Re: [issue1863] Implement 'hammer volume-list' subcommand
ioctls copy data into/out of kernel space for you, but the
size of the structure is built into the ioctl command so it
cannot change without changing the ioctl command. It's also
fairly limited. So anything that is potentially large needs
to be passed in as a separate user pointer embedded in
the ioctl command structure.
-Matt
Matthew Dillon
<dillon@backplane.com>
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