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_MANAGER_AVAILABLE,
46 NFS4CLNT_RECALL_RUNNING,
47 NFS4CLNT_RECALL_ANY_LAYOUT_READ,
48 NFS4CLNT_RECALL_ANY_LAYOUT_RW,
49 NFS4CLNT_DELEGRETURN_DELAYED,
52 #define NFS4_RENEW_TIMEOUT 0x01
53 #define NFS4_RENEW_DELEGATION_CB 0x02
55 struct nfs_seqid_counter;
56 struct nfs4_minor_version_ops {
60 int (*init_client)(struct nfs_client *);
61 void (*shutdown_client)(struct nfs_client *);
62 bool (*match_stateid)(const nfs4_stateid *,
63 const nfs4_stateid *);
64 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
66 void (*free_lock_state)(struct nfs_server *,
67 struct nfs4_lock_state *);
68 int (*test_and_free_expired)(struct nfs_server *,
69 nfs4_stateid *, const struct cred *);
71 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
72 void (*session_trunk)(struct rpc_clnt *clnt,
73 struct rpc_xprt *xprt, void *data);
74 const struct rpc_call_ops *call_sync_ops;
75 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
76 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
77 const struct nfs4_state_maintenance_ops *state_renewal_ops;
78 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
81 #define NFS_SEQID_CONFIRMED 1
82 struct nfs_seqid_counter {
87 spinlock_t lock; /* Protects the list */
88 struct list_head list; /* Defines sequence of RPC calls */
89 struct rpc_wait_queue wait; /* RPC call delay queue */
93 struct nfs_seqid_counter *sequence;
94 struct list_head list;
95 struct rpc_task *task;
98 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
100 if (seqid_mutating_err(-status))
101 seqid->flags |= NFS_SEQID_CONFIRMED;
105 * NFS4 state_owners and lock_owners are simply labels for ordered
106 * sequences of RPC calls. Their sole purpose is to provide once-only
107 * semantics by allowing the server to identify replayed requests.
109 struct nfs4_state_owner {
110 struct nfs_server *so_server;
111 struct list_head so_lru;
112 unsigned long so_expires;
113 struct rb_node so_server_node;
115 const struct cred *so_cred; /* Associated cred */
119 unsigned long so_flags;
120 struct list_head so_states;
121 struct nfs_seqid_counter so_seqid;
122 seqcount_spinlock_t so_reclaim_seqcount;
123 struct mutex so_delegreturn_mutex;
127 NFS_OWNER_RECLAIM_REBOOT,
128 NFS_OWNER_RECLAIM_NOGRACE
131 #define NFS_LOCK_NEW 0
132 #define NFS_LOCK_RECLAIM 1
133 #define NFS_LOCK_EXPIRED 2
136 * struct nfs4_state maintains the client-side state for a given
137 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
140 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
141 * we need to know how many files are open for reading or writing on a
142 * given inode. This information too is stored here.
144 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
147 struct nfs4_lock_state {
148 struct list_head ls_locks; /* Other lock stateids */
149 struct nfs4_state * ls_state; /* Pointer to open state */
150 #define NFS_LOCK_INITIALIZED 0
151 #define NFS_LOCK_LOST 1
152 unsigned long ls_flags;
153 struct nfs_seqid_counter ls_seqid;
154 nfs4_stateid ls_stateid;
159 /* bits for nfs4_state->flags */
162 NFS_DELEGATED_STATE, /* Current stateid is delegation */
163 NFS_OPEN_STATE, /* OPEN stateid is set */
164 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
165 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
166 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
167 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
168 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
169 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
170 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
171 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
172 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
173 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
174 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/
175 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */
179 struct list_head open_states; /* List of states for the same state_owner */
180 struct list_head inode_states; /* List of states for the same inode */
181 struct list_head lock_states; /* List of subservient lock stateids */
183 struct nfs4_state_owner *owner; /* Pointer to the open owner */
184 struct inode *inode; /* Pointer to the inode */
186 unsigned long flags; /* Do we hold any locks? */
187 spinlock_t state_lock; /* Protects the lock_states list */
189 seqlock_t seqlock; /* Protects the stateid/open_stateid */
190 nfs4_stateid stateid; /* Current stateid: may be delegation */
191 nfs4_stateid open_stateid; /* OPEN stateid */
193 /* The following 3 fields are protected by owner->so_lock */
194 unsigned int n_rdonly; /* Number of read-only references */
195 unsigned int n_wronly; /* Number of write-only references */
196 unsigned int n_rdwr; /* Number of read/write references */
197 fmode_t state; /* State on the server (R,W, or RW) */
200 wait_queue_head_t waitq;
201 struct rcu_head rcu_head;
205 struct nfs4_exception {
206 struct nfs4_state *state;
208 nfs4_stateid *stateid;
210 unsigned char task_is_privileged : 1;
211 unsigned char delay : 1,
217 struct nfs4_state_recovery_ops {
220 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
221 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
222 int (*establish_clid)(struct nfs_client *, const struct cred *);
223 int (*reclaim_complete)(struct nfs_client *, const struct cred *);
224 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
225 const struct cred *);
228 struct nfs4_opendata {
230 struct nfs_openargs o_arg;
231 struct nfs_openres o_res;
232 struct nfs_open_confirmargs c_arg;
233 struct nfs_open_confirmres c_res;
234 struct nfs4_string owner_name;
235 struct nfs4_string group_name;
236 struct nfs4_label *a_label;
237 struct nfs_fattr f_attr;
238 struct nfs4_label *f_label;
240 struct dentry *dentry;
241 struct nfs4_state_owner *owner;
242 struct nfs4_state *state;
244 struct nfs4_layoutget *lgp;
245 unsigned long timestamp;
253 struct nfs4_add_xprt_data {
254 struct nfs_client *clp;
255 const struct cred *cred;
258 struct nfs4_state_maintenance_ops {
259 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
260 const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
261 int (*renew_lease)(struct nfs_client *, const struct cred *);
264 struct nfs4_mig_recovery_ops {
265 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
266 struct page *, const struct cred *);
267 int (*fsid_present)(struct inode *, const struct cred *);
270 extern const struct dentry_operations nfs4_dentry_operations;
273 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
277 extern struct file_system_type nfs4_fs_type;
279 /* nfs4namespace.c */
280 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
281 const struct qstr *);
282 int nfs4_submount(struct fs_context *, struct nfs_server *);
283 int nfs4_replace_transport(struct nfs_server *server,
284 const struct nfs4_fs_locations *locations);
285 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr *sa,
286 size_t salen, struct net *net, int port);
288 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
289 extern int nfs4_async_handle_error(struct rpc_task *task,
290 struct nfs_server *server,
291 struct nfs4_state *state, long *timeout);
292 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
293 struct rpc_message *, struct nfs4_sequence_args *,
294 struct nfs4_sequence_res *, int);
295 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
296 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
297 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
298 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
299 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
300 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
301 extern int nfs4_destroy_clientid(struct nfs_client *clp);
302 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
303 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
304 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
305 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
306 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
307 struct nfs4_fs_locations *, struct page *);
308 extern int nfs4_proc_get_locations(struct inode *, 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,
329 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
330 struct nfs_fsinfo *fsinfo);
331 extern void nfs4_update_changeattr(struct inode *dir,
332 struct nfs4_change_info *cinfo,
333 unsigned long timestamp,
334 unsigned long cache_validity);
335 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
336 struct page **pages);
338 #if defined(CONFIG_NFS_V4_1)
339 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
340 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
341 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
342 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
344 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
345 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
348 is_ds_only_client(struct nfs_client *clp)
350 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
351 EXCHGID4_FLAG_USE_PNFS_DS;
355 is_ds_client(struct nfs_client *clp)
357 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
361 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
362 struct rpc_clnt **clntp, struct rpc_message *msg)
364 rpc_authflavor_t flavor;
366 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
367 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
368 /* Using machine creds for cleanup operations
369 * is only relevent if the client credentials
370 * might expire. So don't bother for
371 * RPC_AUTH_UNIX. If file was only exported to
372 * sec=sys, the PUTFH would fail anyway.
374 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
377 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
378 msg->rpc_cred = rpc_machine_cred();
380 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
381 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
382 flavor != RPC_AUTH_GSS_KRB5P);
383 *clntp = clp->cl_rpcclient;
391 * Function responsible for determining if an rpc_message should use the
392 * machine cred under SP4_MACH_CRED and if so switching the credential and
393 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
394 * Should be called before rpc_call_sync/rpc_call_async.
397 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
398 struct rpc_clnt **clntp, struct rpc_message *msg)
400 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
404 * Special wrapper to nfs4_state_protect for write.
405 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
406 * that use machine cred use NFS_FILE_SYNC.
409 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
410 struct rpc_message *msg, struct nfs_pgio_header *hdr)
412 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
413 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
414 hdr->args.stable = NFS_FILE_SYNC;
416 #else /* CONFIG_NFS_v4_1 */
418 is_ds_only_client(struct nfs_client *clp)
424 is_ds_client(struct nfs_client *clp)
430 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
431 struct rpc_clnt **clntp, struct rpc_message *msg)
436 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
437 struct rpc_message *msg, struct nfs_pgio_header *hdr)
440 #endif /* CONFIG_NFS_V4_1 */
442 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
444 extern const u32 nfs4_fattr_bitmap[3];
445 extern const u32 nfs4_statfs_bitmap[3];
446 extern const u32 nfs4_pathconf_bitmap[3];
447 extern const u32 nfs4_fsinfo_bitmap[3];
448 extern const u32 nfs4_fs_locations_bitmap[3];
450 void nfs40_shutdown_client(struct nfs_client *);
451 void nfs41_shutdown_client(struct nfs_client *);
452 int nfs40_init_client(struct nfs_client *);
453 int nfs41_init_client(struct nfs_client *);
454 void nfs4_free_client(struct nfs_client *);
456 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
459 extern void nfs4_schedule_state_renewal(struct nfs_client *);
460 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
461 extern void nfs4_kill_renewd(struct nfs_client *);
462 extern void nfs4_renew_state(struct work_struct *);
463 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
467 extern const nfs4_stateid current_stateid;
469 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
470 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
471 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
472 int nfs4_discover_server_trunking(struct nfs_client *clp,
473 struct nfs_client **);
474 int nfs40_discover_server_trunking(struct nfs_client *clp,
475 struct nfs_client **, const struct cred *);
476 #if defined(CONFIG_NFS_V4_1)
477 int nfs41_discover_server_trunking(struct nfs_client *clp,
478 struct nfs_client **, const struct cred *);
479 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
480 extern void nfs41_notify_server(struct nfs_client *);
481 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
482 struct nfs41_server_owner *o2);
484 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
487 #endif /* CONFIG_NFS_V4_1 */
489 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
490 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
491 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
492 extern void nfs4_free_state_owners(struct list_head *head);
493 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
494 extern void nfs4_put_open_state(struct nfs4_state *);
495 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
496 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
497 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
498 extern void nfs_inode_find_state_and_recover(struct inode *inode,
499 const nfs4_stateid *stateid);
500 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
501 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
502 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
503 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
504 extern void nfs4_schedule_state_manager(struct nfs_client *);
505 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
506 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
507 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
508 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
509 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
510 extern void nfs41_handle_server_scope(struct nfs_client *,
511 struct nfs41_server_scope **);
512 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
513 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
514 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
515 const struct nfs_lock_context *, nfs4_stateid *,
516 const struct cred **);
517 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
518 struct nfs4_state *state);
520 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
521 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
522 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
523 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
524 extern void nfs_release_seqid(struct nfs_seqid *seqid);
525 extern void nfs_free_seqid(struct nfs_seqid *seqid);
526 extern int nfs4_setup_sequence(struct nfs_client *client,
527 struct nfs4_sequence_args *args,
528 struct nfs4_sequence_res *res,
529 struct rpc_task *task);
530 extern int nfs4_sequence_done(struct rpc_task *task,
531 struct nfs4_sequence_res *res);
533 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
534 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
535 extern const nfs4_stateid zero_stateid;
536 extern const nfs4_stateid invalid_stateid;
539 struct nfs_mount_info;
540 extern struct nfs_subversion nfs_v4;
541 extern bool nfs4_disable_idmapping;
542 extern unsigned short max_session_slots;
543 extern unsigned short max_session_cb_slots;
544 extern unsigned short send_implementation_id;
545 extern bool recover_lost_locks;
547 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
548 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
550 extern int nfs4_try_get_tree(struct fs_context *);
551 extern int nfs4_get_referral_tree(struct fs_context *);
555 int nfs4_register_sysctl(void);
556 void nfs4_unregister_sysctl(void);
558 static inline int nfs4_register_sysctl(void)
563 static inline void nfs4_unregister_sysctl(void)
569 extern const struct rpc_procinfo nfs4_procedures[];
571 #ifdef CONFIG_NFS_V4_2
572 extern const u32 nfs42_maxsetxattr_overhead;
573 extern const u32 nfs42_maxgetxattr_overhead;
574 extern const u32 nfs42_maxlistxattrs_overhead;
577 struct nfs4_mount_data;
580 extern const struct svc_version nfs4_callback_version1;
581 extern const struct svc_version nfs4_callback_version4;
583 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
585 memcpy(dst->data, src->data, sizeof(dst->data));
586 dst->type = src->type;
589 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
591 if (dst->type != src->type)
593 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
596 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
598 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
601 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
603 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
606 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
608 u32 seq1 = be32_to_cpu(s1->seqid);
609 u32 seq2 = be32_to_cpu(s2->seqid);
611 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
614 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
616 return nfs4_stateid_match_other(dst, src) &&
617 !(src->seqid && nfs4_stateid_is_newer(dst, src));
620 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
622 u32 seqid = be32_to_cpu(s1->seqid);
626 s1->seqid = cpu_to_be32(seqid);
629 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
631 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
634 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
635 const nfs4_stateid *stateid)
637 return test_bit(NFS_OPEN_STATE, &state->flags) &&
638 nfs4_stateid_match_other(&state->open_stateid, stateid);
642 #ifdef CONFIG_NFS_V4_2
643 extern int __init nfs4_xattr_cache_init(void);
644 extern void nfs4_xattr_cache_exit(void);
645 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
646 const char *buf, struct page **pages,
648 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
649 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
650 char *buf, ssize_t buflen);
651 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
653 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
655 extern void nfs4_xattr_cache_zap(struct inode *inode);
657 static inline void nfs4_xattr_cache_zap(struct inode *inode)
660 #endif /* CONFIG_NFS_V4_2 */
662 #else /* CONFIG_NFS_V4 */
664 #define nfs4_close_state(a, b) do { } while (0)
665 #define nfs4_close_sync(a, b) do { } while (0)
666 #define nfs4_state_protect(a, b, c, d) do { } while (0)
667 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
670 #endif /* CONFIG_NFS_V4 */
671 #endif /* __LINUX_FS_NFS_NFS4_FS.H */