devcgroup_inode_permission: take "is it a device node" checks to inlined wrapper

inode_permission() calls devcgroup_inode_permission() and almost all such
calls are _not_ for device nodes; let's at least keep the common path
straight...

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

diff --git a/include/linux/device_cgroup.h b/include/linux/device_cgroup.h
index 0b0d9c3..7aad1f4 100644 (file)
--- a/include/linux/device_cgroup.h
+++ b/include/linux/device_cgroup.h
@@ -2,8 +2,16 @@
 #include <linux/fs.h>
 
 #ifdef CONFIG_CGROUP_DEVICE
-extern int devcgroup_inode_permission(struct inode *inode, int mask);
+extern int __devcgroup_inode_permission(struct inode *inode, int mask);
 extern int devcgroup_inode_mknod(int mode, dev_t dev);
+static inline int devcgroup_inode_permission(struct inode *inode, int mask)
+{
+       if (likely(!inode->i_rdev))
+               return 0;
+       if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
+               return 0;
+       return __devcgroup_inode_permission(inode, mask);
+}
 #else
 static inline int devcgroup_inode_permission(struct inode *inode, int mask)
 { return 0; }

diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index cd1f779..1be6826 100644 (file)
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -474,17 +474,11 @@ struct cgroup_subsys devices_subsys = {
        .subsys_id = devices_subsys_id,
 };
 
-int devcgroup_inode_permission(struct inode *inode, int mask)
+int __devcgroup_inode_permission(struct inode *inode, int mask)
 {
        struct dev_cgroup *dev_cgroup;
        struct dev_whitelist_item *wh;
 
-       dev_t device = inode->i_rdev;
-       if (!device)
-               return 0;
-       if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
-               return 0;
-
        rcu_read_lock();
 
        dev_cgroup = task_devcgroup(current);