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afs: Probe multiple fileservers simultaneously

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Send probes to all the unprobed fileservers in a fileserver list on all
addresses simultaneously in an attempt to find out the fastest route whilst
not getting stuck for 20s on any server or address that we don't get a
reply from.

This alleviates the problem whereby attempting to access a new server can
take a long time because the rotation algorithm ends up rotating through
all servers and addresses until it finds one that responds.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-10-20 00:57:59 +01:00
parent 18ac61853c
commit 3bf0fb6f33
17 changed files with 1050 additions and 350 deletions
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6
fs/afs/vl_list.c
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@@ -23,6 +23,8 @@ struct afs_vlserver *afs_alloc_vlserver(const char *name, size_t name_len,
if (vlserver) {
atomic_set(&vlserver->usage, 1);
rwlock_init(&vlserver->lock);
init_waitqueue_head(&vlserver->probe_wq);
spin_lock_init(&vlserver->probe_lock);
vlserver->name_len = name_len;
vlserver->port = port;
memcpy(vlserver->name, name, name_len);
@@ -141,7 +143,7 @@ static struct afs_addr_list *afs_extract_vl_addrs(const u8 **_b, const u8 *end,
/* Start with IPv6 if available. */
if (alist->nr_ipv4 < alist->nr_addrs)
alist->index = alist->nr_ipv4;
alist->preferred = alist->nr_ipv4;
*_b = b;
return alist;
@@ -307,6 +309,8 @@ struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *cell,
(vllist->nr_servers - j) * sizeof(struct afs_vlserver_entry));
}
clear_bit(AFS_VLSERVER_FL_PROBED, &server->flags);
vllist->servers[j].priority = bs.priority;
vllist->servers[j].weight = bs.weight;
vllist->servers[j].server = server;