NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals

Currently, each time nfs4_do_fsinfo() is called it will do an implicit
NFS4 lease renewal, which is not compliant with the NFS4 specification.
This can result in a lease being expired by an NFS server.

Commit 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases")
introduced implicit client lease renewal in nfs4_do_fsinfo(),
which can result in the NFSv4.0 lease to expire on a server side,
and servers returning NFS4ERR_EXPIRED or NFS4ERR_STALE_CLIENTID.

This can easily be reproduced by frequently unmounting a sub-mount,
then stat'ing it to get it mounted again, which will delay or even
completely prevent client from sending RENEW operations if no other
NFS operations are issued. Eventually nfs server will expire client's
lease and return an error on file access or next RENEW.

This can also happen when a sub-mount is automatically unmounted
due to inactivity (after nfs_mountpoint_expiry_timeout), then it is
mounted again via stat(). This can result in a short window during
which client's lease will expire on a server but not on a client.
This specific case was observed on production systems.

This patch removes the implicit lease renewal from nfs4_do_fsinfo().

Fixes: 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases")
Signed-off-by: Robert Milkowski <rmilkowski@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index c3e669dcee0ea0d3753516e863422b893d7632b6..8be1ba7c62bb8f4074dff6ab98609b357d793f3d 100644 (file)
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -447,9 +447,7 @@ extern void nfs4_schedule_state_renewal(struct nfs_client *);
 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 extern void nfs4_kill_renewd(struct nfs_client *);
 extern void nfs4_renew_state(struct work_struct *);
-extern void nfs4_set_lease_period(struct nfs_client *clp,
-               unsigned long lease,
-               unsigned long lastrenewed);
+extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 
 
 /* nfs4state.c */

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index a4ace14756ac36c519ae14d0cc595f128a63436e..95d07a3dc5d1d8b350c1d017b509e710bd31120b 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5053,16 +5053,13 @@ static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, str
        struct nfs4_exception exception = {
                .interruptible = true,
        };
-       unsigned long now = jiffies;
        int err;
 
        do {
                err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
                trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
                if (err == 0) {
-                       nfs4_set_lease_period(server->nfs_client,
-                                       fsinfo->lease_time * HZ,
-                                       now);
+                       nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
                        break;
                }
                err = nfs4_handle_exception(server, err, &exception);
@@ -6126,6 +6123,7 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
                .callback_data = &setclientid,
                .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
        };
+       unsigned long now = jiffies;
        int status;
 
        /* nfs_client_id4 */
@@ -6158,6 +6156,9 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
                clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
                put_rpccred(setclientid.sc_cred);
        }
+
+       if (status == 0)
+               do_renew_lease(clp, now);
 out:
        trace_nfs4_setclientid(clp, status);
        dprintk("NFS reply setclientid: %d\n", status);
@@ -8245,6 +8246,7 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cre
        struct rpc_task *task;
        struct nfs41_exchange_id_args *argp;
        struct nfs41_exchange_id_res *resp;
+       unsigned long now = jiffies;
        int status;
 
        task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
@@ -8265,6 +8267,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cre
        if (status != 0)
                goto out;
 
+       do_renew_lease(clp, now);
+
        clp->cl_clientid = resp->clientid;
        clp->cl_exchange_flags = resp->flags;
        clp->cl_seqid = resp->seqid;

diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
index 6ea431b067dd6f7df986c1ca6277be85d58e2612..ff876dda7f063c79991514fd9e0d0ebd1efad649 100644 (file)
--- a/fs/nfs/nfs4renewd.c
+++ b/fs/nfs/nfs4renewd.c
@@ -138,15 +138,12 @@ nfs4_kill_renewd(struct nfs_client *clp)
  *
  * @clp: pointer to nfs_client
  * @lease: new value for lease period
- * @lastrenewed: time at which lease was last renewed
  */
 void nfs4_set_lease_period(struct nfs_client *clp,
-               unsigned long lease,
-               unsigned long lastrenewed)
+               unsigned long lease)
 {
        spin_lock(&clp->cl_lock);
        clp->cl_lease_time = lease;
-       clp->cl_last_renewal = lastrenewed;
        spin_unlock(&clp->cl_lock);
 
        /* Cap maximum reconnect timeout at 1/2 lease period */

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 19b473bc560e8bc357bc3da399f455eaee7158d2..f7723d221945b7aa7d9f629014a49e6d61e632e2 100644 (file)
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -92,17 +92,15 @@ static int nfs4_setup_state_renewal(struct nfs_client *clp)
 {
        int status;
        struct nfs_fsinfo fsinfo;
-       unsigned long now;
 
        if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
                nfs4_schedule_state_renewal(clp);
                return 0;
        }
 
-       now = jiffies;
        status = nfs4_proc_get_lease_time(clp, &fsinfo);
        if (status == 0) {
-               nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
+               nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
                nfs4_schedule_state_renewal(clp);
        }