]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame_incremental - fs/nfs/nfs4_fs.h
projects / mirror_ubuntu-bionic-kernel.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim()
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / nfs4_fs.h
... / ...
CommitLineData
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_DELEGRETURN_RUNNING,
46};
47
48#define NFS4_RENEW_TIMEOUT 0x01
49#define NFS4_RENEW_DELEGATION_CB 0x02
50
51struct nfs_seqid_counter;
52struct nfs4_minor_version_ops {
53 u32 minor_version;
54 unsigned init_caps;
55
56 int (*init_client)(struct nfs_client *);
57 void (*shutdown_client)(struct nfs_client *);
58 bool (*match_stateid)(const nfs4_stateid *,
59 const nfs4_stateid *);
60 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
61 struct nfs_fsinfo *);
62 void (*free_lock_state)(struct nfs_server *,
63 struct nfs4_lock_state *);
64 int (*test_and_free_expired)(struct nfs_server *,
65 nfs4_stateid *, struct rpc_cred *);
66 struct nfs_seqid *
67 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
68 int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
69 const struct rpc_call_ops *call_sync_ops;
70 const struct nfs4_state_recovery_ops *reboot_recovery_ops;
71 const struct nfs4_state_recovery_ops *nograce_recovery_ops;
72 const struct nfs4_state_maintenance_ops *state_renewal_ops;
73 const struct nfs4_mig_recovery_ops *mig_recovery_ops;
74};
75
76#define NFS_SEQID_CONFIRMED 1
77struct nfs_seqid_counter {
78 ktime_t create_time;
79 int owner_id;
80 int flags;
81 u32 counter;
82 spinlock_t lock; /* Protects the list */
83 struct list_head list; /* Defines sequence of RPC calls */
84 struct rpc_wait_queue wait; /* RPC call delay queue */
85};
86
87struct nfs_seqid {
88 struct nfs_seqid_counter *sequence;
89 struct list_head list;
90 struct rpc_task *task;
91};
92
93static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
94{
95 if (seqid_mutating_err(-status))
96 seqid->flags |= NFS_SEQID_CONFIRMED;
97}
98
99/*
100 * NFS4 state_owners and lock_owners are simply labels for ordered
101 * sequences of RPC calls. Their sole purpose is to provide once-only
102 * semantics by allowing the server to identify replayed requests.
103 */
104struct nfs4_state_owner {
105 struct nfs_server *so_server;
106 struct list_head so_lru;
107 unsigned long so_expires;
108 struct rb_node so_server_node;
109
110 struct rpc_cred *so_cred; /* Associated cred */
111
112 spinlock_t so_lock;
113 atomic_t so_count;
114 unsigned long so_flags;
115 struct list_head so_states;
116 struct nfs_seqid_counter so_seqid;
117 seqcount_t so_reclaim_seqcount;
118 struct mutex so_delegreturn_mutex;
119};
120
121enum {
122 NFS_OWNER_RECLAIM_REBOOT,
123 NFS_OWNER_RECLAIM_NOGRACE
124};
125
126#define NFS_LOCK_NEW 0
127#define NFS_LOCK_RECLAIM 1
128#define NFS_LOCK_EXPIRED 2
129
130/*
131 * struct nfs4_state maintains the client-side state for a given
132 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
133 *
134 * OPEN:
135 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
136 * we need to know how many files are open for reading or writing on a
137 * given inode. This information too is stored here.
138 *
139 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
140 */
141
142struct nfs4_lock_state {
143 struct list_head ls_locks; /* Other lock stateids */
144 struct nfs4_state * ls_state; /* Pointer to open state */
145#define NFS_LOCK_INITIALIZED 0
146#define NFS_LOCK_LOST 1
147 unsigned long ls_flags;
148 struct nfs_seqid_counter ls_seqid;
149 nfs4_stateid ls_stateid;
150 refcount_t ls_count;
151 fl_owner_t ls_owner;
152};
153
154/* bits for nfs4_state->flags */
155enum {
156 LK_STATE_IN_USE,
157 NFS_DELEGATED_STATE, /* Current stateid is delegation */
158 NFS_OPEN_STATE, /* OPEN stateid is set */
159 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
160 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
161 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */
162 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */
163 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */
164 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */
165 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */
166 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */
167 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
168};
169
170struct nfs4_state {
171 struct list_head open_states; /* List of states for the same state_owner */
172 struct list_head inode_states; /* List of states for the same inode */
173 struct list_head lock_states; /* List of subservient lock stateids */
174
175 struct nfs4_state_owner *owner; /* Pointer to the open owner */
176 struct inode *inode; /* Pointer to the inode */
177
178 unsigned long flags; /* Do we hold any locks? */
179 spinlock_t state_lock; /* Protects the lock_states list */
180
181 seqlock_t seqlock; /* Protects the stateid/open_stateid */
182 nfs4_stateid stateid; /* Current stateid: may be delegation */
183 nfs4_stateid open_stateid; /* OPEN stateid */
184
185 /* The following 3 fields are protected by owner->so_lock */
186 unsigned int n_rdonly; /* Number of read-only references */
187 unsigned int n_wronly; /* Number of write-only references */
188 unsigned int n_rdwr; /* Number of read/write references */
189 fmode_t state; /* State on the server (R,W, or RW) */
190 atomic_t count;
191
192 wait_queue_head_t waitq;
193};
194
195
196struct nfs4_exception {
197 struct nfs4_state *state;
198 struct inode *inode;
199 nfs4_stateid *stateid;
200 long timeout;
201 unsigned char delay : 1,
202 recovering : 1,
203 retry : 1;
204};
205
206struct nfs4_state_recovery_ops {
207 int owner_flag_bit;
208 int state_flag_bit;
209 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
210 int (*recover_lock)(struct nfs4_state *, struct file_lock *);
211 int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
212 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
213 int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
214 struct rpc_cred *);
215};
216
217struct nfs4_add_xprt_data {
218 struct nfs_client *clp;
219 struct rpc_cred *cred;
220};
221
222struct nfs4_state_maintenance_ops {
223 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
224 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
225 int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
226};
227
228struct nfs4_mig_recovery_ops {
229 int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
230 struct page *, struct rpc_cred *);
231 int (*fsid_present)(struct inode *, struct rpc_cred *);
232};
233
234extern const struct dentry_operations nfs4_dentry_operations;
235
236/* dir.c */
237int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
238 unsigned, umode_t, int *);
239
240/* super.c */
241extern struct file_system_type nfs4_fs_type;
242
243/* nfs4namespace.c */
244struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
245 const struct qstr *);
246struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
247 struct nfs_fh *, struct nfs_fattr *);
248int nfs4_replace_transport(struct nfs_server *server,
249 const struct nfs4_fs_locations *locations);
250
251/* nfs4proc.c */
252extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
253extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
254 struct rpc_message *, struct nfs4_sequence_args *,
255 struct nfs4_sequence_res *, int);
256extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int);
257extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
258extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
259extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
260extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
261extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
262extern int nfs4_destroy_clientid(struct nfs_client *clp);
263extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
264extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
265extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
266extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
267extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
268 struct nfs4_fs_locations *, struct page *);
269extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
270 struct page *page, struct rpc_cred *);
271extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
272extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
273 struct nfs_fh *, struct nfs_fattr *);
274extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
275extern const struct xattr_handler *nfs4_xattr_handlers[];
276extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
277 const struct nfs_open_context *ctx,
278 const struct nfs_lock_context *l_ctx,
279 fmode_t fmode);
280
281#if defined(CONFIG_NFS_V4_1)
282extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
283extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
284extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
285extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
286 struct nfs_fsinfo *fsinfo);
287extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
288 bool sync);
289extern int nfs4_detect_session_trunking(struct nfs_client *clp,
290 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
291
292static inline bool
293is_ds_only_client(struct nfs_client *clp)
294{
295 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
296 EXCHGID4_FLAG_USE_PNFS_DS;
297}
298
299static inline bool
300is_ds_client(struct nfs_client *clp)
301{
302 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
303}
304
305static inline bool
306_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
307 struct rpc_clnt **clntp, struct rpc_message *msg)
308{
309 struct rpc_cred *newcred = NULL;
310 rpc_authflavor_t flavor;
311
312 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
313 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
314 /* Using machine creds for cleanup operations
315 * is only relevent if the client credentials
316 * might expire. So don't bother for
317 * RPC_AUTH_UNIX. If file was only exported to
318 * sec=sys, the PUTFH would fail anyway.
319 */
320 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
321 return false;
322 }
323 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
324 spin_lock(&clp->cl_lock);
325 if (clp->cl_machine_cred != NULL)
326 /* don't call get_rpccred on the machine cred -
327 * a reference will be held for life of clp */
328 newcred = clp->cl_machine_cred;
329 spin_unlock(&clp->cl_lock);
330 msg->rpc_cred = newcred;
331
332 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
333 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
334 flavor != RPC_AUTH_GSS_KRB5P);
335 *clntp = clp->cl_rpcclient;
336
337 return true;
338 }
339 return false;
340}
341
342/*
343 * Function responsible for determining if an rpc_message should use the
344 * machine cred under SP4_MACH_CRED and if so switching the credential and
345 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
346 * Should be called before rpc_call_sync/rpc_call_async.
347 */
348static inline void
349nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
350 struct rpc_clnt **clntp, struct rpc_message *msg)
351{
352 _nfs4_state_protect(clp, sp4_mode, clntp, msg);
353}
354
355/*
356 * Special wrapper to nfs4_state_protect for write.
357 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
358 * that use machine cred use NFS_FILE_SYNC.
359 */
360static inline void
361nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
362 struct rpc_message *msg, struct nfs_pgio_header *hdr)
363{
364 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
365 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
366 hdr->args.stable = NFS_FILE_SYNC;
367}
368#else /* CONFIG_NFS_v4_1 */
369static inline bool
370is_ds_only_client(struct nfs_client *clp)
371{
372 return false;
373}
374
375static inline bool
376is_ds_client(struct nfs_client *clp)
377{
378 return false;
379}
380
381static inline void
382nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
383 struct rpc_clnt **clntp, struct rpc_message *msg)
384{
385}
386
387static inline void
388nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
389 struct rpc_message *msg, struct nfs_pgio_header *hdr)
390{
391}
392#endif /* CONFIG_NFS_V4_1 */
393
394extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
395
396extern const u32 nfs4_fattr_bitmap[3];
397extern const u32 nfs4_statfs_bitmap[3];
398extern const u32 nfs4_pathconf_bitmap[3];
399extern const u32 nfs4_fsinfo_bitmap[3];
400extern const u32 nfs4_fs_locations_bitmap[3];
401
402void nfs40_shutdown_client(struct nfs_client *);
403void nfs41_shutdown_client(struct nfs_client *);
404int nfs40_init_client(struct nfs_client *);
405int nfs41_init_client(struct nfs_client *);
406void nfs4_free_client(struct nfs_client *);
407
408struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
409
410/* nfs4renewd.c */
411extern void nfs4_schedule_state_renewal(struct nfs_client *);
412extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
413extern void nfs4_kill_renewd(struct nfs_client *);
414extern void nfs4_renew_state(struct work_struct *);
415extern void nfs4_set_lease_period(struct nfs_client *clp,
416 unsigned long lease,
417 unsigned long lastrenewed);
418
419
420/* nfs4state.c */
421struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
422struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
423struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
424int nfs4_discover_server_trunking(struct nfs_client *clp,
425 struct nfs_client **);
426int nfs40_discover_server_trunking(struct nfs_client *clp,
427 struct nfs_client **, struct rpc_cred *);
428#if defined(CONFIG_NFS_V4_1)
429int nfs41_discover_server_trunking(struct nfs_client *clp,
430 struct nfs_client **, struct rpc_cred *);
431extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
432extern void nfs41_notify_server(struct nfs_client *);
433#else
434static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
435{
436}
437#endif /* CONFIG_NFS_V4_1 */
438
439extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
440extern void nfs4_put_state_owner(struct nfs4_state_owner *);
441extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
442extern void nfs4_free_state_owners(struct list_head *head);
443extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
444extern void nfs4_put_open_state(struct nfs4_state *);
445extern void nfs4_close_state(struct nfs4_state *, fmode_t);
446extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
447extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
448extern void nfs_inode_find_state_and_recover(struct inode *inode,
449 const nfs4_stateid *stateid);
450extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
451extern void nfs4_schedule_lease_recovery(struct nfs_client *);
452extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
453extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
454extern void nfs4_schedule_state_manager(struct nfs_client *);
455extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
456extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
457extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
458extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
459extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
460extern void nfs41_handle_server_scope(struct nfs_client *,
461 struct nfs41_server_scope **);
462extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
463extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
464extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
465 const struct nfs_lock_context *, nfs4_stateid *,
466 struct rpc_cred **);
467extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
468 struct nfs4_state *state);
469extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
470 struct nfs4_state *state);
471
472extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
473extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
474extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
475extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
476extern void nfs_release_seqid(struct nfs_seqid *seqid);
477extern void nfs_free_seqid(struct nfs_seqid *seqid);
478extern int nfs4_setup_sequence(struct nfs_client *client,
479 struct nfs4_sequence_args *args,
480 struct nfs4_sequence_res *res,
481 struct rpc_task *task);
482extern int nfs4_sequence_done(struct rpc_task *task,
483 struct nfs4_sequence_res *res);
484
485extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
486
487extern const nfs4_stateid zero_stateid;
488extern const nfs4_stateid invalid_stateid;
489
490/* nfs4super.c */
491struct nfs_mount_info;
492extern struct nfs_subversion nfs_v4;
493struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
494extern bool nfs4_disable_idmapping;
495extern unsigned short max_session_slots;
496extern unsigned short max_session_cb_slots;
497extern unsigned short send_implementation_id;
498extern bool recover_lost_locks;
499
500#define NFS4_CLIENT_ID_UNIQ_LEN (64)
501extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
502
503/* nfs4sysctl.c */
504#ifdef CONFIG_SYSCTL
505int nfs4_register_sysctl(void);
506void nfs4_unregister_sysctl(void);
507#else
508static inline int nfs4_register_sysctl(void)
509{
510 return 0;
511}
512
513static inline void nfs4_unregister_sysctl(void)
514{
515}
516#endif
517
518/* nfs4xdr.c */
519extern const struct rpc_procinfo nfs4_procedures[];
520
521struct nfs4_mount_data;
522
523/* callback_xdr.c */
524extern const struct svc_version nfs4_callback_version1;
525extern const struct svc_version nfs4_callback_version4;
526
527static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
528{
529 memcpy(dst->data, src->data, sizeof(dst->data));
530 dst->type = src->type;
531}
532
533static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
534{
535 if (dst->type != src->type)
536 return false;
537 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
538}
539
540static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
541{
542 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
543}
544
545static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
546{
547 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
548}
549
550static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
551{
552 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
553}
554
555static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
556 const nfs4_stateid *stateid)
557{
558 return test_bit(NFS_OPEN_STATE, &state->flags) &&
559 nfs4_stateid_match_other(&state->open_stateid, stateid);
560}
561
562#else
563
564#define nfs4_close_state(a, b) do { } while (0)
565#define nfs4_close_sync(a, b) do { } while (0)
566#define nfs4_state_protect(a, b, c, d) do { } while (0)
567#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
568
569#endif /* CONFIG_NFS_V4 */
570#endif /* __LINUX_FS_NFS_NFS4_FS.H */
ubuntu-bionic-kernel mirror