linux-kernel - [PATCH 3/5] netfs: Fix missing iterator reset on retry of short read

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Message-ID: <20240823161209.434705-4-dhowells@redhat.com>
Date: Fri, 23 Aug 2024 17:12:04 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>
Cc: David Howells <dhowells@...hat.com>,
	Pankaj Raghav <p.raghav@...sung.com>,
	Jeff Layton <jlayton@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	netfs@...ts.linux.dev,
	linux-afs@...ts.infradead.org,
	linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	ceph-devel@...r.kernel.org,
	v9fs@...ts.linux.dev,
	linux-erofs@...ts.ozlabs.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Steve French <sfrench@...ba.org>,
	Paulo Alcantara <pc@...guebit.com>
Subject: [PATCH 3/5] netfs: Fix missing iterator reset on retry of short read

Fix netfs_rreq_perform_resubmissions() to reset before retrying a short
read, otherwise the wrong part of the output buffer will be used.

Fixes: 92b6cc5d1e7c ("netfs: Add iov_iters to (sub)requests to describe various buffers")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Paulo Alcantara <pc@...guebit.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: linux-cifs@...r.kernel.org
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
---
 fs/netfs/io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/netfs/io.c b/fs/netfs/io.c
index 605b667fe3a6..d6ada4eba744 100644
--- a/fs/netfs/io.c
+++ b/fs/netfs/io.c
@@ -315,6 +315,7 @@ static bool netfs_rreq_perform_resubmissions(struct netfs_io_request *rreq)
 			netfs_read_from_server(rreq, subreq);
 		} else if (test_bit(NETFS_SREQ_SHORT_IO, &subreq->flags)) {
 			__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
+			netfs_reset_subreq_iter(rreq, subreq);
 			netfs_rreq_short_read(rreq, subreq);
 		}
 	}