ldiskfs/kernel_patches/patches/sles11sp2/ext4-force_over_128tb.patch

   1 diff -r -u linux-stage.orig/fs/ext4/super.c linux-stage/fs/ext4/super.c
   2 --- linux-stage.orig/fs/ext4/super.c    2012-12-31 12:55:18.000000000 -0500
   3 +++ linux-stage/fs/ext4/super.c 2012-12-31 12:56:14.000000000 -0500
   4 @@ -59,6 +59,8 @@
   5  static struct mutex ext4_li_mtx;
   6  static struct ext4_features *ext4_feat;
   7
   8 +static int force_over_128tb;
   9 +
  10  static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  11                              unsigned long journal_devnum);
  12  static int ext4_commit_super(struct super_block *sb, int sync);
  13 @@ -1298,7 +1300,7 @@
  14         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
  15         Opt_inode_readahead_blks, Opt_journal_ioprio,
  16         Opt_dioread_nolock, Opt_dioread_lock,
  17 -       Opt_mballoc, Opt_bigendian_extents,
  18 +       Opt_mballoc, Opt_bigendian_extents, Opt_force_over_128tb,
  19         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
  20  };
  21
  22 @@ -1374,6 +1376,7 @@
  23         {Opt_dioread_nolock, "dioread_nolock"},
  24         {Opt_dioread_lock, "dioread_lock"},
  25         {Opt_bigendian_extents, "bigendian_extents"},
  26 +       {Opt_force_over_128tb, "force_over_128tb"},
  27         {Opt_mballoc, "mballoc"},
  28         {Opt_discard, "discard"},
  29         {Opt_nodiscard, "nodiscard"},
  30 @@ -1879,6 +1882,9 @@
  31                         break;
  32                 case Opt_mballoc:
  33                         break;
  34 +               case Opt_force_over_128tb:
  35 +                       force_over_128tb = 1;
  36 +                       break;
  37                 default:
  38                         ext4_msg(sb, KERN_ERR,
  39                                "Unrecognized mount option \"%s\" "
  40 @@ -3394,6 +3400,16 @@
  41                 goto failed_mount;
  42         }
  43
  44 +       if (ext4_blocks_count(es) > (8ULL << 32)) {
  45 +               if (force_over_128tb == 0) {
  46 +                       printk(KERN_ERR "EXT4-fs does not support filesystems "
  47 +                              "greater than 128TB and can cause data corruption."
  48 +                              "Use \"force_over_128tb\" mount option to override."
  49 +                              "\n");
  50 +                       goto failed_mount;
  51 +               }
  52 +       }
  53 +
  54         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
  55                 goto cantfind_ext4;
  56