df: the inode format and various block-size arguments

[Bernhard Voelker]

Working on the new --output option for df, I realized that
'df -i' only honors the --block-size arguments 'si' and
'human-readable', but not arbitrary values like '1M':

  $ for o in human-readable si M 1M ; do \
      src/df -i --block-size=$o . ; \
    done
  Filesystem     Inodes IUsed IFree IUse% Mounted on
  /dev/sdb         256K   21K  236K    9% /home
  Filesystem     Inodes IUsed IFree IUse% Mounted on
  /dev/sdb         263k   22k  241k    9% /home
  Filesystem     Inodes IUsed  IFree IUse% Mounted on
  /dev/sdb       262144 21406 240738    9% /home
  Filesystem     Inodes IUsed  IFree IUse% Mounted on
  /dev/sdb       262144 21406 240738    9% /home

There's nothing helpful about this in the .texi file.
Is this correct behavior? If true, then it should at
least be documented.

But here's an even stranger example: df appends the
'B' suffix to the inode values while not taking the
factor into account:

src/df -i --block-size=MiB .
Filesystem      Inodes  IUsed   IFree IUse% Mounted on
/dev/sdb       262144B 21406B 240738B    9% /home

What about this?

Have a nice day,
Berny