getfsent and LABEL= or UUID=

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

I just got a request whether getfsent and family could return in fs_spec the
actual device in case LABEL= or UUID= is used. It might make some sense
since otherwise all various programs using getfsent would have to do it
themselves, on the other side there might be some applications interested in
the LABEL= or UUID= (e.g. to copy it somewhere else).
One option could be to enlarge struct fstab (together with symbol
versioning) and either put the actual device into a new const char * field,
or put the actual device into fs_spec and put the original LABEL= or UUID=
into the new field.
At least checking ext2 labels or uuids does not require bringing too much
ext2 knowledge in, it basically means reading /proc/partitions, for each
partition there try to read ext2 superblock, check ext2 magic and if it is
ok, copy in two superblock fields into some cache.
Comments?

	Jakub