Re: PATCH/RFC Add support for using UUID to identify filesystem in filehandle

[Neil Brown <neilb@suse.de>]

On Friday February 2, trond.myklebust@fys.uio.no wrote:
> 
> I like the idea of using a UUID. That makes server setup infinitely more
> easy, and should definitely be the default.
> 
> What are the filesystems that support 16 byte UUIDs these days? Should
> we also support hashed labels for those that do not?

libblkid seems to find 16byte uuids for
   ext2, ext3, xfs, reiserfs, reiser4, jfs, ocfs, ocfs2

So that excludes FAT (which has a 4 byte uuid), minix, ISO9660, UDF
and some very minor filesystems.

ISO9660 seems to be the only significant one that has a label but not
a uuid.

> 
> About the code. It would really be nice if you could avoid all these
> open-coded filehandle version numbers and fsid types. Use of a macro or
> enum to name them would certainly help the casual code reviewer. Also,
> names like "mk_fsid_v7" do tend to confuse. Perhaps something like
> mk_fsid_uuid() and mk_fsid_uuid_root_export() (for v6)?

Fair comment.  I'll have a look and a think and see what makes it most
readable.

Thanks,
NeilBrown

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