Read and write to files in the file system during Linux kernel driver loading

Utils.h file:

#ifndef __utils_h__ #define __utils_h__void a2f (Char *s); #endif

UTILS.C file:

#include <linux/fs.h>#include<asm/segment.h>#include<asm/uaccess.h>#include<linux/buffer_head.h>#include<linux/string.h>#include"Utils.h"#defineFile_path "/hzh"Static structFile *FP;Static intopen_it () {if(FP)return 0;    mm_segment_t Oldfs; intErr =0; Oldfs=Get_fs ();    Set_fs (Get_ds ()); FP= Filp_open (File_path, o_creat| o_rdwr| O_append,0);    Write to File Set_fs (OLDFS) in append mode; if(Is_err (FP)) {ERR=Ptr_err (FP); return 1; }    return 0;}Static voidclose_it () {if(!FP)return; Filp_close (FP,0); FP=0;}Static intRead_it (unsignedLong LongOffset, unsignedChar*data, unsignedintsize) {    if(!FP)return 0;    mm_segment_t Oldfs; intret; Oldfs=Get_fs ();    Set_fs (Get_ds ()); RET= Vfs_read (FP, data, size, &offset);    Set_fs (OLDFS); returnret;}Static intWrite_it (unsignedLong LongOffset, unsignedChar*data, unsignedintsize) {    if(!FP)return 0;    mm_segment_t Oldfs; intret; Oldfs=Get_fs ();    Set_fs (Get_ds ()); RET= Vfs_write (FP, data, size, &offset);    Set_fs (OLDFS); returnret;}Static intsync_it () {if(!FP)return 0; Vfs_fsync (FP,0); return 0;}voidA2F (Char*s) {if(Open_it ())return; intLen =strlen (s); Write_it (0, S, Len); Write_it (0,"\ r \ n",2);    Sync_it (); //close_it ();}

Read and write to files in the file system during Linux kernel driver loading