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/idr.h>
39 #include <linux/refcount.h>
40 #include <linux/sunrpc/svc_xprt.h>
41 #include "nfsfh.h"
42 #include "nfsd.h"
43
44 typedef struct {
45 u32 cl_boot;
46 u32 cl_id;
47 } clientid_t;
48
49 typedef struct {
50 clientid_t so_clid;
51 u32 so_id;
52 } stateid_opaque_t;
53
54 typedef struct {
55 u32 si_generation;
56 stateid_opaque_t si_opaque;
57 } stateid_t;
58
59 #define STATEID_FMT "(%08x/%08x/%08x/%08x)"
60 #define STATEID_VAL(s) \
61 (s)->si_opaque.so_clid.cl_boot, \
62 (s)->si_opaque.so_clid.cl_id, \
63 (s)->si_opaque.so_id, \
64 (s)->si_generation
65
66 struct nfsd4_callback {
67 struct nfs4_client *cb_clp;
68 struct rpc_message cb_msg;
69 const struct nfsd4_callback_ops *cb_ops;
70 struct work_struct cb_work;
71 int cb_seq_status;
72 int cb_status;
73 bool cb_need_restart;
74 bool cb_holds_slot;
75 };
76
77 struct nfsd4_callback_ops {
78 void (*prepare)(struct nfsd4_callback *);
79 int (*done)(struct nfsd4_callback *, struct rpc_task *);
80 void (*release)(struct nfsd4_callback *);
81 };
82
83 /*
84 * A core object that represents a "common" stateid. These are generally
85 * embedded within the different (more specific) stateid objects and contain
86 * fields that are of general use to any stateid.
87 */
88 struct nfs4_stid {
89 refcount_t sc_count;
90 #define NFS4_OPEN_STID 1
91 #define NFS4_LOCK_STID 2
92 #define NFS4_DELEG_STID 4
93 /* For an open stateid kept around *only* to process close replays: */
94 #define NFS4_CLOSED_STID 8
95 /* For a deleg stateid kept around only to process free_stateid's: */
96 #define NFS4_REVOKED_DELEG_STID 16
97 #define NFS4_CLOSED_DELEG_STID 32
98 #define NFS4_LAYOUT_STID 64
99 unsigned char sc_type;
100 stateid_t sc_stateid;
101 spinlock_t sc_lock;
102 struct nfs4_client *sc_client;
103 struct nfs4_file *sc_file;
104 void (*sc_free)(struct nfs4_stid *);
105 };
106
107 /*
108 * Represents a delegation stateid. The nfs4_client holds references to these
109 * and they are put when it is being destroyed or when the delegation is
110 * returned by the client:
111 *
112 * o 1 reference as long as a delegation is still in force (taken when it's
113 * alloc'd, put when it's returned or revoked)
114 *
115 * o 1 reference as long as a recall rpc is in progress (taken when the lease
116 * is broken, put when the rpc exits)
117 *
118 * o 1 more ephemeral reference for each nfsd thread currently doing something
119 * with that delegation without holding the cl_lock
120 *
121 * If the server attempts to recall a delegation and the client doesn't do so
122 * before a timeout, the server may also revoke the delegation. In that case,
123 * the object will either be destroyed (v4.0) or moved to a per-client list of
124 * revoked delegations (v4.1+).
125 *
126 * This object is a superset of the nfs4_stid.
127 */
128 struct nfs4_delegation {
129 struct nfs4_stid dl_stid; /* must be first field */
130 struct list_head dl_perfile;
131 struct list_head dl_perclnt;
132 struct list_head dl_recall_lru; /* delegation recalled */
133 struct nfs4_clnt_odstate *dl_clnt_odstate;
134 u32 dl_type;
135 time_t dl_time;
136 /* For recall: */
137 int dl_retries;
138 struct nfsd4_callback dl_recall;
139 };
140
141 #define cb_to_delegation(cb) \
142 container_of(cb, struct nfs4_delegation, dl_recall)
143
144 /* client delegation callback info */
145 struct nfs4_cb_conn {
146 /* SETCLIENTID info */
147 struct sockaddr_storage cb_addr;
148 struct sockaddr_storage cb_saddr;
149 size_t cb_addrlen;
150 u32 cb_prog; /* used only in 4.0 case;
151 per-session otherwise */
152 u32 cb_ident; /* minorversion 0 only */
153 struct svc_xprt *cb_xprt; /* minorversion 1 only */
154 };
155
delegstateid(struct nfs4_stid * s)156 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
157 {
158 return container_of(s, struct nfs4_delegation, dl_stid);
159 }
160
161 /* Maximum number of slots per session. 160 is useful for long haul TCP */
162 #define NFSD_MAX_SLOTS_PER_SESSION 160
163 /* Maximum number of operations per session compound */
164 #define NFSD_MAX_OPS_PER_COMPOUND 16
165 /* Maximum session per slot cache size */
166 #define NFSD_SLOT_CACHE_SIZE 2048
167 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
168 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
169 #define NFSD_MAX_MEM_PER_SESSION \
170 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
171
172 struct nfsd4_slot {
173 u32 sl_seqid;
174 __be32 sl_status;
175 struct svc_cred sl_cred;
176 u32 sl_datalen;
177 u16 sl_opcnt;
178 #define NFSD4_SLOT_INUSE (1 << 0)
179 #define NFSD4_SLOT_CACHETHIS (1 << 1)
180 #define NFSD4_SLOT_INITIALIZED (1 << 2)
181 #define NFSD4_SLOT_CACHED (1 << 3)
182 u8 sl_flags;
183 char sl_data[];
184 };
185
186 struct nfsd4_channel_attrs {
187 u32 headerpadsz;
188 u32 maxreq_sz;
189 u32 maxresp_sz;
190 u32 maxresp_cached;
191 u32 maxops;
192 u32 maxreqs;
193 u32 nr_rdma_attrs;
194 u32 rdma_attrs;
195 };
196
197 struct nfsd4_cb_sec {
198 u32 flavor; /* (u32)(-1) used to mean "no valid flavor" */
199 kuid_t uid;
200 kgid_t gid;
201 };
202
203 struct nfsd4_create_session {
204 clientid_t clientid;
205 struct nfs4_sessionid sessionid;
206 u32 seqid;
207 u32 flags;
208 struct nfsd4_channel_attrs fore_channel;
209 struct nfsd4_channel_attrs back_channel;
210 u32 callback_prog;
211 struct nfsd4_cb_sec cb_sec;
212 };
213
214 struct nfsd4_backchannel_ctl {
215 u32 bc_cb_program;
216 struct nfsd4_cb_sec bc_cb_sec;
217 };
218
219 struct nfsd4_bind_conn_to_session {
220 struct nfs4_sessionid sessionid;
221 u32 dir;
222 };
223
224 /* The single slot clientid cache structure */
225 struct nfsd4_clid_slot {
226 u32 sl_seqid;
227 __be32 sl_status;
228 struct nfsd4_create_session sl_cr_ses;
229 };
230
231 struct nfsd4_conn {
232 struct list_head cn_persession;
233 struct svc_xprt *cn_xprt;
234 struct svc_xpt_user cn_xpt_user;
235 struct nfsd4_session *cn_session;
236 /* CDFC4_FORE, CDFC4_BACK: */
237 unsigned char cn_flags;
238 };
239
240 /*
241 * Representation of a v4.1+ session. These are refcounted in a similar fashion
242 * to the nfs4_client. References are only taken when the server is actively
243 * working on the object (primarily during the processing of compounds).
244 */
245 struct nfsd4_session {
246 atomic_t se_ref;
247 struct list_head se_hash; /* hash by sessionid */
248 struct list_head se_perclnt;
249 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
250 #define NFS4_SESSION_DEAD 0x010
251 u32 se_flags;
252 struct nfs4_client *se_client;
253 struct nfs4_sessionid se_sessionid;
254 struct nfsd4_channel_attrs se_fchannel;
255 struct nfsd4_channel_attrs se_bchannel;
256 struct nfsd4_cb_sec se_cb_sec;
257 struct list_head se_conns;
258 u32 se_cb_prog;
259 u32 se_cb_seq_nr;
260 struct nfsd4_slot *se_slots[]; /* forward channel slots */
261 };
262
263 /* formatted contents of nfs4_sessionid */
264 struct nfsd4_sessionid {
265 clientid_t clientid;
266 u32 sequence;
267 u32 reserved;
268 };
269
270 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
271
272 /*
273 * struct nfs4_client - one per client. Clientids live here.
274 *
275 * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
276 * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
277 * Each nfsd_net_ns object contains a set of these and they are tracked via
278 * short and long form clientid. They are hashed and searched for under the
279 * per-nfsd_net client_lock spinlock.
280 *
281 * References to it are only held during the processing of compounds, and in
282 * certain other operations. In their "resting state" they have a refcount of
283 * 0. If they are not renewed within a lease period, they become eligible for
284 * destruction by the laundromat.
285 *
286 * These objects can also be destroyed prematurely by the fault injection code,
287 * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
288 * Care is taken *not* to do this however when the objects have an elevated
289 * refcount.
290 *
291 * o Each nfs4_client is hashed by clientid
292 *
293 * o Each nfs4_clients is also hashed by name (the opaque quantity initially
294 * sent by the client to identify itself).
295 *
296 * o cl_perclient list is used to ensure no dangling stateowner references
297 * when we expire the nfs4_client
298 */
299 struct nfs4_client {
300 struct list_head cl_idhash; /* hash by cl_clientid.id */
301 struct rb_node cl_namenode; /* link into by-name trees */
302 struct list_head *cl_ownerstr_hashtbl;
303 struct list_head cl_openowners;
304 struct idr cl_stateids; /* stateid lookup */
305 struct list_head cl_delegations;
306 struct list_head cl_revoked; /* unacknowledged, revoked 4.1 state */
307 struct list_head cl_lru; /* tail queue */
308 #ifdef CONFIG_NFSD_PNFS
309 struct list_head cl_lo_states; /* outstanding layout states */
310 #endif
311 struct xdr_netobj cl_name; /* id generated by client */
312 nfs4_verifier cl_verifier; /* generated by client */
313 time_t cl_time; /* time of last lease renewal */
314 struct sockaddr_storage cl_addr; /* client ipaddress */
315 bool cl_mach_cred; /* SP4_MACH_CRED in force */
316 struct svc_cred cl_cred; /* setclientid principal */
317 clientid_t cl_clientid; /* generated by server */
318 nfs4_verifier cl_confirm; /* generated by server */
319 u32 cl_minorversion;
320 /* NFSv4.1 client implementation id: */
321 struct xdr_netobj cl_nii_domain;
322 struct xdr_netobj cl_nii_name;
323 struct timespec cl_nii_time;
324
325 /* for v4.0 and v4.1 callbacks: */
326 struct nfs4_cb_conn cl_cb_conn;
327 #define NFSD4_CLIENT_CB_UPDATE (0)
328 #define NFSD4_CLIENT_CB_KILL (1)
329 #define NFSD4_CLIENT_STABLE (2) /* client on stable storage */
330 #define NFSD4_CLIENT_RECLAIM_COMPLETE (3) /* reclaim_complete done */
331 #define NFSD4_CLIENT_CONFIRMED (4) /* client is confirmed */
332 #define NFSD4_CLIENT_UPCALL_LOCK (5) /* upcall serialization */
333 #define NFSD4_CLIENT_CB_FLAG_MASK (1 << NFSD4_CLIENT_CB_UPDATE | \
334 1 << NFSD4_CLIENT_CB_KILL)
335 unsigned long cl_flags;
336 const struct cred *cl_cb_cred;
337 struct rpc_clnt *cl_cb_client;
338 u32 cl_cb_ident;
339 #define NFSD4_CB_UP 0
340 #define NFSD4_CB_UNKNOWN 1
341 #define NFSD4_CB_DOWN 2
342 #define NFSD4_CB_FAULT 3
343 int cl_cb_state;
344 struct nfsd4_callback cl_cb_null;
345 struct nfsd4_session *cl_cb_session;
346
347 /* for all client information that callback code might need: */
348 spinlock_t cl_lock;
349
350 /* for nfs41 */
351 struct list_head cl_sessions;
352 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
353 u32 cl_exchange_flags;
354 /* number of rpc's in progress over an associated session: */
355 atomic_t cl_rpc_users;
356 struct nfsdfs_client cl_nfsdfs;
357 struct nfs4_op_map cl_spo_must_allow;
358
359 /* debugging info directory under nfsd/clients/ : */
360 struct dentry *cl_nfsd_dentry;
361
362 /* for nfs41 callbacks */
363 /* We currently support a single back channel with a single slot */
364 unsigned long cl_cb_slot_busy;
365 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
366 /* wait here for slots */
367 struct net *net;
368 struct list_head async_copies; /* list of async copies */
369 spinlock_t async_lock; /* lock for async copies */
370 };
371
372 /* struct nfs4_client_reset
373 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
374 * upon lease reset, or from upcall to state_daemon (to read in state
375 * from non-volitile storage) upon reboot.
376 */
377 struct nfs4_client_reclaim {
378 struct list_head cr_strhash; /* hash by cr_name */
379 struct nfs4_client *cr_clp; /* pointer to associated clp */
380 struct xdr_netobj cr_name; /* recovery dir name */
381 struct xdr_netobj cr_princhash;
382 };
383
384 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
385 * The OPEN response, typically the largest, requires
386 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
387 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
388 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
389 */
390
391 #define NFSD4_REPLAY_ISIZE 112
392
393 /*
394 * Replay buffer, where the result of the last seqid-mutating operation
395 * is cached.
396 */
397 struct nfs4_replay {
398 __be32 rp_status;
399 unsigned int rp_buflen;
400 char *rp_buf;
401 struct knfsd_fh rp_openfh;
402 struct mutex rp_mutex;
403 char rp_ibuf[NFSD4_REPLAY_ISIZE];
404 };
405
406 struct nfs4_stateowner;
407
408 struct nfs4_stateowner_operations {
409 void (*so_unhash)(struct nfs4_stateowner *);
410 void (*so_free)(struct nfs4_stateowner *);
411 };
412
413 /*
414 * A core object that represents either an open or lock owner. The object and
415 * lock owner objects have one of these embedded within them. Refcounts and
416 * other fields common to both owner types are contained within these
417 * structures.
418 */
419 struct nfs4_stateowner {
420 struct list_head so_strhash;
421 struct list_head so_stateids;
422 struct nfs4_client *so_client;
423 const struct nfs4_stateowner_operations *so_ops;
424 /* after increment in nfsd4_bump_seqid, represents the next
425 * sequence id expected from the client: */
426 atomic_t so_count;
427 u32 so_seqid;
428 struct xdr_netobj so_owner; /* open owner name */
429 struct nfs4_replay so_replay;
430 bool so_is_open_owner;
431 };
432
433 /*
434 * When a file is opened, the client provides an open state owner opaque string
435 * that indicates the "owner" of that open. These objects are refcounted.
436 * References to it are held by each open state associated with it. This object
437 * is a superset of the nfs4_stateowner struct.
438 */
439 struct nfs4_openowner {
440 struct nfs4_stateowner oo_owner; /* must be first field */
441 struct list_head oo_perclient;
442 /*
443 * We keep around openowners a little while after last close,
444 * which saves clients from having to confirm, and allows us to
445 * handle close replays if they come soon enough. The close_lru
446 * is a list of such openowners, to be reaped by the laundromat
447 * thread eventually if they remain unused:
448 */
449 struct list_head oo_close_lru;
450 struct nfs4_ol_stateid *oo_last_closed_stid;
451 time_t oo_time; /* time of placement on so_close_lru */
452 #define NFS4_OO_CONFIRMED 1
453 unsigned char oo_flags;
454 };
455
456 /*
457 * Represents a generic "lockowner". Similar to an openowner. References to it
458 * are held by the lock stateids that are created on its behalf. This object is
459 * a superset of the nfs4_stateowner struct.
460 */
461 struct nfs4_lockowner {
462 struct nfs4_stateowner lo_owner; /* must be first element */
463 struct list_head lo_blocked; /* blocked file_locks */
464 };
465
openowner(struct nfs4_stateowner * so)466 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
467 {
468 return container_of(so, struct nfs4_openowner, oo_owner);
469 }
470
lockowner(struct nfs4_stateowner * so)471 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
472 {
473 return container_of(so, struct nfs4_lockowner, lo_owner);
474 }
475
476 /*
477 * Per-client state indicating no. of opens and outstanding delegations
478 * on a file from a particular client.'od' stands for 'open & delegation'
479 */
480 struct nfs4_clnt_odstate {
481 struct nfs4_client *co_client;
482 struct nfs4_file *co_file;
483 struct list_head co_perfile;
484 refcount_t co_odcount;
485 };
486
487 /*
488 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
489 *
490 * These objects are global. nfsd keeps one instance of a nfs4_file per
491 * filehandle (though it may keep multiple file descriptors for each). Each
492 * inode can have multiple filehandles associated with it, so there is
493 * (potentially) a many to one relationship between this struct and struct
494 * inode.
495 *
496 * These are hashed by filehandle in the file_hashtbl, which is protected by
497 * the global state_lock spinlock.
498 */
499 struct nfs4_file {
500 refcount_t fi_ref;
501 spinlock_t fi_lock;
502 struct hlist_node fi_hash; /* hash on fi_fhandle */
503 struct list_head fi_stateids;
504 union {
505 struct list_head fi_delegations;
506 struct rcu_head fi_rcu;
507 };
508 struct list_head fi_clnt_odstate;
509 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
510 struct nfsd_file *fi_fds[3];
511 /*
512 * Each open or lock stateid contributes 0-4 to the counts
513 * below depending on which bits are set in st_access_bitmap:
514 * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
515 * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
516 * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
517 */
518 atomic_t fi_access[2];
519 u32 fi_share_deny;
520 struct nfsd_file *fi_deleg_file;
521 int fi_delegees;
522 struct knfsd_fh fi_fhandle;
523 bool fi_had_conflict;
524 #ifdef CONFIG_NFSD_PNFS
525 struct list_head fi_lo_states;
526 atomic_t fi_lo_recalls;
527 #endif
528 };
529
530 /*
531 * A generic struct representing either a open or lock stateid. The nfs4_client
532 * holds a reference to each of these objects, and they in turn hold a
533 * reference to their respective stateowners. The client's reference is
534 * released in response to a close or unlock (depending on whether it's an open
535 * or lock stateid) or when the client is being destroyed.
536 *
537 * In the case of v4.0 open stateids, these objects are preserved for a little
538 * while after close in order to handle CLOSE replays. Those are eventually
539 * reclaimed via a LRU scheme by the laundromat.
540 *
541 * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
542 * Better suggestions welcome.
543 */
544 struct nfs4_ol_stateid {
545 struct nfs4_stid st_stid;
546 struct list_head st_perfile;
547 struct list_head st_perstateowner;
548 struct list_head st_locks;
549 struct nfs4_stateowner *st_stateowner;
550 struct nfs4_clnt_odstate *st_clnt_odstate;
551 unsigned char st_access_bmap;
552 unsigned char st_deny_bmap;
553 struct nfs4_ol_stateid *st_openstp;
554 struct mutex st_mutex;
555 };
556
openlockstateid(struct nfs4_stid * s)557 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
558 {
559 return container_of(s, struct nfs4_ol_stateid, st_stid);
560 }
561
562 struct nfs4_layout_stateid {
563 struct nfs4_stid ls_stid;
564 struct list_head ls_perclnt;
565 struct list_head ls_perfile;
566 spinlock_t ls_lock;
567 struct list_head ls_layouts;
568 u32 ls_layout_type;
569 struct nfsd_file *ls_file;
570 struct nfsd4_callback ls_recall;
571 stateid_t ls_recall_sid;
572 bool ls_recalled;
573 struct mutex ls_mutex;
574 };
575
layoutstateid(struct nfs4_stid * s)576 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
577 {
578 return container_of(s, struct nfs4_layout_stateid, ls_stid);
579 }
580
581 /* flags for preprocess_seqid_op() */
582 #define RD_STATE 0x00000010
583 #define WR_STATE 0x00000020
584
585 enum nfsd4_cb_op {
586 NFSPROC4_CLNT_CB_NULL = 0,
587 NFSPROC4_CLNT_CB_RECALL,
588 NFSPROC4_CLNT_CB_LAYOUT,
589 NFSPROC4_CLNT_CB_OFFLOAD,
590 NFSPROC4_CLNT_CB_SEQUENCE,
591 NFSPROC4_CLNT_CB_NOTIFY_LOCK,
592 };
593
594 /* Returns true iff a is later than b: */
nfsd4_stateid_generation_after(stateid_t * a,stateid_t * b)595 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
596 {
597 return (s32)(a->si_generation - b->si_generation) > 0;
598 }
599
600 /*
601 * When a client tries to get a lock on a file, we set one of these objects
602 * on the blocking lock. When the lock becomes free, we can then issue a
603 * CB_NOTIFY_LOCK to the server.
604 */
605 struct nfsd4_blocked_lock {
606 struct list_head nbl_list;
607 struct list_head nbl_lru;
608 unsigned long nbl_time;
609 struct file_lock nbl_lock;
610 struct knfsd_fh nbl_fh;
611 struct nfsd4_callback nbl_cb;
612 };
613
614 struct nfsd4_compound_state;
615 struct nfsd_net;
616 struct nfsd4_copy;
617
618 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
619 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
620 stateid_t *stateid, int flags, struct nfsd_file **filp);
621 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
622 stateid_t *stateid, unsigned char typemask,
623 struct nfs4_stid **s, struct nfsd_net *nn);
624 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
625 void (*sc_free)(struct nfs4_stid *));
626 int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy);
627 void nfs4_free_cp_state(struct nfsd4_copy *copy);
628 void nfs4_unhash_stid(struct nfs4_stid *s);
629 void nfs4_put_stid(struct nfs4_stid *s);
630 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
631 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
632 extern void nfs4_release_reclaim(struct nfsd_net *);
633 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name,
634 struct nfsd_net *nn);
635 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
636 struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
637 extern void nfsd4_probe_callback(struct nfs4_client *clp);
638 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
639 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
640 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
641 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
642 extern void nfsd4_run_cb(struct nfsd4_callback *cb);
643 extern int nfsd4_create_callback_queue(void);
644 extern void nfsd4_destroy_callback_queue(void);
645 extern void nfsd4_shutdown_callback(struct nfs4_client *);
646 extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
647 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
648 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name,
649 struct xdr_netobj princhash, struct nfsd_net *nn);
650 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn);
651
652 struct nfs4_file *find_file(struct knfsd_fh *fh);
653 void put_nfs4_file(struct nfs4_file *fi);
654 extern void nfs4_put_copy(struct nfsd4_copy *copy);
655 extern struct nfsd4_copy *
656 find_async_copy(struct nfs4_client *clp, stateid_t *staetid);
get_nfs4_file(struct nfs4_file * fi)657 static inline void get_nfs4_file(struct nfs4_file *fi)
658 {
659 refcount_inc(&fi->fi_ref);
660 }
661 struct nfsd_file *find_any_file(struct nfs4_file *f);
662
663 /* grace period management */
664 void nfsd4_end_grace(struct nfsd_net *nn);
665
666 /* nfs4recover operations */
667 extern int nfsd4_client_tracking_init(struct net *net);
668 extern void nfsd4_client_tracking_exit(struct net *net);
669 extern void nfsd4_client_record_create(struct nfs4_client *clp);
670 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
671 extern int nfsd4_client_record_check(struct nfs4_client *clp);
672 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
673
674 /* nfs fault injection functions */
675 #ifdef CONFIG_NFSD_FAULT_INJECTION
676 void nfsd_fault_inject_init(void);
677 void nfsd_fault_inject_cleanup(void);
678
679 u64 nfsd_inject_print_clients(void);
680 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t);
681 u64 nfsd_inject_forget_clients(u64);
682
683 u64 nfsd_inject_print_locks(void);
684 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t);
685 u64 nfsd_inject_forget_locks(u64);
686
687 u64 nfsd_inject_print_openowners(void);
688 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t);
689 u64 nfsd_inject_forget_openowners(u64);
690
691 u64 nfsd_inject_print_delegations(void);
692 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t);
693 u64 nfsd_inject_forget_delegations(u64);
694 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t);
695 u64 nfsd_inject_recall_delegations(u64);
696 #else /* CONFIG_NFSD_FAULT_INJECTION */
nfsd_fault_inject_init(void)697 static inline void nfsd_fault_inject_init(void) {}
nfsd_fault_inject_cleanup(void)698 static inline void nfsd_fault_inject_cleanup(void) {}
699 #endif /* CONFIG_NFSD_FAULT_INJECTION */
700
701 #endif /* NFSD4_STATE_H */
702