target/linux/generic-2.6/patches-2.6.21/001-squashfs.patch

   1 Index: linux-2.6.21.7/fs/Kconfig
   2 ===================================================================
   3 --- linux-2.6.21.7.orig/fs/Kconfig
   4 +++ linux-2.6.21.7/fs/Kconfig
   5 @@ -1371,6 +1371,71 @@ config CRAMFS
   6
   7           If unsure, say N.
   8
   9 +config SQUASHFS
  10 +       tristate "SquashFS 3.0 - Squashed file system support"
  11 +       select ZLIB_INFLATE
  12 +       help
  13 +         Saying Y here includes support for SquashFS 3.0 (a Compressed Read-Only File
  14 +         System).  Squashfs is a highly compressed read-only filesystem for Linux.
  15 +         It uses zlib compression to compress both files, inodes and directories.
  16 +         Inodes in the system are very small and all blocks are packed to minimise
  17 +         data overhead. Block sizes greater than 4K are supported up to a maximum of 64K.
  18 +         SquashFS 3.0 supports 64 bit filesystems and files (larger than 4GB), full
  19 +         uid/gid information, hard links and timestamps.
  20 +
  21 +         Squashfs is intended for general read-only filesystem use, for archival
  22 +         use (i.e. in cases where a .tar.gz file may be used), and in embedded
  23 +         systems where low overhead is needed.  Further information and filesystem tools
  24 +         are available from http://squashfs.sourceforge.net.
  25 +
  26 +         If you want to compile this as a module ( = code which can be
  27 +         inserted in and removed from the running kernel whenever you want),
  28 +         say M here and read <file:Documentation/modules.txt>.  The module
  29 +         will be called squashfs.  Note that the root file system (the one
  30 +         containing the directory /) cannot be compiled as a module.
  31 +
  32 +         If unsure, say N.
  33 +
  34 +config SQUASHFS_EMBEDDED
  35 +
  36 +       bool "Additional options for memory-constrained systems"
  37 +       depends on SQUASHFS
  38 +       default n
  39 +       help
  40 +         Saying Y here allows you to specify cache sizes and how Squashfs
  41 +         allocates memory.  This is only intended for memory constrained
  42 +         systems.
  43 +
  44 +         If unsure, say N.
  45 +
  46 +config SQUASHFS_FRAGMENT_CACHE_SIZE
  47 +       int "Number of fragments cached" if SQUASHFS_EMBEDDED
  48 +       depends on SQUASHFS
  49 +       default "3"
  50 +       help
  51 +         By default SquashFS caches the last 3 fragments read from
  52 +         the filesystem.  Increasing this amount may mean SquashFS
  53 +         has to re-read fragments less often from disk, at the expense
  54 +         of extra system memory.  Decreasing this amount will mean
  55 +         SquashFS uses less memory at the expense of extra reads from disk.
  56 +
  57 +         Note there must be at least one cached fragment.  Anything
  58 +         much more than three will probably not make much difference.
  59 +
  60 +config SQUASHFS_VMALLOC
  61 +       bool "Use Vmalloc rather than Kmalloc" if SQUASHFS_EMBEDDED
  62 +       depends on SQUASHFS
  63 +       default n
  64 +       help
  65 +         By default SquashFS uses kmalloc to obtain fragment cache memory.
  66 +         Kmalloc memory is the standard kernel allocator, but it can fail
  67 +         on memory constrained systems.  Because of the way Vmalloc works,
  68 +         Vmalloc can succeed when kmalloc fails.  Specifying this option
  69 +         will make SquashFS always use Vmalloc to allocate the
  70 +         fragment cache memory.
  71 +
  72 +         If unsure, say N.
  73 +
  74  config VXFS_FS
  75         tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
  76         depends on BLOCK
  77 Index: linux-2.6.21.7/fs/Makefile
  78 ===================================================================
  79 --- linux-2.6.21.7.orig/fs/Makefile
  80 +++ linux-2.6.21.7/fs/Makefile
  81 @@ -68,6 +68,7 @@ obj-$(CONFIG_JBD)             += jbd/
  82  obj-$(CONFIG_JBD2)             += jbd2/
  83  obj-$(CONFIG_EXT2_FS)          += ext2/
  84  obj-$(CONFIG_CRAMFS)           += cramfs/
  85 +obj-$(CONFIG_SQUASHFS)         += squashfs/
  86  obj-$(CONFIG_RAMFS)            += ramfs/
  87  obj-$(CONFIG_HUGETLBFS)                += hugetlbfs/
  88  obj-$(CONFIG_CODA_FS)          += coda/
  89 Index: linux-2.6.21.7/fs/squashfs/inode.c
  90 ===================================================================
  91 --- /dev/null
  92 +++ linux-2.6.21.7/fs/squashfs/inode.c
  93 @@ -0,0 +1,2124 @@
  94 +/*
  95 + * Squashfs - a compressed read only filesystem for Linux
  96 + *
  97 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
  98 + * Phillip Lougher <phillip@lougher.org.uk>
  99 + *
 100 + * This program is free software; you can redistribute it and/or
 101 + * modify it under the terms of the GNU General Public License
 102 + * as published by the Free Software Foundation; either version 2,
 103 + * or (at your option) any later version.
 104 + *
 105 + * This program is distributed in the hope that it will be useful,
 106 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 107 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 108 + * GNU General Public License for more details.
 109 + *
 110 + * You should have received a copy of the GNU General Public License
 111 + * along with this program; if not, write to the Free Software
 112 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 113 + *
 114 + * inode.c
 115 + */
 116 +
 117 +#include <linux/types.h>
 118 +#include <linux/squashfs_fs.h>
 119 +#include <linux/module.h>
 120 +#include <linux/errno.h>
 121 +#include <linux/slab.h>
 122 +#include <linux/fs.h>
 123 +#include <linux/smp_lock.h>
 124 +#include <linux/slab.h>
 125 +#include <linux/squashfs_fs_sb.h>
 126 +#include <linux/squashfs_fs_i.h>
 127 +#include <linux/buffer_head.h>
 128 +#include <linux/vfs.h>
 129 +#include <linux/init.h>
 130 +#include <linux/dcache.h>
 131 +#include <linux/wait.h>
 132 +#include <linux/zlib.h>
 133 +#include <linux/blkdev.h>
 134 +#include <linux/vmalloc.h>
 135 +#include <asm/uaccess.h>
 136 +#include <asm/semaphore.h>
 137 +
 138 +#include "squashfs.h"
 139 +
 140 +static void squashfs_put_super(struct super_block *);
 141 +static int squashfs_statfs(struct dentry *, struct kstatfs *);
 142 +static int squashfs_symlink_readpage(struct file *file, struct page *page);
 143 +static int squashfs_readpage(struct file *file, struct page *page);
 144 +static int squashfs_readpage4K(struct file *file, struct page *page);
 145 +static int squashfs_readdir(struct file *, void *, filldir_t);
 146 +static struct inode *squashfs_alloc_inode(struct super_block *sb);
 147 +static void squashfs_destroy_inode(struct inode *inode);
 148 +static int init_inodecache(void);
 149 +static void destroy_inodecache(void);
 150 +static struct dentry *squashfs_lookup(struct inode *, struct dentry *,
 151 +                               struct nameidata *);
 152 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode);
 153 +static long long read_blocklist(struct inode *inode, int index,
 154 +                               int readahead_blks, char *block_list,
 155 +                               unsigned short **block_p, unsigned int *bsize);
 156 +static int squashfs_get_sb(struct file_system_type *, int,
 157 +                       const char *, void *, struct vfsmount *);
 158 +
 159 +
 160 +static z_stream stream;
 161 +
 162 +static struct file_system_type squashfs_fs_type = {
 163 +       .owner = THIS_MODULE,
 164 +       .name = "squashfs",
 165 +       .get_sb = squashfs_get_sb,
 166 +       .kill_sb = kill_block_super,
 167 +       .fs_flags = FS_REQUIRES_DEV
 168 +};
 169 +
 170 +static unsigned char squashfs_filetype_table[] = {
 171 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
 172 +};
 173 +
 174 +static struct super_operations squashfs_ops = {
 175 +       .alloc_inode = squashfs_alloc_inode,
 176 +       .destroy_inode = squashfs_destroy_inode,
 177 +       .statfs = squashfs_statfs,
 178 +       .put_super = squashfs_put_super,
 179 +};
 180 +
 181 +SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = {
 182 +       .readpage = squashfs_symlink_readpage
 183 +};
 184 +
 185 +SQSH_EXTERN struct address_space_operations squashfs_aops = {
 186 +       .readpage = squashfs_readpage
 187 +};
 188 +
 189 +SQSH_EXTERN struct address_space_operations squashfs_aops_4K = {
 190 +       .readpage = squashfs_readpage4K
 191 +};
 192 +
 193 +static struct file_operations squashfs_dir_ops = {
 194 +       .read = generic_read_dir,
 195 +       .readdir = squashfs_readdir
 196 +};
 197 +
 198 +SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = {
 199 +       .lookup = squashfs_lookup
 200 +};
 201 +
 202 +
 203 +static struct buffer_head *get_block_length(struct super_block *s,
 204 +                               int *cur_index, int *offset, int *c_byte)
 205 +{
 206 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 207 +       unsigned short temp;
 208 +       struct buffer_head *bh;
 209 +
 210 +       if (!(bh = sb_bread(s, *cur_index)))
 211 +               goto out;
 212 +
 213 +       if (msblk->devblksize - *offset == 1) {
 214 +               if (msblk->swap)
 215 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 216 +                               (bh->b_data + *offset));
 217 +               else
 218 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 219 +                               (bh->b_data + *offset));
 220 +               brelse(bh);
 221 +               if (!(bh = sb_bread(s, ++(*cur_index))))
 222 +                       goto out;
 223 +               if (msblk->swap)
 224 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 225 +                               bh->b_data);
 226 +               else
 227 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 228 +                               bh->b_data);
 229 +               *c_byte = temp;
 230 +               *offset = 1;
 231 +       } else {
 232 +               if (msblk->swap) {
 233 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 234 +                               (bh->b_data + *offset));
 235 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 236 +                               (bh->b_data + *offset + 1));
 237 +               } else {
 238 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 239 +                               (bh->b_data + *offset));
 240 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 241 +                               (bh->b_data + *offset + 1));
 242 +               }
 243 +               *c_byte = temp;
 244 +               *offset += 2;
 245 +       }
 246 +
 247 +       if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) {
 248 +               if (*offset == msblk->devblksize) {
 249 +                       brelse(bh);
 250 +                       if (!(bh = sb_bread(s, ++(*cur_index))))
 251 +                               goto out;
 252 +                       *offset = 0;
 253 +               }
 254 +               if (*((unsigned char *) (bh->b_data + *offset)) !=
 255 +                                               SQUASHFS_MARKER_BYTE) {
 256 +                       ERROR("Metadata block marker corrupt @ %x\n",
 257 +                                               *cur_index);
 258 +                       brelse(bh);
 259 +                       goto out;
 260 +               }
 261 +               (*offset)++;
 262 +       }
 263 +       return bh;
 264 +
 265 +out:
 266 +       return NULL;
 267 +}
 268 +
 269 +
 270 +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer,
 271 +                       long long index, unsigned int length,
 272 +                       long long *next_index)
 273 +{
 274 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 275 +       struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
 276 +                       msblk->devblksize_log2) + 2];
 277 +       unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
 278 +       unsigned int cur_index = index >> msblk->devblksize_log2;
 279 +       int bytes, avail_bytes, b = 0, k;
 280 +       char *c_buffer;
 281 +       unsigned int compressed;
 282 +       unsigned int c_byte = length;
 283 +
 284 +       if (c_byte) {
 285 +               bytes = msblk->devblksize - offset;
 286 +               compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
 287 +               c_buffer = compressed ? msblk->read_data : buffer;
 288 +               c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
 289 +
 290 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 291 +                                       ? "" : "un", (unsigned int) c_byte);
 292 +
 293 +               if (!(bh[0] = sb_getblk(s, cur_index)))
 294 +                       goto block_release;
 295 +
 296 +               for (b = 1; bytes < c_byte; b++) {
 297 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 298 +                               goto block_release;
 299 +                       bytes += msblk->devblksize;
 300 +               }
 301 +               ll_rw_block(READ, b, bh);
 302 +       } else {
 303 +               if (!(bh[0] = get_block_length(s, &cur_index, &offset,
 304 +                                                               &c_byte)))
 305 +                       goto read_failure;
 306 +
 307 +               bytes = msblk->devblksize - offset;
 308 +               compressed = SQUASHFS_COMPRESSED(c_byte);
 309 +               c_buffer = compressed ? msblk->read_data : buffer;
 310 +               c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
 311 +
 312 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 313 +                                       ? "" : "un", (unsigned int) c_byte);
 314 +
 315 +               for (b = 1; bytes < c_byte; b++) {
 316 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 317 +                               goto block_release;
 318 +                       bytes += msblk->devblksize;
 319 +               }
 320 +               ll_rw_block(READ, b - 1, bh + 1);
 321 +       }
 322 +
 323 +       if (compressed)
 324 +               down(&msblk->read_data_mutex);
 325 +
 326 +       for (bytes = 0, k = 0; k < b; k++) {
 327 +               avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
 328 +                                       msblk->devblksize - offset :
 329 +                                       c_byte - bytes;
 330 +               wait_on_buffer(bh[k]);
 331 +               if (!buffer_uptodate(bh[k]))
 332 +                       goto block_release;
 333 +               memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
 334 +               bytes += avail_bytes;
 335 +               offset = 0;
 336 +               brelse(bh[k]);
 337 +       }
 338 +
 339 +       /*
 340 +        * uncompress block
 341 +        */
 342 +       if (compressed) {
 343 +               int zlib_err;
 344 +
 345 +               stream.next_in = c_buffer;
 346 +               stream.avail_in = c_byte;
 347 +               stream.next_out = buffer;
 348 +               stream.avail_out = msblk->read_size;
 349 +
 350 +               if (((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
 351 +                               ((zlib_err = zlib_inflate(&stream, Z_FINISH))
 352 +                                != Z_STREAM_END) || ((zlib_err =
 353 +                               zlib_inflateEnd(&stream)) != Z_OK)) {
 354 +                       ERROR("zlib_fs returned unexpected result 0x%x\n",
 355 +                               zlib_err);
 356 +                       bytes = 0;
 357 +               } else
 358 +                       bytes = stream.total_out;
 359 +
 360 +               up(&msblk->read_data_mutex);
 361 +       }
 362 +
 363 +       if (next_index)
 364 +               *next_index = index + c_byte + (length ? 0 :
 365 +                               (SQUASHFS_CHECK_DATA(msblk->sblk.flags)
 366 +                                ? 3 : 2));
 367 +       return bytes;
 368 +
 369 +block_release:
 370 +       while (--b >= 0)
 371 +               brelse(bh[b]);
 372 +
 373 +read_failure:
 374 +       ERROR("sb_bread failed reading block 0x%x\n", cur_index);
 375 +       return 0;
 376 +}
 377 +
 378 +
 379 +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
 380 +                               long long block, unsigned int offset,
 381 +                               int length, long long *next_block,
 382 +                               unsigned int *next_offset)
 383 +{
 384 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 385 +       int n, i, bytes, return_length = length;
 386 +       long long next_index;
 387 +
 388 +       TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
 389 +
 390 +       while ( 1 ) {
 391 +               for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
 392 +                       if (msblk->block_cache[i].block == block)
 393 +                               break;
 394 +
 395 +               down(&msblk->block_cache_mutex);
 396 +
 397 +               if (i == SQUASHFS_CACHED_BLKS) {
 398 +                       /* read inode header block */
 399 +                       for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS;
 400 +                                       n ; n --, i = (i + 1) %
 401 +                                       SQUASHFS_CACHED_BLKS)
 402 +                               if (msblk->block_cache[i].block !=
 403 +                                                       SQUASHFS_USED_BLK)
 404 +                                       break;
 405 +
 406 +                       if (n == 0) {
 407 +                               wait_queue_t wait;
 408 +
 409 +                               init_waitqueue_entry(&wait, current);
 410 +                               add_wait_queue(&msblk->waitq, &wait);
 411 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 412 +                               up(&msblk->block_cache_mutex);
 413 +                               schedule();
 414 +                               set_current_state(TASK_RUNNING);
 415 +                               remove_wait_queue(&msblk->waitq, &wait);
 416 +                               continue;
 417 +                       }
 418 +                       msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
 419 +
 420 +                       if (msblk->block_cache[i].block ==
 421 +                                                       SQUASHFS_INVALID_BLK) {
 422 +                               if (!(msblk->block_cache[i].data =
 423 +                                               kmalloc(SQUASHFS_METADATA_SIZE,
 424 +                                               GFP_KERNEL))) {
 425 +                                       ERROR("Failed to allocate cache"
 426 +                                                       "block\n");
 427 +                                       up(&msblk->block_cache_mutex);
 428 +                                       goto out;
 429 +                               }
 430 +                       }
 431 +
 432 +                       msblk->block_cache[i].block = SQUASHFS_USED_BLK;
 433 +                       up(&msblk->block_cache_mutex);
 434 +
 435 +                       if (!(msblk->block_cache[i].length =
 436 +                                               squashfs_read_data(s,
 437 +                                               msblk->block_cache[i].data,
 438 +                                               block, 0, &next_index))) {
 439 +                               ERROR("Unable to read cache block [%llx:%x]\n",
 440 +                                               block, offset);
 441 +                               goto out;
 442 +                       }
 443 +
 444 +                       down(&msblk->block_cache_mutex);
 445 +                       wake_up(&msblk->waitq);
 446 +                       msblk->block_cache[i].block = block;
 447 +                       msblk->block_cache[i].next_index = next_index;
 448 +                       TRACE("Read cache block [%llx:%x]\n", block, offset);
 449 +               }
 450 +
 451 +               if (msblk->block_cache[i].block != block) {
 452 +                       up(&msblk->block_cache_mutex);
 453 +                       continue;
 454 +               }
 455 +
 456 +               if ((bytes = msblk->block_cache[i].length - offset) >= length) {
 457 +                       if (buffer)
 458 +                               memcpy(buffer, msblk->block_cache[i].data +
 459 +                                               offset, length);
 460 +                       if (msblk->block_cache[i].length - offset == length) {
 461 +                               *next_block = msblk->block_cache[i].next_index;
 462 +                               *next_offset = 0;
 463 +                       } else {
 464 +                               *next_block = block;
 465 +                               *next_offset = offset + length;
 466 +                       }
 467 +                       up(&msblk->block_cache_mutex);
 468 +                       goto finish;
 469 +               } else {
 470 +                       if (buffer) {
 471 +                               memcpy(buffer, msblk->block_cache[i].data +
 472 +                                               offset, bytes);
 473 +                               buffer += bytes;
 474 +                       }
 475 +                       block = msblk->block_cache[i].next_index;
 476 +                       up(&msblk->block_cache_mutex);
 477 +                       length -= bytes;
 478 +                       offset = 0;
 479 +               }
 480 +       }
 481 +
 482 +finish:
 483 +       return return_length;
 484 +out:
 485 +       return 0;
 486 +}
 487 +
 488 +
 489 +static int get_fragment_location(struct super_block *s, unsigned int fragment,
 490 +                               long long *fragment_start_block,
 491 +                               unsigned int *fragment_size)
 492 +{
 493 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 494 +       long long start_block =
 495 +               msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
 496 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
 497 +       struct squashfs_fragment_entry fragment_entry;
 498 +
 499 +       if (msblk->swap) {
 500 +               struct squashfs_fragment_entry sfragment_entry;
 501 +
 502 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
 503 +                                       start_block, offset,
 504 +                                       sizeof(sfragment_entry), &start_block,
 505 +                                       &offset))
 506 +                       goto out;
 507 +               SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
 508 +       } else
 509 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
 510 +                                       start_block, offset,
 511 +                                       sizeof(fragment_entry), &start_block,
 512 +                                       &offset))
 513 +                       goto out;
 514 +
 515 +       *fragment_start_block = fragment_entry.start_block;
 516 +       *fragment_size = fragment_entry.size;
 517 +
 518 +       return 1;
 519 +
 520 +out:
 521 +       return 0;
 522 +}
 523 +
 524 +
 525 +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
 526 +                                       squashfs_fragment_cache *fragment)
 527 +{
 528 +       down(&msblk->fragment_mutex);
 529 +       fragment->locked --;
 530 +       wake_up(&msblk->fragment_wait_queue);
 531 +       up(&msblk->fragment_mutex);
 532 +}
 533 +
 534 +
 535 +SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
 536 +                                       *s, long long start_block,
 537 +                                       int length)
 538 +{
 539 +       int i, n;
 540 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 541 +
 542 +       while ( 1 ) {
 543 +               down(&msblk->fragment_mutex);
 544 +
 545 +               for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
 546 +                               msblk->fragment[i].block != start_block; i++);
 547 +
 548 +               if (i == SQUASHFS_CACHED_FRAGMENTS) {
 549 +                       for (i = msblk->next_fragment, n =
 550 +                               SQUASHFS_CACHED_FRAGMENTS; n &&
 551 +                               msblk->fragment[i].locked; n--, i = (i + 1) %
 552 +                               SQUASHFS_CACHED_FRAGMENTS);
 553 +
 554 +                       if (n == 0) {
 555 +                               wait_queue_t wait;
 556 +
 557 +                               init_waitqueue_entry(&wait, current);
 558 +                               add_wait_queue(&msblk->fragment_wait_queue,
 559 +                                                                       &wait);
 560 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 561 +                               up(&msblk->fragment_mutex);
 562 +                               schedule();
 563 +                               set_current_state(TASK_RUNNING);
 564 +                               remove_wait_queue(&msblk->fragment_wait_queue,
 565 +                                                                       &wait);
 566 +                               continue;
 567 +                       }
 568 +                       msblk->next_fragment = (msblk->next_fragment + 1) %
 569 +                               SQUASHFS_CACHED_FRAGMENTS;
 570 +
 571 +                       if (msblk->fragment[i].data == NULL)
 572 +                               if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
 573 +                                               (SQUASHFS_FILE_MAX_SIZE))) {
 574 +                                       ERROR("Failed to allocate fragment "
 575 +                                                       "cache block\n");
 576 +                                       up(&msblk->fragment_mutex);
 577 +                                       goto out;
 578 +                               }
 579 +
 580 +                       msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
 581 +                       msblk->fragment[i].locked = 1;
 582 +                       up(&msblk->fragment_mutex);
 583 +
 584 +                       if (!(msblk->fragment[i].length = squashfs_read_data(s,
 585 +                                               msblk->fragment[i].data,
 586 +                                               start_block, length, NULL))) {
 587 +                               ERROR("Unable to read fragment cache block "
 588 +                                                       "[%llx]\n", start_block);
 589 +                               msblk->fragment[i].locked = 0;
 590 +                               goto out;
 591 +                       }
 592 +
 593 +                       msblk->fragment[i].block = start_block;
 594 +                       TRACE("New fragment %d, start block %lld, locked %d\n",
 595 +                                               i, msblk->fragment[i].block,
 596 +                                               msblk->fragment[i].locked);
 597 +                       break;
 598 +               }
 599 +
 600 +               msblk->fragment[i].locked++;
 601 +               up(&msblk->fragment_mutex);
 602 +               TRACE("Got fragment %d, start block %lld, locked %d\n", i,
 603 +                                               msblk->fragment[i].block,
 604 +                                               msblk->fragment[i].locked);
 605 +               break;
 606 +       }
 607 +
 608 +       return &msblk->fragment[i];
 609 +
 610 +out:
 611 +       return NULL;
 612 +}
 613 +
 614 +
 615 +static struct inode *squashfs_new_inode(struct super_block *s,
 616 +               struct squashfs_base_inode_header *inodeb)
 617 +{
 618 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 619 +       struct inode *i = new_inode(s);
 620 +
 621 +       if (i) {
 622 +               i->i_ino = inodeb->inode_number;
 623 +               i->i_mtime.tv_sec = inodeb->mtime;
 624 +               i->i_atime.tv_sec = inodeb->mtime;
 625 +               i->i_ctime.tv_sec = inodeb->mtime;
 626 +               i->i_uid = msblk->uid[inodeb->uid];
 627 +               i->i_mode = inodeb->mode;
 628 +               i->i_size = 0;
 629 +               if (inodeb->guid == SQUASHFS_GUIDS)
 630 +                       i->i_gid = i->i_uid;
 631 +               else
 632 +                       i->i_gid = msblk->guid[inodeb->guid];
 633 +       }
 634 +
 635 +       return i;
 636 +}
 637 +
 638 +
 639 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode)
 640 +{
 641 +       struct inode *i;
 642 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 643 +       struct squashfs_super_block *sblk = &msblk->sblk;
 644 +       long long block = SQUASHFS_INODE_BLK(inode) +
 645 +               sblk->inode_table_start;
 646 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
 647 +       long long next_block;
 648 +       unsigned int next_offset;
 649 +       union squashfs_inode_header id, sid;
 650 +       struct squashfs_base_inode_header *inodeb = &id.base,
 651 +                                         *sinodeb = &sid.base;
 652 +
 653 +       TRACE("Entered squashfs_iget\n");
 654 +
 655 +       if (msblk->swap) {
 656 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
 657 +                                       offset, sizeof(*sinodeb), &next_block,
 658 +                                       &next_offset))
 659 +                       goto failed_read;
 660 +               SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb,
 661 +                                       sizeof(*sinodeb));
 662 +       } else
 663 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
 664 +                                       offset, sizeof(*inodeb), &next_block,
 665 +                                       &next_offset))
 666 +                       goto failed_read;
 667 +
 668 +       switch(inodeb->inode_type) {
 669 +               case SQUASHFS_FILE_TYPE: {
 670 +                       unsigned int frag_size;
 671 +                       long long frag_blk;
 672 +                       struct squashfs_reg_inode_header *inodep = &id.reg;
 673 +                       struct squashfs_reg_inode_header *sinodep = &sid.reg;
 674 +
 675 +                       if (msblk->swap) {
 676 +                               if (!squashfs_get_cached_block(s, (char *)
 677 +                                               sinodep, block, offset,
 678 +                                               sizeof(*sinodep), &next_block,
 679 +                                               &next_offset))
 680 +                                       goto failed_read;
 681 +                               SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep);
 682 +                       } else
 683 +                               if (!squashfs_get_cached_block(s, (char *)
 684 +                                               inodep, block, offset,
 685 +                                               sizeof(*inodep), &next_block,
 686 +                                               &next_offset))
 687 +                                       goto failed_read;
 688 +
 689 +                       frag_blk = SQUASHFS_INVALID_BLK;
 690 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 691 +                                       !get_fragment_location(s,
 692 +                                       inodep->fragment, &frag_blk, &frag_size))
 693 +                               goto failed_read;
 694 +
 695 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 696 +                               goto failed_read1;
 697 +
 698 +                       i->i_nlink = 1;
 699 +                       i->i_size = inodep->file_size;
 700 +                       i->i_fop = &generic_ro_fops;
 701 +                       i->i_mode |= S_IFREG;
 702 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 703 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 704 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 705 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 706 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 707 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 708 +                       SQUASHFS_I(i)->offset = next_offset;
 709 +                       if (sblk->block_size > 4096)
 710 +                               i->i_data.a_ops = &squashfs_aops;
 711 +                       else
 712 +                               i->i_data.a_ops = &squashfs_aops_4K;
 713 +
 714 +                       TRACE("File inode %x:%x, start_block %llx, "
 715 +                                       "block_list_start %llx, offset %x\n",
 716 +                                       SQUASHFS_INODE_BLK(inode), offset,
 717 +                                       inodep->start_block, next_block,
 718 +                                       next_offset);
 719 +                       break;
 720 +               }
 721 +               case SQUASHFS_LREG_TYPE: {
 722 +                       unsigned int frag_size;
 723 +                       long long frag_blk;
 724 +                       struct squashfs_lreg_inode_header *inodep = &id.lreg;
 725 +                       struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
 726 +
 727 +                       if (msblk->swap) {
 728 +                               if (!squashfs_get_cached_block(s, (char *)
 729 +                                               sinodep, block, offset,
 730 +                                               sizeof(*sinodep), &next_block,
 731 +                                               &next_offset))
 732 +                                       goto failed_read;
 733 +                               SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
 734 +                       } else
 735 +                               if (!squashfs_get_cached_block(s, (char *)
 736 +                                               inodep, block, offset,
 737 +                                               sizeof(*inodep), &next_block,
 738 +                                               &next_offset))
 739 +                                       goto failed_read;
 740 +
 741 +                       frag_blk = SQUASHFS_INVALID_BLK;
 742 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 743 +                                       !get_fragment_location(s,
 744 +                                       inodep->fragment, &frag_blk, &frag_size))
 745 +                               goto failed_read;
 746 +
 747 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 748 +                               goto failed_read1;
 749 +
 750 +                       i->i_nlink = inodep->nlink;
 751 +                       i->i_size = inodep->file_size;
 752 +                       i->i_fop = &generic_ro_fops;
 753 +                       i->i_mode |= S_IFREG;
 754 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 755 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 756 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 757 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 758 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 759 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 760 +                       SQUASHFS_I(i)->offset = next_offset;
 761 +                       if (sblk->block_size > 4096)
 762 +                               i->i_data.a_ops = &squashfs_aops;
 763 +                       else
 764 +                               i->i_data.a_ops = &squashfs_aops_4K;
 765 +
 766 +                       TRACE("File inode %x:%x, start_block %llx, "
 767 +                                       "block_list_start %llx, offset %x\n",
 768 +                                       SQUASHFS_INODE_BLK(inode), offset,
 769 +                                       inodep->start_block, next_block,
 770 +                                       next_offset);
 771 +                       break;
 772 +               }
 773 +               case SQUASHFS_DIR_TYPE: {
 774 +                       struct squashfs_dir_inode_header *inodep = &id.dir;
 775 +                       struct squashfs_dir_inode_header *sinodep = &sid.dir;
 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_DIR_INODE_HEADER(inodep, sinodep);
 784 +                       } else
 785 +                               if (!squashfs_get_cached_block(s, (char *)
 786 +                                               inodep, block, offset,
 787 +                                               sizeof(*inodep), &next_block,
 788 +                                               &next_offset))
 789 +                                       goto failed_read;
 790 +
 791 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 792 +                               goto failed_read1;
 793 +
 794 +                       i->i_nlink = inodep->nlink;
 795 +                       i->i_size = inodep->file_size;
 796 +                       i->i_op = &squashfs_dir_inode_ops;
 797 +                       i->i_fop = &squashfs_dir_ops;
 798 +                       i->i_mode |= S_IFDIR;
 799 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 800 +                       SQUASHFS_I(i)->offset = inodep->offset;
 801 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
 802 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 803 +
 804 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
 805 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
 806 +                                       offset, inodep->start_block,
 807 +                                       inodep->offset);
 808 +                       break;
 809 +               }
 810 +               case SQUASHFS_LDIR_TYPE: {
 811 +                       struct squashfs_ldir_inode_header *inodep = &id.ldir;
 812 +                       struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
 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_LDIR_INODE_HEADER(inodep,
 821 +                                               sinodep);
 822 +                       } else
 823 +                               if (!squashfs_get_cached_block(s, (char *)
 824 +                                               inodep, block, offset,
 825 +                                               sizeof(*inodep), &next_block,
 826 +                                               &next_offset))
 827 +                                       goto failed_read;
 828 +
 829 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 830 +                               goto failed_read1;
 831 +
 832 +                       i->i_nlink = inodep->nlink;
 833 +                       i->i_size = inodep->file_size;
 834 +                       i->i_op = &squashfs_dir_inode_ops;
 835 +                       i->i_fop = &squashfs_dir_ops;
 836 +                       i->i_mode |= S_IFDIR;
 837 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 838 +                       SQUASHFS_I(i)->offset = inodep->offset;
 839 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
 840 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
 841 +                                                               next_offset;
 842 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
 843 +                                                               inodep->i_count;
 844 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 845 +
 846 +                       TRACE("Long directory inode %x:%x, start_block %x, "
 847 +                                       "offset %x\n",
 848 +                                       SQUASHFS_INODE_BLK(inode), offset,
 849 +                                       inodep->start_block, inodep->offset);
 850 +                       break;
 851 +               }
 852 +               case SQUASHFS_SYMLINK_TYPE: {
 853 +                       struct squashfs_symlink_inode_header *inodep =
 854 +                                                               &id.symlink;
 855 +                       struct squashfs_symlink_inode_header *sinodep =
 856 +                                                               &sid.symlink;
 857 +
 858 +                       if (msblk->swap) {
 859 +                               if (!squashfs_get_cached_block(s, (char *)
 860 +                                               sinodep, block, offset,
 861 +                                               sizeof(*sinodep), &next_block,
 862 +                                               &next_offset))
 863 +                                       goto failed_read;
 864 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep,
 865 +                                                               sinodep);
 866 +                       } else
 867 +                               if (!squashfs_get_cached_block(s, (char *)
 868 +                                               inodep, block, offset,
 869 +                                               sizeof(*inodep), &next_block,
 870 +                                               &next_offset))
 871 +                                       goto failed_read;
 872 +
 873 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 874 +                               goto failed_read1;
 875 +
 876 +                       i->i_nlink = inodep->nlink;
 877 +                       i->i_size = inodep->symlink_size;
 878 +                       i->i_op = &page_symlink_inode_operations;
 879 +                       i->i_data.a_ops = &squashfs_symlink_aops;
 880 +                       i->i_mode |= S_IFLNK;
 881 +                       SQUASHFS_I(i)->start_block = next_block;
 882 +                       SQUASHFS_I(i)->offset = next_offset;
 883 +
 884 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
 885 +                                       "offset %x\n",
 886 +                                       SQUASHFS_INODE_BLK(inode), offset,
 887 +                                       next_block, next_offset);
 888 +                       break;
 889 +                }
 890 +                case SQUASHFS_BLKDEV_TYPE:
 891 +                case SQUASHFS_CHRDEV_TYPE: {
 892 +                       struct squashfs_dev_inode_header *inodep = &id.dev;
 893 +                       struct squashfs_dev_inode_header *sinodep = &sid.dev;
 894 +
 895 +                       if (msblk->swap) {
 896 +                               if (!squashfs_get_cached_block(s, (char *)
 897 +                                               sinodep, block, offset,
 898 +                                               sizeof(*sinodep), &next_block,
 899 +                                               &next_offset))
 900 +                                       goto failed_read;
 901 +                               SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep);
 902 +                       } else
 903 +                               if (!squashfs_get_cached_block(s, (char *)
 904 +                                               inodep, block, offset,
 905 +                                               sizeof(*inodep), &next_block,
 906 +                                               &next_offset))
 907 +                                       goto failed_read;
 908 +
 909 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 910 +                               goto failed_read1;
 911 +
 912 +                       i->i_nlink = inodep->nlink;
 913 +                       i->i_mode |= (inodeb->inode_type ==
 914 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
 915 +                                       S_IFBLK;
 916 +                       init_special_inode(i, i->i_mode,
 917 +                                       old_decode_dev(inodep->rdev));
 918 +
 919 +                       TRACE("Device inode %x:%x, rdev %x\n",
 920 +                                       SQUASHFS_INODE_BLK(inode), offset,
 921 +                                       inodep->rdev);
 922 +                       break;
 923 +                }
 924 +                case SQUASHFS_FIFO_TYPE:
 925 +                case SQUASHFS_SOCKET_TYPE: {
 926 +                       struct squashfs_ipc_inode_header *inodep = &id.ipc;
 927 +                       struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
 928 +
 929 +                       if (msblk->swap) {
 930 +                               if (!squashfs_get_cached_block(s, (char *)
 931 +                                               sinodep, block, offset,
 932 +                                               sizeof(*sinodep), &next_block,
 933 +                                               &next_offset))
 934 +                                       goto failed_read;
 935 +                               SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
 936 +                       } else
 937 +                               if (!squashfs_get_cached_block(s, (char *)
 938 +                                               inodep, block, offset,
 939 +                                               sizeof(*inodep), &next_block,
 940 +                                               &next_offset))
 941 +                                       goto failed_read;
 942 +
 943 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 944 +                               goto failed_read1;
 945 +
 946 +                       i->i_nlink = inodep->nlink;
 947 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
 948 +                                                       ? S_IFIFO : S_IFSOCK;
 949 +                       init_special_inode(i, i->i_mode, 0);
 950 +                       break;
 951 +                }
 952 +                default:
 953 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
 954 +                                       inodeb->inode_type);
 955 +                       goto failed_read1;
 956 +       }
 957 +
 958 +       insert_inode_hash(i);
 959 +       return i;
 960 +
 961 +failed_read:
 962 +       ERROR("Unable to read inode [%llx:%x]\n", block, offset);
 963 +
 964 +failed_read1:
 965 +       return NULL;
 966 +}
 967 +
 968 +
 969 +static int read_fragment_index_table(struct super_block *s)
 970 +{
 971 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 972 +       struct squashfs_super_block *sblk = &msblk->sblk;
 973 +
 974 +       /* Allocate fragment index table */
 975 +       if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES
 976 +                                       (sblk->fragments), GFP_KERNEL))) {
 977 +               ERROR("Failed to allocate uid/gid table\n");
 978 +               return 0;
 979 +       }
 980 +
 981 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) &&
 982 +                                       !squashfs_read_data(s, (char *)
 983 +                                       msblk->fragment_index,
 984 +                                       sblk->fragment_table_start,
 985 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES
 986 +                                       (sblk->fragments) |
 987 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
 988 +               ERROR("unable to read fragment index table\n");
 989 +               return 0;
 990 +       }
 991 +
 992 +       if (msblk->swap) {
 993 +               int i;
 994 +               long long fragment;
 995 +
 996 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments);
 997 +                                                                       i++) {
 998 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
 999 +                                               &msblk->fragment_index[i], 1);
1000 +                       msblk->fragment_index[i] = fragment;
1001 +               }
1002 +       }
1003 +
1004 +       return 1;
1005 +}
1006 +
1007 +
1008 +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
1009 +{
1010 +       struct squashfs_super_block *sblk = &msblk->sblk;
1011 +
1012 +       msblk->iget = squashfs_iget;
1013 +       msblk->read_blocklist = read_blocklist;
1014 +       msblk->read_fragment_index_table = read_fragment_index_table;
1015 +
1016 +       if (sblk->s_major == 1) {
1017 +               if (!squashfs_1_0_supported(msblk)) {
1018 +                       SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
1019 +                               "are unsupported\n");
1020 +                       SERROR("Please recompile with "
1021 +                               "Squashfs 1.0 support enabled\n");
1022 +                       return 0;
1023 +               }
1024 +       } else if (sblk->s_major == 2) {
1025 +               if (!squashfs_2_0_supported(msblk)) {
1026 +                       SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
1027 +                               "are unsupported\n");
1028 +                       SERROR("Please recompile with "
1029 +                               "Squashfs 2.0 support enabled\n");
1030 +                       return 0;
1031 +               }
1032 +       } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor >
1033 +                       SQUASHFS_MINOR) {
1034 +               SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
1035 +                               "filesystem\n", sblk->s_major, sblk->s_minor);
1036 +               SERROR("Please update your kernel\n");
1037 +               return 0;
1038 +       }
1039 +
1040 +       return 1;
1041 +}
1042 +
1043 +
1044 +static int squashfs_fill_super(struct super_block *s, void *data, int silent)
1045 +{
1046 +       struct squashfs_sb_info *msblk;
1047 +       struct squashfs_super_block *sblk;
1048 +       int i;
1049 +       char b[BDEVNAME_SIZE];
1050 +       struct inode *root;
1051 +
1052 +       TRACE("Entered squashfs_read_superblock\n");
1053 +
1054 +       if (!(s->s_fs_info = kmalloc(sizeof(struct squashfs_sb_info),
1055 +                                               GFP_KERNEL))) {
1056 +               ERROR("Failed to allocate superblock\n");
1057 +               goto failure;
1058 +       }
1059 +       memset(s->s_fs_info, 0, sizeof(struct squashfs_sb_info));
1060 +       msblk = s->s_fs_info;
1061 +       sblk = &msblk->sblk;
1062 +
1063 +       msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
1064 +       msblk->devblksize_log2 = ffz(~msblk->devblksize);
1065 +
1066 +       init_MUTEX(&msblk->read_data_mutex);
1067 +       init_MUTEX(&msblk->read_page_mutex);
1068 +       init_MUTEX(&msblk->block_cache_mutex);
1069 +       init_MUTEX(&msblk->fragment_mutex);
1070 +       init_MUTEX(&msblk->meta_index_mutex);
1071 +
1072 +       init_waitqueue_head(&msblk->waitq);
1073 +       init_waitqueue_head(&msblk->fragment_wait_queue);
1074 +
1075 +       if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
1076 +                                       sizeof(struct squashfs_super_block) |
1077 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1078 +               SERROR("unable to read superblock\n");
1079 +               goto failed_mount;
1080 +       }
1081 +
1082 +       /* Check it is a SQUASHFS superblock */
1083 +       msblk->swap = 0;
1084 +       if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
1085 +               if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) {
1086 +                       struct squashfs_super_block ssblk;
1087 +
1088 +                       WARNING("Mounting a different endian SQUASHFS "
1089 +                               "filesystem on %s\n", bdevname(s->s_bdev, b));
1090 +
1091 +                       SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
1092 +                       memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
1093 +                       msblk->swap = 1;
1094 +               } else  {
1095 +                       SERROR("Can't find a SQUASHFS superblock on %s\n",
1096 +                                                       bdevname(s->s_bdev, b));
1097 +                       goto failed_mount;
1098 +               }
1099 +       }
1100 +
1101 +       /* Check the MAJOR & MINOR versions */
1102 +       if(!supported_squashfs_filesystem(msblk, silent))
1103 +               goto failed_mount;
1104 +
1105 +       TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
1106 +       TRACE("Inodes are %scompressed\n",
1107 +                                       SQUASHFS_UNCOMPRESSED_INODES
1108 +                                       (sblk->flags) ? "un" : "");
1109 +       TRACE("Data is %scompressed\n",
1110 +                                       SQUASHFS_UNCOMPRESSED_DATA(sblk->flags)
1111 +                                       ? "un" : "");
1112 +       TRACE("Check data is %s present in the filesystem\n",
1113 +                                       SQUASHFS_CHECK_DATA(sblk->flags) ?
1114 +                                       "" : "not");
1115 +       TRACE("Filesystem size %lld bytes\n", sblk->bytes_used);
1116 +       TRACE("Block size %d\n", sblk->block_size);
1117 +       TRACE("Number of inodes %d\n", sblk->inodes);
1118 +       if (sblk->s_major > 1)
1119 +               TRACE("Number of fragments %d\n", sblk->fragments);
1120 +       TRACE("Number of uids %d\n", sblk->no_uids);
1121 +       TRACE("Number of gids %d\n", sblk->no_guids);
1122 +       TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
1123 +       TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
1124 +       if (sblk->s_major > 1)
1125 +               TRACE("sblk->fragment_table_start %llx\n",
1126 +                                       sblk->fragment_table_start);
1127 +       TRACE("sblk->uid_start %llx\n", sblk->uid_start);
1128 +
1129 +       s->s_flags |= MS_RDONLY;
1130 +       s->s_op = &squashfs_ops;
1131 +
1132 +       /* Init inode_table block pointer array */
1133 +       if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) *
1134 +                                       SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
1135 +               ERROR("Failed to allocate block cache\n");
1136 +               goto failed_mount;
1137 +       }
1138 +
1139 +       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
1140 +               msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
1141 +
1142 +       msblk->next_cache = 0;
1143 +
1144 +       /* Allocate read_data block */
1145 +       msblk->read_size = (sblk->block_size < SQUASHFS_METADATA_SIZE) ?
1146 +                                       SQUASHFS_METADATA_SIZE :
1147 +                                       sblk->block_size;
1148 +
1149 +       if (!(msblk->read_data = kmalloc(msblk->read_size, GFP_KERNEL))) {
1150 +               ERROR("Failed to allocate read_data block\n");
1151 +               goto failed_mount;
1152 +       }
1153 +
1154 +       /* Allocate read_page block */
1155 +       if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
1156 +               ERROR("Failed to allocate read_page block\n");
1157 +               goto failed_mount;
1158 +       }
1159 +
1160 +       /* Allocate uid and gid tables */
1161 +       if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
1162 +                                       sizeof(unsigned int), GFP_KERNEL))) {
1163 +               ERROR("Failed to allocate uid/gid table\n");
1164 +               goto failed_mount;
1165 +       }
1166 +       msblk->guid = msblk->uid + sblk->no_uids;
1167 +
1168 +       if (msblk->swap) {
1169 +               unsigned int suid[sblk->no_uids + sblk->no_guids];
1170 +
1171 +               if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
1172 +                                       ((sblk->no_uids + sblk->no_guids) *
1173 +                                        sizeof(unsigned int)) |
1174 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1175 +                       ERROR("unable to read uid/gid table\n");
1176 +                       goto failed_mount;
1177 +               }
1178 +
1179 +               SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
1180 +                       sblk->no_guids), (sizeof(unsigned int) * 8));
1181 +       } else
1182 +               if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
1183 +                                       ((sblk->no_uids + sblk->no_guids) *
1184 +                                        sizeof(unsigned int)) |
1185 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1186 +                       ERROR("unable to read uid/gid table\n");
1187 +                       goto failed_mount;
1188 +               }
1189 +
1190 +
1191 +       if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
1192 +               goto allocate_root;
1193 +
1194 +       if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
1195 +                               SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
1196 +               ERROR("Failed to allocate fragment block cache\n");
1197 +               goto failed_mount;
1198 +       }
1199 +
1200 +       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
1201 +               msblk->fragment[i].locked = 0;
1202 +               msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
1203 +               msblk->fragment[i].data = NULL;
1204 +       }
1205 +
1206 +       msblk->next_fragment = 0;
1207 +
1208 +       /* Allocate fragment index table */
1209 +       if (msblk->read_fragment_index_table(s) == 0)
1210 +               goto failed_mount;
1211 +
1212 +allocate_root:
1213 +       if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL)
1214 +               goto failed_mount;
1215 +
1216 +       if ((s->s_root = d_alloc_root(root)) == NULL) {
1217 +               ERROR("Root inode create failed\n");
1218 +               iput(root);
1219 +               goto failed_mount;
1220 +       }
1221 +
1222 +       TRACE("Leaving squashfs_read_super\n");
1223 +       return 0;
1224 +
1225 +failed_mount:
1226 +       kfree(msblk->fragment_index);
1227 +       kfree(msblk->fragment);
1228 +       kfree(msblk->uid);
1229 +       kfree(msblk->read_page);
1230 +       kfree(msblk->read_data);
1231 +       kfree(msblk->block_cache);
1232 +       kfree(msblk->fragment_index_2);
1233 +       kfree(s->s_fs_info);
1234 +       s->s_fs_info = NULL;
1235 +       return -EINVAL;
1236 +
1237 +failure:
1238 +       return -ENOMEM;
1239 +}
1240 +
1241 +
1242 +static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1243 +{
1244 +       struct squashfs_sb_info *msblk = dentry->d_inode->i_sb->s_fs_info;
1245 +       struct squashfs_super_block *sblk = &msblk->sblk;
1246 +
1247 +       TRACE("Entered squashfs_statfs\n");
1248 +
1249 +       buf->f_type = SQUASHFS_MAGIC;
1250 +       buf->f_bsize = sblk->block_size;
1251 +       buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1;
1252 +       buf->f_bfree = buf->f_bavail = 0;
1253 +       buf->f_files = sblk->inodes;
1254 +       buf->f_ffree = 0;
1255 +       buf->f_namelen = SQUASHFS_NAME_LEN;
1256 +
1257 +       return 0;
1258 +}
1259 +
1260 +
1261 +static int squashfs_symlink_readpage(struct file *file, struct page *page)
1262 +{
1263 +       struct inode *inode = page->mapping->host;
1264 +       int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
1265 +       long long block = SQUASHFS_I(inode)->start_block;
1266 +       int offset = SQUASHFS_I(inode)->offset;
1267 +       void *pageaddr = kmap(page);
1268 +
1269 +       TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
1270 +                               "%llx, offset %x\n", page->index,
1271 +                               SQUASHFS_I(inode)->start_block,
1272 +                               SQUASHFS_I(inode)->offset);
1273 +
1274 +       for (length = 0; length < index; length += bytes) {
1275 +               if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
1276 +                               block, offset, PAGE_CACHE_SIZE, &block,
1277 +                               &offset))) {
1278 +                       ERROR("Unable to read symbolic link [%llx:%x]\n", block,
1279 +                                       offset);
1280 +                       goto skip_read;
1281 +               }
1282 +       }
1283 +
1284 +       if (length != index) {
1285 +               ERROR("(squashfs_symlink_readpage) length != index\n");
1286 +               bytes = 0;
1287 +               goto skip_read;
1288 +       }
1289 +
1290 +       bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
1291 +                                       i_size_read(inode) - length;
1292 +
1293 +       if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
1294 +                                       offset, bytes, &block, &offset)))
1295 +               ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
1296 +
1297 +skip_read:
1298 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1299 +       kunmap(page);
1300 +       SetPageUptodate(page);
1301 +       unlock_page(page);
1302 +
1303 +       return 0;
1304 +}
1305 +
1306 +
1307 +struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
1308 +{
1309 +       struct meta_index *meta = NULL;
1310 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1311 +       int i;
1312 +
1313 +       down(&msblk->meta_index_mutex);
1314 +
1315 +       TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
1316 +
1317 +       if(msblk->meta_index == NULL)
1318 +               goto not_allocated;
1319 +
1320 +       for (i = 0; i < SQUASHFS_META_NUMBER; i ++)
1321 +               if (msblk->meta_index[i].inode_number == inode->i_ino &&
1322 +                               msblk->meta_index[i].offset >= offset &&
1323 +                               msblk->meta_index[i].offset <= index &&
1324 +                               msblk->meta_index[i].locked == 0) {
1325 +                       TRACE("locate_meta_index: entry %d, offset %d\n", i,
1326 +                                       msblk->meta_index[i].offset);
1327 +                       meta = &msblk->meta_index[i];
1328 +                       offset = meta->offset;
1329 +               }
1330 +
1331 +       if (meta)
1332 +               meta->locked = 1;
1333 +
1334 +not_allocated:
1335 +       up(&msblk->meta_index_mutex);
1336 +
1337 +       return meta;
1338 +}
1339 +
1340 +
1341 +struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
1342 +{
1343 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1344 +       struct meta_index *meta = NULL;
1345 +       int i;
1346 +
1347 +       down(&msblk->meta_index_mutex);
1348 +
1349 +       TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
1350 +
1351 +       if(msblk->meta_index == NULL) {
1352 +               if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
1353 +                                       SQUASHFS_META_NUMBER, GFP_KERNEL))) {
1354 +                       ERROR("Failed to allocate meta_index\n");
1355 +                       goto failed;
1356 +               }
1357 +               for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
1358 +                       msblk->meta_index[i].inode_number = 0;
1359 +                       msblk->meta_index[i].locked = 0;
1360 +               }
1361 +               msblk->next_meta_index = 0;
1362 +       }
1363 +
1364 +       for(i = SQUASHFS_META_NUMBER; i &&
1365 +                       msblk->meta_index[msblk->next_meta_index].locked; i --)
1366 +               msblk->next_meta_index = (msblk->next_meta_index + 1) %
1367 +                       SQUASHFS_META_NUMBER;
1368 +
1369 +       if(i == 0) {
1370 +               TRACE("empty_meta_index: failed!\n");
1371 +               goto failed;
1372 +       }
1373 +
1374 +       TRACE("empty_meta_index: returned meta entry %d, %p\n",
1375 +                       msblk->next_meta_index,
1376 +                       &msblk->meta_index[msblk->next_meta_index]);
1377 +
1378 +       meta = &msblk->meta_index[msblk->next_meta_index];
1379 +       msblk->next_meta_index = (msblk->next_meta_index + 1) %
1380 +                       SQUASHFS_META_NUMBER;
1381 +
1382 +       meta->inode_number = inode->i_ino;
1383 +       meta->offset = offset;
1384 +       meta->skip = skip;
1385 +       meta->entries = 0;
1386 +       meta->locked = 1;
1387 +
1388 +failed:
1389 +       up(&msblk->meta_index_mutex);
1390 +       return meta;
1391 +}
1392 +
1393 +
1394 +void release_meta_index(struct inode *inode, struct meta_index *meta)
1395 +{
1396 +       meta->locked = 0;
1397 +}
1398 +
1399 +
1400 +static int read_block_index(struct super_block *s, int blocks, char *block_list,
1401 +               long long *start_block, int *offset)
1402 +{
1403 +       struct squashfs_sb_info *msblk = s->s_fs_info;
1404 +       unsigned int *block_listp;
1405 +       int block = 0;
1406 +
1407 +       if (msblk->swap) {
1408 +               char sblock_list[blocks << 2];
1409 +
1410 +               if (!squashfs_get_cached_block(s, sblock_list, *start_block,
1411 +                               *offset, blocks << 2, start_block, offset)) {
1412 +                       ERROR("Unable to read block list [%llx:%x]\n",
1413 +                               *start_block, *offset);
1414 +                       goto failure;
1415 +               }
1416 +               SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
1417 +                               ((unsigned int *)sblock_list), blocks);
1418 +       } else
1419 +               if (!squashfs_get_cached_block(s, block_list, *start_block,
1420 +                               *offset, blocks << 2, start_block, offset)) {
1421 +                       ERROR("Unable to read block list [%llx:%x]\n",
1422 +                               *start_block, *offset);
1423 +                       goto failure;
1424 +               }
1425 +
1426 +       for (block_listp = (unsigned int *) block_list; blocks;
1427 +                               block_listp++, blocks --)
1428 +               block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
1429 +
1430 +       return block;
1431 +
1432 +failure:
1433 +       return -1;
1434 +}
1435 +
1436 +
1437 +#define SIZE 256
1438 +
1439 +static inline int calculate_skip(int blocks) {
1440 +       int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES);
1441 +       return skip >= 7 ? 7 : skip + 1;
1442 +}
1443 +
1444 +
1445 +static int get_meta_index(struct inode *inode, int index,
1446 +               long long *index_block, int *index_offset,
1447 +               long long *data_block, char *block_list)
1448 +{
1449 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1450 +       struct squashfs_super_block *sblk = &msblk->sblk;
1451 +       int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
1452 +       int offset = 0;
1453 +       struct meta_index *meta;
1454 +       struct meta_entry *meta_entry;
1455 +       long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
1456 +       int cur_offset = SQUASHFS_I(inode)->offset;
1457 +       long long cur_data_block = SQUASHFS_I(inode)->start_block;
1458 +       int i;
1459 +
1460 +       index /= SQUASHFS_META_INDEXES * skip;
1461 +
1462 +       while ( offset < index ) {
1463 +               meta = locate_meta_index(inode, index, offset + 1);
1464 +
1465 +               if (meta == NULL) {
1466 +                       if ((meta = empty_meta_index(inode, offset + 1,
1467 +                                                       skip)) == NULL)
1468 +                               goto all_done;
1469 +               } else {
1470 +                       offset = index < meta->offset + meta->entries ? index :
1471 +                               meta->offset + meta->entries - 1;
1472 +                       meta_entry = &meta->meta_entry[offset - meta->offset];
1473 +                       cur_index_block = meta_entry->index_block + sblk->inode_table_start;
1474 +                       cur_offset = meta_entry->offset;
1475 +                       cur_data_block = meta_entry->data_block;
1476 +                       TRACE("get_meta_index: offset %d, meta->offset %d, "
1477 +                               "meta->entries %d\n", offset, meta->offset,
1478 +                               meta->entries);
1479 +                       TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
1480 +                               " data_block 0x%llx\n", cur_index_block,
1481 +                               cur_offset, cur_data_block);
1482 +               }
1483 +
1484 +               for (i = meta->offset + meta->entries; i <= index &&
1485 +                               i < meta->offset + SQUASHFS_META_ENTRIES; i++) {
1486 +                       int blocks = skip * SQUASHFS_META_INDEXES;
1487 +
1488 +                       while (blocks) {
1489 +                               int block = blocks > (SIZE >> 2) ? (SIZE >> 2) :
1490 +                                       blocks;
1491 +                               int res = read_block_index(inode->i_sb, block,
1492 +                                       block_list, &cur_index_block,
1493 +                                       &cur_offset);
1494 +
1495 +                               if (res == -1)
1496 +                                       goto failed;
1497 +
1498 +                               cur_data_block += res;
1499 +                               blocks -= block;
1500 +                       }
1501 +
1502 +                       meta_entry = &meta->meta_entry[i - meta->offset];
1503 +                       meta_entry->index_block = cur_index_block - sblk->inode_table_start;
1504 +                       meta_entry->offset = cur_offset;
1505 +                       meta_entry->data_block = cur_data_block;
1506 +                       meta->entries ++;
1507 +                       offset ++;
1508 +               }
1509 +
1510 +               TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
1511 +                               meta->offset, meta->entries);
1512 +
1513 +               release_meta_index(inode, meta);
1514 +       }
1515 +
1516 +all_done:
1517 +       *index_block = cur_index_block;
1518 +       *index_offset = cur_offset;
1519 +       *data_block = cur_data_block;
1520 +
1521 +       return offset * SQUASHFS_META_INDEXES * skip;
1522 +
1523 +failed:
1524 +       release_meta_index(inode, meta);
1525 +       return -1;
1526 +}
1527 +
1528 +
1529 +static long long read_blocklist(struct inode *inode, int index,
1530 +                               int readahead_blks, char *block_list,
1531 +                               unsigned short **block_p, unsigned int *bsize)
1532 +{
1533 +       long long block_ptr;
1534 +       int offset;
1535 +       long long block;
1536 +       int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
1537 +               block_list);
1538 +
1539 +       TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
1540 +                      " 0x%x, block 0x%llx\n", res, index, block_ptr, offset,
1541 +                      block);
1542 +
1543 +       if(res == -1)
1544 +               goto failure;
1545 +
1546 +       index -= res;
1547 +
1548 +       while ( index ) {
1549 +               int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
1550 +               int res = read_block_index(inode->i_sb, blocks, block_list,
1551 +                       &block_ptr, &offset);
1552 +               if (res == -1)
1553 +                       goto failure;
1554 +               block += res;
1555 +               index -= blocks;
1556 +       }
1557 +
1558 +       if (read_block_index(inode->i_sb, 1, block_list,
1559 +                       &block_ptr, &offset) == -1)
1560 +               goto failure;
1561 +       *bsize = *((unsigned int *) block_list);
1562 +
1563 +       return block;
1564 +
1565 +failure:
1566 +       return 0;
1567 +}
1568 +
1569 +
1570 +static int squashfs_readpage(struct file *file, struct page *page)
1571 +{
1572 +       struct inode *inode = page->mapping->host;
1573 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1574 +       struct squashfs_super_block *sblk = &msblk->sblk;
1575 +       unsigned char block_list[SIZE];
1576 +       long long block;
1577 +       unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
1578 +       int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
1579 +       void *pageaddr;
1580 +       struct squashfs_fragment_cache *fragment = NULL;
1581 +       char *data_ptr = msblk->read_page;
1582 +
1583 +       int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
1584 +       int start_index = page->index & ~mask;
1585 +       int end_index = start_index | mask;
1586 +
1587 +       TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
1588 +                                       page->index,
1589 +                                       SQUASHFS_I(inode)->start_block);
1590 +
1591 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1592 +                                       PAGE_CACHE_SHIFT))
1593 +               goto skip_read;
1594 +
1595 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1596 +                                       || index < (i_size_read(inode) >>
1597 +                                       sblk->block_log)) {
1598 +               if ((block = (msblk->read_blocklist)(inode, index, 1,
1599 +                                       block_list, NULL, &bsize)) == 0)
1600 +                       goto skip_read;
1601 +
1602 +               down(&msblk->read_page_mutex);
1603 +
1604 +               if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
1605 +                                       block, bsize, NULL))) {
1606 +                       ERROR("Unable to read page, block %llx, size %x\n", block,
1607 +                                       bsize);
1608 +                       up(&msblk->read_page_mutex);
1609 +                       goto skip_read;
1610 +               }
1611 +       } else {
1612 +               if ((fragment = get_cached_fragment(inode->i_sb,
1613 +                                       SQUASHFS_I(inode)->
1614 +                                       u.s1.fragment_start_block,
1615 +                                       SQUASHFS_I(inode)->u.s1.fragment_size))
1616 +                                       == NULL) {
1617 +                       ERROR("Unable to read page, block %llx, size %x\n",
1618 +                                       SQUASHFS_I(inode)->
1619 +                                       u.s1.fragment_start_block,
1620 +                                       (int) SQUASHFS_I(inode)->
1621 +                                       u.s1.fragment_size);
1622 +                       goto skip_read;
1623 +               }
1624 +               bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
1625 +                                       (i_size_read(inode) & (sblk->block_size
1626 +                                       - 1));
1627 +               byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
1628 +               data_ptr = fragment->data;
1629 +       }
1630 +
1631 +       for (i = start_index; i <= end_index && byte_offset < bytes;
1632 +                                       i++, byte_offset += PAGE_CACHE_SIZE) {
1633 +               struct page *push_page;
1634 +               int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ?
1635 +                                       PAGE_CACHE_SIZE : bytes - byte_offset;
1636 +
1637 +               TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n",
1638 +                                       bytes, i, byte_offset, available_bytes);
1639 +
1640 +               if (i == page->index)  {
1641 +                       pageaddr = kmap_atomic(page, KM_USER0);
1642 +                       memcpy(pageaddr, data_ptr + byte_offset,
1643 +                                       available_bytes);
1644 +                       memset(pageaddr + available_bytes, 0,
1645 +                                       PAGE_CACHE_SIZE - available_bytes);
1646 +                       kunmap_atomic(pageaddr, KM_USER0);
1647 +                       flush_dcache_page(page);
1648 +                       SetPageUptodate(page);
1649 +                       unlock_page(page);
1650 +               } else if ((push_page =
1651 +                               grab_cache_page_nowait(page->mapping, i))) {
1652 +                       pageaddr = kmap_atomic(push_page, KM_USER0);
1653 +
1654 +                       memcpy(pageaddr, data_ptr + byte_offset,
1655 +                                       available_bytes);
1656 +                       memset(pageaddr + available_bytes, 0,
1657 +                                       PAGE_CACHE_SIZE - available_bytes);
1658 +                       kunmap_atomic(pageaddr, KM_USER0);
1659 +                       flush_dcache_page(push_page);
1660 +                       SetPageUptodate(push_page);
1661 +                       unlock_page(push_page);
1662 +                       page_cache_release(push_page);
1663 +               }
1664 +       }
1665 +
1666 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1667 +                                       || index < (i_size_read(inode) >>
1668 +                                       sblk->block_log))
1669 +               up(&msblk->read_page_mutex);
1670 +       else
1671 +               release_cached_fragment(msblk, fragment);
1672 +
1673 +       return 0;
1674 +
1675 +skip_read:
1676 +       pageaddr = kmap_atomic(page, KM_USER0);
1677 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1678 +       kunmap_atomic(pageaddr, KM_USER0);
1679 +       flush_dcache_page(page);
1680 +       SetPageUptodate(page);
1681 +       unlock_page(page);
1682 +
1683 +       return 0;
1684 +}
1685 +
1686 +
1687 +static int squashfs_readpage4K(struct file *file, struct page *page)
1688 +{
1689 +       struct inode *inode = page->mapping->host;
1690 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1691 +       struct squashfs_super_block *sblk = &msblk->sblk;
1692 +       unsigned char block_list[SIZE];
1693 +       long long block;
1694 +       unsigned int bsize, bytes = 0;
1695 +       void *pageaddr;
1696 +
1697 +       TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
1698 +                                       page->index,
1699 +                                       SQUASHFS_I(inode)->start_block);
1700 +
1701 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1702 +                                       PAGE_CACHE_SHIFT)) {
1703 +               pageaddr = kmap_atomic(page, KM_USER0);
1704 +               goto skip_read;
1705 +       }
1706 +
1707 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1708 +                                       || page->index < (i_size_read(inode) >>
1709 +                                       sblk->block_log)) {
1710 +               block = (msblk->read_blocklist)(inode, page->index, 1,
1711 +                                       block_list, NULL, &bsize);
1712 +
1713 +               down(&msblk->read_page_mutex);
1714 +               bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
1715 +                                       bsize, NULL);
1716 +               pageaddr = kmap_atomic(page, KM_USER0);
1717 +               if (bytes)
1718 +                       memcpy(pageaddr, msblk->read_page, bytes);
1719 +               else
1720 +                       ERROR("Unable to read page, block %llx, size %x\n",
1721 +                                       block, bsize);
1722 +               up(&msblk->read_page_mutex);
1723 +       } else {
1724 +               struct squashfs_fragment_cache *fragment =
1725 +                       get_cached_fragment(inode->i_sb,
1726 +                                       SQUASHFS_I(inode)->
1727 +                                       u.s1.fragment_start_block,
1728 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1729 +               pageaddr = kmap_atomic(page, KM_USER0);
1730 +               if (fragment) {
1731 +                       bytes = i_size_read(inode) & (sblk->block_size - 1);
1732 +                       memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
1733 +                                       u.s1.fragment_offset, bytes);
1734 +                       release_cached_fragment(msblk, fragment);
1735 +               } else
1736 +                       ERROR("Unable to read page, block %llx, size %x\n",
1737 +                                       SQUASHFS_I(inode)->
1738 +                                       u.s1.fragment_start_block, (int)
1739 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1740 +       }
1741 +
1742 +skip_read:
1743 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1744 +       kunmap_atomic(pageaddr, KM_USER0);
1745 +       flush_dcache_page(page);
1746 +       SetPageUptodate(page);
1747 +       unlock_page(page);
1748 +
1749 +       return 0;
1750 +}
1751 +
1752 +
1753 +static int get_dir_index_using_offset(struct super_block *s, long long
1754 +                               *next_block, unsigned int *next_offset,
1755 +                               long long index_start,
1756 +                               unsigned int index_offset, int i_count,
1757 +                               long long f_pos)
1758 +{
1759 +       struct squashfs_sb_info *msblk = s->s_fs_info;
1760 +       struct squashfs_super_block *sblk = &msblk->sblk;
1761 +       int i, length = 0;
1762 +       struct squashfs_dir_index index;
1763 +
1764 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
1765 +                                       i_count, (unsigned int) f_pos);
1766 +
1767 +       f_pos =- 3;
1768 +       if (f_pos == 0)
1769 +               goto finish;
1770 +
1771 +       for (i = 0; i < i_count; i++) {
1772 +               if (msblk->swap) {
1773 +                       struct squashfs_dir_index sindex;
1774 +                       squashfs_get_cached_block(s, (char *) &sindex,
1775 +                                       index_start, index_offset,
1776 +                                       sizeof(sindex), &index_start,
1777 +                                       &index_offset);
1778 +                       SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
1779 +               } else
1780 +                       squashfs_get_cached_block(s, (char *) &index,
1781 +                                       index_start, index_offset,
1782 +                                       sizeof(index), &index_start,
1783 +                                       &index_offset);
1784 +
1785 +               if (index.index > f_pos)
1786 +                       break;
1787 +
1788 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
1789 +                                       index.size + 1, &index_start,
1790 +                                       &index_offset);
1791 +
1792 +               length = index.index;
1793 +               *next_block = index.start_block + sblk->directory_table_start;
1794 +       }
1795 +
1796 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1797 +
1798 +finish:
1799 +       return length + 3;
1800 +}
1801 +
1802 +
1803 +static int get_dir_index_using_name(struct super_block *s, long long
1804 +                               *next_block, unsigned int *next_offset,
1805 +                               long long index_start,
1806 +                               unsigned int index_offset, int i_count,
1807 +                               const char *name, int size)
1808 +{
1809 +       struct squashfs_sb_info *msblk = s->s_fs_info;
1810 +       struct squashfs_super_block *sblk = &msblk->sblk;
1811 +       int i, length = 0;
1812 +       char buffer[sizeof(struct squashfs_dir_index) + SQUASHFS_NAME_LEN + 1];
1813 +       struct squashfs_dir_index *index = (struct squashfs_dir_index *) buffer;
1814 +       char str[SQUASHFS_NAME_LEN + 1];
1815 +
1816 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
1817 +
1818 +       strncpy(str, name, size);
1819 +       str[size] = '\0';
1820 +
1821 +       for (i = 0; i < i_count; i++) {
1822 +               if (msblk->swap) {
1823 +                       struct squashfs_dir_index sindex;
1824 +                       squashfs_get_cached_block(s, (char *) &sindex,
1825 +                                       index_start, index_offset,
1826 +                                       sizeof(sindex), &index_start,
1827 +                                       &index_offset);
1828 +                       SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
1829 +               } else
1830 +                       squashfs_get_cached_block(s, (char *) index,
1831 +                                       index_start, index_offset,
1832 +                                       sizeof(struct squashfs_dir_index),
1833 +                                       &index_start, &index_offset);
1834 +
1835 +               squashfs_get_cached_block(s, index->name, index_start,
1836 +                                       index_offset, index->size + 1,
1837 +                                       &index_start, &index_offset);
1838 +
1839 +               index->name[index->size + 1] = '\0';
1840 +
1841 +               if (strcmp(index->name, str) > 0)
1842 +                       break;
1843 +
1844 +               length = index->index;
1845 +               *next_block = index->start_block + sblk->directory_table_start;
1846 +       }
1847 +
1848 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1849 +       return length + 3;
1850 +}
1851 +
1852 +
1853 +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
1854 +{
1855 +       struct inode *i = file->f_dentry->d_inode;
1856 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
1857 +       struct squashfs_super_block *sblk = &msblk->sblk;
1858 +       long long next_block = SQUASHFS_I(i)->start_block +
1859 +               sblk->directory_table_start;
1860 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
1861 +               dir_count;
1862 +       struct squashfs_dir_header dirh;
1863 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
1864 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1865 +
1866 +       TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
1867 +
1868 +       while(file->f_pos < 3) {
1869 +               char *name;
1870 +               int size, i_ino;
1871 +
1872 +               if(file->f_pos == 0) {
1873 +                       name = ".";
1874 +                       size = 1;
1875 +                       i_ino = i->i_ino;
1876 +               } else {
1877 +                       name = "..";
1878 +                       size = 2;
1879 +                       i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
1880 +               }
1881 +               TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
1882 +                               (unsigned int) dirent, name, size, (int)
1883 +                               file->f_pos, i_ino,
1884 +                               squashfs_filetype_table[1]);
1885 +
1886 +               if (filldir(dirent, name, size,
1887 +                               file->f_pos, i_ino,
1888 +                               squashfs_filetype_table[1]) < 0) {
1889 +                               TRACE("Filldir returned less than 0\n");
1890 +                               goto finish;
1891 +               }
1892 +               file->f_pos += size;
1893 +               dirs_read++;
1894 +       }
1895 +
1896 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
1897 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
1898 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
1899 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
1900 +                               file->f_pos);
1901 +
1902 +       while (length < i_size_read(i)) {
1903 +               /* read directory header */
1904 +               if (msblk->swap) {
1905 +                       struct squashfs_dir_header sdirh;
1906 +
1907 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
1908 +                                       next_block, next_offset, sizeof(sdirh),
1909 +                                       &next_block, &next_offset))
1910 +                               goto failed_read;
1911 +
1912 +                       length += sizeof(sdirh);
1913 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1914 +               } else {
1915 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
1916 +                                       next_block, next_offset, sizeof(dirh),
1917 +                                       &next_block, &next_offset))
1918 +                               goto failed_read;
1919 +
1920 +                       length += sizeof(dirh);
1921 +               }
1922 +
1923 +               dir_count = dirh.count + 1;
1924 +               while (dir_count--) {
1925 +                       if (msblk->swap) {
1926 +                               struct squashfs_dir_entry sdire;
1927 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1928 +                                               &sdire, next_block, next_offset,
1929 +                                               sizeof(sdire), &next_block,
1930 +                                               &next_offset))
1931 +                                       goto failed_read;
1932 +
1933 +                               length += sizeof(sdire);
1934 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1935 +                       } else {
1936 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1937 +                                               dire, next_block, next_offset,
1938 +                                               sizeof(*dire), &next_block,
1939 +                                               &next_offset))
1940 +                                       goto failed_read;
1941 +
1942 +                               length += sizeof(*dire);
1943 +                       }
1944 +
1945 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
1946 +                                               next_block, next_offset,
1947 +                                               dire->size + 1, &next_block,
1948 +                                               &next_offset))
1949 +                               goto failed_read;
1950 +
1951 +                       length += dire->size + 1;
1952 +
1953 +                       if (file->f_pos >= length)
1954 +                               continue;
1955 +
1956 +                       dire->name[dire->size + 1] = '\0';
1957 +
1958 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
1959 +                                       (unsigned int) dirent, dire->name,
1960 +                                       dire->size + 1, (int) file->f_pos,
1961 +                                       dirh.start_block, dire->offset,
1962 +                                       dirh.inode_number + dire->inode_number,
1963 +                                       squashfs_filetype_table[dire->type]);
1964 +
1965 +                       if (filldir(dirent, dire->name, dire->size + 1,
1966 +                                       file->f_pos,
1967 +                                       dirh.inode_number + dire->inode_number,
1968 +                                       squashfs_filetype_table[dire->type])
1969 +                                       < 0) {
1970 +                               TRACE("Filldir returned less than 0\n");
1971 +                               goto finish;
1972 +                       }
1973 +                       file->f_pos = length;
1974 +                       dirs_read++;
1975 +               }
1976 +       }
1977 +
1978 +finish:
1979 +       return dirs_read;
1980 +
1981 +failed_read:
1982 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
1983 +               next_offset);
1984 +       return 0;
1985 +}
1986 +
1987 +
1988 +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry,
1989 +                               struct nameidata *nd)
1990 +{
1991 +       const unsigned char *name = dentry->d_name.name;
1992 +       int len = dentry->d_name.len;
1993 +       struct inode *inode = NULL;
1994 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
1995 +       struct squashfs_super_block *sblk = &msblk->sblk;
1996 +       long long next_block = SQUASHFS_I(i)->start_block +
1997 +                               sblk->directory_table_start;
1998 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
1999 +                               dir_count;
2000 +       struct squashfs_dir_header dirh;
2001 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN];
2002 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
2003 +
2004 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
2005 +
2006 +       if (len > SQUASHFS_NAME_LEN)
2007 +               goto exit_loop;
2008 +
2009 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
2010 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2011 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2012 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
2013 +                               len);
2014 +
2015 +       while (length < i_size_read(i)) {
2016 +               /* read directory header */
2017 +               if (msblk->swap) {
2018 +                       struct squashfs_dir_header sdirh;
2019 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2020 +                                       next_block, next_offset, sizeof(sdirh),
2021 +                                       &next_block, &next_offset))
2022 +                               goto failed_read;
2023 +
2024 +                       length += sizeof(sdirh);
2025 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
2026 +               } else {
2027 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2028 +                                       next_block, next_offset, sizeof(dirh),
2029 +                                       &next_block, &next_offset))
2030 +                               goto failed_read;
2031 +
2032 +                       length += sizeof(dirh);
2033 +               }
2034 +
2035 +               dir_count = dirh.count + 1;
2036 +               while (dir_count--) {
2037 +                       if (msblk->swap) {
2038 +                               struct squashfs_dir_entry sdire;
2039 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2040 +                                               &sdire, next_block,next_offset,
2041 +                                               sizeof(sdire), &next_block,
2042 +                                               &next_offset))
2043 +                                       goto failed_read;
2044 +
2045 +                               length += sizeof(sdire);
2046 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
2047 +                       } else {
2048 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2049 +                                               dire, next_block,next_offset,
2050 +                                               sizeof(*dire), &next_block,
2051 +                                               &next_offset))
2052 +                                       goto failed_read;
2053 +
2054 +                               length += sizeof(*dire);
2055 +                       }
2056 +
2057 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2058 +                                       next_block, next_offset, dire->size + 1,
2059 +                                       &next_block, &next_offset))
2060 +                               goto failed_read;
2061 +
2062 +                       length += dire->size + 1;
2063 +
2064 +                       if (name[0] < dire->name[0])
2065 +                               goto exit_loop;
2066 +
2067 +                       if ((len == dire->size + 1) && !strncmp(name,
2068 +                                               dire->name, len)) {
2069 +                               squashfs_inode_t ino =
2070 +                                       SQUASHFS_MKINODE(dirh.start_block,
2071 +                                       dire->offset);
2072 +
2073 +                               TRACE("calling squashfs_iget for directory "
2074 +                                       "entry %s, inode %x:%x, %d\n", name,
2075 +                                       dirh.start_block, dire->offset,
2076 +                                       dirh.inode_number + dire->inode_number);
2077 +
2078 +                               inode = (msblk->iget)(i->i_sb, ino);
2079 +
2080 +                               goto exit_loop;
2081 +                       }
2082 +               }
2083 +       }
2084 +
2085 +exit_loop:
2086 +       d_add(dentry, inode);
2087 +       return ERR_PTR(0);
2088 +
2089 +failed_read:
2090 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2091 +               next_offset);
2092 +       goto exit_loop;
2093 +}
2094 +
2095 +
2096 +static void squashfs_put_super(struct super_block *s)
2097 +{
2098 +       int i;
2099 +
2100 +       if (s->s_fs_info) {
2101 +               struct squashfs_sb_info *sbi = s->s_fs_info;
2102 +               if (sbi->block_cache)
2103 +                       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
2104 +                               if (sbi->block_cache[i].block !=
2105 +                                                       SQUASHFS_INVALID_BLK)
2106 +                                       kfree(sbi->block_cache[i].data);
2107 +               if (sbi->fragment)
2108 +                       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++)
2109 +                               SQUASHFS_FREE(sbi->fragment[i].data);
2110 +               kfree(sbi->fragment);
2111 +               kfree(sbi->block_cache);
2112 +               kfree(sbi->read_data);
2113 +               kfree(sbi->read_page);
2114 +               kfree(sbi->uid);
2115 +               kfree(sbi->fragment_index);
2116 +               kfree(sbi->fragment_index_2);
2117 +               kfree(sbi->meta_index);
2118 +               kfree(s->s_fs_info);
2119 +               s->s_fs_info = NULL;
2120 +       }
2121 +}
2122 +
2123 +
2124 +static int squashfs_get_sb(struct file_system_type *fs_type,
2125 +                       int flags, const char *dev_name, void *data,
2126 +                       struct vfsmount *mnt)
2127 +{
2128 +       return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super, mnt);
2129 +}
2130 +
2131 +
2132 +static int __init init_squashfs_fs(void)
2133 +{
2134 +       int err = init_inodecache();
2135 +       if (err)
2136 +               goto out;
2137 +
2138 +       printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
2139 +               "Phillip Lougher\n");
2140 +
2141 +       if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
2142 +               ERROR("Failed to allocate zlib workspace\n");
2143 +               destroy_inodecache();
2144 +               err = -ENOMEM;
2145 +               goto out;
2146 +       }
2147 +
2148 +       if ((err = register_filesystem(&squashfs_fs_type))) {
2149 +               vfree(stream.workspace);
2150 +               destroy_inodecache();
2151 +       }
2152 +
2153 +out:
2154 +       return err;
2155 +}
2156 +
2157 +
2158 +static void __exit exit_squashfs_fs(void)
2159 +{
2160 +       vfree(stream.workspace);
2161 +       unregister_filesystem(&squashfs_fs_type);
2162 +       destroy_inodecache();
2163 +}
2164 +
2165 +
2166 +static struct kmem_cache * squashfs_inode_cachep;
2167 +
2168 +
2169 +static struct inode *squashfs_alloc_inode(struct super_block *sb)
2170 +{
2171 +       struct squashfs_inode_info *ei;
2172 +       ei = kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL);
2173 +       if (!ei)
2174 +               return NULL;
2175 +       return &ei->vfs_inode;
2176 +}
2177 +
2178 +
2179 +static void squashfs_destroy_inode(struct inode *inode)
2180 +{
2181 +       kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode));
2182 +}
2183 +
2184 +
2185 +static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
2186 +{
2187 +       struct squashfs_inode_info *ei = foo;
2188 +
2189 +       if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2190 +                                                       SLAB_CTOR_CONSTRUCTOR)
2191 +               inode_init_once(&ei->vfs_inode);
2192 +}
2193 +
2194 +
2195 +static int __init init_inodecache(void)
2196 +{
2197 +       squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
2198 +            sizeof(struct squashfs_inode_info),
2199 +            0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
2200 +            init_once, NULL);
2201 +       if (squashfs_inode_cachep == NULL)
2202 +               return -ENOMEM;
2203 +       return 0;
2204 +}
2205 +
2206 +
2207 +static void destroy_inodecache(void)
2208 +{
2209 +       kmem_cache_destroy(squashfs_inode_cachep);
2210 +}
2211 +
2212 +
2213 +module_init(init_squashfs_fs);
2214 +module_exit(exit_squashfs_fs);
2215 +MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
2216 +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
2217 +MODULE_LICENSE("GPL");
2218 Index: linux-2.6.21.7/fs/squashfs/Makefile
2219 ===================================================================
2220 --- /dev/null
2221 +++ linux-2.6.21.7/fs/squashfs/Makefile
2222 @@ -0,0 +1,7 @@
2223 +#
2224 +# Makefile for the linux squashfs routines.
2225 +#
2226 +
2227 +obj-$(CONFIG_SQUASHFS) += squashfs.o
2228 +squashfs-y += inode.o
2229 +squashfs-y += squashfs2_0.o
2230 Index: linux-2.6.21.7/fs/squashfs/squashfs2_0.c
2231 ===================================================================
2232 --- /dev/null
2233 +++ linux-2.6.21.7/fs/squashfs/squashfs2_0.c
2234 @@ -0,0 +1,758 @@
2235 +/*
2236 + * Squashfs - a compressed read only filesystem for Linux
2237 + *
2238 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2239 + * Phillip Lougher <phillip@lougher.org.uk>
2240 + *
2241 + * This program is free software; you can redistribute it and/or
2242 + * modify it under the terms of the GNU General Public License
2243 + * as published by the Free Software Foundation; either version 2,
2244 + * or (at your option) any later version.
2245 + *
2246 + * This program is distributed in the hope that it will be useful,
2247 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2248 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2249 + * GNU General Public License for more details.
2250 + *
2251 + * You should have received a copy of the GNU General Public License
2252 + * along with this program; if not, write to the Free Software
2253 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2254 + *
2255 + * squashfs2_0.c
2256 + */
2257 +
2258 +#include <linux/types.h>
2259 +#include <linux/squashfs_fs.h>
2260 +#include <linux/module.h>
2261 +#include <linux/errno.h>
2262 +#include <linux/slab.h>
2263 +#include <linux/fs.h>
2264 +#include <linux/smp_lock.h>
2265 +#include <linux/slab.h>
2266 +#include <linux/squashfs_fs_sb.h>
2267 +#include <linux/squashfs_fs_i.h>
2268 +#include <linux/buffer_head.h>
2269 +#include <linux/vfs.h>
2270 +#include <linux/init.h>
2271 +#include <linux/dcache.h>
2272 +#include <linux/wait.h>
2273 +#include <linux/zlib.h>
2274 +#include <linux/blkdev.h>
2275 +#include <linux/vmalloc.h>
2276 +#include <asm/uaccess.h>
2277 +#include <asm/semaphore.h>
2278 +
2279 +#include "squashfs.h"
2280 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
2281 +static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *,
2282 +                               struct nameidata *);
2283 +
2284 +static struct file_operations squashfs_dir_ops_2 = {
2285 +       .read = generic_read_dir,
2286 +       .readdir = squashfs_readdir_2
2287 +};
2288 +
2289 +static struct inode_operations squashfs_dir_inode_ops_2 = {
2290 +       .lookup = squashfs_lookup_2
2291 +};
2292 +
2293 +static unsigned char squashfs_filetype_table[] = {
2294 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
2295 +};
2296 +
2297 +static int read_fragment_index_table_2(struct super_block *s)
2298 +{
2299 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2300 +       struct squashfs_super_block *sblk = &msblk->sblk;
2301 +
2302 +       if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
2303 +                                       (sblk->fragments), GFP_KERNEL))) {
2304 +               ERROR("Failed to allocate uid/gid table\n");
2305 +               return 0;
2306 +       }
2307 +
2308 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
2309 +                                       !squashfs_read_data(s, (char *)
2310 +                                       msblk->fragment_index_2,
2311 +                                       sblk->fragment_table_start,
2312 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES_2
2313 +                                       (sblk->fragments) |
2314 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
2315 +               ERROR("unable to read fragment index table\n");
2316 +               return 0;
2317 +       }
2318 +
2319 +       if (msblk->swap) {
2320 +               int i;
2321 +               unsigned int fragment;
2322 +
2323 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
2324 +                                                                       i++) {
2325 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
2326 +                                               &msblk->fragment_index_2[i], 1);
2327 +                       msblk->fragment_index_2[i] = fragment;
2328 +               }
2329 +       }
2330 +
2331 +       return 1;
2332 +}
2333 +
2334 +
2335 +static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
2336 +                               long long *fragment_start_block,
2337 +                               unsigned int *fragment_size)
2338 +{
2339 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2340 +       long long start_block =
2341 +               msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
2342 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
2343 +       struct squashfs_fragment_entry_2 fragment_entry;
2344 +
2345 +       if (msblk->swap) {
2346 +               struct squashfs_fragment_entry_2 sfragment_entry;
2347 +
2348 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
2349 +                                       start_block, offset,
2350 +                                       sizeof(sfragment_entry), &start_block,
2351 +                                       &offset))
2352 +                       goto out;
2353 +               SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
2354 +       } else
2355 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
2356 +                                       start_block, offset,
2357 +                                       sizeof(fragment_entry), &start_block,
2358 +                                       &offset))
2359 +                       goto out;
2360 +
2361 +       *fragment_start_block = fragment_entry.start_block;
2362 +       *fragment_size = fragment_entry.size;
2363 +
2364 +       return 1;
2365 +
2366 +out:
2367 +       return 0;
2368 +}
2369 +
2370 +
2371 +static struct inode *squashfs_new_inode(struct super_block *s,
2372 +               struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
2373 +{
2374 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2375 +       struct squashfs_super_block *sblk = &msblk->sblk;
2376 +       struct inode *i = new_inode(s);
2377 +
2378 +       if (i) {
2379 +               i->i_ino = ino;
2380 +               i->i_mtime.tv_sec = sblk->mkfs_time;
2381 +               i->i_atime.tv_sec = sblk->mkfs_time;
2382 +               i->i_ctime.tv_sec = sblk->mkfs_time;
2383 +               i->i_uid = msblk->uid[inodeb->uid];
2384 +               i->i_mode = inodeb->mode;
2385 +               i->i_nlink = 1;
2386 +               i->i_size = 0;
2387 +               if (inodeb->guid == SQUASHFS_GUIDS)
2388 +                       i->i_gid = i->i_uid;
2389 +               else
2390 +                       i->i_gid = msblk->guid[inodeb->guid];
2391 +       }
2392 +
2393 +       return i;
2394 +}
2395 +
2396 +
2397 +static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
2398 +{
2399 +       struct inode *i;
2400 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2401 +       struct squashfs_super_block *sblk = &msblk->sblk;
2402 +       unsigned int block = SQUASHFS_INODE_BLK(inode) +
2403 +               sblk->inode_table_start;
2404 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
2405 +       unsigned int ino = SQUASHFS_MK_VFS_INODE(block
2406 +               - sblk->inode_table_start, offset);
2407 +       long long next_block;
2408 +       unsigned int next_offset;
2409 +       union squashfs_inode_header_2 id, sid;
2410 +       struct squashfs_base_inode_header_2 *inodeb = &id.base,
2411 +                                         *sinodeb = &sid.base;
2412 +
2413 +       TRACE("Entered squashfs_iget\n");
2414 +
2415 +       if (msblk->swap) {
2416 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
2417 +                                       offset, sizeof(*sinodeb), &next_block,
2418 +                                       &next_offset))
2419 +                       goto failed_read;
2420 +               SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
2421 +                                       sizeof(*sinodeb));
2422 +       } else
2423 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
2424 +                                       offset, sizeof(*inodeb), &next_block,
2425 +                                       &next_offset))
2426 +                       goto failed_read;
2427 +
2428 +       switch(inodeb->inode_type) {
2429 +               case SQUASHFS_FILE_TYPE: {
2430 +                       struct squashfs_reg_inode_header_2 *inodep = &id.reg;
2431 +                       struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
2432 +                       long long frag_blk;
2433 +                       unsigned int frag_size;
2434 +
2435 +                       if (msblk->swap) {
2436 +                               if (!squashfs_get_cached_block(s, (char *)
2437 +                                               sinodep, block, offset,
2438 +                                               sizeof(*sinodep), &next_block,
2439 +                                               &next_offset))
2440 +                                       goto failed_read;
2441 +                               SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
2442 +                       } else
2443 +                               if (!squashfs_get_cached_block(s, (char *)
2444 +                                               inodep, block, offset,
2445 +                                               sizeof(*inodep), &next_block,
2446 +                                               &next_offset))
2447 +                                       goto failed_read;
2448 +
2449 +                       frag_blk = SQUASHFS_INVALID_BLK;
2450 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
2451 +                                       !get_fragment_location_2(s,
2452 +                                       inodep->fragment, &frag_blk, &frag_size))
2453 +                               goto failed_read;
2454 +
2455 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2456 +                               goto failed_read1;
2457 +
2458 +                       i->i_size = inodep->file_size;
2459 +                       i->i_fop = &generic_ro_fops;
2460 +                       i->i_mode |= S_IFREG;
2461 +                       i->i_mtime.tv_sec = inodep->mtime;
2462 +                       i->i_atime.tv_sec = inodep->mtime;
2463 +                       i->i_ctime.tv_sec = inodep->mtime;
2464 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
2465 +                       i->i_blksize = PAGE_CACHE_SIZE;
2466 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
2467 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
2468 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
2469 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2470 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
2471 +                       SQUASHFS_I(i)->offset = next_offset;
2472 +                       if (sblk->block_size > 4096)
2473 +                               i->i_data.a_ops = &squashfs_aops;
2474 +                       else
2475 +                               i->i_data.a_ops = &squashfs_aops_4K;
2476 +
2477 +                       TRACE("File inode %x:%x, start_block %x, "
2478 +                                       "block_list_start %llx, offset %x\n",
2479 +                                       SQUASHFS_INODE_BLK(inode), offset,
2480 +                                       inodep->start_block, next_block,
2481 +                                       next_offset);
2482 +                       break;
2483 +               }
2484 +               case SQUASHFS_DIR_TYPE: {
2485 +                       struct squashfs_dir_inode_header_2 *inodep = &id.dir;
2486 +                       struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
2487 +
2488 +                       if (msblk->swap) {
2489 +                               if (!squashfs_get_cached_block(s, (char *)
2490 +                                               sinodep, block, offset,
2491 +                                               sizeof(*sinodep), &next_block,
2492 +                                               &next_offset))
2493 +                                       goto failed_read;
2494 +                               SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
2495 +                       } else
2496 +                               if (!squashfs_get_cached_block(s, (char *)
2497 +                                               inodep, block, offset,
2498 +                                               sizeof(*inodep), &next_block,
2499 +                                               &next_offset))
2500 +                                       goto failed_read;
2501 +
2502 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2503 +                               goto failed_read1;
2504 +
2505 +                       i->i_size = inodep->file_size;
2506 +                       i->i_op = &squashfs_dir_inode_ops_2;
2507 +                       i->i_fop = &squashfs_dir_ops_2;
2508 +                       i->i_mode |= S_IFDIR;
2509 +                       i->i_mtime.tv_sec = inodep->mtime;
2510 +                       i->i_atime.tv_sec = inodep->mtime;
2511 +                       i->i_ctime.tv_sec = inodep->mtime;
2512 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2513 +                       SQUASHFS_I(i)->offset = inodep->offset;
2514 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
2515 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2516 +
2517 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
2518 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
2519 +                                       offset, inodep->start_block,
2520 +                                       inodep->offset);
2521 +                       break;
2522 +               }
2523 +               case SQUASHFS_LDIR_TYPE: {
2524 +                       struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
2525 +                       struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
2526 +
2527 +                       if (msblk->swap) {
2528 +                               if (!squashfs_get_cached_block(s, (char *)
2529 +                                               sinodep, block, offset,
2530 +                                               sizeof(*sinodep), &next_block,
2531 +                                               &next_offset))
2532 +                                       goto failed_read;
2533 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
2534 +                                               sinodep);
2535 +                       } else
2536 +                               if (!squashfs_get_cached_block(s, (char *)
2537 +                                               inodep, block, offset,
2538 +                                               sizeof(*inodep), &next_block,
2539 +                                               &next_offset))
2540 +                                       goto failed_read;
2541 +
2542 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2543 +                               goto failed_read1;
2544 +
2545 +                       i->i_size = inodep->file_size;
2546 +                       i->i_op = &squashfs_dir_inode_ops_2;
2547 +                       i->i_fop = &squashfs_dir_ops_2;
2548 +                       i->i_mode |= S_IFDIR;
2549 +                       i->i_mtime.tv_sec = inodep->mtime;
2550 +                       i->i_atime.tv_sec = inodep->mtime;
2551 +                       i->i_ctime.tv_sec = inodep->mtime;
2552 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2553 +                       SQUASHFS_I(i)->offset = inodep->offset;
2554 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
2555 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
2556 +                                                               next_offset;
2557 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
2558 +                                                               inodep->i_count;
2559 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2560 +
2561 +                       TRACE("Long directory inode %x:%x, start_block %x, "
2562 +                                       "offset %x\n",
2563 +                                       SQUASHFS_INODE_BLK(inode), offset,
2564 +                                       inodep->start_block, inodep->offset);
2565 +                       break;
2566 +               }
2567 +               case SQUASHFS_SYMLINK_TYPE: {
2568 +                       struct squashfs_symlink_inode_header_2 *inodep =
2569 +                                                               &id.symlink;
2570 +                       struct squashfs_symlink_inode_header_2 *sinodep =
2571 +                                                               &sid.symlink;
2572 +
2573 +                       if (msblk->swap) {
2574 +                               if (!squashfs_get_cached_block(s, (char *)
2575 +                                               sinodep, block, offset,
2576 +                                               sizeof(*sinodep), &next_block,
2577 +                                               &next_offset))
2578 +                                       goto failed_read;
2579 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
2580 +                                                               sinodep);
2581 +                       } else
2582 +                               if (!squashfs_get_cached_block(s, (char *)
2583 +                                               inodep, block, offset,
2584 +                                               sizeof(*inodep), &next_block,
2585 +                                               &next_offset))
2586 +                                       goto failed_read;
2587 +
2588 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2589 +                               goto failed_read1;
2590 +
2591 +                       i->i_size = inodep->symlink_size;
2592 +                       i->i_op = &page_symlink_inode_operations;
2593 +                       i->i_data.a_ops = &squashfs_symlink_aops;
2594 +                       i->i_mode |= S_IFLNK;
2595 +                       SQUASHFS_I(i)->start_block = next_block;
2596 +                       SQUASHFS_I(i)->offset = next_offset;
2597 +
2598 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
2599 +                                       "offset %x\n",
2600 +                                       SQUASHFS_INODE_BLK(inode), offset,
2601 +                                       next_block, next_offset);
2602 +                       break;
2603 +                }
2604 +                case SQUASHFS_BLKDEV_TYPE:
2605 +                case SQUASHFS_CHRDEV_TYPE: {
2606 +                       struct squashfs_dev_inode_header_2 *inodep = &id.dev;
2607 +                       struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
2608 +
2609 +                       if (msblk->swap) {
2610 +                               if (!squashfs_get_cached_block(s, (char *)
2611 +                                               sinodep, block, offset,
2612 +                                               sizeof(*sinodep), &next_block,
2613 +                                               &next_offset))
2614 +                                       goto failed_read;
2615 +                               SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
2616 +                       } else
2617 +                               if (!squashfs_get_cached_block(s, (char *)
2618 +                                               inodep, block, offset,
2619 +                                               sizeof(*inodep), &next_block,
2620 +                                               &next_offset))
2621 +                                       goto failed_read;
2622 +
2623 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2624 +                               goto failed_read1;
2625 +
2626 +                       i->i_mode |= (inodeb->inode_type ==
2627 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
2628 +                                       S_IFBLK;
2629 +                       init_special_inode(i, i->i_mode,
2630 +                                       old_decode_dev(inodep->rdev));
2631 +
2632 +                       TRACE("Device inode %x:%x, rdev %x\n",
2633 +                                       SQUASHFS_INODE_BLK(inode), offset,
2634 +                                       inodep->rdev);
2635 +                       break;
2636 +                }
2637 +                case SQUASHFS_FIFO_TYPE:
2638 +                case SQUASHFS_SOCKET_TYPE: {
2639 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2640 +                               goto failed_read1;
2641 +
2642 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
2643 +                                                       ? S_IFIFO : S_IFSOCK;
2644 +                       init_special_inode(i, i->i_mode, 0);
2645 +                       break;
2646 +                }
2647 +                default:
2648 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
2649 +                                       inodeb->inode_type);
2650 +                       goto failed_read1;
2651 +       }
2652 +
2653 +       insert_inode_hash(i);
2654 +       return i;
2655 +
2656 +failed_read:
2657 +       ERROR("Unable to read inode [%x:%x]\n", block, offset);
2658 +
2659 +failed_read1:
2660 +       return NULL;
2661 +}
2662 +
2663 +
2664 +static int get_dir_index_using_offset(struct super_block *s, long long
2665 +                               *next_block, unsigned int *next_offset,
2666 +                               long long index_start,
2667 +                               unsigned int index_offset, int i_count,
2668 +                               long long f_pos)
2669 +{
2670 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2671 +       struct squashfs_super_block *sblk = &msblk->sblk;
2672 +       int i, length = 0;
2673 +       struct squashfs_dir_index_2 index;
2674 +
2675 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
2676 +                                       i_count, (unsigned int) f_pos);
2677 +
2678 +       if (f_pos == 0)
2679 +               goto finish;
2680 +
2681 +       for (i = 0; i < i_count; i++) {
2682 +               if (msblk->swap) {
2683 +                       struct squashfs_dir_index_2 sindex;
2684 +                       squashfs_get_cached_block(s, (char *) &sindex,
2685 +                                       index_start, index_offset,
2686 +                                       sizeof(sindex), &index_start,
2687 +                                       &index_offset);
2688 +                       SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
2689 +               } else
2690 +                       squashfs_get_cached_block(s, (char *) &index,
2691 +                                       index_start, index_offset,
2692 +                                       sizeof(index), &index_start,
2693 +                                       &index_offset);
2694 +
2695 +               if (index.index > f_pos)
2696 +                       break;
2697 +
2698 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
2699 +                                       index.size + 1, &index_start,
2700 +                                       &index_offset);
2701 +
2702 +               length = index.index;
2703 +               *next_block = index.start_block + sblk->directory_table_start;
2704 +       }
2705 +
2706 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2707 +
2708 +finish:
2709 +       return length;
2710 +}
2711 +
2712 +
2713 +static int get_dir_index_using_name(struct super_block *s, long long
2714 +                               *next_block, unsigned int *next_offset,
2715 +                               long long index_start,
2716 +                               unsigned int index_offset, int i_count,
2717 +                               const char *name, int size)
2718 +{
2719 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2720 +       struct squashfs_super_block *sblk = &msblk->sblk;
2721 +       int i, length = 0;
2722 +       char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1];
2723 +       struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer;
2724 +       char str[SQUASHFS_NAME_LEN + 1];
2725 +
2726 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
2727 +
2728 +       strncpy(str, name, size);
2729 +       str[size] = '\0';
2730 +
2731 +       for (i = 0; i < i_count; i++) {
2732 +               if (msblk->swap) {
2733 +                       struct squashfs_dir_index_2 sindex;
2734 +                       squashfs_get_cached_block(s, (char *) &sindex,
2735 +                                       index_start, index_offset,
2736 +                                       sizeof(sindex), &index_start,
2737 +                                       &index_offset);
2738 +                       SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
2739 +               } else
2740 +                       squashfs_get_cached_block(s, (char *) index,
2741 +                                       index_start, index_offset,
2742 +                                       sizeof(struct squashfs_dir_index_2),
2743 +                                       &index_start, &index_offset);
2744 +
2745 +               squashfs_get_cached_block(s, index->name, index_start,
2746 +                                       index_offset, index->size + 1,
2747 +                                       &index_start, &index_offset);
2748 +
2749 +               index->name[index->size + 1] = '\0';
2750 +
2751 +               if (strcmp(index->name, str) > 0)
2752 +                       break;
2753 +
2754 +               length = index->index;
2755 +               *next_block = index->start_block + sblk->directory_table_start;
2756 +       }
2757 +
2758 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2759 +       return length;
2760 +}
2761 +
2762 +
2763 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
2764 +{
2765 +       struct inode *i = file->f_dentry->d_inode;
2766 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
2767 +       struct squashfs_super_block *sblk = &msblk->sblk;
2768 +       long long next_block = SQUASHFS_I(i)->start_block +
2769 +               sblk->directory_table_start;
2770 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
2771 +               dir_count;
2772 +       struct squashfs_dir_header_2 dirh;
2773 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1];
2774 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2775 +
2776 +       TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
2777 +
2778 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
2779 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2780 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2781 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
2782 +                               file->f_pos);
2783 +
2784 +       while (length < i_size_read(i)) {
2785 +               /* read directory header */
2786 +               if (msblk->swap) {
2787 +                       struct squashfs_dir_header_2 sdirh;
2788 +
2789 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2790 +                                       next_block, next_offset, sizeof(sdirh),
2791 +                                       &next_block, &next_offset))
2792 +                               goto failed_read;
2793 +
2794 +                       length += sizeof(sdirh);
2795 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2796 +               } else {
2797 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2798 +                                       next_block, next_offset, sizeof(dirh),
2799 +                                       &next_block, &next_offset))
2800 +                               goto failed_read;
2801 +
2802 +                       length += sizeof(dirh);
2803 +               }
2804 +
2805 +               dir_count = dirh.count + 1;
2806 +               while (dir_count--) {
2807 +                       if (msblk->swap) {
2808 +                               struct squashfs_dir_entry_2 sdire;
2809 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2810 +                                               &sdire, next_block, next_offset,
2811 +                                               sizeof(sdire), &next_block,
2812 +                                               &next_offset))
2813 +                                       goto failed_read;
2814 +
2815 +                               length += sizeof(sdire);
2816 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2817 +                       } else {
2818 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2819 +                                               dire, next_block, next_offset,
2820 +                                               sizeof(*dire), &next_block,
2821 +                                               &next_offset))
2822 +                                       goto failed_read;
2823 +
2824 +                               length += sizeof(*dire);
2825 +                       }
2826 +
2827 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2828 +                                               next_block, next_offset,
2829 +                                               dire->size + 1, &next_block,
2830 +                                               &next_offset))
2831 +                               goto failed_read;
2832 +
2833 +                       length += dire->size + 1;
2834 +
2835 +                       if (file->f_pos >= length)
2836 +                               continue;
2837 +
2838 +                       dire->name[dire->size + 1] = '\0';
2839 +
2840 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
2841 +                                       (unsigned int) dirent, dire->name,
2842 +                                       dire->size + 1, (int) file->f_pos,
2843 +                                       dirh.start_block, dire->offset,
2844 +                                       squashfs_filetype_table[dire->type]);
2845 +
2846 +                       if (filldir(dirent, dire->name, dire->size + 1,
2847 +                                       file->f_pos, SQUASHFS_MK_VFS_INODE(
2848 +                                       dirh.start_block, dire->offset),
2849 +                                       squashfs_filetype_table[dire->type])
2850 +                                       < 0) {
2851 +                               TRACE("Filldir returned less than 0\n");
2852 +                               goto finish;
2853 +                       }
2854 +                       file->f_pos = length;
2855 +                       dirs_read++;
2856 +               }
2857 +       }
2858 +
2859 +finish:
2860 +       return dirs_read;
2861 +
2862 +failed_read:
2863 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2864 +               next_offset);
2865 +       return 0;
2866 +}
2867 +
2868 +
2869 +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry,
2870 +                               struct nameidata *nd)
2871 +{
2872 +       const unsigned char *name = dentry->d_name.name;
2873 +       int len = dentry->d_name.len;
2874 +       struct inode *inode = NULL;
2875 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
2876 +       struct squashfs_super_block *sblk = &msblk->sblk;
2877 +       long long next_block = SQUASHFS_I(i)->start_block +
2878 +                               sblk->directory_table_start;
2879 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
2880 +                               dir_count;
2881 +       struct squashfs_dir_header_2 dirh;
2882 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN];
2883 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2884 +       int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
2885 +
2886 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
2887 +
2888 +       if (len > SQUASHFS_NAME_LEN)
2889 +               goto exit_loop;
2890 +
2891 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
2892 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2893 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2894 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
2895 +                               len);
2896 +
2897 +       while (length < i_size_read(i)) {
2898 +               /* read directory header */
2899 +               if (msblk->swap) {
2900 +                       struct squashfs_dir_header_2 sdirh;
2901 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2902 +                                       next_block, next_offset, sizeof(sdirh),
2903 +                                       &next_block, &next_offset))
2904 +                               goto failed_read;
2905 +
2906 +                       length += sizeof(sdirh);
2907 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2908 +               } else {
2909 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2910 +                                       next_block, next_offset, sizeof(dirh),
2911 +                                       &next_block, &next_offset))
2912 +                               goto failed_read;
2913 +
2914 +                       length += sizeof(dirh);
2915 +               }
2916 +
2917 +               dir_count = dirh.count + 1;
2918 +               while (dir_count--) {
2919 +                       if (msblk->swap) {
2920 +                               struct squashfs_dir_entry_2 sdire;
2921 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2922 +                                               &sdire, next_block,next_offset,
2923 +                                               sizeof(sdire), &next_block,
2924 +                                               &next_offset))
2925 +                                       goto failed_read;
2926 +
2927 +                               length += sizeof(sdire);
2928 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2929 +                       } else {
2930 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2931 +                                               dire, next_block,next_offset,
2932 +                                               sizeof(*dire), &next_block,
2933 +                                               &next_offset))
2934 +                                       goto failed_read;
2935 +
2936 +                               length += sizeof(*dire);
2937 +                       }
2938 +
2939 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2940 +                                       next_block, next_offset, dire->size + 1,
2941 +                                       &next_block, &next_offset))
2942 +                               goto failed_read;
2943 +
2944 +                       length += dire->size + 1;
2945 +
2946 +                       if (sorted && name[0] < dire->name[0])
2947 +                               goto exit_loop;
2948 +
2949 +                       if ((len == dire->size + 1) && !strncmp(name,
2950 +                                               dire->name, len)) {
2951 +                               squashfs_inode_t ino =
2952 +                                       SQUASHFS_MKINODE(dirh.start_block,
2953 +                                       dire->offset);
2954 +
2955 +                               TRACE("calling squashfs_iget for directory "
2956 +                                       "entry %s, inode %x:%x, %lld\n", name,
2957 +                                       dirh.start_block, dire->offset, ino);
2958 +
2959 +                               inode = (msblk->iget)(i->i_sb, ino);
2960 +
2961 +                               goto exit_loop;
2962 +                       }
2963 +               }
2964 +       }
2965 +
2966 +exit_loop:
2967 +       d_add(dentry, inode);
2968 +       return ERR_PTR(0);
2969 +
2970 +failed_read:
2971 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2972 +               next_offset);
2973 +       goto exit_loop;
2974 +}
2975 +
2976 +
2977 +int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
2978 +{
2979 +       struct squashfs_super_block *sblk = &msblk->sblk;
2980 +
2981 +       msblk->iget = squashfs_iget_2;
2982 +       msblk->read_fragment_index_table = read_fragment_index_table_2;
2983 +
2984 +       sblk->bytes_used = sblk->bytes_used_2;
2985 +       sblk->uid_start = sblk->uid_start_2;
2986 +       sblk->guid_start = sblk->guid_start_2;
2987 +       sblk->inode_table_start = sblk->inode_table_start_2;
2988 +       sblk->directory_table_start = sblk->directory_table_start_2;
2989 +       sblk->fragment_table_start = sblk->fragment_table_start_2;
2990 +
2991 +       return 1;
2992 +}
2993 Index: linux-2.6.21.7/fs/squashfs/squashfs.h
2994 ===================================================================
2995 --- /dev/null
2996 +++ linux-2.6.21.7/fs/squashfs/squashfs.h
2997 @@ -0,0 +1,86 @@
2998 +/*
2999 + * Squashfs - a compressed read only filesystem for Linux
3000 + *
3001 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3002 + * Phillip Lougher <phillip@lougher.org.uk>
3003 + *
3004 + * This program is free software; you can redistribute it and/or
3005 + * modify it under the terms of the GNU General Public License
3006 + * as published by the Free Software Foundation; either version 2,
3007 + * or (at your option) any later version.
3008 + *
3009 + * This program is distributed in the hope that it will be useful,
3010 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3011 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3012 + * GNU General Public License for more details.
3013 + *
3014 + * You should have received a copy of the GNU General Public License
3015 + * along with this program; if not, write to the Free Software
3016 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3017 + *
3018 + * squashfs.h
3019 + */
3020 +
3021 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3022 +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3023 +#endif
3024 +
3025 +#ifdef SQUASHFS_TRACE
3026 +#define TRACE(s, args...)      printk(KERN_NOTICE "SQUASHFS: "s, ## args)
3027 +#else
3028 +#define TRACE(s, args...)      {}
3029 +#endif
3030 +
3031 +#define ERROR(s, args...)      printk(KERN_ERR "SQUASHFS error: "s, ## args)
3032 +
3033 +#define SERROR(s, args...)     do { \
3034 +                               if (!silent) \
3035 +                               printk(KERN_ERR "SQUASHFS error: "s, ## args);\
3036 +                               } while(0)
3037 +
3038 +#define WARNING(s, args...)    printk(KERN_WARNING "SQUASHFS: "s, ## args)
3039 +
3040 +static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
3041 +{
3042 +       return list_entry(inode, struct squashfs_inode_info, vfs_inode);
3043 +}
3044 +
3045 +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
3046 +#define SQSH_EXTERN
3047 +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
3048 +                               long long index, unsigned int length,
3049 +                               long long *next_index);
3050 +extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
3051 +                               long long block, unsigned int offset,
3052 +                               int length, long long *next_block,
3053 +                               unsigned int *next_offset);
3054 +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
3055 +                                       squashfs_fragment_cache *fragment);
3056 +extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
3057 +                                       *s, long long start_block,
3058 +                                       int length);
3059 +extern struct address_space_operations squashfs_symlink_aops;
3060 +extern struct address_space_operations squashfs_aops;
3061 +extern struct address_space_operations squashfs_aops_4K;
3062 +extern struct inode_operations squashfs_dir_inode_ops;
3063 +#else
3064 +#define SQSH_EXTERN static
3065 +#endif
3066 +
3067 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3068 +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
3069 +#else
3070 +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
3071 +{
3072 +       return 0;
3073 +}
3074 +#endif
3075 +
3076 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3077 +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
3078 +#else
3079 +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
3080 +{
3081 +       return 0;
3082 +}
3083 +#endif
3084 Index: linux-2.6.21.7/include/linux/squashfs_fs.h
3085 ===================================================================
3086 --- /dev/null
3087 +++ linux-2.6.21.7/include/linux/squashfs_fs.h
3088 @@ -0,0 +1,911 @@
3089 +#ifndef SQUASHFS_FS
3090 +#define SQUASHFS_FS
3091 +
3092 +/*
3093 + * Squashfs
3094 + *
3095 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3096 + * Phillip Lougher <phillip@lougher.org.uk>
3097 + *
3098 + * This program is free software; you can redistribute it and/or
3099 + * modify it under the terms of the GNU General Public License
3100 + * as published by the Free Software Foundation; either version 2,
3101 + * or (at your option) any later version.
3102 + *
3103 + * This program is distributed in the hope that it will be useful,
3104 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3105 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3106 + * GNU General Public License for more details.
3107 + *
3108 + * You should have received a copy of the GNU General Public License
3109 + * along with this program; if not, write to the Free Software
3110 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3111 + *
3112 + * squashfs_fs.h
3113 + */
3114 +
3115 +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3116 +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
3117 +#endif
3118 +
3119 +#ifdef CONFIG_SQUASHFS_VMALLOC
3120 +#define SQUASHFS_ALLOC(a)              vmalloc(a)
3121 +#define SQUASHFS_FREE(a)               vfree(a)
3122 +#else
3123 +#define SQUASHFS_ALLOC(a)              kmalloc(a, GFP_KERNEL)
3124 +#define SQUASHFS_FREE(a)               kfree(a)
3125 +#endif
3126 +#define SQUASHFS_CACHED_FRAGMENTS      CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
3127 +#define SQUASHFS_MAJOR                 3
3128 +#define SQUASHFS_MINOR                 0
3129 +#define SQUASHFS_MAGIC                 0x73717368
3130 +#define SQUASHFS_MAGIC_SWAP            0x68737173
3131 +#define SQUASHFS_START                 0
3132 +
3133 +/* size of metadata (inode and directory) blocks */
3134 +#define SQUASHFS_METADATA_SIZE         8192
3135 +#define SQUASHFS_METADATA_LOG          13
3136 +
3137 +/* default size of data blocks */
3138 +#define SQUASHFS_FILE_SIZE             65536
3139 +#define SQUASHFS_FILE_LOG              16
3140 +
3141 +#define SQUASHFS_FILE_MAX_SIZE         65536
3142 +
3143 +/* Max number of uids and gids */
3144 +#define SQUASHFS_UIDS                  256
3145 +#define SQUASHFS_GUIDS                 255
3146 +
3147 +/* Max length of filename (not 255) */
3148 +#define SQUASHFS_NAME_LEN              256
3149 +
3150 +#define SQUASHFS_INVALID               ((long long) 0xffffffffffff)
3151 +#define SQUASHFS_INVALID_FRAG          ((unsigned int) 0xffffffff)
3152 +#define SQUASHFS_INVALID_BLK           ((long long) -1)
3153 +#define SQUASHFS_USED_BLK              ((long long) -2)
3154 +
3155 +/* Filesystem flags */
3156 +#define SQUASHFS_NOI                   0
3157 +#define SQUASHFS_NOD                   1
3158 +#define SQUASHFS_CHECK                 2
3159 +#define SQUASHFS_NOF                   3
3160 +#define SQUASHFS_NO_FRAG               4
3161 +#define SQUASHFS_ALWAYS_FRAG           5
3162 +#define SQUASHFS_DUPLICATE             6
3163 +
3164 +#define SQUASHFS_BIT(flag, bit)                ((flag >> bit) & 1)
3165 +
3166 +#define SQUASHFS_UNCOMPRESSED_INODES(flags)    SQUASHFS_BIT(flags, \
3167 +                                               SQUASHFS_NOI)
3168 +
3169 +#define SQUASHFS_UNCOMPRESSED_DATA(flags)      SQUASHFS_BIT(flags, \
3170 +                                               SQUASHFS_NOD)
3171 +
3172 +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
3173 +                                               SQUASHFS_NOF)
3174 +
3175 +#define SQUASHFS_NO_FRAGMENTS(flags)           SQUASHFS_BIT(flags, \
3176 +                                               SQUASHFS_NO_FRAG)
3177 +
3178 +#define SQUASHFS_ALWAYS_FRAGMENTS(flags)       SQUASHFS_BIT(flags, \
3179 +                                               SQUASHFS_ALWAYS_FRAG)
3180 +
3181 +#define SQUASHFS_DUPLICATES(flags)             SQUASHFS_BIT(flags, \
3182 +                                               SQUASHFS_DUPLICATE)
3183 +
3184 +#define SQUASHFS_CHECK_DATA(flags)             SQUASHFS_BIT(flags, \
3185 +                                               SQUASHFS_CHECK)
3186 +
3187 +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
3188 +               duplicate_checking)     (noi | (nod << 1) | (check_data << 2) \
3189 +               | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
3190 +               (duplicate_checking << 6))
3191 +
3192 +/* Max number of types and file types */
3193 +#define SQUASHFS_DIR_TYPE              1
3194 +#define SQUASHFS_FILE_TYPE             2
3195 +#define SQUASHFS_SYMLINK_TYPE          3
3196 +#define SQUASHFS_BLKDEV_TYPE           4
3197 +#define SQUASHFS_CHRDEV_TYPE           5
3198 +#define SQUASHFS_FIFO_TYPE             6
3199 +#define SQUASHFS_SOCKET_TYPE           7
3200 +#define SQUASHFS_LDIR_TYPE             8
3201 +#define SQUASHFS_LREG_TYPE             9
3202 +
3203 +/* 1.0 filesystem type definitions */
3204 +#define SQUASHFS_TYPES                 5
3205 +#define SQUASHFS_IPC_TYPE              0
3206 +
3207 +/* Flag whether block is compressed or uncompressed, bit is set if block is
3208 + * uncompressed */
3209 +#define SQUASHFS_COMPRESSED_BIT                (1 << 15)
3210 +
3211 +#define SQUASHFS_COMPRESSED_SIZE(B)    (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
3212 +               (B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)
3213 +
3214 +#define SQUASHFS_COMPRESSED(B)         (!((B) & SQUASHFS_COMPRESSED_BIT))
3215 +
3216 +#define SQUASHFS_COMPRESSED_BIT_BLOCK          (1 << 24)
3217 +
3218 +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)      (((B) & \
3219 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
3220 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
3221 +
3222 +#define SQUASHFS_COMPRESSED_BLOCK(B)   (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
3223 +
3224 +/*
3225 + * Inode number ops.  Inodes consist of a compressed block number, and an
3226 + * uncompressed  offset within that block
3227 + */
3228 +#define SQUASHFS_INODE_BLK(a)          ((unsigned int) ((a) >> 16))
3229 +
3230 +#define SQUASHFS_INODE_OFFSET(a)       ((unsigned int) ((a) & 0xffff))
3231 +
3232 +#define SQUASHFS_MKINODE(A, B)         ((squashfs_inode_t)(((squashfs_inode_t) (A)\
3233 +                                       << 16) + (B)))
3234 +
3235 +/* Compute 32 bit VFS inode number from squashfs inode number */
3236 +#define SQUASHFS_MK_VFS_INODE(a, b)    ((unsigned int) (((a) << 8) + \
3237 +                                       ((b) >> 2) + 1))
3238 +/* XXX */
3239 +
3240 +/* Translate between VFS mode and squashfs mode */
3241 +#define SQUASHFS_MODE(a)               ((a) & 0xfff)
3242 +
3243 +/* fragment and fragment table defines */
3244 +#define SQUASHFS_FRAGMENT_BYTES(A)     (A * sizeof(struct squashfs_fragment_entry))
3245 +
3246 +#define SQUASHFS_FRAGMENT_INDEX(A)     (SQUASHFS_FRAGMENT_BYTES(A) / \
3247 +                                       SQUASHFS_METADATA_SIZE)
3248 +
3249 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)      (SQUASHFS_FRAGMENT_BYTES(A) % \
3250 +                                               SQUASHFS_METADATA_SIZE)
3251 +
3252 +#define SQUASHFS_FRAGMENT_INDEXES(A)   ((SQUASHFS_FRAGMENT_BYTES(A) + \
3253 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3254 +                                       SQUASHFS_METADATA_SIZE)
3255 +
3256 +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)       (SQUASHFS_FRAGMENT_INDEXES(A) *\
3257 +                                               sizeof(long long))
3258 +
3259 +/* cached data constants for filesystem */
3260 +#define SQUASHFS_CACHED_BLKS           8
3261 +
3262 +#define SQUASHFS_MAX_FILE_SIZE_LOG     64
3263 +
3264 +#define SQUASHFS_MAX_FILE_SIZE         ((long long) 1 << \
3265 +                                       (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
3266 +
3267 +#define SQUASHFS_MARKER_BYTE           0xff
3268 +
3269 +/* meta index cache */
3270 +#define SQUASHFS_META_INDEXES  (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
3271 +#define SQUASHFS_META_ENTRIES  31
3272 +#define SQUASHFS_META_NUMBER   8
3273 +#define SQUASHFS_SLOTS         4
3274 +
3275 +struct meta_entry {
3276 +       long long               data_block;
3277 +       unsigned int            index_block;
3278 +       unsigned short          offset;
3279 +       unsigned short          pad;
3280 +};
3281 +
3282 +struct meta_index {
3283 +       unsigned int            inode_number;
3284 +       unsigned int            offset;
3285 +       unsigned short          entries;
3286 +       unsigned short          skip;
3287 +       unsigned short          locked;
3288 +       unsigned short          pad;
3289 +       struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
3290 +};
3291 +
3292 +
3293 +/*
3294 + * definitions for structures on disk
3295 + */
3296 +
3297 +typedef long long              squashfs_block_t;
3298 +typedef long long              squashfs_inode_t;
3299 +
3300 +struct squashfs_super_block {
3301 +       unsigned int            s_magic;
3302 +       unsigned int            inodes;
3303 +       unsigned int            bytes_used_2;
3304 +       unsigned int            uid_start_2;
3305 +       unsigned int            guid_start_2;
3306 +       unsigned int            inode_table_start_2;
3307 +       unsigned int            directory_table_start_2;
3308 +       unsigned int            s_major:16;
3309 +       unsigned int            s_minor:16;
3310 +       unsigned int            block_size_1:16;
3311 +       unsigned int            block_log:16;
3312 +       unsigned int            flags:8;
3313 +       unsigned int            no_uids:8;
3314 +       unsigned int            no_guids:8;
3315 +       unsigned int            mkfs_time /* time of filesystem creation */;
3316 +       squashfs_inode_t        root_inode;
3317 +       unsigned int            block_size;
3318 +       unsigned int            fragments;
3319 +       unsigned int            fragment_table_start_2;
3320 +       long long               bytes_used;
3321 +       long long               uid_start;
3322 +       long long               guid_start;
3323 +       long long               inode_table_start;
3324 +       long long               directory_table_start;
3325 +       long long               fragment_table_start;
3326 +       long long               unused;
3327 +} __attribute__ ((packed));
3328 +
3329 +struct squashfs_dir_index {
3330 +       unsigned int            index;
3331 +       unsigned int            start_block;
3332 +       unsigned char           size;
3333 +       unsigned char           name[0];
3334 +} __attribute__ ((packed));
3335 +
3336 +#define SQUASHFS_BASE_INODE_HEADER             \
3337 +       unsigned int            inode_type:4;   \
3338 +       unsigned int            mode:12;        \
3339 +       unsigned int            uid:8;          \
3340 +       unsigned int            guid:8;         \
3341 +       unsigned int            mtime;          \
3342 +       unsigned int            inode_number;
3343 +
3344 +struct squashfs_base_inode_header {
3345 +       SQUASHFS_BASE_INODE_HEADER;
3346 +} __attribute__ ((packed));
3347 +
3348 +struct squashfs_ipc_inode_header {
3349 +       SQUASHFS_BASE_INODE_HEADER;
3350 +       unsigned int            nlink;
3351 +} __attribute__ ((packed));
3352 +
3353 +struct squashfs_dev_inode_header {
3354 +       SQUASHFS_BASE_INODE_HEADER;
3355 +       unsigned int            nlink;
3356 +       unsigned short          rdev;
3357 +} __attribute__ ((packed));
3358 +
3359 +struct squashfs_symlink_inode_header {
3360 +       SQUASHFS_BASE_INODE_HEADER;
3361 +       unsigned int            nlink;
3362 +       unsigned short          symlink_size;
3363 +       char                    symlink[0];
3364 +} __attribute__ ((packed));
3365 +
3366 +struct squashfs_reg_inode_header {
3367 +       SQUASHFS_BASE_INODE_HEADER;
3368 +       squashfs_block_t        start_block;
3369 +       unsigned int            fragment;
3370 +       unsigned int            offset;
3371 +       unsigned int            file_size;
3372 +       unsigned short          block_list[0];
3373 +} __attribute__ ((packed));
3374 +
3375 +struct squashfs_lreg_inode_header {
3376 +       SQUASHFS_BASE_INODE_HEADER;
3377 +       unsigned int            nlink;
3378 +       squashfs_block_t        start_block;
3379 +       unsigned int            fragment;
3380 +       unsigned int            offset;
3381 +       long long               file_size;
3382 +       unsigned short          block_list[0];
3383 +} __attribute__ ((packed));
3384 +
3385 +struct squashfs_dir_inode_header {
3386 +       SQUASHFS_BASE_INODE_HEADER;
3387 +       unsigned int            nlink;
3388 +       unsigned int            file_size:19;
3389 +       unsigned int            offset:13;
3390 +       unsigned int            start_block;
3391 +       unsigned int            parent_inode;
3392 +} __attribute__  ((packed));
3393 +
3394 +struct squashfs_ldir_inode_header {
3395 +       SQUASHFS_BASE_INODE_HEADER;
3396 +       unsigned int            nlink;
3397 +       unsigned int            file_size:27;
3398 +       unsigned int            offset:13;
3399 +       unsigned int            start_block;
3400 +       unsigned int            i_count:16;
3401 +       unsigned int            parent_inode;
3402 +       struct squashfs_dir_index       index[0];
3403 +} __attribute__  ((packed));
3404 +
3405 +union squashfs_inode_header {
3406 +       struct squashfs_base_inode_header       base;
3407 +       struct squashfs_dev_inode_header        dev;
3408 +       struct squashfs_symlink_inode_header    symlink;
3409 +       struct squashfs_reg_inode_header        reg;
3410 +       struct squashfs_lreg_inode_header       lreg;
3411 +       struct squashfs_dir_inode_header        dir;
3412 +       struct squashfs_ldir_inode_header       ldir;
3413 +       struct squashfs_ipc_inode_header        ipc;
3414 +};
3415 +
3416 +struct squashfs_dir_entry {
3417 +       unsigned int            offset:13;
3418 +       unsigned int            type:3;
3419 +       unsigned int            size:8;
3420 +       int                     inode_number:16;
3421 +       char                    name[0];
3422 +} __attribute__ ((packed));
3423 +
3424 +struct squashfs_dir_header {
3425 +       unsigned int            count:8;
3426 +       unsigned int            start_block;
3427 +       unsigned int            inode_number;
3428 +} __attribute__ ((packed));
3429 +
3430 +struct squashfs_fragment_entry {
3431 +       long long               start_block;
3432 +       unsigned int            size;
3433 +       unsigned int            unused;
3434 +} __attribute__ ((packed));
3435 +
3436 +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
3437 +extern int squashfs_uncompress_init(void);
3438 +extern int squashfs_uncompress_exit(void);
3439 +
3440 +/*
3441 + * macros to convert each packed bitfield structure from little endian to big
3442 + * endian and vice versa.  These are needed when creating or using a filesystem
3443 + * on a machine with different byte ordering to the target architecture.
3444 + *
3445 + */
3446 +
3447 +#define SQUASHFS_SWAP_START \
3448 +       int bits;\
3449 +       int b_pos;\
3450 +       unsigned long long val;\
3451 +       unsigned char *s;\
3452 +       unsigned char *d;
3453 +
3454 +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
3455 +       SQUASHFS_SWAP_START\
3456 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
3457 +       SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
3458 +       SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
3459 +       SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
3460 +       SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
3461 +       SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
3462 +       SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
3463 +       SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
3464 +       SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
3465 +       SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
3466 +       SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\
3467 +       SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
3468 +       SQUASHFS_SWAP((s)->flags, d, 288, 8);\
3469 +       SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
3470 +       SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
3471 +       SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
3472 +       SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
3473 +       SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
3474 +       SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
3475 +       SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
3476 +       SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
3477 +       SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
3478 +       SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
3479 +       SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
3480 +       SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
3481 +       SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
3482 +       SQUASHFS_SWAP((s)->unused, d, 888, 64);\
3483 +}
3484 +
3485 +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3486 +       SQUASHFS_MEMSET(s, d, n);\
3487 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3488 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3489 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3490 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3491 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3492 +       SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
3493 +
3494 +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
3495 +       SQUASHFS_SWAP_START\
3496 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3497 +}
3498 +
3499 +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
3500 +       SQUASHFS_SWAP_START\
3501 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3502 +                       sizeof(struct squashfs_ipc_inode_header))\
3503 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3504 +}
3505 +
3506 +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
3507 +       SQUASHFS_SWAP_START\
3508 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3509 +                       sizeof(struct squashfs_dev_inode_header)); \
3510 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3511 +       SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
3512 +}
3513 +
3514 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
3515 +       SQUASHFS_SWAP_START\
3516 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3517 +                       sizeof(struct squashfs_symlink_inode_header));\
3518 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3519 +       SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
3520 +}
3521 +
3522 +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
3523 +       SQUASHFS_SWAP_START\
3524 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3525 +                       sizeof(struct squashfs_reg_inode_header));\
3526 +       SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
3527 +       SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
3528 +       SQUASHFS_SWAP((s)->offset, d, 192, 32);\
3529 +       SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
3530 +}
3531 +
3532 +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
3533 +       SQUASHFS_SWAP_START\
3534 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3535 +                       sizeof(struct squashfs_lreg_inode_header));\
3536 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3537 +       SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
3538 +       SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
3539 +       SQUASHFS_SWAP((s)->offset, d, 224, 32);\
3540 +       SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
3541 +}
3542 +
3543 +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
3544 +       SQUASHFS_SWAP_START\
3545 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3546 +                       sizeof(struct squashfs_dir_inode_header));\
3547 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3548 +       SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
3549 +       SQUASHFS_SWAP((s)->offset, d, 147, 13);\
3550 +       SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
3551 +       SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
3552 +}
3553 +
3554 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
3555 +       SQUASHFS_SWAP_START\
3556 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3557 +                       sizeof(struct squashfs_ldir_inode_header));\
3558 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3559 +       SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
3560 +       SQUASHFS_SWAP((s)->offset, d, 155, 13);\
3561 +       SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
3562 +       SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
3563 +       SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
3564 +}
3565 +
3566 +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
3567 +       SQUASHFS_SWAP_START\
3568 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
3569 +       SQUASHFS_SWAP((s)->index, d, 0, 32);\
3570 +       SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
3571 +       SQUASHFS_SWAP((s)->size, d, 64, 8);\
3572 +}
3573 +
3574 +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
3575 +       SQUASHFS_SWAP_START\
3576 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
3577 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3578 +       SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
3579 +       SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
3580 +}
3581 +
3582 +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
3583 +       SQUASHFS_SWAP_START\
3584 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
3585 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3586 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3587 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3588 +       SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
3589 +}
3590 +
3591 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
3592 +       SQUASHFS_SWAP_START\
3593 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
3594 +       SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
3595 +       SQUASHFS_SWAP((s)->size, d, 64, 32);\
3596 +}
3597 +
3598 +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
3599 +       int entry;\
3600 +       int bit_position;\
3601 +       SQUASHFS_SWAP_START\
3602 +       SQUASHFS_MEMSET(s, d, n * 2);\
3603 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3604 +                       16)\
3605 +               SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
3606 +}
3607 +
3608 +#define SQUASHFS_SWAP_INTS(s, d, n) {\
3609 +       int entry;\
3610 +       int bit_position;\
3611 +       SQUASHFS_SWAP_START\
3612 +       SQUASHFS_MEMSET(s, d, n * 4);\
3613 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3614 +                       32)\
3615 +               SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
3616 +}
3617 +
3618 +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
3619 +       int entry;\
3620 +       int bit_position;\
3621 +       SQUASHFS_SWAP_START\
3622 +       SQUASHFS_MEMSET(s, d, n * 8);\
3623 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3624 +                       64)\
3625 +               SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
3626 +}
3627 +
3628 +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
3629 +       int entry;\
3630 +       int bit_position;\
3631 +       SQUASHFS_SWAP_START\
3632 +       SQUASHFS_MEMSET(s, d, n * bits / 8);\
3633 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3634 +                       bits)\
3635 +               SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
3636 +}
3637 +
3638 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
3639 +
3640 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3641 +
3642 +struct squashfs_base_inode_header_1 {
3643 +       unsigned int            inode_type:4;
3644 +       unsigned int            mode:12; /* protection */
3645 +       unsigned int            uid:4; /* index into uid table */
3646 +       unsigned int            guid:4; /* index into guid table */
3647 +} __attribute__ ((packed));
3648 +
3649 +struct squashfs_ipc_inode_header_1 {
3650 +       unsigned int            inode_type:4;
3651 +       unsigned int            mode:12; /* protection */
3652 +       unsigned int            uid:4; /* index into uid table */
3653 +       unsigned int            guid:4; /* index into guid table */
3654 +       unsigned int            type:4;
3655 +       unsigned int            offset:4;
3656 +} __attribute__ ((packed));
3657 +
3658 +struct squashfs_dev_inode_header_1 {
3659 +       unsigned int            inode_type:4;
3660 +       unsigned int            mode:12; /* protection */
3661 +       unsigned int            uid:4; /* index into uid table */
3662 +       unsigned int            guid:4; /* index into guid table */
3663 +       unsigned short          rdev;
3664 +} __attribute__ ((packed));
3665 +
3666 +struct squashfs_symlink_inode_header_1 {
3667 +       unsigned int            inode_type:4;
3668 +       unsigned int            mode:12; /* protection */
3669 +       unsigned int            uid:4; /* index into uid table */
3670 +       unsigned int            guid:4; /* index into guid table */
3671 +       unsigned short          symlink_size;
3672 +       char                    symlink[0];
3673 +} __attribute__ ((packed));
3674 +
3675 +struct squashfs_reg_inode_header_1 {
3676 +       unsigned int            inode_type:4;
3677 +       unsigned int            mode:12; /* protection */
3678 +       unsigned int            uid:4; /* index into uid table */
3679 +       unsigned int            guid:4; /* index into guid table */
3680 +       unsigned int            mtime;
3681 +       unsigned int            start_block;
3682 +       unsigned int            file_size:32;
3683 +       unsigned short          block_list[0];
3684 +} __attribute__ ((packed));
3685 +
3686 +struct squashfs_dir_inode_header_1 {
3687 +       unsigned int            inode_type:4;
3688 +       unsigned int            mode:12; /* protection */
3689 +       unsigned int            uid:4; /* index into uid table */
3690 +       unsigned int            guid:4; /* index into guid table */
3691 +       unsigned int            file_size:19;
3692 +       unsigned int            offset:13;
3693 +       unsigned int            mtime;
3694 +       unsigned int            start_block:24;
3695 +} __attribute__  ((packed));
3696 +
3697 +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \
3698 +       SQUASHFS_MEMSET(s, d, n);\
3699 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3700 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3701 +       SQUASHFS_SWAP((s)->uid, d, 16, 4);\
3702 +       SQUASHFS_SWAP((s)->guid, d, 20, 4);
3703 +
3704 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
3705 +       SQUASHFS_SWAP_START\
3706 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
3707 +}
3708 +
3709 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
3710 +       SQUASHFS_SWAP_START\
3711 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3712 +                       sizeof(struct squashfs_ipc_inode_header_1));\
3713 +       SQUASHFS_SWAP((s)->type, d, 24, 4);\
3714 +       SQUASHFS_SWAP((s)->offset, d, 28, 4);\
3715 +}
3716 +
3717 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
3718 +       SQUASHFS_SWAP_START\
3719 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3720 +                       sizeof(struct squashfs_dev_inode_header_1));\
3721 +       SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
3722 +}
3723 +
3724 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
3725 +       SQUASHFS_SWAP_START\
3726 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3727 +                       sizeof(struct squashfs_symlink_inode_header_1));\
3728 +       SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
3729 +}
3730 +
3731 +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
3732 +       SQUASHFS_SWAP_START\
3733 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3734 +                       sizeof(struct squashfs_reg_inode_header_1));\
3735 +       SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
3736 +       SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
3737 +       SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
3738 +}
3739 +
3740 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
3741 +       SQUASHFS_SWAP_START\
3742 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3743 +                       sizeof(struct squashfs_dir_inode_header_1));\
3744 +       SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
3745 +       SQUASHFS_SWAP((s)->offset, d, 43, 13);\
3746 +       SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
3747 +       SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
3748 +}
3749 +
3750 +#endif
3751 +
3752 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3753 +
3754 +struct squashfs_dir_index_2 {
3755 +       unsigned int            index:27;
3756 +       unsigned int            start_block:29;
3757 +       unsigned char           size;
3758 +       unsigned char           name[0];
3759 +} __attribute__ ((packed));
3760 +
3761 +struct squashfs_base_inode_header_2 {
3762 +       unsigned int            inode_type:4;
3763 +       unsigned int            mode:12; /* protection */
3764 +       unsigned int            uid:8; /* index into uid table */
3765 +       unsigned int            guid:8; /* index into guid table */
3766 +} __attribute__ ((packed));
3767 +
3768 +struct squashfs_ipc_inode_header_2 {
3769 +       unsigned int            inode_type:4;
3770 +       unsigned int            mode:12; /* protection */
3771 +       unsigned int            uid:8; /* index into uid table */
3772 +       unsigned int            guid:8; /* index into guid table */
3773 +} __attribute__ ((packed));
3774 +
3775 +struct squashfs_dev_inode_header_2 {
3776 +       unsigned int            inode_type:4;
3777 +       unsigned int            mode:12; /* protection */
3778 +       unsigned int            uid:8; /* index into uid table */
3779 +       unsigned int            guid:8; /* index into guid table */
3780 +       unsigned short          rdev;
3781 +} __attribute__ ((packed));
3782 +
3783 +struct squashfs_symlink_inode_header_2 {
3784 +       unsigned int            inode_type:4;
3785 +       unsigned int            mode:12; /* protection */
3786 +       unsigned int            uid:8; /* index into uid table */
3787 +       unsigned int            guid:8; /* index into guid table */
3788 +       unsigned short          symlink_size;
3789 +       char                    symlink[0];
3790 +} __attribute__ ((packed));
3791 +
3792 +struct squashfs_reg_inode_header_2 {
3793 +       unsigned int            inode_type:4;
3794 +       unsigned int            mode:12; /* protection */
3795 +       unsigned int            uid:8; /* index into uid table */
3796 +       unsigned int            guid:8; /* index into guid table */
3797 +       unsigned int            mtime;
3798 +       unsigned int            start_block;
3799 +       unsigned int            fragment;
3800 +       unsigned int            offset;
3801 +       unsigned int            file_size:32;
3802 +       unsigned short          block_list[0];
3803 +} __attribute__ ((packed));
3804 +
3805 +struct squashfs_dir_inode_header_2 {
3806 +       unsigned int            inode_type:4;
3807 +       unsigned int            mode:12; /* protection */
3808 +       unsigned int            uid:8; /* index into uid table */
3809 +       unsigned int            guid:8; /* index into guid table */
3810 +       unsigned int            file_size:19;
3811 +       unsigned int            offset:13;
3812 +       unsigned int            mtime;
3813 +       unsigned int            start_block:24;
3814 +} __attribute__  ((packed));
3815 +
3816 +struct squashfs_ldir_inode_header_2 {
3817 +       unsigned int            inode_type:4;
3818 +       unsigned int            mode:12; /* protection */
3819 +       unsigned int            uid:8; /* index into uid table */
3820 +       unsigned int            guid:8; /* index into guid table */
3821 +       unsigned int            file_size:27;
3822 +       unsigned int            offset:13;
3823 +       unsigned int            mtime;
3824 +       unsigned int            start_block:24;
3825 +       unsigned int            i_count:16;
3826 +       struct squashfs_dir_index_2     index[0];
3827 +} __attribute__  ((packed));
3828 +
3829 +union squashfs_inode_header_2 {
3830 +       struct squashfs_base_inode_header_2     base;
3831 +       struct squashfs_dev_inode_header_2      dev;
3832 +       struct squashfs_symlink_inode_header_2  symlink;
3833 +       struct squashfs_reg_inode_header_2      reg;
3834 +       struct squashfs_dir_inode_header_2      dir;
3835 +       struct squashfs_ldir_inode_header_2     ldir;
3836 +       struct squashfs_ipc_inode_header_2      ipc;
3837 +};
3838 +
3839 +struct squashfs_dir_header_2 {
3840 +       unsigned int            count:8;
3841 +       unsigned int            start_block:24;
3842 +} __attribute__ ((packed));
3843 +
3844 +struct squashfs_dir_entry_2 {
3845 +       unsigned int            offset:13;
3846 +       unsigned int            type:3;
3847 +       unsigned int            size:8;
3848 +       char                    name[0];
3849 +} __attribute__ ((packed));
3850 +
3851 +struct squashfs_fragment_entry_2 {
3852 +       unsigned int            start_block;
3853 +       unsigned int            size;
3854 +} __attribute__ ((packed));
3855 +
3856 +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3857 +       SQUASHFS_MEMSET(s, d, n);\
3858 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3859 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3860 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3861 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3862 +
3863 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
3864 +       SQUASHFS_SWAP_START\
3865 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3866 +}
3867 +
3868 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
3869 +       SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
3870 +
3871 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
3872 +       SQUASHFS_SWAP_START\
3873 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3874 +                       sizeof(struct squashfs_dev_inode_header_2)); \
3875 +       SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
3876 +}
3877 +
3878 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
3879 +       SQUASHFS_SWAP_START\
3880 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3881 +                       sizeof(struct squashfs_symlink_inode_header_2));\
3882 +       SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
3883 +}
3884 +
3885 +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
3886 +       SQUASHFS_SWAP_START\
3887 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3888 +                       sizeof(struct squashfs_reg_inode_header_2));\
3889 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3890 +       SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
3891 +       SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
3892 +       SQUASHFS_SWAP((s)->offset, d, 128, 32);\
3893 +       SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
3894 +}
3895 +
3896 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
3897 +       SQUASHFS_SWAP_START\
3898 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3899 +                       sizeof(struct squashfs_dir_inode_header_2));\
3900 +       SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
3901 +       SQUASHFS_SWAP((s)->offset, d, 51, 13);\
3902 +       SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
3903 +       SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
3904 +}
3905 +
3906 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
3907 +       SQUASHFS_SWAP_START\
3908 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3909 +                       sizeof(struct squashfs_ldir_inode_header_2));\
3910 +       SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
3911 +       SQUASHFS_SWAP((s)->offset, d, 59, 13);\
3912 +       SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
3913 +       SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
3914 +       SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
3915 +}
3916 +
3917 +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
3918 +       SQUASHFS_SWAP_START\
3919 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
3920 +       SQUASHFS_SWAP((s)->index, d, 0, 27);\
3921 +       SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
3922 +       SQUASHFS_SWAP((s)->size, d, 56, 8);\
3923 +}
3924 +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
3925 +       SQUASHFS_SWAP_START\
3926 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
3927 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3928 +       SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
3929 +}
3930 +
3931 +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
3932 +       SQUASHFS_SWAP_START\
3933 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
3934 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3935 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3936 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3937 +}
3938 +
3939 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
3940 +       SQUASHFS_SWAP_START\
3941 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
3942 +       SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
3943 +       SQUASHFS_SWAP((s)->size, d, 32, 32);\
3944 +}
3945 +
3946 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
3947 +
3948 +/* fragment and fragment table defines */
3949 +#define SQUASHFS_FRAGMENT_BYTES_2(A)   (A * sizeof(struct squashfs_fragment_entry_2))
3950 +
3951 +#define SQUASHFS_FRAGMENT_INDEX_2(A)   (SQUASHFS_FRAGMENT_BYTES_2(A) / \
3952 +                                       SQUASHFS_METADATA_SIZE)
3953 +
3954 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A)    (SQUASHFS_FRAGMENT_BYTES_2(A) % \
3955 +                                               SQUASHFS_METADATA_SIZE)
3956 +
3957 +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \
3958 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3959 +                                       SQUASHFS_METADATA_SIZE)
3960 +
3961 +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A)     (SQUASHFS_FRAGMENT_INDEXES_2(A) *\
3962 +                                               sizeof(int))
3963 +
3964 +#endif
3965 +
3966 +#ifdef __KERNEL__
3967 +
3968 +/*
3969 + * macros used to swap each structure entry, taking into account
3970 + * bitfields and different bitfield placing conventions on differing
3971 + * architectures
3972 + */
3973 +
3974 +#include <asm/byteorder.h>
3975 +
3976 +#ifdef __BIG_ENDIAN
3977 +       /* convert from little endian to big endian */
3978 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3979 +               tbits, b_pos)
3980 +#else
3981 +       /* convert from big endian to little endian */
3982 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3983 +               tbits, 64 - tbits - b_pos)
3984 +#endif
3985 +
3986 +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
3987 +       b_pos = pos % 8;\
3988 +       val = 0;\
3989 +       s = (unsigned char *)p + (pos / 8);\
3990 +       d = ((unsigned char *) &val) + 7;\
3991 +       for(bits = 0; bits < (tbits + b_pos); bits += 8) \
3992 +               *d-- = *s++;\
3993 +       value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
3994 +}
3995 +
3996 +#define SQUASHFS_MEMSET(s, d, n)       memset(s, 0, n);
3997 +
3998 +#endif
3999 +#endif
4000 Index: linux-2.6.21.7/include/linux/squashfs_fs_i.h
4001 ===================================================================
4002 --- /dev/null
4003 +++ linux-2.6.21.7/include/linux/squashfs_fs_i.h
4004 @@ -0,0 +1,45 @@
4005 +#ifndef SQUASHFS_FS_I
4006 +#define SQUASHFS_FS_I
4007 +/*
4008 + * Squashfs
4009 + *
4010 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
4011 + * Phillip Lougher <phillip@lougher.org.uk>
4012 + *
4013 + * This program is free software; you can redistribute it and/or
4014 + * modify it under the terms of the GNU General Public License
4015 + * as published by the Free Software Foundation; either version 2,
4016 + * or (at your option) any later version.
4017 + *
4018 + * This program is distributed in the hope that it will be useful,
4019 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4020 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
4021 + * GNU General Public License for more details.
4022 + *
4023 + * You should have received a copy of the GNU General Public License
4024 + * along with this program; if not, write to the Free Software
4025 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
4026 + *
4027 + * squashfs_fs_i.h
4028 + */
4029 +
4030 +struct squashfs_inode_info {
4031 +       long long       start_block;
4032 +       unsigned int    offset;
4033 +       union {
4034 +               struct {
4035 +                       long long       fragment_start_block;
4036 +                       unsigned int    fragment_size;
4037 +                       unsigned int    fragment_offset;
4038 +                       long long       block_list_start;
4039 +               } s1;
4040 +               struct {
4041 +                       long long       directory_index_start;
4042 +                       unsigned int    directory_index_offset;
4043 +                       unsigned int    directory_index_count;
4044 +                       unsigned int    parent_inode;
4045 +               } s2;
4046 +       } u;
4047 +       struct inode    vfs_inode;
4048 +};
4049 +#endif
4050 Index: linux-2.6.21.7/include/linux/squashfs_fs_sb.h
4051 ===================================================================
4052 --- /dev/null
4053 +++ linux-2.6.21.7/include/linux/squashfs_fs_sb.h
4054 @@ -0,0 +1,74 @@
4055 +#ifndef SQUASHFS_FS_SB
4056 +#define SQUASHFS_FS_SB
4057 +/*
4058 + * Squashfs
4059 + *
4060 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
4061 + * Phillip Lougher <phillip@lougher.org.uk>
4062 + *
4063 + * This program is free software; you can redistribute it and/or
4064 + * modify it under the terms of the GNU General Public License
4065 + * as published by the Free Software Foundation; either version 2,
4066 + * or (at your option) any later version.
4067 + *
4068 + * This program is distributed in the hope that it will be useful,
4069 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4070 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
4071 + * GNU General Public License for more details.
4072 + *
4073 + * You should have received a copy of the GNU General Public License
4074 + * along with this program; if not, write to the Free Software
4075 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
4076 + *
4077 + * squashfs_fs_sb.h
4078 + */
4079 +
4080 +#include <linux/squashfs_fs.h>
4081 +
4082 +struct squashfs_cache {
4083 +       long long       block;
4084 +       int             length;
4085 +       long long       next_index;
4086 +       char            *data;
4087 +};
4088 +
4089 +struct squashfs_fragment_cache {
4090 +       long long       block;
4091 +       int             length;
4092 +       unsigned int    locked;
4093 +       char            *data;
4094 +};
4095 +
4096 +struct squashfs_sb_info {
4097 +       struct squashfs_super_block     sblk;
4098 +       int                     devblksize;
4099 +       int                     devblksize_log2;
4100 +       int                     swap;
4101 +       struct squashfs_cache   *block_cache;
4102 +       struct squashfs_fragment_cache  *fragment;
4103 +       int                     next_cache;
4104 +       int                     next_fragment;
4105 +       int                     next_meta_index;
4106 +       unsigned int            *uid;
4107 +       unsigned int            *guid;
4108 +       long long               *fragment_index;
4109 +       unsigned int            *fragment_index_2;
4110 +       unsigned int            read_size;
4111 +       char                    *read_data;
4112 +       char                    *read_page;
4113 +       struct semaphore        read_data_mutex;
4114 +       struct semaphore        read_page_mutex;
4115 +       struct semaphore        block_cache_mutex;
4116 +       struct semaphore        fragment_mutex;
4117 +       struct semaphore        meta_index_mutex;
4118 +       wait_queue_head_t       waitq;
4119 +       wait_queue_head_t       fragment_wait_queue;
4120 +       struct meta_index       *meta_index;
4121 +       struct inode            *(*iget)(struct super_block *s,  squashfs_inode_t \
4122 +                               inode);
4123 +       long long               (*read_blocklist)(struct inode *inode, int \
4124 +                               index, int readahead_blks, char *block_list, \
4125 +                               unsigned short **block_p, unsigned int *bsize);
4126 +       int                     (*read_fragment_index_table)(struct super_block *s);
4127 +};
4128 +#endif
4129 Index: linux-2.6.21.7/init/do_mounts_rd.c
4130 ===================================================================
4131 --- linux-2.6.21.7.orig/init/do_mounts_rd.c
4132 +++ linux-2.6.21.7/init/do_mounts_rd.c
4133 @@ -5,6 +5,7 @@
4134  #include <linux/ext2_fs.h>
4135  #include <linux/romfs_fs.h>
4136  #include <linux/cramfs_fs.h>
4137 +#include <linux/squashfs_fs.h>
4138  #include <linux/initrd.h>
4139  #include <linux/string.h>
4140
4141 @@ -39,6 +40,7 @@ static int __init crd_load(int in_fd, in
4142   * numbers could not be found.
4143   *
4144   * We currently check for the following magic numbers:
4145 + *      squashfs
4146   *     minix
4147   *     ext2
4148   *     romfs
4149 @@ -53,6 +55,7 @@ identify_ramdisk_image(int fd, int start
4150         struct ext2_super_block *ext2sb;
4151         struct romfs_super_block *romfsb;
4152         struct cramfs_super *cramfsb;
4153 +       struct squashfs_super_block *squashfsb;
4154         int nblocks = -1;
4155         unsigned char *buf;
4156
4157 @@ -64,6 +67,7 @@ identify_ramdisk_image(int fd, int start
4158         ext2sb = (struct ext2_super_block *) buf;
4159         romfsb = (struct romfs_super_block *) buf;
4160         cramfsb = (struct cramfs_super *) buf;
4161 +       squashfsb = (struct squashfs_super_block *) buf;
4162         memset(buf, 0xe5, size);
4163
4164         /*
4165 @@ -101,6 +105,15 @@ identify_ramdisk_image(int fd, int start
4166                 goto done;
4167         }
4168
4169 +       /* squashfs is at block zero too */
4170 +       if (squashfsb->s_magic == SQUASHFS_MAGIC) {
4171 +               printk(KERN_NOTICE
4172 +                      "RAMDISK: squashfs filesystem found at block %d\n",
4173 +                      start_block);
4174 +               nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
4175 +               goto done;
4176 +       }
4177 +
4178         /*
4179          * Read block 1 to test for minix and ext2 superblock
4180          */