1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* internal AFS stuff 3 * 4 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #include <linux/compiler.h> 9 #include <linux/kernel.h> 10 #include <linux/ktime.h> 11 #include <linux/fs.h> 12 #include <linux/pagemap.h> 13 #include <linux/rxrpc.h> 14 #include <linux/key.h> 15 #include <linux/workqueue.h> 16 #include <linux/sched.h> 17 #include <linux/fscache.h> 18 #include <linux/backing-dev.h> 19 #include <linux/uuid.h> 20 #include <linux/mm_types.h> 21 #include <linux/dns_resolver.h> 22 #include <net/net_namespace.h> 23 #include <net/netns/generic.h> 24 #include <net/sock.h> 25 #include <net/af_rxrpc.h> 26 27 #include "afs.h" 28 #include "afs_vl.h" 29 30 #define AFS_CELL_MAX_ADDRS 15 31 32 struct pagevec; 33 struct afs_call; 34 35 /* 36 * Partial file-locking emulation mode. (The problem being that AFS3 only 37 * allows whole-file locks and no upgrading/downgrading). 38 */ 39 enum afs_flock_mode { 40 afs_flock_mode_unset, 41 afs_flock_mode_local, /* Local locking only */ 42 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */ 43 afs_flock_mode_strict, /* Always get a server lock for a partial lock */ 44 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */ 45 }; 46 47 struct afs_fs_context { 48 bool force; /* T to force cell type */ 49 bool autocell; /* T if set auto mount operation */ 50 bool dyn_root; /* T if dynamic root */ 51 bool no_cell; /* T if the source is "none" (for dynroot) */ 52 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */ 53 afs_voltype_t type; /* type of volume requested */ 54 unsigned int volnamesz; /* size of volume name */ 55 const char *volname; /* name of volume to mount */ 56 struct afs_net *net; /* the AFS net namespace stuff */ 57 struct afs_cell *cell; /* cell in which to find volume */ 58 struct afs_volume *volume; /* volume record */ 59 struct key *key; /* key to use for secure mounting */ 60 }; 61 62 struct afs_iget_data { 63 struct afs_fid fid; 64 struct afs_volume *volume; /* volume on which resides */ 65 unsigned int cb_v_break; /* Pre-fetch volume break count */ 66 unsigned int cb_s_break; /* Pre-fetch server break count */ 67 }; 68 69 enum afs_call_state { 70 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */ 71 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */ 72 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */ 73 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */ 74 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */ 75 AFS_CALL_SV_REPLYING, /* Server: Replying */ 76 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */ 77 AFS_CALL_COMPLETE, /* Completed or failed */ 78 }; 79 80 /* 81 * List of server addresses. 82 */ 83 struct afs_addr_list { 84 struct rcu_head rcu; /* Must be first */ 85 refcount_t usage; 86 u32 version; /* Version */ 87 unsigned char max_addrs; 88 unsigned char nr_addrs; 89 unsigned char preferred; /* Preferred address */ 90 unsigned char nr_ipv4; /* Number of IPv4 addresses */ 91 enum dns_record_source source:8; 92 enum dns_lookup_status status:8; 93 unsigned long probed; /* Mask of servers that have been probed */ 94 unsigned long failed; /* Mask of addrs that failed locally/ICMP */ 95 unsigned long responded; /* Mask of addrs that responded */ 96 struct sockaddr_rxrpc addrs[]; 97 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) 98 }; 99 100 /* 101 * a record of an in-progress RxRPC call 102 */ 103 struct afs_call { 104 const struct afs_call_type *type; /* type of call */ 105 struct afs_addr_list *alist; /* Address is alist[addr_ix] */ 106 wait_queue_head_t waitq; /* processes awaiting completion */ 107 struct work_struct async_work; /* async I/O processor */ 108 struct work_struct work; /* actual work processor */ 109 struct rxrpc_call *rxcall; /* RxRPC call handle */ 110 struct key *key; /* security for this call */ 111 struct afs_net *net; /* The network namespace */ 112 union { 113 struct afs_server *server; 114 struct afs_vlserver *vlserver; 115 }; 116 struct afs_cb_interest *cbi; /* Callback interest for server used */ 117 struct afs_vnode *lvnode; /* vnode being locked */ 118 void *request; /* request data (first part) */ 119 struct address_space *mapping; /* Pages being written from */ 120 struct iov_iter iter; /* Buffer iterator */ 121 struct iov_iter *_iter; /* Iterator currently in use */ 122 union { /* Convenience for ->iter */ 123 struct kvec kvec[1]; 124 struct bio_vec bvec[1]; 125 }; 126 void *buffer; /* reply receive buffer */ 127 union { 128 long ret0; /* Value to reply with instead of 0 */ 129 struct afs_addr_list *ret_alist; 130 struct afs_vldb_entry *ret_vldb; 131 struct afs_acl *ret_acl; 132 }; 133 struct afs_fid *out_fid; 134 struct afs_status_cb *out_dir_scb; 135 struct afs_status_cb *out_scb; 136 struct yfs_acl *out_yacl; 137 struct afs_volsync *out_volsync; 138 struct afs_volume_status *out_volstatus; 139 struct afs_read *read_request; 140 unsigned int server_index; 141 pgoff_t first; /* first page in mapping to deal with */ 142 pgoff_t last; /* last page in mapping to deal with */ 143 atomic_t usage; 144 enum afs_call_state state; 145 spinlock_t state_lock; 146 int error; /* error code */ 147 u32 abort_code; /* Remote abort ID or 0 */ 148 u32 epoch; 149 unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */ 150 unsigned request_size; /* size of request data */ 151 unsigned reply_max; /* maximum size of reply */ 152 unsigned first_offset; /* offset into mapping[first] */ 153 union { 154 unsigned last_to; /* amount of mapping[last] */ 155 unsigned count2; /* count used in unmarshalling */ 156 }; 157 unsigned char unmarshall; /* unmarshalling phase */ 158 unsigned char addr_ix; /* Address in ->alist */ 159 bool incoming; /* T if incoming call */ 160 bool send_pages; /* T if data from mapping should be sent */ 161 bool need_attention; /* T if RxRPC poked us */ 162 bool async; /* T if asynchronous */ 163 bool upgrade; /* T to request service upgrade */ 164 bool have_reply_time; /* T if have got reply_time */ 165 bool intr; /* T if interruptible */ 166 u16 service_id; /* Actual service ID (after upgrade) */ 167 unsigned int debug_id; /* Trace ID */ 168 u32 operation_ID; /* operation ID for an incoming call */ 169 u32 count; /* count for use in unmarshalling */ 170 union { /* place to extract temporary data */ 171 struct { 172 __be32 tmp_u; 173 __be32 tmp; 174 } __attribute__((packed)); 175 __be64 tmp64; 176 }; 177 ktime_t reply_time; /* Time of first reply packet */ 178 }; 179 180 struct afs_call_type { 181 const char *name; 182 unsigned int op; /* Really enum afs_fs_operation */ 183 184 /* deliver request or reply data to an call 185 * - returning an error will cause the call to be aborted 186 */ 187 int (*deliver)(struct afs_call *call); 188 189 /* clean up a call */ 190 void (*destructor)(struct afs_call *call); 191 192 /* Work function */ 193 void (*work)(struct work_struct *work); 194 195 /* Call done function (gets called immediately on success or failure) */ 196 void (*done)(struct afs_call *call); 197 }; 198 199 /* 200 * Key available for writeback on a file. 201 */ 202 struct afs_wb_key { 203 refcount_t usage; 204 struct key *key; 205 struct list_head vnode_link; /* Link in vnode->wb_keys */ 206 }; 207 208 /* 209 * AFS open file information record. Pointed to by file->private_data. 210 */ 211 struct afs_file { 212 struct key *key; /* The key this file was opened with */ 213 struct afs_wb_key *wb; /* Writeback key record for this file */ 214 }; 215 216 static inline struct key *afs_file_key(struct file *file) 217 { 218 struct afs_file *af = file->private_data; 219 220 return af->key; 221 } 222 223 /* 224 * Record of an outstanding read operation on a vnode. 225 */ 226 struct afs_read { 227 loff_t pos; /* Where to start reading */ 228 loff_t len; /* How much we're asking for */ 229 loff_t actual_len; /* How much we're actually getting */ 230 loff_t remain; /* Amount remaining */ 231 loff_t file_size; /* File size returned by server */ 232 afs_dataversion_t data_version; /* Version number returned by server */ 233 refcount_t usage; 234 unsigned int index; /* Which page we're reading into */ 235 unsigned int nr_pages; 236 unsigned int offset; /* offset into current page */ 237 struct afs_vnode *vnode; 238 void (*page_done)(struct afs_read *); 239 struct page **pages; 240 struct page *array[]; 241 }; 242 243 /* 244 * AFS superblock private data 245 * - there's one superblock per volume 246 */ 247 struct afs_super_info { 248 struct net *net_ns; /* Network namespace */ 249 struct afs_cell *cell; /* The cell in which the volume resides */ 250 struct afs_volume *volume; /* volume record */ 251 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 252 bool dyn_root; /* True if dynamic root */ 253 }; 254 255 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 256 { 257 return sb->s_fs_info; 258 } 259 260 extern struct file_system_type afs_fs_type; 261 262 /* 263 * Set of substitutes for @sys. 264 */ 265 struct afs_sysnames { 266 #define AFS_NR_SYSNAME 16 267 char *subs[AFS_NR_SYSNAME]; 268 refcount_t usage; 269 unsigned short nr; 270 char blank[1]; 271 }; 272 273 /* 274 * AFS network namespace record. 275 */ 276 struct afs_net { 277 struct net *net; /* Backpointer to the owning net namespace */ 278 struct afs_uuid uuid; 279 bool live; /* F if this namespace is being removed */ 280 281 /* AF_RXRPC I/O stuff */ 282 struct socket *socket; 283 struct afs_call *spare_incoming_call; 284 struct work_struct charge_preallocation_work; 285 struct mutex socket_mutex; 286 atomic_t nr_outstanding_calls; 287 atomic_t nr_superblocks; 288 289 /* Cell database */ 290 struct rb_root cells; 291 struct afs_cell __rcu *ws_cell; 292 struct work_struct cells_manager; 293 struct timer_list cells_timer; 294 atomic_t cells_outstanding; 295 seqlock_t cells_lock; 296 297 struct mutex proc_cells_lock; 298 struct hlist_head proc_cells; 299 300 /* Known servers. Theoretically each fileserver can only be in one 301 * cell, but in practice, people create aliases and subsets and there's 302 * no easy way to distinguish them. 303 */ 304 seqlock_t fs_lock; /* For fs_servers */ 305 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 306 struct list_head fs_updates; /* afs_server (by update_at) */ 307 struct hlist_head fs_proc; /* procfs servers list */ 308 309 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 310 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 311 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 312 313 struct work_struct fs_manager; 314 struct timer_list fs_timer; 315 atomic_t servers_outstanding; 316 317 /* File locking renewal management */ 318 struct mutex lock_manager_mutex; 319 320 /* Misc */ 321 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 322 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 323 struct afs_sysnames *sysnames; 324 rwlock_t sysnames_lock; 325 326 /* Statistics counters */ 327 atomic_t n_lookup; /* Number of lookups done */ 328 atomic_t n_reval; /* Number of dentries needing revalidation */ 329 atomic_t n_inval; /* Number of invalidations by the server */ 330 atomic_t n_relpg; /* Number of invalidations by releasepage */ 331 atomic_t n_read_dir; /* Number of directory pages read */ 332 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 333 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 334 atomic_t n_stores; /* Number of store ops */ 335 atomic_long_t n_store_bytes; /* Number of bytes stored */ 336 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 337 atomic_t n_fetches; /* Number of data fetch ops */ 338 }; 339 340 extern const char afs_init_sysname[]; 341 342 enum afs_cell_state { 343 AFS_CELL_UNSET, 344 AFS_CELL_ACTIVATING, 345 AFS_CELL_ACTIVE, 346 AFS_CELL_DEACTIVATING, 347 AFS_CELL_INACTIVE, 348 AFS_CELL_FAILED, 349 }; 350 351 /* 352 * AFS cell record. 353 * 354 * This is a tricky concept to get right as it is possible to create aliases 355 * simply by pointing AFSDB/SRV records for two names at the same set of VL 356 * servers; it is also possible to do things like setting up two sets of VL 357 * servers, one of which provides a superset of the volumes provided by the 358 * other (for internal/external division, for example). 359 * 360 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 361 * servers and (b) a cell's name is used by the client to select the key to use 362 * for authentication and encryption. The cell name is not typically used in 363 * the protocol. 364 * 365 * There is no easy way to determine if two cells are aliases or one is a 366 * subset of another. 367 */ 368 struct afs_cell { 369 union { 370 struct rcu_head rcu; 371 struct rb_node net_node; /* Node in net->cells */ 372 }; 373 struct afs_net *net; 374 struct key *anonymous_key; /* anonymous user key for this cell */ 375 struct work_struct manager; /* Manager for init/deinit/dns */ 376 struct hlist_node proc_link; /* /proc cell list link */ 377 #ifdef CONFIG_AFS_FSCACHE 378 struct fscache_cookie *cache; /* caching cookie */ 379 #endif 380 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 381 time64_t last_inactive; /* Time of last drop of usage count */ 382 atomic_t usage; 383 unsigned long flags; 384 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 385 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 386 enum afs_cell_state state; 387 short error; 388 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 389 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 390 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 391 392 /* Active fileserver interaction state. */ 393 struct list_head proc_volumes; /* procfs volume list */ 394 rwlock_t proc_lock; 395 396 /* VL server list. */ 397 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 398 struct afs_vlserver_list __rcu *vl_servers; 399 400 u8 name_len; /* Length of name */ 401 char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */ 402 }; 403 404 /* 405 * Volume Location server record. 406 */ 407 struct afs_vlserver { 408 struct rcu_head rcu; 409 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 410 unsigned long flags; 411 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 412 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 413 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 414 rwlock_t lock; /* Lock on addresses */ 415 atomic_t usage; 416 417 /* Probe state */ 418 wait_queue_head_t probe_wq; 419 atomic_t probe_outstanding; 420 spinlock_t probe_lock; 421 struct { 422 unsigned int rtt; /* RTT as ktime/64 */ 423 u32 abort_code; 424 short error; 425 bool have_result; 426 bool responded:1; 427 bool is_yfs:1; 428 bool not_yfs:1; 429 bool local_failure:1; 430 } probe; 431 432 u16 port; 433 u16 name_len; /* Length of name */ 434 char name[]; /* Server name, case-flattened */ 435 }; 436 437 /* 438 * Weighted list of Volume Location servers. 439 */ 440 struct afs_vlserver_entry { 441 u16 priority; /* Preference (as SRV) */ 442 u16 weight; /* Weight (as SRV) */ 443 enum dns_record_source source:8; 444 enum dns_lookup_status status:8; 445 struct afs_vlserver *server; 446 }; 447 448 struct afs_vlserver_list { 449 struct rcu_head rcu; 450 atomic_t usage; 451 u8 nr_servers; 452 u8 index; /* Server currently in use */ 453 u8 preferred; /* Preferred server */ 454 enum dns_record_source source:8; 455 enum dns_lookup_status status:8; 456 rwlock_t lock; 457 struct afs_vlserver_entry servers[]; 458 }; 459 460 /* 461 * Cached VLDB entry. 462 * 463 * This is pointed to by cell->vldb_entries, indexed by name. 464 */ 465 struct afs_vldb_entry { 466 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 467 468 unsigned long flags; 469 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 470 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 471 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 472 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 473 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 474 475 uuid_t fs_server[AFS_NMAXNSERVERS]; 476 u8 fs_mask[AFS_NMAXNSERVERS]; 477 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 478 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 479 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 480 short error; 481 u8 nr_servers; /* Number of server records */ 482 u8 name_len; 483 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 484 }; 485 486 /* 487 * Record of fileserver with which we're actively communicating. 488 */ 489 struct afs_server { 490 struct rcu_head rcu; 491 union { 492 uuid_t uuid; /* Server ID */ 493 struct afs_uuid _uuid; 494 }; 495 496 struct afs_addr_list __rcu *addresses; 497 struct rb_node uuid_rb; /* Link in net->servers */ 498 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 499 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 500 struct hlist_node proc_link; /* Link in net->fs_proc */ 501 struct afs_server *gc_next; /* Next server in manager's list */ 502 time64_t put_time; /* Time at which last put */ 503 time64_t update_at; /* Time at which to next update the record */ 504 unsigned long flags; 505 #define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */ 506 #define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */ 507 #define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */ 508 #define AFS_SERVER_FL_UPDATING 4 509 #define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */ 510 #define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */ 511 #define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */ 512 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 513 #define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */ 514 #define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */ 515 #define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */ 516 atomic_t usage; 517 u32 addr_version; /* Address list version */ 518 u32 cm_epoch; /* Server RxRPC epoch */ 519 520 /* file service access */ 521 rwlock_t fs_lock; /* access lock */ 522 523 /* callback promise management */ 524 struct hlist_head cb_volumes; /* List of volume interests on this server */ 525 unsigned cb_s_break; /* Break-everything counter. */ 526 rwlock_t cb_break_lock; /* Volume finding lock */ 527 528 /* Probe state */ 529 wait_queue_head_t probe_wq; 530 atomic_t probe_outstanding; 531 spinlock_t probe_lock; 532 struct { 533 unsigned int rtt; /* RTT as ktime/64 */ 534 u32 abort_code; 535 u32 cm_epoch; 536 short error; 537 bool have_result; 538 bool responded:1; 539 bool is_yfs:1; 540 bool not_yfs:1; 541 bool local_failure:1; 542 bool no_epoch:1; 543 bool cm_probed:1; 544 bool said_rebooted:1; 545 bool said_inconsistent:1; 546 } probe; 547 }; 548 549 /* 550 * Volume collation in the server's callback interest list. 551 */ 552 struct afs_vol_interest { 553 struct hlist_node srv_link; /* Link in server->cb_volumes */ 554 struct hlist_head cb_interests; /* List of callback interests on the server */ 555 union { 556 struct rcu_head rcu; 557 afs_volid_t vid; /* Volume ID to match */ 558 }; 559 unsigned int usage; 560 }; 561 562 /* 563 * Interest by a superblock on a server. 564 */ 565 struct afs_cb_interest { 566 struct hlist_node cb_vlink; /* Link in vol_interest->cb_interests */ 567 struct afs_vol_interest *vol_interest; 568 struct afs_server *server; /* Server on which this interest resides */ 569 struct super_block *sb; /* Superblock on which inodes reside */ 570 union { 571 struct rcu_head rcu; 572 afs_volid_t vid; /* Volume ID to match */ 573 }; 574 refcount_t usage; 575 }; 576 577 /* 578 * Replaceable server list. 579 */ 580 struct afs_server_entry { 581 struct afs_server *server; 582 struct afs_cb_interest *cb_interest; 583 }; 584 585 struct afs_server_list { 586 refcount_t usage; 587 unsigned char nr_servers; 588 unsigned char preferred; /* Preferred server */ 589 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 590 unsigned int seq; /* Set to ->servers_seq when installed */ 591 rwlock_t lock; 592 struct afs_server_entry servers[]; 593 }; 594 595 /* 596 * Live AFS volume management. 597 */ 598 struct afs_volume { 599 afs_volid_t vid; /* volume ID */ 600 atomic_t usage; 601 time64_t update_at; /* Time at which to next update */ 602 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 603 struct list_head proc_link; /* Link in cell->vl_proc */ 604 unsigned long flags; 605 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 606 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 607 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 608 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 609 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 610 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 611 #ifdef CONFIG_AFS_FSCACHE 612 struct fscache_cookie *cache; /* caching cookie */ 613 #endif 614 struct afs_server_list *servers; /* List of servers on which volume resides */ 615 rwlock_t servers_lock; /* Lock for ->servers */ 616 unsigned int servers_seq; /* Incremented each time ->servers changes */ 617 618 unsigned cb_v_break; /* Break-everything counter. */ 619 rwlock_t cb_break_lock; 620 621 afs_voltype_t type; /* type of volume */ 622 short error; 623 char type_force; /* force volume type (suppress R/O -> R/W) */ 624 u8 name_len; 625 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 626 }; 627 628 enum afs_lock_state { 629 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 630 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 631 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 632 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 633 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 634 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 635 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 636 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 637 }; 638 639 /* 640 * AFS inode private data. 641 * 642 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 643 * leak from one inode to another. 644 */ 645 struct afs_vnode { 646 struct inode vfs_inode; /* the VFS's inode record */ 647 648 struct afs_volume *volume; /* volume on which vnode resides */ 649 struct afs_fid fid; /* the file identifier for this inode */ 650 struct afs_file_status status; /* AFS status info for this file */ 651 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 652 #ifdef CONFIG_AFS_FSCACHE 653 struct fscache_cookie *cache; /* caching cookie */ 654 #endif 655 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 656 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 657 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 658 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 659 struct key *silly_key; /* Silly rename key */ 660 spinlock_t wb_lock; /* lock for wb_keys */ 661 spinlock_t lock; /* waitqueue/flags lock */ 662 unsigned long flags; 663 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 664 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 665 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 666 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 667 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 668 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 669 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 670 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 671 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 672 673 struct list_head wb_keys; /* List of keys available for writeback */ 674 struct list_head pending_locks; /* locks waiting to be granted */ 675 struct list_head granted_locks; /* locks granted on this file */ 676 struct delayed_work lock_work; /* work to be done in locking */ 677 struct key *lock_key; /* Key to be used in lock ops */ 678 ktime_t locked_at; /* Time at which lock obtained */ 679 enum afs_lock_state lock_state : 8; 680 afs_lock_type_t lock_type : 8; 681 682 /* outstanding callback notification on this file */ 683 struct afs_cb_interest __rcu *cb_interest; /* Server on which this resides */ 684 unsigned int cb_s_break; /* Mass break counter on ->server */ 685 unsigned int cb_v_break; /* Mass break counter on ->volume */ 686 unsigned int cb_break; /* Break counter on vnode */ 687 seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */ 688 689 time64_t cb_expires_at; /* time at which callback expires */ 690 }; 691 692 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 693 { 694 #ifdef CONFIG_AFS_FSCACHE 695 return vnode->cache; 696 #else 697 return NULL; 698 #endif 699 } 700 701 /* 702 * cached security record for one user's attempt to access a vnode 703 */ 704 struct afs_permit { 705 struct key *key; /* RxRPC ticket holding a security context */ 706 afs_access_t access; /* CallerAccess value for this key */ 707 }; 708 709 /* 710 * Immutable cache of CallerAccess records from attempts to access vnodes. 711 * These may be shared between multiple vnodes. 712 */ 713 struct afs_permits { 714 struct rcu_head rcu; 715 struct hlist_node hash_node; /* Link in hash */ 716 unsigned long h; /* Hash value for this permit list */ 717 refcount_t usage; 718 unsigned short nr_permits; /* Number of records */ 719 bool invalidated; /* Invalidated due to key change */ 720 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 721 }; 722 723 /* 724 * Error prioritisation and accumulation. 725 */ 726 struct afs_error { 727 short error; /* Accumulated error */ 728 bool responded; /* T if server responded */ 729 }; 730 731 /* 732 * Cursor for iterating over a server's address list. 733 */ 734 struct afs_addr_cursor { 735 struct afs_addr_list *alist; /* Current address list (pins ref) */ 736 unsigned long tried; /* Tried addresses */ 737 signed char index; /* Current address */ 738 bool responded; /* T if the current address responded */ 739 unsigned short nr_iterations; /* Number of address iterations */ 740 short error; 741 u32 abort_code; 742 }; 743 744 /* 745 * Cursor for iterating over a set of volume location servers. 746 */ 747 struct afs_vl_cursor { 748 struct afs_addr_cursor ac; 749 struct afs_cell *cell; /* The cell we're querying */ 750 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 751 struct afs_vlserver *server; /* Server on which this resides */ 752 struct key *key; /* Key for the server */ 753 unsigned long untried; /* Bitmask of untried servers */ 754 short index; /* Current server */ 755 short error; 756 unsigned short flags; 757 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 758 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 759 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 760 unsigned short nr_iterations; /* Number of server iterations */ 761 }; 762 763 /* 764 * Cursor for iterating over a set of fileservers. 765 */ 766 struct afs_fs_cursor { 767 const struct afs_call_type *type; /* Type of call done */ 768 struct afs_addr_cursor ac; 769 struct afs_vnode *vnode; 770 struct afs_server_list *server_list; /* Current server list (pins ref) */ 771 struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */ 772 struct key *key; /* Key for the server */ 773 unsigned long untried; /* Bitmask of untried servers */ 774 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 775 unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */ 776 short index; /* Current server */ 777 short error; 778 unsigned short flags; 779 #define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */ 780 #define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */ 781 #define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */ 782 #define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */ 783 #define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 784 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 785 #define AFS_FS_CURSOR_INTR 0x0040 /* Set if op is interruptible */ 786 unsigned short nr_iterations; /* Number of server iterations */ 787 }; 788 789 /* 790 * Cache auxiliary data. 791 */ 792 struct afs_vnode_cache_aux { 793 u64 data_version; 794 } __packed; 795 796 #include <trace/events/afs.h> 797 798 /*****************************************************************************/ 799 /* 800 * addr_list.c 801 */ 802 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 803 { 804 if (alist) 805 refcount_inc(&alist->usage); 806 return alist; 807 } 808 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 809 unsigned short, 810 unsigned short); 811 extern void afs_put_addrlist(struct afs_addr_list *); 812 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 813 const char *, size_t, char, 814 unsigned short, unsigned short); 815 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 816 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 817 extern int afs_end_cursor(struct afs_addr_cursor *); 818 819 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 820 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 821 822 /* 823 * cache.c 824 */ 825 #ifdef CONFIG_AFS_FSCACHE 826 extern struct fscache_netfs afs_cache_netfs; 827 extern struct fscache_cookie_def afs_cell_cache_index_def; 828 extern struct fscache_cookie_def afs_volume_cache_index_def; 829 extern struct fscache_cookie_def afs_vnode_cache_index_def; 830 #else 831 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 832 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 833 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 834 #endif 835 836 /* 837 * callback.c 838 */ 839 extern void afs_init_callback_state(struct afs_server *); 840 extern void __afs_break_callback(struct afs_vnode *); 841 extern void afs_break_callback(struct afs_vnode *); 842 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*); 843 844 extern int afs_register_server_cb_interest(struct afs_vnode *, 845 struct afs_server_list *, unsigned int); 846 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *); 847 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *); 848 849 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi) 850 { 851 if (cbi) 852 refcount_inc(&cbi->usage); 853 return cbi; 854 } 855 856 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 857 { 858 return vnode->cb_break + vnode->cb_v_break; 859 } 860 861 static inline bool afs_cb_is_broken(unsigned int cb_break, 862 const struct afs_vnode *vnode, 863 const struct afs_cb_interest *cbi) 864 { 865 return !cbi || cb_break != (vnode->cb_break + 866 vnode->volume->cb_v_break); 867 } 868 869 /* 870 * cell.c 871 */ 872 extern int afs_cell_init(struct afs_net *, const char *); 873 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 874 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 875 const char *, bool); 876 extern struct afs_cell *afs_get_cell(struct afs_cell *); 877 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 878 extern void afs_manage_cells(struct work_struct *); 879 extern void afs_cells_timer(struct timer_list *); 880 extern void __net_exit afs_cell_purge(struct afs_net *); 881 882 /* 883 * cmservice.c 884 */ 885 extern bool afs_cm_incoming_call(struct afs_call *); 886 887 /* 888 * dir.c 889 */ 890 extern const struct file_operations afs_dir_file_operations; 891 extern const struct inode_operations afs_dir_inode_operations; 892 extern const struct address_space_operations afs_dir_aops; 893 extern const struct dentry_operations afs_fs_dentry_operations; 894 895 extern void afs_d_release(struct dentry *); 896 897 /* 898 * dir_edit.c 899 */ 900 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 901 enum afs_edit_dir_reason); 902 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 903 904 /* 905 * dir_silly.c 906 */ 907 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 908 struct dentry *, struct key *); 909 extern int afs_silly_iput(struct dentry *, struct inode *); 910 911 /* 912 * dynroot.c 913 */ 914 extern const struct file_operations afs_dynroot_file_operations; 915 extern const struct inode_operations afs_dynroot_inode_operations; 916 extern const struct dentry_operations afs_dynroot_dentry_operations; 917 918 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 919 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 920 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 921 extern int afs_dynroot_populate(struct super_block *); 922 extern void afs_dynroot_depopulate(struct super_block *); 923 924 /* 925 * file.c 926 */ 927 extern const struct address_space_operations afs_fs_aops; 928 extern const struct inode_operations afs_file_inode_operations; 929 extern const struct file_operations afs_file_operations; 930 931 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 932 extern void afs_put_wb_key(struct afs_wb_key *); 933 extern int afs_open(struct inode *, struct file *); 934 extern int afs_release(struct inode *, struct file *); 935 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 936 extern int afs_page_filler(void *, struct page *); 937 extern void afs_put_read(struct afs_read *); 938 939 /* 940 * flock.c 941 */ 942 extern struct workqueue_struct *afs_lock_manager; 943 944 extern void afs_lock_op_done(struct afs_call *); 945 extern void afs_lock_work(struct work_struct *); 946 extern void afs_lock_may_be_available(struct afs_vnode *); 947 extern int afs_lock(struct file *, int, struct file_lock *); 948 extern int afs_flock(struct file *, int, struct file_lock *); 949 950 /* 951 * fsclient.c 952 */ 953 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *, 954 struct afs_volsync *); 955 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *); 956 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *); 957 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t, 958 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *); 959 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, 960 struct afs_status_cb *); 961 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, 962 struct afs_status_cb *, struct afs_status_cb *); 963 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, 964 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *); 965 extern int afs_fs_rename(struct afs_fs_cursor *, const char *, 966 struct afs_vnode *, const char *, 967 struct afs_status_cb *, struct afs_status_cb *); 968 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 969 pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *); 970 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *); 971 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 972 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *); 973 extern int afs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *); 974 extern int afs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *); 975 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 976 struct afs_addr_cursor *, struct key *); 977 extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 978 struct afs_addr_cursor *, struct key *, 979 unsigned int); 980 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 981 struct afs_fid *, struct afs_status_cb *, 982 unsigned int, struct afs_volsync *); 983 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 984 struct afs_fid *, struct afs_status_cb *, 985 struct afs_volsync *); 986 987 struct afs_acl { 988 u32 size; 989 u8 data[]; 990 }; 991 992 extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *, struct afs_status_cb *); 993 extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *, 994 struct afs_status_cb *); 995 996 /* 997 * fs_probe.c 998 */ 999 extern void afs_fileserver_probe_result(struct afs_call *); 1000 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *); 1001 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 1002 1003 /* 1004 * inode.c 1005 */ 1006 extern void afs_vnode_commit_status(struct afs_fs_cursor *, 1007 struct afs_vnode *, 1008 unsigned int, 1009 const afs_dataversion_t *, 1010 struct afs_status_cb *); 1011 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1012 extern int afs_iget5_test(struct inode *, void *); 1013 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1014 extern struct inode *afs_iget(struct super_block *, struct key *, 1015 struct afs_iget_data *, struct afs_status_cb *, 1016 struct afs_cb_interest *, 1017 struct afs_vnode *); 1018 extern void afs_zap_data(struct afs_vnode *); 1019 extern bool afs_check_validity(struct afs_vnode *); 1020 extern int afs_validate(struct afs_vnode *, struct key *); 1021 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1022 extern int afs_setattr(struct dentry *, struct iattr *); 1023 extern void afs_evict_inode(struct inode *); 1024 extern int afs_drop_inode(struct inode *); 1025 1026 /* 1027 * main.c 1028 */ 1029 extern struct workqueue_struct *afs_wq; 1030 extern int afs_net_id; 1031 1032 static inline struct afs_net *afs_net(struct net *net) 1033 { 1034 return net_generic(net, afs_net_id); 1035 } 1036 1037 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1038 { 1039 return afs_net(AFS_FS_S(sb)->net_ns); 1040 } 1041 1042 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1043 { 1044 return afs_sb2net(dentry->d_sb); 1045 } 1046 1047 static inline struct afs_net *afs_i2net(struct inode *inode) 1048 { 1049 return afs_sb2net(inode->i_sb); 1050 } 1051 1052 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1053 { 1054 return afs_i2net(&vnode->vfs_inode); 1055 } 1056 1057 static inline struct afs_net *afs_sock2net(struct sock *sk) 1058 { 1059 return net_generic(sock_net(sk), afs_net_id); 1060 } 1061 1062 static inline void __afs_stat(atomic_t *s) 1063 { 1064 atomic_inc(s); 1065 } 1066 1067 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1068 1069 /* 1070 * misc.c 1071 */ 1072 extern int afs_abort_to_error(u32); 1073 extern void afs_prioritise_error(struct afs_error *, int, u32); 1074 1075 /* 1076 * mntpt.c 1077 */ 1078 extern const struct inode_operations afs_mntpt_inode_operations; 1079 extern const struct inode_operations afs_autocell_inode_operations; 1080 extern const struct file_operations afs_mntpt_file_operations; 1081 1082 extern struct vfsmount *afs_d_automount(struct path *); 1083 extern void afs_mntpt_kill_timer(void); 1084 1085 /* 1086 * proc.c 1087 */ 1088 #ifdef CONFIG_PROC_FS 1089 extern int __net_init afs_proc_init(struct afs_net *); 1090 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1091 extern int afs_proc_cell_setup(struct afs_cell *); 1092 extern void afs_proc_cell_remove(struct afs_cell *); 1093 extern void afs_put_sysnames(struct afs_sysnames *); 1094 #else 1095 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1096 static inline void afs_proc_cleanup(struct afs_net *net) {} 1097 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1098 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1099 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1100 #endif 1101 1102 /* 1103 * rotate.c 1104 */ 1105 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *, 1106 struct key *, bool); 1107 extern bool afs_select_fileserver(struct afs_fs_cursor *); 1108 extern bool afs_select_current_fileserver(struct afs_fs_cursor *); 1109 extern int afs_end_vnode_operation(struct afs_fs_cursor *); 1110 1111 /* 1112 * rxrpc.c 1113 */ 1114 extern struct workqueue_struct *afs_async_calls; 1115 1116 extern int __net_init afs_open_socket(struct afs_net *); 1117 extern void __net_exit afs_close_socket(struct afs_net *); 1118 extern void afs_charge_preallocation(struct work_struct *); 1119 extern void afs_put_call(struct afs_call *); 1120 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1121 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1122 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1123 const struct afs_call_type *, 1124 size_t, size_t); 1125 extern void afs_flat_call_destructor(struct afs_call *); 1126 extern void afs_send_empty_reply(struct afs_call *); 1127 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1128 extern int afs_extract_data(struct afs_call *, bool); 1129 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause); 1130 1131 static inline void afs_set_fc_call(struct afs_call *call, struct afs_fs_cursor *fc) 1132 { 1133 call->intr = fc->flags & AFS_FS_CURSOR_INTR; 1134 fc->type = call->type; 1135 } 1136 1137 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1138 { 1139 call->kvec[0].iov_base = buf; 1140 call->kvec[0].iov_len = size; 1141 iov_iter_kvec(&call->iter, READ, call->kvec, 1, size); 1142 } 1143 1144 static inline void afs_extract_to_tmp(struct afs_call *call) 1145 { 1146 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1147 } 1148 1149 static inline void afs_extract_to_tmp64(struct afs_call *call) 1150 { 1151 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1152 } 1153 1154 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1155 { 1156 iov_iter_discard(&call->iter, READ, size); 1157 } 1158 1159 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1160 { 1161 afs_extract_begin(call, call->buffer, size); 1162 } 1163 1164 static inline int afs_transfer_reply(struct afs_call *call) 1165 { 1166 return afs_extract_data(call, false); 1167 } 1168 1169 static inline bool afs_check_call_state(struct afs_call *call, 1170 enum afs_call_state state) 1171 { 1172 return READ_ONCE(call->state) == state; 1173 } 1174 1175 static inline bool afs_set_call_state(struct afs_call *call, 1176 enum afs_call_state from, 1177 enum afs_call_state to) 1178 { 1179 bool ok = false; 1180 1181 spin_lock_bh(&call->state_lock); 1182 if (call->state == from) { 1183 call->state = to; 1184 trace_afs_call_state(call, from, to, 0, 0); 1185 ok = true; 1186 } 1187 spin_unlock_bh(&call->state_lock); 1188 return ok; 1189 } 1190 1191 static inline void afs_set_call_complete(struct afs_call *call, 1192 int error, u32 remote_abort) 1193 { 1194 enum afs_call_state state; 1195 bool ok = false; 1196 1197 spin_lock_bh(&call->state_lock); 1198 state = call->state; 1199 if (state != AFS_CALL_COMPLETE) { 1200 call->abort_code = remote_abort; 1201 call->error = error; 1202 call->state = AFS_CALL_COMPLETE; 1203 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1204 error, remote_abort); 1205 ok = true; 1206 } 1207 spin_unlock_bh(&call->state_lock); 1208 if (ok) 1209 trace_afs_call_done(call); 1210 } 1211 1212 /* 1213 * security.c 1214 */ 1215 extern void afs_put_permits(struct afs_permits *); 1216 extern void afs_clear_permits(struct afs_vnode *); 1217 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1218 struct afs_status_cb *); 1219 extern void afs_zap_permits(struct rcu_head *); 1220 extern struct key *afs_request_key(struct afs_cell *); 1221 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1222 extern int afs_permission(struct inode *, int); 1223 extern void __exit afs_clean_up_permit_cache(void); 1224 1225 /* 1226 * server.c 1227 */ 1228 extern spinlock_t afs_server_peer_lock; 1229 1230 static inline struct afs_server *afs_get_server(struct afs_server *server) 1231 { 1232 atomic_inc(&server->usage); 1233 return server; 1234 } 1235 1236 extern struct afs_server *afs_find_server(struct afs_net *, 1237 const struct sockaddr_rxrpc *); 1238 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1239 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *); 1240 extern void afs_put_server(struct afs_net *, struct afs_server *); 1241 extern void afs_manage_servers(struct work_struct *); 1242 extern void afs_servers_timer(struct timer_list *); 1243 extern void __net_exit afs_purge_servers(struct afs_net *); 1244 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *); 1245 1246 /* 1247 * server_list.c 1248 */ 1249 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1250 { 1251 refcount_inc(&slist->usage); 1252 return slist; 1253 } 1254 1255 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1256 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1257 struct afs_vldb_entry *, 1258 u8); 1259 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1260 1261 /* 1262 * super.c 1263 */ 1264 extern int __init afs_fs_init(void); 1265 extern void afs_fs_exit(void); 1266 1267 /* 1268 * vlclient.c 1269 */ 1270 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1271 const char *, int); 1272 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1273 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1274 struct key *, struct afs_vlserver *, unsigned int); 1275 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1276 1277 /* 1278 * vl_probe.c 1279 */ 1280 extern void afs_vlserver_probe_result(struct afs_call *); 1281 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1282 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1283 1284 /* 1285 * vl_rotate.c 1286 */ 1287 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1288 struct afs_cell *, struct key *); 1289 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1290 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1291 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1292 1293 /* 1294 * vlserver_list.c 1295 */ 1296 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1297 { 1298 atomic_inc(&vlserver->usage); 1299 return vlserver; 1300 } 1301 1302 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1303 { 1304 if (vllist) 1305 atomic_inc(&vllist->usage); 1306 return vllist; 1307 } 1308 1309 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1310 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1311 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1312 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1313 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1314 const void *, size_t); 1315 1316 /* 1317 * volume.c 1318 */ 1319 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume) 1320 { 1321 if (volume) 1322 atomic_inc(&volume->usage); 1323 return volume; 1324 } 1325 1326 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1327 extern void afs_activate_volume(struct afs_volume *); 1328 extern void afs_deactivate_volume(struct afs_volume *); 1329 extern void afs_put_volume(struct afs_cell *, struct afs_volume *); 1330 extern int afs_check_volume_status(struct afs_volume *, struct key *); 1331 1332 /* 1333 * write.c 1334 */ 1335 extern int afs_set_page_dirty(struct page *); 1336 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1337 loff_t pos, unsigned len, unsigned flags, 1338 struct page **pagep, void **fsdata); 1339 extern int afs_write_end(struct file *file, struct address_space *mapping, 1340 loff_t pos, unsigned len, unsigned copied, 1341 struct page *page, void *fsdata); 1342 extern int afs_writepage(struct page *, struct writeback_control *); 1343 extern int afs_writepages(struct address_space *, struct writeback_control *); 1344 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1345 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1346 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1347 extern void afs_prune_wb_keys(struct afs_vnode *); 1348 extern int afs_launder_page(struct page *); 1349 1350 /* 1351 * xattr.c 1352 */ 1353 extern const struct xattr_handler *afs_xattr_handlers[]; 1354 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1355 1356 /* 1357 * yfsclient.c 1358 */ 1359 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *, 1360 struct afs_volsync *); 1361 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *); 1362 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *, 1363 struct afs_fid *, struct afs_status_cb *); 1364 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *, 1365 struct afs_fid *, struct afs_status_cb *); 1366 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *, 1367 struct afs_status_cb *, struct afs_status_cb *); 1368 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, 1369 struct afs_status_cb *); 1370 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, 1371 struct afs_status_cb *, struct afs_status_cb *); 1372 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, 1373 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *); 1374 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, struct afs_vnode *, const char *, 1375 struct afs_status_cb *, struct afs_status_cb *); 1376 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 1377 pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *); 1378 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *); 1379 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 1380 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *); 1381 extern int yfs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *); 1382 extern int yfs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *); 1383 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 1384 struct afs_fid *, struct afs_status_cb *, 1385 struct afs_volsync *); 1386 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 1387 struct afs_fid *, struct afs_status_cb *, 1388 unsigned int, struct afs_volsync *); 1389 1390 struct yfs_acl { 1391 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1392 struct afs_acl *vol_acl; /* Whole volume ACL */ 1393 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1394 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1395 unsigned int flags; 1396 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1397 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1398 }; 1399 1400 extern void yfs_free_opaque_acl(struct yfs_acl *); 1401 extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, struct yfs_acl *, 1402 struct afs_status_cb *); 1403 extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *, 1404 struct afs_status_cb *); 1405 1406 /* 1407 * Miscellaneous inline functions. 1408 */ 1409 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1410 { 1411 return container_of(inode, struct afs_vnode, vfs_inode); 1412 } 1413 1414 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1415 { 1416 return &vnode->vfs_inode; 1417 } 1418 1419 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc, 1420 struct afs_vnode *vnode) 1421 { 1422 if (fc->ac.error == -ENOENT) { 1423 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1424 afs_break_callback(vnode); 1425 } 1426 } 1427 1428 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1429 { 1430 trace_afs_io_error(call->debug_id, -EIO, where); 1431 return -EIO; 1432 } 1433 1434 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1435 { 1436 trace_afs_file_error(vnode, -EIO, where); 1437 return -EIO; 1438 } 1439 1440 /*****************************************************************************/ 1441 /* 1442 * debug tracing 1443 */ 1444 extern unsigned afs_debug; 1445 1446 #define dbgprintk(FMT,...) \ 1447 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1448 1449 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1450 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1451 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1452 1453 1454 #if defined(__KDEBUG) 1455 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1456 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1457 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1458 1459 #elif defined(CONFIG_AFS_DEBUG) 1460 #define AFS_DEBUG_KENTER 0x01 1461 #define AFS_DEBUG_KLEAVE 0x02 1462 #define AFS_DEBUG_KDEBUG 0x04 1463 1464 #define _enter(FMT,...) \ 1465 do { \ 1466 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1467 kenter(FMT,##__VA_ARGS__); \ 1468 } while (0) 1469 1470 #define _leave(FMT,...) \ 1471 do { \ 1472 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1473 kleave(FMT,##__VA_ARGS__); \ 1474 } while (0) 1475 1476 #define _debug(FMT,...) \ 1477 do { \ 1478 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1479 kdebug(FMT,##__VA_ARGS__); \ 1480 } while (0) 1481 1482 #else 1483 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1484 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1485 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1486 #endif 1487 1488 /* 1489 * debug assertion checking 1490 */ 1491 #if 1 // defined(__KDEBUGALL) 1492 1493 #define ASSERT(X) \ 1494 do { \ 1495 if (unlikely(!(X))) { \ 1496 printk(KERN_ERR "\n"); \ 1497 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1498 BUG(); \ 1499 } \ 1500 } while(0) 1501 1502 #define ASSERTCMP(X, OP, Y) \ 1503 do { \ 1504 if (unlikely(!((X) OP (Y)))) { \ 1505 printk(KERN_ERR "\n"); \ 1506 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1507 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1508 (unsigned long)(X), (unsigned long)(Y)); \ 1509 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1510 (unsigned long)(X), (unsigned long)(Y)); \ 1511 BUG(); \ 1512 } \ 1513 } while(0) 1514 1515 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1516 do { \ 1517 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1518 printk(KERN_ERR "\n"); \ 1519 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1520 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1521 (unsigned long)(L), (unsigned long)(N), \ 1522 (unsigned long)(H)); \ 1523 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1524 (unsigned long)(L), (unsigned long)(N), \ 1525 (unsigned long)(H)); \ 1526 BUG(); \ 1527 } \ 1528 } while(0) 1529 1530 #define ASSERTIF(C, X) \ 1531 do { \ 1532 if (unlikely((C) && !(X))) { \ 1533 printk(KERN_ERR "\n"); \ 1534 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1535 BUG(); \ 1536 } \ 1537 } while(0) 1538 1539 #define ASSERTIFCMP(C, X, OP, Y) \ 1540 do { \ 1541 if (unlikely((C) && !((X) OP (Y)))) { \ 1542 printk(KERN_ERR "\n"); \ 1543 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1544 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1545 (unsigned long)(X), (unsigned long)(Y)); \ 1546 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1547 (unsigned long)(X), (unsigned long)(Y)); \ 1548 BUG(); \ 1549 } \ 1550 } while(0) 1551 1552 #else 1553 1554 #define ASSERT(X) \ 1555 do { \ 1556 } while(0) 1557 1558 #define ASSERTCMP(X, OP, Y) \ 1559 do { \ 1560 } while(0) 1561 1562 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1563 do { \ 1564 } while(0) 1565 1566 #define ASSERTIF(C, X) \ 1567 do { \ 1568 } while(0) 1569 1570 #define ASSERTIFCMP(C, X, OP, Y) \ 1571 do { \ 1572 } while(0) 1573 1574 #endif /* __KDEBUGALL */ 1575