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authorJ. Bruce Fields <bfields@citi.umich.edu>2007-11-23 22:26:18 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-02-01 16:42:06 -0500
commit404ec117be5d36e1a4c4582d0c518594333e32df (patch)
treecdae7b67f896c93130a6a669ca65cffc94079b07
parent35bba9a37e68c68a820a1a772f016255c0838f79 (diff)
nfsd4: recognize callback channel failure earlier
When the callback channel fails, we inform the client of that by returning a cb_path_down error the next time it tries to renew its lease. If we wait most of a lease period before deciding that a callback has failed and that the callback channel is down, then we decrease the chances that the client will find out in time to do anything about it. So, mark the channel down as soon as we recognize that an rpc has failed. However, continue trying to recall delegations anyway, in hopes it will come back up. This will prevent more delegations from being given out, and ensure cb_path_down is returned to renew calls earlier, while still making the best effort to deliver recalls of existing delegations. Also fix a couple comments and remove a dprink that doesn't seem likely to be useful. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
-rw-r--r--fs/nfsd/nfs4callback.c13
-rw-r--r--fs/nfsd/nfs4state.c5
2 files changed, 9 insertions, 9 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 6eb5cd2381a..aae2b29ae2c 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -457,9 +457,6 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
int retries = 1;
int status = 0;
- if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
- return;
-
cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
cbr->cbr_dp = dp;
@@ -468,6 +465,7 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
switch (status) {
case -EIO:
/* Network partition? */
+ atomic_set(&clp->cl_callback.cb_set, 0);
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/* Race: client probably got cb_recall
@@ -480,11 +478,10 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
}
out_put_cred:
- if (status == -EIO)
- atomic_set(&clp->cl_callback.cb_set, 0);
- /* Success or failure, now we're either waiting for lease expiration
- * or deleg_return. */
- dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count));
+ /*
+ * Success or failure, now we're either waiting for lease expiration
+ * or deleg_return.
+ */
put_nfs4_client(clp);
nfs4_put_delegation(dp);
return;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b9d395856b3..11aa4b6b4fa 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -361,8 +361,11 @@ shutdown_callback_client(struct nfs4_client *clp)
{
struct rpc_clnt *clnt = clp->cl_callback.cb_client;
- /* shutdown rpc client, ending any outstanding recall rpcs */
if (clnt) {
+ /*
+ * Callback threads take a reference on the client, so there
+ * should be no outstanding callbacks at this point.
+ */
clp->cl_callback.cb_client = NULL;
rpc_shutdown_client(clnt);
}