nvme: implement the DEAC bit for the Write Zeroes command

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While the specification allows devices to either deallocate data
or to actually write zeroes on any Write Zeroes command, many SSDs
only do the sensible thing and deallocate data when the DEAC bit
is specific.  Set it when it is supported and the caller doesn't
explicitly opt out of deallocation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

...

This commit is contained in:

Christoph Hellwig 2022-10-30 16:50:15 +01:00

parent e4fbcf32c8

commit 1b96f862ec

3 changed files with 14 additions and 1 deletions

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13

drivers/nvme/host/core.c

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1

drivers/nvme/host/nvme.h

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1

include/linux/nvme.h

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