title: Mounting ext4 mounts as ext2 in linux 4.4.0 [RHEL]
body: <blockquote>
    <p>commands I executed</p>
  </blockquote>
  
  <h1>mkfs .ext4 -F /dev/xxx0</h1>
  
  <pre><code>mke2fs 1.42.9 (28-Dec-2013)
  Filesystem label=
  OS type: Linux
  Block size=4096 (log=2)
  Fragment size=4096 (log=2)
  Stride=0 blocks, Stripe width=0 blocks
  524288 inodes, 2097152 blocks
  104857 blocks (5.00%) reserved for the super user
  First data block=0
  Maximum filesystem blocks=2147483648
  64 block groups
  32768 blocks per group, 32768 fragments per group
  8192 inodes per group
  Superblock backups stored on blocks:
          32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
  
  Allocating group tables: done
  Writing inode tables: done
  Writing superblocks and filesystem accounting information: done
  </code></pre>
  
  <h1>mount -o dax /dev/xxx0 /mnt/ext4-xxx0</h1>
  
  <blockquote>
    <p>mount output</p>
  </blockquote>
  
  <pre><code>/dev/xxx0 on /mnt/ext4-xxx0 type ext2 (rw,relatime,seclabel,block_validity,barrier,dax,user_xattr,acl)
  </code></pre>
  
  <blockquote>
    <p>dmesg output</p>
  </blockquote>
  
  <pre><code>[ 2917.044866] EXT4-fs (xxx0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
  [ 2917.044869] EXT4-fs (xxx0): mounting ext2 file system using the ext4 subsystem
  ...
  ...
  [ 2917.045459] EXT4-fs (xxx0): mounted filesystem without journal. Opts: dax
  </code></pre>
  
  <p>which subsequently results in failure of fallocate, as the ext2 is not supported fos ext2.</p>
  
  <p>any suggestions/solution would be appreciated.</p>