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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-17 18:41:04 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-09 06:41:54 +0300
commitd3883d4f93449343be6296e2274360db39b6842a (patch)
tree0d98e047483082320ca32133d5517157a4800d64 /fs/namei.c
parent6b2553918d8b4e6de9853fd6315bec7271a2e592 (diff)
downloadlinux-d3883d4f93449343be6296e2274360db39b6842a.tar.xz
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 <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c19
1 files changed, 13 insertions, 6 deletions
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);