From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from verein.lst.de ([213.95.11.211]:57939 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750708AbdAXTuw (ORCPT ); Tue, 24 Jan 2017 14:50:52 -0500 Date: Tue, 24 Jan 2017 20:50:50 +0100 From: Christoph Hellwig Subject: Re: [PATCH v2] xfs: use per-AG reservations for the finobt Message-ID: <20170124195050.GA1025@lst.de> References: <1485194742-23185-1-git-send-email-hch@lst.de> <20170123192847.GM12985@birch.djwong.org> <20170124140247.GA26149@lst.de> <20170124164837.GI4780@birch.djwong.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170124164837.GI4780@birch.djwong.org> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: "Darrick J. Wong" Cc: Christoph Hellwig , linux-xfs@vger.kernel.org On Tue, Jan 24, 2017 at 08:48:37AM -0800, Darrick J. Wong wrote: > I'd just print out: > > "Per-AG reservation for AG ${agno} failed. Filesystem may run out of space." Sure, I can do that. > > if any of the (now three) invocations of __xfs_ag_resv_init() returns > ENOSPC, since the AG is more than 98% full. Some day, a sysadmin could > then use the fsmap data to identify which inodes are using the most > space in that AG and arrange to migrate/remove/etc the data to another > AG. But for all but the reflink one this can't happen as the reservations have been there since the beginning. And if they fail neverless we fail the mount. Or am I missing something here?