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_MANAGER_AVAILABLE,
46 NFS4CLNT_RECALL_RUNNING,
47 NFS4CLNT_RECALL_ANY_LAYOUT_READ,
48 NFS4CLNT_RECALL_ANY_LAYOUT_RW,
49 NFS4CLNT_DELEGRETURN_DELAYED,
50 };
51
52 #define NFS4_RENEW_TIMEOUT 0x01
53 #define NFS4_RENEW_DELEGATION_CB 0x02
54
55 struct nfs_seqid_counter;
56 struct nfs4_minor_version_ops {
57 u32 minor_version;
58 unsigned init_caps;
59
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 *,
65 struct nfs_fsinfo *);
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 *);
70 struct nfs_seqid *
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;
79 };
80
81 #define NFS_SEQID_CONFIRMED 1
82 struct nfs_seqid_counter {
83 ktime_t create_time;
84 int owner_id;
85 int flags;
86 u32 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 */
90 };
91
92 struct nfs_seqid {
93 struct nfs_seqid_counter *sequence;
94 struct list_head list;
95 struct rpc_task *task;
96 };
97
nfs_confirm_seqid(struct nfs_seqid_counter * seqid,int status)98 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
99 {
100 if (seqid_mutating_err(-status))
101 seqid->flags |= NFS_SEQID_CONFIRMED;
102 }
103
104 /*
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.
108 */
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;
114
115 const struct cred *so_cred; /* Associated cred */
116
117 spinlock_t so_lock;
118 atomic_t so_count;
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;
124 };
125
126 enum {
127 NFS_OWNER_RECLAIM_REBOOT,
128 NFS_OWNER_RECLAIM_NOGRACE
129 };
130
131 #define NFS_LOCK_NEW 0
132 #define NFS_LOCK_RECLAIM 1
133 #define NFS_LOCK_EXPIRED 2
134
135 /*
136 * struct nfs4_state maintains the client-side state for a given
137 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
138 *
139 * OPEN:
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.
143 *
144 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
145 */
146
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;
155 refcount_t ls_count;
156 fl_owner_t ls_owner;
157 };
158
159 /* bits for nfs4_state->flags */
160 enum {
161 LK_STATE_IN_USE,
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 */
176 };
177
178 struct nfs4_state {
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 */
182
183 struct nfs4_state_owner *owner; /* Pointer to the open owner */
184 struct inode *inode; /* Pointer to the inode */
185
186 unsigned long flags; /* Do we hold any locks? */
187 spinlock_t state_lock; /* Protects the lock_states list */
188
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 */
192
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) */
198 refcount_t count;
199
200 wait_queue_head_t waitq;
201 struct rcu_head rcu_head;
202 };
203
204
205 struct nfs4_exception {
206 struct nfs4_state *state;
207 struct inode *inode;
208 nfs4_stateid *stateid;
209 long timeout;
210 unsigned char task_is_privileged : 1;
211 unsigned char delay : 1,
212 recovering : 1,
213 retry : 1;
214 bool interruptible;
215 };
216
217 struct nfs4_state_recovery_ops {
218 int owner_flag_bit;
219 int state_flag_bit;
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 *);
226 };
227
228 struct nfs4_opendata {
229 struct kref kref;
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;
239 struct dentry *dir;
240 struct dentry *dentry;
241 struct nfs4_state_owner *owner;
242 struct nfs4_state *state;
243 struct iattr attrs;
244 struct nfs4_layoutget *lgp;
245 unsigned long timestamp;
246 bool rpc_done;
247 bool file_created;
248 bool is_recover;
249 bool cancelled;
250 int rpc_status;
251 };
252
253 struct nfs4_add_xprt_data {
254 struct nfs_client *clp;
255 const struct cred *cred;
256 };
257
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 *);
262 };
263
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 *);
268 };
269
270 extern const struct dentry_operations nfs4_dentry_operations;
271
272 /* dir.c */
273 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
274 unsigned, umode_t);
275
276 /* fs_context.c */
277 extern struct file_system_type nfs4_fs_type;
278
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);
287 /* nfs4proc.c */
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 *,
312 struct dentry *,
313 struct nfs_fh *,
314 struct nfs_fattr *);
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,
320 fmode_t fmode);
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,
327 fmode_t fmode);
328
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);
337
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,
343 bool sync);
344 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
345 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
346
347 static inline bool
is_ds_only_client(struct nfs_client * clp)348 is_ds_only_client(struct nfs_client *clp)
349 {
350 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
351 EXCHGID4_FLAG_USE_PNFS_DS;
352 }
353
354 static inline bool
is_ds_client(struct nfs_client * clp)355 is_ds_client(struct nfs_client *clp)
356 {
357 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
358 }
359
360 static inline bool
_nfs4_state_protect(struct nfs_client * clp,unsigned long sp4_mode,struct rpc_clnt ** clntp,struct rpc_message * msg)361 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
362 struct rpc_clnt **clntp, struct rpc_message *msg)
363 {
364 rpc_authflavor_t flavor;
365
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.
373 */
374 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
375 return false;
376 }
377 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
378 msg->rpc_cred = rpc_machine_cred();
379
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;
384
385 return true;
386 }
387 return false;
388 }
389
390 /*
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.
395 */
396 static inline void
nfs4_state_protect(struct nfs_client * clp,unsigned long sp4_mode,struct rpc_clnt ** clntp,struct rpc_message * msg)397 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
398 struct rpc_clnt **clntp, struct rpc_message *msg)
399 {
400 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
401 }
402
403 /*
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.
407 */
408 static inline void
nfs4_state_protect_write(struct nfs_client * clp,struct rpc_clnt ** clntp,struct rpc_message * msg,struct nfs_pgio_header * hdr)409 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
410 struct rpc_message *msg, struct nfs_pgio_header *hdr)
411 {
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;
415 }
416 #else /* CONFIG_NFS_v4_1 */
417 static inline bool
is_ds_only_client(struct nfs_client * clp)418 is_ds_only_client(struct nfs_client *clp)
419 {
420 return false;
421 }
422
423 static inline bool
is_ds_client(struct nfs_client * clp)424 is_ds_client(struct nfs_client *clp)
425 {
426 return false;
427 }
428
429 static inline void
nfs4_state_protect(struct nfs_client * clp,unsigned long sp4_flags,struct rpc_clnt ** clntp,struct rpc_message * msg)430 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
431 struct rpc_clnt **clntp, struct rpc_message *msg)
432 {
433 }
434
435 static inline void
nfs4_state_protect_write(struct nfs_client * clp,struct rpc_clnt ** clntp,struct rpc_message * msg,struct nfs_pgio_header * hdr)436 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
437 struct rpc_message *msg, struct nfs_pgio_header *hdr)
438 {
439 }
440 #endif /* CONFIG_NFS_V4_1 */
441
442 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
443
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];
449
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 *);
455
456 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
457
458 /* nfs4renewd.c */
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);
464
465
466 /* nfs4state.c */
467 extern const nfs4_stateid current_stateid;
468
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);
483 #else
nfs4_schedule_session_recovery(struct nfs4_session * session,int err)484 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
485 {
486 }
487 #endif /* CONFIG_NFS_V4_1 */
488
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);
519
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);
532
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;
537
538 /* nfs4super.c */
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;
546
547 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
548 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
549
550 extern int nfs4_try_get_tree(struct fs_context *);
551 extern int nfs4_get_referral_tree(struct fs_context *);
552
553 /* nfs4sysctl.c */
554 #ifdef CONFIG_SYSCTL
555 int nfs4_register_sysctl(void);
556 void nfs4_unregister_sysctl(void);
557 #else
nfs4_register_sysctl(void)558 static inline int nfs4_register_sysctl(void)
559 {
560 return 0;
561 }
562
nfs4_unregister_sysctl(void)563 static inline void nfs4_unregister_sysctl(void)
564 {
565 }
566 #endif
567
568 /* nfs4xdr.c */
569 extern const struct rpc_procinfo nfs4_procedures[];
570
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;
575 #endif
576
577 struct nfs4_mount_data;
578
579 /* callback_xdr.c */
580 extern const struct svc_version nfs4_callback_version1;
581 extern const struct svc_version nfs4_callback_version4;
582
nfs4_stateid_copy(nfs4_stateid * dst,const nfs4_stateid * src)583 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
584 {
585 memcpy(dst->data, src->data, sizeof(dst->data));
586 dst->type = src->type;
587 }
588
nfs4_stateid_match(const nfs4_stateid * dst,const nfs4_stateid * src)589 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
590 {
591 if (dst->type != src->type)
592 return false;
593 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
594 }
595
nfs4_stateid_match_other(const nfs4_stateid * dst,const nfs4_stateid * src)596 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
597 {
598 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
599 }
600
nfs4_stateid_is_newer(const nfs4_stateid * s1,const nfs4_stateid * s2)601 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
602 {
603 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
604 }
605
nfs4_stateid_is_next(const nfs4_stateid * s1,const nfs4_stateid * s2)606 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
607 {
608 u32 seq1 = be32_to_cpu(s1->seqid);
609 u32 seq2 = be32_to_cpu(s2->seqid);
610
611 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
612 }
613
nfs4_stateid_match_or_older(const nfs4_stateid * dst,const nfs4_stateid * src)614 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
615 {
616 return nfs4_stateid_match_other(dst, src) &&
617 !(src->seqid && nfs4_stateid_is_newer(dst, src));
618 }
619
nfs4_stateid_seqid_inc(nfs4_stateid * s1)620 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
621 {
622 u32 seqid = be32_to_cpu(s1->seqid);
623
624 if (++seqid == 0)
625 ++seqid;
626 s1->seqid = cpu_to_be32(seqid);
627 }
628
nfs4_valid_open_stateid(const struct nfs4_state * state)629 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
630 {
631 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
632 }
633
nfs4_state_match_open_stateid_other(const struct nfs4_state * state,const nfs4_stateid * stateid)634 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
635 const nfs4_stateid *stateid)
636 {
637 return test_bit(NFS_OPEN_STATE, &state->flags) &&
638 nfs4_stateid_match_other(&state->open_stateid, stateid);
639 }
640
641 /* nfs42xattr.c */
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,
647 ssize_t buflen);
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,
652 ssize_t buflen);
653 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
654 ssize_t buflen);
655 extern void nfs4_xattr_cache_zap(struct inode *inode);
656 #else
nfs4_xattr_cache_zap(struct inode * inode)657 static inline void nfs4_xattr_cache_zap(struct inode *inode)
658 {
659 }
660 #endif /* CONFIG_NFS_V4_2 */
661
662 #else /* CONFIG_NFS_V4 */
663
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)
668
669
670 #endif /* CONFIG_NFS_V4 */
671 #endif /* __LINUX_FS_NFS_NFS4_FS.H */
672