1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/fs/nfs/nfs4_fs.h
5 * Copyright (C) 2005 Trond Myklebust
7 * NFSv4-specific filesystem definitions and declarations
10 #ifndef __LINUX_FS_NFS_NFS4_FS_H
11 #define __LINUX_FS_NFS_NFS4_FS_H
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
18 #define NFS4_MAX_MINOR_VERSION 0
21 #if IS_ENABLED(CONFIG_NFS_V4)
23 #define NFS4_MAX_LOOP_ON_RECOVER (10)
25 #include <linux/seqlock.h>
29 enum nfs4_client_state {
30 NFS4CLNT_MANAGER_RUNNING = 0,
32 NFS4CLNT_LEASE_EXPIRED,
33 NFS4CLNT_RECLAIM_REBOOT,
34 NFS4CLNT_RECLAIM_NOGRACE,
36 NFS4CLNT_SESSION_RESET,
37 NFS4CLNT_LEASE_CONFIRM,
38 NFS4CLNT_SERVER_SCOPE_MISMATCH,
40 NFS4CLNT_BIND_CONN_TO_SESSION,
43 NFS4CLNT_DELEGATION_EXPIRED,
45 NFS4CLNT_DELEGRETURN_RUNNING,
48 #define NFS4_RENEW_TIMEOUT 0x01
49 #define NFS4_RENEW_DELEGATION_CB 0x02
51 struct nfs_seqid_counter;
52 struct nfs4_minor_version_ops {
56 int (*init_client)(struct nfs_client *);
57 void (*shutdown_client)(struct nfs_client *);
58 bool (*match_stateid)(const nfs4_stateid *,
59 const nfs4_stateid *);
60 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
62 void (*free_lock_state)(struct nfs_server *,
63 struct nfs4_lock_state *);
64 int (*test_and_free_expired)(struct nfs_server *,
65 nfs4_stateid *, const struct cred *);
67 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
68 void (*session_trunk)(struct rpc_clnt *clnt,
69 struct rpc_xprt *xprt, void *data);
70 const struct rpc_call_ops *call_sync_ops;
71 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
72 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
73 const struct nfs4_state_maintenance_ops *state_renewal_ops;
74 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
77 #define NFS_SEQID_CONFIRMED 1
78 struct nfs_seqid_counter {
83 spinlock_t lock; /* Protects the list */
84 struct list_head list; /* Defines sequence of RPC calls */
85 struct rpc_wait_queue wait; /* RPC call delay queue */
89 struct nfs_seqid_counter *sequence;
90 struct list_head list;
91 struct rpc_task *task;
94 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
96 if (seqid_mutating_err(-status))
97 seqid->flags |= NFS_SEQID_CONFIRMED;
101 * NFS4 state_owners and lock_owners are simply labels for ordered
102 * sequences of RPC calls. Their sole purpose is to provide once-only
103 * semantics by allowing the server to identify replayed requests.
105 struct nfs4_state_owner {
106 struct nfs_server *so_server;
107 struct list_head so_lru;
108 unsigned long so_expires;
109 struct rb_node so_server_node;
111 const struct cred *so_cred; /* Associated cred */
115 unsigned long so_flags;
116 struct list_head so_states;
117 struct nfs_seqid_counter so_seqid;
118 seqcount_t so_reclaim_seqcount;
119 struct mutex so_delegreturn_mutex;
123 NFS_OWNER_RECLAIM_REBOOT,
124 NFS_OWNER_RECLAIM_NOGRACE
127 #define NFS_LOCK_NEW 0
128 #define NFS_LOCK_RECLAIM 1
129 #define NFS_LOCK_EXPIRED 2
132 * struct nfs4_state maintains the client-side state for a given
133 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
136 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
137 * we need to know how many files are open for reading or writing on a
138 * given inode. This information too is stored here.
140 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
143 struct nfs4_lock_state {
144 struct list_head ls_locks; /* Other lock stateids */
145 struct nfs4_state * ls_state; /* Pointer to open state */
146 #define NFS_LOCK_INITIALIZED 0
147 #define NFS_LOCK_LOST 1
148 unsigned long ls_flags;
149 struct nfs_seqid_counter ls_seqid;
150 nfs4_stateid ls_stateid;
155 /* bits for nfs4_state->flags */
158 NFS_DELEGATED_STATE, /* Current stateid is delegation */
159 NFS_OPEN_STATE, /* OPEN stateid is set */
160 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
161 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
162 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
163 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
164 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
165 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
166 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
167 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
168 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
169 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
170 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/
171 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */
175 struct list_head open_states; /* List of states for the same state_owner */
176 struct list_head inode_states; /* List of states for the same inode */
177 struct list_head lock_states; /* List of subservient lock stateids */
179 struct nfs4_state_owner *owner; /* Pointer to the open owner */
180 struct inode *inode; /* Pointer to the inode */
182 unsigned long flags; /* Do we hold any locks? */
183 spinlock_t state_lock; /* Protects the lock_states list */
185 seqlock_t seqlock; /* Protects the stateid/open_stateid */
186 nfs4_stateid stateid; /* Current stateid: may be delegation */
187 nfs4_stateid open_stateid; /* OPEN stateid */
189 /* The following 3 fields are protected by owner->so_lock */
190 unsigned int n_rdonly; /* Number of read-only references */
191 unsigned int n_wronly; /* Number of write-only references */
192 unsigned int n_rdwr; /* Number of read/write references */
193 fmode_t state; /* State on the server (R,W, or RW) */
196 wait_queue_head_t waitq;
197 struct rcu_head rcu_head;
201 struct nfs4_exception {
202 struct nfs4_state *state;
204 nfs4_stateid *stateid;
206 unsigned char delay : 1,
212 struct nfs4_state_recovery_ops {
215 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
216 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
217 int (*establish_clid)(struct nfs_client *, const struct cred *);
218 int (*reclaim_complete)(struct nfs_client *, const struct cred *);
219 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
220 const struct cred *);
223 struct nfs4_opendata {
225 struct nfs_openargs o_arg;
226 struct nfs_openres o_res;
227 struct nfs_open_confirmargs c_arg;
228 struct nfs_open_confirmres c_res;
229 struct nfs4_string owner_name;
230 struct nfs4_string group_name;
231 struct nfs4_label *a_label;
232 struct nfs_fattr f_attr;
233 struct nfs4_label *f_label;
235 struct dentry *dentry;
236 struct nfs4_state_owner *owner;
237 struct nfs4_state *state;
239 struct nfs4_layoutget *lgp;
240 unsigned long timestamp;
248 struct nfs4_add_xprt_data {
249 struct nfs_client *clp;
250 const struct cred *cred;
253 struct nfs4_state_maintenance_ops {
254 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
255 const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
256 int (*renew_lease)(struct nfs_client *, const struct cred *);
259 struct nfs4_mig_recovery_ops {
260 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
261 struct page *, const struct cred *);
262 int (*fsid_present)(struct inode *, const struct cred *);
265 extern const struct dentry_operations nfs4_dentry_operations;
268 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
272 extern struct file_system_type nfs4_fs_type;
274 /* nfs4namespace.c */
275 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
276 const struct qstr *);
277 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
278 struct nfs_fh *, struct nfs_fattr *);
279 int nfs4_replace_transport(struct nfs_server *server,
280 const struct nfs4_fs_locations *locations);
283 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
284 extern int nfs4_async_handle_error(struct rpc_task *task,
285 struct nfs_server *server,
286 struct nfs4_state *state, long *timeout);
287 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
288 struct rpc_message *, struct nfs4_sequence_args *,
289 struct nfs4_sequence_res *, int);
290 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
291 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
292 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
293 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
294 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
295 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
296 extern int nfs4_destroy_clientid(struct nfs_client *clp);
297 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
298 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
299 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
300 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
301 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
302 struct nfs4_fs_locations *, struct page *);
303 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
304 struct page *page, const struct cred *);
305 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
306 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
307 struct nfs_fh *, struct nfs_fattr *);
308 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
309 extern const struct xattr_handler *nfs4_xattr_handlers[];
310 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
311 const struct nfs_open_context *ctx,
312 const struct nfs_lock_context *l_ctx,
314 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
315 struct nfs_fattr *fattr, struct nfs4_label *label,
316 struct inode *inode);
317 extern int update_open_stateid(struct nfs4_state *state,
318 const nfs4_stateid *open_stateid,
319 const nfs4_stateid *deleg_stateid,
322 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
323 struct nfs_fsinfo *fsinfo);
324 #if defined(CONFIG_NFS_V4_1)
325 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
326 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
327 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
328 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
330 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
331 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
334 is_ds_only_client(struct nfs_client *clp)
336 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
337 EXCHGID4_FLAG_USE_PNFS_DS;
341 is_ds_client(struct nfs_client *clp)
343 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
347 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
348 struct rpc_clnt **clntp, struct rpc_message *msg)
350 rpc_authflavor_t flavor;
352 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
353 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
354 /* Using machine creds for cleanup operations
355 * is only relevent if the client credentials
356 * might expire. So don't bother for
357 * RPC_AUTH_UNIX. If file was only exported to
358 * sec=sys, the PUTFH would fail anyway.
360 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
363 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
364 msg->rpc_cred = rpc_machine_cred();
366 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
367 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
368 flavor != RPC_AUTH_GSS_KRB5P);
369 *clntp = clp->cl_rpcclient;
377 * Function responsible for determining if an rpc_message should use the
378 * machine cred under SP4_MACH_CRED and if so switching the credential and
379 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
380 * Should be called before rpc_call_sync/rpc_call_async.
383 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
384 struct rpc_clnt **clntp, struct rpc_message *msg)
386 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
390 * Special wrapper to nfs4_state_protect for write.
391 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
392 * that use machine cred use NFS_FILE_SYNC.
395 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
396 struct rpc_message *msg, struct nfs_pgio_header *hdr)
398 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
399 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
400 hdr->args.stable = NFS_FILE_SYNC;
402 #else /* CONFIG_NFS_v4_1 */
404 is_ds_only_client(struct nfs_client *clp)
410 is_ds_client(struct nfs_client *clp)
416 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
417 struct rpc_clnt **clntp, struct rpc_message *msg)
422 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
423 struct rpc_message *msg, struct nfs_pgio_header *hdr)
426 #endif /* CONFIG_NFS_V4_1 */
428 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
430 extern const u32 nfs4_fattr_bitmap[3];
431 extern const u32 nfs4_statfs_bitmap[3];
432 extern const u32 nfs4_pathconf_bitmap[3];
433 extern const u32 nfs4_fsinfo_bitmap[3];
434 extern const u32 nfs4_fs_locations_bitmap[3];
436 void nfs40_shutdown_client(struct nfs_client *);
437 void nfs41_shutdown_client(struct nfs_client *);
438 int nfs40_init_client(struct nfs_client *);
439 int nfs41_init_client(struct nfs_client *);
440 void nfs4_free_client(struct nfs_client *);
442 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
445 extern void nfs4_schedule_state_renewal(struct nfs_client *);
446 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
447 extern void nfs4_kill_renewd(struct nfs_client *);
448 extern void nfs4_renew_state(struct work_struct *);
449 extern void nfs4_set_lease_period(struct nfs_client *clp,
451 unsigned long lastrenewed);
455 extern const nfs4_stateid current_stateid;
457 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
458 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
459 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
460 int nfs4_discover_server_trunking(struct nfs_client *clp,
461 struct nfs_client **);
462 int nfs40_discover_server_trunking(struct nfs_client *clp,
463 struct nfs_client **, const struct cred *);
464 #if defined(CONFIG_NFS_V4_1)
465 int nfs41_discover_server_trunking(struct nfs_client *clp,
466 struct nfs_client **, const struct cred *);
467 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
468 extern void nfs41_notify_server(struct nfs_client *);
469 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
470 struct nfs41_server_owner *o2);
472 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
475 #endif /* CONFIG_NFS_V4_1 */
477 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
478 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
479 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
480 extern void nfs4_free_state_owners(struct list_head *head);
481 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
482 extern void nfs4_put_open_state(struct nfs4_state *);
483 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
484 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
485 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
486 extern void nfs_inode_find_state_and_recover(struct inode *inode,
487 const nfs4_stateid *stateid);
488 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
489 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
490 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
491 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
492 extern void nfs4_schedule_state_manager(struct nfs_client *);
493 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
494 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
495 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
496 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
497 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
498 extern void nfs41_handle_server_scope(struct nfs_client *,
499 struct nfs41_server_scope **);
500 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
501 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
502 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
503 const struct nfs_lock_context *, nfs4_stateid *,
504 const struct cred **);
505 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
506 struct nfs4_state *state);
508 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
509 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
510 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
511 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
512 extern void nfs_release_seqid(struct nfs_seqid *seqid);
513 extern void nfs_free_seqid(struct nfs_seqid *seqid);
514 extern int nfs4_setup_sequence(struct nfs_client *client,
515 struct nfs4_sequence_args *args,
516 struct nfs4_sequence_res *res,
517 struct rpc_task *task);
518 extern int nfs4_sequence_done(struct rpc_task *task,
519 struct nfs4_sequence_res *res);
521 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
522 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
523 extern const nfs4_stateid zero_stateid;
524 extern const nfs4_stateid invalid_stateid;
527 struct nfs_mount_info;
528 extern struct nfs_subversion nfs_v4;
529 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
530 extern bool nfs4_disable_idmapping;
531 extern unsigned short max_session_slots;
532 extern unsigned short max_session_cb_slots;
533 extern unsigned short send_implementation_id;
534 extern bool recover_lost_locks;
536 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
537 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
541 int nfs4_register_sysctl(void);
542 void nfs4_unregister_sysctl(void);
544 static inline int nfs4_register_sysctl(void)
549 static inline void nfs4_unregister_sysctl(void)
555 extern const struct rpc_procinfo nfs4_procedures[];
557 struct nfs4_mount_data;
560 extern const struct svc_version nfs4_callback_version1;
561 extern const struct svc_version nfs4_callback_version4;
563 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
565 memcpy(dst->data, src->data, sizeof(dst->data));
566 dst->type = src->type;
569 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
571 if (dst->type != src->type)
573 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
576 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
578 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
581 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
583 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
586 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
588 return nfs4_stateid_match_other(dst, src) &&
589 !(src->seqid && nfs4_stateid_is_newer(dst, src));
592 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
594 u32 seqid = be32_to_cpu(s1->seqid);
598 s1->seqid = cpu_to_be32(seqid);
601 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
603 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
606 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
607 const nfs4_stateid *stateid)
609 return test_bit(NFS_OPEN_STATE, &state->flags) &&
610 nfs4_stateid_match_other(&state->open_stateid, stateid);
615 #define nfs4_close_state(a, b) do { } while (0)
616 #define nfs4_close_sync(a, b) do { } while (0)
617 #define nfs4_state_protect(a, b, c, d) do { } while (0)
618 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
620 #endif /* CONFIG_NFS_V4 */
621 #endif /* __LINUX_FS_NFS_NFS4_FS.H */