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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>
This commit is contained in:
Nicholas Bellinger 2011-05-06 17:55:35 -07:00
parent 1eb437a4ac
commit dd3a5ad8e0
2 changed files with 32 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/target/target_core_cdb.c
View File

@ -1008,18 +1008,30 @@ target_emulate_unmap(struct se_task *task)
* Note this is not used for TCM/pSCSI passthrough
*/
static int
target_emulate_write_same(struct se_task *task)
target_emulate_write_same(struct se_task *task, int write_same32)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
sector_t lba = cmd->t_task.t_task_lba;
unsigned int range;
sector_t range, lba = cmd->t_task.t_task_lba;
unsigned int num_blocks;
int ret;
/*
* Extract num_blocks from the WRITE_SAME_* CDB. Then use the explict
* range when non zero is supplied, otherwise calculate the remaining
* range based on ->get_blocks() - starting LBA.
*/
if (write_same32)
num_blocks = get_unaligned_be32(&cmd->t_task.t_task_cdb[28]);
else
num_blocks = get_unaligned_be32(&cmd->t_task.t_task_cdb[10]);
range = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
if (num_blocks != 0)
range = num_blocks;
else
range = (dev->transport->get_blocks(dev) - lba);
printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %u\n",
(unsigned long long)lba, range);
printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
(unsigned long long)lba, (unsigned long long)range);
ret = dev->transport->do_discard(dev, lba, range);
if (ret < 0) {
@ -1081,7 +1093,7 @@ transport_emulate_control_cdb(struct se_task *task)
" for: %s\n", dev->transport->name);
return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
}
ret = target_emulate_write_same(task);
ret = target_emulate_write_same(task, 0);
break;
case VARIABLE_LENGTH_CMD:
service_action =
@ -1094,7 +1106,7 @@ transport_emulate_control_cdb(struct se_task *task)
dev->transport->name);
return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
}
ret = target_emulate_write_same(task);
ret = target_emulate_write_same(task, 1);
break;
default:
printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"

14
drivers/target/target_core_transport.c
View File

@ -3132,7 +3132,12 @@ static int transport_generic_cmd_sequencer(
sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
if (sector_ret)
goto out_unsupported_cdb;
size = transport_get_size(sectors, cdb, cmd);
if (sectors != 0)
size = transport_get_size(sectors, cdb, cmd);
else
size = dev->se_sub_dev->se_dev_attrib.block_size;
cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[12]);
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
@ -3416,7 +3421,12 @@ static int transport_generic_cmd_sequencer(
sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
if (sector_ret)
goto out_unsupported_cdb;
size = transport_get_size(sectors, cdb, cmd);
if (sectors != 0)
size = transport_get_size(sectors, cdb, cmd);
else
size = dev->se_sub_dev->se_dev_attrib.block_size;
cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[2]);
passthrough = (dev->transport->transport_type ==
TRANSPORT_PLUGIN_PHBA_PDEV);