Loading...
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/fs/nfs/nfs4_fs.h
4 *
5 * Copyright (C) 2005 Trond Myklebust
6 *
7 * NFSv4-specific filesystem definitions and declarations
8 */
9
10#ifndef __LINUX_FS_NFS_NFS4_FS_H
11#define __LINUX_FS_NFS_NFS4_FS_H
12
13#if defined(CONFIG_NFS_V4_2)
14#define NFS4_MAX_MINOR_VERSION 2
15#elif defined(CONFIG_NFS_V4_1)
16#define NFS4_MAX_MINOR_VERSION 1
17#else
18#define NFS4_MAX_MINOR_VERSION 0
19#endif
20
21#if IS_ENABLED(CONFIG_NFS_V4)
22
23#define NFS4_MAX_LOOP_ON_RECOVER (10)
24
25#include <linux/seqlock.h>
26
27struct idmap;
28
29enum nfs4_client_state {
30 NFS4CLNT_MANAGER_RUNNING = 0,
31 NFS4CLNT_CHECK_LEASE,
32 NFS4CLNT_LEASE_EXPIRED,
33 NFS4CLNT_RECLAIM_REBOOT,
34 NFS4CLNT_RECLAIM_NOGRACE,
35 NFS4CLNT_DELEGRETURN,
36 NFS4CLNT_SESSION_RESET,
37 NFS4CLNT_LEASE_CONFIRM,
38 NFS4CLNT_SERVER_SCOPE_MISMATCH,
39 NFS4CLNT_PURGE_STATE,
40 NFS4CLNT_BIND_CONN_TO_SESSION,
41 NFS4CLNT_MOVED,
42 NFS4CLNT_LEASE_MOVED,
43 NFS4CLNT_DELEGATION_EXPIRED,
44};
45
46#define NFS4_RENEW_TIMEOUT 0x01
47#define NFS4_RENEW_DELEGATION_CB 0x02
48
49struct nfs_seqid_counter;
50struct nfs4_minor_version_ops {
51 u32 minor_version;
52 unsigned init_caps;
53
54 int (*init_client)(struct nfs_client *);
55 void (*shutdown_client)(struct nfs_client *);
56 bool (*match_stateid)(const nfs4_stateid *,
57 const nfs4_stateid *);
58 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
59 struct nfs_fsinfo *);
60 void (*free_lock_state)(struct nfs_server *,
61 struct nfs4_lock_state *);
62 int (*test_and_free_expired)(struct nfs_server *,
63 nfs4_stateid *, struct rpc_cred *);
64 struct nfs_seqid *
65 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
66 int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
67 const struct rpc_call_ops *call_sync_ops;
68 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
69 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
70 const struct nfs4_state_maintenance_ops *state_renewal_ops;
71 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
72};
73
74#define NFS_SEQID_CONFIRMED 1
75struct nfs_seqid_counter {
76 ktime_t create_time;
77 int owner_id;
78 int flags;
79 u32 counter;
80 spinlock_t lock; /* Protects the list */
81 struct list_head list; /* Defines sequence of RPC calls */
82 struct rpc_wait_queue wait; /* RPC call delay queue */
83};
84
85struct nfs_seqid {
86 struct nfs_seqid_counter *sequence;
87 struct list_head list;
88 struct rpc_task *task;
89};
90
91static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
92{
93 if (seqid_mutating_err(-status))
94 seqid->flags |= NFS_SEQID_CONFIRMED;
95}
96
97/*
98 * NFS4 state_owners and lock_owners are simply labels for ordered
99 * sequences of RPC calls. Their sole purpose is to provide once-only
100 * semantics by allowing the server to identify replayed requests.
101 */
102struct nfs4_state_owner {
103 struct nfs_server *so_server;
104 struct list_head so_lru;
105 unsigned long so_expires;
106 struct rb_node so_server_node;
107
108 struct rpc_cred *so_cred; /* Associated cred */
109
110 spinlock_t so_lock;
111 atomic_t so_count;
112 unsigned long so_flags;
113 struct list_head so_states;
114 struct nfs_seqid_counter so_seqid;
115 seqcount_t so_reclaim_seqcount;
116 struct mutex so_delegreturn_mutex;
117};
118
119enum {
120 NFS_OWNER_RECLAIM_REBOOT,
121 NFS_OWNER_RECLAIM_NOGRACE
122};
123
124#define NFS_LOCK_NEW 0
125#define NFS_LOCK_RECLAIM 1
126#define NFS_LOCK_EXPIRED 2
127
128/*
129 * struct nfs4_state maintains the client-side state for a given
130 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
131 *
132 * OPEN:
133 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
134 * we need to know how many files are open for reading or writing on a
135 * given inode. This information too is stored here.
136 *
137 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
138 */
139
140struct nfs4_lock_state {
141 struct list_head ls_locks; /* Other lock stateids */
142 struct nfs4_state * ls_state; /* Pointer to open state */
143#define NFS_LOCK_INITIALIZED 0
144#define NFS_LOCK_LOST 1
145 unsigned long ls_flags;
146 struct nfs_seqid_counter ls_seqid;
147 nfs4_stateid ls_stateid;
148 refcount_t ls_count;
149 fl_owner_t ls_owner;
150};
151
152/* bits for nfs4_state->flags */
153enum {
154 LK_STATE_IN_USE,
155 NFS_DELEGATED_STATE, /* Current stateid is delegation */
156 NFS_OPEN_STATE, /* OPEN stateid is set */
157 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
158 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
159 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
160 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
161 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
162 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
163 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
164 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
165 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
166};
167
168struct nfs4_state {
169 struct list_head open_states; /* List of states for the same state_owner */
170 struct list_head inode_states; /* List of states for the same inode */
171 struct list_head lock_states; /* List of subservient lock stateids */
172
173 struct nfs4_state_owner *owner; /* Pointer to the open owner */
174 struct inode *inode; /* Pointer to the inode */
175
176 unsigned long flags; /* Do we hold any locks? */
177 spinlock_t state_lock; /* Protects the lock_states list */
178
179 seqlock_t seqlock; /* Protects the stateid/open_stateid */
180 nfs4_stateid stateid; /* Current stateid: may be delegation */
181 nfs4_stateid open_stateid; /* OPEN stateid */
182
183 /* The following 3 fields are protected by owner->so_lock */
184 unsigned int n_rdonly; /* Number of read-only references */
185 unsigned int n_wronly; /* Number of write-only references */
186 unsigned int n_rdwr; /* Number of read/write references */
187 fmode_t state; /* State on the server (R,W, or RW) */
188 atomic_t count;
189
190 wait_queue_head_t waitq;
191};
192
193
194struct nfs4_exception {
195 struct nfs4_state *state;
196 struct inode *inode;
197 nfs4_stateid *stateid;
198 long timeout;
199 unsigned char delay : 1,
200 recovering : 1,
201 retry : 1;
202};
203
204struct nfs4_state_recovery_ops {
205 int owner_flag_bit;
206 int state_flag_bit;
207 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
208 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
209 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
210 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
211 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
212 struct rpc_cred *);
213};
214
215struct nfs4_add_xprt_data {
216 struct nfs_client *clp;
217 struct rpc_cred *cred;
218};
219
220struct nfs4_state_maintenance_ops {
221 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
222 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
223 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
224};
225
226struct nfs4_mig_recovery_ops {
227 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
228 struct page *, struct rpc_cred *);
229 int (*fsid_present)(struct inode *, struct rpc_cred *);
230};
231
232extern const struct dentry_operations nfs4_dentry_operations;
233
234/* dir.c */
235int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
236 unsigned, umode_t, int *);
237
238/* super.c */
239extern struct file_system_type nfs4_fs_type;
240
241/* nfs4namespace.c */
242struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
243 const struct qstr *);
244struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
245 struct nfs_fh *, struct nfs_fattr *);
246int nfs4_replace_transport(struct nfs_server *server,
247 const struct nfs4_fs_locations *locations);
248
249/* nfs4proc.c */
250extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
251extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
252 struct rpc_message *, struct nfs4_sequence_args *,
253 struct nfs4_sequence_res *, int);
254extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int);
255extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
256extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
257extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
258extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
259extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
260extern int nfs4_destroy_clientid(struct nfs_client *clp);
261extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
262extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
263extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
264extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
265extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
266 struct nfs4_fs_locations *, struct page *);
267extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
268 struct page *page, struct rpc_cred *);
269extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
270extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
271 struct nfs_fh *, struct nfs_fattr *);
272extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
273extern const struct xattr_handler *nfs4_xattr_handlers[];
274extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
275 const struct nfs_open_context *ctx,
276 const struct nfs_lock_context *l_ctx,
277 fmode_t fmode);
278
279#if defined(CONFIG_NFS_V4_1)
280extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
281extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
282extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
283extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
284 struct nfs_fsinfo *fsinfo);
285extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
286 bool sync);
287extern int nfs4_detect_session_trunking(struct nfs_client *clp,
288 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
289
290static inline bool
291is_ds_only_client(struct nfs_client *clp)
292{
293 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
294 EXCHGID4_FLAG_USE_PNFS_DS;
295}
296
297static inline bool
298is_ds_client(struct nfs_client *clp)
299{
300 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
301}
302
303static inline bool
304_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
305 struct rpc_clnt **clntp, struct rpc_message *msg)
306{
307 struct rpc_cred *newcred = NULL;
308 rpc_authflavor_t flavor;
309
310 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
311 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
312 /* Using machine creds for cleanup operations
313 * is only relevent if the client credentials
314 * might expire. So don't bother for
315 * RPC_AUTH_UNIX. If file was only exported to
316 * sec=sys, the PUTFH would fail anyway.
317 */
318 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
319 return false;
320 }
321 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
322 spin_lock(&clp->cl_lock);
323 if (clp->cl_machine_cred != NULL)
324 /* don't call get_rpccred on the machine cred -
325 * a reference will be held for life of clp */
326 newcred = clp->cl_machine_cred;
327 spin_unlock(&clp->cl_lock);
328 msg->rpc_cred = newcred;
329
330 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
331 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
332 flavor != RPC_AUTH_GSS_KRB5P);
333 *clntp = clp->cl_rpcclient;
334
335 return true;
336 }
337 return false;
338}
339
340/*
341 * Function responsible for determining if an rpc_message should use the
342 * machine cred under SP4_MACH_CRED and if so switching the credential and
343 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
344 * Should be called before rpc_call_sync/rpc_call_async.
345 */
346static inline void
347nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
348 struct rpc_clnt **clntp, struct rpc_message *msg)
349{
350 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
351}
352
353/*
354 * Special wrapper to nfs4_state_protect for write.
355 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
356 * that use machine cred use NFS_FILE_SYNC.
357 */
358static inline void
359nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
360 struct rpc_message *msg, struct nfs_pgio_header *hdr)
361{
362 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
363 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
364 hdr->args.stable = NFS_FILE_SYNC;
365}
366#else /* CONFIG_NFS_v4_1 */
367static inline bool
368is_ds_only_client(struct nfs_client *clp)
369{
370 return false;
371}
372
373static inline bool
374is_ds_client(struct nfs_client *clp)
375{
376 return false;
377}
378
379static inline void
380nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
381 struct rpc_clnt **clntp, struct rpc_message *msg)
382{
383}
384
385static inline void
386nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
387 struct rpc_message *msg, struct nfs_pgio_header *hdr)
388{
389}
390#endif /* CONFIG_NFS_V4_1 */
391
392extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
393
394extern const u32 nfs4_fattr_bitmap[3];
395extern const u32 nfs4_statfs_bitmap[3];
396extern const u32 nfs4_pathconf_bitmap[3];
397extern const u32 nfs4_fsinfo_bitmap[3];
398extern const u32 nfs4_fs_locations_bitmap[3];
399
400void nfs40_shutdown_client(struct nfs_client *);
401void nfs41_shutdown_client(struct nfs_client *);
402int nfs40_init_client(struct nfs_client *);
403int nfs41_init_client(struct nfs_client *);
404void nfs4_free_client(struct nfs_client *);
405
406struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
407
408/* nfs4renewd.c */
409extern void nfs4_schedule_state_renewal(struct nfs_client *);
410extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
411extern void nfs4_kill_renewd(struct nfs_client *);
412extern void nfs4_renew_state(struct work_struct *);
413extern void nfs4_set_lease_period(struct nfs_client *clp,
414 unsigned long lease,
415 unsigned long lastrenewed);
416
417
418/* nfs4state.c */
419struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
420struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
421struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
422int nfs4_discover_server_trunking(struct nfs_client *clp,
423 struct nfs_client **);
424int nfs40_discover_server_trunking(struct nfs_client *clp,
425 struct nfs_client **, struct rpc_cred *);
426#if defined(CONFIG_NFS_V4_1)
427int nfs41_discover_server_trunking(struct nfs_client *clp,
428 struct nfs_client **, struct rpc_cred *);
429extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
430extern void nfs41_notify_server(struct nfs_client *);
431#else
432static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
433{
434}
435#endif /* CONFIG_NFS_V4_1 */
436
437extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
438extern void nfs4_put_state_owner(struct nfs4_state_owner *);
439extern void nfs4_purge_state_owners(struct nfs_server *);
440extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
441extern void nfs4_put_open_state(struct nfs4_state *);
442extern void nfs4_close_state(struct nfs4_state *, fmode_t);
443extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
444extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
445extern void nfs_inode_find_state_and_recover(struct inode *inode,
446 const nfs4_stateid *stateid);
447extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
448extern void nfs4_schedule_lease_recovery(struct nfs_client *);
449extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
450extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
451extern void nfs4_schedule_state_manager(struct nfs_client *);
452extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
453extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
454extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
455extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
456extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
457extern void nfs41_handle_server_scope(struct nfs_client *,
458 struct nfs41_server_scope **);
459extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
460extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
461extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
462 const struct nfs_lock_context *, nfs4_stateid *,
463 struct rpc_cred **);
464extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
465 struct nfs4_state *state);
466extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
467 struct nfs4_state *state);
468
469extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
470extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
471extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
472extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
473extern void nfs_release_seqid(struct nfs_seqid *seqid);
474extern void nfs_free_seqid(struct nfs_seqid *seqid);
475extern int nfs4_setup_sequence(struct nfs_client *client,
476 struct nfs4_sequence_args *args,
477 struct nfs4_sequence_res *res,
478 struct rpc_task *task);
479extern int nfs4_sequence_done(struct rpc_task *task,
480 struct nfs4_sequence_res *res);
481
482extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
483
484extern const nfs4_stateid zero_stateid;
485extern const nfs4_stateid invalid_stateid;
486
487/* nfs4super.c */
488struct nfs_mount_info;
489extern struct nfs_subversion nfs_v4;
490struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
491extern bool nfs4_disable_idmapping;
492extern unsigned short max_session_slots;
493extern unsigned short max_session_cb_slots;
494extern unsigned short send_implementation_id;
495extern bool recover_lost_locks;
496
497#define NFS4_CLIENT_ID_UNIQ_LEN (64)
498extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
499
500/* nfs4sysctl.c */
501#ifdef CONFIG_SYSCTL
502int nfs4_register_sysctl(void);
503void nfs4_unregister_sysctl(void);
504#else
505static inline int nfs4_register_sysctl(void)
506{
507 return 0;
508}
509
510static inline void nfs4_unregister_sysctl(void)
511{
512}
513#endif
514
515/* nfs4xdr.c */
516extern const struct rpc_procinfo nfs4_procedures[];
517
518struct nfs4_mount_data;
519
520/* callback_xdr.c */
521extern const struct svc_version nfs4_callback_version1;
522extern const struct svc_version nfs4_callback_version4;
523
524static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
525{
526 memcpy(dst->data, src->data, sizeof(dst->data));
527 dst->type = src->type;
528}
529
530static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
531{
532 if (dst->type != src->type)
533 return false;
534 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
535}
536
537static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
538{
539 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
540}
541
542static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
543{
544 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
545}
546
547static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
548{
549 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
550}
551
552static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
553 const nfs4_stateid *stateid)
554{
555 return test_bit(NFS_OPEN_STATE, &state->flags) &&
556 nfs4_stateid_match_other(&state->open_stateid, stateid);
557}
558
559#else
560
561#define nfs4_close_state(a, b) do { } while (0)
562#define nfs4_close_sync(a, b) do { } while (0)
563#define nfs4_state_protect(a, b, c, d) do { } while (0)
564#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
565
566#endif /* CONFIG_NFS_V4 */
567#endif /* __LINUX_FS_NFS_NFS4_FS.H */
1/*
2 * linux/fs/nfs/nfs4_fs.h
3 *
4 * Copyright (C) 2005 Trond Myklebust
5 *
6 * NFSv4-specific filesystem definitions and declarations
7 */
8
9#ifndef __LINUX_FS_NFS_NFS4_FS_H
10#define __LINUX_FS_NFS_NFS4_FS_H
11
12#if defined(CONFIG_NFS_V4_2)
13#define NFS4_MAX_MINOR_VERSION 2
14#elif defined(CONFIG_NFS_V4_1)
15#define NFS4_MAX_MINOR_VERSION 1
16#else
17#define NFS4_MAX_MINOR_VERSION 0
18#endif
19
20#if IS_ENABLED(CONFIG_NFS_V4)
21
22#define NFS4_MAX_LOOP_ON_RECOVER (10)
23
24#include <linux/seqlock.h>
25
26struct idmap;
27
28enum nfs4_client_state {
29 NFS4CLNT_MANAGER_RUNNING = 0,
30 NFS4CLNT_CHECK_LEASE,
31 NFS4CLNT_LEASE_EXPIRED,
32 NFS4CLNT_RECLAIM_REBOOT,
33 NFS4CLNT_RECLAIM_NOGRACE,
34 NFS4CLNT_DELEGRETURN,
35 NFS4CLNT_SESSION_RESET,
36 NFS4CLNT_LEASE_CONFIRM,
37 NFS4CLNT_SERVER_SCOPE_MISMATCH,
38 NFS4CLNT_PURGE_STATE,
39 NFS4CLNT_BIND_CONN_TO_SESSION,
40 NFS4CLNT_MOVED,
41 NFS4CLNT_LEASE_MOVED,
42};
43
44#define NFS4_RENEW_TIMEOUT 0x01
45#define NFS4_RENEW_DELEGATION_CB 0x02
46
47struct nfs_seqid_counter;
48struct nfs4_minor_version_ops {
49 u32 minor_version;
50 unsigned init_caps;
51
52 int (*init_client)(struct nfs_client *);
53 void (*shutdown_client)(struct nfs_client *);
54 bool (*match_stateid)(const nfs4_stateid *,
55 const nfs4_stateid *);
56 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
57 struct nfs_fsinfo *);
58 void (*free_lock_state)(struct nfs_server *,
59 struct nfs4_lock_state *);
60 struct nfs_seqid *
61 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
62 const struct rpc_call_ops *call_sync_ops;
63 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
64 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
65 const struct nfs4_state_maintenance_ops *state_renewal_ops;
66 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
67};
68
69#define NFS_SEQID_CONFIRMED 1
70struct nfs_seqid_counter {
71 ktime_t create_time;
72 int owner_id;
73 int flags;
74 u32 counter;
75 spinlock_t lock; /* Protects the list */
76 struct list_head list; /* Defines sequence of RPC calls */
77 struct rpc_wait_queue wait; /* RPC call delay queue */
78};
79
80struct nfs_seqid {
81 struct nfs_seqid_counter *sequence;
82 struct list_head list;
83 struct rpc_task *task;
84};
85
86static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
87{
88 if (seqid_mutating_err(-status))
89 seqid->flags |= NFS_SEQID_CONFIRMED;
90}
91
92/*
93 * NFS4 state_owners and lock_owners are simply labels for ordered
94 * sequences of RPC calls. Their sole purpose is to provide once-only
95 * semantics by allowing the server to identify replayed requests.
96 */
97struct nfs4_state_owner {
98 struct nfs_server *so_server;
99 struct list_head so_lru;
100 unsigned long so_expires;
101 struct rb_node so_server_node;
102
103 struct rpc_cred *so_cred; /* Associated cred */
104
105 spinlock_t so_lock;
106 atomic_t so_count;
107 unsigned long so_flags;
108 struct list_head so_states;
109 struct nfs_seqid_counter so_seqid;
110 seqcount_t so_reclaim_seqcount;
111 struct mutex so_delegreturn_mutex;
112};
113
114enum {
115 NFS_OWNER_RECLAIM_REBOOT,
116 NFS_OWNER_RECLAIM_NOGRACE
117};
118
119#define NFS_LOCK_NEW 0
120#define NFS_LOCK_RECLAIM 1
121#define NFS_LOCK_EXPIRED 2
122
123/*
124 * struct nfs4_state maintains the client-side state for a given
125 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
126 *
127 * OPEN:
128 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
129 * we need to know how many files are open for reading or writing on a
130 * given inode. This information too is stored here.
131 *
132 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
133 */
134
135struct nfs4_lock_state {
136 struct list_head ls_locks; /* Other lock stateids */
137 struct nfs4_state * ls_state; /* Pointer to open state */
138#define NFS_LOCK_INITIALIZED 0
139#define NFS_LOCK_LOST 1
140 unsigned long ls_flags;
141 struct nfs_seqid_counter ls_seqid;
142 nfs4_stateid ls_stateid;
143 atomic_t ls_count;
144 fl_owner_t ls_owner;
145};
146
147/* bits for nfs4_state->flags */
148enum {
149 LK_STATE_IN_USE,
150 NFS_DELEGATED_STATE, /* Current stateid is delegation */
151 NFS_OPEN_STATE, /* OPEN stateid is set */
152 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
153 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
154 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
155 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
156 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
157 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
158 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
159};
160
161struct nfs4_state {
162 struct list_head open_states; /* List of states for the same state_owner */
163 struct list_head inode_states; /* List of states for the same inode */
164 struct list_head lock_states; /* List of subservient lock stateids */
165
166 struct nfs4_state_owner *owner; /* Pointer to the open owner */
167 struct inode *inode; /* Pointer to the inode */
168
169 unsigned long flags; /* Do we hold any locks? */
170 spinlock_t state_lock; /* Protects the lock_states list */
171
172 seqlock_t seqlock; /* Protects the stateid/open_stateid */
173 nfs4_stateid stateid; /* Current stateid: may be delegation */
174 nfs4_stateid open_stateid; /* OPEN stateid */
175
176 /* The following 3 fields are protected by owner->so_lock */
177 unsigned int n_rdonly; /* Number of read-only references */
178 unsigned int n_wronly; /* Number of write-only references */
179 unsigned int n_rdwr; /* Number of read/write references */
180 fmode_t state; /* State on the server (R,W, or RW) */
181 atomic_t count;
182};
183
184
185struct nfs4_exception {
186 struct nfs4_state *state;
187 struct inode *inode;
188 long timeout;
189 unsigned char delay : 1,
190 recovering : 1,
191 retry : 1;
192};
193
194struct nfs4_state_recovery_ops {
195 int owner_flag_bit;
196 int state_flag_bit;
197 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
198 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
199 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
200 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
201 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
202 struct rpc_cred *);
203};
204
205struct nfs4_state_maintenance_ops {
206 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
207 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
208 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
209};
210
211struct nfs4_mig_recovery_ops {
212 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
213 struct page *, struct rpc_cred *);
214 int (*fsid_present)(struct inode *, struct rpc_cred *);
215};
216
217extern const struct dentry_operations nfs4_dentry_operations;
218
219/* dir.c */
220int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
221 unsigned, umode_t, int *);
222
223/* super.c */
224extern struct file_system_type nfs4_fs_type;
225
226/* nfs4namespace.c */
227struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, struct qstr *);
228struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
229 struct nfs_fh *, struct nfs_fattr *);
230int nfs4_replace_transport(struct nfs_server *server,
231 const struct nfs4_fs_locations *locations);
232
233/* nfs4proc.c */
234extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
235extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
236 struct rpc_message *, struct nfs4_sequence_args *,
237 struct nfs4_sequence_res *, int);
238extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int);
239extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
240extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
241extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
242extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
243extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
244extern int nfs4_destroy_clientid(struct nfs_client *clp);
245extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
246extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
247extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
248extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
249extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
250 struct nfs4_fs_locations *, struct page *);
251extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
252 struct page *page, struct rpc_cred *);
253extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
254extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
255 struct nfs_fh *, struct nfs_fattr *);
256extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
257extern const struct xattr_handler *nfs4_xattr_handlers[];
258extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
259 const struct nfs_open_context *ctx,
260 const struct nfs_lock_context *l_ctx,
261 fmode_t fmode);
262
263#if defined(CONFIG_NFS_V4_1)
264static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
265{
266 return server->nfs_client->cl_session;
267}
268
269extern int nfs41_setup_sequence(struct nfs4_session *session,
270 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
271 struct rpc_task *task);
272extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
273extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
274extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
275extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
276 struct nfs_fsinfo *fsinfo);
277extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
278 bool sync);
279
280static inline bool
281is_ds_only_client(struct nfs_client *clp)
282{
283 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
284 EXCHGID4_FLAG_USE_PNFS_DS;
285}
286
287static inline bool
288is_ds_client(struct nfs_client *clp)
289{
290 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
291}
292
293static inline bool
294_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
295 struct rpc_clnt **clntp, struct rpc_message *msg)
296{
297 struct rpc_cred *newcred = NULL;
298 rpc_authflavor_t flavor;
299
300 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
301 spin_lock(&clp->cl_lock);
302 if (clp->cl_machine_cred != NULL)
303 /* don't call get_rpccred on the machine cred -
304 * a reference will be held for life of clp */
305 newcred = clp->cl_machine_cred;
306 spin_unlock(&clp->cl_lock);
307 msg->rpc_cred = newcred;
308
309 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
310 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
311 flavor != RPC_AUTH_GSS_KRB5P);
312 *clntp = clp->cl_rpcclient;
313
314 return true;
315 }
316 return false;
317}
318
319/*
320 * Function responsible for determining if an rpc_message should use the
321 * machine cred under SP4_MACH_CRED and if so switching the credential and
322 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
323 * Should be called before rpc_call_sync/rpc_call_async.
324 */
325static inline void
326nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
327 struct rpc_clnt **clntp, struct rpc_message *msg)
328{
329 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
330}
331
332/*
333 * Special wrapper to nfs4_state_protect for write.
334 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
335 * that use machine cred use NFS_FILE_SYNC.
336 */
337static inline void
338nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
339 struct rpc_message *msg, struct nfs_pgio_header *hdr)
340{
341 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
342 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
343 hdr->args.stable = NFS_FILE_SYNC;
344}
345#else /* CONFIG_NFS_v4_1 */
346static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
347{
348 return NULL;
349}
350
351static inline bool
352is_ds_only_client(struct nfs_client *clp)
353{
354 return false;
355}
356
357static inline bool
358is_ds_client(struct nfs_client *clp)
359{
360 return false;
361}
362
363static inline void
364nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
365 struct rpc_clnt **clntp, struct rpc_message *msg)
366{
367}
368
369static inline void
370nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
371 struct rpc_message *msg, struct nfs_pgio_header *hdr)
372{
373}
374#endif /* CONFIG_NFS_V4_1 */
375
376extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
377
378extern const u32 nfs4_fattr_bitmap[3];
379extern const u32 nfs4_statfs_bitmap[3];
380extern const u32 nfs4_pathconf_bitmap[3];
381extern const u32 nfs4_fsinfo_bitmap[3];
382extern const u32 nfs4_fs_locations_bitmap[3];
383
384void nfs40_shutdown_client(struct nfs_client *);
385void nfs41_shutdown_client(struct nfs_client *);
386int nfs40_init_client(struct nfs_client *);
387int nfs41_init_client(struct nfs_client *);
388void nfs4_free_client(struct nfs_client *);
389
390struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
391
392/* nfs4renewd.c */
393extern void nfs4_schedule_state_renewal(struct nfs_client *);
394extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
395extern void nfs4_kill_renewd(struct nfs_client *);
396extern void nfs4_renew_state(struct work_struct *);
397
398/* nfs4state.c */
399struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
400struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
401struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
402int nfs4_discover_server_trunking(struct nfs_client *clp,
403 struct nfs_client **);
404int nfs40_discover_server_trunking(struct nfs_client *clp,
405 struct nfs_client **, struct rpc_cred *);
406#if defined(CONFIG_NFS_V4_1)
407int nfs41_discover_server_trunking(struct nfs_client *clp,
408 struct nfs_client **, struct rpc_cred *);
409extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
410extern void nfs41_notify_server(struct nfs_client *);
411#else
412static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
413{
414}
415#endif /* CONFIG_NFS_V4_1 */
416
417extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
418extern void nfs4_put_state_owner(struct nfs4_state_owner *);
419extern void nfs4_purge_state_owners(struct nfs_server *);
420extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
421extern void nfs4_put_open_state(struct nfs4_state *);
422extern void nfs4_close_state(struct nfs4_state *, fmode_t);
423extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
424extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
425extern void nfs_inode_find_state_and_recover(struct inode *inode,
426 const nfs4_stateid *stateid);
427extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
428extern void nfs4_schedule_lease_recovery(struct nfs_client *);
429extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
430extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
431extern void nfs4_schedule_state_manager(struct nfs_client *);
432extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
433extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
434extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
435extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
436extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
437extern void nfs41_handle_server_scope(struct nfs_client *,
438 struct nfs41_server_scope **);
439extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
440extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
441extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
442 fmode_t, const struct nfs_lockowner *);
443
444extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
445extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
446extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
447extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
448extern void nfs_release_seqid(struct nfs_seqid *seqid);
449extern void nfs_free_seqid(struct nfs_seqid *seqid);
450extern int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
451 struct nfs4_sequence_args *args,
452 struct nfs4_sequence_res *res,
453 struct rpc_task *task);
454extern int nfs4_sequence_done(struct rpc_task *task,
455 struct nfs4_sequence_res *res);
456
457extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
458
459extern const nfs4_stateid zero_stateid;
460
461/* nfs4super.c */
462struct nfs_mount_info;
463extern struct nfs_subversion nfs_v4;
464struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
465extern bool nfs4_disable_idmapping;
466extern unsigned short max_session_slots;
467extern unsigned short send_implementation_id;
468extern bool recover_lost_locks;
469
470#define NFS4_CLIENT_ID_UNIQ_LEN (64)
471extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
472
473/* nfs4sysctl.c */
474#ifdef CONFIG_SYSCTL
475int nfs4_register_sysctl(void);
476void nfs4_unregister_sysctl(void);
477#else
478static inline int nfs4_register_sysctl(void)
479{
480 return 0;
481}
482
483static inline void nfs4_unregister_sysctl(void)
484{
485}
486#endif
487
488/* nfs4xdr.c */
489extern struct rpc_procinfo nfs4_procedures[];
490
491struct nfs4_mount_data;
492
493/* callback_xdr.c */
494extern struct svc_version nfs4_callback_version1;
495extern struct svc_version nfs4_callback_version4;
496
497static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
498{
499 memcpy(dst, src, sizeof(*dst));
500}
501
502static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
503{
504 return memcmp(dst, src, sizeof(*dst)) == 0;
505}
506
507static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
508{
509 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
510}
511
512static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
513{
514 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
515}
516
517static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
518{
519 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
520}
521
522#else
523
524#define nfs4_close_state(a, b) do { } while (0)
525#define nfs4_close_sync(a, b) do { } while (0)
526#define nfs4_state_protect(a, b, c, d) do { } while (0)
527#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
528
529#endif /* CONFIG_NFS_V4 */
530#endif /* __LINUX_FS_NFS_NFS4_FS.H */