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 seqcount_spinlock_t so_reclaim_seqcount; 124 struct mutex so_delegreturn_mutex; 125 }; 126 127 enum { 128 NFS_OWNER_RECLAIM_REBOOT, 129 NFS_OWNER_RECLAIM_NOGRACE 130 }; 131 132 #define NFS_LOCK_NEW 0 133 #define NFS_LOCK_RECLAIM 1 134 #define NFS_LOCK_EXPIRED 2 135 136 /* 137 * struct nfs4_state maintains the client-side state for a given 138 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 139 * 140 * OPEN: 141 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 142 * we need to know how many files are open for reading or writing on a 143 * given inode. This information too is stored here. 144 * 145 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 146 */ 147 148 struct nfs4_lock_state { 149 struct list_head ls_locks; /* Other lock stateids */ 150 struct nfs4_state * ls_state; /* Pointer to open state */ 151 #define NFS_LOCK_INITIALIZED 0 152 #define NFS_LOCK_LOST 1 153 #define NFS_LOCK_UNLOCKING 2 154 unsigned long ls_flags; 155 struct nfs_seqid_counter ls_seqid; 156 nfs4_stateid ls_stateid; 157 refcount_t ls_count; 158 fl_owner_t ls_owner; 159 }; 160 161 /* bits for nfs4_state->flags */ 162 enum { 163 LK_STATE_IN_USE, 164 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 165 NFS_OPEN_STATE, /* OPEN stateid is set */ 166 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 167 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 168 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 169 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 170 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 171 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 172 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 173 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 174 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 175 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 176 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 177 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 178 }; 179 180 struct nfs4_state { 181 struct list_head open_states; /* List of states for the same state_owner */ 182 struct list_head inode_states; /* List of states for the same inode */ 183 struct list_head lock_states; /* List of subservient lock stateids */ 184 185 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 186 struct inode *inode; /* Pointer to the inode */ 187 188 unsigned long flags; /* Do we hold any locks? */ 189 spinlock_t state_lock; /* Protects the lock_states list */ 190 191 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 192 nfs4_stateid stateid; /* Current stateid: may be delegation */ 193 nfs4_stateid open_stateid; /* OPEN stateid */ 194 195 /* The following 3 fields are protected by owner->so_lock */ 196 unsigned int n_rdonly; /* Number of read-only references */ 197 unsigned int n_wronly; /* Number of write-only references */ 198 unsigned int n_rdwr; /* Number of read/write references */ 199 fmode_t state; /* State on the server (R,W, or RW) */ 200 refcount_t count; 201 202 wait_queue_head_t waitq; 203 struct rcu_head rcu_head; 204 }; 205 206 207 struct nfs4_exception { 208 struct nfs4_state *state; 209 struct inode *inode; 210 nfs4_stateid *stateid; 211 long timeout; 212 unsigned short retrans; 213 unsigned char task_is_privileged : 1; 214 unsigned char delay : 1, 215 recovering : 1, 216 retry : 1; 217 bool interruptible; 218 }; 219 220 struct nfs4_state_recovery_ops { 221 int owner_flag_bit; 222 int state_flag_bit; 223 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 224 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 225 int (*establish_clid)(struct nfs_client *, const struct cred *); 226 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 227 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 228 const struct cred *); 229 }; 230 231 struct nfs4_opendata { 232 struct kref kref; 233 struct nfs_openargs o_arg; 234 struct nfs_openres o_res; 235 struct nfs_open_confirmargs c_arg; 236 struct nfs_open_confirmres c_res; 237 struct nfs4_string owner_name; 238 struct nfs4_string group_name; 239 struct nfs4_label *a_label; 240 struct nfs_fattr f_attr; 241 struct dentry *dir; 242 struct dentry *dentry; 243 struct nfs4_state_owner *owner; 244 struct nfs4_state *state; 245 struct iattr attrs; 246 struct nfs4_layoutget *lgp; 247 unsigned long timestamp; 248 bool rpc_done; 249 bool file_created; 250 bool is_recover; 251 bool cancelled; 252 int rpc_status; 253 }; 254 255 struct nfs4_add_xprt_data { 256 struct nfs_client *clp; 257 const struct cred *cred; 258 }; 259 260 struct nfs4_state_maintenance_ops { 261 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 262 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 263 int (*renew_lease)(struct nfs_client *, const struct cred *); 264 }; 265 266 struct nfs4_mig_recovery_ops { 267 int (*get_locations)(struct nfs_server *, struct nfs_fh *, 268 struct nfs4_fs_locations *, struct page *, const struct cred *); 269 int (*fsid_present)(struct inode *, const struct cred *); 270 }; 271 272 extern const struct dentry_operations nfs4_dentry_operations; 273 274 /* dir.c */ 275 int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 276 unsigned, umode_t); 277 278 /* fs_context.c */ 279 extern struct file_system_type nfs4_fs_type; 280 281 /* nfs4namespace.c */ 282 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 283 const struct qstr *); 284 int nfs4_submount(struct fs_context *, struct nfs_server *); 285 int nfs4_replace_transport(struct nfs_server *server, 286 const struct nfs4_fs_locations *locations); 287 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss, 288 size_t salen, struct net *net, int port); 289 /* nfs4proc.c */ 290 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 291 extern int nfs4_async_handle_error(struct rpc_task *task, 292 struct nfs_server *server, 293 struct nfs4_state *state, long *timeout); 294 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 295 struct rpc_message *, struct nfs4_sequence_args *, 296 struct nfs4_sequence_res *, int); 297 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 298 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 299 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 300 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 301 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 302 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 303 extern int nfs4_destroy_clientid(struct nfs_client *clp); 304 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 305 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 306 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 307 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 308 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 309 struct nfs4_fs_locations *, struct page *); 310 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *, 311 struct nfs4_fs_locations *, 312 struct page *page, const struct cred *); 313 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 314 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 315 struct dentry *, 316 struct nfs_fh *, 317 struct nfs_fattr *); 318 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 319 extern const struct xattr_handler * const nfs4_xattr_handlers[]; 320 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 321 const struct nfs_open_context *ctx, 322 const struct nfs_lock_context *l_ctx, 323 fmode_t fmode); 324 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 325 struct inode *inode, unsigned long cache_validity); 326 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 327 struct nfs_fattr *fattr, struct inode *inode); 328 extern int update_open_stateid(struct nfs4_state *state, 329 const nfs4_stateid *open_stateid, 330 const nfs4_stateid *deleg_stateid, 331 fmode_t fmode); 332 extern int nfs4_proc_setlease(struct file *file, int arg, 333 struct file_lock **lease, void **priv); 334 extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 335 struct nfs_fsinfo *fsinfo); 336 extern void nfs4_update_changeattr(struct inode *dir, 337 struct nfs4_change_info *cinfo, 338 unsigned long timestamp, 339 unsigned long cache_validity); 340 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 341 struct page **pages); 342 343 #if defined(CONFIG_NFS_V4_1) 344 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 345 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 346 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 347 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 348 bool sync); 349 extern int nfs4_detect_session_trunking(struct nfs_client *clp, 350 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 351 352 static inline bool 353 is_ds_only_client(struct nfs_client *clp) 354 { 355 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 356 EXCHGID4_FLAG_USE_PNFS_DS; 357 } 358 359 static inline bool 360 is_ds_client(struct nfs_client *clp) 361 { 362 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 363 } 364 365 static inline bool 366 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 367 struct rpc_clnt **clntp, struct rpc_message *msg) 368 { 369 rpc_authflavor_t flavor; 370 371 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 372 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 373 /* Using machine creds for cleanup operations 374 * is only relevent if the client credentials 375 * might expire. So don't bother for 376 * RPC_AUTH_UNIX. If file was only exported to 377 * sec=sys, the PUTFH would fail anyway. 378 */ 379 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 380 return false; 381 } 382 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 383 msg->rpc_cred = rpc_machine_cred(); 384 385 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 386 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 387 flavor != RPC_AUTH_GSS_KRB5P); 388 *clntp = clp->cl_rpcclient; 389 390 return true; 391 } 392 return false; 393 } 394 395 /* 396 * Function responsible for determining if an rpc_message should use the 397 * machine cred under SP4_MACH_CRED and if so switching the credential and 398 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 399 * Should be called before rpc_call_sync/rpc_call_async. 400 */ 401 static inline void 402 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 403 struct rpc_clnt **clntp, struct rpc_message *msg) 404 { 405 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 406 } 407 408 /* 409 * Special wrapper to nfs4_state_protect for write. 410 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 411 * that use machine cred use NFS_FILE_SYNC. 412 */ 413 static inline void 414 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 415 struct rpc_message *msg, struct nfs_pgio_header *hdr) 416 { 417 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 418 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 419 hdr->args.stable = NFS_FILE_SYNC; 420 } 421 #else /* CONFIG_NFS_v4_1 */ 422 static inline bool 423 is_ds_only_client(struct nfs_client *clp) 424 { 425 return false; 426 } 427 428 static inline bool 429 is_ds_client(struct nfs_client *clp) 430 { 431 return false; 432 } 433 434 static inline void 435 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 436 struct rpc_clnt **clntp, struct rpc_message *msg) 437 { 438 } 439 440 static inline void 441 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 442 struct rpc_message *msg, struct nfs_pgio_header *hdr) 443 { 444 } 445 #endif /* CONFIG_NFS_V4_1 */ 446 447 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 448 449 extern const u32 nfs4_fattr_bitmap[3]; 450 extern const u32 nfs4_statfs_bitmap[3]; 451 extern const u32 nfs4_pathconf_bitmap[3]; 452 extern const u32 nfs4_fsinfo_bitmap[3]; 453 extern const u32 nfs4_fs_locations_bitmap[3]; 454 455 void nfs40_shutdown_client(struct nfs_client *); 456 void nfs41_shutdown_client(struct nfs_client *); 457 int nfs40_init_client(struct nfs_client *); 458 int nfs41_init_client(struct nfs_client *); 459 void nfs4_free_client(struct nfs_client *); 460 461 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 462 463 /* nfs4renewd.c */ 464 extern void nfs4_schedule_state_renewal(struct nfs_client *); 465 extern void nfs4_kill_renewd(struct nfs_client *); 466 extern void nfs4_renew_state(struct work_struct *); 467 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 468 469 470 /* nfs4state.c */ 471 extern const nfs4_stateid current_stateid; 472 473 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 474 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 475 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 476 int nfs4_discover_server_trunking(struct nfs_client *clp, 477 struct nfs_client **); 478 int nfs40_discover_server_trunking(struct nfs_client *clp, 479 struct nfs_client **, const struct cred *); 480 #if defined(CONFIG_NFS_V4_1) 481 int nfs41_discover_server_trunking(struct nfs_client *clp, 482 struct nfs_client **, const struct cred *); 483 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 484 extern void nfs41_notify_server(struct nfs_client *); 485 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 486 struct nfs41_server_owner *o2); 487 #else 488 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 489 { 490 } 491 #endif /* CONFIG_NFS_V4_1 */ 492 493 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 494 extern void nfs4_put_state_owner(struct nfs4_state_owner *); 495 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 496 extern void nfs4_free_state_owners(struct list_head *head); 497 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 498 extern void nfs4_put_open_state(struct nfs4_state *); 499 extern void nfs4_close_state(struct nfs4_state *, fmode_t); 500 extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 501 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 502 extern void nfs_inode_find_state_and_recover(struct inode *inode, 503 const nfs4_stateid *stateid); 504 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 505 extern void nfs4_schedule_lease_recovery(struct nfs_client *); 506 extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 507 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 508 extern void nfs4_schedule_state_manager(struct nfs_client *); 509 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 510 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 511 extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 512 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 513 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 514 extern void nfs41_handle_server_scope(struct nfs_client *, 515 struct nfs41_server_scope **); 516 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 517 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 518 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 519 const struct nfs_lock_context *, nfs4_stateid *, 520 const struct cred **); 521 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 522 struct nfs4_state *state); 523 524 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 525 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 526 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 527 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 528 extern void nfs_release_seqid(struct nfs_seqid *seqid); 529 extern void nfs_free_seqid(struct nfs_seqid *seqid); 530 extern int nfs4_setup_sequence(struct nfs_client *client, 531 struct nfs4_sequence_args *args, 532 struct nfs4_sequence_res *res, 533 struct rpc_task *task); 534 extern int nfs4_sequence_done(struct rpc_task *task, 535 struct nfs4_sequence_res *res); 536 537 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 538 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 539 extern const nfs4_stateid zero_stateid; 540 extern const nfs4_stateid invalid_stateid; 541 542 /* nfs4super.c */ 543 struct nfs_mount_info; 544 extern struct nfs_subversion nfs_v4; 545 extern bool nfs4_disable_idmapping; 546 extern unsigned short max_session_slots; 547 extern unsigned short max_session_cb_slots; 548 extern unsigned short send_implementation_id; 549 extern bool recover_lost_locks; 550 extern short nfs_delay_retrans; 551 552 #define NFS4_CLIENT_ID_UNIQ_LEN (64) 553 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 554 555 extern int nfs4_try_get_tree(struct fs_context *); 556 extern int nfs4_get_referral_tree(struct fs_context *); 557 558 /* nfs4sysctl.c */ 559 #ifdef CONFIG_SYSCTL 560 int nfs4_register_sysctl(void); 561 void nfs4_unregister_sysctl(void); 562 #else 563 static inline int nfs4_register_sysctl(void) 564 { 565 return 0; 566 } 567 568 static inline void nfs4_unregister_sysctl(void) 569 { 570 } 571 #endif 572 573 /* nfs4xdr.c */ 574 extern const struct rpc_procinfo nfs4_procedures[]; 575 576 #ifdef CONFIG_NFS_V4_2 577 extern const u32 nfs42_maxsetxattr_overhead; 578 extern const u32 nfs42_maxgetxattr_overhead; 579 extern const u32 nfs42_maxlistxattrs_overhead; 580 #endif 581 582 struct nfs4_mount_data; 583 584 /* callback_xdr.c */ 585 extern const struct svc_version nfs4_callback_version1; 586 extern const struct svc_version nfs4_callback_version4; 587 588 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 589 { 590 memcpy(dst->data, src->data, sizeof(dst->data)); 591 dst->type = src->type; 592 } 593 594 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 595 { 596 if (dst->type != src->type) 597 return false; 598 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 599 } 600 601 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 602 { 603 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 604 } 605 606 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 607 { 608 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 609 } 610 611 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 612 { 613 u32 seq1 = be32_to_cpu(s1->seqid); 614 u32 seq2 = be32_to_cpu(s2->seqid); 615 616 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 617 } 618 619 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 620 { 621 return nfs4_stateid_match_other(dst, src) && 622 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 623 } 624 625 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 626 { 627 u32 seqid = be32_to_cpu(s1->seqid); 628 629 if (++seqid == 0) 630 ++seqid; 631 s1->seqid = cpu_to_be32(seqid); 632 } 633 634 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 635 { 636 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 637 } 638 639 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 640 const nfs4_stateid *stateid) 641 { 642 return test_bit(NFS_OPEN_STATE, &state->flags) && 643 nfs4_stateid_match_other(&state->open_stateid, stateid); 644 } 645 646 /* nfs42xattr.c */ 647 #ifdef CONFIG_NFS_V4_2 648 extern int __init nfs4_xattr_cache_init(void); 649 extern void nfs4_xattr_cache_exit(void); 650 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 651 const char *buf, struct page **pages, 652 ssize_t buflen); 653 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 654 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 655 char *buf, ssize_t buflen); 656 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 657 ssize_t buflen); 658 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 659 ssize_t buflen); 660 extern void nfs4_xattr_cache_zap(struct inode *inode); 661 #else 662 static inline void nfs4_xattr_cache_zap(struct inode *inode) 663 { 664 } 665 #endif /* CONFIG_NFS_V4_2 */ 666 667 #else /* CONFIG_NFS_V4 */ 668 669 #define nfs4_close_state(a, b) do { } while (0) 670 #define nfs4_close_sync(a, b) do { } while (0) 671 #define nfs4_state_protect(a, b, c, d) do { } while (0) 672 #define nfs4_state_protect_write(a, b, c, d) do { } while (0) 673 674 675 #endif /* CONFIG_NFS_V4 */ 676 #endif /* __LINUX_FS_NFS_NFS4_FS.H */ 677