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.
- Ted
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