ZFS snapshot renames failing after upgrade to 9.2

[Steven Hartland]

This could also be due to the following issue which there
will be a fix soon:
https://www.illumos.org/issues/4322

    Regards
    Steve

----- Original Message ----- 
From: "Steven Hartland" <killing at multiplay.co.uk>
To: "Matt Magoffin" <matt at msqr.us>; <freebsd-fs at freebsd.org>
Sent: Thursday, November 14, 2013 6:43 PM
Subject: Re: ZFS snapshot renames failing after upgrade to 9.2


> Sounds like you may have an automatic hold still present.
>
> What does the following report:
> zfs holds -r <snapshot>
>
>    Regards
>    Steve
> ----- Original Message ----- 
> From: "Matt Magoffin" <matt at msqr.us>
> To: <freebsd-fs at freebsd.org>
> Sent: Thursday, November 14, 2013 6:35 PM
> Subject: ZFS snapshot renames failing after upgrade to 9.2
>
>
> Hello,
>
> I have a system that had been running FreeBSD 9.1 for some time, and I recently upgraded to 9.2. I've been using this simple 
> script to create daily, rotating ZFS snapshots via cron:
>
> http://andyleonard.com/2010/04/07/automatic-zfs-snapshot-rotation-on-freebsd/
>
> Essentially the snapshots are renamed and then a new snapshot is created with the same name as the most recently created 
> snapshot. Since the upgrade to 9.2, however, the snapshots aren't able to be renamed. I end up with an error like this:
>
> cannot rename 'zdata/home': a child dataset already has a snapshot with the new name
> cannot create snapshot 'zdata/home at daily.0': dataset already exists
>
> Once that happens, zfs will show two snapshots:
>
> # zfs list -t snapshot -o name,creation,used,referenced |grep zdata/home
> zdata/home at daily.1                                Wed Nov 13  0:00 2013  50.5K  91.0G
> zdata/home at daily.0                                Thu Nov 14  0:00 2013      0  91.0G
>
> However, trying to list the snapshots results in this error:
>
> # ls .zfs/snapshot/
> ls: daily.1: Device busy
> daily.0
>
> I can destroy the daily.1 snapshot:
>
> # zfs destroy zdata/home at daily.1
> # zfs list -t snapshot -o name,creation,used,referenced |grep zdata/home
> zdata/home at daily.0                                Thu Nov 14  0:00 2013      0  91.0G
> # ls .zfs/snapshot/
> daily.0
>
> Then if I try to rename it like the script would, I end up in the same "Device busy" state:
>
> # zfs rename zdata/home at daily.0 zdata/home at daily.1
> # zfs list -t snapshot -o name,creation,used,referenced |grep zdata/home
> zdata/home at daily.1                                Thu Nov 14  0:00 2013      0  91.0G
> # ls .zfs/snapshot/
> ls: daily.1: Device busy
>
> Does anyone have any ideas how to get the renames working?
>
> -- m@
>
>
>
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