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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Compressed rom filesystem for Linux. | |
3 | * | |
4 | * Copyright (C) 1999 Linus Torvalds. | |
5 | * | |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
9 | /* | |
10 | * These are the VFS interfaces to the compressed rom filesystem. | |
11 | * The actual compression is based on zlib, see the other files. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/blkdev.h> | |
20 | #include <linux/cramfs_fs.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/cramfs_fs_sb.h> | |
23 | #include <linux/buffer_head.h> | |
24 | #include <linux/vfs.h> | |
353ab6e9 | 25 | #include <linux/mutex.h> |
1da177e4 LT |
26 | #include <asm/semaphore.h> |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | ||
30 | static struct super_operations cramfs_ops; | |
31 | static struct inode_operations cramfs_dir_inode_operations; | |
4b6f5d20 | 32 | static const struct file_operations cramfs_directory_operations; |
f5e54d6e | 33 | static const struct address_space_operations cramfs_aops; |
1da177e4 | 34 | |
353ab6e9 | 35 | static DEFINE_MUTEX(read_mutex); |
1da177e4 LT |
36 | |
37 | ||
38 | /* These two macros may change in future, to provide better st_ino | |
39 | semantics. */ | |
ff3aea0e | 40 | #define CRAMINO(x) (((x)->offset && (x)->size)?(x)->offset<<2:1) |
1da177e4 LT |
41 | #define OFFSET(x) ((x)->i_ino) |
42 | ||
a97c9bf3 DJ |
43 | |
44 | static int cramfs_iget5_test(struct inode *inode, void *opaque) | |
45 | { | |
46 | struct cramfs_inode *cramfs_inode = opaque; | |
47 | ||
48 | if (inode->i_ino != CRAMINO(cramfs_inode)) | |
49 | return 0; /* does not match */ | |
50 | ||
51 | if (inode->i_ino != 1) | |
52 | return 1; | |
53 | ||
54 | /* all empty directories, char, block, pipe, and sock, share inode #1 */ | |
55 | ||
56 | if ((inode->i_mode != cramfs_inode->mode) || | |
57 | (inode->i_gid != cramfs_inode->gid) || | |
58 | (inode->i_uid != cramfs_inode->uid)) | |
59 | return 0; /* does not match */ | |
60 | ||
61 | if ((S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) && | |
62 | (inode->i_rdev != old_decode_dev(cramfs_inode->size))) | |
63 | return 0; /* does not match */ | |
64 | ||
65 | return 1; /* matches */ | |
66 | } | |
67 | ||
68 | static int cramfs_iget5_set(struct inode *inode, void *opaque) | |
69 | { | |
ff3aea0e | 70 | static struct timespec zerotime; |
a97c9bf3 | 71 | struct cramfs_inode *cramfs_inode = opaque; |
ff3aea0e DJ |
72 | inode->i_mode = cramfs_inode->mode; |
73 | inode->i_uid = cramfs_inode->uid; | |
74 | inode->i_size = cramfs_inode->size; | |
75 | inode->i_blocks = (cramfs_inode->size - 1) / 512 + 1; | |
76 | inode->i_blksize = PAGE_CACHE_SIZE; | |
77 | inode->i_gid = cramfs_inode->gid; | |
78 | /* Struct copy intentional */ | |
79 | inode->i_mtime = inode->i_atime = inode->i_ctime = zerotime; | |
a97c9bf3 | 80 | inode->i_ino = CRAMINO(cramfs_inode); |
ff3aea0e DJ |
81 | /* inode->i_nlink is left 1 - arguably wrong for directories, |
82 | but it's the best we can do without reading the directory | |
83 | contents. 1 yields the right result in GNU find, even | |
84 | without -noleaf option. */ | |
85 | if (S_ISREG(inode->i_mode)) { | |
86 | inode->i_fop = &generic_ro_fops; | |
87 | inode->i_data.a_ops = &cramfs_aops; | |
88 | } else if (S_ISDIR(inode->i_mode)) { | |
89 | inode->i_op = &cramfs_dir_inode_operations; | |
90 | inode->i_fop = &cramfs_directory_operations; | |
91 | } else if (S_ISLNK(inode->i_mode)) { | |
92 | inode->i_op = &page_symlink_inode_operations; | |
93 | inode->i_data.a_ops = &cramfs_aops; | |
94 | } else { | |
95 | inode->i_size = 0; | |
96 | inode->i_blocks = 0; | |
97 | init_special_inode(inode, inode->i_mode, | |
98 | old_decode_dev(cramfs_inode->size)); | |
99 | } | |
a97c9bf3 DJ |
100 | return 0; |
101 | } | |
102 | ||
103 | static struct inode *get_cramfs_inode(struct super_block *sb, | |
104 | struct cramfs_inode * cramfs_inode) | |
1da177e4 | 105 | { |
a97c9bf3 DJ |
106 | struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode), |
107 | cramfs_iget5_test, cramfs_iget5_set, | |
108 | cramfs_inode); | |
a97c9bf3 | 109 | if (inode && (inode->i_state & I_NEW)) { |
a97c9bf3 | 110 | unlock_new_inode(inode); |
1da177e4 LT |
111 | } |
112 | return inode; | |
113 | } | |
114 | ||
115 | /* | |
116 | * We have our own block cache: don't fill up the buffer cache | |
117 | * with the rom-image, because the way the filesystem is set | |
118 | * up the accesses should be fairly regular and cached in the | |
119 | * page cache and dentry tree anyway.. | |
120 | * | |
121 | * This also acts as a way to guarantee contiguous areas of up to | |
122 | * BLKS_PER_BUF*PAGE_CACHE_SIZE, so that the caller doesn't need to | |
123 | * worry about end-of-buffer issues even when decompressing a full | |
124 | * page cache. | |
125 | */ | |
126 | #define READ_BUFFERS (2) | |
127 | /* NEXT_BUFFER(): Loop over [0..(READ_BUFFERS-1)]. */ | |
128 | #define NEXT_BUFFER(_ix) ((_ix) ^ 1) | |
129 | ||
130 | /* | |
131 | * BLKS_PER_BUF_SHIFT should be at least 2 to allow for "compressed" | |
132 | * data that takes up more space than the original and with unlucky | |
133 | * alignment. | |
134 | */ | |
135 | #define BLKS_PER_BUF_SHIFT (2) | |
136 | #define BLKS_PER_BUF (1 << BLKS_PER_BUF_SHIFT) | |
137 | #define BUFFER_SIZE (BLKS_PER_BUF*PAGE_CACHE_SIZE) | |
138 | ||
139 | static unsigned char read_buffers[READ_BUFFERS][BUFFER_SIZE]; | |
140 | static unsigned buffer_blocknr[READ_BUFFERS]; | |
141 | static struct super_block * buffer_dev[READ_BUFFERS]; | |
142 | static int next_buffer; | |
143 | ||
144 | /* | |
145 | * Returns a pointer to a buffer containing at least LEN bytes of | |
146 | * filesystem starting at byte offset OFFSET into the filesystem. | |
147 | */ | |
148 | static void *cramfs_read(struct super_block *sb, unsigned int offset, unsigned int len) | |
149 | { | |
150 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; | |
151 | struct page *pages[BLKS_PER_BUF]; | |
152 | unsigned i, blocknr, buffer, unread; | |
153 | unsigned long devsize; | |
154 | char *data; | |
155 | ||
156 | if (!len) | |
157 | return NULL; | |
158 | blocknr = offset >> PAGE_CACHE_SHIFT; | |
159 | offset &= PAGE_CACHE_SIZE - 1; | |
160 | ||
161 | /* Check if an existing buffer already has the data.. */ | |
162 | for (i = 0; i < READ_BUFFERS; i++) { | |
163 | unsigned int blk_offset; | |
164 | ||
165 | if (buffer_dev[i] != sb) | |
166 | continue; | |
167 | if (blocknr < buffer_blocknr[i]) | |
168 | continue; | |
169 | blk_offset = (blocknr - buffer_blocknr[i]) << PAGE_CACHE_SHIFT; | |
170 | blk_offset += offset; | |
171 | if (blk_offset + len > BUFFER_SIZE) | |
172 | continue; | |
173 | return read_buffers[i] + blk_offset; | |
174 | } | |
175 | ||
176 | devsize = mapping->host->i_size >> PAGE_CACHE_SHIFT; | |
177 | ||
178 | /* Ok, read in BLKS_PER_BUF pages completely first. */ | |
179 | unread = 0; | |
180 | for (i = 0; i < BLKS_PER_BUF; i++) { | |
181 | struct page *page = NULL; | |
182 | ||
183 | if (blocknr + i < devsize) { | |
090d2b18 | 184 | page = read_mapping_page(mapping, blocknr + i, NULL); |
1da177e4 LT |
185 | /* synchronous error? */ |
186 | if (IS_ERR(page)) | |
187 | page = NULL; | |
188 | } | |
189 | pages[i] = page; | |
190 | } | |
191 | ||
192 | for (i = 0; i < BLKS_PER_BUF; i++) { | |
193 | struct page *page = pages[i]; | |
194 | if (page) { | |
195 | wait_on_page_locked(page); | |
196 | if (!PageUptodate(page)) { | |
197 | /* asynchronous error */ | |
198 | page_cache_release(page); | |
199 | pages[i] = NULL; | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
204 | buffer = next_buffer; | |
205 | next_buffer = NEXT_BUFFER(buffer); | |
206 | buffer_blocknr[buffer] = blocknr; | |
207 | buffer_dev[buffer] = sb; | |
208 | ||
209 | data = read_buffers[buffer]; | |
210 | for (i = 0; i < BLKS_PER_BUF; i++) { | |
211 | struct page *page = pages[i]; | |
212 | if (page) { | |
213 | memcpy(data, kmap(page), PAGE_CACHE_SIZE); | |
214 | kunmap(page); | |
215 | page_cache_release(page); | |
216 | } else | |
217 | memset(data, 0, PAGE_CACHE_SIZE); | |
218 | data += PAGE_CACHE_SIZE; | |
219 | } | |
220 | return read_buffers[buffer] + offset; | |
221 | } | |
222 | ||
223 | static void cramfs_put_super(struct super_block *sb) | |
224 | { | |
225 | kfree(sb->s_fs_info); | |
226 | sb->s_fs_info = NULL; | |
227 | } | |
228 | ||
229 | static int cramfs_remount(struct super_block *sb, int *flags, char *data) | |
230 | { | |
231 | *flags |= MS_RDONLY; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int cramfs_fill_super(struct super_block *sb, void *data, int silent) | |
236 | { | |
237 | int i; | |
238 | struct cramfs_super super; | |
239 | unsigned long root_offset; | |
240 | struct cramfs_sb_info *sbi; | |
241 | struct inode *root; | |
242 | ||
243 | sb->s_flags |= MS_RDONLY; | |
244 | ||
f8314dc6 | 245 | sbi = kzalloc(sizeof(struct cramfs_sb_info), GFP_KERNEL); |
1da177e4 LT |
246 | if (!sbi) |
247 | return -ENOMEM; | |
248 | sb->s_fs_info = sbi; | |
1da177e4 LT |
249 | |
250 | /* Invalidate the read buffers on mount: think disk change.. */ | |
353ab6e9 | 251 | mutex_lock(&read_mutex); |
1da177e4 LT |
252 | for (i = 0; i < READ_BUFFERS; i++) |
253 | buffer_blocknr[i] = -1; | |
254 | ||
255 | /* Read the first block and get the superblock from it */ | |
256 | memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super)); | |
353ab6e9 | 257 | mutex_unlock(&read_mutex); |
1da177e4 LT |
258 | |
259 | /* Do sanity checks on the superblock */ | |
260 | if (super.magic != CRAMFS_MAGIC) { | |
261 | /* check at 512 byte offset */ | |
353ab6e9 | 262 | mutex_lock(&read_mutex); |
1da177e4 | 263 | memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super)); |
353ab6e9 | 264 | mutex_unlock(&read_mutex); |
1da177e4 LT |
265 | if (super.magic != CRAMFS_MAGIC) { |
266 | if (!silent) | |
267 | printk(KERN_ERR "cramfs: wrong magic\n"); | |
268 | goto out; | |
269 | } | |
270 | } | |
271 | ||
272 | /* get feature flags first */ | |
273 | if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) { | |
274 | printk(KERN_ERR "cramfs: unsupported filesystem features\n"); | |
275 | goto out; | |
276 | } | |
277 | ||
278 | /* Check that the root inode is in a sane state */ | |
279 | if (!S_ISDIR(super.root.mode)) { | |
280 | printk(KERN_ERR "cramfs: root is not a directory\n"); | |
281 | goto out; | |
282 | } | |
283 | root_offset = super.root.offset << 2; | |
284 | if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) { | |
285 | sbi->size=super.size; | |
286 | sbi->blocks=super.fsid.blocks; | |
287 | sbi->files=super.fsid.files; | |
288 | } else { | |
289 | sbi->size=1<<28; | |
290 | sbi->blocks=0; | |
291 | sbi->files=0; | |
292 | } | |
293 | sbi->magic=super.magic; | |
294 | sbi->flags=super.flags; | |
295 | if (root_offset == 0) | |
296 | printk(KERN_INFO "cramfs: empty filesystem"); | |
297 | else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) && | |
298 | ((root_offset != sizeof(struct cramfs_super)) && | |
299 | (root_offset != 512 + sizeof(struct cramfs_super)))) | |
300 | { | |
301 | printk(KERN_ERR "cramfs: bad root offset %lu\n", root_offset); | |
302 | goto out; | |
303 | } | |
304 | ||
305 | /* Set it all up.. */ | |
306 | sb->s_op = &cramfs_ops; | |
307 | root = get_cramfs_inode(sb, &super.root); | |
308 | if (!root) | |
309 | goto out; | |
310 | sb->s_root = d_alloc_root(root); | |
311 | if (!sb->s_root) { | |
312 | iput(root); | |
313 | goto out; | |
314 | } | |
315 | return 0; | |
316 | out: | |
317 | kfree(sbi); | |
318 | sb->s_fs_info = NULL; | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
726c3342 | 322 | static int cramfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 323 | { |
726c3342 DH |
324 | struct super_block *sb = dentry->d_sb; |
325 | ||
1da177e4 LT |
326 | buf->f_type = CRAMFS_MAGIC; |
327 | buf->f_bsize = PAGE_CACHE_SIZE; | |
328 | buf->f_blocks = CRAMFS_SB(sb)->blocks; | |
329 | buf->f_bfree = 0; | |
330 | buf->f_bavail = 0; | |
331 | buf->f_files = CRAMFS_SB(sb)->files; | |
332 | buf->f_ffree = 0; | |
333 | buf->f_namelen = CRAMFS_MAXPATHLEN; | |
334 | return 0; | |
335 | } | |
336 | ||
337 | /* | |
338 | * Read a cramfs directory entry. | |
339 | */ | |
340 | static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
341 | { | |
342 | struct inode *inode = filp->f_dentry->d_inode; | |
343 | struct super_block *sb = inode->i_sb; | |
344 | char *buf; | |
345 | unsigned int offset; | |
346 | int copied; | |
347 | ||
348 | /* Offset within the thing. */ | |
349 | offset = filp->f_pos; | |
350 | if (offset >= inode->i_size) | |
351 | return 0; | |
352 | /* Directory entries are always 4-byte aligned */ | |
353 | if (offset & 3) | |
354 | return -EINVAL; | |
355 | ||
356 | buf = kmalloc(256, GFP_KERNEL); | |
357 | if (!buf) | |
358 | return -ENOMEM; | |
359 | ||
360 | copied = 0; | |
361 | while (offset < inode->i_size) { | |
362 | struct cramfs_inode *de; | |
363 | unsigned long nextoffset; | |
364 | char *name; | |
365 | ino_t ino; | |
366 | mode_t mode; | |
367 | int namelen, error; | |
368 | ||
353ab6e9 | 369 | mutex_lock(&read_mutex); |
1da177e4 LT |
370 | de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+256); |
371 | name = (char *)(de+1); | |
372 | ||
373 | /* | |
374 | * Namelengths on disk are shifted by two | |
375 | * and the name padded out to 4-byte boundaries | |
376 | * with zeroes. | |
377 | */ | |
378 | namelen = de->namelen << 2; | |
379 | memcpy(buf, name, namelen); | |
380 | ino = CRAMINO(de); | |
381 | mode = de->mode; | |
353ab6e9 | 382 | mutex_unlock(&read_mutex); |
1da177e4 LT |
383 | nextoffset = offset + sizeof(*de) + namelen; |
384 | for (;;) { | |
385 | if (!namelen) { | |
386 | kfree(buf); | |
387 | return -EIO; | |
388 | } | |
389 | if (buf[namelen-1]) | |
390 | break; | |
391 | namelen--; | |
392 | } | |
393 | error = filldir(dirent, buf, namelen, offset, ino, mode >> 12); | |
394 | if (error) | |
395 | break; | |
396 | ||
397 | offset = nextoffset; | |
398 | filp->f_pos = offset; | |
399 | copied++; | |
400 | } | |
401 | kfree(buf); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Lookup and fill in the inode data.. | |
407 | */ | |
408 | static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
409 | { | |
410 | unsigned int offset = 0; | |
411 | int sorted; | |
412 | ||
353ab6e9 | 413 | mutex_lock(&read_mutex); |
1da177e4 LT |
414 | sorted = CRAMFS_SB(dir->i_sb)->flags & CRAMFS_FLAG_SORTED_DIRS; |
415 | while (offset < dir->i_size) { | |
416 | struct cramfs_inode *de; | |
417 | char *name; | |
418 | int namelen, retval; | |
419 | ||
420 | de = cramfs_read(dir->i_sb, OFFSET(dir) + offset, sizeof(*de)+256); | |
421 | name = (char *)(de+1); | |
422 | ||
423 | /* Try to take advantage of sorted directories */ | |
424 | if (sorted && (dentry->d_name.name[0] < name[0])) | |
425 | break; | |
426 | ||
427 | namelen = de->namelen << 2; | |
428 | offset += sizeof(*de) + namelen; | |
429 | ||
430 | /* Quick check that the name is roughly the right length */ | |
431 | if (((dentry->d_name.len + 3) & ~3) != namelen) | |
432 | continue; | |
433 | ||
434 | for (;;) { | |
435 | if (!namelen) { | |
353ab6e9 | 436 | mutex_unlock(&read_mutex); |
1da177e4 LT |
437 | return ERR_PTR(-EIO); |
438 | } | |
439 | if (name[namelen-1]) | |
440 | break; | |
441 | namelen--; | |
442 | } | |
443 | if (namelen != dentry->d_name.len) | |
444 | continue; | |
445 | retval = memcmp(dentry->d_name.name, name, namelen); | |
446 | if (retval > 0) | |
447 | continue; | |
448 | if (!retval) { | |
449 | struct cramfs_inode entry = *de; | |
353ab6e9 | 450 | mutex_unlock(&read_mutex); |
1da177e4 LT |
451 | d_add(dentry, get_cramfs_inode(dir->i_sb, &entry)); |
452 | return NULL; | |
453 | } | |
454 | /* else (retval < 0) */ | |
455 | if (sorted) | |
456 | break; | |
457 | } | |
353ab6e9 | 458 | mutex_unlock(&read_mutex); |
1da177e4 LT |
459 | d_add(dentry, NULL); |
460 | return NULL; | |
461 | } | |
462 | ||
463 | static int cramfs_readpage(struct file *file, struct page * page) | |
464 | { | |
465 | struct inode *inode = page->mapping->host; | |
466 | u32 maxblock, bytes_filled; | |
467 | void *pgdata; | |
468 | ||
469 | maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
470 | bytes_filled = 0; | |
471 | if (page->index < maxblock) { | |
472 | struct super_block *sb = inode->i_sb; | |
473 | u32 blkptr_offset = OFFSET(inode) + page->index*4; | |
474 | u32 start_offset, compr_len; | |
475 | ||
476 | start_offset = OFFSET(inode) + maxblock*4; | |
353ab6e9 | 477 | mutex_lock(&read_mutex); |
1da177e4 LT |
478 | if (page->index) |
479 | start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4); | |
480 | compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - start_offset); | |
353ab6e9 | 481 | mutex_unlock(&read_mutex); |
1da177e4 LT |
482 | pgdata = kmap(page); |
483 | if (compr_len == 0) | |
484 | ; /* hole */ | |
485 | else { | |
353ab6e9 | 486 | mutex_lock(&read_mutex); |
1da177e4 LT |
487 | bytes_filled = cramfs_uncompress_block(pgdata, |
488 | PAGE_CACHE_SIZE, | |
489 | cramfs_read(sb, start_offset, compr_len), | |
490 | compr_len); | |
353ab6e9 | 491 | mutex_unlock(&read_mutex); |
1da177e4 LT |
492 | } |
493 | } else | |
494 | pgdata = kmap(page); | |
495 | memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled); | |
496 | kunmap(page); | |
497 | flush_dcache_page(page); | |
498 | SetPageUptodate(page); | |
499 | unlock_page(page); | |
500 | return 0; | |
501 | } | |
502 | ||
f5e54d6e | 503 | static const struct address_space_operations cramfs_aops = { |
1da177e4 LT |
504 | .readpage = cramfs_readpage |
505 | }; | |
506 | ||
507 | /* | |
508 | * Our operations: | |
509 | */ | |
510 | ||
511 | /* | |
512 | * A directory can only readdir | |
513 | */ | |
4b6f5d20 | 514 | static const struct file_operations cramfs_directory_operations = { |
1da177e4 LT |
515 | .llseek = generic_file_llseek, |
516 | .read = generic_read_dir, | |
517 | .readdir = cramfs_readdir, | |
518 | }; | |
519 | ||
520 | static struct inode_operations cramfs_dir_inode_operations = { | |
521 | .lookup = cramfs_lookup, | |
522 | }; | |
523 | ||
524 | static struct super_operations cramfs_ops = { | |
525 | .put_super = cramfs_put_super, | |
526 | .remount_fs = cramfs_remount, | |
527 | .statfs = cramfs_statfs, | |
528 | }; | |
529 | ||
454e2398 DH |
530 | static int cramfs_get_sb(struct file_system_type *fs_type, |
531 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 532 | { |
454e2398 DH |
533 | return get_sb_bdev(fs_type, flags, dev_name, data, cramfs_fill_super, |
534 | mnt); | |
1da177e4 LT |
535 | } |
536 | ||
537 | static struct file_system_type cramfs_fs_type = { | |
538 | .owner = THIS_MODULE, | |
539 | .name = "cramfs", | |
540 | .get_sb = cramfs_get_sb, | |
541 | .kill_sb = kill_block_super, | |
542 | .fs_flags = FS_REQUIRES_DEV, | |
543 | }; | |
544 | ||
545 | static int __init init_cramfs_fs(void) | |
546 | { | |
547 | cramfs_uncompress_init(); | |
548 | return register_filesystem(&cramfs_fs_type); | |
549 | } | |
550 | ||
551 | static void __exit exit_cramfs_fs(void) | |
552 | { | |
553 | cramfs_uncompress_exit(); | |
554 | unregister_filesystem(&cramfs_fs_type); | |
555 | } | |
556 | ||
557 | module_init(init_cramfs_fs) | |
558 | module_exit(exit_cramfs_fs) | |
559 | MODULE_LICENSE("GPL"); |