Re: Versioning File Systems?

Mark Mielke (mark@mark.mielke.cc)
Fri, 19 Apr 2002 00:12:08 -0400

On Thu, Apr 18, 2002 at 07:19:47PM -0400, Stevie O wrote:
> At 08:20 AM 4/18/2002 -0700, Larry McVoy wrote:
> >It's certainly a fun space, file system hacking is always fun. There
> >doesn't seem to be a good match between file system operations and
> >SCM operations, especially stuff like checkin. write != checkin.
> >But you can handle that with
> How about
> fsync(fd) || close(fd) == checkin?

Source management systems usually work much better given explicit
control for the user.

ClearCase has MVFS to do what is being suggested. Compare:

cat a.c # currently selected version of a.c
cat a.c@@/main/5 # version 5 on the main branch

cat a.c@@LINUX_2.4.18 # the version of a.c selected by the
# label 'LINUX_2.4.18'

Having a file system that implicitly performs these operations is
not very useful.

mark

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