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_spinlock_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 extern void nfs4_update_changeattr(struct inode *dir, 328 struct nfs4_change_info *cinfo, 329 unsigned long timestamp, 330 unsigned long cache_validity); 331 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 332 struct page **pages); 333 334 #if defined(CONFIG_NFS_V4_1) 335 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 336 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 337 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 338 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 339 bool sync); 340 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 341 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 342 343 static inline bool 344 is_ds_only_client(struct nfs_client *clp) 345 { 346 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 347 EXCHGID4_FLAG_USE_PNFS_DS; 348 } 349 350 static inline bool 351 is_ds_client(struct nfs_client *clp) 352 { 353 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 354 } 355 356 static inline bool 357 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 358 struct rpc_clnt **clntp, struct rpc_message *msg) 359 { 360 rpc_authflavor_t flavor; 361 362 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 363 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 364 /* Using machine creds for cleanup operations 365 * is only relevent if the client credentials 366 * might expire. So don't bother for 367 * RPC_AUTH_UNIX. If file was only exported to 368 * sec=sys, the PUTFH would fail anyway. 369 */ 370 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 371 return false; 372 } 373 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 374 msg->rpc_cred = rpc_machine_cred(); 375 376 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 377 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 378 flavor != RPC_AUTH_GSS_KRB5P); 379 *clntp = clp->cl_rpcclient; 380 381 return true; 382 } 383 return false; 384 } 385 386 /* 387 * Function responsible for determining if an rpc_message should use the 388 * machine cred under SP4_MACH_CRED and if so switching the credential and 389 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 390 * Should be called before rpc_call_sync/rpc_call_async. 391 */ 392 static inline void 393 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 394 struct rpc_clnt **clntp, struct rpc_message *msg) 395 { 396 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 397 } 398 399 /* 400 * Special wrapper to nfs4_state_protect for write. 401 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 402 * that use machine cred use NFS_FILE_SYNC. 403 */ 404 static inline void 405 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 406 struct rpc_message *msg, struct nfs_pgio_header *hdr) 407 { 408 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 409 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 410 hdr->args.stable = NFS_FILE_SYNC; 411 } 412 #else /* CONFIG_NFS_v4_1 */ 413 static inline bool 414 is_ds_only_client(struct nfs_client *clp) 415 { 416 return false; 417 } 418 419 static inline bool 420 is_ds_client(struct nfs_client *clp) 421 { 422 return false; 423 } 424 425 static inline void 426 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 427 struct rpc_clnt **clntp, struct rpc_message *msg) 428 { 429 } 430 431 static inline void 432 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 433 struct rpc_message *msg, struct nfs_pgio_header *hdr) 434 { 435 } 436 #endif /* CONFIG_NFS_V4_1 */ 437 438 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 439 440 extern const u32 nfs4_fattr_bitmap[3]; 441 extern const u32 nfs4_statfs_bitmap[3]; 442 extern const u32 nfs4_pathconf_bitmap[3]; 443 extern const u32 nfs4_fsinfo_bitmap[3]; 444 extern const u32 nfs4_fs_locations_bitmap[3]; 445 446 void nfs40_shutdown_client(struct nfs_client *); 447 void nfs41_shutdown_client(struct nfs_client *); 448 int nfs40_init_client(struct nfs_client *); 449 int nfs41_init_client(struct nfs_client *); 450 void nfs4_free_client(struct nfs_client *); 451 452 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 453 454 /* nfs4renewd.c */ 455 extern void nfs4_schedule_state_renewal(struct nfs_client *); 456 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 457 extern void nfs4_kill_renewd(struct nfs_client *); 458 extern void nfs4_renew_state(struct work_struct *); 459 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 460 461 462 /* nfs4state.c */ 463 extern const nfs4_stateid current_stateid; 464 465 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 466 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 467 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 468 int nfs4_discover_server_trunking(struct nfs_client *clp, 469 struct nfs_client **); 470 int nfs40_discover_server_trunking(struct nfs_client *clp, 471 struct nfs_client **, const struct cred *); 472 #if defined(CONFIG_NFS_V4_1) 473 int nfs41_discover_server_trunking(struct nfs_client *clp, 474 struct nfs_client **, const struct cred *); 475 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 476 extern void nfs41_notify_server(struct nfs_client *); 477 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 478 struct nfs41_server_owner *o2); 479 #else 480 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 481 { 482 } 483 #endif /* CONFIG_NFS_V4_1 */ 484 485 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 486 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 487 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 488 extern void nfs4_free_state_owners(struct list_head *head); 489 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 490 extern void nfs4_put_open_state(struct nfs4_state *); 491 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 492 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 493 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 494 extern void nfs_inode_find_state_and_recover(struct inode *inode, 495 const nfs4_stateid *stateid); 496 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 497 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 498 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 499 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 500 extern void nfs4_schedule_state_manager(struct nfs_client *); 501 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 502 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 503 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 504 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 505 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 506 extern void nfs41_handle_server_scope(struct nfs_client *, 507 struct nfs41_server_scope **); 508 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 509 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 510 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 511 const struct nfs_lock_context *, nfs4_stateid *, 512 const struct cred **); 513 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 514 struct nfs4_state *state); 515 516 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 517 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 518 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 519 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 520 extern void nfs_release_seqid(struct nfs_seqid *seqid); 521 extern void nfs_free_seqid(struct nfs_seqid *seqid); 522 extern int nfs4_setup_sequence(struct nfs_client *client, 523 struct nfs4_sequence_args *args, 524 struct nfs4_sequence_res *res, 525 struct rpc_task *task); 526 extern int nfs4_sequence_done(struct rpc_task *task, 527 struct nfs4_sequence_res *res); 528 529 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 530 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 531 extern const nfs4_stateid zero_stateid; 532 extern const nfs4_stateid invalid_stateid; 533 534 /* nfs4super.c */ 535 struct nfs_mount_info; 536 extern struct nfs_subversion nfs_v4; 537 extern bool nfs4_disable_idmapping; 538 extern unsigned short max_session_slots; 539 extern unsigned short max_session_cb_slots; 540 extern unsigned short send_implementation_id; 541 extern bool recover_lost_locks; 542 543 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 544 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 545 546 extern int nfs4_try_get_tree(struct fs_context *); 547 extern int nfs4_get_referral_tree(struct fs_context *); 548 549 /* nfs4sysctl.c */ 550 #ifdef CONFIG_SYSCTL 551 int nfs4_register_sysctl(void); 552 void nfs4_unregister_sysctl(void); 553 #else 554 static inline int nfs4_register_sysctl(void) 555 { 556 return 0; 557 } 558 559 static inline void nfs4_unregister_sysctl(void) 560 { 561 } 562 #endif 563 564 /* nfs4xdr.c */ 565 extern const struct rpc_procinfo nfs4_procedures[]; 566 567 #ifdef CONFIG_NFS_V4_2 568 extern const u32 nfs42_maxsetxattr_overhead; 569 extern const u32 nfs42_maxgetxattr_overhead; 570 extern const u32 nfs42_maxlistxattrs_overhead; 571 #endif 572 573 struct nfs4_mount_data; 574 575 /* callback_xdr.c */ 576 extern const struct svc_version nfs4_callback_version1; 577 extern const struct svc_version nfs4_callback_version4; 578 579 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 580 { 581 memcpy(dst->data, src->data, sizeof(dst->data)); 582 dst->type = src->type; 583 } 584 585 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 586 { 587 if (dst->type != src->type) 588 return false; 589 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 590 } 591 592 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 593 { 594 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 595 } 596 597 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 598 { 599 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 600 } 601 602 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 603 { 604 u32 seq1 = be32_to_cpu(s1->seqid); 605 u32 seq2 = be32_to_cpu(s2->seqid); 606 607 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 608 } 609 610 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 611 { 612 return nfs4_stateid_match_other(dst, src) && 613 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 614 } 615 616 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 617 { 618 u32 seqid = be32_to_cpu(s1->seqid); 619 620 if (++seqid == 0) 621 ++seqid; 622 s1->seqid = cpu_to_be32(seqid); 623 } 624 625 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 626 { 627 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 628 } 629 630 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 631 const nfs4_stateid *stateid) 632 { 633 return test_bit(NFS_OPEN_STATE, &state->flags) && 634 nfs4_stateid_match_other(&state->open_stateid, stateid); 635 } 636 637 /* nfs42xattr.c */ 638 #ifdef CONFIG_NFS_V4_2 639 extern int __init nfs4_xattr_cache_init(void); 640 extern void nfs4_xattr_cache_exit(void); 641 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 642 const char *buf, struct page **pages, 643 ssize_t buflen); 644 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 645 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 646 char *buf, ssize_t buflen); 647 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 648 ssize_t buflen); 649 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 650 ssize_t buflen); 651 extern void nfs4_xattr_cache_zap(struct inode *inode); 652 #else 653 static inline void nfs4_xattr_cache_zap(struct inode *inode) 654 { 655 } 656 #endif /* CONFIG_NFS_V4_2 */ 657 658 #else /* CONFIG_NFS_V4 */ 659 660 #define nfs4_close_state(a, b) do { } while (0) 661 #define nfs4_close_sync(a, b) do { } while (0) 662 #define nfs4_state_protect(a, b, c, d) do { } while (0) 663 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 664 665 666 #endif /* CONFIG_NFS_V4 */ 667 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 668