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_RECALL_RUNNING, 46 NFS4CLNT_RECALL_ANY_LAYOUT_READ, 47 NFS4CLNT_RECALL_ANY_LAYOUT_RW, 48 }; 49 50 #define NFS4_RENEW_TIMEOUT 0x01 51 #define NFS4_RENEW_DELEGATION_CB 0x02 52 53 struct nfs_seqid_counter; 54 struct nfs4_minor_version_ops { 55 u32 minor_version; 56 unsigned init_caps; 57 58 int (*init_client)(struct nfs_client *); 59 void (*shutdown_client)(struct nfs_client *); 60 bool (*match_stateid)(const nfs4_stateid *, 61 const nfs4_stateid *); 62 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 63 struct nfs_fsinfo *); 64 void (*free_lock_state)(struct nfs_server *, 65 struct nfs4_lock_state *); 66 int (*test_and_free_expired)(struct nfs_server *, 67 nfs4_stateid *, const struct cred *); 68 struct nfs_seqid * 69 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 70 void (*session_trunk)(struct rpc_clnt *clnt, 71 struct rpc_xprt *xprt, void *data); 72 const struct rpc_call_ops *call_sync_ops; 73 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 74 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 75 const struct nfs4_state_maintenance_ops *state_renewal_ops; 76 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 77 }; 78 79 #define NFS_SEQID_CONFIRMED 1 80 struct nfs_seqid_counter { 81 ktime_t create_time; 82 int owner_id; 83 int flags; 84 u32 counter; 85 spinlock_t lock; /* Protects the list */ 86 struct list_head list; /* Defines sequence of RPC calls */ 87 struct rpc_wait_queue wait; /* RPC call delay queue */ 88 }; 89 90 struct nfs_seqid { 91 struct nfs_seqid_counter *sequence; 92 struct list_head list; 93 struct rpc_task *task; 94 }; 95 96 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 97 { 98 if (seqid_mutating_err(-status)) 99 seqid->flags |= NFS_SEQID_CONFIRMED; 100 } 101 102 /* 103 * NFS4 state_owners and lock_owners are simply labels for ordered 104 * sequences of RPC calls. Their sole purpose is to provide once-only 105 * semantics by allowing the server to identify replayed requests. 106 */ 107 struct nfs4_state_owner { 108 struct nfs_server *so_server; 109 struct list_head so_lru; 110 unsigned long so_expires; 111 struct rb_node so_server_node; 112 113 const struct cred *so_cred; /* Associated cred */ 114 115 spinlock_t so_lock; 116 atomic_t so_count; 117 unsigned long so_flags; 118 struct list_head so_states; 119 struct nfs_seqid_counter so_seqid; 120 seqcount_t so_reclaim_seqcount; 121 struct mutex so_delegreturn_mutex; 122 }; 123 124 enum { 125 NFS_OWNER_RECLAIM_REBOOT, 126 NFS_OWNER_RECLAIM_NOGRACE 127 }; 128 129 #define NFS_LOCK_NEW 0 130 #define NFS_LOCK_RECLAIM 1 131 #define NFS_LOCK_EXPIRED 2 132 133 /* 134 * struct nfs4_state maintains the client-side state for a given 135 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 136 * 137 * OPEN: 138 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 139 * we need to know how many files are open for reading or writing on a 140 * given inode. This information too is stored here. 141 * 142 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 143 */ 144 145 struct nfs4_lock_state { 146 struct list_head ls_locks; /* Other lock stateids */ 147 struct nfs4_state * ls_state; /* Pointer to open state */ 148 #define NFS_LOCK_INITIALIZED 0 149 #define NFS_LOCK_LOST 1 150 unsigned long ls_flags; 151 struct nfs_seqid_counter ls_seqid; 152 nfs4_stateid ls_stateid; 153 refcount_t ls_count; 154 fl_owner_t ls_owner; 155 }; 156 157 /* bits for nfs4_state->flags */ 158 enum { 159 LK_STATE_IN_USE, 160 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 161 NFS_OPEN_STATE, /* OPEN stateid is set */ 162 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 163 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 164 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 165 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 166 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 167 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 168 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 169 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 170 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 171 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 172 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 173 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 174 }; 175 176 struct nfs4_state { 177 struct list_head open_states; /* List of states for the same state_owner */ 178 struct list_head inode_states; /* List of states for the same inode */ 179 struct list_head lock_states; /* List of subservient lock stateids */ 180 181 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 182 struct inode *inode; /* Pointer to the inode */ 183 184 unsigned long flags; /* Do we hold any locks? */ 185 spinlock_t state_lock; /* Protects the lock_states list */ 186 187 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 188 nfs4_stateid stateid; /* Current stateid: may be delegation */ 189 nfs4_stateid open_stateid; /* OPEN stateid */ 190 191 /* The following 3 fields are protected by owner->so_lock */ 192 unsigned int n_rdonly; /* Number of read-only references */ 193 unsigned int n_wronly; /* Number of write-only references */ 194 unsigned int n_rdwr; /* Number of read/write references */ 195 fmode_t state; /* State on the server (R,W, or RW) */ 196 refcount_t count; 197 198 wait_queue_head_t waitq; 199 struct rcu_head rcu_head; 200 }; 201 202 203 struct nfs4_exception { 204 struct nfs4_state *state; 205 struct inode *inode; 206 nfs4_stateid *stateid; 207 long timeout; 208 unsigned char delay : 1, 209 recovering : 1, 210 retry : 1; 211 bool interruptible; 212 }; 213 214 struct nfs4_state_recovery_ops { 215 int owner_flag_bit; 216 int state_flag_bit; 217 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 218 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 219 int (*establish_clid)(struct nfs_client *, const struct cred *); 220 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 221 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 222 const struct cred *); 223 }; 224 225 struct nfs4_opendata { 226 struct kref kref; 227 struct nfs_openargs o_arg; 228 struct nfs_openres o_res; 229 struct nfs_open_confirmargs c_arg; 230 struct nfs_open_confirmres c_res; 231 struct nfs4_string owner_name; 232 struct nfs4_string group_name; 233 struct nfs4_label *a_label; 234 struct nfs_fattr f_attr; 235 struct nfs4_label *f_label; 236 struct dentry *dir; 237 struct dentry *dentry; 238 struct nfs4_state_owner *owner; 239 struct nfs4_state *state; 240 struct iattr attrs; 241 struct nfs4_layoutget *lgp; 242 unsigned long timestamp; 243 bool rpc_done; 244 bool file_created; 245 bool is_recover; 246 bool cancelled; 247 int rpc_status; 248 }; 249 250 struct nfs4_add_xprt_data { 251 struct nfs_client *clp; 252 const struct cred *cred; 253 }; 254 255 struct nfs4_state_maintenance_ops { 256 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 257 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 258 int (*renew_lease)(struct nfs_client *, const struct cred *); 259 }; 260 261 struct nfs4_mig_recovery_ops { 262 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 263 struct page *, const struct cred *); 264 int (*fsid_present)(struct inode *, const struct cred *); 265 }; 266 267 extern const struct dentry_operations nfs4_dentry_operations; 268 269 /* dir.c */ 270 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 271 unsigned, umode_t); 272 273 /* fs_context.c */ 274 extern struct file_system_type nfs4_fs_type; 275 276 /* nfs4namespace.c */ 277 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 278 const struct qstr *); 279 int nfs4_submount(struct fs_context *, struct nfs_server *); 280 int nfs4_replace_transport(struct nfs_server *server, 281 const struct nfs4_fs_locations *locations); 282 283 /* nfs4proc.c */ 284 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 285 extern int nfs4_async_handle_error(struct rpc_task *task, 286 struct nfs_server *server, 287 struct nfs4_state *state, long *timeout); 288 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 289 struct rpc_message *, struct nfs4_sequence_args *, 290 struct nfs4_sequence_res *, int); 291 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 292 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 293 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 294 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 295 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 296 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 297 extern int nfs4_destroy_clientid(struct nfs_client *clp); 298 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 299 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 300 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 301 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 302 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 303 struct nfs4_fs_locations *, struct page *); 304 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 305 struct page *page, const struct cred *); 306 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 307 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 308 struct dentry *, 309 struct nfs_fh *, 310 struct nfs_fattr *); 311 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 312 extern const struct xattr_handler *nfs4_xattr_handlers[]; 313 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 314 const struct nfs_open_context *ctx, 315 const struct nfs_lock_context *l_ctx, 316 fmode_t fmode); 317 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 318 struct nfs_fattr *fattr, struct nfs4_label *label, 319 struct inode *inode); 320 extern int update_open_stateid(struct nfs4_state *state, 321 const nfs4_stateid *open_stateid, 322 const nfs4_stateid *deleg_stateid, 323 fmode_t fmode); 324 325 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 326 struct nfs_fsinfo *fsinfo); 327 #if defined(CONFIG_NFS_V4_1) 328 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 329 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 330 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 331 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 332 bool sync); 333 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 334 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 335 336 static inline bool 337 is_ds_only_client(struct nfs_client *clp) 338 { 339 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 340 EXCHGID4_FLAG_USE_PNFS_DS; 341 } 342 343 static inline bool 344 is_ds_client(struct nfs_client *clp) 345 { 346 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 347 } 348 349 static inline bool 350 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 351 struct rpc_clnt **clntp, struct rpc_message *msg) 352 { 353 rpc_authflavor_t flavor; 354 355 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 356 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 357 /* Using machine creds for cleanup operations 358 * is only relevent if the client credentials 359 * might expire. So don't bother for 360 * RPC_AUTH_UNIX. If file was only exported to 361 * sec=sys, the PUTFH would fail anyway. 362 */ 363 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 364 return false; 365 } 366 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 367 msg->rpc_cred = rpc_machine_cred(); 368 369 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 370 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 371 flavor != RPC_AUTH_GSS_KRB5P); 372 *clntp = clp->cl_rpcclient; 373 374 return true; 375 } 376 return false; 377 } 378 379 /* 380 * Function responsible for determining if an rpc_message should use the 381 * machine cred under SP4_MACH_CRED and if so switching the credential and 382 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 383 * Should be called before rpc_call_sync/rpc_call_async. 384 */ 385 static inline void 386 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 387 struct rpc_clnt **clntp, struct rpc_message *msg) 388 { 389 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 390 } 391 392 /* 393 * Special wrapper to nfs4_state_protect for write. 394 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 395 * that use machine cred use NFS_FILE_SYNC. 396 */ 397 static inline void 398 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 399 struct rpc_message *msg, struct nfs_pgio_header *hdr) 400 { 401 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 402 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 403 hdr->args.stable = NFS_FILE_SYNC; 404 } 405 #else /* CONFIG_NFS_v4_1 */ 406 static inline bool 407 is_ds_only_client(struct nfs_client *clp) 408 { 409 return false; 410 } 411 412 static inline bool 413 is_ds_client(struct nfs_client *clp) 414 { 415 return false; 416 } 417 418 static inline void 419 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 420 struct rpc_clnt **clntp, struct rpc_message *msg) 421 { 422 } 423 424 static inline void 425 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 426 struct rpc_message *msg, struct nfs_pgio_header *hdr) 427 { 428 } 429 #endif /* CONFIG_NFS_V4_1 */ 430 431 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 432 433 extern const u32 nfs4_fattr_bitmap[3]; 434 extern const u32 nfs4_statfs_bitmap[3]; 435 extern const u32 nfs4_pathconf_bitmap[3]; 436 extern const u32 nfs4_fsinfo_bitmap[3]; 437 extern const u32 nfs4_fs_locations_bitmap[3]; 438 439 void nfs40_shutdown_client(struct nfs_client *); 440 void nfs41_shutdown_client(struct nfs_client *); 441 int nfs40_init_client(struct nfs_client *); 442 int nfs41_init_client(struct nfs_client *); 443 void nfs4_free_client(struct nfs_client *); 444 445 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 446 447 /* nfs4renewd.c */ 448 extern void nfs4_schedule_state_renewal(struct nfs_client *); 449 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 450 extern void nfs4_kill_renewd(struct nfs_client *); 451 extern void nfs4_renew_state(struct work_struct *); 452 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 453 454 455 /* nfs4state.c */ 456 extern const nfs4_stateid current_stateid; 457 458 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 459 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 460 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 461 int nfs4_discover_server_trunking(struct nfs_client *clp, 462 struct nfs_client **); 463 int nfs40_discover_server_trunking(struct nfs_client *clp, 464 struct nfs_client **, const struct cred *); 465 #if defined(CONFIG_NFS_V4_1) 466 int nfs41_discover_server_trunking(struct nfs_client *clp, 467 struct nfs_client **, const struct cred *); 468 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 469 extern void nfs41_notify_server(struct nfs_client *); 470 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 471 struct nfs41_server_owner *o2); 472 #else 473 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 474 { 475 } 476 #endif /* CONFIG_NFS_V4_1 */ 477 478 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 479 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 480 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 481 extern void nfs4_free_state_owners(struct list_head *head); 482 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 483 extern void nfs4_put_open_state(struct nfs4_state *); 484 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 485 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 486 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 487 extern void nfs_inode_find_state_and_recover(struct inode *inode, 488 const nfs4_stateid *stateid); 489 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 490 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 491 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 492 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 493 extern void nfs4_schedule_state_manager(struct nfs_client *); 494 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 495 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 496 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 497 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 498 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 499 extern void nfs41_handle_server_scope(struct nfs_client *, 500 struct nfs41_server_scope **); 501 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 502 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 503 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 504 const struct nfs_lock_context *, nfs4_stateid *, 505 const struct cred **); 506 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 507 struct nfs4_state *state); 508 509 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 510 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 511 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 512 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 513 extern void nfs_release_seqid(struct nfs_seqid *seqid); 514 extern void nfs_free_seqid(struct nfs_seqid *seqid); 515 extern int nfs4_setup_sequence(struct nfs_client *client, 516 struct nfs4_sequence_args *args, 517 struct nfs4_sequence_res *res, 518 struct rpc_task *task); 519 extern int nfs4_sequence_done(struct rpc_task *task, 520 struct nfs4_sequence_res *res); 521 522 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 523 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 524 extern const nfs4_stateid zero_stateid; 525 extern const nfs4_stateid invalid_stateid; 526 527 /* nfs4super.c */ 528 struct nfs_mount_info; 529 extern struct nfs_subversion nfs_v4; 530 extern bool nfs4_disable_idmapping; 531 extern unsigned short max_session_slots; 532 extern unsigned short max_session_cb_slots; 533 extern unsigned short send_implementation_id; 534 extern bool recover_lost_locks; 535 536 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 537 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 538 539 extern int nfs4_try_get_tree(struct fs_context *); 540 extern int nfs4_get_referral_tree(struct fs_context *); 541 542 /* nfs4sysctl.c */ 543 #ifdef CONFIG_SYSCTL 544 int nfs4_register_sysctl(void); 545 void nfs4_unregister_sysctl(void); 546 #else 547 static inline int nfs4_register_sysctl(void) 548 { 549 return 0; 550 } 551 552 static inline void nfs4_unregister_sysctl(void) 553 { 554 } 555 #endif 556 557 /* nfs4xdr.c */ 558 extern const struct rpc_procinfo nfs4_procedures[]; 559 560 struct nfs4_mount_data; 561 562 /* callback_xdr.c */ 563 extern const struct svc_version nfs4_callback_version1; 564 extern const struct svc_version nfs4_callback_version4; 565 566 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 567 { 568 memcpy(dst->data, src->data, sizeof(dst->data)); 569 dst->type = src->type; 570 } 571 572 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 573 { 574 if (dst->type != src->type) 575 return false; 576 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 577 } 578 579 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 580 { 581 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 582 } 583 584 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 585 { 586 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 587 } 588 589 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 590 { 591 return nfs4_stateid_match_other(dst, src) && 592 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 593 } 594 595 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 596 { 597 u32 seqid = be32_to_cpu(s1->seqid); 598 599 if (++seqid == 0) 600 ++seqid; 601 s1->seqid = cpu_to_be32(seqid); 602 } 603 604 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 605 { 606 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 607 } 608 609 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 610 const nfs4_stateid *stateid) 611 { 612 return test_bit(NFS_OPEN_STATE, &state->flags) && 613 nfs4_stateid_match_other(&state->open_stateid, stateid); 614 } 615 616 #else 617 618 #define nfs4_close_state(a, b) do { } while (0) 619 #define nfs4_close_sync(a, b) do { } while (0) 620 #define nfs4_state_protect(a, b, c, d) do { } while (0) 621 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 622 623 #endif /* CONFIG_NFS_V4 */ 624 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 625