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[size=medium]struct group_info init_groups = { .usage = ATOMIC_INIT(2) };[/size]

[size=medium]struct group_info *groups_alloc(int gidsetsize){[/size]

[size=medium]    struct group_info *group_info;[/size]

[size=medium]    int nblocks;[/size]

[size=medium]    int i;[/size]

[size=medium]    nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;[/size]

[size=medium]    /* Make sure we always allocate at least one indirect block pointer */[/size]

[size=medium]    nblocks = nblocks ? : 1;[/size]

[size=medium]    group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);[/size]

[size=medium]    if (!group_info)[/size]

[size=medium]        return NULL;[/size]

[size=medium]    group_info->ngroups = gidsetsize;[/size]

[size=medium]    group_info->nblocks = nblocks;[/size]

[size=medium]    atomic_set(&group_info->usage, 1);[/size]

[size=medium]    if (gidsetsize blocks[0] = group_info->small_block;[/size]

[size=medium]    else {[/size]

[size=medium]        for (i = 0; i blocks = b;[/size]

[size=medium]        }[/size]

[size=medium]    }[/size]

[size=medium]    return group_info;[/size]

[size=medium]out_undo_partial_alloc:[/size]

[size=medium]    while (–i >= 0) {[/size]

[size=medium]        free_page((unsigned long)group_info->blocks);[/size]

[size=medium]    }[/size]

[size=medium]    kfree(group_info);[/size]

[size=medium]    return NULL;[/size]

[size=medium]}[/size]

[size=medium]EXPORT_SYMBOL(groups_alloc);[/size]

[size=medium]void groups_free(struct group_info *group_info)[/size]

[size=medium]{[/size]

[size=medium]    if (group_info->blocks[0] != group_info->small_block) {[/size]

[size=medium]        int i;[/size]

[size=medium]        for (i = 0; i nblocks; i++)[/size]

[size=medium]            free_page((unsigned long)group_info->blocks);[/size]

[size=medium]    }[/size]

[size=medium]    kfree(group_info);[/size]

[size=medium]}[/size]

[size=medium]EXPORT_SYMBOL(groups_free);[/size]

[size=medium]/* export the group_info to a user-space array */[/size]

[size=medium]static int groups_to_user(gid_t __user *grouplist,[/size]

[size=medium]              const struct group_info *group_info)[/size]

[size=medium]{[/size]

[size=medium]    int i;[/size]

[size=medium]    unsigned int count = group_info->ngroups;[/size]

[size=medium]    for (i = 0; i nblocks; i++) {[/size]

[size=medium]        unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);[/size]

[size=medium]        unsigned int len = cp_count * sizeof(*grouplist);[/size]

[size=medium]        if (copy_to_user(grouplist, group_info->blocks, len))[/size]

[size=medium]            return -EFAULT;[/size]

[size=medium]        grouplist += NGROUPS_PER_BLOCK;[/size]

[size=medium]        count -= cp_count;[/size]

[size=medium]    }[/size]

[size=medium]    return 0;[/size]

[size=medium]}[/size]

[size=medium]/* fill a group_info from a user-space array - it must be allocated already */[/size]

[size=medium]static int groups_from_user(struct group_info *group_info,[/size]

[size=medium]    gid_t __user *grouplist)[/size]

[size=medium]{[/size]

[size=medium]    int i;[/size]

[size=medium]    unsigned int count = group_info->ngroups;[/size]

[size=medium]    for (i = 0; i nblocks; i++) {[/size]

[size=medium]        unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);[/size]

[size=medium]        unsigned int len = cp_count * sizeof(*grouplist);[/size]

[size=medium]        if (copy_from_user(group_info->blocks, grouplist, len))[/size]

[size=medium]            return -EFAULT;[/size]

[size=medium]        grouplist += NGROUPS_PER_BLOCK;[/size]

[size=medium]        count -= cp_count;[/size]

[size=medium]    }[/size]

[size=medium]    return 0;[/size]

[size=medium]}[/size]

[size=medium]/* a simple Shell sort */[/size]

[size=medium]static void groups_sort(struct group_info *group_info)[/size]

[size=medium]{[/size]

[size=medium]    int base, max, stride;[/size]

[size=medium]    in[/size]

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