diff options
Diffstat (limited to 'fs/nfs/nfs4client.c')
| -rw-r--r-- | fs/nfs/nfs4client.c | 1152 |
1 files changed, 801 insertions, 351 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 90dce91dd5b5..3a4baed993c9 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -1,21 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * 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/addr.h> #include <linux/sunrpc/auth.h> #include <linux/sunrpc/xprt.h> #include <linux/sunrpc/bc_xprt.h> +#include <linux/sunrpc/rpc_pipe_fs.h> +#include <net/handshake.h> #include "internal.h" #include "callback.h" #include "delegation.h" #include "nfs4session.h" +#include "nfs4idmap.h" #include "pnfs.h" #include "netns.h" +#include "sysfs.h" #define NFSDBG_FACILITY NFSDBG_CLIENT @@ -32,7 +36,7 @@ static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) return ret; idr_preload(GFP_KERNEL); spin_lock(&nn->nfs_client_lock); - ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT); + ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT); if (ret >= 0) clp->cl_cb_ident = ret; spin_unlock(&nn->nfs_client_lock); @@ -41,24 +45,165 @@ static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) } #ifdef CONFIG_NFS_V4_1 -static void nfs4_shutdown_session(struct nfs_client *clp) +/* + * Per auth flavor data server rpc clients + */ +struct nfs4_ds_server { + struct list_head list; /* ds_clp->cl_ds_clients */ + struct rpc_clnt *rpc_clnt; +}; + +/** + * nfs4_find_ds_client - Common lookup case for DS I/O + * @ds_clp: pointer to the DS's nfs_client + * @flavor: rpc auth flavour to match + */ +static struct nfs4_ds_server * +nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor) +{ + struct nfs4_ds_server *dss; + + rcu_read_lock(); + list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) { + if (dss->rpc_clnt->cl_auth->au_flavor != flavor) + continue; + goto out; + } + dss = NULL; +out: + rcu_read_unlock(); + return dss; +} + +static struct nfs4_ds_server * +nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor, + struct nfs4_ds_server *new) +{ + struct nfs4_ds_server *dss; + + spin_lock(&ds_clp->cl_lock); + list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) { + if (dss->rpc_clnt->cl_auth->au_flavor != flavor) + continue; + goto out; + } + if (new) + list_add_rcu(&new->list, &ds_clp->cl_ds_clients); + dss = new; +out: + spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ + return dss; +} + +static struct nfs4_ds_server * +nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor) +{ + struct nfs4_ds_server *dss; + + dss = kmalloc(sizeof(*dss), GFP_NOFS); + if (dss == NULL) + return ERR_PTR(-ENOMEM); + + dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor); + if (IS_ERR(dss->rpc_clnt)) { + int err = PTR_ERR(dss->rpc_clnt); + kfree (dss); + return ERR_PTR(err); + } + INIT_LIST_HEAD(&dss->list); + + return dss; +} + +static void +nfs4_free_ds_server(struct nfs4_ds_server *dss) +{ + rpc_release_client(dss->rpc_clnt); + kfree(dss); +} + +/** + * nfs4_find_or_create_ds_client - Find or create a DS rpc client + * @ds_clp: pointer to the DS's nfs_client + * @inode: pointer to the inode + * + * Find or create a DS rpc client with th MDS server rpc client auth flavor + * in the nfs_client cl_ds_clients list. + */ +struct rpc_clnt * +nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode) +{ + struct nfs4_ds_server *dss, *new; + rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor; + + dss = nfs4_find_ds_client(ds_clp, flavor); + if (dss != NULL) + goto out; + new = nfs4_alloc_ds_server(ds_clp, flavor); + if (IS_ERR(new)) + return ERR_CAST(new); + dss = nfs4_add_ds_client(ds_clp, flavor, new); + if (dss != new) + nfs4_free_ds_server(new); +out: + return dss->rpc_clnt; +} +EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); + +static void +nfs4_shutdown_ds_clients(struct nfs_client *clp) +{ + struct nfs4_ds_server *dss; + + while (!list_empty(&clp->cl_ds_clients)) { + dss = list_entry(clp->cl_ds_clients.next, + struct nfs4_ds_server, list); + list_del(&dss->list); + rpc_shutdown_client(dss->rpc_clnt); + kfree (dss); + } +} + +static void +nfs4_cleanup_callback(struct nfs_client *clp) +{ + struct nfs4_copy_state *cp_state; + + while (!list_empty(&clp->pending_cb_stateids)) { + cp_state = list_entry(clp->pending_cb_stateids.next, + struct nfs4_copy_state, copies); + list_del(&cp_state->copies); + kfree(cp_state); + } +} + +void nfs41_shutdown_client(struct nfs_client *clp) { if (nfs4_has_session(clp)) { + nfs4_cleanup_callback(clp); + nfs4_shutdown_ds_clients(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 */ + +void nfs40_shutdown_client(struct nfs_client *clp) { + if (clp->cl_slot_tbl) { + nfs4_shutdown_slot_table(clp->cl_slot_tbl); + kfree(clp->cl_slot_tbl); + } } -#endif /* CONFIG_NFS_V4_1 */ struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) { - int err; + char buf[INET6_ADDRSTRLEN + 1]; + const char *ip_addr = cl_init->ip_addr; struct nfs_client *clp = nfs_alloc_client(cl_init); + int err; + if (IS_ERR(clp)) return clp; @@ -73,10 +218,57 @@ struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) spin_lock_init(&clp->cl_lock); INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); + INIT_LIST_HEAD(&clp->cl_ds_clients); 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]; + clp->cl_mig_gen = 1; + clp->cl_last_renewal = jiffies; +#if IS_ENABLED(CONFIG_NFS_V4_1) + init_waitqueue_head(&clp->cl_lock_waitq); +#endif + INIT_LIST_HEAD(&clp->pending_cb_stateids); + + if (cl_init->minorversion != 0) + __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); + __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); + __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); + if (test_bit(NFS_CS_PNFS, &cl_init->init_flags)) + __set_bit(NFS_CS_PNFS, &clp->cl_flags); + if (test_bit(NFS_CS_NETUNREACH_FATAL, &cl_init->init_flags)) + __set_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags); + /* + * Set up the connection to the server before we add add to the + * global list. + */ + err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); + if (err == -EINVAL) + err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); + if (err < 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; + + err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); + if (err < 0) + goto error; + err = rpc_ntop(sap, buf, sizeof(buf)); + if (err < 0) + goto error; + ip_addr = (const char *)buf; + } + strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); + + err = nfs_idmap_new(clp); + if (err < 0) { + dprintk("%s: failed to create idmapper. Error = %d\n", + __func__, err); + goto error; + } + __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); return clp; error: @@ -97,7 +289,7 @@ 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); + clp->cl_mvops->shutdown_client(clp); nfs4_destroy_callback(clp); if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) nfs_idmap_delete(clp); @@ -106,6 +298,7 @@ static void nfs4_shutdown_client(struct nfs_client *clp) kfree(clp->cl_serverowner); kfree(clp->cl_serverscope); kfree(clp->cl_implid); + kfree(clp->cl_owner_id); } void nfs4_free_client(struct nfs_client *clp) @@ -119,144 +312,176 @@ void nfs4_free_client(struct nfs_client *clp) */ static int nfs4_init_callback(struct nfs_client *clp) { + struct rpc_xprt *xprt; int error; - if (clp->rpc_ops->version == 4) { - struct rpc_xprt *xprt; + xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_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; + } - 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); - 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; +} + +/** + * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 + * @clp: nfs_client to initialize + * + * Returns zero on success, or a negative errno if some error occurred. + */ +int nfs40_init_client(struct nfs_client *clp) +{ + struct nfs4_slot_table *tbl; + int ret; + + tbl = kzalloc(sizeof(*tbl), GFP_NOFS); + if (tbl == NULL) + return -ENOMEM; + + ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, + "NFSv4.0 transport Slot table"); + if (ret) { + nfs4_shutdown_slot_table(tbl); + kfree(tbl); + return ret; } + + clp->cl_slot_tbl = tbl; return 0; } +#if defined(CONFIG_NFS_V4_1) + +/** + * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ + * @clp: nfs_client to initialize + * + * Returns zero on success, or a negative errno if some error occurred. + */ +int nfs41_init_client(struct nfs_client *clp) +{ + 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); + return 0; +} + +#endif /* CONFIG_NFS_V4_1 */ + /* * 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 */ + int ret; + ret = clp->cl_mvops->init_client(clp); + if (ret) + return ret; return nfs4_init_callback(clp); } +static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old) +{ + struct sockaddr_storage clp_addr, old_addr; + struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr; + struct sockaddr *old_sap = (struct sockaddr *)&old_addr; + size_t clp_salen; + struct xprt_create xprt_args = { + .ident = old->cl_proto, + .net = old->cl_net, + .servername = old->cl_hostname, + }; + int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ? + clp->cl_max_connect : old->cl_max_connect; + + if (clp->cl_proto != old->cl_proto) + return; + clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr)); + rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr)); + + if (clp_addr.ss_family != old_addr.ss_family) + return; + + xprt_args.dstaddr = clp_sap; + xprt_args.addrlen = clp_salen; + + rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args, + rpc_clnt_test_and_add_xprt, &max_connect); +} + /** * 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 + * @cl_init: pointer to nfs_client_initdata * * 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) + const struct nfs_client_initdata *cl_init) { - char buf[INET6_ADDRSTRLEN + 1]; struct nfs_client *old; int error; - if (clp->cl_cons_state == NFS_CS_READY) { + 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; - - if (clp->cl_minorversion != 0) - __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); - __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); - error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I); - if (error == -EINVAL) - error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); - 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); - error = nfs4_discover_server_trunking(clp, &old); if (error < 0) goto error; - nfs_put_client(clp); + if (clp != old) { clp->cl_preserve_clid = true; - clp = old; + /* + * Mark the client as having failed initialization so other + * processes walking the nfs_client_list in nfs_match_client() + * won't try to use it. + */ + nfs_mark_client_ready(clp, -EPERM); + if (old->cl_mvops->session_trunk) + nfs4_add_trunk(clp, old); } - - return clp; + clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); + nfs_put_client(clp); + return old; error: nfs_mark_client_ready(clp, error); nfs_put_client(clp); - dprintk("<-- nfs4_init_client() = xerror %d\n", error); return ERR_PTR(error); } @@ -291,6 +516,63 @@ static void nfs4_swap_callback_idents(struct nfs_client *keep, spin_unlock(&nn->nfs_client_lock); } +static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, + const struct nfs_client *clp2) +{ + if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) + return true; + return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; +} + +static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) +{ + return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; +} + +static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, + struct nfs_client **prev, struct nfs_net *nn) +{ + int status; + + if (pos->rpc_ops != new->rpc_ops) + return 1; + + if (pos->cl_minorversion != new->cl_minorversion) + return 1; + + /* 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) { + refcount_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) + return status; + } + + if (pos->cl_cons_state != NFS_CS_READY) + return 1; + + if (pos->cl_clientid != new->cl_clientid) + return 1; + + /* NFSv4.1 always uses the uniform string, however someone + * might switch the uniquifier string on us. + */ + if (!nfs4_match_client_owner_id(pos, new)) + return 1; + + return 0; +} + /** * nfs40_walk_client_list - Find server that recognizes a client ID * @@ -306,7 +588,7 @@ static void nfs4_swap_callback_idents(struct nfs_client *keep, */ int nfs40_walk_client_list(struct nfs_client *new, struct nfs_client **result, - struct rpc_cred *cred) + const struct cred *cred) { struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); struct nfs_client *pos, *prev = NULL; @@ -318,41 +600,35 @@ int nfs40_walk_client_list(struct nfs_client *new, spin_lock(&nn->nfs_client_lock); list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { - /* 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); - - if (prev) - nfs_put_client(prev); - prev = pos; - - status = nfs_wait_client_init_complete(pos); - spin_lock(&nn->nfs_client_lock); - if (status < 0) - continue; - } - if (pos->cl_cons_state != NFS_CS_READY) - continue; - if (pos->rpc_ops != new->rpc_ops) - continue; + if (pos == new) + goto found; - if (pos->cl_proto != new->cl_proto) + status = nfs4_match_client(pos, new, &prev, nn); + if (status < 0) + goto out_unlock; + if (status != 0) continue; - - if (pos->cl_minorversion != new->cl_minorversion) - continue; - - if (pos->cl_clientid != new->cl_clientid) + /* + * We just sent a new SETCLIENTID, which should have + * caused the server to return a new cl_confirm. So if + * cl_confirm is the same, then this is a different + * server that just returned the same cl_confirm by + * coincidence: + */ + if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, + &new->cl_confirm)) continue; - - atomic_inc(&pos->cl_count); + /* + * But if the cl_confirm's are different, then the only + * way that a SETCLIENTID_CONFIRM to pos can succeed is + * if new and pos point to the same server: + */ +found: + refcount_inc(&pos->cl_count); spin_unlock(&nn->nfs_client_lock); - if (prev) - nfs_put_client(prev); + nfs_put_client(prev); prev = pos; status = nfs4_proc_setclientid_confirm(pos, &clid, cred); @@ -361,70 +637,107 @@ int nfs40_walk_client_list(struct nfs_client *new, break; case 0: nfs4_swap_callback_idents(pos, new); + pos->cl_confirm = new->cl_confirm; + nfs_mark_client_ready(pos, NFS_CS_READY); 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); + goto out; default: goto out; } spin_lock(&nn->nfs_client_lock); } +out_unlock: spin_unlock(&nn->nfs_client_lock); /* No match found. The server lost our clientid */ out: - if (prev) - nfs_put_client(prev); - dprintk("NFS: <-- %s status = %d\n", __func__, status); + nfs_put_client(prev); return status; } #ifdef CONFIG_NFS_V4_1 /* - * Returns true if the client IDs match + * Returns true if the server major ids match */ -static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b) +bool +nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, + struct nfs41_server_owner *o2) { - if (a->cl_clientid != b->cl_clientid) { - dprintk("NFS: --> %s client ID %llx does not match %llx\n", - __func__, a->cl_clientid, b->cl_clientid); + if (o1->major_id_sz != o2->major_id_sz) return false; - } - dprintk("NFS: --> %s client ID %llx matches %llx\n", - __func__, a->cl_clientid, b->cl_clientid); - return true; + return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; } /* - * Returns true if the server owners match + * Returns true if the server scopes match */ static bool -nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b) +nfs4_check_server_scope(struct nfs41_server_scope *s1, + struct nfs41_server_scope *s2) { - struct nfs41_server_owner *o1 = a->cl_serverowner; - struct nfs41_server_owner *o2 = b->cl_serverowner; - - if (o1->minor_id != o2->minor_id) { - dprintk("NFS: --> %s server owner minor IDs do not match\n", - __func__); + if (s1->server_scope_sz != s2->server_scope_sz) return false; - } + return memcmp(s1->server_scope, s2->server_scope, + s1->server_scope_sz) == 0; +} - 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; +/** + * nfs4_detect_session_trunking - Checks for session trunking. + * @clp: original mount nfs_client + * @res: result structure from an exchange_id using the original mount + * nfs_client with a new multi_addr transport + * @xprt: pointer to the transport to add. + * + * Called after a successful EXCHANGE_ID on a multi-addr connection. + * Upon success, add the 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 (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 (clp->cl_serverowner->minor_id != res->server_owner->minor_id) + goto out_err; + + /* Check eir_server_scope */ + if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) + goto out_err; - dprintk("NFS: --> %s server owners match\n", __func__); - return true; + pr_info("NFS: %s: Session trunking succeeded for %s\n", + clp->cl_hostname, + xprt->address_strings[RPC_DISPLAY_ADDR]); -out_major_mismatch: - dprintk("NFS: --> %s server owner major IDs do not match\n", - __func__); - return false; + 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; } /** @@ -442,7 +755,7 @@ out_major_mismatch: */ int nfs41_walk_client_list(struct nfs_client *new, struct nfs_client **result, - struct rpc_cred *cred) + const struct cred *cred) { struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); struct nfs_client *pos, *prev = NULL; @@ -450,67 +763,48 @@ int nfs41_walk_client_list(struct nfs_client *new, spin_lock(&nn->nfs_client_lock); list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { - /* 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); - - if (prev) - nfs_put_client(prev); - prev = pos; - - status = nfs_wait_client_init_complete(pos); - if (status == 0) { - nfs4_schedule_lease_recovery(pos); - status = nfs4_wait_clnt_recover(pos); - } - spin_lock(&nn->nfs_client_lock); - if (status < 0) - continue; - } - if (pos->cl_cons_state != NFS_CS_READY) - continue; - - if (pos->rpc_ops != new->rpc_ops) - continue; - - if (pos->cl_proto != new->cl_proto) - continue; - if (pos->cl_minorversion != new->cl_minorversion) - continue; + if (pos == new) + goto found; - if (!nfs4_match_clientids(pos, new)) + status = nfs4_match_client(pos, new, &prev, nn); + if (status < 0) + goto out; + if (status != 0) continue; - if (!nfs4_match_serverowners(pos, new)) + /* + * 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; - atomic_inc(&pos->cl_count); +found: + refcount_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; } - /* No matching nfs_client found. */ +out: spin_unlock(&nn->nfs_client_lock); - dprintk("NFS: <-- %s status = %d\n", __func__, status); - if (prev) - nfs_put_client(prev); + nfs_put_client(prev); return status; } #endif /* CONFIG_NFS_V4_1 */ static void nfs4_destroy_server(struct nfs_server *server) { + LIST_HEAD(freeme); + nfs_server_return_all_delegations(server); unset_pnfs_layoutdriver(server); - nfs4_purge_state_owners(server); + nfs4_purge_state_owners(server, &freeme); + nfs4_free_state_owners(&freeme); + kfree(server->delegation_hash_table); } /* @@ -527,7 +821,7 @@ nfs4_find_client_ident(struct net *net, int cb_ident) spin_lock(&nn->nfs_client_lock); clp = idr_find(&nn->cb_ident_idr, cb_ident); if (clp) - atomic_inc(&clp->cl_count); + refcount_inc(&clp->cl_count); spin_unlock(&nn->nfs_client_lock); return clp; } @@ -552,10 +846,7 @@ static bool nfs4_cb_match_client(const struct sockaddr *addr, return false; /* Match only the IP address, not the port number */ - if (!nfs_sockaddr_match_ipaddr(addr, clap)) - return false; - - return true; + return rpc_cmp_addr(addr, clap); } /* @@ -574,7 +865,7 @@ nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 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) + if (!nfs4_cb_match_client(addr, clp, minorversion)) continue; if (!nfs4_has_session(clp)) @@ -585,7 +876,7 @@ nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, sid->data, NFS4_MAX_SESSIONID_LEN) != 0) continue; - atomic_inc(&clp->cl_count); + refcount_inc(&clp->cl_count); spin_unlock(&nn->nfs_client_lock); return clp; } @@ -607,38 +898,46 @@ nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, * 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) { - struct nfs_client_initdata cl_init = { - .hostname = hostname, - .addr = addr, - .addrlen = addrlen, - .nfs_mod = &nfs_v4, - .proto = proto, - .minorversion = minorversion, - .net = net, - }; struct nfs_client *clp; - int error; - dprintk("--> nfs4_set_client()\n"); + cl_init->nfs_mod = &nfs_v4; + cl_init->cred = server->cred; + + if (cl_init->minorversion == 0) { + __set_bit(NFS_CS_REUSEPORT, &cl_init->init_flags); + cl_init->max_connect = 0; + } + + switch (cl_init->proto) { + case XPRT_TRANSPORT_RDMA: + case XPRT_TRANSPORT_TCP: + case XPRT_TRANSPORT_TCP_TLS: + break; + default: + cl_init->nconnect = 0; + } if (server->flags & NFS_MOUNT_NORESVPORT) - set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); + __set_bit(NFS_CS_NORESVPORT, &cl_init->init_flags); if (server->options & NFS_OPTION_MIGRATION) - set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); + __set_bit(NFS_CS_MIGRATION, &cl_init->init_flags); + if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) + __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init->init_flags); + server->port = rpc_get_port((struct sockaddr *)cl_init->addr); + + if (server->flags & NFS_MOUNT_NETUNREACH_FATAL) + __set_bit(NFS_CS_NETUNREACH_FATAL, &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; + clp = nfs_get_client(cl_init); + if (IS_ERR(clp)) + return PTR_ERR(clp); + + if (server->nfs_client == clp) { + nfs_put_client(clp); + return -ELOOP; } /* @@ -651,11 +950,10 @@ static int nfs4_set_client(struct nfs_server *server, set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); server->nfs_client = clp; - dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); + nfs_sysfs_add_server(server); + nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); + return 0; -error: - dprintk("<-- nfs4_set_client() = xerror %d\n", error); - return error; } /* @@ -668,41 +966,74 @@ error: * 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 *nfs4_set_ds_client(struct nfs_server *mds_srv, + const struct sockaddr_storage *ds_addr, int ds_addrlen, + int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, + u32 minor_version) { + 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 = mds_clp->cl_minorversion, + .minorversion = minor_version, .net = mds_clp->cl_net, + .timeparms = &ds_timeout, + .cred = mds_srv->cred, + .xprtsec = { + .policy = RPC_XPRTSEC_NONE, + .cert_serial = TLS_NO_CERT, + .privkey_serial = TLS_NO_PRIVKEY, + }, }; - struct rpc_timeout ds_timeout; - struct nfs_client *clp; + char buf[INET6_ADDRSTRLEN + 1]; + + if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0) + return ERR_PTR(-EINVAL); + cl_init.hostname = buf; + + switch (ds_proto) { + case XPRT_TRANSPORT_TCP_TLS: + if (mds_srv->nfs_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) + cl_init.xprtsec = mds_srv->nfs_client->cl_xprtsec; + else + ds_proto = XPRT_TRANSPORT_TCP; + fallthrough; + case XPRT_TRANSPORT_RDMA: + case XPRT_TRANSPORT_TCP: + if (mds_clp->cl_nconnect > 1) { + cl_init.nconnect = mds_clp->cl_nconnect; + cl_init.max_connect = NFS_MAX_TRANSPORTS; + } + } + + if (mds_srv->flags & NFS_MOUNT_NORESVPORT) + __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); + if (test_bit(NFS_CS_NETUNREACH_FATAL, &mds_clp->cl_flags)) + __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init.init_flags); + __set_bit(NFS_CS_PNFS, &cl_init.init_flags); + cl_init.max_connect = NFS_MAX_TRANSPORTS; /* * 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; + return nfs_get_client(&cl_init); } 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. + * Limit the mount rsize, wsize and dtsize using negotiated fore + * channel attributes. */ -static void nfs4_session_set_rwsize(struct nfs_server *server) +static void nfs4_session_limit_rwsize(struct nfs_server *server) { #ifdef CONFIG_NFS_V4_1 struct nfs4_session *sess; @@ -715,6 +1046,8 @@ static void nfs4_session_set_rwsize(struct nfs_server *server) 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->dtsize > server_resp_sz) + server->dtsize = server_resp_sz; if (server->rsize > server_resp_sz) server->rsize = server_resp_sz; if (server->wsize > server_rqst_sz) @@ -722,53 +1055,72 @@ static void nfs4_session_set_rwsize(struct nfs_server *server) #endif /* CONFIG_NFS_V4_1 */ } +/* + * Limit xattr sizes using the channel attributes. + */ +static void nfs4_session_limit_xasize(struct nfs_server *server) +{ +#ifdef CONFIG_NFS_V4_2 + struct nfs4_session *sess; + u32 server_gxa_sz; + u32 server_sxa_sz; + u32 server_lxa_sz; + + if (!nfs4_has_session(server->nfs_client)) + return; + + sess = server->nfs_client->cl_session; + + server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead; + server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead; + server_lxa_sz = sess->fc_attrs.max_resp_sz - + nfs42_maxlistxattrs_overhead; + + if (server->gxasize > server_gxa_sz) + server->gxasize = server_gxa_sz; + if (server->sxasize > server_sxa_sz) + server->sxasize = server_sxa_sz; + if (server->lxasize > server_lxa_sz) + server->lxasize = server_lxa_sz; +#endif +} + static int nfs4_server_common_setup(struct nfs_server *server, - struct nfs_fh *mntfh) + struct nfs_fh *mntfh, bool auth_probe) { - struct nfs_fattr *fattr; int error; + error = nfs4_delegation_hash_alloc(server); + if (error) + return 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; + return error; + nfs_server_set_init_caps(server); /* Probe the root fh to retrieve its FSID and filehandle */ - error = nfs4_get_rootfh(server, mntfh); + error = nfs4_get_rootfh(server, mntfh, auth_probe); if (error < 0) - goto out; + return error; 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); + nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); - error = nfs_probe_fsinfo(server, mntfh, fattr); + error = nfs_probe_server(server, mntfh); if (error < 0) - goto out; + return error; + + nfs4_session_limit_rwsize(server); + nfs4_session_limit_xasize(server); if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) server->namelen = NFS4_MAXNAMLEN; @@ -776,148 +1128,246 @@ static int nfs4_server_common_setup(struct nfs_server *server, nfs_server_insert_lists(server); server->mount_time = jiffies; server->destroy = nfs4_destroy_server; -out: - nfs_free_fattr(fattr); - return error; + return 0; } /* * Create a version 4 volume record */ -static int nfs4_init_server(struct nfs_server *server, - const struct nfs_parsed_mount_data *data) +static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc) { + struct nfs_fs_context *ctx = nfs_fc2context(fc); struct rpc_timeout timeparms; + struct nfs_client_initdata cl_init = { + .hostname = ctx->nfs_server.hostname, + .addr = &ctx->nfs_server._address, + .addrlen = ctx->nfs_server.addrlen, + .ip_addr = ctx->client_address, + .proto = ctx->nfs_server.protocol, + .minorversion = ctx->minorversion, + .net = fc->net_ns, + .timeparms = &timeparms, + .xprtsec = ctx->xprtsec, + .nconnect = ctx->nfs_server.nconnect, + .max_connect = ctx->nfs_server.max_connect, + }; int error; - dprintk("--> nfs4_init_server()\n"); - - nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, - data->timeo, data->retrans); + nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, + ctx->timeo, ctx->retrans); /* Initialise the client representation from the mount data */ - server->flags = data->flags; - server->options = data->options; + server->flags = ctx->flags; + server->options = ctx->options; + server->auth_info = ctx->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 (ctx->auth_info.flavor_len >= 1) + ctx->selected_flavor = ctx->auth_info.flavors[0]; + else + ctx->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->auth_flavors[0], - data->nfs_server.protocol, - &timeparms, - data->minorversion, - data->net); + error = nfs4_set_client(server, &cl_init); 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); + return error; - server->acregmin = data->acregmin * HZ; - server->acregmax = data->acregmax * HZ; - server->acdirmin = data->acdirmin * HZ; - server->acdirmax = data->acdirmax * HZ; + if (ctx->rsize) + server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto); + if (ctx->wsize) + server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto); - server->port = data->nfs_server.port; + server->acregmin = ctx->acregmin * HZ; + server->acregmax = ctx->acregmax * HZ; + server->acdirmin = ctx->acdirmin * HZ; + server->acdirmax = ctx->acdirmax * HZ; + server->port = ctx->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; + return nfs_init_server_rpcclient(server, &timeparms, + ctx->selected_flavor); } /* * 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 *nfs4_create_server(struct fs_context *fc) { + struct nfs_fs_context *ctx = nfs_fc2context(fc); struct nfs_server *server; + bool auth_probe; int error; - dprintk("--> nfs4_create_server()\n"); - server = nfs_alloc_server(); if (!server) return ERR_PTR(-ENOMEM); + server->cred = get_cred(fc->cred); + + auth_probe = ctx->auth_info.flavor_len < 1; + /* set up the general RPC client */ - error = nfs4_init_server(server, mount_info->parsed); + error = nfs4_init_server(server, fc); if (error < 0) goto error; - error = nfs4_server_common_setup(server, mount_info->mntfh); + error = nfs4_server_common_setup(server, ctx->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_server *nfs4_create_referral_server(struct fs_context *fc) { - struct nfs_client *parent_client; - struct nfs_server *server, *parent_server; + struct nfs_fs_context *ctx = nfs_fc2context(fc); + struct nfs_server *parent_server = NFS_SB(ctx->clone_data.sb); + struct nfs_client *parent_client = parent_server->nfs_client; + struct nfs_client_initdata cl_init = { + .hostname = ctx->nfs_server.hostname, + .addr = &ctx->nfs_server._address, + .addrlen = ctx->nfs_server.addrlen, + .ip_addr = parent_client->cl_ipaddr, + .minorversion = parent_client->cl_mvops->minor_version, + .net = parent_client->cl_net, + .timeparms = parent_server->client->cl_timeout, + .xprtsec = parent_client->cl_xprtsec, + .nconnect = parent_client->cl_nconnect, + .max_connect = parent_client->cl_max_connect, + }; + struct nfs_server *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; + server->cred = get_cred(parent_server->cred); /* 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); + /* Get a client representation */ +#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) + rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT); + cl_init.proto = XPRT_TRANSPORT_RDMA; + error = nfs4_set_client(server, &cl_init); + if (!error) + goto init_server; +#endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */ + + cl_init.proto = XPRT_TRANSPORT_TCP; + if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) + cl_init.proto = XPRT_TRANSPORT_TCP_TLS; + rpc_set_port(&ctx->nfs_server.address, NFS_PORT); + error = nfs4_set_client(server, &cl_init); if (error < 0) goto error; - error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); +#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) +init_server: +#endif + error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, + ctx->selected_flavor); if (error < 0) goto error; - error = nfs4_server_common_setup(server, mntfh); + auth_probe = parent_server->auth_info.flavor_len < 1; + + error = nfs4_server_common_setup(server, ctx->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); } + +/** + * 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_storage *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 = (struct sockaddr *)sap, + .addrlen = salen, + .servername = hostname, + /* cel: bleh. We might need to pass TLS parameters here */ + }; + char buf[INET6_ADDRSTRLEN + 1]; + struct sockaddr_storage address; + struct sockaddr *localaddr = (struct sockaddr *)&address; + struct nfs_client_initdata cl_init = { + .hostname = hostname, + .addr = sap, + .addrlen = salen, + .ip_addr = buf, + .proto = clp->cl_proto, + .minorversion = clp->cl_minorversion, + .net = net, + .timeparms = clnt->cl_timeout, + .xprtsec = clp->cl_xprtsec, + .nconnect = clp->cl_nconnect, + .max_connect = clp->cl_max_connect, + }; + int error; + + error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); + if (error != 0) + return error; + + error = rpc_localaddr(clnt, localaddr, sizeof(address)); + if (error != 0) + return error; + + if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) + return -EAFNOSUPPORT; + + nfs_server_remove_lists(server); + set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); + error = nfs4_set_client(server, &cl_init); + clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); + if (error != 0) { + nfs_server_insert_lists(server); + return error; + } + nfs_put_client(clp); + + if (server->nfs_client->cl_hostname == NULL) { + server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); + if (server->nfs_client->cl_hostname == NULL) + return -ENOMEM; + } + nfs_server_insert_lists(server); + + return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root))); +} |