linux-kernel - Re: Re: [PATCH] btrfs: Simplify offset calculation method for ctree.h

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Message-ID: <9bd6b5360912172259x17ee93d6y631ab52988f8965a@mail.gmail.com>
Date:	Fri, 18 Dec 2009 14:59:17 +0800
From:	sniper <s3c24xx@...il.com>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH] btrfs: Simplify offset calculation method for ctree.h

2009/12/18 Zhaolei <zhaolei@...fujitsu.com>:
> sniper wrote:
>> No, many pointers in btrfs function arguments are not pointing to an
>> absolute address, but relative to the start address of extent.
>> Take following function as example, argument inode_item is an offset
>> value to the beginning of leaf. So we can't reach its member with
>> &inode_item->xxx
>
> Notice that we are not reach its member, we are getting pointer of its
> member with &inode_item->mtime.
> This operation have same effect as old one.

right!
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