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 27 struct idmap; 28 29 enum 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 }; 45 46 #define NFS4_RENEW_TIMEOUT 0x01 47 #define NFS4_RENEW_DELEGATION_CB 0x02 48 49 struct nfs_seqid_counter; 50 struct nfs4_minor_version_ops { 51 u32 minor_version; 52 unsigned init_caps; 53 54 int (*init_client)(struct nfs_client *); 55 void (*shutdown_client)(struct nfs_client *); 56 bool (*match_stateid)(const nfs4_stateid *, 57 const nfs4_stateid *); 58 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 59 struct nfs_fsinfo *); 60 void (*free_lock_state)(struct nfs_server *, 61 struct nfs4_lock_state *); 62 int (*test_and_free_expired)(struct nfs_server *, 63 nfs4_stateid *, struct rpc_cred *); 64 struct nfs_seqid * 65 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 66 int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *); 67 const struct rpc_call_ops *call_sync_ops; 68 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 69 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 70 const struct nfs4_state_maintenance_ops *state_renewal_ops; 71 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 72 }; 73 74 #define NFS_SEQID_CONFIRMED 1 75 struct nfs_seqid_counter { 76 ktime_t create_time; 77 int owner_id; 78 int flags; 79 u32 counter; 80 spinlock_t lock; /* Protects the list */ 81 struct list_head list; /* Defines sequence of RPC calls */ 82 struct rpc_wait_queue wait; /* RPC call delay queue */ 83 }; 84 85 struct nfs_seqid { 86 struct nfs_seqid_counter *sequence; 87 struct list_head list; 88 struct rpc_task *task; 89 }; 90 91 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 92 { 93 if (seqid_mutating_err(-status)) 94 seqid->flags |= NFS_SEQID_CONFIRMED; 95 } 96 97 /* 98 * NFS4 state_owners and lock_owners are simply labels for ordered 99 * sequences of RPC calls. Their sole purpose is to provide once-only 100 * semantics by allowing the server to identify replayed requests. 101 */ 102 struct nfs4_state_owner { 103 struct nfs_server *so_server; 104 struct list_head so_lru; 105 unsigned long so_expires; 106 struct rb_node so_server_node; 107 108 struct rpc_cred *so_cred; /* Associated cred */ 109 110 spinlock_t so_lock; 111 atomic_t so_count; 112 unsigned long so_flags; 113 struct list_head so_states; 114 struct nfs_seqid_counter so_seqid; 115 seqcount_t so_reclaim_seqcount; 116 struct mutex so_delegreturn_mutex; 117 }; 118 119 enum { 120 NFS_OWNER_RECLAIM_REBOOT, 121 NFS_OWNER_RECLAIM_NOGRACE 122 }; 123 124 #define NFS_LOCK_NEW 0 125 #define NFS_LOCK_RECLAIM 1 126 #define NFS_LOCK_EXPIRED 2 127 128 /* 129 * struct nfs4_state maintains the client-side state for a given 130 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 131 * 132 * OPEN: 133 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 134 * we need to know how many files are open for reading or writing on a 135 * given inode. This information too is stored here. 136 * 137 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 138 */ 139 140 struct nfs4_lock_state { 141 struct list_head ls_locks; /* Other lock stateids */ 142 struct nfs4_state * ls_state; /* Pointer to open state */ 143 #define NFS_LOCK_INITIALIZED 0 144 #define NFS_LOCK_LOST 1 145 unsigned long ls_flags; 146 struct nfs_seqid_counter ls_seqid; 147 nfs4_stateid ls_stateid; 148 refcount_t ls_count; 149 fl_owner_t ls_owner; 150 }; 151 152 /* bits for nfs4_state->flags */ 153 enum { 154 LK_STATE_IN_USE, 155 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 156 NFS_OPEN_STATE, /* OPEN stateid is set */ 157 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 158 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 159 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 160 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 161 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 162 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 163 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 164 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 165 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 166 }; 167 168 struct nfs4_state { 169 struct list_head open_states; /* List of states for the same state_owner */ 170 struct list_head inode_states; /* List of states for the same inode */ 171 struct list_head lock_states; /* List of subservient lock stateids */ 172 173 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 174 struct inode *inode; /* Pointer to the inode */ 175 176 unsigned long flags; /* Do we hold any locks? */ 177 spinlock_t state_lock; /* Protects the lock_states list */ 178 179 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 180 nfs4_stateid stateid; /* Current stateid: may be delegation */ 181 nfs4_stateid open_stateid; /* OPEN stateid */ 182 183 /* The following 3 fields are protected by owner->so_lock */ 184 unsigned int n_rdonly; /* Number of read-only references */ 185 unsigned int n_wronly; /* Number of write-only references */ 186 unsigned int n_rdwr; /* Number of read/write references */ 187 fmode_t state; /* State on the server (R,W, or RW) */ 188 atomic_t count; 189 190 wait_queue_head_t waitq; 191 }; 192 193 194 struct nfs4_exception { 195 struct nfs4_state *state; 196 struct inode *inode; 197 nfs4_stateid *stateid; 198 long timeout; 199 unsigned char delay : 1, 200 recovering : 1, 201 retry : 1; 202 }; 203 204 struct nfs4_state_recovery_ops { 205 int owner_flag_bit; 206 int state_flag_bit; 207 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 208 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 209 int (*establish_clid)(struct nfs_client *, struct rpc_cred *); 210 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *); 211 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 212 struct rpc_cred *); 213 }; 214 215 struct nfs4_opendata { 216 struct kref kref; 217 struct nfs_openargs o_arg; 218 struct nfs_openres o_res; 219 struct nfs_open_confirmargs c_arg; 220 struct nfs_open_confirmres c_res; 221 struct nfs4_string owner_name; 222 struct nfs4_string group_name; 223 struct nfs4_label *a_label; 224 struct nfs_fattr f_attr; 225 struct nfs4_label *f_label; 226 struct dentry *dir; 227 struct dentry *dentry; 228 struct nfs4_state_owner *owner; 229 struct nfs4_state *state; 230 struct iattr attrs; 231 struct nfs4_layoutget *lgp; 232 unsigned long timestamp; 233 bool rpc_done; 234 bool file_created; 235 bool is_recover; 236 bool cancelled; 237 int rpc_status; 238 }; 239 240 struct nfs4_add_xprt_data { 241 struct nfs_client *clp; 242 struct rpc_cred *cred; 243 }; 244 245 struct nfs4_state_maintenance_ops { 246 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned); 247 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *); 248 int (*renew_lease)(struct nfs_client *, struct rpc_cred *); 249 }; 250 251 struct nfs4_mig_recovery_ops { 252 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 253 struct page *, struct rpc_cred *); 254 int (*fsid_present)(struct inode *, struct rpc_cred *); 255 }; 256 257 extern const struct dentry_operations nfs4_dentry_operations; 258 259 /* dir.c */ 260 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 261 unsigned, umode_t, int *); 262 263 /* super.c */ 264 extern struct file_system_type nfs4_fs_type; 265 266 /* nfs4namespace.c */ 267 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 268 const struct qstr *); 269 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *, 270 struct nfs_fh *, struct nfs_fattr *); 271 int nfs4_replace_transport(struct nfs_server *server, 272 const struct nfs4_fs_locations *locations); 273 274 /* nfs4proc.c */ 275 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 276 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 277 struct rpc_message *, struct nfs4_sequence_args *, 278 struct nfs4_sequence_res *, int); 279 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 280 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *); 281 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *); 282 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 283 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred); 284 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred); 285 extern int nfs4_destroy_clientid(struct nfs_client *clp); 286 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *); 287 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *); 288 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 289 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 290 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 291 struct nfs4_fs_locations *, struct page *); 292 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 293 struct page *page, struct rpc_cred *); 294 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *); 295 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *, 296 struct nfs_fh *, struct nfs_fattr *); 297 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 298 extern const struct xattr_handler *nfs4_xattr_handlers[]; 299 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 300 const struct nfs_open_context *ctx, 301 const struct nfs_lock_context *l_ctx, 302 fmode_t fmode); 303 304 #if defined(CONFIG_NFS_V4_1) 305 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 306 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *); 307 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *); 308 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 309 struct nfs_fsinfo *fsinfo); 310 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 311 bool sync); 312 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 313 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 314 315 static inline bool 316 is_ds_only_client(struct nfs_client *clp) 317 { 318 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 319 EXCHGID4_FLAG_USE_PNFS_DS; 320 } 321 322 static inline bool 323 is_ds_client(struct nfs_client *clp) 324 { 325 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 326 } 327 328 static inline bool 329 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 330 struct rpc_clnt **clntp, struct rpc_message *msg) 331 { 332 struct rpc_cred *newcred = NULL; 333 rpc_authflavor_t flavor; 334 335 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 336 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 337 /* Using machine creds for cleanup operations 338 * is only relevent if the client credentials 339 * might expire. So don't bother for 340 * RPC_AUTH_UNIX. If file was only exported to 341 * sec=sys, the PUTFH would fail anyway. 342 */ 343 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 344 return false; 345 } 346 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 347 spin_lock(&clp->cl_lock); 348 if (clp->cl_machine_cred != NULL) 349 /* don't call get_rpccred on the machine cred - 350 * a reference will be held for life of clp */ 351 newcred = clp->cl_machine_cred; 352 spin_unlock(&clp->cl_lock); 353 msg->rpc_cred = newcred; 354 355 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 356 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 357 flavor != RPC_AUTH_GSS_KRB5P); 358 *clntp = clp->cl_rpcclient; 359 360 return true; 361 } 362 return false; 363 } 364 365 /* 366 * Function responsible for determining if an rpc_message should use the 367 * machine cred under SP4_MACH_CRED and if so switching the credential and 368 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 369 * Should be called before rpc_call_sync/rpc_call_async. 370 */ 371 static inline void 372 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 373 struct rpc_clnt **clntp, struct rpc_message *msg) 374 { 375 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 376 } 377 378 /* 379 * Special wrapper to nfs4_state_protect for write. 380 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 381 * that use machine cred use NFS_FILE_SYNC. 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 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 388 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 389 hdr->args.stable = NFS_FILE_SYNC; 390 } 391 #else /* CONFIG_NFS_v4_1 */ 392 static inline bool 393 is_ds_only_client(struct nfs_client *clp) 394 { 395 return false; 396 } 397 398 static inline bool 399 is_ds_client(struct nfs_client *clp) 400 { 401 return false; 402 } 403 404 static inline void 405 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 406 struct rpc_clnt **clntp, struct rpc_message *msg) 407 { 408 } 409 410 static inline void 411 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 412 struct rpc_message *msg, struct nfs_pgio_header *hdr) 413 { 414 } 415 #endif /* CONFIG_NFS_V4_1 */ 416 417 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 418 419 extern const u32 nfs4_fattr_bitmap[3]; 420 extern const u32 nfs4_statfs_bitmap[3]; 421 extern const u32 nfs4_pathconf_bitmap[3]; 422 extern const u32 nfs4_fsinfo_bitmap[3]; 423 extern const u32 nfs4_fs_locations_bitmap[3]; 424 425 void nfs40_shutdown_client(struct nfs_client *); 426 void nfs41_shutdown_client(struct nfs_client *); 427 int nfs40_init_client(struct nfs_client *); 428 int nfs41_init_client(struct nfs_client *); 429 void nfs4_free_client(struct nfs_client *); 430 431 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 432 433 /* nfs4renewd.c */ 434 extern void nfs4_schedule_state_renewal(struct nfs_client *); 435 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 436 extern void nfs4_kill_renewd(struct nfs_client *); 437 extern void nfs4_renew_state(struct work_struct *); 438 extern void nfs4_set_lease_period(struct nfs_client *clp, 439 unsigned long lease, 440 unsigned long lastrenewed); 441 442 443 /* nfs4state.c */ 444 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp); 445 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp); 446 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp); 447 int nfs4_discover_server_trunking(struct nfs_client *clp, 448 struct nfs_client **); 449 int nfs40_discover_server_trunking(struct nfs_client *clp, 450 struct nfs_client **, struct rpc_cred *); 451 #if defined(CONFIG_NFS_V4_1) 452 int nfs41_discover_server_trunking(struct nfs_client *clp, 453 struct nfs_client **, struct rpc_cred *); 454 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 455 extern void nfs41_notify_server(struct nfs_client *); 456 #else 457 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 458 { 459 } 460 #endif /* CONFIG_NFS_V4_1 */ 461 462 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t); 463 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 464 extern void nfs4_purge_state_owners(struct nfs_server *); 465 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 466 extern void nfs4_put_open_state(struct nfs4_state *); 467 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 468 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 469 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 470 extern void nfs_inode_find_state_and_recover(struct inode *inode, 471 const nfs4_stateid *stateid); 472 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 473 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 474 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 475 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 476 extern void nfs4_schedule_state_manager(struct nfs_client *); 477 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 478 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 479 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 480 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 481 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 482 extern void nfs41_handle_server_scope(struct nfs_client *, 483 struct nfs41_server_scope **); 484 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 485 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 486 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 487 const struct nfs_lock_context *, nfs4_stateid *, 488 struct rpc_cred **); 489 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst, 490 struct nfs4_state *state); 491 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 492 struct nfs4_state *state); 493 494 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 495 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 496 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 497 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 498 extern void nfs_release_seqid(struct nfs_seqid *seqid); 499 extern void nfs_free_seqid(struct nfs_seqid *seqid); 500 extern int nfs4_setup_sequence(struct nfs_client *client, 501 struct nfs4_sequence_args *args, 502 struct nfs4_sequence_res *res, 503 struct rpc_task *task); 504 extern int nfs4_sequence_done(struct rpc_task *task, 505 struct nfs4_sequence_res *res); 506 507 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 508 509 extern const nfs4_stateid zero_stateid; 510 extern const nfs4_stateid invalid_stateid; 511 512 /* nfs4super.c */ 513 struct nfs_mount_info; 514 extern struct nfs_subversion nfs_v4; 515 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *); 516 extern bool nfs4_disable_idmapping; 517 extern unsigned short max_session_slots; 518 extern unsigned short max_session_cb_slots; 519 extern unsigned short send_implementation_id; 520 extern bool recover_lost_locks; 521 522 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 523 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 524 525 /* nfs4sysctl.c */ 526 #ifdef CONFIG_SYSCTL 527 int nfs4_register_sysctl(void); 528 void nfs4_unregister_sysctl(void); 529 #else 530 static inline int nfs4_register_sysctl(void) 531 { 532 return 0; 533 } 534 535 static inline void nfs4_unregister_sysctl(void) 536 { 537 } 538 #endif 539 540 /* nfs4xdr.c */ 541 extern const struct rpc_procinfo nfs4_procedures[]; 542 543 struct nfs4_mount_data; 544 545 /* callback_xdr.c */ 546 extern const struct svc_version nfs4_callback_version1; 547 extern const struct svc_version nfs4_callback_version4; 548 549 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 550 { 551 memcpy(dst->data, src->data, sizeof(dst->data)); 552 dst->type = src->type; 553 } 554 555 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 556 { 557 if (dst->type != src->type) 558 return false; 559 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 560 } 561 562 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 563 { 564 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 565 } 566 567 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 568 { 569 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 570 } 571 572 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 573 { 574 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 575 } 576 577 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 578 const nfs4_stateid *stateid) 579 { 580 return test_bit(NFS_OPEN_STATE, &state->flags) && 581 nfs4_stateid_match_other(&state->open_stateid, stateid); 582 } 583 584 #else 585 586 #define nfs4_close_state(a, b) do { } while (0) 587 #define nfs4_close_sync(a, b) do { } while (0) 588 #define nfs4_state_protect(a, b, c, d) do { } while (0) 589 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 590 591 #endif /* CONFIG_NFS_V4 */ 592 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 593