d2ef05bb44
Some ioctls (for example FS_IOC_FIEMAP) use structures whose size is not constant. The generic argument conversion code in do_ioctl() cannot handle this, so add support for implementing a special-case handler for a particular ioctl which does the conversion itself. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@iki.fi>