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target: reject COMPARE_AND_WRITE if emulate_caw is not set

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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 <jiangyilism@gmail.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Jiang Yi 2017-06-02 11:45:09 +08:00 committed by Nicholas Bellinger
parent eceb4459df
commit 12f66e4a0f
1 changed files with 6 additions and 0 deletions
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6
drivers/target/target_core_sbc.c
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@ -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