linux-kernel - [PATCH v10 2/3] ublk: move check for empty address field on command submission

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Date:   Thu,  3 Aug 2023 16:07:00 +0200
From:   "Andreas Hindborg (Samsung)" <nmi@...aspace.dk>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>, gost.dev@...sung.com,
        linux-block@...r.kernel.org (open list:BLOCK LAYER),
        Hans Holmberg <Hans.Holmberg@....com>,
        Matias Bjorling <Matias.Bjorling@....com>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Thumshirn <jth@...nel.org>,
        Aravind Ramesh <Aravind.Ramesh@....com>,
        Damien Le Moal <dlemoal@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v10 2/3] ublk: move check for empty address field on command submission

From: Andreas Hindborg <a.hindborg@...sung.com>

In preparation for zoned storage support, move the check for empty `addr`
field into the command handler case statement. Note that the check makes no
sense for `UBLK_IO_NEED_GET_DATA` because the `addr` field must always be
set for this command.

Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
---
 drivers/block/ublk_drv.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index db3523e281a6..5a1ee17636ac 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -1419,11 +1419,6 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 			^ (_IOC_NR(cmd_op) == UBLK_IO_NEED_GET_DATA))
 		goto out;
 
-	if (ublk_support_user_copy(ubq) && ub_cmd->addr) {
-		ret = -EINVAL;
-		goto out;
-	}
-
 	ret = ublk_check_cmd_op(cmd_op);
 	if (ret)
 		goto out;
@@ -1452,6 +1447,12 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 				goto out;
 		}
 
+		/* User copy requires addr to be unset */
+		if (ublk_support_user_copy(ubq) && ub_cmd->addr) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		ublk_fill_io_cmd(io, cmd, ub_cmd->addr);
 		ublk_mark_io_ready(ub, ubq);
 		break;
@@ -1470,6 +1471,13 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 						req_op(req) == REQ_OP_READ))
 				goto out;
 		}
+
+		/* User copy requires addr to be unset */
+		if (ublk_support_user_copy(ubq) && ub_cmd->addr) {
+			ret = -EINVAL;
+			goto out;
+		}
+
 		ublk_fill_io_cmd(io, cmd, ub_cmd->addr);
 		ublk_commit_completion(ub, ub_cmd);
 		break;
-- 
2.41.0