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afs: Allow dumping of server cursor on operation failure

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Provide an option to allow the file or volume location server cursor to be
dumped if the rotation routine falls off the end without managing to
contact a server.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-10-20 00:57:58 +01:00
parent 30062bd13e
commit 744bcd713a
5 changed files with 127 additions and 0 deletions
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53
fs/afs/vl_rotate.c
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@@ -83,6 +83,8 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
return false;
}
vc->nr_iterations++;
/* Evaluate the result of the previous operation, if there was one. */
switch (error) {
case SHRT_MAX:
@@ -234,6 +236,52 @@ failed:
return false;
}
/*
* Dump cursor state in the case of the error being EDESTADDRREQ.
*/
static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
{
static int count;
int i;
if (!IS_ENABLED(CONFIG_AFS_DEBUG_CURSOR) || count > 3)
return;
count++;
rcu_read_lock();
pr_notice("EDESTADDR occurred\n");
pr_notice("VC: st=%u ix=%u ni=%hu fl=%hx err=%hd\n",
vc->start, vc->index, vc->nr_iterations, vc->flags, vc->error);
if (vc->server_list) {
const struct afs_vlserver_list *sl = vc->server_list;
pr_notice("VC: SL nr=%u ix=%u\n",
sl->nr_servers, sl->index);
for (i = 0; i < sl->nr_servers; i++) {
const struct afs_vlserver *s = sl->servers[i].server;
pr_notice("VC: server fl=%lx %s+%hu\n",
s->flags, s->name, s->port);
if (s->addresses) {
const struct afs_addr_list *a =
rcu_dereference(s->addresses);
pr_notice("VC: - av=%u nr=%u/%u/%u ax=%u\n",
a->version,
a->nr_ipv4, a->nr_addrs, a->max_addrs,
a->index);
pr_notice("VC: - pr=%lx yf=%lx\n",
a->probed, a->yfs);
if (a == vc->ac.alist)
pr_notice("VC: - current\n");
}
}
}
pr_notice("AC: as=%u ax=%u ac=%d er=%d b=%u r=%u ni=%hu\n",
vc->ac.start, vc->ac.index, vc->ac.abort_code, vc->ac.error,
vc->ac.begun, vc->ac.responded, vc->ac.nr_iterations);
rcu_read_unlock();
}
/*
* Tidy up a volume location server cursor and unlock the vnode.
*/
@@ -241,6 +289,11 @@ int afs_end_vlserver_operation(struct afs_vl_cursor *vc)
{
struct afs_net *net = vc->cell->net;
if (vc->error == -EDESTADDRREQ ||
vc->error == -ENETUNREACH ||
vc->error == -EHOSTUNREACH)
afs_vl_dump_edestaddrreq(vc);
afs_end_cursor(&vc->ac);
afs_put_vlserverlist(net, vc->server_list);