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nfsd: give up on CB_LAYOUTRECALLs after two lease periods

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Have the CB_LAYOUTRECALL code treat NFS4_OK and NFS4ERR_DELAY returns
equivalently. Change the code to periodically resend CB_LAYOUTRECALLS
until the ls_layouts list is empty or the client returns a different
error code.

If we go for two lease periods without the list being emptied or the
client sending a hard error, then we give up and clean out the list
anyway.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Tested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2015-12-08 07:23:48 -05:00 committed by J. Bruce Fields
parent 691412b443
commit 6b9b21073d
1 changed files with 25 additions and 10 deletions
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35
fs/nfsd/nfs4layouts.c
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@ -623,24 +623,39 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
{
struct nfs4_layout_stateid *ls =
container_of(cb, struct nfs4_layout_stateid, ls_recall);
struct nfsd_net *nn;
ktime_t now, cutoff;
LIST_HEAD(reaplist);
switch (task->tk_status) {
case 0:
return 1;
case -NFS4ERR_DELAY:
/*
* Anything left? If not, then call it done. Note that we don't
* take the spinlock since this is an optimization and nothing
* should get added until the cb counter goes to zero.
*/
if (list_empty(&ls->ls_layouts))
return 1;
/* Poll the client until it's done with the layout */
now = ktime_get();
nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
/* Client gets 2 lease periods to return it */
cutoff = ktime_add_ns(task->tk_start,
nn->nfsd4_lease * NSEC_PER_SEC * 2);
if (ktime_before(now, cutoff)) {
rpc_delay(task, HZ/100); /* 10 mili-seconds */
return 0;
}
/* Fallthrough */
case -NFS4ERR_NOMATCHING_LAYOUT:
trace_layout_recall_done(&ls->ls_stid.sc_stateid);
task->tk_status = 0;
return 1;
case -NFS4ERR_DELAY:
/* Poll the client until it's done with the layout */
/* FIXME: cap number of retries.
* The pnfs standard states that we need to only expire
* the client after at-least "lease time" .eg lease-time * 2
* when failing to communicate a recall
*/
rpc_delay(task, HZ/100); /* 10 mili-seconds */
return 0;
default:
/*
* Unknown error or non-responding client, we'll need to fence.