ext3 linux kernel implementation

I just read http://olstrans.sourceforge.ne开发者_高级运维t/release/OLS2000-ext3/OLS2000-ext3.html which is an excellent review of the design issues used when journaling was implemented in ext3. Could someone point me towards the section of the linux kernel code where ext3 journaling is implemented?

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You can use lxr to search the linux code.

ext3 and journaling interface code is here and JDB code is here