ceph: fix d_revalidate oopsen on NFS exports
can't blindly check nd->flags in ->d_revalidate() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -993,7 +993,7 @@ static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
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{
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struct inode *dir;
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if (nd->flags & LOOKUP_RCU)
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if (nd && nd->flags & LOOKUP_RCU)
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return -ECHILD;
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dir = dentry->d_parent->d_inode;
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