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;
89 struct knfsd_fh dl_fh;
91 struct nfsd4_callback dl_recall;
94 /* client delegation callback info */
96 /* SETCLIENTID info */
97 struct sockaddr_storage cb_addr;
101 u32 cb_ident; /* minorversion 0 only */
102 struct svc_xprt *cb_xprt; /* minorversion 1 only */
105 /* Maximum number of slots per session. 160 is useful for long haul TCP */
106 #define NFSD_MAX_SLOTS_PER_SESSION 160
107 /* Maximum number of operations per session compound */
108 #define NFSD_MAX_OPS_PER_COMPOUND 16
109 /* Maximum session per slot cache size */
110 #define NFSD_SLOT_CACHE_SIZE 1024
111 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
112 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
113 #define NFSD_MAX_MEM_PER_SESSION \
114 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
126 struct nfsd4_channel_attrs {
137 struct nfsd4_create_session {
139 struct nfs4_sessionid sessionid;
142 struct nfsd4_channel_attrs fore_channel;
143 struct nfsd4_channel_attrs back_channel;
149 /* The single slot clientid cache structure */
150 struct nfsd4_clid_slot {
153 struct nfsd4_create_session sl_cr_ses;
156 struct nfsd4_session {
158 struct list_head se_hash; /* hash by sessionid */
159 struct list_head se_perclnt;
161 struct nfs4_client *se_client;
162 struct nfs4_sessionid se_sessionid;
163 struct nfsd4_channel_attrs se_fchannel;
164 struct nfsd4_channel_attrs se_bchannel;
165 struct nfsd4_slot *se_slots[]; /* forward channel slots */
169 nfsd4_put_session(struct nfsd4_session *ses)
171 extern void free_session(struct kref *kref);
172 kref_put(&ses->se_ref, free_session);
176 nfsd4_get_session(struct nfsd4_session *ses)
178 kref_get(&ses->se_ref);
181 /* formatted contents of nfs4_sessionid */
182 struct nfsd4_sessionid {
188 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
191 * struct nfs4_client - one per client. Clientids live here.
192 * o Each nfs4_client is hashed by clientid.
194 * o Each nfs4_clients is also hashed by name
195 * (the opaque quantity initially sent by the client to identify itself).
197 * o cl_perclient list is used to ensure no dangling stateowner references
198 * when we expire the nfs4_client
201 struct list_head cl_idhash; /* hash by cl_clientid.id */
202 struct list_head cl_strhash; /* hash by cl_name */
203 struct list_head cl_openowners;
204 struct list_head cl_delegations;
205 struct list_head cl_lru; /* tail queue */
206 struct xdr_netobj cl_name; /* id generated by client */
207 char cl_recdir[HEXDIR_LEN]; /* recovery dir */
208 nfs4_verifier cl_verifier; /* generated by client */
209 time_t cl_time; /* time of last lease renewal */
210 struct sockaddr_storage cl_addr; /* client ipaddress */
211 u32 cl_flavor; /* setclientid pseudoflavor */
212 char *cl_principal; /* setclientid principal name */
213 struct svc_cred cl_cred; /* setclientid principal */
214 clientid_t cl_clientid; /* generated by server */
215 nfs4_verifier cl_confirm; /* generated by server */
216 u32 cl_firststate; /* recovery dir creation */
218 /* for v4.0 and v4.1 callbacks: */
219 struct nfs4_cb_conn cl_cb_conn;
220 struct rpc_clnt *cl_cb_client;
222 struct nfsd4_callback cl_cb_null;
225 struct list_head cl_sessions;
226 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
227 u32 cl_exchange_flags;
228 struct nfs4_sessionid cl_sessionid;
229 /* number of rpc's in progress over an associated session: */
230 atomic_t cl_refcount;
232 /* for nfs41 callbacks */
233 /* We currently support a single back channel with a single slot */
234 unsigned long cl_cb_slot_busy;
236 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
237 /* wait here for slots */
241 mark_client_expired(struct nfs4_client *clp)
247 is_client_expired(struct nfs4_client *clp)
249 return clp->cl_time == 0;
252 /* struct nfs4_client_reset
253 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
254 * upon lease reset, or from upcall to state_daemon (to read in state
255 * from non-volitile storage) upon reboot.
257 struct nfs4_client_reclaim {
258 struct list_head cr_strhash; /* hash by cr_name */
259 char cr_recdir[HEXDIR_LEN]; /* recover dir */
263 update_stateid(stateid_t *stateid)
265 stateid->si_generation++;
268 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
269 * The OPEN response, typically the largest, requires
270 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
271 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
272 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
275 #define NFSD4_REPLAY_ISIZE 112
278 * Replay buffer, where the result of the last seqid-mutating operation
283 unsigned int rp_buflen;
285 unsigned intrp_allocated;
286 struct knfsd_fh rp_openfh;
287 char rp_ibuf[NFSD4_REPLAY_ISIZE];
291 * nfs4_stateowner can either be an open_owner, or a lock_owner
293 * so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
295 * so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
297 * so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
299 * so_perfilestate: heads the list of nfs4_stateid (either open or lock)
300 * and is used to ensure no dangling nfs4_stateid references when we
301 * release a stateowner.
302 * so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
303 * close is called to reap associated byte-range locks
304 * so_close_lru: (open) stateowner is placed on this list instead of being
305 * reaped (when so_perfilestate is empty) to hold the last close replay.
306 * reaped by laundramat thread after lease period.
308 struct nfs4_stateowner {
310 struct list_head so_idhash; /* hash by so_id */
311 struct list_head so_strhash; /* hash by op_name */
312 struct list_head so_perclient;
313 struct list_head so_stateids;
314 struct list_head so_perstateid; /* for lockowners only */
315 struct list_head so_close_lru; /* tail queue */
316 time_t so_time; /* time of placement on so_close_lru */
317 int so_is_open_owner; /* 1=openowner,0=lockowner */
319 struct nfs4_client * so_client;
320 /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
321 * sequence id expected from the client: */
323 struct xdr_netobj so_owner; /* open owner name */
324 int so_confirmed; /* successful OPEN_CONFIRM? */
325 struct nfs4_replay so_replay;
329 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
330 * o fi_perfile list is used to search for conflicting
331 * share_acces, share_deny on the file.
335 struct list_head fi_hash; /* hash by "struct inode *" */
336 struct list_head fi_stateids;
337 struct list_head fi_delegations;
338 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
339 struct file * fi_fds[3];
340 /* One each for O_RDONLY, O_WRONLY: */
341 atomic_t fi_access[2];
343 * Each open stateid contributes 1 to either fi_readers or
344 * fi_writers, or both, depending on the open mode. A
345 * delegation also takes an fi_readers reference. Lock
346 * stateid's take none.
350 struct inode *fi_inode;
351 u32 fi_id; /* used with stateowner->so_id
352 * for stateid_hashtbl hash */
353 bool fi_had_conflict;
356 /* XXX: for first cut may fall back on returning file that doesn't work
358 static inline struct file *find_writeable_file(struct nfs4_file *f)
360 if (f->fi_fds[O_WRONLY])
361 return f->fi_fds[O_WRONLY];
362 return f->fi_fds[O_RDWR];
365 static inline struct file *find_readable_file(struct nfs4_file *f)
367 if (f->fi_fds[O_RDONLY])
368 return f->fi_fds[O_RDONLY];
369 return f->fi_fds[O_RDWR];
372 static inline struct file *find_any_file(struct nfs4_file *f)
374 if (f->fi_fds[O_RDWR])
375 return f->fi_fds[O_RDWR];
376 else if (f->fi_fds[O_WRONLY])
377 return f->fi_fds[O_WRONLY];
379 return f->fi_fds[O_RDONLY];
383 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
385 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
387 * st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
388 * st_perfile: file_hashtbl[] entry.
389 * st_perfile_state: nfs4_stateowner->so_perfilestate
390 * st_perlockowner: (open stateid) list of lock nfs4_stateowners
391 * st_access_bmap: used only for open stateid
392 * st_deny_bmap: used only for open stateid
393 * st_openstp: open stateid lock stateid was derived from
395 * XXX: open stateids and lock stateids have diverged sufficiently that
396 * we should consider defining separate structs for the two cases.
399 struct nfs4_stateid {
400 struct list_head st_hash;
401 struct list_head st_perfile;
402 struct list_head st_perstateowner;
403 struct list_head st_lockowners;
404 struct nfs4_stateowner * st_stateowner;
405 struct nfs4_file * st_file;
406 stateid_t st_stateid;
407 unsigned long st_access_bmap;
408 unsigned long st_deny_bmap;
409 struct nfs4_stateid * st_openstp;
412 /* flags for preprocess_seqid_op() */
413 #define HAS_SESSION 0x00000001
414 #define CONFIRM 0x00000002
415 #define OPEN_STATE 0x00000004
416 #define LOCK_STATE 0x00000008
417 #define RD_STATE 0x00000010
418 #define WR_STATE 0x00000020
419 #define CLOSE_STATE 0x00000040
421 #define seqid_mutating_err(err) \
422 (((err) != nfserr_stale_clientid) && \
423 ((err) != nfserr_bad_seqid) && \
424 ((err) != nfserr_stale_stateid) && \
425 ((err) != nfserr_bad_stateid))
427 struct nfsd4_compound_state;
429 extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
430 stateid_t *stateid, int flags, struct file **filp);
431 extern void nfs4_lock_state(void);
432 extern void nfs4_unlock_state(void);
433 extern int nfs4_in_grace(void);
434 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
435 extern void nfs4_free_stateowner(struct kref *kref);
436 extern int set_callback_cred(void);
437 extern void nfsd4_probe_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
438 extern void nfsd4_do_callback_rpc(struct work_struct *);
439 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
440 extern int nfsd4_create_callback_queue(void);
441 extern void nfsd4_destroy_callback_queue(void);
442 extern void nfsd4_set_callback_client(struct nfs4_client *, struct rpc_clnt *);
443 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
444 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
445 extern void nfsd4_init_recdir(char *recdir_name);
446 extern int nfsd4_recdir_load(void);
447 extern void nfsd4_shutdown_recdir(void);
448 extern int nfs4_client_to_reclaim(const char *name);
449 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
450 extern void nfsd4_recdir_purge_old(void);
451 extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
452 extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
453 extern void release_session_client(struct nfsd4_session *);
456 nfs4_put_stateowner(struct nfs4_stateowner *so)
458 kref_put(&so->so_ref, nfs4_free_stateowner);
462 nfs4_get_stateowner(struct nfs4_stateowner *so)
464 kref_get(&so->so_ref);
467 #endif /* NFSD4_STATE_H */