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 26 struct idmap; 27 28 enum 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 NFS4CLNT_DELEGATION_EXPIRED, 43 }; 44 45 #define NFS4_RENEW_TIMEOUT 0x01 46 #define NFS4_RENEW_DELEGATION_CB 0x02 47 48 struct nfs_seqid_counter; 49 struct nfs4_minor_version_ops { 50 u32 minor_version; 51 unsigned init_caps; 52 53 int (*init_client)(struct nfs_client *); 54 void (*shutdown_client)(struct nfs_client *); 55 bool (*match_stateid)(const nfs4_stateid *, 56 const nfs4_stateid *); 57 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 58 struct nfs_fsinfo *); 59 void (*free_lock_state)(struct nfs_server *, 60 struct nfs4_lock_state *); 61 int (*test_and_free_expired)(struct nfs_server *, 62 nfs4_stateid *, struct rpc_cred *); 63 struct nfs_seqid * 64 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 65 int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *); 66 const struct rpc_call_ops *call_sync_ops; 67 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 68 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 69 const struct nfs4_state_maintenance_ops *state_renewal_ops; 70 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 71 }; 72 73 #define NFS_SEQID_CONFIRMED 1 74 struct nfs_seqid_counter { 75 ktime_t create_time; 76 int owner_id; 77 int flags; 78 u32 counter; 79 spinlock_t lock; /* Protects the list */ 80 struct list_head list; /* Defines sequence of RPC calls */ 81 struct rpc_wait_queue wait; /* RPC call delay queue */ 82 }; 83 84 struct nfs_seqid { 85 struct nfs_seqid_counter *sequence; 86 struct list_head list; 87 struct rpc_task *task; 88 }; 89 90 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 91 { 92 if (seqid_mutating_err(-status)) 93 seqid->flags |= NFS_SEQID_CONFIRMED; 94 } 95 96 /* 97 * NFS4 state_owners and lock_owners are simply labels for ordered 98 * sequences of RPC calls. Their sole purpose is to provide once-only 99 * semantics by allowing the server to identify replayed requests. 100 */ 101 struct nfs4_state_owner { 102 struct nfs_server *so_server; 103 struct list_head so_lru; 104 unsigned long so_expires; 105 struct rb_node so_server_node; 106 107 struct rpc_cred *so_cred; /* Associated cred */ 108 109 spinlock_t so_lock; 110 atomic_t so_count; 111 unsigned long so_flags; 112 struct list_head so_states; 113 struct nfs_seqid_counter so_seqid; 114 seqcount_t so_reclaim_seqcount; 115 struct mutex so_delegreturn_mutex; 116 }; 117 118 enum { 119 NFS_OWNER_RECLAIM_REBOOT, 120 NFS_OWNER_RECLAIM_NOGRACE 121 }; 122 123 #define NFS_LOCK_NEW 0 124 #define NFS_LOCK_RECLAIM 1 125 #define NFS_LOCK_EXPIRED 2 126 127 /* 128 * struct nfs4_state maintains the client-side state for a given 129 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 130 * 131 * OPEN: 132 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 133 * we need to know how many files are open for reading or writing on a 134 * given inode. This information too is stored here. 135 * 136 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 137 */ 138 139 struct nfs4_lock_state { 140 struct list_head ls_locks; /* Other lock stateids */ 141 struct nfs4_state * ls_state; /* Pointer to open state */ 142 #define NFS_LOCK_INITIALIZED 0 143 #define NFS_LOCK_LOST 1 144 unsigned long ls_flags; 145 struct nfs_seqid_counter ls_seqid; 146 nfs4_stateid ls_stateid; 147 atomic_t ls_count; 148 fl_owner_t ls_owner; 149 }; 150 151 /* bits for nfs4_state->flags */ 152 enum { 153 LK_STATE_IN_USE, 154 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 155 NFS_OPEN_STATE, /* OPEN stateid is set */ 156 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 157 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 158 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 159 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 160 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 161 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 162 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 163 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 164 }; 165 166 struct nfs4_state { 167 struct list_head open_states; /* List of states for the same state_owner */ 168 struct list_head inode_states; /* List of states for the same inode */ 169 struct list_head lock_states; /* List of subservient lock stateids */ 170 171 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 172 struct inode *inode; /* Pointer to the inode */ 173 174 unsigned long flags; /* Do we hold any locks? */ 175 spinlock_t state_lock; /* Protects the lock_states list */ 176 177 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 178 nfs4_stateid stateid; /* Current stateid: may be delegation */ 179 nfs4_stateid open_stateid; /* OPEN stateid */ 180 181 /* The following 3 fields are protected by owner->so_lock */ 182 unsigned int n_rdonly; /* Number of read-only references */ 183 unsigned int n_wronly; /* Number of write-only references */ 184 unsigned int n_rdwr; /* Number of read/write references */ 185 fmode_t state; /* State on the server (R,W, or RW) */ 186 atomic_t count; 187 }; 188 189 190 struct nfs4_exception { 191 struct nfs4_state *state; 192 struct inode *inode; 193 nfs4_stateid *stateid; 194 long timeout; 195 unsigned char delay : 1, 196 recovering : 1, 197 retry : 1; 198 }; 199 200 struct 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 }; 210 211 struct nfs4_add_xprt_data { 212 struct nfs_client *clp; 213 struct rpc_cred *cred; 214 }; 215 216 struct nfs4_state_maintenance_ops { 217 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned); 218 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *); 219 int (*renew_lease)(struct nfs_client *, struct rpc_cred *); 220 }; 221 222 struct nfs4_mig_recovery_ops { 223 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 224 struct page *, struct rpc_cred *); 225 int (*fsid_present)(struct inode *, struct rpc_cred *); 226 }; 227 228 extern const struct dentry_operations nfs4_dentry_operations; 229 230 /* dir.c */ 231 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 232 unsigned, umode_t, int *); 233 234 /* super.c */ 235 extern struct file_system_type nfs4_fs_type; 236 237 /* nfs4namespace.c */ 238 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 239 const struct qstr *); 240 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *, 241 struct nfs_fh *, struct nfs_fattr *); 242 int nfs4_replace_transport(struct nfs_server *server, 243 const struct nfs4_fs_locations *locations); 244 245 /* nfs4proc.c */ 246 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 247 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 248 struct rpc_message *, struct nfs4_sequence_args *, 249 struct nfs4_sequence_res *, int); 250 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int); 251 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *); 252 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *); 253 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 254 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred); 255 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred); 256 extern int nfs4_destroy_clientid(struct nfs_client *clp); 257 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *); 258 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *); 259 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 260 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 261 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 262 struct nfs4_fs_locations *, struct page *); 263 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 264 struct page *page, struct rpc_cred *); 265 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *); 266 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *, 267 struct nfs_fh *, struct nfs_fattr *); 268 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 269 extern const struct xattr_handler *nfs4_xattr_handlers[]; 270 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 271 const struct nfs_open_context *ctx, 272 const struct nfs_lock_context *l_ctx, 273 fmode_t fmode); 274 275 #if defined(CONFIG_NFS_V4_1) 276 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server) 277 { 278 return server->nfs_client->cl_session; 279 } 280 281 extern int nfs41_setup_sequence(struct nfs4_session *session, 282 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res, 283 struct rpc_task *task); 284 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 285 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *); 286 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *); 287 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 288 struct nfs_fsinfo *fsinfo); 289 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 290 bool sync); 291 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 292 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 293 294 static inline bool 295 is_ds_only_client(struct nfs_client *clp) 296 { 297 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 298 EXCHGID4_FLAG_USE_PNFS_DS; 299 } 300 301 static inline bool 302 is_ds_client(struct nfs_client *clp) 303 { 304 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 305 } 306 307 static inline bool 308 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 309 struct rpc_clnt **clntp, struct rpc_message *msg) 310 { 311 struct rpc_cred *newcred = NULL; 312 rpc_authflavor_t flavor; 313 314 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 315 spin_lock(&clp->cl_lock); 316 if (clp->cl_machine_cred != NULL) 317 /* don't call get_rpccred on the machine cred - 318 * a reference will be held for life of clp */ 319 newcred = clp->cl_machine_cred; 320 spin_unlock(&clp->cl_lock); 321 msg->rpc_cred = newcred; 322 323 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 324 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 325 flavor != RPC_AUTH_GSS_KRB5P); 326 *clntp = clp->cl_rpcclient; 327 328 return true; 329 } 330 return false; 331 } 332 333 /* 334 * Function responsible for determining if an rpc_message should use the 335 * machine cred under SP4_MACH_CRED and if so switching the credential and 336 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 337 * Should be called before rpc_call_sync/rpc_call_async. 338 */ 339 static inline void 340 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 341 struct rpc_clnt **clntp, struct rpc_message *msg) 342 { 343 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 344 } 345 346 /* 347 * Special wrapper to nfs4_state_protect for write. 348 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 349 * that use machine cred use NFS_FILE_SYNC. 350 */ 351 static inline void 352 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 353 struct rpc_message *msg, struct nfs_pgio_header *hdr) 354 { 355 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 356 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 357 hdr->args.stable = NFS_FILE_SYNC; 358 } 359 #else /* CONFIG_NFS_v4_1 */ 360 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server) 361 { 362 return NULL; 363 } 364 365 static inline bool 366 is_ds_only_client(struct nfs_client *clp) 367 { 368 return false; 369 } 370 371 static inline bool 372 is_ds_client(struct nfs_client *clp) 373 { 374 return false; 375 } 376 377 static inline void 378 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 379 struct rpc_clnt **clntp, struct rpc_message *msg) 380 { 381 } 382 383 static inline void 384 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 385 struct rpc_message *msg, struct nfs_pgio_header *hdr) 386 { 387 } 388 #endif /* CONFIG_NFS_V4_1 */ 389 390 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 391 392 extern const u32 nfs4_fattr_bitmap[3]; 393 extern const u32 nfs4_statfs_bitmap[3]; 394 extern const u32 nfs4_pathconf_bitmap[3]; 395 extern const u32 nfs4_fsinfo_bitmap[3]; 396 extern const u32 nfs4_fs_locations_bitmap[3]; 397 398 void nfs40_shutdown_client(struct nfs_client *); 399 void nfs41_shutdown_client(struct nfs_client *); 400 int nfs40_init_client(struct nfs_client *); 401 int nfs41_init_client(struct nfs_client *); 402 void nfs4_free_client(struct nfs_client *); 403 404 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 405 406 /* nfs4renewd.c */ 407 extern void nfs4_schedule_state_renewal(struct nfs_client *); 408 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 409 extern void nfs4_kill_renewd(struct nfs_client *); 410 extern void nfs4_renew_state(struct work_struct *); 411 extern void nfs4_set_lease_period(struct nfs_client *clp, 412 unsigned long lease, 413 unsigned long lastrenewed); 414 415 416 /* nfs4state.c */ 417 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp); 418 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp); 419 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp); 420 int nfs4_discover_server_trunking(struct nfs_client *clp, 421 struct nfs_client **); 422 int nfs40_discover_server_trunking(struct nfs_client *clp, 423 struct nfs_client **, struct rpc_cred *); 424 #if defined(CONFIG_NFS_V4_1) 425 int nfs41_discover_server_trunking(struct nfs_client *clp, 426 struct nfs_client **, struct rpc_cred *); 427 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 428 extern void nfs41_notify_server(struct nfs_client *); 429 #else 430 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 431 { 432 } 433 #endif /* CONFIG_NFS_V4_1 */ 434 435 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t); 436 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 437 extern void nfs4_purge_state_owners(struct nfs_server *); 438 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 439 extern void nfs4_put_open_state(struct nfs4_state *); 440 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 441 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 442 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 443 extern void nfs_inode_find_state_and_recover(struct inode *inode, 444 const nfs4_stateid *stateid); 445 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 446 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 447 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 448 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 449 extern void nfs4_schedule_state_manager(struct nfs_client *); 450 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 451 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 452 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 453 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 454 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 455 extern void nfs41_handle_server_scope(struct nfs_client *, 456 struct nfs41_server_scope **); 457 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 458 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 459 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 460 const struct nfs_lockowner *, nfs4_stateid *, 461 struct rpc_cred **); 462 463 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 464 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 465 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 466 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 467 extern void nfs_release_seqid(struct nfs_seqid *seqid); 468 extern void nfs_free_seqid(struct nfs_seqid *seqid); 469 extern int nfs40_setup_sequence(struct nfs4_slot_table *tbl, 470 struct nfs4_sequence_args *args, 471 struct nfs4_sequence_res *res, 472 struct rpc_task *task); 473 extern int nfs4_sequence_done(struct rpc_task *task, 474 struct nfs4_sequence_res *res); 475 476 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 477 478 extern const nfs4_stateid zero_stateid; 479 480 /* nfs4super.c */ 481 struct nfs_mount_info; 482 extern struct nfs_subversion nfs_v4; 483 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *); 484 extern bool nfs4_disable_idmapping; 485 extern unsigned short max_session_slots; 486 extern unsigned short max_session_cb_slots; 487 extern unsigned short send_implementation_id; 488 extern bool recover_lost_locks; 489 490 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 491 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 492 493 /* nfs4sysctl.c */ 494 #ifdef CONFIG_SYSCTL 495 int nfs4_register_sysctl(void); 496 void nfs4_unregister_sysctl(void); 497 #else 498 static inline int nfs4_register_sysctl(void) 499 { 500 return 0; 501 } 502 503 static inline void nfs4_unregister_sysctl(void) 504 { 505 } 506 #endif 507 508 /* nfs4xdr.c */ 509 extern struct rpc_procinfo nfs4_procedures[]; 510 511 struct nfs4_mount_data; 512 513 /* callback_xdr.c */ 514 extern struct svc_version nfs4_callback_version1; 515 extern struct svc_version nfs4_callback_version4; 516 517 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 518 { 519 memcpy(dst->data, src->data, sizeof(dst->data)); 520 dst->type = src->type; 521 } 522 523 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 524 { 525 if (dst->type != src->type) 526 return false; 527 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 528 } 529 530 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 531 { 532 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 533 } 534 535 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 536 { 537 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 538 } 539 540 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 541 { 542 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 543 } 544 545 #else 546 547 #define nfs4_close_state(a, b) do { } while (0) 548 #define nfs4_close_sync(a, b) do { } while (0) 549 #define nfs4_state_protect(a, b, c, d) do { } while (0) 550 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 551 552 #endif /* CONFIG_NFS_V4 */ 553 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 554