blob: 1c9efb406a96b98a36fa5ae5450198b6e8e8a067 [file] [log] [blame]
Mark Fasheh8df08c82005-12-15 14:31:23 -08001/* -*- 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>
Mark Fasheh8df08c82005-12-15 14:31:23 -080045#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
Joel Beckerd24fbcd2008-01-25 17:02:21 -080063#include "ocfs2_lockingver.h"
64
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080065static const struct super_operations dlmfs_ops;
Arjan van de Ven00977a52007-02-12 00:55:34 -080066static const struct file_operations dlmfs_file_operations;
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080067static const struct inode_operations dlmfs_dir_inode_operations;
68static const struct inode_operations dlmfs_root_inode_operations;
69static const struct inode_operations dlmfs_file_inode_operations;
Christoph Lametere18b8902006-12-06 20:33:20 -080070static struct kmem_cache *dlmfs_inode_cache;
Mark Fasheh8df08c82005-12-15 14:31:23 -080071
72struct workqueue_struct *user_dlm_worker;
73
74/*
Joel Beckerd24fbcd2008-01-25 17:02:21 -080075 * This is the userdlmfs locking protocol version.
76 *
77 * See fs/ocfs2/dlmglue.c for more details on locking versions.
78 */
79static const struct dlm_protocol_version user_locking_protocol = {
80 .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
81 .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
82};
83
84/*
Mark Fasheh8df08c82005-12-15 14:31:23 -080085 * decodes a set of open flags into a valid lock level and a set of flags.
86 * returns < 0 if we have invalid flags
87 * flags which mean something to us:
88 * O_RDONLY -> PRMODE level
89 * O_WRONLY -> EXMODE level
90 *
91 * O_NONBLOCK -> LKM_NOQUEUE
92 */
93static int dlmfs_decode_open_flags(int open_flags,
94 int *level,
95 int *flags)
96{
97 if (open_flags & (O_WRONLY|O_RDWR))
98 *level = LKM_EXMODE;
99 else
100 *level = LKM_PRMODE;
101
102 *flags = 0;
103 if (open_flags & O_NONBLOCK)
104 *flags |= LKM_NOQUEUE;
105
106 return 0;
107}
108
109static int dlmfs_file_open(struct inode *inode,
110 struct file *file)
111{
112 int status, level, flags;
113 struct dlmfs_filp_private *fp = NULL;
114 struct dlmfs_inode_private *ip;
115
116 if (S_ISDIR(inode->i_mode))
117 BUG();
118
119 mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
120 file->f_flags);
121
122 status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
123 if (status < 0)
124 goto bail;
125
126 /* We don't want to honor O_APPEND at read/write time as it
127 * doesn't make sense for LVB writes. */
128 file->f_flags &= ~O_APPEND;
129
Kurt Hackelad8100e2006-05-01 14:25:21 -0700130 fp = kmalloc(sizeof(*fp), GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800131 if (!fp) {
132 status = -ENOMEM;
133 goto bail;
134 }
135 fp->fp_lock_level = level;
136
137 ip = DLMFS_I(inode);
138
139 status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
140 if (status < 0) {
141 /* this is a strange error to return here but I want
142 * to be able userspace to be able to distinguish a
143 * valid lock request from one that simply couldn't be
144 * granted. */
145 if (flags & LKM_NOQUEUE && status == -EAGAIN)
146 status = -ETXTBSY;
147 kfree(fp);
148 goto bail;
149 }
150
151 file->private_data = fp;
152bail:
153 return status;
154}
155
156static int dlmfs_file_release(struct inode *inode,
157 struct file *file)
158{
159 int level, status;
160 struct dlmfs_inode_private *ip = DLMFS_I(inode);
161 struct dlmfs_filp_private *fp =
162 (struct dlmfs_filp_private *) file->private_data;
163
164 if (S_ISDIR(inode->i_mode))
165 BUG();
166
167 mlog(0, "close called on inode %lu\n", inode->i_ino);
168
169 status = 0;
170 if (fp) {
171 level = fp->fp_lock_level;
172 if (level != LKM_IVMODE)
173 user_dlm_cluster_unlock(&ip->ip_lockres, level);
174
175 kfree(fp);
176 file->private_data = NULL;
177 }
178
179 return 0;
180}
181
182static ssize_t dlmfs_file_read(struct file *filp,
183 char __user *buf,
184 size_t count,
185 loff_t *ppos)
186{
187 int bytes_left;
188 ssize_t readlen;
189 char *lvb_buf;
Josef Sipekd28c9172006-12-08 02:37:25 -0800190 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800191
192 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
193 inode->i_ino, count, *ppos);
194
195 if (*ppos >= i_size_read(inode))
196 return 0;
197
198 if (!count)
199 return 0;
200
201 if (!access_ok(VERIFY_WRITE, buf, count))
202 return -EFAULT;
203
204 /* don't read past the lvb */
205 if ((count + *ppos) > i_size_read(inode))
206 readlen = i_size_read(inode) - *ppos;
207 else
208 readlen = count - *ppos;
209
Kurt Hackelad8100e2006-05-01 14:25:21 -0700210 lvb_buf = kmalloc(readlen, GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800211 if (!lvb_buf)
212 return -ENOMEM;
213
214 user_dlm_read_lvb(inode, lvb_buf, readlen);
215 bytes_left = __copy_to_user(buf, lvb_buf, readlen);
216 readlen -= bytes_left;
217
218 kfree(lvb_buf);
219
220 *ppos = *ppos + readlen;
221
222 mlog(0, "read %zd bytes\n", readlen);
223 return readlen;
224}
225
226static ssize_t dlmfs_file_write(struct file *filp,
227 const char __user *buf,
228 size_t count,
229 loff_t *ppos)
230{
231 int bytes_left;
232 ssize_t writelen;
233 char *lvb_buf;
Josef Sipekd28c9172006-12-08 02:37:25 -0800234 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800235
236 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
237 inode->i_ino, count, *ppos);
238
239 if (*ppos >= i_size_read(inode))
240 return -ENOSPC;
241
242 if (!count)
243 return 0;
244
245 if (!access_ok(VERIFY_READ, buf, count))
246 return -EFAULT;
247
248 /* don't write past the lvb */
249 if ((count + *ppos) > i_size_read(inode))
250 writelen = i_size_read(inode) - *ppos;
251 else
252 writelen = count - *ppos;
253
Kurt Hackelad8100e2006-05-01 14:25:21 -0700254 lvb_buf = kmalloc(writelen, GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800255 if (!lvb_buf)
256 return -ENOMEM;
257
258 bytes_left = copy_from_user(lvb_buf, buf, writelen);
259 writelen -= bytes_left;
260 if (writelen)
261 user_dlm_write_lvb(inode, lvb_buf, writelen);
262
263 kfree(lvb_buf);
264
265 *ppos = *ppos + writelen;
266 mlog(0, "wrote %zd bytes\n", writelen);
267 return writelen;
268}
269
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700270static void dlmfs_init_once(void *foo)
Mark Fasheh8df08c82005-12-15 14:31:23 -0800271{
272 struct dlmfs_inode_private *ip =
273 (struct dlmfs_inode_private *) foo;
274
Christoph Lametera35afb82007-05-16 22:10:57 -0700275 ip->ip_dlm = NULL;
276 ip->ip_parent = NULL;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800277
Christoph Lametera35afb82007-05-16 22:10:57 -0700278 inode_init_once(&ip->ip_vfs_inode);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800279}
280
281static struct inode *dlmfs_alloc_inode(struct super_block *sb)
282{
283 struct dlmfs_inode_private *ip;
284
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800285 ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800286 if (!ip)
287 return NULL;
288
289 return &ip->ip_vfs_inode;
290}
291
292static void dlmfs_destroy_inode(struct inode *inode)
293{
294 kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
295}
296
297static void dlmfs_clear_inode(struct inode *inode)
298{
299 int status;
300 struct dlmfs_inode_private *ip;
301
302 if (!inode)
303 return;
304
305 mlog(0, "inode %lu\n", inode->i_ino);
306
307 ip = DLMFS_I(inode);
308
309 if (S_ISREG(inode->i_mode)) {
310 status = user_dlm_destroy_lock(&ip->ip_lockres);
311 if (status < 0)
312 mlog_errno(status);
313 iput(ip->ip_parent);
314 goto clear_fields;
315 }
316
317 mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
318 /* we must be a directory. If required, lets unregister the
319 * dlm context now. */
320 if (ip->ip_dlm)
321 user_dlm_unregister_context(ip->ip_dlm);
322clear_fields:
323 ip->ip_parent = NULL;
324 ip->ip_dlm = NULL;
325}
326
327static struct backing_dev_info dlmfs_backing_dev_info = {
328 .ra_pages = 0, /* No readahead */
Miklos Szeredie4ad08f2008-04-30 00:54:37 -0700329 .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
Mark Fasheh8df08c82005-12-15 14:31:23 -0800330};
331
332static struct inode *dlmfs_get_root_inode(struct super_block *sb)
333{
334 struct inode *inode = new_inode(sb);
335 int mode = S_IFDIR | 0755;
336 struct dlmfs_inode_private *ip;
337
338 if (inode) {
339 ip = DLMFS_I(inode);
340
341 inode->i_mode = mode;
David Howellsb19c2a32008-11-14 10:38:59 +1100342 inode->i_uid = current_fsuid();
343 inode->i_gid = current_fsgid();
Mark Fasheh8df08c82005-12-15 14:31:23 -0800344 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
345 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Dave Hansend8c76e62006-09-30 23:29:04 -0700346 inc_nlink(inode);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800347
348 inode->i_fop = &simple_dir_operations;
349 inode->i_op = &dlmfs_root_inode_operations;
350 }
351
352 return inode;
353}
354
355static struct inode *dlmfs_get_inode(struct inode *parent,
356 struct dentry *dentry,
357 int mode)
358{
359 struct super_block *sb = parent->i_sb;
360 struct inode * inode = new_inode(sb);
361 struct dlmfs_inode_private *ip;
362
363 if (!inode)
364 return NULL;
365
366 inode->i_mode = mode;
David Howellsb19c2a32008-11-14 10:38:59 +1100367 inode->i_uid = current_fsuid();
368 inode->i_gid = current_fsgid();
Mark Fasheh8df08c82005-12-15 14:31:23 -0800369 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
370 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
371
372 ip = DLMFS_I(inode);
373 ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
374
375 switch (mode & S_IFMT) {
376 default:
377 /* for now we don't support anything other than
378 * directories and regular files. */
379 BUG();
380 break;
381 case S_IFREG:
382 inode->i_op = &dlmfs_file_inode_operations;
383 inode->i_fop = &dlmfs_file_operations;
384
385 i_size_write(inode, DLM_LVB_LEN);
386
387 user_dlm_lock_res_init(&ip->ip_lockres, dentry);
388
389 /* released at clear_inode time, this insures that we
390 * get to drop the dlm reference on each lock *before*
391 * we call the unregister code for releasing parent
392 * directories. */
393 ip->ip_parent = igrab(parent);
394 BUG_ON(!ip->ip_parent);
395 break;
396 case S_IFDIR:
397 inode->i_op = &dlmfs_dir_inode_operations;
398 inode->i_fop = &simple_dir_operations;
399
400 /* directory inodes start off with i_nlink ==
401 * 2 (for "." entry) */
Dave Hansend8c76e62006-09-30 23:29:04 -0700402 inc_nlink(inode);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800403 break;
404 }
405
406 if (parent->i_mode & S_ISGID) {
407 inode->i_gid = parent->i_gid;
408 if (S_ISDIR(mode))
409 inode->i_mode |= S_ISGID;
410 }
411
412 return inode;
413}
414
415/*
416 * File creation. Allocate an inode, and we're done..
417 */
418/* SMP-safe */
419static int dlmfs_mkdir(struct inode * dir,
420 struct dentry * dentry,
421 int mode)
422{
423 int status;
424 struct inode *inode = NULL;
425 struct qstr *domain = &dentry->d_name;
426 struct dlmfs_inode_private *ip;
427 struct dlm_ctxt *dlm;
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800428 struct dlm_protocol_version proto = user_locking_protocol;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800429
430 mlog(0, "mkdir %.*s\n", domain->len, domain->name);
431
432 /* verify that we have a proper domain */
433 if (domain->len >= O2NM_MAX_NAME_LEN) {
434 status = -EINVAL;
435 mlog(ML_ERROR, "invalid domain name for directory.\n");
436 goto bail;
437 }
438
439 inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
440 if (!inode) {
441 status = -ENOMEM;
442 mlog_errno(status);
443 goto bail;
444 }
445
446 ip = DLMFS_I(inode);
447
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800448 dlm = user_dlm_register_context(domain, &proto);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800449 if (IS_ERR(dlm)) {
450 status = PTR_ERR(dlm);
451 mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
452 status, domain->len, domain->name);
453 goto bail;
454 }
455 ip->ip_dlm = dlm;
456
Dave Hansend8c76e62006-09-30 23:29:04 -0700457 inc_nlink(dir);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800458 d_instantiate(dentry, inode);
459 dget(dentry); /* Extra count - pin the dentry in core */
460
461 status = 0;
462bail:
463 if (status < 0)
464 iput(inode);
465 return status;
466}
467
468static int dlmfs_create(struct inode *dir,
469 struct dentry *dentry,
470 int mode,
471 struct nameidata *nd)
472{
473 int status = 0;
474 struct inode *inode;
475 struct qstr *name = &dentry->d_name;
476
477 mlog(0, "create %.*s\n", name->len, name->name);
478
479 /* verify name is valid and doesn't contain any dlm reserved
480 * characters */
481 if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
482 name->name[0] == '$') {
483 status = -EINVAL;
484 mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
485 name->name);
486 goto bail;
487 }
488
489 inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
490 if (!inode) {
491 status = -ENOMEM;
492 mlog_errno(status);
493 goto bail;
494 }
495
496 d_instantiate(dentry, inode);
497 dget(dentry); /* Extra count - pin the dentry in core */
498bail:
499 return status;
500}
501
502static int dlmfs_unlink(struct inode *dir,
503 struct dentry *dentry)
504{
505 int status;
506 struct inode *inode = dentry->d_inode;
507
508 mlog(0, "unlink inode %lu\n", inode->i_ino);
509
510 /* if there are no current holders, or none that are waiting
511 * to acquire a lock, this basically destroys our lockres. */
512 status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
513 if (status < 0) {
514 mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
515 dentry->d_name.len, dentry->d_name.name, status);
516 goto bail;
517 }
518 status = simple_unlink(dir, dentry);
519bail:
520 return status;
521}
522
523static int dlmfs_fill_super(struct super_block * sb,
524 void * data,
525 int silent)
526{
527 struct inode * inode;
528 struct dentry * root;
529
530 sb->s_maxbytes = MAX_LFS_FILESIZE;
531 sb->s_blocksize = PAGE_CACHE_SIZE;
532 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
533 sb->s_magic = DLMFS_MAGIC;
534 sb->s_op = &dlmfs_ops;
535 inode = dlmfs_get_root_inode(sb);
536 if (!inode)
537 return -ENOMEM;
538
539 root = d_alloc_root(inode);
540 if (!root) {
541 iput(inode);
542 return -ENOMEM;
543 }
544 sb->s_root = root;
545 return 0;
546}
547
Arjan van de Ven00977a52007-02-12 00:55:34 -0800548static const struct file_operations dlmfs_file_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800549 .open = dlmfs_file_open,
550 .release = dlmfs_file_release,
551 .read = dlmfs_file_read,
552 .write = dlmfs_file_write,
553};
554
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800555static const struct inode_operations dlmfs_dir_inode_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800556 .create = dlmfs_create,
557 .lookup = simple_lookup,
558 .unlink = dlmfs_unlink,
559};
560
561/* this way we can restrict mkdir to only the toplevel of the fs. */
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800562static const struct inode_operations dlmfs_root_inode_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800563 .lookup = simple_lookup,
564 .mkdir = dlmfs_mkdir,
565 .rmdir = simple_rmdir,
566};
567
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800568static const struct super_operations dlmfs_ops = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800569 .statfs = simple_statfs,
570 .alloc_inode = dlmfs_alloc_inode,
571 .destroy_inode = dlmfs_destroy_inode,
572 .clear_inode = dlmfs_clear_inode,
573 .drop_inode = generic_delete_inode,
574};
575
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800576static const struct inode_operations dlmfs_file_inode_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800577 .getattr = simple_getattr,
578};
579
David Howells454e2392006-06-23 02:02:57 -0700580static int dlmfs_get_sb(struct file_system_type *fs_type,
581 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Mark Fasheh8df08c82005-12-15 14:31:23 -0800582{
David Howells454e2392006-06-23 02:02:57 -0700583 return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800584}
585
586static struct file_system_type dlmfs_fs_type = {
587 .owner = THIS_MODULE,
588 .name = "ocfs2_dlmfs",
589 .get_sb = dlmfs_get_sb,
590 .kill_sb = kill_litter_super,
591};
592
593static int __init init_dlmfs_fs(void)
594{
595 int status;
596 int cleanup_inode = 0, cleanup_worker = 0;
597
598 dlmfs_print_version();
599
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700600 status = bdi_init(&dlmfs_backing_dev_info);
601 if (status)
602 return status;
603
Mark Fasheh8df08c82005-12-15 14:31:23 -0800604 dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
605 sizeof(struct dlmfs_inode_private),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800606 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
607 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900608 dlmfs_init_once);
Coly Li07d9a392008-11-17 12:38:22 +0800609 if (!dlmfs_inode_cache) {
610 status = -ENOMEM;
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700611 goto bail;
Coly Li07d9a392008-11-17 12:38:22 +0800612 }
Mark Fasheh8df08c82005-12-15 14:31:23 -0800613 cleanup_inode = 1;
614
615 user_dlm_worker = create_singlethread_workqueue("user_dlm");
616 if (!user_dlm_worker) {
617 status = -ENOMEM;
618 goto bail;
619 }
620 cleanup_worker = 1;
621
622 status = register_filesystem(&dlmfs_fs_type);
623bail:
624 if (status) {
625 if (cleanup_inode)
626 kmem_cache_destroy(dlmfs_inode_cache);
627 if (cleanup_worker)
628 destroy_workqueue(user_dlm_worker);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700629 bdi_destroy(&dlmfs_backing_dev_info);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800630 } else
631 printk("OCFS2 User DLM kernel interface loaded\n");
632 return status;
633}
634
635static void __exit exit_dlmfs_fs(void)
636{
637 unregister_filesystem(&dlmfs_fs_type);
638
639 flush_workqueue(user_dlm_worker);
640 destroy_workqueue(user_dlm_worker);
641
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700642 kmem_cache_destroy(dlmfs_inode_cache);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700643
644 bdi_destroy(&dlmfs_backing_dev_info);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800645}
646
647MODULE_AUTHOR("Oracle");
648MODULE_LICENSE("GPL");
649
650module_init(init_dlmfs_fs)
651module_exit(exit_dlmfs_fs)