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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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16
fs/afs/volume.c
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@@ -82,22 +82,6 @@ static struct afs_vldb_entry *afs_vl_lookup_vldb(struct afs_cell *cell,
return ERR_PTR(-ERESTARTSYS);
while (afs_select_vlserver(&vc)) {
if (!test_bit(vc.ac.index, &vc.ac.alist->probed)) {
ret = afs_vl_get_capabilities(cell->net, &vc.ac, key);
switch (ret) {
case VL_SERVICE:
clear_bit(vc.ac.index, &vc.ac.alist->yfs);
set_bit(vc.ac.index, &vc.ac.alist->probed);
vc.ac.alist->addrs[vc.ac.index].srx_service = ret;
break;
case YFS_VL_SERVICE:
set_bit(vc.ac.index, &vc.ac.alist->yfs);
set_bit(vc.ac.index, &vc.ac.alist->probed);
vc.ac.alist->addrs[vc.ac.index].srx_service = ret;
break;
}
}
vldb = afs_vl_get_entry_by_name_u(&vc, volname, volnamesz);
}