From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8D42F606A326 for ; Thu, 5 Nov 2026 20:36:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=qtuA/MkL; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=U6caPqpR DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Date: Content-Transfer-Encoding:Content-Type:References:In-Reply-To:Cc:To:Subject: From:Message-ID:MIME-Version:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=y9V1CIpIY4360pJxVlHm+5yZoVNA43rbHggh2CYfgcQ=; b=qtuA/MkLMIpugIOqvad4ABu9Ji QsGBmO3IoLceD0inGgOTUSo5e83T5hmeiwr8bgswZ6frwVaJlywA2foBnW9zi7e7sF1AnwHn/FLui VcZ407zTZGfXdSyViEdku0fX5p2mqe2gd6Fri06oC0SV/Xka5OA/69r5YBbbab8e9t+phCIsb+fek 0/XriDqkJxx3mLrBnCp+vejkAYEsbU47qk7MPWwnBEkH+/z3cVe/rtZRNhxI6b0WfgVHq8Y5geBZN BhGL4DmjuTi3qBIrdUHa55NcfNtSSBTKlcvLN4LYCbjLMXHRA2evpOif4uPZfcBdn1OE27Njn2h7F HaZAKGOw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP3Cc-0000000ALta-1tUE; Thu, 05 Nov 2026 19:32:50 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP3AC-0000000AKmf-3MZK for kexec@lists.infradead.org; Thu, 05 Nov 2026 19:30:27 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8DA4340487; Thu, 5 Nov 2026 19:30:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF0FC1F00A16; Thu, 5 Nov 2026 19:30:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793907020; bh=y9V1CIpIY4360pJxVlHm+5yZoVNA43rbHggh2CYfgcQ=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=U6caPqpRAcq7s3jABurFLTYAOyQNLF7KNwFcz7vL0owaKAFz2/Kmb1CSUDdsXURja KndJt79cCtvWCvNOTwi2inAusJtSM7xFcxVXh2P+h26yFHpcllhdCgktUZVCkwtiG9 /H3yjzLcrbjdiUSj7RiWzxjqFY9BFACxF6rXGygYvdaL3HgamlM8WqSmnW73wwg/9a HWJvJwieWwnyodMNwSKhOSyeyO8OGNd1qplxfETbINtVIeYgtd4CJo1Ro5mX0HKNqx xq+lWhJhP5SWQhNMI4K00P+V9JGUm/enmo6/5lUN5kqo3zAD4JBvrPHNPgj7bQqo45 NaifRmjsniAKg== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH RESEND v2 44/51] proc: sysctl: resume readdir after the last name it returned To: "Christian Brauner" Cc: "Linus Torvalds" , "Jann Horn" , "Josef Bacik" , "Chris Mason" , "Jeff Layton" , NeilBrown , "Eric Dumazet" , "Thomas Gleixner" , "Al Viro" , "Jonathan Corbet" , "Christoph Hellwig" , "Greg Kroah-Hartman" , "Joel Granados" , "Kees Cook" , "Jan Kara" , "Jan Kara" , linux-s390@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, linux-m68k@lists.linux-m68k.org, linux-serial@vger.kernel.org, "Takashi Iwai" , linux-ext4@vger.kernel.org, "Chuck Lever" , tytso@mit.edu, "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" In-Reply-To: <20261104-work-procfs-bugfixes-v2-44-021c84d852e0@kernel.org> References: <20261104-work-procfs-bugfixes-v2-0-021c84d852e0@kernel.org> <20261104-work-procfs-bugfixes-v2-44-021c84d852e0@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 05 Nov 2026 19:30:18 +0000 X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev Sender: "kexec" X-Spam-Status: No, score=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 X-Archived-By: > proc_sys_readdir() counts the entries of a directory and resumes a > listing at the number getdents64() stopped at. The entries are sorted > by name, so one that is registered or unregistered in between shifts > everything behind it by one. Listing /proc/sys/net/ipv4/conf with a > buffer that holds ".", ".." and "all" and registering a device whose > name sorts before "all" makes the next call return "all" a second time. > Unregistering one that sorted before the position makes it skip an > entry instead. So a listing that takes more than one call shows a name > twice, or not at all. Even the 64k buffer of ls needs a second call to > find the end of the directory, so a device that comes up right then > repeats the last entry. >=20 > So remember the name of the last entry a call emitted in the file and > resume at the first usable entry after it, like kernfs resumes after > the node it stopped at. The entry itself can't be pinned across calls, > unregistering waits for that. If the position was moved by a seek in > between the listing counts from the start like before, seeking to an > arbitrary position has never been better than that. >=20 > That also takes one walk down the tree to resume instead of a walk over > every entry in front of the position with a round trip through > sysctl_lock for each of them. >=20 > Fixes: 77b14db502cb ("[PATCH] sysctl: reimplement the sysctl proc support= ") > Cc: stable@vger.kernel.org > Signed-off-by: Christian Brauner (Amutable) Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261104-work-procf= s-bugfixes-v2-0-021c84d852e0@kernel.org?part=3D44