/* * 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 COUNT_ARGS(X...) COUNT_ARGS_HELPER(, ##X, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)#define COUNT_ARGS_HELPER(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, n, X...) n#define CONCAT(X, Y) X ## Y#define CONCAT_AFTER(X, Y) CONCAT(X, Y) #define ASSIGN(FN, X, N) ((X) = FN(N))#define EVAL1(FN, X) ASSIGN(FN, X, 0) /*X = FN(0)*/#define EVAL2(FN, X, Y...) do { ASSIGN(FN, X, 1);  EVAL1(FN, Y); } while (0)#define EVAL(FN, X...) CONCAT_AFTER(EVAL, COUNT_ARGS(X))(FN, 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(N) ({					\	struct aa_buffers *__cpu_var; \	AA_BUG_PREEMPT_ENABLED("__get_buffer without preempt disabled");  \	__cpu_var = this_cpu_ptr(&aa_buffers);			\	__cpu_var->buf[(N)]; }) #define __get_buffers(X...)    EVAL(__get_buffer, X) #define __put_buffers(X, Y...) ((void)&(X)) #define get_buffers(X...)	\do {				\	preempt_disable();	\	__get_buffers(X);	\} while (0) #define put_buffers(X, Y...)	\do {				\	__put_buffers(X, Y);	\	preempt_enable();	\} while (0) #endif /* __AA_PATH_H */