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Re: [PATCHES] fix for Ubuntu support, live-initramfs





Daniel Baumann wrote:
Steven Shiau wrote:
From http://aufs.sourceforge.net/

Note: it becomes clear that "Aufs was rejected. Let's give it up."
According to Christoph Hellwig, linux rejects all union-type filesystems
but UnionMount.

i might be wrong, but isn't that why there's aufs2?
Yes, that's why aufs2. However, AFAIK, what J. R. Okajima has sent to mainline kernel is aufs2, not aufs1. I might be wrong.
There are more info here:
http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg01959.html
"I have posted aufs patches to LKML a few months before. And it becomes
  clear that "Aufs was rejected. Let's give it up."
  According to Christoph Hellwig, linux rejects all union-type
  filesystems but UnionMount.
  <http://marc.info/?l=linux-kernel&m=123938533724484&w=2>"



Therefore in the future, maybe it's better that live-initramfs can
support unionfs-fuse, and unionmount.

even tough having unionfs-fuse optionally arround would be nice, i'd
always prefere kernel based union (as long as it's
possible/maintainable). it's way faster, and pulling in fuse into the
initrd is quite much (for systems with low ram).

Definitely! kernel based is much better. union-fuse is just an option when there is no union-type file system available in some cases, e.g. the Ubuntu 9.10 alpha2... it does not include unionfs, aufs, aufs2... because of the reason mentioned previously IIRC. Actually the Ubuntu 9.10 alpha 2 live CD is using unionfs-fuse.

Steven.

--
Steven Shiau <steven _at_ nchc org tw> <steven _at_ stevenshiau org>
National Center for High-performance Computing, Taiwan.
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