On Tue, Apr 29, 2025 at 06:50:17PM +0200, Kevin Wolf wrote: > This adds a 'bool *forward' parameter to .prepare_ioctl, which allows > device mapper targets to accept ioctls to themselves instead of the > underlying device. If the target already fully handled the ioctl, it > sets *forward to false and device mapper won't forward it to the > underlying device any more. > > In order for targets to actually know what the ioctl is about and how to > handle it, pass also cmd and arg. > > As long as targets restrict themselves to interpreting ioctls of type > DM_IOCTL, this is a backwards compatible change because previously, any > such ioctl would have been passed down through all device mapper layers > until it reached a device that can't understand the ioctl and would > return an error. > > Signed-off-by: Kevin Wolf <kwolf@xxxxxxxxxx> Reviewed-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
