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 NFS4CLNT_DELEGRETURN_DELAYED, 49 }; 50 51 #define NFS4_RENEW_TIMEOUT 0x01 52 #define NFS4_RENEW_DELEGATION_CB 0x02 53 54 struct nfs_seqid_counter; 55 struct nfs4_minor_version_ops { 56 u32 minor_version; 57 unsigned init_caps; 58 59 int (*init_client)(struct nfs_client *); 60 void (*shutdown_client)(struct nfs_client *); 61 bool (*match_stateid)(const nfs4_stateid *, 62 const nfs4_stateid *); 63 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 64 struct nfs_fsinfo *); 65 void (*free_lock_state)(struct nfs_server *, 66 struct nfs4_lock_state *); 67 int (*test_and_free_expired)(struct nfs_server *, 68 nfs4_stateid *, const struct cred *); 69 struct nfs_seqid * 70 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 71 void (*session_trunk)(struct rpc_clnt *clnt, 72 struct rpc_xprt *xprt, void *data); 73 const struct rpc_call_ops *call_sync_ops; 74 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 75 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 76 const struct nfs4_state_maintenance_ops *state_renewal_ops; 77 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 78 }; 79 80 #define NFS_SEQID_CONFIRMED 1 81 struct nfs_seqid_counter { 82 ktime_t create_time; 83 int owner_id; 84 int flags; 85 u32 counter; 86 spinlock_t lock; /* Protects the list */ 87 struct list_head list; /* Defines sequence of RPC calls */ 88 struct rpc_wait_queue wait; /* RPC call delay queue */ 89 }; 90 91 struct nfs_seqid { 92 struct nfs_seqid_counter *sequence; 93 struct list_head list; 94 struct rpc_task *task; 95 }; 96 97 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 98 { 99 if (seqid_mutating_err(-status)) 100 seqid->flags |= NFS_SEQID_CONFIRMED; 101 } 102 103 /* 104 * NFS4 state_owners and lock_owners are simply labels for ordered 105 * sequences of RPC calls. Their sole purpose is to provide once-only 106 * semantics by allowing the server to identify replayed requests. 107 */ 108 struct nfs4_state_owner { 109 struct nfs_server *so_server; 110 struct list_head so_lru; 111 unsigned long so_expires; 112 struct rb_node so_server_node; 113 114 const struct cred *so_cred; /* Associated cred */ 115 116 spinlock_t so_lock; 117 atomic_t so_count; 118 unsigned long so_flags; 119 struct list_head so_states; 120 struct nfs_seqid_counter so_seqid; 121 seqcount_spinlock_t so_reclaim_seqcount; 122 struct mutex so_delegreturn_mutex; 123 }; 124 125 enum { 126 NFS_OWNER_RECLAIM_REBOOT, 127 NFS_OWNER_RECLAIM_NOGRACE 128 }; 129 130 #define NFS_LOCK_NEW 0 131 #define NFS_LOCK_RECLAIM 1 132 #define NFS_LOCK_EXPIRED 2 133 134 /* 135 * struct nfs4_state maintains the client-side state for a given 136 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 137 * 138 * OPEN: 139 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 140 * we need to know how many files are open for reading or writing on a 141 * given inode. This information too is stored here. 142 * 143 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 144 */ 145 146 struct nfs4_lock_state { 147 struct list_head ls_locks; /* Other lock stateids */ 148 struct nfs4_state * ls_state; /* Pointer to open state */ 149 #define NFS_LOCK_INITIALIZED 0 150 #define NFS_LOCK_LOST 1 151 unsigned long ls_flags; 152 struct nfs_seqid_counter ls_seqid; 153 nfs4_stateid ls_stateid; 154 refcount_t ls_count; 155 fl_owner_t ls_owner; 156 }; 157 158 /* bits for nfs4_state->flags */ 159 enum { 160 LK_STATE_IN_USE, 161 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 162 NFS_OPEN_STATE, /* OPEN stateid is set */ 163 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 164 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 165 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 166 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 167 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 168 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 169 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 170 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 171 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 172 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 173 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 174 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 175 }; 176 177 struct nfs4_state { 178 struct list_head open_states; /* List of states for the same state_owner */ 179 struct list_head inode_states; /* List of states for the same inode */ 180 struct list_head lock_states; /* List of subservient lock stateids */ 181 182 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 183 struct inode *inode; /* Pointer to the inode */ 184 185 unsigned long flags; /* Do we hold any locks? */ 186 spinlock_t state_lock; /* Protects the lock_states list */ 187 188 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 189 nfs4_stateid stateid; /* Current stateid: may be delegation */ 190 nfs4_stateid open_stateid; /* OPEN stateid */ 191 192 /* The following 3 fields are protected by owner->so_lock */ 193 unsigned int n_rdonly; /* Number of read-only references */ 194 unsigned int n_wronly; /* Number of write-only references */ 195 unsigned int n_rdwr; /* Number of read/write references */ 196 fmode_t state; /* State on the server (R,W, or RW) */ 197 refcount_t count; 198 199 wait_queue_head_t waitq; 200 struct rcu_head rcu_head; 201 }; 202 203 204 struct nfs4_exception { 205 struct nfs4_state *state; 206 struct inode *inode; 207 nfs4_stateid *stateid; 208 long timeout; 209 unsigned char task_is_privileged : 1; 210 unsigned char delay : 1, 211 recovering : 1, 212 retry : 1; 213 bool interruptible; 214 }; 215 216 struct nfs4_state_recovery_ops { 217 int owner_flag_bit; 218 int state_flag_bit; 219 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 220 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 221 int (*establish_clid)(struct nfs_client *, const struct cred *); 222 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 223 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 224 const struct cred *); 225 }; 226 227 struct nfs4_opendata { 228 struct kref kref; 229 struct nfs_openargs o_arg; 230 struct nfs_openres o_res; 231 struct nfs_open_confirmargs c_arg; 232 struct nfs_open_confirmres c_res; 233 struct nfs4_string owner_name; 234 struct nfs4_string group_name; 235 struct nfs4_label *a_label; 236 struct nfs_fattr f_attr; 237 struct dentry *dir; 238 struct dentry *dentry; 239 struct nfs4_state_owner *owner; 240 struct nfs4_state *state; 241 struct iattr attrs; 242 struct nfs4_layoutget *lgp; 243 unsigned long timestamp; 244 bool rpc_done; 245 bool file_created; 246 bool is_recover; 247 bool cancelled; 248 int rpc_status; 249 }; 250 251 struct nfs4_add_xprt_data { 252 struct nfs_client *clp; 253 const struct cred *cred; 254 }; 255 256 struct nfs4_state_maintenance_ops { 257 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 258 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 259 int (*renew_lease)(struct nfs_client *, const struct cred *); 260 }; 261 262 struct nfs4_mig_recovery_ops { 263 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 264 struct page *, const struct cred *); 265 int (*fsid_present)(struct inode *, const struct cred *); 266 }; 267 268 extern const struct dentry_operations nfs4_dentry_operations; 269 270 /* dir.c */ 271 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 272 unsigned, umode_t); 273 274 /* fs_context.c */ 275 extern struct file_system_type nfs4_fs_type; 276 277 /* nfs4namespace.c */ 278 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 279 const struct qstr *); 280 int nfs4_submount(struct fs_context *, struct nfs_server *); 281 int nfs4_replace_transport(struct nfs_server *server, 282 const struct nfs4_fs_locations *locations); 283 284 /* nfs4proc.c */ 285 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 286 extern int nfs4_async_handle_error(struct rpc_task *task, 287 struct nfs_server *server, 288 struct nfs4_state *state, long *timeout); 289 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 290 struct rpc_message *, struct nfs4_sequence_args *, 291 struct nfs4_sequence_res *, int); 292 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 293 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 294 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 295 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 296 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 297 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 298 extern int nfs4_destroy_clientid(struct nfs_client *clp); 299 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 300 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 301 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 302 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 303 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 304 struct nfs4_fs_locations *, struct page *); 305 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 306 struct page *page, const struct cred *); 307 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 308 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 309 struct dentry *, 310 struct nfs_fh *, 311 struct nfs_fattr *); 312 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 313 extern const struct xattr_handler *nfs4_xattr_handlers[]; 314 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 315 const struct nfs_open_context *ctx, 316 const struct nfs_lock_context *l_ctx, 317 fmode_t fmode); 318 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 319 struct nfs_fattr *fattr, 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 extern int nfs4_proc_setlease(struct file *file, long arg, 325 struct file_lock **lease, void **priv); 326 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 327 struct nfs_fsinfo *fsinfo); 328 extern void nfs4_update_changeattr(struct inode *dir, 329 struct nfs4_change_info *cinfo, 330 unsigned long timestamp, 331 unsigned long cache_validity); 332 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 333 struct page **pages); 334 335 #if defined(CONFIG_NFS_V4_1) 336 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 337 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 338 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 339 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 340 bool sync); 341 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 342 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 343 344 static inline bool 345 is_ds_only_client(struct nfs_client *clp) 346 { 347 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 348 EXCHGID4_FLAG_USE_PNFS_DS; 349 } 350 351 static inline bool 352 is_ds_client(struct nfs_client *clp) 353 { 354 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 355 } 356 357 static inline bool 358 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 359 struct rpc_clnt **clntp, struct rpc_message *msg) 360 { 361 rpc_authflavor_t flavor; 362 363 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 364 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 365 /* Using machine creds for cleanup operations 366 * is only relevent if the client credentials 367 * might expire. So don't bother for 368 * RPC_AUTH_UNIX. If file was only exported to 369 * sec=sys, the PUTFH would fail anyway. 370 */ 371 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 372 return false; 373 } 374 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 375 msg->rpc_cred = rpc_machine_cred(); 376 377 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 378 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 379 flavor != RPC_AUTH_GSS_KRB5P); 380 *clntp = clp->cl_rpcclient; 381 382 return true; 383 } 384 return false; 385 } 386 387 /* 388 * Function responsible for determining if an rpc_message should use the 389 * machine cred under SP4_MACH_CRED and if so switching the credential and 390 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 391 * Should be called before rpc_call_sync/rpc_call_async. 392 */ 393 static inline void 394 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 395 struct rpc_clnt **clntp, struct rpc_message *msg) 396 { 397 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 398 } 399 400 /* 401 * Special wrapper to nfs4_state_protect for write. 402 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 403 * that use machine cred use NFS_FILE_SYNC. 404 */ 405 static inline void 406 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 407 struct rpc_message *msg, struct nfs_pgio_header *hdr) 408 { 409 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 410 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 411 hdr->args.stable = NFS_FILE_SYNC; 412 } 413 #else /* CONFIG_NFS_v4_1 */ 414 static inline bool 415 is_ds_only_client(struct nfs_client *clp) 416 { 417 return false; 418 } 419 420 static inline bool 421 is_ds_client(struct nfs_client *clp) 422 { 423 return false; 424 } 425 426 static inline void 427 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 428 struct rpc_clnt **clntp, struct rpc_message *msg) 429 { 430 } 431 432 static inline void 433 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 434 struct rpc_message *msg, struct nfs_pgio_header *hdr) 435 { 436 } 437 #endif /* CONFIG_NFS_V4_1 */ 438 439 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 440 441 extern const u32 nfs4_fattr_bitmap[3]; 442 extern const u32 nfs4_statfs_bitmap[3]; 443 extern const u32 nfs4_pathconf_bitmap[3]; 444 extern const u32 nfs4_fsinfo_bitmap[3]; 445 extern const u32 nfs4_fs_locations_bitmap[3]; 446 447 void nfs40_shutdown_client(struct nfs_client *); 448 void nfs41_shutdown_client(struct nfs_client *); 449 int nfs40_init_client(struct nfs_client *); 450 int nfs41_init_client(struct nfs_client *); 451 void nfs4_free_client(struct nfs_client *); 452 453 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 454 455 /* nfs4renewd.c */ 456 extern void nfs4_schedule_state_renewal(struct nfs_client *); 457 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 458 extern void nfs4_kill_renewd(struct nfs_client *); 459 extern void nfs4_renew_state(struct work_struct *); 460 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 461 462 463 /* nfs4state.c */ 464 extern const nfs4_stateid current_stateid; 465 466 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 467 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 468 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 469 int nfs4_discover_server_trunking(struct nfs_client *clp, 470 struct nfs_client **); 471 int nfs40_discover_server_trunking(struct nfs_client *clp, 472 struct nfs_client **, const struct cred *); 473 #if defined(CONFIG_NFS_V4_1) 474 int nfs41_discover_server_trunking(struct nfs_client *clp, 475 struct nfs_client **, const struct cred *); 476 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 477 extern void nfs41_notify_server(struct nfs_client *); 478 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 479 struct nfs41_server_owner *o2); 480 #else 481 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 482 { 483 } 484 #endif /* CONFIG_NFS_V4_1 */ 485 486 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 487 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 488 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 489 extern void nfs4_free_state_owners(struct list_head *head); 490 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 491 extern void nfs4_put_open_state(struct nfs4_state *); 492 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 493 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 494 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 495 extern void nfs_inode_find_state_and_recover(struct inode *inode, 496 const nfs4_stateid *stateid); 497 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 498 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 499 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 500 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 501 extern void nfs4_schedule_state_manager(struct nfs_client *); 502 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 503 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 504 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 505 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 506 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 507 extern void nfs41_handle_server_scope(struct nfs_client *, 508 struct nfs41_server_scope **); 509 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 510 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 511 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 512 const struct nfs_lock_context *, nfs4_stateid *, 513 const struct cred **); 514 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 515 struct nfs4_state *state); 516 517 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 518 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 519 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 520 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 521 extern void nfs_release_seqid(struct nfs_seqid *seqid); 522 extern void nfs_free_seqid(struct nfs_seqid *seqid); 523 extern int nfs4_setup_sequence(struct nfs_client *client, 524 struct nfs4_sequence_args *args, 525 struct nfs4_sequence_res *res, 526 struct rpc_task *task); 527 extern int nfs4_sequence_done(struct rpc_task *task, 528 struct nfs4_sequence_res *res); 529 530 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 531 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 532 extern const nfs4_stateid zero_stateid; 533 extern const nfs4_stateid invalid_stateid; 534 535 /* nfs4super.c */ 536 struct nfs_mount_info; 537 extern struct nfs_subversion nfs_v4; 538 extern bool nfs4_disable_idmapping; 539 extern unsigned short max_session_slots; 540 extern unsigned short max_session_cb_slots; 541 extern unsigned short send_implementation_id; 542 extern bool recover_lost_locks; 543 544 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 545 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 546 547 extern int nfs4_try_get_tree(struct fs_context *); 548 extern int nfs4_get_referral_tree(struct fs_context *); 549 550 /* nfs4sysctl.c */ 551 #ifdef CONFIG_SYSCTL 552 int nfs4_register_sysctl(void); 553 void nfs4_unregister_sysctl(void); 554 #else 555 static inline int nfs4_register_sysctl(void) 556 { 557 return 0; 558 } 559 560 static inline void nfs4_unregister_sysctl(void) 561 { 562 } 563 #endif 564 565 /* nfs4xdr.c */ 566 extern const struct rpc_procinfo nfs4_procedures[]; 567 568 #ifdef CONFIG_NFS_V4_2 569 extern const u32 nfs42_maxsetxattr_overhead; 570 extern const u32 nfs42_maxgetxattr_overhead; 571 extern const u32 nfs42_maxlistxattrs_overhead; 572 #endif 573 574 struct nfs4_mount_data; 575 576 /* callback_xdr.c */ 577 extern const struct svc_version nfs4_callback_version1; 578 extern const struct svc_version nfs4_callback_version4; 579 580 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 581 { 582 memcpy(dst->data, src->data, sizeof(dst->data)); 583 dst->type = src->type; 584 } 585 586 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 587 { 588 if (dst->type != src->type) 589 return false; 590 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 591 } 592 593 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 594 { 595 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 596 } 597 598 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 599 { 600 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 601 } 602 603 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 604 { 605 u32 seq1 = be32_to_cpu(s1->seqid); 606 u32 seq2 = be32_to_cpu(s2->seqid); 607 608 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 609 } 610 611 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 612 { 613 return nfs4_stateid_match_other(dst, src) && 614 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 615 } 616 617 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 618 { 619 u32 seqid = be32_to_cpu(s1->seqid); 620 621 if (++seqid == 0) 622 ++seqid; 623 s1->seqid = cpu_to_be32(seqid); 624 } 625 626 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 627 { 628 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 629 } 630 631 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 632 const nfs4_stateid *stateid) 633 { 634 return test_bit(NFS_OPEN_STATE, &state->flags) && 635 nfs4_stateid_match_other(&state->open_stateid, stateid); 636 } 637 638 /* nfs42xattr.c */ 639 #ifdef CONFIG_NFS_V4_2 640 extern int __init nfs4_xattr_cache_init(void); 641 extern void nfs4_xattr_cache_exit(void); 642 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 643 const char *buf, struct page **pages, 644 ssize_t buflen); 645 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 646 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 647 char *buf, ssize_t buflen); 648 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 649 ssize_t buflen); 650 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 651 ssize_t buflen); 652 extern void nfs4_xattr_cache_zap(struct inode *inode); 653 #else 654 static inline void nfs4_xattr_cache_zap(struct inode *inode) 655 { 656 } 657 #endif /* CONFIG_NFS_V4_2 */ 658 659 #else /* CONFIG_NFS_V4 */ 660 661 #define nfs4_close_state(a, b) do { } while (0) 662 #define nfs4_close_sync(a, b) do { } while (0) 663 #define nfs4_state_protect(a, b, c, d) do { } while (0) 664 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 665 666 667 #endif /* CONFIG_NFS_V4 */ 668 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 669