linux-kernel - [PATCH 7/7] [Target_Core_Mod/ConfigFS]: Add hw_block_size and block

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Date:	Fri, 20 Feb 2009 00:06:39 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Cc:	Douglas Gilbert <dgilbert@...erlog.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Matthew Wilcox <matthew@....cx>,
	Alan Stern <stern@...land.harvard.edu>,
	Mike Christie <michaelc@...wisc.edu>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 7/7] [Target_Core_Mod/ConfigFS]: Add hw_block_size and
	block_size configfs attributes

>>From 78b6d56c09bf1305e9ea532e734b885d0fa60b5d Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@...ux-iscsi.org>
Date: Thu, 19 Feb 2009 19:45:37 -0800
Subject: [PATCH 7/7] [Target_Core_Mod/ConfigFS]: Add hw_block_size and block_size configfs attributes

This patch adds the hw_block_size and block_size to /sys/kernel/config/target/core/$HBA/$DEV/attrib.
It allows block_size to be changed for IBLOCK, FILEIO and RAMDISK Target_Core_Mod/ConfigFS
storage objects to 4096, 2048, 1024 or 512 byte sector sizes, but currently requires that there be
*NO* active exports of said storage object to a active $FABRIC_MOD in order to change block_size.

By default, both hw_block_size and block_size are set to 512 bytes from IBLOCK, FILEIO and RAMDISK
subsystem plugins.  Note that for Target_Core_Mod/pSCSI storage objects, block_size is not allowed
to be changed (because we are doing passthrough into physical hardware registerd with Linux/SCSI)

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/lio-core/target_core_configfs.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/lio-core/target_core_configfs.c b/drivers/lio-core/target_core_configfs.c
index 46324a6..bcbd2cf 100644
--- a/drivers/lio-core/target_core_configfs.c
+++ b/drivers/lio-core/target_core_configfs.c
@@ -469,6 +469,12 @@ SE_DEV_ATTR(status_thread, S_IRUGO | S_IWUSR);
 DEF_DEV_ATTRIB(status_thread_tur);
 SE_DEV_ATTR(status_thread_tur, S_IRUGO | S_IWUSR);
 
+DEF_DEV_ATTRIB_RO(hw_block_size);
+SE_DEV_ATTR_RO(hw_block_size);
+
+DEF_DEV_ATTRIB(block_size);
+SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);
+
 DEF_DEV_ATTRIB_RO(hw_max_sectors);
 SE_DEV_ATTR_RO(hw_max_sectors);
 
@@ -489,6 +495,8 @@ CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib_s, da_group);
 static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
 	&target_core_dev_attrib_status_thread.attr,
 	&target_core_dev_attrib_status_thread_tur.attr,
+	&target_core_dev_attrib_hw_block_size.attr,
+	&target_core_dev_attrib_block_size.attr,
 	&target_core_dev_attrib_hw_max_sectors.attr,
 	&target_core_dev_attrib_max_sectors.attr,
 	&target_core_dev_attrib_hw_queue_depth.attr,
-- 
1.5.4.1



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