blob: 77d0df42fe0267be0b9f36b413d20e4c1e89328e [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
Joel Becker14a437c2010-02-04 15:37:27 -080084
85/*
86 * These are the ABI capabilities of dlmfs.
87 *
88 * Over time, dlmfs has added some features that were not part of the
89 * initial ABI. Unfortunately, some of these features are not detectable
90 * via standard usage. For example, Linux's default poll always returns
91 * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs
92 * added poll support. Instead, we provide this list of new capabilities.
93 *
94 * Capabilities is a read-only attribute. We do it as a module parameter
95 * so we can discover it whether dlmfs is built in, loaded, or even not
96 * loaded.
97 *
98 * The ABI features are local to this machine's dlmfs mount. This is
99 * distinct from the locking protocol, which is concerned with inter-node
100 * interaction.
101 */
102#define DLMFS_CAPABILITIES ""
103extern int param_set_dlmfs_capabilities(const char *val,
104 struct kernel_param *kp)
105{
106 printk(KERN_ERR "%s: readonly parameter\n", kp->name);
107 return -EINVAL;
108}
109static int param_get_dlmfs_capabilities(char *buffer,
110 struct kernel_param *kp)
111{
112 return strlcpy(buffer, DLMFS_CAPABILITIES,
113 strlen(DLMFS_CAPABILITIES) + 1);
114}
115module_param_call(capabilities, param_set_dlmfs_capabilities,
116 param_get_dlmfs_capabilities, NULL, 0444);
117MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES);
118
119
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800120/*
Mark Fasheh8df08c82005-12-15 14:31:23 -0800121 * decodes a set of open flags into a valid lock level and a set of flags.
122 * returns < 0 if we have invalid flags
123 * flags which mean something to us:
124 * O_RDONLY -> PRMODE level
125 * O_WRONLY -> EXMODE level
126 *
127 * O_NONBLOCK -> LKM_NOQUEUE
128 */
129static int dlmfs_decode_open_flags(int open_flags,
130 int *level,
131 int *flags)
132{
133 if (open_flags & (O_WRONLY|O_RDWR))
134 *level = LKM_EXMODE;
135 else
136 *level = LKM_PRMODE;
137
138 *flags = 0;
139 if (open_flags & O_NONBLOCK)
140 *flags |= LKM_NOQUEUE;
141
142 return 0;
143}
144
145static int dlmfs_file_open(struct inode *inode,
146 struct file *file)
147{
148 int status, level, flags;
149 struct dlmfs_filp_private *fp = NULL;
150 struct dlmfs_inode_private *ip;
151
152 if (S_ISDIR(inode->i_mode))
153 BUG();
154
155 mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino,
156 file->f_flags);
157
158 status = dlmfs_decode_open_flags(file->f_flags, &level, &flags);
159 if (status < 0)
160 goto bail;
161
162 /* We don't want to honor O_APPEND at read/write time as it
163 * doesn't make sense for LVB writes. */
164 file->f_flags &= ~O_APPEND;
165
Kurt Hackelad8100e2006-05-01 14:25:21 -0700166 fp = kmalloc(sizeof(*fp), GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800167 if (!fp) {
168 status = -ENOMEM;
169 goto bail;
170 }
171 fp->fp_lock_level = level;
172
173 ip = DLMFS_I(inode);
174
175 status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags);
176 if (status < 0) {
177 /* this is a strange error to return here but I want
178 * to be able userspace to be able to distinguish a
179 * valid lock request from one that simply couldn't be
180 * granted. */
181 if (flags & LKM_NOQUEUE && status == -EAGAIN)
182 status = -ETXTBSY;
183 kfree(fp);
184 goto bail;
185 }
186
187 file->private_data = fp;
188bail:
189 return status;
190}
191
192static int dlmfs_file_release(struct inode *inode,
193 struct file *file)
194{
195 int level, status;
196 struct dlmfs_inode_private *ip = DLMFS_I(inode);
197 struct dlmfs_filp_private *fp =
198 (struct dlmfs_filp_private *) file->private_data;
199
200 if (S_ISDIR(inode->i_mode))
201 BUG();
202
203 mlog(0, "close called on inode %lu\n", inode->i_ino);
204
205 status = 0;
206 if (fp) {
207 level = fp->fp_lock_level;
208 if (level != LKM_IVMODE)
209 user_dlm_cluster_unlock(&ip->ip_lockres, level);
210
211 kfree(fp);
212 file->private_data = NULL;
213 }
214
215 return 0;
216}
217
218static ssize_t dlmfs_file_read(struct file *filp,
219 char __user *buf,
220 size_t count,
221 loff_t *ppos)
222{
223 int bytes_left;
224 ssize_t readlen;
225 char *lvb_buf;
Josef Sipekd28c9172006-12-08 02:37:25 -0800226 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800227
228 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
229 inode->i_ino, count, *ppos);
230
231 if (*ppos >= i_size_read(inode))
232 return 0;
233
234 if (!count)
235 return 0;
236
237 if (!access_ok(VERIFY_WRITE, buf, count))
238 return -EFAULT;
239
240 /* don't read past the lvb */
241 if ((count + *ppos) > i_size_read(inode))
242 readlen = i_size_read(inode) - *ppos;
243 else
244 readlen = count - *ppos;
245
Kurt Hackelad8100e2006-05-01 14:25:21 -0700246 lvb_buf = kmalloc(readlen, GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800247 if (!lvb_buf)
248 return -ENOMEM;
249
250 user_dlm_read_lvb(inode, lvb_buf, readlen);
251 bytes_left = __copy_to_user(buf, lvb_buf, readlen);
252 readlen -= bytes_left;
253
254 kfree(lvb_buf);
255
256 *ppos = *ppos + readlen;
257
258 mlog(0, "read %zd bytes\n", readlen);
259 return readlen;
260}
261
262static ssize_t dlmfs_file_write(struct file *filp,
263 const char __user *buf,
264 size_t count,
265 loff_t *ppos)
266{
267 int bytes_left;
268 ssize_t writelen;
269 char *lvb_buf;
Josef Sipekd28c9172006-12-08 02:37:25 -0800270 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800271
272 mlog(0, "inode %lu, count = %zu, *ppos = %llu\n",
273 inode->i_ino, count, *ppos);
274
275 if (*ppos >= i_size_read(inode))
276 return -ENOSPC;
277
278 if (!count)
279 return 0;
280
281 if (!access_ok(VERIFY_READ, buf, count))
282 return -EFAULT;
283
284 /* don't write past the lvb */
285 if ((count + *ppos) > i_size_read(inode))
286 writelen = i_size_read(inode) - *ppos;
287 else
288 writelen = count - *ppos;
289
Kurt Hackelad8100e2006-05-01 14:25:21 -0700290 lvb_buf = kmalloc(writelen, GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800291 if (!lvb_buf)
292 return -ENOMEM;
293
294 bytes_left = copy_from_user(lvb_buf, buf, writelen);
295 writelen -= bytes_left;
296 if (writelen)
297 user_dlm_write_lvb(inode, lvb_buf, writelen);
298
299 kfree(lvb_buf);
300
301 *ppos = *ppos + writelen;
302 mlog(0, "wrote %zd bytes\n", writelen);
303 return writelen;
304}
305
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700306static void dlmfs_init_once(void *foo)
Mark Fasheh8df08c82005-12-15 14:31:23 -0800307{
308 struct dlmfs_inode_private *ip =
309 (struct dlmfs_inode_private *) foo;
310
Christoph Lametera35afb82007-05-16 22:10:57 -0700311 ip->ip_dlm = NULL;
312 ip->ip_parent = NULL;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800313
Christoph Lametera35afb82007-05-16 22:10:57 -0700314 inode_init_once(&ip->ip_vfs_inode);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800315}
316
317static struct inode *dlmfs_alloc_inode(struct super_block *sb)
318{
319 struct dlmfs_inode_private *ip;
320
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800321 ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800322 if (!ip)
323 return NULL;
324
325 return &ip->ip_vfs_inode;
326}
327
328static void dlmfs_destroy_inode(struct inode *inode)
329{
330 kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
331}
332
333static void dlmfs_clear_inode(struct inode *inode)
334{
335 int status;
336 struct dlmfs_inode_private *ip;
337
338 if (!inode)
339 return;
340
341 mlog(0, "inode %lu\n", inode->i_ino);
342
343 ip = DLMFS_I(inode);
344
345 if (S_ISREG(inode->i_mode)) {
346 status = user_dlm_destroy_lock(&ip->ip_lockres);
347 if (status < 0)
348 mlog_errno(status);
349 iput(ip->ip_parent);
350 goto clear_fields;
351 }
352
353 mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm);
354 /* we must be a directory. If required, lets unregister the
355 * dlm context now. */
356 if (ip->ip_dlm)
357 user_dlm_unregister_context(ip->ip_dlm);
358clear_fields:
359 ip->ip_parent = NULL;
360 ip->ip_dlm = NULL;
361}
362
363static struct backing_dev_info dlmfs_backing_dev_info = {
Jens Axboed9938312009-06-12 14:45:52 +0200364 .name = "ocfs2-dlmfs",
Mark Fasheh8df08c82005-12-15 14:31:23 -0800365 .ra_pages = 0, /* No readahead */
Miklos Szeredie4ad08f2008-04-30 00:54:37 -0700366 .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
Mark Fasheh8df08c82005-12-15 14:31:23 -0800367};
368
369static struct inode *dlmfs_get_root_inode(struct super_block *sb)
370{
371 struct inode *inode = new_inode(sb);
372 int mode = S_IFDIR | 0755;
373 struct dlmfs_inode_private *ip;
374
375 if (inode) {
376 ip = DLMFS_I(inode);
377
378 inode->i_mode = mode;
David Howellsb19c2a32008-11-14 10:38:59 +1100379 inode->i_uid = current_fsuid();
380 inode->i_gid = current_fsgid();
Mark Fasheh8df08c82005-12-15 14:31:23 -0800381 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
382 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Dave Hansend8c76e62006-09-30 23:29:04 -0700383 inc_nlink(inode);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800384
385 inode->i_fop = &simple_dir_operations;
386 inode->i_op = &dlmfs_root_inode_operations;
387 }
388
389 return inode;
390}
391
392static struct inode *dlmfs_get_inode(struct inode *parent,
393 struct dentry *dentry,
394 int mode)
395{
396 struct super_block *sb = parent->i_sb;
397 struct inode * inode = new_inode(sb);
398 struct dlmfs_inode_private *ip;
399
400 if (!inode)
401 return NULL;
402
403 inode->i_mode = mode;
David Howellsb19c2a32008-11-14 10:38:59 +1100404 inode->i_uid = current_fsuid();
405 inode->i_gid = current_fsgid();
Mark Fasheh8df08c82005-12-15 14:31:23 -0800406 inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
407 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
408
409 ip = DLMFS_I(inode);
410 ip->ip_dlm = DLMFS_I(parent)->ip_dlm;
411
412 switch (mode & S_IFMT) {
413 default:
414 /* for now we don't support anything other than
415 * directories and regular files. */
416 BUG();
417 break;
418 case S_IFREG:
419 inode->i_op = &dlmfs_file_inode_operations;
420 inode->i_fop = &dlmfs_file_operations;
421
422 i_size_write(inode, DLM_LVB_LEN);
423
424 user_dlm_lock_res_init(&ip->ip_lockres, dentry);
425
426 /* released at clear_inode time, this insures that we
427 * get to drop the dlm reference on each lock *before*
428 * we call the unregister code for releasing parent
429 * directories. */
430 ip->ip_parent = igrab(parent);
431 BUG_ON(!ip->ip_parent);
432 break;
433 case S_IFDIR:
434 inode->i_op = &dlmfs_dir_inode_operations;
435 inode->i_fop = &simple_dir_operations;
436
437 /* directory inodes start off with i_nlink ==
438 * 2 (for "." entry) */
Dave Hansend8c76e62006-09-30 23:29:04 -0700439 inc_nlink(inode);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800440 break;
441 }
442
443 if (parent->i_mode & S_ISGID) {
444 inode->i_gid = parent->i_gid;
445 if (S_ISDIR(mode))
446 inode->i_mode |= S_ISGID;
447 }
448
449 return inode;
450}
451
452/*
453 * File creation. Allocate an inode, and we're done..
454 */
455/* SMP-safe */
456static int dlmfs_mkdir(struct inode * dir,
457 struct dentry * dentry,
458 int mode)
459{
460 int status;
461 struct inode *inode = NULL;
462 struct qstr *domain = &dentry->d_name;
463 struct dlmfs_inode_private *ip;
464 struct dlm_ctxt *dlm;
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800465 struct dlm_protocol_version proto = user_locking_protocol;
Mark Fasheh8df08c82005-12-15 14:31:23 -0800466
467 mlog(0, "mkdir %.*s\n", domain->len, domain->name);
468
469 /* verify that we have a proper domain */
470 if (domain->len >= O2NM_MAX_NAME_LEN) {
471 status = -EINVAL;
472 mlog(ML_ERROR, "invalid domain name for directory.\n");
473 goto bail;
474 }
475
476 inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR);
477 if (!inode) {
478 status = -ENOMEM;
479 mlog_errno(status);
480 goto bail;
481 }
482
483 ip = DLMFS_I(inode);
484
Joel Beckerd24fbcd2008-01-25 17:02:21 -0800485 dlm = user_dlm_register_context(domain, &proto);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800486 if (IS_ERR(dlm)) {
487 status = PTR_ERR(dlm);
488 mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n",
489 status, domain->len, domain->name);
490 goto bail;
491 }
492 ip->ip_dlm = dlm;
493
Dave Hansend8c76e62006-09-30 23:29:04 -0700494 inc_nlink(dir);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800495 d_instantiate(dentry, inode);
496 dget(dentry); /* Extra count - pin the dentry in core */
497
498 status = 0;
499bail:
500 if (status < 0)
501 iput(inode);
502 return status;
503}
504
505static int dlmfs_create(struct inode *dir,
506 struct dentry *dentry,
507 int mode,
508 struct nameidata *nd)
509{
510 int status = 0;
511 struct inode *inode;
512 struct qstr *name = &dentry->d_name;
513
514 mlog(0, "create %.*s\n", name->len, name->name);
515
516 /* verify name is valid and doesn't contain any dlm reserved
517 * characters */
518 if (name->len >= USER_DLM_LOCK_ID_MAX_LEN ||
519 name->name[0] == '$') {
520 status = -EINVAL;
521 mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len,
522 name->name);
523 goto bail;
524 }
525
526 inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG);
527 if (!inode) {
528 status = -ENOMEM;
529 mlog_errno(status);
530 goto bail;
531 }
532
533 d_instantiate(dentry, inode);
534 dget(dentry); /* Extra count - pin the dentry in core */
535bail:
536 return status;
537}
538
539static int dlmfs_unlink(struct inode *dir,
540 struct dentry *dentry)
541{
542 int status;
543 struct inode *inode = dentry->d_inode;
544
545 mlog(0, "unlink inode %lu\n", inode->i_ino);
546
547 /* if there are no current holders, or none that are waiting
548 * to acquire a lock, this basically destroys our lockres. */
549 status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres);
550 if (status < 0) {
551 mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n",
552 dentry->d_name.len, dentry->d_name.name, status);
553 goto bail;
554 }
555 status = simple_unlink(dir, dentry);
556bail:
557 return status;
558}
559
560static int dlmfs_fill_super(struct super_block * sb,
561 void * data,
562 int silent)
563{
564 struct inode * inode;
565 struct dentry * root;
566
567 sb->s_maxbytes = MAX_LFS_FILESIZE;
568 sb->s_blocksize = PAGE_CACHE_SIZE;
569 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
570 sb->s_magic = DLMFS_MAGIC;
571 sb->s_op = &dlmfs_ops;
572 inode = dlmfs_get_root_inode(sb);
573 if (!inode)
574 return -ENOMEM;
575
576 root = d_alloc_root(inode);
577 if (!root) {
578 iput(inode);
579 return -ENOMEM;
580 }
581 sb->s_root = root;
582 return 0;
583}
584
Arjan van de Ven00977a52007-02-12 00:55:34 -0800585static const struct file_operations dlmfs_file_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800586 .open = dlmfs_file_open,
587 .release = dlmfs_file_release,
588 .read = dlmfs_file_read,
589 .write = dlmfs_file_write,
590};
591
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800592static const struct inode_operations dlmfs_dir_inode_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800593 .create = dlmfs_create,
594 .lookup = simple_lookup,
595 .unlink = dlmfs_unlink,
596};
597
598/* this way we can restrict mkdir to only the toplevel of the fs. */
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800599static const struct inode_operations dlmfs_root_inode_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800600 .lookup = simple_lookup,
601 .mkdir = dlmfs_mkdir,
602 .rmdir = simple_rmdir,
603};
604
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800605static const struct super_operations dlmfs_ops = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800606 .statfs = simple_statfs,
607 .alloc_inode = dlmfs_alloc_inode,
608 .destroy_inode = dlmfs_destroy_inode,
609 .clear_inode = dlmfs_clear_inode,
610 .drop_inode = generic_delete_inode,
611};
612
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800613static const struct inode_operations dlmfs_file_inode_operations = {
Mark Fasheh8df08c82005-12-15 14:31:23 -0800614 .getattr = simple_getattr,
615};
616
David Howells454e2392006-06-23 02:02:57 -0700617static int dlmfs_get_sb(struct file_system_type *fs_type,
618 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Mark Fasheh8df08c82005-12-15 14:31:23 -0800619{
David Howells454e2392006-06-23 02:02:57 -0700620 return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800621}
622
623static struct file_system_type dlmfs_fs_type = {
624 .owner = THIS_MODULE,
625 .name = "ocfs2_dlmfs",
626 .get_sb = dlmfs_get_sb,
627 .kill_sb = kill_litter_super,
628};
629
630static int __init init_dlmfs_fs(void)
631{
632 int status;
633 int cleanup_inode = 0, cleanup_worker = 0;
634
635 dlmfs_print_version();
636
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700637 status = bdi_init(&dlmfs_backing_dev_info);
638 if (status)
639 return status;
640
Mark Fasheh8df08c82005-12-15 14:31:23 -0800641 dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
642 sizeof(struct dlmfs_inode_private),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800643 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
644 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900645 dlmfs_init_once);
Coly Li07d9a392008-11-17 12:38:22 +0800646 if (!dlmfs_inode_cache) {
647 status = -ENOMEM;
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700648 goto bail;
Coly Li07d9a392008-11-17 12:38:22 +0800649 }
Mark Fasheh8df08c82005-12-15 14:31:23 -0800650 cleanup_inode = 1;
651
652 user_dlm_worker = create_singlethread_workqueue("user_dlm");
653 if (!user_dlm_worker) {
654 status = -ENOMEM;
655 goto bail;
656 }
657 cleanup_worker = 1;
658
659 status = register_filesystem(&dlmfs_fs_type);
660bail:
661 if (status) {
662 if (cleanup_inode)
663 kmem_cache_destroy(dlmfs_inode_cache);
664 if (cleanup_worker)
665 destroy_workqueue(user_dlm_worker);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700666 bdi_destroy(&dlmfs_backing_dev_info);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800667 } else
668 printk("OCFS2 User DLM kernel interface loaded\n");
669 return status;
670}
671
672static void __exit exit_dlmfs_fs(void)
673{
674 unregister_filesystem(&dlmfs_fs_type);
675
676 flush_workqueue(user_dlm_worker);
677 destroy_workqueue(user_dlm_worker);
678
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700679 kmem_cache_destroy(dlmfs_inode_cache);
Peter Zijlstrae0bf68d2007-10-16 23:25:46 -0700680
681 bdi_destroy(&dlmfs_backing_dev_info);
Mark Fasheh8df08c82005-12-15 14:31:23 -0800682}
683
684MODULE_AUTHOR("Oracle");
685MODULE_LICENSE("GPL");
686
687module_init(init_dlmfs_fs)
688module_exit(exit_dlmfs_fs)