1 /* internal AFS stuff 2 * 3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/compiler.h> 13 #include <linux/kernel.h> 14 #include <linux/ktime.h> 15 #include <linux/fs.h> 16 #include <linux/pagemap.h> 17 #include <linux/rxrpc.h> 18 #include <linux/key.h> 19 #include <linux/workqueue.h> 20 #include <linux/sched.h> 21 #include <linux/fscache.h> 22 #include <linux/backing-dev.h> 23 #include <linux/uuid.h> 24 #include <linux/mm_types.h> 25 #include <linux/dns_resolver.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/sock.h> 29 #include <net/af_rxrpc.h> 30 31 #include "afs.h" 32 #include "afs_vl.h" 33 34 #define AFS_CELL_MAX_ADDRS 15 35 36 struct pagevec; 37 struct afs_call; 38 39 struct afs_fs_context { 40 bool force; /* T to force cell type */ 41 bool autocell; /* T if set auto mount operation */ 42 bool dyn_root; /* T if dynamic root */ 43 bool no_cell; /* T if the source is "none" (for dynroot) */ 44 afs_voltype_t type; /* type of volume requested */ 45 unsigned int volnamesz; /* size of volume name */ 46 const char *volname; /* name of volume to mount */ 47 struct afs_net *net; /* the AFS net namespace stuff */ 48 struct afs_cell *cell; /* cell in which to find volume */ 49 struct afs_volume *volume; /* volume record */ 50 struct key *key; /* key to use for secure mounting */ 51 }; 52 53 struct afs_iget_data { 54 struct afs_fid fid; 55 struct afs_volume *volume; /* volume on which resides */ 56 }; 57 58 enum afs_call_state { 59 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */ 60 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */ 61 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */ 62 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */ 63 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */ 64 AFS_CALL_SV_REPLYING, /* Server: Replying */ 65 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */ 66 AFS_CALL_COMPLETE, /* Completed or failed */ 67 }; 68 69 /* 70 * List of server addresses. 71 */ 72 struct afs_addr_list { 73 struct rcu_head rcu; /* Must be first */ 74 refcount_t usage; 75 u32 version; /* Version */ 76 unsigned char max_addrs; 77 unsigned char nr_addrs; 78 unsigned char preferred; /* Preferred address */ 79 unsigned char nr_ipv4; /* Number of IPv4 addresses */ 80 enum dns_record_source source:8; 81 enum dns_lookup_status status:8; 82 unsigned long probed; /* Mask of servers that have been probed */ 83 unsigned long failed; /* Mask of addrs that failed locally/ICMP */ 84 unsigned long responded; /* Mask of addrs that responded */ 85 struct sockaddr_rxrpc addrs[]; 86 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) 87 }; 88 89 /* 90 * a record of an in-progress RxRPC call 91 */ 92 struct afs_call { 93 const struct afs_call_type *type; /* type of call */ 94 struct afs_addr_list *alist; /* Address is alist[addr_ix] */ 95 wait_queue_head_t waitq; /* processes awaiting completion */ 96 struct work_struct async_work; /* async I/O processor */ 97 struct work_struct work; /* actual work processor */ 98 struct rxrpc_call *rxcall; /* RxRPC call handle */ 99 struct key *key; /* security for this call */ 100 struct afs_net *net; /* The network namespace */ 101 struct afs_server *cm_server; /* Server affected by incoming CM call */ 102 struct afs_cb_interest *cbi; /* Callback interest for server used */ 103 void *request; /* request data (first part) */ 104 struct address_space *mapping; /* Pages being written from */ 105 struct iov_iter iter; /* Buffer iterator */ 106 struct iov_iter *_iter; /* Iterator currently in use */ 107 union { /* Convenience for ->iter */ 108 struct kvec kvec[1]; 109 struct bio_vec bvec[1]; 110 }; 111 void *buffer; /* reply receive buffer */ 112 void *reply[4]; /* Where to put the reply */ 113 pgoff_t first; /* first page in mapping to deal with */ 114 pgoff_t last; /* last page in mapping to deal with */ 115 atomic_t usage; 116 enum afs_call_state state; 117 spinlock_t state_lock; 118 int error; /* error code */ 119 u32 abort_code; /* Remote abort ID or 0 */ 120 u32 epoch; 121 unsigned request_size; /* size of request data */ 122 unsigned reply_max; /* maximum size of reply */ 123 unsigned first_offset; /* offset into mapping[first] */ 124 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 125 union { 126 unsigned last_to; /* amount of mapping[last] */ 127 unsigned count2; /* count used in unmarshalling */ 128 }; 129 unsigned char unmarshall; /* unmarshalling phase */ 130 unsigned char addr_ix; /* Address in ->alist */ 131 bool incoming; /* T if incoming call */ 132 bool send_pages; /* T if data from mapping should be sent */ 133 bool need_attention; /* T if RxRPC poked us */ 134 bool async; /* T if asynchronous */ 135 bool ret_reply0; /* T if should return reply[0] on success */ 136 bool upgrade; /* T to request service upgrade */ 137 bool want_reply_time; /* T if want reply_time */ 138 u16 service_id; /* Actual service ID (after upgrade) */ 139 unsigned int debug_id; /* Trace ID */ 140 u32 operation_ID; /* operation ID for an incoming call */ 141 u32 count; /* count for use in unmarshalling */ 142 union { /* place to extract temporary data */ 143 struct { 144 __be32 tmp_u; 145 __be32 tmp; 146 } __attribute__((packed)); 147 __be64 tmp64; 148 }; 149 afs_dataversion_t expected_version; /* Updated version expected from store */ 150 afs_dataversion_t expected_version_2; /* 2nd updated version expected from store */ 151 ktime_t reply_time; /* Time of first reply packet */ 152 }; 153 154 struct afs_call_type { 155 const char *name; 156 unsigned int op; /* Really enum afs_fs_operation */ 157 158 /* deliver request or reply data to an call 159 * - returning an error will cause the call to be aborted 160 */ 161 int (*deliver)(struct afs_call *call); 162 163 /* clean up a call */ 164 void (*destructor)(struct afs_call *call); 165 166 /* Work function */ 167 void (*work)(struct work_struct *work); 168 169 /* Call done function (gets called immediately on success or failure) */ 170 void (*done)(struct afs_call *call); 171 }; 172 173 /* 174 * Key available for writeback on a file. 175 */ 176 struct afs_wb_key { 177 refcount_t usage; 178 struct key *key; 179 struct list_head vnode_link; /* Link in vnode->wb_keys */ 180 }; 181 182 /* 183 * AFS open file information record. Pointed to by file->private_data. 184 */ 185 struct afs_file { 186 struct key *key; /* The key this file was opened with */ 187 struct afs_wb_key *wb; /* Writeback key record for this file */ 188 }; 189 190 static inline struct key *afs_file_key(struct file *file) 191 { 192 struct afs_file *af = file->private_data; 193 194 return af->key; 195 } 196 197 /* 198 * Record of an outstanding read operation on a vnode. 199 */ 200 struct afs_read { 201 loff_t pos; /* Where to start reading */ 202 loff_t len; /* How much we're asking for */ 203 loff_t actual_len; /* How much we're actually getting */ 204 loff_t remain; /* Amount remaining */ 205 loff_t file_size; /* File size returned by server */ 206 afs_dataversion_t data_version; /* Version number returned by server */ 207 refcount_t usage; 208 unsigned int index; /* Which page we're reading into */ 209 unsigned int nr_pages; 210 unsigned int offset; /* offset into current page */ 211 void (*page_done)(struct afs_call *, struct afs_read *); 212 struct page **pages; 213 struct page *array[]; 214 }; 215 216 /* 217 * AFS superblock private data 218 * - there's one superblock per volume 219 */ 220 struct afs_super_info { 221 struct net *net_ns; /* Network namespace */ 222 struct afs_cell *cell; /* The cell in which the volume resides */ 223 struct afs_volume *volume; /* volume record */ 224 bool dyn_root; /* True if dynamic root */ 225 }; 226 227 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 228 { 229 return sb->s_fs_info; 230 } 231 232 extern struct file_system_type afs_fs_type; 233 234 /* 235 * Set of substitutes for @sys. 236 */ 237 struct afs_sysnames { 238 #define AFS_NR_SYSNAME 16 239 char *subs[AFS_NR_SYSNAME]; 240 refcount_t usage; 241 unsigned short nr; 242 char blank[1]; 243 }; 244 245 /* 246 * AFS network namespace record. 247 */ 248 struct afs_net { 249 struct net *net; /* Backpointer to the owning net namespace */ 250 struct afs_uuid uuid; 251 bool live; /* F if this namespace is being removed */ 252 253 /* AF_RXRPC I/O stuff */ 254 struct socket *socket; 255 struct afs_call *spare_incoming_call; 256 struct work_struct charge_preallocation_work; 257 struct mutex socket_mutex; 258 atomic_t nr_outstanding_calls; 259 atomic_t nr_superblocks; 260 261 /* Cell database */ 262 struct rb_root cells; 263 struct afs_cell __rcu *ws_cell; 264 struct work_struct cells_manager; 265 struct timer_list cells_timer; 266 atomic_t cells_outstanding; 267 seqlock_t cells_lock; 268 269 struct mutex proc_cells_lock; 270 struct hlist_head proc_cells; 271 272 /* Known servers. Theoretically each fileserver can only be in one 273 * cell, but in practice, people create aliases and subsets and there's 274 * no easy way to distinguish them. 275 */ 276 seqlock_t fs_lock; /* For fs_servers */ 277 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 278 struct list_head fs_updates; /* afs_server (by update_at) */ 279 struct hlist_head fs_proc; /* procfs servers list */ 280 281 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 282 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 283 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 284 285 struct work_struct fs_manager; 286 struct timer_list fs_timer; 287 atomic_t servers_outstanding; 288 289 /* File locking renewal management */ 290 struct mutex lock_manager_mutex; 291 292 /* Misc */ 293 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 294 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 295 struct afs_sysnames *sysnames; 296 rwlock_t sysnames_lock; 297 298 /* Statistics counters */ 299 atomic_t n_lookup; /* Number of lookups done */ 300 atomic_t n_reval; /* Number of dentries needing revalidation */ 301 atomic_t n_inval; /* Number of invalidations by the server */ 302 atomic_t n_relpg; /* Number of invalidations by releasepage */ 303 atomic_t n_read_dir; /* Number of directory pages read */ 304 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 305 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 306 atomic_t n_stores; /* Number of store ops */ 307 atomic_long_t n_store_bytes; /* Number of bytes stored */ 308 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 309 atomic_t n_fetches; /* Number of data fetch ops */ 310 }; 311 312 extern const char afs_init_sysname[]; 313 314 enum afs_cell_state { 315 AFS_CELL_UNSET, 316 AFS_CELL_ACTIVATING, 317 AFS_CELL_ACTIVE, 318 AFS_CELL_DEACTIVATING, 319 AFS_CELL_INACTIVE, 320 AFS_CELL_FAILED, 321 }; 322 323 /* 324 * AFS cell record. 325 * 326 * This is a tricky concept to get right as it is possible to create aliases 327 * simply by pointing AFSDB/SRV records for two names at the same set of VL 328 * servers; it is also possible to do things like setting up two sets of VL 329 * servers, one of which provides a superset of the volumes provided by the 330 * other (for internal/external division, for example). 331 * 332 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 333 * servers and (b) a cell's name is used by the client to select the key to use 334 * for authentication and encryption. The cell name is not typically used in 335 * the protocol. 336 * 337 * There is no easy way to determine if two cells are aliases or one is a 338 * subset of another. 339 */ 340 struct afs_cell { 341 union { 342 struct rcu_head rcu; 343 struct rb_node net_node; /* Node in net->cells */ 344 }; 345 struct afs_net *net; 346 struct key *anonymous_key; /* anonymous user key for this cell */ 347 struct work_struct manager; /* Manager for init/deinit/dns */ 348 struct hlist_node proc_link; /* /proc cell list link */ 349 #ifdef CONFIG_AFS_FSCACHE 350 struct fscache_cookie *cache; /* caching cookie */ 351 #endif 352 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 353 time64_t last_inactive; /* Time of last drop of usage count */ 354 atomic_t usage; 355 unsigned long flags; 356 #define AFS_CELL_FL_NOT_READY 0 /* The cell record is not ready for use */ 357 #define AFS_CELL_FL_NO_GC 1 /* The cell was added manually, don't auto-gc */ 358 #define AFS_CELL_FL_NOT_FOUND 2 /* Permanent DNS error */ 359 #define AFS_CELL_FL_DNS_FAIL 3 /* Failed to access DNS */ 360 #define AFS_CELL_FL_NO_LOOKUP_YET 4 /* Not completed first DNS lookup yet */ 361 enum afs_cell_state state; 362 short error; 363 364 /* Active fileserver interaction state. */ 365 struct list_head proc_volumes; /* procfs volume list */ 366 rwlock_t proc_lock; 367 368 /* VL server list. */ 369 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 370 struct afs_vlserver_list __rcu *vl_servers; 371 372 u8 name_len; /* Length of name */ 373 char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */ 374 }; 375 376 /* 377 * Volume Location server record. 378 */ 379 struct afs_vlserver { 380 struct rcu_head rcu; 381 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 382 unsigned long flags; 383 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 384 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 385 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 386 rwlock_t lock; /* Lock on addresses */ 387 atomic_t usage; 388 389 /* Probe state */ 390 wait_queue_head_t probe_wq; 391 atomic_t probe_outstanding; 392 spinlock_t probe_lock; 393 struct { 394 unsigned int rtt; /* RTT as ktime/64 */ 395 u32 abort_code; 396 short error; 397 bool have_result; 398 bool responded:1; 399 bool is_yfs:1; 400 bool not_yfs:1; 401 bool local_failure:1; 402 } probe; 403 404 u16 port; 405 u16 name_len; /* Length of name */ 406 char name[]; /* Server name, case-flattened */ 407 }; 408 409 /* 410 * Weighted list of Volume Location servers. 411 */ 412 struct afs_vlserver_entry { 413 u16 priority; /* Preference (as SRV) */ 414 u16 weight; /* Weight (as SRV) */ 415 enum dns_record_source source:8; 416 enum dns_lookup_status status:8; 417 struct afs_vlserver *server; 418 }; 419 420 struct afs_vlserver_list { 421 struct rcu_head rcu; 422 atomic_t usage; 423 u8 nr_servers; 424 u8 index; /* Server currently in use */ 425 u8 preferred; /* Preferred server */ 426 enum dns_record_source source:8; 427 enum dns_lookup_status status:8; 428 rwlock_t lock; 429 struct afs_vlserver_entry servers[]; 430 }; 431 432 /* 433 * Cached VLDB entry. 434 * 435 * This is pointed to by cell->vldb_entries, indexed by name. 436 */ 437 struct afs_vldb_entry { 438 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 439 440 unsigned long flags; 441 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 442 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 443 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 444 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 445 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 446 447 uuid_t fs_server[AFS_NMAXNSERVERS]; 448 u8 fs_mask[AFS_NMAXNSERVERS]; 449 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 450 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 451 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 452 short error; 453 u8 nr_servers; /* Number of server records */ 454 u8 name_len; 455 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 456 }; 457 458 /* 459 * Record of fileserver with which we're actively communicating. 460 */ 461 struct afs_server { 462 struct rcu_head rcu; 463 union { 464 uuid_t uuid; /* Server ID */ 465 struct afs_uuid _uuid; 466 }; 467 468 struct afs_addr_list __rcu *addresses; 469 struct rb_node uuid_rb; /* Link in net->servers */ 470 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 471 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 472 struct hlist_node proc_link; /* Link in net->fs_proc */ 473 struct afs_server *gc_next; /* Next server in manager's list */ 474 time64_t put_time; /* Time at which last put */ 475 time64_t update_at; /* Time at which to next update the record */ 476 unsigned long flags; 477 #define AFS_SERVER_FL_NEW 0 /* New server, don't inc cb_s_break */ 478 #define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */ 479 #define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */ 480 #define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */ 481 #define AFS_SERVER_FL_UPDATING 4 482 #define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */ 483 #define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */ 484 #define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */ 485 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 486 #define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */ 487 #define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */ 488 #define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */ 489 atomic_t usage; 490 u32 addr_version; /* Address list version */ 491 u32 cm_epoch; /* Server RxRPC epoch */ 492 493 /* file service access */ 494 rwlock_t fs_lock; /* access lock */ 495 496 /* callback promise management */ 497 struct hlist_head cb_volumes; /* List of volume interests on this server */ 498 unsigned cb_s_break; /* Break-everything counter. */ 499 rwlock_t cb_break_lock; /* Volume finding lock */ 500 501 /* Probe state */ 502 wait_queue_head_t probe_wq; 503 atomic_t probe_outstanding; 504 spinlock_t probe_lock; 505 struct { 506 unsigned int rtt; /* RTT as ktime/64 */ 507 u32 abort_code; 508 u32 cm_epoch; 509 short error; 510 bool have_result; 511 bool responded:1; 512 bool is_yfs:1; 513 bool not_yfs:1; 514 bool local_failure:1; 515 bool no_epoch:1; 516 bool cm_probed:1; 517 bool said_rebooted:1; 518 bool said_inconsistent:1; 519 } probe; 520 }; 521 522 /* 523 * Volume collation in the server's callback interest list. 524 */ 525 struct afs_vol_interest { 526 struct hlist_node srv_link; /* Link in server->cb_volumes */ 527 struct hlist_head cb_interests; /* List of callback interests on the server */ 528 afs_volid_t vid; /* Volume ID to match */ 529 unsigned int usage; 530 }; 531 532 /* 533 * Interest by a superblock on a server. 534 */ 535 struct afs_cb_interest { 536 struct hlist_node cb_vlink; /* Link in vol_interest->cb_interests */ 537 struct afs_vol_interest *vol_interest; 538 struct afs_server *server; /* Server on which this interest resides */ 539 struct super_block *sb; /* Superblock on which inodes reside */ 540 afs_volid_t vid; /* Volume ID to match */ 541 refcount_t usage; 542 }; 543 544 /* 545 * Replaceable server list. 546 */ 547 struct afs_server_entry { 548 struct afs_server *server; 549 struct afs_cb_interest *cb_interest; 550 }; 551 552 struct afs_server_list { 553 refcount_t usage; 554 unsigned char nr_servers; 555 unsigned char preferred; /* Preferred server */ 556 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 557 unsigned int seq; /* Set to ->servers_seq when installed */ 558 rwlock_t lock; 559 struct afs_server_entry servers[]; 560 }; 561 562 /* 563 * Live AFS volume management. 564 */ 565 struct afs_volume { 566 afs_volid_t vid; /* volume ID */ 567 atomic_t usage; 568 time64_t update_at; /* Time at which to next update */ 569 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 570 struct list_head proc_link; /* Link in cell->vl_proc */ 571 unsigned long flags; 572 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 573 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 574 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 575 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 576 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 577 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 578 #ifdef CONFIG_AFS_FSCACHE 579 struct fscache_cookie *cache; /* caching cookie */ 580 #endif 581 struct afs_server_list *servers; /* List of servers on which volume resides */ 582 rwlock_t servers_lock; /* Lock for ->servers */ 583 unsigned int servers_seq; /* Incremented each time ->servers changes */ 584 585 unsigned cb_v_break; /* Break-everything counter. */ 586 rwlock_t cb_break_lock; 587 588 afs_voltype_t type; /* type of volume */ 589 short error; 590 char type_force; /* force volume type (suppress R/O -> R/W) */ 591 u8 name_len; 592 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 593 }; 594 595 enum afs_lock_state { 596 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 597 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 598 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 599 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 600 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 601 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 602 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 603 }; 604 605 /* 606 * AFS inode private data. 607 * 608 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 609 * leak from one inode to another. 610 */ 611 struct afs_vnode { 612 struct inode vfs_inode; /* the VFS's inode record */ 613 614 struct afs_volume *volume; /* volume on which vnode resides */ 615 struct afs_fid fid; /* the file identifier for this inode */ 616 struct afs_file_status status; /* AFS status info for this file */ 617 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 618 #ifdef CONFIG_AFS_FSCACHE 619 struct fscache_cookie *cache; /* caching cookie */ 620 #endif 621 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 622 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 623 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 624 spinlock_t wb_lock; /* lock for wb_keys */ 625 spinlock_t lock; /* waitqueue/flags lock */ 626 unsigned long flags; 627 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 628 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 629 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 630 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 631 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 632 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 633 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 634 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 635 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 636 637 struct list_head wb_keys; /* List of keys available for writeback */ 638 struct list_head pending_locks; /* locks waiting to be granted */ 639 struct list_head granted_locks; /* locks granted on this file */ 640 struct delayed_work lock_work; /* work to be done in locking */ 641 struct key *lock_key; /* Key to be used in lock ops */ 642 enum afs_lock_state lock_state : 8; 643 afs_lock_type_t lock_type : 8; 644 645 /* outstanding callback notification on this file */ 646 struct afs_cb_interest *cb_interest; /* Server on which this resides */ 647 unsigned int cb_s_break; /* Mass break counter on ->server */ 648 unsigned int cb_v_break; /* Mass break counter on ->volume */ 649 unsigned int cb_break; /* Break counter on vnode */ 650 seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */ 651 652 time64_t cb_expires_at; /* time at which callback expires */ 653 unsigned cb_version; /* callback version */ 654 afs_callback_type_t cb_type; /* type of callback */ 655 }; 656 657 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 658 { 659 #ifdef CONFIG_AFS_FSCACHE 660 return vnode->cache; 661 #else 662 return NULL; 663 #endif 664 } 665 666 /* 667 * cached security record for one user's attempt to access a vnode 668 */ 669 struct afs_permit { 670 struct key *key; /* RxRPC ticket holding a security context */ 671 afs_access_t access; /* CallerAccess value for this key */ 672 }; 673 674 /* 675 * Immutable cache of CallerAccess records from attempts to access vnodes. 676 * These may be shared between multiple vnodes. 677 */ 678 struct afs_permits { 679 struct rcu_head rcu; 680 struct hlist_node hash_node; /* Link in hash */ 681 unsigned long h; /* Hash value for this permit list */ 682 refcount_t usage; 683 unsigned short nr_permits; /* Number of records */ 684 bool invalidated; /* Invalidated due to key change */ 685 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 686 }; 687 688 /* 689 * record of one of a system's set of network interfaces 690 */ 691 struct afs_interface { 692 struct in_addr address; /* IPv4 address bound to interface */ 693 struct in_addr netmask; /* netmask applied to address */ 694 unsigned mtu; /* MTU of interface */ 695 }; 696 697 /* 698 * Error prioritisation and accumulation. 699 */ 700 struct afs_error { 701 short error; /* Accumulated error */ 702 bool responded; /* T if server responded */ 703 }; 704 705 /* 706 * Cursor for iterating over a server's address list. 707 */ 708 struct afs_addr_cursor { 709 struct afs_addr_list *alist; /* Current address list (pins ref) */ 710 unsigned long tried; /* Tried addresses */ 711 signed char index; /* Current address */ 712 bool responded; /* T if the current address responded */ 713 unsigned short nr_iterations; /* Number of address iterations */ 714 short error; 715 u32 abort_code; 716 }; 717 718 /* 719 * Cursor for iterating over a set of volume location servers. 720 */ 721 struct afs_vl_cursor { 722 struct afs_addr_cursor ac; 723 struct afs_cell *cell; /* The cell we're querying */ 724 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 725 struct afs_vlserver *server; /* Server on which this resides */ 726 struct key *key; /* Key for the server */ 727 unsigned long untried; /* Bitmask of untried servers */ 728 short index; /* Current server */ 729 short error; 730 unsigned short flags; 731 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 732 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 733 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 734 unsigned short nr_iterations; /* Number of server iterations */ 735 }; 736 737 /* 738 * Cursor for iterating over a set of fileservers. 739 */ 740 struct afs_fs_cursor { 741 struct afs_addr_cursor ac; 742 struct afs_vnode *vnode; 743 struct afs_server_list *server_list; /* Current server list (pins ref) */ 744 struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */ 745 struct key *key; /* Key for the server */ 746 unsigned long untried; /* Bitmask of untried servers */ 747 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 748 unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */ 749 short index; /* Current server */ 750 short error; 751 unsigned short flags; 752 #define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */ 753 #define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */ 754 #define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */ 755 #define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */ 756 #define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 757 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 758 unsigned short nr_iterations; /* Number of server iterations */ 759 }; 760 761 /* 762 * Cache auxiliary data. 763 */ 764 struct afs_vnode_cache_aux { 765 u64 data_version; 766 } __packed; 767 768 #include <trace/events/afs.h> 769 770 /*****************************************************************************/ 771 /* 772 * addr_list.c 773 */ 774 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 775 { 776 if (alist) 777 refcount_inc(&alist->usage); 778 return alist; 779 } 780 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 781 unsigned short, 782 unsigned short); 783 extern void afs_put_addrlist(struct afs_addr_list *); 784 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 785 const char *, size_t, char, 786 unsigned short, unsigned short); 787 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 788 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 789 extern int afs_end_cursor(struct afs_addr_cursor *); 790 791 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 792 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 793 794 /* 795 * cache.c 796 */ 797 #ifdef CONFIG_AFS_FSCACHE 798 extern struct fscache_netfs afs_cache_netfs; 799 extern struct fscache_cookie_def afs_cell_cache_index_def; 800 extern struct fscache_cookie_def afs_volume_cache_index_def; 801 extern struct fscache_cookie_def afs_vnode_cache_index_def; 802 #else 803 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 804 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 805 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 806 #endif 807 808 /* 809 * callback.c 810 */ 811 extern void afs_init_callback_state(struct afs_server *); 812 extern void __afs_break_callback(struct afs_vnode *); 813 extern void afs_break_callback(struct afs_vnode *); 814 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*); 815 816 extern int afs_register_server_cb_interest(struct afs_vnode *, 817 struct afs_server_list *, unsigned int); 818 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *); 819 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *); 820 821 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi) 822 { 823 if (cbi) 824 refcount_inc(&cbi->usage); 825 return cbi; 826 } 827 828 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 829 { 830 return vnode->cb_break + vnode->cb_s_break + vnode->cb_v_break; 831 } 832 833 static inline bool afs_cb_is_broken(unsigned int cb_break, 834 const struct afs_vnode *vnode, 835 const struct afs_cb_interest *cbi) 836 { 837 return !cbi || cb_break != (vnode->cb_break + 838 cbi->server->cb_s_break + 839 vnode->volume->cb_v_break); 840 } 841 842 /* 843 * cell.c 844 */ 845 extern int afs_cell_init(struct afs_net *, const char *); 846 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 847 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 848 const char *, bool); 849 extern struct afs_cell *afs_get_cell(struct afs_cell *); 850 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 851 extern void afs_manage_cells(struct work_struct *); 852 extern void afs_cells_timer(struct timer_list *); 853 extern void __net_exit afs_cell_purge(struct afs_net *); 854 855 /* 856 * cmservice.c 857 */ 858 extern bool afs_cm_incoming_call(struct afs_call *); 859 860 /* 861 * dir.c 862 */ 863 extern const struct file_operations afs_dir_file_operations; 864 extern const struct inode_operations afs_dir_inode_operations; 865 extern const struct address_space_operations afs_dir_aops; 866 extern const struct dentry_operations afs_fs_dentry_operations; 867 868 extern void afs_d_release(struct dentry *); 869 870 /* 871 * dir_edit.c 872 */ 873 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 874 enum afs_edit_dir_reason); 875 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 876 877 /* 878 * dynroot.c 879 */ 880 extern const struct file_operations afs_dynroot_file_operations; 881 extern const struct inode_operations afs_dynroot_inode_operations; 882 extern const struct dentry_operations afs_dynroot_dentry_operations; 883 884 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 885 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 886 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 887 extern int afs_dynroot_populate(struct super_block *); 888 extern void afs_dynroot_depopulate(struct super_block *); 889 890 /* 891 * file.c 892 */ 893 extern const struct address_space_operations afs_fs_aops; 894 extern const struct inode_operations afs_file_inode_operations; 895 extern const struct file_operations afs_file_operations; 896 897 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 898 extern void afs_put_wb_key(struct afs_wb_key *); 899 extern int afs_open(struct inode *, struct file *); 900 extern int afs_release(struct inode *, struct file *); 901 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 902 extern int afs_page_filler(void *, struct page *); 903 extern void afs_put_read(struct afs_read *); 904 905 /* 906 * flock.c 907 */ 908 extern struct workqueue_struct *afs_lock_manager; 909 910 extern void afs_lock_work(struct work_struct *); 911 extern void afs_lock_may_be_available(struct afs_vnode *); 912 extern int afs_lock(struct file *, int, struct file_lock *); 913 extern int afs_flock(struct file *, int, struct file_lock *); 914 915 /* 916 * fsclient.c 917 */ 918 #define AFS_VNODE_NOT_YET_SET 0x01 919 #define AFS_VNODE_META_CHANGED 0x02 920 #define AFS_VNODE_DATA_CHANGED 0x04 921 extern void afs_update_inode_from_status(struct afs_vnode *, struct afs_file_status *, 922 const afs_dataversion_t *, u8); 923 924 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool); 925 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *); 926 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *); 927 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t, u64, 928 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 929 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, u64); 930 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 931 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64, 932 struct afs_fid *, struct afs_file_status *); 933 extern int afs_fs_rename(struct afs_fs_cursor *, const char *, 934 struct afs_vnode *, const char *, u64, u64); 935 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 936 pgoff_t, pgoff_t, unsigned, unsigned); 937 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *); 938 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 939 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t); 940 extern int afs_fs_extend_lock(struct afs_fs_cursor *); 941 extern int afs_fs_release_lock(struct afs_fs_cursor *); 942 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 943 struct afs_addr_cursor *, struct key *); 944 extern int afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 945 struct afs_addr_cursor *, struct key *, unsigned int, bool); 946 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 947 struct afs_fid *, struct afs_file_status *, 948 struct afs_callback *, unsigned int, 949 struct afs_volsync *); 950 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 951 struct afs_fid *, struct afs_file_status *, 952 struct afs_callback *, struct afs_volsync *); 953 954 /* 955 * fs_probe.c 956 */ 957 extern void afs_fileserver_probe_result(struct afs_call *); 958 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *); 959 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 960 961 /* 962 * inode.c 963 */ 964 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool); 965 extern int afs_iget5_test(struct inode *, void *); 966 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 967 extern struct inode *afs_iget(struct super_block *, struct key *, 968 struct afs_fid *, struct afs_file_status *, 969 struct afs_callback *, 970 struct afs_cb_interest *); 971 extern void afs_zap_data(struct afs_vnode *); 972 extern int afs_validate(struct afs_vnode *, struct key *); 973 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 974 extern int afs_setattr(struct dentry *, struct iattr *); 975 extern void afs_evict_inode(struct inode *); 976 extern int afs_drop_inode(struct inode *); 977 978 /* 979 * main.c 980 */ 981 extern struct workqueue_struct *afs_wq; 982 extern int afs_net_id; 983 984 static inline struct afs_net *afs_net(struct net *net) 985 { 986 return net_generic(net, afs_net_id); 987 } 988 989 static inline struct afs_net *afs_sb2net(struct super_block *sb) 990 { 991 return afs_net(AFS_FS_S(sb)->net_ns); 992 } 993 994 static inline struct afs_net *afs_d2net(struct dentry *dentry) 995 { 996 return afs_sb2net(dentry->d_sb); 997 } 998 999 static inline struct afs_net *afs_i2net(struct inode *inode) 1000 { 1001 return afs_sb2net(inode->i_sb); 1002 } 1003 1004 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1005 { 1006 return afs_i2net(&vnode->vfs_inode); 1007 } 1008 1009 static inline struct afs_net *afs_sock2net(struct sock *sk) 1010 { 1011 return net_generic(sock_net(sk), afs_net_id); 1012 } 1013 1014 static inline void __afs_stat(atomic_t *s) 1015 { 1016 atomic_inc(s); 1017 } 1018 1019 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1020 1021 /* 1022 * misc.c 1023 */ 1024 extern int afs_abort_to_error(u32); 1025 extern void afs_prioritise_error(struct afs_error *, int, u32); 1026 1027 /* 1028 * mntpt.c 1029 */ 1030 extern const struct inode_operations afs_mntpt_inode_operations; 1031 extern const struct inode_operations afs_autocell_inode_operations; 1032 extern const struct file_operations afs_mntpt_file_operations; 1033 1034 extern struct vfsmount *afs_d_automount(struct path *); 1035 extern void afs_mntpt_kill_timer(void); 1036 1037 /* 1038 * netdevices.c 1039 */ 1040 extern int afs_get_ipv4_interfaces(struct afs_net *, struct afs_interface *, 1041 size_t, bool); 1042 1043 /* 1044 * proc.c 1045 */ 1046 #ifdef CONFIG_PROC_FS 1047 extern int __net_init afs_proc_init(struct afs_net *); 1048 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1049 extern int afs_proc_cell_setup(struct afs_cell *); 1050 extern void afs_proc_cell_remove(struct afs_cell *); 1051 extern void afs_put_sysnames(struct afs_sysnames *); 1052 #else 1053 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1054 static inline void afs_proc_cleanup(struct afs_net *net) {} 1055 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1056 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1057 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1058 #endif 1059 1060 /* 1061 * rotate.c 1062 */ 1063 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *, 1064 struct key *); 1065 extern bool afs_select_fileserver(struct afs_fs_cursor *); 1066 extern bool afs_select_current_fileserver(struct afs_fs_cursor *); 1067 extern int afs_end_vnode_operation(struct afs_fs_cursor *); 1068 1069 /* 1070 * rxrpc.c 1071 */ 1072 extern struct workqueue_struct *afs_async_calls; 1073 1074 extern int __net_init afs_open_socket(struct afs_net *); 1075 extern void __net_exit afs_close_socket(struct afs_net *); 1076 extern void afs_charge_preallocation(struct work_struct *); 1077 extern void afs_put_call(struct afs_call *); 1078 extern long afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t, bool); 1079 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1080 const struct afs_call_type *, 1081 size_t, size_t); 1082 extern void afs_flat_call_destructor(struct afs_call *); 1083 extern void afs_send_empty_reply(struct afs_call *); 1084 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1085 extern int afs_extract_data(struct afs_call *, bool); 1086 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause); 1087 1088 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1089 { 1090 call->kvec[0].iov_base = buf; 1091 call->kvec[0].iov_len = size; 1092 iov_iter_kvec(&call->iter, READ, call->kvec, 1, size); 1093 } 1094 1095 static inline void afs_extract_to_tmp(struct afs_call *call) 1096 { 1097 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1098 } 1099 1100 static inline void afs_extract_to_tmp64(struct afs_call *call) 1101 { 1102 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1103 } 1104 1105 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1106 { 1107 iov_iter_discard(&call->iter, READ, size); 1108 } 1109 1110 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1111 { 1112 afs_extract_begin(call, call->buffer, size); 1113 } 1114 1115 static inline int afs_transfer_reply(struct afs_call *call) 1116 { 1117 return afs_extract_data(call, false); 1118 } 1119 1120 static inline bool afs_check_call_state(struct afs_call *call, 1121 enum afs_call_state state) 1122 { 1123 return READ_ONCE(call->state) == state; 1124 } 1125 1126 static inline bool afs_set_call_state(struct afs_call *call, 1127 enum afs_call_state from, 1128 enum afs_call_state to) 1129 { 1130 bool ok = false; 1131 1132 spin_lock_bh(&call->state_lock); 1133 if (call->state == from) { 1134 call->state = to; 1135 trace_afs_call_state(call, from, to, 0, 0); 1136 ok = true; 1137 } 1138 spin_unlock_bh(&call->state_lock); 1139 return ok; 1140 } 1141 1142 static inline void afs_set_call_complete(struct afs_call *call, 1143 int error, u32 remote_abort) 1144 { 1145 enum afs_call_state state; 1146 bool ok = false; 1147 1148 spin_lock_bh(&call->state_lock); 1149 state = call->state; 1150 if (state != AFS_CALL_COMPLETE) { 1151 call->abort_code = remote_abort; 1152 call->error = error; 1153 call->state = AFS_CALL_COMPLETE; 1154 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1155 error, remote_abort); 1156 ok = true; 1157 } 1158 spin_unlock_bh(&call->state_lock); 1159 if (ok) 1160 trace_afs_call_done(call); 1161 } 1162 1163 /* 1164 * security.c 1165 */ 1166 extern void afs_put_permits(struct afs_permits *); 1167 extern void afs_clear_permits(struct afs_vnode *); 1168 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int); 1169 extern void afs_zap_permits(struct rcu_head *); 1170 extern struct key *afs_request_key(struct afs_cell *); 1171 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1172 extern int afs_permission(struct inode *, int); 1173 extern void __exit afs_clean_up_permit_cache(void); 1174 1175 /* 1176 * server.c 1177 */ 1178 extern spinlock_t afs_server_peer_lock; 1179 1180 static inline struct afs_server *afs_get_server(struct afs_server *server) 1181 { 1182 atomic_inc(&server->usage); 1183 return server; 1184 } 1185 1186 extern struct afs_server *afs_find_server(struct afs_net *, 1187 const struct sockaddr_rxrpc *); 1188 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1189 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *); 1190 extern void afs_put_server(struct afs_net *, struct afs_server *); 1191 extern void afs_manage_servers(struct work_struct *); 1192 extern void afs_servers_timer(struct timer_list *); 1193 extern void __net_exit afs_purge_servers(struct afs_net *); 1194 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *); 1195 1196 /* 1197 * server_list.c 1198 */ 1199 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1200 { 1201 refcount_inc(&slist->usage); 1202 return slist; 1203 } 1204 1205 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1206 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1207 struct afs_vldb_entry *, 1208 u8); 1209 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1210 1211 /* 1212 * super.c 1213 */ 1214 extern int __init afs_fs_init(void); 1215 extern void afs_fs_exit(void); 1216 1217 /* 1218 * vlclient.c 1219 */ 1220 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1221 const char *, int); 1222 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1223 extern int afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, struct key *, 1224 struct afs_vlserver *, unsigned int, bool); 1225 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1226 1227 /* 1228 * vl_probe.c 1229 */ 1230 extern void afs_vlserver_probe_result(struct afs_call *); 1231 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1232 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1233 1234 /* 1235 * vl_rotate.c 1236 */ 1237 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1238 struct afs_cell *, struct key *); 1239 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1240 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1241 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1242 1243 /* 1244 * vlserver_list.c 1245 */ 1246 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1247 { 1248 atomic_inc(&vlserver->usage); 1249 return vlserver; 1250 } 1251 1252 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1253 { 1254 if (vllist) 1255 atomic_inc(&vllist->usage); 1256 return vllist; 1257 } 1258 1259 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1260 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1261 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1262 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1263 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1264 const void *, size_t); 1265 1266 /* 1267 * volume.c 1268 */ 1269 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume) 1270 { 1271 if (volume) 1272 atomic_inc(&volume->usage); 1273 return volume; 1274 } 1275 1276 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1277 extern void afs_activate_volume(struct afs_volume *); 1278 extern void afs_deactivate_volume(struct afs_volume *); 1279 extern void afs_put_volume(struct afs_cell *, struct afs_volume *); 1280 extern int afs_check_volume_status(struct afs_volume *, struct key *); 1281 1282 /* 1283 * write.c 1284 */ 1285 extern int afs_set_page_dirty(struct page *); 1286 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1287 loff_t pos, unsigned len, unsigned flags, 1288 struct page **pagep, void **fsdata); 1289 extern int afs_write_end(struct file *file, struct address_space *mapping, 1290 loff_t pos, unsigned len, unsigned copied, 1291 struct page *page, void *fsdata); 1292 extern int afs_writepage(struct page *, struct writeback_control *); 1293 extern int afs_writepages(struct address_space *, struct writeback_control *); 1294 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 1295 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1296 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1297 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1298 extern void afs_prune_wb_keys(struct afs_vnode *); 1299 extern int afs_launder_page(struct page *); 1300 1301 /* 1302 * xattr.c 1303 */ 1304 extern const struct xattr_handler *afs_xattr_handlers[]; 1305 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1306 1307 /* 1308 * yfsclient.c 1309 */ 1310 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool); 1311 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *); 1312 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, u64, 1313 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 1314 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, u64, 1315 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 1316 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 1317 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, u64); 1318 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 1319 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64, 1320 struct afs_fid *, struct afs_file_status *); 1321 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, 1322 struct afs_vnode *, const char *, u64, u64); 1323 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 1324 pgoff_t, pgoff_t, unsigned, unsigned); 1325 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *); 1326 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 1327 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t); 1328 extern int yfs_fs_extend_lock(struct afs_fs_cursor *); 1329 extern int yfs_fs_release_lock(struct afs_fs_cursor *); 1330 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 1331 struct afs_fid *, struct afs_file_status *, 1332 struct afs_callback *, struct afs_volsync *); 1333 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 1334 struct afs_fid *, struct afs_file_status *, 1335 struct afs_callback *, unsigned int, 1336 struct afs_volsync *); 1337 1338 /* 1339 * Miscellaneous inline functions. 1340 */ 1341 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1342 { 1343 return container_of(inode, struct afs_vnode, vfs_inode); 1344 } 1345 1346 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1347 { 1348 return &vnode->vfs_inode; 1349 } 1350 1351 static inline void afs_vnode_commit_status(struct afs_fs_cursor *fc, 1352 struct afs_vnode *vnode, 1353 unsigned int cb_break) 1354 { 1355 if (fc->ac.error == 0) 1356 afs_cache_permit(vnode, fc->key, cb_break); 1357 } 1358 1359 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc, 1360 struct afs_vnode *vnode) 1361 { 1362 if (fc->ac.error == -ENOENT) { 1363 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1364 afs_break_callback(vnode); 1365 } 1366 } 1367 1368 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1369 { 1370 trace_afs_io_error(call->debug_id, -EIO, where); 1371 return -EIO; 1372 } 1373 1374 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1375 { 1376 trace_afs_file_error(vnode, -EIO, where); 1377 return -EIO; 1378 } 1379 1380 /*****************************************************************************/ 1381 /* 1382 * debug tracing 1383 */ 1384 extern unsigned afs_debug; 1385 1386 #define dbgprintk(FMT,...) \ 1387 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1388 1389 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1390 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1391 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1392 1393 1394 #if defined(__KDEBUG) 1395 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1396 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1397 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1398 1399 #elif defined(CONFIG_AFS_DEBUG) 1400 #define AFS_DEBUG_KENTER 0x01 1401 #define AFS_DEBUG_KLEAVE 0x02 1402 #define AFS_DEBUG_KDEBUG 0x04 1403 1404 #define _enter(FMT,...) \ 1405 do { \ 1406 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1407 kenter(FMT,##__VA_ARGS__); \ 1408 } while (0) 1409 1410 #define _leave(FMT,...) \ 1411 do { \ 1412 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1413 kleave(FMT,##__VA_ARGS__); \ 1414 } while (0) 1415 1416 #define _debug(FMT,...) \ 1417 do { \ 1418 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1419 kdebug(FMT,##__VA_ARGS__); \ 1420 } while (0) 1421 1422 #else 1423 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1424 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1425 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1426 #endif 1427 1428 /* 1429 * debug assertion checking 1430 */ 1431 #if 1 // defined(__KDEBUGALL) 1432 1433 #define ASSERT(X) \ 1434 do { \ 1435 if (unlikely(!(X))) { \ 1436 printk(KERN_ERR "\n"); \ 1437 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1438 BUG(); \ 1439 } \ 1440 } while(0) 1441 1442 #define ASSERTCMP(X, OP, Y) \ 1443 do { \ 1444 if (unlikely(!((X) OP (Y)))) { \ 1445 printk(KERN_ERR "\n"); \ 1446 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1447 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1448 (unsigned long)(X), (unsigned long)(Y)); \ 1449 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1450 (unsigned long)(X), (unsigned long)(Y)); \ 1451 BUG(); \ 1452 } \ 1453 } while(0) 1454 1455 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1456 do { \ 1457 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1458 printk(KERN_ERR "\n"); \ 1459 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1460 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1461 (unsigned long)(L), (unsigned long)(N), \ 1462 (unsigned long)(H)); \ 1463 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1464 (unsigned long)(L), (unsigned long)(N), \ 1465 (unsigned long)(H)); \ 1466 BUG(); \ 1467 } \ 1468 } while(0) 1469 1470 #define ASSERTIF(C, X) \ 1471 do { \ 1472 if (unlikely((C) && !(X))) { \ 1473 printk(KERN_ERR "\n"); \ 1474 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1475 BUG(); \ 1476 } \ 1477 } while(0) 1478 1479 #define ASSERTIFCMP(C, X, OP, Y) \ 1480 do { \ 1481 if (unlikely((C) && !((X) OP (Y)))) { \ 1482 printk(KERN_ERR "\n"); \ 1483 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1484 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1485 (unsigned long)(X), (unsigned long)(Y)); \ 1486 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1487 (unsigned long)(X), (unsigned long)(Y)); \ 1488 BUG(); \ 1489 } \ 1490 } while(0) 1491 1492 #else 1493 1494 #define ASSERT(X) \ 1495 do { \ 1496 } while(0) 1497 1498 #define ASSERTCMP(X, OP, Y) \ 1499 do { \ 1500 } while(0) 1501 1502 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1503 do { \ 1504 } while(0) 1505 1506 #define ASSERTIF(C, X) \ 1507 do { \ 1508 } while(0) 1509 1510 #define ASSERTIFCMP(C, X, OP, Y) \ 1511 do { \ 1512 } while(0) 1513 1514 #endif /* __KDEBUGALL */ 1515