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nfsd: update callback done processing 

Instead of having the convention where individual nfsd4_callback_ops->done
operations return -1 to indicate the callback path is down, move the check
to nfsd4_cb_done.  Only mark the callback path down on transport-level
errors, not NFS-level errors.

The existing logic causes the server to set SEQ4_STATUS_CB_PATH_DOWN
just because the client returned an error to a CB_RECALL for a
delegation that the client had already done a FREE_STATEID for.  But
clearly that error doesn't mean that there's anything wrong with the
backchannel.

Additionally, handle NFS4ERR_DELAY in nfsd4_cb_recall_done.  The client
returns NFS4ERR_DELAY if it is already in the process of returning the
delegation.

Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Scott Mayhew 2019-05-02 13:32:12 -04:00 committed by J. Bruce Fields
parent 5926459e7c
commit 1c73b9d24f
3 changed files with 10 additions and 6 deletions
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7
fs/nfsd/nfs4callback.c
View File

@ -1122,10 +1122,11 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
rpc_restart_call_prepare(task);
return;
case 1:
break;
case -1:
/* Network partition? */
switch (task->tk_status) {
case -EIO:
case -ETIMEDOUT:
nfsd4_mark_cb_down(clp, task->tk_status);
}
break;
default:
BUG();

2
fs/nfsd/nfs4layouts.c
View File

@ -693,7 +693,7 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
ops->fence_client(ls);
else
nfsd4_cb_layout_fail(ls);
return -1;
return 1;
case -NFS4ERR_NOMATCHING_LAYOUT:
trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);
task->tk_status = 0;

5
fs/nfsd/nfs4state.c
View File

@ -3970,6 +3970,9 @@ static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
switch (task->tk_status) {
case 0:
return 1;
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/*
@ -3982,7 +3985,7 @@ static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
}
/*FALLTHRU*/
default:
return -1;
return 1;
}
}