ldiskfs/kernel_patches/patches/ext4-force_over_16tb-rhel5.patch

   1 Index: linux-2.6.18-164.6.1/fs/ext4/super.c
   2 ===================================================================
   3 --- linux-2.6.18-164.6.1.orig/fs/ext4/super.c
   4 +++ linux-2.6.18-164.6.1/fs/ext4/super.c
   5 @@ -51,6 +51,8 @@
   6
   7  struct proc_dir_entry *ext4_proc_root;
   8
   9 +static int force_over_16tb;
  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,
  14 @@ -1343,6 +1345,7 @@ enum {
  15         Opt_stripe, Opt_delalloc, Opt_nodelalloc,
  16         Opt_inode_readahead_blks, Opt_journal_ioprio,
  17         Opt_iopen, Opt_noiopen, Opt_iopen_nopriv, Opt_bigendian_extents,
  18 +       Opt_force_over_16tb,
  19  };
  20
  21  static match_table_t tokens = {
  22 @@ -1410,6 +1413,7 @@ static match_table_t tokens = {
  23         {Opt_auto_da_alloc, "auto_da_alloc"},
  24         {Opt_noauto_da_alloc, "noauto_da_alloc"},
  25         {Opt_bigendian_extents, "bigendian_extents"},
  26 +       {Opt_force_over_16tb, "force_over_16tb"},
  27         {Opt_err, NULL},
  28  };
  29
  30 @@ -1837,6 +1841,9 @@ set_qf_format:
  31                         break;
  32                 case Opt_mballoc:
  33                         break;
  34 +               case Opt_force_over_16tb:
  35 +                       force_over_16tb = 1;
  36 +                       break;
  37                 default:
  38                         printk(KERN_ERR
  39                                "EXT4-fs: Unrecognized mount option \"%s\" "
  40 @@ -2692,6 +2699,16 @@ static int ext4_fill_super(struct super_
  41                 goto failed_mount;
  42         }
  43
  44 +       if (ext4_blocks_count(es) >= (1ULL << 32)) {
  45 +               if (force_over_16tb == 0) {
  46 +                       printk(KERN_ERR "EXT4-fs does not support filesystems "
  47 +                              "greater than 16TB and can cause data corruption."
  48 +                              "Use \"force_over_16tb\" 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