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/idr.h>
39 #include <linux/sunrpc/svc_xprt.h>
40 #include <linux/nfsd/nfsfh.h>
55 stateid_opaque_t si_opaque;
58 #define STATEID_FMT "(%08x/%08x/%08x/%08x)"
59 #define STATEID_VAL(s) \
60 (s)->si_opaque.so_clid.cl_boot, \
61 (s)->si_opaque.so_clid.cl_id, \
62 (s)->si_opaque.so_id, \
65 struct nfsd4_callback {
67 struct nfs4_client *cb_clp;
68 struct list_head cb_per_client;
70 struct rpc_message cb_msg;
71 const struct rpc_call_ops *cb_ops;
72 struct work_struct cb_work;
77 #define NFS4_OPEN_STID 1
78 #define NFS4_LOCK_STID 2
79 #define NFS4_DELEG_STID 4
80 /* For an open stateid kept around *only* to process close replays: */
81 #define NFS4_CLOSED_STID 8
82 unsigned char sc_type;
84 struct nfs4_client *sc_client;
87 struct nfs4_delegation {
88 struct nfs4_stid dl_stid; /* must be first field */
89 struct list_head dl_perfile;
90 struct list_head dl_perclnt;
91 struct list_head dl_recall_lru; /* delegation recalled */
92 atomic_t dl_count; /* ref count */
93 struct nfs4_file *dl_file;
97 struct knfsd_fh dl_fh;
99 struct nfsd4_callback dl_recall;
102 /* client delegation callback info */
103 struct nfs4_cb_conn {
104 /* SETCLIENTID info */
105 struct sockaddr_storage cb_addr;
106 struct sockaddr_storage cb_saddr;
108 u32 cb_prog; /* used only in 4.0 case;
109 per-session otherwise */
110 u32 cb_ident; /* minorversion 0 only */
111 struct svc_xprt *cb_xprt; /* minorversion 1 only */
114 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
116 return container_of(s, struct nfs4_delegation, dl_stid);
119 /* Maximum number of slots per session. 160 is useful for long haul TCP */
120 #define NFSD_MAX_SLOTS_PER_SESSION 160
121 /* Maximum number of operations per session compound */
122 #define NFSD_MAX_OPS_PER_COMPOUND 16
123 /* Maximum session per slot cache size */
124 #define NFSD_SLOT_CACHE_SIZE 1024
125 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
126 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
127 #define NFSD_MAX_MEM_PER_SESSION \
128 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
140 struct nfsd4_channel_attrs {
151 struct nfsd4_create_session {
153 struct nfs4_sessionid sessionid;
156 struct nfsd4_channel_attrs fore_channel;
157 struct nfsd4_channel_attrs back_channel;
163 struct nfsd4_bind_conn_to_session {
164 struct nfs4_sessionid sessionid;
168 /* The single slot clientid cache structure */
169 struct nfsd4_clid_slot {
172 struct nfsd4_create_session sl_cr_ses;
176 struct list_head cn_persession;
177 struct svc_xprt *cn_xprt;
178 struct svc_xpt_user cn_xpt_user;
179 struct nfsd4_session *cn_session;
180 /* CDFC4_FORE, CDFC4_BACK: */
181 unsigned char cn_flags;
184 struct nfsd4_session {
186 struct list_head se_hash; /* hash by sessionid */
187 struct list_head se_perclnt;
189 struct nfs4_client *se_client;
190 struct nfs4_sessionid se_sessionid;
191 struct nfsd4_channel_attrs se_fchannel;
192 struct nfsd4_channel_attrs se_bchannel;
193 struct list_head se_conns;
196 struct nfsd4_slot *se_slots[]; /* forward channel slots */
200 nfsd4_put_session(struct nfsd4_session *ses)
202 extern void free_session(struct kref *kref);
203 kref_put(&ses->se_ref, free_session);
207 nfsd4_get_session(struct nfsd4_session *ses)
209 kref_get(&ses->se_ref);
212 /* formatted contents of nfs4_sessionid */
213 struct nfsd4_sessionid {
219 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
222 * struct nfs4_client - one per client. Clientids live here.
223 * o Each nfs4_client is hashed by clientid.
225 * o Each nfs4_clients is also hashed by name
226 * (the opaque quantity initially sent by the client to identify itself).
228 * o cl_perclient list is used to ensure no dangling stateowner references
229 * when we expire the nfs4_client
232 struct list_head cl_idhash; /* hash by cl_clientid.id */
233 struct list_head cl_strhash; /* hash by cl_name */
234 struct list_head cl_openowners;
235 struct idr cl_stateids; /* stateid lookup */
236 struct list_head cl_delegations;
237 struct list_head cl_lru; /* tail queue */
238 struct xdr_netobj cl_name; /* id generated by client */
239 char cl_recdir[HEXDIR_LEN]; /* recovery dir */
240 nfs4_verifier cl_verifier; /* generated by client */
241 time_t cl_time; /* time of last lease renewal */
242 struct sockaddr_storage cl_addr; /* client ipaddress */
243 u32 cl_flavor; /* setclientid pseudoflavor */
244 char *cl_principal; /* setclientid principal name */
245 struct svc_cred cl_cred; /* setclientid principal */
246 clientid_t cl_clientid; /* generated by server */
247 nfs4_verifier cl_confirm; /* generated by server */
248 u32 cl_firststate; /* recovery dir creation */
251 /* for v4.0 and v4.1 callbacks: */
252 struct nfs4_cb_conn cl_cb_conn;
253 #define NFSD4_CLIENT_CB_UPDATE 1
254 #define NFSD4_CLIENT_KILL 2
255 unsigned long cl_cb_flags;
256 struct rpc_clnt *cl_cb_client;
258 #define NFSD4_CB_UP 0
259 #define NFSD4_CB_UNKNOWN 1
260 #define NFSD4_CB_DOWN 2
261 #define NFSD4_CB_FAULT 3
263 struct nfsd4_callback cl_cb_null;
264 struct nfsd4_session *cl_cb_session;
265 struct list_head cl_callbacks; /* list of in-progress callbacks */
267 /* for all client information that callback code might need: */
271 struct list_head cl_sessions;
272 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
273 u32 cl_exchange_flags;
274 /* number of rpc's in progress over an associated session: */
275 atomic_t cl_refcount;
277 /* for nfs41 callbacks */
278 /* We currently support a single back channel with a single slot */
279 unsigned long cl_cb_slot_busy;
280 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
281 /* wait here for slots */
285 mark_client_expired(struct nfs4_client *clp)
291 is_client_expired(struct nfs4_client *clp)
293 return clp->cl_time == 0;
296 /* struct nfs4_client_reset
297 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
298 * upon lease reset, or from upcall to state_daemon (to read in state
299 * from non-volitile storage) upon reboot.
301 struct nfs4_client_reclaim {
302 struct list_head cr_strhash; /* hash by cr_name */
303 char cr_recdir[HEXDIR_LEN]; /* recover dir */
307 update_stateid(stateid_t *stateid)
309 stateid->si_generation++;
310 /* Wraparound recommendation from 3530bis-13 9.1.3.2: */
311 if (stateid->si_generation == 0)
312 stateid->si_generation = 1;
315 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
316 * The OPEN response, typically the largest, requires
317 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
318 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
319 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
322 #define NFSD4_REPLAY_ISIZE 112
325 * Replay buffer, where the result of the last seqid-mutating operation
330 unsigned int rp_buflen;
332 struct knfsd_fh rp_openfh;
333 char rp_ibuf[NFSD4_REPLAY_ISIZE];
336 struct nfs4_stateowner {
337 struct list_head so_strhash; /* hash by op_name */
338 struct list_head so_stateids;
339 struct nfs4_client * so_client;
340 /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
341 * sequence id expected from the client: */
343 struct xdr_netobj so_owner; /* open owner name */
344 struct nfs4_replay so_replay;
345 bool so_is_open_owner;
348 struct nfs4_openowner {
349 struct nfs4_stateowner oo_owner; /* must be first field */
350 struct list_head oo_perclient;
352 * We keep around openowners a little while after last close,
353 * which saves clients from having to confirm, and allows us to
354 * handle close replays if they come soon enough. The close_lru
355 * is a list of such openowners, to be reaped by the laundromat
356 * thread eventually if they remain unused:
358 struct list_head oo_close_lru;
359 struct nfs4_ol_stateid *oo_last_closed_stid;
360 time_t oo_time; /* time of placement on so_close_lru */
361 #define NFS4_OO_CONFIRMED 1
362 #define NFS4_OO_PURGE_CLOSE 2
363 #define NFS4_OO_NEW 4
364 unsigned char oo_flags;
367 struct nfs4_lockowner {
368 struct nfs4_stateowner lo_owner; /* must be first element */
369 struct list_head lo_owner_ino_hash; /* hash by owner,file */
370 struct list_head lo_perstateid; /* for lockowners only */
371 struct list_head lo_list; /* for temporary uses */
374 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
376 return container_of(so, struct nfs4_openowner, oo_owner);
379 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
381 return container_of(so, struct nfs4_lockowner, lo_owner);
385 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
386 * o fi_perfile list is used to search for conflicting
387 * share_acces, share_deny on the file.
391 struct list_head fi_hash; /* hash by "struct inode *" */
392 struct list_head fi_stateids;
393 struct list_head fi_delegations;
394 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
395 struct file * fi_fds[3];
397 * Each open or lock stateid contributes 0-4 to the counts
398 * below depending on which bits are set in st_access_bitmap:
399 * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
400 * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
401 * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
403 atomic_t fi_access[2];
404 struct file *fi_deleg_file;
405 struct file_lock *fi_lease;
406 atomic_t fi_delegees;
407 struct inode *fi_inode;
408 bool fi_had_conflict;
411 /* XXX: for first cut may fall back on returning file that doesn't work
413 static inline struct file *find_writeable_file(struct nfs4_file *f)
415 if (f->fi_fds[O_WRONLY])
416 return f->fi_fds[O_WRONLY];
417 return f->fi_fds[O_RDWR];
420 static inline struct file *find_readable_file(struct nfs4_file *f)
422 if (f->fi_fds[O_RDONLY])
423 return f->fi_fds[O_RDONLY];
424 return f->fi_fds[O_RDWR];
427 static inline struct file *find_any_file(struct nfs4_file *f)
429 if (f->fi_fds[O_RDWR])
430 return f->fi_fds[O_RDWR];
431 else if (f->fi_fds[O_WRONLY])
432 return f->fi_fds[O_WRONLY];
434 return f->fi_fds[O_RDONLY];
437 /* "ol" stands for "Open or Lock". Better suggestions welcome. */
438 struct nfs4_ol_stateid {
439 struct nfs4_stid st_stid; /* must be first field */
440 struct list_head st_perfile;
441 struct list_head st_perstateowner;
442 struct list_head st_lockowners;
443 struct nfs4_stateowner * st_stateowner;
444 struct nfs4_file * st_file;
445 unsigned long st_access_bmap;
446 unsigned long st_deny_bmap;
447 struct nfs4_ol_stateid * st_openstp;
450 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
452 return container_of(s, struct nfs4_ol_stateid, st_stid);
455 /* flags for preprocess_seqid_op() */
456 #define RD_STATE 0x00000010
457 #define WR_STATE 0x00000020
459 struct nfsd4_compound_state;
461 extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
462 stateid_t *stateid, int flags, struct file **filp);
463 extern void nfs4_lock_state(void);
464 extern void nfs4_unlock_state(void);
465 extern int nfs4_in_grace(void);
466 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
467 extern void nfs4_free_openowner(struct nfs4_openowner *);
468 extern void nfs4_free_lockowner(struct nfs4_lockowner *);
469 extern int set_callback_cred(void);
470 extern void nfsd4_probe_callback(struct nfs4_client *clp);
471 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
472 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
473 extern void nfsd4_do_callback_rpc(struct work_struct *);
474 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
475 extern int nfsd4_create_callback_queue(void);
476 extern void nfsd4_destroy_callback_queue(void);
477 extern void nfsd4_shutdown_callback(struct nfs4_client *);
478 extern void nfs4_put_delegation(struct nfs4_delegation *dp);
479 extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
480 extern void nfsd4_init_recdir(void);
481 extern int nfsd4_recdir_load(void);
482 extern void nfsd4_shutdown_recdir(void);
483 extern int nfs4_client_to_reclaim(const char *name);
484 extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
485 extern void nfsd4_recdir_purge_old(void);
486 extern void nfsd4_create_clid_dir(struct nfs4_client *clp);
487 extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
488 extern void release_session_client(struct nfsd4_session *);
489 extern __be32 nfs4_validate_stateid(struct nfs4_client *, stateid_t *);
490 extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *);
492 #endif /* NFSD4_STATE_H */