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nvme: make SG_IO support optional

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Translation SCSI commands to NVMe commands is rather pointless in general
as applications must not expext to be able to use SCSI commands on a
generic block device.

Make the huge translation layer optional and hope no one will ever enable
it in the future.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-12-24 15:27:02 +01:00 committed by Jens Axboe
parent bfd8947194
commit 4490733250
3 changed files with 15 additions and 1 deletions
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11
drivers/nvme/host/Kconfig
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@ -8,3 +8,14 @@ config BLK_DEV_NVME
To compile this driver as a module, choose M here: the
module will be called nvme.
config BLK_DEV_NVME_SCSI
bool "SCSI emulation for NVMe device nodes"
depends on BLK_DEV_NVME
---help---
This adds support for the SG_IO ioctl on the NVMe character
and block devices nodes, as well a a translation for a small
number of selected SCSI commands to NVMe commands to the NVMe
driver. If you don't know what this means you probably want
to say N here, and if you know what it means you probably
want to say N as well.

3
drivers/nvme/host/Makefile
View File

@ -1,4 +1,5 @@
obj-$(CONFIG_BLK_DEV_NVME) += nvme.o
nvme-y += core.o pci.o scsi.o lightnvm.o
nvme-y += core.o pci.o lightnvm.o
nvme-$(CONFIG_BLK_DEV_NVME_SCSI) += scsi.o

2
drivers/nvme/host/core.c
View File

@ -467,10 +467,12 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
case NVME_IOCTL_SUBMIT_IO:
return nvme_submit_io(ns, (void __user *)arg);
#ifdef CONFIG_BLK_DEV_NVME_SCSI
case SG_GET_VERSION_NUM:
return nvme_sg_get_version_num((void __user *)arg);
case SG_IO:
return nvme_sg_io(ns, (void __user *)arg);
#endif
default:
return -ENOTTY;
}