Uberblock location

[felipemonteiro.carvalho at gmail.com]

hello,

Where can I find the source code that you are mentioning? I am reading the source in https://github.com/zfsonlinux/zfs?files=1 but it is very large and so far I couldnt pinpoint where it finds the uberblock.

Also the mention of bootblock confuses me since ita for booting while I am working in a general case, not necessarely involving boot.

thanks,

Felipe

Enviada do meu iPhone

> Em 12/06/2015, às 18:01, Julian Elischer <julian at freebsd.org> escreveu:
> 
>> On 6/12/15 9:49 PM, Felipe Monteiro de Carvalho wrote:
>> Hello,
>> 
>> I am writing a program to read ZFS partitions, and although I already
>> read a lot of documentation, there is 1 problem which is blocking me:
>> How does the driver find the uberblock?
>> 
>> I know, I can just get any test volume, find the ZFS uberblock and in
>> my case it is positioned in 0x20C00 and there are lots and lots of
>> copies (older versions?) of it.
>> 
>> But there is no guarantee that it doesn't just happen to be in this
>> position in my image and in another version it would be elsewhere, so
>> I need the algorithm utilized to find it.
> 
> I presume you have looked at the zfs reading library in the bootblocks?
> 
>> 
>> Any ideas?
>> 
>> thanks,
>