linux-ext4 - Re: [PATCH 3/7 v2] ext4: add physical block and status member into extent status tree

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Message-ID: <20130118094934.GA20442@gmail.com>
Date:	Fri, 18 Jan 2013 17:49:34 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, Jan kara <jack@...e.cz>,
	Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH 3/7 v2] ext4: add physical block and status member into
 extent status tree

On Wed, Jan 16, 2013 at 11:42:13PM -0500, Theodore Ts'o wrote:
> On Fri, Jan 11, 2013 at 06:53:43PM +0800, Zheng Liu wrote:
> >  struct extent_status {
> >  	struct rb_node rb_node;
> >  	ext4_lblk_t es_lblk;	/* first logical block extent covers */
> >  	ext4_lblk_t es_len;	/* length of extent in block */
> > +	ext4_fsblk_t es_pblk;	/* first physical block */
> > +	int es_status;		/* record the status of extent */
> >  };
> 
> Given that we only support 48 bits for the physical block number, and
> we only need two bits for es_status, one thing we could do to save
> memory is to stash the es_status bits in the top two bits of es_pblk.

Thanks for the comment.  In next version, es_status will be stashed into
es_pblk.

Regards,
                                                - Zheng
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