enable passing fast relative symlinks without dropping out of RCU mode
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index d9f77ff..bf46e10 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -975,11 +975,6 @@
touch_atime(&last->link);
}
- if (nd->flags & LOOKUP_RCU) {
- if (unlikely(unlazy_walk(nd, NULL, 0)))
- return ERR_PTR(-ECHILD);
- }
-
error = security_inode_follow_link(dentry, inode,
nd->flags & LOOKUP_RCU);
if (unlikely(error))
@@ -988,6 +983,10 @@
nd->last_type = LAST_BIND;
res = inode->i_link;
if (!res) {
+ if (nd->flags & LOOKUP_RCU) {
+ if (unlikely(unlazy_walk(nd, NULL, 0)))
+ return ERR_PTR(-ECHILD);
+ }
res = inode->i_op->follow_link(dentry, &last->cookie);
if (IS_ERR_OR_NULL(res)) {
last->cookie = NULL;
@@ -995,6 +994,10 @@
}
}
if (*res == '/') {
+ if (nd->flags & LOOKUP_RCU) {
+ if (unlikely(unlazy_walk(nd, NULL, 0)))
+ return ERR_PTR(-ECHILD);
+ }
if (!nd->root.mnt)
set_root(nd);
path_put(&nd->path);