namei: don't bother with ->follow_link() if ->i_link is set

with new calling conventions it's trivial

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Conflicts:
	fs/namei.c

diff --git a/fs/namei.c b/fs/namei.c
index a1ba556..2ffb4af 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -865,11 +865,14 @@ get_link(struct path *link, struct nameidata *nd, void **p)
 
        nd->last_type = LAST_BIND;
        *p = NULL;
-       res = inode->i_op->follow_link(dentry, p, nd);
-       if (IS_ERR(res)) {
+       res = inode->i_link;
+       if (!res) {
+               res = inode->i_op->follow_link(dentry, p, nd);
+               if (IS_ERR(res)) {
 out:
-               path_put(&nd->path);
-               path_put(link);
+                       path_put(&nd->path);
+                       path_put(link);
+               }
        }
        return res;
 }
@@ -4418,11 +4421,14 @@ EXPORT_SYMBOL(readlink_copy);
 int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 {
        void *cookie;
-       const char *link = dentry->d_inode->i_op->follow_link(dentry, &cookie, NULL);
+       const char *link = dentry->d_inode->i_link;
        int res;
 
-       if (IS_ERR(link))
-               return PTR_ERR(link);
+       if (!link) {
+               link = dentry->d_inode->i_op->follow_link(dentry, &cookie, NULL);
+               if (IS_ERR(link))
+                       return PTR_ERR(link);
+       }
        res = readlink_copy(buffer, buflen, link);
        if (cookie && dentry->d_inode->i_op->put_link)
                dentry->d_inode->i_op->put_link(dentry, cookie);