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Subject: [PATCH] netfs: Fix READ/WRITE confusion when calling
 iov_iter_xarray()
From:   David Howells <dhowells@redhat.com>
To:     linux-cachefs@redhat.com
Cc:     Jeff Layton <jlayton@kernel.org>, linux-afs@lists.infradead.org,
        ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org,
        linux-nfs@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
        linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        dhowells@redhat.com, linux-kernel@vger.kernel.org
Date:   Mon, 26 Jul 2021 10:58:33 +0100
Message-ID: <162729351325.813557.9242842205308443901.stgit@warthog.procyon.org.uk>
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Fix netfs_clear_unread() to pass READ to iov_iter_xarray() instead of WRITE
(the flag is about the operation accessing the buffer, not what sort of
access it is doing to the buffer).

Fixes: 3d3c95046742 ("netfs: Provide readahead and readpage netfs helpers")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-afs@lists.infradead.org
cc: ceph-devel@vger.kernel.org
cc: linux-cifs@vger.kernel.org
cc: linux-nfs@vger.kernel.org
cc: v9fs-developer@lists.sourceforge.net
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
---

 fs/netfs/read_helper.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index 0b6cd3b8734c..994ec22d4040 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -150,7 +150,7 @@ static void netfs_clear_unread(struct netfs_read_subrequest *subreq)
 {
 	struct iov_iter iter;
 
-	iov_iter_xarray(&iter, WRITE, &subreq->rreq->mapping->i_pages,
+	iov_iter_xarray(&iter, READ, &subreq->rreq->mapping->i_pages,
 			subreq->start + subreq->transferred,
 			subreq->len   - subreq->transferred);
 	iov_iter_zero(iov_iter_count(&iter), &iter);