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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Central processing for nfsd.
- *
- * Authors: Olaf Kirch (okir@monad.swb.de)
- *
- * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
- */
- #include <linux/sched/signal.h>
- #include <linux/freezer.h>
- #include <linux/module.h>
- #include <linux/fs_struct.h>
- #include <linux/swap.h>
- #include <linux/sunrpc/stats.h>
- #include <linux/sunrpc/svcsock.h>
- #include <linux/sunrpc/svc_xprt.h>
- #include <linux/lockd/bind.h>
- #include <linux/nfsacl.h>
- #include <linux/seq_file.h>
- #include <linux/inetdevice.h>
- #include <net/addrconf.h>
- #include <net/ipv6.h>
- #include <net/net_namespace.h>
- #include "nfsd.h"
- #include "cache.h"
- #include "vfs.h"
- #include "netns.h"
- #include "filecache.h"
- #define NFSDDBG_FACILITY NFSDDBG_SVC
- bool inter_copy_offload_enable;
- EXPORT_SYMBOL_GPL(inter_copy_offload_enable);
- module_param(inter_copy_offload_enable, bool, 0644);
- MODULE_PARM_DESC(inter_copy_offload_enable,
- "Enable inter server to server copy offload. Default: false");
- extern struct svc_program nfsd_program;
- static int nfsd(void *vrqstp);
- #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
- static int nfsd_acl_rpcbind_set(struct net *,
- const struct svc_program *,
- u32, int,
- unsigned short,
- unsigned short);
- static __be32 nfsd_acl_init_request(struct svc_rqst *,
- const struct svc_program *,
- struct svc_process_info *);
- #endif
- static int nfsd_rpcbind_set(struct net *,
- const struct svc_program *,
- u32, int,
- unsigned short,
- unsigned short);
- static __be32 nfsd_init_request(struct svc_rqst *,
- const struct svc_program *,
- struct svc_process_info *);
- /*
- * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members
- * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
- * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
- *
- * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a
- * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
- * of nfsd threads must exist and each must listed in ->sp_all_threads in each
- * entry of ->sv_pools[].
- *
- * Transitions of the thread count between zero and non-zero are of particular
- * interest since the svc_serv needs to be created and initialized at that
- * point, or freed.
- *
- * Finally, the nfsd_mutex also protects some of the global variables that are
- * accessed when nfsd starts and that are settable via the write_* routines in
- * nfsctl.c. In particular:
- *
- * user_recovery_dirname
- * user_lease_time
- * nfsd_versions
- */
- DEFINE_MUTEX(nfsd_mutex);
- /*
- * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
- * nfsd_drc_max_pages limits the total amount of memory available for
- * version 4.1 DRC caches.
- * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
- */
- spinlock_t nfsd_drc_lock;
- unsigned long nfsd_drc_max_mem;
- unsigned long nfsd_drc_mem_used;
- #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
- static struct svc_stat nfsd_acl_svcstats;
- static const struct svc_version *nfsd_acl_version[] = {
- [2] = &nfsd_acl_version2,
- [3] = &nfsd_acl_version3,
- };
- #define NFSD_ACL_MINVERS 2
- #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
- static struct svc_program nfsd_acl_program = {
- .pg_prog = NFS_ACL_PROGRAM,
- .pg_nvers = NFSD_ACL_NRVERS,
- .pg_vers = nfsd_acl_version,
- .pg_name = "nfsacl",
- .pg_class = "nfsd",
- .pg_stats = &nfsd_acl_svcstats,
- .pg_authenticate = &svc_set_client,
- .pg_init_request = nfsd_acl_init_request,
- .pg_rpcbind_set = nfsd_acl_rpcbind_set,
- };
- static struct svc_stat nfsd_acl_svcstats = {
- .program = &nfsd_acl_program,
- };
- #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
- static const struct svc_version *nfsd_version[] = {
- [2] = &nfsd_version2,
- #if defined(CONFIG_NFSD_V3)
- [3] = &nfsd_version3,
- #endif
- #if defined(CONFIG_NFSD_V4)
- [4] = &nfsd_version4,
- #endif
- };
- #define NFSD_MINVERS 2
- #define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
- struct svc_program nfsd_program = {
- #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
- .pg_next = &nfsd_acl_program,
- #endif
- .pg_prog = NFS_PROGRAM, /* program number */
- .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
- .pg_vers = nfsd_version, /* version table */
- .pg_name = "nfsd", /* program name */
- .pg_class = "nfsd", /* authentication class */
- .pg_stats = &nfsd_svcstats, /* version table */
- .pg_authenticate = &svc_set_client, /* export authentication */
- .pg_init_request = nfsd_init_request,
- .pg_rpcbind_set = nfsd_rpcbind_set,
- };
- static bool
- nfsd_support_version(int vers)
- {
- if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS)
- return nfsd_version[vers] != NULL;
- return false;
- }
- static bool *
- nfsd_alloc_versions(void)
- {
- bool *vers = kmalloc_array(NFSD_NRVERS, sizeof(bool), GFP_KERNEL);
- unsigned i;
- if (vers) {
- /* All compiled versions are enabled by default */
- for (i = 0; i < NFSD_NRVERS; i++)
- vers[i] = nfsd_support_version(i);
- }
- return vers;
- }
- static bool *
- nfsd_alloc_minorversions(void)
- {
- bool *vers = kmalloc_array(NFSD_SUPPORTED_MINOR_VERSION + 1,
- sizeof(bool), GFP_KERNEL);
- unsigned i;
- if (vers) {
- /* All minor versions are enabled by default */
- for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
- vers[i] = nfsd_support_version(4);
- }
- return vers;
- }
- void
- nfsd_netns_free_versions(struct nfsd_net *nn)
- {
- kfree(nn->nfsd_versions);
- kfree(nn->nfsd4_minorversions);
- nn->nfsd_versions = NULL;
- nn->nfsd4_minorversions = NULL;
- }
- static void
- nfsd_netns_init_versions(struct nfsd_net *nn)
- {
- if (!nn->nfsd_versions) {
- nn->nfsd_versions = nfsd_alloc_versions();
- nn->nfsd4_minorversions = nfsd_alloc_minorversions();
- if (!nn->nfsd_versions || !nn->nfsd4_minorversions)
- nfsd_netns_free_versions(nn);
- }
- }
- int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change)
- {
- if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
- return 0;
- switch(change) {
- case NFSD_SET:
- if (nn->nfsd_versions)
- nn->nfsd_versions[vers] = nfsd_support_version(vers);
- break;
- case NFSD_CLEAR:
- nfsd_netns_init_versions(nn);
- if (nn->nfsd_versions)
- nn->nfsd_versions[vers] = false;
- break;
- case NFSD_TEST:
- if (nn->nfsd_versions)
- return nn->nfsd_versions[vers];
- fallthrough;
- case NFSD_AVAIL:
- return nfsd_support_version(vers);
- }
- return 0;
- }
- static void
- nfsd_adjust_nfsd_versions4(struct nfsd_net *nn)
- {
- unsigned i;
- for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) {
- if (nn->nfsd4_minorversions[i])
- return;
- }
- nfsd_vers(nn, 4, NFSD_CLEAR);
- }
- int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change)
- {
- if (minorversion > NFSD_SUPPORTED_MINOR_VERSION &&
- change != NFSD_AVAIL)
- return -1;
- switch(change) {
- case NFSD_SET:
- if (nn->nfsd4_minorversions) {
- nfsd_vers(nn, 4, NFSD_SET);
- nn->nfsd4_minorversions[minorversion] =
- nfsd_vers(nn, 4, NFSD_TEST);
- }
- break;
- case NFSD_CLEAR:
- nfsd_netns_init_versions(nn);
- if (nn->nfsd4_minorversions) {
- nn->nfsd4_minorversions[minorversion] = false;
- nfsd_adjust_nfsd_versions4(nn);
- }
- break;
- case NFSD_TEST:
- if (nn->nfsd4_minorversions)
- return nn->nfsd4_minorversions[minorversion];
- return nfsd_vers(nn, 4, NFSD_TEST);
- case NFSD_AVAIL:
- return minorversion <= NFSD_SUPPORTED_MINOR_VERSION &&
- nfsd_vers(nn, 4, NFSD_AVAIL);
- }
- return 0;
- }
- /*
- * Maximum number of nfsd processes
- */
- #define NFSD_MAXSERVS 8192
- int nfsd_nrthreads(struct net *net)
- {
- int rv = 0;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- mutex_lock(&nfsd_mutex);
- if (nn->nfsd_serv)
- rv = nn->nfsd_serv->sv_nrthreads;
- mutex_unlock(&nfsd_mutex);
- return rv;
- }
- static int nfsd_init_socks(struct net *net, const struct cred *cred)
- {
- int error;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- if (!list_empty(&nn->nfsd_serv->sv_permsocks))
- return 0;
- error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT,
- SVC_SOCK_DEFAULTS, cred);
- if (error < 0)
- return error;
- error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT,
- SVC_SOCK_DEFAULTS, cred);
- if (error < 0)
- return error;
- return 0;
- }
- static int nfsd_users = 0;
- static int nfsd_startup_generic(int nrservs)
- {
- int ret;
- if (nfsd_users++)
- return 0;
- ret = nfsd_file_cache_init();
- if (ret)
- goto dec_users;
- ret = nfs4_state_start();
- if (ret)
- goto out_file_cache;
- return 0;
- out_file_cache:
- nfsd_file_cache_shutdown();
- dec_users:
- nfsd_users--;
- return ret;
- }
- static void nfsd_shutdown_generic(void)
- {
- if (--nfsd_users)
- return;
- nfs4_state_shutdown();
- nfsd_file_cache_shutdown();
- }
- static bool nfsd_needs_lockd(struct nfsd_net *nn)
- {
- return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST);
- }
- void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn)
- {
- int seq = 0;
- do {
- read_seqbegin_or_lock(&nn->boot_lock, &seq);
- /*
- * This is opaque to client, so no need to byte-swap. Use
- * __force to keep sparse happy. y2038 time_t overflow is
- * irrelevant in this usage
- */
- verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
- verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
- } while (need_seqretry(&nn->boot_lock, seq));
- done_seqretry(&nn->boot_lock, seq);
- }
- static void nfsd_reset_boot_verifier_locked(struct nfsd_net *nn)
- {
- ktime_get_real_ts64(&nn->nfssvc_boot);
- }
- void nfsd_reset_boot_verifier(struct nfsd_net *nn)
- {
- write_seqlock(&nn->boot_lock);
- nfsd_reset_boot_verifier_locked(nn);
- write_sequnlock(&nn->boot_lock);
- }
- static int nfsd_startup_net(int nrservs, struct net *net, const struct cred *cred)
- {
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- int ret;
- if (nn->nfsd_net_up)
- return 0;
- ret = nfsd_startup_generic(nrservs);
- if (ret)
- return ret;
- ret = nfsd_init_socks(net, cred);
- if (ret)
- goto out_socks;
- if (nfsd_needs_lockd(nn) && !nn->lockd_up) {
- ret = lockd_up(net, cred);
- if (ret)
- goto out_socks;
- nn->lockd_up = true;
- }
- ret = nfsd_file_cache_start_net(net);
- if (ret)
- goto out_lockd;
- ret = nfs4_state_start_net(net);
- if (ret)
- goto out_filecache;
- nn->nfsd_net_up = true;
- return 0;
- out_filecache:
- nfsd_file_cache_shutdown_net(net);
- out_lockd:
- if (nn->lockd_up) {
- lockd_down(net);
- nn->lockd_up = false;
- }
- out_socks:
- nfsd_shutdown_generic();
- return ret;
- }
- static void nfsd_shutdown_net(struct net *net)
- {
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- nfsd_file_cache_shutdown_net(net);
- nfs4_state_shutdown_net(net);
- if (nn->lockd_up) {
- lockd_down(net);
- nn->lockd_up = false;
- }
- nn->nfsd_net_up = false;
- nfsd_shutdown_generic();
- }
- static int nfsd_inetaddr_event(struct notifier_block *this, unsigned long event,
- void *ptr)
- {
- struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
- struct net_device *dev = ifa->ifa_dev->dev;
- struct net *net = dev_net(dev);
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- struct sockaddr_in sin;
- if ((event != NETDEV_DOWN) ||
- !atomic_inc_not_zero(&nn->ntf_refcnt))
- goto out;
- if (nn->nfsd_serv) {
- dprintk("nfsd_inetaddr_event: removed %pI4\n", &ifa->ifa_local);
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = ifa->ifa_local;
- svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin);
- }
- atomic_dec(&nn->ntf_refcnt);
- wake_up(&nn->ntf_wq);
- out:
- return NOTIFY_DONE;
- }
- static struct notifier_block nfsd_inetaddr_notifier = {
- .notifier_call = nfsd_inetaddr_event,
- };
- #if IS_ENABLED(CONFIG_IPV6)
- static int nfsd_inet6addr_event(struct notifier_block *this,
- unsigned long event, void *ptr)
- {
- struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
- struct net_device *dev = ifa->idev->dev;
- struct net *net = dev_net(dev);
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- struct sockaddr_in6 sin6;
- if ((event != NETDEV_DOWN) ||
- !atomic_inc_not_zero(&nn->ntf_refcnt))
- goto out;
- if (nn->nfsd_serv) {
- dprintk("nfsd_inet6addr_event: removed %pI6\n", &ifa->addr);
- sin6.sin6_family = AF_INET6;
- sin6.sin6_addr = ifa->addr;
- if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
- sin6.sin6_scope_id = ifa->idev->dev->ifindex;
- svc_age_temp_xprts_now(nn->nfsd_serv, (struct sockaddr *)&sin6);
- }
- atomic_dec(&nn->ntf_refcnt);
- wake_up(&nn->ntf_wq);
- out:
- return NOTIFY_DONE;
- }
- static struct notifier_block nfsd_inet6addr_notifier = {
- .notifier_call = nfsd_inet6addr_event,
- };
- #endif
- /* Only used under nfsd_mutex, so this atomic may be overkill: */
- static atomic_t nfsd_notifier_refcount = ATOMIC_INIT(0);
- static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
- {
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- atomic_dec(&nn->ntf_refcnt);
- /* check if the notifier still has clients */
- if (atomic_dec_return(&nfsd_notifier_refcount) == 0) {
- unregister_inetaddr_notifier(&nfsd_inetaddr_notifier);
- #if IS_ENABLED(CONFIG_IPV6)
- unregister_inet6addr_notifier(&nfsd_inet6addr_notifier);
- #endif
- }
- wait_event(nn->ntf_wq, atomic_read(&nn->ntf_refcnt) == 0);
- /*
- * write_ports can create the server without actually starting
- * any threads--if we get shut down before any threads are
- * started, then nfsd_last_thread will be run before any of this
- * other initialization has been done except the rpcb information.
- */
- svc_rpcb_cleanup(serv, net);
- if (!nn->nfsd_net_up)
- return;
- nfsd_shutdown_net(net);
- pr_info("nfsd: last server has exited, flushing export cache\n");
- nfsd_export_flush(net);
- }
- void nfsd_reset_versions(struct nfsd_net *nn)
- {
- int i;
- for (i = 0; i < NFSD_NRVERS; i++)
- if (nfsd_vers(nn, i, NFSD_TEST))
- return;
- for (i = 0; i < NFSD_NRVERS; i++)
- if (i != 4)
- nfsd_vers(nn, i, NFSD_SET);
- else {
- int minor = 0;
- while (nfsd_minorversion(nn, minor, NFSD_SET) >= 0)
- minor++;
- }
- }
- /*
- * Each session guarantees a negotiated per slot memory cache for replies
- * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
- * NFSv4.1 server might want to use more memory for a DRC than a machine
- * with mutiple services.
- *
- * Impose a hard limit on the number of pages for the DRC which varies
- * according to the machines free pages. This is of course only a default.
- *
- * For now this is a #defined shift which could be under admin control
- * in the future.
- */
- static void set_max_drc(void)
- {
- #define NFSD_DRC_SIZE_SHIFT 7
- nfsd_drc_max_mem = (nr_free_buffer_pages()
- >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
- nfsd_drc_mem_used = 0;
- spin_lock_init(&nfsd_drc_lock);
- dprintk("%s nfsd_drc_max_mem %lu \n", __func__, nfsd_drc_max_mem);
- }
- static int nfsd_get_default_max_blksize(void)
- {
- struct sysinfo i;
- unsigned long long target;
- unsigned long ret;
- si_meminfo(&i);
- target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
- /*
- * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
- * machines, but only uses 32K on 128M machines. Bottom out at
- * 8K on 32M and smaller. Of course, this is only a default.
- */
- target >>= 12;
- ret = NFSSVC_MAXBLKSIZE;
- while (ret > target && ret >= 8*1024*2)
- ret /= 2;
- return ret;
- }
- static const struct svc_serv_ops nfsd_thread_sv_ops = {
- .svo_shutdown = nfsd_last_thread,
- .svo_function = nfsd,
- .svo_enqueue_xprt = svc_xprt_do_enqueue,
- .svo_setup = svc_set_num_threads,
- .svo_module = THIS_MODULE,
- };
- bool i_am_nfsd(void)
- {
- return kthread_func(current) == nfsd;
- }
- int nfsd_create_serv(struct net *net)
- {
- int error;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- WARN_ON(!mutex_is_locked(&nfsd_mutex));
- if (nn->nfsd_serv) {
- svc_get(nn->nfsd_serv);
- return 0;
- }
- if (nfsd_max_blksize == 0)
- nfsd_max_blksize = nfsd_get_default_max_blksize();
- nfsd_reset_versions(nn);
- nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
- &nfsd_thread_sv_ops);
- if (nn->nfsd_serv == NULL)
- return -ENOMEM;
- nn->nfsd_serv->sv_maxconn = nn->max_connections;
- error = svc_bind(nn->nfsd_serv, net);
- if (error < 0) {
- svc_destroy(nn->nfsd_serv);
- return error;
- }
- set_max_drc();
- /* check if the notifier is already set */
- if (atomic_inc_return(&nfsd_notifier_refcount) == 1) {
- register_inetaddr_notifier(&nfsd_inetaddr_notifier);
- #if IS_ENABLED(CONFIG_IPV6)
- register_inet6addr_notifier(&nfsd_inet6addr_notifier);
- #endif
- }
- atomic_inc(&nn->ntf_refcnt);
- nfsd_reset_boot_verifier(nn);
- return 0;
- }
- int nfsd_nrpools(struct net *net)
- {
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- if (nn->nfsd_serv == NULL)
- return 0;
- else
- return nn->nfsd_serv->sv_nrpools;
- }
- int nfsd_get_nrthreads(int n, int *nthreads, struct net *net)
- {
- int i = 0;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- if (nn->nfsd_serv != NULL) {
- for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++)
- nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads;
- }
- return 0;
- }
- void nfsd_destroy(struct net *net)
- {
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- int destroy = (nn->nfsd_serv->sv_nrthreads == 1);
- if (destroy)
- svc_shutdown_net(nn->nfsd_serv, net);
- svc_destroy(nn->nfsd_serv);
- if (destroy)
- nn->nfsd_serv = NULL;
- }
- int nfsd_set_nrthreads(int n, int *nthreads, struct net *net)
- {
- int i = 0;
- int tot = 0;
- int err = 0;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- WARN_ON(!mutex_is_locked(&nfsd_mutex));
- if (nn->nfsd_serv == NULL || n <= 0)
- return 0;
- if (n > nn->nfsd_serv->sv_nrpools)
- n = nn->nfsd_serv->sv_nrpools;
- /* enforce a global maximum number of threads */
- tot = 0;
- for (i = 0; i < n; i++) {
- nthreads[i] = min(nthreads[i], NFSD_MAXSERVS);
- tot += nthreads[i];
- }
- if (tot > NFSD_MAXSERVS) {
- /* total too large: scale down requested numbers */
- for (i = 0; i < n && tot > 0; i++) {
- int new = nthreads[i] * NFSD_MAXSERVS / tot;
- tot -= (nthreads[i] - new);
- nthreads[i] = new;
- }
- for (i = 0; i < n && tot > 0; i++) {
- nthreads[i]--;
- tot--;
- }
- }
- /*
- * There must always be a thread in pool 0; the admin
- * can't shut down NFS completely using pool_threads.
- */
- if (nthreads[0] == 0)
- nthreads[0] = 1;
- /* apply the new numbers */
- svc_get(nn->nfsd_serv);
- for (i = 0; i < n; i++) {
- err = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
- &nn->nfsd_serv->sv_pools[i], nthreads[i]);
- if (err)
- break;
- }
- nfsd_destroy(net);
- return err;
- }
- /*
- * Adjust the number of threads and return the new number of threads.
- * This is also the function that starts the server if necessary, if
- * this is the first time nrservs is nonzero.
- */
- int
- nfsd_svc(int nrservs, struct net *net, const struct cred *cred)
- {
- int error;
- bool nfsd_up_before;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- mutex_lock(&nfsd_mutex);
- dprintk("nfsd: creating service\n");
- nrservs = max(nrservs, 0);
- nrservs = min(nrservs, NFSD_MAXSERVS);
- error = 0;
- if (nrservs == 0 && nn->nfsd_serv == NULL)
- goto out;
- strlcpy(nn->nfsd_name, utsname()->nodename,
- sizeof(nn->nfsd_name));
- error = nfsd_create_serv(net);
- if (error)
- goto out;
- nfsd_up_before = nn->nfsd_net_up;
- error = nfsd_startup_net(nrservs, net, cred);
- if (error)
- goto out_destroy;
- error = nn->nfsd_serv->sv_ops->svo_setup(nn->nfsd_serv,
- NULL, nrservs);
- if (error)
- goto out_shutdown;
- /* We are holding a reference to nn->nfsd_serv which
- * we don't want to count in the return value,
- * so subtract 1
- */
- error = nn->nfsd_serv->sv_nrthreads - 1;
- out_shutdown:
- if (error < 0 && !nfsd_up_before)
- nfsd_shutdown_net(net);
- out_destroy:
- nfsd_destroy(net); /* Release server */
- out:
- mutex_unlock(&nfsd_mutex);
- return error;
- }
- #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
- static bool
- nfsd_support_acl_version(int vers)
- {
- if (vers >= NFSD_ACL_MINVERS && vers < NFSD_ACL_NRVERS)
- return nfsd_acl_version[vers] != NULL;
- return false;
- }
- static int
- nfsd_acl_rpcbind_set(struct net *net, const struct svc_program *progp,
- u32 version, int family, unsigned short proto,
- unsigned short port)
- {
- if (!nfsd_support_acl_version(version) ||
- !nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST))
- return 0;
- return svc_generic_rpcbind_set(net, progp, version, family,
- proto, port);
- }
- static __be32
- nfsd_acl_init_request(struct svc_rqst *rqstp,
- const struct svc_program *progp,
- struct svc_process_info *ret)
- {
- struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
- int i;
- if (likely(nfsd_support_acl_version(rqstp->rq_vers) &&
- nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
- return svc_generic_init_request(rqstp, progp, ret);
- ret->mismatch.lovers = NFSD_ACL_NRVERS;
- for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) {
- if (nfsd_support_acl_version(rqstp->rq_vers) &&
- nfsd_vers(nn, i, NFSD_TEST)) {
- ret->mismatch.lovers = i;
- break;
- }
- }
- if (ret->mismatch.lovers == NFSD_ACL_NRVERS)
- return rpc_prog_unavail;
- ret->mismatch.hivers = NFSD_ACL_MINVERS;
- for (i = NFSD_ACL_NRVERS - 1; i >= NFSD_ACL_MINVERS; i--) {
- if (nfsd_support_acl_version(rqstp->rq_vers) &&
- nfsd_vers(nn, i, NFSD_TEST)) {
- ret->mismatch.hivers = i;
- break;
- }
- }
- return rpc_prog_mismatch;
- }
- #endif
- static int
- nfsd_rpcbind_set(struct net *net, const struct svc_program *progp,
- u32 version, int family, unsigned short proto,
- unsigned short port)
- {
- if (!nfsd_vers(net_generic(net, nfsd_net_id), version, NFSD_TEST))
- return 0;
- return svc_generic_rpcbind_set(net, progp, version, family,
- proto, port);
- }
- static __be32
- nfsd_init_request(struct svc_rqst *rqstp,
- const struct svc_program *progp,
- struct svc_process_info *ret)
- {
- struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
- int i;
- if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
- return svc_generic_init_request(rqstp, progp, ret);
- ret->mismatch.lovers = NFSD_NRVERS;
- for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
- if (nfsd_vers(nn, i, NFSD_TEST)) {
- ret->mismatch.lovers = i;
- break;
- }
- }
- if (ret->mismatch.lovers == NFSD_NRVERS)
- return rpc_prog_unavail;
- ret->mismatch.hivers = NFSD_MINVERS;
- for (i = NFSD_NRVERS - 1; i >= NFSD_MINVERS; i--) {
- if (nfsd_vers(nn, i, NFSD_TEST)) {
- ret->mismatch.hivers = i;
- break;
- }
- }
- return rpc_prog_mismatch;
- }
- /*
- * This is the NFS server kernel thread
- */
- static int
- nfsd(void *vrqstp)
- {
- struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
- struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list);
- struct net *net = perm_sock->xpt_net;
- struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- int err;
- /* Lock module and set up kernel thread */
- mutex_lock(&nfsd_mutex);
- /* At this point, the thread shares current->fs
- * with the init process. We need to create files with the
- * umask as defined by the client instead of init's umask. */
- if (unshare_fs_struct() < 0) {
- printk("Unable to start nfsd thread: out of memory\n");
- goto out;
- }
- current->fs->umask = 0;
- /*
- * thread is spawned with all signals set to SIG_IGN, re-enable
- * the ones that will bring down the thread
- */
- allow_signal(SIGKILL);
- allow_signal(SIGHUP);
- allow_signal(SIGINT);
- allow_signal(SIGQUIT);
- nfsdstats.th_cnt++;
- mutex_unlock(&nfsd_mutex);
- set_freezable();
- /*
- * The main request loop
- */
- for (;;) {
- /* Update sv_maxconn if it has changed */
- rqstp->rq_server->sv_maxconn = nn->max_connections;
- /*
- * Find a socket with data available and call its
- * recvfrom routine.
- */
- while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
- ;
- if (err == -EINTR)
- break;
- validate_process_creds();
- svc_process(rqstp);
- validate_process_creds();
- }
- /* Clear signals before calling svc_exit_thread() */
- flush_signals(current);
- mutex_lock(&nfsd_mutex);
- nfsdstats.th_cnt --;
- out:
- rqstp->rq_server = NULL;
- /* Release the thread */
- svc_exit_thread(rqstp);
- nfsd_destroy(net);
- /* Release module */
- mutex_unlock(&nfsd_mutex);
- module_put_and_exit(0);
- return 0;
- }
- /*
- * A write procedure can have a large argument, and a read procedure can
- * have a large reply, but no NFSv2 or NFSv3 procedure has argument and
- * reply that can both be larger than a page. The xdr code has taken
- * advantage of this assumption to be a sloppy about bounds checking in
- * some cases. Pending a rewrite of the NFSv2/v3 xdr code to fix that
- * problem, we enforce these assumptions here:
- */
- static bool nfs_request_too_big(struct svc_rqst *rqstp,
- const struct svc_procedure *proc)
- {
- /*
- * The ACL code has more careful bounds-checking and is not
- * susceptible to this problem:
- */
- if (rqstp->rq_prog != NFS_PROGRAM)
- return false;
- /*
- * Ditto NFSv4 (which can in theory have argument and reply both
- * more than a page):
- */
- if (rqstp->rq_vers >= 4)
- return false;
- /* The reply will be small, we're OK: */
- if (proc->pc_xdrressize > 0 &&
- proc->pc_xdrressize < XDR_QUADLEN(PAGE_SIZE))
- return false;
- return rqstp->rq_arg.len > PAGE_SIZE;
- }
- /**
- * nfsd_dispatch - Process an NFS or NFSACL Request
- * @rqstp: incoming request
- * @statp: pointer to location of accept_stat field in RPC Reply buffer
- *
- * This RPC dispatcher integrates the NFS server's duplicate reply cache.
- *
- * Return values:
- * %0: Processing complete; do not send a Reply
- * %1: Processing complete; send Reply in rqstp->rq_res
- */
- int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
- {
- const struct svc_procedure *proc = rqstp->rq_procinfo;
- struct kvec *argv = &rqstp->rq_arg.head[0];
- struct kvec *resv = &rqstp->rq_res.head[0];
- __be32 *p;
- dprintk("nfsd_dispatch: vers %d proc %d\n",
- rqstp->rq_vers, rqstp->rq_proc);
- if (nfs_request_too_big(rqstp, proc))
- goto out_too_large;
- /*
- * Give the xdr decoder a chance to change this if it wants
- * (necessary in the NFSv4.0 compound case)
- */
- rqstp->rq_cachetype = proc->pc_cachetype;
- if (!proc->pc_decode(rqstp, argv->iov_base))
- goto out_decode_err;
- switch (nfsd_cache_lookup(rqstp)) {
- case RC_DOIT:
- break;
- case RC_REPLY:
- goto out_cached_reply;
- case RC_DROPIT:
- goto out_dropit;
- }
- /*
- * Need to grab the location to store the status, as
- * NFSv4 does some encoding while processing
- */
- p = resv->iov_base + resv->iov_len;
- resv->iov_len += sizeof(__be32);
- *statp = proc->pc_func(rqstp);
- if (*statp == rpc_drop_reply || test_bit(RQ_DROPME, &rqstp->rq_flags))
- goto out_update_drop;
- if (!proc->pc_encode(rqstp, p))
- goto out_encode_err;
- nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1);
- out_cached_reply:
- return 1;
- out_too_large:
- dprintk("nfsd: NFSv%d argument too large\n", rqstp->rq_vers);
- *statp = rpc_garbage_args;
- return 1;
- out_decode_err:
- dprintk("nfsd: failed to decode arguments!\n");
- *statp = rpc_garbage_args;
- return 1;
- out_update_drop:
- dprintk("nfsd: Dropping request; may be revisited later\n");
- nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
- out_dropit:
- return 0;
- out_encode_err:
- dprintk("nfsd: failed to encode result!\n");
- nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
- *statp = rpc_system_err;
- return 1;
- }
- int nfsd_pool_stats_open(struct inode *inode, struct file *file)
- {
- int ret;
- struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
- mutex_lock(&nfsd_mutex);
- if (nn->nfsd_serv == NULL) {
- mutex_unlock(&nfsd_mutex);
- return -ENODEV;
- }
- /* bump up the psudo refcount while traversing */
- svc_get(nn->nfsd_serv);
- ret = svc_pool_stats_open(nn->nfsd_serv, file);
- mutex_unlock(&nfsd_mutex);
- return ret;
- }
- int nfsd_pool_stats_release(struct inode *inode, struct file *file)
- {
- int ret = seq_release(inode, file);
- struct net *net = inode->i_sb->s_fs_info;
- mutex_lock(&nfsd_mutex);
- /* this function really, really should have been called svc_put() */
- nfsd_destroy(net);
- mutex_unlock(&nfsd_mutex);
- return ret;
- }
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