diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/lockd/svc.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/lockd/svc.c | 663 |
1 files changed, 0 insertions, 663 deletions
diff --git a/ANDROID_3.4.5/fs/lockd/svc.c b/ANDROID_3.4.5/fs/lockd/svc.c deleted file mode 100644 index 3250f280..00000000 --- a/ANDROID_3.4.5/fs/lockd/svc.c +++ /dev/null @@ -1,663 +0,0 @@ -/* - * 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> - -#include "netns.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; - -int lockd_net_id; - -/* - * 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, - struct net *net, const int family, - const unsigned short port) -{ - struct svc_xprt *xprt; - - xprt = svc_find_xprt(serv, name, net, family, 0); - if (xprt == NULL) - return svc_create_xprt(serv, name, net, family, port, - SVC_SOCK_DEFAULTS); - svc_xprt_put(xprt); - return 0; -} - -static int create_lockd_family(struct svc_serv *serv, struct net *net, - const int family) -{ - int err; - - err = create_lockd_listener(serv, "udp", net, family, nlm_udpport); - if (err < 0) - return err; - - return create_lockd_listener(serv, "tcp", net, 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, struct net *net) -{ - static int warned; - int err; - - err = create_lockd_family(serv, net, PF_INET); - if (err < 0) - goto out_err; - - err = create_lockd_family(serv, net, 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; -} - -static int lockd_up_net(struct net *net) -{ - struct lockd_net *ln = net_generic(net, lockd_net_id); - struct svc_serv *serv = nlmsvc_rqst->rq_server; - int error; - - if (ln->nlmsvc_users++) - return 0; - - error = svc_rpcb_setup(serv, net); - if (error) - goto err_rpcb; - - error = make_socks(serv, net); - if (error < 0) - goto err_socks; - return 0; - -err_socks: - svc_rpcb_cleanup(serv, net); -err_rpcb: - ln->nlmsvc_users--; - return error; -} - -static void lockd_down_net(struct net *net) -{ - struct lockd_net *ln = net_generic(net, lockd_net_id); - struct svc_serv *serv = nlmsvc_rqst->rq_server; - - if (ln->nlmsvc_users) { - if (--ln->nlmsvc_users == 0) { - nlm_shutdown_hosts_net(net); - svc_shutdown_net(serv, net); - } - } else { - printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n", - nlmsvc_task, net); - BUG(); - } -} - -/* - * Bring up the lockd process if it's not already up. - */ -int lockd_up(struct net *net) -{ - struct svc_serv *serv; - int error = 0; - struct lockd_net *ln = net_generic(net, lockd_net_id); - - mutex_lock(&nlmsvc_mutex); - /* - * Check whether we're already up and running. - */ - if (nlmsvc_rqst) { - error = lockd_up_net(net); - 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 = svc_bind(serv, net); - if (error < 0) { - printk(KERN_WARNING "lockd_up: bind service failed\n"); - goto destroy_and_out; - } - - ln->nlmsvc_users++; - - error = make_socks(serv, net); - if (error < 0) - goto err_start; - - /* - * 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 err_start; - } - - 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 err_start; - } - - /* - * 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; - -err_start: - lockd_down_net(net); - goto destroy_and_out; -} -EXPORT_SYMBOL_GPL(lockd_up); - -/* - * Decrement the user count and bring down lockd if we're the last. - */ -void -lockd_down(struct net *net) -{ - mutex_lock(&nlmsvc_mutex); - lockd_down_net(net); - 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); - -static int lockd_init_net(struct net *net) -{ - return 0; -} - -static void lockd_exit_net(struct net *net) -{ -} - -static struct pernet_operations lockd_net_ops = { - .init = lockd_init_net, - .exit = lockd_exit_net, - .id = &lockd_net_id, - .size = sizeof(struct lockd_net), -}; - - -/* - * Initialising and terminating the module. - */ - -static int __init init_nlm(void) -{ - int err; - -#ifdef CONFIG_SYSCTL - err = -ENOMEM; - nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root); - if (nlm_sysctl_table == NULL) - goto err_sysctl; -#endif - err = register_pernet_subsys(&lockd_net_ops); - if (err) - goto err_pernet; - return 0; - -err_pernet: -#ifdef CONFIG_SYSCTL - unregister_sysctl_table(nlm_sysctl_table); -#endif -err_sysctl: - return err; -} - -static void __exit exit_nlm(void) -{ - /* FIXME: delete all NLM clients */ - nlm_shutdown_hosts(); - unregister_pernet_subsys(&lockd_net_ops); -#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 */ -}; 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