target/linux/generic-2.6/patches-2.6.30/053-squashfs_lzma.patch

   1 --- a/fs/squashfs/Kconfig
   2 +++ b/fs/squashfs/Kconfig
   3 @@ -2,7 +2,6 @@ config SQUASHFS
   4         tristate "SquashFS 4.0 - Squashed file system support"
   5         depends on BLOCK
   6         select CRYPTO
   7 -       select CRYPTO_ZLIB
   8         help
   9           Saying Y here includes support for SquashFS 4.0 (a Compressed
  10           Read-Only File System).  Squashfs is a highly compressed read-only
  11 @@ -37,6 +36,26 @@ config SQUASHFS_EMBEDDED
  12
  13           If unsure, say N.
  14
  15 +config SQUASHFS_SUPPORT_ZLIB
  16 +       bool
  17 +       prompt "Support ZLIB compression" if SQUASHFS_SUPPORT_LZMA
  18 +       depends on SQUASHFS
  19 +       select CRYPTO_ZLIB
  20 +       default y
  21 +       help
  22 +         ZLIB is the default compression used in squashfs. If you are
  23 +         using LZMA compression instead, you can remove support for ZLIB
  24 +         entirely.
  25 +
  26 +config SQUASHFS_SUPPORT_LZMA
  27 +       bool "Support LZMA compression"
  28 +       depends on SQUASHFS
  29 +       select CRYPTO_UNLZMA
  30 +       help
  31 +         By default SquashFS uses ZLIB compression, however (if your tools
  32 +         support it, you can use LZMA instead, which saves space.
  33 +
  34 +
  35  config SQUASHFS_FRAGMENT_CACHE_SIZE
  36         int "Number of fragments cached" if SQUASHFS_EMBEDDED
  37         depends on SQUASHFS
  38 --- a/fs/squashfs/squashfs_fs.h
  39 +++ b/fs/squashfs/squashfs_fs.h
  40 @@ -212,6 +212,7 @@ struct meta_index {
  41   * definitions for structures on disk
  42   */
  43  #define ZLIB_COMPRESSION        1
  44 +#define LZMA_COMPRESSION        2
  45
  46  struct squashfs_super_block {
  47         __le32                  s_magic;
  48 --- a/fs/squashfs/super.c
  49 +++ b/fs/squashfs/super.c
  50 @@ -47,13 +47,76 @@
  51  #include "squashfs.h"
  52
  53
  54 -#define SQUASHFS_CRYPTO_ALG    "zlib"
  55 +static int squashfs_setup_zlib(struct squashfs_sb_info *msblk)
  56 +{
  57 +       int err = -EOPNOTSUPP;
  58 +
  59 +#ifdef CONFIG_SQUASHFS_SUPPORT_ZLIB
  60 +       struct {
  61 +               struct nlattr nla;
  62 +               int val;
  63 +       } params = {
  64 +               .nla = {
  65 +                       .nla_len        = nla_attr_size(sizeof(int)),
  66 +                       .nla_type       = ZLIB_DECOMP_WINDOWBITS,
  67 +               },
  68 +               .val                    = DEF_WBITS,
  69 +       };
  70 +
  71 +       msblk->tfm = crypto_alloc_pcomp("zlib", 0,
  72 +                                       CRYPTO_ALG_ASYNC);
  73 +       if (IS_ERR(msblk->tfm)) {
  74 +               ERROR("Failed to load zlib crypto module\n");
  75 +               return PTR_ERR(msblk->tfm);
  76 +       }
  77 +
  78 +       err = crypto_decompress_setup(msblk->tfm, &params, sizeof(params));
  79 +       if (err) {
  80 +               ERROR("Failed to set up decompression parameters\n");
  81 +               crypto_free_pcomp(msblk->tfm);
  82 +       }
  83 +#endif
  84 +
  85 +       return err;
  86 +}
  87 +
  88 +static int squashfs_setup_lzma(struct squashfs_sb_info *msblk)
  89 +{
  90 +       int err = -EOPNOTSUPP;
  91 +
  92 +#ifdef CONFIG_SQUASHFS_SUPPORT_LZMA
  93 +       struct {
  94 +               struct nlattr nla;
  95 +               int val;
  96 +       } params = {
  97 +               .nla = {
  98 +                       .nla_len        = nla_attr_size(sizeof(int)),
  99 +                       .nla_type       = UNLZMA_DECOMP_OUT_BUFFERS,
 100 +               },
 101 +               .val = (msblk->block_size / PAGE_CACHE_SIZE) + 1
 102 +       };
 103
 104 +       msblk->tfm = crypto_alloc_pcomp("lzma", 0,
 105 +                                       CRYPTO_ALG_ASYNC);
 106 +       if (IS_ERR(msblk->tfm)) {
 107 +               ERROR("Failed to load lzma crypto module\n");
 108 +               return PTR_ERR(msblk->tfm);
 109 +       }
 110 +
 111 +       err = crypto_decompress_setup(msblk->tfm, &params, sizeof(params));
 112 +       if (err) {
 113 +               ERROR("Failed to set up decompression parameters\n");
 114 +               crypto_free_pcomp(msblk->tfm);
 115 +       }
 116 +#endif
 117 +
 118 +       return err;
 119 +}
 120
 121  static struct file_system_type squashfs_fs_type;
 122  static struct super_operations squashfs_super_ops;
 123
 124 -static int supported_squashfs_filesystem(short major, short minor, short comp)
 125 +static int supported_squashfs_filesystem(short major, short minor)
 126  {
 127         if (major < SQUASHFS_MAJOR) {
 128                 ERROR("Major/Minor mismatch, older Squashfs %d.%d "
 129 @@ -66,9 +129,6 @@ static int supported_squashfs_filesystem
 130                 return -EINVAL;
 131         }
 132
 133 -       if (comp != ZLIB_COMPRESSION)
 134 -               return -EINVAL;
 135 -
 136         return 0;
 137  }
 138
 139 @@ -83,16 +143,6 @@ static int squashfs_fill_super(struct su
 140         unsigned short flags;
 141         unsigned int fragments;
 142         u64 lookup_table_start;
 143 -       struct {
 144 -               struct nlattr nla;
 145 -               int val;
 146 -       } params = {
 147 -               .nla = {
 148 -                       .nla_len        = nla_attr_size(sizeof(int)),
 149 -                       .nla_type       = ZLIB_DECOMP_WINDOWBITS,
 150 -               },
 151 -               .val                    = DEF_WBITS,
 152 -       };
 153         int err;
 154
 155         TRACE("Entered squashfs_fill_superblock\n");
 156 @@ -104,21 +154,6 @@ static int squashfs_fill_super(struct su
 157         }
 158         msblk = sb->s_fs_info;
 159
 160 -       msblk->tfm = crypto_alloc_pcomp(SQUASHFS_CRYPTO_ALG, 0,
 161 -                                       CRYPTO_ALG_ASYNC);
 162 -       if (IS_ERR(msblk->tfm)) {
 163 -               ERROR("Failed to load %s crypto module\n",
 164 -                     SQUASHFS_CRYPTO_ALG);
 165 -               err = PTR_ERR(msblk->tfm);
 166 -               goto failed_pcomp;
 167 -       }
 168 -
 169 -       err = crypto_decompress_setup(msblk->tfm, &params, sizeof(params));
 170 -       if (err) {
 171 -               ERROR("Failed to set up decompression parameters\n");
 172 -               goto failure;
 173 -       }
 174 -
 175         sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
 176         if (sblk == NULL) {
 177                 ERROR("Failed to allocate squashfs_super_block\n");
 178 @@ -156,10 +191,28 @@ static int squashfs_fill_super(struct su
 179                 goto failed_mount;
 180         }
 181
 182 +       /* Check block size for sanity */
 183 +       msblk->block_size = le32_to_cpu(sblk->block_size);
 184 +       if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
 185 +               goto failed_mount;
 186 +
 187         /* Check the MAJOR & MINOR versions and compression type */
 188         err = supported_squashfs_filesystem(le16_to_cpu(sblk->s_major),
 189 -                       le16_to_cpu(sblk->s_minor),
 190 -                       le16_to_cpu(sblk->compression));
 191 +                       le16_to_cpu(sblk->s_minor));
 192 +       if (err < 0)
 193 +               goto failed_mount;
 194 +
 195 +       switch(le16_to_cpu(sblk->compression)) {
 196 +       case ZLIB_COMPRESSION:
 197 +               err = squashfs_setup_zlib(msblk);
 198 +               break;
 199 +       case LZMA_COMPRESSION:
 200 +               err = squashfs_setup_lzma(msblk);
 201 +               break;
 202 +       default:
 203 +               err = -EINVAL;
 204 +               break;
 205 +       }
 206         if (err < 0)
 207                 goto failed_mount;
 208
 209 @@ -179,11 +232,6 @@ static int squashfs_fill_super(struct su
 210                         i_size_read(sb->s_bdev->bd_inode))
 211                 goto failed_mount;
 212
 213 -       /* Check block size for sanity */
 214 -       msblk->block_size = le32_to_cpu(sblk->block_size);
 215 -       if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
 216 -               goto failed_mount;
 217 -
 218         /*
 219          * Check the system page size is not larger than the filesystem
 220          * block size (by default 128K).  This is currently not supported.
 221 @@ -315,21 +363,16 @@ allocate_root:
 222         return 0;
 223
 224  failed_mount:
 225 +       if (msblk->tfm)
 226 +               crypto_free_pcomp(msblk->tfm);
 227         squashfs_cache_delete(msblk->block_cache);
 228         squashfs_cache_delete(msblk->fragment_cache);
 229         squashfs_cache_delete(msblk->read_page);
 230         kfree(msblk->inode_lookup_table);
 231         kfree(msblk->fragment_index);
 232         kfree(msblk->id_table);
 233 -       crypto_free_pcomp(msblk->tfm);
 234 -       kfree(sb->s_fs_info);
 235 -       sb->s_fs_info = NULL;
 236         kfree(sblk);
 237 -       return err;
 238 -
 239  failure:
 240 -       crypto_free_pcomp(msblk->tfm);
 241 -failed_pcomp:
 242         kfree(sb->s_fs_info);
 243         sb->s_fs_info = NULL;
 244         return err;