From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (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 278071E5B83; Fri, 21 Mar 2025 18:21:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742581268; cv=none; b=mCM7Kfom7gI7uFmxmHx45PTDWtYqSw0dHrVUpOGphZZYyRKtztrSXTXB+SNTH0xeVt0+I5by/rRmBI23MT28RpWlvvVhsKrT+YFkDlg63XIMer2sw7zPaFtj8jEIVHDvlR9JnLlK2aze2vvjtJfhc9atEgBQW2DWzfvNw9mDP6s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742581268; c=relaxed/simple; bh=CnRXOkGdp6U9zdXWyuv+XF0FsEqh1ZW1jMmMpJjX5fY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=dYtBX+Naxf8680BPcKaewIuWs87SgdKm2q8g0Ix5RfVuNovR21i162J6F8GP1/4KB7Tztaapc+Jc10Q3lrMHrMeRhTePQvPpSEYYVEkSrpjI8ZFZ2onYwLk0SHt8Niv/cFrckR6lJxWe1R+rYfS/gequPOKWl1xtqP5RSj8bCKA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=EpLgaEtj; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="EpLgaEtj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1742581260; bh=CnRXOkGdp6U9zdXWyuv+XF0FsEqh1ZW1jMmMpJjX5fY=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=EpLgaEtjUxdA7qg0KSFytwmH0IPIH+gRb2dnb/aFsOUk86RaidO68YTdVnFz6WLy4 uWw/rcYiV6qMOVJQuiLmd4LRYgmOphijkHFSUIY3Kk+7oiU8Hv6fUzOxDJdBQK+Pzb li4Al+qt7NLeox1s8dpaQsBGp/l2T9s1NlZpShpU= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4302:c21::a774]) (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 lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 990EA1C019A; Fri, 21 Mar 2025 14:21:00 -0400 (EDT) Message-ID: Subject: Re: [LSF/MM/BPF TOPIC] Filesystem Suspend Resume From: James Bottomley To: Lukas Wunner Cc: Christoph Hellwig , linux-fsdevel@vger.kernel.org, lsf-pc@lists.linux-foundation.org, "Rafael J. Wysocki" , Pavel Machek , Len Brown , linux-pm@vger.kernel.org Date: Fri, 21 Mar 2025 14:20:59 -0400 In-Reply-To: References: <0a76e074ef262ca857c61175dd3d0dc06b67ec42.camel@HansenPartnership.com> <576418420308d2511a4c155cc57cf0b1420c273b.camel@HansenPartnership.com> <62bfd49bc06a58e435431610256e722651e1e5ca.camel@HansenPartnership.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2025-03-21 at 18:17 +0100, Lukas Wunner wrote: > On Fri, Mar 21, 2025 at 01:00:24PM -0400, James Bottomley wrote: > > There's a final wrinkle in that if I plumb efivarfs into all this, > > it needs to know whether it was a hibernate or suspend, but I can > > add that as an extra freeze_holder flag. >=20 > Perhaps system_entering_hibernation() does what you need? efivarfs needs to know on the resume path, unfortunately, which that call doesn't seem to work for. Also filesystems would have to suspend before devices ... i.e. before this is set even in the suspend path, but I suppose it would be possible to design a flag that has the width of scope required (which would be about the same amount of work as simply adding the extra flags to communicate what the freeze or thaw are for). Regards, James