ldiskfs/kernel_patches/patches/ext4-big-endian-check-2.6-rhel5.patch

   1 Index: linux-2.6.18-128.1.6/fs/ext4/super.c
   2 ===================================================================
   3 --- linux-2.6.18-128.1.6.orig/fs/ext4/super.c
   4 +++ linux-2.6.18-128.1.6/fs/ext4/super.c
   5 @@ -70,6 +70,8 @@ struct page *ext4_zero_page;
   6
   7  struct proc_dir_entry *proc_root_ext4;
   8
   9 +static int bigendian_extents;
  10 +
  11  ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
  12                                struct ext4_group_desc *bg)
  13  {
  14 @@ -1222,7 +1224,7 @@ enum {
  15         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
  16         Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
  17         Opt_mballoc, Opt_nomballoc, Opt_stripe,
  18 -       Opt_iopen, Opt_noiopen, Opt_iopen_nopriv,
  19 +       Opt_iopen, Opt_noiopen, Opt_iopen_nopriv, Opt_bigendian_extents,
  20  };
  21
  22  static match_table_t tokens = {
  23 @@ -1284,6 +1286,7 @@ static match_table_t tokens = {
  24         {Opt_nomballoc, "nomballoc"},
  25         {Opt_stripe, "stripe=%u"},
  26         {Opt_resize, "resize"},
  27 +       {Opt_bigendian_extents, "bigendian_extents"},
  28         {Opt_err, NULL},
  29  };
  30
  31 @@ -1682,6 +1685,9 @@ clear_qf_name:
  32                                 return 0;
  33                         sbi->s_stripe = option;
  34                         break;
  35 +               case Opt_bigendian_extents:
  36 +                       bigendian_extents = 1;
  37 +                       break;
  38                 default:
  39                         printk(KERN_ERR
  40                                "EXT4-fs: Unrecognized mount option \"%s\" "
  41 @@ -2561,6 +2567,15 @@ static int ext4_fill_super(struct super_
  42                 goto failed_mount;
  43         }
  44
  45 +#ifdef __BIG_ENDIAN
  46 +       if (bigendian_extents == 0) {
  47 +               printk(KERN_ERR "EXT4-fs: extents feature is not guaranteed to "
  48 +                      "work on big-endian systems. Use \"bigendian_extents\" "
  49 +                      "mount option to override.\n");
  50 +               goto failed_mount;
  51 +       }
  52 +#endif
  53 +
  54         bgl_lock_init(&sbi->s_blockgroup_lock);
  55
  56         sbi->s_last_alloc_group = -1;