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 4768A280CC8; Tue, 24 Jun 2025 12:34:07 +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=1750768448; cv=none; b=FsxOzxfXtJkCZQh6/L0QKiiaE/LA7RdPol79mlDtpLO2w3pOrbKPeZgURClVBZiGSWzLeGi9nJQXTnoLPqWMd/Pay/3074dCGquvYv61sHraxti2DUppSkMP5gKjebF6mS6Ofkgcr2G3kCRwLI3P5Z3IFJWCjGYqSvjhVbAqY+8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750768448; c=relaxed/simple; bh=J24vTlX437+hChkV2ad5kSAeXTAcjqgp9PNzVglucRc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fCwJFxAInHTpMX4talxBnaq/rVj+n8PDNpQoC9nfP05Qrx2cHtoLMNudrL82w0HsIUtAkgw07upgQ5ba/EWf35bTtRQ9n/PRgF4UkZoHj15sK6gjsLh6FKIqI8EKtloYy5g4TiS1NFOEeJSrcgcpsjYJp0uxIxpKAQcQRhfpNiU= 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=RSNMSOOo; 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="RSNMSOOo" 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=J24vTlX437+hChkV2ad5kSAeXTAcjqgp9PNzVglucRc=; b=RSNMSOOo5wRyUf8j5Hl2/GcLV9 u08zA5Ey/ntiLlDL6za+d7NRhOvyFWs+R7j9wVOy5sZwQ6W5TS51Up8iy3OqlQEoNHkEZkWq1/9aQ EFJjtVfF2zu8q1Ee6HWqT+okS8DhhSI9P3ImG16xLPv8TmcZIGyiXhm9irFWRBcuzf615GsiYQYBD HK6p/r4GnXi18od3WXxhJ0ehvkrIuLtvaJvLkfJhCENTS+PMHBe0MdmIPthQ99n+jtRYQcqyXk2P3 pNJw9uCCpz5yboh0aacfZpIlyyVSQc0tS3sUjGpEs4yob93rO9gBMjQOh9MWuJJJWCwflwx9p3LoJ NzjX3Qcg==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1uU2qk-00000005b7t-3rZx; Tue, 24 Jun 2025 12:34:06 +0000 Date: Tue, 24 Jun 2025 05:34:06 -0700 From: Christoph Hellwig To: Qu Wenruo Cc: Christian Brauner , Christoph Hellwig , Jan Kara , linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk Subject: Re: [PATCH RFC 5/6] fs: introduce a shutdown_bdev super block operation Message-ID: References: <20250623-worte-idolisieren-75354608512a@brauner> <84d61295-9c4a-41e8-80f0-dcf56814d0ae@suse.com> <20250624-geerntet-haare-2ce4cc42b026@brauner> <8db82a80-242f-41ff-84b8-601d6dcd9b9d@suse.com> <20250624-briefe-hassen-f693b4fe3501@brauner> 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: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Tue, Jun 24, 2025 at 07:21:50PM +0930, Qu Wenruo wrote: > Thus the new callback may be a good chance for those mature fses to explore > some corner case availability improvement, e.g. the loss of the external > journal device while there is no live journal on it. > (I have to admin it's super niche, and live-migration to internal journal > may be way more complex than my uneducated guess) I don't know know of a file system that has a log/journal where is isn't integral part of the metadata write architecture.