Commit | Line | Data |
---|---|---|
68252eb5 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
0aa66619 PL |
2 | /* |
3 | * Squashfs - a compressed read only filesystem for Linux | |
4 | * | |
5 | * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
d7f2ff67 | 6 | * Phillip Lougher <phillip@squashfs.org.uk> |
0aa66619 | 7 | * |
0aa66619 PL |
8 | * super.c |
9 | */ | |
10 | ||
11 | /* | |
12 | * This file implements code to read the superblock, read and initialise | |
13 | * in-memory structures at mount time, and all the VFS glue code to register | |
14 | * the filesystem. | |
15 | */ | |
16 | ||
c811f5f4 FF |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
0aa66619 | 19 | #include <linux/fs.h> |
5a2be128 | 20 | #include <linux/fs_context.h> |
0aa66619 PL |
21 | #include <linux/vfs.h> |
22 | #include <linux/slab.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
1bcbf313 | 27 | #include <linux/magic.h> |
4b5397dc | 28 | #include <linux/xattr.h> |
0aa66619 PL |
29 | |
30 | #include "squashfs_fs.h" | |
31 | #include "squashfs_fs_sb.h" | |
32 | #include "squashfs_fs_i.h" | |
33 | #include "squashfs.h" | |
4c0f0bb2 | 34 | #include "decompressor.h" |
01e5b4e4 | 35 | #include "xattr.h" |
0aa66619 PL |
36 | |
37 | static struct file_system_type squashfs_fs_type; | |
b87221de | 38 | static const struct super_operations squashfs_super_ops; |
0aa66619 | 39 | |
5a2be128 DH |
40 | static const struct squashfs_decompressor *supported_squashfs_filesystem( |
41 | struct fs_context *fc, | |
42 | short major, short minor, short id) | |
0aa66619 | 43 | { |
4c0f0bb2 PL |
44 | const struct squashfs_decompressor *decompressor; |
45 | ||
0aa66619 | 46 | if (major < SQUASHFS_MAJOR) { |
5a2be128 DH |
47 | errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d " |
48 | "filesystems are unsupported", major, minor); | |
4c0f0bb2 | 49 | return NULL; |
0aa66619 | 50 | } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { |
5a2be128 DH |
51 | errorf(fc, "Major/Minor mismatch, trying to mount newer " |
52 | "%d.%d filesystem", major, minor); | |
53 | errorf(fc, "Please update your kernel"); | |
4c0f0bb2 | 54 | return NULL; |
0aa66619 PL |
55 | } |
56 | ||
4c0f0bb2 PL |
57 | decompressor = squashfs_lookup_decompressor(id); |
58 | if (!decompressor->supported) { | |
5a2be128 DH |
59 | errorf(fc, "Filesystem uses \"%s\" compression. This is not supported", |
60 | decompressor->name); | |
4c0f0bb2 PL |
61 | return NULL; |
62 | } | |
0aa66619 | 63 | |
4c0f0bb2 | 64 | return decompressor; |
0aa66619 PL |
65 | } |
66 | ||
67 | ||
5a2be128 | 68 | static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc) |
0aa66619 PL |
69 | { |
70 | struct squashfs_sb_info *msblk; | |
71 | struct squashfs_super_block *sblk = NULL; | |
0aa66619 PL |
72 | struct inode *root; |
73 | long long root_inode; | |
74 | unsigned short flags; | |
75 | unsigned int fragments; | |
37986f63 | 76 | u64 lookup_table_start, xattr_id_table_start, next_table; |
0aa66619 PL |
77 | int err; |
78 | ||
79 | TRACE("Entered squashfs_fill_superblock\n"); | |
80 | ||
81 | sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL); | |
82 | if (sb->s_fs_info == NULL) { | |
83 | ERROR("Failed to allocate squashfs_sb_info\n"); | |
84 | return -ENOMEM; | |
85 | } | |
86 | msblk = sb->s_fs_info; | |
87 | ||
7657cacf | 88 | msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); |
0aa66619 PL |
89 | msblk->devblksize_log2 = ffz(~msblk->devblksize); |
90 | ||
0aa66619 PL |
91 | mutex_init(&msblk->meta_index_mutex); |
92 | ||
93 | /* | |
94 | * msblk->bytes_used is checked in squashfs_read_table to ensure reads | |
95 | * are not beyond filesystem end. But as we're using | |
96 | * squashfs_read_table here to read the superblock (including the value | |
97 | * of bytes_used) we need to set it to an initial sensible dummy value | |
98 | */ | |
99 | msblk->bytes_used = sizeof(*sblk); | |
82de647e | 100 | sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk)); |
0aa66619 | 101 | |
82de647e | 102 | if (IS_ERR(sblk)) { |
5a2be128 | 103 | errorf(fc, "unable to read squashfs_super_block"); |
82de647e PL |
104 | err = PTR_ERR(sblk); |
105 | sblk = NULL; | |
0aa66619 PL |
106 | goto failed_mount; |
107 | } | |
108 | ||
4c0f0bb2 PL |
109 | err = -EINVAL; |
110 | ||
0aa66619 PL |
111 | /* Check it is a SQUASHFS superblock */ |
112 | sb->s_magic = le32_to_cpu(sblk->s_magic); | |
113 | if (sb->s_magic != SQUASHFS_MAGIC) { | |
5a2be128 DH |
114 | if (!(fc->sb_flags & SB_SILENT)) |
115 | errorf(fc, "Can't find a SQUASHFS superblock on %pg", | |
116 | sb->s_bdev); | |
0aa66619 PL |
117 | goto failed_mount; |
118 | } | |
119 | ||
4c0f0bb2 PL |
120 | /* Check the MAJOR & MINOR versions and lookup compression type */ |
121 | msblk->decompressor = supported_squashfs_filesystem( | |
5a2be128 | 122 | fc, |
4c0f0bb2 | 123 | le16_to_cpu(sblk->s_major), |
0aa66619 PL |
124 | le16_to_cpu(sblk->s_minor), |
125 | le16_to_cpu(sblk->compression)); | |
4c0f0bb2 | 126 | if (msblk->decompressor == NULL) |
0aa66619 PL |
127 | goto failed_mount; |
128 | ||
0aa66619 PL |
129 | /* Check the filesystem does not extend beyond the end of the |
130 | block device */ | |
131 | msblk->bytes_used = le64_to_cpu(sblk->bytes_used); | |
132 | if (msblk->bytes_used < 0 || msblk->bytes_used > | |
133 | i_size_read(sb->s_bdev->bd_inode)) | |
134 | goto failed_mount; | |
135 | ||
136 | /* Check block size for sanity */ | |
137 | msblk->block_size = le32_to_cpu(sblk->block_size); | |
138 | if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE) | |
5a2be128 | 139 | goto insanity; |
0aa66619 | 140 | |
fffb47b8 PL |
141 | /* |
142 | * Check the system page size is not larger than the filesystem | |
143 | * block size (by default 128K). This is currently not supported. | |
144 | */ | |
09cbfeaf | 145 | if (PAGE_SIZE > msblk->block_size) { |
5a2be128 DH |
146 | errorf(fc, "Page size > filesystem block size (%d). This is " |
147 | "currently not supported!", msblk->block_size); | |
fffb47b8 PL |
148 | goto failed_mount; |
149 | } | |
150 | ||
4b0180a4 | 151 | /* Check block log for sanity */ |
0aa66619 PL |
152 | msblk->block_log = le16_to_cpu(sblk->block_log); |
153 | if (msblk->block_log > SQUASHFS_FILE_MAX_LOG) | |
154 | goto failed_mount; | |
155 | ||
4b0180a4 PL |
156 | /* Check that block_size and block_log match */ |
157 | if (msblk->block_size != (1 << msblk->block_log)) | |
5a2be128 | 158 | goto insanity; |
4b0180a4 | 159 | |
0aa66619 PL |
160 | /* Check the root inode for sanity */ |
161 | root_inode = le64_to_cpu(sblk->root_inode); | |
162 | if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE) | |
5a2be128 | 163 | goto insanity; |
0aa66619 PL |
164 | |
165 | msblk->inode_table = le64_to_cpu(sblk->inode_table_start); | |
166 | msblk->directory_table = le64_to_cpu(sblk->directory_table_start); | |
167 | msblk->inodes = le32_to_cpu(sblk->inodes); | |
71755ee5 | 168 | msblk->fragments = le32_to_cpu(sblk->fragments); |
0aa66619 PL |
169 | flags = le16_to_cpu(sblk->flags); |
170 | ||
a1c6f057 | 171 | TRACE("Found valid superblock on %pg\n", sb->s_bdev); |
0aa66619 PL |
172 | TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags) |
173 | ? "un" : ""); | |
174 | TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags) | |
175 | ? "un" : ""); | |
176 | TRACE("Filesystem size %lld bytes\n", msblk->bytes_used); | |
177 | TRACE("Block size %d\n", msblk->block_size); | |
178 | TRACE("Number of inodes %d\n", msblk->inodes); | |
71755ee5 | 179 | TRACE("Number of fragments %d\n", msblk->fragments); |
0aa66619 PL |
180 | TRACE("Number of ids %d\n", le16_to_cpu(sblk->no_ids)); |
181 | TRACE("sblk->inode_table_start %llx\n", msblk->inode_table); | |
182 | TRACE("sblk->directory_table_start %llx\n", msblk->directory_table); | |
183 | TRACE("sblk->fragment_table_start %llx\n", | |
184 | (u64) le64_to_cpu(sblk->fragment_table_start)); | |
185 | TRACE("sblk->id_table_start %llx\n", | |
186 | (u64) le64_to_cpu(sblk->id_table_start)); | |
187 | ||
188 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
22b13969 DD |
189 | sb->s_time_min = 0; |
190 | sb->s_time_max = U32_MAX; | |
1751e8a6 | 191 | sb->s_flags |= SB_RDONLY; |
0aa66619 PL |
192 | sb->s_op = &squashfs_super_ops; |
193 | ||
194 | err = -ENOMEM; | |
195 | ||
196 | msblk->block_cache = squashfs_cache_init("metadata", | |
197 | SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); | |
198 | if (msblk->block_cache == NULL) | |
199 | goto failed_mount; | |
200 | ||
201 | /* Allocate read_page block */ | |
9508c6b9 PL |
202 | msblk->read_page = squashfs_cache_init("data", |
203 | squashfs_max_decompressors(), msblk->block_size); | |
0aa66619 | 204 | if (msblk->read_page == NULL) { |
5a2be128 | 205 | errorf(fc, "Failed to allocate read_page block"); |
0aa66619 PL |
206 | goto failed_mount; |
207 | } | |
208 | ||
9508c6b9 | 209 | msblk->stream = squashfs_decompressor_setup(sb, flags); |
b7fc0ff0 PL |
210 | if (IS_ERR(msblk->stream)) { |
211 | err = PTR_ERR(msblk->stream); | |
212 | msblk->stream = NULL; | |
5a2be128 | 213 | goto insanity; |
b7fc0ff0 PL |
214 | } |
215 | ||
76e002f7 PL |
216 | /* Handle xattrs */ |
217 | sb->s_xattr = squashfs_xattr_handlers; | |
218 | xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); | |
37986f63 PL |
219 | if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { |
220 | next_table = msblk->bytes_used; | |
76e002f7 | 221 | goto allocate_id_index_table; |
37986f63 | 222 | } |
76e002f7 PL |
223 | |
224 | /* Allocate and read xattr id lookup table */ | |
225 | msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, | |
226 | xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); | |
227 | if (IS_ERR(msblk->xattr_id_table)) { | |
5a2be128 | 228 | errorf(fc, "unable to read xattr id index table"); |
76e002f7 PL |
229 | err = PTR_ERR(msblk->xattr_id_table); |
230 | msblk->xattr_id_table = NULL; | |
231 | if (err != -ENOTSUPP) | |
232 | goto failed_mount; | |
233 | } | |
37986f63 | 234 | next_table = msblk->xattr_table; |
76e002f7 PL |
235 | |
236 | allocate_id_index_table: | |
0aa66619 PL |
237 | /* Allocate and read id index table */ |
238 | msblk->id_table = squashfs_read_id_index_table(sb, | |
37986f63 PL |
239 | le64_to_cpu(sblk->id_table_start), next_table, |
240 | le16_to_cpu(sblk->no_ids)); | |
0aa66619 | 241 | if (IS_ERR(msblk->id_table)) { |
5a2be128 | 242 | errorf(fc, "unable to read id index table"); |
0aa66619 PL |
243 | err = PTR_ERR(msblk->id_table); |
244 | msblk->id_table = NULL; | |
245 | goto failed_mount; | |
246 | } | |
d5b72ce1 | 247 | next_table = le64_to_cpu(msblk->id_table[0]); |
0aa66619 | 248 | |
76e002f7 PL |
249 | /* Handle inode lookup table */ |
250 | lookup_table_start = le64_to_cpu(sblk->lookup_table_start); | |
251 | if (lookup_table_start == SQUASHFS_INVALID_BLK) | |
252 | goto handle_fragments; | |
253 | ||
254 | /* Allocate and read inode lookup table */ | |
255 | msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, | |
ac51a0a7 | 256 | lookup_table_start, next_table, msblk->inodes); |
76e002f7 | 257 | if (IS_ERR(msblk->inode_lookup_table)) { |
5a2be128 | 258 | errorf(fc, "unable to read inode lookup table"); |
76e002f7 PL |
259 | err = PTR_ERR(msblk->inode_lookup_table); |
260 | msblk->inode_lookup_table = NULL; | |
261 | goto failed_mount; | |
262 | } | |
d5b72ce1 | 263 | next_table = le64_to_cpu(msblk->inode_lookup_table[0]); |
76e002f7 PL |
264 | |
265 | sb->s_export_op = &squashfs_export_ops; | |
266 | ||
267 | handle_fragments: | |
71755ee5 | 268 | fragments = msblk->fragments; |
0aa66619 | 269 | if (fragments == 0) |
1094a4a6 | 270 | goto check_directory_table; |
0aa66619 PL |
271 | |
272 | msblk->fragment_cache = squashfs_cache_init("fragment", | |
273 | SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); | |
274 | if (msblk->fragment_cache == NULL) { | |
275 | err = -ENOMEM; | |
276 | goto failed_mount; | |
277 | } | |
278 | ||
279 | /* Allocate and read fragment index table */ | |
280 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, | |
1cac63cc | 281 | le64_to_cpu(sblk->fragment_table_start), next_table, fragments); |
0aa66619 | 282 | if (IS_ERR(msblk->fragment_index)) { |
5a2be128 | 283 | errorf(fc, "unable to read fragment index table"); |
0aa66619 PL |
284 | err = PTR_ERR(msblk->fragment_index); |
285 | msblk->fragment_index = NULL; | |
286 | goto failed_mount; | |
287 | } | |
d5b72ce1 | 288 | next_table = le64_to_cpu(msblk->fragment_index[0]); |
0aa66619 | 289 | |
1094a4a6 PL |
290 | check_directory_table: |
291 | /* Sanity check directory_table */ | |
cc37f75a | 292 | if (msblk->directory_table > next_table) { |
1094a4a6 | 293 | err = -EINVAL; |
5a2be128 | 294 | goto insanity; |
1094a4a6 PL |
295 | } |
296 | ||
297 | /* Sanity check inode_table */ | |
298 | if (msblk->inode_table >= msblk->directory_table) { | |
299 | err = -EINVAL; | |
5a2be128 | 300 | goto insanity; |
1094a4a6 PL |
301 | } |
302 | ||
303 | /* allocate root */ | |
0aa66619 PL |
304 | root = new_inode(sb); |
305 | if (!root) { | |
306 | err = -ENOMEM; | |
307 | goto failed_mount; | |
308 | } | |
309 | ||
310 | err = squashfs_read_inode(root, root_inode); | |
311 | if (err) { | |
1cb08e97 PL |
312 | make_bad_inode(root); |
313 | iput(root); | |
0aa66619 PL |
314 | goto failed_mount; |
315 | } | |
316 | insert_inode_hash(root); | |
317 | ||
48fde701 | 318 | sb->s_root = d_make_root(root); |
0aa66619 PL |
319 | if (sb->s_root == NULL) { |
320 | ERROR("Root inode create failed\n"); | |
321 | err = -ENOMEM; | |
0aa66619 PL |
322 | goto failed_mount; |
323 | } | |
324 | ||
325 | TRACE("Leaving squashfs_fill_super\n"); | |
326 | kfree(sblk); | |
327 | return 0; | |
328 | ||
5a2be128 DH |
329 | insanity: |
330 | errorf(fc, "squashfs image failed sanity check"); | |
0aa66619 PL |
331 | failed_mount: |
332 | squashfs_cache_delete(msblk->block_cache); | |
333 | squashfs_cache_delete(msblk->fragment_cache); | |
334 | squashfs_cache_delete(msblk->read_page); | |
9508c6b9 | 335 | squashfs_decompressor_destroy(msblk); |
0aa66619 PL |
336 | kfree(msblk->inode_lookup_table); |
337 | kfree(msblk->fragment_index); | |
338 | kfree(msblk->id_table); | |
4b5397dc | 339 | kfree(msblk->xattr_id_table); |
0aa66619 PL |
340 | kfree(sb->s_fs_info); |
341 | sb->s_fs_info = NULL; | |
342 | kfree(sblk); | |
343 | return err; | |
0aa66619 PL |
344 | } |
345 | ||
5a2be128 DH |
346 | static int squashfs_get_tree(struct fs_context *fc) |
347 | { | |
348 | return get_tree_bdev(fc, squashfs_fill_super); | |
349 | } | |
350 | ||
351 | static int squashfs_reconfigure(struct fs_context *fc) | |
352 | { | |
353 | sync_filesystem(fc->root->d_sb); | |
354 | fc->sb_flags |= SB_RDONLY; | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static const struct fs_context_operations squashfs_context_ops = { | |
359 | .get_tree = squashfs_get_tree, | |
360 | .reconfigure = squashfs_reconfigure, | |
361 | }; | |
362 | ||
363 | static int squashfs_init_fs_context(struct fs_context *fc) | |
364 | { | |
365 | fc->ops = &squashfs_context_ops; | |
366 | return 0; | |
367 | } | |
0aa66619 PL |
368 | |
369 | static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
370 | { | |
371 | struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | |
2fc7f562 | 372 | u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); |
0aa66619 PL |
373 | |
374 | TRACE("Entered squashfs_statfs\n"); | |
375 | ||
376 | buf->f_type = SQUASHFS_MAGIC; | |
377 | buf->f_bsize = msblk->block_size; | |
378 | buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; | |
379 | buf->f_bfree = buf->f_bavail = 0; | |
380 | buf->f_files = msblk->inodes; | |
381 | buf->f_ffree = 0; | |
382 | buf->f_namelen = SQUASHFS_NAME_LEN; | |
2fc7f562 CL |
383 | buf->f_fsid.val[0] = (u32)id; |
384 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
0aa66619 PL |
385 | |
386 | return 0; | |
387 | } | |
388 | ||
389 | ||
0aa66619 PL |
390 | static void squashfs_put_super(struct super_block *sb) |
391 | { | |
392 | if (sb->s_fs_info) { | |
393 | struct squashfs_sb_info *sbi = sb->s_fs_info; | |
394 | squashfs_cache_delete(sbi->block_cache); | |
395 | squashfs_cache_delete(sbi->fragment_cache); | |
396 | squashfs_cache_delete(sbi->read_page); | |
9508c6b9 | 397 | squashfs_decompressor_destroy(sbi); |
0aa66619 PL |
398 | kfree(sbi->id_table); |
399 | kfree(sbi->fragment_index); | |
400 | kfree(sbi->meta_index); | |
370ec3d1 | 401 | kfree(sbi->inode_lookup_table); |
4b5397dc | 402 | kfree(sbi->xattr_id_table); |
0aa66619 PL |
403 | kfree(sb->s_fs_info); |
404 | sb->s_fs_info = NULL; | |
405 | } | |
406 | } | |
407 | ||
0aa66619 PL |
408 | static struct kmem_cache *squashfs_inode_cachep; |
409 | ||
410 | ||
411 | static void init_once(void *foo) | |
412 | { | |
413 | struct squashfs_inode_info *ei = foo; | |
414 | ||
415 | inode_init_once(&ei->vfs_inode); | |
416 | } | |
417 | ||
418 | ||
419 | static int __init init_inodecache(void) | |
420 | { | |
421 | squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | |
422 | sizeof(struct squashfs_inode_info), 0, | |
5d097056 VD |
423 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
424 | init_once); | |
0aa66619 PL |
425 | |
426 | return squashfs_inode_cachep ? 0 : -ENOMEM; | |
427 | } | |
428 | ||
429 | ||
430 | static void destroy_inodecache(void) | |
431 | { | |
8c0a8537 KS |
432 | /* |
433 | * Make sure all delayed rcu free inodes are flushed before we | |
434 | * destroy cache. | |
435 | */ | |
436 | rcu_barrier(); | |
0aa66619 PL |
437 | kmem_cache_destroy(squashfs_inode_cachep); |
438 | } | |
439 | ||
440 | ||
441 | static int __init init_squashfs_fs(void) | |
442 | { | |
443 | int err = init_inodecache(); | |
444 | ||
445 | if (err) | |
446 | return err; | |
447 | ||
448 | err = register_filesystem(&squashfs_fs_type); | |
449 | if (err) { | |
450 | destroy_inodecache(); | |
451 | return err; | |
452 | } | |
453 | ||
c811f5f4 | 454 | pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); |
0aa66619 PL |
455 | |
456 | return 0; | |
457 | } | |
458 | ||
459 | ||
460 | static void __exit exit_squashfs_fs(void) | |
461 | { | |
462 | unregister_filesystem(&squashfs_fs_type); | |
463 | destroy_inodecache(); | |
464 | } | |
465 | ||
466 | ||
467 | static struct inode *squashfs_alloc_inode(struct super_block *sb) | |
468 | { | |
469 | struct squashfs_inode_info *ei = | |
470 | kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL); | |
471 | ||
472 | return ei ? &ei->vfs_inode : NULL; | |
473 | } | |
474 | ||
475 | ||
56b5af19 | 476 | static void squashfs_free_inode(struct inode *inode) |
0aa66619 PL |
477 | { |
478 | kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); | |
479 | } | |
480 | ||
0aa66619 PL |
481 | static struct file_system_type squashfs_fs_type = { |
482 | .owner = THIS_MODULE, | |
483 | .name = "squashfs", | |
5a2be128 | 484 | .init_fs_context = squashfs_init_fs_context, |
0aa66619 PL |
485 | .kill_sb = kill_block_super, |
486 | .fs_flags = FS_REQUIRES_DEV | |
487 | }; | |
3e64fe5b | 488 | MODULE_ALIAS_FS("squashfs"); |
0aa66619 | 489 | |
b87221de | 490 | static const struct super_operations squashfs_super_ops = { |
0aa66619 | 491 | .alloc_inode = squashfs_alloc_inode, |
56b5af19 | 492 | .free_inode = squashfs_free_inode, |
0aa66619 PL |
493 | .statfs = squashfs_statfs, |
494 | .put_super = squashfs_put_super, | |
0aa66619 PL |
495 | }; |
496 | ||
497 | module_init(init_squashfs_fs); | |
498 | module_exit(exit_squashfs_fs); | |
499 | MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); | |
d7f2ff67 | 500 | MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>"); |
0aa66619 | 501 | MODULE_LICENSE("GPL"); |