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8df08c89 MF |
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; | |
00977a59 | 65 | static const struct file_operations dlmfs_file_operations; |
8df08c89 MF |
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; | |
e18b890b | 69 | static struct kmem_cache *dlmfs_inode_cache; |
8df08c89 MF |
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 | ||
ad8100e0 | 119 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
8df08c89 MF |
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; | |
d28c9174 | 179 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
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 | ||
ad8100e0 | 199 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
8df08c89 MF |
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; | |
d28c9174 | 223 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
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 | ||
ad8100e0 | 243 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
8df08c89 MF |
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, | |
e18b890b | 260 | struct kmem_cache *cachep, |
8df08c89 MF |
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 | ||
e6b4f8da | 279 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
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; | |
8df08c89 MF |
338 | inode->i_blocks = 0; |
339 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
340 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
d8c76e6f | 341 | inc_nlink(inode); |
8df08c89 MF |
342 | |
343 | inode->i_fop = &simple_dir_operations; | |
344 | inode->i_op = &dlmfs_root_inode_operations; | |
345 | } | |
346 | ||
347 | return inode; | |
348 | } | |
349 | ||
350 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
351 | struct dentry *dentry, | |
352 | int mode) | |
353 | { | |
354 | struct super_block *sb = parent->i_sb; | |
355 | struct inode * inode = new_inode(sb); | |
356 | struct dlmfs_inode_private *ip; | |
357 | ||
358 | if (!inode) | |
359 | return NULL; | |
360 | ||
361 | inode->i_mode = mode; | |
362 | inode->i_uid = current->fsuid; | |
363 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
364 | inode->i_blocks = 0; |
365 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
366 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
367 | ||
368 | ip = DLMFS_I(inode); | |
369 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; | |
370 | ||
371 | switch (mode & S_IFMT) { | |
372 | default: | |
373 | /* for now we don't support anything other than | |
374 | * directories and regular files. */ | |
375 | BUG(); | |
376 | break; | |
377 | case S_IFREG: | |
378 | inode->i_op = &dlmfs_file_inode_operations; | |
379 | inode->i_fop = &dlmfs_file_operations; | |
380 | ||
381 | i_size_write(inode, DLM_LVB_LEN); | |
382 | ||
383 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
384 | ||
385 | /* released at clear_inode time, this insures that we | |
386 | * get to drop the dlm reference on each lock *before* | |
387 | * we call the unregister code for releasing parent | |
388 | * directories. */ | |
389 | ip->ip_parent = igrab(parent); | |
390 | BUG_ON(!ip->ip_parent); | |
391 | break; | |
392 | case S_IFDIR: | |
393 | inode->i_op = &dlmfs_dir_inode_operations; | |
394 | inode->i_fop = &simple_dir_operations; | |
395 | ||
396 | /* directory inodes start off with i_nlink == | |
397 | * 2 (for "." entry) */ | |
d8c76e6f | 398 | inc_nlink(inode); |
8df08c89 MF |
399 | break; |
400 | } | |
401 | ||
402 | if (parent->i_mode & S_ISGID) { | |
403 | inode->i_gid = parent->i_gid; | |
404 | if (S_ISDIR(mode)) | |
405 | inode->i_mode |= S_ISGID; | |
406 | } | |
407 | ||
408 | return inode; | |
409 | } | |
410 | ||
411 | /* | |
412 | * File creation. Allocate an inode, and we're done.. | |
413 | */ | |
414 | /* SMP-safe */ | |
415 | static int dlmfs_mkdir(struct inode * dir, | |
416 | struct dentry * dentry, | |
417 | int mode) | |
418 | { | |
419 | int status; | |
420 | struct inode *inode = NULL; | |
421 | struct qstr *domain = &dentry->d_name; | |
422 | struct dlmfs_inode_private *ip; | |
423 | struct dlm_ctxt *dlm; | |
424 | ||
425 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
426 | ||
427 | /* verify that we have a proper domain */ | |
428 | if (domain->len >= O2NM_MAX_NAME_LEN) { | |
429 | status = -EINVAL; | |
430 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
431 | goto bail; | |
432 | } | |
433 | ||
434 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
435 | if (!inode) { | |
436 | status = -ENOMEM; | |
437 | mlog_errno(status); | |
438 | goto bail; | |
439 | } | |
440 | ||
441 | ip = DLMFS_I(inode); | |
442 | ||
443 | dlm = user_dlm_register_context(domain); | |
444 | if (IS_ERR(dlm)) { | |
445 | status = PTR_ERR(dlm); | |
446 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", | |
447 | status, domain->len, domain->name); | |
448 | goto bail; | |
449 | } | |
450 | ip->ip_dlm = dlm; | |
451 | ||
d8c76e6f | 452 | inc_nlink(dir); |
8df08c89 MF |
453 | d_instantiate(dentry, inode); |
454 | dget(dentry); /* Extra count - pin the dentry in core */ | |
455 | ||
456 | status = 0; | |
457 | bail: | |
458 | if (status < 0) | |
459 | iput(inode); | |
460 | return status; | |
461 | } | |
462 | ||
463 | static int dlmfs_create(struct inode *dir, | |
464 | struct dentry *dentry, | |
465 | int mode, | |
466 | struct nameidata *nd) | |
467 | { | |
468 | int status = 0; | |
469 | struct inode *inode; | |
470 | struct qstr *name = &dentry->d_name; | |
471 | ||
472 | mlog(0, "create %.*s\n", name->len, name->name); | |
473 | ||
474 | /* verify name is valid and doesn't contain any dlm reserved | |
475 | * characters */ | |
476 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
477 | name->name[0] == '$') { | |
478 | status = -EINVAL; | |
479 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
480 | name->name); | |
481 | goto bail; | |
482 | } | |
483 | ||
484 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
485 | if (!inode) { | |
486 | status = -ENOMEM; | |
487 | mlog_errno(status); | |
488 | goto bail; | |
489 | } | |
490 | ||
491 | d_instantiate(dentry, inode); | |
492 | dget(dentry); /* Extra count - pin the dentry in core */ | |
493 | bail: | |
494 | return status; | |
495 | } | |
496 | ||
497 | static int dlmfs_unlink(struct inode *dir, | |
498 | struct dentry *dentry) | |
499 | { | |
500 | int status; | |
501 | struct inode *inode = dentry->d_inode; | |
502 | ||
503 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
504 | ||
505 | /* if there are no current holders, or none that are waiting | |
506 | * to acquire a lock, this basically destroys our lockres. */ | |
507 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
508 | if (status < 0) { | |
509 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", | |
510 | dentry->d_name.len, dentry->d_name.name, status); | |
511 | goto bail; | |
512 | } | |
513 | status = simple_unlink(dir, dentry); | |
514 | bail: | |
515 | return status; | |
516 | } | |
517 | ||
518 | static int dlmfs_fill_super(struct super_block * sb, | |
519 | void * data, | |
520 | int silent) | |
521 | { | |
522 | struct inode * inode; | |
523 | struct dentry * root; | |
524 | ||
525 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
526 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
527 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
528 | sb->s_magic = DLMFS_MAGIC; | |
529 | sb->s_op = &dlmfs_ops; | |
530 | inode = dlmfs_get_root_inode(sb); | |
531 | if (!inode) | |
532 | return -ENOMEM; | |
533 | ||
534 | root = d_alloc_root(inode); | |
535 | if (!root) { | |
536 | iput(inode); | |
537 | return -ENOMEM; | |
538 | } | |
539 | sb->s_root = root; | |
540 | return 0; | |
541 | } | |
542 | ||
00977a59 | 543 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
544 | .open = dlmfs_file_open, |
545 | .release = dlmfs_file_release, | |
546 | .read = dlmfs_file_read, | |
547 | .write = dlmfs_file_write, | |
548 | }; | |
549 | ||
550 | static struct inode_operations dlmfs_dir_inode_operations = { | |
551 | .create = dlmfs_create, | |
552 | .lookup = simple_lookup, | |
553 | .unlink = dlmfs_unlink, | |
554 | }; | |
555 | ||
556 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
557 | static struct inode_operations dlmfs_root_inode_operations = { | |
558 | .lookup = simple_lookup, | |
559 | .mkdir = dlmfs_mkdir, | |
560 | .rmdir = simple_rmdir, | |
561 | }; | |
562 | ||
563 | static struct super_operations dlmfs_ops = { | |
564 | .statfs = simple_statfs, | |
565 | .alloc_inode = dlmfs_alloc_inode, | |
566 | .destroy_inode = dlmfs_destroy_inode, | |
567 | .clear_inode = dlmfs_clear_inode, | |
568 | .drop_inode = generic_delete_inode, | |
569 | }; | |
570 | ||
571 | static struct inode_operations dlmfs_file_inode_operations = { | |
572 | .getattr = simple_getattr, | |
573 | }; | |
574 | ||
454e2398 DH |
575 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
576 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
8df08c89 | 577 | { |
454e2398 | 578 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
8df08c89 MF |
579 | } |
580 | ||
581 | static struct file_system_type dlmfs_fs_type = { | |
582 | .owner = THIS_MODULE, | |
583 | .name = "ocfs2_dlmfs", | |
584 | .get_sb = dlmfs_get_sb, | |
585 | .kill_sb = kill_litter_super, | |
586 | }; | |
587 | ||
588 | static int __init init_dlmfs_fs(void) | |
589 | { | |
590 | int status; | |
591 | int cleanup_inode = 0, cleanup_worker = 0; | |
592 | ||
593 | dlmfs_print_version(); | |
594 | ||
595 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", | |
596 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 PJ |
597 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
598 | SLAB_MEM_SPREAD), | |
8df08c89 MF |
599 | dlmfs_init_once, NULL); |
600 | if (!dlmfs_inode_cache) | |
601 | return -ENOMEM; | |
602 | cleanup_inode = 1; | |
603 | ||
604 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); | |
605 | if (!user_dlm_worker) { | |
606 | status = -ENOMEM; | |
607 | goto bail; | |
608 | } | |
609 | cleanup_worker = 1; | |
610 | ||
611 | status = register_filesystem(&dlmfs_fs_type); | |
612 | bail: | |
613 | if (status) { | |
614 | if (cleanup_inode) | |
615 | kmem_cache_destroy(dlmfs_inode_cache); | |
616 | if (cleanup_worker) | |
617 | destroy_workqueue(user_dlm_worker); | |
618 | } else | |
619 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
620 | return status; | |
621 | } | |
622 | ||
623 | static void __exit exit_dlmfs_fs(void) | |
624 | { | |
625 | unregister_filesystem(&dlmfs_fs_type); | |
626 | ||
627 | flush_workqueue(user_dlm_worker); | |
628 | destroy_workqueue(user_dlm_worker); | |
629 | ||
1a1d92c1 | 630 | kmem_cache_destroy(dlmfs_inode_cache); |
8df08c89 MF |
631 | } |
632 | ||
633 | MODULE_AUTHOR("Oracle"); | |
634 | MODULE_LICENSE("GPL"); | |
635 | ||
636 | module_init(init_dlmfs_fs) | |
637 | module_exit(exit_dlmfs_fs) |