security/ccsecurity/compat.h

/*
 * security/ccsecurity/compat.h
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 *
 * Version: 1.8.0-pre   2010/09/01
 *
 * 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 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

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16)
#define mutex semaphore
#define mutex_init(mutex) init_MUTEX(mutex)
#define mutex_unlock(mutex) up(mutex)
#define mutex_lock(mutex) down(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_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, 6, 34)
#undef list_for_each_entry_rcu
#define list_for_each_entry_rcu(pos, head, member)                         \
        for (pos = list_entry(srcu_dereference((head)->next, &ccs_ss),     \
                              typeof(*pos), member);                       \
             prefetch(pos->member.next), &pos->member != (head);           \
             pos = list_entry(srcu_dereference(pos->member.next, &ccs_ss), \
                              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
#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
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

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
struct path {
        struct vfsmount *mnt;
        struct dentry *dentry;
};
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)

#include <linux/mount.h>

static inline void path_get(struct path *path)
{
        dget(path->dentry);
        mntget(path->mnt);
}

static inline void path_put(struct path *path)
{
        dput(path->dentry);
        mntput(path->mnt);
}

#endif

#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 35)

#include <linux/fs_struct.h>

static inline void get_fs_root(struct fs_struct *fs, struct path *root)
{
        read_lock(&fs->lock);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25)
        *root = fs->root;
        path_get(root);
#else
        root->dentry = dget(fs->root);
        root->mnt = mntget(fs->rootmnt);
#endif
        read_unlock(&fs->lock);
}

#endif