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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * dlmfs.c | |
5 | * | |
6 | * Code which implements the kernel side of a minimal userspace | |
7 | * interface to our DLM. This file handles the virtual file system | |
8 | * used for communication with userspace. Credit should go to ramfs, | |
9 | * which was a template for the fs side of this module. | |
10 | * | |
11 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public | |
15 | * License as published by the Free Software Foundation; either | |
16 | * version 2 of the License, or (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public | |
24 | * License along with this program; if not, write to the | |
25 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
26 | * Boston, MA 021110-1307, USA. | |
27 | */ | |
28 | ||
29 | /* Simple VFS hooks based on: */ | |
30 | /* | |
31 | * Resizable simple ram filesystem for Linux. | |
32 | * | |
33 | * Copyright (C) 2000 Linus Torvalds. | |
34 | * 2000 Transmeta Corp. | |
35 | */ | |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/fs.h> | |
39 | #include <linux/pagemap.h> | |
40 | #include <linux/types.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/highmem.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/smp_lock.h> | |
46 | #include <linux/backing-dev.h> | |
47 | ||
48 | #include <asm/uaccess.h> | |
49 | ||
50 | ||
51 | #include "cluster/nodemanager.h" | |
52 | #include "cluster/heartbeat.h" | |
53 | #include "cluster/tcp.h" | |
54 | ||
55 | #include "dlmapi.h" | |
56 | ||
57 | #include "userdlm.h" | |
58 | ||
59 | #include "dlmfsver.h" | |
60 | ||
61 | #define MLOG_MASK_PREFIX ML_DLMFS | |
62 | #include "cluster/masklog.h" | |
63 | ||
64 | static struct super_operations dlmfs_ops; | |
65 | static struct file_operations dlmfs_file_operations; | |
66 | static struct inode_operations dlmfs_dir_inode_operations; | |
67 | static struct inode_operations dlmfs_root_inode_operations; | |
68 | static struct inode_operations dlmfs_file_inode_operations; | |
69 | static kmem_cache_t *dlmfs_inode_cache; | |
70 | ||
71 | struct workqueue_struct *user_dlm_worker; | |
72 | ||
73 | /* | |
74 | * decodes a set of open flags into a valid lock level and a set of flags. | |
75 | * returns < 0 if we have invalid flags | |
76 | * flags which mean something to us: | |
77 | * O_RDONLY -> PRMODE level | |
78 | * O_WRONLY -> EXMODE level | |
79 | * | |
80 | * O_NONBLOCK -> LKM_NOQUEUE | |
81 | */ | |
82 | static int dlmfs_decode_open_flags(int open_flags, | |
83 | int *level, | |
84 | int *flags) | |
85 | { | |
86 | if (open_flags & (O_WRONLY|O_RDWR)) | |
87 | *level = LKM_EXMODE; | |
88 | else | |
89 | *level = LKM_PRMODE; | |
90 | ||
91 | *flags = 0; | |
92 | if (open_flags & O_NONBLOCK) | |
93 | *flags |= LKM_NOQUEUE; | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static int dlmfs_file_open(struct inode *inode, | |
99 | struct file *file) | |
100 | { | |
101 | int status, level, flags; | |
102 | struct dlmfs_filp_private *fp = NULL; | |
103 | struct dlmfs_inode_private *ip; | |
104 | ||
105 | if (S_ISDIR(inode->i_mode)) | |
106 | BUG(); | |
107 | ||
108 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, | |
109 | file->f_flags); | |
110 | ||
111 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); | |
112 | if (status < 0) | |
113 | goto bail; | |
114 | ||
115 | /* We don't want to honor O_APPEND at read/write time as it | |
116 | * doesn't make sense for LVB writes. */ | |
117 | file->f_flags &= ~O_APPEND; | |
118 | ||
119 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
120 | if (!fp) { | |
121 | status = -ENOMEM; | |
122 | goto bail; | |
123 | } | |
124 | fp->fp_lock_level = level; | |
125 | ||
126 | ip = DLMFS_I(inode); | |
127 | ||
128 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); | |
129 | if (status < 0) { | |
130 | /* this is a strange error to return here but I want | |
131 | * to be able userspace to be able to distinguish a | |
132 | * valid lock request from one that simply couldn't be | |
133 | * granted. */ | |
134 | if (flags & LKM_NOQUEUE && status == -EAGAIN) | |
135 | status = -ETXTBSY; | |
136 | kfree(fp); | |
137 | goto bail; | |
138 | } | |
139 | ||
140 | file->private_data = fp; | |
141 | bail: | |
142 | return status; | |
143 | } | |
144 | ||
145 | static int dlmfs_file_release(struct inode *inode, | |
146 | struct file *file) | |
147 | { | |
148 | int level, status; | |
149 | struct dlmfs_inode_private *ip = DLMFS_I(inode); | |
150 | struct dlmfs_filp_private *fp = | |
151 | (struct dlmfs_filp_private *) file->private_data; | |
152 | ||
153 | if (S_ISDIR(inode->i_mode)) | |
154 | BUG(); | |
155 | ||
156 | mlog(0, "close called on inode %lu\n", inode->i_ino); | |
157 | ||
158 | status = 0; | |
159 | if (fp) { | |
160 | level = fp->fp_lock_level; | |
161 | if (level != LKM_IVMODE) | |
162 | user_dlm_cluster_unlock(&ip->ip_lockres, level); | |
163 | ||
164 | kfree(fp); | |
165 | file->private_data = NULL; | |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | static ssize_t dlmfs_file_read(struct file *filp, | |
172 | char __user *buf, | |
173 | size_t count, | |
174 | loff_t *ppos) | |
175 | { | |
176 | int bytes_left; | |
177 | ssize_t readlen; | |
178 | char *lvb_buf; | |
179 | struct inode *inode = filp->f_dentry->d_inode; | |
180 | ||
181 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
182 | inode->i_ino, count, *ppos); | |
183 | ||
184 | if (*ppos >= i_size_read(inode)) | |
185 | return 0; | |
186 | ||
187 | if (!count) | |
188 | return 0; | |
189 | ||
190 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
191 | return -EFAULT; | |
192 | ||
193 | /* don't read past the lvb */ | |
194 | if ((count + *ppos) > i_size_read(inode)) | |
195 | readlen = i_size_read(inode) - *ppos; | |
196 | else | |
197 | readlen = count - *ppos; | |
198 | ||
199 | lvb_buf = kmalloc(readlen, GFP_KERNEL); | |
200 | if (!lvb_buf) | |
201 | return -ENOMEM; | |
202 | ||
203 | user_dlm_read_lvb(inode, lvb_buf, readlen); | |
204 | bytes_left = __copy_to_user(buf, lvb_buf, readlen); | |
205 | readlen -= bytes_left; | |
206 | ||
207 | kfree(lvb_buf); | |
208 | ||
209 | *ppos = *ppos + readlen; | |
210 | ||
211 | mlog(0, "read %zd bytes\n", readlen); | |
212 | return readlen; | |
213 | } | |
214 | ||
215 | static ssize_t dlmfs_file_write(struct file *filp, | |
216 | const char __user *buf, | |
217 | size_t count, | |
218 | loff_t *ppos) | |
219 | { | |
220 | int bytes_left; | |
221 | ssize_t writelen; | |
222 | char *lvb_buf; | |
223 | struct inode *inode = filp->f_dentry->d_inode; | |
224 | ||
225 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
226 | inode->i_ino, count, *ppos); | |
227 | ||
228 | if (*ppos >= i_size_read(inode)) | |
229 | return -ENOSPC; | |
230 | ||
231 | if (!count) | |
232 | return 0; | |
233 | ||
234 | if (!access_ok(VERIFY_READ, buf, count)) | |
235 | return -EFAULT; | |
236 | ||
237 | /* don't write past the lvb */ | |
238 | if ((count + *ppos) > i_size_read(inode)) | |
239 | writelen = i_size_read(inode) - *ppos; | |
240 | else | |
241 | writelen = count - *ppos; | |
242 | ||
243 | lvb_buf = kmalloc(writelen, GFP_KERNEL); | |
244 | if (!lvb_buf) | |
245 | return -ENOMEM; | |
246 | ||
247 | bytes_left = copy_from_user(lvb_buf, buf, writelen); | |
248 | writelen -= bytes_left; | |
249 | if (writelen) | |
250 | user_dlm_write_lvb(inode, lvb_buf, writelen); | |
251 | ||
252 | kfree(lvb_buf); | |
253 | ||
254 | *ppos = *ppos + writelen; | |
255 | mlog(0, "wrote %zd bytes\n", writelen); | |
256 | return writelen; | |
257 | } | |
258 | ||
259 | static void dlmfs_init_once(void *foo, | |
260 | kmem_cache_t *cachep, | |
261 | unsigned long flags) | |
262 | { | |
263 | struct dlmfs_inode_private *ip = | |
264 | (struct dlmfs_inode_private *) foo; | |
265 | ||
266 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
267 | SLAB_CTOR_CONSTRUCTOR) { | |
268 | ip->ip_dlm = NULL; | |
269 | ip->ip_parent = NULL; | |
270 | ||
271 | inode_init_once(&ip->ip_vfs_inode); | |
272 | } | |
273 | } | |
274 | ||
275 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
276 | { | |
277 | struct dlmfs_inode_private *ip; | |
278 | ||
279 | ip = kmem_cache_alloc(dlmfs_inode_cache, SLAB_NOFS); | |
280 | if (!ip) | |
281 | return NULL; | |
282 | ||
283 | return &ip->ip_vfs_inode; | |
284 | } | |
285 | ||
286 | static void dlmfs_destroy_inode(struct inode *inode) | |
287 | { | |
288 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); | |
289 | } | |
290 | ||
291 | static void dlmfs_clear_inode(struct inode *inode) | |
292 | { | |
293 | int status; | |
294 | struct dlmfs_inode_private *ip; | |
295 | ||
296 | if (!inode) | |
297 | return; | |
298 | ||
299 | mlog(0, "inode %lu\n", inode->i_ino); | |
300 | ||
301 | ip = DLMFS_I(inode); | |
302 | ||
303 | if (S_ISREG(inode->i_mode)) { | |
304 | status = user_dlm_destroy_lock(&ip->ip_lockres); | |
305 | if (status < 0) | |
306 | mlog_errno(status); | |
307 | iput(ip->ip_parent); | |
308 | goto clear_fields; | |
309 | } | |
310 | ||
311 | mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm); | |
312 | /* we must be a directory. If required, lets unregister the | |
313 | * dlm context now. */ | |
314 | if (ip->ip_dlm) | |
315 | user_dlm_unregister_context(ip->ip_dlm); | |
316 | clear_fields: | |
317 | ip->ip_parent = NULL; | |
318 | ip->ip_dlm = NULL; | |
319 | } | |
320 | ||
321 | static struct backing_dev_info dlmfs_backing_dev_info = { | |
322 | .ra_pages = 0, /* No readahead */ | |
323 | .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, | |
324 | }; | |
325 | ||
326 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) | |
327 | { | |
328 | struct inode *inode = new_inode(sb); | |
329 | int mode = S_IFDIR | 0755; | |
330 | struct dlmfs_inode_private *ip; | |
331 | ||
332 | if (inode) { | |
333 | ip = DLMFS_I(inode); | |
334 | ||
335 | inode->i_mode = mode; | |
336 | inode->i_uid = current->fsuid; | |
337 | inode->i_gid = current->fsgid; | |
338 | inode->i_blksize = PAGE_CACHE_SIZE; | |
339 | inode->i_blocks = 0; | |
340 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
341 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
342 | inode->i_nlink++; | |
343 | ||
344 | inode->i_fop = &simple_dir_operations; | |
345 | inode->i_op = &dlmfs_root_inode_operations; | |
346 | } | |
347 | ||
348 | return inode; | |
349 | } | |
350 | ||
351 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
352 | struct dentry *dentry, | |
353 | int mode) | |
354 | { | |
355 | struct super_block *sb = parent->i_sb; | |
356 | struct inode * inode = new_inode(sb); | |
357 | struct dlmfs_inode_private *ip; | |
358 | ||
359 | if (!inode) | |
360 | return NULL; | |
361 | ||
362 | inode->i_mode = mode; | |
363 | inode->i_uid = current->fsuid; | |
364 | inode->i_gid = current->fsgid; | |
365 | inode->i_blksize = PAGE_CACHE_SIZE; | |
366 | inode->i_blocks = 0; | |
367 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
368 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
369 | ||
370 | ip = DLMFS_I(inode); | |
371 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; | |
372 | ||
373 | switch (mode & S_IFMT) { | |
374 | default: | |
375 | /* for now we don't support anything other than | |
376 | * directories and regular files. */ | |
377 | BUG(); | |
378 | break; | |
379 | case S_IFREG: | |
380 | inode->i_op = &dlmfs_file_inode_operations; | |
381 | inode->i_fop = &dlmfs_file_operations; | |
382 | ||
383 | i_size_write(inode, DLM_LVB_LEN); | |
384 | ||
385 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
386 | ||
387 | /* released at clear_inode time, this insures that we | |
388 | * get to drop the dlm reference on each lock *before* | |
389 | * we call the unregister code for releasing parent | |
390 | * directories. */ | |
391 | ip->ip_parent = igrab(parent); | |
392 | BUG_ON(!ip->ip_parent); | |
393 | break; | |
394 | case S_IFDIR: | |
395 | inode->i_op = &dlmfs_dir_inode_operations; | |
396 | inode->i_fop = &simple_dir_operations; | |
397 | ||
398 | /* directory inodes start off with i_nlink == | |
399 | * 2 (for "." entry) */ | |
400 | inode->i_nlink++; | |
401 | break; | |
402 | } | |
403 | ||
404 | if (parent->i_mode & S_ISGID) { | |
405 | inode->i_gid = parent->i_gid; | |
406 | if (S_ISDIR(mode)) | |
407 | inode->i_mode |= S_ISGID; | |
408 | } | |
409 | ||
410 | return inode; | |
411 | } | |
412 | ||
413 | /* | |
414 | * File creation. Allocate an inode, and we're done.. | |
415 | */ | |
416 | /* SMP-safe */ | |
417 | static int dlmfs_mkdir(struct inode * dir, | |
418 | struct dentry * dentry, | |
419 | int mode) | |
420 | { | |
421 | int status; | |
422 | struct inode *inode = NULL; | |
423 | struct qstr *domain = &dentry->d_name; | |
424 | struct dlmfs_inode_private *ip; | |
425 | struct dlm_ctxt *dlm; | |
426 | ||
427 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
428 | ||
429 | /* verify that we have a proper domain */ | |
430 | if (domain->len >= O2NM_MAX_NAME_LEN) { | |
431 | status = -EINVAL; | |
432 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
433 | goto bail; | |
434 | } | |
435 | ||
436 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
437 | if (!inode) { | |
438 | status = -ENOMEM; | |
439 | mlog_errno(status); | |
440 | goto bail; | |
441 | } | |
442 | ||
443 | ip = DLMFS_I(inode); | |
444 | ||
445 | dlm = user_dlm_register_context(domain); | |
446 | if (IS_ERR(dlm)) { | |
447 | status = PTR_ERR(dlm); | |
448 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", | |
449 | status, domain->len, domain->name); | |
450 | goto bail; | |
451 | } | |
452 | ip->ip_dlm = dlm; | |
453 | ||
454 | dir->i_nlink++; | |
455 | d_instantiate(dentry, inode); | |
456 | dget(dentry); /* Extra count - pin the dentry in core */ | |
457 | ||
458 | status = 0; | |
459 | bail: | |
460 | if (status < 0) | |
461 | iput(inode); | |
462 | return status; | |
463 | } | |
464 | ||
465 | static int dlmfs_create(struct inode *dir, | |
466 | struct dentry *dentry, | |
467 | int mode, | |
468 | struct nameidata *nd) | |
469 | { | |
470 | int status = 0; | |
471 | struct inode *inode; | |
472 | struct qstr *name = &dentry->d_name; | |
473 | ||
474 | mlog(0, "create %.*s\n", name->len, name->name); | |
475 | ||
476 | /* verify name is valid and doesn't contain any dlm reserved | |
477 | * characters */ | |
478 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
479 | name->name[0] == '$') { | |
480 | status = -EINVAL; | |
481 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
482 | name->name); | |
483 | goto bail; | |
484 | } | |
485 | ||
486 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
487 | if (!inode) { | |
488 | status = -ENOMEM; | |
489 | mlog_errno(status); | |
490 | goto bail; | |
491 | } | |
492 | ||
493 | d_instantiate(dentry, inode); | |
494 | dget(dentry); /* Extra count - pin the dentry in core */ | |
495 | bail: | |
496 | return status; | |
497 | } | |
498 | ||
499 | static int dlmfs_unlink(struct inode *dir, | |
500 | struct dentry *dentry) | |
501 | { | |
502 | int status; | |
503 | struct inode *inode = dentry->d_inode; | |
504 | ||
505 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
506 | ||
507 | /* if there are no current holders, or none that are waiting | |
508 | * to acquire a lock, this basically destroys our lockres. */ | |
509 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
510 | if (status < 0) { | |
511 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", | |
512 | dentry->d_name.len, dentry->d_name.name, status); | |
513 | goto bail; | |
514 | } | |
515 | status = simple_unlink(dir, dentry); | |
516 | bail: | |
517 | return status; | |
518 | } | |
519 | ||
520 | static int dlmfs_fill_super(struct super_block * sb, | |
521 | void * data, | |
522 | int silent) | |
523 | { | |
524 | struct inode * inode; | |
525 | struct dentry * root; | |
526 | ||
527 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
528 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
529 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
530 | sb->s_magic = DLMFS_MAGIC; | |
531 | sb->s_op = &dlmfs_ops; | |
532 | inode = dlmfs_get_root_inode(sb); | |
533 | if (!inode) | |
534 | return -ENOMEM; | |
535 | ||
536 | root = d_alloc_root(inode); | |
537 | if (!root) { | |
538 | iput(inode); | |
539 | return -ENOMEM; | |
540 | } | |
541 | sb->s_root = root; | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static struct file_operations dlmfs_file_operations = { | |
546 | .open = dlmfs_file_open, | |
547 | .release = dlmfs_file_release, | |
548 | .read = dlmfs_file_read, | |
549 | .write = dlmfs_file_write, | |
550 | }; | |
551 | ||
552 | static struct inode_operations dlmfs_dir_inode_operations = { | |
553 | .create = dlmfs_create, | |
554 | .lookup = simple_lookup, | |
555 | .unlink = dlmfs_unlink, | |
556 | }; | |
557 | ||
558 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
559 | static struct inode_operations dlmfs_root_inode_operations = { | |
560 | .lookup = simple_lookup, | |
561 | .mkdir = dlmfs_mkdir, | |
562 | .rmdir = simple_rmdir, | |
563 | }; | |
564 | ||
565 | static struct super_operations dlmfs_ops = { | |
566 | .statfs = simple_statfs, | |
567 | .alloc_inode = dlmfs_alloc_inode, | |
568 | .destroy_inode = dlmfs_destroy_inode, | |
569 | .clear_inode = dlmfs_clear_inode, | |
570 | .drop_inode = generic_delete_inode, | |
571 | }; | |
572 | ||
573 | static struct inode_operations dlmfs_file_inode_operations = { | |
574 | .getattr = simple_getattr, | |
575 | }; | |
576 | ||
577 | static struct super_block *dlmfs_get_sb(struct file_system_type *fs_type, | |
578 | int flags, const char *dev_name, void *data) | |
579 | { | |
580 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super); | |
581 | } | |
582 | ||
583 | static struct file_system_type dlmfs_fs_type = { | |
584 | .owner = THIS_MODULE, | |
585 | .name = "ocfs2_dlmfs", | |
586 | .get_sb = dlmfs_get_sb, | |
587 | .kill_sb = kill_litter_super, | |
588 | }; | |
589 | ||
590 | static int __init init_dlmfs_fs(void) | |
591 | { | |
592 | int status; | |
593 | int cleanup_inode = 0, cleanup_worker = 0; | |
594 | ||
595 | dlmfs_print_version(); | |
596 | ||
597 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", | |
598 | sizeof(struct dlmfs_inode_private), | |
599 | 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, | |
600 | dlmfs_init_once, NULL); | |
601 | if (!dlmfs_inode_cache) | |
602 | return -ENOMEM; | |
603 | cleanup_inode = 1; | |
604 | ||
605 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); | |
606 | if (!user_dlm_worker) { | |
607 | status = -ENOMEM; | |
608 | goto bail; | |
609 | } | |
610 | cleanup_worker = 1; | |
611 | ||
612 | status = register_filesystem(&dlmfs_fs_type); | |
613 | bail: | |
614 | if (status) { | |
615 | if (cleanup_inode) | |
616 | kmem_cache_destroy(dlmfs_inode_cache); | |
617 | if (cleanup_worker) | |
618 | destroy_workqueue(user_dlm_worker); | |
619 | } else | |
620 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
621 | return status; | |
622 | } | |
623 | ||
624 | static void __exit exit_dlmfs_fs(void) | |
625 | { | |
626 | unregister_filesystem(&dlmfs_fs_type); | |
627 | ||
628 | flush_workqueue(user_dlm_worker); | |
629 | destroy_workqueue(user_dlm_worker); | |
630 | ||
631 | if (kmem_cache_destroy(dlmfs_inode_cache)) | |
632 | printk(KERN_INFO "dlmfs_inode_cache: not all structures " | |
633 | "were freed\n"); | |
634 | } | |
635 | ||
636 | MODULE_AUTHOR("Oracle"); | |
637 | MODULE_LICENSE("GPL"); | |
638 | ||
639 | module_init(init_dlmfs_fs) | |
640 | module_exit(exit_dlmfs_fs) |