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; | |
200 | ||
10dde05b VW |
201 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); |
202 | ||
7657cacf | 203 | msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); |
0aa66619 PL |
204 | msblk->devblksize_log2 = ffz(~msblk->devblksize); |
205 | ||
0aa66619 PL |
206 | mutex_init(&msblk->meta_index_mutex); |
207 | ||
208 | /* | |
209 | * msblk->bytes_used is checked in squashfs_read_table to ensure reads | |
210 | * are not beyond filesystem end. But as we're using | |
211 | * squashfs_read_table here to read the superblock (including the value | |
212 | * of bytes_used) we need to set it to an initial sensible dummy value | |
213 | */ | |
214 | msblk->bytes_used = sizeof(*sblk); | |
82de647e | 215 | sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk)); |
0aa66619 | 216 | |
82de647e | 217 | if (IS_ERR(sblk)) { |
5a2be128 | 218 | errorf(fc, "unable to read squashfs_super_block"); |
82de647e PL |
219 | err = PTR_ERR(sblk); |
220 | sblk = NULL; | |
0aa66619 PL |
221 | goto failed_mount; |
222 | } | |
223 | ||
4c0f0bb2 PL |
224 | err = -EINVAL; |
225 | ||
0aa66619 PL |
226 | /* Check it is a SQUASHFS superblock */ |
227 | sb->s_magic = le32_to_cpu(sblk->s_magic); | |
228 | if (sb->s_magic != SQUASHFS_MAGIC) { | |
5a2be128 DH |
229 | if (!(fc->sb_flags & SB_SILENT)) |
230 | errorf(fc, "Can't find a SQUASHFS superblock on %pg", | |
231 | sb->s_bdev); | |
0aa66619 PL |
232 | goto failed_mount; |
233 | } | |
80f78409 | 234 | msblk->thread_ops = opts->thread_ops; |
fb40fe04 XN |
235 | if (opts->thread_num == 0) { |
236 | msblk->max_thread_num = msblk->thread_ops->max_decompressors(); | |
237 | } else { | |
238 | msblk->max_thread_num = opts->thread_num; | |
239 | } | |
0aa66619 | 240 | |
4c0f0bb2 PL |
241 | /* Check the MAJOR & MINOR versions and lookup compression type */ |
242 | msblk->decompressor = supported_squashfs_filesystem( | |
5a2be128 | 243 | fc, |
4c0f0bb2 | 244 | le16_to_cpu(sblk->s_major), |
0aa66619 PL |
245 | le16_to_cpu(sblk->s_minor), |
246 | le16_to_cpu(sblk->compression)); | |
4c0f0bb2 | 247 | if (msblk->decompressor == NULL) |
0aa66619 PL |
248 | goto failed_mount; |
249 | ||
0aa66619 PL |
250 | /* Check the filesystem does not extend beyond the end of the |
251 | block device */ | |
252 | msblk->bytes_used = le64_to_cpu(sblk->bytes_used); | |
be9a7b3e CH |
253 | if (msblk->bytes_used < 0 || |
254 | msblk->bytes_used > bdev_nr_bytes(sb->s_bdev)) | |
0aa66619 PL |
255 | goto failed_mount; |
256 | ||
257 | /* Check block size for sanity */ | |
258 | msblk->block_size = le32_to_cpu(sblk->block_size); | |
259 | if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE) | |
5a2be128 | 260 | goto insanity; |
0aa66619 | 261 | |
fffb47b8 PL |
262 | /* |
263 | * Check the system page size is not larger than the filesystem | |
264 | * block size (by default 128K). This is currently not supported. | |
265 | */ | |
09cbfeaf | 266 | if (PAGE_SIZE > msblk->block_size) { |
5a2be128 DH |
267 | errorf(fc, "Page size > filesystem block size (%d). This is " |
268 | "currently not supported!", msblk->block_size); | |
fffb47b8 PL |
269 | goto failed_mount; |
270 | } | |
271 | ||
4b0180a4 | 272 | /* Check block log for sanity */ |
0aa66619 PL |
273 | msblk->block_log = le16_to_cpu(sblk->block_log); |
274 | if (msblk->block_log > SQUASHFS_FILE_MAX_LOG) | |
275 | goto failed_mount; | |
276 | ||
4b0180a4 PL |
277 | /* Check that block_size and block_log match */ |
278 | if (msblk->block_size != (1 << msblk->block_log)) | |
5a2be128 | 279 | goto insanity; |
4b0180a4 | 280 | |
0aa66619 PL |
281 | /* Check the root inode for sanity */ |
282 | root_inode = le64_to_cpu(sblk->root_inode); | |
283 | if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE) | |
5a2be128 | 284 | goto insanity; |
0aa66619 PL |
285 | |
286 | msblk->inode_table = le64_to_cpu(sblk->inode_table_start); | |
287 | msblk->directory_table = le64_to_cpu(sblk->directory_table_start); | |
288 | msblk->inodes = le32_to_cpu(sblk->inodes); | |
71755ee5 | 289 | msblk->fragments = le32_to_cpu(sblk->fragments); |
f37aa4c7 | 290 | msblk->ids = le16_to_cpu(sblk->no_ids); |
0aa66619 PL |
291 | flags = le16_to_cpu(sblk->flags); |
292 | ||
a1c6f057 | 293 | TRACE("Found valid superblock on %pg\n", sb->s_bdev); |
0aa66619 PL |
294 | TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags) |
295 | ? "un" : ""); | |
296 | TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags) | |
297 | ? "un" : ""); | |
298 | TRACE("Filesystem size %lld bytes\n", msblk->bytes_used); | |
299 | TRACE("Block size %d\n", msblk->block_size); | |
300 | TRACE("Number of inodes %d\n", msblk->inodes); | |
71755ee5 | 301 | TRACE("Number of fragments %d\n", msblk->fragments); |
f37aa4c7 | 302 | TRACE("Number of ids %d\n", msblk->ids); |
0aa66619 PL |
303 | TRACE("sblk->inode_table_start %llx\n", msblk->inode_table); |
304 | TRACE("sblk->directory_table_start %llx\n", msblk->directory_table); | |
305 | TRACE("sblk->fragment_table_start %llx\n", | |
306 | (u64) le64_to_cpu(sblk->fragment_table_start)); | |
307 | TRACE("sblk->id_table_start %llx\n", | |
308 | (u64) le64_to_cpu(sblk->id_table_start)); | |
309 | ||
310 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
22b13969 DD |
311 | sb->s_time_min = 0; |
312 | sb->s_time_max = U32_MAX; | |
1751e8a6 | 313 | sb->s_flags |= SB_RDONLY; |
0aa66619 PL |
314 | sb->s_op = &squashfs_super_ops; |
315 | ||
316 | err = -ENOMEM; | |
317 | ||
318 | msblk->block_cache = squashfs_cache_init("metadata", | |
319 | SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); | |
320 | if (msblk->block_cache == NULL) | |
321 | goto failed_mount; | |
322 | ||
323 | /* Allocate read_page block */ | |
9508c6b9 | 324 | msblk->read_page = squashfs_cache_init("data", |
fb40fe04 | 325 | msblk->max_thread_num, msblk->block_size); |
0aa66619 | 326 | if (msblk->read_page == NULL) { |
5a2be128 | 327 | errorf(fc, "Failed to allocate read_page block"); |
0aa66619 PL |
328 | goto failed_mount; |
329 | } | |
330 | ||
9508c6b9 | 331 | msblk->stream = squashfs_decompressor_setup(sb, flags); |
b7fc0ff0 PL |
332 | if (IS_ERR(msblk->stream)) { |
333 | err = PTR_ERR(msblk->stream); | |
334 | msblk->stream = NULL; | |
5a2be128 | 335 | goto insanity; |
b7fc0ff0 PL |
336 | } |
337 | ||
76e002f7 PL |
338 | /* Handle xattrs */ |
339 | sb->s_xattr = squashfs_xattr_handlers; | |
340 | xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); | |
37986f63 PL |
341 | if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { |
342 | next_table = msblk->bytes_used; | |
76e002f7 | 343 | goto allocate_id_index_table; |
37986f63 | 344 | } |
76e002f7 PL |
345 | |
346 | /* Allocate and read xattr id lookup table */ | |
347 | msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, | |
348 | xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); | |
349 | if (IS_ERR(msblk->xattr_id_table)) { | |
5a2be128 | 350 | errorf(fc, "unable to read xattr id index table"); |
76e002f7 PL |
351 | err = PTR_ERR(msblk->xattr_id_table); |
352 | msblk->xattr_id_table = NULL; | |
353 | if (err != -ENOTSUPP) | |
354 | goto failed_mount; | |
355 | } | |
37986f63 | 356 | next_table = msblk->xattr_table; |
76e002f7 PL |
357 | |
358 | allocate_id_index_table: | |
0aa66619 PL |
359 | /* Allocate and read id index table */ |
360 | msblk->id_table = squashfs_read_id_index_table(sb, | |
f37aa4c7 | 361 | le64_to_cpu(sblk->id_table_start), next_table, msblk->ids); |
0aa66619 | 362 | if (IS_ERR(msblk->id_table)) { |
5a2be128 | 363 | errorf(fc, "unable to read id index table"); |
0aa66619 PL |
364 | err = PTR_ERR(msblk->id_table); |
365 | msblk->id_table = NULL; | |
366 | goto failed_mount; | |
367 | } | |
d5b72ce1 | 368 | next_table = le64_to_cpu(msblk->id_table[0]); |
0aa66619 | 369 | |
76e002f7 PL |
370 | /* Handle inode lookup table */ |
371 | lookup_table_start = le64_to_cpu(sblk->lookup_table_start); | |
372 | if (lookup_table_start == SQUASHFS_INVALID_BLK) | |
373 | goto handle_fragments; | |
374 | ||
375 | /* Allocate and read inode lookup table */ | |
376 | msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, | |
ac51a0a7 | 377 | lookup_table_start, next_table, msblk->inodes); |
76e002f7 | 378 | if (IS_ERR(msblk->inode_lookup_table)) { |
5a2be128 | 379 | errorf(fc, "unable to read inode lookup table"); |
76e002f7 PL |
380 | err = PTR_ERR(msblk->inode_lookup_table); |
381 | msblk->inode_lookup_table = NULL; | |
382 | goto failed_mount; | |
383 | } | |
d5b72ce1 | 384 | next_table = le64_to_cpu(msblk->inode_lookup_table[0]); |
76e002f7 PL |
385 | |
386 | sb->s_export_op = &squashfs_export_ops; | |
387 | ||
388 | handle_fragments: | |
71755ee5 | 389 | fragments = msblk->fragments; |
0aa66619 | 390 | if (fragments == 0) |
1094a4a6 | 391 | goto check_directory_table; |
0aa66619 PL |
392 | |
393 | msblk->fragment_cache = squashfs_cache_init("fragment", | |
394 | SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); | |
395 | if (msblk->fragment_cache == NULL) { | |
396 | err = -ENOMEM; | |
397 | goto failed_mount; | |
398 | } | |
399 | ||
400 | /* Allocate and read fragment index table */ | |
401 | msblk->fragment_index = squashfs_read_fragment_index_table(sb, | |
1cac63cc | 402 | le64_to_cpu(sblk->fragment_table_start), next_table, fragments); |
0aa66619 | 403 | if (IS_ERR(msblk->fragment_index)) { |
5a2be128 | 404 | errorf(fc, "unable to read fragment index table"); |
0aa66619 PL |
405 | err = PTR_ERR(msblk->fragment_index); |
406 | msblk->fragment_index = NULL; | |
407 | goto failed_mount; | |
408 | } | |
d5b72ce1 | 409 | next_table = le64_to_cpu(msblk->fragment_index[0]); |
0aa66619 | 410 | |
1094a4a6 PL |
411 | check_directory_table: |
412 | /* Sanity check directory_table */ | |
cc37f75a | 413 | if (msblk->directory_table > next_table) { |
1094a4a6 | 414 | err = -EINVAL; |
5a2be128 | 415 | goto insanity; |
1094a4a6 PL |
416 | } |
417 | ||
418 | /* Sanity check inode_table */ | |
419 | if (msblk->inode_table >= msblk->directory_table) { | |
420 | err = -EINVAL; | |
5a2be128 | 421 | goto insanity; |
1094a4a6 PL |
422 | } |
423 | ||
424 | /* allocate root */ | |
0aa66619 PL |
425 | root = new_inode(sb); |
426 | if (!root) { | |
427 | err = -ENOMEM; | |
428 | goto failed_mount; | |
429 | } | |
430 | ||
431 | err = squashfs_read_inode(root, root_inode); | |
432 | if (err) { | |
1cb08e97 PL |
433 | make_bad_inode(root); |
434 | iput(root); | |
0aa66619 PL |
435 | goto failed_mount; |
436 | } | |
437 | insert_inode_hash(root); | |
438 | ||
48fde701 | 439 | sb->s_root = d_make_root(root); |
0aa66619 PL |
440 | if (sb->s_root == NULL) { |
441 | ERROR("Root inode create failed\n"); | |
442 | err = -ENOMEM; | |
0aa66619 PL |
443 | goto failed_mount; |
444 | } | |
445 | ||
446 | TRACE("Leaving squashfs_fill_super\n"); | |
447 | kfree(sblk); | |
448 | return 0; | |
449 | ||
5a2be128 DH |
450 | insanity: |
451 | errorf(fc, "squashfs image failed sanity check"); | |
0aa66619 PL |
452 | failed_mount: |
453 | squashfs_cache_delete(msblk->block_cache); | |
454 | squashfs_cache_delete(msblk->fragment_cache); | |
455 | squashfs_cache_delete(msblk->read_page); | |
80f78409 | 456 | msblk->thread_ops->destroy(msblk); |
0aa66619 PL |
457 | kfree(msblk->inode_lookup_table); |
458 | kfree(msblk->fragment_index); | |
459 | kfree(msblk->id_table); | |
4b5397dc | 460 | kfree(msblk->xattr_id_table); |
0aa66619 PL |
461 | kfree(sb->s_fs_info); |
462 | sb->s_fs_info = NULL; | |
463 | kfree(sblk); | |
464 | return err; | |
0aa66619 PL |
465 | } |
466 | ||
5a2be128 DH |
467 | static int squashfs_get_tree(struct fs_context *fc) |
468 | { | |
469 | return get_tree_bdev(fc, squashfs_fill_super); | |
470 | } | |
471 | ||
472 | static int squashfs_reconfigure(struct fs_context *fc) | |
473 | { | |
10dde05b VW |
474 | struct super_block *sb = fc->root->d_sb; |
475 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
476 | struct squashfs_mount_opts *opts = fc->fs_private; | |
477 | ||
5a2be128 DH |
478 | sync_filesystem(fc->root->d_sb); |
479 | fc->sb_flags |= SB_RDONLY; | |
10dde05b VW |
480 | |
481 | msblk->panic_on_errors = (opts->errors == Opt_errors_panic); | |
482 | ||
5a2be128 DH |
483 | return 0; |
484 | } | |
485 | ||
10dde05b VW |
486 | static void squashfs_free_fs_context(struct fs_context *fc) |
487 | { | |
488 | kfree(fc->fs_private); | |
489 | } | |
490 | ||
5a2be128 DH |
491 | static const struct fs_context_operations squashfs_context_ops = { |
492 | .get_tree = squashfs_get_tree, | |
10dde05b VW |
493 | .free = squashfs_free_fs_context, |
494 | .parse_param = squashfs_parse_param, | |
5a2be128 DH |
495 | .reconfigure = squashfs_reconfigure, |
496 | }; | |
497 | ||
10dde05b VW |
498 | static int squashfs_show_options(struct seq_file *s, struct dentry *root) |
499 | { | |
500 | struct super_block *sb = root->d_sb; | |
501 | struct squashfs_sb_info *msblk = sb->s_fs_info; | |
502 | ||
503 | if (msblk->panic_on_errors) | |
504 | seq_puts(s, ",errors=panic"); | |
505 | else | |
506 | seq_puts(s, ",errors=continue"); | |
507 | ||
80f78409 XN |
508 | #ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT |
509 | if (msblk->thread_ops == &squashfs_decompressor_single) { | |
510 | seq_puts(s, ",threads=single"); | |
511 | return 0; | |
512 | } | |
80f78409 XN |
513 | if (msblk->thread_ops == &squashfs_decompressor_percpu) { |
514 | seq_puts(s, ",threads=percpu"); | |
515 | return 0; | |
516 | } | |
fb40fe04 XN |
517 | #endif |
518 | #ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS | |
519 | seq_printf(s, ",threads=%d", msblk->max_thread_num); | |
80f78409 | 520 | #endif |
10dde05b VW |
521 | return 0; |
522 | } | |
523 | ||
5a2be128 DH |
524 | static int squashfs_init_fs_context(struct fs_context *fc) |
525 | { | |
10dde05b VW |
526 | struct squashfs_mount_opts *opts; |
527 | ||
528 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
529 | if (!opts) | |
530 | return -ENOMEM; | |
531 | ||
80f78409 XN |
532 | #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE |
533 | opts->thread_ops = &squashfs_decompressor_single; | |
534 | #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI) | |
535 | opts->thread_ops = &squashfs_decompressor_multi; | |
536 | #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU) | |
537 | opts->thread_ops = &squashfs_decompressor_percpu; | |
538 | #else | |
539 | #error "fail: unknown squashfs decompression thread mode?" | |
540 | #endif | |
fb40fe04 | 541 | opts->thread_num = 0; |
10dde05b | 542 | fc->fs_private = opts; |
5a2be128 DH |
543 | fc->ops = &squashfs_context_ops; |
544 | return 0; | |
545 | } | |
0aa66619 PL |
546 | |
547 | static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
548 | { | |
549 | struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | |
2fc7f562 | 550 | u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); |
0aa66619 PL |
551 | |
552 | TRACE("Entered squashfs_statfs\n"); | |
553 | ||
554 | buf->f_type = SQUASHFS_MAGIC; | |
555 | buf->f_bsize = msblk->block_size; | |
556 | buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; | |
557 | buf->f_bfree = buf->f_bavail = 0; | |
558 | buf->f_files = msblk->inodes; | |
559 | buf->f_ffree = 0; | |
560 | buf->f_namelen = SQUASHFS_NAME_LEN; | |
6d1349c7 | 561 | buf->f_fsid = u64_to_fsid(id); |
0aa66619 PL |
562 | |
563 | return 0; | |
564 | } | |
565 | ||
566 | ||
0aa66619 PL |
567 | static void squashfs_put_super(struct super_block *sb) |
568 | { | |
569 | if (sb->s_fs_info) { | |
570 | struct squashfs_sb_info *sbi = sb->s_fs_info; | |
571 | squashfs_cache_delete(sbi->block_cache); | |
572 | squashfs_cache_delete(sbi->fragment_cache); | |
573 | squashfs_cache_delete(sbi->read_page); | |
80f78409 | 574 | sbi->thread_ops->destroy(sbi); |
0aa66619 PL |
575 | kfree(sbi->id_table); |
576 | kfree(sbi->fragment_index); | |
577 | kfree(sbi->meta_index); | |
370ec3d1 | 578 | kfree(sbi->inode_lookup_table); |
4b5397dc | 579 | kfree(sbi->xattr_id_table); |
0aa66619 PL |
580 | kfree(sb->s_fs_info); |
581 | sb->s_fs_info = NULL; | |
582 | } | |
583 | } | |
584 | ||
0aa66619 PL |
585 | static struct kmem_cache *squashfs_inode_cachep; |
586 | ||
587 | ||
588 | static void init_once(void *foo) | |
589 | { | |
590 | struct squashfs_inode_info *ei = foo; | |
591 | ||
592 | inode_init_once(&ei->vfs_inode); | |
593 | } | |
594 | ||
595 | ||
596 | static int __init init_inodecache(void) | |
597 | { | |
598 | squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | |
599 | sizeof(struct squashfs_inode_info), 0, | |
5d097056 VD |
600 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, |
601 | init_once); | |
0aa66619 PL |
602 | |
603 | return squashfs_inode_cachep ? 0 : -ENOMEM; | |
604 | } | |
605 | ||
606 | ||
607 | static void destroy_inodecache(void) | |
608 | { | |
8c0a8537 KS |
609 | /* |
610 | * Make sure all delayed rcu free inodes are flushed before we | |
611 | * destroy cache. | |
612 | */ | |
613 | rcu_barrier(); | |
0aa66619 PL |
614 | kmem_cache_destroy(squashfs_inode_cachep); |
615 | } | |
616 | ||
617 | ||
618 | static int __init init_squashfs_fs(void) | |
619 | { | |
620 | int err = init_inodecache(); | |
621 | ||
622 | if (err) | |
623 | return err; | |
624 | ||
625 | err = register_filesystem(&squashfs_fs_type); | |
626 | if (err) { | |
627 | destroy_inodecache(); | |
628 | return err; | |
629 | } | |
630 | ||
c811f5f4 | 631 | pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); |
0aa66619 PL |
632 | |
633 | return 0; | |
634 | } | |
635 | ||
636 | ||
637 | static void __exit exit_squashfs_fs(void) | |
638 | { | |
639 | unregister_filesystem(&squashfs_fs_type); | |
640 | destroy_inodecache(); | |
641 | } | |
642 | ||
643 | ||
644 | static struct inode *squashfs_alloc_inode(struct super_block *sb) | |
645 | { | |
646 | struct squashfs_inode_info *ei = | |
fd60b288 | 647 | alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL); |
0aa66619 PL |
648 | |
649 | return ei ? &ei->vfs_inode : NULL; | |
650 | } | |
651 | ||
652 | ||
56b5af19 | 653 | static void squashfs_free_inode(struct inode *inode) |
0aa66619 PL |
654 | { |
655 | kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); | |
656 | } | |
657 | ||
0aa66619 PL |
658 | static struct file_system_type squashfs_fs_type = { |
659 | .owner = THIS_MODULE, | |
660 | .name = "squashfs", | |
5a2be128 | 661 | .init_fs_context = squashfs_init_fs_context, |
10dde05b | 662 | .parameters = squashfs_fs_parameters, |
0aa66619 PL |
663 | .kill_sb = kill_block_super, |
664 | .fs_flags = FS_REQUIRES_DEV | |
665 | }; | |
3e64fe5b | 666 | MODULE_ALIAS_FS("squashfs"); |
0aa66619 | 667 | |
b87221de | 668 | static const struct super_operations squashfs_super_ops = { |
0aa66619 | 669 | .alloc_inode = squashfs_alloc_inode, |
56b5af19 | 670 | .free_inode = squashfs_free_inode, |
0aa66619 PL |
671 | .statfs = squashfs_statfs, |
672 | .put_super = squashfs_put_super, | |
10dde05b | 673 | .show_options = squashfs_show_options, |
0aa66619 PL |
674 | }; |
675 | ||
676 | module_init(init_squashfs_fs); | |
677 | module_exit(exit_squashfs_fs); | |
678 | MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); | |
d7f2ff67 | 679 | MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>"); |
0aa66619 | 680 | MODULE_LICENSE("GPL"); |