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Diffstat (limited to 'fs/afs/vl_rotate.c')
-rw-r--r--fs/afs/vl_rotate.c127
1 files changed, 84 insertions, 43 deletions
diff --git a/fs/afs/vl_rotate.c b/fs/afs/vl_rotate.c
index e2dc54082a..d8f79f6ada 100644
--- a/fs/afs/vl_rotate.c
+++ b/fs/afs/vl_rotate.c
@@ -17,6 +17,8 @@
bool afs_begin_vlserver_operation(struct afs_vl_cursor *vc, struct afs_cell *cell,
struct key *key)
{
+ static atomic_t debug_ids;
+
memset(vc, 0, sizeof(*vc));
vc->cell = cell;
vc->key = key;
@@ -29,6 +31,7 @@ bool afs_begin_vlserver_operation(struct afs_vl_cursor *vc, struct afs_cell *cel
return false;
}
+ vc->debug_id = atomic_inc_return(&debug_ids);
return true;
}
@@ -78,8 +81,8 @@ static bool afs_start_vl_iteration(struct afs_vl_cursor *vc)
if (!vc->server_list->nr_servers)
return false;
- vc->untried = (1UL << vc->server_list->nr_servers) - 1;
- vc->index = -1;
+ vc->untried_servers = (1UL << vc->server_list->nr_servers) - 1;
+ vc->server_index = -1;
return true;
}
@@ -89,17 +92,18 @@ static bool afs_start_vl_iteration(struct afs_vl_cursor *vc)
*/
bool afs_select_vlserver(struct afs_vl_cursor *vc)
{
- struct afs_addr_list *alist;
+ struct afs_addr_list *alist = vc->alist;
struct afs_vlserver *vlserver;
+ unsigned long set, failed;
unsigned int rtt;
s32 abort_code = vc->call_abort_code;
int error = vc->call_error, i;
vc->nr_iterations++;
- _enter("%lx[%d],%lx[%d],%d,%d",
- vc->untried, vc->index,
- vc->ac.tried, vc->ac.index,
+ _enter("VC=%x+%x,%d{%lx},%d{%lx},%d,%d",
+ vc->debug_id, vc->nr_iterations, vc->server_index, vc->untried_servers,
+ vc->addr_index, vc->addr_tried,
error, abort_code);
if (vc->flags & AFS_VL_CURSOR_STOP) {
@@ -110,6 +114,8 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
if (vc->nr_iterations == 0)
goto start;
+ WRITE_ONCE(alist->addrs[vc->addr_index].last_error, error);
+
/* Evaluate the result of the previous operation, if there was one. */
switch (error) {
default:
@@ -131,7 +137,7 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
/* The server went weird. */
afs_prioritise_error(&vc->cumul_error, -EREMOTEIO, abort_code);
//write_lock(&vc->cell->vl_servers_lock);
- //vc->server_list->weird_mask |= 1 << vc->index;
+ //vc->server_list->weird_mask |= 1 << vc->server_index;
//write_unlock(&vc->cell->vl_servers_lock);
goto next_server;
@@ -165,7 +171,13 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
restart_from_beginning:
_debug("restart");
- afs_end_cursor(&vc->ac);
+ if (vc->call_responded &&
+ vc->addr_index != vc->alist->preferred &&
+ test_bit(alist->preferred, &vc->addr_tried))
+ WRITE_ONCE(alist->preferred, vc->addr_index);
+ afs_put_addrlist(alist, afs_alist_trace_put_vlrotate_restart);
+ alist = vc->alist = NULL;
+
afs_put_vlserverlist(vc->cell->net, vc->server_list);
vc->server_list = NULL;
if (vc->flags & AFS_VL_CURSOR_RETRIED)
@@ -173,6 +185,7 @@ restart_from_beginning:
vc->flags |= AFS_VL_CURSOR_RETRIED;
start:
_debug("start");
+ ASSERTCMP(alist, ==, NULL);
if (!afs_start_vl_iteration(vc))
goto failed;
@@ -184,46 +197,46 @@ start:
}
pick_server:
- _debug("pick [%lx]", vc->untried);
+ _debug("pick [%lx]", vc->untried_servers);
+ ASSERTCMP(alist, ==, NULL);
- error = afs_wait_for_vl_probes(vc->server_list, vc->untried);
+ error = afs_wait_for_vl_probes(vc->server_list, vc->untried_servers);
if (error < 0) {
afs_prioritise_error(&vc->cumul_error, error, 0);
goto failed;
}
/* Pick the untried server with the lowest RTT. */
- vc->index = vc->server_list->preferred;
- if (test_bit(vc->index, &vc->untried))
+ vc->server_index = vc->server_list->preferred;
+ if (test_bit(vc->server_index, &vc->untried_servers))
goto selected_server;
- vc->index = -1;
+ vc->server_index = -1;
rtt = UINT_MAX;
for (i = 0; i < vc->server_list->nr_servers; i++) {
struct afs_vlserver *s = vc->server_list->servers[i].server;
- if (!test_bit(i, &vc->untried) ||
+ if (!test_bit(i, &vc->untried_servers) ||
!test_bit(AFS_VLSERVER_FL_RESPONDING, &s->flags))
continue;
- if (s->probe.rtt < rtt) {
- vc->index = i;
+ if (s->probe.rtt <= rtt) {
+ vc->server_index = i;
rtt = s->probe.rtt;
}
}
- if (vc->index == -1)
+ if (vc->server_index == -1)
goto no_more_servers;
selected_server:
- _debug("use %d", vc->index);
- __clear_bit(vc->index, &vc->untried);
+ _debug("use %d", vc->server_index);
+ __clear_bit(vc->server_index, &vc->untried_servers);
/* We're starting on a different vlserver from the list. We need to
* check it, find its address list and probe its capabilities before we
* use it.
*/
- ASSERTCMP(vc->ac.alist, ==, NULL);
- vlserver = vc->server_list->servers[vc->index].server;
+ vlserver = vc->server_list->servers[vc->server_index].server;
vc->server = vlserver;
_debug("USING VLSERVER: %s", vlserver->name);
@@ -231,35 +244,48 @@ selected_server:
read_lock(&vlserver->lock);
alist = rcu_dereference_protected(vlserver->addresses,
lockdep_is_held(&vlserver->lock));
- afs_get_addrlist(alist);
+ vc->alist = afs_get_addrlist(alist, afs_alist_trace_get_vlrotate_set);
read_unlock(&vlserver->lock);
- memset(&vc->ac, 0, sizeof(vc->ac));
-
- if (!vc->ac.alist)
- vc->ac.alist = alist;
- else
- afs_put_addrlist(alist);
-
- vc->ac.index = -1;
+ vc->addr_tried = 0;
+ vc->addr_index = -1;
iterate_address:
- ASSERT(vc->ac.alist);
/* Iterate over the current server's address list to try and find an
* address on which it will respond to us.
*/
- if (!afs_iterate_addresses(&vc->ac))
+ set = READ_ONCE(alist->responded);
+ failed = READ_ONCE(alist->probe_failed);
+ vc->addr_index = READ_ONCE(alist->preferred);
+
+ _debug("%lx-%lx-%lx,%d", set, failed, vc->addr_tried, vc->addr_index);
+
+ set &= ~(failed | vc->addr_tried);
+
+ if (!set)
goto next_server;
- _debug("VL address %d/%d", vc->ac.index, vc->ac.alist->nr_addrs);
+ if (!test_bit(vc->addr_index, &set))
+ vc->addr_index = __ffs(set);
+
+ set_bit(vc->addr_index, &vc->addr_tried);
+ vc->alist = alist;
+
+ _debug("VL address %d/%d", vc->addr_index, alist->nr_addrs);
vc->call_responded = false;
- _leave(" = t %pISpc", rxrpc_kernel_remote_addr(vc->ac.alist->addrs[vc->ac.index].peer));
+ _leave(" = t %pISpc", rxrpc_kernel_remote_addr(alist->addrs[vc->addr_index].peer));
return true;
next_server:
_debug("next");
- afs_end_cursor(&vc->ac);
+ ASSERT(alist);
+ if (vc->call_responded &&
+ vc->addr_index != alist->preferred &&
+ test_bit(alist->preferred, &vc->addr_tried))
+ WRITE_ONCE(alist->preferred, vc->addr_index);
+ afs_put_addrlist(alist, afs_alist_trace_put_vlrotate_next);
+ alist = vc->alist = NULL;
goto pick_server;
no_more_servers:
@@ -279,8 +305,15 @@ no_more_servers:
}
failed:
+ if (alist) {
+ if (vc->call_responded &&
+ vc->addr_index != alist->preferred &&
+ test_bit(alist->preferred, &vc->addr_tried))
+ WRITE_ONCE(alist->preferred, vc->addr_index);
+ afs_put_addrlist(alist, afs_alist_trace_put_vlrotate_fail);
+ alist = vc->alist = NULL;
+ }
vc->flags |= AFS_VL_CURSOR_STOP;
- afs_end_cursor(&vc->ac);
_leave(" = f [failed %d]", vc->cumul_error.error);
return false;
}
@@ -304,8 +337,8 @@ static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
pr_notice("DNS: src=%u st=%u lc=%x\n",
cell->dns_source, cell->dns_status, cell->dns_lookup_count);
pr_notice("VC: ut=%lx ix=%u ni=%hu fl=%hx err=%hd\n",
- vc->untried, vc->index, vc->nr_iterations, vc->flags,
- vc->cumul_error.error);
+ vc->untried_servers, vc->server_index, vc->nr_iterations,
+ vc->flags, vc->cumul_error.error);
pr_notice("VC: call er=%d ac=%d r=%u\n",
vc->call_error, vc->call_abort_code, vc->call_responded);
@@ -324,15 +357,14 @@ static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
a->nr_ipv4, a->nr_addrs, a->max_addrs,
a->preferred);
pr_notice("VC: - R=%lx F=%lx\n",
- a->responded, a->failed);
- if (a == vc->ac.alist)
+ a->responded, a->probe_failed);
+ if (a == vc->alist)
pr_notice("VC: - current\n");
}
}
}
- pr_notice("AC: t=%lx ax=%u ni=%u\n",
- vc->ac.tried, vc->ac.index, vc->ac.nr_iterations);
+ pr_notice("AC: t=%lx ax=%u\n", vc->addr_tried, vc->addr_index);
rcu_read_unlock();
}
@@ -343,6 +375,8 @@ int afs_end_vlserver_operation(struct afs_vl_cursor *vc)
{
struct afs_net *net = vc->cell->net;
+ _enter("VC=%x+%x", vc->debug_id, vc->nr_iterations);
+
switch (vc->cumul_error.error) {
case -EDESTADDRREQ:
case -EADDRNOTAVAIL:
@@ -352,7 +386,14 @@ int afs_end_vlserver_operation(struct afs_vl_cursor *vc)
break;
}
- afs_end_cursor(&vc->ac);
+ if (vc->alist) {
+ if (vc->call_responded &&
+ vc->addr_index != vc->alist->preferred &&
+ test_bit(vc->alist->preferred, &vc->addr_tried))
+ WRITE_ONCE(vc->alist->preferred, vc->addr_index);
+ afs_put_addrlist(vc->alist, afs_alist_trace_put_vlrotate_end);
+ vc->alist = NULL;
+ }
afs_put_vlserverlist(net, vc->server_list);
return vc->cumul_error.error;
}