Thin provisioning fixes (take 3)

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Changes since last kit:

 - Patch 1 (block): Wire up an ioctl that reports whether the
   block device zeroes after discard

 - Patch 2 (sd): Tweak max_discard_sectors reporting

 - Patch 3 (scsi, new): Retry temporary TP write errors

 - Patch 4 (libata): No change

 - Patch 5 (libata): Switch to a bytes-in, bytes-out convention
   for ata_set_lba_range_entries() to make things more clear

I think we need a bit R&D wrt. discard coalescing and I doubt
we'll have that ready for the merge window.  So I suggest we
stick with the current loop-over-max-discard-sectors approach for
2.6.32.

-- 
Martin K. Petersen      Oracle Linux Engineering


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