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_RECALL_RUNNING,
46 NFS4CLNT_RECALL_ANY_LAYOUT_READ,
47 NFS4CLNT_RECALL_ANY_LAYOUT_RW,
48 NFS4CLNT_DELEGRETURN_DELAYED,
51 #define NFS4_RENEW_TIMEOUT 0x01
52 #define NFS4_RENEW_DELEGATION_CB 0x02
54 struct nfs_seqid_counter;
55 struct nfs4_minor_version_ops {
59 int (*init_client)(struct nfs_client *);
60 void (*shutdown_client)(struct nfs_client *);
61 bool (*match_stateid)(const nfs4_stateid *,
62 const nfs4_stateid *);
63 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
65 void (*free_lock_state)(struct nfs_server *,
66 struct nfs4_lock_state *);
67 int (*test_and_free_expired)(struct nfs_server *,
68 nfs4_stateid *, const struct cred *);
70 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
71 void (*session_trunk)(struct rpc_clnt *clnt,
72 struct rpc_xprt *xprt, void *data);
73 const struct rpc_call_ops *call_sync_ops;
74 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
75 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
76 const struct nfs4_state_maintenance_ops *state_renewal_ops;
77 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
80 #define NFS_SEQID_CONFIRMED 1
81 struct nfs_seqid_counter {
86 spinlock_t lock; /* Protects the list */
87 struct list_head list; /* Defines sequence of RPC calls */
88 struct rpc_wait_queue wait; /* RPC call delay queue */
92 struct nfs_seqid_counter *sequence;
93 struct list_head list;
94 struct rpc_task *task;
97 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
99 if (seqid_mutating_err(-status))
100 seqid->flags |= NFS_SEQID_CONFIRMED;
104 * NFS4 state_owners and lock_owners are simply labels for ordered
105 * sequences of RPC calls. Their sole purpose is to provide once-only
106 * semantics by allowing the server to identify replayed requests.
108 struct nfs4_state_owner {
109 struct nfs_server *so_server;
110 struct list_head so_lru;
111 unsigned long so_expires;
112 struct rb_node so_server_node;
114 const struct cred *so_cred; /* Associated cred */
118 unsigned long so_flags;
119 struct list_head so_states;
120 struct nfs_seqid_counter so_seqid;
121 seqcount_spinlock_t so_reclaim_seqcount;
122 struct mutex so_delegreturn_mutex;
126 NFS_OWNER_RECLAIM_REBOOT,
127 NFS_OWNER_RECLAIM_NOGRACE
130 #define NFS_LOCK_NEW 0
131 #define NFS_LOCK_RECLAIM 1
132 #define NFS_LOCK_EXPIRED 2
135 * struct nfs4_state maintains the client-side state for a given
136 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
139 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
140 * we need to know how many files are open for reading or writing on a
141 * given inode. This information too is stored here.
143 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
146 struct nfs4_lock_state {
147 struct list_head ls_locks; /* Other lock stateids */
148 struct nfs4_state * ls_state; /* Pointer to open state */
149 #define NFS_LOCK_INITIALIZED 0
150 #define NFS_LOCK_LOST 1
151 unsigned long ls_flags;
152 struct nfs_seqid_counter ls_seqid;
153 nfs4_stateid ls_stateid;
158 /* bits for nfs4_state->flags */
161 NFS_DELEGATED_STATE, /* Current stateid is delegation */
162 NFS_OPEN_STATE, /* OPEN stateid is set */
163 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
164 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
165 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
166 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
167 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
168 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
169 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
170 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
171 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
172 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
173 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/
174 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */
178 struct list_head open_states; /* List of states for the same state_owner */
179 struct list_head inode_states; /* List of states for the same inode */
180 struct list_head lock_states; /* List of subservient lock stateids */
182 struct nfs4_state_owner *owner; /* Pointer to the open owner */
183 struct inode *inode; /* Pointer to the inode */
185 unsigned long flags; /* Do we hold any locks? */
186 spinlock_t state_lock; /* Protects the lock_states list */
188 seqlock_t seqlock; /* Protects the stateid/open_stateid */
189 nfs4_stateid stateid; /* Current stateid: may be delegation */
190 nfs4_stateid open_stateid; /* OPEN stateid */
192 /* The following 3 fields are protected by owner->so_lock */
193 unsigned int n_rdonly; /* Number of read-only references */
194 unsigned int n_wronly; /* Number of write-only references */
195 unsigned int n_rdwr; /* Number of read/write references */
196 fmode_t state; /* State on the server (R,W, or RW) */
199 wait_queue_head_t waitq;
200 struct rcu_head rcu_head;
204 struct nfs4_exception {
205 struct nfs4_state *state;
207 nfs4_stateid *stateid;
209 unsigned char task_is_privileged : 1;
210 unsigned char delay : 1,
216 struct nfs4_state_recovery_ops {
219 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
220 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
221 int (*establish_clid)(struct nfs_client *, const struct cred *);
222 int (*reclaim_complete)(struct nfs_client *, const struct cred *);
223 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
224 const struct cred *);
227 struct nfs4_opendata {
229 struct nfs_openargs o_arg;
230 struct nfs_openres o_res;
231 struct nfs_open_confirmargs c_arg;
232 struct nfs_open_confirmres c_res;
233 struct nfs4_string owner_name;
234 struct nfs4_string group_name;
235 struct nfs4_label *a_label;
236 struct nfs_fattr f_attr;
237 struct nfs4_label *f_label;
239 struct dentry *dentry;
240 struct nfs4_state_owner *owner;
241 struct nfs4_state *state;
243 struct nfs4_layoutget *lgp;
244 unsigned long timestamp;
252 struct nfs4_add_xprt_data {
253 struct nfs_client *clp;
254 const struct cred *cred;
257 struct nfs4_state_maintenance_ops {
258 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
259 const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
260 int (*renew_lease)(struct nfs_client *, const struct cred *);
263 struct nfs4_mig_recovery_ops {
264 int (*get_locations)(struct nfs_server *, struct nfs_fh *,
265 struct nfs4_fs_locations *, struct page *, const struct cred *);
266 int (*fsid_present)(struct inode *, const struct cred *);
269 extern const struct dentry_operations nfs4_dentry_operations;
272 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
276 extern struct file_system_type nfs4_fs_type;
278 /* nfs4namespace.c */
279 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
280 const struct qstr *);
281 int nfs4_submount(struct fs_context *, struct nfs_server *);
282 int nfs4_replace_transport(struct nfs_server *server,
283 const struct nfs4_fs_locations *locations);
284 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr *sa,
285 size_t salen, struct net *net, int port);
287 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
288 extern int nfs4_async_handle_error(struct rpc_task *task,
289 struct nfs_server *server,
290 struct nfs4_state *state, long *timeout);
291 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
292 struct rpc_message *, struct nfs4_sequence_args *,
293 struct nfs4_sequence_res *, int);
294 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
295 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
296 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
297 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
298 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
299 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
300 extern int nfs4_destroy_clientid(struct nfs_client *clp);
301 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
302 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
303 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
304 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
305 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
306 struct nfs4_fs_locations *, struct page *);
307 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
308 struct nfs4_fs_locations *,
309 struct page *page, const struct cred *);
310 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
311 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
315 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
316 extern const struct xattr_handler *nfs4_xattr_handlers[];
317 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
318 const struct nfs_open_context *ctx,
319 const struct nfs_lock_context *l_ctx,
321 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
322 struct nfs_fattr *fattr, struct nfs4_label *label,
323 struct inode *inode);
324 extern int update_open_stateid(struct nfs4_state *state,
325 const nfs4_stateid *open_stateid,
326 const nfs4_stateid *deleg_stateid,
328 extern int nfs4_proc_setlease(struct file *file, long arg,
329 struct file_lock **lease, void **priv);
330 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
331 struct nfs_fsinfo *fsinfo);
332 extern void nfs4_update_changeattr(struct inode *dir,
333 struct nfs4_change_info *cinfo,
334 unsigned long timestamp,
335 unsigned long cache_validity);
336 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
337 struct page **pages);
339 #if defined(CONFIG_NFS_V4_1)
340 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
341 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
342 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
343 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
345 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
346 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
349 is_ds_only_client(struct nfs_client *clp)
351 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
352 EXCHGID4_FLAG_USE_PNFS_DS;
356 is_ds_client(struct nfs_client *clp)
358 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
362 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
363 struct rpc_clnt **clntp, struct rpc_message *msg)
365 rpc_authflavor_t flavor;
367 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
368 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
369 /* Using machine creds for cleanup operations
370 * is only relevent if the client credentials
371 * might expire. So don't bother for
372 * RPC_AUTH_UNIX. If file was only exported to
373 * sec=sys, the PUTFH would fail anyway.
375 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
378 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
379 msg->rpc_cred = rpc_machine_cred();
381 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
382 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
383 flavor != RPC_AUTH_GSS_KRB5P);
384 *clntp = clp->cl_rpcclient;
392 * Function responsible for determining if an rpc_message should use the
393 * machine cred under SP4_MACH_CRED and if so switching the credential and
394 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
395 * Should be called before rpc_call_sync/rpc_call_async.
398 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
399 struct rpc_clnt **clntp, struct rpc_message *msg)
401 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
405 * Special wrapper to nfs4_state_protect for write.
406 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
407 * that use machine cred use NFS_FILE_SYNC.
410 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
411 struct rpc_message *msg, struct nfs_pgio_header *hdr)
413 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
414 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
415 hdr->args.stable = NFS_FILE_SYNC;
417 #else /* CONFIG_NFS_v4_1 */
419 is_ds_only_client(struct nfs_client *clp)
425 is_ds_client(struct nfs_client *clp)
431 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
432 struct rpc_clnt **clntp, struct rpc_message *msg)
437 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
438 struct rpc_message *msg, struct nfs_pgio_header *hdr)
441 #endif /* CONFIG_NFS_V4_1 */
443 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
445 extern const u32 nfs4_fattr_bitmap[3];
446 extern const u32 nfs4_statfs_bitmap[3];
447 extern const u32 nfs4_pathconf_bitmap[3];
448 extern const u32 nfs4_fsinfo_bitmap[3];
449 extern const u32 nfs4_fs_locations_bitmap[3];
451 void nfs40_shutdown_client(struct nfs_client *);
452 void nfs41_shutdown_client(struct nfs_client *);
453 int nfs40_init_client(struct nfs_client *);
454 int nfs41_init_client(struct nfs_client *);
455 void nfs4_free_client(struct nfs_client *);
457 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
460 extern void nfs4_schedule_state_renewal(struct nfs_client *);
461 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
462 extern void nfs4_kill_renewd(struct nfs_client *);
463 extern void nfs4_renew_state(struct work_struct *);
464 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
468 extern const nfs4_stateid current_stateid;
470 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
471 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
472 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
473 int nfs4_discover_server_trunking(struct nfs_client *clp,
474 struct nfs_client **);
475 int nfs40_discover_server_trunking(struct nfs_client *clp,
476 struct nfs_client **, const struct cred *);
477 #if defined(CONFIG_NFS_V4_1)
478 int nfs41_discover_server_trunking(struct nfs_client *clp,
479 struct nfs_client **, const struct cred *);
480 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
481 extern void nfs41_notify_server(struct nfs_client *);
482 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
483 struct nfs41_server_owner *o2);
485 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
488 #endif /* CONFIG_NFS_V4_1 */
490 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
491 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
492 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
493 extern void nfs4_free_state_owners(struct list_head *head);
494 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
495 extern void nfs4_put_open_state(struct nfs4_state *);
496 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
497 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
498 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
499 extern void nfs_inode_find_state_and_recover(struct inode *inode,
500 const nfs4_stateid *stateid);
501 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
502 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
503 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
504 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
505 extern void nfs4_schedule_state_manager(struct nfs_client *);
506 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
507 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
508 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
509 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
510 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
511 extern void nfs41_handle_server_scope(struct nfs_client *,
512 struct nfs41_server_scope **);
513 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
514 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
515 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
516 const struct nfs_lock_context *, nfs4_stateid *,
517 const struct cred **);
518 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
519 struct nfs4_state *state);
521 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
522 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
523 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
524 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
525 extern void nfs_release_seqid(struct nfs_seqid *seqid);
526 extern void nfs_free_seqid(struct nfs_seqid *seqid);
527 extern int nfs4_setup_sequence(struct nfs_client *client,
528 struct nfs4_sequence_args *args,
529 struct nfs4_sequence_res *res,
530 struct rpc_task *task);
531 extern int nfs4_sequence_done(struct rpc_task *task,
532 struct nfs4_sequence_res *res);
534 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
535 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
536 extern const nfs4_stateid zero_stateid;
537 extern const nfs4_stateid invalid_stateid;
540 struct nfs_mount_info;
541 extern struct nfs_subversion nfs_v4;
542 extern bool nfs4_disable_idmapping;
543 extern unsigned short max_session_slots;
544 extern unsigned short max_session_cb_slots;
545 extern unsigned short send_implementation_id;
546 extern bool recover_lost_locks;
548 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
549 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
551 extern int nfs4_try_get_tree(struct fs_context *);
552 extern int nfs4_get_referral_tree(struct fs_context *);
556 int nfs4_register_sysctl(void);
557 void nfs4_unregister_sysctl(void);
559 static inline int nfs4_register_sysctl(void)
564 static inline void nfs4_unregister_sysctl(void)
570 extern const struct rpc_procinfo nfs4_procedures[];
572 #ifdef CONFIG_NFS_V4_2
573 extern const u32 nfs42_maxsetxattr_overhead;
574 extern const u32 nfs42_maxgetxattr_overhead;
575 extern const u32 nfs42_maxlistxattrs_overhead;
578 struct nfs4_mount_data;
581 extern const struct svc_version nfs4_callback_version1;
582 extern const struct svc_version nfs4_callback_version4;
584 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
586 memcpy(dst->data, src->data, sizeof(dst->data));
587 dst->type = src->type;
590 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
592 if (dst->type != src->type)
594 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
597 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
599 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
602 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
604 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
607 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
609 u32 seq1 = be32_to_cpu(s1->seqid);
610 u32 seq2 = be32_to_cpu(s2->seqid);
612 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
615 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
617 return nfs4_stateid_match_other(dst, src) &&
618 !(src->seqid && nfs4_stateid_is_newer(dst, src));
621 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
623 u32 seqid = be32_to_cpu(s1->seqid);
627 s1->seqid = cpu_to_be32(seqid);
630 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
632 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
635 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
636 const nfs4_stateid *stateid)
638 return test_bit(NFS_OPEN_STATE, &state->flags) &&
639 nfs4_stateid_match_other(&state->open_stateid, stateid);
643 #ifdef CONFIG_NFS_V4_2
644 extern int __init nfs4_xattr_cache_init(void);
645 extern void nfs4_xattr_cache_exit(void);
646 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
647 const char *buf, struct page **pages,
649 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
650 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
651 char *buf, ssize_t buflen);
652 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
654 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
656 extern void nfs4_xattr_cache_zap(struct inode *inode);
658 static inline void nfs4_xattr_cache_zap(struct inode *inode)
661 #endif /* CONFIG_NFS_V4_2 */
663 #else /* CONFIG_NFS_V4 */
665 #define nfs4_close_state(a, b) do { } while (0)
666 #define nfs4_close_sync(a, b) do { } while (0)
667 #define nfs4_state_protect(a, b, c, d) do { } while (0)
668 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
671 #endif /* CONFIG_NFS_V4 */
672 #endif /* __LINUX_FS_NFS_NFS4_FS.H */