target/linux/generic-2.6/patches-2.6.24/001-squashfs.patch

   1 --- a/fs/Kconfig
   2 +++ b/fs/Kconfig
   3 @@ -1405,6 +1405,71 @@ config CRAMFS
   4
   5           If unsure, say N.
   6
   7 +config SQUASHFS
   8 +       tristate "SquashFS 3.0 - Squashed file system support"
   9 +       select ZLIB_INFLATE
  10 +       help
  11 +         Saying Y here includes support for SquashFS 3.0 (a Compressed Read-Only File
  12 +         System).  Squashfs is a highly compressed read-only filesystem for Linux.
  13 +         It uses zlib compression to compress both files, inodes and directories.
  14 +         Inodes in the system are very small and all blocks are packed to minimise
  15 +         data overhead. Block sizes greater than 4K are supported up to a maximum of 64K.
  16 +         SquashFS 3.0 supports 64 bit filesystems and files (larger than 4GB), full
  17 +         uid/gid information, hard links and timestamps.
  18 +
  19 +         Squashfs is intended for general read-only filesystem use, for archival
  20 +         use (i.e. in cases where a .tar.gz file may be used), and in embedded
  21 +         systems where low overhead is needed.  Further information and filesystem tools
  22 +         are available from http://squashfs.sourceforge.net.
  23 +
  24 +         If you want to compile this as a module ( = code which can be
  25 +         inserted in and removed from the running kernel whenever you want),
  26 +         say M here and read <file:Documentation/modules.txt>.  The module
  27 +         will be called squashfs.  Note that the root file system (the one
  28 +         containing the directory /) cannot be compiled as a module.
  29 +
  30 +         If unsure, say N.
  31 +
  32 +config SQUASHFS_EMBEDDED
  33 +
  34 +       bool "Additional options for memory-constrained systems"
  35 +       depends on SQUASHFS
  36 +       default n
  37 +       help
  38 +         Saying Y here allows you to specify cache sizes and how Squashfs
  39 +         allocates memory.  This is only intended for memory constrained
  40 +         systems.
  41 +
  42 +         If unsure, say N.
  43 +
  44 +config SQUASHFS_FRAGMENT_CACHE_SIZE
  45 +       int "Number of fragments cached" if SQUASHFS_EMBEDDED
  46 +       depends on SQUASHFS
  47 +       default "3"
  48 +       help
  49 +         By default SquashFS caches the last 3 fragments read from
  50 +         the filesystem.  Increasing this amount may mean SquashFS
  51 +         has to re-read fragments less often from disk, at the expense
  52 +         of extra system memory.  Decreasing this amount will mean
  53 +         SquashFS uses less memory at the expense of extra reads from disk.
  54 +
  55 +         Note there must be at least one cached fragment.  Anything
  56 +         much more than three will probably not make much difference.
  57 +
  58 +config SQUASHFS_VMALLOC
  59 +       bool "Use Vmalloc rather than Kmalloc" if SQUASHFS_EMBEDDED
  60 +       depends on SQUASHFS
  61 +       default n
  62 +       help
  63 +         By default SquashFS uses kmalloc to obtain fragment cache memory.
  64 +         Kmalloc memory is the standard kernel allocator, but it can fail
  65 +         on memory constrained systems.  Because of the way Vmalloc works,
  66 +         Vmalloc can succeed when kmalloc fails.  Specifying this option
  67 +         will make SquashFS always use Vmalloc to allocate the
  68 +         fragment cache memory.
  69 +
  70 +         If unsure, say N.
  71 +
  72  config VXFS_FS
  73         tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
  74         depends on BLOCK
  75 --- a/fs/Makefile
  76 +++ b/fs/Makefile
  77 @@ -72,6 +72,7 @@ obj-$(CONFIG_JBD)             += jbd/
  78  obj-$(CONFIG_JBD2)             += jbd2/
  79  obj-$(CONFIG_EXT2_FS)          += ext2/
  80  obj-$(CONFIG_CRAMFS)           += cramfs/
  81 +obj-$(CONFIG_SQUASHFS)         += squashfs/
  82  obj-y                          += ramfs/
  83  obj-$(CONFIG_HUGETLBFS)                += hugetlbfs/
  84  obj-$(CONFIG_CODA_FS)          += coda/
  85 --- /dev/null
  86 +++ b/fs/squashfs/inode.c
  87 @@ -0,0 +1,2122 @@
  88 +/*
  89 + * Squashfs - a compressed read only filesystem for Linux
  90 + *
  91 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
  92 + * Phillip Lougher <phillip@lougher.org.uk>
  93 + *
  94 + * This program is free software; you can redistribute it and/or
  95 + * modify it under the terms of the GNU General Public License
  96 + * as published by the Free Software Foundation; either version 2,
  97 + * or (at your option) any later version.
  98 + *
  99 + * This program is distributed in the hope that it will be useful,
 100 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 101 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 102 + * GNU General Public License for more details.
 103 + *
 104 + * You should have received a copy of the GNU General Public License
 105 + * along with this program; if not, write to the Free Software
 106 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 107 + *
 108 + * inode.c
 109 + */
 110 +
 111 +#include <linux/types.h>
 112 +#include <linux/squashfs_fs.h>
 113 +#include <linux/module.h>
 114 +#include <linux/errno.h>
 115 +#include <linux/slab.h>
 116 +#include <linux/fs.h>
 117 +#include <linux/smp_lock.h>
 118 +#include <linux/slab.h>
 119 +#include <linux/squashfs_fs_sb.h>
 120 +#include <linux/squashfs_fs_i.h>
 121 +#include <linux/buffer_head.h>
 122 +#include <linux/vfs.h>
 123 +#include <linux/init.h>
 124 +#include <linux/dcache.h>
 125 +#include <linux/wait.h>
 126 +#include <linux/zlib.h>
 127 +#include <linux/blkdev.h>
 128 +#include <linux/vmalloc.h>
 129 +#include <asm/uaccess.h>
 130 +#include <asm/semaphore.h>
 131 +
 132 +#include "squashfs.h"
 133 +
 134 +static void squashfs_put_super(struct super_block *);
 135 +static int squashfs_statfs(struct dentry *, struct kstatfs *);
 136 +static int squashfs_symlink_readpage(struct file *file, struct page *page);
 137 +static int squashfs_readpage(struct file *file, struct page *page);
 138 +static int squashfs_readpage4K(struct file *file, struct page *page);
 139 +static int squashfs_readdir(struct file *, void *, filldir_t);
 140 +static struct inode *squashfs_alloc_inode(struct super_block *sb);
 141 +static void squashfs_destroy_inode(struct inode *inode);
 142 +static int init_inodecache(void);
 143 +static void destroy_inodecache(void);
 144 +static struct dentry *squashfs_lookup(struct inode *, struct dentry *,
 145 +                               struct nameidata *);
 146 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode);
 147 +static long long read_blocklist(struct inode *inode, int index,
 148 +                               int readahead_blks, char *block_list,
 149 +                               unsigned short **block_p, unsigned int *bsize);
 150 +static int squashfs_get_sb(struct file_system_type *, int,
 151 +                       const char *, void *, struct vfsmount *);
 152 +
 153 +
 154 +static z_stream stream;
 155 +
 156 +static struct file_system_type squashfs_fs_type = {
 157 +       .owner = THIS_MODULE,
 158 +       .name = "squashfs",
 159 +       .get_sb = squashfs_get_sb,
 160 +       .kill_sb = kill_block_super,
 161 +       .fs_flags = FS_REQUIRES_DEV
 162 +};
 163 +
 164 +static unsigned char squashfs_filetype_table[] = {
 165 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
 166 +};
 167 +
 168 +static struct super_operations squashfs_ops = {
 169 +       .alloc_inode = squashfs_alloc_inode,
 170 +       .destroy_inode = squashfs_destroy_inode,
 171 +       .statfs = squashfs_statfs,
 172 +       .put_super = squashfs_put_super,
 173 +};
 174 +
 175 +SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = {
 176 +       .readpage = squashfs_symlink_readpage
 177 +};
 178 +
 179 +SQSH_EXTERN struct address_space_operations squashfs_aops = {
 180 +       .readpage = squashfs_readpage
 181 +};
 182 +
 183 +SQSH_EXTERN struct address_space_operations squashfs_aops_4K = {
 184 +       .readpage = squashfs_readpage4K
 185 +};
 186 +
 187 +static struct file_operations squashfs_dir_ops = {
 188 +       .read = generic_read_dir,
 189 +       .readdir = squashfs_readdir
 190 +};
 191 +
 192 +SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = {
 193 +       .lookup = squashfs_lookup
 194 +};
 195 +
 196 +
 197 +static struct buffer_head *get_block_length(struct super_block *s,
 198 +                               int *cur_index, int *offset, int *c_byte)
 199 +{
 200 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 201 +       unsigned short temp;
 202 +       struct buffer_head *bh;
 203 +
 204 +       if (!(bh = sb_bread(s, *cur_index)))
 205 +               goto out;
 206 +
 207 +       if (msblk->devblksize - *offset == 1) {
 208 +               if (msblk->swap)
 209 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 210 +                               (bh->b_data + *offset));
 211 +               else
 212 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 213 +                               (bh->b_data + *offset));
 214 +               brelse(bh);
 215 +               if (!(bh = sb_bread(s, ++(*cur_index))))
 216 +                       goto out;
 217 +               if (msblk->swap)
 218 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 219 +                               bh->b_data);
 220 +               else
 221 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 222 +                               bh->b_data);
 223 +               *c_byte = temp;
 224 +               *offset = 1;
 225 +       } else {
 226 +               if (msblk->swap) {
 227 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 228 +                               (bh->b_data + *offset));
 229 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 230 +                               (bh->b_data + *offset + 1));
 231 +               } else {
 232 +                       ((unsigned char *) &temp)[0] = *((unsigned char *)
 233 +                               (bh->b_data + *offset));
 234 +                       ((unsigned char *) &temp)[1] = *((unsigned char *)
 235 +                               (bh->b_data + *offset + 1));
 236 +               }
 237 +               *c_byte = temp;
 238 +               *offset += 2;
 239 +       }
 240 +
 241 +       if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) {
 242 +               if (*offset == msblk->devblksize) {
 243 +                       brelse(bh);
 244 +                       if (!(bh = sb_bread(s, ++(*cur_index))))
 245 +                               goto out;
 246 +                       *offset = 0;
 247 +               }
 248 +               if (*((unsigned char *) (bh->b_data + *offset)) !=
 249 +                                               SQUASHFS_MARKER_BYTE) {
 250 +                       ERROR("Metadata block marker corrupt @ %x\n",
 251 +                                               *cur_index);
 252 +                       brelse(bh);
 253 +                       goto out;
 254 +               }
 255 +               (*offset)++;
 256 +       }
 257 +       return bh;
 258 +
 259 +out:
 260 +       return NULL;
 261 +}
 262 +
 263 +
 264 +SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer,
 265 +                       long long index, unsigned int length,
 266 +                       long long *next_index)
 267 +{
 268 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 269 +       struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
 270 +                       msblk->devblksize_log2) + 2];
 271 +       unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
 272 +       unsigned int cur_index = index >> msblk->devblksize_log2;
 273 +       int bytes, avail_bytes, b = 0, k;
 274 +       char *c_buffer;
 275 +       unsigned int compressed;
 276 +       unsigned int c_byte = length;
 277 +
 278 +       if (c_byte) {
 279 +               bytes = msblk->devblksize - offset;
 280 +               compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
 281 +               c_buffer = compressed ? msblk->read_data : buffer;
 282 +               c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
 283 +
 284 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 285 +                                       ? "" : "un", (unsigned int) c_byte);
 286 +
 287 +               if (!(bh[0] = sb_getblk(s, cur_index)))
 288 +                       goto block_release;
 289 +
 290 +               for (b = 1; bytes < c_byte; b++) {
 291 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 292 +                               goto block_release;
 293 +                       bytes += msblk->devblksize;
 294 +               }
 295 +               ll_rw_block(READ, b, bh);
 296 +       } else {
 297 +               if (!(bh[0] = get_block_length(s, &cur_index, &offset,
 298 +                                                               &c_byte)))
 299 +                       goto read_failure;
 300 +
 301 +               bytes = msblk->devblksize - offset;
 302 +               compressed = SQUASHFS_COMPRESSED(c_byte);
 303 +               c_buffer = compressed ? msblk->read_data : buffer;
 304 +               c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
 305 +
 306 +               TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
 307 +                                       ? "" : "un", (unsigned int) c_byte);
 308 +
 309 +               for (b = 1; bytes < c_byte; b++) {
 310 +                       if (!(bh[b] = sb_getblk(s, ++cur_index)))
 311 +                               goto block_release;
 312 +                       bytes += msblk->devblksize;
 313 +               }
 314 +               ll_rw_block(READ, b - 1, bh + 1);
 315 +       }
 316 +
 317 +       if (compressed)
 318 +               down(&msblk->read_data_mutex);
 319 +
 320 +       for (bytes = 0, k = 0; k < b; k++) {
 321 +               avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
 322 +                                       msblk->devblksize - offset :
 323 +                                       c_byte - bytes;
 324 +               wait_on_buffer(bh[k]);
 325 +               if (!buffer_uptodate(bh[k]))
 326 +                       goto block_release;
 327 +               memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
 328 +               bytes += avail_bytes;
 329 +               offset = 0;
 330 +               brelse(bh[k]);
 331 +       }
 332 +
 333 +       /*
 334 +        * uncompress block
 335 +        */
 336 +       if (compressed) {
 337 +               int zlib_err;
 338 +
 339 +               stream.next_in = c_buffer;
 340 +               stream.avail_in = c_byte;
 341 +               stream.next_out = buffer;
 342 +               stream.avail_out = msblk->read_size;
 343 +
 344 +               if (((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
 345 +                               ((zlib_err = zlib_inflate(&stream, Z_FINISH))
 346 +                                != Z_STREAM_END) || ((zlib_err =
 347 +                               zlib_inflateEnd(&stream)) != Z_OK)) {
 348 +                       ERROR("zlib_fs returned unexpected result 0x%x\n",
 349 +                               zlib_err);
 350 +                       bytes = 0;
 351 +               } else
 352 +                       bytes = stream.total_out;
 353 +
 354 +               up(&msblk->read_data_mutex);
 355 +       }
 356 +
 357 +       if (next_index)
 358 +               *next_index = index + c_byte + (length ? 0 :
 359 +                               (SQUASHFS_CHECK_DATA(msblk->sblk.flags)
 360 +                                ? 3 : 2));
 361 +       return bytes;
 362 +
 363 +block_release:
 364 +       while (--b >= 0)
 365 +               brelse(bh[b]);
 366 +
 367 +read_failure:
 368 +       ERROR("sb_bread failed reading block 0x%x\n", cur_index);
 369 +       return 0;
 370 +}
 371 +
 372 +
 373 +SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
 374 +                               long long block, unsigned int offset,
 375 +                               int length, long long *next_block,
 376 +                               unsigned int *next_offset)
 377 +{
 378 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 379 +       int n, i, bytes, return_length = length;
 380 +       long long next_index;
 381 +
 382 +       TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
 383 +
 384 +       while ( 1 ) {
 385 +               for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
 386 +                       if (msblk->block_cache[i].block == block)
 387 +                               break;
 388 +
 389 +               down(&msblk->block_cache_mutex);
 390 +
 391 +               if (i == SQUASHFS_CACHED_BLKS) {
 392 +                       /* read inode header block */
 393 +                       for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS;
 394 +                                       n ; n --, i = (i + 1) %
 395 +                                       SQUASHFS_CACHED_BLKS)
 396 +                               if (msblk->block_cache[i].block !=
 397 +                                                       SQUASHFS_USED_BLK)
 398 +                                       break;
 399 +
 400 +                       if (n == 0) {
 401 +                               wait_queue_t wait;
 402 +
 403 +                               init_waitqueue_entry(&wait, current);
 404 +                               add_wait_queue(&msblk->waitq, &wait);
 405 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 406 +                               up(&msblk->block_cache_mutex);
 407 +                               schedule();
 408 +                               set_current_state(TASK_RUNNING);
 409 +                               remove_wait_queue(&msblk->waitq, &wait);
 410 +                               continue;
 411 +                       }
 412 +                       msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
 413 +
 414 +                       if (msblk->block_cache[i].block ==
 415 +                                                       SQUASHFS_INVALID_BLK) {
 416 +                               if (!(msblk->block_cache[i].data =
 417 +                                               kmalloc(SQUASHFS_METADATA_SIZE,
 418 +                                               GFP_KERNEL))) {
 419 +                                       ERROR("Failed to allocate cache"
 420 +                                                       "block\n");
 421 +                                       up(&msblk->block_cache_mutex);
 422 +                                       goto out;
 423 +                               }
 424 +                       }
 425 +
 426 +                       msblk->block_cache[i].block = SQUASHFS_USED_BLK;
 427 +                       up(&msblk->block_cache_mutex);
 428 +
 429 +                       if (!(msblk->block_cache[i].length =
 430 +                                               squashfs_read_data(s,
 431 +                                               msblk->block_cache[i].data,
 432 +                                               block, 0, &next_index))) {
 433 +                               ERROR("Unable to read cache block [%llx:%x]\n",
 434 +                                               block, offset);
 435 +                               goto out;
 436 +                       }
 437 +
 438 +                       down(&msblk->block_cache_mutex);
 439 +                       wake_up(&msblk->waitq);
 440 +                       msblk->block_cache[i].block = block;
 441 +                       msblk->block_cache[i].next_index = next_index;
 442 +                       TRACE("Read cache block [%llx:%x]\n", block, offset);
 443 +               }
 444 +
 445 +               if (msblk->block_cache[i].block != block) {
 446 +                       up(&msblk->block_cache_mutex);
 447 +                       continue;
 448 +               }
 449 +
 450 +               if ((bytes = msblk->block_cache[i].length - offset) >= length) {
 451 +                       if (buffer)
 452 +                               memcpy(buffer, msblk->block_cache[i].data +
 453 +                                               offset, length);
 454 +                       if (msblk->block_cache[i].length - offset == length) {
 455 +                               *next_block = msblk->block_cache[i].next_index;
 456 +                               *next_offset = 0;
 457 +                       } else {
 458 +                               *next_block = block;
 459 +                               *next_offset = offset + length;
 460 +                       }
 461 +                       up(&msblk->block_cache_mutex);
 462 +                       goto finish;
 463 +               } else {
 464 +                       if (buffer) {
 465 +                               memcpy(buffer, msblk->block_cache[i].data +
 466 +                                               offset, bytes);
 467 +                               buffer += bytes;
 468 +                       }
 469 +                       block = msblk->block_cache[i].next_index;
 470 +                       up(&msblk->block_cache_mutex);
 471 +                       length -= bytes;
 472 +                       offset = 0;
 473 +               }
 474 +       }
 475 +
 476 +finish:
 477 +       return return_length;
 478 +out:
 479 +       return 0;
 480 +}
 481 +
 482 +
 483 +static int get_fragment_location(struct super_block *s, unsigned int fragment,
 484 +                               long long *fragment_start_block,
 485 +                               unsigned int *fragment_size)
 486 +{
 487 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 488 +       long long start_block =
 489 +               msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
 490 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
 491 +       struct squashfs_fragment_entry fragment_entry;
 492 +
 493 +       if (msblk->swap) {
 494 +               struct squashfs_fragment_entry sfragment_entry;
 495 +
 496 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
 497 +                                       start_block, offset,
 498 +                                       sizeof(sfragment_entry), &start_block,
 499 +                                       &offset))
 500 +                       goto out;
 501 +               SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
 502 +       } else
 503 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
 504 +                                       start_block, offset,
 505 +                                       sizeof(fragment_entry), &start_block,
 506 +                                       &offset))
 507 +                       goto out;
 508 +
 509 +       *fragment_start_block = fragment_entry.start_block;
 510 +       *fragment_size = fragment_entry.size;
 511 +
 512 +       return 1;
 513 +
 514 +out:
 515 +       return 0;
 516 +}
 517 +
 518 +
 519 +SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
 520 +                                       squashfs_fragment_cache *fragment)
 521 +{
 522 +       down(&msblk->fragment_mutex);
 523 +       fragment->locked --;
 524 +       wake_up(&msblk->fragment_wait_queue);
 525 +       up(&msblk->fragment_mutex);
 526 +}
 527 +
 528 +
 529 +SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
 530 +                                       *s, long long start_block,
 531 +                                       int length)
 532 +{
 533 +       int i, n;
 534 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 535 +
 536 +       while ( 1 ) {
 537 +               down(&msblk->fragment_mutex);
 538 +
 539 +               for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
 540 +                               msblk->fragment[i].block != start_block; i++);
 541 +
 542 +               if (i == SQUASHFS_CACHED_FRAGMENTS) {
 543 +                       for (i = msblk->next_fragment, n =
 544 +                               SQUASHFS_CACHED_FRAGMENTS; n &&
 545 +                               msblk->fragment[i].locked; n--, i = (i + 1) %
 546 +                               SQUASHFS_CACHED_FRAGMENTS);
 547 +
 548 +                       if (n == 0) {
 549 +                               wait_queue_t wait;
 550 +
 551 +                               init_waitqueue_entry(&wait, current);
 552 +                               add_wait_queue(&msblk->fragment_wait_queue,
 553 +                                                                       &wait);
 554 +                               set_current_state(TASK_UNINTERRUPTIBLE);
 555 +                               up(&msblk->fragment_mutex);
 556 +                               schedule();
 557 +                               set_current_state(TASK_RUNNING);
 558 +                               remove_wait_queue(&msblk->fragment_wait_queue,
 559 +                                                                       &wait);
 560 +                               continue;
 561 +                       }
 562 +                       msblk->next_fragment = (msblk->next_fragment + 1) %
 563 +                               SQUASHFS_CACHED_FRAGMENTS;
 564 +
 565 +                       if (msblk->fragment[i].data == NULL)
 566 +                               if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
 567 +                                               (SQUASHFS_FILE_MAX_SIZE))) {
 568 +                                       ERROR("Failed to allocate fragment "
 569 +                                                       "cache block\n");
 570 +                                       up(&msblk->fragment_mutex);
 571 +                                       goto out;
 572 +                               }
 573 +
 574 +                       msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
 575 +                       msblk->fragment[i].locked = 1;
 576 +                       up(&msblk->fragment_mutex);
 577 +
 578 +                       if (!(msblk->fragment[i].length = squashfs_read_data(s,
 579 +                                               msblk->fragment[i].data,
 580 +                                               start_block, length, NULL))) {
 581 +                               ERROR("Unable to read fragment cache block "
 582 +                                                       "[%llx]\n", start_block);
 583 +                               msblk->fragment[i].locked = 0;
 584 +                               goto out;
 585 +                       }
 586 +
 587 +                       msblk->fragment[i].block = start_block;
 588 +                       TRACE("New fragment %d, start block %lld, locked %d\n",
 589 +                                               i, msblk->fragment[i].block,
 590 +                                               msblk->fragment[i].locked);
 591 +                       break;
 592 +               }
 593 +
 594 +               msblk->fragment[i].locked++;
 595 +               up(&msblk->fragment_mutex);
 596 +               TRACE("Got fragment %d, start block %lld, locked %d\n", i,
 597 +                                               msblk->fragment[i].block,
 598 +                                               msblk->fragment[i].locked);
 599 +               break;
 600 +       }
 601 +
 602 +       return &msblk->fragment[i];
 603 +
 604 +out:
 605 +       return NULL;
 606 +}
 607 +
 608 +
 609 +static struct inode *squashfs_new_inode(struct super_block *s,
 610 +               struct squashfs_base_inode_header *inodeb)
 611 +{
 612 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 613 +       struct inode *i = new_inode(s);
 614 +
 615 +       if (i) {
 616 +               i->i_ino = inodeb->inode_number;
 617 +               i->i_mtime.tv_sec = inodeb->mtime;
 618 +               i->i_atime.tv_sec = inodeb->mtime;
 619 +               i->i_ctime.tv_sec = inodeb->mtime;
 620 +               i->i_uid = msblk->uid[inodeb->uid];
 621 +               i->i_mode = inodeb->mode;
 622 +               i->i_size = 0;
 623 +               if (inodeb->guid == SQUASHFS_GUIDS)
 624 +                       i->i_gid = i->i_uid;
 625 +               else
 626 +                       i->i_gid = msblk->guid[inodeb->guid];
 627 +       }
 628 +
 629 +       return i;
 630 +}
 631 +
 632 +
 633 +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode)
 634 +{
 635 +       struct inode *i;
 636 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 637 +       struct squashfs_super_block *sblk = &msblk->sblk;
 638 +       long long block = SQUASHFS_INODE_BLK(inode) +
 639 +               sblk->inode_table_start;
 640 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
 641 +       long long next_block;
 642 +       unsigned int next_offset;
 643 +       union squashfs_inode_header id, sid;
 644 +       struct squashfs_base_inode_header *inodeb = &id.base,
 645 +                                         *sinodeb = &sid.base;
 646 +
 647 +       TRACE("Entered squashfs_iget\n");
 648 +
 649 +       if (msblk->swap) {
 650 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
 651 +                                       offset, sizeof(*sinodeb), &next_block,
 652 +                                       &next_offset))
 653 +                       goto failed_read;
 654 +               SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb,
 655 +                                       sizeof(*sinodeb));
 656 +       } else
 657 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
 658 +                                       offset, sizeof(*inodeb), &next_block,
 659 +                                       &next_offset))
 660 +                       goto failed_read;
 661 +
 662 +       switch(inodeb->inode_type) {
 663 +               case SQUASHFS_FILE_TYPE: {
 664 +                       unsigned int frag_size;
 665 +                       long long frag_blk;
 666 +                       struct squashfs_reg_inode_header *inodep = &id.reg;
 667 +                       struct squashfs_reg_inode_header *sinodep = &sid.reg;
 668 +
 669 +                       if (msblk->swap) {
 670 +                               if (!squashfs_get_cached_block(s, (char *)
 671 +                                               sinodep, block, offset,
 672 +                                               sizeof(*sinodep), &next_block,
 673 +                                               &next_offset))
 674 +                                       goto failed_read;
 675 +                               SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep);
 676 +                       } else
 677 +                               if (!squashfs_get_cached_block(s, (char *)
 678 +                                               inodep, block, offset,
 679 +                                               sizeof(*inodep), &next_block,
 680 +                                               &next_offset))
 681 +                                       goto failed_read;
 682 +
 683 +                       frag_blk = SQUASHFS_INVALID_BLK;
 684 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 685 +                                       !get_fragment_location(s,
 686 +                                       inodep->fragment, &frag_blk, &frag_size))
 687 +                               goto failed_read;
 688 +
 689 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 690 +                               goto failed_read1;
 691 +
 692 +                       i->i_nlink = 1;
 693 +                       i->i_size = inodep->file_size;
 694 +                       i->i_fop = &generic_ro_fops;
 695 +                       i->i_mode |= S_IFREG;
 696 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 697 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 698 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 699 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 700 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 701 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 702 +                       SQUASHFS_I(i)->offset = next_offset;
 703 +                       if (sblk->block_size > 4096)
 704 +                               i->i_data.a_ops = &squashfs_aops;
 705 +                       else
 706 +                               i->i_data.a_ops = &squashfs_aops_4K;
 707 +
 708 +                       TRACE("File inode %x:%x, start_block %llx, "
 709 +                                       "block_list_start %llx, offset %x\n",
 710 +                                       SQUASHFS_INODE_BLK(inode), offset,
 711 +                                       inodep->start_block, next_block,
 712 +                                       next_offset);
 713 +                       break;
 714 +               }
 715 +               case SQUASHFS_LREG_TYPE: {
 716 +                       unsigned int frag_size;
 717 +                       long long frag_blk;
 718 +                       struct squashfs_lreg_inode_header *inodep = &id.lreg;
 719 +                       struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
 720 +
 721 +                       if (msblk->swap) {
 722 +                               if (!squashfs_get_cached_block(s, (char *)
 723 +                                               sinodep, block, offset,
 724 +                                               sizeof(*sinodep), &next_block,
 725 +                                               &next_offset))
 726 +                                       goto failed_read;
 727 +                               SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
 728 +                       } else
 729 +                               if (!squashfs_get_cached_block(s, (char *)
 730 +                                               inodep, block, offset,
 731 +                                               sizeof(*inodep), &next_block,
 732 +                                               &next_offset))
 733 +                                       goto failed_read;
 734 +
 735 +                       frag_blk = SQUASHFS_INVALID_BLK;
 736 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
 737 +                                       !get_fragment_location(s,
 738 +                                       inodep->fragment, &frag_blk, &frag_size))
 739 +                               goto failed_read;
 740 +
 741 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 742 +                               goto failed_read1;
 743 +
 744 +                       i->i_nlink = inodep->nlink;
 745 +                       i->i_size = inodep->file_size;
 746 +                       i->i_fop = &generic_ro_fops;
 747 +                       i->i_mode |= S_IFREG;
 748 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
 749 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
 750 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
 751 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
 752 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 753 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
 754 +                       SQUASHFS_I(i)->offset = next_offset;
 755 +                       if (sblk->block_size > 4096)
 756 +                               i->i_data.a_ops = &squashfs_aops;
 757 +                       else
 758 +                               i->i_data.a_ops = &squashfs_aops_4K;
 759 +
 760 +                       TRACE("File inode %x:%x, start_block %llx, "
 761 +                                       "block_list_start %llx, offset %x\n",
 762 +                                       SQUASHFS_INODE_BLK(inode), offset,
 763 +                                       inodep->start_block, next_block,
 764 +                                       next_offset);
 765 +                       break;
 766 +               }
 767 +               case SQUASHFS_DIR_TYPE: {
 768 +                       struct squashfs_dir_inode_header *inodep = &id.dir;
 769 +                       struct squashfs_dir_inode_header *sinodep = &sid.dir;
 770 +
 771 +                       if (msblk->swap) {
 772 +                               if (!squashfs_get_cached_block(s, (char *)
 773 +                                               sinodep, block, offset,
 774 +                                               sizeof(*sinodep), &next_block,
 775 +                                               &next_offset))
 776 +                                       goto failed_read;
 777 +                               SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep);
 778 +                       } else
 779 +                               if (!squashfs_get_cached_block(s, (char *)
 780 +                                               inodep, block, offset,
 781 +                                               sizeof(*inodep), &next_block,
 782 +                                               &next_offset))
 783 +                                       goto failed_read;
 784 +
 785 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 786 +                               goto failed_read1;
 787 +
 788 +                       i->i_nlink = inodep->nlink;
 789 +                       i->i_size = inodep->file_size;
 790 +                       i->i_op = &squashfs_dir_inode_ops;
 791 +                       i->i_fop = &squashfs_dir_ops;
 792 +                       i->i_mode |= S_IFDIR;
 793 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 794 +                       SQUASHFS_I(i)->offset = inodep->offset;
 795 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
 796 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 797 +
 798 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
 799 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
 800 +                                       offset, inodep->start_block,
 801 +                                       inodep->offset);
 802 +                       break;
 803 +               }
 804 +               case SQUASHFS_LDIR_TYPE: {
 805 +                       struct squashfs_ldir_inode_header *inodep = &id.ldir;
 806 +                       struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
 807 +
 808 +                       if (msblk->swap) {
 809 +                               if (!squashfs_get_cached_block(s, (char *)
 810 +                                               sinodep, block, offset,
 811 +                                               sizeof(*sinodep), &next_block,
 812 +                                               &next_offset))
 813 +                                       goto failed_read;
 814 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep,
 815 +                                               sinodep);
 816 +                       } else
 817 +                               if (!squashfs_get_cached_block(s, (char *)
 818 +                                               inodep, block, offset,
 819 +                                               sizeof(*inodep), &next_block,
 820 +                                               &next_offset))
 821 +                                       goto failed_read;
 822 +
 823 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 824 +                               goto failed_read1;
 825 +
 826 +                       i->i_nlink = inodep->nlink;
 827 +                       i->i_size = inodep->file_size;
 828 +                       i->i_op = &squashfs_dir_inode_ops;
 829 +                       i->i_fop = &squashfs_dir_ops;
 830 +                       i->i_mode |= S_IFDIR;
 831 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
 832 +                       SQUASHFS_I(i)->offset = inodep->offset;
 833 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
 834 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
 835 +                                                               next_offset;
 836 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
 837 +                                                               inodep->i_count;
 838 +                       SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
 839 +
 840 +                       TRACE("Long directory inode %x:%x, start_block %x, "
 841 +                                       "offset %x\n",
 842 +                                       SQUASHFS_INODE_BLK(inode), offset,
 843 +                                       inodep->start_block, inodep->offset);
 844 +                       break;
 845 +               }
 846 +               case SQUASHFS_SYMLINK_TYPE: {
 847 +                       struct squashfs_symlink_inode_header *inodep =
 848 +                                                               &id.symlink;
 849 +                       struct squashfs_symlink_inode_header *sinodep =
 850 +                                                               &sid.symlink;
 851 +
 852 +                       if (msblk->swap) {
 853 +                               if (!squashfs_get_cached_block(s, (char *)
 854 +                                               sinodep, block, offset,
 855 +                                               sizeof(*sinodep), &next_block,
 856 +                                               &next_offset))
 857 +                                       goto failed_read;
 858 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep,
 859 +                                                               sinodep);
 860 +                       } else
 861 +                               if (!squashfs_get_cached_block(s, (char *)
 862 +                                               inodep, block, offset,
 863 +                                               sizeof(*inodep), &next_block,
 864 +                                               &next_offset))
 865 +                                       goto failed_read;
 866 +
 867 +                       if((i = squashfs_new_inode(s, inodeb)) == NULL)
 868 +                               goto failed_read1;
 869 +
 870 +                       i->i_nlink = inodep->nlink;
 871 +                       i->i_size = inodep->symlink_size;
 872 +                       i->i_op = &page_symlink_inode_operations;
 873 +                       i->i_data.a_ops = &squashfs_symlink_aops;
 874 +                       i->i_mode |= S_IFLNK;
 875 +                       SQUASHFS_I(i)->start_block = next_block;
 876 +                       SQUASHFS_I(i)->offset = next_offset;
 877 +
 878 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
 879 +                                       "offset %x\n",
 880 +                                       SQUASHFS_INODE_BLK(inode), offset,
 881 +                                       next_block, next_offset);
 882 +                       break;
 883 +                }
 884 +                case SQUASHFS_BLKDEV_TYPE:
 885 +                case SQUASHFS_CHRDEV_TYPE: {
 886 +                       struct squashfs_dev_inode_header *inodep = &id.dev;
 887 +                       struct squashfs_dev_inode_header *sinodep = &sid.dev;
 888 +
 889 +                       if (msblk->swap) {
 890 +                               if (!squashfs_get_cached_block(s, (char *)
 891 +                                               sinodep, block, offset,
 892 +                                               sizeof(*sinodep), &next_block,
 893 +                                               &next_offset))
 894 +                                       goto failed_read;
 895 +                               SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep);
 896 +                       } else
 897 +                               if (!squashfs_get_cached_block(s, (char *)
 898 +                                               inodep, block, offset,
 899 +                                               sizeof(*inodep), &next_block,
 900 +                                               &next_offset))
 901 +                                       goto failed_read;
 902 +
 903 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 904 +                               goto failed_read1;
 905 +
 906 +                       i->i_nlink = inodep->nlink;
 907 +                       i->i_mode |= (inodeb->inode_type ==
 908 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
 909 +                                       S_IFBLK;
 910 +                       init_special_inode(i, i->i_mode,
 911 +                                       old_decode_dev(inodep->rdev));
 912 +
 913 +                       TRACE("Device inode %x:%x, rdev %x\n",
 914 +                                       SQUASHFS_INODE_BLK(inode), offset,
 915 +                                       inodep->rdev);
 916 +                       break;
 917 +                }
 918 +                case SQUASHFS_FIFO_TYPE:
 919 +                case SQUASHFS_SOCKET_TYPE: {
 920 +                       struct squashfs_ipc_inode_header *inodep = &id.ipc;
 921 +                       struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
 922 +
 923 +                       if (msblk->swap) {
 924 +                               if (!squashfs_get_cached_block(s, (char *)
 925 +                                               sinodep, block, offset,
 926 +                                               sizeof(*sinodep), &next_block,
 927 +                                               &next_offset))
 928 +                                       goto failed_read;
 929 +                               SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
 930 +                       } else
 931 +                               if (!squashfs_get_cached_block(s, (char *)
 932 +                                               inodep, block, offset,
 933 +                                               sizeof(*inodep), &next_block,
 934 +                                               &next_offset))
 935 +                                       goto failed_read;
 936 +
 937 +                       if ((i = squashfs_new_inode(s, inodeb)) == NULL)
 938 +                               goto failed_read1;
 939 +
 940 +                       i->i_nlink = inodep->nlink;
 941 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
 942 +                                                       ? S_IFIFO : S_IFSOCK;
 943 +                       init_special_inode(i, i->i_mode, 0);
 944 +                       break;
 945 +                }
 946 +                default:
 947 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
 948 +                                       inodeb->inode_type);
 949 +                       goto failed_read1;
 950 +       }
 951 +
 952 +       insert_inode_hash(i);
 953 +       return i;
 954 +
 955 +failed_read:
 956 +       ERROR("Unable to read inode [%llx:%x]\n", block, offset);
 957 +
 958 +failed_read1:
 959 +       return NULL;
 960 +}
 961 +
 962 +
 963 +static int read_fragment_index_table(struct super_block *s)
 964 +{
 965 +       struct squashfs_sb_info *msblk = s->s_fs_info;
 966 +       struct squashfs_super_block *sblk = &msblk->sblk;
 967 +
 968 +       /* Allocate fragment index table */
 969 +       if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES
 970 +                                       (sblk->fragments), GFP_KERNEL))) {
 971 +               ERROR("Failed to allocate uid/gid table\n");
 972 +               return 0;
 973 +       }
 974 +
 975 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) &&
 976 +                                       !squashfs_read_data(s, (char *)
 977 +                                       msblk->fragment_index,
 978 +                                       sblk->fragment_table_start,
 979 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES
 980 +                                       (sblk->fragments) |
 981 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
 982 +               ERROR("unable to read fragment index table\n");
 983 +               return 0;
 984 +       }
 985 +
 986 +       if (msblk->swap) {
 987 +               int i;
 988 +               long long fragment;
 989 +
 990 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments);
 991 +                                                                       i++) {
 992 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
 993 +                                               &msblk->fragment_index[i], 1);
 994 +                       msblk->fragment_index[i] = fragment;
 995 +               }
 996 +       }
 997 +
 998 +       return 1;
 999 +}
1000 +
1001 +
1002 +static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
1003 +{
1004 +       struct squashfs_super_block *sblk = &msblk->sblk;
1005 +
1006 +       msblk->iget = squashfs_iget;
1007 +       msblk->read_blocklist = read_blocklist;
1008 +       msblk->read_fragment_index_table = read_fragment_index_table;
1009 +
1010 +       if (sblk->s_major == 1) {
1011 +               if (!squashfs_1_0_supported(msblk)) {
1012 +                       SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
1013 +                               "are unsupported\n");
1014 +                       SERROR("Please recompile with "
1015 +                               "Squashfs 1.0 support enabled\n");
1016 +                       return 0;
1017 +               }
1018 +       } else if (sblk->s_major == 2) {
1019 +               if (!squashfs_2_0_supported(msblk)) {
1020 +                       SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
1021 +                               "are unsupported\n");
1022 +                       SERROR("Please recompile with "
1023 +                               "Squashfs 2.0 support enabled\n");
1024 +                       return 0;
1025 +               }
1026 +       } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor >
1027 +                       SQUASHFS_MINOR) {
1028 +               SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
1029 +                               "filesystem\n", sblk->s_major, sblk->s_minor);
1030 +               SERROR("Please update your kernel\n");
1031 +               return 0;
1032 +       }
1033 +
1034 +       return 1;
1035 +}
1036 +
1037 +
1038 +static int squashfs_fill_super(struct super_block *s, void *data, int silent)
1039 +{
1040 +       struct squashfs_sb_info *msblk;
1041 +       struct squashfs_super_block *sblk;
1042 +       int i;
1043 +       char b[BDEVNAME_SIZE];
1044 +       struct inode *root;
1045 +
1046 +       TRACE("Entered squashfs_read_superblock\n");
1047 +
1048 +       if (!(s->s_fs_info = kmalloc(sizeof(struct squashfs_sb_info),
1049 +                                               GFP_KERNEL))) {
1050 +               ERROR("Failed to allocate superblock\n");
1051 +               goto failure;
1052 +       }
1053 +       memset(s->s_fs_info, 0, sizeof(struct squashfs_sb_info));
1054 +       msblk = s->s_fs_info;
1055 +       sblk = &msblk->sblk;
1056 +
1057 +       msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
1058 +       msblk->devblksize_log2 = ffz(~msblk->devblksize);
1059 +
1060 +       init_MUTEX(&msblk->read_data_mutex);
1061 +       init_MUTEX(&msblk->read_page_mutex);
1062 +       init_MUTEX(&msblk->block_cache_mutex);
1063 +       init_MUTEX(&msblk->fragment_mutex);
1064 +       init_MUTEX(&msblk->meta_index_mutex);
1065 +
1066 +       init_waitqueue_head(&msblk->waitq);
1067 +       init_waitqueue_head(&msblk->fragment_wait_queue);
1068 +
1069 +       if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
1070 +                                       sizeof(struct squashfs_super_block) |
1071 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1072 +               SERROR("unable to read superblock\n");
1073 +               goto failed_mount;
1074 +       }
1075 +
1076 +       /* Check it is a SQUASHFS superblock */
1077 +       msblk->swap = 0;
1078 +       if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
1079 +               if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) {
1080 +                       struct squashfs_super_block ssblk;
1081 +
1082 +                       WARNING("Mounting a different endian SQUASHFS "
1083 +                               "filesystem on %s\n", bdevname(s->s_bdev, b));
1084 +
1085 +                       SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
1086 +                       memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
1087 +                       msblk->swap = 1;
1088 +               } else  {
1089 +                       SERROR("Can't find a SQUASHFS superblock on %s\n",
1090 +                                                       bdevname(s->s_bdev, b));
1091 +                       goto failed_mount;
1092 +               }
1093 +       }
1094 +
1095 +       /* Check the MAJOR & MINOR versions */
1096 +       if(!supported_squashfs_filesystem(msblk, silent))
1097 +               goto failed_mount;
1098 +
1099 +       TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
1100 +       TRACE("Inodes are %scompressed\n",
1101 +                                       SQUASHFS_UNCOMPRESSED_INODES
1102 +                                       (sblk->flags) ? "un" : "");
1103 +       TRACE("Data is %scompressed\n",
1104 +                                       SQUASHFS_UNCOMPRESSED_DATA(sblk->flags)
1105 +                                       ? "un" : "");
1106 +       TRACE("Check data is %s present in the filesystem\n",
1107 +                                       SQUASHFS_CHECK_DATA(sblk->flags) ?
1108 +                                       "" : "not");
1109 +       TRACE("Filesystem size %lld bytes\n", sblk->bytes_used);
1110 +       TRACE("Block size %d\n", sblk->block_size);
1111 +       TRACE("Number of inodes %d\n", sblk->inodes);
1112 +       if (sblk->s_major > 1)
1113 +               TRACE("Number of fragments %d\n", sblk->fragments);
1114 +       TRACE("Number of uids %d\n", sblk->no_uids);
1115 +       TRACE("Number of gids %d\n", sblk->no_guids);
1116 +       TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
1117 +       TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
1118 +       if (sblk->s_major > 1)
1119 +               TRACE("sblk->fragment_table_start %llx\n",
1120 +                                       sblk->fragment_table_start);
1121 +       TRACE("sblk->uid_start %llx\n", sblk->uid_start);
1122 +
1123 +       s->s_flags |= MS_RDONLY;
1124 +       s->s_op = &squashfs_ops;
1125 +
1126 +       /* Init inode_table block pointer array */
1127 +       if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) *
1128 +                                       SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
1129 +               ERROR("Failed to allocate block cache\n");
1130 +               goto failed_mount;
1131 +       }
1132 +
1133 +       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
1134 +               msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
1135 +
1136 +       msblk->next_cache = 0;
1137 +
1138 +       /* Allocate read_data block */
1139 +       msblk->read_size = (sblk->block_size < SQUASHFS_METADATA_SIZE) ?
1140 +                                       SQUASHFS_METADATA_SIZE :
1141 +                                       sblk->block_size;
1142 +
1143 +       if (!(msblk->read_data = kmalloc(msblk->read_size, GFP_KERNEL))) {
1144 +               ERROR("Failed to allocate read_data block\n");
1145 +               goto failed_mount;
1146 +       }
1147 +
1148 +       /* Allocate read_page block */
1149 +       if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
1150 +               ERROR("Failed to allocate read_page block\n");
1151 +               goto failed_mount;
1152 +       }
1153 +
1154 +       /* Allocate uid and gid tables */
1155 +       if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
1156 +                                       sizeof(unsigned int), GFP_KERNEL))) {
1157 +               ERROR("Failed to allocate uid/gid table\n");
1158 +               goto failed_mount;
1159 +       }
1160 +       msblk->guid = msblk->uid + sblk->no_uids;
1161 +
1162 +       if (msblk->swap) {
1163 +               unsigned int suid[sblk->no_uids + sblk->no_guids];
1164 +
1165 +               if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
1166 +                                       ((sblk->no_uids + sblk->no_guids) *
1167 +                                        sizeof(unsigned int)) |
1168 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1169 +                       ERROR("unable to read uid/gid table\n");
1170 +                       goto failed_mount;
1171 +               }
1172 +
1173 +               SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
1174 +                       sblk->no_guids), (sizeof(unsigned int) * 8));
1175 +       } else
1176 +               if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
1177 +                                       ((sblk->no_uids + sblk->no_guids) *
1178 +                                        sizeof(unsigned int)) |
1179 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
1180 +                       ERROR("unable to read uid/gid table\n");
1181 +                       goto failed_mount;
1182 +               }
1183 +
1184 +
1185 +       if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
1186 +               goto allocate_root;
1187 +
1188 +       if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
1189 +                               SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
1190 +               ERROR("Failed to allocate fragment block cache\n");
1191 +               goto failed_mount;
1192 +       }
1193 +
1194 +       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
1195 +               msblk->fragment[i].locked = 0;
1196 +               msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
1197 +               msblk->fragment[i].data = NULL;
1198 +       }
1199 +
1200 +       msblk->next_fragment = 0;
1201 +
1202 +       /* Allocate fragment index table */
1203 +       if (msblk->read_fragment_index_table(s) == 0)
1204 +               goto failed_mount;
1205 +
1206 +allocate_root:
1207 +       if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL)
1208 +               goto failed_mount;
1209 +
1210 +       if ((s->s_root = d_alloc_root(root)) == NULL) {
1211 +               ERROR("Root inode create failed\n");
1212 +               iput(root);
1213 +               goto failed_mount;
1214 +       }
1215 +
1216 +       TRACE("Leaving squashfs_read_super\n");
1217 +       return 0;
1218 +
1219 +failed_mount:
1220 +       kfree(msblk->fragment_index);
1221 +       kfree(msblk->fragment);
1222 +       kfree(msblk->uid);
1223 +       kfree(msblk->read_page);
1224 +       kfree(msblk->read_data);
1225 +       kfree(msblk->block_cache);
1226 +       kfree(msblk->fragment_index_2);
1227 +       kfree(s->s_fs_info);
1228 +       s->s_fs_info = NULL;
1229 +       return -EINVAL;
1230 +
1231 +failure:
1232 +       return -ENOMEM;
1233 +}
1234 +
1235 +
1236 +static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1237 +{
1238 +       struct squashfs_sb_info *msblk = dentry->d_inode->i_sb->s_fs_info;
1239 +       struct squashfs_super_block *sblk = &msblk->sblk;
1240 +
1241 +       TRACE("Entered squashfs_statfs\n");
1242 +
1243 +       buf->f_type = SQUASHFS_MAGIC;
1244 +       buf->f_bsize = sblk->block_size;
1245 +       buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1;
1246 +       buf->f_bfree = buf->f_bavail = 0;
1247 +       buf->f_files = sblk->inodes;
1248 +       buf->f_ffree = 0;
1249 +       buf->f_namelen = SQUASHFS_NAME_LEN;
1250 +
1251 +       return 0;
1252 +}
1253 +
1254 +
1255 +static int squashfs_symlink_readpage(struct file *file, struct page *page)
1256 +{
1257 +       struct inode *inode = page->mapping->host;
1258 +       int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
1259 +       long long block = SQUASHFS_I(inode)->start_block;
1260 +       int offset = SQUASHFS_I(inode)->offset;
1261 +       void *pageaddr = kmap(page);
1262 +
1263 +       TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
1264 +                               "%llx, offset %x\n", page->index,
1265 +                               SQUASHFS_I(inode)->start_block,
1266 +                               SQUASHFS_I(inode)->offset);
1267 +
1268 +       for (length = 0; length < index; length += bytes) {
1269 +               if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
1270 +                               block, offset, PAGE_CACHE_SIZE, &block,
1271 +                               &offset))) {
1272 +                       ERROR("Unable to read symbolic link [%llx:%x]\n", block,
1273 +                                       offset);
1274 +                       goto skip_read;
1275 +               }
1276 +       }
1277 +
1278 +       if (length != index) {
1279 +               ERROR("(squashfs_symlink_readpage) length != index\n");
1280 +               bytes = 0;
1281 +               goto skip_read;
1282 +       }
1283 +
1284 +       bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
1285 +                                       i_size_read(inode) - length;
1286 +
1287 +       if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
1288 +                                       offset, bytes, &block, &offset)))
1289 +               ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
1290 +
1291 +skip_read:
1292 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1293 +       kunmap(page);
1294 +       SetPageUptodate(page);
1295 +       unlock_page(page);
1296 +
1297 +       return 0;
1298 +}
1299 +
1300 +
1301 +struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
1302 +{
1303 +       struct meta_index *meta = NULL;
1304 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1305 +       int i;
1306 +
1307 +       down(&msblk->meta_index_mutex);
1308 +
1309 +       TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
1310 +
1311 +       if(msblk->meta_index == NULL)
1312 +               goto not_allocated;
1313 +
1314 +       for (i = 0; i < SQUASHFS_META_NUMBER; i ++)
1315 +               if (msblk->meta_index[i].inode_number == inode->i_ino &&
1316 +                               msblk->meta_index[i].offset >= offset &&
1317 +                               msblk->meta_index[i].offset <= index &&
1318 +                               msblk->meta_index[i].locked == 0) {
1319 +                       TRACE("locate_meta_index: entry %d, offset %d\n", i,
1320 +                                       msblk->meta_index[i].offset);
1321 +                       meta = &msblk->meta_index[i];
1322 +                       offset = meta->offset;
1323 +               }
1324 +
1325 +       if (meta)
1326 +               meta->locked = 1;
1327 +
1328 +not_allocated:
1329 +       up(&msblk->meta_index_mutex);
1330 +
1331 +       return meta;
1332 +}
1333 +
1334 +
1335 +struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
1336 +{
1337 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1338 +       struct meta_index *meta = NULL;
1339 +       int i;
1340 +
1341 +       down(&msblk->meta_index_mutex);
1342 +
1343 +       TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
1344 +
1345 +       if(msblk->meta_index == NULL) {
1346 +               if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
1347 +                                       SQUASHFS_META_NUMBER, GFP_KERNEL))) {
1348 +                       ERROR("Failed to allocate meta_index\n");
1349 +                       goto failed;
1350 +               }
1351 +               for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
1352 +                       msblk->meta_index[i].inode_number = 0;
1353 +                       msblk->meta_index[i].locked = 0;
1354 +               }
1355 +               msblk->next_meta_index = 0;
1356 +       }
1357 +
1358 +       for(i = SQUASHFS_META_NUMBER; i &&
1359 +                       msblk->meta_index[msblk->next_meta_index].locked; i --)
1360 +               msblk->next_meta_index = (msblk->next_meta_index + 1) %
1361 +                       SQUASHFS_META_NUMBER;
1362 +
1363 +       if(i == 0) {
1364 +               TRACE("empty_meta_index: failed!\n");
1365 +               goto failed;
1366 +       }
1367 +
1368 +       TRACE("empty_meta_index: returned meta entry %d, %p\n",
1369 +                       msblk->next_meta_index,
1370 +                       &msblk->meta_index[msblk->next_meta_index]);
1371 +
1372 +       meta = &msblk->meta_index[msblk->next_meta_index];
1373 +       msblk->next_meta_index = (msblk->next_meta_index + 1) %
1374 +                       SQUASHFS_META_NUMBER;
1375 +
1376 +       meta->inode_number = inode->i_ino;
1377 +       meta->offset = offset;
1378 +       meta->skip = skip;
1379 +       meta->entries = 0;
1380 +       meta->locked = 1;
1381 +
1382 +failed:
1383 +       up(&msblk->meta_index_mutex);
1384 +       return meta;
1385 +}
1386 +
1387 +
1388 +void release_meta_index(struct inode *inode, struct meta_index *meta)
1389 +{
1390 +       meta->locked = 0;
1391 +}
1392 +
1393 +
1394 +static int read_block_index(struct super_block *s, int blocks, char *block_list,
1395 +               long long *start_block, int *offset)
1396 +{
1397 +       struct squashfs_sb_info *msblk = s->s_fs_info;
1398 +       unsigned int *block_listp;
1399 +       int block = 0;
1400 +
1401 +       if (msblk->swap) {
1402 +               char sblock_list[blocks << 2];
1403 +
1404 +               if (!squashfs_get_cached_block(s, sblock_list, *start_block,
1405 +                               *offset, blocks << 2, start_block, offset)) {
1406 +                       ERROR("Unable to read block list [%llx:%x]\n",
1407 +                               *start_block, *offset);
1408 +                       goto failure;
1409 +               }
1410 +               SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
1411 +                               ((unsigned int *)sblock_list), blocks);
1412 +       } else
1413 +               if (!squashfs_get_cached_block(s, block_list, *start_block,
1414 +                               *offset, blocks << 2, start_block, offset)) {
1415 +                       ERROR("Unable to read block list [%llx:%x]\n",
1416 +                               *start_block, *offset);
1417 +                       goto failure;
1418 +               }
1419 +
1420 +       for (block_listp = (unsigned int *) block_list; blocks;
1421 +                               block_listp++, blocks --)
1422 +               block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
1423 +
1424 +       return block;
1425 +
1426 +failure:
1427 +       return -1;
1428 +}
1429 +
1430 +
1431 +#define SIZE 256
1432 +
1433 +static inline int calculate_skip(int blocks) {
1434 +       int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES);
1435 +       return skip >= 7 ? 7 : skip + 1;
1436 +}
1437 +
1438 +
1439 +static int get_meta_index(struct inode *inode, int index,
1440 +               long long *index_block, int *index_offset,
1441 +               long long *data_block, char *block_list)
1442 +{
1443 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1444 +       struct squashfs_super_block *sblk = &msblk->sblk;
1445 +       int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
1446 +       int offset = 0;
1447 +       struct meta_index *meta;
1448 +       struct meta_entry *meta_entry;
1449 +       long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
1450 +       int cur_offset = SQUASHFS_I(inode)->offset;
1451 +       long long cur_data_block = SQUASHFS_I(inode)->start_block;
1452 +       int i;
1453 +
1454 +       index /= SQUASHFS_META_INDEXES * skip;
1455 +
1456 +       while ( offset < index ) {
1457 +               meta = locate_meta_index(inode, index, offset + 1);
1458 +
1459 +               if (meta == NULL) {
1460 +                       if ((meta = empty_meta_index(inode, offset + 1,
1461 +                                                       skip)) == NULL)
1462 +                               goto all_done;
1463 +               } else {
1464 +                       offset = index < meta->offset + meta->entries ? index :
1465 +                               meta->offset + meta->entries - 1;
1466 +                       meta_entry = &meta->meta_entry[offset - meta->offset];
1467 +                       cur_index_block = meta_entry->index_block + sblk->inode_table_start;
1468 +                       cur_offset = meta_entry->offset;
1469 +                       cur_data_block = meta_entry->data_block;
1470 +                       TRACE("get_meta_index: offset %d, meta->offset %d, "
1471 +                               "meta->entries %d\n", offset, meta->offset,
1472 +                               meta->entries);
1473 +                       TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
1474 +                               " data_block 0x%llx\n", cur_index_block,
1475 +                               cur_offset, cur_data_block);
1476 +               }
1477 +
1478 +               for (i = meta->offset + meta->entries; i <= index &&
1479 +                               i < meta->offset + SQUASHFS_META_ENTRIES; i++) {
1480 +                       int blocks = skip * SQUASHFS_META_INDEXES;
1481 +
1482 +                       while (blocks) {
1483 +                               int block = blocks > (SIZE >> 2) ? (SIZE >> 2) :
1484 +                                       blocks;
1485 +                               int res = read_block_index(inode->i_sb, block,
1486 +                                       block_list, &cur_index_block,
1487 +                                       &cur_offset);
1488 +
1489 +                               if (res == -1)
1490 +                                       goto failed;
1491 +
1492 +                               cur_data_block += res;
1493 +                               blocks -= block;
1494 +                       }
1495 +
1496 +                       meta_entry = &meta->meta_entry[i - meta->offset];
1497 +                       meta_entry->index_block = cur_index_block - sblk->inode_table_start;
1498 +                       meta_entry->offset = cur_offset;
1499 +                       meta_entry->data_block = cur_data_block;
1500 +                       meta->entries ++;
1501 +                       offset ++;
1502 +               }
1503 +
1504 +               TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
1505 +                               meta->offset, meta->entries);
1506 +
1507 +               release_meta_index(inode, meta);
1508 +       }
1509 +
1510 +all_done:
1511 +       *index_block = cur_index_block;
1512 +       *index_offset = cur_offset;
1513 +       *data_block = cur_data_block;
1514 +
1515 +       return offset * SQUASHFS_META_INDEXES * skip;
1516 +
1517 +failed:
1518 +       release_meta_index(inode, meta);
1519 +       return -1;
1520 +}
1521 +
1522 +
1523 +static long long read_blocklist(struct inode *inode, int index,
1524 +                               int readahead_blks, char *block_list,
1525 +                               unsigned short **block_p, unsigned int *bsize)
1526 +{
1527 +       long long block_ptr;
1528 +       int offset;
1529 +       long long block;
1530 +       int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
1531 +               block_list);
1532 +
1533 +       TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
1534 +                      " 0x%x, block 0x%llx\n", res, index, block_ptr, offset,
1535 +                      block);
1536 +
1537 +       if(res == -1)
1538 +               goto failure;
1539 +
1540 +       index -= res;
1541 +
1542 +       while ( index ) {
1543 +               int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
1544 +               int res = read_block_index(inode->i_sb, blocks, block_list,
1545 +                       &block_ptr, &offset);
1546 +               if (res == -1)
1547 +                       goto failure;
1548 +               block += res;
1549 +               index -= blocks;
1550 +       }
1551 +
1552 +       if (read_block_index(inode->i_sb, 1, block_list,
1553 +                       &block_ptr, &offset) == -1)
1554 +               goto failure;
1555 +       *bsize = *((unsigned int *) block_list);
1556 +
1557 +       return block;
1558 +
1559 +failure:
1560 +       return 0;
1561 +}
1562 +
1563 +
1564 +static int squashfs_readpage(struct file *file, struct page *page)
1565 +{
1566 +       struct inode *inode = page->mapping->host;
1567 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1568 +       struct squashfs_super_block *sblk = &msblk->sblk;
1569 +       unsigned char block_list[SIZE];
1570 +       long long block;
1571 +       unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
1572 +       int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
1573 +       void *pageaddr;
1574 +       struct squashfs_fragment_cache *fragment = NULL;
1575 +       char *data_ptr = msblk->read_page;
1576 +
1577 +       int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
1578 +       int start_index = page->index & ~mask;
1579 +       int end_index = start_index | mask;
1580 +
1581 +       TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
1582 +                                       page->index,
1583 +                                       SQUASHFS_I(inode)->start_block);
1584 +
1585 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1586 +                                       PAGE_CACHE_SHIFT))
1587 +               goto skip_read;
1588 +
1589 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1590 +                                       || index < (i_size_read(inode) >>
1591 +                                       sblk->block_log)) {
1592 +               if ((block = (msblk->read_blocklist)(inode, index, 1,
1593 +                                       block_list, NULL, &bsize)) == 0)
1594 +                       goto skip_read;
1595 +
1596 +               down(&msblk->read_page_mutex);
1597 +
1598 +               if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
1599 +                                       block, bsize, NULL))) {
1600 +                       ERROR("Unable to read page, block %llx, size %x\n", block,
1601 +                                       bsize);
1602 +                       up(&msblk->read_page_mutex);
1603 +                       goto skip_read;
1604 +               }
1605 +       } else {
1606 +               if ((fragment = get_cached_fragment(inode->i_sb,
1607 +                                       SQUASHFS_I(inode)->
1608 +                                       u.s1.fragment_start_block,
1609 +                                       SQUASHFS_I(inode)->u.s1.fragment_size))
1610 +                                       == NULL) {
1611 +                       ERROR("Unable to read page, block %llx, size %x\n",
1612 +                                       SQUASHFS_I(inode)->
1613 +                                       u.s1.fragment_start_block,
1614 +                                       (int) SQUASHFS_I(inode)->
1615 +                                       u.s1.fragment_size);
1616 +                       goto skip_read;
1617 +               }
1618 +               bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
1619 +                                       (i_size_read(inode) & (sblk->block_size
1620 +                                       - 1));
1621 +               byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
1622 +               data_ptr = fragment->data;
1623 +       }
1624 +
1625 +       for (i = start_index; i <= end_index && byte_offset < bytes;
1626 +                                       i++, byte_offset += PAGE_CACHE_SIZE) {
1627 +               struct page *push_page;
1628 +               int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ?
1629 +                                       PAGE_CACHE_SIZE : bytes - byte_offset;
1630 +
1631 +               TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n",
1632 +                                       bytes, i, byte_offset, available_bytes);
1633 +
1634 +               if (i == page->index)  {
1635 +                       pageaddr = kmap_atomic(page, KM_USER0);
1636 +                       memcpy(pageaddr, data_ptr + byte_offset,
1637 +                                       available_bytes);
1638 +                       memset(pageaddr + available_bytes, 0,
1639 +                                       PAGE_CACHE_SIZE - available_bytes);
1640 +                       kunmap_atomic(pageaddr, KM_USER0);
1641 +                       flush_dcache_page(page);
1642 +                       SetPageUptodate(page);
1643 +                       unlock_page(page);
1644 +               } else if ((push_page =
1645 +                               grab_cache_page_nowait(page->mapping, i))) {
1646 +                       pageaddr = kmap_atomic(push_page, KM_USER0);
1647 +
1648 +                       memcpy(pageaddr, data_ptr + byte_offset,
1649 +                                       available_bytes);
1650 +                       memset(pageaddr + available_bytes, 0,
1651 +                                       PAGE_CACHE_SIZE - available_bytes);
1652 +                       kunmap_atomic(pageaddr, KM_USER0);
1653 +                       flush_dcache_page(push_page);
1654 +                       SetPageUptodate(push_page);
1655 +                       unlock_page(push_page);
1656 +                       page_cache_release(push_page);
1657 +               }
1658 +       }
1659 +
1660 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1661 +                                       || index < (i_size_read(inode) >>
1662 +                                       sblk->block_log))
1663 +               up(&msblk->read_page_mutex);
1664 +       else
1665 +               release_cached_fragment(msblk, fragment);
1666 +
1667 +       return 0;
1668 +
1669 +skip_read:
1670 +       pageaddr = kmap_atomic(page, KM_USER0);
1671 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1672 +       kunmap_atomic(pageaddr, KM_USER0);
1673 +       flush_dcache_page(page);
1674 +       SetPageUptodate(page);
1675 +       unlock_page(page);
1676 +
1677 +       return 0;
1678 +}
1679 +
1680 +
1681 +static int squashfs_readpage4K(struct file *file, struct page *page)
1682 +{
1683 +       struct inode *inode = page->mapping->host;
1684 +       struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
1685 +       struct squashfs_super_block *sblk = &msblk->sblk;
1686 +       unsigned char block_list[SIZE];
1687 +       long long block;
1688 +       unsigned int bsize, bytes = 0;
1689 +       void *pageaddr;
1690 +
1691 +       TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
1692 +                                       page->index,
1693 +                                       SQUASHFS_I(inode)->start_block);
1694 +
1695 +       if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1696 +                                       PAGE_CACHE_SHIFT)) {
1697 +               pageaddr = kmap_atomic(page, KM_USER0);
1698 +               goto skip_read;
1699 +       }
1700 +
1701 +       if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
1702 +                                       || page->index < (i_size_read(inode) >>
1703 +                                       sblk->block_log)) {
1704 +               block = (msblk->read_blocklist)(inode, page->index, 1,
1705 +                                       block_list, NULL, &bsize);
1706 +
1707 +               down(&msblk->read_page_mutex);
1708 +               bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
1709 +                                       bsize, NULL);
1710 +               pageaddr = kmap_atomic(page, KM_USER0);
1711 +               if (bytes)
1712 +                       memcpy(pageaddr, msblk->read_page, bytes);
1713 +               else
1714 +                       ERROR("Unable to read page, block %llx, size %x\n",
1715 +                                       block, bsize);
1716 +               up(&msblk->read_page_mutex);
1717 +       } else {
1718 +               struct squashfs_fragment_cache *fragment =
1719 +                       get_cached_fragment(inode->i_sb,
1720 +                                       SQUASHFS_I(inode)->
1721 +                                       u.s1.fragment_start_block,
1722 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1723 +               pageaddr = kmap_atomic(page, KM_USER0);
1724 +               if (fragment) {
1725 +                       bytes = i_size_read(inode) & (sblk->block_size - 1);
1726 +                       memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
1727 +                                       u.s1.fragment_offset, bytes);
1728 +                       release_cached_fragment(msblk, fragment);
1729 +               } else
1730 +                       ERROR("Unable to read page, block %llx, size %x\n",
1731 +                                       SQUASHFS_I(inode)->
1732 +                                       u.s1.fragment_start_block, (int)
1733 +                                       SQUASHFS_I(inode)-> u.s1.fragment_size);
1734 +       }
1735 +
1736 +skip_read:
1737 +       memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
1738 +       kunmap_atomic(pageaddr, KM_USER0);
1739 +       flush_dcache_page(page);
1740 +       SetPageUptodate(page);
1741 +       unlock_page(page);
1742 +
1743 +       return 0;
1744 +}
1745 +
1746 +
1747 +static int get_dir_index_using_offset(struct super_block *s, long long
1748 +                               *next_block, unsigned int *next_offset,
1749 +                               long long index_start,
1750 +                               unsigned int index_offset, int i_count,
1751 +                               long long f_pos)
1752 +{
1753 +       struct squashfs_sb_info *msblk = s->s_fs_info;
1754 +       struct squashfs_super_block *sblk = &msblk->sblk;
1755 +       int i, length = 0;
1756 +       struct squashfs_dir_index index;
1757 +
1758 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
1759 +                                       i_count, (unsigned int) f_pos);
1760 +
1761 +       f_pos =- 3;
1762 +       if (f_pos == 0)
1763 +               goto finish;
1764 +
1765 +       for (i = 0; i < i_count; i++) {
1766 +               if (msblk->swap) {
1767 +                       struct squashfs_dir_index sindex;
1768 +                       squashfs_get_cached_block(s, (char *) &sindex,
1769 +                                       index_start, index_offset,
1770 +                                       sizeof(sindex), &index_start,
1771 +                                       &index_offset);
1772 +                       SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
1773 +               } else
1774 +                       squashfs_get_cached_block(s, (char *) &index,
1775 +                                       index_start, index_offset,
1776 +                                       sizeof(index), &index_start,
1777 +                                       &index_offset);
1778 +
1779 +               if (index.index > f_pos)
1780 +                       break;
1781 +
1782 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
1783 +                                       index.size + 1, &index_start,
1784 +                                       &index_offset);
1785 +
1786 +               length = index.index;
1787 +               *next_block = index.start_block + sblk->directory_table_start;
1788 +       }
1789 +
1790 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1791 +
1792 +finish:
1793 +       return length + 3;
1794 +}
1795 +
1796 +
1797 +static int get_dir_index_using_name(struct super_block *s, long long
1798 +                               *next_block, unsigned int *next_offset,
1799 +                               long long index_start,
1800 +                               unsigned int index_offset, int i_count,
1801 +                               const char *name, int size)
1802 +{
1803 +       struct squashfs_sb_info *msblk = s->s_fs_info;
1804 +       struct squashfs_super_block *sblk = &msblk->sblk;
1805 +       int i, length = 0;
1806 +       char buffer[sizeof(struct squashfs_dir_index) + SQUASHFS_NAME_LEN + 1];
1807 +       struct squashfs_dir_index *index = (struct squashfs_dir_index *) buffer;
1808 +       char str[SQUASHFS_NAME_LEN + 1];
1809 +
1810 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
1811 +
1812 +       strncpy(str, name, size);
1813 +       str[size] = '\0';
1814 +
1815 +       for (i = 0; i < i_count; i++) {
1816 +               if (msblk->swap) {
1817 +                       struct squashfs_dir_index sindex;
1818 +                       squashfs_get_cached_block(s, (char *) &sindex,
1819 +                                       index_start, index_offset,
1820 +                                       sizeof(sindex), &index_start,
1821 +                                       &index_offset);
1822 +                       SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
1823 +               } else
1824 +                       squashfs_get_cached_block(s, (char *) index,
1825 +                                       index_start, index_offset,
1826 +                                       sizeof(struct squashfs_dir_index),
1827 +                                       &index_start, &index_offset);
1828 +
1829 +               squashfs_get_cached_block(s, index->name, index_start,
1830 +                                       index_offset, index->size + 1,
1831 +                                       &index_start, &index_offset);
1832 +
1833 +               index->name[index->size + 1] = '\0';
1834 +
1835 +               if (strcmp(index->name, str) > 0)
1836 +                       break;
1837 +
1838 +               length = index->index;
1839 +               *next_block = index->start_block + sblk->directory_table_start;
1840 +       }
1841 +
1842 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
1843 +       return length + 3;
1844 +}
1845 +
1846 +
1847 +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
1848 +{
1849 +       struct inode *i = file->f_dentry->d_inode;
1850 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
1851 +       struct squashfs_super_block *sblk = &msblk->sblk;
1852 +       long long next_block = SQUASHFS_I(i)->start_block +
1853 +               sblk->directory_table_start;
1854 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
1855 +               dir_count;
1856 +       struct squashfs_dir_header dirh;
1857 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
1858 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1859 +
1860 +       TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
1861 +
1862 +       while(file->f_pos < 3) {
1863 +               char *name;
1864 +               int size, i_ino;
1865 +
1866 +               if(file->f_pos == 0) {
1867 +                       name = ".";
1868 +                       size = 1;
1869 +                       i_ino = i->i_ino;
1870 +               } else {
1871 +                       name = "..";
1872 +                       size = 2;
1873 +                       i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
1874 +               }
1875 +               TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
1876 +                               (unsigned int) dirent, name, size, (int)
1877 +                               file->f_pos, i_ino,
1878 +                               squashfs_filetype_table[1]);
1879 +
1880 +               if (filldir(dirent, name, size,
1881 +                               file->f_pos, i_ino,
1882 +                               squashfs_filetype_table[1]) < 0) {
1883 +                               TRACE("Filldir returned less than 0\n");
1884 +                               goto finish;
1885 +               }
1886 +               file->f_pos += size;
1887 +               dirs_read++;
1888 +       }
1889 +
1890 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
1891 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
1892 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
1893 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
1894 +                               file->f_pos);
1895 +
1896 +       while (length < i_size_read(i)) {
1897 +               /* read directory header */
1898 +               if (msblk->swap) {
1899 +                       struct squashfs_dir_header sdirh;
1900 +
1901 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
1902 +                                       next_block, next_offset, sizeof(sdirh),
1903 +                                       &next_block, &next_offset))
1904 +                               goto failed_read;
1905 +
1906 +                       length += sizeof(sdirh);
1907 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
1908 +               } else {
1909 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
1910 +                                       next_block, next_offset, sizeof(dirh),
1911 +                                       &next_block, &next_offset))
1912 +                               goto failed_read;
1913 +
1914 +                       length += sizeof(dirh);
1915 +               }
1916 +
1917 +               dir_count = dirh.count + 1;
1918 +               while (dir_count--) {
1919 +                       if (msblk->swap) {
1920 +                               struct squashfs_dir_entry sdire;
1921 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1922 +                                               &sdire, next_block, next_offset,
1923 +                                               sizeof(sdire), &next_block,
1924 +                                               &next_offset))
1925 +                                       goto failed_read;
1926 +
1927 +                               length += sizeof(sdire);
1928 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
1929 +                       } else {
1930 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
1931 +                                               dire, next_block, next_offset,
1932 +                                               sizeof(*dire), &next_block,
1933 +                                               &next_offset))
1934 +                                       goto failed_read;
1935 +
1936 +                               length += sizeof(*dire);
1937 +                       }
1938 +
1939 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
1940 +                                               next_block, next_offset,
1941 +                                               dire->size + 1, &next_block,
1942 +                                               &next_offset))
1943 +                               goto failed_read;
1944 +
1945 +                       length += dire->size + 1;
1946 +
1947 +                       if (file->f_pos >= length)
1948 +                               continue;
1949 +
1950 +                       dire->name[dire->size + 1] = '\0';
1951 +
1952 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
1953 +                                       (unsigned int) dirent, dire->name,
1954 +                                       dire->size + 1, (int) file->f_pos,
1955 +                                       dirh.start_block, dire->offset,
1956 +                                       dirh.inode_number + dire->inode_number,
1957 +                                       squashfs_filetype_table[dire->type]);
1958 +
1959 +                       if (filldir(dirent, dire->name, dire->size + 1,
1960 +                                       file->f_pos,
1961 +                                       dirh.inode_number + dire->inode_number,
1962 +                                       squashfs_filetype_table[dire->type])
1963 +                                       < 0) {
1964 +                               TRACE("Filldir returned less than 0\n");
1965 +                               goto finish;
1966 +                       }
1967 +                       file->f_pos = length;
1968 +                       dirs_read++;
1969 +               }
1970 +       }
1971 +
1972 +finish:
1973 +       return dirs_read;
1974 +
1975 +failed_read:
1976 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
1977 +               next_offset);
1978 +       return 0;
1979 +}
1980 +
1981 +
1982 +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry,
1983 +                               struct nameidata *nd)
1984 +{
1985 +       const unsigned char *name = dentry->d_name.name;
1986 +       int len = dentry->d_name.len;
1987 +       struct inode *inode = NULL;
1988 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
1989 +       struct squashfs_super_block *sblk = &msblk->sblk;
1990 +       long long next_block = SQUASHFS_I(i)->start_block +
1991 +                               sblk->directory_table_start;
1992 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
1993 +                               dir_count;
1994 +       struct squashfs_dir_header dirh;
1995 +       char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN];
1996 +       struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
1997 +
1998 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
1999 +
2000 +       if (len > SQUASHFS_NAME_LEN)
2001 +               goto exit_loop;
2002 +
2003 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
2004 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2005 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2006 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
2007 +                               len);
2008 +
2009 +       while (length < i_size_read(i)) {
2010 +               /* read directory header */
2011 +               if (msblk->swap) {
2012 +                       struct squashfs_dir_header sdirh;
2013 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2014 +                                       next_block, next_offset, sizeof(sdirh),
2015 +                                       &next_block, &next_offset))
2016 +                               goto failed_read;
2017 +
2018 +                       length += sizeof(sdirh);
2019 +                       SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
2020 +               } else {
2021 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2022 +                                       next_block, next_offset, sizeof(dirh),
2023 +                                       &next_block, &next_offset))
2024 +                               goto failed_read;
2025 +
2026 +                       length += sizeof(dirh);
2027 +               }
2028 +
2029 +               dir_count = dirh.count + 1;
2030 +               while (dir_count--) {
2031 +                       if (msblk->swap) {
2032 +                               struct squashfs_dir_entry sdire;
2033 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2034 +                                               &sdire, next_block,next_offset,
2035 +                                               sizeof(sdire), &next_block,
2036 +                                               &next_offset))
2037 +                                       goto failed_read;
2038 +
2039 +                               length += sizeof(sdire);
2040 +                               SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
2041 +                       } else {
2042 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2043 +                                               dire, next_block,next_offset,
2044 +                                               sizeof(*dire), &next_block,
2045 +                                               &next_offset))
2046 +                                       goto failed_read;
2047 +
2048 +                               length += sizeof(*dire);
2049 +                       }
2050 +
2051 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2052 +                                       next_block, next_offset, dire->size + 1,
2053 +                                       &next_block, &next_offset))
2054 +                               goto failed_read;
2055 +
2056 +                       length += dire->size + 1;
2057 +
2058 +                       if (name[0] < dire->name[0])
2059 +                               goto exit_loop;
2060 +
2061 +                       if ((len == dire->size + 1) && !strncmp(name,
2062 +                                               dire->name, len)) {
2063 +                               squashfs_inode_t ino =
2064 +                                       SQUASHFS_MKINODE(dirh.start_block,
2065 +                                       dire->offset);
2066 +
2067 +                               TRACE("calling squashfs_iget for directory "
2068 +                                       "entry %s, inode %x:%x, %d\n", name,
2069 +                                       dirh.start_block, dire->offset,
2070 +                                       dirh.inode_number + dire->inode_number);
2071 +
2072 +                               inode = (msblk->iget)(i->i_sb, ino);
2073 +
2074 +                               goto exit_loop;
2075 +                       }
2076 +               }
2077 +       }
2078 +
2079 +exit_loop:
2080 +       d_add(dentry, inode);
2081 +       return ERR_PTR(0);
2082 +
2083 +failed_read:
2084 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2085 +               next_offset);
2086 +       goto exit_loop;
2087 +}
2088 +
2089 +
2090 +static void squashfs_put_super(struct super_block *s)
2091 +{
2092 +       int i;
2093 +
2094 +       if (s->s_fs_info) {
2095 +               struct squashfs_sb_info *sbi = s->s_fs_info;
2096 +               if (sbi->block_cache)
2097 +                       for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
2098 +                               if (sbi->block_cache[i].block !=
2099 +                                                       SQUASHFS_INVALID_BLK)
2100 +                                       kfree(sbi->block_cache[i].data);
2101 +               if (sbi->fragment)
2102 +                       for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++)
2103 +                               SQUASHFS_FREE(sbi->fragment[i].data);
2104 +               kfree(sbi->fragment);
2105 +               kfree(sbi->block_cache);
2106 +               kfree(sbi->read_data);
2107 +               kfree(sbi->read_page);
2108 +               kfree(sbi->uid);
2109 +               kfree(sbi->fragment_index);
2110 +               kfree(sbi->fragment_index_2);
2111 +               kfree(sbi->meta_index);
2112 +               kfree(s->s_fs_info);
2113 +               s->s_fs_info = NULL;
2114 +       }
2115 +}
2116 +
2117 +
2118 +static int squashfs_get_sb(struct file_system_type *fs_type,
2119 +                       int flags, const char *dev_name, void *data,
2120 +                       struct vfsmount *mnt)
2121 +{
2122 +       return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super, mnt);
2123 +}
2124 +
2125 +
2126 +static int __init init_squashfs_fs(void)
2127 +{
2128 +       int err = init_inodecache();
2129 +       if (err)
2130 +               goto out;
2131 +
2132 +       printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
2133 +               "Phillip Lougher\n");
2134 +
2135 +       if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
2136 +               ERROR("Failed to allocate zlib workspace\n");
2137 +               destroy_inodecache();
2138 +               err = -ENOMEM;
2139 +               goto out;
2140 +       }
2141 +
2142 +       if ((err = register_filesystem(&squashfs_fs_type))) {
2143 +               vfree(stream.workspace);
2144 +               destroy_inodecache();
2145 +       }
2146 +
2147 +out:
2148 +       return err;
2149 +}
2150 +
2151 +
2152 +static void __exit exit_squashfs_fs(void)
2153 +{
2154 +       vfree(stream.workspace);
2155 +       unregister_filesystem(&squashfs_fs_type);
2156 +       destroy_inodecache();
2157 +}
2158 +
2159 +
2160 +static struct kmem_cache * squashfs_inode_cachep;
2161 +
2162 +
2163 +static struct inode *squashfs_alloc_inode(struct super_block *sb)
2164 +{
2165 +       struct squashfs_inode_info *ei;
2166 +       ei = kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL);
2167 +       if (!ei)
2168 +               return NULL;
2169 +       return &ei->vfs_inode;
2170 +}
2171 +
2172 +
2173 +static void squashfs_destroy_inode(struct inode *inode)
2174 +{
2175 +       kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode));
2176 +}
2177 +
2178 +
2179 +static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
2180 +{
2181 +       struct squashfs_inode_info *ei = foo;
2182 +
2183 +       inode_init_once(&ei->vfs_inode);
2184 +}
2185 +
2186 +
2187 +static int __init init_inodecache(void)
2188 +{
2189 +       squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
2190 +            sizeof(struct squashfs_inode_info),
2191 +            0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
2192 +            init_once);
2193 +       if (squashfs_inode_cachep == NULL)
2194 +               return -ENOMEM;
2195 +       return 0;
2196 +}
2197 +
2198 +
2199 +static void destroy_inodecache(void)
2200 +{
2201 +       kmem_cache_destroy(squashfs_inode_cachep);
2202 +}
2203 +
2204 +
2205 +module_init(init_squashfs_fs);
2206 +module_exit(exit_squashfs_fs);
2207 +MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
2208 +MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
2209 +MODULE_LICENSE("GPL");
2210 --- /dev/null
2211 +++ b/fs/squashfs/Makefile
2212 @@ -0,0 +1,7 @@
2213 +#
2214 +# Makefile for the linux squashfs routines.
2215 +#
2216 +
2217 +obj-$(CONFIG_SQUASHFS) += squashfs.o
2218 +squashfs-y += inode.o
2219 +squashfs-y += squashfs2_0.o
2220 --- /dev/null
2221 +++ b/fs/squashfs/squashfs2_0.c
2222 @@ -0,0 +1,758 @@
2223 +/*
2224 + * Squashfs - a compressed read only filesystem for Linux
2225 + *
2226 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2227 + * Phillip Lougher <phillip@lougher.org.uk>
2228 + *
2229 + * This program is free software; you can redistribute it and/or
2230 + * modify it under the terms of the GNU General Public License
2231 + * as published by the Free Software Foundation; either version 2,
2232 + * or (at your option) any later version.
2233 + *
2234 + * This program is distributed in the hope that it will be useful,
2235 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2236 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2237 + * GNU General Public License for more details.
2238 + *
2239 + * You should have received a copy of the GNU General Public License
2240 + * along with this program; if not, write to the Free Software
2241 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
2242 + *
2243 + * squashfs2_0.c
2244 + */
2245 +
2246 +#include <linux/types.h>
2247 +#include <linux/squashfs_fs.h>
2248 +#include <linux/module.h>
2249 +#include <linux/errno.h>
2250 +#include <linux/slab.h>
2251 +#include <linux/fs.h>
2252 +#include <linux/smp_lock.h>
2253 +#include <linux/slab.h>
2254 +#include <linux/squashfs_fs_sb.h>
2255 +#include <linux/squashfs_fs_i.h>
2256 +#include <linux/buffer_head.h>
2257 +#include <linux/vfs.h>
2258 +#include <linux/init.h>
2259 +#include <linux/dcache.h>
2260 +#include <linux/wait.h>
2261 +#include <linux/zlib.h>
2262 +#include <linux/blkdev.h>
2263 +#include <linux/vmalloc.h>
2264 +#include <asm/uaccess.h>
2265 +#include <asm/semaphore.h>
2266 +
2267 +#include "squashfs.h"
2268 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
2269 +static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *,
2270 +                               struct nameidata *);
2271 +
2272 +static struct file_operations squashfs_dir_ops_2 = {
2273 +       .read = generic_read_dir,
2274 +       .readdir = squashfs_readdir_2
2275 +};
2276 +
2277 +static struct inode_operations squashfs_dir_inode_ops_2 = {
2278 +       .lookup = squashfs_lookup_2
2279 +};
2280 +
2281 +static unsigned char squashfs_filetype_table[] = {
2282 +       DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
2283 +};
2284 +
2285 +static int read_fragment_index_table_2(struct super_block *s)
2286 +{
2287 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2288 +       struct squashfs_super_block *sblk = &msblk->sblk;
2289 +
2290 +       if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
2291 +                                       (sblk->fragments), GFP_KERNEL))) {
2292 +               ERROR("Failed to allocate uid/gid table\n");
2293 +               return 0;
2294 +       }
2295 +
2296 +       if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
2297 +                                       !squashfs_read_data(s, (char *)
2298 +                                       msblk->fragment_index_2,
2299 +                                       sblk->fragment_table_start,
2300 +                                       SQUASHFS_FRAGMENT_INDEX_BYTES_2
2301 +                                       (sblk->fragments) |
2302 +                                       SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
2303 +               ERROR("unable to read fragment index table\n");
2304 +               return 0;
2305 +       }
2306 +
2307 +       if (msblk->swap) {
2308 +               int i;
2309 +               unsigned int fragment;
2310 +
2311 +               for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
2312 +                                                                       i++) {
2313 +                       SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
2314 +                                               &msblk->fragment_index_2[i], 1);
2315 +                       msblk->fragment_index_2[i] = fragment;
2316 +               }
2317 +       }
2318 +
2319 +       return 1;
2320 +}
2321 +
2322 +
2323 +static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
2324 +                               long long *fragment_start_block,
2325 +                               unsigned int *fragment_size)
2326 +{
2327 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2328 +       long long start_block =
2329 +               msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
2330 +       int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
2331 +       struct squashfs_fragment_entry_2 fragment_entry;
2332 +
2333 +       if (msblk->swap) {
2334 +               struct squashfs_fragment_entry_2 sfragment_entry;
2335 +
2336 +               if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
2337 +                                       start_block, offset,
2338 +                                       sizeof(sfragment_entry), &start_block,
2339 +                                       &offset))
2340 +                       goto out;
2341 +               SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
2342 +       } else
2343 +               if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
2344 +                                       start_block, offset,
2345 +                                       sizeof(fragment_entry), &start_block,
2346 +                                       &offset))
2347 +                       goto out;
2348 +
2349 +       *fragment_start_block = fragment_entry.start_block;
2350 +       *fragment_size = fragment_entry.size;
2351 +
2352 +       return 1;
2353 +
2354 +out:
2355 +       return 0;
2356 +}
2357 +
2358 +
2359 +static struct inode *squashfs_new_inode(struct super_block *s,
2360 +               struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
2361 +{
2362 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2363 +       struct squashfs_super_block *sblk = &msblk->sblk;
2364 +       struct inode *i = new_inode(s);
2365 +
2366 +       if (i) {
2367 +               i->i_ino = ino;
2368 +               i->i_mtime.tv_sec = sblk->mkfs_time;
2369 +               i->i_atime.tv_sec = sblk->mkfs_time;
2370 +               i->i_ctime.tv_sec = sblk->mkfs_time;
2371 +               i->i_uid = msblk->uid[inodeb->uid];
2372 +               i->i_mode = inodeb->mode;
2373 +               i->i_nlink = 1;
2374 +               i->i_size = 0;
2375 +               if (inodeb->guid == SQUASHFS_GUIDS)
2376 +                       i->i_gid = i->i_uid;
2377 +               else
2378 +                       i->i_gid = msblk->guid[inodeb->guid];
2379 +       }
2380 +
2381 +       return i;
2382 +}
2383 +
2384 +
2385 +static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
2386 +{
2387 +       struct inode *i;
2388 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2389 +       struct squashfs_super_block *sblk = &msblk->sblk;
2390 +       unsigned int block = SQUASHFS_INODE_BLK(inode) +
2391 +               sblk->inode_table_start;
2392 +       unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
2393 +       unsigned int ino = SQUASHFS_MK_VFS_INODE(block
2394 +               - sblk->inode_table_start, offset);
2395 +       long long next_block;
2396 +       unsigned int next_offset;
2397 +       union squashfs_inode_header_2 id, sid;
2398 +       struct squashfs_base_inode_header_2 *inodeb = &id.base,
2399 +                                         *sinodeb = &sid.base;
2400 +
2401 +       TRACE("Entered squashfs_iget\n");
2402 +
2403 +       if (msblk->swap) {
2404 +               if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
2405 +                                       offset, sizeof(*sinodeb), &next_block,
2406 +                                       &next_offset))
2407 +                       goto failed_read;
2408 +               SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
2409 +                                       sizeof(*sinodeb));
2410 +       } else
2411 +               if (!squashfs_get_cached_block(s, (char *) inodeb, block,
2412 +                                       offset, sizeof(*inodeb), &next_block,
2413 +                                       &next_offset))
2414 +                       goto failed_read;
2415 +
2416 +       switch(inodeb->inode_type) {
2417 +               case SQUASHFS_FILE_TYPE: {
2418 +                       struct squashfs_reg_inode_header_2 *inodep = &id.reg;
2419 +                       struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
2420 +                       long long frag_blk;
2421 +                       unsigned int frag_size;
2422 +
2423 +                       if (msblk->swap) {
2424 +                               if (!squashfs_get_cached_block(s, (char *)
2425 +                                               sinodep, block, offset,
2426 +                                               sizeof(*sinodep), &next_block,
2427 +                                               &next_offset))
2428 +                                       goto failed_read;
2429 +                               SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
2430 +                       } else
2431 +                               if (!squashfs_get_cached_block(s, (char *)
2432 +                                               inodep, block, offset,
2433 +                                               sizeof(*inodep), &next_block,
2434 +                                               &next_offset))
2435 +                                       goto failed_read;
2436 +
2437 +                       frag_blk = SQUASHFS_INVALID_BLK;
2438 +                       if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
2439 +                                       !get_fragment_location_2(s,
2440 +                                       inodep->fragment, &frag_blk, &frag_size))
2441 +                               goto failed_read;
2442 +
2443 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2444 +                               goto failed_read1;
2445 +
2446 +                       i->i_size = inodep->file_size;
2447 +                       i->i_fop = &generic_ro_fops;
2448 +                       i->i_mode |= S_IFREG;
2449 +                       i->i_mtime.tv_sec = inodep->mtime;
2450 +                       i->i_atime.tv_sec = inodep->mtime;
2451 +                       i->i_ctime.tv_sec = inodep->mtime;
2452 +                       i->i_blocks = ((i->i_size - 1) >> 9) + 1;
2453 +                       i->i_blksize = PAGE_CACHE_SIZE;
2454 +                       SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
2455 +                       SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
2456 +                       SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
2457 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2458 +                       SQUASHFS_I(i)->u.s1.block_list_start = next_block;
2459 +                       SQUASHFS_I(i)->offset = next_offset;
2460 +                       if (sblk->block_size > 4096)
2461 +                               i->i_data.a_ops = &squashfs_aops;
2462 +                       else
2463 +                               i->i_data.a_ops = &squashfs_aops_4K;
2464 +
2465 +                       TRACE("File inode %x:%x, start_block %x, "
2466 +                                       "block_list_start %llx, offset %x\n",
2467 +                                       SQUASHFS_INODE_BLK(inode), offset,
2468 +                                       inodep->start_block, next_block,
2469 +                                       next_offset);
2470 +                       break;
2471 +               }
2472 +               case SQUASHFS_DIR_TYPE: {
2473 +                       struct squashfs_dir_inode_header_2 *inodep = &id.dir;
2474 +                       struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
2475 +
2476 +                       if (msblk->swap) {
2477 +                               if (!squashfs_get_cached_block(s, (char *)
2478 +                                               sinodep, block, offset,
2479 +                                               sizeof(*sinodep), &next_block,
2480 +                                               &next_offset))
2481 +                                       goto failed_read;
2482 +                               SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
2483 +                       } else
2484 +                               if (!squashfs_get_cached_block(s, (char *)
2485 +                                               inodep, block, offset,
2486 +                                               sizeof(*inodep), &next_block,
2487 +                                               &next_offset))
2488 +                                       goto failed_read;
2489 +
2490 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2491 +                               goto failed_read1;
2492 +
2493 +                       i->i_size = inodep->file_size;
2494 +                       i->i_op = &squashfs_dir_inode_ops_2;
2495 +                       i->i_fop = &squashfs_dir_ops_2;
2496 +                       i->i_mode |= S_IFDIR;
2497 +                       i->i_mtime.tv_sec = inodep->mtime;
2498 +                       i->i_atime.tv_sec = inodep->mtime;
2499 +                       i->i_ctime.tv_sec = inodep->mtime;
2500 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2501 +                       SQUASHFS_I(i)->offset = inodep->offset;
2502 +                       SQUASHFS_I(i)->u.s2.directory_index_count = 0;
2503 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2504 +
2505 +                       TRACE("Directory inode %x:%x, start_block %x, offset "
2506 +                                       "%x\n", SQUASHFS_INODE_BLK(inode),
2507 +                                       offset, inodep->start_block,
2508 +                                       inodep->offset);
2509 +                       break;
2510 +               }
2511 +               case SQUASHFS_LDIR_TYPE: {
2512 +                       struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
2513 +                       struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
2514 +
2515 +                       if (msblk->swap) {
2516 +                               if (!squashfs_get_cached_block(s, (char *)
2517 +                                               sinodep, block, offset,
2518 +                                               sizeof(*sinodep), &next_block,
2519 +                                               &next_offset))
2520 +                                       goto failed_read;
2521 +                               SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
2522 +                                               sinodep);
2523 +                       } else
2524 +                               if (!squashfs_get_cached_block(s, (char *)
2525 +                                               inodep, block, offset,
2526 +                                               sizeof(*inodep), &next_block,
2527 +                                               &next_offset))
2528 +                                       goto failed_read;
2529 +
2530 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2531 +                               goto failed_read1;
2532 +
2533 +                       i->i_size = inodep->file_size;
2534 +                       i->i_op = &squashfs_dir_inode_ops_2;
2535 +                       i->i_fop = &squashfs_dir_ops_2;
2536 +                       i->i_mode |= S_IFDIR;
2537 +                       i->i_mtime.tv_sec = inodep->mtime;
2538 +                       i->i_atime.tv_sec = inodep->mtime;
2539 +                       i->i_ctime.tv_sec = inodep->mtime;
2540 +                       SQUASHFS_I(i)->start_block = inodep->start_block;
2541 +                       SQUASHFS_I(i)->offset = inodep->offset;
2542 +                       SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
2543 +                       SQUASHFS_I(i)->u.s2.directory_index_offset =
2544 +                                                               next_offset;
2545 +                       SQUASHFS_I(i)->u.s2.directory_index_count =
2546 +                                                               inodep->i_count;
2547 +                       SQUASHFS_I(i)->u.s2.parent_inode = 0;
2548 +
2549 +                       TRACE("Long directory inode %x:%x, start_block %x, "
2550 +                                       "offset %x\n",
2551 +                                       SQUASHFS_INODE_BLK(inode), offset,
2552 +                                       inodep->start_block, inodep->offset);
2553 +                       break;
2554 +               }
2555 +               case SQUASHFS_SYMLINK_TYPE: {
2556 +                       struct squashfs_symlink_inode_header_2 *inodep =
2557 +                                                               &id.symlink;
2558 +                       struct squashfs_symlink_inode_header_2 *sinodep =
2559 +                                                               &sid.symlink;
2560 +
2561 +                       if (msblk->swap) {
2562 +                               if (!squashfs_get_cached_block(s, (char *)
2563 +                                               sinodep, block, offset,
2564 +                                               sizeof(*sinodep), &next_block,
2565 +                                               &next_offset))
2566 +                                       goto failed_read;
2567 +                               SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
2568 +                                                               sinodep);
2569 +                       } else
2570 +                               if (!squashfs_get_cached_block(s, (char *)
2571 +                                               inodep, block, offset,
2572 +                                               sizeof(*inodep), &next_block,
2573 +                                               &next_offset))
2574 +                                       goto failed_read;
2575 +
2576 +                       if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2577 +                               goto failed_read1;
2578 +
2579 +                       i->i_size = inodep->symlink_size;
2580 +                       i->i_op = &page_symlink_inode_operations;
2581 +                       i->i_data.a_ops = &squashfs_symlink_aops;
2582 +                       i->i_mode |= S_IFLNK;
2583 +                       SQUASHFS_I(i)->start_block = next_block;
2584 +                       SQUASHFS_I(i)->offset = next_offset;
2585 +
2586 +                       TRACE("Symbolic link inode %x:%x, start_block %llx, "
2587 +                                       "offset %x\n",
2588 +                                       SQUASHFS_INODE_BLK(inode), offset,
2589 +                                       next_block, next_offset);
2590 +                       break;
2591 +                }
2592 +                case SQUASHFS_BLKDEV_TYPE:
2593 +                case SQUASHFS_CHRDEV_TYPE: {
2594 +                       struct squashfs_dev_inode_header_2 *inodep = &id.dev;
2595 +                       struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
2596 +
2597 +                       if (msblk->swap) {
2598 +                               if (!squashfs_get_cached_block(s, (char *)
2599 +                                               sinodep, block, offset,
2600 +                                               sizeof(*sinodep), &next_block,
2601 +                                               &next_offset))
2602 +                                       goto failed_read;
2603 +                               SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
2604 +                       } else
2605 +                               if (!squashfs_get_cached_block(s, (char *)
2606 +                                               inodep, block, offset,
2607 +                                               sizeof(*inodep), &next_block,
2608 +                                               &next_offset))
2609 +                                       goto failed_read;
2610 +
2611 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2612 +                               goto failed_read1;
2613 +
2614 +                       i->i_mode |= (inodeb->inode_type ==
2615 +                                       SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
2616 +                                       S_IFBLK;
2617 +                       init_special_inode(i, i->i_mode,
2618 +                                       old_decode_dev(inodep->rdev));
2619 +
2620 +                       TRACE("Device inode %x:%x, rdev %x\n",
2621 +                                       SQUASHFS_INODE_BLK(inode), offset,
2622 +                                       inodep->rdev);
2623 +                       break;
2624 +                }
2625 +                case SQUASHFS_FIFO_TYPE:
2626 +                case SQUASHFS_SOCKET_TYPE: {
2627 +                       if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
2628 +                               goto failed_read1;
2629 +
2630 +                       i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
2631 +                                                       ? S_IFIFO : S_IFSOCK;
2632 +                       init_special_inode(i, i->i_mode, 0);
2633 +                       break;
2634 +                }
2635 +                default:
2636 +                       ERROR("Unknown inode type %d in squashfs_iget!\n",
2637 +                                       inodeb->inode_type);
2638 +                       goto failed_read1;
2639 +       }
2640 +
2641 +       insert_inode_hash(i);
2642 +       return i;
2643 +
2644 +failed_read:
2645 +       ERROR("Unable to read inode [%x:%x]\n", block, offset);
2646 +
2647 +failed_read1:
2648 +       return NULL;
2649 +}
2650 +
2651 +
2652 +static int get_dir_index_using_offset(struct super_block *s, long long
2653 +                               *next_block, unsigned int *next_offset,
2654 +                               long long index_start,
2655 +                               unsigned int index_offset, int i_count,
2656 +                               long long f_pos)
2657 +{
2658 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2659 +       struct squashfs_super_block *sblk = &msblk->sblk;
2660 +       int i, length = 0;
2661 +       struct squashfs_dir_index_2 index;
2662 +
2663 +       TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
2664 +                                       i_count, (unsigned int) f_pos);
2665 +
2666 +       if (f_pos == 0)
2667 +               goto finish;
2668 +
2669 +       for (i = 0; i < i_count; i++) {
2670 +               if (msblk->swap) {
2671 +                       struct squashfs_dir_index_2 sindex;
2672 +                       squashfs_get_cached_block(s, (char *) &sindex,
2673 +                                       index_start, index_offset,
2674 +                                       sizeof(sindex), &index_start,
2675 +                                       &index_offset);
2676 +                       SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
2677 +               } else
2678 +                       squashfs_get_cached_block(s, (char *) &index,
2679 +                                       index_start, index_offset,
2680 +                                       sizeof(index), &index_start,
2681 +                                       &index_offset);
2682 +
2683 +               if (index.index > f_pos)
2684 +                       break;
2685 +
2686 +               squashfs_get_cached_block(s, NULL, index_start, index_offset,
2687 +                                       index.size + 1, &index_start,
2688 +                                       &index_offset);
2689 +
2690 +               length = index.index;
2691 +               *next_block = index.start_block + sblk->directory_table_start;
2692 +       }
2693 +
2694 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2695 +
2696 +finish:
2697 +       return length;
2698 +}
2699 +
2700 +
2701 +static int get_dir_index_using_name(struct super_block *s, long long
2702 +                               *next_block, unsigned int *next_offset,
2703 +                               long long index_start,
2704 +                               unsigned int index_offset, int i_count,
2705 +                               const char *name, int size)
2706 +{
2707 +       struct squashfs_sb_info *msblk = s->s_fs_info;
2708 +       struct squashfs_super_block *sblk = &msblk->sblk;
2709 +       int i, length = 0;
2710 +       char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1];
2711 +       struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer;
2712 +       char str[SQUASHFS_NAME_LEN + 1];
2713 +
2714 +       TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
2715 +
2716 +       strncpy(str, name, size);
2717 +       str[size] = '\0';
2718 +
2719 +       for (i = 0; i < i_count; i++) {
2720 +               if (msblk->swap) {
2721 +                       struct squashfs_dir_index_2 sindex;
2722 +                       squashfs_get_cached_block(s, (char *) &sindex,
2723 +                                       index_start, index_offset,
2724 +                                       sizeof(sindex), &index_start,
2725 +                                       &index_offset);
2726 +                       SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
2727 +               } else
2728 +                       squashfs_get_cached_block(s, (char *) index,
2729 +                                       index_start, index_offset,
2730 +                                       sizeof(struct squashfs_dir_index_2),
2731 +                                       &index_start, &index_offset);
2732 +
2733 +               squashfs_get_cached_block(s, index->name, index_start,
2734 +                                       index_offset, index->size + 1,
2735 +                                       &index_start, &index_offset);
2736 +
2737 +               index->name[index->size + 1] = '\0';
2738 +
2739 +               if (strcmp(index->name, str) > 0)
2740 +                       break;
2741 +
2742 +               length = index->index;
2743 +               *next_block = index->start_block + sblk->directory_table_start;
2744 +       }
2745 +
2746 +       *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
2747 +       return length;
2748 +}
2749 +
2750 +
2751 +static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
2752 +{
2753 +       struct inode *i = file->f_dentry->d_inode;
2754 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
2755 +       struct squashfs_super_block *sblk = &msblk->sblk;
2756 +       long long next_block = SQUASHFS_I(i)->start_block +
2757 +               sblk->directory_table_start;
2758 +       int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
2759 +               dir_count;
2760 +       struct squashfs_dir_header_2 dirh;
2761 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1];
2762 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2763 +
2764 +       TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
2765 +
2766 +       length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
2767 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2768 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2769 +                               SQUASHFS_I(i)->u.s2.directory_index_count,
2770 +                               file->f_pos);
2771 +
2772 +       while (length < i_size_read(i)) {
2773 +               /* read directory header */
2774 +               if (msblk->swap) {
2775 +                       struct squashfs_dir_header_2 sdirh;
2776 +
2777 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2778 +                                       next_block, next_offset, sizeof(sdirh),
2779 +                                       &next_block, &next_offset))
2780 +                               goto failed_read;
2781 +
2782 +                       length += sizeof(sdirh);
2783 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2784 +               } else {
2785 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2786 +                                       next_block, next_offset, sizeof(dirh),
2787 +                                       &next_block, &next_offset))
2788 +                               goto failed_read;
2789 +
2790 +                       length += sizeof(dirh);
2791 +               }
2792 +
2793 +               dir_count = dirh.count + 1;
2794 +               while (dir_count--) {
2795 +                       if (msblk->swap) {
2796 +                               struct squashfs_dir_entry_2 sdire;
2797 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2798 +                                               &sdire, next_block, next_offset,
2799 +                                               sizeof(sdire), &next_block,
2800 +                                               &next_offset))
2801 +                                       goto failed_read;
2802 +
2803 +                               length += sizeof(sdire);
2804 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2805 +                       } else {
2806 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2807 +                                               dire, next_block, next_offset,
2808 +                                               sizeof(*dire), &next_block,
2809 +                                               &next_offset))
2810 +                                       goto failed_read;
2811 +
2812 +                               length += sizeof(*dire);
2813 +                       }
2814 +
2815 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2816 +                                               next_block, next_offset,
2817 +                                               dire->size + 1, &next_block,
2818 +                                               &next_offset))
2819 +                               goto failed_read;
2820 +
2821 +                       length += dire->size + 1;
2822 +
2823 +                       if (file->f_pos >= length)
2824 +                               continue;
2825 +
2826 +                       dire->name[dire->size + 1] = '\0';
2827 +
2828 +                       TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
2829 +                                       (unsigned int) dirent, dire->name,
2830 +                                       dire->size + 1, (int) file->f_pos,
2831 +                                       dirh.start_block, dire->offset,
2832 +                                       squashfs_filetype_table[dire->type]);
2833 +
2834 +                       if (filldir(dirent, dire->name, dire->size + 1,
2835 +                                       file->f_pos, SQUASHFS_MK_VFS_INODE(
2836 +                                       dirh.start_block, dire->offset),
2837 +                                       squashfs_filetype_table[dire->type])
2838 +                                       < 0) {
2839 +                               TRACE("Filldir returned less than 0\n");
2840 +                               goto finish;
2841 +                       }
2842 +                       file->f_pos = length;
2843 +                       dirs_read++;
2844 +               }
2845 +       }
2846 +
2847 +finish:
2848 +       return dirs_read;
2849 +
2850 +failed_read:
2851 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2852 +               next_offset);
2853 +       return 0;
2854 +}
2855 +
2856 +
2857 +static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry,
2858 +                               struct nameidata *nd)
2859 +{
2860 +       const unsigned char *name = dentry->d_name.name;
2861 +       int len = dentry->d_name.len;
2862 +       struct inode *inode = NULL;
2863 +       struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
2864 +       struct squashfs_super_block *sblk = &msblk->sblk;
2865 +       long long next_block = SQUASHFS_I(i)->start_block +
2866 +                               sblk->directory_table_start;
2867 +       int next_offset = SQUASHFS_I(i)->offset, length = 0,
2868 +                               dir_count;
2869 +       struct squashfs_dir_header_2 dirh;
2870 +       char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN];
2871 +       struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
2872 +       int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
2873 +
2874 +       TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
2875 +
2876 +       if (len > SQUASHFS_NAME_LEN)
2877 +               goto exit_loop;
2878 +
2879 +       length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
2880 +                               SQUASHFS_I(i)->u.s2.directory_index_start,
2881 +                               SQUASHFS_I(i)->u.s2.directory_index_offset,
2882 +                               SQUASHFS_I(i)->u.s2.directory_index_count, name,
2883 +                               len);
2884 +
2885 +       while (length < i_size_read(i)) {
2886 +               /* read directory header */
2887 +               if (msblk->swap) {
2888 +                       struct squashfs_dir_header_2 sdirh;
2889 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
2890 +                                       next_block, next_offset, sizeof(sdirh),
2891 +                                       &next_block, &next_offset))
2892 +                               goto failed_read;
2893 +
2894 +                       length += sizeof(sdirh);
2895 +                       SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
2896 +               } else {
2897 +                       if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
2898 +                                       next_block, next_offset, sizeof(dirh),
2899 +                                       &next_block, &next_offset))
2900 +                               goto failed_read;
2901 +
2902 +                       length += sizeof(dirh);
2903 +               }
2904 +
2905 +               dir_count = dirh.count + 1;
2906 +               while (dir_count--) {
2907 +                       if (msblk->swap) {
2908 +                               struct squashfs_dir_entry_2 sdire;
2909 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2910 +                                               &sdire, next_block,next_offset,
2911 +                                               sizeof(sdire), &next_block,
2912 +                                               &next_offset))
2913 +                                       goto failed_read;
2914 +
2915 +                               length += sizeof(sdire);
2916 +                               SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
2917 +                       } else {
2918 +                               if (!squashfs_get_cached_block(i->i_sb, (char *)
2919 +                                               dire, next_block,next_offset,
2920 +                                               sizeof(*dire), &next_block,
2921 +                                               &next_offset))
2922 +                                       goto failed_read;
2923 +
2924 +                               length += sizeof(*dire);
2925 +                       }
2926 +
2927 +                       if (!squashfs_get_cached_block(i->i_sb, dire->name,
2928 +                                       next_block, next_offset, dire->size + 1,
2929 +                                       &next_block, &next_offset))
2930 +                               goto failed_read;
2931 +
2932 +                       length += dire->size + 1;
2933 +
2934 +                       if (sorted && name[0] < dire->name[0])
2935 +                               goto exit_loop;
2936 +
2937 +                       if ((len == dire->size + 1) && !strncmp(name,
2938 +                                               dire->name, len)) {
2939 +                               squashfs_inode_t ino =
2940 +                                       SQUASHFS_MKINODE(dirh.start_block,
2941 +                                       dire->offset);
2942 +
2943 +                               TRACE("calling squashfs_iget for directory "
2944 +                                       "entry %s, inode %x:%x, %lld\n", name,
2945 +                                       dirh.start_block, dire->offset, ino);
2946 +
2947 +                               inode = (msblk->iget)(i->i_sb, ino);
2948 +
2949 +                               goto exit_loop;
2950 +                       }
2951 +               }
2952 +       }
2953 +
2954 +exit_loop:
2955 +       d_add(dentry, inode);
2956 +       return ERR_PTR(0);
2957 +
2958 +failed_read:
2959 +       ERROR("Unable to read directory block [%llx:%x]\n", next_block,
2960 +               next_offset);
2961 +       goto exit_loop;
2962 +}
2963 +
2964 +
2965 +int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
2966 +{
2967 +       struct squashfs_super_block *sblk = &msblk->sblk;
2968 +
2969 +       msblk->iget = squashfs_iget_2;
2970 +       msblk->read_fragment_index_table = read_fragment_index_table_2;
2971 +
2972 +       sblk->bytes_used = sblk->bytes_used_2;
2973 +       sblk->uid_start = sblk->uid_start_2;
2974 +       sblk->guid_start = sblk->guid_start_2;
2975 +       sblk->inode_table_start = sblk->inode_table_start_2;
2976 +       sblk->directory_table_start = sblk->directory_table_start_2;
2977 +       sblk->fragment_table_start = sblk->fragment_table_start_2;
2978 +
2979 +       return 1;
2980 +}
2981 --- /dev/null
2982 +++ b/fs/squashfs/squashfs.h
2983 @@ -0,0 +1,86 @@
2984 +/*
2985 + * Squashfs - a compressed read only filesystem for Linux
2986 + *
2987 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
2988 + * Phillip Lougher <phillip@lougher.org.uk>
2989 + *
2990 + * This program is free software; you can redistribute it and/or
2991 + * modify it under the terms of the GNU General Public License
2992 + * as published by the Free Software Foundation; either version 2,
2993 + * or (at your option) any later version.
2994 + *
2995 + * This program is distributed in the hope that it will be useful,
2996 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2997 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2998 + * GNU General Public License for more details.
2999 + *
3000 + * You should have received a copy of the GNU General Public License
3001 + * along with this program; if not, write to the Free Software
3002 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3003 + *
3004 + * squashfs.h
3005 + */
3006 +
3007 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3008 +#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3009 +#endif
3010 +
3011 +#ifdef SQUASHFS_TRACE
3012 +#define TRACE(s, args...)      printk(KERN_NOTICE "SQUASHFS: "s, ## args)
3013 +#else
3014 +#define TRACE(s, args...)      {}
3015 +#endif
3016 +
3017 +#define ERROR(s, args...)      printk(KERN_ERR "SQUASHFS error: "s, ## args)
3018 +
3019 +#define SERROR(s, args...)     do { \
3020 +                               if (!silent) \
3021 +                               printk(KERN_ERR "SQUASHFS error: "s, ## args);\
3022 +                               } while(0)
3023 +
3024 +#define WARNING(s, args...)    printk(KERN_WARNING "SQUASHFS: "s, ## args)
3025 +
3026 +static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
3027 +{
3028 +       return list_entry(inode, struct squashfs_inode_info, vfs_inode);
3029 +}
3030 +
3031 +#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
3032 +#define SQSH_EXTERN
3033 +extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
3034 +                               long long index, unsigned int length,
3035 +                               long long *next_index);
3036 +extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
3037 +                               long long block, unsigned int offset,
3038 +                               int length, long long *next_block,
3039 +                               unsigned int *next_offset);
3040 +extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
3041 +                                       squashfs_fragment_cache *fragment);
3042 +extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
3043 +                                       *s, long long start_block,
3044 +                                       int length);
3045 +extern struct address_space_operations squashfs_symlink_aops;
3046 +extern struct address_space_operations squashfs_aops;
3047 +extern struct address_space_operations squashfs_aops_4K;
3048 +extern struct inode_operations squashfs_dir_inode_ops;
3049 +#else
3050 +#define SQSH_EXTERN static
3051 +#endif
3052 +
3053 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3054 +extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
3055 +#else
3056 +static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
3057 +{
3058 +       return 0;
3059 +}
3060 +#endif
3061 +
3062 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3063 +extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
3064 +#else
3065 +static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
3066 +{
3067 +       return 0;
3068 +}
3069 +#endif
3070 --- a/include/linux/magic.h
3071 +++ b/include/linux/magic.h
3072 @@ -35,6 +35,9 @@
3073  #define REISER2FS_SUPER_MAGIC_STRING   "ReIsEr2Fs"
3074  #define REISER2FS_JR_SUPER_MAGIC_STRING        "ReIsEr3Fs"
3075
3076 +#define SQUASHFS_MAGIC                 0x73717368
3077 +#define SQUASHFS_MAGIC_SWAP            0x68737173
3078 +
3079  #define SMB_SUPER_MAGIC                0x517B
3080  #define USBDEVICE_SUPER_MAGIC  0x9fa2
3081  #define CGROUP_SUPER_MAGIC     0x27e0eb
3082 --- /dev/null
3083 +++ b/include/linux/squashfs_fs.h
3084 @@ -0,0 +1,911 @@
3085 +#ifndef SQUASHFS_FS
3086 +#define SQUASHFS_FS
3087 +
3088 +/*
3089 + * Squashfs
3090 + *
3091 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
3092 + * Phillip Lougher <phillip@lougher.org.uk>
3093 + *
3094 + * This program is free software; you can redistribute it and/or
3095 + * modify it under the terms of the GNU General Public License
3096 + * as published by the Free Software Foundation; either version 2,
3097 + * or (at your option) any later version.
3098 + *
3099 + * This program is distributed in the hope that it will be useful,
3100 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3101 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
3102 + * GNU General Public License for more details.
3103 + *
3104 + * You should have received a copy of the GNU General Public License
3105 + * along with this program; if not, write to the Free Software
3106 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
3107 + *
3108 + * squashfs_fs.h
3109 + */
3110 +
3111 +#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3112 +#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
3113 +#endif
3114 +
3115 +#ifdef CONFIG_SQUASHFS_VMALLOC
3116 +#define SQUASHFS_ALLOC(a)              vmalloc(a)
3117 +#define SQUASHFS_FREE(a)               vfree(a)
3118 +#else
3119 +#define SQUASHFS_ALLOC(a)              kmalloc(a, GFP_KERNEL)
3120 +#define SQUASHFS_FREE(a)               kfree(a)
3121 +#endif
3122 +#define SQUASHFS_CACHED_FRAGMENTS      CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
3123 +#define SQUASHFS_MAJOR                 3
3124 +#define SQUASHFS_MINOR                 0
3125 +#define SQUASHFS_START                 0
3126 +
3127 +/* size of metadata (inode and directory) blocks */
3128 +#define SQUASHFS_METADATA_SIZE         8192
3129 +#define SQUASHFS_METADATA_LOG          13
3130 +
3131 +/* default size of data blocks */
3132 +#define SQUASHFS_FILE_SIZE             65536
3133 +#define SQUASHFS_FILE_LOG              16
3134 +
3135 +#define SQUASHFS_FILE_MAX_SIZE         65536
3136 +
3137 +/* Max number of uids and gids */
3138 +#define SQUASHFS_UIDS                  256
3139 +#define SQUASHFS_GUIDS                 255
3140 +
3141 +/* Max length of filename (not 255) */
3142 +#define SQUASHFS_NAME_LEN              256
3143 +
3144 +#define SQUASHFS_INVALID               ((long long) 0xffffffffffff)
3145 +#define SQUASHFS_INVALID_FRAG          ((unsigned int) 0xffffffff)
3146 +#define SQUASHFS_INVALID_BLK           ((long long) -1)
3147 +#define SQUASHFS_USED_BLK              ((long long) -2)
3148 +
3149 +/* Filesystem flags */
3150 +#define SQUASHFS_NOI                   0
3151 +#define SQUASHFS_NOD                   1
3152 +#define SQUASHFS_CHECK                 2
3153 +#define SQUASHFS_NOF                   3
3154 +#define SQUASHFS_NO_FRAG               4
3155 +#define SQUASHFS_ALWAYS_FRAG           5
3156 +#define SQUASHFS_DUPLICATE             6
3157 +
3158 +#define SQUASHFS_BIT(flag, bit)                ((flag >> bit) & 1)
3159 +
3160 +#define SQUASHFS_UNCOMPRESSED_INODES(flags)    SQUASHFS_BIT(flags, \
3161 +                                               SQUASHFS_NOI)
3162 +
3163 +#define SQUASHFS_UNCOMPRESSED_DATA(flags)      SQUASHFS_BIT(flags, \
3164 +                                               SQUASHFS_NOD)
3165 +
3166 +#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
3167 +                                               SQUASHFS_NOF)
3168 +
3169 +#define SQUASHFS_NO_FRAGMENTS(flags)           SQUASHFS_BIT(flags, \
3170 +                                               SQUASHFS_NO_FRAG)
3171 +
3172 +#define SQUASHFS_ALWAYS_FRAGMENTS(flags)       SQUASHFS_BIT(flags, \
3173 +                                               SQUASHFS_ALWAYS_FRAG)
3174 +
3175 +#define SQUASHFS_DUPLICATES(flags)             SQUASHFS_BIT(flags, \
3176 +                                               SQUASHFS_DUPLICATE)
3177 +
3178 +#define SQUASHFS_CHECK_DATA(flags)             SQUASHFS_BIT(flags, \
3179 +                                               SQUASHFS_CHECK)
3180 +
3181 +#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
3182 +               duplicate_checking)     (noi | (nod << 1) | (check_data << 2) \
3183 +               | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
3184 +               (duplicate_checking << 6))
3185 +
3186 +/* Max number of types and file types */
3187 +#define SQUASHFS_DIR_TYPE              1
3188 +#define SQUASHFS_FILE_TYPE             2
3189 +#define SQUASHFS_SYMLINK_TYPE          3
3190 +#define SQUASHFS_BLKDEV_TYPE           4
3191 +#define SQUASHFS_CHRDEV_TYPE           5
3192 +#define SQUASHFS_FIFO_TYPE             6
3193 +#define SQUASHFS_SOCKET_TYPE           7
3194 +#define SQUASHFS_LDIR_TYPE             8
3195 +#define SQUASHFS_LREG_TYPE             9
3196 +
3197 +/* 1.0 filesystem type definitions */
3198 +#define SQUASHFS_TYPES                 5
3199 +#define SQUASHFS_IPC_TYPE              0
3200 +
3201 +/* Flag whether block is compressed or uncompressed, bit is set if block is
3202 + * uncompressed */
3203 +#define SQUASHFS_COMPRESSED_BIT                (1 << 15)
3204 +
3205 +#define SQUASHFS_COMPRESSED_SIZE(B)    (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
3206 +               (B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)
3207 +
3208 +#define SQUASHFS_COMPRESSED(B)         (!((B) & SQUASHFS_COMPRESSED_BIT))
3209 +
3210 +#define SQUASHFS_COMPRESSED_BIT_BLOCK          (1 << 24)
3211 +
3212 +#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)      (((B) & \
3213 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
3214 +       ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
3215 +
3216 +#define SQUASHFS_COMPRESSED_BLOCK(B)   (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
3217 +
3218 +/*
3219 + * Inode number ops.  Inodes consist of a compressed block number, and an
3220 + * uncompressed  offset within that block
3221 + */
3222 +#define SQUASHFS_INODE_BLK(a)          ((unsigned int) ((a) >> 16))
3223 +
3224 +#define SQUASHFS_INODE_OFFSET(a)       ((unsigned int) ((a) & 0xffff))
3225 +
3226 +#define SQUASHFS_MKINODE(A, B)         ((squashfs_inode_t)(((squashfs_inode_t) (A)\
3227 +                                       << 16) + (B)))
3228 +
3229 +/* Compute 32 bit VFS inode number from squashfs inode number */
3230 +#define SQUASHFS_MK_VFS_INODE(a, b)    ((unsigned int) (((a) << 8) + \
3231 +                                       ((b) >> 2) + 1))
3232 +/* XXX */
3233 +
3234 +/* Translate between VFS mode and squashfs mode */
3235 +#define SQUASHFS_MODE(a)               ((a) & 0xfff)
3236 +
3237 +/* fragment and fragment table defines */
3238 +#define SQUASHFS_FRAGMENT_BYTES(A)     (A * sizeof(struct squashfs_fragment_entry))
3239 +
3240 +#define SQUASHFS_FRAGMENT_INDEX(A)     (SQUASHFS_FRAGMENT_BYTES(A) / \
3241 +                                       SQUASHFS_METADATA_SIZE)
3242 +
3243 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)      (SQUASHFS_FRAGMENT_BYTES(A) % \
3244 +                                               SQUASHFS_METADATA_SIZE)
3245 +
3246 +#define SQUASHFS_FRAGMENT_INDEXES(A)   ((SQUASHFS_FRAGMENT_BYTES(A) + \
3247 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3248 +                                       SQUASHFS_METADATA_SIZE)
3249 +
3250 +#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)       (SQUASHFS_FRAGMENT_INDEXES(A) *\
3251 +                                               sizeof(long long))
3252 +
3253 +/* cached data constants for filesystem */
3254 +#define SQUASHFS_CACHED_BLKS           8
3255 +
3256 +#define SQUASHFS_MAX_FILE_SIZE_LOG     64
3257 +
3258 +#define SQUASHFS_MAX_FILE_SIZE         ((long long) 1 << \
3259 +                                       (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
3260 +
3261 +#define SQUASHFS_MARKER_BYTE           0xff
3262 +
3263 +/* meta index cache */
3264 +#define SQUASHFS_META_INDEXES  (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
3265 +#define SQUASHFS_META_ENTRIES  31
3266 +#define SQUASHFS_META_NUMBER   8
3267 +#define SQUASHFS_SLOTS         4
3268 +
3269 +#include <linux/magic.h>
3270 +
3271 +struct meta_entry {
3272 +       long long               data_block;
3273 +       unsigned int            index_block;
3274 +       unsigned short          offset;
3275 +       unsigned short          pad;
3276 +};
3277 +
3278 +struct meta_index {
3279 +       unsigned int            inode_number;
3280 +       unsigned int            offset;
3281 +       unsigned short          entries;
3282 +       unsigned short          skip;
3283 +       unsigned short          locked;
3284 +       unsigned short          pad;
3285 +       struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
3286 +};
3287 +
3288 +
3289 +/*
3290 + * definitions for structures on disk
3291 + */
3292 +
3293 +typedef long long              squashfs_block_t;
3294 +typedef long long              squashfs_inode_t;
3295 +
3296 +struct squashfs_super_block {
3297 +       unsigned int            s_magic;
3298 +       unsigned int            inodes;
3299 +       unsigned int            bytes_used_2;
3300 +       unsigned int            uid_start_2;
3301 +       unsigned int            guid_start_2;
3302 +       unsigned int            inode_table_start_2;
3303 +       unsigned int            directory_table_start_2;
3304 +       unsigned int            s_major:16;
3305 +       unsigned int            s_minor:16;
3306 +       unsigned int            block_size_1:16;
3307 +       unsigned int            block_log:16;
3308 +       unsigned int            flags:8;
3309 +       unsigned int            no_uids:8;
3310 +       unsigned int            no_guids:8;
3311 +       unsigned int            mkfs_time /* time of filesystem creation */;
3312 +       squashfs_inode_t        root_inode;
3313 +       unsigned int            block_size;
3314 +       unsigned int            fragments;
3315 +       unsigned int            fragment_table_start_2;
3316 +       long long               bytes_used;
3317 +       long long               uid_start;
3318 +       long long               guid_start;
3319 +       long long               inode_table_start;
3320 +       long long               directory_table_start;
3321 +       long long               fragment_table_start;
3322 +       long long               unused;
3323 +} __attribute__ ((packed));
3324 +
3325 +struct squashfs_dir_index {
3326 +       unsigned int            index;
3327 +       unsigned int            start_block;
3328 +       unsigned char           size;
3329 +       unsigned char           name[0];
3330 +} __attribute__ ((packed));
3331 +
3332 +#define SQUASHFS_BASE_INODE_HEADER             \
3333 +       unsigned int            inode_type:4;   \
3334 +       unsigned int            mode:12;        \
3335 +       unsigned int            uid:8;          \
3336 +       unsigned int            guid:8;         \
3337 +       unsigned int            mtime;          \
3338 +       unsigned int            inode_number;
3339 +
3340 +struct squashfs_base_inode_header {
3341 +       SQUASHFS_BASE_INODE_HEADER;
3342 +} __attribute__ ((packed));
3343 +
3344 +struct squashfs_ipc_inode_header {
3345 +       SQUASHFS_BASE_INODE_HEADER;
3346 +       unsigned int            nlink;
3347 +} __attribute__ ((packed));
3348 +
3349 +struct squashfs_dev_inode_header {
3350 +       SQUASHFS_BASE_INODE_HEADER;
3351 +       unsigned int            nlink;
3352 +       unsigned short          rdev;
3353 +} __attribute__ ((packed));
3354 +
3355 +struct squashfs_symlink_inode_header {
3356 +       SQUASHFS_BASE_INODE_HEADER;
3357 +       unsigned int            nlink;
3358 +       unsigned short          symlink_size;
3359 +       char                    symlink[0];
3360 +} __attribute__ ((packed));
3361 +
3362 +struct squashfs_reg_inode_header {
3363 +       SQUASHFS_BASE_INODE_HEADER;
3364 +       squashfs_block_t        start_block;
3365 +       unsigned int            fragment;
3366 +       unsigned int            offset;
3367 +       unsigned int            file_size;
3368 +       unsigned short          block_list[0];
3369 +} __attribute__ ((packed));
3370 +
3371 +struct squashfs_lreg_inode_header {
3372 +       SQUASHFS_BASE_INODE_HEADER;
3373 +       unsigned int            nlink;
3374 +       squashfs_block_t        start_block;
3375 +       unsigned int            fragment;
3376 +       unsigned int            offset;
3377 +       long long               file_size;
3378 +       unsigned short          block_list[0];
3379 +} __attribute__ ((packed));
3380 +
3381 +struct squashfs_dir_inode_header {
3382 +       SQUASHFS_BASE_INODE_HEADER;
3383 +       unsigned int            nlink;
3384 +       unsigned int            file_size:19;
3385 +       unsigned int            offset:13;
3386 +       unsigned int            start_block;
3387 +       unsigned int            parent_inode;
3388 +} __attribute__  ((packed));
3389 +
3390 +struct squashfs_ldir_inode_header {
3391 +       SQUASHFS_BASE_INODE_HEADER;
3392 +       unsigned int            nlink;
3393 +       unsigned int            file_size:27;
3394 +       unsigned int            offset:13;
3395 +       unsigned int            start_block;
3396 +       unsigned int            i_count:16;
3397 +       unsigned int            parent_inode;
3398 +       struct squashfs_dir_index       index[0];
3399 +} __attribute__  ((packed));
3400 +
3401 +union squashfs_inode_header {
3402 +       struct squashfs_base_inode_header       base;
3403 +       struct squashfs_dev_inode_header        dev;
3404 +       struct squashfs_symlink_inode_header    symlink;
3405 +       struct squashfs_reg_inode_header        reg;
3406 +       struct squashfs_lreg_inode_header       lreg;
3407 +       struct squashfs_dir_inode_header        dir;
3408 +       struct squashfs_ldir_inode_header       ldir;
3409 +       struct squashfs_ipc_inode_header        ipc;
3410 +};
3411 +
3412 +struct squashfs_dir_entry {
3413 +       unsigned int            offset:13;
3414 +       unsigned int            type:3;
3415 +       unsigned int            size:8;
3416 +       int                     inode_number:16;
3417 +       char                    name[0];
3418 +} __attribute__ ((packed));
3419 +
3420 +struct squashfs_dir_header {
3421 +       unsigned int            count:8;
3422 +       unsigned int            start_block;
3423 +       unsigned int            inode_number;
3424 +} __attribute__ ((packed));
3425 +
3426 +struct squashfs_fragment_entry {
3427 +       long long               start_block;
3428 +       unsigned int            size;
3429 +       unsigned int            unused;
3430 +} __attribute__ ((packed));
3431 +
3432 +extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
3433 +extern int squashfs_uncompress_init(void);
3434 +extern int squashfs_uncompress_exit(void);
3435 +
3436 +/*
3437 + * macros to convert each packed bitfield structure from little endian to big
3438 + * endian and vice versa.  These are needed when creating or using a filesystem
3439 + * on a machine with different byte ordering to the target architecture.
3440 + *
3441 + */
3442 +
3443 +#define SQUASHFS_SWAP_START \
3444 +       int bits;\
3445 +       int b_pos;\
3446 +       unsigned long long val;\
3447 +       unsigned char *s;\
3448 +       unsigned char *d;
3449 +
3450 +#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
3451 +       SQUASHFS_SWAP_START\
3452 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
3453 +       SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
3454 +       SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
3455 +       SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
3456 +       SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
3457 +       SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
3458 +       SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
3459 +       SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
3460 +       SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
3461 +       SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
3462 +       SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\
3463 +       SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
3464 +       SQUASHFS_SWAP((s)->flags, d, 288, 8);\
3465 +       SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
3466 +       SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
3467 +       SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
3468 +       SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
3469 +       SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
3470 +       SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
3471 +       SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
3472 +       SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
3473 +       SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
3474 +       SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
3475 +       SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
3476 +       SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
3477 +       SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
3478 +       SQUASHFS_SWAP((s)->unused, d, 888, 64);\
3479 +}
3480 +
3481 +#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3482 +       SQUASHFS_MEMSET(s, d, n);\
3483 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3484 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3485 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3486 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3487 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3488 +       SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
3489 +
3490 +#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
3491 +       SQUASHFS_SWAP_START\
3492 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
3493 +}
3494 +
3495 +#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
3496 +       SQUASHFS_SWAP_START\
3497 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3498 +                       sizeof(struct squashfs_ipc_inode_header))\
3499 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3500 +}
3501 +
3502 +#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
3503 +       SQUASHFS_SWAP_START\
3504 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3505 +                       sizeof(struct squashfs_dev_inode_header)); \
3506 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3507 +       SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
3508 +}
3509 +
3510 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
3511 +       SQUASHFS_SWAP_START\
3512 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3513 +                       sizeof(struct squashfs_symlink_inode_header));\
3514 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3515 +       SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
3516 +}
3517 +
3518 +#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
3519 +       SQUASHFS_SWAP_START\
3520 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3521 +                       sizeof(struct squashfs_reg_inode_header));\
3522 +       SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
3523 +       SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
3524 +       SQUASHFS_SWAP((s)->offset, d, 192, 32);\
3525 +       SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
3526 +}
3527 +
3528 +#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
3529 +       SQUASHFS_SWAP_START\
3530 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3531 +                       sizeof(struct squashfs_lreg_inode_header));\
3532 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3533 +       SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
3534 +       SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
3535 +       SQUASHFS_SWAP((s)->offset, d, 224, 32);\
3536 +       SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
3537 +}
3538 +
3539 +#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
3540 +       SQUASHFS_SWAP_START\
3541 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3542 +                       sizeof(struct squashfs_dir_inode_header));\
3543 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3544 +       SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
3545 +       SQUASHFS_SWAP((s)->offset, d, 147, 13);\
3546 +       SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
3547 +       SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
3548 +}
3549 +
3550 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
3551 +       SQUASHFS_SWAP_START\
3552 +       SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
3553 +                       sizeof(struct squashfs_ldir_inode_header));\
3554 +       SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
3555 +       SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
3556 +       SQUASHFS_SWAP((s)->offset, d, 155, 13);\
3557 +       SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
3558 +       SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
3559 +       SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
3560 +}
3561 +
3562 +#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
3563 +       SQUASHFS_SWAP_START\
3564 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
3565 +       SQUASHFS_SWAP((s)->index, d, 0, 32);\
3566 +       SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
3567 +       SQUASHFS_SWAP((s)->size, d, 64, 8);\
3568 +}
3569 +
3570 +#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
3571 +       SQUASHFS_SWAP_START\
3572 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
3573 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3574 +       SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
3575 +       SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
3576 +}
3577 +
3578 +#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
3579 +       SQUASHFS_SWAP_START\
3580 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
3581 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3582 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3583 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3584 +       SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
3585 +}
3586 +
3587 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
3588 +       SQUASHFS_SWAP_START\
3589 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
3590 +       SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
3591 +       SQUASHFS_SWAP((s)->size, d, 64, 32);\
3592 +}
3593 +
3594 +#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
3595 +       int entry;\
3596 +       int bit_position;\
3597 +       SQUASHFS_SWAP_START\
3598 +       SQUASHFS_MEMSET(s, d, n * 2);\
3599 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3600 +                       16)\
3601 +               SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
3602 +}
3603 +
3604 +#define SQUASHFS_SWAP_INTS(s, d, n) {\
3605 +       int entry;\
3606 +       int bit_position;\
3607 +       SQUASHFS_SWAP_START\
3608 +       SQUASHFS_MEMSET(s, d, n * 4);\
3609 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3610 +                       32)\
3611 +               SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
3612 +}
3613 +
3614 +#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
3615 +       int entry;\
3616 +       int bit_position;\
3617 +       SQUASHFS_SWAP_START\
3618 +       SQUASHFS_MEMSET(s, d, n * 8);\
3619 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3620 +                       64)\
3621 +               SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
3622 +}
3623 +
3624 +#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
3625 +       int entry;\
3626 +       int bit_position;\
3627 +       SQUASHFS_SWAP_START\
3628 +       SQUASHFS_MEMSET(s, d, n * bits / 8);\
3629 +       for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
3630 +                       bits)\
3631 +               SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
3632 +}
3633 +
3634 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
3635 +
3636 +#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
3637 +
3638 +struct squashfs_base_inode_header_1 {
3639 +       unsigned int            inode_type:4;
3640 +       unsigned int            mode:12; /* protection */
3641 +       unsigned int            uid:4; /* index into uid table */
3642 +       unsigned int            guid:4; /* index into guid table */
3643 +} __attribute__ ((packed));
3644 +
3645 +struct squashfs_ipc_inode_header_1 {
3646 +       unsigned int            inode_type:4;
3647 +       unsigned int            mode:12; /* protection */
3648 +       unsigned int            uid:4; /* index into uid table */
3649 +       unsigned int            guid:4; /* index into guid table */
3650 +       unsigned int            type:4;
3651 +       unsigned int            offset:4;
3652 +} __attribute__ ((packed));
3653 +
3654 +struct squashfs_dev_inode_header_1 {
3655 +       unsigned int            inode_type:4;
3656 +       unsigned int            mode:12; /* protection */
3657 +       unsigned int            uid:4; /* index into uid table */
3658 +       unsigned int            guid:4; /* index into guid table */
3659 +       unsigned short          rdev;
3660 +} __attribute__ ((packed));
3661 +
3662 +struct squashfs_symlink_inode_header_1 {
3663 +       unsigned int            inode_type:4;
3664 +       unsigned int            mode:12; /* protection */
3665 +       unsigned int            uid:4; /* index into uid table */
3666 +       unsigned int            guid:4; /* index into guid table */
3667 +       unsigned short          symlink_size;
3668 +       char                    symlink[0];
3669 +} __attribute__ ((packed));
3670 +
3671 +struct squashfs_reg_inode_header_1 {
3672 +       unsigned int            inode_type:4;
3673 +       unsigned int            mode:12; /* protection */
3674 +       unsigned int            uid:4; /* index into uid table */
3675 +       unsigned int            guid:4; /* index into guid table */
3676 +       unsigned int            mtime;
3677 +       unsigned int            start_block;
3678 +       unsigned int            file_size:32;
3679 +       unsigned short          block_list[0];
3680 +} __attribute__ ((packed));
3681 +
3682 +struct squashfs_dir_inode_header_1 {
3683 +       unsigned int            inode_type:4;
3684 +       unsigned int            mode:12; /* protection */
3685 +       unsigned int            uid:4; /* index into uid table */
3686 +       unsigned int            guid:4; /* index into guid table */
3687 +       unsigned int            file_size:19;
3688 +       unsigned int            offset:13;
3689 +       unsigned int            mtime;
3690 +       unsigned int            start_block:24;
3691 +} __attribute__  ((packed));
3692 +
3693 +#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \
3694 +       SQUASHFS_MEMSET(s, d, n);\
3695 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3696 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3697 +       SQUASHFS_SWAP((s)->uid, d, 16, 4);\
3698 +       SQUASHFS_SWAP((s)->guid, d, 20, 4);
3699 +
3700 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
3701 +       SQUASHFS_SWAP_START\
3702 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
3703 +}
3704 +
3705 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
3706 +       SQUASHFS_SWAP_START\
3707 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3708 +                       sizeof(struct squashfs_ipc_inode_header_1));\
3709 +       SQUASHFS_SWAP((s)->type, d, 24, 4);\
3710 +       SQUASHFS_SWAP((s)->offset, d, 28, 4);\
3711 +}
3712 +
3713 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
3714 +       SQUASHFS_SWAP_START\
3715 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3716 +                       sizeof(struct squashfs_dev_inode_header_1));\
3717 +       SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
3718 +}
3719 +
3720 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
3721 +       SQUASHFS_SWAP_START\
3722 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3723 +                       sizeof(struct squashfs_symlink_inode_header_1));\
3724 +       SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
3725 +}
3726 +
3727 +#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
3728 +       SQUASHFS_SWAP_START\
3729 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3730 +                       sizeof(struct squashfs_reg_inode_header_1));\
3731 +       SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
3732 +       SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
3733 +       SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
3734 +}
3735 +
3736 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
3737 +       SQUASHFS_SWAP_START\
3738 +       SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
3739 +                       sizeof(struct squashfs_dir_inode_header_1));\
3740 +       SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
3741 +       SQUASHFS_SWAP((s)->offset, d, 43, 13);\
3742 +       SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
3743 +       SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
3744 +}
3745 +
3746 +#endif
3747 +
3748 +#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
3749 +
3750 +struct squashfs_dir_index_2 {
3751 +       unsigned int            index:27;
3752 +       unsigned int            start_block:29;
3753 +       unsigned char           size;
3754 +       unsigned char           name[0];
3755 +} __attribute__ ((packed));
3756 +
3757 +struct squashfs_base_inode_header_2 {
3758 +       unsigned int            inode_type:4;
3759 +       unsigned int            mode:12; /* protection */
3760 +       unsigned int            uid:8; /* index into uid table */
3761 +       unsigned int            guid:8; /* index into guid table */
3762 +} __attribute__ ((packed));
3763 +
3764 +struct squashfs_ipc_inode_header_2 {
3765 +       unsigned int            inode_type:4;
3766 +       unsigned int            mode:12; /* protection */
3767 +       unsigned int            uid:8; /* index into uid table */
3768 +       unsigned int            guid:8; /* index into guid table */
3769 +} __attribute__ ((packed));
3770 +
3771 +struct squashfs_dev_inode_header_2 {
3772 +       unsigned int            inode_type:4;
3773 +       unsigned int            mode:12; /* protection */
3774 +       unsigned int            uid:8; /* index into uid table */
3775 +       unsigned int            guid:8; /* index into guid table */
3776 +       unsigned short          rdev;
3777 +} __attribute__ ((packed));
3778 +
3779 +struct squashfs_symlink_inode_header_2 {
3780 +       unsigned int            inode_type:4;
3781 +       unsigned int            mode:12; /* protection */
3782 +       unsigned int            uid:8; /* index into uid table */
3783 +       unsigned int            guid:8; /* index into guid table */
3784 +       unsigned short          symlink_size;
3785 +       char                    symlink[0];
3786 +} __attribute__ ((packed));
3787 +
3788 +struct squashfs_reg_inode_header_2 {
3789 +       unsigned int            inode_type:4;
3790 +       unsigned int            mode:12; /* protection */
3791 +       unsigned int            uid:8; /* index into uid table */
3792 +       unsigned int            guid:8; /* index into guid table */
3793 +       unsigned int            mtime;
3794 +       unsigned int            start_block;
3795 +       unsigned int            fragment;
3796 +       unsigned int            offset;
3797 +       unsigned int            file_size:32;
3798 +       unsigned short          block_list[0];
3799 +} __attribute__ ((packed));
3800 +
3801 +struct squashfs_dir_inode_header_2 {
3802 +       unsigned int            inode_type:4;
3803 +       unsigned int            mode:12; /* protection */
3804 +       unsigned int            uid:8; /* index into uid table */
3805 +       unsigned int            guid:8; /* index into guid table */
3806 +       unsigned int            file_size:19;
3807 +       unsigned int            offset:13;
3808 +       unsigned int            mtime;
3809 +       unsigned int            start_block:24;
3810 +} __attribute__  ((packed));
3811 +
3812 +struct squashfs_ldir_inode_header_2 {
3813 +       unsigned int            inode_type:4;
3814 +       unsigned int            mode:12; /* protection */
3815 +       unsigned int            uid:8; /* index into uid table */
3816 +       unsigned int            guid:8; /* index into guid table */
3817 +       unsigned int            file_size:27;
3818 +       unsigned int            offset:13;
3819 +       unsigned int            mtime;
3820 +       unsigned int            start_block:24;
3821 +       unsigned int            i_count:16;
3822 +       struct squashfs_dir_index_2     index[0];
3823 +} __attribute__  ((packed));
3824 +
3825 +union squashfs_inode_header_2 {
3826 +       struct squashfs_base_inode_header_2     base;
3827 +       struct squashfs_dev_inode_header_2      dev;
3828 +       struct squashfs_symlink_inode_header_2  symlink;
3829 +       struct squashfs_reg_inode_header_2      reg;
3830 +       struct squashfs_dir_inode_header_2      dir;
3831 +       struct squashfs_ldir_inode_header_2     ldir;
3832 +       struct squashfs_ipc_inode_header_2      ipc;
3833 +};
3834 +
3835 +struct squashfs_dir_header_2 {
3836 +       unsigned int            count:8;
3837 +       unsigned int            start_block:24;
3838 +} __attribute__ ((packed));
3839 +
3840 +struct squashfs_dir_entry_2 {
3841 +       unsigned int            offset:13;
3842 +       unsigned int            type:3;
3843 +       unsigned int            size:8;
3844 +       char                    name[0];
3845 +} __attribute__ ((packed));
3846 +
3847 +struct squashfs_fragment_entry_2 {
3848 +       unsigned int            start_block;
3849 +       unsigned int            size;
3850 +} __attribute__ ((packed));
3851 +
3852 +#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3853 +       SQUASHFS_MEMSET(s, d, n);\
3854 +       SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
3855 +       SQUASHFS_SWAP((s)->mode, d, 4, 12);\
3856 +       SQUASHFS_SWAP((s)->uid, d, 16, 8);\
3857 +       SQUASHFS_SWAP((s)->guid, d, 24, 8);\
3858 +
3859 +#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
3860 +       SQUASHFS_SWAP_START\
3861 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
3862 +}
3863 +
3864 +#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
3865 +       SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
3866 +
3867 +#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
3868 +       SQUASHFS_SWAP_START\
3869 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3870 +                       sizeof(struct squashfs_dev_inode_header_2)); \
3871 +       SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
3872 +}
3873 +
3874 +#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
3875 +       SQUASHFS_SWAP_START\
3876 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3877 +                       sizeof(struct squashfs_symlink_inode_header_2));\
3878 +       SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
3879 +}
3880 +
3881 +#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
3882 +       SQUASHFS_SWAP_START\
3883 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3884 +                       sizeof(struct squashfs_reg_inode_header_2));\
3885 +       SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
3886 +       SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
3887 +       SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
3888 +       SQUASHFS_SWAP((s)->offset, d, 128, 32);\
3889 +       SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
3890 +}
3891 +
3892 +#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
3893 +       SQUASHFS_SWAP_START\
3894 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3895 +                       sizeof(struct squashfs_dir_inode_header_2));\
3896 +       SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
3897 +       SQUASHFS_SWAP((s)->offset, d, 51, 13);\
3898 +       SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
3899 +       SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
3900 +}
3901 +
3902 +#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
3903 +       SQUASHFS_SWAP_START\
3904 +       SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
3905 +                       sizeof(struct squashfs_ldir_inode_header_2));\
3906 +       SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
3907 +       SQUASHFS_SWAP((s)->offset, d, 59, 13);\
3908 +       SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
3909 +       SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
3910 +       SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
3911 +}
3912 +
3913 +#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
3914 +       SQUASHFS_SWAP_START\
3915 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
3916 +       SQUASHFS_SWAP((s)->index, d, 0, 27);\
3917 +       SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
3918 +       SQUASHFS_SWAP((s)->size, d, 56, 8);\
3919 +}
3920 +#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
3921 +       SQUASHFS_SWAP_START\
3922 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
3923 +       SQUASHFS_SWAP((s)->count, d, 0, 8);\
3924 +       SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
3925 +}
3926 +
3927 +#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
3928 +       SQUASHFS_SWAP_START\
3929 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
3930 +       SQUASHFS_SWAP((s)->offset, d, 0, 13);\
3931 +       SQUASHFS_SWAP((s)->type, d, 13, 3);\
3932 +       SQUASHFS_SWAP((s)->size, d, 16, 8);\
3933 +}
3934 +
3935 +#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
3936 +       SQUASHFS_SWAP_START\
3937 +       SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
3938 +       SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
3939 +       SQUASHFS_SWAP((s)->size, d, 32, 32);\
3940 +}
3941 +
3942 +#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
3943 +
3944 +/* fragment and fragment table defines */
3945 +#define SQUASHFS_FRAGMENT_BYTES_2(A)   (A * sizeof(struct squashfs_fragment_entry_2))
3946 +
3947 +#define SQUASHFS_FRAGMENT_INDEX_2(A)   (SQUASHFS_FRAGMENT_BYTES_2(A) / \
3948 +                                       SQUASHFS_METADATA_SIZE)
3949 +
3950 +#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A)    (SQUASHFS_FRAGMENT_BYTES_2(A) % \
3951 +                                               SQUASHFS_METADATA_SIZE)
3952 +
3953 +#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \
3954 +                                       SQUASHFS_METADATA_SIZE - 1) / \
3955 +                                       SQUASHFS_METADATA_SIZE)
3956 +
3957 +#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A)     (SQUASHFS_FRAGMENT_INDEXES_2(A) *\
3958 +                                               sizeof(int))
3959 +
3960 +#endif
3961 +
3962 +#ifdef __KERNEL__
3963 +
3964 +/*
3965 + * macros used to swap each structure entry, taking into account
3966 + * bitfields and different bitfield placing conventions on differing
3967 + * architectures
3968 + */
3969 +
3970 +#include <asm/byteorder.h>
3971 +
3972 +#ifdef __BIG_ENDIAN
3973 +       /* convert from little endian to big endian */
3974 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3975 +               tbits, b_pos)
3976 +#else
3977 +       /* convert from big endian to little endian */
3978 +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
3979 +               tbits, 64 - tbits - b_pos)
3980 +#endif
3981 +
3982 +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
3983 +       b_pos = pos % 8;\
3984 +       val = 0;\
3985 +       s = (unsigned char *)p + (pos / 8);\
3986 +       d = ((unsigned char *) &val) + 7;\
3987 +       for(bits = 0; bits < (tbits + b_pos); bits += 8) \
3988 +               *d-- = *s++;\
3989 +       value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
3990 +}
3991 +
3992 +#define SQUASHFS_MEMSET(s, d, n)       memset(s, 0, n);
3993 +
3994 +#endif
3995 +#endif
3996 --- /dev/null
3997 +++ b/include/linux/squashfs_fs_i.h
3998 @@ -0,0 +1,45 @@
3999 +#ifndef SQUASHFS_FS_I
4000 +#define SQUASHFS_FS_I
4001 +/*
4002 + * Squashfs
4003 + *
4004 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
4005 + * Phillip Lougher <phillip@lougher.org.uk>
4006 + *
4007 + * This program is free software; you can redistribute it and/or
4008 + * modify it under the terms of the GNU General Public License
4009 + * as published by the Free Software Foundation; either version 2,
4010 + * or (at your option) any later version.
4011 + *
4012 + * This program is distributed in the hope that it will be useful,
4013 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4014 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
4015 + * GNU General Public License for more details.
4016 + *
4017 + * You should have received a copy of the GNU General Public License
4018 + * along with this program; if not, write to the Free Software
4019 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
4020 + *
4021 + * squashfs_fs_i.h
4022 + */
4023 +
4024 +struct squashfs_inode_info {
4025 +       long long       start_block;
4026 +       unsigned int    offset;
4027 +       union {
4028 +               struct {
4029 +                       long long       fragment_start_block;
4030 +                       unsigned int    fragment_size;
4031 +                       unsigned int    fragment_offset;
4032 +                       long long       block_list_start;
4033 +               } s1;
4034 +               struct {
4035 +                       long long       directory_index_start;
4036 +                       unsigned int    directory_index_offset;
4037 +                       unsigned int    directory_index_count;
4038 +                       unsigned int    parent_inode;
4039 +               } s2;
4040 +       } u;
4041 +       struct inode    vfs_inode;
4042 +};
4043 +#endif
4044 --- /dev/null
4045 +++ b/include/linux/squashfs_fs_sb.h
4046 @@ -0,0 +1,74 @@
4047 +#ifndef SQUASHFS_FS_SB
4048 +#define SQUASHFS_FS_SB
4049 +/*
4050 + * Squashfs
4051 + *
4052 + * Copyright (c) 2002, 2003, 2004, 2005, 2006
4053 + * Phillip Lougher <phillip@lougher.org.uk>
4054 + *
4055 + * This program is free software; you can redistribute it and/or
4056 + * modify it under the terms of the GNU General Public License
4057 + * as published by the Free Software Foundation; either version 2,
4058 + * or (at your option) any later version.
4059 + *
4060 + * This program is distributed in the hope that it will be useful,
4061 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4062 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
4063 + * GNU General Public License for more details.
4064 + *
4065 + * You should have received a copy of the GNU General Public License
4066 + * along with this program; if not, write to the Free Software
4067 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
4068 + *
4069 + * squashfs_fs_sb.h
4070 + */
4071 +
4072 +#include <linux/squashfs_fs.h>
4073 +
4074 +struct squashfs_cache {
4075 +       long long       block;
4076 +       int             length;
4077 +       long long       next_index;
4078 +       char            *data;
4079 +};
4080 +
4081 +struct squashfs_fragment_cache {
4082 +       long long       block;
4083 +       int             length;
4084 +       unsigned int    locked;
4085 +       char            *data;
4086 +};
4087 +
4088 +struct squashfs_sb_info {
4089 +       struct squashfs_super_block     sblk;
4090 +       int                     devblksize;
4091 +       int                     devblksize_log2;
4092 +       int                     swap;
4093 +       struct squashfs_cache   *block_cache;
4094 +       struct squashfs_fragment_cache  *fragment;
4095 +       int                     next_cache;
4096 +       int                     next_fragment;
4097 +       int                     next_meta_index;
4098 +       unsigned int            *uid;
4099 +       unsigned int            *guid;
4100 +       long long               *fragment_index;
4101 +       unsigned int            *fragment_index_2;
4102 +       unsigned int            read_size;
4103 +       char                    *read_data;
4104 +       char                    *read_page;
4105 +       struct semaphore        read_data_mutex;
4106 +       struct semaphore        read_page_mutex;
4107 +       struct semaphore        block_cache_mutex;
4108 +       struct semaphore        fragment_mutex;
4109 +       struct semaphore        meta_index_mutex;
4110 +       wait_queue_head_t       waitq;
4111 +       wait_queue_head_t       fragment_wait_queue;
4112 +       struct meta_index       *meta_index;
4113 +       struct inode            *(*iget)(struct super_block *s,  squashfs_inode_t \
4114 +                               inode);
4115 +       long long               (*read_blocklist)(struct inode *inode, int \
4116 +                               index, int readahead_blks, char *block_list, \
4117 +                               unsigned short **block_p, unsigned int *bsize);
4118 +       int                     (*read_fragment_index_table)(struct super_block *s);
4119 +};
4120 +#endif
4121 --- a/init/do_mounts_rd.c
4122 +++ b/init/do_mounts_rd.c
4123 @@ -5,6 +5,7 @@
4124  #include <linux/ext2_fs.h>
4125  #include <linux/romfs_fs.h>
4126  #include <linux/cramfs_fs.h>
4127 +#include <linux/squashfs_fs.h>
4128  #include <linux/initrd.h>
4129  #include <linux/string.h>
4130
4131 @@ -39,6 +40,7 @@ static int __init crd_load(int in_fd, in
4132   * numbers could not be found.
4133   *
4134   * We currently check for the following magic numbers:
4135 + *      squashfs
4136   *     minix
4137   *     ext2
4138   *     romfs
4139 @@ -53,6 +55,7 @@ identify_ramdisk_image(int fd, int start
4140         struct ext2_super_block *ext2sb;
4141         struct romfs_super_block *romfsb;
4142         struct cramfs_super *cramfsb;
4143 +       struct squashfs_super_block *squashfsb;
4144         int nblocks = -1;
4145         unsigned char *buf;
4146
4147 @@ -64,6 +67,7 @@ identify_ramdisk_image(int fd, int start
4148         ext2sb = (struct ext2_super_block *) buf;
4149         romfsb = (struct romfs_super_block *) buf;
4150         cramfsb = (struct cramfs_super *) buf;
4151 +       squashfsb = (struct squashfs_super_block *) buf;
4152         memset(buf, 0xe5, size);
4153
4154         /*
4155 @@ -101,6 +105,15 @@ identify_ramdisk_image(int fd, int start
4156                 goto done;
4157         }
4158
4159 +       /* squashfs is at block zero too */
4160 +       if (squashfsb->s_magic == SQUASHFS_MAGIC) {
4161 +               printk(KERN_NOTICE
4162 +                      "RAMDISK: squashfs filesystem found at block %d\n",
4163 +                      start_block);
4164 +               nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
4165 +               goto done;
4166 +       }
4167 +
4168         /*
4169          * Read block 1 to test for minix and ext2 superblock
4170          */