[SCSI] libosd: OSDv1 preliminary implementation

Implementation of the most basic OSD functionality and
infrastructure. Mainly Format, Create/Remove Partition,
Create/Remove Object, and read/write.

- Add Makefile and Kbuild to compile libosd.ko
- osd_initiator.c Implementation file for osd_initiator.h
  and osd_sec.h APIs
- osd_debug.h - Some kprintf macro definitions
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Reviewed-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/osd/Kbuild

+#
+# Kbuild for the OSD modules
+#
+# Copyright (C) 2008 Panasas Inc.  All rights reserved.
+#
+# Authors:
+#   Boaz Harrosh <bharrosh@panasas.com>
+#   Benny Halevy <bhalevy@panasas.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2
+#
+
+ifneq ($(OSD_INC),)
+# we are built out-of-tree Kconfigure everything as on
+
+CONFIG_SCSI_OSD_INITIATOR=m
+ccflags-y += -DCONFIG_SCSI_OSD_INITIATOR -DCONFIG_SCSI_OSD_INITIATOR_MODULE
+
+# Uncomment to turn debug on
+# ccflags-y += -DCONFIG_SCSI_OSD_DEBUG
+
+# if we are built out-of-tree and the hosting kernel has OSD headers
+# then "ccflags-y +=" will not pick the out-off-tree headers. Only by doing
+# this it will work. This might break in future kernels
+LINUXINCLUDE := -I$(OSD_INC) $(LINUXINCLUDE)
+
+endif
+
+# libosd.ko - osd-initiator library
+libosd-y := osd_initiator.o
+obj-$(CONFIG_SCSI_OSD_INITIATOR) += libosd.o

drivers/scsi/osd/Makefile

+#
+# Makefile for the OSD modules (out of tree)
+#
+# Copyright (C) 2008 Panasas Inc.  All rights reserved.
+#
+# Authors:
+#   Boaz Harrosh <bharrosh@panasas.com>
+#   Benny Halevy <bhalevy@panasas.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2
+#
+# This Makefile is used to call the kernel Makefile in case of an out-of-tree
+# build.
+# $KSRC should point to a Kernel source tree otherwise host's default is
+# used. (eg. /lib/modules/`uname -r`/build)
+
+# include path for out-of-tree Headers
+OSD_INC ?= `pwd`/../../../include
+
+# allow users to override these
+# e.g. to compile for a kernel that you aren't currently running
+KSRC ?= /lib/modules/$(shell uname -r)/build
+KBUILD_OUTPUT ?=
+ARCH ?=
+V ?= 0
+
+# this is the basic Kbuild out-of-tree invocation, with the M= option
+KBUILD_BASE = +$(MAKE) -C $(KSRC) M=`pwd` KBUILD_OUTPUT=$(KBUILD_OUTPUT) ARCH=$(ARCH) V=$(V)
+
+all: libosd
+
+libosd: ;
+	$(KBUILD_BASE) OSD_INC=$(OSD_INC) modules
+
+clean:
+	$(KBUILD_BASE) clean

drivers/scsi/osd/osd_debug.h

+/*
+ * osd_debug.h - Some kprintf macros
+ *
+ * Copyright (C) 2008 Panasas Inc.  All rights reserved.
+ *
+ * Authors:
+ *   Boaz Harrosh <bharrosh@panasas.com>
+ *   Benny Halevy <bhalevy@panasas.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ *
+ */
+#ifndef __OSD_DEBUG_H__
+#define __OSD_DEBUG_H__
+
+#define OSD_ERR(fmt, a...) printk(KERN_ERR "osd: " fmt, ##a)
+#define OSD_INFO(fmt, a...) printk(KERN_NOTICE "osd: " fmt, ##a)
+
+#ifdef CONFIG_SCSI_OSD_DEBUG
+#define OSD_DEBUG(fmt, a...) \
+	printk(KERN_NOTICE "osd @%s:%d: " fmt, __func__, __LINE__, ##a)
+#else
+#define OSD_DEBUG(fmt, a...) do {} while (0)
+#endif
+
+/* u64 has problems with printk this will cast it to unsigned long long */
+#define _LLU(x) (unsigned long long)(x)
+
+#endif /* ndef __OSD_DEBUG_H__ */