f2fs: avoid race in between atomic_read & atomic_inc

Previously, we will miss merging flush command during fsync due to below
race condition:

Thread A 		Thread B		Thread C
- f2fs_issue_flush
 - atomic_read(&issing_flush)
			- f2fs_issue_flush
			 - atomic_read(&issing_flush)
						- f2fs_issue_flush
						 - atomic_read(&issing_flush)
  - atomic_inc(&issing_flush)
			  - atomic_inc(&issing_flush)
						  - atomic_inc(&issing_flush)
   - submit_flush_wait
			   - submit_flush_wait
						   - submit_flush_wait

It needs to use atomic_inc_return instead to avoid such race.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index d6c3f45..1215ca1 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -536,8 +536,7 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
                return ret;
        }
 
-       if (!atomic_read(&fcc->issing_flush)) {
-               atomic_inc(&fcc->issing_flush);
+       if (atomic_inc_return(&fcc->issing_flush) == 1) {
                ret = submit_flush_wait(sbi);
                atomic_dec(&fcc->issing_flush);
 
@@ -547,7 +546,6 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
 
        init_completion(&cmd.wait);
 
-       atomic_inc(&fcc->issing_flush);
        llist_add(&cmd.llnode, &fcc->issue_list);
 
        /* update issue_list before we wake up issue_flush thread */