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 *ws_cell; 267 struct work_struct cells_manager; 268 struct timer_list cells_timer; 269 atomic_t cells_outstanding; 270 struct rw_semaphore 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 AFS_CELL_REMOVED, 330 }; 331 332 /* 333 * AFS cell record. 334 * 335 * This is a tricky concept to get right as it is possible to create aliases 336 * simply by pointing AFSDB/SRV records for two names at the same set of VL 337 * servers; it is also possible to do things like setting up two sets of VL 338 * servers, one of which provides a superset of the volumes provided by the 339 * other (for internal/external division, for example). 340 * 341 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 342 * servers and (b) a cell's name is used by the client to select the key to use 343 * for authentication and encryption. The cell name is not typically used in 344 * the protocol. 345 * 346 * Two cells are determined to be aliases if they have an explicit alias (YFS 347 * only), share any VL servers in common or have at least one volume in common. 348 * "In common" means that the address list of the VL servers or the fileservers 349 * share at least one endpoint. 350 */ 351 struct afs_cell { 352 union { 353 struct rcu_head rcu; 354 struct rb_node net_node; /* Node in net->cells */ 355 }; 356 struct afs_net *net; 357 struct afs_cell *alias_of; /* The cell this is an alias of */ 358 struct afs_volume *root_volume; /* The root.cell volume if there is one */ 359 struct key *anonymous_key; /* anonymous user key for this cell */ 360 struct work_struct manager; /* Manager for init/deinit/dns */ 361 struct hlist_node proc_link; /* /proc cell list link */ 362 #ifdef CONFIG_AFS_FSCACHE 363 struct fscache_cookie *cache; /* caching cookie */ 364 #endif 365 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 366 time64_t last_inactive; /* Time of last drop of usage count */ 367 atomic_t ref; /* Struct refcount */ 368 atomic_t active; /* Active usage counter */ 369 unsigned long flags; 370 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 371 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 372 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */ 373 enum afs_cell_state state; 374 short error; 375 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 376 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 377 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 378 unsigned int debug_id; 379 380 /* The volumes belonging to this cell */ 381 struct rb_root volumes; /* Tree of volumes on this server */ 382 struct hlist_head proc_volumes; /* procfs volume list */ 383 seqlock_t volume_lock; /* For volumes */ 384 385 /* Active fileserver interaction state. */ 386 struct rb_root fs_servers; /* afs_server (by server UUID) */ 387 seqlock_t fs_lock; /* For fs_servers */ 388 389 /* VL server list. */ 390 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 391 struct afs_vlserver_list __rcu *vl_servers; 392 393 u8 name_len; /* Length of name */ 394 char *name; /* Cell name, case-flattened and NUL-padded */ 395 }; 396 397 /* 398 * Volume Location server record. 399 */ 400 struct afs_vlserver { 401 struct rcu_head rcu; 402 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 403 unsigned long flags; 404 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 405 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 406 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 407 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */ 408 rwlock_t lock; /* Lock on addresses */ 409 atomic_t usage; 410 unsigned int rtt; /* Server's current RTT in uS */ 411 412 /* Probe state */ 413 wait_queue_head_t probe_wq; 414 atomic_t probe_outstanding; 415 spinlock_t probe_lock; 416 struct { 417 unsigned int rtt; /* RTT in uS */ 418 u32 abort_code; 419 short error; 420 unsigned short flags; 421 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */ 422 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */ 423 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */ 424 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */ 425 } probe; 426 427 u16 port; 428 u16 name_len; /* Length of name */ 429 char name[]; /* Server name, case-flattened */ 430 }; 431 432 /* 433 * Weighted list of Volume Location servers. 434 */ 435 struct afs_vlserver_entry { 436 u16 priority; /* Preference (as SRV) */ 437 u16 weight; /* Weight (as SRV) */ 438 enum dns_record_source source:8; 439 enum dns_lookup_status status:8; 440 struct afs_vlserver *server; 441 }; 442 443 struct afs_vlserver_list { 444 struct rcu_head rcu; 445 atomic_t usage; 446 u8 nr_servers; 447 u8 index; /* Server currently in use */ 448 u8 preferred; /* Preferred server */ 449 enum dns_record_source source:8; 450 enum dns_lookup_status status:8; 451 rwlock_t lock; 452 struct afs_vlserver_entry servers[]; 453 }; 454 455 /* 456 * Cached VLDB entry. 457 * 458 * This is pointed to by cell->vldb_entries, indexed by name. 459 */ 460 struct afs_vldb_entry { 461 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 462 463 unsigned long flags; 464 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 465 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 466 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 467 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 468 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 469 470 uuid_t fs_server[AFS_NMAXNSERVERS]; 471 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */ 472 u8 fs_mask[AFS_NMAXNSERVERS]; 473 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 474 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 475 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 476 short error; 477 u8 nr_servers; /* Number of server records */ 478 u8 name_len; 479 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 480 }; 481 482 /* 483 * Record of fileserver with which we're actively communicating. 484 */ 485 struct afs_server { 486 struct rcu_head rcu; 487 union { 488 uuid_t uuid; /* Server ID */ 489 struct afs_uuid _uuid; 490 }; 491 492 struct afs_addr_list __rcu *addresses; 493 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 494 struct rb_node uuid_rb; /* Link in net->fs_servers */ 495 struct afs_server __rcu *uuid_next; /* Next server with same UUID */ 496 struct afs_server *uuid_prev; /* Previous server with same UUID */ 497 struct list_head probe_link; /* Link in net->fs_probe_list */ 498 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 499 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 500 struct hlist_node proc_link; /* Link in net->fs_proc */ 501 struct afs_server *gc_next; /* Next server in manager's list */ 502 time64_t unuse_time; /* Time at which last unused */ 503 unsigned long flags; 504 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 505 #define AFS_SERVER_FL_UPDATING 1 506 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 507 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */ 508 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */ 509 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */ 510 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 511 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 512 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 513 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 514 atomic_t ref; /* Object refcount */ 515 atomic_t active; /* Active user count */ 516 u32 addr_version; /* Address list version */ 517 unsigned int rtt; /* Server's current RTT in uS */ 518 unsigned int debug_id; /* Debugging ID for traces */ 519 520 /* file service access */ 521 rwlock_t fs_lock; /* access lock */ 522 523 /* callback promise management */ 524 unsigned cb_s_break; /* Break-everything counter. */ 525 526 /* Probe state */ 527 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 528 wait_queue_head_t probe_wq; 529 atomic_t probe_outstanding; 530 spinlock_t probe_lock; 531 struct { 532 unsigned int rtt; /* RTT in uS */ 533 u32 abort_code; 534 short error; 535 bool responded:1; 536 bool is_yfs:1; 537 bool not_yfs:1; 538 bool local_failure:1; 539 } probe; 540 }; 541 542 /* 543 * Replaceable volume server list. 544 */ 545 struct afs_server_entry { 546 struct afs_server *server; 547 }; 548 549 struct afs_server_list { 550 afs_volid_t vids[AFS_MAXTYPES]; /* Volume IDs */ 551 refcount_t usage; 552 unsigned char nr_servers; 553 unsigned char preferred; /* Preferred server */ 554 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 555 unsigned int seq; /* Set to ->servers_seq when installed */ 556 rwlock_t lock; 557 struct afs_server_entry servers[]; 558 }; 559 560 /* 561 * Live AFS volume management. 562 */ 563 struct afs_volume { 564 union { 565 struct rcu_head rcu; 566 afs_volid_t vid; /* volume ID */ 567 }; 568 atomic_t usage; 569 time64_t update_at; /* Time at which to next update */ 570 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 571 struct rb_node cell_node; /* Link in cell->volumes */ 572 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 573 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 574 unsigned long flags; 575 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 576 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 577 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 578 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 579 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 580 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 581 #define AFS_VOLUME_MAYBE_NO_IBULK 6 /* - T if some servers don't have InlineBulkStatus */ 582 #ifdef CONFIG_AFS_FSCACHE 583 struct fscache_cookie *cache; /* caching cookie */ 584 #endif 585 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 586 rwlock_t servers_lock; /* Lock for ->servers */ 587 unsigned int servers_seq; /* Incremented each time ->servers changes */ 588 589 unsigned cb_v_break; /* Break-everything counter. */ 590 rwlock_t cb_v_break_lock; 591 592 afs_voltype_t type; /* type of volume */ 593 char type_force; /* force volume type (suppress R/O -> R/W) */ 594 u8 name_len; 595 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 596 }; 597 598 enum afs_lock_state { 599 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 600 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 601 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 602 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 603 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 604 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 605 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 606 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 607 }; 608 609 /* 610 * AFS inode private data. 611 * 612 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 613 * leak from one inode to another. 614 */ 615 struct afs_vnode { 616 struct inode vfs_inode; /* the VFS's inode record */ 617 618 struct afs_volume *volume; /* volume on which vnode resides */ 619 struct afs_fid fid; /* the file identifier for this inode */ 620 struct afs_file_status status; /* AFS status info for this file */ 621 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 622 #ifdef CONFIG_AFS_FSCACHE 623 struct fscache_cookie *cache; /* caching cookie */ 624 #endif 625 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 626 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 627 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 628 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 629 struct key *silly_key; /* Silly rename key */ 630 spinlock_t wb_lock; /* lock for wb_keys */ 631 spinlock_t lock; /* waitqueue/flags lock */ 632 unsigned long flags; 633 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 634 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 635 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 636 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 637 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 638 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 639 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 640 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 641 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 642 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */ 643 644 struct list_head wb_keys; /* List of keys available for writeback */ 645 struct list_head pending_locks; /* locks waiting to be granted */ 646 struct list_head granted_locks; /* locks granted on this file */ 647 struct delayed_work lock_work; /* work to be done in locking */ 648 struct key *lock_key; /* Key to be used in lock ops */ 649 ktime_t locked_at; /* Time at which lock obtained */ 650 enum afs_lock_state lock_state : 8; 651 afs_lock_type_t lock_type : 8; 652 653 /* outstanding callback notification on this file */ 654 void *cb_server; /* Server with callback/filelock */ 655 unsigned int cb_s_break; /* Mass break counter on ->server */ 656 unsigned int cb_v_break; /* Mass break counter on ->volume */ 657 unsigned int cb_break; /* Break counter on vnode */ 658 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 659 660 time64_t cb_expires_at; /* time at which callback expires */ 661 }; 662 663 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 664 { 665 #ifdef CONFIG_AFS_FSCACHE 666 return vnode->cache; 667 #else 668 return NULL; 669 #endif 670 } 671 672 /* 673 * cached security record for one user's attempt to access a vnode 674 */ 675 struct afs_permit { 676 struct key *key; /* RxRPC ticket holding a security context */ 677 afs_access_t access; /* CallerAccess value for this key */ 678 }; 679 680 /* 681 * Immutable cache of CallerAccess records from attempts to access vnodes. 682 * These may be shared between multiple vnodes. 683 */ 684 struct afs_permits { 685 struct rcu_head rcu; 686 struct hlist_node hash_node; /* Link in hash */ 687 unsigned long h; /* Hash value for this permit list */ 688 refcount_t usage; 689 unsigned short nr_permits; /* Number of records */ 690 bool invalidated; /* Invalidated due to key change */ 691 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 692 }; 693 694 /* 695 * Error prioritisation and accumulation. 696 */ 697 struct afs_error { 698 short error; /* Accumulated error */ 699 bool responded; /* T if server responded */ 700 }; 701 702 /* 703 * Cursor for iterating over a server's address list. 704 */ 705 struct afs_addr_cursor { 706 struct afs_addr_list *alist; /* Current address list (pins ref) */ 707 unsigned long tried; /* Tried addresses */ 708 signed char index; /* Current address */ 709 bool responded; /* T if the current address responded */ 710 unsigned short nr_iterations; /* Number of address iterations */ 711 short error; 712 u32 abort_code; 713 }; 714 715 /* 716 * Cursor for iterating over a set of volume location servers. 717 */ 718 struct afs_vl_cursor { 719 struct afs_addr_cursor ac; 720 struct afs_cell *cell; /* The cell we're querying */ 721 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 722 struct afs_vlserver *server; /* Server on which this resides */ 723 struct key *key; /* Key for the server */ 724 unsigned long untried; /* Bitmask of untried servers */ 725 short index; /* Current server */ 726 short error; 727 unsigned short flags; 728 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 729 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 730 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 731 unsigned short nr_iterations; /* Number of server iterations */ 732 }; 733 734 /* 735 * Fileserver operation methods. 736 */ 737 struct afs_operation_ops { 738 void (*issue_afs_rpc)(struct afs_operation *op); 739 void (*issue_yfs_rpc)(struct afs_operation *op); 740 void (*success)(struct afs_operation *op); 741 void (*aborted)(struct afs_operation *op); 742 void (*edit_dir)(struct afs_operation *op); 743 void (*put)(struct afs_operation *op); 744 }; 745 746 struct afs_vnode_param { 747 struct afs_vnode *vnode; 748 struct afs_fid fid; /* Fid to access */ 749 struct afs_status_cb scb; /* Returned status and callback promise */ 750 afs_dataversion_t dv_before; /* Data version before the call */ 751 unsigned int cb_break_before; /* cb_break + cb_s_break before the call */ 752 u8 dv_delta; /* Expected change in data version */ 753 bool put_vnode:1; /* T if we have a ref on the vnode */ 754 bool need_io_lock:1; /* T if we need the I/O lock on this */ 755 bool update_ctime:1; /* Need to update the ctime */ 756 bool set_size:1; /* Must update i_size */ 757 bool op_unlinked:1; /* True if file was unlinked by op */ 758 }; 759 760 /* 761 * Fileserver operation wrapper, handling server and address rotation 762 * asynchronously. May make simultaneous calls to multiple servers. 763 */ 764 struct afs_operation { 765 struct afs_net *net; /* Network namespace */ 766 struct key *key; /* Key for the cell */ 767 const struct afs_call_type *type; /* Type of call done */ 768 const struct afs_operation_ops *ops; 769 770 /* Parameters/results for the operation */ 771 struct afs_volume *volume; /* Volume being accessed */ 772 struct afs_vnode_param file[2]; 773 struct afs_vnode_param *more_files; 774 struct afs_volsync volsync; 775 struct dentry *dentry; /* Dentry to be altered */ 776 struct dentry *dentry_2; /* Second dentry to be altered */ 777 struct timespec64 mtime; /* Modification time to record */ 778 struct timespec64 ctime; /* Change time to set */ 779 short nr_files; /* Number of entries in file[], more_files */ 780 short error; 781 unsigned int debug_id; 782 783 unsigned int cb_v_break; /* Volume break counter before op */ 784 unsigned int cb_s_break; /* Server break counter before op */ 785 786 union { 787 struct { 788 int which; /* Which ->file[] to fetch for */ 789 } fetch_status; 790 struct { 791 int reason; /* enum afs_edit_dir_reason */ 792 mode_t mode; 793 const char *symlink; 794 } create; 795 struct { 796 bool need_rehash; 797 } unlink; 798 struct { 799 struct dentry *rehash; 800 struct dentry *tmp; 801 bool new_negative; 802 } rename; 803 struct { 804 struct afs_read *req; 805 } fetch; 806 struct { 807 afs_lock_type_t type; 808 } lock; 809 struct { 810 struct address_space *mapping; /* Pages being written from */ 811 pgoff_t first; /* first page in mapping to deal with */ 812 pgoff_t last; /* last page in mapping to deal with */ 813 unsigned first_offset; /* offset into mapping[first] */ 814 unsigned last_to; /* amount of mapping[last] */ 815 } store; 816 struct { 817 struct iattr *attr; 818 loff_t old_i_size; 819 } setattr; 820 struct afs_acl *acl; 821 struct yfs_acl *yacl; 822 struct { 823 struct afs_volume_status vs; 824 struct kstatfs *buf; 825 } volstatus; 826 }; 827 828 /* Fileserver iteration state */ 829 struct afs_addr_cursor ac; 830 struct afs_server_list *server_list; /* Current server list (pins ref) */ 831 struct afs_server *server; /* Server we're using (ref pinned by server_list) */ 832 struct afs_call *call; 833 unsigned long untried; /* Bitmask of untried servers */ 834 short index; /* Current server */ 835 unsigned short nr_iterations; /* Number of server iterations */ 836 837 unsigned int flags; 838 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */ 839 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */ 840 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */ 841 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */ 842 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 843 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 844 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */ 845 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */ 846 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */ 847 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */ 848 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */ 849 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */ 850 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */ 851 }; 852 853 /* 854 * Cache auxiliary data. 855 */ 856 struct afs_vnode_cache_aux { 857 u64 data_version; 858 } __packed; 859 860 #include <trace/events/afs.h> 861 862 /*****************************************************************************/ 863 /* 864 * addr_list.c 865 */ 866 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 867 { 868 if (alist) 869 refcount_inc(&alist->usage); 870 return alist; 871 } 872 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 873 unsigned short, 874 unsigned short); 875 extern void afs_put_addrlist(struct afs_addr_list *); 876 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 877 const char *, size_t, char, 878 unsigned short, unsigned short); 879 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 880 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 881 extern int afs_end_cursor(struct afs_addr_cursor *); 882 883 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 884 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 885 886 /* 887 * cache.c 888 */ 889 #ifdef CONFIG_AFS_FSCACHE 890 extern struct fscache_netfs afs_cache_netfs; 891 extern struct fscache_cookie_def afs_cell_cache_index_def; 892 extern struct fscache_cookie_def afs_volume_cache_index_def; 893 extern struct fscache_cookie_def afs_vnode_cache_index_def; 894 #else 895 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 896 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 897 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 898 #endif 899 900 /* 901 * callback.c 902 */ 903 extern void afs_init_callback_state(struct afs_server *); 904 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 905 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 906 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 907 908 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 909 { 910 return vnode->cb_break + vnode->cb_v_break; 911 } 912 913 static inline bool afs_cb_is_broken(unsigned int cb_break, 914 const struct afs_vnode *vnode) 915 { 916 return cb_break != (vnode->cb_break + vnode->volume->cb_v_break); 917 } 918 919 /* 920 * cell.c 921 */ 922 extern int afs_cell_init(struct afs_net *, const char *); 923 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned, 924 enum afs_cell_trace); 925 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 926 const char *, bool); 927 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace); 928 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace); 929 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace); 930 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace); 931 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace); 932 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace); 933 extern void afs_manage_cells(struct work_struct *); 934 extern void afs_cells_timer(struct timer_list *); 935 extern void __net_exit afs_cell_purge(struct afs_net *); 936 937 /* 938 * cmservice.c 939 */ 940 extern bool afs_cm_incoming_call(struct afs_call *); 941 942 /* 943 * dir.c 944 */ 945 extern const struct file_operations afs_dir_file_operations; 946 extern const struct inode_operations afs_dir_inode_operations; 947 extern const struct address_space_operations afs_dir_aops; 948 extern const struct dentry_operations afs_fs_dentry_operations; 949 950 extern void afs_d_release(struct dentry *); 951 extern void afs_check_for_remote_deletion(struct afs_operation *); 952 953 /* 954 * dir_edit.c 955 */ 956 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 957 enum afs_edit_dir_reason); 958 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 959 960 /* 961 * dir_silly.c 962 */ 963 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 964 struct dentry *, struct key *); 965 extern int afs_silly_iput(struct dentry *, struct inode *); 966 967 /* 968 * dynroot.c 969 */ 970 extern const struct inode_operations afs_dynroot_inode_operations; 971 extern const struct dentry_operations afs_dynroot_dentry_operations; 972 973 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 974 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 975 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 976 extern int afs_dynroot_populate(struct super_block *); 977 extern void afs_dynroot_depopulate(struct super_block *); 978 979 /* 980 * file.c 981 */ 982 extern const struct address_space_operations afs_fs_aops; 983 extern const struct inode_operations afs_file_inode_operations; 984 extern const struct file_operations afs_file_operations; 985 986 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 987 extern void afs_put_wb_key(struct afs_wb_key *); 988 extern int afs_open(struct inode *, struct file *); 989 extern int afs_release(struct inode *, struct file *); 990 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 991 extern int afs_page_filler(void *, struct page *); 992 extern void afs_put_read(struct afs_read *); 993 994 static inline struct afs_read *afs_get_read(struct afs_read *req) 995 { 996 refcount_inc(&req->usage); 997 return req; 998 } 999 1000 /* 1001 * flock.c 1002 */ 1003 extern struct workqueue_struct *afs_lock_manager; 1004 1005 extern void afs_lock_op_done(struct afs_call *); 1006 extern void afs_lock_work(struct work_struct *); 1007 extern void afs_lock_may_be_available(struct afs_vnode *); 1008 extern int afs_lock(struct file *, int, struct file_lock *); 1009 extern int afs_flock(struct file *, int, struct file_lock *); 1010 1011 /* 1012 * fsclient.c 1013 */ 1014 extern void afs_fs_fetch_status(struct afs_operation *); 1015 extern void afs_fs_fetch_data(struct afs_operation *); 1016 extern void afs_fs_create_file(struct afs_operation *); 1017 extern void afs_fs_make_dir(struct afs_operation *); 1018 extern void afs_fs_remove_file(struct afs_operation *); 1019 extern void afs_fs_remove_dir(struct afs_operation *); 1020 extern void afs_fs_link(struct afs_operation *); 1021 extern void afs_fs_symlink(struct afs_operation *); 1022 extern void afs_fs_rename(struct afs_operation *); 1023 extern void afs_fs_store_data(struct afs_operation *); 1024 extern void afs_fs_setattr(struct afs_operation *); 1025 extern void afs_fs_get_volume_status(struct afs_operation *); 1026 extern void afs_fs_set_lock(struct afs_operation *); 1027 extern void afs_fs_extend_lock(struct afs_operation *); 1028 extern void afs_fs_release_lock(struct afs_operation *); 1029 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 1030 struct afs_addr_cursor *, struct key *); 1031 extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 1032 struct afs_addr_cursor *, struct key *); 1033 extern void afs_fs_inline_bulk_status(struct afs_operation *); 1034 1035 struct afs_acl { 1036 u32 size; 1037 u8 data[]; 1038 }; 1039 1040 extern void afs_fs_fetch_acl(struct afs_operation *); 1041 extern void afs_fs_store_acl(struct afs_operation *); 1042 1043 /* 1044 * fs_operation.c 1045 */ 1046 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *); 1047 extern int afs_put_operation(struct afs_operation *); 1048 extern bool afs_begin_vnode_operation(struct afs_operation *); 1049 extern void afs_wait_for_operation(struct afs_operation *); 1050 extern int afs_do_sync_operation(struct afs_operation *); 1051 1052 static inline void afs_op_nomem(struct afs_operation *op) 1053 { 1054 op->error = -ENOMEM; 1055 } 1056 1057 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1058 struct afs_vnode *vnode) 1059 { 1060 op->file[n].vnode = vnode; 1061 op->file[n].need_io_lock = true; 1062 } 1063 1064 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1065 const struct afs_fid *fid) 1066 { 1067 op->file[n].fid = *fid; 1068 } 1069 1070 /* 1071 * fs_probe.c 1072 */ 1073 extern void afs_fileserver_probe_result(struct afs_call *); 1074 extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool); 1075 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 1076 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1077 extern void afs_fs_probe_dispatcher(struct work_struct *); 1078 extern int afs_wait_for_one_fs_probe(struct afs_server *, bool); 1079 extern void afs_fs_probe_cleanup(struct afs_net *); 1080 1081 /* 1082 * inode.c 1083 */ 1084 extern const struct afs_operation_ops afs_fetch_status_operation; 1085 1086 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1087 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1088 extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1089 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1090 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *); 1091 extern struct inode *afs_root_iget(struct super_block *, struct key *); 1092 extern bool afs_check_validity(struct afs_vnode *); 1093 extern int afs_validate(struct afs_vnode *, struct key *); 1094 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1095 extern int afs_setattr(struct dentry *, struct iattr *); 1096 extern void afs_evict_inode(struct inode *); 1097 extern int afs_drop_inode(struct inode *); 1098 1099 /* 1100 * main.c 1101 */ 1102 extern struct workqueue_struct *afs_wq; 1103 extern int afs_net_id; 1104 1105 static inline struct afs_net *afs_net(struct net *net) 1106 { 1107 return net_generic(net, afs_net_id); 1108 } 1109 1110 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1111 { 1112 return afs_net(AFS_FS_S(sb)->net_ns); 1113 } 1114 1115 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1116 { 1117 return afs_sb2net(dentry->d_sb); 1118 } 1119 1120 static inline struct afs_net *afs_i2net(struct inode *inode) 1121 { 1122 return afs_sb2net(inode->i_sb); 1123 } 1124 1125 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1126 { 1127 return afs_i2net(&vnode->vfs_inode); 1128 } 1129 1130 static inline struct afs_net *afs_sock2net(struct sock *sk) 1131 { 1132 return net_generic(sock_net(sk), afs_net_id); 1133 } 1134 1135 static inline void __afs_stat(atomic_t *s) 1136 { 1137 atomic_inc(s); 1138 } 1139 1140 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1141 1142 /* 1143 * misc.c 1144 */ 1145 extern int afs_abort_to_error(u32); 1146 extern void afs_prioritise_error(struct afs_error *, int, u32); 1147 1148 /* 1149 * mntpt.c 1150 */ 1151 extern const struct inode_operations afs_mntpt_inode_operations; 1152 extern const struct inode_operations afs_autocell_inode_operations; 1153 extern const struct file_operations afs_mntpt_file_operations; 1154 1155 extern struct vfsmount *afs_d_automount(struct path *); 1156 extern void afs_mntpt_kill_timer(void); 1157 1158 /* 1159 * proc.c 1160 */ 1161 #ifdef CONFIG_PROC_FS 1162 extern int __net_init afs_proc_init(struct afs_net *); 1163 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1164 extern int afs_proc_cell_setup(struct afs_cell *); 1165 extern void afs_proc_cell_remove(struct afs_cell *); 1166 extern void afs_put_sysnames(struct afs_sysnames *); 1167 #else 1168 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1169 static inline void afs_proc_cleanup(struct afs_net *net) {} 1170 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1171 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1172 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1173 #endif 1174 1175 /* 1176 * rotate.c 1177 */ 1178 extern bool afs_select_fileserver(struct afs_operation *); 1179 extern void afs_dump_edestaddrreq(const struct afs_operation *); 1180 1181 /* 1182 * rxrpc.c 1183 */ 1184 extern struct workqueue_struct *afs_async_calls; 1185 1186 extern int __net_init afs_open_socket(struct afs_net *); 1187 extern void __net_exit afs_close_socket(struct afs_net *); 1188 extern void afs_charge_preallocation(struct work_struct *); 1189 extern void afs_put_call(struct afs_call *); 1190 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1191 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1192 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1193 const struct afs_call_type *, 1194 size_t, size_t); 1195 extern void afs_flat_call_destructor(struct afs_call *); 1196 extern void afs_send_empty_reply(struct afs_call *); 1197 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1198 extern int afs_extract_data(struct afs_call *, bool); 1199 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause); 1200 1201 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1202 gfp_t gfp) 1203 { 1204 op->call = call; 1205 op->type = call->type; 1206 call->op = op; 1207 call->key = op->key; 1208 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1209 afs_make_call(&op->ac, call, gfp); 1210 } 1211 1212 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1213 { 1214 call->kvec[0].iov_base = buf; 1215 call->kvec[0].iov_len = size; 1216 iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size); 1217 } 1218 1219 static inline void afs_extract_to_tmp(struct afs_call *call) 1220 { 1221 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1222 } 1223 1224 static inline void afs_extract_to_tmp64(struct afs_call *call) 1225 { 1226 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1227 } 1228 1229 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1230 { 1231 iov_iter_discard(&call->def_iter, READ, size); 1232 } 1233 1234 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1235 { 1236 afs_extract_begin(call, call->buffer, size); 1237 } 1238 1239 static inline int afs_transfer_reply(struct afs_call *call) 1240 { 1241 return afs_extract_data(call, false); 1242 } 1243 1244 static inline bool afs_check_call_state(struct afs_call *call, 1245 enum afs_call_state state) 1246 { 1247 return READ_ONCE(call->state) == state; 1248 } 1249 1250 static inline bool afs_set_call_state(struct afs_call *call, 1251 enum afs_call_state from, 1252 enum afs_call_state to) 1253 { 1254 bool ok = false; 1255 1256 spin_lock_bh(&call->state_lock); 1257 if (call->state == from) { 1258 call->state = to; 1259 trace_afs_call_state(call, from, to, 0, 0); 1260 ok = true; 1261 } 1262 spin_unlock_bh(&call->state_lock); 1263 return ok; 1264 } 1265 1266 static inline void afs_set_call_complete(struct afs_call *call, 1267 int error, u32 remote_abort) 1268 { 1269 enum afs_call_state state; 1270 bool ok = false; 1271 1272 spin_lock_bh(&call->state_lock); 1273 state = call->state; 1274 if (state != AFS_CALL_COMPLETE) { 1275 call->abort_code = remote_abort; 1276 call->error = error; 1277 call->state = AFS_CALL_COMPLETE; 1278 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1279 error, remote_abort); 1280 ok = true; 1281 } 1282 spin_unlock_bh(&call->state_lock); 1283 if (ok) { 1284 trace_afs_call_done(call); 1285 1286 /* Asynchronous calls have two refs to release - one from the alloc and 1287 * one queued with the work item - and we can't just deallocate the 1288 * call because the work item may be queued again. 1289 */ 1290 if (call->drop_ref) 1291 afs_put_call(call); 1292 } 1293 } 1294 1295 /* 1296 * security.c 1297 */ 1298 extern void afs_put_permits(struct afs_permits *); 1299 extern void afs_clear_permits(struct afs_vnode *); 1300 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1301 struct afs_status_cb *); 1302 extern void afs_zap_permits(struct rcu_head *); 1303 extern struct key *afs_request_key(struct afs_cell *); 1304 extern struct key *afs_request_key_rcu(struct afs_cell *); 1305 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1306 extern int afs_permission(struct inode *, int); 1307 extern void __exit afs_clean_up_permit_cache(void); 1308 1309 /* 1310 * server.c 1311 */ 1312 extern spinlock_t afs_server_peer_lock; 1313 1314 extern struct afs_server *afs_find_server(struct afs_net *, 1315 const struct sockaddr_rxrpc *); 1316 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1317 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1318 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1319 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace); 1320 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1321 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace); 1322 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1323 extern void afs_manage_servers(struct work_struct *); 1324 extern void afs_servers_timer(struct timer_list *); 1325 extern void afs_fs_probe_timer(struct timer_list *); 1326 extern void __net_exit afs_purge_servers(struct afs_net *); 1327 extern bool afs_check_server_record(struct afs_operation *, struct afs_server *); 1328 1329 static inline void afs_inc_servers_outstanding(struct afs_net *net) 1330 { 1331 atomic_inc(&net->servers_outstanding); 1332 } 1333 1334 static inline void afs_dec_servers_outstanding(struct afs_net *net) 1335 { 1336 if (atomic_dec_and_test(&net->servers_outstanding)) 1337 wake_up_var(&net->servers_outstanding); 1338 } 1339 1340 static inline bool afs_is_probing_server(struct afs_server *server) 1341 { 1342 return list_empty(&server->probe_link); 1343 } 1344 1345 /* 1346 * server_list.c 1347 */ 1348 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1349 { 1350 refcount_inc(&slist->usage); 1351 return slist; 1352 } 1353 1354 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1355 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1356 struct afs_vldb_entry *, 1357 u8); 1358 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1359 1360 /* 1361 * super.c 1362 */ 1363 extern int __init afs_fs_init(void); 1364 extern void afs_fs_exit(void); 1365 1366 /* 1367 * vlclient.c 1368 */ 1369 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1370 const char *, int); 1371 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1372 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1373 struct key *, struct afs_vlserver *, unsigned int); 1374 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1375 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1376 1377 /* 1378 * vl_alias.c 1379 */ 1380 extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1381 1382 /* 1383 * vl_probe.c 1384 */ 1385 extern void afs_vlserver_probe_result(struct afs_call *); 1386 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1387 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1388 1389 /* 1390 * vl_rotate.c 1391 */ 1392 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1393 struct afs_cell *, struct key *); 1394 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1395 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1396 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1397 1398 /* 1399 * vlserver_list.c 1400 */ 1401 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1402 { 1403 atomic_inc(&vlserver->usage); 1404 return vlserver; 1405 } 1406 1407 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1408 { 1409 if (vllist) 1410 atomic_inc(&vllist->usage); 1411 return vllist; 1412 } 1413 1414 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1415 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1416 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1417 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1418 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1419 const void *, size_t); 1420 1421 /* 1422 * volume.c 1423 */ 1424 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1425 extern void afs_activate_volume(struct afs_volume *); 1426 extern void afs_deactivate_volume(struct afs_volume *); 1427 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1428 extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace); 1429 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1430 1431 /* 1432 * write.c 1433 */ 1434 extern int afs_set_page_dirty(struct page *); 1435 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1436 loff_t pos, unsigned len, unsigned flags, 1437 struct page **pagep, void **fsdata); 1438 extern int afs_write_end(struct file *file, struct address_space *mapping, 1439 loff_t pos, unsigned len, unsigned copied, 1440 struct page *page, void *fsdata); 1441 extern int afs_writepage(struct page *, struct writeback_control *); 1442 extern int afs_writepages(struct address_space *, struct writeback_control *); 1443 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1444 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1445 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1446 extern void afs_prune_wb_keys(struct afs_vnode *); 1447 extern int afs_launder_page(struct page *); 1448 1449 /* 1450 * xattr.c 1451 */ 1452 extern const struct xattr_handler *afs_xattr_handlers[]; 1453 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1454 1455 /* 1456 * yfsclient.c 1457 */ 1458 extern void yfs_fs_fetch_data(struct afs_operation *); 1459 extern void yfs_fs_create_file(struct afs_operation *); 1460 extern void yfs_fs_make_dir(struct afs_operation *); 1461 extern void yfs_fs_remove_file2(struct afs_operation *); 1462 extern void yfs_fs_remove_file(struct afs_operation *); 1463 extern void yfs_fs_remove_dir(struct afs_operation *); 1464 extern void yfs_fs_link(struct afs_operation *); 1465 extern void yfs_fs_symlink(struct afs_operation *); 1466 extern void yfs_fs_rename(struct afs_operation *); 1467 extern void yfs_fs_store_data(struct afs_operation *); 1468 extern void yfs_fs_setattr(struct afs_operation *); 1469 extern void yfs_fs_get_volume_status(struct afs_operation *); 1470 extern void yfs_fs_set_lock(struct afs_operation *); 1471 extern void yfs_fs_extend_lock(struct afs_operation *); 1472 extern void yfs_fs_release_lock(struct afs_operation *); 1473 extern void yfs_fs_fetch_status(struct afs_operation *); 1474 extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1475 1476 struct yfs_acl { 1477 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1478 struct afs_acl *vol_acl; /* Whole volume ACL */ 1479 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1480 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1481 unsigned int flags; 1482 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1483 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1484 }; 1485 1486 extern void yfs_free_opaque_acl(struct yfs_acl *); 1487 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1488 extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1489 1490 /* 1491 * Miscellaneous inline functions. 1492 */ 1493 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1494 { 1495 return container_of(inode, struct afs_vnode, vfs_inode); 1496 } 1497 1498 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1499 { 1500 return &vnode->vfs_inode; 1501 } 1502 1503 /* 1504 * Note that a dentry got changed. We need to set d_fsdata to the data version 1505 * number derived from the result of the operation. It doesn't matter if 1506 * d_fsdata goes backwards as we'll just revalidate. 1507 */ 1508 static inline void afs_update_dentry_version(struct afs_operation *op, 1509 struct afs_vnode_param *dir_vp, 1510 struct dentry *dentry) 1511 { 1512 if (!op->error) 1513 dentry->d_fsdata = 1514 (void *)(unsigned long)dir_vp->scb.status.data_version; 1515 } 1516 1517 /* 1518 * Check for a conflicting operation on a directory that we just unlinked from. 1519 * If someone managed to sneak a link or an unlink in on the file we just 1520 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS). 1521 */ 1522 static inline void afs_check_dir_conflict(struct afs_operation *op, 1523 struct afs_vnode_param *dvp) 1524 { 1525 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version) 1526 op->flags |= AFS_OPERATION_DIR_CONFLICT; 1527 } 1528 1529 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1530 { 1531 trace_afs_io_error(call->debug_id, -EIO, where); 1532 return -EIO; 1533 } 1534 1535 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1536 { 1537 trace_afs_file_error(vnode, -EIO, where); 1538 return -EIO; 1539 } 1540 1541 /*****************************************************************************/ 1542 /* 1543 * debug tracing 1544 */ 1545 extern unsigned afs_debug; 1546 1547 #define dbgprintk(FMT,...) \ 1548 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1549 1550 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1551 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1552 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1553 1554 1555 #if defined(__KDEBUG) 1556 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1557 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1558 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1559 1560 #elif defined(CONFIG_AFS_DEBUG) 1561 #define AFS_DEBUG_KENTER 0x01 1562 #define AFS_DEBUG_KLEAVE 0x02 1563 #define AFS_DEBUG_KDEBUG 0x04 1564 1565 #define _enter(FMT,...) \ 1566 do { \ 1567 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1568 kenter(FMT,##__VA_ARGS__); \ 1569 } while (0) 1570 1571 #define _leave(FMT,...) \ 1572 do { \ 1573 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1574 kleave(FMT,##__VA_ARGS__); \ 1575 } while (0) 1576 1577 #define _debug(FMT,...) \ 1578 do { \ 1579 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1580 kdebug(FMT,##__VA_ARGS__); \ 1581 } while (0) 1582 1583 #else 1584 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1585 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1586 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1587 #endif 1588 1589 /* 1590 * debug assertion checking 1591 */ 1592 #if 1 // defined(__KDEBUGALL) 1593 1594 #define ASSERT(X) \ 1595 do { \ 1596 if (unlikely(!(X))) { \ 1597 printk(KERN_ERR "\n"); \ 1598 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1599 BUG(); \ 1600 } \ 1601 } while(0) 1602 1603 #define ASSERTCMP(X, OP, Y) \ 1604 do { \ 1605 if (unlikely(!((X) OP (Y)))) { \ 1606 printk(KERN_ERR "\n"); \ 1607 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1608 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1609 (unsigned long)(X), (unsigned long)(Y)); \ 1610 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1611 (unsigned long)(X), (unsigned long)(Y)); \ 1612 BUG(); \ 1613 } \ 1614 } while(0) 1615 1616 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1617 do { \ 1618 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1619 printk(KERN_ERR "\n"); \ 1620 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1621 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1622 (unsigned long)(L), (unsigned long)(N), \ 1623 (unsigned long)(H)); \ 1624 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1625 (unsigned long)(L), (unsigned long)(N), \ 1626 (unsigned long)(H)); \ 1627 BUG(); \ 1628 } \ 1629 } while(0) 1630 1631 #define ASSERTIF(C, X) \ 1632 do { \ 1633 if (unlikely((C) && !(X))) { \ 1634 printk(KERN_ERR "\n"); \ 1635 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1636 BUG(); \ 1637 } \ 1638 } while(0) 1639 1640 #define ASSERTIFCMP(C, X, OP, Y) \ 1641 do { \ 1642 if (unlikely((C) && !((X) OP (Y)))) { \ 1643 printk(KERN_ERR "\n"); \ 1644 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1645 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1646 (unsigned long)(X), (unsigned long)(Y)); \ 1647 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1648 (unsigned long)(X), (unsigned long)(Y)); \ 1649 BUG(); \ 1650 } \ 1651 } while(0) 1652 1653 #else 1654 1655 #define ASSERT(X) \ 1656 do { \ 1657 } while(0) 1658 1659 #define ASSERTCMP(X, OP, Y) \ 1660 do { \ 1661 } while(0) 1662 1663 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1664 do { \ 1665 } while(0) 1666 1667 #define ASSERTIF(C, X) \ 1668 do { \ 1669 } while(0) 1670 1671 #define ASSERTIFCMP(C, X, OP, Y) \ 1672 do { \ 1673 } while(0) 1674 1675 #endif /* __KDEBUGALL */ 1676