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[64 + 1]; /* 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 rwlock_t lock; /* Lock on addresses */ 405 atomic_t usage; 406 407 /* Probe state */ 408 wait_queue_head_t probe_wq; 409 atomic_t probe_outstanding; 410 spinlock_t probe_lock; 411 struct { 412 unsigned int rtt; /* RTT as ktime/64 */ 413 u32 abort_code; 414 short error; 415 bool have_result; 416 bool responded:1; 417 bool is_yfs:1; 418 bool not_yfs:1; 419 bool local_failure:1; 420 } probe; 421 422 u16 port; 423 u16 name_len; /* Length of name */ 424 char name[]; /* Server name, case-flattened */ 425 }; 426 427 /* 428 * Weighted list of Volume Location servers. 429 */ 430 struct afs_vlserver_entry { 431 u16 priority; /* Preference (as SRV) */ 432 u16 weight; /* Weight (as SRV) */ 433 enum dns_record_source source:8; 434 enum dns_lookup_status status:8; 435 struct afs_vlserver *server; 436 }; 437 438 struct afs_vlserver_list { 439 struct rcu_head rcu; 440 atomic_t usage; 441 u8 nr_servers; 442 u8 index; /* Server currently in use */ 443 u8 preferred; /* Preferred server */ 444 enum dns_record_source source:8; 445 enum dns_lookup_status status:8; 446 rwlock_t lock; 447 struct afs_vlserver_entry servers[]; 448 }; 449 450 /* 451 * Cached VLDB entry. 452 * 453 * This is pointed to by cell->vldb_entries, indexed by name. 454 */ 455 struct afs_vldb_entry { 456 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 457 458 unsigned long flags; 459 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 460 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 461 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 462 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 463 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 464 465 uuid_t fs_server[AFS_NMAXNSERVERS]; 466 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */ 467 u8 fs_mask[AFS_NMAXNSERVERS]; 468 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 469 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 470 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 471 short error; 472 u8 nr_servers; /* Number of server records */ 473 u8 name_len; 474 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 475 }; 476 477 /* 478 * Record of fileserver with which we're actively communicating. 479 */ 480 struct afs_server { 481 struct rcu_head rcu; 482 union { 483 uuid_t uuid; /* Server ID */ 484 struct afs_uuid _uuid; 485 }; 486 487 struct afs_addr_list __rcu *addresses; 488 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 489 struct rb_node uuid_rb; /* Link in net->fs_servers */ 490 struct afs_server __rcu *uuid_next; /* Next server with same UUID */ 491 struct afs_server *uuid_prev; /* Previous server with same UUID */ 492 struct list_head probe_link; /* Link in net->fs_probe_list */ 493 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 494 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 495 struct hlist_node proc_link; /* Link in net->fs_proc */ 496 struct afs_server *gc_next; /* Next server in manager's list */ 497 time64_t unuse_time; /* Time at which last unused */ 498 unsigned long flags; 499 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 500 #define AFS_SERVER_FL_UPDATING 1 501 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 502 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */ 503 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */ 504 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */ 505 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 506 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 507 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 508 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 509 atomic_t ref; /* Object refcount */ 510 atomic_t active; /* Active user count */ 511 u32 addr_version; /* Address list version */ 512 unsigned int rtt; /* Server's current RTT in uS */ 513 unsigned int debug_id; /* Debugging ID for traces */ 514 515 /* file service access */ 516 rwlock_t fs_lock; /* access lock */ 517 518 /* callback promise management */ 519 unsigned cb_s_break; /* Break-everything counter. */ 520 521 /* Probe state */ 522 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 523 wait_queue_head_t probe_wq; 524 atomic_t probe_outstanding; 525 spinlock_t probe_lock; 526 struct { 527 unsigned int rtt; /* RTT in uS */ 528 u32 abort_code; 529 short error; 530 bool responded:1; 531 bool is_yfs:1; 532 bool not_yfs:1; 533 bool local_failure:1; 534 } probe; 535 }; 536 537 /* 538 * Replaceable volume server list. 539 */ 540 struct afs_server_entry { 541 struct afs_server *server; 542 }; 543 544 struct afs_server_list { 545 afs_volid_t vids[AFS_MAXTYPES]; /* Volume IDs */ 546 refcount_t usage; 547 unsigned char nr_servers; 548 unsigned char preferred; /* Preferred server */ 549 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 550 unsigned int seq; /* Set to ->servers_seq when installed */ 551 rwlock_t lock; 552 struct afs_server_entry servers[]; 553 }; 554 555 /* 556 * Live AFS volume management. 557 */ 558 struct afs_volume { 559 union { 560 struct rcu_head rcu; 561 afs_volid_t vid; /* volume ID */ 562 }; 563 atomic_t usage; 564 time64_t update_at; /* Time at which to next update */ 565 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 566 struct rb_node cell_node; /* Link in cell->volumes */ 567 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 568 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 569 unsigned long flags; 570 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 571 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 572 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 573 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 574 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 575 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 576 #define AFS_VOLUME_MAYBE_NO_IBULK 6 /* - T if some servers don't have InlineBulkStatus */ 577 #ifdef CONFIG_AFS_FSCACHE 578 struct fscache_cookie *cache; /* caching cookie */ 579 #endif 580 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 581 rwlock_t servers_lock; /* Lock for ->servers */ 582 unsigned int servers_seq; /* Incremented each time ->servers changes */ 583 584 unsigned cb_v_break; /* Break-everything counter. */ 585 rwlock_t cb_v_break_lock; 586 587 afs_voltype_t type; /* type of volume */ 588 char type_force; /* force volume type (suppress R/O -> R/W) */ 589 u8 name_len; 590 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 591 }; 592 593 enum afs_lock_state { 594 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 595 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 596 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 597 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 598 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 599 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 600 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 601 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 602 }; 603 604 /* 605 * AFS inode private data. 606 * 607 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 608 * leak from one inode to another. 609 */ 610 struct afs_vnode { 611 struct inode vfs_inode; /* the VFS's inode record */ 612 613 struct afs_volume *volume; /* volume on which vnode resides */ 614 struct afs_fid fid; /* the file identifier for this inode */ 615 struct afs_file_status status; /* AFS status info for this file */ 616 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 617 #ifdef CONFIG_AFS_FSCACHE 618 struct fscache_cookie *cache; /* caching cookie */ 619 #endif 620 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 621 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 622 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 623 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 624 struct key *silly_key; /* Silly rename key */ 625 spinlock_t wb_lock; /* lock for wb_keys */ 626 spinlock_t lock; /* waitqueue/flags lock */ 627 unsigned long flags; 628 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 629 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 630 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 631 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 632 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 633 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 634 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 635 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 636 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 637 638 struct list_head wb_keys; /* List of keys available for writeback */ 639 struct list_head pending_locks; /* locks waiting to be granted */ 640 struct list_head granted_locks; /* locks granted on this file */ 641 struct delayed_work lock_work; /* work to be done in locking */ 642 struct key *lock_key; /* Key to be used in lock ops */ 643 ktime_t locked_at; /* Time at which lock obtained */ 644 enum afs_lock_state lock_state : 8; 645 afs_lock_type_t lock_type : 8; 646 647 /* outstanding callback notification on this file */ 648 void *cb_server; /* Server with callback/filelock */ 649 unsigned int cb_s_break; /* Mass break counter on ->server */ 650 unsigned int cb_v_break; /* Mass break counter on ->volume */ 651 unsigned int cb_break; /* Break counter on vnode */ 652 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 653 654 time64_t cb_expires_at; /* time at which callback expires */ 655 }; 656 657 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 658 { 659 #ifdef CONFIG_AFS_FSCACHE 660 return vnode->cache; 661 #else 662 return NULL; 663 #endif 664 } 665 666 /* 667 * cached security record for one user's attempt to access a vnode 668 */ 669 struct afs_permit { 670 struct key *key; /* RxRPC ticket holding a security context */ 671 afs_access_t access; /* CallerAccess value for this key */ 672 }; 673 674 /* 675 * Immutable cache of CallerAccess records from attempts to access vnodes. 676 * These may be shared between multiple vnodes. 677 */ 678 struct afs_permits { 679 struct rcu_head rcu; 680 struct hlist_node hash_node; /* Link in hash */ 681 unsigned long h; /* Hash value for this permit list */ 682 refcount_t usage; 683 unsigned short nr_permits; /* Number of records */ 684 bool invalidated; /* Invalidated due to key change */ 685 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 686 }; 687 688 /* 689 * Error prioritisation and accumulation. 690 */ 691 struct afs_error { 692 short error; /* Accumulated error */ 693 bool responded; /* T if server responded */ 694 }; 695 696 /* 697 * Cursor for iterating over a server's address list. 698 */ 699 struct afs_addr_cursor { 700 struct afs_addr_list *alist; /* Current address list (pins ref) */ 701 unsigned long tried; /* Tried addresses */ 702 signed char index; /* Current address */ 703 bool responded; /* T if the current address responded */ 704 unsigned short nr_iterations; /* Number of address iterations */ 705 short error; 706 u32 abort_code; 707 }; 708 709 /* 710 * Cursor for iterating over a set of volume location servers. 711 */ 712 struct afs_vl_cursor { 713 struct afs_addr_cursor ac; 714 struct afs_cell *cell; /* The cell we're querying */ 715 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 716 struct afs_vlserver *server; /* Server on which this resides */ 717 struct key *key; /* Key for the server */ 718 unsigned long untried; /* Bitmask of untried servers */ 719 short index; /* Current server */ 720 short error; 721 unsigned short flags; 722 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 723 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 724 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 725 unsigned short nr_iterations; /* Number of server iterations */ 726 }; 727 728 /* 729 * Fileserver operation methods. 730 */ 731 struct afs_operation_ops { 732 void (*issue_afs_rpc)(struct afs_operation *op); 733 void (*issue_yfs_rpc)(struct afs_operation *op); 734 void (*success)(struct afs_operation *op); 735 void (*aborted)(struct afs_operation *op); 736 void (*edit_dir)(struct afs_operation *op); 737 void (*put)(struct afs_operation *op); 738 }; 739 740 struct afs_vnode_param { 741 struct afs_vnode *vnode; 742 struct afs_fid fid; /* Fid to access */ 743 struct afs_status_cb scb; /* Returned status and callback promise */ 744 afs_dataversion_t dv_before; /* Data version before the call */ 745 unsigned int cb_break_before; /* cb_break + cb_s_break before the call */ 746 u8 dv_delta; /* Expected change in data version */ 747 bool put_vnode; /* T if we have a ref on the vnode */ 748 bool need_io_lock; /* T if we need the I/O lock on this */ 749 }; 750 751 /* 752 * Fileserver operation wrapper, handling server and address rotation 753 * asynchronously. May make simultaneous calls to multiple servers. 754 */ 755 struct afs_operation { 756 struct afs_net *net; /* Network namespace */ 757 struct key *key; /* Key for the cell */ 758 const struct afs_call_type *type; /* Type of call done */ 759 const struct afs_operation_ops *ops; 760 761 /* Parameters/results for the operation */ 762 struct afs_volume *volume; /* Volume being accessed */ 763 struct afs_vnode_param file[2]; 764 struct afs_vnode_param *more_files; 765 struct afs_volsync volsync; 766 struct dentry *dentry; /* Dentry to be altered */ 767 struct dentry *dentry_2; /* Second dentry to be altered */ 768 struct timespec64 mtime; /* Modification time to record */ 769 short nr_files; /* Number of entries in file[], more_files */ 770 short error; 771 unsigned int abort_code; 772 unsigned int debug_id; 773 774 unsigned int cb_v_break; /* Volume break counter before op */ 775 unsigned int cb_s_break; /* Server break counter before op */ 776 777 union { 778 struct { 779 int which; /* Which ->file[] to fetch for */ 780 } fetch_status; 781 struct { 782 int reason; /* enum afs_edit_dir_reason */ 783 mode_t mode; 784 const char *symlink; 785 } create; 786 struct { 787 bool need_rehash; 788 } unlink; 789 struct { 790 struct dentry *rehash; 791 struct dentry *tmp; 792 bool new_negative; 793 } rename; 794 struct { 795 struct afs_read *req; 796 } fetch; 797 struct { 798 afs_lock_type_t type; 799 } lock; 800 struct { 801 struct address_space *mapping; /* Pages being written from */ 802 pgoff_t first; /* first page in mapping to deal with */ 803 pgoff_t last; /* last page in mapping to deal with */ 804 unsigned first_offset; /* offset into mapping[first] */ 805 unsigned last_to; /* amount of mapping[last] */ 806 } store; 807 struct { 808 struct iattr *attr; 809 } setattr; 810 struct afs_acl *acl; 811 struct yfs_acl *yacl; 812 struct { 813 struct afs_volume_status vs; 814 struct kstatfs *buf; 815 } volstatus; 816 }; 817 818 /* Fileserver iteration state */ 819 struct afs_addr_cursor ac; 820 struct afs_server_list *server_list; /* Current server list (pins ref) */ 821 struct afs_server *server; /* Server we're using (ref pinned by server_list) */ 822 struct afs_call *call; 823 unsigned long untried; /* Bitmask of untried servers */ 824 short index; /* Current server */ 825 unsigned short nr_iterations; /* Number of server iterations */ 826 827 unsigned int flags; 828 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */ 829 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */ 830 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */ 831 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */ 832 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 833 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 834 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */ 835 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */ 836 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */ 837 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */ 838 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */ 839 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */ 840 }; 841 842 /* 843 * Cache auxiliary data. 844 */ 845 struct afs_vnode_cache_aux { 846 u64 data_version; 847 } __packed; 848 849 #include <trace/events/afs.h> 850 851 /*****************************************************************************/ 852 /* 853 * addr_list.c 854 */ 855 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 856 { 857 if (alist) 858 refcount_inc(&alist->usage); 859 return alist; 860 } 861 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 862 unsigned short, 863 unsigned short); 864 extern void afs_put_addrlist(struct afs_addr_list *); 865 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 866 const char *, size_t, char, 867 unsigned short, unsigned short); 868 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 869 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 870 extern int afs_end_cursor(struct afs_addr_cursor *); 871 872 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 873 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 874 875 /* 876 * cache.c 877 */ 878 #ifdef CONFIG_AFS_FSCACHE 879 extern struct fscache_netfs afs_cache_netfs; 880 extern struct fscache_cookie_def afs_cell_cache_index_def; 881 extern struct fscache_cookie_def afs_volume_cache_index_def; 882 extern struct fscache_cookie_def afs_vnode_cache_index_def; 883 #else 884 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 885 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 886 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 887 #endif 888 889 /* 890 * callback.c 891 */ 892 extern void afs_init_callback_state(struct afs_server *); 893 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 894 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 895 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 896 897 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 898 { 899 return vnode->cb_break + vnode->cb_v_break; 900 } 901 902 static inline bool afs_cb_is_broken(unsigned int cb_break, 903 const struct afs_vnode *vnode) 904 { 905 return cb_break != (vnode->cb_break + vnode->volume->cb_v_break); 906 } 907 908 /* 909 * cell.c 910 */ 911 extern int afs_cell_init(struct afs_net *, const char *); 912 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 913 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 914 const char *, bool); 915 extern struct afs_cell *afs_get_cell(struct afs_cell *); 916 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 917 extern void afs_manage_cells(struct work_struct *); 918 extern void afs_cells_timer(struct timer_list *); 919 extern void __net_exit afs_cell_purge(struct afs_net *); 920 921 /* 922 * cmservice.c 923 */ 924 extern bool afs_cm_incoming_call(struct afs_call *); 925 926 /* 927 * dir.c 928 */ 929 extern const struct file_operations afs_dir_file_operations; 930 extern const struct inode_operations afs_dir_inode_operations; 931 extern const struct address_space_operations afs_dir_aops; 932 extern const struct dentry_operations afs_fs_dentry_operations; 933 934 extern void afs_d_release(struct dentry *); 935 936 /* 937 * dir_edit.c 938 */ 939 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 940 enum afs_edit_dir_reason); 941 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 942 943 /* 944 * dir_silly.c 945 */ 946 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 947 struct dentry *, struct key *); 948 extern int afs_silly_iput(struct dentry *, struct inode *); 949 950 /* 951 * dynroot.c 952 */ 953 extern const struct inode_operations afs_dynroot_inode_operations; 954 extern const struct dentry_operations afs_dynroot_dentry_operations; 955 956 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 957 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 958 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 959 extern int afs_dynroot_populate(struct super_block *); 960 extern void afs_dynroot_depopulate(struct super_block *); 961 962 /* 963 * file.c 964 */ 965 extern const struct address_space_operations afs_fs_aops; 966 extern const struct inode_operations afs_file_inode_operations; 967 extern const struct file_operations afs_file_operations; 968 969 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 970 extern void afs_put_wb_key(struct afs_wb_key *); 971 extern int afs_open(struct inode *, struct file *); 972 extern int afs_release(struct inode *, struct file *); 973 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 974 extern int afs_page_filler(void *, struct page *); 975 extern void afs_put_read(struct afs_read *); 976 977 static inline struct afs_read *afs_get_read(struct afs_read *req) 978 { 979 refcount_inc(&req->usage); 980 return req; 981 } 982 983 /* 984 * flock.c 985 */ 986 extern struct workqueue_struct *afs_lock_manager; 987 988 extern void afs_lock_op_done(struct afs_call *); 989 extern void afs_lock_work(struct work_struct *); 990 extern void afs_lock_may_be_available(struct afs_vnode *); 991 extern int afs_lock(struct file *, int, struct file_lock *); 992 extern int afs_flock(struct file *, int, struct file_lock *); 993 994 /* 995 * fsclient.c 996 */ 997 extern void afs_fs_fetch_status(struct afs_operation *); 998 extern void afs_fs_fetch_data(struct afs_operation *); 999 extern void afs_fs_create_file(struct afs_operation *); 1000 extern void afs_fs_make_dir(struct afs_operation *); 1001 extern void afs_fs_remove_file(struct afs_operation *); 1002 extern void afs_fs_remove_dir(struct afs_operation *); 1003 extern void afs_fs_link(struct afs_operation *); 1004 extern void afs_fs_symlink(struct afs_operation *); 1005 extern void afs_fs_rename(struct afs_operation *); 1006 extern void afs_fs_store_data(struct afs_operation *); 1007 extern void afs_fs_setattr(struct afs_operation *); 1008 extern void afs_fs_get_volume_status(struct afs_operation *); 1009 extern void afs_fs_set_lock(struct afs_operation *); 1010 extern void afs_fs_extend_lock(struct afs_operation *); 1011 extern void afs_fs_release_lock(struct afs_operation *); 1012 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 1013 struct afs_addr_cursor *, struct key *); 1014 extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 1015 struct afs_addr_cursor *, struct key *); 1016 extern void afs_fs_inline_bulk_status(struct afs_operation *); 1017 1018 struct afs_acl { 1019 u32 size; 1020 u8 data[]; 1021 }; 1022 1023 extern void afs_fs_fetch_acl(struct afs_operation *); 1024 extern void afs_fs_store_acl(struct afs_operation *); 1025 1026 /* 1027 * fs_operation.c 1028 */ 1029 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *); 1030 extern int afs_put_operation(struct afs_operation *); 1031 extern bool afs_begin_vnode_operation(struct afs_operation *); 1032 extern void afs_wait_for_operation(struct afs_operation *); 1033 extern int afs_do_sync_operation(struct afs_operation *); 1034 1035 static inline void afs_op_nomem(struct afs_operation *op) 1036 { 1037 op->error = -ENOMEM; 1038 } 1039 1040 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1041 struct afs_vnode *vnode) 1042 { 1043 op->file[n].vnode = vnode; 1044 op->file[n].need_io_lock = true; 1045 } 1046 1047 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1048 const struct afs_fid *fid) 1049 { 1050 op->file[n].fid = *fid; 1051 } 1052 1053 /* 1054 * fs_probe.c 1055 */ 1056 extern void afs_fileserver_probe_result(struct afs_call *); 1057 extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool); 1058 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 1059 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1060 extern void afs_fs_probe_dispatcher(struct work_struct *); 1061 extern int afs_wait_for_one_fs_probe(struct afs_server *, bool); 1062 1063 /* 1064 * inode.c 1065 */ 1066 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1067 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1068 extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1069 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1070 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *); 1071 extern struct inode *afs_root_iget(struct super_block *, struct key *); 1072 extern bool afs_check_validity(struct afs_vnode *); 1073 extern int afs_validate(struct afs_vnode *, struct key *); 1074 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1075 extern int afs_setattr(struct dentry *, struct iattr *); 1076 extern void afs_evict_inode(struct inode *); 1077 extern int afs_drop_inode(struct inode *); 1078 1079 /* 1080 * main.c 1081 */ 1082 extern struct workqueue_struct *afs_wq; 1083 extern int afs_net_id; 1084 1085 static inline struct afs_net *afs_net(struct net *net) 1086 { 1087 return net_generic(net, afs_net_id); 1088 } 1089 1090 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1091 { 1092 return afs_net(AFS_FS_S(sb)->net_ns); 1093 } 1094 1095 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1096 { 1097 return afs_sb2net(dentry->d_sb); 1098 } 1099 1100 static inline struct afs_net *afs_i2net(struct inode *inode) 1101 { 1102 return afs_sb2net(inode->i_sb); 1103 } 1104 1105 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1106 { 1107 return afs_i2net(&vnode->vfs_inode); 1108 } 1109 1110 static inline struct afs_net *afs_sock2net(struct sock *sk) 1111 { 1112 return net_generic(sock_net(sk), afs_net_id); 1113 } 1114 1115 static inline void __afs_stat(atomic_t *s) 1116 { 1117 atomic_inc(s); 1118 } 1119 1120 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1121 1122 /* 1123 * misc.c 1124 */ 1125 extern int afs_abort_to_error(u32); 1126 extern void afs_prioritise_error(struct afs_error *, int, u32); 1127 1128 /* 1129 * mntpt.c 1130 */ 1131 extern const struct inode_operations afs_mntpt_inode_operations; 1132 extern const struct inode_operations afs_autocell_inode_operations; 1133 extern const struct file_operations afs_mntpt_file_operations; 1134 1135 extern struct vfsmount *afs_d_automount(struct path *); 1136 extern void afs_mntpt_kill_timer(void); 1137 1138 /* 1139 * proc.c 1140 */ 1141 #ifdef CONFIG_PROC_FS 1142 extern int __net_init afs_proc_init(struct afs_net *); 1143 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1144 extern int afs_proc_cell_setup(struct afs_cell *); 1145 extern void afs_proc_cell_remove(struct afs_cell *); 1146 extern void afs_put_sysnames(struct afs_sysnames *); 1147 #else 1148 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1149 static inline void afs_proc_cleanup(struct afs_net *net) {} 1150 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1151 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1152 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1153 #endif 1154 1155 /* 1156 * rotate.c 1157 */ 1158 extern bool afs_select_fileserver(struct afs_operation *); 1159 extern void afs_dump_edestaddrreq(const struct afs_operation *); 1160 1161 /* 1162 * rxrpc.c 1163 */ 1164 extern struct workqueue_struct *afs_async_calls; 1165 1166 extern int __net_init afs_open_socket(struct afs_net *); 1167 extern void __net_exit afs_close_socket(struct afs_net *); 1168 extern void afs_charge_preallocation(struct work_struct *); 1169 extern void afs_put_call(struct afs_call *); 1170 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1171 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1172 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1173 const struct afs_call_type *, 1174 size_t, size_t); 1175 extern void afs_flat_call_destructor(struct afs_call *); 1176 extern void afs_send_empty_reply(struct afs_call *); 1177 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1178 extern int afs_extract_data(struct afs_call *, bool); 1179 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause); 1180 1181 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1182 gfp_t gfp) 1183 { 1184 op->call = call; 1185 op->type = call->type; 1186 call->op = op; 1187 call->key = op->key; 1188 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1189 afs_make_call(&op->ac, call, gfp); 1190 } 1191 1192 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1193 { 1194 call->kvec[0].iov_base = buf; 1195 call->kvec[0].iov_len = size; 1196 iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size); 1197 } 1198 1199 static inline void afs_extract_to_tmp(struct afs_call *call) 1200 { 1201 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1202 } 1203 1204 static inline void afs_extract_to_tmp64(struct afs_call *call) 1205 { 1206 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1207 } 1208 1209 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1210 { 1211 iov_iter_discard(&call->def_iter, READ, size); 1212 } 1213 1214 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1215 { 1216 afs_extract_begin(call, call->buffer, size); 1217 } 1218 1219 static inline int afs_transfer_reply(struct afs_call *call) 1220 { 1221 return afs_extract_data(call, false); 1222 } 1223 1224 static inline bool afs_check_call_state(struct afs_call *call, 1225 enum afs_call_state state) 1226 { 1227 return READ_ONCE(call->state) == state; 1228 } 1229 1230 static inline bool afs_set_call_state(struct afs_call *call, 1231 enum afs_call_state from, 1232 enum afs_call_state to) 1233 { 1234 bool ok = false; 1235 1236 spin_lock_bh(&call->state_lock); 1237 if (call->state == from) { 1238 call->state = to; 1239 trace_afs_call_state(call, from, to, 0, 0); 1240 ok = true; 1241 } 1242 spin_unlock_bh(&call->state_lock); 1243 return ok; 1244 } 1245 1246 static inline void afs_set_call_complete(struct afs_call *call, 1247 int error, u32 remote_abort) 1248 { 1249 enum afs_call_state state; 1250 bool ok = false; 1251 1252 spin_lock_bh(&call->state_lock); 1253 state = call->state; 1254 if (state != AFS_CALL_COMPLETE) { 1255 call->abort_code = remote_abort; 1256 call->error = error; 1257 call->state = AFS_CALL_COMPLETE; 1258 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1259 error, remote_abort); 1260 ok = true; 1261 } 1262 spin_unlock_bh(&call->state_lock); 1263 if (ok) { 1264 trace_afs_call_done(call); 1265 1266 /* Asynchronous calls have two refs to release - one from the alloc and 1267 * one queued with the work item - and we can't just deallocate the 1268 * call because the work item may be queued again. 1269 */ 1270 if (call->drop_ref) 1271 afs_put_call(call); 1272 } 1273 } 1274 1275 /* 1276 * security.c 1277 */ 1278 extern void afs_put_permits(struct afs_permits *); 1279 extern void afs_clear_permits(struct afs_vnode *); 1280 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1281 struct afs_status_cb *); 1282 extern void afs_zap_permits(struct rcu_head *); 1283 extern struct key *afs_request_key(struct afs_cell *); 1284 extern struct key *afs_request_key_rcu(struct afs_cell *); 1285 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1286 extern int afs_permission(struct inode *, int); 1287 extern void __exit afs_clean_up_permit_cache(void); 1288 1289 /* 1290 * server.c 1291 */ 1292 extern spinlock_t afs_server_peer_lock; 1293 1294 extern struct afs_server *afs_find_server(struct afs_net *, 1295 const struct sockaddr_rxrpc *); 1296 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1297 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1298 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1299 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace); 1300 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1301 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace); 1302 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1303 extern void afs_manage_servers(struct work_struct *); 1304 extern void afs_servers_timer(struct timer_list *); 1305 extern void afs_fs_probe_timer(struct timer_list *); 1306 extern void __net_exit afs_purge_servers(struct afs_net *); 1307 extern bool afs_check_server_record(struct afs_operation *, struct afs_server *); 1308 1309 static inline void afs_inc_servers_outstanding(struct afs_net *net) 1310 { 1311 atomic_inc(&net->servers_outstanding); 1312 } 1313 1314 static inline void afs_dec_servers_outstanding(struct afs_net *net) 1315 { 1316 if (atomic_dec_and_test(&net->servers_outstanding)) 1317 wake_up_var(&net->servers_outstanding); 1318 } 1319 1320 static inline bool afs_is_probing_server(struct afs_server *server) 1321 { 1322 return list_empty(&server->probe_link); 1323 } 1324 1325 /* 1326 * server_list.c 1327 */ 1328 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1329 { 1330 refcount_inc(&slist->usage); 1331 return slist; 1332 } 1333 1334 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1335 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1336 struct afs_vldb_entry *, 1337 u8); 1338 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1339 1340 /* 1341 * super.c 1342 */ 1343 extern int __init afs_fs_init(void); 1344 extern void afs_fs_exit(void); 1345 1346 /* 1347 * vlclient.c 1348 */ 1349 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1350 const char *, int); 1351 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1352 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1353 struct key *, struct afs_vlserver *, unsigned int); 1354 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1355 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1356 1357 /* 1358 * vl_alias.c 1359 */ 1360 extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1361 1362 /* 1363 * vl_probe.c 1364 */ 1365 extern void afs_vlserver_probe_result(struct afs_call *); 1366 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1367 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1368 1369 /* 1370 * vl_rotate.c 1371 */ 1372 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1373 struct afs_cell *, struct key *); 1374 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1375 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1376 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1377 1378 /* 1379 * vlserver_list.c 1380 */ 1381 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1382 { 1383 atomic_inc(&vlserver->usage); 1384 return vlserver; 1385 } 1386 1387 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1388 { 1389 if (vllist) 1390 atomic_inc(&vllist->usage); 1391 return vllist; 1392 } 1393 1394 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1395 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1396 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1397 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1398 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1399 const void *, size_t); 1400 1401 /* 1402 * volume.c 1403 */ 1404 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1405 extern void afs_activate_volume(struct afs_volume *); 1406 extern void afs_deactivate_volume(struct afs_volume *); 1407 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1408 extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace); 1409 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1410 1411 /* 1412 * write.c 1413 */ 1414 extern int afs_set_page_dirty(struct page *); 1415 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1416 loff_t pos, unsigned len, unsigned flags, 1417 struct page **pagep, void **fsdata); 1418 extern int afs_write_end(struct file *file, struct address_space *mapping, 1419 loff_t pos, unsigned len, unsigned copied, 1420 struct page *page, void *fsdata); 1421 extern int afs_writepage(struct page *, struct writeback_control *); 1422 extern int afs_writepages(struct address_space *, struct writeback_control *); 1423 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1424 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1425 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1426 extern void afs_prune_wb_keys(struct afs_vnode *); 1427 extern int afs_launder_page(struct page *); 1428 1429 /* 1430 * xattr.c 1431 */ 1432 extern const struct xattr_handler *afs_xattr_handlers[]; 1433 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1434 1435 /* 1436 * yfsclient.c 1437 */ 1438 extern void yfs_fs_fetch_file_status(struct afs_operation *); 1439 extern void yfs_fs_fetch_data(struct afs_operation *); 1440 extern void yfs_fs_create_file(struct afs_operation *); 1441 extern void yfs_fs_make_dir(struct afs_operation *); 1442 extern void yfs_fs_remove_file2(struct afs_operation *); 1443 extern void yfs_fs_remove_file(struct afs_operation *); 1444 extern void yfs_fs_remove_dir(struct afs_operation *); 1445 extern void yfs_fs_link(struct afs_operation *); 1446 extern void yfs_fs_symlink(struct afs_operation *); 1447 extern void yfs_fs_rename(struct afs_operation *); 1448 extern void yfs_fs_store_data(struct afs_operation *); 1449 extern void yfs_fs_setattr(struct afs_operation *); 1450 extern void yfs_fs_get_volume_status(struct afs_operation *); 1451 extern void yfs_fs_set_lock(struct afs_operation *); 1452 extern void yfs_fs_extend_lock(struct afs_operation *); 1453 extern void yfs_fs_release_lock(struct afs_operation *); 1454 extern void yfs_fs_fetch_status(struct afs_operation *); 1455 extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1456 1457 struct yfs_acl { 1458 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1459 struct afs_acl *vol_acl; /* Whole volume ACL */ 1460 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1461 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1462 unsigned int flags; 1463 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1464 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1465 }; 1466 1467 extern void yfs_free_opaque_acl(struct yfs_acl *); 1468 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1469 extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1470 1471 /* 1472 * Miscellaneous inline functions. 1473 */ 1474 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1475 { 1476 return container_of(inode, struct afs_vnode, vfs_inode); 1477 } 1478 1479 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1480 { 1481 return &vnode->vfs_inode; 1482 } 1483 1484 static inline void afs_check_for_remote_deletion(struct afs_operation *op, 1485 struct afs_vnode *vnode) 1486 { 1487 if (op->error == -ENOENT) { 1488 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1489 afs_break_callback(vnode, afs_cb_break_for_deleted); 1490 } 1491 } 1492 1493 /* 1494 * Note that a dentry got changed. We need to set d_fsdata to the data version 1495 * number derived from the result of the operation. It doesn't matter if 1496 * d_fsdata goes backwards as we'll just revalidate. 1497 */ 1498 static inline void afs_update_dentry_version(struct afs_operation *op, 1499 struct afs_vnode_param *dir_vp, 1500 struct dentry *dentry) 1501 { 1502 if (!op->error) 1503 dentry->d_fsdata = 1504 (void *)(unsigned long)dir_vp->scb.status.data_version; 1505 } 1506 1507 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1508 { 1509 trace_afs_io_error(call->debug_id, -EIO, where); 1510 return -EIO; 1511 } 1512 1513 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1514 { 1515 trace_afs_file_error(vnode, -EIO, where); 1516 return -EIO; 1517 } 1518 1519 /*****************************************************************************/ 1520 /* 1521 * debug tracing 1522 */ 1523 extern unsigned afs_debug; 1524 1525 #define dbgprintk(FMT,...) \ 1526 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1527 1528 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1529 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1530 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1531 1532 1533 #if defined(__KDEBUG) 1534 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1535 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1536 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1537 1538 #elif defined(CONFIG_AFS_DEBUG) 1539 #define AFS_DEBUG_KENTER 0x01 1540 #define AFS_DEBUG_KLEAVE 0x02 1541 #define AFS_DEBUG_KDEBUG 0x04 1542 1543 #define _enter(FMT,...) \ 1544 do { \ 1545 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1546 kenter(FMT,##__VA_ARGS__); \ 1547 } while (0) 1548 1549 #define _leave(FMT,...) \ 1550 do { \ 1551 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1552 kleave(FMT,##__VA_ARGS__); \ 1553 } while (0) 1554 1555 #define _debug(FMT,...) \ 1556 do { \ 1557 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1558 kdebug(FMT,##__VA_ARGS__); \ 1559 } while (0) 1560 1561 #else 1562 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1563 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1564 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1565 #endif 1566 1567 /* 1568 * debug assertion checking 1569 */ 1570 #if 1 // defined(__KDEBUGALL) 1571 1572 #define ASSERT(X) \ 1573 do { \ 1574 if (unlikely(!(X))) { \ 1575 printk(KERN_ERR "\n"); \ 1576 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1577 BUG(); \ 1578 } \ 1579 } while(0) 1580 1581 #define ASSERTCMP(X, OP, Y) \ 1582 do { \ 1583 if (unlikely(!((X) OP (Y)))) { \ 1584 printk(KERN_ERR "\n"); \ 1585 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1586 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1587 (unsigned long)(X), (unsigned long)(Y)); \ 1588 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1589 (unsigned long)(X), (unsigned long)(Y)); \ 1590 BUG(); \ 1591 } \ 1592 } while(0) 1593 1594 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1595 do { \ 1596 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1597 printk(KERN_ERR "\n"); \ 1598 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1599 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1600 (unsigned long)(L), (unsigned long)(N), \ 1601 (unsigned long)(H)); \ 1602 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1603 (unsigned long)(L), (unsigned long)(N), \ 1604 (unsigned long)(H)); \ 1605 BUG(); \ 1606 } \ 1607 } while(0) 1608 1609 #define ASSERTIF(C, X) \ 1610 do { \ 1611 if (unlikely((C) && !(X))) { \ 1612 printk(KERN_ERR "\n"); \ 1613 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1614 BUG(); \ 1615 } \ 1616 } while(0) 1617 1618 #define ASSERTIFCMP(C, X, OP, Y) \ 1619 do { \ 1620 if (unlikely((C) && !((X) OP (Y)))) { \ 1621 printk(KERN_ERR "\n"); \ 1622 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1623 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1624 (unsigned long)(X), (unsigned long)(Y)); \ 1625 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1626 (unsigned long)(X), (unsigned long)(Y)); \ 1627 BUG(); \ 1628 } \ 1629 } while(0) 1630 1631 #else 1632 1633 #define ASSERT(X) \ 1634 do { \ 1635 } while(0) 1636 1637 #define ASSERTCMP(X, OP, Y) \ 1638 do { \ 1639 } while(0) 1640 1641 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1642 do { \ 1643 } while(0) 1644 1645 #define ASSERTIF(C, X) \ 1646 do { \ 1647 } while(0) 1648 1649 #define ASSERTIFCMP(C, X, OP, Y) \ 1650 do { \ 1651 } while(0) 1652 1653 #endif /* __KDEBUGALL */ 1654