[PATCH] jbd: jbd-debug and jbd2-debug should be writable.

[Yin, Kangkai]

Hi,

Re-send since seems my mail was dropped by vger, because of my wrong
envelope_from..

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I was trying to enable the jbd debug option, and found that jbd-debug
in debugfs is read-only, shouldn't that be writable?

Found in both .31 stable kernel and .32 one.

Thanks,
Kangkai