1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
4 *
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <andros@umich.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35 #ifndef _NFSD4_STATE_H
36 #define _NFSD4_STATE_H
37
38 #include <linux/sunrpc/svc_xprt.h>
39 #include <linux/nfsd/nfsfh.h>
40 #include "nfsfh.h"
41
42 typedef struct {
43 u32 cl_boot;
44 u32 cl_id;
45 } clientid_t;
46
47 typedef struct {
48 u32 so_boot;
49 u32 so_stateownerid;
50 u32 so_fileid;
51 } stateid_opaque_t;
52
53 typedef struct {
54 u32 si_generation;
55 stateid_opaque_t si_opaque;
56 } stateid_t;
57 #define si_boot si_opaque.so_boot
58 #define si_stateownerid si_opaque.so_stateownerid
59 #define si_fileid si_opaque.so_fileid
60
61 #define STATEID_FMT "(%08x/%08x/%08x/%08x)"
62 #define STATEID_VAL(s) \
63 (s)->si_boot, \
64 (s)->si_stateownerid, \
65 (s)->si_fileid, \
66 (s)->si_generation
67
68 struct nfsd4_callback {
69 void *cb_op;
70 struct nfs4_client *cb_clp;
71 struct list_head cb_per_client;
72 u32 cb_minorversion;
73 struct rpc_message cb_msg;
74 const struct rpc_call_ops *cb_ops;
75 struct work_struct cb_work;
76 bool cb_done;
77 };
78
79 struct nfs4_delegation {
80 struct list_head dl_perfile;
81 struct list_head dl_perclnt;
82 struct list_head dl_recall_lru; /* delegation recalled */
83 atomic_t dl_count; /* ref count */
84 struct nfs4_client *dl_client;
85 struct nfs4_file *dl_file;
86 u32 dl_type;
87 time_t dl_time;
88 /* For recall: */
89 stateid_t dl_stateid;
90 struct knfsd_fh dl_fh;
91 int dl_retries;
92 struct nfsd4_callback dl_recall;
93 };
94
95 /* client delegation callback info */
96 struct nfs4_cb_conn {
97 /* SETCLIENTID info */
98 struct sockaddr_storage cb_addr;
99 struct sockaddr_storage cb_saddr;
100 size_t cb_addrlen;
101 u32 cb_prog; /* used only in 4.0 case;
102 per-session otherwise */
103 u32 cb_ident; /* minorversion 0 only */
104 struct svc_xprt *cb_xprt; /* minorversion 1 only */
105 };
106
107 /* Maximum number of slots per session. 160 is useful for long haul TCP */
108 #define NFSD_MAX_SLOTS_PER_SESSION 160
109 /* Maximum number of operations per session compound */
110 #define NFSD_MAX_OPS_PER_COMPOUND 16
111 /* Maximum session per slot cache size */
112 #define NFSD_SLOT_CACHE_SIZE 1024
113 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
114 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
115 #define NFSD_MAX_MEM_PER_SESSION \
116 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
117
118 struct nfsd4_slot {
119 bool sl_inuse;
120 bool sl_cachethis;
121 u16 sl_opcnt;
122 u32 sl_seqid;
123 __be32 sl_status;
124 u32 sl_datalen;
125 char sl_data[];
126 };
127
128 struct nfsd4_channel_attrs {
129 u32 headerpadsz;
130 u32 maxreq_sz;
131 u32 maxresp_sz;
132 u32 maxresp_cached;
133 u32 maxops;
134 u32 maxreqs;
135 u32 nr_rdma_attrs;
136 u32 rdma_attrs;
137 };
138
139 struct nfsd4_create_session {
140 clientid_t clientid;
141 struct nfs4_sessionid sessionid;
142 u32 seqid;
143 u32 flags;
144 struct nfsd4_channel_attrs fore_channel;
145 struct nfsd4_channel_attrs back_channel;
146 u32 callback_prog;
147 u32 uid;
148 u32 gid;
149 };
150
151 struct nfsd4_bind_conn_to_session {
152 struct nfs4_sessionid sessionid;
153 u32 dir;
154 };
155
156 /* The single slot clientid cache structure */
157 struct nfsd4_clid_slot {
158 u32 sl_seqid;
159 __be32 sl_status;
160 struct nfsd4_create_session sl_cr_ses;
161 };
162
163 struct nfsd4_conn {
164 struct list_head cn_persession;
165 struct svc_xprt *cn_xprt;
166 struct svc_xpt_user cn_xpt_user;
167 struct nfsd4_session *cn_session;
168 /* CDFC4_FORE, CDFC4_BACK: */
169 unsigned char cn_flags;
170 };
171
172 struct nfsd4_session {
173 struct kref se_ref;
174 struct list_head se_hash; /* hash by sessionid */
175 struct list_head se_perclnt;
176 u32 se_flags;
177 struct nfs4_client *se_client;
178 struct nfs4_sessionid se_sessionid;
179 struct nfsd4_channel_attrs se_fchannel;
180 struct nfsd4_channel_attrs se_bchannel;
181 struct list_head se_conns;
182 u32 se_cb_prog;
183 u32 se_cb_seq_nr;
184 struct nfsd4_slot *se_slots[]; /* forward channel slots */
185 };
186
187 static inline void
nfsd4_put_session(struct nfsd4_session * ses)188 nfsd4_put_session(struct nfsd4_session *ses)
189 {
190 extern void free_session(struct kref *kref);
191 kref_put(&ses->se_ref, free_session);
192 }
193
194 static inline void
nfsd4_get_session(struct nfsd4_session * ses)195 nfsd4_get_session(struct nfsd4_session *ses)
196 {
197 kref_get(&ses->se_ref);
198 }
199
200 /* formatted contents of nfs4_sessionid */
201 struct nfsd4_sessionid {
202 clientid_t clientid;
203 u32 sequence;
204 u32 reserved;
205 };
206
207 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
208
209 /*
210 * struct nfs4_client - one per client. Clientids live here.
211 * o Each nfs4_client is hashed by clientid.
212 *
213 * o Each nfs4_clients is also hashed by name
214 * (the opaque quantity initially sent by the client to identify itself).
215 *
216 * o cl_perclient list is used to ensure no dangling stateowner references
217 * when we expire the nfs4_client
218 */
219 struct nfs4_client {
220 struct list_head cl_idhash; /* hash by cl_clientid.id */
221 struct list_head cl_strhash; /* hash by cl_name */
222 struct list_head cl_openowners;
223 struct list_head cl_delegations;
224 struct list_head cl_lru; /* tail queue */
225 struct xdr_netobj cl_name; /* id generated by client */
226 char cl_recdir[HEXDIR_LEN]; /* recovery dir */
227 nfs4_verifier cl_verifier; /* generated by client */
228 time_t cl_time; /* time of last lease renewal */
229 struct sockaddr_storage cl_addr; /* client ipaddress */
230 u32 cl_flavor; /* setclientid pseudoflavor */
231 char *cl_principal; /* setclientid principal name */
232 struct svc_cred cl_cred; /* setclientid principal */
233 clientid_t cl_clientid; /* generated by server */
234 nfs4_verifier cl_confirm; /* generated by server */
235 u32 cl_firststate; /* recovery dir creation */
236 u32 cl_minorversion;
237
238 /* for v4.0 and v4.1 callbacks: */
239 struct nfs4_cb_conn cl_cb_conn;
240 #define NFSD4_CLIENT_CB_UPDATE 1
241 #define NFSD4_CLIENT_KILL 2
242 unsigned long cl_cb_flags;
243 struct rpc_clnt *cl_cb_client;
244 u32 cl_cb_ident;
245 #define NFSD4_CB_UP 0
246 #define NFSD4_CB_UNKNOWN 1
247 #define NFSD4_CB_DOWN 2
248 int cl_cb_state;
249 struct nfsd4_callback cl_cb_null;
250 struct nfsd4_session *cl_cb_session;
251 struct list_head cl_callbacks; /* list of in-progress callbacks */
252
253 /* for all client information that callback code might need: */
254 spinlock_t cl_lock;
255
256 /* for nfs41 */
257 struct list_head cl_sessions;
258 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
259 u32 cl_exchange_flags;
260 /* number of rpc's in progress over an associated session: */
261 atomic_t cl_refcount;
262
263 /* for nfs41 callbacks */
264 /* We currently support a single back channel with a single slot */
265 unsigned long cl_cb_slot_busy;
266 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
267 /* wait here for slots */
268 };
269
270 static inline void
mark_client_expired(struct nfs4_client * clp)271 mark_client_expired(struct nfs4_client *clp)
272 {
273 clp->cl_time = 0;
274 }
275
276 static inline bool
is_client_expired(struct nfs4_client * clp)277 is_client_expired(struct nfs4_client *clp)
278 {
279 return clp->cl_time == 0;
280 }
281
282 /* struct nfs4_client_reset
283 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
284 * upon lease reset, or from upcall to state_daemon (to read in state
285 * from non-volitile storage) upon reboot.
286 */
287 struct nfs4_client_reclaim {
288 struct list_head cr_strhash; /* hash by cr_name */
289 char cr_recdir[HEXDIR_LEN]; /* recover dir */
290 };
291
292 static inline void
update_stateid(stateid_t * stateid)293 update_stateid(stateid_t *stateid)
294 {
295 stateid->si_generation++;
296 }
297
298 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
299 * The OPEN response, typically the largest, requires
300 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
301 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
302 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
303 */
304
305 #define NFSD4_REPLAY_ISIZE 112
306
307 /*
308 * Replay buffer, where the result of the last seqid-mutating operation
309 * is cached.
310 */
311 struct nfs4_replay {
312 __be32 rp_status;
313 unsigned int rp_buflen;
314 char *rp_buf;
315 unsigned intrp_allocated;
316 struct knfsd_fh rp_openfh;
317 char rp_ibuf[NFSD4_REPLAY_ISIZE];
318 };
319
320 /*
321 * nfs4_stateowner can either be an open_owner, or a lock_owner
322 *
323 * so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
324 * for lock_owner
325 * so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
326 * for lock_owner
327 * so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
328 * struct is reaped.
329 * so_perfilestate: heads the list of nfs4_stateid (either open or lock)
330 * and is used to ensure no dangling nfs4_stateid references when we
331 * release a stateowner.
332 * so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
333 * close is called to reap associated byte-range locks
334 * so_close_lru: (open) stateowner is placed on this list instead of being
335 * reaped (when so_perfilestate is empty) to hold the last close replay.
336 * reaped by laundramat thread after lease period.
337 */
338 struct nfs4_stateowner {
339 struct kref so_ref;
340 struct list_head so_idhash; /* hash by so_id */
341 struct list_head so_strhash; /* hash by op_name */
342 struct list_head so_perclient;
343 struct list_head so_stateids;
344 struct list_head so_perstateid; /* for lockowners only */
345 struct list_head so_close_lru; /* tail queue */
346 time_t so_time; /* time of placement on so_close_lru */
347 int so_is_open_owner; /* 1=openowner,0=lockowner */
348 u32 so_id;
349 struct nfs4_client * so_client;
350 /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
351 * sequence id expected from the client: */
352 u32 so_seqid;
353 struct xdr_netobj so_owner; /* open owner name */
354 int so_confirmed; /* successful OPEN_CONFIRM? */
355 struct nfs4_replay so_replay;
356 };
357
358 /*
359 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
360 * o fi_perfile list is used to search for conflicting
361 * share_acces, share_deny on the file.
362 */
363 struct nfs4_file {
364 atomic_t fi_ref;
365 struct list_head fi_hash; /* hash by "struct inode *" */
366 struct list_head fi_stateids;
367 struct list_head fi_delegations;
368 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
369 struct file * fi_fds[3];
370 /*
371 * Each open or lock stateid contributes 1 to either
372 * fi_access[O_RDONLY], fi_access[O_WRONLY], or both, depending
373 * on open or lock mode:
374 */
375 atomic_t fi_access[2];
376 struct file *fi_deleg_file;
377 struct file_lock *fi_lease;
378 atomic_t fi_delegees;
379 struct inode *fi_inode;
380 u32 fi_id; /* used with stateowner->so_id
381 * for stateid_hashtbl hash */
382 bool fi_had_conflict;
383 };
384
385 /* XXX: for first cut may fall back on returning file that doesn't work
386 * at all? */
find_writeable_file(struct nfs4_file * f)387 static inline struct file *find_writeable_file(struct nfs4_file *f)
388 {
389 if (f->fi_fds[O_WRONLY])
390 return f->fi_fds[O_WRONLY];
391 return f->fi_fds[O_RDWR];
392 }
393
find_readable_file(struct nfs4_file * f)394 static inline struct file *find_readable_file(struct nfs4_file *f)
395 {
396 if (f->fi_fds[O_RDONLY])
397 return f->fi_fds[O_RDONLY];
398 return f->fi_fds[O_RDWR];
399 }
400
find_any_file(struct nfs4_file * f)401 static inline struct file *find_any_file(struct nfs4_file *f)
402 {
403 if (f->fi_fds[O_RDWR])
404 return f->fi_fds[O_RDWR];
405 else if (f->fi_fds[O_WRONLY])
406 return f->fi_fds[O_WRONLY];
407 else
408 return f->fi_fds[O_RDONLY];
409 }
410
411 /*
412 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
413 *
414 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
415 *
416 * st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
417 * st_perfile: file_hashtbl[] entry.
418 * st_perfile_state: nfs4_stateowner->so_perfilestate
419 * st_perlockowner: (open stateid) list of lock nfs4_stateowners
420 * st_access_bmap: used only for open stateid
421 * st_deny_bmap: used only for open stateid
422 * st_openstp: open stateid lock stateid was derived from
423 *
424 * XXX: open stateids and lock stateids have diverged sufficiently that
425 * we should consider defining separate structs for the two cases.
426 */
427
428 struct nfs4_stateid {
429 struct list_head st_hash;
430 struct list_head st_perfile;
431 struct list_head st_perstateowner;
432 struct list_head st_lockowners;
433 struct nfs4_stateowner * st_stateowner;
434 struct nfs4_file * st_file;
435 stateid_t st_stateid;
436 unsigned long st_access_bmap;
437 unsigned long st_deny_bmap;
438 struct nfs4_stateid * st_openstp;
439 };
440
441 /* flags for preprocess_seqid_op() */
442 #define HAS_SESSION 0x00000001
443 #define CONFIRM 0x00000002
444 #define OPEN_STATE 0x00000004
445 #define LOCK_STATE 0x00000008
446 #define RD_STATE 0x00000010
447 #define WR_STATE 0x00000020
448 #define CLOSE_STATE 0x00000040
449
450 #define seqid_mutating_err(err) \
451 (((err) != nfserr_stale_clientid) && \
452 ((err) != nfserr_bad_seqid) && \
453 ((err) != nfserr_stale_stateid) && \
454 ((err) != nfserr_bad_stateid))
455
456 struct nfsd4_compound_state;
457
458 extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
459 stateid_t *stateid, int flags, struct file **filp);
460 extern void nfs4_lock_state(void);
461 extern void nfs4_unlock_state(void);
462 extern int nfs4_in_grace(void);
463 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
464 extern void nfs4_free_stateowner(struct kref *kref);
465 extern int set_callback_cred(void);
466 extern void nfsd4_probe_callback(struct nfs4_client *clp);
467 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
468 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
469 extern void nfsd4_do_callback_rpc(struct work_struct *);
470 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
471 extern int nfsd4_create_callback_queue(void);
472 extern void nfsd4_destroy_callback_queue(void);
473 extern void nfsd4_shutdown_callback(struct nfs4_client *);
474 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
475 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
476 extern void nfsd4_init_recdir(char *recdir_name);
477 extern int nfsd4_recdir_load(void);
478 extern void nfsd4_shutdown_recdir(void);
479 extern int nfs4_client_to_reclaim(const char *name);
480 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
481 extern void nfsd4_recdir_purge_old(void);
482 extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
483 extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
484 extern void release_session_client(struct nfsd4_session *);
485
486 static inline void
nfs4_put_stateowner(struct nfs4_stateowner * so)487 nfs4_put_stateowner(struct nfs4_stateowner *so)
488 {
489 kref_put(&so->so_ref, nfs4_free_stateowner);
490 }
491
492 static inline void
nfs4_get_stateowner(struct nfs4_stateowner * so)493 nfs4_get_stateowner(struct nfs4_stateowner *so)
494 {
495 kref_get(&so->so_ref);
496 }
497
498 #endif /* NFSD4_STATE_H */
499