diff mbox

[1/2] loop: don't try to use AIO for discards

Message ID 1470319801-20594-2-git-send-email-hch@lst.de (mailing list archive)
State New, archived
Headers show

Commit Message

Christoph Hellwig Aug. 4, 2016, 2:10 p.m. UTC 
Fix a fat-fingered conversion to the req_op accessors, and also
use a switch statement to make it more obvious what is being checked.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Dave Chinner <david@fromorbit.com>
Fixes: c2df40 ("drivers: use req op accessor");
---
 drivers/block/loop.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

Comments

Ming Lei Aug. 4, 2016, 2:24 p.m. UTC | #1 
On Thu, Aug 4, 2016 at 10:10 PM, Christoph Hellwig <hch@lst.de> wrote:
> Fix a fat-fingered conversion to the req_op accessors, and also
> use a switch statement to make it more obvious what is being checked.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reported-by: Dave Chinner <david@fromorbit.com>
> Fixes: c2df40 ("drivers: use req op accessor");
> ---
>  drivers/block/loop.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/block/loop.c b/drivers/block/loop.c
> index 075377e..91c2c88 100644
> --- a/drivers/block/loop.c
> +++ b/drivers/block/loop.c
> @@ -1659,11 +1659,15 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
>         if (lo->lo_state != Lo_bound)
>                 return -EIO;
>
> -       if (lo->use_dio && (req_op(cmd->rq) != REQ_OP_FLUSH ||
> -           req_op(cmd->rq) == REQ_OP_DISCARD))
> -               cmd->use_aio = true;
> -       else
> +       switch (req_op(cmd->rq)) {
> +       case REQ_OP_FLUSH:
> +       case REQ_OP_DISCARD:
>                 cmd->use_aio = false;
> +               break;
> +       default:
> +               cmd->use_aio = lo->use_dio;
> +               break;
> +       }

Reviewed-by: Ming Lei <ming.lei@canonical.com>

>
>         queue_kthread_work(&lo->worker, &cmd->work);
>
> --
> 2.1.4
>
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diff mbox

Patch

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 075377e..91c2c88 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1659,11 +1659,15 @@  static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (lo->lo_state != Lo_bound)
 		return -EIO;
 
-	if (lo->use_dio && (req_op(cmd->rq) != REQ_OP_FLUSH ||
-	    req_op(cmd->rq) == REQ_OP_DISCARD))
-		cmd->use_aio = true;
-	else
+	switch (req_op(cmd->rq)) {
+	case REQ_OP_FLUSH:
+	case REQ_OP_DISCARD:
 		cmd->use_aio = false;
+		break;
+	default:
+		cmd->use_aio = lo->use_dio;
+		break;
+	}
 
 	queue_kthread_work(&lo->worker, &cmd->work);