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/list.h>
41 #include <linux/kref.h>
42 #include <linux/sunrpc/clnt.h>
44 #define NFS4_OPAQUE_LIMIT 1024
58 stateid_opaque_t si_opaque;
60 #define si_boot si_opaque.so_boot
61 #define si_stateownerid si_opaque.so_stateownerid
62 #define si_fileid si_opaque.so_fileid
64 extern stateid_t zerostateid;
65 extern stateid_t onestateid;
67 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
68 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
70 struct nfs4_cb_recall {
73 stateid_t cbr_stateid;
75 u32 cbr_fhval[NFS4_FHSIZE];
76 struct nfs4_delegation *cbr_dp;
79 struct nfs4_delegation {
80 struct list_head dl_del_perfile; /* nfs4_file->fi_del_perfile */
81 struct list_head dl_del_perclnt; /* nfs4_client->cl_del_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 struct file_lock *dl_flock;
87 struct file *dl_vfs_file;
90 struct nfs4_cb_recall dl_recall;
93 #define dl_stateid dl_recall.cbr_stateid
94 #define dl_fhlen dl_recall.cbr_fhlen
95 #define dl_fhval dl_recall.cbr_fhval
97 /* client delegation callback info */
98 struct nfs4_callback {
99 /* SETCLIENTID info */
100 u32 cb_parsed; /* addr parsed */
102 unsigned short cb_port;
105 /* RPC client info */
106 atomic_t cb_set; /* successful CB_NULL call */
107 struct rpc_program cb_program;
108 struct rpc_stat cb_stat;
109 struct rpc_clnt * cb_client;
112 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
115 * struct nfs4_client - one per client. Clientids live here.
116 * o Each nfs4_client is hashed by clientid.
118 * o Each nfs4_clients is also hashed by name
119 * (the opaque quantity initially sent by the client to identify itself).
121 * o cl_perclient list is used to ensure no dangling stateowner references
122 * when we expire the nfs4_client
125 struct list_head cl_idhash; /* hash by cl_clientid.id */
126 struct list_head cl_strhash; /* hash by cl_name */
127 struct list_head cl_perclient; /* list: stateowners */
128 struct list_head cl_del_perclnt; /* list: delegations */
129 struct list_head cl_lru; /* tail queue */
130 struct xdr_netobj cl_name; /* id generated by client */
131 char cl_recdir[HEXDIR_LEN]; /* recovery dir */
132 nfs4_verifier cl_verifier; /* generated by client */
133 time_t cl_time; /* time of last lease renewal */
134 u32 cl_addr; /* client ipaddress */
135 struct svc_cred cl_cred; /* setclientid principal */
136 clientid_t cl_clientid; /* generated by server */
137 nfs4_verifier cl_confirm; /* generated by server */
138 struct nfs4_callback cl_callback; /* callback info */
139 atomic_t cl_count; /* ref count */
142 /* struct nfs4_client_reset
143 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
144 * upon lease reset, or from upcall to state_daemon (to read in state
145 * from non-volitile storage) upon reboot.
147 struct nfs4_client_reclaim {
148 struct list_head cr_strhash; /* hash by cr_name */
149 char cr_recdir[HEXDIR_LEN]; /* recover dir */
153 update_stateid(stateid_t *stateid)
155 stateid->si_generation++;
158 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
159 * The OPEN response, typically the largest, requires
160 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
161 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
162 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
165 #define NFSD4_REPLAY_ISIZE 112
168 * Replay buffer, where the result of the last seqid-mutating operation
173 unsigned int rp_buflen;
175 unsigned intrp_allocated;
177 char rp_openfh[NFS4_FHSIZE];
178 char rp_ibuf[NFSD4_REPLAY_ISIZE];
182 * nfs4_stateowner can either be an open_owner, or a lock_owner
184 * so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
186 * so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
188 * so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
190 * so_perfilestate: heads the list of nfs4_stateid (either open or lock)
191 * and is used to ensure no dangling nfs4_stateid references when we
192 * release a stateowner.
193 * so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
194 * close is called to reap associated byte-range locks
195 * so_close_lru: (open) stateowner is placed on this list instead of being
196 * reaped (when so_perfilestate is empty) to hold the last close replay.
197 * reaped by laundramat thread after lease period.
199 struct nfs4_stateowner {
201 struct list_head so_idhash; /* hash by so_id */
202 struct list_head so_strhash; /* hash by op_name */
203 struct list_head so_perclient; /* nfs4_client->cl_perclient */
204 struct list_head so_perfilestate; /* list: nfs4_stateid */
205 struct list_head so_perlockowner; /* nfs4_stateid->st_perlockowner */
206 struct list_head so_close_lru; /* tail queue */
207 time_t so_time; /* time of placement on so_close_lru */
208 int so_is_open_owner; /* 1=openowner,0=lockowner */
210 struct nfs4_client * so_client;
212 struct xdr_netobj so_owner; /* open owner name */
213 int so_confirmed; /* successful OPEN_CONFIRM? */
214 struct nfs4_replay so_replay;
218 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
219 * o fi_perfile list is used to search for conflicting
220 * share_acces, share_deny on the file.
224 struct list_head fi_hash; /* hash by "struct inode *" */
225 struct list_head fi_stateids;
226 struct list_head fi_delegations;
227 struct inode *fi_inode;
228 u32 fi_id; /* used with stateowner->so_id
229 * for stateid_hashtbl hash */
233 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
235 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
237 * st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
238 * st_perfile: file_hashtbl[] entry.
239 * st_perfile_state: nfs4_stateowner->so_perfilestate
240 * st_perlockowner: (open stateid) list of lock nfs4_stateowners
241 * st_access_bmap: used only for open stateid
242 * st_deny_bmap: used only for open stateid
245 struct nfs4_stateid {
246 struct list_head st_hash;
247 struct list_head st_perfile;
248 struct list_head st_perfilestate;
249 struct list_head st_perlockowner;
250 struct nfs4_stateowner * st_stateowner;
251 struct nfs4_file * st_file;
252 stateid_t st_stateid;
253 struct file * st_vfs_file;
254 unsigned long st_access_bmap;
255 unsigned long st_deny_bmap;
258 /* flags for preprocess_seqid_op() */
259 #define CHECK_FH 0x00000001
260 #define CONFIRM 0x00000002
261 #define OPEN_STATE 0x00000004
262 #define LOCK_STATE 0x00000008
263 #define RD_STATE 0x00000010
264 #define WR_STATE 0x00000020
265 #define CLOSE_STATE 0x00000040
266 #define DELEG_RET 0x00000080
268 #define seqid_mutating_err(err) \
269 (((err) != nfserr_stale_clientid) && \
270 ((err) != nfserr_bad_seqid) && \
271 ((err) != nfserr_stale_stateid) && \
272 ((err) != nfserr_bad_stateid))
274 extern time_t nfs4_laundromat(void);
275 extern int nfsd4_renew(clientid_t *clid);
276 extern int nfs4_preprocess_stateid_op(struct svc_fh *current_fh,
277 stateid_t *stateid, int flags, struct file **filp);
278 extern int nfs4_share_conflict(struct svc_fh *current_fh,
279 unsigned int deny_type);
280 extern void nfs4_lock_state(void);
281 extern void nfs4_unlock_state(void);
282 extern int nfs4_in_grace(void);
283 extern int nfs4_check_open_reclaim(clientid_t *clid);
284 extern void put_nfs4_client(struct nfs4_client *clp);
285 extern void nfs4_free_stateowner(struct kref *kref);
286 extern void nfsd4_probe_callback(struct nfs4_client *clp);
287 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
288 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
289 extern int nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
292 nfs4_put_stateowner(struct nfs4_stateowner *so)
294 kref_put(&so->so_ref, nfs4_free_stateowner);
298 nfs4_get_stateowner(struct nfs4_stateowner *so)
300 kref_get(&so->so_ref);
303 #endif /* NFSD4_STATE_H */