2 * linux/include/nfsd/state.h
4 * Copyright (c) 2001 The Regents of the University of Michigan.
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #ifndef _NFSD4_STATE_H
38 #define _NFSD4_STATE_H
40 #include <linux/nfsd/nfsfh.h>
56 stateid_opaque_t si_opaque;
58 #define si_boot si_opaque.so_boot
59 #define si_stateownerid si_opaque.so_stateownerid
60 #define si_fileid si_opaque.so_fileid
62 #define STATEID_FMT "(%08x/%08x/%08x/%08x)"
63 #define STATEID_VAL(s) \
65 (s)->si_stateownerid, \
69 struct nfsd4_cb_sequence {
72 struct nfs4_client *cbs_clp;
75 struct nfs4_delegation {
76 struct list_head dl_perfile;
77 struct list_head dl_perclnt;
78 struct list_head dl_recall_lru; /* delegation recalled */
79 atomic_t dl_count; /* ref count */
80 struct nfs4_client *dl_client;
81 struct nfs4_file *dl_file;
82 struct file_lock *dl_flock;
83 struct file *dl_vfs_file;
89 struct knfsd_fh dl_fh;
93 /* client delegation callback info */
95 /* SETCLIENTID info */
96 struct sockaddr_storage cb_addr;
100 u32 cb_ident; /* minorversion 0 only */
101 /* RPC client info */
102 atomic_t cb_set; /* successful CB_NULL call */
103 struct rpc_clnt * cb_client;
106 /* Maximum number of slots per session. 160 is useful for long haul TCP */
107 #define NFSD_MAX_SLOTS_PER_SESSION 160
108 /* Maximum number of operations per session compound */
109 #define NFSD_MAX_OPS_PER_COMPOUND 16
110 /* Maximum session per slot cache size */
111 #define NFSD_SLOT_CACHE_SIZE 1024
112 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
113 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
114 #define NFSD_MAX_MEM_PER_SESSION \
115 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
127 struct nfsd4_channel_attrs {
138 struct nfsd4_create_session {
140 struct nfs4_sessionid sessionid;
143 struct nfsd4_channel_attrs fore_channel;
144 struct nfsd4_channel_attrs back_channel;
150 /* The single slot clientid cache structure */
151 struct nfsd4_clid_slot {
154 struct nfsd4_create_session sl_cr_ses;
157 struct nfsd4_session {
159 struct list_head se_hash; /* hash by sessionid */
160 struct list_head se_perclnt;
162 struct nfs4_client *se_client; /* for expire_client */
163 struct nfs4_sessionid se_sessionid;
164 struct nfsd4_channel_attrs se_fchannel;
165 struct nfsd4_channel_attrs se_bchannel;
166 struct nfsd4_slot *se_slots[]; /* forward channel slots */
170 nfsd4_put_session(struct nfsd4_session *ses)
172 extern void free_session(struct kref *kref);
173 kref_put(&ses->se_ref, free_session);
177 nfsd4_get_session(struct nfsd4_session *ses)
179 kref_get(&ses->se_ref);
182 /* formatted contents of nfs4_sessionid */
183 struct nfsd4_sessionid {
189 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
192 * struct nfs4_client - one per client. Clientids live here.
193 * o Each nfs4_client is hashed by clientid.
195 * o Each nfs4_clients is also hashed by name
196 * (the opaque quantity initially sent by the client to identify itself).
198 * o cl_perclient list is used to ensure no dangling stateowner references
199 * when we expire the nfs4_client
202 struct list_head cl_idhash; /* hash by cl_clientid.id */
203 struct list_head cl_strhash; /* hash by cl_name */
204 struct list_head cl_openowners;
205 struct list_head cl_delegations;
206 struct list_head cl_lru; /* tail queue */
207 struct xdr_netobj cl_name; /* id generated by client */
208 char cl_recdir[HEXDIR_LEN]; /* recovery dir */
209 nfs4_verifier cl_verifier; /* generated by client */
210 time_t cl_time; /* time of last lease renewal */
211 struct sockaddr_storage cl_addr; /* client ipaddress */
212 u32 cl_flavor; /* setclientid pseudoflavor */
213 char *cl_principal; /* setclientid principal name */
214 struct svc_cred cl_cred; /* setclientid principal */
215 clientid_t cl_clientid; /* generated by server */
216 nfs4_verifier cl_confirm; /* generated by server */
217 struct nfs4_cb_conn cl_cb_conn; /* callback info */
218 atomic_t cl_count; /* ref count */
219 u32 cl_firststate; /* recovery dir creation */
222 struct list_head cl_sessions;
223 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
224 u32 cl_exchange_flags;
225 struct nfs4_sessionid cl_sessionid;
227 /* for nfs41 callbacks */
228 /* We currently support a single back channel with a single slot */
229 unsigned long cl_cb_slot_busy;
231 struct svc_xprt *cl_cb_xprt; /* 4.1 callback transport */
232 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
233 /* wait here for slots */
236 /* struct nfs4_client_reset
237 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
238 * upon lease reset, or from upcall to state_daemon (to read in state
239 * from non-volitile storage) upon reboot.
241 struct nfs4_client_reclaim {
242 struct list_head cr_strhash; /* hash by cr_name */
243 char cr_recdir[HEXDIR_LEN]; /* recover dir */
247 update_stateid(stateid_t *stateid)
249 stateid->si_generation++;
252 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
253 * The OPEN response, typically the largest, requires
254 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
255 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
256 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
259 #define NFSD4_REPLAY_ISIZE 112
262 * Replay buffer, where the result of the last seqid-mutating operation
267 unsigned int rp_buflen;
269 unsigned intrp_allocated;
270 struct knfsd_fh rp_openfh;
271 char rp_ibuf[NFSD4_REPLAY_ISIZE];
275 * nfs4_stateowner can either be an open_owner, or a lock_owner
277 * so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
279 * so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
281 * so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
283 * so_perfilestate: heads the list of nfs4_stateid (either open or lock)
284 * and is used to ensure no dangling nfs4_stateid references when we
285 * release a stateowner.
286 * so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
287 * close is called to reap associated byte-range locks
288 * so_close_lru: (open) stateowner is placed on this list instead of being
289 * reaped (when so_perfilestate is empty) to hold the last close replay.
290 * reaped by laundramat thread after lease period.
292 struct nfs4_stateowner {
294 struct list_head so_idhash; /* hash by so_id */
295 struct list_head so_strhash; /* hash by op_name */
296 struct list_head so_perclient;
297 struct list_head so_stateids;
298 struct list_head so_perstateid; /* for lockowners only */
299 struct list_head so_close_lru; /* tail queue */
300 time_t so_time; /* time of placement on so_close_lru */
301 int so_is_open_owner; /* 1=openowner,0=lockowner */
303 struct nfs4_client * so_client;
304 /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
305 * sequence id expected from the client: */
307 struct xdr_netobj so_owner; /* open owner name */
308 int so_confirmed; /* successful OPEN_CONFIRM? */
309 struct nfs4_replay so_replay;
313 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
314 * o fi_perfile list is used to search for conflicting
315 * share_acces, share_deny on the file.
319 struct list_head fi_hash; /* hash by "struct inode *" */
320 struct list_head fi_stateids;
321 struct list_head fi_delegations;
322 struct inode *fi_inode;
323 u32 fi_id; /* used with stateowner->so_id
324 * for stateid_hashtbl hash */
325 bool fi_had_conflict;
329 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
331 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
333 * st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
334 * st_perfile: file_hashtbl[] entry.
335 * st_perfile_state: nfs4_stateowner->so_perfilestate
336 * st_perlockowner: (open stateid) list of lock nfs4_stateowners
337 * st_access_bmap: used only for open stateid
338 * st_deny_bmap: used only for open stateid
339 * st_openstp: open stateid lock stateid was derived from
341 * XXX: open stateids and lock stateids have diverged sufficiently that
342 * we should consider defining separate structs for the two cases.
345 struct nfs4_stateid {
346 struct list_head st_hash;
347 struct list_head st_perfile;
348 struct list_head st_perstateowner;
349 struct list_head st_lockowners;
350 struct nfs4_stateowner * st_stateowner;
351 struct nfs4_file * st_file;
352 stateid_t st_stateid;
353 struct file * st_vfs_file;
354 unsigned long st_access_bmap;
355 unsigned long st_deny_bmap;
356 struct nfs4_stateid * st_openstp;
359 /* flags for preprocess_seqid_op() */
360 #define HAS_SESSION 0x00000001
361 #define CONFIRM 0x00000002
362 #define OPEN_STATE 0x00000004
363 #define LOCK_STATE 0x00000008
364 #define RD_STATE 0x00000010
365 #define WR_STATE 0x00000020
366 #define CLOSE_STATE 0x00000040
368 #define seqid_mutating_err(err) \
369 (((err) != nfserr_stale_clientid) && \
370 ((err) != nfserr_bad_seqid) && \
371 ((err) != nfserr_stale_stateid) && \
372 ((err) != nfserr_bad_stateid))
374 struct nfsd4_compound_state;
376 extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
377 stateid_t *stateid, int flags, struct file **filp);
378 extern void nfs4_lock_state(void);
379 extern void nfs4_unlock_state(void);
380 extern int nfs4_in_grace(void);
381 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
382 extern void put_nfs4_client(struct nfs4_client *clp);
383 extern void nfs4_free_stateowner(struct kref *kref);
384 extern int set_callback_cred(void);
385 extern void nfsd4_probe_callback(struct nfs4_client *clp);
386 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
387 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
388 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
389 extern void nfsd4_init_recdir(char *recdir_name);
390 extern int nfsd4_recdir_load(void);
391 extern void nfsd4_shutdown_recdir(void);
392 extern int nfs4_client_to_reclaim(const char *name);
393 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
394 extern void nfsd4_recdir_purge_old(void);
395 extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
396 extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
399 nfs4_put_stateowner(struct nfs4_stateowner *so)
401 kref_put(&so->so_ref, nfs4_free_stateowner);
405 nfs4_get_stateowner(struct nfs4_stateowner *so)
407 kref_get(&so->so_ref);
410 #endif /* NFSD4_STATE_H */