CIFS: Do not permit write to a range mandatory locked with a read lock
We don't need to permit a write to the area locked with a read lock by any process including the process that issues the write. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
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