From ecc087ff14352aed52b8e775b4511e7f9cfc64ec Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 7 May 2015 11:19:14 -0400
Subject: [PATCH] new helper: free_page_put_link()

similar to kfree_put_link()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/configfs/symlink.c | 7 +------
 fs/fuse/dir.c         | 7 +------
 fs/kernfs/symlink.c   | 7 +------
 fs/libfs.c            | 6 ++++++
 include/linux/fs.h    | 1 +
 5 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index bc464c26e00e..ec5c8325b503 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -296,15 +296,10 @@ static const char *configfs_follow_link(struct dentry *dentry, void **cookie)
 	return ERR_PTR(error);
 }
 
-static void configfs_put_link(struct inode *unused, void *cookie)
-{
-	free_page((unsigned long)cookie);
-}
-
 const struct inode_operations configfs_symlink_inode_operations = {
 	.follow_link = configfs_follow_link,
 	.readlink = generic_readlink,
-	.put_link = configfs_put_link,
+	.put_link = free_page_put_link,
 	.setattr = configfs_setattr,
 };
 
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 9e704c124392..5e2e08712d3b 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1395,11 +1395,6 @@ static const char *fuse_follow_link(struct dentry *dentry, void **cookie)
 	return link;
 }
 
-static void fuse_put_link(struct inode *unused, void *cookie)
-{
-	free_page((unsigned long) cookie);
-}
-
 static int fuse_dir_open(struct inode *inode, struct file *file)
 {
 	return fuse_open_common(inode, file, true);
@@ -1915,7 +1910,7 @@ static const struct inode_operations fuse_common_inode_operations = {
 static const struct inode_operations fuse_symlink_inode_operations = {
 	.setattr	= fuse_setattr,
 	.follow_link	= fuse_follow_link,
-	.put_link	= fuse_put_link,
+	.put_link	= free_page_put_link,
 	.readlink	= generic_readlink,
 	.getattr	= fuse_getattr,
 	.setxattr	= fuse_setxattr,
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index f6aa2e5a76b4..db272528ab5b 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -126,11 +126,6 @@ static const char *kernfs_iop_follow_link(struct dentry *dentry, void **cookie)
 	return *cookie = (char *)page;
 }
 
-static void kernfs_iop_put_link(struct inode *unused, void *cookie)
-{
-	free_page((unsigned long)cookie);
-}
-
 const struct inode_operations kernfs_symlink_iops = {
 	.setxattr	= kernfs_iop_setxattr,
 	.removexattr	= kernfs_iop_removexattr,
@@ -138,7 +133,7 @@ const struct inode_operations kernfs_symlink_iops = {
 	.listxattr	= kernfs_iop_listxattr,
 	.readlink	= generic_readlink,
 	.follow_link	= kernfs_iop_follow_link,
-	.put_link	= kernfs_iop_put_link,
+	.put_link	= free_page_put_link,
 	.setattr	= kernfs_iop_setattr,
 	.getattr	= kernfs_iop_getattr,
 	.permission	= kernfs_iop_permission,
diff --git a/fs/libfs.c b/fs/libfs.c
index 01c337b0fec8..65e1feca8b98 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1030,6 +1030,12 @@ void kfree_put_link(struct inode *unused, void *cookie)
 }
 EXPORT_SYMBOL(kfree_put_link);
 
+void free_page_put_link(struct inode *unused, void *cookie)
+{
+	free_page((unsigned long) cookie);
+}
+EXPORT_SYMBOL(free_page_put_link);
+
 /*
  * nop .set_page_dirty method so that people can use .page_mkwrite on
  * anon inodes.
diff --git a/include/linux/fs.h b/include/linux/fs.h
index f21e3328f991..8f738512c874 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2712,6 +2712,7 @@ extern int __page_symlink(struct inode *inode, const char *symname, int len,
 extern int page_symlink(struct inode *inode, const char *symname, int len);
 extern const struct inode_operations page_symlink_inode_operations;
 extern void kfree_put_link(struct inode *, void *);
+extern void free_page_put_link(struct inode *, void *);
 extern int generic_readlink(struct dentry *, char __user *, int);
 extern void generic_fillattr(struct inode *, struct kstat *);
 int vfs_getattr_nosec(struct path *path, struct kstat *stat);