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 enum afs_call_state { 63 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */ 64 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */ 65 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */ 66 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */ 67 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */ 68 AFS_CALL_SV_REPLYING, /* Server: Replying */ 69 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */ 70 AFS_CALL_COMPLETE, /* Completed or failed */ 71 }; 72 73 /* 74 * List of server addresses. 75 */ 76 struct afs_addr_list { 77 struct rcu_head rcu; 78 refcount_t usage; 79 u32 version; /* Version */ 80 unsigned char max_addrs; 81 unsigned char nr_addrs; 82 unsigned char preferred; /* Preferred address */ 83 unsigned char nr_ipv4; /* Number of IPv4 addresses */ 84 enum dns_record_source source:8; 85 enum dns_lookup_status status:8; 86 unsigned long failed; /* Mask of addrs that failed locally/ICMP */ 87 unsigned long responded; /* Mask of addrs that responded */ 88 struct sockaddr_rxrpc addrs[]; 89 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) 90 }; 91 92 /* 93 * a record of an in-progress RxRPC call 94 */ 95 struct afs_call { 96 const struct afs_call_type *type; /* type of call */ 97 struct afs_addr_list *alist; /* Address is alist[addr_ix] */ 98 wait_queue_head_t waitq; /* processes awaiting completion */ 99 struct work_struct async_work; /* async I/O processor */ 100 struct work_struct work; /* actual work processor */ 101 struct rxrpc_call *rxcall; /* RxRPC call handle */ 102 struct key *key; /* security for this call */ 103 struct afs_net *net; /* The network namespace */ 104 struct afs_server *server; /* The fileserver record if fs op (pins ref) */ 105 struct afs_vlserver *vlserver; /* The vlserver record if vl op */ 106 void *request; /* request data (first part) */ 107 struct iov_iter def_iter; /* Default buffer/data iterator */ 108 struct iov_iter *iter; /* Iterator currently in use */ 109 union { /* Convenience for ->def_iter */ 110 struct kvec kvec[1]; 111 struct bio_vec bvec[1]; 112 }; 113 void *buffer; /* reply receive buffer */ 114 union { 115 long ret0; /* Value to reply with instead of 0 */ 116 struct afs_addr_list *ret_alist; 117 struct afs_vldb_entry *ret_vldb; 118 char *ret_str; 119 }; 120 struct afs_operation *op; 121 unsigned int server_index; 122 atomic_t usage; 123 enum afs_call_state state; 124 spinlock_t state_lock; 125 int error; /* error code */ 126 u32 abort_code; /* Remote abort ID or 0 */ 127 unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */ 128 unsigned request_size; /* size of request data */ 129 unsigned reply_max; /* maximum size of reply */ 130 unsigned count2; /* count used in unmarshalling */ 131 unsigned char unmarshall; /* unmarshalling phase */ 132 unsigned char addr_ix; /* Address in ->alist */ 133 bool drop_ref; /* T if need to drop ref for incoming call */ 134 bool send_pages; /* T if data from mapping should be sent */ 135 bool need_attention; /* T if RxRPC poked us */ 136 bool async; /* T if asynchronous */ 137 bool upgrade; /* T to request service upgrade */ 138 bool have_reply_time; /* T if have got reply_time */ 139 bool intr; /* T if interruptible */ 140 bool unmarshalling_error; /* T if an unmarshalling error occurred */ 141 u16 service_id; /* Actual service ID (after upgrade) */ 142 unsigned int debug_id; /* Trace ID */ 143 u32 operation_ID; /* operation ID for an incoming call */ 144 u32 count; /* count for use in unmarshalling */ 145 union { /* place to extract temporary data */ 146 struct { 147 __be32 tmp_u; 148 __be32 tmp; 149 } __attribute__((packed)); 150 __be64 tmp64; 151 }; 152 ktime_t reply_time; /* Time of first reply packet */ 153 }; 154 155 struct afs_call_type { 156 const char *name; 157 unsigned int op; /* Really enum afs_fs_operation */ 158 159 /* deliver request or reply data to an call 160 * - returning an error will cause the call to be aborted 161 */ 162 int (*deliver)(struct afs_call *call); 163 164 /* clean up a call */ 165 void (*destructor)(struct afs_call *call); 166 167 /* Work function */ 168 void (*work)(struct work_struct *work); 169 170 /* Call done function (gets called immediately on success or failure) */ 171 void (*done)(struct afs_call *call); 172 }; 173 174 /* 175 * Key available for writeback on a file. 176 */ 177 struct afs_wb_key { 178 refcount_t usage; 179 struct key *key; 180 struct list_head vnode_link; /* Link in vnode->wb_keys */ 181 }; 182 183 /* 184 * AFS open file information record. Pointed to by file->private_data. 185 */ 186 struct afs_file { 187 struct key *key; /* The key this file was opened with */ 188 struct afs_wb_key *wb; /* Writeback key record for this file */ 189 }; 190 191 static inline struct key *afs_file_key(struct file *file) 192 { 193 struct afs_file *af = file->private_data; 194 195 return af->key; 196 } 197 198 /* 199 * Record of an outstanding read operation on a vnode. 200 */ 201 struct afs_read { 202 loff_t pos; /* Where to start reading */ 203 loff_t len; /* How much we're asking for */ 204 loff_t actual_len; /* How much we're actually getting */ 205 loff_t remain; /* Amount remaining */ 206 loff_t file_size; /* File size returned by server */ 207 afs_dataversion_t data_version; /* Version number returned by server */ 208 refcount_t usage; 209 unsigned int index; /* Which page we're reading into */ 210 unsigned int nr_pages; 211 unsigned int offset; /* offset into current page */ 212 struct afs_vnode *vnode; 213 void (*page_done)(struct afs_read *); 214 struct page **pages; 215 struct page *array[]; 216 }; 217 218 /* 219 * AFS superblock private data 220 * - there's one superblock per volume 221 */ 222 struct afs_super_info { 223 struct net *net_ns; /* Network namespace */ 224 struct afs_cell *cell; /* The cell in which the volume resides */ 225 struct afs_volume *volume; /* volume record */ 226 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 227 bool dyn_root; /* True if dynamic root */ 228 }; 229 230 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 231 { 232 return sb->s_fs_info; 233 } 234 235 extern struct file_system_type afs_fs_type; 236 237 /* 238 * Set of substitutes for @sys. 239 */ 240 struct afs_sysnames { 241 #define AFS_NR_SYSNAME 16 242 char *subs[AFS_NR_SYSNAME]; 243 refcount_t usage; 244 unsigned short nr; 245 char blank[1]; 246 }; 247 248 /* 249 * AFS network namespace record. 250 */ 251 struct afs_net { 252 struct net *net; /* Backpointer to the owning net namespace */ 253 struct afs_uuid uuid; 254 bool live; /* F if this namespace is being removed */ 255 256 /* AF_RXRPC I/O stuff */ 257 struct socket *socket; 258 struct afs_call *spare_incoming_call; 259 struct work_struct charge_preallocation_work; 260 struct mutex socket_mutex; 261 atomic_t nr_outstanding_calls; 262 atomic_t nr_superblocks; 263 264 /* Cell database */ 265 struct rb_root cells; 266 struct afs_cell __rcu *ws_cell; 267 struct work_struct cells_manager; 268 struct timer_list cells_timer; 269 atomic_t cells_outstanding; 270 seqlock_t cells_lock; 271 struct mutex cells_alias_lock; 272 273 struct mutex proc_cells_lock; 274 struct hlist_head proc_cells; 275 276 /* Known servers. Theoretically each fileserver can only be in one 277 * cell, but in practice, people create aliases and subsets and there's 278 * no easy way to distinguish them. 279 */ 280 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */ 281 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 282 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */ 283 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */ 284 struct hlist_head fs_proc; /* procfs servers list */ 285 286 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 287 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 288 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 289 290 struct work_struct fs_manager; 291 struct timer_list fs_timer; 292 293 struct work_struct fs_prober; 294 struct timer_list fs_probe_timer; 295 atomic_t servers_outstanding; 296 297 /* File locking renewal management */ 298 struct mutex lock_manager_mutex; 299 300 /* Misc */ 301 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 302 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 303 struct afs_sysnames *sysnames; 304 rwlock_t sysnames_lock; 305 306 /* Statistics counters */ 307 atomic_t n_lookup; /* Number of lookups done */ 308 atomic_t n_reval; /* Number of dentries needing revalidation */ 309 atomic_t n_inval; /* Number of invalidations by the server */ 310 atomic_t n_relpg; /* Number of invalidations by releasepage */ 311 atomic_t n_read_dir; /* Number of directory pages read */ 312 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 313 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 314 atomic_t n_stores; /* Number of store ops */ 315 atomic_long_t n_store_bytes; /* Number of bytes stored */ 316 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 317 atomic_t n_fetches; /* Number of data fetch ops */ 318 }; 319 320 extern const char afs_init_sysname[]; 321 322 enum afs_cell_state { 323 AFS_CELL_UNSET, 324 AFS_CELL_ACTIVATING, 325 AFS_CELL_ACTIVE, 326 AFS_CELL_DEACTIVATING, 327 AFS_CELL_INACTIVE, 328 AFS_CELL_FAILED, 329 }; 330 331 /* 332 * AFS cell record. 333 * 334 * This is a tricky concept to get right as it is possible to create aliases 335 * simply by pointing AFSDB/SRV records for two names at the same set of VL 336 * servers; it is also possible to do things like setting up two sets of VL 337 * servers, one of which provides a superset of the volumes provided by the 338 * other (for internal/external division, for example). 339 * 340 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 341 * servers and (b) a cell's name is used by the client to select the key to use 342 * for authentication and encryption. The cell name is not typically used in 343 * the protocol. 344 * 345 * Two cells are determined to be aliases if they have an explicit alias (YFS 346 * only), share any VL servers in common or have at least one volume in common. 347 * "In common" means that the address list of the VL servers or the fileservers 348 * share at least one endpoint. 349 */ 350 struct afs_cell { 351 union { 352 struct rcu_head rcu; 353 struct rb_node net_node; /* Node in net->cells */ 354 }; 355 struct afs_net *net; 356 struct afs_cell *alias_of; /* The cell this is an alias of */ 357 struct afs_volume *root_volume; /* The root.cell volume if there is one */ 358 struct key *anonymous_key; /* anonymous user key for this cell */ 359 struct work_struct manager; /* Manager for init/deinit/dns */ 360 struct hlist_node proc_link; /* /proc cell list link */ 361 #ifdef CONFIG_AFS_FSCACHE 362 struct fscache_cookie *cache; /* caching cookie */ 363 #endif 364 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 365 time64_t last_inactive; /* Time of last drop of usage count */ 366 atomic_t usage; 367 unsigned long flags; 368 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 369 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 370 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */ 371 enum afs_cell_state state; 372 short error; 373 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 374 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 375 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 376 377 /* The volumes belonging to this cell */ 378 struct rb_root volumes; /* Tree of volumes on this server */ 379 struct hlist_head proc_volumes; /* procfs volume list */ 380 seqlock_t volume_lock; /* For volumes */ 381 382 /* Active fileserver interaction state. */ 383 struct rb_root fs_servers; /* afs_server (by server UUID) */ 384 seqlock_t fs_lock; /* For fs_servers */ 385 386 /* VL server list. */ 387 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 388 struct afs_vlserver_list __rcu *vl_servers; 389 390 u8 name_len; /* Length of name */ 391 char *name; /* Cell name, case-flattened and NUL-padded */ 392 }; 393 394 /* 395 * Volume Location server record. 396 */ 397 struct afs_vlserver { 398 struct rcu_head rcu; 399 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 400 unsigned long flags; 401 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 402 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 403 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 404 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */ 405 rwlock_t lock; /* Lock on addresses */ 406 atomic_t usage; 407 unsigned int rtt; /* Server's current RTT in uS */ 408 409 /* Probe state */ 410 wait_queue_head_t probe_wq; 411 atomic_t probe_outstanding; 412 spinlock_t probe_lock; 413 struct { 414 unsigned int rtt; /* RTT in uS */ 415 u32 abort_code; 416 short error; 417 unsigned short flags; 418 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */ 419 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */ 420 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */ 421 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */ 422 } probe; 423 424 u16 port; 425 u16 name_len; /* Length of name */ 426 char name[]; /* Server name, case-flattened */ 427 }; 428 429 /* 430 * Weighted list of Volume Location servers. 431 */ 432 struct afs_vlserver_entry { 433 u16 priority; /* Preference (as SRV) */ 434 u16 weight; /* Weight (as SRV) */ 435 enum dns_record_source source:8; 436 enum dns_lookup_status status:8; 437 struct afs_vlserver *server; 438 }; 439 440 struct afs_vlserver_list { 441 struct rcu_head rcu; 442 atomic_t usage; 443 u8 nr_servers; 444 u8 index; /* Server currently in use */ 445 u8 preferred; /* Preferred server */ 446 enum dns_record_source source:8; 447 enum dns_lookup_status status:8; 448 rwlock_t lock; 449 struct afs_vlserver_entry servers[]; 450 }; 451 452 /* 453 * Cached VLDB entry. 454 * 455 * This is pointed to by cell->vldb_entries, indexed by name. 456 */ 457 struct afs_vldb_entry { 458 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 459 460 unsigned long flags; 461 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 462 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 463 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 464 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 465 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 466 467 uuid_t fs_server[AFS_NMAXNSERVERS]; 468 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */ 469 u8 fs_mask[AFS_NMAXNSERVERS]; 470 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 471 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 472 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 473 short error; 474 u8 nr_servers; /* Number of server records */ 475 u8 name_len; 476 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 477 }; 478 479 /* 480 * Record of fileserver with which we're actively communicating. 481 */ 482 struct afs_server { 483 struct rcu_head rcu; 484 union { 485 uuid_t uuid; /* Server ID */ 486 struct afs_uuid _uuid; 487 }; 488 489 struct afs_addr_list __rcu *addresses; 490 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 491 struct rb_node uuid_rb; /* Link in net->fs_servers */ 492 struct afs_server __rcu *uuid_next; /* Next server with same UUID */ 493 struct afs_server *uuid_prev; /* Previous server with same UUID */ 494 struct list_head probe_link; /* Link in net->fs_probe_list */ 495 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 496 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 497 struct hlist_node proc_link; /* Link in net->fs_proc */ 498 struct afs_server *gc_next; /* Next server in manager's list */ 499 time64_t unuse_time; /* Time at which last unused */ 500 unsigned long flags; 501 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 502 #define AFS_SERVER_FL_UPDATING 1 503 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 504 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */ 505 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */ 506 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */ 507 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 508 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 509 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 510 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 511 atomic_t ref; /* Object refcount */ 512 atomic_t active; /* Active user count */ 513 u32 addr_version; /* Address list version */ 514 unsigned int rtt; /* Server's current RTT in uS */ 515 unsigned int debug_id; /* Debugging ID for traces */ 516 517 /* file service access */ 518 rwlock_t fs_lock; /* access lock */ 519 520 /* callback promise management */ 521 unsigned cb_s_break; /* Break-everything counter. */ 522 523 /* Probe state */ 524 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 525 wait_queue_head_t probe_wq; 526 atomic_t probe_outstanding; 527 spinlock_t probe_lock; 528 struct { 529 unsigned int rtt; /* RTT in uS */ 530 u32 abort_code; 531 short error; 532 bool responded:1; 533 bool is_yfs:1; 534 bool not_yfs:1; 535 bool local_failure:1; 536 } probe; 537 }; 538 539 /* 540 * Replaceable volume server list. 541 */ 542 struct afs_server_entry { 543 struct afs_server *server; 544 }; 545 546 struct afs_server_list { 547 afs_volid_t vids[AFS_MAXTYPES]; /* Volume IDs */ 548 refcount_t usage; 549 unsigned char nr_servers; 550 unsigned char preferred; /* Preferred server */ 551 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 552 unsigned int seq; /* Set to ->servers_seq when installed */ 553 rwlock_t lock; 554 struct afs_server_entry servers[]; 555 }; 556 557 /* 558 * Live AFS volume management. 559 */ 560 struct afs_volume { 561 union { 562 struct rcu_head rcu; 563 afs_volid_t vid; /* volume ID */ 564 }; 565 atomic_t usage; 566 time64_t update_at; /* Time at which to next update */ 567 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 568 struct rb_node cell_node; /* Link in cell->volumes */ 569 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 570 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 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 #define AFS_VOLUME_MAYBE_NO_IBULK 6 /* - T if some servers don't have InlineBulkStatus */ 579 #ifdef CONFIG_AFS_FSCACHE 580 struct fscache_cookie *cache; /* caching cookie */ 581 #endif 582 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 583 rwlock_t servers_lock; /* Lock for ->servers */ 584 unsigned int servers_seq; /* Incremented each time ->servers changes */ 585 586 unsigned cb_v_break; /* Break-everything counter. */ 587 rwlock_t cb_v_break_lock; 588 589 afs_voltype_t type; /* type of volume */ 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 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 604 }; 605 606 /* 607 * AFS inode private data. 608 * 609 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 610 * leak from one inode to another. 611 */ 612 struct afs_vnode { 613 struct inode vfs_inode; /* the VFS's inode record */ 614 615 struct afs_volume *volume; /* volume on which vnode resides */ 616 struct afs_fid fid; /* the file identifier for this inode */ 617 struct afs_file_status status; /* AFS status info for this file */ 618 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 619 #ifdef CONFIG_AFS_FSCACHE 620 struct fscache_cookie *cache; /* caching cookie */ 621 #endif 622 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 623 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 624 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 625 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 626 struct key *silly_key; /* Silly rename key */ 627 spinlock_t wb_lock; /* lock for wb_keys */ 628 spinlock_t lock; /* waitqueue/flags lock */ 629 unsigned long flags; 630 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 631 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 632 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 633 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 634 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 635 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 636 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 637 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 638 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 639 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */ 640 641 struct list_head wb_keys; /* List of keys available for writeback */ 642 struct list_head pending_locks; /* locks waiting to be granted */ 643 struct list_head granted_locks; /* locks granted on this file */ 644 struct delayed_work lock_work; /* work to be done in locking */ 645 struct key *lock_key; /* Key to be used in lock ops */ 646 ktime_t locked_at; /* Time at which lock obtained */ 647 enum afs_lock_state lock_state : 8; 648 afs_lock_type_t lock_type : 8; 649 650 /* outstanding callback notification on this file */ 651 void *cb_server; /* Server with callback/filelock */ 652 unsigned int cb_s_break; /* Mass break counter on ->server */ 653 unsigned int cb_v_break; /* Mass break counter on ->volume */ 654 unsigned int cb_break; /* Break counter on vnode */ 655 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 656 657 time64_t cb_expires_at; /* time at which callback expires */ 658 }; 659 660 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 661 { 662 #ifdef CONFIG_AFS_FSCACHE 663 return vnode->cache; 664 #else 665 return NULL; 666 #endif 667 } 668 669 /* 670 * cached security record for one user's attempt to access a vnode 671 */ 672 struct afs_permit { 673 struct key *key; /* RxRPC ticket holding a security context */ 674 afs_access_t access; /* CallerAccess value for this key */ 675 }; 676 677 /* 678 * Immutable cache of CallerAccess records from attempts to access vnodes. 679 * These may be shared between multiple vnodes. 680 */ 681 struct afs_permits { 682 struct rcu_head rcu; 683 struct hlist_node hash_node; /* Link in hash */ 684 unsigned long h; /* Hash value for this permit list */ 685 refcount_t usage; 686 unsigned short nr_permits; /* Number of records */ 687 bool invalidated; /* Invalidated due to key change */ 688 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 689 }; 690 691 /* 692 * Error prioritisation and accumulation. 693 */ 694 struct afs_error { 695 short error; /* Accumulated error */ 696 bool responded; /* T if server responded */ 697 }; 698 699 /* 700 * Cursor for iterating over a server's address list. 701 */ 702 struct afs_addr_cursor { 703 struct afs_addr_list *alist; /* Current address list (pins ref) */ 704 unsigned long tried; /* Tried addresses */ 705 signed char index; /* Current address */ 706 bool responded; /* T if the current address responded */ 707 unsigned short nr_iterations; /* Number of address iterations */ 708 short error; 709 u32 abort_code; 710 }; 711 712 /* 713 * Cursor for iterating over a set of volume location servers. 714 */ 715 struct afs_vl_cursor { 716 struct afs_addr_cursor ac; 717 struct afs_cell *cell; /* The cell we're querying */ 718 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 719 struct afs_vlserver *server; /* Server on which this resides */ 720 struct key *key; /* Key for the server */ 721 unsigned long untried; /* Bitmask of untried servers */ 722 short index; /* Current server */ 723 short error; 724 unsigned short flags; 725 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 726 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 727 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 728 unsigned short nr_iterations; /* Number of server iterations */ 729 }; 730 731 /* 732 * Fileserver operation methods. 733 */ 734 struct afs_operation_ops { 735 void (*issue_afs_rpc)(struct afs_operation *op); 736 void (*issue_yfs_rpc)(struct afs_operation *op); 737 void (*success)(struct afs_operation *op); 738 void (*aborted)(struct afs_operation *op); 739 void (*edit_dir)(struct afs_operation *op); 740 void (*put)(struct afs_operation *op); 741 }; 742 743 struct afs_vnode_param { 744 struct afs_vnode *vnode; 745 struct afs_fid fid; /* Fid to access */ 746 struct afs_status_cb scb; /* Returned status and callback promise */ 747 afs_dataversion_t dv_before; /* Data version before the call */ 748 unsigned int cb_break_before; /* cb_break + cb_s_break before the call */ 749 u8 dv_delta; /* Expected change in data version */ 750 bool put_vnode:1; /* T if we have a ref on the vnode */ 751 bool need_io_lock:1; /* T if we need the I/O lock on this */ 752 bool update_ctime:1; /* Need to update the ctime */ 753 bool set_size:1; /* Must update i_size */ 754 bool op_unlinked:1; /* True if file was unlinked by op */ 755 }; 756 757 /* 758 * Fileserver operation wrapper, handling server and address rotation 759 * asynchronously. May make simultaneous calls to multiple servers. 760 */ 761 struct afs_operation { 762 struct afs_net *net; /* Network namespace */ 763 struct key *key; /* Key for the cell */ 764 const struct afs_call_type *type; /* Type of call done */ 765 const struct afs_operation_ops *ops; 766 767 /* Parameters/results for the operation */ 768 struct afs_volume *volume; /* Volume being accessed */ 769 struct afs_vnode_param file[2]; 770 struct afs_vnode_param *more_files; 771 struct afs_volsync volsync; 772 struct dentry *dentry; /* Dentry to be altered */ 773 struct dentry *dentry_2; /* Second dentry to be altered */ 774 struct timespec64 mtime; /* Modification time to record */ 775 struct timespec64 ctime; /* Change time to set */ 776 short nr_files; /* Number of entries in file[], more_files */ 777 short error; 778 unsigned int debug_id; 779 780 unsigned int cb_v_break; /* Volume break counter before op */ 781 unsigned int cb_s_break; /* Server break counter before op */ 782 783 union { 784 struct { 785 int which; /* Which ->file[] to fetch for */ 786 } fetch_status; 787 struct { 788 int reason; /* enum afs_edit_dir_reason */ 789 mode_t mode; 790 const char *symlink; 791 } create; 792 struct { 793 bool need_rehash; 794 } unlink; 795 struct { 796 struct dentry *rehash; 797 struct dentry *tmp; 798 bool new_negative; 799 } rename; 800 struct { 801 struct afs_read *req; 802 } fetch; 803 struct { 804 afs_lock_type_t type; 805 } lock; 806 struct { 807 struct address_space *mapping; /* Pages being written from */ 808 pgoff_t first; /* first page in mapping to deal with */ 809 pgoff_t last; /* last page in mapping to deal with */ 810 unsigned first_offset; /* offset into mapping[first] */ 811 unsigned last_to; /* amount of mapping[last] */ 812 } store; 813 struct { 814 struct iattr *attr; 815 } setattr; 816 struct afs_acl *acl; 817 struct yfs_acl *yacl; 818 struct { 819 struct afs_volume_status vs; 820 struct kstatfs *buf; 821 } volstatus; 822 }; 823 824 /* Fileserver iteration state */ 825 struct afs_addr_cursor ac; 826 struct afs_server_list *server_list; /* Current server list (pins ref) */ 827 struct afs_server *server; /* Server we're using (ref pinned by server_list) */ 828 struct afs_call *call; 829 unsigned long untried; /* Bitmask of untried servers */ 830 short index; /* Current server */ 831 unsigned short nr_iterations; /* Number of server iterations */ 832 833 unsigned int flags; 834 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */ 835 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */ 836 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */ 837 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */ 838 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 839 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 840 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */ 841 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */ 842 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */ 843 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */ 844 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */ 845 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */ 846 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */ 847 }; 848 849 /* 850 * Cache auxiliary data. 851 */ 852 struct afs_vnode_cache_aux { 853 u64 data_version; 854 } __packed; 855 856 #include <trace/events/afs.h> 857 858 /*****************************************************************************/ 859 /* 860 * addr_list.c 861 */ 862 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 863 { 864 if (alist) 865 refcount_inc(&alist->usage); 866 return alist; 867 } 868 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 869 unsigned short, 870 unsigned short); 871 extern void afs_put_addrlist(struct afs_addr_list *); 872 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 873 const char *, size_t, char, 874 unsigned short, unsigned short); 875 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 876 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 877 extern int afs_end_cursor(struct afs_addr_cursor *); 878 879 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 880 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 881 882 /* 883 * cache.c 884 */ 885 #ifdef CONFIG_AFS_FSCACHE 886 extern struct fscache_netfs afs_cache_netfs; 887 extern struct fscache_cookie_def afs_cell_cache_index_def; 888 extern struct fscache_cookie_def afs_volume_cache_index_def; 889 extern struct fscache_cookie_def afs_vnode_cache_index_def; 890 #else 891 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 892 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 893 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 894 #endif 895 896 /* 897 * callback.c 898 */ 899 extern void afs_init_callback_state(struct afs_server *); 900 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 901 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 902 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 903 904 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 905 { 906 return vnode->cb_break + vnode->cb_v_break; 907 } 908 909 static inline bool afs_cb_is_broken(unsigned int cb_break, 910 const struct afs_vnode *vnode) 911 { 912 return cb_break != (vnode->cb_break + vnode->volume->cb_v_break); 913 } 914 915 /* 916 * cell.c 917 */ 918 extern int afs_cell_init(struct afs_net *, const char *); 919 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 920 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 921 const char *, bool); 922 extern struct afs_cell *afs_get_cell(struct afs_cell *); 923 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 924 extern void afs_manage_cells(struct work_struct *); 925 extern void afs_cells_timer(struct timer_list *); 926 extern void __net_exit afs_cell_purge(struct afs_net *); 927 928 /* 929 * cmservice.c 930 */ 931 extern bool afs_cm_incoming_call(struct afs_call *); 932 933 /* 934 * dir.c 935 */ 936 extern const struct file_operations afs_dir_file_operations; 937 extern const struct inode_operations afs_dir_inode_operations; 938 extern const struct address_space_operations afs_dir_aops; 939 extern const struct dentry_operations afs_fs_dentry_operations; 940 941 extern void afs_d_release(struct dentry *); 942 extern void afs_check_for_remote_deletion(struct afs_operation *); 943 944 /* 945 * dir_edit.c 946 */ 947 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 948 enum afs_edit_dir_reason); 949 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 950 951 /* 952 * dir_silly.c 953 */ 954 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 955 struct dentry *, struct key *); 956 extern int afs_silly_iput(struct dentry *, struct inode *); 957 958 /* 959 * dynroot.c 960 */ 961 extern const struct inode_operations afs_dynroot_inode_operations; 962 extern const struct dentry_operations afs_dynroot_dentry_operations; 963 964 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 965 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 966 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 967 extern int afs_dynroot_populate(struct super_block *); 968 extern void afs_dynroot_depopulate(struct super_block *); 969 970 /* 971 * file.c 972 */ 973 extern const struct address_space_operations afs_fs_aops; 974 extern const struct inode_operations afs_file_inode_operations; 975 extern const struct file_operations afs_file_operations; 976 977 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 978 extern void afs_put_wb_key(struct afs_wb_key *); 979 extern int afs_open(struct inode *, struct file *); 980 extern int afs_release(struct inode *, struct file *); 981 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 982 extern int afs_page_filler(void *, struct page *); 983 extern void afs_put_read(struct afs_read *); 984 985 static inline struct afs_read *afs_get_read(struct afs_read *req) 986 { 987 refcount_inc(&req->usage); 988 return req; 989 } 990 991 /* 992 * flock.c 993 */ 994 extern struct workqueue_struct *afs_lock_manager; 995 996 extern void afs_lock_op_done(struct afs_call *); 997 extern void afs_lock_work(struct work_struct *); 998 extern void afs_lock_may_be_available(struct afs_vnode *); 999 extern int afs_lock(struct file *, int, struct file_lock *); 1000 extern int afs_flock(struct file *, int, struct file_lock *); 1001 1002 /* 1003 * fsclient.c 1004 */ 1005 extern void afs_fs_fetch_status(struct afs_operation *); 1006 extern void afs_fs_fetch_data(struct afs_operation *); 1007 extern void afs_fs_create_file(struct afs_operation *); 1008 extern void afs_fs_make_dir(struct afs_operation *); 1009 extern void afs_fs_remove_file(struct afs_operation *); 1010 extern void afs_fs_remove_dir(struct afs_operation *); 1011 extern void afs_fs_link(struct afs_operation *); 1012 extern void afs_fs_symlink(struct afs_operation *); 1013 extern void afs_fs_rename(struct afs_operation *); 1014 extern void afs_fs_store_data(struct afs_operation *); 1015 extern void afs_fs_setattr(struct afs_operation *); 1016 extern void afs_fs_get_volume_status(struct afs_operation *); 1017 extern void afs_fs_set_lock(struct afs_operation *); 1018 extern void afs_fs_extend_lock(struct afs_operation *); 1019 extern void afs_fs_release_lock(struct afs_operation *); 1020 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 1021 struct afs_addr_cursor *, struct key *); 1022 extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 1023 struct afs_addr_cursor *, struct key *); 1024 extern void afs_fs_inline_bulk_status(struct afs_operation *); 1025 1026 struct afs_acl { 1027 u32 size; 1028 u8 data[]; 1029 }; 1030 1031 extern void afs_fs_fetch_acl(struct afs_operation *); 1032 extern void afs_fs_store_acl(struct afs_operation *); 1033 1034 /* 1035 * fs_operation.c 1036 */ 1037 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *); 1038 extern int afs_put_operation(struct afs_operation *); 1039 extern bool afs_begin_vnode_operation(struct afs_operation *); 1040 extern void afs_wait_for_operation(struct afs_operation *); 1041 extern int afs_do_sync_operation(struct afs_operation *); 1042 1043 static inline void afs_op_nomem(struct afs_operation *op) 1044 { 1045 op->error = -ENOMEM; 1046 } 1047 1048 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1049 struct afs_vnode *vnode) 1050 { 1051 op->file[n].vnode = vnode; 1052 op->file[n].need_io_lock = true; 1053 } 1054 1055 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1056 const struct afs_fid *fid) 1057 { 1058 op->file[n].fid = *fid; 1059 } 1060 1061 /* 1062 * fs_probe.c 1063 */ 1064 extern void afs_fileserver_probe_result(struct afs_call *); 1065 extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool); 1066 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 1067 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1068 extern void afs_fs_probe_dispatcher(struct work_struct *); 1069 extern int afs_wait_for_one_fs_probe(struct afs_server *, bool); 1070 extern void afs_fs_probe_cleanup(struct afs_net *); 1071 1072 /* 1073 * inode.c 1074 */ 1075 extern const struct afs_operation_ops afs_fetch_status_operation; 1076 1077 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1078 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1079 extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1080 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1081 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *); 1082 extern struct inode *afs_root_iget(struct super_block *, struct key *); 1083 extern bool afs_check_validity(struct afs_vnode *); 1084 extern int afs_validate(struct afs_vnode *, struct key *); 1085 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1086 extern int afs_setattr(struct dentry *, struct iattr *); 1087 extern void afs_evict_inode(struct inode *); 1088 extern int afs_drop_inode(struct inode *); 1089 1090 /* 1091 * main.c 1092 */ 1093 extern struct workqueue_struct *afs_wq; 1094 extern int afs_net_id; 1095 1096 static inline struct afs_net *afs_net(struct net *net) 1097 { 1098 return net_generic(net, afs_net_id); 1099 } 1100 1101 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1102 { 1103 return afs_net(AFS_FS_S(sb)->net_ns); 1104 } 1105 1106 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1107 { 1108 return afs_sb2net(dentry->d_sb); 1109 } 1110 1111 static inline struct afs_net *afs_i2net(struct inode *inode) 1112 { 1113 return afs_sb2net(inode->i_sb); 1114 } 1115 1116 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1117 { 1118 return afs_i2net(&vnode->vfs_inode); 1119 } 1120 1121 static inline struct afs_net *afs_sock2net(struct sock *sk) 1122 { 1123 return net_generic(sock_net(sk), afs_net_id); 1124 } 1125 1126 static inline void __afs_stat(atomic_t *s) 1127 { 1128 atomic_inc(s); 1129 } 1130 1131 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1132 1133 /* 1134 * misc.c 1135 */ 1136 extern int afs_abort_to_error(u32); 1137 extern void afs_prioritise_error(struct afs_error *, int, u32); 1138 1139 /* 1140 * mntpt.c 1141 */ 1142 extern const struct inode_operations afs_mntpt_inode_operations; 1143 extern const struct inode_operations afs_autocell_inode_operations; 1144 extern const struct file_operations afs_mntpt_file_operations; 1145 1146 extern struct vfsmount *afs_d_automount(struct path *); 1147 extern void afs_mntpt_kill_timer(void); 1148 1149 /* 1150 * proc.c 1151 */ 1152 #ifdef CONFIG_PROC_FS 1153 extern int __net_init afs_proc_init(struct afs_net *); 1154 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1155 extern int afs_proc_cell_setup(struct afs_cell *); 1156 extern void afs_proc_cell_remove(struct afs_cell *); 1157 extern void afs_put_sysnames(struct afs_sysnames *); 1158 #else 1159 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1160 static inline void afs_proc_cleanup(struct afs_net *net) {} 1161 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1162 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1163 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1164 #endif 1165 1166 /* 1167 * rotate.c 1168 */ 1169 extern bool afs_select_fileserver(struct afs_operation *); 1170 extern void afs_dump_edestaddrreq(const struct afs_operation *); 1171 1172 /* 1173 * rxrpc.c 1174 */ 1175 extern struct workqueue_struct *afs_async_calls; 1176 1177 extern int __net_init afs_open_socket(struct afs_net *); 1178 extern void __net_exit afs_close_socket(struct afs_net *); 1179 extern void afs_charge_preallocation(struct work_struct *); 1180 extern void afs_put_call(struct afs_call *); 1181 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1182 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1183 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1184 const struct afs_call_type *, 1185 size_t, size_t); 1186 extern void afs_flat_call_destructor(struct afs_call *); 1187 extern void afs_send_empty_reply(struct afs_call *); 1188 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1189 extern int afs_extract_data(struct afs_call *, bool); 1190 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause); 1191 1192 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1193 gfp_t gfp) 1194 { 1195 op->call = call; 1196 op->type = call->type; 1197 call->op = op; 1198 call->key = op->key; 1199 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1200 afs_make_call(&op->ac, call, gfp); 1201 } 1202 1203 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1204 { 1205 call->kvec[0].iov_base = buf; 1206 call->kvec[0].iov_len = size; 1207 iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size); 1208 } 1209 1210 static inline void afs_extract_to_tmp(struct afs_call *call) 1211 { 1212 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1213 } 1214 1215 static inline void afs_extract_to_tmp64(struct afs_call *call) 1216 { 1217 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1218 } 1219 1220 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1221 { 1222 iov_iter_discard(&call->def_iter, READ, size); 1223 } 1224 1225 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1226 { 1227 afs_extract_begin(call, call->buffer, size); 1228 } 1229 1230 static inline int afs_transfer_reply(struct afs_call *call) 1231 { 1232 return afs_extract_data(call, false); 1233 } 1234 1235 static inline bool afs_check_call_state(struct afs_call *call, 1236 enum afs_call_state state) 1237 { 1238 return READ_ONCE(call->state) == state; 1239 } 1240 1241 static inline bool afs_set_call_state(struct afs_call *call, 1242 enum afs_call_state from, 1243 enum afs_call_state to) 1244 { 1245 bool ok = false; 1246 1247 spin_lock_bh(&call->state_lock); 1248 if (call->state == from) { 1249 call->state = to; 1250 trace_afs_call_state(call, from, to, 0, 0); 1251 ok = true; 1252 } 1253 spin_unlock_bh(&call->state_lock); 1254 return ok; 1255 } 1256 1257 static inline void afs_set_call_complete(struct afs_call *call, 1258 int error, u32 remote_abort) 1259 { 1260 enum afs_call_state state; 1261 bool ok = false; 1262 1263 spin_lock_bh(&call->state_lock); 1264 state = call->state; 1265 if (state != AFS_CALL_COMPLETE) { 1266 call->abort_code = remote_abort; 1267 call->error = error; 1268 call->state = AFS_CALL_COMPLETE; 1269 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1270 error, remote_abort); 1271 ok = true; 1272 } 1273 spin_unlock_bh(&call->state_lock); 1274 if (ok) { 1275 trace_afs_call_done(call); 1276 1277 /* Asynchronous calls have two refs to release - one from the alloc and 1278 * one queued with the work item - and we can't just deallocate the 1279 * call because the work item may be queued again. 1280 */ 1281 if (call->drop_ref) 1282 afs_put_call(call); 1283 } 1284 } 1285 1286 /* 1287 * security.c 1288 */ 1289 extern void afs_put_permits(struct afs_permits *); 1290 extern void afs_clear_permits(struct afs_vnode *); 1291 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1292 struct afs_status_cb *); 1293 extern void afs_zap_permits(struct rcu_head *); 1294 extern struct key *afs_request_key(struct afs_cell *); 1295 extern struct key *afs_request_key_rcu(struct afs_cell *); 1296 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1297 extern int afs_permission(struct inode *, int); 1298 extern void __exit afs_clean_up_permit_cache(void); 1299 1300 /* 1301 * server.c 1302 */ 1303 extern spinlock_t afs_server_peer_lock; 1304 1305 extern struct afs_server *afs_find_server(struct afs_net *, 1306 const struct sockaddr_rxrpc *); 1307 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1308 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1309 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1310 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace); 1311 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1312 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace); 1313 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1314 extern void afs_manage_servers(struct work_struct *); 1315 extern void afs_servers_timer(struct timer_list *); 1316 extern void afs_fs_probe_timer(struct timer_list *); 1317 extern void __net_exit afs_purge_servers(struct afs_net *); 1318 extern bool afs_check_server_record(struct afs_operation *, struct afs_server *); 1319 1320 static inline void afs_inc_servers_outstanding(struct afs_net *net) 1321 { 1322 atomic_inc(&net->servers_outstanding); 1323 } 1324 1325 static inline void afs_dec_servers_outstanding(struct afs_net *net) 1326 { 1327 if (atomic_dec_and_test(&net->servers_outstanding)) 1328 wake_up_var(&net->servers_outstanding); 1329 } 1330 1331 static inline bool afs_is_probing_server(struct afs_server *server) 1332 { 1333 return list_empty(&server->probe_link); 1334 } 1335 1336 /* 1337 * server_list.c 1338 */ 1339 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1340 { 1341 refcount_inc(&slist->usage); 1342 return slist; 1343 } 1344 1345 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1346 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1347 struct afs_vldb_entry *, 1348 u8); 1349 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1350 1351 /* 1352 * super.c 1353 */ 1354 extern int __init afs_fs_init(void); 1355 extern void afs_fs_exit(void); 1356 1357 /* 1358 * vlclient.c 1359 */ 1360 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1361 const char *, int); 1362 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1363 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1364 struct key *, struct afs_vlserver *, unsigned int); 1365 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1366 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1367 1368 /* 1369 * vl_alias.c 1370 */ 1371 extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1372 1373 /* 1374 * vl_probe.c 1375 */ 1376 extern void afs_vlserver_probe_result(struct afs_call *); 1377 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1378 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1379 1380 /* 1381 * vl_rotate.c 1382 */ 1383 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1384 struct afs_cell *, struct key *); 1385 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1386 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1387 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1388 1389 /* 1390 * vlserver_list.c 1391 */ 1392 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1393 { 1394 atomic_inc(&vlserver->usage); 1395 return vlserver; 1396 } 1397 1398 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1399 { 1400 if (vllist) 1401 atomic_inc(&vllist->usage); 1402 return vllist; 1403 } 1404 1405 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1406 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1407 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1408 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1409 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1410 const void *, size_t); 1411 1412 /* 1413 * volume.c 1414 */ 1415 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1416 extern void afs_activate_volume(struct afs_volume *); 1417 extern void afs_deactivate_volume(struct afs_volume *); 1418 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1419 extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace); 1420 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1421 1422 /* 1423 * write.c 1424 */ 1425 extern int afs_set_page_dirty(struct page *); 1426 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1427 loff_t pos, unsigned len, unsigned flags, 1428 struct page **pagep, void **fsdata); 1429 extern int afs_write_end(struct file *file, struct address_space *mapping, 1430 loff_t pos, unsigned len, unsigned copied, 1431 struct page *page, void *fsdata); 1432 extern int afs_writepage(struct page *, struct writeback_control *); 1433 extern int afs_writepages(struct address_space *, struct writeback_control *); 1434 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1435 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1436 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1437 extern void afs_prune_wb_keys(struct afs_vnode *); 1438 extern int afs_launder_page(struct page *); 1439 1440 /* 1441 * xattr.c 1442 */ 1443 extern const struct xattr_handler *afs_xattr_handlers[]; 1444 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1445 1446 /* 1447 * yfsclient.c 1448 */ 1449 extern void yfs_fs_fetch_data(struct afs_operation *); 1450 extern void yfs_fs_create_file(struct afs_operation *); 1451 extern void yfs_fs_make_dir(struct afs_operation *); 1452 extern void yfs_fs_remove_file2(struct afs_operation *); 1453 extern void yfs_fs_remove_file(struct afs_operation *); 1454 extern void yfs_fs_remove_dir(struct afs_operation *); 1455 extern void yfs_fs_link(struct afs_operation *); 1456 extern void yfs_fs_symlink(struct afs_operation *); 1457 extern void yfs_fs_rename(struct afs_operation *); 1458 extern void yfs_fs_store_data(struct afs_operation *); 1459 extern void yfs_fs_setattr(struct afs_operation *); 1460 extern void yfs_fs_get_volume_status(struct afs_operation *); 1461 extern void yfs_fs_set_lock(struct afs_operation *); 1462 extern void yfs_fs_extend_lock(struct afs_operation *); 1463 extern void yfs_fs_release_lock(struct afs_operation *); 1464 extern void yfs_fs_fetch_status(struct afs_operation *); 1465 extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1466 1467 struct yfs_acl { 1468 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1469 struct afs_acl *vol_acl; /* Whole volume ACL */ 1470 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1471 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1472 unsigned int flags; 1473 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1474 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1475 }; 1476 1477 extern void yfs_free_opaque_acl(struct yfs_acl *); 1478 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1479 extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1480 1481 /* 1482 * Miscellaneous inline functions. 1483 */ 1484 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1485 { 1486 return container_of(inode, struct afs_vnode, vfs_inode); 1487 } 1488 1489 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1490 { 1491 return &vnode->vfs_inode; 1492 } 1493 1494 /* 1495 * Note that a dentry got changed. We need to set d_fsdata to the data version 1496 * number derived from the result of the operation. It doesn't matter if 1497 * d_fsdata goes backwards as we'll just revalidate. 1498 */ 1499 static inline void afs_update_dentry_version(struct afs_operation *op, 1500 struct afs_vnode_param *dir_vp, 1501 struct dentry *dentry) 1502 { 1503 if (!op->error) 1504 dentry->d_fsdata = 1505 (void *)(unsigned long)dir_vp->scb.status.data_version; 1506 } 1507 1508 /* 1509 * Check for a conflicting operation on a directory that we just unlinked from. 1510 * If someone managed to sneak a link or an unlink in on the file we just 1511 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS). 1512 */ 1513 static inline void afs_check_dir_conflict(struct afs_operation *op, 1514 struct afs_vnode_param *dvp) 1515 { 1516 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version) 1517 op->flags |= AFS_OPERATION_DIR_CONFLICT; 1518 } 1519 1520 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1521 { 1522 trace_afs_io_error(call->debug_id, -EIO, where); 1523 return -EIO; 1524 } 1525 1526 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1527 { 1528 trace_afs_file_error(vnode, -EIO, where); 1529 return -EIO; 1530 } 1531 1532 /*****************************************************************************/ 1533 /* 1534 * debug tracing 1535 */ 1536 extern unsigned afs_debug; 1537 1538 #define dbgprintk(FMT,...) \ 1539 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1540 1541 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1542 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1543 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1544 1545 1546 #if defined(__KDEBUG) 1547 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1548 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1549 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1550 1551 #elif defined(CONFIG_AFS_DEBUG) 1552 #define AFS_DEBUG_KENTER 0x01 1553 #define AFS_DEBUG_KLEAVE 0x02 1554 #define AFS_DEBUG_KDEBUG 0x04 1555 1556 #define _enter(FMT,...) \ 1557 do { \ 1558 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1559 kenter(FMT,##__VA_ARGS__); \ 1560 } while (0) 1561 1562 #define _leave(FMT,...) \ 1563 do { \ 1564 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1565 kleave(FMT,##__VA_ARGS__); \ 1566 } while (0) 1567 1568 #define _debug(FMT,...) \ 1569 do { \ 1570 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1571 kdebug(FMT,##__VA_ARGS__); \ 1572 } while (0) 1573 1574 #else 1575 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1576 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1577 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1578 #endif 1579 1580 /* 1581 * debug assertion checking 1582 */ 1583 #if 1 // defined(__KDEBUGALL) 1584 1585 #define ASSERT(X) \ 1586 do { \ 1587 if (unlikely(!(X))) { \ 1588 printk(KERN_ERR "\n"); \ 1589 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1590 BUG(); \ 1591 } \ 1592 } while(0) 1593 1594 #define ASSERTCMP(X, OP, Y) \ 1595 do { \ 1596 if (unlikely(!((X) OP (Y)))) { \ 1597 printk(KERN_ERR "\n"); \ 1598 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1599 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1600 (unsigned long)(X), (unsigned long)(Y)); \ 1601 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1602 (unsigned long)(X), (unsigned long)(Y)); \ 1603 BUG(); \ 1604 } \ 1605 } while(0) 1606 1607 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1608 do { \ 1609 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1610 printk(KERN_ERR "\n"); \ 1611 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1612 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1613 (unsigned long)(L), (unsigned long)(N), \ 1614 (unsigned long)(H)); \ 1615 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1616 (unsigned long)(L), (unsigned long)(N), \ 1617 (unsigned long)(H)); \ 1618 BUG(); \ 1619 } \ 1620 } while(0) 1621 1622 #define ASSERTIF(C, X) \ 1623 do { \ 1624 if (unlikely((C) && !(X))) { \ 1625 printk(KERN_ERR "\n"); \ 1626 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1627 BUG(); \ 1628 } \ 1629 } while(0) 1630 1631 #define ASSERTIFCMP(C, X, OP, Y) \ 1632 do { \ 1633 if (unlikely((C) && !((X) OP (Y)))) { \ 1634 printk(KERN_ERR "\n"); \ 1635 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1636 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1637 (unsigned long)(X), (unsigned long)(Y)); \ 1638 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1639 (unsigned long)(X), (unsigned long)(Y)); \ 1640 BUG(); \ 1641 } \ 1642 } while(0) 1643 1644 #else 1645 1646 #define ASSERT(X) \ 1647 do { \ 1648 } while(0) 1649 1650 #define ASSERTCMP(X, OP, Y) \ 1651 do { \ 1652 } while(0) 1653 1654 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1655 do { \ 1656 } while(0) 1657 1658 #define ASSERTIF(C, X) \ 1659 do { \ 1660 } while(0) 1661 1662 #define ASSERTIFCMP(C, X, OP, Y) \ 1663 do { \ 1664 } while(0) 1665 1666 #endif /* __KDEBUGALL */ 1667