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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 | 45 | #include <linux/backing-dev.h> |
65b6f340 | 46 | #include <linux/poll.h> |
8df08c89 | 47 | |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
8df08c89 | 49 | |
0016eedc | 50 | #include "stackglue.h" |
8df08c89 | 51 | #include "userdlm.h" |
8df08c89 MF |
52 | |
53 | #define MLOG_MASK_PREFIX ML_DLMFS | |
54 | #include "cluster/masklog.h" | |
55 | ||
d24fbcda | 56 | |
ee9b6d61 | 57 | static const struct super_operations dlmfs_ops; |
00977a59 | 58 | static const struct file_operations dlmfs_file_operations; |
92e1d5be AV |
59 | static const struct inode_operations dlmfs_dir_inode_operations; |
60 | static const struct inode_operations dlmfs_root_inode_operations; | |
61 | static const struct inode_operations dlmfs_file_inode_operations; | |
e18b890b | 62 | static struct kmem_cache *dlmfs_inode_cache; |
8df08c89 MF |
63 | |
64 | struct workqueue_struct *user_dlm_worker; | |
65 | ||
d24fbcda | 66 | |
14a437c2 JB |
67 | |
68 | /* | |
69 | * These are the ABI capabilities of dlmfs. | |
70 | * | |
71 | * Over time, dlmfs has added some features that were not part of the | |
72 | * initial ABI. Unfortunately, some of these features are not detectable | |
73 | * via standard usage. For example, Linux's default poll always returns | |
74 | * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs | |
75 | * added poll support. Instead, we provide this list of new capabilities. | |
76 | * | |
77 | * Capabilities is a read-only attribute. We do it as a module parameter | |
78 | * so we can discover it whether dlmfs is built in, loaded, or even not | |
79 | * loaded. | |
80 | * | |
81 | * The ABI features are local to this machine's dlmfs mount. This is | |
82 | * distinct from the locking protocol, which is concerned with inter-node | |
83 | * interaction. | |
65b6f340 JB |
84 | * |
85 | * Capabilities: | |
86 | * - bast : POLLIN against the file descriptor of a held lock | |
87 | * signifies a bast fired on the lock. | |
14a437c2 | 88 | */ |
cbe0e331 | 89 | #define DLMFS_CAPABILITIES "bast stackglue" |
98ba073c | 90 | static int param_set_dlmfs_capabilities(const char *val, |
14a437c2 JB |
91 | struct kernel_param *kp) |
92 | { | |
93 | printk(KERN_ERR "%s: readonly parameter\n", kp->name); | |
94 | return -EINVAL; | |
95 | } | |
96 | static int param_get_dlmfs_capabilities(char *buffer, | |
97 | struct kernel_param *kp) | |
98 | { | |
99 | return strlcpy(buffer, DLMFS_CAPABILITIES, | |
100 | strlen(DLMFS_CAPABILITIES) + 1); | |
101 | } | |
102 | module_param_call(capabilities, param_set_dlmfs_capabilities, | |
103 | param_get_dlmfs_capabilities, NULL, 0444); | |
104 | MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES); | |
105 | ||
106 | ||
8df08c89 MF |
107 | /* |
108 | * decodes a set of open flags into a valid lock level and a set of flags. | |
109 | * returns < 0 if we have invalid flags | |
110 | * flags which mean something to us: | |
111 | * O_RDONLY -> PRMODE level | |
112 | * O_WRONLY -> EXMODE level | |
113 | * | |
efd647f7 | 114 | * O_NONBLOCK -> NOQUEUE |
8df08c89 MF |
115 | */ |
116 | static int dlmfs_decode_open_flags(int open_flags, | |
117 | int *level, | |
118 | int *flags) | |
119 | { | |
120 | if (open_flags & (O_WRONLY|O_RDWR)) | |
efd647f7 | 121 | *level = DLM_LOCK_EX; |
8df08c89 | 122 | else |
efd647f7 | 123 | *level = DLM_LOCK_PR; |
8df08c89 MF |
124 | |
125 | *flags = 0; | |
126 | if (open_flags & O_NONBLOCK) | |
efd647f7 | 127 | *flags |= DLM_LKF_NOQUEUE; |
8df08c89 MF |
128 | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static int dlmfs_file_open(struct inode *inode, | |
133 | struct file *file) | |
134 | { | |
135 | int status, level, flags; | |
136 | struct dlmfs_filp_private *fp = NULL; | |
137 | struct dlmfs_inode_private *ip; | |
138 | ||
139 | if (S_ISDIR(inode->i_mode)) | |
140 | BUG(); | |
141 | ||
142 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, | |
143 | file->f_flags); | |
144 | ||
145 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); | |
146 | if (status < 0) | |
147 | goto bail; | |
148 | ||
149 | /* We don't want to honor O_APPEND at read/write time as it | |
150 | * doesn't make sense for LVB writes. */ | |
151 | file->f_flags &= ~O_APPEND; | |
152 | ||
ad8100e0 | 153 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
8df08c89 MF |
154 | if (!fp) { |
155 | status = -ENOMEM; | |
156 | goto bail; | |
157 | } | |
158 | fp->fp_lock_level = level; | |
159 | ||
160 | ip = DLMFS_I(inode); | |
161 | ||
162 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); | |
163 | if (status < 0) { | |
164 | /* this is a strange error to return here but I want | |
165 | * to be able userspace to be able to distinguish a | |
166 | * valid lock request from one that simply couldn't be | |
167 | * granted. */ | |
efd647f7 | 168 | if (flags & DLM_LKF_NOQUEUE && status == -EAGAIN) |
8df08c89 MF |
169 | status = -ETXTBSY; |
170 | kfree(fp); | |
171 | goto bail; | |
172 | } | |
173 | ||
174 | file->private_data = fp; | |
175 | bail: | |
176 | return status; | |
177 | } | |
178 | ||
179 | static int dlmfs_file_release(struct inode *inode, | |
180 | struct file *file) | |
181 | { | |
182 | int level, status; | |
183 | struct dlmfs_inode_private *ip = DLMFS_I(inode); | |
33fa1d90 | 184 | struct dlmfs_filp_private *fp = file->private_data; |
8df08c89 MF |
185 | |
186 | if (S_ISDIR(inode->i_mode)) | |
187 | BUG(); | |
188 | ||
189 | mlog(0, "close called on inode %lu\n", inode->i_ino); | |
190 | ||
191 | status = 0; | |
192 | if (fp) { | |
193 | level = fp->fp_lock_level; | |
efd647f7 | 194 | if (level != DLM_LOCK_IV) |
8df08c89 MF |
195 | user_dlm_cluster_unlock(&ip->ip_lockres, level); |
196 | ||
197 | kfree(fp); | |
198 | file->private_data = NULL; | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
e8fce482 JB |
204 | /* |
205 | * We do ->setattr() just to override size changes. Our size is the size | |
206 | * of the LVB and nothing else. | |
207 | */ | |
208 | static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr) | |
209 | { | |
210 | int error; | |
2b0143b5 | 211 | struct inode *inode = d_inode(dentry); |
e8fce482 JB |
212 | |
213 | attr->ia_valid &= ~ATTR_SIZE; | |
31051c85 | 214 | error = setattr_prepare(dentry, attr); |
1025774c CH |
215 | if (error) |
216 | return error; | |
e8fce482 | 217 | |
1025774c CH |
218 | setattr_copy(inode, attr); |
219 | mark_inode_dirty(inode); | |
220 | return 0; | |
e8fce482 JB |
221 | } |
222 | ||
65b6f340 JB |
223 | static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait) |
224 | { | |
225 | int event = 0; | |
496ad9aa | 226 | struct inode *inode = file_inode(file); |
65b6f340 JB |
227 | struct dlmfs_inode_private *ip = DLMFS_I(inode); |
228 | ||
229 | poll_wait(file, &ip->ip_lockres.l_event, wait); | |
230 | ||
231 | spin_lock(&ip->ip_lockres.l_lock); | |
232 | if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED) | |
233 | event = POLLIN | POLLRDNORM; | |
234 | spin_unlock(&ip->ip_lockres.l_lock); | |
235 | ||
236 | return event; | |
237 | } | |
238 | ||
8df08c89 MF |
239 | static ssize_t dlmfs_file_read(struct file *filp, |
240 | char __user *buf, | |
241 | size_t count, | |
242 | loff_t *ppos) | |
243 | { | |
244 | int bytes_left; | |
0016eedc | 245 | ssize_t readlen, got; |
8df08c89 | 246 | char *lvb_buf; |
496ad9aa | 247 | struct inode *inode = file_inode(filp); |
8df08c89 MF |
248 | |
249 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
250 | inode->i_ino, count, *ppos); | |
251 | ||
252 | if (*ppos >= i_size_read(inode)) | |
253 | return 0; | |
254 | ||
255 | if (!count) | |
256 | return 0; | |
257 | ||
258 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
259 | return -EFAULT; | |
260 | ||
261 | /* don't read past the lvb */ | |
262 | if ((count + *ppos) > i_size_read(inode)) | |
263 | readlen = i_size_read(inode) - *ppos; | |
264 | else | |
a36d515c | 265 | readlen = count; |
8df08c89 | 266 | |
ad8100e0 | 267 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
8df08c89 MF |
268 | if (!lvb_buf) |
269 | return -ENOMEM; | |
270 | ||
0016eedc JB |
271 | got = user_dlm_read_lvb(inode, lvb_buf, readlen); |
272 | if (got) { | |
273 | BUG_ON(got != readlen); | |
274 | bytes_left = __copy_to_user(buf, lvb_buf, readlen); | |
275 | readlen -= bytes_left; | |
276 | } else | |
277 | readlen = 0; | |
8df08c89 MF |
278 | |
279 | kfree(lvb_buf); | |
280 | ||
281 | *ppos = *ppos + readlen; | |
282 | ||
283 | mlog(0, "read %zd bytes\n", readlen); | |
284 | return readlen; | |
285 | } | |
286 | ||
287 | static ssize_t dlmfs_file_write(struct file *filp, | |
288 | const char __user *buf, | |
289 | size_t count, | |
290 | loff_t *ppos) | |
291 | { | |
292 | int bytes_left; | |
293 | ssize_t writelen; | |
294 | char *lvb_buf; | |
496ad9aa | 295 | struct inode *inode = file_inode(filp); |
8df08c89 MF |
296 | |
297 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
298 | inode->i_ino, count, *ppos); | |
299 | ||
300 | if (*ppos >= i_size_read(inode)) | |
301 | return -ENOSPC; | |
302 | ||
303 | if (!count) | |
304 | return 0; | |
305 | ||
306 | if (!access_ok(VERIFY_READ, buf, count)) | |
307 | return -EFAULT; | |
308 | ||
309 | /* don't write past the lvb */ | |
310 | if ((count + *ppos) > i_size_read(inode)) | |
311 | writelen = i_size_read(inode) - *ppos; | |
312 | else | |
313 | writelen = count - *ppos; | |
314 | ||
ad8100e0 | 315 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
8df08c89 MF |
316 | if (!lvb_buf) |
317 | return -ENOMEM; | |
318 | ||
319 | bytes_left = copy_from_user(lvb_buf, buf, writelen); | |
320 | writelen -= bytes_left; | |
321 | if (writelen) | |
322 | user_dlm_write_lvb(inode, lvb_buf, writelen); | |
323 | ||
324 | kfree(lvb_buf); | |
325 | ||
326 | *ppos = *ppos + writelen; | |
327 | mlog(0, "wrote %zd bytes\n", writelen); | |
328 | return writelen; | |
329 | } | |
330 | ||
51cc5068 | 331 | static void dlmfs_init_once(void *foo) |
8df08c89 MF |
332 | { |
333 | struct dlmfs_inode_private *ip = | |
334 | (struct dlmfs_inode_private *) foo; | |
335 | ||
0016eedc | 336 | ip->ip_conn = NULL; |
a35afb83 | 337 | ip->ip_parent = NULL; |
8df08c89 | 338 | |
a35afb83 | 339 | inode_init_once(&ip->ip_vfs_inode); |
8df08c89 MF |
340 | } |
341 | ||
342 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
343 | { | |
344 | struct dlmfs_inode_private *ip; | |
345 | ||
e6b4f8da | 346 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
347 | if (!ip) |
348 | return NULL; | |
349 | ||
350 | return &ip->ip_vfs_inode; | |
351 | } | |
352 | ||
fa0d7e3d | 353 | static void dlmfs_i_callback(struct rcu_head *head) |
8df08c89 | 354 | { |
fa0d7e3d | 355 | struct inode *inode = container_of(head, struct inode, i_rcu); |
8df08c89 MF |
356 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); |
357 | } | |
358 | ||
fa0d7e3d NP |
359 | static void dlmfs_destroy_inode(struct inode *inode) |
360 | { | |
361 | call_rcu(&inode->i_rcu, dlmfs_i_callback); | |
362 | } | |
363 | ||
b57922d9 | 364 | static void dlmfs_evict_inode(struct inode *inode) |
8df08c89 MF |
365 | { |
366 | int status; | |
367 | struct dlmfs_inode_private *ip; | |
368 | ||
dbd5768f | 369 | clear_inode(inode); |
8df08c89 MF |
370 | |
371 | mlog(0, "inode %lu\n", inode->i_ino); | |
372 | ||
373 | ip = DLMFS_I(inode); | |
374 | ||
375 | if (S_ISREG(inode->i_mode)) { | |
376 | status = user_dlm_destroy_lock(&ip->ip_lockres); | |
377 | if (status < 0) | |
378 | mlog_errno(status); | |
379 | iput(ip->ip_parent); | |
380 | goto clear_fields; | |
381 | } | |
382 | ||
0016eedc | 383 | mlog(0, "we're a directory, ip->ip_conn = 0x%p\n", ip->ip_conn); |
8df08c89 MF |
384 | /* we must be a directory. If required, lets unregister the |
385 | * dlm context now. */ | |
0016eedc JB |
386 | if (ip->ip_conn) |
387 | user_dlm_unregister(ip->ip_conn); | |
8df08c89 MF |
388 | clear_fields: |
389 | ip->ip_parent = NULL; | |
0016eedc | 390 | ip->ip_conn = NULL; |
8df08c89 MF |
391 | } |
392 | ||
8df08c89 MF |
393 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) |
394 | { | |
395 | struct inode *inode = new_inode(sb); | |
67697cbd | 396 | umode_t mode = S_IFDIR | 0755; |
8df08c89 MF |
397 | |
398 | if (inode) { | |
85fe4025 | 399 | inode->i_ino = get_next_ino(); |
2b15ad06 | 400 | inode_init_owner(inode, NULL, mode); |
078cd827 | 401 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
d8c76e6f | 402 | inc_nlink(inode); |
8df08c89 MF |
403 | |
404 | inode->i_fop = &simple_dir_operations; | |
405 | inode->i_op = &dlmfs_root_inode_operations; | |
406 | } | |
407 | ||
408 | return inode; | |
409 | } | |
410 | ||
411 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
412 | struct dentry *dentry, | |
67697cbd | 413 | umode_t mode) |
8df08c89 MF |
414 | { |
415 | struct super_block *sb = parent->i_sb; | |
416 | struct inode * inode = new_inode(sb); | |
417 | struct dlmfs_inode_private *ip; | |
418 | ||
419 | if (!inode) | |
420 | return NULL; | |
421 | ||
85fe4025 | 422 | inode->i_ino = get_next_ino(); |
2b15ad06 | 423 | inode_init_owner(inode, parent, mode); |
078cd827 | 424 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
8df08c89 MF |
425 | |
426 | ip = DLMFS_I(inode); | |
0016eedc | 427 | ip->ip_conn = DLMFS_I(parent)->ip_conn; |
8df08c89 MF |
428 | |
429 | switch (mode & S_IFMT) { | |
430 | default: | |
431 | /* for now we don't support anything other than | |
432 | * directories and regular files. */ | |
433 | BUG(); | |
434 | break; | |
435 | case S_IFREG: | |
436 | inode->i_op = &dlmfs_file_inode_operations; | |
437 | inode->i_fop = &dlmfs_file_operations; | |
438 | ||
439 | i_size_write(inode, DLM_LVB_LEN); | |
440 | ||
441 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
442 | ||
443 | /* released at clear_inode time, this insures that we | |
444 | * get to drop the dlm reference on each lock *before* | |
445 | * we call the unregister code for releasing parent | |
446 | * directories. */ | |
447 | ip->ip_parent = igrab(parent); | |
448 | BUG_ON(!ip->ip_parent); | |
449 | break; | |
450 | case S_IFDIR: | |
451 | inode->i_op = &dlmfs_dir_inode_operations; | |
452 | inode->i_fop = &simple_dir_operations; | |
453 | ||
454 | /* directory inodes start off with i_nlink == | |
455 | * 2 (for "." entry) */ | |
d8c76e6f | 456 | inc_nlink(inode); |
8df08c89 MF |
457 | break; |
458 | } | |
8df08c89 MF |
459 | return inode; |
460 | } | |
461 | ||
462 | /* | |
463 | * File creation. Allocate an inode, and we're done.. | |
464 | */ | |
465 | /* SMP-safe */ | |
466 | static int dlmfs_mkdir(struct inode * dir, | |
467 | struct dentry * dentry, | |
18bb1db3 | 468 | umode_t mode) |
8df08c89 MF |
469 | { |
470 | int status; | |
471 | struct inode *inode = NULL; | |
612645f7 | 472 | const struct qstr *domain = &dentry->d_name; |
8df08c89 | 473 | struct dlmfs_inode_private *ip; |
0016eedc | 474 | struct ocfs2_cluster_connection *conn; |
8df08c89 MF |
475 | |
476 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
477 | ||
478 | /* verify that we have a proper domain */ | |
0016eedc | 479 | if (domain->len >= GROUP_NAME_MAX) { |
8df08c89 MF |
480 | status = -EINVAL; |
481 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
482 | goto bail; | |
483 | } | |
484 | ||
485 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
486 | if (!inode) { | |
487 | status = -ENOMEM; | |
488 | mlog_errno(status); | |
489 | goto bail; | |
490 | } | |
491 | ||
492 | ip = DLMFS_I(inode); | |
493 | ||
0016eedc JB |
494 | conn = user_dlm_register(domain); |
495 | if (IS_ERR(conn)) { | |
496 | status = PTR_ERR(conn); | |
8df08c89 MF |
497 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", |
498 | status, domain->len, domain->name); | |
499 | goto bail; | |
500 | } | |
0016eedc | 501 | ip->ip_conn = conn; |
8df08c89 | 502 | |
d8c76e6f | 503 | inc_nlink(dir); |
8df08c89 MF |
504 | d_instantiate(dentry, inode); |
505 | dget(dentry); /* Extra count - pin the dentry in core */ | |
506 | ||
507 | status = 0; | |
508 | bail: | |
509 | if (status < 0) | |
510 | iput(inode); | |
511 | return status; | |
512 | } | |
513 | ||
514 | static int dlmfs_create(struct inode *dir, | |
515 | struct dentry *dentry, | |
4acdaf27 | 516 | umode_t mode, |
ebfc3b49 | 517 | bool excl) |
8df08c89 MF |
518 | { |
519 | int status = 0; | |
520 | struct inode *inode; | |
612645f7 | 521 | const struct qstr *name = &dentry->d_name; |
8df08c89 MF |
522 | |
523 | mlog(0, "create %.*s\n", name->len, name->name); | |
524 | ||
525 | /* verify name is valid and doesn't contain any dlm reserved | |
526 | * characters */ | |
527 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
528 | name->name[0] == '$') { | |
529 | status = -EINVAL; | |
530 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
531 | name->name); | |
532 | goto bail; | |
533 | } | |
534 | ||
535 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
536 | if (!inode) { | |
537 | status = -ENOMEM; | |
538 | mlog_errno(status); | |
539 | goto bail; | |
540 | } | |
541 | ||
542 | d_instantiate(dentry, inode); | |
543 | dget(dentry); /* Extra count - pin the dentry in core */ | |
544 | bail: | |
545 | return status; | |
546 | } | |
547 | ||
548 | static int dlmfs_unlink(struct inode *dir, | |
549 | struct dentry *dentry) | |
550 | { | |
551 | int status; | |
2b0143b5 | 552 | struct inode *inode = d_inode(dentry); |
8df08c89 MF |
553 | |
554 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
555 | ||
556 | /* if there are no current holders, or none that are waiting | |
557 | * to acquire a lock, this basically destroys our lockres. */ | |
558 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
559 | if (status < 0) { | |
a455589f AV |
560 | mlog(ML_ERROR, "unlink %pd, error %d from destroy\n", |
561 | dentry, status); | |
8df08c89 MF |
562 | goto bail; |
563 | } | |
564 | status = simple_unlink(dir, dentry); | |
565 | bail: | |
566 | return status; | |
567 | } | |
568 | ||
569 | static int dlmfs_fill_super(struct super_block * sb, | |
570 | void * data, | |
571 | int silent) | |
572 | { | |
8df08c89 | 573 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
09cbfeaf KS |
574 | sb->s_blocksize = PAGE_SIZE; |
575 | sb->s_blocksize_bits = PAGE_SHIFT; | |
8df08c89 MF |
576 | sb->s_magic = DLMFS_MAGIC; |
577 | sb->s_op = &dlmfs_ops; | |
48fde701 AV |
578 | sb->s_root = d_make_root(dlmfs_get_root_inode(sb)); |
579 | if (!sb->s_root) | |
8df08c89 | 580 | return -ENOMEM; |
8df08c89 MF |
581 | return 0; |
582 | } | |
583 | ||
00977a59 | 584 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
585 | .open = dlmfs_file_open, |
586 | .release = dlmfs_file_release, | |
65b6f340 | 587 | .poll = dlmfs_file_poll, |
8df08c89 MF |
588 | .read = dlmfs_file_read, |
589 | .write = dlmfs_file_write, | |
6038f373 | 590 | .llseek = default_llseek, |
8df08c89 MF |
591 | }; |
592 | ||
92e1d5be | 593 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
594 | .create = dlmfs_create, |
595 | .lookup = simple_lookup, | |
596 | .unlink = dlmfs_unlink, | |
597 | }; | |
598 | ||
599 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 600 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
601 | .lookup = simple_lookup, |
602 | .mkdir = dlmfs_mkdir, | |
603 | .rmdir = simple_rmdir, | |
604 | }; | |
605 | ||
ee9b6d61 | 606 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
607 | .statfs = simple_statfs, |
608 | .alloc_inode = dlmfs_alloc_inode, | |
609 | .destroy_inode = dlmfs_destroy_inode, | |
b57922d9 | 610 | .evict_inode = dlmfs_evict_inode, |
8df08c89 MF |
611 | .drop_inode = generic_delete_inode, |
612 | }; | |
613 | ||
92e1d5be | 614 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 | 615 | .getattr = simple_getattr, |
e8fce482 | 616 | .setattr = dlmfs_file_setattr, |
8df08c89 MF |
617 | }; |
618 | ||
3c26ff6e AV |
619 | static struct dentry *dlmfs_mount(struct file_system_type *fs_type, |
620 | int flags, const char *dev_name, void *data) | |
8df08c89 | 621 | { |
3c26ff6e | 622 | return mount_nodev(fs_type, flags, data, dlmfs_fill_super); |
8df08c89 MF |
623 | } |
624 | ||
625 | static struct file_system_type dlmfs_fs_type = { | |
626 | .owner = THIS_MODULE, | |
627 | .name = "ocfs2_dlmfs", | |
3c26ff6e | 628 | .mount = dlmfs_mount, |
8df08c89 MF |
629 | .kill_sb = kill_litter_super, |
630 | }; | |
7f78e035 | 631 | MODULE_ALIAS_FS("ocfs2_dlmfs"); |
8df08c89 MF |
632 | |
633 | static int __init init_dlmfs_fs(void) | |
634 | { | |
635 | int status; | |
636 | int cleanup_inode = 0, cleanup_worker = 0; | |
637 | ||
8df08c89 MF |
638 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
639 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 | 640 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
5d097056 | 641 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 642 | dlmfs_init_once); |
07d9a395 CL |
643 | if (!dlmfs_inode_cache) { |
644 | status = -ENOMEM; | |
e0bf68dd | 645 | goto bail; |
07d9a395 | 646 | } |
8df08c89 MF |
647 | cleanup_inode = 1; |
648 | ||
0b41be07 | 649 | user_dlm_worker = alloc_workqueue("user_dlm", WQ_MEM_RECLAIM, 0); |
8df08c89 MF |
650 | if (!user_dlm_worker) { |
651 | status = -ENOMEM; | |
652 | goto bail; | |
653 | } | |
654 | cleanup_worker = 1; | |
655 | ||
0016eedc | 656 | user_dlm_set_locking_protocol(); |
8df08c89 MF |
657 | status = register_filesystem(&dlmfs_fs_type); |
658 | bail: | |
659 | if (status) { | |
660 | if (cleanup_inode) | |
661 | kmem_cache_destroy(dlmfs_inode_cache); | |
662 | if (cleanup_worker) | |
663 | destroy_workqueue(user_dlm_worker); | |
664 | } else | |
665 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
666 | return status; | |
667 | } | |
668 | ||
669 | static void __exit exit_dlmfs_fs(void) | |
670 | { | |
671 | unregister_filesystem(&dlmfs_fs_type); | |
672 | ||
8df08c89 MF |
673 | destroy_workqueue(user_dlm_worker); |
674 | ||
8c0a8537 KS |
675 | /* |
676 | * Make sure all delayed rcu free inodes are flushed before we | |
677 | * destroy cache. | |
678 | */ | |
679 | rcu_barrier(); | |
1a1d92c1 | 680 | kmem_cache_destroy(dlmfs_inode_cache); |
e0bf68dd | 681 | |
8df08c89 MF |
682 | } |
683 | ||
684 | MODULE_AUTHOR("Oracle"); | |
685 | MODULE_LICENSE("GPL"); | |
ff8fb335 | 686 | MODULE_DESCRIPTION("OCFS2 DLM-Filesystem"); |
8df08c89 MF |
687 | |
688 | module_init(init_dlmfs_fs) | |
689 | module_exit(exit_dlmfs_fs) |