Messages in this thread | | | Date | Fri, 9 May 2008 16:05:54 -0400 | From | Erez Zadok <> | Subject | Re: [RFC PATCH 1/2] Union Mount: glibc readdir support |
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In message <20080506042117.GA29298@in.ibm.com>, Bharata B Rao writes: > On Wed, Apr 30, 2008 at 11:08:41PM -0700, Ulrich Drepper wrote: > > > > Before anything further is discussed I need to know how you expect to > > handle NFS? I don't see how, with a userlevel readdir implementation, > > you can support NFS. > > At the client side, I don't see a problem with unioning NFS with other > FS. Kernel would still return all dirents of the union including those > from NFS and glibc readdir would be able to handle them appropriately. > Or am I missing something ? > > At the server side, I can't see how NFS server could export a union. > I don't see how this could be sanely done with Union Mount. Erez, how > does Unionfs handle this ? [...]
The ODF version of unionfs stores, among other things, persistent inode numbers in a small/special /odf partition. If the inums aren't persistent, they could get flushed out of memory, making it very difficult to reconstruct the inode w/ the same inum later on.
Erez.
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