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    Subject[PATCH 4.4 4.9 4.14] loop: Add LOOP_SET_DIRECT_IO to compat ioctl
    Date
    [ 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>
    ---
    drivers/block/loop.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/block/loop.c b/drivers/block/loop.c
    index da3902ac16c86..8aadd4d0c3a88 100644
    --- a/drivers/block/loop.c
    +++ b/drivers/block/loop.c
    @@ -1557,6 +1557,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode,
    arg = (unsigned long) compat_ptr(arg);
    case LOOP_SET_FD:
    case LOOP_CHANGE_FD:
    + case LOOP_SET_DIRECT_IO:
    err = lo_ioctl(bdev, mode, cmd, arg);
    break;
    default:
    --
    2.23.0.866.gb869b98d4c-goog
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