From d3883d4f93449343be6296e2274360db39b6842a Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 17 Nov 2015 10:41:04 -0500 Subject: 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: Al Viro --- fs/namei.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index 1da3064311e2..8f517888c3e1 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -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) - return ERR_PTR(-ECHILD); - - page = read_mapping_page(mapping, 0, NULL); - if (IS_ERR(page)) - return (char*)page; + 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); -- cgit v1.2.3