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 #include <linux/filelock.h>
27
28 struct idmap;
29
30 enum nfs4_client_state {
31 NFS4CLNT_MANAGER_RUNNING = 0,
32 NFS4CLNT_CHECK_LEASE,
33 NFS4CLNT_LEASE_EXPIRED,
34 NFS4CLNT_RECLAIM_REBOOT,
35 NFS4CLNT_RECLAIM_NOGRACE,
36 NFS4CLNT_DELEGRETURN,
37 NFS4CLNT_SESSION_RESET,
38 NFS4CLNT_LEASE_CONFIRM,
39 NFS4CLNT_SERVER_SCOPE_MISMATCH,
40 NFS4CLNT_PURGE_STATE,
41 NFS4CLNT_BIND_CONN_TO_SESSION,
42 NFS4CLNT_MOVED,
43 NFS4CLNT_LEASE_MOVED,
44 NFS4CLNT_DELEGATION_EXPIRED,
45 NFS4CLNT_RUN_MANAGER,
46 NFS4CLNT_MANAGER_AVAILABLE,
47 NFS4CLNT_RECALL_RUNNING,
48 NFS4CLNT_RECALL_ANY_LAYOUT_READ,
49 NFS4CLNT_RECALL_ANY_LAYOUT_RW,
50 NFS4CLNT_DELEGRETURN_DELAYED,
51 };
52
53 #define NFS4_RENEW_TIMEOUT 0x01
54 #define NFS4_RENEW_DELEGATION_CB 0x02
55
56 struct nfs_seqid_counter;
57 struct nfs4_minor_version_ops {
58 u32 minor_version;
59 unsigned init_caps;
60
61 int (*init_client)(struct nfs_client *);
62 void (*shutdown_client)(struct nfs_client *);
63 bool (*match_stateid)(const nfs4_stateid *,
64 const nfs4_stateid *);
65 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
66 struct nfs_fsinfo *);
67 void (*free_lock_state)(struct nfs_server *,
68 struct nfs4_lock_state *);
69 int (*test_and_free_expired)(struct nfs_server *,
70 nfs4_stateid *, const struct cred *);
71 struct nfs_seqid *
72 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
73 void (*session_trunk)(struct rpc_clnt *clnt,
74 struct rpc_xprt *xprt, void *data);
75 const struct rpc_call_ops *call_sync_ops;
76 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
77 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
78 const struct nfs4_state_maintenance_ops *state_renewal_ops;
79 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
80 };
81
82 #define NFS_SEQID_CONFIRMED 1
83 struct nfs_seqid_counter {
84 ktime_t create_time;
85 int owner_id;
86 int flags;
87 u32 counter;
88 spinlock_t lock; /* Protects the list */
89 struct list_head list; /* Defines sequence of RPC calls */
90 struct rpc_wait_queue wait; /* RPC call delay queue */
91 };
92
93 struct nfs_seqid {
94 struct nfs_seqid_counter *sequence;
95 struct list_head list;
96 struct rpc_task *task;
97 };
98
99 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
100 {
101 if (seqid_mutating_err(-status))
102 seqid->flags |= NFS_SEQID_CONFIRMED;
103 }
104
105 /*
106 * NFS4 state_owners and lock_owners are simply labels for ordered
107 * sequences of RPC calls. Their sole purpose is to provide once-only
108 * semantics by allowing the server to identify replayed requests.
109 */
110 struct nfs4_state_owner {
111 struct nfs_server *so_server;
112 struct list_head so_lru;
113 unsigned long so_expires;
114 struct rb_node so_server_node;
115
116 const struct cred *so_cred; /* Associated cred */
117
118 spinlock_t so_lock;
119 atomic_t so_count;
120 unsigned long so_flags;
121 struct list_head so_states;
122 struct nfs_seqid_counter so_seqid;
123 seqcount_spinlock_t so_reclaim_seqcount;
124 struct mutex so_delegreturn_mutex;
125 };
126
127 enum {
128 NFS_OWNER_RECLAIM_REBOOT,
129 NFS_OWNER_RECLAIM_NOGRACE
130 };
131
132 #define NFS_LOCK_NEW 0
133 #define NFS_LOCK_RECLAIM 1
134 #define NFS_LOCK_EXPIRED 2
135
136 /*
137 * struct nfs4_state maintains the client-side state for a given
138 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
139 *
140 * OPEN:
141 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
142 * we need to know how many files are open for reading or writing on a
143 * given inode. This information too is stored here.
144 *
145 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
146 */
147
148 struct nfs4_lock_state {
149 struct list_head ls_locks; /* Other lock stateids */
150 struct nfs4_state * ls_state; /* Pointer to open state */
151 #define NFS_LOCK_INITIALIZED 0
152 #define NFS_LOCK_LOST 1
153 #define NFS_LOCK_UNLOCKING 2
154 unsigned long ls_flags;
155 struct nfs_seqid_counter ls_seqid;
156 nfs4_stateid ls_stateid;
157 refcount_t ls_count;
158 fl_owner_t ls_owner;
159 };
160
161 /* bits for nfs4_state->flags */
162 enum {
163 LK_STATE_IN_USE,
164 NFS_DELEGATED_STATE, /* Current stateid is delegation */
165 NFS_OPEN_STATE, /* OPEN stateid is set */
166 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
167 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
168 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
169 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
170 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
171 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
172 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
173 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
174 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
175 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
176 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/
177 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */
178 };
179
180 struct nfs4_state {
181 struct list_head open_states; /* List of states for the same state_owner */
182 struct list_head inode_states; /* List of states for the same inode */
183 struct list_head lock_states; /* List of subservient lock stateids */
184
185 struct nfs4_state_owner *owner; /* Pointer to the open owner */
186 struct inode *inode; /* Pointer to the inode */
187
188 unsigned long flags; /* Do we hold any locks? */
189 spinlock_t state_lock; /* Protects the lock_states list */
190
191 seqlock_t seqlock; /* Protects the stateid/open_stateid */
192 nfs4_stateid stateid; /* Current stateid: may be delegation */
193 nfs4_stateid open_stateid; /* OPEN stateid */
194
195 /* The following 3 fields are protected by owner->so_lock */
196 unsigned int n_rdonly; /* Number of read-only references */
197 unsigned int n_wronly; /* Number of write-only references */
198 unsigned int n_rdwr; /* Number of read/write references */
199 fmode_t state; /* State on the server (R,W, or RW) */
200 refcount_t count;
201
202 wait_queue_head_t waitq;
203 struct rcu_head rcu_head;
204 };
205
206
207 struct nfs4_exception {
208 struct nfs4_state *state;
209 struct inode *inode;
210 nfs4_stateid *stateid;
211 long timeout;
212 unsigned char task_is_privileged : 1;
213 unsigned char delay : 1,
214 recovering : 1,
215 retry : 1;
216 bool interruptible;
217 };
218
219 struct nfs4_state_recovery_ops {
220 int owner_flag_bit;
221 int state_flag_bit;
222 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
223 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
224 int (*establish_clid)(struct nfs_client *, const struct cred *);
225 int (*reclaim_complete)(struct nfs_client *, const struct cred *);
226 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
227 const struct cred *);
228 };
229
230 struct nfs4_opendata {
231 struct kref kref;
232 struct nfs_openargs o_arg;
233 struct nfs_openres o_res;
234 struct nfs_open_confirmargs c_arg;
235 struct nfs_open_confirmres c_res;
236 struct nfs4_string owner_name;
237 struct nfs4_string group_name;
238 struct nfs4_label *a_label;
239 struct nfs_fattr f_attr;
240 struct dentry *dir;
241 struct dentry *dentry;
242 struct nfs4_state_owner *owner;
243 struct nfs4_state *state;
244 struct iattr attrs;
245 struct nfs4_layoutget *lgp;
246 unsigned long timestamp;
247 bool rpc_done;
248 bool file_created;
249 bool is_recover;
250 bool cancelled;
251 int rpc_status;
252 };
253
254 struct nfs4_add_xprt_data {
255 struct nfs_client *clp;
256 const struct cred *cred;
257 };
258
259 struct nfs4_state_maintenance_ops {
260 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
261 const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
262 int (*renew_lease)(struct nfs_client *, const struct cred *);
263 };
264
265 struct nfs4_mig_recovery_ops {
266 int (*get_locations)(struct nfs_server *, struct nfs_fh *,
267 struct nfs4_fs_locations *, struct page *, const struct cred *);
268 int (*fsid_present)(struct inode *, const struct cred *);
269 };
270
271 extern const struct dentry_operations nfs4_dentry_operations;
272
273 /* dir.c */
274 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
275 unsigned, umode_t);
276
277 /* fs_context.c */
278 extern struct file_system_type nfs4_fs_type;
279
280 /* nfs4namespace.c */
281 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
282 const struct qstr *);
283 int nfs4_submount(struct fs_context *, struct nfs_server *);
284 int nfs4_replace_transport(struct nfs_server *server,
285 const struct nfs4_fs_locations *locations);
286 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss,
287 size_t salen, struct net *net, int port);
288 /* nfs4proc.c */
289 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
290 extern int nfs4_async_handle_error(struct rpc_task *task,
291 struct nfs_server *server,
292 struct nfs4_state *state, long *timeout);
293 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
294 struct rpc_message *, struct nfs4_sequence_args *,
295 struct nfs4_sequence_res *, int);
296 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
297 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
298 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
299 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
300 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
301 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
302 extern int nfs4_destroy_clientid(struct nfs_client *clp);
303 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
304 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
305 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
306 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
307 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
308 struct nfs4_fs_locations *, struct page *);
309 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
310 struct nfs4_fs_locations *,
311 struct page *page, const struct cred *);
312 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
313 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
314 struct dentry *,
315 struct nfs_fh *,
316 struct nfs_fattr *);
317 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
318 extern const struct xattr_handler *nfs4_xattr_handlers[];
319 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
320 const struct nfs_open_context *ctx,
321 const struct nfs_lock_context *l_ctx,
322 fmode_t fmode);
323 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
324 struct inode *inode, unsigned long cache_validity);
325 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
326 struct nfs_fattr *fattr, struct inode *inode);
327 extern int update_open_stateid(struct nfs4_state *state,
328 const nfs4_stateid *open_stateid,
329 const nfs4_stateid *deleg_stateid,
330 fmode_t fmode);
331 extern int nfs4_proc_setlease(struct file *file, long arg,
332 struct file_lock **lease, void **priv);
333 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
334 struct nfs_fsinfo *fsinfo);
335 extern void nfs4_update_changeattr(struct inode *dir,
336 struct nfs4_change_info *cinfo,
337 unsigned long timestamp,
338 unsigned long cache_validity);
339 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
340 struct page **pages);
341
342 #if defined(CONFIG_NFS_V4_1)
343 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
344 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
345 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
346 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
347 bool sync);
348 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
349 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
350
351 static inline bool
352 is_ds_only_client(struct nfs_client *clp)
353 {
354 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
355 EXCHGID4_FLAG_USE_PNFS_DS;
356 }
357
358 static inline bool
359 is_ds_client(struct nfs_client *clp)
360 {
361 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
362 }
363
364 static inline bool
365 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
366 struct rpc_clnt **clntp, struct rpc_message *msg)
367 {
368 rpc_authflavor_t flavor;
369
370 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
371 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
372 /* Using machine creds for cleanup operations
373 * is only relevent if the client credentials
374 * might expire. So don't bother for
375 * RPC_AUTH_UNIX. If file was only exported to
376 * sec=sys, the PUTFH would fail anyway.
377 */
378 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
379 return false;
380 }
381 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
382 msg->rpc_cred = rpc_machine_cred();
383
384 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
385 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
386 flavor != RPC_AUTH_GSS_KRB5P);
387 *clntp = clp->cl_rpcclient;
388
389 return true;
390 }
391 return false;
392 }
393
394 /*
395 * Function responsible for determining if an rpc_message should use the
396 * machine cred under SP4_MACH_CRED and if so switching the credential and
397 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
398 * Should be called before rpc_call_sync/rpc_call_async.
399 */
400 static inline void
401 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
402 struct rpc_clnt **clntp, struct rpc_message *msg)
403 {
404 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
405 }
406
407 /*
408 * Special wrapper to nfs4_state_protect for write.
409 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
410 * that use machine cred use NFS_FILE_SYNC.
411 */
412 static inline void
413 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
414 struct rpc_message *msg, struct nfs_pgio_header *hdr)
415 {
416 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
417 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
418 hdr->args.stable = NFS_FILE_SYNC;
419 }
420 #else /* CONFIG_NFS_v4_1 */
421 static inline bool
422 is_ds_only_client(struct nfs_client *clp)
423 {
424 return false;
425 }
426
427 static inline bool
428 is_ds_client(struct nfs_client *clp)
429 {
430 return false;
431 }
432
433 static inline void
434 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
435 struct rpc_clnt **clntp, struct rpc_message *msg)
436 {
437 }
438
439 static inline void
440 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
441 struct rpc_message *msg, struct nfs_pgio_header *hdr)
442 {
443 }
444 #endif /* CONFIG_NFS_V4_1 */
445
446 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
447
448 extern const u32 nfs4_fattr_bitmap[3];
449 extern const u32 nfs4_statfs_bitmap[3];
450 extern const u32 nfs4_pathconf_bitmap[3];
451 extern const u32 nfs4_fsinfo_bitmap[3];
452 extern const u32 nfs4_fs_locations_bitmap[3];
453
454 void nfs40_shutdown_client(struct nfs_client *);
455 void nfs41_shutdown_client(struct nfs_client *);
456 int nfs40_init_client(struct nfs_client *);
457 int nfs41_init_client(struct nfs_client *);
458 void nfs4_free_client(struct nfs_client *);
459
460 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
461
462 /* nfs4renewd.c */
463 extern void nfs4_schedule_state_renewal(struct nfs_client *);
464 extern void nfs4_kill_renewd(struct nfs_client *);
465 extern void nfs4_renew_state(struct work_struct *);
466 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
467
468
469 /* nfs4state.c */
470 extern const nfs4_stateid current_stateid;
471
472 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
473 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
474 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
475 int nfs4_discover_server_trunking(struct nfs_client *clp,
476 struct nfs_client **);
477 int nfs40_discover_server_trunking(struct nfs_client *clp,
478 struct nfs_client **, const struct cred *);
479 #if defined(CONFIG_NFS_V4_1)
480 int nfs41_discover_server_trunking(struct nfs_client *clp,
481 struct nfs_client **, const struct cred *);
482 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
483 extern void nfs41_notify_server(struct nfs_client *);
484 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
485 struct nfs41_server_owner *o2);
486 #else
487 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
488 {
489 }
490 #endif /* CONFIG_NFS_V4_1 */
491
492 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
493 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
494 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
495 extern void nfs4_free_state_owners(struct list_head *head);
496 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
497 extern void nfs4_put_open_state(struct nfs4_state *);
498 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
499 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
500 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
501 extern void nfs_inode_find_state_and_recover(struct inode *inode,
502 const nfs4_stateid *stateid);
503 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
504 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
505 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
506 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
507 extern void nfs4_schedule_state_manager(struct nfs_client *);
508 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
509 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
510 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
511 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
512 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
513 extern void nfs41_handle_server_scope(struct nfs_client *,
514 struct nfs41_server_scope **);
515 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
516 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
517 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
518 const struct nfs_lock_context *, nfs4_stateid *,
519 const struct cred **);
520 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
521 struct nfs4_state *state);
522
523 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
524 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
525 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
526 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
527 extern void nfs_release_seqid(struct nfs_seqid *seqid);
528 extern void nfs_free_seqid(struct nfs_seqid *seqid);
529 extern int nfs4_setup_sequence(struct nfs_client *client,
530 struct nfs4_sequence_args *args,
531 struct nfs4_sequence_res *res,
532 struct rpc_task *task);
533 extern int nfs4_sequence_done(struct rpc_task *task,
534 struct nfs4_sequence_res *res);
535
536 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
537 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
538 extern const nfs4_stateid zero_stateid;
539 extern const nfs4_stateid invalid_stateid;
540
541 /* nfs4super.c */
542 struct nfs_mount_info;
543 extern struct nfs_subversion nfs_v4;
544 extern bool nfs4_disable_idmapping;
545 extern unsigned short max_session_slots;
546 extern unsigned short max_session_cb_slots;
547 extern unsigned short send_implementation_id;
548 extern bool recover_lost_locks;
549
550 #define NFS4_CLIENT_ID_UNIQ_LEN (64)
551 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
552
553 extern int nfs4_try_get_tree(struct fs_context *);
554 extern int nfs4_get_referral_tree(struct fs_context *);
555
556 /* nfs4sysctl.c */
557 #ifdef CONFIG_SYSCTL
558 int nfs4_register_sysctl(void);
559 void nfs4_unregister_sysctl(void);
560 #else
561 static inline int nfs4_register_sysctl(void)
562 {
563 return 0;
564 }
565
566 static inline void nfs4_unregister_sysctl(void)
567 {
568 }
569 #endif
570
571 /* nfs4xdr.c */
572 extern const struct rpc_procinfo nfs4_procedures[];
573
574 #ifdef CONFIG_NFS_V4_2
575 extern const u32 nfs42_maxsetxattr_overhead;
576 extern const u32 nfs42_maxgetxattr_overhead;
577 extern const u32 nfs42_maxlistxattrs_overhead;
578 #endif
579
580 struct nfs4_mount_data;
581
582 /* callback_xdr.c */
583 extern const struct svc_version nfs4_callback_version1;
584 extern const struct svc_version nfs4_callback_version4;
585
586 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
587 {
588 memcpy(dst->data, src->data, sizeof(dst->data));
589 dst->type = src->type;
590 }
591
592 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
593 {
594 if (dst->type != src->type)
595 return false;
596 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
597 }
598
599 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
600 {
601 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
602 }
603
604 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
605 {
606 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
607 }
608
609 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
610 {
611 u32 seq1 = be32_to_cpu(s1->seqid);
612 u32 seq2 = be32_to_cpu(s2->seqid);
613
614 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
615 }
616
617 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
618 {
619 return nfs4_stateid_match_other(dst, src) &&
620 !(src->seqid && nfs4_stateid_is_newer(dst, src));
621 }
622
623 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
624 {
625 u32 seqid = be32_to_cpu(s1->seqid);
626
627 if (++seqid == 0)
628 ++seqid;
629 s1->seqid = cpu_to_be32(seqid);
630 }
631
632 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
633 {
634 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
635 }
636
637 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
638 const nfs4_stateid *stateid)
639 {
640 return test_bit(NFS_OPEN_STATE, &state->flags) &&
641 nfs4_stateid_match_other(&state->open_stateid, stateid);
642 }
643
644 /* nfs42xattr.c */
645 #ifdef CONFIG_NFS_V4_2
646 extern int __init nfs4_xattr_cache_init(void);
647 extern void nfs4_xattr_cache_exit(void);
648 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
649 const char *buf, struct page **pages,
650 ssize_t buflen);
651 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
652 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
653 char *buf, ssize_t buflen);
654 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
655 ssize_t buflen);
656 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
657 ssize_t buflen);
658 extern void nfs4_xattr_cache_zap(struct inode *inode);
659 #else
660 static inline void nfs4_xattr_cache_zap(struct inode *inode)
661 {
662 }
663 #endif /* CONFIG_NFS_V4_2 */
664
665 #else /* CONFIG_NFS_V4 */
666
667 #define nfs4_close_state(a, b) do { } while (0)
668 #define nfs4_close_sync(a, b) do { } while (0)
669 #define nfs4_state_protect(a, b, c, d) do { } while (0)
670 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
671
672
673 #endif /* CONFIG_NFS_V4 */
674 #endif /* __LINUX_FS_NFS_NFS4_FS.H */
675
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.