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target: Return descriptor format sense data in case the LU spans 64bit sectors 

In case a LU spans 64bit sectors, fixed size sense data information
field is only 32 bits which means the sector information will be truncated.

Thus, if the LU spans 64bit sectors, use descriptor format sense data to
correctly report sector information.

Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg 2015-07-16 10:28:05 +03:00 committed by Nicholas Bellinger
parent f5a8b3a796
commit 4e4937e8ae
4 changed files with 18 additions and 4 deletions
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5
drivers/target/target_core_hba.c
View File

@ -176,3 +176,8 @@ core_delete_hba(struct se_hba *hba)
kfree(hba);
return 0;
}
bool target_sense_desc_format(struct se_device *dev)
{
return dev->transport->get_blocks(dev) > U32_MAX;
}

12
drivers/target/target_core_spc.c
View File

@ -761,7 +761,12 @@ static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
if (pc == 1)
goto out;
p[2] = 2;
/* GLTSD: No implicit save of log parameters */
p[2] = (1 << 1);
if (target_sense_desc_format(dev))
/* D_SENSE: Descriptor format sense data for 64bit sectors */
p[2] |= (1 << 2);
/*
* From spc4r23, 7.4.7 Control mode page
*
@ -1144,6 +1149,7 @@ static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
unsigned char *rbuf;
u8 ua_asc = 0, ua_ascq = 0;
unsigned char buf[SE_SENSE_BUF];
bool desc_format = target_sense_desc_format(cmd->se_dev);
memset(buf, 0, SE_SENSE_BUF);
@ -1158,10 +1164,10 @@ static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
scsi_build_sense_buffer(0, buf, UNIT_ATTENTION,
scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
ua_asc, ua_ascq);
else
scsi_build_sense_buffer(0, buf, NO_SENSE, 0x0, 0x0);
scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
transport_kunmap_data_sg(cmd);

3
drivers/target/target_core_transport.c
View File

@ -2735,6 +2735,7 @@ static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
u8 *buffer = cmd->sense_buffer;
int r = (__force int)reason;
u8 asc, ascq;
bool desc_format = target_sense_desc_format(cmd->se_dev);
if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
si = &sense_info_table[r];
@ -2754,7 +2755,7 @@ static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ascq = si->ascq;
}
scsi_build_sense_buffer(0, buffer, si->key, asc, ascq);
scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
if (si->add_sector_info)
return scsi_set_sense_information(buffer,
cmd->scsi_sense_length,

2
include/target/target_core_backend.h
View File

@ -93,4 +93,6 @@ bool target_lun_is_rdonly(struct se_cmd *);
sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
bool target_sense_desc_format(struct se_device *dev);
#endif /* TARGET_CORE_BACKEND_H */