Re: Write same w/o unmap bit

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On Tue, Jan 15, 2013 at 12:26 PM, Nicholas A. Bellinger
<nab@xxxxxxxxxxxxxxx> wrote:
> This statement is incorrect.  The WRITE_SAME w/o UNMAP emulation that
> went into v3.8-rc1 here:
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=f6970ad31d42fceb38b5595cbad093a4d0bfcc43
>
> is hardware agnostic, and has no dependency on underlying drive support
> for UNMAP (eg: block discard).  This is because the logic simply
> translates WRITE_SAME w/o UNMAP operations into struct bio WRITEs for a
> single received block.

Sorry, my mistake!  I didn't see that commit go in, and of course
given that code my previous statement is completely wrong.

 - R.
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