linux-kernel - Re: New filesystem for Linux

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Date:	Sat, 4 Nov 2006 19:52:18 +0100 (CET)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	dean gaudet <dean@...tic.org>
Cc:	Jörn Engel <joern@...nheim.fh-wedel.de>,
	linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

>> If it overflows, it increases crash count instead. So really you have 2^47
>> transactions or 65536 crashes and 2^31 transactions between each crash.
>
> it seems to me that you only need to be able to represent a range of the
> most recent 65536 crashes... and could have an online process which goes
> about "refreshing" old objects to move them forward to the most recent
> crash state.  as long as you know the minimm on-disk crash count you can
> use it as an offset.

After 65536 crashes you have to run spadfsck --reset-crash-counts. Maybe I 
add that functionality to kernel driver too, so that it will be formally 
corect.

Mikulas

> -dean
>
> p.s. i could see a network device with spotty connectivity causing a large
> bump in crash count in a short period of time.
>
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