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target: Add Third Party Copy (3PC) bit in INQUIRY response 

This patch adds the Third Party Copy (3PC) bit to signal support
for EXTENDED_COPY within standard inquiry response data.

Also add emulate_3pc device attribute in configfs (enabled by default)
to allow the exposure of this bit to be disabled, if necessary.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Zach Brown <zab@redhat.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
This commit is contained in:
Nicholas Bellinger 2013-08-22 14:17:20 -07:00 committed by Nicholas Bellinger
parent 04b1b79546
commit d397a445f4
5 changed files with 28 additions and 0 deletions
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4
drivers/target/target_core_configfs.c
View File

@ -639,6 +639,9 @@ SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(emulate_caw);
SE_DEV_ATTR(emulate_caw, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(emulate_3pc);
SE_DEV_ATTR(emulate_3pc, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(enforce_pr_isids);
SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
@ -697,6 +700,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
&target_core_dev_attrib_emulate_tpu.attr,
&target_core_dev_attrib_emulate_tpws.attr,
&target_core_dev_attrib_emulate_caw.attr,
&target_core_dev_attrib_emulate_3pc.attr,
&target_core_dev_attrib_enforce_pr_isids.attr,
&target_core_dev_attrib_is_nonrot.attr,
&target_core_dev_attrib_emulate_rest_reord.attr,

14
drivers/target/target_core_device.c
View File

@ -906,6 +906,19 @@ int se_dev_set_emulate_caw(struct se_device *dev, int flag)
return 0;
}
int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
dev->dev_attrib.emulate_3pc = flag;
pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
dev, flag);
return 0;
}
int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
@ -1442,6 +1455,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
dev->dev_attrib.is_nonrot = DA_IS_NONROT;
dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;

1
drivers/target/target_core_internal.h
View File

@ -34,6 +34,7 @@ int se_dev_set_emulate_tas(struct se_device *, int);
int se_dev_set_emulate_tpu(struct se_device *, int);
int se_dev_set_emulate_tpws(struct se_device *, int);
int se_dev_set_emulate_caw(struct se_device *, int);
int se_dev_set_emulate_3pc(struct se_device *, int);
int se_dev_set_enforce_pr_isids(struct se_device *, int);
int se_dev_set_is_nonrot(struct se_device *, int);
int se_dev_set_emulate_rest_reord(struct se_device *dev, int);

6
drivers/target/target_core_spc.c
View File

@ -95,6 +95,12 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
*/
spc_fill_alua_data(lun->lun_sep, buf);
/*
* Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
*/
if (dev->dev_attrib.emulate_3pc)
buf[5] |= 0x8;
buf[7] = 0x2; /* CmdQue=1 */
snprintf(&buf[8], 8, "LIO-ORG");

3
include/target/target_core_base.h
View File

@ -99,6 +99,8 @@
#define DA_EMULATE_TPWS 0
/* Emulation for CompareAndWrite (AtomicTestandSet) by default */
#define DA_EMULATE_CAW 1
/* Emulation for 3rd Party Copy (ExtendedCopy) by default */
#define DA_EMULATE_3PC 1
/* No Emulation for PSCSI by default */
#define DA_EMULATE_ALUA 0
/* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
@ -606,6 +608,7 @@ struct se_dev_attrib {
int emulate_tpu;
int emulate_tpws;
int emulate_caw;
int emulate_3pc;
int enforce_pr_isids;
int is_nonrot;
int emulate_rest_reord;