From 12f66e4a0f7b5624901ba4301210e026c9ddf78d Mon Sep 17 00:00:00 2001 From: Jiang Yi Date: Fri, 2 Jun 2017 11:45:09 +0800 Subject: target: reject COMPARE_AND_WRITE if emulate_caw is not set In struct se_dev_attrib, there is a field emulate_caw exposed as a /sys/kernel/config/target/core/$HBA/$DEV/attrib/. If this field is set zero, it means the corresponding struct se_device does not support the scsi cmd COMPARE_AND_WRITE In function sbc_parse_cdb(), go ahead and reject scsi COMPARE_AND_WRITE if emulate_caw is not set, because it has been explicitly disabled from user-space. (Make pr_err ratelimited - nab) Signed-off-by: Jiang Yi Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_sbc.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/target') diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 4316f7b65fb7..ff4a6ec30adf 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -1005,6 +1005,12 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) break; } case COMPARE_AND_WRITE: + if (!dev->dev_attrib.emulate_caw) { + pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject" + " COMPARE_AND_WRITE\n", dev->se_hba->backend->ops->name, + dev->dev_group.cg_item.ci_name, dev->t10_wwn.unit_serial); + return TCM_UNSUPPORTED_SCSI_OPCODE; + } sectors = cdb[13]; /* * Currently enforce COMPARE_AND_WRITE for a single sector -- cgit v1.2.3