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 *, struct rpc_cred *);
67 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
68 int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
69 const struct rpc_call_ops *call_sync_ops;
70 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
71 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
72 const struct nfs4_state_maintenance_ops *state_renewal_ops;
73 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
76 #define NFS_SEQID_CONFIRMED 1
77 struct nfs_seqid_counter {
82 spinlock_t lock; /* Protects the list */
83 struct list_head list; /* Defines sequence of RPC calls */
84 struct rpc_wait_queue wait; /* RPC call delay queue */
88 struct nfs_seqid_counter *sequence;
89 struct list_head list;
90 struct rpc_task *task;
93 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
95 if (seqid_mutating_err(-status))
96 seqid->flags |= NFS_SEQID_CONFIRMED;
100 * NFS4 state_owners and lock_owners are simply labels for ordered
101 * sequences of RPC calls. Their sole purpose is to provide once-only
102 * semantics by allowing the server to identify replayed requests.
104 struct nfs4_state_owner {
105 struct nfs_server *so_server;
106 struct list_head so_lru;
107 unsigned long so_expires;
108 struct rb_node so_server_node;
110 struct rpc_cred *so_cred; /* Associated cred */
114 unsigned long so_flags;
115 struct list_head so_states;
116 struct nfs_seqid_counter so_seqid;
117 seqcount_t so_reclaim_seqcount;
118 struct mutex so_delegreturn_mutex;
122 NFS_OWNER_RECLAIM_REBOOT,
123 NFS_OWNER_RECLAIM_NOGRACE
126 #define NFS_LOCK_NEW 0
127 #define NFS_LOCK_RECLAIM 1
128 #define NFS_LOCK_EXPIRED 2
131 * struct nfs4_state maintains the client-side state for a given
132 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
135 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
136 * we need to know how many files are open for reading or writing on a
137 * given inode. This information too is stored here.
139 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
142 struct nfs4_lock_state {
143 struct list_head ls_locks; /* Other lock stateids */
144 struct nfs4_state * ls_state; /* Pointer to open state */
145 #define NFS_LOCK_INITIALIZED 0
146 #define NFS_LOCK_LOST 1
147 unsigned long ls_flags;
148 struct nfs_seqid_counter ls_seqid;
149 nfs4_stateid ls_stateid;
154 /* bits for nfs4_state->flags */
157 NFS_DELEGATED_STATE, /* Current stateid is delegation */
158 NFS_OPEN_STATE, /* OPEN stateid is set */
159 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
160 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
161 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
162 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
163 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
164 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
165 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
166 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
167 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
168 #ifdef CONFIG_NFS_V4_2
169 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
170 #endif /* CONFIG_NFS_V4_2 */
174 struct list_head open_states; /* List of states for the same state_owner */
175 struct list_head inode_states; /* List of states for the same inode */
176 struct list_head lock_states; /* List of subservient lock stateids */
178 struct nfs4_state_owner *owner; /* Pointer to the open owner */
179 struct inode *inode; /* Pointer to the inode */
181 unsigned long flags; /* Do we hold any locks? */
182 spinlock_t state_lock; /* Protects the lock_states list */
184 seqlock_t seqlock; /* Protects the stateid/open_stateid */
185 nfs4_stateid stateid; /* Current stateid: may be delegation */
186 nfs4_stateid open_stateid; /* OPEN stateid */
188 /* The following 3 fields are protected by owner->so_lock */
189 unsigned int n_rdonly; /* Number of read-only references */
190 unsigned int n_wronly; /* Number of write-only references */
191 unsigned int n_rdwr; /* Number of read/write references */
192 fmode_t state; /* State on the server (R,W, or RW) */
195 wait_queue_head_t waitq;
199 struct nfs4_exception {
200 struct nfs4_state *state;
202 nfs4_stateid *stateid;
204 unsigned char task_is_privileged : 1;
205 unsigned char delay : 1,
210 struct nfs4_state_recovery_ops {
213 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
214 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
215 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
216 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
217 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
221 struct nfs4_opendata {
223 struct nfs_openargs o_arg;
224 struct nfs_openres o_res;
225 struct nfs_open_confirmargs c_arg;
226 struct nfs_open_confirmres c_res;
227 struct nfs4_string owner_name;
228 struct nfs4_string group_name;
229 struct nfs4_label *a_label;
230 struct nfs_fattr f_attr;
231 struct nfs4_label *f_label;
233 struct dentry *dentry;
234 struct nfs4_state_owner *owner;
235 struct nfs4_state *state;
237 struct nfs4_layoutget *lgp;
238 unsigned long timestamp;
246 struct nfs4_add_xprt_data {
247 struct nfs_client *clp;
248 struct rpc_cred *cred;
251 struct nfs4_state_maintenance_ops {
252 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
253 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
254 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
257 struct nfs4_mig_recovery_ops {
258 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
259 struct page *, struct rpc_cred *);
260 int (*fsid_present)(struct inode *, struct rpc_cred *);
263 extern const struct dentry_operations nfs4_dentry_operations;
266 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
270 extern struct file_system_type nfs4_fs_type;
272 /* nfs4namespace.c */
273 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
274 const struct qstr *);
275 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
276 struct nfs_fh *, struct nfs_fattr *);
277 int nfs4_replace_transport(struct nfs_server *server,
278 const struct nfs4_fs_locations *locations);
281 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
282 extern int nfs4_async_handle_error(struct rpc_task *task,
283 struct nfs_server *server,
284 struct nfs4_state *state, long *timeout);
285 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
286 struct rpc_message *, struct nfs4_sequence_args *,
287 struct nfs4_sequence_res *, int);
288 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
289 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
290 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
291 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
292 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
293 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
294 extern int nfs4_destroy_clientid(struct nfs_client *clp);
295 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
296 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
297 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
298 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
299 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
300 struct nfs4_fs_locations *, struct page *);
301 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
302 struct page *page, struct rpc_cred *);
303 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
304 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
305 struct nfs_fh *, struct nfs_fattr *);
306 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
307 extern const struct xattr_handler *nfs4_xattr_handlers[];
308 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
309 const struct nfs_open_context *ctx,
310 const struct nfs_lock_context *l_ctx,
313 #if defined(CONFIG_NFS_V4_1)
314 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
315 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
316 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
317 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
318 struct nfs_fsinfo *fsinfo);
319 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
321 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
322 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
325 is_ds_only_client(struct nfs_client *clp)
327 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
328 EXCHGID4_FLAG_USE_PNFS_DS;
332 is_ds_client(struct nfs_client *clp)
334 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
338 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
339 struct rpc_clnt **clntp, struct rpc_message *msg)
341 struct rpc_cred *newcred = NULL;
342 rpc_authflavor_t flavor;
344 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
345 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
346 /* Using machine creds for cleanup operations
347 * is only relevent if the client credentials
348 * might expire. So don't bother for
349 * RPC_AUTH_UNIX. If file was only exported to
350 * sec=sys, the PUTFH would fail anyway.
352 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
355 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
356 spin_lock(&clp->cl_lock);
357 if (clp->cl_machine_cred != NULL)
358 /* don't call get_rpccred on the machine cred -
359 * a reference will be held for life of clp */
360 newcred = clp->cl_machine_cred;
361 spin_unlock(&clp->cl_lock);
362 msg->rpc_cred = newcred;
364 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
365 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
366 flavor != RPC_AUTH_GSS_KRB5P);
367 *clntp = clp->cl_rpcclient;
375 * Function responsible for determining if an rpc_message should use the
376 * machine cred under SP4_MACH_CRED and if so switching the credential and
377 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
378 * Should be called before rpc_call_sync/rpc_call_async.
381 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
382 struct rpc_clnt **clntp, struct rpc_message *msg)
384 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
388 * Special wrapper to nfs4_state_protect for write.
389 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
390 * that use machine cred use NFS_FILE_SYNC.
393 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
394 struct rpc_message *msg, struct nfs_pgio_header *hdr)
396 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
397 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
398 hdr->args.stable = NFS_FILE_SYNC;
400 #else /* CONFIG_NFS_v4_1 */
402 is_ds_only_client(struct nfs_client *clp)
408 is_ds_client(struct nfs_client *clp)
414 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
415 struct rpc_clnt **clntp, struct rpc_message *msg)
420 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
421 struct rpc_message *msg, struct nfs_pgio_header *hdr)
424 #endif /* CONFIG_NFS_V4_1 */
426 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
428 extern const u32 nfs4_fattr_bitmap[3];
429 extern const u32 nfs4_statfs_bitmap[3];
430 extern const u32 nfs4_pathconf_bitmap[3];
431 extern const u32 nfs4_fsinfo_bitmap[3];
432 extern const u32 nfs4_fs_locations_bitmap[3];
434 void nfs40_shutdown_client(struct nfs_client *);
435 void nfs41_shutdown_client(struct nfs_client *);
436 int nfs40_init_client(struct nfs_client *);
437 int nfs41_init_client(struct nfs_client *);
438 void nfs4_free_client(struct nfs_client *);
440 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
443 extern void nfs4_schedule_state_renewal(struct nfs_client *);
444 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
445 extern void nfs4_kill_renewd(struct nfs_client *);
446 extern void nfs4_renew_state(struct work_struct *);
447 extern void nfs4_set_lease_period(struct nfs_client *clp,
449 unsigned long lastrenewed);
453 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
454 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
455 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
456 int nfs4_discover_server_trunking(struct nfs_client *clp,
457 struct nfs_client **);
458 int nfs40_discover_server_trunking(struct nfs_client *clp,
459 struct nfs_client **, struct rpc_cred *);
460 #if defined(CONFIG_NFS_V4_1)
461 int nfs41_discover_server_trunking(struct nfs_client *clp,
462 struct nfs_client **, struct rpc_cred *);
463 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
464 extern void nfs41_notify_server(struct nfs_client *);
466 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
469 #endif /* CONFIG_NFS_V4_1 */
471 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
472 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
473 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
474 extern void nfs4_free_state_owners(struct list_head *head);
475 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
476 extern void nfs4_put_open_state(struct nfs4_state *);
477 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
478 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
479 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
480 extern void nfs_inode_find_state_and_recover(struct inode *inode,
481 const nfs4_stateid *stateid);
482 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
483 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
484 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
485 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
486 extern void nfs4_schedule_state_manager(struct nfs_client *);
487 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
488 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
489 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
490 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
491 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
492 extern void nfs41_handle_server_scope(struct nfs_client *,
493 struct nfs41_server_scope **);
494 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
495 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
496 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
497 const struct nfs_lock_context *, nfs4_stateid *,
499 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
500 struct nfs4_state *state);
501 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
502 struct nfs4_state *state);
504 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
505 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
506 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
507 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
508 extern void nfs_release_seqid(struct nfs_seqid *seqid);
509 extern void nfs_free_seqid(struct nfs_seqid *seqid);
510 extern int nfs4_setup_sequence(struct nfs_client *client,
511 struct nfs4_sequence_args *args,
512 struct nfs4_sequence_res *res,
513 struct rpc_task *task);
514 extern int nfs4_sequence_done(struct rpc_task *task,
515 struct nfs4_sequence_res *res);
517 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
518 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
519 extern const nfs4_stateid zero_stateid;
520 extern const nfs4_stateid invalid_stateid;
523 struct nfs_mount_info;
524 extern struct nfs_subversion nfs_v4;
525 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
526 extern bool nfs4_disable_idmapping;
527 extern unsigned short max_session_slots;
528 extern unsigned short max_session_cb_slots;
529 extern unsigned short send_implementation_id;
530 extern bool recover_lost_locks;
532 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
533 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
537 int nfs4_register_sysctl(void);
538 void nfs4_unregister_sysctl(void);
540 static inline int nfs4_register_sysctl(void)
545 static inline void nfs4_unregister_sysctl(void)
551 extern const struct rpc_procinfo nfs4_procedures[];
553 struct nfs4_mount_data;
556 extern const struct svc_version nfs4_callback_version1;
557 extern const struct svc_version nfs4_callback_version4;
559 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
561 memcpy(dst->data, src->data, sizeof(dst->data));
562 dst->type = src->type;
565 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
567 if (dst->type != src->type)
569 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
572 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
574 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
577 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
579 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
582 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
584 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
587 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
588 const nfs4_stateid *stateid)
590 return test_bit(NFS_OPEN_STATE, &state->flags) &&
591 nfs4_stateid_match_other(&state->open_stateid, stateid);
596 #define nfs4_close_state(a, b) do { } while (0)
597 #define nfs4_close_sync(a, b) do { } while (0)
598 #define nfs4_state_protect(a, b, c, d) do { } while (0)
599 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
601 #endif /* CONFIG_NFS_V4 */
602 #endif /* __LINUX_FS_NFS_NFS4_FS.H */