Upcoming filesystems?

[David Schultz]

On Thu, Feb 12, 2004, Tom Arnold wrote:
> Are there any Journaling FS projects ongoing for FreeBSD that arn't on the
> general radar?

I believe there is an effort underway to port SGI's XFS to FreeBSD.


On Fri, Feb 13, 2004, Xin LI wrote:
> There was a journalling fs in FreeBSD in the past, however, it was removed
> (after it was imported from 4.4BSD-Lite2's distribution) because there
> are few people who want it.

You're thinking of LFS, which isn't exactly the same as
journalling.  In LFS, the journal *is* the filesystem.  LFS does
share the advantage of requiring no fsck, though.  (It requires an
incremental cleaner, but that runs continuously in the
background.)

Modern-day ``LFS-like'' filesystems include HP AutoRAID, Network
Appliances' filesystem, and Sun's Zettabyte Filesystem.  The
latter two are not technically log-structured, but they perform
block allocation and provide consistency in similar ways.
NetBSD has an LFS implementation that is true to the original.