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authorBart Van Assche <bart.vanassche@sandisk.com>2017-03-30 10:12:39 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2017-05-01 22:20:49 -0700
commit0e2eb7d12eaa8e391bf5615d4271bb87a649caaa (patch)
tree8c46d9fc3db0adfcdbb17f4c6ffc811a59309704 /drivers/target
parentd65e655706e4827fb061daff399e07806b1223ad (diff)
target: Fix VERIFY and WRITE VERIFY command parsing
Use the value of the BYTCHK field to determine the size of the Data-Out buffer. For VERIFY, honor the VRPROTECT, DPO and FUA fields. This patch avoids that LIO complains about a mismatch between the expected transfer length and the SCSI CDB length if the value of the BYTCHK field is 0. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Max Lohrmann <post@wickenrode.com> Cc: <stable@vger.kernel.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_sbc.c71
1 files changed, 62 insertions, 9 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index c194063f169b..ee35c90e3b8d 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -828,6 +828,59 @@ sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
return 0;
}
+/**
+ * sbc_parse_verify - parse VERIFY, VERIFY_16 and WRITE VERIFY commands
+ * @cmd: (in) structure that describes the SCSI command to be parsed.
+ * @sectors: (out) Number of logical blocks on the storage medium that will be
+ * affected by the SCSI command.
+ * @bufflen: (out) Expected length of the SCSI Data-Out buffer.
+ */
+static sense_reason_t sbc_parse_verify(struct se_cmd *cmd, int *sectors,
+ u32 *bufflen)
+{
+ struct se_device *dev = cmd->se_dev;
+ u8 *cdb = cmd->t_task_cdb;
+ u8 bytchk = (cdb[1] >> 1) & 3;
+ sense_reason_t ret;
+
+ switch (cdb[0]) {
+ case VERIFY:
+ case WRITE_VERIFY:
+ *sectors = transport_get_sectors_10(cdb);
+ cmd->t_task_lba = transport_lba_32(cdb);
+ break;
+ case VERIFY_16:
+ *sectors = transport_get_sectors_16(cdb);
+ cmd->t_task_lba = transport_lba_64(cdb);
+ break;
+ default:
+ WARN_ON_ONCE(true);
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+ }
+
+ if (sbc_check_dpofua(dev, cmd, cdb))
+ return TCM_INVALID_CDB_FIELD;
+
+ ret = sbc_check_prot(dev, cmd, cdb, *sectors, true);
+ if (ret)
+ return ret;
+
+ switch (bytchk) {
+ case 0:
+ *bufflen = 0;
+ break;
+ case 1:
+ *bufflen = sbc_get_size(cmd, *sectors);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
+ break;
+ default:
+ pr_err("Unsupported BYTCHK value %d for SCSI opcode %#x\n",
+ bytchk, cdb[0]);
+ return TCM_INVALID_CDB_FIELD;
+ }
+ return TCM_NO_SENSE;
+}
+
sense_reason_t
sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
{
@@ -895,7 +948,6 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
cmd->execute_cmd = sbc_execute_rw;
break;
case WRITE_10:
- case WRITE_VERIFY:
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
@@ -909,6 +961,12 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_cmd = sbc_execute_rw;
break;
+ case WRITE_VERIFY:
+ ret = sbc_parse_verify(cmd, &sectors, &size);
+ if (ret)
+ return ret;
+ cmd->execute_cmd = sbc_execute_rw;
+ goto check_lba;
case WRITE_12:
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
@@ -1106,14 +1164,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
break;
case VERIFY:
case VERIFY_16:
- size = 0;
- if (cdb[0] == VERIFY) {
- sectors = transport_get_sectors_10(cdb);
- cmd->t_task_lba = transport_lba_32(cdb);
- } else {
- sectors = transport_get_sectors_16(cdb);
- cmd->t_task_lba = transport_lba_64(cdb);
- }
+ ret = sbc_parse_verify(cmd, &sectors, &size);
+ if (ret)
+ return ret;
cmd->execute_cmd = sbc_emulate_noop;
goto check_lba;
case REZERO_UNIT: