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tipc: convert tipc_bearers array to pointer list 

As part of the effort to introduce RCU protection for the bearer
list, we first need to change it to a list of pointers.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2014-03-27 12:54:33 +08:00 committed by David S. Miller
parent 78dfb789b6
commit 3874ccbba8
3 changed files with 38 additions and 15 deletions
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5
net/tipc/bcast.c
View File

@ -668,9 +668,8 @@ void tipc_bcbearer_sort(void)
memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
struct tipc_bearer *b = &tipc_bearers[b_index];
if (!b->active || !b->nodes.count)
struct tipc_bearer *b = bearer_list[b_index];
if (!b || !b->active || !b->nodes.count)
continue;
if (!bp_temp[b->priority].primary)

46
net/tipc/bearer.c
View File

@ -49,7 +49,7 @@ static struct tipc_media * const media_info_array[] = {
NULL
};
struct tipc_bearer tipc_bearers[MAX_BEARERS];
struct tipc_bearer *bearer_list[MAX_BEARERS];
static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);
@ -177,8 +177,9 @@ struct tipc_bearer *tipc_bearer_find(const char *name)
struct tipc_bearer *b_ptr;
u32 i;
for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
if (b_ptr->active && (!strcmp(b_ptr->name, name)))
for (i = 0; i < MAX_BEARERS; i++) {
b_ptr = bearer_list[i];
if (b_ptr && b_ptr->active && (!strcmp(b_ptr->name, name)))
return b_ptr;
}
return NULL;
@ -200,7 +201,9 @@ struct sk_buff *tipc_bearer_get_names(void)
read_lock_bh(&tipc_net_lock);
for (i = 0; media_info_array[i] != NULL; i++) {
for (j = 0; j < MAX_BEARERS; j++) {
b = &tipc_bearers[j];
b = bearer_list[j];
if (!b)
continue;
if (b->active && (b->media == media_info_array[i])) {
tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
b->name,
@ -284,16 +287,17 @@ restart:
bearer_id = MAX_BEARERS;
with_this_prio = 1;
for (i = MAX_BEARERS; i-- != 0; ) {
if (!tipc_bearers[i].active) {
b_ptr = bearer_list[i];
if (!b_ptr || !b_ptr->active) {
bearer_id = i;
continue;
}
if (!strcmp(name, tipc_bearers[i].name)) {
if (!strcmp(name, b_ptr->name)) {
pr_warn("Bearer <%s> rejected, already enabled\n",
name);
goto exit;
}
if ((tipc_bearers[i].priority == priority) &&
if ((b_ptr->priority == priority) &&
(++with_this_prio > 2)) {
if (priority-- == 0) {
pr_warn("Bearer <%s> rejected, duplicate priority\n",
@ -311,7 +315,11 @@ restart:
goto exit;
}
b_ptr = &tipc_bearers[bearer_id];
b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
if (!b_ptr) {
res = -ENOMEM;
goto exit;
}
strcpy(b_ptr->name, name);
b_ptr->media = m_ptr;
res = m_ptr->enable_media(b_ptr);
@ -335,6 +343,9 @@ restart:
name);
goto exit;
}
bearer_list[bearer_id] = b_ptr;
pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
name,
tipc_addr_string_fill(addr_string, disc_domain), priority);
@ -362,13 +373,22 @@ static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
*/
static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
{
u32 i;
pr_info("Disabling bearer <%s>\n", b_ptr->name);
b_ptr->media->disable_media(b_ptr);
tipc_link_delete_list(b_ptr->identity, shutting_down);
if (b_ptr->link_req)
tipc_disc_delete(b_ptr->link_req);
memset(b_ptr, 0, sizeof(struct tipc_bearer));
for (i = 0; i < MAX_BEARERS; i++) {
if (b_ptr == bearer_list[i]) {
bearer_list[i] = NULL;
break;
}
}
kfree(b_ptr);
}
int tipc_disable_bearer(const char *name)
@ -603,10 +623,14 @@ void tipc_bearer_cleanup(void)
void tipc_bearer_stop(void)
{
struct tipc_bearer *b_ptr;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
if (tipc_bearers[i].active)
bearer_disable(&tipc_bearers[i], true);
b_ptr = bearer_list[i];
if (b_ptr && b_ptr->active) {
bearer_disable(b_ptr, true);
bearer_list[i] = NULL;
}
}
}

2
net/tipc/bearer.h
View File

@ -150,7 +150,7 @@ struct tipc_bearer_names {
struct tipc_link;
extern struct tipc_bearer tipc_bearers[];
extern struct tipc_bearer *bearer_list[];
/*
* TIPC routines available to supported media types