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_0) 14 #define NFS4_MIN_MINOR_VERSION 0 15 #else 16 #define NFS4_MIN_MINOR_VERSION 1 17 #endif 18 19 #if defined(CONFIG_NFS_V4_2) 20 #define NFS4_MAX_MINOR_VERSION 2 21 #else 22 #define NFS4_MAX_MINOR_VERSION 1 23 #endif 24 25 #if IS_ENABLED(CONFIG_NFS_V4) 26 27 #define NFS4_MAX_LOOP_ON_RECOVER (10) 28 29 #include <linux/seqlock.h> 30 #include <linux/filelock.h> 31 32 struct idmap; 33 34 enum nfs4_client_state { 35 NFS4CLNT_MANAGER_RUNNING = 0, 36 NFS4CLNT_CHECK_LEASE, 37 NFS4CLNT_LEASE_EXPIRED, 38 NFS4CLNT_RECLAIM_REBOOT, 39 NFS4CLNT_RECLAIM_NOGRACE, 40 NFS4CLNT_DELEGRETURN, 41 NFS4CLNT_SESSION_RESET, 42 NFS4CLNT_LEASE_CONFIRM, 43 NFS4CLNT_SERVER_SCOPE_MISMATCH, 44 NFS4CLNT_PURGE_STATE, 45 NFS4CLNT_BIND_CONN_TO_SESSION, 46 NFS4CLNT_MOVED, 47 NFS4CLNT_LEASE_MOVED, 48 NFS4CLNT_DELEGATION_EXPIRED, 49 NFS4CLNT_RUN_MANAGER, 50 NFS4CLNT_MANAGER_AVAILABLE, 51 NFS4CLNT_RECALL_RUNNING, 52 NFS4CLNT_RECALL_ANY_LAYOUT_READ, 53 NFS4CLNT_RECALL_ANY_LAYOUT_RW, 54 NFS4CLNT_DELEGRETURN_DELAYED, 55 }; 56 57 #define NFS4_RENEW_TIMEOUT 0x01 58 #define NFS4_RENEW_DELEGATION_CB 0x02 59 60 struct nfs_seqid_counter; 61 struct nfs4_minor_version_ops { 62 u32 minor_version; 63 unsigned init_caps; 64 65 int (*init_client)(struct nfs_client *); 66 void (*shutdown_client)(struct nfs_client *); 67 bool (*match_stateid)(const nfs4_stateid *, 68 const nfs4_stateid *); 69 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 70 struct nfs_fattr *); 71 void (*free_lock_state)(struct nfs_server *, 72 struct nfs4_lock_state *); 73 int (*test_and_free_expired)(struct nfs_server *, 74 nfs4_stateid *, const struct cred *); 75 struct nfs_seqid * 76 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 77 void (*session_trunk)(struct rpc_clnt *clnt, 78 struct rpc_xprt *xprt, void *data); 79 const struct rpc_call_ops *call_sync_ops; 80 const struct nfs4_sequence_slot_ops *sequence_slot_ops; 81 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 82 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 83 const struct nfs4_state_maintenance_ops *state_renewal_ops; 84 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 85 }; 86 87 #define NFS_SEQID_CONFIRMED 1 88 struct nfs_seqid_counter { 89 ktime_t create_time; 90 u64 owner_id; 91 int flags; 92 u32 counter; 93 spinlock_t lock; /* Protects the list */ 94 struct list_head list; /* Defines sequence of RPC calls */ 95 struct rpc_wait_queue wait; /* RPC call delay queue */ 96 }; 97 98 struct nfs_seqid { 99 struct nfs_seqid_counter *sequence; 100 struct list_head list; 101 struct rpc_task *task; 102 }; 103 104 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 105 { 106 if (seqid_mutating_err(-status)) 107 seqid->flags |= NFS_SEQID_CONFIRMED; 108 } 109 110 /* 111 * NFS4 state_owners and lock_owners are simply labels for ordered 112 * sequences of RPC calls. Their sole purpose is to provide once-only 113 * semantics by allowing the server to identify replayed requests. 114 */ 115 struct nfs4_state_owner { 116 struct nfs_server *so_server; 117 struct list_head so_lru; 118 unsigned long so_expires; 119 struct rb_node so_server_node; 120 121 const struct cred *so_cred; /* Associated cred */ 122 123 spinlock_t so_lock; 124 atomic_t so_count; 125 unsigned long so_flags; 126 struct list_head so_states; 127 struct nfs_seqid_counter so_seqid; 128 struct mutex so_delegreturn_mutex; 129 }; 130 131 enum { 132 NFS_OWNER_RECLAIM_REBOOT, 133 NFS_OWNER_RECLAIM_NOGRACE 134 }; 135 136 #define NFS_LOCK_NEW 0 137 #define NFS_LOCK_RECLAIM 1 138 #define NFS_LOCK_EXPIRED 2 139 140 /* 141 * struct nfs4_state maintains the client-side state for a given 142 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 143 * 144 * OPEN: 145 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 146 * we need to know how many files are open for reading or writing on a 147 * given inode. This information too is stored here. 148 * 149 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 150 */ 151 152 struct nfs4_lock_state { 153 struct list_head ls_locks; /* Other lock stateids */ 154 struct nfs4_state * ls_state; /* Pointer to open state */ 155 #define NFS_LOCK_INITIALIZED 0 156 #define NFS_LOCK_LOST 1 157 #define NFS_LOCK_UNLOCKING 2 158 unsigned long ls_flags; 159 struct nfs_seqid_counter ls_seqid; 160 nfs4_stateid ls_stateid; 161 refcount_t ls_count; 162 fl_owner_t ls_owner; 163 }; 164 165 /* bits for nfs4_state->flags */ 166 enum { 167 LK_STATE_IN_USE, 168 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 169 NFS_OPEN_STATE, /* OPEN stateid is set */ 170 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 171 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 172 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 173 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 174 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 175 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 176 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 177 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 178 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 179 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 180 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 181 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 182 }; 183 184 struct nfs4_state { 185 struct list_head open_states; /* List of states for the same state_owner */ 186 struct list_head inode_states; /* List of states for the same inode */ 187 struct list_head lock_states; /* List of subservient lock stateids */ 188 189 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 190 struct inode *inode; /* Pointer to the inode */ 191 192 unsigned long flags; /* Do we hold any locks? */ 193 spinlock_t state_lock; /* Protects the lock_states list */ 194 195 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 196 nfs4_stateid stateid; /* Current stateid: may be delegation */ 197 nfs4_stateid open_stateid; /* OPEN stateid */ 198 199 /* The following 3 fields are protected by owner->so_lock */ 200 unsigned int n_rdonly; /* Number of read-only references */ 201 unsigned int n_wronly; /* Number of write-only references */ 202 unsigned int n_rdwr; /* Number of read/write references */ 203 fmode_t state; /* State on the server (R,W, or RW) */ 204 refcount_t count; 205 206 wait_queue_head_t waitq; 207 struct rcu_head rcu_head; 208 }; 209 210 211 struct nfs4_exception { 212 struct nfs4_state *state; 213 struct inode *inode; 214 nfs4_stateid *stateid; 215 long timeout; 216 unsigned short retrans; 217 unsigned char task_is_privileged : 1; 218 unsigned char delay : 1, 219 recovering : 1, 220 retry : 1; 221 bool interruptible; 222 }; 223 224 struct nfs4_state_recovery_ops { 225 int owner_flag_bit; 226 int state_flag_bit; 227 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 228 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 229 int (*establish_clid)(struct nfs_client *, const struct cred *); 230 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 231 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 232 const struct cred *); 233 }; 234 235 struct nfs4_opendata { 236 struct kref kref; 237 struct nfs_openargs o_arg; 238 struct nfs_openres o_res; 239 struct nfs_open_confirmargs c_arg; 240 struct nfs_open_confirmres c_res; 241 struct nfs4_string owner_name; 242 struct nfs4_string group_name; 243 struct nfs4_label *a_label; 244 struct nfs_fattr f_attr; 245 struct dentry *dir; 246 struct dentry *dentry; 247 struct nfs4_state_owner *owner; 248 struct nfs4_state *state; 249 struct iattr attrs; 250 struct nfs4_layoutget *lgp; 251 unsigned long timestamp; 252 bool rpc_done; 253 bool file_created; 254 bool is_recover; 255 bool cancelled; 256 int rpc_status; 257 }; 258 259 struct nfs4_add_xprt_data { 260 struct nfs_client *clp; 261 const struct cred *cred; 262 }; 263 264 struct nfs4_sequence_slot_ops { 265 int (*process)(struct rpc_task *, struct nfs4_sequence_res *); 266 int (*done)(struct rpc_task *, struct nfs4_sequence_res *); 267 void (*free_slot)(struct nfs4_sequence_res *); 268 }; 269 270 struct nfs4_state_maintenance_ops { 271 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 272 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 273 int (*renew_lease)(struct nfs_client *, const struct cred *); 274 }; 275 276 struct nfs4_mig_recovery_ops { 277 int (*get_locations)(struct nfs_server *, struct nfs_fh *, 278 struct nfs4_fs_locations *, struct page *, const struct cred *); 279 int (*fsid_present)(struct inode *, const struct cred *); 280 }; 281 282 extern const struct dentry_operations nfs4_dentry_operations; 283 284 /* dir.c */ 285 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 286 unsigned, umode_t); 287 288 /* fs_context.c */ 289 extern struct file_system_type nfs4_fs_type; 290 291 /* nfs4client.c */ 292 struct nfs_net; 293 int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 294 struct nfs_client **prev, struct nfs_net *nn); 295 296 /* nfs4namespace.c */ 297 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 298 const struct qstr *); 299 int nfs4_submount(struct fs_context *, struct nfs_server *); 300 int nfs4_replace_transport(struct nfs_server *server, 301 const struct nfs4_fs_locations *locations); 302 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss, 303 size_t salen, struct net *net, int port); 304 /* nfs4proc.c */ 305 struct nfs4_call_sync_data { 306 const struct nfs_server *seq_server; 307 struct nfs4_sequence_args *seq_args; 308 struct nfs4_sequence_res *seq_res; 309 }; 310 311 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 312 extern int nfs4_async_handle_error(struct rpc_task *task, 313 struct nfs_server *server, 314 struct nfs4_state *state, long *timeout); 315 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 316 struct rpc_message *, struct nfs4_sequence_args *, 317 struct nfs4_sequence_res *, int); 318 extern int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 319 struct nfs_server *server, 320 struct rpc_message *msg, 321 struct nfs4_sequence_args *args, 322 struct nfs4_sequence_res *res); 323 extern void nfs4_init_sequence(struct nfs_client *clp, struct nfs4_sequence_args *, 324 struct nfs4_sequence_res *, int, int); 325 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 326 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 327 extern void renew_lease(const struct nfs_server *server, unsigned long timestamp); 328 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, 329 struct nfs_fattr *, bool); 330 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 331 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 332 extern int nfs4_destroy_clientid(struct nfs_client *clp); 333 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 334 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 335 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 336 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 337 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 338 struct nfs4_fs_locations *, struct page *); 339 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *, 340 struct nfs4_fs_locations *, 341 struct page *page, const struct cred *); 342 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 343 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 344 struct dentry *, 345 struct nfs_fh *, 346 struct nfs_fattr *); 347 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 348 extern const struct xattr_handler * const nfs4_xattr_handlers[]; 349 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 350 const struct nfs_open_context *ctx, 351 const struct nfs_lock_context *l_ctx, 352 fmode_t fmode); 353 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 354 struct inode *inode, unsigned long cache_validity); 355 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 356 struct nfs_fattr *fattr, struct inode *inode); 357 extern int update_open_stateid(struct nfs4_state *state, 358 const nfs4_stateid *open_stateid, 359 const nfs4_stateid *deleg_stateid, 360 fmode_t fmode); 361 extern int nfs4_proc_setlease(struct file *file, int arg, 362 struct file_lease **lease, void **priv); 363 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 364 struct nfs_fsinfo *fsinfo); 365 extern void nfs4_update_changeattr(struct inode *dir, 366 struct nfs4_change_info *cinfo, 367 unsigned long timestamp, 368 unsigned long cache_validity); 369 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 370 struct page **pages); 371 extern int nfs4_open_reclaim(struct nfs4_state_owner *, struct nfs4_state *); 372 extern int nfs4_open_expired(struct nfs4_state_owner *, struct nfs4_state *); 373 extern int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request); 374 extern int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request); 375 extern void nfs_state_clear_delegation(struct nfs4_state *state); 376 extern void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 377 const nfs4_stateid *stateid); 378 extern void nfs_state_clear_open_state_flags(struct nfs4_state *state); 379 extern void do_renew_lease(struct nfs_client *clp, unsigned long timestamp); 380 extern bool nfs4_match_stateid(const nfs4_stateid *s1, const nfs4_stateid *s2); 381 extern int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 382 struct nfs_fattr *fattr); 383 384 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 385 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 386 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 387 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 388 bool sync); 389 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 390 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 391 392 static inline bool 393 is_ds_only_client(struct nfs_client *clp) 394 { 395 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 396 EXCHGID4_FLAG_USE_PNFS_DS; 397 } 398 399 static inline bool 400 is_ds_client(struct nfs_client *clp) 401 { 402 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 403 } 404 405 static inline bool 406 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 407 struct rpc_clnt **clntp, struct rpc_message *msg) 408 { 409 rpc_authflavor_t flavor; 410 411 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 412 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 413 /* Using machine creds for cleanup operations 414 * is only relevent if the client credentials 415 * might expire. So don't bother for 416 * RPC_AUTH_UNIX. If file was only exported to 417 * sec=sys, the PUTFH would fail anyway. 418 */ 419 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 420 return false; 421 } 422 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 423 msg->rpc_cred = rpc_machine_cred(); 424 425 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 426 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 427 flavor != RPC_AUTH_GSS_KRB5P); 428 *clntp = clp->cl_rpcclient; 429 430 return true; 431 } 432 return false; 433 } 434 435 /* 436 * Function responsible for determining if an rpc_message should use the 437 * machine cred under SP4_MACH_CRED and if so switching the credential and 438 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 439 * Should be called before rpc_call_sync/rpc_call_async. 440 */ 441 static inline void 442 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 443 struct rpc_clnt **clntp, struct rpc_message *msg) 444 { 445 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 446 } 447 448 /* 449 * Special wrapper to nfs4_state_protect for write. 450 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 451 * that use machine cred use NFS_FILE_SYNC. 452 */ 453 static inline void 454 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 455 struct rpc_message *msg, struct nfs_pgio_header *hdr) 456 { 457 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 458 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 459 hdr->args.stable = NFS_FILE_SYNC; 460 } 461 462 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 463 464 extern const u32 nfs4_fattr_bitmap[3]; 465 extern const u32 nfs4_statfs_bitmap[3]; 466 extern const u32 nfs4_pathconf_bitmap[3]; 467 extern const u32 nfs4_fsinfo_bitmap[3]; 468 extern const u32 nfs4_fs_locations_bitmap[3]; 469 470 void nfs41_shutdown_client(struct nfs_client *); 471 int nfs41_init_client(struct nfs_client *); 472 void nfs4_free_client(struct nfs_client *); 473 474 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 475 476 /* nfs4renewd.c */ 477 extern void nfs4_schedule_state_renewal(struct nfs_client *); 478 extern void nfs4_kill_renewd(struct nfs_client *); 479 extern void nfs4_renew_state(struct work_struct *); 480 extern void nfs4_set_lease_period(struct nfs_client *clp, u32 period); 481 482 /* nfs4state.c */ 483 extern const nfs4_stateid current_stateid; 484 485 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 486 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 487 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 488 int nfs4_discover_server_trunking(struct nfs_client *clp, 489 struct nfs_client **); 490 int nfs40_discover_server_trunking(struct nfs_client *clp, 491 struct nfs_client **, const struct cred *); 492 int nfs41_discover_server_trunking(struct nfs_client *clp, 493 struct nfs_client **, const struct cred *); 494 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 495 extern void nfs41_notify_server(struct nfs_client *); 496 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 497 struct nfs41_server_owner *o2); 498 499 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 500 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 501 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 502 extern void nfs4_free_state_owners(struct list_head *head); 503 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 504 extern void nfs4_put_open_state(struct nfs4_state *); 505 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 506 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 507 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 508 extern void nfs_inode_find_state_and_recover(struct inode *inode, 509 const nfs4_stateid *stateid); 510 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 511 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 512 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 513 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 514 extern void nfs4_schedule_state_manager(struct nfs_client *); 515 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 516 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 517 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 518 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 519 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 520 extern void nfs41_handle_server_scope(struct nfs_client *, 521 struct nfs41_server_scope **); 522 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 523 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 524 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 525 const struct nfs_lock_context *, nfs4_stateid *, 526 const struct cred **); 527 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 528 struct nfs4_state *state); 529 530 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 531 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 532 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 533 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 534 extern void nfs_release_seqid(struct nfs_seqid *seqid); 535 extern void nfs_free_seqid(struct nfs_seqid *seqid); 536 extern int nfs4_setup_sequence(struct nfs_client *client, 537 struct nfs4_sequence_args *args, 538 struct nfs4_sequence_res *res, 539 struct rpc_task *task); 540 extern int nfs4_sequence_done(struct rpc_task *task, 541 struct nfs4_sequence_res *res); 542 543 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 544 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 545 extern const nfs4_stateid zero_stateid; 546 extern const nfs4_stateid invalid_stateid; 547 548 /* nfs4super.c */ 549 struct nfs_mount_info; 550 extern struct nfs_subversion nfs_v4; 551 extern bool nfs4_disable_idmapping; 552 extern unsigned short max_session_slots; 553 extern unsigned short max_session_cb_slots; 554 extern unsigned short send_implementation_id; 555 extern bool recover_lost_locks; 556 extern short nfs_delay_retrans; 557 558 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 559 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 560 561 extern int nfs4_try_get_tree(struct fs_context *); 562 extern int nfs4_get_referral_tree(struct fs_context *); 563 564 /* nfs4sysctl.c */ 565 #ifdef CONFIG_SYSCTL 566 int nfs4_register_sysctl(void); 567 void nfs4_unregister_sysctl(void); 568 #else 569 static inline int nfs4_register_sysctl(void) 570 { 571 return 0; 572 } 573 574 static inline void nfs4_unregister_sysctl(void) 575 { 576 } 577 #endif 578 579 /* nfs4xdr.c */ 580 extern const struct rpc_procinfo nfs4_procedures[]; 581 582 #ifdef CONFIG_NFS_V4_2 583 extern const u32 nfs42_maxsetxattr_overhead; 584 extern const u32 nfs42_maxgetxattr_overhead; 585 extern const u32 nfs42_maxlistxattrs_overhead; 586 #endif 587 588 struct nfs4_mount_data; 589 590 /* callback_xdr.c */ 591 extern const struct svc_version nfs4_callback_version1; 592 extern const struct svc_version nfs4_callback_version4; 593 594 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 595 { 596 memcpy(dst->data, src->data, sizeof(dst->data)); 597 dst->type = src->type; 598 } 599 600 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 601 { 602 if (dst->type != src->type) 603 return false; 604 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 605 } 606 607 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 608 { 609 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 610 } 611 612 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 613 { 614 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 615 } 616 617 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 618 { 619 u32 seq1 = be32_to_cpu(s1->seqid); 620 u32 seq2 = be32_to_cpu(s2->seqid); 621 622 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 623 } 624 625 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 626 { 627 return nfs4_stateid_match_other(dst, src) && 628 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 629 } 630 631 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 632 { 633 u32 seqid = be32_to_cpu(s1->seqid); 634 635 if (++seqid == 0) 636 ++seqid; 637 s1->seqid = cpu_to_be32(seqid); 638 } 639 640 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 641 { 642 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 643 } 644 645 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 646 const nfs4_stateid *stateid) 647 { 648 return test_bit(NFS_OPEN_STATE, &state->flags) && 649 nfs4_stateid_match_other(&state->open_stateid, stateid); 650 } 651 652 /* nfs42xattr.c */ 653 #ifdef CONFIG_NFS_V4_2 654 extern int __init nfs4_xattr_cache_init(void); 655 extern void nfs4_xattr_cache_exit(void); 656 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 657 const char *buf, struct page **pages, 658 ssize_t buflen); 659 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 660 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 661 char *buf, ssize_t buflen); 662 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 663 ssize_t buflen); 664 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 665 ssize_t buflen); 666 extern void nfs4_xattr_cache_zap(struct inode *inode); 667 #else 668 static inline void nfs4_xattr_cache_zap(struct inode *inode) 669 { 670 } 671 #endif /* CONFIG_NFS_V4_2 */ 672 673 #else /* CONFIG_NFS_V4 */ 674 675 #define nfs4_close_state(a, b) do { } while (0) 676 #define nfs4_close_sync(a, b) do { } while (0) 677 #define nfs4_state_protect(a, b, c, d) do { } while (0) 678 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 679 680 681 #endif /* CONFIG_NFS_V4 */ 682 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 683