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target/user: PGR Support 

This adds initial PGR support for just TCMU, since tcmu doesn't
have the necessary IT_NEXUS info to process PGR in userspace,
so have those commands be processed in kernel.

HA support is not available yet, we will work on it if this patch
is acceptable.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Bryant G. Ly 2017-04-21 20:40:50 -05:00 committed by Nicholas Bellinger
parent c2d26f18dc
commit 4ec5bf0ea8
5 changed files with 47 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/target/target_core_configfs.c
View File

@ -1400,7 +1400,7 @@ static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
struct se_device *dev = pr_to_dev(item);
int ret;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return sprintf(page, "Passthrough\n");
spin_lock(&dev->dev_reservation_lock);
@ -1540,7 +1540,7 @@ static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
{
struct se_device *dev = pr_to_dev(item);
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return sprintf(page, "SPC_PASSTHROUGH\n");
else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
return sprintf(page, "SPC2_RESERVATIONS\n");
@ -1553,7 +1553,7 @@ static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
{
struct se_device *dev = pr_to_dev(item);
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
return sprintf(page, "APTPL Bit Status: %s\n",
@ -1565,7 +1565,7 @@ static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
{
struct se_device *dev = pr_to_dev(item);
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
return sprintf(page, "Ready to process PR APTPL metadata..\n");
@ -1611,7 +1611,7 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
u16 tpgt = 0;
u8 type = 0;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return count;
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
return count;

38
drivers/target/target_core_device.c
View File

@ -1045,6 +1045,8 @@ passthrough_parse_cdb(struct se_cmd *cmd,
sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
{
unsigned char *cdb = cmd->t_task_cdb;
struct se_device *dev = cmd->se_dev;
unsigned int size;
/*
* Clear a lun set in the cdb if the initiator talking to use spoke
@ -1076,6 +1078,42 @@ passthrough_parse_cdb(struct se_cmd *cmd,
return TCM_NO_SENSE;
}
/*
* For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
* emulate the response, since tcmu does not have the information
* required to process these commands.
*/
if (!(dev->transport->transport_flags &
TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
if (cdb[0] == PERSISTENT_RESERVE_IN) {
cmd->execute_cmd = target_scsi3_emulate_pr_in;
size = (cdb[7] << 8) + cdb[8];
return target_cmd_size_check(cmd, size);
}
if (cdb[0] == PERSISTENT_RESERVE_OUT) {
cmd->execute_cmd = target_scsi3_emulate_pr_out;
size = (cdb[7] << 8) + cdb[8];
return target_cmd_size_check(cmd, size);
}
if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
cmd->execute_cmd = target_scsi2_reservation_release;
if (cdb[0] == RELEASE_10)
size = (cdb[7] << 8) | cdb[8];
else
size = cmd->data_length;
return target_cmd_size_check(cmd, size);
}
if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
cmd->execute_cmd = target_scsi2_reservation_reserve;
if (cdb[0] == RESERVE_10)
size = (cdb[7] << 8) | cdb[8];
else
size = cmd->data_length;
return target_cmd_size_check(cmd, size);
}
}
/* Set DATA_CDB flag for ops that should have it */
switch (cdb[0]) {
case READ_6:

2
drivers/target/target_core_pr.c
View File

@ -4147,7 +4147,7 @@ target_check_reservation(struct se_cmd *cmd)
return 0;
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
return 0;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
spin_lock(&dev->dev_reservation_lock);

3
drivers/target/target_core_pscsi.c
View File

@ -1081,7 +1081,8 @@ static const struct target_backend_ops pscsi_ops = {
.name = "pscsi",
.owner = THIS_MODULE,
.transport_flags = TRANSPORT_FLAG_PASSTHROUGH |
TRANSPORT_FLAG_PASSTHROUGH_ALUA,
TRANSPORT_FLAG_PASSTHROUGH_ALUA |
TRANSPORT_FLAG_PASSTHROUGH_PGR,
.attach_hba = pscsi_attach_hba,
.detach_hba = pscsi_detach_hba,
.pmode_enable_hba = pscsi_pmode_enable_hba,

1
include/target/target_core_backend.h
View File

@ -10,6 +10,7 @@
* backend module.
*/
#define TRANSPORT_FLAG_PASSTHROUGH_ALUA 0x2
#define TRANSPORT_FLAG_PASSTHROUGH_PGR 0x4
struct request_queue;
struct scatterlist;