C++ put_group_info函数代码示例

/* Set the cred info into the current task */
void
crset(cred_t * cr)
{
#if defined(STRUCT_TASK_STRUCT_HAS_CRED)
    struct cred *new_creds;

    /* If our current task doesn't have identical real and effective
     * credentials, commit_cred won't let us change them, so we just
     * bail here.
     */
    if (current->cred != current->real_cred)
        return;
    new_creds = prepare_creds();
    /* Drop the reference to group_info - we'll overwrite it in afs_copy_creds */
    put_group_info(new_creds->group_info);
    afs_copy_creds(new_creds, current_cred());

    commit_creds(new_creds);
#else
    struct group_info *old_info;

    current->fsuid = afs_cr_uid(cr);
    current->uid = afs_cr_ruid(cr);
    current->fsgid = afs_cr_gid(cr);
    current->gid = afs_cr_rgid(cr);

    get_group_info(afs_cr_group_info(cr));
    task_lock(current);
    old_info = current->group_info;
    current->group_info = afs_cr_group_info(cr);
    task_unlock(current);
    put_group_info(old_info);
#endif
}

asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist)
{
	int i = 0;

	/*
	 *	SMP: Nobody else can change our grouplist. Thus we are
	 *	safe.
	 */

	if (gidsetsize < 0)
		return -EINVAL;

	/* no need to grab task_lock here; it cannot change */
	get_group_info(current->group_info);
	i = current->group_info->ngroups;
	if (gidsetsize) {
		if (i > gidsetsize) {
			i = -EINVAL;
			goto out;
		}
		if (groups_to_user(grouplist, current->group_info)) {
			i = -EFAULT;
			goto out;
		}
	}
out:
	put_group_info(current->group_info);
	return i;
}

int in_egroup_p(gid_t grp)
{
	int retval = 1;
	if (grp != current->egid) {
		get_group_info(current->group_info);
		retval = groups_search(current->group_info, grp);
		put_group_info(current->group_info);
	}
	return retval;
}

/*
 * Return an array of supplemental gids.  The returned address is safe
 * to use as long as the caller has taken a reference with crhold().
 * The caller is responsible for releasing the reference with crfree().
 */
gid_t *
crgetgroups(const cred_t *cr)
{
	struct group_info *gi;
	gid_t *gids;

	gi = get_group_info(cr->group_info);
	gids = gi->blocks[0];
	put_group_info(gi);

	return gids;
}

void
crfree(cred_t * cr)
{
#if defined(STRUCT_TASK_STRUCT_HAS_CRED)
    put_cred(cr);
#else
    if (atomic_dec_and_test(&cr->cr_ref)) {
        put_group_info(afs_cr_group_info(cr));
        kfree(cr);
    }
#endif
}

/* Check if the passed gid is available is in supplied credential. */
int
groupmember(gid_t gid, const cred_t *cr)
{
	struct group_info *gi;
	int rc;

	gi = get_group_info(cr->group_info);
	rc = cr_groups_search(cr->group_info, gid);
	put_group_info(gi);

	return rc;
}

/* Return the number of supplemental groups */
int
crgetngroups(const cred_t *cr)
{
	struct group_info *gi;
	int rc;

	gi = get_group_info(cr->group_info);
	rc = gi->ngroups;
	put_group_info(gi);

	return rc;
}

void __put_task_struct(struct task_struct *tsk)
{
	WARN_ON(!(tsk->state & (TASK_DEAD | TASK_ZOMBIE)));
	WARN_ON(atomic_read(&tsk->usage));
	WARN_ON(tsk == current);

	if (unlikely(tsk->audit_context))
		audit_free(tsk);
	security_task_free(tsk);
	free_uid(tsk->user);
	put_group_info(tsk->group_info);
	free_task(tsk);
}

static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
				struct pid *pid, struct task_struct *p)
{
	struct group_info *group_info;
	int g;
	struct fdtable *fdt = NULL;
	pid_t ppid, tpid;

	rcu_read_lock();
	ppid = pid_alive(p) ?
		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
	tpid = 0;
	if (pid_alive(p)) {
		struct task_struct *tracer = tracehook_tracer_task(p);
		if (tracer)
			tpid = task_pid_nr_ns(tracer, ns);
	}
	seq_printf(m,
		"State:\t%s\n"
		"Tgid:\t%d\n"
		"Pid:\t%d\n"
		"PPid:\t%d\n"
		"TracerPid:\t%d\n"
		"Uid:\t%d\t%d\t%d\t%d\n"
		"Gid:\t%d\t%d\t%d\t%d\n",
		get_task_state(p),
		task_tgid_nr_ns(p, ns),
		pid_nr_ns(pid, ns),
		ppid, tpid,
		p->uid, p->euid, p->suid, p->fsuid,
		p->gid, p->egid, p->sgid, p->fsgid);

	task_lock(p);
	if (p->files)
		fdt = files_fdtable(p->files);
	seq_printf(m,
		"FDSize:\t%d\n"
		"Groups:\t",
		fdt ? fdt->max_fds : 0);
	rcu_read_unlock();

	group_info = p->group_info;
	get_group_info(group_info);
	task_unlock(p);

	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
		seq_printf(m, "%d ", GROUP_AT(group_info, g));
	put_group_info(group_info);

	seq_printf(m, "\n");
}

void
crfree(cred_t * cr)
{
    if (cr->cr_ref > 1) {
	cr->cr_ref--;
	return;
    }

#if defined(AFS_LINUX26_ENV)
    put_group_info(cr->cr_group_info);
#endif

    kfree(cr);
}

void __put_task_struct(struct task_struct *tsk)
{
	WARN_ON(!(tsk->exit_state & (EXIT_DEAD | EXIT_ZOMBIE)));
	WARN_ON(atomic_read(&tsk->usage));
	WARN_ON(tsk == current);

	if (unlikely(tsk->audit_context))
		audit_free(tsk);
	security_task_free(tsk);
	free_uid(tsk->user);
	put_group_info(tsk->group_info);

	if (!profile_handoff_task(tsk))
		free_task(tsk);
}

asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
{
    struct group_info *group_info;
    int retval;

    if (!capable(CAP_SETGID))
        return -EPERM;
    if ((unsigned)gidsetsize > NGROUPS_MAX)
        return -EINVAL;

    group_info = groups_alloc(gidsetsize);
    if (!group_info)
        return -ENOMEM;
    retval = groups16_from_user(group_info, grouplist);
    if (retval) {
        put_group_info(group_info);
        return retval;
    }

    retval = set_current_groups(group_info);
    put_group_info(group_info);

    return retval;
}

static void mdt_identity_entry_free(struct upcall_cache *cache,
				    struct upcall_cache_entry *entry)
{
	struct md_identity *identity = &entry->u.identity;

	if (identity->mi_ginfo) {
		put_group_info(identity->mi_ginfo);
		identity->mi_ginfo = NULL;
	}

	if (identity->mi_nperms) {
		LASSERT(identity->mi_perms);
		OBD_FREE(identity->mi_perms,
			 identity->mi_nperms * sizeof(struct md_perm));
		identity->mi_nperms = 0;
	}
}

static inline char * task_state(struct task_struct *p, char *buffer)
{
	struct group_info *group_info;
	int g;
	struct fdtable *fdt = NULL;

	read_lock(&tasklist_lock);
	buffer += sprintf(buffer,
		"State:\t%s\n"
		"SleepAVG:\t%lu%%\n"
		"Tgid:\t%d\n"
		"Pid:\t%d\n"
		"PPid:\t%d\n"
		"TracerPid:\t%d\n"
		"Uid:\t%d\t%d\t%d\t%d\n"
		"Gid:\t%d\t%d\t%d\t%d\n",
		get_task_state(p),
		(p->sleep_avg/1024)*100/(1020000000/1024),
	       	p->tgid,
		p->pid, pid_alive(p) ? p->group_leader->real_parent->tgid : 0,
		pid_alive(p) && p->ptrace ? p->parent->pid : 0,
		p->uid, p->euid, p->suid, p->fsuid,
		p->gid, p->egid, p->sgid, p->fsgid);
	read_unlock(&tasklist_lock);
	task_lock(p);
	rcu_read_lock();
	if (p->files)
		fdt = files_fdtable(p->files);
	buffer += sprintf(buffer,
		"FDSize:\t%d\n"
		"Groups:\t",
		fdt ? fdt->max_fds : 0);
	rcu_read_unlock();

	group_info = p->group_info;
	get_group_info(group_info);
	task_unlock(p);

	for (g = 0; g < min(group_info->ngroups,NGROUPS_SMALL); g++)
		buffer += sprintf(buffer, "%d ", GROUP_AT(group_info,g));
	put_group_info(group_info);

	buffer += sprintf(buffer, "\n");
	return buffer;
}

static inline void task_state(struct seq_file *m, struct pid *pid,
				struct task_struct *p)
{
	struct group_info *group_info;
	int g;
	struct fdtable *fdt = NULL;

	rcu_read_lock();
	seq_printf(m,
		"State:\t%s\n"
		"SleepAVG:\t%lu%%\n"
		"Tgid:\t%d\n"
		"Pid:\t%d\n"
		"PPid:\t%d\n"
		"TracerPid:\t%d\n"
		"Uid:\t%d\t%d\t%d\t%d\n"
		"Gid:\t%d\t%d\t%d\t%d\n",
		get_task_state(p),
		(p->sleep_avg/1024)*100/(1020000000/1024),
	       	p->tgid, p->pid,
	       	pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
		pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
		p->uid, p->euid, p->suid, p->fsuid,
		p->gid, p->egid, p->sgid, p->fsgid);

	task_lock(p);
	if (p->files)
		fdt = files_fdtable(p->files);
	seq_printf(m,
		"FDSize:\t%d\n"
		"Groups:\t",
		fdt ? fdt->max_fds : 0);
	rcu_read_unlock();

	group_info = p->group_info;
	get_group_info(group_info);
	task_unlock(p);

	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
		seq_printf(m, "%d ", GROUP_AT(group_info, g));
	put_group_info(group_info);

	seq_printf(m, "\n");
}