diff options
author | Nicholas Bellinger <nab@linux-iscsi.org> | 2010-12-17 11:11:26 -0800 |
---|---|---|
committer | James Bottomley <James.Bottomley@suse.de> | 2011-01-14 10:12:29 -0600 |
commit | c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 (patch) | |
tree | 71c6344688bf56ea6aaf18c586ab69ff4f077ade /drivers/target/target_core_scdb.c | |
parent | f4013c3879d1bbd9f3ab8351185decd049502368 (diff) |
[SCSI] target: Add LIO target core v4.0.0-rc6
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>
Diffstat (limited to 'drivers/target/target_core_scdb.c')
-rw-r--r-- | drivers/target/target_core_scdb.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/target/target_core_scdb.c b/drivers/target/target_core_scdb.c new file mode 100644 index 00000000000..dc6fed037ab --- /dev/null +++ b/drivers/target/target_core_scdb.c @@ -0,0 +1,105 @@ +/******************************************************************************* + * 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]); +} |