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14150a6bbe
Having all the unmap payload parsing in the backed is a bit ugly, but until more drivers support it and we can find a good interface for all of them that seems the way to go. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
582 lines
16 KiB
C
582 lines
16 KiB
C
/*
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* SCSI Block Commands (SBC) parsing and emulation.
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*
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* Copyright (c) 2002, 2003, 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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ratelimit.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_fabric.h>
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#include "target_core_internal.h"
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#include "target_core_ua.h"
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static int sbc_emulate_readcapacity(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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unsigned char *buf;
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unsigned long long blocks_long = dev->transport->get_blocks(dev);
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u32 blocks;
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if (blocks_long >= 0x00000000ffffffff)
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blocks = 0xffffffff;
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else
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blocks = (u32)blocks_long;
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buf = transport_kmap_data_sg(cmd);
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buf[0] = (blocks >> 24) & 0xff;
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buf[1] = (blocks >> 16) & 0xff;
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buf[2] = (blocks >> 8) & 0xff;
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buf[3] = blocks & 0xff;
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buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
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buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
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buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
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buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
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transport_kunmap_data_sg(cmd);
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target_complete_cmd(cmd, GOOD);
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return 0;
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}
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static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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unsigned char *buf;
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unsigned long long blocks = dev->transport->get_blocks(dev);
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buf = transport_kmap_data_sg(cmd);
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buf[0] = (blocks >> 56) & 0xff;
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buf[1] = (blocks >> 48) & 0xff;
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buf[2] = (blocks >> 40) & 0xff;
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buf[3] = (blocks >> 32) & 0xff;
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buf[4] = (blocks >> 24) & 0xff;
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buf[5] = (blocks >> 16) & 0xff;
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buf[6] = (blocks >> 8) & 0xff;
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buf[7] = blocks & 0xff;
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buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
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buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
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buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
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buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
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/*
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* Set Thin Provisioning Enable bit following sbc3r22 in section
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* READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
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*/
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if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
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buf[14] = 0x80;
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transport_kunmap_data_sg(cmd);
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target_complete_cmd(cmd, GOOD);
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return 0;
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}
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int spc_get_write_same_sectors(struct se_cmd *cmd)
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{
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u32 num_blocks;
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if (cmd->t_task_cdb[0] == WRITE_SAME)
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num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
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else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
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num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
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else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
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num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
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/*
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* Use the explicit range when non zero is supplied, otherwise calculate
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* the remaining range based on ->get_blocks() - starting LBA.
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*/
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if (num_blocks)
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return num_blocks;
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return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
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cmd->t_task_lba + 1;
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}
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EXPORT_SYMBOL(spc_get_write_same_sectors);
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static int sbc_emulate_verify(struct se_cmd *cmd)
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{
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target_complete_cmd(cmd, GOOD);
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return 0;
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}
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static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
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{
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return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors;
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}
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static int sbc_check_valid_sectors(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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unsigned long long end_lba;
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u32 sectors;
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sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size;
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end_lba = dev->transport->get_blocks(dev) + 1;
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if (cmd->t_task_lba + sectors > end_lba) {
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pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
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cmd->t_task_lba, sectors, end_lba);
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return -EINVAL;
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}
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return 0;
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}
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static inline u32 transport_get_sectors_6(unsigned char *cdb)
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{
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/*
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* Use 8-bit sector value. SBC-3 says:
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*
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* A TRANSFER LENGTH field set to zero specifies that 256
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* logical blocks shall be written. Any other value
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* specifies the number of logical blocks that shall be
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* written.
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*/
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return cdb[4] ? : 256;
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}
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static inline u32 transport_get_sectors_10(unsigned char *cdb)
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{
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return (u32)(cdb[7] << 8) + cdb[8];
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}
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static inline u32 transport_get_sectors_12(unsigned char *cdb)
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{
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return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
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}
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static inline u32 transport_get_sectors_16(unsigned char *cdb)
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{
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return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
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(cdb[12] << 8) + cdb[13];
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}
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/*
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* Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
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*/
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static inline u32 transport_get_sectors_32(unsigned char *cdb)
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{
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return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
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(cdb[30] << 8) + cdb[31];
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}
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static inline u32 transport_lba_21(unsigned char *cdb)
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{
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return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
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}
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static inline u32 transport_lba_32(unsigned char *cdb)
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{
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return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
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}
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static inline unsigned long long transport_lba_64(unsigned char *cdb)
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{
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unsigned int __v1, __v2;
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__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
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__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
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return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
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}
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/*
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* For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
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*/
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static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
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{
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unsigned int __v1, __v2;
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__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
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__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
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return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
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}
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static int sbc_write_same_supported(struct se_device *dev,
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unsigned char *flags)
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{
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if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
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pr_err("WRITE_SAME PBDATA and LBDATA"
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" bits not supported for Block Discard"
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" Emulation\n");
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return -ENOSYS;
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}
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/*
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* Currently for the emulated case we only accept
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* tpws with the UNMAP=1 bit set.
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*/
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if (!(flags[0] & 0x08)) {
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pr_err("WRITE_SAME w/o UNMAP bit not"
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" supported for Block Discard Emulation\n");
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return -ENOSYS;
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}
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return 0;
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}
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static void xdreadwrite_callback(struct se_cmd *cmd)
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{
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unsigned char *buf, *addr;
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struct scatterlist *sg;
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unsigned int offset;
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int i;
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int count;
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/*
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* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
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*
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* 1) read the specified logical block(s);
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* 2) transfer logical blocks from the data-out buffer;
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* 3) XOR the logical blocks transferred from the data-out buffer with
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* the logical blocks read, storing the resulting XOR data in a buffer;
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* 4) if the DISABLE WRITE bit is set to zero, then write the logical
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* blocks transferred from the data-out buffer; and
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* 5) transfer the resulting XOR data to the data-in buffer.
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*/
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buf = kmalloc(cmd->data_length, GFP_KERNEL);
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if (!buf) {
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pr_err("Unable to allocate xor_callback buf\n");
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return;
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}
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/*
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* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
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* into the locally allocated *buf
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*/
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sg_copy_to_buffer(cmd->t_data_sg,
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cmd->t_data_nents,
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buf,
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cmd->data_length);
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/*
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* Now perform the XOR against the BIDI read memory located at
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* cmd->t_mem_bidi_list
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*/
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offset = 0;
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for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
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addr = kmap_atomic(sg_page(sg));
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if (!addr)
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goto out;
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for (i = 0; i < sg->length; i++)
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*(addr + sg->offset + i) ^= *(buf + offset + i);
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offset += sg->length;
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kunmap_atomic(addr);
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}
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out:
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kfree(buf);
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}
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int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
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{
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struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
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struct se_device *dev = cmd->se_dev;
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unsigned char *cdb = cmd->t_task_cdb;
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unsigned int size;
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u32 sectors = 0;
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int ret;
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switch (cdb[0]) {
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case READ_6:
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sectors = transport_get_sectors_6(cdb);
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cmd->t_task_lba = transport_lba_21(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case READ_10:
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sectors = transport_get_sectors_10(cdb);
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cmd->t_task_lba = transport_lba_32(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case READ_12:
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sectors = transport_get_sectors_12(cdb);
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cmd->t_task_lba = transport_lba_32(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case READ_16:
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sectors = transport_get_sectors_16(cdb);
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cmd->t_task_lba = transport_lba_64(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case WRITE_6:
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sectors = transport_get_sectors_6(cdb);
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cmd->t_task_lba = transport_lba_21(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case WRITE_10:
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case WRITE_VERIFY:
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sectors = transport_get_sectors_10(cdb);
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cmd->t_task_lba = transport_lba_32(cdb);
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if (cdb[1] & 0x8)
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cmd->se_cmd_flags |= SCF_FUA;
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case WRITE_12:
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sectors = transport_get_sectors_12(cdb);
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cmd->t_task_lba = transport_lba_32(cdb);
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if (cdb[1] & 0x8)
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cmd->se_cmd_flags |= SCF_FUA;
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case WRITE_16:
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sectors = transport_get_sectors_16(cdb);
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cmd->t_task_lba = transport_lba_64(cdb);
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if (cdb[1] & 0x8)
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cmd->se_cmd_flags |= SCF_FUA;
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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cmd->execute_cmd = ops->execute_rw;
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break;
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case XDWRITEREAD_10:
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if ((cmd->data_direction != DMA_TO_DEVICE) ||
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!(cmd->se_cmd_flags & SCF_BIDI))
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goto out_invalid_cdb_field;
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sectors = transport_get_sectors_10(cdb);
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cmd->t_task_lba = transport_lba_32(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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/*
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* Setup BIDI XOR callback to be run after I/O completion.
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*/
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cmd->execute_cmd = ops->execute_rw;
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cmd->transport_complete_callback = &xdreadwrite_callback;
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if (cdb[1] & 0x8)
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cmd->se_cmd_flags |= SCF_FUA;
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break;
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case VARIABLE_LENGTH_CMD:
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{
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u16 service_action = get_unaligned_be16(&cdb[8]);
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switch (service_action) {
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case XDWRITEREAD_32:
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sectors = transport_get_sectors_32(cdb);
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/*
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* Use WRITE_32 and READ_32 opcodes for the emulated
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* XDWRITE_READ_32 logic.
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*/
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cmd->t_task_lba = transport_lba_64_ext(cdb);
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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/*
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* Setup BIDI XOR callback to be run during after I/O
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* completion.
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*/
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cmd->execute_cmd = ops->execute_rw;
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cmd->transport_complete_callback = &xdreadwrite_callback;
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if (cdb[1] & 0x8)
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cmd->se_cmd_flags |= SCF_FUA;
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break;
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case WRITE_SAME_32:
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if (!ops->execute_write_same)
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goto out_unsupported_cdb;
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sectors = transport_get_sectors_32(cdb);
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if (!sectors) {
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pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
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" supported\n");
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goto out_invalid_cdb_field;
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}
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size = sbc_get_size(cmd, 1);
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cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
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if (sbc_write_same_supported(dev, &cdb[10]) < 0)
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goto out_unsupported_cdb;
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cmd->execute_cmd = ops->execute_write_same;
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break;
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default:
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pr_err("VARIABLE_LENGTH_CMD service action"
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" 0x%04x not supported\n", service_action);
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goto out_unsupported_cdb;
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}
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break;
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}
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case READ_CAPACITY:
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size = READ_CAP_LEN;
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cmd->execute_cmd = sbc_emulate_readcapacity;
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break;
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case SERVICE_ACTION_IN:
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switch (cmd->t_task_cdb[1] & 0x1f) {
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case SAI_READ_CAPACITY_16:
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cmd->execute_cmd = sbc_emulate_readcapacity_16;
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break;
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default:
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pr_err("Unsupported SA: 0x%02x\n",
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cmd->t_task_cdb[1] & 0x1f);
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goto out_invalid_cdb_field;
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}
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size = (cdb[10] << 24) | (cdb[11] << 16) |
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(cdb[12] << 8) | cdb[13];
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break;
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case SYNCHRONIZE_CACHE:
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case SYNCHRONIZE_CACHE_16:
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if (!ops->execute_sync_cache)
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goto out_unsupported_cdb;
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|
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/*
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* Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
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*/
|
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if (cdb[0] == SYNCHRONIZE_CACHE) {
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sectors = transport_get_sectors_10(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
} else {
|
|
sectors = transport_get_sectors_16(cdb);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
}
|
|
|
|
size = sbc_get_size(cmd, sectors);
|
|
|
|
/*
|
|
* Check to ensure that LBA + Range does not exceed past end of
|
|
* device for IBLOCK and FILEIO ->do_sync_cache() backend calls
|
|
*/
|
|
if (cmd->t_task_lba || sectors) {
|
|
if (sbc_check_valid_sectors(cmd) < 0)
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
cmd->execute_cmd = ops->execute_sync_cache;
|
|
break;
|
|
case UNMAP:
|
|
if (!ops->execute_unmap)
|
|
goto out_unsupported_cdb;
|
|
|
|
size = get_unaligned_be16(&cdb[7]);
|
|
cmd->execute_cmd = ops->execute_unmap;
|
|
break;
|
|
case WRITE_SAME_16:
|
|
if (!ops->execute_write_same)
|
|
goto out_unsupported_cdb;
|
|
|
|
sectors = transport_get_sectors_16(cdb);
|
|
if (!sectors) {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
size = sbc_get_size(cmd, 1);
|
|
cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
|
|
|
|
if (sbc_write_same_supported(dev, &cdb[1]) < 0)
|
|
goto out_unsupported_cdb;
|
|
cmd->execute_cmd = ops->execute_write_same;
|
|
break;
|
|
case WRITE_SAME:
|
|
if (!ops->execute_write_same)
|
|
goto out_unsupported_cdb;
|
|
|
|
sectors = transport_get_sectors_10(cdb);
|
|
if (!sectors) {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
size = sbc_get_size(cmd, 1);
|
|
cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
|
|
|
|
/*
|
|
* Follow sbcr26 with WRITE_SAME (10) and check for the existence
|
|
* of byte 1 bit 3 UNMAP instead of original reserved field
|
|
*/
|
|
if (sbc_write_same_supported(dev, &cdb[1]) < 0)
|
|
goto out_unsupported_cdb;
|
|
cmd->execute_cmd = ops->execute_write_same;
|
|
break;
|
|
case VERIFY:
|
|
size = 0;
|
|
cmd->execute_cmd = sbc_emulate_verify;
|
|
break;
|
|
default:
|
|
ret = spc_parse_cdb(cmd, &size);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* reject any command that we don't have a handler for */
|
|
if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
|
|
goto out_unsupported_cdb;
|
|
|
|
if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
|
|
unsigned long long end_lba;
|
|
|
|
if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
|
|
printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
|
|
" big sectors %u exceeds fabric_max_sectors:"
|
|
" %u\n", cdb[0], sectors,
|
|
su_dev->se_dev_attrib.fabric_max_sectors);
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
|
|
printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
|
|
" big sectors %u exceeds backend hw_max_sectors:"
|
|
" %u\n", cdb[0], sectors,
|
|
su_dev->se_dev_attrib.hw_max_sectors);
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
end_lba = dev->transport->get_blocks(dev) + 1;
|
|
if (cmd->t_task_lba + sectors > end_lba) {
|
|
pr_err("cmd exceeds last lba %llu "
|
|
"(lba %llu, sectors %u)\n",
|
|
end_lba, cmd->t_task_lba, sectors);
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
size = sbc_get_size(cmd, sectors);
|
|
}
|
|
|
|
ret = target_cmd_size_check(cmd, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
|
|
out_unsupported_cdb:
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
return -EINVAL;
|
|
out_invalid_cdb_field:
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(sbc_parse_cdb);
|