Hi,
> The [permanent] tag indicates that the module has no module_exit, and
> thus can't be unloaded.
Thanks for pointing out. i realized that i have used exit_module and
not cleanup_module. Changing to cleanup_module works as expected.
Regards,
Adil
On Wed, Oct 6, 2010 at 9:57 PM, Dave Hylands <dhylands@xxxxxxxxx> wrote:
> Hi Adil,
>
> On Wed, Oct 6, 2010 at 5:30 AM, Adil Mujeeb <mujeeb.adil@xxxxxxxxx> wrote:
>> Hi list,
>>
>> I am trying to create a dummy module for learning purpose. For “hello
>> world” example, everything goes fine. But when I tried to add
>> register_filesystem and unregister_filesystem call the behavior is
>> unexpected. I am not able to unload my module.
>>
>> My module has single file named rkfs_mod.c:
>>
>> [adil@tom kernel]$ cat rkfs_mod.c
>> #include <linux/module.h>
>> #include <linux/fs.h>
>>
>> static struct super_block *rkfs_get_sb(struct file_system_type *fs_type,
>> int flags, char *dev_name, void *raw_data)
>> {
>> printk("get_sb call\n");
>> return NULL;
>> }
>>
>> static void rkfs_kill_sb(struct super_block *s)
>> {
>> printk("kill sb \n");
>> return;
>> }
>>
>> static struct file_system_type rkfs = {
>> name: "rkfs_mod",
>> get_sb: rkfs_get_sb,
>> kill_sb: rkfs_kill_sb,
>> owner: THIS_MODULE
>> };
>>
>> int init_module(void) {
>> int err;
>> printk("Registering the filesystem\n");
>> err = register_filesystem( &rkfs );
>> return err;
>> }
>>
>> void exit_module(void){
>> printk("Unregisterign the filesystem\n");
>> unregister_filesystem(&rkfs);
>> }
>> [adil@tom kernel]$
>>
>> My Makefile contents:
>>
>> [adil@tom kernel]$ cat Makefile
>> obj-m += rkfs_mod.o
>> all:
>> make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
>> clean :
>> make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
>> [adil@tom kernel]$
>>
>> [adil@tom kernel]$ uname -a
>> Linux tom.HCLTECH 2.6.30 #1 SMP Thu Dec 17 16:45:24 IST 2009 i686 i686
>> i386 GNU/Linux
>> [adil@tom kernel]$
>>
>> Module loading is successful but unloading fails.
>>
>> [root@tom linux-2.6.30]# /sbin/lsmod | grep rkfs
>> rkfs_mod 1452 0 [permanent]
>
> The [permanent] tag indicates that the module has no module_exit, and
> thus can't be unloaded.
>
> --
> Dave Hylands
> Shuswap, BC, Canada
> http://www.DaveHylands.com/
>
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