blob: 23d7451b2938226c879be67208d2431166ea3466 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/lockd/mon.c
3 *
4 * The kernel statd client.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/types.h>
10#include <linux/utsname.h>
11#include <linux/kernel.h>
Chuck Lever94da7662008-12-11 17:56:07 -050012#include <linux/ktime.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Chuck Lever94da7662008-12-11 17:56:07 -050014
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/clnt.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040016#include <linux/sunrpc/xprtsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/sunrpc/svc.h>
18#include <linux/lockd/lockd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Mans Rullgardad5b3652009-03-28 19:55:20 +000020#include <asm/unaligned.h>
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#define NLMDBG_FACILITY NLMDBG_MONITOR
Chuck Lever36e8e662008-12-05 19:02:07 -050023#define NSM_PROGRAM 100024
24#define NSM_VERSION 1
25
26enum {
27 NSMPROC_NULL,
28 NSMPROC_STAT,
29 NSMPROC_MON,
30 NSMPROC_UNMON,
31 NSMPROC_UNMON_ALL,
32 NSMPROC_SIMU_CRASH,
33 NSMPROC_NOTIFY,
34};
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Chuck Lever9c1bfd02008-12-05 19:01:59 -050036struct nsm_args {
Chuck Levercab2d3c2008-12-05 19:03:24 -050037 struct nsm_private *priv;
Chuck Lever9c1bfd02008-12-05 19:01:59 -050038 u32 prog; /* RPC callback info */
39 u32 vers;
40 u32 proc;
41
42 char *mon_name;
43};
44
45struct nsm_res {
46 u32 status;
47 u32 state;
48};
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static struct rpc_program nsm_program;
Chuck Lever67c6d102008-12-05 19:02:45 -050051static LIST_HEAD(nsm_handles);
52static DEFINE_SPINLOCK(nsm_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/*
55 * Local NSM state
56 */
Chuck Lever6c9dc422009-06-17 18:02:10 -070057u32 __read_mostly nsm_local_state;
Chuck Leverb7ba5972008-12-11 17:56:29 -050058int __read_mostly nsm_use_hostnames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Chuck Lever8529bc52008-12-11 17:56:22 -050060static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
61{
62 return (struct sockaddr *)&nsm->sm_addr;
63}
64
Chuck Lever49b56992008-12-11 17:56:37 -050065static struct rpc_clnt *nsm_create(void)
66{
67 struct sockaddr_in sin = {
68 .sin_family = AF_INET,
69 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
70 };
71 struct rpc_create_args args = {
Pavel Emelyanovc653ce32010-09-29 16:04:45 +040072 .net = &init_net,
Chuck Lever49b56992008-12-11 17:56:37 -050073 .protocol = XPRT_TRANSPORT_UDP,
74 .address = (struct sockaddr *)&sin,
75 .addrsize = sizeof(sin),
76 .servername = "rpc.statd",
77 .program = &nsm_program,
78 .version = NSM_VERSION,
79 .authflavor = RPC_AUTH_NULL,
Chuck Lever0e5c2632009-06-17 18:02:11 -070080 .flags = RPC_CLNT_CREATE_NOPING,
Chuck Lever49b56992008-12-11 17:56:37 -050081 };
82
83 return rpc_create(&args);
84}
85
86static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
88 struct rpc_clnt *clnt;
89 int status;
Chuck Levera4846752008-12-04 14:20:23 -050090 struct nsm_args args = {
Chuck Levercab2d3c2008-12-05 19:03:24 -050091 .priv = &nsm->sm_priv,
Chuck Levera4846752008-12-04 14:20:23 -050092 .prog = NLM_PROGRAM,
93 .vers = 3,
94 .proc = NLMPROC_NSM_NOTIFY,
Chuck Lever29ed1402008-12-04 14:20:46 -050095 .mon_name = nsm->sm_mon_name,
Chuck Levera4846752008-12-04 14:20:23 -050096 };
Chuck Leverdead28d2006-03-20 13:44:23 -050097 struct rpc_message msg = {
98 .rpc_argp = &args,
99 .rpc_resp = res,
100 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102 clnt = nsm_create();
103 if (IS_ERR(clnt)) {
104 status = PTR_ERR(clnt);
Chuck Lever5acf4312008-12-04 14:20:31 -0500105 dprintk("lockd: failed to create NSM upcall transport, "
106 "status=%d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 goto out;
108 }
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 memset(res, 0, sizeof(*res));
111
Chuck Leverdead28d2006-03-20 13:44:23 -0500112 msg.rpc_proc = &clnt->cl_procinfo[proc];
113 status = rpc_call_sync(clnt, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (status < 0)
Chuck Lever5acf4312008-12-04 14:20:31 -0500115 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
116 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 else
118 status = 0;
Trond Myklebust90c57552007-06-09 19:49:36 -0400119 rpc_shutdown_client(clnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 out:
121 return status;
122}
123
Chuck Lever1e493232008-12-04 14:21:24 -0500124/**
125 * nsm_monitor - Notify a peer in case we reboot
126 * @host: pointer to nlm_host of peer to notify
127 *
128 * If this peer is not already monitored, this function sends an
129 * upcall to the local rpc.statd to record the name/address of
130 * the peer to notify in case we reboot.
131 *
132 * Returns zero if the peer is monitored by the local rpc.statd;
133 * otherwise a negative errno value is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 */
Chuck Lever1e493232008-12-04 14:21:24 -0500135int nsm_monitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700137 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 struct nsm_res res;
139 int status;
140
Chuck Lever9fee4902008-12-04 14:20:53 -0500141 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700142
143 if (nsm->sm_monitored)
Olaf Kirch977faf32006-10-04 02:15:51 -0700144 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Chuck Lever29ed1402008-12-04 14:20:46 -0500146 /*
147 * Choose whether to record the caller_name or IP address of
148 * this peer in the local rpc.statd's database.
149 */
150 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
151
Chuck Lever36e8e662008-12-05 19:02:07 -0500152 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700153 if (unlikely(res.status != 0))
Chuck Lever5d254b12008-12-04 14:21:15 -0500154 status = -EIO;
Chuck Lever6c9dc422009-06-17 18:02:10 -0700155 if (unlikely(status < 0)) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500156 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700157 return status;
158 }
159
160 nsm->sm_monitored = 1;
161 if (unlikely(nsm_local_state != res.state)) {
162 nsm_local_state = res.state;
163 dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
164 }
165 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166}
167
Chuck Lever356c3eb2008-12-04 14:21:38 -0500168/**
169 * nsm_unmonitor - Unregister peer notification
170 * @host: pointer to nlm_host of peer to stop monitoring
171 *
172 * If this peer is monitored, this function sends an upcall to
173 * tell the local rpc.statd not to send this peer a notification
174 * when we reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 */
Chuck Lever356c3eb2008-12-04 14:21:38 -0500176void nsm_unmonitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700178 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 struct nsm_res res;
Chuck Lever356c3eb2008-12-04 14:21:38 -0500180 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Olaf Kirch9502c522006-10-04 02:15:56 -0700182 if (atomic_read(&nsm->sm_count) == 1
183 && nsm->sm_monitored && !nsm->sm_sticky) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500184 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700185
Chuck Lever36e8e662008-12-05 19:02:07 -0500186 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
Chuck Lever0c7aef42008-12-04 14:21:46 -0500187 if (res.status != 0)
188 status = -EIO;
Olaf Kirch977faf32006-10-04 02:15:51 -0700189 if (status < 0)
Olaf Kirch9502c522006-10-04 02:15:56 -0700190 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
Chuck Lever9fee4902008-12-04 14:20:53 -0500191 nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700192 else
193 nsm->sm_monitored = 0;
Olaf Kirch977faf32006-10-04 02:15:51 -0700194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
Chuck Lever3420a8c2008-12-05 19:03:46 -0500197static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
198 const size_t len)
199{
200 struct nsm_handle *nsm;
201
202 list_for_each_entry(nsm, &nsm_handles, sm_link)
203 if (strlen(nsm->sm_name) == len &&
204 memcmp(nsm->sm_name, hostname, len) == 0)
205 return nsm;
206 return NULL;
207}
208
Chuck Lever77a3ef32008-12-11 17:55:59 -0500209static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
210{
211 struct nsm_handle *nsm;
212
213 list_for_each_entry(nsm, &nsm_handles, sm_link)
Jeff Layton4516fc02009-08-14 12:57:54 -0400214 if (rpc_cmp_addr(nsm_addr(nsm), sap))
Chuck Lever77a3ef32008-12-11 17:55:59 -0500215 return nsm;
216 return NULL;
217}
218
Chuck Lever3420a8c2008-12-05 19:03:46 -0500219static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
220{
221 struct nsm_handle *nsm;
222
223 list_for_each_entry(nsm, &nsm_handles, sm_link)
224 if (memcmp(nsm->sm_priv.data, priv->data,
225 sizeof(priv->data)) == 0)
226 return nsm;
227 return NULL;
228}
229
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500230/*
231 * Construct a unique cookie to match this nsm_handle to this monitored
232 * host. It is passed to the local rpc.statd via NSMPROC_MON, and
233 * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
234 * requests.
235 *
Chuck Lever94da7662008-12-11 17:56:07 -0500236 * The NSM protocol requires that these cookies be unique while the
237 * system is running. We prefer a stronger requirement of making them
238 * unique across reboots. If user space bugs cause a stale cookie to
239 * be sent to the kernel, it could cause the wrong host to lose its
240 * lock state if cookies were not unique across reboots.
241 *
242 * The cookies are exposed only to local user space via loopback. They
243 * do not appear on the physical network. If we want greater security
244 * for some reason, nsm_init_private() could perform a one-way hash to
245 * obscure the contents of the cookie.
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500246 */
247static void nsm_init_private(struct nsm_handle *nsm)
248{
Chuck Lever94da7662008-12-11 17:56:07 -0500249 u64 *p = (u64 *)&nsm->sm_priv.data;
250 struct timespec ts;
Mans Rullgardad5b3652009-03-28 19:55:20 +0000251 s64 ns;
Chuck Lever94da7662008-12-11 17:56:07 -0500252
253 ktime_get_ts(&ts);
Mans Rullgardad5b3652009-03-28 19:55:20 +0000254 ns = timespec_to_ns(&ts);
255 put_unaligned(ns, p);
256 put_unaligned((unsigned long)nsm, p + 1);
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500257}
258
Chuck Leverb39b8972008-12-11 17:55:52 -0500259static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
260 const size_t salen,
261 const char *hostname,
262 const size_t hostname_len)
263{
264 struct nsm_handle *new;
265
266 new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
267 if (unlikely(new == NULL))
268 return NULL;
269
270 atomic_set(&new->sm_count, 1);
271 new->sm_name = (char *)(new + 1);
272 memcpy(nsm_addr(new), sap, salen);
273 new->sm_addrlen = salen;
274 nsm_init_private(new);
Chuck Leverc15128c2009-08-09 15:09:39 -0400275
276 if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
277 sizeof(new->sm_addrbuf)) == 0)
278 (void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
279 "unsupported address family");
Chuck Leverb39b8972008-12-11 17:55:52 -0500280 memcpy(new->sm_name, hostname, hostname_len);
281 new->sm_name[hostname_len] = '\0';
282
283 return new;
284}
285
Chuck Lever67c6d102008-12-05 19:02:45 -0500286/**
Chuck Lever92fd91b2008-12-05 19:04:01 -0500287 * nsm_get_handle - Find or create a cached nsm_handle
Chuck Lever67c6d102008-12-05 19:02:45 -0500288 * @sap: pointer to socket address of handle to find
289 * @salen: length of socket address
290 * @hostname: pointer to C string containing hostname to find
291 * @hostname_len: length of C string
Chuck Lever67c6d102008-12-05 19:02:45 -0500292 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500293 * Behavior is modulated by the global nsm_use_hostnames variable.
Chuck Lever67c6d102008-12-05 19:02:45 -0500294 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500295 * Returns a cached nsm_handle after bumping its ref count, or
296 * returns a fresh nsm_handle if a handle that matches @sap and/or
297 * @hostname cannot be found in the handle cache. Returns NULL if
298 * an error occurs.
Chuck Lever67c6d102008-12-05 19:02:45 -0500299 */
Chuck Lever92fd91b2008-12-05 19:04:01 -0500300struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
301 const size_t salen, const char *hostname,
302 const size_t hostname_len)
Chuck Lever67c6d102008-12-05 19:02:45 -0500303{
Chuck Lever77a3ef32008-12-11 17:55:59 -0500304 struct nsm_handle *cached, *new = NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500305
Chuck Lever67c6d102008-12-05 19:02:45 -0500306 if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
307 if (printk_ratelimit()) {
308 printk(KERN_WARNING "Invalid hostname \"%.*s\" "
309 "in NFS lock request\n",
310 (int)hostname_len, hostname);
311 }
312 return NULL;
313 }
314
315retry:
316 spin_lock(&nsm_lock);
Chuck Lever67c6d102008-12-05 19:02:45 -0500317
Chuck Lever77a3ef32008-12-11 17:55:59 -0500318 if (nsm_use_hostnames && hostname != NULL)
319 cached = nsm_lookup_hostname(hostname, hostname_len);
320 else
321 cached = nsm_lookup_addr(sap);
322
323 if (cached != NULL) {
324 atomic_inc(&cached->sm_count);
325 spin_unlock(&nsm_lock);
326 kfree(new);
327 dprintk("lockd: found nsm_handle for %s (%s), "
328 "cnt %d\n", cached->sm_name,
329 cached->sm_addrbuf,
330 atomic_read(&cached->sm_count));
331 return cached;
Chuck Lever67c6d102008-12-05 19:02:45 -0500332 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500333
334 if (new != NULL) {
335 list_add(&new->sm_link, &nsm_handles);
336 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500337 dprintk("lockd: created nsm_handle for %s (%s)\n",
Chuck Lever77a3ef32008-12-11 17:55:59 -0500338 new->sm_name, new->sm_addrbuf);
339 return new;
Chuck Lever67c6d102008-12-05 19:02:45 -0500340 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500341
Chuck Lever67c6d102008-12-05 19:02:45 -0500342 spin_unlock(&nsm_lock);
343
Chuck Lever77a3ef32008-12-11 17:55:59 -0500344 new = nsm_create_handle(sap, salen, hostname, hostname_len);
345 if (unlikely(new == NULL))
Chuck Lever67c6d102008-12-05 19:02:45 -0500346 return NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500347 goto retry;
Chuck Lever67c6d102008-12-05 19:02:45 -0500348}
349
350/**
Chuck Lever3420a8c2008-12-05 19:03:46 -0500351 * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
352 * @info: pointer to NLMPROC_SM_NOTIFY arguments
353 *
Jeff Layton7e469af2010-02-05 15:09:22 -0500354 * Returns a matching nsm_handle if found in the nsm cache. The returned
355 * nsm_handle's reference count is bumped. Otherwise returns NULL if some
356 * error occurred.
Chuck Lever3420a8c2008-12-05 19:03:46 -0500357 */
358struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
359{
360 struct nsm_handle *cached;
361
362 spin_lock(&nsm_lock);
363
Chuck Lever94da7662008-12-11 17:56:07 -0500364 cached = nsm_lookup_priv(&info->priv);
Chuck Lever3420a8c2008-12-05 19:03:46 -0500365 if (unlikely(cached == NULL)) {
366 spin_unlock(&nsm_lock);
367 dprintk("lockd: never saw rebooted peer '%.*s' before\n",
368 info->len, info->mon);
369 return cached;
370 }
371
372 atomic_inc(&cached->sm_count);
373 spin_unlock(&nsm_lock);
374
Chuck Lever3420a8c2008-12-05 19:03:46 -0500375 dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
376 cached->sm_name, cached->sm_addrbuf,
377 atomic_read(&cached->sm_count));
378 return cached;
379}
380
381/**
Chuck Lever67c6d102008-12-05 19:02:45 -0500382 * nsm_release - Release an NSM handle
383 * @nsm: pointer to handle to be released
384 *
385 */
386void nsm_release(struct nsm_handle *nsm)
387{
Chuck Lever67c6d102008-12-05 19:02:45 -0500388 if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
389 list_del(&nsm->sm_link);
390 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500391 dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
392 nsm->sm_name, nsm->sm_addrbuf);
Chuck Lever67c6d102008-12-05 19:02:45 -0500393 kfree(nsm);
394 }
395}
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 * XDR functions for NSM.
Chuck Lever2ca77542008-03-14 14:26:01 -0400399 *
400 * See http://www.opengroup.org/ for details on the Network
401 * Status Monitor wire protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 */
403
Chuck Lever49b17002010-12-14 14:58:30 +0000404static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
Chuck Lever099bd052008-03-14 14:25:32 -0400405{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500406 const u32 len = strlen(string);
407 __be32 *p;
Chuck Lever099bd052008-03-14 14:25:32 -0400408
Chuck Lever49b17002010-12-14 14:58:30 +0000409 BUG_ON(len > SM_MAXSTRLEN);
410 p = xdr_reserve_space(xdr, 4 + len);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500411 xdr_encode_opaque(p, string, len);
Chuck Lever099bd052008-03-14 14:25:32 -0400412}
413
Chuck Lever49695172008-03-14 14:25:39 -0400414/*
415 * "mon_name" specifies the host to be monitored.
Chuck Lever49695172008-03-14 14:25:39 -0400416 */
Chuck Lever49b17002010-12-14 14:58:30 +0000417static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever49695172008-03-14 14:25:39 -0400418{
Chuck Lever49b17002010-12-14 14:58:30 +0000419 encode_nsm_string(xdr, argp->mon_name);
Chuck Lever49695172008-03-14 14:25:39 -0400420}
421
Chuck Lever850c95f2008-03-14 14:25:46 -0400422/*
423 * The "my_id" argument specifies the hostname and RPC procedure
424 * to be called when the status manager receives notification
Chuck Lever36e8e662008-12-05 19:02:07 -0500425 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
Chuck Lever850c95f2008-03-14 14:25:46 -0400426 * has changed.
427 */
Chuck Lever49b17002010-12-14 14:58:30 +0000428static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever850c95f2008-03-14 14:25:46 -0400429{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500430 __be32 *p;
Chuck Lever850c95f2008-03-14 14:25:46 -0400431
Chuck Lever49b17002010-12-14 14:58:30 +0000432 encode_nsm_string(xdr, utsname()->nodename);
433 p = xdr_reserve_space(xdr, 4 + 4 + 4);
434 *p++ = cpu_to_be32(argp->prog);
435 *p++ = cpu_to_be32(argp->vers);
436 *p = cpu_to_be32(argp->proc);
Chuck Lever850c95f2008-03-14 14:25:46 -0400437}
438
Chuck Leverea72a7f2008-03-14 14:25:53 -0400439/*
440 * The "mon_id" argument specifies the non-private arguments
Chuck Lever36e8e662008-12-05 19:02:07 -0500441 * of an NSMPROC_MON or NSMPROC_UNMON call.
Chuck Leverea72a7f2008-03-14 14:25:53 -0400442 */
Chuck Lever49b17002010-12-14 14:58:30 +0000443static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Leverea72a7f2008-03-14 14:25:53 -0400444{
Chuck Lever49b17002010-12-14 14:58:30 +0000445 encode_mon_name(xdr, argp);
446 encode_my_id(xdr, argp);
Chuck Leverea72a7f2008-03-14 14:25:53 -0400447}
448
Chuck Lever0490a542008-03-14 14:26:08 -0400449/*
450 * The "priv" argument may contain private information required
Chuck Lever36e8e662008-12-05 19:02:07 -0500451 * by the NSMPROC_MON call. This information will be supplied in the
452 * NLMPROC_SM_NOTIFY call.
Chuck Lever0490a542008-03-14 14:26:08 -0400453 */
Chuck Lever49b17002010-12-14 14:58:30 +0000454static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever0490a542008-03-14 14:26:08 -0400455{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500456 __be32 *p;
457
458 p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
Chuck Levercab2d3c2008-12-05 19:03:24 -0500459 xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460}
461
Chuck Lever9f06c712010-12-14 14:59:18 +0000462static void nsm_xdr_enc_mon(struct rpc_rqst *req, struct xdr_stream *xdr,
463 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Chuck Lever9f06c712010-12-14 14:59:18 +0000465 encode_mon_id(xdr, argp);
466 encode_priv(xdr, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467}
468
Chuck Lever9f06c712010-12-14 14:59:18 +0000469static void nsm_xdr_enc_unmon(struct rpc_rqst *req, struct xdr_stream *xdr,
470 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
Chuck Lever9f06c712010-12-14 14:59:18 +0000472 encode_mon_id(xdr, argp);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500473}
474
Chuck Leverbf269552010-12-14 14:59:29 +0000475static int nsm_xdr_dec_stat_res(struct rpc_rqst *rqstp,
476 struct xdr_stream *xdr,
477 struct nsm_res *resp)
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500478{
Chuck Leverbf269552010-12-14 14:59:29 +0000479 __be32 *p;
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500480
Chuck Leverbf269552010-12-14 14:59:29 +0000481 p = xdr_inline_decode(xdr, 4 + 4);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500482 if (unlikely(p == NULL))
483 return -EIO;
Chuck Lever49b17002010-12-14 14:58:30 +0000484 resp->status = be32_to_cpup(p++);
485 resp->state = be32_to_cpup(p);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500486
Chuck Leverbf269552010-12-14 14:59:29 +0000487 dprintk("lockd: %s status %d state %d\n",
488 __func__, resp->status, resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 return 0;
490}
491
Chuck Leverbf269552010-12-14 14:59:29 +0000492static int nsm_xdr_dec_stat(struct rpc_rqst *rqstp,
493 struct xdr_stream *xdr,
494 struct nsm_res *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
Chuck Leverbf269552010-12-14 14:59:29 +0000496 __be32 *p;
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500497
Chuck Leverbf269552010-12-14 14:59:29 +0000498 p = xdr_inline_decode(xdr, 4);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500499 if (unlikely(p == NULL))
500 return -EIO;
Chuck Lever49b17002010-12-14 14:58:30 +0000501 resp->state = be32_to_cpup(p);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500502
Chuck Leverbf269552010-12-14 14:59:29 +0000503 dprintk("lockd: %s state %d\n", __func__, resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 return 0;
505}
506
507#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
Chuck Lever2ca77542008-03-14 14:26:01 -0400508#define SM_my_id_sz (SM_my_name_sz+3)
509#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
510#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
Chuck Lever0490a542008-03-14 14:26:08 -0400511#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
512#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513#define SM_monres_sz 2
514#define SM_unmonres_sz 1
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516static struct rpc_procinfo nsm_procedures[] = {
Chuck Lever36e8e662008-12-05 19:02:07 -0500517[NSMPROC_MON] = {
518 .p_proc = NSMPROC_MON,
Chuck Lever9f06c712010-12-14 14:59:18 +0000519 .p_encode = (kxdreproc_t)nsm_xdr_enc_mon,
Chuck Leverbf269552010-12-14 14:59:29 +0000520 .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat_res,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400521 .p_arglen = SM_mon_sz,
522 .p_replen = SM_monres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500523 .p_statidx = NSMPROC_MON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500524 .p_name = "MONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 },
Chuck Lever36e8e662008-12-05 19:02:07 -0500526[NSMPROC_UNMON] = {
527 .p_proc = NSMPROC_UNMON,
Chuck Lever9f06c712010-12-14 14:59:18 +0000528 .p_encode = (kxdreproc_t)nsm_xdr_enc_unmon,
Chuck Leverbf269552010-12-14 14:59:29 +0000529 .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400530 .p_arglen = SM_mon_id_sz,
531 .p_replen = SM_unmonres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500532 .p_statidx = NSMPROC_UNMON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500533 .p_name = "UNMONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 },
535};
536
537static struct rpc_version nsm_version1 = {
Tobias Klausere8c96f82006-03-24 03:15:34 -0800538 .number = 1,
539 .nrprocs = ARRAY_SIZE(nsm_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 .procs = nsm_procedures
541};
542
543static struct rpc_version * nsm_version[] = {
544 [1] = &nsm_version1,
545};
546
547static struct rpc_stat nsm_stats;
548
549static struct rpc_program nsm_program = {
550 .name = "statd",
Chuck Lever36e8e662008-12-05 19:02:07 -0500551 .number = NSM_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800552 .nrvers = ARRAY_SIZE(nsm_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 .version = nsm_version,
554 .stats = &nsm_stats
555};