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Commit | Line | Data |
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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> |
10dde05b | 21 | #include <linux/fs_parser.h> |
0aa66619 PL |
22 | #include <linux/vfs.h> |
23 | #include <linux/slab.h> | |
24 | #include <linux/mutex.h> | |
10dde05b | 25 | #include <linux/seq_file.h> |
0aa66619 PL |
26 | #include <linux/pagemap.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/module.h> | |
1bcbf313 | 29 | #include <linux/magic.h> |
4b5397dc | 30 | #include <linux/xattr.h> |
0aa66619 PL |
31 | |
32 | #include "squashfs_fs.h" | |
33 | #include "squashfs_fs_sb.h" | |
34 | #include "squashfs_fs_i.h" | |
35 | #include "squashfs.h" | |
4c0f0bb2 | 36 | #include "decompressor.h" |
01e5b4e4 | 37 | #include "xattr.h" |
0aa66619 PL |
38 | |
39 | static struct file_system_type squashfs_fs_type; | |
b87221de | 40 | static const struct super_operations squashfs_super_ops; |
0aa66619 | 41 | |
10dde05b VW |
42 | enum Opt_errors { |
43 | Opt_errors_continue, | |
44 | Opt_errors_panic, | |
45 | }; | |
46 | ||
47 | enum squashfs_param { | |
48 | Opt_errors, | |
49 | }; | |
50 | ||
51 | struct squashfs_mount_opts { | |
52 | enum Opt_errors errors; | |
53 | }; | |
54 | ||
55 | static const struct constant_table squashfs_param_errors[] = { | |
56 | {"continue", Opt_errors_continue }, | |
57 | {"panic", Opt_errors_panic }, | |
58 | {} | |
59 | }; | |
60 | ||
61 | static const struct fs_parameter_spec squashfs_fs_parameters[] = { | |
62 | fsparam_enum("errors", Opt_errors, squashfs_param_errors), | |
63 | {} | |
64 | }; | |
65 | ||
66 | static int squashfs_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
67 | { | |
68 | struct squashfs_mount_opts *opts = fc->fs_private; | |
69 | struct fs_parse_result result; | |
70 | int opt; | |
71 | ||
72 | opt = fs_parse(fc, squashfs_fs_parameters, param, &result); | |
73 | if (opt < 0) | |
74 | return opt; | |
75 | ||
76 | switch (opt) { | |
77 | case Opt_errors: | |
78 | opts->errors = result.uint_32; | |
79 | break; | |
80 | default: | |
81 | return -EINVAL; | |
82 | } | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
5a2be128 DH |
87 | static const struct squashfs_decompressor *supported_squashfs_filesystem( |
88 | struct fs_context *fc, | |
89 | short major, short minor, short id) | |
0aa66619 | 90 | { |
4c0f0bb2 PL |
91 | const struct squashfs_decompressor *decompressor; |
92 | ||
0aa66619 | 93 | if (major < SQUASHFS_MAJOR) { |
5a2be128 DH |
94 | errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d " |
95 | "filesystems are unsupported", major, minor); | |
4c0f0bb2 | 96 | return NULL; |
0aa66619 | 97 | } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { |
5a2be128 DH |
98 | errorf(fc, "Major/Minor mismatch, trying to mount newer " |
99 | "%d.%d filesystem", major, minor); | |
100 | errorf(fc, "Please update your kernel"); | |
4c0f0bb2 | 101 | return NULL; |
0aa66619 PL |
102 | } |
103 | ||
4c0f0bb2 PL |
104 | decompressor = squashfs_lookup_decompressor(id); |
105 | if (!decompressor->supported) { | |
5a2be128 DH |
106 | errorf(fc, "Filesystem uses \"%s\" compression. This is not supported", |
107 | decompressor->name); | |
4c0f0bb2 PL |
108 | return NULL; |
109 | } | |
0aa66619 | 110 | |
4c0f0bb2 | 111 | return decompressor; |
0aa66619 PL |
112 | } |
113 | ||
114 | ||
5a2be128 | 115 | static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc) |
0aa66619 | 116 | { |
10dde05b | 117 | struct squashfs_mount_opts *opts = fc->fs_private; |
0aa66619 PL |
118 | struct squashfs_sb_info *msblk; |
119 | struct squashfs_super_block *sblk = NULL; | |
0aa66619 PL |
120 | struct inode *root; |
121 | long long root_inode; | |
122 | unsigned short flags; | |
123 | unsigned int fragments; | |
37986f63 | 124 | u64 lookup_table_start, xattr_id_table_start, next_table; |
0aa66619 PL |
125 | int err; |
126 | ||
127 | TRACE("Entered squashfs_fill_superblock\n"); | |
128 | ||
129 | sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL); | |
130 | if (sb->s_fs_info == NULL) { | |
131 | ERROR("Failed to allocate squashfs_sb_info\n"); | |
132 | return -ENOMEM; | |
133 | } | |
134 | msblk = sb->s_fs_info; | |
135 | ||
10dde05b VW |
136 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); |
137 | ||
7657cacf | 138 | msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); |
0aa66619 PL |
139 | msblk->devblksize_log2 = ffz(~msblk->devblksize); |
140 | ||
0aa66619 PL |
141 | mutex_init(&msblk->meta_index_mutex); |
142 | ||
143 | /* | |
144 | * msblk->bytes_used is checked in squashfs_read_table to ensure reads | |
145 | * are not beyond filesystem end. But as we're using | |
146 | * squashfs_read_table here to read the superblock (including the value | |
147 | * of bytes_used) we need to set it to an initial sensible dummy value | |
148 | */ | |
149 | msblk->bytes_used = sizeof(*sblk); | |
82de647e | 150 | sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk)); |
0aa66619 | 151 | |
82de647e | 152 | if (IS_ERR(sblk)) { |
5a2be128 | 153 | errorf(fc, "unable to read squashfs_super_block"); |
82de647e PL |
154 | err = PTR_ERR(sblk); |
155 | sblk = NULL; | |
0aa66619 PL |
156 | goto failed_mount; |
157 | } | |
158 | ||
4c0f0bb2 PL |
159 | err = -EINVAL; |
160 | ||
0aa66619 PL |
161 | /* Check it is a SQUASHFS superblock */ |
162 | sb->s_magic = le32_to_cpu(sblk->s_magic); | |
163 | if (sb->s_magic != SQUASHFS_MAGIC) { | |
5a2be128 DH |
164 | if (!(fc->sb_flags & SB_SILENT)) |
165 | errorf(fc, "Can't find a SQUASHFS superblock on %pg", | |
166 | sb->s_bdev); | |
0aa66619 PL |
167 | goto failed_mount; |
168 | } | |
169 | ||
4c0f0bb2 PL |
170 | /* Check the MAJOR & MINOR versions and lookup compression type */ |
171 | msblk->decompressor = supported_squashfs_filesystem( | |
5a2be128 | 172 | fc, |
4c0f0bb2 | 173 | le16_to_cpu(sblk->s_major), |
0aa66619 PL |
174 | le16_to_cpu(sblk->s_minor), |
175 | le16_to_cpu(sblk->compression)); | |
4c0f0bb2 | 176 | if (msblk->decompressor == NULL) |
0aa66619 PL |
177 | goto failed_mount; |
178 | ||
0aa66619 PL |
179 | /* Check the filesystem does not extend beyond the end of the |
180 | block device */ | |
181 | msblk->bytes_used = le64_to_cpu(sblk->bytes_used); | |
182 | if (msblk->bytes_used < 0 || msblk->bytes_used > | |
183 | i_size_read(sb->s_bdev->bd_inode)) | |
184 | goto failed_mount; | |
185 | ||
186 | /* Check block size for sanity */ | |
187 | msblk->block_size = le32_to_cpu(sblk->block_size); | |
188 | if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE) | |
5a2be128 | 189 | goto insanity; |
0aa66619 | 190 | |
fffb47b8 PL |
191 | /* |
192 | * Check the system page size is not larger than the filesystem | |
193 | * block size (by default 128K). This is currently not supported. | |
194 | */ | |
09cbfeaf | 195 | if (PAGE_SIZE > msblk->block_size) { |
5a2be128 DH |
196 | errorf(fc, "Page size > filesystem block size (%d). This is " |
197 | "currently not supported!", msblk->block_size); | |
fffb47b8 PL |
198 | goto failed_mount; |
199 | } | |
200 | ||
4b0180a4 | 201 | /* Check block log for sanity */ |
0aa66619 PL |
202 | msblk->block_log = le16_to_cpu(sblk->block_log); |
203 | if (msblk->block_log > SQUASHFS_FILE_MAX_LOG) | |
204 | goto failed_mount; | |
205 | ||
4b0180a4 PL |
206 | /* Check that block_size and block_log match */ |
207 | if (msblk->block_size != (1 << msblk->block_log)) | |
5a2be128 | 208 | goto insanity; |
4b0180a4 | 209 | |
0aa66619 PL |
210 | /* Check the root inode for sanity */ |
211 | root_inode = le64_to_cpu(sblk->root_inode); | |
212 | if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE) | |
5a2be128 | 213 | goto insanity; |
0aa66619 PL |
214 | |
215 | msblk->inode_table = le64_to_cpu(sblk->inode_table_start); | |
216 | msblk->directory_table = le64_to_cpu(sblk->directory_table_start); | |
217 | msblk->inodes = le32_to_cpu(sblk->inodes); | |
71755ee5 | 218 | msblk->fragments = le32_to_cpu(sblk->fragments); |
f37aa4c7 | 219 | msblk->ids = le16_to_cpu(sblk->no_ids); |
0aa66619 PL |
220 | flags = le16_to_cpu(sblk->flags); |
221 | ||
a1c6f057 | 222 | TRACE("Found valid superblock on %pg\n", sb->s_bdev); |
0aa66619 PL |
223 | TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags) |
224 | ? "un" : ""); | |
225 | TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags) | |
226 | ? "un" : ""); | |
227 | TRACE("Filesystem size %lld bytes\n", msblk->bytes_used); | |
228 | TRACE("Block size %d\n", msblk->block_size); | |
229 | TRACE("Number of inodes %d\n", msblk->inodes); | |
71755ee5 | 230 | TRACE("Number of fragments %d\n", msblk->fragments); |
f37aa4c7 | 231 | TRACE("Number of ids %d\n", msblk->ids); |
0aa66619 PL |
232 | TRACE("sblk->inode_table_start %llx\n", msblk->inode_table); |
233 | TRACE("sblk->directory_table_start %llx\n", msblk->directory_table); | |
234 | TRACE("sblk->fragment_table_start %llx\n", | |
235 | (u64) le64_to_cpu(sblk->fragment_table_start)); | |
236 | TRACE("sblk->id_table_start %llx\n", | |
237 | (u64) le64_to_cpu(sblk->id_table_start)); | |
238 | ||
239 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
22b13969 DD |
240 | sb->s_time_min = 0; |
241 | sb->s_time_max = U32_MAX; | |
1751e8a6 | 242 | sb->s_flags |= SB_RDONLY; |
0aa66619 PL |
243 | sb->s_op = &squashfs_super_ops; |
244 | ||
245 | err = -ENOMEM; | |
246 | ||
247 | msblk->block_cache = squashfs_cache_init("metadata", | |
248 | SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); | |
249 | if (msblk->block_cache == NULL) | |
250 | goto failed_mount; | |
251 | ||
252 | /* Allocate read_page block */ | |
9508c6b9 PL |
253 | msblk->read_page = squashfs_cache_init("data", |
254 | squashfs_max_decompressors(), msblk->block_size); | |
0aa66619 | 255 | if (msblk->read_page == NULL) { |
5a2be128 | 256 | errorf(fc, "Failed to allocate read_page block"); |
0aa66619 PL |
257 | goto failed_mount; |
258 | } | |
259 | ||
9508c6b9 | 260 | msblk->stream = squashfs_decompressor_setup(sb, flags); |
b7fc0ff0 PL |
261 | if (IS_ERR(msblk->stream)) { |
262 | err = PTR_ERR(msblk->stream); | |
263 | msblk->stream = NULL; | |
5a2be128 | 264 | goto insanity; |
b7fc0ff0 PL |
265 | } |
266 | ||
76e002f7 PL |
267 | /* Handle xattrs */ |
268 | sb->s_xattr = squashfs_xattr_handlers; | |
269 | xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); | |
37986f63 PL |
270 | if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { |
271 | next_table = msblk->bytes_used; | |
76e002f7 | 272 | goto allocate_id_index_table; |
37986f63 | 273 | } |
76e002f7 PL |
274 | |
275 | /* Allocate and read xattr id lookup table */ | |
276 | msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, | |
277 | xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); | |
278 | if (IS_ERR(msblk->xattr_id_table)) { | |
5a2be128 | 279 | errorf(fc, "unable to read xattr id index table"); |
76e002f7 PL |
280 | err = PTR_ERR(msblk->xattr_id_table); |
281 | msblk->xattr_id_table = NULL; | |
282 | if (err != -ENOTSUPP) | |
283 | goto failed_mount; | |
284 | } | |
37986f63 | 285 | next_table = msblk->xattr_table; |
76e002f7 PL |
286 | |
287 | allocate_id_index_table: | |
0aa66619 PL |
288 | /* Allocate and read id index table */ |
289 | msblk->id_table = squashfs_read_id_index_table(sb, | |
f37aa4c7 | 290 | le64_to_cpu(sblk->id_table_start), next_table, msblk->ids); |
0aa66619 | 291 | if (IS_ERR(msblk->id_table)) { |
5a2be128 | 292 | errorf(fc, "unable to read id index table"); |
0aa66619 PL |
293 | err = PTR_ERR(msblk->id_table); |
294 | msblk->id_table = NULL; | |
295 | goto failed_mount; | |
296 | } | |
d5b72ce1 | 297 | next_table = le64_to_cpu(msblk->id_table[0]); |
0aa66619 | 298 | |
76e002f7 PL |
299 | /* Handle inode lookup table */ |
300 | lookup_table_start = le64_to_cpu(sblk->lookup_table_start); | |
301 | if (lookup_table_start == SQUASHFS_INVALID_BLK) | |
302 | goto handle_fragments; | |
303 | ||
304 | /* Allocate and read inode lookup table */ | |
305 | msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, | |
ac51a0a7 | 306 | lookup_table_start, next_table, msblk->inodes); |
76e002f7 | 307 | if (IS_ERR(msblk->inode_lookup_table)) { |
5a2be128 | 308 | errorf(fc, "unable to read inode lookup table"); |
76e002f7 PL |
309 | err = PTR_ERR(msblk->inode_lookup_table); |
310 | msblk->inode_lookup_table = NULL; | |
311 | goto failed_mount; | |
312 | } | |
d5b72ce1 | 313 | next_table = le64_to_cpu(msblk->inode_lookup_table[0]); |
76e002f7 PL |
314 | |
315 | sb->s_export_op = &squashfs_export_ops; | |
316 | ||
317 | handle_fragments: | |
71755ee5 | 318 | fragments = msblk->fragments; |
0aa66619 | 319 | if (fragments == 0) |
1094a4a6 | 320 | goto check_directory_table; |
0aa66619 PL |
321 | |
322 | msblk->fragment_cache = squashfs_cache_init("fragment", | |
323 | SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); | |
324 | if (msblk->fragment_cache == NULL) { | |
325 | err = -ENOMEM; | |
326 | goto failed_mount; | |
327 | } | |
328 | ||
329 | /* Allocate and read fragment index table */ | |
330 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, | |
1cac63cc | 331 | le64_to_cpu(sblk->fragment_table_start), next_table, fragments); |
0aa66619 | 332 | if (IS_ERR(msblk->fragment_index)) { |
5a2be128 | 333 | errorf(fc, "unable to read fragment index table"); |
0aa66619 PL |
334 | err = PTR_ERR(msblk->fragment_index); |
335 | msblk->fragment_index = NULL; | |
336 | goto failed_mount; | |
337 | } | |
d5b72ce1 | 338 | next_table = le64_to_cpu(msblk->fragment_index[0]); |
0aa66619 | 339 | |
1094a4a6 PL |
340 | check_directory_table: |
341 | /* Sanity check directory_table */ | |
cc37f75a | 342 | if (msblk->directory_table > next_table) { |
1094a4a6 | 343 | err = -EINVAL; |
5a2be128 | 344 | goto insanity; |
1094a4a6 PL |
345 | } |
346 | ||
347 | /* Sanity check inode_table */ | |
348 | if (msblk->inode_table >= msblk->directory_table) { | |
349 | err = -EINVAL; | |
5a2be128 | 350 | goto insanity; |
1094a4a6 PL |
351 | } |
352 | ||
353 | /* allocate root */ | |
0aa66619 PL |
354 | root = new_inode(sb); |
355 | if (!root) { | |
356 | err = -ENOMEM; | |
357 | goto failed_mount; | |
358 | } | |
359 | ||
360 | err = squashfs_read_inode(root, root_inode); | |
361 | if (err) { | |
1cb08e97 PL |
362 | make_bad_inode(root); |
363 | iput(root); | |
0aa66619 PL |
364 | goto failed_mount; |
365 | } | |
366 | insert_inode_hash(root); | |
367 | ||
48fde701 | 368 | sb->s_root = d_make_root(root); |
0aa66619 PL |
369 | if (sb->s_root == NULL) { |
370 | ERROR("Root inode create failed\n"); | |
371 | err = -ENOMEM; | |
0aa66619 PL |
372 | goto failed_mount; |
373 | } | |
374 | ||
375 | TRACE("Leaving squashfs_fill_super\n"); | |
376 | kfree(sblk); | |
377 | return 0; | |
378 | ||
5a2be128 DH |
379 | insanity: |
380 | errorf(fc, "squashfs image failed sanity check"); | |
0aa66619 PL |
381 | failed_mount: |
382 | squashfs_cache_delete(msblk->block_cache); | |
383 | squashfs_cache_delete(msblk->fragment_cache); | |
384 | squashfs_cache_delete(msblk->read_page); | |
9508c6b9 | 385 | squashfs_decompressor_destroy(msblk); |
0aa66619 PL |
386 | kfree(msblk->inode_lookup_table); |
387 | kfree(msblk->fragment_index); | |
388 | kfree(msblk->id_table); | |
4b5397dc | 389 | kfree(msblk->xattr_id_table); |
0aa66619 PL |
390 | kfree(sb->s_fs_info); |
391 | sb->s_fs_info = NULL; | |
392 | kfree(sblk); | |
393 | return err; | |
0aa66619 PL |
394 | } |
395 | ||
5a2be128 DH |
396 | static int squashfs_get_tree(struct fs_context *fc) |
397 | { | |
398 | return get_tree_bdev(fc, squashfs_fill_super); | |
399 | } | |
400 | ||
401 | static int squashfs_reconfigure(struct fs_context *fc) | |
402 | { | |
10dde05b VW |
403 | struct super_block *sb = fc->root->d_sb; |
404 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
405 | struct squashfs_mount_opts *opts = fc->fs_private; | |
406 | ||
5a2be128 DH |
407 | sync_filesystem(fc->root->d_sb); |
408 | fc->sb_flags |= SB_RDONLY; | |
10dde05b VW |
409 | |
410 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); | |
411 | ||
5a2be128 DH |
412 | return 0; |
413 | } | |
414 | ||
10dde05b VW |
415 | static void squashfs_free_fs_context(struct fs_context *fc) |
416 | { | |
417 | kfree(fc->fs_private); | |
418 | } | |
419 | ||
5a2be128 DH |
420 | static const struct fs_context_operations squashfs_context_ops = { |
421 | .get_tree = squashfs_get_tree, | |
10dde05b VW |
422 | .free = squashfs_free_fs_context, |
423 | .parse_param = squashfs_parse_param, | |
5a2be128 DH |
424 | .reconfigure = squashfs_reconfigure, |
425 | }; | |
426 | ||
10dde05b VW |
427 | static int squashfs_show_options(struct seq_file *s, struct dentry *root) |
428 | { | |
429 | struct super_block *sb = root->d_sb; | |
430 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
431 | ||
432 | if (msblk->panic_on_errors) | |
433 | seq_puts(s, ",errors=panic"); | |
434 | else | |
435 | seq_puts(s, ",errors=continue"); | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
5a2be128 DH |
440 | static int squashfs_init_fs_context(struct fs_context *fc) |
441 | { | |
10dde05b VW |
442 | struct squashfs_mount_opts *opts; |
443 | ||
444 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
445 | if (!opts) | |
446 | return -ENOMEM; | |
447 | ||
448 | fc->fs_private = opts; | |
5a2be128 DH |
449 | fc->ops = &squashfs_context_ops; |
450 | return 0; | |
451 | } | |
0aa66619 PL |
452 | |
453 | static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
454 | { | |
455 | struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | |
2fc7f562 | 456 | u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); |
0aa66619 PL |
457 | |
458 | TRACE("Entered squashfs_statfs\n"); | |
459 | ||
460 | buf->f_type = SQUASHFS_MAGIC; | |
461 | buf->f_bsize = msblk->block_size; | |
462 | buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; | |
463 | buf->f_bfree = buf->f_bavail = 0; | |
464 | buf->f_files = msblk->inodes; | |
465 | buf->f_ffree = 0; | |
466 | buf->f_namelen = SQUASHFS_NAME_LEN; | |
6d1349c7 | 467 | buf->f_fsid = u64_to_fsid(id); |
0aa66619 PL |
468 | |
469 | return 0; | |
470 | } | |
471 | ||
472 | ||
0aa66619 PL |
473 | static void squashfs_put_super(struct super_block *sb) |
474 | { | |
475 | if (sb->s_fs_info) { | |
476 | struct squashfs_sb_info *sbi = sb->s_fs_info; | |
477 | squashfs_cache_delete(sbi->block_cache); | |
478 | squashfs_cache_delete(sbi->fragment_cache); | |
479 | squashfs_cache_delete(sbi->read_page); | |
9508c6b9 | 480 | squashfs_decompressor_destroy(sbi); |
0aa66619 PL |
481 | kfree(sbi->id_table); |
482 | kfree(sbi->fragment_index); | |
483 | kfree(sbi->meta_index); | |
370ec3d1 | 484 | kfree(sbi->inode_lookup_table); |
4b5397dc | 485 | kfree(sbi->xattr_id_table); |
0aa66619 PL |
486 | kfree(sb->s_fs_info); |
487 | sb->s_fs_info = NULL; | |
488 | } | |
489 | } | |
490 | ||
0aa66619 PL |
491 | static struct kmem_cache *squashfs_inode_cachep; |
492 | ||
493 | ||
494 | static void init_once(void *foo) | |
495 | { | |
496 | struct squashfs_inode_info *ei = foo; | |
497 | ||
498 | inode_init_once(&ei->vfs_inode); | |
499 | } | |
500 | ||
501 | ||
502 | static int __init init_inodecache(void) | |
503 | { | |
504 | squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | |
505 | sizeof(struct squashfs_inode_info), 0, | |
5d097056 VD |
506 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
507 | init_once); | |
0aa66619 PL |
508 | |
509 | return squashfs_inode_cachep ? 0 : -ENOMEM; | |
510 | } | |
511 | ||
512 | ||
513 | static void destroy_inodecache(void) | |
514 | { | |
8c0a8537 KS |
515 | /* |
516 | * Make sure all delayed rcu free inodes are flushed before we | |
517 | * destroy cache. | |
518 | */ | |
519 | rcu_barrier(); | |
0aa66619 PL |
520 | kmem_cache_destroy(squashfs_inode_cachep); |
521 | } | |
522 | ||
523 | ||
524 | static int __init init_squashfs_fs(void) | |
525 | { | |
526 | int err = init_inodecache(); | |
527 | ||
528 | if (err) | |
529 | return err; | |
530 | ||
531 | err = register_filesystem(&squashfs_fs_type); | |
532 | if (err) { | |
533 | destroy_inodecache(); | |
534 | return err; | |
535 | } | |
536 | ||
c811f5f4 | 537 | pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); |
0aa66619 PL |
538 | |
539 | return 0; | |
540 | } | |
541 | ||
542 | ||
543 | static void __exit exit_squashfs_fs(void) | |
544 | { | |
545 | unregister_filesystem(&squashfs_fs_type); | |
546 | destroy_inodecache(); | |
547 | } | |
548 | ||
549 | ||
550 | static struct inode *squashfs_alloc_inode(struct super_block *sb) | |
551 | { | |
552 | struct squashfs_inode_info *ei = | |
553 | kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL); | |
554 | ||
555 | return ei ? &ei->vfs_inode : NULL; | |
556 | } | |
557 | ||
558 | ||
56b5af19 | 559 | static void squashfs_free_inode(struct inode *inode) |
0aa66619 PL |
560 | { |
561 | kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); | |
562 | } | |
563 | ||
0aa66619 PL |
564 | static struct file_system_type squashfs_fs_type = { |
565 | .owner = THIS_MODULE, | |
566 | .name = "squashfs", | |
5a2be128 | 567 | .init_fs_context = squashfs_init_fs_context, |
10dde05b | 568 | .parameters = squashfs_fs_parameters, |
0aa66619 PL |
569 | .kill_sb = kill_block_super, |
570 | .fs_flags = FS_REQUIRES_DEV | |
571 | }; | |
3e64fe5b | 572 | MODULE_ALIAS_FS("squashfs"); |
0aa66619 | 573 | |
b87221de | 574 | static const struct super_operations squashfs_super_ops = { |
0aa66619 | 575 | .alloc_inode = squashfs_alloc_inode, |
56b5af19 | 576 | .free_inode = squashfs_free_inode, |
0aa66619 PL |
577 | .statfs = squashfs_statfs, |
578 | .put_super = squashfs_put_super, | |
10dde05b | 579 | .show_options = squashfs_show_options, |
0aa66619 PL |
580 | }; |
581 | ||
582 | module_init(init_squashfs_fs); | |
583 | module_exit(exit_squashfs_fs); | |
584 | MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); | |
d7f2ff67 | 585 | MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>"); |
0aa66619 | 586 | MODULE_LICENSE("GPL"); |