/* 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/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/nfs_fs.h> #include <linux/nfs_mount.h> #include <linux/nfs4_mount.h> #include <linux/lockd/bind.h> #include <linux/smp_lock.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/nfs_xdr.h> #include <asm/system.h> #include "nfs4_fs.h" #include "callback.h" #include "delegation.h" #include "iostat.h" #include "internal.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 */ /* * 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 char *hostname, const struct sockaddr_in *addr, int nfsversion) { struct nfs_client *clp; int error; if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) goto error_0; error = rpciod_up(); if (error < 0) { dprintk("%s: couldn't start rpciod! Error = %d\n", __FUNCTION__, error); goto error_1; } __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state); if (nfsversion == 4) { if (nfs_callback_up() < 0) goto error_2; __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); } atomic_set(&clp->cl_count, 1); clp->cl_cons_state = NFS_CS_INITING; clp->cl_nfsversion = nfsversion; memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); if (hostname) { clp->cl_hostname = kstrdup(hostname, GFP_KERNEL); if (!clp->cl_hostname) goto error_3; } INIT_LIST_HEAD(&clp->cl_superblocks); clp->cl_rpcclient = ERR_PTR(-EINVAL); #ifdef CONFIG_NFS_V4 init_rwsem(&clp->cl_sem); INIT_LIST_HEAD(&clp->cl_delegations); INIT_LIST_HEAD(&clp->cl_state_owners); INIT_LIST_HEAD(&clp->cl_unused); 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; #endif return clp; error_3: if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) nfs_callback_down(); error_2: rpciod_down(); __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state); error_1: kfree(clp); error_0: return NULL; } static void nfs4_shutdown_client(struct nfs_client *clp) { #ifdef CONFIG_NFS_V4 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) nfs4_kill_renewd(clp); while (!list_empty(&clp->cl_unused)) { struct nfs4_state_owner *sp; sp = list_entry(clp->cl_unused.next, struct nfs4_state_owner, so_list); list_del(&sp->so_list); kfree(sp); } BUG_ON(!list_empty(&clp->cl_state_owners)); if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) nfs_idmap_delete(clp); #endif } /* * Destroy a shared client record */ static void nfs_free_client(struct nfs_client *clp) { dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion); nfs4_shutdown_client(clp); /* -EIO all pending I/O */ if (!IS_ERR(clp->cl_rpcclient)) rpc_shutdown_client(clp->cl_rpcclient); if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) nfs_callback_down(); if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state)) rpciod_down(); 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); } } /* * Find a client by address * - caller must hold nfs_client_lock */ static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port) { struct nfs_client *clp; list_for_each_entry(clp, &nfs_client_list, cl_share_link) { /* 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->cl_nfsversion != nfsversion) continue; if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr, sizeof(clp->cl_addr.sin_addr)) != 0) continue; if (!match_port || clp->cl_addr.sin_port == addr->sin_port) goto found; } return NULL; found: atomic_inc(&clp->cl_count); return clp; } /* * Find a client by IP address and protocol version * - returns NULL if no such client */ struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion) { struct nfs_client *clp; spin_lock(&nfs_client_lock); clp = __nfs_find_client(addr, nfsversion, 0); spin_unlock(&nfs_client_lock); if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) { nfs_put_client(clp); clp = NULL; } return clp; } /* * 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 char *hostname, const struct sockaddr_in *addr, int nfsversion) { struct nfs_client *clp, *new = NULL; int error; dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n", hostname ?: "", NIPQUAD(addr->sin_addr), addr->sin_port, nfsversion); /* see if the client already exists */ do { spin_lock(&nfs_client_lock); clp = __nfs_find_client(addr, nfsversion, 1); if (clp) goto found_client; if (new) goto install_client; spin_unlock(&nfs_client_lock); new = nfs_alloc_client(hostname, addr, nfsversion); } while (new); return ERR_PTR(-ENOMEM); /* 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_interruptible(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 */ static void nfs_mark_client_ready(struct nfs_client *clp, int state) { clp->cl_cons_state = state; wake_up_all(&nfs_client_active_wq); } /* * 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; if (!to->to_retries) to->to_retries = 2; switch (proto) { case IPPROTO_TCP: if (!to->to_initval) to->to_initval = 60 * HZ; 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); to->to_exponential = 0; break; case IPPROTO_UDP: default: if (!to->to_initval) to->to_initval = 11 * 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; } } /* * Create an RPC client handle */ static int nfs_create_rpc_client(struct nfs_client *clp, int proto, unsigned int timeo, unsigned int retrans, rpc_authflavor_t flavor) { struct rpc_timeout timeparms; struct rpc_clnt *clnt = NULL; struct rpc_create_args args = { .protocol = proto, .address = (struct sockaddr *)&clp->cl_addr, .addrsize = sizeof(clp->cl_addr), .timeout = &timeparms, .servername = clp->cl_hostname, .program = &nfs_program, .version = clp->rpc_ops->version, .authflavor = flavor, }; if (!IS_ERR(clp->cl_rpcclient)) return 0; nfs_init_timeout_values(&timeparms, proto, timeo, retrans); clp->retrans_timeo = timeparms.to_initval; clp->retrans_count = timeparms.to_retries; clnt = rpc_create(&args); if (IS_ERR(clnt)) { dprintk("%s: cannot create RPC client. Error = %ld\n", __FUNCTION__, 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 (!IS_ERR(server->client_acl)) rpc_shutdown_client(server->client_acl); if (!(server->flags & NFS_MOUNT_NONLM)) lockd_down(); /* release rpc.lockd */ } /* * Version 2 or 3 lockd setup */ static int nfs_start_lockd(struct nfs_server *server) { int error = 0; if (server->nfs_client->cl_nfsversion > 3) goto out; if (server->flags & NFS_MOUNT_NONLM) goto out; error = lockd_up((server->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP); if (error < 0) server->flags |= NFS_MOUNT_NONLM; else server->destroy = nfs_destroy_server; out: return error; } /* * 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->cl_nfsversion != 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, 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", __FUNCTION__); return PTR_ERR(server->client); } 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", __FUNCTION__); return PTR_ERR(auth); } } server->client->cl_softrtry = 0; if (server->flags & NFS_MOUNT_SOFT) server->client->cl_softrtry = 1; server->client->cl_intr = 0; if (server->flags & NFS4_MOUNT_INTR) server->client->cl_intr = 1; return 0; } /* * Initialise an NFS2 or NFS3 client */ static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data) { int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; 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; } /* Check NFS protocol revision and initialize RPC op vector */ clp->rpc_ops = &nfs_v2_clientops; #ifdef CONFIG_NFS_V3 if (clp->cl_nfsversion == 3) clp->rpc_ops = &nfs_v3_clientops; #endif /* * Create a client RPC handle for doing FSSTAT with UNIX auth only * - RFC 2623, sec 2.3.2 */ error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans, RPC_AUTH_UNIX); 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_mount_data *data) { struct nfs_client *clp; int error, nfsvers = 2; dprintk("--> nfs_init_server()\n"); #ifdef CONFIG_NFS_V3 if (data->flags & NFS_MOUNT_VER3) nfsvers = 3; #endif /* Allocate or find a client reference we can use */ clp = nfs_get_client(data->hostname, &data->addr, nfsvers); if (IS_ERR(clp)) { dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); return PTR_ERR(clp); } error = nfs_init_client(clp, data); if (error < 0) goto error; server->nfs_client = clp; /* Initialise the client representation from the mount data */ server->flags = data->flags & NFS_MOUNT_FLAGMASK; 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; error = nfs_init_server_rpcclient(server, data->pseudoflavor); if (error < 0) goto error; server->namelen = data->namlen; /* Create a client RPC handle for the NFSv3 ACL management interface */ nfs_init_server_aclclient(server); if (clp->cl_nfsversion == 3) { if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) server->namelen = NFS3_MAXNAMLEN; server->caps |= NFS_CAP_READDIRPLUS; } else { if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) server->namelen = NFS2_MAXNAMLEN; } 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.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; nfs_fattr_init(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->acregmin = source->acregmin; target->acregmax = source->acregmax; target->acdirmin = source->acdirmin; target->acdirmax = source->acdirmax; target->caps = source->caps; } /* * 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); server->io_stats = nfs_alloc_iostats(); if (!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)) rpc_shutdown_client(server->client); nfs_put_client(server->nfs_client); nfs_free_iostats(server->io_stats); 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_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); /* 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 (!(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); BUG_ON(!server->nfs_client); BUG_ON(!server->nfs_client->rpc_ops); BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 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; return server; error: nfs_free_server(server); return ERR_PTR(error); } #ifdef CONFIG_NFS_V4 /* * Initialise an NFS4 client record */ static int nfs4_init_client(struct nfs_client *clp, int proto, int timeo, int retrans, const char *ip_addr, rpc_authflavor_t authflavour) { 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, proto, timeo, retrans, authflavour); if (error < 0) goto error; memcpy(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", __FUNCTION__, error); goto error; } __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 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_in *addr, const char *ip_addr, rpc_authflavor_t authflavour, int proto, int timeo, int retrans) { struct nfs_client *clp; int error; dprintk("--> nfs4_set_client()\n"); /* Allocate or find a client reference we can use */ clp = nfs_get_client(hostname, addr, 4); if (IS_ERR(clp)) { error = PTR_ERR(clp); goto error; } error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour); 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; } /* * Create a version 4 volume record */ static int nfs4_init_server(struct nfs_server *server, const struct nfs4_mount_data *data, rpc_authflavor_t authflavour) { int error; dprintk("--> nfs4_init_server()\n"); /* Initialise the client representation from the mount data */ server->flags = data->flags & NFS_MOUNT_FLAGMASK; server->caps |= NFS_CAP_ATOMIC_OPEN; 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; error = nfs_init_server_rpcclient(server, authflavour); /* 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 nfs4_mount_data *data, const char *hostname, const struct sockaddr_in *addr, const char *mntpath, const char *ip_addr, rpc_authflavor_t authflavour, struct nfs_fh *mntfh) { struct nfs_fattr fattr; struct nfs_server *server; int error; dprintk("--> nfs4_create_server()\n"); server = nfs_alloc_server(); if (!server) return ERR_PTR(-ENOMEM); /* Get a client record */ error = nfs4_set_client(server, hostname, addr, ip_addr, authflavour, data->proto, data->timeo, data->retrans); if (error < 0) goto error; /* set up the general RPC client */ error = nfs4_init_server(server, data, authflavour); 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 = nfs4_path_walk(server, mntfh, mntpath); if (error < 0) goto 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); error = nfs_probe_fsinfo(server, mntfh, &fattr); 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); 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; 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 *fh) { struct nfs_client *parent_client; struct nfs_server *server, *parent_server; struct nfs_fattr fattr; 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; /* Get a client representation. * Note: NFSv4 always uses TCP, */ error = nfs4_set_client(server, data->hostname, data->addr, parent_client->cl_ipaddr, data->authflavor, parent_server->client->cl_xprt->prot, parent_client->retrans_timeo, parent_client->retrans_count); if (error < 0) goto error; /* Initialise the client representation from the parent server */ nfs_server_copy_userdata(server, parent_server); server->caps |= NFS_CAP_ATOMIC_OPEN; error = nfs_init_server_rpcclient(server, data->authflavor); 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 filesystem info for this server filesystem */ error = nfs_probe_fsinfo(server, fh, &fattr); if (error < 0) goto error; dprintk("Referral 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; 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); /* 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_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; 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; dprintk("<-- nfs_clone_server() = %p\n", server); return server; out_free_server: 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 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 struct file_operations nfs_server_list_fops = { .open = nfs_server_list_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; 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 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 struct file_operations nfs_volume_list_fops = { .open = nfs_volume_list_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; /* * 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) { struct list_head *_p; loff_t pos = *_pos; /* lock the list against modification */ spin_lock(&nfs_client_lock); /* allow for the header line */ if (!pos) return SEQ_START_TOKEN; pos--; /* find the n'th element in the list */ list_for_each(_p, &nfs_client_list) if (!pos--) break; return _p != &nfs_client_list ? _p : NULL; } /* * move to next server */ static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) { struct list_head *_p; (*pos)++; _p = v; _p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next; return _p != &nfs_client_list ? _p : NULL; } /* * 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 == SEQ_START_TOKEN) { 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%d %02x%02x%02x%02x %4hx %3d %s\n", clp->cl_nfsversion, NIPQUAD(clp->cl_addr.sin_addr), ntohs(clp->cl_addr.sin_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) { struct list_head *_p; loff_t pos = *_pos; /* lock the list against modification */ spin_lock(&nfs_client_lock); /* allow for the header line */ if (!pos) return SEQ_START_TOKEN; pos--; /* find the n'th element in the list */ list_for_each(_p, &nfs_volume_list) if (!pos--) break; return _p != &nfs_volume_list ? _p : NULL; } /* * move to next volume */ static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) { struct list_head *_p; (*pos)++; _p = v; _p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next; return _p != &nfs_volume_list ? _p : NULL; } /* * 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 == SEQ_START_TOKEN) { seq_puts(m, "NV SERVER PORT DEV FSID\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%d %02x%02x%02x%02x %4hx %-7s %-17s\n", clp->cl_nfsversion, NIPQUAD(clp->cl_addr.sin_addr), ntohs(clp->cl_addr.sin_port), dev, fsid); 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("nfsfs", proc_root_fs); if (!proc_fs_nfs) goto error_0; proc_fs_nfs->owner = THIS_MODULE; /* a file of servers with which we're dealing */ p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs); if (!p) goto error_1; p->proc_fops = &nfs_server_list_fops; p->owner = THIS_MODULE; /* a file of volumes that we have mounted */ p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs); if (!p) goto error_2; p->proc_fops = &nfs_volume_list_fops; p->owner = THIS_MODULE; return 0; error_2: remove_proc_entry("servers", proc_fs_nfs); error_1: remove_proc_entry("nfsfs", proc_root_fs); 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("nfsfs", proc_root_fs); } #endif /* CONFIG_PROC_FS */