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CONFIG_BLK_DEV_BSG: Block layer SG support v4 (EXPERIMENTAL)

General informations

The Linux kernel configuration item CONFIG_BLK_DEV_BSG has multiple definitions:

Block layer SG support v4 (EXPERIMENTAL) found in block/Kconfig

The configuration item CONFIG_BLK_DEV_BSG:

Help text

Saying Y here will enable generic SG (SCSI generic) v4 support for any block device.

Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 can handle complicated SCSI commands: tagged variable length cdbs with bidirectional data transfers and generic request/response protocols (e.g. Task Management Functions and SMP in Serial Attached SCSI).

If unsure, say N.

Block layer SG support v4 found in block/Kconfig

The configuration item CONFIG_BLK_DEV_BSG:

Help text

Saying Y here will enable generic SG (SCSI generic) v4 support for any block device.

Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 can handle complicated SCSI commands: tagged variable length cdbs with bidirectional data transfers and generic request/response protocols (e.g. Task Management Functions and SMP in Serial Attached SCSI).

This option is required by recent UDEV versions to properly access device serial numbers, etc.

If unsure, say Y.

Hardware

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