From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 E768A30103A for ; Mon, 10 Nov 2025 09:45:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762767913; cv=none; b=sE7uEE+6IoElJ+uNs0Wm++lt8VSV1uDSWuvXj6zjEvwLE9VbufdLQYgQfq59YamEDkeREZziN9b39pPVBHWLhKQe4Wl/mhuZ21Aa5WPNPbLVfIXzZnO/HhjDnq4VlqB5klP1ow7Uh1vhhheCw5YoUZ+46NldeojCz9/FgrfAVhw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762767913; c=relaxed/simple; bh=goBB6a9ijYsjH1ApwGICOTD9RRiuY+gQpLOMLI1pKjM=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=IvG98xHzWebx521S2wv+ZoYD8Ja/wzQMai1tpuBDgGYM8pTsbsneNK6h0ZwrKlUeoB5hSfnyS5q9LW23O6iCJoROyMjqW0FDGom4MrCFdPtFsXjrqSsxYyiRkU/OOk70/ipEUR7XPvBpqiJ1X/T6zrSiMtLwAA4pvAliwnEEetk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=PJCyqr6w; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PJCyqr6w" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1762767910; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=UVXpka/wfvK1NTQpXcElrqr+Eu4p1Ghvs93NaoRYmkY=; b=PJCyqr6wOsg+Np8R3oma71qadk2+aL8WKVPpNwZ28A6d1yEz9DolFTpft/28V/z+VPiP3Z 4OnPGx1QyNTVLK2nFZgADMQdcZrUO5TFC/LXlqLJWZx8tkw/8yfLoXp7kf7Cyzt8/D37eD mkJnr7FdQylsQdTz6Fwj6+Aupb99A6I= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-691-tAv0p3UENYmR87MU9ynLsg-1; Mon, 10 Nov 2025 04:45:06 -0500 X-MC-Unique: tAv0p3UENYmR87MU9ynLsg-1 X-Mimecast-MFC-AGG-ID: tAv0p3UENYmR87MU9ynLsg_1762767905 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 12E97195606D; Mon, 10 Nov 2025 09:45:05 +0000 (UTC) Received: from fweimer-oldenburg.csb.redhat.com (unknown [10.44.32.47]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 25B581800576; Mon, 10 Nov 2025 09:45:00 +0000 (UTC) From: Florian Weimer To: Christoph Hellwig Cc: Dave Chinner , Matthew Wilcox , Hans Holmberg , linux-xfs@vger.kernel.org, Carlos Maiolino , "Darrick J . Wong" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, libc-alpha@sourceware.org Subject: Re: [RFC] xfs: fake fallocate success for always CoW inodes In-Reply-To: <20251110093701.GB22674@lst.de> (Christoph Hellwig's message of "Mon, 10 Nov 2025 10:37:01 +0100") References: <20251106133530.12927-1-hans.holmberg@wdc.com> <20251106135212.GA10477@lst.de> <20251106170501.GA25601@lst.de> <878qgg4sh1.fsf@mid.deneb.enyo.de> <20251110093701.GB22674@lst.de> Date: Mon, 10 Nov 2025 10:44:58 +0100 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 * Christoph Hellwig: > I think what Florian wants (although I might be misunderstanding him) > is an interface that will increase the file size up to the passed in > size, but never reduce it and lose data. Exaclty. Thank you for the succinct summary. Florian