linux-kernel - Re: [PATCH 4.4 4.9 4.14] loop: Add LOOP_SET_DIRECT

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Message-ID: <20191025001750.GE31224@sasha-vm>
Date:   Thu, 24 Oct 2019 20:17:50 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Alessio Balsini <balsini@...roid.com>
Cc:     gregkh@...uxfoundation.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 4.4 4.9 4.14] loop: Add LOOP_SET_DIRECT_IO to compat ioctl

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@...nel.dk>
>Signed-off-by: Alessio Balsini <balsini@...roid.com>
>Signed-off-by: Jens Axboe <axboe@...nel.dk>
>Signed-off-by: Sasha Levin <sashal@...nel.org>

Queued up, thanks!

-- 
Thanks,
Sasha