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Commit d3883d4f authored by Al Viro's avatar Al Viro
Browse files

teach page_get_link() to work in RCU mode 



more or less along the lines of Neil's patchset, sans the insanity
around kmap().

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 6b255391

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);