The patch below does not apply to the 3.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 05f54903d9d370a4cd302a85681304d3ec59e5c1 Mon Sep 17 00:00:00 2001
From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Date: Thu, 9 Apr 2015 23:02:17 +0800
Subject: [PATCH] nfs: remove WARN_ON_ONCE from nfs_direct_good_bytes
For flexfiles driver, we might choose to read from mirror index other
than 0 while mirror_count is always 1 for read.
Reported-by: Jean Spector <jean@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.19+
Cc: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index e97a67e40b48..eeb52b434e6f 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -129,8 +129,6 @@ nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
int i;
ssize_t count;
- WARN_ON_ONCE(hdr->pgio_mirror_idx >= dreq->mirror_count);
-
if (dreq->mirror_count == 1) {
dreq->mirrors[hdr->pgio_mirror_idx].count += hdr->good_bytes;
dreq->count += hdr->good_bytes;
--
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