root and rootmnt.

["Ray S." <ef057@hotmail.com>]

Can anyone help me understand what is the difference between 
current->fs->root and current->fs->rootmnt?

I'm trying to understand the follow_dotdot function in fs/namei.c.
Why both fs>root and fs->rootmnt are checked (to see if we are trying to 
escape from chroot jail)?

if (nd->dentry == current->fs->root &&
   nd->mnt == current->fs->rootmnt)  {
      read_unlock(&current->fs->lock);
      break;
   }

I would be grateful if anyone could help.




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