Kernel OOPS[filesystem programming]

From: Jeba Anandhan A (jeba_career_at_yahoo.com)
Date: 08/31/04

  • Next message: Sid Boyce: "2.6.9-rc1-mm2 nvidia breakage" 
    Date:	Tue, 31 Aug 2004 09:19:56 -0700 (PDT)
To: linux-kernel@vger.kernel.org

    i have written kernel program to access the data
    structure of particular inode.

    #include<linux/kernel.h>
    #include<linux/module.h>
    #include<linux/fs.h>
                                                          
                                                          
                  
                                                          
                                                          
                  
    static struct inode *my_inode;
    static unsigned long inode_no;
    int init_module(void){
    printk("inode module inserted\n");
    inode_no=1304012;
    printk("inode no=%d",inode_no);
    my_inode->i_ino=inode_no; // it creates segmentation
    //fault why so..
    return 0;
    }
                                                          
                                                          
                  
    void cleanup_module(void){
    }
                                                          
                                                          
                  
    when i insert the module ,kernel got OOPS.
    ~
    <1>Unable to handle kernel NULL pointer dereference at
    virtual address 00000028
     printing eip:
    d09c80a1
    *pde = 0841b067
    *pte = 00000000
    Oops: 0002
    inodetraversal1 inodetraversal i810_audio ac97_codec
    soundcore parport_pc lp parport autofs 3c59x floppy sg
    microcode ide-scsi scsi_mod ide-cd cdrom keybdev h
    CPU: 0
    EIP: 0060:[<d09c80a1>] Tainted: P
    EFLAGS: 00210282
     
    EIP is at init_module [inodetraversal1] 0x41
    (2.4.22-1.2115.nptl)
    eax: 00000000 ebx: c0349124 ecx: 00000001 edx:
    0013e5cc
    esi: 00000000 edi: 00000000 ebp: c4123f10 esp:
    c4123f08
    ds: 0068 es: 0068 ss: 0068
    Process insmod (pid: 7866, stackpage=c4123000)
    Stack: c0349124 00000000 d09c8000 c011ed74 c03badb4
    00000001 d09c8000 00000000
           08ea51c3 d09c8060 00000003 000000d3 00000060
    0000000f c89855c0 ccd26000
           cbbb4000 d09ca000 00000060 d09ad000 d09c8060
    0000037c 00000000 00000000
    Call Trace: [<c011ed74>] sys_init_module [kernel]
    0x584 (0xc4123f14)
    [<d09c8060>] init_module [inodetraversal1] 0x0
    (0xc4123f2c)
    [<d09c8060>] init_module [inodetraversal1] 0x0
    (0xc4123f58)
    [<c0109b9f>] system_call [kernel] 0x33 (0xc4123fc0)
     
     
    Code: 89 50 28 b8 00 00 00 00 c9 c3 55 89 e5 c9 c3 69
    6e 6f 64 65
      
    whatz problem with my program.how to rectify.?
    jeba

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