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 5C6F41E1A18; Fri, 21 Mar 2025 05:23:38 +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=1742534619; cv=none; b=dyXSJazOEzlOHSAMuQHVibNmXcQ756UUuoVxOkZpyDK+kmxdZ8YBl9os+MEBMwK+TA1Opyd92muUJOjcjhyZxBA1eH8+NPnz055IBG4QoWbJfFKxi9PHFWB4mqSlUd2WJzIBkCb9cc+bUSznEMqQymzTczD1YsperlahFKddNR0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742534619; c=relaxed/simple; bh=34NarvBI3/OFBmA+omarR4WyYQPix3PfW4NaIq2fEEE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tElqwRXEidNxDLvE9iSxk+y52xH1ogIvfnlB1SDnbTuCFccxRXAIVDs5/qGK5NDOS/uNtO1gPddYDtZsRd6qzq1WPAtg3qC9wCNLmvEHVDb7Nk/TpnyMAD1MDC7rNcijUd+kX1rAVTAbBm3hkZGdGbTcMK2A5pGnLv5mvLFuSvE= 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=e7YNCppK; 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="e7YNCppK" 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=kS+by7DzfHzQ8bGMun9P/TaQZveZzse+FJtttQBHQe0=; b=e7YNCppKFLNAT/lvMs7g7VVq+T WhUc7AZyXsvxyTZ8BPunT3UxiazE+0GoS5MDX6dXXTniN30oOSN7/00Q5WgLkK/V8CgGwnvd9S5qu xZGBP8CmtVsV6l+mxoIX5NrywKe60TIS4dKLwSlm31AIpbois1NCPLc6e6RusOUYHfY7ZPceWk5P8 m/qAVwDpc2RuCmpHGLxAAwjvfEQDn/VqC3WGp0U+qItTWW8yBFK8W2NQkaNtJ/YUUWwjsA2x4vkJB q2Vq3TNUFUwuYH0f6bbiH7wZDr8aSeD8jGhHobm/Yp/39BLJ83TWR/EMHSMq3Ek8SfHcAsp/h6HOh upOPLiIQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tvUr3-0000000DtL6-2acm; Fri, 21 Mar 2025 05:23:37 +0000 Date: Thu, 20 Mar 2025 22:23:37 -0700 From: Christoph Hellwig To: James Bottomley Cc: linux-fsdevel@vger.kernel.org, lsf-pc@lists.linux-foundation.org, "Rafael J. Wysocki" , Pavel Machek , Len Brown , linux-pm@vger.kernel.org Subject: Re: [LSF/MM/BPF TOPIC] Filesystem Suspend Resume Message-ID: References: <0a76e074ef262ca857c61175dd3d0dc06b67ec42.camel@HansenPartnership.com> Precedence: bulk X-Mailing-List: linux-pm@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 Thu, Mar 20, 2025 at 02:15:15PM -0400, James Bottomley wrote: > On Thu, 2025-03-20 at 09:48 -0700, Christoph Hellwig wrote: > [...] > > We finally got hibernate to freeze file system on suspend, > > I was looking for this to see if I could possibly plug something in for > pseudo filesystems that don't have backing devices. However, I can't > find the path where suspend causes freeze (at least the bdev doesn't > seem to register any power notifier like the scsi block device does), > where is the code? Looking again I can't find it either. On the internet I find a patch adding it from 2006: https://groups.google.com/g/fa.linux.kernel/c/dtxsNJ7ks58/m/mqU8SIAbvLgJ But I couldn't see if it got applied or disappaeared again somehow. Adding the relevant maintainers.