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_DELEGRETURN_RUNNING,
46 };
47
48 #define NFS4_RENEW_TIMEOUT 0x01
49 #define NFS4_RENEW_DELEGATION_CB 0x02
50
51 struct nfs_seqid_counter;
52 struct nfs4_minor_version_ops {
53 u32 minor_version;
54 unsigned init_caps;
55
56 int (*init_client)(struct nfs_client *);
57 void (*shutdown_client)(struct nfs_client *);
58 bool (*match_stateid)(const nfs4_stateid *,
59 const nfs4_stateid *);
60 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
61 struct nfs_fsinfo *);
62 void (*free_lock_state)(struct nfs_server *,
63 struct nfs4_lock_state *);
64 int (*test_and_free_expired)(struct nfs_server *,
65 nfs4_stateid *, struct rpc_cred *);
66 struct nfs_seqid *
67 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
68 int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
69 const struct rpc_call_ops *call_sync_ops;
70 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
71 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
72 const struct nfs4_state_maintenance_ops *state_renewal_ops;
73 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
74 };
75
76 #define NFS_SEQID_CONFIRMED 1
77 struct nfs_seqid_counter {
78 ktime_t create_time;
79 int owner_id;
80 int flags;
81 u32 counter;
82 spinlock_t lock; /* Protects the list */
83 struct list_head list; /* Defines sequence of RPC calls */
84 struct rpc_wait_queue wait; /* RPC call delay queue */
85 };
86
87 struct nfs_seqid {
88 struct nfs_seqid_counter *sequence;
89 struct list_head list;
90 struct rpc_task *task;
91 };
92
nfs_confirm_seqid(struct nfs_seqid_counter * seqid,int status)93 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
94 {
95 if (seqid_mutating_err(-status))
96 seqid->flags |= NFS_SEQID_CONFIRMED;
97 }
98
99 /*
100 * NFS4 state_owners and lock_owners are simply labels for ordered
101 * sequences of RPC calls. Their sole purpose is to provide once-only
102 * semantics by allowing the server to identify replayed requests.
103 */
104 struct nfs4_state_owner {
105 struct nfs_server *so_server;
106 struct list_head so_lru;
107 unsigned long so_expires;
108 struct rb_node so_server_node;
109
110 struct rpc_cred *so_cred; /* Associated cred */
111
112 spinlock_t so_lock;
113 atomic_t so_count;
114 unsigned long so_flags;
115 struct list_head so_states;
116 struct nfs_seqid_counter so_seqid;
117 seqcount_t so_reclaim_seqcount;
118 struct mutex so_delegreturn_mutex;
119 };
120
121 enum {
122 NFS_OWNER_RECLAIM_REBOOT,
123 NFS_OWNER_RECLAIM_NOGRACE
124 };
125
126 #define NFS_LOCK_NEW 0
127 #define NFS_LOCK_RECLAIM 1
128 #define NFS_LOCK_EXPIRED 2
129
130 /*
131 * struct nfs4_state maintains the client-side state for a given
132 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
133 *
134 * OPEN:
135 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
136 * we need to know how many files are open for reading or writing on a
137 * given inode. This information too is stored here.
138 *
139 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
140 */
141
142 struct nfs4_lock_state {
143 struct list_head ls_locks; /* Other lock stateids */
144 struct nfs4_state * ls_state; /* Pointer to open state */
145 #define NFS_LOCK_INITIALIZED 0
146 #define NFS_LOCK_LOST 1
147 unsigned long ls_flags;
148 struct nfs_seqid_counter ls_seqid;
149 nfs4_stateid ls_stateid;
150 refcount_t ls_count;
151 fl_owner_t ls_owner;
152 };
153
154 /* bits for nfs4_state->flags */
155 enum {
156 LK_STATE_IN_USE,
157 NFS_DELEGATED_STATE, /* Current stateid is delegation */
158 NFS_OPEN_STATE, /* OPEN stateid is set */
159 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
160 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
161 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
162 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
163 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
164 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
165 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
166 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
167 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
168 #ifdef CONFIG_NFS_V4_2
169 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
170 #endif /* CONFIG_NFS_V4_2 */
171 };
172
173 struct nfs4_state {
174 struct list_head open_states; /* List of states for the same state_owner */
175 struct list_head inode_states; /* List of states for the same inode */
176 struct list_head lock_states; /* List of subservient lock stateids */
177
178 struct nfs4_state_owner *owner; /* Pointer to the open owner */
179 struct inode *inode; /* Pointer to the inode */
180
181 unsigned long flags; /* Do we hold any locks? */
182 spinlock_t state_lock; /* Protects the lock_states list */
183
184 seqlock_t seqlock; /* Protects the stateid/open_stateid */
185 nfs4_stateid stateid; /* Current stateid: may be delegation */
186 nfs4_stateid open_stateid; /* OPEN stateid */
187
188 /* The following 3 fields are protected by owner->so_lock */
189 unsigned int n_rdonly; /* Number of read-only references */
190 unsigned int n_wronly; /* Number of write-only references */
191 unsigned int n_rdwr; /* Number of read/write references */
192 fmode_t state; /* State on the server (R,W, or RW) */
193 refcount_t count;
194
195 wait_queue_head_t waitq;
196 };
197
198
199 struct nfs4_exception {
200 struct nfs4_state *state;
201 struct inode *inode;
202 nfs4_stateid *stateid;
203 long timeout;
204 unsigned char task_is_privileged : 1;
205 unsigned char delay : 1,
206 recovering : 1,
207 retry : 1;
208 };
209
210 struct nfs4_state_recovery_ops {
211 int owner_flag_bit;
212 int state_flag_bit;
213 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
214 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
215 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
216 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
217 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
218 struct rpc_cred *);
219 };
220
221 struct nfs4_opendata {
222 struct kref kref;
223 struct nfs_openargs o_arg;
224 struct nfs_openres o_res;
225 struct nfs_open_confirmargs c_arg;
226 struct nfs_open_confirmres c_res;
227 struct nfs4_string owner_name;
228 struct nfs4_string group_name;
229 struct nfs4_label *a_label;
230 struct nfs_fattr f_attr;
231 struct nfs4_label *f_label;
232 struct dentry *dir;
233 struct dentry *dentry;
234 struct nfs4_state_owner *owner;
235 struct nfs4_state *state;
236 struct iattr attrs;
237 struct nfs4_layoutget *lgp;
238 unsigned long timestamp;
239 bool rpc_done;
240 bool file_created;
241 bool is_recover;
242 bool cancelled;
243 int rpc_status;
244 };
245
246 struct nfs4_add_xprt_data {
247 struct nfs_client *clp;
248 struct rpc_cred *cred;
249 };
250
251 struct nfs4_state_maintenance_ops {
252 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
253 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
254 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
255 };
256
257 struct nfs4_mig_recovery_ops {
258 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
259 struct page *, struct rpc_cred *);
260 int (*fsid_present)(struct inode *, struct rpc_cred *);
261 };
262
263 extern const struct dentry_operations nfs4_dentry_operations;
264
265 /* dir.c */
266 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
267 unsigned, umode_t);
268
269 /* super.c */
270 extern struct file_system_type nfs4_fs_type;
271
272 /* nfs4namespace.c */
273 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
274 const struct qstr *);
275 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
276 struct nfs_fh *, struct nfs_fattr *);
277 int nfs4_replace_transport(struct nfs_server *server,
278 const struct nfs4_fs_locations *locations);
279 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr *sa,
280 size_t salen, struct net *net);
281 /* nfs4proc.c */
282 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
283 extern int nfs4_async_handle_error(struct rpc_task *task,
284 struct nfs_server *server,
285 struct nfs4_state *state, long *timeout);
286 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
287 struct rpc_message *, struct nfs4_sequence_args *,
288 struct nfs4_sequence_res *, int);
289 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
290 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
291 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
292 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
293 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
294 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
295 extern int nfs4_destroy_clientid(struct nfs_client *clp);
296 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
297 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
298 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
299 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
300 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
301 struct nfs4_fs_locations *, struct page *);
302 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
303 struct page *page, struct rpc_cred *);
304 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
305 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
306 struct nfs_fh *, struct nfs_fattr *);
307 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
308 extern const struct xattr_handler *nfs4_xattr_handlers[];
309 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
310 const struct nfs_open_context *ctx,
311 const struct nfs_lock_context *l_ctx,
312 fmode_t fmode);
313
314 #if defined(CONFIG_NFS_V4_1)
315 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
316 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
317 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
318 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
319 struct nfs_fsinfo *fsinfo);
320 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
321 bool sync);
322 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
323 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
324
325 static inline bool
is_ds_only_client(struct nfs_client * clp)326 is_ds_only_client(struct nfs_client *clp)
327 {
328 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
329 EXCHGID4_FLAG_USE_PNFS_DS;
330 }
331
332 static inline bool
is_ds_client(struct nfs_client * clp)333 is_ds_client(struct nfs_client *clp)
334 {
335 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
336 }
337
338 static inline bool
_nfs4_state_protect(struct nfs_client * clp,unsigned long sp4_mode,struct rpc_clnt ** clntp,struct rpc_message * msg)339 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
340 struct rpc_clnt **clntp, struct rpc_message *msg)
341 {
342 struct rpc_cred *newcred = NULL;
343 rpc_authflavor_t flavor;
344
345 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
346 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
347 /* Using machine creds for cleanup operations
348 * is only relevent if the client credentials
349 * might expire. So don't bother for
350 * RPC_AUTH_UNIX. If file was only exported to
351 * sec=sys, the PUTFH would fail anyway.
352 */
353 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
354 return false;
355 }
356 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
357 spin_lock(&clp->cl_lock);
358 if (clp->cl_machine_cred != NULL)
359 /* don't call get_rpccred on the machine cred -
360 * a reference will be held for life of clp */
361 newcred = clp->cl_machine_cred;
362 spin_unlock(&clp->cl_lock);
363 msg->rpc_cred = newcred;
364
365 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
366 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
367 flavor != RPC_AUTH_GSS_KRB5P);
368 *clntp = clp->cl_rpcclient;
369
370 return true;
371 }
372 return false;
373 }
374
375 /*
376 * Function responsible for determining if an rpc_message should use the
377 * machine cred under SP4_MACH_CRED and if so switching the credential and
378 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
379 * Should be called before rpc_call_sync/rpc_call_async.
380 */
381 static inline void
nfs4_state_protect(struct nfs_client * clp,unsigned long sp4_mode,struct rpc_clnt ** clntp,struct rpc_message * msg)382 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
383 struct rpc_clnt **clntp, struct rpc_message *msg)
384 {
385 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
386 }
387
388 /*
389 * Special wrapper to nfs4_state_protect for write.
390 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
391 * that use machine cred use NFS_FILE_SYNC.
392 */
393 static inline void
nfs4_state_protect_write(struct nfs_client * clp,struct rpc_clnt ** clntp,struct rpc_message * msg,struct nfs_pgio_header * hdr)394 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
395 struct rpc_message *msg, struct nfs_pgio_header *hdr)
396 {
397 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
398 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
399 hdr->args.stable = NFS_FILE_SYNC;
400 }
401 #else /* CONFIG_NFS_v4_1 */
402 static inline bool
is_ds_only_client(struct nfs_client * clp)403 is_ds_only_client(struct nfs_client *clp)
404 {
405 return false;
406 }
407
408 static inline bool
is_ds_client(struct nfs_client * clp)409 is_ds_client(struct nfs_client *clp)
410 {
411 return false;
412 }
413
414 static inline void
nfs4_state_protect(struct nfs_client * clp,unsigned long sp4_flags,struct rpc_clnt ** clntp,struct rpc_message * msg)415 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
416 struct rpc_clnt **clntp, struct rpc_message *msg)
417 {
418 }
419
420 static inline void
nfs4_state_protect_write(struct nfs_client * clp,struct rpc_clnt ** clntp,struct rpc_message * msg,struct nfs_pgio_header * hdr)421 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
422 struct rpc_message *msg, struct nfs_pgio_header *hdr)
423 {
424 }
425 #endif /* CONFIG_NFS_V4_1 */
426
427 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
428
429 extern const u32 nfs4_fattr_bitmap[3];
430 extern const u32 nfs4_statfs_bitmap[3];
431 extern const u32 nfs4_pathconf_bitmap[3];
432 extern const u32 nfs4_fsinfo_bitmap[3];
433 extern const u32 nfs4_fs_locations_bitmap[3];
434
435 void nfs40_shutdown_client(struct nfs_client *);
436 void nfs41_shutdown_client(struct nfs_client *);
437 int nfs40_init_client(struct nfs_client *);
438 int nfs41_init_client(struct nfs_client *);
439 void nfs4_free_client(struct nfs_client *);
440
441 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
442
443 /* nfs4renewd.c */
444 extern void nfs4_schedule_state_renewal(struct nfs_client *);
445 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
446 extern void nfs4_kill_renewd(struct nfs_client *);
447 extern void nfs4_renew_state(struct work_struct *);
448 extern void nfs4_set_lease_period(struct nfs_client *clp,
449 unsigned long lease,
450 unsigned long lastrenewed);
451
452
453 /* nfs4state.c */
454 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
455 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
456 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
457 int nfs4_discover_server_trunking(struct nfs_client *clp,
458 struct nfs_client **);
459 int nfs40_discover_server_trunking(struct nfs_client *clp,
460 struct nfs_client **, struct rpc_cred *);
461 #if defined(CONFIG_NFS_V4_1)
462 int nfs41_discover_server_trunking(struct nfs_client *clp,
463 struct nfs_client **, struct rpc_cred *);
464 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
465 extern void nfs41_notify_server(struct nfs_client *);
466 #else
nfs4_schedule_session_recovery(struct nfs4_session * session,int err)467 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
468 {
469 }
470 #endif /* CONFIG_NFS_V4_1 */
471
472 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
473 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
474 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
475 extern void nfs4_free_state_owners(struct list_head *head);
476 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
477 extern void nfs4_put_open_state(struct nfs4_state *);
478 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
479 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
480 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
481 extern void nfs_inode_find_state_and_recover(struct inode *inode,
482 const nfs4_stateid *stateid);
483 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
484 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
485 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
486 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
487 extern void nfs4_schedule_state_manager(struct nfs_client *);
488 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
489 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
490 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
491 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
492 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
493 extern void nfs41_handle_server_scope(struct nfs_client *,
494 struct nfs41_server_scope **);
495 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
496 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
497 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
498 const struct nfs_lock_context *, nfs4_stateid *,
499 struct rpc_cred **);
500 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
501 struct nfs4_state *state);
502 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
503 struct nfs4_state *state);
504
505 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
506 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
507 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
508 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
509 extern void nfs_release_seqid(struct nfs_seqid *seqid);
510 extern void nfs_free_seqid(struct nfs_seqid *seqid);
511 extern int nfs4_setup_sequence(struct nfs_client *client,
512 struct nfs4_sequence_args *args,
513 struct nfs4_sequence_res *res,
514 struct rpc_task *task);
515 extern int nfs4_sequence_done(struct rpc_task *task,
516 struct nfs4_sequence_res *res);
517
518 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
519 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
520 extern const nfs4_stateid zero_stateid;
521 extern const nfs4_stateid invalid_stateid;
522
523 /* nfs4super.c */
524 struct nfs_mount_info;
525 extern struct nfs_subversion nfs_v4;
526 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
527 extern bool nfs4_disable_idmapping;
528 extern unsigned short max_session_slots;
529 extern unsigned short max_session_cb_slots;
530 extern unsigned short send_implementation_id;
531 extern bool recover_lost_locks;
532
533 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
534 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
535
536 /* nfs4sysctl.c */
537 #ifdef CONFIG_SYSCTL
538 int nfs4_register_sysctl(void);
539 void nfs4_unregister_sysctl(void);
540 #else
nfs4_register_sysctl(void)541 static inline int nfs4_register_sysctl(void)
542 {
543 return 0;
544 }
545
nfs4_unregister_sysctl(void)546 static inline void nfs4_unregister_sysctl(void)
547 {
548 }
549 #endif
550
551 /* nfs4xdr.c */
552 extern const struct rpc_procinfo nfs4_procedures[];
553
554 struct nfs4_mount_data;
555
556 /* callback_xdr.c */
557 extern const struct svc_version nfs4_callback_version1;
558 extern const struct svc_version nfs4_callback_version4;
559
nfs4_stateid_copy(nfs4_stateid * dst,const nfs4_stateid * src)560 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
561 {
562 memcpy(dst->data, src->data, sizeof(dst->data));
563 dst->type = src->type;
564 }
565
nfs4_stateid_match(const nfs4_stateid * dst,const nfs4_stateid * src)566 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
567 {
568 if (dst->type != src->type)
569 return false;
570 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
571 }
572
nfs4_stateid_match_other(const nfs4_stateid * dst,const nfs4_stateid * src)573 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
574 {
575 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
576 }
577
nfs4_stateid_is_newer(const nfs4_stateid * s1,const nfs4_stateid * s2)578 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
579 {
580 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
581 }
582
nfs4_valid_open_stateid(const struct nfs4_state * state)583 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
584 {
585 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
586 }
587
nfs4_state_match_open_stateid_other(const struct nfs4_state * state,const nfs4_stateid * stateid)588 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
589 const nfs4_stateid *stateid)
590 {
591 return test_bit(NFS_OPEN_STATE, &state->flags) &&
592 nfs4_stateid_match_other(&state->open_stateid, stateid);
593 }
594
595 #else
596
597 #define nfs4_close_state(a, b) do { } while (0)
598 #define nfs4_close_sync(a, b) do { } while (0)
599 #define nfs4_state_protect(a, b, c, d) do { } while (0)
600 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
601
602 #endif /* CONFIG_NFS_V4 */
603 #endif /* __LINUX_FS_NFS_NFS4_FS.H */
604