blob: fefa4df3f005bd9cdf0e1a10b0ab0bfce72f976e [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>
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sunrpc/clnt.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040015#include <linux/sunrpc/xprtsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/sunrpc/svc.h>
17#include <linux/lockd/lockd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Mans Rullgardad5b3652009-03-28 19:55:20 +000019#include <asm/unaligned.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#define NLMDBG_FACILITY NLMDBG_MONITOR
Chuck Lever36e8e662008-12-05 19:02:07 -050022#define NSM_PROGRAM 100024
23#define NSM_VERSION 1
24
25enum {
26 NSMPROC_NULL,
27 NSMPROC_STAT,
28 NSMPROC_MON,
29 NSMPROC_UNMON,
30 NSMPROC_UNMON_ALL,
31 NSMPROC_SIMU_CRASH,
32 NSMPROC_NOTIFY,
33};
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Chuck Lever9c1bfd02008-12-05 19:01:59 -050035struct nsm_args {
Chuck Levercab2d3c2008-12-05 19:03:24 -050036 struct nsm_private *priv;
Chuck Lever9c1bfd02008-12-05 19:01:59 -050037 u32 prog; /* RPC callback info */
38 u32 vers;
39 u32 proc;
40
41 char *mon_name;
42};
43
44struct nsm_res {
45 u32 status;
46 u32 state;
47};
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static struct rpc_program nsm_program;
Chuck Lever67c6d102008-12-05 19:02:45 -050050static LIST_HEAD(nsm_handles);
51static DEFINE_SPINLOCK(nsm_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/*
54 * Local NSM state
55 */
Chuck Lever6c9dc422009-06-17 18:02:10 -070056u32 __read_mostly nsm_local_state;
Chuck Leverb7ba5972008-12-11 17:56:29 -050057int __read_mostly nsm_use_hostnames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Chuck Lever8529bc52008-12-11 17:56:22 -050059static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
60{
61 return (struct sockaddr *)&nsm->sm_addr;
62}
63
Chuck Lever49b56992008-12-11 17:56:37 -050064static struct rpc_clnt *nsm_create(void)
65{
66 struct sockaddr_in sin = {
67 .sin_family = AF_INET,
68 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
69 };
70 struct rpc_create_args args = {
71 .protocol = XPRT_TRANSPORT_UDP,
72 .address = (struct sockaddr *)&sin,
73 .addrsize = sizeof(sin),
74 .servername = "rpc.statd",
75 .program = &nsm_program,
76 .version = NSM_VERSION,
77 .authflavor = RPC_AUTH_NULL,
Chuck Lever0e5c2632009-06-17 18:02:11 -070078 .flags = RPC_CLNT_CREATE_NOPING,
Chuck Lever49b56992008-12-11 17:56:37 -050079 };
80
81 return rpc_create(&args);
82}
83
84static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
86 struct rpc_clnt *clnt;
87 int status;
Chuck Levera4846752008-12-04 14:20:23 -050088 struct nsm_args args = {
Chuck Levercab2d3c2008-12-05 19:03:24 -050089 .priv = &nsm->sm_priv,
Chuck Levera4846752008-12-04 14:20:23 -050090 .prog = NLM_PROGRAM,
91 .vers = 3,
92 .proc = NLMPROC_NSM_NOTIFY,
Chuck Lever29ed1402008-12-04 14:20:46 -050093 .mon_name = nsm->sm_mon_name,
Chuck Levera4846752008-12-04 14:20:23 -050094 };
Chuck Leverdead28d2006-03-20 13:44:23 -050095 struct rpc_message msg = {
96 .rpc_argp = &args,
97 .rpc_resp = res,
98 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 clnt = nsm_create();
101 if (IS_ERR(clnt)) {
102 status = PTR_ERR(clnt);
Chuck Lever5acf4312008-12-04 14:20:31 -0500103 dprintk("lockd: failed to create NSM upcall transport, "
104 "status=%d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 goto out;
106 }
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 memset(res, 0, sizeof(*res));
109
Chuck Leverdead28d2006-03-20 13:44:23 -0500110 msg.rpc_proc = &clnt->cl_procinfo[proc];
111 status = rpc_call_sync(clnt, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (status < 0)
Chuck Lever5acf4312008-12-04 14:20:31 -0500113 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
114 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 else
116 status = 0;
Trond Myklebust90c57552007-06-09 19:49:36 -0400117 rpc_shutdown_client(clnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 out:
119 return status;
120}
121
Chuck Lever1e49323c2008-12-04 14:21:24 -0500122/**
123 * nsm_monitor - Notify a peer in case we reboot
124 * @host: pointer to nlm_host of peer to notify
125 *
126 * If this peer is not already monitored, this function sends an
127 * upcall to the local rpc.statd to record the name/address of
128 * the peer to notify in case we reboot.
129 *
130 * Returns zero if the peer is monitored by the local rpc.statd;
131 * otherwise a negative errno value is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 */
Chuck Lever1e49323c2008-12-04 14:21:24 -0500133int nsm_monitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700135 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 struct nsm_res res;
137 int status;
138
Chuck Lever9fee4902008-12-04 14:20:53 -0500139 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700140
141 if (nsm->sm_monitored)
Olaf Kirch977faf32006-10-04 02:15:51 -0700142 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Chuck Lever29ed1402008-12-04 14:20:46 -0500144 /*
145 * Choose whether to record the caller_name or IP address of
146 * this peer in the local rpc.statd's database.
147 */
148 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
149
Chuck Lever36e8e662008-12-05 19:02:07 -0500150 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700151 if (unlikely(res.status != 0))
Chuck Lever5d254b12008-12-04 14:21:15 -0500152 status = -EIO;
Chuck Lever6c9dc422009-06-17 18:02:10 -0700153 if (unlikely(status < 0)) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500154 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700155 return status;
156 }
157
158 nsm->sm_monitored = 1;
159 if (unlikely(nsm_local_state != res.state)) {
160 nsm_local_state = res.state;
161 dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
162 }
163 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Chuck Lever356c3eb2008-12-04 14:21:38 -0500166/**
167 * nsm_unmonitor - Unregister peer notification
168 * @host: pointer to nlm_host of peer to stop monitoring
169 *
170 * If this peer is monitored, this function sends an upcall to
171 * tell the local rpc.statd not to send this peer a notification
172 * when we reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 */
Chuck Lever356c3eb2008-12-04 14:21:38 -0500174void nsm_unmonitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700176 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 struct nsm_res res;
Chuck Lever356c3eb2008-12-04 14:21:38 -0500178 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Olaf Kirch9502c522006-10-04 02:15:56 -0700180 if (atomic_read(&nsm->sm_count) == 1
181 && nsm->sm_monitored && !nsm->sm_sticky) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500182 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700183
Chuck Lever36e8e662008-12-05 19:02:07 -0500184 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
Chuck Lever0c7aef42008-12-04 14:21:46 -0500185 if (res.status != 0)
186 status = -EIO;
Olaf Kirch977faf32006-10-04 02:15:51 -0700187 if (status < 0)
Olaf Kirch9502c522006-10-04 02:15:56 -0700188 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
Chuck Lever9fee4902008-12-04 14:20:53 -0500189 nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700190 else
191 nsm->sm_monitored = 0;
Olaf Kirch977faf32006-10-04 02:15:51 -0700192 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Chuck Lever3420a8c2008-12-05 19:03:46 -0500195static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
196 const size_t len)
197{
198 struct nsm_handle *nsm;
199
200 list_for_each_entry(nsm, &nsm_handles, sm_link)
201 if (strlen(nsm->sm_name) == len &&
202 memcmp(nsm->sm_name, hostname, len) == 0)
203 return nsm;
204 return NULL;
205}
206
Chuck Lever77a3ef32008-12-11 17:55:59 -0500207static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
208{
209 struct nsm_handle *nsm;
210
211 list_for_each_entry(nsm, &nsm_handles, sm_link)
Jeff Layton4516fc02009-08-14 12:57:54 -0400212 if (rpc_cmp_addr(nsm_addr(nsm), sap))
Chuck Lever77a3ef32008-12-11 17:55:59 -0500213 return nsm;
214 return NULL;
215}
216
Chuck Lever3420a8c2008-12-05 19:03:46 -0500217static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
218{
219 struct nsm_handle *nsm;
220
221 list_for_each_entry(nsm, &nsm_handles, sm_link)
222 if (memcmp(nsm->sm_priv.data, priv->data,
223 sizeof(priv->data)) == 0)
224 return nsm;
225 return NULL;
226}
227
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500228/*
229 * Construct a unique cookie to match this nsm_handle to this monitored
230 * host. It is passed to the local rpc.statd via NSMPROC_MON, and
231 * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
232 * requests.
233 *
Chuck Lever94da7662008-12-11 17:56:07 -0500234 * The NSM protocol requires that these cookies be unique while the
235 * system is running. We prefer a stronger requirement of making them
236 * unique across reboots. If user space bugs cause a stale cookie to
237 * be sent to the kernel, it could cause the wrong host to lose its
238 * lock state if cookies were not unique across reboots.
239 *
240 * The cookies are exposed only to local user space via loopback. They
241 * do not appear on the physical network. If we want greater security
242 * for some reason, nsm_init_private() could perform a one-way hash to
243 * obscure the contents of the cookie.
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500244 */
245static void nsm_init_private(struct nsm_handle *nsm)
246{
Chuck Lever94da7662008-12-11 17:56:07 -0500247 u64 *p = (u64 *)&nsm->sm_priv.data;
248 struct timespec ts;
Mans Rullgardad5b3652009-03-28 19:55:20 +0000249 s64 ns;
Chuck Lever94da7662008-12-11 17:56:07 -0500250
251 ktime_get_ts(&ts);
Mans Rullgardad5b3652009-03-28 19:55:20 +0000252 ns = timespec_to_ns(&ts);
253 put_unaligned(ns, p);
254 put_unaligned((unsigned long)nsm, p + 1);
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500255}
256
Chuck Leverb39b8972008-12-11 17:55:52 -0500257static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
258 const size_t salen,
259 const char *hostname,
260 const size_t hostname_len)
261{
262 struct nsm_handle *new;
263
264 new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
265 if (unlikely(new == NULL))
266 return NULL;
267
268 atomic_set(&new->sm_count, 1);
269 new->sm_name = (char *)(new + 1);
270 memcpy(nsm_addr(new), sap, salen);
271 new->sm_addrlen = salen;
272 nsm_init_private(new);
Chuck Leverc15128c2009-08-09 15:09:39 -0400273
274 if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
275 sizeof(new->sm_addrbuf)) == 0)
276 (void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
277 "unsupported address family");
Chuck Leverb39b8972008-12-11 17:55:52 -0500278 memcpy(new->sm_name, hostname, hostname_len);
279 new->sm_name[hostname_len] = '\0';
280
281 return new;
282}
283
Chuck Lever67c6d102008-12-05 19:02:45 -0500284/**
Chuck Lever92fd91b2008-12-05 19:04:01 -0500285 * nsm_get_handle - Find or create a cached nsm_handle
Chuck Lever67c6d102008-12-05 19:02:45 -0500286 * @sap: pointer to socket address of handle to find
287 * @salen: length of socket address
288 * @hostname: pointer to C string containing hostname to find
289 * @hostname_len: length of C string
Chuck Lever67c6d102008-12-05 19:02:45 -0500290 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500291 * Behavior is modulated by the global nsm_use_hostnames variable.
Chuck Lever67c6d102008-12-05 19:02:45 -0500292 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500293 * Returns a cached nsm_handle after bumping its ref count, or
294 * returns a fresh nsm_handle if a handle that matches @sap and/or
295 * @hostname cannot be found in the handle cache. Returns NULL if
296 * an error occurs.
Chuck Lever67c6d102008-12-05 19:02:45 -0500297 */
Chuck Lever92fd91b2008-12-05 19:04:01 -0500298struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
299 const size_t salen, const char *hostname,
300 const size_t hostname_len)
Chuck Lever67c6d102008-12-05 19:02:45 -0500301{
Chuck Lever77a3ef32008-12-11 17:55:59 -0500302 struct nsm_handle *cached, *new = NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500303
Chuck Lever67c6d102008-12-05 19:02:45 -0500304 if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
305 if (printk_ratelimit()) {
306 printk(KERN_WARNING "Invalid hostname \"%.*s\" "
307 "in NFS lock request\n",
308 (int)hostname_len, hostname);
309 }
310 return NULL;
311 }
312
313retry:
314 spin_lock(&nsm_lock);
Chuck Lever67c6d102008-12-05 19:02:45 -0500315
Chuck Lever77a3ef32008-12-11 17:55:59 -0500316 if (nsm_use_hostnames && hostname != NULL)
317 cached = nsm_lookup_hostname(hostname, hostname_len);
318 else
319 cached = nsm_lookup_addr(sap);
320
321 if (cached != NULL) {
322 atomic_inc(&cached->sm_count);
323 spin_unlock(&nsm_lock);
324 kfree(new);
325 dprintk("lockd: found nsm_handle for %s (%s), "
326 "cnt %d\n", cached->sm_name,
327 cached->sm_addrbuf,
328 atomic_read(&cached->sm_count));
329 return cached;
Chuck Lever67c6d102008-12-05 19:02:45 -0500330 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500331
332 if (new != NULL) {
333 list_add(&new->sm_link, &nsm_handles);
334 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500335 dprintk("lockd: created nsm_handle for %s (%s)\n",
Chuck Lever77a3ef32008-12-11 17:55:59 -0500336 new->sm_name, new->sm_addrbuf);
337 return new;
Chuck Lever67c6d102008-12-05 19:02:45 -0500338 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500339
Chuck Lever67c6d102008-12-05 19:02:45 -0500340 spin_unlock(&nsm_lock);
341
Chuck Lever77a3ef32008-12-11 17:55:59 -0500342 new = nsm_create_handle(sap, salen, hostname, hostname_len);
343 if (unlikely(new == NULL))
Chuck Lever67c6d102008-12-05 19:02:45 -0500344 return NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500345 goto retry;
Chuck Lever67c6d102008-12-05 19:02:45 -0500346}
347
348/**
Chuck Lever3420a8c2008-12-05 19:03:46 -0500349 * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
350 * @info: pointer to NLMPROC_SM_NOTIFY arguments
351 *
Jeff Layton7e469af2010-02-05 15:09:22 -0500352 * Returns a matching nsm_handle if found in the nsm cache. The returned
353 * nsm_handle's reference count is bumped. Otherwise returns NULL if some
354 * error occurred.
Chuck Lever3420a8c2008-12-05 19:03:46 -0500355 */
356struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
357{
358 struct nsm_handle *cached;
359
360 spin_lock(&nsm_lock);
361
Chuck Lever94da7662008-12-11 17:56:07 -0500362 cached = nsm_lookup_priv(&info->priv);
Chuck Lever3420a8c2008-12-05 19:03:46 -0500363 if (unlikely(cached == NULL)) {
364 spin_unlock(&nsm_lock);
365 dprintk("lockd: never saw rebooted peer '%.*s' before\n",
366 info->len, info->mon);
367 return cached;
368 }
369
370 atomic_inc(&cached->sm_count);
371 spin_unlock(&nsm_lock);
372
Chuck Lever3420a8c2008-12-05 19:03:46 -0500373 dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
374 cached->sm_name, cached->sm_addrbuf,
375 atomic_read(&cached->sm_count));
376 return cached;
377}
378
379/**
Chuck Lever67c6d102008-12-05 19:02:45 -0500380 * nsm_release - Release an NSM handle
381 * @nsm: pointer to handle to be released
382 *
383 */
384void nsm_release(struct nsm_handle *nsm)
385{
Chuck Lever67c6d102008-12-05 19:02:45 -0500386 if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
387 list_del(&nsm->sm_link);
388 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500389 dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
390 nsm->sm_name, nsm->sm_addrbuf);
Chuck Lever67c6d102008-12-05 19:02:45 -0500391 kfree(nsm);
392 }
393}
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 * XDR functions for NSM.
Chuck Lever2ca77542008-03-14 14:26:01 -0400397 *
398 * See http://www.opengroup.org/ for details on the Network
399 * Status Monitor wire protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 */
401
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500402static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
Chuck Lever099bd052008-03-14 14:25:32 -0400403{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500404 const u32 len = strlen(string);
405 __be32 *p;
Chuck Lever099bd052008-03-14 14:25:32 -0400406
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500407 if (unlikely(len > SM_MAXSTRLEN))
408 return -EIO;
409 p = xdr_reserve_space(xdr, sizeof(u32) + len);
410 if (unlikely(p == NULL))
411 return -EIO;
412 xdr_encode_opaque(p, string, len);
413 return 0;
Chuck Lever099bd052008-03-14 14:25:32 -0400414}
415
Chuck Lever49695172008-03-14 14:25:39 -0400416/*
417 * "mon_name" specifies the host to be monitored.
Chuck Lever49695172008-03-14 14:25:39 -0400418 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500419static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever49695172008-03-14 14:25:39 -0400420{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500421 return encode_nsm_string(xdr, argp->mon_name);
Chuck Lever49695172008-03-14 14:25:39 -0400422}
423
Chuck Lever850c95f2008-03-14 14:25:46 -0400424/*
425 * The "my_id" argument specifies the hostname and RPC procedure
426 * to be called when the status manager receives notification
Chuck Lever36e8e662008-12-05 19:02:07 -0500427 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
Chuck Lever850c95f2008-03-14 14:25:46 -0400428 * has changed.
429 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500430static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever850c95f2008-03-14 14:25:46 -0400431{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500432 int status;
433 __be32 *p;
Chuck Lever850c95f2008-03-14 14:25:46 -0400434
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500435 status = encode_nsm_string(xdr, utsname()->nodename);
436 if (unlikely(status != 0))
437 return status;
438 p = xdr_reserve_space(xdr, 3 * sizeof(u32));
439 if (unlikely(p == NULL))
440 return -EIO;
Chuck Lever850c95f2008-03-14 14:25:46 -0400441 *p++ = htonl(argp->prog);
442 *p++ = htonl(argp->vers);
443 *p++ = htonl(argp->proc);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500444 return 0;
Chuck Lever850c95f2008-03-14 14:25:46 -0400445}
446
Chuck Leverea72a7f2008-03-14 14:25:53 -0400447/*
448 * The "mon_id" argument specifies the non-private arguments
Chuck Lever36e8e662008-12-05 19:02:07 -0500449 * of an NSMPROC_MON or NSMPROC_UNMON call.
Chuck Leverea72a7f2008-03-14 14:25:53 -0400450 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500451static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Leverea72a7f2008-03-14 14:25:53 -0400452{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500453 int status;
Chuck Leverea72a7f2008-03-14 14:25:53 -0400454
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500455 status = encode_mon_name(xdr, argp);
456 if (unlikely(status != 0))
457 return status;
458 return encode_my_id(xdr, argp);
Chuck Leverea72a7f2008-03-14 14:25:53 -0400459}
460
Chuck Lever0490a542008-03-14 14:26:08 -0400461/*
462 * The "priv" argument may contain private information required
Chuck Lever36e8e662008-12-05 19:02:07 -0500463 * by the NSMPROC_MON call. This information will be supplied in the
464 * NLMPROC_SM_NOTIFY call.
Chuck Lever0490a542008-03-14 14:26:08 -0400465 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500466static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever0490a542008-03-14 14:26:08 -0400467{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500468 __be32 *p;
469
470 p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
471 if (unlikely(p == NULL))
472 return -EIO;
Chuck Levercab2d3c2008-12-05 19:03:24 -0500473 xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 return 0;
475}
476
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500477static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
478 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500480 struct xdr_stream xdr;
481 int status;
482
483 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
484 status = encode_mon_id(&xdr, argp);
485 if (unlikely(status))
486 return status;
487 return encode_priv(&xdr, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500490static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
491 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500493 struct xdr_stream xdr;
494
495 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
496 return encode_mon_id(&xdr, argp);
497}
498
499static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
500 struct nsm_res *resp)
501{
502 struct xdr_stream xdr;
503
504 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
505 p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
506 if (unlikely(p == NULL))
507 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 resp->status = ntohl(*p++);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500509 resp->state = ntohl(*p);
510
511 dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 resp->status, resp->state);
513 return 0;
514}
515
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500516static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
517 struct nsm_res *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500519 struct xdr_stream xdr;
520
521 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
522 p = xdr_inline_decode(&xdr, sizeof(u32));
523 if (unlikely(p == NULL))
524 return -EIO;
525 resp->state = ntohl(*p);
526
527 dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 return 0;
529}
530
531#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
Chuck Lever2ca77542008-03-14 14:26:01 -0400532#define SM_my_id_sz (SM_my_name_sz+3)
533#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
534#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
Chuck Lever0490a542008-03-14 14:26:08 -0400535#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
536#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537#define SM_monres_sz 2
538#define SM_unmonres_sz 1
539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540static struct rpc_procinfo nsm_procedures[] = {
Chuck Lever36e8e662008-12-05 19:02:07 -0500541[NSMPROC_MON] = {
542 .p_proc = NSMPROC_MON,
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500543 .p_encode = (kxdrproc_t)xdr_enc_mon,
544 .p_decode = (kxdrproc_t)xdr_dec_stat_res,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400545 .p_arglen = SM_mon_sz,
546 .p_replen = SM_monres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500547 .p_statidx = NSMPROC_MON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500548 .p_name = "MONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 },
Chuck Lever36e8e662008-12-05 19:02:07 -0500550[NSMPROC_UNMON] = {
551 .p_proc = NSMPROC_UNMON,
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500552 .p_encode = (kxdrproc_t)xdr_enc_unmon,
553 .p_decode = (kxdrproc_t)xdr_dec_stat,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400554 .p_arglen = SM_mon_id_sz,
555 .p_replen = SM_unmonres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500556 .p_statidx = NSMPROC_UNMON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500557 .p_name = "UNMONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 },
559};
560
561static struct rpc_version nsm_version1 = {
Tobias Klausere8c96f82006-03-24 03:15:34 -0800562 .number = 1,
563 .nrprocs = ARRAY_SIZE(nsm_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 .procs = nsm_procedures
565};
566
567static struct rpc_version * nsm_version[] = {
568 [1] = &nsm_version1,
569};
570
571static struct rpc_stat nsm_stats;
572
573static struct rpc_program nsm_program = {
574 .name = "statd",
Chuck Lever36e8e662008-12-05 19:02:07 -0500575 .number = NSM_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800576 .nrvers = ARRAY_SIZE(nsm_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 .version = nsm_version,
578 .stats = &nsm_stats
579};