linux-kernel - [PATCH 1/2] f2fs: fix to avoid race in between aio and gc

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Date:   Wed, 23 Aug 2017 18:23:24 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 1/2] f2fs: fix to avoid race in between aio and gc

We won't wait DIO synchronously when doing AIO, so there will be potential
IO reorder in between AIO and GC, which will cause data corruption.

This patch adds inode_dio_wait to serialize aio and data GC to avoid this
issue.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/gc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 57bea2182f30..cd147e7c71e8 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -875,6 +875,9 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 					continue;
 				}
 				locked = true;
+
+				/* wait for all inflight aio data */
+				inode_dio_wait(inode);
 			}
 
 			start_bidx = start_bidx_of_node(nofs, inode)
-- 
2.13.1.388.g69e6b9b4f4a9