linux-kernel - [PATCH 08/21] block: Error an attempt to split an atomic write bio

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Message-Id: <20230929102726.2985188-9-john.g.garry@oracle.com>
Date:   Fri, 29 Sep 2023 10:27:13 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     axboe@...nel.dk, kbusch@...nel.org, hch@....de, sagi@...mberg.me,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, djwong@...nel.org,
        viro@...iv.linux.org.uk, brauner@...nel.org,
        chandan.babu@...cle.com, dchinner@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, tytso@....edu, jbongio@...gle.com,
        linux-api@...r.kernel.org, John Garry <john.g.garry@...cle.com>
Subject: [PATCH 08/21] block: Error an attempt to split an atomic write bio

As the name suggests, we should not be splitting these.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 block/blk-merge.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 8d4de9253fe9..bc21f8ff4842 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -319,6 +319,11 @@ struct bio *bio_split_rw(struct bio *bio, const struct queue_limits *lim,
 	*segs = nsegs;
 	return NULL;
 split:
+	if (bio->bi_opf & REQ_ATOMIC) {
+		bio->bi_status = BLK_STS_IOERR;
+		bio_endio(bio);
+		return ERR_PTR(-EIO);
+	}
 	/*
 	 * We can't sanely support splitting for a REQ_NOWAIT bio. End it
 	 * with EAGAIN if splitting is required and return an error pointer.
-- 
2.31.1