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#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/namei.h>
#include <asm/segment.h>
#include <linux/uaccess.h>
struct file* file_open(const char* path, int flags, int rights) {
struct file* filp = NULL;
mm_segment_t oldfs;
int err = 0;
oldfs = get_fs();
set_fs(get_ds());
filp = filp_open(path, flags, rights);
set_fs(oldfs);
if(IS_ERR(filp)) {
err = PTR_ERR(filp);
return NULL;
}
return filp;
}
void file_close(struct file* file) {
filp_close(file, NULL);
}
int file_read(struct file* file, unsigned char* data, unsigned int size) {
mm_segment_t oldfs;
int ret;
oldfs = get_fs();
set_fs(get_ds());
ret = vfs_read(file, data, size, &file->f_pos);
set_fs(oldfs);
return ret;
}
int file_write(struct file* file, unsigned char* data, unsigned int size) {
mm_segment_t oldfs;
int ret;
oldfs = get_fs();
set_fs(get_ds());
ret = vfs_write(file, data, size, &file->f_pos);
set_fs(oldfs);
return ret;
}
int remove_file(char *path)
{
mm_segment_t oldfs;
int ret;
struct path ndpath;
struct dentry *dentry;
oldfs = get_fs();
set_fs(get_ds());
//ret = kern_path_parent(path, &nd);
ret = kern_path(path,LOOKUP_PARENT,&ndpath);
if (ret != 0) {
return -ENOENT;
}
dentry = lookup_one_len(path, ndpath.dentry, strlen(path));
if (IS_ERR(dentry)) {
return -EACCES;
}
vfs_unlink(ndpath.dentry->d_inode, dentry);
dput(dentry);
set_fs(oldfs);
return ret;
}
int save_data_to_file(char *path, char *data, int size)
{
struct file *fp = NULL;
fp = file_open(path, O_WRONLY | O_CREAT, 0);
if (fp != NULL) {
file_write(fp, data, size);
file_close(fp);
return 0;
}
return -1;
}
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