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

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Message-ID: <CA+55aFxeD-m0ddKrYr9-A804rqvdvPB-aczV=HV=5hqpK7-XyQ@mail.gmail.com>
Date:	Mon, 29 Sep 2014 10:54:59 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mikhail Efremov <sem@...linux.org>
Subject: Re: [PATCH v2] vfs: Don't exchange "short" filenames unconditionally.

On Mon, Sep 29, 2014 at 9:27 AM, Al Viro <viro@...iv.linux.org.uk> 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
"dname_external()".

                   Linus
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