On Sun, Sep 08, 2013 at 12:15:46PM +0800, Ian Kent wrote:
> > and *name is never modified in it. Why not simply pass it by value?
> > Moreover, I'm not sure I understand what do we need sbi->fs_lock in
> > there. Other than that, it's very close to dentry_path() (well, that
> > and different calling conventions). Ian?
>
> Yes, it is close to dentry_path() but the path functions used to return
> the full path to the root, although I don't see where dentry_path() get
> the root, mmm ...
dentry_path(), unlike d_path(), is relative to the root of filesystem
containing dentry in question. There are 3 of those suckers:
d_path(): vfsmount/dentry => path to current process' root
d_absolute_path(): ditto, but ignores chroot jails (goes to
the absolute root of namespace)
dentry_path(): dentry => path from root of fs containing that
dentry.
IOW, if you have something mounted on /jail/mnt/foo and are chrooted into
/jail, passing vfsmount/dentry of /jail/mnt/foo/bar/baz to d_path() will
yield "/mnt/foo/bar/baz", to d_absolute_path() - "/jail/mnt/foo/bar/baz" and
passing the same dentry to dentry_path() - "/bar/baz".
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