xref: /openbmc/linux/fs/nfs/nfs4_fs.h (revision f33ac92f)
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 
27 struct idmap;
28 
29 enum 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 	NFS4CLNT_RUN_MANAGER,
45 	NFS4CLNT_RECALL_RUNNING,
46 	NFS4CLNT_RECALL_ANY_LAYOUT_READ,
47 	NFS4CLNT_RECALL_ANY_LAYOUT_RW,
48 	NFS4CLNT_DELEGRETURN_DELAYED,
49 };
50 
51 #define NFS4_RENEW_TIMEOUT		0x01
52 #define NFS4_RENEW_DELEGATION_CB	0x02
53 
54 struct nfs_seqid_counter;
55 struct nfs4_minor_version_ops {
56 	u32	minor_version;
57 	unsigned init_caps;
58 
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 *,
64 			struct nfs_fsinfo *);
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 *);
69 	struct nfs_seqid *
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;
78 };
79 
80 #define NFS_SEQID_CONFIRMED 1
81 struct nfs_seqid_counter {
82 	ktime_t create_time;
83 	int owner_id;
84 	int flags;
85 	u32 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 */
89 };
90 
91 struct nfs_seqid {
92 	struct nfs_seqid_counter *sequence;
93 	struct list_head list;
94 	struct rpc_task *task;
95 };
96 
97 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
98 {
99 	if (seqid_mutating_err(-status))
100 		seqid->flags |= NFS_SEQID_CONFIRMED;
101 }
102 
103 /*
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.
107  */
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;
113 
114 	const struct cred    *so_cred;	 /* Associated cred */
115 
116 	spinlock_t	     so_lock;
117 	atomic_t	     so_count;
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;
123 };
124 
125 enum {
126 	NFS_OWNER_RECLAIM_REBOOT,
127 	NFS_OWNER_RECLAIM_NOGRACE
128 };
129 
130 #define NFS_LOCK_NEW		0
131 #define NFS_LOCK_RECLAIM	1
132 #define NFS_LOCK_EXPIRED	2
133 
134 /*
135  * struct nfs4_state maintains the client-side state for a given
136  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
137  *
138  * OPEN:
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.
142  *
143  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
144  */
145 
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;
154 	refcount_t		ls_count;
155 	fl_owner_t		ls_owner;
156 };
157 
158 /* bits for nfs4_state->flags */
159 enum {
160 	LK_STATE_IN_USE,
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 */
175 };
176 
177 struct nfs4_state {
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 */
181 
182 	struct nfs4_state_owner *owner;	/* Pointer to the open owner */
183 	struct inode *inode;		/* Pointer to the inode */
184 
185 	unsigned long flags;		/* Do we hold any locks? */
186 	spinlock_t state_lock;		/* Protects the lock_states list */
187 
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 */
191 
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) */
197 	refcount_t count;
198 
199 	wait_queue_head_t waitq;
200 	struct rcu_head rcu_head;
201 };
202 
203 
204 struct nfs4_exception {
205 	struct nfs4_state *state;
206 	struct inode *inode;
207 	nfs4_stateid *stateid;
208 	long timeout;
209 	unsigned char task_is_privileged : 1;
210 	unsigned char delay : 1,
211 		      recovering : 1,
212 		      retry : 1;
213 	bool interruptible;
214 };
215 
216 struct nfs4_state_recovery_ops {
217 	int owner_flag_bit;
218 	int state_flag_bit;
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 *);
225 };
226 
227 struct nfs4_opendata {
228 	struct kref kref;
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 dentry *dir;
238 	struct dentry *dentry;
239 	struct nfs4_state_owner *owner;
240 	struct nfs4_state *state;
241 	struct iattr attrs;
242 	struct nfs4_layoutget *lgp;
243 	unsigned long timestamp;
244 	bool rpc_done;
245 	bool file_created;
246 	bool is_recover;
247 	bool cancelled;
248 	int rpc_status;
249 };
250 
251 struct nfs4_add_xprt_data {
252 	struct nfs_client	*clp;
253 	const struct cred	*cred;
254 };
255 
256 struct nfs4_state_maintenance_ops {
257 	int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
258 	const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
259 	int (*renew_lease)(struct nfs_client *, const struct cred *);
260 };
261 
262 struct nfs4_mig_recovery_ops {
263 	int (*get_locations)(struct nfs_server *, struct nfs_fh *,
264 		struct nfs4_fs_locations *, struct page *, const struct cred *);
265 	int (*fsid_present)(struct inode *, const struct cred *);
266 };
267 
268 extern const struct dentry_operations nfs4_dentry_operations;
269 
270 /* dir.c */
271 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
272 		    unsigned, umode_t);
273 
274 /* fs_context.c */
275 extern struct file_system_type nfs4_fs_type;
276 
277 /* nfs4namespace.c */
278 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
279 					 const struct qstr *);
280 int nfs4_submount(struct fs_context *, struct nfs_server *);
281 int nfs4_replace_transport(struct nfs_server *server,
282 				const struct nfs4_fs_locations *locations);
283 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr *sa,
284 			     size_t salen, struct net *net, int port);
285 /* nfs4proc.c */
286 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
287 extern int nfs4_async_handle_error(struct rpc_task *task,
288 				   struct nfs_server *server,
289 				   struct nfs4_state *state, long *timeout);
290 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
291 			  struct rpc_message *, struct nfs4_sequence_args *,
292 			  struct nfs4_sequence_res *, int);
293 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
294 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
295 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
296 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
297 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
298 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
299 extern int nfs4_destroy_clientid(struct nfs_client *clp);
300 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
301 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
302 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
303 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
304 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
305 				  struct nfs4_fs_locations *, struct page *);
306 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
307 				   struct nfs4_fs_locations *,
308 				   struct page *page, const struct cred *);
309 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
310 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
311 						    struct dentry *,
312 						    struct nfs_fh *,
313 						    struct nfs_fattr *);
314 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
315 extern const struct xattr_handler *nfs4_xattr_handlers[];
316 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
317 		const struct nfs_open_context *ctx,
318 		const struct nfs_lock_context *l_ctx,
319 		fmode_t fmode);
320 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
321 			     struct inode *inode, unsigned long cache_validity);
322 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
323 			     struct nfs_fattr *fattr, 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,
327 				fmode_t fmode);
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);
338 
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,
344 				  bool sync);
345 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
346 		struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
347 
348 static inline bool
349 is_ds_only_client(struct nfs_client *clp)
350 {
351 	return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
352 		EXCHGID4_FLAG_USE_PNFS_DS;
353 }
354 
355 static inline bool
356 is_ds_client(struct nfs_client *clp)
357 {
358 	return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
359 }
360 
361 static inline bool
362 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
363 		    struct rpc_clnt **clntp, struct rpc_message *msg)
364 {
365 	rpc_authflavor_t flavor;
366 
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.
374 		 */
375 		if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
376 			return false;
377 	}
378 	if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
379 		msg->rpc_cred = rpc_machine_cred();
380 
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;
385 
386 		return true;
387 	}
388 	return false;
389 }
390 
391 /*
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.
396  */
397 static inline void
398 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
399 		   struct rpc_clnt **clntp, struct rpc_message *msg)
400 {
401 	_nfs4_state_protect(clp, sp4_mode, clntp, msg);
402 }
403 
404 /*
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.
408  */
409 static inline void
410 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
411 			 struct rpc_message *msg, struct nfs_pgio_header *hdr)
412 {
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;
416 }
417 #else /* CONFIG_NFS_v4_1 */
418 static inline bool
419 is_ds_only_client(struct nfs_client *clp)
420 {
421 	return false;
422 }
423 
424 static inline bool
425 is_ds_client(struct nfs_client *clp)
426 {
427 	return false;
428 }
429 
430 static inline void
431 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
432 		   struct rpc_clnt **clntp, struct rpc_message *msg)
433 {
434 }
435 
436 static inline void
437 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
438 			 struct rpc_message *msg, struct nfs_pgio_header *hdr)
439 {
440 }
441 #endif /* CONFIG_NFS_V4_1 */
442 
443 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
444 
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];
450 
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 *);
456 
457 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
458 
459 /* nfs4renewd.c */
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);
465 
466 
467 /* nfs4state.c */
468 extern const nfs4_stateid current_stateid;
469 
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);
484 #else
485 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
486 {
487 }
488 #endif /* CONFIG_NFS_V4_1 */
489 
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);
520 
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);
533 
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;
538 
539 /* nfs4super.c */
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;
547 
548 #define NFS4_CLIENT_ID_UNIQ_LEN		(64)
549 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
550 
551 extern int nfs4_try_get_tree(struct fs_context *);
552 extern int nfs4_get_referral_tree(struct fs_context *);
553 
554 /* nfs4sysctl.c */
555 #ifdef CONFIG_SYSCTL
556 int nfs4_register_sysctl(void);
557 void nfs4_unregister_sysctl(void);
558 #else
559 static inline int nfs4_register_sysctl(void)
560 {
561 	return 0;
562 }
563 
564 static inline void nfs4_unregister_sysctl(void)
565 {
566 }
567 #endif
568 
569 /* nfs4xdr.c */
570 extern const struct rpc_procinfo nfs4_procedures[];
571 
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;
576 #endif
577 
578 struct nfs4_mount_data;
579 
580 /* callback_xdr.c */
581 extern const struct svc_version nfs4_callback_version1;
582 extern const struct svc_version nfs4_callback_version4;
583 
584 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
585 {
586 	memcpy(dst->data, src->data, sizeof(dst->data));
587 	dst->type = src->type;
588 }
589 
590 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
591 {
592 	if (dst->type != src->type)
593 		return false;
594 	return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
595 }
596 
597 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
598 {
599 	return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
600 }
601 
602 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
603 {
604 	return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
605 }
606 
607 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
608 {
609 	u32 seq1 = be32_to_cpu(s1->seqid);
610 	u32 seq2 = be32_to_cpu(s2->seqid);
611 
612 	return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
613 }
614 
615 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
616 {
617 	return nfs4_stateid_match_other(dst, src) &&
618 		!(src->seqid && nfs4_stateid_is_newer(dst, src));
619 }
620 
621 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
622 {
623 	u32 seqid = be32_to_cpu(s1->seqid);
624 
625 	if (++seqid == 0)
626 		++seqid;
627 	s1->seqid = cpu_to_be32(seqid);
628 }
629 
630 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
631 {
632 	return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
633 }
634 
635 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
636 		const nfs4_stateid *stateid)
637 {
638 	return test_bit(NFS_OPEN_STATE, &state->flags) &&
639 		nfs4_stateid_match_other(&state->open_stateid, stateid);
640 }
641 
642 /* nfs42xattr.c */
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,
648 				 ssize_t buflen);
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,
653 				      ssize_t buflen);
654 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
655 				     ssize_t buflen);
656 extern void nfs4_xattr_cache_zap(struct inode *inode);
657 #else
658 static inline void nfs4_xattr_cache_zap(struct inode *inode)
659 {
660 }
661 #endif /* CONFIG_NFS_V4_2 */
662 
663 #else /* CONFIG_NFS_V4 */
664 
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)
669 
670 
671 #endif /* CONFIG_NFS_V4 */
672 #endif /* __LINUX_FS_NFS_NFS4_FS.H */
673