?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
MOXA linux-2.6.x / linux-2.6.19-uc1 from UC-7110-LX-BOOTLOADER-1.9_VERSION-4.2.tgz
[linux-2.6.19-moxart.git] / fs / squashfs / inode.c
blobf64dcd51658ca5f2f26467e4fea19381f4d350c5
1 /*
2 * Squashfs - a compressed read only filesystem for Linux
3 *
4 * Copyright (c) 2002, 2003, 2004, 2005 Phillip Lougher <phillip@lougher.demon.co.uk>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2,
9 * or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 * inode.c
21 */
22
23 #define SQUASHFS_1_0_COMPATIBILITY
24
25 #include <linux/types.h>
26 #include <linux/squashfs_fs.h>
27 #include <linux/module.h>
28 #include <linux/errno.h>
29 #include <linux/slab.h>
30 #include <linux/fs.h>
31 #include <linux/smp_lock.h>
32 #include <linux/slab.h>
33 #include <linux/squashfs_fs_sb.h>
34 #include <linux/squashfs_fs_i.h>
35 #include <linux/buffer_head.h>
36 #include <linux/vfs.h>
37 #include <linux/init.h>
38 #include <linux/dcache.h>
39 #include <asm/uaccess.h>
40 #include <linux/wait.h>
41 #include <asm/semaphore.h>
42
43 #ifdef CONFIG_SQUASHFS_LZMA
44 #include "LzmaWrapper.h"
45 #else
46 #include <linux/zlib.h>
47 #endif
48
49 #include <linux/blkdev.h>
50 #include <linux/vmalloc.h>
51
52 #ifdef SQUASHFS_TRACE
53 #define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS: "s, ## args)
54 #else
55 #define TRACE(s, args...) {}
56 #endif
57
58 #define ERROR(s, args...) printk(KERN_ERR "SQUASHFS error: "s, ## args)
59
60 #define SERROR(s, args...) if(!silent) printk(KERN_ERR "SQUASHFS error: "s, ## args)
61 #define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args)
62
63 static void squashfs_put_super(struct super_block *);
64 static int squashfs_statfs(struct dentry *, struct kstatfs *);
65 static int squashfs_symlink_readpage(struct file *file, struct page *page);
66 static int squashfs_readpage(struct file *file, struct page *page);
67 static int squashfs_readpage4K(struct file *file, struct page *page);
68 static int squashfs_readdir(struct file *, void *, filldir_t);
69 static struct dentry *squashfs_lookup(struct inode *, struct dentry *, struct nameidata *);
70 static unsigned int read_data(struct super_block *s, char *buffer,
71 unsigned int index, unsigned int length, unsigned int *next_index);
72 static int squashfs_get_cached_block(struct super_block *s, char *buffer,
73 unsigned int block, unsigned int offset, int length,
74 unsigned int *next_block, unsigned int *next_offset);
75 static struct inode *squashfs_iget(struct super_block *s, squashfs_inode inode);
76 static unsigned int read_blocklist(struct inode *inode, int index, int readahead_blks,
77 char *block_list, unsigned short **block_p, unsigned int *bsize);
78 static void squashfs_put_super(struct super_block *s);
79 static int squashfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
80 static struct inode *squashfs_alloc_inode(struct super_block *sb);
81 static void squashfs_destroy_inode(struct inode *inode);
82 static int init_inodecache(void);
83 static void destroy_inodecache(void);
84
85 #ifdef SQUASHFS_1_0_COMPATIBILITY
86 static int squashfs_readpage_lessthan4K(struct file *file, struct page *page);
87 static struct inode *squashfs_iget_1(struct super_block *s, squashfs_inode inode);
88 static unsigned int read_blocklist_1(struct inode *inode, int index, int readahead_blks,
89 char *block_list, unsigned short **block_p, unsigned int *bsize);
90 #endif
91
92 DECLARE_MUTEX(read_data_mutex);
93
94 #ifdef CONFIG_SQUASHFS_LZMA
95 static char *lzma_data;
96 #else
97 static z_stream stream;
98 #endif
99
100 static struct file_system_type squashfs_fs_type = {
101 .owner = THIS_MODULE,
102 .name = "squashfs",
103 .get_sb = squashfs_get_sb,
104 .kill_sb = kill_block_super,
105 .fs_flags = FS_REQUIRES_DEV
106 };
107
108 static unsigned char squashfs_filetype_table[] = {
109 DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
110 };
111
112 static struct super_operations squashfs_ops = {
113 .alloc_inode = squashfs_alloc_inode,
114 .destroy_inode = squashfs_destroy_inode,
115 .statfs = squashfs_statfs,
116 .put_super = squashfs_put_super,
117 };
118
119 static struct address_space_operations squashfs_symlink_aops = {
120 .readpage = squashfs_symlink_readpage
121 };
122
123 static struct address_space_operations squashfs_aops = {
124 .readpage = squashfs_readpage
125 };
126
127 static struct address_space_operations squashfs_aops_4K = {
128 .readpage = squashfs_readpage4K
129 };
130
131 #ifdef SQUASHFS_1_0_COMPATIBILITY
132 static struct address_space_operations squashfs_aops_lessthan4K = {
133 .readpage = squashfs_readpage_lessthan4K
134 };
135 #endif
136
137 static struct file_operations squashfs_dir_ops = {
138 .read = generic_read_dir,
139 .readdir = squashfs_readdir
140 };
141
142 static struct inode_operations squashfs_dir_inode_ops = {
143 .lookup = squashfs_lookup
144 };
145
146
147 static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
148 {
149 return list_entry(inode, struct squashfs_inode_info, vfs_inode);
150 }
151
152
153 static struct buffer_head *get_block_length(struct super_block *s,
154 int *cur_index, int *offset, int *c_byte)
155 {
156 squashfs_sb_info *msblk = s->s_fs_info;
157 unsigned short temp;
158 struct buffer_head *bh;
159
160 if (!(bh = sb_bread(s, *cur_index)))
161 goto out;
162
163 if (msblk->devblksize - *offset == 1) {
164 if (msblk->swap)
165 ((unsigned char *) &temp)[1] = *((unsigned char *)
166 (bh->b_data + *offset));
167 else
168 ((unsigned char *) &temp)[0] = *((unsigned char *)
169 (bh->b_data + *offset));
170 brelse(bh);
171 if (!(bh = sb_bread(s, ++(*cur_index))))
172 goto out;
173 if (msblk->swap)
174 ((unsigned char *) &temp)[0] = *((unsigned char *)
175 bh->b_data);
176 else
177 ((unsigned char *) &temp)[1] = *((unsigned char *)
178 bh->b_data);
179 *c_byte = temp;
180 *offset = 1;
181 } else {
182 if (msblk->swap) {
183 ((unsigned char *) &temp)[1] = *((unsigned char *)
184 (bh->b_data + *offset));
185 ((unsigned char *) &temp)[0] = *((unsigned char *)
186 (bh->b_data + *offset + 1));
187 } else {
188 ((unsigned char *) &temp)[0] = *((unsigned char *)
189 (bh->b_data + *offset));
190 ((unsigned char *) &temp)[1] = *((unsigned char *)
191 (bh->b_data + *offset + 1));
192 }
193 *c_byte = temp;
194 *offset += 2;
195 }
196
197 if (SQUASHFS_CHECK_DATA(msblk->sBlk.flags)) {
198 if (*offset == msblk->devblksize) {
199 brelse(bh);
200 if (!(bh = sb_bread(s, ++(*cur_index))))
201 goto out;
202 *offset = 0;
203 }
204 if (*((unsigned char *) (bh->b_data + *offset)) !=
205 SQUASHFS_MARKER_BYTE) {
206 ERROR("Metadata block marker corrupt @ %x\n",
207 *cur_index);
208 brelse(bh);
209 goto out;
210 }
211 (*offset)++;
212 }
213 return bh;
214
215 out:
216 return NULL;
217 }
218
219
220 static unsigned int read_data(struct super_block *s, char *buffer,
221 unsigned int index, unsigned int length, unsigned int *next_index)
222 {
223 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
224 struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >> msBlk->devblksize_log2) + 2];
225 unsigned int offset = index & ((1 << msBlk->devblksize_log2) - 1);
226 unsigned int cur_index = index >> msBlk->devblksize_log2;
227 int bytes, avail_bytes, b = 0, k;
228 char *c_buffer;
229 unsigned int compressed;
230 unsigned int c_byte = length;
231
232 if(c_byte) {
233 bytes = msBlk->devblksize - offset;
234 compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
235 c_buffer = compressed ? msBlk->read_data : buffer;
236 c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
237
238 TRACE("Block @ 0x%x, %scompressed size %d\n", index, compressed ? "" : "un", (unsigned int) c_byte);
239
240 if(!(bh[0] = sb_getblk(s, cur_index)))
241 goto block_release;
242 for(b = 1; bytes < c_byte; b++) {
243 if(!(bh[b] = sb_getblk(s, ++cur_index)))
244 goto block_release;
245 bytes += msBlk->devblksize;
246 }
247 ll_rw_block(READ, b, bh);
248 } else {
249 if(!(bh[0] = get_block_length(s, &cur_index, &offset, &c_byte)))
250 goto read_failure;
251
252 bytes = msBlk->devblksize - offset;
253 compressed = SQUASHFS_COMPRESSED(c_byte);
254 c_buffer = compressed ? msBlk->read_data : buffer;
255 c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
256
257 TRACE("Block @ 0x%x, %scompressed size %d\n", index, compressed ? "" : "un", (unsigned int) c_byte);
258
259 for(b = 1; bytes < c_byte; b++) {
260 if(!(bh[b] = sb_getblk(s, ++cur_index)))
261 goto block_release;
262 bytes += msBlk->devblksize;
263 }
264 ll_rw_block(READ, b - 1, bh + 1);
265 }
266
267 if(compressed)
268 down(&read_data_mutex);
269
270 for(bytes = 0, k = 0; k < b; k++) {
271 avail_bytes = (c_byte - bytes) > (msBlk->devblksize - offset) ? msBlk->devblksize - offset : c_byte - bytes;
272 wait_on_buffer(bh[k]);
273 if (!buffer_uptodate(bh[k]))
274 goto block_release;
275 memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
276 bytes += avail_bytes;
277 offset = 0;
278 brelse(bh[k]);
279 }
280
281 /*
282 * uncompress block
283 */
284 if(compressed) {
285 #ifdef CONFIG_SQUASHFS_LZMA
286 int out_size;
287 int lzma_err;
288 out_size=msBlk->read_size;
289
290 if((lzma_err=lzma_inflate(c_buffer, c_byte, buffer, &out_size))){
291 ERROR("lzma returned unexpected result 0x%x\n", lzma_err);
292 bytes = 0;
293 } else
294 bytes = out_size;
295 // printk("out size = %d, processed = %d\n", msBlk->read_size, out_size);
296 #else
297 int zlib_err;
298
299 stream.next_in = c_buffer;
300 stream.avail_in = c_byte;
301 stream.next_out = buffer;
302 stream.avail_out = msBlk->read_size;
303 if(((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
304 ((zlib_err = zlib_inflate(&stream, Z_FINISH)) != Z_STREAM_END) ||
305 ((zlib_err = zlib_inflateEnd(&stream)) != Z_OK)) {
306 ERROR("zlib_fs returned unexpected result 0x%x\n", zlib_err);
307 bytes = 0;
308 } else
309 bytes = stream.total_out;
310 #endif
311 up(&read_data_mutex);
312 }
313
314 if(next_index)
315 *next_index = index + c_byte + (length ? 0 : (SQUASHFS_CHECK_DATA(msBlk->sBlk.flags) ? 3 : 2));
316
317 return bytes;
318
319 block_release:
320 while(--b >= 0) brelse(bh[b]);
321
322 read_failure:
323 ERROR("sb_bread failed reading block 0x%x\n", cur_index);
324 return 0;
325 }
326
327
328 static int squashfs_get_cached_block(struct super_block *s, char *buffer,
329 unsigned int block, unsigned int offset, int length,
330 unsigned int *next_block, unsigned int *next_offset)
331 {
332 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
333 int n, i, bytes, return_length = length;
334 unsigned int next_index;
335
336 TRACE("Entered squashfs_get_cached_block [%x:%x]\n", block, offset);
337
338 for(;;) {
339 for(i = 0; i < SQUASHFS_CACHED_BLKS; i++)
340 if(msBlk->block_cache[i].block == block)
341 break;
342
343 down(&msBlk->block_cache_mutex);
344 if(i == SQUASHFS_CACHED_BLKS) {
345 /* read inode header block */
346 for(i = msBlk->next_cache, n = SQUASHFS_CACHED_BLKS; n ; n --, i = (i + 1) % SQUASHFS_CACHED_BLKS)
347 if(msBlk->block_cache[i].block != SQUASHFS_USED_BLK)
348 break;
349 if(n == 0) {
350 wait_queue_t wait;
351
352 init_waitqueue_entry(&wait, current);
353 add_wait_queue(&msBlk->waitq, &wait);
354 up(&msBlk->block_cache_mutex);
355 set_current_state(TASK_UNINTERRUPTIBLE);
356 schedule();
357 set_current_state(TASK_RUNNING);
358 remove_wait_queue(&msBlk->waitq, &wait);
359 continue;
360 }
361 msBlk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
362
363 if(msBlk->block_cache[i].block == SQUASHFS_INVALID_BLK) {
364 if(!(msBlk->block_cache[i].data = (unsigned char *)
365 kmalloc(SQUASHFS_METADATA_SIZE, GFP_KERNEL))) {
366 ERROR("Failed to allocate cache block\n");
367 up(&msBlk->block_cache_mutex);
368 return 0;
369 }
370 }
371
372 msBlk->block_cache[i].block = SQUASHFS_USED_BLK;
373 up(&msBlk->block_cache_mutex);
374 if(!(msBlk->block_cache[i].length = read_data(s, msBlk->block_cache[i].data, block, 0,
375 &next_index))) {
376 ERROR("Unable to read cache block [%x:%x]\n", block, offset);
377 return 0;
378 }
379 down(&msBlk->block_cache_mutex);
380 wake_up(&msBlk->waitq);
381 msBlk->block_cache[i].block = block;
382 msBlk->block_cache[i].next_index = next_index;
383 TRACE("Read cache block [%x:%x]\n", block, offset);
384 }
385
386 if(msBlk->block_cache[i].block != block) {
387 up(&msBlk->block_cache_mutex);
388 continue;
389 }
390
391 if((bytes = msBlk->block_cache[i].length - offset) >= length) {
392 if(buffer)
393 memcpy(buffer, msBlk->block_cache[i].data + offset, length);
394 if(msBlk->block_cache[i].length - offset == length) {
395 *next_block = msBlk->block_cache[i].next_index;
396 *next_offset = 0;
397 } else {
398 *next_block = block;
399 *next_offset = offset + length;
400 }
401
402 up(&msBlk->block_cache_mutex);
403 return return_length;
404 } else {
405 if(buffer) {
406 memcpy(buffer, msBlk->block_cache[i].data + offset, bytes);
407 buffer += bytes;
408 }
409 block = msBlk->block_cache[i].next_index;
410 up(&msBlk->block_cache_mutex);
411 length -= bytes;
412 offset = 0;
413 }
414 }
415 }
416
417
418 static int get_fragment_location(struct super_block *s, unsigned int fragment, unsigned int *fragment_start_block, unsigned int *fragment_size)
419 {
420 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
421 unsigned int start_block = msBlk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
422 int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
423 squashfs_fragment_entry fragment_entry;
424
425 if(msBlk->swap) {
426 squashfs_fragment_entry sfragment_entry;
427
428 if(!squashfs_get_cached_block(s, (char *) &sfragment_entry, start_block, offset,
429 sizeof(sfragment_entry), &start_block, &offset))
430 return 0;
431 SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
432 } else
433 if(!squashfs_get_cached_block(s, (char *) &fragment_entry, start_block, offset,
434 sizeof(fragment_entry), &start_block, &offset))
435 return 0;
436
437 *fragment_start_block = fragment_entry.start_block;
438 *fragment_size = fragment_entry.size;
439
440 return 1;
441 }
442
443
444 void release_cached_fragment(squashfs_sb_info *msBlk, struct squashfs_fragment_cache *fragment)
445 {
446 down(&msBlk->fragment_mutex);
447 fragment->locked --;
448 wake_up(&msBlk->fragment_wait_queue);
449 up(&msBlk->fragment_mutex);
450 }
451
452
453 struct squashfs_fragment_cache *get_cached_fragment(struct super_block *s, unsigned int start_block, int length)
454 {
455 int i, n;
456 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
457
458 for(;;) {
459 down(&msBlk->fragment_mutex);
460 for(i = 0; i < SQUASHFS_CACHED_FRAGMENTS && msBlk->fragment[i].block != start_block; i++);
461 if(i == SQUASHFS_CACHED_FRAGMENTS) {
462 for(i = msBlk->next_fragment, n = SQUASHFS_CACHED_FRAGMENTS;
463 n && msBlk->fragment[i].locked; n--, i = (i + 1) % SQUASHFS_CACHED_FRAGMENTS);
464
465 if(n == 0) {
466 wait_queue_t wait;
467
468 init_waitqueue_entry(&wait, current);
469 add_wait_queue(&msBlk->fragment_wait_queue, &wait);
470 up(&msBlk->fragment_mutex);
471 set_current_state(TASK_UNINTERRUPTIBLE);
472 schedule();
473 set_current_state(TASK_RUNNING);
474 remove_wait_queue(&msBlk->fragment_wait_queue, &wait);
475 continue;
476 }
477 msBlk->next_fragment = (msBlk->next_fragment + 1) % SQUASHFS_CACHED_FRAGMENTS;
478
479 if(msBlk->fragment[i].data == NULL)
480 if(!(msBlk->fragment[i].data = (unsigned char *)
481 SQUASHFS_ALLOC(SQUASHFS_FILE_MAX_SIZE))) {
482 ERROR("Failed to allocate fragment cache block\n");
483 up(&msBlk->fragment_mutex);
484 return NULL;
485 }
486
487 msBlk->fragment[i].block = SQUASHFS_INVALID_BLK;
488 msBlk->fragment[i].locked = 1;
489 up(&msBlk->fragment_mutex);
490 if(!(msBlk->fragment[i].length = read_data(s, msBlk->fragment[i].data, start_block, length,
491 NULL))) {
492 ERROR("Unable to read fragment cache block [%x]\n", start_block);
493 msBlk->fragment[i].locked = 0;
494 return NULL;
495 }
496 msBlk->fragment[i].block = start_block;
497 TRACE("New fragment %d, start block %d, locked %d\n", i, msBlk->fragment[i].block, msBlk->fragment[i].locked);
498 return &msBlk->fragment[i];
499 }
500
501 msBlk->fragment[i].locked ++;
502 up(&msBlk->fragment_mutex);
503
504 TRACE("Got fragment %d, start block %d, locked %d\n", i, msBlk->fragment[i].block, msBlk->fragment[i].locked);
505 return &msBlk->fragment[i];
506 }
507 }
508
509
510 #ifdef SQUASHFS_1_0_COMPATIBILITY
511 static struct inode *squashfs_iget_1(struct super_block *s, squashfs_inode inode)
512 {
513 struct inode *i = new_inode(s);
514 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
515 squashfs_super_block *sBlk = &msBlk->sBlk;
516 unsigned int block = SQUASHFS_INODE_BLK(inode) + sBlk->inode_table_start;
517 unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
518 unsigned int next_block, next_offset;
519 squashfs_base_inode_header_1 inodeb;
520
521 TRACE("Entered squashfs_iget_1\n");
522
523 if(msBlk->swap) {
524 squashfs_base_inode_header_1 sinodeb;
525
526 if(!squashfs_get_cached_block(s, (char *) &sinodeb, block, offset,
527 sizeof(sinodeb), &next_block, &next_offset))
528 goto failed_read;
529 SQUASHFS_SWAP_BASE_INODE_HEADER_1(&inodeb, &sinodeb, sizeof(sinodeb));
530 } else
531 if(!squashfs_get_cached_block(s, (char *) &inodeb, block, offset,
532 sizeof(inodeb), &next_block, &next_offset))
533 goto failed_read;
534
535 i->i_nlink = 1;
536
537 i->i_mtime.tv_sec = sBlk->mkfs_time;
538 i->i_atime.tv_sec = sBlk->mkfs_time;
539 i->i_ctime.tv_sec = sBlk->mkfs_time;
540
541 if(inodeb.inode_type != SQUASHFS_IPC_TYPE)
542 i->i_uid = msBlk->uid[((inodeb.inode_type - 1) / SQUASHFS_TYPES) * 16 + inodeb.uid];
543 i->i_ino = SQUASHFS_MK_VFS_INODE(block - sBlk->inode_table_start, offset);
544
545 i->i_mode = inodeb.mode;
546
547 switch(inodeb.inode_type == SQUASHFS_IPC_TYPE ? SQUASHFS_IPC_TYPE : (inodeb.inode_type - 1) % SQUASHFS_TYPES + 1) {
548 case SQUASHFS_FILE_TYPE: {
549 squashfs_reg_inode_header_1 inodep;
550
551 if(msBlk->swap) {
552 squashfs_reg_inode_header_1 sinodep;
553
554 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
555 &next_block, &next_offset))
556 goto failed_read;
557 SQUASHFS_SWAP_REG_INODE_HEADER_1(&inodep, &sinodep);
558 } else
559 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
560 &next_block, &next_offset))
561 goto failed_read;
562
563 i->i_size = inodep.file_size;
564 i->i_fop = &generic_ro_fops;
565 if(sBlk->block_size > 4096)
566 i->i_data.a_ops = &squashfs_aops;
567 else if(sBlk->block_size == 4096)
568 i->i_data.a_ops = &squashfs_aops_4K;
569 else
570 i->i_data.a_ops = &squashfs_aops_lessthan4K;
571 i->i_mode |= S_IFREG;
572 i->i_mtime.tv_sec = inodep.mtime;
573 i->i_atime.tv_sec = inodep.mtime;
574 i->i_ctime.tv_sec = inodep.mtime;
575 i->i_blocks = ((i->i_size - 1) >> 9) + 1;
576 SQUASHFS_I(i)->u.s1.fragment_start_block = SQUASHFS_INVALID_BLK;
577 SQUASHFS_I(i)->u.s1.fragment_offset = 0;
578 SQUASHFS_I(i)->start_block = inodep.start_block;
579 SQUASHFS_I(i)->block_list_start = next_block;
580 SQUASHFS_I(i)->offset = next_offset;
581 TRACE("File inode %x:%x, start_block %x, block_list_start %x, offset %x\n",
582 SQUASHFS_INODE_BLK(inode), offset, inodep.start_block, next_block, next_offset);
583 break;
584 }
585 case SQUASHFS_DIR_TYPE: {
586 squashfs_dir_inode_header_1 inodep;
587
588 if(msBlk->swap) {
589 squashfs_dir_inode_header_1 sinodep;
590
591 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
592 &next_block, &next_offset))
593 goto failed_read;
594 SQUASHFS_SWAP_DIR_INODE_HEADER_1(&inodep, &sinodep);
595 } else
596 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
597 &next_block, &next_offset))
598 goto failed_read;
599
600 i->i_size = inodep.file_size;
601 i->i_op = &squashfs_dir_inode_ops;
602 i->i_fop = &squashfs_dir_ops;
603 i->i_mode |= S_IFDIR;
604 i->i_mtime.tv_sec = inodep.mtime;
605 i->i_atime.tv_sec = inodep.mtime;
606 i->i_ctime.tv_sec = inodep.mtime;
607 SQUASHFS_I(i)->start_block = inodep.start_block;
608 SQUASHFS_I(i)->offset = inodep.offset;
609 SQUASHFS_I(i)->u.s2.directory_index_count = 0;
610 TRACE("Directory inode %x:%x, start_block %x, offset %x\n", SQUASHFS_INODE_BLK(inode), offset,
611 inodep.start_block, inodep.offset);
612 break;
613 }
614 case SQUASHFS_SYMLINK_TYPE: {
615 squashfs_symlink_inode_header_1 inodep;
616
617 if(msBlk->swap) {
618 squashfs_symlink_inode_header_1 sinodep;
619
620 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
621 &next_block, &next_offset))
622 goto failed_read;
623 SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(&inodep, &sinodep);
624 } else
625 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
626 &next_block, &next_offset))
627 goto failed_read;
628
629 i->i_size = inodep.symlink_size;
630 i->i_op = &page_symlink_inode_operations;
631 i->i_data.a_ops = &squashfs_symlink_aops;
632 i->i_mode |= S_IFLNK;
633 SQUASHFS_I(i)->start_block = next_block;
634 SQUASHFS_I(i)->offset = next_offset;
635 TRACE("Symbolic link inode %x:%x, start_block %x, offset %x\n",
636 SQUASHFS_INODE_BLK(inode), offset, next_block, next_offset);
637 break;
638 }
639 case SQUASHFS_BLKDEV_TYPE:
640 case SQUASHFS_CHRDEV_TYPE: {
641 squashfs_dev_inode_header_1 inodep;
642
643 if(msBlk->swap) {
644 squashfs_dev_inode_header_1 sinodep;
645
646 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
647 &next_block, &next_offset))
648 goto failed_read;
649 SQUASHFS_SWAP_DEV_INODE_HEADER_1(&inodep, &sinodep);
650 } else
651 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
652 &next_block, &next_offset))
653 goto failed_read;
654
655 i->i_size = 0;
656 i->i_mode |= (inodeb.inode_type == SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : S_IFBLK;
657 init_special_inode(i, i->i_mode, old_decode_dev(inodep.rdev));
658 TRACE("Device inode %x:%x, rdev %x\n", SQUASHFS_INODE_BLK(inode), offset, inodep.rdev);
659 break;
660 }
661 case SQUASHFS_IPC_TYPE: {
662 squashfs_ipc_inode_header_1 inodep;
663
664 if(msBlk->swap) {
665 squashfs_ipc_inode_header_1 sinodep;
666
667 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
668 &next_block, &next_offset))
669 goto failed_read;
670 SQUASHFS_SWAP_IPC_INODE_HEADER_1(&inodep, &sinodep);
671 } else
672 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
673 &next_block, &next_offset))
674 goto failed_read;
675
676 i->i_size = 0;
677 i->i_mode |= (inodep.type == SQUASHFS_FIFO_TYPE) ? S_IFIFO : S_IFSOCK;
678 i->i_uid = msBlk->uid[inodep.offset * 16 + inodeb.uid];
679 init_special_inode(i, i->i_mode, 0);
680 break;
681 }
682 default:
683 ERROR("Unknown inode type %d in squashfs_iget!\n", inodeb.inode_type);
684 goto failed_read1;
685 }
686
687 if(inodeb.guid == 15)
688 i->i_gid = i->i_uid;
689 else
690 i->i_gid = msBlk->guid[inodeb.guid];
691
692 insert_inode_hash(i);
693 return i;
694
695 failed_read:
696 ERROR("Unable to read inode [%x:%x]\n", block, offset);
697
698 failed_read1:
699 return NULL;
700 }
701 #endif
702
703
704 static struct inode *squashfs_iget(struct super_block *s, squashfs_inode inode)
705 {
706 struct inode *i = new_inode(s);
707 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
708 squashfs_super_block *sBlk = &msBlk->sBlk;
709 unsigned int block = SQUASHFS_INODE_BLK(inode) + sBlk->inode_table_start;
710 unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
711 unsigned int next_block, next_offset;
712 squashfs_base_inode_header inodeb;
713
714 TRACE("Entered squashfs_iget\n");
715
716 if(msBlk->swap) {
717 squashfs_base_inode_header sinodeb;
718
719 if(!squashfs_get_cached_block(s, (char *) &sinodeb, block, offset,
720 sizeof(sinodeb), &next_block, &next_offset))
721 goto failed_read;
722 SQUASHFS_SWAP_BASE_INODE_HEADER(&inodeb, &sinodeb, sizeof(sinodeb));
723 } else
724 if(!squashfs_get_cached_block(s, (char *) &inodeb, block, offset,
725 sizeof(inodeb), &next_block, &next_offset))
726 goto failed_read;
727
728 i->i_nlink = 1;
729
730 i->i_mtime.tv_sec = sBlk->mkfs_time;
731 i->i_atime.tv_sec = sBlk->mkfs_time;
732 i->i_ctime.tv_sec = sBlk->mkfs_time;
733
734 i->i_uid = msBlk->uid[inodeb.uid];
735 i->i_ino = SQUASHFS_MK_VFS_INODE(block - sBlk->inode_table_start, offset);
736
737 i->i_mode = inodeb.mode;
738
739 switch(inodeb.inode_type) {
740 case SQUASHFS_FILE_TYPE: {
741 squashfs_reg_inode_header inodep;
742
743 if(msBlk->swap) {
744 squashfs_reg_inode_header sinodep;
745
746 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
747 &next_block, &next_offset))
748 goto failed_read;
749 SQUASHFS_SWAP_REG_INODE_HEADER(&inodep, &sinodep);
750 } else
751 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
752 &next_block, &next_offset))
753 goto failed_read;
754
755 SQUASHFS_I(i)->u.s1.fragment_start_block = SQUASHFS_INVALID_BLK;
756 if(inodep.fragment != SQUASHFS_INVALID_BLK && !get_fragment_location(s, inodep.fragment,
757 &SQUASHFS_I(i)->u.s1.fragment_start_block, &SQUASHFS_I(i)->u.s1.fragment_size))
758 goto failed_read;
759
760 SQUASHFS_I(i)->u.s1.fragment_offset = inodep.offset;
761 i->i_size = inodep.file_size;
762 i->i_fop = &generic_ro_fops;
763 if(sBlk->block_size > 4096)
764 i->i_data.a_ops = &squashfs_aops;
765 else
766 i->i_data.a_ops = &squashfs_aops_4K;
767 i->i_mode |= S_IFREG;
768 i->i_mtime.tv_sec = inodep.mtime;
769 i->i_atime.tv_sec = inodep.mtime;
770 i->i_ctime.tv_sec = inodep.mtime;
771 i->i_blocks = ((i->i_size - 1) >> 9) + 1;
772 SQUASHFS_I(i)->start_block = inodep.start_block;
773 SQUASHFS_I(i)->block_list_start = next_block;
774 SQUASHFS_I(i)->offset = next_offset;
775 TRACE("File inode %x:%x, start_block %x, block_list_start %x, offset %x\n",
776 SQUASHFS_INODE_BLK(inode), offset, inodep.start_block, next_block, next_offset);
777 break;
778 }
779 case SQUASHFS_DIR_TYPE: {
780 squashfs_dir_inode_header inodep;
781
782 if(msBlk->swap) {
783 squashfs_dir_inode_header sinodep;
784
785 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
786 &next_block, &next_offset))
787 goto failed_read;
788 SQUASHFS_SWAP_DIR_INODE_HEADER(&inodep, &sinodep);
789 } else
790 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
791 &next_block, &next_offset))
792 goto failed_read;
793
794 i->i_size = inodep.file_size;
795 i->i_op = &squashfs_dir_inode_ops;
796 i->i_fop = &squashfs_dir_ops;
797 i->i_mode |= S_IFDIR;
798 i->i_mtime.tv_sec = inodep.mtime;
799 i->i_atime.tv_sec = inodep.mtime;
800 i->i_ctime.tv_sec = inodep.mtime;
801 SQUASHFS_I(i)->start_block = inodep.start_block;
802 SQUASHFS_I(i)->offset = inodep.offset;
803 SQUASHFS_I(i)->u.s2.directory_index_count = 0;
804 TRACE("Directory inode %x:%x, start_block %x, offset %x\n", SQUASHFS_INODE_BLK(inode), offset,
805 inodep.start_block, inodep.offset);
806 break;
807 }
808 case SQUASHFS_LDIR_TYPE: {
809 squashfs_ldir_inode_header inodep;
810
811 if(msBlk->swap) {
812 squashfs_ldir_inode_header sinodep;
813
814 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
815 &next_block, &next_offset))
816 goto failed_read;
817 SQUASHFS_SWAP_LDIR_INODE_HEADER(&inodep, &sinodep);
818 } else
819 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
820 &next_block, &next_offset))
821 goto failed_read;
822
823 i->i_size = inodep.file_size;
824 i->i_op = &squashfs_dir_inode_ops;
825 i->i_fop = &squashfs_dir_ops;
826 i->i_mode |= S_IFDIR;
827 i->i_mtime.tv_sec = inodep.mtime;
828 i->i_atime.tv_sec = inodep.mtime;
829 i->i_ctime.tv_sec = inodep.mtime;
830 SQUASHFS_I(i)->start_block = inodep.start_block;
831 SQUASHFS_I(i)->offset = inodep.offset;
832 SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
833 SQUASHFS_I(i)->u.s2.directory_index_offset = next_offset;
834 SQUASHFS_I(i)->u.s2.directory_index_count = inodep.i_count;
835 TRACE("Long directory inode %x:%x, start_block %x, offset %x\n", SQUASHFS_INODE_BLK(inode), offset,
836 inodep.start_block, inodep.offset);
837 break;
838 }
839 case SQUASHFS_SYMLINK_TYPE: {
840 squashfs_symlink_inode_header inodep;
841
842 if(msBlk->swap) {
843 squashfs_symlink_inode_header sinodep;
844
845 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
846 &next_block, &next_offset))
847 goto failed_read;
848 SQUASHFS_SWAP_SYMLINK_INODE_HEADER(&inodep, &sinodep);
849 } else
850 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
851 &next_block, &next_offset))
852 goto failed_read;
853
854 i->i_size = inodep.symlink_size;
855 i->i_op = &page_symlink_inode_operations;
856 i->i_data.a_ops = &squashfs_symlink_aops;
857 i->i_mode |= S_IFLNK;
858 SQUASHFS_I(i)->start_block = next_block;
859 SQUASHFS_I(i)->offset = next_offset;
860 TRACE("Symbolic link inode %x:%x, start_block %x, offset %x\n",
861 SQUASHFS_INODE_BLK(inode), offset, next_block, next_offset);
862 break;
863 }
864 case SQUASHFS_BLKDEV_TYPE:
865 case SQUASHFS_CHRDEV_TYPE: {
866 squashfs_dev_inode_header inodep;
867
868 if(msBlk->swap) {
869 squashfs_dev_inode_header sinodep;
870
871 if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep),
872 &next_block, &next_offset))
873 goto failed_read;
874 SQUASHFS_SWAP_DEV_INODE_HEADER(&inodep, &sinodep);
875 } else
876 if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep),
877 &next_block, &next_offset))
878 goto failed_read;
879
880 i->i_size = 0;
881 i->i_mode |= (inodeb.inode_type == SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : S_IFBLK;
882 init_special_inode(i, i->i_mode, old_decode_dev(inodep.rdev));
883 TRACE("Device inode %x:%x, rdev %x\n", SQUASHFS_INODE_BLK(inode), offset, inodep.rdev);
884 break;
885 }
886 case SQUASHFS_FIFO_TYPE:
887 case SQUASHFS_SOCKET_TYPE: {
888 i->i_size = 0;
889 i->i_mode |= (inodeb.inode_type == SQUASHFS_FIFO_TYPE) ? S_IFIFO : S_IFSOCK;
890 init_special_inode(i, i->i_mode, 0);
891 break;
892 }
893 default:
894 ERROR("Unknown inode type %d in squashfs_iget!\n", inodeb.inode_type);
895 goto failed_read1;
896 }
897
898 if(inodeb.guid == SQUASHFS_GUIDS)
899 i->i_gid = i->i_uid;
900 else
901 i->i_gid = msBlk->guid[inodeb.guid];
902
903 insert_inode_hash(i);
904 return i;
905
906 failed_read:
907 ERROR("Unable to read inode [%x:%x]\n", block, offset);
908
909 failed_read1:
910 return NULL;
911 }
912
913
914 static int squashfs_fill_super(struct super_block *s,
915 void *data, int silent)
916 {
917 squashfs_sb_info *msBlk;
918 squashfs_super_block *sBlk;
919 int i;
920 char b[BDEVNAME_SIZE];
921
922 TRACE("Entered squashfs_read_superblock\n");
923
924 if(!(s->s_fs_info = (void *) kmalloc(sizeof(squashfs_sb_info), GFP_KERNEL))) {
925 ERROR("Failed to allocate superblock\n");
926 return -ENOMEM;
927 }
928 msBlk = (squashfs_sb_info *) s->s_fs_info;
929 sBlk = &msBlk->sBlk;
930
931 msBlk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
932 msBlk->devblksize_log2 = ffz(~msBlk->devblksize);
933
934 init_MUTEX(&msBlk->read_page_mutex);
935 init_MUTEX(&msBlk->block_cache_mutex);
936 init_MUTEX(&msBlk->fragment_mutex);
937
938 init_waitqueue_head(&msBlk->waitq);
939 init_waitqueue_head(&msBlk->fragment_wait_queue);
940
941 if(!read_data(s, (char *) sBlk, SQUASHFS_START, sizeof(squashfs_super_block) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
942 SERROR("unable to read superblock\n");
943 goto failed_mount;
944 }
945
946 /* Check it is a SQUASHFS superblock */
947 msBlk->swap = 0;
948 if((s->s_magic = sBlk->s_magic) != SQUASHFS_MAGIC) {
949 if(sBlk->s_magic == SQUASHFS_MAGIC_SWAP) {
950 squashfs_super_block sblk;
951 WARNING("Mounting a different endian SQUASHFS filesystem on %s\n", bdevname(s->s_bdev, b));
952 SQUASHFS_SWAP_SUPER_BLOCK(&sblk, sBlk);
953 memcpy(sBlk, &sblk, sizeof(squashfs_super_block));
954 msBlk->swap = 1;
955 } else {
956 SERROR("Can't find a SQUASHFS superblock on %s\n", bdevname(s->s_bdev, b));
957 goto failed_mount;
958 }
959 }
960
961 /* Check the MAJOR & MINOR versions */
962 #ifdef SQUASHFS_1_0_COMPATIBILITY
963 if((sBlk->s_major != 1) && (sBlk->s_major != 2 || sBlk->s_minor > SQUASHFS_MINOR)) {
964 SERROR("Major/Minor mismatch, filesystem is (%d:%d), I support (1 : x) or (2 : <= %d)\n",
965 sBlk->s_major, sBlk->s_minor, SQUASHFS_MINOR);
966 goto failed_mount;
967 }
968 if(sBlk->s_major == 1)
969 sBlk->block_size = sBlk->block_size_1;
970 #else
971 if(sBlk->s_major != SQUASHFS_MAJOR || sBlk->s_minor > SQUASHFS_MINOR) {
972 SERROR("Major/Minor mismatch, filesystem is (%d:%d), I support (%d: <= %d)\n",
973 sBlk->s_major, sBlk->s_minor, SQUASHFS_MAJOR, SQUASHFS_MINOR);
974 goto failed_mount;
975 }
976 #endif
977
978 TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
979 TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(sBlk->flags) ? "un" : "");
980 TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(sBlk->flags) ? "un" : "");
981 TRACE("Check data is %s present in the filesystem\n", SQUASHFS_CHECK_DATA(sBlk->flags) ? "" : "not");
982 TRACE("Filesystem size %d bytes\n", sBlk->bytes_used);
983 TRACE("Block size %d\n", sBlk->block_size);
984 TRACE("Number of inodes %d\n", sBlk->inodes);
985 if(sBlk->s_major > 1)
986 TRACE("Number of fragments %d\n", sBlk->fragments);
987 TRACE("Number of uids %d\n", sBlk->no_uids);
988 TRACE("Number of gids %d\n", sBlk->no_guids);
989 TRACE("sBlk->inode_table_start %x\n", sBlk->inode_table_start);
990 TRACE("sBlk->directory_table_start %x\n", sBlk->directory_table_start);
991 if(sBlk->s_major > 1)
992 TRACE("sBlk->fragment_table_start %x\n", sBlk->fragment_table_start);
993 TRACE("sBlk->uid_start %x\n", sBlk->uid_start);
994
995 s->s_flags |= MS_RDONLY;
996 s->s_op = &squashfs_ops;
997
998 /* Init inode_table block pointer array */
999 if(!(msBlk->block_cache = (squashfs_cache *) kmalloc(sizeof(squashfs_cache) * SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
1000 ERROR("Failed to allocate block cache\n");
1001 goto failed_mount;
1002 }
1003
1004 for(i = 0; i < SQUASHFS_CACHED_BLKS; i++)
1005 msBlk->block_cache[i].block = SQUASHFS_INVALID_BLK;
1006
1007 msBlk->next_cache = 0;
1008
1009 /* Allocate read_data block */
1010 msBlk->read_size = (sBlk->block_size < SQUASHFS_METADATA_SIZE) ? SQUASHFS_METADATA_SIZE : sBlk->block_size;
1011 if(!(msBlk->read_data = (char *) kmalloc(msBlk->read_size, GFP_KERNEL))) {
1012 ERROR("Failed to allocate read_data block\n");
1013 goto failed_mount1;
1014 }
1015
1016 /* Allocate read_page block */
1017 if(sBlk->block_size > PAGE_CACHE_SIZE) {
1018 if(!(msBlk->read_page = (char *) kmalloc(sBlk->block_size, GFP_KERNEL))) {
1019 ERROR("Failed to allocate read_page block\n");
1020 goto failed_mount2;
1021 }
1022 } else
1023 msBlk->read_page = NULL;
1024
1025 /* Allocate uid and gid tables */
1026 if(!(msBlk->uid = (squashfs_uid *) kmalloc((sBlk->no_uids +
1027 sBlk->no_guids) * sizeof(squashfs_uid), GFP_KERNEL))) {
1028 ERROR("Failed to allocate uid/gid table\n");
1029 goto failed_mount3;
1030 }
1031 msBlk->guid = msBlk->uid + sBlk->no_uids;
1032
1033 if(msBlk->swap) {
1034 squashfs_uid suid[sBlk->no_uids + sBlk->no_guids];
1035
1036 if(!read_data(s, (char *) &suid, sBlk->uid_start, ((sBlk->no_uids + sBlk->no_guids) *
1037 sizeof(squashfs_uid)) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1038 SERROR("unable to read uid/gid table\n");
1039 goto failed_mount4;
1040 }
1041 SQUASHFS_SWAP_DATA(msBlk->uid, suid, (sBlk->no_uids + sBlk->no_guids), (sizeof(squashfs_uid) * 8));
1042 } else
1043 if(!read_data(s, (char *) msBlk->uid, sBlk->uid_start, ((sBlk->no_uids + sBlk->no_guids) *
1044 sizeof(squashfs_uid)) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1045 SERROR("unable to read uid/gid table\n");
1046 goto failed_mount4;
1047 }
1048
1049
1050 #ifdef SQUASHFS_1_0_COMPATIBILITY
1051 if(sBlk->s_major == 1) {
1052 msBlk->iget = squashfs_iget_1;
1053 msBlk->read_blocklist = read_blocklist_1;
1054 msBlk->fragment = NULL;
1055 msBlk->fragment_index = NULL;
1056 goto allocate_root;
1057 }
1058 #endif
1059 msBlk->iget = squashfs_iget;
1060 msBlk->read_blocklist = read_blocklist;
1061
1062 if(!(msBlk->fragment = (struct squashfs_fragment_cache *) kmalloc(sizeof(struct squashfs_fragment_cache) * SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
1063 ERROR("Failed to allocate fragment block cache\n");
1064 goto failed_mount4;
1065 }
1066
1067 for(i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
1068 msBlk->fragment[i].locked = 0;
1069 msBlk->fragment[i].block = SQUASHFS_INVALID_BLK;
1070 msBlk->fragment[i].data = NULL;
1071 }
1072
1073 msBlk->next_fragment = 0;
1074
1075 /* Allocate fragment index table */
1076 if(!(msBlk->fragment_index = (squashfs_fragment_index *) kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments), GFP_KERNEL))) {
1077 ERROR("Failed to allocate uid/gid table\n");
1078 goto failed_mount5;
1079 }
1080
1081 if(SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments) &&
1082 !read_data(s, (char *) msBlk->fragment_index, sBlk->fragment_table_start,
1083 SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1084 SERROR("unable to read fragment index table\n");
1085 goto failed_mount6;
1086 }
1087
1088 if(msBlk->swap) {
1089 int i;
1090 squashfs_fragment_index fragment;
1091
1092 for(i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sBlk->fragments); i++) {
1093 SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment), &msBlk->fragment_index[i], 1);
1094 msBlk->fragment_index[i] = fragment;
1095 }
1096 }
1097
1098 #ifdef SQUASHFS_1_0_COMPATIBILITY
1099 allocate_root:
1100 #endif
1101 if(!(s->s_root = d_alloc_root((msBlk->iget)(s, sBlk->root_inode)))) {
1102 ERROR("Root inode create failed\n");
1103 goto failed_mount5;
1104 }
1105
1106 TRACE("Leaving squashfs_read_super\n");
1107 return 0;
1108
1109 failed_mount6:
1110 kfree(msBlk->fragment_index);
1111 failed_mount5:
1112 kfree(msBlk->fragment);
1113 failed_mount4:
1114 kfree(msBlk->uid);
1115 failed_mount3:
1116 kfree(msBlk->read_page);
1117 failed_mount2:
1118 kfree(msBlk->read_data);
1119 failed_mount1:
1120 kfree(msBlk->block_cache);
1121 failed_mount:
1122 kfree(s->s_fs_info);
1123 s->s_fs_info = NULL;
1124 return -EINVAL;
1125 }
1126
1127
1128 static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1129 {
1130 struct super_block *s = dentry->d_sb;
1131 squashfs_super_block *sBlk = &((squashfs_sb_info *)s->s_fs_info)->sBlk;
1132
1133 TRACE("Entered squashfs_statfs\n");
1134 buf->f_type = SQUASHFS_MAGIC;
1135 buf->f_bsize = sBlk->block_size;
1136 buf->f_blocks = ((sBlk->bytes_used - 1) >> sBlk->block_log) + 1;
1137 buf->f_bfree = buf->f_bavail = 0;
1138 buf->f_files = sBlk->inodes;
1139 buf->f_ffree = 0;
1140 buf->f_namelen = SQUASHFS_NAME_LEN;
1141 return 0;
1142 }
1143
1144
1145 static int squashfs_symlink_readpage(struct file *file, struct page *page)
1146 {
1147 struct inode *inode = page->mapping->host;
1148 int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
1149 unsigned int block = SQUASHFS_I(inode)->start_block;
1150 int offset = SQUASHFS_I(inode)->offset;
1151 void *pageaddr = kmap(page);
1152
1153 TRACE("Entered squashfs_symlink_readpage, page index %d, start block %x, offset %x\n",
1154 page->index, SQUASHFS_I(inode)->start_block, SQUASHFS_I(inode)->offset);
1155
1156 for(length = 0; length < index; length += bytes) {
1157 if(!(bytes = squashfs_get_cached_block(inode->i_sb, NULL, block, offset,
1158 PAGE_CACHE_SIZE, &block, &offset))) {
1159 ERROR("Unable to read symbolic link [%x:%x]\n", block, offset);
1160 goto skip_read;
1161 }
1162 }
1163
1164 if(length != index) {
1165 ERROR("(squashfs_symlink_readpage) length != index\n");
1166 bytes = 0;
1167 goto skip_read;
1168 }
1169
1170 bytes = (inode->i_size - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE : inode->i_size - length;
1171 if(!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block, offset, bytes, &block, &offset)))
1172 ERROR("Unable to read symbolic link [%x:%x]\n", block, offset);
1173
1174 skip_read:
1175 memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1176 kunmap(page);
1177 flush_dcache_page(page);
1178 SetPageUptodate(page);
1179 unlock_page(page);
1180
1181 return 0;
1182 }
1183
1184
1185 #define SIZE 256
1186
1187 #ifdef SQUASHFS_1_0_COMPATIBILITY
1188 static unsigned int read_blocklist_1(struct inode *inode, int index, int readahead_blks,
1189 char *block_list, unsigned short **block_p, unsigned int *bsize)
1190 {
1191 squashfs_sb_info *msBlk = (squashfs_sb_info *)inode->i_sb->s_fs_info;
1192 unsigned short *block_listp;
1193 int i = 0;
1194 int block_ptr = SQUASHFS_I(inode)->block_list_start;
1195 int offset = SQUASHFS_I(inode)->offset;
1196 unsigned int block = SQUASHFS_I(inode)->start_block;
1197
1198 for(;;) {
1199 int blocks = (index + readahead_blks - i);
1200 if(blocks > (SIZE >> 1)) {
1201 if((index - i) <= (SIZE >> 1))
1202 blocks = index - i;
1203 else
1204 blocks = SIZE >> 1;
1205 }
1206
1207 if(msBlk->swap) {
1208 unsigned char sblock_list[SIZE];
1209 if(!squashfs_get_cached_block(inode->i_sb, (char *) sblock_list, block_ptr, offset, blocks << 1, &block_ptr, &offset)) {
1210 ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset);
1211 return 0;
1212 }
1213 SQUASHFS_SWAP_SHORTS(((unsigned short *)block_list), ((unsigned short *)sblock_list), blocks);
1214 } else
1215 if(!squashfs_get_cached_block(inode->i_sb, (char *) block_list, block_ptr, offset, blocks << 1, &block_ptr, &offset)) {
1216 ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset);
1217 return 0;
1218 }
1219 for(block_listp = (unsigned short *) block_list; i < index && blocks; i ++, block_listp ++, blocks --)
1220 block += SQUASHFS_COMPRESSED_SIZE(*block_listp);
1221 if(blocks >= readahead_blks)
1222 break;
1223 }
1224
1225 if(bsize)
1226 *bsize = SQUASHFS_COMPRESSED_SIZE(*block_listp) | (!SQUASHFS_COMPRESSED(*block_listp) ? SQUASHFS_COMPRESSED_BIT_BLOCK : 0);
1227 else
1228 *block_p = block_listp;
1229 return block;
1230 }
1231 #endif
1232
1233
1234 static unsigned int read_blocklist(struct inode *inode, int index, int readahead_blks,
1235 char *block_list, unsigned short **block_p, unsigned int *bsize)
1236 {
1237 squashfs_sb_info *msBlk = (squashfs_sb_info *)inode->i_sb->s_fs_info;
1238 unsigned int *block_listp;
1239 int i = 0;
1240 int block_ptr = SQUASHFS_I(inode)->block_list_start;
1241 int offset = SQUASHFS_I(inode)->offset;
1242 unsigned int block = SQUASHFS_I(inode)->start_block;
1243
1244 for(;;) {
1245 int blocks = (index + readahead_blks - i);
1246 if(blocks > (SIZE >> 2)) {
1247 if((index - i) <= (SIZE >> 2))
1248 blocks = index - i;
1249 else
1250 blocks = SIZE >> 2;
1251 }
1252
1253 if(msBlk->swap) {
1254 unsigned char sblock_list[SIZE];
1255 if(!squashfs_get_cached_block(inode->i_sb, (char *) sblock_list, block_ptr, offset, blocks << 2, &block_ptr, &offset)) {
1256 ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset);
1257 return 0;
1258 }
1259 SQUASHFS_SWAP_INTS(((unsigned int *)block_list), ((unsigned int *)sblock_list), blocks);
1260 } else
1261 if(!squashfs_get_cached_block(inode->i_sb, (char *) block_list, block_ptr, offset, blocks << 2, &block_ptr, &offset)) {
1262 ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset);
1263 return 0;
1264 }
1265 for(block_listp = (unsigned int *) block_list; i < index && blocks; i ++, block_listp ++, blocks --)
1266 block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
1267 if(blocks >= readahead_blks)
1268 break;
1269 }
1270
1271 *bsize = *block_listp;
1272 return block;
1273 }
1274
1275
1276 static int squashfs_readpage(struct file *file, struct page *page)
1277 {
1278 struct inode *inode = page->mapping->host;
1279 squashfs_sb_info *msBlk = (squashfs_sb_info *)inode->i_sb->s_fs_info;
1280 squashfs_super_block *sBlk = &msBlk->sBlk;
1281 unsigned char block_list[SIZE];
1282 unsigned int bsize, block, i = 0, bytes = 0, byte_offset = 0;
1283 int index = page->index >> (sBlk->block_log - PAGE_CACHE_SHIFT);
1284 void *pageaddr = kmap(page);
1285 struct squashfs_fragment_cache *fragment = NULL;
1286 char *data_ptr = msBlk->read_page;
1287
1288 int mask = (1 << (sBlk->block_log - PAGE_CACHE_SHIFT)) - 1;
1289 int start_index = page->index & ~mask;
1290 int end_index = start_index | mask;
1291
1292 TRACE("Entered squashfs_readpage, page index %x, start block %x\n", (unsigned int) page->index,
1293 SQUASHFS_I(inode)->start_block);
1294
1295 if(page->index >= ((inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)) {
1296 goto skip_read;
1297 }
1298
1299 if(SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK || index < (inode->i_size >> sBlk->block_log)) {
1300 if((block = (msBlk->read_blocklist)(inode, index, 1, block_list, NULL, &bsize)) == 0)
1301 goto skip_read;
1302
1303 down(&msBlk->read_page_mutex);
1304 if(!(bytes = read_data(inode->i_sb, msBlk->read_page, block, bsize, NULL))) {
1305 ERROR("Unable to read page, block %x, size %x\n", block, bsize);
1306 up(&msBlk->read_page_mutex);
1307 goto skip_read;
1308 }
1309 } else {
1310 if((fragment = get_cached_fragment(inode->i_sb, SQUASHFS_I(inode)->u.s1.fragment_start_block, SQUASHFS_I(inode)->u.s1.fragment_size)) == NULL) {
1311 ERROR("Unable to read page, block %x, size %x\n", SQUASHFS_I(inode)->u.s1.fragment_start_block, (int) SQUASHFS_I(inode)->u.s1.fragment_size);
1312 goto skip_read;
1313 }
1314 bytes = SQUASHFS_I(inode)->u.s1.fragment_offset + (inode->i_size & (sBlk->block_size - 1));
1315 byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
1316 data_ptr = fragment->data;
1317 }
1318
1319 for(i = start_index; i <= end_index && byte_offset < bytes; i++, byte_offset += PAGE_CACHE_SIZE) {
1320 struct page *push_page;
1321 int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE : bytes - byte_offset;
1322
1323 TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n", bytes, i, byte_offset, available_bytes);
1324
1325 if(i == page->index) {
1326 memcpy(pageaddr, data_ptr + byte_offset, available_bytes);
1327 memset(pageaddr + available_bytes, 0, PAGE_CACHE_SIZE - available_bytes);
1328 kunmap(page);
1329 flush_dcache_page(page);
1330 SetPageUptodate(page);
1331 unlock_page(page);
1332 } else if((push_page = grab_cache_page_nowait(page->mapping, i))) {
1333 void *pageaddr = kmap(push_page);
1334 memcpy(pageaddr, data_ptr + byte_offset, available_bytes);
1335 memset(pageaddr + available_bytes, 0, PAGE_CACHE_SIZE - available_bytes);
1336 kunmap(push_page);
1337 flush_dcache_page(push_page);
1338 SetPageUptodate(push_page);
1339 unlock_page(push_page);
1340 page_cache_release(push_page);
1341 }
1342 }
1343
1344 if(SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK || index < (inode->i_size >> sBlk->block_log))
1345 up(&msBlk->read_page_mutex);
1346 else
1347 release_cached_fragment(msBlk, fragment);
1348
1349 return 0;
1350
1351 skip_read:
1352 memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1353 kunmap(page);
1354 flush_dcache_page(page);
1355 SetPageUptodate(page);
1356 unlock_page(page);
1357
1358 return 0;
1359 }
1360
1361
1362 static int squashfs_readpage4K(struct file *file, struct page *page)
1363 {
1364 struct inode *inode = page->mapping->host;
1365 squashfs_sb_info *msBlk = (squashfs_sb_info *)inode->i_sb->s_fs_info;
1366 squashfs_super_block *sBlk = &msBlk->sBlk;
1367 unsigned char block_list[SIZE];
1368 unsigned int bsize, block, bytes = 0;
1369 void *pageaddr = kmap(page);
1370
1371 TRACE("Entered squashfs_readpage4K, page index %x, start block %x\n", (unsigned int) page->index,
1372 SQUASHFS_I(inode)->start_block);
1373
1374 if(page->index >= ((inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)) {
1375 goto skip_read;
1376 }
1377
1378 if(SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK || page->index < (inode->i_size >> sBlk->block_log)) {
1379 block = (msBlk->read_blocklist)(inode, page->index, 1, block_list, NULL, &bsize);
1380
1381 if(!(bytes = read_data(inode->i_sb, pageaddr, block, bsize, NULL)))
1382 ERROR("Unable to read page, block %x, size %x\n", block, bsize);
1383 } else {
1384 struct squashfs_fragment_cache *fragment;
1385
1386 if((fragment = get_cached_fragment(inode->i_sb, SQUASHFS_I(inode)->u.s1.fragment_start_block, SQUASHFS_I(inode)->u.s1.fragment_size)) == NULL)
1387 ERROR("Unable to read page, block %x, size %x\n", SQUASHFS_I(inode)->u.s1.fragment_start_block, (int) SQUASHFS_I(inode)->u.s1.fragment_size);
1388 else {
1389 bytes = inode->i_size & (sBlk->block_size - 1);
1390 memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->u.s1.fragment_offset, bytes);
1391 release_cached_fragment(msBlk, fragment);
1392 }
1393 }
1394
1395 skip_read:
1396 memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1397 kunmap(page);
1398 flush_dcache_page(page);
1399 SetPageUptodate(page);
1400 unlock_page(page);
1401
1402 return 0;
1403 }
1404
1405
1406 #ifdef SQUASHFS_1_0_COMPATIBILITY
1407 static int squashfs_readpage_lessthan4K(struct file *file, struct page *page)
1408 {
1409 struct inode *inode = page->mapping->host;
1410 squashfs_sb_info *msBlk = (squashfs_sb_info *)inode->i_sb->s_fs_info;
1411 squashfs_super_block *sBlk = &msBlk->sBlk;
1412 unsigned char block_list[SIZE];
1413 unsigned short *block_listp, block, bytes = 0;
1414 int index = page->index << (PAGE_CACHE_SHIFT - sBlk->block_log);
1415 int file_blocks = ((inode->i_size - 1) >> sBlk->block_log) + 1;
1416 int readahead_blks = 1 << (PAGE_CACHE_SHIFT - sBlk->block_log);
1417 void *pageaddr = kmap(page);
1418
1419 int i_end = index + (1 << (PAGE_CACHE_SHIFT - sBlk->block_log));
1420 int byte;
1421
1422 TRACE("Entered squashfs_readpage_lessthan4K, page index %x, start block %x\n", (unsigned int) page->index,
1423 SQUASHFS_I(inode)->start_block);
1424
1425 block = read_blocklist_1(inode, index, readahead_blks, block_list, &block_listp, NULL);
1426
1427 if(i_end > file_blocks)
1428 i_end = file_blocks;
1429
1430 while(index < i_end) {
1431 int c_byte = !SQUASHFS_COMPRESSED(*block_listp) ? SQUASHFS_COMPRESSED_SIZE(*block_listp) | SQUASHFS_COMPRESSED_BIT_BLOCK : *block_listp;
1432 if(!(byte = read_data(inode->i_sb, pageaddr, block, c_byte, NULL))) {
1433 ERROR("Unable to read page, block %x, size %x\n", block, *block_listp);
1434 goto skip_read;
1435 }
1436 block += SQUASHFS_COMPRESSED_SIZE(*block_listp);
1437 pageaddr += byte;
1438 bytes += byte;
1439 index ++;
1440 block_listp ++;
1441 }
1442
1443 skip_read:
1444 memset(pageaddr, 0, PAGE_CACHE_SIZE - bytes);
1445 kunmap(page);
1446 flush_dcache_page(page);
1447 SetPageUptodate(page);
1448 unlock_page(page);
1449
1450 return 0;
1451 }
1452 #endif
1453
1454
1455 static int get_dir_index_using_offset(struct super_block *s, unsigned int *next_block,
1456 unsigned int *next_offset, unsigned int index_start, unsigned int index_offset,
1457 int i_count, long long f_pos)
1458 {
1459 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
1460 squashfs_super_block *sBlk = &msBlk->sBlk;
1461 int i, length = 0;
1462 squashfs_dir_index index;
1463
1464 TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n", i_count, (unsigned int) f_pos);
1465
1466 if(f_pos == 0)
1467 return 0;
1468
1469 for(i = 0; i < i_count; i++) {
1470 if(msBlk->swap) {
1471 squashfs_dir_index sindex;
1472 squashfs_get_cached_block(s, (char *) &sindex, index_start, index_offset,
1473 sizeof(sindex), &index_start, &index_offset);
1474 SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
1475 } else
1476 squashfs_get_cached_block(s, (char *) &index, index_start, index_offset,
1477 sizeof(index), &index_start, &index_offset);
1478
1479 if(index.index > f_pos)
1480 break;
1481
1482 squashfs_get_cached_block(s, NULL, index_start, index_offset,
1483 index.size + 1, &index_start, &index_offset);
1484
1485 length = index.index;
1486 *next_block = index.start_block + sBlk->directory_table_start;
1487 }
1488
1489 *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1490 return length;
1491 }
1492
1493
1494 static int get_dir_index_using_name(struct super_block *s, unsigned int *next_block,
1495 unsigned int *next_offset, unsigned int index_start, unsigned int index_offset,
1496 int i_count, const char *name, int size)
1497 {
1498 squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info;
1499 squashfs_super_block *sBlk = &msBlk->sBlk;
1500 int i, length = 0;
1501 char buffer[sizeof(squashfs_dir_index) + SQUASHFS_NAME_LEN + 1];
1502 squashfs_dir_index *index = (squashfs_dir_index *) buffer;
1503 char str[SQUASHFS_NAME_LEN + 1];
1504
1505 TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
1506
1507 if (size > SQUASHFS_NAME_LEN) {
1508 ERROR("Filename length %d > SQUASHFS_NAME_LEN\n", size);
1509 size = SQUASHFS_NAME_LEN;
1510 }
1511
1512 strncpy(str, name, size);
1513 str[size] = '\0';
1514
1515 for(i = 0; i < i_count; i++) {
1516 if(msBlk->swap) {
1517 squashfs_dir_index sindex;
1518 squashfs_get_cached_block(s, (char *) &sindex, index_start, index_offset,
1519 sizeof(sindex), &index_start, &index_offset);
1520 SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
1521 } else
1522 squashfs_get_cached_block(s, (char *) index, index_start, index_offset,
1523 sizeof(squashfs_dir_index), &index_start, &index_offset);
1524
1525 squashfs_get_cached_block(s, index->name, index_start, index_offset,
1526 index->size + 1, &index_start, &index_offset);
1527
1528 index->name[index->size + 1] = '\0';
1529
1530 if(strcmp(index->name, str) > 0)
1531 break;
1532
1533 length = index->index;
1534 *next_block = index->start_block + sBlk->directory_table_start;
1535 }
1536
1537 *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1538 return length;
1539 }
1540
1541
1542 static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
1543 {
1544 struct inode *i = file->f_dentry->d_inode;
1545 squashfs_sb_info *msBlk = (squashfs_sb_info *)i->i_sb->s_fs_info;
1546 squashfs_super_block *sBlk = &msBlk->sBlk;
1547 int next_block = SQUASHFS_I(i)->start_block + sBlk->directory_table_start, next_offset =
1548 SQUASHFS_I(i)->offset, length = 0, dirs_read = 0, dir_count;
1549 squashfs_dir_header dirh;
1550 char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
1551 squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer;
1552
1553 TRACE("Entered squashfs_readdir [%x:%x]\n", next_block, next_offset);
1554
1555 lock_kernel();
1556
1557 length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, SQUASHFS_I(i)->u.s2.directory_index_start,
1558 SQUASHFS_I(i)->u.s2.directory_index_offset, SQUASHFS_I(i)->u.s2.directory_index_count, file->f_pos);
1559
1560 while(length < i->i_size) {
1561 /* read directory header */
1562 if(msBlk->swap) {
1563 squashfs_dir_header sdirh;
1564 if(!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, next_block,
1565 next_offset, sizeof(sdirh), &next_block, &next_offset))
1566 goto failed_read;
1567 length += sizeof(sdirh);
1568 SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1569 } else {
1570 if(!squashfs_get_cached_block(i->i_sb, (char *) &dirh, next_block,
1571 next_offset, sizeof(dirh), &next_block, &next_offset))
1572 goto failed_read;
1573 length += sizeof(dirh);
1574 }
1575
1576 dir_count = dirh.count + 1;
1577 while(dir_count--) {
1578 if(msBlk->swap) {
1579 squashfs_dir_entry sdire;
1580 if(!squashfs_get_cached_block(i->i_sb, (char *) &sdire, next_block,
1581 next_offset, sizeof(sdire), &next_block, &next_offset))
1582 goto failed_read;
1583 length += sizeof(sdire);
1584 SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1585 } else {
1586 if(!squashfs_get_cached_block(i->i_sb, (char *) dire, next_block,
1587 next_offset, sizeof(*dire), &next_block, &next_offset))
1588 goto failed_read;
1589 length += sizeof(*dire);
1590 }
1591
1592 if(!squashfs_get_cached_block(i->i_sb, dire->name, next_block,
1593 next_offset, dire->size + 1, &next_block, &next_offset))
1594 goto failed_read;
1595 length += dire->size + 1;
1596
1597 if(file->f_pos >= length)
1598 continue;
1599
1600 dire->name[dire->size + 1] = '\0';
1601
1602 TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n", (unsigned int) dirent,
1603 dire->name, dire->size + 1, (int) file->f_pos,
1604 dirh.start_block, dire->offset, squashfs_filetype_table[dire->type]);
1605
1606 if(filldir(dirent, dire->name, dire->size + 1, file->f_pos, SQUASHFS_MK_VFS_INODE(dirh.start_block,
1607 dire->offset), squashfs_filetype_table[dire->type]) < 0) {
1608 TRACE("Filldir returned less than 0\n");
1609 unlock_kernel();
1610 return dirs_read;
1611 }
1612
1613 file->f_pos = length;
1614 dirs_read ++;
1615 }
1616 }
1617
1618 unlock_kernel();
1619 return dirs_read;
1620
1621 failed_read:
1622 unlock_kernel();
1623 ERROR("Unable to read directory block [%x:%x]\n", next_block, next_offset);
1624 return 0;
1625 }
1626
1627
1628 static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry, struct nameidata *nd)
1629 {
1630 const unsigned char *name =dentry->d_name.name;
1631 int len = dentry->d_name.len;
1632 struct inode *inode = NULL;
1633 squashfs_sb_info *msBlk = (squashfs_sb_info *)i->i_sb->s_fs_info;
1634 squashfs_super_block *sBlk = &msBlk->sBlk;
1635 int next_block = SQUASHFS_I(i)->start_block + sBlk->directory_table_start, next_offset =
1636 SQUASHFS_I(i)->offset, length = 0, dir_count;
1637 squashfs_dir_header dirh;
1638 char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN];
1639 squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer;
1640 int squashfs_2_1 = sBlk->s_major == 2 && sBlk->s_minor == 1;
1641
1642 TRACE("Entered squashfs_lookup [%x:%x]\n", next_block, next_offset);
1643
1644 if (len > SQUASHFS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG);
1645
1646 lock_kernel();
1647
1648 length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, SQUASHFS_I(i)->u.s2.directory_index_start,
1649 SQUASHFS_I(i)->u.s2.directory_index_offset, SQUASHFS_I(i)->u.s2.directory_index_count, name, len);
1650
1651 while(length < i->i_size) {
1652 /* read directory header */
1653 if(msBlk->swap) {
1654 squashfs_dir_header sdirh;
1655 if(!squashfs_get_cached_block(i->i_sb, (char *) &sdirh, next_block, next_offset,
1656 sizeof(sdirh), &next_block, &next_offset))
1657 goto failed_read;
1658 length += sizeof(sdirh);
1659 SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1660 } else {
1661 if(!squashfs_get_cached_block(i->i_sb, (char *) &dirh, next_block, next_offset,
1662 sizeof(dirh), &next_block, &next_offset))
1663 goto failed_read;
1664 length += sizeof(dirh);
1665 }
1666
1667 dir_count = dirh.count + 1;
1668 while(dir_count--) {
1669 if(msBlk->swap) {
1670 squashfs_dir_entry sdire;
1671 if(!squashfs_get_cached_block(i->i_sb, (char *) &sdire,
1672 next_block,next_offset, sizeof(sdire), &next_block, &next_offset))
1673 goto failed_read;
1674 length += sizeof(sdire);
1675 SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1676 } else {
1677 if(!squashfs_get_cached_block(i->i_sb, (char *) dire,
1678 next_block,next_offset, sizeof(*dire), &next_block, &next_offset))
1679 goto failed_read;
1680 length += sizeof(*dire);
1681 }
1682
1683 if(!squashfs_get_cached_block(i->i_sb, dire->name,
1684 next_block, next_offset, dire->size + 1, &next_block, &next_offset))
1685 goto failed_read;
1686 length += dire->size + 1;
1687
1688 if(squashfs_2_1 && name[0] < dire->name[0])
1689 goto exit_loop;
1690
1691 if((len == dire->size + 1) && !strncmp(name, dire->name, len)) {
1692 squashfs_inode ino = SQUASHFS_MKINODE(dirh.start_block, dire->offset);
1693
1694 TRACE("calling squashfs_iget for directory entry %s, inode %x:%x\n",
1695 name, dirh.start_block, dire->offset);
1696
1697 inode = (msBlk->iget)(i->i_sb, ino);
1698
1699 goto exit_loop;
1700 }
1701 }
1702 }
1703
1704 exit_loop:
1705 d_add(dentry, inode);
1706 unlock_kernel();
1707 return ERR_PTR(0);
1708
1709 failed_read:
1710 ERROR("Unable to read directory block [%x:%x]\n", next_block, next_offset);
1711 goto exit_loop;
1712 }
1713
1714
1715 static void squashfs_put_super(struct super_block *s)
1716 {
1717 int i;
1718
1719 if(s->s_fs_info) {
1720 squashfs_sb_info *sbi = (squashfs_sb_info *) s->s_fs_info;
1721 if(sbi->block_cache) {
1722 for(i = 0; i < SQUASHFS_CACHED_BLKS; i++)
1723 if(sbi->block_cache[i].block != SQUASHFS_INVALID_BLK)
1724 kfree(sbi->block_cache[i].data);
1725 kfree(sbi->block_cache);
1726 }
1727 if(sbi->read_data) kfree(sbi->read_data);
1728 if(sbi->read_page) kfree(sbi->read_page);
1729 if(sbi->uid) kfree(sbi->uid);
1730 if(sbi->fragment) {
1731 for(i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++)
1732 if(sbi->fragment[i].data != NULL)
1733 SQUASHFS_FREE(sbi->fragment[i].data);
1734 kfree(sbi->fragment);
1735 }
1736 if(sbi->fragment_index) kfree(sbi->fragment_index);
1737 kfree(s->s_fs_info);
1738 s->s_fs_info = NULL;
1739 }
1740 }
1741
1742
1743 static int squashfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1744 {
1745 return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super, mnt);
1746 }
1747
1748
1749 static int __init init_squashfs_fs(void)
1750 {
1751 int err = init_inodecache();
1752 if(err)
1753 return err;
1754
1755 printk(KERN_INFO "Squashfs 2.2-r2 (released 2005/09/08) (C) 2002-2005 Phillip Lougher\n");
1756
1757 #ifdef CONFIG_SQUASHFS_LZMA
1758 printk(KERN_INFO "Squashfs 2.2 includes LZMA decompression support\n");
1759 if(!(lzma_data = (char *) vmalloc(lzma_workspace_size()))) {
1760 ERROR("Failed to allocate lzma workspace\n");
1761 return -ENOMEM;
1762 }
1763 lzma_init(lzma_data, lzma_workspace_size());
1764 #else
1765 if(!(stream.workspace = (char *) vmalloc(zlib_inflate_workspacesize()))) {
1766 ERROR("Failed to allocate zlib workspace\n");
1767 destroy_inodecache();
1768 return -ENOMEM;
1769 }
1770 #endif
1771
1772 if((err = register_filesystem(&squashfs_fs_type))) {
1773 #ifndef CONFIG_SQUASHFS_LZMA
1774 vfree(stream.workspace);
1775 #endif
1776 destroy_inodecache();
1777 }
1778
1779 return err;
1780 }
1781
1782
1783 static void __exit exit_squashfs_fs(void)
1784 {
1785 #ifdef CONFIG_SQUASHFS_LZMA
1786 vfree(lzma_data);
1787 #else
1788 vfree(stream.workspace);
1789 #endif
1790 unregister_filesystem(&squashfs_fs_type);
1791 destroy_inodecache();
1792 }
1793
1794
1795 static kmem_cache_t * squashfs_inode_cachep;
1796
1797
1798 static struct inode *squashfs_alloc_inode(struct super_block *sb)
1799 {
1800 struct squashfs_inode_info *ei;
1801 ei = (struct squashfs_inode_info *)kmem_cache_alloc(squashfs_inode_cachep, SLAB_KERNEL);
1802 if (!ei)
1803 return NULL;
1804 return &ei->vfs_inode;
1805 }
1806
1807
1808 static void squashfs_destroy_inode(struct inode *inode)
1809 {
1810 kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode));
1811 }
1812
1813
1814 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
1815 {
1816 struct squashfs_inode_info *ei = (struct squashfs_inode_info *) foo;
1817
1818 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1819 SLAB_CTOR_CONSTRUCTOR)
1820 inode_init_once(&ei->vfs_inode);
1821 }
1822
1823
1824 static int init_inodecache(void)
1825 {
1826 squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
1827 sizeof(struct squashfs_inode_info),
1828 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
1829 init_once, NULL);
1830 if (squashfs_inode_cachep == NULL)
1831 return -ENOMEM;
1832 return 0;
1833 }
1834
1835
1836 static void destroy_inodecache(void)
1837 {
1838 kmem_cache_destroy(squashfs_inode_cachep);
1839 }
1840
1841
1842 module_init(init_squashfs_fs);
1843 module_exit(exit_squashfs_fs);
1844 MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
1845 MODULE_AUTHOR("Phillip Lougher <phillip@lougher.demon.co.uk>");
1846 MODULE_LICENSE("GPL");
MOXA 2.6.19 from UC-7110-LX-BOOTLOADER-1.9_VERSION-4.2.tgz