NFSv4: Don't tell server we rebooted when not necessary
[safe/jmp/linux-2.6] / fs / nfs / nfs4state.c
index 523cc2c..a780518 100644 (file)
@@ -71,7 +71,28 @@ static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
        return status;
 }
 
-struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
+static struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
+{
+       struct rpc_cred *cred = NULL;
+
+       if (clp->cl_machine_cred != NULL)
+               cred = get_rpccred(clp->cl_machine_cred);
+       return cred;
+}
+
+static void nfs4_clear_machine_cred(struct nfs_client *clp)
+{
+       struct rpc_cred *cred;
+
+       spin_lock(&clp->cl_lock);
+       cred = clp->cl_machine_cred;
+       clp->cl_machine_cred = NULL;
+       spin_unlock(&clp->cl_lock);
+       if (cred != NULL)
+               put_rpccred(cred);
+}
+
+struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 {
        struct nfs4_state_owner *sp;
        struct rb_node *pos;
@@ -87,17 +108,34 @@ struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
        return cred;
 }
 
+static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
+{
+       struct rpc_cred *cred;
+
+       spin_lock(&clp->cl_lock);
+       cred = nfs4_get_renew_cred_locked(clp);
+       spin_unlock(&clp->cl_lock);
+       return cred;
+}
+
 static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 {
        struct nfs4_state_owner *sp;
        struct rb_node *pos;
+       struct rpc_cred *cred;
 
+       spin_lock(&clp->cl_lock);
+       cred = nfs4_get_machine_cred_locked(clp);
+       if (cred != NULL)
+               goto out;
        pos = rb_first(&clp->cl_state_owners);
        if (pos != NULL) {
                sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
-               return get_rpccred(sp->so_cred);
+               cred = get_rpccred(sp->so_cred);
        }
-       return NULL;
+out:
+       spin_unlock(&clp->cl_lock);
+       return cred;
 }
 
 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
@@ -156,8 +194,9 @@ static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
 }
 
 static struct nfs4_state_owner *
-nfs4_find_state_owner(struct nfs_client *clp, struct rpc_cred *cred)
+nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 {
+       struct nfs_client *clp = server->nfs_client;
        struct rb_node **p = &clp->cl_state_owners.rb_node,
                       *parent = NULL;
        struct nfs4_state_owner *sp, *res = NULL;
@@ -166,6 +205,14 @@ nfs4_find_state_owner(struct nfs_client *clp, struct rpc_cred *cred)
                parent = *p;
                sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 
+               if (server < sp->so_server) {
+                       p = &parent->rb_left;
+                       continue;
+               }
+               if (server > sp->so_server) {
+                       p = &parent->rb_right;
+                       continue;
+               }
                if (cred < sp->so_cred)
                        p = &parent->rb_left;
                else if (cred > sp->so_cred)
@@ -190,6 +237,14 @@ nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
                parent = *p;
                sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 
+               if (new->so_server < sp->so_server) {
+                       p = &parent->rb_left;
+                       continue;
+               }
+               if (new->so_server > sp->so_server) {
+                       p = &parent->rb_right;
+                       continue;
+               }
                if (new->so_cred < sp->so_cred)
                        p = &parent->rb_left;
                else if (new->so_cred > sp->so_cred)
@@ -237,7 +292,7 @@ nfs4_alloc_state_owner(void)
        return sp;
 }
 
-void
+static void
 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 {
        if (!RB_EMPTY_NODE(&sp->so_client_node)) {
@@ -260,7 +315,7 @@ struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct
        struct nfs4_state_owner *sp, *new;
 
        spin_lock(&clp->cl_lock);
-       sp = nfs4_find_state_owner(clp, cred);
+       sp = nfs4_find_state_owner(server, cred);
        spin_unlock(&clp->cl_lock);
        if (sp != NULL)
                return sp;
@@ -268,14 +323,17 @@ struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct
        if (new == NULL)
                return NULL;
        new->so_client = clp;
+       new->so_server = server;
        new->so_cred = cred;
        spin_lock(&clp->cl_lock);
        sp = nfs4_insert_state_owner(clp, new);
        spin_unlock(&clp->cl_lock);
        if (sp == new)
                get_rpccred(cred);
-       else
+       else {
+               rpc_destroy_wait_queue(&new->so_sequence.wait);
                kfree(new);
+       }
        return sp;
 }
 
@@ -292,6 +350,7 @@ void nfs4_put_state_owner(struct nfs4_state_owner *sp)
                return;
        nfs4_remove_state_owner(clp, sp);
        spin_unlock(&clp->cl_lock);
+       rpc_destroy_wait_queue(&sp->so_sequence.wait);
        put_rpccred(cred);
        kfree(sp);
 }
@@ -323,8 +382,6 @@ nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode)
                else
                        list_move_tail(&state->open_states, &state->owner->so_states);
        }
-       if (mode == 0)
-               list_del_init(&state->inode_states);
        state->state = mode;
 }
 
@@ -397,8 +454,7 @@ void nfs4_put_open_state(struct nfs4_state *state)
        if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
                return;
        spin_lock(&inode->i_lock);
-       if (!list_empty(&state->inode_states))
-               list_del(&state->inode_states);
+       list_del(&state->inode_states);
        list_del(&state->open_states);
        spin_unlock(&inode->i_lock);
        spin_unlock(&owner->so_lock);
@@ -410,7 +466,7 @@ void nfs4_put_open_state(struct nfs4_state *state)
 /*
  * Close the current file.
  */
-void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
+static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait)
 {
        struct nfs4_state_owner *owner = state->owner;
        int call_close = 0;
@@ -451,7 +507,17 @@ void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
                nfs4_put_open_state(state);
                nfs4_put_state_owner(owner);
        } else
-               nfs4_do_close(path, state);
+               nfs4_do_close(path, state, wait);
+}
+
+void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode)
+{
+       __nfs4_close(path, state, mode, 0);
+}
+
+void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode)
+{
+       __nfs4_close(path, state, mode, 1);
 }
 
 /*
@@ -484,7 +550,10 @@ static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, f
        lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
        if (lsp == NULL)
                return NULL;
-       lsp->ls_seqid.sequence = &state->owner->so_sequence;
+       rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
+       spin_lock_init(&lsp->ls_sequence.lock);
+       INIT_LIST_HEAD(&lsp->ls_sequence.list);
+       lsp->ls_seqid.sequence = &lsp->ls_sequence;
        atomic_set(&lsp->ls_count, 1);
        lsp->ls_owner = fl_owner;
        spin_lock(&clp->cl_lock);
@@ -501,6 +570,7 @@ static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
        spin_lock(&clp->cl_lock);
        nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
        spin_unlock(&clp->cl_lock);
+       rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
        kfree(lsp);
 }
 
@@ -616,27 +686,26 @@ void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t f
 
 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
 {
-       struct rpc_sequence *sequence = counter->sequence;
        struct nfs_seqid *new;
 
        new = kmalloc(sizeof(*new), GFP_KERNEL);
        if (new != NULL) {
                new->sequence = counter;
-               spin_lock(&sequence->lock);
-               list_add_tail(&new->list, &sequence->list);
-               spin_unlock(&sequence->lock);
+               INIT_LIST_HEAD(&new->list);
        }
        return new;
 }
 
 void nfs_free_seqid(struct nfs_seqid *seqid)
 {
-       struct rpc_sequence *sequence = seqid->sequence->sequence;
+       if (!list_empty(&seqid->list)) {
+               struct rpc_sequence *sequence = seqid->sequence->sequence;
 
-       spin_lock(&sequence->lock);
-       list_del(&seqid->list);
-       spin_unlock(&sequence->lock);
-       rpc_wake_up(&sequence->wait);
+               spin_lock(&sequence->lock);
+               list_del(&seqid->list);
+               spin_unlock(&sequence->lock);
+               rpc_wake_up(&sequence->wait);
+       }
        kfree(seqid);
 }
 
@@ -647,6 +716,7 @@ void nfs_free_seqid(struct nfs_seqid *seqid)
  */
 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 {
+       BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
        switch (status) {
                case 0:
                        break;
@@ -654,8 +724,8 @@ static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
                        if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
                                return;
                        printk(KERN_WARNING "NFS: v4 server returned a bad"
-                                       "sequence-id error on an"
-                                       "unconfirmed sequence %p!\n",
+                                       " sequence-id error on an"
+                                       " unconfirmed sequence %p!\n",
                                        seqid->sequence);
                case -NFS4ERR_STALE_CLIENTID:
                case -NFS4ERR_STALE_STATEID:
@@ -698,15 +768,15 @@ int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
        struct rpc_sequence *sequence = seqid->sequence->sequence;
        int status = 0;
 
-       if (sequence->list.next == &seqid->list)
-               goto out;
        spin_lock(&sequence->lock);
-       if (sequence->list.next != &seqid->list) {
-               rpc_sleep_on(&sequence->wait, task, NULL, NULL);
-               status = -EAGAIN;
-       }
+       if (list_empty(&seqid->list))
+               list_add_tail(&seqid->list, &sequence->list);
+       if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
+               goto unlock;
+       rpc_sleep_on(&sequence->wait, task, NULL);
+       status = -EAGAIN;
+unlock:
        spin_unlock(&sequence->lock);
-out:
        return status;
 }
 
@@ -730,8 +800,9 @@ static void nfs4_recover_state(struct nfs_client *clp)
 
        __module_get(THIS_MODULE);
        atomic_inc(&clp->cl_count);
-       task = kthread_run(reclaimer, clp, "%u.%u.%u.%u-reclaim",
-                       NIPQUAD(clp->cl_addr.sin_addr));
+       task = kthread_run(reclaimer, clp, "%s-reclaim",
+                               rpc_peeraddr2str(clp->cl_rpcclient,
+                                                       RPC_DISPLAY_ADDR));
        if (!IS_ERR(task))
                return;
        nfs4_clear_recover_bit(clp);
@@ -746,20 +817,43 @@ void nfs4_schedule_state_recovery(struct nfs_client *clp)
 {
        if (!clp)
                return;
+       if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
+               set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
        if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
                nfs4_recover_state(clp);
 }
 
-static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_state *state)
+static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
+{
+
+       set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
+       /* Don't recover state that expired before the reboot */
+       if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
+               clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
+               return 0;
+       }
+       set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
+       return 1;
+}
+
+static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
+{
+       set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
+       clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
+       set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
+       return 1;
+}
+
+static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
 {
        struct inode *inode = state->inode;
        struct file_lock *fl;
        int status = 0;
 
-       for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
+       for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
                if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
                        continue;
-               if (((struct nfs_open_context *)fl->fl_file->private_data)->state != state)
+               if (nfs_file_open_context(fl->fl_file)->state != state)
                        continue;
                status = ops->recover_lock(state, fl);
                if (status >= 0)
@@ -767,7 +861,7 @@ static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops *ops, struct nfs4_s
                switch (status) {
                        default:
                                printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
-                                               __FUNCTION__, status);
+                                               __func__, status);
                        case -NFS4ERR_EXPIRED:
                        case -NFS4ERR_NO_GRACE:
                        case -NFS4ERR_RECLAIM_BAD:
@@ -783,7 +877,7 @@ out_err:
        return status;
 }
 
-static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct nfs4_state_owner *sp)
+static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
 {
        struct nfs4_state *state;
        struct nfs4_lock_state *lock;
@@ -798,27 +892,28 @@ static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct n
         * server that doesn't support a grace period.
         */
        list_for_each_entry(state, &sp->so_states, open_states) {
+               if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
+                       continue;
                if (state->state == 0)
                        continue;
                status = ops->recover_open(sp, state);
                if (status >= 0) {
-                       status = nfs4_reclaim_locks(ops, state);
-                       if (status < 0)
-                               goto out_err;
-                       list_for_each_entry(lock, &state->lock_states, ls_locks) {
-                               if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
-                                       printk("%s: Lock reclaim failed!\n",
-                                                       __FUNCTION__);
+                       status = nfs4_reclaim_locks(state, ops);
+                       if (status >= 0) {
+                               list_for_each_entry(lock, &state->lock_states, ls_locks) {
+                                       if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
+                                               printk("%s: Lock reclaim failed!\n",
+                                                       __func__);
+                               }
+                               continue;
                        }
-                       continue;
                }
                switch (status) {
                        default:
                                printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
-                                               __FUNCTION__, status);
+                                               __func__, status);
                        case -ENOENT:
-                       case -NFS4ERR_RECLAIM_BAD:
-                       case -NFS4ERR_RECLAIM_CONFLICT:
+                       case -ESTALE:
                                /*
                                 * Open state on this file cannot be recovered
                                 * All we can do is revert to using the zero stateid.
@@ -828,8 +923,13 @@ static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops *ops, struct n
                                /* Mark the file as being 'closed' */
                                state->state = 0;
                                break;
+                       case -NFS4ERR_RECLAIM_BAD:
+                       case -NFS4ERR_RECLAIM_CONFLICT:
+                               nfs4_state_mark_reclaim_nograce(sp->so_client, state);
+                               break;
                        case -NFS4ERR_EXPIRED:
                        case -NFS4ERR_NO_GRACE:
+                               nfs4_state_mark_reclaim_nograce(sp->so_client, state);
                        case -NFS4ERR_STALE_CLIENTID:
                                goto out_err;
                }
@@ -839,12 +939,26 @@ out_err:
        return status;
 }
 
-static void nfs4_state_mark_reclaim(struct nfs_client *clp)
+static void nfs4_clear_open_state(struct nfs4_state *state)
+{
+       struct nfs4_lock_state *lock;
+
+       clear_bit(NFS_DELEGATED_STATE, &state->flags);
+       clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+       clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+       clear_bit(NFS_O_RDWR_STATE, &state->flags);
+       list_for_each_entry(lock, &state->lock_states, ls_locks) {
+               lock->ls_seqid.counter = 0;
+               lock->ls_seqid.flags = 0;
+               lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
+       }
+}
+
+static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
 {
        struct nfs4_state_owner *sp;
        struct rb_node *pos;
        struct nfs4_state *state;
-       struct nfs4_lock_state *lock;
 
        /* Reset all sequence ids to zero */
        for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
@@ -853,98 +967,200 @@ static void nfs4_state_mark_reclaim(struct nfs_client *clp)
                sp->so_seqid.flags = 0;
                spin_lock(&sp->so_lock);
                list_for_each_entry(state, &sp->so_states, open_states) {
-                       clear_bit(NFS_DELEGATED_STATE, &state->flags);
-                       clear_bit(NFS_O_RDONLY_STATE, &state->flags);
-                       clear_bit(NFS_O_WRONLY_STATE, &state->flags);
-                       clear_bit(NFS_O_RDWR_STATE, &state->flags);
-                       list_for_each_entry(lock, &state->lock_states, ls_locks) {
-                               lock->ls_seqid.counter = 0;
-                               lock->ls_seqid.flags = 0;
-                               lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
-                       }
+                       if (mark_reclaim(clp, state))
+                               nfs4_clear_open_state(state);
                }
                spin_unlock(&sp->so_lock);
        }
 }
 
-static int reclaimer(void *ptr)
+static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
+{
+       /* Mark all delegations for reclaim */
+       nfs_delegation_mark_reclaim(clp);
+       nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
+}
+
+static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
 {
-       struct nfs_client *clp = ptr;
        struct nfs4_state_owner *sp;
        struct rb_node *pos;
-       struct nfs4_state_recovery_ops *ops;
-       struct rpc_cred *cred;
+       struct nfs4_state *state;
+
+       if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
+               return;
+
+       for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
+               sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
+               spin_lock(&sp->so_lock);
+               list_for_each_entry(state, &sp->so_states, open_states) {
+                       if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
+                               continue;
+                       nfs4_state_mark_reclaim_nograce(clp, state);
+               }
+               spin_unlock(&sp->so_lock);
+       }
+
+       nfs_delegation_reap_unclaimed(clp);
+}
+
+static void nfs_delegation_clear_all(struct nfs_client *clp)
+{
+       nfs_delegation_mark_reclaim(clp);
+       nfs_delegation_reap_unclaimed(clp);
+}
+
+static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
+{
+       nfs_delegation_clear_all(clp);
+       nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
+}
+
+static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp)
+{
+       clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
+}
+
+static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
+{
+       switch (error) {
+               case -NFS4ERR_CB_PATH_DOWN:
+                       set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state);
+                       break;
+               case -NFS4ERR_STALE_CLIENTID:
+               case -NFS4ERR_LEASE_MOVED:
+                       set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+                       nfs4_state_start_reclaim_reboot(clp);
+                       break;
+               case -NFS4ERR_EXPIRED:
+                       set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+                       nfs4_state_start_reclaim_nograce(clp);
+       }
+}
+
+static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
+{
+       struct rb_node *pos;
        int status = 0;
 
-       allow_signal(SIGKILL);
+       /* Note: list is protected by exclusive lock on cl->cl_sem */
+       for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
+               struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
+               status = nfs4_reclaim_open_state(sp, ops);
+               if (status < 0)
+                       break;
+       }
+       nfs4_recovery_handle_error(clp, status);
+       return status;
+}
 
-       /* Ensure exclusive access to NFSv4 state */
-       lock_kernel();
-       down_write(&clp->cl_sem);
-       /* Are there any NFS mounts out there? */
-       if (list_empty(&clp->cl_superblocks))
-               goto out;
-restart_loop:
-       ops = &nfs4_network_partition_recovery_ops;
-       /* Are there any open files on this volume? */
+static int nfs4_check_lease(struct nfs_client *clp)
+{
+       struct rpc_cred *cred;
+       int status = -NFS4ERR_EXPIRED;
+
+       /* Is the client already known to have an expired lease? */
+       if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
+               return 0;
        cred = nfs4_get_renew_cred(clp);
-       if (cred != NULL) {
-               /* Yes there are: try to renew the old lease */
-               status = nfs4_proc_renew(clp, cred);
-               switch (status) {
-                       case 0:
-                       case -NFS4ERR_CB_PATH_DOWN:
-                               put_rpccred(cred);
-                               goto out;
-                       case -NFS4ERR_STALE_CLIENTID:
-                       case -NFS4ERR_LEASE_MOVED:
-                               ops = &nfs4_reboot_recovery_ops;
-               }
-       } else {
-               /* "reboot" to ensure we clear all state on the server */
-               clp->cl_boot_time = CURRENT_TIME;
+       if (cred == NULL) {
                cred = nfs4_get_setclientid_cred(clp);
+               if (cred == NULL)
+                       goto out;
        }
-       /* We're going to have to re-establish a clientid */
-       nfs4_state_mark_reclaim(clp);
-       status = -ENOENT;
+       status = nfs4_proc_renew(clp, cred);
+       put_rpccred(cred);
+out:
+       nfs4_recovery_handle_error(clp, status);
+       return status;
+}
+
+static int nfs4_reclaim_lease(struct nfs_client *clp)
+{
+       struct rpc_cred *cred;
+       int status = -ENOENT;
+
+       cred = nfs4_get_setclientid_cred(clp);
        if (cred != NULL) {
                status = nfs4_init_client(clp, cred);
                put_rpccred(cred);
+               /* Handle case where the user hasn't set up machine creds */
+               if (status == -EACCES && cred == clp->cl_machine_cred) {
+                       nfs4_clear_machine_cred(clp);
+                       status = -EAGAIN;
+               }
        }
-       if (status)
-               goto out_error;
-       /* Mark all delegations for reclaim */
-       nfs_delegation_mark_reclaim(clp);
-       /* Note: list is protected by exclusive lock on cl->cl_sem */
-       for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
-               sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
-               status = nfs4_reclaim_open_state(ops, sp);
-               if (status < 0) {
-                       if (status == -NFS4ERR_NO_GRACE) {
-                               ops = &nfs4_network_partition_recovery_ops;
-                               status = nfs4_reclaim_open_state(ops, sp);
+       return status;
+}
+
+static int reclaimer(void *ptr)
+{
+       struct nfs_client *clp = ptr;
+       int status = 0;
+
+       allow_signal(SIGKILL);
+
+       /* Ensure exclusive access to NFSv4 state */
+       down_write(&clp->cl_sem);
+       while (!list_empty(&clp->cl_superblocks)) {
+               if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
+                       /* We're going to have to re-establish a clientid */
+                       status = nfs4_reclaim_lease(clp);
+                       if (status) {
+                               set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+                               if (status == -EAGAIN)
+                                       continue;
+                               goto out_error;
                        }
+                       clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
+               }
+
+               if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
+                       status = nfs4_check_lease(clp);
+                       if (status != 0)
+                               continue;
+               }
+
+               /* First recover reboot state... */
+               if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
+                       /* Note: list is protected by exclusive lock on cl->cl_sem */
+                       status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops);
                        if (status == -NFS4ERR_STALE_CLIENTID)
-                               goto restart_loop;
-                       if (status == -NFS4ERR_EXPIRED)
-                               goto restart_loop;
+                               continue;
+                       nfs4_state_end_reclaim_reboot(clp);
+                       continue;
                }
+
+               /* Now recover expired state... */
+               if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
+                       /* Note: list is protected by exclusive lock on cl->cl_sem */
+                       status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops);
+                       if (status < 0) {
+                               set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
+                               if (status == -NFS4ERR_STALE_CLIENTID)
+                                       continue;
+                               if (status == -NFS4ERR_EXPIRED)
+                                       continue;
+                               goto out_error;
+                       } else
+                               nfs4_state_end_reclaim_nograce(clp);
+                       continue;
+               }
+               break;
        }
-       nfs_delegation_reap_unclaimed(clp);
 out:
        up_write(&clp->cl_sem);
-       unlock_kernel();
-       if (status == -NFS4ERR_CB_PATH_DOWN)
+       if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state))
                nfs_handle_cb_pathdown(clp);
        nfs4_clear_recover_bit(clp);
        nfs_put_client(clp);
        module_put_and_exit(0);
        return 0;
 out_error:
-       printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
-                               NIPQUAD(clp->cl_addr.sin_addr), -status);
-       set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+       printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s"
+                       " with error %d\n", clp->cl_hostname, -status);
+       if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
+               nfs4_state_end_reclaim_reboot(clp);
        goto out;
 }