Revert "nvme: add support for the Write Zeroes command"

This reverts commit 6d31e3ba232ea22458b2f36b6d3f2f9f11bf3fa4.

This causes bootup problems for me both on my laptop and my desktop.
What they have in common is that they have NVMe disks with dm-crypt, but
it's not the same controller, so it's not controller-specific.

Jens does not see it on his machine (also NVMe), so it's presumably
something that triggers just on bootup. Possibly related to dm-crypt
and the fact that I mark my luks volume with "allow-discards" in
/etc/crypttab.

It's 100% repeatable for me, which made it fairly straightforward to
bisect the problem to this commit. Small mercies.

So we don't know what the reason is yet, but the revert is needed to get
things going again.

Acked-by: Jens Axboe <[e-mail]>
Cc: Chaitanya Kulkarni <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/nvme/host/core.c

···
 	return BLK_MQ_RQ_QUEUE_OK;
 }
 
-static inline void nvme_setup_write_zeroes(struct nvme_ns *ns,
-		struct request *req, struct nvme_command *cmnd)
-{
-	struct nvme_write_zeroes_cmd *write_zeroes = &cmnd->write_zeroes;
-
-	memset(cmnd, 0, sizeof(*cmnd));
-	write_zeroes->opcode = nvme_cmd_write_zeroes;
-	write_zeroes->nsid = cpu_to_le32(ns->ns_id);
-	write_zeroes->slba =
-		cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
-	write_zeroes->length =
-		cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
-	write_zeroes->control = 0;
-}
-
 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
 		struct nvme_command *cmnd)
 {
···
 		nvme_setup_flush(ns, cmd);
 	else if (req_op(req) == REQ_OP_DISCARD)
 		ret = nvme_setup_discard(ns, req, cmd);
-	else if (req_op(req) == REQ_OP_WRITE_ZEROES)
-		nvme_setup_write_zeroes(ns, req, cmd);
 	else
 		nvme_setup_rw(ns, req, cmd);
 
···
 
 	if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
 		nvme_config_discard(ns);
-	if (ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES)
-		blk_queue_max_write_zeroes_sectors(ns->queue,
-				((u32)(USHRT_MAX + 1) * bs) >> 9);
-
 	blk_mq_unfreeze_queue(disk->queue);
 }