mirror of https://gitee.com/openkylin/linux.git
1338 lines
34 KiB
C
1338 lines
34 KiB
C
/*
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* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/xprt.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include "internal.h"
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#include "callback.h"
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#include "delegation.h"
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#include "nfs4session.h"
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#include "nfs4idmap.h"
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#include "pnfs.h"
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#include "netns.h"
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#define NFSDBG_FACILITY NFSDBG_CLIENT
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/*
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* Get a unique NFSv4.0 callback identifier which will be used
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* by the V4.0 callback service to lookup the nfs_client struct
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*/
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static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
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{
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int ret = 0;
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struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
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if (clp->rpc_ops->version != 4 || minorversion != 0)
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return ret;
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idr_preload(GFP_KERNEL);
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spin_lock(&nn->nfs_client_lock);
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ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
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if (ret >= 0)
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clp->cl_cb_ident = ret;
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spin_unlock(&nn->nfs_client_lock);
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idr_preload_end();
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return ret < 0 ? ret : 0;
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}
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#ifdef CONFIG_NFS_V4_1
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/**
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* Per auth flavor data server rpc clients
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*/
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struct nfs4_ds_server {
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struct list_head list; /* ds_clp->cl_ds_clients */
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struct rpc_clnt *rpc_clnt;
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};
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/**
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* Common lookup case for DS I/O
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*/
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static struct nfs4_ds_server *
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nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
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{
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struct nfs4_ds_server *dss;
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rcu_read_lock();
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list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
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if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
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continue;
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goto out;
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}
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dss = NULL;
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out:
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rcu_read_unlock();
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return dss;
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}
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static struct nfs4_ds_server *
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nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
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struct nfs4_ds_server *new)
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{
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struct nfs4_ds_server *dss;
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spin_lock(&ds_clp->cl_lock);
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list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
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if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
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continue;
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goto out;
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}
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if (new)
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list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
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dss = new;
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out:
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spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
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return dss;
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}
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static struct nfs4_ds_server *
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nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
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{
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struct nfs4_ds_server *dss;
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dss = kmalloc(sizeof(*dss), GFP_NOFS);
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if (dss == NULL)
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return ERR_PTR(-ENOMEM);
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dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
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if (IS_ERR(dss->rpc_clnt)) {
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int err = PTR_ERR(dss->rpc_clnt);
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kfree (dss);
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return ERR_PTR(err);
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}
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INIT_LIST_HEAD(&dss->list);
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return dss;
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}
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static void
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nfs4_free_ds_server(struct nfs4_ds_server *dss)
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{
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rpc_release_client(dss->rpc_clnt);
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kfree(dss);
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}
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/**
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* Find or create a DS rpc client with th MDS server rpc client auth flavor
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* in the nfs_client cl_ds_clients list.
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*/
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struct rpc_clnt *
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nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
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{
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struct nfs4_ds_server *dss, *new;
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rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
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dss = nfs4_find_ds_client(ds_clp, flavor);
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if (dss != NULL)
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goto out;
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new = nfs4_alloc_ds_server(ds_clp, flavor);
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if (IS_ERR(new))
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return ERR_CAST(new);
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dss = nfs4_add_ds_client(ds_clp, flavor, new);
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if (dss != new)
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nfs4_free_ds_server(new);
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out:
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return dss->rpc_clnt;
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}
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EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
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static void
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nfs4_shutdown_ds_clients(struct nfs_client *clp)
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{
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struct nfs4_ds_server *dss;
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LIST_HEAD(shutdown_list);
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while (!list_empty(&clp->cl_ds_clients)) {
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dss = list_entry(clp->cl_ds_clients.next,
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struct nfs4_ds_server, list);
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list_del(&dss->list);
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rpc_shutdown_client(dss->rpc_clnt);
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kfree (dss);
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}
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}
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void nfs41_shutdown_client(struct nfs_client *clp)
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{
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if (nfs4_has_session(clp)) {
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nfs4_shutdown_ds_clients(clp);
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nfs4_destroy_session(clp->cl_session);
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nfs4_destroy_clientid(clp);
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}
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}
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#endif /* CONFIG_NFS_V4_1 */
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void nfs40_shutdown_client(struct nfs_client *clp)
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{
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if (clp->cl_slot_tbl) {
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nfs4_shutdown_slot_table(clp->cl_slot_tbl);
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kfree(clp->cl_slot_tbl);
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}
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}
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struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
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{
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int err;
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struct nfs_client *clp = nfs_alloc_client(cl_init);
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if (IS_ERR(clp))
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return clp;
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err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
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if (err)
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goto error;
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if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
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err = -EINVAL;
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goto error;
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}
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spin_lock_init(&clp->cl_lock);
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INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
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INIT_LIST_HEAD(&clp->cl_ds_clients);
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rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
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clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
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clp->cl_minorversion = cl_init->minorversion;
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clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
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clp->cl_mig_gen = 1;
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#if IS_ENABLED(CONFIG_NFS_V4_1)
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init_waitqueue_head(&clp->cl_lock_waitq);
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#endif
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return clp;
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error:
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nfs_free_client(clp);
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return ERR_PTR(err);
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}
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/*
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* Destroy the NFS4 callback service
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*/
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static void nfs4_destroy_callback(struct nfs_client *clp)
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{
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if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
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nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
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}
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static void nfs4_shutdown_client(struct nfs_client *clp)
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{
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if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
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nfs4_kill_renewd(clp);
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clp->cl_mvops->shutdown_client(clp);
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nfs4_destroy_callback(clp);
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if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
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nfs_idmap_delete(clp);
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rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
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kfree(clp->cl_serverowner);
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kfree(clp->cl_serverscope);
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kfree(clp->cl_implid);
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kfree(clp->cl_owner_id);
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}
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void nfs4_free_client(struct nfs_client *clp)
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{
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nfs4_shutdown_client(clp);
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nfs_free_client(clp);
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}
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/*
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* Initialize the NFS4 callback service
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*/
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static int nfs4_init_callback(struct nfs_client *clp)
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{
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struct rpc_xprt *xprt;
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int error;
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xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
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if (nfs4_has_session(clp)) {
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error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
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if (error < 0)
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return error;
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}
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error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
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if (error < 0) {
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dprintk("%s: failed to start callback. Error = %d\n",
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__func__, error);
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return error;
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}
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__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
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return 0;
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}
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/**
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* nfs40_init_client - nfs_client initialization tasks for NFSv4.0
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* @clp - nfs_client to initialize
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*
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* Returns zero on success, or a negative errno if some error occurred.
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*/
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int nfs40_init_client(struct nfs_client *clp)
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{
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struct nfs4_slot_table *tbl;
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int ret;
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tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
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if (tbl == NULL)
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return -ENOMEM;
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ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
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"NFSv4.0 transport Slot table");
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if (ret) {
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kfree(tbl);
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return ret;
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}
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clp->cl_slot_tbl = tbl;
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return 0;
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}
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#if defined(CONFIG_NFS_V4_1)
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/**
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* nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
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* @clp - nfs_client to initialize
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*
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* Returns zero on success, or a negative errno if some error occurred.
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*/
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int nfs41_init_client(struct nfs_client *clp)
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{
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struct nfs4_session *session = NULL;
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/*
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* Create the session and mark it expired.
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* When a SEQUENCE operation encounters the expired session
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* it will do session recovery to initialize it.
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*/
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session = nfs4_alloc_session(clp);
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if (!session)
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return -ENOMEM;
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clp->cl_session = session;
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/*
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* The create session reply races with the server back
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* channel probe. Mark the client NFS_CS_SESSION_INITING
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* so that the client back channel can find the
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* nfs_client struct
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*/
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nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
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return 0;
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}
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#endif /* CONFIG_NFS_V4_1 */
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/*
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* Initialize the minor version specific parts of an NFS4 client record
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*/
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static int nfs4_init_client_minor_version(struct nfs_client *clp)
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{
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int ret;
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ret = clp->cl_mvops->init_client(clp);
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if (ret)
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return ret;
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return nfs4_init_callback(clp);
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}
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/**
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* nfs4_init_client - Initialise an NFS4 client record
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*
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* @clp: nfs_client to initialise
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* @timeparms: timeout parameters for underlying RPC transport
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* @ip_addr: callback IP address in presentation format
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* @authflavor: authentication flavor for underlying RPC transport
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*
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* Returns pointer to an NFS client, or an ERR_PTR value.
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*/
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struct nfs_client *nfs4_init_client(struct nfs_client *clp,
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const struct nfs_client_initdata *cl_init)
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{
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char buf[INET6_ADDRSTRLEN + 1];
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const char *ip_addr = cl_init->ip_addr;
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struct nfs_client *old;
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int error;
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if (clp->cl_cons_state == NFS_CS_READY) {
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/* the client is initialised already */
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dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
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return clp;
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}
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/* Check NFS protocol revision and initialize RPC op vector */
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clp->rpc_ops = &nfs_v4_clientops;
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if (clp->cl_minorversion != 0)
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__set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
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__set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
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__set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
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error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
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if (error == -EINVAL)
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error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
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if (error < 0)
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goto error;
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/* If no clientaddr= option was specified, find a usable cb address */
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if (ip_addr == NULL) {
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struct sockaddr_storage cb_addr;
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struct sockaddr *sap = (struct sockaddr *)&cb_addr;
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error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
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if (error < 0)
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goto error;
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error = rpc_ntop(sap, buf, sizeof(buf));
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if (error < 0)
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goto error;
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ip_addr = (const char *)buf;
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}
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strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
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error = nfs_idmap_new(clp);
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if (error < 0) {
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dprintk("%s: failed to create idmapper. Error = %d\n",
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__func__, error);
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goto error;
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}
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__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
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error = nfs4_init_client_minor_version(clp);
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if (error < 0)
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goto error;
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if (!nfs4_has_session(clp))
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nfs_mark_client_ready(clp, NFS_CS_READY);
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error = nfs4_discover_server_trunking(clp, &old);
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if (error < 0)
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goto error;
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if (clp != old)
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clp->cl_preserve_clid = true;
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nfs_put_client(clp);
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return old;
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error:
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nfs_mark_client_ready(clp, error);
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nfs_put_client(clp);
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dprintk("<-- nfs4_init_client() = xerror %d\n", error);
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return ERR_PTR(error);
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}
|
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|
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/*
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* SETCLIENTID just did a callback update with the callback ident in
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* "drop," but server trunking discovery claims "drop" and "keep" are
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* actually the same server. Swap the callback IDs so that "keep"
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* will continue to use the callback ident the server now knows about,
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* and so that "keep"'s original callback ident is destroyed when
|
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* "drop" is freed.
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*/
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static void nfs4_swap_callback_idents(struct nfs_client *keep,
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struct nfs_client *drop)
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{
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struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
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unsigned int save = keep->cl_cb_ident;
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|
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if (keep->cl_cb_ident == drop->cl_cb_ident)
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return;
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|
|
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dprintk("%s: keeping callback ident %u and dropping ident %u\n",
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__func__, keep->cl_cb_ident, drop->cl_cb_ident);
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spin_lock(&nn->nfs_client_lock);
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idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
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keep->cl_cb_ident = drop->cl_cb_ident;
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idr_replace(&nn->cb_ident_idr, drop, save);
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drop->cl_cb_ident = save;
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|
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spin_unlock(&nn->nfs_client_lock);
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}
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|
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static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
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const struct nfs_client *clp2)
|
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{
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if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
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return true;
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return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
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}
|
|
|
|
/**
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* nfs40_walk_client_list - Find server that recognizes a client ID
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|
*
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* @new: nfs_client with client ID to test
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* @result: OUT: found nfs_client, or new
|
|
* @cred: credential to use for trunking test
|
|
*
|
|
* Returns zero, a negative errno, or a negative NFS4ERR status.
|
|
* If zero is returned, an nfs_client pointer is planted in "result."
|
|
*
|
|
* NB: nfs40_walk_client_list() relies on the new nfs_client being
|
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* the last nfs_client on the list.
|
|
*/
|
|
int nfs40_walk_client_list(struct nfs_client *new,
|
|
struct nfs_client **result,
|
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struct rpc_cred *cred)
|
|
{
|
|
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
|
|
struct nfs_client *pos, *prev = NULL;
|
|
struct nfs4_setclientid_res clid = {
|
|
.clientid = new->cl_clientid,
|
|
.confirm = new->cl_confirm,
|
|
};
|
|
int status = -NFS4ERR_STALE_CLIENTID;
|
|
|
|
spin_lock(&nn->nfs_client_lock);
|
|
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
|
|
|
|
if (pos->rpc_ops != new->rpc_ops)
|
|
continue;
|
|
|
|
if (pos->cl_minorversion != new->cl_minorversion)
|
|
continue;
|
|
|
|
/* If "pos" isn't marked ready, we can't trust the
|
|
* remaining fields in "pos" */
|
|
if (pos->cl_cons_state > NFS_CS_READY) {
|
|
atomic_inc(&pos->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
|
|
nfs_put_client(prev);
|
|
prev = pos;
|
|
|
|
status = nfs_wait_client_init_complete(pos);
|
|
if (status < 0)
|
|
goto out;
|
|
status = -NFS4ERR_STALE_CLIENTID;
|
|
spin_lock(&nn->nfs_client_lock);
|
|
}
|
|
if (pos->cl_cons_state != NFS_CS_READY)
|
|
continue;
|
|
|
|
if (pos->cl_clientid != new->cl_clientid)
|
|
continue;
|
|
|
|
if (!nfs4_match_client_owner_id(pos, new))
|
|
continue;
|
|
|
|
atomic_inc(&pos->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
|
|
nfs_put_client(prev);
|
|
prev = pos;
|
|
|
|
status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
|
|
switch (status) {
|
|
case -NFS4ERR_STALE_CLIENTID:
|
|
break;
|
|
case 0:
|
|
nfs4_swap_callback_idents(pos, new);
|
|
|
|
prev = NULL;
|
|
*result = pos;
|
|
dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
|
|
__func__, pos, atomic_read(&pos->cl_count));
|
|
goto out;
|
|
case -ERESTARTSYS:
|
|
case -ETIMEDOUT:
|
|
/* The callback path may have been inadvertently
|
|
* changed. Schedule recovery!
|
|
*/
|
|
nfs4_schedule_path_down_recovery(pos);
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&nn->nfs_client_lock);
|
|
}
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
|
|
/* No match found. The server lost our clientid */
|
|
out:
|
|
nfs_put_client(prev);
|
|
dprintk("NFS: <-- %s status = %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4_1
|
|
/*
|
|
* Returns true if the client IDs match
|
|
*/
|
|
static bool nfs4_match_clientids(u64 a, u64 b)
|
|
{
|
|
if (a != b) {
|
|
dprintk("NFS: --> %s client ID %llx does not match %llx\n",
|
|
__func__, a, b);
|
|
return false;
|
|
}
|
|
dprintk("NFS: --> %s client ID %llx matches %llx\n",
|
|
__func__, a, b);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Returns true if the server major ids match
|
|
*/
|
|
static bool
|
|
nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
|
|
struct nfs41_server_owner *o2)
|
|
{
|
|
if (o1->major_id_sz != o2->major_id_sz)
|
|
goto out_major_mismatch;
|
|
if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
|
|
goto out_major_mismatch;
|
|
|
|
dprintk("NFS: --> %s server owner major IDs match\n", __func__);
|
|
return true;
|
|
|
|
out_major_mismatch:
|
|
dprintk("NFS: --> %s server owner major IDs do not match\n",
|
|
__func__);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Returns true if server minor ids match
|
|
*/
|
|
static bool
|
|
nfs4_check_serverowner_minor_id(struct nfs41_server_owner *o1,
|
|
struct nfs41_server_owner *o2)
|
|
{
|
|
/* Check eir_server_owner so_minor_id */
|
|
if (o1->minor_id != o2->minor_id)
|
|
goto out_minor_mismatch;
|
|
|
|
dprintk("NFS: --> %s server owner minor IDs match\n", __func__);
|
|
return true;
|
|
|
|
out_minor_mismatch:
|
|
dprintk("NFS: --> %s server owner minor IDs do not match\n", __func__);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Returns true if the server scopes match
|
|
*/
|
|
static bool
|
|
nfs4_check_server_scope(struct nfs41_server_scope *s1,
|
|
struct nfs41_server_scope *s2)
|
|
{
|
|
if (s1->server_scope_sz != s2->server_scope_sz)
|
|
goto out_scope_mismatch;
|
|
if (memcmp(s1->server_scope, s2->server_scope,
|
|
s1->server_scope_sz) != 0)
|
|
goto out_scope_mismatch;
|
|
|
|
dprintk("NFS: --> %s server scopes match\n", __func__);
|
|
return true;
|
|
|
|
out_scope_mismatch:
|
|
dprintk("NFS: --> %s server scopes do not match\n",
|
|
__func__);
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* nfs4_detect_session_trunking - Checks for session trunking.
|
|
*
|
|
* Called after a successful EXCHANGE_ID on a multi-addr connection.
|
|
* Upon success, add the transport.
|
|
*
|
|
* @clp: original mount nfs_client
|
|
* @res: result structure from an exchange_id using the original mount
|
|
* nfs_client with a new multi_addr transport
|
|
*
|
|
* Returns zero on success, otherwise -EINVAL
|
|
*
|
|
* Note: since the exchange_id for the new multi_addr transport uses the
|
|
* same nfs_client from the original mount, the cl_owner_id is reused,
|
|
* so eir_clientowner is the same.
|
|
*/
|
|
int nfs4_detect_session_trunking(struct nfs_client *clp,
|
|
struct nfs41_exchange_id_res *res,
|
|
struct rpc_xprt *xprt)
|
|
{
|
|
/* Check eir_clientid */
|
|
if (!nfs4_match_clientids(clp->cl_clientid, res->clientid))
|
|
goto out_err;
|
|
|
|
/* Check eir_server_owner so_major_id */
|
|
if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
|
|
res->server_owner))
|
|
goto out_err;
|
|
|
|
/* Check eir_server_owner so_minor_id */
|
|
if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner,
|
|
res->server_owner))
|
|
goto out_err;
|
|
|
|
/* Check eir_server_scope */
|
|
if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
|
|
goto out_err;
|
|
|
|
/* Session trunking passed, add the xprt */
|
|
rpc_clnt_xprt_switch_add_xprt(clp->cl_rpcclient, xprt);
|
|
|
|
pr_info("NFS: %s: Session trunking succeeded for %s\n",
|
|
clp->cl_hostname,
|
|
xprt->address_strings[RPC_DISPLAY_ADDR]);
|
|
|
|
return 0;
|
|
out_err:
|
|
pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
|
|
xprt->address_strings[RPC_DISPLAY_ADDR]);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* nfs41_walk_client_list - Find nfs_client that matches a client/server owner
|
|
*
|
|
* @new: nfs_client with client ID to test
|
|
* @result: OUT: found nfs_client, or new
|
|
* @cred: credential to use for trunking test
|
|
*
|
|
* Returns zero, a negative errno, or a negative NFS4ERR status.
|
|
* If zero is returned, an nfs_client pointer is planted in "result."
|
|
*
|
|
* NB: nfs41_walk_client_list() relies on the new nfs_client being
|
|
* the last nfs_client on the list.
|
|
*/
|
|
int nfs41_walk_client_list(struct nfs_client *new,
|
|
struct nfs_client **result,
|
|
struct rpc_cred *cred)
|
|
{
|
|
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
|
|
struct nfs_client *pos, *prev = NULL;
|
|
int status = -NFS4ERR_STALE_CLIENTID;
|
|
|
|
spin_lock(&nn->nfs_client_lock);
|
|
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
|
|
|
|
if (pos == new)
|
|
goto found;
|
|
|
|
if (pos->rpc_ops != new->rpc_ops)
|
|
continue;
|
|
|
|
if (pos->cl_minorversion != new->cl_minorversion)
|
|
continue;
|
|
|
|
/* If "pos" isn't marked ready, we can't trust the
|
|
* remaining fields in "pos", especially the client
|
|
* ID and serverowner fields. Wait for CREATE_SESSION
|
|
* to finish. */
|
|
if (pos->cl_cons_state > NFS_CS_READY) {
|
|
atomic_inc(&pos->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
|
|
nfs_put_client(prev);
|
|
prev = pos;
|
|
|
|
status = nfs_wait_client_init_complete(pos);
|
|
spin_lock(&nn->nfs_client_lock);
|
|
if (status < 0)
|
|
break;
|
|
status = -NFS4ERR_STALE_CLIENTID;
|
|
}
|
|
if (pos->cl_cons_state != NFS_CS_READY)
|
|
continue;
|
|
|
|
if (!nfs4_match_clientids(pos->cl_clientid, new->cl_clientid))
|
|
continue;
|
|
|
|
/*
|
|
* Note that session trunking is just a special subcase of
|
|
* client id trunking. In either case, we want to fall back
|
|
* to using the existing nfs_client.
|
|
*/
|
|
if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
|
|
new->cl_serverowner))
|
|
continue;
|
|
|
|
/* Unlike NFSv4.0, we know that NFSv4.1 always uses the
|
|
* uniform string, however someone might switch the
|
|
* uniquifier string on us.
|
|
*/
|
|
if (!nfs4_match_client_owner_id(pos, new))
|
|
continue;
|
|
found:
|
|
atomic_inc(&pos->cl_count);
|
|
*result = pos;
|
|
status = 0;
|
|
dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
|
|
__func__, pos, atomic_read(&pos->cl_count));
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
dprintk("NFS: <-- %s status = %d\n", __func__, status);
|
|
nfs_put_client(prev);
|
|
return status;
|
|
}
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
static void nfs4_destroy_server(struct nfs_server *server)
|
|
{
|
|
nfs_server_return_all_delegations(server);
|
|
unset_pnfs_layoutdriver(server);
|
|
nfs4_purge_state_owners(server);
|
|
}
|
|
|
|
/*
|
|
* NFSv4.0 callback thread helper
|
|
*
|
|
* Find a client by callback identifier
|
|
*/
|
|
struct nfs_client *
|
|
nfs4_find_client_ident(struct net *net, int cb_ident)
|
|
{
|
|
struct nfs_client *clp;
|
|
struct nfs_net *nn = net_generic(net, nfs_net_id);
|
|
|
|
spin_lock(&nn->nfs_client_lock);
|
|
clp = idr_find(&nn->cb_ident_idr, cb_ident);
|
|
if (clp)
|
|
atomic_inc(&clp->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
return clp;
|
|
}
|
|
|
|
#if defined(CONFIG_NFS_V4_1)
|
|
/* Common match routine for v4.0 and v4.1 callback services */
|
|
static bool nfs4_cb_match_client(const struct sockaddr *addr,
|
|
struct nfs_client *clp, u32 minorversion)
|
|
{
|
|
struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
|
|
|
|
/* Don't match clients that failed to initialise */
|
|
if (!(clp->cl_cons_state == NFS_CS_READY ||
|
|
clp->cl_cons_state == NFS_CS_SESSION_INITING))
|
|
return false;
|
|
|
|
smp_rmb();
|
|
|
|
/* Match the version and minorversion */
|
|
if (clp->rpc_ops->version != 4 ||
|
|
clp->cl_minorversion != minorversion)
|
|
return false;
|
|
|
|
/* Match only the IP address, not the port number */
|
|
return rpc_cmp_addr(addr, clap);
|
|
}
|
|
|
|
/*
|
|
* NFSv4.1 callback thread helper
|
|
* For CB_COMPOUND calls, find a client by IP address, protocol version,
|
|
* minorversion, and sessionID
|
|
*
|
|
* Returns NULL if no such client
|
|
*/
|
|
struct nfs_client *
|
|
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
|
|
struct nfs4_sessionid *sid, u32 minorversion)
|
|
{
|
|
struct nfs_client *clp;
|
|
struct nfs_net *nn = net_generic(net, nfs_net_id);
|
|
|
|
spin_lock(&nn->nfs_client_lock);
|
|
list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
|
|
if (nfs4_cb_match_client(addr, clp, minorversion) == false)
|
|
continue;
|
|
|
|
if (!nfs4_has_session(clp))
|
|
continue;
|
|
|
|
/* Match sessionid*/
|
|
if (memcmp(clp->cl_session->sess_id.data,
|
|
sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
|
|
continue;
|
|
|
|
atomic_inc(&clp->cl_count);
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
return clp;
|
|
}
|
|
spin_unlock(&nn->nfs_client_lock);
|
|
return NULL;
|
|
}
|
|
|
|
#else /* CONFIG_NFS_V4_1 */
|
|
|
|
struct nfs_client *
|
|
nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
|
|
struct nfs4_sessionid *sid, u32 minorversion)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
|
|
/*
|
|
* Set up an NFS4 client
|
|
*/
|
|
static int nfs4_set_client(struct nfs_server *server,
|
|
const char *hostname,
|
|
const struct sockaddr *addr,
|
|
const size_t addrlen,
|
|
const char *ip_addr,
|
|
rpc_authflavor_t authflavour,
|
|
int proto, const struct rpc_timeout *timeparms,
|
|
u32 minorversion, struct net *net)
|
|
{
|
|
struct nfs_client_initdata cl_init = {
|
|
.hostname = hostname,
|
|
.addr = addr,
|
|
.addrlen = addrlen,
|
|
.ip_addr = ip_addr,
|
|
.nfs_mod = &nfs_v4,
|
|
.proto = proto,
|
|
.minorversion = minorversion,
|
|
.net = net,
|
|
.timeparms = timeparms,
|
|
};
|
|
struct nfs_client *clp;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_set_client()\n");
|
|
|
|
if (server->flags & NFS_MOUNT_NORESVPORT)
|
|
set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
|
|
if (server->options & NFS_OPTION_MIGRATION)
|
|
set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
|
|
|
|
/* Allocate or find a client reference we can use */
|
|
clp = nfs_get_client(&cl_init, authflavour);
|
|
if (IS_ERR(clp)) {
|
|
error = PTR_ERR(clp);
|
|
goto error;
|
|
}
|
|
|
|
if (server->nfs_client == clp) {
|
|
error = -ELOOP;
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* Query for the lease time on clientid setup or renewal
|
|
*
|
|
* Note that this will be set on nfs_clients that were created
|
|
* only for the DS role and did not set this bit, but now will
|
|
* serve a dual role.
|
|
*/
|
|
set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
|
|
|
|
server->nfs_client = clp;
|
|
dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
|
|
return 0;
|
|
error:
|
|
dprintk("<-- nfs4_set_client() = xerror %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Set up a pNFS Data Server client.
|
|
*
|
|
* Return any existing nfs_client that matches server address,port,version
|
|
* and minorversion.
|
|
*
|
|
* For a new nfs_client, use a soft mount (default), a low retrans and a
|
|
* low timeout interval so that if a connection is lost, we retry through
|
|
* the MDS.
|
|
*/
|
|
struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
|
|
const struct sockaddr *ds_addr, int ds_addrlen,
|
|
int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
|
|
u32 minor_version, rpc_authflavor_t au_flavor)
|
|
{
|
|
struct rpc_timeout ds_timeout;
|
|
struct nfs_client *mds_clp = mds_srv->nfs_client;
|
|
struct nfs_client_initdata cl_init = {
|
|
.addr = ds_addr,
|
|
.addrlen = ds_addrlen,
|
|
.nodename = mds_clp->cl_rpcclient->cl_nodename,
|
|
.ip_addr = mds_clp->cl_ipaddr,
|
|
.nfs_mod = &nfs_v4,
|
|
.proto = ds_proto,
|
|
.minorversion = minor_version,
|
|
.net = mds_clp->cl_net,
|
|
.timeparms = &ds_timeout,
|
|
};
|
|
struct nfs_client *clp;
|
|
char buf[INET6_ADDRSTRLEN + 1];
|
|
|
|
if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
|
|
return ERR_PTR(-EINVAL);
|
|
cl_init.hostname = buf;
|
|
|
|
if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
|
|
__set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
|
|
|
|
/*
|
|
* Set an authflavor equual to the MDS value. Use the MDS nfs_client
|
|
* cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
|
|
* (section 13.1 RFC 5661).
|
|
*/
|
|
nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
|
|
clp = nfs_get_client(&cl_init, au_flavor);
|
|
|
|
dprintk("<-- %s %p\n", __func__, clp);
|
|
return clp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
|
|
|
|
/*
|
|
* Session has been established, and the client marked ready.
|
|
* Set the mount rsize and wsize with negotiated fore channel
|
|
* attributes which will be bound checked in nfs_server_set_fsinfo.
|
|
*/
|
|
static void nfs4_session_set_rwsize(struct nfs_server *server)
|
|
{
|
|
#ifdef CONFIG_NFS_V4_1
|
|
struct nfs4_session *sess;
|
|
u32 server_resp_sz;
|
|
u32 server_rqst_sz;
|
|
|
|
if (!nfs4_has_session(server->nfs_client))
|
|
return;
|
|
sess = server->nfs_client->cl_session;
|
|
server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
|
|
server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
|
|
|
|
if (server->rsize > server_resp_sz)
|
|
server->rsize = server_resp_sz;
|
|
if (server->wsize > server_rqst_sz)
|
|
server->wsize = server_rqst_sz;
|
|
#endif /* CONFIG_NFS_V4_1 */
|
|
}
|
|
|
|
static int nfs4_server_common_setup(struct nfs_server *server,
|
|
struct nfs_fh *mntfh, bool auth_probe)
|
|
{
|
|
struct nfs_fattr *fattr;
|
|
int error;
|
|
|
|
/* data servers support only a subset of NFSv4.1 */
|
|
if (is_ds_only_client(server->nfs_client))
|
|
return -EPROTONOSUPPORT;
|
|
|
|
fattr = nfs_alloc_fattr();
|
|
if (fattr == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* We must ensure the session is initialised first */
|
|
error = nfs4_init_session(server->nfs_client);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
/* Set the basic capabilities */
|
|
server->caps |= server->nfs_client->cl_mvops->init_caps;
|
|
if (server->flags & NFS_MOUNT_NORDIRPLUS)
|
|
server->caps &= ~NFS_CAP_READDIRPLUS;
|
|
/*
|
|
* Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
|
|
* authentication.
|
|
*/
|
|
if (nfs4_disable_idmapping &&
|
|
server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
|
|
server->caps |= NFS_CAP_UIDGID_NOMAP;
|
|
|
|
|
|
/* Probe the root fh to retrieve its FSID and filehandle */
|
|
error = nfs4_get_rootfh(server, mntfh, auth_probe);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
dprintk("Server FSID: %llx:%llx\n",
|
|
(unsigned long long) server->fsid.major,
|
|
(unsigned long long) server->fsid.minor);
|
|
nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
|
|
|
|
nfs4_session_set_rwsize(server);
|
|
|
|
error = nfs_probe_fsinfo(server, mntfh, fattr);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
|
|
server->namelen = NFS4_MAXNAMLEN;
|
|
|
|
nfs_server_insert_lists(server);
|
|
server->mount_time = jiffies;
|
|
server->destroy = nfs4_destroy_server;
|
|
out:
|
|
nfs_free_fattr(fattr);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Create a version 4 volume record
|
|
*/
|
|
static int nfs4_init_server(struct nfs_server *server,
|
|
struct nfs_parsed_mount_data *data)
|
|
{
|
|
struct rpc_timeout timeparms;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_init_server()\n");
|
|
|
|
nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
|
|
data->timeo, data->retrans);
|
|
|
|
/* Initialise the client representation from the mount data */
|
|
server->flags = data->flags;
|
|
server->options = data->options;
|
|
server->auth_info = data->auth_info;
|
|
|
|
/* Use the first specified auth flavor. If this flavor isn't
|
|
* allowed by the server, use the SECINFO path to try the
|
|
* other specified flavors */
|
|
if (data->auth_info.flavor_len >= 1)
|
|
data->selected_flavor = data->auth_info.flavors[0];
|
|
else
|
|
data->selected_flavor = RPC_AUTH_UNIX;
|
|
|
|
/* Get a client record */
|
|
error = nfs4_set_client(server,
|
|
data->nfs_server.hostname,
|
|
(const struct sockaddr *)&data->nfs_server.address,
|
|
data->nfs_server.addrlen,
|
|
data->client_address,
|
|
data->selected_flavor,
|
|
data->nfs_server.protocol,
|
|
&timeparms,
|
|
data->minorversion,
|
|
data->net);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
if (data->rsize)
|
|
server->rsize = nfs_block_size(data->rsize, NULL);
|
|
if (data->wsize)
|
|
server->wsize = nfs_block_size(data->wsize, NULL);
|
|
|
|
server->acregmin = data->acregmin * HZ;
|
|
server->acregmax = data->acregmax * HZ;
|
|
server->acdirmin = data->acdirmin * HZ;
|
|
server->acdirmax = data->acdirmax * HZ;
|
|
|
|
server->port = data->nfs_server.port;
|
|
|
|
error = nfs_init_server_rpcclient(server, &timeparms,
|
|
data->selected_flavor);
|
|
|
|
error:
|
|
/* Done */
|
|
dprintk("<-- nfs4_init_server() = %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Create a version 4 volume record
|
|
* - keyed on server and FSID
|
|
*/
|
|
/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
|
|
struct nfs_fh *mntfh)*/
|
|
struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
|
|
struct nfs_subversion *nfs_mod)
|
|
{
|
|
struct nfs_server *server;
|
|
bool auth_probe;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_create_server()\n");
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
|
|
|
|
/* set up the general RPC client */
|
|
error = nfs4_init_server(server, mount_info->parsed);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
dprintk("<-- nfs4_create_server() = %p\n", server);
|
|
return server;
|
|
|
|
error:
|
|
nfs_free_server(server);
|
|
dprintk("<-- nfs4_create_server() = error %d\n", error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Create an NFS4 referral server record
|
|
*/
|
|
struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
|
|
struct nfs_fh *mntfh)
|
|
{
|
|
struct nfs_client *parent_client;
|
|
struct nfs_server *server, *parent_server;
|
|
bool auth_probe;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_create_referral_server()\n");
|
|
|
|
server = nfs_alloc_server();
|
|
if (!server)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
parent_server = NFS_SB(data->sb);
|
|
parent_client = parent_server->nfs_client;
|
|
|
|
/* Initialise the client representation from the parent server */
|
|
nfs_server_copy_userdata(server, parent_server);
|
|
|
|
/* Get a client representation.
|
|
* Note: NFSv4 always uses TCP, */
|
|
error = nfs4_set_client(server, data->hostname,
|
|
data->addr,
|
|
data->addrlen,
|
|
parent_client->cl_ipaddr,
|
|
data->authflavor,
|
|
rpc_protocol(parent_server->client),
|
|
parent_server->client->cl_timeout,
|
|
parent_client->cl_mvops->minor_version,
|
|
parent_client->cl_net);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
auth_probe = parent_server->auth_info.flavor_len < 1;
|
|
|
|
error = nfs4_server_common_setup(server, mntfh, auth_probe);
|
|
if (error < 0)
|
|
goto error;
|
|
|
|
dprintk("<-- nfs_create_referral_server() = %p\n", server);
|
|
return server;
|
|
|
|
error:
|
|
nfs_free_server(server);
|
|
dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Grab the destination's particulars, including lease expiry time.
|
|
*
|
|
* Returns zero if probe succeeded and retrieved FSID matches the FSID
|
|
* we have cached.
|
|
*/
|
|
static int nfs_probe_destination(struct nfs_server *server)
|
|
{
|
|
struct inode *inode = d_inode(server->super->s_root);
|
|
struct nfs_fattr *fattr;
|
|
int error;
|
|
|
|
fattr = nfs_alloc_fattr();
|
|
if (fattr == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Sanity: the probe won't work if the destination server
|
|
* does not recognize the migrated FH. */
|
|
error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
|
|
|
|
nfs_free_fattr(fattr);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* nfs4_update_server - Move an nfs_server to a different nfs_client
|
|
*
|
|
* @server: represents FSID to be moved
|
|
* @hostname: new end-point's hostname
|
|
* @sap: new end-point's socket address
|
|
* @salen: size of "sap"
|
|
* @net: net namespace
|
|
*
|
|
* The nfs_server must be quiescent before this function is invoked.
|
|
* Either its session is drained (NFSv4.1+), or its transport is
|
|
* plugged and drained (NFSv4.0).
|
|
*
|
|
* Returns zero on success, or a negative errno value.
|
|
*/
|
|
int nfs4_update_server(struct nfs_server *server, const char *hostname,
|
|
struct sockaddr *sap, size_t salen, struct net *net)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct rpc_clnt *clnt = server->client;
|
|
struct xprt_create xargs = {
|
|
.ident = clp->cl_proto,
|
|
.net = net,
|
|
.dstaddr = sap,
|
|
.addrlen = salen,
|
|
.servername = hostname,
|
|
};
|
|
char buf[INET6_ADDRSTRLEN + 1];
|
|
struct sockaddr_storage address;
|
|
struct sockaddr *localaddr = (struct sockaddr *)&address;
|
|
int error;
|
|
|
|
dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
|
|
(unsigned long long)server->fsid.major,
|
|
(unsigned long long)server->fsid.minor,
|
|
hostname);
|
|
|
|
error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
|
|
if (error != 0) {
|
|
dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
|
|
__func__, error);
|
|
goto out;
|
|
}
|
|
|
|
error = rpc_localaddr(clnt, localaddr, sizeof(address));
|
|
if (error != 0) {
|
|
dprintk("<-- %s(): rpc_localaddr returned %d\n",
|
|
__func__, error);
|
|
goto out;
|
|
}
|
|
|
|
error = -EAFNOSUPPORT;
|
|
if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
|
|
dprintk("<-- %s(): rpc_ntop returned %d\n",
|
|
__func__, error);
|
|
goto out;
|
|
}
|
|
|
|
nfs_server_remove_lists(server);
|
|
error = nfs4_set_client(server, hostname, sap, salen, buf,
|
|
clp->cl_rpcclient->cl_auth->au_flavor,
|
|
clp->cl_proto, clnt->cl_timeout,
|
|
clp->cl_minorversion, net);
|
|
nfs_put_client(clp);
|
|
if (error != 0) {
|
|
nfs_server_insert_lists(server);
|
|
dprintk("<-- %s(): nfs4_set_client returned %d\n",
|
|
__func__, error);
|
|
goto out;
|
|
}
|
|
|
|
if (server->nfs_client->cl_hostname == NULL)
|
|
server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
|
|
nfs_server_insert_lists(server);
|
|
|
|
error = nfs_probe_destination(server);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
dprintk("<-- %s() succeeded\n", __func__);
|
|
|
|
out:
|
|
return error;
|
|
}
|