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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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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