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

   1 --- a/fs/Config.in
   2 +++ b/fs/Config.in
   3 @@ -51,6 +51,14 @@ if [ "$CONFIG_JFFS2_FS" = "y" -o "$CONFI
   4     int 'JFFS2 debugging verbosity (0 = quiet, 2 = noisy)' CONFIG_JFFS2_FS_DEBUG 0
   5  fi
   6  tristate 'Compressed ROM file system support' CONFIG_CRAMFS
   7 +tristate 'Squashed file system support' CONFIG_SQUASHFS
   8 +if [ "$CONFIG_SQUASHFS" = "y" -o "$CONFIG_SQUASHFS" = "m" ] ; then
   9 +bool 'Additional options for memory constrained systems ' CONFIG_SQUASHFS_EMBEDDED
  10 +fi
  11 +if [ "$CONFIG_SQUASHFS_EMBEDDED" = "y" ] ; then
  12 +int 'Number of fragments cached' CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE 3
  13 +bool 'Use Vmalloc rather than Kmalloc'  CONFIG_SQUASHFS_VMALLOC
  14 +fi
  15  bool 'Virtual memory file system support (former shm fs)' CONFIG_TMPFS
  16  define_bool CONFIG_RAMFS y
  17
  18 --- a/fs/Makefile
  19 +++ b/fs/Makefile
  20 @@ -65,6 +65,7 @@ subdir-$(CONFIG_REISERFS_FS)  += reiserfs
  21  subdir-$(CONFIG_DEVPTS_FS)     += devpts
  22  subdir-$(CONFIG_SUN_OPENPROMFS)        += openpromfs
  23  subdir-$(CONFIG_BEFS_FS)       += befs
  24 +subdir-$(CONFIG_SQUASHFS)      += squashfs
  25  subdir-$(CONFIG_JFS_FS)                += jfs
  26  subdir-$(CONFIG_XFS_FS)                += xfs
  27
  28 --- /dev/null
  29 +++ b/fs/squashfs/inode.c
  30 @@ -0,0 +1,2028 @@
  31 +/*
  32 + * Squashfs - a compressed read only filesystem for Linux
  33 + *
  34 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
  35 + * Phillip Lougher <phillip@lougher.org.uk>
  36 + *
  37 + * This program is free software; you can redistribute it and/or
  38 + * modify it under the terms of the GNU General Public License
  39 + * as published by the Free Software Foundation; either version 2,
  40 + * or (at your option) any later version.
  41 + *
  42 + * This program is distributed in the hope that it will be useful,
  43 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  44 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  45 + * GNU General Public License for more details.
  46 + *
  47 + * You should have received a copy of the GNU General Public License
  48 + * along with this program; if not, write to the Free Software
  49 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  50 + *
  51 + * inode.c
  52 + */
  53 +
  54 +#include <linux/types.h>
  55 +#include <linux/squashfs_fs.h>
  56 +#include <linux/module.h>
  57 +#include <linux/errno.h>
  58 +#include <linux/slab.h>
  59 +#include <linux/fs.h>
  60 +#include <linux/smp_lock.h>
  61 +#include <linux/locks.h>
  62 +#include <linux/init.h>
  63 +#include <linux/dcache.h>
  64 +#include <linux/wait.h>
  65 +#include <linux/zlib.h>
  66 +#include <linux/blkdev.h>
  67 +#include <linux/vmalloc.h>
  68 +#include <asm/uaccess.h>
  69 +#include <asm/semaphore.h>
  70 +
  71 +#include "squashfs.h"
  72 +
  73 +static struct super_block *squashfs_read_super(struct super_block *, void *, int);
  74 +static void squashfs_put_super(struct super_block *);
  75 +static int squashfs_statfs(struct super_block *, struct statfs *);
  76 +static int squashfs_symlink_readpage(struct file *file, struct page *page);
  77 +static int squashfs_readpage(struct file *file, struct page *page);
  78 +static int squashfs_readpage4K(struct file *file, struct page *page);
  79 +static int squashfs_readdir(struct file *, void *, filldir_t);
  80 +static struct dentry *squashfs_lookup(struct inode *, struct dentry *);
  81 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode);
  82 +static long long read_blocklist(struct inode *inode, int index,
  83 +                               int readahead_blks, char *block_list,
  84 +                               unsigned short **block_p, unsigned int *bsize);
  85 +
  86 +static z_stream stream;
  87 +
  88 +static DECLARE_FSTYPE_DEV(squashfs_fs_type, "squashfs", squashfs_read_super);
  89 +
  90 +static unsigned char squashfs_filetype_table[] = {
  91 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
  92 +};
  93 +
  94 +static struct super_operations squashfs_ops = {
  95 +       .statfs = squashfs_statfs,
  96 +       .put_super = squashfs_put_super,
  97 +};
  98 +
  99 +SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = {
 100 +       .readpage = squashfs_symlink_readpage
 101 +};
 102 +
 103 +SQSH_EXTERN struct address_space_operations squashfs_aops = {
 104 +       .readpage = squashfs_readpage
 105 +};
 106 +
 107 +SQSH_EXTERN struct address_space_operations squashfs_aops_4K = {
 108 +       .readpage = squashfs_readpage4K
 109 +};
 110 +
 111 +static struct file_operations squashfs_dir_ops = {
 112 +       .read = generic_read_dir,
 113 +       .readdir = squashfs_readdir
 114 +};
 115 +
 116 +static struct inode_operations squashfs_dir_inode_ops = {
 117 +       .lookup = squashfs_lookup
 118 +};
 119 +
 120 +static struct buffer_head *get_block_length(struct super_block *s,
 121 +                               int *cur_index, int *offset, int *c_byte)
 122 +{
 123 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 124 +       unsigned short temp;
 125 +       struct buffer_head *bh;
 126 +
 127 +       if (!(bh = sb_bread(s, *cur_index)))
 128 +               goto out;
 129 +
 130 +       if (msblk->devblksize - *offset == 1) {
 131 +               if (msblk->swap)
 132 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 133 +                               (bh->b_data + *offset));
 134 +               else
 135 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 136 +                               (bh->b_data + *offset));
 137 +               brelse(bh);
 138 +               if (!(bh = sb_bread(s, ++(*cur_index))))
 139 +                       goto out;
 140 +               if (msblk->swap)
 141 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 142 +                               bh->b_data);
 143 +               else
 144 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 145 +                               bh->b_data);
 146 +               *c_byte = temp;
 147 +               *offset = 1;
 148 +       } else {
 149 +               if (msblk->swap) {
 150 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 151 +                               (bh->b_data + *offset));
 152 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 153 +                               (bh->b_data + *offset + 1));
 154 +               } else {
 155 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 156 +                               (bh->b_data + *offset));
 157 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 158 +                               (bh->b_data + *offset + 1));
 159 +               }
 160 +               *c_byte = temp;
 161 +               *offset += 2;
 162 +       }
 163 +
 164 +       if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) {
 165 +               if (*offset == msblk->devblksize) {
 166 +                       brelse(bh);
 167 +                       if (!(bh = sb_bread(s, ++(*cur_index))))
 168 +                               goto out;
 169 +                       *offset = 0;
 170 +               }
 171 +               if (*((unsigned char *) (bh->b_data + *offset)) !=
 172 +                                               SQUASHFS_MARKER_BYTE) {
 173 +                       ERROR("Metadata block marker corrupt @ %x\n",
 174 +                                               *cur_index);
 175 +                       brelse(bh);
 176 +                       goto out;
 177 +               }
 178 +               (*offset)++;
 179 +       }
 180 +       return bh;
 181 +
 182 +out:
 183 +       return NULL;
 184 +}
 185 +
 186 +
 187 +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer,
 188 +                       long long index, unsigned int length,
 189 +                       long long *next_index)
 190 +{
 191 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 192 +       struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
 193 +                       msblk->devblksize_log2) + 2];
 194 +       unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
 195 +       unsigned int cur_index = index >> msblk->devblksize_log2;
 196 +       int bytes, avail_bytes, b = 0, k;
 197 +       char *c_buffer;
 198 +       unsigned int compressed;
 199 +       unsigned int c_byte = length;
 200 +
 201 +       if (c_byte) {
 202 +               bytes = msblk->devblksize - offset;
 203 +               compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
 204 +               c_buffer = compressed ? msblk->read_data : buffer;
 205 +               c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
 206 +
 207 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 208 +                                       ? "" : "un", (unsigned int) c_byte);
 209 +
 210 +               if (!(bh[0] = sb_getblk(s, cur_index)))
 211 +                       goto block_release;
 212 +
 213 +               for (b = 1; bytes < c_byte; b++) {
 214 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 215 +                               goto block_release;
 216 +                       bytes += msblk->devblksize;
 217 +               }
 218 +               ll_rw_block(READ, b, bh);
 219 +       } else {
 220 +               if (!(bh[0] = get_block_length(s, &cur_index, &offset,
 221 +                                                               &c_byte)))
 222 +                       goto read_failure;
 223 +
 224 +               bytes = msblk->devblksize - offset;
 225 +               compressed = SQUASHFS_COMPRESSED(c_byte);
 226 +               c_buffer = compressed ? msblk->read_data : buffer;
 227 +               c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
 228 +
 229 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 230 +                                       ? "" : "un", (unsigned int) c_byte);
 231 +
 232 +               for (b = 1; bytes < c_byte; b++) {
 233 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 234 +                               goto block_release;
 235 +                       bytes += msblk->devblksize;
 236 +               }
 237 +               ll_rw_block(READ, b - 1, bh + 1);
 238 +       }
 239 +
 240 +       if (compressed)
 241 +               down(&msblk->read_data_mutex);
 242 +
 243 +       for (bytes = 0, k = 0; k < b; k++) {
 244 +               avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
 245 +                                       msblk->devblksize - offset :
 246 +                                       c_byte - bytes;
 247 +               wait_on_buffer(bh[k]);
 248 +               if (!buffer_uptodate(bh[k]))
 249 +                       goto block_release;
 250 +               memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
 251 +               bytes += avail_bytes;
 252 +               offset = 0;
 253 +               brelse(bh[k]);
 254 +       }
 255 +
 256 +       /*
 257 +        * uncompress block
 258 +        */
 259 +       if (compressed) {
 260 +               int zlib_err;
 261 +
 262 +               stream.next_in = c_buffer;
 263 +               stream.avail_in = c_byte;
 264 +               stream.next_out = buffer;
 265 +               stream.avail_out = msblk->read_size;
 266 +
 267 +               if (((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
 268 +                               ((zlib_err = zlib_inflate(&stream, Z_FINISH))
 269 +                                != Z_STREAM_END) || ((zlib_err =
 270 +                               zlib_inflateEnd(&stream)) != Z_OK)) {
 271 +                       ERROR("zlib_fs returned unexpected result 0x%x\n",
 272 +                               zlib_err);
 273 +                       bytes = 0;
 274 +               } else
 275 +                       bytes = stream.total_out;
 276 +
 277 +               up(&msblk->read_data_mutex);
 278 +       }
 279 +
 280 +       if (next_index)
 281 +               *next_index = index + c_byte + (length ? 0 :
 282 +                               (SQUASHFS_CHECK_DATA(msblk->sblk.flags)
 283 +                                ? 3 : 2));
 284 +       return bytes;
 285 +
 286 +block_release:
 287 +       while (--b >= 0)
 288 +               brelse(bh[b]);
 289 +
 290 +read_failure:
 291 +       ERROR("sb_bread failed reading block 0x%x\n", cur_index);
 292 +       return 0;
 293 +}
 294 +
 295 +
 296 +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
 297 +                               long long block, unsigned int offset,
 298 +                               int length, long long *next_block,
 299 +                               unsigned int *next_offset)
 300 +{
 301 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 302 +       int n, i, bytes, return_length = length;
 303 +       long long next_index;
 304 +
 305 +       TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
 306 +
 307 +       while ( 1 ) {
 308 +               for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
 309 +                       if (msblk->block_cache[i].block == block)
 310 +                               break;
 311 +
 312 +               down(&msblk->block_cache_mutex);
 313 +
 314 +               if (i == SQUASHFS_CACHED_BLKS) {
 315 +                       /* read inode header block */
 316 +                       for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS;
 317 +                                       n ; n --, i = (i + 1) %
 318 +                                       SQUASHFS_CACHED_BLKS)
 319 +                               if (msblk->block_cache[i].block !=
 320 +                                                       SQUASHFS_USED_BLK)
 321 +                                       break;
 322 +
 323 +                       if (n == 0) {
 324 +                               wait_queue_t wait;
 325 +
 326 +                               init_waitqueue_entry(&wait, current);
 327 +                               add_wait_queue(&msblk->waitq, &wait);
 328 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 329 +                               up(&msblk->block_cache_mutex);
 330 +                               schedule();
 331 +                               set_current_state(TASK_RUNNING);
 332 +                               remove_wait_queue(&msblk->waitq, &wait);
 333 +                               continue;
 334 +                       }
 335 +                       msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
 336 +
 337 +                       if (msblk->block_cache[i].block ==
 338 +                                                       SQUASHFS_INVALID_BLK) {
 339 +                               if (!(msblk->block_cache[i].data =
 340 +                                               kmalloc(SQUASHFS_METADATA_SIZE,
 341 +                                               GFP_KERNEL))) {
 342 +                                       ERROR("Failed to allocate cache"
 343 +                                                       "block\n");
 344 +                                       up(&msblk->block_cache_mutex);
 345 +                                       goto out;
 346 +                               }
 347 +                       }
 348 +
 349 +                       msblk->block_cache[i].block = SQUASHFS_USED_BLK;
 350 +                       up(&msblk->block_cache_mutex);
 351 +
 352 +                       if (!(msblk->block_cache[i].length =
 353 +                                               squashfs_read_data(s,
 354 +                                               msblk->block_cache[i].data,
 355 +                                               block, 0, &next_index))) {
 356 +                               ERROR("Unable to read cache block [%llx:%x]\n",
 357 +                                               block, offset);
 358 +                               goto out;
 359 +                       }
 360 +
 361 +                       down(&msblk->block_cache_mutex);
 362 +                       wake_up(&msblk->waitq);
 363 +                       msblk->block_cache[i].block = block;
 364 +                       msblk->block_cache[i].next_index = next_index;
 365 +                       TRACE("Read cache block [%llx:%x]\n", block, offset);
 366 +               }
 367 +
 368 +               if (msblk->block_cache[i].block != block) {
 369 +                       up(&msblk->block_cache_mutex);
 370 +                       continue;
 371 +               }
 372 +
 373 +               if ((bytes = msblk->block_cache[i].length - offset) >= length) {
 374 +                       if (buffer)
 375 +                               memcpy(buffer, msblk->block_cache[i].data +
 376 +                                               offset, length);
 377 +                       if (msblk->block_cache[i].length - offset == length) {
 378 +                               *next_block = msblk->block_cache[i].next_index;
 379 +                               *next_offset = 0;
 380 +                       } else {
 381 +                               *next_block = block;
 382 +                               *next_offset = offset + length;
 383 +                       }
 384 +                       up(&msblk->block_cache_mutex);
 385 +                       goto finish;
 386 +               } else {
 387 +                       if (buffer) {
 388 +                               memcpy(buffer, msblk->block_cache[i].data +
 389 +                                               offset, bytes);
 390 +                               buffer += bytes;
 391 +                       }
 392 +                       block = msblk->block_cache[i].next_index;
 393 +                       up(&msblk->block_cache_mutex);
 394 +                       length -= bytes;
 395 +                       offset = 0;
 396 +               }
 397 +       }
 398 +
 399 +finish:
 400 +       return return_length;
 401 +out:
 402 +       return 0;
 403 +}
 404 +
 405 +
 406 +static int get_fragment_location(struct super_block *s, unsigned int fragment,
 407 +                               long long *fragment_start_block,
 408 +                               unsigned int *fragment_size)
 409 +{
 410 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 411 +       long long start_block =
 412 +               msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
 413 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
 414 +       struct squashfs_fragment_entry fragment_entry;
 415 +
 416 +       if (msblk->swap) {
 417 +               struct squashfs_fragment_entry sfragment_entry;
 418 +
 419 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
 420 +                                       start_block, offset,
 421 +                                       sizeof(sfragment_entry), &start_block,
 422 +                                       &offset))
 423 +                       goto out;
 424 +               SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
 425 +       } else
 426 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
 427 +                                       start_block, offset,
 428 +                                       sizeof(fragment_entry), &start_block,
 429 +                                       &offset))
 430 +                       goto out;
 431 +
 432 +       *fragment_start_block = fragment_entry.start_block;
 433 +       *fragment_size = fragment_entry.size;
 434 +
 435 +       return 1;
 436 +
 437 +out:
 438 +       return 0;
 439 +}
 440 +
 441 +
 442 +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
 443 +                                       squashfs_fragment_cache *fragment)
 444 +{
 445 +       down(&msblk->fragment_mutex);
 446 +       fragment->locked --;
 447 +       wake_up(&msblk->fragment_wait_queue);
 448 +       up(&msblk->fragment_mutex);
 449 +}
 450 +
 451 +
 452 +SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
 453 +                                       *s, long long start_block,
 454 +                                       int length)
 455 +{
 456 +       int i, n;
 457 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 458 +
 459 +       while ( 1 ) {
 460 +               down(&msblk->fragment_mutex);
 461 +
 462 +               for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
 463 +                               msblk->fragment[i].block != start_block; i++);
 464 +
 465 +               if (i == SQUASHFS_CACHED_FRAGMENTS) {
 466 +                       for (i = msblk->next_fragment, n =
 467 +                               SQUASHFS_CACHED_FRAGMENTS; n &&
 468 +                               msblk->fragment[i].locked; n--, i = (i + 1) %
 469 +                               SQUASHFS_CACHED_FRAGMENTS);
 470 +
 471 +                       if (n == 0) {
 472 +                               wait_queue_t wait;
 473 +
 474 +                               init_waitqueue_entry(&wait, current);
 475 +                               add_wait_queue(&msblk->fragment_wait_queue,
 476 +                                                                       &wait);
 477 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 478 +                               up(&msblk->fragment_mutex);
 479 +                               schedule();
 480 +                               set_current_state(TASK_RUNNING);
 481 +                               remove_wait_queue(&msblk->fragment_wait_queue,
 482 +                                                                       &wait);
 483 +                               continue;
 484 +                       }
 485 +                       msblk->next_fragment = (msblk->next_fragment + 1) %
 486 +                               SQUASHFS_CACHED_FRAGMENTS;
 487 +
 488 +                       if (msblk->fragment[i].data == NULL)
 489 +                               if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
 490 +                                               (SQUASHFS_FILE_MAX_SIZE))) {
 491 +                                       ERROR("Failed to allocate fragment "
 492 +                                                       "cache block\n");
 493 +                                       up(&msblk->fragment_mutex);
 494 +                                       goto out;
 495 +                               }
 496 +
 497 +                       msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
 498 +                       msblk->fragment[i].locked = 1;
 499 +                       up(&msblk->fragment_mutex);
 500 +
 501 +                       if (!(msblk->fragment[i].length = squashfs_read_data(s,
 502 +                                               msblk->fragment[i].data,
 503 +                                               start_block, length, NULL))) {
 504 +                               ERROR("Unable to read fragment cache block "
 505 +                                                       "[%llx]\n", start_block);
 506 +                               msblk->fragment[i].locked = 0;
 507 +                               goto out;
 508 +                       }
 509 +
 510 +                       msblk->fragment[i].block = start_block;
 511 +                       TRACE("New fragment %d, start block %lld, locked %d\n",
 512 +                                               i, msblk->fragment[i].block,
 513 +                                               msblk->fragment[i].locked);
 514 +                       break;
 515 +               }
 516 +
 517 +               msblk->fragment[i].locked++;
 518 +               up(&msblk->fragment_mutex);
 519 +               TRACE("Got fragment %d, start block %lld, locked %d\n", i,
 520 +                                               msblk->fragment[i].block,
 521 +                                               msblk->fragment[i].locked);
 522 +               break;
 523 +       }
 524 +
 525 +       return &msblk->fragment[i];
 526 +
 527 +out:
 528 +       return NULL;
 529 +}
 530 +
 531 +
 532 +static struct inode *squashfs_new_inode(struct super_block *s,
 533 +               struct squashfs_base_inode_header *inodeb)
 534 +{
 535 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 536 +       struct inode *i = new_inode(s);
 537 +
 538 +       if (i) {
 539 +               i->i_ino = inodeb->inode_number;
 540 +               i->i_mtime = inodeb->mtime;
 541 +               i->i_atime = inodeb->mtime;
 542 +               i->i_ctime = inodeb->mtime;
 543 +               i->i_uid = msblk->uid[inodeb->uid];
 544 +               i->i_mode = inodeb->mode;
 545 +               i->i_size = 0;
 546 +               if (inodeb->guid == SQUASHFS_GUIDS)
 547 +                       i->i_gid = i->i_uid;
 548 +               else
 549 +                       i->i_gid = msblk->guid[inodeb->guid];
 550 +       }
 551 +
 552 +       return i;
 553 +}
 554 +
 555 +
 556 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode)
 557 +{
 558 +       struct inode *i;
 559 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 560 +       struct squashfs_super_block *sblk = &msblk->sblk;
 561 +       long long block = SQUASHFS_INODE_BLK(inode) +
 562 +               sblk->inode_table_start;
 563 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
 564 +       long long next_block;
 565 +       unsigned int next_offset;
 566 +       union squashfs_inode_header id, sid;
 567 +       struct squashfs_base_inode_header *inodeb = &id.base,
 568 +                                         *sinodeb = &sid.base;
 569 +
 570 +       TRACE("Entered squashfs_iget\n");
 571 +
 572 +       if (msblk->swap) {
 573 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
 574 +                                       offset, sizeof(*sinodeb), &next_block,
 575 +                                       &next_offset))
 576 +                       goto failed_read;
 577 +               SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb,
 578 +                                       sizeof(*sinodeb));
 579 +       } else
 580 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
 581 +                                       offset, sizeof(*inodeb), &next_block,
 582 +                                       &next_offset))
 583 +                       goto failed_read;
 584 +
 585 +       switch(inodeb->inode_type) {
 586 +               case SQUASHFS_FILE_TYPE: {
 587 +                       unsigned int frag_size;
 588 +                       long long frag_blk;
 589 +                       struct squashfs_reg_inode_header *inodep = &id.reg;
 590 +                       struct squashfs_reg_inode_header *sinodep = &sid.reg;
 591 +
 592 +                       if (msblk->swap) {
 593 +                               if (!squashfs_get_cached_block(s, (char *)
 594 +                                               sinodep, block, offset,
 595 +                                               sizeof(*sinodep), &next_block,
 596 +                                               &next_offset))
 597 +                                       goto failed_read;
 598 +                               SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep);
 599 +                       } else
 600 +                               if (!squashfs_get_cached_block(s, (char *)
 601 +                                               inodep, block, offset,
 602 +                                               sizeof(*inodep), &next_block,
 603 +                                               &next_offset))
 604 +                                       goto failed_read;
 605 +
 606 +                       frag_blk = SQUASHFS_INVALID_BLK;
 607 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 608 +                                       !get_fragment_location(s,
 609 +                                       inodep->fragment, &frag_blk, &frag_size))
 610 +                               goto failed_read;
 611 +
 612 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 613 +                               goto failed_read1;
 614 +
 615 +                       i->i_nlink = 1;
 616 +                       i->i_size = inodep->file_size;
 617 +                       i->i_fop = &generic_ro_fops;
 618 +                       i->i_mode |= S_IFREG;
 619 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 620 +                       i->i_blksize = PAGE_CACHE_SIZE;
 621 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 622 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 623 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 624 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 625 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 626 +                       SQUASHFS_I(i)->offset = next_offset;
 627 +                       if (sblk->block_size > 4096)
 628 +                               i->i_data.a_ops = &squashfs_aops;
 629 +                       else
 630 +                               i->i_data.a_ops = &squashfs_aops_4K;
 631 +
 632 +                       TRACE("File inode %x:%x, start_block %llx, "
 633 +                                       "block_list_start %llx, offset %x\n",
 634 +                                       SQUASHFS_INODE_BLK(inode), offset,
 635 +                                       inodep->start_block, next_block,
 636 +                                       next_offset);
 637 +                       break;
 638 +               }
 639 +               case SQUASHFS_LREG_TYPE: {
 640 +                       unsigned int frag_size;
 641 +                       long long frag_blk;
 642 +                       struct squashfs_lreg_inode_header *inodep = &id.lreg;
 643 +                       struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
 644 +
 645 +                       if (msblk->swap) {
 646 +                               if (!squashfs_get_cached_block(s, (char *)
 647 +                                               sinodep, block, offset,
 648 +                                               sizeof(*sinodep), &next_block,
 649 +                                               &next_offset))
 650 +                                       goto failed_read;
 651 +                               SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
 652 +                       } else
 653 +                               if (!squashfs_get_cached_block(s, (char *)
 654 +                                               inodep, block, offset,
 655 +                                               sizeof(*inodep), &next_block,
 656 +                                               &next_offset))
 657 +                                       goto failed_read;
 658 +
 659 +                       frag_blk = SQUASHFS_INVALID_BLK;
 660 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 661 +                                       !get_fragment_location(s,
 662 +                                       inodep->fragment, &frag_blk, &frag_size))
 663 +                               goto failed_read;
 664 +
 665 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 666 +                               goto failed_read1;
 667 +
 668 +                       i->i_nlink = inodep->nlink;
 669 +                       i->i_size = inodep->file_size;
 670 +                       i->i_fop = &generic_ro_fops;
 671 +                       i->i_mode |= S_IFREG;
 672 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 673 +                       i->i_blksize = PAGE_CACHE_SIZE;
 674 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 675 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 676 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 677 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 678 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 679 +                       SQUASHFS_I(i)->offset = next_offset;
 680 +                       if (sblk->block_size > 4096)
 681 +                               i->i_data.a_ops = &squashfs_aops;
 682 +                       else
 683 +                               i->i_data.a_ops = &squashfs_aops_4K;
 684 +
 685 +                       TRACE("File inode %x:%x, start_block %llx, "
 686 +                                       "block_list_start %llx, offset %x\n",
 687 +                                       SQUASHFS_INODE_BLK(inode), offset,
 688 +                                       inodep->start_block, next_block,
 689 +                                       next_offset);
 690 +                       break;
 691 +               }
 692 +               case SQUASHFS_DIR_TYPE: {
 693 +                       struct squashfs_dir_inode_header *inodep = &id.dir;
 694 +                       struct squashfs_dir_inode_header *sinodep = &sid.dir;
 695 +
 696 +                       if (msblk->swap) {
 697 +                               if (!squashfs_get_cached_block(s, (char *)
 698 +                                               sinodep, block, offset,
 699 +                                               sizeof(*sinodep), &next_block,
 700 +                                               &next_offset))
 701 +                                       goto failed_read;
 702 +                               SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep);
 703 +                       } else
 704 +                               if (!squashfs_get_cached_block(s, (char *)
 705 +                                               inodep, block, offset,
 706 +                                               sizeof(*inodep), &next_block,
 707 +                                               &next_offset))
 708 +                                       goto failed_read;
 709 +
 710 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 711 +                               goto failed_read1;
 712 +
 713 +                       i->i_nlink = inodep->nlink;
 714 +                       i->i_size = inodep->file_size;
 715 +                       i->i_op = &squashfs_dir_inode_ops;
 716 +                       i->i_fop = &squashfs_dir_ops;
 717 +                       i->i_mode |= S_IFDIR;
 718 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 719 +                       SQUASHFS_I(i)->offset = inodep->offset;
 720 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
 721 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 722 +
 723 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
 724 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
 725 +                                       offset, inodep->start_block,
 726 +                                       inodep->offset);
 727 +                       break;
 728 +               }
 729 +               case SQUASHFS_LDIR_TYPE: {
 730 +                       struct squashfs_ldir_inode_header *inodep = &id.ldir;
 731 +                       struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
 732 +
 733 +                       if (msblk->swap) {
 734 +                               if (!squashfs_get_cached_block(s, (char *)
 735 +                                               sinodep, block, offset,
 736 +                                               sizeof(*sinodep), &next_block,
 737 +                                               &next_offset))
 738 +                                       goto failed_read;
 739 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep,
 740 +                                               sinodep);
 741 +                       } else
 742 +                               if (!squashfs_get_cached_block(s, (char *)
 743 +                                               inodep, block, offset,
 744 +                                               sizeof(*inodep), &next_block,
 745 +                                               &next_offset))
 746 +                                       goto failed_read;
 747 +
 748 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 749 +                               goto failed_read1;
 750 +
 751 +                       i->i_nlink = inodep->nlink;
 752 +                       i->i_size = inodep->file_size;
 753 +                       i->i_op = &squashfs_dir_inode_ops;
 754 +                       i->i_fop = &squashfs_dir_ops;
 755 +                       i->i_mode |= S_IFDIR;
 756 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 757 +                       SQUASHFS_I(i)->offset = inodep->offset;
 758 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
 759 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
 760 +                                                               next_offset;
 761 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
 762 +                                                               inodep->i_count;
 763 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 764 +
 765 +                       TRACE("Long directory inode %x:%x, start_block %x, "
 766 +                                       "offset %x\n",
 767 +                                       SQUASHFS_INODE_BLK(inode), offset,
 768 +                                       inodep->start_block, inodep->offset);
 769 +                       break;
 770 +               }
 771 +               case SQUASHFS_SYMLINK_TYPE: {
 772 +                       struct squashfs_symlink_inode_header *inodep =
 773 +                                                               &id.symlink;
 774 +                       struct squashfs_symlink_inode_header *sinodep =
 775 +                                                               &sid.symlink;
 776 +
 777 +                       if (msblk->swap) {
 778 +                               if (!squashfs_get_cached_block(s, (char *)
 779 +                                               sinodep, block, offset,
 780 +                                               sizeof(*sinodep), &next_block,
 781 +                                               &next_offset))
 782 +                                       goto failed_read;
 783 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep,
 784 +                                                               sinodep);
 785 +                       } else
 786 +                               if (!squashfs_get_cached_block(s, (char *)
 787 +                                               inodep, block, offset,
 788 +                                               sizeof(*inodep), &next_block,
 789 +                                               &next_offset))
 790 +                                       goto failed_read;
 791 +
 792 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 793 +                               goto failed_read1;
 794 +
 795 +                       i->i_nlink = inodep->nlink;
 796 +                       i->i_size = inodep->symlink_size;
 797 +                       i->i_op = &page_symlink_inode_operations;
 798 +                       i->i_data.a_ops = &squashfs_symlink_aops;
 799 +                       i->i_mode |= S_IFLNK;
 800 +                       SQUASHFS_I(i)->start_block = next_block;
 801 +                       SQUASHFS_I(i)->offset = next_offset;
 802 +
 803 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
 804 +                                       "offset %x\n",
 805 +                                       SQUASHFS_INODE_BLK(inode), offset,
 806 +                                       next_block, next_offset);
 807 +                       break;
 808 +                }
 809 +                case SQUASHFS_BLKDEV_TYPE:
 810 +                case SQUASHFS_CHRDEV_TYPE: {
 811 +                       struct squashfs_dev_inode_header *inodep = &id.dev;
 812 +                       struct squashfs_dev_inode_header *sinodep = &sid.dev;
 813 +
 814 +                       if (msblk->swap) {
 815 +                               if (!squashfs_get_cached_block(s, (char *)
 816 +                                               sinodep, block, offset,
 817 +                                               sizeof(*sinodep), &next_block,
 818 +                                               &next_offset))
 819 +                                       goto failed_read;
 820 +                               SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep);
 821 +                       } else
 822 +                               if (!squashfs_get_cached_block(s, (char *)
 823 +                                               inodep, block, offset,
 824 +                                               sizeof(*inodep), &next_block,
 825 +                                               &next_offset))
 826 +                                       goto failed_read;
 827 +
 828 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 829 +                               goto failed_read1;
 830 +
 831 +                       i->i_nlink = inodep->nlink;
 832 +                       i->i_mode |= (inodeb->inode_type ==
 833 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
 834 +                                       S_IFBLK;
 835 +                       init_special_inode(i, i->i_mode, inodep->rdev);
 836 +
 837 +                       TRACE("Device inode %x:%x, rdev %x\n",
 838 +                                       SQUASHFS_INODE_BLK(inode), offset,
 839 +                                       inodep->rdev);
 840 +                       break;
 841 +                }
 842 +                case SQUASHFS_FIFO_TYPE:
 843 +                case SQUASHFS_SOCKET_TYPE: {
 844 +                       struct squashfs_ipc_inode_header *inodep = &id.ipc;
 845 +                       struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
 846 +
 847 +                       if (msblk->swap) {
 848 +                               if (!squashfs_get_cached_block(s, (char *)
 849 +                                               sinodep, block, offset,
 850 +                                               sizeof(*sinodep), &next_block,
 851 +                                               &next_offset))
 852 +                                       goto failed_read;
 853 +                               SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
 854 +                       } else
 855 +                               if (!squashfs_get_cached_block(s, (char *)
 856 +                                               inodep, block, offset,
 857 +                                               sizeof(*inodep), &next_block,
 858 +                                               &next_offset))
 859 +                                       goto failed_read;
 860 +
 861 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 862 +                               goto failed_read1;
 863 +
 864 +                       i->i_nlink = inodep->nlink;
 865 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
 866 +                                                       ? S_IFIFO : S_IFSOCK;
 867 +                       init_special_inode(i, i->i_mode, 0);
 868 +                       break;
 869 +                }
 870 +                default:
 871 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
 872 +                                       inodeb->inode_type);
 873 +                       goto failed_read1;
 874 +       }
 875 +
 876 +       insert_inode_hash(i);
 877 +       return i;
 878 +
 879 +failed_read:
 880 +       ERROR("Unable to read inode [%llx:%x]\n", block, offset);
 881 +
 882 +failed_read1:
 883 +       return NULL;
 884 +}
 885 +
 886 +
 887 +int read_fragment_index_table(struct super_block *s)
 888 +{
 889 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 890 +       struct squashfs_super_block *sblk = &msblk->sblk;
 891 +
 892 +       if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES
 893 +                                       (sblk->fragments), GFP_KERNEL))) {
 894 +               ERROR("Failed to allocate uid/gid table\n");
 895 +               return 0;
 896 +       }
 897 +
 898 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) &&
 899 +                                       !squashfs_read_data(s, (char *)
 900 +                                       msblk->fragment_index,
 901 +                                       sblk->fragment_table_start,
 902 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES
 903 +                                       (sblk->fragments) |
 904 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
 905 +               ERROR("unable to read fragment index table\n");
 906 +               return 0;
 907 +       }
 908 +
 909 +       if (msblk->swap) {
 910 +               int i;
 911 +               long long fragment;
 912 +
 913 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments);
 914 +                                                                       i++) {
 915 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
 916 +                                               &msblk->fragment_index[i], 1);
 917 +                       msblk->fragment_index[i] = fragment;
 918 +               }
 919 +       }
 920 +
 921 +       return 1;
 922 +}
 923 +
 924 +
 925 +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
 926 +{
 927 +       struct squashfs_super_block *sblk = &msblk->sblk;
 928 +
 929 +       msblk->iget = squashfs_iget;
 930 +       msblk->read_blocklist = read_blocklist;
 931 +       msblk->read_fragment_index_table = read_fragment_index_table;
 932 +
 933 +       if (sblk->s_major == 1) {
 934 +               if (!squashfs_1_0_supported(msblk)) {
 935 +                       SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
 936 +                               "are unsupported\n");
 937 +                       SERROR("Please recompile with "
 938 +                               "Squashfs 1.0 support enabled\n");
 939 +                       return 0;
 940 +               }
 941 +       } else if (sblk->s_major == 2) {
 942 +               if (!squashfs_2_0_supported(msblk)) {
 943 +                       SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
 944 +                               "are unsupported\n");
 945 +                       SERROR("Please recompile with "
 946 +                               "Squashfs 2.0 support enabled\n");
 947 +                       return 0;
 948 +               }
 949 +       } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor >
 950 +                       SQUASHFS_MINOR) {
 951 +               SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
 952 +                               "filesystem\n", sblk->s_major, sblk->s_minor);
 953 +               SERROR("Please update your kernel\n");
 954 +               return 0;
 955 +       }
 956 +
 957 +       return 1;
 958 +}
 959 +
 960 +
 961 +static struct super_block *squashfs_read_super(struct super_block *s,
 962 +               void *data, int silent)
 963 +{
 964 +       kdev_t dev = s->s_dev;
 965 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
 966 +       struct squashfs_super_block *sblk = &msblk->sblk;
 967 +       int i;
 968 +       struct inode *root;
 969 +
 970 +       msblk->devblksize = get_hardsect_size(dev);
 971 +       if(msblk->devblksize < BLOCK_SIZE)
 972 +               msblk->devblksize = BLOCK_SIZE;
 973 +       msblk->devblksize_log2 = ffz(~msblk->devblksize);
 974 +        set_blocksize(dev, msblk->devblksize);
 975 +       s->s_blocksize = msblk->devblksize;
 976 +       s->s_blocksize_bits = msblk->devblksize_log2;
 977 +
 978 +       init_MUTEX(&msblk->read_data_mutex);
 979 +       init_MUTEX(&msblk->read_page_mutex);
 980 +       init_MUTEX(&msblk->block_cache_mutex);
 981 +       init_MUTEX(&msblk->fragment_mutex);
 982 +
 983 +       init_waitqueue_head(&msblk->waitq);
 984 +       init_waitqueue_head(&msblk->fragment_wait_queue);
 985 +
 986 +       if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
 987 +                                       sizeof(struct squashfs_super_block) |
 988 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
 989 +               SERROR("unable to read superblock\n");
 990 +               goto failed_mount;
 991 +       }
 992 +
 993 +       /* Check it is a SQUASHFS superblock */
 994 +       msblk->swap = 0;
 995 +       if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
 996 +               if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) {
 997 +                       struct squashfs_super_block ssblk;
 998 +
 999 +                       WARNING("Mounting a different endian SQUASHFS "
1000 +                               "filesystem on %s\n", bdevname(dev));
1001 +
1002 +                       SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
1003 +                       memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
1004 +                       msblk->swap = 1;
1005 +               } else  {
1006 +                       SERROR("Can't find a SQUASHFS superblock on %s\n",
1007 +                                                       bdevname(dev));
1008 +                       goto failed_mount;
1009 +               }
1010 +       }
1011 +
1012 +       /* Check the MAJOR & MINOR versions */
1013 +       if(!supported_squashfs_filesystem(msblk, silent))
1014 +               goto failed_mount;
1015 +
1016 +       TRACE("Found valid superblock on %s\n", bdevname(dev));
1017 +       TRACE("Inodes are %scompressed\n",
1018 +                                       SQUASHFS_UNCOMPRESSED_INODES
1019 +                                       (sblk->flags) ? "un" : "");
1020 +       TRACE("Data is %scompressed\n",
1021 +                                       SQUASHFS_UNCOMPRESSED_DATA(sblk->flags)
1022 +                                       ? "un" : "");
1023 +       TRACE("Check data is %s present in the filesystem\n",
1024 +                                       SQUASHFS_CHECK_DATA(sblk->flags) ?
1025 +                                       "" : "not");
1026 +       TRACE("Filesystem size %lld bytes\n", sblk->bytes_used);
1027 +       TRACE("Block size %d\n", sblk->block_size);
1028 +       TRACE("Number of inodes %d\n", sblk->inodes);
1029 +       if (sblk->s_major > 1)
1030 +               TRACE("Number of fragments %d\n", sblk->fragments);
1031 +       TRACE("Number of uids %d\n", sblk->no_uids);
1032 +       TRACE("Number of gids %d\n", sblk->no_guids);
1033 +       TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
1034 +       TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
1035 +       if (sblk->s_major > 1)
1036 +               TRACE("sblk->fragment_table_start %llx\n",
1037 +                                       sblk->fragment_table_start);
1038 +       TRACE("sblk->uid_start %llx\n", sblk->uid_start);
1039 +
1040 +       s->s_flags |= MS_RDONLY;
1041 +       s->s_op = &squashfs_ops;
1042 +
1043 +       /* Init inode_table block pointer array */
1044 +       if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) *
1045 +                                       SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
1046 +               ERROR("Failed to allocate block cache\n");
1047 +               goto failed_mount;
1048 +       }
1049 +
1050 +       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
1051 +               msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
1052 +
1053 +       msblk->next_cache = 0;
1054 +
1055 +       /* Allocate read_data block */
1056 +       msblk->read_size = (sblk->block_size < SQUASHFS_METADATA_SIZE) ?
1057 +                                       SQUASHFS_METADATA_SIZE :
1058 +                                       sblk->block_size;
1059 +
1060 +       if (!(msblk->read_data = kmalloc(msblk->read_size, GFP_KERNEL))) {
1061 +               ERROR("Failed to allocate read_data block\n");
1062 +               goto failed_mount;
1063 +       }
1064 +
1065 +       /* Allocate read_page block */
1066 +       if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
1067 +               ERROR("Failed to allocate read_page block\n");
1068 +               goto failed_mount;
1069 +       }
1070 +
1071 +       /* Allocate uid and gid tables */
1072 +       if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
1073 +                                       sizeof(unsigned int), GFP_KERNEL))) {
1074 +               ERROR("Failed to allocate uid/gid table\n");
1075 +               goto failed_mount;
1076 +       }
1077 +       msblk->guid = msblk->uid + sblk->no_uids;
1078 +
1079 +       if (msblk->swap) {
1080 +               unsigned int suid[sblk->no_uids + sblk->no_guids];
1081 +
1082 +               if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
1083 +                                       ((sblk->no_uids + sblk->no_guids) *
1084 +                                        sizeof(unsigned int)) |
1085 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1086 +                       ERROR("unable to read uid/gid table\n");
1087 +                       goto failed_mount;
1088 +               }
1089 +
1090 +               SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
1091 +                       sblk->no_guids), (sizeof(unsigned int) * 8));
1092 +       } else
1093 +               if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
1094 +                                       ((sblk->no_uids + sblk->no_guids) *
1095 +                                        sizeof(unsigned int)) |
1096 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1097 +                       ERROR("unable to read uid/gid table\n");
1098 +                       goto failed_mount;
1099 +               }
1100 +
1101 +
1102 +       if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
1103 +               goto allocate_root;
1104 +
1105 +       if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
1106 +                               SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
1107 +               ERROR("Failed to allocate fragment block cache\n");
1108 +               goto failed_mount;
1109 +       }
1110 +
1111 +       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
1112 +               msblk->fragment[i].locked = 0;
1113 +               msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
1114 +               msblk->fragment[i].data = NULL;
1115 +       }
1116 +
1117 +       msblk->next_fragment = 0;
1118 +
1119 +       /* Allocate fragment index table */
1120 +       if(msblk->read_fragment_index_table(s) == 0)
1121 +               goto failed_mount;
1122 +
1123 +allocate_root:
1124 +       if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL)
1125 +               goto failed_mount;
1126 +
1127 +       if ((s->s_root = d_alloc_root(root)) == NULL) {
1128 +               ERROR("Root inode create failed\n");
1129 +               iput(root);
1130 +               goto failed_mount;
1131 +       }
1132 +
1133 +       TRACE("Leaving squashfs_read_super\n");
1134 +       return s;
1135 +
1136 +failed_mount:
1137 +       kfree(msblk->fragment_index);
1138 +       kfree(msblk->fragment);
1139 +       kfree(msblk->uid);
1140 +       kfree(msblk->read_page);
1141 +       kfree(msblk->read_data);
1142 +       kfree(msblk->block_cache);
1143 +       kfree(msblk->fragment_index_2);
1144 +       return NULL;
1145 +}
1146 +
1147 +
1148 +static int squashfs_statfs(struct super_block *s, struct statfs *buf)
1149 +{
1150 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1151 +       struct squashfs_super_block *sblk = &msblk->sblk;
1152 +
1153 +       TRACE("Entered squashfs_statfs\n");
1154 +
1155 +       buf->f_type = SQUASHFS_MAGIC;
1156 +       buf->f_bsize = sblk->block_size;
1157 +       buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1;
1158 +       buf->f_bfree = buf->f_bavail = 0;
1159 +       buf->f_files = sblk->inodes;
1160 +       buf->f_ffree = 0;
1161 +       buf->f_namelen = SQUASHFS_NAME_LEN;
1162 +
1163 +       return 0;
1164 +}
1165 +
1166 +
1167 +static int squashfs_symlink_readpage(struct file *file, struct page *page)
1168 +{
1169 +       struct inode *inode = page->mapping->host;
1170 +       int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
1171 +       long long block = SQUASHFS_I(inode)->start_block;
1172 +       int offset = SQUASHFS_I(inode)->offset;
1173 +       void *pageaddr = kmap(page);
1174 +
1175 +       TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
1176 +                               "%llx, offset %x\n", page->index,
1177 +                               SQUASHFS_I(inode)->start_block,
1178 +                               SQUASHFS_I(inode)->offset);
1179 +
1180 +       for (length = 0; length < index; length += bytes) {
1181 +               if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
1182 +                               block, offset, PAGE_CACHE_SIZE, &block,
1183 +                               &offset))) {
1184 +                       ERROR("Unable to read symbolic link [%llx:%x]\n", block,
1185 +                                       offset);
1186 +                       goto skip_read;
1187 +               }
1188 +       }
1189 +
1190 +       if (length != index) {
1191 +               ERROR("(squashfs_symlink_readpage) length != index\n");
1192 +               bytes = 0;
1193 +               goto skip_read;
1194 +       }
1195 +
1196 +       bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
1197 +                                       i_size_read(inode) - length;
1198 +
1199 +       if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
1200 +                                       offset, bytes, &block, &offset)))
1201 +               ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
1202 +
1203 +skip_read:
1204 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1205 +       kunmap(page);
1206 +       SetPageUptodate(page);
1207 +       UnlockPage(page);
1208 +
1209 +       return 0;
1210 +}
1211 +
1212 +
1213 +struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
1214 +{
1215 +       struct meta_index *meta = NULL;
1216 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1217 +       int i;
1218 +
1219 +       down(&msblk->meta_index_mutex);
1220 +
1221 +       TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
1222 +
1223 +       if(msblk->meta_index == NULL)
1224 +               goto not_allocated;
1225 +
1226 +       for (i = 0; i < SQUASHFS_META_NUMBER; i ++)
1227 +               if (msblk->meta_index[i].inode_number == inode->i_ino &&
1228 +                               msblk->meta_index[i].offset >= offset &&
1229 +                               msblk->meta_index[i].offset <= index &&
1230 +                               msblk->meta_index[i].locked == 0) {
1231 +                       TRACE("locate_meta_index: entry %d, offset %d\n", i,
1232 +                                       msblk->meta_index[i].offset);
1233 +                       meta = &msblk->meta_index[i];
1234 +                       offset = meta->offset;
1235 +               }
1236 +
1237 +       if (meta)
1238 +               meta->locked = 1;
1239 +
1240 +not_allocated:
1241 +       up(&msblk->meta_index_mutex);
1242 +
1243 +       return meta;
1244 +}
1245 +
1246 +
1247 +struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
1248 +{
1249 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1250 +       struct meta_index *meta = NULL;
1251 +       int i;
1252 +
1253 +       down(&msblk->meta_index_mutex);
1254 +
1255 +       TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
1256 +
1257 +       if(msblk->meta_index == NULL) {
1258 +               if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
1259 +                                       SQUASHFS_META_NUMBER, GFP_KERNEL))) {
1260 +                       ERROR("Failed to allocate meta_index\n");
1261 +                       goto failed;
1262 +               }
1263 +               for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
1264 +                       msblk->meta_index[i].inode_number = 0;
1265 +                       msblk->meta_index[i].locked = 0;
1266 +               }
1267 +               msblk->next_meta_index = 0;
1268 +       }
1269 +
1270 +       for(i = SQUASHFS_META_NUMBER; i &&
1271 +                       msblk->meta_index[msblk->next_meta_index].locked; i --)
1272 +               msblk->next_meta_index = (msblk->next_meta_index + 1) %
1273 +                       SQUASHFS_META_NUMBER;
1274 +
1275 +       if(i == 0) {
1276 +               TRACE("empty_meta_index: failed!\n");
1277 +               goto failed;
1278 +       }
1279 +
1280 +       TRACE("empty_meta_index: returned meta entry %d, %p\n",
1281 +                       msblk->next_meta_index,
1282 +                       &msblk->meta_index[msblk->next_meta_index]);
1283 +
1284 +       meta = &msblk->meta_index[msblk->next_meta_index];
1285 +       msblk->next_meta_index = (msblk->next_meta_index + 1) %
1286 +                       SQUASHFS_META_NUMBER;
1287 +
1288 +       meta->inode_number = inode->i_ino;
1289 +       meta->offset = offset;
1290 +       meta->skip = skip;
1291 +       meta->entries = 0;
1292 +       meta->locked = 1;
1293 +
1294 +failed:
1295 +       up(&msblk->meta_index_mutex);
1296 +       return meta;
1297 +}
1298 +
1299 +
1300 +void release_meta_index(struct inode *inode, struct meta_index *meta)
1301 +{
1302 +       meta->locked = 0;
1303 +}
1304 +
1305 +
1306 +static int read_block_index(struct super_block *s, int blocks, char *block_list,
1307 +               long long *start_block, int *offset)
1308 +{
1309 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1310 +       unsigned int *block_listp;
1311 +       int block = 0;
1312 +
1313 +       if (msblk->swap) {
1314 +               char sblock_list[blocks << 2];
1315 +
1316 +               if (!squashfs_get_cached_block(s, sblock_list, *start_block,
1317 +                               *offset, blocks << 2, start_block, offset)) {
1318 +                       ERROR("Unable to read block list [%llx:%x]\n",
1319 +                               *start_block, *offset);
1320 +                       goto failure;
1321 +               }
1322 +               SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
1323 +                               ((unsigned int *)sblock_list), blocks);
1324 +       } else
1325 +               if (!squashfs_get_cached_block(s, block_list, *start_block,
1326 +                               *offset, blocks << 2, start_block, offset)) {
1327 +                       ERROR("Unable to read block list [%llx:%x]\n",
1328 +                               *start_block, *offset);
1329 +                       goto failure;
1330 +               }
1331 +
1332 +       for (block_listp = (unsigned int *) block_list; blocks;
1333 +                               block_listp++, blocks --)
1334 +               block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
1335 +
1336 +       return block;
1337 +
1338 +failure:
1339 +       return -1;
1340 +}
1341 +
1342 +
1343 +#define SIZE 256
1344 +
1345 +static inline int calculate_skip(int blocks) {
1346 +       int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES);
1347 +       return skip >= 7 ? 7 : skip + 1;
1348 +}
1349 +
1350 +
1351 +static int get_meta_index(struct inode *inode, int index,
1352 +               long long *index_block, int *index_offset,
1353 +               long long *data_block, char *block_list)
1354 +{
1355 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1356 +       struct squashfs_super_block *sblk = &msblk->sblk;
1357 +       int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
1358 +       int offset = 0;
1359 +       struct meta_index *meta;
1360 +       struct meta_entry *meta_entry;
1361 +       long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
1362 +       int cur_offset = SQUASHFS_I(inode)->offset;
1363 +       long long cur_data_block = SQUASHFS_I(inode)->start_block;
1364 +       int i;
1365 +
1366 +       index /= SQUASHFS_META_INDEXES * skip;
1367 +
1368 +       while ( offset < index ) {
1369 +               meta = locate_meta_index(inode, index, offset + 1);
1370 +
1371 +               if (meta == NULL) {
1372 +                       if ((meta = empty_meta_index(inode, offset + 1,
1373 +                                                       skip)) == NULL)
1374 +                               goto all_done;
1375 +               } else {
1376 +                       offset = index < meta->offset + meta->entries ? index :
1377 +                               meta->offset + meta->entries - 1;
1378 +                       meta_entry = &meta->meta_entry[offset - meta->offset];
1379 +                       cur_index_block = meta_entry->index_block + sblk->inode_table_start;
1380 +                       cur_offset = meta_entry->offset;
1381 +                       cur_data_block = meta_entry->data_block;
1382 +                       TRACE("get_meta_index: offset %d, meta->offset %d, "
1383 +                               "meta->entries %d\n", offset, meta->offset,
1384 +                               meta->entries);
1385 +                       TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
1386 +                               " data_block 0x%llx\n", cur_index_block,
1387 +                               cur_offset, cur_data_block);
1388 +               }
1389 +
1390 +               for (i = meta->offset + meta->entries; i <= index &&
1391 +                               i < meta->offset + SQUASHFS_META_ENTRIES; i++) {
1392 +                       int blocks = skip * SQUASHFS_META_INDEXES;
1393 +
1394 +                       while (blocks) {
1395 +                               int block = blocks > (SIZE >> 2) ? (SIZE >> 2) :
1396 +                                       blocks;
1397 +                               int res = read_block_index(inode->i_sb, block,
1398 +                                       block_list, &cur_index_block,
1399 +                                       &cur_offset);
1400 +
1401 +                               if (res == -1)
1402 +                                       goto failed;
1403 +
1404 +                               cur_data_block += res;
1405 +                               blocks -= block;
1406 +                       }
1407 +
1408 +                       meta_entry = &meta->meta_entry[i - meta->offset];
1409 +                       meta_entry->index_block = cur_index_block - sblk->inode_table_start;
1410 +                       meta_entry->offset = cur_offset;
1411 +                       meta_entry->data_block = cur_data_block;
1412 +                       meta->entries ++;
1413 +                       offset ++;
1414 +               }
1415 +
1416 +               TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
1417 +                               meta->offset, meta->entries);
1418 +
1419 +               release_meta_index(inode, meta);
1420 +       }
1421 +
1422 +all_done:
1423 +       *index_block = cur_index_block;
1424 +       *index_offset = cur_offset;
1425 +       *data_block = cur_data_block;
1426 +
1427 +       return offset * SQUASHFS_META_INDEXES * skip;
1428 +
1429 +failed:
1430 +       release_meta_index(inode, meta);
1431 +       return -1;
1432 +}
1433 +
1434 +
1435 +static long long read_blocklist(struct inode *inode, int index,
1436 +                               int readahead_blks, char *block_list,
1437 +                               unsigned short **block_p, unsigned int *bsize)
1438 +{
1439 +       long long block_ptr;
1440 +       int offset;
1441 +       long long block;
1442 +       int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
1443 +               block_list);
1444 +
1445 +       TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
1446 +                      " 0x%x, block 0x%llx\n", res, index, block_ptr, offset,
1447 +                      block);
1448 +
1449 +       if(res == -1)
1450 +               goto failure;
1451 +
1452 +       index -= res;
1453 +
1454 +       while ( index ) {
1455 +               int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
1456 +               int res = read_block_index(inode->i_sb, blocks, block_list,
1457 +                       &block_ptr, &offset);
1458 +               if (res == -1)
1459 +                       goto failure;
1460 +               block += res;
1461 +               index -= blocks;
1462 +       }
1463 +
1464 +       if (read_block_index(inode->i_sb, 1, block_list,
1465 +                       &block_ptr, &offset) == -1)
1466 +               goto failure;
1467 +       *bsize = *((unsigned int *) block_list);
1468 +
1469 +       return block;
1470 +
1471 +failure:
1472 +       return 0;
1473 +}
1474 +
1475 +
1476 +static int squashfs_readpage(struct file *file, struct page *page)
1477 +{
1478 +       struct inode *inode = page->mapping->host;
1479 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1480 +       struct squashfs_super_block *sblk = &msblk->sblk;
1481 +       unsigned char block_list[SIZE];
1482 +       long long block;
1483 +       unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
1484 +       int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
1485 +       void *pageaddr;
1486 +       struct squashfs_fragment_cache *fragment = NULL;
1487 +       char *data_ptr = msblk->read_page;
1488 +
1489 +       int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
1490 +       int start_index = page->index & ~mask;
1491 +       int end_index = start_index | mask;
1492 +
1493 +       TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
1494 +                                       page->index,
1495 +                                       SQUASHFS_I(inode)->start_block);
1496 +
1497 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1498 +                                       PAGE_CACHE_SHIFT))
1499 +               goto skip_read;
1500 +
1501 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1502 +                                       || index < (i_size_read(inode) >>
1503 +                                       sblk->block_log)) {
1504 +               if ((block = (msblk->read_blocklist)(inode, index, 1,
1505 +                                       block_list, NULL, &bsize)) == 0)
1506 +                       goto skip_read;
1507 +
1508 +               down(&msblk->read_page_mutex);
1509 +
1510 +               if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
1511 +                                       block, bsize, NULL))) {
1512 +                       ERROR("Unable to read page, block %llx, size %x\n", block,
1513 +                                       bsize);
1514 +                       up(&msblk->read_page_mutex);
1515 +                       goto skip_read;
1516 +               }
1517 +       } else {
1518 +               if ((fragment = get_cached_fragment(inode->i_sb,
1519 +                                       SQUASHFS_I(inode)->
1520 +                                       u.s1.fragment_start_block,
1521 +                                       SQUASHFS_I(inode)->u.s1.fragment_size))
1522 +                                       == NULL) {
1523 +                       ERROR("Unable to read page, block %llx, size %x\n",
1524 +                                       SQUASHFS_I(inode)->
1525 +                                       u.s1.fragment_start_block,
1526 +                                       (int) SQUASHFS_I(inode)->
1527 +                                       u.s1.fragment_size);
1528 +                       goto skip_read;
1529 +               }
1530 +               bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
1531 +                                       (i_size_read(inode) & (sblk->block_size
1532 +                                       - 1));
1533 +               byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
1534 +               data_ptr = fragment->data;
1535 +       }
1536 +
1537 +       for (i = start_index; i <= end_index && byte_offset < bytes;
1538 +                                       i++, byte_offset += PAGE_CACHE_SIZE) {
1539 +               struct page *push_page;
1540 +               int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ?
1541 +                                       PAGE_CACHE_SIZE : bytes - byte_offset;
1542 +
1543 +               TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n",
1544 +                                       bytes, i, byte_offset, available_bytes);
1545 +
1546 +               if (i == page->index)  {
1547 +                       pageaddr = kmap_atomic(page, KM_USER0);
1548 +                       memcpy(pageaddr, data_ptr + byte_offset,
1549 +                                       available_bytes);
1550 +                       memset(pageaddr + available_bytes, 0,
1551 +                                       PAGE_CACHE_SIZE - available_bytes);
1552 +                       kunmap_atomic(pageaddr, KM_USER0);
1553 +                       flush_dcache_page(page);
1554 +                       SetPageUptodate(page);
1555 +                       UnlockPage(page);
1556 +               } else if ((push_page =
1557 +                               grab_cache_page_nowait(page->mapping, i))) {
1558 +                       pageaddr = kmap_atomic(push_page, KM_USER0);
1559 +
1560 +                       memcpy(pageaddr, data_ptr + byte_offset,
1561 +                                       available_bytes);
1562 +                       memset(pageaddr + available_bytes, 0,
1563 +                                       PAGE_CACHE_SIZE - available_bytes);
1564 +                       kunmap_atomic(pageaddr, KM_USER0);
1565 +                       flush_dcache_page(push_page);
1566 +                       SetPageUptodate(push_page);
1567 +                       UnlockPage(push_page);
1568 +                       page_cache_release(push_page);
1569 +               }
1570 +       }
1571 +
1572 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1573 +                                       || index < (i_size_read(inode) >>
1574 +                                       sblk->block_log))
1575 +               up(&msblk->read_page_mutex);
1576 +       else
1577 +               release_cached_fragment(msblk, fragment);
1578 +
1579 +       return 0;
1580 +
1581 +skip_read:
1582 +       pageaddr = kmap_atomic(page, KM_USER0);
1583 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1584 +       kunmap_atomic(pageaddr, KM_USER0);
1585 +       flush_dcache_page(page);
1586 +       SetPageUptodate(page);
1587 +       UnlockPage(page);
1588 +
1589 +       return 0;
1590 +}
1591 +
1592 +
1593 +static int squashfs_readpage4K(struct file *file, struct page *page)
1594 +{
1595 +       struct inode *inode = page->mapping->host;
1596 +       struct squashfs_sb_info *msblk = &inode->i_sb->u.squashfs_sb;
1597 +       struct squashfs_super_block *sblk = &msblk->sblk;
1598 +       unsigned char block_list[SIZE];
1599 +       long long block;
1600 +       unsigned int bsize, bytes = 0;
1601 +       void *pageaddr;
1602 +
1603 +       TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
1604 +                                       page->index,
1605 +                                       SQUASHFS_I(inode)->start_block);
1606 +
1607 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1608 +                                       PAGE_CACHE_SHIFT)) {
1609 +               pageaddr = kmap_atomic(page, KM_USER0);
1610 +               goto skip_read;
1611 +       }
1612 +
1613 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1614 +                                       || page->index < (i_size_read(inode) >>
1615 +                                       sblk->block_log)) {
1616 +               block = (msblk->read_blocklist)(inode, page->index, 1,
1617 +                                       block_list, NULL, &bsize);
1618 +
1619 +               down(&msblk->read_page_mutex);
1620 +               bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
1621 +                                       bsize, NULL);
1622 +               pageaddr = kmap_atomic(page, KM_USER0);
1623 +               if (bytes)
1624 +                       memcpy(pageaddr, msblk->read_page, bytes);
1625 +               else
1626 +                       ERROR("Unable to read page, block %llx, size %x\n",
1627 +                                       block, bsize);
1628 +               up(&msblk->read_page_mutex);
1629 +       } else {
1630 +               struct squashfs_fragment_cache *fragment =
1631 +                       get_cached_fragment(inode->i_sb,
1632 +                                       SQUASHFS_I(inode)->
1633 +                                       u.s1.fragment_start_block,
1634 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1635 +               pageaddr = kmap_atomic(page, KM_USER0);
1636 +               if (fragment) {
1637 +                       bytes = i_size_read(inode) & (sblk->block_size - 1);
1638 +                       memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
1639 +                                       u.s1.fragment_offset, bytes);
1640 +                       release_cached_fragment(msblk, fragment);
1641 +               } else
1642 +                       ERROR("Unable to read page, block %llx, size %x\n",
1643 +                                       SQUASHFS_I(inode)->
1644 +                                       u.s1.fragment_start_block, (int)
1645 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1646 +       }
1647 +
1648 +skip_read:
1649 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1650 +       kunmap_atomic(pageaddr, KM_USER0);
1651 +       flush_dcache_page(page);
1652 +       SetPageUptodate(page);
1653 +       UnlockPage(page);
1654 +
1655 +       return 0;
1656 +}
1657 +
1658 +
1659 +static int get_dir_index_using_offset(struct super_block *s, long long
1660 +                               *next_block, unsigned int *next_offset,
1661 +                               long long index_start,
1662 +                               unsigned int index_offset, int i_count,
1663 +                               long long f_pos)
1664 +{
1665 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1666 +       struct squashfs_super_block *sblk = &msblk->sblk;
1667 +       int i, length = 0;
1668 +       struct squashfs_dir_index index;
1669 +
1670 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
1671 +                                       i_count, (unsigned int) f_pos);
1672 +
1673 +       f_pos -= 3;
1674 +       if (f_pos == 0)
1675 +               goto finish;
1676 +
1677 +       for (i = 0; i < i_count; i++) {
1678 +               if (msblk->swap) {
1679 +                       struct squashfs_dir_index sindex;
1680 +                       squashfs_get_cached_block(s, (char *) &sindex,
1681 +                                       index_start, index_offset,
1682 +                                       sizeof(sindex), &index_start,
1683 +                                       &index_offset);
1684 +                       SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
1685 +               } else
1686 +                       squashfs_get_cached_block(s, (char *) &index,
1687 +                                       index_start, index_offset,
1688 +                                       sizeof(index), &index_start,
1689 +                                       &index_offset);
1690 +
1691 +               if (index.index > f_pos)
1692 +                       break;
1693 +
1694 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
1695 +                                       index.size + 1, &index_start,
1696 +                                       &index_offset);
1697 +
1698 +               length = index.index;
1699 +               *next_block = index.start_block + sblk->directory_table_start;
1700 +       }
1701 +
1702 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1703 +
1704 +finish:
1705 +       return length + 3;
1706 +}
1707 +
1708 +
1709 +static int get_dir_index_using_name(struct super_block *s, long long
1710 +                               *next_block, unsigned int *next_offset,
1711 +                               long long index_start,
1712 +                               unsigned int index_offset, int i_count,
1713 +                               const char *name, int size)
1714 +{
1715 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
1716 +       struct squashfs_super_block *sblk = &msblk->sblk;
1717 +       int i, length = 0;
1718 +       char buffer[sizeof(struct squashfs_dir_index) + SQUASHFS_NAME_LEN + 1];
1719 +       struct squashfs_dir_index *index = (struct squashfs_dir_index *) buffer;
1720 +       char str[SQUASHFS_NAME_LEN + 1];
1721 +
1722 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
1723 +
1724 +       strncpy(str, name, size);
1725 +       str[size] = '\0';
1726 +
1727 +       for (i = 0; i < i_count; i++) {
1728 +               if (msblk->swap) {
1729 +                       struct squashfs_dir_index sindex;
1730 +                       squashfs_get_cached_block(s, (char *) &sindex,
1731 +                                       index_start, index_offset,
1732 +                                       sizeof(sindex), &index_start,
1733 +                                       &index_offset);
1734 +                       SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
1735 +               } else
1736 +                       squashfs_get_cached_block(s, (char *) index,
1737 +                                       index_start, index_offset,
1738 +                                       sizeof(struct squashfs_dir_index),
1739 +                                       &index_start, &index_offset);
1740 +
1741 +               squashfs_get_cached_block(s, index->name, index_start,
1742 +                                       index_offset, index->size + 1,
1743 +                                       &index_start, &index_offset);
1744 +
1745 +               index->name[index->size + 1] = '\0';
1746 +
1747 +               if (strcmp(index->name, str) > 0)
1748 +                       break;
1749 +
1750 +               length = index->index;
1751 +               *next_block = index->start_block + sblk->directory_table_start;
1752 +       }
1753 +
1754 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1755 +       return length + 3;
1756 +}
1757 +
1758 +
1759 +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
1760 +{
1761 +       struct inode *i = file->f_dentry->d_inode;
1762 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
1763 +       struct squashfs_super_block *sblk = &msblk->sblk;
1764 +       long long next_block = SQUASHFS_I(i)->start_block +
1765 +               sblk->directory_table_start;
1766 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
1767 +               dir_count;
1768 +       struct squashfs_dir_header dirh;
1769 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
1770 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1771 +
1772 +       TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
1773 +
1774 +       while(file->f_pos < 3) {
1775 +               char *name;
1776 +               int size, i_ino;
1777 +
1778 +               if(file->f_pos == 0) {
1779 +                       name = ".";
1780 +                       size = 1;
1781 +                       i_ino = i->i_ino;
1782 +               } else {
1783 +                       name = "..";
1784 +                       size = 2;
1785 +                       i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
1786 +               }
1787 +               TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
1788 +                               (unsigned int) dirent, name, size, (int)
1789 +                               file->f_pos, i_ino,
1790 +                               squashfs_filetype_table[1]);
1791 +
1792 +               if (filldir(dirent, name, size,
1793 +                               file->f_pos, i_ino,
1794 +                               squashfs_filetype_table[1]) < 0) {
1795 +                               TRACE("Filldir returned less than 0\n");
1796 +                               goto finish;
1797 +               }
1798 +               file->f_pos += size;
1799 +               dirs_read++;
1800 +       }
1801 +
1802 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
1803 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
1804 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
1805 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
1806 +                               file->f_pos);
1807 +
1808 +       while (length < i_size_read(i)) {
1809 +               /* read directory header */
1810 +               if (msblk->swap) {
1811 +                       struct squashfs_dir_header sdirh;
1812 +
1813 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
1814 +                                       next_block, next_offset, sizeof(sdirh),
1815 +                                       &next_block, &next_offset))
1816 +                               goto failed_read;
1817 +
1818 +                       length += sizeof(sdirh);
1819 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1820 +               } else {
1821 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
1822 +                                       next_block, next_offset, sizeof(dirh),
1823 +                                       &next_block, &next_offset))
1824 +                               goto failed_read;
1825 +
1826 +                       length += sizeof(dirh);
1827 +               }
1828 +
1829 +               dir_count = dirh.count + 1;
1830 +               while (dir_count--) {
1831 +                       if (msblk->swap) {
1832 +                               struct squashfs_dir_entry sdire;
1833 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1834 +                                               &sdire, next_block, next_offset,
1835 +                                               sizeof(sdire), &next_block,
1836 +                                               &next_offset))
1837 +                                       goto failed_read;
1838 +
1839 +                               length += sizeof(sdire);
1840 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1841 +                       } else {
1842 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1843 +                                               dire, next_block, next_offset,
1844 +                                               sizeof(*dire), &next_block,
1845 +                                               &next_offset))
1846 +                                       goto failed_read;
1847 +
1848 +                               length += sizeof(*dire);
1849 +                       }
1850 +
1851 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
1852 +                                               next_block, next_offset,
1853 +                                               dire->size + 1, &next_block,
1854 +                                               &next_offset))
1855 +                               goto failed_read;
1856 +
1857 +                       length += dire->size + 1;
1858 +
1859 +                       if (file->f_pos >= length)
1860 +                               continue;
1861 +
1862 +                       dire->name[dire->size + 1] = '\0';
1863 +
1864 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
1865 +                                       (unsigned int) dirent, dire->name,
1866 +                                       dire->size + 1, (int) file->f_pos,
1867 +                                       dirh.start_block, dire->offset,
1868 +                                       dirh.inode_number + dire->inode_number,
1869 +                                       squashfs_filetype_table[dire->type]);
1870 +
1871 +                       if (filldir(dirent, dire->name, dire->size + 1,
1872 +                                       file->f_pos,
1873 +                                       dirh.inode_number + dire->inode_number,
1874 +                                       squashfs_filetype_table[dire->type])
1875 +                                       < 0) {
1876 +                               TRACE("Filldir returned less than 0\n");
1877 +                               goto finish;
1878 +                       }
1879 +                       file->f_pos = length;
1880 +                       dirs_read++;
1881 +               }
1882 +       }
1883 +
1884 +finish:
1885 +       return dirs_read;
1886 +
1887 +failed_read:
1888 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
1889 +               next_offset);
1890 +       return 0;
1891 +}
1892 +
1893 +
1894 +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry)
1895 +{
1896 +       const unsigned char *name = dentry->d_name.name;
1897 +       int len = dentry->d_name.len;
1898 +       struct inode *inode = NULL;
1899 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
1900 +       struct squashfs_super_block *sblk = &msblk->sblk;
1901 +       long long next_block = SQUASHFS_I(i)->start_block +
1902 +                               sblk->directory_table_start;
1903 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
1904 +                               dir_count;
1905 +       struct squashfs_dir_header dirh;
1906 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN];
1907 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1908 +
1909 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
1910 +
1911 +       if (len > SQUASHFS_NAME_LEN)
1912 +               goto exit_loop;
1913 +
1914 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
1915 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
1916 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
1917 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
1918 +                               len);
1919 +
1920 +       while (length < i_size_read(i)) {
1921 +               /* read directory header */
1922 +               if (msblk->swap) {
1923 +                       struct squashfs_dir_header sdirh;
1924 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
1925 +                                       next_block, next_offset, sizeof(sdirh),
1926 +                                       &next_block, &next_offset))
1927 +                               goto failed_read;
1928 +
1929 +                       length += sizeof(sdirh);
1930 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1931 +               } else {
1932 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
1933 +                                       next_block, next_offset, sizeof(dirh),
1934 +                                       &next_block, &next_offset))
1935 +                               goto failed_read;
1936 +
1937 +                       length += sizeof(dirh);
1938 +               }
1939 +
1940 +               dir_count = dirh.count + 1;
1941 +               while (dir_count--) {
1942 +                       if (msblk->swap) {
1943 +                               struct squashfs_dir_entry sdire;
1944 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1945 +                                               &sdire, next_block,next_offset,
1946 +                                               sizeof(sdire), &next_block,
1947 +                                               &next_offset))
1948 +                                       goto failed_read;
1949 +
1950 +                               length += sizeof(sdire);
1951 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1952 +                       } else {
1953 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1954 +                                               dire, next_block,next_offset,
1955 +                                               sizeof(*dire), &next_block,
1956 +                                               &next_offset))
1957 +                                       goto failed_read;
1958 +
1959 +                               length += sizeof(*dire);
1960 +                       }
1961 +
1962 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
1963 +                                       next_block, next_offset, dire->size + 1,
1964 +                                       &next_block, &next_offset))
1965 +                               goto failed_read;
1966 +
1967 +                       length += dire->size + 1;
1968 +
1969 +                       if (name[0] < dire->name[0])
1970 +                               goto exit_loop;
1971 +
1972 +                       if ((len == dire->size + 1) && !strncmp(name,
1973 +                                               dire->name, len)) {
1974 +                               squashfs_inode_t ino =
1975 +                                       SQUASHFS_MKINODE(dirh.start_block,
1976 +                                       dire->offset);
1977 +
1978 +                               TRACE("calling squashfs_iget for directory "
1979 +                                       "entry %s, inode %x:%x, %d\n", name,
1980 +                                       dirh.start_block, dire->offset,
1981 +                                       dirh.inode_number + dire->inode_number);
1982 +
1983 +                               inode = (msblk->iget)(i->i_sb, ino);
1984 +
1985 +                               goto exit_loop;
1986 +                       }
1987 +               }
1988 +       }
1989 +
1990 +exit_loop:
1991 +       d_add(dentry, inode);
1992 +       return ERR_PTR(0);
1993 +
1994 +failed_read:
1995 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
1996 +               next_offset);
1997 +       goto exit_loop;
1998 +}
1999 +
2000 +
2001 +static void squashfs_put_super(struct super_block *s)
2002 +{
2003 +       int i;
2004 +
2005 +               struct squashfs_sb_info *sbi = &s->u.squashfs_sb;
2006 +               if (sbi->block_cache)
2007 +                       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
2008 +                               if (sbi->block_cache[i].block !=
2009 +                                                       SQUASHFS_INVALID_BLK)
2010 +                                       kfree(sbi->block_cache[i].data);
2011 +               if (sbi->fragment)
2012 +                       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++)
2013 +                               SQUASHFS_FREE(sbi->fragment[i].data);
2014 +               kfree(sbi->fragment);
2015 +               kfree(sbi->block_cache);
2016 +               kfree(sbi->read_data);
2017 +               kfree(sbi->read_page);
2018 +               kfree(sbi->uid);
2019 +               kfree(sbi->fragment_index);
2020 +               kfree(sbi->fragment_index_2);
2021 +               sbi->block_cache = NULL;
2022 +               sbi->uid = NULL;
2023 +               sbi->read_data = NULL;
2024 +               sbi->read_page = NULL;
2025 +               sbi->fragment = NULL;
2026 +               sbi->fragment_index = NULL;
2027 +               sbi->fragment_index_2 = NULL;
2028 +}
2029 +
2030 +
2031 +static int __init init_squashfs_fs(void)
2032 +{
2033 +
2034 +       printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
2035 +               "Phillip Lougher\n");
2036 +
2037 +       if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
2038 +               ERROR("Failed to allocate zlib workspace\n");
2039 +               return -ENOMEM;
2040 +       }
2041 +       return register_filesystem(&squashfs_fs_type);
2042 +}
2043 +
2044 +
2045 +static void __exit exit_squashfs_fs(void)
2046 +{
2047 +       vfree(stream.workspace);
2048 +       unregister_filesystem(&squashfs_fs_type);
2049 +}
2050 +
2051 +
2052 +EXPORT_NO_SYMBOLS;
2053 +
2054 +module_init(init_squashfs_fs);
2055 +module_exit(exit_squashfs_fs);
2056 +MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
2057 +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
2058 +MODULE_LICENSE("GPL");
2059 --- /dev/null
2060 +++ b/fs/squashfs/Makefile
2061 @@ -0,0 +1,11 @@
2062 +#
2063 +# Makefile for the linux squashfs routines.
2064 +#
2065 +
2066 +O_TARGET := squashfs.o
2067 +
2068 +obj-y  := inode.o squashfs2_0.o
2069 +
2070 +obj-m := $(O_TARGET)
2071 +
2072 +include $(TOPDIR)/Rules.make
2073 --- /dev/null
2074 +++ b/fs/squashfs/squashfs2_0.c
2075 @@ -0,0 +1,751 @@
2076 +/*
2077 + * Squashfs - a compressed read only filesystem for Linux
2078 + *
2079 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2080 + * Phillip Lougher <phillip@lougher.org.uk>
2081 + *
2082 + * This program is free software; you can redistribute it and/or
2083 + * modify it under the terms of the GNU General Public License
2084 + * as published by the Free Software Foundation; either version 2,
2085 + * or (at your option) any later version.
2086 + *
2087 + * This program is distributed in the hope that it will be useful,
2088 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2089 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2090 + * GNU General Public License for more details.
2091 + *
2092 + * You should have received a copy of the GNU General Public License
2093 + * along with this program; if not, write to the Free Software
2094 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2095 + *
2096 + * squashfs2_0.c
2097 + */
2098 +
2099 +#include <linux/types.h>
2100 +#include <linux/squashfs_fs.h>
2101 +#include <linux/module.h>
2102 +#include <linux/errno.h>
2103 +#include <linux/slab.h>
2104 +#include <linux/fs.h>
2105 +#include <linux/smp_lock.h>
2106 +#include <linux/locks.h>
2107 +#include <linux/init.h>
2108 +#include <linux/dcache.h>
2109 +#include <linux/wait.h>
2110 +#include <linux/zlib.h>
2111 +#include <linux/blkdev.h>
2112 +#include <linux/vmalloc.h>
2113 +#include <asm/uaccess.h>
2114 +#include <asm/semaphore.h>
2115 +#include "squashfs.h"
2116 +
2117 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
2118 +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry);
2119 +
2120 +static struct file_operations squashfs_dir_ops_2 = {
2121 +       .read = generic_read_dir,
2122 +       .readdir = squashfs_readdir_2
2123 +};
2124 +
2125 +static struct inode_operations squashfs_dir_inode_ops_2 = {
2126 +       .lookup = squashfs_lookup_2
2127 +};
2128 +
2129 +static unsigned char squashfs_filetype_table[] = {
2130 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
2131 +};
2132 +
2133 +static int read_fragment_index_table_2(struct super_block *s)
2134 +{
2135 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2136 +       struct squashfs_super_block *sblk = &msblk->sblk;
2137 +
2138 +       if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
2139 +                                       (sblk->fragments), GFP_KERNEL))) {
2140 +               ERROR("Failed to allocate uid/gid table\n");
2141 +               return 0;
2142 +       }
2143 +
2144 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
2145 +                                       !squashfs_read_data(s, (char *)
2146 +                                       msblk->fragment_index_2,
2147 +                                       sblk->fragment_table_start,
2148 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES_2
2149 +                                       (sblk->fragments) |
2150 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
2151 +               ERROR("unable to read fragment index table\n");
2152 +               return 0;
2153 +       }
2154 +
2155 +       if (msblk->swap) {
2156 +               int i;
2157 +               unsigned int fragment;
2158 +
2159 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
2160 +                                                                       i++) {
2161 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
2162 +                                               &msblk->fragment_index_2[i], 1);
2163 +                       msblk->fragment_index_2[i] = fragment;
2164 +               }
2165 +       }
2166 +
2167 +       return 1;
2168 +}
2169 +
2170 +
2171 +static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
2172 +                               long long *fragment_start_block,
2173 +                               unsigned int *fragment_size)
2174 +{
2175 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2176 +       long long start_block =
2177 +               msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
2178 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
2179 +       struct squashfs_fragment_entry_2 fragment_entry;
2180 +
2181 +       if (msblk->swap) {
2182 +               struct squashfs_fragment_entry_2 sfragment_entry;
2183 +
2184 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
2185 +                                       start_block, offset,
2186 +                                       sizeof(sfragment_entry), &start_block,
2187 +                                       &offset))
2188 +                       goto out;
2189 +               SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
2190 +       } else
2191 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
2192 +                                       start_block, offset,
2193 +                                       sizeof(fragment_entry), &start_block,
2194 +                                       &offset))
2195 +                       goto out;
2196 +
2197 +       *fragment_start_block = fragment_entry.start_block;
2198 +       *fragment_size = fragment_entry.size;
2199 +
2200 +       return 1;
2201 +
2202 +out:
2203 +       return 0;
2204 +}
2205 +
2206 +
2207 +static struct inode *squashfs_new_inode(struct super_block *s,
2208 +               struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
2209 +{
2210 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2211 +       struct squashfs_super_block *sblk = &msblk->sblk;
2212 +       struct inode *i = new_inode(s);
2213 +
2214 +       if (i) {
2215 +               i->i_ino = ino;
2216 +               i->i_mtime = sblk->mkfs_time;
2217 +               i->i_atime = sblk->mkfs_time;
2218 +               i->i_ctime = sblk->mkfs_time;
2219 +               i->i_uid = msblk->uid[inodeb->uid];
2220 +               i->i_mode = inodeb->mode;
2221 +               i->i_nlink = 1;
2222 +               i->i_size = 0;
2223 +               if (inodeb->guid == SQUASHFS_GUIDS)
2224 +                       i->i_gid = i->i_uid;
2225 +               else
2226 +                       i->i_gid = msblk->guid[inodeb->guid];
2227 +       }
2228 +
2229 +       return i;
2230 +}
2231 +
2232 +
2233 +static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
2234 +{
2235 +       struct inode *i;
2236 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2237 +       struct squashfs_super_block *sblk = &msblk->sblk;
2238 +       unsigned int block = SQUASHFS_INODE_BLK(inode) +
2239 +               sblk->inode_table_start;
2240 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
2241 +       unsigned int ino = SQUASHFS_MK_VFS_INODE(block
2242 +               - sblk->inode_table_start, offset);
2243 +       long long next_block;
2244 +       unsigned int next_offset;
2245 +       union squashfs_inode_header_2 id, sid;
2246 +       struct squashfs_base_inode_header_2 *inodeb = &id.base,
2247 +                                         *sinodeb = &sid.base;
2248 +
2249 +       TRACE("Entered squashfs_iget\n");
2250 +
2251 +       if (msblk->swap) {
2252 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
2253 +                                       offset, sizeof(*sinodeb), &next_block,
2254 +                                       &next_offset))
2255 +                       goto failed_read;
2256 +               SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
2257 +                                       sizeof(*sinodeb));
2258 +       } else
2259 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
2260 +                                       offset, sizeof(*inodeb), &next_block,
2261 +                                       &next_offset))
2262 +                       goto failed_read;
2263 +
2264 +       switch(inodeb->inode_type) {
2265 +               case SQUASHFS_FILE_TYPE: {
2266 +                       struct squashfs_reg_inode_header_2 *inodep = &id.reg;
2267 +                       struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
2268 +                       long long frag_blk;
2269 +                       unsigned int frag_size;
2270 +
2271 +                       if (msblk->swap) {
2272 +                               if (!squashfs_get_cached_block(s, (char *)
2273 +                                               sinodep, block, offset,
2274 +                                               sizeof(*sinodep), &next_block,
2275 +                                               &next_offset))
2276 +                                       goto failed_read;
2277 +                               SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
2278 +                       } else
2279 +                               if (!squashfs_get_cached_block(s, (char *)
2280 +                                               inodep, block, offset,
2281 +                                               sizeof(*inodep), &next_block,
2282 +                                               &next_offset))
2283 +                                       goto failed_read;
2284 +
2285 +                       frag_blk = SQUASHFS_INVALID_BLK;
2286 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
2287 +                                       !get_fragment_location_2(s,
2288 +                                       inodep->fragment, &frag_blk, &frag_size))
2289 +                               goto failed_read;
2290 +
2291 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2292 +                               goto failed_read1;
2293 +
2294 +                       i->i_size = inodep->file_size;
2295 +                       i->i_fop = &generic_ro_fops;
2296 +                       i->i_mode |= S_IFREG;
2297 +                       i->i_mtime = inodep->mtime;
2298 +                       i->i_atime = inodep->mtime;
2299 +                       i->i_ctime = inodep->mtime;
2300 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
2301 +                       i->i_blksize = PAGE_CACHE_SIZE;
2302 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
2303 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
2304 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
2305 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2306 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
2307 +                       SQUASHFS_I(i)->offset = next_offset;
2308 +                       if (sblk->block_size > 4096)
2309 +                               i->i_data.a_ops = &squashfs_aops;
2310 +                       else
2311 +                               i->i_data.a_ops = &squashfs_aops_4K;
2312 +
2313 +                       TRACE("File inode %x:%x, start_block %x, "
2314 +                                       "block_list_start %llx, offset %x\n",
2315 +                                       SQUASHFS_INODE_BLK(inode), offset,
2316 +                                       inodep->start_block, next_block,
2317 +                                       next_offset);
2318 +                       break;
2319 +               }
2320 +               case SQUASHFS_DIR_TYPE: {
2321 +                       struct squashfs_dir_inode_header_2 *inodep = &id.dir;
2322 +                       struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
2323 +
2324 +                       if (msblk->swap) {
2325 +                               if (!squashfs_get_cached_block(s, (char *)
2326 +                                               sinodep, block, offset,
2327 +                                               sizeof(*sinodep), &next_block,
2328 +                                               &next_offset))
2329 +                                       goto failed_read;
2330 +                               SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
2331 +                       } else
2332 +                               if (!squashfs_get_cached_block(s, (char *)
2333 +                                               inodep, block, offset,
2334 +                                               sizeof(*inodep), &next_block,
2335 +                                               &next_offset))
2336 +                                       goto failed_read;
2337 +
2338 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2339 +                               goto failed_read1;
2340 +
2341 +                       i->i_size = inodep->file_size;
2342 +                       i->i_op = &squashfs_dir_inode_ops_2;
2343 +                       i->i_fop = &squashfs_dir_ops_2;
2344 +                       i->i_mode |= S_IFDIR;
2345 +                       i->i_mtime = inodep->mtime;
2346 +                       i->i_atime = inodep->mtime;
2347 +                       i->i_ctime = inodep->mtime;
2348 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2349 +                       SQUASHFS_I(i)->offset = inodep->offset;
2350 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
2351 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2352 +
2353 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
2354 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
2355 +                                       offset, inodep->start_block,
2356 +                                       inodep->offset);
2357 +                       break;
2358 +               }
2359 +               case SQUASHFS_LDIR_TYPE: {
2360 +                       struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
2361 +                       struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
2362 +
2363 +                       if (msblk->swap) {
2364 +                               if (!squashfs_get_cached_block(s, (char *)
2365 +                                               sinodep, block, offset,
2366 +                                               sizeof(*sinodep), &next_block,
2367 +                                               &next_offset))
2368 +                                       goto failed_read;
2369 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
2370 +                                               sinodep);
2371 +                       } else
2372 +                               if (!squashfs_get_cached_block(s, (char *)
2373 +                                               inodep, block, offset,
2374 +                                               sizeof(*inodep), &next_block,
2375 +                                               &next_offset))
2376 +                                       goto failed_read;
2377 +
2378 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2379 +                               goto failed_read1;
2380 +
2381 +                       i->i_size = inodep->file_size;
2382 +                       i->i_op = &squashfs_dir_inode_ops_2;
2383 +                       i->i_fop = &squashfs_dir_ops_2;
2384 +                       i->i_mode |= S_IFDIR;
2385 +                       i->i_mtime = inodep->mtime;
2386 +                       i->i_atime = inodep->mtime;
2387 +                       i->i_ctime = inodep->mtime;
2388 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2389 +                       SQUASHFS_I(i)->offset = inodep->offset;
2390 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
2391 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
2392 +                                                               next_offset;
2393 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
2394 +                                                               inodep->i_count;
2395 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2396 +
2397 +                       TRACE("Long directory inode %x:%x, start_block %x, "
2398 +                                       "offset %x\n",
2399 +                                       SQUASHFS_INODE_BLK(inode), offset,
2400 +                                       inodep->start_block, inodep->offset);
2401 +                       break;
2402 +               }
2403 +               case SQUASHFS_SYMLINK_TYPE: {
2404 +                       struct squashfs_symlink_inode_header_2 *inodep =
2405 +                                                               &id.symlink;
2406 +                       struct squashfs_symlink_inode_header_2 *sinodep =
2407 +                                                               &sid.symlink;
2408 +
2409 +                       if (msblk->swap) {
2410 +                               if (!squashfs_get_cached_block(s, (char *)
2411 +                                               sinodep, block, offset,
2412 +                                               sizeof(*sinodep), &next_block,
2413 +                                               &next_offset))
2414 +                                       goto failed_read;
2415 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
2416 +                                                               sinodep);
2417 +                       } else
2418 +                               if (!squashfs_get_cached_block(s, (char *)
2419 +                                               inodep, block, offset,
2420 +                                               sizeof(*inodep), &next_block,
2421 +                                               &next_offset))
2422 +                                       goto failed_read;
2423 +
2424 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2425 +                               goto failed_read1;
2426 +
2427 +                       i->i_size = inodep->symlink_size;
2428 +                       i->i_op = &page_symlink_inode_operations;
2429 +                       i->i_data.a_ops = &squashfs_symlink_aops;
2430 +                       i->i_mode |= S_IFLNK;
2431 +                       SQUASHFS_I(i)->start_block = next_block;
2432 +                       SQUASHFS_I(i)->offset = next_offset;
2433 +
2434 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
2435 +                                       "offset %x\n",
2436 +                                       SQUASHFS_INODE_BLK(inode), offset,
2437 +                                       next_block, next_offset);
2438 +                       break;
2439 +                }
2440 +                case SQUASHFS_BLKDEV_TYPE:
2441 +                case SQUASHFS_CHRDEV_TYPE: {
2442 +                       struct squashfs_dev_inode_header_2 *inodep = &id.dev;
2443 +                       struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
2444 +
2445 +                       if (msblk->swap) {
2446 +                               if (!squashfs_get_cached_block(s, (char *)
2447 +                                               sinodep, block, offset,
2448 +                                               sizeof(*sinodep), &next_block,
2449 +                                               &next_offset))
2450 +                                       goto failed_read;
2451 +                               SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
2452 +                       } else
2453 +                               if (!squashfs_get_cached_block(s, (char *)
2454 +                                               inodep, block, offset,
2455 +                                               sizeof(*inodep), &next_block,
2456 +                                               &next_offset))
2457 +                                       goto failed_read;
2458 +
2459 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2460 +                               goto failed_read1;
2461 +
2462 +                       i->i_mode |= (inodeb->inode_type ==
2463 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
2464 +                                       S_IFBLK;
2465 +                       init_special_inode(i, i->i_mode, inodep->rdev);
2466 +
2467 +                       TRACE("Device inode %x:%x, rdev %x\n",
2468 +                                       SQUASHFS_INODE_BLK(inode), offset,
2469 +                                       inodep->rdev);
2470 +                       break;
2471 +                }
2472 +                case SQUASHFS_FIFO_TYPE:
2473 +                case SQUASHFS_SOCKET_TYPE: {
2474 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2475 +                               goto failed_read1;
2476 +
2477 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
2478 +                                                       ? S_IFIFO : S_IFSOCK;
2479 +                       init_special_inode(i, i->i_mode, 0);
2480 +                       break;
2481 +                }
2482 +                default:
2483 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
2484 +                                       inodeb->inode_type);
2485 +                       goto failed_read1;
2486 +       }
2487 +
2488 +       insert_inode_hash(i);
2489 +       return i;
2490 +
2491 +failed_read:
2492 +       ERROR("Unable to read inode [%x:%x]\n", block, offset);
2493 +
2494 +failed_read1:
2495 +       return NULL;
2496 +}
2497 +
2498 +
2499 +static int get_dir_index_using_offset(struct super_block *s, long long
2500 +                               *next_block, unsigned int *next_offset,
2501 +                               long long index_start,
2502 +                               unsigned int index_offset, int i_count,
2503 +                               long long f_pos)
2504 +{
2505 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2506 +       struct squashfs_super_block *sblk = &msblk->sblk;
2507 +       int i, length = 0;
2508 +       struct squashfs_dir_index_2 index;
2509 +
2510 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
2511 +                                       i_count, (unsigned int) f_pos);
2512 +
2513 +       if (f_pos == 0)
2514 +               goto finish;
2515 +
2516 +       for (i = 0; i < i_count; i++) {
2517 +               if (msblk->swap) {
2518 +                       struct squashfs_dir_index_2 sindex;
2519 +                       squashfs_get_cached_block(s, (char *) &sindex,
2520 +                                       index_start, index_offset,
2521 +                                       sizeof(sindex), &index_start,
2522 +                                       &index_offset);
2523 +                       SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
2524 +               } else
2525 +                       squashfs_get_cached_block(s, (char *) &index,
2526 +                                       index_start, index_offset,
2527 +                                       sizeof(index), &index_start,
2528 +                                       &index_offset);
2529 +
2530 +               if (index.index > f_pos)
2531 +                       break;
2532 +
2533 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
2534 +                                       index.size + 1, &index_start,
2535 +                                       &index_offset);
2536 +
2537 +               length = index.index;
2538 +               *next_block = index.start_block + sblk->directory_table_start;
2539 +       }
2540 +
2541 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2542 +
2543 +finish:
2544 +       return length;
2545 +}
2546 +
2547 +
2548 +static int get_dir_index_using_name(struct super_block *s, long long
2549 +                               *next_block, unsigned int *next_offset,
2550 +                               long long index_start,
2551 +                               unsigned int index_offset, int i_count,
2552 +                               const char *name, int size)
2553 +{
2554 +       struct squashfs_sb_info *msblk = &s->u.squashfs_sb;
2555 +       struct squashfs_super_block *sblk = &msblk->sblk;
2556 +       int i, length = 0;
2557 +       char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1];
2558 +       struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer;
2559 +       char str[SQUASHFS_NAME_LEN + 1];
2560 +
2561 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
2562 +
2563 +       strncpy(str, name, size);
2564 +       str[size] = '\0';
2565 +
2566 +       for (i = 0; i < i_count; i++) {
2567 +               if (msblk->swap) {
2568 +                       struct squashfs_dir_index_2 sindex;
2569 +                       squashfs_get_cached_block(s, (char *) &sindex,
2570 +                                       index_start, index_offset,
2571 +                                       sizeof(sindex), &index_start,
2572 +                                       &index_offset);
2573 +                       SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
2574 +               } else
2575 +                       squashfs_get_cached_block(s, (char *) index,
2576 +                                       index_start, index_offset,
2577 +                                       sizeof(struct squashfs_dir_index_2),
2578 +                                       &index_start, &index_offset);
2579 +
2580 +               squashfs_get_cached_block(s, index->name, index_start,
2581 +                                       index_offset, index->size + 1,
2582 +                                       &index_start, &index_offset);
2583 +
2584 +               index->name[index->size + 1] = '\0';
2585 +
2586 +               if (strcmp(index->name, str) > 0)
2587 +                       break;
2588 +
2589 +               length = index->index;
2590 +               *next_block = index->start_block + sblk->directory_table_start;
2591 +       }
2592 +
2593 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2594 +       return length;
2595 +}
2596 +
2597 +
2598 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
2599 +{
2600 +       struct inode *i = file->f_dentry->d_inode;
2601 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
2602 +       struct squashfs_super_block *sblk = &msblk->sblk;
2603 +       long long next_block = SQUASHFS_I(i)->start_block +
2604 +               sblk->directory_table_start;
2605 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
2606 +               dir_count;
2607 +       struct squashfs_dir_header_2 dirh;
2608 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1];
2609 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2610 +
2611 +       TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
2612 +
2613 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
2614 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2615 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2616 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
2617 +                               file->f_pos);
2618 +
2619 +       while (length < i_size_read(i)) {
2620 +               /* read directory header */
2621 +               if (msblk->swap) {
2622 +                       struct squashfs_dir_header_2 sdirh;
2623 +
2624 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2625 +                                       next_block, next_offset, sizeof(sdirh),
2626 +                                       &next_block, &next_offset))
2627 +                               goto failed_read;
2628 +
2629 +                       length += sizeof(sdirh);
2630 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2631 +               } else {
2632 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2633 +                                       next_block, next_offset, sizeof(dirh),
2634 +                                       &next_block, &next_offset))
2635 +                               goto failed_read;
2636 +
2637 +                       length += sizeof(dirh);
2638 +               }
2639 +
2640 +               dir_count = dirh.count + 1;
2641 +               while (dir_count--) {
2642 +                       if (msblk->swap) {
2643 +                               struct squashfs_dir_entry_2 sdire;
2644 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2645 +                                               &sdire, next_block, next_offset,
2646 +                                               sizeof(sdire), &next_block,
2647 +                                               &next_offset))
2648 +                                       goto failed_read;
2649 +
2650 +                               length += sizeof(sdire);
2651 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2652 +                       } else {
2653 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2654 +                                               dire, next_block, next_offset,
2655 +                                               sizeof(*dire), &next_block,
2656 +                                               &next_offset))
2657 +                                       goto failed_read;
2658 +
2659 +                               length += sizeof(*dire);
2660 +                       }
2661 +
2662 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2663 +                                               next_block, next_offset,
2664 +                                               dire->size + 1, &next_block,
2665 +                                               &next_offset))
2666 +                               goto failed_read;
2667 +
2668 +                       length += dire->size + 1;
2669 +
2670 +                       if (file->f_pos >= length)
2671 +                               continue;
2672 +
2673 +                       dire->name[dire->size + 1] = '\0';
2674 +
2675 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
2676 +                                       (unsigned int) dirent, dire->name,
2677 +                                       dire->size + 1, (int) file->f_pos,
2678 +                                       dirh.start_block, dire->offset,
2679 +                                       squashfs_filetype_table[dire->type]);
2680 +
2681 +                       if (filldir(dirent, dire->name, dire->size + 1,
2682 +                                       file->f_pos, SQUASHFS_MK_VFS_INODE(
2683 +                                       dirh.start_block, dire->offset),
2684 +                                       squashfs_filetype_table[dire->type])
2685 +                                       < 0) {
2686 +                               TRACE("Filldir returned less than 0\n");
2687 +                               goto finish;
2688 +                       }
2689 +                       file->f_pos = length;
2690 +                       dirs_read++;
2691 +               }
2692 +       }
2693 +
2694 +finish:
2695 +       return dirs_read;
2696 +
2697 +failed_read:
2698 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2699 +               next_offset);
2700 +       return 0;
2701 +}
2702 +
2703 +
2704 +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry)
2705 +{
2706 +       const unsigned char *name = dentry->d_name.name;
2707 +       int len = dentry->d_name.len;
2708 +       struct inode *inode = NULL;
2709 +       struct squashfs_sb_info *msblk = &i->i_sb->u.squashfs_sb;
2710 +       struct squashfs_super_block *sblk = &msblk->sblk;
2711 +       long long next_block = SQUASHFS_I(i)->start_block +
2712 +                               sblk->directory_table_start;
2713 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
2714 +                               dir_count;
2715 +       struct squashfs_dir_header_2 dirh;
2716 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN];
2717 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2718 +       int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
2719 +
2720 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
2721 +
2722 +       if (len > SQUASHFS_NAME_LEN)
2723 +               goto exit_loop;
2724 +
2725 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
2726 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2727 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2728 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
2729 +                               len);
2730 +
2731 +       while (length < i_size_read(i)) {
2732 +               /* read directory header */
2733 +               if (msblk->swap) {
2734 +                       struct squashfs_dir_header_2 sdirh;
2735 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2736 +                                       next_block, next_offset, sizeof(sdirh),
2737 +                                       &next_block, &next_offset))
2738 +                               goto failed_read;
2739 +
2740 +                       length += sizeof(sdirh);
2741 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2742 +               } else {
2743 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2744 +                                       next_block, next_offset, sizeof(dirh),
2745 +                                       &next_block, &next_offset))
2746 +                               goto failed_read;
2747 +
2748 +                       length += sizeof(dirh);
2749 +               }
2750 +
2751 +               dir_count = dirh.count + 1;
2752 +               while (dir_count--) {
2753 +                       if (msblk->swap) {
2754 +                               struct squashfs_dir_entry_2 sdire;
2755 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2756 +                                               &sdire, next_block,next_offset,
2757 +                                               sizeof(sdire), &next_block,
2758 +                                               &next_offset))
2759 +                                       goto failed_read;
2760 +
2761 +                               length += sizeof(sdire);
2762 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2763 +                       } else {
2764 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2765 +                                               dire, next_block,next_offset,
2766 +                                               sizeof(*dire), &next_block,
2767 +                                               &next_offset))
2768 +                                       goto failed_read;
2769 +
2770 +                               length += sizeof(*dire);
2771 +                       }
2772 +
2773 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2774 +                                       next_block, next_offset, dire->size + 1,
2775 +                                       &next_block, &next_offset))
2776 +                               goto failed_read;
2777 +
2778 +                       length += dire->size + 1;
2779 +
2780 +                       if (sorted && name[0] < dire->name[0])
2781 +                               goto exit_loop;
2782 +
2783 +                       if ((len == dire->size + 1) && !strncmp(name,
2784 +                                               dire->name, len)) {
2785 +                               squashfs_inode_t ino =
2786 +                                       SQUASHFS_MKINODE(dirh.start_block,
2787 +                                       dire->offset);
2788 +
2789 +                               TRACE("calling squashfs_iget for directory "
2790 +                                       "entry %s, inode %x:%x, %d\n", name,
2791 +                                       dirh.start_block, dire->offset, ino);
2792 +
2793 +                               inode = (msblk->iget)(i->i_sb, ino);
2794 +
2795 +                               goto exit_loop;
2796 +                       }
2797 +               }
2798 +       }
2799 +
2800 +exit_loop:
2801 +       d_add(dentry, inode);
2802 +       return ERR_PTR(0);
2803 +
2804 +failed_read:
2805 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2806 +               next_offset);
2807 +       goto exit_loop;
2808 +}
2809 +
2810 +
2811 +int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
2812 +{
2813 +       struct squashfs_super_block *sblk = &msblk->sblk;
2814 +
2815 +       msblk->iget = squashfs_iget_2;
2816 +       msblk->read_fragment_index_table = read_fragment_index_table_2;
2817 +
2818 +       sblk->bytes_used = sblk->bytes_used_2;
2819 +       sblk->uid_start = sblk->uid_start_2;
2820 +       sblk->guid_start = sblk->guid_start_2;
2821 +       sblk->inode_table_start = sblk->inode_table_start_2;
2822 +       sblk->directory_table_start = sblk->directory_table_start_2;
2823 +       sblk->fragment_table_start = sblk->fragment_table_start_2;
2824 +
2825 +       return 1;
2826 +}
2827 --- /dev/null
2828 +++ b/fs/squashfs/squashfs.h
2829 @@ -0,0 +1,85 @@
2830 +/*
2831 + * Squashfs - a compressed read only filesystem for Linux
2832 + *
2833 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2834 + * Phillip Lougher <phillip@lougher.org.uk>
2835 + *
2836 + * This program is free software; you can redistribute it and/or
2837 + * modify it under the terms of the GNU General Public License
2838 + * as published by the Free Software Foundation; either version 2,
2839 + * or (at your option) any later version.
2840 + *
2841 + * This program is distributed in the hope that it will be useful,
2842 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2843 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2844 + * GNU General Public License for more details.
2845 + *
2846 + * You should have received a copy of the GNU General Public License
2847 + * along with this program; if not, write to the Free Software
2848 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2849 + *
2850 + * squashfs.h
2851 + */
2852 +
2853 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
2854 +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
2855 +#endif
2856 +#ifdef SQUASHFS_TRACE
2857 +#define TRACE(s, args...)      printk(KERN_NOTICE "SQUASHFS: "s, ## args)
2858 +#else
2859 +#define TRACE(s, args...)      {}
2860 +#endif
2861 +
2862 +#define ERROR(s, args...)      printk(KERN_ERR "SQUASHFS error: "s, ## args)
2863 +
2864 +#define SERROR(s, args...)     do { \
2865 +                               if (!silent) \
2866 +                               printk(KERN_ERR "SQUASHFS error: "s, ## args);\
2867 +                               } while(0)
2868 +
2869 +#define WARNING(s, args...)    printk(KERN_WARNING "SQUASHFS: "s, ## args)
2870 +
2871 +#define SQUASHFS_I(INO)                        (&INO->u.squashfs_i)
2872 +
2873 +#define i_size_read(INO)               (INO->i_size)
2874 +
2875 +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
2876 +#define SQSH_EXTERN
2877 +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
2878 +                               long long index, unsigned int length,
2879 +                               long long *next_index);
2880 +extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
2881 +                               long long block, unsigned int offset,
2882 +                               int length, long long *next_block,
2883 +                               unsigned int *next_offset);
2884 +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
2885 +                                       squashfs_fragment_cache *fragment);
2886 +extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
2887 +                                       *s, long long start_block,
2888 +                                       int length);
2889 +extern struct address_space_operations squashfs_symlink_aops;
2890 +extern struct address_space_operations squashfs_aops;
2891 +extern struct address_space_operations squashfs_aops_4K;
2892 +extern struct file_operations squashfs_dir_ops;
2893 +extern struct inode_operations squashfs_dir_inode_ops;
2894 +#else
2895 +#define SQSH_EXTERN static
2896 +#endif
2897 +
2898 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
2899 +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
2900 +#else
2901 +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
2902 +{
2903 +       return 0;
2904 +}
2905 +#endif
2906 +
2907 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
2908 +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
2909 +#else
2910 +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
2911 +{
2912 +       return 0;
2913 +}
2914 +#endif
2915 --- a/include/linux/fs.h
2916 +++ b/include/linux/fs.h
2917 @@ -324,6 +324,7 @@ extern void set_bh_page(struct buffer_he
2918  #include <linux/usbdev_fs_i.h>
2919  #include <linux/jffs2_fs_i.h>
2920  #include <linux/cramfs_fs_sb.h>
2921 +#include <linux/squashfs_fs_i.h>
2922
2923  /*
2924   * Attribute flags.  These should be or-ed together to figure out what
2925 @@ -519,6 +520,7 @@ struct inode {
2926                 struct socket                   socket_i;
2927                 struct usbdev_inode_info        usbdev_i;
2928                 struct jffs2_inode_info         jffs2_i;
2929 +               struct squashfs_inode_info      squashfs_i;
2930                 void                            *generic_ip;
2931         } u;
2932  };
2933 @@ -736,6 +738,7 @@ struct nameidata {
2934  #include <linux/usbdev_fs_sb.h>
2935  #include <linux/cramfs_fs_sb.h>
2936  #include <linux/jffs2_fs_sb.h>
2937 +#include <linux/squashfs_fs_sb.h>
2938
2939  extern struct list_head super_blocks;
2940  extern spinlock_t sb_lock;
2941 @@ -795,6 +798,7 @@ struct super_block {
2942                 struct usbdev_sb_info   usbdevfs_sb;
2943                 struct jffs2_sb_info    jffs2_sb;
2944                 struct cramfs_sb_info   cramfs_sb;
2945 +               struct squashfs_sb_info squashfs_sb;
2946                 void                    *generic_sbp;
2947         } u;
2948         /*
2949 --- /dev/null
2950 +++ b/include/linux/squashfs_fs.h
2951 @@ -0,0 +1,915 @@
2952 +#ifndef SQUASHFS_FS
2953 +#define SQUASHFS_FS
2954 +
2955 +/*
2956 + * Squashfs
2957 + *
2958 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2959 + * Phillip Lougher <phillip@lougher.org.uk>
2960 + *
2961 + * This program is free software; you can redistribute it and/or
2962 + * modify it under the terms of the GNU General Public License
2963 + * as published by the Free Software Foundation; either version 2,
2964 + * or (at your option) any later version.
2965 + *
2966 + * This program is distributed in the hope that it will be useful,
2967 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2968 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2969 + * GNU General Public License for more details.
2970 + *
2971 + * You should have received a copy of the GNU General Public License
2972 + * along with this program; if not, write to the Free Software
2973 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2974 + *
2975 + * squashfs_fs.h
2976 + */
2977 +
2978 +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
2979 +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
2980 +#endif
2981 +
2982 +#ifdef CONFIG_SQUASHFS_VMALLOC
2983 +#define SQUASHFS_ALLOC(a)              vmalloc(a)
2984 +#define SQUASHFS_FREE(a)               vfree(a)
2985 +#else
2986 +#define SQUASHFS_ALLOC(a)              kmalloc(a, GFP_KERNEL)
2987 +#define SQUASHFS_FREE(a)               kfree(a)
2988 +#endif
2989 +#ifdef CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
2990 +#define SQUASHFS_CACHED_FRAGMENTS      CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
2991 +#else
2992 +#define SQUASHFS_CACHED_FRAGMENTS      3
2993 +#endif
2994 +#define SQUASHFS_MAJOR                 3
2995 +#define SQUASHFS_MINOR                 0
2996 +#define SQUASHFS_MAGIC                 0x73717368
2997 +#define SQUASHFS_MAGIC_SWAP            0x68737173
2998 +#define SQUASHFS_START                 0
2999 +
3000 +/* size of metadata (inode and directory) blocks */
3001 +#define SQUASHFS_METADATA_SIZE         8192
3002 +#define SQUASHFS_METADATA_LOG          13
3003 +
3004 +/* default size of data blocks */
3005 +#define SQUASHFS_FILE_SIZE             65536
3006 +#define SQUASHFS_FILE_LOG              16
3007 +
3008 +#define SQUASHFS_FILE_MAX_SIZE         65536
3009 +
3010 +/* Max number of uids and gids */
3011 +#define SQUASHFS_UIDS                  256
3012 +#define SQUASHFS_GUIDS                 255
3013 +
3014 +/* Max length of filename (not 255) */
3015 +#define SQUASHFS_NAME_LEN              256
3016 +
3017 +#define SQUASHFS_INVALID               ((long long) 0xffffffffffff)
3018 +#define SQUASHFS_INVALID_FRAG          ((unsigned int) 0xffffffff)
3019 +#define SQUASHFS_INVALID_BLK           ((long long) -1)
3020 +#define SQUASHFS_USED_BLK              ((long long) -2)
3021 +
3022 +/* Filesystem flags */
3023 +#define SQUASHFS_NOI                   0
3024 +#define SQUASHFS_NOD                   1
3025 +#define SQUASHFS_CHECK                 2
3026 +#define SQUASHFS_NOF                   3
3027 +#define SQUASHFS_NO_FRAG               4
3028 +#define SQUASHFS_ALWAYS_FRAG           5
3029 +#define SQUASHFS_DUPLICATE             6
3030 +
3031 +#define SQUASHFS_BIT(flag, bit)                ((flag >> bit) & 1)
3032 +
3033 +#define SQUASHFS_UNCOMPRESSED_INODES(flags)    SQUASHFS_BIT(flags, \
3034 +                                               SQUASHFS_NOI)
3035 +
3036 +#define SQUASHFS_UNCOMPRESSED_DATA(flags)      SQUASHFS_BIT(flags, \
3037 +                                               SQUASHFS_NOD)
3038 +
3039 +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
3040 +                                               SQUASHFS_NOF)
3041 +
3042 +#define SQUASHFS_NO_FRAGMENTS(flags)           SQUASHFS_BIT(flags, \
3043 +                                               SQUASHFS_NO_FRAG)
3044 +
3045 +#define SQUASHFS_ALWAYS_FRAGMENTS(flags)       SQUASHFS_BIT(flags, \
3046 +                                               SQUASHFS_ALWAYS_FRAG)
3047 +
3048 +#define SQUASHFS_DUPLICATES(flags)             SQUASHFS_BIT(flags, \
3049 +                                               SQUASHFS_DUPLICATE)
3050 +
3051 +#define SQUASHFS_CHECK_DATA(flags)             SQUASHFS_BIT(flags, \
3052 +                                               SQUASHFS_CHECK)
3053 +
3054 +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
3055 +               duplicate_checking)     (noi | (nod << 1) | (check_data << 2) \
3056 +               | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
3057 +               (duplicate_checking << 6))
3058 +
3059 +/* Max number of types and file types */
3060 +#define SQUASHFS_DIR_TYPE              1
3061 +#define SQUASHFS_FILE_TYPE             2
3062 +#define SQUASHFS_SYMLINK_TYPE          3
3063 +#define SQUASHFS_BLKDEV_TYPE           4
3064 +#define SQUASHFS_CHRDEV_TYPE           5
3065 +#define SQUASHFS_FIFO_TYPE             6
3066 +#define SQUASHFS_SOCKET_TYPE           7
3067 +#define SQUASHFS_LDIR_TYPE             8
3068 +#define SQUASHFS_LREG_TYPE             9
3069 +
3070 +/* 1.0 filesystem type definitions */
3071 +#define SQUASHFS_TYPES                 5
3072 +#define SQUASHFS_IPC_TYPE              0
3073 +
3074 +/* Flag whether block is compressed or uncompressed, bit is set if block is
3075 + * uncompressed */
3076 +#define SQUASHFS_COMPRESSED_BIT                (1 << 15)
3077 +
3078 +#define SQUASHFS_COMPRESSED_SIZE(B)    (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
3079 +               (B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)
3080 +
3081 +#define SQUASHFS_COMPRESSED(B)         (!((B) & SQUASHFS_COMPRESSED_BIT))
3082 +
3083 +#define SQUASHFS_COMPRESSED_BIT_BLOCK          (1 << 24)
3084 +
3085 +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)      (((B) & \
3086 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
3087 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
3088 +
3089 +#define SQUASHFS_COMPRESSED_BLOCK(B)   (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
3090 +
3091 +/*
3092 + * Inode number ops.  Inodes consist of a compressed block number, and an
3093 + * uncompressed  offset within that block
3094 + */
3095 +#define SQUASHFS_INODE_BLK(a)          ((unsigned int) ((a) >> 16))
3096 +
3097 +#define SQUASHFS_INODE_OFFSET(a)       ((unsigned int) ((a) & 0xffff))
3098 +
3099 +#define SQUASHFS_MKINODE(A, B)         ((squashfs_inode_t)(((squashfs_inode_t) (A)\
3100 +                                       << 16) + (B)))
3101 +
3102 +/* Compute 32 bit VFS inode number from squashfs inode number */
3103 +#define SQUASHFS_MK_VFS_INODE(a, b)    ((unsigned int) (((a) << 8) + \
3104 +                                       ((b) >> 2) + 1))
3105 +/* XXX */
3106 +
3107 +/* Translate between VFS mode and squashfs mode */
3108 +#define SQUASHFS_MODE(a)               ((a) & 0xfff)
3109 +
3110 +/* fragment and fragment table defines */
3111 +#define SQUASHFS_FRAGMENT_BYTES(A)     (A * sizeof(struct squashfs_fragment_entry))
3112 +
3113 +#define SQUASHFS_FRAGMENT_INDEX(A)     (SQUASHFS_FRAGMENT_BYTES(A) / \
3114 +                                       SQUASHFS_METADATA_SIZE)
3115 +
3116 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)      (SQUASHFS_FRAGMENT_BYTES(A) % \
3117 +                                               SQUASHFS_METADATA_SIZE)
3118 +
3119 +#define SQUASHFS_FRAGMENT_INDEXES(A)   ((SQUASHFS_FRAGMENT_BYTES(A) + \
3120 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3121 +                                       SQUASHFS_METADATA_SIZE)
3122 +
3123 +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)       (SQUASHFS_FRAGMENT_INDEXES(A) *\
3124 +                                               sizeof(long long))
3125 +
3126 +/* cached data constants for filesystem */
3127 +#define SQUASHFS_CACHED_BLKS           8
3128 +
3129 +#define SQUASHFS_MAX_FILE_SIZE_LOG     64
3130 +
3131 +#define SQUASHFS_MAX_FILE_SIZE         ((long long) 1 << \
3132 +                                       (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
3133 +
3134 +#define SQUASHFS_MARKER_BYTE           0xff
3135 +
3136 +/* meta index cache */
3137 +#define SQUASHFS_META_INDEXES  (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
3138 +#define SQUASHFS_META_ENTRIES  31
3139 +#define SQUASHFS_META_NUMBER   8
3140 +#define SQUASHFS_SLOTS         4
3141 +
3142 +struct meta_entry {
3143 +       long long               data_block;
3144 +       unsigned int            index_block;
3145 +       unsigned short          offset;
3146 +       unsigned short          pad;
3147 +};
3148 +
3149 +struct meta_index {
3150 +       unsigned int            inode_number;
3151 +       unsigned int            offset;
3152 +       unsigned short          entries;
3153 +       unsigned short          skip;
3154 +       unsigned short          locked;
3155 +       unsigned short          pad;
3156 +       struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
3157 +};
3158 +
3159 +
3160 +/*
3161 + * definitions for structures on disk
3162 + */
3163 +
3164 +typedef long long              squashfs_block_t;
3165 +typedef long long              squashfs_inode_t;
3166 +
3167 +struct squashfs_super_block {
3168 +       unsigned int            s_magic;
3169 +       unsigned int            inodes;
3170 +       unsigned int            bytes_used_2;
3171 +       unsigned int            uid_start_2;
3172 +       unsigned int            guid_start_2;
3173 +       unsigned int            inode_table_start_2;
3174 +       unsigned int            directory_table_start_2;
3175 +       unsigned int            s_major:16;
3176 +       unsigned int            s_minor:16;
3177 +       unsigned int            block_size_1:16;
3178 +       unsigned int            block_log:16;
3179 +       unsigned int            flags:8;
3180 +       unsigned int            no_uids:8;
3181 +       unsigned int            no_guids:8;
3182 +       unsigned int            mkfs_time /* time of filesystem creation */;
3183 +       squashfs_inode_t        root_inode;
3184 +       unsigned int            block_size;
3185 +       unsigned int            fragments;
3186 +       unsigned int            fragment_table_start_2;
3187 +       long long               bytes_used;
3188 +       long long               uid_start;
3189 +       long long               guid_start;
3190 +       long long               inode_table_start;
3191 +       long long               directory_table_start;
3192 +       long long               fragment_table_start;
3193 +       long long               unused;
3194 +} __attribute__ ((packed));
3195 +
3196 +struct squashfs_dir_index {
3197 +       unsigned int            index;
3198 +       unsigned int            start_block;
3199 +       unsigned char           size;
3200 +       unsigned char           name[0];
3201 +} __attribute__ ((packed));
3202 +
3203 +#define SQUASHFS_BASE_INODE_HEADER             \
3204 +       unsigned int            inode_type:4;   \
3205 +       unsigned int            mode:12;        \
3206 +       unsigned int            uid:8;          \
3207 +       unsigned int            guid:8;         \
3208 +       unsigned int            mtime;          \
3209 +       unsigned int            inode_number;
3210 +
3211 +struct squashfs_base_inode_header {
3212 +       SQUASHFS_BASE_INODE_HEADER;
3213 +} __attribute__ ((packed));
3214 +
3215 +struct squashfs_ipc_inode_header {
3216 +       SQUASHFS_BASE_INODE_HEADER;
3217 +       unsigned int            nlink;
3218 +} __attribute__ ((packed));
3219 +
3220 +struct squashfs_dev_inode_header {
3221 +       SQUASHFS_BASE_INODE_HEADER;
3222 +       unsigned int            nlink;
3223 +       unsigned short          rdev;
3224 +} __attribute__ ((packed));
3225 +
3226 +struct squashfs_symlink_inode_header {
3227 +       SQUASHFS_BASE_INODE_HEADER;
3228 +       unsigned int            nlink;
3229 +       unsigned short          symlink_size;
3230 +       char                    symlink[0];
3231 +} __attribute__ ((packed));
3232 +
3233 +struct squashfs_reg_inode_header {
3234 +       SQUASHFS_BASE_INODE_HEADER;
3235 +       squashfs_block_t        start_block;
3236 +       unsigned int            fragment;
3237 +       unsigned int            offset;
3238 +       unsigned int            file_size;
3239 +       unsigned short          block_list[0];
3240 +} __attribute__ ((packed));
3241 +
3242 +struct squashfs_lreg_inode_header {
3243 +       SQUASHFS_BASE_INODE_HEADER;
3244 +       unsigned int            nlink;
3245 +       squashfs_block_t        start_block;
3246 +       unsigned int            fragment;
3247 +       unsigned int            offset;
3248 +       long long               file_size;
3249 +       unsigned short          block_list[0];
3250 +} __attribute__ ((packed));
3251 +
3252 +struct squashfs_dir_inode_header {
3253 +       SQUASHFS_BASE_INODE_HEADER;
3254 +       unsigned int            nlink;
3255 +       unsigned int            file_size:19;
3256 +       unsigned int            offset:13;
3257 +       unsigned int            start_block;
3258 +       unsigned int            parent_inode;
3259 +} __attribute__  ((packed));
3260 +
3261 +struct squashfs_ldir_inode_header {
3262 +       SQUASHFS_BASE_INODE_HEADER;
3263 +       unsigned int            nlink;
3264 +       unsigned int            file_size:27;
3265 +       unsigned int            offset:13;
3266 +       unsigned int            start_block;
3267 +       unsigned int            i_count:16;
3268 +       unsigned int            parent_inode;
3269 +       struct squashfs_dir_index       index[0];
3270 +} __attribute__  ((packed));
3271 +
3272 +union squashfs_inode_header {
3273 +       struct squashfs_base_inode_header       base;
3274 +       struct squashfs_dev_inode_header        dev;
3275 +       struct squashfs_symlink_inode_header    symlink;
3276 +       struct squashfs_reg_inode_header        reg;
3277 +       struct squashfs_lreg_inode_header       lreg;
3278 +       struct squashfs_dir_inode_header        dir;
3279 +       struct squashfs_ldir_inode_header       ldir;
3280 +       struct squashfs_ipc_inode_header        ipc;
3281 +};
3282 +
3283 +struct squashfs_dir_entry {
3284 +       unsigned int            offset:13;
3285 +       unsigned int            type:3;
3286 +       unsigned int            size:8;
3287 +       int                     inode_number:16;
3288 +       char                    name[0];
3289 +} __attribute__ ((packed));
3290 +
3291 +struct squashfs_dir_header {
3292 +       unsigned int            count:8;
3293 +       unsigned int            start_block;
3294 +       unsigned int            inode_number;
3295 +} __attribute__ ((packed));
3296 +
3297 +struct squashfs_fragment_entry {
3298 +       long long               start_block;
3299 +       unsigned int            size;
3300 +       unsigned int            unused;
3301 +} __attribute__ ((packed));
3302 +
3303 +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
3304 +extern int squashfs_uncompress_init(void);
3305 +extern int squashfs_uncompress_exit(void);
3306 +
3307 +/*
3308 + * macros to convert each packed bitfield structure from little endian to big
3309 + * endian and vice versa.  These are needed when creating or using a filesystem
3310 + * on a machine with different byte ordering to the target architecture.
3311 + *
3312 + */
3313 +
3314 +#define SQUASHFS_SWAP_START \
3315 +       int bits;\
3316 +       int b_pos;\
3317 +       unsigned long long val;\
3318 +       unsigned char *s;\
3319 +       unsigned char *d;
3320 +
3321 +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
3322 +       SQUASHFS_SWAP_START\
3323 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
3324 +       SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
3325 +       SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
3326 +       SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
3327 +       SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
3328 +       SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
3329 +       SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
3330 +       SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
3331 +       SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
3332 +       SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
3333 +       SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\
3334 +       SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
3335 +       SQUASHFS_SWAP((s)->flags, d, 288, 8);\
3336 +       SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
3337 +       SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
3338 +       SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
3339 +       SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
3340 +       SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
3341 +       SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
3342 +       SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
3343 +       SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
3344 +       SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
3345 +       SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
3346 +       SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
3347 +       SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
3348 +       SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
3349 +       SQUASHFS_SWAP((s)->unused, d, 888, 64);\
3350 +}
3351 +
3352 +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3353 +       SQUASHFS_MEMSET(s, d, n);\
3354 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3355 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3356 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3357 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3358 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3359 +       SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
3360 +
3361 +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
3362 +       SQUASHFS_SWAP_START\
3363 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3364 +}
3365 +
3366 +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
3367 +       SQUASHFS_SWAP_START\
3368 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3369 +                       sizeof(struct squashfs_ipc_inode_header))\
3370 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3371 +}
3372 +
3373 +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
3374 +       SQUASHFS_SWAP_START\
3375 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3376 +                       sizeof(struct squashfs_dev_inode_header)); \
3377 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3378 +       SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
3379 +}
3380 +
3381 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
3382 +       SQUASHFS_SWAP_START\
3383 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3384 +                       sizeof(struct squashfs_symlink_inode_header));\
3385 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3386 +       SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
3387 +}
3388 +
3389 +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
3390 +       SQUASHFS_SWAP_START\
3391 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3392 +                       sizeof(struct squashfs_reg_inode_header));\
3393 +       SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
3394 +       SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
3395 +       SQUASHFS_SWAP((s)->offset, d, 192, 32);\
3396 +       SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
3397 +}
3398 +
3399 +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
3400 +       SQUASHFS_SWAP_START\
3401 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3402 +                       sizeof(struct squashfs_lreg_inode_header));\
3403 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3404 +       SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
3405 +       SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
3406 +       SQUASHFS_SWAP((s)->offset, d, 224, 32);\
3407 +       SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
3408 +}
3409 +
3410 +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
3411 +       SQUASHFS_SWAP_START\
3412 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3413 +                       sizeof(struct squashfs_dir_inode_header));\
3414 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3415 +       SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
3416 +       SQUASHFS_SWAP((s)->offset, d, 147, 13);\
3417 +       SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
3418 +       SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
3419 +}
3420 +
3421 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
3422 +       SQUASHFS_SWAP_START\
3423 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3424 +                       sizeof(struct squashfs_ldir_inode_header));\
3425 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3426 +       SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
3427 +       SQUASHFS_SWAP((s)->offset, d, 155, 13);\
3428 +       SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
3429 +       SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
3430 +       SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
3431 +}
3432 +
3433 +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
3434 +       SQUASHFS_SWAP_START\
3435 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
3436 +       SQUASHFS_SWAP((s)->index, d, 0, 32);\
3437 +       SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
3438 +       SQUASHFS_SWAP((s)->size, d, 64, 8);\
3439 +}
3440 +
3441 +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
3442 +       SQUASHFS_SWAP_START\
3443 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
3444 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3445 +       SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
3446 +       SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
3447 +}
3448 +
3449 +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
3450 +       SQUASHFS_SWAP_START\
3451 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
3452 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3453 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3454 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3455 +       SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
3456 +}
3457 +
3458 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
3459 +       SQUASHFS_SWAP_START\
3460 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
3461 +       SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
3462 +       SQUASHFS_SWAP((s)->size, d, 64, 32);\
3463 +}
3464 +
3465 +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
3466 +       int entry;\
3467 +       int bit_position;\
3468 +       SQUASHFS_SWAP_START\
3469 +       SQUASHFS_MEMSET(s, d, n * 2);\
3470 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3471 +                       16)\
3472 +               SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
3473 +}
3474 +
3475 +#define SQUASHFS_SWAP_INTS(s, d, n) {\
3476 +       int entry;\
3477 +       int bit_position;\
3478 +       SQUASHFS_SWAP_START\
3479 +       SQUASHFS_MEMSET(s, d, n * 4);\
3480 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3481 +                       32)\
3482 +               SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
3483 +}
3484 +
3485 +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
3486 +       int entry;\
3487 +       int bit_position;\
3488 +       SQUASHFS_SWAP_START\
3489 +       SQUASHFS_MEMSET(s, d, n * 8);\
3490 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3491 +                       64)\
3492 +               SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
3493 +}
3494 +
3495 +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
3496 +       int entry;\
3497 +       int bit_position;\
3498 +       SQUASHFS_SWAP_START\
3499 +       SQUASHFS_MEMSET(s, d, n * bits / 8);\
3500 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3501 +                       bits)\
3502 +               SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
3503 +}
3504 +
3505 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
3506 +
3507 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3508 +
3509 +struct squashfs_base_inode_header_1 {
3510 +       unsigned int            inode_type:4;
3511 +       unsigned int            mode:12; /* protection */
3512 +       unsigned int            uid:4; /* index into uid table */
3513 +       unsigned int            guid:4; /* index into guid table */
3514 +} __attribute__ ((packed));
3515 +
3516 +struct squashfs_ipc_inode_header_1 {
3517 +       unsigned int            inode_type:4;
3518 +       unsigned int            mode:12; /* protection */
3519 +       unsigned int            uid:4; /* index into uid table */
3520 +       unsigned int            guid:4; /* index into guid table */
3521 +       unsigned int            type:4;
3522 +       unsigned int            offset:4;
3523 +} __attribute__ ((packed));
3524 +
3525 +struct squashfs_dev_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 +       unsigned short          rdev;
3531 +} __attribute__ ((packed));
3532 +
3533 +struct squashfs_symlink_inode_header_1 {
3534 +       unsigned int            inode_type:4;
3535 +       unsigned int            mode:12; /* protection */
3536 +       unsigned int            uid:4; /* index into uid table */
3537 +       unsigned int            guid:4; /* index into guid table */
3538 +       unsigned short          symlink_size;
3539 +       char                    symlink[0];
3540 +} __attribute__ ((packed));
3541 +
3542 +struct squashfs_reg_inode_header_1 {
3543 +       unsigned int            inode_type:4;
3544 +       unsigned int            mode:12; /* protection */
3545 +       unsigned int            uid:4; /* index into uid table */
3546 +       unsigned int            guid:4; /* index into guid table */
3547 +       unsigned int            mtime;
3548 +       unsigned int            start_block;
3549 +       unsigned int            file_size:32;
3550 +       unsigned short          block_list[0];
3551 +} __attribute__ ((packed));
3552 +
3553 +struct squashfs_dir_inode_header_1 {
3554 +       unsigned int            inode_type:4;
3555 +       unsigned int            mode:12; /* protection */
3556 +       unsigned int            uid:4; /* index into uid table */
3557 +       unsigned int            guid:4; /* index into guid table */
3558 +       unsigned int            file_size:19;
3559 +       unsigned int            offset:13;
3560 +       unsigned int            mtime;
3561 +       unsigned int            start_block:24;
3562 +} __attribute__  ((packed));
3563 +
3564 +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \
3565 +       SQUASHFS_MEMSET(s, d, n);\
3566 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3567 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3568 +       SQUASHFS_SWAP((s)->uid, d, 16, 4);\
3569 +       SQUASHFS_SWAP((s)->guid, d, 20, 4);
3570 +
3571 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
3572 +       SQUASHFS_SWAP_START\
3573 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
3574 +}
3575 +
3576 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
3577 +       SQUASHFS_SWAP_START\
3578 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3579 +                       sizeof(struct squashfs_ipc_inode_header_1));\
3580 +       SQUASHFS_SWAP((s)->type, d, 24, 4);\
3581 +       SQUASHFS_SWAP((s)->offset, d, 28, 4);\
3582 +}
3583 +
3584 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
3585 +       SQUASHFS_SWAP_START\
3586 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3587 +                       sizeof(struct squashfs_dev_inode_header_1));\
3588 +       SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
3589 +}
3590 +
3591 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
3592 +       SQUASHFS_SWAP_START\
3593 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3594 +                       sizeof(struct squashfs_symlink_inode_header_1));\
3595 +       SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
3596 +}
3597 +
3598 +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
3599 +       SQUASHFS_SWAP_START\
3600 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3601 +                       sizeof(struct squashfs_reg_inode_header_1));\
3602 +       SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
3603 +       SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
3604 +       SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
3605 +}
3606 +
3607 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
3608 +       SQUASHFS_SWAP_START\
3609 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3610 +                       sizeof(struct squashfs_dir_inode_header_1));\
3611 +       SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
3612 +       SQUASHFS_SWAP((s)->offset, d, 43, 13);\
3613 +       SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
3614 +       SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
3615 +}
3616 +
3617 +#endif
3618 +
3619 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3620 +
3621 +struct squashfs_dir_index_2 {
3622 +       unsigned int            index:27;
3623 +       unsigned int            start_block:29;
3624 +       unsigned char           size;
3625 +       unsigned char           name[0];
3626 +} __attribute__ ((packed));
3627 +
3628 +struct squashfs_base_inode_header_2 {
3629 +       unsigned int            inode_type:4;
3630 +       unsigned int            mode:12; /* protection */
3631 +       unsigned int            uid:8; /* index into uid table */
3632 +       unsigned int            guid:8; /* index into guid table */
3633 +} __attribute__ ((packed));
3634 +
3635 +struct squashfs_ipc_inode_header_2 {
3636 +       unsigned int            inode_type:4;
3637 +       unsigned int            mode:12; /* protection */
3638 +       unsigned int            uid:8; /* index into uid table */
3639 +       unsigned int            guid:8; /* index into guid table */
3640 +} __attribute__ ((packed));
3641 +
3642 +struct squashfs_dev_inode_header_2 {
3643 +       unsigned int            inode_type:4;
3644 +       unsigned int            mode:12; /* protection */
3645 +       unsigned int            uid:8; /* index into uid table */
3646 +       unsigned int            guid:8; /* index into guid table */
3647 +       unsigned short          rdev;
3648 +} __attribute__ ((packed));
3649 +
3650 +struct squashfs_symlink_inode_header_2 {
3651 +       unsigned int            inode_type:4;
3652 +       unsigned int            mode:12; /* protection */
3653 +       unsigned int            uid:8; /* index into uid table */
3654 +       unsigned int            guid:8; /* index into guid table */
3655 +       unsigned short          symlink_size;
3656 +       char                    symlink[0];
3657 +} __attribute__ ((packed));
3658 +
3659 +struct squashfs_reg_inode_header_2 {
3660 +       unsigned int            inode_type:4;
3661 +       unsigned int            mode:12; /* protection */
3662 +       unsigned int            uid:8; /* index into uid table */
3663 +       unsigned int            guid:8; /* index into guid table */
3664 +       unsigned int            mtime;
3665 +       unsigned int            start_block;
3666 +       unsigned int            fragment;
3667 +       unsigned int            offset;
3668 +       unsigned int            file_size:32;
3669 +       unsigned short          block_list[0];
3670 +} __attribute__ ((packed));
3671 +
3672 +struct squashfs_dir_inode_header_2 {
3673 +       unsigned int            inode_type:4;
3674 +       unsigned int            mode:12; /* protection */
3675 +       unsigned int            uid:8; /* index into uid table */
3676 +       unsigned int            guid:8; /* index into guid table */
3677 +       unsigned int            file_size:19;
3678 +       unsigned int            offset:13;
3679 +       unsigned int            mtime;
3680 +       unsigned int            start_block:24;
3681 +} __attribute__  ((packed));
3682 +
3683 +struct squashfs_ldir_inode_header_2 {
3684 +       unsigned int            inode_type:4;
3685 +       unsigned int            mode:12; /* protection */
3686 +       unsigned int            uid:8; /* index into uid table */
3687 +       unsigned int            guid:8; /* index into guid table */
3688 +       unsigned int            file_size:27;
3689 +       unsigned int            offset:13;
3690 +       unsigned int            mtime;
3691 +       unsigned int            start_block:24;
3692 +       unsigned int            i_count:16;
3693 +       struct squashfs_dir_index_2     index[0];
3694 +} __attribute__  ((packed));
3695 +
3696 +union squashfs_inode_header_2 {
3697 +       struct squashfs_base_inode_header_2     base;
3698 +       struct squashfs_dev_inode_header_2      dev;
3699 +       struct squashfs_symlink_inode_header_2  symlink;
3700 +       struct squashfs_reg_inode_header_2      reg;
3701 +       struct squashfs_dir_inode_header_2      dir;
3702 +       struct squashfs_ldir_inode_header_2     ldir;
3703 +       struct squashfs_ipc_inode_header_2      ipc;
3704 +};
3705 +
3706 +struct squashfs_dir_header_2 {
3707 +       unsigned int            count:8;
3708 +       unsigned int            start_block:24;
3709 +} __attribute__ ((packed));
3710 +
3711 +struct squashfs_dir_entry_2 {
3712 +       unsigned int            offset:13;
3713 +       unsigned int            type:3;
3714 +       unsigned int            size:8;
3715 +       char                    name[0];
3716 +} __attribute__ ((packed));
3717 +
3718 +struct squashfs_fragment_entry_2 {
3719 +       unsigned int            start_block;
3720 +       unsigned int            size;
3721 +} __attribute__ ((packed));
3722 +
3723 +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3724 +       SQUASHFS_MEMSET(s, d, n);\
3725 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3726 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3727 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3728 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3729 +
3730 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
3731 +       SQUASHFS_SWAP_START\
3732 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3733 +}
3734 +
3735 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
3736 +       SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
3737 +
3738 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
3739 +       SQUASHFS_SWAP_START\
3740 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3741 +                       sizeof(struct squashfs_dev_inode_header_2)); \
3742 +       SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
3743 +}
3744 +
3745 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
3746 +       SQUASHFS_SWAP_START\
3747 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3748 +                       sizeof(struct squashfs_symlink_inode_header_2));\
3749 +       SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
3750 +}
3751 +
3752 +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
3753 +       SQUASHFS_SWAP_START\
3754 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3755 +                       sizeof(struct squashfs_reg_inode_header_2));\
3756 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3757 +       SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
3758 +       SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
3759 +       SQUASHFS_SWAP((s)->offset, d, 128, 32);\
3760 +       SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
3761 +}
3762 +
3763 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
3764 +       SQUASHFS_SWAP_START\
3765 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3766 +                       sizeof(struct squashfs_dir_inode_header_2));\
3767 +       SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
3768 +       SQUASHFS_SWAP((s)->offset, d, 51, 13);\
3769 +       SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
3770 +       SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
3771 +}
3772 +
3773 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
3774 +       SQUASHFS_SWAP_START\
3775 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3776 +                       sizeof(struct squashfs_ldir_inode_header_2));\
3777 +       SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
3778 +       SQUASHFS_SWAP((s)->offset, d, 59, 13);\
3779 +       SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
3780 +       SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
3781 +       SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
3782 +}
3783 +
3784 +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
3785 +       SQUASHFS_SWAP_START\
3786 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
3787 +       SQUASHFS_SWAP((s)->index, d, 0, 27);\
3788 +       SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
3789 +       SQUASHFS_SWAP((s)->size, d, 56, 8);\
3790 +}
3791 +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
3792 +       SQUASHFS_SWAP_START\
3793 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
3794 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3795 +       SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
3796 +}
3797 +
3798 +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
3799 +       SQUASHFS_SWAP_START\
3800 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
3801 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3802 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3803 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3804 +}
3805 +
3806 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
3807 +       SQUASHFS_SWAP_START\
3808 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
3809 +       SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
3810 +       SQUASHFS_SWAP((s)->size, d, 32, 32);\
3811 +}
3812 +
3813 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
3814 +
3815 +/* fragment and fragment table defines */
3816 +#define SQUASHFS_FRAGMENT_BYTES_2(A)   (A * sizeof(struct squashfs_fragment_entry_2))
3817 +
3818 +#define SQUASHFS_FRAGMENT_INDEX_2(A)   (SQUASHFS_FRAGMENT_BYTES_2(A) / \
3819 +                                       SQUASHFS_METADATA_SIZE)
3820 +
3821 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A)    (SQUASHFS_FRAGMENT_BYTES_2(A) % \
3822 +                                               SQUASHFS_METADATA_SIZE)
3823 +
3824 +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \
3825 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3826 +                                       SQUASHFS_METADATA_SIZE)
3827 +
3828 +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A)     (SQUASHFS_FRAGMENT_INDEXES_2(A) *\
3829 +                                               sizeof(int))
3830 +
3831 +#endif
3832 +
3833 +#ifdef __KERNEL__
3834 +
3835 +/*
3836 + * macros used to swap each structure entry, taking into account
3837 + * bitfields and different bitfield placing conventions on differing
3838 + * architectures
3839 + */
3840 +
3841 +#include <asm/byteorder.h>
3842 +
3843 +#ifdef __BIG_ENDIAN
3844 +       /* convert from little endian to big endian */
3845 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3846 +               tbits, b_pos)
3847 +#else
3848 +       /* convert from big endian to little endian */
3849 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3850 +               tbits, 64 - tbits - b_pos)
3851 +#endif
3852 +
3853 +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
3854 +       b_pos = pos % 8;\
3855 +       val = 0;\
3856 +       s = (unsigned char *)p + (pos / 8);\
3857 +       d = ((unsigned char *) &val) + 7;\
3858 +       for(bits = 0; bits < (tbits + b_pos); bits += 8) \
3859 +               *d-- = *s++;\
3860 +       value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
3861 +}
3862 +
3863 +#define SQUASHFS_MEMSET(s, d, n)       memset(s, 0, n);
3864 +
3865 +#endif
3866 +#endif
3867 --- /dev/null
3868 +++ b/include/linux/squashfs_fs_i.h
3869 @@ -0,0 +1,44 @@
3870 +#ifndef SQUASHFS_FS_I
3871 +#define SQUASHFS_FS_I
3872 +/*
3873 + * Squashfs
3874 + *
3875 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3876 + * Phillip Lougher <phillip@lougher.org.uk>
3877 + *
3878 + * This program is free software; you can redistribute it and/or
3879 + * modify it under the terms of the GNU General Public License
3880 + * as published by the Free Software Foundation; either version 2,
3881 + * or (at your option) any later version.
3882 + *
3883 + * This program is distributed in the hope that it will be useful,
3884 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3885 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3886 + * GNU General Public License for more details.
3887 + *
3888 + * You should have received a copy of the GNU General Public License
3889 + * along with this program; if not, write to the Free Software
3890 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3891 + *
3892 + * squashfs_fs_i.h
3893 + */
3894 +
3895 +struct squashfs_inode_info {
3896 +       long long       start_block;
3897 +       unsigned int    offset;
3898 +       union {
3899 +               struct {
3900 +                       long long       fragment_start_block;
3901 +                       unsigned int    fragment_size;
3902 +                       unsigned int    fragment_offset;
3903 +                       long long       block_list_start;
3904 +               } s1;
3905 +               struct {
3906 +                       long long       directory_index_start;
3907 +                       unsigned int    directory_index_offset;
3908 +                       unsigned int    directory_index_count;
3909 +                       unsigned int    parent_inode;
3910 +               } s2;
3911 +       } u;
3912 +};
3913 +#endif
3914 --- /dev/null
3915 +++ b/include/linux/squashfs_fs_sb.h
3916 @@ -0,0 +1,74 @@
3917 +#ifndef SQUASHFS_FS_SB
3918 +#define SQUASHFS_FS_SB
3919 +/*
3920 + * Squashfs
3921 + *
3922 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3923 + * Phillip Lougher <phillip@lougher.org.uk>
3924 + *
3925 + * This program is free software; you can redistribute it and/or
3926 + * modify it under the terms of the GNU General Public License
3927 + * as published by the Free Software Foundation; either version 2,
3928 + * or (at your option) any later version.
3929 + *
3930 + * This program is distributed in the hope that it will be useful,
3931 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3932 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3933 + * GNU General Public License for more details.
3934 + *
3935 + * You should have received a copy of the GNU General Public License
3936 + * along with this program; if not, write to the Free Software
3937 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3938 + *
3939 + * squashfs_fs_sb.h
3940 + */
3941 +
3942 +#include <linux/squashfs_fs.h>
3943 +
3944 +struct squashfs_cache {
3945 +       long long       block;
3946 +       int             length;
3947 +       long long       next_index;
3948 +       char            *data;
3949 +};
3950 +
3951 +struct squashfs_fragment_cache {
3952 +       long long       block;
3953 +       int             length;
3954 +       unsigned int    locked;
3955 +       char            *data;
3956 +};
3957 +
3958 +struct squashfs_sb_info {
3959 +       struct squashfs_super_block     sblk;
3960 +       int                     devblksize;
3961 +       int                     devblksize_log2;
3962 +       int                     swap;
3963 +       struct squashfs_cache   *block_cache;
3964 +       struct squashfs_fragment_cache  *fragment;
3965 +       int                     next_cache;
3966 +       int                     next_fragment;
3967 +       int                     next_meta_index;
3968 +       unsigned int            *uid;
3969 +       unsigned int            *guid;
3970 +       long long               *fragment_index;
3971 +       unsigned int            *fragment_index_2;
3972 +       unsigned int            read_size;
3973 +       char                    *read_data;
3974 +       char                    *read_page;
3975 +       struct semaphore        read_data_mutex;
3976 +       struct semaphore        read_page_mutex;
3977 +       struct semaphore        block_cache_mutex;
3978 +       struct semaphore        fragment_mutex;
3979 +       struct semaphore        meta_index_mutex;
3980 +       wait_queue_head_t       waitq;
3981 +       wait_queue_head_t       fragment_wait_queue;
3982 +       struct meta_index       *meta_index;
3983 +       struct inode            *(*iget)(struct super_block *s,  squashfs_inode_t \
3984 +                               inode);
3985 +       long long               (*read_blocklist)(struct inode *inode, int \
3986 +                               index, int readahead_blks, char *block_list, \
3987 +                               unsigned short **block_p, unsigned int *bsize);
3988 +       int                     (*read_fragment_index_table)(struct super_block *s);
3989 +};
3990 +#endif
3991 --- a/init/do_mounts.c
3992 +++ b/init/do_mounts.c
3993 @@ -16,6 +16,7 @@
3994  #include <linux/minix_fs.h>
3995  #include <linux/ext2_fs.h>
3996  #include <linux/romfs_fs.h>
3997 +#include <linux/squashfs_fs.h>
3998  #include <linux/cramfs_fs.h>
3999
4000  #define BUILD_CRAMDISK
4001 @@ -485,6 +486,7 @@ static int __init crd_load(int in_fd, in
4002   *     minix
4003   *     ext2
4004   *     romfs
4005 + *     squashfs
4006   *     cramfs
4007   *     gzip
4008   */
4009 @@ -495,6 +497,7 @@ identify_ramdisk_image(int fd, int start
4010         struct minix_super_block *minixsb;
4011         struct ext2_super_block *ext2sb;
4012         struct romfs_super_block *romfsb;
4013 +       struct squashfs_super_block *squashfsb;
4014         struct cramfs_super *cramfsb;
4015         int nblocks = -1;
4016         unsigned char *buf;
4017 @@ -506,6 +509,7 @@ identify_ramdisk_image(int fd, int start
4018         minixsb = (struct minix_super_block *) buf;
4019         ext2sb = (struct ext2_super_block *) buf;
4020         romfsb = (struct romfs_super_block *) buf;
4021 +       squashfsb = (struct squashfs_super_block *) buf;
4022         cramfsb = (struct cramfs_super *) buf;
4023         memset(buf, 0xe5, size);
4024
4025 @@ -544,6 +548,15 @@ identify_ramdisk_image(int fd, int start
4026                 goto done;
4027         }
4028
4029 +       /* squashfs is at block zero too */
4030 +       if (squashfsb->s_magic == SQUASHFS_MAGIC) {
4031 +               printk(KERN_NOTICE
4032 +                      "RAMDISK: squashfs filesystem found at block %d\n",
4033 +                      start_block);
4034 +               nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
4035 +               goto done;
4036 +       }
4037 +
4038         /*
4039          * Read block 1 to test for minix and ext2 superblock
4040          */
4041 --- a/lib/Config.in
4042 +++ b/lib/Config.in
4043 @@ -10,6 +10,7 @@ tristate 'CRC32 functions' CONFIG_CRC32
4044  # Do we need the compression support?
4045  #
4046  if [ "$CONFIG_CRAMFS" = "y" -o \
4047 +     "$CONFIG_SQUASHFS" = "y" -o \
4048       "$CONFIG_PPP_DEFLATE" = "y" -o \
4049       "$CONFIG_CRYPTO_DEFLATE" = "y" -o \
4050       "$CONFIG_JFFS2_FS" = "y" -o \
4051 @@ -17,6 +18,7 @@ if [ "$CONFIG_CRAMFS" = "y" -o \
4052     define_tristate CONFIG_ZLIB_INFLATE y
4053  else
4054    if [ "$CONFIG_CRAMFS" = "m" -o \
4055 +       "$CONFIG_SQUASHFS" = "m" -o \
4056         "$CONFIG_PPP_DEFLATE" = "m" -o \
4057         "$CONFIG_CRYPTO_DEFLATE" = "m" -o \
4058         "$CONFIG_JFFS2_FS" = "m" -o \