blob: 3d194a2be3f511e869a541d9b782d6cbe5dddaec [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080025#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <asm/semaphore.h>
27
28#include <asm/uaccess.h>
29
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080030static const struct super_operations cramfs_ops;
Arjan van de Ven754661f2007-02-12 00:55:38 -080031static const struct inode_operations cramfs_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080032static const struct file_operations cramfs_directory_operations;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070033static const struct address_space_operations cramfs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Ingo Molnar353ab6e2006-03-26 01:37:12 -080035static DEFINE_MUTEX(read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37
38/* These two macros may change in future, to provide better st_ino
39 semantics. */
Dave Johnsonff3aea02006-03-06 15:42:36 -080040#define CRAMINO(x) (((x)->offset && (x)->size)?(x)->offset<<2:1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define OFFSET(x) ((x)->i_ino)
42
Dave Johnsona97c9bf2005-09-06 15:17:40 -070043
44static int cramfs_iget5_test(struct inode *inode, void *opaque)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
Dave Johnsona97c9bf2005-09-06 15:17:40 -070046 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
68static int cramfs_iget5_set(struct inode *inode, void *opaque)
69{
Dave Johnsonff3aea02006-03-06 15:42:36 -080070 static struct timespec zerotime;
Dave Johnsona97c9bf2005-09-06 15:17:40 -070071 struct cramfs_inode *cramfs_inode = opaque;
Dave Johnsonff3aea02006-03-06 15:42:36 -080072 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;
Dave Johnsonff3aea02006-03-06 15:42:36 -080076 inode->i_gid = cramfs_inode->gid;
77 /* Struct copy intentional */
78 inode->i_mtime = inode->i_atime = inode->i_ctime = zerotime;
Dave Johnsona97c9bf2005-09-06 15:17:40 -070079 inode->i_ino = CRAMINO(cramfs_inode);
Dave Johnsonff3aea02006-03-06 15:42:36 -080080 /* inode->i_nlink is left 1 - arguably wrong for directories,
81 but it's the best we can do without reading the directory
82 contents. 1 yields the right result in GNU find, even
83 without -noleaf option. */
84 if (S_ISREG(inode->i_mode)) {
85 inode->i_fop = &generic_ro_fops;
86 inode->i_data.a_ops = &cramfs_aops;
87 } else if (S_ISDIR(inode->i_mode)) {
88 inode->i_op = &cramfs_dir_inode_operations;
89 inode->i_fop = &cramfs_directory_operations;
90 } else if (S_ISLNK(inode->i_mode)) {
91 inode->i_op = &page_symlink_inode_operations;
92 inode->i_data.a_ops = &cramfs_aops;
93 } else {
94 inode->i_size = 0;
95 inode->i_blocks = 0;
96 init_special_inode(inode, inode->i_mode,
97 old_decode_dev(cramfs_inode->size));
98 }
Dave Johnsona97c9bf2005-09-06 15:17:40 -070099 return 0;
100}
101
102static struct inode *get_cramfs_inode(struct super_block *sb,
103 struct cramfs_inode * cramfs_inode)
104{
105 struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),
106 cramfs_iget5_test, cramfs_iget5_set,
107 cramfs_inode);
Dave Johnsona97c9bf2005-09-06 15:17:40 -0700108 if (inode && (inode->i_state & I_NEW)) {
Dave Johnsona97c9bf2005-09-06 15:17:40 -0700109 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111 return inode;
112}
113
114/*
115 * We have our own block cache: don't fill up the buffer cache
116 * with the rom-image, because the way the filesystem is set
117 * up the accesses should be fairly regular and cached in the
118 * page cache and dentry tree anyway..
119 *
120 * This also acts as a way to guarantee contiguous areas of up to
121 * BLKS_PER_BUF*PAGE_CACHE_SIZE, so that the caller doesn't need to
122 * worry about end-of-buffer issues even when decompressing a full
123 * page cache.
124 */
125#define READ_BUFFERS (2)
126/* NEXT_BUFFER(): Loop over [0..(READ_BUFFERS-1)]. */
127#define NEXT_BUFFER(_ix) ((_ix) ^ 1)
128
129/*
130 * BLKS_PER_BUF_SHIFT should be at least 2 to allow for "compressed"
131 * data that takes up more space than the original and with unlucky
132 * alignment.
133 */
134#define BLKS_PER_BUF_SHIFT (2)
135#define BLKS_PER_BUF (1 << BLKS_PER_BUF_SHIFT)
136#define BUFFER_SIZE (BLKS_PER_BUF*PAGE_CACHE_SIZE)
137
138static unsigned char read_buffers[READ_BUFFERS][BUFFER_SIZE];
139static unsigned buffer_blocknr[READ_BUFFERS];
140static struct super_block * buffer_dev[READ_BUFFERS];
141static int next_buffer;
142
143/*
144 * Returns a pointer to a buffer containing at least LEN bytes of
145 * filesystem starting at byte offset OFFSET into the filesystem.
146 */
147static void *cramfs_read(struct super_block *sb, unsigned int offset, unsigned int len)
148{
149 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
150 struct page *pages[BLKS_PER_BUF];
151 unsigned i, blocknr, buffer, unread;
152 unsigned long devsize;
153 char *data;
154
155 if (!len)
156 return NULL;
157 blocknr = offset >> PAGE_CACHE_SHIFT;
158 offset &= PAGE_CACHE_SIZE - 1;
159
160 /* Check if an existing buffer already has the data.. */
161 for (i = 0; i < READ_BUFFERS; i++) {
162 unsigned int blk_offset;
163
164 if (buffer_dev[i] != sb)
165 continue;
166 if (blocknr < buffer_blocknr[i])
167 continue;
168 blk_offset = (blocknr - buffer_blocknr[i]) << PAGE_CACHE_SHIFT;
169 blk_offset += offset;
170 if (blk_offset + len > BUFFER_SIZE)
171 continue;
172 return read_buffers[i] + blk_offset;
173 }
174
175 devsize = mapping->host->i_size >> PAGE_CACHE_SHIFT;
176
177 /* Ok, read in BLKS_PER_BUF pages completely first. */
178 unread = 0;
179 for (i = 0; i < BLKS_PER_BUF; i++) {
180 struct page *page = NULL;
181
182 if (blocknr + i < devsize) {
Nick Piggin6fe69002007-05-06 14:49:04 -0700183 page = read_mapping_page_async(mapping, blocknr + i,
184 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 /* 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
223static void cramfs_put_super(struct super_block *sb)
224{
225 kfree(sb->s_fs_info);
226 sb->s_fs_info = NULL;
227}
228
229static int cramfs_remount(struct super_block *sb, int *flags, char *data)
230{
231 *flags |= MS_RDONLY;
232 return 0;
233}
234
235static 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
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700245 sbi = kzalloc(sizeof(struct cramfs_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (!sbi)
247 return -ENOMEM;
248 sb->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250 /* Invalidate the read buffers on mount: think disk change.. */
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800251 mutex_lock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 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));
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800257 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259 /* Do sanity checks on the superblock */
260 if (super.magic != CRAMFS_MAGIC) {
261 /* check at 512 byte offset */
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800262 mutex_lock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800264 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 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;
316out:
317 kfree(sbi);
318 sb->s_fs_info = NULL;
319 return -EINVAL;
320}
321
David Howells726c3342006-06-23 02:02:58 -0700322static int cramfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
David Howells726c3342006-06-23 02:02:58 -0700324 struct super_block *sb = dentry->d_sb;
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 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 */
340static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
341{
Josef Sipek352d8af2006-12-08 02:36:58 -0800342 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 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
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800369 mutex_lock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 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;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800382 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 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 */
408static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
409{
410 unsigned int offset = 0;
411 int sorted;
412
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800413 mutex_lock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 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) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800436 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 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;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800450 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 d_add(dentry, get_cramfs_inode(dir->i_sb, &entry));
452 return NULL;
453 }
454 /* else (retval < 0) */
455 if (sorted)
456 break;
457 }
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800458 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 d_add(dentry, NULL);
460 return NULL;
461}
462
463static 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;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800477 mutex_lock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 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);
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800481 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 pgdata = kmap(page);
483 if (compr_len == 0)
484 ; /* hole */
Phillip Lougher8bb02692006-12-06 20:37:20 -0800485 else if (compr_len > (PAGE_CACHE_SIZE << 1))
486 printk(KERN_ERR "cramfs: bad compressed blocksize %u\n", compr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 else {
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800488 mutex_lock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 bytes_filled = cramfs_uncompress_block(pgdata,
490 PAGE_CACHE_SIZE,
491 cramfs_read(sb, start_offset, compr_len),
492 compr_len);
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800493 mutex_unlock(&read_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
495 } else
496 pgdata = kmap(page);
497 memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
498 kunmap(page);
499 flush_dcache_page(page);
500 SetPageUptodate(page);
501 unlock_page(page);
502 return 0;
503}
504
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700505static const struct address_space_operations cramfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 .readpage = cramfs_readpage
507};
508
509/*
510 * Our operations:
511 */
512
513/*
514 * A directory can only readdir
515 */
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800516static const struct file_operations cramfs_directory_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 .llseek = generic_file_llseek,
518 .read = generic_read_dir,
519 .readdir = cramfs_readdir,
520};
521
Arjan van de Ven754661f2007-02-12 00:55:38 -0800522static const struct inode_operations cramfs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 .lookup = cramfs_lookup,
524};
525
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800526static const struct super_operations cramfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 .put_super = cramfs_put_super,
528 .remount_fs = cramfs_remount,
529 .statfs = cramfs_statfs,
530};
531
David Howells454e2392006-06-23 02:02:57 -0700532static int cramfs_get_sb(struct file_system_type *fs_type,
533 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534{
David Howells454e2392006-06-23 02:02:57 -0700535 return get_sb_bdev(fs_type, flags, dev_name, data, cramfs_fill_super,
536 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537}
538
539static struct file_system_type cramfs_fs_type = {
540 .owner = THIS_MODULE,
541 .name = "cramfs",
542 .get_sb = cramfs_get_sb,
543 .kill_sb = kill_block_super,
544 .fs_flags = FS_REQUIRES_DEV,
545};
546
547static int __init init_cramfs_fs(void)
548{
Alexey Dobriyan50d44ed2006-09-29 02:01:04 -0700549 int rv;
550
551 rv = cramfs_uncompress_init();
552 if (rv < 0)
553 return rv;
554 rv = register_filesystem(&cramfs_fs_type);
555 if (rv < 0)
556 cramfs_uncompress_exit();
557 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559
560static void __exit exit_cramfs_fs(void)
561{
562 cramfs_uncompress_exit();
563 unregister_filesystem(&cramfs_fs_type);
564}
565
566module_init(init_cramfs_fs)
567module_exit(exit_cramfs_fs)
568MODULE_LICENSE("GPL");