From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B578A439000; Wed, 10 Jun 2026 15:52:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781106722; cv=none; b=jhmeaTRYywKM8ICIoSzN6ujfZKouVdf/SZgqZSqfq9svAe+RwRQWPzvaR6LnaLyskt7K8HSMt1OCITVCHfHQ0criUZPEY4jlyZ5BgxBQRDHMv2q5AtNcf6wFz68ru/O0I6EycA8q6IpgPj69M3JSReM59zl4HjTXPBsL+XZYdH8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781106722; c=relaxed/simple; bh=+xvIo1+BjAuiU8ReQhKX6UYs9PKxC1+6lv3XvYAV1Gk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=qeHYDK36VWr6RUNbv522ermNVVKoDksfqbD0eqwuONO+ULGZqK0eygAG5NS5MExJFybI6g46v1zny2KeZPgeVkeGsRELtnFvzZf9bfJ72NvkXl0K+Pg9OzBJA0PjU3mIVPHJZx/H2plim3ZrYGdORNWhjEXGkecTUBgOgTy1ZQ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A/4oydsC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="A/4oydsC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2FE11F00893; Wed, 10 Jun 2026 15:51:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781106721; bh=CwNCLUffOLZ9FQ4DKwTWAbzR18kc3c+ttNJlSBuO3Co=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=A/4oydsCChnzYmYuHr76D/OAxwN2sUC4dpf5I/PWjp/oWeLc7tLeY8ejF2qxNx4fy bwNCYRS/GB3C8X2+qHQoxtMYyjXN3yILb/DPQVqJQTei63HicfDACFhLPwYmcS6+V+ eBf30DxET1SK7BhqVo/NUJWtmuUYwlkZhq+JgsuxM9+1MInQ1UnKlH6hansat0uagv hQ7ZQehD3G+xsJVIGaHLP1BnAaPptCT5pV8/JWlPCkInQBmjAkCf6sfuWlr5DsLKmv rrEFxeNksvSNtiUaUhUZhyog1B/bhTp8tsXMoOFx3EEyLVZoBbDOTsKskylUpNwX9i /fPBK5XIfZ5ww== Message-ID: Subject: Re: [PATCH v5 09/21] nfsd: add data structures for handling CB_NOTIFY From: Jeff Layton To: Chuck Lever , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker , Jonathan Corbet , Shuah Khan Cc: Steven Rostedt , Alexander Aring , Amir Goldstein , Jan Kara , Alexander Viro , Christian Brauner , Calum Mackay , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-nfs@vger.kernel.org Date: Wed, 10 Jun 2026 11:51:57 -0400 In-Reply-To: <566fd48c-bf10-4974-9ee4-1afc30b7a69c@app.fastmail.com> References: <20260522-dir-deleg-v5-0-542cddfad576@kernel.org> <20260522-dir-deleg-v5-9-542cddfad576@kernel.org> <566fd48c-bf10-4974-9ee4-1afc30b7a69c@app.fastmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-1.fc44) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-06-08 at 16:18 -0400, Chuck Lever wrote: >=20 > On Fri, May 22, 2026, at 3:42 PM, Jeff Layton wrote: > > Add the data structures, allocation helpers, and callback operations > > needed for directory delegation CB_NOTIFY support: >=20 > > diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h > > index 9c6e2e7abc82..505fabf8f1bf 100644 > > --- a/fs/nfsd/state.h > > +++ b/fs/nfsd/state.h > > @@ -197,6 +197,44 @@ struct nfs4_cb_fattr { > > #define NOTIFY4_EVENT_QUEUE_SIZE 3 > > #define NOTIFY4_PAGE_ARRAY_SIZE 1 > >=20 > > +struct nfsd_notify_event { > > + refcount_t ne_ref; // refcount > > + u32 ne_mask; // FS_* mask from fsnotify callback > > + struct dentry *ne_dentry; // dentry reference to target > > + u32 ne_namelen; // length of ne_name > > + char ne_name[]; // name of dentry being changed >=20 > Nit: checkpatch doesn't like the C++ comment style. >=20 >=20 > > +}; > > + > > +static inline struct nfsd_notify_event *nfsd_notify_event_get(struct= =20 > > nfsd_notify_event *ne) > > +{ > > + refcount_inc(&ne->ne_ref); > > + return ne; > > +} > > + > > +static inline void nfsd_notify_event_put(struct nfsd_notify_event *ne) > > +{ > > + if (refcount_dec_and_test(&ne->ne_ref)) { > > + dput(ne->ne_dentry); > > + kfree(ne); > > + } > > +} > > + > > +/* > > + * Represents a directory delegation. The callback is for handling=20 > > CB_NOTIFYs. > > + * As notifications from fsnotify come in, allocate a new event, take= =20 > > the ncn_lock, > > + * and add it to the ncn_evt queue. The CB_NOTIFY prepare handler will= =20 > > take the > > + * lock, clean out the list and process it. > > + */ > > +struct nfsd4_cb_notify { > > + spinlock_t ncn_lock; // protects the evt queue and count > > + int ncn_evt_cnt; // count of events in ncn_evt > > + int ncn_nf_cnt; // count of valid entries in ncn_nf > > + struct nfsd_notify_event *ncn_evt[NOTIFY4_EVENT_QUEUE_SIZE]; // list= =20 > > of events > > + struct page *ncn_pages[NOTIFY4_PAGE_ARRAY_SIZE]; // for encoding > > + struct notify4 *ncn_nf; // array of notify4's to be sent > > + struct nfsd4_callback ncn_cb; // notify4 callback > > +}; >=20 > Ditto. >=20 I'll note that the code is littered with this comment style anyway, including a bunch of the new // SPDX- header comments. Personally, I find this more readable for documenting struct fields. AFAICT, the checkpatch rule was manufactured out of thin air. Documentation/dev-tools/checkpatch.rst says: **C99_COMMENTS** C99 style single line comments (//) should not be used. Prefer the block comment style instead. See: https://www.kernel.org/doc/html/latest/process/coding-style.html#commenting ...but that coding-style document says nothing about C99 comments. I move that we ignore checkpatch here. --=20 Jeff Layton