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target: refactor core_update_device_list_for_node()
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Code was almost entirely divided based on value of bool param "enable".

Split it into two functions.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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Andy Grover authored and Nicholas Bellinger committed Jul 17, 2012
1 parent cdf88a2 commit e80ac6c
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Showing 3 changed files with 103 additions and 77 deletions.
166 changes: 95 additions & 71 deletions drivers/target/target_core_device.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -300,8 +300,8 @@ int core_free_device_list_for_node(
lun = deve->se_lun;

spin_unlock_irq(&nacl->device_list_lock);
core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
spin_lock_irq(&nacl->device_list_lock);
}
spin_unlock_irq(&nacl->device_list_lock);
Expand Down Expand Up @@ -342,72 +342,46 @@ void core_update_device_list_access(
spin_unlock_irq(&nacl->device_list_lock);
}

/* core_update_device_list_for_node():
/* core_enable_device_list_for_node():
*
*
*/
int core_update_device_list_for_node(
int core_enable_device_list_for_node(
struct se_lun *lun,
struct se_lun_acl *lun_acl,
u32 mapped_lun,
u32 lun_access,
struct se_node_acl *nacl,
struct se_portal_group *tpg,
int enable)
struct se_portal_group *tpg)
{
struct se_port *port = lun->lun_sep;
struct se_dev_entry *deve = nacl->device_list[mapped_lun];
int trans = 0;
/*
* If the MappedLUN entry is being disabled, the entry in
* port->sep_alua_list must be removed now before clearing the
* struct se_dev_entry pointers below as logic in
* core_alua_do_transition_tg_pt() depends on these being present.
*/
if (!enable) {
/*
* deve->se_lun_acl will be NULL for demo-mode created LUNs
* that have not been explicitly concerted to MappedLUNs ->
* struct se_lun_acl, but we remove deve->alua_port_list from
* port->sep_alua_list. This also means that active UAs and
* NodeACL context specific PR metadata for demo-mode
* MappedLUN *deve will be released below..
*/
spin_lock_bh(&port->sep_alua_lock);
list_del(&deve->alua_port_list);
spin_unlock_bh(&port->sep_alua_lock);
}
struct se_dev_entry *deve;

spin_lock_irq(&nacl->device_list_lock);
if (enable) {
/*
* Check if the call is handling demo mode -> explict LUN ACL
* transition. This transition must be for the same struct se_lun
* + mapped_lun that was setup in demo mode..
*/
if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
if (deve->se_lun_acl != NULL) {
pr_err("struct se_dev_entry->se_lun_acl"
" already set for demo mode -> explict"
" LUN ACL transition\n");
spin_unlock_irq(&nacl->device_list_lock);
return -EINVAL;
}
if (deve->se_lun != lun) {
pr_err("struct se_dev_entry->se_lun does"
" match passed struct se_lun for demo mode"
" -> explict LUN ACL transition\n");
spin_unlock_irq(&nacl->device_list_lock);
return -EINVAL;
}
deve->se_lun_acl = lun_acl;
trans = 1;
} else {
deve->se_lun = lun;
deve->se_lun_acl = lun_acl;
deve->mapped_lun = mapped_lun;
deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;

deve = nacl->device_list[mapped_lun];

/*
* Check if the call is handling demo mode -> explict LUN ACL
* transition. This transition must be for the same struct se_lun
* + mapped_lun that was setup in demo mode..
*/
if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
if (deve->se_lun_acl != NULL) {
pr_err("struct se_dev_entry->se_lun_acl"
" already set for demo mode -> explict"
" LUN ACL transition\n");
spin_unlock_irq(&nacl->device_list_lock);
return -EINVAL;
}
if (deve->se_lun != lun) {
pr_err("struct se_dev_entry->se_lun does"
" match passed struct se_lun for demo mode"
" -> explict LUN ACL transition\n");
spin_unlock_irq(&nacl->device_list_lock);
return -EINVAL;
}
deve->se_lun_acl = lun_acl;

if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
Expand All @@ -417,20 +391,70 @@ int core_update_device_list_for_node(
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
}

if (trans) {
spin_unlock_irq(&nacl->device_list_lock);
return 0;
}
deve->creation_time = get_jiffies_64();
deve->attach_count++;
spin_unlock_irq(&nacl->device_list_lock);
return 0;
}

spin_lock_bh(&port->sep_alua_lock);
list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
spin_unlock_bh(&port->sep_alua_lock);
deve->se_lun = lun;
deve->se_lun_acl = lun_acl;
deve->mapped_lun = mapped_lun;
deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;

return 0;
if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
} else {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
}

deve->creation_time = get_jiffies_64();
deve->attach_count++;
spin_unlock_irq(&nacl->device_list_lock);

spin_lock_bh(&port->sep_alua_lock);
list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
spin_unlock_bh(&port->sep_alua_lock);

return 0;
}

/* core_disable_device_list_for_node():
*
*
*/
int core_disable_device_list_for_node(
struct se_lun *lun,
struct se_lun_acl *lun_acl,
u32 mapped_lun,
u32 lun_access,
struct se_node_acl *nacl,
struct se_portal_group *tpg)
{
struct se_port *port = lun->lun_sep;
struct se_dev_entry *deve;

spin_lock_irq(&nacl->device_list_lock);

deve = nacl->device_list[mapped_lun];

/*
* If the MappedLUN entry is being disabled, the entry in
* port->sep_alua_list must be removed now before clearing the
* struct se_dev_entry pointers below as logic in
* core_alua_do_transition_tg_pt() depends on these being present.
*
* deve->se_lun_acl will be NULL for demo-mode created LUNs
* that have not been explicitly converted to MappedLUNs ->
* struct se_lun_acl, but we remove deve->alua_port_list from
* port->sep_alua_list. This also means that active UAs and
* NodeACL context specific PR metadata for demo-mode
* MappedLUN *deve will be released below..
*/
spin_lock_bh(&port->sep_alua_lock);
list_del(&deve->alua_port_list);
spin_unlock_bh(&port->sep_alua_lock);

/*
* Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
* PR operation to complete.
Expand Down Expand Up @@ -475,9 +499,9 @@ void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
continue;
spin_unlock_irq(&nacl->device_list_lock);

core_update_device_list_for_node(lun, NULL,
core_disable_device_list_for_node(lun, NULL,
deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
nacl, tpg, 0);
nacl, tpg);

spin_lock_irq(&nacl->device_list_lock);
}
Expand Down Expand Up @@ -1469,8 +1493,8 @@ int core_dev_add_initiator_node_lun_acl(

lacl->se_lun = lun;

if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
lun_access, nacl, tpg, 1) < 0)
if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
lun_access, nacl, tpg) < 0)
return -EINVAL;

spin_lock(&lun->lun_acl_lock);
Expand Down Expand Up @@ -1513,8 +1537,8 @@ int core_dev_del_initiator_node_lun_acl(
smp_mb__after_atomic_dec();
spin_unlock(&lun->lun_acl_lock);

core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);

lacl->se_lun = NULL;

Expand Down
6 changes: 4 additions & 2 deletions drivers/target/target_core_internal.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,10 @@ int core_free_device_list_for_node(struct se_node_acl *,
struct se_portal_group *);
void core_dec_lacl_count(struct se_node_acl *, struct se_cmd *);
void core_update_device_list_access(u32, u32, struct se_node_acl *);
int core_update_device_list_for_node(struct se_lun *, struct se_lun_acl *,
u32, u32, struct se_node_acl *, struct se_portal_group *, int);
int core_enable_device_list_for_node(struct se_lun *, struct se_lun_acl *,
u32, u32, struct se_node_acl *, struct se_portal_group *);
int core_disable_device_list_for_node(struct se_lun *, struct se_lun_acl *,
u32, u32, struct se_node_acl *, struct se_portal_group *);
void core_clear_lun_from_tpg(struct se_lun *, struct se_portal_group *);
int core_dev_export(struct se_device *, struct se_portal_group *,
struct se_lun *);
Expand Down
8 changes: 4 additions & 4 deletions drivers/target/target_core_tpg.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -77,8 +77,8 @@ static void core_clear_initiator_node_from_tpg(

lun = deve->se_lun;
spin_unlock_irq(&nacl->device_list_lock);
core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);

spin_lock_irq(&nacl->device_list_lock);
}
Expand Down Expand Up @@ -172,8 +172,8 @@ void core_tpg_add_node_to_devs(
(lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
"READ-WRITE" : "READ-ONLY");

core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
lun_access, acl, tpg, 1);
core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
lun_access, acl, tpg);
spin_lock(&tpg->tpg_lun_lock);
}
spin_unlock(&tpg->tpg_lun_lock);
Expand Down

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