c66ac9db8d
LIO target is a full featured in-kernel target framework with the
following feature set:
High-performance, non-blocking, multithreaded architecture with SIMD
support.
Advanced SCSI feature set:
* Persistent Reservations (PRs)
* Asymmetric Logical Unit Assignment (ALUA)
* Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
* Full Error Recovery (ERL=0,1,2)
* Active/active task migration and session continuation (ERL=2)
* Thin LUN provisioning (UNMAP and WRITE_SAMExx)
Multiprotocol target plugins
Storage media independence:
* Virtualization of all storage media; transparent mapping of IO to LUNs
* No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
* Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.
Standards compliance:
* Full compliance with IETF (RFC 3720)
* Full implementation of SPC-4 PRs and ALUA
Significant code cleanups done by Christoph Hellwig.
[jejb: fix up for new block bdev exclusive interface. Minor fixes from
Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*******************************************************************************
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* Filename: target_core_scdb.c
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*
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* This file contains the generic target engine Split CDB related functions.
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*
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* Copyright (c) 2004-2005 PyX Technologies, Inc.
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* Copyright (c) 2005, 2006, 2007 SBE, Inc.
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* Copyright (c) 2007-2010 Rising Tide Systems
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* Copyright (c) 2008-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/net.h>
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#include <linux/string.h>
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#include <scsi/scsi.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_transport.h>
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#include "target_core_scdb.h"
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/* split_cdb_XX_6():
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*
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* 21-bit LBA w/ 8-bit SECTORS
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*/
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void split_cdb_XX_6(
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unsigned long long lba,
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u32 *sectors,
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unsigned char *cdb)
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{
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cdb[1] = (lba >> 16) & 0x1f;
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cdb[2] = (lba >> 8) & 0xff;
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cdb[3] = lba & 0xff;
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cdb[4] = *sectors & 0xff;
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}
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/* split_cdb_XX_10():
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*
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* 32-bit LBA w/ 16-bit SECTORS
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*/
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void split_cdb_XX_10(
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unsigned long long lba,
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u32 *sectors,
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unsigned char *cdb)
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{
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put_unaligned_be32(lba, &cdb[2]);
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put_unaligned_be16(*sectors, &cdb[7]);
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}
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/* split_cdb_XX_12():
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*
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* 32-bit LBA w/ 32-bit SECTORS
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*/
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void split_cdb_XX_12(
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unsigned long long lba,
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u32 *sectors,
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unsigned char *cdb)
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{
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put_unaligned_be32(lba, &cdb[2]);
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put_unaligned_be32(*sectors, &cdb[6]);
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}
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/* split_cdb_XX_16():
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*
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* 64-bit LBA w/ 32-bit SECTORS
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*/
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void split_cdb_XX_16(
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unsigned long long lba,
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u32 *sectors,
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unsigned char *cdb)
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{
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put_unaligned_be64(lba, &cdb[2]);
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put_unaligned_be32(*sectors, &cdb[10]);
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}
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/*
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* split_cdb_XX_32():
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*
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* 64-bit LBA w/ 32-bit SECTORS such as READ_32, WRITE_32 and emulated XDWRITEREAD_32
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*/
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void split_cdb_XX_32(
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unsigned long long lba,
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u32 *sectors,
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unsigned char *cdb)
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{
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put_unaligned_be64(lba, &cdb[12]);
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put_unaligned_be32(*sectors, &cdb[28]);
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}
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