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afs: Expose information from afs_vlserver through /proc for debugging

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Convert various bitfields in afs_vlserver::probe to a mask and then expose
this and some other bits of information through /proc/net/afs/<cell>/vlservers
to make it easier to debug VL server communication issues.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2020-08-20 15:01:54 +01:00
parent 4f4c2c05eb
commit fb72cd3d48
4 changed files with 22 additions and 15 deletions
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9
fs/afs/internal.h
View File

@ -412,10 +412,11 @@ struct afs_vlserver {
unsigned int rtt; /* RTT as ktime/64 */
u32 abort_code;
short error;
bool responded:1;
bool is_yfs:1;
bool not_yfs:1;
bool local_failure:1;
unsigned short flags;
#define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
#define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
#define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
#define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
} probe;
u16 port;

5
fs/afs/proc.c
View File

@ -310,6 +310,11 @@ static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
alist->preferred == i ? '>' : '-',
&alist->addrs[i].transport);
}
seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->probe.rtt);
seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
vlserver->probe.flags, vlserver->probe.error,
vlserver->probe.abort_code,
atomic_read(&vlserver->probe_outstanding));
return 0;
}

20
fs/afs/vl_probe.c
View File

@ -45,14 +45,14 @@ void afs_vlserver_probe_result(struct afs_call *call)
server->probe.error = 0;
goto responded;
case -ECONNABORTED:
if (!server->probe.responded) {
if (!(server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED)) {
server->probe.abort_code = call->abort_code;
server->probe.error = ret;
}
goto responded;
case -ENOMEM:
case -ENONET:
server->probe.local_failure = true;
server->probe.flags |= AFS_VLSERVER_PROBE_LOCAL_FAILURE;
afs_io_error(call, afs_io_error_vl_probe_fail);
goto out;
case -ECONNRESET: /* Responded, but call expired. */
@ -67,7 +67,7 @@ void afs_vlserver_probe_result(struct afs_call *call)
default:
clear_bit(index, &alist->responded);
set_bit(index, &alist->failed);
if (!server->probe.responded &&
if (!(server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED) &&
(server->probe.error == 0 ||
server->probe.error == -ETIMEDOUT ||
server->probe.error == -ETIME))
@ -81,12 +81,12 @@ responded:
clear_bit(index, &alist->failed);
if (call->service_id == YFS_VL_SERVICE) {
server->probe.is_yfs = true;
server->probe.flags |= AFS_VLSERVER_PROBE_IS_YFS;
set_bit(AFS_VLSERVER_FL_IS_YFS, &server->flags);
alist->addrs[index].srx_service = call->service_id;
} else {
server->probe.not_yfs = true;
if (!server->probe.is_yfs) {
server->probe.flags |= AFS_VLSERVER_PROBE_NOT_YFS;
if (!(server->probe.flags & AFS_VLSERVER_PROBE_IS_YFS)) {
clear_bit(AFS_VLSERVER_FL_IS_YFS, &server->flags);
alist->addrs[index].srx_service = call->service_id;
}
@ -100,7 +100,7 @@ responded:
}
smp_wmb(); /* Set rtt before responded. */
server->probe.responded = true;
server->probe.flags |= AFS_VLSERVER_PROBE_RESPONDED;
set_bit(AFS_VLSERVER_FL_PROBED, &server->flags);
out:
spin_unlock(&server->probe_lock);
@ -202,7 +202,7 @@ int afs_wait_for_vl_probes(struct afs_vlserver_list *vllist,
server = vllist->servers[i].server;
if (!test_bit(AFS_VLSERVER_FL_PROBING, &server->flags))
__clear_bit(i, &untried);
if (server->probe.responded)
if (server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED)
have_responders = true;
}
}
@ -228,7 +228,7 @@ int afs_wait_for_vl_probes(struct afs_vlserver_list *vllist,
for (i = 0; i < vllist->nr_servers; i++) {
if (test_bit(i, &untried)) {
server = vllist->servers[i].server;
if (server->probe.responded)
if (server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED)
goto stop;
if (test_bit(AFS_VLSERVER_FL_PROBING, &server->flags))
still_probing = true;
@ -246,7 +246,7 @@ stop:
for (i = 0; i < vllist->nr_servers; i++) {
if (test_bit(i, &untried)) {
server = vllist->servers[i].server;
if (server->probe.responded &&
if ((server->probe.flags & AFS_VLSERVER_PROBE_RESPONDED) &&
server->probe.rtt < rtt) {
pref = i;
rtt = server->probe.rtt;

3
fs/afs/vl_rotate.c
View File

@ -192,7 +192,8 @@ pick_server:
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) || !s->probe.responded)
if (!test_bit(i, &vc->untried) ||
!(s->probe.flags & AFS_VLSERVER_PROBE_RESPONDED))
continue;
if (s->probe.rtt < rtt) {
vc->index = i;