[Bug 1807288] Re: mkfs.ext4 -d $directory_with_acls leads to EINVAL

[Steve Langasek]

** Also affects: e2fsprogs (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Also affects: e2fsprogs (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: e2fsprogs (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1807288

Title:
  mkfs.ext4 -d $directory_with_acls leads to EINVAL

Status in e2fsprogs package in Ubuntu:
  New
Status in e2fsprogs source package in Bionic:
  New
Status in e2fsprogs source package in Cosmic:
  New
Status in e2fsprogs source package in Disco:
  New

Bug description:
  [Justification]
  `mkfs.ext4 -d` can produce broken filesystems when there are acls in the tree used as input.

  [Test case]
  1. dd if=/dev/zero count=0 bs=1M seek=100 of=./fake.img
  2. mkdir -p stuff/journal
  3. setfacl -m g:adm:rwx stuff/journal
  4. mkfs.ext4 -L lala -O -metadata_csum -T default -O uninit_bg fake.img -d ./stuff/
  5. sudo mount ./fake.img /mnt
  6. Verify that `getfacl /mnt/journal/` returns an error.
  7. sudo umount /mnt
  8. install libext2fs2 from -proposed.
  9. mkfs.ext4 -L lala -O -metadata_csum -T default -O uninit_bg fake.img -d ./stuff/
  10. sudo mount ./fake.img /mnt
  11. Verify that `getfacl /mnt/journal/` returns acl information, not an error.
  12. sudo umount /mnt

  [Original description]

  This looks an awful lot like bug 1645232 but that is claimed to be
  fixed:

  mwhudson at ringil:~/tmp$ mkfs.ext4 -V
  mke2fs 1.44.1 (24-Mar-2018)
   Using EXT2FS Library version 1.44.1
  mwhudson at ringil:~/tmp$ dd if=/dev/zero count=0 bs=1M seek=100 of=./fake.img
  0+0 records in
  0+0 records out
  0 bytes copied, 0.0015871 s, 0.0 kB/s
  mwhudson at ringil:~/tmp$ mkdir -p stuff/journal
  mwhudson at ringil:~/tmp$ setfacl -m g:adm:rwx stuff/journal
  mwhudson at ringil:~/tmp$ mkfs.ext4 -L lala -O -metadata_csum -T default -O uninit_bg fake.img -d ./stuff/
  mke2fs 1.44.1 (24-Mar-2018)
  Discarding device blocks: done
  Creating filesystem with 25600 4k blocks and 6400 inodes

  Allocating group tables: done
  Writing inode tables: done
  Creating journal (1024 blocks): done
  Copying files into the device: done
  Writing superblocks and filesystem accounting information: done

  mwhudson at ringil:~/tmp$ sudo mount ./fake.img /mnt
  mwhudson at ringil:~/tmp$ getfacl /mnt/journal/
  getfacl: /mnt/journal/: Invalid argument

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