2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <andros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
35 #ifndef _NFSD4_STATE_H
36 #define _NFSD4_STATE_H
38 #include <linux/nfsd/nfsfh.h>
54 stateid_opaque_t si_opaque;
56 #define si_boot si_opaque.so_boot
57 #define si_stateownerid si_opaque.so_stateownerid
58 #define si_fileid si_opaque.so_fileid
60 #define STATEID_FMT "(%08x/%08x/%08x/%08x)"
61 #define STATEID_VAL(s) \
63 (s)->si_stateownerid, \
67 struct nfsd4_callback {
69 struct nfs4_client *cb_clp;
71 struct rpc_message cb_msg;
72 const struct rpc_call_ops *cb_ops;
73 struct work_struct cb_work;
76 struct nfs4_delegation {
77 struct list_head dl_perfile;
78 struct list_head dl_perclnt;
79 struct list_head dl_recall_lru; /* delegation recalled */
80 atomic_t dl_count; /* ref count */
81 struct nfs4_client *dl_client;
82 struct nfs4_file *dl_file;
83 struct file_lock *dl_flock;
88 struct knfsd_fh dl_fh;
90 struct nfsd4_callback dl_recall;
93 /* client delegation callback info */
95 /* SETCLIENTID info */
96 struct sockaddr_storage cb_addr;
100 u32 cb_ident; /* minorversion 0 only */
101 struct svc_xprt *cb_xprt; /* minorversion 1 only */
104 /* Maximum number of slots per session. 160 is useful for long haul TCP */
105 #define NFSD_MAX_SLOTS_PER_SESSION 160
106 /* Maximum number of operations per session compound */
107 #define NFSD_MAX_OPS_PER_COMPOUND 16
108 /* Maximum session per slot cache size */
109 #define NFSD_SLOT_CACHE_SIZE 1024
110 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
111 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
112 #define NFSD_MAX_MEM_PER_SESSION \
113 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
125 struct nfsd4_channel_attrs {
136 struct nfsd4_create_session {
138 struct nfs4_sessionid sessionid;
141 struct nfsd4_channel_attrs fore_channel;
142 struct nfsd4_channel_attrs back_channel;
148 /* The single slot clientid cache structure */
149 struct nfsd4_clid_slot {
152 struct nfsd4_create_session sl_cr_ses;
156 struct list_head cn_persession;
157 struct svc_xprt *cn_xprt;
158 /* CDFC4_FORE, CDFC4_BACK: */
159 unsigned char cn_flags;
162 struct nfsd4_session {
164 struct list_head se_hash; /* hash by sessionid */
165 struct list_head se_perclnt;
167 struct nfs4_client *se_client;
168 struct nfs4_sessionid se_sessionid;
169 struct nfsd4_channel_attrs se_fchannel;
170 struct nfsd4_channel_attrs se_bchannel;
171 struct list_head se_conns;
172 struct nfsd4_slot *se_slots[]; /* forward channel slots */
176 nfsd4_put_session(struct nfsd4_session *ses)
178 extern void free_session(struct kref *kref);
179 kref_put(&ses->se_ref, free_session);
183 nfsd4_get_session(struct nfsd4_session *ses)
185 kref_get(&ses->se_ref);
188 /* formatted contents of nfs4_sessionid */
189 struct nfsd4_sessionid {
195 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
198 * struct nfs4_client - one per client. Clientids live here.
199 * o Each nfs4_client is hashed by clientid.
201 * o Each nfs4_clients is also hashed by name
202 * (the opaque quantity initially sent by the client to identify itself).
204 * o cl_perclient list is used to ensure no dangling stateowner references
205 * when we expire the nfs4_client
208 struct list_head cl_idhash; /* hash by cl_clientid.id */
209 struct list_head cl_strhash; /* hash by cl_name */
210 struct list_head cl_openowners;
211 struct list_head cl_delegations;
212 struct list_head cl_lru; /* tail queue */
213 struct xdr_netobj cl_name; /* id generated by client */
214 char cl_recdir[HEXDIR_LEN]; /* recovery dir */
215 nfs4_verifier cl_verifier; /* generated by client */
216 time_t cl_time; /* time of last lease renewal */
217 struct sockaddr_storage cl_addr; /* client ipaddress */
218 u32 cl_flavor; /* setclientid pseudoflavor */
219 char *cl_principal; /* setclientid principal name */
220 struct svc_cred cl_cred; /* setclientid principal */
221 clientid_t cl_clientid; /* generated by server */
222 nfs4_verifier cl_confirm; /* generated by server */
223 u32 cl_firststate; /* recovery dir creation */
225 /* for v4.0 and v4.1 callbacks: */
226 struct nfs4_cb_conn cl_cb_conn;
227 #define NFSD4_CLIENT_CB_UPDATE 1
228 #define NFSD4_CLIENT_KILL 2
229 unsigned long cl_cb_flags;
230 struct rpc_clnt *cl_cb_client;
233 struct nfsd4_callback cl_cb_null;
235 /* for all client information that callback code might need: */
239 struct list_head cl_sessions;
240 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
241 u32 cl_exchange_flags;
242 struct nfs4_sessionid cl_sessionid;
243 /* number of rpc's in progress over an associated session: */
244 atomic_t cl_refcount;
246 /* for nfs41 callbacks */
247 /* We currently support a single back channel with a single slot */
248 unsigned long cl_cb_slot_busy;
250 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
251 /* wait here for slots */
255 mark_client_expired(struct nfs4_client *clp)
261 is_client_expired(struct nfs4_client *clp)
263 return clp->cl_time == 0;
266 /* struct nfs4_client_reset
267 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
268 * upon lease reset, or from upcall to state_daemon (to read in state
269 * from non-volitile storage) upon reboot.
271 struct nfs4_client_reclaim {
272 struct list_head cr_strhash; /* hash by cr_name */
273 char cr_recdir[HEXDIR_LEN]; /* recover dir */
277 update_stateid(stateid_t *stateid)
279 stateid->si_generation++;
282 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
283 * The OPEN response, typically the largest, requires
284 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
285 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
286 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
289 #define NFSD4_REPLAY_ISIZE 112
292 * Replay buffer, where the result of the last seqid-mutating operation
297 unsigned int rp_buflen;
299 unsigned intrp_allocated;
300 struct knfsd_fh rp_openfh;
301 char rp_ibuf[NFSD4_REPLAY_ISIZE];
305 * nfs4_stateowner can either be an open_owner, or a lock_owner
307 * so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
309 * so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
311 * so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
313 * so_perfilestate: heads the list of nfs4_stateid (either open or lock)
314 * and is used to ensure no dangling nfs4_stateid references when we
315 * release a stateowner.
316 * so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
317 * close is called to reap associated byte-range locks
318 * so_close_lru: (open) stateowner is placed on this list instead of being
319 * reaped (when so_perfilestate is empty) to hold the last close replay.
320 * reaped by laundramat thread after lease period.
322 struct nfs4_stateowner {
324 struct list_head so_idhash; /* hash by so_id */
325 struct list_head so_strhash; /* hash by op_name */
326 struct list_head so_perclient;
327 struct list_head so_stateids;
328 struct list_head so_perstateid; /* for lockowners only */
329 struct list_head so_close_lru; /* tail queue */
330 time_t so_time; /* time of placement on so_close_lru */
331 int so_is_open_owner; /* 1=openowner,0=lockowner */
333 struct nfs4_client * so_client;
334 /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
335 * sequence id expected from the client: */
337 struct xdr_netobj so_owner; /* open owner name */
338 int so_confirmed; /* successful OPEN_CONFIRM? */
339 struct nfs4_replay so_replay;
343 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
344 * o fi_perfile list is used to search for conflicting
345 * share_acces, share_deny on the file.
349 struct list_head fi_hash; /* hash by "struct inode *" */
350 struct list_head fi_stateids;
351 struct list_head fi_delegations;
352 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
353 struct file * fi_fds[3];
354 /* One each for O_RDONLY, O_WRONLY: */
355 atomic_t fi_access[2];
357 * Each open stateid contributes 1 to either fi_readers or
358 * fi_writers, or both, depending on the open mode. A
359 * delegation also takes an fi_readers reference. Lock
360 * stateid's take none.
364 struct inode *fi_inode;
365 u32 fi_id; /* used with stateowner->so_id
366 * for stateid_hashtbl hash */
367 bool fi_had_conflict;
370 /* XXX: for first cut may fall back on returning file that doesn't work
372 static inline struct file *find_writeable_file(struct nfs4_file *f)
374 if (f->fi_fds[O_WRONLY])
375 return f->fi_fds[O_WRONLY];
376 return f->fi_fds[O_RDWR];
379 static inline struct file *find_readable_file(struct nfs4_file *f)
381 if (f->fi_fds[O_RDONLY])
382 return f->fi_fds[O_RDONLY];
383 return f->fi_fds[O_RDWR];
386 static inline struct file *find_any_file(struct nfs4_file *f)
388 if (f->fi_fds[O_RDWR])
389 return f->fi_fds[O_RDWR];
390 else if (f->fi_fds[O_WRONLY])
391 return f->fi_fds[O_WRONLY];
393 return f->fi_fds[O_RDONLY];
397 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
399 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
401 * st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
402 * st_perfile: file_hashtbl[] entry.
403 * st_perfile_state: nfs4_stateowner->so_perfilestate
404 * st_perlockowner: (open stateid) list of lock nfs4_stateowners
405 * st_access_bmap: used only for open stateid
406 * st_deny_bmap: used only for open stateid
407 * st_openstp: open stateid lock stateid was derived from
409 * XXX: open stateids and lock stateids have diverged sufficiently that
410 * we should consider defining separate structs for the two cases.
413 struct nfs4_stateid {
414 struct list_head st_hash;
415 struct list_head st_perfile;
416 struct list_head st_perstateowner;
417 struct list_head st_lockowners;
418 struct nfs4_stateowner * st_stateowner;
419 struct nfs4_file * st_file;
420 stateid_t st_stateid;
421 unsigned long st_access_bmap;
422 unsigned long st_deny_bmap;
423 struct nfs4_stateid * st_openstp;
426 /* flags for preprocess_seqid_op() */
427 #define HAS_SESSION 0x00000001
428 #define CONFIRM 0x00000002
429 #define OPEN_STATE 0x00000004
430 #define LOCK_STATE 0x00000008
431 #define RD_STATE 0x00000010
432 #define WR_STATE 0x00000020
433 #define CLOSE_STATE 0x00000040
435 #define seqid_mutating_err(err) \
436 (((err) != nfserr_stale_clientid) && \
437 ((err) != nfserr_bad_seqid) && \
438 ((err) != nfserr_stale_stateid) && \
439 ((err) != nfserr_bad_stateid))
441 struct nfsd4_compound_state;
443 extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
444 stateid_t *stateid, int flags, struct file **filp);
445 extern void nfs4_lock_state(void);
446 extern void nfs4_unlock_state(void);
447 extern int nfs4_in_grace(void);
448 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
449 extern void nfs4_free_stateowner(struct kref *kref);
450 extern int set_callback_cred(void);
451 extern void nfsd4_probe_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
452 extern void nfsd4_do_callback_rpc(struct work_struct *);
453 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
454 extern int nfsd4_create_callback_queue(void);
455 extern void nfsd4_destroy_callback_queue(void);
456 extern void nfsd4_shutdown_callback(struct nfs4_client *);
457 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
458 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
459 extern void nfsd4_init_recdir(char *recdir_name);
460 extern int nfsd4_recdir_load(void);
461 extern void nfsd4_shutdown_recdir(void);
462 extern int nfs4_client_to_reclaim(const char *name);
463 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
464 extern void nfsd4_recdir_purge_old(void);
465 extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
466 extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
467 extern void release_session_client(struct nfsd4_session *);
470 nfs4_put_stateowner(struct nfs4_stateowner *so)
472 kref_put(&so->so_ref, nfs4_free_stateowner);
476 nfs4_get_stateowner(struct nfs4_stateowner *so)
478 kref_get(&so->so_ref);
481 #endif /* NFSD4_STATE_H */