Ext3 Quick Shutdown

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Hi,
I'm working on a 2.4.20-8 kernel running on an ext3 file-system. I'm
in a situation  where the file-system needs to clean-up as soon as
possible upon the receipt of a particular NMI/Interrupt. Basically, I
need to do an fsync and inform the ext3 layer that the "clean" flag
must be turned on the file-system or something of that sort. Now,
there's a minimal amount of time remaining after the interrupt arrives
before the power is abruptly brought down. So, basically how do I make
the ext3 FS clean within such a duration?

-Thanks.

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