From patchwork Wed Dec 6 06:05:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Chinner X-Patchwork-Id: 13481047 X-Patchwork-Delegate: paul@paul-moore.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fromorbit-com.20230601.gappssmtp.com header.i=@fromorbit-com.20230601.gappssmtp.com header.b="Xjve/251" Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 965A8D42 for ; Tue, 5 Dec 2023 22:06:35 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id 41be03b00d2f7-5c66bbb3d77so2105851a12.0 for ; Tue, 05 Dec 2023 22:06:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fromorbit-com.20230601.gappssmtp.com; s=20230601; t=1701842795; x=1702447595; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=p8wgNl1PchXcHI5F0qOFxbj06sbuE+5yXttvrgVz+ro=; b=Xjve/251Fqx9HCpRQ+sthCif1vXTCZi9TuR3dET8NQ5NeHqYD1yi+XNWOLpLkuK8IO 01Ohgxf0N/isIx5y0MdGk72WDMA4YrIEbeO+E0EYikWDO2FkIejJgiys1VYPmwXT5nrW D6eUEuoK/+u9lOIpKSYJwd2RFXp+wnah6N1enac4ckeuZ5vQGPMOXVUVkUIlQo/XzBL9 lyxMzrceGSNV/3XAIKiwTri/q9fMAdZXqc9w0t0zjgiO3UgnSj1gyGj7fbqmGbEITj9D kOLZ5A0r+dw5szr5k3BT8OXKr6OBrHs1C6uGgOyY09Ug4gKA4qDSy/uJHZgYnnart1+n +jLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701842795; x=1702447595; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=p8wgNl1PchXcHI5F0qOFxbj06sbuE+5yXttvrgVz+ro=; b=rAc/c3k0bVPQ7zHnEuEYibQQwKTQV8s+211bFdcE5/swcptx5ZyXmyfUjprF1AParG hzFkXXhYUAveYzwzFWxE1xYh9B1Z5GIKlY5vruCHTe+rg8GVezX5i8bpmA3qZASac7Qg G+vtRcJo9blIdd9P5fgF5xdFASwBj7FwGVfBDWl9D1ve0xx6S7oNKTm42F1tGhc9+fam OjydVrC34lUZnzIG9gJvEknT3hGuKZLkGk5g5D+NXHXjLTZgy5+XJRVu5b8MUb0aQf1u ULpfxXnFMupwKcDAK65to/nlcrEOOqunvBZQno95nMZkLN4EQIMzxV2PTWdQ1RleroV2 CATQ== X-Gm-Message-State: AOJu0YxDfyUU2sUZbbO1+B3fI3PlllEHBxNyd0evOnzz+GXobh6Bv1Vm 9jKOQFsO5pl6ZqEgQx571O6Y0g== X-Google-Smtp-Source: AGHT+IEdPXfNmvKvrswUKJHm+sFsPS7aPY/u0WjJJT2ny1b5k9BwlvRmtzalQC13yVeEtaaHy4KiTw== X-Received: by 2002:a05:6a20:c19e:b0:18f:97c:8254 with SMTP id bg30-20020a056a20c19e00b0018f097c8254mr292006pzb.94.1701842794864; Tue, 05 Dec 2023 22:06:34 -0800 (PST) Received: from dread.disaster.area (pa49-180-125-5.pa.nsw.optusnet.com.au. [49.180.125.5]) by smtp.gmail.com with ESMTPSA id p12-20020a170902bd0c00b001d0c5037ed3sm2322833pls.46.2023.12.05.22.06.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 22:06:33 -0800 (PST) Received: from [192.168.253.23] (helo=devoid.disaster.area) by dread.disaster.area with esmtp (Exim 4.96) (envelope-from ) id 1rAl3I-004VOz-0c; Wed, 06 Dec 2023 17:06:31 +1100 Received: from dave by devoid.disaster.area with local (Exim 4.97-RC0) (envelope-from ) id 1rAl3H-0000000BrVV-32vJ; Wed, 06 Dec 2023 17:06:31 +1100 From: Dave Chinner To: linux-fsdevel@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-cachefs@redhat.com, dhowells@redhat.com, gfs2@lists.linux.dev, dm-devel@lists.linux.dev, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 07/11] hlist-bl: add hlist_bl_fake() Date: Wed, 6 Dec 2023 17:05:36 +1100 Message-ID: <20231206060629.2827226-8-david@fromorbit.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231206060629.2827226-1-david@fromorbit.com> References: <20231206060629.2827226-1-david@fromorbit.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Dave Chinner in preparation for switching the VFS inode cache over the hlist_bl lists, we nee dto be able to fake a list node that looks like it is hased for correct operation of filesystems that don't directly use the VFS indoe cache. Signed-off-by: Dave Chinner --- include/linux/list_bl.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h index ae1b541446c9..8ee2bf5af131 100644 --- a/include/linux/list_bl.h +++ b/include/linux/list_bl.h @@ -143,6 +143,28 @@ static inline void hlist_bl_del_init(struct hlist_bl_node *n) } } +/** + * hlist_bl_add_fake - create a fake list consisting of a single headless node + * @n: Node to make a fake list out of + * + * This makes @n appear to be its own predecessor on a headless hlist. + * The point of this is to allow things like hlist_bl_del() to work correctly + * in cases where there is no list. + */ +static inline void hlist_bl_add_fake(struct hlist_bl_node *n) +{ + n->pprev = &n->next; +} + +/** + * hlist_fake: Is this node a fake hlist_bl? + * @h: Node to check for being a self-referential fake hlist. + */ +static inline bool hlist_bl_fake(struct hlist_bl_node *n) +{ + return n->pprev == &n->next; +} + static inline void hlist_bl_lock(struct hlist_bl_head *b) { bit_spin_lock(0, (unsigned long *)b);