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@kernel.dk Signed-off-by: Alessio Balsini balsini@android.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org
Queued up, thanks!