Date: Mon, 17 May 2010 16:02:07 +0200 From: Bernd Walter <ticso@cicely7.cicely.de> To: Matt Thyer <matt.thyer@gmail.com> Cc: freebsd-current@freebsd.org, ticso@cicely.de Subject: Re: fsck unable to read disk sectors Message-ID: <20100517140207.GZ92942@cicely7.cicely.de> In-Reply-To: <AANLkTinZqDH4jHeyk6WCccT6gSaQRTyMR7y0fr7h8d3W@mail.gmail.com> References: <permail-20100329221104f0889e8400006cd5-a_best01@message-id.uni-muenster.de> <3a142e751003291708nc3e110bjca1789cc807f61a2@mail.gmail.com> <AANLkTikKgJQ5iEHm8Zl45eAZY2ppsYYCkmXivVj89tXk@mail.gmail.com> <AANLkTim0zpd3iVHu-O6Zo8w_h8mtrLPdsrw9qDP0jKZM@mail.gmail.com> <20100512014651.GN73283@cicely7.cicely.de> <AANLkTinZqDH4jHeyk6WCccT6gSaQRTyMR7y0fr7h8d3W@mail.gmail.com>
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On Mon, May 17, 2010 at 10:54:17PM +0930, Matt Thyer wrote: > On 12 May 2010 11:16, Bernd Walter <ticso@cicely7.cicely.de> wrote: > > > > On Tue, May 11, 2010 at 10:15:13PM +0200, Alexander Best wrote: > > > i've posted a log here which is pretty self explanatory: > > > > > > http://pastebin.com/tn3NiDDW > > > > > [snip] > > > > > One of the typical problems users have is that they forget that > > adding a label takes one sector, so the labeled device is smaller. > > This is no problem if you create the filesystem on the labeled > > drive, but often enough people add the label after creating the > > filesystem. > > FreeBSD's utilities should be able to detect this situation and either > correct the filesystem size or refuse to apply the label. How can this work? glabel doesn't know anything about volume contents - it just writes a label-sector and offers the remaning storage as a new volume. Result: Refusing is impossible. Changing UFS filesystem size isn't an easy task and the last sector is already lost when filesystem comes into game. Result: Too late. I think the only reasonable thing to be done is that fsck can speak up by checking the volume size with the filesystems size _after_ glabel has overwritten the last sector. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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