ResourceContainer/ioctl.c at master · madhumach/ResourceContainer · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
#include "processor_container.h"

#include <asm/uaccess.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/kthread.h>

// Project 1: Shikhar Sharma,ssharm29; Madhu Machavarapu, mmachav;

struct thread_object{
    struct task_struct* tsk;
    struct thread_object* t_next;
};

 struct container_object{
    long long unsigned int cid;
    struct container_object* c_next;
    struct thread_object* t_head;
};

typedef struct container_object c_node;
typedef struct thread_object t_node;

c_node* c_head=NULL;
extern struct mutex lock;

int processor_container_delete(struct processor_container_cmd __user *user_cmd)
{
    mutex_lock(&lock);
    struct processor_container_cmd temp;
    copy_from_user(&temp,user_cmd,sizeof(struct processor_container_cmd));
    c_node* c_now=c_head;
    c_node *c_prev=NULL;
    while(c_now!=NULL){
        if(c_now->cid==temp.cid){
            t_node *t_rem=c_now->t_head;
            c_now->t_head=t_rem->t_next;
            kfree(t_rem);
            if(c_now->t_head!=NULL)
            {
                wake_up_process(c_now->t_head->tsk);
                mutex_unlock(&lock);
                return 0;
            }
            else if(c_prev!=NULL)
            {
                c_prev->c_next=c_now->c_next;
                kfree(c_now);
            }
            else
            {
                c_head=c_now->c_next;
                kfree(c_now);
            }
        }
        c_prev=c_now;
        c_now=c_now->c_next;
    }
    mutex_unlock(&lock);
    return 0;
}

int processor_container_create(struct processor_container_cmd __user *user_cmd)
{
    mutex_lock(&lock);
    struct processor_container_cmd temp;
    copy_from_user(&temp,user_cmd,sizeof(struct processor_container_cmd));
    if(c_head==NULL){
        c_node* new_head=(c_node *)kmalloc(sizeof(c_node),GFP_KERNEL);
        new_head->cid=temp.cid;
        new_head->c_next=NULL;
        t_node* t_new=(t_node*)kmalloc(sizeof(t_node),GFP_KERNEL);
        t_new->tsk=current;
        t_new->t_next=NULL;
        new_head->t_head=t_new;
        c_head=new_head;
    }
    else{
        c_node *c_now=c_head;

            while(c_now!=NULL){
            if(c_now->cid==temp.cid){
                t_node *t_now=c_now->t_head;
                while(t_now->t_next!=NULL)
                        t_now=t_now->t_next;
                t_node* t_new=(t_node*)kmalloc(sizeof(t_node),GFP_KERNEL);
                t_new->tsk=current;
                t_new->t_next=NULL;
                t_now->t_next=t_new;
                set_current_state(TASK_INTERRUPTIBLE);
                mutex_unlock(&lock);
                schedule();
                return 0;
            }
            c_now = c_now->c_next;
        }
        c_now=c_head;
        while(c_now->c_next!=NULL){
            c_now=c_now->c_next;
        }
        c_node* c_new = (c_node*) kmalloc(sizeof(c_node),GFP_KERNEL);
        t_node* t_new=(t_node*)kmalloc(sizeof(t_node),GFP_KERNEL);
        t_new->tsk=current;
        t_new->t_next=NULL;
        c_new->t_head=t_new;
        c_now->c_next=c_new;
        c_new->c_next=NULL;
        c_new->cid=temp.cid;
    }
     mutex_unlock(&lock);
    return 0;
}

int processor_container_switch(struct processor_container_cmd __user *user_cmd)
{

    mutex_lock(&lock);
    c_node* fakeHead=c_head;
    while(fakeHead!=NULL){
        if(fakeHead->t_head->tsk==current){
            if(fakeHead->t_head->t_next==NULL)
                goto down;
            t_node* to_be_slept=fakeHead->t_head;
            t_node* to_be_woken_up=fakeHead->t_head->t_next;
            fakeHead->t_head=to_be_woken_up;
            t_node* tmp=to_be_woken_up;
            while(tmp->t_next!=NULL)
                tmp=tmp->t_next;
            tmp->t_next=to_be_slept;
            to_be_slept->t_next=NULL;
            set_current_state(TASK_INTERRUPTIBLE);
            wake_up_process(to_be_woken_up->tsk);
            mutex_unlock(&lock);
            schedule();
            break;
        }
        fakeHead=fakeHead->c_next;
    }
        down:mutex_unlock(&lock);
        return 0;
}

int processor_container_ioctl(struct file *filp, unsigned int cmd,
                              unsigned long arg)
{
    switch (cmd)
    {
    case PCONTAINER_IOCTL_CSWITCH:
        return processor_container_switch((void __user *)arg);
    case PCONTAINER_IOCTL_CREATE:
        return processor_container_create((void __user *)arg);
    case PCONTAINER_IOCTL_DELETE:
        return processor_container_delete((void __user *)arg);
    default:
        return -ENOTTY;
    }
}