#if defined(CONFIG_NFS_V4_1)
+/*
+ * nfs4_free_slot - free a slot and efficiently update slot table.
+ *
+ * freeing a slot is trivially done by clearing its respective bit
+ * in the bitmap.
+ * If the freed slotid equals highest_used_slotid we want to update it
+ * so that the server would be able to size down the slot table if needed,
+ * otherwise we know that the highest_used_slotid is still in use.
+ * When updating highest_used_slotid there may be "holes" in the bitmap
+ * so we need to scan down from highest_used_slotid to 0 looking for the now
+ * highest slotid in use.
+ * If none found, highest_used_slotid is set to -1.
+ */
+static void
+nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
+{
+ int slotid = free_slotid;
+
+ spin_lock(&tbl->slot_tbl_lock);
+ /* clear used bit in bitmap */
+ __clear_bit(slotid, tbl->used_slots);
+
+ /* update highest_used_slotid when it is freed */
+ if (slotid == tbl->highest_used_slotid) {
+ slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
+ if (slotid >= 0 && slotid < tbl->max_slots)
+ tbl->highest_used_slotid = slotid;
+ else
+ tbl->highest_used_slotid = -1;
+ }
+ rpc_wake_up_next(&tbl->slot_tbl_waitq);
+ spin_unlock(&tbl->slot_tbl_lock);
+ dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
+ free_slotid, tbl->highest_used_slotid);
+}
+
+void nfs41_sequence_free_slot(const struct nfs_client *clp,
+ struct nfs4_sequence_res *res)
+{
+ struct nfs4_slot_table *tbl;
+
+ if (!nfs4_has_session(clp)) {
+ dprintk("%s: No session\n", __func__);
+ return;
+ }
+ tbl = &clp->cl_session->fc_slot_table;
+ if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
+ dprintk("%s: No slot\n", __func__);
+ /* just wake up the next guy waiting since
+ * we may have not consumed a slot after all */
+ rpc_wake_up_next(&tbl->slot_tbl_waitq);
+ return;
+ }
+ nfs4_free_slot(tbl, res->sr_slotid);
+ res->sr_slotid = NFS4_MAX_SLOT_TABLE;
+}
+
+static void nfs41_sequence_done(struct nfs_client *clp,
+ struct nfs4_sequence_res *res,
+ int rpc_status)
+{
+ unsigned long timestamp;
+ struct nfs4_slot_table *tbl;
+ struct nfs4_slot *slot;
+
+ /*
+ * sr_status remains 1 if an RPC level error occurred. The server
+ * may or may not have processed the sequence operation..
+ * Proceed as if the server received and processed the sequence
+ * operation.
+ */
+ if (res->sr_status == 1)
+ res->sr_status = NFS_OK;
+
+ /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
+ if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
+ goto out;
+
+ tbl = &clp->cl_session->fc_slot_table;
+ slot = tbl->slots + res->sr_slotid;
+
+ if (res->sr_status == 0) {
+ /* Update the slot's sequence and clientid lease timer */
+ ++slot->seq_nr;
+ timestamp = res->sr_renewal_time;
+ spin_lock(&clp->cl_lock);
+ if (time_before(clp->cl_last_renewal, timestamp))
+ clp->cl_last_renewal = timestamp;
+ spin_unlock(&clp->cl_lock);
+ return;
+ }
+out:
+ /* The session may be reset by one of the error handlers. */
+ dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
+ nfs41_sequence_free_slot(clp, res);
+}
+
+/*
+ * nfs4_find_slot - efficiently look for a free slot
+ *
+ * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
+ * If found, we mark the slot as used, update the highest_used_slotid,
+ * and respectively set up the sequence operation args.
+ * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
+ *
+ * Note: must be called with under the slot_tbl_lock.
+ */
+static u8
+nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
+{
+ int slotid;
+ u8 ret_id = NFS4_MAX_SLOT_TABLE;
+ BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
+
+ dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
+ __func__, tbl->used_slots[0], tbl->highest_used_slotid,
+ tbl->max_slots);
+ slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
+ if (slotid >= tbl->max_slots)
+ goto out;
+ __set_bit(slotid, tbl->used_slots);
+ if (slotid > tbl->highest_used_slotid)
+ tbl->highest_used_slotid = slotid;
+ ret_id = slotid;
+out:
+ dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
+ __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
+ return ret_id;
+}
+
+static int nfs41_setup_sequence(struct nfs4_session *session,
+ struct nfs4_sequence_args *args,
+ struct nfs4_sequence_res *res,
+ int cache_reply,
+ struct rpc_task *task)
+{
+ struct nfs4_slot *slot;
+ struct nfs4_slot_table *tbl;
+ u8 slotid;
+
+ dprintk("--> %s\n", __func__);
+ /* slot already allocated? */
+ if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
+ return 0;
+
+ memset(res, 0, sizeof(*res));
+ res->sr_slotid = NFS4_MAX_SLOT_TABLE;
+ tbl = &session->fc_slot_table;
+
+ spin_lock(&tbl->slot_tbl_lock);
+ slotid = nfs4_find_slot(tbl, task);
+ if (slotid == NFS4_MAX_SLOT_TABLE) {
+ rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+ spin_unlock(&tbl->slot_tbl_lock);
+ dprintk("<-- %s: no free slots\n", __func__);
+ return -EAGAIN;
+ }
+ spin_unlock(&tbl->slot_tbl_lock);
+
+ slot = tbl->slots + slotid;
+ args->sa_slotid = slotid;
+ args->sa_cache_this = cache_reply;
+
+ dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
+
+ res->sr_slotid = slotid;
+ res->sr_renewal_time = jiffies;
+ /*
+ * sr_status is only set in decode_sequence, and so will remain
+ * set to 1 if an rpc level failure occurs.
+ */
+ res->sr_status = 1;
+ return 0;
+}
+
+int nfs4_setup_sequence(struct nfs_client *clp,
+ struct nfs4_sequence_args *args,
+ struct nfs4_sequence_res *res,
+ int cache_reply,
+ struct rpc_task *task)
+{
+ int ret = 0;
+
+ dprintk("--> %s clp %p session %p sr_slotid %d\n",
+ __func__, clp, clp->cl_session, res->sr_slotid);
+
+ if (!nfs4_has_session(clp))
+ goto out;
+ ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
+ task);
+ if (ret != -EAGAIN) {
+ /* terminate rpc task */
+ task->tk_status = ret;
+ task->tk_action = NULL;
+ }
+out:
+ dprintk("<-- %s status=%d\n", __func__, ret);
+ return ret;
+}
+
+struct nfs41_call_sync_data {
+ struct nfs_client *clp;
+ struct nfs4_sequence_args *seq_args;
+ struct nfs4_sequence_res *seq_res;
+ int cache_reply;
+};
+
+static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs41_call_sync_data *data = calldata;
+
+ dprintk("--> %s data->clp->cl_session %p\n", __func__,
+ data->clp->cl_session);
+ if (nfs4_setup_sequence(data->clp, data->seq_args,
+ data->seq_res, data->cache_reply, task))
+ return;
+ rpc_call_start(task);
+}
+
+static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs41_call_sync_data *data = calldata;
+
+ nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
+ nfs41_sequence_free_slot(data->clp, data->seq_res);
+}
+
+struct rpc_call_ops nfs41_call_sync_ops = {
+ .rpc_call_prepare = nfs41_call_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 ret;
+ struct rpc_task *task;
+ struct nfs41_call_sync_data data = {
+ .clp = clp,
+ .seq_args = args,
+ .seq_res = res,
+ .cache_reply = cache_reply,
+ };
+ struct rpc_task_setup task_setup = {
+ .rpc_client = clnt,
+ .rpc_message = msg,
+ .callback_ops = &nfs41_call_sync_ops,
+ .callback_data = &data
+ };
+
+ res->sr_slotid = NFS4_MAX_SLOT_TABLE;
+ task = rpc_run_task(&task_setup);
+ if (IS_ERR(task))
+ ret = PTR_ERR(task);
+ else {
+ ret = task->tk_status;
+ rpc_put_task(task);
+ }
+ return ret;
+}
+
int _nfs4_call_sync_session(struct nfs_server *server,
struct rpc_message *msg,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
int cache_reply)
{
- /* in preparation for setting up the sequence op */
- return rpc_call_sync(server->client, msg, 0);
+ return nfs4_call_sync_sequence(server->nfs_client, server->client,
+ msg, args, res, cache_reply);
}
#endif /* CONFIG_NFS_V4_1 */
(server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
&(res)->seq_res, (cache_reply))
+static void nfs4_sequence_done(const struct nfs_server *server,
+ struct nfs4_sequence_res *res, int rpc_status)
+{
+#ifdef CONFIG_NFS_V4_1
+ if (nfs4_has_session(server->nfs_client))
+ nfs41_sequence_done(server->nfs_client, res, rpc_status);
+#endif /* CONFIG_NFS_V4_1 */
+}
+
+/* no restart, therefore free slot here */
+static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
+ struct nfs4_sequence_res *res,
+ int rpc_status)
+{
+ nfs4_sequence_done(server, res, rpc_status);
+ nfs4_sequence_free_slot(server->nfs_client, res);
+}
+
static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
{
struct nfs_inode *nfsi = NFS_I(dir);
p->o_arg.server = server;
p->o_arg.bitmask = server->attr_bitmask;
p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
+ p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
if (flags & O_EXCL) {
u32 *s = (u32 *) p->o_arg.u.verifier.data;
s[0] = jiffies;
struct nfs4_state *state = calldata->state;
struct nfs_server *server = NFS_SERVER(calldata->inode);
+ nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
if (RPC_ASSASSINATED(task))
return;
/* hmm. we are done with the inode, and in the process of freeing
return;
}
}
+ nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
nfs_refresh_inode(calldata->inode, calldata->res.fattr);
}
calldata->arg.fmode = FMODE_WRITE;
}
calldata->timestamp = jiffies;
+ if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
+ &calldata->arg.seq_args, &calldata->res.seq_res,
+ 1, task))
+ return;
rpc_call_start(task);
}
};
int status = -ENOMEM;
- calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
+ calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
if (calldata == NULL)
goto out;
calldata->inode = state->inode;
calldata->res.fattr = &calldata->fattr;
calldata->res.seqid = calldata->arg.seqid;
calldata->res.server = server;
+ calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
calldata->path.mnt = mntget(path->mnt);
calldata->path.dentry = dget(path->dentry);
memcpy(&data->stateid, stateid, sizeof(data->stateid));
data->res.fattr = &data->fattr;
data->res.server = server;
+ data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
nfs_fattr_init(data->res.fattr);
data->timestamp = jiffies;
data->rpc_status = 0;
p->arg.fl = &p->fl;
p->arg.seqid = seqid;
p->res.seqid = seqid;
+ p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
p->arg.stateid = &lsp->ls_stateid;
p->lsp = lsp;
atomic_inc(&lsp->ls_count);
p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
p->arg.lock_owner.id = lsp->ls_id.id;
p->res.lock_seqid = p->arg.lock_seqid;
+ p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
p->lsp = lsp;
atomic_inc(&lsp->ls_count);
p->ctx = get_nfs_open_context(ctx);
projects / linux-2.6-block.git / blobdiff