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_MANAGER_AVAILABLE, 46 NFS4CLNT_RECALL_RUNNING, 47 NFS4CLNT_RECALL_ANY_LAYOUT_READ, 48 NFS4CLNT_RECALL_ANY_LAYOUT_RW, 49 NFS4CLNT_DELEGRETURN_DELAYED, 50 }; 51 52 #define NFS4_RENEW_TIMEOUT 0x01 53 #define NFS4_RENEW_DELEGATION_CB 0x02 54 55 struct nfs_seqid_counter; 56 struct nfs4_minor_version_ops { 57 u32 minor_version; 58 unsigned init_caps; 59 60 int (*init_client)(struct nfs_client *); 61 void (*shutdown_client)(struct nfs_client *); 62 bool (*match_stateid)(const nfs4_stateid *, 63 const nfs4_stateid *); 64 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 65 struct nfs_fsinfo *); 66 void (*free_lock_state)(struct nfs_server *, 67 struct nfs4_lock_state *); 68 int (*test_and_free_expired)(struct nfs_server *, 69 nfs4_stateid *, const struct cred *); 70 struct nfs_seqid * 71 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 72 void (*session_trunk)(struct rpc_clnt *clnt, 73 struct rpc_xprt *xprt, void *data); 74 const struct rpc_call_ops *call_sync_ops; 75 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 76 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 77 const struct nfs4_state_maintenance_ops *state_renewal_ops; 78 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 79 }; 80 81 #define NFS_SEQID_CONFIRMED 1 82 struct nfs_seqid_counter { 83 ktime_t create_time; 84 int owner_id; 85 int flags; 86 u32 counter; 87 spinlock_t lock; /* Protects the list */ 88 struct list_head list; /* Defines sequence of RPC calls */ 89 struct rpc_wait_queue wait; /* RPC call delay queue */ 90 }; 91 92 struct nfs_seqid { 93 struct nfs_seqid_counter *sequence; 94 struct list_head list; 95 struct rpc_task *task; 96 }; 97 98 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 99 { 100 if (seqid_mutating_err(-status)) 101 seqid->flags |= NFS_SEQID_CONFIRMED; 102 } 103 104 /* 105 * NFS4 state_owners and lock_owners are simply labels for ordered 106 * sequences of RPC calls. Their sole purpose is to provide once-only 107 * semantics by allowing the server to identify replayed requests. 108 */ 109 struct nfs4_state_owner { 110 struct nfs_server *so_server; 111 struct list_head so_lru; 112 unsigned long so_expires; 113 struct rb_node so_server_node; 114 115 const struct cred *so_cred; /* Associated cred */ 116 117 spinlock_t so_lock; 118 atomic_t so_count; 119 unsigned long so_flags; 120 struct list_head so_states; 121 struct nfs_seqid_counter so_seqid; 122 seqcount_spinlock_t so_reclaim_seqcount; 123 struct mutex so_delegreturn_mutex; 124 }; 125 126 enum { 127 NFS_OWNER_RECLAIM_REBOOT, 128 NFS_OWNER_RECLAIM_NOGRACE 129 }; 130 131 #define NFS_LOCK_NEW 0 132 #define NFS_LOCK_RECLAIM 1 133 #define NFS_LOCK_EXPIRED 2 134 135 /* 136 * struct nfs4_state maintains the client-side state for a given 137 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 138 * 139 * OPEN: 140 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 141 * we need to know how many files are open for reading or writing on a 142 * given inode. This information too is stored here. 143 * 144 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 145 */ 146 147 struct nfs4_lock_state { 148 struct list_head ls_locks; /* Other lock stateids */ 149 struct nfs4_state * ls_state; /* Pointer to open state */ 150 #define NFS_LOCK_INITIALIZED 0 151 #define NFS_LOCK_LOST 1 152 #define NFS_LOCK_UNLOCKING 2 153 unsigned long ls_flags; 154 struct nfs_seqid_counter ls_seqid; 155 nfs4_stateid ls_stateid; 156 refcount_t ls_count; 157 fl_owner_t ls_owner; 158 }; 159 160 /* bits for nfs4_state->flags */ 161 enum { 162 LK_STATE_IN_USE, 163 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 164 NFS_OPEN_STATE, /* OPEN stateid is set */ 165 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 166 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 167 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 168 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 169 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 170 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 171 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 172 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 173 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 174 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 175 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 176 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 177 }; 178 179 struct nfs4_state { 180 struct list_head open_states; /* List of states for the same state_owner */ 181 struct list_head inode_states; /* List of states for the same inode */ 182 struct list_head lock_states; /* List of subservient lock stateids */ 183 184 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 185 struct inode *inode; /* Pointer to the inode */ 186 187 unsigned long flags; /* Do we hold any locks? */ 188 spinlock_t state_lock; /* Protects the lock_states list */ 189 190 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 191 nfs4_stateid stateid; /* Current stateid: may be delegation */ 192 nfs4_stateid open_stateid; /* OPEN stateid */ 193 194 /* The following 3 fields are protected by owner->so_lock */ 195 unsigned int n_rdonly; /* Number of read-only references */ 196 unsigned int n_wronly; /* Number of write-only references */ 197 unsigned int n_rdwr; /* Number of read/write references */ 198 fmode_t state; /* State on the server (R,W, or RW) */ 199 refcount_t count; 200 201 wait_queue_head_t waitq; 202 struct rcu_head rcu_head; 203 }; 204 205 206 struct nfs4_exception { 207 struct nfs4_state *state; 208 struct inode *inode; 209 nfs4_stateid *stateid; 210 long timeout; 211 unsigned char task_is_privileged : 1; 212 unsigned char delay : 1, 213 recovering : 1, 214 retry : 1; 215 bool interruptible; 216 }; 217 218 struct nfs4_state_recovery_ops { 219 int owner_flag_bit; 220 int state_flag_bit; 221 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 222 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 223 int (*establish_clid)(struct nfs_client *, const struct cred *); 224 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 225 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 226 const struct cred *); 227 }; 228 229 struct nfs4_opendata { 230 struct kref kref; 231 struct nfs_openargs o_arg; 232 struct nfs_openres o_res; 233 struct nfs_open_confirmargs c_arg; 234 struct nfs_open_confirmres c_res; 235 struct nfs4_string owner_name; 236 struct nfs4_string group_name; 237 struct nfs4_label *a_label; 238 struct nfs_fattr f_attr; 239 struct dentry *dir; 240 struct dentry *dentry; 241 struct nfs4_state_owner *owner; 242 struct nfs4_state *state; 243 struct iattr attrs; 244 struct nfs4_layoutget *lgp; 245 unsigned long timestamp; 246 bool rpc_done; 247 bool file_created; 248 bool is_recover; 249 bool cancelled; 250 int rpc_status; 251 }; 252 253 struct nfs4_add_xprt_data { 254 struct nfs_client *clp; 255 const struct cred *cred; 256 }; 257 258 struct nfs4_state_maintenance_ops { 259 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 260 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 261 int (*renew_lease)(struct nfs_client *, const struct cred *); 262 }; 263 264 struct nfs4_mig_recovery_ops { 265 int (*get_locations)(struct nfs_server *, struct nfs_fh *, 266 struct nfs4_fs_locations *, struct page *, const struct cred *); 267 int (*fsid_present)(struct inode *, const struct cred *); 268 }; 269 270 extern const struct dentry_operations nfs4_dentry_operations; 271 272 /* dir.c */ 273 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 274 unsigned, umode_t); 275 276 /* fs_context.c */ 277 extern struct file_system_type nfs4_fs_type; 278 279 /* nfs4namespace.c */ 280 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 281 const struct qstr *); 282 int nfs4_submount(struct fs_context *, struct nfs_server *); 283 int nfs4_replace_transport(struct nfs_server *server, 284 const struct nfs4_fs_locations *locations); 285 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss, 286 size_t salen, struct net *net, int port); 287 /* nfs4proc.c */ 288 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 289 extern int nfs4_async_handle_error(struct rpc_task *task, 290 struct nfs_server *server, 291 struct nfs4_state *state, long *timeout); 292 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 293 struct rpc_message *, struct nfs4_sequence_args *, 294 struct nfs4_sequence_res *, int); 295 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 296 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 297 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 298 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 299 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 300 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 301 extern int nfs4_destroy_clientid(struct nfs_client *clp); 302 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 303 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 304 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 305 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 306 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 307 struct nfs4_fs_locations *, struct page *); 308 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *, 309 struct nfs4_fs_locations *, 310 struct page *page, const struct cred *); 311 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 312 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 313 struct dentry *, 314 struct nfs_fh *, 315 struct nfs_fattr *); 316 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 317 extern const struct xattr_handler *nfs4_xattr_handlers[]; 318 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 319 const struct nfs_open_context *ctx, 320 const struct nfs_lock_context *l_ctx, 321 fmode_t fmode); 322 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 323 struct inode *inode, unsigned long cache_validity); 324 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 325 struct nfs_fattr *fattr, struct inode *inode); 326 extern int update_open_stateid(struct nfs4_state *state, 327 const nfs4_stateid *open_stateid, 328 const nfs4_stateid *deleg_stateid, 329 fmode_t fmode); 330 extern int nfs4_proc_setlease(struct file *file, long arg, 331 struct file_lock **lease, void **priv); 332 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 333 struct nfs_fsinfo *fsinfo); 334 extern void nfs4_update_changeattr(struct inode *dir, 335 struct nfs4_change_info *cinfo, 336 unsigned long timestamp, 337 unsigned long cache_validity); 338 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 339 struct page **pages); 340 341 #if defined(CONFIG_NFS_V4_1) 342 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 343 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 344 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 345 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 346 bool sync); 347 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 348 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 349 350 static inline bool 351 is_ds_only_client(struct nfs_client *clp) 352 { 353 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 354 EXCHGID4_FLAG_USE_PNFS_DS; 355 } 356 357 static inline bool 358 is_ds_client(struct nfs_client *clp) 359 { 360 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 361 } 362 363 static inline bool 364 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 365 struct rpc_clnt **clntp, struct rpc_message *msg) 366 { 367 rpc_authflavor_t flavor; 368 369 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 370 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 371 /* Using machine creds for cleanup operations 372 * is only relevent if the client credentials 373 * might expire. So don't bother for 374 * RPC_AUTH_UNIX. If file was only exported to 375 * sec=sys, the PUTFH would fail anyway. 376 */ 377 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 378 return false; 379 } 380 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 381 msg->rpc_cred = rpc_machine_cred(); 382 383 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 384 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 385 flavor != RPC_AUTH_GSS_KRB5P); 386 *clntp = clp->cl_rpcclient; 387 388 return true; 389 } 390 return false; 391 } 392 393 /* 394 * Function responsible for determining if an rpc_message should use the 395 * machine cred under SP4_MACH_CRED and if so switching the credential and 396 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 397 * Should be called before rpc_call_sync/rpc_call_async. 398 */ 399 static inline void 400 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 401 struct rpc_clnt **clntp, struct rpc_message *msg) 402 { 403 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 404 } 405 406 /* 407 * Special wrapper to nfs4_state_protect for write. 408 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 409 * that use machine cred use NFS_FILE_SYNC. 410 */ 411 static inline void 412 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 413 struct rpc_message *msg, struct nfs_pgio_header *hdr) 414 { 415 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 416 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 417 hdr->args.stable = NFS_FILE_SYNC; 418 } 419 #else /* CONFIG_NFS_v4_1 */ 420 static inline bool 421 is_ds_only_client(struct nfs_client *clp) 422 { 423 return false; 424 } 425 426 static inline bool 427 is_ds_client(struct nfs_client *clp) 428 { 429 return false; 430 } 431 432 static inline void 433 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 434 struct rpc_clnt **clntp, struct rpc_message *msg) 435 { 436 } 437 438 static inline void 439 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 440 struct rpc_message *msg, struct nfs_pgio_header *hdr) 441 { 442 } 443 #endif /* CONFIG_NFS_V4_1 */ 444 445 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 446 447 extern const u32 nfs4_fattr_bitmap[3]; 448 extern const u32 nfs4_statfs_bitmap[3]; 449 extern const u32 nfs4_pathconf_bitmap[3]; 450 extern const u32 nfs4_fsinfo_bitmap[3]; 451 extern const u32 nfs4_fs_locations_bitmap[3]; 452 453 void nfs40_shutdown_client(struct nfs_client *); 454 void nfs41_shutdown_client(struct nfs_client *); 455 int nfs40_init_client(struct nfs_client *); 456 int nfs41_init_client(struct nfs_client *); 457 void nfs4_free_client(struct nfs_client *); 458 459 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 460 461 /* nfs4renewd.c */ 462 extern void nfs4_schedule_state_renewal(struct nfs_client *); 463 extern void nfs4_kill_renewd(struct nfs_client *); 464 extern void nfs4_renew_state(struct work_struct *); 465 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 466 467 468 /* nfs4state.c */ 469 extern const nfs4_stateid current_stateid; 470 471 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 472 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 473 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 474 int nfs4_discover_server_trunking(struct nfs_client *clp, 475 struct nfs_client **); 476 int nfs40_discover_server_trunking(struct nfs_client *clp, 477 struct nfs_client **, const struct cred *); 478 #if defined(CONFIG_NFS_V4_1) 479 int nfs41_discover_server_trunking(struct nfs_client *clp, 480 struct nfs_client **, const struct cred *); 481 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 482 extern void nfs41_notify_server(struct nfs_client *); 483 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 484 struct nfs41_server_owner *o2); 485 #else 486 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 487 { 488 } 489 #endif /* CONFIG_NFS_V4_1 */ 490 491 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 492 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 493 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 494 extern void nfs4_free_state_owners(struct list_head *head); 495 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 496 extern void nfs4_put_open_state(struct nfs4_state *); 497 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 498 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 499 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 500 extern void nfs_inode_find_state_and_recover(struct inode *inode, 501 const nfs4_stateid *stateid); 502 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 503 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 504 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 505 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 506 extern void nfs4_schedule_state_manager(struct nfs_client *); 507 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 508 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 509 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 510 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 511 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 512 extern void nfs41_handle_server_scope(struct nfs_client *, 513 struct nfs41_server_scope **); 514 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 515 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 516 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 517 const struct nfs_lock_context *, nfs4_stateid *, 518 const struct cred **); 519 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 520 struct nfs4_state *state); 521 522 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 523 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 524 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 525 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 526 extern void nfs_release_seqid(struct nfs_seqid *seqid); 527 extern void nfs_free_seqid(struct nfs_seqid *seqid); 528 extern int nfs4_setup_sequence(struct nfs_client *client, 529 struct nfs4_sequence_args *args, 530 struct nfs4_sequence_res *res, 531 struct rpc_task *task); 532 extern int nfs4_sequence_done(struct rpc_task *task, 533 struct nfs4_sequence_res *res); 534 535 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 536 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 537 extern const nfs4_stateid zero_stateid; 538 extern const nfs4_stateid invalid_stateid; 539 540 /* nfs4super.c */ 541 struct nfs_mount_info; 542 extern struct nfs_subversion nfs_v4; 543 extern bool nfs4_disable_idmapping; 544 extern unsigned short max_session_slots; 545 extern unsigned short max_session_cb_slots; 546 extern unsigned short send_implementation_id; 547 extern bool recover_lost_locks; 548 549 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 550 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 551 552 extern int nfs4_try_get_tree(struct fs_context *); 553 extern int nfs4_get_referral_tree(struct fs_context *); 554 555 /* nfs4sysctl.c */ 556 #ifdef CONFIG_SYSCTL 557 int nfs4_register_sysctl(void); 558 void nfs4_unregister_sysctl(void); 559 #else 560 static inline int nfs4_register_sysctl(void) 561 { 562 return 0; 563 } 564 565 static inline void nfs4_unregister_sysctl(void) 566 { 567 } 568 #endif 569 570 /* nfs4xdr.c */ 571 extern const struct rpc_procinfo nfs4_procedures[]; 572 573 #ifdef CONFIG_NFS_V4_2 574 extern const u32 nfs42_maxsetxattr_overhead; 575 extern const u32 nfs42_maxgetxattr_overhead; 576 extern const u32 nfs42_maxlistxattrs_overhead; 577 #endif 578 579 struct nfs4_mount_data; 580 581 /* callback_xdr.c */ 582 extern const struct svc_version nfs4_callback_version1; 583 extern const struct svc_version nfs4_callback_version4; 584 585 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 586 { 587 memcpy(dst->data, src->data, sizeof(dst->data)); 588 dst->type = src->type; 589 } 590 591 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 592 { 593 if (dst->type != src->type) 594 return false; 595 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 596 } 597 598 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 599 { 600 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 601 } 602 603 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 604 { 605 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 606 } 607 608 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 609 { 610 u32 seq1 = be32_to_cpu(s1->seqid); 611 u32 seq2 = be32_to_cpu(s2->seqid); 612 613 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 614 } 615 616 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 617 { 618 return nfs4_stateid_match_other(dst, src) && 619 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 620 } 621 622 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 623 { 624 u32 seqid = be32_to_cpu(s1->seqid); 625 626 if (++seqid == 0) 627 ++seqid; 628 s1->seqid = cpu_to_be32(seqid); 629 } 630 631 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 632 { 633 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 634 } 635 636 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 637 const nfs4_stateid *stateid) 638 { 639 return test_bit(NFS_OPEN_STATE, &state->flags) && 640 nfs4_stateid_match_other(&state->open_stateid, stateid); 641 } 642 643 /* nfs42xattr.c */ 644 #ifdef CONFIG_NFS_V4_2 645 extern int __init nfs4_xattr_cache_init(void); 646 extern void nfs4_xattr_cache_exit(void); 647 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 648 const char *buf, struct page **pages, 649 ssize_t buflen); 650 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 651 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 652 char *buf, ssize_t buflen); 653 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 654 ssize_t buflen); 655 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 656 ssize_t buflen); 657 extern void nfs4_xattr_cache_zap(struct inode *inode); 658 #else 659 static inline void nfs4_xattr_cache_zap(struct inode *inode) 660 { 661 } 662 #endif /* CONFIG_NFS_V4_2 */ 663 664 #else /* CONFIG_NFS_V4 */ 665 666 #define nfs4_close_state(a, b) do { } while (0) 667 #define nfs4_close_sync(a, b) do { } while (0) 668 #define nfs4_state_protect(a, b, c, d) do { } while (0) 669 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 670 671 672 #endif /* CONFIG_NFS_V4 */ 673 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 674