From d067633b4483f3c7d971d8f889f35340a8635bb5 Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Mon, 22 Mar 2010 19:33:43 +0900
Subject: [PATCH] nilfs2: fix imperfect completion wait in nilfs_wait_on_logs
nilfs_wait_on_logs has a potential to slip out before completion of
all bio requests when it met an error. This synchronization fault may
cause unexpected results, for instance, violative access to freed
segment buffers from an end-bio callback routine.
This fixes the issue by ensuring that nilfs_wait_on_logs waits all
given logs.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
---
fs/nilfs2/segbuf.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 636eaafd6ea2..6129a431aa34 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -323,14 +323,14 @@ int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)
int nilfs_wait_on_logs(struct list_head *logs)
{
struct nilfs_segment_buffer *segbuf;
- int err;
+ int err, ret = 0;
list_for_each_entry(segbuf, logs, sb_list) {
err = nilfs_segbuf_wait(segbuf);
- if (err)
- return err;
+ if (err && !ret)
+ ret = err;
}
- return 0;
+ return ret;
}
/*