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authorDavid Howells <dhowells@redhat.com>2023-10-30 11:53:16 +0000
committerDavid Howells <dhowells@redhat.com>2024-01-01 16:37:27 +0000
commite6a7d7f71b17e0a44e2155bdad47eae7b5368503 (patch)
tree6279edcf2624cc9abcb55f15b1251828530ec195 /fs/afs
parent92f091cdddace38e57ad570663b058a38b4d8bed (diff)
afs: Dispatch vlserver probes in priority order
When probing all the addresses for a volume location server, dispatch them in order of descending priority to try and get back highest priority one first. Also add a tracepoint to show the transmission and completion of the probes. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
Diffstat (limited to 'fs/afs')
-rw-r--r--fs/afs/internal.h1
-rw-r--r--fs/afs/vl_list.c2
-rw-r--r--fs/afs/vl_probe.c20
3 files changed, 21 insertions, 2 deletions
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 9a1e151e77e7..88db04220773 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -447,6 +447,7 @@ struct afs_vlserver {
rwlock_t lock; /* Lock on addresses */
refcount_t ref;
unsigned int rtt; /* Server's current RTT in uS */
+ unsigned int debug_id;
/* Probe state */
wait_queue_head_t probe_wq;
diff --git a/fs/afs/vl_list.c b/fs/afs/vl_list.c
index 5c4cd71caccf..9b1c20daac53 100644
--- a/fs/afs/vl_list.c
+++ b/fs/afs/vl_list.c
@@ -13,6 +13,7 @@ struct afs_vlserver *afs_alloc_vlserver(const char *name, size_t name_len,
unsigned short port)
{
struct afs_vlserver *vlserver;
+ static atomic_t debug_ids;
vlserver = kzalloc(struct_size(vlserver, name, name_len + 1),
GFP_KERNEL);
@@ -21,6 +22,7 @@ struct afs_vlserver *afs_alloc_vlserver(const char *name, size_t name_len,
rwlock_init(&vlserver->lock);
init_waitqueue_head(&vlserver->probe_wq);
spin_lock_init(&vlserver->probe_lock);
+ vlserver->debug_id = atomic_inc_return(&debug_ids);
vlserver->rtt = UINT_MAX;
vlserver->name_len = name_len;
vlserver->service_id = VL_SERVICE;
diff --git a/fs/afs/vl_probe.c b/fs/afs/vl_probe.c
index f868ae5d40e5..b128dc3d8af7 100644
--- a/fs/afs/vl_probe.c
+++ b/fs/afs/vl_probe.c
@@ -131,6 +131,7 @@ responded:
out:
spin_unlock(&server->probe_lock);
+ trace_afs_vl_probe(server, false, alist, index, call->error, call->abort_code, rtt_us);
_debug("probe [%u][%u] %pISpc rtt=%d ret=%d",
server_index, index, rxrpc_kernel_remote_addr(addr->peer),
rtt_us, ret);
@@ -150,8 +151,10 @@ static bool afs_do_probe_vlserver(struct afs_net *net,
{
struct afs_addr_list *alist;
struct afs_call *call;
- unsigned int index;
+ unsigned long unprobed;
+ unsigned int index, i;
bool in_progress = false;
+ int best_prio;
_enter("%s", server->name);
@@ -165,7 +168,20 @@ static bool afs_do_probe_vlserver(struct afs_net *net,
memset(&server->probe, 0, sizeof(server->probe));
server->probe.rtt = UINT_MAX;
- for (index = 0; index < alist->nr_addrs; index++) {
+ unprobed = (1UL << alist->nr_addrs) - 1;
+ while (unprobed) {
+ best_prio = -1;
+ index = 0;
+ for (i = 0; i < alist->nr_addrs; i++) {
+ if (test_bit(i, &unprobed) &&
+ alist->addrs[i].prio > best_prio) {
+ index = i;
+ best_prio = alist->addrs[i].prio;
+ }
+ }
+ __clear_bit(index, &unprobed);
+
+ trace_afs_vl_probe(server, true, alist, index, 0, 0, 0);
call = afs_vl_get_capabilities(net, alist, index, key, server,
server_index);
if (!IS_ERR(call)) {