On Mon, May 24, 2010 at 01:06:31PM -0400, Trond Myklebust wrote: > I believe that the answer is that most filehandle types include an > encoding of the inode number of the export directory. In other words, as > long as '/a' and '/b' are different directories, then they will result > in the generation of different filehandles for /a/x and /b/x. > > It seems that is not always the case, though. According to the > definition of mk_fsid(), it looks as if the 'FSID_UUID8' and > 'FSID_UUID16' filehandle types only encode the uuid of the filesystem, > and have no inode information. They will therefore not be able to > distinguish between an export through '/a' or '/b'. > > Neil, Bruce am I right? Er? On server: mount -t ext2 /dev/sdb1 /srv/nfs4 mount -t ext2 /dev/sda1 /srv/nfs4/a mount -t ext2 /dev/sda1 /srv/nfs4/b after that /srv/nfs4/a and /srv/nfs4/b will have the *same* inode, nevermind the inode number. I really mean the same filesystem mounted twice; if you want to include inumber of mountpoint into fsid, fine, turn the above into mount -t ext2 /dev/sdb1 /srv/nfs4 mount -t ext2 /dev/sda1 /srv/nfs4/a mount -t ext2 /dev/sda1 /srv/nfs4/b mount -t ext2 /dev/sda3 /srv/nfs4/a/z mount -t ext2 /dev/sda3 /srv/nfs4/b/z At that point you have the same fs (ext2 from sda3) mounted on /srv/nfs4/a/z and /srv/nfs4/b/z, with the same directory inode overmounted by it in both mountpoints. Suppose your referral point is on /a/z/x and /b/z/x resp. and see the question upthread... -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
