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Commit | Line | Data |
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2cb7cef9 BS |
1 | From: Phillip Lougher <phillip.lougher@gmail.com> |
2 | Subject: squashfs v3.4 | |
3 | Patch-mainline: Who knows? | |
4 | ||
5 | This patch contains the SquashFS file system. | |
6 | ||
7 | Acked-by: Greg Kroah-Hartman <gregkh@suse.com> | |
8 | ||
9 | --- | |
10 | fs/Kconfig | 50 | |
11 | fs/Makefile | 1 | |
12 | fs/squashfs/Makefile | 7 | |
13 | fs/squashfs/inode.c | 2174 +++++++++++++++++++++++++++++++++++++++++ | |
14 | fs/squashfs/squashfs.h | 86 + | |
15 | fs/squashfs/squashfs2_0.c | 740 +++++++++++++ | |
16 | include/linux/squashfs_fs.h | 935 +++++++++++++++++ | |
17 | include/linux/squashfs_fs_i.h | 45 | |
18 | include/linux/squashfs_fs_sb.h | 79 + | |
19 | init/do_mounts_rd.c | 16 | |
20 | 10 files changed, 4133 insertions(+) | |
21 | ||
22 | --- a/fs/Kconfig | |
23 | +++ b/fs/Kconfig | |
24 | @@ -1391,6 +1391,56 @@ config CRAMFS | |
25 | ||
26 | If unsure, say N. | |
27 | ||
28 | +config SQUASHFS | |
29 | + tristate "SquashFS 3.4 - Squashed file system support" | |
30 | + select ZLIB_INFLATE | |
31 | + help | |
32 | + Saying Y here includes support for SquashFS 3.4 (a Compressed | |
33 | + Read-Only File System). Squashfs is a highly compressed read-only | |
34 | + filesystem for Linux. It uses zlib compression to compress both | |
35 | + files, inodes and directories. Inodes in the system are very small | |
36 | + and all blocks are packed to minimise data overhead. Block sizes | |
37 | + greater than 4K are supported up to a maximum of 1 Mbytes (default | |
38 | + block size 128K). SquashFS 3.3 supports 64 bit filesystems and files | |
39 | + (larger than 4GB), full uid/gid information, hard links and timestamps. | |
40 | + | |
41 | + Squashfs is intended for general read-only filesystem use, for | |
42 | + archival use (i.e. in cases where a .tar.gz file may be used), and in | |
43 | + embedded systems where low overhead is needed. Further information | |
44 | + and filesystem tools are available from http://squashfs.sourceforge.net. | |
45 | + | |
46 | + If you want to compile this as a module ( = code which can be | |
47 | + inserted in and removed from the running kernel whenever you want), | |
48 | + say M here and read <file:Documentation/modules.txt>. The module | |
49 | + will be called squashfs. Note that the root file system (the one | |
50 | + containing the directory /) cannot be compiled as a module. | |
51 | + | |
52 | + If unsure, say N. | |
53 | + | |
54 | +config SQUASHFS_EMBEDDED | |
55 | + | |
56 | + bool "Additional option for memory-constrained systems" | |
57 | + depends on SQUASHFS | |
58 | + default n | |
59 | + help | |
60 | + Saying Y here allows you to specify cache size. | |
61 | + | |
62 | + If unsure, say N. | |
63 | + | |
64 | +config SQUASHFS_FRAGMENT_CACHE_SIZE | |
65 | + int "Number of fragments cached" if SQUASHFS_EMBEDDED | |
66 | + depends on SQUASHFS | |
67 | + default "3" | |
68 | + help | |
69 | + By default SquashFS caches the last 3 fragments read from | |
70 | + the filesystem. Increasing this amount may mean SquashFS | |
71 | + has to re-read fragments less often from disk, at the expense | |
72 | + of extra system memory. Decreasing this amount will mean | |
73 | + SquashFS uses less memory at the expense of extra reads from disk. | |
74 | + | |
75 | + Note there must be at least one cached fragment. Anything | |
76 | + much more than three will probably not make much difference. | |
77 | + | |
78 | config VXFS_FS | |
79 | tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)" | |
80 | depends on BLOCK | |
81 | --- a/fs/Makefile | |
82 | +++ b/fs/Makefile | |
83 | @@ -77,6 +77,7 @@ obj-$(CONFIG_JBD) += jbd/ | |
84 | obj-$(CONFIG_JBD2) += jbd2/ | |
85 | obj-$(CONFIG_EXT2_FS) += ext2/ | |
86 | obj-$(CONFIG_CRAMFS) += cramfs/ | |
87 | +obj-$(CONFIG_SQUASHFS) += squashfs/ | |
88 | obj-y += ramfs/ | |
89 | obj-$(CONFIG_HUGETLBFS) += hugetlbfs/ | |
90 | obj-$(CONFIG_CODA_FS) += coda/ | |
91 | --- /dev/null | |
92 | +++ b/fs/squashfs/Makefile | |
93 | @@ -0,0 +1,7 @@ | |
94 | +# | |
95 | +# Makefile for the linux squashfs routines. | |
96 | +# | |
97 | + | |
98 | +obj-$(CONFIG_SQUASHFS) += squashfs.o | |
99 | +squashfs-y += inode.o | |
100 | +squashfs-y += squashfs2_0.o | |
101 | --- /dev/null | |
102 | +++ b/fs/squashfs/inode.c | |
103 | @@ -0,0 +1,2174 @@ | |
104 | +/* | |
105 | + * Squashfs - a compressed read only filesystem for Linux | |
106 | + * | |
107 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
108 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | |
109 | + * | |
110 | + * This program is free software; you can redistribute it and/or | |
111 | + * modify it under the terms of the GNU General Public License | |
112 | + * as published by the Free Software Foundation; either version 2, | |
113 | + * or (at your option) any later version. | |
114 | + * | |
115 | + * This program is distributed in the hope that it will be useful, | |
116 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
117 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
118 | + * GNU General Public License for more details. | |
119 | + * | |
120 | + * You should have received a copy of the GNU General Public License | |
121 | + * along with this program; if not, write to the Free Software | |
122 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
123 | + * | |
124 | + * inode.c | |
125 | + */ | |
126 | + | |
127 | +#include <linux/squashfs_fs.h> | |
128 | +#include <linux/module.h> | |
129 | +#include <linux/zlib.h> | |
130 | +#include <linux/fs.h> | |
131 | +#include <linux/squashfs_fs_sb.h> | |
132 | +#include <linux/squashfs_fs_i.h> | |
133 | +#include <linux/buffer_head.h> | |
134 | +#include <linux/vfs.h> | |
135 | +#include <linux/vmalloc.h> | |
136 | +#include <linux/spinlock.h> | |
137 | +#include <linux/smp_lock.h> | |
138 | +#include <linux/exportfs.h> | |
139 | +#include <linux/sched.h> | |
140 | + | |
141 | +#include "squashfs.h" | |
142 | + | |
143 | +static struct dentry *squashfs_fh_to_dentry(struct super_block *s, | |
144 | + struct fid *fid, int fh_len, int fh_type); | |
145 | +static struct dentry *squashfs_fh_to_parent(struct super_block *s, | |
146 | + struct fid *fid, int fh_len, int fh_type); | |
147 | +static struct dentry *squashfs_get_parent(struct dentry *child); | |
148 | +static int squashfs_read_inode(struct inode *i, squashfs_inode_t inode); | |
149 | +static int squashfs_statfs(struct dentry *, struct kstatfs *); | |
150 | +static int squashfs_symlink_readpage(struct file *file, struct page *page); | |
151 | +static long long read_blocklist(struct inode *inode, int index, | |
152 | + int readahead_blks, char *block_list, | |
153 | + unsigned short **block_p, unsigned int *bsize); | |
154 | +static int squashfs_readpage(struct file *file, struct page *page); | |
155 | +static int squashfs_readdir(struct file *, void *, filldir_t); | |
156 | +static struct dentry *squashfs_lookup(struct inode *, struct dentry *, | |
157 | + struct nameidata *); | |
158 | +static int squashfs_remount(struct super_block *s, int *flags, char *data); | |
159 | +static void squashfs_put_super(struct super_block *); | |
160 | +static int squashfs_get_sb(struct file_system_type *,int, const char *, void *, | |
161 | + struct vfsmount *); | |
162 | +static struct inode *squashfs_alloc_inode(struct super_block *sb); | |
163 | +static void squashfs_destroy_inode(struct inode *inode); | |
164 | +static int init_inodecache(void); | |
165 | +static void destroy_inodecache(void); | |
166 | + | |
167 | +static struct file_system_type squashfs_fs_type = { | |
168 | + .owner = THIS_MODULE, | |
169 | + .name = "squashfs", | |
170 | + .get_sb = squashfs_get_sb, | |
171 | + .kill_sb = kill_block_super, | |
172 | + .fs_flags = FS_REQUIRES_DEV | |
173 | +}; | |
174 | + | |
175 | +static const unsigned char squashfs_filetype_table[] = { | |
176 | + DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK | |
177 | +}; | |
178 | + | |
179 | +static struct super_operations squashfs_super_ops = { | |
180 | + .alloc_inode = squashfs_alloc_inode, | |
181 | + .destroy_inode = squashfs_destroy_inode, | |
182 | + .statfs = squashfs_statfs, | |
183 | + .put_super = squashfs_put_super, | |
184 | + .remount_fs = squashfs_remount | |
185 | +}; | |
186 | + | |
187 | +static struct export_operations squashfs_export_ops = { | |
188 | + .fh_to_dentry = squashfs_fh_to_dentry, | |
189 | + .fh_to_parent = squashfs_fh_to_parent, | |
190 | + .get_parent = squashfs_get_parent | |
191 | +}; | |
192 | + | |
193 | +SQSH_EXTERN const struct address_space_operations squashfs_symlink_aops = { | |
194 | + .readpage = squashfs_symlink_readpage | |
195 | +}; | |
196 | + | |
197 | +SQSH_EXTERN const struct address_space_operations squashfs_aops = { | |
198 | + .readpage = squashfs_readpage | |
199 | +}; | |
200 | + | |
201 | +static const struct file_operations squashfs_dir_ops = { | |
202 | + .read = generic_read_dir, | |
203 | + .readdir = squashfs_readdir | |
204 | +}; | |
205 | + | |
206 | +SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = { | |
207 | + .lookup = squashfs_lookup | |
208 | +}; | |
209 | + | |
210 | + | |
211 | +static struct buffer_head *get_block_length(struct super_block *s, | |
212 | + int *cur_index, int *offset, int *c_byte) | |
213 | +{ | |
214 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
215 | + unsigned short temp; | |
216 | + struct buffer_head *bh; | |
217 | + | |
218 | + if (!(bh = sb_bread(s, *cur_index))) | |
219 | + goto out; | |
220 | + | |
221 | + if (msblk->devblksize - *offset == 1) { | |
222 | + if (msblk->swap) | |
223 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | |
224 | + (bh->b_data + *offset)); | |
225 | + else | |
226 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | |
227 | + (bh->b_data + *offset)); | |
228 | + brelse(bh); | |
229 | + if (!(bh = sb_bread(s, ++(*cur_index)))) | |
230 | + goto out; | |
231 | + if (msblk->swap) | |
232 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | |
233 | + bh->b_data); | |
234 | + else | |
235 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | |
236 | + bh->b_data); | |
237 | + *c_byte = temp; | |
238 | + *offset = 1; | |
239 | + } else { | |
240 | + if (msblk->swap) { | |
241 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | |
242 | + (bh->b_data + *offset)); | |
243 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | |
244 | + (bh->b_data + *offset + 1)); | |
245 | + } else { | |
246 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | |
247 | + (bh->b_data + *offset)); | |
248 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | |
249 | + (bh->b_data + *offset + 1)); | |
250 | + } | |
251 | + *c_byte = temp; | |
252 | + *offset += 2; | |
253 | + } | |
254 | + | |
255 | + if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) { | |
256 | + if (*offset == msblk->devblksize) { | |
257 | + brelse(bh); | |
258 | + if (!(bh = sb_bread(s, ++(*cur_index)))) | |
259 | + goto out; | |
260 | + *offset = 0; | |
261 | + } | |
262 | + if (*((unsigned char *) (bh->b_data + *offset)) != | |
263 | + SQUASHFS_MARKER_BYTE) { | |
264 | + ERROR("Metadata block marker corrupt @ %x\n", | |
265 | + *cur_index); | |
266 | + brelse(bh); | |
267 | + goto out; | |
268 | + } | |
269 | + (*offset)++; | |
270 | + } | |
271 | + return bh; | |
272 | + | |
273 | +out: | |
274 | + return NULL; | |
275 | +} | |
276 | + | |
277 | + | |
278 | +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer, | |
279 | + long long index, unsigned int length, | |
280 | + long long *next_index, int srclength) | |
281 | +{ | |
282 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
283 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
284 | + struct buffer_head **bh; | |
285 | + unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1); | |
286 | + unsigned int cur_index = index >> msblk->devblksize_log2; | |
287 | + int bytes, avail_bytes, b = 0, k = 0; | |
288 | + unsigned int compressed; | |
289 | + unsigned int c_byte = length; | |
290 | + | |
291 | + bh = kmalloc(((sblk->block_size >> msblk->devblksize_log2) + 1) * | |
292 | + sizeof(struct buffer_head *), GFP_KERNEL); | |
293 | + if (bh == NULL) | |
294 | + goto read_failure; | |
295 | + | |
296 | + if (c_byte) { | |
297 | + bytes = -offset; | |
298 | + compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte); | |
299 | + c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte); | |
300 | + | |
301 | + TRACE("Block @ 0x%llx, %scompressed size %d, src size %d\n", index, | |
302 | + compressed ? "" : "un", (unsigned int) c_byte, srclength); | |
303 | + | |
304 | + if (c_byte > srclength || index < 0 || (index + c_byte) > sblk->bytes_used) | |
305 | + goto read_failure; | |
306 | + | |
307 | + for (b = 0; bytes < (int) c_byte; b++, cur_index++) { | |
308 | + bh[b] = sb_getblk(s, cur_index); | |
309 | + if (bh[b] == NULL) | |
310 | + goto block_release; | |
311 | + bytes += msblk->devblksize; | |
312 | + } | |
313 | + ll_rw_block(READ, b, bh); | |
314 | + } else { | |
315 | + if (index < 0 || (index + 2) > sblk->bytes_used) | |
316 | + goto read_failure; | |
317 | + | |
318 | + bh[0] = get_block_length(s, &cur_index, &offset, &c_byte); | |
319 | + if (bh[0] == NULL) | |
320 | + goto read_failure; | |
321 | + b = 1; | |
322 | + | |
323 | + bytes = msblk->devblksize - offset; | |
324 | + compressed = SQUASHFS_COMPRESSED(c_byte); | |
325 | + c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte); | |
326 | + | |
327 | + TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed | |
328 | + ? "" : "un", (unsigned int) c_byte); | |
329 | + | |
330 | + if (c_byte > srclength || (index + c_byte) > sblk->bytes_used) | |
331 | + goto block_release; | |
332 | + | |
333 | + for (; bytes < c_byte; b++) { | |
334 | + bh[b] = sb_getblk(s, ++cur_index); | |
335 | + if (bh[b] == NULL) | |
336 | + goto block_release; | |
337 | + bytes += msblk->devblksize; | |
338 | + } | |
339 | + ll_rw_block(READ, b - 1, bh + 1); | |
340 | + } | |
341 | + | |
342 | + if (compressed) { | |
343 | + int zlib_err = 0; | |
344 | + | |
345 | + /* | |
346 | + * uncompress block | |
347 | + */ | |
348 | + | |
349 | + mutex_lock(&msblk->read_data_mutex); | |
350 | + | |
351 | + msblk->stream.next_out = buffer; | |
352 | + msblk->stream.avail_out = srclength; | |
353 | + | |
354 | + for (bytes = 0; k < b; k++) { | |
355 | + avail_bytes = min(c_byte - bytes, msblk->devblksize - offset); | |
356 | + | |
357 | + wait_on_buffer(bh[k]); | |
358 | + if (!buffer_uptodate(bh[k])) | |
359 | + goto release_mutex; | |
360 | + | |
361 | + msblk->stream.next_in = bh[k]->b_data + offset; | |
362 | + msblk->stream.avail_in = avail_bytes; | |
363 | + | |
364 | + if (k == 0) { | |
365 | + zlib_err = zlib_inflateInit(&msblk->stream); | |
366 | + if (zlib_err != Z_OK) { | |
367 | + ERROR("zlib_inflateInit returned unexpected result 0x%x," | |
368 | + " srclength %d\n", zlib_err, srclength); | |
369 | + goto release_mutex; | |
370 | + } | |
371 | + | |
372 | + if (avail_bytes == 0) { | |
373 | + offset = 0; | |
374 | + brelse(bh[k]); | |
375 | + continue; | |
376 | + } | |
377 | + } | |
378 | + | |
379 | + zlib_err = zlib_inflate(&msblk->stream, Z_NO_FLUSH); | |
380 | + if (zlib_err != Z_OK && zlib_err != Z_STREAM_END) { | |
381 | + ERROR("zlib_inflate returned unexpected result 0x%x," | |
382 | + " srclength %d, avail_in %d, avail_out %d\n", zlib_err, | |
383 | + srclength, msblk->stream.avail_in, msblk->stream.avail_out); | |
384 | + goto release_mutex; | |
385 | + } | |
386 | + | |
387 | + bytes += avail_bytes; | |
388 | + offset = 0; | |
389 | + brelse(bh[k]); | |
390 | + } | |
391 | + | |
392 | + if (zlib_err != Z_STREAM_END) | |
393 | + goto release_mutex; | |
394 | + | |
395 | + zlib_err = zlib_inflateEnd(&msblk->stream); | |
396 | + if (zlib_err != Z_OK) { | |
397 | + ERROR("zlib_inflateEnd returned unexpected result 0x%x," | |
398 | + " srclength %d\n", zlib_err, srclength); | |
399 | + goto release_mutex; | |
400 | + } | |
401 | + bytes = msblk->stream.total_out; | |
402 | + mutex_unlock(&msblk->read_data_mutex); | |
403 | + } else { | |
404 | + int i; | |
405 | + | |
406 | + for(i = 0; i < b; i++) { | |
407 | + wait_on_buffer(bh[i]); | |
408 | + if (!buffer_uptodate(bh[i])) | |
409 | + goto block_release; | |
410 | + } | |
411 | + | |
412 | + for (bytes = 0; k < b; k++) { | |
413 | + avail_bytes = min(c_byte - bytes, msblk->devblksize - offset); | |
414 | + | |
415 | + memcpy(buffer + bytes, bh[k]->b_data + offset, avail_bytes); | |
416 | + bytes += avail_bytes; | |
417 | + offset = 0; | |
418 | + brelse(bh[k]); | |
419 | + } | |
420 | + } | |
421 | + | |
422 | + if (next_index) | |
423 | + *next_index = index + c_byte + (length ? 0 : | |
424 | + (SQUASHFS_CHECK_DATA(msblk->sblk.flags) ? 3 : 2)); | |
425 | + | |
426 | + kfree(bh); | |
427 | + return bytes; | |
428 | + | |
429 | +release_mutex: | |
430 | + mutex_unlock(&msblk->read_data_mutex); | |
431 | + | |
432 | +block_release: | |
433 | + for (; k < b; k++) | |
434 | + brelse(bh[k]); | |
435 | + | |
436 | +read_failure: | |
437 | + ERROR("sb_bread failed reading block 0x%x\n", cur_index); | |
438 | + kfree(bh); | |
439 | + return 0; | |
440 | +} | |
441 | + | |
442 | + | |
443 | +static struct squashfs_cache_entry *squashfs_cache_get(struct super_block *s, | |
444 | + struct squashfs_cache *cache, long long block, int length) | |
445 | +{ | |
446 | + int i, n; | |
447 | + struct squashfs_cache_entry *entry; | |
448 | + | |
449 | + spin_lock(&cache->lock); | |
450 | + | |
451 | + while (1) { | |
452 | + for (i = 0; i < cache->entries && cache->entry[i].block != block; i++); | |
453 | + | |
454 | + if (i == cache->entries) { | |
455 | + if (cache->unused_blks == 0) { | |
456 | + cache->waiting ++; | |
457 | + spin_unlock(&cache->lock); | |
458 | + wait_event(cache->wait_queue, cache->unused_blks); | |
459 | + spin_lock(&cache->lock); | |
460 | + cache->waiting --; | |
461 | + continue; | |
462 | + } | |
463 | + | |
464 | + i = cache->next_blk; | |
465 | + for (n = 0; n < cache->entries; n++) { | |
466 | + if (cache->entry[i].locked == 0) | |
467 | + break; | |
468 | + i = (i + 1) % cache->entries; | |
469 | + } | |
470 | + | |
471 | + cache->next_blk = (i + 1) % cache->entries; | |
472 | + entry = &cache->entry[i]; | |
473 | + | |
474 | + cache->unused_blks --; | |
475 | + entry->block = block; | |
476 | + entry->locked = 1; | |
477 | + entry->pending = 1; | |
478 | + entry->waiting = 0; | |
479 | + entry->error = 0; | |
480 | + spin_unlock(&cache->lock); | |
481 | + | |
482 | + entry->length = squashfs_read_data(s, entry->data, | |
483 | + block, length, &entry->next_index, cache->block_size); | |
484 | + | |
485 | + spin_lock(&cache->lock); | |
486 | + | |
487 | + if (entry->length == 0) | |
488 | + entry->error = 1; | |
489 | + | |
490 | + entry->pending = 0; | |
491 | + spin_unlock(&cache->lock); | |
492 | + if (entry->waiting) | |
493 | + wake_up_all(&entry->wait_queue); | |
494 | + goto out; | |
495 | + } | |
496 | + | |
497 | + entry = &cache->entry[i]; | |
498 | + if (entry->locked == 0) | |
499 | + cache->unused_blks --; | |
500 | + entry->locked++; | |
501 | + | |
502 | + if (entry->pending) { | |
503 | + entry->waiting ++; | |
504 | + spin_unlock(&cache->lock); | |
505 | + wait_event(entry->wait_queue, !entry->pending); | |
506 | + goto out; | |
507 | + } | |
508 | + | |
509 | + spin_unlock(&cache->lock); | |
510 | + goto out; | |
511 | + } | |
512 | + | |
513 | +out: | |
514 | + TRACE("Got %s %d, start block %lld, locked %d, error %d\n", i, | |
515 | + cache->name, entry->block, entry->locked, entry->error); | |
516 | + if (entry->error) | |
517 | + ERROR("Unable to read %s cache entry [%llx]\n", cache->name, block); | |
518 | + return entry; | |
519 | +} | |
520 | + | |
521 | + | |
522 | +static void squashfs_cache_put(struct squashfs_cache *cache, | |
523 | + struct squashfs_cache_entry *entry) | |
524 | +{ | |
525 | + spin_lock(&cache->lock); | |
526 | + entry->locked --; | |
527 | + if (entry->locked == 0) { | |
528 | + cache->unused_blks ++; | |
529 | + spin_unlock(&cache->lock); | |
530 | + if (cache->waiting) | |
531 | + wake_up(&cache->wait_queue); | |
532 | + } else | |
533 | + spin_unlock(&cache->lock); | |
534 | +} | |
535 | + | |
536 | + | |
537 | +static void squashfs_cache_delete(struct squashfs_cache *cache) | |
538 | +{ | |
539 | + int i; | |
540 | + | |
541 | + if (cache == NULL) | |
542 | + return; | |
543 | + | |
544 | + for (i = 0; i < cache->entries; i++) | |
545 | + if (cache->entry[i].data) { | |
546 | + if (cache->use_vmalloc) | |
547 | + vfree(cache->entry[i].data); | |
548 | + else | |
549 | + kfree(cache->entry[i].data); | |
550 | + } | |
551 | + | |
552 | + kfree(cache); | |
553 | +} | |
554 | + | |
555 | + | |
556 | +static struct squashfs_cache *squashfs_cache_init(char *name, int entries, | |
557 | + int block_size, int use_vmalloc) | |
558 | +{ | |
559 | + int i; | |
560 | + struct squashfs_cache *cache = kzalloc(sizeof(struct squashfs_cache) + | |
561 | + entries * sizeof(struct squashfs_cache_entry), GFP_KERNEL); | |
562 | + if (cache == NULL) { | |
563 | + ERROR("Failed to allocate %s cache\n", name); | |
564 | + goto failed; | |
565 | + } | |
566 | + | |
567 | + cache->next_blk = 0; | |
568 | + cache->unused_blks = entries; | |
569 | + cache->entries = entries; | |
570 | + cache->block_size = block_size; | |
571 | + cache->use_vmalloc = use_vmalloc; | |
572 | + cache->name = name; | |
573 | + cache->waiting = 0; | |
574 | + spin_lock_init(&cache->lock); | |
575 | + init_waitqueue_head(&cache->wait_queue); | |
576 | + | |
577 | + for (i = 0; i < entries; i++) { | |
578 | + init_waitqueue_head(&cache->entry[i].wait_queue); | |
579 | + cache->entry[i].block = SQUASHFS_INVALID_BLK; | |
580 | + cache->entry[i].data = use_vmalloc ? vmalloc(block_size) : | |
581 | + kmalloc(block_size, GFP_KERNEL); | |
582 | + if (cache->entry[i].data == NULL) { | |
583 | + ERROR("Failed to allocate %s cache entry\n", name); | |
584 | + goto cleanup; | |
585 | + } | |
586 | + } | |
587 | + | |
588 | + return cache; | |
589 | + | |
590 | +cleanup: | |
591 | + squashfs_cache_delete(cache); | |
592 | +failed: | |
593 | + return NULL; | |
594 | +} | |
595 | + | |
596 | + | |
597 | +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, void *buffer, | |
598 | + long long block, unsigned int offset, | |
599 | + int length, long long *next_block, | |
600 | + unsigned int *next_offset) | |
601 | +{ | |
602 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
603 | + int bytes, return_length = length; | |
604 | + struct squashfs_cache_entry *entry; | |
605 | + | |
606 | + TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset); | |
607 | + | |
608 | + while (1) { | |
609 | + entry = squashfs_cache_get(s, msblk->block_cache, block, 0); | |
610 | + bytes = entry->length - offset; | |
611 | + | |
612 | + if (entry->error || bytes < 1) { | |
613 | + return_length = 0; | |
614 | + goto finish; | |
615 | + } else if (bytes >= length) { | |
616 | + if (buffer) | |
617 | + memcpy(buffer, entry->data + offset, length); | |
618 | + if (entry->length - offset == length) { | |
619 | + *next_block = entry->next_index; | |
620 | + *next_offset = 0; | |
621 | + } else { | |
622 | + *next_block = block; | |
623 | + *next_offset = offset + length; | |
624 | + } | |
625 | + goto finish; | |
626 | + } else { | |
627 | + if (buffer) { | |
628 | + memcpy(buffer, entry->data + offset, bytes); | |
629 | + buffer = (char *) buffer + bytes; | |
630 | + } | |
631 | + block = entry->next_index; | |
632 | + squashfs_cache_put(msblk->block_cache, entry); | |
633 | + length -= bytes; | |
634 | + offset = 0; | |
635 | + } | |
636 | + } | |
637 | + | |
638 | +finish: | |
639 | + squashfs_cache_put(msblk->block_cache, entry); | |
640 | + return return_length; | |
641 | +} | |
642 | + | |
643 | + | |
644 | +static int get_fragment_location(struct super_block *s, unsigned int fragment, | |
645 | + long long *fragment_start_block, | |
646 | + unsigned int *fragment_size) | |
647 | +{ | |
648 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
649 | + long long start_block = | |
650 | + msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)]; | |
651 | + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment); | |
652 | + struct squashfs_fragment_entry fragment_entry; | |
653 | + | |
654 | + if (msblk->swap) { | |
655 | + struct squashfs_fragment_entry sfragment_entry; | |
656 | + | |
657 | + if (!squashfs_get_cached_block(s, &sfragment_entry, start_block, offset, | |
658 | + sizeof(sfragment_entry), &start_block, &offset)) | |
659 | + goto out; | |
660 | + SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry); | |
661 | + } else | |
662 | + if (!squashfs_get_cached_block(s, &fragment_entry, start_block, offset, | |
663 | + sizeof(fragment_entry), &start_block, &offset)) | |
664 | + goto out; | |
665 | + | |
666 | + *fragment_start_block = fragment_entry.start_block; | |
667 | + *fragment_size = fragment_entry.size; | |
668 | + | |
669 | + return 1; | |
670 | + | |
671 | +out: | |
672 | + return 0; | |
673 | +} | |
674 | + | |
675 | + | |
676 | +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, | |
677 | + struct squashfs_cache_entry *fragment) | |
678 | +{ | |
679 | + squashfs_cache_put(msblk->fragment_cache, fragment); | |
680 | +} | |
681 | + | |
682 | + | |
683 | +SQSH_EXTERN | |
684 | +struct squashfs_cache_entry *get_cached_fragment(struct super_block *s, | |
685 | + long long start_block, int length) | |
686 | +{ | |
687 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
688 | + | |
689 | + return squashfs_cache_get(s, msblk->fragment_cache, start_block, length); | |
690 | +} | |
691 | + | |
692 | + | |
693 | +static void squashfs_new_inode(struct squashfs_sb_info *msblk, struct inode *i, | |
694 | + struct squashfs_base_inode_header *inodeb) | |
695 | +{ | |
696 | + i->i_ino = inodeb->inode_number; | |
697 | + i->i_mtime.tv_sec = inodeb->mtime; | |
698 | + i->i_atime.tv_sec = inodeb->mtime; | |
699 | + i->i_ctime.tv_sec = inodeb->mtime; | |
700 | + i->i_uid = msblk->uid[inodeb->uid]; | |
701 | + i->i_mode = inodeb->mode; | |
702 | + i->i_size = 0; | |
703 | + | |
704 | + if (inodeb->guid == SQUASHFS_GUIDS) | |
705 | + i->i_gid = i->i_uid; | |
706 | + else | |
707 | + i->i_gid = msblk->guid[inodeb->guid]; | |
708 | +} | |
709 | + | |
710 | + | |
711 | +static squashfs_inode_t squashfs_inode_lookup(struct super_block *s, int ino) | |
712 | +{ | |
713 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
714 | + long long start = msblk->inode_lookup_table[SQUASHFS_LOOKUP_BLOCK(ino - 1)]; | |
715 | + int offset = SQUASHFS_LOOKUP_BLOCK_OFFSET(ino - 1); | |
716 | + squashfs_inode_t inode; | |
717 | + | |
718 | + TRACE("Entered squashfs_inode_lookup, inode_number = %d\n", ino); | |
719 | + | |
720 | + if (msblk->swap) { | |
721 | + squashfs_inode_t sinode; | |
722 | + | |
723 | + if (!squashfs_get_cached_block(s, &sinode, start, offset, | |
724 | + sizeof(sinode), &start, &offset)) | |
725 | + goto out; | |
726 | + SQUASHFS_SWAP_INODE_T((&inode), &sinode); | |
727 | + } else if (!squashfs_get_cached_block(s, &inode, start, offset, | |
728 | + sizeof(inode), &start, &offset)) | |
729 | + goto out; | |
730 | + | |
731 | + TRACE("squashfs_inode_lookup, inode = 0x%llx\n", inode); | |
732 | + | |
733 | + return inode; | |
734 | + | |
735 | +out: | |
736 | + return SQUASHFS_INVALID_BLK; | |
737 | +} | |
738 | + | |
739 | + | |
740 | + | |
741 | +static struct dentry *squashfs_export_iget(struct super_block *s, | |
742 | + unsigned int inode_number) | |
743 | +{ | |
744 | + squashfs_inode_t inode; | |
745 | + struct inode *i; | |
746 | + struct dentry *dentry; | |
747 | + | |
748 | + TRACE("Entered squashfs_export_iget\n"); | |
749 | + | |
750 | + inode = squashfs_inode_lookup(s, inode_number); | |
751 | + if(inode == SQUASHFS_INVALID_BLK) { | |
752 | + dentry = ERR_PTR(-ENOENT); | |
753 | + goto failure; | |
754 | + } | |
755 | + | |
756 | + i = squashfs_iget(s, inode, inode_number); | |
757 | + if(i == NULL) { | |
758 | + dentry = ERR_PTR(-EACCES); | |
759 | + goto failure; | |
760 | + } | |
761 | + | |
762 | + dentry = d_alloc_anon(i); | |
763 | + if (dentry == NULL) { | |
764 | + iput(i); | |
765 | + dentry = ERR_PTR(-ENOMEM); | |
766 | + } | |
767 | + | |
768 | +failure: | |
769 | + return dentry; | |
770 | +} | |
771 | + | |
772 | + | |
773 | +static struct dentry *squashfs_fh_to_dentry(struct super_block *s, | |
774 | + struct fid *fid, int fh_len, int fh_type) | |
775 | +{ | |
776 | + if((fh_type != FILEID_INO32_GEN && fh_type != FILEID_INO32_GEN_PARENT) || | |
777 | + fh_len < 2) | |
778 | + return NULL; | |
779 | + | |
780 | + return squashfs_export_iget(s, fid->i32.ino); | |
781 | +} | |
782 | + | |
783 | + | |
784 | +static struct dentry *squashfs_fh_to_parent(struct super_block *s, | |
785 | + struct fid *fid, int fh_len, int fh_type) | |
786 | +{ | |
787 | + if(fh_type != FILEID_INO32_GEN_PARENT || fh_len < 4) | |
788 | + return NULL; | |
789 | + | |
790 | + return squashfs_export_iget(s, fid->i32.parent_ino); | |
791 | +} | |
792 | + | |
793 | + | |
794 | +static struct dentry *squashfs_get_parent(struct dentry *child) | |
795 | +{ | |
796 | + struct inode *i = child->d_inode; | |
797 | + | |
798 | + TRACE("Entered squashfs_get_parent\n"); | |
799 | + | |
800 | + return squashfs_export_iget(i->i_sb, SQUASHFS_I(i)->u.s2.parent_inode); | |
801 | +} | |
802 | + | |
803 | + | |
804 | +SQSH_EXTERN struct inode *squashfs_iget(struct super_block *s, | |
805 | + squashfs_inode_t inode, unsigned int inode_number) | |
806 | +{ | |
807 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
808 | + struct inode *i = iget_locked(s, inode_number); | |
809 | + | |
810 | + TRACE("Entered squashfs_iget\n"); | |
811 | + | |
812 | + if(i && (i->i_state & I_NEW)) { | |
813 | + (msblk->read_inode)(i, inode); | |
814 | + unlock_new_inode(i); | |
815 | + } | |
816 | + | |
817 | + return i; | |
818 | +} | |
819 | + | |
820 | + | |
821 | +static int squashfs_read_inode(struct inode *i, squashfs_inode_t inode) | |
822 | +{ | |
823 | + struct super_block *s = i->i_sb; | |
824 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
825 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
826 | + long long block = SQUASHFS_INODE_BLK(inode) + sblk->inode_table_start; | |
827 | + unsigned int offset = SQUASHFS_INODE_OFFSET(inode); | |
828 | + long long next_block; | |
829 | + unsigned int next_offset; | |
830 | + union squashfs_inode_header id, sid; | |
831 | + struct squashfs_base_inode_header *inodeb = &id.base, *sinodeb = &sid.base; | |
832 | + | |
833 | + TRACE("Entered squashfs_read_inode\n"); | |
834 | + | |
835 | + if (msblk->swap) { | |
836 | + if (!squashfs_get_cached_block(s, sinodeb, block, offset, | |
837 | + sizeof(*sinodeb), &next_block, &next_offset)) | |
838 | + goto failed_read; | |
839 | + SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb, sizeof(*sinodeb)); | |
840 | + } else | |
841 | + if (!squashfs_get_cached_block(s, inodeb, block, offset, | |
842 | + sizeof(*inodeb), &next_block, &next_offset)) | |
843 | + goto failed_read; | |
844 | + | |
845 | + squashfs_new_inode(msblk, i, inodeb); | |
846 | + | |
847 | + switch(inodeb->inode_type) { | |
848 | + case SQUASHFS_FILE_TYPE: { | |
849 | + unsigned int frag_size; | |
850 | + long long frag_blk; | |
851 | + struct squashfs_reg_inode_header *inodep = &id.reg; | |
852 | + struct squashfs_reg_inode_header *sinodep = &sid.reg; | |
853 | + | |
854 | + if (msblk->swap) { | |
855 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
856 | + sizeof(*sinodep), &next_block, &next_offset)) | |
857 | + goto failed_read; | |
858 | + SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep); | |
859 | + } else | |
860 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
861 | + sizeof(*inodep), &next_block, &next_offset)) | |
862 | + goto failed_read; | |
863 | + | |
864 | + frag_blk = SQUASHFS_INVALID_BLK; | |
865 | + | |
866 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG) | |
867 | + if(!get_fragment_location(s, inodep->fragment, &frag_blk, | |
868 | + &frag_size)) | |
869 | + goto failed_read; | |
870 | + | |
871 | + i->i_nlink = 1; | |
872 | + i->i_size = inodep->file_size; | |
873 | + i->i_fop = &generic_ro_fops; | |
874 | + i->i_mode |= S_IFREG; | |
875 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; | |
876 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; | |
877 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; | |
878 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; | |
879 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
880 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; | |
881 | + SQUASHFS_I(i)->offset = next_offset; | |
882 | + i->i_data.a_ops = &squashfs_aops; | |
883 | + | |
884 | + TRACE("File inode %x:%x, start_block %llx, " | |
885 | + "block_list_start %llx, offset %x\n", | |
886 | + SQUASHFS_INODE_BLK(inode), offset, | |
887 | + inodep->start_block, next_block, | |
888 | + next_offset); | |
889 | + break; | |
890 | + } | |
891 | + case SQUASHFS_LREG_TYPE: { | |
892 | + unsigned int frag_size; | |
893 | + long long frag_blk; | |
894 | + struct squashfs_lreg_inode_header *inodep = &id.lreg; | |
895 | + struct squashfs_lreg_inode_header *sinodep = &sid.lreg; | |
896 | + | |
897 | + if (msblk->swap) { | |
898 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
899 | + sizeof(*sinodep), &next_block, &next_offset)) | |
900 | + goto failed_read; | |
901 | + SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep); | |
902 | + } else | |
903 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
904 | + sizeof(*inodep), &next_block, &next_offset)) | |
905 | + goto failed_read; | |
906 | + | |
907 | + frag_blk = SQUASHFS_INVALID_BLK; | |
908 | + | |
909 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG) | |
910 | + if (!get_fragment_location(s, inodep->fragment, &frag_blk, | |
911 | + &frag_size)) | |
912 | + goto failed_read; | |
913 | + | |
914 | + i->i_nlink = inodep->nlink; | |
915 | + i->i_size = inodep->file_size; | |
916 | + i->i_fop = &generic_ro_fops; | |
917 | + i->i_mode |= S_IFREG; | |
918 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; | |
919 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; | |
920 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; | |
921 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; | |
922 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
923 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; | |
924 | + SQUASHFS_I(i)->offset = next_offset; | |
925 | + i->i_data.a_ops = &squashfs_aops; | |
926 | + | |
927 | + TRACE("File inode %x:%x, start_block %llx, " | |
928 | + "block_list_start %llx, offset %x\n", | |
929 | + SQUASHFS_INODE_BLK(inode), offset, | |
930 | + inodep->start_block, next_block, | |
931 | + next_offset); | |
932 | + break; | |
933 | + } | |
934 | + case SQUASHFS_DIR_TYPE: { | |
935 | + struct squashfs_dir_inode_header *inodep = &id.dir; | |
936 | + struct squashfs_dir_inode_header *sinodep = &sid.dir; | |
937 | + | |
938 | + if (msblk->swap) { | |
939 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
940 | + sizeof(*sinodep), &next_block, &next_offset)) | |
941 | + goto failed_read; | |
942 | + SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep); | |
943 | + } else | |
944 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
945 | + sizeof(*inodep), &next_block, &next_offset)) | |
946 | + goto failed_read; | |
947 | + | |
948 | + i->i_nlink = inodep->nlink; | |
949 | + i->i_size = inodep->file_size; | |
950 | + i->i_op = &squashfs_dir_inode_ops; | |
951 | + i->i_fop = &squashfs_dir_ops; | |
952 | + i->i_mode |= S_IFDIR; | |
953 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
954 | + SQUASHFS_I(i)->offset = inodep->offset; | |
955 | + SQUASHFS_I(i)->u.s2.directory_index_count = 0; | |
956 | + SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode; | |
957 | + | |
958 | + TRACE("Directory inode %x:%x, start_block %x, offset " | |
959 | + "%x\n", SQUASHFS_INODE_BLK(inode), | |
960 | + offset, inodep->start_block, | |
961 | + inodep->offset); | |
962 | + break; | |
963 | + } | |
964 | + case SQUASHFS_LDIR_TYPE: { | |
965 | + struct squashfs_ldir_inode_header *inodep = &id.ldir; | |
966 | + struct squashfs_ldir_inode_header *sinodep = &sid.ldir; | |
967 | + | |
968 | + if (msblk->swap) { | |
969 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
970 | + sizeof(*sinodep), &next_block, &next_offset)) | |
971 | + goto failed_read; | |
972 | + SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep, sinodep); | |
973 | + } else | |
974 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
975 | + sizeof(*inodep), &next_block, &next_offset)) | |
976 | + goto failed_read; | |
977 | + | |
978 | + i->i_nlink = inodep->nlink; | |
979 | + i->i_size = inodep->file_size; | |
980 | + i->i_op = &squashfs_dir_inode_ops; | |
981 | + i->i_fop = &squashfs_dir_ops; | |
982 | + i->i_mode |= S_IFDIR; | |
983 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
984 | + SQUASHFS_I(i)->offset = inodep->offset; | |
985 | + SQUASHFS_I(i)->u.s2.directory_index_start = next_block; | |
986 | + SQUASHFS_I(i)->u.s2.directory_index_offset = next_offset; | |
987 | + SQUASHFS_I(i)->u.s2.directory_index_count = inodep->i_count; | |
988 | + SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode; | |
989 | + | |
990 | + TRACE("Long directory inode %x:%x, start_block %x, offset %x\n", | |
991 | + SQUASHFS_INODE_BLK(inode), offset, | |
992 | + inodep->start_block, inodep->offset); | |
993 | + break; | |
994 | + } | |
995 | + case SQUASHFS_SYMLINK_TYPE: { | |
996 | + struct squashfs_symlink_inode_header *inodep = &id.symlink; | |
997 | + struct squashfs_symlink_inode_header *sinodep = &sid.symlink; | |
998 | + | |
999 | + if (msblk->swap) { | |
1000 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
1001 | + sizeof(*sinodep), &next_block, &next_offset)) | |
1002 | + goto failed_read; | |
1003 | + SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep, sinodep); | |
1004 | + } else | |
1005 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
1006 | + sizeof(*inodep), &next_block, &next_offset)) | |
1007 | + goto failed_read; | |
1008 | + | |
1009 | + i->i_nlink = inodep->nlink; | |
1010 | + i->i_size = inodep->symlink_size; | |
1011 | + i->i_op = &page_symlink_inode_operations; | |
1012 | + i->i_data.a_ops = &squashfs_symlink_aops; | |
1013 | + i->i_mode |= S_IFLNK; | |
1014 | + SQUASHFS_I(i)->start_block = next_block; | |
1015 | + SQUASHFS_I(i)->offset = next_offset; | |
1016 | + | |
1017 | + TRACE("Symbolic link inode %x:%x, start_block %llx, offset %x\n", | |
1018 | + SQUASHFS_INODE_BLK(inode), offset, | |
1019 | + next_block, next_offset); | |
1020 | + break; | |
1021 | + } | |
1022 | + case SQUASHFS_BLKDEV_TYPE: | |
1023 | + case SQUASHFS_CHRDEV_TYPE: { | |
1024 | + struct squashfs_dev_inode_header *inodep = &id.dev; | |
1025 | + struct squashfs_dev_inode_header *sinodep = &sid.dev; | |
1026 | + | |
1027 | + if (msblk->swap) { | |
1028 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
1029 | + sizeof(*sinodep), &next_block, &next_offset)) | |
1030 | + goto failed_read; | |
1031 | + SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep); | |
1032 | + } else | |
1033 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
1034 | + sizeof(*inodep), &next_block, &next_offset)) | |
1035 | + goto failed_read; | |
1036 | + | |
1037 | + i->i_nlink = inodep->nlink; | |
1038 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_CHRDEV_TYPE) ? | |
1039 | + S_IFCHR : S_IFBLK; | |
1040 | + init_special_inode(i, i->i_mode, old_decode_dev(inodep->rdev)); | |
1041 | + | |
1042 | + TRACE("Device inode %x:%x, rdev %x\n", | |
1043 | + SQUASHFS_INODE_BLK(inode), offset, inodep->rdev); | |
1044 | + break; | |
1045 | + } | |
1046 | + case SQUASHFS_FIFO_TYPE: | |
1047 | + case SQUASHFS_SOCKET_TYPE: { | |
1048 | + struct squashfs_ipc_inode_header *inodep = &id.ipc; | |
1049 | + struct squashfs_ipc_inode_header *sinodep = &sid.ipc; | |
1050 | + | |
1051 | + if (msblk->swap) { | |
1052 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | |
1053 | + sizeof(*sinodep), &next_block, &next_offset)) | |
1054 | + goto failed_read; | |
1055 | + SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep); | |
1056 | + } else | |
1057 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | |
1058 | + sizeof(*inodep), &next_block, &next_offset)) | |
1059 | + goto failed_read; | |
1060 | + | |
1061 | + i->i_nlink = inodep->nlink; | |
1062 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE) | |
1063 | + ? S_IFIFO : S_IFSOCK; | |
1064 | + init_special_inode(i, i->i_mode, 0); | |
1065 | + break; | |
1066 | + } | |
1067 | + default: | |
1068 | + ERROR("Unknown inode type %d in squashfs_iget!\n", | |
1069 | + inodeb->inode_type); | |
1070 | + goto failed_read1; | |
1071 | + } | |
1072 | + | |
1073 | + return 1; | |
1074 | + | |
1075 | +failed_read: | |
1076 | + ERROR("Unable to read inode [%llx:%x]\n", block, offset); | |
1077 | + | |
1078 | +failed_read1: | |
1079 | + make_bad_inode(i); | |
1080 | + return 0; | |
1081 | +} | |
1082 | + | |
1083 | + | |
1084 | +static int read_inode_lookup_table(struct super_block *s) | |
1085 | +{ | |
1086 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
1087 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1088 | + unsigned int length = SQUASHFS_LOOKUP_BLOCK_BYTES(sblk->inodes); | |
1089 | + | |
1090 | + TRACE("In read_inode_lookup_table, length %d\n", length); | |
1091 | + | |
1092 | + /* Allocate inode lookup table */ | |
1093 | + msblk->inode_lookup_table = kmalloc(length, GFP_KERNEL); | |
1094 | + if (msblk->inode_lookup_table == NULL) { | |
1095 | + ERROR("Failed to allocate inode lookup table\n"); | |
1096 | + return 0; | |
1097 | + } | |
1098 | + | |
1099 | + if (!squashfs_read_data(s, (char *) msblk->inode_lookup_table, | |
1100 | + sblk->lookup_table_start, length | | |
1101 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length)) { | |
1102 | + ERROR("unable to read inode lookup table\n"); | |
1103 | + return 0; | |
1104 | + } | |
1105 | + | |
1106 | + if (msblk->swap) { | |
1107 | + int i; | |
1108 | + long long block; | |
1109 | + | |
1110 | + for (i = 0; i < SQUASHFS_LOOKUP_BLOCKS(sblk->inodes); i++) { | |
1111 | + /* XXX */ | |
1112 | + SQUASHFS_SWAP_LOOKUP_BLOCKS((&block), | |
1113 | + &msblk->inode_lookup_table[i], 1); | |
1114 | + msblk->inode_lookup_table[i] = block; | |
1115 | + } | |
1116 | + } | |
1117 | + | |
1118 | + return 1; | |
1119 | +} | |
1120 | + | |
1121 | + | |
1122 | +static int read_fragment_index_table(struct super_block *s) | |
1123 | +{ | |
1124 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
1125 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1126 | + unsigned int length = SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments); | |
1127 | + | |
1128 | + if(length == 0) | |
1129 | + return 1; | |
1130 | + | |
1131 | + /* Allocate fragment index table */ | |
1132 | + msblk->fragment_index = kmalloc(length, GFP_KERNEL); | |
1133 | + if (msblk->fragment_index == NULL) { | |
1134 | + ERROR("Failed to allocate fragment index table\n"); | |
1135 | + return 0; | |
1136 | + } | |
1137 | + | |
1138 | + if (!squashfs_read_data(s, (char *) msblk->fragment_index, | |
1139 | + sblk->fragment_table_start, length | | |
1140 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length)) { | |
1141 | + ERROR("unable to read fragment index table\n"); | |
1142 | + return 0; | |
1143 | + } | |
1144 | + | |
1145 | + if (msblk->swap) { | |
1146 | + int i; | |
1147 | + long long fragment; | |
1148 | + | |
1149 | + for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments); i++) { | |
1150 | + /* XXX */ | |
1151 | + SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment), | |
1152 | + &msblk->fragment_index[i], 1); | |
1153 | + msblk->fragment_index[i] = fragment; | |
1154 | + } | |
1155 | + } | |
1156 | + | |
1157 | + return 1; | |
1158 | +} | |
1159 | + | |
1160 | + | |
1161 | +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent) | |
1162 | +{ | |
1163 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1164 | + | |
1165 | + msblk->read_inode = squashfs_read_inode; | |
1166 | + msblk->read_blocklist = read_blocklist; | |
1167 | + msblk->read_fragment_index_table = read_fragment_index_table; | |
1168 | + | |
1169 | + if (sblk->s_major == 1) { | |
1170 | + if (!squashfs_1_0_supported(msblk)) { | |
1171 | + SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems " | |
1172 | + "are unsupported\n"); | |
1173 | + SERROR("Please recompile with Squashfs 1.0 support enabled\n"); | |
1174 | + return 0; | |
1175 | + } | |
1176 | + } else if (sblk->s_major == 2) { | |
1177 | + if (!squashfs_2_0_supported(msblk)) { | |
1178 | + SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems " | |
1179 | + "are unsupported\n"); | |
1180 | + SERROR("Please recompile with Squashfs 2.0 support enabled\n"); | |
1181 | + return 0; | |
1182 | + } | |
1183 | + } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor > | |
1184 | + SQUASHFS_MINOR) { | |
1185 | + SERROR("Major/Minor mismatch, trying to mount newer %d.%d " | |
1186 | + "filesystem\n", sblk->s_major, sblk->s_minor); | |
1187 | + SERROR("Please update your kernel\n"); | |
1188 | + return 0; | |
1189 | + } | |
1190 | + | |
1191 | + return 1; | |
1192 | +} | |
1193 | + | |
1194 | + | |
1195 | +static int squashfs_fill_super(struct super_block *s, void *data, int silent) | |
1196 | +{ | |
1197 | + struct squashfs_sb_info *msblk; | |
1198 | + struct squashfs_super_block *sblk; | |
1199 | + char b[BDEVNAME_SIZE]; | |
1200 | + struct inode *root; | |
1201 | + | |
1202 | + TRACE("Entered squashfs_fill_superblock\n"); | |
1203 | + | |
1204 | + s->s_fs_info = kzalloc(sizeof(struct squashfs_sb_info), GFP_KERNEL); | |
1205 | + if (s->s_fs_info == NULL) { | |
1206 | + ERROR("Failed to allocate superblock\n"); | |
1207 | + goto failure; | |
1208 | + } | |
1209 | + msblk = s->s_fs_info; | |
1210 | + | |
1211 | + msblk->stream.workspace = vmalloc(zlib_inflate_workspacesize()); | |
1212 | + if (msblk->stream.workspace == NULL) { | |
1213 | + ERROR("Failed to allocate zlib workspace\n"); | |
1214 | + goto failure; | |
1215 | + } | |
1216 | + sblk = &msblk->sblk; | |
1217 | + | |
1218 | + msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE); | |
1219 | + msblk->devblksize_log2 = ffz(~msblk->devblksize); | |
1220 | + | |
1221 | + mutex_init(&msblk->read_data_mutex); | |
1222 | + mutex_init(&msblk->read_page_mutex); | |
1223 | + mutex_init(&msblk->meta_index_mutex); | |
1224 | + | |
1225 | + /* sblk->bytes_used is checked in squashfs_read_data to ensure reads are not | |
1226 | + * beyond filesystem end. As we're using squashfs_read_data to read sblk here, | |
1227 | + * first set sblk->bytes_used to a useful value */ | |
1228 | + sblk->bytes_used = sizeof(struct squashfs_super_block); | |
1229 | + if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START, | |
1230 | + sizeof(struct squashfs_super_block) | | |
1231 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, sizeof(struct squashfs_super_block))) { | |
1232 | + SERROR("unable to read superblock\n"); | |
1233 | + goto failed_mount; | |
1234 | + } | |
1235 | + | |
1236 | + /* Check it is a SQUASHFS superblock */ | |
1237 | + if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) { | |
1238 | + if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) { | |
1239 | + struct squashfs_super_block ssblk; | |
1240 | + | |
1241 | + WARNING("Mounting a different endian SQUASHFS filesystem on %s\n", | |
1242 | + bdevname(s->s_bdev, b)); | |
1243 | + | |
1244 | + SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk); | |
1245 | + memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block)); | |
1246 | + msblk->swap = 1; | |
1247 | + } else { | |
1248 | + SERROR("Can't find a SQUASHFS superblock on %s\n", | |
1249 | + bdevname(s->s_bdev, b)); | |
1250 | + goto failed_mount; | |
1251 | + } | |
1252 | + } | |
1253 | + | |
1254 | + /* Check the MAJOR & MINOR versions */ | |
1255 | + if(!supported_squashfs_filesystem(msblk, silent)) | |
1256 | + goto failed_mount; | |
1257 | + | |
1258 | + /* Check the filesystem does not extend beyond the end of the | |
1259 | + block device */ | |
1260 | + if(sblk->bytes_used < 0 || sblk->bytes_used > i_size_read(s->s_bdev->bd_inode)) | |
1261 | + goto failed_mount; | |
1262 | + | |
1263 | + /* Check the root inode for sanity */ | |
1264 | + if (SQUASHFS_INODE_OFFSET(sblk->root_inode) > SQUASHFS_METADATA_SIZE) | |
1265 | + goto failed_mount; | |
1266 | + | |
1267 | + TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b)); | |
1268 | + TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(sblk->flags) | |
1269 | + ? "un" : ""); | |
1270 | + TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(sblk->flags) | |
1271 | + ? "un" : ""); | |
1272 | + TRACE("Check data is %spresent in the filesystem\n", | |
1273 | + SQUASHFS_CHECK_DATA(sblk->flags) ? "" : "not "); | |
1274 | + TRACE("Filesystem size %lld bytes\n", sblk->bytes_used); | |
1275 | + TRACE("Block size %d\n", sblk->block_size); | |
1276 | + TRACE("Number of inodes %d\n", sblk->inodes); | |
1277 | + if (sblk->s_major > 1) | |
1278 | + TRACE("Number of fragments %d\n", sblk->fragments); | |
1279 | + TRACE("Number of uids %d\n", sblk->no_uids); | |
1280 | + TRACE("Number of gids %d\n", sblk->no_guids); | |
1281 | + TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start); | |
1282 | + TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start); | |
1283 | + if (sblk->s_major > 1) | |
1284 | + TRACE("sblk->fragment_table_start %llx\n", sblk->fragment_table_start); | |
1285 | + TRACE("sblk->uid_start %llx\n", sblk->uid_start); | |
1286 | + | |
1287 | + s->s_maxbytes = MAX_LFS_FILESIZE; | |
1288 | + s->s_flags |= MS_RDONLY; | |
1289 | + s->s_op = &squashfs_super_ops; | |
1290 | + | |
1291 | + msblk->block_cache = squashfs_cache_init("metadata", SQUASHFS_CACHED_BLKS, | |
1292 | + SQUASHFS_METADATA_SIZE, 0); | |
1293 | + if (msblk->block_cache == NULL) | |
1294 | + goto failed_mount; | |
1295 | + | |
1296 | + /* Allocate read_page block */ | |
1297 | + msblk->read_page = vmalloc(sblk->block_size); | |
1298 | + if (msblk->read_page == NULL) { | |
1299 | + ERROR("Failed to allocate read_page block\n"); | |
1300 | + goto failed_mount; | |
1301 | + } | |
1302 | + | |
1303 | + /* Allocate uid and gid tables */ | |
1304 | + msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) * | |
1305 | + sizeof(unsigned int), GFP_KERNEL); | |
1306 | + if (msblk->uid == NULL) { | |
1307 | + ERROR("Failed to allocate uid/gid table\n"); | |
1308 | + goto failed_mount; | |
1309 | + } | |
1310 | + msblk->guid = msblk->uid + sblk->no_uids; | |
1311 | + | |
1312 | + if (msblk->swap) { | |
1313 | + unsigned int suid[sblk->no_uids + sblk->no_guids]; | |
1314 | + | |
1315 | + if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start, | |
1316 | + ((sblk->no_uids + sblk->no_guids) * | |
1317 | + sizeof(unsigned int)) | | |
1318 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) { | |
1319 | + ERROR("unable to read uid/gid table\n"); | |
1320 | + goto failed_mount; | |
1321 | + } | |
1322 | + | |
1323 | + SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids + | |
1324 | + sblk->no_guids), (sizeof(unsigned int) * 8)); | |
1325 | + } else | |
1326 | + if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start, | |
1327 | + ((sblk->no_uids + sblk->no_guids) * | |
1328 | + sizeof(unsigned int)) | | |
1329 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) { | |
1330 | + ERROR("unable to read uid/gid table\n"); | |
1331 | + goto failed_mount; | |
1332 | + } | |
1333 | + | |
1334 | + | |
1335 | + if (sblk->s_major == 1 && squashfs_1_0_supported(msblk)) | |
1336 | + goto allocate_root; | |
1337 | + | |
1338 | + msblk->fragment_cache = squashfs_cache_init("fragment", | |
1339 | + SQUASHFS_CACHED_FRAGMENTS, sblk->block_size, 1); | |
1340 | + if (msblk->fragment_cache == NULL) | |
1341 | + goto failed_mount; | |
1342 | + | |
1343 | + /* Allocate and read fragment index table */ | |
1344 | + if (msblk->read_fragment_index_table(s) == 0) | |
1345 | + goto failed_mount; | |
1346 | + | |
1347 | + if(sblk->s_major < 3 || sblk->lookup_table_start == SQUASHFS_INVALID_BLK) | |
1348 | + goto allocate_root; | |
1349 | + | |
1350 | + /* Allocate and read inode lookup table */ | |
1351 | + if (read_inode_lookup_table(s) == 0) | |
1352 | + goto failed_mount; | |
1353 | + | |
1354 | + s->s_export_op = &squashfs_export_ops; | |
1355 | + | |
1356 | +allocate_root: | |
1357 | + root = new_inode(s); | |
1358 | + if ((msblk->read_inode)(root, sblk->root_inode) == 0) | |
1359 | + goto failed_mount; | |
1360 | + insert_inode_hash(root); | |
1361 | + | |
1362 | + s->s_root = d_alloc_root(root); | |
1363 | + if (s->s_root == NULL) { | |
1364 | + ERROR("Root inode create failed\n"); | |
1365 | + iput(root); | |
1366 | + goto failed_mount; | |
1367 | + } | |
1368 | + | |
1369 | + TRACE("Leaving squashfs_fill_super\n"); | |
1370 | + return 0; | |
1371 | + | |
1372 | +failed_mount: | |
1373 | + kfree(msblk->inode_lookup_table); | |
1374 | + kfree(msblk->fragment_index); | |
1375 | + squashfs_cache_delete(msblk->fragment_cache); | |
1376 | + kfree(msblk->uid); | |
1377 | + vfree(msblk->read_page); | |
1378 | + squashfs_cache_delete(msblk->block_cache); | |
1379 | + kfree(msblk->fragment_index_2); | |
1380 | + vfree(msblk->stream.workspace); | |
1381 | + kfree(s->s_fs_info); | |
1382 | + s->s_fs_info = NULL; | |
1383 | + return -EINVAL; | |
1384 | + | |
1385 | +failure: | |
1386 | + return -ENOMEM; | |
1387 | +} | |
1388 | + | |
1389 | + | |
1390 | +static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
1391 | +{ | |
1392 | + struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | |
1393 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1394 | + | |
1395 | + TRACE("Entered squashfs_statfs\n"); | |
1396 | + | |
1397 | + buf->f_type = SQUASHFS_MAGIC; | |
1398 | + buf->f_bsize = sblk->block_size; | |
1399 | + buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1; | |
1400 | + buf->f_bfree = buf->f_bavail = 0; | |
1401 | + buf->f_files = sblk->inodes; | |
1402 | + buf->f_ffree = 0; | |
1403 | + buf->f_namelen = SQUASHFS_NAME_LEN; | |
1404 | + | |
1405 | + return 0; | |
1406 | +} | |
1407 | + | |
1408 | + | |
1409 | +static int squashfs_symlink_readpage(struct file *file, struct page *page) | |
1410 | +{ | |
1411 | + struct inode *inode = page->mapping->host; | |
1412 | + int index = page->index << PAGE_CACHE_SHIFT, length, bytes, avail_bytes; | |
1413 | + long long block = SQUASHFS_I(inode)->start_block; | |
1414 | + int offset = SQUASHFS_I(inode)->offset; | |
1415 | + void *pageaddr = kmap(page); | |
1416 | + | |
1417 | + TRACE("Entered squashfs_symlink_readpage, page index %ld, start block " | |
1418 | + "%llx, offset %x\n", page->index, | |
1419 | + SQUASHFS_I(inode)->start_block, | |
1420 | + SQUASHFS_I(inode)->offset); | |
1421 | + | |
1422 | + for (length = 0; length < index; length += bytes) { | |
1423 | + bytes = squashfs_get_cached_block(inode->i_sb, NULL, block, | |
1424 | + offset, PAGE_CACHE_SIZE, &block, &offset); | |
1425 | + if (bytes == 0) { | |
1426 | + ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset); | |
1427 | + goto skip_read; | |
1428 | + } | |
1429 | + } | |
1430 | + | |
1431 | + if (length != index) { | |
1432 | + ERROR("(squashfs_symlink_readpage) length != index\n"); | |
1433 | + bytes = 0; | |
1434 | + goto skip_read; | |
1435 | + } | |
1436 | + | |
1437 | + avail_bytes = min_t(int, i_size_read(inode) - length, PAGE_CACHE_SIZE); | |
1438 | + | |
1439 | + bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block, offset, | |
1440 | + avail_bytes, &block, &offset); | |
1441 | + if (bytes == 0) | |
1442 | + ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset); | |
1443 | + | |
1444 | +skip_read: | |
1445 | + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); | |
1446 | + kunmap(page); | |
1447 | + flush_dcache_page(page); | |
1448 | + SetPageUptodate(page); | |
1449 | + unlock_page(page); | |
1450 | + | |
1451 | + return 0; | |
1452 | +} | |
1453 | + | |
1454 | + | |
1455 | +static struct meta_index *locate_meta_index(struct inode *inode, int index, int offset) | |
1456 | +{ | |
1457 | + struct meta_index *meta = NULL; | |
1458 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | |
1459 | + int i; | |
1460 | + | |
1461 | + mutex_lock(&msblk->meta_index_mutex); | |
1462 | + | |
1463 | + TRACE("locate_meta_index: index %d, offset %d\n", index, offset); | |
1464 | + | |
1465 | + if (msblk->meta_index == NULL) | |
1466 | + goto not_allocated; | |
1467 | + | |
1468 | + for (i = 0; i < SQUASHFS_META_NUMBER; i ++) { | |
1469 | + if (msblk->meta_index[i].inode_number == inode->i_ino && | |
1470 | + msblk->meta_index[i].offset >= offset && | |
1471 | + msblk->meta_index[i].offset <= index && | |
1472 | + msblk->meta_index[i].locked == 0) { | |
1473 | + TRACE("locate_meta_index: entry %d, offset %d\n", i, | |
1474 | + msblk->meta_index[i].offset); | |
1475 | + meta = &msblk->meta_index[i]; | |
1476 | + offset = meta->offset; | |
1477 | + } | |
1478 | + } | |
1479 | + | |
1480 | + if (meta) | |
1481 | + meta->locked = 1; | |
1482 | + | |
1483 | +not_allocated: | |
1484 | + mutex_unlock(&msblk->meta_index_mutex); | |
1485 | + | |
1486 | + return meta; | |
1487 | +} | |
1488 | + | |
1489 | + | |
1490 | +static struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip) | |
1491 | +{ | |
1492 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | |
1493 | + struct meta_index *meta = NULL; | |
1494 | + int i; | |
1495 | + | |
1496 | + mutex_lock(&msblk->meta_index_mutex); | |
1497 | + | |
1498 | + TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip); | |
1499 | + | |
1500 | + if (msblk->meta_index == NULL) { | |
1501 | + msblk->meta_index = kmalloc(sizeof(struct meta_index) * | |
1502 | + SQUASHFS_META_NUMBER, GFP_KERNEL); | |
1503 | + if (msblk->meta_index == NULL) { | |
1504 | + ERROR("Failed to allocate meta_index\n"); | |
1505 | + goto failed; | |
1506 | + } | |
1507 | + for (i = 0; i < SQUASHFS_META_NUMBER; i++) { | |
1508 | + msblk->meta_index[i].inode_number = 0; | |
1509 | + msblk->meta_index[i].locked = 0; | |
1510 | + } | |
1511 | + msblk->next_meta_index = 0; | |
1512 | + } | |
1513 | + | |
1514 | + for (i = SQUASHFS_META_NUMBER; i && | |
1515 | + msblk->meta_index[msblk->next_meta_index].locked; i --) | |
1516 | + msblk->next_meta_index = (msblk->next_meta_index + 1) % | |
1517 | + SQUASHFS_META_NUMBER; | |
1518 | + | |
1519 | + if (i == 0) { | |
1520 | + TRACE("empty_meta_index: failed!\n"); | |
1521 | + goto failed; | |
1522 | + } | |
1523 | + | |
1524 | + TRACE("empty_meta_index: returned meta entry %d, %p\n", | |
1525 | + msblk->next_meta_index, | |
1526 | + &msblk->meta_index[msblk->next_meta_index]); | |
1527 | + | |
1528 | + meta = &msblk->meta_index[msblk->next_meta_index]; | |
1529 | + msblk->next_meta_index = (msblk->next_meta_index + 1) % | |
1530 | + SQUASHFS_META_NUMBER; | |
1531 | + | |
1532 | + meta->inode_number = inode->i_ino; | |
1533 | + meta->offset = offset; | |
1534 | + meta->skip = skip; | |
1535 | + meta->entries = 0; | |
1536 | + meta->locked = 1; | |
1537 | + | |
1538 | +failed: | |
1539 | + mutex_unlock(&msblk->meta_index_mutex); | |
1540 | + return meta; | |
1541 | +} | |
1542 | + | |
1543 | + | |
1544 | +static void release_meta_index(struct inode *inode, struct meta_index *meta) | |
1545 | +{ | |
1546 | + meta->locked = 0; | |
1547 | + smp_mb(); | |
1548 | +} | |
1549 | + | |
1550 | + | |
1551 | +static int read_block_index(struct super_block *s, int blocks, char *block_list, | |
1552 | + long long *start_block, int *offset) | |
1553 | +{ | |
1554 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
1555 | + unsigned int *block_listp; | |
1556 | + int block = 0; | |
1557 | + | |
1558 | + if (msblk->swap) { | |
1559 | + char sblock_list[blocks << 2]; | |
1560 | + | |
1561 | + if (!squashfs_get_cached_block(s, sblock_list, *start_block, | |
1562 | + *offset, blocks << 2, start_block, offset)) { | |
1563 | + ERROR("Fail reading block list [%llx:%x]\n", *start_block, *offset); | |
1564 | + goto failure; | |
1565 | + } | |
1566 | + SQUASHFS_SWAP_INTS(((unsigned int *)block_list), | |
1567 | + ((unsigned int *)sblock_list), blocks); | |
1568 | + } else { | |
1569 | + if (!squashfs_get_cached_block(s, block_list, *start_block, | |
1570 | + *offset, blocks << 2, start_block, offset)) { | |
1571 | + ERROR("Fail reading block list [%llx:%x]\n", *start_block, *offset); | |
1572 | + goto failure; | |
1573 | + } | |
1574 | + } | |
1575 | + | |
1576 | + for (block_listp = (unsigned int *) block_list; blocks; | |
1577 | + block_listp++, blocks --) | |
1578 | + block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp); | |
1579 | + | |
1580 | + return block; | |
1581 | + | |
1582 | +failure: | |
1583 | + return -1; | |
1584 | +} | |
1585 | + | |
1586 | + | |
1587 | +#define SIZE 256 | |
1588 | + | |
1589 | +static inline int calculate_skip(int blocks) { | |
1590 | + int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES); | |
1591 | + return skip >= 7 ? 7 : skip + 1; | |
1592 | +} | |
1593 | + | |
1594 | + | |
1595 | +static int get_meta_index(struct inode *inode, int index, | |
1596 | + long long *index_block, int *index_offset, | |
1597 | + long long *data_block, char *block_list) | |
1598 | +{ | |
1599 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | |
1600 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1601 | + int skip = calculate_skip(i_size_read(inode) >> sblk->block_log); | |
1602 | + int offset = 0; | |
1603 | + struct meta_index *meta; | |
1604 | + struct meta_entry *meta_entry; | |
1605 | + long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start; | |
1606 | + int cur_offset = SQUASHFS_I(inode)->offset; | |
1607 | + long long cur_data_block = SQUASHFS_I(inode)->start_block; | |
1608 | + int i; | |
1609 | + | |
1610 | + index /= SQUASHFS_META_INDEXES * skip; | |
1611 | + | |
1612 | + while (offset < index) { | |
1613 | + meta = locate_meta_index(inode, index, offset + 1); | |
1614 | + | |
1615 | + if (meta == NULL) { | |
1616 | + meta = empty_meta_index(inode, offset + 1, skip); | |
1617 | + if (meta == NULL) | |
1618 | + goto all_done; | |
1619 | + } else { | |
1620 | + if(meta->entries == 0) | |
1621 | + goto failed; | |
1622 | + /* XXX */ | |
1623 | + offset = index < meta->offset + meta->entries ? index : | |
1624 | + meta->offset + meta->entries - 1; | |
1625 | + /* XXX */ | |
1626 | + meta_entry = &meta->meta_entry[offset - meta->offset]; | |
1627 | + cur_index_block = meta_entry->index_block + sblk->inode_table_start; | |
1628 | + cur_offset = meta_entry->offset; | |
1629 | + cur_data_block = meta_entry->data_block; | |
1630 | + TRACE("get_meta_index: offset %d, meta->offset %d, " | |
1631 | + "meta->entries %d\n", offset, meta->offset, meta->entries); | |
1632 | + TRACE("get_meta_index: index_block 0x%llx, offset 0x%x" | |
1633 | + " data_block 0x%llx\n", cur_index_block, | |
1634 | + cur_offset, cur_data_block); | |
1635 | + } | |
1636 | + | |
1637 | + for (i = meta->offset + meta->entries; i <= index && | |
1638 | + i < meta->offset + SQUASHFS_META_ENTRIES; i++) { | |
1639 | + int blocks = skip * SQUASHFS_META_INDEXES; | |
1640 | + | |
1641 | + while (blocks) { | |
1642 | + int block = blocks > (SIZE >> 2) ? (SIZE >> 2) : blocks; | |
1643 | + int res = read_block_index(inode->i_sb, block, block_list, | |
1644 | + &cur_index_block, &cur_offset); | |
1645 | + | |
1646 | + if (res == -1) | |
1647 | + goto failed; | |
1648 | + | |
1649 | + cur_data_block += res; | |
1650 | + blocks -= block; | |
1651 | + } | |
1652 | + | |
1653 | + meta_entry = &meta->meta_entry[i - meta->offset]; | |
1654 | + meta_entry->index_block = cur_index_block - sblk->inode_table_start; | |
1655 | + meta_entry->offset = cur_offset; | |
1656 | + meta_entry->data_block = cur_data_block; | |
1657 | + meta->entries ++; | |
1658 | + offset ++; | |
1659 | + } | |
1660 | + | |
1661 | + TRACE("get_meta_index: meta->offset %d, meta->entries %d\n", | |
1662 | + meta->offset, meta->entries); | |
1663 | + | |
1664 | + release_meta_index(inode, meta); | |
1665 | + } | |
1666 | + | |
1667 | +all_done: | |
1668 | + *index_block = cur_index_block; | |
1669 | + *index_offset = cur_offset; | |
1670 | + *data_block = cur_data_block; | |
1671 | + | |
1672 | + return offset * SQUASHFS_META_INDEXES * skip; | |
1673 | + | |
1674 | +failed: | |
1675 | + release_meta_index(inode, meta); | |
1676 | + return -1; | |
1677 | +} | |
1678 | + | |
1679 | + | |
1680 | +static long long read_blocklist(struct inode *inode, int index, | |
1681 | + int readahead_blks, char *block_list, | |
1682 | + unsigned short **block_p, unsigned int *bsize) | |
1683 | +{ | |
1684 | + long long block_ptr; | |
1685 | + int offset; | |
1686 | + long long block; | |
1687 | + int res = get_meta_index(inode, index, &block_ptr, &offset, &block, | |
1688 | + block_list); | |
1689 | + | |
1690 | + TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset" | |
1691 | + " 0x%x, block 0x%llx\n", res, index, block_ptr, offset, block); | |
1692 | + | |
1693 | + if(res == -1) | |
1694 | + goto failure; | |
1695 | + | |
1696 | + index -= res; | |
1697 | + | |
1698 | + while (index) { | |
1699 | + int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index; | |
1700 | + int res = read_block_index(inode->i_sb, blocks, block_list, | |
1701 | + &block_ptr, &offset); | |
1702 | + if (res == -1) | |
1703 | + goto failure; | |
1704 | + block += res; | |
1705 | + index -= blocks; | |
1706 | + } | |
1707 | + | |
1708 | + if (read_block_index(inode->i_sb, 1, block_list, &block_ptr, &offset) == -1) | |
1709 | + goto failure; | |
1710 | + *bsize = *((unsigned int *) block_list); | |
1711 | + | |
1712 | + return block; | |
1713 | + | |
1714 | +failure: | |
1715 | + return 0; | |
1716 | +} | |
1717 | + | |
1718 | + | |
1719 | +static int squashfs_readpage(struct file *file, struct page *page) | |
1720 | +{ | |
1721 | + struct inode *inode = page->mapping->host; | |
1722 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | |
1723 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1724 | + unsigned char *block_list = NULL; | |
1725 | + long long block; | |
1726 | + unsigned int bsize, i; | |
1727 | + int bytes; | |
1728 | + int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT); | |
1729 | + void *pageaddr; | |
1730 | + struct squashfs_cache_entry *fragment = NULL; | |
1731 | + char *data_ptr = msblk->read_page; | |
1732 | + | |
1733 | + int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1; | |
1734 | + int start_index = page->index & ~mask; | |
1735 | + int end_index = start_index | mask; | |
1736 | + int file_end = i_size_read(inode) >> sblk->block_log; | |
1737 | + int sparse = 0; | |
1738 | + | |
1739 | + TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n", | |
1740 | + page->index, SQUASHFS_I(inode)->start_block); | |
1741 | + | |
1742 | + if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1743 | + PAGE_CACHE_SHIFT)) | |
1744 | + goto out; | |
1745 | + | |
1746 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK | |
1747 | + || index < file_end) { | |
1748 | + block_list = kmalloc(SIZE, GFP_KERNEL); | |
1749 | + if (block_list == NULL) { | |
1750 | + ERROR("Failed to allocate block_list\n"); | |
1751 | + goto error_out; | |
1752 | + } | |
1753 | + | |
1754 | + block = (msblk->read_blocklist)(inode, index, 1, block_list, NULL, &bsize); | |
1755 | + if (block == 0) | |
1756 | + goto error_out; | |
1757 | + | |
1758 | + if (bsize == 0) { /* hole */ | |
1759 | + bytes = index == file_end ? | |
1760 | + (i_size_read(inode) & (sblk->block_size - 1)) : sblk->block_size; | |
1761 | + sparse = 1; | |
1762 | + } else { | |
1763 | + mutex_lock(&msblk->read_page_mutex); | |
1764 | + | |
1765 | + bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block, | |
1766 | + bsize, NULL, sblk->block_size); | |
1767 | + | |
1768 | + if (bytes == 0) { | |
1769 | + ERROR("Unable to read page, block %llx, size %x\n", block, bsize); | |
1770 | + mutex_unlock(&msblk->read_page_mutex); | |
1771 | + goto error_out; | |
1772 | + } | |
1773 | + } | |
1774 | + } else { | |
1775 | + fragment = get_cached_fragment(inode->i_sb, | |
1776 | + SQUASHFS_I(inode)-> u.s1.fragment_start_block, | |
1777 | + SQUASHFS_I(inode)->u.s1.fragment_size); | |
1778 | + | |
1779 | + if (fragment->error) { | |
1780 | + ERROR("Unable to read page, block %llx, size %x\n", | |
1781 | + SQUASHFS_I(inode)->u.s1.fragment_start_block, | |
1782 | + (int) SQUASHFS_I(inode)->u.s1.fragment_size); | |
1783 | + release_cached_fragment(msblk, fragment); | |
1784 | + goto error_out; | |
1785 | + } | |
1786 | + bytes = i_size_read(inode) & (sblk->block_size - 1); | |
1787 | + data_ptr = fragment->data + SQUASHFS_I(inode)->u.s1.fragment_offset; | |
1788 | + } | |
1789 | + | |
1790 | + for (i = start_index; i <= end_index && bytes > 0; i++, | |
1791 | + bytes -= PAGE_CACHE_SIZE, data_ptr += PAGE_CACHE_SIZE) { | |
1792 | + struct page *push_page; | |
1793 | + int avail = sparse ? 0 : min_t(unsigned int, bytes, PAGE_CACHE_SIZE); | |
1794 | + | |
1795 | + TRACE("bytes %d, i %d, available_bytes %d\n", bytes, i, avail); | |
1796 | + | |
1797 | + push_page = (i == page->index) ? page : | |
1798 | + grab_cache_page_nowait(page->mapping, i); | |
1799 | + | |
1800 | + if (!push_page) | |
1801 | + continue; | |
1802 | + | |
1803 | + if (PageUptodate(push_page)) | |
1804 | + goto skip_page; | |
1805 | + | |
1806 | + pageaddr = kmap_atomic(push_page, KM_USER0); | |
1807 | + memcpy(pageaddr, data_ptr, avail); | |
1808 | + memset(pageaddr + avail, 0, PAGE_CACHE_SIZE - avail); | |
1809 | + kunmap_atomic(pageaddr, KM_USER0); | |
1810 | + flush_dcache_page(push_page); | |
1811 | + SetPageUptodate(push_page); | |
1812 | +skip_page: | |
1813 | + unlock_page(push_page); | |
1814 | + if(i != page->index) | |
1815 | + page_cache_release(push_page); | |
1816 | + } | |
1817 | + | |
1818 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK | |
1819 | + || index < file_end) { | |
1820 | + if (!sparse) | |
1821 | + mutex_unlock(&msblk->read_page_mutex); | |
1822 | + kfree(block_list); | |
1823 | + } else | |
1824 | + release_cached_fragment(msblk, fragment); | |
1825 | + | |
1826 | + return 0; | |
1827 | + | |
1828 | +error_out: | |
1829 | + SetPageError(page); | |
1830 | +out: | |
1831 | + pageaddr = kmap_atomic(page, KM_USER0); | |
1832 | + memset(pageaddr, 0, PAGE_CACHE_SIZE); | |
1833 | + kunmap_atomic(pageaddr, KM_USER0); | |
1834 | + flush_dcache_page(page); | |
1835 | + if (!PageError(page)) | |
1836 | + SetPageUptodate(page); | |
1837 | + unlock_page(page); | |
1838 | + | |
1839 | + kfree(block_list); | |
1840 | + return 0; | |
1841 | +} | |
1842 | + | |
1843 | + | |
1844 | +static int get_dir_index_using_offset(struct super_block *s, | |
1845 | + long long *next_block, unsigned int *next_offset, | |
1846 | + long long index_start, unsigned int index_offset, int i_count, | |
1847 | + long long f_pos) | |
1848 | +{ | |
1849 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
1850 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1851 | + int i, length = 0; | |
1852 | + struct squashfs_dir_index index; | |
1853 | + | |
1854 | + TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", | |
1855 | + i_count, (unsigned int) f_pos); | |
1856 | + | |
1857 | + f_pos -= 3; | |
1858 | + if (f_pos == 0) | |
1859 | + goto finish; | |
1860 | + | |
1861 | + for (i = 0; i < i_count; i++) { | |
1862 | + if (msblk->swap) { | |
1863 | + struct squashfs_dir_index sindex; | |
1864 | + squashfs_get_cached_block(s, &sindex, index_start, index_offset, | |
1865 | + sizeof(sindex), &index_start, &index_offset); | |
1866 | + SQUASHFS_SWAP_DIR_INDEX(&index, &sindex); | |
1867 | + } else | |
1868 | + squashfs_get_cached_block(s, &index, index_start, index_offset, | |
1869 | + sizeof(index), &index_start, &index_offset); | |
1870 | + | |
1871 | + if (index.index > f_pos) | |
1872 | + break; | |
1873 | + | |
1874 | + squashfs_get_cached_block(s, NULL, index_start, index_offset, | |
1875 | + index.size + 1, &index_start, &index_offset); | |
1876 | + | |
1877 | + length = index.index; | |
1878 | + *next_block = index.start_block + sblk->directory_table_start; | |
1879 | + } | |
1880 | + | |
1881 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | |
1882 | + | |
1883 | +finish: | |
1884 | + return length + 3; | |
1885 | +} | |
1886 | + | |
1887 | + | |
1888 | +static int get_dir_index_using_name(struct super_block *s, | |
1889 | + long long *next_block, unsigned int *next_offset, | |
1890 | + long long index_start, unsigned int index_offset, int i_count, | |
1891 | + const char *name, int size) | |
1892 | +{ | |
1893 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
1894 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1895 | + int i, length = 0; | |
1896 | + struct squashfs_dir_index *index; | |
1897 | + char *str; | |
1898 | + | |
1899 | + TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count); | |
1900 | + | |
1901 | + str = kmalloc(sizeof(struct squashfs_dir_index) + | |
1902 | + (SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL); | |
1903 | + if (str == NULL) { | |
1904 | + ERROR("Failed to allocate squashfs_dir_index\n"); | |
1905 | + goto failure; | |
1906 | + } | |
1907 | + | |
1908 | + index = (struct squashfs_dir_index *) (str + SQUASHFS_NAME_LEN + 1); | |
1909 | + strncpy(str, name, size); | |
1910 | + str[size] = '\0'; | |
1911 | + | |
1912 | + for (i = 0; i < i_count; i++) { | |
1913 | + if (msblk->swap) { | |
1914 | + struct squashfs_dir_index sindex; | |
1915 | + squashfs_get_cached_block(s, &sindex, index_start, index_offset, | |
1916 | + sizeof(sindex), &index_start, &index_offset); | |
1917 | + SQUASHFS_SWAP_DIR_INDEX(index, &sindex); | |
1918 | + } else | |
1919 | + squashfs_get_cached_block(s, index, index_start, index_offset, | |
1920 | + sizeof(struct squashfs_dir_index), &index_start, &index_offset); | |
1921 | + | |
1922 | + squashfs_get_cached_block(s, index->name, index_start, index_offset, | |
1923 | + index->size + 1, &index_start, &index_offset); | |
1924 | + | |
1925 | + index->name[index->size + 1] = '\0'; | |
1926 | + | |
1927 | + if (strcmp(index->name, str) > 0) | |
1928 | + break; | |
1929 | + | |
1930 | + length = index->index; | |
1931 | + *next_block = index->start_block + sblk->directory_table_start; | |
1932 | + } | |
1933 | + | |
1934 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | |
1935 | + kfree(str); | |
1936 | + | |
1937 | +failure: | |
1938 | + return length + 3; | |
1939 | +} | |
1940 | + | |
1941 | + | |
1942 | +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir) | |
1943 | +{ | |
1944 | + struct inode *i = file->f_dentry->d_inode; | |
1945 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | |
1946 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
1947 | + long long next_block = SQUASHFS_I(i)->start_block + | |
1948 | + sblk->directory_table_start; | |
1949 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, dir_count; | |
1950 | + struct squashfs_dir_header dirh; | |
1951 | + struct squashfs_dir_entry *dire; | |
1952 | + | |
1953 | + TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset); | |
1954 | + | |
1955 | + dire = kmalloc(sizeof(struct squashfs_dir_entry) + | |
1956 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL); | |
1957 | + if (dire == NULL) { | |
1958 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | |
1959 | + goto finish; | |
1960 | + } | |
1961 | + | |
1962 | + while(file->f_pos < 3) { | |
1963 | + char *name; | |
1964 | + int size, i_ino; | |
1965 | + | |
1966 | + if(file->f_pos == 0) { | |
1967 | + name = "."; | |
1968 | + size = 1; | |
1969 | + i_ino = i->i_ino; | |
1970 | + } else { | |
1971 | + name = ".."; | |
1972 | + size = 2; | |
1973 | + i_ino = SQUASHFS_I(i)->u.s2.parent_inode; | |
1974 | + } | |
1975 | + TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n", | |
1976 | + (unsigned int) dirent, name, size, (int) | |
1977 | + file->f_pos, i_ino, squashfs_filetype_table[1]); | |
1978 | + | |
1979 | + if (filldir(dirent, name, size, file->f_pos, i_ino, | |
1980 | + squashfs_filetype_table[1]) < 0) { | |
1981 | + TRACE("Filldir returned less than 0\n"); | |
1982 | + goto finish; | |
1983 | + } | |
1984 | + file->f_pos += size; | |
1985 | + } | |
1986 | + | |
1987 | + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, | |
1988 | + SQUASHFS_I(i)->u.s2.directory_index_start, | |
1989 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | |
1990 | + SQUASHFS_I(i)->u.s2.directory_index_count, file->f_pos); | |
1991 | + | |
1992 | + while (length < i_size_read(i)) { | |
1993 | + /* read directory header */ | |
1994 | + if (msblk->swap) { | |
1995 | + struct squashfs_dir_header sdirh; | |
1996 | + | |
1997 | + if (!squashfs_get_cached_block(i->i_sb, &sdirh, next_block, | |
1998 | + next_offset, sizeof(sdirh), &next_block, &next_offset)) | |
1999 | + goto failed_read; | |
2000 | + | |
2001 | + length += sizeof(sdirh); | |
2002 | + SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh); | |
2003 | + } else { | |
2004 | + if (!squashfs_get_cached_block(i->i_sb, &dirh, next_block, | |
2005 | + next_offset, sizeof(dirh), &next_block, &next_offset)) | |
2006 | + goto failed_read; | |
2007 | + | |
2008 | + length += sizeof(dirh); | |
2009 | + } | |
2010 | + | |
2011 | + dir_count = dirh.count + 1; | |
2012 | + while (dir_count--) { | |
2013 | + if (msblk->swap) { | |
2014 | + struct squashfs_dir_entry sdire; | |
2015 | + if (!squashfs_get_cached_block(i->i_sb, &sdire, next_block, | |
2016 | + next_offset, sizeof(sdire), &next_block, &next_offset)) | |
2017 | + goto failed_read; | |
2018 | + | |
2019 | + length += sizeof(sdire); | |
2020 | + SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire); | |
2021 | + } else { | |
2022 | + if (!squashfs_get_cached_block(i->i_sb, dire, next_block, | |
2023 | + next_offset, sizeof(*dire), &next_block, &next_offset)) | |
2024 | + goto failed_read; | |
2025 | + | |
2026 | + length += sizeof(*dire); | |
2027 | + } | |
2028 | + | |
2029 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, next_block, | |
2030 | + next_offset, dire->size + 1, &next_block, &next_offset)) | |
2031 | + goto failed_read; | |
2032 | + | |
2033 | + length += dire->size + 1; | |
2034 | + | |
2035 | + if (file->f_pos >= length) | |
2036 | + continue; | |
2037 | + | |
2038 | + dire->name[dire->size + 1] = '\0'; | |
2039 | + | |
2040 | + TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n", | |
2041 | + (unsigned int) dirent, dire->name, dire->size + 1, | |
2042 | + (int) file->f_pos, dirh.start_block, dire->offset, | |
2043 | + dirh.inode_number + dire->inode_number, | |
2044 | + squashfs_filetype_table[dire->type]); | |
2045 | + | |
2046 | + if (filldir(dirent, dire->name, dire->size + 1, file->f_pos, | |
2047 | + dirh.inode_number + dire->inode_number, | |
2048 | + squashfs_filetype_table[dire->type]) < 0) { | |
2049 | + TRACE("Filldir returned less than 0\n"); | |
2050 | + goto finish; | |
2051 | + } | |
2052 | + file->f_pos = length; | |
2053 | + } | |
2054 | + } | |
2055 | + | |
2056 | +finish: | |
2057 | + kfree(dire); | |
2058 | + return 0; | |
2059 | + | |
2060 | +failed_read: | |
2061 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | |
2062 | + next_offset); | |
2063 | + kfree(dire); | |
2064 | + return 0; | |
2065 | +} | |
2066 | + | |
2067 | + | |
2068 | +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry, | |
2069 | + struct nameidata *nd) | |
2070 | +{ | |
2071 | + const unsigned char *name = dentry->d_name.name; | |
2072 | + int len = dentry->d_name.len; | |
2073 | + struct inode *inode = NULL; | |
2074 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | |
2075 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2076 | + long long next_block = SQUASHFS_I(i)->start_block + | |
2077 | + sblk->directory_table_start; | |
2078 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, dir_count; | |
2079 | + struct squashfs_dir_header dirh; | |
2080 | + struct squashfs_dir_entry *dire; | |
2081 | + | |
2082 | + TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset); | |
2083 | + | |
2084 | + dire = kmalloc(sizeof(struct squashfs_dir_entry) + | |
2085 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL); | |
2086 | + if (dire == NULL) { | |
2087 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | |
2088 | + goto exit_lookup; | |
2089 | + } | |
2090 | + | |
2091 | + if (len > SQUASHFS_NAME_LEN) | |
2092 | + goto exit_lookup; | |
2093 | + | |
2094 | + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, | |
2095 | + SQUASHFS_I(i)->u.s2.directory_index_start, | |
2096 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | |
2097 | + SQUASHFS_I(i)->u.s2.directory_index_count, name, len); | |
2098 | + | |
2099 | + while (length < i_size_read(i)) { | |
2100 | + /* read directory header */ | |
2101 | + if (msblk->swap) { | |
2102 | + struct squashfs_dir_header sdirh; | |
2103 | + if (!squashfs_get_cached_block(i->i_sb, &sdirh, next_block, | |
2104 | + next_offset, sizeof(sdirh), &next_block, &next_offset)) | |
2105 | + goto failed_read; | |
2106 | + | |
2107 | + length += sizeof(sdirh); | |
2108 | + SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh); | |
2109 | + } else { | |
2110 | + if (!squashfs_get_cached_block(i->i_sb, &dirh, next_block, | |
2111 | + next_offset, sizeof(dirh), &next_block, &next_offset)) | |
2112 | + goto failed_read; | |
2113 | + | |
2114 | + length += sizeof(dirh); | |
2115 | + } | |
2116 | + | |
2117 | + dir_count = dirh.count + 1; | |
2118 | + while (dir_count--) { | |
2119 | + if (msblk->swap) { | |
2120 | + struct squashfs_dir_entry sdire; | |
2121 | + if (!squashfs_get_cached_block(i->i_sb, &sdire, next_block, | |
2122 | + next_offset, sizeof(sdire), &next_block, &next_offset)) | |
2123 | + goto failed_read; | |
2124 | + | |
2125 | + length += sizeof(sdire); | |
2126 | + SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire); | |
2127 | + } else { | |
2128 | + if (!squashfs_get_cached_block(i->i_sb, dire, next_block, | |
2129 | + next_offset, sizeof(*dire), &next_block, &next_offset)) | |
2130 | + goto failed_read; | |
2131 | + | |
2132 | + length += sizeof(*dire); | |
2133 | + } | |
2134 | + | |
2135 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, next_block, | |
2136 | + next_offset, dire->size + 1, &next_block, &next_offset)) | |
2137 | + goto failed_read; | |
2138 | + | |
2139 | + length += dire->size + 1; | |
2140 | + | |
2141 | + if (name[0] < dire->name[0]) | |
2142 | + goto exit_lookup; | |
2143 | + | |
2144 | + if ((len == dire->size + 1) && !strncmp(name, dire->name, len)) { | |
2145 | + squashfs_inode_t ino = SQUASHFS_MKINODE(dirh.start_block, | |
2146 | + dire->offset); | |
2147 | + | |
2148 | + TRACE("calling squashfs_iget for directory entry %s, inode" | |
2149 | + " %x:%x, %d\n", name, dirh.start_block, dire->offset, | |
2150 | + dirh.inode_number + dire->inode_number); | |
2151 | + | |
2152 | + inode = squashfs_iget(i->i_sb, ino, dirh.inode_number + dire->inode_number); | |
2153 | + | |
2154 | + goto exit_lookup; | |
2155 | + } | |
2156 | + } | |
2157 | + } | |
2158 | + | |
2159 | +exit_lookup: | |
2160 | + kfree(dire); | |
2161 | + if (inode) | |
2162 | + return d_splice_alias(inode, dentry); | |
2163 | + d_add(dentry, inode); | |
2164 | + return ERR_PTR(0); | |
2165 | + | |
2166 | +failed_read: | |
2167 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | |
2168 | + next_offset); | |
2169 | + goto exit_lookup; | |
2170 | +} | |
2171 | + | |
2172 | + | |
2173 | +static int squashfs_remount(struct super_block *s, int *flags, char *data) | |
2174 | +{ | |
2175 | + *flags |= MS_RDONLY; | |
2176 | + return 0; | |
2177 | +} | |
2178 | + | |
2179 | + | |
2180 | +static void squashfs_put_super(struct super_block *s) | |
2181 | +{ | |
2182 | + if (s->s_fs_info) { | |
2183 | + struct squashfs_sb_info *sbi = s->s_fs_info; | |
2184 | + squashfs_cache_delete(sbi->block_cache); | |
2185 | + squashfs_cache_delete(sbi->fragment_cache); | |
2186 | + vfree(sbi->read_page); | |
2187 | + kfree(sbi->uid); | |
2188 | + kfree(sbi->fragment_index); | |
2189 | + kfree(sbi->fragment_index_2); | |
2190 | + kfree(sbi->meta_index); | |
2191 | + vfree(sbi->stream.workspace); | |
2192 | + kfree(s->s_fs_info); | |
2193 | + s->s_fs_info = NULL; | |
2194 | + } | |
2195 | +} | |
2196 | + | |
2197 | + | |
2198 | +static int squashfs_get_sb(struct file_system_type *fs_type, int flags, | |
2199 | + const char *dev_name, void *data, struct vfsmount *mnt) | |
2200 | +{ | |
2201 | + return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super, | |
2202 | + mnt); | |
2203 | +} | |
2204 | + | |
2205 | + | |
2206 | +static int __init init_squashfs_fs(void) | |
2207 | +{ | |
2208 | + int err = init_inodecache(); | |
2209 | + if (err) | |
2210 | + goto out; | |
2211 | + | |
2212 | + printk(KERN_INFO "squashfs: version 3.4 (2008/08/26) " | |
2213 | + "Phillip Lougher\n"); | |
2214 | + | |
2215 | + err = register_filesystem(&squashfs_fs_type); | |
2216 | + if (err) | |
2217 | + destroy_inodecache(); | |
2218 | + | |
2219 | +out: | |
2220 | + return err; | |
2221 | +} | |
2222 | + | |
2223 | + | |
2224 | +static void __exit exit_squashfs_fs(void) | |
2225 | +{ | |
2226 | + unregister_filesystem(&squashfs_fs_type); | |
2227 | + destroy_inodecache(); | |
2228 | +} | |
2229 | + | |
2230 | + | |
2231 | +static struct kmem_cache * squashfs_inode_cachep; | |
2232 | + | |
2233 | + | |
2234 | +static struct inode *squashfs_alloc_inode(struct super_block *sb) | |
2235 | +{ | |
2236 | + struct squashfs_inode_info *ei; | |
2237 | + ei = kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL); | |
2238 | + return ei ? &ei->vfs_inode : NULL; | |
2239 | +} | |
2240 | + | |
2241 | + | |
2242 | +static void squashfs_destroy_inode(struct inode *inode) | |
2243 | +{ | |
2244 | + kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode)); | |
2245 | +} | |
2246 | + | |
2247 | + | |
2248 | +static void init_once(void *foo) | |
2249 | +{ | |
2250 | + struct squashfs_inode_info *ei = foo; | |
2251 | + | |
2252 | + inode_init_once(&ei->vfs_inode); | |
2253 | +} | |
2254 | + | |
2255 | + | |
2256 | +static int __init init_inodecache(void) | |
2257 | +{ | |
2258 | + squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | |
2259 | + sizeof(struct squashfs_inode_info), 0, | |
2260 | + SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, init_once); | |
2261 | + if (squashfs_inode_cachep == NULL) | |
2262 | + return -ENOMEM; | |
2263 | + return 0; | |
2264 | +} | |
2265 | + | |
2266 | + | |
2267 | +static void destroy_inodecache(void) | |
2268 | +{ | |
2269 | + kmem_cache_destroy(squashfs_inode_cachep); | |
2270 | +} | |
2271 | + | |
2272 | + | |
2273 | +module_init(init_squashfs_fs); | |
2274 | +module_exit(exit_squashfs_fs); | |
2275 | +MODULE_DESCRIPTION("squashfs 3.4, a compressed read-only filesystem"); | |
2276 | +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.demon.co.uk>"); | |
2277 | +MODULE_LICENSE("GPL"); | |
2278 | --- /dev/null | |
2279 | +++ b/fs/squashfs/squashfs.h | |
2280 | @@ -0,0 +1,86 @@ | |
2281 | +/* | |
2282 | + * Squashfs - a compressed read only filesystem for Linux | |
2283 | + * | |
2284 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
2285 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | |
2286 | + * | |
2287 | + * This program is free software; you can redistribute it and/or | |
2288 | + * modify it under the terms of the GNU General Public License | |
2289 | + * as published by the Free Software Foundation; either version 2, | |
2290 | + * or (at your option) any later version. | |
2291 | + * | |
2292 | + * This program is distributed in the hope that it will be useful, | |
2293 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2294 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2295 | + * GNU General Public License for more details. | |
2296 | + * | |
2297 | + * You should have received a copy of the GNU General Public License | |
2298 | + * along with this program; if not, write to the Free Software | |
2299 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
2300 | + * | |
2301 | + * squashfs.h | |
2302 | + */ | |
2303 | + | |
2304 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY | |
2305 | +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY | |
2306 | +#endif | |
2307 | + | |
2308 | +#ifdef SQUASHFS_TRACE | |
2309 | +#define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS: "s, ## args) | |
2310 | +#else | |
2311 | +#define TRACE(s, args...) {} | |
2312 | +#endif | |
2313 | + | |
2314 | +#define ERROR(s, args...) printk(KERN_ERR "SQUASHFS error: "s, ## args) | |
2315 | + | |
2316 | +#define SERROR(s, args...) do { \ | |
2317 | + if (!silent) \ | |
2318 | + printk(KERN_ERR "SQUASHFS error: "s, ## args);\ | |
2319 | + } while(0) | |
2320 | + | |
2321 | +#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args) | |
2322 | + | |
2323 | +static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode) | |
2324 | +{ | |
2325 | + return list_entry(inode, struct squashfs_inode_info, vfs_inode); | |
2326 | +} | |
2327 | + | |
2328 | +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY) | |
2329 | +#define SQSH_EXTERN | |
2330 | +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer, | |
2331 | + long long index, unsigned int length, | |
2332 | + long long *next_index, int srclength); | |
2333 | +extern int squashfs_get_cached_block(struct super_block *s, void *buffer, | |
2334 | + long long block, unsigned int offset, | |
2335 | + int length, long long *next_block, | |
2336 | + unsigned int *next_offset); | |
2337 | +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct | |
2338 | + squashfs_cache_entry *fragment); | |
2339 | +extern struct squashfs_cache_entry *get_cached_fragment(struct super_block | |
2340 | + *s, long long start_block, | |
2341 | + int length); | |
2342 | +extern struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode, unsigned int inode_number); | |
2343 | +extern const struct address_space_operations squashfs_symlink_aops; | |
2344 | +extern const struct address_space_operations squashfs_aops; | |
2345 | +extern struct inode_operations squashfs_dir_inode_ops; | |
2346 | +#else | |
2347 | +#define SQSH_EXTERN static | |
2348 | +#endif | |
2349 | + | |
2350 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY | |
2351 | +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk); | |
2352 | +#else | |
2353 | +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk) | |
2354 | +{ | |
2355 | + return 0; | |
2356 | +} | |
2357 | +#endif | |
2358 | + | |
2359 | +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY | |
2360 | +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk); | |
2361 | +#else | |
2362 | +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk) | |
2363 | +{ | |
2364 | + return 0; | |
2365 | +} | |
2366 | +#endif | |
2367 | --- /dev/null | |
2368 | +++ b/fs/squashfs/squashfs2_0.c | |
2369 | @@ -0,0 +1,740 @@ | |
2370 | +/* | |
2371 | + * Squashfs - a compressed read only filesystem for Linux | |
2372 | + * | |
2373 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
2374 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | |
2375 | + * | |
2376 | + * This program is free software; you can redistribute it and/or | |
2377 | + * modify it under the terms of the GNU General Public License | |
2378 | + * as published by the Free Software Foundation; either version 2, | |
2379 | + * or (at your option) any later version. | |
2380 | + * | |
2381 | + * This program is distributed in the hope that it will be useful, | |
2382 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2383 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2384 | + * GNU General Public License for more details. | |
2385 | + * | |
2386 | + * You should have received a copy of the GNU General Public License | |
2387 | + * along with this program; if not, write to the Free Software | |
2388 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
2389 | + * | |
2390 | + * squashfs2_0.c | |
2391 | + */ | |
2392 | + | |
2393 | +#include <linux/squashfs_fs.h> | |
2394 | +#include <linux/module.h> | |
2395 | +#include <linux/zlib.h> | |
2396 | +#include <linux/fs.h> | |
2397 | +#include <linux/squashfs_fs_sb.h> | |
2398 | +#include <linux/squashfs_fs_i.h> | |
2399 | + | |
2400 | +#include "squashfs.h" | |
2401 | +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir); | |
2402 | +static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *, | |
2403 | + struct nameidata *); | |
2404 | + | |
2405 | +static struct file_operations squashfs_dir_ops_2 = { | |
2406 | + .read = generic_read_dir, | |
2407 | + .readdir = squashfs_readdir_2 | |
2408 | +}; | |
2409 | + | |
2410 | +static struct inode_operations squashfs_dir_inode_ops_2 = { | |
2411 | + .lookup = squashfs_lookup_2 | |
2412 | +}; | |
2413 | + | |
2414 | +static unsigned char squashfs_filetype_table[] = { | |
2415 | + DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK | |
2416 | +}; | |
2417 | + | |
2418 | +static int read_fragment_index_table_2(struct super_block *s) | |
2419 | +{ | |
2420 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
2421 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2422 | + | |
2423 | + if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2 | |
2424 | + (sblk->fragments), GFP_KERNEL))) { | |
2425 | + ERROR("Failed to allocate uid/gid table\n"); | |
2426 | + return 0; | |
2427 | + } | |
2428 | + | |
2429 | + if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) && | |
2430 | + !squashfs_read_data(s, (char *) | |
2431 | + msblk->fragment_index_2, | |
2432 | + sblk->fragment_table_start, | |
2433 | + SQUASHFS_FRAGMENT_INDEX_BYTES_2 | |
2434 | + (sblk->fragments) | | |
2435 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments))) { | |
2436 | + ERROR("unable to read fragment index table\n"); | |
2437 | + return 0; | |
2438 | + } | |
2439 | + | |
2440 | + if (msblk->swap) { | |
2441 | + int i; | |
2442 | + unsigned int fragment; | |
2443 | + | |
2444 | + for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments); | |
2445 | + i++) { | |
2446 | + SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment), | |
2447 | + &msblk->fragment_index_2[i], 1); | |
2448 | + msblk->fragment_index_2[i] = fragment; | |
2449 | + } | |
2450 | + } | |
2451 | + | |
2452 | + return 1; | |
2453 | +} | |
2454 | + | |
2455 | + | |
2456 | +static int get_fragment_location_2(struct super_block *s, unsigned int fragment, | |
2457 | + long long *fragment_start_block, | |
2458 | + unsigned int *fragment_size) | |
2459 | +{ | |
2460 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
2461 | + long long start_block = | |
2462 | + msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)]; | |
2463 | + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment); | |
2464 | + struct squashfs_fragment_entry_2 fragment_entry; | |
2465 | + | |
2466 | + if (msblk->swap) { | |
2467 | + struct squashfs_fragment_entry_2 sfragment_entry; | |
2468 | + | |
2469 | + if (!squashfs_get_cached_block(s, (char *) &sfragment_entry, | |
2470 | + start_block, offset, | |
2471 | + sizeof(sfragment_entry), &start_block, | |
2472 | + &offset)) | |
2473 | + goto out; | |
2474 | + SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry); | |
2475 | + } else | |
2476 | + if (!squashfs_get_cached_block(s, (char *) &fragment_entry, | |
2477 | + start_block, offset, | |
2478 | + sizeof(fragment_entry), &start_block, | |
2479 | + &offset)) | |
2480 | + goto out; | |
2481 | + | |
2482 | + *fragment_start_block = fragment_entry.start_block; | |
2483 | + *fragment_size = fragment_entry.size; | |
2484 | + | |
2485 | + return 1; | |
2486 | + | |
2487 | +out: | |
2488 | + return 0; | |
2489 | +} | |
2490 | + | |
2491 | + | |
2492 | +static void squashfs_new_inode(struct squashfs_sb_info *msblk, struct inode *i, | |
2493 | + struct squashfs_base_inode_header_2 *inodeb, unsigned int ino) | |
2494 | +{ | |
2495 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2496 | + | |
2497 | + i->i_ino = ino; | |
2498 | + i->i_mtime.tv_sec = sblk->mkfs_time; | |
2499 | + i->i_atime.tv_sec = sblk->mkfs_time; | |
2500 | + i->i_ctime.tv_sec = sblk->mkfs_time; | |
2501 | + i->i_uid = msblk->uid[inodeb->uid]; | |
2502 | + i->i_mode = inodeb->mode; | |
2503 | + i->i_nlink = 1; | |
2504 | + i->i_size = 0; | |
2505 | + if (inodeb->guid == SQUASHFS_GUIDS) | |
2506 | + i->i_gid = i->i_uid; | |
2507 | + else | |
2508 | + i->i_gid = msblk->guid[inodeb->guid]; | |
2509 | +} | |
2510 | + | |
2511 | + | |
2512 | +static int squashfs_read_inode_2(struct inode *i, squashfs_inode_t inode) | |
2513 | +{ | |
2514 | + struct super_block *s = i->i_sb; | |
2515 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
2516 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2517 | + unsigned int block = SQUASHFS_INODE_BLK(inode) + | |
2518 | + sblk->inode_table_start; | |
2519 | + unsigned int offset = SQUASHFS_INODE_OFFSET(inode); | |
2520 | + unsigned int ino = SQUASHFS_MK_VFS_INODE(block - | |
2521 | + sblk->inode_table_start, offset); | |
2522 | + long long next_block; | |
2523 | + unsigned int next_offset; | |
2524 | + union squashfs_inode_header_2 id, sid; | |
2525 | + struct squashfs_base_inode_header_2 *inodeb = &id.base, | |
2526 | + *sinodeb = &sid.base; | |
2527 | + | |
2528 | + TRACE("Entered squashfs_read_inode_2\n"); | |
2529 | + | |
2530 | + if (msblk->swap) { | |
2531 | + if (!squashfs_get_cached_block(s, (char *) sinodeb, block, | |
2532 | + offset, sizeof(*sinodeb), &next_block, | |
2533 | + &next_offset)) | |
2534 | + goto failed_read; | |
2535 | + SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb, | |
2536 | + sizeof(*sinodeb)); | |
2537 | + } else | |
2538 | + if (!squashfs_get_cached_block(s, (char *) inodeb, block, | |
2539 | + offset, sizeof(*inodeb), &next_block, | |
2540 | + &next_offset)) | |
2541 | + goto failed_read; | |
2542 | + | |
2543 | + squashfs_new_inode(msblk, i, inodeb, ino); | |
2544 | + | |
2545 | + switch(inodeb->inode_type) { | |
2546 | + case SQUASHFS_FILE_TYPE: { | |
2547 | + struct squashfs_reg_inode_header_2 *inodep = &id.reg; | |
2548 | + struct squashfs_reg_inode_header_2 *sinodep = &sid.reg; | |
2549 | + long long frag_blk; | |
2550 | + unsigned int frag_size = 0; | |
2551 | + | |
2552 | + if (msblk->swap) { | |
2553 | + if (!squashfs_get_cached_block(s, (char *) | |
2554 | + sinodep, block, offset, | |
2555 | + sizeof(*sinodep), &next_block, | |
2556 | + &next_offset)) | |
2557 | + goto failed_read; | |
2558 | + SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep); | |
2559 | + } else | |
2560 | + if (!squashfs_get_cached_block(s, (char *) | |
2561 | + inodep, block, offset, | |
2562 | + sizeof(*inodep), &next_block, | |
2563 | + &next_offset)) | |
2564 | + goto failed_read; | |
2565 | + | |
2566 | + frag_blk = SQUASHFS_INVALID_BLK; | |
2567 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG && | |
2568 | + !get_fragment_location_2(s, | |
2569 | + inodep->fragment, &frag_blk, &frag_size)) | |
2570 | + goto failed_read; | |
2571 | + | |
2572 | + i->i_size = inodep->file_size; | |
2573 | + i->i_fop = &generic_ro_fops; | |
2574 | + i->i_mode |= S_IFREG; | |
2575 | + i->i_mtime.tv_sec = inodep->mtime; | |
2576 | + i->i_atime.tv_sec = inodep->mtime; | |
2577 | + i->i_ctime.tv_sec = inodep->mtime; | |
2578 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; | |
2579 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; | |
2580 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; | |
2581 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; | |
2582 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
2583 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; | |
2584 | + SQUASHFS_I(i)->offset = next_offset; | |
2585 | + i->i_data.a_ops = &squashfs_aops; | |
2586 | + | |
2587 | + TRACE("File inode %x:%x, start_block %x, " | |
2588 | + "block_list_start %llx, offset %x\n", | |
2589 | + SQUASHFS_INODE_BLK(inode), offset, | |
2590 | + inodep->start_block, next_block, | |
2591 | + next_offset); | |
2592 | + break; | |
2593 | + } | |
2594 | + case SQUASHFS_DIR_TYPE: { | |
2595 | + struct squashfs_dir_inode_header_2 *inodep = &id.dir; | |
2596 | + struct squashfs_dir_inode_header_2 *sinodep = &sid.dir; | |
2597 | + | |
2598 | + if (msblk->swap) { | |
2599 | + if (!squashfs_get_cached_block(s, (char *) | |
2600 | + sinodep, block, offset, | |
2601 | + sizeof(*sinodep), &next_block, | |
2602 | + &next_offset)) | |
2603 | + goto failed_read; | |
2604 | + SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep); | |
2605 | + } else | |
2606 | + if (!squashfs_get_cached_block(s, (char *) | |
2607 | + inodep, block, offset, | |
2608 | + sizeof(*inodep), &next_block, | |
2609 | + &next_offset)) | |
2610 | + goto failed_read; | |
2611 | + | |
2612 | + i->i_size = inodep->file_size; | |
2613 | + i->i_op = &squashfs_dir_inode_ops_2; | |
2614 | + i->i_fop = &squashfs_dir_ops_2; | |
2615 | + i->i_mode |= S_IFDIR; | |
2616 | + i->i_mtime.tv_sec = inodep->mtime; | |
2617 | + i->i_atime.tv_sec = inodep->mtime; | |
2618 | + i->i_ctime.tv_sec = inodep->mtime; | |
2619 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
2620 | + SQUASHFS_I(i)->offset = inodep->offset; | |
2621 | + SQUASHFS_I(i)->u.s2.directory_index_count = 0; | |
2622 | + SQUASHFS_I(i)->u.s2.parent_inode = 0; | |
2623 | + | |
2624 | + TRACE("Directory inode %x:%x, start_block %x, offset " | |
2625 | + "%x\n", SQUASHFS_INODE_BLK(inode), | |
2626 | + offset, inodep->start_block, | |
2627 | + inodep->offset); | |
2628 | + break; | |
2629 | + } | |
2630 | + case SQUASHFS_LDIR_TYPE: { | |
2631 | + struct squashfs_ldir_inode_header_2 *inodep = &id.ldir; | |
2632 | + struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir; | |
2633 | + | |
2634 | + if (msblk->swap) { | |
2635 | + if (!squashfs_get_cached_block(s, (char *) | |
2636 | + sinodep, block, offset, | |
2637 | + sizeof(*sinodep), &next_block, | |
2638 | + &next_offset)) | |
2639 | + goto failed_read; | |
2640 | + SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep, | |
2641 | + sinodep); | |
2642 | + } else | |
2643 | + if (!squashfs_get_cached_block(s, (char *) | |
2644 | + inodep, block, offset, | |
2645 | + sizeof(*inodep), &next_block, | |
2646 | + &next_offset)) | |
2647 | + goto failed_read; | |
2648 | + | |
2649 | + i->i_size = inodep->file_size; | |
2650 | + i->i_op = &squashfs_dir_inode_ops_2; | |
2651 | + i->i_fop = &squashfs_dir_ops_2; | |
2652 | + i->i_mode |= S_IFDIR; | |
2653 | + i->i_mtime.tv_sec = inodep->mtime; | |
2654 | + i->i_atime.tv_sec = inodep->mtime; | |
2655 | + i->i_ctime.tv_sec = inodep->mtime; | |
2656 | + SQUASHFS_I(i)->start_block = inodep->start_block; | |
2657 | + SQUASHFS_I(i)->offset = inodep->offset; | |
2658 | + SQUASHFS_I(i)->u.s2.directory_index_start = next_block; | |
2659 | + SQUASHFS_I(i)->u.s2.directory_index_offset = | |
2660 | + next_offset; | |
2661 | + SQUASHFS_I(i)->u.s2.directory_index_count = | |
2662 | + inodep->i_count; | |
2663 | + SQUASHFS_I(i)->u.s2.parent_inode = 0; | |
2664 | + | |
2665 | + TRACE("Long directory inode %x:%x, start_block %x, " | |
2666 | + "offset %x\n", | |
2667 | + SQUASHFS_INODE_BLK(inode), offset, | |
2668 | + inodep->start_block, inodep->offset); | |
2669 | + break; | |
2670 | + } | |
2671 | + case SQUASHFS_SYMLINK_TYPE: { | |
2672 | + struct squashfs_symlink_inode_header_2 *inodep = | |
2673 | + &id.symlink; | |
2674 | + struct squashfs_symlink_inode_header_2 *sinodep = | |
2675 | + &sid.symlink; | |
2676 | + | |
2677 | + if (msblk->swap) { | |
2678 | + if (!squashfs_get_cached_block(s, (char *) | |
2679 | + sinodep, block, offset, | |
2680 | + sizeof(*sinodep), &next_block, | |
2681 | + &next_offset)) | |
2682 | + goto failed_read; | |
2683 | + SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep, | |
2684 | + sinodep); | |
2685 | + } else | |
2686 | + if (!squashfs_get_cached_block(s, (char *) | |
2687 | + inodep, block, offset, | |
2688 | + sizeof(*inodep), &next_block, | |
2689 | + &next_offset)) | |
2690 | + goto failed_read; | |
2691 | + | |
2692 | + i->i_size = inodep->symlink_size; | |
2693 | + i->i_op = &page_symlink_inode_operations; | |
2694 | + i->i_data.a_ops = &squashfs_symlink_aops; | |
2695 | + i->i_mode |= S_IFLNK; | |
2696 | + SQUASHFS_I(i)->start_block = next_block; | |
2697 | + SQUASHFS_I(i)->offset = next_offset; | |
2698 | + | |
2699 | + TRACE("Symbolic link inode %x:%x, start_block %llx, " | |
2700 | + "offset %x\n", | |
2701 | + SQUASHFS_INODE_BLK(inode), offset, | |
2702 | + next_block, next_offset); | |
2703 | + break; | |
2704 | + } | |
2705 | + case SQUASHFS_BLKDEV_TYPE: | |
2706 | + case SQUASHFS_CHRDEV_TYPE: { | |
2707 | + struct squashfs_dev_inode_header_2 *inodep = &id.dev; | |
2708 | + struct squashfs_dev_inode_header_2 *sinodep = &sid.dev; | |
2709 | + | |
2710 | + if (msblk->swap) { | |
2711 | + if (!squashfs_get_cached_block(s, (char *) | |
2712 | + sinodep, block, offset, | |
2713 | + sizeof(*sinodep), &next_block, | |
2714 | + &next_offset)) | |
2715 | + goto failed_read; | |
2716 | + SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep); | |
2717 | + } else | |
2718 | + if (!squashfs_get_cached_block(s, (char *) | |
2719 | + inodep, block, offset, | |
2720 | + sizeof(*inodep), &next_block, | |
2721 | + &next_offset)) | |
2722 | + goto failed_read; | |
2723 | + | |
2724 | + i->i_mode |= (inodeb->inode_type == | |
2725 | + SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : | |
2726 | + S_IFBLK; | |
2727 | + init_special_inode(i, i->i_mode, | |
2728 | + old_decode_dev(inodep->rdev)); | |
2729 | + | |
2730 | + TRACE("Device inode %x:%x, rdev %x\n", | |
2731 | + SQUASHFS_INODE_BLK(inode), offset, | |
2732 | + inodep->rdev); | |
2733 | + break; | |
2734 | + } | |
2735 | + case SQUASHFS_FIFO_TYPE: | |
2736 | + case SQUASHFS_SOCKET_TYPE: { | |
2737 | + | |
2738 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE) | |
2739 | + ? S_IFIFO : S_IFSOCK; | |
2740 | + init_special_inode(i, i->i_mode, 0); | |
2741 | + break; | |
2742 | + } | |
2743 | + default: | |
2744 | + ERROR("Unknown inode type %d in squashfs_iget!\n", | |
2745 | + inodeb->inode_type); | |
2746 | + goto failed_read1; | |
2747 | + } | |
2748 | + | |
2749 | + return 1; | |
2750 | + | |
2751 | +failed_read: | |
2752 | + ERROR("Unable to read inode [%x:%x]\n", block, offset); | |
2753 | + | |
2754 | +failed_read1: | |
2755 | + return 0; | |
2756 | +} | |
2757 | + | |
2758 | + | |
2759 | +static int get_dir_index_using_offset(struct super_block *s, long long | |
2760 | + *next_block, unsigned int *next_offset, | |
2761 | + long long index_start, | |
2762 | + unsigned int index_offset, int i_count, | |
2763 | + long long f_pos) | |
2764 | +{ | |
2765 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
2766 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2767 | + int i, length = 0; | |
2768 | + struct squashfs_dir_index_2 index; | |
2769 | + | |
2770 | + TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", | |
2771 | + i_count, (unsigned int) f_pos); | |
2772 | + | |
2773 | + if (f_pos == 0) | |
2774 | + goto finish; | |
2775 | + | |
2776 | + for (i = 0; i < i_count; i++) { | |
2777 | + if (msblk->swap) { | |
2778 | + struct squashfs_dir_index_2 sindex; | |
2779 | + squashfs_get_cached_block(s, (char *) &sindex, | |
2780 | + index_start, index_offset, | |
2781 | + sizeof(sindex), &index_start, | |
2782 | + &index_offset); | |
2783 | + SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex); | |
2784 | + } else | |
2785 | + squashfs_get_cached_block(s, (char *) &index, | |
2786 | + index_start, index_offset, | |
2787 | + sizeof(index), &index_start, | |
2788 | + &index_offset); | |
2789 | + | |
2790 | + if (index.index > f_pos) | |
2791 | + break; | |
2792 | + | |
2793 | + squashfs_get_cached_block(s, NULL, index_start, index_offset, | |
2794 | + index.size + 1, &index_start, | |
2795 | + &index_offset); | |
2796 | + | |
2797 | + length = index.index; | |
2798 | + *next_block = index.start_block + sblk->directory_table_start; | |
2799 | + } | |
2800 | + | |
2801 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | |
2802 | + | |
2803 | +finish: | |
2804 | + return length; | |
2805 | +} | |
2806 | + | |
2807 | + | |
2808 | +static int get_dir_index_using_name(struct super_block *s, long long | |
2809 | + *next_block, unsigned int *next_offset, | |
2810 | + long long index_start, | |
2811 | + unsigned int index_offset, int i_count, | |
2812 | + const char *name, int size) | |
2813 | +{ | |
2814 | + struct squashfs_sb_info *msblk = s->s_fs_info; | |
2815 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2816 | + int i, length = 0; | |
2817 | + struct squashfs_dir_index_2 *index; | |
2818 | + char *str; | |
2819 | + | |
2820 | + TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count); | |
2821 | + | |
2822 | + if (!(str = kmalloc(sizeof(struct squashfs_dir_index) + | |
2823 | + (SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL))) { | |
2824 | + ERROR("Failed to allocate squashfs_dir_index\n"); | |
2825 | + goto failure; | |
2826 | + } | |
2827 | + | |
2828 | + index = (struct squashfs_dir_index_2 *) (str + SQUASHFS_NAME_LEN + 1); | |
2829 | + strncpy(str, name, size); | |
2830 | + str[size] = '\0'; | |
2831 | + | |
2832 | + for (i = 0; i < i_count; i++) { | |
2833 | + if (msblk->swap) { | |
2834 | + struct squashfs_dir_index_2 sindex; | |
2835 | + squashfs_get_cached_block(s, (char *) &sindex, | |
2836 | + index_start, index_offset, | |
2837 | + sizeof(sindex), &index_start, | |
2838 | + &index_offset); | |
2839 | + SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex); | |
2840 | + } else | |
2841 | + squashfs_get_cached_block(s, (char *) index, | |
2842 | + index_start, index_offset, | |
2843 | + sizeof(struct squashfs_dir_index_2), | |
2844 | + &index_start, &index_offset); | |
2845 | + | |
2846 | + squashfs_get_cached_block(s, index->name, index_start, | |
2847 | + index_offset, index->size + 1, | |
2848 | + &index_start, &index_offset); | |
2849 | + | |
2850 | + index->name[index->size + 1] = '\0'; | |
2851 | + | |
2852 | + if (strcmp(index->name, str) > 0) | |
2853 | + break; | |
2854 | + | |
2855 | + length = index->index; | |
2856 | + *next_block = index->start_block + sblk->directory_table_start; | |
2857 | + } | |
2858 | + | |
2859 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | |
2860 | + kfree(str); | |
2861 | +failure: | |
2862 | + return length; | |
2863 | +} | |
2864 | + | |
2865 | + | |
2866 | +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir) | |
2867 | +{ | |
2868 | + struct inode *i = file->f_dentry->d_inode; | |
2869 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | |
2870 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2871 | + long long next_block = SQUASHFS_I(i)->start_block + | |
2872 | + sblk->directory_table_start; | |
2873 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, | |
2874 | + dir_count; | |
2875 | + struct squashfs_dir_header_2 dirh; | |
2876 | + struct squashfs_dir_entry_2 *dire; | |
2877 | + | |
2878 | + TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset); | |
2879 | + | |
2880 | + if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) + | |
2881 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) { | |
2882 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | |
2883 | + goto finish; | |
2884 | + } | |
2885 | + | |
2886 | + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, | |
2887 | + SQUASHFS_I(i)->u.s2.directory_index_start, | |
2888 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | |
2889 | + SQUASHFS_I(i)->u.s2.directory_index_count, | |
2890 | + file->f_pos); | |
2891 | + | |
2892 | + while (length < i_size_read(i)) { | |
2893 | + /* read directory header */ | |
2894 | + if (msblk->swap) { | |
2895 | + struct squashfs_dir_header_2 sdirh; | |
2896 | + | |
2897 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, | |
2898 | + next_block, next_offset, sizeof(sdirh), | |
2899 | + &next_block, &next_offset)) | |
2900 | + goto failed_read; | |
2901 | + | |
2902 | + length += sizeof(sdirh); | |
2903 | + SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh); | |
2904 | + } else { | |
2905 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, | |
2906 | + next_block, next_offset, sizeof(dirh), | |
2907 | + &next_block, &next_offset)) | |
2908 | + goto failed_read; | |
2909 | + | |
2910 | + length += sizeof(dirh); | |
2911 | + } | |
2912 | + | |
2913 | + dir_count = dirh.count + 1; | |
2914 | + while (dir_count--) { | |
2915 | + if (msblk->swap) { | |
2916 | + struct squashfs_dir_entry_2 sdire; | |
2917 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | |
2918 | + &sdire, next_block, next_offset, | |
2919 | + sizeof(sdire), &next_block, | |
2920 | + &next_offset)) | |
2921 | + goto failed_read; | |
2922 | + | |
2923 | + length += sizeof(sdire); | |
2924 | + SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire); | |
2925 | + } else { | |
2926 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | |
2927 | + dire, next_block, next_offset, | |
2928 | + sizeof(*dire), &next_block, | |
2929 | + &next_offset)) | |
2930 | + goto failed_read; | |
2931 | + | |
2932 | + length += sizeof(*dire); | |
2933 | + } | |
2934 | + | |
2935 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, | |
2936 | + next_block, next_offset, | |
2937 | + dire->size + 1, &next_block, | |
2938 | + &next_offset)) | |
2939 | + goto failed_read; | |
2940 | + | |
2941 | + length += dire->size + 1; | |
2942 | + | |
2943 | + if (file->f_pos >= length) | |
2944 | + continue; | |
2945 | + | |
2946 | + dire->name[dire->size + 1] = '\0'; | |
2947 | + | |
2948 | + TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n", | |
2949 | + (unsigned int) dirent, dire->name, | |
2950 | + dire->size + 1, (int) file->f_pos, | |
2951 | + dirh.start_block, dire->offset, | |
2952 | + squashfs_filetype_table[dire->type]); | |
2953 | + | |
2954 | + if (filldir(dirent, dire->name, dire->size + 1, | |
2955 | + file->f_pos, SQUASHFS_MK_VFS_INODE( | |
2956 | + dirh.start_block, dire->offset), | |
2957 | + squashfs_filetype_table[dire->type]) | |
2958 | + < 0) { | |
2959 | + TRACE("Filldir returned less than 0\n"); | |
2960 | + goto finish; | |
2961 | + } | |
2962 | + file->f_pos = length; | |
2963 | + } | |
2964 | + } | |
2965 | + | |
2966 | +finish: | |
2967 | + kfree(dire); | |
2968 | + return 0; | |
2969 | + | |
2970 | +failed_read: | |
2971 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | |
2972 | + next_offset); | |
2973 | + kfree(dire); | |
2974 | + return 0; | |
2975 | +} | |
2976 | + | |
2977 | + | |
2978 | +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry, | |
2979 | + struct nameidata *nd) | |
2980 | +{ | |
2981 | + const unsigned char *name = dentry->d_name.name; | |
2982 | + int len = dentry->d_name.len; | |
2983 | + struct inode *inode = NULL; | |
2984 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | |
2985 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
2986 | + long long next_block = SQUASHFS_I(i)->start_block + | |
2987 | + sblk->directory_table_start; | |
2988 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, | |
2989 | + dir_count; | |
2990 | + struct squashfs_dir_header_2 dirh; | |
2991 | + struct squashfs_dir_entry_2 *dire; | |
2992 | + int sorted = sblk->s_major == 2 && sblk->s_minor >= 1; | |
2993 | + | |
2994 | + TRACE("Entered squashfs_lookup_2 [%llx:%x]\n", next_block, next_offset); | |
2995 | + | |
2996 | + if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) + | |
2997 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) { | |
2998 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | |
2999 | + goto exit_loop; | |
3000 | + } | |
3001 | + | |
3002 | + if (len > SQUASHFS_NAME_LEN) | |
3003 | + goto exit_loop; | |
3004 | + | |
3005 | + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, | |
3006 | + SQUASHFS_I(i)->u.s2.directory_index_start, | |
3007 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | |
3008 | + SQUASHFS_I(i)->u.s2.directory_index_count, name, | |
3009 | + len); | |
3010 | + | |
3011 | + while (length < i_size_read(i)) { | |
3012 | + /* read directory header */ | |
3013 | + if (msblk->swap) { | |
3014 | + struct squashfs_dir_header_2 sdirh; | |
3015 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, | |
3016 | + next_block, next_offset, sizeof(sdirh), | |
3017 | + &next_block, &next_offset)) | |
3018 | + goto failed_read; | |
3019 | + | |
3020 | + length += sizeof(sdirh); | |
3021 | + SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh); | |
3022 | + } else { | |
3023 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, | |
3024 | + next_block, next_offset, sizeof(dirh), | |
3025 | + &next_block, &next_offset)) | |
3026 | + goto failed_read; | |
3027 | + | |
3028 | + length += sizeof(dirh); | |
3029 | + } | |
3030 | + | |
3031 | + dir_count = dirh.count + 1; | |
3032 | + while (dir_count--) { | |
3033 | + if (msblk->swap) { | |
3034 | + struct squashfs_dir_entry_2 sdire; | |
3035 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | |
3036 | + &sdire, next_block,next_offset, | |
3037 | + sizeof(sdire), &next_block, | |
3038 | + &next_offset)) | |
3039 | + goto failed_read; | |
3040 | + | |
3041 | + length += sizeof(sdire); | |
3042 | + SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire); | |
3043 | + } else { | |
3044 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | |
3045 | + dire, next_block,next_offset, | |
3046 | + sizeof(*dire), &next_block, | |
3047 | + &next_offset)) | |
3048 | + goto failed_read; | |
3049 | + | |
3050 | + length += sizeof(*dire); | |
3051 | + } | |
3052 | + | |
3053 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, | |
3054 | + next_block, next_offset, dire->size + 1, | |
3055 | + &next_block, &next_offset)) | |
3056 | + goto failed_read; | |
3057 | + | |
3058 | + length += dire->size + 1; | |
3059 | + | |
3060 | + if (sorted && name[0] < dire->name[0]) | |
3061 | + goto exit_loop; | |
3062 | + | |
3063 | + if ((len == dire->size + 1) && !strncmp(name, | |
3064 | + dire->name, len)) { | |
3065 | + squashfs_inode_t ino = | |
3066 | + SQUASHFS_MKINODE(dirh.start_block, | |
3067 | + dire->offset); | |
3068 | + unsigned int inode_number = SQUASHFS_MK_VFS_INODE(dirh.start_block, | |
3069 | + dire->offset); | |
3070 | + | |
3071 | + TRACE("calling squashfs_iget for directory " | |
3072 | + "entry %s, inode %x:%x, %lld\n", name, | |
3073 | + dirh.start_block, dire->offset, ino); | |
3074 | + | |
3075 | + inode = squashfs_iget(i->i_sb, ino, inode_number); | |
3076 | + | |
3077 | + goto exit_loop; | |
3078 | + } | |
3079 | + } | |
3080 | + } | |
3081 | + | |
3082 | +exit_loop: | |
3083 | + kfree(dire); | |
3084 | + d_add(dentry, inode); | |
3085 | + return ERR_PTR(0); | |
3086 | + | |
3087 | +failed_read: | |
3088 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | |
3089 | + next_offset); | |
3090 | + goto exit_loop; | |
3091 | +} | |
3092 | + | |
3093 | + | |
3094 | +int squashfs_2_0_supported(struct squashfs_sb_info *msblk) | |
3095 | +{ | |
3096 | + struct squashfs_super_block *sblk = &msblk->sblk; | |
3097 | + | |
3098 | + msblk->read_inode = squashfs_read_inode_2; | |
3099 | + msblk->read_fragment_index_table = read_fragment_index_table_2; | |
3100 | + | |
3101 | + sblk->bytes_used = sblk->bytes_used_2; | |
3102 | + sblk->uid_start = sblk->uid_start_2; | |
3103 | + sblk->guid_start = sblk->guid_start_2; | |
3104 | + sblk->inode_table_start = sblk->inode_table_start_2; | |
3105 | + sblk->directory_table_start = sblk->directory_table_start_2; | |
3106 | + sblk->fragment_table_start = sblk->fragment_table_start_2; | |
3107 | + | |
3108 | + return 1; | |
3109 | +} | |
3110 | --- /dev/null | |
3111 | +++ b/include/linux/squashfs_fs.h | |
3112 | @@ -0,0 +1,935 @@ | |
3113 | +#ifndef SQUASHFS_FS | |
3114 | +#define SQUASHFS_FS | |
3115 | + | |
3116 | +/* | |
3117 | + * Squashfs | |
3118 | + * | |
3119 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
3120 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | |
3121 | + * | |
3122 | + * This program is free software; you can redistribute it and/or | |
3123 | + * modify it under the terms of the GNU General Public License | |
3124 | + * as published by the Free Software Foundation; either version 2, | |
3125 | + * or (at your option) any later version. | |
3126 | + * | |
3127 | + * This program is distributed in the hope that it will be useful, | |
3128 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3129 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3130 | + * GNU General Public License for more details. | |
3131 | + * | |
3132 | + * You should have received a copy of the GNU General Public License | |
3133 | + * along with this program; if not, write to the Free Software | |
3134 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
3135 | + * | |
3136 | + * squashfs_fs.h | |
3137 | + */ | |
3138 | + | |
3139 | +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY | |
3140 | +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY | |
3141 | +#endif | |
3142 | + | |
3143 | +#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE | |
3144 | +#define SQUASHFS_MAJOR 3 | |
3145 | +#define SQUASHFS_MINOR 1 | |
3146 | +#define SQUASHFS_MAGIC 0x73717368 | |
3147 | +#define SQUASHFS_MAGIC_SWAP 0x68737173 | |
3148 | +#define SQUASHFS_START 0 | |
3149 | + | |
3150 | +/* size of metadata (inode and directory) blocks */ | |
3151 | +#define SQUASHFS_METADATA_SIZE 8192 | |
3152 | +#define SQUASHFS_METADATA_LOG 13 | |
3153 | + | |
3154 | +/* default size of data blocks */ | |
3155 | +#define SQUASHFS_FILE_SIZE 131072 | |
3156 | +#define SQUASHFS_FILE_LOG 17 | |
3157 | + | |
3158 | +#define SQUASHFS_FILE_MAX_SIZE 1048576 | |
3159 | + | |
3160 | +/* Max number of uids and gids */ | |
3161 | +#define SQUASHFS_UIDS 256 | |
3162 | +#define SQUASHFS_GUIDS 255 | |
3163 | + | |
3164 | +/* Max length of filename (not 255) */ | |
3165 | +#define SQUASHFS_NAME_LEN 256 | |
3166 | + | |
3167 | +#define SQUASHFS_INVALID ((long long) 0xffffffffffff) | |
3168 | +#define SQUASHFS_INVALID_FRAG ((unsigned int) 0xffffffff) | |
3169 | +#define SQUASHFS_INVALID_BLK ((long long) -1) | |
3170 | +#define SQUASHFS_USED_BLK ((long long) -2) | |
3171 | + | |
3172 | +/* Filesystem flags */ | |
3173 | +#define SQUASHFS_NOI 0 | |
3174 | +#define SQUASHFS_NOD 1 | |
3175 | +#define SQUASHFS_CHECK 2 | |
3176 | +#define SQUASHFS_NOF 3 | |
3177 | +#define SQUASHFS_NO_FRAG 4 | |
3178 | +#define SQUASHFS_ALWAYS_FRAG 5 | |
3179 | +#define SQUASHFS_DUPLICATE 6 | |
3180 | +#define SQUASHFS_EXPORT 7 | |
3181 | + | |
3182 | +#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1) | |
3183 | + | |
3184 | +#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \ | |
3185 | + SQUASHFS_NOI) | |
3186 | + | |
3187 | +#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \ | |
3188 | + SQUASHFS_NOD) | |
3189 | + | |
3190 | +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ | |
3191 | + SQUASHFS_NOF) | |
3192 | + | |
3193 | +#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ | |
3194 | + SQUASHFS_NO_FRAG) | |
3195 | + | |
3196 | +#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ | |
3197 | + SQUASHFS_ALWAYS_FRAG) | |
3198 | + | |
3199 | +#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \ | |
3200 | + SQUASHFS_DUPLICATE) | |
3201 | + | |
3202 | +#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \ | |
3203 | + SQUASHFS_EXPORT) | |
3204 | + | |
3205 | +#define SQUASHFS_CHECK_DATA(flags) SQUASHFS_BIT(flags, \ | |
3206 | + SQUASHFS_CHECK) | |
3207 | + | |
3208 | +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \ | |
3209 | + duplicate_checking, exportable) (noi | (nod << 1) | (check_data << 2) \ | |
3210 | + | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \ | |
3211 | + (duplicate_checking << 6) | (exportable << 7)) | |
3212 | + | |
3213 | +/* Max number of types and file types */ | |
3214 | +#define SQUASHFS_DIR_TYPE 1 | |
3215 | +#define SQUASHFS_FILE_TYPE 2 | |
3216 | +#define SQUASHFS_SYMLINK_TYPE 3 | |
3217 | +#define SQUASHFS_BLKDEV_TYPE 4 | |
3218 | +#define SQUASHFS_CHRDEV_TYPE 5 | |
3219 | +#define SQUASHFS_FIFO_TYPE 6 | |
3220 | +#define SQUASHFS_SOCKET_TYPE 7 | |
3221 | +#define SQUASHFS_LDIR_TYPE 8 | |
3222 | +#define SQUASHFS_LREG_TYPE 9 | |
3223 | + | |
3224 | +/* 1.0 filesystem type definitions */ | |
3225 | +#define SQUASHFS_TYPES 5 | |
3226 | +#define SQUASHFS_IPC_TYPE 0 | |
3227 | + | |
3228 | +/* Flag whether block is compressed or uncompressed, bit is set if block is | |
3229 | + * uncompressed */ | |
3230 | +#define SQUASHFS_COMPRESSED_BIT (1 << 15) | |
3231 | + | |
3232 | +#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \ | |
3233 | + (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT) | |
3234 | + | |
3235 | +#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT)) | |
3236 | + | |
3237 | +#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24) | |
3238 | + | |
3239 | +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \ | |
3240 | + ~SQUASHFS_COMPRESSED_BIT_BLOCK) | |
3241 | + | |
3242 | +#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK)) | |
3243 | + | |
3244 | +/* | |
3245 | + * Inode number ops. Inodes consist of a compressed block number, and an | |
3246 | + * uncompressed offset within that block | |
3247 | + */ | |
3248 | +#define SQUASHFS_INODE_BLK(a) ((unsigned int) ((a) >> 16)) | |
3249 | + | |
3250 | +#define SQUASHFS_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff)) | |
3251 | + | |
3252 | +#define SQUASHFS_MKINODE(A, B) ((squashfs_inode_t)(((squashfs_inode_t) (A)\ | |
3253 | + << 16) + (B))) | |
3254 | + | |
3255 | +/* Compute 32 bit VFS inode number from squashfs inode number */ | |
3256 | +#define SQUASHFS_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \ | |
3257 | + ((b) >> 2) + 1)) | |
3258 | +/* XXX */ | |
3259 | + | |
3260 | +/* Translate between VFS mode and squashfs mode */ | |
3261 | +#define SQUASHFS_MODE(a) ((a) & 0xfff) | |
3262 | + | |
3263 | +/* fragment and fragment table defines */ | |
3264 | +#define SQUASHFS_FRAGMENT_BYTES(A) ((A) * sizeof(struct squashfs_fragment_entry)) | |
3265 | + | |
3266 | +#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \ | |
3267 | + SQUASHFS_METADATA_SIZE) | |
3268 | + | |
3269 | +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \ | |
3270 | + SQUASHFS_METADATA_SIZE) | |
3271 | + | |
3272 | +#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \ | |
3273 | + SQUASHFS_METADATA_SIZE - 1) / \ | |
3274 | + SQUASHFS_METADATA_SIZE) | |
3275 | + | |
3276 | +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\ | |
3277 | + sizeof(long long)) | |
3278 | + | |
3279 | +/* inode lookup table defines */ | |
3280 | +#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(squashfs_inode_t)) | |
3281 | + | |
3282 | +#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \ | |
3283 | + SQUASHFS_METADATA_SIZE) | |
3284 | + | |
3285 | +#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \ | |
3286 | + SQUASHFS_METADATA_SIZE) | |
3287 | + | |
3288 | +#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \ | |
3289 | + SQUASHFS_METADATA_SIZE - 1) / \ | |
3290 | + SQUASHFS_METADATA_SIZE) | |
3291 | + | |
3292 | +#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\ | |
3293 | + sizeof(long long)) | |
3294 | + | |
3295 | +/* cached data constants for filesystem */ | |
3296 | +#define SQUASHFS_CACHED_BLKS 8 | |
3297 | + | |
3298 | +#define SQUASHFS_MAX_FILE_SIZE_LOG 64 | |
3299 | + | |
3300 | +#define SQUASHFS_MAX_FILE_SIZE ((long long) 1 << \ | |
3301 | + (SQUASHFS_MAX_FILE_SIZE_LOG - 2)) | |
3302 | + | |
3303 | +#define SQUASHFS_MARKER_BYTE 0xff | |
3304 | + | |
3305 | +/* meta index cache */ | |
3306 | +#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int)) | |
3307 | +#define SQUASHFS_META_ENTRIES 31 | |
3308 | +#define SQUASHFS_META_NUMBER 8 | |
3309 | +#define SQUASHFS_SLOTS 4 | |
3310 | + | |
3311 | +struct meta_entry { | |
3312 | + long long data_block; | |
3313 | + unsigned int index_block; | |
3314 | + unsigned short offset; | |
3315 | + unsigned short pad; | |
3316 | +}; | |
3317 | + | |
3318 | +struct meta_index { | |
3319 | + unsigned int inode_number; | |
3320 | + unsigned int offset; | |
3321 | + unsigned short entries; | |
3322 | + unsigned short skip; | |
3323 | + unsigned short locked; | |
3324 | + unsigned short pad; | |
3325 | + struct meta_entry meta_entry[SQUASHFS_META_ENTRIES]; | |
3326 | +}; | |
3327 | + | |
3328 | + | |
3329 | +/* | |
3330 | + * definitions for structures on disk | |
3331 | + */ | |
3332 | + | |
3333 | +typedef long long squashfs_block_t; | |
3334 | +typedef long long squashfs_inode_t; | |
3335 | + | |
3336 | +struct squashfs_super_block { | |
3337 | + unsigned int s_magic; | |
3338 | + unsigned int inodes; | |
3339 | + unsigned int bytes_used_2; | |
3340 | + unsigned int uid_start_2; | |
3341 | + unsigned int guid_start_2; | |
3342 | + unsigned int inode_table_start_2; | |
3343 | + unsigned int directory_table_start_2; | |
3344 | + unsigned int s_major:16; | |
3345 | + unsigned int s_minor:16; | |
3346 | + unsigned int block_size_1:16; | |
3347 | + unsigned int block_log:16; | |
3348 | + unsigned int flags:8; | |
3349 | + unsigned int no_uids:8; | |
3350 | + unsigned int no_guids:8; | |
3351 | + unsigned int mkfs_time /* time of filesystem creation */; | |
3352 | + squashfs_inode_t root_inode; | |
3353 | + unsigned int block_size; | |
3354 | + unsigned int fragments; | |
3355 | + unsigned int fragment_table_start_2; | |
3356 | + long long bytes_used; | |
3357 | + long long uid_start; | |
3358 | + long long guid_start; | |
3359 | + long long inode_table_start; | |
3360 | + long long directory_table_start; | |
3361 | + long long fragment_table_start; | |
3362 | + long long lookup_table_start; | |
3363 | +} __attribute__ ((packed)); | |
3364 | + | |
3365 | +struct squashfs_dir_index { | |
3366 | + unsigned int index; | |
3367 | + unsigned int start_block; | |
3368 | + unsigned char size; | |
3369 | + unsigned char name[0]; | |
3370 | +} __attribute__ ((packed)); | |
3371 | + | |
3372 | +#define SQUASHFS_BASE_INODE_HEADER \ | |
3373 | + unsigned int inode_type:4; \ | |
3374 | + unsigned int mode:12; \ | |
3375 | + unsigned int uid:8; \ | |
3376 | + unsigned int guid:8; \ | |
3377 | + unsigned int mtime; \ | |
3378 | + unsigned int inode_number; | |
3379 | + | |
3380 | +struct squashfs_base_inode_header { | |
3381 | + SQUASHFS_BASE_INODE_HEADER; | |
3382 | +} __attribute__ ((packed)); | |
3383 | + | |
3384 | +struct squashfs_ipc_inode_header { | |
3385 | + SQUASHFS_BASE_INODE_HEADER; | |
3386 | + unsigned int nlink; | |
3387 | +} __attribute__ ((packed)); | |
3388 | + | |
3389 | +struct squashfs_dev_inode_header { | |
3390 | + SQUASHFS_BASE_INODE_HEADER; | |
3391 | + unsigned int nlink; | |
3392 | + unsigned short rdev; | |
3393 | +} __attribute__ ((packed)); | |
3394 | + | |
3395 | +struct squashfs_symlink_inode_header { | |
3396 | + SQUASHFS_BASE_INODE_HEADER; | |
3397 | + unsigned int nlink; | |
3398 | + unsigned short symlink_size; | |
3399 | + char symlink[0]; | |
3400 | +} __attribute__ ((packed)); | |
3401 | + | |
3402 | +struct squashfs_reg_inode_header { | |
3403 | + SQUASHFS_BASE_INODE_HEADER; | |
3404 | + squashfs_block_t start_block; | |
3405 | + unsigned int fragment; | |
3406 | + unsigned int offset; | |
3407 | + unsigned int file_size; | |
3408 | + unsigned short block_list[0]; | |
3409 | +} __attribute__ ((packed)); | |
3410 | + | |
3411 | +struct squashfs_lreg_inode_header { | |
3412 | + SQUASHFS_BASE_INODE_HEADER; | |
3413 | + unsigned int nlink; | |
3414 | + squashfs_block_t start_block; | |
3415 | + unsigned int fragment; | |
3416 | + unsigned int offset; | |
3417 | + long long file_size; | |
3418 | + unsigned short block_list[0]; | |
3419 | +} __attribute__ ((packed)); | |
3420 | + | |
3421 | +struct squashfs_dir_inode_header { | |
3422 | + SQUASHFS_BASE_INODE_HEADER; | |
3423 | + unsigned int nlink; | |
3424 | + unsigned int file_size:19; | |
3425 | + unsigned int offset:13; | |
3426 | + unsigned int start_block; | |
3427 | + unsigned int parent_inode; | |
3428 | +} __attribute__ ((packed)); | |
3429 | + | |
3430 | +struct squashfs_ldir_inode_header { | |
3431 | + SQUASHFS_BASE_INODE_HEADER; | |
3432 | + unsigned int nlink; | |
3433 | + unsigned int file_size:27; | |
3434 | + unsigned int offset:13; | |
3435 | + unsigned int start_block; | |
3436 | + unsigned int i_count:16; | |
3437 | + unsigned int parent_inode; | |
3438 | + struct squashfs_dir_index index[0]; | |
3439 | +} __attribute__ ((packed)); | |
3440 | + | |
3441 | +union squashfs_inode_header { | |
3442 | + struct squashfs_base_inode_header base; | |
3443 | + struct squashfs_dev_inode_header dev; | |
3444 | + struct squashfs_symlink_inode_header symlink; | |
3445 | + struct squashfs_reg_inode_header reg; | |
3446 | + struct squashfs_lreg_inode_header lreg; | |
3447 | + struct squashfs_dir_inode_header dir; | |
3448 | + struct squashfs_ldir_inode_header ldir; | |
3449 | + struct squashfs_ipc_inode_header ipc; | |
3450 | +}; | |
3451 | + | |
3452 | +struct squashfs_dir_entry { | |
3453 | + unsigned int offset:13; | |
3454 | + unsigned int type:3; | |
3455 | + unsigned int size:8; | |
3456 | + int inode_number:16; | |
3457 | + char name[0]; | |
3458 | +} __attribute__ ((packed)); | |
3459 | + | |
3460 | +struct squashfs_dir_header { | |
3461 | + unsigned int count:8; | |
3462 | + unsigned int start_block; | |
3463 | + unsigned int inode_number; | |
3464 | +} __attribute__ ((packed)); | |
3465 | + | |
3466 | +struct squashfs_fragment_entry { | |
3467 | + long long start_block; | |
3468 | + unsigned int size; | |
3469 | + unsigned int unused; | |
3470 | +} __attribute__ ((packed)); | |
3471 | + | |
3472 | +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen); | |
3473 | +extern int squashfs_uncompress_init(void); | |
3474 | +extern int squashfs_uncompress_exit(void); | |
3475 | + | |
3476 | +/* | |
3477 | + * macros to convert each packed bitfield structure from little endian to big | |
3478 | + * endian and vice versa. These are needed when creating or using a filesystem | |
3479 | + * on a machine with different byte ordering to the target architecture. | |
3480 | + * | |
3481 | + */ | |
3482 | + | |
3483 | +#define SQUASHFS_SWAP_START \ | |
3484 | + int bits;\ | |
3485 | + int b_pos;\ | |
3486 | + unsigned long long val;\ | |
3487 | + unsigned char *s;\ | |
3488 | + unsigned char *d; | |
3489 | + | |
3490 | +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\ | |
3491 | + SQUASHFS_SWAP_START\ | |
3492 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\ | |
3493 | + SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\ | |
3494 | + SQUASHFS_SWAP((s)->inodes, d, 32, 32);\ | |
3495 | + SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\ | |
3496 | + SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\ | |
3497 | + SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\ | |
3498 | + SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\ | |
3499 | + SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\ | |
3500 | + SQUASHFS_SWAP((s)->s_major, d, 224, 16);\ | |
3501 | + SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\ | |
3502 | + SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\ | |
3503 | + SQUASHFS_SWAP((s)->block_log, d, 272, 16);\ | |
3504 | + SQUASHFS_SWAP((s)->flags, d, 288, 8);\ | |
3505 | + SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\ | |
3506 | + SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\ | |
3507 | + SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\ | |
3508 | + SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\ | |
3509 | + SQUASHFS_SWAP((s)->block_size, d, 408, 32);\ | |
3510 | + SQUASHFS_SWAP((s)->fragments, d, 440, 32);\ | |
3511 | + SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\ | |
3512 | + SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\ | |
3513 | + SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\ | |
3514 | + SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\ | |
3515 | + SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\ | |
3516 | + SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\ | |
3517 | + SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\ | |
3518 | + SQUASHFS_SWAP((s)->lookup_table_start, d, 888, 64);\ | |
3519 | +} | |
3520 | + | |
3521 | +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\ | |
3522 | + SQUASHFS_MEMSET(s, d, n);\ | |
3523 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ | |
3524 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ | |
3525 | + SQUASHFS_SWAP((s)->uid, d, 16, 8);\ | |
3526 | + SQUASHFS_SWAP((s)->guid, d, 24, 8);\ | |
3527 | + SQUASHFS_SWAP((s)->mtime, d, 32, 32);\ | |
3528 | + SQUASHFS_SWAP((s)->inode_number, d, 64, 32); | |
3529 | + | |
3530 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\ | |
3531 | + SQUASHFS_SWAP_START\ | |
3532 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\ | |
3533 | +} | |
3534 | + | |
3535 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\ | |
3536 | + SQUASHFS_SWAP_START\ | |
3537 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3538 | + sizeof(struct squashfs_ipc_inode_header))\ | |
3539 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | |
3540 | +} | |
3541 | + | |
3542 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\ | |
3543 | + SQUASHFS_SWAP_START\ | |
3544 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3545 | + sizeof(struct squashfs_dev_inode_header)); \ | |
3546 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | |
3547 | + SQUASHFS_SWAP((s)->rdev, d, 128, 16);\ | |
3548 | +} | |
3549 | + | |
3550 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\ | |
3551 | + SQUASHFS_SWAP_START\ | |
3552 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3553 | + sizeof(struct squashfs_symlink_inode_header));\ | |
3554 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | |
3555 | + SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\ | |
3556 | +} | |
3557 | + | |
3558 | +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\ | |
3559 | + SQUASHFS_SWAP_START\ | |
3560 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3561 | + sizeof(struct squashfs_reg_inode_header));\ | |
3562 | + SQUASHFS_SWAP((s)->start_block, d, 96, 64);\ | |
3563 | + SQUASHFS_SWAP((s)->fragment, d, 160, 32);\ | |
3564 | + SQUASHFS_SWAP((s)->offset, d, 192, 32);\ | |
3565 | + SQUASHFS_SWAP((s)->file_size, d, 224, 32);\ | |
3566 | +} | |
3567 | + | |
3568 | +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\ | |
3569 | + SQUASHFS_SWAP_START\ | |
3570 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3571 | + sizeof(struct squashfs_lreg_inode_header));\ | |
3572 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | |
3573 | + SQUASHFS_SWAP((s)->start_block, d, 128, 64);\ | |
3574 | + SQUASHFS_SWAP((s)->fragment, d, 192, 32);\ | |
3575 | + SQUASHFS_SWAP((s)->offset, d, 224, 32);\ | |
3576 | + SQUASHFS_SWAP((s)->file_size, d, 256, 64);\ | |
3577 | +} | |
3578 | + | |
3579 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\ | |
3580 | + SQUASHFS_SWAP_START\ | |
3581 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3582 | + sizeof(struct squashfs_dir_inode_header));\ | |
3583 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | |
3584 | + SQUASHFS_SWAP((s)->file_size, d, 128, 19);\ | |
3585 | + SQUASHFS_SWAP((s)->offset, d, 147, 13);\ | |
3586 | + SQUASHFS_SWAP((s)->start_block, d, 160, 32);\ | |
3587 | + SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\ | |
3588 | +} | |
3589 | + | |
3590 | +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\ | |
3591 | + SQUASHFS_SWAP_START\ | |
3592 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | |
3593 | + sizeof(struct squashfs_ldir_inode_header));\ | |
3594 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | |
3595 | + SQUASHFS_SWAP((s)->file_size, d, 128, 27);\ | |
3596 | + SQUASHFS_SWAP((s)->offset, d, 155, 13);\ | |
3597 | + SQUASHFS_SWAP((s)->start_block, d, 168, 32);\ | |
3598 | + SQUASHFS_SWAP((s)->i_count, d, 200, 16);\ | |
3599 | + SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\ | |
3600 | +} | |
3601 | + | |
3602 | +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\ | |
3603 | + SQUASHFS_SWAP_START\ | |
3604 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\ | |
3605 | + SQUASHFS_SWAP((s)->index, d, 0, 32);\ | |
3606 | + SQUASHFS_SWAP((s)->start_block, d, 32, 32);\ | |
3607 | + SQUASHFS_SWAP((s)->size, d, 64, 8);\ | |
3608 | +} | |
3609 | + | |
3610 | +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\ | |
3611 | + SQUASHFS_SWAP_START\ | |
3612 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\ | |
3613 | + SQUASHFS_SWAP((s)->count, d, 0, 8);\ | |
3614 | + SQUASHFS_SWAP((s)->start_block, d, 8, 32);\ | |
3615 | + SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\ | |
3616 | +} | |
3617 | + | |
3618 | +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\ | |
3619 | + SQUASHFS_SWAP_START\ | |
3620 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\ | |
3621 | + SQUASHFS_SWAP((s)->offset, d, 0, 13);\ | |
3622 | + SQUASHFS_SWAP((s)->type, d, 13, 3);\ | |
3623 | + SQUASHFS_SWAP((s)->size, d, 16, 8);\ | |
3624 | + SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\ | |
3625 | +} | |
3626 | + | |
3627 | +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\ | |
3628 | + SQUASHFS_SWAP_START\ | |
3629 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\ | |
3630 | + SQUASHFS_SWAP((s)->start_block, d, 0, 64);\ | |
3631 | + SQUASHFS_SWAP((s)->size, d, 64, 32);\ | |
3632 | +} | |
3633 | + | |
3634 | +#define SQUASHFS_SWAP_INODE_T(s, d) SQUASHFS_SWAP_LONG_LONGS(s, d, 1) | |
3635 | + | |
3636 | +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\ | |
3637 | + int entry;\ | |
3638 | + int bit_position;\ | |
3639 | + SQUASHFS_SWAP_START\ | |
3640 | + SQUASHFS_MEMSET(s, d, n * 2);\ | |
3641 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | |
3642 | + 16)\ | |
3643 | + SQUASHFS_SWAP(s[entry], d, bit_position, 16);\ | |
3644 | +} | |
3645 | + | |
3646 | +#define SQUASHFS_SWAP_INTS(s, d, n) {\ | |
3647 | + int entry;\ | |
3648 | + int bit_position;\ | |
3649 | + SQUASHFS_SWAP_START\ | |
3650 | + SQUASHFS_MEMSET(s, d, n * 4);\ | |
3651 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | |
3652 | + 32)\ | |
3653 | + SQUASHFS_SWAP(s[entry], d, bit_position, 32);\ | |
3654 | +} | |
3655 | + | |
3656 | +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\ | |
3657 | + int entry;\ | |
3658 | + int bit_position;\ | |
3659 | + SQUASHFS_SWAP_START\ | |
3660 | + SQUASHFS_MEMSET(s, d, n * 8);\ | |
3661 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | |
3662 | + 64)\ | |
3663 | + SQUASHFS_SWAP(s[entry], d, bit_position, 64);\ | |
3664 | +} | |
3665 | + | |
3666 | +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\ | |
3667 | + int entry;\ | |
3668 | + int bit_position;\ | |
3669 | + SQUASHFS_SWAP_START\ | |
3670 | + SQUASHFS_MEMSET(s, d, n * bits / 8);\ | |
3671 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | |
3672 | + bits)\ | |
3673 | + SQUASHFS_SWAP(s[entry], d, bit_position, bits);\ | |
3674 | +} | |
3675 | + | |
3676 | +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n) | |
3677 | +#define SQUASHFS_SWAP_LOOKUP_BLOCKS(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n) | |
3678 | + | |
3679 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY | |
3680 | + | |
3681 | +struct squashfs_base_inode_header_1 { | |
3682 | + unsigned int inode_type:4; | |
3683 | + unsigned int mode:12; /* protection */ | |
3684 | + unsigned int uid:4; /* index into uid table */ | |
3685 | + unsigned int guid:4; /* index into guid table */ | |
3686 | +} __attribute__ ((packed)); | |
3687 | + | |
3688 | +struct squashfs_ipc_inode_header_1 { | |
3689 | + unsigned int inode_type:4; | |
3690 | + unsigned int mode:12; /* protection */ | |
3691 | + unsigned int uid:4; /* index into uid table */ | |
3692 | + unsigned int guid:4; /* index into guid table */ | |
3693 | + unsigned int type:4; | |
3694 | + unsigned int offset:4; | |
3695 | +} __attribute__ ((packed)); | |
3696 | + | |
3697 | +struct squashfs_dev_inode_header_1 { | |
3698 | + unsigned int inode_type:4; | |
3699 | + unsigned int mode:12; /* protection */ | |
3700 | + unsigned int uid:4; /* index into uid table */ | |
3701 | + unsigned int guid:4; /* index into guid table */ | |
3702 | + unsigned short rdev; | |
3703 | +} __attribute__ ((packed)); | |
3704 | + | |
3705 | +struct squashfs_symlink_inode_header_1 { | |
3706 | + unsigned int inode_type:4; | |
3707 | + unsigned int mode:12; /* protection */ | |
3708 | + unsigned int uid:4; /* index into uid table */ | |
3709 | + unsigned int guid:4; /* index into guid table */ | |
3710 | + unsigned short symlink_size; | |
3711 | + char symlink[0]; | |
3712 | +} __attribute__ ((packed)); | |
3713 | + | |
3714 | +struct squashfs_reg_inode_header_1 { | |
3715 | + unsigned int inode_type:4; | |
3716 | + unsigned int mode:12; /* protection */ | |
3717 | + unsigned int uid:4; /* index into uid table */ | |
3718 | + unsigned int guid:4; /* index into guid table */ | |
3719 | + unsigned int mtime; | |
3720 | + unsigned int start_block; | |
3721 | + unsigned int file_size:32; | |
3722 | + unsigned short block_list[0]; | |
3723 | +} __attribute__ ((packed)); | |
3724 | + | |
3725 | +struct squashfs_dir_inode_header_1 { | |
3726 | + unsigned int inode_type:4; | |
3727 | + unsigned int mode:12; /* protection */ | |
3728 | + unsigned int uid:4; /* index into uid table */ | |
3729 | + unsigned int guid:4; /* index into guid table */ | |
3730 | + unsigned int file_size:19; | |
3731 | + unsigned int offset:13; | |
3732 | + unsigned int mtime; | |
3733 | + unsigned int start_block:24; | |
3734 | +} __attribute__ ((packed)); | |
3735 | + | |
3736 | +union squashfs_inode_header_1 { | |
3737 | + struct squashfs_base_inode_header_1 base; | |
3738 | + struct squashfs_dev_inode_header_1 dev; | |
3739 | + struct squashfs_symlink_inode_header_1 symlink; | |
3740 | + struct squashfs_reg_inode_header_1 reg; | |
3741 | + struct squashfs_dir_inode_header_1 dir; | |
3742 | + struct squashfs_ipc_inode_header_1 ipc; | |
3743 | +}; | |
3744 | + | |
3745 | +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \ | |
3746 | + SQUASHFS_MEMSET(s, d, n);\ | |
3747 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ | |
3748 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ | |
3749 | + SQUASHFS_SWAP((s)->uid, d, 16, 4);\ | |
3750 | + SQUASHFS_SWAP((s)->guid, d, 20, 4); | |
3751 | + | |
3752 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\ | |
3753 | + SQUASHFS_SWAP_START\ | |
3754 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\ | |
3755 | +} | |
3756 | + | |
3757 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\ | |
3758 | + SQUASHFS_SWAP_START\ | |
3759 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | |
3760 | + sizeof(struct squashfs_ipc_inode_header_1));\ | |
3761 | + SQUASHFS_SWAP((s)->type, d, 24, 4);\ | |
3762 | + SQUASHFS_SWAP((s)->offset, d, 28, 4);\ | |
3763 | +} | |
3764 | + | |
3765 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\ | |
3766 | + SQUASHFS_SWAP_START\ | |
3767 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | |
3768 | + sizeof(struct squashfs_dev_inode_header_1));\ | |
3769 | + SQUASHFS_SWAP((s)->rdev, d, 24, 16);\ | |
3770 | +} | |
3771 | + | |
3772 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\ | |
3773 | + SQUASHFS_SWAP_START\ | |
3774 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | |
3775 | + sizeof(struct squashfs_symlink_inode_header_1));\ | |
3776 | + SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\ | |
3777 | +} | |
3778 | + | |
3779 | +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\ | |
3780 | + SQUASHFS_SWAP_START\ | |
3781 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | |
3782 | + sizeof(struct squashfs_reg_inode_header_1));\ | |
3783 | + SQUASHFS_SWAP((s)->mtime, d, 24, 32);\ | |
3784 | + SQUASHFS_SWAP((s)->start_block, d, 56, 32);\ | |
3785 | + SQUASHFS_SWAP((s)->file_size, d, 88, 32);\ | |
3786 | +} | |
3787 | + | |
3788 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\ | |
3789 | + SQUASHFS_SWAP_START\ | |
3790 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | |
3791 | + sizeof(struct squashfs_dir_inode_header_1));\ | |
3792 | + SQUASHFS_SWAP((s)->file_size, d, 24, 19);\ | |
3793 | + SQUASHFS_SWAP((s)->offset, d, 43, 13);\ | |
3794 | + SQUASHFS_SWAP((s)->mtime, d, 56, 32);\ | |
3795 | + SQUASHFS_SWAP((s)->start_block, d, 88, 24);\ | |
3796 | +} | |
3797 | + | |
3798 | +#endif | |
3799 | + | |
3800 | +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY | |
3801 | + | |
3802 | +struct squashfs_dir_index_2 { | |
3803 | + unsigned int index:27; | |
3804 | + unsigned int start_block:29; | |
3805 | + unsigned char size; | |
3806 | + unsigned char name[0]; | |
3807 | +} __attribute__ ((packed)); | |
3808 | + | |
3809 | +struct squashfs_base_inode_header_2 { | |
3810 | + unsigned int inode_type:4; | |
3811 | + unsigned int mode:12; /* protection */ | |
3812 | + unsigned int uid:8; /* index into uid table */ | |
3813 | + unsigned int guid:8; /* index into guid table */ | |
3814 | +} __attribute__ ((packed)); | |
3815 | + | |
3816 | +struct squashfs_ipc_inode_header_2 { | |
3817 | + unsigned int inode_type:4; | |
3818 | + unsigned int mode:12; /* protection */ | |
3819 | + unsigned int uid:8; /* index into uid table */ | |
3820 | + unsigned int guid:8; /* index into guid table */ | |
3821 | +} __attribute__ ((packed)); | |
3822 | + | |
3823 | +struct squashfs_dev_inode_header_2 { | |
3824 | + unsigned int inode_type:4; | |
3825 | + unsigned int mode:12; /* protection */ | |
3826 | + unsigned int uid:8; /* index into uid table */ | |
3827 | + unsigned int guid:8; /* index into guid table */ | |
3828 | + unsigned short rdev; | |
3829 | +} __attribute__ ((packed)); | |
3830 | + | |
3831 | +struct squashfs_symlink_inode_header_2 { | |
3832 | + unsigned int inode_type:4; | |
3833 | + unsigned int mode:12; /* protection */ | |
3834 | + unsigned int uid:8; /* index into uid table */ | |
3835 | + unsigned int guid:8; /* index into guid table */ | |
3836 | + unsigned short symlink_size; | |
3837 | + char symlink[0]; | |
3838 | +} __attribute__ ((packed)); | |
3839 | + | |
3840 | +struct squashfs_reg_inode_header_2 { | |
3841 | + unsigned int inode_type:4; | |
3842 | + unsigned int mode:12; /* protection */ | |
3843 | + unsigned int uid:8; /* index into uid table */ | |
3844 | + unsigned int guid:8; /* index into guid table */ | |
3845 | + unsigned int mtime; | |
3846 | + unsigned int start_block; | |
3847 | + unsigned int fragment; | |
3848 | + unsigned int offset; | |
3849 | + unsigned int file_size:32; | |
3850 | + unsigned short block_list[0]; | |
3851 | +} __attribute__ ((packed)); | |
3852 | + | |
3853 | +struct squashfs_dir_inode_header_2 { | |
3854 | + unsigned int inode_type:4; | |
3855 | + unsigned int mode:12; /* protection */ | |
3856 | + unsigned int uid:8; /* index into uid table */ | |
3857 | + unsigned int guid:8; /* index into guid table */ | |
3858 | + unsigned int file_size:19; | |
3859 | + unsigned int offset:13; | |
3860 | + unsigned int mtime; | |
3861 | + unsigned int start_block:24; | |
3862 | +} __attribute__ ((packed)); | |
3863 | + | |
3864 | +struct squashfs_ldir_inode_header_2 { | |
3865 | + unsigned int inode_type:4; | |
3866 | + unsigned int mode:12; /* protection */ | |
3867 | + unsigned int uid:8; /* index into uid table */ | |
3868 | + unsigned int guid:8; /* index into guid table */ | |
3869 | + unsigned int file_size:27; | |
3870 | + unsigned int offset:13; | |
3871 | + unsigned int mtime; | |
3872 | + unsigned int start_block:24; | |
3873 | + unsigned int i_count:16; | |
3874 | + struct squashfs_dir_index_2 index[0]; | |
3875 | +} __attribute__ ((packed)); | |
3876 | + | |
3877 | +union squashfs_inode_header_2 { | |
3878 | + struct squashfs_base_inode_header_2 base; | |
3879 | + struct squashfs_dev_inode_header_2 dev; | |
3880 | + struct squashfs_symlink_inode_header_2 symlink; | |
3881 | + struct squashfs_reg_inode_header_2 reg; | |
3882 | + struct squashfs_dir_inode_header_2 dir; | |
3883 | + struct squashfs_ldir_inode_header_2 ldir; | |
3884 | + struct squashfs_ipc_inode_header_2 ipc; | |
3885 | +}; | |
3886 | + | |
3887 | +struct squashfs_dir_header_2 { | |
3888 | + unsigned int count:8; | |
3889 | + unsigned int start_block:24; | |
3890 | +} __attribute__ ((packed)); | |
3891 | + | |
3892 | +struct squashfs_dir_entry_2 { | |
3893 | + unsigned int offset:13; | |
3894 | + unsigned int type:3; | |
3895 | + unsigned int size:8; | |
3896 | + char name[0]; | |
3897 | +} __attribute__ ((packed)); | |
3898 | + | |
3899 | +struct squashfs_fragment_entry_2 { | |
3900 | + unsigned int start_block; | |
3901 | + unsigned int size; | |
3902 | +} __attribute__ ((packed)); | |
3903 | + | |
3904 | +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\ | |
3905 | + SQUASHFS_MEMSET(s, d, n);\ | |
3906 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ | |
3907 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ | |
3908 | + SQUASHFS_SWAP((s)->uid, d, 16, 8);\ | |
3909 | + SQUASHFS_SWAP((s)->guid, d, 24, 8);\ | |
3910 | + | |
3911 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\ | |
3912 | + SQUASHFS_SWAP_START\ | |
3913 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\ | |
3914 | +} | |
3915 | + | |
3916 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \ | |
3917 | + SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2)) | |
3918 | + | |
3919 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\ | |
3920 | + SQUASHFS_SWAP_START\ | |
3921 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | |
3922 | + sizeof(struct squashfs_dev_inode_header_2)); \ | |
3923 | + SQUASHFS_SWAP((s)->rdev, d, 32, 16);\ | |
3924 | +} | |
3925 | + | |
3926 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\ | |
3927 | + SQUASHFS_SWAP_START\ | |
3928 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | |
3929 | + sizeof(struct squashfs_symlink_inode_header_2));\ | |
3930 | + SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\ | |
3931 | +} | |
3932 | + | |
3933 | +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\ | |
3934 | + SQUASHFS_SWAP_START\ | |
3935 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | |
3936 | + sizeof(struct squashfs_reg_inode_header_2));\ | |
3937 | + SQUASHFS_SWAP((s)->mtime, d, 32, 32);\ | |
3938 | + SQUASHFS_SWAP((s)->start_block, d, 64, 32);\ | |
3939 | + SQUASHFS_SWAP((s)->fragment, d, 96, 32);\ | |
3940 | + SQUASHFS_SWAP((s)->offset, d, 128, 32);\ | |
3941 | + SQUASHFS_SWAP((s)->file_size, d, 160, 32);\ | |
3942 | +} | |
3943 | + | |
3944 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\ | |
3945 | + SQUASHFS_SWAP_START\ | |
3946 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | |
3947 | + sizeof(struct squashfs_dir_inode_header_2));\ | |
3948 | + SQUASHFS_SWAP((s)->file_size, d, 32, 19);\ | |
3949 | + SQUASHFS_SWAP((s)->offset, d, 51, 13);\ | |
3950 | + SQUASHFS_SWAP((s)->mtime, d, 64, 32);\ | |
3951 | + SQUASHFS_SWAP((s)->start_block, d, 96, 24);\ | |
3952 | +} | |
3953 | + | |
3954 | +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\ | |
3955 | + SQUASHFS_SWAP_START\ | |
3956 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | |
3957 | + sizeof(struct squashfs_ldir_inode_header_2));\ | |
3958 | + SQUASHFS_SWAP((s)->file_size, d, 32, 27);\ | |
3959 | + SQUASHFS_SWAP((s)->offset, d, 59, 13);\ | |
3960 | + SQUASHFS_SWAP((s)->mtime, d, 72, 32);\ | |
3961 | + SQUASHFS_SWAP((s)->start_block, d, 104, 24);\ | |
3962 | + SQUASHFS_SWAP((s)->i_count, d, 128, 16);\ | |
3963 | +} | |
3964 | + | |
3965 | +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\ | |
3966 | + SQUASHFS_SWAP_START\ | |
3967 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\ | |
3968 | + SQUASHFS_SWAP((s)->index, d, 0, 27);\ | |
3969 | + SQUASHFS_SWAP((s)->start_block, d, 27, 29);\ | |
3970 | + SQUASHFS_SWAP((s)->size, d, 56, 8);\ | |
3971 | +} | |
3972 | +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\ | |
3973 | + SQUASHFS_SWAP_START\ | |
3974 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\ | |
3975 | + SQUASHFS_SWAP((s)->count, d, 0, 8);\ | |
3976 | + SQUASHFS_SWAP((s)->start_block, d, 8, 24);\ | |
3977 | +} | |
3978 | + | |
3979 | +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\ | |
3980 | + SQUASHFS_SWAP_START\ | |
3981 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\ | |
3982 | + SQUASHFS_SWAP((s)->offset, d, 0, 13);\ | |
3983 | + SQUASHFS_SWAP((s)->type, d, 13, 3);\ | |
3984 | + SQUASHFS_SWAP((s)->size, d, 16, 8);\ | |
3985 | +} | |
3986 | + | |
3987 | +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\ | |
3988 | + SQUASHFS_SWAP_START\ | |
3989 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\ | |
3990 | + SQUASHFS_SWAP((s)->start_block, d, 0, 32);\ | |
3991 | + SQUASHFS_SWAP((s)->size, d, 32, 32);\ | |
3992 | +} | |
3993 | + | |
3994 | +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n) | |
3995 | + | |
3996 | +/* fragment and fragment table defines */ | |
3997 | +#define SQUASHFS_FRAGMENT_BYTES_2(A) (A * sizeof(struct squashfs_fragment_entry_2)) | |
3998 | + | |
3999 | +#define SQUASHFS_FRAGMENT_INDEX_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) / \ | |
4000 | + SQUASHFS_METADATA_SIZE) | |
4001 | + | |
4002 | +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) % \ | |
4003 | + SQUASHFS_METADATA_SIZE) | |
4004 | + | |
4005 | +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \ | |
4006 | + SQUASHFS_METADATA_SIZE - 1) / \ | |
4007 | + SQUASHFS_METADATA_SIZE) | |
4008 | + | |
4009 | +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A) (SQUASHFS_FRAGMENT_INDEXES_2(A) *\ | |
4010 | + sizeof(int)) | |
4011 | + | |
4012 | +#endif | |
4013 | + | |
4014 | +#ifdef __KERNEL__ | |
4015 | + | |
4016 | +/* | |
4017 | + * macros used to swap each structure entry, taking into account | |
4018 | + * bitfields and different bitfield placing conventions on differing | |
4019 | + * architectures | |
4020 | + */ | |
4021 | + | |
4022 | +#include <asm/byteorder.h> | |
4023 | + | |
4024 | +#ifdef __BIG_ENDIAN | |
4025 | + /* convert from little endian to big endian */ | |
4026 | +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \ | |
4027 | + tbits, b_pos) | |
4028 | +#else | |
4029 | + /* convert from big endian to little endian */ | |
4030 | +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \ | |
4031 | + tbits, 64 - tbits - b_pos) | |
4032 | +#endif | |
4033 | + | |
4034 | +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\ | |
4035 | + b_pos = pos % 8;\ | |
4036 | + val = 0;\ | |
4037 | + s = (unsigned char *)p + (pos / 8);\ | |
4038 | + d = ((unsigned char *) &val) + 7;\ | |
4039 | + for(bits = 0; bits < (tbits + b_pos); bits += 8) \ | |
4040 | + *d-- = *s++;\ | |
4041 | + value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\ | |
4042 | +} | |
4043 | + | |
4044 | +#define SQUASHFS_MEMSET(s, d, n) memset(s, 0, n); | |
4045 | + | |
4046 | +#endif | |
4047 | +#endif | |
4048 | --- /dev/null | |
4049 | +++ b/include/linux/squashfs_fs_i.h | |
4050 | @@ -0,0 +1,45 @@ | |
4051 | +#ifndef SQUASHFS_FS_I | |
4052 | +#define SQUASHFS_FS_I | |
4053 | +/* | |
4054 | + * Squashfs | |
4055 | + * | |
4056 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
4057 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | |
4058 | + * | |
4059 | + * This program is free software; you can redistribute it and/or | |
4060 | + * modify it under the terms of the GNU General Public License | |
4061 | + * as published by the Free Software Foundation; either version 2, | |
4062 | + * or (at your option) any later version. | |
4063 | + * | |
4064 | + * This program is distributed in the hope that it will be useful, | |
4065 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4066 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4067 | + * GNU General Public License for more details. | |
4068 | + * | |
4069 | + * You should have received a copy of the GNU General Public License | |
4070 | + * along with this program; if not, write to the Free Software | |
4071 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
4072 | + * | |
4073 | + * squashfs_fs_i.h | |
4074 | + */ | |
4075 | + | |
4076 | +struct squashfs_inode_info { | |
4077 | + long long start_block; | |
4078 | + unsigned int offset; | |
4079 | + union { | |
4080 | + struct { | |
4081 | + long long fragment_start_block; | |
4082 | + unsigned int fragment_size; | |
4083 | + unsigned int fragment_offset; | |
4084 | + long long block_list_start; | |
4085 | + } s1; | |
4086 | + struct { | |
4087 | + long long directory_index_start; | |
4088 | + unsigned int directory_index_offset; | |
4089 | + unsigned int directory_index_count; | |
4090 | + unsigned int parent_inode; | |
4091 | + } s2; | |
4092 | + } u; | |
4093 | + struct inode vfs_inode; | |
4094 | +}; | |
4095 | +#endif | |
4096 | --- /dev/null | |
4097 | +++ b/include/linux/squashfs_fs_sb.h | |
4098 | @@ -0,0 +1,79 @@ | |
4099 | +#ifndef SQUASHFS_FS_SB | |
4100 | +#define SQUASHFS_FS_SB | |
4101 | +/* | |
4102 | + * Squashfs | |
4103 | + * | |
4104 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 | |
4105 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | |
4106 | + * | |
4107 | + * This program is free software; you can redistribute it and/or | |
4108 | + * modify it under the terms of the GNU General Public License | |
4109 | + * as published by the Free Software Foundation; either version 2, | |
4110 | + * or (at your option) any later version. | |
4111 | + * | |
4112 | + * This program is distributed in the hope that it will be useful, | |
4113 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4114 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4115 | + * GNU General Public License for more details. | |
4116 | + * | |
4117 | + * You should have received a copy of the GNU General Public License | |
4118 | + * along with this program; if not, write to the Free Software | |
4119 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
4120 | + * | |
4121 | + * squashfs_fs_sb.h | |
4122 | + */ | |
4123 | + | |
4124 | +#include <linux/squashfs_fs.h> | |
4125 | + | |
4126 | +struct squashfs_cache_entry { | |
4127 | + long long block; | |
4128 | + int length; | |
4129 | + int locked; | |
4130 | + long long next_index; | |
4131 | + char pending; | |
4132 | + char error; | |
4133 | + int waiting; | |
4134 | + wait_queue_head_t wait_queue; | |
4135 | + char *data; | |
4136 | +}; | |
4137 | + | |
4138 | +struct squashfs_cache { | |
4139 | + char *name; | |
4140 | + int entries; | |
4141 | + int block_size; | |
4142 | + int next_blk; | |
4143 | + int waiting; | |
4144 | + int unused_blks; | |
4145 | + int use_vmalloc; | |
4146 | + spinlock_t lock; | |
4147 | + wait_queue_head_t wait_queue; | |
4148 | + struct squashfs_cache_entry entry[0]; | |
4149 | +}; | |
4150 | + | |
4151 | +struct squashfs_sb_info { | |
4152 | + struct squashfs_super_block sblk; | |
4153 | + int devblksize; | |
4154 | + int devblksize_log2; | |
4155 | + int swap; | |
4156 | + struct squashfs_cache *block_cache; | |
4157 | + struct squashfs_cache *fragment_cache; | |
4158 | + int next_meta_index; | |
4159 | + unsigned int *uid; | |
4160 | + unsigned int *guid; | |
4161 | + long long *fragment_index; | |
4162 | + unsigned int *fragment_index_2; | |
4163 | + char *read_page; | |
4164 | + struct mutex read_data_mutex; | |
4165 | + struct mutex read_page_mutex; | |
4166 | + struct mutex meta_index_mutex; | |
4167 | + struct meta_index *meta_index; | |
4168 | + z_stream stream; | |
4169 | + long long *inode_lookup_table; | |
4170 | + int (*read_inode)(struct inode *i, squashfs_inode_t \ | |
4171 | + inode); | |
4172 | + long long (*read_blocklist)(struct inode *inode, int \ | |
4173 | + index, int readahead_blks, char *block_list, \ | |
4174 | + unsigned short **block_p, unsigned int *bsize); | |
4175 | + int (*read_fragment_index_table)(struct super_block *s); | |
4176 | +}; | |
4177 | +#endif | |
4178 | --- a/init/do_mounts_rd.c | |
4179 | +++ b/init/do_mounts_rd.c | |
4180 | @@ -5,6 +5,7 @@ | |
4181 | #include <linux/ext2_fs.h> | |
4182 | #include <linux/romfs_fs.h> | |
4183 | #include <linux/cramfs_fs.h> | |
4184 | +#include <linux/squashfs_fs.h> | |
4185 | #include <linux/initrd.h> | |
4186 | #include <linux/string.h> | |
4187 | ||
4188 | @@ -37,6 +38,7 @@ static int __init crd_load(int in_fd, in | |
4189 | * numbers could not be found. | |
4190 | * | |
4191 | * We currently check for the following magic numbers: | |
4192 | + * squashfs | |
4193 | * minix | |
4194 | * ext2 | |
4195 | * romfs | |
4196 | @@ -51,6 +53,7 @@ identify_ramdisk_image(int fd, int start | |
4197 | struct ext2_super_block *ext2sb; | |
4198 | struct romfs_super_block *romfsb; | |
4199 | struct cramfs_super *cramfsb; | |
4200 | + struct squashfs_super_block *squashfsb; | |
4201 | int nblocks = -1; | |
4202 | unsigned char *buf; | |
4203 | ||
4204 | @@ -62,6 +65,7 @@ identify_ramdisk_image(int fd, int start | |
4205 | ext2sb = (struct ext2_super_block *) buf; | |
4206 | romfsb = (struct romfs_super_block *) buf; | |
4207 | cramfsb = (struct cramfs_super *) buf; | |
4208 | + squashfsb = (struct squashfs_super_block *) buf; | |
4209 | memset(buf, 0xe5, size); | |
4210 | ||
4211 | /* | |
4212 | @@ -99,6 +103,18 @@ identify_ramdisk_image(int fd, int start | |
4213 | goto done; | |
4214 | } | |
4215 | ||
4216 | + /* squashfs is at block zero too */ | |
4217 | + if (squashfsb->s_magic == SQUASHFS_MAGIC) { | |
4218 | + printk(KERN_NOTICE | |
4219 | + "RAMDISK: squashfs filesystem found at block %d\n", | |
4220 | + start_block); | |
4221 | + if (squashfsb->s_major < 3) | |
4222 | + nblocks = (squashfsb->bytes_used_2+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | |
4223 | + else | |
4224 | + nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | |
4225 | + goto done; | |
4226 | + } | |
4227 | + | |
4228 | /* | |
4229 | * Read block 1 to test for minix and ext2 superblock | |
4230 | */ |