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    SubjectRe: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]
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    On Thu, 2010-07-22 at 20:04 +0200, Volker Lendecke wrote:
    > On Thu, Jul 22, 2010 at 11:02:04AM -0700, Jeremy Allison wrote:
    > > On Thu, Jul 22, 2010 at 12:58:50PM -0400, Trond Myklebust wrote:
    > > >
    > > > That would make it impossible to export the filesystem with NFSv2 and
    > > > v3. They do rely on ctime checking for certain operations (e.g. deciding
    > > > when to invalidate access and acl caches). NFSv4 needs this too if the
    > > > filesystem has no dedicated change attribute.
    > > >
    > > > Still, I suppose the market for exporting the same filesystem with both
    > > > NFS and Samba is limited...
    > >
    > > Ask NetApp about that :-). They have built a rather large
    > > business on just that fact :-).
    >
    > Jeremy, how many hours have you spent getting "posix
    > locking" to the point where it is now? :-)
    >
    > Volker
    >
    > P.S: For those not aware, "posix locking = yes" is
    > cross-protocol byte range locking done by smbd to co-operate
    > with local processes and NFS.

    I said "limited", not "non-existent".

    The fact remains that most of us would be hard pressed to name an
    application that requires you to share the same dataset to both
    Windows/CIFS and posix NFS clients. Everything from ACL models through
    caseless vs case-aware filesystems and Windows vs posix locking
    semantics tends to discourage mixing the two environments.

    Trond



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