Re: [PATCH 10/11] VFS: use d_alloc_parallel() in lookup_one_qstr_excl().

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Subject: Re: [PATCH 10/11] VFS: use d_alloc_parallel() in lookup_one_qstr_excl().
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Wed, 13 Aug 2025 06:19:57 +0100
Cc: Christian Brauner <brauner@xxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Marc Dionne <marc.dionne@xxxxxxxxxxxx>, Xiubo Li <xiubli@xxxxxxxxxx>, Ilya Dryomov <idryomov@xxxxxxxxx>, Tyler Hicks <code@xxxxxxxxxxx>, Miklos Szeredi <miklos@xxxxxxxxxx>, Richard Weinberger <richard@xxxxxx>, Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>, Johannes Berg <johannes@xxxxxxxxxxxxxxxx>, Trond Myklebust <trondmy@xxxxxxxxxx>, Anna Schumaker <anna@xxxxxxxxxx>, Chuck Lever <chuck.lever@xxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, Amir Goldstein <amir73il@xxxxxxxxx>, Steve French <sfrench@xxxxxxxxx>, Namjae Jeon <linkinjeon@xxxxxxxxxx>, Carlos Maiolino <cem@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-afs@xxxxxxxxxxxxxxxxxxx, netfs@xxxxxxxxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, ecryptfs@xxxxxxxxxxxxxxx, linux-um@xxxxxxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, linux-unionfs@xxxxxxxxxxxxxxx, linux-cifs@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20250812235228.3072318-11-neil@brown.name>
References: <20250812235228.3072318-1-neil@brown.name> <20250812235228.3072318-11-neil@brown.name>

On Tue, Aug 12, 2025 at 12:25:13PM +1000, NeilBrown wrote:

> + * If it is d_in_lookup() then these conditions can only be checked by the
> + * file system when carrying out the intent (create or rename).

I do not understand.  In which cases would that happen and what would happen
prior to that patch in the same cases?

Follow-Ups:
- Re: [PATCH 10/11] VFS: use d_alloc_parallel() in lookup_one_qstr_excl().
  - From: NeilBrown

References:
- [PATCH 00/11] VFS: prepare for changes to directory locking
  - From: NeilBrown
- [PATCH 10/11] VFS: use d_alloc_parallel() in lookup_one_qstr_excl().
  - From: NeilBrown

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