1 /* 2 * Copyright (c) 2001 The Regents of the University of Michigan. 3 * All rights reserved. 4 * 5 * Kendrick Smith <kmsmith@umich.edu> 6 * Andy Adamson <andros@umich.edu> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35 #ifndef _NFSD4_STATE_H 36 #define _NFSD4_STATE_H 37 38 #include <linux/idr.h> 39 #include <linux/refcount.h> 40 #include <linux/sunrpc/svc_xprt.h> 41 #include "nfsfh.h" 42 #include "nfsd.h" 43 44 typedef struct { 45 u32 cl_boot; 46 u32 cl_id; 47 } clientid_t; 48 49 typedef struct { 50 clientid_t so_clid; 51 u32 so_id; 52 } stateid_opaque_t; 53 54 typedef struct { 55 u32 si_generation; 56 stateid_opaque_t si_opaque; 57 } stateid_t; 58 59 typedef struct { 60 stateid_t stid; 61 #define NFS4_COPY_STID 1 62 #define NFS4_COPYNOTIFY_STID 2 63 unsigned char sc_type; 64 refcount_t sc_count; 65 } copy_stateid_t; 66 67 struct nfsd4_callback { 68 struct nfs4_client *cb_clp; 69 struct rpc_message cb_msg; 70 const struct nfsd4_callback_ops *cb_ops; 71 struct work_struct cb_work; 72 int cb_seq_status; 73 int cb_status; 74 bool cb_need_restart; 75 bool cb_holds_slot; 76 }; 77 78 struct nfsd4_callback_ops { 79 void (*prepare)(struct nfsd4_callback *); 80 int (*done)(struct nfsd4_callback *, struct rpc_task *); 81 void (*release)(struct nfsd4_callback *); 82 }; 83 84 /* 85 * A core object that represents a "common" stateid. These are generally 86 * embedded within the different (more specific) stateid objects and contain 87 * fields that are of general use to any stateid. 88 */ 89 struct nfs4_stid { 90 refcount_t sc_count; 91 #define NFS4_OPEN_STID 1 92 #define NFS4_LOCK_STID 2 93 #define NFS4_DELEG_STID 4 94 /* For an open stateid kept around *only* to process close replays: */ 95 #define NFS4_CLOSED_STID 8 96 /* For a deleg stateid kept around only to process free_stateid's: */ 97 #define NFS4_REVOKED_DELEG_STID 16 98 #define NFS4_CLOSED_DELEG_STID 32 99 #define NFS4_LAYOUT_STID 64 100 struct list_head sc_cp_list; 101 unsigned char sc_type; 102 stateid_t sc_stateid; 103 spinlock_t sc_lock; 104 struct nfs4_client *sc_client; 105 struct nfs4_file *sc_file; 106 void (*sc_free)(struct nfs4_stid *); 107 }; 108 109 /* Keep a list of stateids issued by the COPY_NOTIFY, associate it with the 110 * parent OPEN/LOCK/DELEG stateid. 111 */ 112 struct nfs4_cpntf_state { 113 copy_stateid_t cp_stateid; 114 struct list_head cp_list; /* per parent nfs4_stid */ 115 stateid_t cp_p_stateid; /* copy of parent's stateid */ 116 clientid_t cp_p_clid; /* copy of parent's clid */ 117 time64_t cpntf_time; /* last time stateid used */ 118 }; 119 120 /* 121 * Represents a delegation stateid. The nfs4_client holds references to these 122 * and they are put when it is being destroyed or when the delegation is 123 * returned by the client: 124 * 125 * o 1 reference as long as a delegation is still in force (taken when it's 126 * alloc'd, put when it's returned or revoked) 127 * 128 * o 1 reference as long as a recall rpc is in progress (taken when the lease 129 * is broken, put when the rpc exits) 130 * 131 * o 1 more ephemeral reference for each nfsd thread currently doing something 132 * with that delegation without holding the cl_lock 133 * 134 * If the server attempts to recall a delegation and the client doesn't do so 135 * before a timeout, the server may also revoke the delegation. In that case, 136 * the object will either be destroyed (v4.0) or moved to a per-client list of 137 * revoked delegations (v4.1+). 138 * 139 * This object is a superset of the nfs4_stid. 140 */ 141 struct nfs4_delegation { 142 struct nfs4_stid dl_stid; /* must be first field */ 143 struct list_head dl_perfile; 144 struct list_head dl_perclnt; 145 struct list_head dl_recall_lru; /* delegation recalled */ 146 struct nfs4_clnt_odstate *dl_clnt_odstate; 147 u32 dl_type; 148 time64_t dl_time; 149 /* For recall: */ 150 int dl_retries; 151 struct nfsd4_callback dl_recall; 152 }; 153 154 #define cb_to_delegation(cb) \ 155 container_of(cb, struct nfs4_delegation, dl_recall) 156 157 /* client delegation callback info */ 158 struct nfs4_cb_conn { 159 /* SETCLIENTID info */ 160 struct sockaddr_storage cb_addr; 161 struct sockaddr_storage cb_saddr; 162 size_t cb_addrlen; 163 u32 cb_prog; /* used only in 4.0 case; 164 per-session otherwise */ 165 u32 cb_ident; /* minorversion 0 only */ 166 struct svc_xprt *cb_xprt; /* minorversion 1 only */ 167 }; 168 169 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s) 170 { 171 return container_of(s, struct nfs4_delegation, dl_stid); 172 } 173 174 /* Maximum number of slots per session. 160 is useful for long haul TCP */ 175 #define NFSD_MAX_SLOTS_PER_SESSION 160 176 /* Maximum number of operations per session compound */ 177 #define NFSD_MAX_OPS_PER_COMPOUND 16 178 /* Maximum session per slot cache size */ 179 #define NFSD_SLOT_CACHE_SIZE 2048 180 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */ 181 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32 182 #define NFSD_MAX_MEM_PER_SESSION \ 183 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE) 184 185 struct nfsd4_slot { 186 u32 sl_seqid; 187 __be32 sl_status; 188 struct svc_cred sl_cred; 189 u32 sl_datalen; 190 u16 sl_opcnt; 191 #define NFSD4_SLOT_INUSE (1 << 0) 192 #define NFSD4_SLOT_CACHETHIS (1 << 1) 193 #define NFSD4_SLOT_INITIALIZED (1 << 2) 194 #define NFSD4_SLOT_CACHED (1 << 3) 195 u8 sl_flags; 196 char sl_data[]; 197 }; 198 199 struct nfsd4_channel_attrs { 200 u32 headerpadsz; 201 u32 maxreq_sz; 202 u32 maxresp_sz; 203 u32 maxresp_cached; 204 u32 maxops; 205 u32 maxreqs; 206 u32 nr_rdma_attrs; 207 u32 rdma_attrs; 208 }; 209 210 struct nfsd4_cb_sec { 211 u32 flavor; /* (u32)(-1) used to mean "no valid flavor" */ 212 kuid_t uid; 213 kgid_t gid; 214 }; 215 216 struct nfsd4_create_session { 217 clientid_t clientid; 218 struct nfs4_sessionid sessionid; 219 u32 seqid; 220 u32 flags; 221 struct nfsd4_channel_attrs fore_channel; 222 struct nfsd4_channel_attrs back_channel; 223 u32 callback_prog; 224 struct nfsd4_cb_sec cb_sec; 225 }; 226 227 struct nfsd4_backchannel_ctl { 228 u32 bc_cb_program; 229 struct nfsd4_cb_sec bc_cb_sec; 230 }; 231 232 struct nfsd4_bind_conn_to_session { 233 struct nfs4_sessionid sessionid; 234 u32 dir; 235 }; 236 237 /* The single slot clientid cache structure */ 238 struct nfsd4_clid_slot { 239 u32 sl_seqid; 240 __be32 sl_status; 241 struct nfsd4_create_session sl_cr_ses; 242 }; 243 244 struct nfsd4_conn { 245 struct list_head cn_persession; 246 struct svc_xprt *cn_xprt; 247 struct svc_xpt_user cn_xpt_user; 248 struct nfsd4_session *cn_session; 249 /* CDFC4_FORE, CDFC4_BACK: */ 250 unsigned char cn_flags; 251 }; 252 253 /* 254 * Representation of a v4.1+ session. These are refcounted in a similar fashion 255 * to the nfs4_client. References are only taken when the server is actively 256 * working on the object (primarily during the processing of compounds). 257 */ 258 struct nfsd4_session { 259 atomic_t se_ref; 260 struct list_head se_hash; /* hash by sessionid */ 261 struct list_head se_perclnt; 262 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */ 263 #define NFS4_SESSION_DEAD 0x010 264 u32 se_flags; 265 struct nfs4_client *se_client; 266 struct nfs4_sessionid se_sessionid; 267 struct nfsd4_channel_attrs se_fchannel; 268 struct nfsd4_channel_attrs se_bchannel; 269 struct nfsd4_cb_sec se_cb_sec; 270 struct list_head se_conns; 271 u32 se_cb_prog; 272 u32 se_cb_seq_nr; 273 struct nfsd4_slot *se_slots[]; /* forward channel slots */ 274 }; 275 276 /* formatted contents of nfs4_sessionid */ 277 struct nfsd4_sessionid { 278 clientid_t clientid; 279 u32 sequence; 280 u32 reserved; 281 }; 282 283 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */ 284 285 /* 286 * struct nfs4_client - one per client. Clientids live here. 287 * 288 * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0) 289 * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped. 290 * Each nfsd_net_ns object contains a set of these and they are tracked via 291 * short and long form clientid. They are hashed and searched for under the 292 * per-nfsd_net client_lock spinlock. 293 * 294 * References to it are only held during the processing of compounds, and in 295 * certain other operations. In their "resting state" they have a refcount of 296 * 0. If they are not renewed within a lease period, they become eligible for 297 * destruction by the laundromat. 298 * 299 * These objects can also be destroyed prematurely by the fault injection code, 300 * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates. 301 * Care is taken *not* to do this however when the objects have an elevated 302 * refcount. 303 * 304 * o Each nfs4_client is hashed by clientid 305 * 306 * o Each nfs4_clients is also hashed by name (the opaque quantity initially 307 * sent by the client to identify itself). 308 * 309 * o cl_perclient list is used to ensure no dangling stateowner references 310 * when we expire the nfs4_client 311 */ 312 struct nfs4_client { 313 struct list_head cl_idhash; /* hash by cl_clientid.id */ 314 struct rb_node cl_namenode; /* link into by-name trees */ 315 struct list_head *cl_ownerstr_hashtbl; 316 struct list_head cl_openowners; 317 struct idr cl_stateids; /* stateid lookup */ 318 struct list_head cl_delegations; 319 struct list_head cl_revoked; /* unacknowledged, revoked 4.1 state */ 320 struct list_head cl_lru; /* tail queue */ 321 #ifdef CONFIG_NFSD_PNFS 322 struct list_head cl_lo_states; /* outstanding layout states */ 323 #endif 324 struct xdr_netobj cl_name; /* id generated by client */ 325 nfs4_verifier cl_verifier; /* generated by client */ 326 time64_t cl_time; /* time of last lease renewal */ 327 struct sockaddr_storage cl_addr; /* client ipaddress */ 328 bool cl_mach_cred; /* SP4_MACH_CRED in force */ 329 struct svc_cred cl_cred; /* setclientid principal */ 330 clientid_t cl_clientid; /* generated by server */ 331 nfs4_verifier cl_confirm; /* generated by server */ 332 u32 cl_minorversion; 333 /* NFSv4.1 client implementation id: */ 334 struct xdr_netobj cl_nii_domain; 335 struct xdr_netobj cl_nii_name; 336 struct timespec64 cl_nii_time; 337 338 /* for v4.0 and v4.1 callbacks: */ 339 struct nfs4_cb_conn cl_cb_conn; 340 #define NFSD4_CLIENT_CB_UPDATE (0) 341 #define NFSD4_CLIENT_CB_KILL (1) 342 #define NFSD4_CLIENT_STABLE (2) /* client on stable storage */ 343 #define NFSD4_CLIENT_RECLAIM_COMPLETE (3) /* reclaim_complete done */ 344 #define NFSD4_CLIENT_CONFIRMED (4) /* client is confirmed */ 345 #define NFSD4_CLIENT_UPCALL_LOCK (5) /* upcall serialization */ 346 #define NFSD4_CLIENT_CB_FLAG_MASK (1 << NFSD4_CLIENT_CB_UPDATE | \ 347 1 << NFSD4_CLIENT_CB_KILL) 348 unsigned long cl_flags; 349 const struct cred *cl_cb_cred; 350 struct rpc_clnt *cl_cb_client; 351 u32 cl_cb_ident; 352 #define NFSD4_CB_UP 0 353 #define NFSD4_CB_UNKNOWN 1 354 #define NFSD4_CB_DOWN 2 355 #define NFSD4_CB_FAULT 3 356 int cl_cb_state; 357 struct nfsd4_callback cl_cb_null; 358 struct nfsd4_session *cl_cb_session; 359 360 /* for all client information that callback code might need: */ 361 spinlock_t cl_lock; 362 363 /* for nfs41 */ 364 struct list_head cl_sessions; 365 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */ 366 u32 cl_exchange_flags; 367 /* number of rpc's in progress over an associated session: */ 368 atomic_t cl_rpc_users; 369 struct nfsdfs_client cl_nfsdfs; 370 struct nfs4_op_map cl_spo_must_allow; 371 372 /* debugging info directory under nfsd/clients/ : */ 373 struct dentry *cl_nfsd_dentry; 374 375 /* for nfs41 callbacks */ 376 /* We currently support a single back channel with a single slot */ 377 unsigned long cl_cb_slot_busy; 378 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */ 379 /* wait here for slots */ 380 struct net *net; 381 struct list_head async_copies; /* list of async copies */ 382 spinlock_t async_lock; /* lock for async copies */ 383 atomic_t cl_cb_inflight; /* Outstanding callbacks */ 384 }; 385 386 /* struct nfs4_client_reset 387 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl 388 * upon lease reset, or from upcall to state_daemon (to read in state 389 * from non-volitile storage) upon reboot. 390 */ 391 struct nfs4_client_reclaim { 392 struct list_head cr_strhash; /* hash by cr_name */ 393 struct nfs4_client *cr_clp; /* pointer to associated clp */ 394 struct xdr_netobj cr_name; /* recovery dir name */ 395 struct xdr_netobj cr_princhash; 396 }; 397 398 /* A reasonable value for REPLAY_ISIZE was estimated as follows: 399 * The OPEN response, typically the largest, requires 400 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) + 401 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) + 402 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes 403 */ 404 405 #define NFSD4_REPLAY_ISIZE 112 406 407 /* 408 * Replay buffer, where the result of the last seqid-mutating operation 409 * is cached. 410 */ 411 struct nfs4_replay { 412 __be32 rp_status; 413 unsigned int rp_buflen; 414 char *rp_buf; 415 struct knfsd_fh rp_openfh; 416 struct mutex rp_mutex; 417 char rp_ibuf[NFSD4_REPLAY_ISIZE]; 418 }; 419 420 struct nfs4_stateowner; 421 422 struct nfs4_stateowner_operations { 423 void (*so_unhash)(struct nfs4_stateowner *); 424 void (*so_free)(struct nfs4_stateowner *); 425 }; 426 427 /* 428 * A core object that represents either an open or lock owner. The object and 429 * lock owner objects have one of these embedded within them. Refcounts and 430 * other fields common to both owner types are contained within these 431 * structures. 432 */ 433 struct nfs4_stateowner { 434 struct list_head so_strhash; 435 struct list_head so_stateids; 436 struct nfs4_client *so_client; 437 const struct nfs4_stateowner_operations *so_ops; 438 /* after increment in nfsd4_bump_seqid, represents the next 439 * sequence id expected from the client: */ 440 atomic_t so_count; 441 u32 so_seqid; 442 struct xdr_netobj so_owner; /* open owner name */ 443 struct nfs4_replay so_replay; 444 bool so_is_open_owner; 445 }; 446 447 /* 448 * When a file is opened, the client provides an open state owner opaque string 449 * that indicates the "owner" of that open. These objects are refcounted. 450 * References to it are held by each open state associated with it. This object 451 * is a superset of the nfs4_stateowner struct. 452 */ 453 struct nfs4_openowner { 454 struct nfs4_stateowner oo_owner; /* must be first field */ 455 struct list_head oo_perclient; 456 /* 457 * We keep around openowners a little while after last close, 458 * which saves clients from having to confirm, and allows us to 459 * handle close replays if they come soon enough. The close_lru 460 * is a list of such openowners, to be reaped by the laundromat 461 * thread eventually if they remain unused: 462 */ 463 struct list_head oo_close_lru; 464 struct nfs4_ol_stateid *oo_last_closed_stid; 465 time64_t oo_time; /* time of placement on so_close_lru */ 466 #define NFS4_OO_CONFIRMED 1 467 unsigned char oo_flags; 468 }; 469 470 /* 471 * Represents a generic "lockowner". Similar to an openowner. References to it 472 * are held by the lock stateids that are created on its behalf. This object is 473 * a superset of the nfs4_stateowner struct. 474 */ 475 struct nfs4_lockowner { 476 struct nfs4_stateowner lo_owner; /* must be first element */ 477 struct list_head lo_blocked; /* blocked file_locks */ 478 }; 479 480 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so) 481 { 482 return container_of(so, struct nfs4_openowner, oo_owner); 483 } 484 485 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so) 486 { 487 return container_of(so, struct nfs4_lockowner, lo_owner); 488 } 489 490 /* 491 * Per-client state indicating no. of opens and outstanding delegations 492 * on a file from a particular client.'od' stands for 'open & delegation' 493 */ 494 struct nfs4_clnt_odstate { 495 struct nfs4_client *co_client; 496 struct nfs4_file *co_file; 497 struct list_head co_perfile; 498 refcount_t co_odcount; 499 }; 500 501 /* 502 * nfs4_file: a file opened by some number of (open) nfs4_stateowners. 503 * 504 * These objects are global. nfsd keeps one instance of a nfs4_file per 505 * filehandle (though it may keep multiple file descriptors for each). Each 506 * inode can have multiple filehandles associated with it, so there is 507 * (potentially) a many to one relationship between this struct and struct 508 * inode. 509 * 510 * These are hashed by filehandle in the file_hashtbl, which is protected by 511 * the global state_lock spinlock. 512 */ 513 struct nfs4_file { 514 refcount_t fi_ref; 515 spinlock_t fi_lock; 516 struct hlist_node fi_hash; /* hash on fi_fhandle */ 517 struct list_head fi_stateids; 518 union { 519 struct list_head fi_delegations; 520 struct rcu_head fi_rcu; 521 }; 522 struct list_head fi_clnt_odstate; 523 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */ 524 struct nfsd_file *fi_fds[3]; 525 /* 526 * Each open or lock stateid contributes 0-4 to the counts 527 * below depending on which bits are set in st_access_bitmap: 528 * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set 529 * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set 530 * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set. 531 */ 532 atomic_t fi_access[2]; 533 u32 fi_share_deny; 534 struct nfsd_file *fi_deleg_file; 535 int fi_delegees; 536 struct knfsd_fh fi_fhandle; 537 bool fi_had_conflict; 538 #ifdef CONFIG_NFSD_PNFS 539 struct list_head fi_lo_states; 540 atomic_t fi_lo_recalls; 541 #endif 542 }; 543 544 /* 545 * A generic struct representing either a open or lock stateid. The nfs4_client 546 * holds a reference to each of these objects, and they in turn hold a 547 * reference to their respective stateowners. The client's reference is 548 * released in response to a close or unlock (depending on whether it's an open 549 * or lock stateid) or when the client is being destroyed. 550 * 551 * In the case of v4.0 open stateids, these objects are preserved for a little 552 * while after close in order to handle CLOSE replays. Those are eventually 553 * reclaimed via a LRU scheme by the laundromat. 554 * 555 * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock". 556 * Better suggestions welcome. 557 */ 558 struct nfs4_ol_stateid { 559 struct nfs4_stid st_stid; 560 struct list_head st_perfile; 561 struct list_head st_perstateowner; 562 struct list_head st_locks; 563 struct nfs4_stateowner *st_stateowner; 564 struct nfs4_clnt_odstate *st_clnt_odstate; 565 unsigned char st_access_bmap; 566 unsigned char st_deny_bmap; 567 struct nfs4_ol_stateid *st_openstp; 568 struct mutex st_mutex; 569 }; 570 571 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s) 572 { 573 return container_of(s, struct nfs4_ol_stateid, st_stid); 574 } 575 576 struct nfs4_layout_stateid { 577 struct nfs4_stid ls_stid; 578 struct list_head ls_perclnt; 579 struct list_head ls_perfile; 580 spinlock_t ls_lock; 581 struct list_head ls_layouts; 582 u32 ls_layout_type; 583 struct nfsd_file *ls_file; 584 struct nfsd4_callback ls_recall; 585 stateid_t ls_recall_sid; 586 bool ls_recalled; 587 struct mutex ls_mutex; 588 }; 589 590 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s) 591 { 592 return container_of(s, struct nfs4_layout_stateid, ls_stid); 593 } 594 595 /* flags for preprocess_seqid_op() */ 596 #define RD_STATE 0x00000010 597 #define WR_STATE 0x00000020 598 599 enum nfsd4_cb_op { 600 NFSPROC4_CLNT_CB_NULL = 0, 601 NFSPROC4_CLNT_CB_RECALL, 602 NFSPROC4_CLNT_CB_LAYOUT, 603 NFSPROC4_CLNT_CB_OFFLOAD, 604 NFSPROC4_CLNT_CB_SEQUENCE, 605 NFSPROC4_CLNT_CB_NOTIFY_LOCK, 606 }; 607 608 /* Returns true iff a is later than b: */ 609 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b) 610 { 611 return (s32)(a->si_generation - b->si_generation) > 0; 612 } 613 614 /* 615 * When a client tries to get a lock on a file, we set one of these objects 616 * on the blocking lock. When the lock becomes free, we can then issue a 617 * CB_NOTIFY_LOCK to the server. 618 */ 619 struct nfsd4_blocked_lock { 620 struct list_head nbl_list; 621 struct list_head nbl_lru; 622 time64_t nbl_time; 623 struct file_lock nbl_lock; 624 struct knfsd_fh nbl_fh; 625 struct nfsd4_callback nbl_cb; 626 }; 627 628 struct nfsd4_compound_state; 629 struct nfsd_net; 630 struct nfsd4_copy; 631 632 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp, 633 struct nfsd4_compound_state *cstate, struct svc_fh *fhp, 634 stateid_t *stateid, int flags, struct nfsd_file **filp, 635 struct nfs4_stid **cstid); 636 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, 637 stateid_t *stateid, unsigned char typemask, 638 struct nfs4_stid **s, struct nfsd_net *nn); 639 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab, 640 void (*sc_free)(struct nfs4_stid *)); 641 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy); 642 void nfs4_free_copy_state(struct nfsd4_copy *copy); 643 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn, 644 struct nfs4_stid *p_stid); 645 void nfs4_unhash_stid(struct nfs4_stid *s); 646 void nfs4_put_stid(struct nfs4_stid *s); 647 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid); 648 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *); 649 extern void nfs4_release_reclaim(struct nfsd_net *); 650 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name, 651 struct nfsd_net *nn); 652 extern __be32 nfs4_check_open_reclaim(clientid_t *clid, 653 struct nfsd4_compound_state *cstate, struct nfsd_net *nn); 654 extern void nfsd4_probe_callback(struct nfs4_client *clp); 655 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp); 656 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *); 657 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, 658 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op); 659 extern void nfsd4_run_cb(struct nfsd4_callback *cb); 660 extern int nfsd4_create_callback_queue(void); 661 extern void nfsd4_destroy_callback_queue(void); 662 extern void nfsd4_shutdown_callback(struct nfs4_client *); 663 extern void nfsd4_shutdown_copy(struct nfs4_client *clp); 664 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp); 665 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name, 666 struct xdr_netobj princhash, struct nfsd_net *nn); 667 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn); 668 669 struct nfs4_file *find_file(struct knfsd_fh *fh); 670 void put_nfs4_file(struct nfs4_file *fi); 671 extern void nfs4_put_copy(struct nfsd4_copy *copy); 672 extern struct nfsd4_copy * 673 find_async_copy(struct nfs4_client *clp, stateid_t *staetid); 674 extern void nfs4_put_cpntf_state(struct nfsd_net *nn, 675 struct nfs4_cpntf_state *cps); 676 extern __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st, 677 struct nfs4_client *clp, 678 struct nfs4_cpntf_state **cps); 679 static inline void get_nfs4_file(struct nfs4_file *fi) 680 { 681 refcount_inc(&fi->fi_ref); 682 } 683 struct nfsd_file *find_any_file(struct nfs4_file *f); 684 685 /* grace period management */ 686 void nfsd4_end_grace(struct nfsd_net *nn); 687 688 /* nfs4recover operations */ 689 extern int nfsd4_client_tracking_init(struct net *net); 690 extern void nfsd4_client_tracking_exit(struct net *net); 691 extern void nfsd4_client_record_create(struct nfs4_client *clp); 692 extern void nfsd4_client_record_remove(struct nfs4_client *clp); 693 extern int nfsd4_client_record_check(struct nfs4_client *clp); 694 extern void nfsd4_record_grace_done(struct nfsd_net *nn); 695 696 #endif /* NFSD4_STATE_H */ 697