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The data_wait_err ioctl currently requires the correct data_version for the inode to be passed in, or else the ioctl returns -ESTALE. But the ioctl itself is just a passthrough mechanism for notifying data waiters, which doesn't involve the data_version at all. Instead, we can just drop checking the value. The field remains in the headers, but we've marked it as being ignored from now on. The reason for the change is documented in the header file as well. This all is a lot simpler than having to modify/rev the data_waiters interface to support passing back the data_version, because there isn't any space left to easily do this, and then userspace would just pass it back to the data_wait_err ioctl. Signed-off-by: Auke Kok <auke.kok@versity.com>