2 * Copyright (c) 2001 The Regents of the University of Michigan.
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
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17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
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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/refcount.h>
40 #include <linux/sunrpc/svc_xprt.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 {
66 struct nfs4_client *cb_clp;
67 struct rpc_message cb_msg;
68 const struct nfsd4_callback_ops *cb_ops;
69 struct work_struct cb_work;
76 struct nfsd4_callback_ops {
77 void (*prepare)(struct nfsd4_callback *);
78 int (*done)(struct nfsd4_callback *, struct rpc_task *);
79 void (*release)(struct nfsd4_callback *);
83 * A core object that represents a "common" stateid. These are generally
84 * embedded within the different (more specific) stateid objects and contain
85 * fields that are of general use to any stateid.
89 #define NFS4_OPEN_STID 1
90 #define NFS4_LOCK_STID 2
91 #define NFS4_DELEG_STID 4
92 /* For an open stateid kept around *only* to process close replays: */
93 #define NFS4_CLOSED_STID 8
94 /* For a deleg stateid kept around only to process free_stateid's: */
95 #define NFS4_REVOKED_DELEG_STID 16
96 #define NFS4_CLOSED_DELEG_STID 32
97 #define NFS4_LAYOUT_STID 64
98 unsigned char sc_type;
101 struct nfs4_client *sc_client;
102 struct nfs4_file *sc_file;
103 void (*sc_free)(struct nfs4_stid *);
107 * Represents a delegation stateid. The nfs4_client holds references to these
108 * and they are put when it is being destroyed or when the delegation is
109 * returned by the client:
111 * o 1 reference as long as a delegation is still in force (taken when it's
112 * alloc'd, put when it's returned or revoked)
114 * o 1 reference as long as a recall rpc is in progress (taken when the lease
115 * is broken, put when the rpc exits)
117 * o 1 more ephemeral reference for each nfsd thread currently doing something
118 * with that delegation without holding the cl_lock
120 * If the server attempts to recall a delegation and the client doesn't do so
121 * before a timeout, the server may also revoke the delegation. In that case,
122 * the object will either be destroyed (v4.0) or moved to a per-client list of
123 * revoked delegations (v4.1+).
125 * This object is a superset of the nfs4_stid.
127 struct nfs4_delegation {
128 struct nfs4_stid dl_stid; /* must be first field */
129 struct list_head dl_perfile;
130 struct list_head dl_perclnt;
131 struct list_head dl_recall_lru; /* delegation recalled */
132 struct nfs4_clnt_odstate *dl_clnt_odstate;
137 struct nfsd4_callback dl_recall;
140 #define cb_to_delegation(cb) \
141 container_of(cb, struct nfs4_delegation, dl_recall)
143 /* client delegation callback info */
144 struct nfs4_cb_conn {
145 /* SETCLIENTID info */
146 struct sockaddr_storage cb_addr;
147 struct sockaddr_storage cb_saddr;
149 u32 cb_prog; /* used only in 4.0 case;
150 per-session otherwise */
151 u32 cb_ident; /* minorversion 0 only */
152 struct svc_xprt *cb_xprt; /* minorversion 1 only */
155 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
157 return container_of(s, struct nfs4_delegation, dl_stid);
160 /* Maximum number of slots per session. 160 is useful for long haul TCP */
161 #define NFSD_MAX_SLOTS_PER_SESSION 160
162 /* Maximum number of operations per session compound */
163 #define NFSD_MAX_OPS_PER_COMPOUND 16
164 /* Maximum session per slot cache size */
165 #define NFSD_SLOT_CACHE_SIZE 2048
166 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
167 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
168 #define NFSD_MAX_MEM_PER_SESSION \
169 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
174 struct svc_cred sl_cred;
177 #define NFSD4_SLOT_INUSE (1 << 0)
178 #define NFSD4_SLOT_CACHETHIS (1 << 1)
179 #define NFSD4_SLOT_INITIALIZED (1 << 2)
180 #define NFSD4_SLOT_CACHED (1 << 3)
185 struct nfsd4_channel_attrs {
196 struct nfsd4_cb_sec {
197 u32 flavor; /* (u32)(-1) used to mean "no valid flavor" */
202 struct nfsd4_create_session {
204 struct nfs4_sessionid sessionid;
207 struct nfsd4_channel_attrs fore_channel;
208 struct nfsd4_channel_attrs back_channel;
210 struct nfsd4_cb_sec cb_sec;
213 struct nfsd4_backchannel_ctl {
215 struct nfsd4_cb_sec bc_cb_sec;
218 struct nfsd4_bind_conn_to_session {
219 struct nfs4_sessionid sessionid;
223 /* The single slot clientid cache structure */
224 struct nfsd4_clid_slot {
227 struct nfsd4_create_session sl_cr_ses;
231 struct list_head cn_persession;
232 struct svc_xprt *cn_xprt;
233 struct svc_xpt_user cn_xpt_user;
234 struct nfsd4_session *cn_session;
235 /* CDFC4_FORE, CDFC4_BACK: */
236 unsigned char cn_flags;
240 * Representation of a v4.1+ session. These are refcounted in a similar fashion
241 * to the nfs4_client. References are only taken when the server is actively
242 * working on the object (primarily during the processing of compounds).
244 struct nfsd4_session {
246 struct list_head se_hash; /* hash by sessionid */
247 struct list_head se_perclnt;
248 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
249 #define NFS4_SESSION_DEAD 0x010
251 struct nfs4_client *se_client;
252 struct nfs4_sessionid se_sessionid;
253 struct nfsd4_channel_attrs se_fchannel;
254 struct nfsd4_channel_attrs se_bchannel;
255 struct nfsd4_cb_sec se_cb_sec;
256 struct list_head se_conns;
259 struct nfsd4_slot *se_slots[]; /* forward channel slots */
262 /* formatted contents of nfs4_sessionid */
263 struct nfsd4_sessionid {
269 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
272 * struct nfs4_client - one per client. Clientids live here.
274 * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
275 * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
276 * Each nfsd_net_ns object contains a set of these and they are tracked via
277 * short and long form clientid. They are hashed and searched for under the
278 * per-nfsd_net client_lock spinlock.
280 * References to it are only held during the processing of compounds, and in
281 * certain other operations. In their "resting state" they have a refcount of
282 * 0. If they are not renewed within a lease period, they become eligible for
283 * destruction by the laundromat.
285 * These objects can also be destroyed prematurely by the fault injection code,
286 * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
287 * Care is taken *not* to do this however when the objects have an elevated
290 * o Each nfs4_client is hashed by clientid
292 * o Each nfs4_clients is also hashed by name (the opaque quantity initially
293 * sent by the client to identify itself).
295 * o cl_perclient list is used to ensure no dangling stateowner references
296 * when we expire the nfs4_client
299 struct list_head cl_idhash; /* hash by cl_clientid.id */
300 struct rb_node cl_namenode; /* link into by-name trees */
301 struct list_head *cl_ownerstr_hashtbl;
302 struct list_head cl_openowners;
303 struct idr cl_stateids; /* stateid lookup */
304 struct list_head cl_delegations;
305 struct list_head cl_revoked; /* unacknowledged, revoked 4.1 state */
306 struct list_head cl_lru; /* tail queue */
307 #ifdef CONFIG_NFSD_PNFS
308 struct list_head cl_lo_states; /* outstanding layout states */
310 struct xdr_netobj cl_name; /* id generated by client */
311 nfs4_verifier cl_verifier; /* generated by client */
312 time_t cl_time; /* time of last lease renewal */
313 struct sockaddr_storage cl_addr; /* client ipaddress */
314 bool cl_mach_cred; /* SP4_MACH_CRED in force */
315 struct svc_cred cl_cred; /* setclientid principal */
316 clientid_t cl_clientid; /* generated by server */
317 nfs4_verifier cl_confirm; /* generated by server */
320 /* for v4.0 and v4.1 callbacks: */
321 struct nfs4_cb_conn cl_cb_conn;
322 #define NFSD4_CLIENT_CB_UPDATE (0)
323 #define NFSD4_CLIENT_CB_KILL (1)
324 #define NFSD4_CLIENT_STABLE (2) /* client on stable storage */
325 #define NFSD4_CLIENT_RECLAIM_COMPLETE (3) /* reclaim_complete done */
326 #define NFSD4_CLIENT_CONFIRMED (4) /* client is confirmed */
327 #define NFSD4_CLIENT_UPCALL_LOCK (5) /* upcall serialization */
328 #define NFSD4_CLIENT_CB_FLAG_MASK (1 << NFSD4_CLIENT_CB_UPDATE | \
329 1 << NFSD4_CLIENT_CB_KILL)
330 unsigned long cl_flags;
331 const struct cred *cl_cb_cred;
332 struct rpc_clnt *cl_cb_client;
334 #define NFSD4_CB_UP 0
335 #define NFSD4_CB_UNKNOWN 1
336 #define NFSD4_CB_DOWN 2
337 #define NFSD4_CB_FAULT 3
339 struct nfsd4_callback cl_cb_null;
340 struct nfsd4_session *cl_cb_session;
342 /* for all client information that callback code might need: */
346 struct list_head cl_sessions;
347 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
348 u32 cl_exchange_flags;
349 /* number of rpc's in progress over an associated session: */
350 atomic_t cl_refcount;
351 struct nfs4_op_map cl_spo_must_allow;
353 /* for nfs41 callbacks */
354 /* We currently support a single back channel with a single slot */
355 unsigned long cl_cb_slot_busy;
356 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
357 /* wait here for slots */
359 struct list_head async_copies; /* list of async copies */
360 spinlock_t async_lock; /* lock for async copies */
363 /* struct nfs4_client_reset
364 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
365 * upon lease reset, or from upcall to state_daemon (to read in state
366 * from non-volitile storage) upon reboot.
368 struct nfs4_client_reclaim {
369 struct list_head cr_strhash; /* hash by cr_name */
370 struct nfs4_client *cr_clp; /* pointer to associated clp */
371 struct xdr_netobj cr_name; /* recovery dir name */
374 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
375 * The OPEN response, typically the largest, requires
376 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
377 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
378 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
381 #define NFSD4_REPLAY_ISIZE 112
384 * Replay buffer, where the result of the last seqid-mutating operation
389 unsigned int rp_buflen;
391 struct knfsd_fh rp_openfh;
392 struct mutex rp_mutex;
393 char rp_ibuf[NFSD4_REPLAY_ISIZE];
396 struct nfs4_stateowner;
398 struct nfs4_stateowner_operations {
399 void (*so_unhash)(struct nfs4_stateowner *);
400 void (*so_free)(struct nfs4_stateowner *);
404 * A core object that represents either an open or lock owner. The object and
405 * lock owner objects have one of these embedded within them. Refcounts and
406 * other fields common to both owner types are contained within these
409 struct nfs4_stateowner {
410 struct list_head so_strhash;
411 struct list_head so_stateids;
412 struct nfs4_client *so_client;
413 const struct nfs4_stateowner_operations *so_ops;
414 /* after increment in nfsd4_bump_seqid, represents the next
415 * sequence id expected from the client: */
418 struct xdr_netobj so_owner; /* open owner name */
419 struct nfs4_replay so_replay;
420 bool so_is_open_owner;
424 * When a file is opened, the client provides an open state owner opaque string
425 * that indicates the "owner" of that open. These objects are refcounted.
426 * References to it are held by each open state associated with it. This object
427 * is a superset of the nfs4_stateowner struct.
429 struct nfs4_openowner {
430 struct nfs4_stateowner oo_owner; /* must be first field */
431 struct list_head oo_perclient;
433 * We keep around openowners a little while after last close,
434 * which saves clients from having to confirm, and allows us to
435 * handle close replays if they come soon enough. The close_lru
436 * is a list of such openowners, to be reaped by the laundromat
437 * thread eventually if they remain unused:
439 struct list_head oo_close_lru;
440 struct nfs4_ol_stateid *oo_last_closed_stid;
441 time_t oo_time; /* time of placement on so_close_lru */
442 #define NFS4_OO_CONFIRMED 1
443 unsigned char oo_flags;
447 * Represents a generic "lockowner". Similar to an openowner. References to it
448 * are held by the lock stateids that are created on its behalf. This object is
449 * a superset of the nfs4_stateowner struct.
451 struct nfs4_lockowner {
452 struct nfs4_stateowner lo_owner; /* must be first element */
453 struct list_head lo_blocked; /* blocked file_locks */
456 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
458 return container_of(so, struct nfs4_openowner, oo_owner);
461 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
463 return container_of(so, struct nfs4_lockowner, lo_owner);
467 * Per-client state indicating no. of opens and outstanding delegations
468 * on a file from a particular client.'od' stands for 'open & delegation'
470 struct nfs4_clnt_odstate {
471 struct nfs4_client *co_client;
472 struct nfs4_file *co_file;
473 struct list_head co_perfile;
474 refcount_t co_odcount;
478 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
480 * These objects are global. nfsd keeps one instance of a nfs4_file per
481 * filehandle (though it may keep multiple file descriptors for each). Each
482 * inode can have multiple filehandles associated with it, so there is
483 * (potentially) a many to one relationship between this struct and struct
486 * These are hashed by filehandle in the file_hashtbl, which is protected by
487 * the global state_lock spinlock.
492 struct hlist_node fi_hash; /* hash on fi_fhandle */
493 struct list_head fi_stateids;
495 struct list_head fi_delegations;
496 struct rcu_head fi_rcu;
498 struct list_head fi_clnt_odstate;
499 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
500 struct file * fi_fds[3];
502 * Each open or lock stateid contributes 0-4 to the counts
503 * below depending on which bits are set in st_access_bitmap:
504 * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
505 * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
506 * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
508 atomic_t fi_access[2];
510 struct file *fi_deleg_file;
512 struct knfsd_fh fi_fhandle;
513 bool fi_had_conflict;
514 #ifdef CONFIG_NFSD_PNFS
515 struct list_head fi_lo_states;
516 atomic_t fi_lo_recalls;
521 * A generic struct representing either a open or lock stateid. The nfs4_client
522 * holds a reference to each of these objects, and they in turn hold a
523 * reference to their respective stateowners. The client's reference is
524 * released in response to a close or unlock (depending on whether it's an open
525 * or lock stateid) or when the client is being destroyed.
527 * In the case of v4.0 open stateids, these objects are preserved for a little
528 * while after close in order to handle CLOSE replays. Those are eventually
529 * reclaimed via a LRU scheme by the laundromat.
531 * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
532 * Better suggestions welcome.
534 struct nfs4_ol_stateid {
535 struct nfs4_stid st_stid;
536 struct list_head st_perfile;
537 struct list_head st_perstateowner;
538 struct list_head st_locks;
539 struct nfs4_stateowner *st_stateowner;
540 struct nfs4_clnt_odstate *st_clnt_odstate;
541 unsigned char st_access_bmap;
542 unsigned char st_deny_bmap;
543 struct nfs4_ol_stateid *st_openstp;
544 struct mutex st_mutex;
547 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
549 return container_of(s, struct nfs4_ol_stateid, st_stid);
552 struct nfs4_layout_stateid {
553 struct nfs4_stid ls_stid;
554 struct list_head ls_perclnt;
555 struct list_head ls_perfile;
557 struct list_head ls_layouts;
559 struct file *ls_file;
560 struct nfsd4_callback ls_recall;
561 stateid_t ls_recall_sid;
563 struct mutex ls_mutex;
566 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
568 return container_of(s, struct nfs4_layout_stateid, ls_stid);
571 /* flags for preprocess_seqid_op() */
572 #define RD_STATE 0x00000010
573 #define WR_STATE 0x00000020
576 NFSPROC4_CLNT_CB_NULL = 0,
577 NFSPROC4_CLNT_CB_RECALL,
578 NFSPROC4_CLNT_CB_LAYOUT,
579 NFSPROC4_CLNT_CB_OFFLOAD,
580 NFSPROC4_CLNT_CB_SEQUENCE,
581 NFSPROC4_CLNT_CB_NOTIFY_LOCK,
584 /* Returns true iff a is later than b: */
585 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
587 return (s32)(a->si_generation - b->si_generation) > 0;
591 * When a client tries to get a lock on a file, we set one of these objects
592 * on the blocking lock. When the lock becomes free, we can then issue a
593 * CB_NOTIFY_LOCK to the server.
595 struct nfsd4_blocked_lock {
596 struct list_head nbl_list;
597 struct list_head nbl_lru;
598 unsigned long nbl_time;
599 struct file_lock nbl_lock;
600 struct knfsd_fh nbl_fh;
601 struct nfsd4_callback nbl_cb;
604 struct nfsd4_compound_state;
608 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
609 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
610 stateid_t *stateid, int flags, struct file **filp, bool *tmp_file);
611 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
612 stateid_t *stateid, unsigned char typemask,
613 struct nfs4_stid **s, struct nfsd_net *nn);
614 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
615 void (*sc_free)(struct nfs4_stid *));
616 int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy);
617 void nfs4_free_cp_state(struct nfsd4_copy *copy);
618 void nfs4_unhash_stid(struct nfs4_stid *s);
619 void nfs4_put_stid(struct nfs4_stid *s);
620 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
621 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
622 extern void nfs4_release_reclaim(struct nfsd_net *);
623 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name,
624 struct nfsd_net *nn);
625 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
626 struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
627 extern void nfsd4_probe_callback(struct nfs4_client *clp);
628 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
629 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
630 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
631 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
632 extern void nfsd4_run_cb(struct nfsd4_callback *cb);
633 extern int nfsd4_create_callback_queue(void);
634 extern void nfsd4_destroy_callback_queue(void);
635 extern void nfsd4_shutdown_callback(struct nfs4_client *);
636 extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
637 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
638 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name,
639 struct nfsd_net *nn);
640 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn);
642 struct nfs4_file *find_file(struct knfsd_fh *fh);
643 void put_nfs4_file(struct nfs4_file *fi);
644 extern void nfs4_put_copy(struct nfsd4_copy *copy);
645 extern struct nfsd4_copy *
646 find_async_copy(struct nfs4_client *clp, stateid_t *staetid);
647 static inline void get_nfs4_file(struct nfs4_file *fi)
649 refcount_inc(&fi->fi_ref);
651 struct file *find_any_file(struct nfs4_file *f);
653 /* grace period management */
654 void nfsd4_end_grace(struct nfsd_net *nn);
656 /* nfs4recover operations */
657 extern int nfsd4_client_tracking_init(struct net *net);
658 extern void nfsd4_client_tracking_exit(struct net *net);
659 extern void nfsd4_client_record_create(struct nfs4_client *clp);
660 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
661 extern int nfsd4_client_record_check(struct nfs4_client *clp);
662 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
664 /* nfs fault injection functions */
665 #ifdef CONFIG_NFSD_FAULT_INJECTION
666 int nfsd_fault_inject_init(void);
667 void nfsd_fault_inject_cleanup(void);
669 u64 nfsd_inject_print_clients(void);
670 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t);
671 u64 nfsd_inject_forget_clients(u64);
673 u64 nfsd_inject_print_locks(void);
674 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t);
675 u64 nfsd_inject_forget_locks(u64);
677 u64 nfsd_inject_print_openowners(void);
678 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t);
679 u64 nfsd_inject_forget_openowners(u64);
681 u64 nfsd_inject_print_delegations(void);
682 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t);
683 u64 nfsd_inject_forget_delegations(u64);
684 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t);
685 u64 nfsd_inject_recall_delegations(u64);
686 #else /* CONFIG_NFSD_FAULT_INJECTION */
687 static inline int nfsd_fault_inject_init(void) { return 0; }
688 static inline void nfsd_fault_inject_cleanup(void) {}
689 #endif /* CONFIG_NFSD_FAULT_INJECTION */
691 #endif /* NFSD4_STATE_H */