1 files changed, 663 insertions, 0 deletions

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
new file mode 100644
index 000000000000..1c3f13c8e472
--- /dev/null
+++ b/fs/nfs/nfs4client.c
@@ -0,0 +1,663 @@
+/*
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#include <linux/module.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_idmap.h>
+#include <linux/nfs_mount.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/xprt.h>
+#include <linux/sunrpc/bc_xprt.h>
+#include "internal.h"
+#include "callback.h"
+#include "delegation.h"
+#include "pnfs.h"
+#include "netns.h"
+
+#define NFSDBG_FACILITY         NFSDBG_CLIENT
+
+/*
+ * Turn off NFSv4 uid/gid mapping when using AUTH_SYS
+ */
+static bool nfs4_disable_idmapping = true;
+
+/*
+ * Get a unique NFSv4.0 callback identifier which will be used
+ * by the V4.0 callback service to lookup the nfs_client struct
+ */
+static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
+{
+        int ret = 0;
+        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
+
+        if (clp->rpc_ops->version != 4 || minorversion != 0)
+                return ret;
+retry:
+        if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
+                return -ENOMEM;
+        spin_lock(&nn->nfs_client_lock);
+        ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
+        spin_unlock(&nn->nfs_client_lock);
+        if (ret == -EAGAIN)
+                goto retry;
+        return ret;
+}
+
+#ifdef CONFIG_NFS_V4_1
+static void nfs4_shutdown_session(struct nfs_client *clp)
+{
+        if (nfs4_has_session(clp)) {
+                nfs4_destroy_session(clp->cl_session);
+                nfs4_destroy_clientid(clp);
+        }
+
+}
+#else /* CONFIG_NFS_V4_1 */
+static void nfs4_shutdown_session(struct nfs_client *clp)
+{
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
+{
+        int err;
+        struct nfs_client *clp = nfs_alloc_client(cl_init);
+        if (IS_ERR(clp))
+                return clp;
+
+        err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
+        if (err)
+                goto error;
+
+        spin_lock_init(&clp->cl_lock);
+        INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
+        rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
+        clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
+        clp->cl_minorversion = cl_init->minorversion;
+        clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
+        return clp;
+
+error:
+        kfree(clp);
+        return ERR_PTR(err);
+}
+
+/*
+ * Destroy the NFS4 callback service
+ */
+static void nfs4_destroy_callback(struct nfs_client *clp)
+{
+        if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
+                nfs_callback_down(clp->cl_mvops->minor_version);
+}
+
+static void nfs4_shutdown_client(struct nfs_client *clp)
+{
+        if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
+                nfs4_kill_renewd(clp);
+        nfs4_shutdown_session(clp);
+        nfs4_destroy_callback(clp);
+        if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
+                nfs_idmap_delete(clp);
+
+        rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
+        kfree(clp->cl_serverowner);
+        kfree(clp->cl_serverscope);
+        kfree(clp->cl_implid);
+}
+
+void nfs4_free_client(struct nfs_client *clp)
+{
+        nfs4_shutdown_client(clp);
+        nfs_free_client(clp);
+}
+
+/*
+ * Initialize the NFS4 callback service
+ */
+static int nfs4_init_callback(struct nfs_client *clp)
+{
+        int error;
+
+        if (clp->rpc_ops->version == 4) {
+                struct rpc_xprt *xprt;
+
+                xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
+
+                if (nfs4_has_session(clp)) {
+                        error = xprt_setup_backchannel(xprt,
+                                                NFS41_BC_MIN_CALLBACKS);
+                        if (error < 0)
+                                return error;
+                }
+
+                error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
+                if (error < 0) {
+                        dprintk("%s: failed to start callback. Error = %d\n",
+                                __func__, error);
+                        return error;
+                }
+                __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
+        }
+        return 0;
+}
+
+/*
+ * Initialize the minor version specific parts of an NFS4 client record
+ */
+static int nfs4_init_client_minor_version(struct nfs_client *clp)
+{
+#if defined(CONFIG_NFS_V4_1)
+        if (clp->cl_mvops->minor_version) {
+                struct nfs4_session *session = NULL;
+                /*
+                 * Create the session and mark it expired.
+                 * When a SEQUENCE operation encounters the expired session
+                 * it will do session recovery to initialize it.
+                 */
+                session = nfs4_alloc_session(clp);
+                if (!session)
+                        return -ENOMEM;
+
+                clp->cl_session = session;
+                /*
+                 * The create session reply races with the server back
+                 * channel probe. Mark the client NFS_CS_SESSION_INITING
+                 * so that the client back channel can find the
+                 * nfs_client struct
+                 */
+                nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
+        }
+#endif /* CONFIG_NFS_V4_1 */
+
+        return nfs4_init_callback(clp);
+}
+
+/**
+ * nfs4_init_client - Initialise an NFS4 client record
+ *
+ * @clp: nfs_client to initialise
+ * @timeparms: timeout parameters for underlying RPC transport
+ * @ip_addr: callback IP address in presentation format
+ * @authflavor: authentication flavor for underlying RPC transport
+ *
+ * Returns pointer to an NFS client, or an ERR_PTR value.
+ */
+struct nfs_client *nfs4_init_client(struct nfs_client *clp,
+                                    const struct rpc_timeout *timeparms,
+                                    const char *ip_addr,
+                                    rpc_authflavor_t authflavour)
+{
+        char buf[INET6_ADDRSTRLEN + 1];
+        int error;
+
+        if (clp->cl_cons_state == NFS_CS_READY) {
+                /* the client is initialised already */
+                dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
+                return clp;
+        }
+
+        /* Check NFS protocol revision and initialize RPC op vector */
+        clp->rpc_ops = &nfs_v4_clientops;
+
+        __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
+        error = nfs_create_rpc_client(clp, timeparms, authflavour);
+        if (error < 0)
+                goto error;
+
+        /* If no clientaddr= option was specified, find a usable cb address */
+        if (ip_addr == NULL) {
+                struct sockaddr_storage cb_addr;
+                struct sockaddr *sap = (struct sockaddr *)&cb_addr;
+
+                error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
+                if (error < 0)
+                        goto error;
+                error = rpc_ntop(sap, buf, sizeof(buf));
+                if (error < 0)
+                        goto error;
+                ip_addr = (const char *)buf;
+        }
+        strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
+
+        error = nfs_idmap_new(clp);
+        if (error < 0) {
+                dprintk("%s: failed to create idmapper. Error = %d\n",
+                        __func__, error);
+                goto error;
+        }
+        __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
+
+        error = nfs4_init_client_minor_version(clp);
+        if (error < 0)
+                goto error;
+
+        if (!nfs4_has_session(clp))
+                nfs_mark_client_ready(clp, NFS_CS_READY);
+        return clp;
+
+error:
+        nfs_mark_client_ready(clp, error);
+        nfs_put_client(clp);
+        dprintk("<-- nfs4_init_client() = xerror %d\n", error);
+        return ERR_PTR(error);
+}
+
+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 */
+        if (!nfs_sockaddr_match_ipaddr(addr, clap))
+                return false;
+
+        return true;
+}
+
+/*
+ * 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)
+{
+        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, 1) == 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)
+{
+        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,
+                .rpc_ops = &nfs_v4_clientops,
+                .proto = proto,
+                .minorversion = minorversion,
+                .net = net,
+        };
+        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);
+
+        /* Allocate or find a client reference we can use */
+        clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
+        if (IS_ERR(clp)) {
+                error = PTR_ERR(clp);
+                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_client* mds_clp,
+                const struct sockaddr *ds_addr, int ds_addrlen,
+                int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
+{
+        struct nfs_client_initdata cl_init = {
+                .addr = ds_addr,
+                .addrlen = ds_addrlen,
+                .rpc_ops = &nfs_v4_clientops,
+                .proto = ds_proto,
+                .minorversion = mds_clp->cl_minorversion,
+                .net = mds_clp->cl_net,
+        };
+        struct rpc_timeout ds_timeout;
+        struct nfs_client *clp;
+
+        /*
+         * 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, &ds_timeout, mds_clp->cl_ipaddr,
+                             mds_clp->cl_rpcclient->cl_auth->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)
+{
+        struct nfs_fattr *fattr;
+        int error;
+
+        BUG_ON(!server->nfs_client);
+        BUG_ON(!server->nfs_client->rpc_ops);
+        BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
+
+        /* 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);
+        if (error < 0)
+                goto out;
+
+        /* Probe the root fh to retrieve its FSID and filehandle */
+        error = nfs4_get_rootfh(server, mntfh);
+        if (error < 0)
+                goto out;
+
+        dprintk("Server FSID: %llx:%llx\n",
+                        (unsigned long long) server->fsid.major,
+                        (unsigned long long) server->fsid.minor);
+        dprintk("Mount FH: %d\n", mntfh->size);
+
+        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,
+                const 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->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
+        if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
+                        server->caps |= NFS_CAP_READDIRPLUS;
+        server->options = data->options;
+
+        /* 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->auth_flavors[0],
+                        data->nfs_server.protocol,
+                        &timeparms,
+                        data->minorversion,
+                        data->net);
+        if (error < 0)
+                goto error;
+
+        /*
+         * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
+         * authentication.
+         */
+        if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
+                server->caps |= NFS_CAP_UIDGID_NOMAP;
+
+        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->auth_flavors[0]);
+
+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 *server;
+        int error;
+
+        dprintk("--> nfs4_create_server()\n");
+
+        server = nfs_alloc_server();
+        if (!server)
+                return ERR_PTR(-ENOMEM);
+
+        /* set up the general RPC client */
+        error = nfs4_init_server(server, data);
+        if (error < 0)
+                goto error;
+
+        error = nfs4_server_common_setup(server, mntfh);
+        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;
+        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);
+        server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
+
+        /* 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;
+
+        error = nfs4_server_common_setup(server, mntfh);
+        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);
+}
+
+module_param(nfs4_disable_idmapping, bool, 0644);
+MODULE_PARM_DESC(nfs4_disable_idmapping,
+                "Turn off NFSv4 idmapping when using 'sec=sys'");