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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 MF |
47 | |
48 | #include <asm/uaccess.h> | |
49 | ||
0016eedc | 50 | #include "stackglue.h" |
8df08c89 | 51 | #include "userdlm.h" |
8df08c89 MF |
52 | #include "dlmfsver.h" |
53 | ||
54 | #define MLOG_MASK_PREFIX ML_DLMFS | |
55 | #include "cluster/masklog.h" | |
56 | ||
d24fbcda | 57 | |
ee9b6d61 | 58 | static const struct super_operations dlmfs_ops; |
00977a59 | 59 | static const struct file_operations dlmfs_file_operations; |
92e1d5be AV |
60 | static const struct inode_operations dlmfs_dir_inode_operations; |
61 | static const struct inode_operations dlmfs_root_inode_operations; | |
62 | static const struct inode_operations dlmfs_file_inode_operations; | |
e18b890b | 63 | static struct kmem_cache *dlmfs_inode_cache; |
8df08c89 MF |
64 | |
65 | struct workqueue_struct *user_dlm_worker; | |
66 | ||
d24fbcda | 67 | |
14a437c2 JB |
68 | |
69 | /* | |
70 | * These are the ABI capabilities of dlmfs. | |
71 | * | |
72 | * Over time, dlmfs has added some features that were not part of the | |
73 | * initial ABI. Unfortunately, some of these features are not detectable | |
74 | * via standard usage. For example, Linux's default poll always returns | |
75 | * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs | |
76 | * added poll support. Instead, we provide this list of new capabilities. | |
77 | * | |
78 | * Capabilities is a read-only attribute. We do it as a module parameter | |
79 | * so we can discover it whether dlmfs is built in, loaded, or even not | |
80 | * loaded. | |
81 | * | |
82 | * The ABI features are local to this machine's dlmfs mount. This is | |
83 | * distinct from the locking protocol, which is concerned with inter-node | |
84 | * interaction. | |
65b6f340 JB |
85 | * |
86 | * Capabilities: | |
87 | * - bast : POLLIN against the file descriptor of a held lock | |
88 | * signifies a bast fired on the lock. | |
14a437c2 | 89 | */ |
cbe0e331 | 90 | #define DLMFS_CAPABILITIES "bast stackglue" |
14a437c2 JB |
91 | extern int param_set_dlmfs_capabilities(const char *val, |
92 | struct kernel_param *kp) | |
93 | { | |
94 | printk(KERN_ERR "%s: readonly parameter\n", kp->name); | |
95 | return -EINVAL; | |
96 | } | |
97 | static int param_get_dlmfs_capabilities(char *buffer, | |
98 | struct kernel_param *kp) | |
99 | { | |
100 | return strlcpy(buffer, DLMFS_CAPABILITIES, | |
101 | strlen(DLMFS_CAPABILITIES) + 1); | |
102 | } | |
103 | module_param_call(capabilities, param_set_dlmfs_capabilities, | |
104 | param_get_dlmfs_capabilities, NULL, 0444); | |
105 | MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES); | |
106 | ||
107 | ||
8df08c89 MF |
108 | /* |
109 | * decodes a set of open flags into a valid lock level and a set of flags. | |
110 | * returns < 0 if we have invalid flags | |
111 | * flags which mean something to us: | |
112 | * O_RDONLY -> PRMODE level | |
113 | * O_WRONLY -> EXMODE level | |
114 | * | |
efd647f7 | 115 | * O_NONBLOCK -> NOQUEUE |
8df08c89 MF |
116 | */ |
117 | static int dlmfs_decode_open_flags(int open_flags, | |
118 | int *level, | |
119 | int *flags) | |
120 | { | |
121 | if (open_flags & (O_WRONLY|O_RDWR)) | |
efd647f7 | 122 | *level = DLM_LOCK_EX; |
8df08c89 | 123 | else |
efd647f7 | 124 | *level = DLM_LOCK_PR; |
8df08c89 MF |
125 | |
126 | *flags = 0; | |
127 | if (open_flags & O_NONBLOCK) | |
efd647f7 | 128 | *flags |= DLM_LKF_NOQUEUE; |
8df08c89 MF |
129 | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static int dlmfs_file_open(struct inode *inode, | |
134 | struct file *file) | |
135 | { | |
136 | int status, level, flags; | |
137 | struct dlmfs_filp_private *fp = NULL; | |
138 | struct dlmfs_inode_private *ip; | |
139 | ||
140 | if (S_ISDIR(inode->i_mode)) | |
141 | BUG(); | |
142 | ||
143 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, | |
144 | file->f_flags); | |
145 | ||
146 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); | |
147 | if (status < 0) | |
148 | goto bail; | |
149 | ||
150 | /* We don't want to honor O_APPEND at read/write time as it | |
151 | * doesn't make sense for LVB writes. */ | |
152 | file->f_flags &= ~O_APPEND; | |
153 | ||
ad8100e0 | 154 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
8df08c89 MF |
155 | if (!fp) { |
156 | status = -ENOMEM; | |
157 | goto bail; | |
158 | } | |
159 | fp->fp_lock_level = level; | |
160 | ||
161 | ip = DLMFS_I(inode); | |
162 | ||
163 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); | |
164 | if (status < 0) { | |
165 | /* this is a strange error to return here but I want | |
166 | * to be able userspace to be able to distinguish a | |
167 | * valid lock request from one that simply couldn't be | |
168 | * granted. */ | |
efd647f7 | 169 | if (flags & DLM_LKF_NOQUEUE && status == -EAGAIN) |
8df08c89 MF |
170 | status = -ETXTBSY; |
171 | kfree(fp); | |
172 | goto bail; | |
173 | } | |
174 | ||
175 | file->private_data = fp; | |
176 | bail: | |
177 | return status; | |
178 | } | |
179 | ||
180 | static int dlmfs_file_release(struct inode *inode, | |
181 | struct file *file) | |
182 | { | |
183 | int level, status; | |
184 | struct dlmfs_inode_private *ip = DLMFS_I(inode); | |
185 | struct dlmfs_filp_private *fp = | |
186 | (struct dlmfs_filp_private *) file->private_data; | |
187 | ||
188 | if (S_ISDIR(inode->i_mode)) | |
189 | BUG(); | |
190 | ||
191 | mlog(0, "close called on inode %lu\n", inode->i_ino); | |
192 | ||
193 | status = 0; | |
194 | if (fp) { | |
195 | level = fp->fp_lock_level; | |
efd647f7 | 196 | if (level != DLM_LOCK_IV) |
8df08c89 MF |
197 | user_dlm_cluster_unlock(&ip->ip_lockres, level); |
198 | ||
199 | kfree(fp); | |
200 | file->private_data = NULL; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
e8fce482 JB |
206 | /* |
207 | * We do ->setattr() just to override size changes. Our size is the size | |
208 | * of the LVB and nothing else. | |
209 | */ | |
210 | static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr) | |
211 | { | |
212 | int error; | |
213 | struct inode *inode = dentry->d_inode; | |
214 | ||
215 | attr->ia_valid &= ~ATTR_SIZE; | |
216 | error = inode_change_ok(inode, attr); | |
1025774c CH |
217 | if (error) |
218 | return error; | |
e8fce482 | 219 | |
1025774c CH |
220 | setattr_copy(inode, attr); |
221 | mark_inode_dirty(inode); | |
222 | return 0; | |
e8fce482 JB |
223 | } |
224 | ||
65b6f340 JB |
225 | static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait) |
226 | { | |
227 | int event = 0; | |
228 | struct inode *inode = file->f_path.dentry->d_inode; | |
229 | struct dlmfs_inode_private *ip = DLMFS_I(inode); | |
230 | ||
231 | poll_wait(file, &ip->ip_lockres.l_event, wait); | |
232 | ||
233 | spin_lock(&ip->ip_lockres.l_lock); | |
234 | if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED) | |
235 | event = POLLIN | POLLRDNORM; | |
236 | spin_unlock(&ip->ip_lockres.l_lock); | |
237 | ||
238 | return event; | |
239 | } | |
240 | ||
8df08c89 MF |
241 | static ssize_t dlmfs_file_read(struct file *filp, |
242 | char __user *buf, | |
243 | size_t count, | |
244 | loff_t *ppos) | |
245 | { | |
246 | int bytes_left; | |
0016eedc | 247 | ssize_t readlen, got; |
8df08c89 | 248 | char *lvb_buf; |
d28c9174 | 249 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
250 | |
251 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
252 | inode->i_ino, count, *ppos); | |
253 | ||
254 | if (*ppos >= i_size_read(inode)) | |
255 | return 0; | |
256 | ||
257 | if (!count) | |
258 | return 0; | |
259 | ||
260 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
261 | return -EFAULT; | |
262 | ||
263 | /* don't read past the lvb */ | |
264 | if ((count + *ppos) > i_size_read(inode)) | |
265 | readlen = i_size_read(inode) - *ppos; | |
266 | else | |
a36d515c | 267 | readlen = count; |
8df08c89 | 268 | |
ad8100e0 | 269 | lvb_buf = kmalloc(readlen, GFP_NOFS); |
8df08c89 MF |
270 | if (!lvb_buf) |
271 | return -ENOMEM; | |
272 | ||
0016eedc JB |
273 | got = user_dlm_read_lvb(inode, lvb_buf, readlen); |
274 | if (got) { | |
275 | BUG_ON(got != readlen); | |
276 | bytes_left = __copy_to_user(buf, lvb_buf, readlen); | |
277 | readlen -= bytes_left; | |
278 | } else | |
279 | readlen = 0; | |
8df08c89 MF |
280 | |
281 | kfree(lvb_buf); | |
282 | ||
283 | *ppos = *ppos + readlen; | |
284 | ||
285 | mlog(0, "read %zd bytes\n", readlen); | |
286 | return readlen; | |
287 | } | |
288 | ||
289 | static ssize_t dlmfs_file_write(struct file *filp, | |
290 | const char __user *buf, | |
291 | size_t count, | |
292 | loff_t *ppos) | |
293 | { | |
294 | int bytes_left; | |
295 | ssize_t writelen; | |
296 | char *lvb_buf; | |
d28c9174 | 297 | struct inode *inode = filp->f_path.dentry->d_inode; |
8df08c89 MF |
298 | |
299 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
300 | inode->i_ino, count, *ppos); | |
301 | ||
302 | if (*ppos >= i_size_read(inode)) | |
303 | return -ENOSPC; | |
304 | ||
305 | if (!count) | |
306 | return 0; | |
307 | ||
308 | if (!access_ok(VERIFY_READ, buf, count)) | |
309 | return -EFAULT; | |
310 | ||
311 | /* don't write past the lvb */ | |
312 | if ((count + *ppos) > i_size_read(inode)) | |
313 | writelen = i_size_read(inode) - *ppos; | |
314 | else | |
315 | writelen = count - *ppos; | |
316 | ||
ad8100e0 | 317 | lvb_buf = kmalloc(writelen, GFP_NOFS); |
8df08c89 MF |
318 | if (!lvb_buf) |
319 | return -ENOMEM; | |
320 | ||
321 | bytes_left = copy_from_user(lvb_buf, buf, writelen); | |
322 | writelen -= bytes_left; | |
323 | if (writelen) | |
324 | user_dlm_write_lvb(inode, lvb_buf, writelen); | |
325 | ||
326 | kfree(lvb_buf); | |
327 | ||
328 | *ppos = *ppos + writelen; | |
329 | mlog(0, "wrote %zd bytes\n", writelen); | |
330 | return writelen; | |
331 | } | |
332 | ||
51cc5068 | 333 | static void dlmfs_init_once(void *foo) |
8df08c89 MF |
334 | { |
335 | struct dlmfs_inode_private *ip = | |
336 | (struct dlmfs_inode_private *) foo; | |
337 | ||
0016eedc | 338 | ip->ip_conn = NULL; |
a35afb83 | 339 | ip->ip_parent = NULL; |
8df08c89 | 340 | |
a35afb83 | 341 | inode_init_once(&ip->ip_vfs_inode); |
8df08c89 MF |
342 | } |
343 | ||
344 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
345 | { | |
346 | struct dlmfs_inode_private *ip; | |
347 | ||
e6b4f8da | 348 | ip = kmem_cache_alloc(dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
349 | if (!ip) |
350 | return NULL; | |
351 | ||
352 | return &ip->ip_vfs_inode; | |
353 | } | |
354 | ||
355 | static void dlmfs_destroy_inode(struct inode *inode) | |
356 | { | |
357 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); | |
358 | } | |
359 | ||
b57922d9 | 360 | static void dlmfs_evict_inode(struct inode *inode) |
8df08c89 MF |
361 | { |
362 | int status; | |
363 | struct dlmfs_inode_private *ip; | |
364 | ||
b57922d9 | 365 | end_writeback(inode); |
8df08c89 MF |
366 | |
367 | mlog(0, "inode %lu\n", inode->i_ino); | |
368 | ||
369 | ip = DLMFS_I(inode); | |
370 | ||
371 | if (S_ISREG(inode->i_mode)) { | |
372 | status = user_dlm_destroy_lock(&ip->ip_lockres); | |
373 | if (status < 0) | |
374 | mlog_errno(status); | |
375 | iput(ip->ip_parent); | |
376 | goto clear_fields; | |
377 | } | |
378 | ||
0016eedc | 379 | mlog(0, "we're a directory, ip->ip_conn = 0x%p\n", ip->ip_conn); |
8df08c89 MF |
380 | /* we must be a directory. If required, lets unregister the |
381 | * dlm context now. */ | |
0016eedc JB |
382 | if (ip->ip_conn) |
383 | user_dlm_unregister(ip->ip_conn); | |
8df08c89 MF |
384 | clear_fields: |
385 | ip->ip_parent = NULL; | |
0016eedc | 386 | ip->ip_conn = NULL; |
8df08c89 MF |
387 | } |
388 | ||
389 | static struct backing_dev_info dlmfs_backing_dev_info = { | |
d993831f | 390 | .name = "ocfs2-dlmfs", |
8df08c89 | 391 | .ra_pages = 0, /* No readahead */ |
e4ad08fe | 392 | .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, |
8df08c89 MF |
393 | }; |
394 | ||
395 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) | |
396 | { | |
397 | struct inode *inode = new_inode(sb); | |
398 | int mode = S_IFDIR | 0755; | |
399 | struct dlmfs_inode_private *ip; | |
400 | ||
401 | if (inode) { | |
402 | ip = DLMFS_I(inode); | |
403 | ||
404 | inode->i_mode = mode; | |
b19c2a3b DH |
405 | inode->i_uid = current_fsuid(); |
406 | inode->i_gid = current_fsgid(); | |
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, | |
420 | int mode) | |
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 | ||
429 | inode->i_mode = mode; | |
b19c2a3b DH |
430 | inode->i_uid = current_fsuid(); |
431 | inode->i_gid = current_fsgid(); | |
8df08c89 MF |
432 | inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; |
433 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
434 | ||
435 | ip = DLMFS_I(inode); | |
0016eedc | 436 | ip->ip_conn = DLMFS_I(parent)->ip_conn; |
8df08c89 MF |
437 | |
438 | switch (mode & S_IFMT) { | |
439 | default: | |
440 | /* for now we don't support anything other than | |
441 | * directories and regular files. */ | |
442 | BUG(); | |
443 | break; | |
444 | case S_IFREG: | |
445 | inode->i_op = &dlmfs_file_inode_operations; | |
446 | inode->i_fop = &dlmfs_file_operations; | |
447 | ||
448 | i_size_write(inode, DLM_LVB_LEN); | |
449 | ||
450 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
451 | ||
452 | /* released at clear_inode time, this insures that we | |
453 | * get to drop the dlm reference on each lock *before* | |
454 | * we call the unregister code for releasing parent | |
455 | * directories. */ | |
456 | ip->ip_parent = igrab(parent); | |
457 | BUG_ON(!ip->ip_parent); | |
458 | break; | |
459 | case S_IFDIR: | |
460 | inode->i_op = &dlmfs_dir_inode_operations; | |
461 | inode->i_fop = &simple_dir_operations; | |
462 | ||
463 | /* directory inodes start off with i_nlink == | |
464 | * 2 (for "." entry) */ | |
d8c76e6f | 465 | inc_nlink(inode); |
8df08c89 MF |
466 | break; |
467 | } | |
468 | ||
469 | if (parent->i_mode & S_ISGID) { | |
470 | inode->i_gid = parent->i_gid; | |
471 | if (S_ISDIR(mode)) | |
472 | inode->i_mode |= S_ISGID; | |
473 | } | |
474 | ||
475 | return inode; | |
476 | } | |
477 | ||
478 | /* | |
479 | * File creation. Allocate an inode, and we're done.. | |
480 | */ | |
481 | /* SMP-safe */ | |
482 | static int dlmfs_mkdir(struct inode * dir, | |
483 | struct dentry * dentry, | |
484 | int mode) | |
485 | { | |
486 | int status; | |
487 | struct inode *inode = NULL; | |
488 | struct qstr *domain = &dentry->d_name; | |
489 | struct dlmfs_inode_private *ip; | |
0016eedc | 490 | struct ocfs2_cluster_connection *conn; |
8df08c89 MF |
491 | |
492 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
493 | ||
494 | /* verify that we have a proper domain */ | |
0016eedc | 495 | if (domain->len >= GROUP_NAME_MAX) { |
8df08c89 MF |
496 | status = -EINVAL; |
497 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
498 | goto bail; | |
499 | } | |
500 | ||
501 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
502 | if (!inode) { | |
503 | status = -ENOMEM; | |
504 | mlog_errno(status); | |
505 | goto bail; | |
506 | } | |
507 | ||
508 | ip = DLMFS_I(inode); | |
509 | ||
0016eedc JB |
510 | conn = user_dlm_register(domain); |
511 | if (IS_ERR(conn)) { | |
512 | status = PTR_ERR(conn); | |
8df08c89 MF |
513 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", |
514 | status, domain->len, domain->name); | |
515 | goto bail; | |
516 | } | |
0016eedc | 517 | ip->ip_conn = conn; |
8df08c89 | 518 | |
d8c76e6f | 519 | inc_nlink(dir); |
8df08c89 MF |
520 | d_instantiate(dentry, inode); |
521 | dget(dentry); /* Extra count - pin the dentry in core */ | |
522 | ||
523 | status = 0; | |
524 | bail: | |
525 | if (status < 0) | |
526 | iput(inode); | |
527 | return status; | |
528 | } | |
529 | ||
530 | static int dlmfs_create(struct inode *dir, | |
531 | struct dentry *dentry, | |
532 | int mode, | |
533 | struct nameidata *nd) | |
534 | { | |
535 | int status = 0; | |
536 | struct inode *inode; | |
537 | struct qstr *name = &dentry->d_name; | |
538 | ||
539 | mlog(0, "create %.*s\n", name->len, name->name); | |
540 | ||
541 | /* verify name is valid and doesn't contain any dlm reserved | |
542 | * characters */ | |
543 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
544 | name->name[0] == '$') { | |
545 | status = -EINVAL; | |
546 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
547 | name->name); | |
548 | goto bail; | |
549 | } | |
550 | ||
551 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
552 | if (!inode) { | |
553 | status = -ENOMEM; | |
554 | mlog_errno(status); | |
555 | goto bail; | |
556 | } | |
557 | ||
558 | d_instantiate(dentry, inode); | |
559 | dget(dentry); /* Extra count - pin the dentry in core */ | |
560 | bail: | |
561 | return status; | |
562 | } | |
563 | ||
564 | static int dlmfs_unlink(struct inode *dir, | |
565 | struct dentry *dentry) | |
566 | { | |
567 | int status; | |
568 | struct inode *inode = dentry->d_inode; | |
569 | ||
570 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
571 | ||
572 | /* if there are no current holders, or none that are waiting | |
573 | * to acquire a lock, this basically destroys our lockres. */ | |
574 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
575 | if (status < 0) { | |
576 | mlog(ML_ERROR, "unlink %.*s, error %d from destroy\n", | |
577 | dentry->d_name.len, dentry->d_name.name, status); | |
578 | goto bail; | |
579 | } | |
580 | status = simple_unlink(dir, dentry); | |
581 | bail: | |
582 | return status; | |
583 | } | |
584 | ||
585 | static int dlmfs_fill_super(struct super_block * sb, | |
586 | void * data, | |
587 | int silent) | |
588 | { | |
589 | struct inode * inode; | |
590 | struct dentry * root; | |
591 | ||
592 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
593 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
594 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
595 | sb->s_magic = DLMFS_MAGIC; | |
596 | sb->s_op = &dlmfs_ops; | |
597 | inode = dlmfs_get_root_inode(sb); | |
598 | if (!inode) | |
599 | return -ENOMEM; | |
600 | ||
601 | root = d_alloc_root(inode); | |
602 | if (!root) { | |
603 | iput(inode); | |
604 | return -ENOMEM; | |
605 | } | |
606 | sb->s_root = root; | |
607 | return 0; | |
608 | } | |
609 | ||
00977a59 | 610 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
611 | .open = dlmfs_file_open, |
612 | .release = dlmfs_file_release, | |
65b6f340 | 613 | .poll = dlmfs_file_poll, |
8df08c89 MF |
614 | .read = dlmfs_file_read, |
615 | .write = dlmfs_file_write, | |
616 | }; | |
617 | ||
92e1d5be | 618 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
619 | .create = dlmfs_create, |
620 | .lookup = simple_lookup, | |
621 | .unlink = dlmfs_unlink, | |
622 | }; | |
623 | ||
624 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 625 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
626 | .lookup = simple_lookup, |
627 | .mkdir = dlmfs_mkdir, | |
628 | .rmdir = simple_rmdir, | |
629 | }; | |
630 | ||
ee9b6d61 | 631 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
632 | .statfs = simple_statfs, |
633 | .alloc_inode = dlmfs_alloc_inode, | |
634 | .destroy_inode = dlmfs_destroy_inode, | |
b57922d9 | 635 | .evict_inode = dlmfs_evict_inode, |
8df08c89 MF |
636 | .drop_inode = generic_delete_inode, |
637 | }; | |
638 | ||
92e1d5be | 639 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 | 640 | .getattr = simple_getattr, |
e8fce482 | 641 | .setattr = dlmfs_file_setattr, |
8df08c89 MF |
642 | }; |
643 | ||
454e2398 DH |
644 | static int dlmfs_get_sb(struct file_system_type *fs_type, |
645 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
8df08c89 | 646 | { |
454e2398 | 647 | return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt); |
8df08c89 MF |
648 | } |
649 | ||
650 | static struct file_system_type dlmfs_fs_type = { | |
651 | .owner = THIS_MODULE, | |
652 | .name = "ocfs2_dlmfs", | |
653 | .get_sb = dlmfs_get_sb, | |
654 | .kill_sb = kill_litter_super, | |
655 | }; | |
656 | ||
657 | static int __init init_dlmfs_fs(void) | |
658 | { | |
659 | int status; | |
660 | int cleanup_inode = 0, cleanup_worker = 0; | |
661 | ||
662 | dlmfs_print_version(); | |
663 | ||
e0bf68dd PZ |
664 | status = bdi_init(&dlmfs_backing_dev_info); |
665 | if (status) | |
666 | return status; | |
667 | ||
8df08c89 MF |
668 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
669 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 PJ |
670 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
671 | SLAB_MEM_SPREAD), | |
20c2df83 | 672 | dlmfs_init_once); |
07d9a395 CL |
673 | if (!dlmfs_inode_cache) { |
674 | status = -ENOMEM; | |
e0bf68dd | 675 | goto bail; |
07d9a395 | 676 | } |
8df08c89 MF |
677 | cleanup_inode = 1; |
678 | ||
679 | user_dlm_worker = create_singlethread_workqueue("user_dlm"); | |
680 | if (!user_dlm_worker) { | |
681 | status = -ENOMEM; | |
682 | goto bail; | |
683 | } | |
684 | cleanup_worker = 1; | |
685 | ||
0016eedc | 686 | user_dlm_set_locking_protocol(); |
8df08c89 MF |
687 | status = register_filesystem(&dlmfs_fs_type); |
688 | bail: | |
689 | if (status) { | |
690 | if (cleanup_inode) | |
691 | kmem_cache_destroy(dlmfs_inode_cache); | |
692 | if (cleanup_worker) | |
693 | destroy_workqueue(user_dlm_worker); | |
e0bf68dd | 694 | bdi_destroy(&dlmfs_backing_dev_info); |
8df08c89 MF |
695 | } else |
696 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
697 | return status; | |
698 | } | |
699 | ||
700 | static void __exit exit_dlmfs_fs(void) | |
701 | { | |
702 | unregister_filesystem(&dlmfs_fs_type); | |
703 | ||
704 | flush_workqueue(user_dlm_worker); | |
705 | destroy_workqueue(user_dlm_worker); | |
706 | ||
1a1d92c1 | 707 | kmem_cache_destroy(dlmfs_inode_cache); |
e0bf68dd PZ |
708 | |
709 | bdi_destroy(&dlmfs_backing_dev_info); | |
8df08c89 MF |
710 | } |
711 | ||
712 | MODULE_AUTHOR("Oracle"); | |
713 | MODULE_LICENSE("GPL"); | |
714 | ||
715 | module_init(init_dlmfs_fs) | |
716 | module_exit(exit_dlmfs_fs) |