On 11/02/2009 10:41 AM, Doug Ledford wrote: > On 10/29/2009 11:17 AM, Steve Dickson wrote: >> >> >> On 10/28/2009 03:05 PM, Roland McGrath wrote: >>> It sounds like you are saying that there is no way to export the same >>> host filesystems with the same client-perceived names under v4 as was >>> being done before under v[23]. Is that really true? >> With Pre-F12 servers... Yeah... >> >> The V4 protocol requires a 'pseudo root' to be defined. Other servers simply >> make '/' the pseudo root which allows all exports just to work with all versions. >> The Linux server have the feature of being able to define the pseudo root with >> the use of the 'fsid=0' export option. A feature none of the other servers >> have. > > Except that when the other servers create a pseudo root, they don't > *also* expose that pseudo root. I'm fairly strongly of the opinion that > our NFS server should do the same thing: don't expose the pseudo root as > an actual mount. I believe the F-12 kernel does the right thing... just like the all the other servers do... > >> Unfortunately, there was no forethought as to what happens when a >> pseudo root is not defined, until recently... Patches in both the >> F-12 kernel and rpc.mountd now dynamically allocate a pseudo root >> when one is not defined... Basically meaning '/' becomes the pseudo >> root when there is no fsid=0 export option. > > And does this explicitly export the / filesystem? I would certainly > hope not as that could surprise the hell out of an admin when his / > filesystem is now exposed when it didn't use to be. Well the fsid=0 is documented in the man page but the answer to your question is yes... > >>> >>> My old /etc/exports is: >>> >>> /mirror *(ro,insecure,sync,mp,all_squash) >>> >>> So clients mount server:/mirror to see my /mirror directory's contents. >>> No other /foo directory is exported or visible at all to clients, and >>> that's how it should stay. >>> >>> How do I get the same results for v4 clients? >> Use a F-12 server or added the '/ *(ro,fsid=0)' export entry like: >> >> / *(ro,fsid=0) >> /mirror *(ro,insecure,sync,mp,all_squash) > > I'm perfectly fine with adding the entry to the exports file, but I > think the fsid=0 export entry should be a non-functioning entry other > than setting the pseudo root. As you've described it so far, it also > happens to be a live export and I think that's wrong and should be fixed. I'm not sure about this... Actually I like the fact we can define a pseudo root other than '/'... which means you really want a live exported directory with the fsid=0 option... If I am understanding what you are saying... steved. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
