| /* |
| * 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_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 "internal.h" |
| #include "callback.h" |
| #include "delegation.h" |
| #include "nfs4session.h" |
| #include "nfs4idmap.h" |
| #include "pnfs.h" |
| #include "netns.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_CLIENT |
| |
| /* |
| * 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; |
| idr_preload(GFP_KERNEL); |
| spin_lock(&nn->nfs_client_lock); |
| 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); |
| idr_preload_end(); |
| return ret < 0 ? ret : 0; |
| } |
| |
| #ifdef CONFIG_NFS_V4_1 |
| /** |
| * 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; |
| }; |
| |
| /** |
| * Common lookup case for DS I/O |
| */ |
| 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); |
| } |
| |
| /** |
| * 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; |
| LIST_HEAD(shutdown_list); |
| |
| 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); |
| } |
| } |
| |
| void nfs41_shutdown_client(struct nfs_client *clp) |
| { |
| if (nfs4_has_session(clp)) { |
| nfs4_shutdown_ds_clients(clp); |
| nfs4_destroy_session(clp->cl_session); |
| nfs4_destroy_clientid(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); |
| } |
| } |
| |
| 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; |
| |
| if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) { |
| err = -EINVAL; |
| goto error; |
| } |
| |
| 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; |
| return clp; |
| |
| error: |
| nfs_free_client(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, clp->cl_net); |
| } |
| |
| 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); |
| 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); |
| |
| rpc_destroy_wait_queue(&clp->cl_rpcwaitq); |
| 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) |
| { |
| nfs4_shutdown_client(clp); |
| nfs_free_client(clp); |
| } |
| |
| /* |
| * Initialize the NFS4 callback service |
| */ |
| static int nfs4_init_callback(struct nfs_client *clp) |
| { |
| struct rpc_xprt *xprt; |
| int error; |
| |
| 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; |
| } |
| |
| /** |
| * 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) { |
| 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) |
| { |
| int ret; |
| |
| ret = clp->cl_mvops->init_client(clp); |
| if (ret) |
| return ret; |
| 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) |
| { |
| char buf[INET6_ADDRSTRLEN + 1]; |
| struct nfs_client *old; |
| 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; |
| |
| if (clp->cl_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); |
| |
| 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; |
| |
| if (clp != old) |
| clp->cl_preserve_clid = true; |
| 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); |
| } |
| |
| /* |
| * SETCLIENTID just did a callback update with the callback ident in |
| * "drop," but server trunking discovery claims "drop" and "keep" are |
| * actually the same server. Swap the callback IDs so that "keep" |
| * will continue to use the callback ident the server now knows about, |
| * and so that "keep"'s original callback ident is destroyed when |
| * "drop" is freed. |
| */ |
| static void nfs4_swap_callback_idents(struct nfs_client *keep, |
| struct nfs_client *drop) |
| { |
| struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); |
| unsigned int save = keep->cl_cb_ident; |
| |
| if (keep->cl_cb_ident == drop->cl_cb_ident) |
| return; |
| |
| dprintk("%s: keeping callback ident %u and dropping ident %u\n", |
| __func__, keep->cl_cb_ident, drop->cl_cb_ident); |
| |
| spin_lock(&nn->nfs_client_lock); |
| |
| idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); |
| keep->cl_cb_ident = drop->cl_cb_ident; |
| |
| idr_replace(&nn->cb_ident_idr, drop, save); |
| drop->cl_cb_ident = save; |
| |
| 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; |
| } |
| |
| /** |
| * nfs40_walk_client_list - Find server that recognizes a client ID |
| * |
| * @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: nfs40_walk_client_list() relies on the new nfs_client being |
| * the last nfs_client on the list. |
| */ |
| int nfs40_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; |
| 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(struct nfs_client *a, struct nfs_client *b) |
| { |
| 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); |
| return false; |
| } |
| dprintk("NFS: --> %s client ID %llx matches %llx\n", |
| __func__, a->cl_clientid, b->cl_clientid); |
| return true; |
| } |
| |
| /* |
| * Returns true if the server major ids match |
| */ |
| static bool |
| nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b) |
| { |
| struct nfs41_server_owner *o1 = a->cl_serverowner; |
| struct nfs41_server_owner *o2 = b->cl_serverowner; |
| |
| 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 owners match\n", __func__); |
| return true; |
| |
| out_major_mismatch: |
| dprintk("NFS: --> %s server owner major IDs do not match\n", |
| __func__); |
| return false; |
| } |
| |
| /** |
| * 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, new)) |
| 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_clientid_trunking(pos, new)) |
| 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; |
| } |
| |
| /* No matching nfs_client found. */ |
| 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 */ |
| 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, 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, |
| .nfs_mod = &nfs_v4, |
| .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); |
| 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, 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, |
| u32 minor_version, rpc_authflavor_t au_flavor) |
| { |
| struct nfs_client_initdata cl_init = { |
| .addr = ds_addr, |
| .addrlen = ds_addrlen, |
| .nfs_mod = &nfs_v4, |
| .proto = ds_proto, |
| .minorversion = minor_version, |
| .net = mds_clp->cl_net, |
| }; |
| struct rpc_timeout 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; |
| |
| /* |
| * 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, |
| 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; |
| } |