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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> | |
8df08c89 MF |
45 | #include <linux/backing-dev.h> |
46 | ||
47 | #include <asm/uaccess.h> | |
48 | ||
49 | ||
50 | #include "cluster/nodemanager.h" | |
51 | #include "cluster/heartbeat.h" | |
52 | #include "cluster/tcp.h" | |
53 | ||
54 | #include "dlmapi.h" | |
55 | ||
56 | #include "userdlm.h" | |
57 | ||
58 | #include "dlmfsver.h" | |
59 | ||
60 | #define MLOG_MASK_PREFIX ML_DLMFS | |
61 | #include "cluster/masklog.h" | |
62 | ||
ee9b6d61 | 63 | static const struct super_operations dlmfs_ops; |
00977a59 | 64 | static const struct file_operations dlmfs_file_operations; |
92e1d5be AV |
65 | static const struct inode_operations dlmfs_dir_inode_operations; |
66 | static const struct inode_operations dlmfs_root_inode_operations; | |
67 | static const struct inode_operations dlmfs_file_inode_operations; | |
e18b890b | 68 | static struct kmem_cache *dlmfs_inode_cache; |
8df08c89 MF |
69 | |
70 | struct workqueue_struct *user_dlm_worker; | |
71 | ||
72 | /* | |
73 | * decodes a set of open flags into a valid lock level and a set of flags. | |
74 | * returns < 0 if we have invalid flags | |
75 | * flags which mean something to us: | |
76 | * O_RDONLY -> PRMODE level | |
77 | * O_WRONLY -> EXMODE level | |
78 | * | |
79 | * O_NONBLOCK -> LKM_NOQUEUE | |
80 | */ | |
81 | static int dlmfs_decode_open_flags(int open_flags, | |
82 | int *level, | |
83 | int *flags) | |
84 | { | |
85 | if (open_flags & (O_WRONLY|O_RDWR)) | |
86 | *level = LKM_EXMODE; | |
87 | else | |
88 | *level = LKM_PRMODE; | |
89 | ||
90 | *flags = 0; | |
91 | if (open_flags & O_NONBLOCK) | |
92 | *flags |= LKM_NOQUEUE; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int dlmfs_file_open(struct inode *inode, | |
98 | struct file *file) | |
99 | { | |
100 | int status, level, flags; | |
101 | struct dlmfs_filp_private *fp = NULL; | |
102 | struct dlmfs_inode_private *ip; | |
103 | ||
104 | if (S_ISDIR(inode->i_mode)) | |
105 | BUG(); | |
106 | ||
107 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, | |
108 | file->f_flags); | |
109 | ||
110 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); | |
111 | if (status < 0) | |
112 | goto bail; | |
113 | ||
114 | /* We don't want to honor O_APPEND at read/write time as it | |
115 | * doesn't make sense for LVB writes. */ | |
116 | file->f_flags &= ~O_APPEND; | |
117 | ||
ad8100e0 | 118 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
8df08c89 MF |
119 | if (!fp) { |
120 | status = -ENOMEM; | |
121 | goto bail; | |
122 | } | |
123 | fp->fp_lock_level = level; | |
124 | ||
125 | ip = DLMFS_I(inode); | |
126 | ||
127 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); | |
128 | if (status < 0) { | |
129 | /* this is a strange error to return here but I want | |
130 | * to be able userspace to be able to distinguish a | |
131 | * valid lock request from one that simply couldn't be | |
132 | * granted. */ | |
133 | if (flags & LKM_NOQUEUE && status == -EAGAIN) | |
134 | status = -ETXTBSY; | |
135 | kfree(fp); | |
136 | goto bail; | |
137 | } | |
138 | ||
139 | file->private_data = fp; | |
140 | bail: | |
141 | return status; | |
142 | } | |
143 | ||
144 | static int dlmfs_file_release(struct inode *inode, | |
145 | struct file *file) | |
146 | { | |
147 | int level, status; | |
148 | struct dlmfs_inode_private *ip = DLMFS_I(inode); | |
149 | struct dlmfs_filp_private *fp = | |
150 | (struct dlmfs_filp_private *) file->private_data; | |
151 | ||
152 | if (S_ISDIR(inode->i_mode)) | |
153 | BUG(); | |
154 | ||
155 | mlog(0, "close called on inode %lu\n", inode->i_ino); | |
156 | ||
157 | status = 0; | |
158 | if (fp) { | |
159 | level = fp->fp_lock_level; | |
160 | if (level != LKM_IVMODE) | |
161 | user_dlm_cluster_unlock(&ip->ip_lockres, level); | |
162 | ||
163 | kfree(fp); | |
164 | file->private_data = NULL; | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static ssize_t dlmfs_file_read(struct file *filp, | |
171 | char __user *buf, | |
172 | size_t count, | |
173 | loff_t *ppos) | |
174 | { | |
175 | int bytes_left; | |
176 | ssize_t readlen; | |
177 | char *lvb_buf; | |
d28c9174 | 178 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
179 | |
180 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
181 | inode->i_ino, count, *ppos); | |
182 | ||
183 | if (*ppos >= i_size_read(inode)) | |
184 | return 0; | |
185 | ||
186 | if (!count) | |
187 | return 0; | |
188 | ||
189 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
190 | return -EFAULT; | |
191 | ||
192 | /* don't read past the lvb */ | |
193 | if ((count + *ppos) > i_size_read(inode)) | |
194 | readlen = i_size_read(inode) - *ppos; | |
195 | else | |
196 | readlen = count - *ppos; | |
197 | ||
ad8100e0 | 198 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
8df08c89 MF |
199 | if (!lvb_buf) |
200 | return -ENOMEM; | |
201 | ||
202 | user_dlm_read_lvb(inode, lvb_buf, readlen); | |
203 | bytes_left = __copy_to_user(buf, lvb_buf, readlen); | |
204 | readlen -= bytes_left; | |
205 | ||
206 | kfree(lvb_buf); | |
207 | ||
208 | *ppos = *ppos + readlen; | |
209 | ||
210 | mlog(0, "read %zd bytes\n", readlen); | |
211 | return readlen; | |
212 | } | |
213 | ||
214 | static ssize_t dlmfs_file_write(struct file *filp, | |
215 | const char __user *buf, | |
216 | size_t count, | |
217 | loff_t *ppos) | |
218 | { | |
219 | int bytes_left; | |
220 | ssize_t writelen; | |
221 | char *lvb_buf; | |
d28c9174 | 222 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
223 | |
224 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
225 | inode->i_ino, count, *ppos); | |
226 | ||
227 | if (*ppos >= i_size_read(inode)) | |
228 | return -ENOSPC; | |
229 | ||
230 | if (!count) | |
231 | return 0; | |
232 | ||
233 | if (!access_ok(VERIFY_READ, buf, count)) | |
234 | return -EFAULT; | |
235 | ||
236 | /* don't write past the lvb */ | |
237 | if ((count + *ppos) > i_size_read(inode)) | |
238 | writelen = i_size_read(inode) - *ppos; | |
239 | else | |
240 | writelen = count - *ppos; | |
241 | ||
ad8100e0 | 242 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
8df08c89 MF |
243 | if (!lvb_buf) |
244 | return -ENOMEM; | |
245 | ||
246 | bytes_left = copy_from_user(lvb_buf, buf, writelen); | |
247 | writelen -= bytes_left; | |
248 | if (writelen) | |
249 | user_dlm_write_lvb(inode, lvb_buf, writelen); | |
250 | ||
251 | kfree(lvb_buf); | |
252 | ||
253 | *ppos = *ppos + writelen; | |
254 | mlog(0, "wrote %zd bytes\n", writelen); | |
255 | return writelen; | |
256 | } | |
257 | ||
258 | static void dlmfs_init_once(void *foo, | |
e18b890b | 259 | struct kmem_cache *cachep, |
8df08c89 MF |
260 | unsigned long flags) |
261 | { | |
262 | struct dlmfs_inode_private *ip = | |
263 | (struct dlmfs_inode_private *) foo; | |
264 | ||
a35afb83 CL |
265 | ip->ip_dlm = NULL; |
266 | ip->ip_parent = NULL; | |
8df08c89 | 267 | |
a35afb83 | 268 | inode_init_once(&ip->ip_vfs_inode); |
8df08c89 MF |
269 | } |
270 | ||
271 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
272 | { | |
273 | struct dlmfs_inode_private *ip; | |
274 | ||
e6b4f8da | 275 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
276 | if (!ip) |
277 | return NULL; | |
278 | ||
279 | return &ip->ip_vfs_inode; | |
280 | } | |
281 | ||
282 | static void dlmfs_destroy_inode(struct inode *inode) | |
283 | { | |
284 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); | |
285 | } | |
286 | ||
287 | static void dlmfs_clear_inode(struct inode *inode) | |
288 | { | |
289 | int status; | |
290 | struct dlmfs_inode_private *ip; | |
291 | ||
292 | if (!inode) | |
293 | return; | |
294 | ||
295 | mlog(0, "inode %lu\n", inode->i_ino); | |
296 | ||
297 | ip = DLMFS_I(inode); | |
298 | ||
299 | if (S_ISREG(inode->i_mode)) { | |
300 | status = user_dlm_destroy_lock(&ip->ip_lockres); | |
301 | if (status < 0) | |
302 | mlog_errno(status); | |
303 | iput(ip->ip_parent); | |
304 | goto clear_fields; | |
305 | } | |
306 | ||
307 | mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm); | |
308 | /* we must be a directory. If required, lets unregister the | |
309 | * dlm context now. */ | |
310 | if (ip->ip_dlm) | |
311 | user_dlm_unregister_context(ip->ip_dlm); | |
312 | clear_fields: | |
313 | ip->ip_parent = NULL; | |
314 | ip->ip_dlm = NULL; | |
315 | } | |
316 | ||
317 | static struct backing_dev_info dlmfs_backing_dev_info = { | |
318 | .ra_pages = 0, /* No readahead */ | |
319 | .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, | |
320 | }; | |
321 | ||
322 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) | |
323 | { | |
324 | struct inode *inode = new_inode(sb); | |
325 | int mode = S_IFDIR | 0755; | |
326 | struct dlmfs_inode_private *ip; | |
327 | ||
328 | if (inode) { | |
329 | ip = DLMFS_I(inode); | |
330 | ||
331 | inode->i_mode = mode; | |
332 | inode->i_uid = current->fsuid; | |
333 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
334 | inode->i_blocks = 0; |
335 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
336 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
d8c76e6f | 337 | inc_nlink(inode); |
8df08c89 MF |
338 | |
339 | inode->i_fop = &simple_dir_operations; | |
340 | inode->i_op = &dlmfs_root_inode_operations; | |
341 | } | |
342 | ||
343 | return inode; | |
344 | } | |
345 | ||
346 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
347 | struct dentry *dentry, | |
348 | int mode) | |
349 | { | |
350 | struct super_block *sb = parent->i_sb; | |
351 | struct inode * inode = new_inode(sb); | |
352 | struct dlmfs_inode_private *ip; | |
353 | ||
354 | if (!inode) | |
355 | return NULL; | |
356 | ||
357 | inode->i_mode = mode; | |
358 | inode->i_uid = current->fsuid; | |
359 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
360 | inode->i_blocks = 0; |
361 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
362 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
363 | ||
364 | ip = DLMFS_I(inode); | |
365 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; | |
366 | ||
367 | switch (mode & S_IFMT) { | |
368 | default: | |
369 | /* for now we don't support anything other than | |
370 | * directories and regular files. */ | |
371 | BUG(); | |
372 | break; | |
373 | case S_IFREG: | |
374 | inode->i_op = &dlmfs_file_inode_operations; | |
375 | inode->i_fop = &dlmfs_file_operations; | |
376 | ||
377 | i_size_write(inode, DLM_LVB_LEN); | |
378 | ||
379 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
380 | ||
381 | /* released at clear_inode time, this insures that we | |
382 | * get to drop the dlm reference on each lock *before* | |
383 | * we call the unregister code for releasing parent | |
384 | * directories. */ | |
385 | ip->ip_parent = igrab(parent); | |
386 | BUG_ON(!ip->ip_parent); | |
387 | break; | |
388 | case S_IFDIR: | |
389 | inode->i_op = &dlmfs_dir_inode_operations; | |
390 | inode->i_fop = &simple_dir_operations; | |
391 | ||
392 | /* directory inodes start off with i_nlink == | |
393 | * 2 (for "." entry) */ | |
d8c76e6f | 394 | inc_nlink(inode); |
8df08c89 MF |
395 | break; |
396 | } | |
397 | ||
398 | if (parent->i_mode & S_ISGID) { | |
399 | inode->i_gid = parent->i_gid; | |
400 | if (S_ISDIR(mode)) | |
401 | inode->i_mode |= S_ISGID; | |
402 | } | |
403 | ||
404 | return inode; | |
405 | } | |
406 | ||
407 | /* | |
408 | * File creation. Allocate an inode, and we're done.. | |
409 | */ | |
410 | /* SMP-safe */ | |
411 | static int dlmfs_mkdir(struct inode * dir, | |
412 | struct dentry * dentry, | |
413 | int mode) | |
414 | { | |
415 | int status; | |
416 | struct inode *inode = NULL; | |
417 | struct qstr *domain = &dentry->d_name; | |
418 | struct dlmfs_inode_private *ip; | |
419 | struct dlm_ctxt *dlm; | |
420 | ||
421 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
422 | ||
423 | /* verify that we have a proper domain */ | |
424 | if (domain->len >= O2NM_MAX_NAME_LEN) { | |
425 | status = -EINVAL; | |
426 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
427 | goto bail; | |
428 | } | |
429 | ||
430 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
431 | if (!inode) { | |
432 | status = -ENOMEM; | |
433 | mlog_errno(status); | |
434 | goto bail; | |
435 | } | |
436 | ||
437 | ip = DLMFS_I(inode); | |
438 | ||
439 | dlm = user_dlm_register_context(domain); | |
440 | if (IS_ERR(dlm)) { | |
441 | status = PTR_ERR(dlm); | |
442 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", | |
443 | status, domain->len, domain->name); | |
444 | goto bail; | |
445 | } | |
446 | ip->ip_dlm = dlm; | |
447 | ||
d8c76e6f | 448 | inc_nlink(dir); |
8df08c89 MF |
449 | d_instantiate(dentry, inode); |
450 | dget(dentry); /* Extra count - pin the dentry in core */ | |
451 | ||
452 | status = 0; | |
453 | bail: | |
454 | if (status < 0) | |
455 | iput(inode); | |
456 | return status; | |
457 | } | |
458 | ||
459 | static int dlmfs_create(struct inode *dir, | |
460 | struct dentry *dentry, | |
461 | int mode, | |
462 | struct nameidata *nd) | |
463 | { | |
464 | int status = 0; | |
465 | struct inode *inode; | |
466 | struct qstr *name = &dentry->d_name; | |
467 | ||
468 | mlog(0, "create %.*s\n", name->len, name->name); | |
469 | ||
470 | /* verify name is valid and doesn't contain any dlm reserved | |
471 | * characters */ | |
472 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
473 | name->name[0] == '$') { | |
474 | status = -EINVAL; | |
475 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
476 | name->name); | |
477 | goto bail; | |
478 | } | |
479 | ||
480 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
481 | if (!inode) { | |
482 | status = -ENOMEM; | |
483 | mlog_errno(status); | |
484 | goto bail; | |
485 | } | |
486 | ||
487 | d_instantiate(dentry, inode); | |
488 | dget(dentry); /* Extra count - pin the dentry in core */ | |
489 | bail: | |
490 | return status; | |
491 | } | |
492 | ||
493 | static int dlmfs_unlink(struct inode *dir, | |
494 | struct dentry *dentry) | |
495 | { | |
496 | int status; | |
497 | struct inode *inode = dentry->d_inode; | |
498 | ||
499 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
500 | ||
501 | /* if there are no current holders, or none that are waiting | |
502 | * to acquire a lock, this basically destroys our lockres. */ | |
503 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
504 | if (status < 0) { | |
505 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", | |
506 | dentry->d_name.len, dentry->d_name.name, status); | |
507 | goto bail; | |
508 | } | |
509 | status = simple_unlink(dir, dentry); | |
510 | bail: | |
511 | return status; | |
512 | } | |
513 | ||
514 | static int dlmfs_fill_super(struct super_block * sb, | |
515 | void * data, | |
516 | int silent) | |
517 | { | |
518 | struct inode * inode; | |
519 | struct dentry * root; | |
520 | ||
521 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
522 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
523 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
524 | sb->s_magic = DLMFS_MAGIC; | |
525 | sb->s_op = &dlmfs_ops; | |
526 | inode = dlmfs_get_root_inode(sb); | |
527 | if (!inode) | |
528 | return -ENOMEM; | |
529 | ||
530 | root = d_alloc_root(inode); | |
531 | if (!root) { | |
532 | iput(inode); | |
533 | return -ENOMEM; | |
534 | } | |
535 | sb->s_root = root; | |
536 | return 0; | |
537 | } | |
538 | ||
00977a59 | 539 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
540 | .open = dlmfs_file_open, |
541 | .release = dlmfs_file_release, | |
542 | .read = dlmfs_file_read, | |
543 | .write = dlmfs_file_write, | |
544 | }; | |
545 | ||
92e1d5be | 546 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
547 | .create = dlmfs_create, |
548 | .lookup = simple_lookup, | |
549 | .unlink = dlmfs_unlink, | |
550 | }; | |
551 | ||
552 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 553 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
554 | .lookup = simple_lookup, |
555 | .mkdir = dlmfs_mkdir, | |
556 | .rmdir = simple_rmdir, | |
557 | }; | |
558 | ||
ee9b6d61 | 559 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
560 | .statfs = simple_statfs, |
561 | .alloc_inode = dlmfs_alloc_inode, | |
562 | .destroy_inode = dlmfs_destroy_inode, | |
563 | .clear_inode = dlmfs_clear_inode, | |
564 | .drop_inode = generic_delete_inode, | |
565 | }; | |
566 | ||
92e1d5be | 567 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 MF |
568 | .getattr = simple_getattr, |
569 | }; | |
570 | ||
454e2398 DH |
571 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
572 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
8df08c89 | 573 | { |
454e2398 | 574 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
8df08c89 MF |
575 | } |
576 | ||
577 | static struct file_system_type dlmfs_fs_type = { | |
578 | .owner = THIS_MODULE, | |
579 | .name = "ocfs2_dlmfs", | |
580 | .get_sb = dlmfs_get_sb, | |
581 | .kill_sb = kill_litter_super, | |
582 | }; | |
583 | ||
584 | static int __init init_dlmfs_fs(void) | |
585 | { | |
586 | int status; | |
587 | int cleanup_inode = 0, cleanup_worker = 0; | |
588 | ||
589 | dlmfs_print_version(); | |
590 | ||
591 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", | |
592 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 PJ |
593 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
594 | SLAB_MEM_SPREAD), | |
8df08c89 MF |
595 | dlmfs_init_once, NULL); |
596 | if (!dlmfs_inode_cache) | |
597 | return -ENOMEM; | |
598 | cleanup_inode = 1; | |
599 | ||
600 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); | |
601 | if (!user_dlm_worker) { | |
602 | status = -ENOMEM; | |
603 | goto bail; | |
604 | } | |
605 | cleanup_worker = 1; | |
606 | ||
607 | status = register_filesystem(&dlmfs_fs_type); | |
608 | bail: | |
609 | if (status) { | |
610 | if (cleanup_inode) | |
611 | kmem_cache_destroy(dlmfs_inode_cache); | |
612 | if (cleanup_worker) | |
613 | destroy_workqueue(user_dlm_worker); | |
614 | } else | |
615 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
616 | return status; | |
617 | } | |
618 | ||
619 | static void __exit exit_dlmfs_fs(void) | |
620 | { | |
621 | unregister_filesystem(&dlmfs_fs_type); | |
622 | ||
623 | flush_workqueue(user_dlm_worker); | |
624 | destroy_workqueue(user_dlm_worker); | |
625 | ||
1a1d92c1 | 626 | kmem_cache_destroy(dlmfs_inode_cache); |
8df08c89 MF |
627 | } |
628 | ||
629 | MODULE_AUTHOR("Oracle"); | |
630 | MODULE_LICENSE("GPL"); | |
631 | ||
632 | module_init(init_dlmfs_fs) | |
633 | module_exit(exit_dlmfs_fs) |