Date: Wed, 13 Oct 2010 08:29:06 +0200 From: Stefan Bethke <stb@lassitu.de> To: Andrey V. Elsukov <bu7cher@yandex.ru> Cc: stable@freebsd.org Subject: Re: Label question...why does ufs label vanish on mount? Message-ID: <B6AAC89E-5651-4B4B-B770-11443A7BCC22@lassitu.de> In-Reply-To: <4CB53BF7.1020408@yandex.ru> References: <20101012185100.5AA661CC3E@ptavv.es.net> <4CB53BF7.1020408@yandex.ru>
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Am 13.10.2010 um 06:56 schrieb Andrey V. Elsukov: > On 12.10.2010 22:51, Kevin Oberman wrote: >> For some reason the /dev/ufs/label entry that geom creates for every UFS >> formatted partition is deleted when the device is mounted. This is not >> the case for other file systems, though I have not tried them all. It >> makes the drive much harder to deal with when you have to keep track of >> which physical drive contains the labeled media. It is a particular >> issue for hald and the tools which depend on it. >> >> Is there a good reason for this odd behavior of UFS? If there is not a >> good reason, could it be changed? > > When you are opening provider for writing (i.e. mount FS) GEOM(4) > initiates SPOILING and all consumers that are attached to this provider > except one will self-destroyed. When you are closing provider GEOM(4) > initiates TASTING and consumers can return back. Look at man 4 geom > for details. That explains the mechanism, but not the rationale. Or is it just an unintended consequence? And how is da2p1 different from ufs/mylabel? (Mount da2p1 and ufs/mylabel is removed, but not the other way around.) Stefan -- Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811help
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