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 | ||
be9a7b3e | 19 | #include <linux/blkdev.h> |
0aa66619 | 20 | #include <linux/fs.h> |
5a2be128 | 21 | #include <linux/fs_context.h> |
10dde05b | 22 | #include <linux/fs_parser.h> |
0aa66619 PL |
23 | #include <linux/vfs.h> |
24 | #include <linux/slab.h> | |
25 | #include <linux/mutex.h> | |
10dde05b | 26 | #include <linux/seq_file.h> |
0aa66619 PL |
27 | #include <linux/pagemap.h> |
28 | #include <linux/init.h> | |
29 | #include <linux/module.h> | |
1bcbf313 | 30 | #include <linux/magic.h> |
4b5397dc | 31 | #include <linux/xattr.h> |
0aa66619 PL |
32 | |
33 | #include "squashfs_fs.h" | |
34 | #include "squashfs_fs_sb.h" | |
35 | #include "squashfs_fs_i.h" | |
36 | #include "squashfs.h" | |
4c0f0bb2 | 37 | #include "decompressor.h" |
01e5b4e4 | 38 | #include "xattr.h" |
0aa66619 PL |
39 | |
40 | static struct file_system_type squashfs_fs_type; | |
b87221de | 41 | static const struct super_operations squashfs_super_ops; |
0aa66619 | 42 | |
10dde05b VW |
43 | enum Opt_errors { |
44 | Opt_errors_continue, | |
45 | Opt_errors_panic, | |
46 | }; | |
47 | ||
48 | enum squashfs_param { | |
49 | Opt_errors, | |
80f78409 | 50 | Opt_threads, |
10dde05b VW |
51 | }; |
52 | ||
53 | struct squashfs_mount_opts { | |
54 | enum Opt_errors errors; | |
80f78409 | 55 | const struct squashfs_decompressor_thread_ops *thread_ops; |
fb40fe04 | 56 | int thread_num; |
10dde05b VW |
57 | }; |
58 | ||
59 | static const struct constant_table squashfs_param_errors[] = { | |
60 | {"continue", Opt_errors_continue }, | |
61 | {"panic", Opt_errors_panic }, | |
62 | {} | |
63 | }; | |
64 | ||
65 | static const struct fs_parameter_spec squashfs_fs_parameters[] = { | |
66 | fsparam_enum("errors", Opt_errors, squashfs_param_errors), | |
80f78409 | 67 | fsparam_string("threads", Opt_threads), |
10dde05b VW |
68 | {} |
69 | }; | |
70 | ||
fb40fe04 XN |
71 | |
72 | static int squashfs_parse_param_threads_str(const char *str, struct squashfs_mount_opts *opts) | |
80f78409 XN |
73 | { |
74 | #ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT | |
75 | if (strcmp(str, "single") == 0) { | |
76 | opts->thread_ops = &squashfs_decompressor_single; | |
77 | return 0; | |
78 | } | |
79 | if (strcmp(str, "multi") == 0) { | |
80 | opts->thread_ops = &squashfs_decompressor_multi; | |
81 | return 0; | |
82 | } | |
83 | if (strcmp(str, "percpu") == 0) { | |
84 | opts->thread_ops = &squashfs_decompressor_percpu; | |
85 | return 0; | |
86 | } | |
87 | #endif | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
fb40fe04 XN |
91 | static int squashfs_parse_param_threads_num(const char *str, struct squashfs_mount_opts *opts) |
92 | { | |
93 | #ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS | |
94 | int ret; | |
95 | unsigned long num; | |
96 | ||
97 | ret = kstrtoul(str, 0, &num); | |
98 | if (ret != 0) | |
99 | return -EINVAL; | |
100 | if (num > 1) { | |
101 | opts->thread_ops = &squashfs_decompressor_multi; | |
102 | if (num > opts->thread_ops->max_decompressors()) | |
103 | return -EINVAL; | |
104 | opts->thread_num = (int)num; | |
105 | return 0; | |
106 | } | |
107 | #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE | |
108 | if (num == 1) { | |
109 | opts->thread_ops = &squashfs_decompressor_single; | |
110 | opts->thread_num = 1; | |
111 | return 0; | |
112 | } | |
113 | #endif | |
114 | #endif /* !CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS */ | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
118 | static int squashfs_parse_param_threads(const char *str, struct squashfs_mount_opts *opts) | |
119 | { | |
120 | int ret = squashfs_parse_param_threads_str(str, opts); | |
121 | ||
122 | if (ret == 0) | |
123 | return ret; | |
124 | return squashfs_parse_param_threads_num(str, opts); | |
125 | } | |
126 | ||
10dde05b VW |
127 | static int squashfs_parse_param(struct fs_context *fc, struct fs_parameter *param) |
128 | { | |
129 | struct squashfs_mount_opts *opts = fc->fs_private; | |
130 | struct fs_parse_result result; | |
131 | int opt; | |
132 | ||
133 | opt = fs_parse(fc, squashfs_fs_parameters, param, &result); | |
134 | if (opt < 0) | |
135 | return opt; | |
136 | ||
137 | switch (opt) { | |
138 | case Opt_errors: | |
139 | opts->errors = result.uint_32; | |
140 | break; | |
80f78409 XN |
141 | case Opt_threads: |
142 | if (squashfs_parse_param_threads(param->string, opts) != 0) | |
143 | return -EINVAL; | |
144 | break; | |
10dde05b VW |
145 | default: |
146 | return -EINVAL; | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
5a2be128 DH |
152 | static const struct squashfs_decompressor *supported_squashfs_filesystem( |
153 | struct fs_context *fc, | |
154 | short major, short minor, short id) | |
0aa66619 | 155 | { |
4c0f0bb2 PL |
156 | const struct squashfs_decompressor *decompressor; |
157 | ||
0aa66619 | 158 | if (major < SQUASHFS_MAJOR) { |
5a2be128 DH |
159 | errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d " |
160 | "filesystems are unsupported", major, minor); | |
4c0f0bb2 | 161 | return NULL; |
0aa66619 | 162 | } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { |
5a2be128 DH |
163 | errorf(fc, "Major/Minor mismatch, trying to mount newer " |
164 | "%d.%d filesystem", major, minor); | |
165 | errorf(fc, "Please update your kernel"); | |
4c0f0bb2 | 166 | return NULL; |
0aa66619 PL |
167 | } |
168 | ||
4c0f0bb2 PL |
169 | decompressor = squashfs_lookup_decompressor(id); |
170 | if (!decompressor->supported) { | |
5a2be128 DH |
171 | errorf(fc, "Filesystem uses \"%s\" compression. This is not supported", |
172 | decompressor->name); | |
4c0f0bb2 PL |
173 | return NULL; |
174 | } | |
0aa66619 | 175 | |
4c0f0bb2 | 176 | return decompressor; |
0aa66619 PL |
177 | } |
178 | ||
179 | ||
5a2be128 | 180 | static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc) |
0aa66619 | 181 | { |
10dde05b | 182 | struct squashfs_mount_opts *opts = fc->fs_private; |
0aa66619 PL |
183 | struct squashfs_sb_info *msblk; |
184 | struct squashfs_super_block *sblk = NULL; | |
0aa66619 PL |
185 | struct inode *root; |
186 | long long root_inode; | |
187 | unsigned short flags; | |
188 | unsigned int fragments; | |
37986f63 | 189 | u64 lookup_table_start, xattr_id_table_start, next_table; |
0aa66619 PL |
190 | int err; |
191 | ||
192 | TRACE("Entered squashfs_fill_superblock\n"); | |
193 | ||
194 | sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL); | |
195 | if (sb->s_fs_info == NULL) { | |
196 | ERROR("Failed to allocate squashfs_sb_info\n"); | |
197 | return -ENOMEM; | |
198 | } | |
199 | msblk = sb->s_fs_info; | |
c7e8d327 | 200 | msblk->thread_ops = opts->thread_ops; |
0aa66619 | 201 | |
10dde05b VW |
202 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); |
203 | ||
7657cacf | 204 | msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); |
0aa66619 PL |
205 | msblk->devblksize_log2 = ffz(~msblk->devblksize); |
206 | ||
0aa66619 PL |
207 | mutex_init(&msblk->meta_index_mutex); |
208 | ||
209 | /* | |
210 | * msblk->bytes_used is checked in squashfs_read_table to ensure reads | |
211 | * are not beyond filesystem end. But as we're using | |
212 | * squashfs_read_table here to read the superblock (including the value | |
213 | * of bytes_used) we need to set it to an initial sensible dummy value | |
214 | */ | |
215 | msblk->bytes_used = sizeof(*sblk); | |
82de647e | 216 | sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk)); |
0aa66619 | 217 | |
82de647e | 218 | if (IS_ERR(sblk)) { |
5a2be128 | 219 | errorf(fc, "unable to read squashfs_super_block"); |
82de647e PL |
220 | err = PTR_ERR(sblk); |
221 | sblk = NULL; | |
0aa66619 PL |
222 | goto failed_mount; |
223 | } | |
224 | ||
4c0f0bb2 PL |
225 | err = -EINVAL; |
226 | ||
0aa66619 PL |
227 | /* Check it is a SQUASHFS superblock */ |
228 | sb->s_magic = le32_to_cpu(sblk->s_magic); | |
229 | if (sb->s_magic != SQUASHFS_MAGIC) { | |
5a2be128 DH |
230 | if (!(fc->sb_flags & SB_SILENT)) |
231 | errorf(fc, "Can't find a SQUASHFS superblock on %pg", | |
232 | sb->s_bdev); | |
0aa66619 PL |
233 | goto failed_mount; |
234 | } | |
c7e8d327 | 235 | |
fb40fe04 XN |
236 | if (opts->thread_num == 0) { |
237 | msblk->max_thread_num = msblk->thread_ops->max_decompressors(); | |
238 | } else { | |
239 | msblk->max_thread_num = opts->thread_num; | |
240 | } | |
0aa66619 | 241 | |
4c0f0bb2 PL |
242 | /* Check the MAJOR & MINOR versions and lookup compression type */ |
243 | msblk->decompressor = supported_squashfs_filesystem( | |
5a2be128 | 244 | fc, |
4c0f0bb2 | 245 | le16_to_cpu(sblk->s_major), |
0aa66619 PL |
246 | le16_to_cpu(sblk->s_minor), |
247 | le16_to_cpu(sblk->compression)); | |
4c0f0bb2 | 248 | if (msblk->decompressor == NULL) |
0aa66619 PL |
249 | goto failed_mount; |
250 | ||
0aa66619 PL |
251 | /* Check the filesystem does not extend beyond the end of the |
252 | block device */ | |
253 | msblk->bytes_used = le64_to_cpu(sblk->bytes_used); | |
be9a7b3e CH |
254 | if (msblk->bytes_used < 0 || |
255 | msblk->bytes_used > bdev_nr_bytes(sb->s_bdev)) | |
0aa66619 PL |
256 | goto failed_mount; |
257 | ||
258 | /* Check block size for sanity */ | |
259 | msblk->block_size = le32_to_cpu(sblk->block_size); | |
260 | if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE) | |
5a2be128 | 261 | goto insanity; |
0aa66619 | 262 | |
fffb47b8 PL |
263 | /* |
264 | * Check the system page size is not larger than the filesystem | |
265 | * block size (by default 128K). This is currently not supported. | |
266 | */ | |
09cbfeaf | 267 | if (PAGE_SIZE > msblk->block_size) { |
5a2be128 DH |
268 | errorf(fc, "Page size > filesystem block size (%d). This is " |
269 | "currently not supported!", msblk->block_size); | |
fffb47b8 PL |
270 | goto failed_mount; |
271 | } | |
272 | ||
4b0180a4 | 273 | /* Check block log for sanity */ |
0aa66619 PL |
274 | msblk->block_log = le16_to_cpu(sblk->block_log); |
275 | if (msblk->block_log > SQUASHFS_FILE_MAX_LOG) | |
276 | goto failed_mount; | |
277 | ||
4b0180a4 PL |
278 | /* Check that block_size and block_log match */ |
279 | if (msblk->block_size != (1 << msblk->block_log)) | |
5a2be128 | 280 | goto insanity; |
4b0180a4 | 281 | |
0aa66619 PL |
282 | /* Check the root inode for sanity */ |
283 | root_inode = le64_to_cpu(sblk->root_inode); | |
284 | if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE) | |
5a2be128 | 285 | goto insanity; |
0aa66619 PL |
286 | |
287 | msblk->inode_table = le64_to_cpu(sblk->inode_table_start); | |
288 | msblk->directory_table = le64_to_cpu(sblk->directory_table_start); | |
289 | msblk->inodes = le32_to_cpu(sblk->inodes); | |
71755ee5 | 290 | msblk->fragments = le32_to_cpu(sblk->fragments); |
f37aa4c7 | 291 | msblk->ids = le16_to_cpu(sblk->no_ids); |
0aa66619 PL |
292 | flags = le16_to_cpu(sblk->flags); |
293 | ||
a1c6f057 | 294 | TRACE("Found valid superblock on %pg\n", sb->s_bdev); |
0aa66619 PL |
295 | TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags) |
296 | ? "un" : ""); | |
297 | TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags) | |
298 | ? "un" : ""); | |
299 | TRACE("Filesystem size %lld bytes\n", msblk->bytes_used); | |
300 | TRACE("Block size %d\n", msblk->block_size); | |
301 | TRACE("Number of inodes %d\n", msblk->inodes); | |
71755ee5 | 302 | TRACE("Number of fragments %d\n", msblk->fragments); |
f37aa4c7 | 303 | TRACE("Number of ids %d\n", msblk->ids); |
0aa66619 PL |
304 | TRACE("sblk->inode_table_start %llx\n", msblk->inode_table); |
305 | TRACE("sblk->directory_table_start %llx\n", msblk->directory_table); | |
306 | TRACE("sblk->fragment_table_start %llx\n", | |
307 | (u64) le64_to_cpu(sblk->fragment_table_start)); | |
308 | TRACE("sblk->id_table_start %llx\n", | |
309 | (u64) le64_to_cpu(sblk->id_table_start)); | |
310 | ||
311 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
22b13969 DD |
312 | sb->s_time_min = 0; |
313 | sb->s_time_max = U32_MAX; | |
1751e8a6 | 314 | sb->s_flags |= SB_RDONLY; |
0aa66619 PL |
315 | sb->s_op = &squashfs_super_ops; |
316 | ||
317 | err = -ENOMEM; | |
318 | ||
319 | msblk->block_cache = squashfs_cache_init("metadata", | |
320 | SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); | |
321 | if (msblk->block_cache == NULL) | |
322 | goto failed_mount; | |
323 | ||
324 | /* Allocate read_page block */ | |
9508c6b9 | 325 | msblk->read_page = squashfs_cache_init("data", |
fb40fe04 | 326 | msblk->max_thread_num, msblk->block_size); |
0aa66619 | 327 | if (msblk->read_page == NULL) { |
5a2be128 | 328 | errorf(fc, "Failed to allocate read_page block"); |
0aa66619 PL |
329 | goto failed_mount; |
330 | } | |
331 | ||
e994f5b6 VW |
332 | if (msblk->devblksize == PAGE_SIZE) { |
333 | struct inode *cache = new_inode(sb); | |
334 | ||
335 | if (cache == NULL) | |
336 | goto failed_mount; | |
337 | ||
338 | set_nlink(cache, 1); | |
339 | cache->i_size = OFFSET_MAX; | |
340 | mapping_set_gfp_mask(cache->i_mapping, GFP_NOFS); | |
341 | ||
342 | msblk->cache_mapping = cache->i_mapping; | |
343 | } | |
344 | ||
9508c6b9 | 345 | msblk->stream = squashfs_decompressor_setup(sb, flags); |
b7fc0ff0 PL |
346 | if (IS_ERR(msblk->stream)) { |
347 | err = PTR_ERR(msblk->stream); | |
348 | msblk->stream = NULL; | |
5a2be128 | 349 | goto insanity; |
b7fc0ff0 PL |
350 | } |
351 | ||
76e002f7 PL |
352 | /* Handle xattrs */ |
353 | sb->s_xattr = squashfs_xattr_handlers; | |
354 | xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); | |
37986f63 PL |
355 | if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { |
356 | next_table = msblk->bytes_used; | |
76e002f7 | 357 | goto allocate_id_index_table; |
37986f63 | 358 | } |
76e002f7 PL |
359 | |
360 | /* Allocate and read xattr id lookup table */ | |
361 | msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, | |
362 | xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); | |
363 | if (IS_ERR(msblk->xattr_id_table)) { | |
5a2be128 | 364 | errorf(fc, "unable to read xattr id index table"); |
76e002f7 PL |
365 | err = PTR_ERR(msblk->xattr_id_table); |
366 | msblk->xattr_id_table = NULL; | |
367 | if (err != -ENOTSUPP) | |
368 | goto failed_mount; | |
369 | } | |
37986f63 | 370 | next_table = msblk->xattr_table; |
76e002f7 PL |
371 | |
372 | allocate_id_index_table: | |
0aa66619 PL |
373 | /* Allocate and read id index table */ |
374 | msblk->id_table = squashfs_read_id_index_table(sb, | |
f37aa4c7 | 375 | le64_to_cpu(sblk->id_table_start), next_table, msblk->ids); |
0aa66619 | 376 | if (IS_ERR(msblk->id_table)) { |
5a2be128 | 377 | errorf(fc, "unable to read id index table"); |
0aa66619 PL |
378 | err = PTR_ERR(msblk->id_table); |
379 | msblk->id_table = NULL; | |
380 | goto failed_mount; | |
381 | } | |
d5b72ce1 | 382 | next_table = le64_to_cpu(msblk->id_table[0]); |
0aa66619 | 383 | |
76e002f7 PL |
384 | /* Handle inode lookup table */ |
385 | lookup_table_start = le64_to_cpu(sblk->lookup_table_start); | |
386 | if (lookup_table_start == SQUASHFS_INVALID_BLK) | |
387 | goto handle_fragments; | |
388 | ||
389 | /* Allocate and read inode lookup table */ | |
390 | msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, | |
ac51a0a7 | 391 | lookup_table_start, next_table, msblk->inodes); |
76e002f7 | 392 | if (IS_ERR(msblk->inode_lookup_table)) { |
5a2be128 | 393 | errorf(fc, "unable to read inode lookup table"); |
76e002f7 PL |
394 | err = PTR_ERR(msblk->inode_lookup_table); |
395 | msblk->inode_lookup_table = NULL; | |
396 | goto failed_mount; | |
397 | } | |
d5b72ce1 | 398 | next_table = le64_to_cpu(msblk->inode_lookup_table[0]); |
76e002f7 PL |
399 | |
400 | sb->s_export_op = &squashfs_export_ops; | |
401 | ||
402 | handle_fragments: | |
71755ee5 | 403 | fragments = msblk->fragments; |
0aa66619 | 404 | if (fragments == 0) |
1094a4a6 | 405 | goto check_directory_table; |
0aa66619 PL |
406 | |
407 | msblk->fragment_cache = squashfs_cache_init("fragment", | |
408 | SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); | |
409 | if (msblk->fragment_cache == NULL) { | |
410 | err = -ENOMEM; | |
411 | goto failed_mount; | |
412 | } | |
413 | ||
414 | /* Allocate and read fragment index table */ | |
415 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, | |
1cac63cc | 416 | le64_to_cpu(sblk->fragment_table_start), next_table, fragments); |
0aa66619 | 417 | if (IS_ERR(msblk->fragment_index)) { |
5a2be128 | 418 | errorf(fc, "unable to read fragment index table"); |
0aa66619 PL |
419 | err = PTR_ERR(msblk->fragment_index); |
420 | msblk->fragment_index = NULL; | |
421 | goto failed_mount; | |
422 | } | |
d5b72ce1 | 423 | next_table = le64_to_cpu(msblk->fragment_index[0]); |
0aa66619 | 424 | |
1094a4a6 PL |
425 | check_directory_table: |
426 | /* Sanity check directory_table */ | |
cc37f75a | 427 | if (msblk->directory_table > next_table) { |
1094a4a6 | 428 | err = -EINVAL; |
5a2be128 | 429 | goto insanity; |
1094a4a6 PL |
430 | } |
431 | ||
432 | /* Sanity check inode_table */ | |
433 | if (msblk->inode_table >= msblk->directory_table) { | |
434 | err = -EINVAL; | |
5a2be128 | 435 | goto insanity; |
1094a4a6 PL |
436 | } |
437 | ||
438 | /* allocate root */ | |
0aa66619 PL |
439 | root = new_inode(sb); |
440 | if (!root) { | |
441 | err = -ENOMEM; | |
442 | goto failed_mount; | |
443 | } | |
444 | ||
445 | err = squashfs_read_inode(root, root_inode); | |
446 | if (err) { | |
1cb08e97 PL |
447 | make_bad_inode(root); |
448 | iput(root); | |
0aa66619 PL |
449 | goto failed_mount; |
450 | } | |
451 | insert_inode_hash(root); | |
452 | ||
48fde701 | 453 | sb->s_root = d_make_root(root); |
0aa66619 PL |
454 | if (sb->s_root == NULL) { |
455 | ERROR("Root inode create failed\n"); | |
456 | err = -ENOMEM; | |
0aa66619 PL |
457 | goto failed_mount; |
458 | } | |
459 | ||
460 | TRACE("Leaving squashfs_fill_super\n"); | |
461 | kfree(sblk); | |
462 | return 0; | |
463 | ||
5a2be128 DH |
464 | insanity: |
465 | errorf(fc, "squashfs image failed sanity check"); | |
0aa66619 PL |
466 | failed_mount: |
467 | squashfs_cache_delete(msblk->block_cache); | |
468 | squashfs_cache_delete(msblk->fragment_cache); | |
469 | squashfs_cache_delete(msblk->read_page); | |
e994f5b6 VW |
470 | if (msblk->cache_mapping) |
471 | iput(msblk->cache_mapping->host); | |
80f78409 | 472 | msblk->thread_ops->destroy(msblk); |
0aa66619 PL |
473 | kfree(msblk->inode_lookup_table); |
474 | kfree(msblk->fragment_index); | |
475 | kfree(msblk->id_table); | |
4b5397dc | 476 | kfree(msblk->xattr_id_table); |
0aa66619 PL |
477 | kfree(sb->s_fs_info); |
478 | sb->s_fs_info = NULL; | |
479 | kfree(sblk); | |
480 | return err; | |
0aa66619 PL |
481 | } |
482 | ||
5a2be128 DH |
483 | static int squashfs_get_tree(struct fs_context *fc) |
484 | { | |
485 | return get_tree_bdev(fc, squashfs_fill_super); | |
486 | } | |
487 | ||
488 | static int squashfs_reconfigure(struct fs_context *fc) | |
489 | { | |
10dde05b VW |
490 | struct super_block *sb = fc->root->d_sb; |
491 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
492 | struct squashfs_mount_opts *opts = fc->fs_private; | |
493 | ||
5a2be128 DH |
494 | sync_filesystem(fc->root->d_sb); |
495 | fc->sb_flags |= SB_RDONLY; | |
10dde05b VW |
496 | |
497 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); | |
498 | ||
5a2be128 DH |
499 | return 0; |
500 | } | |
501 | ||
10dde05b VW |
502 | static void squashfs_free_fs_context(struct fs_context *fc) |
503 | { | |
504 | kfree(fc->fs_private); | |
505 | } | |
506 | ||
5a2be128 DH |
507 | static const struct fs_context_operations squashfs_context_ops = { |
508 | .get_tree = squashfs_get_tree, | |
10dde05b VW |
509 | .free = squashfs_free_fs_context, |
510 | .parse_param = squashfs_parse_param, | |
5a2be128 DH |
511 | .reconfigure = squashfs_reconfigure, |
512 | }; | |
513 | ||
10dde05b VW |
514 | static int squashfs_show_options(struct seq_file *s, struct dentry *root) |
515 | { | |
516 | struct super_block *sb = root->d_sb; | |
517 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
518 | ||
519 | if (msblk->panic_on_errors) | |
520 | seq_puts(s, ",errors=panic"); | |
521 | else | |
522 | seq_puts(s, ",errors=continue"); | |
523 | ||
80f78409 XN |
524 | #ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT |
525 | if (msblk->thread_ops == &squashfs_decompressor_single) { | |
526 | seq_puts(s, ",threads=single"); | |
527 | return 0; | |
528 | } | |
80f78409 XN |
529 | if (msblk->thread_ops == &squashfs_decompressor_percpu) { |
530 | seq_puts(s, ",threads=percpu"); | |
531 | return 0; | |
532 | } | |
fb40fe04 XN |
533 | #endif |
534 | #ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS | |
535 | seq_printf(s, ",threads=%d", msblk->max_thread_num); | |
80f78409 | 536 | #endif |
10dde05b VW |
537 | return 0; |
538 | } | |
539 | ||
5a2be128 DH |
540 | static int squashfs_init_fs_context(struct fs_context *fc) |
541 | { | |
10dde05b VW |
542 | struct squashfs_mount_opts *opts; |
543 | ||
544 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
545 | if (!opts) | |
546 | return -ENOMEM; | |
547 | ||
80f78409 XN |
548 | #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE |
549 | opts->thread_ops = &squashfs_decompressor_single; | |
550 | #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI) | |
551 | opts->thread_ops = &squashfs_decompressor_multi; | |
552 | #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU) | |
553 | opts->thread_ops = &squashfs_decompressor_percpu; | |
554 | #else | |
555 | #error "fail: unknown squashfs decompression thread mode?" | |
556 | #endif | |
fb40fe04 | 557 | opts->thread_num = 0; |
10dde05b | 558 | fc->fs_private = opts; |
5a2be128 DH |
559 | fc->ops = &squashfs_context_ops; |
560 | return 0; | |
561 | } | |
0aa66619 PL |
562 | |
563 | static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
564 | { | |
565 | struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | |
2fc7f562 | 566 | u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); |
0aa66619 PL |
567 | |
568 | TRACE("Entered squashfs_statfs\n"); | |
569 | ||
570 | buf->f_type = SQUASHFS_MAGIC; | |
571 | buf->f_bsize = msblk->block_size; | |
572 | buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; | |
573 | buf->f_bfree = buf->f_bavail = 0; | |
574 | buf->f_files = msblk->inodes; | |
575 | buf->f_ffree = 0; | |
576 | buf->f_namelen = SQUASHFS_NAME_LEN; | |
6d1349c7 | 577 | buf->f_fsid = u64_to_fsid(id); |
0aa66619 PL |
578 | |
579 | return 0; | |
580 | } | |
581 | ||
582 | ||
0aa66619 PL |
583 | static void squashfs_put_super(struct super_block *sb) |
584 | { | |
585 | if (sb->s_fs_info) { | |
586 | struct squashfs_sb_info *sbi = sb->s_fs_info; | |
587 | squashfs_cache_delete(sbi->block_cache); | |
588 | squashfs_cache_delete(sbi->fragment_cache); | |
589 | squashfs_cache_delete(sbi->read_page); | |
e994f5b6 VW |
590 | if (sbi->cache_mapping) |
591 | iput(sbi->cache_mapping->host); | |
80f78409 | 592 | sbi->thread_ops->destroy(sbi); |
0aa66619 PL |
593 | kfree(sbi->id_table); |
594 | kfree(sbi->fragment_index); | |
595 | kfree(sbi->meta_index); | |
370ec3d1 | 596 | kfree(sbi->inode_lookup_table); |
4b5397dc | 597 | kfree(sbi->xattr_id_table); |
0aa66619 PL |
598 | kfree(sb->s_fs_info); |
599 | sb->s_fs_info = NULL; | |
600 | } | |
601 | } | |
602 | ||
0aa66619 PL |
603 | static struct kmem_cache *squashfs_inode_cachep; |
604 | ||
605 | ||
606 | static void init_once(void *foo) | |
607 | { | |
608 | struct squashfs_inode_info *ei = foo; | |
609 | ||
610 | inode_init_once(&ei->vfs_inode); | |
611 | } | |
612 | ||
613 | ||
614 | static int __init init_inodecache(void) | |
615 | { | |
616 | squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | |
617 | sizeof(struct squashfs_inode_info), 0, | |
5d097056 VD |
618 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
619 | init_once); | |
0aa66619 PL |
620 | |
621 | return squashfs_inode_cachep ? 0 : -ENOMEM; | |
622 | } | |
623 | ||
624 | ||
625 | static void destroy_inodecache(void) | |
626 | { | |
8c0a8537 KS |
627 | /* |
628 | * Make sure all delayed rcu free inodes are flushed before we | |
629 | * destroy cache. | |
630 | */ | |
631 | rcu_barrier(); | |
0aa66619 PL |
632 | kmem_cache_destroy(squashfs_inode_cachep); |
633 | } | |
634 | ||
635 | ||
636 | static int __init init_squashfs_fs(void) | |
637 | { | |
638 | int err = init_inodecache(); | |
639 | ||
640 | if (err) | |
641 | return err; | |
642 | ||
643 | err = register_filesystem(&squashfs_fs_type); | |
644 | if (err) { | |
645 | destroy_inodecache(); | |
646 | return err; | |
647 | } | |
648 | ||
c811f5f4 | 649 | pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); |
0aa66619 PL |
650 | |
651 | return 0; | |
652 | } | |
653 | ||
654 | ||
655 | static void __exit exit_squashfs_fs(void) | |
656 | { | |
657 | unregister_filesystem(&squashfs_fs_type); | |
658 | destroy_inodecache(); | |
659 | } | |
660 | ||
661 | ||
662 | static struct inode *squashfs_alloc_inode(struct super_block *sb) | |
663 | { | |
664 | struct squashfs_inode_info *ei = | |
fd60b288 | 665 | alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL); |
0aa66619 PL |
666 | |
667 | return ei ? &ei->vfs_inode : NULL; | |
668 | } | |
669 | ||
670 | ||
56b5af19 | 671 | static void squashfs_free_inode(struct inode *inode) |
0aa66619 PL |
672 | { |
673 | kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); | |
674 | } | |
675 | ||
0aa66619 PL |
676 | static struct file_system_type squashfs_fs_type = { |
677 | .owner = THIS_MODULE, | |
678 | .name = "squashfs", | |
5a2be128 | 679 | .init_fs_context = squashfs_init_fs_context, |
10dde05b | 680 | .parameters = squashfs_fs_parameters, |
0aa66619 | 681 | .kill_sb = kill_block_super, |
42da66ac | 682 | .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, |
0aa66619 | 683 | }; |
3e64fe5b | 684 | MODULE_ALIAS_FS("squashfs"); |
0aa66619 | 685 | |
b87221de | 686 | static const struct super_operations squashfs_super_ops = { |
0aa66619 | 687 | .alloc_inode = squashfs_alloc_inode, |
56b5af19 | 688 | .free_inode = squashfs_free_inode, |
0aa66619 PL |
689 | .statfs = squashfs_statfs, |
690 | .put_super = squashfs_put_super, | |
10dde05b | 691 | .show_options = squashfs_show_options, |
0aa66619 PL |
692 | }; |
693 | ||
694 | module_init(init_squashfs_fs); | |
695 | module_exit(exit_squashfs_fs); | |
696 | MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); | |
d7f2ff67 | 697 | MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>"); |
0aa66619 | 698 | MODULE_LICENSE("GPL"); |