jfs: 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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@ -1600,7 +1600,7 @@ out:
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static int jfs_ci_revalidate(struct dentry *dentry, struct nameidata *nd)
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{
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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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/*
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* This is not negative dentry. Always valid.
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