hw/9pfs: use O_NOFOLLOW for mapped readlink operation
With mapped security models like mapped-xattr and mapped-file, we save the symlink target as file contents. Now if we ever expose a normal directory with mapped security model and find real symlinks in export path, never follow them and return proper error. Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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