pdflush -> noflushd related question

[Michael Buesch (fsdeveloper@yahoo.de)]

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Hi.

I want to fix the userspace noflushd daemon to run on 2.5 kernels,
but it seems to get *very* tricky, because bdflush, kupdated have been
replaced by pdflush.

I've grepped through the lkml-archives and I found a post from you, Andrew,
that sayed:

[SNIP]
Subject: [patch] replace kupdate and bdflush with pdflush

- - use a timer to kick off a pdflush thread every five seconds
  to run the kupdate code. 

- - wakeup_bdflush() kicks off a pdflush thread to run the current
  bdflush function.

There's some loss of functionality here - the ability to tune
the writeback periods.  The numbers are hardwired at present.
But the intent is that buffer-based writeback disappears
altogether.  New mechanisms for tuning the writeback will
need to be introduced.
[SNIP]


Yea, but it seems, that I need exactly this lost functionality. :)
noflushd, on 2.4 kernels, prevents the disks to spin up by spinning
them down an stopping the kupdated daemon through putting
the update-interval to 0 via syscall bdflush().
That's the code to do so:
bdflush(2 + (1 << 3) + 1, interval);

So, how to set the interval, or better sayed, how to _stop_
buffer flushing in 2.5?
Has this lost functionality already been re-implemented?
Are there new syscalls?

Thanks for your help.

- -- 
Regards Michael Büsch
http://www.8ung.at/tuxsoft
 18:29:24 up  4:01,  2 users,  load average: 1.11, 1.09, 1.05

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