linux-kernel - [patch] minix zmap block counts calculation fix

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Message-ID: <53DEE61C.8060202@fc-cn.com>
Date:	Mon, 04 Aug 2014 09:47:08 +0800
From:	Qi Yong <qiyong@...cn.com>
To:	akpm@...ux-foundation.org, jwboyer@...hat.com
CC:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [patch] minix zmap block counts calculation fix

Hello,

The original Linus' minix zmap blocks calculation was correct, in the
formula of: sbi->s_nzones - sbi->s_firstdatazone + 1. It is (sp->s_zones
- (sp->s_firstdatazone - 1) in the minix3 source code.

But a later patch (fs/minix: Verify bitmap block counts before mounting)
has changed it unfortunately as:
  sbi->s_nzones - (sbi->s_firstdatazone + 1).
This would show free blocks one block less than the real when the total
data blocks are in "full zmap blocks plus one".

commit 016e8d44bc06dd3322f26712bdd3f3a6973592d0
Author: Josh Boyer <jwboyer@...hat.com>
Date:   Fri Aug 19 14:50:26 2011 -0400

This patch corrects that zmap blocks calculation and tidy a printk
message while at it.

Signed-off-by: Qi Yong <qiyong@...cn.com>

-- 
Qi Yong

View attachment "mfs-zmap_blocks-fix.patch" of type "text/plain" (1255 bytes)