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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 | ||
4ba9b9d0 CL |
270 | static void dlmfs_init_once(struct kmem_cache *cachep, |
271 | void *foo) | |
8df08c89 MF |
272 | { |
273 | struct dlmfs_inode_private *ip = | |
274 | (struct dlmfs_inode_private *) foo; | |
275 | ||
a35afb83 CL |
276 | ip->ip_dlm = NULL; |
277 | ip->ip_parent = NULL; | |
8df08c89 | 278 | |
a35afb83 | 279 | inode_init_once(&ip->ip_vfs_inode); |
8df08c89 MF |
280 | } |
281 | ||
282 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
283 | { | |
284 | struct dlmfs_inode_private *ip; | |
285 | ||
e6b4f8da | 286 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
287 | if (!ip) |
288 | return NULL; | |
289 | ||
290 | return &ip->ip_vfs_inode; | |
291 | } | |
292 | ||
293 | static void dlmfs_destroy_inode(struct inode *inode) | |
294 | { | |
295 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); | |
296 | } | |
297 | ||
298 | static void dlmfs_clear_inode(struct inode *inode) | |
299 | { | |
300 | int status; | |
301 | struct dlmfs_inode_private *ip; | |
302 | ||
303 | if (!inode) | |
304 | return; | |
305 | ||
306 | mlog(0, "inode %lu\n", inode->i_ino); | |
307 | ||
308 | ip = DLMFS_I(inode); | |
309 | ||
310 | if (S_ISREG(inode->i_mode)) { | |
311 | status = user_dlm_destroy_lock(&ip->ip_lockres); | |
312 | if (status < 0) | |
313 | mlog_errno(status); | |
314 | iput(ip->ip_parent); | |
315 | goto clear_fields; | |
316 | } | |
317 | ||
318 | mlog(0, "we're a directory, ip->ip_dlm = 0x%p\n", ip->ip_dlm); | |
319 | /* we must be a directory. If required, lets unregister the | |
320 | * dlm context now. */ | |
321 | if (ip->ip_dlm) | |
322 | user_dlm_unregister_context(ip->ip_dlm); | |
323 | clear_fields: | |
324 | ip->ip_parent = NULL; | |
325 | ip->ip_dlm = NULL; | |
326 | } | |
327 | ||
328 | static struct backing_dev_info dlmfs_backing_dev_info = { | |
329 | .ra_pages = 0, /* No readahead */ | |
330 | .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, | |
331 | }; | |
332 | ||
333 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) | |
334 | { | |
335 | struct inode *inode = new_inode(sb); | |
336 | int mode = S_IFDIR | 0755; | |
337 | struct dlmfs_inode_private *ip; | |
338 | ||
339 | if (inode) { | |
340 | ip = DLMFS_I(inode); | |
341 | ||
342 | inode->i_mode = mode; | |
343 | inode->i_uid = current->fsuid; | |
344 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
345 | inode->i_blocks = 0; |
346 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
347 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
d8c76e6f | 348 | inc_nlink(inode); |
8df08c89 MF |
349 | |
350 | inode->i_fop = &simple_dir_operations; | |
351 | inode->i_op = &dlmfs_root_inode_operations; | |
352 | } | |
353 | ||
354 | return inode; | |
355 | } | |
356 | ||
357 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
358 | struct dentry *dentry, | |
359 | int mode) | |
360 | { | |
361 | struct super_block *sb = parent->i_sb; | |
362 | struct inode * inode = new_inode(sb); | |
363 | struct dlmfs_inode_private *ip; | |
364 | ||
365 | if (!inode) | |
366 | return NULL; | |
367 | ||
368 | inode->i_mode = mode; | |
369 | inode->i_uid = current->fsuid; | |
370 | inode->i_gid = current->fsgid; | |
8df08c89 MF |
371 | inode->i_blocks = 0; |
372 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; | |
373 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
374 | ||
375 | ip = DLMFS_I(inode); | |
376 | ip->ip_dlm = DLMFS_I(parent)->ip_dlm; | |
377 | ||
378 | switch (mode & S_IFMT) { | |
379 | default: | |
380 | /* for now we don't support anything other than | |
381 | * directories and regular files. */ | |
382 | BUG(); | |
383 | break; | |
384 | case S_IFREG: | |
385 | inode->i_op = &dlmfs_file_inode_operations; | |
386 | inode->i_fop = &dlmfs_file_operations; | |
387 | ||
388 | i_size_write(inode, DLM_LVB_LEN); | |
389 | ||
390 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
391 | ||
392 | /* released at clear_inode time, this insures that we | |
393 | * get to drop the dlm reference on each lock *before* | |
394 | * we call the unregister code for releasing parent | |
395 | * directories. */ | |
396 | ip->ip_parent = igrab(parent); | |
397 | BUG_ON(!ip->ip_parent); | |
398 | break; | |
399 | case S_IFDIR: | |
400 | inode->i_op = &dlmfs_dir_inode_operations; | |
401 | inode->i_fop = &simple_dir_operations; | |
402 | ||
403 | /* directory inodes start off with i_nlink == | |
404 | * 2 (for "." entry) */ | |
d8c76e6f | 405 | inc_nlink(inode); |
8df08c89 MF |
406 | break; |
407 | } | |
408 | ||
409 | if (parent->i_mode & S_ISGID) { | |
410 | inode->i_gid = parent->i_gid; | |
411 | if (S_ISDIR(mode)) | |
412 | inode->i_mode |= S_ISGID; | |
413 | } | |
414 | ||
415 | return inode; | |
416 | } | |
417 | ||
418 | /* | |
419 | * File creation. Allocate an inode, and we're done.. | |
420 | */ | |
421 | /* SMP-safe */ | |
422 | static int dlmfs_mkdir(struct inode * dir, | |
423 | struct dentry * dentry, | |
424 | int mode) | |
425 | { | |
426 | int status; | |
427 | struct inode *inode = NULL; | |
428 | struct qstr *domain = &dentry->d_name; | |
429 | struct dlmfs_inode_private *ip; | |
430 | struct dlm_ctxt *dlm; | |
d24fbcda | 431 | struct dlm_protocol_version proto = user_locking_protocol; |
8df08c89 MF |
432 | |
433 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
434 | ||
435 | /* verify that we have a proper domain */ | |
436 | if (domain->len >= O2NM_MAX_NAME_LEN) { | |
437 | status = -EINVAL; | |
438 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
439 | goto bail; | |
440 | } | |
441 | ||
442 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
443 | if (!inode) { | |
444 | status = -ENOMEM; | |
445 | mlog_errno(status); | |
446 | goto bail; | |
447 | } | |
448 | ||
449 | ip = DLMFS_I(inode); | |
450 | ||
d24fbcda | 451 | dlm = user_dlm_register_context(domain, &proto); |
8df08c89 MF |
452 | if (IS_ERR(dlm)) { |
453 | status = PTR_ERR(dlm); | |
454 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", | |
455 | status, domain->len, domain->name); | |
456 | goto bail; | |
457 | } | |
458 | ip->ip_dlm = dlm; | |
459 | ||
d8c76e6f | 460 | inc_nlink(dir); |
8df08c89 MF |
461 | d_instantiate(dentry, inode); |
462 | dget(dentry); /* Extra count - pin the dentry in core */ | |
463 | ||
464 | status = 0; | |
465 | bail: | |
466 | if (status < 0) | |
467 | iput(inode); | |
468 | return status; | |
469 | } | |
470 | ||
471 | static int dlmfs_create(struct inode *dir, | |
472 | struct dentry *dentry, | |
473 | int mode, | |
474 | struct nameidata *nd) | |
475 | { | |
476 | int status = 0; | |
477 | struct inode *inode; | |
478 | struct qstr *name = &dentry->d_name; | |
479 | ||
480 | mlog(0, "create %.*s\n", name->len, name->name); | |
481 | ||
482 | /* verify name is valid and doesn't contain any dlm reserved | |
483 | * characters */ | |
484 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
485 | name->name[0] == '$') { | |
486 | status = -EINVAL; | |
487 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
488 | name->name); | |
489 | goto bail; | |
490 | } | |
491 | ||
492 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
493 | if (!inode) { | |
494 | status = -ENOMEM; | |
495 | mlog_errno(status); | |
496 | goto bail; | |
497 | } | |
498 | ||
499 | d_instantiate(dentry, inode); | |
500 | dget(dentry); /* Extra count - pin the dentry in core */ | |
501 | bail: | |
502 | return status; | |
503 | } | |
504 | ||
505 | static int dlmfs_unlink(struct inode *dir, | |
506 | struct dentry *dentry) | |
507 | { | |
508 | int status; | |
509 | struct inode *inode = dentry->d_inode; | |
510 | ||
511 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
512 | ||
513 | /* if there are no current holders, or none that are waiting | |
514 | * to acquire a lock, this basically destroys our lockres. */ | |
515 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
516 | if (status < 0) { | |
517 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", | |
518 | dentry->d_name.len, dentry->d_name.name, status); | |
519 | goto bail; | |
520 | } | |
521 | status = simple_unlink(dir, dentry); | |
522 | bail: | |
523 | return status; | |
524 | } | |
525 | ||
526 | static int dlmfs_fill_super(struct super_block * sb, | |
527 | void * data, | |
528 | int silent) | |
529 | { | |
530 | struct inode * inode; | |
531 | struct dentry * root; | |
532 | ||
533 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
534 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
535 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
536 | sb->s_magic = DLMFS_MAGIC; | |
537 | sb->s_op = &dlmfs_ops; | |
538 | inode = dlmfs_get_root_inode(sb); | |
539 | if (!inode) | |
540 | return -ENOMEM; | |
541 | ||
542 | root = d_alloc_root(inode); | |
543 | if (!root) { | |
544 | iput(inode); | |
545 | return -ENOMEM; | |
546 | } | |
547 | sb->s_root = root; | |
548 | return 0; | |
549 | } | |
550 | ||
00977a59 | 551 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
552 | .open = dlmfs_file_open, |
553 | .release = dlmfs_file_release, | |
554 | .read = dlmfs_file_read, | |
555 | .write = dlmfs_file_write, | |
556 | }; | |
557 | ||
92e1d5be | 558 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
559 | .create = dlmfs_create, |
560 | .lookup = simple_lookup, | |
561 | .unlink = dlmfs_unlink, | |
562 | }; | |
563 | ||
564 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 565 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
566 | .lookup = simple_lookup, |
567 | .mkdir = dlmfs_mkdir, | |
568 | .rmdir = simple_rmdir, | |
569 | }; | |
570 | ||
ee9b6d61 | 571 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
572 | .statfs = simple_statfs, |
573 | .alloc_inode = dlmfs_alloc_inode, | |
574 | .destroy_inode = dlmfs_destroy_inode, | |
575 | .clear_inode = dlmfs_clear_inode, | |
576 | .drop_inode = generic_delete_inode, | |
577 | }; | |
578 | ||
92e1d5be | 579 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 MF |
580 | .getattr = simple_getattr, |
581 | }; | |
582 | ||
454e2398 DH |
583 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
584 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
8df08c89 | 585 | { |
454e2398 | 586 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
8df08c89 MF |
587 | } |
588 | ||
589 | static struct file_system_type dlmfs_fs_type = { | |
590 | .owner = THIS_MODULE, | |
591 | .name = "ocfs2_dlmfs", | |
592 | .get_sb = dlmfs_get_sb, | |
593 | .kill_sb = kill_litter_super, | |
594 | }; | |
595 | ||
596 | static int __init init_dlmfs_fs(void) | |
597 | { | |
598 | int status; | |
599 | int cleanup_inode = 0, cleanup_worker = 0; | |
600 | ||
601 | dlmfs_print_version(); | |
602 | ||
e0bf68dd PZ |
603 | status = bdi_init(&dlmfs_backing_dev_info); |
604 | if (status) | |
605 | return status; | |
606 | ||
8df08c89 MF |
607 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
608 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 PJ |
609 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
610 | SLAB_MEM_SPREAD), | |
20c2df83 | 611 | dlmfs_init_once); |
8df08c89 | 612 | if (!dlmfs_inode_cache) |
e0bf68dd | 613 | goto bail; |
8df08c89 MF |
614 | cleanup_inode = 1; |
615 | ||
616 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); | |
617 | if (!user_dlm_worker) { | |
618 | status = -ENOMEM; | |
619 | goto bail; | |
620 | } | |
621 | cleanup_worker = 1; | |
622 | ||
623 | status = register_filesystem(&dlmfs_fs_type); | |
624 | bail: | |
625 | if (status) { | |
626 | if (cleanup_inode) | |
627 | kmem_cache_destroy(dlmfs_inode_cache); | |
628 | if (cleanup_worker) | |
629 | destroy_workqueue(user_dlm_worker); | |
e0bf68dd | 630 | bdi_destroy(&dlmfs_backing_dev_info); |
8df08c89 MF |
631 | } else |
632 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
633 | return status; | |
634 | } | |
635 | ||
636 | static void __exit exit_dlmfs_fs(void) | |
637 | { | |
638 | unregister_filesystem(&dlmfs_fs_type); | |
639 | ||
640 | flush_workqueue(user_dlm_worker); | |
641 | destroy_workqueue(user_dlm_worker); | |
642 | ||
1a1d92c1 | 643 | kmem_cache_destroy(dlmfs_inode_cache); |
e0bf68dd PZ |
644 | |
645 | bdi_destroy(&dlmfs_backing_dev_info); | |
8df08c89 MF |
646 | } |
647 | ||
648 | MODULE_AUTHOR("Oracle"); | |
649 | MODULE_LICENSE("GPL"); | |
650 | ||
651 | module_init(init_dlmfs_fs) | |
652 | module_exit(exit_dlmfs_fs) |