[PATCH-v2 4/9] target/pr: cleanup core_scsi3_pr_seq_non_holder

Nicholas A. Bellinger
2015-05-22T06:14:00Z

From: Christoph Hellwig <hch@lst.de>

Clean up the mess of registered variables, and pass the isid mismatch
flag explicitly instead of overloading the registration type.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_pr.c | 43 ++++++++++++++++-------------------------
1 file changed, 17 insertions(+), 26 deletions(-)

diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 94a136f..36bcc60 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -312,34 +312,30 @@ out:
* This function is called by those initiator ports who are *NOT*
* the active PR reservation holder when a reservation is present.
*/
-static int core_scsi3_pr_seq_non_holder(
- struct se_cmd *cmd,
- u32 pr_reg_type)
+static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
+ bool isid_mismatch)
{
unsigned char *cdb = cmd->t_task_cdb;
- struct se_dev_entry *se_deve;
struct se_session *se_sess = cmd->se_sess;
struct se_node_acl *nacl = se_sess->se_node_acl;
- int other_cdb = 0, ignore_reg;
+ int other_cdb = 0;
int registered_nexus = 0, ret = 1; /* Conflict by default */
int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
int we = 0; /* Write Exclusive */
int legacy = 0; /* Act like a legacy device and return
* RESERVATION CONFLICT on some CDBs */
- bool registered = false;

- rcu_read_lock();
- se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
- if (se_deve)
- registered = test_bit(1, &se_deve->pr_reg);
- rcu_read_unlock();
- /*
- * Determine if the registration should be ignored due to
- * non-matching ISIDs in target_scsi3_pr_reservation_check().
- */
- ignore_reg = (pr_reg_type & 0x80000000);
- if (ignore_reg)
- pr_reg_type &= ~0x80000000;
+ if (isid_mismatch) {
+ registered_nexus = 0;
+ } else {
+ struct se_dev_entry *se_deve;
+
+ rcu_read_lock();
+ se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
+ if (se_deve)
+ registered_nexus = test_bit(1, &se_deve->pr_reg);
+ rcu_read_unlock();
+ }

switch (pr_reg_type) {
case PR_TYPE_WRITE_EXCLUSIVE:
@@ -349,8 +345,6 @@ static int core_scsi3_pr_seq_non_holder(
* Some commands are only allowed for the persistent reservation
* holder.
*/
- if ((registered) && !(ignore_reg))
- registered_nexus = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
we = 1;
@@ -359,8 +353,6 @@ static int core_scsi3_pr_seq_non_holder(
* Some commands are only allowed for registered I_T Nexuses.
*/
reg_only = 1;
- if ((registered) && !(ignore_reg))
- registered_nexus = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
we = 1;
@@ -369,8 +361,6 @@ static int core_scsi3_pr_seq_non_holder(
* Each registered I_T Nexus is a reservation holder.
*/
all_reg = 1;
- if ((registered) && !(ignore_reg))
- registered_nexus = 1;
break;
default:
return -EINVAL;
@@ -576,6 +566,7 @@ target_scsi3_pr_reservation_check(struct se_cmd *cmd)
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
u32 pr_reg_type;
+ bool isid_mismatch = false;

if (!dev->dev_pr_res_holder)
return 0;
@@ -588,7 +579,7 @@ target_scsi3_pr_reservation_check(struct se_cmd *cmd)
if (dev->dev_pr_res_holder->isid_present_at_reg) {
if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
sess->sess_bin_isid) {
- pr_reg_type |= 0x80000000;
+ isid_mismatch = true;
goto check_nonholder;
}
}
@@ -596,7 +587,7 @@ target_scsi3_pr_reservation_check(struct se_cmd *cmd)
return 0;

check_nonholder:
- if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
+ if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
return TCM_RESERVATION_CONFLICT;
return 0;
}
--
1.9.1