Re: Reserved first sector for UFS

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 01/07/2011 12:23 PM, Grégoire Sutre wrote:
> On 01/07/2011 11:30, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>> On 01/07/2011 10:35 AM, Grégoire Sutre wrote:
>>> Isn't the first sector reserved for the boot block in UFS?
>>>
>> Depends on OS:
>>
>> /* The blocks on which the superblock can be found.  */
>> static int sblocklist[] = { 128, 16, 0, 512, -1 };
>
> Do you know of any OS that would put the superblock in sector 0?
> I  googled a bit, but I couldn't find examples where UFS would
> not start with a boot sector (afaics, it usually starts with a
> bootblock area of at least 8KiB -- with OS-specific data in it,
> e.g. a disklabel).
>
According to *BSD http://fxr.watson.org/fxr/source/ufs/ffs/fs.h:

*/"* Depending on the architecture and the media, the superblock may/*
*/* reside in any one of four places. For tiny media where every block /*
*/* counts, it is placed at the very front of the partition. Historically,/*
*/* UFS1 placed it 8K from the front to leave room for the disk label and/*
*/* a small bootstrap. For UFS2 it got moved to 64K from the front to leave/*
*/* room for the disk label and a bigger bootstrap, and for really piggy/*
*/* systems we check at 256K from the front if the first three fail/*"

> Grégoire
>
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-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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