Re: [PATCH 4.4 4.9 4.14] loop: Add LOOP_SET_DIRECT_IO to compat ioctl

[Sasha Levin]

On Wed, Oct 23, 2019 at 06:17:36PM +0100, Alessio Balsini wrote:
> [ Upstream commit fdbe4eeeb1aac219b14f10c0ed31ae5d1123e9b8 ]
>
> Enabling Direct I/O with loop devices helps reducing memory usage by
> avoiding double caching.  32 bit applications running on 64 bits systems
> are currently not able to request direct I/O because is missing from the
> lo_compat_ioctl.
>
> This patch fixes the compatibility issue mentioned above by exporting
> LOOP_SET_DIRECT_IO as additional lo_compat_ioctl() entry.
> The input argument for this ioctl is a single long converted to a 1-bit
> boolean, so compatibility is preserved.
>
> Cc: Jens Axboe <axboe@xxxxxxxxx>
> Signed-off-by: Alessio Balsini <balsini@xxxxxxxxxxx>
> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

Queued up, thanks!

--
Thanks,
Sasha