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
28struct idmap;
29
30enum 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
56struct nfs_seqid_counter;
57struct 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_fattr *);
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
83struct nfs_seqid_counter {
84 ktime_t create_time;
85 u64 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
93struct nfs_seqid {
94 struct nfs_seqid_counter *sequence;
95 struct list_head list;
96 struct rpc_task *task;
97};
98
99static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
100{
101 if (seqid_mutating_err(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 */
110struct 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 struct mutex so_delegreturn_mutex;
124};
125
126enum {
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
147struct 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#define NFS_LOCK_UNLOCKING 2
153 unsigned long ls_flags;
154 struct nfs_seqid_counter ls_seqid;
155 nfs4_stateid ls_stateid;
156 refcount_t ls_count;
157 fl_owner_t ls_owner;
158};
159
160/* bits for nfs4_state->flags */
161enum {
162 LK_STATE_IN_USE,
163 NFS_DELEGATED_STATE, /* Current stateid is delegation */
164 NFS_OPEN_STATE, /* OPEN stateid is set */
165 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
166 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
167 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
168 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
169 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
170 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
171 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
172 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
173 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
174 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
175 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/
176 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */
177};
178
179struct nfs4_state {
180 struct list_head open_states; /* List of states for the same state_owner */
181 struct list_head inode_states; /* List of states for the same inode */
182 struct list_head lock_states; /* List of subservient lock stateids */
183
184 struct nfs4_state_owner *owner; /* Pointer to the open owner */
185 struct inode *inode; /* Pointer to the inode */
186
187 unsigned long flags; /* Do we hold any locks? */
188 spinlock_t state_lock; /* Protects the lock_states list */
189
190 seqlock_t seqlock; /* Protects the stateid/open_stateid */
191 nfs4_stateid stateid; /* Current stateid: may be delegation */
192 nfs4_stateid open_stateid; /* OPEN stateid */
193
194 /* The following 3 fields are protected by owner->so_lock */
195 unsigned int n_rdonly; /* Number of read-only references */
196 unsigned int n_wronly; /* Number of write-only references */
197 unsigned int n_rdwr; /* Number of read/write references */
198 fmode_t state; /* State on the server (R,W, or RW) */
199 refcount_t count;
200
201 wait_queue_head_t waitq;
202 struct rcu_head rcu_head;
203};
204
205
206struct nfs4_exception {
207 struct nfs4_state *state;
208 struct inode *inode;
209 nfs4_stateid *stateid;
210 long timeout;
211 unsigned short retrans;
212 unsigned char task_is_privileged : 1;
213 unsigned char delay : 1,
214 recovering : 1,
215 retry : 1;
216 bool interruptible;
217};
218
219struct 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
230struct 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
254struct nfs4_add_xprt_data {
255 struct nfs_client *clp;
256 const struct cred *cred;
257};
258
259struct 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
265struct 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
271extern const struct dentry_operations nfs4_dentry_operations;
272
273/* dir.c */
274int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
275 unsigned, umode_t);
276
277/* fs_context.c */
278extern struct file_system_type nfs4_fs_type;
279
280/* nfs4namespace.c */
281struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
282 const struct qstr *);
283int nfs4_submount(struct fs_context *, struct nfs_server *);
284int nfs4_replace_transport(struct nfs_server *server,
285 const struct nfs4_fs_locations *locations);
286size_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 */
289extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
290extern int nfs4_async_handle_error(struct rpc_task *task,
291 struct nfs_server *server,
292 struct nfs4_state *state, long *timeout);
293extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
294 struct rpc_message *, struct nfs4_sequence_args *,
295 struct nfs4_sequence_res *, int);
296extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
297extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
298extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
299extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *,
300 struct nfs_fattr *, bool);
301extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
302extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
303extern int nfs4_destroy_clientid(struct nfs_client *clp);
304extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
305extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
306extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
307extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
308extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
309 struct nfs4_fs_locations *, struct page *);
310extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
311 struct nfs4_fs_locations *,
312 struct page *page, const struct cred *);
313extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
314extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
315 struct dentry *,
316 struct nfs_fh *,
317 struct nfs_fattr *);
318extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
319extern const struct xattr_handler * const nfs4_xattr_handlers[];
320extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
321 const struct nfs_open_context *ctx,
322 const struct nfs_lock_context *l_ctx,
323 fmode_t fmode);
324extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
325 struct inode *inode, unsigned long cache_validity);
326extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
327 struct nfs_fattr *fattr, struct inode *inode);
328extern int update_open_stateid(struct nfs4_state *state,
329 const nfs4_stateid *open_stateid,
330 const nfs4_stateid *deleg_stateid,
331 fmode_t fmode);
332extern int nfs4_proc_setlease(struct file *file, int arg,
333 struct file_lease **lease, void **priv);
334extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
335 struct nfs_fsinfo *fsinfo);
336extern void nfs4_update_changeattr(struct inode *dir,
337 struct nfs4_change_info *cinfo,
338 unsigned long timestamp,
339 unsigned long cache_validity);
340extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
341 struct page **pages);
342
343#if defined(CONFIG_NFS_V4_1)
344extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
345extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
346extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
347extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
348 bool sync);
349extern int nfs4_detect_session_trunking(struct nfs_client *clp,
350 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
351
352static inline bool
353is_ds_only_client(struct nfs_client *clp)
354{
355 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
356 EXCHGID4_FLAG_USE_PNFS_DS;
357}
358
359static inline bool
360is_ds_client(struct nfs_client *clp)
361{
362 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
363}
364
365static inline bool
366_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
367 struct rpc_clnt **clntp, struct rpc_message *msg)
368{
369 rpc_authflavor_t flavor;
370
371 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
372 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
373 /* Using machine creds for cleanup operations
374 * is only relevent if the client credentials
375 * might expire. So don't bother for
376 * RPC_AUTH_UNIX. If file was only exported to
377 * sec=sys, the PUTFH would fail anyway.
378 */
379 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
380 return false;
381 }
382 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
383 msg->rpc_cred = rpc_machine_cred();
384
385 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
386 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
387 flavor != RPC_AUTH_GSS_KRB5P);
388 *clntp = clp->cl_rpcclient;
389
390 return true;
391 }
392 return false;
393}
394
395/*
396 * Function responsible for determining if an rpc_message should use the
397 * machine cred under SP4_MACH_CRED and if so switching the credential and
398 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
399 * Should be called before rpc_call_sync/rpc_call_async.
400 */
401static inline void
402nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
403 struct rpc_clnt **clntp, struct rpc_message *msg)
404{
405 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
406}
407
408/*
409 * Special wrapper to nfs4_state_protect for write.
410 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
411 * that use machine cred use NFS_FILE_SYNC.
412 */
413static inline void
414nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
415 struct rpc_message *msg, struct nfs_pgio_header *hdr)
416{
417 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
418 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
419 hdr->args.stable = NFS_FILE_SYNC;
420}
421#else /* CONFIG_NFS_v4_1 */
422static inline bool
423is_ds_only_client(struct nfs_client *clp)
424{
425 return false;
426}
427
428static inline bool
429is_ds_client(struct nfs_client *clp)
430{
431 return false;
432}
433
434static inline void
435nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
436 struct rpc_clnt **clntp, struct rpc_message *msg)
437{
438}
439
440static inline void
441nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
442 struct rpc_message *msg, struct nfs_pgio_header *hdr)
443{
444}
445#endif /* CONFIG_NFS_V4_1 */
446
447extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
448
449extern const u32 nfs4_fattr_bitmap[3];
450extern const u32 nfs4_statfs_bitmap[3];
451extern const u32 nfs4_pathconf_bitmap[3];
452extern const u32 nfs4_fsinfo_bitmap[3];
453extern const u32 nfs4_fs_locations_bitmap[3];
454
455void nfs40_shutdown_client(struct nfs_client *);
456void nfs41_shutdown_client(struct nfs_client *);
457int nfs40_init_client(struct nfs_client *);
458int nfs41_init_client(struct nfs_client *);
459void nfs4_free_client(struct nfs_client *);
460
461struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
462
463/* nfs4renewd.c */
464extern void nfs4_schedule_state_renewal(struct nfs_client *);
465extern void nfs4_kill_renewd(struct nfs_client *);
466extern void nfs4_renew_state(struct work_struct *);
467extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
468
469
470/* nfs4state.c */
471extern const nfs4_stateid current_stateid;
472
473const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
474const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
475const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
476int nfs4_discover_server_trunking(struct nfs_client *clp,
477 struct nfs_client **);
478int nfs40_discover_server_trunking(struct nfs_client *clp,
479 struct nfs_client **, const struct cred *);
480#if defined(CONFIG_NFS_V4_1)
481int nfs41_discover_server_trunking(struct nfs_client *clp,
482 struct nfs_client **, const struct cred *);
483extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
484extern void nfs41_notify_server(struct nfs_client *);
485bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
486 struct nfs41_server_owner *o2);
487#else
488static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
489{
490}
491#endif /* CONFIG_NFS_V4_1 */
492
493extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
494extern void nfs4_put_state_owner(struct nfs4_state_owner *);
495extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
496extern void nfs4_free_state_owners(struct list_head *head);
497extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
498extern void nfs4_put_open_state(struct nfs4_state *);
499extern void nfs4_close_state(struct nfs4_state *, fmode_t);
500extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
501extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
502extern void nfs_inode_find_state_and_recover(struct inode *inode,
503 const nfs4_stateid *stateid);
504extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
505extern void nfs4_schedule_lease_recovery(struct nfs_client *);
506extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
507extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
508extern void nfs4_schedule_state_manager(struct nfs_client *);
509extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
510extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
511extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
512extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
513extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
514extern void nfs41_handle_server_scope(struct nfs_client *,
515 struct nfs41_server_scope **);
516extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
517extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
518extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
519 const struct nfs_lock_context *, nfs4_stateid *,
520 const struct cred **);
521extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
522 struct nfs4_state *state);
523
524extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
525extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
526extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
527extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
528extern void nfs_release_seqid(struct nfs_seqid *seqid);
529extern void nfs_free_seqid(struct nfs_seqid *seqid);
530extern int nfs4_setup_sequence(struct nfs_client *client,
531 struct nfs4_sequence_args *args,
532 struct nfs4_sequence_res *res,
533 struct rpc_task *task);
534extern int nfs4_sequence_done(struct rpc_task *task,
535 struct nfs4_sequence_res *res);
536
537extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
538extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
539extern const nfs4_stateid zero_stateid;
540extern const nfs4_stateid invalid_stateid;
541
542/* nfs4super.c */
543struct nfs_mount_info;
544extern struct nfs_subversion nfs_v4;
545extern bool nfs4_disable_idmapping;
546extern unsigned short max_session_slots;
547extern unsigned short max_session_cb_slots;
548extern unsigned short send_implementation_id;
549extern bool recover_lost_locks;
550extern short nfs_delay_retrans;
551
552#define NFS4_CLIENT_ID_UNIQ_LEN (64)
553extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
554
555extern int nfs4_try_get_tree(struct fs_context *);
556extern int nfs4_get_referral_tree(struct fs_context *);
557
558/* nfs4sysctl.c */
559#ifdef CONFIG_SYSCTL
560int nfs4_register_sysctl(void);
561void nfs4_unregister_sysctl(void);
562#else
563static inline int nfs4_register_sysctl(void)
564{
565 return 0;
566}
567
568static inline void nfs4_unregister_sysctl(void)
569{
570}
571#endif
572
573/* nfs4xdr.c */
574extern const struct rpc_procinfo nfs4_procedures[];
575
576#ifdef CONFIG_NFS_V4_2
577extern const u32 nfs42_maxsetxattr_overhead;
578extern const u32 nfs42_maxgetxattr_overhead;
579extern const u32 nfs42_maxlistxattrs_overhead;
580#endif
581
582struct nfs4_mount_data;
583
584/* callback_xdr.c */
585extern const struct svc_version nfs4_callback_version1;
586extern const struct svc_version nfs4_callback_version4;
587
588static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
589{
590 memcpy(to: dst->data, from: src->data, len: sizeof(dst->data));
591 dst->type = src->type;
592}
593
594static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
595{
596 if (dst->type != src->type)
597 return false;
598 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
599}
600
601static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
602{
603 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
604}
605
606static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
607{
608 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
609}
610
611static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
612{
613 u32 seq1 = be32_to_cpu(s1->seqid);
614 u32 seq2 = be32_to_cpu(s2->seqid);
615
616 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
617}
618
619static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
620{
621 return nfs4_stateid_match_other(dst, src) &&
622 !(src->seqid && nfs4_stateid_is_newer(s1: dst, s2: src));
623}
624
625static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
626{
627 u32 seqid = be32_to_cpu(s1->seqid);
628
629 if (++seqid == 0)
630 ++seqid;
631 s1->seqid = cpu_to_be32(seqid);
632}
633
634static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
635{
636 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
637}
638
639static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
640 const nfs4_stateid *stateid)
641{
642 return test_bit(NFS_OPEN_STATE, &state->flags) &&
643 nfs4_stateid_match_other(dst: &state->open_stateid, src: stateid);
644}
645
646/* nfs42xattr.c */
647#ifdef CONFIG_NFS_V4_2
648extern int __init nfs4_xattr_cache_init(void);
649extern void nfs4_xattr_cache_exit(void);
650extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
651 const char *buf, struct page **pages,
652 ssize_t buflen);
653extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
654extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
655 char *buf, ssize_t buflen);
656extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
657 ssize_t buflen);
658extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
659 ssize_t buflen);
660extern void nfs4_xattr_cache_zap(struct inode *inode);
661#else
662static inline void nfs4_xattr_cache_zap(struct inode *inode)
663{
664}
665#endif /* CONFIG_NFS_V4_2 */
666
667#else /* CONFIG_NFS_V4 */
668
669#define nfs4_close_state(a, b) do { } while (0)
670#define nfs4_close_sync(a, b) do { } while (0)
671#define nfs4_state_protect(a, b, c, d) do { } while (0)
672#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
673
674
675#endif /* CONFIG_NFS_V4 */
676#endif /* __LINUX_FS_NFS_NFS4_FS.H */
677