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1/*
2 * linux/fs/nfs/nfs4_fs.h
3 *
4 * Copyright (C) 2005 Trond Myklebust
5 *
6 * NFSv4-specific filesystem definitions and declarations
7 */
8
9#ifndef __LINUX_FS_NFS_NFS4_FS_H
10#define __LINUX_FS_NFS_NFS4_FS_H
11
12#if defined(CONFIG_NFS_V4_2)
13#define NFS4_MAX_MINOR_VERSION 2
14#elif defined(CONFIG_NFS_V4_1)
15#define NFS4_MAX_MINOR_VERSION 1
16#else
17#define NFS4_MAX_MINOR_VERSION 0
18#endif
19
20#if IS_ENABLED(CONFIG_NFS_V4)
21
22#define NFS4_MAX_LOOP_ON_RECOVER (10)
23
24#include <linux/seqlock.h>
25
26struct idmap;
27
28enum nfs4_client_state {
29 NFS4CLNT_MANAGER_RUNNING = 0,
30 NFS4CLNT_CHECK_LEASE,
31 NFS4CLNT_LEASE_EXPIRED,
32 NFS4CLNT_RECLAIM_REBOOT,
33 NFS4CLNT_RECLAIM_NOGRACE,
34 NFS4CLNT_DELEGRETURN,
35 NFS4CLNT_SESSION_RESET,
36 NFS4CLNT_LEASE_CONFIRM,
37 NFS4CLNT_SERVER_SCOPE_MISMATCH,
38 NFS4CLNT_PURGE_STATE,
39 NFS4CLNT_BIND_CONN_TO_SESSION,
40 NFS4CLNT_MOVED,
41 NFS4CLNT_LEASE_MOVED,
42};
43
44#define NFS4_RENEW_TIMEOUT 0x01
45#define NFS4_RENEW_DELEGATION_CB 0x02
46
47struct nfs4_minor_version_ops {
48 u32 minor_version;
49 unsigned init_caps;
50
51 int (*init_client)(struct nfs_client *);
52 void (*shutdown_client)(struct nfs_client *);
53 bool (*match_stateid)(const nfs4_stateid *,
54 const nfs4_stateid *);
55 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
56 struct nfs_fsinfo *);
57 int (*free_lock_state)(struct nfs_server *,
58 struct nfs4_lock_state *);
59 const struct rpc_call_ops *call_sync_ops;
60 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
61 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
62 const struct nfs4_state_maintenance_ops *state_renewal_ops;
63 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
64};
65
66#define NFS_SEQID_CONFIRMED 1
67struct nfs_seqid_counter {
68 ktime_t create_time;
69 int owner_id;
70 int flags;
71 u32 counter;
72 spinlock_t lock; /* Protects the list */
73 struct list_head list; /* Defines sequence of RPC calls */
74 struct rpc_wait_queue wait; /* RPC call delay queue */
75};
76
77struct nfs_seqid {
78 struct nfs_seqid_counter *sequence;
79 struct list_head list;
80 struct rpc_task *task;
81};
82
83static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
84{
85 if (seqid_mutating_err(-status))
86 seqid->flags |= NFS_SEQID_CONFIRMED;
87}
88
89/*
90 * NFS4 state_owners and lock_owners are simply labels for ordered
91 * sequences of RPC calls. Their sole purpose is to provide once-only
92 * semantics by allowing the server to identify replayed requests.
93 */
94struct nfs4_state_owner {
95 struct nfs_server *so_server;
96 struct list_head so_lru;
97 unsigned long so_expires;
98 struct rb_node so_server_node;
99
100 struct rpc_cred *so_cred; /* Associated cred */
101
102 spinlock_t so_lock;
103 atomic_t so_count;
104 unsigned long so_flags;
105 struct list_head so_states;
106 struct nfs_seqid_counter so_seqid;
107 seqcount_t so_reclaim_seqcount;
108 struct mutex so_delegreturn_mutex;
109};
110
111enum {
112 NFS_OWNER_RECLAIM_REBOOT,
113 NFS_OWNER_RECLAIM_NOGRACE
114};
115
116#define NFS_LOCK_NEW 0
117#define NFS_LOCK_RECLAIM 1
118#define NFS_LOCK_EXPIRED 2
119
120/*
121 * struct nfs4_state maintains the client-side state for a given
122 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
123 *
124 * OPEN:
125 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
126 * we need to know how many files are open for reading or writing on a
127 * given inode. This information too is stored here.
128 *
129 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
130 */
131
132struct nfs4_lock_owner {
133 unsigned int lo_type;
134#define NFS4_ANY_LOCK_TYPE (0U)
135#define NFS4_FLOCK_LOCK_TYPE (1U << 0)
136#define NFS4_POSIX_LOCK_TYPE (1U << 1)
137 union {
138 fl_owner_t posix_owner;
139 pid_t flock_owner;
140 } lo_u;
141};
142
143struct nfs4_lock_state {
144 struct list_head ls_locks; /* Other lock stateids */
145 struct nfs4_state * ls_state; /* Pointer to open state */
146#define NFS_LOCK_INITIALIZED 0
147#define NFS_LOCK_LOST 1
148 unsigned long ls_flags;
149 struct nfs_seqid_counter ls_seqid;
150 nfs4_stateid ls_stateid;
151 atomic_t ls_count;
152 struct nfs4_lock_owner ls_owner;
153};
154
155/* bits for nfs4_state->flags */
156enum {
157 LK_STATE_IN_USE,
158 NFS_DELEGATED_STATE, /* Current stateid is delegation */
159 NFS_OPEN_STATE, /* OPEN stateid is set */
160 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
161 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
162 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
163 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
164 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
165 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
166 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
167};
168
169struct nfs4_state {
170 struct list_head open_states; /* List of states for the same state_owner */
171 struct list_head inode_states; /* List of states for the same inode */
172 struct list_head lock_states; /* List of subservient lock stateids */
173
174 struct nfs4_state_owner *owner; /* Pointer to the open owner */
175 struct inode *inode; /* Pointer to the inode */
176
177 unsigned long flags; /* Do we hold any locks? */
178 spinlock_t state_lock; /* Protects the lock_states list */
179
180 seqlock_t seqlock; /* Protects the stateid/open_stateid */
181 nfs4_stateid stateid; /* Current stateid: may be delegation */
182 nfs4_stateid open_stateid; /* OPEN stateid */
183
184 /* The following 3 fields are protected by owner->so_lock */
185 unsigned int n_rdonly; /* Number of read-only references */
186 unsigned int n_wronly; /* Number of write-only references */
187 unsigned int n_rdwr; /* Number of read/write references */
188 fmode_t state; /* State on the server (R,W, or RW) */
189 atomic_t count;
190};
191
192
193struct nfs4_exception {
194 long timeout;
195 int retry;
196 struct nfs4_state *state;
197 struct inode *inode;
198};
199
200struct nfs4_state_recovery_ops {
201 int owner_flag_bit;
202 int state_flag_bit;
203 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
204 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
205 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
206 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
207 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
208 struct rpc_cred *);
209};
210
211struct nfs4_state_maintenance_ops {
212 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
213 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
214 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
215};
216
217struct nfs4_mig_recovery_ops {
218 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
219 struct page *, struct rpc_cred *);
220 int (*fsid_present)(struct inode *, struct rpc_cred *);
221};
222
223extern const struct dentry_operations nfs4_dentry_operations;
224
225/* dir.c */
226int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
227 unsigned, umode_t, int *);
228
229/* super.c */
230extern struct file_system_type nfs4_fs_type;
231
232/* nfs4namespace.c */
233struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
234struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
235 struct nfs_fh *, struct nfs_fattr *);
236int nfs4_replace_transport(struct nfs_server *server,
237 const struct nfs4_fs_locations *locations);
238
239/* nfs4proc.c */
240extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
241extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
242extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
243extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
244extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
245extern int nfs4_destroy_clientid(struct nfs_client *clp);
246extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
247extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
248extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
249extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
250extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
251 struct nfs4_fs_locations *, struct page *);
252extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
253 struct page *page, struct rpc_cred *);
254extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
255extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
256 struct nfs_fh *, struct nfs_fattr *);
257extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
258extern const struct xattr_handler *nfs4_xattr_handlers[];
259extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
260 const struct nfs_open_context *ctx,
261 const struct nfs_lock_context *l_ctx,
262 fmode_t fmode);
263
264#if defined(CONFIG_NFS_V4_1)
265static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
266{
267 return server->nfs_client->cl_session;
268}
269
270extern int nfs41_setup_sequence(struct nfs4_session *session,
271 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
272 struct rpc_task *task);
273extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
274extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
275extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
276extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
277 struct nfs_fsinfo *fsinfo);
278extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
279 bool sync);
280
281static inline bool
282is_ds_only_client(struct nfs_client *clp)
283{
284 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
285 EXCHGID4_FLAG_USE_PNFS_DS;
286}
287
288static inline bool
289is_ds_client(struct nfs_client *clp)
290{
291 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
292}
293
294static inline bool
295_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
296 struct rpc_clnt **clntp, struct rpc_message *msg)
297{
298 struct rpc_cred *newcred = NULL;
299 rpc_authflavor_t flavor;
300
301 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
302 spin_lock(&clp->cl_lock);
303 if (clp->cl_machine_cred != NULL)
304 /* don't call get_rpccred on the machine cred -
305 * a reference will be held for life of clp */
306 newcred = clp->cl_machine_cred;
307 spin_unlock(&clp->cl_lock);
308 msg->rpc_cred = newcred;
309
310 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
311 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
312 flavor != RPC_AUTH_GSS_KRB5P);
313 *clntp = clp->cl_rpcclient;
314
315 return true;
316 }
317 return false;
318}
319
320/*
321 * Function responsible for determining if an rpc_message should use the
322 * machine cred under SP4_MACH_CRED and if so switching the credential and
323 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
324 * Should be called before rpc_call_sync/rpc_call_async.
325 */
326static inline void
327nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
328 struct rpc_clnt **clntp, struct rpc_message *msg)
329{
330 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
331}
332
333/*
334 * Special wrapper to nfs4_state_protect for write.
335 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
336 * that use machine cred use NFS_FILE_SYNC.
337 */
338static inline void
339nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
340 struct rpc_message *msg, struct nfs_write_data *wdata)
341{
342 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
343 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
344 wdata->args.stable = NFS_FILE_SYNC;
345}
346#else /* CONFIG_NFS_v4_1 */
347static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
348{
349 return NULL;
350}
351
352static inline bool
353is_ds_only_client(struct nfs_client *clp)
354{
355 return false;
356}
357
358static inline bool
359is_ds_client(struct nfs_client *clp)
360{
361 return false;
362}
363
364static inline void
365nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
366 struct rpc_clnt **clntp, struct rpc_message *msg)
367{
368}
369
370static inline void
371nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
372 struct rpc_message *msg, struct nfs_write_data *wdata)
373{
374}
375#endif /* CONFIG_NFS_V4_1 */
376
377extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
378
379extern const u32 nfs4_fattr_bitmap[3];
380extern const u32 nfs4_statfs_bitmap[3];
381extern const u32 nfs4_pathconf_bitmap[3];
382extern const u32 nfs4_fsinfo_bitmap[3];
383extern const u32 nfs4_fs_locations_bitmap[3];
384
385void nfs40_shutdown_client(struct nfs_client *);
386void nfs41_shutdown_client(struct nfs_client *);
387int nfs40_init_client(struct nfs_client *);
388int nfs41_init_client(struct nfs_client *);
389void nfs4_free_client(struct nfs_client *);
390
391struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
392
393/* nfs4renewd.c */
394extern void nfs4_schedule_state_renewal(struct nfs_client *);
395extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
396extern void nfs4_kill_renewd(struct nfs_client *);
397extern void nfs4_renew_state(struct work_struct *);
398
399/* nfs4state.c */
400struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
401struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
402struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
403int nfs4_discover_server_trunking(struct nfs_client *clp,
404 struct nfs_client **);
405int nfs40_discover_server_trunking(struct nfs_client *clp,
406 struct nfs_client **, struct rpc_cred *);
407#if defined(CONFIG_NFS_V4_1)
408int nfs41_discover_server_trunking(struct nfs_client *clp,
409 struct nfs_client **, struct rpc_cred *);
410extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
411extern void nfs41_server_notify_target_slotid_update(struct nfs_client *clp);
412extern void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp);
413
414#else
415static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
416{
417}
418#endif /* CONFIG_NFS_V4_1 */
419
420extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
421extern void nfs4_put_state_owner(struct nfs4_state_owner *);
422extern void nfs4_purge_state_owners(struct nfs_server *);
423extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
424extern void nfs4_put_open_state(struct nfs4_state *);
425extern void nfs4_close_state(struct nfs4_state *, fmode_t);
426extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
427extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
428extern void nfs_inode_find_state_and_recover(struct inode *inode,
429 const nfs4_stateid *stateid);
430extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
431extern void nfs4_schedule_lease_recovery(struct nfs_client *);
432extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
433extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
434extern void nfs4_schedule_state_manager(struct nfs_client *);
435extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
436extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
437extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
438extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
439extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
440extern void nfs41_handle_server_scope(struct nfs_client *,
441 struct nfs41_server_scope **);
442extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
443extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
444extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
445 fmode_t, const struct nfs_lockowner *);
446
447extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
448extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
449extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
450extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
451extern void nfs_release_seqid(struct nfs_seqid *seqid);
452extern void nfs_free_seqid(struct nfs_seqid *seqid);
453
454extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
455
456extern const nfs4_stateid zero_stateid;
457
458/* nfs4super.c */
459struct nfs_mount_info;
460extern struct nfs_subversion nfs_v4;
461struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
462extern bool nfs4_disable_idmapping;
463extern unsigned short max_session_slots;
464extern unsigned short send_implementation_id;
465extern bool recover_lost_locks;
466
467#define NFS4_CLIENT_ID_UNIQ_LEN (64)
468extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
469
470/* nfs4sysctl.c */
471#ifdef CONFIG_SYSCTL
472int nfs4_register_sysctl(void);
473void nfs4_unregister_sysctl(void);
474#else
475static inline int nfs4_register_sysctl(void)
476{
477 return 0;
478}
479
480static inline void nfs4_unregister_sysctl(void)
481{
482}
483#endif
484
485/* nfs4xdr.c */
486extern struct rpc_procinfo nfs4_procedures[];
487
488struct nfs4_mount_data;
489
490/* callback_xdr.c */
491extern struct svc_version nfs4_callback_version1;
492extern struct svc_version nfs4_callback_version4;
493
494static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
495{
496 memcpy(dst, src, sizeof(*dst));
497}
498
499static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
500{
501 return memcmp(dst, src, sizeof(*dst)) == 0;
502}
503
504static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
505{
506 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
507}
508
509static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
510{
511 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
512}
513
514static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
515{
516 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
517}
518
519#else
520
521#define nfs4_close_state(a, b) do { } while (0)
522#define nfs4_close_sync(a, b) do { } while (0)
523#define nfs4_state_protect(a, b, c, d) do { } while (0)
524#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
525
526#endif /* CONFIG_NFS_V4 */
527#endif /* __LINUX_FS_NFS_NFS4_FS.H */
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
27struct idmap;
28
29enum 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
55struct nfs_seqid_counter;
56struct 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
82struct 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
92struct nfs_seqid {
93 struct nfs_seqid_counter *sequence;
94 struct list_head list;
95 struct rpc_task *task;
96};
97
98static 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 */
109struct 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
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 char task_is_privileged : 1;
212 unsigned char delay : 1,
213 recovering : 1,
214 retry : 1;
215 bool interruptible;
216};
217
218struct nfs4_state_recovery_ops {
219 int owner_flag_bit;
220 int state_flag_bit;
221 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
222 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
223 int (*establish_clid)(struct nfs_client *, const struct cred *);
224 int (*reclaim_complete)(struct nfs_client *, const struct cred *);
225 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
226 const struct cred *);
227};
228
229struct nfs4_opendata {
230 struct kref kref;
231 struct nfs_openargs o_arg;
232 struct nfs_openres o_res;
233 struct nfs_open_confirmargs c_arg;
234 struct nfs_open_confirmres c_res;
235 struct nfs4_string owner_name;
236 struct nfs4_string group_name;
237 struct nfs4_label *a_label;
238 struct nfs_fattr f_attr;
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
253struct nfs4_add_xprt_data {
254 struct nfs_client *clp;
255 const struct cred *cred;
256};
257
258struct 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
264struct nfs4_mig_recovery_ops {
265 int (*get_locations)(struct nfs_server *, struct nfs_fh *,
266 struct nfs4_fs_locations *, struct page *, const struct cred *);
267 int (*fsid_present)(struct inode *, const struct cred *);
268};
269
270extern const struct dentry_operations nfs4_dentry_operations;
271
272/* dir.c */
273int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
274 unsigned, umode_t);
275
276/* fs_context.c */
277extern struct file_system_type nfs4_fs_type;
278
279/* nfs4namespace.c */
280struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
281 const struct qstr *);
282int nfs4_submount(struct fs_context *, struct nfs_server *);
283int nfs4_replace_transport(struct nfs_server *server,
284 const struct nfs4_fs_locations *locations);
285size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss,
286 size_t salen, struct net *net, int port);
287/* nfs4proc.c */
288extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
289extern int nfs4_async_handle_error(struct rpc_task *task,
290 struct nfs_server *server,
291 struct nfs4_state *state, long *timeout);
292extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
293 struct rpc_message *, struct nfs4_sequence_args *,
294 struct nfs4_sequence_res *, int);
295extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
296extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
297extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
298extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
299extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
300extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
301extern int nfs4_destroy_clientid(struct nfs_client *clp);
302extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
303extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
304extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
305extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
306extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
307 struct nfs4_fs_locations *, struct page *);
308extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
309 struct nfs4_fs_locations *,
310 struct page *page, const struct cred *);
311extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
312extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
313 struct dentry *,
314 struct nfs_fh *,
315 struct nfs_fattr *);
316extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
317extern const struct xattr_handler *nfs4_xattr_handlers[];
318extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
319 const struct nfs_open_context *ctx,
320 const struct nfs_lock_context *l_ctx,
321 fmode_t fmode);
322extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
323 struct inode *inode, unsigned long cache_validity);
324extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
325 struct nfs_fattr *fattr, struct inode *inode);
326extern int update_open_stateid(struct nfs4_state *state,
327 const nfs4_stateid *open_stateid,
328 const nfs4_stateid *deleg_stateid,
329 fmode_t fmode);
330extern int nfs4_proc_setlease(struct file *file, long arg,
331 struct file_lock **lease, void **priv);
332extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
333 struct nfs_fsinfo *fsinfo);
334extern void nfs4_update_changeattr(struct inode *dir,
335 struct nfs4_change_info *cinfo,
336 unsigned long timestamp,
337 unsigned long cache_validity);
338extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
339 struct page **pages);
340
341#if defined(CONFIG_NFS_V4_1)
342extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
343extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
344extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
345extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
346 bool sync);
347extern int nfs4_detect_session_trunking(struct nfs_client *clp,
348 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
349
350static inline bool
351is_ds_only_client(struct nfs_client *clp)
352{
353 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
354 EXCHGID4_FLAG_USE_PNFS_DS;
355}
356
357static inline bool
358is_ds_client(struct nfs_client *clp)
359{
360 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
361}
362
363static inline bool
364_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
365 struct rpc_clnt **clntp, struct rpc_message *msg)
366{
367 rpc_authflavor_t flavor;
368
369 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
370 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
371 /* Using machine creds for cleanup operations
372 * is only relevent if the client credentials
373 * might expire. So don't bother for
374 * RPC_AUTH_UNIX. If file was only exported to
375 * sec=sys, the PUTFH would fail anyway.
376 */
377 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
378 return false;
379 }
380 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
381 msg->rpc_cred = rpc_machine_cred();
382
383 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
384 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
385 flavor != RPC_AUTH_GSS_KRB5P);
386 *clntp = clp->cl_rpcclient;
387
388 return true;
389 }
390 return false;
391}
392
393/*
394 * Function responsible for determining if an rpc_message should use the
395 * machine cred under SP4_MACH_CRED and if so switching the credential and
396 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
397 * Should be called before rpc_call_sync/rpc_call_async.
398 */
399static inline void
400nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
401 struct rpc_clnt **clntp, struct rpc_message *msg)
402{
403 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
404}
405
406/*
407 * Special wrapper to nfs4_state_protect for write.
408 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
409 * that use machine cred use NFS_FILE_SYNC.
410 */
411static inline void
412nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
413 struct rpc_message *msg, struct nfs_pgio_header *hdr)
414{
415 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
416 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
417 hdr->args.stable = NFS_FILE_SYNC;
418}
419#else /* CONFIG_NFS_v4_1 */
420static inline bool
421is_ds_only_client(struct nfs_client *clp)
422{
423 return false;
424}
425
426static inline bool
427is_ds_client(struct nfs_client *clp)
428{
429 return false;
430}
431
432static inline void
433nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
434 struct rpc_clnt **clntp, struct rpc_message *msg)
435{
436}
437
438static inline void
439nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
440 struct rpc_message *msg, struct nfs_pgio_header *hdr)
441{
442}
443#endif /* CONFIG_NFS_V4_1 */
444
445extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
446
447extern const u32 nfs4_fattr_bitmap[3];
448extern const u32 nfs4_statfs_bitmap[3];
449extern const u32 nfs4_pathconf_bitmap[3];
450extern const u32 nfs4_fsinfo_bitmap[3];
451extern const u32 nfs4_fs_locations_bitmap[3];
452
453void nfs40_shutdown_client(struct nfs_client *);
454void nfs41_shutdown_client(struct nfs_client *);
455int nfs40_init_client(struct nfs_client *);
456int nfs41_init_client(struct nfs_client *);
457void nfs4_free_client(struct nfs_client *);
458
459struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
460
461/* nfs4renewd.c */
462extern void nfs4_schedule_state_renewal(struct nfs_client *);
463extern void nfs4_kill_renewd(struct nfs_client *);
464extern void nfs4_renew_state(struct work_struct *);
465extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
466
467
468/* nfs4state.c */
469extern const nfs4_stateid current_stateid;
470
471const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
472const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
473const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
474int nfs4_discover_server_trunking(struct nfs_client *clp,
475 struct nfs_client **);
476int nfs40_discover_server_trunking(struct nfs_client *clp,
477 struct nfs_client **, const struct cred *);
478#if defined(CONFIG_NFS_V4_1)
479int nfs41_discover_server_trunking(struct nfs_client *clp,
480 struct nfs_client **, const struct cred *);
481extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
482extern void nfs41_notify_server(struct nfs_client *);
483bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
484 struct nfs41_server_owner *o2);
485#else
486static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
487{
488}
489#endif /* CONFIG_NFS_V4_1 */
490
491extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
492extern void nfs4_put_state_owner(struct nfs4_state_owner *);
493extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
494extern void nfs4_free_state_owners(struct list_head *head);
495extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
496extern void nfs4_put_open_state(struct nfs4_state *);
497extern void nfs4_close_state(struct nfs4_state *, fmode_t);
498extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
499extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
500extern void nfs_inode_find_state_and_recover(struct inode *inode,
501 const nfs4_stateid *stateid);
502extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
503extern void nfs4_schedule_lease_recovery(struct nfs_client *);
504extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
505extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
506extern void nfs4_schedule_state_manager(struct nfs_client *);
507extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
508extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
509extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
510extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
511extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
512extern void nfs41_handle_server_scope(struct nfs_client *,
513 struct nfs41_server_scope **);
514extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
515extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
516extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
517 const struct nfs_lock_context *, nfs4_stateid *,
518 const struct cred **);
519extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
520 struct nfs4_state *state);
521
522extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
523extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
524extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
525extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
526extern void nfs_release_seqid(struct nfs_seqid *seqid);
527extern void nfs_free_seqid(struct nfs_seqid *seqid);
528extern int nfs4_setup_sequence(struct nfs_client *client,
529 struct nfs4_sequence_args *args,
530 struct nfs4_sequence_res *res,
531 struct rpc_task *task);
532extern int nfs4_sequence_done(struct rpc_task *task,
533 struct nfs4_sequence_res *res);
534
535extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
536extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
537extern const nfs4_stateid zero_stateid;
538extern const nfs4_stateid invalid_stateid;
539
540/* nfs4super.c */
541struct nfs_mount_info;
542extern struct nfs_subversion nfs_v4;
543extern bool nfs4_disable_idmapping;
544extern unsigned short max_session_slots;
545extern unsigned short max_session_cb_slots;
546extern unsigned short send_implementation_id;
547extern bool recover_lost_locks;
548
549#define NFS4_CLIENT_ID_UNIQ_LEN (64)
550extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
551
552extern int nfs4_try_get_tree(struct fs_context *);
553extern int nfs4_get_referral_tree(struct fs_context *);
554
555/* nfs4sysctl.c */
556#ifdef CONFIG_SYSCTL
557int nfs4_register_sysctl(void);
558void nfs4_unregister_sysctl(void);
559#else
560static inline int nfs4_register_sysctl(void)
561{
562 return 0;
563}
564
565static inline void nfs4_unregister_sysctl(void)
566{
567}
568#endif
569
570/* nfs4xdr.c */
571extern const struct rpc_procinfo nfs4_procedures[];
572
573#ifdef CONFIG_NFS_V4_2
574extern const u32 nfs42_maxsetxattr_overhead;
575extern const u32 nfs42_maxgetxattr_overhead;
576extern const u32 nfs42_maxlistxattrs_overhead;
577#endif
578
579struct nfs4_mount_data;
580
581/* callback_xdr.c */
582extern const struct svc_version nfs4_callback_version1;
583extern const struct svc_version nfs4_callback_version4;
584
585static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
586{
587 memcpy(dst->data, src->data, sizeof(dst->data));
588 dst->type = src->type;
589}
590
591static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
592{
593 if (dst->type != src->type)
594 return false;
595 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
596}
597
598static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
599{
600 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
601}
602
603static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
604{
605 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
606}
607
608static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
609{
610 u32 seq1 = be32_to_cpu(s1->seqid);
611 u32 seq2 = be32_to_cpu(s2->seqid);
612
613 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
614}
615
616static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
617{
618 return nfs4_stateid_match_other(dst, src) &&
619 !(src->seqid && nfs4_stateid_is_newer(dst, src));
620}
621
622static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
623{
624 u32 seqid = be32_to_cpu(s1->seqid);
625
626 if (++seqid == 0)
627 ++seqid;
628 s1->seqid = cpu_to_be32(seqid);
629}
630
631static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
632{
633 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
634}
635
636static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
637 const nfs4_stateid *stateid)
638{
639 return test_bit(NFS_OPEN_STATE, &state->flags) &&
640 nfs4_stateid_match_other(&state->open_stateid, stateid);
641}
642
643/* nfs42xattr.c */
644#ifdef CONFIG_NFS_V4_2
645extern int __init nfs4_xattr_cache_init(void);
646extern void nfs4_xattr_cache_exit(void);
647extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
648 const char *buf, struct page **pages,
649 ssize_t buflen);
650extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
651extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
652 char *buf, ssize_t buflen);
653extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
654 ssize_t buflen);
655extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
656 ssize_t buflen);
657extern void nfs4_xattr_cache_zap(struct inode *inode);
658#else
659static inline void nfs4_xattr_cache_zap(struct inode *inode)
660{
661}
662#endif /* CONFIG_NFS_V4_2 */
663
664#else /* CONFIG_NFS_V4 */
665
666#define nfs4_close_state(a, b) do { } while (0)
667#define nfs4_close_sync(a, b) do { } while (0)
668#define nfs4_state_protect(a, b, c, d) do { } while (0)
669#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
670
671
672#endif /* CONFIG_NFS_V4 */
673#endif /* __LINUX_FS_NFS_NFS4_FS.H */