mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 09:14:19 +08:00
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>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*******************************************************************************
|
|
* Filename: target_core_scdb.c
|
|
*
|
|
* This file contains the generic target engine Split CDB related functions.
|
|
*
|
|
* Copyright (c) 2004-2005 PyX Technologies, Inc.
|
|
* Copyright (c) 2005, 2006, 2007 SBE, Inc.
|
|
* Copyright (c) 2007-2010 Rising Tide Systems
|
|
* Copyright (c) 2008-2010 Linux-iSCSI.org
|
|
*
|
|
* Nicholas A. Bellinger <nab@kernel.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <linux/net.h>
|
|
#include <linux/string.h>
|
|
#include <scsi/scsi.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_transport.h>
|
|
|
|
#include "target_core_scdb.h"
|
|
|
|
/* split_cdb_XX_6():
|
|
*
|
|
* 21-bit LBA w/ 8-bit SECTORS
|
|
*/
|
|
void split_cdb_XX_6(
|
|
unsigned long long lba,
|
|
u32 *sectors,
|
|
unsigned char *cdb)
|
|
{
|
|
cdb[1] = (lba >> 16) & 0x1f;
|
|
cdb[2] = (lba >> 8) & 0xff;
|
|
cdb[3] = lba & 0xff;
|
|
cdb[4] = *sectors & 0xff;
|
|
}
|
|
|
|
/* split_cdb_XX_10():
|
|
*
|
|
* 32-bit LBA w/ 16-bit SECTORS
|
|
*/
|
|
void split_cdb_XX_10(
|
|
unsigned long long lba,
|
|
u32 *sectors,
|
|
unsigned char *cdb)
|
|
{
|
|
put_unaligned_be32(lba, &cdb[2]);
|
|
put_unaligned_be16(*sectors, &cdb[7]);
|
|
}
|
|
|
|
/* split_cdb_XX_12():
|
|
*
|
|
* 32-bit LBA w/ 32-bit SECTORS
|
|
*/
|
|
void split_cdb_XX_12(
|
|
unsigned long long lba,
|
|
u32 *sectors,
|
|
unsigned char *cdb)
|
|
{
|
|
put_unaligned_be32(lba, &cdb[2]);
|
|
put_unaligned_be32(*sectors, &cdb[6]);
|
|
}
|
|
|
|
/* split_cdb_XX_16():
|
|
*
|
|
* 64-bit LBA w/ 32-bit SECTORS
|
|
*/
|
|
void split_cdb_XX_16(
|
|
unsigned long long lba,
|
|
u32 *sectors,
|
|
unsigned char *cdb)
|
|
{
|
|
put_unaligned_be64(lba, &cdb[2]);
|
|
put_unaligned_be32(*sectors, &cdb[10]);
|
|
}
|
|
|
|
/*
|
|
* split_cdb_XX_32():
|
|
*
|
|
* 64-bit LBA w/ 32-bit SECTORS such as READ_32, WRITE_32 and emulated XDWRITEREAD_32
|
|
*/
|
|
void split_cdb_XX_32(
|
|
unsigned long long lba,
|
|
u32 *sectors,
|
|
unsigned char *cdb)
|
|
{
|
|
put_unaligned_be64(lba, &cdb[12]);
|
|
put_unaligned_be32(*sectors, &cdb[28]);
|
|
}
|