[Bug 1734395] [NEW] mkfs.ext4dev unrecognised file system

[Paul Graydon]

Public bug reported:

This is probably a bit of a daft one, and it's not blocking me on
anything, but I see this more as a UX bug.

mkfs.ext4dev creates a file system that mount then can't mount, unless
it is told explicitly that it is ext4.

(on a side note, what is ext4dev?  Can't seem to find a solid answer)


$ sudo mkfs.ext4dev /dev/sdb
mke2fs 1.42.13 (17-May-2015)
/dev/sdb contains a ext4 file system
        last mounted on Fri Nov 24 22:40:41 2017
Proceed anyway? (y,n) y
Creating filesystem with 268435456 4k blocks and 67108864 inodes
Filesystem UUID: d5dcc961-f34e-4f59-b0f5-f58ea75dc817
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

$ sudo mount /dev/sdb mount
mount: unknown filesystem type 'ext4dev'

$ sudo mount -t ext4 mount
$
/dev/sdb on /home/ubuntu/mount type ext4 (rw,relatime,data=ordered)


doing a normal mkfs.ext4 works perfectly fine, as you'd expect.

Version: Ubuntu 16.04
Package: e2fsprogs 1.42.13-1ubuntu1

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1734395

Title:
  mkfs.ext4dev unrecognised file system

Status in e2fsprogs package in Ubuntu:
  New

Bug description:
  This is probably a bit of a daft one, and it's not blocking me on
  anything, but I see this more as a UX bug.

  mkfs.ext4dev creates a file system that mount then can't mount, unless
  it is told explicitly that it is ext4.

  (on a side note, what is ext4dev?  Can't seem to find a solid answer)

  
  $ sudo mkfs.ext4dev /dev/sdb
  mke2fs 1.42.13 (17-May-2015)
  /dev/sdb contains a ext4 file system
          last mounted on Fri Nov 24 22:40:41 2017
  Proceed anyway? (y,n) y
  Creating filesystem with 268435456 4k blocks and 67108864 inodes
  Filesystem UUID: d5dcc961-f34e-4f59-b0f5-f58ea75dc817
  Superblock backups stored on blocks:
          32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
          4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
          102400000, 214990848

  Allocating group tables: done
  Writing inode tables: done
  Creating journal (32768 blocks): done
  Writing superblocks and filesystem accounting information: done

  $ sudo mount /dev/sdb mount
  mount: unknown filesystem type 'ext4dev'

  $ sudo mount -t ext4 mount
  $
  /dev/sdb on /home/ubuntu/mount type ext4 (rw,relatime,data=ordered)

  
  doing a normal mkfs.ext4 works perfectly fine, as you'd expect.

  Version: Ubuntu 16.04
  Package: e2fsprogs 1.42.13-1ubuntu1

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