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target/pr: cleanup core_scsi3_pr_seq_non_holder 

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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2015-03-29 09:39:03 +02:00 committed by Nicholas Bellinger
parent 79dc9c9e86
commit 9fcb57f39c
1 changed files with 18 additions and 26 deletions
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44
drivers/target/target_core_pr.c
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@ -312,34 +312,31 @@ target_scsi2_reservation_reserve(struct se_cmd *cmd)
* 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(DEF_PR_REG_ACTIVE, &se_deve->deve_flags);
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(DEF_PR_REG_ACTIVE,
&se_deve->deve_flags);
rcu_read_unlock();
}
switch (pr_reg_type) {
case PR_TYPE_WRITE_EXCLUSIVE:
@ -349,8 +346,6 @@ 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 +354,6 @@ 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 +362,6 @@ 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 +567,7 @@ 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 +580,7 @@ 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 +588,7 @@ 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;
}