Re: [RFC] ext3 documentation (lack of)

[Ryan Cumming <ryan@spitfire.gotdns.org>]

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On Tuesday 17 August 2004 17:59, you wrote:
> +commit=nrsec	(*)	Ext3 can be told to write all its data and metadata
> +			every 'nrsec' seconds. The default value is 5 seconds.
> +			This means that if you lose your power, you will lose,
> +			as much, the latest 5 seconds of work. This default
> +			value (or any low value) will hurt performance, but
> +			it's good for data-safety. Setting it to 0 disables it.
> +			Disabling it or setting it to very large values will
> +			improve performance,

Setting commit to zero doesn't seem to disable it, judging from my local 
2.6.8.1-mm1 source.

super.c has:
case Opt_commit:
   if (match_int(&args[0], &option))
      return 0;
   if (option < 0)
      return 0;
   if (option == 0)
      option = JBD_DEFAULT_MAX_COMMIT_AGE;
   sbi->s_commit_interval = HZ * option;
   break;

Where JBD_DEFAULT_COMMIT_AGE is defined to 5 in include/linux/jbd.h. So it 
seems that setting it to zero will just set it to the default commit interval 
of 5 seconds. Am I missing something?

-Ryan

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