From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8CBB3C44515 for ; Mon, 20 Jul 2026 08:04:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.sourceforge.net; s=beta; h=Content-Transfer-Encoding:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Subject:In-Reply-To:MIME-Version:References:Message-ID:To:From:Date:Sender: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=+h7B5dC5yxEItbQfelUfi9pfVkJDzln+7evaUakSp6Q=; b=guwfoCXJn/9t1M6bzY6tdChF1q ts2I0u1+xf4G+OjR35VkxshgZLR3G0RrGHrxNBmAaVUanFH0gXhjYaP+TttPBUWCRgJcrFE1vTP9a hnDzrnv624QVKiq5T4rLEmeDW6Hjvbp4kDXOuoAGQgesBIKwGlPcD2kbc6klsWEJ8Zo8=; Received: from [127.0.0.1] (helo=sfs-ml-1.v29.lw.sourceforge.com) by sfs-ml-1.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1wlizB-0005xr-Pa; Mon, 20 Jul 2026 08:04:23 +0000 Received: from [172.30.29.66] (helo=mx.sourceforge.net) by sfs-ml-1.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1wliz3-0005tw-9W for linux-f2fs-devel@lists.sourceforge.net; Mon, 20 Jul 2026 08:04:15 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=In-Reply-To:Content-Type:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=+k/S57ilndGjoJss1cqjmQ22UwAd2c+Gg+Fclh9PZOU=; b=O54GgtZeNUFc2+tQy3FHfEw//X wVDD8csAhq6K1DTdj7CA6q/BCnOc3Iayxea9P6XRPpgaHi9GiwvsDfUmc4B9XKKl9SQISmTLnP9rb E875UcDPSEi8L1IoOKrg0ee7okeKp9gE6A1g0u9QJHiF+3MLwK/RkJQXt7sFTMMFSkP4=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To :From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=+k/S57ilndGjoJss1cqjmQ22UwAd2c+Gg+Fclh9PZOU=; b=QysoKRJyfaBuIQifH51S7gyqrp Sc2g3zxwcVrlg+LVCq8xYIkjfPi81LPIoxboZpg9iWG3FiAafAXWOIbWWx+CAwUvHzmblU+Qm6p2R jnaOfooDowY6pyEfqHIZ7EiEkAW/b86CV0BbVH3PyXkRmY9Bo7NA9fU0ptDmsIqU/q6Q=; Received: from bombadil.infradead.org ([198.137.202.133]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.95) id 1wliyz-0001X0-UW for linux-f2fs-devel@lists.sourceforge.net; Mon, 20 Jul 2026 08:04:14 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=+k/S57ilndGjoJss1cqjmQ22UwAd2c+Gg+Fclh9PZOU=; b=pjBU6g1bY/5CCKbkWnRO68c+lZ hN+mOASOwbENw9K3BviGH93pyvJIgn8pjfVKR5gDS2Sw8kVKSAw15MWDzUM1UsYVFOXB8lQOeKMT2 QeMk9wl83lEG/h3aKcExIlga32UzGiy+8fqX9cWEpht1MfzZokqHdm0ZVpeknqkkpiPSe19/Fg/GY GMueV8iBvh8MA8z2N8be60rj5R1yInaoG81s2GIzNDzBZ+R/LcccReOLXP2yKXacrzZmYGTCH5+zM GYz00WY02oSpeSDqGHwN5YpBDq7pJunwUxTxDH4muBcZgPtfsWUNv74RNayKJIAKZR4ZeaBGykASu AQ3YyU8g==; Received: from hch by bombadil.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wliyp-000000069mR-0zhX; Mon, 20 Jul 2026 08:04:03 +0000 Date: Mon, 20 Jul 2026 01:04:03 -0700 From: Christoph Hellwig To: Chao Yu Message-ID: References: <20260622070438.1542638-1-jprusakowski@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Headers-End: 1wliyz-0001X0-UW Subject: Re: [f2fs-dev] [PATCH] generic/064: allow 50 extents on F2FS after fcollapse X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zorro Lang , fstests@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Christoph Hellwig , jaegeuk@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On Tue, Jun 30, 2026 at 08:09:19PM +0800, Chao Yu wrote: > > Let me explain it briefly, this is because f2fs has only one copy of reverse > mapping table (aka SSA), for any checkpointed data, we can not modify SSA info > directly during remap, otherwise, after sudden power-cut, we will suffer > inconsistent issue in between reverse mapping table and mapping table. So, f2fs > choose to rewrite for any checkpointed data. So looking at this explanation and the code, f2fs does not actually support COLLAPSE_RANGE at all, but emulates by doing a full data copy. What is the point of this and lying to the user that it supports and operation that isn't actually supported as the intended metadata only swizzle? _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel