Re: [PATCH v2] vfs: Don't exchange "short" filenames unconditionally.

From: Linus Torvalds
Date: Mon Sep 29 2014 - 13:55:09 EST

On Mon, Sep 29, 2014 at 9:27 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> What we get in free_dentry() is:
> * external name not shared: refcount driven to 0, RCU-delayed
> call of "free dentry, free ext name"
> * external name still shared: refcount positive after decrement,
> no freeing ext name
> * no external name: no ext name to free
> In the last two cases we do what dentry_free() used to do, except that now
> __d_free() doesn't even look for ext name. Just frees the dentry. If
> it never had been hashed - directly called, otherwise - via call_rcu().
> Does that look OK for you?

Yes. That looks fairly straightforward.

Although please rename that "ext" in ext_name/__d_free_ext() to
something else. "ext" to me says not "external", but "extended". I
think we can just write out "external", like we already do in

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