Root/
1 | |
2 | /* |
3 | osdblk.c -- Export a single SCSI OSD object as a Linux block device |
4 | |
5 | |
6 | Copyright 2009 Red Hat, Inc. |
7 | |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by |
10 | the Free Software Foundation. |
11 | |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. |
16 | |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; see the file COPYING. If not, write to |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
20 | |
21 | |
22 | Instructions for use |
23 | -------------------- |
24 | |
25 | 1) Map a Linux block device to an existing OSD object. |
26 | |
27 | In this example, we will use partition id 1234, object id 5678, |
28 | OSD device /dev/osd1. |
29 | |
30 | $ echo "1234 5678 /dev/osd1" > /sys/class/osdblk/add |
31 | |
32 | |
33 | 2) List all active blkdev<->object mappings. |
34 | |
35 | In this example, we have performed step #1 twice, creating two blkdevs, |
36 | mapped to two separate OSD objects. |
37 | |
38 | $ cat /sys/class/osdblk/list |
39 | 0 174 1234 5678 /dev/osd1 |
40 | 1 179 1994 897123 /dev/osd0 |
41 | |
42 | The columns, in order, are: |
43 | - blkdev unique id |
44 | - blkdev assigned major |
45 | - OSD object partition id |
46 | - OSD object id |
47 | - OSD device |
48 | |
49 | |
50 | 3) Remove an active blkdev<->object mapping. |
51 | |
52 | In this example, we remove the mapping with blkdev unique id 1. |
53 | |
54 | $ echo 1 > /sys/class/osdblk/remove |
55 | |
56 | |
57 | NOTE: The actual creation and deletion of OSD objects is outside the scope |
58 | of this driver. |
59 | |
60 | */ |
61 | |
62 | #include <linux/kernel.h> |
63 | #include <linux/device.h> |
64 | #include <linux/module.h> |
65 | #include <linux/fs.h> |
66 | #include <linux/slab.h> |
67 | #include <scsi/osd_initiator.h> |
68 | #include <scsi/osd_attributes.h> |
69 | #include <scsi/osd_sec.h> |
70 | #include <scsi/scsi_device.h> |
71 | |
72 | #define DRV_NAME "osdblk" |
73 | #define PFX DRV_NAME ": " |
74 | |
75 | /* #define _OSDBLK_DEBUG */ |
76 | #ifdef _OSDBLK_DEBUG |
77 | #define OSDBLK_DEBUG(fmt, a...) \ |
78 | printk(KERN_NOTICE "osdblk @%s:%d: " fmt, __func__, __LINE__, ##a) |
79 | #else |
80 | #define OSDBLK_DEBUG(fmt, a...) \ |
81 | do { if (0) printk(fmt, ##a); } while (0) |
82 | #endif |
83 | |
84 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
85 | MODULE_DESCRIPTION("block device inside an OSD object osdblk.ko"); |
86 | MODULE_LICENSE("GPL"); |
87 | |
88 | struct osdblk_device; |
89 | |
90 | enum { |
91 | OSDBLK_MINORS_PER_MAJOR = 256, /* max minors per blkdev */ |
92 | OSDBLK_MAX_REQ = 32, /* max parallel requests */ |
93 | OSDBLK_OP_TIMEOUT = 4 * 60, /* sync OSD req timeout */ |
94 | }; |
95 | |
96 | struct osdblk_request { |
97 | struct request *rq; /* blk layer request */ |
98 | struct bio *bio; /* cloned bio */ |
99 | struct osdblk_device *osdev; /* associated blkdev */ |
100 | }; |
101 | |
102 | struct osdblk_device { |
103 | int id; /* blkdev unique id */ |
104 | |
105 | int major; /* blkdev assigned major */ |
106 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
107 | struct request_queue *q; |
108 | |
109 | struct osd_dev *osd; /* associated OSD */ |
110 | |
111 | char name[32]; /* blkdev name, e.g. osdblk34 */ |
112 | |
113 | spinlock_t lock; /* queue lock */ |
114 | |
115 | struct osd_obj_id obj; /* OSD partition, obj id */ |
116 | uint8_t obj_cred[OSD_CAP_LEN]; /* OSD cred */ |
117 | |
118 | struct osdblk_request req[OSDBLK_MAX_REQ]; /* request table */ |
119 | |
120 | struct list_head node; |
121 | |
122 | char osd_path[0]; /* OSD device path */ |
123 | }; |
124 | |
125 | static struct class *class_osdblk; /* /sys/class/osdblk */ |
126 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
127 | static LIST_HEAD(osdblkdev_list); |
128 | |
129 | static const struct block_device_operations osdblk_bd_ops = { |
130 | .owner = THIS_MODULE, |
131 | }; |
132 | |
133 | static const struct osd_attr g_attr_logical_length = ATTR_DEF( |
134 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); |
135 | |
136 | static void osdblk_make_credential(u8 cred_a[OSD_CAP_LEN], |
137 | const struct osd_obj_id *obj) |
138 | { |
139 | osd_sec_init_nosec_doall_caps(cred_a, obj, false, true); |
140 | } |
141 | |
142 | /* copied from exofs; move to libosd? */ |
143 | /* |
144 | * Perform a synchronous OSD operation. copied from exofs; move to libosd? |
145 | */ |
146 | static int osd_sync_op(struct osd_request *or, int timeout, uint8_t *credential) |
147 | { |
148 | int ret; |
149 | |
150 | or->timeout = timeout; |
151 | ret = osd_finalize_request(or, 0, credential, NULL); |
152 | if (ret) |
153 | return ret; |
154 | |
155 | ret = osd_execute_request(or); |
156 | |
157 | /* osd_req_decode_sense(or, ret); */ |
158 | return ret; |
159 | } |
160 | |
161 | /* |
162 | * Perform an asynchronous OSD operation. copied from exofs; move to libosd? |
163 | */ |
164 | static int osd_async_op(struct osd_request *or, osd_req_done_fn *async_done, |
165 | void *caller_context, u8 *cred) |
166 | { |
167 | int ret; |
168 | |
169 | ret = osd_finalize_request(or, 0, cred, NULL); |
170 | if (ret) |
171 | return ret; |
172 | |
173 | ret = osd_execute_request_async(or, async_done, caller_context); |
174 | |
175 | return ret; |
176 | } |
177 | |
178 | /* copied from exofs; move to libosd? */ |
179 | static int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr) |
180 | { |
181 | struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */ |
182 | void *iter = NULL; |
183 | int nelem; |
184 | |
185 | do { |
186 | nelem = 1; |
187 | osd_req_decode_get_attr_list(or, &cur_attr, &nelem, &iter); |
188 | if ((cur_attr.attr_page == attr->attr_page) && |
189 | (cur_attr.attr_id == attr->attr_id)) { |
190 | attr->len = cur_attr.len; |
191 | attr->val_ptr = cur_attr.val_ptr; |
192 | return 0; |
193 | } |
194 | } while (iter); |
195 | |
196 | return -EIO; |
197 | } |
198 | |
199 | static int osdblk_get_obj_size(struct osdblk_device *osdev, u64 *size_out) |
200 | { |
201 | struct osd_request *or; |
202 | struct osd_attr attr; |
203 | int ret; |
204 | |
205 | /* start request */ |
206 | or = osd_start_request(osdev->osd, GFP_KERNEL); |
207 | if (!or) |
208 | return -ENOMEM; |
209 | |
210 | /* create a get-attributes(length) request */ |
211 | osd_req_get_attributes(or, &osdev->obj); |
212 | |
213 | osd_req_add_get_attr_list(or, &g_attr_logical_length, 1); |
214 | |
215 | /* execute op synchronously */ |
216 | ret = osd_sync_op(or, OSDBLK_OP_TIMEOUT, osdev->obj_cred); |
217 | if (ret) |
218 | goto out; |
219 | |
220 | /* extract length from returned attribute info */ |
221 | attr = g_attr_logical_length; |
222 | ret = extract_attr_from_req(or, &attr); |
223 | if (ret) |
224 | goto out; |
225 | |
226 | *size_out = get_unaligned_be64(attr.val_ptr); |
227 | |
228 | out: |
229 | osd_end_request(or); |
230 | return ret; |
231 | |
232 | } |
233 | |
234 | static void osdblk_osd_complete(struct osd_request *or, void *private) |
235 | { |
236 | struct osdblk_request *orq = private; |
237 | struct osd_sense_info osi; |
238 | int ret = osd_req_decode_sense(or, &osi); |
239 | |
240 | if (ret) { |
241 | ret = -EIO; |
242 | OSDBLK_DEBUG("osdblk_osd_complete with err=%d\n", ret); |
243 | } |
244 | |
245 | /* complete OSD request */ |
246 | osd_end_request(or); |
247 | |
248 | /* complete request passed to osdblk by block layer */ |
249 | __blk_end_request_all(orq->rq, ret); |
250 | } |
251 | |
252 | static void bio_chain_put(struct bio *chain) |
253 | { |
254 | struct bio *tmp; |
255 | |
256 | while (chain) { |
257 | tmp = chain; |
258 | chain = chain->bi_next; |
259 | |
260 | bio_put(tmp); |
261 | } |
262 | } |
263 | |
264 | static struct bio *bio_chain_clone(struct bio *old_chain, gfp_t gfpmask) |
265 | { |
266 | struct bio *tmp, *new_chain = NULL, *tail = NULL; |
267 | |
268 | while (old_chain) { |
269 | tmp = bio_clone_kmalloc(old_chain, gfpmask); |
270 | if (!tmp) |
271 | goto err_out; |
272 | |
273 | tmp->bi_bdev = NULL; |
274 | gfpmask &= ~__GFP_WAIT; |
275 | tmp->bi_next = NULL; |
276 | |
277 | if (!new_chain) |
278 | new_chain = tail = tmp; |
279 | else { |
280 | tail->bi_next = tmp; |
281 | tail = tmp; |
282 | } |
283 | |
284 | old_chain = old_chain->bi_next; |
285 | } |
286 | |
287 | return new_chain; |
288 | |
289 | err_out: |
290 | OSDBLK_DEBUG("bio_chain_clone with err\n"); |
291 | bio_chain_put(new_chain); |
292 | return NULL; |
293 | } |
294 | |
295 | static void osdblk_rq_fn(struct request_queue *q) |
296 | { |
297 | struct osdblk_device *osdev = q->queuedata; |
298 | |
299 | while (1) { |
300 | struct request *rq; |
301 | struct osdblk_request *orq; |
302 | struct osd_request *or; |
303 | struct bio *bio; |
304 | bool do_write, do_flush; |
305 | |
306 | /* peek at request from block layer */ |
307 | rq = blk_fetch_request(q); |
308 | if (!rq) |
309 | break; |
310 | |
311 | /* filter out block requests we don't understand */ |
312 | if (rq->cmd_type != REQ_TYPE_FS) { |
313 | blk_end_request_all(rq, 0); |
314 | continue; |
315 | } |
316 | |
317 | /* deduce our operation (read, write, flush) */ |
318 | /* I wish the block layer simplified cmd_type/cmd_flags/cmd[] |
319 | * into a clearly defined set of RPC commands: |
320 | * read, write, flush, scsi command, power mgmt req, |
321 | * driver-specific, etc. |
322 | */ |
323 | |
324 | do_flush = rq->cmd_flags & REQ_FLUSH; |
325 | do_write = (rq_data_dir(rq) == WRITE); |
326 | |
327 | if (!do_flush) { /* osd_flush does not use a bio */ |
328 | /* a bio clone to be passed down to OSD request */ |
329 | bio = bio_chain_clone(rq->bio, GFP_ATOMIC); |
330 | if (!bio) |
331 | break; |
332 | } else |
333 | bio = NULL; |
334 | |
335 | /* alloc internal OSD request, for OSD command execution */ |
336 | or = osd_start_request(osdev->osd, GFP_ATOMIC); |
337 | if (!or) { |
338 | bio_chain_put(bio); |
339 | OSDBLK_DEBUG("osd_start_request with err\n"); |
340 | break; |
341 | } |
342 | |
343 | orq = &osdev->req[rq->tag]; |
344 | orq->rq = rq; |
345 | orq->bio = bio; |
346 | orq->osdev = osdev; |
347 | |
348 | /* init OSD command: flush, write or read */ |
349 | if (do_flush) |
350 | osd_req_flush_object(or, &osdev->obj, |
351 | OSD_CDB_FLUSH_ALL, 0, 0); |
352 | else if (do_write) |
353 | osd_req_write(or, &osdev->obj, blk_rq_pos(rq) * 512ULL, |
354 | bio, blk_rq_bytes(rq)); |
355 | else |
356 | osd_req_read(or, &osdev->obj, blk_rq_pos(rq) * 512ULL, |
357 | bio, blk_rq_bytes(rq)); |
358 | |
359 | OSDBLK_DEBUG("%s 0x%x bytes at 0x%llx\n", |
360 | do_flush ? "flush" : do_write ? |
361 | "write" : "read", blk_rq_bytes(rq), |
362 | blk_rq_pos(rq) * 512ULL); |
363 | |
364 | /* begin OSD command execution */ |
365 | if (osd_async_op(or, osdblk_osd_complete, orq, |
366 | osdev->obj_cred)) { |
367 | osd_end_request(or); |
368 | blk_requeue_request(q, rq); |
369 | bio_chain_put(bio); |
370 | OSDBLK_DEBUG("osd_execute_request_async with err\n"); |
371 | break; |
372 | } |
373 | |
374 | /* remove the special 'flush' marker, now that the command |
375 | * is executing |
376 | */ |
377 | rq->special = NULL; |
378 | } |
379 | } |
380 | |
381 | static void osdblk_free_disk(struct osdblk_device *osdev) |
382 | { |
383 | struct gendisk *disk = osdev->disk; |
384 | |
385 | if (!disk) |
386 | return; |
387 | |
388 | if (disk->flags & GENHD_FL_UP) |
389 | del_gendisk(disk); |
390 | if (disk->queue) |
391 | blk_cleanup_queue(disk->queue); |
392 | put_disk(disk); |
393 | } |
394 | |
395 | static int osdblk_init_disk(struct osdblk_device *osdev) |
396 | { |
397 | struct gendisk *disk; |
398 | struct request_queue *q; |
399 | int rc; |
400 | u64 obj_size = 0; |
401 | |
402 | /* contact OSD, request size info about the object being mapped */ |
403 | rc = osdblk_get_obj_size(osdev, &obj_size); |
404 | if (rc) |
405 | return rc; |
406 | |
407 | /* create gendisk info */ |
408 | disk = alloc_disk(OSDBLK_MINORS_PER_MAJOR); |
409 | if (!disk) |
410 | return -ENOMEM; |
411 | |
412 | sprintf(disk->disk_name, DRV_NAME "%d", osdev->id); |
413 | disk->major = osdev->major; |
414 | disk->first_minor = 0; |
415 | disk->fops = &osdblk_bd_ops; |
416 | disk->private_data = osdev; |
417 | |
418 | /* init rq */ |
419 | q = blk_init_queue(osdblk_rq_fn, &osdev->lock); |
420 | if (!q) { |
421 | put_disk(disk); |
422 | return -ENOMEM; |
423 | } |
424 | |
425 | /* switch queue to TCQ mode; allocate tag map */ |
426 | rc = blk_queue_init_tags(q, OSDBLK_MAX_REQ, NULL); |
427 | if (rc) { |
428 | blk_cleanup_queue(q); |
429 | put_disk(disk); |
430 | return rc; |
431 | } |
432 | |
433 | /* Set our limits to the lower device limits, because osdblk cannot |
434 | * sleep when allocating a lower-request and therefore cannot be |
435 | * bouncing. |
436 | */ |
437 | blk_queue_stack_limits(q, osd_request_queue(osdev->osd)); |
438 | |
439 | blk_queue_prep_rq(q, blk_queue_start_tag); |
440 | blk_queue_flush(q, REQ_FLUSH); |
441 | |
442 | disk->queue = q; |
443 | |
444 | q->queuedata = osdev; |
445 | |
446 | osdev->disk = disk; |
447 | osdev->q = q; |
448 | |
449 | /* finally, announce the disk to the world */ |
450 | set_capacity(disk, obj_size / 512ULL); |
451 | add_disk(disk); |
452 | |
453 | printk(KERN_INFO "%s: Added of size 0x%llx\n", |
454 | disk->disk_name, (unsigned long long)obj_size); |
455 | |
456 | return 0; |
457 | } |
458 | |
459 | /******************************************************************** |
460 | * /sys/class/osdblk/ |
461 | * add map OSD object to blkdev |
462 | * remove unmap OSD object |
463 | * list show mappings |
464 | *******************************************************************/ |
465 | |
466 | static void class_osdblk_release(struct class *cls) |
467 | { |
468 | kfree(cls); |
469 | } |
470 | |
471 | static ssize_t class_osdblk_list(struct class *c, |
472 | struct class_attribute *attr, |
473 | char *data) |
474 | { |
475 | int n = 0; |
476 | struct list_head *tmp; |
477 | |
478 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
479 | |
480 | list_for_each(tmp, &osdblkdev_list) { |
481 | struct osdblk_device *osdev; |
482 | |
483 | osdev = list_entry(tmp, struct osdblk_device, node); |
484 | |
485 | n += sprintf(data+n, "%d %d %llu %llu %s\n", |
486 | osdev->id, |
487 | osdev->major, |
488 | osdev->obj.partition, |
489 | osdev->obj.id, |
490 | osdev->osd_path); |
491 | } |
492 | |
493 | mutex_unlock(&ctl_mutex); |
494 | return n; |
495 | } |
496 | |
497 | static ssize_t class_osdblk_add(struct class *c, |
498 | struct class_attribute *attr, |
499 | const char *buf, size_t count) |
500 | { |
501 | struct osdblk_device *osdev; |
502 | ssize_t rc; |
503 | int irc, new_id = 0; |
504 | struct list_head *tmp; |
505 | |
506 | if (!try_module_get(THIS_MODULE)) |
507 | return -ENODEV; |
508 | |
509 | /* new osdblk_device object */ |
510 | osdev = kzalloc(sizeof(*osdev) + strlen(buf) + 1, GFP_KERNEL); |
511 | if (!osdev) { |
512 | rc = -ENOMEM; |
513 | goto err_out_mod; |
514 | } |
515 | |
516 | /* static osdblk_device initialization */ |
517 | spin_lock_init(&osdev->lock); |
518 | INIT_LIST_HEAD(&osdev->node); |
519 | |
520 | /* generate unique id: find highest unique id, add one */ |
521 | |
522 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
523 | |
524 | list_for_each(tmp, &osdblkdev_list) { |
525 | struct osdblk_device *osdev; |
526 | |
527 | osdev = list_entry(tmp, struct osdblk_device, node); |
528 | if (osdev->id > new_id) |
529 | new_id = osdev->id + 1; |
530 | } |
531 | |
532 | osdev->id = new_id; |
533 | |
534 | /* add to global list */ |
535 | list_add_tail(&osdev->node, &osdblkdev_list); |
536 | |
537 | mutex_unlock(&ctl_mutex); |
538 | |
539 | /* parse add command */ |
540 | if (sscanf(buf, "%llu %llu %s", &osdev->obj.partition, &osdev->obj.id, |
541 | osdev->osd_path) != 3) { |
542 | rc = -EINVAL; |
543 | goto err_out_slot; |
544 | } |
545 | |
546 | /* initialize rest of new object */ |
547 | sprintf(osdev->name, DRV_NAME "%d", osdev->id); |
548 | |
549 | /* contact requested OSD */ |
550 | osdev->osd = osduld_path_lookup(osdev->osd_path); |
551 | if (IS_ERR(osdev->osd)) { |
552 | rc = PTR_ERR(osdev->osd); |
553 | goto err_out_slot; |
554 | } |
555 | |
556 | /* build OSD credential */ |
557 | osdblk_make_credential(osdev->obj_cred, &osdev->obj); |
558 | |
559 | /* register our block device */ |
560 | irc = register_blkdev(0, osdev->name); |
561 | if (irc < 0) { |
562 | rc = irc; |
563 | goto err_out_osd; |
564 | } |
565 | |
566 | osdev->major = irc; |
567 | |
568 | /* set up and announce blkdev mapping */ |
569 | rc = osdblk_init_disk(osdev); |
570 | if (rc) |
571 | goto err_out_blkdev; |
572 | |
573 | return count; |
574 | |
575 | err_out_blkdev: |
576 | unregister_blkdev(osdev->major, osdev->name); |
577 | err_out_osd: |
578 | osduld_put_device(osdev->osd); |
579 | err_out_slot: |
580 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
581 | list_del_init(&osdev->node); |
582 | mutex_unlock(&ctl_mutex); |
583 | |
584 | kfree(osdev); |
585 | err_out_mod: |
586 | OSDBLK_DEBUG("Error adding device %s\n", buf); |
587 | module_put(THIS_MODULE); |
588 | return rc; |
589 | } |
590 | |
591 | static ssize_t class_osdblk_remove(struct class *c, |
592 | struct class_attribute *attr, |
593 | const char *buf, |
594 | size_t count) |
595 | { |
596 | struct osdblk_device *osdev = NULL; |
597 | int target_id, rc; |
598 | unsigned long ul; |
599 | struct list_head *tmp; |
600 | |
601 | rc = strict_strtoul(buf, 10, &ul); |
602 | if (rc) |
603 | return rc; |
604 | |
605 | /* convert to int; abort if we lost anything in the conversion */ |
606 | target_id = (int) ul; |
607 | if (target_id != ul) |
608 | return -EINVAL; |
609 | |
610 | /* remove object from list immediately */ |
611 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
612 | |
613 | list_for_each(tmp, &osdblkdev_list) { |
614 | osdev = list_entry(tmp, struct osdblk_device, node); |
615 | if (osdev->id == target_id) { |
616 | list_del_init(&osdev->node); |
617 | break; |
618 | } |
619 | osdev = NULL; |
620 | } |
621 | |
622 | mutex_unlock(&ctl_mutex); |
623 | |
624 | if (!osdev) |
625 | return -ENOENT; |
626 | |
627 | /* clean up and free blkdev and associated OSD connection */ |
628 | osdblk_free_disk(osdev); |
629 | unregister_blkdev(osdev->major, osdev->name); |
630 | osduld_put_device(osdev->osd); |
631 | kfree(osdev); |
632 | |
633 | /* release module ref */ |
634 | module_put(THIS_MODULE); |
635 | |
636 | return count; |
637 | } |
638 | |
639 | static struct class_attribute class_osdblk_attrs[] = { |
640 | __ATTR(add, 0200, NULL, class_osdblk_add), |
641 | __ATTR(remove, 0200, NULL, class_osdblk_remove), |
642 | __ATTR(list, 0444, class_osdblk_list, NULL), |
643 | __ATTR_NULL |
644 | }; |
645 | |
646 | static int osdblk_sysfs_init(void) |
647 | { |
648 | int ret = 0; |
649 | |
650 | /* |
651 | * create control files in sysfs |
652 | * /sys/class/osdblk/... |
653 | */ |
654 | class_osdblk = kzalloc(sizeof(*class_osdblk), GFP_KERNEL); |
655 | if (!class_osdblk) |
656 | return -ENOMEM; |
657 | |
658 | class_osdblk->name = DRV_NAME; |
659 | class_osdblk->owner = THIS_MODULE; |
660 | class_osdblk->class_release = class_osdblk_release; |
661 | class_osdblk->class_attrs = class_osdblk_attrs; |
662 | |
663 | ret = class_register(class_osdblk); |
664 | if (ret) { |
665 | kfree(class_osdblk); |
666 | class_osdblk = NULL; |
667 | printk(PFX "failed to create class osdblk\n"); |
668 | return ret; |
669 | } |
670 | |
671 | return 0; |
672 | } |
673 | |
674 | static void osdblk_sysfs_cleanup(void) |
675 | { |
676 | if (class_osdblk) |
677 | class_destroy(class_osdblk); |
678 | class_osdblk = NULL; |
679 | } |
680 | |
681 | static int __init osdblk_init(void) |
682 | { |
683 | int rc; |
684 | |
685 | rc = osdblk_sysfs_init(); |
686 | if (rc) |
687 | return rc; |
688 | |
689 | return 0; |
690 | } |
691 | |
692 | static void __exit osdblk_exit(void) |
693 | { |
694 | osdblk_sysfs_cleanup(); |
695 | } |
696 | |
697 | module_init(osdblk_init); |
698 | module_exit(osdblk_exit); |
699 | |
700 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz47xx
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master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9