linux-kernel - [PATCH 3.16 055/127] NFS: Fix a bogus warning in nfs_generic

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Message-Id: <20141028033423.289793222@linuxfoundation.org>
Date:	Tue, 28 Oct 2014 11:34:50 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Steve Dickson <SteveD@...hat.com>,
	Weston Andros Adamson <dros@...marydata.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 3.16 055/127] NFS: Fix a bogus warning in nfs_generic_pgio

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trond.myklebust@...marydata.com>

commit b8fb9c30f25e45dab5d2cd310ab6913b6861d00f upstream.

It is OK for pageused == pagecount in the loop, as long as we don't add
another entry to the *pages array. Move the test so that it only triggers
in that case.

Reported-by: Steve Dickson <SteveD@...hat.com>
Fixes: bba5c1887a92 (nfs: disallow duplicate pages in pgio page vectors)
Cc: Weston Andros Adamson <dros@...marydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/pagelist.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -754,12 +754,11 @@ int nfs_generic_pgio(struct nfs_pageio_d
 		nfs_list_remove_request(req);
 		nfs_list_add_request(req, &hdr->pages);
 
-		if (WARN_ON_ONCE(pageused >= pagecount))
-			return nfs_pgio_error(desc, hdr);
-
 		if (!last_page || last_page != req->wb_page) {
-			*pages++ = last_page = req->wb_page;
 			pageused++;
+			if (pageused > pagecount)
+				break;
+			*pages++ = last_page = req->wb_page;
 		}
 	}
 	if (WARN_ON_ONCE(pageused != pagecount))


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