From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 8AC16286D70 for ; Mon, 30 Jun 2025 13:57:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751291842; cv=none; b=LKxKc8rQmBH1ewVjxK+6IFHjaA2+Pt+i5x4Zh58jAMwYxNbHJ06rQk0eYwYacj2zwJdFRz6vK8h4PIBpDMOVTzWxHuGNH3XwvaMrjDxkADKhbT78bbAokG7QLPV2x6aOd+oH09FwJTd1ie6Du79k7ke/nJV+SeZ/y0PKJCT3Y80= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751291842; c=relaxed/simple; bh=HLZLPft7i9xPhZ77hHlDJEGcvqwuTVriMQuEZRpqkyM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=K1MzfDF42B3UVYU6MVRH5cEWEXYr0SsMrSg5EFecx0bqfxN7KDgEsrbxHbFkW0RovwAA8f+vveIC/KYmsYIM/wv8YI9MxPtVMpHzcE3n6Pd8Rw9aLl92kZM9zFlAP2kUPo/uci8u7UKGbulBSawHAi6f+eZvU9Z1a5KALUQuWF4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=oR+HyGaQ; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="oR+HyGaQ" 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=h3gbbuOgJEHgEmYnImCOmBJG4jeDCyJls3ESX5/PpeY=; b=oR+HyGaQILkcqaHCT5XwAlvhcE h/WQQxfCvHkVuniP82tzYHmOfvvQDTxGWSci8sOJ9RD4u0pPvSl6lJWpNOirDLCI0ndkmVvguWkF1 59j1sW0PNfRgJiFbHtoQLem1ugUdHNzx7tcUN67BZUp5bVB3FhOcrGszTATl7SBlclhyjV7jpiGCj tUJDS3M/qYooE0vmNnAegq2pFwhYwA6szkTuwwqO1S4lttDzLiWaYnnRUXYFguVVGOqn7eMgM8fuy C3UJP0Xt3GSvYNT7mJmw0ynR/uYycLxj8xpJJRHJSMqkOPz3dQIzS+0c+15JGGRrxprB3fHi2VRs0 X3w9dEug==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1uWF0a-00000002SWR-0qqm; Mon, 30 Jun 2025 13:57:20 +0000 Date: Mon, 30 Jun 2025 06:57:20 -0700 From: Christoph Hellwig To: Mark Harmstone Cc: Christoph Hellwig , linux-btrfs@vger.kernel.org, framstag@rus.uni-stuttgart.de Subject: Re: restic backup with btrfs / Message-ID: References: <20250628173308.GB847325@tik.uni-stuttgart.de> <82b6ddab-0eef-47b8-8010-9b09fcb70444@harmstone.com> <5b928de3-579a-402d-bb75-e93b473de929@harmstone.com> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5b928de3-579a-402d-bb75-e93b473de929@harmstone.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Mon, Jun 30, 2025 at 02:53:23PM +0100, Mark Harmstone wrote: > > .. because it isn't. btrfs is the buggy one here breaking the old > > Unix tradition also (somewhat vaguely) encoded in Posix that st_dev must > > not changed except at a mount point. > > I know. But if POSIX assumes that every inode has a unique combination of > st_dev and st_ino, and that both are 64 bits, that's incompatible with the > design of btrfs. I know, we had a few discussions on that.