Annotation of /trunk/kernel26-magellan/patches-2.6.25-r3/0152-2.6.25-squashfs-3.3-2.patch
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Revision 654 -
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Sun Jun 22 15:11:57 2008 UTC (16 years, 3 months ago) by niro
File size: 127993 byte(s)
Sun Jun 22 15:11:57 2008 UTC (16 years, 3 months ago) by niro
File size: 127993 byte(s)
-2.6.25-magellan-r3: -updated to linux-2.6.25.8 -added atl2 (2.0.4) support -enabled atl2 in kconfig
1 | niro | 654 | |
2 | iget changes for 2.6.25 by Daniel Drake <dsd@gentoo.org> | ||
3 | https://bugs.gentoo.org/show_bug.cgi?id=218169 | ||
4 | |||
5 | Index: linux-2.6.25-gentoo/fs/Kconfig | ||
6 | =================================================================== | ||
7 | --- linux-2.6.25-gentoo.orig/fs/Kconfig | ||
8 | +++ linux-2.6.25-gentoo/fs/Kconfig | ||
9 | @@ -1367,6 +1367,56 @@ config CRAMFS | ||
10 | |||
11 | If unsure, say N. | ||
12 | |||
13 | +config SQUASHFS | ||
14 | + tristate "SquashFS 3.3 - Squashed file system support" | ||
15 | + select ZLIB_INFLATE | ||
16 | + help | ||
17 | + Saying Y here includes support for SquashFS 3.3 (a Compressed | ||
18 | + Read-Only File System). Squashfs is a highly compressed read-only | ||
19 | + filesystem for Linux. It uses zlib compression to compress both | ||
20 | + files, inodes and directories. Inodes in the system are very small | ||
21 | + and all blocks are packed to minimise data overhead. Block sizes | ||
22 | + greater than 4K are supported up to a maximum of 1 Mbytes (default | ||
23 | + block size 128K). SquashFS 3.3 supports 64 bit filesystems and files | ||
24 | + (larger than 4GB), full uid/gid information, hard links and timestamps. | ||
25 | + | ||
26 | + Squashfs is intended for general read-only filesystem use, for | ||
27 | + archival use (i.e. in cases where a .tar.gz file may be used), and in | ||
28 | + embedded systems where low overhead is needed. Further information | ||
29 | + and filesystem tools are available from http://squashfs.sourceforge.net. | ||
30 | + | ||
31 | + If you want to compile this as a module ( = code which can be | ||
32 | + inserted in and removed from the running kernel whenever you want), | ||
33 | + say M here and read <file:Documentation/modules.txt>. The module | ||
34 | + will be called squashfs. Note that the root file system (the one | ||
35 | + containing the directory /) cannot be compiled as a module. | ||
36 | + | ||
37 | + If unsure, say N. | ||
38 | + | ||
39 | +config SQUASHFS_EMBEDDED | ||
40 | + | ||
41 | + bool "Additional option for memory-constrained systems" | ||
42 | + depends on SQUASHFS | ||
43 | + default n | ||
44 | + help | ||
45 | + Saying Y here allows you to specify cache size. | ||
46 | + | ||
47 | + If unsure, say N. | ||
48 | + | ||
49 | +config SQUASHFS_FRAGMENT_CACHE_SIZE | ||
50 | + int "Number of fragments cached" if SQUASHFS_EMBEDDED | ||
51 | + depends on SQUASHFS | ||
52 | + default "3" | ||
53 | + help | ||
54 | + By default SquashFS caches the last 3 fragments read from | ||
55 | + the filesystem. Increasing this amount may mean SquashFS | ||
56 | + has to re-read fragments less often from disk, at the expense | ||
57 | + of extra system memory. Decreasing this amount will mean | ||
58 | + SquashFS uses less memory at the expense of extra reads from disk. | ||
59 | + | ||
60 | + Note there must be at least one cached fragment. Anything | ||
61 | + much more than three will probably not make much difference. | ||
62 | + | ||
63 | config VXFS_FS | ||
64 | tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)" | ||
65 | depends on BLOCK | ||
66 | Index: linux-2.6.25-gentoo/fs/Makefile | ||
67 | =================================================================== | ||
68 | --- linux-2.6.25-gentoo.orig/fs/Makefile | ||
69 | +++ linux-2.6.25-gentoo/fs/Makefile | ||
70 | @@ -73,6 +73,7 @@ obj-$(CONFIG_JBD) += jbd/ | ||
71 | obj-$(CONFIG_JBD2) += jbd2/ | ||
72 | obj-$(CONFIG_EXT2_FS) += ext2/ | ||
73 | obj-$(CONFIG_CRAMFS) += cramfs/ | ||
74 | +obj-$(CONFIG_SQUASHFS) += squashfs/ | ||
75 | obj-y += ramfs/ | ||
76 | obj-$(CONFIG_HUGETLBFS) += hugetlbfs/ | ||
77 | obj-$(CONFIG_CODA_FS) += coda/ | ||
78 | Index: linux-2.6.25-gentoo/fs/squashfs/inode.c | ||
79 | =================================================================== | ||
80 | --- /dev/null | ||
81 | +++ linux-2.6.25-gentoo/fs/squashfs/inode.c | ||
82 | @@ -0,0 +1,2186 @@ | ||
83 | +/* | ||
84 | + * Squashfs - a compressed read only filesystem for Linux | ||
85 | + * | ||
86 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007 | ||
87 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
88 | + * | ||
89 | + * This program is free software; you can redistribute it and/or | ||
90 | + * modify it under the terms of the GNU General Public License | ||
91 | + * as published by the Free Software Foundation; either version 2, | ||
92 | + * or (at your option) any later version. | ||
93 | + * | ||
94 | + * This program is distributed in the hope that it will be useful, | ||
95 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
96 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
97 | + * GNU General Public License for more details. | ||
98 | + * | ||
99 | + * You should have received a copy of the GNU General Public License | ||
100 | + * along with this program; if not, write to the Free Software | ||
101 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
102 | + * | ||
103 | + * inode.c | ||
104 | + */ | ||
105 | + | ||
106 | +#include <linux/squashfs_fs.h> | ||
107 | +#include <linux/module.h> | ||
108 | +#include <linux/zlib.h> | ||
109 | +#include <linux/fs.h> | ||
110 | +#include <linux/squashfs_fs_sb.h> | ||
111 | +#include <linux/squashfs_fs_i.h> | ||
112 | +#include <linux/buffer_head.h> | ||
113 | +#include <linux/vfs.h> | ||
114 | +#include <linux/vmalloc.h> | ||
115 | +#include <linux/smp_lock.h> | ||
116 | +#include <linux/exportfs.h> | ||
117 | +#include <linux/sched.h> | ||
118 | + | ||
119 | +#include "squashfs.h" | ||
120 | + | ||
121 | +int squashfs_cached_blks; | ||
122 | + | ||
123 | +static struct dentry *squashfs_get_parent(struct dentry *child); | ||
124 | +static int squashfs_read_inode(struct inode *i, squashfs_inode_t inode); | ||
125 | +static int squashfs_statfs(struct dentry *, struct kstatfs *); | ||
126 | +static int squashfs_symlink_readpage(struct file *file, struct page *page); | ||
127 | +static long long read_blocklist(struct inode *inode, int index, | ||
128 | + int readahead_blks, char *block_list, | ||
129 | + unsigned short **block_p, unsigned int *bsize); | ||
130 | +static int squashfs_readpage(struct file *file, struct page *page); | ||
131 | +static int squashfs_readdir(struct file *, void *, filldir_t); | ||
132 | +static struct dentry *squashfs_lookup(struct inode *, struct dentry *, | ||
133 | + struct nameidata *); | ||
134 | +static int squashfs_remount(struct super_block *s, int *flags, char *data); | ||
135 | +static void squashfs_put_super(struct super_block *); | ||
136 | +static int squashfs_get_sb(struct file_system_type *,int, const char *, void *, | ||
137 | + struct vfsmount *); | ||
138 | +static struct inode *squashfs_alloc_inode(struct super_block *sb); | ||
139 | +static void squashfs_destroy_inode(struct inode *inode); | ||
140 | +static int init_inodecache(void); | ||
141 | +static void destroy_inodecache(void); | ||
142 | + | ||
143 | +static struct file_system_type squashfs_fs_type = { | ||
144 | + .owner = THIS_MODULE, | ||
145 | + .name = "squashfs", | ||
146 | + .get_sb = squashfs_get_sb, | ||
147 | + .kill_sb = kill_block_super, | ||
148 | + .fs_flags = FS_REQUIRES_DEV | ||
149 | +}; | ||
150 | + | ||
151 | +static const unsigned char squashfs_filetype_table[] = { | ||
152 | + DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK | ||
153 | +}; | ||
154 | + | ||
155 | +static struct super_operations squashfs_super_ops = { | ||
156 | + .alloc_inode = squashfs_alloc_inode, | ||
157 | + .destroy_inode = squashfs_destroy_inode, | ||
158 | + .statfs = squashfs_statfs, | ||
159 | + .put_super = squashfs_put_super, | ||
160 | + .remount_fs = squashfs_remount | ||
161 | +}; | ||
162 | + | ||
163 | +static struct super_operations squashfs_export_super_ops = { | ||
164 | + .alloc_inode = squashfs_alloc_inode, | ||
165 | + .destroy_inode = squashfs_destroy_inode, | ||
166 | + .statfs = squashfs_statfs, | ||
167 | + .put_super = squashfs_put_super, | ||
168 | +}; | ||
169 | + | ||
170 | +static struct export_operations squashfs_export_ops = { | ||
171 | + .get_parent = squashfs_get_parent | ||
172 | +}; | ||
173 | + | ||
174 | +SQSH_EXTERN const struct address_space_operations squashfs_symlink_aops = { | ||
175 | + .readpage = squashfs_symlink_readpage | ||
176 | +}; | ||
177 | + | ||
178 | +SQSH_EXTERN const struct address_space_operations squashfs_aops = { | ||
179 | + .readpage = squashfs_readpage | ||
180 | +}; | ||
181 | + | ||
182 | +static const struct file_operations squashfs_dir_ops = { | ||
183 | + .read = generic_read_dir, | ||
184 | + .readdir = squashfs_readdir | ||
185 | +}; | ||
186 | + | ||
187 | +SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = { | ||
188 | + .lookup = squashfs_lookup | ||
189 | +}; | ||
190 | + | ||
191 | + | ||
192 | +static struct buffer_head *get_block_length(struct super_block *s, | ||
193 | + int *cur_index, int *offset, int *c_byte) | ||
194 | +{ | ||
195 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
196 | + unsigned short temp; | ||
197 | + struct buffer_head *bh; | ||
198 | + | ||
199 | + if (!(bh = sb_bread(s, *cur_index))) | ||
200 | + goto out; | ||
201 | + | ||
202 | + if (msblk->devblksize - *offset == 1) { | ||
203 | + if (msblk->swap) | ||
204 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | ||
205 | + (bh->b_data + *offset)); | ||
206 | + else | ||
207 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | ||
208 | + (bh->b_data + *offset)); | ||
209 | + brelse(bh); | ||
210 | + if (!(bh = sb_bread(s, ++(*cur_index)))) | ||
211 | + goto out; | ||
212 | + if (msblk->swap) | ||
213 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | ||
214 | + bh->b_data); | ||
215 | + else | ||
216 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | ||
217 | + bh->b_data); | ||
218 | + *c_byte = temp; | ||
219 | + *offset = 1; | ||
220 | + } else { | ||
221 | + if (msblk->swap) { | ||
222 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | ||
223 | + (bh->b_data + *offset)); | ||
224 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | ||
225 | + (bh->b_data + *offset + 1)); | ||
226 | + } else { | ||
227 | + ((unsigned char *) &temp)[0] = *((unsigned char *) | ||
228 | + (bh->b_data + *offset)); | ||
229 | + ((unsigned char *) &temp)[1] = *((unsigned char *) | ||
230 | + (bh->b_data + *offset + 1)); | ||
231 | + } | ||
232 | + *c_byte = temp; | ||
233 | + *offset += 2; | ||
234 | + } | ||
235 | + | ||
236 | + if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) { | ||
237 | + if (*offset == msblk->devblksize) { | ||
238 | + brelse(bh); | ||
239 | + if (!(bh = sb_bread(s, ++(*cur_index)))) | ||
240 | + goto out; | ||
241 | + *offset = 0; | ||
242 | + } | ||
243 | + if (*((unsigned char *) (bh->b_data + *offset)) != | ||
244 | + SQUASHFS_MARKER_BYTE) { | ||
245 | + ERROR("Metadata block marker corrupt @ %x\n", | ||
246 | + *cur_index); | ||
247 | + brelse(bh); | ||
248 | + goto out; | ||
249 | + } | ||
250 | + (*offset)++; | ||
251 | + } | ||
252 | + return bh; | ||
253 | + | ||
254 | +out: | ||
255 | + return NULL; | ||
256 | +} | ||
257 | + | ||
258 | + | ||
259 | +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer, | ||
260 | + long long index, unsigned int length, | ||
261 | + long long *next_index, int srclength) | ||
262 | +{ | ||
263 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
264 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
265 | + struct buffer_head **bh; | ||
266 | + unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1); | ||
267 | + unsigned int cur_index = index >> msblk->devblksize_log2; | ||
268 | + int bytes, avail_bytes, b = 0, k = 0; | ||
269 | + unsigned int compressed; | ||
270 | + unsigned int c_byte = length; | ||
271 | + | ||
272 | + bh = kmalloc(((sblk->block_size >> msblk->devblksize_log2) + 1) * | ||
273 | + sizeof(struct buffer_head *), GFP_KERNEL); | ||
274 | + if (bh == NULL) | ||
275 | + goto read_failure; | ||
276 | + | ||
277 | + if (c_byte) { | ||
278 | + bytes = msblk->devblksize - offset; | ||
279 | + compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte); | ||
280 | + c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte); | ||
281 | + | ||
282 | + TRACE("Block @ 0x%llx, %scompressed size %d, src size %d\n", index, | ||
283 | + compressed ? "" : "un", (unsigned int) c_byte, srclength); | ||
284 | + | ||
285 | + if (c_byte > srclength || index < 0 || (index + c_byte) > sblk->bytes_used) | ||
286 | + goto read_failure; | ||
287 | + | ||
288 | + bh[0] = sb_getblk(s, cur_index); | ||
289 | + if (bh[0] == NULL) | ||
290 | + goto block_release; | ||
291 | + | ||
292 | + for (b = 1; bytes < c_byte; b++) { | ||
293 | + bh[b] = sb_getblk(s, ++cur_index); | ||
294 | + if (bh[b] == NULL) | ||
295 | + goto block_release; | ||
296 | + bytes += msblk->devblksize; | ||
297 | + } | ||
298 | + ll_rw_block(READ, b, bh); | ||
299 | + } else { | ||
300 | + if (index < 0 || (index + 2) > sblk->bytes_used) | ||
301 | + goto read_failure; | ||
302 | + | ||
303 | + bh[0] = get_block_length(s, &cur_index, &offset, &c_byte); | ||
304 | + if (bh[0] == NULL) | ||
305 | + goto read_failure; | ||
306 | + | ||
307 | + bytes = msblk->devblksize - offset; | ||
308 | + compressed = SQUASHFS_COMPRESSED(c_byte); | ||
309 | + c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte); | ||
310 | + | ||
311 | + TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed | ||
312 | + ? "" : "un", (unsigned int) c_byte); | ||
313 | + | ||
314 | + if (c_byte > srclength || (index + c_byte) > sblk->bytes_used) | ||
315 | + goto read_failure; | ||
316 | + | ||
317 | + for (b = 1; bytes < c_byte; b++) { | ||
318 | + bh[b] = sb_getblk(s, ++cur_index); | ||
319 | + if (bh[b] == NULL) | ||
320 | + goto block_release; | ||
321 | + bytes += msblk->devblksize; | ||
322 | + } | ||
323 | + ll_rw_block(READ, b - 1, bh + 1); | ||
324 | + } | ||
325 | + | ||
326 | + if (compressed) { | ||
327 | + int zlib_err = 0; | ||
328 | + | ||
329 | + /* | ||
330 | + * uncompress block | ||
331 | + */ | ||
332 | + | ||
333 | + mutex_lock(&msblk->read_data_mutex); | ||
334 | + | ||
335 | + msblk->stream.next_out = buffer; | ||
336 | + msblk->stream.avail_out = srclength; | ||
337 | + | ||
338 | + for (bytes = 0; k < b; k++) { | ||
339 | + avail_bytes = min(c_byte - bytes, msblk->devblksize - offset); | ||
340 | + | ||
341 | + wait_on_buffer(bh[k]); | ||
342 | + if (!buffer_uptodate(bh[k])) | ||
343 | + goto release_mutex; | ||
344 | + | ||
345 | + msblk->stream.next_in = bh[k]->b_data + offset; | ||
346 | + msblk->stream.avail_in = avail_bytes; | ||
347 | + | ||
348 | + if (k == 0) { | ||
349 | + zlib_err = zlib_inflateInit(&msblk->stream); | ||
350 | + if (zlib_err != Z_OK) { | ||
351 | + ERROR("zlib_inflateInit returned unexpected result 0x%x," | ||
352 | + " srclength %d\n", zlib_err, srclength); | ||
353 | + goto release_mutex; | ||
354 | + } | ||
355 | + | ||
356 | + if (avail_bytes == 0) { | ||
357 | + offset = 0; | ||
358 | + brelse(bh[k]); | ||
359 | + continue; | ||
360 | + } | ||
361 | + } | ||
362 | + | ||
363 | + zlib_err = zlib_inflate(&msblk->stream, Z_NO_FLUSH); | ||
364 | + if (zlib_err != Z_OK && zlib_err != Z_STREAM_END) { | ||
365 | + ERROR("zlib_inflate returned unexpected result 0x%x," | ||
366 | + " srclength %d, avail_in %d, avail_out %d\n", zlib_err, | ||
367 | + srclength, msblk->stream.avail_in, msblk->stream.avail_out); | ||
368 | + goto release_mutex; | ||
369 | + } | ||
370 | + | ||
371 | + bytes += avail_bytes; | ||
372 | + offset = 0; | ||
373 | + brelse(bh[k]); | ||
374 | + } | ||
375 | + | ||
376 | + if (zlib_err != Z_STREAM_END) | ||
377 | + goto release_mutex; | ||
378 | + | ||
379 | + zlib_err = zlib_inflateEnd(&msblk->stream); | ||
380 | + if (zlib_err != Z_OK) { | ||
381 | + ERROR("zlib_inflateEnd returned unexpected result 0x%x," | ||
382 | + " srclength %d\n", zlib_err, srclength); | ||
383 | + goto release_mutex; | ||
384 | + } | ||
385 | + bytes = msblk->stream.total_out; | ||
386 | + mutex_unlock(&msblk->read_data_mutex); | ||
387 | + } else { | ||
388 | + int i; | ||
389 | + | ||
390 | + for(i = 0; i < b; i++) { | ||
391 | + wait_on_buffer(bh[i]); | ||
392 | + if (!buffer_uptodate(bh[i])) | ||
393 | + goto block_release; | ||
394 | + } | ||
395 | + | ||
396 | + for (bytes = 0; k < b; k++) { | ||
397 | + avail_bytes = min(c_byte - bytes, msblk->devblksize - offset); | ||
398 | + | ||
399 | + memcpy(buffer + bytes, bh[k]->b_data + offset, avail_bytes); | ||
400 | + bytes += avail_bytes; | ||
401 | + offset = 0; | ||
402 | + brelse(bh[k]); | ||
403 | + } | ||
404 | + } | ||
405 | + | ||
406 | + if (next_index) | ||
407 | + *next_index = index + c_byte + (length ? 0 : | ||
408 | + (SQUASHFS_CHECK_DATA(msblk->sblk.flags) ? 3 : 2)); | ||
409 | + | ||
410 | + kfree(bh); | ||
411 | + return bytes; | ||
412 | + | ||
413 | +release_mutex: | ||
414 | + mutex_unlock(&msblk->read_data_mutex); | ||
415 | + | ||
416 | +block_release: | ||
417 | + for (; k < b; k++) | ||
418 | + brelse(bh[k]); | ||
419 | + | ||
420 | +read_failure: | ||
421 | + ERROR("sb_bread failed reading block 0x%x\n", cur_index); | ||
422 | + kfree(bh); | ||
423 | + return 0; | ||
424 | +} | ||
425 | + | ||
426 | + | ||
427 | +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, void *buffer, | ||
428 | + long long block, unsigned int offset, | ||
429 | + int length, long long *next_block, | ||
430 | + unsigned int *next_offset) | ||
431 | +{ | ||
432 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
433 | + int n, i, bytes, return_length = length; | ||
434 | + long long next_index; | ||
435 | + | ||
436 | + TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset); | ||
437 | + | ||
438 | + while (1) { | ||
439 | + for (i = 0; i < squashfs_cached_blks; i++) | ||
440 | + if (msblk->block_cache[i].block == block) | ||
441 | + break; | ||
442 | + | ||
443 | + mutex_lock(&msblk->block_cache_mutex); | ||
444 | + | ||
445 | + if (i == squashfs_cached_blks) { | ||
446 | + /* read inode header block */ | ||
447 | + if (msblk->unused_cache_blks == 0) { | ||
448 | + mutex_unlock(&msblk->block_cache_mutex); | ||
449 | + wait_event(msblk->waitq, msblk->unused_cache_blks); | ||
450 | + continue; | ||
451 | + } | ||
452 | + | ||
453 | + i = msblk->next_cache; | ||
454 | + for (n = 0; n < squashfs_cached_blks; n++) { | ||
455 | + if (msblk->block_cache[i].block != SQUASHFS_USED_BLK) | ||
456 | + break; | ||
457 | + i = (i + 1) % squashfs_cached_blks; | ||
458 | + } | ||
459 | + | ||
460 | + msblk->next_cache = (i + 1) % squashfs_cached_blks; | ||
461 | + | ||
462 | + if (msblk->block_cache[i].block == SQUASHFS_INVALID_BLK) { | ||
463 | + msblk->block_cache[i].data = vmalloc(SQUASHFS_METADATA_SIZE); | ||
464 | + if (msblk->block_cache[i].data == NULL) { | ||
465 | + ERROR("Failed to allocate cache block\n"); | ||
466 | + mutex_unlock(&msblk->block_cache_mutex); | ||
467 | + goto out; | ||
468 | + } | ||
469 | + } | ||
470 | + | ||
471 | + msblk->block_cache[i].block = SQUASHFS_USED_BLK; | ||
472 | + msblk->unused_cache_blks --; | ||
473 | + mutex_unlock(&msblk->block_cache_mutex); | ||
474 | + | ||
475 | + msblk->block_cache[i].length = squashfs_read_data(s, | ||
476 | + msblk->block_cache[i].data, block, 0, &next_index, | ||
477 | + SQUASHFS_METADATA_SIZE); | ||
478 | + | ||
479 | + if (msblk->block_cache[i].length == 0) { | ||
480 | + ERROR("Unable to read cache block [%llx:%x]\n", block, offset); | ||
481 | + mutex_lock(&msblk->block_cache_mutex); | ||
482 | + msblk->block_cache[i].block = SQUASHFS_INVALID_BLK; | ||
483 | + msblk->unused_cache_blks ++; | ||
484 | + smp_mb(); | ||
485 | + vfree(msblk->block_cache[i].data); | ||
486 | + wake_up(&msblk->waitq); | ||
487 | + mutex_unlock(&msblk->block_cache_mutex); | ||
488 | + goto out; | ||
489 | + } | ||
490 | + | ||
491 | + mutex_lock(&msblk->block_cache_mutex); | ||
492 | + msblk->block_cache[i].block = block; | ||
493 | + msblk->block_cache[i].next_index = next_index; | ||
494 | + msblk->unused_cache_blks ++; | ||
495 | + smp_mb(); | ||
496 | + wake_up(&msblk->waitq); | ||
497 | + TRACE("Read cache block [%llx:%x]\n", block, offset); | ||
498 | + } | ||
499 | + | ||
500 | + if (msblk->block_cache[i].block != block) { | ||
501 | + mutex_unlock(&msblk->block_cache_mutex); | ||
502 | + continue; | ||
503 | + } | ||
504 | + | ||
505 | + bytes = msblk->block_cache[i].length - offset; | ||
506 | + | ||
507 | + if (bytes < 1) { | ||
508 | + mutex_unlock(&msblk->block_cache_mutex); | ||
509 | + goto out; | ||
510 | + } else if (bytes >= length) { | ||
511 | + if (buffer) | ||
512 | + memcpy(buffer, msblk->block_cache[i].data + offset, length); | ||
513 | + if (msblk->block_cache[i].length - offset == length) { | ||
514 | + *next_block = msblk->block_cache[i].next_index; | ||
515 | + *next_offset = 0; | ||
516 | + } else { | ||
517 | + *next_block = block; | ||
518 | + *next_offset = offset + length; | ||
519 | + } | ||
520 | + mutex_unlock(&msblk->block_cache_mutex); | ||
521 | + goto finish; | ||
522 | + } else { | ||
523 | + if (buffer) { | ||
524 | + memcpy(buffer, msblk->block_cache[i].data + offset, bytes); | ||
525 | + buffer = (char *) buffer + bytes; | ||
526 | + } | ||
527 | + block = msblk->block_cache[i].next_index; | ||
528 | + mutex_unlock(&msblk->block_cache_mutex); | ||
529 | + length -= bytes; | ||
530 | + offset = 0; | ||
531 | + } | ||
532 | + } | ||
533 | + | ||
534 | +finish: | ||
535 | + return return_length; | ||
536 | +out: | ||
537 | + return 0; | ||
538 | +} | ||
539 | + | ||
540 | + | ||
541 | +static int get_fragment_location(struct super_block *s, unsigned int fragment, | ||
542 | + long long *fragment_start_block, | ||
543 | + unsigned int *fragment_size) | ||
544 | +{ | ||
545 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
546 | + long long start_block = | ||
547 | + msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)]; | ||
548 | + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment); | ||
549 | + struct squashfs_fragment_entry fragment_entry; | ||
550 | + | ||
551 | + if (msblk->swap) { | ||
552 | + struct squashfs_fragment_entry sfragment_entry; | ||
553 | + | ||
554 | + if (!squashfs_get_cached_block(s, &sfragment_entry, start_block, offset, | ||
555 | + sizeof(sfragment_entry), &start_block, &offset)) | ||
556 | + goto out; | ||
557 | + SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry); | ||
558 | + } else | ||
559 | + if (!squashfs_get_cached_block(s, &fragment_entry, start_block, offset, | ||
560 | + sizeof(fragment_entry), &start_block, &offset)) | ||
561 | + goto out; | ||
562 | + | ||
563 | + *fragment_start_block = fragment_entry.start_block; | ||
564 | + *fragment_size = fragment_entry.size; | ||
565 | + | ||
566 | + return 1; | ||
567 | + | ||
568 | +out: | ||
569 | + return 0; | ||
570 | +} | ||
571 | + | ||
572 | + | ||
573 | +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, | ||
574 | + struct squashfs_fragment_cache *fragment) | ||
575 | +{ | ||
576 | + mutex_lock(&msblk->fragment_mutex); | ||
577 | + fragment->locked --; | ||
578 | + if (fragment->locked == 0) { | ||
579 | + msblk->unused_frag_blks ++; | ||
580 | + smp_mb(); | ||
581 | + wake_up(&msblk->fragment_wait_queue); | ||
582 | + } | ||
583 | + mutex_unlock(&msblk->fragment_mutex); | ||
584 | +} | ||
585 | + | ||
586 | + | ||
587 | +SQSH_EXTERN | ||
588 | +struct squashfs_fragment_cache *get_cached_fragment(struct super_block *s, | ||
589 | + long long start_block, int length) | ||
590 | +{ | ||
591 | + int i, n; | ||
592 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
593 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
594 | + | ||
595 | + while (1) { | ||
596 | + mutex_lock(&msblk->fragment_mutex); | ||
597 | + | ||
598 | + for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS && | ||
599 | + msblk->fragment[i].block != start_block; i++); | ||
600 | + | ||
601 | + if (i == SQUASHFS_CACHED_FRAGMENTS) { | ||
602 | + if (msblk->unused_frag_blks == 0) { | ||
603 | + mutex_unlock(&msblk->fragment_mutex); | ||
604 | + wait_event(msblk->fragment_wait_queue, msblk->unused_frag_blks); | ||
605 | + continue; | ||
606 | + } | ||
607 | + | ||
608 | + i = msblk->next_fragment; | ||
609 | + for (n = 0; n < SQUASHFS_CACHED_FRAGMENTS; n++) { | ||
610 | + if (msblk->fragment[i].locked == 0) | ||
611 | + break; | ||
612 | + i = (i + 1) % SQUASHFS_CACHED_FRAGMENTS; | ||
613 | + } | ||
614 | + | ||
615 | + msblk->next_fragment = (msblk->next_fragment + 1) % | ||
616 | + SQUASHFS_CACHED_FRAGMENTS; | ||
617 | + | ||
618 | + if (msblk->fragment[i].data == NULL) { | ||
619 | + msblk->fragment[i].data = vmalloc(sblk->block_size); | ||
620 | + if (msblk->fragment[i].data == NULL) { | ||
621 | + ERROR("Failed to allocate fragment cache block\n"); | ||
622 | + mutex_unlock(&msblk->fragment_mutex); | ||
623 | + goto out; | ||
624 | + } | ||
625 | + } | ||
626 | + | ||
627 | + msblk->unused_frag_blks --; | ||
628 | + msblk->fragment[i].block = SQUASHFS_INVALID_BLK; | ||
629 | + msblk->fragment[i].locked = 1; | ||
630 | + mutex_unlock(&msblk->fragment_mutex); | ||
631 | + | ||
632 | + msblk->fragment[i].length = squashfs_read_data(s, | ||
633 | + msblk->fragment[i].data, start_block, length, NULL, | ||
634 | + sblk->block_size); | ||
635 | + | ||
636 | + if (msblk->fragment[i].length == 0) { | ||
637 | + ERROR("Unable to read fragment cache block [%llx]\n", start_block); | ||
638 | + msblk->fragment[i].locked = 0; | ||
639 | + msblk->unused_frag_blks ++; | ||
640 | + smp_mb(); | ||
641 | + wake_up(&msblk->fragment_wait_queue); | ||
642 | + goto out; | ||
643 | + } | ||
644 | + | ||
645 | + mutex_lock(&msblk->fragment_mutex); | ||
646 | + msblk->fragment[i].block = start_block; | ||
647 | + TRACE("New fragment %d, start block %lld, locked %d\n", | ||
648 | + i, msblk->fragment[i].block, msblk->fragment[i].locked); | ||
649 | + mutex_unlock(&msblk->fragment_mutex); | ||
650 | + break; | ||
651 | + } | ||
652 | + | ||
653 | + if (msblk->fragment[i].locked == 0) | ||
654 | + msblk->unused_frag_blks --; | ||
655 | + msblk->fragment[i].locked++; | ||
656 | + mutex_unlock(&msblk->fragment_mutex); | ||
657 | + TRACE("Got fragment %d, start block %lld, locked %d\n", i, | ||
658 | + msblk->fragment[i].block, msblk->fragment[i].locked); | ||
659 | + break; | ||
660 | + } | ||
661 | + | ||
662 | + return &msblk->fragment[i]; | ||
663 | + | ||
664 | +out: | ||
665 | + return NULL; | ||
666 | +} | ||
667 | + | ||
668 | + | ||
669 | +static void squashfs_new_inode(struct squashfs_sb_info *msblk, struct inode *i, | ||
670 | + struct squashfs_base_inode_header *inodeb) | ||
671 | +{ | ||
672 | + i->i_ino = inodeb->inode_number; | ||
673 | + i->i_mtime.tv_sec = inodeb->mtime; | ||
674 | + i->i_atime.tv_sec = inodeb->mtime; | ||
675 | + i->i_ctime.tv_sec = inodeb->mtime; | ||
676 | + i->i_uid = msblk->uid[inodeb->uid]; | ||
677 | + i->i_mode = inodeb->mode; | ||
678 | + i->i_size = 0; | ||
679 | + | ||
680 | + if (inodeb->guid == SQUASHFS_GUIDS) | ||
681 | + i->i_gid = i->i_uid; | ||
682 | + else | ||
683 | + i->i_gid = msblk->guid[inodeb->guid]; | ||
684 | +} | ||
685 | + | ||
686 | + | ||
687 | +static squashfs_inode_t squashfs_inode_lookup(struct super_block *s, int ino) | ||
688 | +{ | ||
689 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
690 | + long long start = msblk->inode_lookup_table[SQUASHFS_LOOKUP_BLOCK(ino - 1)]; | ||
691 | + int offset = SQUASHFS_LOOKUP_BLOCK_OFFSET(ino - 1); | ||
692 | + squashfs_inode_t inode; | ||
693 | + | ||
694 | + TRACE("Entered squashfs_inode_lookup, inode_number = %d\n", ino); | ||
695 | + | ||
696 | + if (msblk->swap) { | ||
697 | + squashfs_inode_t sinode; | ||
698 | + | ||
699 | + if (!squashfs_get_cached_block(s, &sinode, start, offset, | ||
700 | + sizeof(sinode), &start, &offset)) | ||
701 | + goto out; | ||
702 | + SQUASHFS_SWAP_INODE_T((&inode), &sinode); | ||
703 | + } else if (!squashfs_get_cached_block(s, &inode, start, offset, | ||
704 | + sizeof(inode), &start, &offset)) | ||
705 | + goto out; | ||
706 | + | ||
707 | + TRACE("squashfs_inode_lookup, inode = 0x%llx\n", inode); | ||
708 | + | ||
709 | + return inode; | ||
710 | + | ||
711 | +out: | ||
712 | + return SQUASHFS_INVALID_BLK; | ||
713 | +} | ||
714 | + | ||
715 | +static struct dentry *squashfs_get_parent(struct dentry *child) | ||
716 | +{ | ||
717 | + struct inode *i = child->d_inode; | ||
718 | + unsigned long ino = SQUASHFS_I(i)->u.s2.parent_inode; | ||
719 | + squashfs_inode_t inode = squashfs_inode_lookup(i->i_sb, ino); | ||
720 | + struct inode *parent; | ||
721 | + struct dentry *rv; | ||
722 | + | ||
723 | + TRACE("Entered squashfs_get_parent\n"); | ||
724 | + | ||
725 | + if (inode == SQUASHFS_INVALID_BLK) | ||
726 | + return ERR_PTR(-EINVAL); | ||
727 | + | ||
728 | + parent = squashfs_iget(i->i_sb, inode, ino); | ||
729 | + if (IS_ERR(parent)) { | ||
730 | + rv = ERR_PTR(-EACCES); | ||
731 | + goto out; | ||
732 | + } | ||
733 | + | ||
734 | + rv = d_alloc_anon(parent); | ||
735 | + if(rv == NULL) | ||
736 | + rv = ERR_PTR(-ENOMEM); | ||
737 | + | ||
738 | +out: | ||
739 | + return rv; | ||
740 | +} | ||
741 | + | ||
742 | + | ||
743 | +SQSH_EXTERN struct inode *squashfs_iget(struct super_block *s, | ||
744 | + squashfs_inode_t inode, unsigned int inode_number) | ||
745 | +{ | ||
746 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
747 | + struct inode *i = iget_locked(s, inode_number); | ||
748 | + | ||
749 | + TRACE("Entered squashfs_iget\n"); | ||
750 | + if (!i) | ||
751 | + return ERR_PTR(-ENOMEM); | ||
752 | + | ||
753 | + if (i->i_state & I_NEW) { | ||
754 | + (msblk->read_inode)(i, inode); | ||
755 | + unlock_new_inode(i); | ||
756 | + } | ||
757 | + | ||
758 | + return i; | ||
759 | +} | ||
760 | + | ||
761 | + | ||
762 | +static int squashfs_read_inode(struct inode *i, squashfs_inode_t inode) | ||
763 | +{ | ||
764 | + struct super_block *s = i->i_sb; | ||
765 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
766 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
767 | + long long block = SQUASHFS_INODE_BLK(inode) + sblk->inode_table_start; | ||
768 | + unsigned int offset = SQUASHFS_INODE_OFFSET(inode); | ||
769 | + long long next_block; | ||
770 | + unsigned int next_offset; | ||
771 | + union squashfs_inode_header id, sid; | ||
772 | + struct squashfs_base_inode_header *inodeb = &id.base, *sinodeb = &sid.base; | ||
773 | + | ||
774 | + TRACE("Entered squashfs_read_inode\n"); | ||
775 | + | ||
776 | + if (msblk->swap) { | ||
777 | + if (!squashfs_get_cached_block(s, sinodeb, block, offset, | ||
778 | + sizeof(*sinodeb), &next_block, &next_offset)) | ||
779 | + goto failed_read; | ||
780 | + SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb, sizeof(*sinodeb)); | ||
781 | + } else | ||
782 | + if (!squashfs_get_cached_block(s, inodeb, block, offset, | ||
783 | + sizeof(*inodeb), &next_block, &next_offset)) | ||
784 | + goto failed_read; | ||
785 | + | ||
786 | + squashfs_new_inode(msblk, i, inodeb); | ||
787 | + | ||
788 | + switch(inodeb->inode_type) { | ||
789 | + case SQUASHFS_FILE_TYPE: { | ||
790 | + unsigned int frag_size; | ||
791 | + long long frag_blk; | ||
792 | + struct squashfs_reg_inode_header *inodep = &id.reg; | ||
793 | + struct squashfs_reg_inode_header *sinodep = &sid.reg; | ||
794 | + | ||
795 | + if (msblk->swap) { | ||
796 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | ||
797 | + sizeof(*sinodep), &next_block, &next_offset)) | ||
798 | + goto failed_read; | ||
799 | + SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep); | ||
800 | + } else | ||
801 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | ||
802 | + sizeof(*inodep), &next_block, &next_offset)) | ||
803 | + goto failed_read; | ||
804 | + | ||
805 | + frag_blk = SQUASHFS_INVALID_BLK; | ||
806 | + | ||
807 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG) | ||
808 | + if(!get_fragment_location(s, inodep->fragment, &frag_blk, | ||
809 | + &frag_size)) | ||
810 | + goto failed_read; | ||
811 | + | ||
812 | + i->i_nlink = 1; | ||
813 | + i->i_size = inodep->file_size; | ||
814 | + i->i_fop = &generic_ro_fops; | ||
815 | + i->i_mode |= S_IFREG; | ||
816 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; | ||
817 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; | ||
818 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; | ||
819 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; | ||
820 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
821 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; | ||
822 | + SQUASHFS_I(i)->offset = next_offset; | ||
823 | + i->i_data.a_ops = &squashfs_aops; | ||
824 | + | ||
825 | + TRACE("File inode %x:%x, start_block %llx, " | ||
826 | + "block_list_start %llx, offset %x\n", | ||
827 | + SQUASHFS_INODE_BLK(inode), offset, | ||
828 | + inodep->start_block, next_block, | ||
829 | + next_offset); | ||
830 | + break; | ||
831 | + } | ||
832 | + case SQUASHFS_LREG_TYPE: { | ||
833 | + unsigned int frag_size; | ||
834 | + long long frag_blk; | ||
835 | + struct squashfs_lreg_inode_header *inodep = &id.lreg; | ||
836 | + struct squashfs_lreg_inode_header *sinodep = &sid.lreg; | ||
837 | + | ||
838 | + if (msblk->swap) { | ||
839 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | ||
840 | + sizeof(*sinodep), &next_block, &next_offset)) | ||
841 | + goto failed_read; | ||
842 | + SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep); | ||
843 | + } else | ||
844 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | ||
845 | + sizeof(*inodep), &next_block, &next_offset)) | ||
846 | + goto failed_read; | ||
847 | + | ||
848 | + frag_blk = SQUASHFS_INVALID_BLK; | ||
849 | + | ||
850 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG) | ||
851 | + if (!get_fragment_location(s, inodep->fragment, &frag_blk, | ||
852 | + &frag_size)) | ||
853 | + goto failed_read; | ||
854 | + | ||
855 | + i->i_nlink = inodep->nlink; | ||
856 | + i->i_size = inodep->file_size; | ||
857 | + i->i_fop = &generic_ro_fops; | ||
858 | + i->i_mode |= S_IFREG; | ||
859 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; | ||
860 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; | ||
861 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; | ||
862 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; | ||
863 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
864 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; | ||
865 | + SQUASHFS_I(i)->offset = next_offset; | ||
866 | + i->i_data.a_ops = &squashfs_aops; | ||
867 | + | ||
868 | + TRACE("File inode %x:%x, start_block %llx, " | ||
869 | + "block_list_start %llx, offset %x\n", | ||
870 | + SQUASHFS_INODE_BLK(inode), offset, | ||
871 | + inodep->start_block, next_block, | ||
872 | + next_offset); | ||
873 | + break; | ||
874 | + } | ||
875 | + case SQUASHFS_DIR_TYPE: { | ||
876 | + struct squashfs_dir_inode_header *inodep = &id.dir; | ||
877 | + struct squashfs_dir_inode_header *sinodep = &sid.dir; | ||
878 | + | ||
879 | + if (msblk->swap) { | ||
880 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | ||
881 | + sizeof(*sinodep), &next_block, &next_offset)) | ||
882 | + goto failed_read; | ||
883 | + SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep); | ||
884 | + } else | ||
885 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | ||
886 | + sizeof(*inodep), &next_block, &next_offset)) | ||
887 | + goto failed_read; | ||
888 | + | ||
889 | + i->i_nlink = inodep->nlink; | ||
890 | + i->i_size = inodep->file_size; | ||
891 | + i->i_op = &squashfs_dir_inode_ops; | ||
892 | + i->i_fop = &squashfs_dir_ops; | ||
893 | + i->i_mode |= S_IFDIR; | ||
894 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
895 | + SQUASHFS_I(i)->offset = inodep->offset; | ||
896 | + SQUASHFS_I(i)->u.s2.directory_index_count = 0; | ||
897 | + SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode; | ||
898 | + | ||
899 | + TRACE("Directory inode %x:%x, start_block %x, offset " | ||
900 | + "%x\n", SQUASHFS_INODE_BLK(inode), | ||
901 | + offset, inodep->start_block, | ||
902 | + inodep->offset); | ||
903 | + break; | ||
904 | + } | ||
905 | + case SQUASHFS_LDIR_TYPE: { | ||
906 | + struct squashfs_ldir_inode_header *inodep = &id.ldir; | ||
907 | + struct squashfs_ldir_inode_header *sinodep = &sid.ldir; | ||
908 | + | ||
909 | + if (msblk->swap) { | ||
910 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | ||
911 | + sizeof(*sinodep), &next_block, &next_offset)) | ||
912 | + goto failed_read; | ||
913 | + SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep, sinodep); | ||
914 | + } else | ||
915 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | ||
916 | + sizeof(*inodep), &next_block, &next_offset)) | ||
917 | + goto failed_read; | ||
918 | + | ||
919 | + i->i_nlink = inodep->nlink; | ||
920 | + i->i_size = inodep->file_size; | ||
921 | + i->i_op = &squashfs_dir_inode_ops; | ||
922 | + i->i_fop = &squashfs_dir_ops; | ||
923 | + i->i_mode |= S_IFDIR; | ||
924 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
925 | + SQUASHFS_I(i)->offset = inodep->offset; | ||
926 | + SQUASHFS_I(i)->u.s2.directory_index_start = next_block; | ||
927 | + SQUASHFS_I(i)->u.s2.directory_index_offset = next_offset; | ||
928 | + SQUASHFS_I(i)->u.s2.directory_index_count = inodep->i_count; | ||
929 | + SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode; | ||
930 | + | ||
931 | + TRACE("Long directory inode %x:%x, start_block %x, offset %x\n", | ||
932 | + SQUASHFS_INODE_BLK(inode), offset, | ||
933 | + inodep->start_block, inodep->offset); | ||
934 | + break; | ||
935 | + } | ||
936 | + case SQUASHFS_SYMLINK_TYPE: { | ||
937 | + struct squashfs_symlink_inode_header *inodep = &id.symlink; | ||
938 | + struct squashfs_symlink_inode_header *sinodep = &sid.symlink; | ||
939 | + | ||
940 | + if (msblk->swap) { | ||
941 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | ||
942 | + sizeof(*sinodep), &next_block, &next_offset)) | ||
943 | + goto failed_read; | ||
944 | + SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep, sinodep); | ||
945 | + } else | ||
946 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | ||
947 | + sizeof(*inodep), &next_block, &next_offset)) | ||
948 | + goto failed_read; | ||
949 | + | ||
950 | + i->i_nlink = inodep->nlink; | ||
951 | + i->i_size = inodep->symlink_size; | ||
952 | + i->i_op = &page_symlink_inode_operations; | ||
953 | + i->i_data.a_ops = &squashfs_symlink_aops; | ||
954 | + i->i_mode |= S_IFLNK; | ||
955 | + SQUASHFS_I(i)->start_block = next_block; | ||
956 | + SQUASHFS_I(i)->offset = next_offset; | ||
957 | + | ||
958 | + TRACE("Symbolic link inode %x:%x, start_block %llx, offset %x\n", | ||
959 | + SQUASHFS_INODE_BLK(inode), offset, | ||
960 | + next_block, next_offset); | ||
961 | + break; | ||
962 | + } | ||
963 | + case SQUASHFS_BLKDEV_TYPE: | ||
964 | + case SQUASHFS_CHRDEV_TYPE: { | ||
965 | + struct squashfs_dev_inode_header *inodep = &id.dev; | ||
966 | + struct squashfs_dev_inode_header *sinodep = &sid.dev; | ||
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_DEV_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_mode |= (inodeb->inode_type == SQUASHFS_CHRDEV_TYPE) ? | ||
980 | + S_IFCHR : S_IFBLK; | ||
981 | + init_special_inode(i, i->i_mode, old_decode_dev(inodep->rdev)); | ||
982 | + | ||
983 | + TRACE("Device inode %x:%x, rdev %x\n", | ||
984 | + SQUASHFS_INODE_BLK(inode), offset, inodep->rdev); | ||
985 | + break; | ||
986 | + } | ||
987 | + case SQUASHFS_FIFO_TYPE: | ||
988 | + case SQUASHFS_SOCKET_TYPE: { | ||
989 | + struct squashfs_ipc_inode_header *inodep = &id.ipc; | ||
990 | + struct squashfs_ipc_inode_header *sinodep = &sid.ipc; | ||
991 | + | ||
992 | + if (msblk->swap) { | ||
993 | + if (!squashfs_get_cached_block(s, sinodep, block, offset, | ||
994 | + sizeof(*sinodep), &next_block, &next_offset)) | ||
995 | + goto failed_read; | ||
996 | + SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep); | ||
997 | + } else | ||
998 | + if (!squashfs_get_cached_block(s, inodep, block, offset, | ||
999 | + sizeof(*inodep), &next_block, &next_offset)) | ||
1000 | + goto failed_read; | ||
1001 | + | ||
1002 | + i->i_nlink = inodep->nlink; | ||
1003 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE) | ||
1004 | + ? S_IFIFO : S_IFSOCK; | ||
1005 | + init_special_inode(i, i->i_mode, 0); | ||
1006 | + break; | ||
1007 | + } | ||
1008 | + default: | ||
1009 | + ERROR("Unknown inode type %d in squashfs_iget!\n", | ||
1010 | + inodeb->inode_type); | ||
1011 | + goto failed_read1; | ||
1012 | + } | ||
1013 | + | ||
1014 | + return 1; | ||
1015 | + | ||
1016 | +failed_read: | ||
1017 | + ERROR("Unable to read inode [%llx:%x]\n", block, offset); | ||
1018 | + | ||
1019 | +failed_read1: | ||
1020 | + make_bad_inode(i); | ||
1021 | + return 0; | ||
1022 | +} | ||
1023 | + | ||
1024 | + | ||
1025 | +static int read_inode_lookup_table(struct super_block *s) | ||
1026 | +{ | ||
1027 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
1028 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1029 | + unsigned int length = SQUASHFS_LOOKUP_BLOCK_BYTES(sblk->inodes); | ||
1030 | + | ||
1031 | + TRACE("In read_inode_lookup_table, length %d\n", length); | ||
1032 | + | ||
1033 | + /* Allocate inode lookup table */ | ||
1034 | + msblk->inode_lookup_table = kmalloc(length, GFP_KERNEL); | ||
1035 | + if (msblk->inode_lookup_table == NULL) { | ||
1036 | + ERROR("Failed to allocate inode lookup table\n"); | ||
1037 | + return 0; | ||
1038 | + } | ||
1039 | + | ||
1040 | + if (!squashfs_read_data(s, (char *) msblk->inode_lookup_table, | ||
1041 | + sblk->lookup_table_start, length | | ||
1042 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length)) { | ||
1043 | + ERROR("unable to read inode lookup table\n"); | ||
1044 | + return 0; | ||
1045 | + } | ||
1046 | + | ||
1047 | + if (msblk->swap) { | ||
1048 | + int i; | ||
1049 | + long long block; | ||
1050 | + | ||
1051 | + for (i = 0; i < SQUASHFS_LOOKUP_BLOCKS(sblk->inodes); i++) { | ||
1052 | + /* XXX */ | ||
1053 | + SQUASHFS_SWAP_LOOKUP_BLOCKS((&block), | ||
1054 | + &msblk->inode_lookup_table[i], 1); | ||
1055 | + msblk->inode_lookup_table[i] = block; | ||
1056 | + } | ||
1057 | + } | ||
1058 | + | ||
1059 | + return 1; | ||
1060 | +} | ||
1061 | + | ||
1062 | + | ||
1063 | +static int read_fragment_index_table(struct super_block *s) | ||
1064 | +{ | ||
1065 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
1066 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1067 | + unsigned int length = SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments); | ||
1068 | + | ||
1069 | + if(length == 0) | ||
1070 | + return 1; | ||
1071 | + | ||
1072 | + /* Allocate fragment index table */ | ||
1073 | + msblk->fragment_index = kmalloc(length, GFP_KERNEL); | ||
1074 | + if (msblk->fragment_index == NULL) { | ||
1075 | + ERROR("Failed to allocate fragment index table\n"); | ||
1076 | + return 0; | ||
1077 | + } | ||
1078 | + | ||
1079 | + if (!squashfs_read_data(s, (char *) msblk->fragment_index, | ||
1080 | + sblk->fragment_table_start, length | | ||
1081 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length)) { | ||
1082 | + ERROR("unable to read fragment index table\n"); | ||
1083 | + return 0; | ||
1084 | + } | ||
1085 | + | ||
1086 | + if (msblk->swap) { | ||
1087 | + int i; | ||
1088 | + long long fragment; | ||
1089 | + | ||
1090 | + for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments); i++) { | ||
1091 | + /* XXX */ | ||
1092 | + SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment), | ||
1093 | + &msblk->fragment_index[i], 1); | ||
1094 | + msblk->fragment_index[i] = fragment; | ||
1095 | + } | ||
1096 | + } | ||
1097 | + | ||
1098 | + return 1; | ||
1099 | +} | ||
1100 | + | ||
1101 | + | ||
1102 | +static int readahead_metadata(struct super_block *s) | ||
1103 | +{ | ||
1104 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
1105 | + int i; | ||
1106 | + | ||
1107 | + squashfs_cached_blks = SQUASHFS_CACHED_BLKS; | ||
1108 | + | ||
1109 | + /* Init inode_table block pointer array */ | ||
1110 | + msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) * | ||
1111 | + squashfs_cached_blks, GFP_KERNEL); | ||
1112 | + if (msblk->block_cache == NULL) { | ||
1113 | + ERROR("Failed to allocate block cache\n"); | ||
1114 | + goto failed; | ||
1115 | + } | ||
1116 | + | ||
1117 | + for (i = 0; i < squashfs_cached_blks; i++) | ||
1118 | + msblk->block_cache[i].block = SQUASHFS_INVALID_BLK; | ||
1119 | + | ||
1120 | + msblk->next_cache = 0; | ||
1121 | + msblk->unused_cache_blks = squashfs_cached_blks; | ||
1122 | + | ||
1123 | + return 1; | ||
1124 | + | ||
1125 | +failed: | ||
1126 | + return 0; | ||
1127 | +} | ||
1128 | + | ||
1129 | + | ||
1130 | +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent) | ||
1131 | +{ | ||
1132 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1133 | + | ||
1134 | + msblk->read_inode = squashfs_read_inode; | ||
1135 | + msblk->read_blocklist = read_blocklist; | ||
1136 | + msblk->read_fragment_index_table = read_fragment_index_table; | ||
1137 | + | ||
1138 | + if (sblk->s_major == 1) { | ||
1139 | + if (!squashfs_1_0_supported(msblk)) { | ||
1140 | + SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems " | ||
1141 | + "are unsupported\n"); | ||
1142 | + SERROR("Please recompile with Squashfs 1.0 support enabled\n"); | ||
1143 | + return 0; | ||
1144 | + } | ||
1145 | + } else if (sblk->s_major == 2) { | ||
1146 | + if (!squashfs_2_0_supported(msblk)) { | ||
1147 | + SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems " | ||
1148 | + "are unsupported\n"); | ||
1149 | + SERROR("Please recompile with Squashfs 2.0 support enabled\n"); | ||
1150 | + return 0; | ||
1151 | + } | ||
1152 | + } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor > | ||
1153 | + SQUASHFS_MINOR) { | ||
1154 | + SERROR("Major/Minor mismatch, trying to mount newer %d.%d " | ||
1155 | + "filesystem\n", sblk->s_major, sblk->s_minor); | ||
1156 | + SERROR("Please update your kernel\n"); | ||
1157 | + return 0; | ||
1158 | + } | ||
1159 | + | ||
1160 | + return 1; | ||
1161 | +} | ||
1162 | + | ||
1163 | + | ||
1164 | +static int squashfs_fill_super(struct super_block *s, void *data, int silent) | ||
1165 | +{ | ||
1166 | + struct squashfs_sb_info *msblk; | ||
1167 | + struct squashfs_super_block *sblk; | ||
1168 | + int i; | ||
1169 | + char b[BDEVNAME_SIZE]; | ||
1170 | + struct inode *root; | ||
1171 | + | ||
1172 | + TRACE("Entered squashfs_fill_superblock\n"); | ||
1173 | + | ||
1174 | + s->s_fs_info = kzalloc(sizeof(struct squashfs_sb_info), GFP_KERNEL); | ||
1175 | + if (s->s_fs_info == NULL) { | ||
1176 | + ERROR("Failed to allocate superblock\n"); | ||
1177 | + goto failure; | ||
1178 | + } | ||
1179 | + msblk = s->s_fs_info; | ||
1180 | + | ||
1181 | + msblk->stream.workspace = vmalloc(zlib_inflate_workspacesize()); | ||
1182 | + if (msblk->stream.workspace == NULL) { | ||
1183 | + ERROR("Failed to allocate zlib workspace\n"); | ||
1184 | + goto failure; | ||
1185 | + } | ||
1186 | + sblk = &msblk->sblk; | ||
1187 | + | ||
1188 | + msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE); | ||
1189 | + msblk->devblksize_log2 = ffz(~msblk->devblksize); | ||
1190 | + | ||
1191 | + mutex_init(&msblk->read_data_mutex); | ||
1192 | + mutex_init(&msblk->read_page_mutex); | ||
1193 | + mutex_init(&msblk->block_cache_mutex); | ||
1194 | + mutex_init(&msblk->fragment_mutex); | ||
1195 | + mutex_init(&msblk->meta_index_mutex); | ||
1196 | + | ||
1197 | + init_waitqueue_head(&msblk->waitq); | ||
1198 | + init_waitqueue_head(&msblk->fragment_wait_queue); | ||
1199 | + | ||
1200 | + /* sblk->bytes_used is checked in squashfs_read_data to ensure reads are not | ||
1201 | + * beyond filesystem end. As we're using squashfs_read_data to read sblk here, | ||
1202 | + * first set sblk->bytes_used to a useful value */ | ||
1203 | + sblk->bytes_used = sizeof(struct squashfs_super_block); | ||
1204 | + if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START, | ||
1205 | + sizeof(struct squashfs_super_block) | | ||
1206 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, sizeof(struct squashfs_super_block))) { | ||
1207 | + SERROR("unable to read superblock\n"); | ||
1208 | + goto failed_mount; | ||
1209 | + } | ||
1210 | + | ||
1211 | + /* Check it is a SQUASHFS superblock */ | ||
1212 | + if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) { | ||
1213 | + if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) { | ||
1214 | + struct squashfs_super_block ssblk; | ||
1215 | + | ||
1216 | + WARNING("Mounting a different endian SQUASHFS filesystem on %s\n", | ||
1217 | + bdevname(s->s_bdev, b)); | ||
1218 | + | ||
1219 | + SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk); | ||
1220 | + memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block)); | ||
1221 | + msblk->swap = 1; | ||
1222 | + } else { | ||
1223 | + SERROR("Can't find a SQUASHFS superblock on %s\n", | ||
1224 | + bdevname(s->s_bdev, b)); | ||
1225 | + goto failed_mount; | ||
1226 | + } | ||
1227 | + } | ||
1228 | + | ||
1229 | + /* Check the MAJOR & MINOR versions */ | ||
1230 | + if(!supported_squashfs_filesystem(msblk, silent)) | ||
1231 | + goto failed_mount; | ||
1232 | + | ||
1233 | + /* Check the filesystem does not extend beyond the end of the | ||
1234 | + block device */ | ||
1235 | + if(sblk->bytes_used < 0 || sblk->bytes_used > i_size_read(s->s_bdev->bd_inode)) | ||
1236 | + goto failed_mount; | ||
1237 | + | ||
1238 | + /* Check the root inode for sanity */ | ||
1239 | + if (SQUASHFS_INODE_OFFSET(sblk->root_inode) > SQUASHFS_METADATA_SIZE) | ||
1240 | + goto failed_mount; | ||
1241 | + | ||
1242 | + TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b)); | ||
1243 | + TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(sblk->flags) | ||
1244 | + ? "un" : ""); | ||
1245 | + TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(sblk->flags) | ||
1246 | + ? "un" : ""); | ||
1247 | + TRACE("Check data is %spresent in the filesystem\n", | ||
1248 | + SQUASHFS_CHECK_DATA(sblk->flags) ? "" : "not "); | ||
1249 | + TRACE("Filesystem size %lld bytes\n", sblk->bytes_used); | ||
1250 | + TRACE("Block size %d\n", sblk->block_size); | ||
1251 | + TRACE("Number of inodes %d\n", sblk->inodes); | ||
1252 | + if (sblk->s_major > 1) | ||
1253 | + TRACE("Number of fragments %d\n", sblk->fragments); | ||
1254 | + TRACE("Number of uids %d\n", sblk->no_uids); | ||
1255 | + TRACE("Number of gids %d\n", sblk->no_guids); | ||
1256 | + TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start); | ||
1257 | + TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start); | ||
1258 | + if (sblk->s_major > 1) | ||
1259 | + TRACE("sblk->fragment_table_start %llx\n", sblk->fragment_table_start); | ||
1260 | + TRACE("sblk->uid_start %llx\n", sblk->uid_start); | ||
1261 | + | ||
1262 | + s->s_maxbytes = MAX_LFS_FILESIZE; | ||
1263 | + s->s_flags |= MS_RDONLY; | ||
1264 | + s->s_op = &squashfs_super_ops; | ||
1265 | + | ||
1266 | + if (readahead_metadata(s) == 0) | ||
1267 | + goto failed_mount; | ||
1268 | + | ||
1269 | + /* Allocate read_page block */ | ||
1270 | + msblk->read_page = vmalloc(sblk->block_size); | ||
1271 | + if (msblk->read_page == NULL) { | ||
1272 | + ERROR("Failed to allocate read_page block\n"); | ||
1273 | + goto failed_mount; | ||
1274 | + } | ||
1275 | + | ||
1276 | + /* Allocate uid and gid tables */ | ||
1277 | + msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) * | ||
1278 | + sizeof(unsigned int), GFP_KERNEL); | ||
1279 | + if (msblk->uid == NULL) { | ||
1280 | + ERROR("Failed to allocate uid/gid table\n"); | ||
1281 | + goto failed_mount; | ||
1282 | + } | ||
1283 | + msblk->guid = msblk->uid + sblk->no_uids; | ||
1284 | + | ||
1285 | + if (msblk->swap) { | ||
1286 | + unsigned int suid[sblk->no_uids + sblk->no_guids]; | ||
1287 | + | ||
1288 | + if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start, | ||
1289 | + ((sblk->no_uids + sblk->no_guids) * | ||
1290 | + sizeof(unsigned int)) | | ||
1291 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) { | ||
1292 | + ERROR("unable to read uid/gid table\n"); | ||
1293 | + goto failed_mount; | ||
1294 | + } | ||
1295 | + | ||
1296 | + SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids + | ||
1297 | + sblk->no_guids), (sizeof(unsigned int) * 8)); | ||
1298 | + } else | ||
1299 | + if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start, | ||
1300 | + ((sblk->no_uids + sblk->no_guids) * | ||
1301 | + sizeof(unsigned int)) | | ||
1302 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) { | ||
1303 | + ERROR("unable to read uid/gid table\n"); | ||
1304 | + goto failed_mount; | ||
1305 | + } | ||
1306 | + | ||
1307 | + | ||
1308 | + if (sblk->s_major == 1 && squashfs_1_0_supported(msblk)) | ||
1309 | + goto allocate_root; | ||
1310 | + | ||
1311 | + msblk->fragment = kzalloc(sizeof(struct squashfs_fragment_cache) * | ||
1312 | + SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL); | ||
1313 | + if (msblk->fragment == NULL) { | ||
1314 | + ERROR("Failed to allocate fragment block cache\n"); | ||
1315 | + goto failed_mount; | ||
1316 | + } | ||
1317 | + | ||
1318 | + for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) { | ||
1319 | + msblk->fragment[i].block = SQUASHFS_INVALID_BLK; | ||
1320 | + } | ||
1321 | + | ||
1322 | + msblk->next_fragment = 0; | ||
1323 | + msblk->unused_frag_blks = SQUASHFS_CACHED_FRAGMENTS; | ||
1324 | + | ||
1325 | + /* Allocate and read fragment index table */ | ||
1326 | + if (msblk->read_fragment_index_table(s) == 0) | ||
1327 | + goto failed_mount; | ||
1328 | + | ||
1329 | + if(sblk->s_major < 3 || sblk->lookup_table_start == SQUASHFS_INVALID_BLK) | ||
1330 | + goto allocate_root; | ||
1331 | + | ||
1332 | + /* Allocate and read inode lookup table */ | ||
1333 | + if (read_inode_lookup_table(s) == 0) | ||
1334 | + goto failed_mount; | ||
1335 | + | ||
1336 | + s->s_op = &squashfs_export_super_ops; | ||
1337 | + s->s_export_op = &squashfs_export_ops; | ||
1338 | + | ||
1339 | +allocate_root: | ||
1340 | + root = new_inode(s); | ||
1341 | + if ((msblk->read_inode)(root, sblk->root_inode) == 0) | ||
1342 | + goto failed_mount; | ||
1343 | + insert_inode_hash(root); | ||
1344 | + | ||
1345 | + s->s_root = d_alloc_root(root); | ||
1346 | + if (s->s_root == NULL) { | ||
1347 | + ERROR("Root inode create failed\n"); | ||
1348 | + iput(root); | ||
1349 | + goto failed_mount; | ||
1350 | + } | ||
1351 | + | ||
1352 | + TRACE("Leaving squashfs_fill_super\n"); | ||
1353 | + return 0; | ||
1354 | + | ||
1355 | +failed_mount: | ||
1356 | + kfree(msblk->inode_lookup_table); | ||
1357 | + kfree(msblk->fragment_index); | ||
1358 | + kfree(msblk->fragment); | ||
1359 | + kfree(msblk->uid); | ||
1360 | + vfree(msblk->read_page); | ||
1361 | + kfree(msblk->block_cache); | ||
1362 | + kfree(msblk->fragment_index_2); | ||
1363 | + vfree(msblk->stream.workspace); | ||
1364 | + kfree(s->s_fs_info); | ||
1365 | + s->s_fs_info = NULL; | ||
1366 | + return -EINVAL; | ||
1367 | + | ||
1368 | +failure: | ||
1369 | + return -ENOMEM; | ||
1370 | +} | ||
1371 | + | ||
1372 | + | ||
1373 | +static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) | ||
1374 | +{ | ||
1375 | + struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; | ||
1376 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1377 | + | ||
1378 | + TRACE("Entered squashfs_statfs\n"); | ||
1379 | + | ||
1380 | + buf->f_type = SQUASHFS_MAGIC; | ||
1381 | + buf->f_bsize = sblk->block_size; | ||
1382 | + buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1; | ||
1383 | + buf->f_bfree = buf->f_bavail = 0; | ||
1384 | + buf->f_files = sblk->inodes; | ||
1385 | + buf->f_ffree = 0; | ||
1386 | + buf->f_namelen = SQUASHFS_NAME_LEN; | ||
1387 | + | ||
1388 | + return 0; | ||
1389 | +} | ||
1390 | + | ||
1391 | + | ||
1392 | +static int squashfs_symlink_readpage(struct file *file, struct page *page) | ||
1393 | +{ | ||
1394 | + struct inode *inode = page->mapping->host; | ||
1395 | + int index = page->index << PAGE_CACHE_SHIFT, length, bytes, avail_bytes; | ||
1396 | + long long block = SQUASHFS_I(inode)->start_block; | ||
1397 | + int offset = SQUASHFS_I(inode)->offset; | ||
1398 | + void *pageaddr = kmap(page); | ||
1399 | + | ||
1400 | + TRACE("Entered squashfs_symlink_readpage, page index %ld, start block " | ||
1401 | + "%llx, offset %x\n", page->index, | ||
1402 | + SQUASHFS_I(inode)->start_block, | ||
1403 | + SQUASHFS_I(inode)->offset); | ||
1404 | + | ||
1405 | + for (length = 0; length < index; length += bytes) { | ||
1406 | + bytes = squashfs_get_cached_block(inode->i_sb, NULL, block, | ||
1407 | + offset, PAGE_CACHE_SIZE, &block, &offset); | ||
1408 | + if (bytes == 0) { | ||
1409 | + ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset); | ||
1410 | + goto skip_read; | ||
1411 | + } | ||
1412 | + } | ||
1413 | + | ||
1414 | + if (length != index) { | ||
1415 | + ERROR("(squashfs_symlink_readpage) length != index\n"); | ||
1416 | + bytes = 0; | ||
1417 | + goto skip_read; | ||
1418 | + } | ||
1419 | + | ||
1420 | + avail_bytes = min_t(int, i_size_read(inode) - length, PAGE_CACHE_SIZE); | ||
1421 | + | ||
1422 | + bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block, offset, | ||
1423 | + avail_bytes, &block, &offset); | ||
1424 | + if (bytes == 0) | ||
1425 | + ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset); | ||
1426 | + | ||
1427 | +skip_read: | ||
1428 | + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); | ||
1429 | + kunmap(page); | ||
1430 | + flush_dcache_page(page); | ||
1431 | + SetPageUptodate(page); | ||
1432 | + unlock_page(page); | ||
1433 | + | ||
1434 | + return 0; | ||
1435 | +} | ||
1436 | + | ||
1437 | + | ||
1438 | +struct meta_index *locate_meta_index(struct inode *inode, int index, int offset) | ||
1439 | +{ | ||
1440 | + struct meta_index *meta = NULL; | ||
1441 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | ||
1442 | + int i; | ||
1443 | + | ||
1444 | + mutex_lock(&msblk->meta_index_mutex); | ||
1445 | + | ||
1446 | + TRACE("locate_meta_index: index %d, offset %d\n", index, offset); | ||
1447 | + | ||
1448 | + if (msblk->meta_index == NULL) | ||
1449 | + goto not_allocated; | ||
1450 | + | ||
1451 | + for (i = 0; i < SQUASHFS_META_NUMBER; i ++) { | ||
1452 | + if (msblk->meta_index[i].inode_number == inode->i_ino && | ||
1453 | + msblk->meta_index[i].offset >= offset && | ||
1454 | + msblk->meta_index[i].offset <= index && | ||
1455 | + msblk->meta_index[i].locked == 0) { | ||
1456 | + TRACE("locate_meta_index: entry %d, offset %d\n", i, | ||
1457 | + msblk->meta_index[i].offset); | ||
1458 | + meta = &msblk->meta_index[i]; | ||
1459 | + offset = meta->offset; | ||
1460 | + } | ||
1461 | + } | ||
1462 | + | ||
1463 | + if (meta) | ||
1464 | + meta->locked = 1; | ||
1465 | + | ||
1466 | +not_allocated: | ||
1467 | + mutex_unlock(&msblk->meta_index_mutex); | ||
1468 | + | ||
1469 | + return meta; | ||
1470 | +} | ||
1471 | + | ||
1472 | + | ||
1473 | +struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip) | ||
1474 | +{ | ||
1475 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | ||
1476 | + struct meta_index *meta = NULL; | ||
1477 | + int i; | ||
1478 | + | ||
1479 | + mutex_lock(&msblk->meta_index_mutex); | ||
1480 | + | ||
1481 | + TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip); | ||
1482 | + | ||
1483 | + if (msblk->meta_index == NULL) { | ||
1484 | + msblk->meta_index = kmalloc(sizeof(struct meta_index) * | ||
1485 | + SQUASHFS_META_NUMBER, GFP_KERNEL); | ||
1486 | + if (msblk->meta_index == NULL) { | ||
1487 | + ERROR("Failed to allocate meta_index\n"); | ||
1488 | + goto failed; | ||
1489 | + } | ||
1490 | + for (i = 0; i < SQUASHFS_META_NUMBER; i++) { | ||
1491 | + msblk->meta_index[i].inode_number = 0; | ||
1492 | + msblk->meta_index[i].locked = 0; | ||
1493 | + } | ||
1494 | + msblk->next_meta_index = 0; | ||
1495 | + } | ||
1496 | + | ||
1497 | + for (i = SQUASHFS_META_NUMBER; i && | ||
1498 | + msblk->meta_index[msblk->next_meta_index].locked; i --) | ||
1499 | + msblk->next_meta_index = (msblk->next_meta_index + 1) % | ||
1500 | + SQUASHFS_META_NUMBER; | ||
1501 | + | ||
1502 | + if (i == 0) { | ||
1503 | + TRACE("empty_meta_index: failed!\n"); | ||
1504 | + goto failed; | ||
1505 | + } | ||
1506 | + | ||
1507 | + TRACE("empty_meta_index: returned meta entry %d, %p\n", | ||
1508 | + msblk->next_meta_index, | ||
1509 | + &msblk->meta_index[msblk->next_meta_index]); | ||
1510 | + | ||
1511 | + meta = &msblk->meta_index[msblk->next_meta_index]; | ||
1512 | + msblk->next_meta_index = (msblk->next_meta_index + 1) % | ||
1513 | + SQUASHFS_META_NUMBER; | ||
1514 | + | ||
1515 | + meta->inode_number = inode->i_ino; | ||
1516 | + meta->offset = offset; | ||
1517 | + meta->skip = skip; | ||
1518 | + meta->entries = 0; | ||
1519 | + meta->locked = 1; | ||
1520 | + | ||
1521 | +failed: | ||
1522 | + mutex_unlock(&msblk->meta_index_mutex); | ||
1523 | + return meta; | ||
1524 | +} | ||
1525 | + | ||
1526 | + | ||
1527 | +void release_meta_index(struct inode *inode, struct meta_index *meta) | ||
1528 | +{ | ||
1529 | + meta->locked = 0; | ||
1530 | + smp_mb(); | ||
1531 | +} | ||
1532 | + | ||
1533 | + | ||
1534 | +static int read_block_index(struct super_block *s, int blocks, char *block_list, | ||
1535 | + long long *start_block, int *offset) | ||
1536 | +{ | ||
1537 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
1538 | + unsigned int *block_listp; | ||
1539 | + int block = 0; | ||
1540 | + | ||
1541 | + if (msblk->swap) { | ||
1542 | + char sblock_list[blocks << 2]; | ||
1543 | + | ||
1544 | + if (!squashfs_get_cached_block(s, sblock_list, *start_block, | ||
1545 | + *offset, blocks << 2, start_block, offset)) { | ||
1546 | + ERROR("Fail reading block list [%llx:%x]\n", *start_block, *offset); | ||
1547 | + goto failure; | ||
1548 | + } | ||
1549 | + SQUASHFS_SWAP_INTS(((unsigned int *)block_list), | ||
1550 | + ((unsigned int *)sblock_list), blocks); | ||
1551 | + } else { | ||
1552 | + if (!squashfs_get_cached_block(s, block_list, *start_block, | ||
1553 | + *offset, blocks << 2, start_block, offset)) { | ||
1554 | + ERROR("Fail reading block list [%llx:%x]\n", *start_block, *offset); | ||
1555 | + goto failure; | ||
1556 | + } | ||
1557 | + } | ||
1558 | + | ||
1559 | + for (block_listp = (unsigned int *) block_list; blocks; | ||
1560 | + block_listp++, blocks --) | ||
1561 | + block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp); | ||
1562 | + | ||
1563 | + return block; | ||
1564 | + | ||
1565 | +failure: | ||
1566 | + return -1; | ||
1567 | +} | ||
1568 | + | ||
1569 | + | ||
1570 | +#define SIZE 256 | ||
1571 | + | ||
1572 | +static inline int calculate_skip(int blocks) { | ||
1573 | + int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES); | ||
1574 | + return skip >= 7 ? 7 : skip + 1; | ||
1575 | +} | ||
1576 | + | ||
1577 | + | ||
1578 | +static int get_meta_index(struct inode *inode, int index, | ||
1579 | + long long *index_block, int *index_offset, | ||
1580 | + long long *data_block, char *block_list) | ||
1581 | +{ | ||
1582 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | ||
1583 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1584 | + int skip = calculate_skip(i_size_read(inode) >> sblk->block_log); | ||
1585 | + int offset = 0; | ||
1586 | + struct meta_index *meta; | ||
1587 | + struct meta_entry *meta_entry; | ||
1588 | + long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start; | ||
1589 | + int cur_offset = SQUASHFS_I(inode)->offset; | ||
1590 | + long long cur_data_block = SQUASHFS_I(inode)->start_block; | ||
1591 | + int i; | ||
1592 | + | ||
1593 | + index /= SQUASHFS_META_INDEXES * skip; | ||
1594 | + | ||
1595 | + while (offset < index) { | ||
1596 | + meta = locate_meta_index(inode, index, offset + 1); | ||
1597 | + | ||
1598 | + if (meta == NULL) { | ||
1599 | + meta = empty_meta_index(inode, offset + 1, skip); | ||
1600 | + if (meta == NULL) | ||
1601 | + goto all_done; | ||
1602 | + } else { | ||
1603 | + if(meta->entries == 0) | ||
1604 | + goto failed; | ||
1605 | + /* XXX */ | ||
1606 | + offset = index < meta->offset + meta->entries ? index : | ||
1607 | + meta->offset + meta->entries - 1; | ||
1608 | + /* XXX */ | ||
1609 | + meta_entry = &meta->meta_entry[offset - meta->offset]; | ||
1610 | + cur_index_block = meta_entry->index_block + sblk->inode_table_start; | ||
1611 | + cur_offset = meta_entry->offset; | ||
1612 | + cur_data_block = meta_entry->data_block; | ||
1613 | + TRACE("get_meta_index: offset %d, meta->offset %d, " | ||
1614 | + "meta->entries %d\n", offset, meta->offset, meta->entries); | ||
1615 | + TRACE("get_meta_index: index_block 0x%llx, offset 0x%x" | ||
1616 | + " data_block 0x%llx\n", cur_index_block, | ||
1617 | + cur_offset, cur_data_block); | ||
1618 | + } | ||
1619 | + | ||
1620 | + for (i = meta->offset + meta->entries; i <= index && | ||
1621 | + i < meta->offset + SQUASHFS_META_ENTRIES; i++) { | ||
1622 | + int blocks = skip * SQUASHFS_META_INDEXES; | ||
1623 | + | ||
1624 | + while (blocks) { | ||
1625 | + int block = blocks > (SIZE >> 2) ? (SIZE >> 2) : blocks; | ||
1626 | + int res = read_block_index(inode->i_sb, block, block_list, | ||
1627 | + &cur_index_block, &cur_offset); | ||
1628 | + | ||
1629 | + if (res == -1) | ||
1630 | + goto failed; | ||
1631 | + | ||
1632 | + cur_data_block += res; | ||
1633 | + blocks -= block; | ||
1634 | + } | ||
1635 | + | ||
1636 | + meta_entry = &meta->meta_entry[i - meta->offset]; | ||
1637 | + meta_entry->index_block = cur_index_block - sblk->inode_table_start; | ||
1638 | + meta_entry->offset = cur_offset; | ||
1639 | + meta_entry->data_block = cur_data_block; | ||
1640 | + meta->entries ++; | ||
1641 | + offset ++; | ||
1642 | + } | ||
1643 | + | ||
1644 | + TRACE("get_meta_index: meta->offset %d, meta->entries %d\n", | ||
1645 | + meta->offset, meta->entries); | ||
1646 | + | ||
1647 | + release_meta_index(inode, meta); | ||
1648 | + } | ||
1649 | + | ||
1650 | +all_done: | ||
1651 | + *index_block = cur_index_block; | ||
1652 | + *index_offset = cur_offset; | ||
1653 | + *data_block = cur_data_block; | ||
1654 | + | ||
1655 | + return offset * SQUASHFS_META_INDEXES * skip; | ||
1656 | + | ||
1657 | +failed: | ||
1658 | + release_meta_index(inode, meta); | ||
1659 | + return -1; | ||
1660 | +} | ||
1661 | + | ||
1662 | + | ||
1663 | +static long long read_blocklist(struct inode *inode, int index, | ||
1664 | + int readahead_blks, char *block_list, | ||
1665 | + unsigned short **block_p, unsigned int *bsize) | ||
1666 | +{ | ||
1667 | + long long block_ptr; | ||
1668 | + int offset; | ||
1669 | + long long block; | ||
1670 | + int res = get_meta_index(inode, index, &block_ptr, &offset, &block, | ||
1671 | + block_list); | ||
1672 | + | ||
1673 | + TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset" | ||
1674 | + " 0x%x, block 0x%llx\n", res, index, block_ptr, offset, block); | ||
1675 | + | ||
1676 | + if(res == -1) | ||
1677 | + goto failure; | ||
1678 | + | ||
1679 | + index -= res; | ||
1680 | + | ||
1681 | + while (index) { | ||
1682 | + int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index; | ||
1683 | + int res = read_block_index(inode->i_sb, blocks, block_list, | ||
1684 | + &block_ptr, &offset); | ||
1685 | + if (res == -1) | ||
1686 | + goto failure; | ||
1687 | + block += res; | ||
1688 | + index -= blocks; | ||
1689 | + } | ||
1690 | + | ||
1691 | + if (read_block_index(inode->i_sb, 1, block_list, &block_ptr, &offset) == -1) | ||
1692 | + goto failure; | ||
1693 | + *bsize = *((unsigned int *) block_list); | ||
1694 | + | ||
1695 | + return block; | ||
1696 | + | ||
1697 | +failure: | ||
1698 | + return 0; | ||
1699 | +} | ||
1700 | + | ||
1701 | + | ||
1702 | +static int squashfs_readpage(struct file *file, struct page *page) | ||
1703 | +{ | ||
1704 | + struct inode *inode = page->mapping->host; | ||
1705 | + struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; | ||
1706 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1707 | + unsigned char *block_list = NULL; | ||
1708 | + long long block; | ||
1709 | + unsigned int bsize, i; | ||
1710 | + int bytes; | ||
1711 | + int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT); | ||
1712 | + void *pageaddr; | ||
1713 | + struct squashfs_fragment_cache *fragment = NULL; | ||
1714 | + char *data_ptr = msblk->read_page; | ||
1715 | + | ||
1716 | + int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1; | ||
1717 | + int start_index = page->index & ~mask; | ||
1718 | + int end_index = start_index | mask; | ||
1719 | + int file_end = i_size_read(inode) >> sblk->block_log; | ||
1720 | + int sparse = 0; | ||
1721 | + | ||
1722 | + TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n", | ||
1723 | + page->index, SQUASHFS_I(inode)->start_block); | ||
1724 | + | ||
1725 | + if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | ||
1726 | + PAGE_CACHE_SHIFT)) | ||
1727 | + goto out; | ||
1728 | + | ||
1729 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK | ||
1730 | + || index < file_end) { | ||
1731 | + block_list = kmalloc(SIZE, GFP_KERNEL); | ||
1732 | + if (block_list == NULL) { | ||
1733 | + ERROR("Failed to allocate block_list\n"); | ||
1734 | + goto error_out; | ||
1735 | + } | ||
1736 | + | ||
1737 | + block = (msblk->read_blocklist)(inode, index, 1, block_list, NULL, &bsize); | ||
1738 | + if (block == 0) | ||
1739 | + goto error_out; | ||
1740 | + | ||
1741 | + if (bsize == 0) { /* hole */ | ||
1742 | + bytes = index == file_end ? | ||
1743 | + (i_size_read(inode) & (sblk->block_size - 1)) : sblk->block_size; | ||
1744 | + sparse = 1; | ||
1745 | + } else { | ||
1746 | + mutex_lock(&msblk->read_page_mutex); | ||
1747 | + | ||
1748 | + bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block, | ||
1749 | + bsize, NULL, sblk->block_size); | ||
1750 | + | ||
1751 | + if (bytes == 0) { | ||
1752 | + ERROR("Unable to read page, block %llx, size %x\n", block, bsize); | ||
1753 | + mutex_unlock(&msblk->read_page_mutex); | ||
1754 | + goto error_out; | ||
1755 | + } | ||
1756 | + } | ||
1757 | + } else { | ||
1758 | + fragment = get_cached_fragment(inode->i_sb, | ||
1759 | + SQUASHFS_I(inode)-> u.s1.fragment_start_block, | ||
1760 | + SQUASHFS_I(inode)->u.s1.fragment_size); | ||
1761 | + | ||
1762 | + if (fragment == NULL) { | ||
1763 | + ERROR("Unable to read page, block %llx, size %x\n", | ||
1764 | + SQUASHFS_I(inode)->u.s1.fragment_start_block, | ||
1765 | + (int) SQUASHFS_I(inode)->u.s1.fragment_size); | ||
1766 | + goto error_out; | ||
1767 | + } | ||
1768 | + bytes = i_size_read(inode) & (sblk->block_size - 1); | ||
1769 | + data_ptr = fragment->data + SQUASHFS_I(inode)->u.s1.fragment_offset; | ||
1770 | + } | ||
1771 | + | ||
1772 | + for (i = start_index; i <= end_index && bytes > 0; i++, | ||
1773 | + bytes -= PAGE_CACHE_SIZE, data_ptr += PAGE_CACHE_SIZE) { | ||
1774 | + struct page *push_page; | ||
1775 | + int avail = sparse ? 0 : min_t(unsigned int, bytes, PAGE_CACHE_SIZE); | ||
1776 | + | ||
1777 | + TRACE("bytes %d, i %d, available_bytes %d\n", bytes, i, avail); | ||
1778 | + | ||
1779 | + push_page = (i == page->index) ? page : | ||
1780 | + grab_cache_page_nowait(page->mapping, i); | ||
1781 | + | ||
1782 | + if (!push_page) | ||
1783 | + continue; | ||
1784 | + | ||
1785 | + if (PageUptodate(push_page)) | ||
1786 | + goto skip_page; | ||
1787 | + | ||
1788 | + pageaddr = kmap_atomic(push_page, KM_USER0); | ||
1789 | + memcpy(pageaddr, data_ptr, avail); | ||
1790 | + memset(pageaddr + avail, 0, PAGE_CACHE_SIZE - avail); | ||
1791 | + kunmap_atomic(pageaddr, KM_USER0); | ||
1792 | + flush_dcache_page(push_page); | ||
1793 | + SetPageUptodate(push_page); | ||
1794 | +skip_page: | ||
1795 | + unlock_page(push_page); | ||
1796 | + if(i != page->index) | ||
1797 | + page_cache_release(push_page); | ||
1798 | + } | ||
1799 | + | ||
1800 | + if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK | ||
1801 | + || index < file_end) { | ||
1802 | + if (!sparse) | ||
1803 | + mutex_unlock(&msblk->read_page_mutex); | ||
1804 | + kfree(block_list); | ||
1805 | + } else | ||
1806 | + release_cached_fragment(msblk, fragment); | ||
1807 | + | ||
1808 | + return 0; | ||
1809 | + | ||
1810 | +error_out: | ||
1811 | + SetPageError(page); | ||
1812 | +out: | ||
1813 | + pageaddr = kmap_atomic(page, KM_USER0); | ||
1814 | + memset(pageaddr, 0, PAGE_CACHE_SIZE); | ||
1815 | + kunmap_atomic(pageaddr, KM_USER0); | ||
1816 | + flush_dcache_page(page); | ||
1817 | + if (!PageError(page)) | ||
1818 | + SetPageUptodate(page); | ||
1819 | + unlock_page(page); | ||
1820 | + | ||
1821 | + kfree(block_list); | ||
1822 | + return 0; | ||
1823 | +} | ||
1824 | + | ||
1825 | + | ||
1826 | +static int get_dir_index_using_offset(struct super_block *s, | ||
1827 | + long long *next_block, unsigned int *next_offset, | ||
1828 | + long long index_start, unsigned int index_offset, int i_count, | ||
1829 | + long long f_pos) | ||
1830 | +{ | ||
1831 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
1832 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1833 | + int i, length = 0; | ||
1834 | + struct squashfs_dir_index index; | ||
1835 | + | ||
1836 | + TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", | ||
1837 | + i_count, (unsigned int) f_pos); | ||
1838 | + | ||
1839 | + f_pos =- 3; | ||
1840 | + if (f_pos == 0) | ||
1841 | + goto finish; | ||
1842 | + | ||
1843 | + for (i = 0; i < i_count; i++) { | ||
1844 | + if (msblk->swap) { | ||
1845 | + struct squashfs_dir_index sindex; | ||
1846 | + squashfs_get_cached_block(s, &sindex, index_start, index_offset, | ||
1847 | + sizeof(sindex), &index_start, &index_offset); | ||
1848 | + SQUASHFS_SWAP_DIR_INDEX(&index, &sindex); | ||
1849 | + } else | ||
1850 | + squashfs_get_cached_block(s, &index, index_start, index_offset, | ||
1851 | + sizeof(index), &index_start, &index_offset); | ||
1852 | + | ||
1853 | + if (index.index > f_pos) | ||
1854 | + break; | ||
1855 | + | ||
1856 | + squashfs_get_cached_block(s, NULL, index_start, index_offset, | ||
1857 | + index.size + 1, &index_start, &index_offset); | ||
1858 | + | ||
1859 | + length = index.index; | ||
1860 | + *next_block = index.start_block + sblk->directory_table_start; | ||
1861 | + } | ||
1862 | + | ||
1863 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | ||
1864 | + | ||
1865 | +finish: | ||
1866 | + return length + 3; | ||
1867 | +} | ||
1868 | + | ||
1869 | + | ||
1870 | +static int get_dir_index_using_name(struct super_block *s, | ||
1871 | + long long *next_block, unsigned int *next_offset, | ||
1872 | + long long index_start, unsigned int index_offset, int i_count, | ||
1873 | + const char *name, int size) | ||
1874 | +{ | ||
1875 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
1876 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1877 | + int i, length = 0; | ||
1878 | + struct squashfs_dir_index *index; | ||
1879 | + char *str; | ||
1880 | + | ||
1881 | + TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count); | ||
1882 | + | ||
1883 | + str = kmalloc(sizeof(struct squashfs_dir_index) + | ||
1884 | + (SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL); | ||
1885 | + if (str == NULL) { | ||
1886 | + ERROR("Failed to allocate squashfs_dir_index\n"); | ||
1887 | + goto failure; | ||
1888 | + } | ||
1889 | + | ||
1890 | + index = (struct squashfs_dir_index *) (str + SQUASHFS_NAME_LEN + 1); | ||
1891 | + strncpy(str, name, size); | ||
1892 | + str[size] = '\0'; | ||
1893 | + | ||
1894 | + for (i = 0; i < i_count; i++) { | ||
1895 | + if (msblk->swap) { | ||
1896 | + struct squashfs_dir_index sindex; | ||
1897 | + squashfs_get_cached_block(s, &sindex, index_start, index_offset, | ||
1898 | + sizeof(sindex), &index_start, &index_offset); | ||
1899 | + SQUASHFS_SWAP_DIR_INDEX(index, &sindex); | ||
1900 | + } else | ||
1901 | + squashfs_get_cached_block(s, index, index_start, index_offset, | ||
1902 | + sizeof(struct squashfs_dir_index), &index_start, &index_offset); | ||
1903 | + | ||
1904 | + squashfs_get_cached_block(s, index->name, index_start, index_offset, | ||
1905 | + index->size + 1, &index_start, &index_offset); | ||
1906 | + | ||
1907 | + index->name[index->size + 1] = '\0'; | ||
1908 | + | ||
1909 | + if (strcmp(index->name, str) > 0) | ||
1910 | + break; | ||
1911 | + | ||
1912 | + length = index->index; | ||
1913 | + *next_block = index->start_block + sblk->directory_table_start; | ||
1914 | + } | ||
1915 | + | ||
1916 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | ||
1917 | + kfree(str); | ||
1918 | + | ||
1919 | +failure: | ||
1920 | + return length + 3; | ||
1921 | +} | ||
1922 | + | ||
1923 | + | ||
1924 | +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir) | ||
1925 | +{ | ||
1926 | + struct inode *i = file->f_dentry->d_inode; | ||
1927 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | ||
1928 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
1929 | + long long next_block = SQUASHFS_I(i)->start_block + | ||
1930 | + sblk->directory_table_start; | ||
1931 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, dir_count; | ||
1932 | + struct squashfs_dir_header dirh; | ||
1933 | + struct squashfs_dir_entry *dire; | ||
1934 | + | ||
1935 | + TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset); | ||
1936 | + | ||
1937 | + dire = kmalloc(sizeof(struct squashfs_dir_entry) + | ||
1938 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL); | ||
1939 | + if (dire == NULL) { | ||
1940 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | ||
1941 | + goto finish; | ||
1942 | + } | ||
1943 | + | ||
1944 | + while(file->f_pos < 3) { | ||
1945 | + char *name; | ||
1946 | + int size, i_ino; | ||
1947 | + | ||
1948 | + if(file->f_pos == 0) { | ||
1949 | + name = "."; | ||
1950 | + size = 1; | ||
1951 | + i_ino = i->i_ino; | ||
1952 | + } else { | ||
1953 | + name = ".."; | ||
1954 | + size = 2; | ||
1955 | + i_ino = SQUASHFS_I(i)->u.s2.parent_inode; | ||
1956 | + } | ||
1957 | + TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n", | ||
1958 | + (unsigned int) dirent, name, size, (int) | ||
1959 | + file->f_pos, i_ino, squashfs_filetype_table[1]); | ||
1960 | + | ||
1961 | + if (filldir(dirent, name, size, file->f_pos, i_ino, | ||
1962 | + squashfs_filetype_table[1]) < 0) { | ||
1963 | + TRACE("Filldir returned less than 0\n"); | ||
1964 | + goto finish; | ||
1965 | + } | ||
1966 | + file->f_pos += size; | ||
1967 | + } | ||
1968 | + | ||
1969 | + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, | ||
1970 | + SQUASHFS_I(i)->u.s2.directory_index_start, | ||
1971 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | ||
1972 | + SQUASHFS_I(i)->u.s2.directory_index_count, file->f_pos); | ||
1973 | + | ||
1974 | + while (length < i_size_read(i)) { | ||
1975 | + /* read directory header */ | ||
1976 | + if (msblk->swap) { | ||
1977 | + struct squashfs_dir_header sdirh; | ||
1978 | + | ||
1979 | + if (!squashfs_get_cached_block(i->i_sb, &sdirh, next_block, | ||
1980 | + next_offset, sizeof(sdirh), &next_block, &next_offset)) | ||
1981 | + goto failed_read; | ||
1982 | + | ||
1983 | + length += sizeof(sdirh); | ||
1984 | + SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh); | ||
1985 | + } else { | ||
1986 | + if (!squashfs_get_cached_block(i->i_sb, &dirh, next_block, | ||
1987 | + next_offset, sizeof(dirh), &next_block, &next_offset)) | ||
1988 | + goto failed_read; | ||
1989 | + | ||
1990 | + length += sizeof(dirh); | ||
1991 | + } | ||
1992 | + | ||
1993 | + dir_count = dirh.count + 1; | ||
1994 | + while (dir_count--) { | ||
1995 | + if (msblk->swap) { | ||
1996 | + struct squashfs_dir_entry sdire; | ||
1997 | + if (!squashfs_get_cached_block(i->i_sb, &sdire, next_block, | ||
1998 | + next_offset, sizeof(sdire), &next_block, &next_offset)) | ||
1999 | + goto failed_read; | ||
2000 | + | ||
2001 | + length += sizeof(sdire); | ||
2002 | + SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire); | ||
2003 | + } else { | ||
2004 | + if (!squashfs_get_cached_block(i->i_sb, dire, next_block, | ||
2005 | + next_offset, sizeof(*dire), &next_block, &next_offset)) | ||
2006 | + goto failed_read; | ||
2007 | + | ||
2008 | + length += sizeof(*dire); | ||
2009 | + } | ||
2010 | + | ||
2011 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, next_block, | ||
2012 | + next_offset, dire->size + 1, &next_block, &next_offset)) | ||
2013 | + goto failed_read; | ||
2014 | + | ||
2015 | + length += dire->size + 1; | ||
2016 | + | ||
2017 | + if (file->f_pos >= length) | ||
2018 | + continue; | ||
2019 | + | ||
2020 | + dire->name[dire->size + 1] = '\0'; | ||
2021 | + | ||
2022 | + TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n", | ||
2023 | + (unsigned int) dirent, dire->name, dire->size + 1, | ||
2024 | + (int) file->f_pos, dirh.start_block, dire->offset, | ||
2025 | + dirh.inode_number + dire->inode_number, | ||
2026 | + squashfs_filetype_table[dire->type]); | ||
2027 | + | ||
2028 | + if (filldir(dirent, dire->name, dire->size + 1, file->f_pos, | ||
2029 | + dirh.inode_number + dire->inode_number, | ||
2030 | + squashfs_filetype_table[dire->type]) < 0) { | ||
2031 | + TRACE("Filldir returned less than 0\n"); | ||
2032 | + goto finish; | ||
2033 | + } | ||
2034 | + file->f_pos = length; | ||
2035 | + } | ||
2036 | + } | ||
2037 | + | ||
2038 | +finish: | ||
2039 | + kfree(dire); | ||
2040 | + return 0; | ||
2041 | + | ||
2042 | +failed_read: | ||
2043 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | ||
2044 | + next_offset); | ||
2045 | + kfree(dire); | ||
2046 | + return 0; | ||
2047 | +} | ||
2048 | + | ||
2049 | + | ||
2050 | +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry, | ||
2051 | + struct nameidata *nd) | ||
2052 | +{ | ||
2053 | + const unsigned char *name = dentry->d_name.name; | ||
2054 | + int len = dentry->d_name.len; | ||
2055 | + struct inode *inode = NULL; | ||
2056 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | ||
2057 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2058 | + long long next_block = SQUASHFS_I(i)->start_block + | ||
2059 | + sblk->directory_table_start; | ||
2060 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, dir_count; | ||
2061 | + struct squashfs_dir_header dirh; | ||
2062 | + struct squashfs_dir_entry *dire; | ||
2063 | + | ||
2064 | + TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset); | ||
2065 | + | ||
2066 | + dire = kmalloc(sizeof(struct squashfs_dir_entry) + | ||
2067 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL); | ||
2068 | + if (dire == NULL) { | ||
2069 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | ||
2070 | + goto exit_lookup; | ||
2071 | + } | ||
2072 | + | ||
2073 | + if (len > SQUASHFS_NAME_LEN) | ||
2074 | + goto exit_lookup; | ||
2075 | + | ||
2076 | + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, | ||
2077 | + SQUASHFS_I(i)->u.s2.directory_index_start, | ||
2078 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | ||
2079 | + SQUASHFS_I(i)->u.s2.directory_index_count, name, len); | ||
2080 | + | ||
2081 | + while (length < i_size_read(i)) { | ||
2082 | + /* read directory header */ | ||
2083 | + if (msblk->swap) { | ||
2084 | + struct squashfs_dir_header sdirh; | ||
2085 | + if (!squashfs_get_cached_block(i->i_sb, &sdirh, next_block, | ||
2086 | + next_offset, sizeof(sdirh), &next_block, &next_offset)) | ||
2087 | + goto failed_read; | ||
2088 | + | ||
2089 | + length += sizeof(sdirh); | ||
2090 | + SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh); | ||
2091 | + } else { | ||
2092 | + if (!squashfs_get_cached_block(i->i_sb, &dirh, next_block, | ||
2093 | + next_offset, sizeof(dirh), &next_block, &next_offset)) | ||
2094 | + goto failed_read; | ||
2095 | + | ||
2096 | + length += sizeof(dirh); | ||
2097 | + } | ||
2098 | + | ||
2099 | + dir_count = dirh.count + 1; | ||
2100 | + while (dir_count--) { | ||
2101 | + if (msblk->swap) { | ||
2102 | + struct squashfs_dir_entry sdire; | ||
2103 | + if (!squashfs_get_cached_block(i->i_sb, &sdire, next_block, | ||
2104 | + next_offset, sizeof(sdire), &next_block, &next_offset)) | ||
2105 | + goto failed_read; | ||
2106 | + | ||
2107 | + length += sizeof(sdire); | ||
2108 | + SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire); | ||
2109 | + } else { | ||
2110 | + if (!squashfs_get_cached_block(i->i_sb, dire, next_block, | ||
2111 | + next_offset, sizeof(*dire), &next_block, &next_offset)) | ||
2112 | + goto failed_read; | ||
2113 | + | ||
2114 | + length += sizeof(*dire); | ||
2115 | + } | ||
2116 | + | ||
2117 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, next_block, | ||
2118 | + next_offset, dire->size + 1, &next_block, &next_offset)) | ||
2119 | + goto failed_read; | ||
2120 | + | ||
2121 | + length += dire->size + 1; | ||
2122 | + | ||
2123 | + if (name[0] < dire->name[0]) | ||
2124 | + goto exit_lookup; | ||
2125 | + | ||
2126 | + if ((len == dire->size + 1) && !strncmp(name, dire->name, len)) { | ||
2127 | + squashfs_inode_t ino = SQUASHFS_MKINODE(dirh.start_block, | ||
2128 | + dire->offset); | ||
2129 | + | ||
2130 | + TRACE("calling squashfs_iget for directory entry %s, inode" | ||
2131 | + " %x:%x, %d\n", name, dirh.start_block, dire->offset, | ||
2132 | + dirh.inode_number + dire->inode_number); | ||
2133 | + | ||
2134 | + inode = squashfs_iget(i->i_sb, ino, dirh.inode_number + dire->inode_number); | ||
2135 | + | ||
2136 | + goto exit_lookup; | ||
2137 | + } | ||
2138 | + } | ||
2139 | + } | ||
2140 | + | ||
2141 | +exit_lookup: | ||
2142 | + kfree(dire); | ||
2143 | + if (inode) | ||
2144 | + return d_splice_alias(inode, dentry); | ||
2145 | + d_add(dentry, inode); | ||
2146 | + return ERR_PTR(0); | ||
2147 | + | ||
2148 | +failed_read: | ||
2149 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | ||
2150 | + next_offset); | ||
2151 | + goto exit_lookup; | ||
2152 | +} | ||
2153 | + | ||
2154 | + | ||
2155 | +static int squashfs_remount(struct super_block *s, int *flags, char *data) | ||
2156 | +{ | ||
2157 | + *flags |= MS_RDONLY; | ||
2158 | + return 0; | ||
2159 | +} | ||
2160 | + | ||
2161 | + | ||
2162 | +static void squashfs_put_super(struct super_block *s) | ||
2163 | +{ | ||
2164 | + int i; | ||
2165 | + | ||
2166 | + if (s->s_fs_info) { | ||
2167 | + struct squashfs_sb_info *sbi = s->s_fs_info; | ||
2168 | + if (sbi->block_cache) | ||
2169 | + for (i = 0; i < squashfs_cached_blks; i++) | ||
2170 | + if (sbi->block_cache[i].block != SQUASHFS_INVALID_BLK) | ||
2171 | + vfree(sbi->block_cache[i].data); | ||
2172 | + if (sbi->fragment) | ||
2173 | + for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) | ||
2174 | + vfree(sbi->fragment[i].data); | ||
2175 | + kfree(sbi->fragment); | ||
2176 | + kfree(sbi->block_cache); | ||
2177 | + vfree(sbi->read_page); | ||
2178 | + kfree(sbi->uid); | ||
2179 | + kfree(sbi->fragment_index); | ||
2180 | + kfree(sbi->fragment_index_2); | ||
2181 | + kfree(sbi->meta_index); | ||
2182 | + vfree(sbi->stream.workspace); | ||
2183 | + kfree(s->s_fs_info); | ||
2184 | + s->s_fs_info = NULL; | ||
2185 | + } | ||
2186 | +} | ||
2187 | + | ||
2188 | + | ||
2189 | +static int squashfs_get_sb(struct file_system_type *fs_type, int flags, | ||
2190 | + const char *dev_name, void *data, struct vfsmount *mnt) | ||
2191 | +{ | ||
2192 | + return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super, | ||
2193 | + mnt); | ||
2194 | +} | ||
2195 | + | ||
2196 | + | ||
2197 | +static int __init init_squashfs_fs(void) | ||
2198 | +{ | ||
2199 | + int err = init_inodecache(); | ||
2200 | + if (err) | ||
2201 | + goto out; | ||
2202 | + | ||
2203 | + printk(KERN_INFO "squashfs: version 3.3 (2007/10/31) " | ||
2204 | + "Phillip Lougher\n"); | ||
2205 | + | ||
2206 | + err = register_filesystem(&squashfs_fs_type); | ||
2207 | + if (err) | ||
2208 | + destroy_inodecache(); | ||
2209 | + | ||
2210 | +out: | ||
2211 | + return err; | ||
2212 | +} | ||
2213 | + | ||
2214 | + | ||
2215 | +static void __exit exit_squashfs_fs(void) | ||
2216 | +{ | ||
2217 | + unregister_filesystem(&squashfs_fs_type); | ||
2218 | + destroy_inodecache(); | ||
2219 | +} | ||
2220 | + | ||
2221 | + | ||
2222 | +static struct kmem_cache * squashfs_inode_cachep; | ||
2223 | + | ||
2224 | + | ||
2225 | +static struct inode *squashfs_alloc_inode(struct super_block *sb) | ||
2226 | +{ | ||
2227 | + struct squashfs_inode_info *ei; | ||
2228 | + ei = kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL); | ||
2229 | + return ei ? &ei->vfs_inode : NULL; | ||
2230 | +} | ||
2231 | + | ||
2232 | + | ||
2233 | +static void squashfs_destroy_inode(struct inode *inode) | ||
2234 | +{ | ||
2235 | + kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode)); | ||
2236 | +} | ||
2237 | + | ||
2238 | + | ||
2239 | +static void init_once(struct kmem_cache *cachep, void *foo) | ||
2240 | +{ | ||
2241 | + struct squashfs_inode_info *ei = foo; | ||
2242 | + | ||
2243 | + inode_init_once(&ei->vfs_inode); | ||
2244 | +} | ||
2245 | + | ||
2246 | + | ||
2247 | +static int __init init_inodecache(void) | ||
2248 | +{ | ||
2249 | + squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", | ||
2250 | + sizeof(struct squashfs_inode_info), 0, | ||
2251 | + SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, init_once); | ||
2252 | + if (squashfs_inode_cachep == NULL) | ||
2253 | + return -ENOMEM; | ||
2254 | + return 0; | ||
2255 | +} | ||
2256 | + | ||
2257 | + | ||
2258 | +static void destroy_inodecache(void) | ||
2259 | +{ | ||
2260 | + kmem_cache_destroy(squashfs_inode_cachep); | ||
2261 | +} | ||
2262 | + | ||
2263 | + | ||
2264 | +module_init(init_squashfs_fs); | ||
2265 | +module_exit(exit_squashfs_fs); | ||
2266 | +MODULE_DESCRIPTION("squashfs 3.2-r2-CVS, a compressed read-only filesystem"); | ||
2267 | +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.demon.co.uk>"); | ||
2268 | +MODULE_LICENSE("GPL"); | ||
2269 | Index: linux-2.6.25-gentoo/fs/squashfs/Makefile | ||
2270 | =================================================================== | ||
2271 | --- /dev/null | ||
2272 | +++ linux-2.6.25-gentoo/fs/squashfs/Makefile | ||
2273 | @@ -0,0 +1,7 @@ | ||
2274 | +# | ||
2275 | +# Makefile for the linux squashfs routines. | ||
2276 | +# | ||
2277 | + | ||
2278 | +obj-$(CONFIG_SQUASHFS) += squashfs.o | ||
2279 | +squashfs-y += inode.o | ||
2280 | +squashfs-y += squashfs2_0.o | ||
2281 | Index: linux-2.6.25-gentoo/fs/squashfs/squashfs2_0.c | ||
2282 | =================================================================== | ||
2283 | --- /dev/null | ||
2284 | +++ linux-2.6.25-gentoo/fs/squashfs/squashfs2_0.c | ||
2285 | @@ -0,0 +1,740 @@ | ||
2286 | +/* | ||
2287 | + * Squashfs - a compressed read only filesystem for Linux | ||
2288 | + * | ||
2289 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007 | ||
2290 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
2291 | + * | ||
2292 | + * This program is free software; you can redistribute it and/or | ||
2293 | + * modify it under the terms of the GNU General Public License | ||
2294 | + * as published by the Free Software Foundation; either version 2, | ||
2295 | + * or (at your option) any later version. | ||
2296 | + * | ||
2297 | + * This program is distributed in the hope that it will be useful, | ||
2298 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
2299 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
2300 | + * GNU General Public License for more details. | ||
2301 | + * | ||
2302 | + * You should have received a copy of the GNU General Public License | ||
2303 | + * along with this program; if not, write to the Free Software | ||
2304 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
2305 | + * | ||
2306 | + * squashfs2_0.c | ||
2307 | + */ | ||
2308 | + | ||
2309 | +#include <linux/squashfs_fs.h> | ||
2310 | +#include <linux/module.h> | ||
2311 | +#include <linux/zlib.h> | ||
2312 | +#include <linux/fs.h> | ||
2313 | +#include <linux/squashfs_fs_sb.h> | ||
2314 | +#include <linux/squashfs_fs_i.h> | ||
2315 | + | ||
2316 | +#include "squashfs.h" | ||
2317 | +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir); | ||
2318 | +static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *, | ||
2319 | + struct nameidata *); | ||
2320 | + | ||
2321 | +static struct file_operations squashfs_dir_ops_2 = { | ||
2322 | + .read = generic_read_dir, | ||
2323 | + .readdir = squashfs_readdir_2 | ||
2324 | +}; | ||
2325 | + | ||
2326 | +static struct inode_operations squashfs_dir_inode_ops_2 = { | ||
2327 | + .lookup = squashfs_lookup_2 | ||
2328 | +}; | ||
2329 | + | ||
2330 | +static unsigned char squashfs_filetype_table[] = { | ||
2331 | + DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK | ||
2332 | +}; | ||
2333 | + | ||
2334 | +static int read_fragment_index_table_2(struct super_block *s) | ||
2335 | +{ | ||
2336 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
2337 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2338 | + | ||
2339 | + if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2 | ||
2340 | + (sblk->fragments), GFP_KERNEL))) { | ||
2341 | + ERROR("Failed to allocate uid/gid table\n"); | ||
2342 | + return 0; | ||
2343 | + } | ||
2344 | + | ||
2345 | + if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) && | ||
2346 | + !squashfs_read_data(s, (char *) | ||
2347 | + msblk->fragment_index_2, | ||
2348 | + sblk->fragment_table_start, | ||
2349 | + SQUASHFS_FRAGMENT_INDEX_BYTES_2 | ||
2350 | + (sblk->fragments) | | ||
2351 | + SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments))) { | ||
2352 | + ERROR("unable to read fragment index table\n"); | ||
2353 | + return 0; | ||
2354 | + } | ||
2355 | + | ||
2356 | + if (msblk->swap) { | ||
2357 | + int i; | ||
2358 | + unsigned int fragment; | ||
2359 | + | ||
2360 | + for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments); | ||
2361 | + i++) { | ||
2362 | + SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment), | ||
2363 | + &msblk->fragment_index_2[i], 1); | ||
2364 | + msblk->fragment_index_2[i] = fragment; | ||
2365 | + } | ||
2366 | + } | ||
2367 | + | ||
2368 | + return 1; | ||
2369 | +} | ||
2370 | + | ||
2371 | + | ||
2372 | +static int get_fragment_location_2(struct super_block *s, unsigned int fragment, | ||
2373 | + long long *fragment_start_block, | ||
2374 | + unsigned int *fragment_size) | ||
2375 | +{ | ||
2376 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
2377 | + long long start_block = | ||
2378 | + msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)]; | ||
2379 | + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment); | ||
2380 | + struct squashfs_fragment_entry_2 fragment_entry; | ||
2381 | + | ||
2382 | + if (msblk->swap) { | ||
2383 | + struct squashfs_fragment_entry_2 sfragment_entry; | ||
2384 | + | ||
2385 | + if (!squashfs_get_cached_block(s, (char *) &sfragment_entry, | ||
2386 | + start_block, offset, | ||
2387 | + sizeof(sfragment_entry), &start_block, | ||
2388 | + &offset)) | ||
2389 | + goto out; | ||
2390 | + SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry); | ||
2391 | + } else | ||
2392 | + if (!squashfs_get_cached_block(s, (char *) &fragment_entry, | ||
2393 | + start_block, offset, | ||
2394 | + sizeof(fragment_entry), &start_block, | ||
2395 | + &offset)) | ||
2396 | + goto out; | ||
2397 | + | ||
2398 | + *fragment_start_block = fragment_entry.start_block; | ||
2399 | + *fragment_size = fragment_entry.size; | ||
2400 | + | ||
2401 | + return 1; | ||
2402 | + | ||
2403 | +out: | ||
2404 | + return 0; | ||
2405 | +} | ||
2406 | + | ||
2407 | + | ||
2408 | +static void squashfs_new_inode(struct squashfs_sb_info *msblk, struct inode *i, | ||
2409 | + struct squashfs_base_inode_header_2 *inodeb, unsigned int ino) | ||
2410 | +{ | ||
2411 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2412 | + | ||
2413 | + i->i_ino = ino; | ||
2414 | + i->i_mtime.tv_sec = sblk->mkfs_time; | ||
2415 | + i->i_atime.tv_sec = sblk->mkfs_time; | ||
2416 | + i->i_ctime.tv_sec = sblk->mkfs_time; | ||
2417 | + i->i_uid = msblk->uid[inodeb->uid]; | ||
2418 | + i->i_mode = inodeb->mode; | ||
2419 | + i->i_nlink = 1; | ||
2420 | + i->i_size = 0; | ||
2421 | + if (inodeb->guid == SQUASHFS_GUIDS) | ||
2422 | + i->i_gid = i->i_uid; | ||
2423 | + else | ||
2424 | + i->i_gid = msblk->guid[inodeb->guid]; | ||
2425 | +} | ||
2426 | + | ||
2427 | + | ||
2428 | +static int squashfs_read_inode_2(struct inode *i, squashfs_inode_t inode) | ||
2429 | +{ | ||
2430 | + struct super_block *s = i->i_sb; | ||
2431 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
2432 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2433 | + unsigned int block = SQUASHFS_INODE_BLK(inode) + | ||
2434 | + sblk->inode_table_start; | ||
2435 | + unsigned int offset = SQUASHFS_INODE_OFFSET(inode); | ||
2436 | + unsigned int ino = SQUASHFS_MK_VFS_INODE(block - | ||
2437 | + sblk->inode_table_start, offset); | ||
2438 | + long long next_block; | ||
2439 | + unsigned int next_offset; | ||
2440 | + union squashfs_inode_header_2 id, sid; | ||
2441 | + struct squashfs_base_inode_header_2 *inodeb = &id.base, | ||
2442 | + *sinodeb = &sid.base; | ||
2443 | + | ||
2444 | + TRACE("Entered squashfs_read_inode_2\n"); | ||
2445 | + | ||
2446 | + if (msblk->swap) { | ||
2447 | + if (!squashfs_get_cached_block(s, (char *) sinodeb, block, | ||
2448 | + offset, sizeof(*sinodeb), &next_block, | ||
2449 | + &next_offset)) | ||
2450 | + goto failed_read; | ||
2451 | + SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb, | ||
2452 | + sizeof(*sinodeb)); | ||
2453 | + } else | ||
2454 | + if (!squashfs_get_cached_block(s, (char *) inodeb, block, | ||
2455 | + offset, sizeof(*inodeb), &next_block, | ||
2456 | + &next_offset)) | ||
2457 | + goto failed_read; | ||
2458 | + | ||
2459 | + squashfs_new_inode(msblk, i, inodeb, ino); | ||
2460 | + | ||
2461 | + switch(inodeb->inode_type) { | ||
2462 | + case SQUASHFS_FILE_TYPE: { | ||
2463 | + struct squashfs_reg_inode_header_2 *inodep = &id.reg; | ||
2464 | + struct squashfs_reg_inode_header_2 *sinodep = &sid.reg; | ||
2465 | + long long frag_blk; | ||
2466 | + unsigned int frag_size = 0; | ||
2467 | + | ||
2468 | + if (msblk->swap) { | ||
2469 | + if (!squashfs_get_cached_block(s, (char *) | ||
2470 | + sinodep, block, offset, | ||
2471 | + sizeof(*sinodep), &next_block, | ||
2472 | + &next_offset)) | ||
2473 | + goto failed_read; | ||
2474 | + SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep); | ||
2475 | + } else | ||
2476 | + if (!squashfs_get_cached_block(s, (char *) | ||
2477 | + inodep, block, offset, | ||
2478 | + sizeof(*inodep), &next_block, | ||
2479 | + &next_offset)) | ||
2480 | + goto failed_read; | ||
2481 | + | ||
2482 | + frag_blk = SQUASHFS_INVALID_BLK; | ||
2483 | + if (inodep->fragment != SQUASHFS_INVALID_FRAG && | ||
2484 | + !get_fragment_location_2(s, | ||
2485 | + inodep->fragment, &frag_blk, &frag_size)) | ||
2486 | + goto failed_read; | ||
2487 | + | ||
2488 | + i->i_size = inodep->file_size; | ||
2489 | + i->i_fop = &generic_ro_fops; | ||
2490 | + i->i_mode |= S_IFREG; | ||
2491 | + i->i_mtime.tv_sec = inodep->mtime; | ||
2492 | + i->i_atime.tv_sec = inodep->mtime; | ||
2493 | + i->i_ctime.tv_sec = inodep->mtime; | ||
2494 | + i->i_blocks = ((i->i_size - 1) >> 9) + 1; | ||
2495 | + SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk; | ||
2496 | + SQUASHFS_I(i)->u.s1.fragment_size = frag_size; | ||
2497 | + SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset; | ||
2498 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
2499 | + SQUASHFS_I(i)->u.s1.block_list_start = next_block; | ||
2500 | + SQUASHFS_I(i)->offset = next_offset; | ||
2501 | + i->i_data.a_ops = &squashfs_aops; | ||
2502 | + | ||
2503 | + TRACE("File inode %x:%x, start_block %x, " | ||
2504 | + "block_list_start %llx, offset %x\n", | ||
2505 | + SQUASHFS_INODE_BLK(inode), offset, | ||
2506 | + inodep->start_block, next_block, | ||
2507 | + next_offset); | ||
2508 | + break; | ||
2509 | + } | ||
2510 | + case SQUASHFS_DIR_TYPE: { | ||
2511 | + struct squashfs_dir_inode_header_2 *inodep = &id.dir; | ||
2512 | + struct squashfs_dir_inode_header_2 *sinodep = &sid.dir; | ||
2513 | + | ||
2514 | + if (msblk->swap) { | ||
2515 | + if (!squashfs_get_cached_block(s, (char *) | ||
2516 | + sinodep, block, offset, | ||
2517 | + sizeof(*sinodep), &next_block, | ||
2518 | + &next_offset)) | ||
2519 | + goto failed_read; | ||
2520 | + SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep); | ||
2521 | + } else | ||
2522 | + if (!squashfs_get_cached_block(s, (char *) | ||
2523 | + inodep, block, offset, | ||
2524 | + sizeof(*inodep), &next_block, | ||
2525 | + &next_offset)) | ||
2526 | + goto failed_read; | ||
2527 | + | ||
2528 | + i->i_size = inodep->file_size; | ||
2529 | + i->i_op = &squashfs_dir_inode_ops_2; | ||
2530 | + i->i_fop = &squashfs_dir_ops_2; | ||
2531 | + i->i_mode |= S_IFDIR; | ||
2532 | + i->i_mtime.tv_sec = inodep->mtime; | ||
2533 | + i->i_atime.tv_sec = inodep->mtime; | ||
2534 | + i->i_ctime.tv_sec = inodep->mtime; | ||
2535 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
2536 | + SQUASHFS_I(i)->offset = inodep->offset; | ||
2537 | + SQUASHFS_I(i)->u.s2.directory_index_count = 0; | ||
2538 | + SQUASHFS_I(i)->u.s2.parent_inode = 0; | ||
2539 | + | ||
2540 | + TRACE("Directory inode %x:%x, start_block %x, offset " | ||
2541 | + "%x\n", SQUASHFS_INODE_BLK(inode), | ||
2542 | + offset, inodep->start_block, | ||
2543 | + inodep->offset); | ||
2544 | + break; | ||
2545 | + } | ||
2546 | + case SQUASHFS_LDIR_TYPE: { | ||
2547 | + struct squashfs_ldir_inode_header_2 *inodep = &id.ldir; | ||
2548 | + struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir; | ||
2549 | + | ||
2550 | + if (msblk->swap) { | ||
2551 | + if (!squashfs_get_cached_block(s, (char *) | ||
2552 | + sinodep, block, offset, | ||
2553 | + sizeof(*sinodep), &next_block, | ||
2554 | + &next_offset)) | ||
2555 | + goto failed_read; | ||
2556 | + SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep, | ||
2557 | + sinodep); | ||
2558 | + } else | ||
2559 | + if (!squashfs_get_cached_block(s, (char *) | ||
2560 | + inodep, block, offset, | ||
2561 | + sizeof(*inodep), &next_block, | ||
2562 | + &next_offset)) | ||
2563 | + goto failed_read; | ||
2564 | + | ||
2565 | + i->i_size = inodep->file_size; | ||
2566 | + i->i_op = &squashfs_dir_inode_ops_2; | ||
2567 | + i->i_fop = &squashfs_dir_ops_2; | ||
2568 | + i->i_mode |= S_IFDIR; | ||
2569 | + i->i_mtime.tv_sec = inodep->mtime; | ||
2570 | + i->i_atime.tv_sec = inodep->mtime; | ||
2571 | + i->i_ctime.tv_sec = inodep->mtime; | ||
2572 | + SQUASHFS_I(i)->start_block = inodep->start_block; | ||
2573 | + SQUASHFS_I(i)->offset = inodep->offset; | ||
2574 | + SQUASHFS_I(i)->u.s2.directory_index_start = next_block; | ||
2575 | + SQUASHFS_I(i)->u.s2.directory_index_offset = | ||
2576 | + next_offset; | ||
2577 | + SQUASHFS_I(i)->u.s2.directory_index_count = | ||
2578 | + inodep->i_count; | ||
2579 | + SQUASHFS_I(i)->u.s2.parent_inode = 0; | ||
2580 | + | ||
2581 | + TRACE("Long directory inode %x:%x, start_block %x, " | ||
2582 | + "offset %x\n", | ||
2583 | + SQUASHFS_INODE_BLK(inode), offset, | ||
2584 | + inodep->start_block, inodep->offset); | ||
2585 | + break; | ||
2586 | + } | ||
2587 | + case SQUASHFS_SYMLINK_TYPE: { | ||
2588 | + struct squashfs_symlink_inode_header_2 *inodep = | ||
2589 | + &id.symlink; | ||
2590 | + struct squashfs_symlink_inode_header_2 *sinodep = | ||
2591 | + &sid.symlink; | ||
2592 | + | ||
2593 | + if (msblk->swap) { | ||
2594 | + if (!squashfs_get_cached_block(s, (char *) | ||
2595 | + sinodep, block, offset, | ||
2596 | + sizeof(*sinodep), &next_block, | ||
2597 | + &next_offset)) | ||
2598 | + goto failed_read; | ||
2599 | + SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep, | ||
2600 | + sinodep); | ||
2601 | + } else | ||
2602 | + if (!squashfs_get_cached_block(s, (char *) | ||
2603 | + inodep, block, offset, | ||
2604 | + sizeof(*inodep), &next_block, | ||
2605 | + &next_offset)) | ||
2606 | + goto failed_read; | ||
2607 | + | ||
2608 | + i->i_size = inodep->symlink_size; | ||
2609 | + i->i_op = &page_symlink_inode_operations; | ||
2610 | + i->i_data.a_ops = &squashfs_symlink_aops; | ||
2611 | + i->i_mode |= S_IFLNK; | ||
2612 | + SQUASHFS_I(i)->start_block = next_block; | ||
2613 | + SQUASHFS_I(i)->offset = next_offset; | ||
2614 | + | ||
2615 | + TRACE("Symbolic link inode %x:%x, start_block %llx, " | ||
2616 | + "offset %x\n", | ||
2617 | + SQUASHFS_INODE_BLK(inode), offset, | ||
2618 | + next_block, next_offset); | ||
2619 | + break; | ||
2620 | + } | ||
2621 | + case SQUASHFS_BLKDEV_TYPE: | ||
2622 | + case SQUASHFS_CHRDEV_TYPE: { | ||
2623 | + struct squashfs_dev_inode_header_2 *inodep = &id.dev; | ||
2624 | + struct squashfs_dev_inode_header_2 *sinodep = &sid.dev; | ||
2625 | + | ||
2626 | + if (msblk->swap) { | ||
2627 | + if (!squashfs_get_cached_block(s, (char *) | ||
2628 | + sinodep, block, offset, | ||
2629 | + sizeof(*sinodep), &next_block, | ||
2630 | + &next_offset)) | ||
2631 | + goto failed_read; | ||
2632 | + SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep); | ||
2633 | + } else | ||
2634 | + if (!squashfs_get_cached_block(s, (char *) | ||
2635 | + inodep, block, offset, | ||
2636 | + sizeof(*inodep), &next_block, | ||
2637 | + &next_offset)) | ||
2638 | + goto failed_read; | ||
2639 | + | ||
2640 | + i->i_mode |= (inodeb->inode_type == | ||
2641 | + SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : | ||
2642 | + S_IFBLK; | ||
2643 | + init_special_inode(i, i->i_mode, | ||
2644 | + old_decode_dev(inodep->rdev)); | ||
2645 | + | ||
2646 | + TRACE("Device inode %x:%x, rdev %x\n", | ||
2647 | + SQUASHFS_INODE_BLK(inode), offset, | ||
2648 | + inodep->rdev); | ||
2649 | + break; | ||
2650 | + } | ||
2651 | + case SQUASHFS_FIFO_TYPE: | ||
2652 | + case SQUASHFS_SOCKET_TYPE: { | ||
2653 | + | ||
2654 | + i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE) | ||
2655 | + ? S_IFIFO : S_IFSOCK; | ||
2656 | + init_special_inode(i, i->i_mode, 0); | ||
2657 | + break; | ||
2658 | + } | ||
2659 | + default: | ||
2660 | + ERROR("Unknown inode type %d in squashfs_iget!\n", | ||
2661 | + inodeb->inode_type); | ||
2662 | + goto failed_read1; | ||
2663 | + } | ||
2664 | + | ||
2665 | + return 1; | ||
2666 | + | ||
2667 | +failed_read: | ||
2668 | + ERROR("Unable to read inode [%x:%x]\n", block, offset); | ||
2669 | + | ||
2670 | +failed_read1: | ||
2671 | + return 0; | ||
2672 | +} | ||
2673 | + | ||
2674 | + | ||
2675 | +static int get_dir_index_using_offset(struct super_block *s, long long | ||
2676 | + *next_block, unsigned int *next_offset, | ||
2677 | + long long index_start, | ||
2678 | + unsigned int index_offset, int i_count, | ||
2679 | + long long f_pos) | ||
2680 | +{ | ||
2681 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
2682 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2683 | + int i, length = 0; | ||
2684 | + struct squashfs_dir_index_2 index; | ||
2685 | + | ||
2686 | + TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", | ||
2687 | + i_count, (unsigned int) f_pos); | ||
2688 | + | ||
2689 | + if (f_pos == 0) | ||
2690 | + goto finish; | ||
2691 | + | ||
2692 | + for (i = 0; i < i_count; i++) { | ||
2693 | + if (msblk->swap) { | ||
2694 | + struct squashfs_dir_index_2 sindex; | ||
2695 | + squashfs_get_cached_block(s, (char *) &sindex, | ||
2696 | + index_start, index_offset, | ||
2697 | + sizeof(sindex), &index_start, | ||
2698 | + &index_offset); | ||
2699 | + SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex); | ||
2700 | + } else | ||
2701 | + squashfs_get_cached_block(s, (char *) &index, | ||
2702 | + index_start, index_offset, | ||
2703 | + sizeof(index), &index_start, | ||
2704 | + &index_offset); | ||
2705 | + | ||
2706 | + if (index.index > f_pos) | ||
2707 | + break; | ||
2708 | + | ||
2709 | + squashfs_get_cached_block(s, NULL, index_start, index_offset, | ||
2710 | + index.size + 1, &index_start, | ||
2711 | + &index_offset); | ||
2712 | + | ||
2713 | + length = index.index; | ||
2714 | + *next_block = index.start_block + sblk->directory_table_start; | ||
2715 | + } | ||
2716 | + | ||
2717 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | ||
2718 | + | ||
2719 | +finish: | ||
2720 | + return length; | ||
2721 | +} | ||
2722 | + | ||
2723 | + | ||
2724 | +static int get_dir_index_using_name(struct super_block *s, long long | ||
2725 | + *next_block, unsigned int *next_offset, | ||
2726 | + long long index_start, | ||
2727 | + unsigned int index_offset, int i_count, | ||
2728 | + const char *name, int size) | ||
2729 | +{ | ||
2730 | + struct squashfs_sb_info *msblk = s->s_fs_info; | ||
2731 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2732 | + int i, length = 0; | ||
2733 | + struct squashfs_dir_index_2 *index; | ||
2734 | + char *str; | ||
2735 | + | ||
2736 | + TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count); | ||
2737 | + | ||
2738 | + if (!(str = kmalloc(sizeof(struct squashfs_dir_index) + | ||
2739 | + (SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL))) { | ||
2740 | + ERROR("Failed to allocate squashfs_dir_index\n"); | ||
2741 | + goto failure; | ||
2742 | + } | ||
2743 | + | ||
2744 | + index = (struct squashfs_dir_index_2 *) (str + SQUASHFS_NAME_LEN + 1); | ||
2745 | + strncpy(str, name, size); | ||
2746 | + str[size] = '\0'; | ||
2747 | + | ||
2748 | + for (i = 0; i < i_count; i++) { | ||
2749 | + if (msblk->swap) { | ||
2750 | + struct squashfs_dir_index_2 sindex; | ||
2751 | + squashfs_get_cached_block(s, (char *) &sindex, | ||
2752 | + index_start, index_offset, | ||
2753 | + sizeof(sindex), &index_start, | ||
2754 | + &index_offset); | ||
2755 | + SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex); | ||
2756 | + } else | ||
2757 | + squashfs_get_cached_block(s, (char *) index, | ||
2758 | + index_start, index_offset, | ||
2759 | + sizeof(struct squashfs_dir_index_2), | ||
2760 | + &index_start, &index_offset); | ||
2761 | + | ||
2762 | + squashfs_get_cached_block(s, index->name, index_start, | ||
2763 | + index_offset, index->size + 1, | ||
2764 | + &index_start, &index_offset); | ||
2765 | + | ||
2766 | + index->name[index->size + 1] = '\0'; | ||
2767 | + | ||
2768 | + if (strcmp(index->name, str) > 0) | ||
2769 | + break; | ||
2770 | + | ||
2771 | + length = index->index; | ||
2772 | + *next_block = index->start_block + sblk->directory_table_start; | ||
2773 | + } | ||
2774 | + | ||
2775 | + *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; | ||
2776 | + kfree(str); | ||
2777 | +failure: | ||
2778 | + return length; | ||
2779 | +} | ||
2780 | + | ||
2781 | + | ||
2782 | +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir) | ||
2783 | +{ | ||
2784 | + struct inode *i = file->f_dentry->d_inode; | ||
2785 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | ||
2786 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2787 | + long long next_block = SQUASHFS_I(i)->start_block + | ||
2788 | + sblk->directory_table_start; | ||
2789 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, | ||
2790 | + dir_count; | ||
2791 | + struct squashfs_dir_header_2 dirh; | ||
2792 | + struct squashfs_dir_entry_2 *dire; | ||
2793 | + | ||
2794 | + TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset); | ||
2795 | + | ||
2796 | + if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) + | ||
2797 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) { | ||
2798 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | ||
2799 | + goto finish; | ||
2800 | + } | ||
2801 | + | ||
2802 | + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, | ||
2803 | + SQUASHFS_I(i)->u.s2.directory_index_start, | ||
2804 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | ||
2805 | + SQUASHFS_I(i)->u.s2.directory_index_count, | ||
2806 | + file->f_pos); | ||
2807 | + | ||
2808 | + while (length < i_size_read(i)) { | ||
2809 | + /* read directory header */ | ||
2810 | + if (msblk->swap) { | ||
2811 | + struct squashfs_dir_header_2 sdirh; | ||
2812 | + | ||
2813 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, | ||
2814 | + next_block, next_offset, sizeof(sdirh), | ||
2815 | + &next_block, &next_offset)) | ||
2816 | + goto failed_read; | ||
2817 | + | ||
2818 | + length += sizeof(sdirh); | ||
2819 | + SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh); | ||
2820 | + } else { | ||
2821 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, | ||
2822 | + next_block, next_offset, sizeof(dirh), | ||
2823 | + &next_block, &next_offset)) | ||
2824 | + goto failed_read; | ||
2825 | + | ||
2826 | + length += sizeof(dirh); | ||
2827 | + } | ||
2828 | + | ||
2829 | + dir_count = dirh.count + 1; | ||
2830 | + while (dir_count--) { | ||
2831 | + if (msblk->swap) { | ||
2832 | + struct squashfs_dir_entry_2 sdire; | ||
2833 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | ||
2834 | + &sdire, next_block, next_offset, | ||
2835 | + sizeof(sdire), &next_block, | ||
2836 | + &next_offset)) | ||
2837 | + goto failed_read; | ||
2838 | + | ||
2839 | + length += sizeof(sdire); | ||
2840 | + SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire); | ||
2841 | + } else { | ||
2842 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | ||
2843 | + dire, next_block, next_offset, | ||
2844 | + sizeof(*dire), &next_block, | ||
2845 | + &next_offset)) | ||
2846 | + goto failed_read; | ||
2847 | + | ||
2848 | + length += sizeof(*dire); | ||
2849 | + } | ||
2850 | + | ||
2851 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, | ||
2852 | + next_block, next_offset, | ||
2853 | + dire->size + 1, &next_block, | ||
2854 | + &next_offset)) | ||
2855 | + goto failed_read; | ||
2856 | + | ||
2857 | + length += dire->size + 1; | ||
2858 | + | ||
2859 | + if (file->f_pos >= length) | ||
2860 | + continue; | ||
2861 | + | ||
2862 | + dire->name[dire->size + 1] = '\0'; | ||
2863 | + | ||
2864 | + TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n", | ||
2865 | + (unsigned int) dirent, dire->name, | ||
2866 | + dire->size + 1, (int) file->f_pos, | ||
2867 | + dirh.start_block, dire->offset, | ||
2868 | + squashfs_filetype_table[dire->type]); | ||
2869 | + | ||
2870 | + if (filldir(dirent, dire->name, dire->size + 1, | ||
2871 | + file->f_pos, SQUASHFS_MK_VFS_INODE( | ||
2872 | + dirh.start_block, dire->offset), | ||
2873 | + squashfs_filetype_table[dire->type]) | ||
2874 | + < 0) { | ||
2875 | + TRACE("Filldir returned less than 0\n"); | ||
2876 | + goto finish; | ||
2877 | + } | ||
2878 | + file->f_pos = length; | ||
2879 | + } | ||
2880 | + } | ||
2881 | + | ||
2882 | +finish: | ||
2883 | + kfree(dire); | ||
2884 | + return 0; | ||
2885 | + | ||
2886 | +failed_read: | ||
2887 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | ||
2888 | + next_offset); | ||
2889 | + kfree(dire); | ||
2890 | + return 0; | ||
2891 | +} | ||
2892 | + | ||
2893 | + | ||
2894 | +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry, | ||
2895 | + struct nameidata *nd) | ||
2896 | +{ | ||
2897 | + const unsigned char *name = dentry->d_name.name; | ||
2898 | + int len = dentry->d_name.len; | ||
2899 | + struct inode *inode = NULL; | ||
2900 | + struct squashfs_sb_info *msblk = i->i_sb->s_fs_info; | ||
2901 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
2902 | + long long next_block = SQUASHFS_I(i)->start_block + | ||
2903 | + sblk->directory_table_start; | ||
2904 | + int next_offset = SQUASHFS_I(i)->offset, length = 0, | ||
2905 | + dir_count; | ||
2906 | + struct squashfs_dir_header_2 dirh; | ||
2907 | + struct squashfs_dir_entry_2 *dire; | ||
2908 | + int sorted = sblk->s_major == 2 && sblk->s_minor >= 1; | ||
2909 | + | ||
2910 | + TRACE("Entered squashfs_lookup_2 [%llx:%x]\n", next_block, next_offset); | ||
2911 | + | ||
2912 | + if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) + | ||
2913 | + SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) { | ||
2914 | + ERROR("Failed to allocate squashfs_dir_entry\n"); | ||
2915 | + goto exit_loop; | ||
2916 | + } | ||
2917 | + | ||
2918 | + if (len > SQUASHFS_NAME_LEN) | ||
2919 | + goto exit_loop; | ||
2920 | + | ||
2921 | + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, | ||
2922 | + SQUASHFS_I(i)->u.s2.directory_index_start, | ||
2923 | + SQUASHFS_I(i)->u.s2.directory_index_offset, | ||
2924 | + SQUASHFS_I(i)->u.s2.directory_index_count, name, | ||
2925 | + len); | ||
2926 | + | ||
2927 | + while (length < i_size_read(i)) { | ||
2928 | + /* read directory header */ | ||
2929 | + if (msblk->swap) { | ||
2930 | + struct squashfs_dir_header_2 sdirh; | ||
2931 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, | ||
2932 | + next_block, next_offset, sizeof(sdirh), | ||
2933 | + &next_block, &next_offset)) | ||
2934 | + goto failed_read; | ||
2935 | + | ||
2936 | + length += sizeof(sdirh); | ||
2937 | + SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh); | ||
2938 | + } else { | ||
2939 | + if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh, | ||
2940 | + next_block, next_offset, sizeof(dirh), | ||
2941 | + &next_block, &next_offset)) | ||
2942 | + goto failed_read; | ||
2943 | + | ||
2944 | + length += sizeof(dirh); | ||
2945 | + } | ||
2946 | + | ||
2947 | + dir_count = dirh.count + 1; | ||
2948 | + while (dir_count--) { | ||
2949 | + if (msblk->swap) { | ||
2950 | + struct squashfs_dir_entry_2 sdire; | ||
2951 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | ||
2952 | + &sdire, next_block,next_offset, | ||
2953 | + sizeof(sdire), &next_block, | ||
2954 | + &next_offset)) | ||
2955 | + goto failed_read; | ||
2956 | + | ||
2957 | + length += sizeof(sdire); | ||
2958 | + SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire); | ||
2959 | + } else { | ||
2960 | + if (!squashfs_get_cached_block(i->i_sb, (char *) | ||
2961 | + dire, next_block,next_offset, | ||
2962 | + sizeof(*dire), &next_block, | ||
2963 | + &next_offset)) | ||
2964 | + goto failed_read; | ||
2965 | + | ||
2966 | + length += sizeof(*dire); | ||
2967 | + } | ||
2968 | + | ||
2969 | + if (!squashfs_get_cached_block(i->i_sb, dire->name, | ||
2970 | + next_block, next_offset, dire->size + 1, | ||
2971 | + &next_block, &next_offset)) | ||
2972 | + goto failed_read; | ||
2973 | + | ||
2974 | + length += dire->size + 1; | ||
2975 | + | ||
2976 | + if (sorted && name[0] < dire->name[0]) | ||
2977 | + goto exit_loop; | ||
2978 | + | ||
2979 | + if ((len == dire->size + 1) && !strncmp(name, | ||
2980 | + dire->name, len)) { | ||
2981 | + squashfs_inode_t ino = | ||
2982 | + SQUASHFS_MKINODE(dirh.start_block, | ||
2983 | + dire->offset); | ||
2984 | + unsigned int inode_number = SQUASHFS_MK_VFS_INODE(dirh.start_block, | ||
2985 | + dire->offset); | ||
2986 | + | ||
2987 | + TRACE("calling squashfs_iget for directory " | ||
2988 | + "entry %s, inode %x:%x, %lld\n", name, | ||
2989 | + dirh.start_block, dire->offset, ino); | ||
2990 | + | ||
2991 | + inode = squashfs_iget(i->i_sb, ino, inode_number); | ||
2992 | + | ||
2993 | + goto exit_loop; | ||
2994 | + } | ||
2995 | + } | ||
2996 | + } | ||
2997 | + | ||
2998 | +exit_loop: | ||
2999 | + kfree(dire); | ||
3000 | + d_add(dentry, inode); | ||
3001 | + return ERR_PTR(0); | ||
3002 | + | ||
3003 | +failed_read: | ||
3004 | + ERROR("Unable to read directory block [%llx:%x]\n", next_block, | ||
3005 | + next_offset); | ||
3006 | + goto exit_loop; | ||
3007 | +} | ||
3008 | + | ||
3009 | + | ||
3010 | +int squashfs_2_0_supported(struct squashfs_sb_info *msblk) | ||
3011 | +{ | ||
3012 | + struct squashfs_super_block *sblk = &msblk->sblk; | ||
3013 | + | ||
3014 | + msblk->read_inode = squashfs_read_inode_2; | ||
3015 | + msblk->read_fragment_index_table = read_fragment_index_table_2; | ||
3016 | + | ||
3017 | + sblk->bytes_used = sblk->bytes_used_2; | ||
3018 | + sblk->uid_start = sblk->uid_start_2; | ||
3019 | + sblk->guid_start = sblk->guid_start_2; | ||
3020 | + sblk->inode_table_start = sblk->inode_table_start_2; | ||
3021 | + sblk->directory_table_start = sblk->directory_table_start_2; | ||
3022 | + sblk->fragment_table_start = sblk->fragment_table_start_2; | ||
3023 | + | ||
3024 | + return 1; | ||
3025 | +} | ||
3026 | Index: linux-2.6.25-gentoo/fs/squashfs/squashfs.h | ||
3027 | =================================================================== | ||
3028 | --- /dev/null | ||
3029 | +++ linux-2.6.25-gentoo/fs/squashfs/squashfs.h | ||
3030 | @@ -0,0 +1,86 @@ | ||
3031 | +/* | ||
3032 | + * Squashfs - a compressed read only filesystem for Linux | ||
3033 | + * | ||
3034 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007 | ||
3035 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
3036 | + * | ||
3037 | + * This program is free software; you can redistribute it and/or | ||
3038 | + * modify it under the terms of the GNU General Public License | ||
3039 | + * as published by the Free Software Foundation; either version 2, | ||
3040 | + * or (at your option) any later version. | ||
3041 | + * | ||
3042 | + * This program is distributed in the hope that it will be useful, | ||
3043 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
3044 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
3045 | + * GNU General Public License for more details. | ||
3046 | + * | ||
3047 | + * You should have received a copy of the GNU General Public License | ||
3048 | + * along with this program; if not, write to the Free Software | ||
3049 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
3050 | + * | ||
3051 | + * squashfs.h | ||
3052 | + */ | ||
3053 | + | ||
3054 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY | ||
3055 | +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY | ||
3056 | +#endif | ||
3057 | + | ||
3058 | +#ifdef SQUASHFS_TRACE | ||
3059 | +#define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS: "s, ## args) | ||
3060 | +#else | ||
3061 | +#define TRACE(s, args...) {} | ||
3062 | +#endif | ||
3063 | + | ||
3064 | +#define ERROR(s, args...) printk(KERN_ERR "SQUASHFS error: "s, ## args) | ||
3065 | + | ||
3066 | +#define SERROR(s, args...) do { \ | ||
3067 | + if (!silent) \ | ||
3068 | + printk(KERN_ERR "SQUASHFS error: "s, ## args);\ | ||
3069 | + } while(0) | ||
3070 | + | ||
3071 | +#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args) | ||
3072 | + | ||
3073 | +static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode) | ||
3074 | +{ | ||
3075 | + return list_entry(inode, struct squashfs_inode_info, vfs_inode); | ||
3076 | +} | ||
3077 | + | ||
3078 | +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY) | ||
3079 | +#define SQSH_EXTERN | ||
3080 | +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer, | ||
3081 | + long long index, unsigned int length, | ||
3082 | + long long *next_index, int srclength); | ||
3083 | +extern int squashfs_get_cached_block(struct super_block *s, void *buffer, | ||
3084 | + long long block, unsigned int offset, | ||
3085 | + int length, long long *next_block, | ||
3086 | + unsigned int *next_offset); | ||
3087 | +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct | ||
3088 | + squashfs_fragment_cache *fragment); | ||
3089 | +extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block | ||
3090 | + *s, long long start_block, | ||
3091 | + int length); | ||
3092 | +extern struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode, unsigned int inode_number); | ||
3093 | +extern const struct address_space_operations squashfs_symlink_aops; | ||
3094 | +extern const struct address_space_operations squashfs_aops; | ||
3095 | +extern struct inode_operations squashfs_dir_inode_ops; | ||
3096 | +#else | ||
3097 | +#define SQSH_EXTERN static | ||
3098 | +#endif | ||
3099 | + | ||
3100 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY | ||
3101 | +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk); | ||
3102 | +#else | ||
3103 | +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk) | ||
3104 | +{ | ||
3105 | + return 0; | ||
3106 | +} | ||
3107 | +#endif | ||
3108 | + | ||
3109 | +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY | ||
3110 | +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk); | ||
3111 | +#else | ||
3112 | +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk) | ||
3113 | +{ | ||
3114 | + return 0; | ||
3115 | +} | ||
3116 | +#endif | ||
3117 | Index: linux-2.6.25-gentoo/include/linux/squashfs_fs.h | ||
3118 | =================================================================== | ||
3119 | --- /dev/null | ||
3120 | +++ linux-2.6.25-gentoo/include/linux/squashfs_fs.h | ||
3121 | @@ -0,0 +1,935 @@ | ||
3122 | +#ifndef SQUASHFS_FS | ||
3123 | +#define SQUASHFS_FS | ||
3124 | + | ||
3125 | +/* | ||
3126 | + * Squashfs | ||
3127 | + * | ||
3128 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007 | ||
3129 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
3130 | + * | ||
3131 | + * This program is free software; you can redistribute it and/or | ||
3132 | + * modify it under the terms of the GNU General Public License | ||
3133 | + * as published by the Free Software Foundation; either version 2, | ||
3134 | + * or (at your option) any later version. | ||
3135 | + * | ||
3136 | + * This program is distributed in the hope that it will be useful, | ||
3137 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
3138 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
3139 | + * GNU General Public License for more details. | ||
3140 | + * | ||
3141 | + * You should have received a copy of the GNU General Public License | ||
3142 | + * along with this program; if not, write to the Free Software | ||
3143 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
3144 | + * | ||
3145 | + * squashfs_fs.h | ||
3146 | + */ | ||
3147 | + | ||
3148 | +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY | ||
3149 | +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY | ||
3150 | +#endif | ||
3151 | + | ||
3152 | +#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE | ||
3153 | +#define SQUASHFS_MAJOR 3 | ||
3154 | +#define SQUASHFS_MINOR 1 | ||
3155 | +#define SQUASHFS_MAGIC 0x73717368 | ||
3156 | +#define SQUASHFS_MAGIC_SWAP 0x68737173 | ||
3157 | +#define SQUASHFS_START 0 | ||
3158 | + | ||
3159 | +/* size of metadata (inode and directory) blocks */ | ||
3160 | +#define SQUASHFS_METADATA_SIZE 8192 | ||
3161 | +#define SQUASHFS_METADATA_LOG 13 | ||
3162 | + | ||
3163 | +/* default size of data blocks */ | ||
3164 | +#define SQUASHFS_FILE_SIZE 131072 | ||
3165 | +#define SQUASHFS_FILE_LOG 17 | ||
3166 | + | ||
3167 | +#define SQUASHFS_FILE_MAX_SIZE 1048576 | ||
3168 | + | ||
3169 | +/* Max number of uids and gids */ | ||
3170 | +#define SQUASHFS_UIDS 256 | ||
3171 | +#define SQUASHFS_GUIDS 255 | ||
3172 | + | ||
3173 | +/* Max length of filename (not 255) */ | ||
3174 | +#define SQUASHFS_NAME_LEN 256 | ||
3175 | + | ||
3176 | +#define SQUASHFS_INVALID ((long long) 0xffffffffffff) | ||
3177 | +#define SQUASHFS_INVALID_FRAG ((unsigned int) 0xffffffff) | ||
3178 | +#define SQUASHFS_INVALID_BLK ((long long) -1) | ||
3179 | +#define SQUASHFS_USED_BLK ((long long) -2) | ||
3180 | + | ||
3181 | +/* Filesystem flags */ | ||
3182 | +#define SQUASHFS_NOI 0 | ||
3183 | +#define SQUASHFS_NOD 1 | ||
3184 | +#define SQUASHFS_CHECK 2 | ||
3185 | +#define SQUASHFS_NOF 3 | ||
3186 | +#define SQUASHFS_NO_FRAG 4 | ||
3187 | +#define SQUASHFS_ALWAYS_FRAG 5 | ||
3188 | +#define SQUASHFS_DUPLICATE 6 | ||
3189 | +#define SQUASHFS_EXPORT 7 | ||
3190 | + | ||
3191 | +#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1) | ||
3192 | + | ||
3193 | +#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \ | ||
3194 | + SQUASHFS_NOI) | ||
3195 | + | ||
3196 | +#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \ | ||
3197 | + SQUASHFS_NOD) | ||
3198 | + | ||
3199 | +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ | ||
3200 | + SQUASHFS_NOF) | ||
3201 | + | ||
3202 | +#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ | ||
3203 | + SQUASHFS_NO_FRAG) | ||
3204 | + | ||
3205 | +#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ | ||
3206 | + SQUASHFS_ALWAYS_FRAG) | ||
3207 | + | ||
3208 | +#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \ | ||
3209 | + SQUASHFS_DUPLICATE) | ||
3210 | + | ||
3211 | +#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \ | ||
3212 | + SQUASHFS_EXPORT) | ||
3213 | + | ||
3214 | +#define SQUASHFS_CHECK_DATA(flags) SQUASHFS_BIT(flags, \ | ||
3215 | + SQUASHFS_CHECK) | ||
3216 | + | ||
3217 | +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \ | ||
3218 | + duplicate_checking, exortable) (noi | (nod << 1) | (check_data << 2) \ | ||
3219 | + | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \ | ||
3220 | + (duplicate_checking << 6) | (exportable << 7)) | ||
3221 | + | ||
3222 | +/* Max number of types and file types */ | ||
3223 | +#define SQUASHFS_DIR_TYPE 1 | ||
3224 | +#define SQUASHFS_FILE_TYPE 2 | ||
3225 | +#define SQUASHFS_SYMLINK_TYPE 3 | ||
3226 | +#define SQUASHFS_BLKDEV_TYPE 4 | ||
3227 | +#define SQUASHFS_CHRDEV_TYPE 5 | ||
3228 | +#define SQUASHFS_FIFO_TYPE 6 | ||
3229 | +#define SQUASHFS_SOCKET_TYPE 7 | ||
3230 | +#define SQUASHFS_LDIR_TYPE 8 | ||
3231 | +#define SQUASHFS_LREG_TYPE 9 | ||
3232 | + | ||
3233 | +/* 1.0 filesystem type definitions */ | ||
3234 | +#define SQUASHFS_TYPES 5 | ||
3235 | +#define SQUASHFS_IPC_TYPE 0 | ||
3236 | + | ||
3237 | +/* Flag whether block is compressed or uncompressed, bit is set if block is | ||
3238 | + * uncompressed */ | ||
3239 | +#define SQUASHFS_COMPRESSED_BIT (1 << 15) | ||
3240 | + | ||
3241 | +#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \ | ||
3242 | + (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT) | ||
3243 | + | ||
3244 | +#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT)) | ||
3245 | + | ||
3246 | +#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24) | ||
3247 | + | ||
3248 | +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \ | ||
3249 | + ~SQUASHFS_COMPRESSED_BIT_BLOCK) | ||
3250 | + | ||
3251 | +#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK)) | ||
3252 | + | ||
3253 | +/* | ||
3254 | + * Inode number ops. Inodes consist of a compressed block number, and an | ||
3255 | + * uncompressed offset within that block | ||
3256 | + */ | ||
3257 | +#define SQUASHFS_INODE_BLK(a) ((unsigned int) ((a) >> 16)) | ||
3258 | + | ||
3259 | +#define SQUASHFS_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff)) | ||
3260 | + | ||
3261 | +#define SQUASHFS_MKINODE(A, B) ((squashfs_inode_t)(((squashfs_inode_t) (A)\ | ||
3262 | + << 16) + (B))) | ||
3263 | + | ||
3264 | +/* Compute 32 bit VFS inode number from squashfs inode number */ | ||
3265 | +#define SQUASHFS_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \ | ||
3266 | + ((b) >> 2) + 1)) | ||
3267 | +/* XXX */ | ||
3268 | + | ||
3269 | +/* Translate between VFS mode and squashfs mode */ | ||
3270 | +#define SQUASHFS_MODE(a) ((a) & 0xfff) | ||
3271 | + | ||
3272 | +/* fragment and fragment table defines */ | ||
3273 | +#define SQUASHFS_FRAGMENT_BYTES(A) ((A) * sizeof(struct squashfs_fragment_entry)) | ||
3274 | + | ||
3275 | +#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \ | ||
3276 | + SQUASHFS_METADATA_SIZE) | ||
3277 | + | ||
3278 | +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \ | ||
3279 | + SQUASHFS_METADATA_SIZE) | ||
3280 | + | ||
3281 | +#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \ | ||
3282 | + SQUASHFS_METADATA_SIZE - 1) / \ | ||
3283 | + SQUASHFS_METADATA_SIZE) | ||
3284 | + | ||
3285 | +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\ | ||
3286 | + sizeof(long long)) | ||
3287 | + | ||
3288 | +/* inode lookup table defines */ | ||
3289 | +#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(squashfs_inode_t)) | ||
3290 | + | ||
3291 | +#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \ | ||
3292 | + SQUASHFS_METADATA_SIZE) | ||
3293 | + | ||
3294 | +#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \ | ||
3295 | + SQUASHFS_METADATA_SIZE) | ||
3296 | + | ||
3297 | +#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \ | ||
3298 | + SQUASHFS_METADATA_SIZE - 1) / \ | ||
3299 | + SQUASHFS_METADATA_SIZE) | ||
3300 | + | ||
3301 | +#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\ | ||
3302 | + sizeof(long long)) | ||
3303 | + | ||
3304 | +/* cached data constants for filesystem */ | ||
3305 | +#define SQUASHFS_CACHED_BLKS 8 | ||
3306 | + | ||
3307 | +#define SQUASHFS_MAX_FILE_SIZE_LOG 64 | ||
3308 | + | ||
3309 | +#define SQUASHFS_MAX_FILE_SIZE ((long long) 1 << \ | ||
3310 | + (SQUASHFS_MAX_FILE_SIZE_LOG - 2)) | ||
3311 | + | ||
3312 | +#define SQUASHFS_MARKER_BYTE 0xff | ||
3313 | + | ||
3314 | +/* meta index cache */ | ||
3315 | +#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int)) | ||
3316 | +#define SQUASHFS_META_ENTRIES 31 | ||
3317 | +#define SQUASHFS_META_NUMBER 8 | ||
3318 | +#define SQUASHFS_SLOTS 4 | ||
3319 | + | ||
3320 | +struct meta_entry { | ||
3321 | + long long data_block; | ||
3322 | + unsigned int index_block; | ||
3323 | + unsigned short offset; | ||
3324 | + unsigned short pad; | ||
3325 | +}; | ||
3326 | + | ||
3327 | +struct meta_index { | ||
3328 | + unsigned int inode_number; | ||
3329 | + unsigned int offset; | ||
3330 | + unsigned short entries; | ||
3331 | + unsigned short skip; | ||
3332 | + unsigned short locked; | ||
3333 | + unsigned short pad; | ||
3334 | + struct meta_entry meta_entry[SQUASHFS_META_ENTRIES]; | ||
3335 | +}; | ||
3336 | + | ||
3337 | + | ||
3338 | +/* | ||
3339 | + * definitions for structures on disk | ||
3340 | + */ | ||
3341 | + | ||
3342 | +typedef long long squashfs_block_t; | ||
3343 | +typedef long long squashfs_inode_t; | ||
3344 | + | ||
3345 | +struct squashfs_super_block { | ||
3346 | + unsigned int s_magic; | ||
3347 | + unsigned int inodes; | ||
3348 | + unsigned int bytes_used_2; | ||
3349 | + unsigned int uid_start_2; | ||
3350 | + unsigned int guid_start_2; | ||
3351 | + unsigned int inode_table_start_2; | ||
3352 | + unsigned int directory_table_start_2; | ||
3353 | + unsigned int s_major:16; | ||
3354 | + unsigned int s_minor:16; | ||
3355 | + unsigned int block_size_1:16; | ||
3356 | + unsigned int block_log:16; | ||
3357 | + unsigned int flags:8; | ||
3358 | + unsigned int no_uids:8; | ||
3359 | + unsigned int no_guids:8; | ||
3360 | + unsigned int mkfs_time /* time of filesystem creation */; | ||
3361 | + squashfs_inode_t root_inode; | ||
3362 | + unsigned int block_size; | ||
3363 | + unsigned int fragments; | ||
3364 | + unsigned int fragment_table_start_2; | ||
3365 | + long long bytes_used; | ||
3366 | + long long uid_start; | ||
3367 | + long long guid_start; | ||
3368 | + long long inode_table_start; | ||
3369 | + long long directory_table_start; | ||
3370 | + long long fragment_table_start; | ||
3371 | + long long lookup_table_start; | ||
3372 | +} __attribute__ ((packed)); | ||
3373 | + | ||
3374 | +struct squashfs_dir_index { | ||
3375 | + unsigned int index; | ||
3376 | + unsigned int start_block; | ||
3377 | + unsigned char size; | ||
3378 | + unsigned char name[0]; | ||
3379 | +} __attribute__ ((packed)); | ||
3380 | + | ||
3381 | +#define SQUASHFS_BASE_INODE_HEADER \ | ||
3382 | + unsigned int inode_type:4; \ | ||
3383 | + unsigned int mode:12; \ | ||
3384 | + unsigned int uid:8; \ | ||
3385 | + unsigned int guid:8; \ | ||
3386 | + unsigned int mtime; \ | ||
3387 | + unsigned int inode_number; | ||
3388 | + | ||
3389 | +struct squashfs_base_inode_header { | ||
3390 | + SQUASHFS_BASE_INODE_HEADER; | ||
3391 | +} __attribute__ ((packed)); | ||
3392 | + | ||
3393 | +struct squashfs_ipc_inode_header { | ||
3394 | + SQUASHFS_BASE_INODE_HEADER; | ||
3395 | + unsigned int nlink; | ||
3396 | +} __attribute__ ((packed)); | ||
3397 | + | ||
3398 | +struct squashfs_dev_inode_header { | ||
3399 | + SQUASHFS_BASE_INODE_HEADER; | ||
3400 | + unsigned int nlink; | ||
3401 | + unsigned short rdev; | ||
3402 | +} __attribute__ ((packed)); | ||
3403 | + | ||
3404 | +struct squashfs_symlink_inode_header { | ||
3405 | + SQUASHFS_BASE_INODE_HEADER; | ||
3406 | + unsigned int nlink; | ||
3407 | + unsigned short symlink_size; | ||
3408 | + char symlink[0]; | ||
3409 | +} __attribute__ ((packed)); | ||
3410 | + | ||
3411 | +struct squashfs_reg_inode_header { | ||
3412 | + SQUASHFS_BASE_INODE_HEADER; | ||
3413 | + squashfs_block_t start_block; | ||
3414 | + unsigned int fragment; | ||
3415 | + unsigned int offset; | ||
3416 | + unsigned int file_size; | ||
3417 | + unsigned short block_list[0]; | ||
3418 | +} __attribute__ ((packed)); | ||
3419 | + | ||
3420 | +struct squashfs_lreg_inode_header { | ||
3421 | + SQUASHFS_BASE_INODE_HEADER; | ||
3422 | + unsigned int nlink; | ||
3423 | + squashfs_block_t start_block; | ||
3424 | + unsigned int fragment; | ||
3425 | + unsigned int offset; | ||
3426 | + long long file_size; | ||
3427 | + unsigned short block_list[0]; | ||
3428 | +} __attribute__ ((packed)); | ||
3429 | + | ||
3430 | +struct squashfs_dir_inode_header { | ||
3431 | + SQUASHFS_BASE_INODE_HEADER; | ||
3432 | + unsigned int nlink; | ||
3433 | + unsigned int file_size:19; | ||
3434 | + unsigned int offset:13; | ||
3435 | + unsigned int start_block; | ||
3436 | + unsigned int parent_inode; | ||
3437 | +} __attribute__ ((packed)); | ||
3438 | + | ||
3439 | +struct squashfs_ldir_inode_header { | ||
3440 | + SQUASHFS_BASE_INODE_HEADER; | ||
3441 | + unsigned int nlink; | ||
3442 | + unsigned int file_size:27; | ||
3443 | + unsigned int offset:13; | ||
3444 | + unsigned int start_block; | ||
3445 | + unsigned int i_count:16; | ||
3446 | + unsigned int parent_inode; | ||
3447 | + struct squashfs_dir_index index[0]; | ||
3448 | +} __attribute__ ((packed)); | ||
3449 | + | ||
3450 | +union squashfs_inode_header { | ||
3451 | + struct squashfs_base_inode_header base; | ||
3452 | + struct squashfs_dev_inode_header dev; | ||
3453 | + struct squashfs_symlink_inode_header symlink; | ||
3454 | + struct squashfs_reg_inode_header reg; | ||
3455 | + struct squashfs_lreg_inode_header lreg; | ||
3456 | + struct squashfs_dir_inode_header dir; | ||
3457 | + struct squashfs_ldir_inode_header ldir; | ||
3458 | + struct squashfs_ipc_inode_header ipc; | ||
3459 | +}; | ||
3460 | + | ||
3461 | +struct squashfs_dir_entry { | ||
3462 | + unsigned int offset:13; | ||
3463 | + unsigned int type:3; | ||
3464 | + unsigned int size:8; | ||
3465 | + int inode_number:16; | ||
3466 | + char name[0]; | ||
3467 | +} __attribute__ ((packed)); | ||
3468 | + | ||
3469 | +struct squashfs_dir_header { | ||
3470 | + unsigned int count:8; | ||
3471 | + unsigned int start_block; | ||
3472 | + unsigned int inode_number; | ||
3473 | +} __attribute__ ((packed)); | ||
3474 | + | ||
3475 | +struct squashfs_fragment_entry { | ||
3476 | + long long start_block; | ||
3477 | + unsigned int size; | ||
3478 | + unsigned int pending; | ||
3479 | +} __attribute__ ((packed)); | ||
3480 | + | ||
3481 | +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen); | ||
3482 | +extern int squashfs_uncompress_init(void); | ||
3483 | +extern int squashfs_uncompress_exit(void); | ||
3484 | + | ||
3485 | +/* | ||
3486 | + * macros to convert each packed bitfield structure from little endian to big | ||
3487 | + * endian and vice versa. These are needed when creating or using a filesystem | ||
3488 | + * on a machine with different byte ordering to the target architecture. | ||
3489 | + * | ||
3490 | + */ | ||
3491 | + | ||
3492 | +#define SQUASHFS_SWAP_START \ | ||
3493 | + int bits;\ | ||
3494 | + int b_pos;\ | ||
3495 | + unsigned long long val;\ | ||
3496 | + unsigned char *s;\ | ||
3497 | + unsigned char *d; | ||
3498 | + | ||
3499 | +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\ | ||
3500 | + SQUASHFS_SWAP_START\ | ||
3501 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\ | ||
3502 | + SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\ | ||
3503 | + SQUASHFS_SWAP((s)->inodes, d, 32, 32);\ | ||
3504 | + SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\ | ||
3505 | + SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\ | ||
3506 | + SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\ | ||
3507 | + SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\ | ||
3508 | + SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\ | ||
3509 | + SQUASHFS_SWAP((s)->s_major, d, 224, 16);\ | ||
3510 | + SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\ | ||
3511 | + SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\ | ||
3512 | + SQUASHFS_SWAP((s)->block_log, d, 272, 16);\ | ||
3513 | + SQUASHFS_SWAP((s)->flags, d, 288, 8);\ | ||
3514 | + SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\ | ||
3515 | + SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\ | ||
3516 | + SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\ | ||
3517 | + SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\ | ||
3518 | + SQUASHFS_SWAP((s)->block_size, d, 408, 32);\ | ||
3519 | + SQUASHFS_SWAP((s)->fragments, d, 440, 32);\ | ||
3520 | + SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\ | ||
3521 | + SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\ | ||
3522 | + SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\ | ||
3523 | + SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\ | ||
3524 | + SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\ | ||
3525 | + SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\ | ||
3526 | + SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\ | ||
3527 | + SQUASHFS_SWAP((s)->lookup_table_start, d, 888, 64);\ | ||
3528 | +} | ||
3529 | + | ||
3530 | +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\ | ||
3531 | + SQUASHFS_MEMSET(s, d, n);\ | ||
3532 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ | ||
3533 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ | ||
3534 | + SQUASHFS_SWAP((s)->uid, d, 16, 8);\ | ||
3535 | + SQUASHFS_SWAP((s)->guid, d, 24, 8);\ | ||
3536 | + SQUASHFS_SWAP((s)->mtime, d, 32, 32);\ | ||
3537 | + SQUASHFS_SWAP((s)->inode_number, d, 64, 32); | ||
3538 | + | ||
3539 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\ | ||
3540 | + SQUASHFS_SWAP_START\ | ||
3541 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\ | ||
3542 | +} | ||
3543 | + | ||
3544 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\ | ||
3545 | + SQUASHFS_SWAP_START\ | ||
3546 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3547 | + sizeof(struct squashfs_ipc_inode_header))\ | ||
3548 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | ||
3549 | +} | ||
3550 | + | ||
3551 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\ | ||
3552 | + SQUASHFS_SWAP_START\ | ||
3553 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3554 | + sizeof(struct squashfs_dev_inode_header)); \ | ||
3555 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | ||
3556 | + SQUASHFS_SWAP((s)->rdev, d, 128, 16);\ | ||
3557 | +} | ||
3558 | + | ||
3559 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\ | ||
3560 | + SQUASHFS_SWAP_START\ | ||
3561 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3562 | + sizeof(struct squashfs_symlink_inode_header));\ | ||
3563 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | ||
3564 | + SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\ | ||
3565 | +} | ||
3566 | + | ||
3567 | +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\ | ||
3568 | + SQUASHFS_SWAP_START\ | ||
3569 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3570 | + sizeof(struct squashfs_reg_inode_header));\ | ||
3571 | + SQUASHFS_SWAP((s)->start_block, d, 96, 64);\ | ||
3572 | + SQUASHFS_SWAP((s)->fragment, d, 160, 32);\ | ||
3573 | + SQUASHFS_SWAP((s)->offset, d, 192, 32);\ | ||
3574 | + SQUASHFS_SWAP((s)->file_size, d, 224, 32);\ | ||
3575 | +} | ||
3576 | + | ||
3577 | +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\ | ||
3578 | + SQUASHFS_SWAP_START\ | ||
3579 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3580 | + sizeof(struct squashfs_lreg_inode_header));\ | ||
3581 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | ||
3582 | + SQUASHFS_SWAP((s)->start_block, d, 128, 64);\ | ||
3583 | + SQUASHFS_SWAP((s)->fragment, d, 192, 32);\ | ||
3584 | + SQUASHFS_SWAP((s)->offset, d, 224, 32);\ | ||
3585 | + SQUASHFS_SWAP((s)->file_size, d, 256, 64);\ | ||
3586 | +} | ||
3587 | + | ||
3588 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\ | ||
3589 | + SQUASHFS_SWAP_START\ | ||
3590 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3591 | + sizeof(struct squashfs_dir_inode_header));\ | ||
3592 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | ||
3593 | + SQUASHFS_SWAP((s)->file_size, d, 128, 19);\ | ||
3594 | + SQUASHFS_SWAP((s)->offset, d, 147, 13);\ | ||
3595 | + SQUASHFS_SWAP((s)->start_block, d, 160, 32);\ | ||
3596 | + SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\ | ||
3597 | +} | ||
3598 | + | ||
3599 | +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\ | ||
3600 | + SQUASHFS_SWAP_START\ | ||
3601 | + SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \ | ||
3602 | + sizeof(struct squashfs_ldir_inode_header));\ | ||
3603 | + SQUASHFS_SWAP((s)->nlink, d, 96, 32);\ | ||
3604 | + SQUASHFS_SWAP((s)->file_size, d, 128, 27);\ | ||
3605 | + SQUASHFS_SWAP((s)->offset, d, 155, 13);\ | ||
3606 | + SQUASHFS_SWAP((s)->start_block, d, 168, 32);\ | ||
3607 | + SQUASHFS_SWAP((s)->i_count, d, 200, 16);\ | ||
3608 | + SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\ | ||
3609 | +} | ||
3610 | + | ||
3611 | +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\ | ||
3612 | + SQUASHFS_SWAP_START\ | ||
3613 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\ | ||
3614 | + SQUASHFS_SWAP((s)->index, d, 0, 32);\ | ||
3615 | + SQUASHFS_SWAP((s)->start_block, d, 32, 32);\ | ||
3616 | + SQUASHFS_SWAP((s)->size, d, 64, 8);\ | ||
3617 | +} | ||
3618 | + | ||
3619 | +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\ | ||
3620 | + SQUASHFS_SWAP_START\ | ||
3621 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\ | ||
3622 | + SQUASHFS_SWAP((s)->count, d, 0, 8);\ | ||
3623 | + SQUASHFS_SWAP((s)->start_block, d, 8, 32);\ | ||
3624 | + SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\ | ||
3625 | +} | ||
3626 | + | ||
3627 | +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\ | ||
3628 | + SQUASHFS_SWAP_START\ | ||
3629 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\ | ||
3630 | + SQUASHFS_SWAP((s)->offset, d, 0, 13);\ | ||
3631 | + SQUASHFS_SWAP((s)->type, d, 13, 3);\ | ||
3632 | + SQUASHFS_SWAP((s)->size, d, 16, 8);\ | ||
3633 | + SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\ | ||
3634 | +} | ||
3635 | + | ||
3636 | +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\ | ||
3637 | + SQUASHFS_SWAP_START\ | ||
3638 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\ | ||
3639 | + SQUASHFS_SWAP((s)->start_block, d, 0, 64);\ | ||
3640 | + SQUASHFS_SWAP((s)->size, d, 64, 32);\ | ||
3641 | +} | ||
3642 | + | ||
3643 | +#define SQUASHFS_SWAP_INODE_T(s, d) SQUASHFS_SWAP_LONG_LONGS(s, d, 1) | ||
3644 | + | ||
3645 | +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\ | ||
3646 | + int entry;\ | ||
3647 | + int bit_position;\ | ||
3648 | + SQUASHFS_SWAP_START\ | ||
3649 | + SQUASHFS_MEMSET(s, d, n * 2);\ | ||
3650 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | ||
3651 | + 16)\ | ||
3652 | + SQUASHFS_SWAP(s[entry], d, bit_position, 16);\ | ||
3653 | +} | ||
3654 | + | ||
3655 | +#define SQUASHFS_SWAP_INTS(s, d, n) {\ | ||
3656 | + int entry;\ | ||
3657 | + int bit_position;\ | ||
3658 | + SQUASHFS_SWAP_START\ | ||
3659 | + SQUASHFS_MEMSET(s, d, n * 4);\ | ||
3660 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | ||
3661 | + 32)\ | ||
3662 | + SQUASHFS_SWAP(s[entry], d, bit_position, 32);\ | ||
3663 | +} | ||
3664 | + | ||
3665 | +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\ | ||
3666 | + int entry;\ | ||
3667 | + int bit_position;\ | ||
3668 | + SQUASHFS_SWAP_START\ | ||
3669 | + SQUASHFS_MEMSET(s, d, n * 8);\ | ||
3670 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | ||
3671 | + 64)\ | ||
3672 | + SQUASHFS_SWAP(s[entry], d, bit_position, 64);\ | ||
3673 | +} | ||
3674 | + | ||
3675 | +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\ | ||
3676 | + int entry;\ | ||
3677 | + int bit_position;\ | ||
3678 | + SQUASHFS_SWAP_START\ | ||
3679 | + SQUASHFS_MEMSET(s, d, n * bits / 8);\ | ||
3680 | + for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \ | ||
3681 | + bits)\ | ||
3682 | + SQUASHFS_SWAP(s[entry], d, bit_position, bits);\ | ||
3683 | +} | ||
3684 | + | ||
3685 | +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n) | ||
3686 | +#define SQUASHFS_SWAP_LOOKUP_BLOCKS(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n) | ||
3687 | + | ||
3688 | +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY | ||
3689 | + | ||
3690 | +struct squashfs_base_inode_header_1 { | ||
3691 | + unsigned int inode_type:4; | ||
3692 | + unsigned int mode:12; /* protection */ | ||
3693 | + unsigned int uid:4; /* index into uid table */ | ||
3694 | + unsigned int guid:4; /* index into guid table */ | ||
3695 | +} __attribute__ ((packed)); | ||
3696 | + | ||
3697 | +struct squashfs_ipc_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 int type:4; | ||
3703 | + unsigned int offset:4; | ||
3704 | +} __attribute__ ((packed)); | ||
3705 | + | ||
3706 | +struct squashfs_dev_inode_header_1 { | ||
3707 | + unsigned int inode_type:4; | ||
3708 | + unsigned int mode:12; /* protection */ | ||
3709 | + unsigned int uid:4; /* index into uid table */ | ||
3710 | + unsigned int guid:4; /* index into guid table */ | ||
3711 | + unsigned short rdev; | ||
3712 | +} __attribute__ ((packed)); | ||
3713 | + | ||
3714 | +struct squashfs_symlink_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 short symlink_size; | ||
3720 | + char symlink[0]; | ||
3721 | +} __attribute__ ((packed)); | ||
3722 | + | ||
3723 | +struct squashfs_reg_inode_header_1 { | ||
3724 | + unsigned int inode_type:4; | ||
3725 | + unsigned int mode:12; /* protection */ | ||
3726 | + unsigned int uid:4; /* index into uid table */ | ||
3727 | + unsigned int guid:4; /* index into guid table */ | ||
3728 | + unsigned int mtime; | ||
3729 | + unsigned int start_block; | ||
3730 | + unsigned int file_size:32; | ||
3731 | + unsigned short block_list[0]; | ||
3732 | +} __attribute__ ((packed)); | ||
3733 | + | ||
3734 | +struct squashfs_dir_inode_header_1 { | ||
3735 | + unsigned int inode_type:4; | ||
3736 | + unsigned int mode:12; /* protection */ | ||
3737 | + unsigned int uid:4; /* index into uid table */ | ||
3738 | + unsigned int guid:4; /* index into guid table */ | ||
3739 | + unsigned int file_size:19; | ||
3740 | + unsigned int offset:13; | ||
3741 | + unsigned int mtime; | ||
3742 | + unsigned int start_block:24; | ||
3743 | +} __attribute__ ((packed)); | ||
3744 | + | ||
3745 | +union squashfs_inode_header_1 { | ||
3746 | + struct squashfs_base_inode_header_1 base; | ||
3747 | + struct squashfs_dev_inode_header_1 dev; | ||
3748 | + struct squashfs_symlink_inode_header_1 symlink; | ||
3749 | + struct squashfs_reg_inode_header_1 reg; | ||
3750 | + struct squashfs_dir_inode_header_1 dir; | ||
3751 | + struct squashfs_ipc_inode_header_1 ipc; | ||
3752 | +}; | ||
3753 | + | ||
3754 | +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \ | ||
3755 | + SQUASHFS_MEMSET(s, d, n);\ | ||
3756 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ | ||
3757 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ | ||
3758 | + SQUASHFS_SWAP((s)->uid, d, 16, 4);\ | ||
3759 | + SQUASHFS_SWAP((s)->guid, d, 20, 4); | ||
3760 | + | ||
3761 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\ | ||
3762 | + SQUASHFS_SWAP_START\ | ||
3763 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\ | ||
3764 | +} | ||
3765 | + | ||
3766 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\ | ||
3767 | + SQUASHFS_SWAP_START\ | ||
3768 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | ||
3769 | + sizeof(struct squashfs_ipc_inode_header_1));\ | ||
3770 | + SQUASHFS_SWAP((s)->type, d, 24, 4);\ | ||
3771 | + SQUASHFS_SWAP((s)->offset, d, 28, 4);\ | ||
3772 | +} | ||
3773 | + | ||
3774 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\ | ||
3775 | + SQUASHFS_SWAP_START\ | ||
3776 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | ||
3777 | + sizeof(struct squashfs_dev_inode_header_1));\ | ||
3778 | + SQUASHFS_SWAP((s)->rdev, d, 24, 16);\ | ||
3779 | +} | ||
3780 | + | ||
3781 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\ | ||
3782 | + SQUASHFS_SWAP_START\ | ||
3783 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | ||
3784 | + sizeof(struct squashfs_symlink_inode_header_1));\ | ||
3785 | + SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\ | ||
3786 | +} | ||
3787 | + | ||
3788 | +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\ | ||
3789 | + SQUASHFS_SWAP_START\ | ||
3790 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | ||
3791 | + sizeof(struct squashfs_reg_inode_header_1));\ | ||
3792 | + SQUASHFS_SWAP((s)->mtime, d, 24, 32);\ | ||
3793 | + SQUASHFS_SWAP((s)->start_block, d, 56, 32);\ | ||
3794 | + SQUASHFS_SWAP((s)->file_size, d, 88, 32);\ | ||
3795 | +} | ||
3796 | + | ||
3797 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\ | ||
3798 | + SQUASHFS_SWAP_START\ | ||
3799 | + SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \ | ||
3800 | + sizeof(struct squashfs_dir_inode_header_1));\ | ||
3801 | + SQUASHFS_SWAP((s)->file_size, d, 24, 19);\ | ||
3802 | + SQUASHFS_SWAP((s)->offset, d, 43, 13);\ | ||
3803 | + SQUASHFS_SWAP((s)->mtime, d, 56, 32);\ | ||
3804 | + SQUASHFS_SWAP((s)->start_block, d, 88, 24);\ | ||
3805 | +} | ||
3806 | + | ||
3807 | +#endif | ||
3808 | + | ||
3809 | +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY | ||
3810 | + | ||
3811 | +struct squashfs_dir_index_2 { | ||
3812 | + unsigned int index:27; | ||
3813 | + unsigned int start_block:29; | ||
3814 | + unsigned char size; | ||
3815 | + unsigned char name[0]; | ||
3816 | +} __attribute__ ((packed)); | ||
3817 | + | ||
3818 | +struct squashfs_base_inode_header_2 { | ||
3819 | + unsigned int inode_type:4; | ||
3820 | + unsigned int mode:12; /* protection */ | ||
3821 | + unsigned int uid:8; /* index into uid table */ | ||
3822 | + unsigned int guid:8; /* index into guid table */ | ||
3823 | +} __attribute__ ((packed)); | ||
3824 | + | ||
3825 | +struct squashfs_ipc_inode_header_2 { | ||
3826 | + unsigned int inode_type:4; | ||
3827 | + unsigned int mode:12; /* protection */ | ||
3828 | + unsigned int uid:8; /* index into uid table */ | ||
3829 | + unsigned int guid:8; /* index into guid table */ | ||
3830 | +} __attribute__ ((packed)); | ||
3831 | + | ||
3832 | +struct squashfs_dev_inode_header_2 { | ||
3833 | + unsigned int inode_type:4; | ||
3834 | + unsigned int mode:12; /* protection */ | ||
3835 | + unsigned int uid:8; /* index into uid table */ | ||
3836 | + unsigned int guid:8; /* index into guid table */ | ||
3837 | + unsigned short rdev; | ||
3838 | +} __attribute__ ((packed)); | ||
3839 | + | ||
3840 | +struct squashfs_symlink_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 short symlink_size; | ||
3846 | + char symlink[0]; | ||
3847 | +} __attribute__ ((packed)); | ||
3848 | + | ||
3849 | +struct squashfs_reg_inode_header_2 { | ||
3850 | + unsigned int inode_type:4; | ||
3851 | + unsigned int mode:12; /* protection */ | ||
3852 | + unsigned int uid:8; /* index into uid table */ | ||
3853 | + unsigned int guid:8; /* index into guid table */ | ||
3854 | + unsigned int mtime; | ||
3855 | + unsigned int start_block; | ||
3856 | + unsigned int fragment; | ||
3857 | + unsigned int offset; | ||
3858 | + unsigned int file_size:32; | ||
3859 | + unsigned short block_list[0]; | ||
3860 | +} __attribute__ ((packed)); | ||
3861 | + | ||
3862 | +struct squashfs_dir_inode_header_2 { | ||
3863 | + unsigned int inode_type:4; | ||
3864 | + unsigned int mode:12; /* protection */ | ||
3865 | + unsigned int uid:8; /* index into uid table */ | ||
3866 | + unsigned int guid:8; /* index into guid table */ | ||
3867 | + unsigned int file_size:19; | ||
3868 | + unsigned int offset:13; | ||
3869 | + unsigned int mtime; | ||
3870 | + unsigned int start_block:24; | ||
3871 | +} __attribute__ ((packed)); | ||
3872 | + | ||
3873 | +struct squashfs_ldir_inode_header_2 { | ||
3874 | + unsigned int inode_type:4; | ||
3875 | + unsigned int mode:12; /* protection */ | ||
3876 | + unsigned int uid:8; /* index into uid table */ | ||
3877 | + unsigned int guid:8; /* index into guid table */ | ||
3878 | + unsigned int file_size:27; | ||
3879 | + unsigned int offset:13; | ||
3880 | + unsigned int mtime; | ||
3881 | + unsigned int start_block:24; | ||
3882 | + unsigned int i_count:16; | ||
3883 | + struct squashfs_dir_index_2 index[0]; | ||
3884 | +} __attribute__ ((packed)); | ||
3885 | + | ||
3886 | +union squashfs_inode_header_2 { | ||
3887 | + struct squashfs_base_inode_header_2 base; | ||
3888 | + struct squashfs_dev_inode_header_2 dev; | ||
3889 | + struct squashfs_symlink_inode_header_2 symlink; | ||
3890 | + struct squashfs_reg_inode_header_2 reg; | ||
3891 | + struct squashfs_dir_inode_header_2 dir; | ||
3892 | + struct squashfs_ldir_inode_header_2 ldir; | ||
3893 | + struct squashfs_ipc_inode_header_2 ipc; | ||
3894 | +}; | ||
3895 | + | ||
3896 | +struct squashfs_dir_header_2 { | ||
3897 | + unsigned int count:8; | ||
3898 | + unsigned int start_block:24; | ||
3899 | +} __attribute__ ((packed)); | ||
3900 | + | ||
3901 | +struct squashfs_dir_entry_2 { | ||
3902 | + unsigned int offset:13; | ||
3903 | + unsigned int type:3; | ||
3904 | + unsigned int size:8; | ||
3905 | + char name[0]; | ||
3906 | +} __attribute__ ((packed)); | ||
3907 | + | ||
3908 | +struct squashfs_fragment_entry_2 { | ||
3909 | + unsigned int start_block; | ||
3910 | + unsigned int size; | ||
3911 | +} __attribute__ ((packed)); | ||
3912 | + | ||
3913 | +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\ | ||
3914 | + SQUASHFS_MEMSET(s, d, n);\ | ||
3915 | + SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\ | ||
3916 | + SQUASHFS_SWAP((s)->mode, d, 4, 12);\ | ||
3917 | + SQUASHFS_SWAP((s)->uid, d, 16, 8);\ | ||
3918 | + SQUASHFS_SWAP((s)->guid, d, 24, 8);\ | ||
3919 | + | ||
3920 | +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\ | ||
3921 | + SQUASHFS_SWAP_START\ | ||
3922 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\ | ||
3923 | +} | ||
3924 | + | ||
3925 | +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \ | ||
3926 | + SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2)) | ||
3927 | + | ||
3928 | +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\ | ||
3929 | + SQUASHFS_SWAP_START\ | ||
3930 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | ||
3931 | + sizeof(struct squashfs_dev_inode_header_2)); \ | ||
3932 | + SQUASHFS_SWAP((s)->rdev, d, 32, 16);\ | ||
3933 | +} | ||
3934 | + | ||
3935 | +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\ | ||
3936 | + SQUASHFS_SWAP_START\ | ||
3937 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | ||
3938 | + sizeof(struct squashfs_symlink_inode_header_2));\ | ||
3939 | + SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\ | ||
3940 | +} | ||
3941 | + | ||
3942 | +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\ | ||
3943 | + SQUASHFS_SWAP_START\ | ||
3944 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | ||
3945 | + sizeof(struct squashfs_reg_inode_header_2));\ | ||
3946 | + SQUASHFS_SWAP((s)->mtime, d, 32, 32);\ | ||
3947 | + SQUASHFS_SWAP((s)->start_block, d, 64, 32);\ | ||
3948 | + SQUASHFS_SWAP((s)->fragment, d, 96, 32);\ | ||
3949 | + SQUASHFS_SWAP((s)->offset, d, 128, 32);\ | ||
3950 | + SQUASHFS_SWAP((s)->file_size, d, 160, 32);\ | ||
3951 | +} | ||
3952 | + | ||
3953 | +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\ | ||
3954 | + SQUASHFS_SWAP_START\ | ||
3955 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | ||
3956 | + sizeof(struct squashfs_dir_inode_header_2));\ | ||
3957 | + SQUASHFS_SWAP((s)->file_size, d, 32, 19);\ | ||
3958 | + SQUASHFS_SWAP((s)->offset, d, 51, 13);\ | ||
3959 | + SQUASHFS_SWAP((s)->mtime, d, 64, 32);\ | ||
3960 | + SQUASHFS_SWAP((s)->start_block, d, 96, 24);\ | ||
3961 | +} | ||
3962 | + | ||
3963 | +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\ | ||
3964 | + SQUASHFS_SWAP_START\ | ||
3965 | + SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \ | ||
3966 | + sizeof(struct squashfs_ldir_inode_header_2));\ | ||
3967 | + SQUASHFS_SWAP((s)->file_size, d, 32, 27);\ | ||
3968 | + SQUASHFS_SWAP((s)->offset, d, 59, 13);\ | ||
3969 | + SQUASHFS_SWAP((s)->mtime, d, 72, 32);\ | ||
3970 | + SQUASHFS_SWAP((s)->start_block, d, 104, 24);\ | ||
3971 | + SQUASHFS_SWAP((s)->i_count, d, 128, 16);\ | ||
3972 | +} | ||
3973 | + | ||
3974 | +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\ | ||
3975 | + SQUASHFS_SWAP_START\ | ||
3976 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\ | ||
3977 | + SQUASHFS_SWAP((s)->index, d, 0, 27);\ | ||
3978 | + SQUASHFS_SWAP((s)->start_block, d, 27, 29);\ | ||
3979 | + SQUASHFS_SWAP((s)->size, d, 56, 8);\ | ||
3980 | +} | ||
3981 | +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\ | ||
3982 | + SQUASHFS_SWAP_START\ | ||
3983 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\ | ||
3984 | + SQUASHFS_SWAP((s)->count, d, 0, 8);\ | ||
3985 | + SQUASHFS_SWAP((s)->start_block, d, 8, 24);\ | ||
3986 | +} | ||
3987 | + | ||
3988 | +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\ | ||
3989 | + SQUASHFS_SWAP_START\ | ||
3990 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\ | ||
3991 | + SQUASHFS_SWAP((s)->offset, d, 0, 13);\ | ||
3992 | + SQUASHFS_SWAP((s)->type, d, 13, 3);\ | ||
3993 | + SQUASHFS_SWAP((s)->size, d, 16, 8);\ | ||
3994 | +} | ||
3995 | + | ||
3996 | +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\ | ||
3997 | + SQUASHFS_SWAP_START\ | ||
3998 | + SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\ | ||
3999 | + SQUASHFS_SWAP((s)->start_block, d, 0, 32);\ | ||
4000 | + SQUASHFS_SWAP((s)->size, d, 32, 32);\ | ||
4001 | +} | ||
4002 | + | ||
4003 | +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n) | ||
4004 | + | ||
4005 | +/* fragment and fragment table defines */ | ||
4006 | +#define SQUASHFS_FRAGMENT_BYTES_2(A) (A * sizeof(struct squashfs_fragment_entry_2)) | ||
4007 | + | ||
4008 | +#define SQUASHFS_FRAGMENT_INDEX_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) / \ | ||
4009 | + SQUASHFS_METADATA_SIZE) | ||
4010 | + | ||
4011 | +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) % \ | ||
4012 | + SQUASHFS_METADATA_SIZE) | ||
4013 | + | ||
4014 | +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \ | ||
4015 | + SQUASHFS_METADATA_SIZE - 1) / \ | ||
4016 | + SQUASHFS_METADATA_SIZE) | ||
4017 | + | ||
4018 | +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A) (SQUASHFS_FRAGMENT_INDEXES_2(A) *\ | ||
4019 | + sizeof(int)) | ||
4020 | + | ||
4021 | +#endif | ||
4022 | + | ||
4023 | +#ifdef __KERNEL__ | ||
4024 | + | ||
4025 | +/* | ||
4026 | + * macros used to swap each structure entry, taking into account | ||
4027 | + * bitfields and different bitfield placing conventions on differing | ||
4028 | + * architectures | ||
4029 | + */ | ||
4030 | + | ||
4031 | +#include <asm/byteorder.h> | ||
4032 | + | ||
4033 | +#ifdef __BIG_ENDIAN | ||
4034 | + /* convert from little endian to big endian */ | ||
4035 | +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \ | ||
4036 | + tbits, b_pos) | ||
4037 | +#else | ||
4038 | + /* convert from big endian to little endian */ | ||
4039 | +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \ | ||
4040 | + tbits, 64 - tbits - b_pos) | ||
4041 | +#endif | ||
4042 | + | ||
4043 | +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\ | ||
4044 | + b_pos = pos % 8;\ | ||
4045 | + val = 0;\ | ||
4046 | + s = (unsigned char *)p + (pos / 8);\ | ||
4047 | + d = ((unsigned char *) &val) + 7;\ | ||
4048 | + for(bits = 0; bits < (tbits + b_pos); bits += 8) \ | ||
4049 | + *d-- = *s++;\ | ||
4050 | + value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\ | ||
4051 | +} | ||
4052 | + | ||
4053 | +#define SQUASHFS_MEMSET(s, d, n) memset(s, 0, n); | ||
4054 | + | ||
4055 | +#endif | ||
4056 | +#endif | ||
4057 | Index: linux-2.6.25-gentoo/include/linux/squashfs_fs_i.h | ||
4058 | =================================================================== | ||
4059 | --- /dev/null | ||
4060 | +++ linux-2.6.25-gentoo/include/linux/squashfs_fs_i.h | ||
4061 | @@ -0,0 +1,45 @@ | ||
4062 | +#ifndef SQUASHFS_FS_I | ||
4063 | +#define SQUASHFS_FS_I | ||
4064 | +/* | ||
4065 | + * Squashfs | ||
4066 | + * | ||
4067 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007 | ||
4068 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
4069 | + * | ||
4070 | + * This program is free software; you can redistribute it and/or | ||
4071 | + * modify it under the terms of the GNU General Public License | ||
4072 | + * as published by the Free Software Foundation; either version 2, | ||
4073 | + * or (at your option) any later version. | ||
4074 | + * | ||
4075 | + * This program is distributed in the hope that it will be useful, | ||
4076 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
4077 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
4078 | + * GNU General Public License for more details. | ||
4079 | + * | ||
4080 | + * You should have received a copy of the GNU General Public License | ||
4081 | + * along with this program; if not, write to the Free Software | ||
4082 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
4083 | + * | ||
4084 | + * squashfs_fs_i.h | ||
4085 | + */ | ||
4086 | + | ||
4087 | +struct squashfs_inode_info { | ||
4088 | + long long start_block; | ||
4089 | + unsigned int offset; | ||
4090 | + union { | ||
4091 | + struct { | ||
4092 | + long long fragment_start_block; | ||
4093 | + unsigned int fragment_size; | ||
4094 | + unsigned int fragment_offset; | ||
4095 | + long long block_list_start; | ||
4096 | + } s1; | ||
4097 | + struct { | ||
4098 | + long long directory_index_start; | ||
4099 | + unsigned int directory_index_offset; | ||
4100 | + unsigned int directory_index_count; | ||
4101 | + unsigned int parent_inode; | ||
4102 | + } s2; | ||
4103 | + } u; | ||
4104 | + struct inode vfs_inode; | ||
4105 | +}; | ||
4106 | +#endif | ||
4107 | Index: linux-2.6.25-gentoo/include/linux/squashfs_fs_sb.h | ||
4108 | =================================================================== | ||
4109 | --- /dev/null | ||
4110 | +++ linux-2.6.25-gentoo/include/linux/squashfs_fs_sb.h | ||
4111 | @@ -0,0 +1,76 @@ | ||
4112 | +#ifndef SQUASHFS_FS_SB | ||
4113 | +#define SQUASHFS_FS_SB | ||
4114 | +/* | ||
4115 | + * Squashfs | ||
4116 | + * | ||
4117 | + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007 | ||
4118 | + * Phillip Lougher <phillip@lougher.demon.co.uk> | ||
4119 | + * | ||
4120 | + * This program is free software; you can redistribute it and/or | ||
4121 | + * modify it under the terms of the GNU General Public License | ||
4122 | + * as published by the Free Software Foundation; either version 2, | ||
4123 | + * or (at your option) any later version. | ||
4124 | + * | ||
4125 | + * This program is distributed in the hope that it will be useful, | ||
4126 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
4127 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
4128 | + * GNU General Public License for more details. | ||
4129 | + * | ||
4130 | + * You should have received a copy of the GNU General Public License | ||
4131 | + * along with this program; if not, write to the Free Software | ||
4132 | + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
4133 | + * | ||
4134 | + * squashfs_fs_sb.h | ||
4135 | + */ | ||
4136 | + | ||
4137 | +#include <linux/squashfs_fs.h> | ||
4138 | + | ||
4139 | +struct squashfs_cache { | ||
4140 | + long long block; | ||
4141 | + int length; | ||
4142 | + long long next_index; | ||
4143 | + char *data; | ||
4144 | +}; | ||
4145 | + | ||
4146 | +struct squashfs_fragment_cache { | ||
4147 | + long long block; | ||
4148 | + int length; | ||
4149 | + unsigned int locked; | ||
4150 | + char *data; | ||
4151 | +}; | ||
4152 | + | ||
4153 | +struct squashfs_sb_info { | ||
4154 | + struct squashfs_super_block sblk; | ||
4155 | + int devblksize; | ||
4156 | + int devblksize_log2; | ||
4157 | + int swap; | ||
4158 | + struct squashfs_cache *block_cache; | ||
4159 | + struct squashfs_fragment_cache *fragment; | ||
4160 | + int next_cache; | ||
4161 | + int next_fragment; | ||
4162 | + int next_meta_index; | ||
4163 | + unsigned int *uid; | ||
4164 | + unsigned int *guid; | ||
4165 | + long long *fragment_index; | ||
4166 | + unsigned int *fragment_index_2; | ||
4167 | + char *read_page; | ||
4168 | + struct mutex read_data_mutex; | ||
4169 | + struct mutex read_page_mutex; | ||
4170 | + struct mutex block_cache_mutex; | ||
4171 | + struct mutex fragment_mutex; | ||
4172 | + struct mutex meta_index_mutex; | ||
4173 | + wait_queue_head_t waitq; | ||
4174 | + wait_queue_head_t fragment_wait_queue; | ||
4175 | + struct meta_index *meta_index; | ||
4176 | + z_stream stream; | ||
4177 | + long long *inode_lookup_table; | ||
4178 | + int unused_cache_blks; | ||
4179 | + int unused_frag_blks; | ||
4180 | + int (*read_inode)(struct inode *i, squashfs_inode_t \ | ||
4181 | + inode); | ||
4182 | + long long (*read_blocklist)(struct inode *inode, int \ | ||
4183 | + index, int readahead_blks, char *block_list, \ | ||
4184 | + unsigned short **block_p, unsigned int *bsize); | ||
4185 | + int (*read_fragment_index_table)(struct super_block *s); | ||
4186 | +}; | ||
4187 | +#endif | ||
4188 | Index: linux-2.6.25-gentoo/init/do_mounts_rd.c | ||
4189 | =================================================================== | ||
4190 | --- linux-2.6.25-gentoo.orig/init/do_mounts_rd.c | ||
4191 | +++ linux-2.6.25-gentoo/init/do_mounts_rd.c | ||
4192 | @@ -5,6 +5,7 @@ | ||
4193 | #include <linux/ext2_fs.h> | ||
4194 | #include <linux/romfs_fs.h> | ||
4195 | #include <linux/cramfs_fs.h> | ||
4196 | +#include <linux/squashfs_fs.h> | ||
4197 | #include <linux/initrd.h> | ||
4198 | #include <linux/string.h> | ||
4199 | |||
4200 | @@ -39,6 +40,7 @@ static int __init crd_load(int in_fd, in | ||
4201 | * numbers could not be found. | ||
4202 | * | ||
4203 | * We currently check for the following magic numbers: | ||
4204 | + * squashfs | ||
4205 | * minix | ||
4206 | * ext2 | ||
4207 | * romfs | ||
4208 | @@ -53,6 +55,7 @@ identify_ramdisk_image(int fd, int start | ||
4209 | struct ext2_super_block *ext2sb; | ||
4210 | struct romfs_super_block *romfsb; | ||
4211 | struct cramfs_super *cramfsb; | ||
4212 | + struct squashfs_super_block *squashfsb; | ||
4213 | int nblocks = -1; | ||
4214 | unsigned char *buf; | ||
4215 | |||
4216 | @@ -64,6 +67,7 @@ identify_ramdisk_image(int fd, int start | ||
4217 | ext2sb = (struct ext2_super_block *) buf; | ||
4218 | romfsb = (struct romfs_super_block *) buf; | ||
4219 | cramfsb = (struct cramfs_super *) buf; | ||
4220 | + squashfsb = (struct squashfs_super_block *) buf; | ||
4221 | memset(buf, 0xe5, size); | ||
4222 | |||
4223 | /* | ||
4224 | @@ -101,6 +105,18 @@ identify_ramdisk_image(int fd, int start | ||
4225 | goto done; | ||
4226 | } | ||
4227 | |||
4228 | + /* squashfs is at block zero too */ | ||
4229 | + if (squashfsb->s_magic == SQUASHFS_MAGIC) { | ||
4230 | + printk(KERN_NOTICE | ||
4231 | + "RAMDISK: squashfs filesystem found at block %d\n", | ||
4232 | + start_block); | ||
4233 | + if (squashfsb->s_major < 3) | ||
4234 | + nblocks = (squashfsb->bytes_used_2+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | ||
4235 | + else | ||
4236 | + nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | ||
4237 | + goto done; | ||
4238 | + } | ||
4239 | + | ||
4240 | /* | ||
4241 | * Read block 1 to test for minix and ext2 superblock | ||
4242 | */ |