From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch adds a check within sbc_setup_write_same() to fail a
WRITE_SAME w/ UNMAP=1 op, if the backend device has emulate_tpws
disabled.
Cc: Martin Petersen <martin.petersen@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/target_core_sbc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 856e800..0d307c3 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -293,6 +293,11 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
if (!ops->execute_write_same_unmap)
return TCM_UNSUPPORTED_SCSI_OPCODE;
+ if (!dev->dev_attrib.emulate_tpws) {
+ pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
+ " has emulate_tpws disabled\n");
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+ }
cmd->execute_cmd = ops->execute_write_same_unmap;
return 0;
}
--
1.9.1
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