f2fs: fix to let checkpoint guarantee atomic page persistence

1. thread A: commit_inmem_pages submit data into block layer, but
haven't waited it writeback.
2. thread A: commit_inmem_pages update related node.
3. thread B: do checkpoint, flush all nodes to disk.
4. SPOR

Then, atomic file becomes corrupted since nodes is flushed before data.

This patch fixes to treat atomic page as checkpoint guaranteed one,
then in checkpoint, we can make sure all atomic page can be writebacked
with metadata of atomic file.

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

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 865fb4df14aada4a5b9b48c7de826a2f451e97e4..3e7f4bc9fc658bb9c2ca1fede7f496a942f22dfc 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -48,6 +48,8 @@ static bool __is_cp_guaranteed(struct page *page)
        if (inode->i_ino == F2FS_META_INO(sbi) ||
                        inode->i_ino ==  F2FS_NODE_INO(sbi) ||
                        S_ISDIR(inode->i_mode) ||
+                       (S_ISREG(inode->i_mode) &&
+                       is_inode_flag_set(inode, FI_ATOMIC_FILE)) ||
                        is_cold_data(page))
                return true;
        return false;