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-rw-r--r--fs/nfsd/nfssvc.c1135
1 files changed, 1135 insertions, 0 deletions
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
new file mode 100644
index 000000000..2e61a565c
--- /dev/null
+++ b/fs/nfsd/nfssvc.c
@@ -0,0 +1,1135 @@
+// 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);
+
+ nfs4_state_shutdown_net(net);
+ nfsd_file_cache_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,
+};
+
+static void nfsd_complete_shutdown(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ WARN_ON(!mutex_is_locked(&nfsd_mutex));
+
+ nn->nfsd_serv = NULL;
+ complete(&nn->nfsd_shutdown_complete);
+}
+
+void nfsd_shutdown_threads(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ struct svc_serv *serv;
+
+ mutex_lock(&nfsd_mutex);
+ serv = nn->nfsd_serv;
+ if (serv == NULL) {
+ mutex_unlock(&nfsd_mutex);
+ return;
+ }
+
+ svc_get(serv);
+ /* Kill outstanding nfsd threads */
+ serv->sv_ops->svo_setup(serv, NULL, 0);
+ nfsd_destroy(net);
+ mutex_unlock(&nfsd_mutex);
+ /* Wait for shutdown of nfsd_serv to complete */
+ wait_for_completion(&nn->nfsd_shutdown_complete);
+}
+
+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;
+ init_completion(&nn->nfsd_shutdown_complete);
+
+ nn->nfsd_serv->sv_maxconn = nn->max_connections;
+ error = svc_bind(nn->nfsd_serv, net);
+ if (error < 0) {
+ svc_destroy(nn->nfsd_serv);
+ nfsd_complete_shutdown(net);
+ 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)
+ nfsd_complete_shutdown(net);
+}
+
+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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-17 09:24:03 +0000