libata: switch to block layer tagging

Hi,

This patchset switches libata to block layer tagging. It gets rid of yet
another O(N) command loop.

 block/blk-tag.c           |   99 +++++++++++++++++++++++++++-----------
 drivers/ata/libata-core.c |   94 ++++++++++--------------------------
 drivers/ata/libata-scsi.c |   23 ++++++++
 drivers/ata/libata.h      |   19 ++++++-
 include/linux/blkdev.h    |    3 +
 include/linux/libata.h    |    1 
 6 files changed, 139 insertions(+), 100 deletions(-)

-- 
Jens Axboe

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