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Wed, 23 Sep 2020 13:31:33 +0000 Subject: Re: [PATCH] ovl: introduce new "index=nouuid" option for inodes index feature To: Miklos Szeredi Cc: Amir Goldstein , Vivek Goyal , linux-unionfs@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200923125014.181931-1-ptikhomirov@virtuozzo.com> From: Pavel Tikhomirov Message-ID: Date: Wed, 23 Sep 2020 16:31:25 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 In-Reply-To: <20200923125014.181931-1-ptikhomirov@virtuozzo.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: AM0PR01CA0165.eurprd01.prod.exchangelabs.com (2603:10a6:208:aa::34) To AM6PR08MB4756.eurprd08.prod.outlook.com (2603:10a6:20b:cd::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.41] (95.179.127.150) by AM0PR01CA0165.eurprd01.prod.exchangelabs.com (2603:10a6:208:aa::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3412.20 via Frontend Transport; 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On 9/23/20 3:50 PM, Pavel Tikhomirov wrote: > dd if=/dev/zero of=loopbackfile.img bs=100M count=10 > losetup -fP loopbackfile.img > losetup -a > #/dev/loop0: [64768]:35 (/loop-test/loopbackfile.img) > mkfs.ext4 /root/loopbackfile.img > mkdir loop-mp > mount -o loop /dev/loop0 loop-mp > mkdir loop-mp/{lower,upper,work,merged} > mount -t overlay overlay -oindex=on,lowerdir=loop-mp/lower,\ > upperdir=loop-mp/upper,workdir=loop-mp/work loop-mp/merged > umount loop-mp/merged > umount loop-mp > e2fsck -f /dev/loop0 > tune2fs -U random /dev/loop0 > > mount -o loop /dev/loop0 loop-mp > mount -t overlay overlay -oindex=on,lowerdir=loop-mp/lower,\ > upperdir=loop-mp/upper,workdir=loop-mp/work loop-mp/merged > #mount: /loop-test/loop-mp/merged: > #mount(2) system call failed: Stale file handle. > > If you just change the uuid of the backing filesystem, overlay is not > mounting any more. In Virtuozzo we copy container disks (ploops) when > crate the copy of container and we require fs uuid to be uniq for a new > container. -- Best regards, Tikhomirov Pavel Software Developer, Virtuozzo.