevname(pd->bdev, bdev_buf)); | |
2682 | ||
2683 | seq_printf(m, "\nSettings:\n"); | |
2684 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2685 | ||
2686 | if (pd->settings.write_type == 0) | |
2687 | msg = "Packet"; | |
2688 | else | |
2689 | msg = "Unknown"; | |
2690 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2691 | ||
2692 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2693 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2694 | ||
2695 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2696 | ||
2697 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2698 | msg = "Mode 1"; | |
2699 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2700 | msg = "Mode 2"; | |
2701 | else | |
2702 | msg = "Unknown"; | |
2703 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2704 | ||
2705 | seq_printf(m, "\nStatistics:\n"); | |
2706 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2707 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2708 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2709 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2710 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2711 | ||
2712 | seq_printf(m, "\nMisc:\n"); | |
2713 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2714 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2715 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2716 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2717 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2718 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2719 | ||
2720 | seq_printf(m, "\nQueue state:\n"); | |
2721 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2722 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2723 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2724 | ||
2725 | pkt_count_states(pd, states); | |
2726 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2727 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2728 | ||
0a0fc960 TM |
2729 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2730 | pd->write_congestion_off, | |
2731 | pd->write_congestion_on); | |
1da177e4 LT |
2732 | return 0; |
2733 | } | |
2734 | ||
2735 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2736 | { | |
2737 | return single_open(file, pkt_seq_show, PDE(inode)->data); | |
2738 | } | |
2739 | ||
2740 | static struct file_operations pkt_proc_fops = { | |
2741 | .open = pkt_seq_open, | |
2742 | .read = seq_read, | |
2743 | .llseek = seq_lseek, | |
2744 | .release = single_release | |
2745 | }; | |
2746 | ||
2747 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2748 | { | |
2749 | int i; | |
2750 | int ret = 0; | |
2751 | char b[BDEVNAME_SIZE]; | |
2752 | struct proc_dir_entry *proc; | |
2753 | struct block_device *bdev; | |
2754 | ||
2755 | if (pd->pkt_dev == dev) { | |
7822082d | 2756 | printk(DRIVER_NAME": Recursive setup not allowed\n"); |
1da177e4 LT |
2757 | return -EBUSY; |
2758 | } | |
2759 | for (i = 0; i < MAX_WRITERS; i++) { | |
2760 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2761 | if (!pd2) | |
2762 | continue; | |
2763 | if (pd2->bdev->bd_dev == dev) { | |
7822082d | 2764 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); |
1da177e4 LT |
2765 | return -EBUSY; |
2766 | } | |
2767 | if (pd2->pkt_dev == dev) { | |
7822082d | 2768 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); |
1da177e4 LT |
2769 | return -EBUSY; |
2770 | } | |
2771 | } | |
2772 | ||
2773 | bdev = bdget(dev); | |
2774 | if (!bdev) | |
2775 | return -ENOMEM; | |
2776 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); | |
2777 | if (ret) | |
2778 | return ret; | |
2779 | ||
2780 | /* This is safe, since we have a reference from open(). */ | |
2781 | __module_get(THIS_MODULE); | |
2782 | ||
1da177e4 LT |
2783 | pd->bdev = bdev; |
2784 | set_blocksize(bdev, CD_FRAMESIZE); | |
2785 | ||
2786 | pkt_init_queue(pd); | |
2787 | ||
2788 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2789 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2790 | if (IS_ERR(pd->cdrw.thread)) { | |
7822082d | 2791 | printk(DRIVER_NAME": can't start kernel thread\n"); |
1da177e4 | 2792 | ret = -ENOMEM; |
e1bc89bc | 2793 | goto out_mem; |
1da177e4 LT |
2794 | } |
2795 | ||
2796 | proc = create_proc_entry(pd->name, 0, pkt_proc); | |
2797 | if (proc) { | |
2798 | proc->data = pd; | |
2799 | proc->proc_fops = &pkt_proc_fops; | |
2800 | } | |
7822082d | 2801 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
1da177e4 LT |
2802 | return 0; |
2803 | ||
1da177e4 LT |
2804 | out_mem: |
2805 | blkdev_put(bdev); | |
2806 | /* This is safe: open() is still holding a reference. */ | |
2807 | module_put(THIS_MODULE); | |
2808 | return ret; | |
2809 | } | |
2810 | ||
2811 | static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
2812 | { | |
2813 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2814 | ||
2815 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); | |
1da177e4 LT |
2816 | |
2817 | switch (cmd) { | |
2818 | /* | |
2819 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2820 | */ | |
2821 | case CDROMMULTISESSION: | |
2822 | case CDROMREADTOCENTRY: | |
2823 | case CDROM_LAST_WRITTEN: | |
2824 | case CDROM_SEND_PACKET: | |
2825 | case SCSI_IOCTL_SEND_COMMAND: | |
118326e9 | 2826 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2827 | |
2828 | case CDROMEJECT: | |
2829 | /* | |
2830 | * The door gets locked when the device is opened, so we | |
2831 | * have to unlock it or else the eject command fails. | |
2832 | */ | |
948423e5 PO |
2833 | if (pd->refcnt == 1) |
2834 | pkt_lock_door(pd, 0); | |
118326e9 | 2835 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
1da177e4 LT |
2836 | |
2837 | default: | |
7822082d | 2838 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); |
1da177e4 LT |
2839 | return -ENOTTY; |
2840 | } | |
2841 | ||
2842 | return 0; | |
2843 | } | |
2844 | ||
2845 | static int pkt_media_changed(struct gendisk *disk) | |
2846 | { | |
2847 | struct pktcdvd_device *pd = disk->private_data; | |
2848 | struct gendisk *attached_disk; | |
2849 | ||
2850 | if (!pd) | |
2851 | return 0; | |
2852 | if (!pd->bdev) | |
2853 | return 0; | |
2854 | attached_disk = pd->bdev->bd_disk; | |
2855 | if (!attached_disk) | |
2856 | return 0; | |
2857 | return attached_disk->fops->media_changed(attached_disk); | |
2858 | } | |
2859 | ||
2860 | static struct block_device_operations pktcdvd_ops = { | |
2861 | .owner = THIS_MODULE, | |
2862 | .open = pkt_open, | |
2863 | .release = pkt_close, | |
2864 | .ioctl = pkt_ioctl, | |
2865 | .media_changed = pkt_media_changed, | |
2866 | }; | |
2867 | ||
2868 | /* | |
2869 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2870 | */ | |
adb9250a | 2871 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2872 | { |
2873 | int idx; | |
2874 | int ret = -ENOMEM; | |
2875 | struct pktcdvd_device *pd; | |
2876 | struct gendisk *disk; | |
adb9250a TM |
2877 | |
2878 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2879 | |
2880 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2881 | if (!pkt_devs[idx]) | |
2882 | break; | |
2883 | if (idx == MAX_WRITERS) { | |
7822082d | 2884 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2885 | ret = -EBUSY; |
2886 | goto out_mutex; | |
1da177e4 LT |
2887 | } |
2888 | ||
1107d2e0 | 2889 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2890 | if (!pd) |
adb9250a | 2891 | goto out_mutex; |
1da177e4 | 2892 | |
0eaae62a MD |
2893 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2894 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2895 | if (!pd->rb_pool) |
2896 | goto out_mem; | |
2897 | ||
e1bc89bc PO |
2898 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2899 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2900 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2901 | ||
1da177e4 LT |
2902 | spin_lock_init(&pd->lock); |
2903 | spin_lock_init(&pd->iosched.lock); | |
7822082d | 2904 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2905 | init_waitqueue_head(&pd->wqueue); |
2906 | pd->bio_queue = RB_ROOT; | |
2907 | ||
0a0fc960 TM |
2908 | pd->write_congestion_on = write_congestion_on; |
2909 | pd->write_congestion_off = write_congestion_off; | |
2910 | ||
adb9250a TM |
2911 | disk = alloc_disk(1); |
2912 | if (!disk) | |
2913 | goto out_mem; | |
2914 | pd->disk = disk; | |
add21660 | 2915 | disk->major = pktdev_major; |
1da177e4 LT |
2916 | disk->first_minor = idx; |
2917 | disk->fops = &pktcdvd_ops; | |
2918 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2919 | strcpy(disk->disk_name, pd->name); |
1da177e4 LT |
2920 | disk->private_data = pd; |
2921 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2922 | if (!disk->queue) | |
2923 | goto out_mem2; | |
2924 | ||
2925 | pd->pkt_dev = MKDEV(disk->major, disk->first_minor); | |
2926 | ret = pkt_new_dev(pd, dev); | |
2927 | if (ret) | |
2928 | goto out_new_dev; | |
2929 | ||
2930 | add_disk(disk); | |
adb9250a | 2931 | |
32694850 TM |
2932 | pkt_sysfs_dev_new(pd); |
2933 | pkt_debugfs_dev_new(pd); | |
2934 | ||
1da177e4 | 2935 | pkt_devs[idx] = pd; |
adb9250a TM |
2936 | if (pkt_dev) |
2937 | *pkt_dev = pd->pkt_dev; | |
2938 | ||
2939 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2940 | return 0; |
2941 | ||
2942 | out_new_dev: | |
1312f40e | 2943 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2944 | out_mem2: |
2945 | put_disk(disk); | |
2946 | out_mem: | |
2947 | if (pd->rb_pool) | |
2948 | mempool_destroy(pd->rb_pool); | |
2949 | kfree(pd); | |
adb9250a TM |
2950 | out_mutex: |
2951 | mutex_unlock(&ctl_mutex); | |
2952 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); | |
1da177e4 LT |
2953 | return ret; |
2954 | } | |
2955 | ||
2956 | /* | |
2957 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2958 | */ | |
adb9250a | 2959 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2960 | { |
2961 | struct pktcdvd_device *pd; | |
2962 | int idx; | |
adb9250a TM |
2963 | int ret = 0; |
2964 | ||
2965 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2966 | |
2967 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2968 | pd = pkt_devs[idx]; | |
2969 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2970 | break; | |
2971 | } | |
2972 | if (idx == MAX_WRITERS) { | |
7822082d | 2973 | DPRINTK(DRIVER_NAME": dev not setup\n"); |
adb9250a TM |
2974 | ret = -ENXIO; |
2975 | goto out; | |
1da177e4 LT |
2976 | } |
2977 | ||
adb9250a TM |
2978 | if (pd->refcnt > 0) { |
2979 | ret = -EBUSY; | |
2980 | goto out; | |
2981 | } | |
1da177e4 LT |
2982 | if (!IS_ERR(pd->cdrw.thread)) |
2983 | kthread_stop(pd->cdrw.thread); | |
2984 | ||
32694850 TM |
2985 | pkt_devs[idx] = NULL; |
2986 | ||
2987 | pkt_debugfs_dev_remove(pd); | |
2988 | pkt_sysfs_dev_remove(pd); | |
2989 | ||
1da177e4 LT |
2990 | blkdev_put(pd->bdev); |
2991 | ||
1da177e4 | 2992 | remove_proc_entry(pd->name, pkt_proc); |
7822082d | 2993 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); |
1da177e4 LT |
2994 | |
2995 | del_gendisk(pd->disk); | |
1312f40e | 2996 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2997 | put_disk(pd->disk); |
2998 | ||
1da177e4 LT |
2999 | mempool_destroy(pd->rb_pool); |
3000 | kfree(pd); | |
3001 | ||
3002 | /* This is safe: open() is still holding a reference. */ | |
3003 | module_put(THIS_MODULE); | |
adb9250a TM |
3004 | |
3005 | out: | |
3006 | mutex_unlock(&ctl_mutex); | |
3007 | return ret; | |
1da177e4 LT |
3008 | } |
3009 | ||
3010 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
3011 | { | |
adb9250a TM |
3012 | struct pktcdvd_device *pd; |
3013 | ||
3014 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3015 | ||
3016 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
3017 | if (pd) { |
3018 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
3019 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
3020 | } else { | |
3021 | ctrl_cmd->dev = 0; | |
3022 | ctrl_cmd->pkt_dev = 0; | |
3023 | } | |
3024 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
3025 | |
3026 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
3027 | } |
3028 | ||
3029 | static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
3030 | { | |
3031 | void __user *argp = (void __user *)arg; | |
3032 | struct pkt_ctrl_command ctrl_cmd; | |
3033 | int ret = 0; | |
adb9250a | 3034 | dev_t pkt_dev = 0; |
1da177e4 LT |
3035 | |
3036 | if (cmd != PACKET_CTRL_CMD) | |
3037 | return -ENOTTY; | |
3038 | ||
3039 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
3040 | return -EFAULT; | |
3041 | ||
3042 | switch (ctrl_cmd.command) { | |
3043 | case PKT_CTRL_CMD_SETUP: | |
3044 | if (!capable(CAP_SYS_ADMIN)) | |
3045 | return -EPERM; | |
adb9250a TM |
3046 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
3047 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
3048 | break; |
3049 | case PKT_CTRL_CMD_TEARDOWN: | |
3050 | if (!capable(CAP_SYS_ADMIN)) | |
3051 | return -EPERM; | |
adb9250a | 3052 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
3053 | break; |
3054 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 3055 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
3056 | break; |
3057 | default: | |
3058 | return -ENOTTY; | |
3059 | } | |
3060 | ||
3061 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
3062 | return -EFAULT; | |
3063 | return ret; | |
3064 | } | |
3065 | ||
3066 | ||
3067 | static struct file_operations pkt_ctl_fops = { | |
3068 | .ioctl = pkt_ctl_ioctl, | |
3069 | .owner = THIS_MODULE, | |
3070 | }; | |
3071 | ||
3072 | static struct miscdevice pkt_misc = { | |
3073 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 3074 | .name = DRIVER_NAME, |
1da177e4 LT |
3075 | .fops = &pkt_ctl_fops |
3076 | }; | |
3077 | ||
3078 | static int __init pkt_init(void) | |
3079 | { | |
3080 | int ret; | |
3081 | ||
32694850 TM |
3082 | mutex_init(&ctl_mutex); |
3083 | ||
0eaae62a MD |
3084 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
3085 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
3086 | if (!psd_pool) |
3087 | return -ENOMEM; | |
3088 | ||
add21660 | 3089 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 3090 | if (ret < 0) { |
7822082d | 3091 | printk(DRIVER_NAME": Unable to register block device\n"); |
1da177e4 LT |
3092 | goto out2; |
3093 | } | |
add21660 TM |
3094 | if (!pktdev_major) |
3095 | pktdev_major = ret; | |
1da177e4 | 3096 | |
32694850 TM |
3097 | ret = pkt_sysfs_init(); |
3098 | if (ret) | |
3099 | goto out; | |
3100 | ||
3101 | pkt_debugfs_init(); | |
3102 | ||
1da177e4 LT |
3103 | ret = misc_register(&pkt_misc); |
3104 | if (ret) { | |
7822082d | 3105 | printk(DRIVER_NAME": Unable to register misc device\n"); |
32694850 | 3106 | goto out_misc; |
1da177e4 LT |
3107 | } |
3108 | ||
7822082d | 3109 | pkt_proc = proc_mkdir(DRIVER_NAME, proc_root_driver); |
1da177e4 | 3110 | |
1da177e4 LT |
3111 | return 0; |
3112 | ||
32694850 TM |
3113 | out_misc: |
3114 | pkt_debugfs_cleanup(); | |
3115 | pkt_sysfs_cleanup(); | |
1da177e4 | 3116 | out: |
add21660 | 3117 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3118 | out2: |
3119 | mempool_destroy(psd_pool); | |
3120 | return ret; | |
3121 | } | |
3122 | ||
3123 | static void __exit pkt_exit(void) | |
3124 | { | |
7822082d | 3125 | remove_proc_entry(DRIVER_NAME, proc_root_driver); |
1da177e4 | 3126 | misc_deregister(&pkt_misc); |
32694850 TM |
3127 | |
3128 | pkt_debugfs_cleanup(); | |
3129 | pkt_sysfs_cleanup(); | |
3130 | ||
add21660 | 3131 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3132 | mempool_destroy(psd_pool); |
3133 | } | |
3134 | ||
3135 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3136 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3137 | MODULE_LICENSE("GPL"); | |
3138 | ||
3139 | module_init(pkt_init); | |
3140 | module_exit(pkt_exit); |