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    Subjectvfs-scale, d_revalidate from nfsd

    NFSD calls filesystem's ->d_revalidate() with the parameter nd == NULL.
    So every
    if (nd->flags & LOOKUP_RCU)
    return -ECHILD;
    code which was added to ->d_revalidate() of FS which supports NFS
    exporting will crash.

    If we rewrite it as
    if (nd && (nd->flags & LOOKUP_RCU))
    return -ECHILD;
    the problem may not occur.
    But I am not sure whether lookup_one_len() call in NFSD support rcu-walk.

    J. R. Okajima

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      Last update: 2011-01-13 15:07    [W:0.017 / U:7.224 seconds]
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