diff options
Diffstat (limited to 'net/sunrpc/clnt.c')
| -rw-r--r-- | net/sunrpc/clnt.c | 2400 |
1 files changed, 1803 insertions, 597 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 702ede309b0..2e6ab10734f 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -13,35 +13,47 @@ * and need to be refreshed, or when a packet was damaged in transit. * This may be have to be moved to the VFS layer. * - * NB: BSD uses a more intelligent approach to guessing when a request - * or reply has been lost by keeping the RTO estimate for each procedure. - * We currently make do with a constant timeout value. - * * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> */ -#include <asm/system.h> #include <linux/module.h> #include <linux/types.h> +#include <linux/kallsyms.h> #include <linux/mm.h> +#include <linux/namei.h> +#include <linux/mount.h> #include <linux/slab.h> +#include <linux/rcupdate.h> #include <linux/utsname.h> +#include <linux/workqueue.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/un.h> #include <linux/sunrpc/clnt.h> -#include <linux/workqueue.h> +#include <linux/sunrpc/addr.h> #include <linux/sunrpc/rpc_pipe_fs.h> +#include <linux/sunrpc/metrics.h> +#include <linux/sunrpc/bc_xprt.h> +#include <trace/events/sunrpc.h> -#include <linux/nfs.h> - - -#define RPC_SLACK_SPACE (1024) /* total overkill */ +#include "sunrpc.h" +#include "netns.h" #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_CALL #endif +#define dprint_status(t) \ + dprintk("RPC: %5u %s (status %d)\n", t->tk_pid, \ + __func__, t->tk_status) + +/* + * All RPC clients are linked into this list + */ + static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); @@ -49,480 +61,1259 @@ static void call_start(struct rpc_task *task); static void call_reserve(struct rpc_task *task); static void call_reserveresult(struct rpc_task *task); static void call_allocate(struct rpc_task *task); -static void call_encode(struct rpc_task *task); static void call_decode(struct rpc_task *task); static void call_bind(struct rpc_task *task); static void call_bind_status(struct rpc_task *task); static void call_transmit(struct rpc_task *task); +#if defined(CONFIG_SUNRPC_BACKCHANNEL) +static void call_bc_transmit(struct rpc_task *task); +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ static void call_status(struct rpc_task *task); +static void call_transmit_status(struct rpc_task *task); static void call_refresh(struct rpc_task *task); static void call_refreshresult(struct rpc_task *task); static void call_timeout(struct rpc_task *task); static void call_connect(struct rpc_task *task); static void call_connect_status(struct rpc_task *task); -static u32 * call_header(struct rpc_task *task); -static u32 * call_verify(struct rpc_task *task); +static __be32 *rpc_encode_header(struct rpc_task *task); +static __be32 *rpc_verify_header(struct rpc_task *task); +static int rpc_ping(struct rpc_clnt *clnt); -static int -rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name) +static void rpc_register_client(struct rpc_clnt *clnt) { - static uint32_t clntid; - int error; + struct net *net = rpc_net_ns(clnt); + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); - if (dir_name == NULL) - return 0; + spin_lock(&sn->rpc_client_lock); + list_add(&clnt->cl_clients, &sn->all_clients); + spin_unlock(&sn->rpc_client_lock); +} + +static void rpc_unregister_client(struct rpc_clnt *clnt) +{ + struct net *net = rpc_net_ns(clnt); + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + + spin_lock(&sn->rpc_client_lock); + list_del(&clnt->cl_clients); + spin_unlock(&sn->rpc_client_lock); +} + +static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) +{ + rpc_remove_client_dir(clnt); +} + +static void rpc_clnt_remove_pipedir(struct rpc_clnt *clnt) +{ + struct net *net = rpc_net_ns(clnt); + struct super_block *pipefs_sb; + + pipefs_sb = rpc_get_sb_net(net); + if (pipefs_sb) { + __rpc_clnt_remove_pipedir(clnt); + rpc_put_sb_net(net); + } +} + +static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, + struct rpc_clnt *clnt) +{ + static uint32_t clntid; + const char *dir_name = clnt->cl_program->pipe_dir_name; + char name[15]; + struct dentry *dir, *dentry; + + dir = rpc_d_lookup_sb(sb, dir_name); + if (dir == NULL) { + pr_info("RPC: pipefs directory doesn't exist: %s\n", dir_name); + return dir; + } for (;;) { - snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname), - "%s/clnt%x", dir_name, - (unsigned int)clntid++); - clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0'; - clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt); - if (!IS_ERR(clnt->cl_dentry)) - return 0; - error = PTR_ERR(clnt->cl_dentry); - if (error != -EEXIST) { - printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n", - clnt->cl_pathname, error); - return error; - } + snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++); + name[sizeof(name) - 1] = '\0'; + dentry = rpc_create_client_dir(dir, name, clnt); + if (!IS_ERR(dentry)) + break; + if (dentry == ERR_PTR(-EEXIST)) + continue; + printk(KERN_INFO "RPC: Couldn't create pipefs entry" + " %s/%s, error %ld\n", + dir_name, name, PTR_ERR(dentry)); + break; } + dput(dir); + return dentry; } -/* - * Create an RPC client - * FIXME: This should also take a flags argument (as in task->tk_flags). - * It's called (among others) from pmap_create_client, which may in - * turn be called by an async task. In this case, rpciod should not be - * made to sleep too long. - */ -struct rpc_clnt * -rpc_new_client(struct rpc_xprt *xprt, char *servname, - struct rpc_program *program, u32 vers, - rpc_authflavor_t flavor) +static int +rpc_setup_pipedir(struct super_block *pipefs_sb, struct rpc_clnt *clnt) +{ + struct dentry *dentry; + + if (clnt->cl_program->pipe_dir_name != NULL) { + dentry = rpc_setup_pipedir_sb(pipefs_sb, clnt); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + } + return 0; +} + +static int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event) +{ + if (clnt->cl_program->pipe_dir_name == NULL) + return 1; + + switch (event) { + case RPC_PIPEFS_MOUNT: + if (clnt->cl_pipedir_objects.pdh_dentry != NULL) + return 1; + if (atomic_read(&clnt->cl_count) == 0) + return 1; + break; + case RPC_PIPEFS_UMOUNT: + if (clnt->cl_pipedir_objects.pdh_dentry == NULL) + return 1; + break; + } + return 0; +} + +static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event, + struct super_block *sb) +{ + struct dentry *dentry; + int err = 0; + + switch (event) { + case RPC_PIPEFS_MOUNT: + dentry = rpc_setup_pipedir_sb(sb, clnt); + if (!dentry) + return -ENOENT; + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + break; + case RPC_PIPEFS_UMOUNT: + __rpc_clnt_remove_pipedir(clnt); + break; + default: + printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event); + return -ENOTSUPP; + } + return err; +} + +static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event, + struct super_block *sb) +{ + int error = 0; + + for (;; clnt = clnt->cl_parent) { + if (!rpc_clnt_skip_event(clnt, event)) + error = __rpc_clnt_handle_event(clnt, event, sb); + if (error || clnt == clnt->cl_parent) + break; + } + return error; +} + +static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) +{ + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + struct rpc_clnt *clnt; + + spin_lock(&sn->rpc_client_lock); + list_for_each_entry(clnt, &sn->all_clients, cl_clients) { + if (rpc_clnt_skip_event(clnt, event)) + continue; + spin_unlock(&sn->rpc_client_lock); + return clnt; + } + spin_unlock(&sn->rpc_client_lock); + return NULL; +} + +static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct super_block *sb = ptr; + struct rpc_clnt *clnt; + int error = 0; + + while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) { + error = __rpc_pipefs_event(clnt, event, sb); + if (error) + break; + } + return error; +} + +static struct notifier_block rpc_clients_block = { + .notifier_call = rpc_pipefs_event, + .priority = SUNRPC_PIPEFS_RPC_PRIO, +}; + +int rpc_clients_notifier_register(void) +{ + return rpc_pipefs_notifier_register(&rpc_clients_block); +} + +void rpc_clients_notifier_unregister(void) +{ + return rpc_pipefs_notifier_unregister(&rpc_clients_block); +} + +static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, + struct rpc_xprt *xprt, + const struct rpc_timeout *timeout) +{ + struct rpc_xprt *old; + + spin_lock(&clnt->cl_lock); + old = rcu_dereference_protected(clnt->cl_xprt, + lockdep_is_held(&clnt->cl_lock)); + + if (!xprt_bound(xprt)) + clnt->cl_autobind = 1; + + clnt->cl_timeout = timeout; + rcu_assign_pointer(clnt->cl_xprt, xprt); + spin_unlock(&clnt->cl_lock); + + return old; +} + +static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) +{ + clnt->cl_nodelen = strlen(nodename); + if (clnt->cl_nodelen > UNX_MAXNODENAME) + clnt->cl_nodelen = UNX_MAXNODENAME; + memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); +} + +static int rpc_client_register(struct rpc_clnt *clnt, + rpc_authflavor_t pseudoflavor, + const char *client_name) +{ + struct rpc_auth_create_args auth_args = { + .pseudoflavor = pseudoflavor, + .target_name = client_name, + }; + struct rpc_auth *auth; + struct net *net = rpc_net_ns(clnt); + struct super_block *pipefs_sb; + int err; + + pipefs_sb = rpc_get_sb_net(net); + if (pipefs_sb) { + err = rpc_setup_pipedir(pipefs_sb, clnt); + if (err) + goto out; + } + + rpc_register_client(clnt); + if (pipefs_sb) + rpc_put_sb_net(net); + + auth = rpcauth_create(&auth_args, clnt); + if (IS_ERR(auth)) { + dprintk("RPC: Couldn't create auth handle (flavor %u)\n", + pseudoflavor); + err = PTR_ERR(auth); + goto err_auth; + } + return 0; +err_auth: + pipefs_sb = rpc_get_sb_net(net); + rpc_unregister_client(clnt); + __rpc_clnt_remove_pipedir(clnt); +out: + if (pipefs_sb) + rpc_put_sb_net(net); + return err; +} + +static DEFINE_IDA(rpc_clids); + +static int rpc_alloc_clid(struct rpc_clnt *clnt) +{ + int clid; + + clid = ida_simple_get(&rpc_clids, 0, 0, GFP_KERNEL); + if (clid < 0) + return clid; + clnt->cl_clid = clid; + return 0; +} + +static void rpc_free_clid(struct rpc_clnt *clnt) +{ + ida_simple_remove(&rpc_clids, clnt->cl_clid); +} + +static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, + struct rpc_xprt *xprt, + struct rpc_clnt *parent) { - struct rpc_version *version; - struct rpc_clnt *clnt = NULL; - struct rpc_auth *auth; + const struct rpc_program *program = args->program; + const struct rpc_version *version; + struct rpc_clnt *clnt = NULL; + const struct rpc_timeout *timeout; int err; - int len; - dprintk("RPC: creating %s client for %s (xprt %p)\n", - program->name, servname, xprt); + /* sanity check the name before trying to print it */ + dprintk("RPC: creating %s client for %s (xprt %p)\n", + program->name, args->servername, xprt); + + err = rpciod_up(); + if (err) + goto out_no_rpciod; err = -EINVAL; - if (!xprt) + if (args->version >= program->nrvers) goto out_err; - if (vers >= program->nrvers || !(version = program->version[vers])) + version = program->version[args->version]; + if (version == NULL) goto out_err; err = -ENOMEM; - clnt = (struct rpc_clnt *) kmalloc(sizeof(*clnt), GFP_KERNEL); + clnt = kzalloc(sizeof(*clnt), GFP_KERNEL); if (!clnt) goto out_err; - memset(clnt, 0, sizeof(*clnt)); - atomic_set(&clnt->cl_users, 0); - atomic_set(&clnt->cl_count, 1); - clnt->cl_parent = clnt; + clnt->cl_parent = parent ? : clnt; - clnt->cl_server = clnt->cl_inline_name; - len = strlen(servname) + 1; - if (len > sizeof(clnt->cl_inline_name)) { - char *buf = kmalloc(len, GFP_KERNEL); - if (buf != 0) - clnt->cl_server = buf; - else - len = sizeof(clnt->cl_inline_name); - } - strlcpy(clnt->cl_server, servname, len); + err = rpc_alloc_clid(clnt); + if (err) + goto out_no_clid; - clnt->cl_xprt = xprt; clnt->cl_procinfo = version->procs; clnt->cl_maxproc = version->nrprocs; - clnt->cl_protname = program->name; - clnt->cl_pmap = &clnt->cl_pmap_default; - clnt->cl_port = xprt->addr.sin_port; - clnt->cl_prog = program->number; + clnt->cl_prog = args->prognumber ? : program->number; clnt->cl_vers = version->number; - clnt->cl_prot = xprt->prot; clnt->cl_stats = program->stats; - rpc_init_wait_queue(&clnt->cl_pmap_default.pm_bindwait, "bindwait"); + clnt->cl_metrics = rpc_alloc_iostats(clnt); + rpc_init_pipe_dir_head(&clnt->cl_pipedir_objects); + err = -ENOMEM; + if (clnt->cl_metrics == NULL) + goto out_no_stats; + clnt->cl_program = program; + INIT_LIST_HEAD(&clnt->cl_tasks); + spin_lock_init(&clnt->cl_lock); + + timeout = xprt->timeout; + if (args->timeout != NULL) { + memcpy(&clnt->cl_timeout_default, args->timeout, + sizeof(clnt->cl_timeout_default)); + timeout = &clnt->cl_timeout_default; + } - if (!clnt->cl_port) - clnt->cl_autobind = 1; + rpc_clnt_set_transport(clnt, xprt, timeout); clnt->cl_rtt = &clnt->cl_rtt_default; - rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval); - - err = rpc_setup_pipedir(clnt, program->pipe_dir_name); - if (err < 0) - goto out_no_path; + rpc_init_rtt(&clnt->cl_rtt_default, clnt->cl_timeout->to_initval); - auth = rpcauth_create(flavor, clnt); - if (IS_ERR(auth)) { - printk(KERN_INFO "RPC: Couldn't create auth handle (flavor %u)\n", - flavor); - err = PTR_ERR(auth); - goto out_no_auth; - } + atomic_set(&clnt->cl_count, 1); /* save the nodename */ - clnt->cl_nodelen = strlen(system_utsname.nodename); - if (clnt->cl_nodelen > UNX_MAXNODENAME) - clnt->cl_nodelen = UNX_MAXNODENAME; - memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen); + rpc_clnt_set_nodename(clnt, utsname()->nodename); + + err = rpc_client_register(clnt, args->authflavor, args->client_name); + if (err) + goto out_no_path; + if (parent) + atomic_inc(&parent->cl_count); return clnt; -out_no_auth: - rpc_rmdir(clnt->cl_pathname); out_no_path: - if (clnt->cl_server != clnt->cl_inline_name) - kfree(clnt->cl_server); + rpc_free_iostats(clnt->cl_metrics); +out_no_stats: + rpc_free_clid(clnt); +out_no_clid: kfree(clnt); out_err: - xprt_destroy(xprt); + rpciod_down(); +out_no_rpciod: + xprt_put(xprt); return ERR_PTR(err); } +struct rpc_clnt *rpc_create_xprt(struct rpc_create_args *args, + struct rpc_xprt *xprt) +{ + struct rpc_clnt *clnt = NULL; + + clnt = rpc_new_client(args, xprt, NULL); + if (IS_ERR(clnt)) + return clnt; + + if (!(args->flags & RPC_CLNT_CREATE_NOPING)) { + int err = rpc_ping(clnt); + if (err != 0) { + rpc_shutdown_client(clnt); + return ERR_PTR(err); + } + } + + clnt->cl_softrtry = 1; + if (args->flags & RPC_CLNT_CREATE_HARDRTRY) + clnt->cl_softrtry = 0; + + if (args->flags & RPC_CLNT_CREATE_AUTOBIND) + clnt->cl_autobind = 1; + if (args->flags & RPC_CLNT_CREATE_DISCRTRY) + clnt->cl_discrtry = 1; + if (!(args->flags & RPC_CLNT_CREATE_QUIET)) + clnt->cl_chatty = 1; + + return clnt; +} +EXPORT_SYMBOL_GPL(rpc_create_xprt); + /** - * Create an RPC client - * @xprt - pointer to xprt struct - * @servname - name of server - * @info - rpc_program - * @version - rpc_program version - * @authflavor - rpc_auth flavour to use + * rpc_create - create an RPC client and transport with one call + * @args: rpc_clnt create argument structure * - * Creates an RPC client structure, then pings the server in order to - * determine if it is up, and if it supports this program and version. + * Creates and initializes an RPC transport and an RPC client. * - * This function should never be called by asynchronous tasks such as - * the portmapper. + * It can ping the server in order to determine if it is up, and to see if + * it supports this program and version. RPC_CLNT_CREATE_NOPING disables + * this behavior so asynchronous tasks can also use rpc_create. */ -struct rpc_clnt *rpc_create_client(struct rpc_xprt *xprt, char *servname, - struct rpc_program *info, u32 version, rpc_authflavor_t authflavor) +struct rpc_clnt *rpc_create(struct rpc_create_args *args) { - struct rpc_clnt *clnt; - int err; - - clnt = rpc_new_client(xprt, servname, info, version, authflavor); - if (IS_ERR(clnt)) - return clnt; - err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); - if (err == 0) - return clnt; - rpc_shutdown_client(clnt); - return ERR_PTR(err); + struct rpc_xprt *xprt; + struct xprt_create xprtargs = { + .net = args->net, + .ident = args->protocol, + .srcaddr = args->saddress, + .dstaddr = args->address, + .addrlen = args->addrsize, + .servername = args->servername, + .bc_xprt = args->bc_xprt, + }; + char servername[48]; + + if (args->flags & RPC_CLNT_CREATE_INFINITE_SLOTS) + xprtargs.flags |= XPRT_CREATE_INFINITE_SLOTS; + if (args->flags & RPC_CLNT_CREATE_NO_IDLE_TIMEOUT) + xprtargs.flags |= XPRT_CREATE_NO_IDLE_TIMEOUT; + /* + * If the caller chooses not to specify a hostname, whip + * up a string representation of the passed-in address. + */ + if (xprtargs.servername == NULL) { + struct sockaddr_un *sun = + (struct sockaddr_un *)args->address; + struct sockaddr_in *sin = + (struct sockaddr_in *)args->address; + struct sockaddr_in6 *sin6 = + (struct sockaddr_in6 *)args->address; + + servername[0] = '\0'; + switch (args->address->sa_family) { + case AF_LOCAL: + snprintf(servername, sizeof(servername), "%s", + sun->sun_path); + break; + case AF_INET: + snprintf(servername, sizeof(servername), "%pI4", + &sin->sin_addr.s_addr); + break; + case AF_INET6: + snprintf(servername, sizeof(servername), "%pI6", + &sin6->sin6_addr); + break; + default: + /* caller wants default server name, but + * address family isn't recognized. */ + return ERR_PTR(-EINVAL); + } + xprtargs.servername = servername; + } + + xprt = xprt_create_transport(&xprtargs); + if (IS_ERR(xprt)) + return (struct rpc_clnt *)xprt; + + /* + * By default, kernel RPC client connects from a reserved port. + * CAP_NET_BIND_SERVICE will not be set for unprivileged requesters, + * but it is always enabled for rpciod, which handles the connect + * operation. + */ + xprt->resvport = 1; + if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT) + xprt->resvport = 0; + + return rpc_create_xprt(args, xprt); } +EXPORT_SYMBOL_GPL(rpc_create); /* * This function clones the RPC client structure. It allows us to share the * same transport while varying parameters such as the authentication * flavour. */ -struct rpc_clnt * -rpc_clone_client(struct rpc_clnt *clnt) +static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, + struct rpc_clnt *clnt) { + struct rpc_xprt *xprt; struct rpc_clnt *new; + int err; + + err = -ENOMEM; + rcu_read_lock(); + xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); + rcu_read_unlock(); + if (xprt == NULL) + goto out_err; + args->servername = xprt->servername; + + new = rpc_new_client(args, xprt, clnt); + if (IS_ERR(new)) { + err = PTR_ERR(new); + goto out_err; + } - new = (struct rpc_clnt *)kmalloc(sizeof(*new), GFP_KERNEL); - if (!new) - goto out_no_clnt; - memcpy(new, clnt, sizeof(*new)); - atomic_set(&new->cl_count, 1); - atomic_set(&new->cl_users, 0); - new->cl_parent = clnt; - atomic_inc(&clnt->cl_count); - /* Duplicate portmapper */ - rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); /* Turn off autobind on clones */ new->cl_autobind = 0; - new->cl_oneshot = 0; - new->cl_dead = 0; - rpc_init_rtt(&new->cl_rtt_default, clnt->cl_xprt->timeout.to_initval); - if (new->cl_auth) - atomic_inc(&new->cl_auth->au_count); - new->cl_pmap = &new->cl_pmap_default; - rpc_init_wait_queue(&new->cl_pmap_default.pm_bindwait, "bindwait"); + new->cl_softrtry = clnt->cl_softrtry; + new->cl_discrtry = clnt->cl_discrtry; + new->cl_chatty = clnt->cl_chatty; return new; -out_no_clnt: - printk(KERN_INFO "RPC: out of memory in %s\n", __FUNCTION__); - return ERR_PTR(-ENOMEM); + +out_err: + dprintk("RPC: %s: returned error %d\n", __func__, err); + return ERR_PTR(err); +} + +/** + * rpc_clone_client - Clone an RPC client structure + * + * @clnt: RPC client whose parameters are copied + * + * Returns a fresh RPC client or an ERR_PTR. + */ +struct rpc_clnt *rpc_clone_client(struct rpc_clnt *clnt) +{ + struct rpc_create_args args = { + .program = clnt->cl_program, + .prognumber = clnt->cl_prog, + .version = clnt->cl_vers, + .authflavor = clnt->cl_auth->au_flavor, + }; + return __rpc_clone_client(&args, clnt); +} +EXPORT_SYMBOL_GPL(rpc_clone_client); + +/** + * rpc_clone_client_set_auth - Clone an RPC client structure and set its auth + * + * @clnt: RPC client whose parameters are copied + * @flavor: security flavor for new client + * + * Returns a fresh RPC client or an ERR_PTR. + */ +struct rpc_clnt * +rpc_clone_client_set_auth(struct rpc_clnt *clnt, rpc_authflavor_t flavor) +{ + struct rpc_create_args args = { + .program = clnt->cl_program, + .prognumber = clnt->cl_prog, + .version = clnt->cl_vers, + .authflavor = flavor, + }; + return __rpc_clone_client(&args, clnt); } +EXPORT_SYMBOL_GPL(rpc_clone_client_set_auth); + +/** + * rpc_switch_client_transport: switch the RPC transport on the fly + * @clnt: pointer to a struct rpc_clnt + * @args: pointer to the new transport arguments + * @timeout: pointer to the new timeout parameters + * + * This function allows the caller to switch the RPC transport for the + * rpc_clnt structure 'clnt' to allow it to connect to a mirrored NFS + * server, for instance. It assumes that the caller has ensured that + * there are no active RPC tasks by using some form of locking. + * + * Returns zero if "clnt" is now using the new xprt. Otherwise a + * negative errno is returned, and "clnt" continues to use the old + * xprt. + */ +int rpc_switch_client_transport(struct rpc_clnt *clnt, + struct xprt_create *args, + const struct rpc_timeout *timeout) +{ + const struct rpc_timeout *old_timeo; + rpc_authflavor_t pseudoflavor; + struct rpc_xprt *xprt, *old; + struct rpc_clnt *parent; + int err; + + xprt = xprt_create_transport(args); + if (IS_ERR(xprt)) { + dprintk("RPC: failed to create new xprt for clnt %p\n", + clnt); + return PTR_ERR(xprt); + } + + pseudoflavor = clnt->cl_auth->au_flavor; + + old_timeo = clnt->cl_timeout; + old = rpc_clnt_set_transport(clnt, xprt, timeout); + + rpc_unregister_client(clnt); + __rpc_clnt_remove_pipedir(clnt); + + /* + * A new transport was created. "clnt" therefore + * becomes the root of a new cl_parent tree. clnt's + * children, if it has any, still point to the old xprt. + */ + parent = clnt->cl_parent; + clnt->cl_parent = clnt; + + /* + * The old rpc_auth cache cannot be re-used. GSS + * contexts in particular are between a single + * client and server. + */ + err = rpc_client_register(clnt, pseudoflavor, NULL); + if (err) + goto out_revert; + + synchronize_rcu(); + if (parent != clnt) + rpc_release_client(parent); + xprt_put(old); + dprintk("RPC: replaced xprt for clnt %p\n", clnt); + return 0; + +out_revert: + rpc_clnt_set_transport(clnt, old, old_timeo); + clnt->cl_parent = parent; + rpc_client_register(clnt, pseudoflavor, NULL); + xprt_put(xprt); + dprintk("RPC: failed to switch xprt for clnt %p\n", clnt); + return err; +} +EXPORT_SYMBOL_GPL(rpc_switch_client_transport); /* - * Properly shut down an RPC client, terminating all outstanding - * requests. Note that we must be certain that cl_oneshot and - * cl_dead are cleared, or else the client would be destroyed - * when the last task releases it. + * Kill all tasks for the given client. + * XXX: kill their descendants as well? */ -int -rpc_shutdown_client(struct rpc_clnt *clnt) +void rpc_killall_tasks(struct rpc_clnt *clnt) { - dprintk("RPC: shutting down %s client for %s, tasks=%d\n", - clnt->cl_protname, clnt->cl_server, - atomic_read(&clnt->cl_users)); + struct rpc_task *rovr; - while (atomic_read(&clnt->cl_users) > 0) { - /* Don't let rpc_release_client destroy us */ - clnt->cl_oneshot = 0; - clnt->cl_dead = 0; - rpc_killall_tasks(clnt); - sleep_on_timeout(&destroy_wait, 1*HZ); + + if (list_empty(&clnt->cl_tasks)) + return; + dprintk("RPC: killing all tasks for client %p\n", clnt); + /* + * Spin lock all_tasks to prevent changes... + */ + spin_lock(&clnt->cl_lock); + list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { + if (!RPC_IS_ACTIVATED(rovr)) + continue; + if (!(rovr->tk_flags & RPC_TASK_KILLED)) { + rovr->tk_flags |= RPC_TASK_KILLED; + rpc_exit(rovr, -EIO); + if (RPC_IS_QUEUED(rovr)) + rpc_wake_up_queued_task(rovr->tk_waitqueue, + rovr); + } } + spin_unlock(&clnt->cl_lock); +} +EXPORT_SYMBOL_GPL(rpc_killall_tasks); - if (atomic_read(&clnt->cl_users) < 0) { - printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n", - clnt, atomic_read(&clnt->cl_users)); -#ifdef RPC_DEBUG - rpc_show_tasks(); -#endif - BUG(); +/* + * Properly shut down an RPC client, terminating all outstanding + * requests. + */ +void rpc_shutdown_client(struct rpc_clnt *clnt) +{ + might_sleep(); + + dprintk_rcu("RPC: shutting down %s client for %s\n", + clnt->cl_program->name, + rcu_dereference(clnt->cl_xprt)->servername); + + while (!list_empty(&clnt->cl_tasks)) { + rpc_killall_tasks(clnt); + wait_event_timeout(destroy_wait, + list_empty(&clnt->cl_tasks), 1*HZ); } - return rpc_destroy_client(clnt); + rpc_release_client(clnt); } +EXPORT_SYMBOL_GPL(rpc_shutdown_client); /* - * Delete an RPC client + * Free an RPC client */ -int -rpc_destroy_client(struct rpc_clnt *clnt) +static struct rpc_clnt * +rpc_free_client(struct rpc_clnt *clnt) { - if (!atomic_dec_and_test(&clnt->cl_count)) - return 1; - BUG_ON(atomic_read(&clnt->cl_users) != 0); - - dprintk("RPC: destroying %s client for %s\n", - clnt->cl_protname, clnt->cl_server); - if (clnt->cl_auth) { - rpcauth_destroy(clnt->cl_auth); - clnt->cl_auth = NULL; - } - if (clnt->cl_parent != clnt) { - rpc_destroy_client(clnt->cl_parent); - goto out_free; - } - if (clnt->cl_pathname[0]) - rpc_rmdir(clnt->cl_pathname); - if (clnt->cl_xprt) { - xprt_destroy(clnt->cl_xprt); - clnt->cl_xprt = NULL; - } - if (clnt->cl_server != clnt->cl_inline_name) - kfree(clnt->cl_server); -out_free: + struct rpc_clnt *parent = NULL; + + dprintk_rcu("RPC: destroying %s client for %s\n", + clnt->cl_program->name, + rcu_dereference(clnt->cl_xprt)->servername); + if (clnt->cl_parent != clnt) + parent = clnt->cl_parent; + rpc_clnt_remove_pipedir(clnt); + rpc_unregister_client(clnt); + rpc_free_iostats(clnt->cl_metrics); + clnt->cl_metrics = NULL; + xprt_put(rcu_dereference_raw(clnt->cl_xprt)); + rpciod_down(); + rpc_free_clid(clnt); kfree(clnt); - return 0; + return parent; } /* - * Release an RPC client + * Free an RPC client + */ +static struct rpc_clnt * +rpc_free_auth(struct rpc_clnt *clnt) +{ + if (clnt->cl_auth == NULL) + return rpc_free_client(clnt); + + /* + * Note: RPCSEC_GSS may need to send NULL RPC calls in order to + * release remaining GSS contexts. This mechanism ensures + * that it can do so safely. + */ + atomic_inc(&clnt->cl_count); + rpcauth_release(clnt->cl_auth); + clnt->cl_auth = NULL; + if (atomic_dec_and_test(&clnt->cl_count)) + return rpc_free_client(clnt); + return NULL; +} + +/* + * Release reference to the RPC client */ void rpc_release_client(struct rpc_clnt *clnt) { - dprintk("RPC: rpc_release_client(%p, %d)\n", - clnt, atomic_read(&clnt->cl_users)); + dprintk("RPC: rpc_release_client(%p)\n", clnt); - if (!atomic_dec_and_test(&clnt->cl_users)) - return; - wake_up(&destroy_wait); - if (clnt->cl_oneshot || clnt->cl_dead) - rpc_destroy_client(clnt); + do { + if (list_empty(&clnt->cl_tasks)) + wake_up(&destroy_wait); + if (!atomic_dec_and_test(&clnt->cl_count)) + break; + clnt = rpc_free_auth(clnt); + } while (clnt != NULL); } +EXPORT_SYMBOL_GPL(rpc_release_client); /** * rpc_bind_new_program - bind a new RPC program to an existing client - * @old - old rpc_client - * @program - rpc program to set - * @vers - rpc program version + * @old: old rpc_client + * @program: rpc program to set + * @vers: rpc program version * * Clones the rpc client and sets up a new RPC program. This is mainly * of use for enabling different RPC programs to share the same transport. * The Sun NFSv2/v3 ACL protocol can do this. */ struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *old, - struct rpc_program *program, - int vers) + const struct rpc_program *program, + u32 vers) { + struct rpc_create_args args = { + .program = program, + .prognumber = program->number, + .version = vers, + .authflavor = old->cl_auth->au_flavor, + }; struct rpc_clnt *clnt; - struct rpc_version *version; int err; - BUG_ON(vers >= program->nrvers || !program->version[vers]); - version = program->version[vers]; - clnt = rpc_clone_client(old); + clnt = __rpc_clone_client(&args, old); if (IS_ERR(clnt)) goto out; - clnt->cl_procinfo = version->procs; - clnt->cl_maxproc = version->nrprocs; - clnt->cl_protname = program->name; - clnt->cl_prog = program->number; - clnt->cl_vers = version->number; - clnt->cl_stats = program->stats; - err = rpc_ping(clnt, RPC_TASK_SOFT|RPC_TASK_NOINTR); + err = rpc_ping(clnt); if (err != 0) { rpc_shutdown_client(clnt); clnt = ERR_PTR(err); } -out: +out: return clnt; } +EXPORT_SYMBOL_GPL(rpc_bind_new_program); + +void rpc_task_release_client(struct rpc_task *task) +{ + struct rpc_clnt *clnt = task->tk_client; + + if (clnt != NULL) { + /* Remove from client task list */ + spin_lock(&clnt->cl_lock); + list_del(&task->tk_task); + spin_unlock(&clnt->cl_lock); + task->tk_client = NULL; + + rpc_release_client(clnt); + } +} + +static +void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt) +{ + if (clnt != NULL) { + rpc_task_release_client(task); + task->tk_client = clnt; + atomic_inc(&clnt->cl_count); + if (clnt->cl_softrtry) + task->tk_flags |= RPC_TASK_SOFT; + if (clnt->cl_noretranstimeo) + task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT; + if (sk_memalloc_socks()) { + struct rpc_xprt *xprt; + + rcu_read_lock(); + xprt = rcu_dereference(clnt->cl_xprt); + if (xprt->swapper) + task->tk_flags |= RPC_TASK_SWAPPER; + rcu_read_unlock(); + } + /* Add to the client's list of all tasks */ + spin_lock(&clnt->cl_lock); + list_add_tail(&task->tk_task, &clnt->cl_tasks); + spin_unlock(&clnt->cl_lock); + } +} + +void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt) +{ + rpc_task_release_client(task); + rpc_task_set_client(task, clnt); +} +EXPORT_SYMBOL_GPL(rpc_task_reset_client); + + +static void +rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg) +{ + if (msg != NULL) { + task->tk_msg.rpc_proc = msg->rpc_proc; + task->tk_msg.rpc_argp = msg->rpc_argp; + task->tk_msg.rpc_resp = msg->rpc_resp; + if (msg->rpc_cred != NULL) + task->tk_msg.rpc_cred = get_rpccred(msg->rpc_cred); + } +} /* * Default callback for async RPC calls */ static void -rpc_default_callback(struct rpc_task *task) +rpc_default_callback(struct rpc_task *task, void *data) { } -/* - * Export the signal mask handling for synchronous code that - * sleeps on RPC calls +static const struct rpc_call_ops rpc_default_ops = { + .rpc_call_done = rpc_default_callback, +}; + +/** + * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it + * @task_setup_data: pointer to task initialisation data */ -#define RPC_INTR_SIGNALS (sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGKILL)) - -static void rpc_save_sigmask(sigset_t *oldset, int intr) +struct rpc_task *rpc_run_task(const struct rpc_task_setup *task_setup_data) { - unsigned long sigallow = 0; - sigset_t sigmask; + struct rpc_task *task; + + task = rpc_new_task(task_setup_data); + if (IS_ERR(task)) + goto out; - /* Block all signals except those listed in sigallow */ - if (intr) - sigallow |= RPC_INTR_SIGNALS; - siginitsetinv(&sigmask, sigallow); - sigprocmask(SIG_BLOCK, &sigmask, oldset); + rpc_task_set_client(task, task_setup_data->rpc_client); + rpc_task_set_rpc_message(task, task_setup_data->rpc_message); + + if (task->tk_action == NULL) + rpc_call_start(task); + + atomic_inc(&task->tk_count); + rpc_execute(task); +out: + return task; } +EXPORT_SYMBOL_GPL(rpc_run_task); -static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset) +/** + * rpc_call_sync - Perform a synchronous RPC call + * @clnt: pointer to RPC client + * @msg: RPC call parameters + * @flags: RPC call flags + */ +int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) { - rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task)); + struct rpc_task *task; + struct rpc_task_setup task_setup_data = { + .rpc_client = clnt, + .rpc_message = msg, + .callback_ops = &rpc_default_ops, + .flags = flags, + }; + int status; + + WARN_ON_ONCE(flags & RPC_TASK_ASYNC); + if (flags & RPC_TASK_ASYNC) { + rpc_release_calldata(task_setup_data.callback_ops, + task_setup_data.callback_data); + return -EINVAL; + } + + task = rpc_run_task(&task_setup_data); + if (IS_ERR(task)) + return PTR_ERR(task); + status = task->tk_status; + rpc_put_task(task); + return status; } +EXPORT_SYMBOL_GPL(rpc_call_sync); -static inline void rpc_restore_sigmask(sigset_t *oldset) +/** + * rpc_call_async - Perform an asynchronous RPC call + * @clnt: pointer to RPC client + * @msg: RPC call parameters + * @flags: RPC call flags + * @tk_ops: RPC call ops + * @data: user call data + */ +int +rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, + const struct rpc_call_ops *tk_ops, void *data) { - sigprocmask(SIG_SETMASK, oldset, NULL); + struct rpc_task *task; + struct rpc_task_setup task_setup_data = { + .rpc_client = clnt, + .rpc_message = msg, + .callback_ops = tk_ops, + .callback_data = data, + .flags = flags|RPC_TASK_ASYNC, + }; + + task = rpc_run_task(&task_setup_data); + if (IS_ERR(task)) + return PTR_ERR(task); + rpc_put_task(task); + return 0; } +EXPORT_SYMBOL_GPL(rpc_call_async); -void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) +#if defined(CONFIG_SUNRPC_BACKCHANNEL) +/** + * rpc_run_bc_task - Allocate a new RPC task for backchannel use, then run + * rpc_execute against it + * @req: RPC request + * @tk_ops: RPC call ops + */ +struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req, + const struct rpc_call_ops *tk_ops) { - rpc_save_sigmask(oldset, clnt->cl_intr); + struct rpc_task *task; + struct xdr_buf *xbufp = &req->rq_snd_buf; + struct rpc_task_setup task_setup_data = { + .callback_ops = tk_ops, + }; + + dprintk("RPC: rpc_run_bc_task req= %p\n", req); + /* + * Create an rpc_task to send the data + */ + task = rpc_new_task(&task_setup_data); + if (IS_ERR(task)) { + xprt_free_bc_request(req); + goto out; + } + task->tk_rqstp = req; + + /* + * Set up the xdr_buf length. + * This also indicates that the buffer is XDR encoded already. + */ + xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + + xbufp->tail[0].iov_len; + + task->tk_action = call_bc_transmit; + atomic_inc(&task->tk_count); + WARN_ON_ONCE(atomic_read(&task->tk_count) != 2); + rpc_execute(task); + +out: + dprintk("RPC: rpc_run_bc_task: task= %p\n", task); + return task; } +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ -void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) +void +rpc_call_start(struct rpc_task *task) { - rpc_restore_sigmask(oldset); + task->tk_action = call_start; } +EXPORT_SYMBOL_GPL(rpc_call_start); -/* - * New rpc_call implementation +/** + * rpc_peeraddr - extract remote peer address from clnt's xprt + * @clnt: RPC client structure + * @buf: target buffer + * @bufsize: length of target buffer + * + * Returns the number of bytes that are actually in the stored address. */ -int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) +size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize) { - struct rpc_task *task; - sigset_t oldset; - int status; + size_t bytes; + struct rpc_xprt *xprt; - /* If this client is slain all further I/O fails */ - if (clnt->cl_dead) - return -EIO; + rcu_read_lock(); + xprt = rcu_dereference(clnt->cl_xprt); - BUG_ON(flags & RPC_TASK_ASYNC); + bytes = xprt->addrlen; + if (bytes > bufsize) + bytes = bufsize; + memcpy(buf, &xprt->addr, bytes); + rcu_read_unlock(); - status = -ENOMEM; - task = rpc_new_task(clnt, NULL, flags); - if (task == NULL) - goto out; - - /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */ - rpc_task_sigmask(task, &oldset); + return bytes; +} +EXPORT_SYMBOL_GPL(rpc_peeraddr); - rpc_call_setup(task, msg, 0); +/** + * rpc_peeraddr2str - return remote peer address in printable format + * @clnt: RPC client structure + * @format: address format + * + * NB: the lifetime of the memory referenced by the returned pointer is + * the same as the rpc_xprt itself. As long as the caller uses this + * pointer, it must hold the RCU read lock. + */ +const char *rpc_peeraddr2str(struct rpc_clnt *clnt, + enum rpc_display_format_t format) +{ + struct rpc_xprt *xprt; - /* Set up the call info struct and execute the task */ - if (task->tk_status == 0) { - status = rpc_execute(task); - } else { - status = task->tk_status; - rpc_release_task(task); - } + xprt = rcu_dereference(clnt->cl_xprt); - rpc_restore_sigmask(&oldset); -out: - return status; + if (xprt->address_strings[format] != NULL) + return xprt->address_strings[format]; + else + return "unprintable"; } +EXPORT_SYMBOL_GPL(rpc_peeraddr2str); + +static const struct sockaddr_in rpc_inaddr_loopback = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), +}; + +static const struct sockaddr_in6 rpc_in6addr_loopback = { + .sin6_family = AF_INET6, + .sin6_addr = IN6ADDR_ANY_INIT, +}; /* - * New rpc_call implementation + * Try a getsockname() on a connected datagram socket. Using a + * connected datagram socket prevents leaving a socket in TIME_WAIT. + * This conserves the ephemeral port number space. + * + * Returns zero and fills in "buf" if successful; otherwise, a + * negative errno is returned. */ -int -rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, - rpc_action callback, void *data) +static int rpc_sockname(struct net *net, struct sockaddr *sap, size_t salen, + struct sockaddr *buf, int buflen) { - struct rpc_task *task; - sigset_t oldset; - int status; - - /* If this client is slain all further I/O fails */ - if (clnt->cl_dead) - return -EIO; + struct socket *sock; + int err; - flags |= RPC_TASK_ASYNC; + err = __sock_create(net, sap->sa_family, + SOCK_DGRAM, IPPROTO_UDP, &sock, 1); + if (err < 0) { + dprintk("RPC: can't create UDP socket (%d)\n", err); + goto out; + } - /* Create/initialize a new RPC task */ - if (!callback) - callback = rpc_default_callback; - status = -ENOMEM; - if (!(task = rpc_new_task(clnt, callback, flags))) + switch (sap->sa_family) { + case AF_INET: + err = kernel_bind(sock, + (struct sockaddr *)&rpc_inaddr_loopback, + sizeof(rpc_inaddr_loopback)); + break; + case AF_INET6: + err = kernel_bind(sock, + (struct sockaddr *)&rpc_in6addr_loopback, + sizeof(rpc_in6addr_loopback)); + break; + default: + err = -EAFNOSUPPORT; goto out; - task->tk_calldata = data; + } + if (err < 0) { + dprintk("RPC: can't bind UDP socket (%d)\n", err); + goto out_release; + } - /* Mask signals on GSS_AUTH upcalls */ - rpc_task_sigmask(task, &oldset); + err = kernel_connect(sock, sap, salen, 0); + if (err < 0) { + dprintk("RPC: can't connect UDP socket (%d)\n", err); + goto out_release; + } - rpc_call_setup(task, msg, 0); + err = kernel_getsockname(sock, buf, &buflen); + if (err < 0) { + dprintk("RPC: getsockname failed (%d)\n", err); + goto out_release; + } - /* Set up the call info struct and execute the task */ - status = task->tk_status; - if (status == 0) - rpc_execute(task); - else - rpc_release_task(task); + err = 0; + if (buf->sa_family == AF_INET6) { + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf; + sin6->sin6_scope_id = 0; + } + dprintk("RPC: %s succeeded\n", __func__); - rpc_restore_sigmask(&oldset); +out_release: + sock_release(sock); out: - return status; + return err; } +/* + * Scraping a connected socket failed, so we don't have a useable + * local address. Fallback: generate an address that will prevent + * the server from calling us back. + * + * Returns zero and fills in "buf" if successful; otherwise, a + * negative errno is returned. + */ +static int rpc_anyaddr(int family, struct sockaddr *buf, size_t buflen) +{ + switch (family) { + case AF_INET: + if (buflen < sizeof(rpc_inaddr_loopback)) + return -EINVAL; + memcpy(buf, &rpc_inaddr_loopback, + sizeof(rpc_inaddr_loopback)); + break; + case AF_INET6: + if (buflen < sizeof(rpc_in6addr_loopback)) + return -EINVAL; + memcpy(buf, &rpc_in6addr_loopback, + sizeof(rpc_in6addr_loopback)); + default: + dprintk("RPC: %s: address family not supported\n", + __func__); + return -EAFNOSUPPORT; + } + dprintk("RPC: %s: succeeded\n", __func__); + return 0; +} -void -rpc_call_setup(struct rpc_task *task, struct rpc_message *msg, int flags) +/** + * rpc_localaddr - discover local endpoint address for an RPC client + * @clnt: RPC client structure + * @buf: target buffer + * @buflen: size of target buffer, in bytes + * + * Returns zero and fills in "buf" and "buflen" if successful; + * otherwise, a negative errno is returned. + * + * This works even if the underlying transport is not currently connected, + * or if the upper layer never previously provided a source address. + * + * The result of this function call is transient: multiple calls in + * succession may give different results, depending on how local + * networking configuration changes over time. + */ +int rpc_localaddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t buflen) { - task->tk_msg = *msg; - task->tk_flags |= flags; - /* Bind the user cred */ - if (task->tk_msg.rpc_cred != NULL) - rpcauth_holdcred(task); - else - rpcauth_bindcred(task); + struct sockaddr_storage address; + struct sockaddr *sap = (struct sockaddr *)&address; + struct rpc_xprt *xprt; + struct net *net; + size_t salen; + int err; - if (task->tk_status == 0) - task->tk_action = call_start; - else - task->tk_action = NULL; + rcu_read_lock(); + xprt = rcu_dereference(clnt->cl_xprt); + salen = xprt->addrlen; + memcpy(sap, &xprt->addr, salen); + net = get_net(xprt->xprt_net); + rcu_read_unlock(); + + rpc_set_port(sap, 0); + err = rpc_sockname(net, sap, salen, buf, buflen); + put_net(net); + if (err != 0) + /* Couldn't discover local address, return ANYADDR */ + return rpc_anyaddr(sap->sa_family, buf, buflen); + return 0; } +EXPORT_SYMBOL_GPL(rpc_localaddr); void rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize) { - struct rpc_xprt *xprt = clnt->cl_xprt; + struct rpc_xprt *xprt; + + rcu_read_lock(); + xprt = rcu_dereference(clnt->cl_xprt); if (xprt->ops->set_buffer_size) xprt->ops->set_buffer_size(xprt, sndsize, rcvsize); + rcu_read_unlock(); } +EXPORT_SYMBOL_GPL(rpc_setbufsize); -/* - * Return size of largest payload RPC client can support, in bytes +/** + * rpc_protocol - Get transport protocol number for an RPC client + * @clnt: RPC client to query + * + */ +int rpc_protocol(struct rpc_clnt *clnt) +{ + int protocol; + + rcu_read_lock(); + protocol = rcu_dereference(clnt->cl_xprt)->prot; + rcu_read_unlock(); + return protocol; +} +EXPORT_SYMBOL_GPL(rpc_protocol); + +/** + * rpc_net_ns - Get the network namespace for this RPC client + * @clnt: RPC client to query + * + */ +struct net *rpc_net_ns(struct rpc_clnt *clnt) +{ + struct net *ret; + + rcu_read_lock(); + ret = rcu_dereference(clnt->cl_xprt)->xprt_net; + rcu_read_unlock(); + return ret; +} +EXPORT_SYMBOL_GPL(rpc_net_ns); + +/** + * rpc_max_payload - Get maximum payload size for a transport, in bytes + * @clnt: RPC client to query * * For stream transports, this is one RPC record fragment (see RFC * 1831), as we don't support multi-record requests yet. For datagram @@ -531,22 +1322,91 @@ rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize */ size_t rpc_max_payload(struct rpc_clnt *clnt) { - return clnt->cl_xprt->max_payload; + size_t ret; + + rcu_read_lock(); + ret = rcu_dereference(clnt->cl_xprt)->max_payload; + rcu_read_unlock(); + return ret; } -EXPORT_SYMBOL(rpc_max_payload); +EXPORT_SYMBOL_GPL(rpc_max_payload); + +/** + * rpc_get_timeout - Get timeout for transport in units of HZ + * @clnt: RPC client to query + */ +unsigned long rpc_get_timeout(struct rpc_clnt *clnt) +{ + unsigned long ret; + + rcu_read_lock(); + ret = rcu_dereference(clnt->cl_xprt)->timeout->to_initval; + rcu_read_unlock(); + return ret; +} +EXPORT_SYMBOL_GPL(rpc_get_timeout); + +/** + * rpc_force_rebind - force transport to check that remote port is unchanged + * @clnt: client to rebind + * + */ +void rpc_force_rebind(struct rpc_clnt *clnt) +{ + if (clnt->cl_autobind) { + rcu_read_lock(); + xprt_clear_bound(rcu_dereference(clnt->cl_xprt)); + rcu_read_unlock(); + } +} +EXPORT_SYMBOL_GPL(rpc_force_rebind); + +/* + * Restart an (async) RPC call from the call_prepare state. + * Usually called from within the exit handler. + */ +int +rpc_restart_call_prepare(struct rpc_task *task) +{ + if (RPC_ASSASSINATED(task)) + return 0; + task->tk_action = call_start; + task->tk_status = 0; + if (task->tk_ops->rpc_call_prepare != NULL) + task->tk_action = rpc_prepare_task; + return 1; +} +EXPORT_SYMBOL_GPL(rpc_restart_call_prepare); /* * Restart an (async) RPC call. Usually called from within the * exit handler. */ -void +int rpc_restart_call(struct rpc_task *task) { if (RPC_ASSASSINATED(task)) - return; - + return 0; task->tk_action = call_start; + task->tk_status = 0; + return 1; +} +EXPORT_SYMBOL_GPL(rpc_restart_call); + +#ifdef RPC_DEBUG +static const char *rpc_proc_name(const struct rpc_task *task) +{ + const struct rpc_procinfo *proc = task->tk_msg.rpc_proc; + + if (proc) { + if (proc->p_name) + return proc->p_name; + else + return "NULL"; + } else + return "no proc"; } +#endif /* * 0. Initial state @@ -559,9 +1419,10 @@ call_start(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; - dprintk("RPC: %4d call_start %s%d proc %d (%s)\n", task->tk_pid, - clnt->cl_protname, clnt->cl_vers, task->tk_msg.rpc_proc->p_proc, - (RPC_IS_ASYNC(task) ? "async" : "sync")); + dprintk("RPC: %5u call_start %s%d proc %s (%s)\n", task->tk_pid, + clnt->cl_program->name, clnt->cl_vers, + rpc_proc_name(task), + (RPC_IS_ASYNC(task) ? "async" : "sync")); /* Increment call count */ task->tk_msg.rpc_proc->p_count++; @@ -575,18 +1436,15 @@ call_start(struct rpc_task *task) static void call_reserve(struct rpc_task *task) { - dprintk("RPC: %4d call_reserve\n", task->tk_pid); - - if (!rpcauth_uptodatecred(task)) { - task->tk_action = call_refresh; - return; - } + dprint_status(task); task->tk_status = 0; task->tk_action = call_reserveresult; xprt_reserve(task); } +static void call_retry_reserve(struct rpc_task *task); + /* * 1b. Grok the result of xprt_reserve() */ @@ -595,8 +1453,7 @@ call_reserveresult(struct rpc_task *task) { int status = task->tk_status; - dprintk("RPC: %4d call_reserveresult (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); /* * After a call to xprt_reserve(), we must have either @@ -605,12 +1462,12 @@ call_reserveresult(struct rpc_task *task) task->tk_status = 0; if (status >= 0) { if (task->tk_rqstp) { - task->tk_action = call_allocate; + task->tk_action = call_refresh; return; } printk(KERN_ERR "%s: status=%d, but no request slot, exiting\n", - __FUNCTION__, status); + __func__, status); rpc_exit(task, -EIO); return; } @@ -621,50 +1478,136 @@ call_reserveresult(struct rpc_task *task) */ if (task->tk_rqstp) { printk(KERN_ERR "%s: status=%d, request allocated anyway\n", - __FUNCTION__, status); + __func__, status); xprt_release(task); } switch (status) { + case -ENOMEM: + rpc_delay(task, HZ >> 2); case -EAGAIN: /* woken up; retry */ - task->tk_action = call_reserve; + task->tk_action = call_retry_reserve; return; case -EIO: /* probably a shutdown */ break; default: printk(KERN_ERR "%s: unrecognized error %d, exiting\n", - __FUNCTION__, status); + __func__, status); break; } rpc_exit(task, status); } /* - * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. - * (Note: buffer memory is freed in rpc_task_release). + * 1c. Retry reserving an RPC call slot + */ +static void +call_retry_reserve(struct rpc_task *task) +{ + dprint_status(task); + + task->tk_status = 0; + task->tk_action = call_reserveresult; + xprt_retry_reserve(task); +} + +/* + * 2. Bind and/or refresh the credentials + */ +static void +call_refresh(struct rpc_task *task) +{ + dprint_status(task); + + task->tk_action = call_refreshresult; + task->tk_status = 0; + task->tk_client->cl_stats->rpcauthrefresh++; + rpcauth_refreshcred(task); +} + +/* + * 2a. Process the results of a credential refresh + */ +static void +call_refreshresult(struct rpc_task *task) +{ + int status = task->tk_status; + + dprint_status(task); + + task->tk_status = 0; + task->tk_action = call_refresh; + switch (status) { + case 0: + if (rpcauth_uptodatecred(task)) { + task->tk_action = call_allocate; + return; + } + /* Use rate-limiting and a max number of retries if refresh + * had status 0 but failed to update the cred. + */ + case -ETIMEDOUT: + rpc_delay(task, 3*HZ); + case -EAGAIN: + status = -EACCES; + case -EKEYEXPIRED: + if (!task->tk_cred_retry) + break; + task->tk_cred_retry--; + dprintk("RPC: %5u %s: retry refresh creds\n", + task->tk_pid, __func__); + return; + } + dprintk("RPC: %5u %s: refresh creds failed with error %d\n", + task->tk_pid, __func__, status); + rpc_exit(task, status); +} + +/* + * 2b. Allocate the buffer. For details, see sched.c:rpc_malloc. + * (Note: buffer memory is freed in xprt_release). */ static void call_allocate(struct rpc_task *task) { - unsigned int bufsiz; + unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack; + struct rpc_rqst *req = task->tk_rqstp; + struct rpc_xprt *xprt = req->rq_xprt; + struct rpc_procinfo *proc = task->tk_msg.rpc_proc; - dprintk("RPC: %4d call_allocate (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); + + task->tk_status = 0; task->tk_action = call_bind; - if (task->tk_buffer) + + if (req->rq_buffer) return; - /* FIXME: compute buffer requirements more exactly using - * auth->au_wslack */ - bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE; + if (proc->p_proc != 0) { + BUG_ON(proc->p_arglen == 0); + if (proc->p_decode != NULL) + BUG_ON(proc->p_replen == 0); + } - if (rpc_malloc(task, bufsiz << 1) != NULL) + /* + * Calculate the size (in quads) of the RPC call + * and reply headers, and convert both values + * to byte sizes. + */ + req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen; + req->rq_callsize <<= 2; + req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen; + req->rq_rcvsize <<= 2; + + req->rq_buffer = xprt->ops->buf_alloc(task, + req->rq_callsize + req->rq_rcvsize); + if (req->rq_buffer != NULL) return; - printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task); - if (RPC_IS_ASYNC(task) || !signalled()) { - xprt_release(task); - task->tk_action = call_reserve; + dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid); + + if (RPC_IS_ASYNC(task) || !fatal_signal_pending(current)) { + task->tk_action = call_allocate; rpc_delay(task, HZ>>4); return; } @@ -672,54 +1615,63 @@ call_allocate(struct rpc_task *task) rpc_exit(task, -ERESTARTSYS); } +static inline int +rpc_task_need_encode(struct rpc_task *task) +{ + return task->tk_rqstp->rq_snd_buf.len == 0; +} + +static inline void +rpc_task_force_reencode(struct rpc_task *task) +{ + task->tk_rqstp->rq_snd_buf.len = 0; + task->tk_rqstp->rq_bytes_sent = 0; +} + +static inline void +rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) +{ + buf->head[0].iov_base = start; + buf->head[0].iov_len = len; + buf->tail[0].iov_len = 0; + buf->page_len = 0; + buf->flags = 0; + buf->len = 0; + buf->buflen = len; +} + /* * 3. Encode arguments of an RPC call */ static void -call_encode(struct rpc_task *task) +rpc_xdr_encode(struct rpc_task *task) { struct rpc_rqst *req = task->tk_rqstp; - struct xdr_buf *sndbuf = &req->rq_snd_buf; - struct xdr_buf *rcvbuf = &req->rq_rcv_buf; - unsigned int bufsiz; - kxdrproc_t encode; - u32 *p; + kxdreproc_t encode; + __be32 *p; - dprintk("RPC: %4d call_encode (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); - /* Default buffer setup */ - bufsiz = task->tk_bufsize >> 1; - sndbuf->head[0].iov_base = (void *)task->tk_buffer; - sndbuf->head[0].iov_len = bufsiz; - sndbuf->tail[0].iov_len = 0; - sndbuf->page_len = 0; - sndbuf->len = 0; - sndbuf->buflen = bufsiz; - rcvbuf->head[0].iov_base = (void *)((char *)task->tk_buffer + bufsiz); - rcvbuf->head[0].iov_len = bufsiz; - rcvbuf->tail[0].iov_len = 0; - rcvbuf->page_len = 0; - rcvbuf->len = 0; - rcvbuf->buflen = bufsiz; - - /* Encode header and provided arguments */ - encode = task->tk_msg.rpc_proc->p_encode; - if (!(p = call_header(task))) { - printk(KERN_INFO "RPC: call_header failed, exit EIO\n"); + rpc_xdr_buf_init(&req->rq_snd_buf, + req->rq_buffer, + req->rq_callsize); + rpc_xdr_buf_init(&req->rq_rcv_buf, + (char *)req->rq_buffer + req->rq_callsize, + req->rq_rcvsize); + + p = rpc_encode_header(task); + if (p == NULL) { + printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n"); rpc_exit(task, -EIO); return; } + + encode = task->tk_msg.rpc_proc->p_encode; if (encode == NULL) return; task->tk_status = rpcauth_wrap_req(task, encode, req, p, task->tk_msg.rpc_argp); - if (task->tk_status == -ENOMEM) { - /* XXX: Is this sane? */ - rpc_delay(task, 3*HZ); - task->tk_status = -EAGAIN; - } } /* @@ -728,16 +1680,15 @@ call_encode(struct rpc_task *task) static void call_bind(struct rpc_task *task) { - struct rpc_clnt *clnt = task->tk_client; + struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; - dprintk("RPC: %4d call_bind (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); task->tk_action = call_connect; - if (!clnt->cl_port) { + if (!xprt_bound(xprt)) { task->tk_action = call_bind_status; - task->tk_timeout = task->tk_xprt->bind_timeout; - rpc_getport(task, clnt); + task->tk_timeout = xprt->bind_timeout; + xprt->ops->rpcbind(task); } } @@ -747,52 +1698,74 @@ call_bind(struct rpc_task *task) static void call_bind_status(struct rpc_task *task) { - int status = -EACCES; + int status = -EIO; if (task->tk_status >= 0) { - dprintk("RPC: %4d call_bind_status (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); task->tk_status = 0; task->tk_action = call_connect; return; } + trace_rpc_bind_status(task); switch (task->tk_status) { + case -ENOMEM: + dprintk("RPC: %5u rpcbind out of memory\n", task->tk_pid); + rpc_delay(task, HZ >> 2); + goto retry_timeout; case -EACCES: - dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n", - task->tk_pid); + dprintk("RPC: %5u remote rpcbind: RPC program/version " + "unavailable\n", task->tk_pid); + /* fail immediately if this is an RPC ping */ + if (task->tk_msg.rpc_proc->p_proc == 0) { + status = -EOPNOTSUPP; + break; + } + if (task->tk_rebind_retry == 0) + break; + task->tk_rebind_retry--; rpc_delay(task, 3*HZ); - goto retry_bind; + goto retry_timeout; case -ETIMEDOUT: - dprintk("RPC: %4d rpcbind request timed out\n", + dprintk("RPC: %5u rpcbind request timed out\n", task->tk_pid); - if (RPC_IS_SOFT(task)) { - status = -EIO; - break; - } - goto retry_bind; + goto retry_timeout; case -EPFNOSUPPORT: - dprintk("RPC: %4d remote rpcbind service unavailable\n", + /* server doesn't support any rpcbind version we know of */ + dprintk("RPC: %5u unrecognized remote rpcbind service\n", task->tk_pid); break; case -EPROTONOSUPPORT: - dprintk("RPC: %4d remote rpcbind version 2 unavailable\n", + dprintk("RPC: %5u remote rpcbind version unavailable, retrying\n", task->tk_pid); + goto retry_timeout; + case -ECONNREFUSED: /* connection problems */ + case -ECONNRESET: + case -ECONNABORTED: + case -ENOTCONN: + case -EHOSTDOWN: + case -EHOSTUNREACH: + case -ENETUNREACH: + case -EPIPE: + dprintk("RPC: %5u remote rpcbind unreachable: %d\n", + task->tk_pid, task->tk_status); + if (!RPC_IS_SOFTCONN(task)) { + rpc_delay(task, 5*HZ); + goto retry_timeout; + } + status = task->tk_status; break; default: - dprintk("RPC: %4d unrecognized rpcbind error (%d)\n", + dprintk("RPC: %5u unrecognized rpcbind error (%d)\n", task->tk_pid, -task->tk_status); - status = -EIO; - break; } rpc_exit(task, status); return; -retry_bind: +retry_timeout: task->tk_status = 0; - task->tk_action = call_bind; - return; + task->tk_action = call_timeout; } /* @@ -801,9 +1774,9 @@ retry_bind: static void call_connect(struct rpc_task *task) { - struct rpc_xprt *xprt = task->tk_xprt; + struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; - dprintk("RPC: %4d call_connect xprt %p %s connected\n", + dprintk("RPC: %5u call_connect xprt %p %s connected\n", task->tk_pid, xprt, (xprt_connected(xprt) ? "is" : "is not")); @@ -812,6 +1785,10 @@ call_connect(struct rpc_task *task) task->tk_action = call_connect_status; if (task->tk_status < 0) return; + if (task->tk_flags & RPC_TASK_NOCONNECT) { + rpc_exit(task, -ENOTCONN); + return; + } xprt_connect(task); } } @@ -825,30 +1802,31 @@ call_connect_status(struct rpc_task *task) struct rpc_clnt *clnt = task->tk_client; int status = task->tk_status; - dprintk("RPC: %5u call_connect_status (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); + trace_rpc_connect_status(task, status); task->tk_status = 0; - if (status >= 0) { + switch (status) { + case -ECONNREFUSED: + case -ECONNRESET: + case -ECONNABORTED: + case -ENETUNREACH: + case -EHOSTUNREACH: + if (RPC_IS_SOFTCONN(task)) + break; + /* retry with existing socket, after a delay */ + rpc_delay(task, 3*HZ); + case -EAGAIN: + /* Check for timeouts before looping back to call_bind */ + case -ETIMEDOUT: + task->tk_action = call_timeout; + return; + case 0: clnt->cl_stats->netreconn++; task->tk_action = call_transmit; return; } - - /* Something failed: remote service port may have changed */ - if (clnt->cl_autobind) - clnt->cl_port = 0; - - switch (status) { - case -ENOTCONN: - case -ETIMEDOUT: - case -EAGAIN: - task->tk_action = call_bind; - break; - default: - rpc_exit(task, -EIO); - break; - } + rpc_exit(task, status); } /* @@ -857,34 +1835,157 @@ call_connect_status(struct rpc_task *task) static void call_transmit(struct rpc_task *task) { - dprintk("RPC: %4d call_transmit (status %d)\n", - task->tk_pid, task->tk_status); + int is_retrans = RPC_WAS_SENT(task); + + dprint_status(task); task->tk_action = call_status; if (task->tk_status < 0) return; - task->tk_status = xprt_prepare_transmit(task); - if (task->tk_status != 0) + if (!xprt_prepare_transmit(task)) return; + task->tk_action = call_transmit_status; /* Encode here so that rpcsec_gss can use correct sequence number. */ - if (task->tk_rqstp->rq_bytes_sent == 0) { - call_encode(task); + if (rpc_task_need_encode(task)) { + rpc_xdr_encode(task); /* Did the encode result in an error condition? */ - if (task->tk_status != 0) - goto out_nosend; + if (task->tk_status != 0) { + /* Was the error nonfatal? */ + if (task->tk_status == -EAGAIN) + rpc_delay(task, HZ >> 4); + else + rpc_exit(task, task->tk_status); + return; + } } xprt_transmit(task); if (task->tk_status < 0) return; - if (!task->tk_msg.rpc_proc->p_decode) { - task->tk_action = NULL; - rpc_wake_up_task(task); + if (is_retrans) + task->tk_client->cl_stats->rpcretrans++; + /* + * On success, ensure that we call xprt_end_transmit() before sleeping + * in order to allow access to the socket to other RPC requests. + */ + call_transmit_status(task); + if (rpc_reply_expected(task)) + return; + task->tk_action = rpc_exit_task; + rpc_wake_up_queued_task(&task->tk_rqstp->rq_xprt->pending, task); +} + +/* + * 5a. Handle cleanup after a transmission + */ +static void +call_transmit_status(struct rpc_task *task) +{ + task->tk_action = call_status; + + /* + * Common case: success. Force the compiler to put this + * test first. + */ + if (task->tk_status == 0) { + xprt_end_transmit(task); + rpc_task_force_reencode(task); + return; } - return; -out_nosend: - /* release socket write lock before attempting to handle error */ - xprt_abort_transmit(task); + + switch (task->tk_status) { + case -EAGAIN: + break; + default: + dprint_status(task); + xprt_end_transmit(task); + rpc_task_force_reencode(task); + break; + /* + * Special cases: if we've been waiting on the + * socket's write_space() callback, or if the + * socket just returned a connection error, + * then hold onto the transport lock. + */ + case -ECONNREFUSED: + case -EHOSTDOWN: + case -EHOSTUNREACH: + case -ENETUNREACH: + if (RPC_IS_SOFTCONN(task)) { + xprt_end_transmit(task); + rpc_exit(task, task->tk_status); + break; + } + case -ECONNRESET: + case -ECONNABORTED: + case -ENOTCONN: + case -EPIPE: + rpc_task_force_reencode(task); + } +} + +#if defined(CONFIG_SUNRPC_BACKCHANNEL) +/* + * 5b. Send the backchannel RPC reply. On error, drop the reply. In + * addition, disconnect on connectivity errors. + */ +static void +call_bc_transmit(struct rpc_task *task) +{ + struct rpc_rqst *req = task->tk_rqstp; + + if (!xprt_prepare_transmit(task)) { + /* + * Could not reserve the transport. Try again after the + * transport is released. + */ + task->tk_status = 0; + task->tk_action = call_bc_transmit; + return; + } + + task->tk_action = rpc_exit_task; + if (task->tk_status < 0) { + printk(KERN_NOTICE "RPC: Could not send backchannel reply " + "error: %d\n", task->tk_status); + return; + } + + xprt_transmit(task); + xprt_end_transmit(task); + dprint_status(task); + switch (task->tk_status) { + case 0: + /* Success */ + break; + case -EHOSTDOWN: + case -EHOSTUNREACH: + case -ENETUNREACH: + case -ETIMEDOUT: + /* + * Problem reaching the server. Disconnect and let the + * forechannel reestablish the connection. The server will + * have to retransmit the backchannel request and we'll + * reprocess it. Since these ops are idempotent, there's no + * need to cache our reply at this time. + */ + printk(KERN_NOTICE "RPC: Could not send backchannel reply " + "error: %d\n", task->tk_status); + xprt_conditional_disconnect(req->rq_xprt, + req->rq_connect_cookie); + break; + default: + /* + * We were unable to reply and will have to drop the + * request. The server should reconnect and retransmit. + */ + WARN_ON_ONCE(task->tk_status == -EAGAIN); + printk(KERN_NOTICE "RPC: Could not send backchannel reply " + "error: %d\n", task->tk_status); + break; + } + rpc_wake_up_queued_task(&req->rq_xprt->pending, task); } +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ /* * 6. Sort out the RPC call status @@ -896,11 +1997,10 @@ call_status(struct rpc_task *task) struct rpc_rqst *req = task->tk_rqstp; int status; - if (req->rq_received > 0 && !req->rq_bytes_sent) - task->tk_status = req->rq_received; + if (req->rq_reply_bytes_recvd > 0 && !req->rq_bytes_sent) + task->tk_status = req->rq_reply_bytes_recvd; - dprintk("RPC: %4d call_status (status %d)\n", - task->tk_pid, task->tk_status); + dprint_status(task); status = task->tk_status; if (status >= 0) { @@ -908,16 +2008,35 @@ call_status(struct rpc_task *task) return; } + trace_rpc_call_status(task); task->tk_status = 0; switch(status) { + case -EHOSTDOWN: + case -EHOSTUNREACH: + case -ENETUNREACH: + if (RPC_IS_SOFTCONN(task)) { + rpc_exit(task, status); + break; + } + /* + * Delay any retries for 3 seconds, then handle as if it + * were a timeout. + */ + rpc_delay(task, 3*HZ); case -ETIMEDOUT: task->tk_action = call_timeout; + if (!(task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) + && task->tk_client->cl_discrtry) + xprt_conditional_disconnect(req->rq_xprt, + req->rq_connect_cookie); break; case -ECONNREFUSED: + case -ECONNRESET: + case -ECONNABORTED: + rpc_force_rebind(clnt); + rpc_delay(task, 3*HZ); + case -EPIPE: case -ENOTCONN: - req->rq_bytes_sent = 0; - if (clnt->cl_autobind) - clnt->cl_port = 0; task->tk_action = call_bind; break; case -EAGAIN: @@ -930,9 +2049,8 @@ call_status(struct rpc_task *task) default: if (clnt->cl_chatty) printk("%s: RPC call returned error %d\n", - clnt->cl_protname, -status); + clnt->cl_program->name, -status); rpc_exit(task, status); - break; } } @@ -947,29 +2065,50 @@ call_timeout(struct rpc_task *task) struct rpc_clnt *clnt = task->tk_client; if (xprt_adjust_timeout(task->tk_rqstp) == 0) { - dprintk("RPC: %4d call_timeout (minor)\n", task->tk_pid); + dprintk("RPC: %5u call_timeout (minor)\n", task->tk_pid); goto retry; } - dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid); + dprintk("RPC: %5u call_timeout (major)\n", task->tk_pid); + task->tk_timeouts++; + + if (RPC_IS_SOFTCONN(task)) { + rpc_exit(task, -ETIMEDOUT); + return; + } if (RPC_IS_SOFT(task)) { - if (clnt->cl_chatty) + if (clnt->cl_chatty) { + rcu_read_lock(); printk(KERN_NOTICE "%s: server %s not responding, timed out\n", - clnt->cl_protname, clnt->cl_server); - rpc_exit(task, -EIO); + clnt->cl_program->name, + rcu_dereference(clnt->cl_xprt)->servername); + rcu_read_unlock(); + } + if (task->tk_flags & RPC_TASK_TIMEOUT) + rpc_exit(task, -ETIMEDOUT); + else + rpc_exit(task, -EIO); return; } - if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) { + if (!(task->tk_flags & RPC_CALL_MAJORSEEN)) { task->tk_flags |= RPC_CALL_MAJORSEEN; - printk(KERN_NOTICE "%s: server %s not responding, still trying\n", - clnt->cl_protname, clnt->cl_server); + if (clnt->cl_chatty) { + rcu_read_lock(); + printk(KERN_NOTICE "%s: server %s not responding, still trying\n", + clnt->cl_program->name, + rcu_dereference(clnt->cl_xprt)->servername); + rcu_read_unlock(); + } } - if (clnt->cl_autobind) - clnt->cl_port = 0; + rpc_force_rebind(clnt); + /* + * Did our request time out due to an RPCSEC_GSS out-of-sequence + * event? RFC2203 requires the server to drop all such requests. + */ + rpcauth_invalcred(task); retry: - clnt->cl_stats->rpcretrans++; task->tk_action = call_bind; task->tk_status = 0; } @@ -982,108 +2121,81 @@ call_decode(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_rqst *req = task->tk_rqstp; - kxdrproc_t decode = task->tk_msg.rpc_proc->p_decode; - u32 *p; - - dprintk("RPC: %4d call_decode (status %d)\n", - task->tk_pid, task->tk_status); - - if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) { - printk(KERN_NOTICE "%s: server %s OK\n", - clnt->cl_protname, clnt->cl_server); - task->tk_flags &= ~RPC_CALL_MAJORSEEN; - } - - if (task->tk_status < 12) { - if (!RPC_IS_SOFT(task)) { - task->tk_action = call_bind; - clnt->cl_stats->rpcretrans++; - goto out_retry; + kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; + __be32 *p; + + dprint_status(task); + + if (task->tk_flags & RPC_CALL_MAJORSEEN) { + if (clnt->cl_chatty) { + rcu_read_lock(); + printk(KERN_NOTICE "%s: server %s OK\n", + clnt->cl_program->name, + rcu_dereference(clnt->cl_xprt)->servername); + rcu_read_unlock(); } - printk(KERN_WARNING "%s: too small RPC reply size (%d bytes)\n", - clnt->cl_protname, task->tk_status); - rpc_exit(task, -EIO); - return; + task->tk_flags &= ~RPC_CALL_MAJORSEEN; } + /* + * Ensure that we see all writes made by xprt_complete_rqst() + * before it changed req->rq_reply_bytes_recvd. + */ + smp_rmb(); req->rq_rcv_buf.len = req->rq_private_buf.len; /* Check that the softirq receive buffer is valid */ WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, sizeof(req->rq_rcv_buf)) != 0); - /* Verify the RPC header */ - if (!(p = call_verify(task))) { - if (task->tk_action == NULL) - return; + if (req->rq_rcv_buf.len < 12) { + if (!RPC_IS_SOFT(task)) { + task->tk_action = call_bind; + goto out_retry; + } + dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", + clnt->cl_program->name, task->tk_status); + task->tk_action = call_timeout; goto out_retry; } - task->tk_action = NULL; + p = rpc_verify_header(task); + if (IS_ERR(p)) { + if (p == ERR_PTR(-EAGAIN)) + goto out_retry; + return; + } + + task->tk_action = rpc_exit_task; - if (decode) + if (decode) { task->tk_status = rpcauth_unwrap_resp(task, decode, req, p, task->tk_msg.rpc_resp); - dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, - task->tk_status); + } + dprintk("RPC: %5u call_decode result %d\n", task->tk_pid, + task->tk_status); return; out_retry: - req->rq_received = req->rq_private_buf.len = 0; - task->tk_status = 0; -} - -/* - * 8. Refresh the credentials if rejected by the server - */ -static void -call_refresh(struct rpc_task *task) -{ - dprintk("RPC: %4d call_refresh\n", task->tk_pid); - - xprt_release(task); /* Must do to obtain new XID */ - task->tk_action = call_refreshresult; task->tk_status = 0; - task->tk_client->cl_stats->rpcauthrefresh++; - rpcauth_refreshcred(task); -} - -/* - * 8a. Process the results of a credential refresh - */ -static void -call_refreshresult(struct rpc_task *task) -{ - int status = task->tk_status; - dprintk("RPC: %4d call_refreshresult (status %d)\n", - task->tk_pid, task->tk_status); - - task->tk_status = 0; - task->tk_action = call_reserve; - if (status >= 0 && rpcauth_uptodatecred(task)) - return; - if (status == -EACCES) { - rpc_exit(task, -EACCES); - return; + /* Note: rpc_verify_header() may have freed the RPC slot */ + if (task->tk_rqstp == req) { + req->rq_reply_bytes_recvd = req->rq_rcv_buf.len = 0; + if (task->tk_client->cl_discrtry) + xprt_conditional_disconnect(req->rq_xprt, + req->rq_connect_cookie); } - task->tk_action = call_refresh; - if (status != -ETIMEDOUT) - rpc_delay(task, 3*HZ); - return; } -/* - * Call header serialization - */ -static u32 * -call_header(struct rpc_task *task) +static __be32 * +rpc_encode_header(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_rqst *req = task->tk_rqstp; - u32 *p = req->rq_svec[0].iov_base; + __be32 *p = req->rq_svec[0].iov_base; /* FIXME: check buffer size? */ - p = xprt_skip_transport_header(task->tk_xprt, p); + p = xprt_skip_transport_header(req->rq_xprt, p); *p++ = req->rq_xid; /* XID */ *p++ = htonl(RPC_CALL); /* CALL */ *p++ = htonl(RPC_VERSION); /* RPC version */ @@ -1095,38 +2207,56 @@ call_header(struct rpc_task *task) return p; } -/* - * Reply header verification - */ -static u32 * -call_verify(struct rpc_task *task) +static __be32 * +rpc_verify_header(struct rpc_task *task) { + struct rpc_clnt *clnt = task->tk_client; struct kvec *iov = &task->tk_rqstp->rq_rcv_buf.head[0]; int len = task->tk_rqstp->rq_rcv_buf.len >> 2; - u32 *p = iov->iov_base, n; + __be32 *p = iov->iov_base; + u32 n; int error = -EACCES; + if ((task->tk_rqstp->rq_rcv_buf.len & 3) != 0) { + /* RFC-1014 says that the representation of XDR data must be a + * multiple of four bytes + * - if it isn't pointer subtraction in the NFS client may give + * undefined results + */ + dprintk("RPC: %5u %s: XDR representation not a multiple of" + " 4 bytes: 0x%x\n", task->tk_pid, __func__, + task->tk_rqstp->rq_rcv_buf.len); + error = -EIO; + goto out_err; + } if ((len -= 3) < 0) goto out_overflow; - p += 1; /* skip XID */ + p += 1; /* skip XID */ if ((n = ntohl(*p++)) != RPC_REPLY) { - printk(KERN_WARNING "call_verify: not an RPC reply: %x\n", n); - goto out_retry; + dprintk("RPC: %5u %s: not an RPC reply: %x\n", + task->tk_pid, __func__, n); + error = -EIO; + goto out_garbage; } + if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { if (--len < 0) goto out_overflow; switch ((n = ntohl(*p++))) { - case RPC_AUTH_ERROR: - break; - case RPC_MISMATCH: - dprintk("%s: RPC call version mismatch!\n", __FUNCTION__); - error = -EPROTONOSUPPORT; - goto out_err; - default: - dprintk("%s: RPC call rejected, unknown error: %x\n", __FUNCTION__, n); - goto out_eio; + case RPC_AUTH_ERROR: + break; + case RPC_MISMATCH: + dprintk("RPC: %5u %s: RPC call version mismatch!\n", + task->tk_pid, __func__); + error = -EPROTONOSUPPORT; + goto out_err; + default: + dprintk("RPC: %5u %s: RPC call rejected, " + "unknown error: %x\n", + task->tk_pid, __func__, n); + error = -EIO; + goto out_err; } if (--len < 0) goto out_overflow; @@ -1138,97 +2268,112 @@ call_verify(struct rpc_task *task) if (!task->tk_cred_retry) break; task->tk_cred_retry--; - dprintk("RPC: %4d call_verify: retry stale creds\n", - task->tk_pid); + dprintk("RPC: %5u %s: retry stale creds\n", + task->tk_pid, __func__); rpcauth_invalcred(task); - task->tk_action = call_refresh; - return NULL; + /* Ensure we obtain a new XID! */ + xprt_release(task); + task->tk_action = call_reserve; + goto out_retry; case RPC_AUTH_BADCRED: case RPC_AUTH_BADVERF: /* possibly garbled cred/verf? */ if (!task->tk_garb_retry) break; task->tk_garb_retry--; - dprintk("RPC: %4d call_verify: retry garbled creds\n", - task->tk_pid); + dprintk("RPC: %5u %s: retry garbled creds\n", + task->tk_pid, __func__); task->tk_action = call_bind; - return NULL; + goto out_retry; case RPC_AUTH_TOOWEAK: - printk(KERN_NOTICE "call_verify: server requires stronger " - "authentication.\n"); + rcu_read_lock(); + printk(KERN_NOTICE "RPC: server %s requires stronger " + "authentication.\n", + rcu_dereference(clnt->cl_xprt)->servername); + rcu_read_unlock(); break; default: - printk(KERN_WARNING "call_verify: unknown auth error: %x\n", n); + dprintk("RPC: %5u %s: unknown auth error: %x\n", + task->tk_pid, __func__, n); error = -EIO; } - dprintk("RPC: %4d call_verify: call rejected %d\n", - task->tk_pid, n); + dprintk("RPC: %5u %s: call rejected %d\n", + task->tk_pid, __func__, n); goto out_err; } - if (!(p = rpcauth_checkverf(task, p))) { - printk(KERN_WARNING "call_verify: auth check failed\n"); - goto out_retry; /* bad verifier, retry */ + p = rpcauth_checkverf(task, p); + if (IS_ERR(p)) { + error = PTR_ERR(p); + dprintk("RPC: %5u %s: auth check failed with %d\n", + task->tk_pid, __func__, error); + goto out_garbage; /* bad verifier, retry */ } - len = p - (u32 *)iov->iov_base - 1; + len = p - (__be32 *)iov->iov_base - 1; if (len < 0) goto out_overflow; switch ((n = ntohl(*p++))) { case RPC_SUCCESS: return p; case RPC_PROG_UNAVAIL: - dprintk("RPC: call_verify: program %u is unsupported by server %s\n", - (unsigned int)task->tk_client->cl_prog, - task->tk_client->cl_server); + dprintk_rcu("RPC: %5u %s: program %u is unsupported " + "by server %s\n", task->tk_pid, __func__, + (unsigned int)clnt->cl_prog, + rcu_dereference(clnt->cl_xprt)->servername); error = -EPFNOSUPPORT; goto out_err; case RPC_PROG_MISMATCH: - dprintk("RPC: call_verify: program %u, version %u unsupported by server %s\n", - (unsigned int)task->tk_client->cl_prog, - (unsigned int)task->tk_client->cl_vers, - task->tk_client->cl_server); + dprintk_rcu("RPC: %5u %s: program %u, version %u unsupported " + "by server %s\n", task->tk_pid, __func__, + (unsigned int)clnt->cl_prog, + (unsigned int)clnt->cl_vers, + rcu_dereference(clnt->cl_xprt)->servername); error = -EPROTONOSUPPORT; goto out_err; case RPC_PROC_UNAVAIL: - dprintk("RPC: call_verify: proc %p unsupported by program %u, version %u on server %s\n", - task->tk_msg.rpc_proc, - task->tk_client->cl_prog, - task->tk_client->cl_vers, - task->tk_client->cl_server); + dprintk_rcu("RPC: %5u %s: proc %s unsupported by program %u, " + "version %u on server %s\n", + task->tk_pid, __func__, + rpc_proc_name(task), + clnt->cl_prog, clnt->cl_vers, + rcu_dereference(clnt->cl_xprt)->servername); error = -EOPNOTSUPP; goto out_err; case RPC_GARBAGE_ARGS: - dprintk("RPC: %4d %s: server saw garbage\n", task->tk_pid, __FUNCTION__); + dprintk("RPC: %5u %s: server saw garbage\n", + task->tk_pid, __func__); break; /* retry */ default: - printk(KERN_WARNING "call_verify: server accept status: %x\n", n); + dprintk("RPC: %5u %s: server accept status: %x\n", + task->tk_pid, __func__, n); /* Also retry */ } -out_retry: - task->tk_client->cl_stats->rpcgarbage++; +out_garbage: + clnt->cl_stats->rpcgarbage++; if (task->tk_garb_retry) { task->tk_garb_retry--; - dprintk("RPC %s: retrying %4d\n", __FUNCTION__, task->tk_pid); + dprintk("RPC: %5u %s: retrying\n", + task->tk_pid, __func__); task->tk_action = call_bind; - return NULL; +out_retry: + return ERR_PTR(-EAGAIN); } - printk(KERN_WARNING "RPC %s: retry failed, exit EIO\n", __FUNCTION__); -out_eio: - error = -EIO; out_err: rpc_exit(task, error); - return NULL; + dprintk("RPC: %5u %s: call failed with error %d\n", task->tk_pid, + __func__, error); + return ERR_PTR(error); out_overflow: - printk(KERN_WARNING "RPC %s: server reply was truncated.\n", __FUNCTION__); - goto out_retry; + dprintk("RPC: %5u %s: server reply was truncated.\n", task->tk_pid, + __func__); + goto out_garbage; } -static int rpcproc_encode_null(void *rqstp, u32 *data, void *obj) +static void rpcproc_encode_null(void *rqstp, struct xdr_stream *xdr, void *obj) { - return 0; } -static int rpcproc_decode_null(void *rqstp, u32 *data, void *obj) +static int rpcproc_decode_null(void *rqstp, struct xdr_stream *xdr, void *obj) { return 0; } @@ -1238,14 +2383,75 @@ static struct rpc_procinfo rpcproc_null = { .p_decode = rpcproc_decode_null, }; -int rpc_ping(struct rpc_clnt *clnt, int flags) +static int rpc_ping(struct rpc_clnt *clnt) { struct rpc_message msg = { .rpc_proc = &rpcproc_null, }; int err; msg.rpc_cred = authnull_ops.lookup_cred(NULL, NULL, 0); - err = rpc_call_sync(clnt, &msg, flags); + err = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN); put_rpccred(msg.rpc_cred); return err; } + +struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags) +{ + struct rpc_message msg = { + .rpc_proc = &rpcproc_null, + .rpc_cred = cred, + }; + struct rpc_task_setup task_setup_data = { + .rpc_client = clnt, + .rpc_message = &msg, + .callback_ops = &rpc_default_ops, + .flags = flags, + }; + return rpc_run_task(&task_setup_data); +} +EXPORT_SYMBOL_GPL(rpc_call_null); + +#ifdef RPC_DEBUG +static void rpc_show_header(void) +{ + printk(KERN_INFO "-pid- flgs status -client- --rqstp- " + "-timeout ---ops--\n"); +} + +static void rpc_show_task(const struct rpc_clnt *clnt, + const struct rpc_task *task) +{ + const char *rpc_waitq = "none"; + + if (RPC_IS_QUEUED(task)) + rpc_waitq = rpc_qname(task->tk_waitqueue); + + printk(KERN_INFO "%5u %04x %6d %8p %8p %8ld %8p %sv%u %s a:%ps q:%s\n", + task->tk_pid, task->tk_flags, task->tk_status, + clnt, task->tk_rqstp, task->tk_timeout, task->tk_ops, + clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), + task->tk_action, rpc_waitq); +} + +void rpc_show_tasks(struct net *net) +{ + struct rpc_clnt *clnt; + struct rpc_task *task; + int header = 0; + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + + spin_lock(&sn->rpc_client_lock); + list_for_each_entry(clnt, &sn->all_clients, cl_clients) { + spin_lock(&clnt->cl_lock); + list_for_each_entry(task, &clnt->cl_tasks, tk_task) { + if (!header) { + rpc_show_header(); + header++; + } + rpc_show_task(clnt, task); + } + spin_unlock(&clnt->cl_lock); + } + spin_unlock(&sn->rpc_client_lock); +} +#endif |