teach page_get_link() to work in RCU mode (d3883d4f) · Commits · 戴 / test

fs/namei.c

+13 −6

Original line number	Diff line number	Diff line
		@@ -4533,12 +4533,19 @@ const char page_get_link(struct dentry dentry, struct inode *inode,
		struct page *page;
		struct address_space *mapping = inode->i_mapping;

		if (!dentry)
		if (!dentry) {
		page = find_get_page(mapping, 0);
		if (!page)
		return ERR_PTR(-ECHILD);

		if (!PageUptodate(page)) {
		put_page(page);
		return ERR_PTR(-ECHILD);
		}
		} else {
		page = read_mapping_page(mapping, 0, NULL);
		if (IS_ERR(page))
		return (char*)page;
		}
		*cookie = page;
		BUG_ON(mapping_gfp_mask(mapping) & __GFP_HIGHMEM);
		kaddr = page_address(page);