Keith Busch 08095e7078 NVMe: Create discard zero quirk white list ... The NVMe specification does not require discarded blocks return zeroes on read, but provides that behavior as a possibility. Some applications more efficiently use an SSD if reads on discarded blocks were deterministically zero, based on the "discard_zeroes_data" queue attribute. There is no specification defined way to determine device behavior on discarded blocks, so the driver always left the queue setting disabled. We can only know behavior based on individual device models, so this patch adds a flag to the NVMe "quirk" list that vendors may set if they know their controller works that way. The patch also sets the new flag for one such known device. Signed-off-by: Keith Busch <keith.busch@intel.com> Suggested-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Jens Axboe <axboe@fb.com>		2016-03-08 08:32:40 -07:00
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host	NVMe: Create discard zero quirk white list	2016-03-08 08:32:40 -07:00
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