/* client.c: NFS client sharing and management code * * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/time.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/stat.h> #include <linux/errno.h> #include <linux/unistd.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/stats.h> #include <linux/sunrpc/metrics.h> #include <linux/sunrpc/xprtsock.h> #include <linux/sunrpc/xprtrdma.h> #include <linux/nfs_fs.h> #include <linux/nfs_mount.h> #include <linux/nfs4_mount.h> #include <linux/lockd/bind.h> #include <linux/seq_file.h> #include <linux/mount.h> #include <linux/nfs_idmap.h> #include <linux/vfs.h> #include <linux/inet.h> #include <linux/in6.h> #include <linux/slab.h> #include <net/ipv6.h> #include <linux/nfs_xdr.h> #include <linux/sunrpc/bc_xprt.h> #include <asm/system.h> #include "nfs4_fs.h" #include "callback.h" #include "delegation.h" #include "iostat.h" #include "internal.h" #include "fscache.h" #define NFSDBG_FACILITY NFSDBG_CLIENT static DEFINE_SPINLOCK(nfs_client_lock); static LIST_HEAD(nfs_client_list); static LIST_HEAD(nfs_volume_list); static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); /* * RPC cruft for NFS */ static struct rpc_version *nfs_version[5] = { [2] = &nfs_version2, #ifdef CONFIG_NFS_V3 [3] = &nfs_version3, #endif #ifdef CONFIG_NFS_V4 [4] = &nfs_version4, #endif }; struct rpc_program nfs_program = { .name = "nfs", .number = NFS_PROGRAM, .nrvers = ARRAY_SIZE(nfs_version), .version = nfs_version, .stats = &nfs_rpcstat, .pipe_dir_name = "/nfs", }; struct rpc_stat nfs_rpcstat = { .program = &nfs_program }; #ifdef CONFIG_NFS_V3_ACL static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; static struct rpc_version * nfsacl_version[] = { [3] = &nfsacl_version3, }; struct rpc_program nfsacl_program = { .name = "nfsacl", .number = NFS_ACL_PROGRAM, .nrvers = ARRAY_SIZE(nfsacl_version), .version = nfsacl_version, .stats = &nfsacl_rpcstat, }; #endif /* CONFIG_NFS_V3_ACL */ struct nfs_client_initdata { const char *hostname; const struct sockaddr *addr; size_t addrlen; const struct nfs_rpc_ops *rpc_ops; int proto; u32 minorversion; }; /* * Allocate a shared client record * * Since these are allocated/deallocated very rarely, we don't * bother putting them in a slab cache... */ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) { struct nfs_client *clp; struct rpc_cred *cred; int err = -ENOMEM; if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) goto error_0; clp->rpc_ops = cl_init->rpc_ops; atomic_set(&clp->cl_count, 1); clp->cl_cons_state = NFS_CS_INITING; memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); clp->cl_addrlen = cl_init->addrlen; if (cl_init->hostname) { err = -ENOMEM; clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); if (!clp->cl_hostname) goto error_cleanup; } INIT_LIST_HEAD(&clp->cl_superblocks); clp->cl_rpcclient = ERR_PTR(-EINVAL); clp->cl_proto = cl_init->proto; #ifdef CONFIG_NFS_V4 INIT_LIST_HEAD(&clp->cl_delegations); 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_boot_time = CURRENT_TIME; clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; clp->cl_minorversion = cl_init->minorversion; clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; #endif cred = rpc_lookup_machine_cred(); if (!IS_ERR(cred)) clp->cl_machine_cred = cred; nfs_fscache_get_client_cookie(clp); return clp; error_cleanup: kfree(clp); error_0: return ERR_PTR(err); } #ifdef CONFIG_NFS_V4 /* * Clears/puts all minor version specific parts from an nfs_client struct * reverting it to minorversion 0. */ static void nfs4_clear_client_minor_version(struct nfs_client *clp) { #ifdef CONFIG_NFS_V4_1 if (nfs4_has_session(clp)) { nfs4_destroy_session(clp->cl_session); clp->cl_session = NULL; } clp->cl_mvops = nfs_v4_minor_ops[0]; #endif /* CONFIG_NFS_V4_1 */ } /* * 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_clear_client_minor_version(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); } #else static void nfs4_shutdown_client(struct nfs_client *clp) { } #endif /* CONFIG_NFS_V4 */ /* * Destroy a shared client record */ static void nfs_free_client(struct nfs_client *clp) { dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); nfs4_shutdown_client(clp); nfs_fscache_release_client_cookie(clp); /* -EIO all pending I/O */ if (!IS_ERR(clp->cl_rpcclient)) rpc_shutdown_client(clp->cl_rpcclient); if (clp->cl_machine_cred != NULL) put_rpccred(clp->cl_machine_cred); kfree(clp->cl_hostname); kfree(clp); dprintk("<-- nfs_free_client()\n"); } /* * Release a reference to a shared client record */ void nfs_put_client(struct nfs_client *clp) { if (!clp) return; dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { list_del(&clp->cl_share_link); spin_unlock(&nfs_client_lock); BUG_ON(!list_empty(&clp->cl_superblocks)); nfs_free_client(clp); } } #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) /* * Test if two ip6 socket addresses refer to the same socket by * comparing relevant fields. The padding bytes specifically, are not * compared. sin6_flowinfo is not compared because it only affects QoS * and sin6_scope_id is only compared if the address is "link local" * because "link local" addresses need only be unique to a specific * link. Conversely, ordinary unicast addresses might have different * sin6_scope_id. * * The caller should ensure both socket addresses are AF_INET6. */ static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, const struct sockaddr *sa2) { const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && sin1->sin6_scope_id != sin2->sin6_scope_id) return 0; return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); } #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, const struct sockaddr *sa2) { return 0; } #endif /* * Test if two ip4 socket addresses refer to the same socket, by * comparing relevant fields. The padding bytes specifically, are * not compared. * * The caller should ensure both socket addresses are AF_INET. */ static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, const struct sockaddr *sa2) { const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; } static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, const struct sockaddr *sa2) { const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; return nfs_sockaddr_match_ipaddr6(sa1, sa2) && (sin1->sin6_port == sin2->sin6_port); } static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, const struct sockaddr *sa2) { const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; return nfs_sockaddr_match_ipaddr4(sa1, sa2) && (sin1->sin_port == sin2->sin_port); } /* * Test if two socket addresses represent the same actual socket, * by comparing (only) relevant fields, excluding the port number. */ static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, const struct sockaddr *sa2) { if (sa1->sa_family != sa2->sa_family) return 0; switch (sa1->sa_family) { case AF_INET: return nfs_sockaddr_match_ipaddr4(sa1, sa2); case AF_INET6: return nfs_sockaddr_match_ipaddr6(sa1, sa2); } return 0; } /* * Test if two socket addresses represent the same actual socket, * by comparing (only) relevant fields, including the port number. */ static int nfs_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) { if (sa1->sa_family != sa2->sa_family) return 0; switch (sa1->sa_family) { case AF_INET: return nfs_sockaddr_cmp_ip4(sa1, sa2); case AF_INET6: return nfs_sockaddr_cmp_ip6(sa1, sa2); } return 0; } /* * Find a client by IP address and protocol version * - returns NULL if no such client */ struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) { struct nfs_client *clp; spin_lock(&nfs_client_lock); list_for_each_entry(clp, &nfs_client_list, cl_share_link) { struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; /* Don't match clients that failed to initialise properly */ if (!(clp->cl_cons_state == NFS_CS_READY || clp->cl_cons_state == NFS_CS_SESSION_INITING)) continue; /* Different NFS versions cannot share the same nfs_client */ if (clp->rpc_ops->version != nfsversion) continue; /* Match only the IP address, not the port number */ if (!nfs_sockaddr_match_ipaddr(addr, clap)) continue; atomic_inc(&clp->cl_count); spin_unlock(&nfs_client_lock); return clp; } spin_unlock(&nfs_client_lock); return NULL; } /* * Find a client by IP address and protocol version * - returns NULL if no such client */ struct nfs_client *nfs_find_client_next(struct nfs_client *clp) { struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; u32 nfsvers = clp->rpc_ops->version; spin_lock(&nfs_client_lock); list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; /* Don't match clients that failed to initialise properly */ if (clp->cl_cons_state != NFS_CS_READY) continue; /* Different NFS versions cannot share the same nfs_client */ if (clp->rpc_ops->version != nfsvers) continue; /* Match only the IP address, not the port number */ if (!nfs_sockaddr_match_ipaddr(sap, clap)) continue; atomic_inc(&clp->cl_count); spin_unlock(&nfs_client_lock); return clp; } spin_unlock(&nfs_client_lock); return NULL; } /* * Find an nfs_client on the list that matches the initialisation data * that is supplied. */ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) { struct nfs_client *clp; const struct sockaddr *sap = data->addr; list_for_each_entry(clp, &nfs_client_list, cl_share_link) { const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; /* Don't match clients that failed to initialise properly */ if (clp->cl_cons_state < 0) continue; /* Different NFS versions cannot share the same nfs_client */ if (clp->rpc_ops != data->rpc_ops) continue; if (clp->cl_proto != data->proto) continue; /* Match nfsv4 minorversion */ if (clp->cl_minorversion != data->minorversion) continue; /* Match the full socket address */ if (!nfs_sockaddr_cmp(sap, clap)) continue; atomic_inc(&clp->cl_count); return clp; } return NULL; } /* * Look up a client by IP address and protocol version * - creates a new record if one doesn't yet exist */ static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) { struct nfs_client *clp, *new = NULL; int error; dprintk("--> nfs_get_client(%s,v%u)\n", cl_init->hostname ?: "", cl_init->rpc_ops->version); /* see if the client already exists */ do { spin_lock(&nfs_client_lock); clp = nfs_match_client(cl_init); if (clp) goto found_client; if (new) goto install_client; spin_unlock(&nfs_client_lock); new = nfs_alloc_client(cl_init); } while (!IS_ERR(new)); dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); return new; /* install a new client and return with it unready */ install_client: clp = new; list_add(&clp->cl_share_link, &nfs_client_list); spin_unlock(&nfs_client_lock); dprintk("--> nfs_get_client() = %p [new]\n", clp); return clp; /* found an existing client * - make sure it's ready before returning */ found_client: spin_unlock(&nfs_client_lock); if (new) nfs_free_client(new); error = wait_event_killable(nfs_client_active_wq, clp->cl_cons_state < NFS_CS_INITING); if (error < 0) { nfs_put_client(clp); return ERR_PTR(-ERESTARTSYS); } if (clp->cl_cons_state < NFS_CS_READY) { error = clp->cl_cons_state; nfs_put_client(clp); return ERR_PTR(error); } BUG_ON(clp->cl_cons_state != NFS_CS_READY); dprintk("--> nfs_get_client() = %p [share]\n", clp); return clp; } /* * Mark a server as ready or failed */ void nfs_mark_client_ready(struct nfs_client *clp, int state) { clp->cl_cons_state = state; wake_up_all(&nfs_client_active_wq); } /* * With sessions, the client is not marked ready until after a * successful EXCHANGE_ID and CREATE_SESSION. * * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate * other versions of NFS can be tried. */ int nfs4_check_client_ready(struct nfs_client *clp) { if (!nfs4_has_session(clp)) return 0; if (clp->cl_cons_state < NFS_CS_READY) return -EPROTONOSUPPORT; return 0; } /* * Initialise the timeout values for a connection */ static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans) { to->to_initval = timeo * HZ / 10; to->to_retries = retrans; switch (proto) { case XPRT_TRANSPORT_TCP: case XPRT_TRANSPORT_RDMA: if (to->to_retries == 0) to->to_retries = NFS_DEF_TCP_RETRANS; if (to->to_initval == 0) to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; if (to->to_initval > NFS_MAX_TCP_TIMEOUT) to->to_initval = NFS_MAX_TCP_TIMEOUT; to->to_increment = to->to_initval; to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) to->to_maxval = NFS_MAX_TCP_TIMEOUT; if (to->to_maxval < to->to_initval) to->to_maxval = to->to_initval; to->to_exponential = 0; break; case XPRT_TRANSPORT_UDP: if (to->to_retries == 0) to->to_retries = NFS_DEF_UDP_RETRANS; if (!to->to_initval) to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; if (to->to_initval > NFS_MAX_UDP_TIMEOUT) to->to_initval = NFS_MAX_UDP_TIMEOUT; to->to_maxval = NFS_MAX_UDP_TIMEOUT; to->to_exponential = 1; break; default: BUG(); } } /* * Create an RPC client handle */ static int nfs_create_rpc_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, rpc_authflavor_t flavor, int discrtry, int noresvport) { struct rpc_clnt *clnt = NULL; struct rpc_create_args args = { .protocol = clp->cl_proto, .address = (struct sockaddr *)&clp->cl_addr, .addrsize = clp->cl_addrlen, .timeout = timeparms, .servername = clp->cl_hostname, .program = &nfs_program, .version = clp->rpc_ops->version, .authflavor = flavor, }; if (discrtry) args.flags |= RPC_CLNT_CREATE_DISCRTRY; if (noresvport) args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; if (!IS_ERR(clp->cl_rpcclient)) return 0; clnt = rpc_create(&args); if (IS_ERR(clnt)) { dprintk("%s: cannot create RPC client. Error = %ld\n", __func__, PTR_ERR(clnt)); return PTR_ERR(clnt); } clp->cl_rpcclient = clnt; return 0; } /* * Version 2 or 3 client destruction */ static void nfs_destroy_server(struct nfs_server *server) { if (!(server->flags & NFS_MOUNT_NONLM)) nlmclnt_done(server->nlm_host); } /* * Version 2 or 3 lockd setup */ static int nfs_start_lockd(struct nfs_server *server) { struct nlm_host *host; struct nfs_client *clp = server->nfs_client; struct nlmclnt_initdata nlm_init = { .hostname = clp->cl_hostname, .address = (struct sockaddr *)&clp->cl_addr, .addrlen = clp->cl_addrlen, .nfs_version = clp->rpc_ops->version, .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 1 : 0, }; if (nlm_init.nfs_version > 3) return 0; if (server->flags & NFS_MOUNT_NONLM) return 0; switch (clp->cl_proto) { default: nlm_init.protocol = IPPROTO_TCP; break; case XPRT_TRANSPORT_UDP: nlm_init.protocol = IPPROTO_UDP; } host = nlmclnt_init(&nlm_init); if (IS_ERR(host)) return PTR_ERR(host); server->nlm_host = host; server->destroy = nfs_destroy_server; return 0; } /* * Initialise an NFSv3 ACL client connection */ #ifdef CONFIG_NFS_V3_ACL static void nfs_init_server_aclclient(struct nfs_server *server) { if (server->nfs_client->rpc_ops->version != 3) goto out_noacl; if (server->flags & NFS_MOUNT_NOACL) goto out_noacl; server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); if (IS_ERR(server->client_acl)) goto out_noacl; /* No errors! Assume that Sun nfsacls are supported */ server->caps |= NFS_CAP_ACLS; return; out_noacl: server->caps &= ~NFS_CAP_ACLS; } #else static inline void nfs_init_server_aclclient(struct nfs_server *server) { server->flags &= ~NFS_MOUNT_NOACL; server->caps &= ~NFS_CAP_ACLS; } #endif /* * Create a general RPC client */ static int nfs_init_server_rpcclient(struct nfs_server *server, const struct rpc_timeout *timeo, rpc_authflavor_t pseudoflavour) { struct nfs_client *clp = server->nfs_client; server->client = rpc_clone_client(clp->cl_rpcclient); if (IS_ERR(server->client)) { dprintk("%s: couldn't create rpc_client!\n", __func__); return PTR_ERR(server->client); } memcpy(&server->client->cl_timeout_default, timeo, sizeof(server->client->cl_timeout_default)); server->client->cl_timeout = &server->client->cl_timeout_default; if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { struct rpc_auth *auth; auth = rpcauth_create(pseudoflavour, server->client); if (IS_ERR(auth)) { dprintk("%s: couldn't create credcache!\n", __func__); return PTR_ERR(auth); } } server->client->cl_softrtry = 0; if (server->flags & NFS_MOUNT_SOFT) server->client->cl_softrtry = 1; return 0; } /* * Initialise an NFS2 or NFS3 client */ static int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, const struct nfs_parsed_mount_data *data) { int error; if (clp->cl_cons_state == NFS_CS_READY) { /* the client is already initialised */ dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); return 0; } /* * Create a client RPC handle for doing FSSTAT with UNIX auth only * - RFC 2623, sec 2.3.2 */ error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 0, data->flags & NFS_MOUNT_NORESVPORT); if (error < 0) goto error; nfs_mark_client_ready(clp, NFS_CS_READY); return 0; error: nfs_mark_client_ready(clp, error); dprintk("<-- nfs_init_client() = xerror %d\n", error); return error; } /* * Create a version 2 or 3 client */ static int nfs_init_server(struct nfs_server *server, const struct nfs_parsed_mount_data *data) { struct nfs_client_initdata cl_init = { .hostname = data->nfs_server.hostname, .addr = (const struct sockaddr *)&data->nfs_server.address, .addrlen = data->nfs_server.addrlen, .rpc_ops = &nfs_v2_clientops, .proto = data->nfs_server.protocol, }; struct rpc_timeout timeparms; struct nfs_client *clp; int error; dprintk("--> nfs_init_server()\n"); #ifdef CONFIG_NFS_V3 if (data->version == 3) cl_init.rpc_ops = &nfs_v3_clientops; #endif /* Allocate or find a client reference we can use */ clp = nfs_get_client(&cl_init); if (IS_ERR(clp)) { dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); return PTR_ERR(clp); } nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, data->timeo, data->retrans); error = nfs_init_client(clp, &timeparms, data); if (error < 0) goto error; server->nfs_client = clp; /* Initialise the client representation from the mount data */ server->flags = data->flags; server->options = data->options; server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 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; /* Start lockd here, before we might error out */ error = nfs_start_lockd(server); if (error < 0) goto error; server->port = data->nfs_server.port; error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); if (error < 0) goto error; /* Preserve the values of mount_server-related mount options */ if (data->mount_server.addrlen) { memcpy(&server->mountd_address, &data->mount_server.address, data->mount_server.addrlen); server->mountd_addrlen = data->mount_server.addrlen; } server->mountd_version = data->mount_server.version; server->mountd_port = data->mount_server.port; server->mountd_protocol = data->mount_server.protocol; server->namelen = data->namlen; /* Create a client RPC handle for the NFSv3 ACL management interface */ nfs_init_server_aclclient(server); dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); return 0; error: server->nfs_client = NULL; nfs_put_client(clp); dprintk("<-- nfs_init_server() = xerror %d\n", error); return error; } /* * Load up the server record from information gained in an fsinfo record */ static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) { unsigned long max_rpc_payload; /* Work out a lot of parameters */ if (server->rsize == 0) server->rsize = nfs_block_size(fsinfo->rtpref, NULL); if (server->wsize == 0) server->wsize = nfs_block_size(fsinfo->wtpref, NULL); if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) server->rsize = nfs_block_size(fsinfo->rtmax, NULL); if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) server->wsize = nfs_block_size(fsinfo->wtmax, NULL); max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); if (server->rsize > max_rpc_payload) server->rsize = max_rpc_payload; if (server->rsize > NFS_MAX_FILE_IO_SIZE) server->rsize = NFS_MAX_FILE_IO_SIZE; server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; server->backing_dev_info.name = "nfs"; server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; if (server->wsize > max_rpc_payload) server->wsize = max_rpc_payload; if (server->wsize > NFS_MAX_FILE_IO_SIZE) server->wsize = NFS_MAX_FILE_IO_SIZE; server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); if (server->dtsize > PAGE_CACHE_SIZE) server->dtsize = PAGE_CACHE_SIZE; if (server->dtsize > server->rsize) server->dtsize = server->rsize; if (server->flags & NFS_MOUNT_NOAC) { server->acregmin = server->acregmax = 0; server->acdirmin = server->acdirmax = 0; } server->maxfilesize = fsinfo->maxfilesize; /* We're airborne Set socket buffersize */ rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); } /* * Probe filesystem information, including the FSID on v2/v3 */ static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) { struct nfs_fsinfo fsinfo; struct nfs_client *clp = server->nfs_client; int error; dprintk("--> nfs_probe_fsinfo()\n"); if (clp->rpc_ops->set_capabilities != NULL) { error = clp->rpc_ops->set_capabilities(server, mntfh); if (error < 0) goto out_error; } fsinfo.fattr = fattr; error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); if (error < 0) goto out_error; nfs_server_set_fsinfo(server, &fsinfo); /* Get some general file system info */ if (server->namelen == 0) { struct nfs_pathconf pathinfo; pathinfo.fattr = fattr; nfs_fattr_init(fattr); if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) server->namelen = pathinfo.max_namelen; } dprintk("<-- nfs_probe_fsinfo() = 0\n"); return 0; out_error: dprintk("nfs_probe_fsinfo: error = %d\n", -error); return error; } /* * Copy useful information when duplicating a server record */ static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) { target->flags = source->flags; target->rsize = source->rsize; target->wsize = source->wsize; target->acregmin = source->acregmin; target->acregmax = source->acregmax; target->acdirmin = source->acdirmin; target->acdirmax = source->acdirmax; target->caps = source->caps; target->options = source->options; } /* * Allocate and initialise a server record */ static struct nfs_server *nfs_alloc_server(void) { struct nfs_server *server; server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); if (!server) return NULL; server->client = server->client_acl = ERR_PTR(-EINVAL); /* Zero out the NFS state stuff */ INIT_LIST_HEAD(&server->client_link); INIT_LIST_HEAD(&server->master_link); atomic_set(&server->active, 0); server->io_stats = nfs_alloc_iostats(); if (!server->io_stats) { kfree(server); return NULL; } if (bdi_init(&server->backing_dev_info)) { nfs_free_iostats(server->io_stats); kfree(server); return NULL; } return server; } /* * Free up a server record */ void nfs_free_server(struct nfs_server *server) { dprintk("--> nfs_free_server()\n"); spin_lock(&nfs_client_lock); list_del(&server->client_link); list_del(&server->master_link); spin_unlock(&nfs_client_lock); if (server->destroy != NULL) server->destroy(server); if (!IS_ERR(server->client_acl)) rpc_shutdown_client(server->client_acl); if (!IS_ERR(server->client)) rpc_shutdown_client(server->client); nfs_put_client(server->nfs_client); nfs_free_iostats(server->io_stats); bdi_destroy(&server->backing_dev_info); kfree(server); nfs_release_automount_timer(); dprintk("<-- nfs_free_server()\n"); } /* * Create a version 2 or 3 volume record * - keyed on server and FSID */ struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, struct nfs_fh *mntfh) { struct nfs_server *server; struct nfs_fattr *fattr; int error; server = nfs_alloc_server(); if (!server) return ERR_PTR(-ENOMEM); error = -ENOMEM; fattr = nfs_alloc_fattr(); if (fattr == NULL) goto error; /* Get a client representation */ error = nfs_init_server(server, data); if (error < 0) goto error; BUG_ON(!server->nfs_client); BUG_ON(!server->nfs_client->rpc_ops); BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); /* Probe the root fh to retrieve its FSID */ error = nfs_probe_fsinfo(server, mntfh, fattr); if (error < 0) goto error; if (server->nfs_client->rpc_ops->version == 3) { if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) server->namelen = NFS3_MAXNAMLEN; if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) server->caps |= NFS_CAP_READDIRPLUS; } else { if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) server->namelen = NFS2_MAXNAMLEN; } if (!(fattr->valid & NFS_ATTR_FATTR)) { error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); if (error < 0) { dprintk("nfs_create_server: getattr error = %d\n", -error); goto error; } } memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); dprintk("Server FSID: %llx:%llx\n", (unsigned long long) server->fsid.major, (unsigned long long) server->fsid.minor); spin_lock(&nfs_client_lock); list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); list_add_tail(&server->master_link, &nfs_volume_list); spin_unlock(&nfs_client_lock); server->mount_time = jiffies; nfs_free_fattr(fattr); return server; error: nfs_free_fattr(fattr); nfs_free_server(server); return ERR_PTR(error); } #ifdef CONFIG_NFS_V4 /* * Initialize the NFS4 callback service */ static int nfs4_init_callback(struct nfs_client *clp) { int error; if (clp->rpc_ops->version == 4) { if (nfs4_has_session(clp)) { error = xprt_setup_backchannel( clp->cl_rpcclient->cl_xprt, NFS41_BC_MIN_CALLBACKS); if (error < 0) return error; } error = nfs_callback_up(clp->cl_mvops->minor_version, clp->cl_rpcclient->cl_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 */ clp->cl_cons_state = NFS_CS_SESSION_INITING; } #endif /* CONFIG_NFS_V4_1 */ return nfs4_init_callback(clp); } /* * Initialise an NFS4 client record */ static int nfs4_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, const char *ip_addr, rpc_authflavor_t authflavour, int flags) { 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 0; } /* Check NFS protocol revision and initialize RPC op vector */ clp->rpc_ops = &nfs_v4_clientops; error = nfs_create_rpc_client(clp, timeparms, authflavour, 1, flags & NFS_MOUNT_NORESVPORT); if (error < 0) goto error; 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 0; error: nfs_mark_client_ready(clp, error); dprintk("<-- nfs4_init_client() = xerror %d\n", error); return error; } /* * 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 nfs_client_initdata cl_init = { .hostname = hostname, .addr = addr, .addrlen = addrlen, .rpc_ops = &nfs_v4_clientops, .proto = proto, .minorversion = minorversion, }; struct nfs_client *clp; int error; dprintk("--> nfs4_set_client()\n"); /* Allocate or find a client reference we can use */ clp = nfs_get_client(&cl_init); if (IS_ERR(clp)) { error = PTR_ERR(clp); goto error; } error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, server->flags); if (error < 0) goto error_put; server->nfs_client = clp; dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); return 0; error_put: nfs_put_client(clp); error: dprintk("<-- nfs4_set_client() = xerror %d\n", error); return error; } /* * 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); 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; spin_lock(&nfs_client_lock); list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); list_add_tail(&server->master_link, &nfs_volume_list); spin_unlock(&nfs_client_lock); server->mount_time = jiffies; 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; 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); 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->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, parent_server->client->cl_xprt->prot, parent_server->client->cl_timeout, parent_client->cl_mvops->minor_version); 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); } #endif /* CONFIG_NFS_V4 */ /* * Clone an NFS2, NFS3 or NFS4 server record */ struct nfs_server *nfs_clone_server(struct nfs_server *source, struct nfs_fh *fh, struct nfs_fattr *fattr) { struct nfs_server *server; struct nfs_fattr *fattr_fsinfo; int error; dprintk("--> nfs_clone_server(,%llx:%llx,)\n", (unsigned long long) fattr->fsid.major, (unsigned long long) fattr->fsid.minor); server = nfs_alloc_server(); if (!server) return ERR_PTR(-ENOMEM); error = -ENOMEM; fattr_fsinfo = nfs_alloc_fattr(); if (fattr_fsinfo == NULL) goto out_free_server; /* Copy data from the source */ server->nfs_client = source->nfs_client; atomic_inc(&server->nfs_client->cl_count); nfs_server_copy_userdata(server, source); server->fsid = fattr->fsid; error = nfs_init_server_rpcclient(server, source->client->cl_timeout, source->client->cl_auth->au_flavor); if (error < 0) goto out_free_server; if (!IS_ERR(source->client_acl)) nfs_init_server_aclclient(server); /* probe the filesystem info for this server filesystem */ error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); if (error < 0) goto out_free_server; if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) server->namelen = NFS4_MAXNAMLEN; dprintk("Cloned FSID: %llx:%llx\n", (unsigned long long) server->fsid.major, (unsigned long long) server->fsid.minor); error = nfs_start_lockd(server); if (error < 0) goto out_free_server; spin_lock(&nfs_client_lock); list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); list_add_tail(&server->master_link, &nfs_volume_list); spin_unlock(&nfs_client_lock); server->mount_time = jiffies; nfs_free_fattr(fattr_fsinfo); dprintk("<-- nfs_clone_server() = %p\n", server); return server; out_free_server: nfs_free_fattr(fattr_fsinfo); nfs_free_server(server); dprintk("<-- nfs_clone_server() = error %d\n", error); return ERR_PTR(error); } #ifdef CONFIG_PROC_FS static struct proc_dir_entry *proc_fs_nfs; static int nfs_server_list_open(struct inode *inode, struct file *file); static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); static void nfs_server_list_stop(struct seq_file *p, void *v); static int nfs_server_list_show(struct seq_file *m, void *v); static const struct seq_operations nfs_server_list_ops = { .start = nfs_server_list_start, .next = nfs_server_list_next, .stop = nfs_server_list_stop, .show = nfs_server_list_show, }; static const struct file_operations nfs_server_list_fops = { .open = nfs_server_list_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, .owner = THIS_MODULE, }; static int nfs_volume_list_open(struct inode *inode, struct file *file); static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); static void nfs_volume_list_stop(struct seq_file *p, void *v); static int nfs_volume_list_show(struct seq_file *m, void *v); static const struct seq_operations nfs_volume_list_ops = { .start = nfs_volume_list_start, .next = nfs_volume_list_next, .stop = nfs_volume_list_stop, .show = nfs_volume_list_show, }; static const struct file_operations nfs_volume_list_fops = { .open = nfs_volume_list_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, .owner = THIS_MODULE, }; /* * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which * we're dealing */ static int nfs_server_list_open(struct inode *inode, struct file *file) { struct seq_file *m; int ret; ret = seq_open(file, &nfs_server_list_ops); if (ret < 0) return ret; m = file->private_data; m->private = PDE(inode)->data; return 0; } /* * set up the iterator to start reading from the server list and return the first item */ static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) { /* lock the list against modification */ spin_lock(&nfs_client_lock); return seq_list_start_head(&nfs_client_list, *_pos); } /* * move to next server */ static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) { return seq_list_next(v, &nfs_client_list, pos); } /* * clean up after reading from the transports list */ static void nfs_server_list_stop(struct seq_file *p, void *v) { spin_unlock(&nfs_client_lock); } /* * display a header line followed by a load of call lines */ static int nfs_server_list_show(struct seq_file *m, void *v) { struct nfs_client *clp; /* display header on line 1 */ if (v == &nfs_client_list) { seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); return 0; } /* display one transport per line on subsequent lines */ clp = list_entry(v, struct nfs_client, cl_share_link); seq_printf(m, "v%u %s %s %3d %s\n", clp->rpc_ops->version, rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), atomic_read(&clp->cl_count), clp->cl_hostname); return 0; } /* * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes */ static int nfs_volume_list_open(struct inode *inode, struct file *file) { struct seq_file *m; int ret; ret = seq_open(file, &nfs_volume_list_ops); if (ret < 0) return ret; m = file->private_data; m->private = PDE(inode)->data; return 0; } /* * set up the iterator to start reading from the volume list and return the first item */ static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) { /* lock the list against modification */ spin_lock(&nfs_client_lock); return seq_list_start_head(&nfs_volume_list, *_pos); } /* * move to next volume */ static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) { return seq_list_next(v, &nfs_volume_list, pos); } /* * clean up after reading from the transports list */ static void nfs_volume_list_stop(struct seq_file *p, void *v) { spin_unlock(&nfs_client_lock); } /* * display a header line followed by a load of call lines */ static int nfs_volume_list_show(struct seq_file *m, void *v) { struct nfs_server *server; struct nfs_client *clp; char dev[8], fsid[17]; /* display header on line 1 */ if (v == &nfs_volume_list) { seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); return 0; } /* display one transport per line on subsequent lines */ server = list_entry(v, struct nfs_server, master_link); clp = server->nfs_client; snprintf(dev, 8, "%u:%u", MAJOR(server->s_dev), MINOR(server->s_dev)); snprintf(fsid, 17, "%llx:%llx", (unsigned long long) server->fsid.major, (unsigned long long) server->fsid.minor); seq_printf(m, "v%u %s %s %-7s %-17s %s\n", clp->rpc_ops->version, rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), dev, fsid, nfs_server_fscache_state(server)); return 0; } /* * initialise the /proc/fs/nfsfs/ directory */ int __init nfs_fs_proc_init(void) { struct proc_dir_entry *p; proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); if (!proc_fs_nfs) goto error_0; /* a file of servers with which we're dealing */ p = proc_create("servers", S_IFREG|S_IRUGO, proc_fs_nfs, &nfs_server_list_fops); if (!p) goto error_1; /* a file of volumes that we have mounted */ p = proc_create("volumes", S_IFREG|S_IRUGO, proc_fs_nfs, &nfs_volume_list_fops); if (!p) goto error_2; return 0; error_2: remove_proc_entry("servers", proc_fs_nfs); error_1: remove_proc_entry("fs/nfsfs", NULL); error_0: return -ENOMEM; } /* * clean up the /proc/fs/nfsfs/ directory */ void nfs_fs_proc_exit(void) { remove_proc_entry("volumes", proc_fs_nfs); remove_proc_entry("servers", proc_fs_nfs); remove_proc_entry("fs/nfsfs", NULL); } #endif /* CONFIG_PROC_FS */