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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /fs/lockd/svc.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'fs/lockd/svc.c')
-rw-r--r--fs/lockd/svc.c568
1 files changed, 568 insertions, 0 deletions
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
new file mode 100644
index 00000000000..2444780f5cf
--- /dev/null
+++ b/fs/lockd/svc.c
@@ -0,0 +1,568 @@
+/*
+ * linux/fs/lockd/svc.c
+ *
+ * This is the central lockd service.
+ *
+ * FIXME: Separate the lockd NFS server functionality from the lockd NFS
+ * client functionality. Oh why didn't Sun create two separate
+ * services in the first place?
+ *
+ * Authors: Olaf Kirch (okir@monad.swb.de)
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/moduleparam.h>
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/uio.h>
+#include <linux/smp.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcsock.h>
+#include <net/ip.h>
+#include <linux/lockd/lockd.h>
+#include <linux/nfs.h>
+
+#define NLMDBG_FACILITY NLMDBG_SVC
+#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
+#define ALLOWED_SIGS (sigmask(SIGKILL))
+
+static struct svc_program nlmsvc_program;
+
+struct nlmsvc_binding * nlmsvc_ops;
+EXPORT_SYMBOL_GPL(nlmsvc_ops);
+
+static DEFINE_MUTEX(nlmsvc_mutex);
+static unsigned int nlmsvc_users;
+static struct task_struct *nlmsvc_task;
+static struct svc_rqst *nlmsvc_rqst;
+unsigned long nlmsvc_timeout;
+
+/*
+ * These can be set at insmod time (useful for NFS as root filesystem),
+ * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
+ */
+static unsigned long nlm_grace_period;
+static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
+static int nlm_udpport, nlm_tcpport;
+
+/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
+static unsigned int nlm_max_connections = 1024;
+
+/*
+ * Constants needed for the sysctl interface.
+ */
+static const unsigned long nlm_grace_period_min = 0;
+static const unsigned long nlm_grace_period_max = 240;
+static const unsigned long nlm_timeout_min = 3;
+static const unsigned long nlm_timeout_max = 20;
+static const int nlm_port_min = 0, nlm_port_max = 65535;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table_header * nlm_sysctl_table;
+#endif
+
+static unsigned long get_lockd_grace_period(void)
+{
+ /* Note: nlm_timeout should always be nonzero */
+ if (nlm_grace_period)
+ return roundup(nlm_grace_period, nlm_timeout) * HZ;
+ else
+ return nlm_timeout * 5 * HZ;
+}
+
+static struct lock_manager lockd_manager = {
+};
+
+static void grace_ender(struct work_struct *not_used)
+{
+ locks_end_grace(&lockd_manager);
+}
+
+static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
+
+static void set_grace_period(void)
+{
+ unsigned long grace_period = get_lockd_grace_period();
+
+ locks_start_grace(&lockd_manager);
+ cancel_delayed_work_sync(&grace_period_end);
+ schedule_delayed_work(&grace_period_end, grace_period);
+}
+
+static void restart_grace(void)
+{
+ if (nlmsvc_ops) {
+ cancel_delayed_work_sync(&grace_period_end);
+ locks_end_grace(&lockd_manager);
+ nlmsvc_invalidate_all();
+ set_grace_period();
+ }
+}
+
+/*
+ * This is the lockd kernel thread
+ */
+static int
+lockd(void *vrqstp)
+{
+ int err = 0, preverr = 0;
+ struct svc_rqst *rqstp = vrqstp;
+
+ /* try_to_freeze() is called from svc_recv() */
+ set_freezable();
+
+ /* Allow SIGKILL to tell lockd to drop all of its locks */
+ allow_signal(SIGKILL);
+
+ dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
+
+ if (!nlm_timeout)
+ nlm_timeout = LOCKD_DFLT_TIMEO;
+ nlmsvc_timeout = nlm_timeout * HZ;
+
+ set_grace_period();
+
+ /*
+ * The main request loop. We don't terminate until the last
+ * NFS mount or NFS daemon has gone away.
+ */
+ while (!kthread_should_stop()) {
+ long timeout = MAX_SCHEDULE_TIMEOUT;
+ RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+ /* update sv_maxconn if it has changed */
+ rqstp->rq_server->sv_maxconn = nlm_max_connections;
+
+ if (signalled()) {
+ flush_signals(current);
+ restart_grace();
+ continue;
+ }
+
+ timeout = nlmsvc_retry_blocked();
+
+ /*
+ * Find a socket with data available and call its
+ * recvfrom routine.
+ */
+ err = svc_recv(rqstp, timeout);
+ if (err == -EAGAIN || err == -EINTR) {
+ preverr = err;
+ continue;
+ }
+ if (err < 0) {
+ if (err != preverr) {
+ printk(KERN_WARNING "%s: unexpected error "
+ "from svc_recv (%d)\n", __func__, err);
+ preverr = err;
+ }
+ schedule_timeout_interruptible(HZ);
+ continue;
+ }
+ preverr = err;
+
+ dprintk("lockd: request from %s\n",
+ svc_print_addr(rqstp, buf, sizeof(buf)));
+
+ svc_process(rqstp);
+ }
+ flush_signals(current);
+ cancel_delayed_work_sync(&grace_period_end);
+ locks_end_grace(&lockd_manager);
+ if (nlmsvc_ops)
+ nlmsvc_invalidate_all();
+ nlm_shutdown_hosts();
+ return 0;
+}
+
+static int create_lockd_listener(struct svc_serv *serv, const char *name,
+ const int family, const unsigned short port)
+{
+ struct svc_xprt *xprt;
+
+ xprt = svc_find_xprt(serv, name, family, 0);
+ if (xprt == NULL)
+ return svc_create_xprt(serv, name, &init_net, family, port,
+ SVC_SOCK_DEFAULTS);
+ svc_xprt_put(xprt);
+ return 0;
+}
+
+static int create_lockd_family(struct svc_serv *serv, const int family)
+{
+ int err;
+
+ err = create_lockd_listener(serv, "udp", family, nlm_udpport);
+ if (err < 0)
+ return err;
+
+ return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
+}
+
+/*
+ * Ensure there are active UDP and TCP listeners for lockd.
+ *
+ * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
+ * local services (such as rpc.statd) still require UDP, and
+ * some NFS servers do not yet support NLM over TCP.
+ *
+ * Returns zero if all listeners are available; otherwise a
+ * negative errno value is returned.
+ */
+static int make_socks(struct svc_serv *serv)
+{
+ static int warned;
+ int err;
+
+ err = create_lockd_family(serv, PF_INET);
+ if (err < 0)
+ goto out_err;
+
+ err = create_lockd_family(serv, PF_INET6);
+ if (err < 0 && err != -EAFNOSUPPORT)
+ goto out_err;
+
+ warned = 0;
+ return 0;
+
+out_err:
+ if (warned++ == 0)
+ printk(KERN_WARNING
+ "lockd_up: makesock failed, error=%d\n", err);
+ return err;
+}
+
+/*
+ * Bring up the lockd process if it's not already up.
+ */
+int lockd_up(void)
+{
+ struct svc_serv *serv;
+ int error = 0;
+
+ mutex_lock(&nlmsvc_mutex);
+ /*
+ * Check whether we're already up and running.
+ */
+ if (nlmsvc_rqst)
+ goto out;
+
+ /*
+ * Sanity check: if there's no pid,
+ * we should be the first user ...
+ */
+ if (nlmsvc_users)
+ printk(KERN_WARNING
+ "lockd_up: no pid, %d users??\n", nlmsvc_users);
+
+ error = -ENOMEM;
+ serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
+ if (!serv) {
+ printk(KERN_WARNING "lockd_up: create service failed\n");
+ goto out;
+ }
+
+ error = make_socks(serv);
+ if (error < 0)
+ goto destroy_and_out;
+
+ /*
+ * Create the kernel thread and wait for it to start.
+ */
+ nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
+ if (IS_ERR(nlmsvc_rqst)) {
+ error = PTR_ERR(nlmsvc_rqst);
+ nlmsvc_rqst = NULL;
+ printk(KERN_WARNING
+ "lockd_up: svc_rqst allocation failed, error=%d\n",
+ error);
+ goto destroy_and_out;
+ }
+
+ svc_sock_update_bufs(serv);
+ serv->sv_maxconn = nlm_max_connections;
+
+ nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
+ if (IS_ERR(nlmsvc_task)) {
+ error = PTR_ERR(nlmsvc_task);
+ svc_exit_thread(nlmsvc_rqst);
+ nlmsvc_task = NULL;
+ nlmsvc_rqst = NULL;
+ printk(KERN_WARNING
+ "lockd_up: kthread_run failed, error=%d\n", error);
+ goto destroy_and_out;
+ }
+
+ /*
+ * Note: svc_serv structures have an initial use count of 1,
+ * so we exit through here on both success and failure.
+ */
+destroy_and_out:
+ svc_destroy(serv);
+out:
+ if (!error)
+ nlmsvc_users++;
+ mutex_unlock(&nlmsvc_mutex);
+ return error;
+}
+EXPORT_SYMBOL_GPL(lockd_up);
+
+/*
+ * Decrement the user count and bring down lockd if we're the last.
+ */
+void
+lockd_down(void)
+{
+ mutex_lock(&nlmsvc_mutex);
+ if (nlmsvc_users) {
+ if (--nlmsvc_users)
+ goto out;
+ } else {
+ printk(KERN_ERR "lockd_down: no users! task=%p\n",
+ nlmsvc_task);
+ BUG();
+ }
+
+ if (!nlmsvc_task) {
+ printk(KERN_ERR "lockd_down: no lockd running.\n");
+ BUG();
+ }
+ kthread_stop(nlmsvc_task);
+ svc_exit_thread(nlmsvc_rqst);
+ nlmsvc_task = NULL;
+ nlmsvc_rqst = NULL;
+out:
+ mutex_unlock(&nlmsvc_mutex);
+}
+EXPORT_SYMBOL_GPL(lockd_down);
+
+#ifdef CONFIG_SYSCTL
+
+/*
+ * Sysctl parameters (same as module parameters, different interface).
+ */
+
+static ctl_table nlm_sysctls[] = {
+ {
+ .procname = "nlm_grace_period",
+ .data = &nlm_grace_period,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = (unsigned long *) &nlm_grace_period_min,
+ .extra2 = (unsigned long *) &nlm_grace_period_max,
+ },
+ {
+ .procname = "nlm_timeout",
+ .data = &nlm_timeout,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = (unsigned long *) &nlm_timeout_min,
+ .extra2 = (unsigned long *) &nlm_timeout_max,
+ },
+ {
+ .procname = "nlm_udpport",
+ .data = &nlm_udpport,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (int *) &nlm_port_min,
+ .extra2 = (int *) &nlm_port_max,
+ },
+ {
+ .procname = "nlm_tcpport",
+ .data = &nlm_tcpport,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (int *) &nlm_port_min,
+ .extra2 = (int *) &nlm_port_max,
+ },
+ {
+ .procname = "nsm_use_hostnames",
+ .data = &nsm_use_hostnames,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "nsm_local_state",
+ .data = &nsm_local_state,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static ctl_table nlm_sysctl_dir[] = {
+ {
+ .procname = "nfs",
+ .mode = 0555,
+ .child = nlm_sysctls,
+ },
+ { }
+};
+
+static ctl_table nlm_sysctl_root[] = {
+ {
+ .procname = "fs",
+ .mode = 0555,
+ .child = nlm_sysctl_dir,
+ },
+ { }
+};
+
+#endif /* CONFIG_SYSCTL */
+
+/*
+ * Module (and sysfs) parameters.
+ */
+
+#define param_set_min_max(name, type, which_strtol, min, max) \
+static int param_set_##name(const char *val, struct kernel_param *kp) \
+{ \
+ char *endp; \
+ __typeof__(type) num = which_strtol(val, &endp, 0); \
+ if (endp == val || *endp || num < (min) || num > (max)) \
+ return -EINVAL; \
+ *((type *) kp->arg) = num; \
+ return 0; \
+}
+
+static inline int is_callback(u32 proc)
+{
+ return proc == NLMPROC_GRANTED
+ || proc == NLMPROC_GRANTED_MSG
+ || proc == NLMPROC_TEST_RES
+ || proc == NLMPROC_LOCK_RES
+ || proc == NLMPROC_CANCEL_RES
+ || proc == NLMPROC_UNLOCK_RES
+ || proc == NLMPROC_NSM_NOTIFY;
+}
+
+
+static int lockd_authenticate(struct svc_rqst *rqstp)
+{
+ rqstp->rq_client = NULL;
+ switch (rqstp->rq_authop->flavour) {
+ case RPC_AUTH_NULL:
+ case RPC_AUTH_UNIX:
+ if (rqstp->rq_proc == 0)
+ return SVC_OK;
+ if (is_callback(rqstp->rq_proc)) {
+ /* Leave it to individual procedures to
+ * call nlmsvc_lookup_host(rqstp)
+ */
+ return SVC_OK;
+ }
+ return svc_set_client(rqstp);
+ }
+ return SVC_DENIED;
+}
+
+
+param_set_min_max(port, int, simple_strtol, 0, 65535)
+param_set_min_max(grace_period, unsigned long, simple_strtoul,
+ nlm_grace_period_min, nlm_grace_period_max)
+param_set_min_max(timeout, unsigned long, simple_strtoul,
+ nlm_timeout_min, nlm_timeout_max)
+
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
+MODULE_LICENSE("GPL");
+
+module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
+ &nlm_grace_period, 0644);
+module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
+ &nlm_timeout, 0644);
+module_param_call(nlm_udpport, param_set_port, param_get_int,
+ &nlm_udpport, 0644);
+module_param_call(nlm_tcpport, param_set_port, param_get_int,
+ &nlm_tcpport, 0644);
+module_param(nsm_use_hostnames, bool, 0644);
+module_param(nlm_max_connections, uint, 0644);
+
+/*
+ * Initialising and terminating the module.
+ */
+
+static int __init init_nlm(void)
+{
+#ifdef CONFIG_SYSCTL
+ nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
+ return nlm_sysctl_table ? 0 : -ENOMEM;
+#else
+ return 0;
+#endif
+}
+
+static void __exit exit_nlm(void)
+{
+ /* FIXME: delete all NLM clients */
+ nlm_shutdown_hosts();
+#ifdef CONFIG_SYSCTL
+ unregister_sysctl_table(nlm_sysctl_table);
+#endif
+}
+
+module_init(init_nlm);
+module_exit(exit_nlm);
+
+/*
+ * Define NLM program and procedures
+ */
+static struct svc_version nlmsvc_version1 = {
+ .vs_vers = 1,
+ .vs_nproc = 17,
+ .vs_proc = nlmsvc_procedures,
+ .vs_xdrsize = NLMSVC_XDRSIZE,
+};
+static struct svc_version nlmsvc_version3 = {
+ .vs_vers = 3,
+ .vs_nproc = 24,
+ .vs_proc = nlmsvc_procedures,
+ .vs_xdrsize = NLMSVC_XDRSIZE,
+};
+#ifdef CONFIG_LOCKD_V4
+static struct svc_version nlmsvc_version4 = {
+ .vs_vers = 4,
+ .vs_nproc = 24,
+ .vs_proc = nlmsvc_procedures4,
+ .vs_xdrsize = NLMSVC_XDRSIZE,
+};
+#endif
+static struct svc_version * nlmsvc_version[] = {
+ [1] = &nlmsvc_version1,
+ [3] = &nlmsvc_version3,
+#ifdef CONFIG_LOCKD_V4
+ [4] = &nlmsvc_version4,
+#endif
+};
+
+static struct svc_stat nlmsvc_stats;
+
+#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
+static struct svc_program nlmsvc_program = {
+ .pg_prog = NLM_PROGRAM, /* program number */
+ .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
+ .pg_vers = nlmsvc_version, /* version table */
+ .pg_name = "lockd", /* service name */
+ .pg_class = "nfsd", /* share authentication with nfsd */
+ .pg_stats = &nlmsvc_stats, /* stats table */
+ .pg_authenticate = &lockd_authenticate /* export authentication */
+};