svn commit: r344316 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

Shawn Webb shawn.webb at
Tue Feb 19 23:44:15 UTC 2019

On Tue, Feb 19, 2019 at 11:35:56PM +0000, Pawel Jakub Dawidek wrote:
> Author: pjd
> Date: Tue Feb 19 23:35:55 2019
> New Revision: 344316
> URL:
> Log:
>   The way ZFS searches for its vdevs is the following: first it looks for
>   a vdev that has the same name as the one stored in metadata and that has
>   all VDEV labels in place. If it cannot find a GEOM provider with the given
>   name and all VDEV labels it will scan all GEOM providers for the best match
>   (the most VDEV labels available), but here the name is ignored.
>   In case the ZFS pool is created, eg. using GPT partition label:
>   	# zpool create tank /dev/gpt/tank
>   everything works, and on every import ZFS will pick /dev/gpt/tank and
>   not /dev/da0p4.
>   The problem occurs when da0p4 is extended and ZFS is unable to find all
>   VDEV labels in /dev/gpt/tank anymore (the VDEV labels stored at the end
>   of the partition are now somewhere else). In this case it will scan all
>   GEOM providers and will pick the first one with the best match, ie. da0p4.
>   Fix this problem by checking the VDEV/provider name even if we get the same
>   match. If the name is the same as the one we have in pool's metadata, prefer
>   this GEOM provider.
>   Reported by:	oshogbo, Michal Mroz <m.mroz at>
>   Tested by:	Michal Mroz <m.mroz at>
>   Obtained from:	Fudo Security
> Modified:
>   head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c

At the risk of painting a bikeshed a lovely color of neon purple, I'm
curious about if/how these types of commits get merged upstream to
(OpenZFS|Illumos|ZFS On Linux|where ever ZFS upstream is now|I'm very
confused|is anyone else confused where upstream is?).

Who is upstream? Is work like this going to remain as a downstream
patch to ZFS? Or is FreeBSD going to work to upstream this type of

I hope my curiousity doesn't offend anyone. ;)


Shawn Webb
Cofounder and Security Engineer

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