In message <20081128161921.GA3843@xxxxxxxxxx>, Bharata B Rao writes: > On Fri, Nov 28, 2008 at 12:01:32PM +0100, Miklos Szeredi wrote: > > I've been doing some small fixing/cleanup work on the union directory > > patches by Jan, and just noticed there's a thread about the union > > mounts on LKML, so I thought publicizing won't hurt. > > Interesting that you call it "union directory", do you have plans to go > the Plan 9's way of union directories ? > > > > > It's still a work in progress, notably the readdir code currently only > > works on a few specific filesystem types. > > readdir was one of the things on which we couldn't reach a consensus > on how to do it the right way. We were suggested that we move the > duplicate elimination into user space and an effort towards this was > also done (Ref: http://lkml.org/lkml/2008/4/29/248) by moving this > to glibc readdir. But we weren't sure how this could work for NFS and > were told that it is required to get the NFS side of things > sorted out first. So that's where readdir effort stands now afaik. > Do you have any ideas/plans on this front ? > > Also the last development activity that I am aware of was done towards > getting a generic whiteout support. David Woodhouse started a git tree > at one point of time for whiteout support > (git://git.infradead.org/union/whiteout-2.6.git). Erez Zodak was > infact looking forward for these changes to make use of them in Unionfs, > but even this effort died down. We've actually been (quietly) looking into these whiteout patches for a couple of months already. We found that those patches were not yet suitable for intergration into a f/s such as unionfs. We found (and fixed) some bugs, and had to change the API somewhat and its implementation. I think the only way to be sure that these patches work well is to have a user for them. We plan on re-posting our modified patches once we've done a lot more testing with them in the context of unionfs. > Nice to know that you have started looking into Union Mount patches. > Would be interesting to know/understand your plans/thoughts on taking > this effort forward. > > Regards, > Bharata. > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Erez. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
