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 NFS4CLNT_RUN_MANAGER, 45 NFS4CLNT_DELEGRETURN_RUNNING, 46 }; 47 48 #define NFS4_RENEW_TIMEOUT 0x01 49 #define NFS4_RENEW_DELEGATION_CB 0x02 50 51 struct nfs_seqid_counter; 52 struct 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 *, const struct cred *); 66 struct nfs_seqid * 67 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 68 void (*session_trunk)(struct rpc_clnt *clnt, 69 struct rpc_xprt *xprt, void *data); 70 const struct rpc_call_ops *call_sync_ops; 71 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 72 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 73 const struct nfs4_state_maintenance_ops *state_renewal_ops; 74 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 75 }; 76 77 #define NFS_SEQID_CONFIRMED 1 78 struct nfs_seqid_counter { 79 ktime_t create_time; 80 int owner_id; 81 int flags; 82 u32 counter; 83 spinlock_t lock; /* Protects the list */ 84 struct list_head list; /* Defines sequence of RPC calls */ 85 struct rpc_wait_queue wait; /* RPC call delay queue */ 86 }; 87 88 struct nfs_seqid { 89 struct nfs_seqid_counter *sequence; 90 struct list_head list; 91 struct rpc_task *task; 92 }; 93 94 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 95 { 96 if (seqid_mutating_err(-status)) 97 seqid->flags |= NFS_SEQID_CONFIRMED; 98 } 99 100 /* 101 * NFS4 state_owners and lock_owners are simply labels for ordered 102 * sequences of RPC calls. Their sole purpose is to provide once-only 103 * semantics by allowing the server to identify replayed requests. 104 */ 105 struct nfs4_state_owner { 106 struct nfs_server *so_server; 107 struct list_head so_lru; 108 unsigned long so_expires; 109 struct rb_node so_server_node; 110 111 const struct cred *so_cred; /* Associated cred */ 112 113 spinlock_t so_lock; 114 atomic_t so_count; 115 unsigned long so_flags; 116 struct list_head so_states; 117 struct nfs_seqid_counter so_seqid; 118 seqcount_t so_reclaim_seqcount; 119 struct mutex so_delegreturn_mutex; 120 }; 121 122 enum { 123 NFS_OWNER_RECLAIM_REBOOT, 124 NFS_OWNER_RECLAIM_NOGRACE 125 }; 126 127 #define NFS_LOCK_NEW 0 128 #define NFS_LOCK_RECLAIM 1 129 #define NFS_LOCK_EXPIRED 2 130 131 /* 132 * struct nfs4_state maintains the client-side state for a given 133 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 134 * 135 * OPEN: 136 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 137 * we need to know how many files are open for reading or writing on a 138 * given inode. This information too is stored here. 139 * 140 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 141 */ 142 143 struct 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 refcount_t ls_count; 152 fl_owner_t ls_owner; 153 }; 154 155 /* bits for nfs4_state->flags */ 156 enum { 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 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 168 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 169 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 170 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 171 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 172 }; 173 174 struct nfs4_state { 175 struct list_head open_states; /* List of states for the same state_owner */ 176 struct list_head inode_states; /* List of states for the same inode */ 177 struct list_head lock_states; /* List of subservient lock stateids */ 178 179 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 180 struct inode *inode; /* Pointer to the inode */ 181 182 unsigned long flags; /* Do we hold any locks? */ 183 spinlock_t state_lock; /* Protects the lock_states list */ 184 185 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 186 nfs4_stateid stateid; /* Current stateid: may be delegation */ 187 nfs4_stateid open_stateid; /* OPEN stateid */ 188 189 /* The following 3 fields are protected by owner->so_lock */ 190 unsigned int n_rdonly; /* Number of read-only references */ 191 unsigned int n_wronly; /* Number of write-only references */ 192 unsigned int n_rdwr; /* Number of read/write references */ 193 fmode_t state; /* State on the server (R,W, or RW) */ 194 refcount_t count; 195 196 wait_queue_head_t waitq; 197 struct rcu_head rcu_head; 198 }; 199 200 201 struct nfs4_exception { 202 struct nfs4_state *state; 203 struct inode *inode; 204 nfs4_stateid *stateid; 205 long timeout; 206 unsigned char delay : 1, 207 recovering : 1, 208 retry : 1; 209 bool interruptible; 210 }; 211 212 struct nfs4_state_recovery_ops { 213 int owner_flag_bit; 214 int state_flag_bit; 215 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 216 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 217 int (*establish_clid)(struct nfs_client *, const struct cred *); 218 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 219 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 220 const struct cred *); 221 }; 222 223 struct nfs4_opendata { 224 struct kref kref; 225 struct nfs_openargs o_arg; 226 struct nfs_openres o_res; 227 struct nfs_open_confirmargs c_arg; 228 struct nfs_open_confirmres c_res; 229 struct nfs4_string owner_name; 230 struct nfs4_string group_name; 231 struct nfs4_label *a_label; 232 struct nfs_fattr f_attr; 233 struct nfs4_label *f_label; 234 struct dentry *dir; 235 struct dentry *dentry; 236 struct nfs4_state_owner *owner; 237 struct nfs4_state *state; 238 struct iattr attrs; 239 struct nfs4_layoutget *lgp; 240 unsigned long timestamp; 241 bool rpc_done; 242 bool file_created; 243 bool is_recover; 244 bool cancelled; 245 int rpc_status; 246 }; 247 248 struct nfs4_add_xprt_data { 249 struct nfs_client *clp; 250 const struct cred *cred; 251 }; 252 253 struct nfs4_state_maintenance_ops { 254 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 255 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 256 int (*renew_lease)(struct nfs_client *, const struct cred *); 257 }; 258 259 struct nfs4_mig_recovery_ops { 260 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 261 struct page *, const struct cred *); 262 int (*fsid_present)(struct inode *, const struct cred *); 263 }; 264 265 extern const struct dentry_operations nfs4_dentry_operations; 266 267 /* dir.c */ 268 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 269 unsigned, umode_t); 270 271 /* fs_context.c */ 272 extern struct file_system_type nfs4_fs_type; 273 274 /* nfs4namespace.c */ 275 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 276 const struct qstr *); 277 int nfs4_submount(struct fs_context *, struct nfs_server *); 278 int nfs4_replace_transport(struct nfs_server *server, 279 const struct nfs4_fs_locations *locations); 280 281 /* nfs4proc.c */ 282 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 283 extern int nfs4_async_handle_error(struct rpc_task *task, 284 struct nfs_server *server, 285 struct nfs4_state *state, long *timeout); 286 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 287 struct rpc_message *, struct nfs4_sequence_args *, 288 struct nfs4_sequence_res *, int); 289 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 290 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 291 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 292 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 293 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 294 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 295 extern int nfs4_destroy_clientid(struct nfs_client *clp); 296 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 297 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 298 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 299 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 300 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 301 struct nfs4_fs_locations *, struct page *); 302 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 303 struct page *page, const struct cred *); 304 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 305 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 306 struct dentry *, 307 struct nfs_fh *, 308 struct nfs_fattr *); 309 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 310 extern const struct xattr_handler *nfs4_xattr_handlers[]; 311 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 312 const struct nfs_open_context *ctx, 313 const struct nfs_lock_context *l_ctx, 314 fmode_t fmode); 315 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 316 struct nfs_fattr *fattr, struct nfs4_label *label, 317 struct inode *inode); 318 extern int update_open_stateid(struct nfs4_state *state, 319 const nfs4_stateid *open_stateid, 320 const nfs4_stateid *deleg_stateid, 321 fmode_t fmode); 322 323 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 324 struct nfs_fsinfo *fsinfo); 325 #if defined(CONFIG_NFS_V4_1) 326 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 327 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 328 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 329 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 330 bool sync); 331 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 332 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 333 334 static inline bool 335 is_ds_only_client(struct nfs_client *clp) 336 { 337 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 338 EXCHGID4_FLAG_USE_PNFS_DS; 339 } 340 341 static inline bool 342 is_ds_client(struct nfs_client *clp) 343 { 344 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 345 } 346 347 static inline bool 348 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 349 struct rpc_clnt **clntp, struct rpc_message *msg) 350 { 351 rpc_authflavor_t flavor; 352 353 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 354 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 355 /* Using machine creds for cleanup operations 356 * is only relevent if the client credentials 357 * might expire. So don't bother for 358 * RPC_AUTH_UNIX. If file was only exported to 359 * sec=sys, the PUTFH would fail anyway. 360 */ 361 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 362 return false; 363 } 364 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 365 msg->rpc_cred = rpc_machine_cred(); 366 367 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 368 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 369 flavor != RPC_AUTH_GSS_KRB5P); 370 *clntp = clp->cl_rpcclient; 371 372 return true; 373 } 374 return false; 375 } 376 377 /* 378 * Function responsible for determining if an rpc_message should use the 379 * machine cred under SP4_MACH_CRED and if so switching the credential and 380 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 381 * Should be called before rpc_call_sync/rpc_call_async. 382 */ 383 static inline void 384 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 385 struct rpc_clnt **clntp, struct rpc_message *msg) 386 { 387 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 388 } 389 390 /* 391 * Special wrapper to nfs4_state_protect for write. 392 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 393 * that use machine cred use NFS_FILE_SYNC. 394 */ 395 static inline void 396 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 397 struct rpc_message *msg, struct nfs_pgio_header *hdr) 398 { 399 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 400 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 401 hdr->args.stable = NFS_FILE_SYNC; 402 } 403 #else /* CONFIG_NFS_v4_1 */ 404 static inline bool 405 is_ds_only_client(struct nfs_client *clp) 406 { 407 return false; 408 } 409 410 static inline bool 411 is_ds_client(struct nfs_client *clp) 412 { 413 return false; 414 } 415 416 static inline void 417 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 418 struct rpc_clnt **clntp, struct rpc_message *msg) 419 { 420 } 421 422 static inline void 423 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 424 struct rpc_message *msg, struct nfs_pgio_header *hdr) 425 { 426 } 427 #endif /* CONFIG_NFS_V4_1 */ 428 429 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 430 431 extern const u32 nfs4_fattr_bitmap[3]; 432 extern const u32 nfs4_statfs_bitmap[3]; 433 extern const u32 nfs4_pathconf_bitmap[3]; 434 extern const u32 nfs4_fsinfo_bitmap[3]; 435 extern const u32 nfs4_fs_locations_bitmap[3]; 436 437 void nfs40_shutdown_client(struct nfs_client *); 438 void nfs41_shutdown_client(struct nfs_client *); 439 int nfs40_init_client(struct nfs_client *); 440 int nfs41_init_client(struct nfs_client *); 441 void nfs4_free_client(struct nfs_client *); 442 443 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 444 445 /* nfs4renewd.c */ 446 extern void nfs4_schedule_state_renewal(struct nfs_client *); 447 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 448 extern void nfs4_kill_renewd(struct nfs_client *); 449 extern void nfs4_renew_state(struct work_struct *); 450 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 451 452 453 /* nfs4state.c */ 454 extern const nfs4_stateid current_stateid; 455 456 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 457 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 458 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 459 int nfs4_discover_server_trunking(struct nfs_client *clp, 460 struct nfs_client **); 461 int nfs40_discover_server_trunking(struct nfs_client *clp, 462 struct nfs_client **, const struct cred *); 463 #if defined(CONFIG_NFS_V4_1) 464 int nfs41_discover_server_trunking(struct nfs_client *clp, 465 struct nfs_client **, const struct cred *); 466 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 467 extern void nfs41_notify_server(struct nfs_client *); 468 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 469 struct nfs41_server_owner *o2); 470 #else 471 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 472 { 473 } 474 #endif /* CONFIG_NFS_V4_1 */ 475 476 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 477 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 478 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 479 extern void nfs4_free_state_owners(struct list_head *head); 480 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 481 extern void nfs4_put_open_state(struct nfs4_state *); 482 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 483 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 484 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 485 extern void nfs_inode_find_state_and_recover(struct inode *inode, 486 const nfs4_stateid *stateid); 487 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 488 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 489 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 490 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 491 extern void nfs4_schedule_state_manager(struct nfs_client *); 492 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 493 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 494 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 495 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 496 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 497 extern void nfs41_handle_server_scope(struct nfs_client *, 498 struct nfs41_server_scope **); 499 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 500 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 501 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 502 const struct nfs_lock_context *, nfs4_stateid *, 503 const struct cred **); 504 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 505 struct nfs4_state *state); 506 507 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 508 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 509 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 510 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 511 extern void nfs_release_seqid(struct nfs_seqid *seqid); 512 extern void nfs_free_seqid(struct nfs_seqid *seqid); 513 extern int nfs4_setup_sequence(struct nfs_client *client, 514 struct nfs4_sequence_args *args, 515 struct nfs4_sequence_res *res, 516 struct rpc_task *task); 517 extern int nfs4_sequence_done(struct rpc_task *task, 518 struct nfs4_sequence_res *res); 519 520 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 521 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 522 extern const nfs4_stateid zero_stateid; 523 extern const nfs4_stateid invalid_stateid; 524 525 /* nfs4super.c */ 526 struct nfs_mount_info; 527 extern struct nfs_subversion nfs_v4; 528 extern bool nfs4_disable_idmapping; 529 extern unsigned short max_session_slots; 530 extern unsigned short max_session_cb_slots; 531 extern unsigned short send_implementation_id; 532 extern bool recover_lost_locks; 533 534 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 535 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 536 537 extern int nfs4_try_get_tree(struct fs_context *); 538 extern int nfs4_get_referral_tree(struct fs_context *); 539 540 /* nfs4sysctl.c */ 541 #ifdef CONFIG_SYSCTL 542 int nfs4_register_sysctl(void); 543 void nfs4_unregister_sysctl(void); 544 #else 545 static inline int nfs4_register_sysctl(void) 546 { 547 return 0; 548 } 549 550 static inline void nfs4_unregister_sysctl(void) 551 { 552 } 553 #endif 554 555 /* nfs4xdr.c */ 556 extern const struct rpc_procinfo nfs4_procedures[]; 557 558 struct nfs4_mount_data; 559 560 /* callback_xdr.c */ 561 extern const struct svc_version nfs4_callback_version1; 562 extern const struct svc_version nfs4_callback_version4; 563 564 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 565 { 566 memcpy(dst->data, src->data, sizeof(dst->data)); 567 dst->type = src->type; 568 } 569 570 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 571 { 572 if (dst->type != src->type) 573 return false; 574 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 575 } 576 577 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 578 { 579 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 580 } 581 582 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 583 { 584 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 585 } 586 587 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 588 { 589 return nfs4_stateid_match_other(dst, src) && 590 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 591 } 592 593 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 594 { 595 u32 seqid = be32_to_cpu(s1->seqid); 596 597 if (++seqid == 0) 598 ++seqid; 599 s1->seqid = cpu_to_be32(seqid); 600 } 601 602 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 603 { 604 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 605 } 606 607 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 608 const nfs4_stateid *stateid) 609 { 610 return test_bit(NFS_OPEN_STATE, &state->flags) && 611 nfs4_stateid_match_other(&state->open_stateid, stateid); 612 } 613 614 #else 615 616 #define nfs4_close_state(a, b) do { } while (0) 617 #define nfs4_close_sync(a, b) do { } while (0) 618 #define nfs4_state_protect(a, b, c, d) do { } while (0) 619 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 620 621 #endif /* CONFIG_NFS_V4 */ 622 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 623