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 nfs4_label *f_label; 238 struct dentry *dir; 239 struct dentry *dentry; 240 struct nfs4_state_owner *owner; 241 struct nfs4_state *state; 242 struct iattr attrs; 243 struct nfs4_layoutget *lgp; 244 unsigned long timestamp; 245 bool rpc_done; 246 bool file_created; 247 bool is_recover; 248 bool cancelled; 249 int rpc_status; 250 }; 251 252 struct nfs4_add_xprt_data { 253 struct nfs_client *clp; 254 const struct cred *cred; 255 }; 256 257 struct nfs4_state_maintenance_ops { 258 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 259 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 260 int (*renew_lease)(struct nfs_client *, const struct cred *); 261 }; 262 263 struct nfs4_mig_recovery_ops { 264 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 265 struct page *, const struct cred *); 266 int (*fsid_present)(struct inode *, const struct cred *); 267 }; 268 269 extern const struct dentry_operations nfs4_dentry_operations; 270 271 /* dir.c */ 272 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 273 unsigned, umode_t); 274 275 /* fs_context.c */ 276 extern struct file_system_type nfs4_fs_type; 277 278 /* nfs4namespace.c */ 279 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 280 const struct qstr *); 281 int nfs4_submount(struct fs_context *, struct nfs_server *); 282 int nfs4_replace_transport(struct nfs_server *server, 283 const struct nfs4_fs_locations *locations); 284 285 /* nfs4proc.c */ 286 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 287 extern int nfs4_async_handle_error(struct rpc_task *task, 288 struct nfs_server *server, 289 struct nfs4_state *state, long *timeout); 290 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 291 struct rpc_message *, struct nfs4_sequence_args *, 292 struct nfs4_sequence_res *, int); 293 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 294 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 295 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 296 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 297 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 298 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 299 extern int nfs4_destroy_clientid(struct nfs_client *clp); 300 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 301 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 302 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 303 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 304 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 305 struct nfs4_fs_locations *, struct page *); 306 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 307 struct page *page, const struct cred *); 308 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 309 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 310 struct dentry *, 311 struct nfs_fh *, 312 struct nfs_fattr *); 313 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 314 extern const struct xattr_handler *nfs4_xattr_handlers[]; 315 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 316 const struct nfs_open_context *ctx, 317 const struct nfs_lock_context *l_ctx, 318 fmode_t fmode); 319 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 320 struct nfs_fattr *fattr, struct nfs4_label *label, 321 struct inode *inode); 322 extern int update_open_stateid(struct nfs4_state *state, 323 const nfs4_stateid *open_stateid, 324 const nfs4_stateid *deleg_stateid, 325 fmode_t fmode); 326 extern int nfs4_proc_setlease(struct file *file, long arg, 327 struct file_lock **lease, void **priv); 328 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 329 struct nfs_fsinfo *fsinfo); 330 extern void nfs4_update_changeattr(struct inode *dir, 331 struct nfs4_change_info *cinfo, 332 unsigned long timestamp, 333 unsigned long cache_validity); 334 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 335 struct page **pages); 336 337 #if defined(CONFIG_NFS_V4_1) 338 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 339 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 340 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 341 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 342 bool sync); 343 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 344 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 345 346 static inline bool 347 is_ds_only_client(struct nfs_client *clp) 348 { 349 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 350 EXCHGID4_FLAG_USE_PNFS_DS; 351 } 352 353 static inline bool 354 is_ds_client(struct nfs_client *clp) 355 { 356 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 357 } 358 359 static inline bool 360 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 361 struct rpc_clnt **clntp, struct rpc_message *msg) 362 { 363 rpc_authflavor_t flavor; 364 365 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 366 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 367 /* Using machine creds for cleanup operations 368 * is only relevent if the client credentials 369 * might expire. So don't bother for 370 * RPC_AUTH_UNIX. If file was only exported to 371 * sec=sys, the PUTFH would fail anyway. 372 */ 373 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 374 return false; 375 } 376 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 377 msg->rpc_cred = rpc_machine_cred(); 378 379 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 380 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 381 flavor != RPC_AUTH_GSS_KRB5P); 382 *clntp = clp->cl_rpcclient; 383 384 return true; 385 } 386 return false; 387 } 388 389 /* 390 * Function responsible for determining if an rpc_message should use the 391 * machine cred under SP4_MACH_CRED and if so switching the credential and 392 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 393 * Should be called before rpc_call_sync/rpc_call_async. 394 */ 395 static inline void 396 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 397 struct rpc_clnt **clntp, struct rpc_message *msg) 398 { 399 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 400 } 401 402 /* 403 * Special wrapper to nfs4_state_protect for write. 404 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 405 * that use machine cred use NFS_FILE_SYNC. 406 */ 407 static inline void 408 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 409 struct rpc_message *msg, struct nfs_pgio_header *hdr) 410 { 411 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 412 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 413 hdr->args.stable = NFS_FILE_SYNC; 414 } 415 #else /* CONFIG_NFS_v4_1 */ 416 static inline bool 417 is_ds_only_client(struct nfs_client *clp) 418 { 419 return false; 420 } 421 422 static inline bool 423 is_ds_client(struct nfs_client *clp) 424 { 425 return false; 426 } 427 428 static inline void 429 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 430 struct rpc_clnt **clntp, struct rpc_message *msg) 431 { 432 } 433 434 static inline void 435 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 436 struct rpc_message *msg, struct nfs_pgio_header *hdr) 437 { 438 } 439 #endif /* CONFIG_NFS_V4_1 */ 440 441 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 442 443 extern const u32 nfs4_fattr_bitmap[3]; 444 extern const u32 nfs4_statfs_bitmap[3]; 445 extern const u32 nfs4_pathconf_bitmap[3]; 446 extern const u32 nfs4_fsinfo_bitmap[3]; 447 extern const u32 nfs4_fs_locations_bitmap[3]; 448 449 void nfs40_shutdown_client(struct nfs_client *); 450 void nfs41_shutdown_client(struct nfs_client *); 451 int nfs40_init_client(struct nfs_client *); 452 int nfs41_init_client(struct nfs_client *); 453 void nfs4_free_client(struct nfs_client *); 454 455 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 456 457 /* nfs4renewd.c */ 458 extern void nfs4_schedule_state_renewal(struct nfs_client *); 459 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 460 extern void nfs4_kill_renewd(struct nfs_client *); 461 extern void nfs4_renew_state(struct work_struct *); 462 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 463 464 465 /* nfs4state.c */ 466 extern const nfs4_stateid current_stateid; 467 468 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 469 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 470 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 471 int nfs4_discover_server_trunking(struct nfs_client *clp, 472 struct nfs_client **); 473 int nfs40_discover_server_trunking(struct nfs_client *clp, 474 struct nfs_client **, const struct cred *); 475 #if defined(CONFIG_NFS_V4_1) 476 int nfs41_discover_server_trunking(struct nfs_client *clp, 477 struct nfs_client **, const struct cred *); 478 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 479 extern void nfs41_notify_server(struct nfs_client *); 480 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 481 struct nfs41_server_owner *o2); 482 #else 483 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 484 { 485 } 486 #endif /* CONFIG_NFS_V4_1 */ 487 488 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 489 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 490 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 491 extern void nfs4_free_state_owners(struct list_head *head); 492 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 493 extern void nfs4_put_open_state(struct nfs4_state *); 494 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 495 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 496 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 497 extern void nfs_inode_find_state_and_recover(struct inode *inode, 498 const nfs4_stateid *stateid); 499 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 500 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 501 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 502 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 503 extern void nfs4_schedule_state_manager(struct nfs_client *); 504 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 505 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 506 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 507 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 508 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 509 extern void nfs41_handle_server_scope(struct nfs_client *, 510 struct nfs41_server_scope **); 511 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 512 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 513 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 514 const struct nfs_lock_context *, nfs4_stateid *, 515 const struct cred **); 516 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 517 struct nfs4_state *state); 518 519 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 520 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 521 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 522 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 523 extern void nfs_release_seqid(struct nfs_seqid *seqid); 524 extern void nfs_free_seqid(struct nfs_seqid *seqid); 525 extern int nfs4_setup_sequence(struct nfs_client *client, 526 struct nfs4_sequence_args *args, 527 struct nfs4_sequence_res *res, 528 struct rpc_task *task); 529 extern int nfs4_sequence_done(struct rpc_task *task, 530 struct nfs4_sequence_res *res); 531 532 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 533 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 534 extern const nfs4_stateid zero_stateid; 535 extern const nfs4_stateid invalid_stateid; 536 537 /* nfs4super.c */ 538 struct nfs_mount_info; 539 extern struct nfs_subversion nfs_v4; 540 extern bool nfs4_disable_idmapping; 541 extern unsigned short max_session_slots; 542 extern unsigned short max_session_cb_slots; 543 extern unsigned short send_implementation_id; 544 extern bool recover_lost_locks; 545 546 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 547 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 548 549 extern int nfs4_try_get_tree(struct fs_context *); 550 extern int nfs4_get_referral_tree(struct fs_context *); 551 552 /* nfs4sysctl.c */ 553 #ifdef CONFIG_SYSCTL 554 int nfs4_register_sysctl(void); 555 void nfs4_unregister_sysctl(void); 556 #else 557 static inline int nfs4_register_sysctl(void) 558 { 559 return 0; 560 } 561 562 static inline void nfs4_unregister_sysctl(void) 563 { 564 } 565 #endif 566 567 /* nfs4xdr.c */ 568 extern const struct rpc_procinfo nfs4_procedures[]; 569 570 #ifdef CONFIG_NFS_V4_2 571 extern const u32 nfs42_maxsetxattr_overhead; 572 extern const u32 nfs42_maxgetxattr_overhead; 573 extern const u32 nfs42_maxlistxattrs_overhead; 574 #endif 575 576 struct nfs4_mount_data; 577 578 /* callback_xdr.c */ 579 extern const struct svc_version nfs4_callback_version1; 580 extern const struct svc_version nfs4_callback_version4; 581 582 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 583 { 584 memcpy(dst->data, src->data, sizeof(dst->data)); 585 dst->type = src->type; 586 } 587 588 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 589 { 590 if (dst->type != src->type) 591 return false; 592 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 593 } 594 595 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 596 { 597 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 598 } 599 600 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 601 { 602 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 603 } 604 605 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 606 { 607 u32 seq1 = be32_to_cpu(s1->seqid); 608 u32 seq2 = be32_to_cpu(s2->seqid); 609 610 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 611 } 612 613 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 614 { 615 return nfs4_stateid_match_other(dst, src) && 616 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 617 } 618 619 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 620 { 621 u32 seqid = be32_to_cpu(s1->seqid); 622 623 if (++seqid == 0) 624 ++seqid; 625 s1->seqid = cpu_to_be32(seqid); 626 } 627 628 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 629 { 630 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 631 } 632 633 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 634 const nfs4_stateid *stateid) 635 { 636 return test_bit(NFS_OPEN_STATE, &state->flags) && 637 nfs4_stateid_match_other(&state->open_stateid, stateid); 638 } 639 640 /* nfs42xattr.c */ 641 #ifdef CONFIG_NFS_V4_2 642 extern int __init nfs4_xattr_cache_init(void); 643 extern void nfs4_xattr_cache_exit(void); 644 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 645 const char *buf, struct page **pages, 646 ssize_t buflen); 647 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 648 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 649 char *buf, ssize_t buflen); 650 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 651 ssize_t buflen); 652 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 653 ssize_t buflen); 654 extern void nfs4_xattr_cache_zap(struct inode *inode); 655 #else 656 static inline void nfs4_xattr_cache_zap(struct inode *inode) 657 { 658 } 659 #endif /* CONFIG_NFS_V4_2 */ 660 661 #else /* CONFIG_NFS_V4 */ 662 663 #define nfs4_close_state(a, b) do { } while (0) 664 #define nfs4_close_sync(a, b) do { } while (0) 665 #define nfs4_state_protect(a, b, c, d) do { } while (0) 666 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 667 668 669 #endif /* CONFIG_NFS_V4 */ 670 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 671