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target: Add force_pr_aptpl device attribute 

This patch adds a force_pr_aptpl device attribute used to force SPC-3 PR
Activate Persistence across Target Power Loss (APTPL) operation.  This
makes PR metadata write-out occur during state change regardless if new
PERSISTENT_RESERVE_OUT CDBs have their APTPL feature bit set.

This is useful during H/A failover in active/passive setups where all PR
state is being re-created on a different node, driven by configfs backend
device + export layout and pre-loaded $DEV/pr/res_aptpl_metadata.

Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-10-04 01:06:08 +00:00
parent e24805637d
commit 92404e609a
5 changed files with 35 additions and 0 deletions
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4
drivers/target/target_core_configfs.c
View File

@ -665,6 +665,9 @@ 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(force_pr_aptpl);
SE_DEV_ATTR(force_pr_aptpl, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB_RO(hw_block_size);
SE_DEV_ATTR_RO(hw_block_size);
@ -719,6 +722,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
&target_core_dev_attrib_hw_pi_prot_type.attr,
&target_core_dev_attrib_pi_prot_format.attr,
&target_core_dev_attrib_enforce_pr_isids.attr,
&target_core_dev_attrib_force_pr_aptpl.attr,
&target_core_dev_attrib_is_nonrot.attr,
&target_core_dev_attrib_emulate_rest_reord.attr,
&target_core_dev_attrib_hw_block_size.attr,

18
drivers/target/target_core_device.c
View File

@ -1018,6 +1018,23 @@ int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
return 0;
}
int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
printk(KERN_ERR "Illegal value %d\n", flag);
return -EINVAL;
}
if (dev->export_count) {
pr_err("dev[%p]: Unable to set force_pr_aptpl while"
" export_count is %d\n", dev, dev->export_count);
return -EINVAL;
}
dev->dev_attrib.force_pr_aptpl = flag;
pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
return 0;
}
int se_dev_set_is_nonrot(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
@ -1544,6 +1561,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
dev->dev_attrib.is_nonrot = DA_IS_NONROT;
dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;

1
drivers/target/target_core_internal.h
View File

@ -38,6 +38,7 @@ int se_dev_set_emulate_3pc(struct se_device *, int);
int se_dev_set_pi_prot_type(struct se_device *, int);
int se_dev_set_pi_prot_format(struct se_device *, int);
int se_dev_set_enforce_pr_isids(struct se_device *, int);
int se_dev_set_force_pr_aptpl(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);
int se_dev_set_queue_depth(struct se_device *, u32);

9
drivers/target/target_core_pr.c
View File

@ -895,6 +895,7 @@ static int __core_scsi3_check_aptpl_registration(
spin_lock(&pr_tmpl->aptpl_reg_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
pr_reg_aptpl_list) {
if (!strcmp(pr_reg->pr_iport, i_port) &&
(pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
!(strcmp(pr_reg->pr_tport, t_port)) &&
@ -3470,6 +3471,7 @@ static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
sense_reason_t
target_scsi3_emulate_pr_out(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *cdb = &cmd->t_task_cdb[0];
unsigned char *buf;
u64 res_key, sa_res_key;
@ -3534,6 +3536,13 @@ target_scsi3_emulate_pr_out(struct se_cmd *cmd)
aptpl = (buf[17] & 0x01);
unreg = (buf[17] & 0x02);
}
/*
* If the backend device has been configured to force APTPL metadata
* write-out, go ahead and propigate aptpl=1 down now.
*/
if (dev->dev_attrib.force_pr_aptpl)
aptpl = 1;
transport_kunmap_data_sg(cmd);
buf = NULL;

3
include/target/target_core_base.h
View File

@ -108,6 +108,8 @@
#define DA_EMULATE_ALUA 0
/* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
#define DA_ENFORCE_PR_ISIDS 1
/* Force SPC-3 PR Activate Persistence across Target Power Loss */
#define DA_FORCE_PR_APTPL 0
#define DA_STATUS_MAX_SECTORS_MIN 16
#define DA_STATUS_MAX_SECTORS_MAX 8192
/* By default don't report non-rotating (solid state) medium */
@ -680,6 +682,7 @@ struct se_dev_attrib {
enum target_prot_type pi_prot_type;
enum target_prot_type hw_pi_prot_type;
int enforce_pr_isids;
int force_pr_aptpl;
int is_nonrot;
int emulate_rest_reord;
u32 hw_block_size;