linux-ext4 - Re: vfsmount

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Message-ID: <a199dae30809250453k507c78b5v21614fa84e1854b9@mail.gmail.com>
Date:	Thu, 25 Sep 2008 17:23:19 +0530
From:	"Srikanth Srinivasan" <ssrikanthiyer@...il.com>
To:	mkatiyar@...il.com, imreckless@...il.com
Cc:	kernelnewbies@...linux.org, linux-ext4@...r.kernel.org
Subject: Re: vfsmount

On Thu, Sep 25, 2008 at 12:13 PM, Manish Katiyar <mkatiyar@...il.com> wrote:
>
> 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
>
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >


>From kernel version 2.6.25 on you could directly use the
"current->fs->altroot.mnt" to retrieve the vfsmount structure.


Thanks -
Srikanth
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