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 | ||
9508c6b9 | 332 | msblk->stream = squashfs_decompressor_setup(sb, flags); |
b7fc0ff0 PL |
333 | if (IS_ERR(msblk->stream)) { |
334 | err = PTR_ERR(msblk->stream); | |
335 | msblk->stream = NULL; | |
5a2be128 | 336 | goto insanity; |
b7fc0ff0 PL |
337 | } |
338 | ||
76e002f7 PL |
339 | /* Handle xattrs */ |
340 | sb->s_xattr = squashfs_xattr_handlers; | |
341 | xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); | |
37986f63 PL |
342 | if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { |
343 | next_table = msblk->bytes_used; | |
76e002f7 | 344 | goto allocate_id_index_table; |
37986f63 | 345 | } |
76e002f7 PL |
346 | |
347 | /* Allocate and read xattr id lookup table */ | |
348 | msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, | |
349 | xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); | |
350 | if (IS_ERR(msblk->xattr_id_table)) { | |
5a2be128 | 351 | errorf(fc, "unable to read xattr id index table"); |
76e002f7 PL |
352 | err = PTR_ERR(msblk->xattr_id_table); |
353 | msblk->xattr_id_table = NULL; | |
354 | if (err != -ENOTSUPP) | |
355 | goto failed_mount; | |
356 | } | |
37986f63 | 357 | next_table = msblk->xattr_table; |
76e002f7 PL |
358 | |
359 | allocate_id_index_table: | |
0aa66619 PL |
360 | /* Allocate and read id index table */ |
361 | msblk->id_table = squashfs_read_id_index_table(sb, | |
f37aa4c7 | 362 | le64_to_cpu(sblk->id_table_start), next_table, msblk->ids); |
0aa66619 | 363 | if (IS_ERR(msblk->id_table)) { |
5a2be128 | 364 | errorf(fc, "unable to read id index table"); |
0aa66619 PL |
365 | err = PTR_ERR(msblk->id_table); |
366 | msblk->id_table = NULL; | |
367 | goto failed_mount; | |
368 | } | |
d5b72ce1 | 369 | next_table = le64_to_cpu(msblk->id_table[0]); |
0aa66619 | 370 | |
76e002f7 PL |
371 | /* Handle inode lookup table */ |
372 | lookup_table_start = le64_to_cpu(sblk->lookup_table_start); | |
373 | if (lookup_table_start == SQUASHFS_INVALID_BLK) | |
374 | goto handle_fragments; | |
375 | ||
376 | /* Allocate and read inode lookup table */ | |
377 | msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, | |
ac51a0a7 | 378 | lookup_table_start, next_table, msblk->inodes); |
76e002f7 | 379 | if (IS_ERR(msblk->inode_lookup_table)) { |
5a2be128 | 380 | errorf(fc, "unable to read inode lookup table"); |
76e002f7 PL |
381 | err = PTR_ERR(msblk->inode_lookup_table); |
382 | msblk->inode_lookup_table = NULL; | |
383 | goto failed_mount; | |
384 | } | |
d5b72ce1 | 385 | next_table = le64_to_cpu(msblk->inode_lookup_table[0]); |
76e002f7 PL |
386 | |
387 | sb->s_export_op = &squashfs_export_ops; | |
388 | ||
389 | handle_fragments: | |
71755ee5 | 390 | fragments = msblk->fragments; |
0aa66619 | 391 | if (fragments == 0) |
1094a4a6 | 392 | goto check_directory_table; |
0aa66619 PL |
393 | |
394 | msblk->fragment_cache = squashfs_cache_init("fragment", | |
395 | SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); | |
396 | if (msblk->fragment_cache == NULL) { | |
397 | err = -ENOMEM; | |
398 | goto failed_mount; | |
399 | } | |
400 | ||
401 | /* Allocate and read fragment index table */ | |
402 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, | |
1cac63cc | 403 | le64_to_cpu(sblk->fragment_table_start), next_table, fragments); |
0aa66619 | 404 | if (IS_ERR(msblk->fragment_index)) { |
5a2be128 | 405 | errorf(fc, "unable to read fragment index table"); |
0aa66619 PL |
406 | err = PTR_ERR(msblk->fragment_index); |
407 | msblk->fragment_index = NULL; | |
408 | goto failed_mount; | |
409 | } | |
d5b72ce1 | 410 | next_table = le64_to_cpu(msblk->fragment_index[0]); |
0aa66619 | 411 | |
1094a4a6 PL |
412 | check_directory_table: |
413 | /* Sanity check directory_table */ | |
cc37f75a | 414 | if (msblk->directory_table > next_table) { |
1094a4a6 | 415 | err = -EINVAL; |
5a2be128 | 416 | goto insanity; |
1094a4a6 PL |
417 | } |
418 | ||
419 | /* Sanity check inode_table */ | |
420 | if (msblk->inode_table >= msblk->directory_table) { | |
421 | err = -EINVAL; | |
5a2be128 | 422 | goto insanity; |
1094a4a6 PL |
423 | } |
424 | ||
425 | /* allocate root */ | |
0aa66619 PL |
426 | root = new_inode(sb); |
427 | if (!root) { | |
428 | err = -ENOMEM; | |
429 | goto failed_mount; | |
430 | } | |
431 | ||
432 | err = squashfs_read_inode(root, root_inode); | |
433 | if (err) { | |
1cb08e97 PL |
434 | make_bad_inode(root); |
435 | iput(root); | |
0aa66619 PL |
436 | goto failed_mount; |
437 | } | |
438 | insert_inode_hash(root); | |
439 | ||
48fde701 | 440 | sb->s_root = d_make_root(root); |
0aa66619 PL |
441 | if (sb->s_root == NULL) { |
442 | ERROR("Root inode create failed\n"); | |
443 | err = -ENOMEM; | |
0aa66619 PL |
444 | goto failed_mount; |
445 | } | |
446 | ||
447 | TRACE("Leaving squashfs_fill_super\n"); | |
448 | kfree(sblk); | |
449 | return 0; | |
450 | ||
5a2be128 DH |
451 | insanity: |
452 | errorf(fc, "squashfs image failed sanity check"); | |
0aa66619 PL |
453 | failed_mount: |
454 | squashfs_cache_delete(msblk->block_cache); | |
455 | squashfs_cache_delete(msblk->fragment_cache); | |
456 | squashfs_cache_delete(msblk->read_page); | |
80f78409 | 457 | msblk->thread_ops->destroy(msblk); |
0aa66619 PL |
458 | kfree(msblk->inode_lookup_table); |
459 | kfree(msblk->fragment_index); | |
460 | kfree(msblk->id_table); | |
4b5397dc | 461 | kfree(msblk->xattr_id_table); |
0aa66619 PL |
462 | kfree(sb->s_fs_info); |
463 | sb->s_fs_info = NULL; | |
464 | kfree(sblk); | |
465 | return err; | |
0aa66619 PL |
466 | } |
467 | ||
5a2be128 DH |
468 | static int squashfs_get_tree(struct fs_context *fc) |
469 | { | |
470 | return get_tree_bdev(fc, squashfs_fill_super); | |
471 | } | |
472 | ||
473 | static int squashfs_reconfigure(struct fs_context *fc) | |
474 | { | |
10dde05b VW |
475 | struct super_block *sb = fc->root->d_sb; |
476 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
477 | struct squashfs_mount_opts *opts = fc->fs_private; | |
478 | ||
5a2be128 DH |
479 | sync_filesystem(fc->root->d_sb); |
480 | fc->sb_flags |= SB_RDONLY; | |
10dde05b VW |
481 | |
482 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); | |
483 | ||
5a2be128 DH |
484 | return 0; |
485 | } | |
486 | ||
10dde05b VW |
487 | static void squashfs_free_fs_context(struct fs_context *fc) |
488 | { | |
489 | kfree(fc->fs_private); | |
490 | } | |
491 | ||
5a2be128 DH |
492 | static const struct fs_context_operations squashfs_context_ops = { |
493 | .get_tree = squashfs_get_tree, | |
10dde05b VW |
494 | .free = squashfs_free_fs_context, |
495 | .parse_param = squashfs_parse_param, | |
5a2be128 DH |
496 | .reconfigure = squashfs_reconfigure, |
497 | }; | |
498 | ||
10dde05b VW |
499 | static int squashfs_show_options(struct seq_file *s, struct dentry *root) |
500 | { | |
501 | struct super_block *sb = root->d_sb; | |
502 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
503 | ||
504 | if (msblk->panic_on_errors) | |
505 | seq_puts(s, ",errors=panic"); | |
506 | else | |
507 | seq_puts(s, ",errors=continue"); | |
508 | ||
80f78409 XN |
509 | #ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT |
510 | if (msblk->thread_ops == &squashfs_decompressor_single) { | |
511 | seq_puts(s, ",threads=single"); | |
512 | return 0; | |
513 | } | |
80f78409 XN |
514 | if (msblk->thread_ops == &squashfs_decompressor_percpu) { |
515 | seq_puts(s, ",threads=percpu"); | |
516 | return 0; | |
517 | } | |
fb40fe04 XN |
518 | #endif |
519 | #ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS | |
520 | seq_printf(s, ",threads=%d", msblk->max_thread_num); | |
80f78409 | 521 | #endif |
10dde05b VW |
522 | return 0; |
523 | } | |
524 | ||
5a2be128 DH |
525 | static int squashfs_init_fs_context(struct fs_context *fc) |
526 | { | |
10dde05b VW |
527 | struct squashfs_mount_opts *opts; |
528 | ||
529 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
530 | if (!opts) | |
531 | return -ENOMEM; | |
532 | ||
80f78409 XN |
533 | #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE |
534 | opts->thread_ops = &squashfs_decompressor_single; | |
535 | #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI) | |
536 | opts->thread_ops = &squashfs_decompressor_multi; | |
537 | #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU) | |
538 | opts->thread_ops = &squashfs_decompressor_percpu; | |
539 | #else | |
540 | #error "fail: unknown squashfs decompression thread mode?" | |
541 | #endif | |
fb40fe04 | 542 | opts->thread_num = 0; |
10dde05b | 543 | fc->fs_private = opts; |
5a2be128 DH |
544 | fc->ops = &squashfs_context_ops; |
545 | return 0; | |
546 | } | |
0aa66619 PL |
547 | |
548 | static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
549 | { | |
550 | struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | |
2fc7f562 | 551 | u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); |
0aa66619 PL |
552 | |
553 | TRACE("Entered squashfs_statfs\n"); | |
554 | ||
555 | buf->f_type = SQUASHFS_MAGIC; | |
556 | buf->f_bsize = msblk->block_size; | |
557 | buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; | |
558 | buf->f_bfree = buf->f_bavail = 0; | |
559 | buf->f_files = msblk->inodes; | |
560 | buf->f_ffree = 0; | |
561 | buf->f_namelen = SQUASHFS_NAME_LEN; | |
6d1349c7 | 562 | buf->f_fsid = u64_to_fsid(id); |
0aa66619 PL |
563 | |
564 | return 0; | |
565 | } | |
566 | ||
567 | ||
0aa66619 PL |
568 | static void squashfs_put_super(struct super_block *sb) |
569 | { | |
570 | if (sb->s_fs_info) { | |
571 | struct squashfs_sb_info *sbi = sb->s_fs_info; | |
572 | squashfs_cache_delete(sbi->block_cache); | |
573 | squashfs_cache_delete(sbi->fragment_cache); | |
574 | squashfs_cache_delete(sbi->read_page); | |
80f78409 | 575 | sbi->thread_ops->destroy(sbi); |
0aa66619 PL |
576 | kfree(sbi->id_table); |
577 | kfree(sbi->fragment_index); | |
578 | kfree(sbi->meta_index); | |
370ec3d1 | 579 | kfree(sbi->inode_lookup_table); |
4b5397dc | 580 | kfree(sbi->xattr_id_table); |
0aa66619 PL |
581 | kfree(sb->s_fs_info); |
582 | sb->s_fs_info = NULL; | |
583 | } | |
584 | } | |
585 | ||
0aa66619 PL |
586 | static struct kmem_cache *squashfs_inode_cachep; |
587 | ||
588 | ||
589 | static void init_once(void *foo) | |
590 | { | |
591 | struct squashfs_inode_info *ei = foo; | |
592 | ||
593 | inode_init_once(&ei->vfs_inode); | |
594 | } | |
595 | ||
596 | ||
597 | static int __init init_inodecache(void) | |
598 | { | |
599 | squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | |
600 | sizeof(struct squashfs_inode_info), 0, | |
5d097056 VD |
601 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
602 | init_once); | |
0aa66619 PL |
603 | |
604 | return squashfs_inode_cachep ? 0 : -ENOMEM; | |
605 | } | |
606 | ||
607 | ||
608 | static void destroy_inodecache(void) | |
609 | { | |
8c0a8537 KS |
610 | /* |
611 | * Make sure all delayed rcu free inodes are flushed before we | |
612 | * destroy cache. | |
613 | */ | |
614 | rcu_barrier(); | |
0aa66619 PL |
615 | kmem_cache_destroy(squashfs_inode_cachep); |
616 | } | |
617 | ||
618 | ||
619 | static int __init init_squashfs_fs(void) | |
620 | { | |
621 | int err = init_inodecache(); | |
622 | ||
623 | if (err) | |
624 | return err; | |
625 | ||
626 | err = register_filesystem(&squashfs_fs_type); | |
627 | if (err) { | |
628 | destroy_inodecache(); | |
629 | return err; | |
630 | } | |
631 | ||
c811f5f4 | 632 | pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); |
0aa66619 PL |
633 | |
634 | return 0; | |
635 | } | |
636 | ||
637 | ||
638 | static void __exit exit_squashfs_fs(void) | |
639 | { | |
640 | unregister_filesystem(&squashfs_fs_type); | |
641 | destroy_inodecache(); | |
642 | } | |
643 | ||
644 | ||
645 | static struct inode *squashfs_alloc_inode(struct super_block *sb) | |
646 | { | |
647 | struct squashfs_inode_info *ei = | |
fd60b288 | 648 | alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL); |
0aa66619 PL |
649 | |
650 | return ei ? &ei->vfs_inode : NULL; | |
651 | } | |
652 | ||
653 | ||
56b5af19 | 654 | static void squashfs_free_inode(struct inode *inode) |
0aa66619 PL |
655 | { |
656 | kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); | |
657 | } | |
658 | ||
0aa66619 PL |
659 | static struct file_system_type squashfs_fs_type = { |
660 | .owner = THIS_MODULE, | |
661 | .name = "squashfs", | |
5a2be128 | 662 | .init_fs_context = squashfs_init_fs_context, |
10dde05b | 663 | .parameters = squashfs_fs_parameters, |
0aa66619 | 664 | .kill_sb = kill_block_super, |
42da66ac | 665 | .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, |
0aa66619 | 666 | }; |
3e64fe5b | 667 | MODULE_ALIAS_FS("squashfs"); |
0aa66619 | 668 | |
b87221de | 669 | static const struct super_operations squashfs_super_ops = { |
0aa66619 | 670 | .alloc_inode = squashfs_alloc_inode, |
56b5af19 | 671 | .free_inode = squashfs_free_inode, |
0aa66619 PL |
672 | .statfs = squashfs_statfs, |
673 | .put_super = squashfs_put_super, | |
10dde05b | 674 | .show_options = squashfs_show_options, |
0aa66619 PL |
675 | }; |
676 | ||
677 | module_init(init_squashfs_fs); | |
678 | module_exit(exit_squashfs_fs); | |
679 | MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); | |
d7f2ff67 | 680 | MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>"); |
0aa66619 | 681 | MODULE_LICENSE("GPL"); |