linux-kernel - Re: [PATCH 01/10] VFS: support parallel updates in the one directory.

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Message-ID: <YxKaaN9cHD5yzlTr@ZenIV>
Date:   Sat, 3 Sep 2022 01:06:00 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     NeilBrown <neilb@...e.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Daire Byrne <daire@...g.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/10] VFS: support parallel updates in the one directory.

On Mon, Aug 29, 2022 at 11:59:02AM +1000, NeilBrown wrote:

> > When would we get out of __lookup_hash() with in-lookup dentry?
> > Confused...
> 
> Whenever wq is passed in and ->lookup() decides, based on the flags, to do
> nothing.
> NFS does this for LOOKUP_CREATE|LOOKUP_EXCL and for LOOKUP_RENAME_TARGET

Frankly, I would rather do what all other callers of ->lookup() do and
just follow it with d_lookup_done(dentry), no matter what it returns.
It's cheap enough...