f2fs: allow to read node block after shutdown

commit e6ecb14 upstream.

If block address is still alive, we should give a valid node block even after
shutdown. Otherwise, we can see zero data when reading out a file.

Cc: stable@vger.kernel.org
Fixes: 83a3bfd ("f2fs: indicate shutdown f2fs to allow unmount successfully")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/f2fs/node.c

@@ -1357,8 +1357,7 @@ static int read_node_page(struct page *page, int op_flags)
 		return err;
 
 	/* NEW_ADDR can be seen, after cp_error drops some dirty node pages */
-	if (unlikely(ni.blk_addr == NULL_ADDR || ni.blk_addr == NEW_ADDR) ||
-			is_sbi_flag_set(sbi, SBI_IS_SHUTDOWN)) {
+	if (unlikely(ni.blk_addr == NULL_ADDR || ni.blk_addr == NEW_ADDR)) {
 		ClearPageUptodate(page);
 		return -ENOENT;
 	}