Date: Tue, 19 Aug 2014 22:17:01 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: Ronald Klop <ronald-lists@klop.ws>, freebsd-fs@freebsd.org Subject: Re: Strange effect of zfs rename Message-ID: <53F3B0BD.406@digiware.nl> In-Reply-To: <op.xksnf3hkkndu52@ronaldradial.radialsg.local> References: <53E61706.4010604@digiware.nl> <op.xksnf3hkkndu52@ronaldradial.radialsg.local>
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On 18-8-2014 17:17, Ronald Klop wrote: > On Sat, 09 Aug 2014 14:41:42 +0200, Willem Jan Withagen > <wjw@digiware.nl> wrote: > >> Hoi, >> >> In the process of creating backups I have this sequence of: >> >> /sbin/zfs destroy zfsraid/backups@Saturday-2 >> /sbin/zfs rename -f zfsraid/backups@Saturday zfsraid/backups@Saturday-2 >> /sbin/zfs snapshot zfsraid/backups@Saturday >> >> But then I end up with: >> # cd /backups/.zfs/snapshot >> # ll >> ls: Saturday-2: Device busy >> total 116 >> 0 dr-xr-xr-x 11 root wheel 11 Aug 9 14:15 ./ >> 0 dr-xr-xr-x 4 root wheel 4 Jul 30 22:07 ../ >> 17 drwxr-xr-x 13 root wheel 16 Jul 31 09:54 20140801/ >> 17 drwxr-xr-x 18 root wheel 21 Aug 5 01:03 Friday/ >> 17 drwxr-xr-x 16 root wheel 19 Aug 3 01:03 Monday/ >> 17 drwxr-xr-x 15 root wheel 18 Aug 2 01:03 Sunday/ >> 17 drwxr-xr-x 18 root wheel 21 Aug 5 01:03 Thursday/ >> 17 drwxr-xr-x 17 root wheel 20 Aug 4 01:03 Tuesday/ >> 17 drwxr-xr-x 18 root wheel 21 Aug 5 01:03 Wednesday/ >> Exit 1 >> >> And the device does not becomen not-busy even after a "long" wait. >> >> The way to remedy this is: >> /sbin/zfs unmount -f zfsraid/backups >> /sbin/zfs mount zfsraid/backups >> >> After that the snapshot-dir is as it should. >> >> I'm running: >> FreeBSD zfs.digiware.nl 9.3-STABLE FreeBSD 9.3-STABLE #272 r269145M: Sun >> Jul 27 06:50:06 CEST 2014 >> root@zfs.digiware.nl:/usr/obj/usr/srcs/src9/src/sys/ZFS amd64 >> >> Can other reproduce this? Or is my system suffering from bitrot? >> >> Regards, >> --WjW > > I don't see this. I used to work on 9-STABLE and now on 10-STABLE (from > august 5th). > > I use zfs rename a lot for handling my snapshots, but I do not use the > -f option. I must say I never need to go into the .zfs/snapshot > directories, so they are mounted seldom. I just went into them today for > a test, but I don't have 'Device busy' problems. Do you keep such a > directory active somewhere? No not really, it is like you suggest: rarely go into the snapshots for recovery. But I do keep 'm online. I'm just using test(1) to see if the snapshot I'd like to destroy is really there. Which is easily done by testing if the snapshot dir exists. --WjW
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