Commit | Line | Data |
---|---|---|
328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fa60ce2c | 2 | /* |
8df08c89 MF |
3 | * dlmfs.c |
4 | * | |
5 | * Code which implements the kernel side of a minimal userspace | |
6 | * interface to our DLM. This file handles the virtual file system | |
7 | * used for communication with userspace. Credit should go to ramfs, | |
8 | * which was a template for the fs side of this module. | |
9 | * | |
10 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
8df08c89 MF |
11 | */ |
12 | ||
13 | /* Simple VFS hooks based on: */ | |
14 | /* | |
15 | * Resizable simple ram filesystem for Linux. | |
16 | * | |
17 | * Copyright (C) 2000 Linus Torvalds. | |
18 | * 2000 Transmeta Corp. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/highmem.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
8df08c89 | 29 | #include <linux/backing-dev.h> |
65b6f340 | 30 | #include <linux/poll.h> |
8df08c89 | 31 | |
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
8df08c89 | 33 | |
ca322fb6 | 34 | #include "../stackglue.h" |
8df08c89 | 35 | #include "userdlm.h" |
8df08c89 MF |
36 | |
37 | #define MLOG_MASK_PREFIX ML_DLMFS | |
ca322fb6 | 38 | #include "../cluster/masklog.h" |
8df08c89 | 39 | |
d24fbcda | 40 | |
ee9b6d61 | 41 | static const struct super_operations dlmfs_ops; |
00977a59 | 42 | static const struct file_operations dlmfs_file_operations; |
92e1d5be AV |
43 | static const struct inode_operations dlmfs_dir_inode_operations; |
44 | static const struct inode_operations dlmfs_root_inode_operations; | |
45 | static const struct inode_operations dlmfs_file_inode_operations; | |
e18b890b | 46 | static struct kmem_cache *dlmfs_inode_cache; |
8df08c89 MF |
47 | |
48 | struct workqueue_struct *user_dlm_worker; | |
49 | ||
d24fbcda | 50 | |
14a437c2 JB |
51 | |
52 | /* | |
53 | * These are the ABI capabilities of dlmfs. | |
54 | * | |
55 | * Over time, dlmfs has added some features that were not part of the | |
56 | * initial ABI. Unfortunately, some of these features are not detectable | |
57 | * via standard usage. For example, Linux's default poll always returns | |
a9a08845 | 58 | * EPOLLIN, so there is no way for a caller of poll(2) to know when dlmfs |
14a437c2 JB |
59 | * added poll support. Instead, we provide this list of new capabilities. |
60 | * | |
61 | * Capabilities is a read-only attribute. We do it as a module parameter | |
62 | * so we can discover it whether dlmfs is built in, loaded, or even not | |
63 | * loaded. | |
64 | * | |
65 | * The ABI features are local to this machine's dlmfs mount. This is | |
66 | * distinct from the locking protocol, which is concerned with inter-node | |
67 | * interaction. | |
65b6f340 JB |
68 | * |
69 | * Capabilities: | |
a9a08845 | 70 | * - bast : EPOLLIN against the file descriptor of a held lock |
65b6f340 | 71 | * signifies a bast fired on the lock. |
14a437c2 | 72 | */ |
cbe0e331 | 73 | #define DLMFS_CAPABILITIES "bast stackglue" |
98ba073c | 74 | static int param_set_dlmfs_capabilities(const char *val, |
e4dca7b7 | 75 | const struct kernel_param *kp) |
14a437c2 JB |
76 | { |
77 | printk(KERN_ERR "%s: readonly parameter\n", kp->name); | |
78 | return -EINVAL; | |
79 | } | |
80 | static int param_get_dlmfs_capabilities(char *buffer, | |
e4dca7b7 | 81 | const struct kernel_param *kp) |
14a437c2 JB |
82 | { |
83 | return strlcpy(buffer, DLMFS_CAPABILITIES, | |
84 | strlen(DLMFS_CAPABILITIES) + 1); | |
85 | } | |
86 | module_param_call(capabilities, param_set_dlmfs_capabilities, | |
87 | param_get_dlmfs_capabilities, NULL, 0444); | |
88 | MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES); | |
89 | ||
90 | ||
8df08c89 MF |
91 | /* |
92 | * decodes a set of open flags into a valid lock level and a set of flags. | |
93 | * returns < 0 if we have invalid flags | |
94 | * flags which mean something to us: | |
95 | * O_RDONLY -> PRMODE level | |
96 | * O_WRONLY -> EXMODE level | |
97 | * | |
efd647f7 | 98 | * O_NONBLOCK -> NOQUEUE |
8df08c89 MF |
99 | */ |
100 | static int dlmfs_decode_open_flags(int open_flags, | |
101 | int *level, | |
102 | int *flags) | |
103 | { | |
104 | if (open_flags & (O_WRONLY|O_RDWR)) | |
efd647f7 | 105 | *level = DLM_LOCK_EX; |
8df08c89 | 106 | else |
efd647f7 | 107 | *level = DLM_LOCK_PR; |
8df08c89 MF |
108 | |
109 | *flags = 0; | |
110 | if (open_flags & O_NONBLOCK) | |
efd647f7 | 111 | *flags |= DLM_LKF_NOQUEUE; |
8df08c89 MF |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static int dlmfs_file_open(struct inode *inode, | |
117 | struct file *file) | |
118 | { | |
119 | int status, level, flags; | |
120 | struct dlmfs_filp_private *fp = NULL; | |
121 | struct dlmfs_inode_private *ip; | |
122 | ||
123 | if (S_ISDIR(inode->i_mode)) | |
124 | BUG(); | |
125 | ||
126 | mlog(0, "open called on inode %lu, flags 0x%x\n", inode->i_ino, | |
127 | file->f_flags); | |
128 | ||
129 | status = dlmfs_decode_open_flags(file->f_flags, &level, &flags); | |
130 | if (status < 0) | |
131 | goto bail; | |
132 | ||
133 | /* We don't want to honor O_APPEND at read/write time as it | |
134 | * doesn't make sense for LVB writes. */ | |
135 | file->f_flags &= ~O_APPEND; | |
136 | ||
ad8100e0 | 137 | fp = kmalloc(sizeof(*fp), GFP_NOFS); |
8df08c89 MF |
138 | if (!fp) { |
139 | status = -ENOMEM; | |
140 | goto bail; | |
141 | } | |
142 | fp->fp_lock_level = level; | |
143 | ||
144 | ip = DLMFS_I(inode); | |
145 | ||
146 | status = user_dlm_cluster_lock(&ip->ip_lockres, level, flags); | |
147 | if (status < 0) { | |
148 | /* this is a strange error to return here but I want | |
149 | * to be able userspace to be able to distinguish a | |
150 | * valid lock request from one that simply couldn't be | |
151 | * granted. */ | |
efd647f7 | 152 | if (flags & DLM_LKF_NOQUEUE && status == -EAGAIN) |
8df08c89 MF |
153 | status = -ETXTBSY; |
154 | kfree(fp); | |
155 | goto bail; | |
156 | } | |
157 | ||
158 | file->private_data = fp; | |
159 | bail: | |
160 | return status; | |
161 | } | |
162 | ||
163 | static int dlmfs_file_release(struct inode *inode, | |
164 | struct file *file) | |
165 | { | |
cb6a8fd7 | 166 | int level; |
8df08c89 | 167 | struct dlmfs_inode_private *ip = DLMFS_I(inode); |
33fa1d90 | 168 | struct dlmfs_filp_private *fp = file->private_data; |
8df08c89 MF |
169 | |
170 | if (S_ISDIR(inode->i_mode)) | |
171 | BUG(); | |
172 | ||
173 | mlog(0, "close called on inode %lu\n", inode->i_ino); | |
174 | ||
8df08c89 MF |
175 | if (fp) { |
176 | level = fp->fp_lock_level; | |
efd647f7 | 177 | if (level != DLM_LOCK_IV) |
8df08c89 MF |
178 | user_dlm_cluster_unlock(&ip->ip_lockres, level); |
179 | ||
180 | kfree(fp); | |
181 | file->private_data = NULL; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
e8fce482 JB |
187 | /* |
188 | * We do ->setattr() just to override size changes. Our size is the size | |
189 | * of the LVB and nothing else. | |
190 | */ | |
c1632a0f | 191 | static int dlmfs_file_setattr(struct mnt_idmap *idmap, |
549c7297 | 192 | struct dentry *dentry, struct iattr *attr) |
e8fce482 JB |
193 | { |
194 | int error; | |
2b0143b5 | 195 | struct inode *inode = d_inode(dentry); |
e8fce482 JB |
196 | |
197 | attr->ia_valid &= ~ATTR_SIZE; | |
c1632a0f | 198 | error = setattr_prepare(&nop_mnt_idmap, dentry, attr); |
1025774c CH |
199 | if (error) |
200 | return error; | |
e8fce482 | 201 | |
c1632a0f | 202 | setattr_copy(&nop_mnt_idmap, inode, attr); |
1025774c CH |
203 | mark_inode_dirty(inode); |
204 | return 0; | |
e8fce482 JB |
205 | } |
206 | ||
076ccb76 | 207 | static __poll_t dlmfs_file_poll(struct file *file, poll_table *wait) |
65b6f340 | 208 | { |
076ccb76 | 209 | __poll_t event = 0; |
496ad9aa | 210 | struct inode *inode = file_inode(file); |
65b6f340 JB |
211 | struct dlmfs_inode_private *ip = DLMFS_I(inode); |
212 | ||
213 | poll_wait(file, &ip->ip_lockres.l_event, wait); | |
214 | ||
215 | spin_lock(&ip->ip_lockres.l_lock); | |
216 | if (ip->ip_lockres.l_flags & USER_LOCK_BLOCKED) | |
a9a08845 | 217 | event = EPOLLIN | EPOLLRDNORM; |
65b6f340 JB |
218 | spin_unlock(&ip->ip_lockres.l_lock); |
219 | ||
220 | return event; | |
221 | } | |
222 | ||
067c054f | 223 | static ssize_t dlmfs_file_read(struct file *file, |
8df08c89 MF |
224 | char __user *buf, |
225 | size_t count, | |
226 | loff_t *ppos) | |
227 | { | |
067c054f | 228 | char lvb[DLM_LVB_LEN]; |
8df08c89 | 229 | |
067c054f | 230 | if (!user_dlm_read_lvb(file_inode(file), lvb)) |
8df08c89 MF |
231 | return 0; |
232 | ||
067c054f | 233 | return simple_read_from_buffer(buf, count, ppos, lvb, sizeof(lvb)); |
8df08c89 MF |
234 | } |
235 | ||
236 | static ssize_t dlmfs_file_write(struct file *filp, | |
237 | const char __user *buf, | |
238 | size_t count, | |
239 | loff_t *ppos) | |
240 | { | |
067c054f | 241 | char lvb_buf[DLM_LVB_LEN]; |
8df08c89 | 242 | int bytes_left; |
496ad9aa | 243 | struct inode *inode = file_inode(filp); |
8df08c89 MF |
244 | |
245 | mlog(0, "inode %lu, count = %zu, *ppos = %llu\n", | |
246 | inode->i_ino, count, *ppos); | |
247 | ||
067c054f | 248 | if (*ppos >= DLM_LVB_LEN) |
8df08c89 MF |
249 | return -ENOSPC; |
250 | ||
3815f1be | 251 | /* don't write past the lvb */ |
067c054f AV |
252 | if (count > DLM_LVB_LEN - *ppos) |
253 | count = DLM_LVB_LEN - *ppos; | |
3815f1be | 254 | |
8df08c89 MF |
255 | if (!count) |
256 | return 0; | |
257 | ||
3815f1be AV |
258 | bytes_left = copy_from_user(lvb_buf, buf, count); |
259 | count -= bytes_left; | |
260 | if (count) | |
261 | user_dlm_write_lvb(inode, lvb_buf, count); | |
8df08c89 | 262 | |
3815f1be AV |
263 | *ppos = *ppos + count; |
264 | mlog(0, "wrote %zu bytes\n", count); | |
265 | return count; | |
8df08c89 MF |
266 | } |
267 | ||
51cc5068 | 268 | static void dlmfs_init_once(void *foo) |
8df08c89 MF |
269 | { |
270 | struct dlmfs_inode_private *ip = | |
271 | (struct dlmfs_inode_private *) foo; | |
272 | ||
0016eedc | 273 | ip->ip_conn = NULL; |
a35afb83 | 274 | ip->ip_parent = NULL; |
8df08c89 | 275 | |
a35afb83 | 276 | inode_init_once(&ip->ip_vfs_inode); |
8df08c89 MF |
277 | } |
278 | ||
279 | static struct inode *dlmfs_alloc_inode(struct super_block *sb) | |
280 | { | |
281 | struct dlmfs_inode_private *ip; | |
282 | ||
fd60b288 | 283 | ip = alloc_inode_sb(sb, dlmfs_inode_cache, GFP_NOFS); |
8df08c89 MF |
284 | if (!ip) |
285 | return NULL; | |
286 | ||
287 | return &ip->ip_vfs_inode; | |
288 | } | |
289 | ||
9fbc0007 | 290 | static void dlmfs_free_inode(struct inode *inode) |
8df08c89 MF |
291 | { |
292 | kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode)); | |
293 | } | |
294 | ||
b57922d9 | 295 | static void dlmfs_evict_inode(struct inode *inode) |
8df08c89 MF |
296 | { |
297 | int status; | |
298 | struct dlmfs_inode_private *ip; | |
53fd5ffb JB |
299 | struct user_lock_res *lockres; |
300 | int teardown; | |
8df08c89 | 301 | |
dbd5768f | 302 | clear_inode(inode); |
8df08c89 MF |
303 | |
304 | mlog(0, "inode %lu\n", inode->i_ino); | |
305 | ||
306 | ip = DLMFS_I(inode); | |
53fd5ffb | 307 | lockres = &ip->ip_lockres; |
8df08c89 MF |
308 | |
309 | if (S_ISREG(inode->i_mode)) { | |
53fd5ffb JB |
310 | spin_lock(&lockres->l_lock); |
311 | teardown = !!(lockres->l_flags & USER_LOCK_IN_TEARDOWN); | |
312 | spin_unlock(&lockres->l_lock); | |
313 | if (!teardown) { | |
314 | status = user_dlm_destroy_lock(lockres); | |
315 | if (status < 0) | |
316 | mlog_errno(status); | |
317 | } | |
8df08c89 MF |
318 | iput(ip->ip_parent); |
319 | goto clear_fields; | |
320 | } | |
321 | ||
0016eedc | 322 | mlog(0, "we're a directory, ip->ip_conn = 0x%p\n", ip->ip_conn); |
8df08c89 MF |
323 | /* we must be a directory. If required, lets unregister the |
324 | * dlm context now. */ | |
0016eedc JB |
325 | if (ip->ip_conn) |
326 | user_dlm_unregister(ip->ip_conn); | |
8df08c89 MF |
327 | clear_fields: |
328 | ip->ip_parent = NULL; | |
0016eedc | 329 | ip->ip_conn = NULL; |
8df08c89 MF |
330 | } |
331 | ||
8df08c89 MF |
332 | static struct inode *dlmfs_get_root_inode(struct super_block *sb) |
333 | { | |
334 | struct inode *inode = new_inode(sb); | |
67697cbd | 335 | umode_t mode = S_IFDIR | 0755; |
8df08c89 MF |
336 | |
337 | if (inode) { | |
85fe4025 | 338 | inode->i_ino = get_next_ino(); |
21cb47be | 339 | inode_init_owner(&init_user_ns, inode, NULL, mode); |
078cd827 | 340 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
d8c76e6f | 341 | inc_nlink(inode); |
8df08c89 MF |
342 | |
343 | inode->i_fop = &simple_dir_operations; | |
344 | inode->i_op = &dlmfs_root_inode_operations; | |
345 | } | |
346 | ||
347 | return inode; | |
348 | } | |
349 | ||
350 | static struct inode *dlmfs_get_inode(struct inode *parent, | |
351 | struct dentry *dentry, | |
67697cbd | 352 | umode_t mode) |
8df08c89 MF |
353 | { |
354 | struct super_block *sb = parent->i_sb; | |
355 | struct inode * inode = new_inode(sb); | |
356 | struct dlmfs_inode_private *ip; | |
357 | ||
358 | if (!inode) | |
359 | return NULL; | |
360 | ||
85fe4025 | 361 | inode->i_ino = get_next_ino(); |
21cb47be | 362 | inode_init_owner(&init_user_ns, inode, parent, mode); |
078cd827 | 363 | inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
8df08c89 MF |
364 | |
365 | ip = DLMFS_I(inode); | |
0016eedc | 366 | ip->ip_conn = DLMFS_I(parent)->ip_conn; |
8df08c89 MF |
367 | |
368 | switch (mode & S_IFMT) { | |
369 | default: | |
370 | /* for now we don't support anything other than | |
371 | * directories and regular files. */ | |
372 | BUG(); | |
373 | break; | |
374 | case S_IFREG: | |
375 | inode->i_op = &dlmfs_file_inode_operations; | |
376 | inode->i_fop = &dlmfs_file_operations; | |
377 | ||
378 | i_size_write(inode, DLM_LVB_LEN); | |
379 | ||
380 | user_dlm_lock_res_init(&ip->ip_lockres, dentry); | |
381 | ||
382 | /* released at clear_inode time, this insures that we | |
383 | * get to drop the dlm reference on each lock *before* | |
384 | * we call the unregister code for releasing parent | |
385 | * directories. */ | |
386 | ip->ip_parent = igrab(parent); | |
387 | BUG_ON(!ip->ip_parent); | |
388 | break; | |
389 | case S_IFDIR: | |
390 | inode->i_op = &dlmfs_dir_inode_operations; | |
391 | inode->i_fop = &simple_dir_operations; | |
392 | ||
393 | /* directory inodes start off with i_nlink == | |
394 | * 2 (for "." entry) */ | |
d8c76e6f | 395 | inc_nlink(inode); |
8df08c89 MF |
396 | break; |
397 | } | |
8df08c89 MF |
398 | return inode; |
399 | } | |
400 | ||
401 | /* | |
402 | * File creation. Allocate an inode, and we're done.. | |
403 | */ | |
404 | /* SMP-safe */ | |
549c7297 CB |
405 | static int dlmfs_mkdir(struct user_namespace * mnt_userns, |
406 | struct inode * dir, | |
8df08c89 | 407 | struct dentry * dentry, |
18bb1db3 | 408 | umode_t mode) |
8df08c89 MF |
409 | { |
410 | int status; | |
411 | struct inode *inode = NULL; | |
612645f7 | 412 | const struct qstr *domain = &dentry->d_name; |
8df08c89 | 413 | struct dlmfs_inode_private *ip; |
0016eedc | 414 | struct ocfs2_cluster_connection *conn; |
8df08c89 MF |
415 | |
416 | mlog(0, "mkdir %.*s\n", domain->len, domain->name); | |
417 | ||
418 | /* verify that we have a proper domain */ | |
0016eedc | 419 | if (domain->len >= GROUP_NAME_MAX) { |
8df08c89 MF |
420 | status = -EINVAL; |
421 | mlog(ML_ERROR, "invalid domain name for directory.\n"); | |
422 | goto bail; | |
423 | } | |
424 | ||
425 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFDIR); | |
426 | if (!inode) { | |
427 | status = -ENOMEM; | |
428 | mlog_errno(status); | |
429 | goto bail; | |
430 | } | |
431 | ||
432 | ip = DLMFS_I(inode); | |
433 | ||
0016eedc JB |
434 | conn = user_dlm_register(domain); |
435 | if (IS_ERR(conn)) { | |
436 | status = PTR_ERR(conn); | |
8df08c89 MF |
437 | mlog(ML_ERROR, "Error %d could not register domain \"%.*s\"\n", |
438 | status, domain->len, domain->name); | |
439 | goto bail; | |
440 | } | |
0016eedc | 441 | ip->ip_conn = conn; |
8df08c89 | 442 | |
d8c76e6f | 443 | inc_nlink(dir); |
8df08c89 MF |
444 | d_instantiate(dentry, inode); |
445 | dget(dentry); /* Extra count - pin the dentry in core */ | |
446 | ||
447 | status = 0; | |
448 | bail: | |
449 | if (status < 0) | |
450 | iput(inode); | |
451 | return status; | |
452 | } | |
453 | ||
549c7297 CB |
454 | static int dlmfs_create(struct user_namespace *mnt_userns, |
455 | struct inode *dir, | |
8df08c89 | 456 | struct dentry *dentry, |
4acdaf27 | 457 | umode_t mode, |
ebfc3b49 | 458 | bool excl) |
8df08c89 MF |
459 | { |
460 | int status = 0; | |
461 | struct inode *inode; | |
612645f7 | 462 | const struct qstr *name = &dentry->d_name; |
8df08c89 MF |
463 | |
464 | mlog(0, "create %.*s\n", name->len, name->name); | |
465 | ||
466 | /* verify name is valid and doesn't contain any dlm reserved | |
467 | * characters */ | |
468 | if (name->len >= USER_DLM_LOCK_ID_MAX_LEN || | |
469 | name->name[0] == '$') { | |
470 | status = -EINVAL; | |
471 | mlog(ML_ERROR, "invalid lock name, %.*s\n", name->len, | |
472 | name->name); | |
473 | goto bail; | |
474 | } | |
475 | ||
476 | inode = dlmfs_get_inode(dir, dentry, mode | S_IFREG); | |
477 | if (!inode) { | |
478 | status = -ENOMEM; | |
479 | mlog_errno(status); | |
480 | goto bail; | |
481 | } | |
482 | ||
483 | d_instantiate(dentry, inode); | |
484 | dget(dentry); /* Extra count - pin the dentry in core */ | |
485 | bail: | |
486 | return status; | |
487 | } | |
488 | ||
489 | static int dlmfs_unlink(struct inode *dir, | |
490 | struct dentry *dentry) | |
491 | { | |
492 | int status; | |
2b0143b5 | 493 | struct inode *inode = d_inode(dentry); |
8df08c89 MF |
494 | |
495 | mlog(0, "unlink inode %lu\n", inode->i_ino); | |
496 | ||
497 | /* if there are no current holders, or none that are waiting | |
498 | * to acquire a lock, this basically destroys our lockres. */ | |
499 | status = user_dlm_destroy_lock(&DLMFS_I(inode)->ip_lockres); | |
500 | if (status < 0) { | |
a455589f AV |
501 | mlog(ML_ERROR, "unlink %pd, error %d from destroy\n", |
502 | dentry, status); | |
8df08c89 MF |
503 | goto bail; |
504 | } | |
505 | status = simple_unlink(dir, dentry); | |
506 | bail: | |
507 | return status; | |
508 | } | |
509 | ||
510 | static int dlmfs_fill_super(struct super_block * sb, | |
511 | void * data, | |
512 | int silent) | |
513 | { | |
8df08c89 | 514 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
09cbfeaf KS |
515 | sb->s_blocksize = PAGE_SIZE; |
516 | sb->s_blocksize_bits = PAGE_SHIFT; | |
8df08c89 MF |
517 | sb->s_magic = DLMFS_MAGIC; |
518 | sb->s_op = &dlmfs_ops; | |
48fde701 AV |
519 | sb->s_root = d_make_root(dlmfs_get_root_inode(sb)); |
520 | if (!sb->s_root) | |
8df08c89 | 521 | return -ENOMEM; |
8df08c89 MF |
522 | return 0; |
523 | } | |
524 | ||
00977a59 | 525 | static const struct file_operations dlmfs_file_operations = { |
8df08c89 MF |
526 | .open = dlmfs_file_open, |
527 | .release = dlmfs_file_release, | |
65b6f340 | 528 | .poll = dlmfs_file_poll, |
8df08c89 MF |
529 | .read = dlmfs_file_read, |
530 | .write = dlmfs_file_write, | |
6038f373 | 531 | .llseek = default_llseek, |
8df08c89 MF |
532 | }; |
533 | ||
92e1d5be | 534 | static const struct inode_operations dlmfs_dir_inode_operations = { |
8df08c89 MF |
535 | .create = dlmfs_create, |
536 | .lookup = simple_lookup, | |
537 | .unlink = dlmfs_unlink, | |
538 | }; | |
539 | ||
540 | /* this way we can restrict mkdir to only the toplevel of the fs. */ | |
92e1d5be | 541 | static const struct inode_operations dlmfs_root_inode_operations = { |
8df08c89 MF |
542 | .lookup = simple_lookup, |
543 | .mkdir = dlmfs_mkdir, | |
544 | .rmdir = simple_rmdir, | |
545 | }; | |
546 | ||
ee9b6d61 | 547 | static const struct super_operations dlmfs_ops = { |
8df08c89 MF |
548 | .statfs = simple_statfs, |
549 | .alloc_inode = dlmfs_alloc_inode, | |
9fbc0007 | 550 | .free_inode = dlmfs_free_inode, |
b57922d9 | 551 | .evict_inode = dlmfs_evict_inode, |
8df08c89 MF |
552 | .drop_inode = generic_delete_inode, |
553 | }; | |
554 | ||
92e1d5be | 555 | static const struct inode_operations dlmfs_file_inode_operations = { |
8df08c89 | 556 | .getattr = simple_getattr, |
e8fce482 | 557 | .setattr = dlmfs_file_setattr, |
8df08c89 MF |
558 | }; |
559 | ||
3c26ff6e AV |
560 | static struct dentry *dlmfs_mount(struct file_system_type *fs_type, |
561 | int flags, const char *dev_name, void *data) | |
8df08c89 | 562 | { |
3c26ff6e | 563 | return mount_nodev(fs_type, flags, data, dlmfs_fill_super); |
8df08c89 MF |
564 | } |
565 | ||
566 | static struct file_system_type dlmfs_fs_type = { | |
567 | .owner = THIS_MODULE, | |
568 | .name = "ocfs2_dlmfs", | |
3c26ff6e | 569 | .mount = dlmfs_mount, |
8df08c89 MF |
570 | .kill_sb = kill_litter_super, |
571 | }; | |
7f78e035 | 572 | MODULE_ALIAS_FS("ocfs2_dlmfs"); |
8df08c89 MF |
573 | |
574 | static int __init init_dlmfs_fs(void) | |
575 | { | |
576 | int status; | |
577 | int cleanup_inode = 0, cleanup_worker = 0; | |
578 | ||
8df08c89 MF |
579 | dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", |
580 | sizeof(struct dlmfs_inode_private), | |
fffb60f9 | 581 | 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
5d097056 | 582 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 583 | dlmfs_init_once); |
07d9a395 CL |
584 | if (!dlmfs_inode_cache) { |
585 | status = -ENOMEM; | |
e0bf68dd | 586 | goto bail; |
07d9a395 | 587 | } |
8df08c89 MF |
588 | cleanup_inode = 1; |
589 | ||
0b41be07 | 590 | user_dlm_worker = alloc_workqueue("user_dlm", WQ_MEM_RECLAIM, 0); |
8df08c89 MF |
591 | if (!user_dlm_worker) { |
592 | status = -ENOMEM; | |
593 | goto bail; | |
594 | } | |
595 | cleanup_worker = 1; | |
596 | ||
0016eedc | 597 | user_dlm_set_locking_protocol(); |
8df08c89 MF |
598 | status = register_filesystem(&dlmfs_fs_type); |
599 | bail: | |
600 | if (status) { | |
601 | if (cleanup_inode) | |
602 | kmem_cache_destroy(dlmfs_inode_cache); | |
603 | if (cleanup_worker) | |
604 | destroy_workqueue(user_dlm_worker); | |
605 | } else | |
606 | printk("OCFS2 User DLM kernel interface loaded\n"); | |
607 | return status; | |
608 | } | |
609 | ||
610 | static void __exit exit_dlmfs_fs(void) | |
611 | { | |
612 | unregister_filesystem(&dlmfs_fs_type); | |
613 | ||
8df08c89 MF |
614 | destroy_workqueue(user_dlm_worker); |
615 | ||
8c0a8537 KS |
616 | /* |
617 | * Make sure all delayed rcu free inodes are flushed before we | |
618 | * destroy cache. | |
619 | */ | |
620 | rcu_barrier(); | |
1a1d92c1 | 621 | kmem_cache_destroy(dlmfs_inode_cache); |
e0bf68dd | 622 | |
8df08c89 MF |
623 | } |
624 | ||
625 | MODULE_AUTHOR("Oracle"); | |
626 | MODULE_LICENSE("GPL"); | |
ff8fb335 | 627 | MODULE_DESCRIPTION("OCFS2 DLM-Filesystem"); |
8df08c89 MF |
628 | |
629 | module_init(init_dlmfs_fs) | |
630 | module_exit(exit_dlmfs_fs) |