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 #include <linux/filelock.h> 27 28 struct idmap; 29 30 enum nfs4_client_state { 31 NFS4CLNT_MANAGER_RUNNING = 0, 32 NFS4CLNT_CHECK_LEASE, 33 NFS4CLNT_LEASE_EXPIRED, 34 NFS4CLNT_RECLAIM_REBOOT, 35 NFS4CLNT_RECLAIM_NOGRACE, 36 NFS4CLNT_DELEGRETURN, 37 NFS4CLNT_SESSION_RESET, 38 NFS4CLNT_LEASE_CONFIRM, 39 NFS4CLNT_SERVER_SCOPE_MISMATCH, 40 NFS4CLNT_PURGE_STATE, 41 NFS4CLNT_BIND_CONN_TO_SESSION, 42 NFS4CLNT_MOVED, 43 NFS4CLNT_LEASE_MOVED, 44 NFS4CLNT_DELEGATION_EXPIRED, 45 NFS4CLNT_RUN_MANAGER, 46 NFS4CLNT_MANAGER_AVAILABLE, 47 NFS4CLNT_RECALL_RUNNING, 48 NFS4CLNT_RECALL_ANY_LAYOUT_READ, 49 NFS4CLNT_RECALL_ANY_LAYOUT_RW, 50 NFS4CLNT_DELEGRETURN_DELAYED, 51 }; 52 53 #define NFS4_RENEW_TIMEOUT 0x01 54 #define NFS4_RENEW_DELEGATION_CB 0x02 55 56 struct nfs_seqid_counter; 57 struct nfs4_minor_version_ops { 58 u32 minor_version; 59 unsigned init_caps; 60 61 int (*init_client)(struct nfs_client *); 62 void (*shutdown_client)(struct nfs_client *); 63 bool (*match_stateid)(const nfs4_stateid *, 64 const nfs4_stateid *); 65 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 66 struct nfs_fsinfo *); 67 void (*free_lock_state)(struct nfs_server *, 68 struct nfs4_lock_state *); 69 int (*test_and_free_expired)(struct nfs_server *, 70 nfs4_stateid *, const struct cred *); 71 struct nfs_seqid * 72 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 73 void (*session_trunk)(struct rpc_clnt *clnt, 74 struct rpc_xprt *xprt, void *data); 75 const struct rpc_call_ops *call_sync_ops; 76 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 77 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 78 const struct nfs4_state_maintenance_ops *state_renewal_ops; 79 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 80 }; 81 82 #define NFS_SEQID_CONFIRMED 1 83 struct nfs_seqid_counter { 84 ktime_t create_time; 85 int owner_id; 86 int flags; 87 u32 counter; 88 spinlock_t lock; /* Protects the list */ 89 struct list_head list; /* Defines sequence of RPC calls */ 90 struct rpc_wait_queue wait; /* RPC call delay queue */ 91 }; 92 93 struct nfs_seqid { 94 struct nfs_seqid_counter *sequence; 95 struct list_head list; 96 struct rpc_task *task; 97 }; 98 99 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 100 { 101 if (seqid_mutating_err(-status)) 102 seqid->flags |= NFS_SEQID_CONFIRMED; 103 } 104 105 /* 106 * NFS4 state_owners and lock_owners are simply labels for ordered 107 * sequences of RPC calls. Their sole purpose is to provide once-only 108 * semantics by allowing the server to identify replayed requests. 109 */ 110 struct nfs4_state_owner { 111 struct nfs_server *so_server; 112 struct list_head so_lru; 113 unsigned long so_expires; 114 struct rb_node so_server_node; 115 116 const struct cred *so_cred; /* Associated cred */ 117 118 spinlock_t so_lock; 119 atomic_t so_count; 120 unsigned long so_flags; 121 struct list_head so_states; 122 struct nfs_seqid_counter so_seqid; 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 short retrans; 212 unsigned char task_is_privileged : 1; 213 unsigned char delay : 1, 214 recovering : 1, 215 retry : 1; 216 bool interruptible; 217 }; 218 219 struct nfs4_state_recovery_ops { 220 int owner_flag_bit; 221 int state_flag_bit; 222 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 223 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 224 int (*establish_clid)(struct nfs_client *, const struct cred *); 225 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 226 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 227 const struct cred *); 228 }; 229 230 struct nfs4_opendata { 231 struct kref kref; 232 struct nfs_openargs o_arg; 233 struct nfs_openres o_res; 234 struct nfs_open_confirmargs c_arg; 235 struct nfs_open_confirmres c_res; 236 struct nfs4_string owner_name; 237 struct nfs4_string group_name; 238 struct nfs4_label *a_label; 239 struct nfs_fattr f_attr; 240 struct dentry *dir; 241 struct dentry *dentry; 242 struct nfs4_state_owner *owner; 243 struct nfs4_state *state; 244 struct iattr attrs; 245 struct nfs4_layoutget *lgp; 246 unsigned long timestamp; 247 bool rpc_done; 248 bool file_created; 249 bool is_recover; 250 bool cancelled; 251 int rpc_status; 252 }; 253 254 struct nfs4_add_xprt_data { 255 struct nfs_client *clp; 256 const struct cred *cred; 257 }; 258 259 struct nfs4_state_maintenance_ops { 260 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 261 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 262 int (*renew_lease)(struct nfs_client *, const struct cred *); 263 }; 264 265 struct nfs4_mig_recovery_ops { 266 int (*get_locations)(struct nfs_server *, struct nfs_fh *, 267 struct nfs4_fs_locations *, struct page *, const struct cred *); 268 int (*fsid_present)(struct inode *, const struct cred *); 269 }; 270 271 extern const struct dentry_operations nfs4_dentry_operations; 272 273 /* dir.c */ 274 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 275 unsigned, umode_t); 276 277 /* fs_context.c */ 278 extern struct file_system_type nfs4_fs_type; 279 280 /* nfs4namespace.c */ 281 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 282 const struct qstr *); 283 int nfs4_submount(struct fs_context *, struct nfs_server *); 284 int nfs4_replace_transport(struct nfs_server *server, 285 const struct nfs4_fs_locations *locations); 286 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss, 287 size_t salen, struct net *net, int port); 288 /* nfs4proc.c */ 289 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 290 extern int nfs4_async_handle_error(struct rpc_task *task, 291 struct nfs_server *server, 292 struct nfs4_state *state, long *timeout); 293 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 294 struct rpc_message *, struct nfs4_sequence_args *, 295 struct nfs4_sequence_res *, int); 296 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 297 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 298 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 299 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 300 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 301 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 302 extern int nfs4_destroy_clientid(struct nfs_client *clp); 303 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 304 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 305 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 306 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 307 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 308 struct nfs4_fs_locations *, struct page *); 309 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *, 310 struct nfs4_fs_locations *, 311 struct page *page, const struct cred *); 312 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 313 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 314 struct dentry *, 315 struct nfs_fh *, 316 struct nfs_fattr *); 317 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 318 extern const struct xattr_handler * const nfs4_xattr_handlers[]; 319 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 320 const struct nfs_open_context *ctx, 321 const struct nfs_lock_context *l_ctx, 322 fmode_t fmode); 323 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 324 struct inode *inode, unsigned long cache_validity); 325 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 326 struct nfs_fattr *fattr, struct inode *inode); 327 extern int update_open_stateid(struct nfs4_state *state, 328 const nfs4_stateid *open_stateid, 329 const nfs4_stateid *deleg_stateid, 330 fmode_t fmode); 331 extern int nfs4_proc_setlease(struct file *file, int arg, 332 struct file_lease **lease, void **priv); 333 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 334 struct nfs_fsinfo *fsinfo); 335 extern void nfs4_update_changeattr(struct inode *dir, 336 struct nfs4_change_info *cinfo, 337 unsigned long timestamp, 338 unsigned long cache_validity); 339 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 340 struct page **pages); 341 342 #if defined(CONFIG_NFS_V4_1) 343 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 344 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 345 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 346 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 347 bool sync); 348 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 349 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 350 351 static inline bool 352 is_ds_only_client(struct nfs_client *clp) 353 { 354 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 355 EXCHGID4_FLAG_USE_PNFS_DS; 356 } 357 358 static inline bool 359 is_ds_client(struct nfs_client *clp) 360 { 361 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 362 } 363 364 static inline bool 365 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 366 struct rpc_clnt **clntp, struct rpc_message *msg) 367 { 368 rpc_authflavor_t flavor; 369 370 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 371 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 372 /* Using machine creds for cleanup operations 373 * is only relevent if the client credentials 374 * might expire. So don't bother for 375 * RPC_AUTH_UNIX. If file was only exported to 376 * sec=sys, the PUTFH would fail anyway. 377 */ 378 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 379 return false; 380 } 381 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 382 msg->rpc_cred = rpc_machine_cred(); 383 384 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 385 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 386 flavor != RPC_AUTH_GSS_KRB5P); 387 *clntp = clp->cl_rpcclient; 388 389 return true; 390 } 391 return false; 392 } 393 394 /* 395 * Function responsible for determining if an rpc_message should use the 396 * machine cred under SP4_MACH_CRED and if so switching the credential and 397 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 398 * Should be called before rpc_call_sync/rpc_call_async. 399 */ 400 static inline void 401 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 402 struct rpc_clnt **clntp, struct rpc_message *msg) 403 { 404 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 405 } 406 407 /* 408 * Special wrapper to nfs4_state_protect for write. 409 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 410 * that use machine cred use NFS_FILE_SYNC. 411 */ 412 static inline void 413 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 414 struct rpc_message *msg, struct nfs_pgio_header *hdr) 415 { 416 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 417 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 418 hdr->args.stable = NFS_FILE_SYNC; 419 } 420 #else /* CONFIG_NFS_v4_1 */ 421 static inline bool 422 is_ds_only_client(struct nfs_client *clp) 423 { 424 return false; 425 } 426 427 static inline bool 428 is_ds_client(struct nfs_client *clp) 429 { 430 return false; 431 } 432 433 static inline void 434 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 435 struct rpc_clnt **clntp, struct rpc_message *msg) 436 { 437 } 438 439 static inline void 440 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 441 struct rpc_message *msg, struct nfs_pgio_header *hdr) 442 { 443 } 444 #endif /* CONFIG_NFS_V4_1 */ 445 446 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 447 448 extern const u32 nfs4_fattr_bitmap[3]; 449 extern const u32 nfs4_statfs_bitmap[3]; 450 extern const u32 nfs4_pathconf_bitmap[3]; 451 extern const u32 nfs4_fsinfo_bitmap[3]; 452 extern const u32 nfs4_fs_locations_bitmap[3]; 453 454 void nfs40_shutdown_client(struct nfs_client *); 455 void nfs41_shutdown_client(struct nfs_client *); 456 int nfs40_init_client(struct nfs_client *); 457 int nfs41_init_client(struct nfs_client *); 458 void nfs4_free_client(struct nfs_client *); 459 460 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 461 462 /* nfs4renewd.c */ 463 extern void nfs4_schedule_state_renewal(struct nfs_client *); 464 extern void nfs4_kill_renewd(struct nfs_client *); 465 extern void nfs4_renew_state(struct work_struct *); 466 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 467 468 469 /* nfs4state.c */ 470 extern const nfs4_stateid current_stateid; 471 472 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 473 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 474 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 475 int nfs4_discover_server_trunking(struct nfs_client *clp, 476 struct nfs_client **); 477 int nfs40_discover_server_trunking(struct nfs_client *clp, 478 struct nfs_client **, const struct cred *); 479 #if defined(CONFIG_NFS_V4_1) 480 int nfs41_discover_server_trunking(struct nfs_client *clp, 481 struct nfs_client **, const struct cred *); 482 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 483 extern void nfs41_notify_server(struct nfs_client *); 484 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 485 struct nfs41_server_owner *o2); 486 #else 487 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 488 { 489 } 490 #endif /* CONFIG_NFS_V4_1 */ 491 492 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 493 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 494 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 495 extern void nfs4_free_state_owners(struct list_head *head); 496 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 497 extern void nfs4_put_open_state(struct nfs4_state *); 498 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 499 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 500 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 501 extern void nfs_inode_find_state_and_recover(struct inode *inode, 502 const nfs4_stateid *stateid); 503 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 504 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 505 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 506 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 507 extern void nfs4_schedule_state_manager(struct nfs_client *); 508 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 509 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 510 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 511 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 512 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 513 extern void nfs41_handle_server_scope(struct nfs_client *, 514 struct nfs41_server_scope **); 515 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 516 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 517 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 518 const struct nfs_lock_context *, nfs4_stateid *, 519 const struct cred **); 520 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 521 struct nfs4_state *state); 522 523 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 524 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 525 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 526 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 527 extern void nfs_release_seqid(struct nfs_seqid *seqid); 528 extern void nfs_free_seqid(struct nfs_seqid *seqid); 529 extern int nfs4_setup_sequence(struct nfs_client *client, 530 struct nfs4_sequence_args *args, 531 struct nfs4_sequence_res *res, 532 struct rpc_task *task); 533 extern int nfs4_sequence_done(struct rpc_task *task, 534 struct nfs4_sequence_res *res); 535 536 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 537 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 538 extern const nfs4_stateid zero_stateid; 539 extern const nfs4_stateid invalid_stateid; 540 541 /* nfs4super.c */ 542 struct nfs_mount_info; 543 extern struct nfs_subversion nfs_v4; 544 extern bool nfs4_disable_idmapping; 545 extern unsigned short max_session_slots; 546 extern unsigned short max_session_cb_slots; 547 extern unsigned short send_implementation_id; 548 extern bool recover_lost_locks; 549 extern short nfs_delay_retrans; 550 551 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 552 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 553 554 extern int nfs4_try_get_tree(struct fs_context *); 555 extern int nfs4_get_referral_tree(struct fs_context *); 556 557 /* nfs4sysctl.c */ 558 #ifdef CONFIG_SYSCTL 559 int nfs4_register_sysctl(void); 560 void nfs4_unregister_sysctl(void); 561 #else 562 static inline int nfs4_register_sysctl(void) 563 { 564 return 0; 565 } 566 567 static inline void nfs4_unregister_sysctl(void) 568 { 569 } 570 #endif 571 572 /* nfs4xdr.c */ 573 extern const struct rpc_procinfo nfs4_procedures[]; 574 575 #ifdef CONFIG_NFS_V4_2 576 extern const u32 nfs42_maxsetxattr_overhead; 577 extern const u32 nfs42_maxgetxattr_overhead; 578 extern const u32 nfs42_maxlistxattrs_overhead; 579 #endif 580 581 struct nfs4_mount_data; 582 583 /* callback_xdr.c */ 584 extern const struct svc_version nfs4_callback_version1; 585 extern const struct svc_version nfs4_callback_version4; 586 587 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 588 { 589 memcpy(dst->data, src->data, sizeof(dst->data)); 590 dst->type = src->type; 591 } 592 593 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 594 { 595 if (dst->type != src->type) 596 return false; 597 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 598 } 599 600 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 601 { 602 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 603 } 604 605 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 606 { 607 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 608 } 609 610 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 611 { 612 u32 seq1 = be32_to_cpu(s1->seqid); 613 u32 seq2 = be32_to_cpu(s2->seqid); 614 615 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 616 } 617 618 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 619 { 620 return nfs4_stateid_match_other(dst, src) && 621 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 622 } 623 624 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 625 { 626 u32 seqid = be32_to_cpu(s1->seqid); 627 628 if (++seqid == 0) 629 ++seqid; 630 s1->seqid = cpu_to_be32(seqid); 631 } 632 633 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 634 { 635 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 636 } 637 638 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 639 const nfs4_stateid *stateid) 640 { 641 return test_bit(NFS_OPEN_STATE, &state->flags) && 642 nfs4_stateid_match_other(&state->open_stateid, stateid); 643 } 644 645 /* nfs42xattr.c */ 646 #ifdef CONFIG_NFS_V4_2 647 extern int __init nfs4_xattr_cache_init(void); 648 extern void nfs4_xattr_cache_exit(void); 649 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 650 const char *buf, struct page **pages, 651 ssize_t buflen); 652 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 653 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 654 char *buf, ssize_t buflen); 655 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 656 ssize_t buflen); 657 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 658 ssize_t buflen); 659 extern void nfs4_xattr_cache_zap(struct inode *inode); 660 #else 661 static inline void nfs4_xattr_cache_zap(struct inode *inode) 662 { 663 } 664 #endif /* CONFIG_NFS_V4_2 */ 665 666 #else /* CONFIG_NFS_V4 */ 667 668 #define nfs4_close_state(a, b) do { } while (0) 669 #define nfs4_close_sync(a, b) do { } while (0) 670 #define nfs4_state_protect(a, b, c, d) do { } while (0) 671 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 672 673 674 #endif /* CONFIG_NFS_V4 */ 675 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 676