f2fs: return early when trying to read null nid



If get_node_page() gets zero nid, we can return early without getting a wrong
page. For example, get_dnode_of_data() can try to do that.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 2aadac08

fs/f2fs/node.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1059,6 +1059,10 @@ struct page get_node_page(struct f2fs_sb_info sbi, pgoff_t nid)
		{
		struct page *page;
		int err;

		if (!nid)
		return ERR_PTR(-ENOENT);
		f2fs_bug_on(sbi, check_nid_range(sbi, nid));
		repeat:
		page = grab_cache_page(NODE_MAPPING(sbi), nid);
		if (!page)