linux-kernel - Re: [PATCH 03/11] VFS: add dentry_lookup

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Message-ID: <20250813041506.GZ222315@ZenIV>
Date: Wed, 13 Aug 2025 05:15:06 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: NeilBrown <neil@...wn.name>
Cc: Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	David Howells <dhowells@...hat.com>,
	Marc Dionne <marc.dionne@...istor.com>,
	Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
	Tyler Hicks <code@...icks.com>, Miklos Szeredi <miklos@...redi.hu>,
	Richard Weinberger <richard@....at>,
	Anton Ivanov <anton.ivanov@...bridgegreys.com>,
	Johannes Berg <johannes@...solutions.net>,
	Trond Myklebust <trondmy@...nel.org>,
	Anna Schumaker <anna@...nel.org>,
	Chuck Lever <chuck.lever@...cle.com>,
	Jeff Layton <jlayton@...nel.org>,
	Amir Goldstein <amir73il@...il.com>,
	Steve French <sfrench@...ba.org>,
	Namjae Jeon <linkinjeon@...nel.org>,
	Carlos Maiolino <cem@...nel.org>, linux-fsdevel@...r.kernel.org,
	linux-afs@...ts.infradead.org, netfs@...ts.linux.dev,
	ceph-devel@...r.kernel.org, ecryptfs@...r.kernel.org,
	linux-um@...ts.infradead.org, linux-nfs@...r.kernel.org,
	linux-unionfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] VFS: add dentry_lookup_killable()

On Tue, Aug 12, 2025 at 12:25:06PM +1000, NeilBrown wrote:
> btrfs/ioctl.c uses a "killable" lock on the directory when creating an
> destroying subvols.  overlayfs also does this.
> 
> This patch adds dentry_lookup_killable() for these users.
> 
> Possibly all dentry_lookup should be killable as there is no down-side,
> but that can come in a later patch.

Same objections re lookup_flags and it would be better to do that
at the same point where you convert the (btrfs and overlayfs?) callers.