diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/target/target_core_cdb.c | 29 | ||||
| -rw-r--r-- | drivers/target/target_core_configfs.c | 4 | ||||
| -rw-r--r-- | drivers/target/target_core_device.c | 15 |
3 files changed, 47 insertions, 1 deletions
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c index 98283002366..145739bcf75 100644 --- a/drivers/target/target_core_cdb.c +++ b/drivers/target/target_core_cdb.c @@ -775,6 +775,35 @@ target_modesense_control(struct se_device *dev, unsigned char *p) p[1] = 0x0a; p[2] = 2; /* + * From spc4r23, 7.4.7 Control mode page + * + * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies + * restrictions on the algorithm used for reordering commands + * having the SIMPLE task attribute (see SAM-4). + * + * Table 368 -- QUEUE ALGORITHM MODIFIER field + * Code Description + * 0h Restricted reordering + * 1h Unrestricted reordering allowed + * 2h to 7h Reserved + * 8h to Fh Vendor specific + * + * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that + * the device server shall order the processing sequence of commands + * having the SIMPLE task attribute such that data integrity is maintained + * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol + * requests is halted at any time, the final value of all data observable + * on the medium shall be the same as if all the commands had been processed + * with the ORDERED task attribute). + * + * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the + * device server may reorder the processing sequence of commands having the + * SIMPLE task attribute in any manner. Any data integrity exposures related to + * command sequence order shall be explicitly handled by the application client + * through the selection of appropriate ommands and task attributes. + */ + p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; + /* * From spc4r17, section 7.4.6 Control mode Page * * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c index e56c39daeec..a92176d2e18 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -701,6 +701,9 @@ SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR); DEF_DEV_ATTRIB(is_nonrot); SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR); +DEF_DEV_ATTRIB(emulate_rest_reord); +SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR); + DEF_DEV_ATTRIB_RO(hw_block_size); SE_DEV_ATTR_RO(hw_block_size); @@ -750,6 +753,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = { &target_core_dev_attrib_emulate_tpws.attr, &target_core_dev_attrib_enforce_pr_isids.attr, &target_core_dev_attrib_is_nonrot.attr, + &target_core_dev_attrib_emulate_rest_reord.attr, &target_core_dev_attrib_hw_block_size.attr, &target_core_dev_attrib_block_size.attr, &target_core_dev_attrib_hw_max_sectors.attr, diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 81860ddc7cc..b38b6c993e6 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -857,6 +857,7 @@ void se_dev_set_default_attribs( dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA; dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS; dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT; + dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD; /* * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK * iblock_create_virtdevice() from struct queue_limits values @@ -1128,11 +1129,23 @@ int se_dev_set_is_nonrot(struct se_device *dev, int flag) return -EINVAL; } dev->se_sub_dev->se_dev_attrib.is_nonrot = flag; - printk(KERN_INFO "dev[%p]: SE Device is_nonrot bit: %d\n", + pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n", dev, flag); return 0; } +int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag) +{ + if (flag != 0) { + printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted" + " reordering not implemented\n", dev); + return -ENOSYS; + } + dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag; + pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag); + return 0; +} + /* * Note, this can only be called on unexported SE Device Object. */ |