> All of the md code looks like it copies the buffer head, setting
> b_dev=b_rdev="real device" in the new bh and leaving b_dev==b_rdev="logical
> device" in the original bh. I'm assuming they do this for a reason, but
> it would be nice from a performance standpoint to just touch b_rdev and
> b_end_io and be done. Is there something I'm missing which necessitates the
> copy?
Oops...I take that back. In the md code for raid1, raid5 and multipath
I see copies, but not in lvm or linear.
Tim
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