target/linux/generic-2.4/patches/001-squashfs.patch

   1 Index: linux-2.4.35.4/fs/Config.in
   2 ===================================================================
   3 --- linux-2.4.35.4.orig/fs/Config.in    2007-12-15 05:19:42.758857728 +0100
   4 +++ linux-2.4.35.4/fs/Config.in 2007-12-15 05:19:48.635192599 +0100
   5 @@ -51,6 +51,14 @@
   6     int 'JFFS2 debugging verbosity (0 = quiet, 2 = noisy)' CONFIG_JFFS2_FS_DEBUG 0
   7  fi
   8  tristate 'Compressed ROM file system support' CONFIG_CRAMFS
   9 +tristate 'Squashed file system support' CONFIG_SQUASHFS
  10 +if [ "$CONFIG_SQUASHFS" = "y" -o "$CONFIG_SQUASHFS" = "m" ] ; then
  11 +bool 'Additional options for memory constrained systems ' CONFIG_SQUASHFS_EMBEDDED
  12 +fi
  13 +if [ "$CONFIG_SQUASHFS_EMBEDDED" = "y" ] ; then
  14 +int 'Number of fragments cached' CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE 3
  15 +bool 'Use Vmalloc rather than Kmalloc'  CONFIG_SQUASHFS_VMALLOC
  16 +fi
  17  bool 'Virtual memory file system support (former shm fs)' CONFIG_TMPFS
  18  define_bool CONFIG_RAMFS y
  19
  20 Index: linux-2.4.35.4/fs/Makefile
  21 ===================================================================
  22 --- linux-2.4.35.4.orig/fs/Makefile     2007-12-15 05:19:42.766858183 +0100
  23 +++ linux-2.4.35.4/fs/Makefile  2007-12-15 05:19:48.639192828 +0100
  24 @@ -65,6 +65,7 @@
  25  subdir-$(CONFIG_DEVPTS_FS)     += devpts
  26  subdir-$(CONFIG_SUN_OPENPROMFS)        += openpromfs
  27  subdir-$(CONFIG_BEFS_FS)       += befs
  28 +subdir-$(CONFIG_SQUASHFS)      += squashfs
  29  subdir-$(CONFIG_JFS_FS)                += jfs
  30  subdir-$(CONFIG_XFS_FS)                += xfs
  31
  32 Index: linux-2.4.35.4/fs/squashfs/inode.c
  33 ===================================================================
  34 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  35 +++ linux-2.4.35.4/fs/squashfs/inode.c  2007-12-15 05:19:48.647193283 +0100
  36 @@ -0,0 +1,2028 @@
  37 +/*
  38 + * Squashfs - a compressed read only filesystem for Linux
  39 + *
  40 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
  41 + * Phillip Lougher <phillip@lougher.org.uk>
  42 + *
  43 + * This program is free software; you can redistribute it and/or
  44 + * modify it under the terms of the GNU General Public License
  45 + * as published by the Free Software Foundation; either version 2,
  46 + * or (at your option) any later version.
  47 + *
  48 + * This program is distributed in the hope that it will be useful,
  49 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  50 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  51 + * GNU General Public License for more details.
  52 + *
  53 + * You should have received a copy of the GNU General Public License
  54 + * along with this program; if not, write to the Free Software
  55 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  56 + *
  57 + * inode.c
  58 + */
  59 +
  60 +#include <linux/types.h>
  61 +#include <linux/squashfs_fs.h>
  62 +#include <linux/module.h>
  63 +#include <linux/errno.h>
  64 +#include <linux/slab.h>
  65 +#include <linux/fs.h>
  66 +#include <linux/smp_lock.h>
  67 +#include <linux/locks.h>
  68 +#include <linux/init.h>
  69 +#include <linux/dcache.h>
  70 +#include <linux/wait.h>
  71 +#include <linux/zlib.h>
  72 +#include <linux/blkdev.h>
  73 +#include <linux/vmalloc.h>
  74 +#include <asm/uaccess.h>
  75 +#include <asm/semaphore.h>
  76 +
  77 +#include "squashfs.h"
  78 +
  79 +static struct super_block *squashfs_read_super(struct super_block *, void *, int);
  80 +static void squashfs_put_super(struct super_block *);
  81 +static int squashfs_statfs(struct super_block *, struct statfs *);
  82 +static int squashfs_symlink_readpage(struct file *file, struct page *page);
  83 +static int squashfs_readpage(struct file *file, struct page *page);
  84 +static int squashfs_readpage4K(struct file *file, struct page *page);
  85 +static int squashfs_readdir(struct file *, void *, filldir_t);
  86 +static struct dentry *squashfs_lookup(struct inode *, struct dentry *);
  87 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode);
  88 +static long long read_blocklist(struct inode *inode, int index,
  89 +                               int readahead_blks, char *block_list,
  90 +                               unsigned short **block_p, unsigned int *bsize);
  91 +
  92 +static z_stream stream;
  93 +
  94 +static DECLARE_FSTYPE_DEV(squashfs_fs_type, "squashfs", squashfs_read_super);
  95 +
  96 +static unsigned char squashfs_filetype_table[] = {
  97 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
  98 +};
  99 +
 100 +static struct super_operations squashfs_ops = {
 101 +       .statfs = squashfs_statfs,
 102 +       .put_super = squashfs_put_super,
 103 +};
 104 +
 105 +SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = {
 106 +       .readpage = squashfs_symlink_readpage
 107 +};
 108 +
 109 +SQSH_EXTERN struct address_space_operations squashfs_aops = {
 110 +       .readpage = squashfs_readpage
 111 +};
 112 +
 113 +SQSH_EXTERN struct address_space_operations squashfs_aops_4K = {
 114 +       .readpage = squashfs_readpage4K
 115 +};
 116 +
 117 +static struct file_operations squashfs_dir_ops = {
 118 +       .read = generic_read_dir,
 119 +       .readdir = squashfs_readdir
 120 +};
 121 +
 122 +static struct inode_operations squashfs_dir_inode_ops = {
 123 +       .lookup = squashfs_lookup
 124 +};
 125 +
 126 +static struct buffer_head *get_block_length(struct super_block *s,
 127 +                               int *cur_index, int *offset, int *c_byte)
 128 +{
 129 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 130 +       unsigned short temp;
 131 +       struct buffer_head *bh;
 132 +
 133 +       if (!(bh = sb_bread(s, *cur_index)))
 134 +               goto out;
 135 +
 136 +       if (msblk->devblksize - *offset == 1) {
 137 +               if (msblk->swap)
 138 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 139 +                               (bh->b_data + *offset));
 140 +               else
 141 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 142 +                               (bh->b_data + *offset));
 143 +               brelse(bh);
 144 +               if (!(bh = sb_bread(s, ++(*cur_index))))
 145 +                       goto out;
 146 +               if (msblk->swap)
 147 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 148 +                               bh->b_data);
 149 +               else
 150 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 151 +                               bh->b_data);
 152 +               *c_byte = temp;
 153 +               *offset = 1;
 154 +       } else {
 155 +               if (msblk->swap) {
 156 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 157 +                               (bh->b_data + *offset));
 158 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 159 +                               (bh->b_data + *offset + 1));
 160 +               } else {
 161 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 162 +                               (bh->b_data + *offset));
 163 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 164 +                               (bh->b_data + *offset + 1));
 165 +               }
 166 +               *c_byte = temp;
 167 +               *offset += 2;
 168 +       }
 169 +
 170 +       if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) {
 171 +               if (*offset == msblk->devblksize) {
 172 +                       brelse(bh);
 173 +                       if (!(bh = sb_bread(s, ++(*cur_index))))
 174 +                               goto out;
 175 +                       *offset = 0;
 176 +               }
 177 +               if (*((unsigned char *) (bh->b_data + *offset)) !=
 178 +                                               SQUASHFS_MARKER_BYTE) {
 179 +                       ERROR("Metadata block marker corrupt @ %x\n",
 180 +                                               *cur_index);
 181 +                       brelse(bh);
 182 +                       goto out;
 183 +               }
 184 +               (*offset)++;
 185 +       }
 186 +       return bh;
 187 +
 188 +out:
 189 +       return NULL;
 190 +}
 191 +
 192 +
 193 +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer,
 194 +                       long long index, unsigned int length,
 195 +                       long long *next_index)
 196 +{
 197 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 198 +       struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
 199 +                       msblk->devblksize_log2) + 2];
 200 +       unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
 201 +       unsigned int cur_index = index >> msblk->devblksize_log2;
 202 +       int bytes, avail_bytes, b = 0, k;
 203 +       char *c_buffer;
 204 +       unsigned int compressed;
 205 +       unsigned int c_byte = length;
 206 +
 207 +       if (c_byte) {
 208 +               bytes = msblk->devblksize - offset;
 209 +               compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
 210 +               c_buffer = compressed ? msblk->read_data : buffer;
 211 +               c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
 212 +
 213 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 214 +                                       ? "" : "un", (unsigned int) c_byte);
 215 +
 216 +               if (!(bh[0] = sb_getblk(s, cur_index)))
 217 +                       goto block_release;
 218 +
 219 +               for (b = 1; bytes < c_byte; b++) {
 220 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 221 +                               goto block_release;
 222 +                       bytes += msblk->devblksize;
 223 +               }
 224 +               ll_rw_block(READ, b, bh);
 225 +       } else {
 226 +               if (!(bh[0] = get_block_length(s, &cur_index, &offset,
 227 +                                                               &c_byte)))
 228 +                       goto read_failure;
 229 +
 230 +               bytes = msblk->devblksize - offset;
 231 +               compressed = SQUASHFS_COMPRESSED(c_byte);
 232 +               c_buffer = compressed ? msblk->read_data : buffer;
 233 +               c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
 234 +
 235 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 236 +                                       ? "" : "un", (unsigned int) c_byte);
 237 +
 238 +               for (b = 1; bytes < c_byte; b++) {
 239 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 240 +                               goto block_release;
 241 +                       bytes += msblk->devblksize;
 242 +               }
 243 +               ll_rw_block(READ, b - 1, bh + 1);
 244 +       }
 245 +
 246 +       if (compressed)
 247 +               down(&msblk->read_data_mutex);
 248 +
 249 +       for (bytes = 0, k = 0; k < b; k++) {
 250 +               avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
 251 +                                       msblk->devblksize - offset :
 252 +                                       c_byte - bytes;
 253 +               wait_on_buffer(bh[k]);
 254 +               if (!buffer_uptodate(bh[k]))
 255 +                       goto block_release;
 256 +               memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
 257 +               bytes += avail_bytes;
 258 +               offset = 0;
 259 +               brelse(bh[k]);
 260 +       }
 261 +
 262 +       /*
 263 +        * uncompress block
 264 +        */
 265 +       if (compressed) {
 266 +               int zlib_err;
 267 +
 268 +               stream.next_in = c_buffer;
 269 +               stream.avail_in = c_byte;
 270 +               stream.next_out = buffer;
 271 +               stream.avail_out = msblk->read_size;
 272 +
 273 +               if (((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
 274 +                               ((zlib_err = zlib_inflate(&stream, Z_FINISH))
 275 +                                != Z_STREAM_END) || ((zlib_err =
 276 +                               zlib_inflateEnd(&stream)) != Z_OK)) {
 277 +                       ERROR("zlib_fs returned unexpected result 0x%x\n",
 278 +                               zlib_err);
 279 +                       bytes = 0;
 280 +               } else
 281 +                       bytes = stream.total_out;
 282 +
 283 +               up(&msblk->read_data_mutex);
 284 +       }
 285 +
 286 +       if (next_index)
 287 +               *next_index = index + c_byte + (length ? 0 :
 288 +                               (SQUASHFS_CHECK_DATA(msblk->sblk.flags)
 289 +                                ? 3 : 2));
 290 +       return bytes;
 291 +
 292 +block_release:
 293 +       while (--b >= 0)
 294 +               brelse(bh[b]);
 295 +
 296 +read_failure:
 297 +       ERROR("sb_bread failed reading block 0x%x\n", cur_index);
 298 +       return 0;
 299 +}
 300 +
 301 +
 302 +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
 303 +                               long long block, unsigned int offset,
 304 +                               int length, long long *next_block,
 305 +                               unsigned int *next_offset)
 306 +{
 307 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 308 +       int n, i, bytes, return_length = length;
 309 +       long long next_index;
 310 +
 311 +       TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
 312 +
 313 +       while ( 1 ) {
 314 +               for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
 315 +                       if (msblk->block_cache[i].block == block)
 316 +                               break;
 317 +
 318 +               down(&msblk->block_cache_mutex);
 319 +
 320 +               if (i == SQUASHFS_CACHED_BLKS) {
 321 +                       /* read inode header block */
 322 +                       for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS;
 323 +                                       n ; n --, i = (i + 1) %
 324 +                                       SQUASHFS_CACHED_BLKS)
 325 +                               if (msblk->block_cache[i].block !=
 326 +                                                       SQUASHFS_USED_BLK)
 327 +                                       break;
 328 +
 329 +                       if (n == 0) {
 330 +                               wait_queue_t wait;
 331 +
 332 +                               init_waitqueue_entry(&wait, current);
 333 +                               add_wait_queue(&msblk->waitq, &wait);
 334 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 335 +                               up(&msblk->block_cache_mutex);
 336 +                               schedule();
 337 +                               set_current_state(TASK_RUNNING);
 338 +                               remove_wait_queue(&msblk->waitq, &wait);
 339 +                               continue;
 340 +                       }
 341 +                       msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
 342 +
 343 +                       if (msblk->block_cache[i].block ==
 344 +                                                       SQUASHFS_INVALID_BLK) {
 345 +                               if (!(msblk->block_cache[i].data =
 346 +                                               kmalloc(SQUASHFS_METADATA_SIZE,
 347 +                                               GFP_KERNEL))) {
 348 +                                       ERROR("Failed to allocate cache"
 349 +                                                       "block\n");
 350 +                                       up(&msblk->block_cache_mutex);
 351 +                                       goto out;
 352 +                               }
 353 +                       }
 354 +
 355 +                       msblk->block_cache[i].block = SQUASHFS_USED_BLK;
 356 +                       up(&msblk->block_cache_mutex);
 357 +
 358 +                       if (!(msblk->block_cache[i].length =
 359 +                                               squashfs_read_data(s,
 360 +                                               msblk->block_cache[i].data,
 361 +                                               block, 0, &next_index))) {
 362 +                               ERROR("Unable to read cache block [%llx:%x]\n",
 363 +                                               block, offset);
 364 +                               goto out;
 365 +                       }
 366 +
 367 +                       down(&msblk->block_cache_mutex);
 368 +                       wake_up(&msblk->waitq);
 369 +                       msblk->block_cache[i].block = block;
 370 +                       msblk->block_cache[i].next_index = next_index;
 371 +                       TRACE("Read cache block [%llx:%x]\n", block, offset);
 372 +               }
 373 +
 374 +               if (msblk->block_cache[i].block != block) {
 375 +                       up(&msblk->block_cache_mutex);
 376 +                       continue;
 377 +               }
 378 +
 379 +               if ((bytes = msblk->block_cache[i].length - offset) >= length) {
 380 +                       if (buffer)
 381 +                               memcpy(buffer, msblk->block_cache[i].data +
 382 +                                               offset, length);
 383 +                       if (msblk->block_cache[i].length - offset == length) {
 384 +                               *next_block = msblk->block_cache[i].next_index;
 385 +                               *next_offset = 0;
 386 +                       } else {
 387 +                               *next_block = block;
 388 +                               *next_offset = offset + length;
 389 +                       }
 390 +                       up(&msblk->block_cache_mutex);
 391 +                       goto finish;
 392 +               } else {
 393 +                       if (buffer) {
 394 +                               memcpy(buffer, msblk->block_cache[i].data +
 395 +                                               offset, bytes);
 396 +                               buffer += bytes;
 397 +                       }
 398 +                       block = msblk->block_cache[i].next_index;
 399 +                       up(&msblk->block_cache_mutex);
 400 +                       length -= bytes;
 401 +                       offset = 0;
 402 +               }
 403 +       }
 404 +
 405 +finish:
 406 +       return return_length;
 407 +out:
 408 +       return 0;
 409 +}
 410 +
 411 +
 412 +static int get_fragment_location(struct super_block *s, unsigned int fragment,
 413 +                               long long *fragment_start_block,
 414 +                               unsigned int *fragment_size)
 415 +{
 416 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 417 +       long long start_block =
 418 +               msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
 419 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
 420 +       struct squashfs_fragment_entry fragment_entry;
 421 +
 422 +       if (msblk->swap) {
 423 +               struct squashfs_fragment_entry sfragment_entry;
 424 +
 425 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
 426 +                                       start_block, offset,
 427 +                                       sizeof(sfragment_entry), &start_block,
 428 +                                       &offset))
 429 +                       goto out;
 430 +               SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
 431 +       } else
 432 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
 433 +                                       start_block, offset,
 434 +                                       sizeof(fragment_entry), &start_block,
 435 +                                       &offset))
 436 +                       goto out;
 437 +
 438 +       *fragment_start_block = fragment_entry.start_block;
 439 +       *fragment_size = fragment_entry.size;
 440 +
 441 +       return 1;
 442 +
 443 +out:
 444 +       return 0;
 445 +}
 446 +
 447 +
 448 +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
 449 +                                       squashfs_fragment_cache *fragment)
 450 +{
 451 +       down(&msblk->fragment_mutex);
 452 +       fragment->locked --;
 453 +       wake_up(&msblk->fragment_wait_queue);
 454 +       up(&msblk->fragment_mutex);
 455 +}
 456 +
 457 +
 458 +SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
 459 +                                       *s, long long start_block,
 460 +                                       int length)
 461 +{
 462 +       int i, n;
 463 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 464 +
 465 +       while ( 1 ) {
 466 +               down(&msblk->fragment_mutex);
 467 +
 468 +               for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
 469 +                               msblk->fragment[i].block != start_block; i++);
 470 +
 471 +               if (i == SQUASHFS_CACHED_FRAGMENTS) {
 472 +                       for (i = msblk->next_fragment, n =
 473 +                               SQUASHFS_CACHED_FRAGMENTS; n &&
 474 +                               msblk->fragment[i].locked; n--, i = (i + 1) %
 475 +                               SQUASHFS_CACHED_FRAGMENTS);
 476 +
 477 +                       if (n == 0) {
 478 +                               wait_queue_t wait;
 479 +
 480 +                               init_waitqueue_entry(&wait, current);
 481 +                               add_wait_queue(&msblk->fragment_wait_queue,
 482 +                                                                       &wait);
 483 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 484 +                               up(&msblk->fragment_mutex);
 485 +                               schedule();
 486 +                               set_current_state(TASK_RUNNING);
 487 +                               remove_wait_queue(&msblk->fragment_wait_queue,
 488 +                                                                       &wait);
 489 +                               continue;
 490 +                       }
 491 +                       msblk->next_fragment = (msblk->next_fragment + 1) %
 492 +                               SQUASHFS_CACHED_FRAGMENTS;
 493 +
 494 +                       if (msblk->fragment[i].data == NULL)
 495 +                               if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
 496 +                                               (SQUASHFS_FILE_MAX_SIZE))) {
 497 +                                       ERROR("Failed to allocate fragment "
 498 +                                                       "cache block\n");
 499 +                                       up(&msblk->fragment_mutex);
 500 +                                       goto out;
 501 +                               }
 502 +
 503 +                       msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
 504 +                       msblk->fragment[i].locked = 1;
 505 +                       up(&msblk->fragment_mutex);
 506 +
 507 +                       if (!(msblk->fragment[i].length = squashfs_read_data(s,
 508 +                                               msblk->fragment[i].data,
 509 +                                               start_block, length, NULL))) {
 510 +                               ERROR("Unable to read fragment cache block "
 511 +                                                       "[%llx]\n", start_block);
 512 +                               msblk->fragment[i].locked = 0;
 513 +                               goto out;
 514 +                       }
 515 +
 516 +                       msblk->fragment[i].block = start_block;
 517 +                       TRACE("New fragment %d, start block %lld, locked %d\n",
 518 +                                               i, msblk->fragment[i].block,
 519 +                                               msblk->fragment[i].locked);
 520 +                       break;
 521 +               }
 522 +
 523 +               msblk->fragment[i].locked++;
 524 +               up(&msblk->fragment_mutex);
 525 +               TRACE("Got fragment %d, start block %lld, locked %d\n", i,
 526 +                                               msblk->fragment[i].block,
 527 +                                               msblk->fragment[i].locked);
 528 +               break;
 529 +       }
 530 +
 531 +       return &msblk->fragment[i];
 532 +
 533 +out:
 534 +       return NULL;
 535 +}
 536 +
 537 +
 538 +static struct inode *squashfs_new_inode(struct super_block *s,
 539 +               struct squashfs_base_inode_header *inodeb)
 540 +{
 541 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 542 +       struct inode *i = new_inode(s);
 543 +
 544 +       if (i) {
 545 +               i->i_ino = inodeb->inode_number;
 546 +               i->i_mtime = inodeb->mtime;
 547 +               i->i_atime = inodeb->mtime;
 548 +               i->i_ctime = inodeb->mtime;
 549 +               i->i_uid = msblk->uid[inodeb->uid];
 550 +               i->i_mode = inodeb->mode;
 551 +               i->i_size = 0;
 552 +               if (inodeb->guid == SQUASHFS_GUIDS)
 553 +                       i->i_gid = i->i_uid;
 554 +               else
 555 +                       i->i_gid = msblk->guid[inodeb->guid];
 556 +       }
 557 +
 558 +       return i;
 559 +}
 560 +
 561 +
 562 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode)
 563 +{
 564 +       struct inode *i;
 565 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 566 +       struct squashfs_super_block *sblk = &msblk->sblk;
 567 +       long long block = SQUASHFS_INODE_BLK(inode) +
 568 +               sblk->inode_table_start;
 569 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
 570 +       long long next_block;
 571 +       unsigned int next_offset;
 572 +       union squashfs_inode_header id, sid;
 573 +       struct squashfs_base_inode_header *inodeb = &id.base,
 574 +                                         *sinodeb = &sid.base;
 575 +
 576 +       TRACE("Entered squashfs_iget\n");
 577 +
 578 +       if (msblk->swap) {
 579 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
 580 +                                       offset, sizeof(*sinodeb), &next_block,
 581 +                                       &next_offset))
 582 +                       goto failed_read;
 583 +               SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb,
 584 +                                       sizeof(*sinodeb));
 585 +       } else
 586 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
 587 +                                       offset, sizeof(*inodeb), &next_block,
 588 +                                       &next_offset))
 589 +                       goto failed_read;
 590 +
 591 +       switch(inodeb->inode_type) {
 592 +               case SQUASHFS_FILE_TYPE: {
 593 +                       unsigned int frag_size;
 594 +                       long long frag_blk;
 595 +                       struct squashfs_reg_inode_header *inodep = &id.reg;
 596 +                       struct squashfs_reg_inode_header *sinodep = &sid.reg;
 597 +
 598 +                       if (msblk->swap) {
 599 +                               if (!squashfs_get_cached_block(s, (char *)
 600 +                                               sinodep, block, offset,
 601 +                                               sizeof(*sinodep), &next_block,
 602 +                                               &next_offset))
 603 +                                       goto failed_read;
 604 +                               SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep);
 605 +                       } else
 606 +                               if (!squashfs_get_cached_block(s, (char *)
 607 +                                               inodep, block, offset,
 608 +                                               sizeof(*inodep), &next_block,
 609 +                                               &next_offset))
 610 +                                       goto failed_read;
 611 +
 612 +                       frag_blk = SQUASHFS_INVALID_BLK;
 613 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 614 +                                       !get_fragment_location(s,
 615 +                                       inodep->fragment, &frag_blk, &frag_size))
 616 +                               goto failed_read;
 617 +
 618 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 619 +                               goto failed_read1;
 620 +
 621 +                       i->i_nlink = 1;
 622 +                       i->i_size = inodep->file_size;
 623 +                       i->i_fop = &generic_ro_fops;
 624 +                       i->i_mode |= S_IFREG;
 625 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 626 +                       i->i_blksize = PAGE_CACHE_SIZE;
 627 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 628 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 629 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 630 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 631 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 632 +                       SQUASHFS_I(i)->offset = next_offset;
 633 +                       if (sblk->block_size > 4096)
 634 +                               i->i_data.a_ops = &squashfs_aops;
 635 +                       else
 636 +                               i->i_data.a_ops = &squashfs_aops_4K;
 637 +
 638 +                       TRACE("File inode %x:%x, start_block %llx, "
 639 +                                       "block_list_start %llx, offset %x\n",
 640 +                                       SQUASHFS_INODE_BLK(inode), offset,
 641 +                                       inodep->start_block, next_block,
 642 +                                       next_offset);
 643 +                       break;
 644 +               }
 645 +               case SQUASHFS_LREG_TYPE: {
 646 +                       unsigned int frag_size;
 647 +                       long long frag_blk;
 648 +                       struct squashfs_lreg_inode_header *inodep = &id.lreg;
 649 +                       struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
 650 +
 651 +                       if (msblk->swap) {
 652 +                               if (!squashfs_get_cached_block(s, (char *)
 653 +                                               sinodep, block, offset,
 654 +                                               sizeof(*sinodep), &next_block,
 655 +                                               &next_offset))
 656 +                                       goto failed_read;
 657 +                               SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
 658 +                       } else
 659 +                               if (!squashfs_get_cached_block(s, (char *)
 660 +                                               inodep, block, offset,
 661 +                                               sizeof(*inodep), &next_block,
 662 +                                               &next_offset))
 663 +                                       goto failed_read;
 664 +
 665 +                       frag_blk = SQUASHFS_INVALID_BLK;
 666 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 667 +                                       !get_fragment_location(s,
 668 +                                       inodep->fragment, &frag_blk, &frag_size))
 669 +                               goto failed_read;
 670 +
 671 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 672 +                               goto failed_read1;
 673 +
 674 +                       i->i_nlink = inodep->nlink;
 675 +                       i->i_size = inodep->file_size;
 676 +                       i->i_fop = &generic_ro_fops;
 677 +                       i->i_mode |= S_IFREG;
 678 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 679 +                       i->i_blksize = PAGE_CACHE_SIZE;
 680 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 681 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 682 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 683 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 684 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 685 +                       SQUASHFS_I(i)->offset = next_offset;
 686 +                       if (sblk->block_size > 4096)
 687 +                               i->i_data.a_ops = &squashfs_aops;
 688 +                       else
 689 +                               i->i_data.a_ops = &squashfs_aops_4K;
 690 +
 691 +                       TRACE("File inode %x:%x, start_block %llx, "
 692 +                                       "block_list_start %llx, offset %x\n",
 693 +                                       SQUASHFS_INODE_BLK(inode), offset,
 694 +                                       inodep->start_block, next_block,
 695 +                                       next_offset);
 696 +                       break;
 697 +               }
 698 +               case SQUASHFS_DIR_TYPE: {
 699 +                       struct squashfs_dir_inode_header *inodep = &id.dir;
 700 +                       struct squashfs_dir_inode_header *sinodep = &sid.dir;
 701 +
 702 +                       if (msblk->swap) {
 703 +                               if (!squashfs_get_cached_block(s, (char *)
 704 +                                               sinodep, block, offset,
 705 +                                               sizeof(*sinodep), &next_block,
 706 +                                               &next_offset))
 707 +                                       goto failed_read;
 708 +                               SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep);
 709 +                       } else
 710 +                               if (!squashfs_get_cached_block(s, (char *)
 711 +                                               inodep, block, offset,
 712 +                                               sizeof(*inodep), &next_block,
 713 +                                               &next_offset))
 714 +                                       goto failed_read;
 715 +
 716 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 717 +                               goto failed_read1;
 718 +
 719 +                       i->i_nlink = inodep->nlink;
 720 +                       i->i_size = inodep->file_size;
 721 +                       i->i_op = &squashfs_dir_inode_ops;
 722 +                       i->i_fop = &squashfs_dir_ops;
 723 +                       i->i_mode |= S_IFDIR;
 724 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 725 +                       SQUASHFS_I(i)->offset = inodep->offset;
 726 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
 727 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 728 +
 729 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
 730 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
 731 +                                       offset, inodep->start_block,
 732 +                                       inodep->offset);
 733 +                       break;
 734 +               }
 735 +               case SQUASHFS_LDIR_TYPE: {
 736 +                       struct squashfs_ldir_inode_header *inodep = &id.ldir;
 737 +                       struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
 738 +
 739 +                       if (msblk->swap) {
 740 +                               if (!squashfs_get_cached_block(s, (char *)
 741 +                                               sinodep, block, offset,
 742 +                                               sizeof(*sinodep), &next_block,
 743 +                                               &next_offset))
 744 +                                       goto failed_read;
 745 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep,
 746 +                                               sinodep);
 747 +                       } else
 748 +                               if (!squashfs_get_cached_block(s, (char *)
 749 +                                               inodep, block, offset,
 750 +                                               sizeof(*inodep), &next_block,
 751 +                                               &next_offset))
 752 +                                       goto failed_read;
 753 +
 754 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 755 +                               goto failed_read1;
 756 +
 757 +                       i->i_nlink = inodep->nlink;
 758 +                       i->i_size = inodep->file_size;
 759 +                       i->i_op = &squashfs_dir_inode_ops;
 760 +                       i->i_fop = &squashfs_dir_ops;
 761 +                       i->i_mode |= S_IFDIR;
 762 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 763 +                       SQUASHFS_I(i)->offset = inodep->offset;
 764 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
 765 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
 766 +                                                               next_offset;
 767 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
 768 +                                                               inodep->i_count;
 769 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 770 +
 771 +                       TRACE("Long directory inode %x:%x, start_block %x, "
 772 +                                       "offset %x\n",
 773 +                                       SQUASHFS_INODE_BLK(inode), offset,
 774 +                                       inodep->start_block, inodep->offset);
 775 +                       break;
 776 +               }
 777 +               case SQUASHFS_SYMLINK_TYPE: {
 778 +                       struct squashfs_symlink_inode_header *inodep =
 779 +                                                               &id.symlink;
 780 +                       struct squashfs_symlink_inode_header *sinodep =
 781 +                                                               &sid.symlink;
 782 +
 783 +                       if (msblk->swap) {
 784 +                               if (!squashfs_get_cached_block(s, (char *)
 785 +                                               sinodep, block, offset,
 786 +                                               sizeof(*sinodep), &next_block,
 787 +                                               &next_offset))
 788 +                                       goto failed_read;
 789 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep,
 790 +                                                               sinodep);
 791 +                       } else
 792 +                               if (!squashfs_get_cached_block(s, (char *)
 793 +                                               inodep, block, offset,
 794 +                                               sizeof(*inodep), &next_block,
 795 +                                               &next_offset))
 796 +                                       goto failed_read;
 797 +
 798 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 799 +                               goto failed_read1;
 800 +
 801 +                       i->i_nlink = inodep->nlink;
 802 +                       i->i_size = inodep->symlink_size;
 803 +                       i->i_op = &page_symlink_inode_operations;
 804 +                       i->i_data.a_ops = &squashfs_symlink_aops;
 805 +                       i->i_mode |= S_IFLNK;
 806 +                       SQUASHFS_I(i)->start_block = next_block;
 807 +                       SQUASHFS_I(i)->offset = next_offset;
 808 +
 809 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
 810 +                                       "offset %x\n",
 811 +                                       SQUASHFS_INODE_BLK(inode), offset,
 812 +                                       next_block, next_offset);
 813 +                       break;
 814 +                }
 815 +                case SQUASHFS_BLKDEV_TYPE:
 816 +                case SQUASHFS_CHRDEV_TYPE: {
 817 +                       struct squashfs_dev_inode_header *inodep = &id.dev;
 818 +                       struct squashfs_dev_inode_header *sinodep = &sid.dev;
 819 +
 820 +                       if (msblk->swap) {
 821 +                               if (!squashfs_get_cached_block(s, (char *)
 822 +                                               sinodep, block, offset,
 823 +                                               sizeof(*sinodep), &next_block,
 824 +                                               &next_offset))
 825 +                                       goto failed_read;
 826 +                               SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep);
 827 +                       } else
 828 +                               if (!squashfs_get_cached_block(s, (char *)
 829 +                                               inodep, block, offset,
 830 +                                               sizeof(*inodep), &next_block,
 831 +                                               &next_offset))
 832 +                                       goto failed_read;
 833 +
 834 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 835 +                               goto failed_read1;
 836 +
 837 +                       i->i_nlink = inodep->nlink;
 838 +                       i->i_mode |= (inodeb->inode_type ==
 839 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
 840 +                                       S_IFBLK;
 841 +                       init_special_inode(i, i->i_mode, inodep->rdev);
 842 +
 843 +                       TRACE("Device inode %x:%x, rdev %x\n",
 844 +                                       SQUASHFS_INODE_BLK(inode), offset,
 845 +                                       inodep->rdev);
 846 +                       break;
 847 +                }
 848 +                case SQUASHFS_FIFO_TYPE:
 849 +                case SQUASHFS_SOCKET_TYPE: {
 850 +                       struct squashfs_ipc_inode_header *inodep = &id.ipc;
 851 +                       struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
 852 +
 853 +                       if (msblk->swap) {
 854 +                               if (!squashfs_get_cached_block(s, (char *)
 855 +                                               sinodep, block, offset,
 856 +                                               sizeof(*sinodep), &next_block,
 857 +                                               &next_offset))
 858 +                                       goto failed_read;
 859 +                               SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
 860 +                       } else
 861 +                               if (!squashfs_get_cached_block(s, (char *)
 862 +                                               inodep, block, offset,
 863 +                                               sizeof(*inodep), &next_block,
 864 +                                               &next_offset))
 865 +                                       goto failed_read;
 866 +
 867 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 868 +                               goto failed_read1;
 869 +
 870 +                       i->i_nlink = inodep->nlink;
 871 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
 872 +                                                       ? S_IFIFO : S_IFSOCK;
 873 +                       init_special_inode(i, i->i_mode, 0);
 874 +                       break;
 875 +                }
 876 +                default:
 877 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
 878 +                                       inodeb->inode_type);
 879 +                       goto failed_read1;
 880 +       }
 881 +
 882 +       insert_inode_hash(i);
 883 +       return i;
 884 +
 885 +failed_read:
 886 +       ERROR("Unable to read inode [%llx:%x]\n", block, offset);
 887 +
 888 +failed_read1:
 889 +       return NULL;
 890 +}
 891 +
 892 +
 893 +int read_fragment_index_table(struct super_block *s)
 894 +{
 895 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 896 +       struct squashfs_super_block *sblk = &msblk->sblk;
 897 +
 898 +       if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES
 899 +                                       (sblk->fragments), GFP_KERNEL))) {
 900 +               ERROR("Failed to allocate uid/gid table\n");
 901 +               return 0;
 902 +       }
 903 +
 904 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) &&
 905 +                                       !squashfs_read_data(s, (char *)
 906 +                                       msblk->fragment_index,
 907 +                                       sblk->fragment_table_start,
 908 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES
 909 +                                       (sblk->fragments) |
 910 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
 911 +               ERROR("unable to read fragment index table\n");
 912 +               return 0;
 913 +       }
 914 +
 915 +       if (msblk->swap) {
 916 +               int i;
 917 +               long long fragment;
 918 +
 919 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments);
 920 +                                                                       i++) {
 921 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
 922 +                                               &msblk->fragment_index[i], 1);
 923 +                       msblk->fragment_index[i] = fragment;
 924 +               }
 925 +       }
 926 +
 927 +       return 1;
 928 +}
 929 +
 930 +
 931 +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
 932 +{
 933 +       struct squashfs_super_block *sblk = &msblk->sblk;
 934 +
 935 +       msblk->iget = squashfs_iget;
 936 +       msblk->read_blocklist = read_blocklist;
 937 +       msblk->read_fragment_index_table = read_fragment_index_table;
 938 +
 939 +       if (sblk->s_major == 1) {
 940 +               if (!squashfs_1_0_supported(msblk)) {
 941 +                       SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
 942 +                               "are unsupported\n");
 943 +                       SERROR("Please recompile with "
 944 +                               "Squashfs 1.0 support enabled\n");
 945 +                       return 0;
 946 +               }
 947 +       } else if (sblk->s_major == 2) {
 948 +               if (!squashfs_2_0_supported(msblk)) {
 949 +                       SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
 950 +                               "are unsupported\n");
 951 +                       SERROR("Please recompile with "
 952 +                               "Squashfs 2.0 support enabled\n");
 953 +                       return 0;
 954 +               }
 955 +       } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor >
 956 +                       SQUASHFS_MINOR) {
 957 +               SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
 958 +                               "filesystem\n", sblk->s_major, sblk->s_minor);
 959 +               SERROR("Please update your kernel\n");
 960 +               return 0;
 961 +       }
 962 +
 963 +       return 1;
 964 +}
 965 +
 966 +
 967 +static struct super_block *squashfs_read_super(struct super_block *s,
 968 +               void *data, int silent)
 969 +{
 970 +       kdev_t dev = s->s_dev;
 971 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 972 +       struct squashfs_super_block *sblk = &msblk->sblk;
 973 +       int i;
 974 +       struct inode *root;
 975 +
 976 +       msblk->devblksize = get_hardsect_size(dev);
 977 +       if(msblk->devblksize < BLOCK_SIZE)
 978 +               msblk->devblksize = BLOCK_SIZE;
 979 +       msblk->devblksize_log2 = ffz(~msblk->devblksize);
 980 +        set_blocksize(dev, msblk->devblksize);
 981 +       s->s_blocksize = msblk->devblksize;
 982 +       s->s_blocksize_bits = msblk->devblksize_log2;
 983 +
 984 +       init_MUTEX(&msblk->read_data_mutex);
 985 +       init_MUTEX(&msblk->read_page_mutex);
 986 +       init_MUTEX(&msblk->block_cache_mutex);
 987 +       init_MUTEX(&msblk->fragment_mutex);
 988 +
 989 +       init_waitqueue_head(&msblk->waitq);
 990 +       init_waitqueue_head(&msblk->fragment_wait_queue);
 991 +
 992 +       if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
 993 +                                       sizeof(struct squashfs_super_block) |
 994 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
 995 +               SERROR("unable to read superblock\n");
 996 +               goto failed_mount;
 997 +       }
 998 +
 999 +       /* Check it is a SQUASHFS superblock */
1000 +       msblk->swap = 0;
1001 +       if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
1002 +               if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) {
1003 +                       struct squashfs_super_block ssblk;
1004 +
1005 +                       WARNING("Mounting a different endian SQUASHFS "
1006 +                               "filesystem on %s\n", bdevname(dev));
1007 +
1008 +                       SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
1009 +                       memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
1010 +                       msblk->swap = 1;
1011 +               } else  {
1012 +                       SERROR("Can't find a SQUASHFS superblock on %s\n",
1013 +                                                       bdevname(dev));
1014 +                       goto failed_mount;
1015 +               }
1016 +       }
1017 +
1018 +       /* Check the MAJOR & MINOR versions */
1019 +       if(!supported_squashfs_filesystem(msblk, silent))
1020 +               goto failed_mount;
1021 +
1022 +       TRACE("Found valid superblock on %s\n", bdevname(dev));
1023 +       TRACE("Inodes are %scompressed\n",
1024 +                                       SQUASHFS_UNCOMPRESSED_INODES
1025 +                                       (sblk->flags) ? "un" : "");
1026 +       TRACE("Data is %scompressed\n",
1027 +                                       SQUASHFS_UNCOMPRESSED_DATA(sblk->flags)
1028 +                                       ? "un" : "");
1029 +       TRACE("Check data is %s present in the filesystem\n",
1030 +                                       SQUASHFS_CHECK_DATA(sblk->flags) ?
1031 +                                       "" : "not");
1032 +       TRACE("Filesystem size %lld bytes\n", sblk->bytes_used);
1033 +       TRACE("Block size %d\n", sblk->block_size);
1034 +       TRACE("Number of inodes %d\n", sblk->inodes);
1035 +       if (sblk->s_major > 1)
1036 +               TRACE("Number of fragments %d\n", sblk->fragments);
1037 +       TRACE("Number of uids %d\n", sblk->no_uids);
1038 +       TRACE("Number of gids %d\n", sblk->no_guids);
1039 +       TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
1040 +       TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
1041 +       if (sblk->s_major > 1)
1042 +               TRACE("sblk->fragment_table_start %llx\n",
1043 +                                       sblk->fragment_table_start);
1044 +       TRACE("sblk->uid_start %llx\n", sblk->uid_start);
1045 +
1046 +       s->s_flags |= MS_RDONLY;
1047 +       s->s_op = &squashfs_ops;
1048 +
1049 +       /* Init inode_table block pointer array */
1050 +       if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) *
1051 +                                       SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
1052 +               ERROR("Failed to allocate block cache\n");
1053 +               goto failed_mount;
1054 +       }
1055 +
1056 +       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
1057 +               msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
1058 +
1059 +       msblk->next_cache = 0;
1060 +
1061 +       /* Allocate read_data block */
1062 +       msblk->read_size = (sblk->block_size < SQUASHFS_METADATA_SIZE) ?
1063 +                                       SQUASHFS_METADATA_SIZE :
1064 +                                       sblk->block_size;
1065 +
1066 +       if (!(msblk->read_data = kmalloc(msblk->read_size, GFP_KERNEL))) {
1067 +               ERROR("Failed to allocate read_data block\n");
1068 +               goto failed_mount;
1069 +       }
1070 +
1071 +       /* Allocate read_page block */
1072 +       if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
1073 +               ERROR("Failed to allocate read_page block\n");
1074 +               goto failed_mount;
1075 +       }
1076 +
1077 +       /* Allocate uid and gid tables */
1078 +       if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
1079 +                                       sizeof(unsigned int), GFP_KERNEL))) {
1080 +               ERROR("Failed to allocate uid/gid table\n");
1081 +               goto failed_mount;
1082 +       }
1083 +       msblk->guid = msblk->uid + sblk->no_uids;
1084 +
1085 +       if (msblk->swap) {
1086 +               unsigned int suid[sblk->no_uids + sblk->no_guids];
1087 +
1088 +               if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
1089 +                                       ((sblk->no_uids + sblk->no_guids) *
1090 +                                        sizeof(unsigned int)) |
1091 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1092 +                       ERROR("unable to read uid/gid table\n");
1093 +                       goto failed_mount;
1094 +               }
1095 +
1096 +               SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
1097 +                       sblk->no_guids), (sizeof(unsigned int) * 8));
1098 +       } else
1099 +               if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
1100 +                                       ((sblk->no_uids + sblk->no_guids) *
1101 +                                        sizeof(unsigned int)) |
1102 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1103 +                       ERROR("unable to read uid/gid table\n");
1104 +                       goto failed_mount;
1105 +               }
1106 +
1107 +
1108 +       if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
1109 +               goto allocate_root;
1110 +
1111 +       if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
1112 +                               SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
1113 +               ERROR("Failed to allocate fragment block cache\n");
1114 +               goto failed_mount;
1115 +       }
1116 +
1117 +       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
1118 +               msblk->fragment[i].locked = 0;
1119 +               msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
1120 +               msblk->fragment[i].data = NULL;
1121 +       }
1122 +
1123 +       msblk->next_fragment = 0;
1124 +
1125 +       /* Allocate fragment index table */
1126 +       if(msblk->read_fragment_index_table(s) == 0)
1127 +               goto failed_mount;
1128 +
1129 +allocate_root:
1130 +       if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL)
1131 +               goto failed_mount;
1132 +
1133 +       if ((s->s_root = d_alloc_root(root)) == NULL) {
1134 +               ERROR("Root inode create failed\n");
1135 +               iput(root);
1136 +               goto failed_mount;
1137 +       }
1138 +
1139 +       TRACE("Leaving squashfs_read_super\n");
1140 +       return s;
1141 +
1142 +failed_mount:
1143 +       kfree(msblk->fragment_index);
1144 +       kfree(msblk->fragment);
1145 +       kfree(msblk->uid);
1146 +       kfree(msblk->read_page);
1147 +       kfree(msblk->read_data);
1148 +       kfree(msblk->block_cache);
1149 +       kfree(msblk->fragment_index_2);
1150 +       return NULL;
1151 +}
1152 +
1153 +
1154 +static int squashfs_statfs(struct super_block *s, struct statfs *buf)
1155 +{
1156 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1157 +       struct squashfs_super_block *sblk = &msblk->sblk;
1158 +
1159 +       TRACE("Entered squashfs_statfs\n");
1160 +
1161 +       buf->f_type = SQUASHFS_MAGIC;
1162 +       buf->f_bsize = sblk->block_size;
1163 +       buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1;
1164 +       buf->f_bfree = buf->f_bavail = 0;
1165 +       buf->f_files = sblk->inodes;
1166 +       buf->f_ffree = 0;
1167 +       buf->f_namelen = SQUASHFS_NAME_LEN;
1168 +
1169 +       return 0;
1170 +}
1171 +
1172 +
1173 +static int squashfs_symlink_readpage(struct file *file, struct page *page)
1174 +{
1175 +       struct inode *inode = page->mapping->host;
1176 +       int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
1177 +       long long block = SQUASHFS_I(inode)->start_block;
1178 +       int offset = SQUASHFS_I(inode)->offset;
1179 +       void *pageaddr = kmap(page);
1180 +
1181 +       TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
1182 +                               "%llx, offset %x\n", page->index,
1183 +                               SQUASHFS_I(inode)->start_block,
1184 +                               SQUASHFS_I(inode)->offset);
1185 +
1186 +       for (length = 0; length < index; length += bytes) {
1187 +               if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
1188 +                               block, offset, PAGE_CACHE_SIZE, &block,
1189 +                               &offset))) {
1190 +                       ERROR("Unable to read symbolic link [%llx:%x]\n", block,
1191 +                                       offset);
1192 +                       goto skip_read;
1193 +               }
1194 +       }
1195 +
1196 +       if (length != index) {
1197 +               ERROR("(squashfs_symlink_readpage) length != index\n");
1198 +               bytes = 0;
1199 +               goto skip_read;
1200 +       }
1201 +
1202 +       bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
1203 +                                       i_size_read(inode) - length;
1204 +
1205 +       if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
1206 +                                       offset, bytes, &block, &offset)))
1207 +               ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
1208 +
1209 +skip_read:
1210 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1211 +       kunmap(page);
1212 +       SetPageUptodate(page);
1213 +       UnlockPage(page);
1214 +
1215 +       return 0;
1216 +}
1217 +
1218 +
1219 +struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
1220 +{
1221 +       struct meta_index *meta = NULL;
1222 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1223 +       int i;
1224 +
1225 +       down(&msblk->meta_index_mutex);
1226 +
1227 +       TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
1228 +
1229 +       if(msblk->meta_index == NULL)
1230 +               goto not_allocated;
1231 +
1232 +       for (i = 0; i < SQUASHFS_META_NUMBER; i ++)
1233 +               if (msblk->meta_index[i].inode_number == inode->i_ino &&
1234 +                               msblk->meta_index[i].offset >= offset &&
1235 +                               msblk->meta_index[i].offset <= index &&
1236 +                               msblk->meta_index[i].locked == 0) {
1237 +                       TRACE("locate_meta_index: entry %d, offset %d\n", i,
1238 +                                       msblk->meta_index[i].offset);
1239 +                       meta = &msblk->meta_index[i];
1240 +                       offset = meta->offset;
1241 +               }
1242 +
1243 +       if (meta)
1244 +               meta->locked = 1;
1245 +
1246 +not_allocated:
1247 +       up(&msblk->meta_index_mutex);
1248 +
1249 +       return meta;
1250 +}
1251 +
1252 +
1253 +struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
1254 +{
1255 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1256 +       struct meta_index *meta = NULL;
1257 +       int i;
1258 +
1259 +       down(&msblk->meta_index_mutex);
1260 +
1261 +       TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
1262 +
1263 +       if(msblk->meta_index == NULL) {
1264 +               if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
1265 +                                       SQUASHFS_META_NUMBER, GFP_KERNEL))) {
1266 +                       ERROR("Failed to allocate meta_index\n");
1267 +                       goto failed;
1268 +               }
1269 +               for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
1270 +                       msblk->meta_index[i].inode_number = 0;
1271 +                       msblk->meta_index[i].locked = 0;
1272 +               }
1273 +               msblk->next_meta_index = 0;
1274 +       }
1275 +
1276 +       for(i = SQUASHFS_META_NUMBER; i &&
1277 +                       msblk->meta_index[msblk->next_meta_index].locked; i --)
1278 +               msblk->next_meta_index = (msblk->next_meta_index + 1) %
1279 +                       SQUASHFS_META_NUMBER;
1280 +
1281 +       if(i == 0) {
1282 +               TRACE("empty_meta_index: failed!\n");
1283 +               goto failed;
1284 +       }
1285 +
1286 +       TRACE("empty_meta_index: returned meta entry %d, %p\n",
1287 +                       msblk->next_meta_index,
1288 +                       &msblk->meta_index[msblk->next_meta_index]);
1289 +
1290 +       meta = &msblk->meta_index[msblk->next_meta_index];
1291 +       msblk->next_meta_index = (msblk->next_meta_index + 1) %
1292 +                       SQUASHFS_META_NUMBER;
1293 +
1294 +       meta->inode_number = inode->i_ino;
1295 +       meta->offset = offset;
1296 +       meta->skip = skip;
1297 +       meta->entries = 0;
1298 +       meta->locked = 1;
1299 +
1300 +failed:
1301 +       up(&msblk->meta_index_mutex);
1302 +       return meta;
1303 +}
1304 +
1305 +
1306 +void release_meta_index(struct inode *inode, struct meta_index *meta)
1307 +{
1308 +       meta->locked = 0;
1309 +}
1310 +
1311 +
1312 +static int read_block_index(struct super_block *s, int blocks, char *block_list,
1313 +               long long *start_block, int *offset)
1314 +{
1315 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1316 +       unsigned int *block_listp;
1317 +       int block = 0;
1318 +
1319 +       if (msblk->swap) {
1320 +               char sblock_list[blocks << 2];
1321 +
1322 +               if (!squashfs_get_cached_block(s, sblock_list, *start_block,
1323 +                               *offset, blocks << 2, start_block, offset)) {
1324 +                       ERROR("Unable to read block list [%llx:%x]\n",
1325 +                               *start_block, *offset);
1326 +                       goto failure;
1327 +               }
1328 +               SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
1329 +                               ((unsigned int *)sblock_list), blocks);
1330 +       } else
1331 +               if (!squashfs_get_cached_block(s, block_list, *start_block,
1332 +                               *offset, blocks << 2, start_block, offset)) {
1333 +                       ERROR("Unable to read block list [%llx:%x]\n",
1334 +                               *start_block, *offset);
1335 +                       goto failure;
1336 +               }
1337 +
1338 +       for (block_listp = (unsigned int *) block_list; blocks;
1339 +                               block_listp++, blocks --)
1340 +               block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
1341 +
1342 +       return block;
1343 +
1344 +failure:
1345 +       return -1;
1346 +}
1347 +
1348 +
1349 +#define SIZE 256
1350 +
1351 +static inline int calculate_skip(int blocks) {
1352 +       int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES);
1353 +       return skip >= 7 ? 7 : skip + 1;
1354 +}
1355 +
1356 +
1357 +static int get_meta_index(struct inode *inode, int index,
1358 +               long long *index_block, int *index_offset,
1359 +               long long *data_block, char *block_list)
1360 +{
1361 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1362 +       struct squashfs_super_block *sblk = &msblk->sblk;
1363 +       int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
1364 +       int offset = 0;
1365 +       struct meta_index *meta;
1366 +       struct meta_entry *meta_entry;
1367 +       long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
1368 +       int cur_offset = SQUASHFS_I(inode)->offset;
1369 +       long long cur_data_block = SQUASHFS_I(inode)->start_block;
1370 +       int i;
1371 +
1372 +       index /= SQUASHFS_META_INDEXES * skip;
1373 +
1374 +       while ( offset < index ) {
1375 +               meta = locate_meta_index(inode, index, offset + 1);
1376 +
1377 +               if (meta == NULL) {
1378 +                       if ((meta = empty_meta_index(inode, offset + 1,
1379 +                                                       skip)) == NULL)
1380 +                               goto all_done;
1381 +               } else {
1382 +                       offset = index < meta->offset + meta->entries ? index :
1383 +                               meta->offset + meta->entries - 1;
1384 +                       meta_entry = &meta->meta_entry[offset - meta->offset];
1385 +                       cur_index_block = meta_entry->index_block + sblk->inode_table_start;
1386 +                       cur_offset = meta_entry->offset;
1387 +                       cur_data_block = meta_entry->data_block;
1388 +                       TRACE("get_meta_index: offset %d, meta->offset %d, "
1389 +                               "meta->entries %d\n", offset, meta->offset,
1390 +                               meta->entries);
1391 +                       TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
1392 +                               " data_block 0x%llx\n", cur_index_block,
1393 +                               cur_offset, cur_data_block);
1394 +               }
1395 +
1396 +               for (i = meta->offset + meta->entries; i <= index &&
1397 +                               i < meta->offset + SQUASHFS_META_ENTRIES; i++) {
1398 +                       int blocks = skip * SQUASHFS_META_INDEXES;
1399 +
1400 +                       while (blocks) {
1401 +                               int block = blocks > (SIZE >> 2) ? (SIZE >> 2) :
1402 +                                       blocks;
1403 +                               int res = read_block_index(inode->i_sb, block,
1404 +                                       block_list, &cur_index_block,
1405 +                                       &cur_offset);
1406 +
1407 +                               if (res == -1)
1408 +                                       goto failed;
1409 +
1410 +                               cur_data_block += res;
1411 +                               blocks -= block;
1412 +                       }
1413 +
1414 +                       meta_entry = &meta->meta_entry[i - meta->offset];
1415 +                       meta_entry->index_block = cur_index_block - sblk->inode_table_start;
1416 +                       meta_entry->offset = cur_offset;
1417 +                       meta_entry->data_block = cur_data_block;
1418 +                       meta->entries ++;
1419 +                       offset ++;
1420 +               }
1421 +
1422 +               TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
1423 +                               meta->offset, meta->entries);
1424 +
1425 +               release_meta_index(inode, meta);
1426 +       }
1427 +
1428 +all_done:
1429 +       *index_block = cur_index_block;
1430 +       *index_offset = cur_offset;
1431 +       *data_block = cur_data_block;
1432 +
1433 +       return offset * SQUASHFS_META_INDEXES * skip;
1434 +
1435 +failed:
1436 +       release_meta_index(inode, meta);
1437 +       return -1;
1438 +}
1439 +
1440 +
1441 +static long long read_blocklist(struct inode *inode, int index,
1442 +                               int readahead_blks, char *block_list,
1443 +                               unsigned short **block_p, unsigned int *bsize)
1444 +{
1445 +       long long block_ptr;
1446 +       int offset;
1447 +       long long block;
1448 +       int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
1449 +               block_list);
1450 +
1451 +       TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
1452 +                      " 0x%x, block 0x%llx\n", res, index, block_ptr, offset,
1453 +                      block);
1454 +
1455 +       if(res == -1)
1456 +               goto failure;
1457 +
1458 +       index -= res;
1459 +
1460 +       while ( index ) {
1461 +               int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
1462 +               int res = read_block_index(inode->i_sb, blocks, block_list,
1463 +                       &block_ptr, &offset);
1464 +               if (res == -1)
1465 +                       goto failure;
1466 +               block += res;
1467 +               index -= blocks;
1468 +       }
1469 +
1470 +       if (read_block_index(inode->i_sb, 1, block_list,
1471 +                       &block_ptr, &offset) == -1)
1472 +               goto failure;
1473 +       *bsize = *((unsigned int *) block_list);
1474 +
1475 +       return block;
1476 +
1477 +failure:
1478 +       return 0;
1479 +}
1480 +
1481 +
1482 +static int squashfs_readpage(struct file *file, struct page *page)
1483 +{
1484 +       struct inode *inode = page->mapping->host;
1485 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1486 +       struct squashfs_super_block *sblk = &msblk->sblk;
1487 +       unsigned char block_list[SIZE];
1488 +       long long block;
1489 +       unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
1490 +       int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
1491 +       void *pageaddr;
1492 +       struct squashfs_fragment_cache *fragment = NULL;
1493 +       char *data_ptr = msblk->read_page;
1494 +
1495 +       int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
1496 +       int start_index = page->index & ~mask;
1497 +       int end_index = start_index | mask;
1498 +
1499 +       TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
1500 +                                       page->index,
1501 +                                       SQUASHFS_I(inode)->start_block);
1502 +
1503 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1504 +                                       PAGE_CACHE_SHIFT))
1505 +               goto skip_read;
1506 +
1507 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1508 +                                       || index < (i_size_read(inode) >>
1509 +                                       sblk->block_log)) {
1510 +               if ((block = (msblk->read_blocklist)(inode, index, 1,
1511 +                                       block_list, NULL, &bsize)) == 0)
1512 +                       goto skip_read;
1513 +
1514 +               down(&msblk->read_page_mutex);
1515 +
1516 +               if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
1517 +                                       block, bsize, NULL))) {
1518 +                       ERROR("Unable to read page, block %llx, size %x\n", block,
1519 +                                       bsize);
1520 +                       up(&msblk->read_page_mutex);
1521 +                       goto skip_read;
1522 +               }
1523 +       } else {
1524 +               if ((fragment = get_cached_fragment(inode->i_sb,
1525 +                                       SQUASHFS_I(inode)->
1526 +                                       u.s1.fragment_start_block,
1527 +                                       SQUASHFS_I(inode)->u.s1.fragment_size))
1528 +                                       == NULL) {
1529 +                       ERROR("Unable to read page, block %llx, size %x\n",
1530 +                                       SQUASHFS_I(inode)->
1531 +                                       u.s1.fragment_start_block,
1532 +                                       (int) SQUASHFS_I(inode)->
1533 +                                       u.s1.fragment_size);
1534 +                       goto skip_read;
1535 +               }
1536 +               bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
1537 +                                       (i_size_read(inode) & (sblk->block_size
1538 +                                       - 1));
1539 +               byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
1540 +               data_ptr = fragment->data;
1541 +       }
1542 +
1543 +       for (i = start_index; i <= end_index && byte_offset < bytes;
1544 +                                       i++, byte_offset += PAGE_CACHE_SIZE) {
1545 +               struct page *push_page;
1546 +               int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ?
1547 +                                       PAGE_CACHE_SIZE : bytes - byte_offset;
1548 +
1549 +               TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n",
1550 +                                       bytes, i, byte_offset, available_bytes);
1551 +
1552 +               if (i == page->index)  {
1553 +                       pageaddr = kmap_atomic(page, KM_USER0);
1554 +                       memcpy(pageaddr, data_ptr + byte_offset,
1555 +                                       available_bytes);
1556 +                       memset(pageaddr + available_bytes, 0,
1557 +                                       PAGE_CACHE_SIZE - available_bytes);
1558 +                       kunmap_atomic(pageaddr, KM_USER0);
1559 +                       flush_dcache_page(page);
1560 +                       SetPageUptodate(page);
1561 +                       UnlockPage(page);
1562 +               } else if ((push_page =
1563 +                               grab_cache_page_nowait(page->mapping, i))) {
1564 +                       pageaddr = kmap_atomic(push_page, KM_USER0);
1565 +
1566 +                       memcpy(pageaddr, data_ptr + byte_offset,
1567 +                                       available_bytes);
1568 +                       memset(pageaddr + available_bytes, 0,
1569 +                                       PAGE_CACHE_SIZE - available_bytes);
1570 +                       kunmap_atomic(pageaddr, KM_USER0);
1571 +                       flush_dcache_page(push_page);
1572 +                       SetPageUptodate(push_page);
1573 +                       UnlockPage(push_page);
1574 +                       page_cache_release(push_page);
1575 +               }
1576 +       }
1577 +
1578 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1579 +                                       || index < (i_size_read(inode) >>
1580 +                                       sblk->block_log))
1581 +               up(&msblk->read_page_mutex);
1582 +       else
1583 +               release_cached_fragment(msblk, fragment);
1584 +
1585 +       return 0;
1586 +
1587 +skip_read:
1588 +       pageaddr = kmap_atomic(page, KM_USER0);
1589 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1590 +       kunmap_atomic(pageaddr, KM_USER0);
1591 +       flush_dcache_page(page);
1592 +       SetPageUptodate(page);
1593 +       UnlockPage(page);
1594 +
1595 +       return 0;
1596 +}
1597 +
1598 +
1599 +static int squashfs_readpage4K(struct file *file, struct page *page)
1600 +{
1601 +       struct inode *inode = page->mapping->host;
1602 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1603 +       struct squashfs_super_block *sblk = &msblk->sblk;
1604 +       unsigned char block_list[SIZE];
1605 +       long long block;
1606 +       unsigned int bsize, bytes = 0;
1607 +       void *pageaddr;
1608 +
1609 +       TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
1610 +                                       page->index,
1611 +                                       SQUASHFS_I(inode)->start_block);
1612 +
1613 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1614 +                                       PAGE_CACHE_SHIFT)) {
1615 +               pageaddr = kmap_atomic(page, KM_USER0);
1616 +               goto skip_read;
1617 +       }
1618 +
1619 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1620 +                                       || page->index < (i_size_read(inode) >>
1621 +                                       sblk->block_log)) {
1622 +               block = (msblk->read_blocklist)(inode, page->index, 1,
1623 +                                       block_list, NULL, &bsize);
1624 +
1625 +               down(&msblk->read_page_mutex);
1626 +               bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
1627 +                                       bsize, NULL);
1628 +               pageaddr = kmap_atomic(page, KM_USER0);
1629 +               if (bytes)
1630 +                       memcpy(pageaddr, msblk->read_page, bytes);
1631 +               else
1632 +                       ERROR("Unable to read page, block %llx, size %x\n",
1633 +                                       block, bsize);
1634 +               up(&msblk->read_page_mutex);
1635 +       } else {
1636 +               struct squashfs_fragment_cache *fragment =
1637 +                       get_cached_fragment(inode->i_sb,
1638 +                                       SQUASHFS_I(inode)->
1639 +                                       u.s1.fragment_start_block,
1640 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1641 +               pageaddr = kmap_atomic(page, KM_USER0);
1642 +               if (fragment) {
1643 +                       bytes = i_size_read(inode) & (sblk->block_size - 1);
1644 +                       memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
1645 +                                       u.s1.fragment_offset, bytes);
1646 +                       release_cached_fragment(msblk, fragment);
1647 +               } else
1648 +                       ERROR("Unable to read page, block %llx, size %x\n",
1649 +                                       SQUASHFS_I(inode)->
1650 +                                       u.s1.fragment_start_block, (int)
1651 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1652 +       }
1653 +
1654 +skip_read:
1655 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1656 +       kunmap_atomic(pageaddr, KM_USER0);
1657 +       flush_dcache_page(page);
1658 +       SetPageUptodate(page);
1659 +       UnlockPage(page);
1660 +
1661 +       return 0;
1662 +}
1663 +
1664 +
1665 +static int get_dir_index_using_offset(struct super_block *s, long long
1666 +                               *next_block, unsigned int *next_offset,
1667 +                               long long index_start,
1668 +                               unsigned int index_offset, int i_count,
1669 +                               long long f_pos)
1670 +{
1671 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1672 +       struct squashfs_super_block *sblk = &msblk->sblk;
1673 +       int i, length = 0;
1674 +       struct squashfs_dir_index index;
1675 +
1676 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
1677 +                                       i_count, (unsigned int) f_pos);
1678 +
1679 +       f_pos -= 3;
1680 +       if (f_pos == 0)
1681 +               goto finish;
1682 +
1683 +       for (i = 0; i < i_count; i++) {
1684 +               if (msblk->swap) {
1685 +                       struct squashfs_dir_index sindex;
1686 +                       squashfs_get_cached_block(s, (char *) &sindex,
1687 +                                       index_start, index_offset,
1688 +                                       sizeof(sindex), &index_start,
1689 +                                       &index_offset);
1690 +                       SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
1691 +               } else
1692 +                       squashfs_get_cached_block(s, (char *) &index,
1693 +                                       index_start, index_offset,
1694 +                                       sizeof(index), &index_start,
1695 +                                       &index_offset);
1696 +
1697 +               if (index.index > f_pos)
1698 +                       break;
1699 +
1700 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
1701 +                                       index.size + 1, &index_start,
1702 +                                       &index_offset);
1703 +
1704 +               length = index.index;
1705 +               *next_block = index.start_block + sblk->directory_table_start;
1706 +       }
1707 +
1708 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1709 +
1710 +finish:
1711 +       return length + 3;
1712 +}
1713 +
1714 +
1715 +static int get_dir_index_using_name(struct super_block *s, long long
1716 +                               *next_block, unsigned int *next_offset,
1717 +                               long long index_start,
1718 +                               unsigned int index_offset, int i_count,
1719 +                               const char *name, int size)
1720 +{
1721 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1722 +       struct squashfs_super_block *sblk = &msblk->sblk;
1723 +       int i, length = 0;
1724 +       char buffer[sizeof(struct squashfs_dir_index) + SQUASHFS_NAME_LEN + 1];
1725 +       struct squashfs_dir_index *index = (struct squashfs_dir_index *) buffer;
1726 +       char str[SQUASHFS_NAME_LEN + 1];
1727 +
1728 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
1729 +
1730 +       strncpy(str, name, size);
1731 +       str[size] = '\0';
1732 +
1733 +       for (i = 0; i < i_count; i++) {
1734 +               if (msblk->swap) {
1735 +                       struct squashfs_dir_index sindex;
1736 +                       squashfs_get_cached_block(s, (char *) &sindex,
1737 +                                       index_start, index_offset,
1738 +                                       sizeof(sindex), &index_start,
1739 +                                       &index_offset);
1740 +                       SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
1741 +               } else
1742 +                       squashfs_get_cached_block(s, (char *) index,
1743 +                                       index_start, index_offset,
1744 +                                       sizeof(struct squashfs_dir_index),
1745 +                                       &index_start, &index_offset);
1746 +
1747 +               squashfs_get_cached_block(s, index->name, index_start,
1748 +                                       index_offset, index->size + 1,
1749 +                                       &index_start, &index_offset);
1750 +
1751 +               index->name[index->size + 1] = '\0';
1752 +
1753 +               if (strcmp(index->name, str) > 0)
1754 +                       break;
1755 +
1756 +               length = index->index;
1757 +               *next_block = index->start_block + sblk->directory_table_start;
1758 +       }
1759 +
1760 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1761 +       return length + 3;
1762 +}
1763 +
1764 +
1765 +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
1766 +{
1767 +       struct inode *i = file->f_dentry->d_inode;
1768 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
1769 +       struct squashfs_super_block *sblk = &msblk->sblk;
1770 +       long long next_block = SQUASHFS_I(i)->start_block +
1771 +               sblk->directory_table_start;
1772 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
1773 +               dir_count;
1774 +       struct squashfs_dir_header dirh;
1775 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
1776 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1777 +
1778 +       TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
1779 +
1780 +       while(file->f_pos < 3) {
1781 +               char *name;
1782 +               int size, i_ino;
1783 +
1784 +               if(file->f_pos == 0) {
1785 +                       name = ".";
1786 +                       size = 1;
1787 +                       i_ino = i->i_ino;
1788 +               } else {
1789 +                       name = "..";
1790 +                       size = 2;
1791 +                       i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
1792 +               }
1793 +               TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
1794 +                               (unsigned int) dirent, name, size, (int)
1795 +                               file->f_pos, i_ino,
1796 +                               squashfs_filetype_table[1]);
1797 +
1798 +               if (filldir(dirent, name, size,
1799 +                               file->f_pos, i_ino,
1800 +                               squashfs_filetype_table[1]) < 0) {
1801 +                               TRACE("Filldir returned less than 0\n");
1802 +                               goto finish;
1803 +               }
1804 +               file->f_pos += size;
1805 +               dirs_read++;
1806 +       }
1807 +
1808 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
1809 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
1810 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
1811 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
1812 +                               file->f_pos);
1813 +
1814 +       while (length < i_size_read(i)) {
1815 +               /* read directory header */
1816 +               if (msblk->swap) {
1817 +                       struct squashfs_dir_header sdirh;
1818 +
1819 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
1820 +                                       next_block, next_offset, sizeof(sdirh),
1821 +                                       &next_block, &next_offset))
1822 +                               goto failed_read;
1823 +
1824 +                       length += sizeof(sdirh);
1825 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1826 +               } else {
1827 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
1828 +                                       next_block, next_offset, sizeof(dirh),
1829 +                                       &next_block, &next_offset))
1830 +                               goto failed_read;
1831 +
1832 +                       length += sizeof(dirh);
1833 +               }
1834 +
1835 +               dir_count = dirh.count + 1;
1836 +               while (dir_count--) {
1837 +                       if (msblk->swap) {
1838 +                               struct squashfs_dir_entry sdire;
1839 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1840 +                                               &sdire, next_block, next_offset,
1841 +                                               sizeof(sdire), &next_block,
1842 +                                               &next_offset))
1843 +                                       goto failed_read;
1844 +
1845 +                               length += sizeof(sdire);
1846 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1847 +                       } else {
1848 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1849 +                                               dire, next_block, next_offset,
1850 +                                               sizeof(*dire), &next_block,
1851 +                                               &next_offset))
1852 +                                       goto failed_read;
1853 +
1854 +                               length += sizeof(*dire);
1855 +                       }
1856 +
1857 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
1858 +                                               next_block, next_offset,
1859 +                                               dire->size + 1, &next_block,
1860 +                                               &next_offset))
1861 +                               goto failed_read;
1862 +
1863 +                       length += dire->size + 1;
1864 +
1865 +                       if (file->f_pos >= length)
1866 +                               continue;
1867 +
1868 +                       dire->name[dire->size + 1] = '\0';
1869 +
1870 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
1871 +                                       (unsigned int) dirent, dire->name,
1872 +                                       dire->size + 1, (int) file->f_pos,
1873 +                                       dirh.start_block, dire->offset,
1874 +                                       dirh.inode_number + dire->inode_number,
1875 +                                       squashfs_filetype_table[dire->type]);
1876 +
1877 +                       if (filldir(dirent, dire->name, dire->size + 1,
1878 +                                       file->f_pos,
1879 +                                       dirh.inode_number + dire->inode_number,
1880 +                                       squashfs_filetype_table[dire->type])
1881 +                                       < 0) {
1882 +                               TRACE("Filldir returned less than 0\n");
1883 +                               goto finish;
1884 +                       }
1885 +                       file->f_pos = length;
1886 +                       dirs_read++;
1887 +               }
1888 +       }
1889 +
1890 +finish:
1891 +       return dirs_read;
1892 +
1893 +failed_read:
1894 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
1895 +               next_offset);
1896 +       return 0;
1897 +}
1898 +
1899 +
1900 +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry)
1901 +{
1902 +       const unsigned char *name = dentry->d_name.name;
1903 +       int len = dentry->d_name.len;
1904 +       struct inode *inode = NULL;
1905 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
1906 +       struct squashfs_super_block *sblk = &msblk->sblk;
1907 +       long long next_block = SQUASHFS_I(i)->start_block +
1908 +                               sblk->directory_table_start;
1909 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
1910 +                               dir_count;
1911 +       struct squashfs_dir_header dirh;
1912 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN];
1913 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1914 +
1915 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
1916 +
1917 +       if (len > SQUASHFS_NAME_LEN)
1918 +               goto exit_loop;
1919 +
1920 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
1921 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
1922 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
1923 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
1924 +                               len);
1925 +
1926 +       while (length < i_size_read(i)) {
1927 +               /* read directory header */
1928 +               if (msblk->swap) {
1929 +                       struct squashfs_dir_header sdirh;
1930 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
1931 +                                       next_block, next_offset, sizeof(sdirh),
1932 +                                       &next_block, &next_offset))
1933 +                               goto failed_read;
1934 +
1935 +                       length += sizeof(sdirh);
1936 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1937 +               } else {
1938 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
1939 +                                       next_block, next_offset, sizeof(dirh),
1940 +                                       &next_block, &next_offset))
1941 +                               goto failed_read;
1942 +
1943 +                       length += sizeof(dirh);
1944 +               }
1945 +
1946 +               dir_count = dirh.count + 1;
1947 +               while (dir_count--) {
1948 +                       if (msblk->swap) {
1949 +                               struct squashfs_dir_entry sdire;
1950 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1951 +                                               &sdire, next_block,next_offset,
1952 +                                               sizeof(sdire), &next_block,
1953 +                                               &next_offset))
1954 +                                       goto failed_read;
1955 +
1956 +                               length += sizeof(sdire);
1957 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1958 +                       } else {
1959 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1960 +                                               dire, next_block,next_offset,
1961 +                                               sizeof(*dire), &next_block,
1962 +                                               &next_offset))
1963 +                                       goto failed_read;
1964 +
1965 +                               length += sizeof(*dire);
1966 +                       }
1967 +
1968 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
1969 +                                       next_block, next_offset, dire->size + 1,
1970 +                                       &next_block, &next_offset))
1971 +                               goto failed_read;
1972 +
1973 +                       length += dire->size + 1;
1974 +
1975 +                       if (name[0] < dire->name[0])
1976 +                               goto exit_loop;
1977 +
1978 +                       if ((len == dire->size + 1) && !strncmp(name,
1979 +                                               dire->name, len)) {
1980 +                               squashfs_inode_t ino =
1981 +                                       SQUASHFS_MKINODE(dirh.start_block,
1982 +                                       dire->offset);
1983 +
1984 +                               TRACE("calling squashfs_iget for directory "
1985 +                                       "entry %s, inode %x:%x, %d\n", name,
1986 +                                       dirh.start_block, dire->offset,
1987 +                                       dirh.inode_number + dire->inode_number);
1988 +
1989 +                               inode = (msblk->iget)(i->i_sb, ino);
1990 +
1991 +                               goto exit_loop;
1992 +                       }
1993 +               }
1994 +       }
1995 +
1996 +exit_loop:
1997 +       d_add(dentry, inode);
1998 +       return ERR_PTR(0);
1999 +
2000 +failed_read:
2001 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2002 +               next_offset);
2003 +       goto exit_loop;
2004 +}
2005 +
2006 +
2007 +static void squashfs_put_super(struct super_block *s)
2008 +{
2009 +       int i;
2010 +
2011 +               struct squashfs_sb_info *sbi = &s->u.squashfs_sb;
2012 +               if (sbi->block_cache)
2013 +                       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
2014 +                               if (sbi->block_cache[i].block !=
2015 +                                                       SQUASHFS_INVALID_BLK)
2016 +                                       kfree(sbi->block_cache[i].data);
2017 +               if (sbi->fragment)
2018 +                       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++)
2019 +                               SQUASHFS_FREE(sbi->fragment[i].data);
2020 +               kfree(sbi->fragment);
2021 +               kfree(sbi->block_cache);
2022 +               kfree(sbi->read_data);
2023 +               kfree(sbi->read_page);
2024 +               kfree(sbi->uid);
2025 +               kfree(sbi->fragment_index);
2026 +               kfree(sbi->fragment_index_2);
2027 +               sbi->block_cache = NULL;
2028 +               sbi->uid = NULL;
2029 +               sbi->read_data = NULL;
2030 +               sbi->read_page = NULL;
2031 +               sbi->fragment = NULL;
2032 +               sbi->fragment_index = NULL;
2033 +               sbi->fragment_index_2 = NULL;
2034 +}
2035 +
2036 +
2037 +static int __init init_squashfs_fs(void)
2038 +{
2039 +
2040 +       printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
2041 +               "Phillip Lougher\n");
2042 +
2043 +       if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
2044 +               ERROR("Failed to allocate zlib workspace\n");
2045 +               return -ENOMEM;
2046 +       }
2047 +       return register_filesystem(&squashfs_fs_type);
2048 +}
2049 +
2050 +
2051 +static void __exit exit_squashfs_fs(void)
2052 +{
2053 +       vfree(stream.workspace);
2054 +       unregister_filesystem(&squashfs_fs_type);
2055 +}
2056 +
2057 +
2058 +EXPORT_NO_SYMBOLS;
2059 +
2060 +module_init(init_squashfs_fs);
2061 +module_exit(exit_squashfs_fs);
2062 +MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
2063 +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
2064 +MODULE_LICENSE("GPL");
2065 Index: linux-2.4.35.4/fs/squashfs/Makefile
2066 ===================================================================
2067 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
2068 +++ linux-2.4.35.4/fs/squashfs/Makefile 2007-12-15 05:19:48.651193513 +0100
2069 @@ -0,0 +1,11 @@
2070 +#
2071 +# Makefile for the linux squashfs routines.
2072 +#
2073 +
2074 +O_TARGET := squashfs.o
2075 +
2076 +obj-y  := inode.o squashfs2_0.o
2077 +
2078 +obj-m := $(O_TARGET)
2079 +
2080 +include $(TOPDIR)/Rules.make
2081 Index: linux-2.4.35.4/fs/squashfs/squashfs2_0.c
2082 ===================================================================
2083 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
2084 +++ linux-2.4.35.4/fs/squashfs/squashfs2_0.c    2007-12-15 05:19:48.655193739 +0100
2085 @@ -0,0 +1,751 @@
2086 +/*
2087 + * Squashfs - a compressed read only filesystem for Linux
2088 + *
2089 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2090 + * Phillip Lougher <phillip@lougher.org.uk>
2091 + *
2092 + * This program is free software; you can redistribute it and/or
2093 + * modify it under the terms of the GNU General Public License
2094 + * as published by the Free Software Foundation; either version 2,
2095 + * or (at your option) any later version.
2096 + *
2097 + * This program is distributed in the hope that it will be useful,
2098 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2099 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2100 + * GNU General Public License for more details.
2101 + *
2102 + * You should have received a copy of the GNU General Public License
2103 + * along with this program; if not, write to the Free Software
2104 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2105 + *
2106 + * squashfs2_0.c
2107 + */
2108 +
2109 +#include <linux/types.h>
2110 +#include <linux/squashfs_fs.h>
2111 +#include <linux/module.h>
2112 +#include <linux/errno.h>
2113 +#include <linux/slab.h>
2114 +#include <linux/fs.h>
2115 +#include <linux/smp_lock.h>
2116 +#include <linux/locks.h>
2117 +#include <linux/init.h>
2118 +#include <linux/dcache.h>
2119 +#include <linux/wait.h>
2120 +#include <linux/zlib.h>
2121 +#include <linux/blkdev.h>
2122 +#include <linux/vmalloc.h>
2123 +#include <asm/uaccess.h>
2124 +#include <asm/semaphore.h>
2125 +#include "squashfs.h"
2126 +
2127 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
2128 +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry);
2129 +
2130 +static struct file_operations squashfs_dir_ops_2 = {
2131 +       .read = generic_read_dir,
2132 +       .readdir = squashfs_readdir_2
2133 +};
2134 +
2135 +static struct inode_operations squashfs_dir_inode_ops_2 = {
2136 +       .lookup = squashfs_lookup_2
2137 +};
2138 +
2139 +static unsigned char squashfs_filetype_table[] = {
2140 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
2141 +};
2142 +
2143 +static int read_fragment_index_table_2(struct super_block *s)
2144 +{
2145 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2146 +       struct squashfs_super_block *sblk = &msblk->sblk;
2147 +
2148 +       if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
2149 +                                       (sblk->fragments), GFP_KERNEL))) {
2150 +               ERROR("Failed to allocate uid/gid table\n");
2151 +               return 0;
2152 +       }
2153 +
2154 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
2155 +                                       !squashfs_read_data(s, (char *)
2156 +                                       msblk->fragment_index_2,
2157 +                                       sblk->fragment_table_start,
2158 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES_2
2159 +                                       (sblk->fragments) |
2160 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
2161 +               ERROR("unable to read fragment index table\n");
2162 +               return 0;
2163 +       }
2164 +
2165 +       if (msblk->swap) {
2166 +               int i;
2167 +               unsigned int fragment;
2168 +
2169 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
2170 +                                                                       i++) {
2171 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
2172 +                                               &msblk->fragment_index_2[i], 1);
2173 +                       msblk->fragment_index_2[i] = fragment;
2174 +               }
2175 +       }
2176 +
2177 +       return 1;
2178 +}
2179 +
2180 +
2181 +static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
2182 +                               long long *fragment_start_block,
2183 +                               unsigned int *fragment_size)
2184 +{
2185 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2186 +       long long start_block =
2187 +               msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
2188 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
2189 +       struct squashfs_fragment_entry_2 fragment_entry;
2190 +
2191 +       if (msblk->swap) {
2192 +               struct squashfs_fragment_entry_2 sfragment_entry;
2193 +
2194 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
2195 +                                       start_block, offset,
2196 +                                       sizeof(sfragment_entry), &start_block,
2197 +                                       &offset))
2198 +                       goto out;
2199 +               SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
2200 +       } else
2201 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
2202 +                                       start_block, offset,
2203 +                                       sizeof(fragment_entry), &start_block,
2204 +                                       &offset))
2205 +                       goto out;
2206 +
2207 +       *fragment_start_block = fragment_entry.start_block;
2208 +       *fragment_size = fragment_entry.size;
2209 +
2210 +       return 1;
2211 +
2212 +out:
2213 +       return 0;
2214 +}
2215 +
2216 +
2217 +static struct inode *squashfs_new_inode(struct super_block *s,
2218 +               struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
2219 +{
2220 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2221 +       struct squashfs_super_block *sblk = &msblk->sblk;
2222 +       struct inode *i = new_inode(s);
2223 +
2224 +       if (i) {
2225 +               i->i_ino = ino;
2226 +               i->i_mtime = sblk->mkfs_time;
2227 +               i->i_atime = sblk->mkfs_time;
2228 +               i->i_ctime = sblk->mkfs_time;
2229 +               i->i_uid = msblk->uid[inodeb->uid];
2230 +               i->i_mode = inodeb->mode;
2231 +               i->i_nlink = 1;
2232 +               i->i_size = 0;
2233 +               if (inodeb->guid == SQUASHFS_GUIDS)
2234 +                       i->i_gid = i->i_uid;
2235 +               else
2236 +                       i->i_gid = msblk->guid[inodeb->guid];
2237 +       }
2238 +
2239 +       return i;
2240 +}
2241 +
2242 +
2243 +static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
2244 +{
2245 +       struct inode *i;
2246 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2247 +       struct squashfs_super_block *sblk = &msblk->sblk;
2248 +       unsigned int block = SQUASHFS_INODE_BLK(inode) +
2249 +               sblk->inode_table_start;
2250 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
2251 +       unsigned int ino = SQUASHFS_MK_VFS_INODE(block
2252 +               - sblk->inode_table_start, offset);
2253 +       long long next_block;
2254 +       unsigned int next_offset;
2255 +       union squashfs_inode_header_2 id, sid;
2256 +       struct squashfs_base_inode_header_2 *inodeb = &id.base,
2257 +                                         *sinodeb = &sid.base;
2258 +
2259 +       TRACE("Entered squashfs_iget\n");
2260 +
2261 +       if (msblk->swap) {
2262 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
2263 +                                       offset, sizeof(*sinodeb), &next_block,
2264 +                                       &next_offset))
2265 +                       goto failed_read;
2266 +               SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
2267 +                                       sizeof(*sinodeb));
2268 +       } else
2269 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
2270 +                                       offset, sizeof(*inodeb), &next_block,
2271 +                                       &next_offset))
2272 +                       goto failed_read;
2273 +
2274 +       switch(inodeb->inode_type) {
2275 +               case SQUASHFS_FILE_TYPE: {
2276 +                       struct squashfs_reg_inode_header_2 *inodep = &id.reg;
2277 +                       struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
2278 +                       long long frag_blk;
2279 +                       unsigned int frag_size;
2280 +
2281 +                       if (msblk->swap) {
2282 +                               if (!squashfs_get_cached_block(s, (char *)
2283 +                                               sinodep, block, offset,
2284 +                                               sizeof(*sinodep), &next_block,
2285 +                                               &next_offset))
2286 +                                       goto failed_read;
2287 +                               SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
2288 +                       } else
2289 +                               if (!squashfs_get_cached_block(s, (char *)
2290 +                                               inodep, block, offset,
2291 +                                               sizeof(*inodep), &next_block,
2292 +                                               &next_offset))
2293 +                                       goto failed_read;
2294 +
2295 +                       frag_blk = SQUASHFS_INVALID_BLK;
2296 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
2297 +                                       !get_fragment_location_2(s,
2298 +                                       inodep->fragment, &frag_blk, &frag_size))
2299 +                               goto failed_read;
2300 +
2301 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2302 +                               goto failed_read1;
2303 +
2304 +                       i->i_size = inodep->file_size;
2305 +                       i->i_fop = &generic_ro_fops;
2306 +                       i->i_mode |= S_IFREG;
2307 +                       i->i_mtime = inodep->mtime;
2308 +                       i->i_atime = inodep->mtime;
2309 +                       i->i_ctime = inodep->mtime;
2310 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
2311 +                       i->i_blksize = PAGE_CACHE_SIZE;
2312 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
2313 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
2314 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
2315 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2316 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
2317 +                       SQUASHFS_I(i)->offset = next_offset;
2318 +                       if (sblk->block_size > 4096)
2319 +                               i->i_data.a_ops = &squashfs_aops;
2320 +                       else
2321 +                               i->i_data.a_ops = &squashfs_aops_4K;
2322 +
2323 +                       TRACE("File inode %x:%x, start_block %x, "
2324 +                                       "block_list_start %llx, offset %x\n",
2325 +                                       SQUASHFS_INODE_BLK(inode), offset,
2326 +                                       inodep->start_block, next_block,
2327 +                                       next_offset);
2328 +                       break;
2329 +               }
2330 +               case SQUASHFS_DIR_TYPE: {
2331 +                       struct squashfs_dir_inode_header_2 *inodep = &id.dir;
2332 +                       struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
2333 +
2334 +                       if (msblk->swap) {
2335 +                               if (!squashfs_get_cached_block(s, (char *)
2336 +                                               sinodep, block, offset,
2337 +                                               sizeof(*sinodep), &next_block,
2338 +                                               &next_offset))
2339 +                                       goto failed_read;
2340 +                               SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
2341 +                       } else
2342 +                               if (!squashfs_get_cached_block(s, (char *)
2343 +                                               inodep, block, offset,
2344 +                                               sizeof(*inodep), &next_block,
2345 +                                               &next_offset))
2346 +                                       goto failed_read;
2347 +
2348 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2349 +                               goto failed_read1;
2350 +
2351 +                       i->i_size = inodep->file_size;
2352 +                       i->i_op = &squashfs_dir_inode_ops_2;
2353 +                       i->i_fop = &squashfs_dir_ops_2;
2354 +                       i->i_mode |= S_IFDIR;
2355 +                       i->i_mtime = inodep->mtime;
2356 +                       i->i_atime = inodep->mtime;
2357 +                       i->i_ctime = inodep->mtime;
2358 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2359 +                       SQUASHFS_I(i)->offset = inodep->offset;
2360 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
2361 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2362 +
2363 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
2364 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
2365 +                                       offset, inodep->start_block,
2366 +                                       inodep->offset);
2367 +                       break;
2368 +               }
2369 +               case SQUASHFS_LDIR_TYPE: {
2370 +                       struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
2371 +                       struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
2372 +
2373 +                       if (msblk->swap) {
2374 +                               if (!squashfs_get_cached_block(s, (char *)
2375 +                                               sinodep, block, offset,
2376 +                                               sizeof(*sinodep), &next_block,
2377 +                                               &next_offset))
2378 +                                       goto failed_read;
2379 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
2380 +                                               sinodep);
2381 +                       } else
2382 +                               if (!squashfs_get_cached_block(s, (char *)
2383 +                                               inodep, block, offset,
2384 +                                               sizeof(*inodep), &next_block,
2385 +                                               &next_offset))
2386 +                                       goto failed_read;
2387 +
2388 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2389 +                               goto failed_read1;
2390 +
2391 +                       i->i_size = inodep->file_size;
2392 +                       i->i_op = &squashfs_dir_inode_ops_2;
2393 +                       i->i_fop = &squashfs_dir_ops_2;
2394 +                       i->i_mode |= S_IFDIR;
2395 +                       i->i_mtime = inodep->mtime;
2396 +                       i->i_atime = inodep->mtime;
2397 +                       i->i_ctime = inodep->mtime;
2398 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2399 +                       SQUASHFS_I(i)->offset = inodep->offset;
2400 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
2401 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
2402 +                                                               next_offset;
2403 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
2404 +                                                               inodep->i_count;
2405 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2406 +
2407 +                       TRACE("Long directory inode %x:%x, start_block %x, "
2408 +                                       "offset %x\n",
2409 +                                       SQUASHFS_INODE_BLK(inode), offset,
2410 +                                       inodep->start_block, inodep->offset);
2411 +                       break;
2412 +               }
2413 +               case SQUASHFS_SYMLINK_TYPE: {
2414 +                       struct squashfs_symlink_inode_header_2 *inodep =
2415 +                                                               &id.symlink;
2416 +                       struct squashfs_symlink_inode_header_2 *sinodep =
2417 +                                                               &sid.symlink;
2418 +
2419 +                       if (msblk->swap) {
2420 +                               if (!squashfs_get_cached_block(s, (char *)
2421 +                                               sinodep, block, offset,
2422 +                                               sizeof(*sinodep), &next_block,
2423 +                                               &next_offset))
2424 +                                       goto failed_read;
2425 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
2426 +                                                               sinodep);
2427 +                       } else
2428 +                               if (!squashfs_get_cached_block(s, (char *)
2429 +                                               inodep, block, offset,
2430 +                                               sizeof(*inodep), &next_block,
2431 +                                               &next_offset))
2432 +                                       goto failed_read;
2433 +
2434 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2435 +                               goto failed_read1;
2436 +
2437 +                       i->i_size = inodep->symlink_size;
2438 +                       i->i_op = &page_symlink_inode_operations;
2439 +                       i->i_data.a_ops = &squashfs_symlink_aops;
2440 +                       i->i_mode |= S_IFLNK;
2441 +                       SQUASHFS_I(i)->start_block = next_block;
2442 +                       SQUASHFS_I(i)->offset = next_offset;
2443 +
2444 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
2445 +                                       "offset %x\n",
2446 +                                       SQUASHFS_INODE_BLK(inode), offset,
2447 +                                       next_block, next_offset);
2448 +                       break;
2449 +                }
2450 +                case SQUASHFS_BLKDEV_TYPE:
2451 +                case SQUASHFS_CHRDEV_TYPE: {
2452 +                       struct squashfs_dev_inode_header_2 *inodep = &id.dev;
2453 +                       struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
2454 +
2455 +                       if (msblk->swap) {
2456 +                               if (!squashfs_get_cached_block(s, (char *)
2457 +                                               sinodep, block, offset,
2458 +                                               sizeof(*sinodep), &next_block,
2459 +                                               &next_offset))
2460 +                                       goto failed_read;
2461 +                               SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
2462 +                       } else
2463 +                               if (!squashfs_get_cached_block(s, (char *)
2464 +                                               inodep, block, offset,
2465 +                                               sizeof(*inodep), &next_block,
2466 +                                               &next_offset))
2467 +                                       goto failed_read;
2468 +
2469 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2470 +                               goto failed_read1;
2471 +
2472 +                       i->i_mode |= (inodeb->inode_type ==
2473 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
2474 +                                       S_IFBLK;
2475 +                       init_special_inode(i, i->i_mode, inodep->rdev);
2476 +
2477 +                       TRACE("Device inode %x:%x, rdev %x\n",
2478 +                                       SQUASHFS_INODE_BLK(inode), offset,
2479 +                                       inodep->rdev);
2480 +                       break;
2481 +                }
2482 +                case SQUASHFS_FIFO_TYPE:
2483 +                case SQUASHFS_SOCKET_TYPE: {
2484 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2485 +                               goto failed_read1;
2486 +
2487 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
2488 +                                                       ? S_IFIFO : S_IFSOCK;
2489 +                       init_special_inode(i, i->i_mode, 0);
2490 +                       break;
2491 +                }
2492 +                default:
2493 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
2494 +                                       inodeb->inode_type);
2495 +                       goto failed_read1;
2496 +       }
2497 +
2498 +       insert_inode_hash(i);
2499 +       return i;
2500 +
2501 +failed_read:
2502 +       ERROR("Unable to read inode [%x:%x]\n", block, offset);
2503 +
2504 +failed_read1:
2505 +       return NULL;
2506 +}
2507 +
2508 +
2509 +static int get_dir_index_using_offset(struct super_block *s, long long
2510 +                               *next_block, unsigned int *next_offset,
2511 +                               long long index_start,
2512 +                               unsigned int index_offset, int i_count,
2513 +                               long long f_pos)
2514 +{
2515 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2516 +       struct squashfs_super_block *sblk = &msblk->sblk;
2517 +       int i, length = 0;
2518 +       struct squashfs_dir_index_2 index;
2519 +
2520 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
2521 +                                       i_count, (unsigned int) f_pos);
2522 +
2523 +       if (f_pos == 0)
2524 +               goto finish;
2525 +
2526 +       for (i = 0; i < i_count; i++) {
2527 +               if (msblk->swap) {
2528 +                       struct squashfs_dir_index_2 sindex;
2529 +                       squashfs_get_cached_block(s, (char *) &sindex,
2530 +                                       index_start, index_offset,
2531 +                                       sizeof(sindex), &index_start,
2532 +                                       &index_offset);
2533 +                       SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
2534 +               } else
2535 +                       squashfs_get_cached_block(s, (char *) &index,
2536 +                                       index_start, index_offset,
2537 +                                       sizeof(index), &index_start,
2538 +                                       &index_offset);
2539 +
2540 +               if (index.index > f_pos)
2541 +                       break;
2542 +
2543 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
2544 +                                       index.size + 1, &index_start,
2545 +                                       &index_offset);
2546 +
2547 +               length = index.index;
2548 +               *next_block = index.start_block + sblk->directory_table_start;
2549 +       }
2550 +
2551 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2552 +
2553 +finish:
2554 +       return length;
2555 +}
2556 +
2557 +
2558 +static int get_dir_index_using_name(struct super_block *s, long long
2559 +                               *next_block, unsigned int *next_offset,
2560 +                               long long index_start,
2561 +                               unsigned int index_offset, int i_count,
2562 +                               const char *name, int size)
2563 +{
2564 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2565 +       struct squashfs_super_block *sblk = &msblk->sblk;
2566 +       int i, length = 0;
2567 +       char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1];
2568 +       struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer;
2569 +       char str[SQUASHFS_NAME_LEN + 1];
2570 +
2571 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
2572 +
2573 +       strncpy(str, name, size);
2574 +       str[size] = '\0';
2575 +
2576 +       for (i = 0; i < i_count; i++) {
2577 +               if (msblk->swap) {
2578 +                       struct squashfs_dir_index_2 sindex;
2579 +                       squashfs_get_cached_block(s, (char *) &sindex,
2580 +                                       index_start, index_offset,
2581 +                                       sizeof(sindex), &index_start,
2582 +                                       &index_offset);
2583 +                       SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
2584 +               } else
2585 +                       squashfs_get_cached_block(s, (char *) index,
2586 +                                       index_start, index_offset,
2587 +                                       sizeof(struct squashfs_dir_index_2),
2588 +                                       &index_start, &index_offset);
2589 +
2590 +               squashfs_get_cached_block(s, index->name, index_start,
2591 +                                       index_offset, index->size + 1,
2592 +                                       &index_start, &index_offset);
2593 +
2594 +               index->name[index->size + 1] = '\0';
2595 +
2596 +               if (strcmp(index->name, str) > 0)
2597 +                       break;
2598 +
2599 +               length = index->index;
2600 +               *next_block = index->start_block + sblk->directory_table_start;
2601 +       }
2602 +
2603 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2604 +       return length;
2605 +}
2606 +
2607 +
2608 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
2609 +{
2610 +       struct inode *i = file->f_dentry->d_inode;
2611 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
2612 +       struct squashfs_super_block *sblk = &msblk->sblk;
2613 +       long long next_block = SQUASHFS_I(i)->start_block +
2614 +               sblk->directory_table_start;
2615 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
2616 +               dir_count;
2617 +       struct squashfs_dir_header_2 dirh;
2618 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1];
2619 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2620 +
2621 +       TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
2622 +
2623 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
2624 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2625 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2626 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
2627 +                               file->f_pos);
2628 +
2629 +       while (length < i_size_read(i)) {
2630 +               /* read directory header */
2631 +               if (msblk->swap) {
2632 +                       struct squashfs_dir_header_2 sdirh;
2633 +
2634 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2635 +                                       next_block, next_offset, sizeof(sdirh),
2636 +                                       &next_block, &next_offset))
2637 +                               goto failed_read;
2638 +
2639 +                       length += sizeof(sdirh);
2640 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2641 +               } else {
2642 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2643 +                                       next_block, next_offset, sizeof(dirh),
2644 +                                       &next_block, &next_offset))
2645 +                               goto failed_read;
2646 +
2647 +                       length += sizeof(dirh);
2648 +               }
2649 +
2650 +               dir_count = dirh.count + 1;
2651 +               while (dir_count--) {
2652 +                       if (msblk->swap) {
2653 +                               struct squashfs_dir_entry_2 sdire;
2654 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2655 +                                               &sdire, next_block, next_offset,
2656 +                                               sizeof(sdire), &next_block,
2657 +                                               &next_offset))
2658 +                                       goto failed_read;
2659 +
2660 +                               length += sizeof(sdire);
2661 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2662 +                       } else {
2663 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2664 +                                               dire, next_block, next_offset,
2665 +                                               sizeof(*dire), &next_block,
2666 +                                               &next_offset))
2667 +                                       goto failed_read;
2668 +
2669 +                               length += sizeof(*dire);
2670 +                       }
2671 +
2672 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2673 +                                               next_block, next_offset,
2674 +                                               dire->size + 1, &next_block,
2675 +                                               &next_offset))
2676 +                               goto failed_read;
2677 +
2678 +                       length += dire->size + 1;
2679 +
2680 +                       if (file->f_pos >= length)
2681 +                               continue;
2682 +
2683 +                       dire->name[dire->size + 1] = '\0';
2684 +
2685 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
2686 +                                       (unsigned int) dirent, dire->name,
2687 +                                       dire->size + 1, (int) file->f_pos,
2688 +                                       dirh.start_block, dire->offset,
2689 +                                       squashfs_filetype_table[dire->type]);
2690 +
2691 +                       if (filldir(dirent, dire->name, dire->size + 1,
2692 +                                       file->f_pos, SQUASHFS_MK_VFS_INODE(
2693 +                                       dirh.start_block, dire->offset),
2694 +                                       squashfs_filetype_table[dire->type])
2695 +                                       < 0) {
2696 +                               TRACE("Filldir returned less than 0\n");
2697 +                               goto finish;
2698 +                       }
2699 +                       file->f_pos = length;
2700 +                       dirs_read++;
2701 +               }
2702 +       }
2703 +
2704 +finish:
2705 +       return dirs_read;
2706 +
2707 +failed_read:
2708 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2709 +               next_offset);
2710 +       return 0;
2711 +}
2712 +
2713 +
2714 +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry)
2715 +{
2716 +       const unsigned char *name = dentry->d_name.name;
2717 +       int len = dentry->d_name.len;
2718 +       struct inode *inode = NULL;
2719 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
2720 +       struct squashfs_super_block *sblk = &msblk->sblk;
2721 +       long long next_block = SQUASHFS_I(i)->start_block +
2722 +                               sblk->directory_table_start;
2723 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
2724 +                               dir_count;
2725 +       struct squashfs_dir_header_2 dirh;
2726 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN];
2727 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2728 +       int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
2729 +
2730 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
2731 +
2732 +       if (len > SQUASHFS_NAME_LEN)
2733 +               goto exit_loop;
2734 +
2735 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
2736 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2737 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2738 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
2739 +                               len);
2740 +
2741 +       while (length < i_size_read(i)) {
2742 +               /* read directory header */
2743 +               if (msblk->swap) {
2744 +                       struct squashfs_dir_header_2 sdirh;
2745 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2746 +                                       next_block, next_offset, sizeof(sdirh),
2747 +                                       &next_block, &next_offset))
2748 +                               goto failed_read;
2749 +
2750 +                       length += sizeof(sdirh);
2751 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2752 +               } else {
2753 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2754 +                                       next_block, next_offset, sizeof(dirh),
2755 +                                       &next_block, &next_offset))
2756 +                               goto failed_read;
2757 +
2758 +                       length += sizeof(dirh);
2759 +               }
2760 +
2761 +               dir_count = dirh.count + 1;
2762 +               while (dir_count--) {
2763 +                       if (msblk->swap) {
2764 +                               struct squashfs_dir_entry_2 sdire;
2765 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2766 +                                               &sdire, next_block,next_offset,
2767 +                                               sizeof(sdire), &next_block,
2768 +                                               &next_offset))
2769 +                                       goto failed_read;
2770 +
2771 +                               length += sizeof(sdire);
2772 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2773 +                       } else {
2774 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2775 +                                               dire, next_block,next_offset,
2776 +                                               sizeof(*dire), &next_block,
2777 +                                               &next_offset))
2778 +                                       goto failed_read;
2779 +
2780 +                               length += sizeof(*dire);
2781 +                       }
2782 +
2783 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2784 +                                       next_block, next_offset, dire->size + 1,
2785 +                                       &next_block, &next_offset))
2786 +                               goto failed_read;
2787 +
2788 +                       length += dire->size + 1;
2789 +
2790 +                       if (sorted && name[0] < dire->name[0])
2791 +                               goto exit_loop;
2792 +
2793 +                       if ((len == dire->size + 1) && !strncmp(name,
2794 +                                               dire->name, len)) {
2795 +                               squashfs_inode_t ino =
2796 +                                       SQUASHFS_MKINODE(dirh.start_block,
2797 +                                       dire->offset);
2798 +
2799 +                               TRACE("calling squashfs_iget for directory "
2800 +                                       "entry %s, inode %x:%x, %d\n", name,
2801 +                                       dirh.start_block, dire->offset, ino);
2802 +
2803 +                               inode = (msblk->iget)(i->i_sb, ino);
2804 +
2805 +                               goto exit_loop;
2806 +                       }
2807 +               }
2808 +       }
2809 +
2810 +exit_loop:
2811 +       d_add(dentry, inode);
2812 +       return ERR_PTR(0);
2813 +
2814 +failed_read:
2815 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2816 +               next_offset);
2817 +       goto exit_loop;
2818 +}
2819 +
2820 +
2821 +int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
2822 +{
2823 +       struct squashfs_super_block *sblk = &msblk->sblk;
2824 +
2825 +       msblk->iget = squashfs_iget_2;
2826 +       msblk->read_fragment_index_table = read_fragment_index_table_2;
2827 +
2828 +       sblk->bytes_used = sblk->bytes_used_2;
2829 +       sblk->uid_start = sblk->uid_start_2;
2830 +       sblk->guid_start = sblk->guid_start_2;
2831 +       sblk->inode_table_start = sblk->inode_table_start_2;
2832 +       sblk->directory_table_start = sblk->directory_table_start_2;
2833 +       sblk->fragment_table_start = sblk->fragment_table_start_2;
2834 +
2835 +       return 1;
2836 +}
2837 Index: linux-2.4.35.4/fs/squashfs/squashfs.h
2838 ===================================================================
2839 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
2840 +++ linux-2.4.35.4/fs/squashfs/squashfs.h       2007-12-15 05:19:48.659193968 +0100
2841 @@ -0,0 +1,85 @@
2842 +/*
2843 + * Squashfs - a compressed read only filesystem for Linux
2844 + *
2845 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2846 + * Phillip Lougher <phillip@lougher.org.uk>
2847 + *
2848 + * This program is free software; you can redistribute it and/or
2849 + * modify it under the terms of the GNU General Public License
2850 + * as published by the Free Software Foundation; either version 2,
2851 + * or (at your option) any later version.
2852 + *
2853 + * This program is distributed in the hope that it will be useful,
2854 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2855 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2856 + * GNU General Public License for more details.
2857 + *
2858 + * You should have received a copy of the GNU General Public License
2859 + * along with this program; if not, write to the Free Software
2860 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2861 + *
2862 + * squashfs.h
2863 + */
2864 +
2865 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
2866 +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
2867 +#endif
2868 +#ifdef SQUASHFS_TRACE
2869 +#define TRACE(s, args...)      printk(KERN_NOTICE "SQUASHFS: "s, ## args)
2870 +#else
2871 +#define TRACE(s, args...)      {}
2872 +#endif
2873 +
2874 +#define ERROR(s, args...)      printk(KERN_ERR "SQUASHFS error: "s, ## args)
2875 +
2876 +#define SERROR(s, args...)     do { \
2877 +                               if (!silent) \
2878 +                               printk(KERN_ERR "SQUASHFS error: "s, ## args);\
2879 +                               } while(0)
2880 +
2881 +#define WARNING(s, args...)    printk(KERN_WARNING "SQUASHFS: "s, ## args)
2882 +
2883 +#define SQUASHFS_I(INO)                        (&INO->u.squashfs_i)
2884 +
2885 +#define i_size_read(INO)               (INO->i_size)
2886 +
2887 +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
2888 +#define SQSH_EXTERN
2889 +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
2890 +                               long long index, unsigned int length,
2891 +                               long long *next_index);
2892 +extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
2893 +                               long long block, unsigned int offset,
2894 +                               int length, long long *next_block,
2895 +                               unsigned int *next_offset);
2896 +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
2897 +                                       squashfs_fragment_cache *fragment);
2898 +extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
2899 +                                       *s, long long start_block,
2900 +                                       int length);
2901 +extern struct address_space_operations squashfs_symlink_aops;
2902 +extern struct address_space_operations squashfs_aops;
2903 +extern struct address_space_operations squashfs_aops_4K;
2904 +extern struct file_operations squashfs_dir_ops;
2905 +extern struct inode_operations squashfs_dir_inode_ops;
2906 +#else
2907 +#define SQSH_EXTERN static
2908 +#endif
2909 +
2910 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
2911 +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
2912 +#else
2913 +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
2914 +{
2915 +       return 0;
2916 +}
2917 +#endif
2918 +
2919 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
2920 +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
2921 +#else
2922 +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
2923 +{
2924 +       return 0;
2925 +}
2926 +#endif
2927 Index: linux-2.4.35.4/include/linux/fs.h
2928 ===================================================================
2929 --- linux-2.4.35.4.orig/include/linux/fs.h      2007-12-15 05:19:42.794859778 +0100
2930 +++ linux-2.4.35.4/include/linux/fs.h   2007-12-15 05:19:48.663194197 +0100
2931 @@ -324,6 +324,7 @@
2932  #include <linux/usbdev_fs_i.h>
2933  #include <linux/jffs2_fs_i.h>
2934  #include <linux/cramfs_fs_sb.h>
2935 +#include <linux/squashfs_fs_i.h>
2936
2937  /*
2938   * Attribute flags.  These should be or-ed together to figure out what
2939 @@ -519,6 +520,7 @@
2940                 struct socket                   socket_i;
2941                 struct usbdev_inode_info        usbdev_i;
2942                 struct jffs2_inode_info         jffs2_i;
2943 +               struct squashfs_inode_info      squashfs_i;
2944                 void                            *generic_ip;
2945         } u;
2946  };
2947 @@ -734,6 +736,7 @@
2948  #include <linux/usbdev_fs_sb.h>
2949  #include <linux/cramfs_fs_sb.h>
2950  #include <linux/jffs2_fs_sb.h>
2951 +#include <linux/squashfs_fs_sb.h>
2952
2953  extern struct list_head super_blocks;
2954  extern spinlock_t sb_lock;
2955 @@ -793,6 +796,7 @@
2956                 struct usbdev_sb_info   usbdevfs_sb;
2957                 struct jffs2_sb_info    jffs2_sb;
2958                 struct cramfs_sb_info   cramfs_sb;
2959 +               struct squashfs_sb_info squashfs_sb;
2960                 void                    *generic_sbp;
2961         } u;
2962         /*
2963 Index: linux-2.4.35.4/include/linux/squashfs_fs.h
2964 ===================================================================
2965 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
2966 +++ linux-2.4.35.4/include/linux/squashfs_fs.h  2007-12-15 05:19:48.663194197 +0100
2967 @@ -0,0 +1,915 @@
2968 +#ifndef SQUASHFS_FS
2969 +#define SQUASHFS_FS
2970 +
2971 +/*
2972 + * Squashfs
2973 + *
2974 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2975 + * Phillip Lougher <phillip@lougher.org.uk>
2976 + *
2977 + * This program is free software; you can redistribute it and/or
2978 + * modify it under the terms of the GNU General Public License
2979 + * as published by the Free Software Foundation; either version 2,
2980 + * or (at your option) any later version.
2981 + *
2982 + * This program is distributed in the hope that it will be useful,
2983 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2984 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2985 + * GNU General Public License for more details.
2986 + *
2987 + * You should have received a copy of the GNU General Public License
2988 + * along with this program; if not, write to the Free Software
2989 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2990 + *
2991 + * squashfs_fs.h
2992 + */
2993 +
2994 +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
2995 +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
2996 +#endif
2997 +
2998 +#ifdef CONFIG_SQUASHFS_VMALLOC
2999 +#define SQUASHFS_ALLOC(a)              vmalloc(a)
3000 +#define SQUASHFS_FREE(a)               vfree(a)
3001 +#else
3002 +#define SQUASHFS_ALLOC(a)              kmalloc(a, GFP_KERNEL)
3003 +#define SQUASHFS_FREE(a)               kfree(a)
3004 +#endif
3005 +#ifdef CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
3006 +#define SQUASHFS_CACHED_FRAGMENTS      CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
3007 +#else
3008 +#define SQUASHFS_CACHED_FRAGMENTS      3
3009 +#endif
3010 +#define SQUASHFS_MAJOR                 3
3011 +#define SQUASHFS_MINOR                 0
3012 +#define SQUASHFS_MAGIC                 0x73717368
3013 +#define SQUASHFS_MAGIC_SWAP            0x68737173
3014 +#define SQUASHFS_START                 0
3015 +
3016 +/* size of metadata (inode and directory) blocks */
3017 +#define SQUASHFS_METADATA_SIZE         8192
3018 +#define SQUASHFS_METADATA_LOG          13
3019 +
3020 +/* default size of data blocks */
3021 +#define SQUASHFS_FILE_SIZE             65536
3022 +#define SQUASHFS_FILE_LOG              16
3023 +
3024 +#define SQUASHFS_FILE_MAX_SIZE         65536
3025 +
3026 +/* Max number of uids and gids */
3027 +#define SQUASHFS_UIDS                  256
3028 +#define SQUASHFS_GUIDS                 255
3029 +
3030 +/* Max length of filename (not 255) */
3031 +#define SQUASHFS_NAME_LEN              256
3032 +
3033 +#define SQUASHFS_INVALID               ((long long) 0xffffffffffff)
3034 +#define SQUASHFS_INVALID_FRAG          ((unsigned int) 0xffffffff)
3035 +#define SQUASHFS_INVALID_BLK           ((long long) -1)
3036 +#define SQUASHFS_USED_BLK              ((long long) -2)
3037 +
3038 +/* Filesystem flags */
3039 +#define SQUASHFS_NOI                   0
3040 +#define SQUASHFS_NOD                   1
3041 +#define SQUASHFS_CHECK                 2
3042 +#define SQUASHFS_NOF                   3
3043 +#define SQUASHFS_NO_FRAG               4
3044 +#define SQUASHFS_ALWAYS_FRAG           5
3045 +#define SQUASHFS_DUPLICATE             6
3046 +
3047 +#define SQUASHFS_BIT(flag, bit)                ((flag >> bit) & 1)
3048 +
3049 +#define SQUASHFS_UNCOMPRESSED_INODES(flags)    SQUASHFS_BIT(flags, \
3050 +                                               SQUASHFS_NOI)
3051 +
3052 +#define SQUASHFS_UNCOMPRESSED_DATA(flags)      SQUASHFS_BIT(flags, \
3053 +                                               SQUASHFS_NOD)
3054 +
3055 +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
3056 +                                               SQUASHFS_NOF)
3057 +
3058 +#define SQUASHFS_NO_FRAGMENTS(flags)           SQUASHFS_BIT(flags, \
3059 +                                               SQUASHFS_NO_FRAG)
3060 +
3061 +#define SQUASHFS_ALWAYS_FRAGMENTS(flags)       SQUASHFS_BIT(flags, \
3062 +                                               SQUASHFS_ALWAYS_FRAG)
3063 +
3064 +#define SQUASHFS_DUPLICATES(flags)             SQUASHFS_BIT(flags, \
3065 +                                               SQUASHFS_DUPLICATE)
3066 +
3067 +#define SQUASHFS_CHECK_DATA(flags)             SQUASHFS_BIT(flags, \
3068 +                                               SQUASHFS_CHECK)
3069 +
3070 +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
3071 +               duplicate_checking)     (noi | (nod << 1) | (check_data << 2) \
3072 +               | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
3073 +               (duplicate_checking << 6))
3074 +
3075 +/* Max number of types and file types */
3076 +#define SQUASHFS_DIR_TYPE              1
3077 +#define SQUASHFS_FILE_TYPE             2
3078 +#define SQUASHFS_SYMLINK_TYPE          3
3079 +#define SQUASHFS_BLKDEV_TYPE           4
3080 +#define SQUASHFS_CHRDEV_TYPE           5
3081 +#define SQUASHFS_FIFO_TYPE             6
3082 +#define SQUASHFS_SOCKET_TYPE           7
3083 +#define SQUASHFS_LDIR_TYPE             8
3084 +#define SQUASHFS_LREG_TYPE             9
3085 +
3086 +/* 1.0 filesystem type definitions */
3087 +#define SQUASHFS_TYPES                 5
3088 +#define SQUASHFS_IPC_TYPE              0
3089 +
3090 +/* Flag whether block is compressed or uncompressed, bit is set if block is
3091 + * uncompressed */
3092 +#define SQUASHFS_COMPRESSED_BIT                (1 << 15)
3093 +
3094 +#define SQUASHFS_COMPRESSED_SIZE(B)    (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
3095 +               (B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)
3096 +
3097 +#define SQUASHFS_COMPRESSED(B)         (!((B) & SQUASHFS_COMPRESSED_BIT))
3098 +
3099 +#define SQUASHFS_COMPRESSED_BIT_BLOCK          (1 << 24)
3100 +
3101 +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)      (((B) & \
3102 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
3103 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
3104 +
3105 +#define SQUASHFS_COMPRESSED_BLOCK(B)   (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
3106 +
3107 +/*
3108 + * Inode number ops.  Inodes consist of a compressed block number, and an
3109 + * uncompressed  offset within that block
3110 + */
3111 +#define SQUASHFS_INODE_BLK(a)          ((unsigned int) ((a) >> 16))
3112 +
3113 +#define SQUASHFS_INODE_OFFSET(a)       ((unsigned int) ((a) & 0xffff))
3114 +
3115 +#define SQUASHFS_MKINODE(A, B)         ((squashfs_inode_t)(((squashfs_inode_t) (A)\
3116 +                                       << 16) + (B)))
3117 +
3118 +/* Compute 32 bit VFS inode number from squashfs inode number */
3119 +#define SQUASHFS_MK_VFS_INODE(a, b)    ((unsigned int) (((a) << 8) + \
3120 +                                       ((b) >> 2) + 1))
3121 +/* XXX */
3122 +
3123 +/* Translate between VFS mode and squashfs mode */
3124 +#define SQUASHFS_MODE(a)               ((a) & 0xfff)
3125 +
3126 +/* fragment and fragment table defines */
3127 +#define SQUASHFS_FRAGMENT_BYTES(A)     (A * sizeof(struct squashfs_fragment_entry))
3128 +
3129 +#define SQUASHFS_FRAGMENT_INDEX(A)     (SQUASHFS_FRAGMENT_BYTES(A) / \
3130 +                                       SQUASHFS_METADATA_SIZE)
3131 +
3132 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)      (SQUASHFS_FRAGMENT_BYTES(A) % \
3133 +                                               SQUASHFS_METADATA_SIZE)
3134 +
3135 +#define SQUASHFS_FRAGMENT_INDEXES(A)   ((SQUASHFS_FRAGMENT_BYTES(A) + \
3136 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3137 +                                       SQUASHFS_METADATA_SIZE)
3138 +
3139 +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)       (SQUASHFS_FRAGMENT_INDEXES(A) *\
3140 +                                               sizeof(long long))
3141 +
3142 +/* cached data constants for filesystem */
3143 +#define SQUASHFS_CACHED_BLKS           8
3144 +
3145 +#define SQUASHFS_MAX_FILE_SIZE_LOG     64
3146 +
3147 +#define SQUASHFS_MAX_FILE_SIZE         ((long long) 1 << \
3148 +                                       (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
3149 +
3150 +#define SQUASHFS_MARKER_BYTE           0xff
3151 +
3152 +/* meta index cache */
3153 +#define SQUASHFS_META_INDEXES  (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
3154 +#define SQUASHFS_META_ENTRIES  31
3155 +#define SQUASHFS_META_NUMBER   8
3156 +#define SQUASHFS_SLOTS         4
3157 +
3158 +struct meta_entry {
3159 +       long long               data_block;
3160 +       unsigned int            index_block;
3161 +       unsigned short          offset;
3162 +       unsigned short          pad;
3163 +};
3164 +
3165 +struct meta_index {
3166 +       unsigned int            inode_number;
3167 +       unsigned int            offset;
3168 +       unsigned short          entries;
3169 +       unsigned short          skip;
3170 +       unsigned short          locked;
3171 +       unsigned short          pad;
3172 +       struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
3173 +};
3174 +
3175 +
3176 +/*
3177 + * definitions for structures on disk
3178 + */
3179 +
3180 +typedef long long              squashfs_block_t;
3181 +typedef long long              squashfs_inode_t;
3182 +
3183 +struct squashfs_super_block {
3184 +       unsigned int            s_magic;
3185 +       unsigned int            inodes;
3186 +       unsigned int            bytes_used_2;
3187 +       unsigned int            uid_start_2;
3188 +       unsigned int            guid_start_2;
3189 +       unsigned int            inode_table_start_2;
3190 +       unsigned int            directory_table_start_2;
3191 +       unsigned int            s_major:16;
3192 +       unsigned int            s_minor:16;
3193 +       unsigned int            block_size_1:16;
3194 +       unsigned int            block_log:16;
3195 +       unsigned int            flags:8;
3196 +       unsigned int            no_uids:8;
3197 +       unsigned int            no_guids:8;
3198 +       unsigned int            mkfs_time /* time of filesystem creation */;
3199 +       squashfs_inode_t        root_inode;
3200 +       unsigned int            block_size;
3201 +       unsigned int            fragments;
3202 +       unsigned int            fragment_table_start_2;
3203 +       long long               bytes_used;
3204 +       long long               uid_start;
3205 +       long long               guid_start;
3206 +       long long               inode_table_start;
3207 +       long long               directory_table_start;
3208 +       long long               fragment_table_start;
3209 +       long long               unused;
3210 +} __attribute__ ((packed));
3211 +
3212 +struct squashfs_dir_index {
3213 +       unsigned int            index;
3214 +       unsigned int            start_block;
3215 +       unsigned char           size;
3216 +       unsigned char           name[0];
3217 +} __attribute__ ((packed));
3218 +
3219 +#define SQUASHFS_BASE_INODE_HEADER             \
3220 +       unsigned int            inode_type:4;   \
3221 +       unsigned int            mode:12;        \
3222 +       unsigned int            uid:8;          \
3223 +       unsigned int            guid:8;         \
3224 +       unsigned int            mtime;          \
3225 +       unsigned int            inode_number;
3226 +
3227 +struct squashfs_base_inode_header {
3228 +       SQUASHFS_BASE_INODE_HEADER;
3229 +} __attribute__ ((packed));
3230 +
3231 +struct squashfs_ipc_inode_header {
3232 +       SQUASHFS_BASE_INODE_HEADER;
3233 +       unsigned int            nlink;
3234 +} __attribute__ ((packed));
3235 +
3236 +struct squashfs_dev_inode_header {
3237 +       SQUASHFS_BASE_INODE_HEADER;
3238 +       unsigned int            nlink;
3239 +       unsigned short          rdev;
3240 +} __attribute__ ((packed));
3241 +
3242 +struct squashfs_symlink_inode_header {
3243 +       SQUASHFS_BASE_INODE_HEADER;
3244 +       unsigned int            nlink;
3245 +       unsigned short          symlink_size;
3246 +       char                    symlink[0];
3247 +} __attribute__ ((packed));
3248 +
3249 +struct squashfs_reg_inode_header {
3250 +       SQUASHFS_BASE_INODE_HEADER;
3251 +       squashfs_block_t        start_block;
3252 +       unsigned int            fragment;
3253 +       unsigned int            offset;
3254 +       unsigned int            file_size;
3255 +       unsigned short          block_list[0];
3256 +} __attribute__ ((packed));
3257 +
3258 +struct squashfs_lreg_inode_header {
3259 +       SQUASHFS_BASE_INODE_HEADER;
3260 +       unsigned int            nlink;
3261 +       squashfs_block_t        start_block;
3262 +       unsigned int            fragment;
3263 +       unsigned int            offset;
3264 +       long long               file_size;
3265 +       unsigned short          block_list[0];
3266 +} __attribute__ ((packed));
3267 +
3268 +struct squashfs_dir_inode_header {
3269 +       SQUASHFS_BASE_INODE_HEADER;
3270 +       unsigned int            nlink;
3271 +       unsigned int            file_size:19;
3272 +       unsigned int            offset:13;
3273 +       unsigned int            start_block;
3274 +       unsigned int            parent_inode;
3275 +} __attribute__  ((packed));
3276 +
3277 +struct squashfs_ldir_inode_header {
3278 +       SQUASHFS_BASE_INODE_HEADER;
3279 +       unsigned int            nlink;
3280 +       unsigned int            file_size:27;
3281 +       unsigned int            offset:13;
3282 +       unsigned int            start_block;
3283 +       unsigned int            i_count:16;
3284 +       unsigned int            parent_inode;
3285 +       struct squashfs_dir_index       index[0];
3286 +} __attribute__  ((packed));
3287 +
3288 +union squashfs_inode_header {
3289 +       struct squashfs_base_inode_header       base;
3290 +       struct squashfs_dev_inode_header        dev;
3291 +       struct squashfs_symlink_inode_header    symlink;
3292 +       struct squashfs_reg_inode_header        reg;
3293 +       struct squashfs_lreg_inode_header       lreg;
3294 +       struct squashfs_dir_inode_header        dir;
3295 +       struct squashfs_ldir_inode_header       ldir;
3296 +       struct squashfs_ipc_inode_header        ipc;
3297 +};
3298 +
3299 +struct squashfs_dir_entry {
3300 +       unsigned int            offset:13;
3301 +       unsigned int            type:3;
3302 +       unsigned int            size:8;
3303 +       int                     inode_number:16;
3304 +       char                    name[0];
3305 +} __attribute__ ((packed));
3306 +
3307 +struct squashfs_dir_header {
3308 +       unsigned int            count:8;
3309 +       unsigned int            start_block;
3310 +       unsigned int            inode_number;
3311 +} __attribute__ ((packed));
3312 +
3313 +struct squashfs_fragment_entry {
3314 +       long long               start_block;
3315 +       unsigned int            size;
3316 +       unsigned int            unused;
3317 +} __attribute__ ((packed));
3318 +
3319 +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
3320 +extern int squashfs_uncompress_init(void);
3321 +extern int squashfs_uncompress_exit(void);
3322 +
3323 +/*
3324 + * macros to convert each packed bitfield structure from little endian to big
3325 + * endian and vice versa.  These are needed when creating or using a filesystem
3326 + * on a machine with different byte ordering to the target architecture.
3327 + *
3328 + */
3329 +
3330 +#define SQUASHFS_SWAP_START \
3331 +       int bits;\
3332 +       int b_pos;\
3333 +       unsigned long long val;\
3334 +       unsigned char *s;\
3335 +       unsigned char *d;
3336 +
3337 +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
3338 +       SQUASHFS_SWAP_START\
3339 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
3340 +       SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
3341 +       SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
3342 +       SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
3343 +       SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
3344 +       SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
3345 +       SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
3346 +       SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
3347 +       SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
3348 +       SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
3349 +       SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\
3350 +       SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
3351 +       SQUASHFS_SWAP((s)->flags, d, 288, 8);\
3352 +       SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
3353 +       SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
3354 +       SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
3355 +       SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
3356 +       SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
3357 +       SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
3358 +       SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
3359 +       SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
3360 +       SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
3361 +       SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
3362 +       SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
3363 +       SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
3364 +       SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
3365 +       SQUASHFS_SWAP((s)->unused, d, 888, 64);\
3366 +}
3367 +
3368 +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3369 +       SQUASHFS_MEMSET(s, d, n);\
3370 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3371 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3372 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3373 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3374 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3375 +       SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
3376 +
3377 +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
3378 +       SQUASHFS_SWAP_START\
3379 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3380 +}
3381 +
3382 +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
3383 +       SQUASHFS_SWAP_START\
3384 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3385 +                       sizeof(struct squashfs_ipc_inode_header))\
3386 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3387 +}
3388 +
3389 +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
3390 +       SQUASHFS_SWAP_START\
3391 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3392 +                       sizeof(struct squashfs_dev_inode_header)); \
3393 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3394 +       SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
3395 +}
3396 +
3397 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
3398 +       SQUASHFS_SWAP_START\
3399 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3400 +                       sizeof(struct squashfs_symlink_inode_header));\
3401 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3402 +       SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
3403 +}
3404 +
3405 +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
3406 +       SQUASHFS_SWAP_START\
3407 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3408 +                       sizeof(struct squashfs_reg_inode_header));\
3409 +       SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
3410 +       SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
3411 +       SQUASHFS_SWAP((s)->offset, d, 192, 32);\
3412 +       SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
3413 +}
3414 +
3415 +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
3416 +       SQUASHFS_SWAP_START\
3417 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3418 +                       sizeof(struct squashfs_lreg_inode_header));\
3419 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3420 +       SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
3421 +       SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
3422 +       SQUASHFS_SWAP((s)->offset, d, 224, 32);\
3423 +       SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
3424 +}
3425 +
3426 +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
3427 +       SQUASHFS_SWAP_START\
3428 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3429 +                       sizeof(struct squashfs_dir_inode_header));\
3430 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3431 +       SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
3432 +       SQUASHFS_SWAP((s)->offset, d, 147, 13);\
3433 +       SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
3434 +       SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
3435 +}
3436 +
3437 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
3438 +       SQUASHFS_SWAP_START\
3439 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3440 +                       sizeof(struct squashfs_ldir_inode_header));\
3441 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3442 +       SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
3443 +       SQUASHFS_SWAP((s)->offset, d, 155, 13);\
3444 +       SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
3445 +       SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
3446 +       SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
3447 +}
3448 +
3449 +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
3450 +       SQUASHFS_SWAP_START\
3451 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
3452 +       SQUASHFS_SWAP((s)->index, d, 0, 32);\
3453 +       SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
3454 +       SQUASHFS_SWAP((s)->size, d, 64, 8);\
3455 +}
3456 +
3457 +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
3458 +       SQUASHFS_SWAP_START\
3459 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
3460 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3461 +       SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
3462 +       SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
3463 +}
3464 +
3465 +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
3466 +       SQUASHFS_SWAP_START\
3467 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
3468 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3469 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3470 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3471 +       SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
3472 +}
3473 +
3474 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
3475 +       SQUASHFS_SWAP_START\
3476 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
3477 +       SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
3478 +       SQUASHFS_SWAP((s)->size, d, 64, 32);\
3479 +}
3480 +
3481 +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
3482 +       int entry;\
3483 +       int bit_position;\
3484 +       SQUASHFS_SWAP_START\
3485 +       SQUASHFS_MEMSET(s, d, n * 2);\
3486 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3487 +                       16)\
3488 +               SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
3489 +}
3490 +
3491 +#define SQUASHFS_SWAP_INTS(s, d, n) {\
3492 +       int entry;\
3493 +       int bit_position;\
3494 +       SQUASHFS_SWAP_START\
3495 +       SQUASHFS_MEMSET(s, d, n * 4);\
3496 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3497 +                       32)\
3498 +               SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
3499 +}
3500 +
3501 +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
3502 +       int entry;\
3503 +       int bit_position;\
3504 +       SQUASHFS_SWAP_START\
3505 +       SQUASHFS_MEMSET(s, d, n * 8);\
3506 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3507 +                       64)\
3508 +               SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
3509 +}
3510 +
3511 +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
3512 +       int entry;\
3513 +       int bit_position;\
3514 +       SQUASHFS_SWAP_START\
3515 +       SQUASHFS_MEMSET(s, d, n * bits / 8);\
3516 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3517 +                       bits)\
3518 +               SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
3519 +}
3520 +
3521 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
3522 +
3523 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3524 +
3525 +struct squashfs_base_inode_header_1 {
3526 +       unsigned int            inode_type:4;
3527 +       unsigned int            mode:12; /* protection */
3528 +       unsigned int            uid:4; /* index into uid table */
3529 +       unsigned int            guid:4; /* index into guid table */
3530 +} __attribute__ ((packed));
3531 +
3532 +struct squashfs_ipc_inode_header_1 {
3533 +       unsigned int            inode_type:4;
3534 +       unsigned int            mode:12; /* protection */
3535 +       unsigned int            uid:4; /* index into uid table */
3536 +       unsigned int            guid:4; /* index into guid table */
3537 +       unsigned int            type:4;
3538 +       unsigned int            offset:4;
3539 +} __attribute__ ((packed));
3540 +
3541 +struct squashfs_dev_inode_header_1 {
3542 +       unsigned int            inode_type:4;
3543 +       unsigned int            mode:12; /* protection */
3544 +       unsigned int            uid:4; /* index into uid table */
3545 +       unsigned int            guid:4; /* index into guid table */
3546 +       unsigned short          rdev;
3547 +} __attribute__ ((packed));
3548 +
3549 +struct squashfs_symlink_inode_header_1 {
3550 +       unsigned int            inode_type:4;
3551 +       unsigned int            mode:12; /* protection */
3552 +       unsigned int            uid:4; /* index into uid table */
3553 +       unsigned int            guid:4; /* index into guid table */
3554 +       unsigned short          symlink_size;
3555 +       char                    symlink[0];
3556 +} __attribute__ ((packed));
3557 +
3558 +struct squashfs_reg_inode_header_1 {
3559 +       unsigned int            inode_type:4;
3560 +       unsigned int            mode:12; /* protection */
3561 +       unsigned int            uid:4; /* index into uid table */
3562 +       unsigned int            guid:4; /* index into guid table */
3563 +       unsigned int            mtime;
3564 +       unsigned int            start_block;
3565 +       unsigned int            file_size:32;
3566 +       unsigned short          block_list[0];
3567 +} __attribute__ ((packed));
3568 +
3569 +struct squashfs_dir_inode_header_1 {
3570 +       unsigned int            inode_type:4;
3571 +       unsigned int            mode:12; /* protection */
3572 +       unsigned int            uid:4; /* index into uid table */
3573 +       unsigned int            guid:4; /* index into guid table */
3574 +       unsigned int            file_size:19;
3575 +       unsigned int            offset:13;
3576 +       unsigned int            mtime;
3577 +       unsigned int            start_block:24;
3578 +} __attribute__  ((packed));
3579 +
3580 +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \
3581 +       SQUASHFS_MEMSET(s, d, n);\
3582 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3583 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3584 +       SQUASHFS_SWAP((s)->uid, d, 16, 4);\
3585 +       SQUASHFS_SWAP((s)->guid, d, 20, 4);
3586 +
3587 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
3588 +       SQUASHFS_SWAP_START\
3589 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
3590 +}
3591 +
3592 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
3593 +       SQUASHFS_SWAP_START\
3594 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3595 +                       sizeof(struct squashfs_ipc_inode_header_1));\
3596 +       SQUASHFS_SWAP((s)->type, d, 24, 4);\
3597 +       SQUASHFS_SWAP((s)->offset, d, 28, 4);\
3598 +}
3599 +
3600 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
3601 +       SQUASHFS_SWAP_START\
3602 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3603 +                       sizeof(struct squashfs_dev_inode_header_1));\
3604 +       SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
3605 +}
3606 +
3607 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
3608 +       SQUASHFS_SWAP_START\
3609 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3610 +                       sizeof(struct squashfs_symlink_inode_header_1));\
3611 +       SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
3612 +}
3613 +
3614 +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
3615 +       SQUASHFS_SWAP_START\
3616 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3617 +                       sizeof(struct squashfs_reg_inode_header_1));\
3618 +       SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
3619 +       SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
3620 +       SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
3621 +}
3622 +
3623 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
3624 +       SQUASHFS_SWAP_START\
3625 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3626 +                       sizeof(struct squashfs_dir_inode_header_1));\
3627 +       SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
3628 +       SQUASHFS_SWAP((s)->offset, d, 43, 13);\
3629 +       SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
3630 +       SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
3631 +}
3632 +
3633 +#endif
3634 +
3635 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3636 +
3637 +struct squashfs_dir_index_2 {
3638 +       unsigned int            index:27;
3639 +       unsigned int            start_block:29;
3640 +       unsigned char           size;
3641 +       unsigned char           name[0];
3642 +} __attribute__ ((packed));
3643 +
3644 +struct squashfs_base_inode_header_2 {
3645 +       unsigned int            inode_type:4;
3646 +       unsigned int            mode:12; /* protection */
3647 +       unsigned int            uid:8; /* index into uid table */
3648 +       unsigned int            guid:8; /* index into guid table */
3649 +} __attribute__ ((packed));
3650 +
3651 +struct squashfs_ipc_inode_header_2 {
3652 +       unsigned int            inode_type:4;
3653 +       unsigned int            mode:12; /* protection */
3654 +       unsigned int            uid:8; /* index into uid table */
3655 +       unsigned int            guid:8; /* index into guid table */
3656 +} __attribute__ ((packed));
3657 +
3658 +struct squashfs_dev_inode_header_2 {
3659 +       unsigned int            inode_type:4;
3660 +       unsigned int            mode:12; /* protection */
3661 +       unsigned int            uid:8; /* index into uid table */
3662 +       unsigned int            guid:8; /* index into guid table */
3663 +       unsigned short          rdev;
3664 +} __attribute__ ((packed));
3665 +
3666 +struct squashfs_symlink_inode_header_2 {
3667 +       unsigned int            inode_type:4;
3668 +       unsigned int            mode:12; /* protection */
3669 +       unsigned int            uid:8; /* index into uid table */
3670 +       unsigned int            guid:8; /* index into guid table */
3671 +       unsigned short          symlink_size;
3672 +       char                    symlink[0];
3673 +} __attribute__ ((packed));
3674 +
3675 +struct squashfs_reg_inode_header_2 {
3676 +       unsigned int            inode_type:4;
3677 +       unsigned int            mode:12; /* protection */
3678 +       unsigned int            uid:8; /* index into uid table */
3679 +       unsigned int            guid:8; /* index into guid table */
3680 +       unsigned int            mtime;
3681 +       unsigned int            start_block;
3682 +       unsigned int            fragment;
3683 +       unsigned int            offset;
3684 +       unsigned int            file_size:32;
3685 +       unsigned short          block_list[0];
3686 +} __attribute__ ((packed));
3687 +
3688 +struct squashfs_dir_inode_header_2 {
3689 +       unsigned int            inode_type:4;
3690 +       unsigned int            mode:12; /* protection */
3691 +       unsigned int            uid:8; /* index into uid table */
3692 +       unsigned int            guid:8; /* index into guid table */
3693 +       unsigned int            file_size:19;
3694 +       unsigned int            offset:13;
3695 +       unsigned int            mtime;
3696 +       unsigned int            start_block:24;
3697 +} __attribute__  ((packed));
3698 +
3699 +struct squashfs_ldir_inode_header_2 {
3700 +       unsigned int            inode_type:4;
3701 +       unsigned int            mode:12; /* protection */
3702 +       unsigned int            uid:8; /* index into uid table */
3703 +       unsigned int            guid:8; /* index into guid table */
3704 +       unsigned int            file_size:27;
3705 +       unsigned int            offset:13;
3706 +       unsigned int            mtime;
3707 +       unsigned int            start_block:24;
3708 +       unsigned int            i_count:16;
3709 +       struct squashfs_dir_index_2     index[0];
3710 +} __attribute__  ((packed));
3711 +
3712 +union squashfs_inode_header_2 {
3713 +       struct squashfs_base_inode_header_2     base;
3714 +       struct squashfs_dev_inode_header_2      dev;
3715 +       struct squashfs_symlink_inode_header_2  symlink;
3716 +       struct squashfs_reg_inode_header_2      reg;
3717 +       struct squashfs_dir_inode_header_2      dir;
3718 +       struct squashfs_ldir_inode_header_2     ldir;
3719 +       struct squashfs_ipc_inode_header_2      ipc;
3720 +};
3721 +
3722 +struct squashfs_dir_header_2 {
3723 +       unsigned int            count:8;
3724 +       unsigned int            start_block:24;
3725 +} __attribute__ ((packed));
3726 +
3727 +struct squashfs_dir_entry_2 {
3728 +       unsigned int            offset:13;
3729 +       unsigned int            type:3;
3730 +       unsigned int            size:8;
3731 +       char                    name[0];
3732 +} __attribute__ ((packed));
3733 +
3734 +struct squashfs_fragment_entry_2 {
3735 +       unsigned int            start_block;
3736 +       unsigned int            size;
3737 +} __attribute__ ((packed));
3738 +
3739 +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3740 +       SQUASHFS_MEMSET(s, d, n);\
3741 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3742 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3743 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3744 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3745 +
3746 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
3747 +       SQUASHFS_SWAP_START\
3748 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3749 +}
3750 +
3751 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
3752 +       SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
3753 +
3754 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
3755 +       SQUASHFS_SWAP_START\
3756 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3757 +                       sizeof(struct squashfs_dev_inode_header_2)); \
3758 +       SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
3759 +}
3760 +
3761 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
3762 +       SQUASHFS_SWAP_START\
3763 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3764 +                       sizeof(struct squashfs_symlink_inode_header_2));\
3765 +       SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
3766 +}
3767 +
3768 +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
3769 +       SQUASHFS_SWAP_START\
3770 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3771 +                       sizeof(struct squashfs_reg_inode_header_2));\
3772 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3773 +       SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
3774 +       SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
3775 +       SQUASHFS_SWAP((s)->offset, d, 128, 32);\
3776 +       SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
3777 +}
3778 +
3779 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
3780 +       SQUASHFS_SWAP_START\
3781 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3782 +                       sizeof(struct squashfs_dir_inode_header_2));\
3783 +       SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
3784 +       SQUASHFS_SWAP((s)->offset, d, 51, 13);\
3785 +       SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
3786 +       SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
3787 +}
3788 +
3789 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
3790 +       SQUASHFS_SWAP_START\
3791 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3792 +                       sizeof(struct squashfs_ldir_inode_header_2));\
3793 +       SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
3794 +       SQUASHFS_SWAP((s)->offset, d, 59, 13);\
3795 +       SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
3796 +       SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
3797 +       SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
3798 +}
3799 +
3800 +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
3801 +       SQUASHFS_SWAP_START\
3802 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
3803 +       SQUASHFS_SWAP((s)->index, d, 0, 27);\
3804 +       SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
3805 +       SQUASHFS_SWAP((s)->size, d, 56, 8);\
3806 +}
3807 +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
3808 +       SQUASHFS_SWAP_START\
3809 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
3810 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3811 +       SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
3812 +}
3813 +
3814 +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
3815 +       SQUASHFS_SWAP_START\
3816 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
3817 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3818 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3819 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3820 +}
3821 +
3822 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
3823 +       SQUASHFS_SWAP_START\
3824 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
3825 +       SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
3826 +       SQUASHFS_SWAP((s)->size, d, 32, 32);\
3827 +}
3828 +
3829 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
3830 +
3831 +/* fragment and fragment table defines */
3832 +#define SQUASHFS_FRAGMENT_BYTES_2(A)   (A * sizeof(struct squashfs_fragment_entry_2))
3833 +
3834 +#define SQUASHFS_FRAGMENT_INDEX_2(A)   (SQUASHFS_FRAGMENT_BYTES_2(A) / \
3835 +                                       SQUASHFS_METADATA_SIZE)
3836 +
3837 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A)    (SQUASHFS_FRAGMENT_BYTES_2(A) % \
3838 +                                               SQUASHFS_METADATA_SIZE)
3839 +
3840 +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \
3841 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3842 +                                       SQUASHFS_METADATA_SIZE)
3843 +
3844 +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A)     (SQUASHFS_FRAGMENT_INDEXES_2(A) *\
3845 +                                               sizeof(int))
3846 +
3847 +#endif
3848 +
3849 +#ifdef __KERNEL__
3850 +
3851 +/*
3852 + * macros used to swap each structure entry, taking into account
3853 + * bitfields and different bitfield placing conventions on differing
3854 + * architectures
3855 + */
3856 +
3857 +#include <asm/byteorder.h>
3858 +
3859 +#ifdef __BIG_ENDIAN
3860 +       /* convert from little endian to big endian */
3861 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3862 +               tbits, b_pos)
3863 +#else
3864 +       /* convert from big endian to little endian */
3865 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3866 +               tbits, 64 - tbits - b_pos)
3867 +#endif
3868 +
3869 +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
3870 +       b_pos = pos % 8;\
3871 +       val = 0;\
3872 +       s = (unsigned char *)p + (pos / 8);\
3873 +       d = ((unsigned char *) &val) + 7;\
3874 +       for(bits = 0; bits < (tbits + b_pos); bits += 8) \
3875 +               *d-- = *s++;\
3876 +       value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
3877 +}
3878 +
3879 +#define SQUASHFS_MEMSET(s, d, n)       memset(s, 0, n);
3880 +
3881 +#endif
3882 +#endif
3883 Index: linux-2.4.35.4/include/linux/squashfs_fs_i.h
3884 ===================================================================
3885 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
3886 +++ linux-2.4.35.4/include/linux/squashfs_fs_i.h        2007-12-15 05:19:48.663194197 +0100
3887 @@ -0,0 +1,44 @@
3888 +#ifndef SQUASHFS_FS_I
3889 +#define SQUASHFS_FS_I
3890 +/*
3891 + * Squashfs
3892 + *
3893 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3894 + * Phillip Lougher <phillip@lougher.org.uk>
3895 + *
3896 + * This program is free software; you can redistribute it and/or
3897 + * modify it under the terms of the GNU General Public License
3898 + * as published by the Free Software Foundation; either version 2,
3899 + * or (at your option) any later version.
3900 + *
3901 + * This program is distributed in the hope that it will be useful,
3902 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3903 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3904 + * GNU General Public License for more details.
3905 + *
3906 + * You should have received a copy of the GNU General Public License
3907 + * along with this program; if not, write to the Free Software
3908 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3909 + *
3910 + * squashfs_fs_i.h
3911 + */
3912 +
3913 +struct squashfs_inode_info {
3914 +       long long       start_block;
3915 +       unsigned int    offset;
3916 +       union {
3917 +               struct {
3918 +                       long long       fragment_start_block;
3919 +                       unsigned int    fragment_size;
3920 +                       unsigned int    fragment_offset;
3921 +                       long long       block_list_start;
3922 +               } s1;
3923 +               struct {
3924 +                       long long       directory_index_start;
3925 +                       unsigned int    directory_index_offset;
3926 +                       unsigned int    directory_index_count;
3927 +                       unsigned int    parent_inode;
3928 +               } s2;
3929 +       } u;
3930 +};
3931 +#endif
3932 Index: linux-2.4.35.4/include/linux/squashfs_fs_sb.h
3933 ===================================================================
3934 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
3935 +++ linux-2.4.35.4/include/linux/squashfs_fs_sb.h       2007-12-15 05:19:48.667194423 +0100
3936 @@ -0,0 +1,74 @@
3937 +#ifndef SQUASHFS_FS_SB
3938 +#define SQUASHFS_FS_SB
3939 +/*
3940 + * Squashfs
3941 + *
3942 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3943 + * Phillip Lougher <phillip@lougher.org.uk>
3944 + *
3945 + * This program is free software; you can redistribute it and/or
3946 + * modify it under the terms of the GNU General Public License
3947 + * as published by the Free Software Foundation; either version 2,
3948 + * or (at your option) any later version.
3949 + *
3950 + * This program is distributed in the hope that it will be useful,
3951 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3952 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3953 + * GNU General Public License for more details.
3954 + *
3955 + * You should have received a copy of the GNU General Public License
3956 + * along with this program; if not, write to the Free Software
3957 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3958 + *
3959 + * squashfs_fs_sb.h
3960 + */
3961 +
3962 +#include <linux/squashfs_fs.h>
3963 +
3964 +struct squashfs_cache {
3965 +       long long       block;
3966 +       int             length;
3967 +       long long       next_index;
3968 +       char            *data;
3969 +};
3970 +
3971 +struct squashfs_fragment_cache {
3972 +       long long       block;
3973 +       int             length;
3974 +       unsigned int    locked;
3975 +       char            *data;
3976 +};
3977 +
3978 +struct squashfs_sb_info {
3979 +       struct squashfs_super_block     sblk;
3980 +       int                     devblksize;
3981 +       int                     devblksize_log2;
3982 +       int                     swap;
3983 +       struct squashfs_cache   *block_cache;
3984 +       struct squashfs_fragment_cache  *fragment;
3985 +       int                     next_cache;
3986 +       int                     next_fragment;
3987 +       int                     next_meta_index;
3988 +       unsigned int            *uid;
3989 +       unsigned int            *guid;
3990 +       long long               *fragment_index;
3991 +       unsigned int            *fragment_index_2;
3992 +       unsigned int            read_size;
3993 +       char                    *read_data;
3994 +       char                    *read_page;
3995 +       struct semaphore        read_data_mutex;
3996 +       struct semaphore        read_page_mutex;
3997 +       struct semaphore        block_cache_mutex;
3998 +       struct semaphore        fragment_mutex;
3999 +       struct semaphore        meta_index_mutex;
4000 +       wait_queue_head_t       waitq;
4001 +       wait_queue_head_t       fragment_wait_queue;
4002 +       struct meta_index       *meta_index;
4003 +       struct inode            *(*iget)(struct super_block *s,  squashfs_inode_t \
4004 +                               inode);
4005 +       long long               (*read_blocklist)(struct inode *inode, int \
4006 +                               index, int readahead_blks, char *block_list, \
4007 +                               unsigned short **block_p, unsigned int *bsize);
4008 +       int                     (*read_fragment_index_table)(struct super_block *s);
4009 +};
4010 +#endif
4011 Index: linux-2.4.35.4/init/do_mounts.c
4012 ===================================================================
4013 --- linux-2.4.35.4.orig/init/do_mounts.c        2007-12-15 05:19:42.822861373 +0100
4014 +++ linux-2.4.35.4/init/do_mounts.c     2007-12-15 05:19:48.667194423 +0100
4015 @@ -15,6 +15,7 @@
4016  #include <linux/minix_fs.h>
4017  #include <linux/ext2_fs.h>
4018  #include <linux/romfs_fs.h>
4019 +#include <linux/squashfs_fs.h>
4020  #include <linux/cramfs_fs.h>
4021
4022  #define BUILD_CRAMDISK
4023 @@ -476,6 +477,7 @@
4024   *     minix
4025   *     ext2
4026   *     romfs
4027 + *     squashfs
4028   *     cramfs
4029   *     gzip
4030   */
4031 @@ -486,6 +488,7 @@
4032         struct minix_super_block *minixsb;
4033         struct ext2_super_block *ext2sb;
4034         struct romfs_super_block *romfsb;
4035 +       struct squashfs_super_block *squashfsb;
4036         struct cramfs_super *cramfsb;
4037         int nblocks = -1;
4038         unsigned char *buf;
4039 @@ -497,6 +500,7 @@
4040         minixsb = (struct minix_super_block *) buf;
4041         ext2sb = (struct ext2_super_block *) buf;
4042         romfsb = (struct romfs_super_block *) buf;
4043 +       squashfsb = (struct squashfs_super_block *) buf;
4044         cramfsb = (struct cramfs_super *) buf;
4045         memset(buf, 0xe5, size);
4046
4047 @@ -535,6 +539,15 @@
4048                 goto done;
4049         }
4050
4051 +       /* squashfs is at block zero too */
4052 +       if (squashfsb->s_magic == SQUASHFS_MAGIC) {
4053 +               printk(KERN_NOTICE
4054 +                      "RAMDISK: squashfs filesystem found at block %d\n",
4055 +                      start_block);
4056 +               nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
4057 +               goto done;
4058 +       }
4059 +
4060         /*
4061          * Read block 1 to test for minix and ext2 superblock
4062          */
4063 Index: linux-2.4.35.4/lib/Config.in
4064 ===================================================================
4065 --- linux-2.4.35.4.orig/lib/Config.in   2007-12-15 05:19:42.830861829 +0100
4066 +++ linux-2.4.35.4/lib/Config.in        2007-12-15 05:19:48.667194423 +0100
4067 @@ -10,6 +10,7 @@
4068  # Do we need the compression support?
4069  #
4070  if [ "$CONFIG_CRAMFS" = "y" -o \
4071 +     "$CONFIG_SQUASHFS" = "y" -o \
4072       "$CONFIG_PPP_DEFLATE" = "y" -o \
4073       "$CONFIG_CRYPTO_DEFLATE" = "y" -o \
4074       "$CONFIG_JFFS2_FS" = "y" -o \
4075 @@ -17,6 +18,7 @@
4076     define_tristate CONFIG_ZLIB_INFLATE y
4077  else
4078    if [ "$CONFIG_CRAMFS" = "m" -o \
4079 +       "$CONFIG_SQUASHFS" = "m" -o \
4080         "$CONFIG_PPP_DEFLATE" = "m" -o \
4081         "$CONFIG_CRYPTO_DEFLATE" = "m" -o \
4082         "$CONFIG_JFFS2_FS" = "m" -o \