Re: ioctl FIBMAP for dax gone in v4.17-rc1

Theodore Y. Ts'o
2018-04-17T23:35:13Z

On Tue, Apr 17, 2018 at 10:50:07AM -0700, Darrick J. Wong wrote:
> syslinux does FIEMAP w/ FIBMAP fallback.
>
> lilo & elilo still use FIBMAP only, but lilo hasn't seen a release since
> 2015 and elilo 2013. I prefer not to add FIBMAP support in XFS-DAX for
> the singular case of booting off pmem via lilo.

It shouldn't be that hard to write a userspace emulation layer which
exports a FIBMAP-like functional interface but gets the information
from the kernel using the FIMAP ioctl....

- Ted