How to get device name with device id?

[liuyue]

ashish mahamuni,

I guess maybe the following function does what you want.
But it is a kernel function, sorry :(

int __file_to_disk (char * file_name,  char *disk_name) {
        int err = 0;
        struct nameidata        nd;
        struct super_block      * sb;
        struct vfsmount *mnt;
        err = path_lookup(file_name, LOOKUP_FOLLOW, &nd);
        if(err){
                DCFS3_ERROR("error to parse the file name, %s\n", file_name);
                goto exit;
        }
        mnt = nd.mnt;
        sb = mnt->mnt_sb;
        strcpy (disk_name, sb->s_bdev->bd_disk->disk_name);
        path_release(&nd);
exit:
        return err;
}

======= 2008-03-20 19:21:04 您在来信中写道：=======

>Hi all,
>
>I want to open a device(/dev/sda1, /dev/hda2 etc) in which my file exists.
>I've used 'stat' system call to get the device id.
>
>But now I want the device name from this id(st_dev).
>How to get that one?
>Or 
>Do you have any other method to know the device name where my file resides?
>
>Thanks 
>
>
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　　　　　　　　liuyue
　　　　　　　　liuyue at ncic.ac.cn
　　　　　　　　　　2008-03-20