ldiskfs/kernel_patches/patches/ext4-force_over_128tb-rhel6.patch

   1 Index: linux-stage/fs/ext4/super.c
   2 ===================================================================
   3 --- linux-stage.orig/fs/ext4/super.c    2011-03-11 15:35:15.680343230 +0800
   4 +++ linux-stage/fs/ext4/super.c 2011-03-11 15:44:45.037632078 +0800
   5 @@ -55,6 +55,8 @@
   6  struct proc_dir_entry *ext4_proc_root;
   7  static struct kset *ext4_kset;
   8
   9 +static int force_over_128tb;
  10 +
  11  static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  12                              unsigned long journal_devnum);
  13  static int ext4_commit_super(struct super_block *sb, int sync);
  14 @@ -1494,7 +1496,7 @@
  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, Opt_bigendian_extents,
  19 +       Opt_mballoc, Opt_bigendian_extents, Opt_force_over_128tb,
  20         Opt_discard, Opt_nodiscard,
  21         Opt_init_inode_table, Opt_noinit_inode_table,
  22  };
  23 @@ -1562,6 +1564,7 @@
  24         {Opt_auto_da_alloc, "auto_da_alloc"},
  25         {Opt_noauto_da_alloc, "noauto_da_alloc"},
  26         {Opt_bigendian_extents, "bigendian_extents"},
  27 +       {Opt_force_over_128tb, "force_over_128tb"},
  28         {Opt_mballoc, "mballoc"},
  29         {Opt_discard, "discard"},
  30         {Opt_nodiscard, "nodiscard"},
  31 @@ -2008,6 +2011,9 @@
  32                         break;
  33                 case Opt_mballoc:
  34                         break;
  35 +               case Opt_force_over_128tb:
  36 +                       force_over_128tb = 1;
  37 +                       break;
  38                 default:
  39                         ext4_msg(sb, KERN_ERR,
  40                                "Unrecognized mount option \"%s\" "
  41 @@ -3031,6 +3037,16 @@
  42                 goto failed_mount;
  43         }
  44
  45 +       if (ext4_blocks_count(es) > (8ULL << 32)) {
  46 +               if (force_over_128tb == 0) {
  47 +                       printk(KERN_ERR "EXT4-fs does not support filesystems "
  48 +                              "greater than 128TB and can cause data corruption."
  49 +                              "Use \"force_over_128tb\" mount option to override."
  50 +                              "\n");
  51 +                       goto failed_mount;
  52 +               }
  53 +       }
  54 +
  55         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
  56                 goto cantfind_ext4;
  57