linux-ext4 - Re: vfsmount

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Message-ID: <ea11fea30809242343g463c6cebv868d7b0affe7e0cb@mail.gmail.com>
Date:	Thu, 25 Sep 2008 12:13:24 +0530
From:	"Manish Katiyar" <mkatiyar@...il.com>
To:	"Rohit Sharma" <imreckless@...il.com>
Cc:	Kernelnewbies <kernelnewbies@...linux.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: vfsmount

On Mon, Sep 22, 2008 at 10:27 PM, Rohit Sharma <imreckless@...il.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@...alhost test]# insmod katiyar.ko
err=0, Path = /
[root@...alhost 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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