During checkpoint=disable period, f2fs bypasses all the synchronous IOs such as sync and fsync. So, when enabling it back, we must flush all of them in order to keep the data persistent. Otherwise, suddern power-cut right after enabling checkpoint will cause data loss.

Fixes: 4354994f097d ("f2fs: checkpoint disabling") Cc: stable@vger.kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org --- fs/f2fs/super.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 359cc5a2f8f5..073b51af62c8 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1887,6 +1887,9 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)

static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi) { + /* we should flush all the data to keep data consistency */ + sync_inodes_sb(sbi->sb); + down_write(&sbi->gc_lock); f2fs_dirty_to_prefree(sbi);