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 #ifdef CONFIG_NFS_V4_2 167 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 168 #endif /* CONFIG_NFS_V4_2 */ 169 }; 170 171 struct nfs4_state { 172 struct list_head open_states; /* List of states for the same state_owner */ 173 struct list_head inode_states; /* List of states for the same inode */ 174 struct list_head lock_states; /* List of subservient lock stateids */ 175 176 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 177 struct inode *inode; /* Pointer to the inode */ 178 179 unsigned long flags; /* Do we hold any locks? */ 180 spinlock_t state_lock; /* Protects the lock_states list */ 181 182 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 183 nfs4_stateid stateid; /* Current stateid: may be delegation */ 184 nfs4_stateid open_stateid; /* OPEN stateid */ 185 186 /* The following 3 fields are protected by owner->so_lock */ 187 unsigned int n_rdonly; /* Number of read-only references */ 188 unsigned int n_wronly; /* Number of write-only references */ 189 unsigned int n_rdwr; /* Number of read/write references */ 190 fmode_t state; /* State on the server (R,W, or RW) */ 191 refcount_t count; 192 193 wait_queue_head_t waitq; 194 struct rcu_head rcu_head; 195 }; 196 197 198 struct nfs4_exception { 199 struct nfs4_state *state; 200 struct inode *inode; 201 nfs4_stateid *stateid; 202 long timeout; 203 unsigned char delay : 1, 204 recovering : 1, 205 retry : 1; 206 }; 207 208 struct nfs4_state_recovery_ops { 209 int owner_flag_bit; 210 int state_flag_bit; 211 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 212 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 213 int (*establish_clid)(struct nfs_client *, struct rpc_cred *); 214 int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *); 215 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 216 struct rpc_cred *); 217 }; 218 219 struct nfs4_opendata { 220 struct kref kref; 221 struct nfs_openargs o_arg; 222 struct nfs_openres o_res; 223 struct nfs_open_confirmargs c_arg; 224 struct nfs_open_confirmres c_res; 225 struct nfs4_string owner_name; 226 struct nfs4_string group_name; 227 struct nfs4_label *a_label; 228 struct nfs_fattr f_attr; 229 struct nfs4_label *f_label; 230 struct dentry *dir; 231 struct dentry *dentry; 232 struct nfs4_state_owner *owner; 233 struct nfs4_state *state; 234 struct iattr attrs; 235 struct nfs4_layoutget *lgp; 236 unsigned long timestamp; 237 bool rpc_done; 238 bool file_created; 239 bool is_recover; 240 bool cancelled; 241 int rpc_status; 242 }; 243 244 struct nfs4_add_xprt_data { 245 struct nfs_client *clp; 246 struct rpc_cred *cred; 247 }; 248 249 struct nfs4_state_maintenance_ops { 250 int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned); 251 struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *); 252 int (*renew_lease)(struct nfs_client *, struct rpc_cred *); 253 }; 254 255 struct nfs4_mig_recovery_ops { 256 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 257 struct page *, struct rpc_cred *); 258 int (*fsid_present)(struct inode *, struct rpc_cred *); 259 }; 260 261 extern const struct dentry_operations nfs4_dentry_operations; 262 263 /* dir.c */ 264 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 265 unsigned, umode_t); 266 267 /* super.c */ 268 extern struct file_system_type nfs4_fs_type; 269 270 /* nfs4namespace.c */ 271 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 272 const struct qstr *); 273 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *, 274 struct nfs_fh *, struct nfs_fattr *); 275 int nfs4_replace_transport(struct nfs_server *server, 276 const struct nfs4_fs_locations *locations); 277 278 /* nfs4proc.c */ 279 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 280 extern int nfs4_async_handle_error(struct rpc_task *task, 281 struct nfs_server *server, 282 struct nfs4_state *state, long *timeout); 283 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 284 struct rpc_message *, struct nfs4_sequence_args *, 285 struct nfs4_sequence_res *, int); 286 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 287 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *); 288 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *); 289 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 290 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred); 291 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred); 292 extern int nfs4_destroy_clientid(struct nfs_client *clp); 293 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *); 294 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *); 295 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 296 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 297 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 298 struct nfs4_fs_locations *, struct page *); 299 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 300 struct page *page, struct rpc_cred *); 301 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *); 302 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *, 303 struct nfs_fh *, struct nfs_fattr *); 304 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 305 extern const struct xattr_handler *nfs4_xattr_handlers[]; 306 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 307 const struct nfs_open_context *ctx, 308 const struct nfs_lock_context *l_ctx, 309 fmode_t fmode); 310 311 #if defined(CONFIG_NFS_V4_1) 312 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 313 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *); 314 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *); 315 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 316 struct nfs_fsinfo *fsinfo); 317 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 318 bool sync); 319 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 320 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 321 322 static inline bool 323 is_ds_only_client(struct nfs_client *clp) 324 { 325 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 326 EXCHGID4_FLAG_USE_PNFS_DS; 327 } 328 329 static inline bool 330 is_ds_client(struct nfs_client *clp) 331 { 332 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 333 } 334 335 static inline bool 336 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 337 struct rpc_clnt **clntp, struct rpc_message *msg) 338 { 339 struct rpc_cred *newcred = NULL; 340 rpc_authflavor_t flavor; 341 342 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 343 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 344 /* Using machine creds for cleanup operations 345 * is only relevent if the client credentials 346 * might expire. So don't bother for 347 * RPC_AUTH_UNIX. If file was only exported to 348 * sec=sys, the PUTFH would fail anyway. 349 */ 350 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 351 return false; 352 } 353 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 354 spin_lock(&clp->cl_lock); 355 if (clp->cl_machine_cred != NULL) 356 /* don't call get_rpccred on the machine cred - 357 * a reference will be held for life of clp */ 358 newcred = clp->cl_machine_cred; 359 spin_unlock(&clp->cl_lock); 360 msg->rpc_cred = newcred; 361 362 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 363 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 364 flavor != RPC_AUTH_GSS_KRB5P); 365 *clntp = clp->cl_rpcclient; 366 367 return true; 368 } 369 return false; 370 } 371 372 /* 373 * Function responsible for determining if an rpc_message should use the 374 * machine cred under SP4_MACH_CRED and if so switching the credential and 375 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 376 * Should be called before rpc_call_sync/rpc_call_async. 377 */ 378 static inline void 379 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 380 struct rpc_clnt **clntp, struct rpc_message *msg) 381 { 382 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 383 } 384 385 /* 386 * Special wrapper to nfs4_state_protect for write. 387 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 388 * that use machine cred use NFS_FILE_SYNC. 389 */ 390 static inline void 391 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 392 struct rpc_message *msg, struct nfs_pgio_header *hdr) 393 { 394 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 395 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 396 hdr->args.stable = NFS_FILE_SYNC; 397 } 398 #else /* CONFIG_NFS_v4_1 */ 399 static inline bool 400 is_ds_only_client(struct nfs_client *clp) 401 { 402 return false; 403 } 404 405 static inline bool 406 is_ds_client(struct nfs_client *clp) 407 { 408 return false; 409 } 410 411 static inline void 412 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 413 struct rpc_clnt **clntp, struct rpc_message *msg) 414 { 415 } 416 417 static inline void 418 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 419 struct rpc_message *msg, struct nfs_pgio_header *hdr) 420 { 421 } 422 #endif /* CONFIG_NFS_V4_1 */ 423 424 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 425 426 extern const u32 nfs4_fattr_bitmap[3]; 427 extern const u32 nfs4_statfs_bitmap[3]; 428 extern const u32 nfs4_pathconf_bitmap[3]; 429 extern const u32 nfs4_fsinfo_bitmap[3]; 430 extern const u32 nfs4_fs_locations_bitmap[3]; 431 432 void nfs40_shutdown_client(struct nfs_client *); 433 void nfs41_shutdown_client(struct nfs_client *); 434 int nfs40_init_client(struct nfs_client *); 435 int nfs41_init_client(struct nfs_client *); 436 void nfs4_free_client(struct nfs_client *); 437 438 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 439 440 /* nfs4renewd.c */ 441 extern void nfs4_schedule_state_renewal(struct nfs_client *); 442 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 443 extern void nfs4_kill_renewd(struct nfs_client *); 444 extern void nfs4_renew_state(struct work_struct *); 445 extern void nfs4_set_lease_period(struct nfs_client *clp, 446 unsigned long lease, 447 unsigned long lastrenewed); 448 449 450 /* nfs4state.c */ 451 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp); 452 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp); 453 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp); 454 int nfs4_discover_server_trunking(struct nfs_client *clp, 455 struct nfs_client **); 456 int nfs40_discover_server_trunking(struct nfs_client *clp, 457 struct nfs_client **, struct rpc_cred *); 458 #if defined(CONFIG_NFS_V4_1) 459 int nfs41_discover_server_trunking(struct nfs_client *clp, 460 struct nfs_client **, struct rpc_cred *); 461 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 462 extern void nfs41_notify_server(struct nfs_client *); 463 #else 464 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 465 { 466 } 467 #endif /* CONFIG_NFS_V4_1 */ 468 469 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t); 470 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 471 extern void nfs4_purge_state_owners(struct nfs_server *); 472 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 473 extern void nfs4_put_open_state(struct nfs4_state *); 474 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 475 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 476 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 477 extern void nfs_inode_find_state_and_recover(struct inode *inode, 478 const nfs4_stateid *stateid); 479 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 480 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 481 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 482 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 483 extern void nfs4_schedule_state_manager(struct nfs_client *); 484 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 485 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 486 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 487 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 488 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 489 extern void nfs41_handle_server_scope(struct nfs_client *, 490 struct nfs41_server_scope **); 491 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 492 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 493 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 494 const struct nfs_lock_context *, nfs4_stateid *, 495 struct rpc_cred **); 496 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst, 497 struct nfs4_state *state); 498 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 499 struct nfs4_state *state); 500 501 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 502 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 503 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 504 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 505 extern void nfs_release_seqid(struct nfs_seqid *seqid); 506 extern void nfs_free_seqid(struct nfs_seqid *seqid); 507 extern int nfs4_setup_sequence(struct nfs_client *client, 508 struct nfs4_sequence_args *args, 509 struct nfs4_sequence_res *res, 510 struct rpc_task *task); 511 extern int nfs4_sequence_done(struct rpc_task *task, 512 struct nfs4_sequence_res *res); 513 514 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 515 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 516 extern const nfs4_stateid zero_stateid; 517 extern const nfs4_stateid invalid_stateid; 518 519 /* nfs4super.c */ 520 struct nfs_mount_info; 521 extern struct nfs_subversion nfs_v4; 522 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *); 523 extern bool nfs4_disable_idmapping; 524 extern unsigned short max_session_slots; 525 extern unsigned short max_session_cb_slots; 526 extern unsigned short send_implementation_id; 527 extern bool recover_lost_locks; 528 529 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 530 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 531 532 /* nfs4sysctl.c */ 533 #ifdef CONFIG_SYSCTL 534 int nfs4_register_sysctl(void); 535 void nfs4_unregister_sysctl(void); 536 #else 537 static inline int nfs4_register_sysctl(void) 538 { 539 return 0; 540 } 541 542 static inline void nfs4_unregister_sysctl(void) 543 { 544 } 545 #endif 546 547 /* nfs4xdr.c */ 548 extern const struct rpc_procinfo nfs4_procedures[]; 549 550 struct nfs4_mount_data; 551 552 /* callback_xdr.c */ 553 extern const struct svc_version nfs4_callback_version1; 554 extern const struct svc_version nfs4_callback_version4; 555 556 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 557 { 558 memcpy(dst->data, src->data, sizeof(dst->data)); 559 dst->type = src->type; 560 } 561 562 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 563 { 564 if (dst->type != src->type) 565 return false; 566 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 567 } 568 569 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 570 { 571 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 572 } 573 574 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 575 { 576 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 577 } 578 579 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 580 { 581 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 582 } 583 584 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 585 const nfs4_stateid *stateid) 586 { 587 return test_bit(NFS_OPEN_STATE, &state->flags) && 588 nfs4_stateid_match_other(&state->open_stateid, stateid); 589 } 590 591 #else 592 593 #define nfs4_close_state(a, b) do { } while (0) 594 #define nfs4_close_sync(a, b) do { } while (0) 595 #define nfs4_state_protect(a, b, c, d) do { } while (0) 596 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 597 598 #endif /* CONFIG_NFS_V4 */ 599 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 600