Date: Mon, 2 Jun 2014 09:47:43 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: "Michael W. Lucas" <mwlucas@michaelwlucas.com> Cc: geom@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org>, Ryan Stone <rysto32@gmail.com>, Allan Jude <allanjude@freebsd.org> Subject: Re: diskid documentation Message-ID: <alpine.BSF.2.00.1406020941460.9363@wonkity.com> In-Reply-To: <20140602153651.GB4116@bewilderbeast.blackhelicopters.org> References: <20140601134147.GA99583@bewilderbeast.blackhelicopters.org> <538C7B71.20109@freebsd.org> <CAFMmRNyL=y14h6Ov0CDgXovt0zN9VuK93vYQL80Syab2CkkoPQ@mail.gmail.com> <20140602153651.GB4116@bewilderbeast.blackhelicopters.org>
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On Mon, 2 Jun 2014, Michael W. Lucas wrote: > On Mon, Jun 02, 2014 at 10:45:52AM -0400, Ryan Stone wrote: >> On Mon, Jun 2, 2014 at 9:26 AM, Allan Jude <allanjude@freebsd.org> wrote: >>> It also tends to sometimes hide the gpt label provider on me (not sure >>> in which cases it does this, but it is annoying) >> >> This happens when something (e.g. zfs) happens to open the diskid >> provider instead of the gpt label. For me this ended up being a bit >> more than annoying; my swap was mounted in /etc/fstab via a gpt label >> so I silently lost my swap when I did an upgrade. > > Wait-- one type of one label can hide another? > > I thought a big point of labels was to remove ambiguity... Can't get more unambiguous than only having one label! The word to look for here is "wither". When a device label name is opened exclusively (like mounting a device), other labels for that device are supposed to "wither" and disappear from view. (My understanding of this is incomplete. Garrett Wollman sent me a very nice explanation of how this works, which I have read but not enough times yet.)
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