linux/drivers/scsi/device_handler/Kconfig

#
# SCSI Device Handler configuration
#

menuconfig SCSI_DH
	tristate "SCSI Device Handlers"
	depends on SCSI
	default n
	help
	  SCSI Device Handlers provide device specific support for
	  devices utilized in multipath configurations. Say Y here to
	  select support for specific hardware.
[SCSI] scsi_dh: add infrastructure for SCSI Device Handlers Some of the storage devices (that can be accessed through multiple paths), do need some special handling for 1. Activating the passive path of the storage access. 2. Decode and handle the special sense codes returned by the devices. 3. Handle the I/Os being sent to the passive path, especially during the device probe time. when accessed through multiple paths. As of today this special device handling is done at the dm-multipath layer using dm-handlers. That works well for (1); for (2) to be handled at dm layer, scsi sense information need to be exported from SCSI to dm-layer, which is not very attractive; (3) cannot be done at all at the dm layer. Device handler has been moved to SCSI mainly to handle (2) and (3) properly. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> 2008-05-01 21:49:46 +00:00			`#`
			`# SCSI Device Handler configuration`
			`#`

			`menuconfig SCSI_DH`
			`tristate "SCSI Device Handlers"`
			`depends on SCSI`
			`default n`
			`help`
			`SCSI Device Handlers provide device specific support for`
			`devices utilized in multipath configurations. Say Y here to`
			`select support for specific hardware.`