xref: /openbmc/linux/fs/nfs/nfs4_fs.h (revision 9ac17575)
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  };
49  
50  #define NFS4_RENEW_TIMEOUT		0x01
51  #define NFS4_RENEW_DELEGATION_CB	0x02
52  
53  struct nfs_seqid_counter;
54  struct nfs4_minor_version_ops {
55  	u32	minor_version;
56  	unsigned init_caps;
57  
58  	int	(*init_client)(struct nfs_client *);
59  	void	(*shutdown_client)(struct nfs_client *);
60  	bool	(*match_stateid)(const nfs4_stateid *,
61  			const nfs4_stateid *);
62  	int	(*find_root_sec)(struct nfs_server *, struct nfs_fh *,
63  			struct nfs_fsinfo *);
64  	void	(*free_lock_state)(struct nfs_server *,
65  			struct nfs4_lock_state *);
66  	int	(*test_and_free_expired)(struct nfs_server *,
67  			nfs4_stateid *, const struct cred *);
68  	struct nfs_seqid *
69  		(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
70  	void	(*session_trunk)(struct rpc_clnt *clnt,
71  			struct rpc_xprt *xprt, void *data);
72  	const struct rpc_call_ops *call_sync_ops;
73  	const struct nfs4_state_recovery_ops *reboot_recovery_ops;
74  	const struct nfs4_state_recovery_ops *nograce_recovery_ops;
75  	const struct nfs4_state_maintenance_ops *state_renewal_ops;
76  	const struct nfs4_mig_recovery_ops *mig_recovery_ops;
77  };
78  
79  #define NFS_SEQID_CONFIRMED 1
80  struct nfs_seqid_counter {
81  	ktime_t create_time;
82  	int owner_id;
83  	int flags;
84  	u32 counter;
85  	spinlock_t lock;		/* Protects the list */
86  	struct list_head list;		/* Defines sequence of RPC calls */
87  	struct rpc_wait_queue	wait;	/* RPC call delay queue */
88  };
89  
90  struct nfs_seqid {
91  	struct nfs_seqid_counter *sequence;
92  	struct list_head list;
93  	struct rpc_task *task;
94  };
95  
96  static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
97  {
98  	if (seqid_mutating_err(-status))
99  		seqid->flags |= NFS_SEQID_CONFIRMED;
100  }
101  
102  /*
103   * NFS4 state_owners and lock_owners are simply labels for ordered
104   * sequences of RPC calls. Their sole purpose is to provide once-only
105   * semantics by allowing the server to identify replayed requests.
106   */
107  struct nfs4_state_owner {
108  	struct nfs_server    *so_server;
109  	struct list_head     so_lru;
110  	unsigned long        so_expires;
111  	struct rb_node	     so_server_node;
112  
113  	const struct cred    *so_cred;	 /* Associated cred */
114  
115  	spinlock_t	     so_lock;
116  	atomic_t	     so_count;
117  	unsigned long	     so_flags;
118  	struct list_head     so_states;
119  	struct nfs_seqid_counter so_seqid;
120  	seqcount_t	     so_reclaim_seqcount;
121  	struct mutex	     so_delegreturn_mutex;
122  };
123  
124  enum {
125  	NFS_OWNER_RECLAIM_REBOOT,
126  	NFS_OWNER_RECLAIM_NOGRACE
127  };
128  
129  #define NFS_LOCK_NEW		0
130  #define NFS_LOCK_RECLAIM	1
131  #define NFS_LOCK_EXPIRED	2
132  
133  /*
134   * struct nfs4_state maintains the client-side state for a given
135   * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
136   *
137   * OPEN:
138   * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
139   * we need to know how many files are open for reading or writing on a
140   * given inode. This information too is stored here.
141   *
142   * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
143   */
144  
145  struct nfs4_lock_state {
146  	struct list_head	ls_locks;	/* Other lock stateids */
147  	struct nfs4_state *	ls_state;	/* Pointer to open state */
148  #define NFS_LOCK_INITIALIZED 0
149  #define NFS_LOCK_LOST        1
150  	unsigned long		ls_flags;
151  	struct nfs_seqid_counter	ls_seqid;
152  	nfs4_stateid		ls_stateid;
153  	refcount_t		ls_count;
154  	fl_owner_t		ls_owner;
155  };
156  
157  /* bits for nfs4_state->flags */
158  enum {
159  	LK_STATE_IN_USE,
160  	NFS_DELEGATED_STATE,		/* Current stateid is delegation */
161  	NFS_OPEN_STATE,			/* OPEN stateid is set */
162  	NFS_O_RDONLY_STATE,		/* OPEN stateid has read-only state */
163  	NFS_O_WRONLY_STATE,		/* OPEN stateid has write-only state */
164  	NFS_O_RDWR_STATE,		/* OPEN stateid has read/write state */
165  	NFS_STATE_RECLAIM_REBOOT,	/* OPEN stateid server rebooted */
166  	NFS_STATE_RECLAIM_NOGRACE,	/* OPEN stateid needs to recover state */
167  	NFS_STATE_POSIX_LOCKS,		/* Posix locks are supported */
168  	NFS_STATE_RECOVERY_FAILED,	/* OPEN stateid state recovery failed */
169  	NFS_STATE_MAY_NOTIFY_LOCK,	/* server may CB_NOTIFY_LOCK */
170  	NFS_STATE_CHANGE_WAIT,		/* A state changing operation is outstanding */
171  	NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
172  	NFS_CLNT_SRC_SSC_COPY_STATE,    /* src server open state on client*/
173  	NFS_SRV_SSC_COPY_STATE,		/* ssc state on the dst server */
174  };
175  
176  struct nfs4_state {
177  	struct list_head open_states;	/* List of states for the same state_owner */
178  	struct list_head inode_states;	/* List of states for the same inode */
179  	struct list_head lock_states;	/* List of subservient lock stateids */
180  
181  	struct nfs4_state_owner *owner;	/* Pointer to the open owner */
182  	struct inode *inode;		/* Pointer to the inode */
183  
184  	unsigned long flags;		/* Do we hold any locks? */
185  	spinlock_t state_lock;		/* Protects the lock_states list */
186  
187  	seqlock_t seqlock;		/* Protects the stateid/open_stateid */
188  	nfs4_stateid stateid;		/* Current stateid: may be delegation */
189  	nfs4_stateid open_stateid;	/* OPEN stateid */
190  
191  	/* The following 3 fields are protected by owner->so_lock */
192  	unsigned int n_rdonly;		/* Number of read-only references */
193  	unsigned int n_wronly;		/* Number of write-only references */
194  	unsigned int n_rdwr;		/* Number of read/write references */
195  	fmode_t state;			/* State on the server (R,W, or RW) */
196  	refcount_t count;
197  
198  	wait_queue_head_t waitq;
199  	struct rcu_head rcu_head;
200  };
201  
202  
203  struct nfs4_exception {
204  	struct nfs4_state *state;
205  	struct inode *inode;
206  	nfs4_stateid *stateid;
207  	long timeout;
208  	unsigned char delay : 1,
209  		      recovering : 1,
210  		      retry : 1;
211  	bool interruptible;
212  };
213  
214  struct nfs4_state_recovery_ops {
215  	int owner_flag_bit;
216  	int state_flag_bit;
217  	int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
218  	int (*recover_lock)(struct nfs4_state *, struct file_lock *);
219  	int (*establish_clid)(struct nfs_client *, const struct cred *);
220  	int (*reclaim_complete)(struct nfs_client *, const struct cred *);
221  	int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
222  		const struct cred *);
223  };
224  
225  struct nfs4_opendata {
226  	struct kref kref;
227  	struct nfs_openargs o_arg;
228  	struct nfs_openres o_res;
229  	struct nfs_open_confirmargs c_arg;
230  	struct nfs_open_confirmres c_res;
231  	struct nfs4_string owner_name;
232  	struct nfs4_string group_name;
233  	struct nfs4_label *a_label;
234  	struct nfs_fattr f_attr;
235  	struct nfs4_label *f_label;
236  	struct dentry *dir;
237  	struct dentry *dentry;
238  	struct nfs4_state_owner *owner;
239  	struct nfs4_state *state;
240  	struct iattr attrs;
241  	struct nfs4_layoutget *lgp;
242  	unsigned long timestamp;
243  	bool rpc_done;
244  	bool file_created;
245  	bool is_recover;
246  	bool cancelled;
247  	int rpc_status;
248  };
249  
250  struct nfs4_add_xprt_data {
251  	struct nfs_client	*clp;
252  	const struct cred	*cred;
253  };
254  
255  struct nfs4_state_maintenance_ops {
256  	int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
257  	const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
258  	int (*renew_lease)(struct nfs_client *, const struct cred *);
259  };
260  
261  struct nfs4_mig_recovery_ops {
262  	int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
263  		struct page *, const struct cred *);
264  	int (*fsid_present)(struct inode *, const struct cred *);
265  };
266  
267  extern const struct dentry_operations nfs4_dentry_operations;
268  
269  /* dir.c */
270  int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
271  		    unsigned, umode_t);
272  
273  /* fs_context.c */
274  extern struct file_system_type nfs4_fs_type;
275  
276  /* nfs4namespace.c */
277  struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
278  					 const struct qstr *);
279  int nfs4_submount(struct fs_context *, struct nfs_server *);
280  int nfs4_replace_transport(struct nfs_server *server,
281  				const struct nfs4_fs_locations *locations);
282  
283  /* nfs4proc.c */
284  extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
285  extern int nfs4_async_handle_error(struct rpc_task *task,
286  				   struct nfs_server *server,
287  				   struct nfs4_state *state, long *timeout);
288  extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
289  			  struct rpc_message *, struct nfs4_sequence_args *,
290  			  struct nfs4_sequence_res *, int);
291  extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
292  extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
293  extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
294  extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
295  extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
296  extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
297  extern int nfs4_destroy_clientid(struct nfs_client *clp);
298  extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
299  extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
300  extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
301  extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
302  extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
303  				  struct nfs4_fs_locations *, struct page *);
304  extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
305  		struct page *page, const struct cred *);
306  extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
307  extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
308  						    struct dentry *,
309  						    struct nfs_fh *,
310  						    struct nfs_fattr *);
311  extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
312  extern const struct xattr_handler *nfs4_xattr_handlers[];
313  extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
314  		const struct nfs_open_context *ctx,
315  		const struct nfs_lock_context *l_ctx,
316  		fmode_t fmode);
317  extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
318  			     struct nfs_fattr *fattr, struct nfs4_label *label,
319  			     struct inode *inode);
320  extern int update_open_stateid(struct nfs4_state *state,
321  				const nfs4_stateid *open_stateid,
322  				const nfs4_stateid *deleg_stateid,
323  				fmode_t fmode);
324  
325  extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
326  		struct nfs_fsinfo *fsinfo);
327  #if defined(CONFIG_NFS_V4_1)
328  extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
329  extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
330  extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
331  extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
332  				  bool sync);
333  extern int nfs4_detect_session_trunking(struct nfs_client *clp,
334  		struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
335  
336  static inline bool
337  is_ds_only_client(struct nfs_client *clp)
338  {
339  	return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
340  		EXCHGID4_FLAG_USE_PNFS_DS;
341  }
342  
343  static inline bool
344  is_ds_client(struct nfs_client *clp)
345  {
346  	return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
347  }
348  
349  static inline bool
350  _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
351  		    struct rpc_clnt **clntp, struct rpc_message *msg)
352  {
353  	rpc_authflavor_t flavor;
354  
355  	if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
356  	    sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
357  		/* Using machine creds for cleanup operations
358  		 * is only relevent if the client credentials
359  		 * might expire. So don't bother for
360  		 * RPC_AUTH_UNIX.  If file was only exported to
361  		 * sec=sys, the PUTFH would fail anyway.
362  		 */
363  		if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
364  			return false;
365  	}
366  	if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
367  		msg->rpc_cred = rpc_machine_cred();
368  
369  		flavor = clp->cl_rpcclient->cl_auth->au_flavor;
370  		WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
371  			     flavor != RPC_AUTH_GSS_KRB5P);
372  		*clntp = clp->cl_rpcclient;
373  
374  		return true;
375  	}
376  	return false;
377  }
378  
379  /*
380   * Function responsible for determining if an rpc_message should use the
381   * machine cred under SP4_MACH_CRED and if so switching the credential and
382   * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
383   * Should be called before rpc_call_sync/rpc_call_async.
384   */
385  static inline void
386  nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
387  		   struct rpc_clnt **clntp, struct rpc_message *msg)
388  {
389  	_nfs4_state_protect(clp, sp4_mode, clntp, msg);
390  }
391  
392  /*
393   * Special wrapper to nfs4_state_protect for write.
394   * If WRITE can use machine cred but COMMIT cannot, make sure all writes
395   * that use machine cred use NFS_FILE_SYNC.
396   */
397  static inline void
398  nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
399  			 struct rpc_message *msg, struct nfs_pgio_header *hdr)
400  {
401  	if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
402  	    !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
403  		hdr->args.stable = NFS_FILE_SYNC;
404  }
405  #else /* CONFIG_NFS_v4_1 */
406  static inline bool
407  is_ds_only_client(struct nfs_client *clp)
408  {
409  	return false;
410  }
411  
412  static inline bool
413  is_ds_client(struct nfs_client *clp)
414  {
415  	return false;
416  }
417  
418  static inline void
419  nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
420  		   struct rpc_clnt **clntp, struct rpc_message *msg)
421  {
422  }
423  
424  static inline void
425  nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
426  			 struct rpc_message *msg, struct nfs_pgio_header *hdr)
427  {
428  }
429  #endif /* CONFIG_NFS_V4_1 */
430  
431  extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
432  
433  extern const u32 nfs4_fattr_bitmap[3];
434  extern const u32 nfs4_statfs_bitmap[3];
435  extern const u32 nfs4_pathconf_bitmap[3];
436  extern const u32 nfs4_fsinfo_bitmap[3];
437  extern const u32 nfs4_fs_locations_bitmap[3];
438  
439  void nfs40_shutdown_client(struct nfs_client *);
440  void nfs41_shutdown_client(struct nfs_client *);
441  int nfs40_init_client(struct nfs_client *);
442  int nfs41_init_client(struct nfs_client *);
443  void nfs4_free_client(struct nfs_client *);
444  
445  struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
446  
447  /* nfs4renewd.c */
448  extern void nfs4_schedule_state_renewal(struct nfs_client *);
449  extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
450  extern void nfs4_kill_renewd(struct nfs_client *);
451  extern void nfs4_renew_state(struct work_struct *);
452  extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
453  
454  
455  /* nfs4state.c */
456  extern const nfs4_stateid current_stateid;
457  
458  const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
459  const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
460  const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
461  int nfs4_discover_server_trunking(struct nfs_client *clp,
462  			struct nfs_client **);
463  int nfs40_discover_server_trunking(struct nfs_client *clp,
464  			struct nfs_client **, const struct cred *);
465  #if defined(CONFIG_NFS_V4_1)
466  int nfs41_discover_server_trunking(struct nfs_client *clp,
467  			struct nfs_client **, const struct cred *);
468  extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
469  extern void nfs41_notify_server(struct nfs_client *);
470  bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
471  			struct nfs41_server_owner *o2);
472  #else
473  static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
474  {
475  }
476  #endif /* CONFIG_NFS_V4_1 */
477  
478  extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
479  extern void nfs4_put_state_owner(struct nfs4_state_owner *);
480  extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
481  extern void nfs4_free_state_owners(struct list_head *head);
482  extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
483  extern void nfs4_put_open_state(struct nfs4_state *);
484  extern void nfs4_close_state(struct nfs4_state *, fmode_t);
485  extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
486  extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
487  extern void nfs_inode_find_state_and_recover(struct inode *inode,
488  		const nfs4_stateid *stateid);
489  extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
490  extern void nfs4_schedule_lease_recovery(struct nfs_client *);
491  extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
492  extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
493  extern void nfs4_schedule_state_manager(struct nfs_client *);
494  extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
495  extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
496  extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
497  extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
498  extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
499  extern void nfs41_handle_server_scope(struct nfs_client *,
500  				      struct nfs41_server_scope **);
501  extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
502  extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
503  extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
504  		const struct nfs_lock_context *, nfs4_stateid *,
505  		const struct cred **);
506  extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
507  		struct nfs4_state *state);
508  
509  extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
510  extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
511  extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
512  extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
513  extern void nfs_release_seqid(struct nfs_seqid *seqid);
514  extern void nfs_free_seqid(struct nfs_seqid *seqid);
515  extern int nfs4_setup_sequence(struct nfs_client *client,
516  				struct nfs4_sequence_args *args,
517  				struct nfs4_sequence_res *res,
518  				struct rpc_task *task);
519  extern int nfs4_sequence_done(struct rpc_task *task,
520  			      struct nfs4_sequence_res *res);
521  
522  extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
523  extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
524  extern const nfs4_stateid zero_stateid;
525  extern const nfs4_stateid invalid_stateid;
526  
527  /* nfs4super.c */
528  struct nfs_mount_info;
529  extern struct nfs_subversion nfs_v4;
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;
535  
536  #define NFS4_CLIENT_ID_UNIQ_LEN		(64)
537  extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
538  
539  extern int nfs4_try_get_tree(struct fs_context *);
540  extern int nfs4_get_referral_tree(struct fs_context *);
541  
542  /* nfs4sysctl.c */
543  #ifdef CONFIG_SYSCTL
544  int nfs4_register_sysctl(void);
545  void nfs4_unregister_sysctl(void);
546  #else
547  static inline int nfs4_register_sysctl(void)
548  {
549  	return 0;
550  }
551  
552  static inline void nfs4_unregister_sysctl(void)
553  {
554  }
555  #endif
556  
557  /* nfs4xdr.c */
558  extern const struct rpc_procinfo nfs4_procedures[];
559  
560  struct nfs4_mount_data;
561  
562  /* callback_xdr.c */
563  extern const struct svc_version nfs4_callback_version1;
564  extern const struct svc_version nfs4_callback_version4;
565  
566  static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
567  {
568  	memcpy(dst->data, src->data, sizeof(dst->data));
569  	dst->type = src->type;
570  }
571  
572  static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
573  {
574  	if (dst->type != src->type)
575  		return false;
576  	return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
577  }
578  
579  static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
580  {
581  	return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
582  }
583  
584  static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
585  {
586  	return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
587  }
588  
589  static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
590  {
591  	return nfs4_stateid_match_other(dst, src) &&
592  		!(src->seqid && nfs4_stateid_is_newer(dst, src));
593  }
594  
595  static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
596  {
597  	u32 seqid = be32_to_cpu(s1->seqid);
598  
599  	if (++seqid == 0)
600  		++seqid;
601  	s1->seqid = cpu_to_be32(seqid);
602  }
603  
604  static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
605  {
606  	return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
607  }
608  
609  static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
610  		const nfs4_stateid *stateid)
611  {
612  	return test_bit(NFS_OPEN_STATE, &state->flags) &&
613  		nfs4_stateid_match_other(&state->open_stateid, stateid);
614  }
615  
616  #else
617  
618  #define nfs4_close_state(a, b) do { } while (0)
619  #define nfs4_close_sync(a, b) do { } while (0)
620  #define nfs4_state_protect(a, b, c, d) do { } while (0)
621  #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
622  
623  #endif /* CONFIG_NFS_V4 */
624  #endif /* __LINUX_FS_NFS_NFS4_FS.H */
625