target/linux/generic-2.6/patches/003-squashfs_lzma.patch

   1 diff -urN linux-2.6.21.1.old/fs/squashfs/inode.c linux-2.6.21.1.dev/fs/squashfs/inode.c
   2 --- linux-2.6.21.1.old/fs/squashfs/inode.c      2007-05-26 19:03:45.499713896 +0200
   3 +++ linux-2.6.21.1.dev/fs/squashfs/inode.c      2007-05-26 19:07:27.951896024 +0200
   4 @@ -4,6 +4,9 @@
   5   * Copyright (c) 2002, 2003, 2004, 2005, 2006
   6   * Phillip Lougher <phillip@lougher.org.uk>
   7   *
   8 + * LZMA decompressor support added by Oleg I. Vdovikin
   9 + * Copyright (c) 2005 Oleg I.Vdovikin <oleg@cs.msu.su>
  10 + *
  11   * This program is free software; you can redistribute it and/or
  12   * modify it under the terms of the GNU General Public License
  13   * as published by the Free Software Foundation; either version 2,
  14 @@ -21,6 +24,7 @@
  15   * inode.c
  16   */
  17
  18 +#define SQUASHFS_LZMA
  19  #include <linux/types.h>
  20  #include <linux/squashfs_fs.h>
  21  #include <linux/module.h>
  22 @@ -44,6 +48,19 @@
  23
  24  #include "squashfs.h"
  25
  26 +#ifdef SQUASHFS_LZMA
  27 +#include <linux/LzmaDecode.h>
  28 +
  29 +/* default LZMA settings, should be in sync with mksquashfs */
  30 +#define LZMA_LC 3
  31 +#define LZMA_LP 0
  32 +#define LZMA_PB 2
  33 +
  34 +#define LZMA_WORKSPACE_SIZE ((LZMA_BASE_SIZE + \
  35 +      (LZMA_LIT_SIZE << (LZMA_LC + LZMA_LP))) * sizeof(CProb))
  36 +
  37 +#endif
  38 +
  39  static void squashfs_put_super(struct super_block *);
  40  static int squashfs_statfs(struct dentry *, struct kstatfs *);
  41  static int squashfs_symlink_readpage(struct file *file, struct page *page);
  42 @@ -64,7 +81,11 @@
  43                         const char *, void *, struct vfsmount *);
  44
  45
  46 +#ifdef SQUASHFS_LZMA
  47 +static unsigned char lzma_workspace[LZMA_WORKSPACE_SIZE];
  48 +#else
  49  static z_stream stream;
  50 +#endif
  51
  52  static struct file_system_type squashfs_fs_type = {
  53         .owner = THIS_MODULE,
  54 @@ -249,6 +270,15 @@
  55         if (compressed) {
  56                 int zlib_err;
  57
  58 +#ifdef SQUASHFS_LZMA
  59 +               if ((zlib_err = LzmaDecode(lzma_workspace,
  60 +                       LZMA_WORKSPACE_SIZE, LZMA_LC, LZMA_LP, LZMA_PB,
  61 +                       c_buffer, c_byte, buffer, msblk->read_size, &bytes)) != LZMA_RESULT_OK)
  62 +               {
  63 +                       ERROR("lzma returned unexpected result 0x%x\n", zlib_err);
  64 +                       bytes = 0;
  65 +               }
  66 +#else
  67                 stream.next_in = c_buffer;
  68                 stream.avail_in = c_byte;
  69                 stream.next_out = buffer;
  70 @@ -263,7 +293,7 @@
  71                         bytes = 0;
  72                 } else
  73                         bytes = stream.total_out;
  74 -
  75 +#endif
  76                 up(&msblk->read_data_mutex);
  77         }
  78
  79 @@ -2045,15 +2075,19 @@
  80         printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
  81                 "Phillip Lougher\n");
  82
  83 +#ifndef SQUASHFS_LZMA
  84         if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
  85                 ERROR("Failed to allocate zlib workspace\n");
  86                 destroy_inodecache();
  87                 err = -ENOMEM;
  88                 goto out;
  89         }
  90 +#endif
  91
  92         if ((err = register_filesystem(&squashfs_fs_type))) {
  93 +#ifndef SQUASHFS_LZMA
  94                 vfree(stream.workspace);
  95 +#endif
  96                 destroy_inodecache();
  97         }
  98
  99 @@ -2064,7 +2098,9 @@
 100
 101  static void __exit exit_squashfs_fs(void)
 102  {
 103 +#ifndef SQUASHFS_LZMA
 104         vfree(stream.workspace);
 105 +#endif
 106         unregister_filesystem(&squashfs_fs_type);
 107         destroy_inodecache();
 108  }