Re: [PATCH RFC 1/3] fs: introduce helper d_path_fast()

[Al Viro]

On Sat, May 08, 2021 at 03:17:44PM -0700, Linus Torvalds wrote:
> On Sat, May 8, 2021 at 2:06 PM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> >
> > On Sat, May 08, 2021 at 01:39:45PM -0700, Linus Torvalds wrote:
> >
> > > +static inline int prepend_entries(struct prepend_buffer *b, const struct path *path, const struct path *root, struct mount *mnt)
> >
> > If anything, s/path/dentry/, since vfsmnt here will be equal to &mnt->mnt all along.
> 
> Too subtle for me.
> 
> And is it? Because mnt is from
> 
>      mnt = real_mount(path->mnt);
> 
> earlier, while vfsmount is plain "path->mnt".

static inline struct mount *real_mount(struct vfsmount *mnt)
{
        return container_of(mnt, struct mount, mnt);
}