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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 | ||
d24fbcda JB |
63 | #include "ocfs2_lockingver.h" |
64 | ||
ee9b6d61 | 65 | static const struct super_operations dlmfs_ops; |
00977a59 | 66 | static const struct file_operations dlmfs_file_operations; |
92e1d5be AV |
67 | static const struct inode_operations dlmfs_dir_inode_operations; |
68 | static const struct inode_operations dlmfs_root_inode_operations; | |
69 | static const struct inode_operations dlmfs_file_inode_operations; | |
e18b890b | 70 | static struct kmem_cache *dlmfs_inode_cache; |
8df08c89 MF |
71 | |
72 | struct workqueue_struct *user_dlm_worker; | |
73 | ||
d24fbcda JB |
74 | /* |
75 | * This is the userdlmfs locking protocol version. | |
76 | * | |
77 | * See fs/ocfs2/dlmglue.c for more details on locking versions. | |
78 | */ | |
79 | static const struct dlm_protocol_version user_locking_protocol = { | |
80 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
81 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
82 | }; | |
83 | ||
8df08c89 MF |
84 | /* |
85 | * 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 | */ | |
93 | static 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 | ||
109 | static 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 | ||
ad8100e0 | 130 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
8df08c89 MF |
131 | 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; | |
152 | bail: | |
153 | return status; | |
154 | } | |
155 | ||
156 | static 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 | ||
182 | static 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; | |
d28c9174 | 190 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
191 | |
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 | ||
ad8100e0 | 210 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
8df08c89 MF |
211 | 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 | ||
226 | static 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; | |
d28c9174 | 234 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
235 | |
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 | ||
ad8100e0 | 254 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
8df08c89 MF |
255 | 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 | ||
51cc5068 | 270 | static void dlmfs_init_once(void *foo) |
8df08c89 MF |
271 | { |
272 | struct dlmfs_inode_private *ip = | |
273 | (struct dlmfs_inode_private *) foo; | |
274 | ||
a35afb83 CL |
275 | ip->ip_dlm = NULL; |
276 | ip->ip_parent = NULL; | |
8df08c89 | 277 | |
a35afb83 | 278 | inode_init_once(&ip->ip_vfs_inode); |
8df08c89 MF |
279 | } |
280 | ||
281 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
282 | { | |
283 | struct dlmfs_inode_private *ip; | |
284 | ||
e6b4f8da | 285 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
286 | if (!ip) |
287 | return NULL; | |
288 | ||
289 | return &ip->ip_vfs_inode; | |
290 | } | |
291 | ||
292 | static void dlmfs_destroy_inode(struct inode *inode) | |
293 | { | |
294 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); | |
295 | } | |
296 | ||
297 | static 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); | |
322 | clear_fields: | |
323 | ip->ip_parent = NULL; | |
324 | ip->ip_dlm = NULL; | |
325 | } | |
326 | ||
327 | static struct backing_dev_info dlmfs_backing_dev_info = { | |
328 | .ra_pages = 0, /* No readahead */ | |
e4ad08fe | 329 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
8df08c89 MF |
330 | }; |
331 | ||
332 | static 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; | |
342 | inode->i_uid = current->fsuid; | |
343 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
344 | inode->i_blocks = 0; |
345 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
346 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
d8c76e6f | 347 | inc_nlink(inode); |
8df08c89 MF |
348 | |
349 | inode->i_fop = &simple_dir_operations; | |
350 | inode->i_op = &dlmfs_root_inode_operations; | |
351 | } | |
352 | ||
353 | return inode; | |
354 | } | |
355 | ||
356 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
357 | struct dentry *dentry, | |
358 | int mode) | |
359 | { | |
360 | struct super_block *sb = parent->i_sb; | |
361 | struct inode * inode = new_inode(sb); | |
362 | struct dlmfs_inode_private *ip; | |
363 | ||
364 | if (!inode) | |
365 | return NULL; | |
366 | ||
367 | inode->i_mode = mode; | |
368 | inode->i_uid = current->fsuid; | |
369 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
370 | inode->i_blocks = 0; |
371 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
372 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
373 | ||
374 | ip = DLMFS_I(inode); | |
375 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; | |
376 | ||
377 | switch (mode & S_IFMT) { | |
378 | default: | |
379 | /* for now we don't support anything other than | |
380 | * directories and regular files. */ | |
381 | BUG(); | |
382 | break; | |
383 | case S_IFREG: | |
384 | inode->i_op = &dlmfs_file_inode_operations; | |
385 | inode->i_fop = &dlmfs_file_operations; | |
386 | ||
387 | i_size_write(inode, DLM_LVB_LEN); | |
388 | ||
389 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
390 | ||
391 | /* released at clear_inode time, this insures that we | |
392 | * get to drop the dlm reference on each lock *before* | |
393 | * we call the unregister code for releasing parent | |
394 | * directories. */ | |
395 | ip->ip_parent = igrab(parent); | |
396 | BUG_ON(!ip->ip_parent); | |
397 | break; | |
398 | case S_IFDIR: | |
399 | inode->i_op = &dlmfs_dir_inode_operations; | |
400 | inode->i_fop = &simple_dir_operations; | |
401 | ||
402 | /* directory inodes start off with i_nlink == | |
403 | * 2 (for "." entry) */ | |
d8c76e6f | 404 | inc_nlink(inode); |
8df08c89 MF |
405 | break; |
406 | } | |
407 | ||
408 | if (parent->i_mode & S_ISGID) { | |
409 | inode->i_gid = parent->i_gid; | |
410 | if (S_ISDIR(mode)) | |
411 | inode->i_mode |= S_ISGID; | |
412 | } | |
413 | ||
414 | return inode; | |
415 | } | |
416 | ||
417 | /* | |
418 | * File creation. Allocate an inode, and we're done.. | |
419 | */ | |
420 | /* SMP-safe */ | |
421 | static int dlmfs_mkdir(struct inode * dir, | |
422 | struct dentry * dentry, | |
423 | int mode) | |
424 | { | |
425 | int status; | |
426 | struct inode *inode = NULL; | |
427 | struct qstr *domain = &dentry->d_name; | |
428 | struct dlmfs_inode_private *ip; | |
429 | struct dlm_ctxt *dlm; | |
d24fbcda | 430 | struct dlm_protocol_version proto = user_locking_protocol; |
8df08c89 MF |
431 | |
432 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
433 | ||
434 | /* verify that we have a proper domain */ | |
435 | if (domain->len >= O2NM_MAX_NAME_LEN) { | |
436 | status = -EINVAL; | |
437 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
438 | goto bail; | |
439 | } | |
440 | ||
441 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
442 | if (!inode) { | |
443 | status = -ENOMEM; | |
444 | mlog_errno(status); | |
445 | goto bail; | |
446 | } | |
447 | ||
448 | ip = DLMFS_I(inode); | |
449 | ||
d24fbcda | 450 | dlm = user_dlm_register_context(domain, &proto); |
8df08c89 MF |
451 | if (IS_ERR(dlm)) { |
452 | status = PTR_ERR(dlm); | |
453 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", | |
454 | status, domain->len, domain->name); | |
455 | goto bail; | |
456 | } | |
457 | ip->ip_dlm = dlm; | |
458 | ||
d8c76e6f | 459 | inc_nlink(dir); |
8df08c89 MF |
460 | d_instantiate(dentry, inode); |
461 | dget(dentry); /* Extra count - pin the dentry in core */ | |
462 | ||
463 | status = 0; | |
464 | bail: | |
465 | if (status < 0) | |
466 | iput(inode); | |
467 | return status; | |
468 | } | |
469 | ||
470 | static int dlmfs_create(struct inode *dir, | |
471 | struct dentry *dentry, | |
472 | int mode, | |
473 | struct nameidata *nd) | |
474 | { | |
475 | int status = 0; | |
476 | struct inode *inode; | |
477 | struct qstr *name = &dentry->d_name; | |
478 | ||
479 | mlog(0, "create %.*s\n", name->len, name->name); | |
480 | ||
481 | /* verify name is valid and doesn't contain any dlm reserved | |
482 | * characters */ | |
483 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
484 | name->name[0] == '$') { | |
485 | status = -EINVAL; | |
486 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
487 | name->name); | |
488 | goto bail; | |
489 | } | |
490 | ||
491 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
492 | if (!inode) { | |
493 | status = -ENOMEM; | |
494 | mlog_errno(status); | |
495 | goto bail; | |
496 | } | |
497 | ||
498 | d_instantiate(dentry, inode); | |
499 | dget(dentry); /* Extra count - pin the dentry in core */ | |
500 | bail: | |
501 | return status; | |
502 | } | |
503 | ||
504 | static int dlmfs_unlink(struct inode *dir, | |
505 | struct dentry *dentry) | |
506 | { | |
507 | int status; | |
508 | struct inode *inode = dentry->d_inode; | |
509 | ||
510 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
511 | ||
512 | /* if there are no current holders, or none that are waiting | |
513 | * to acquire a lock, this basically destroys our lockres. */ | |
514 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
515 | if (status < 0) { | |
516 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", | |
517 | dentry->d_name.len, dentry->d_name.name, status); | |
518 | goto bail; | |
519 | } | |
520 | status = simple_unlink(dir, dentry); | |
521 | bail: | |
522 | return status; | |
523 | } | |
524 | ||
525 | static int dlmfs_fill_super(struct super_block * sb, | |
526 | void * data, | |
527 | int silent) | |
528 | { | |
529 | struct inode * inode; | |
530 | struct dentry * root; | |
531 | ||
532 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
533 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
534 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
535 | sb->s_magic = DLMFS_MAGIC; | |
536 | sb->s_op = &dlmfs_ops; | |
537 | inode = dlmfs_get_root_inode(sb); | |
538 | if (!inode) | |
539 | return -ENOMEM; | |
540 | ||
541 | root = d_alloc_root(inode); | |
542 | if (!root) { | |
543 | iput(inode); | |
544 | return -ENOMEM; | |
545 | } | |
546 | sb->s_root = root; | |
547 | return 0; | |
548 | } | |
549 | ||
00977a59 | 550 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
551 | .open = dlmfs_file_open, |
552 | .release = dlmfs_file_release, | |
553 | .read = dlmfs_file_read, | |
554 | .write = dlmfs_file_write, | |
555 | }; | |
556 | ||
92e1d5be | 557 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
558 | .create = dlmfs_create, |
559 | .lookup = simple_lookup, | |
560 | .unlink = dlmfs_unlink, | |
561 | }; | |
562 | ||
563 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 564 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
565 | .lookup = simple_lookup, |
566 | .mkdir = dlmfs_mkdir, | |
567 | .rmdir = simple_rmdir, | |
568 | }; | |
569 | ||
ee9b6d61 | 570 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
571 | .statfs = simple_statfs, |
572 | .alloc_inode = dlmfs_alloc_inode, | |
573 | .destroy_inode = dlmfs_destroy_inode, | |
574 | .clear_inode = dlmfs_clear_inode, | |
575 | .drop_inode = generic_delete_inode, | |
576 | }; | |
577 | ||
92e1d5be | 578 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 MF |
579 | .getattr = simple_getattr, |
580 | }; | |
581 | ||
454e2398 DH |
582 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
583 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
8df08c89 | 584 | { |
454e2398 | 585 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
8df08c89 MF |
586 | } |
587 | ||
588 | static struct file_system_type dlmfs_fs_type = { | |
589 | .owner = THIS_MODULE, | |
590 | .name = "ocfs2_dlmfs", | |
591 | .get_sb = dlmfs_get_sb, | |
592 | .kill_sb = kill_litter_super, | |
593 | }; | |
594 | ||
595 | static int __init init_dlmfs_fs(void) | |
596 | { | |
597 | int status; | |
598 | int cleanup_inode = 0, cleanup_worker = 0; | |
599 | ||
600 | dlmfs_print_version(); | |
601 | ||
e0bf68dd PZ |
602 | status = bdi_init(&dlmfs_backing_dev_info); |
603 | if (status) | |
604 | return status; | |
605 | ||
8df08c89 MF |
606 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
607 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 PJ |
608 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
609 | SLAB_MEM_SPREAD), | |
20c2df83 | 610 | dlmfs_init_once); |
8df08c89 | 611 | if (!dlmfs_inode_cache) |
e0bf68dd | 612 | goto bail; |
8df08c89 MF |
613 | 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); | |
623 | bail: | |
624 | if (status) { | |
625 | if (cleanup_inode) | |
626 | kmem_cache_destroy(dlmfs_inode_cache); | |
627 | if (cleanup_worker) | |
628 | destroy_workqueue(user_dlm_worker); | |
e0bf68dd | 629 | bdi_destroy(&dlmfs_backing_dev_info); |
8df08c89 MF |
630 | } else |
631 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
632 | return status; | |
633 | } | |
634 | ||
635 | static 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 | ||
1a1d92c1 | 642 | kmem_cache_destroy(dlmfs_inode_cache); |
e0bf68dd PZ |
643 | |
644 | bdi_destroy(&dlmfs_backing_dev_info); | |
8df08c89 MF |
645 | } |
646 | ||
647 | MODULE_AUTHOR("Oracle"); | |
648 | MODULE_LICENSE("GPL"); | |
649 | ||
650 | module_init(init_dlmfs_fs) | |
651 | module_exit(exit_dlmfs_fs) |