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 #define STATEID_FMT "(%08x/%08x/%08x/%08x)" 60 #define STATEID_VAL(s) \ 61 (s)->si_opaque.so_clid.cl_boot, \ 62 (s)->si_opaque.so_clid.cl_id, \ 63 (s)->si_opaque.so_id, \ 64 (s)->si_generation 65 66 struct nfsd4_callback { 67 struct nfs4_client *cb_clp; 68 struct rpc_message cb_msg; 69 const struct nfsd4_callback_ops *cb_ops; 70 struct work_struct cb_work; 71 int cb_seq_status; 72 int cb_status; 73 bool cb_need_restart; 74 bool cb_holds_slot; 75 }; 76 77 struct nfsd4_callback_ops { 78 void (*prepare)(struct nfsd4_callback *); 79 int (*done)(struct nfsd4_callback *, struct rpc_task *); 80 void (*release)(struct nfsd4_callback *); 81 }; 82 83 /* 84 * A core object that represents a "common" stateid. These are generally 85 * embedded within the different (more specific) stateid objects and contain 86 * fields that are of general use to any stateid. 87 */ 88 struct nfs4_stid { 89 refcount_t sc_count; 90 #define NFS4_OPEN_STID 1 91 #define NFS4_LOCK_STID 2 92 #define NFS4_DELEG_STID 4 93 /* For an open stateid kept around *only* to process close replays: */ 94 #define NFS4_CLOSED_STID 8 95 /* For a deleg stateid kept around only to process free_stateid's: */ 96 #define NFS4_REVOKED_DELEG_STID 16 97 #define NFS4_CLOSED_DELEG_STID 32 98 #define NFS4_LAYOUT_STID 64 99 unsigned char sc_type; 100 stateid_t sc_stateid; 101 spinlock_t sc_lock; 102 struct nfs4_client *sc_client; 103 struct nfs4_file *sc_file; 104 void (*sc_free)(struct nfs4_stid *); 105 }; 106 107 /* 108 * Represents a delegation stateid. The nfs4_client holds references to these 109 * and they are put when it is being destroyed or when the delegation is 110 * returned by the client: 111 * 112 * o 1 reference as long as a delegation is still in force (taken when it's 113 * alloc'd, put when it's returned or revoked) 114 * 115 * o 1 reference as long as a recall rpc is in progress (taken when the lease 116 * is broken, put when the rpc exits) 117 * 118 * o 1 more ephemeral reference for each nfsd thread currently doing something 119 * with that delegation without holding the cl_lock 120 * 121 * If the server attempts to recall a delegation and the client doesn't do so 122 * before a timeout, the server may also revoke the delegation. In that case, 123 * the object will either be destroyed (v4.0) or moved to a per-client list of 124 * revoked delegations (v4.1+). 125 * 126 * This object is a superset of the nfs4_stid. 127 */ 128 struct nfs4_delegation { 129 struct nfs4_stid dl_stid; /* must be first field */ 130 struct list_head dl_perfile; 131 struct list_head dl_perclnt; 132 struct list_head dl_recall_lru; /* delegation recalled */ 133 struct nfs4_clnt_odstate *dl_clnt_odstate; 134 u32 dl_type; 135 time_t dl_time; 136 /* For recall: */ 137 int dl_retries; 138 struct nfsd4_callback dl_recall; 139 }; 140 141 #define cb_to_delegation(cb) \ 142 container_of(cb, struct nfs4_delegation, dl_recall) 143 144 /* client delegation callback info */ 145 struct nfs4_cb_conn { 146 /* SETCLIENTID info */ 147 struct sockaddr_storage cb_addr; 148 struct sockaddr_storage cb_saddr; 149 size_t cb_addrlen; 150 u32 cb_prog; /* used only in 4.0 case; 151 per-session otherwise */ 152 u32 cb_ident; /* minorversion 0 only */ 153 struct svc_xprt *cb_xprt; /* minorversion 1 only */ 154 }; 155 156 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s) 157 { 158 return container_of(s, struct nfs4_delegation, dl_stid); 159 } 160 161 /* Maximum number of slots per session. 160 is useful for long haul TCP */ 162 #define NFSD_MAX_SLOTS_PER_SESSION 160 163 /* Maximum number of operations per session compound */ 164 #define NFSD_MAX_OPS_PER_COMPOUND 16 165 /* Maximum session per slot cache size */ 166 #define NFSD_SLOT_CACHE_SIZE 2048 167 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */ 168 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32 169 #define NFSD_MAX_MEM_PER_SESSION \ 170 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE) 171 172 struct nfsd4_slot { 173 u32 sl_seqid; 174 __be32 sl_status; 175 struct svc_cred sl_cred; 176 u32 sl_datalen; 177 u16 sl_opcnt; 178 #define NFSD4_SLOT_INUSE (1 << 0) 179 #define NFSD4_SLOT_CACHETHIS (1 << 1) 180 #define NFSD4_SLOT_INITIALIZED (1 << 2) 181 #define NFSD4_SLOT_CACHED (1 << 3) 182 u8 sl_flags; 183 char sl_data[]; 184 }; 185 186 struct nfsd4_channel_attrs { 187 u32 headerpadsz; 188 u32 maxreq_sz; 189 u32 maxresp_sz; 190 u32 maxresp_cached; 191 u32 maxops; 192 u32 maxreqs; 193 u32 nr_rdma_attrs; 194 u32 rdma_attrs; 195 }; 196 197 struct nfsd4_cb_sec { 198 u32 flavor; /* (u32)(-1) used to mean "no valid flavor" */ 199 kuid_t uid; 200 kgid_t gid; 201 }; 202 203 struct nfsd4_create_session { 204 clientid_t clientid; 205 struct nfs4_sessionid sessionid; 206 u32 seqid; 207 u32 flags; 208 struct nfsd4_channel_attrs fore_channel; 209 struct nfsd4_channel_attrs back_channel; 210 u32 callback_prog; 211 struct nfsd4_cb_sec cb_sec; 212 }; 213 214 struct nfsd4_backchannel_ctl { 215 u32 bc_cb_program; 216 struct nfsd4_cb_sec bc_cb_sec; 217 }; 218 219 struct nfsd4_bind_conn_to_session { 220 struct nfs4_sessionid sessionid; 221 u32 dir; 222 }; 223 224 /* The single slot clientid cache structure */ 225 struct nfsd4_clid_slot { 226 u32 sl_seqid; 227 __be32 sl_status; 228 struct nfsd4_create_session sl_cr_ses; 229 }; 230 231 struct nfsd4_conn { 232 struct list_head cn_persession; 233 struct svc_xprt *cn_xprt; 234 struct svc_xpt_user cn_xpt_user; 235 struct nfsd4_session *cn_session; 236 /* CDFC4_FORE, CDFC4_BACK: */ 237 unsigned char cn_flags; 238 }; 239 240 /* 241 * Representation of a v4.1+ session. These are refcounted in a similar fashion 242 * to the nfs4_client. References are only taken when the server is actively 243 * working on the object (primarily during the processing of compounds). 244 */ 245 struct nfsd4_session { 246 atomic_t se_ref; 247 struct list_head se_hash; /* hash by sessionid */ 248 struct list_head se_perclnt; 249 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */ 250 #define NFS4_SESSION_DEAD 0x010 251 u32 se_flags; 252 struct nfs4_client *se_client; 253 struct nfs4_sessionid se_sessionid; 254 struct nfsd4_channel_attrs se_fchannel; 255 struct nfsd4_channel_attrs se_bchannel; 256 struct nfsd4_cb_sec se_cb_sec; 257 struct list_head se_conns; 258 u32 se_cb_prog; 259 u32 se_cb_seq_nr; 260 struct nfsd4_slot *se_slots[]; /* forward channel slots */ 261 }; 262 263 /* formatted contents of nfs4_sessionid */ 264 struct nfsd4_sessionid { 265 clientid_t clientid; 266 u32 sequence; 267 u32 reserved; 268 }; 269 270 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */ 271 272 /* 273 * struct nfs4_client - one per client. Clientids live here. 274 * 275 * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0) 276 * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped. 277 * Each nfsd_net_ns object contains a set of these and they are tracked via 278 * short and long form clientid. They are hashed and searched for under the 279 * per-nfsd_net client_lock spinlock. 280 * 281 * References to it are only held during the processing of compounds, and in 282 * certain other operations. In their "resting state" they have a refcount of 283 * 0. If they are not renewed within a lease period, they become eligible for 284 * destruction by the laundromat. 285 * 286 * These objects can also be destroyed prematurely by the fault injection code, 287 * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates. 288 * Care is taken *not* to do this however when the objects have an elevated 289 * refcount. 290 * 291 * o Each nfs4_client is hashed by clientid 292 * 293 * o Each nfs4_clients is also hashed by name (the opaque quantity initially 294 * sent by the client to identify itself). 295 * 296 * o cl_perclient list is used to ensure no dangling stateowner references 297 * when we expire the nfs4_client 298 */ 299 struct nfs4_client { 300 struct list_head cl_idhash; /* hash by cl_clientid.id */ 301 struct rb_node cl_namenode; /* link into by-name trees */ 302 struct list_head *cl_ownerstr_hashtbl; 303 struct list_head cl_openowners; 304 struct idr cl_stateids; /* stateid lookup */ 305 struct list_head cl_delegations; 306 struct list_head cl_revoked; /* unacknowledged, revoked 4.1 state */ 307 struct list_head cl_lru; /* tail queue */ 308 #ifdef CONFIG_NFSD_PNFS 309 struct list_head cl_lo_states; /* outstanding layout states */ 310 #endif 311 struct xdr_netobj cl_name; /* id generated by client */ 312 nfs4_verifier cl_verifier; /* generated by client */ 313 time_t cl_time; /* time of last lease renewal */ 314 struct sockaddr_storage cl_addr; /* client ipaddress */ 315 bool cl_mach_cred; /* SP4_MACH_CRED in force */ 316 struct svc_cred cl_cred; /* setclientid principal */ 317 clientid_t cl_clientid; /* generated by server */ 318 nfs4_verifier cl_confirm; /* generated by server */ 319 u32 cl_minorversion; 320 /* NFSv4.1 client implementation id: */ 321 struct xdr_netobj cl_nii_domain; 322 struct xdr_netobj cl_nii_name; 323 struct timespec cl_nii_time; 324 325 /* for v4.0 and v4.1 callbacks: */ 326 struct nfs4_cb_conn cl_cb_conn; 327 #define NFSD4_CLIENT_CB_UPDATE (0) 328 #define NFSD4_CLIENT_CB_KILL (1) 329 #define NFSD4_CLIENT_STABLE (2) /* client on stable storage */ 330 #define NFSD4_CLIENT_RECLAIM_COMPLETE (3) /* reclaim_complete done */ 331 #define NFSD4_CLIENT_CONFIRMED (4) /* client is confirmed */ 332 #define NFSD4_CLIENT_UPCALL_LOCK (5) /* upcall serialization */ 333 #define NFSD4_CLIENT_CB_FLAG_MASK (1 << NFSD4_CLIENT_CB_UPDATE | \ 334 1 << NFSD4_CLIENT_CB_KILL) 335 unsigned long cl_flags; 336 const struct cred *cl_cb_cred; 337 struct rpc_clnt *cl_cb_client; 338 u32 cl_cb_ident; 339 #define NFSD4_CB_UP 0 340 #define NFSD4_CB_UNKNOWN 1 341 #define NFSD4_CB_DOWN 2 342 #define NFSD4_CB_FAULT 3 343 int cl_cb_state; 344 struct nfsd4_callback cl_cb_null; 345 struct nfsd4_session *cl_cb_session; 346 347 /* for all client information that callback code might need: */ 348 spinlock_t cl_lock; 349 350 /* for nfs41 */ 351 struct list_head cl_sessions; 352 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */ 353 u32 cl_exchange_flags; 354 /* number of rpc's in progress over an associated session: */ 355 atomic_t cl_rpc_users; 356 struct nfsdfs_client cl_nfsdfs; 357 struct nfs4_op_map cl_spo_must_allow; 358 359 /* debugging info directory under nfsd/clients/ : */ 360 struct dentry *cl_nfsd_dentry; 361 362 /* for nfs41 callbacks */ 363 /* We currently support a single back channel with a single slot */ 364 unsigned long cl_cb_slot_busy; 365 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */ 366 /* wait here for slots */ 367 struct net *net; 368 struct list_head async_copies; /* list of async copies */ 369 spinlock_t async_lock; /* lock for async copies */ 370 }; 371 372 /* struct nfs4_client_reset 373 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl 374 * upon lease reset, or from upcall to state_daemon (to read in state 375 * from non-volitile storage) upon reboot. 376 */ 377 struct nfs4_client_reclaim { 378 struct list_head cr_strhash; /* hash by cr_name */ 379 struct nfs4_client *cr_clp; /* pointer to associated clp */ 380 struct xdr_netobj cr_name; /* recovery dir name */ 381 struct xdr_netobj cr_princhash; 382 }; 383 384 /* A reasonable value for REPLAY_ISIZE was estimated as follows: 385 * The OPEN response, typically the largest, requires 386 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) + 387 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) + 388 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes 389 */ 390 391 #define NFSD4_REPLAY_ISIZE 112 392 393 /* 394 * Replay buffer, where the result of the last seqid-mutating operation 395 * is cached. 396 */ 397 struct nfs4_replay { 398 __be32 rp_status; 399 unsigned int rp_buflen; 400 char *rp_buf; 401 struct knfsd_fh rp_openfh; 402 struct mutex rp_mutex; 403 char rp_ibuf[NFSD4_REPLAY_ISIZE]; 404 }; 405 406 struct nfs4_stateowner; 407 408 struct nfs4_stateowner_operations { 409 void (*so_unhash)(struct nfs4_stateowner *); 410 void (*so_free)(struct nfs4_stateowner *); 411 }; 412 413 /* 414 * A core object that represents either an open or lock owner. The object and 415 * lock owner objects have one of these embedded within them. Refcounts and 416 * other fields common to both owner types are contained within these 417 * structures. 418 */ 419 struct nfs4_stateowner { 420 struct list_head so_strhash; 421 struct list_head so_stateids; 422 struct nfs4_client *so_client; 423 const struct nfs4_stateowner_operations *so_ops; 424 /* after increment in nfsd4_bump_seqid, represents the next 425 * sequence id expected from the client: */ 426 atomic_t so_count; 427 u32 so_seqid; 428 struct xdr_netobj so_owner; /* open owner name */ 429 struct nfs4_replay so_replay; 430 bool so_is_open_owner; 431 }; 432 433 /* 434 * When a file is opened, the client provides an open state owner opaque string 435 * that indicates the "owner" of that open. These objects are refcounted. 436 * References to it are held by each open state associated with it. This object 437 * is a superset of the nfs4_stateowner struct. 438 */ 439 struct nfs4_openowner { 440 struct nfs4_stateowner oo_owner; /* must be first field */ 441 struct list_head oo_perclient; 442 /* 443 * We keep around openowners a little while after last close, 444 * which saves clients from having to confirm, and allows us to 445 * handle close replays if they come soon enough. The close_lru 446 * is a list of such openowners, to be reaped by the laundromat 447 * thread eventually if they remain unused: 448 */ 449 struct list_head oo_close_lru; 450 struct nfs4_ol_stateid *oo_last_closed_stid; 451 time_t oo_time; /* time of placement on so_close_lru */ 452 #define NFS4_OO_CONFIRMED 1 453 unsigned char oo_flags; 454 }; 455 456 /* 457 * Represents a generic "lockowner". Similar to an openowner. References to it 458 * are held by the lock stateids that are created on its behalf. This object is 459 * a superset of the nfs4_stateowner struct. 460 */ 461 struct nfs4_lockowner { 462 struct nfs4_stateowner lo_owner; /* must be first element */ 463 struct list_head lo_blocked; /* blocked file_locks */ 464 }; 465 466 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so) 467 { 468 return container_of(so, struct nfs4_openowner, oo_owner); 469 } 470 471 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so) 472 { 473 return container_of(so, struct nfs4_lockowner, lo_owner); 474 } 475 476 /* 477 * Per-client state indicating no. of opens and outstanding delegations 478 * on a file from a particular client.'od' stands for 'open & delegation' 479 */ 480 struct nfs4_clnt_odstate { 481 struct nfs4_client *co_client; 482 struct nfs4_file *co_file; 483 struct list_head co_perfile; 484 refcount_t co_odcount; 485 }; 486 487 /* 488 * nfs4_file: a file opened by some number of (open) nfs4_stateowners. 489 * 490 * These objects are global. nfsd keeps one instance of a nfs4_file per 491 * filehandle (though it may keep multiple file descriptors for each). Each 492 * inode can have multiple filehandles associated with it, so there is 493 * (potentially) a many to one relationship between this struct and struct 494 * inode. 495 * 496 * These are hashed by filehandle in the file_hashtbl, which is protected by 497 * the global state_lock spinlock. 498 */ 499 struct nfs4_file { 500 refcount_t fi_ref; 501 spinlock_t fi_lock; 502 struct hlist_node fi_hash; /* hash on fi_fhandle */ 503 struct list_head fi_stateids; 504 union { 505 struct list_head fi_delegations; 506 struct rcu_head fi_rcu; 507 }; 508 struct list_head fi_clnt_odstate; 509 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */ 510 struct nfsd_file *fi_fds[3]; 511 /* 512 * Each open or lock stateid contributes 0-4 to the counts 513 * below depending on which bits are set in st_access_bitmap: 514 * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set 515 * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set 516 * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set. 517 */ 518 atomic_t fi_access[2]; 519 u32 fi_share_deny; 520 struct nfsd_file *fi_deleg_file; 521 int fi_delegees; 522 struct knfsd_fh fi_fhandle; 523 bool fi_had_conflict; 524 #ifdef CONFIG_NFSD_PNFS 525 struct list_head fi_lo_states; 526 atomic_t fi_lo_recalls; 527 #endif 528 }; 529 530 /* 531 * A generic struct representing either a open or lock stateid. The nfs4_client 532 * holds a reference to each of these objects, and they in turn hold a 533 * reference to their respective stateowners. The client's reference is 534 * released in response to a close or unlock (depending on whether it's an open 535 * or lock stateid) or when the client is being destroyed. 536 * 537 * In the case of v4.0 open stateids, these objects are preserved for a little 538 * while after close in order to handle CLOSE replays. Those are eventually 539 * reclaimed via a LRU scheme by the laundromat. 540 * 541 * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock". 542 * Better suggestions welcome. 543 */ 544 struct nfs4_ol_stateid { 545 struct nfs4_stid st_stid; 546 struct list_head st_perfile; 547 struct list_head st_perstateowner; 548 struct list_head st_locks; 549 struct nfs4_stateowner *st_stateowner; 550 struct nfs4_clnt_odstate *st_clnt_odstate; 551 unsigned char st_access_bmap; 552 unsigned char st_deny_bmap; 553 struct nfs4_ol_stateid *st_openstp; 554 struct mutex st_mutex; 555 }; 556 557 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s) 558 { 559 return container_of(s, struct nfs4_ol_stateid, st_stid); 560 } 561 562 struct nfs4_layout_stateid { 563 struct nfs4_stid ls_stid; 564 struct list_head ls_perclnt; 565 struct list_head ls_perfile; 566 spinlock_t ls_lock; 567 struct list_head ls_layouts; 568 u32 ls_layout_type; 569 struct nfsd_file *ls_file; 570 struct nfsd4_callback ls_recall; 571 stateid_t ls_recall_sid; 572 bool ls_recalled; 573 struct mutex ls_mutex; 574 }; 575 576 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s) 577 { 578 return container_of(s, struct nfs4_layout_stateid, ls_stid); 579 } 580 581 /* flags for preprocess_seqid_op() */ 582 #define RD_STATE 0x00000010 583 #define WR_STATE 0x00000020 584 585 enum nfsd4_cb_op { 586 NFSPROC4_CLNT_CB_NULL = 0, 587 NFSPROC4_CLNT_CB_RECALL, 588 NFSPROC4_CLNT_CB_LAYOUT, 589 NFSPROC4_CLNT_CB_OFFLOAD, 590 NFSPROC4_CLNT_CB_SEQUENCE, 591 NFSPROC4_CLNT_CB_NOTIFY_LOCK, 592 }; 593 594 /* Returns true iff a is later than b: */ 595 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b) 596 { 597 return (s32)(a->si_generation - b->si_generation) > 0; 598 } 599 600 /* 601 * When a client tries to get a lock on a file, we set one of these objects 602 * on the blocking lock. When the lock becomes free, we can then issue a 603 * CB_NOTIFY_LOCK to the server. 604 */ 605 struct nfsd4_blocked_lock { 606 struct list_head nbl_list; 607 struct list_head nbl_lru; 608 unsigned long nbl_time; 609 struct file_lock nbl_lock; 610 struct knfsd_fh nbl_fh; 611 struct nfsd4_callback nbl_cb; 612 }; 613 614 struct nfsd4_compound_state; 615 struct nfsd_net; 616 struct nfsd4_copy; 617 618 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp, 619 struct nfsd4_compound_state *cstate, struct svc_fh *fhp, 620 stateid_t *stateid, int flags, struct nfsd_file **filp); 621 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, 622 stateid_t *stateid, unsigned char typemask, 623 struct nfs4_stid **s, struct nfsd_net *nn); 624 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab, 625 void (*sc_free)(struct nfs4_stid *)); 626 int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy); 627 void nfs4_free_cp_state(struct nfsd4_copy *copy); 628 void nfs4_unhash_stid(struct nfs4_stid *s); 629 void nfs4_put_stid(struct nfs4_stid *s); 630 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid); 631 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *); 632 extern void nfs4_release_reclaim(struct nfsd_net *); 633 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name, 634 struct nfsd_net *nn); 635 extern __be32 nfs4_check_open_reclaim(clientid_t *clid, 636 struct nfsd4_compound_state *cstate, struct nfsd_net *nn); 637 extern void nfsd4_probe_callback(struct nfs4_client *clp); 638 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp); 639 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *); 640 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, 641 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op); 642 extern void nfsd4_run_cb(struct nfsd4_callback *cb); 643 extern int nfsd4_create_callback_queue(void); 644 extern void nfsd4_destroy_callback_queue(void); 645 extern void nfsd4_shutdown_callback(struct nfs4_client *); 646 extern void nfsd4_shutdown_copy(struct nfs4_client *clp); 647 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp); 648 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name, 649 struct xdr_netobj princhash, struct nfsd_net *nn); 650 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn); 651 652 struct nfs4_file *find_file(struct knfsd_fh *fh); 653 void put_nfs4_file(struct nfs4_file *fi); 654 extern void nfs4_put_copy(struct nfsd4_copy *copy); 655 extern struct nfsd4_copy * 656 find_async_copy(struct nfs4_client *clp, stateid_t *staetid); 657 static inline void get_nfs4_file(struct nfs4_file *fi) 658 { 659 refcount_inc(&fi->fi_ref); 660 } 661 struct nfsd_file *find_any_file(struct nfs4_file *f); 662 663 /* grace period management */ 664 void nfsd4_end_grace(struct nfsd_net *nn); 665 666 /* nfs4recover operations */ 667 extern int nfsd4_client_tracking_init(struct net *net); 668 extern void nfsd4_client_tracking_exit(struct net *net); 669 extern void nfsd4_client_record_create(struct nfs4_client *clp); 670 extern void nfsd4_client_record_remove(struct nfs4_client *clp); 671 extern int nfsd4_client_record_check(struct nfs4_client *clp); 672 extern void nfsd4_record_grace_done(struct nfsd_net *nn); 673 674 /* nfs fault injection functions */ 675 #ifdef CONFIG_NFSD_FAULT_INJECTION 676 void nfsd_fault_inject_init(void); 677 void nfsd_fault_inject_cleanup(void); 678 679 u64 nfsd_inject_print_clients(void); 680 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t); 681 u64 nfsd_inject_forget_clients(u64); 682 683 u64 nfsd_inject_print_locks(void); 684 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t); 685 u64 nfsd_inject_forget_locks(u64); 686 687 u64 nfsd_inject_print_openowners(void); 688 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t); 689 u64 nfsd_inject_forget_openowners(u64); 690 691 u64 nfsd_inject_print_delegations(void); 692 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t); 693 u64 nfsd_inject_forget_delegations(u64); 694 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t); 695 u64 nfsd_inject_recall_delegations(u64); 696 #else /* CONFIG_NFSD_FAULT_INJECTION */ 697 static inline void nfsd_fault_inject_init(void) {} 698 static inline void nfsd_fault_inject_cleanup(void) {} 699 #endif /* CONFIG_NFSD_FAULT_INJECTION */ 700 701 #endif /* NFSD4_STATE_H */ 702