linux-kernel - [PATCH AUTOSEL for 4.4 032/101] NFS: Fix missing pg_cleanup after nfs_pageio_cond

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Message-ID: <20180308050023.8548-32-alexander.levin@microsoft.com>
Date:   Thu, 8 Mar 2018 05:01:37 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Benjamin Coddington <bcodding@...hat.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 032/101] NFS: Fix missing pg_cleanup after
 nfs_pageio_cond_complete()

From: Benjamin Coddington <bcodding@...hat.com>

[ Upstream commit 43b7d964ed30dbca5c83c90cb010985b429ec4f9 ]

Commit a7d42ddb3099727f58366fa006f850a219cce6c8 ("nfs: add mirroring
support to pgio layer") moved pg_cleanup out of the path when there was
non-sequental I/O that needed to be flushed.  The result is that for
layouts that have more than one layout segment per file, the pg_lseg is not
cleared, so we can end up hitting the WARN_ON_ONCE(req_start >= seg_end) in
pnfs_generic_pg_test since the pg_lseg will be pointing to that
previously-flushed layout segment.

Signed-off-by: Benjamin Coddington <bcodding@...hat.com>
Fixes: a7d42ddb3099 ("nfs: add mirroring support to pgio layer")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 fs/nfs/pagelist.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 8ebfdd00044b..4bdc2fc86280 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -1273,8 +1273,10 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
 		mirror = &desc->pg_mirrors[midx];
 		if (!list_empty(&mirror->pg_list)) {
 			prev = nfs_list_entry(mirror->pg_list.prev);
-			if (index != prev->wb_index + 1)
-				nfs_pageio_complete_mirror(desc, midx);
+			if (index != prev->wb_index + 1) {
+				nfs_pageio_complete(desc);
+				break;
+			}
 		}
 	}
 }
-- 
2.14.1