From: Joel Fernandes <joel@joelfernandes.org>
To: Alessio Balsini <balsini@android.com>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
axboe@kernel.dk, dvander@gmail.com, elsk@google.com,
gregkh@linuxfoundation.org, kernel-team@android.com
Subject: Re: [PATCH v2] loop: Add LOOP_SET_DIRECT_IO to compat ioctl
Date: Thu, 8 Aug 2019 19:51:50 -0400 [thread overview]
Message-ID: <20190808235150.GA208797@google.com> (raw)
In-Reply-To: <20190807004828.28059-1-balsini@android.com>
On Wed, Aug 07, 2019 at 01:48:28AM +0100, Alessio Balsini wrote:
> 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.
This commit message looks better now.
thanks,
- Joel
> Cc: Jens Axboe <axboe@kernel.dk>
> Signed-off-by: Alessio Balsini <balsini@android.com>
> ---
> drivers/block/loop.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/block/loop.c b/drivers/block/loop.c
> index 44c9985f352ab..2e2193f754ab0 100644
> --- a/drivers/block/loop.c
> +++ b/drivers/block/loop.c
> @@ -1753,6 +1753,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode,
> case LOOP_SET_FD:
> case LOOP_CHANGE_FD:
> case LOOP_SET_BLOCK_SIZE:
> + case LOOP_SET_DIRECT_IO:
> err = lo_ioctl(bdev, mode, cmd, arg);
> break;
> default:
> --
> 2.23.0.rc1.153.gdeed80330f-goog
>
next prev parent reply other threads:[~2019-08-08 23:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 22:05 [PATCH] loop: Add LOOP_SET_DIRECT_IO in compat ioctl Alessio Balsini
2019-08-06 22:25 ` Joel Fernandes
2019-08-06 23:57 ` Alessio Balsini
2019-08-07 0:10 ` Joel Fernandes
2019-08-07 0:48 ` [PATCH v2] loop: Add LOOP_SET_DIRECT_IO to " Alessio Balsini
2019-08-08 23:51 ` Joel Fernandes [this message]
2019-08-09 3:39 ` Jens Axboe
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