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    SubjectRe: [PATCH RESEND] Handle i_size > s_maxbytes correctly
    On Wed, Jan 23, 2008 at 06:54:41PM +0100, Jan Kara wrote:
    > A different solution (even with smaller impact) would be to not allow
    > files with i_size > s_maxbytes in VFS at all. For local filesystems we can
    > just check this on open and everything is fine

    Which we should do.

    > but with remote filesystems
    > such as OCFS2 (or NFS) filesize can be changed on the fly from a different
    > machine. So to avoid problems we can either introduce some locking to
    > prevent changes of i_size from other machines while we are in critical
    > sections (awww, I really don't think this is better) or truncate i_size to
    > s_maxbytes when we update i_size from what we've received via network /
    > shared storage (but then we'd have to track whether user truncated file to
    > some size or whether fs truncated it just for safety and apps could be
    > confused too). So I don't think this is really feasible.

    The right fix for cluster filesystem is to have a coherent maximum file
    size for the whole cluster. If that can't be done due to protocol
    reason we need to lock around i_size update and revoke access to the
    inode on the client that doesn't support it. Which of course would
    require a working revoke to start with..



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