Linux-Block Archive on lore.kernel.org
 help / color / Atom feed
From: Evan Green <evgreen@chromium.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Gwendal Grignou <gwendal@chromium.org>,
	Alexis Savery <asavery@chromium.org>,
	Evan Green <evgreen@chromium.org>,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] loop: Report EOPNOTSUPP properly
Date: Tue, 30 Oct 2018 16:06:23 -0700
Message-ID: <20181030230624.61834-2-evgreen@chromium.org> (raw)
In-Reply-To: <20181030230624.61834-1-evgreen@chromium.org>

Properly plumb out EOPNOTSUPP from loop driver operations, which may
get returned when for instance a discard operation is attempted but not
supported by the underlying block device. Before this change, everything
was reported in the log as an I/O error, which is scary and not
helpful in debugging.

Signed-off-by: Evan Green <evgreen@chromium.org>
---

 drivers/block/loop.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index abad6d15f9563..28990fc94841a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -458,8 +458,13 @@ static void lo_complete_rq(struct request *rq)
 
 	if (!cmd->use_aio || cmd->ret < 0 || cmd->ret == blk_rq_bytes(rq) ||
 	    req_op(rq) != REQ_OP_READ) {
-		if (cmd->ret < 0)
-			ret = BLK_STS_IOERR;
+		if (cmd->ret < 0) {
+			if (cmd->ret == -EOPNOTSUPP)
+				ret = BLK_STS_NOTSUPP;
+			else
+				ret = BLK_STS_IOERR;
+		}
+
 		goto end_io;
 	}
 
@@ -1788,7 +1793,10 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
  failed:
 	/* complete non-aio request */
 	if (!cmd->use_aio || ret) {
-		cmd->ret = ret ? -EIO : 0;
+		if (ret == -EOPNOTSUPP)
+			cmd->ret = ret;
+		else
+			cmd->ret = ret ? -EIO : 0;
 		blk_mq_complete_request(rq);
 	}
 }
-- 
2.16.4

  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-30 23:06 [PATCH 0/2] loop: Better discard for block devices Evan Green
2018-10-30 23:06 ` Evan Green [this message]
2018-11-28  1:06   ` [PATCH 1/2] loop: Report EOPNOTSUPP properly Ming Lei
2018-10-30 23:06 ` [PATCH 2/2] loop: Better discard support for block devices Evan Green
2018-11-26 18:53   ` Evan Green
2018-11-27  2:55     ` Ming Lei
2018-11-27 23:34       ` Evan Green
2018-11-28  1:28         ` Ming Lei
2018-11-28  1:26   ` Ming Lei
2018-12-04 22:19     ` Evan Green
2018-12-05  1:10       ` Ming Lei
2018-12-05 19:35         ` Evan Green
2018-12-06  0:22           ` Ming Lei
2018-12-06  3:15           ` Martin K. Petersen
2018-12-10 17:31             ` Evan Green
2018-12-18 23:48               ` Evan Green
2018-10-30 23:50 ` [PATCH 0/2] loop: Better discard " Bart Van Assche
2018-11-01 18:15   ` Evan Green
2018-11-01 22:41     ` Gwendal Grignou
2018-11-01 22:44     ` Gwendal Grignou
2018-11-02 16:02       ` Bart Van Assche
2018-11-05 20:35         ` Evan Green
2020-03-17 15:11 [PATCH 0/2] loop: Better discard support " Andrzej Pietrasiewicz
2020-03-17 15:11 ` [PATCH 1/2] loop: Report EOPNOTSUPP properly Andrzej Pietrasiewicz

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20181030230624.61834-2-evgreen@chromium.org \
    --to=evgreen@chromium.org \
    --cc=asavery@chromium.org \
    --cc=axboe@kernel.dk \
    --cc=gwendal@chromium.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Block Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-block/0 linux-block/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-block linux-block/ https://lore.kernel.org/linux-block \
		linux-block@vger.kernel.org
	public-inbox-index linux-block

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-block


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git