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	Tue, 03 Feb 2026 21:50:02 +0000
Date: Tue, 3 Feb 2026 21:50:02 +0000
From: Al Viro <viro@zeniv.linux.org.uk>
To: Waiman Long <llong@redhat.com>
Cc: Paul Moore <paul@paul-moore.com>, Eric Paris <eparis@redhat.com>,
	Christian Brauner <brauner@kernel.org>,
	linux-kernel@vger.kernel.org, audit@vger.kernel.org,
	Richard Guy Briggs <rgb@redhat.com>,
	Ricardo Robaina <rrobaina@redhat.com>
Subject: Re: [PATCH v2] audit: Avoid excessive dput/dget in audit_context
 setup and reset paths
Message-ID: <20260203215002.GI3183987@ZenIV>
References: <20260203194433.1738162-1-longman@redhat.com>
 <20260203200505.GH3183987@ZenIV>
 <590a36e6-8d11-411a-8fcd-d93eef96f0e9@redhat.com>
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On Tue, Feb 03, 2026 at 03:32:04PM -0500, Waiman Long wrote:

> That is actually a concern that I have at the back of my mind. I can modify
> the patch to cache only the dentry and do get/put the mount every time which
> is much cheaper as it is a percpu counter.  In that way, a chdir(2) followed
> by a umount(2) shouldn't cause a -EBUSY. Right?

Quite - it will just retain a reference to dentry, with filesystem shutdown
being very unhappy about somebody retaining references to objects on the
filesystem about to be taken out...