Commit | Line | Data |
---|---|---|
e82894f8 TZ |
1 | /* |
2 | * VFS-related code for RelayFS, a high-speed data relay filesystem. | |
3 | * | |
4 | * Copyright (C) 2003-2005 - Tom Zanussi <zanussi@us.ibm.com>, IBM Corp | |
5 | * Copyright (C) 2003-2005 - Karim Yaghmour <karim@opersys.com> | |
6 | * | |
7 | * Based on ramfs, Copyright (C) 2002 - Linus Torvalds | |
8 | * | |
9 | * This file is released under the GPL. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/mount.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/backing-dev.h> | |
19 | #include <linux/namei.h> | |
20 | #include <linux/poll.h> | |
21 | #include <linux/relayfs_fs.h> | |
22 | #include "relay.h" | |
23 | #include "buffers.h" | |
24 | ||
25 | #define RELAYFS_MAGIC 0xF0B4A981 | |
26 | ||
27 | static struct vfsmount * relayfs_mount; | |
28 | static int relayfs_mount_count; | |
e82894f8 TZ |
29 | |
30 | static struct backing_dev_info relayfs_backing_dev_info = { | |
31 | .ra_pages = 0, /* No readahead */ | |
32 | .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, | |
33 | }; | |
34 | ||
907f2c77 TZ |
35 | static struct inode *relayfs_get_inode(struct super_block *sb, |
36 | int mode, | |
37 | struct file_operations *fops, | |
6625b861 | 38 | void *data) |
e82894f8 | 39 | { |
e82894f8 TZ |
40 | struct inode *inode; |
41 | ||
e82894f8 | 42 | inode = new_inode(sb); |
6625b861 | 43 | if (!inode) |
e82894f8 | 44 | return NULL; |
e82894f8 TZ |
45 | |
46 | inode->i_mode = mode; | |
47 | inode->i_uid = 0; | |
48 | inode->i_gid = 0; | |
49 | inode->i_blksize = PAGE_CACHE_SIZE; | |
50 | inode->i_blocks = 0; | |
51 | inode->i_mapping->backing_dev_info = &relayfs_backing_dev_info; | |
52 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
53 | switch (mode & S_IFMT) { | |
54 | case S_IFREG: | |
907f2c77 | 55 | inode->i_fop = fops; |
51008f9f TZ |
56 | if (data) |
57 | inode->u.generic_ip = data; | |
e82894f8 TZ |
58 | break; |
59 | case S_IFDIR: | |
60 | inode->i_op = &simple_dir_inode_operations; | |
61 | inode->i_fop = &simple_dir_operations; | |
62 | ||
63 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
64 | inode->i_nlink++; | |
65 | break; | |
66 | default: | |
67 | break; | |
68 | } | |
69 | ||
70 | return inode; | |
71 | } | |
72 | ||
73 | /** | |
74 | * relayfs_create_entry - create a relayfs directory or file | |
75 | * @name: the name of the file to create | |
76 | * @parent: parent directory | |
77 | * @mode: mode | |
907f2c77 | 78 | * @fops: file operations to use for the file |
6625b861 | 79 | * @data: user-associated data for this file |
e82894f8 TZ |
80 | * |
81 | * Returns the new dentry, NULL on failure | |
82 | * | |
83 | * Creates a file or directory with the specifed permissions. | |
84 | */ | |
85 | static struct dentry *relayfs_create_entry(const char *name, | |
86 | struct dentry *parent, | |
87 | int mode, | |
907f2c77 | 88 | struct file_operations *fops, |
6625b861 | 89 | void *data) |
e82894f8 TZ |
90 | { |
91 | struct dentry *d; | |
92 | struct inode *inode; | |
93 | int error = 0; | |
94 | ||
95 | BUG_ON(!name || !(S_ISREG(mode) || S_ISDIR(mode))); | |
96 | ||
97 | error = simple_pin_fs("relayfs", &relayfs_mount, &relayfs_mount_count); | |
98 | if (error) { | |
99 | printk(KERN_ERR "Couldn't mount relayfs: errcode %d\n", error); | |
100 | return NULL; | |
101 | } | |
102 | ||
103 | if (!parent && relayfs_mount && relayfs_mount->mnt_sb) | |
104 | parent = relayfs_mount->mnt_sb->s_root; | |
105 | ||
106 | if (!parent) { | |
107 | simple_release_fs(&relayfs_mount, &relayfs_mount_count); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | parent = dget(parent); | |
1b1dcc1b | 112 | mutex_lock(&parent->d_inode->i_mutex); |
e82894f8 TZ |
113 | d = lookup_one_len(name, parent, strlen(name)); |
114 | if (IS_ERR(d)) { | |
115 | d = NULL; | |
116 | goto release_mount; | |
117 | } | |
118 | ||
119 | if (d->d_inode) { | |
120 | d = NULL; | |
121 | goto release_mount; | |
122 | } | |
123 | ||
907f2c77 | 124 | inode = relayfs_get_inode(parent->d_inode->i_sb, mode, fops, data); |
e82894f8 TZ |
125 | if (!inode) { |
126 | d = NULL; | |
127 | goto release_mount; | |
128 | } | |
129 | ||
130 | d_instantiate(d, inode); | |
131 | dget(d); /* Extra count - pin the dentry in core */ | |
132 | ||
133 | if (S_ISDIR(mode)) | |
134 | parent->d_inode->i_nlink++; | |
135 | ||
136 | goto exit; | |
137 | ||
138 | release_mount: | |
139 | simple_release_fs(&relayfs_mount, &relayfs_mount_count); | |
140 | ||
141 | exit: | |
1b1dcc1b | 142 | mutex_unlock(&parent->d_inode->i_mutex); |
e82894f8 TZ |
143 | dput(parent); |
144 | return d; | |
145 | } | |
146 | ||
147 | /** | |
148 | * relayfs_create_file - create a file in the relay filesystem | |
149 | * @name: the name of the file to create | |
150 | * @parent: parent directory | |
151 | * @mode: mode, if not specied the default perms are used | |
907f2c77 | 152 | * @fops: file operations to use for the file |
6625b861 | 153 | * @data: user-associated data for this file |
e82894f8 TZ |
154 | * |
155 | * Returns file dentry if successful, NULL otherwise. | |
156 | * | |
157 | * The file will be created user r on behalf of current user. | |
158 | */ | |
907f2c77 TZ |
159 | struct dentry *relayfs_create_file(const char *name, |
160 | struct dentry *parent, | |
161 | int mode, | |
162 | struct file_operations *fops, | |
163 | void *data) | |
e82894f8 | 164 | { |
907f2c77 TZ |
165 | BUG_ON(!fops); |
166 | ||
e82894f8 TZ |
167 | if (!mode) |
168 | mode = S_IRUSR; | |
169 | mode = (mode & S_IALLUGO) | S_IFREG; | |
170 | ||
907f2c77 | 171 | return relayfs_create_entry(name, parent, mode, fops, data); |
e82894f8 TZ |
172 | } |
173 | ||
174 | /** | |
175 | * relayfs_create_dir - create a directory in the relay filesystem | |
176 | * @name: the name of the directory to create | |
177 | * @parent: parent directory, NULL if parent should be fs root | |
178 | * | |
179 | * Returns directory dentry if successful, NULL otherwise. | |
180 | * | |
181 | * The directory will be created world rwx on behalf of current user. | |
182 | */ | |
183 | struct dentry *relayfs_create_dir(const char *name, struct dentry *parent) | |
184 | { | |
185 | int mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO; | |
907f2c77 | 186 | return relayfs_create_entry(name, parent, mode, NULL, NULL); |
e82894f8 TZ |
187 | } |
188 | ||
189 | /** | |
190 | * relayfs_remove - remove a file or directory in the relay filesystem | |
191 | * @dentry: file or directory dentry | |
192 | * | |
193 | * Returns 0 if successful, negative otherwise. | |
194 | */ | |
195 | int relayfs_remove(struct dentry *dentry) | |
196 | { | |
197 | struct dentry *parent; | |
198 | int error = 0; | |
199 | ||
200 | if (!dentry) | |
201 | return -EINVAL; | |
202 | parent = dentry->d_parent; | |
203 | if (!parent) | |
204 | return -EINVAL; | |
205 | ||
206 | parent = dget(parent); | |
1b1dcc1b | 207 | mutex_lock(&parent->d_inode->i_mutex); |
e82894f8 TZ |
208 | if (dentry->d_inode) { |
209 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
210 | error = simple_rmdir(parent->d_inode, dentry); | |
211 | else | |
212 | error = simple_unlink(parent->d_inode, dentry); | |
213 | if (!error) | |
214 | d_delete(dentry); | |
215 | } | |
216 | if (!error) | |
217 | dput(dentry); | |
1b1dcc1b | 218 | mutex_unlock(&parent->d_inode->i_mutex); |
e82894f8 TZ |
219 | dput(parent); |
220 | ||
221 | if (!error) | |
222 | simple_release_fs(&relayfs_mount, &relayfs_mount_count); | |
223 | ||
224 | return error; | |
225 | } | |
226 | ||
74317337 TZ |
227 | /** |
228 | * relayfs_remove_file - remove a file from relay filesystem | |
229 | * @dentry: directory dentry | |
230 | * | |
231 | * Returns 0 if successful, negative otherwise. | |
232 | */ | |
233 | int relayfs_remove_file(struct dentry *dentry) | |
234 | { | |
235 | return relayfs_remove(dentry); | |
236 | } | |
237 | ||
e82894f8 TZ |
238 | /** |
239 | * relayfs_remove_dir - remove a directory in the relay filesystem | |
240 | * @dentry: directory dentry | |
241 | * | |
242 | * Returns 0 if successful, negative otherwise. | |
243 | */ | |
244 | int relayfs_remove_dir(struct dentry *dentry) | |
245 | { | |
246 | return relayfs_remove(dentry); | |
247 | } | |
248 | ||
249 | /** | |
761da5c8 | 250 | * relay_file_open - open file op for relay files |
e82894f8 TZ |
251 | * @inode: the inode |
252 | * @filp: the file | |
253 | * | |
254 | * Increments the channel buffer refcount. | |
255 | */ | |
761da5c8 | 256 | static int relay_file_open(struct inode *inode, struct file *filp) |
e82894f8 | 257 | { |
51008f9f | 258 | struct rchan_buf *buf = inode->u.generic_ip; |
e82894f8 | 259 | kref_get(&buf->kref); |
51008f9f | 260 | filp->private_data = buf; |
e82894f8 TZ |
261 | |
262 | return 0; | |
263 | } | |
264 | ||
265 | /** | |
761da5c8 | 266 | * relay_file_mmap - mmap file op for relay files |
e82894f8 TZ |
267 | * @filp: the file |
268 | * @vma: the vma describing what to map | |
269 | * | |
270 | * Calls upon relay_mmap_buf to map the file into user space. | |
271 | */ | |
761da5c8 | 272 | static int relay_file_mmap(struct file *filp, struct vm_area_struct *vma) |
e82894f8 | 273 | { |
51008f9f TZ |
274 | struct rchan_buf *buf = filp->private_data; |
275 | return relay_mmap_buf(buf, vma); | |
e82894f8 TZ |
276 | } |
277 | ||
278 | /** | |
761da5c8 | 279 | * relay_file_poll - poll file op for relay files |
e82894f8 TZ |
280 | * @filp: the file |
281 | * @wait: poll table | |
282 | * | |
283 | * Poll implemention. | |
284 | */ | |
761da5c8 | 285 | static unsigned int relay_file_poll(struct file *filp, poll_table *wait) |
e82894f8 TZ |
286 | { |
287 | unsigned int mask = 0; | |
51008f9f | 288 | struct rchan_buf *buf = filp->private_data; |
e82894f8 TZ |
289 | |
290 | if (buf->finalized) | |
291 | return POLLERR; | |
292 | ||
293 | if (filp->f_mode & FMODE_READ) { | |
294 | poll_wait(filp, &buf->read_wait, wait); | |
295 | if (!relay_buf_empty(buf)) | |
296 | mask |= POLLIN | POLLRDNORM; | |
297 | } | |
298 | ||
299 | return mask; | |
300 | } | |
301 | ||
302 | /** | |
761da5c8 | 303 | * relay_file_release - release file op for relay files |
e82894f8 TZ |
304 | * @inode: the inode |
305 | * @filp: the file | |
306 | * | |
307 | * Decrements the channel refcount, as the filesystem is | |
308 | * no longer using it. | |
309 | */ | |
761da5c8 | 310 | static int relay_file_release(struct inode *inode, struct file *filp) |
e82894f8 | 311 | { |
51008f9f | 312 | struct rchan_buf *buf = filp->private_data; |
e82894f8 TZ |
313 | kref_put(&buf->kref, relay_remove_buf); |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | /** | |
761da5c8 | 319 | * relay_file_read_consume - update the consumed count for the buffer |
e82894f8 | 320 | */ |
761da5c8 TZ |
321 | static void relay_file_read_consume(struct rchan_buf *buf, |
322 | size_t read_pos, | |
323 | size_t bytes_consumed) | |
e82894f8 TZ |
324 | { |
325 | size_t subbuf_size = buf->chan->subbuf_size; | |
326 | size_t n_subbufs = buf->chan->n_subbufs; | |
327 | size_t read_subbuf; | |
328 | ||
329 | if (buf->bytes_consumed + bytes_consumed > subbuf_size) { | |
330 | relay_subbufs_consumed(buf->chan, buf->cpu, 1); | |
331 | buf->bytes_consumed = 0; | |
332 | } | |
333 | ||
334 | buf->bytes_consumed += bytes_consumed; | |
335 | read_subbuf = read_pos / buf->chan->subbuf_size; | |
336 | if (buf->bytes_consumed + buf->padding[read_subbuf] == subbuf_size) { | |
337 | if ((read_subbuf == buf->subbufs_produced % n_subbufs) && | |
338 | (buf->offset == subbuf_size)) | |
339 | return; | |
340 | relay_subbufs_consumed(buf->chan, buf->cpu, 1); | |
341 | buf->bytes_consumed = 0; | |
342 | } | |
343 | } | |
344 | ||
345 | /** | |
761da5c8 | 346 | * relay_file_read_avail - boolean, are there unconsumed bytes available? |
e82894f8 | 347 | */ |
761da5c8 | 348 | static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos) |
e82894f8 TZ |
349 | { |
350 | size_t bytes_produced, bytes_consumed, write_offset; | |
351 | size_t subbuf_size = buf->chan->subbuf_size; | |
352 | size_t n_subbufs = buf->chan->n_subbufs; | |
353 | size_t produced = buf->subbufs_produced % n_subbufs; | |
354 | size_t consumed = buf->subbufs_consumed % n_subbufs; | |
355 | ||
356 | write_offset = buf->offset > subbuf_size ? subbuf_size : buf->offset; | |
357 | ||
358 | if (consumed > produced) { | |
359 | if ((produced > n_subbufs) && | |
360 | (produced + n_subbufs - consumed <= n_subbufs)) | |
361 | produced += n_subbufs; | |
362 | } else if (consumed == produced) { | |
363 | if (buf->offset > subbuf_size) { | |
364 | produced += n_subbufs; | |
365 | if (buf->subbufs_produced == buf->subbufs_consumed) | |
366 | consumed += n_subbufs; | |
367 | } | |
368 | } | |
369 | ||
370 | if (buf->offset > subbuf_size) | |
371 | bytes_produced = (produced - 1) * subbuf_size + write_offset; | |
372 | else | |
373 | bytes_produced = produced * subbuf_size + write_offset; | |
374 | bytes_consumed = consumed * subbuf_size + buf->bytes_consumed; | |
375 | ||
376 | if (bytes_produced == bytes_consumed) | |
377 | return 0; | |
378 | ||
761da5c8 | 379 | relay_file_read_consume(buf, read_pos, 0); |
e82894f8 TZ |
380 | |
381 | return 1; | |
382 | } | |
383 | ||
384 | /** | |
761da5c8 | 385 | * relay_file_read_subbuf_avail - return bytes available in sub-buffer |
e82894f8 | 386 | */ |
761da5c8 TZ |
387 | static size_t relay_file_read_subbuf_avail(size_t read_pos, |
388 | struct rchan_buf *buf) | |
e82894f8 TZ |
389 | { |
390 | size_t padding, avail = 0; | |
391 | size_t read_subbuf, read_offset, write_subbuf, write_offset; | |
392 | size_t subbuf_size = buf->chan->subbuf_size; | |
393 | ||
394 | write_subbuf = (buf->data - buf->start) / subbuf_size; | |
395 | write_offset = buf->offset > subbuf_size ? subbuf_size : buf->offset; | |
396 | read_subbuf = read_pos / subbuf_size; | |
397 | read_offset = read_pos % subbuf_size; | |
398 | padding = buf->padding[read_subbuf]; | |
399 | ||
400 | if (read_subbuf == write_subbuf) { | |
401 | if (read_offset + padding < write_offset) | |
402 | avail = write_offset - (read_offset + padding); | |
403 | } else | |
404 | avail = (subbuf_size - padding) - read_offset; | |
405 | ||
406 | return avail; | |
407 | } | |
408 | ||
409 | /** | |
761da5c8 | 410 | * relay_file_read_start_pos - find the first available byte to read |
e82894f8 TZ |
411 | * |
412 | * If the read_pos is in the middle of padding, return the | |
413 | * position of the first actually available byte, otherwise | |
414 | * return the original value. | |
415 | */ | |
761da5c8 TZ |
416 | static size_t relay_file_read_start_pos(size_t read_pos, |
417 | struct rchan_buf *buf) | |
e82894f8 TZ |
418 | { |
419 | size_t read_subbuf, padding, padding_start, padding_end; | |
420 | size_t subbuf_size = buf->chan->subbuf_size; | |
421 | size_t n_subbufs = buf->chan->n_subbufs; | |
422 | ||
423 | read_subbuf = read_pos / subbuf_size; | |
424 | padding = buf->padding[read_subbuf]; | |
425 | padding_start = (read_subbuf + 1) * subbuf_size - padding; | |
426 | padding_end = (read_subbuf + 1) * subbuf_size; | |
427 | if (read_pos >= padding_start && read_pos < padding_end) { | |
428 | read_subbuf = (read_subbuf + 1) % n_subbufs; | |
429 | read_pos = read_subbuf * subbuf_size; | |
430 | } | |
431 | ||
432 | return read_pos; | |
433 | } | |
434 | ||
435 | /** | |
761da5c8 | 436 | * relay_file_read_end_pos - return the new read position |
e82894f8 | 437 | */ |
761da5c8 TZ |
438 | static size_t relay_file_read_end_pos(struct rchan_buf *buf, |
439 | size_t read_pos, | |
440 | size_t count) | |
e82894f8 TZ |
441 | { |
442 | size_t read_subbuf, padding, end_pos; | |
443 | size_t subbuf_size = buf->chan->subbuf_size; | |
444 | size_t n_subbufs = buf->chan->n_subbufs; | |
445 | ||
446 | read_subbuf = read_pos / subbuf_size; | |
447 | padding = buf->padding[read_subbuf]; | |
448 | if (read_pos % subbuf_size + count + padding == subbuf_size) | |
449 | end_pos = (read_subbuf + 1) * subbuf_size; | |
450 | else | |
451 | end_pos = read_pos + count; | |
452 | if (end_pos >= subbuf_size * n_subbufs) | |
453 | end_pos = 0; | |
454 | ||
455 | return end_pos; | |
456 | } | |
457 | ||
458 | /** | |
761da5c8 | 459 | * relay_file_read - read file op for relay files |
e82894f8 TZ |
460 | * @filp: the file |
461 | * @buffer: the userspace buffer | |
462 | * @count: number of bytes to read | |
463 | * @ppos: position to read from | |
464 | * | |
465 | * Reads count bytes or the number of bytes available in the | |
466 | * current sub-buffer being read, whichever is smaller. | |
467 | */ | |
761da5c8 TZ |
468 | static ssize_t relay_file_read(struct file *filp, |
469 | char __user *buffer, | |
470 | size_t count, | |
471 | loff_t *ppos) | |
e82894f8 | 472 | { |
51008f9f | 473 | struct rchan_buf *buf = filp->private_data; |
e82894f8 | 474 | struct inode *inode = filp->f_dentry->d_inode; |
e82894f8 TZ |
475 | size_t read_start, avail; |
476 | ssize_t ret = 0; | |
477 | void *from; | |
478 | ||
1b1dcc1b | 479 | mutex_lock(&inode->i_mutex); |
761da5c8 | 480 | if(!relay_file_read_avail(buf, *ppos)) |
e82894f8 TZ |
481 | goto out; |
482 | ||
761da5c8 TZ |
483 | read_start = relay_file_read_start_pos(*ppos, buf); |
484 | avail = relay_file_read_subbuf_avail(read_start, buf); | |
e82894f8 TZ |
485 | if (!avail) |
486 | goto out; | |
487 | ||
488 | from = buf->start + read_start; | |
489 | ret = count = min(count, avail); | |
490 | if (copy_to_user(buffer, from, count)) { | |
491 | ret = -EFAULT; | |
492 | goto out; | |
493 | } | |
761da5c8 TZ |
494 | relay_file_read_consume(buf, read_start, count); |
495 | *ppos = relay_file_read_end_pos(buf, read_start, count); | |
e82894f8 | 496 | out: |
1b1dcc1b | 497 | mutex_unlock(&inode->i_mutex); |
e82894f8 TZ |
498 | return ret; |
499 | } | |
500 | ||
761da5c8 TZ |
501 | struct file_operations relay_file_operations = { |
502 | .open = relay_file_open, | |
503 | .poll = relay_file_poll, | |
504 | .mmap = relay_file_mmap, | |
505 | .read = relay_file_read, | |
e82894f8 | 506 | .llseek = no_llseek, |
761da5c8 | 507 | .release = relay_file_release, |
e82894f8 TZ |
508 | }; |
509 | ||
510 | static struct super_operations relayfs_ops = { | |
511 | .statfs = simple_statfs, | |
512 | .drop_inode = generic_delete_inode, | |
e82894f8 TZ |
513 | }; |
514 | ||
515 | static int relayfs_fill_super(struct super_block * sb, void * data, int silent) | |
516 | { | |
517 | struct inode *inode; | |
518 | struct dentry *root; | |
519 | int mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO; | |
520 | ||
521 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
522 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
523 | sb->s_magic = RELAYFS_MAGIC; | |
524 | sb->s_op = &relayfs_ops; | |
907f2c77 | 525 | inode = relayfs_get_inode(sb, mode, NULL, NULL); |
e82894f8 TZ |
526 | |
527 | if (!inode) | |
528 | return -ENOMEM; | |
529 | ||
530 | root = d_alloc_root(inode); | |
531 | if (!root) { | |
532 | iput(inode); | |
533 | return -ENOMEM; | |
534 | } | |
535 | sb->s_root = root; | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | static struct super_block * relayfs_get_sb(struct file_system_type *fs_type, | |
541 | int flags, const char *dev_name, | |
542 | void *data) | |
543 | { | |
544 | return get_sb_single(fs_type, flags, data, relayfs_fill_super); | |
545 | } | |
546 | ||
547 | static struct file_system_type relayfs_fs_type = { | |
548 | .owner = THIS_MODULE, | |
549 | .name = "relayfs", | |
550 | .get_sb = relayfs_get_sb, | |
551 | .kill_sb = kill_litter_super, | |
552 | }; | |
553 | ||
554 | static int __init init_relayfs_fs(void) | |
555 | { | |
aaea25d7 | 556 | return register_filesystem(&relayfs_fs_type); |
e82894f8 TZ |
557 | } |
558 | ||
559 | static void __exit exit_relayfs_fs(void) | |
560 | { | |
761da5c8 TZ |
561 | |
562 | ||
563 | ||
564 | ||
565 | ||
e82894f8 | 566 | unregister_filesystem(&relayfs_fs_type); |
e82894f8 TZ |
567 | } |
568 | ||
569 | module_init(init_relayfs_fs) | |
570 | module_exit(exit_relayfs_fs) | |
571 | ||
761da5c8 | 572 | EXPORT_SYMBOL_GPL(relay_file_operations); |
e82894f8 TZ |
573 | EXPORT_SYMBOL_GPL(relayfs_create_dir); |
574 | EXPORT_SYMBOL_GPL(relayfs_remove_dir); | |
907f2c77 | 575 | EXPORT_SYMBOL_GPL(relayfs_create_file); |
74317337 | 576 | EXPORT_SYMBOL_GPL(relayfs_remove_file); |
e82894f8 TZ |
577 | |
578 | MODULE_AUTHOR("Tom Zanussi <zanussi@us.ibm.com> and Karim Yaghmour <karim@opersys.com>"); | |
579 | MODULE_DESCRIPTION("Relay Filesystem"); | |
580 | MODULE_LICENSE("GPL"); | |
581 |