Re: vfsmount

Manish Katiyar
2008-09-25T06:43:28Z

On Mon, Sep 22, 2008 at 10:27 PM, Rohit Sharma <imreckless@gmail.com> wrote:
> I am interested in getting the vfsmount structure of the mounted file
> system from my module.
> I used filp = get_empty_filp() (filp is file pointer)
> function to create an empty file object (as this contains pointer to
> vfsmount structure)
> file object has a field f_vfsmnt which points to the vfsmount structure
> i am storing this in my own my_vfsmnt structure of type vfsmount.
> my_vfsmnt = filp->f_vfsmnt
> but i am getting my_vfsmnt as NULL ??
>
> is there any other way of getting the vfsmount structure ??

Will this help ??

[root@localhost test]# insmod katiyar.ko
err=0, Path = /
[root@localhost test]# cat nngfs.c
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/namei.h>

#define MOD_AUTHOR "Manish Katiyar"
#define MODULE_DESC "A Simple test module "

static int nngfs_fs_init(void){
int err;
struct vfsmount *tmp;
struct nameidata nd;
err = path_lookup(".",LOOKUP_FOLLOW | LOOKUP_DIRECTORY,&nd);
tmp = nd.path.mnt;
printk(KERN_CRIT "err=%d, Path = %s\n",err,tmp->mnt_root->d_name.name);
return err;
}

static void nngfs_fs_exit(void){
printk(KERN_INFO "Unregistering \n");
return ;
}

module_init(nngfs_fs_init);
module_exit(nngfs_fs_exit);

MODULE_AUTHOR(MOD_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(MODULE_DESC);

Thanks -
Manish

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