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- /* 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/addr.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/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
- };
- 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("nfsv%d", version);
- nfs = find_nfs_version(version);
- mutex_unlock(&nfs_version_mutex);
- }
- if (!IS_ERR(nfs) && !try_module_get(nfs->owner))
- return ERR_PTR(-EAGAIN);
- 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);
- /*
- * 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;
- if (!try_module_get(clp->cl_nfs_mod->owner))
- goto error_dealloc;
- 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);
- error_dealloc:
- kfree(clp);
- error_0:
- return ERR_PTR(err);
- }
- EXPORT_SYMBOL_GPL(nfs_alloc_client);
- #if IS_ENABLED(CONFIG_NFS_V4)
- 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->cl_acceptor);
- kfree(clp);
- dprintk("<-- nfs_free_client()\n");
- }
- EXPORT_SYMBOL_GPL(nfs_free_client);
- /*
- * 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);
- WARN_ON_ONCE(!list_empty(&clp->cl_superblocks));
- clp->rpc_ops->free_client(clp);
- }
- }
- EXPORT_SYMBOL_GPL(nfs_put_client);
- /*
- * 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 (!rpc_cmp_addr_port(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_READY;
- }
- 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));
- }
- EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete);
- /*
- * 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;
- if (cl_init->hostname == NULL) {
- WARN_ON(1);
- return NULL;
- }
- 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_tail(&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);
- }
- 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;
- }
- EXPORT_SYMBOL_GPL(nfs_get_client);
- /*
- * 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);
- }
- EXPORT_SYMBOL_GPL(nfs_mark_client_ready);
- /*
- * 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();
- }
- }
- EXPORT_SYMBOL_GPL(nfs_init_timeout_values);
- /*
- * 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_NO_RETRANS_TIMEOUT, &clp->cl_flags))
- args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
- if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
- args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
- if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
- args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS;
- 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;
- }
- EXPORT_SYMBOL_GPL(nfs_create_rpc_client);
- /*
- * Version 2 or 3 client destruction
- */
- static void nfs_destroy_server(struct nfs_server *server)
- {
- if (server->nlm_host)
- 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;
- }
- /*
- * 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_set_auth(clp->cl_rpcclient,
- pseudoflavour);
- 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;
- server->client->cl_softrtry = 0;
- if (server->flags & NFS_MOUNT_SOFT)
- server->client->cl_softrtry = 1;
- return 0;
- }
- EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient);
- /**
- * 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)
- *
- * 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)
- {
- 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);
- }
- EXPORT_SYMBOL_GPL(nfs_init_client);
- /*
- * 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;
- 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;
- server->auth_info = data->auth_info;
- error = nfs_init_server_rpcclient(server, &timeparms,
- data->selected_flavor);
- 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;
- 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 * 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;
- server->clone_blksize = fsinfo->clone_blksize;
- /* 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, &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;
- }
- EXPORT_SYMBOL_GPL(nfs_probe_fsinfo);
- /*
- * 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;
- target->auth_info = source->auth_info;
- }
- EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
- 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);
- }
- EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
- 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();
- }
- EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
- /*
- * 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;
- }
- EXPORT_SYMBOL_GPL(nfs_alloc_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");
- }
- EXPORT_SYMBOL_GPL(nfs_free_server);
- /*
- * Create a version 2 or 3 volume record
- * - keyed on server and FSID
- */
- struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info,
- 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, mount_info->parsed, nfs_mod);
- if (error < 0)
- goto error;
- /* Probe the root fh to retrieve its FSID */
- error = nfs_probe_fsinfo(server, mount_info->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 (!(mount_info->parsed->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 = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL);
- 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);
- }
- EXPORT_SYMBOL_GPL(nfs_create_server);
- /*
- * 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;
- /* 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);
- }
- EXPORT_SYMBOL_GPL(nfs_clone_server);
- 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);
- #if IS_ENABLED(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 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_net,
- .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_net,
- .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)
- {
- return seq_open_net(inode, file, &nfs_server_list_ops,
- sizeof(struct seq_net_private));
- }
- /*
- * 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)
- __acquires(&nn->nfs_client_lock)
- {
- struct nfs_net *nn = net_generic(seq_file_net(m), 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(seq_file_net(p), 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)
- __releases(&nn->nfs_client_lock)
- {
- struct nfs_net *nn = net_generic(seq_file_net(p), 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(seq_file_net(m), 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)
- {
- return seq_open_net(inode, file, &nfs_volume_list_ops,
- sizeof(struct seq_net_private));
- }
- /*
- * 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)
- __acquires(&nn->nfs_client_lock)
- {
- struct nfs_net *nn = net_generic(seq_file_net(m), 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(seq_file_net(p), 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)
- __releases(&nn->nfs_client_lock)
- {
- struct nfs_net *nn = net_generic(seq_file_net(p), 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[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0'
- char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0'
- struct nfs_net *nn = net_generic(seq_file_net(m), 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, sizeof(dev), "%u:%u",
- MAJOR(server->s_dev), MINOR(server->s_dev));
- snprintf(fsid, sizeof(fsid), "%llx:%llx",
- (unsigned long long) server->fsid.major,
- (unsigned long long) server->fsid.minor);
- rcu_read_lock();
- seq_printf(m, "v%u %s %s %-12s %-33s %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;
- }
- int nfs_fs_proc_net_init(struct net *net)
- {
- struct nfs_net *nn = net_generic(net, nfs_net_id);
- struct proc_dir_entry *p;
- nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net);
- if (!nn->proc_nfsfs)
- goto error_0;
- /* a file of servers with which we're dealing */
- p = proc_create("servers", S_IFREG|S_IRUGO,
- nn->proc_nfsfs, &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,
- nn->proc_nfsfs, &nfs_volume_list_fops);
- if (!p)
- goto error_1;
- return 0;
- error_1:
- remove_proc_subtree("nfsfs", net->proc_net);
- error_0:
- return -ENOMEM;
- }
- void nfs_fs_proc_net_exit(struct net *net)
- {
- remove_proc_subtree("nfsfs", net->proc_net);
- }
- /*
- * initialise the /proc/fs/nfsfs/ directory
- */
- int __init nfs_fs_proc_init(void)
- {
- if (!proc_mkdir("fs/nfsfs", NULL))
- goto error_0;
- /* a file of servers with which we're dealing */
- if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers"))
- goto error_1;
- /* a file of volumes that we have mounted */
- if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes"))
- goto error_1;
- return 0;
- error_1:
- remove_proc_subtree("fs/nfsfs", NULL);
- error_0:
- return -ENOMEM;
- }
- /*
- * clean up the /proc/fs/nfsfs/ directory
- */
- void nfs_fs_proc_exit(void)
- {
- remove_proc_subtree("fs/nfsfs", NULL);
- }
- #endif /* CONFIG_PROC_FS */
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