1 files changed, 154 insertions, 49 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 9f5f11ecfd93..198d51d17c13 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -64,6 +64,7 @@
 
 struct nfs4_opendata;
 static int _nfs4_proc_open(struct nfs4_opendata *data);
+static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
@@ -341,6 +342,27 @@ nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
                 free_slotid, tbl->highest_used_slotid);
 }
 
+/*
+ * Signal state manager thread if session is drained
+ */
+static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
+{
+        struct rpc_task *task;
+
+        if (!test_bit(NFS4CLNT_SESSION_DRAINING, &ses->clp->cl_state)) {
+                task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
+                if (task)
+                        rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+                return;
+        }
+
+        if (ses->fc_slot_table.highest_used_slotid != -1)
+                return;
+
+        dprintk("%s COMPLETE: Session Drained\n", __func__);
+        complete(&ses->complete);
+}
+
 static void nfs41_sequence_free_slot(const struct nfs_client *clp,
                               struct nfs4_sequence_res *res)
 {
@@ -356,15 +378,7 @@ static void nfs41_sequence_free_slot(const struct nfs_client *clp,
 
         spin_lock(&tbl->slot_tbl_lock);
         nfs4_free_slot(tbl, res->sr_slotid);
-
-        /* Signal state manager thread if session is drained */
-        if (test_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
-                if (tbl->highest_used_slotid == -1) {
-                        dprintk("%s COMPLETE: Session Drained\n", __func__);
-                        complete(&clp->cl_session->complete);
-                }
-        } else
-                rpc_wake_up_next(&tbl->slot_tbl_waitq);
+        nfs41_check_drain_session_complete(clp->cl_session);
         spin_unlock(&tbl->slot_tbl_lock);
         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 }
@@ -421,7 +435,7 @@ out:
  * Note: must be called with under the slot_tbl_lock.
  */
 static u8
-nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
+nfs4_find_slot(struct nfs4_slot_table *tbl)
 {
         int slotid;
         u8 ret_id = NFS4_MAX_SLOT_TABLE;
@@ -463,7 +477,8 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
         tbl = &session->fc_slot_table;
 
         spin_lock(&tbl->slot_tbl_lock);
-        if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state)) {
+        if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state) &&
+            !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
                 /*
                  * The state manager will wait until the slot table is empty.
                  * Schedule the reset thread
@@ -474,7 +489,15 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
                 return -EAGAIN;
         }
 
-        slotid = nfs4_find_slot(tbl, task);
+        if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
+            !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
+                rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+                spin_unlock(&tbl->slot_tbl_lock);
+                dprintk("%s enforce FIFO order\n", __func__);
+                return -EAGAIN;
+        }
+
+        slotid = nfs4_find_slot(tbl);
         if (slotid == NFS4_MAX_SLOT_TABLE) {
                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
                 spin_unlock(&tbl->slot_tbl_lock);
@@ -483,6 +506,7 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
         }
         spin_unlock(&tbl->slot_tbl_lock);
 
+        rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
         slot = tbl->slots + slotid;
         args->sa_session = session;
         args->sa_slotid = slotid;
@@ -545,6 +569,12 @@ static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
         rpc_call_start(task);
 }
 
+static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
+{
+        rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+        nfs41_call_sync_prepare(task, calldata);
+}
+
 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 {
         struct nfs41_call_sync_data *data = calldata;
@@ -557,12 +587,18 @@ struct rpc_call_ops nfs41_call_sync_ops = {
         .rpc_call_done = nfs41_call_sync_done,
 };
 
+struct rpc_call_ops nfs41_call_priv_sync_ops = {
+        .rpc_call_prepare = nfs41_call_priv_sync_prepare,
+        .rpc_call_done = nfs41_call_sync_done,
+};
+
 static int nfs4_call_sync_sequence(struct nfs_client *clp,
                                    struct rpc_clnt *clnt,
                                    struct rpc_message *msg,
                                    struct nfs4_sequence_args *args,
                                    struct nfs4_sequence_res *res,
-                                   int cache_reply)
+                                   int cache_reply,
+                                   int privileged)
 {
         int ret;
         struct rpc_task *task;
@@ -580,6 +616,8 @@ static int nfs4_call_sync_sequence(struct nfs_client *clp,
         };
 
         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
+        if (privileged)
+                task_setup.callback_ops = &nfs41_call_priv_sync_ops;
         task = rpc_run_task(&task_setup);
         if (IS_ERR(task))
                 ret = PTR_ERR(task);
@@ -597,7 +635,7 @@ int _nfs4_call_sync_session(struct nfs_server *server,
                             int cache_reply)
 {
         return nfs4_call_sync_sequence(server->nfs_client, server->client,
-                                       msg, args, res, cache_reply);
+                                       msg, args, res, cache_reply, 0);
 }
 
 #endif /* CONFIG_NFS_V4_1 */
@@ -1035,7 +1073,7 @@ static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmod
         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
         nfs4_init_opendata_res(opendata);
-        ret = _nfs4_proc_open(opendata);
+        ret = _nfs4_recover_proc_open(opendata);
         if (ret != 0)
                 return ret; 
         newstate = nfs4_opendata_to_nfs4_state(opendata);
@@ -1326,6 +1364,12 @@ out_no_action:
 
 }
 
+static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
+{
+        rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+        nfs4_open_prepare(task, calldata);
+}
+
 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 {
         struct nfs4_opendata *data = calldata;
@@ -1384,10 +1428,13 @@ static const struct rpc_call_ops nfs4_open_ops = {
         .rpc_release = nfs4_open_release,
 };
 
-/*
- * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
- */
-static int _nfs4_proc_open(struct nfs4_opendata *data)
+static const struct rpc_call_ops nfs4_recover_open_ops = {
+        .rpc_call_prepare = nfs4_recover_open_prepare,
+        .rpc_call_done = nfs4_open_done,
+        .rpc_release = nfs4_open_release,
+};
+
+static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
 {
         struct inode *dir = data->dir->d_inode;
         struct nfs_server *server = NFS_SERVER(dir);
@@ -1414,21 +1461,57 @@ static int _nfs4_proc_open(struct nfs4_opendata *data)
         data->rpc_done = 0;
         data->rpc_status = 0;
         data->cancelled = 0;
+        if (isrecover)
+                task_setup_data.callback_ops = &nfs4_recover_open_ops;
         task = rpc_run_task(&task_setup_data);
-        if (IS_ERR(task))
-                return PTR_ERR(task);
-        status = nfs4_wait_for_completion_rpc_task(task);
-        if (status != 0) {
-                data->cancelled = 1;
-                smp_wmb();
-        } else
-                status = data->rpc_status;
-        rpc_put_task(task);
+        if (IS_ERR(task))
+                return PTR_ERR(task);
+        status = nfs4_wait_for_completion_rpc_task(task);
+        if (status != 0) {
+                data->cancelled = 1;
+                smp_wmb();
+        } else
+                status = data->rpc_status;
+        rpc_put_task(task);
+
+        return status;
+}
+
+static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
+{
+        struct inode *dir = data->dir->d_inode;
+        struct nfs_openres *o_res = &data->o_res;
+        int status;
+
+        status = nfs4_run_open_task(data, 1);
         if (status != 0 || !data->rpc_done)
                 return status;
 
-        if (o_res->fh.size == 0)
-                _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
+        nfs_refresh_inode(dir, o_res->dir_attr);
+
+        if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
+                status = _nfs4_proc_open_confirm(data);
+                if (status != 0)
+                        return status;
+        }
+
+        return status;
+}
+
+/*
+ * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
+ */
+static int _nfs4_proc_open(struct nfs4_opendata *data)
+{
+        struct inode *dir = data->dir->d_inode;
+        struct nfs_server *server = NFS_SERVER(dir);
+        struct nfs_openargs *o_arg = &data->o_arg;
+        struct nfs_openres *o_res = &data->o_res;
+        int status;
+
+        status = nfs4_run_open_task(data, 0);
+        if (status != 0 || !data->rpc_done)
+                return status;
 
         if (o_arg->open_flags & O_CREAT) {
                 update_changeattr(dir, &o_res->cinfo);
@@ -1752,11 +1835,10 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
                         if (calldata->arg.fmode == 0)
                                 break;
                 default:
-                        if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
-                                nfs_restart_rpc(task, server->nfs_client);
-                                return;
-                        }
+                        if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
+                                rpc_restart_call_prepare(task);
         }
+        nfs_release_seqid(calldata->arg.seqid);
         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
 }
 
@@ -1848,8 +1930,6 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
         calldata->state = state;
         calldata->arg.fh = NFS_FH(state->inode);
         calldata->arg.stateid = &state->open_stateid;
-        if (nfs4_has_session(server->nfs_client))
-                memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
         /* Serialization for the sequence id */
         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
         if (calldata->arg.seqid == NULL)
@@ -3941,6 +4021,12 @@ static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
 }
 
+static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
+{
+        rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+        nfs4_lock_prepare(task, calldata);
+}
+
 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
 {
         struct nfs4_lockdata *data = calldata;
@@ -3996,7 +4082,13 @@ static const struct rpc_call_ops nfs4_lock_ops = {
         .rpc_release = nfs4_lock_release,
 };
 
-static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
+static const struct rpc_call_ops nfs4_recover_lock_ops = {
+        .rpc_call_prepare = nfs4_recover_lock_prepare,
+        .rpc_call_done = nfs4_lock_done,
+        .rpc_release = nfs4_lock_release,
+};
+
+static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
 {
         struct nfs4_lockdata *data;
         struct rpc_task *task;
@@ -4020,8 +4112,11 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *f
                 return -ENOMEM;
         if (IS_SETLKW(cmd))
                 data->arg.block = 1;
-        if (reclaim != 0)
-                data->arg.reclaim = 1;
+        if (recovery_type > NFS_LOCK_NEW) {
+                if (recovery_type == NFS_LOCK_RECLAIM)
+                        data->arg.reclaim = NFS_LOCK_RECLAIM;
+                task_setup_data.callback_ops = &nfs4_recover_lock_ops;
+        }
         msg.rpc_argp = &data->arg,
         msg.rpc_resp = &data->res,
         task_setup_data.callback_data = data;
@@ -4048,7 +4143,7 @@ static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request
                 /* Cache the lock if possible... */
                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
                         return 0;
-                err = _nfs4_do_setlk(state, F_SETLK, request, 1);
+                err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
                 if (err != -NFS4ERR_DELAY)
                         break;
                 nfs4_handle_exception(server, err, &exception);
@@ -4068,7 +4163,7 @@ static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request
         do {
                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
                         return 0;
-                err = _nfs4_do_setlk(state, F_SETLK, request, 0);
+                err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
                 switch (err) {
                 default:
                         goto out;
@@ -4104,7 +4199,7 @@ static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock
                 status = do_vfs_lock(request->fl_file, request);
                 goto out_unlock;
         }
-        status = _nfs4_do_setlk(state, cmd, request, 0);
+        status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
         if (status != 0)
                 goto out_unlock;
         /* Note: we always want to sleep here! */
@@ -4187,7 +4282,7 @@ int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
         if (err != 0)
                 goto out;
         do {
-                err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
+                err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
                 switch (err) {
                         default:
                                 printk(KERN_ERR "%s: unhandled error %d.\n",
@@ -4395,11 +4490,12 @@ static void nfs4_get_lease_time_prepare(struct rpc_task *task,
                         (struct nfs4_get_lease_time_data *)calldata;
 
         dprintk("--> %s\n", __func__);
+        rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
         /* just setup sequence, do not trigger session recovery
            since we're invoked within one */
         ret = nfs41_setup_sequence(data->clp->cl_session,
-                                        &data->args->la_seq_args,
-                                        &data->res->lr_seq_res, 0, task);
+                                   &data->args->la_seq_args,
+                                   &data->res->lr_seq_res, 0, task);
 
         BUG_ON(ret == -EAGAIN);
         rpc_call_start(task);
@@ -4619,7 +4715,7 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
         tbl = &session->fc_slot_table;
         tbl->highest_used_slotid = -1;
         spin_lock_init(&tbl->slot_tbl_lock);
-        rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
+        rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
 
         tbl = &session->bc_slot_table;
         tbl->highest_used_slotid = -1;
@@ -4838,14 +4934,22 @@ int nfs4_init_session(struct nfs_server *server)
 {
         struct nfs_client *clp = server->nfs_client;
         struct nfs4_session *session;
+        unsigned int rsize, wsize;
         int ret;
 
         if (!nfs4_has_session(clp))
                 return 0;
 
+        rsize = server->rsize;
+        if (rsize == 0)
+                rsize = NFS_MAX_FILE_IO_SIZE;
+        wsize = server->wsize;
+        if (wsize == 0)
+                wsize = NFS_MAX_FILE_IO_SIZE;
+
         session = clp->cl_session;
-        session->fc_attrs.max_rqst_sz = server->wsize + nfs41_maxwrite_overhead;
-        session->fc_attrs.max_resp_sz = server->rsize + nfs41_maxread_overhead;
+        session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
+        session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
 
         ret = nfs4_recover_expired_lease(server);
         if (!ret)
@@ -4871,7 +4975,7 @@ static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
         args.sa_cache_this = 0;
 
         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
-                                       &res, 0);
+                                       &res, args.sa_cache_this, 1);
 }
 
 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
@@ -4953,6 +5057,7 @@ static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
 {
         struct nfs4_reclaim_complete_data *calldata = data;
 
+        rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
         if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
                                 &calldata->res.seq_res, 0, task))
                 return;