linux-kernel - Re: [PATCH 9/9] nfs: don't open in ->d

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Date:	Tue, 06 Mar 2012 18:10:57 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	"Myklebust\, Trond" <Trond.Myklebust@...app.com>
Cc:	"viro\@ZenIV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"linux-fsdevel\@vger.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch\@infradead.org" <hch@...radead.org>
Subject: Re: [PATCH 9/9] nfs: don't open in ->d_revalidate

"Myklebust, Trond" <Trond.Myklebust@...app.com> writes:

> It makes a big difference to the cache miss case, since not only is the
> entire path looked up again, but the LOOKUP_REVAL flag gets set, which
> forces a full lookup of each component (as opposed to just
> revalidating).

This is not about a cache miss.  It's about a cache hit (positive cached
dentry) but changed inode on the server.

Is this a likely scenario?

Thanks,
Miklos
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