security/ccsecurity/compat.h

/*
 * fs/ccsecurity/compat.h
 *
 * Copyright (C) 2005-2009  NTT DATA CORPORATION
 *
 * Version: 1.7.0-pre   2009/07/03
 *
 * This file is applicable to both 2.4.30 and 2.6.11 and later.
 * See README.ccs for ChangeLog.
 *
 */

#define false 0
#define true 1

#ifndef __user
#define __user
#endif

#ifndef current_uid
#define current_uid()           (current->uid)
#endif
#ifndef current_gid
#define current_gid()           (current->gid)
#endif
#ifndef current_euid
#define current_euid()          (current->euid)
#endif
#ifndef current_egid
#define current_egid()          (current->egid)
#endif
#ifndef current_suid
#define current_suid()          (current->suid)
#endif
#ifndef current_sgid
#define current_sgid()          (current->sgid)
#endif
#ifndef current_fsuid
#define current_fsuid()         (current->fsuid)
#endif
#ifndef current_fsgid
#define current_fsgid()         (current->fsgid)
#endif

#ifndef WARN_ON
#define WARN_ON(x) do { } while (0)
#endif

#ifndef DEFINE_SPINLOCK
#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
#define bool _Bool
#endif

#ifndef KERN_CONT
#define KERN_CONT ""
#endif

/* To support PID namespace. */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
#define find_task_by_pid find_task_by_vpid
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16)
#define mutex semaphore
#define mutex_init(mutex) init_MUTEX(mutex)
#define mutex_lock(mutex) down(mutex)
#define mutex_unlock(mutex) up(mutex)
#define mutex_lock_interruptible(mutex) down_interruptible(mutex)
#define mutex_trylock(mutex) !down_trylock(mutex)
#define DEFINE_MUTEX(mutexname) DECLARE_MUTEX(mutexname)
#endif

#ifndef container_of
#define container_of(ptr, type, member) ({                              \
                        const typeof(((type *)0)->member) *__mptr = (ptr); \
                        (type *)((char *)__mptr - offsetof(type, member)); })
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14)
#define kzalloc(size, flags) ({                                         \
                        void *ret = kmalloc((size), (flags));           \
                        if (ret)                                        \
                                memset(ret, 0, (size));                 \
                        ret; })
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
#define smp_read_barrier_depends smp_rmb
#endif

#ifndef ACCESS_ONCE
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
#endif

#ifndef rcu_dereference
#define rcu_dereference(p)     ({ \
                                typeof(p) _________p1 = ACCESS_ONCE(p); \
                                smp_read_barrier_depends(); /* see RCU */ \
                                (_________p1); \
                                })
#endif

#ifndef rcu_assign_pointer
#define rcu_assign_pointer(p, v) \
        ({ \
                if (!__builtin_constant_p(v) || \
                    ((v) != NULL)) \
                        smp_wmb(); /* see RCU */ \
                (p) = (v); \
        })
#endif

#ifndef list_for_each_rcu
#define list_for_each_rcu(pos, head) \
        for (pos = rcu_dereference((head)->next); \
                prefetch(pos->next), pos != (head); \
                pos = rcu_dereference(pos->next))
#endif

#ifndef list_for_each_entry_rcu
#define list_for_each_entry_rcu(pos, head, member) \
        for (pos = list_entry(rcu_dereference((head)->next), typeof(*pos), \
                member); \
                prefetch(pos->member.next), &pos->member != (head); \
                pos = list_entry(rcu_dereference(pos->member.next), \
                typeof(*pos), member))
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
static inline void __list_add_rcu(struct list_head *new,
                                  struct list_head *prev,
                                  struct list_head *next)
{
        new->next = next;
        new->prev = prev;
        rcu_assign_pointer(prev->next, new);
        next->prev = new;
}

static inline void list_add_tail_rcu(struct list_head *new,
                                     struct list_head *head)
{
        __list_add_rcu(new, head->prev, head);
}

static inline void list_add_rcu(struct list_head *new, struct list_head *head)
{
        __list_add_rcu(new, head, head->next);
}

#ifndef LIST_POISON2
#define LIST_POISON2  ((void *) 0x00200200)
#endif

static inline void list_del_rcu(struct list_head *entry)
{
        __list_del(entry->prev, entry->next);
        entry->prev = LIST_POISON2;
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 30)
#undef ssleep
#define ssleep(secs) {                              \
        set_current_state(TASK_UNINTERRUPTIBLE);    \
        schedule_timeout((HZ * secs) + 1);          \
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
#define s_fs_info u.generic_sbp
#else
#include <linux/audit.h>
#ifdef AUDIT_APPARMOR_AUDIT
/* AppArmor patch adds "struct vfsmount" to VFS helper functions. */
#define HAVE_VFSMOUNT_IN_VFS_HELPER
#endif
#endif

#if defined(RHEL_MAJOR) && RHEL_MAJOR == 5
#define HAVE_NO_I_BLKSIZE_IN_INODE
#elif defined(AX_MAJOR) && AX_MAJOR == 3
#define HAVE_NO_I_BLKSIZE_IN_INODE
#endif

#ifndef list_for_each_entry_safe
#define list_for_each_entry_safe(pos, n, head, member)                  \
        for (pos = list_entry((head)->next, typeof(*pos), member),      \
                     n = list_entry(pos->member.next, typeof(*pos), member); \
             &pos->member != (head);                                    \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
#define sk_family family
#define sk_protocol protocol
#define sk_type type
#define sk_receive_queue receive_queue
static inline struct socket *SOCKET_I(struct inode *inode)
{
        return inode->i_sock ? &inode->u.socket_i : NULL;
}
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
#if defined(__LITTLE_ENDIAN)
#define HIPQUAD(addr) \
        ((unsigned char *)&addr)[3], \
        ((unsigned char *)&addr)[2], \
        ((unsigned char *)&addr)[1], \
        ((unsigned char *)&addr)[0]
#elif defined(__BIG_ENDIAN)
#define HIPQUAD NIPQUAD
#else
#error "Please fix asm/byteorder.h"
#endif /* __LITTLE_ENDIAN */
#endif

#ifndef _LINUX_SRCU_H

struct srcu_struct {
        int counter_idx;
        int counter[2];
};

static inline int init_srcu_struct(struct srcu_struct *sp)
{
        return 0;
}

int srcu_read_lock(struct srcu_struct *sp);
void srcu_read_unlock(struct srcu_struct *sp, const int idx);
void synchronize_srcu(struct srcu_struct *sp);

#endif