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xfsprogs/mkfs: what's the relationship between max trans res and min log

To: xfs <xfs@xxxxxxxxxxx>, Dave Chinner <dchinner@xxxxxxxxxx>
Subject: xfsprogs/mkfs: what's the relationship between max trans res and min log size
From: Wang Sheng-Hui <shhuiw@xxxxxxxxxxx>
Date: Mon, 18 May 2015 14:33:06 +0800
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
Hi guys,


In maxtrres.c/max_trans_res, it calls xfs_log_calc_minimum_size to compute the
              maximum transaction reservation

But for xfs_log_calc_minimum_size, it's used to calculate the
              minimum valid log size


The naming max/minimum seems confusing.

Why are they named in such way? What's the relationship between max trans res
and minimun log size, (max trans res) <= (minimun log size)?


Any explanations are welcomed!


Thanks,
Sheng-Hui


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