From 66daf9cdbc8a6eff03248403cfada84f08f5a4dd Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Tue, 30 Sep 2008 12:59:27 -0700
Subject: [PATCH] kclient: be more paranoid in prepare_pages

It's theoretically possible to get racing incoming osd_op_replies.  Make sure we only give the pages away once.
---
 src/kernel/osd_client.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/kernel/osd_client.c b/src/kernel/osd_client.c
index 83c8153cf05c6..61967c8c59720 100644
--- a/src/kernel/osd_client.c
+++ b/src/kernel/osd_client.c
@@ -512,7 +512,8 @@ int ceph_osdc_prepare_pages(void *p, struct ceph_msg *m, int want)
 	}
 	dout(10, "prepare_pages tid %llu have %d pages, want %d\n",
 	     tid, req->r_num_pages, want);
-	if (likely(req->r_num_pages >= want)) {
+	if (likely(req->r_num_pages >= want &&
+		   req->r_reply == 0)) {
 		m->pages = req->r_pages;
 		m->nr_pages = req->r_num_pages;
 		ceph_msg_get(m);
-- 
2.39.5