JFFS2 - how does the new page allocated?

I'm currently analyzing the structure of JFFS2, for research reason. I have a simple question,

When JFFS2 allocates a new page to store the newly entering data, how does it select the new page? Does it allocate a new block for each new page request, or does it intelligently reuse the dirty marked page first to be more space efficient? I would like to get some hints on how JFFS2 provisions pages and blocks..

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title:Member of the technical staff
tel;work:+82.2.2194.7562
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I recommend you start by reading http://david.woodhou.se/jffs2.pdf

Then you should be able to ask questions which make slightly more sense to me, and stand a better chance of getting a coherent answer :)

dwmw2