linux-kernel - [PATCH] netfs: Fix READ/WRITE confusion when calling iov_iter

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Date:   Thu, 23 Sep 2021 10:52:26 +0100
From:   David Howells <dhowells@...hat.com>
To:     torvalds@...ux-foundation.org
Cc:     Jeff Layton <jlayton@...nel.org>, linux-cachefs@...hat.com,
        linux-afs@...ts.infradead.org, ceph-devel@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH] netfs: Fix READ/WRITE confusion when calling
 iov_iter_xarray()

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@...hat.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
cc: linux-cachefs@...hat.com
cc: linux-afs@...ts.infradead.org
cc: ceph-devel@...r.kernel.org
cc: linux-cifs@...r.kernel.org
cc: linux-nfs@...r.kernel.org
cc: v9fs-developer@...ts.sourceforge.net
cc: linux-fsdevel@...r.kernel.org
cc: linux-mm@...ck.org
Link: https://lore.kernel.org/r/162729351325.813557.9242842205308443901.stgit@warthog.procyon.org.uk/
---

 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 2ad91f9e2a45..9320a42dfaf9 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);