ldiskfs/kernel_patches/patches/rhel6.3/ext4-big-endian-check-2.6.patch

   1 Index: linux-stage/fs/ext4/super.c
   2 ===================================================================
   3 --- linux-stage.orig/fs/ext4/super.c    2011-03-11 15:27:08.000000000 +0800
   4 +++ linux-stage/fs/ext4/super.c 2011-03-11 15:29:41.023089829 +0800
   5 @@ -72,6 +72,8 @@
   6  static int ext4_freeze(struct super_block *sb);
   7
   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 @@ -1492,7 +1494,7 @@
  15         Opt_stripe, Opt_delalloc, Opt_nodelalloc,
  16         Opt_block_validity, Opt_noblock_validity,
  17         Opt_inode_readahead_blks, Opt_journal_ioprio,
  18 -       Opt_mballoc,
  19 +       Opt_mballoc, Opt_bigendian_extents,
  20         Opt_discard, Opt_nodiscard,
  21         Opt_init_inode_table, Opt_noinit_inode_table,
  22  };
  23 @@ -1559,6 +1561,7 @@
  24         {Opt_auto_da_alloc, "auto_da_alloc=%u"},
  25         {Opt_auto_da_alloc, "auto_da_alloc"},
  26         {Opt_noauto_da_alloc, "noauto_da_alloc"},
  27 +       {Opt_bigendian_extents, "bigendian_extents"},
  28         {Opt_mballoc, "mballoc"},
  29         {Opt_discard, "discard"},
  30         {Opt_nodiscard, "nodiscard"},
  31 @@ -1996,6 +1999,9 @@
  32                         break;
  33                 case Opt_mballoc:
  34                         break;
  35 +               case Opt_bigendian_extents:
  36 +                       bigendian_extents = 1;
  37 +                       break;
  38                 case Opt_discard:
  39                         set_opt(sbi->s_mount_opt, DISCARD);
  40                         break;
  41 @@ -3073,6 +3079,16 @@
  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 +
  55  #ifdef CONFIG_PROC_FS
  56         if (ext4_proc_root)
  57                 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);