From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Al Viro To: linux-kernel@vger.kernel.org Cc: Linus Torvalds , Neil Brown , linux-fsdevel@vger.kernel.org Subject: [PATCH v2 08/11] teach page_get_link() to work in RCU mode Date: Wed, 9 Dec 2015 05:34:52 +0000 Message-Id: <1449639295-20512-8-git-send-email-viro@ZenIV.linux.org.uk> In-Reply-To: <20151209053209.GV20997@ZenIV.linux.org.uk> References: <20151209053209.GV20997@ZenIV.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Al Viro 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(-) diff --git a/fs/namei.c b/fs/namei.c index 1da3064..8f51788 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); -- 2.1.4