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

[Chao Yu]

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 <yuch...@huawei.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