target: Fix WRITE_SAME_[16,32] number of blocks=0 case
This patch fixes the handling of WRITE_SAME_[16,32] emulation where a WRITE_SAME_* CDB with number of blocks=0 was being rejected by SCSI expected data transfer length overflow checking in target core. It changes both CDB cases in transport_generic_cmd_sequencer() to use dev->se_sub_dev->se_dev_attrib.block_size to match what sg_write_same is sending us with --num=0. It also fixes target_emulate_write_same() to properly determine the num_blocks with --num=0 case to determine the remaining range for dev->transport->do_discard(). Reported-by: Chris Greiveldinger <chris.greiveldinger@rnanetworks.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
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@ -1008,18 +1008,30 @@ target_emulate_unmap(struct se_task *task)
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* Note this is not used for TCM/pSCSI passthrough
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* Note this is not used for TCM/pSCSI passthrough
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*/
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*/
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static int
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static int
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target_emulate_write_same(struct se_task *task)
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target_emulate_write_same(struct se_task *task, int write_same32)
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{
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{
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struct se_cmd *cmd = task->task_se_cmd;
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struct se_cmd *cmd = task->task_se_cmd;
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struct se_device *dev = cmd->se_dev;
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struct se_device *dev = cmd->se_dev;
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sector_t lba = cmd->t_task.t_task_lba;
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sector_t range, lba = cmd->t_task.t_task_lba;
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unsigned int range;
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unsigned int num_blocks;
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int ret;
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int ret;
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/*
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* Extract num_blocks from the WRITE_SAME_* CDB. Then use the explict
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* range when non zero is supplied, otherwise calculate the remaining
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* range based on ->get_blocks() - starting LBA.
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*/
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if (write_same32)
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num_blocks = get_unaligned_be32(&cmd->t_task.t_task_cdb[28]);
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else
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num_blocks = get_unaligned_be32(&cmd->t_task.t_task_cdb[10]);
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range = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
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if (num_blocks != 0)
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range = num_blocks;
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else
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range = (dev->transport->get_blocks(dev) - lba);
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printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %u\n",
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printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
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(unsigned long long)lba, range);
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(unsigned long long)lba, (unsigned long long)range);
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ret = dev->transport->do_discard(dev, lba, range);
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ret = dev->transport->do_discard(dev, lba, range);
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if (ret < 0) {
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if (ret < 0) {
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@ -1081,7 +1093,7 @@ transport_emulate_control_cdb(struct se_task *task)
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" for: %s\n", dev->transport->name);
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" for: %s\n", dev->transport->name);
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return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
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return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
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}
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}
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ret = target_emulate_write_same(task);
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ret = target_emulate_write_same(task, 0);
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break;
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break;
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case VARIABLE_LENGTH_CMD:
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case VARIABLE_LENGTH_CMD:
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service_action =
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service_action =
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@ -1094,7 +1106,7 @@ transport_emulate_control_cdb(struct se_task *task)
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dev->transport->name);
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dev->transport->name);
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return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
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return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
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}
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}
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ret = target_emulate_write_same(task);
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ret = target_emulate_write_same(task, 1);
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break;
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break;
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default:
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default:
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printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
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printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
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@ -3132,7 +3132,12 @@ static int transport_generic_cmd_sequencer(
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sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
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sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
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if (sector_ret)
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if (sector_ret)
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goto out_unsupported_cdb;
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goto out_unsupported_cdb;
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size = transport_get_size(sectors, cdb, cmd);
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if (sectors != 0)
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size = transport_get_size(sectors, cdb, cmd);
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else
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size = dev->se_sub_dev->se_dev_attrib.block_size;
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cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[12]);
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cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[12]);
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cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
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cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
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@ -3416,7 +3421,12 @@ static int transport_generic_cmd_sequencer(
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sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
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sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
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if (sector_ret)
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if (sector_ret)
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goto out_unsupported_cdb;
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goto out_unsupported_cdb;
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size = transport_get_size(sectors, cdb, cmd);
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if (sectors != 0)
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size = transport_get_size(sectors, cdb, cmd);
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else
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size = dev->se_sub_dev->se_dev_attrib.block_size;
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cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[2]);
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cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[2]);
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passthrough = (dev->transport->transport_type ==
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passthrough = (dev->transport->transport_type ==
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TRANSPORT_PLUGIN_PHBA_PDEV);
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TRANSPORT_PLUGIN_PHBA_PDEV);
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