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 *, 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 77 struct 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 87 struct nfs_seqid { 88 struct nfs_seqid_counter *sequence; 89 struct list_head list; 90 struct rpc_task *task; 91 }; 92 93 static 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 */ 104 struct 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 }; 120 121 enum { 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 */ 141 142 struct 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 */ 155 enum { 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 #ifdef CONFIG_NFS_V4_2 169 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 170 #endif /* CONFIG_NFS_V4_2 */ 171 }; 172 173 struct nfs4_state { 174 struct list_head open_states; /* List of states for the same state_owner */ 175 struct list_head inode_states; /* List of states for the same inode */ 176 struct list_head lock_states; /* List of subservient lock stateids */ 177 178 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 179 struct inode *inode; /* Pointer to the inode */ 180 181 unsigned long flags; /* Do we hold any locks? */ 182 spinlock_t state_lock; /* Protects the lock_states list */ 183 184 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 185 nfs4_stateid stateid; /* Current stateid: may be delegation */ 186 nfs4_stateid open_stateid; /* OPEN stateid */ 187 188 /* The following 3 fields are protected by owner->so_lock */ 189 unsigned int n_rdonly; /* Number of read-only references */ 190 unsigned int n_wronly; /* Number of write-only references */ 191 unsigned int n_rdwr; /* Number of read/write references */ 192 fmode_t state; /* State on the server (R,W, or RW) */ 193 refcount_t count; 194 195 wait_queue_head_t waitq; 196 struct rcu_head rcu_head; 197 }; 198 199 200 struct nfs4_exception { 201 struct nfs4_state *state; 202 struct inode *inode; 203 nfs4_stateid *stateid; 204 long timeout; 205 unsigned char delay : 1, 206 recovering : 1, 207 retry : 1; 208 }; 209 210 struct nfs4_state_recovery_ops { 211 int owner_flag_bit; 212 int state_flag_bit; 213 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 214 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 215 int (*establish_clid)(struct nfs_client *, struct rpc_cred *); 216 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *); 217 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 218 struct rpc_cred *); 219 }; 220 221 struct nfs4_opendata { 222 struct kref kref; 223 struct nfs_openargs o_arg; 224 struct nfs_openres o_res; 225 struct nfs_open_confirmargs c_arg; 226 struct nfs_open_confirmres c_res; 227 struct nfs4_string owner_name; 228 struct nfs4_string group_name; 229 struct nfs4_label *a_label; 230 struct nfs_fattr f_attr; 231 struct nfs4_label *f_label; 232 struct dentry *dir; 233 struct dentry *dentry; 234 struct nfs4_state_owner *owner; 235 struct nfs4_state *state; 236 struct iattr attrs; 237 struct nfs4_layoutget *lgp; 238 unsigned long timestamp; 239 bool rpc_done; 240 bool file_created; 241 bool is_recover; 242 bool cancelled; 243 int rpc_status; 244 }; 245 246 struct nfs4_add_xprt_data { 247 struct nfs_client *clp; 248 struct rpc_cred *cred; 249 }; 250 251 struct nfs4_state_maintenance_ops { 252 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned); 253 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *); 254 int (*renew_lease)(struct nfs_client *, struct rpc_cred *); 255 }; 256 257 struct nfs4_mig_recovery_ops { 258 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 259 struct page *, struct rpc_cred *); 260 int (*fsid_present)(struct inode *, struct rpc_cred *); 261 }; 262 263 extern const struct dentry_operations nfs4_dentry_operations; 264 265 /* dir.c */ 266 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 267 unsigned, umode_t); 268 269 /* super.c */ 270 extern struct file_system_type nfs4_fs_type; 271 272 /* nfs4namespace.c */ 273 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 274 const struct qstr *); 275 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *, 276 struct nfs_fh *, struct nfs_fattr *); 277 int nfs4_replace_transport(struct nfs_server *server, 278 const struct nfs4_fs_locations *locations); 279 280 /* nfs4proc.c */ 281 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 282 extern int nfs4_async_handle_error(struct rpc_task *task, 283 struct nfs_server *server, 284 struct nfs4_state *state, long *timeout); 285 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 286 struct rpc_message *, struct nfs4_sequence_args *, 287 struct nfs4_sequence_res *, int); 288 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 289 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *); 290 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *); 291 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 292 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred); 293 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred); 294 extern int nfs4_destroy_clientid(struct nfs_client *clp); 295 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *); 296 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *); 297 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 298 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 299 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 300 struct nfs4_fs_locations *, struct page *); 301 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 302 struct page *page, struct rpc_cred *); 303 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *); 304 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *, 305 struct nfs_fh *, struct nfs_fattr *); 306 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 307 extern const struct xattr_handler *nfs4_xattr_handlers[]; 308 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 309 const struct nfs_open_context *ctx, 310 const struct nfs_lock_context *l_ctx, 311 fmode_t fmode); 312 313 #if defined(CONFIG_NFS_V4_1) 314 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 315 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *); 316 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *); 317 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 318 struct nfs_fsinfo *fsinfo); 319 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 320 bool sync); 321 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 322 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 323 324 static inline bool 325 is_ds_only_client(struct nfs_client *clp) 326 { 327 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 328 EXCHGID4_FLAG_USE_PNFS_DS; 329 } 330 331 static inline bool 332 is_ds_client(struct nfs_client *clp) 333 { 334 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 335 } 336 337 static inline bool 338 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 339 struct rpc_clnt **clntp, struct rpc_message *msg) 340 { 341 struct rpc_cred *newcred = NULL; 342 rpc_authflavor_t flavor; 343 344 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 345 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 346 /* Using machine creds for cleanup operations 347 * is only relevent if the client credentials 348 * might expire. So don't bother for 349 * RPC_AUTH_UNIX. If file was only exported to 350 * sec=sys, the PUTFH would fail anyway. 351 */ 352 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 353 return false; 354 } 355 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 356 spin_lock(&clp->cl_lock); 357 if (clp->cl_machine_cred != NULL) 358 /* don't call get_rpccred on the machine cred - 359 * a reference will be held for life of clp */ 360 newcred = clp->cl_machine_cred; 361 spin_unlock(&clp->cl_lock); 362 msg->rpc_cred = newcred; 363 364 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 365 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 366 flavor != RPC_AUTH_GSS_KRB5P); 367 *clntp = clp->cl_rpcclient; 368 369 return true; 370 } 371 return false; 372 } 373 374 /* 375 * Function responsible for determining if an rpc_message should use the 376 * machine cred under SP4_MACH_CRED and if so switching the credential and 377 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 378 * Should be called before rpc_call_sync/rpc_call_async. 379 */ 380 static inline void 381 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 382 struct rpc_clnt **clntp, struct rpc_message *msg) 383 { 384 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 385 } 386 387 /* 388 * Special wrapper to nfs4_state_protect for write. 389 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 390 * that use machine cred use NFS_FILE_SYNC. 391 */ 392 static inline void 393 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 394 struct rpc_message *msg, struct nfs_pgio_header *hdr) 395 { 396 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 397 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 398 hdr->args.stable = NFS_FILE_SYNC; 399 } 400 #else /* CONFIG_NFS_v4_1 */ 401 static inline bool 402 is_ds_only_client(struct nfs_client *clp) 403 { 404 return false; 405 } 406 407 static inline bool 408 is_ds_client(struct nfs_client *clp) 409 { 410 return false; 411 } 412 413 static inline void 414 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 415 struct rpc_clnt **clntp, struct rpc_message *msg) 416 { 417 } 418 419 static inline void 420 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 421 struct rpc_message *msg, struct nfs_pgio_header *hdr) 422 { 423 } 424 #endif /* CONFIG_NFS_V4_1 */ 425 426 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 427 428 extern const u32 nfs4_fattr_bitmap[3]; 429 extern const u32 nfs4_statfs_bitmap[3]; 430 extern const u32 nfs4_pathconf_bitmap[3]; 431 extern const u32 nfs4_fsinfo_bitmap[3]; 432 extern const u32 nfs4_fs_locations_bitmap[3]; 433 434 void nfs40_shutdown_client(struct nfs_client *); 435 void nfs41_shutdown_client(struct nfs_client *); 436 int nfs40_init_client(struct nfs_client *); 437 int nfs41_init_client(struct nfs_client *); 438 void nfs4_free_client(struct nfs_client *); 439 440 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 441 442 /* nfs4renewd.c */ 443 extern void nfs4_schedule_state_renewal(struct nfs_client *); 444 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 445 extern void nfs4_kill_renewd(struct nfs_client *); 446 extern void nfs4_renew_state(struct work_struct *); 447 extern void nfs4_set_lease_period(struct nfs_client *clp, 448 unsigned long lease, 449 unsigned long lastrenewed); 450 451 452 /* nfs4state.c */ 453 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp); 454 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp); 455 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp); 456 int nfs4_discover_server_trunking(struct nfs_client *clp, 457 struct nfs_client **); 458 int nfs40_discover_server_trunking(struct nfs_client *clp, 459 struct nfs_client **, struct rpc_cred *); 460 #if defined(CONFIG_NFS_V4_1) 461 int nfs41_discover_server_trunking(struct nfs_client *clp, 462 struct nfs_client **, struct rpc_cred *); 463 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 464 extern void nfs41_notify_server(struct nfs_client *); 465 #else 466 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 467 { 468 } 469 #endif /* CONFIG_NFS_V4_1 */ 470 471 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t); 472 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 473 extern void nfs4_purge_state_owners(struct nfs_server *); 474 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 475 extern void nfs4_put_open_state(struct nfs4_state *); 476 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 477 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 478 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 479 extern void nfs_inode_find_state_and_recover(struct inode *inode, 480 const nfs4_stateid *stateid); 481 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 482 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 483 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 484 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 485 extern void nfs4_schedule_state_manager(struct nfs_client *); 486 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 487 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 488 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 489 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 490 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 491 extern void nfs41_handle_server_scope(struct nfs_client *, 492 struct nfs41_server_scope **); 493 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 494 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 495 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 496 const struct nfs_lock_context *, nfs4_stateid *, 497 struct rpc_cred **); 498 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst, 499 struct nfs4_state *state); 500 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 501 struct nfs4_state *state); 502 503 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 504 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 505 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 506 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 507 extern void nfs_release_seqid(struct nfs_seqid *seqid); 508 extern void nfs_free_seqid(struct nfs_seqid *seqid); 509 extern int nfs4_setup_sequence(struct nfs_client *client, 510 struct nfs4_sequence_args *args, 511 struct nfs4_sequence_res *res, 512 struct rpc_task *task); 513 extern int nfs4_sequence_done(struct rpc_task *task, 514 struct nfs4_sequence_res *res); 515 516 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 517 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 518 extern const nfs4_stateid zero_stateid; 519 extern const nfs4_stateid invalid_stateid; 520 521 /* nfs4super.c */ 522 struct nfs_mount_info; 523 extern struct nfs_subversion nfs_v4; 524 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *); 525 extern bool nfs4_disable_idmapping; 526 extern unsigned short max_session_slots; 527 extern unsigned short max_session_cb_slots; 528 extern unsigned short send_implementation_id; 529 extern bool recover_lost_locks; 530 531 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 532 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 533 534 /* nfs4sysctl.c */ 535 #ifdef CONFIG_SYSCTL 536 int nfs4_register_sysctl(void); 537 void nfs4_unregister_sysctl(void); 538 #else 539 static inline int nfs4_register_sysctl(void) 540 { 541 return 0; 542 } 543 544 static inline void nfs4_unregister_sysctl(void) 545 { 546 } 547 #endif 548 549 /* nfs4xdr.c */ 550 extern const struct rpc_procinfo nfs4_procedures[]; 551 552 struct nfs4_mount_data; 553 554 /* callback_xdr.c */ 555 extern const struct svc_version nfs4_callback_version1; 556 extern const struct svc_version nfs4_callback_version4; 557 558 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 559 { 560 memcpy(dst->data, src->data, sizeof(dst->data)); 561 dst->type = src->type; 562 } 563 564 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 565 { 566 if (dst->type != src->type) 567 return false; 568 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 569 } 570 571 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 572 { 573 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 574 } 575 576 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 577 { 578 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 579 } 580 581 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 582 { 583 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 584 } 585 586 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 587 const nfs4_stateid *stateid) 588 { 589 return test_bit(NFS_OPEN_STATE, &state->flags) && 590 nfs4_stateid_match_other(&state->open_stateid, stateid); 591 } 592 593 #else 594 595 #define nfs4_close_state(a, b) do { } while (0) 596 #define nfs4_close_sync(a, b) do { } while (0) 597 #define nfs4_state_protect(a, b, c, d) do { } while (0) 598 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 599 600 #endif /* CONFIG_NFS_V4 */ 601 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 602