/home/osboxes/Documenti/AOSV/aosv1819-federicoalfano/session_module.h

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#ifndef SESSION_HEADER
#define SESSION_HEADER

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/fs_struct.h>
#include <linux/fdtable.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/uaccess.h>
#include <linux/kobject.h> 
#include <linux/sysfs.h>
#include <linux/rbtree.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/dcache.h>
#include <linux/sched/signal.h>
#include <linux/file.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/uaccess.h>

#define DEVICE_NAME "session-module"

#define SESSION_INSTANCES 1

#define SESSION_MAJOR_NUMBER 0  
#define SESSION_BASE_MINOR 0            
#define SESSION_CLASS "session-class"

#define SESSION_MAGIC 'S'
#define SESSION_OPEN_SEQ_NO 0X1
#define SESSION_CLOSE_SEQ_NO 0X2

#define MAX_FILENAME_SIZE 128           
#define MAX_PATH_SIZE 256                   
#define MAX_FILE_NUM 256                        
#define FILE_SESSIONS_SIZE (MAX_PATH_SIZE*MAX_FILE_NUM)
#define N_SESS_DIGITS 8                         
#define N_PROC_DIGITS 6                         
#define PROC_NAME_LENGTH 8  


#define SESSION_OPEN _IOW(SESSION_MAGIC, SESSION_OPEN_SEQ_NO, unsigned int)
#define SESSION_CLOSE _IOW(SESSION_MAGIC, SESSION_CLOSE_SEQ_NO,  unsigned int)


struct session_cdev {
    struct cdev cdev;
    struct kobject *kobj;

    };

struct session_file_node
{
    char key[MAX_PATH_SIZE];         
    struct rb_node node;                    
    struct rw_semaphore *rw_sem;    
    atomic_t counter;                           
};

struct session_proc_node
{
    int key;                                 
    struct rb_node node;
    atomic_t session_counter;   
};
struct session_priv_data
{
    struct rw_semaphore *rw_sem;    
    struct file *session_filp;                  
    char *abs_path;                             
};


int module_open(struct inode *, struct file *);
int module_release(struct inode *, struct file *);
long module_ioctl(struct file *, unsigned int, unsigned long );

int session_release(struct inode *, struct file *);

ssize_t session_read(struct file *, char __user *, size_t ,loff_t *);

loff_t session_llseek(struct file *, loff_t, int);

ssize_t session_write(struct file *, const char __user *, size_t, loff_t *);

int clear_proc_node(void);

void clear_sysfs_file(struct file *);

void traverse(struct rb_node*, char*);
void traverse_proc(struct rb_node *, char *);

void read_file(struct file *);
int rb_insert(struct rb_root *, struct session_proc_node *,  rwlock_t *);
int rb_insert_file(struct rb_root *, struct session_file_node *,  rwlock_t *);
struct session_proc_node *rb_search(struct rb_root *, int,  rwlock_t *);
struct session_file_node *rb_search_file(struct rb_root *, char*,  rwlock_t *);
int session_exit(struct session_proc_node *);
int setup_sys_tree(void);
int flush(struct inode *, struct file *);
ssize_t file_counter_show(struct kobject *, struct kobj_attribute *, char *);
ssize_t proc_counter_show(struct kobject *, struct kobj_attribute *, char *);
ssize_t path_show(struct kobject *, struct kobj_attribute *, char *);
ssize_t path_store(struct kobject *, struct kobj_attribute *, const char *, size_t );
ssize_t session_counter_show(struct kobject *, struct kobj_attribute *, char *);


#endif