According to sbc3r27, WRITE SAME with sectors=0 either writes to the
end of the lun, or returns an error, depending on if WSNZ was set to 0 or
1 in the block limits VPD (0xB0). This patch sets that bit, and
returns the error. Previously we used the block size, I don't know why,
but it seems wrong.
Signed-off-by: Andy Grover <agrover@xxxxxxxxxx>
---
drivers/target/target_core_cdb.c | 3 +++
drivers/target/target_core_transport.c | 17 +++++++++++------
2 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 9511a9e..f0779f1 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -520,6 +520,9 @@ target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
buf[1] = 0xb0;
buf[3] = have_tp ? 0x3c : 0x10;
+ /* Set WSNZ to 1 */
+ buf[4] = 0x01;
+
/*
* Set OPTIMAL TRANSFER LENGTH GRANULARITY
*/
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index fff099a..c647e1f 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3072,10 +3072,13 @@ static int transport_generic_cmd_sequencer(
if (sector_ret)
goto out_unsupported_cdb;
- if (sectors != 0)
+ if (sectors)
size = transport_get_size(sectors, cdb, cmd);
- else
- size = dev->se_sub_dev->se_dev_attrib.block_size;
+ else {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
+ " supported\n");
+ goto out_invalid_cdb_field;
+ }
cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
@@ -3349,10 +3352,12 @@ static int transport_generic_cmd_sequencer(
if (sector_ret)
goto out_unsupported_cdb;
- if (sectors != 0)
+ if (sectors)
size = transport_get_size(sectors, cdb, cmd);
- else
- size = dev->se_sub_dev->se_dev_attrib.block_size;
+ else {
+ pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
+ goto out_invalid_cdb_field;
+ }
cmd->t_task_lba = get_unaligned_be16(&cdb[2]);
passthrough = (dev->transport->transport_type ==
--
1.7.1
--
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