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Date:      Mon, 7 Nov 2022 19:43:30 -0500
From:      Alexander Motin <mav@FreeBSD.org>
To:        Dan The Man <dan@sunsaturn.com>, freebsd-current@FreeBSD.org
Subject:   Re: vfs.zfs.vol.recursive hang makes it impossible to mount zvol
Message-ID:  <62348dc1-7f9a-f8ae-db77-f2f5d8a709d8@FreeBSD.org>
In-Reply-To: <da17977d-b37e-aa79-372f-326b2698f418@sunsaturn.com>
References:  <da17977d-b37e-aa79-372f-326b2698f418@sunsaturn.com>

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On 07.11.2022 18:53, Dan The Man wrote:
> router:~ # sysctl vfs.zfs.vol.recursive=1
> vfs.zfs.vol.recursive: 0 -> 1
> router:~ # zpool import
>     pool: testing
>       id: 8013833172609421701
>    state: ONLINE
>   action: The pool can be imported using its name or numeric identifier.
>   config:
> 
>          testing                   ONLINE
>            zvol/zroot/asterisk2p3  ONLINE
> router:~ # zpool import -fR /mnt testing
> 
> This hangs forever....
> The only way to import that pool from the zvol that I know of.....

Mounting ZFS from ZVOLs is blocked for a reason.  It causes deadlocks 
due to lock recursion.  I don't know what you are trying to achieve, but 
as alternatives, the ZVOL can be passed inside VM, it can be shared via 
iSCSI (even inside the host itself), etc.

-- 
Alexander Motin



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