| /* 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 <linux/idr.h> |
| #include <net/ipv6.h> |
| #include <linux/nfs_xdr.h> |
| #include <linux/sunrpc/bc_xprt.h> |
| #include <linux/nsproxy.h> |
| #include <linux/pid_namespace.h> |
| |
| |
| #include "nfs4_fs.h" |
| #include "callback.h" |
| #include "delegation.h" |
| #include "iostat.h" |
| #include "internal.h" |
| #include "fscache.h" |
| #include "pnfs.h" |
| #include "nfs.h" |
| #include "netns.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_CLIENT |
| |
| static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); |
| static DEFINE_SPINLOCK(nfs_version_lock); |
| static DEFINE_MUTEX(nfs_version_mutex); |
| static LIST_HEAD(nfs_versions); |
| |
| /* |
| * RPC cruft for NFS |
| */ |
| static const struct rpc_version *nfs_version[5] = { |
| [2] = NULL, |
| [3] = NULL, |
| [4] = NULL, |
| }; |
| |
| const 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_PIPE_DIRNAME, |
| }; |
| |
| struct rpc_stat nfs_rpcstat = { |
| .program = &nfs_program |
| }; |
| |
| |
| #ifdef CONFIG_NFS_V3_ACL |
| static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; |
| static const struct rpc_version *nfsacl_version[] = { |
| [3] = &nfsacl_version3, |
| }; |
| |
| const 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 */ |
| |
| static struct nfs_subversion *find_nfs_version(unsigned int version) |
| { |
| struct nfs_subversion *nfs; |
| spin_lock(&nfs_version_lock); |
| |
| list_for_each_entry(nfs, &nfs_versions, list) { |
| if (nfs->rpc_ops->version == version) { |
| spin_unlock(&nfs_version_lock); |
| return nfs; |
| } |
| }; |
| |
| spin_unlock(&nfs_version_lock); |
| return ERR_PTR(-EPROTONOSUPPORT);; |
| } |
| |
| struct nfs_subversion *get_nfs_version(unsigned int version) |
| { |
| struct nfs_subversion *nfs = find_nfs_version(version); |
| |
| if (IS_ERR(nfs)) { |
| mutex_lock(&nfs_version_mutex); |
| request_module("nfs%d", version); |
| nfs = find_nfs_version(version); |
| mutex_unlock(&nfs_version_mutex); |
| } |
| |
| if (!IS_ERR(nfs)) |
| try_module_get(nfs->owner); |
| return nfs; |
| } |
| |
| void put_nfs_version(struct nfs_subversion *nfs) |
| { |
| module_put(nfs->owner); |
| } |
| |
| void register_nfs_version(struct nfs_subversion *nfs) |
| { |
| spin_lock(&nfs_version_lock); |
| |
| list_add(&nfs->list, &nfs_versions); |
| nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; |
| |
| spin_unlock(&nfs_version_lock); |
| } |
| EXPORT_SYMBOL_GPL(register_nfs_version); |
| |
| void unregister_nfs_version(struct nfs_subversion *nfs) |
| { |
| spin_lock(&nfs_version_lock); |
| |
| nfs_version[nfs->rpc_ops->version] = NULL; |
| list_del(&nfs->list); |
| |
| spin_unlock(&nfs_version_lock); |
| } |
| EXPORT_SYMBOL_GPL(unregister_nfs_version); |
| |
| /* |
| * Preload all configured NFS versions during module init. |
| * This function should be edited after each protocol is converted, |
| * and eventually removed. |
| */ |
| int __init nfs_register_versions(void) |
| { |
| int err = init_nfs_v2(); |
| if (err) |
| return err; |
| |
| err = init_nfs_v3(); |
| if (err) |
| return err; |
| |
| return init_nfs_v4(); |
| } |
| |
| /* |
| * Remove each pre-loaded NFS version |
| */ |
| void nfs_unregister_versions(void) |
| { |
| exit_nfs_v2(); |
| exit_nfs_v3(); |
| exit_nfs_v4(); |
| } |
| |
| /* |
| * Allocate a shared client record |
| * |
| * Since these are allocated/deallocated very rarely, we don't |
| * bother putting them in a slab cache... |
| */ |
| 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->cl_nfs_mod = cl_init->nfs_mod; |
| try_module_get(clp->cl_nfs_mod->owner); |
| |
| clp->rpc_ops = clp->cl_nfs_mod->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; |
| clp->cl_net = get_net(cl_init->net); |
| |
| cred = rpc_lookup_machine_cred("*"); |
| if (!IS_ERR(cred)) |
| clp->cl_machine_cred = cred; |
| nfs_fscache_get_client_cookie(clp); |
| |
| return clp; |
| |
| error_cleanup: |
| put_nfs_version(clp->cl_nfs_mod); |
| kfree(clp); |
| error_0: |
| return ERR_PTR(err); |
| } |
| |
| #ifdef CONFIG_NFS_V4 |
| /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ |
| void nfs_cleanup_cb_ident_idr(struct net *net) |
| { |
| struct nfs_net *nn = net_generic(net, nfs_net_id); |
| |
| idr_destroy(&nn->cb_ident_idr); |
| } |
| |
| /* nfs_client_lock held */ |
| static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
| { |
| struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
| |
| if (clp->cl_cb_ident) |
| idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); |
| } |
| |
| static void pnfs_init_server(struct nfs_server *server) |
| { |
| rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); |
| } |
| |
| #else |
| void nfs_cleanup_cb_ident_idr(struct net *net) |
| { |
| } |
| |
| static void nfs_cb_idr_remove_locked(struct nfs_client *clp) |
| { |
| } |
| |
| static void pnfs_init_server(struct nfs_server *server) |
| { |
| } |
| |
| #endif /* CONFIG_NFS_V4 */ |
| |
| /* |
| * Destroy a shared client record |
| */ |
| void nfs_free_client(struct nfs_client *clp) |
| { |
| dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); |
| |
| 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); |
| |
| put_net(clp->cl_net); |
| put_nfs_version(clp->cl_nfs_mod); |
| 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) |
| { |
| struct nfs_net *nn; |
| |
| if (!clp) |
| return; |
| |
| dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); |
| nn = net_generic(clp->cl_net, nfs_net_id); |
| |
| if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { |
| list_del(&clp->cl_share_link); |
| nfs_cb_idr_remove_locked(clp); |
| spin_unlock(&nn->nfs_client_lock); |
| |
| BUG_ON(!list_empty(&clp->cl_superblocks)); |
| |
| clp->rpc_ops->free_client(clp); |
| } |
| } |
| EXPORT_SYMBOL_GPL(nfs_put_client); |
| |
| #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_equal(&sin1->sin6_addr, &sin2->sin6_addr)) |
| return 0; |
| else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| return sin1->sin6_scope_id == sin2->sin6_scope_id; |
| |
| return 1; |
| } |
| #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); |
| } |
| |
| #if defined(CONFIG_NFS_V4_1) |
| /* |
| * Test if two socket addresses represent the same actual socket, |
| * by comparing (only) relevant fields, excluding the port number. |
| */ |
| 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; |
| } |
| #endif /* CONFIG_NFS_V4_1 */ |
| |
| /* |
| * 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 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; |
| struct nfs_net *nn = net_generic(data->net, nfs_net_id); |
| |
| list_for_each_entry(clp, &nn->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->nfs_mod->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; |
| } |
| |
| static bool nfs_client_init_is_complete(const struct nfs_client *clp) |
| { |
| return clp->cl_cons_state != NFS_CS_INITING; |
| } |
| |
| int nfs_wait_client_init_complete(const struct nfs_client *clp) |
| { |
| return wait_event_killable(nfs_client_active_wq, |
| nfs_client_init_is_complete(clp)); |
| } |
| |
| /* |
| * Found an existing client. Make sure it's ready before returning. |
| */ |
| static struct nfs_client * |
| nfs_found_client(const struct nfs_client_initdata *cl_init, |
| struct nfs_client *clp) |
| { |
| int error; |
| |
| error = nfs_wait_client_init_complete(clp); |
| 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); |
| } |
| |
| smp_rmb(); |
| |
| dprintk("<-- %s found nfs_client %p for %s\n", |
| __func__, clp, cl_init->hostname ?: ""); |
| return clp; |
| } |
| |
| /* |
| * Look up a client by IP address and protocol version |
| * - creates a new record if one doesn't yet exist |
| */ |
| struct nfs_client * |
| nfs_get_client(const struct nfs_client_initdata *cl_init, |
| const struct rpc_timeout *timeparms, |
| const char *ip_addr, |
| rpc_authflavor_t authflavour) |
| { |
| struct nfs_client *clp, *new = NULL; |
| struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); |
| const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; |
| |
| dprintk("--> nfs_get_client(%s,v%u)\n", |
| cl_init->hostname ?: "", rpc_ops->version); |
| |
| /* see if the client already exists */ |
| do { |
| spin_lock(&nn->nfs_client_lock); |
| |
| clp = nfs_match_client(cl_init); |
| if (clp) { |
| spin_unlock(&nn->nfs_client_lock); |
| if (new) |
| new->rpc_ops->free_client(new); |
| return nfs_found_client(cl_init, clp); |
| } |
| if (new) { |
| list_add(&new->cl_share_link, &nn->nfs_client_list); |
| spin_unlock(&nn->nfs_client_lock); |
| new->cl_flags = cl_init->init_flags; |
| return rpc_ops->init_client(new, timeparms, ip_addr, |
| authflavour); |
| } |
| |
| spin_unlock(&nn->nfs_client_lock); |
| |
| new = rpc_ops->alloc_client(cl_init); |
| } while (!IS_ERR(new)); |
| |
| dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", |
| cl_init->hostname ?: "", PTR_ERR(new)); |
| return new; |
| } |
| |
| /* |
| * Mark a server as ready or failed |
| */ |
| void nfs_mark_client_ready(struct nfs_client *clp, int state) |
| { |
| smp_wmb(); |
| clp->cl_cons_state = state; |
| wake_up_all(&nfs_client_active_wq); |
| } |
| |
| /* |
| * Initialise the timeout values for a connection |
| */ |
| 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 |
| */ |
| int nfs_create_rpc_client(struct nfs_client *clp, |
| const struct rpc_timeout *timeparms, |
| rpc_authflavor_t flavor) |
| { |
| struct rpc_clnt *clnt = NULL; |
| struct rpc_create_args args = { |
| .net = clp->cl_net, |
| .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 (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) |
| args.flags |= RPC_CLNT_CREATE_DISCRTRY; |
| if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) |
| 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_LOCAL_FLOCK) || |
| !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) |
| 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, |
| .net = clp->cl_net, |
| }; |
| |
| if (nlm_init.nfs_version > 3) |
| return 0; |
| if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && |
| (server->flags & NFS_MOUNT_LOCAL_FCNTL)) |
| 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 |
| */ |
| 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; |
| } |
| |
| /** |
| * nfs_init_client - Initialise an NFS2 or NFS3 client |
| * |
| * @clp: nfs_client to initialise |
| * @timeparms: timeout parameters for underlying RPC transport |
| * @ip_addr: IP presentation address (not used) |
| * @authflavor: authentication flavor for underlying RPC transport |
| * |
| * Returns pointer to an NFS client, or an ERR_PTR value. |
| */ |
| struct nfs_client *nfs_init_client(struct nfs_client *clp, |
| const struct rpc_timeout *timeparms, |
| const char *ip_addr, rpc_authflavor_t authflavour) |
| { |
| 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 clp; |
| } |
| |
| /* |
| * 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); |
| if (error < 0) |
| goto error; |
| nfs_mark_client_ready(clp, NFS_CS_READY); |
| return clp; |
| |
| error: |
| nfs_mark_client_ready(clp, error); |
| nfs_put_client(clp); |
| dprintk("<-- nfs_init_client() = xerror %d\n", error); |
| return ERR_PTR(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_subversion *nfs_mod) |
| { |
| struct nfs_client_initdata cl_init = { |
| .hostname = data->nfs_server.hostname, |
| .addr = (const struct sockaddr *)&data->nfs_server.address, |
| .addrlen = data->nfs_server.addrlen, |
| .nfs_mod = nfs_mod, |
| .proto = data->nfs_server.protocol, |
| .net = data->net, |
| }; |
| struct rpc_timeout timeparms; |
| struct nfs_client *clp; |
| int error; |
| |
| dprintk("--> nfs_init_server()\n"); |
| |
| nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, |
| data->timeo, data->retrans); |
| if (data->flags & NFS_MOUNT_NORESVPORT) |
| set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); |
| |
| /* Allocate or find a client reference we can use */ |
| clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX); |
| if (IS_ERR(clp)) { |
| dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); |
| return PTR_ERR(clp); |
| } |
| |
| 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|NFS_CAP_CHANGE_ATTR; |
| |
| 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_fh *mntfh, |
| 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->pnfs_blksize = fsinfo->blksize; |
| |
| server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); |
| |
| server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); |
| if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) |
| server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; |
| 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; |
| |
| server->time_delta = fsinfo->time_delta; |
| |
| /* 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 |
| */ |
| 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; |
| fsinfo.layouttype = 0; |
| error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); |
| if (error < 0) |
| goto out_error; |
| |
| nfs_server_set_fsinfo(server, mntfh, &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 |
| */ |
| 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; |
| } |
| |
| void nfs_server_insert_lists(struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
| |
| spin_lock(&nn->nfs_client_lock); |
| list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); |
| list_add_tail(&server->master_link, &nn->nfs_volume_list); |
| clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); |
| spin_unlock(&nn->nfs_client_lock); |
| |
| } |
| |
| static void nfs_server_remove_lists(struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs_net *nn; |
| |
| if (clp == NULL) |
| return; |
| nn = net_generic(clp->cl_net, nfs_net_id); |
| spin_lock(&nn->nfs_client_lock); |
| list_del_rcu(&server->client_link); |
| if (list_empty(&clp->cl_superblocks)) |
| set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); |
| list_del(&server->master_link); |
| spin_unlock(&nn->nfs_client_lock); |
| |
| synchronize_rcu(); |
| } |
| |
| /* |
| * Allocate and initialise a server record |
| */ |
| 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); |
| INIT_LIST_HEAD(&server->delegations); |
| INIT_LIST_HEAD(&server->layouts); |
| INIT_LIST_HEAD(&server->state_owners_lru); |
| |
| 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; |
| } |
| |
| ida_init(&server->openowner_id); |
| ida_init(&server->lockowner_id); |
| pnfs_init_server(server); |
| |
| return server; |
| } |
| |
| /* |
| * Free up a server record |
| */ |
| void nfs_free_server(struct nfs_server *server) |
| { |
| dprintk("--> nfs_free_server()\n"); |
| |
| nfs_server_remove_lists(server); |
| |
| 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); |
| |
| ida_destroy(&server->lockowner_id); |
| ida_destroy(&server->openowner_id); |
| 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_subversion *nfs_mod) |
| { |
| 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, nfs_mod); |
| 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); |
| |
| nfs_server_insert_lists(server); |
| server->mount_time = jiffies; |
| nfs_free_fattr(fattr); |
| return server; |
| |
| error: |
| nfs_free_fattr(fattr); |
| nfs_free_server(server); |
| return ERR_PTR(error); |
| } |
| |
| /* |
| * 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, |
| rpc_authflavor_t flavor) |
| { |
| 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; |
| server->destroy = source->destroy; |
| 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, |
| 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; |
| |
| nfs_server_insert_lists(server); |
| 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); |
| } |
| |
| void nfs_clients_init(struct net *net) |
| { |
| struct nfs_net *nn = net_generic(net, nfs_net_id); |
| |
| INIT_LIST_HEAD(&nn->nfs_client_list); |
| INIT_LIST_HEAD(&nn->nfs_volume_list); |
| #ifdef CONFIG_NFS_V4 |
| idr_init(&nn->cb_ident_idr); |
| #endif |
| spin_lock_init(&nn->nfs_client_lock); |
| nn->boot_time = CURRENT_TIME; |
| } |
| |
| #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; |
| struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; |
| struct net *net = pid_ns->child_reaper->nsproxy->net_ns; |
| |
| ret = seq_open(file, &nfs_server_list_ops); |
| if (ret < 0) |
| return ret; |
| |
| m = file->private_data; |
| m->private = net; |
| |
| 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 nfs_net *nn = net_generic(m->private, nfs_net_id); |
| |
| /* lock the list against modification */ |
| spin_lock(&nn->nfs_client_lock); |
| return seq_list_start_head(&nn->nfs_client_list, *_pos); |
| } |
| |
| /* |
| * move to next server |
| */ |
| static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) |
| { |
| struct nfs_net *nn = net_generic(p->private, nfs_net_id); |
| |
| return seq_list_next(v, &nn->nfs_client_list, pos); |
| } |
| |
| /* |
| * clean up after reading from the transports list |
| */ |
| static void nfs_server_list_stop(struct seq_file *p, void *v) |
| { |
| struct nfs_net *nn = net_generic(p->private, nfs_net_id); |
| |
| spin_unlock(&nn->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; |
| struct nfs_net *nn = net_generic(m->private, nfs_net_id); |
| |
| /* display header on line 1 */ |
| if (v == &nn->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); |
| |
| /* Check if the client is initialized */ |
| if (clp->cl_cons_state != NFS_CS_READY) |
| return 0; |
| |
| rcu_read_lock(); |
| 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); |
| rcu_read_unlock(); |
| |
| 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; |
| struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; |
| struct net *net = pid_ns->child_reaper->nsproxy->net_ns; |
| |
| ret = seq_open(file, &nfs_volume_list_ops); |
| if (ret < 0) |
| return ret; |
| |
| m = file->private_data; |
| m->private = net; |
| |
| 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 nfs_net *nn = net_generic(m->private, nfs_net_id); |
| |
| /* lock the list against modification */ |
| spin_lock(&nn->nfs_client_lock); |
| return seq_list_start_head(&nn->nfs_volume_list, *_pos); |
| } |
| |
| /* |
| * move to next volume |
| */ |
| static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) |
| { |
| struct nfs_net *nn = net_generic(p->private, nfs_net_id); |
| |
| return seq_list_next(v, &nn->nfs_volume_list, pos); |
| } |
| |
| /* |
| * clean up after reading from the transports list |
| */ |
| static void nfs_volume_list_stop(struct seq_file *p, void *v) |
| { |
| struct nfs_net *nn = net_generic(p->private, nfs_net_id); |
| |
| spin_unlock(&nn->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]; |
| struct nfs_net *nn = net_generic(m->private, nfs_net_id); |
| |
| /* display header on line 1 */ |
| if (v == &nn->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); |
| |
| rcu_read_lock(); |
| 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)); |
| rcu_read_unlock(); |
| |
| 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 */ |