Commit | Line | Data |
---|---|---|
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 MF |
47 | |
48 | #include <asm/uaccess.h> | |
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; | |
211 | struct inode *inode = dentry->d_inode; | |
212 | ||
213 | attr->ia_valid &= ~ATTR_SIZE; | |
214 | error = inode_change_ok(inode, 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 | ||
393 | static struct backing_dev_info dlmfs_backing_dev_info = { | |
d993831f | 394 | .name = "ocfs2-dlmfs", |
8df08c89 | 395 | .ra_pages = 0, /* No readahead */ |
e4ad08fe | 396 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
8df08c89 MF |
397 | }; |
398 | ||
399 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) | |
400 | { | |
401 | struct inode *inode = new_inode(sb); | |
67697cbd | 402 | umode_t mode = S_IFDIR | 0755; |
8df08c89 MF |
403 | |
404 | if (inode) { | |
85fe4025 | 405 | inode->i_ino = get_next_ino(); |
2b15ad06 | 406 | inode_init_owner(inode, NULL, mode); |
8df08c89 MF |
407 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
408 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
d8c76e6f | 409 | inc_nlink(inode); |
8df08c89 MF |
410 | |
411 | inode->i_fop = &simple_dir_operations; | |
412 | inode->i_op = &dlmfs_root_inode_operations; | |
413 | } | |
414 | ||
415 | return inode; | |
416 | } | |
417 | ||
418 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
419 | struct dentry *dentry, | |
67697cbd | 420 | umode_t mode) |
8df08c89 MF |
421 | { |
422 | struct super_block *sb = parent->i_sb; | |
423 | struct inode * inode = new_inode(sb); | |
424 | struct dlmfs_inode_private *ip; | |
425 | ||
426 | if (!inode) | |
427 | return NULL; | |
428 | ||
85fe4025 | 429 | inode->i_ino = get_next_ino(); |
2b15ad06 | 430 | inode_init_owner(inode, parent, mode); |
8df08c89 MF |
431 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
432 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
433 | ||
434 | ip = DLMFS_I(inode); | |
0016eedc | 435 | ip->ip_conn = DLMFS_I(parent)->ip_conn; |
8df08c89 MF |
436 | |
437 | switch (mode & S_IFMT) { | |
438 | default: | |
439 | /* for now we don't support anything other than | |
440 | * directories and regular files. */ | |
441 | BUG(); | |
442 | break; | |
443 | case S_IFREG: | |
444 | inode->i_op = &dlmfs_file_inode_operations; | |
445 | inode->i_fop = &dlmfs_file_operations; | |
446 | ||
447 | i_size_write(inode, DLM_LVB_LEN); | |
448 | ||
449 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
450 | ||
451 | /* released at clear_inode time, this insures that we | |
452 | * get to drop the dlm reference on each lock *before* | |
453 | * we call the unregister code for releasing parent | |
454 | * directories. */ | |
455 | ip->ip_parent = igrab(parent); | |
456 | BUG_ON(!ip->ip_parent); | |
457 | break; | |
458 | case S_IFDIR: | |
459 | inode->i_op = &dlmfs_dir_inode_operations; | |
460 | inode->i_fop = &simple_dir_operations; | |
461 | ||
462 | /* directory inodes start off with i_nlink == | |
463 | * 2 (for "." entry) */ | |
d8c76e6f | 464 | inc_nlink(inode); |
8df08c89 MF |
465 | break; |
466 | } | |
8df08c89 MF |
467 | return inode; |
468 | } | |
469 | ||
470 | /* | |
471 | * File creation. Allocate an inode, and we're done.. | |
472 | */ | |
473 | /* SMP-safe */ | |
474 | static int dlmfs_mkdir(struct inode * dir, | |
475 | struct dentry * dentry, | |
18bb1db3 | 476 | umode_t mode) |
8df08c89 MF |
477 | { |
478 | int status; | |
479 | struct inode *inode = NULL; | |
480 | struct qstr *domain = &dentry->d_name; | |
481 | struct dlmfs_inode_private *ip; | |
0016eedc | 482 | struct ocfs2_cluster_connection *conn; |
8df08c89 MF |
483 | |
484 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
485 | ||
486 | /* verify that we have a proper domain */ | |
0016eedc | 487 | if (domain->len >= GROUP_NAME_MAX) { |
8df08c89 MF |
488 | status = -EINVAL; |
489 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
490 | goto bail; | |
491 | } | |
492 | ||
493 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
494 | if (!inode) { | |
495 | status = -ENOMEM; | |
496 | mlog_errno(status); | |
497 | goto bail; | |
498 | } | |
499 | ||
500 | ip = DLMFS_I(inode); | |
501 | ||
0016eedc JB |
502 | conn = user_dlm_register(domain); |
503 | if (IS_ERR(conn)) { | |
504 | status = PTR_ERR(conn); | |
8df08c89 MF |
505 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", |
506 | status, domain->len, domain->name); | |
507 | goto bail; | |
508 | } | |
0016eedc | 509 | ip->ip_conn = conn; |
8df08c89 | 510 | |
d8c76e6f | 511 | inc_nlink(dir); |
8df08c89 MF |
512 | d_instantiate(dentry, inode); |
513 | dget(dentry); /* Extra count - pin the dentry in core */ | |
514 | ||
515 | status = 0; | |
516 | bail: | |
517 | if (status < 0) | |
518 | iput(inode); | |
519 | return status; | |
520 | } | |
521 | ||
522 | static int dlmfs_create(struct inode *dir, | |
523 | struct dentry *dentry, | |
4acdaf27 | 524 | umode_t mode, |
ebfc3b49 | 525 | bool excl) |
8df08c89 MF |
526 | { |
527 | int status = 0; | |
528 | struct inode *inode; | |
529 | struct qstr *name = &dentry->d_name; | |
530 | ||
531 | mlog(0, "create %.*s\n", name->len, name->name); | |
532 | ||
533 | /* verify name is valid and doesn't contain any dlm reserved | |
534 | * characters */ | |
535 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
536 | name->name[0] == '$') { | |
537 | status = -EINVAL; | |
538 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
539 | name->name); | |
540 | goto bail; | |
541 | } | |
542 | ||
543 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
544 | if (!inode) { | |
545 | status = -ENOMEM; | |
546 | mlog_errno(status); | |
547 | goto bail; | |
548 | } | |
549 | ||
550 | d_instantiate(dentry, inode); | |
551 | dget(dentry); /* Extra count - pin the dentry in core */ | |
552 | bail: | |
553 | return status; | |
554 | } | |
555 | ||
556 | static int dlmfs_unlink(struct inode *dir, | |
557 | struct dentry *dentry) | |
558 | { | |
559 | int status; | |
560 | struct inode *inode = dentry->d_inode; | |
561 | ||
562 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
563 | ||
564 | /* if there are no current holders, or none that are waiting | |
565 | * to acquire a lock, this basically destroys our lockres. */ | |
566 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
567 | if (status < 0) { | |
a455589f AV |
568 | mlog(ML_ERROR, "unlink %pd, error %d from destroy\n", |
569 | dentry, status); | |
8df08c89 MF |
570 | goto bail; |
571 | } | |
572 | status = simple_unlink(dir, dentry); | |
573 | bail: | |
574 | return status; | |
575 | } | |
576 | ||
577 | static int dlmfs_fill_super(struct super_block * sb, | |
578 | void * data, | |
579 | int silent) | |
580 | { | |
8df08c89 MF |
581 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
582 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
583 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
584 | sb->s_magic = DLMFS_MAGIC; | |
585 | sb->s_op = &dlmfs_ops; | |
48fde701 AV |
586 | sb->s_root = d_make_root(dlmfs_get_root_inode(sb)); |
587 | if (!sb->s_root) | |
8df08c89 | 588 | return -ENOMEM; |
8df08c89 MF |
589 | return 0; |
590 | } | |
591 | ||
00977a59 | 592 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
593 | .open = dlmfs_file_open, |
594 | .release = dlmfs_file_release, | |
65b6f340 | 595 | .poll = dlmfs_file_poll, |
8df08c89 MF |
596 | .read = dlmfs_file_read, |
597 | .write = dlmfs_file_write, | |
6038f373 | 598 | .llseek = default_llseek, |
8df08c89 MF |
599 | }; |
600 | ||
92e1d5be | 601 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
602 | .create = dlmfs_create, |
603 | .lookup = simple_lookup, | |
604 | .unlink = dlmfs_unlink, | |
605 | }; | |
606 | ||
607 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 608 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
609 | .lookup = simple_lookup, |
610 | .mkdir = dlmfs_mkdir, | |
611 | .rmdir = simple_rmdir, | |
612 | }; | |
613 | ||
ee9b6d61 | 614 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
615 | .statfs = simple_statfs, |
616 | .alloc_inode = dlmfs_alloc_inode, | |
617 | .destroy_inode = dlmfs_destroy_inode, | |
b57922d9 | 618 | .evict_inode = dlmfs_evict_inode, |
8df08c89 MF |
619 | .drop_inode = generic_delete_inode, |
620 | }; | |
621 | ||
92e1d5be | 622 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 | 623 | .getattr = simple_getattr, |
e8fce482 | 624 | .setattr = dlmfs_file_setattr, |
8df08c89 MF |
625 | }; |
626 | ||
3c26ff6e AV |
627 | static struct dentry *dlmfs_mount(struct file_system_type *fs_type, |
628 | int flags, const char *dev_name, void *data) | |
8df08c89 | 629 | { |
3c26ff6e | 630 | return mount_nodev(fs_type, flags, data, dlmfs_fill_super); |
8df08c89 MF |
631 | } |
632 | ||
633 | static struct file_system_type dlmfs_fs_type = { | |
634 | .owner = THIS_MODULE, | |
635 | .name = "ocfs2_dlmfs", | |
3c26ff6e | 636 | .mount = dlmfs_mount, |
8df08c89 MF |
637 | .kill_sb = kill_litter_super, |
638 | }; | |
7f78e035 | 639 | MODULE_ALIAS_FS("ocfs2_dlmfs"); |
8df08c89 MF |
640 | |
641 | static int __init init_dlmfs_fs(void) | |
642 | { | |
643 | int status; | |
644 | int cleanup_inode = 0, cleanup_worker = 0; | |
645 | ||
e0bf68dd PZ |
646 | status = bdi_init(&dlmfs_backing_dev_info); |
647 | if (status) | |
648 | return status; | |
649 | ||
8df08c89 MF |
650 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
651 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 PJ |
652 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
653 | SLAB_MEM_SPREAD), | |
20c2df83 | 654 | dlmfs_init_once); |
07d9a395 CL |
655 | if (!dlmfs_inode_cache) { |
656 | status = -ENOMEM; | |
e0bf68dd | 657 | goto bail; |
07d9a395 | 658 | } |
8df08c89 MF |
659 | cleanup_inode = 1; |
660 | ||
661 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); | |
662 | if (!user_dlm_worker) { | |
663 | status = -ENOMEM; | |
664 | goto bail; | |
665 | } | |
666 | cleanup_worker = 1; | |
667 | ||
0016eedc | 668 | user_dlm_set_locking_protocol(); |
8df08c89 MF |
669 | status = register_filesystem(&dlmfs_fs_type); |
670 | bail: | |
671 | if (status) { | |
672 | if (cleanup_inode) | |
673 | kmem_cache_destroy(dlmfs_inode_cache); | |
674 | if (cleanup_worker) | |
675 | destroy_workqueue(user_dlm_worker); | |
e0bf68dd | 676 | bdi_destroy(&dlmfs_backing_dev_info); |
8df08c89 MF |
677 | } else |
678 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
679 | return status; | |
680 | } | |
681 | ||
682 | static void __exit exit_dlmfs_fs(void) | |
683 | { | |
684 | unregister_filesystem(&dlmfs_fs_type); | |
685 | ||
686 | flush_workqueue(user_dlm_worker); | |
687 | destroy_workqueue(user_dlm_worker); | |
688 | ||
8c0a8537 KS |
689 | /* |
690 | * Make sure all delayed rcu free inodes are flushed before we | |
691 | * destroy cache. | |
692 | */ | |
693 | rcu_barrier(); | |
1a1d92c1 | 694 | kmem_cache_destroy(dlmfs_inode_cache); |
e0bf68dd PZ |
695 | |
696 | bdi_destroy(&dlmfs_backing_dev_info); | |
8df08c89 MF |
697 | } |
698 | ||
699 | MODULE_AUTHOR("Oracle"); | |
700 | MODULE_LICENSE("GPL"); | |
ff8fb335 | 701 | MODULE_DESCRIPTION("OCFS2 DLM-Filesystem"); |
8df08c89 MF |
702 | |
703 | module_init(init_dlmfs_fs) | |
704 | module_exit(exit_dlmfs_fs) |