linux-user: Support ioctls whose parameter size is not constant
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: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>
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