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[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> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Tue, 05 Dec 2023 22:06:50 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784511528095624787 X-GMAIL-MSGID: 1784511528095624787 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);