f2fs: introduce cp_lock to protect updating of ckpt_flags

This patch introduces spinlock to protect updating process of ckpt_flags
field in struct f2fs_checkpoint, it avoids incorrectly updating in race
condition.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
[Jaegeuk Kim: add __is_set_ckpt_flags likewise __set_ckpt_flags]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 2d23d7b17d6c..e78501ca761e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1801,7 +1801,7 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
         int type = CURSEG_HOT_DATA;
         int err;
 
-        if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) {
+        if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG)) {
                 int npages = npages_for_summary_flush(sbi, true);
 
                 if (npages >= 2)
@@ -1898,7 +1898,7 @@ static void write_normal_summaries(struct f2fs_sb_info *sbi,
 
 void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
 {
-        if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG))
+        if (is_set_ckpt_flags(sbi, CP_COMPACT_SUM_FLAG))
                 write_compacted_summaries(sbi, start_blk);
         else
                 write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);