/* * AppArmor security module * * This file contains AppArmor basic path manipulation function definitions. * * Copyright (C) 1998-2008 Novell/SUSE * Copyright 2009-2010 Canonical Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. */ #ifndef __AA_PATH_H#define __AA_PATH_H  enum path_flags {	PATH_IS_DIR = 0x1,		/* path is a directory */	PATH_CONNECT_PATH = 0x4,	/* connect disconnected paths to / */	PATH_CHROOT_REL = 0x8,		/* do path lookup relative to chroot */	PATH_CHROOT_NSCONNECT = 0x10,	/* connect paths that are at ns root */ 	PATH_DELEGATE_DELETED = 0x08000, /* delegate deleted files */	PATH_MEDIATE_DELETED = 0x10000,	 /* mediate deleted paths */}; int aa_path_name(const struct path *path, int flags, char *buffer,		 const char **name, const char **info,		 const char *disconnected); #define MAX_PATH_BUFFERS 2 /* Per cpu buffers used during mediation *//* preallocated buffers to use during path lookups */struct aa_buffers {	char *buf[MAX_PATH_BUFFERS];}; #include <linux/percpu.h>#include <linux/preempt.h> DECLARE_PER_CPU(struct aa_buffers, aa_buffers); #define ASSIGN(FN, A, X, N) ((X) = FN(A, N))#define EVAL1(FN, A, X) ASSIGN(FN, A, X, 0) /*X = FN(0)*/#define EVAL2(FN, A, X, Y...)	\	do { ASSIGN(FN, A, X, 1);  EVAL1(FN, A, Y); } while (0)#define EVAL(FN, A, X...) CONCATENATE(EVAL, COUNT_ARGS(X))(FN, A, X) #define for_each_cpu_buffer(I) for ((I) = 0; (I) < MAX_PATH_BUFFERS; (I)++) #ifdef CONFIG_DEBUG_PREEMPT#define AA_BUG_PREEMPT_ENABLED(X) AA_BUG(preempt_count() <= 0, X)#else#define AA_BUG_PREEMPT_ENABLED(X) /* nop */#endif #define __get_buffer(C, N) ({						\	AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled");  \	(C)->buf[(N)]; }) #define __get_buffers(C, X...)    EVAL(__get_buffer, C, X) #define __put_buffers(X, Y...) ((void)&(X)) #define get_buffers(X...)						\do {									\	struct aa_buffers *__cpu_var = get_cpu_ptr(&aa_buffers);	\	__get_buffers(__cpu_var, X);					\} while (0) #define put_buffers(X, Y...)		\do {					\	__put_buffers(X, Y);		\	put_cpu_ptr(&aa_buffers);	\} while (0) #endif /* __AA_PATH_H */