f2fs: fix f2fs_ioc_abort_volatile_write

There are two rules to handle aborting volatile or atomic writes.

1. drop atomic writes
 - we don't need to keep any stale db data.

2. write journal data
 - we should keep the journal data with fsync for db recovery.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -1433,9 +1433,14 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
 	if (ret)
 		return ret;
 
+	if (f2fs_is_atomic_file(inode)) {
 		clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
-	clear_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
 		commit_inmem_pages(inode, true);
+	}
+	if (f2fs_is_volatile_file(inode)) {
+		clear_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
+		ret = f2fs_sync_file(filp, 0, LLONG_MAX, 0);
+	}
 
 	mnt_drop_write_file(filp);
 	return ret;