From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 16 Nov 2015 23:26:34 +0000 (-0500)
Subject: namei: page_getlink() and page_follow_link_light() are the same thing
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=aa80deab33a8fb180e718f5e45514db19aade165;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

namei: page_getlink() and page_follow_link_light() are the same thing

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/namei.c b/fs/namei.c
index 0c3974cd3ecd..4bae5cbfaa85 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4518,7 +4518,7 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 EXPORT_SYMBOL(generic_readlink);
 
 /* get the link contents into pagecache */
-static char *page_getlink(struct dentry * dentry, struct page **ppage)
+static const char *page_getlink(struct dentry * dentry, void **cookie)
 {
 	char *kaddr;
 	struct page *page;
@@ -4526,31 +4526,15 @@ static char *page_getlink(struct dentry * dentry, struct page **ppage)
 	page = read_mapping_page(mapping, 0, NULL);
 	if (IS_ERR(page))
 		return (char*)page;
-	*ppage = page;
+	*cookie = page;
 	kaddr = kmap(page);
 	nd_terminate_link(kaddr, dentry->d_inode->i_size, PAGE_SIZE - 1);
 	return kaddr;
 }
 
-int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
-{
-	struct page *page = NULL;
-	int res = readlink_copy(buffer, buflen, page_getlink(dentry, &page));
-	if (page) {
-		kunmap(page);
-		page_cache_release(page);
-	}
-	return res;
-}
-EXPORT_SYMBOL(page_readlink);
-
 const char *page_follow_link_light(struct dentry *dentry, void **cookie)
 {
-	struct page *page = NULL;
-	char *res = page_getlink(dentry, &page);
-	if (!IS_ERR(res))
-		*cookie = page;
-	return res;
+	return page_getlink(dentry, cookie);
 }
 EXPORT_SYMBOL(page_follow_link_light);
 
@@ -4562,6 +4546,16 @@ void page_put_link(struct inode *unused, void *cookie)
 }
 EXPORT_SYMBOL(page_put_link);
 
+int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+{
+	void *cookie = NULL;
+	int res = readlink_copy(buffer, buflen, page_getlink(dentry, &cookie));
+	if (cookie)
+		page_put_link(NULL, cookie);
+	return res;
+}
+EXPORT_SYMBOL(page_readlink);
+
 /*
  * The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS
  */