1 /* internal AFS stuff 2 * 3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/compiler.h> 13 #include <linux/kernel.h> 14 #include <linux/ktime.h> 15 #include <linux/fs.h> 16 #include <linux/pagemap.h> 17 #include <linux/rxrpc.h> 18 #include <linux/key.h> 19 #include <linux/workqueue.h> 20 #include <linux/sched.h> 21 #include <linux/fscache.h> 22 #include <linux/backing-dev.h> 23 #include <linux/uuid.h> 24 #include <linux/mm_types.h> 25 #include <linux/dns_resolver.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/sock.h> 29 #include <net/af_rxrpc.h> 30 31 #include "afs.h" 32 #include "afs_vl.h" 33 34 #define AFS_CELL_MAX_ADDRS 15 35 36 struct pagevec; 37 struct afs_call; 38 39 /* 40 * Partial file-locking emulation mode. (The problem being that AFS3 only 41 * allows whole-file locks and no upgrading/downgrading). 42 */ 43 enum afs_flock_mode { 44 afs_flock_mode_unset, 45 afs_flock_mode_local, /* Local locking only */ 46 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */ 47 afs_flock_mode_strict, /* Always get a server lock for a partial lock */ 48 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */ 49 }; 50 51 struct afs_fs_context { 52 bool force; /* T to force cell type */ 53 bool autocell; /* T if set auto mount operation */ 54 bool dyn_root; /* T if dynamic root */ 55 bool no_cell; /* T if the source is "none" (for dynroot) */ 56 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */ 57 afs_voltype_t type; /* type of volume requested */ 58 unsigned int volnamesz; /* size of volume name */ 59 const char *volname; /* name of volume to mount */ 60 struct afs_net *net; /* the AFS net namespace stuff */ 61 struct afs_cell *cell; /* cell in which to find volume */ 62 struct afs_volume *volume; /* volume record */ 63 struct key *key; /* key to use for secure mounting */ 64 }; 65 66 struct afs_iget_data { 67 struct afs_fid fid; 68 struct afs_volume *volume; /* volume on which resides */ 69 unsigned int cb_v_break; /* Pre-fetch volume break count */ 70 unsigned int cb_s_break; /* Pre-fetch server break count */ 71 }; 72 73 enum afs_call_state { 74 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */ 75 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */ 76 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */ 77 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */ 78 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */ 79 AFS_CALL_SV_REPLYING, /* Server: Replying */ 80 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */ 81 AFS_CALL_COMPLETE, /* Completed or failed */ 82 }; 83 84 /* 85 * List of server addresses. 86 */ 87 struct afs_addr_list { 88 struct rcu_head rcu; /* Must be first */ 89 refcount_t usage; 90 u32 version; /* Version */ 91 unsigned char max_addrs; 92 unsigned char nr_addrs; 93 unsigned char preferred; /* Preferred address */ 94 unsigned char nr_ipv4; /* Number of IPv4 addresses */ 95 enum dns_record_source source:8; 96 enum dns_lookup_status status:8; 97 unsigned long probed; /* Mask of servers that have been probed */ 98 unsigned long failed; /* Mask of addrs that failed locally/ICMP */ 99 unsigned long responded; /* Mask of addrs that responded */ 100 struct sockaddr_rxrpc addrs[]; 101 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) 102 }; 103 104 /* 105 * a record of an in-progress RxRPC call 106 */ 107 struct afs_call { 108 const struct afs_call_type *type; /* type of call */ 109 struct afs_addr_list *alist; /* Address is alist[addr_ix] */ 110 wait_queue_head_t waitq; /* processes awaiting completion */ 111 struct work_struct async_work; /* async I/O processor */ 112 struct work_struct work; /* actual work processor */ 113 struct rxrpc_call *rxcall; /* RxRPC call handle */ 114 struct key *key; /* security for this call */ 115 struct afs_net *net; /* The network namespace */ 116 union { 117 struct afs_server *server; 118 struct afs_vlserver *vlserver; 119 }; 120 struct afs_cb_interest *cbi; /* Callback interest for server used */ 121 struct afs_vnode *lvnode; /* vnode being locked */ 122 void *request; /* request data (first part) */ 123 struct address_space *mapping; /* Pages being written from */ 124 struct iov_iter iter; /* Buffer iterator */ 125 struct iov_iter *_iter; /* Iterator currently in use */ 126 union { /* Convenience for ->iter */ 127 struct kvec kvec[1]; 128 struct bio_vec bvec[1]; 129 }; 130 void *buffer; /* reply receive buffer */ 131 union { 132 long ret0; /* Value to reply with instead of 0 */ 133 struct afs_addr_list *ret_alist; 134 struct afs_vldb_entry *ret_vldb; 135 struct afs_acl *ret_acl; 136 }; 137 struct afs_fid *out_fid; 138 struct afs_status_cb *out_dir_scb; 139 struct afs_status_cb *out_scb; 140 struct yfs_acl *out_yacl; 141 struct afs_volsync *out_volsync; 142 struct afs_volume_status *out_volstatus; 143 struct afs_read *read_request; 144 unsigned int server_index; 145 pgoff_t first; /* first page in mapping to deal with */ 146 pgoff_t last; /* last page in mapping to deal with */ 147 atomic_t usage; 148 enum afs_call_state state; 149 spinlock_t state_lock; 150 int error; /* error code */ 151 u32 abort_code; /* Remote abort ID or 0 */ 152 u32 epoch; 153 unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */ 154 unsigned request_size; /* size of request data */ 155 unsigned reply_max; /* maximum size of reply */ 156 unsigned first_offset; /* offset into mapping[first] */ 157 union { 158 unsigned last_to; /* amount of mapping[last] */ 159 unsigned count2; /* count used in unmarshalling */ 160 }; 161 unsigned char unmarshall; /* unmarshalling phase */ 162 unsigned char addr_ix; /* Address in ->alist */ 163 bool incoming; /* T if incoming call */ 164 bool send_pages; /* T if data from mapping should be sent */ 165 bool need_attention; /* T if RxRPC poked us */ 166 bool async; /* T if asynchronous */ 167 bool upgrade; /* T to request service upgrade */ 168 bool have_reply_time; /* T if have got reply_time */ 169 bool intr; /* T if interruptible */ 170 u16 service_id; /* Actual service ID (after upgrade) */ 171 unsigned int debug_id; /* Trace ID */ 172 u32 operation_ID; /* operation ID for an incoming call */ 173 u32 count; /* count for use in unmarshalling */ 174 union { /* place to extract temporary data */ 175 struct { 176 __be32 tmp_u; 177 __be32 tmp; 178 } __attribute__((packed)); 179 __be64 tmp64; 180 }; 181 ktime_t reply_time; /* Time of first reply packet */ 182 }; 183 184 struct afs_call_type { 185 const char *name; 186 unsigned int op; /* Really enum afs_fs_operation */ 187 188 /* deliver request or reply data to an call 189 * - returning an error will cause the call to be aborted 190 */ 191 int (*deliver)(struct afs_call *call); 192 193 /* clean up a call */ 194 void (*destructor)(struct afs_call *call); 195 196 /* Work function */ 197 void (*work)(struct work_struct *work); 198 199 /* Call done function (gets called immediately on success or failure) */ 200 void (*done)(struct afs_call *call); 201 }; 202 203 /* 204 * Key available for writeback on a file. 205 */ 206 struct afs_wb_key { 207 refcount_t usage; 208 struct key *key; 209 struct list_head vnode_link; /* Link in vnode->wb_keys */ 210 }; 211 212 /* 213 * AFS open file information record. Pointed to by file->private_data. 214 */ 215 struct afs_file { 216 struct key *key; /* The key this file was opened with */ 217 struct afs_wb_key *wb; /* Writeback key record for this file */ 218 }; 219 220 static inline struct key *afs_file_key(struct file *file) 221 { 222 struct afs_file *af = file->private_data; 223 224 return af->key; 225 } 226 227 /* 228 * Record of an outstanding read operation on a vnode. 229 */ 230 struct afs_read { 231 loff_t pos; /* Where to start reading */ 232 loff_t len; /* How much we're asking for */ 233 loff_t actual_len; /* How much we're actually getting */ 234 loff_t remain; /* Amount remaining */ 235 loff_t file_size; /* File size returned by server */ 236 afs_dataversion_t data_version; /* Version number returned by server */ 237 refcount_t usage; 238 unsigned int index; /* Which page we're reading into */ 239 unsigned int nr_pages; 240 unsigned int offset; /* offset into current page */ 241 struct afs_vnode *vnode; 242 void (*page_done)(struct afs_read *); 243 struct page **pages; 244 struct page *array[]; 245 }; 246 247 /* 248 * AFS superblock private data 249 * - there's one superblock per volume 250 */ 251 struct afs_super_info { 252 struct net *net_ns; /* Network namespace */ 253 struct afs_cell *cell; /* The cell in which the volume resides */ 254 struct afs_volume *volume; /* volume record */ 255 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 256 bool dyn_root; /* True if dynamic root */ 257 }; 258 259 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 260 { 261 return sb->s_fs_info; 262 } 263 264 extern struct file_system_type afs_fs_type; 265 266 /* 267 * Set of substitutes for @sys. 268 */ 269 struct afs_sysnames { 270 #define AFS_NR_SYSNAME 16 271 char *subs[AFS_NR_SYSNAME]; 272 refcount_t usage; 273 unsigned short nr; 274 char blank[1]; 275 }; 276 277 /* 278 * AFS network namespace record. 279 */ 280 struct afs_net { 281 struct net *net; /* Backpointer to the owning net namespace */ 282 struct afs_uuid uuid; 283 bool live; /* F if this namespace is being removed */ 284 285 /* AF_RXRPC I/O stuff */ 286 struct socket *socket; 287 struct afs_call *spare_incoming_call; 288 struct work_struct charge_preallocation_work; 289 struct mutex socket_mutex; 290 atomic_t nr_outstanding_calls; 291 atomic_t nr_superblocks; 292 293 /* Cell database */ 294 struct rb_root cells; 295 struct afs_cell __rcu *ws_cell; 296 struct work_struct cells_manager; 297 struct timer_list cells_timer; 298 atomic_t cells_outstanding; 299 seqlock_t cells_lock; 300 301 struct mutex proc_cells_lock; 302 struct hlist_head proc_cells; 303 304 /* Known servers. Theoretically each fileserver can only be in one 305 * cell, but in practice, people create aliases and subsets and there's 306 * no easy way to distinguish them. 307 */ 308 seqlock_t fs_lock; /* For fs_servers */ 309 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 310 struct list_head fs_updates; /* afs_server (by update_at) */ 311 struct hlist_head fs_proc; /* procfs servers list */ 312 313 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 314 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 315 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 316 317 struct work_struct fs_manager; 318 struct timer_list fs_timer; 319 atomic_t servers_outstanding; 320 321 /* File locking renewal management */ 322 struct mutex lock_manager_mutex; 323 324 /* Misc */ 325 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 326 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 327 struct afs_sysnames *sysnames; 328 rwlock_t sysnames_lock; 329 330 /* Statistics counters */ 331 atomic_t n_lookup; /* Number of lookups done */ 332 atomic_t n_reval; /* Number of dentries needing revalidation */ 333 atomic_t n_inval; /* Number of invalidations by the server */ 334 atomic_t n_relpg; /* Number of invalidations by releasepage */ 335 atomic_t n_read_dir; /* Number of directory pages read */ 336 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 337 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 338 atomic_t n_stores; /* Number of store ops */ 339 atomic_long_t n_store_bytes; /* Number of bytes stored */ 340 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 341 atomic_t n_fetches; /* Number of data fetch ops */ 342 }; 343 344 extern const char afs_init_sysname[]; 345 346 enum afs_cell_state { 347 AFS_CELL_UNSET, 348 AFS_CELL_ACTIVATING, 349 AFS_CELL_ACTIVE, 350 AFS_CELL_DEACTIVATING, 351 AFS_CELL_INACTIVE, 352 AFS_CELL_FAILED, 353 }; 354 355 /* 356 * AFS cell record. 357 * 358 * This is a tricky concept to get right as it is possible to create aliases 359 * simply by pointing AFSDB/SRV records for two names at the same set of VL 360 * servers; it is also possible to do things like setting up two sets of VL 361 * servers, one of which provides a superset of the volumes provided by the 362 * other (for internal/external division, for example). 363 * 364 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 365 * servers and (b) a cell's name is used by the client to select the key to use 366 * for authentication and encryption. The cell name is not typically used in 367 * the protocol. 368 * 369 * There is no easy way to determine if two cells are aliases or one is a 370 * subset of another. 371 */ 372 struct afs_cell { 373 union { 374 struct rcu_head rcu; 375 struct rb_node net_node; /* Node in net->cells */ 376 }; 377 struct afs_net *net; 378 struct key *anonymous_key; /* anonymous user key for this cell */ 379 struct work_struct manager; /* Manager for init/deinit/dns */ 380 struct hlist_node proc_link; /* /proc cell list link */ 381 #ifdef CONFIG_AFS_FSCACHE 382 struct fscache_cookie *cache; /* caching cookie */ 383 #endif 384 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 385 time64_t last_inactive; /* Time of last drop of usage count */ 386 atomic_t usage; 387 unsigned long flags; 388 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 389 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 390 enum afs_cell_state state; 391 short error; 392 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 393 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 394 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 395 396 /* Active fileserver interaction state. */ 397 struct list_head proc_volumes; /* procfs volume list */ 398 rwlock_t proc_lock; 399 400 /* VL server list. */ 401 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 402 struct afs_vlserver_list __rcu *vl_servers; 403 404 u8 name_len; /* Length of name */ 405 char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */ 406 }; 407 408 /* 409 * Volume Location server record. 410 */ 411 struct afs_vlserver { 412 struct rcu_head rcu; 413 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 414 unsigned long flags; 415 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 416 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 417 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 418 rwlock_t lock; /* Lock on addresses */ 419 atomic_t usage; 420 421 /* Probe state */ 422 wait_queue_head_t probe_wq; 423 atomic_t probe_outstanding; 424 spinlock_t probe_lock; 425 struct { 426 unsigned int rtt; /* RTT as ktime/64 */ 427 u32 abort_code; 428 short error; 429 bool have_result; 430 bool responded:1; 431 bool is_yfs:1; 432 bool not_yfs:1; 433 bool local_failure:1; 434 } probe; 435 436 u16 port; 437 u16 name_len; /* Length of name */ 438 char name[]; /* Server name, case-flattened */ 439 }; 440 441 /* 442 * Weighted list of Volume Location servers. 443 */ 444 struct afs_vlserver_entry { 445 u16 priority; /* Preference (as SRV) */ 446 u16 weight; /* Weight (as SRV) */ 447 enum dns_record_source source:8; 448 enum dns_lookup_status status:8; 449 struct afs_vlserver *server; 450 }; 451 452 struct afs_vlserver_list { 453 struct rcu_head rcu; 454 atomic_t usage; 455 u8 nr_servers; 456 u8 index; /* Server currently in use */ 457 u8 preferred; /* Preferred server */ 458 enum dns_record_source source:8; 459 enum dns_lookup_status status:8; 460 rwlock_t lock; 461 struct afs_vlserver_entry servers[]; 462 }; 463 464 /* 465 * Cached VLDB entry. 466 * 467 * This is pointed to by cell->vldb_entries, indexed by name. 468 */ 469 struct afs_vldb_entry { 470 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 471 472 unsigned long flags; 473 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 474 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 475 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 476 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 477 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 478 479 uuid_t fs_server[AFS_NMAXNSERVERS]; 480 u8 fs_mask[AFS_NMAXNSERVERS]; 481 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 482 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 483 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 484 short error; 485 u8 nr_servers; /* Number of server records */ 486 u8 name_len; 487 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 488 }; 489 490 /* 491 * Record of fileserver with which we're actively communicating. 492 */ 493 struct afs_server { 494 struct rcu_head rcu; 495 union { 496 uuid_t uuid; /* Server ID */ 497 struct afs_uuid _uuid; 498 }; 499 500 struct afs_addr_list __rcu *addresses; 501 struct rb_node uuid_rb; /* Link in net->servers */ 502 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 503 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 504 struct hlist_node proc_link; /* Link in net->fs_proc */ 505 struct afs_server *gc_next; /* Next server in manager's list */ 506 time64_t put_time; /* Time at which last put */ 507 time64_t update_at; /* Time at which to next update the record */ 508 unsigned long flags; 509 #define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */ 510 #define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */ 511 #define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */ 512 #define AFS_SERVER_FL_UPDATING 4 513 #define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */ 514 #define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */ 515 #define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */ 516 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 517 #define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */ 518 #define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */ 519 #define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */ 520 atomic_t usage; 521 u32 addr_version; /* Address list version */ 522 u32 cm_epoch; /* Server RxRPC epoch */ 523 524 /* file service access */ 525 rwlock_t fs_lock; /* access lock */ 526 527 /* callback promise management */ 528 struct hlist_head cb_volumes; /* List of volume interests on this server */ 529 unsigned cb_s_break; /* Break-everything counter. */ 530 rwlock_t cb_break_lock; /* Volume finding lock */ 531 532 /* Probe state */ 533 wait_queue_head_t probe_wq; 534 atomic_t probe_outstanding; 535 spinlock_t probe_lock; 536 struct { 537 unsigned int rtt; /* RTT as ktime/64 */ 538 u32 abort_code; 539 u32 cm_epoch; 540 short error; 541 bool have_result; 542 bool responded:1; 543 bool is_yfs:1; 544 bool not_yfs:1; 545 bool local_failure:1; 546 bool no_epoch:1; 547 bool cm_probed:1; 548 bool said_rebooted:1; 549 bool said_inconsistent:1; 550 } probe; 551 }; 552 553 /* 554 * Volume collation in the server's callback interest list. 555 */ 556 struct afs_vol_interest { 557 struct hlist_node srv_link; /* Link in server->cb_volumes */ 558 struct hlist_head cb_interests; /* List of callback interests on the server */ 559 union { 560 struct rcu_head rcu; 561 afs_volid_t vid; /* Volume ID to match */ 562 }; 563 unsigned int usage; 564 }; 565 566 /* 567 * Interest by a superblock on a server. 568 */ 569 struct afs_cb_interest { 570 struct hlist_node cb_vlink; /* Link in vol_interest->cb_interests */ 571 struct afs_vol_interest *vol_interest; 572 struct afs_server *server; /* Server on which this interest resides */ 573 struct super_block *sb; /* Superblock on which inodes reside */ 574 union { 575 struct rcu_head rcu; 576 afs_volid_t vid; /* Volume ID to match */ 577 }; 578 refcount_t usage; 579 }; 580 581 /* 582 * Replaceable server list. 583 */ 584 struct afs_server_entry { 585 struct afs_server *server; 586 struct afs_cb_interest *cb_interest; 587 }; 588 589 struct afs_server_list { 590 refcount_t usage; 591 unsigned char nr_servers; 592 unsigned char preferred; /* Preferred server */ 593 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 594 unsigned int seq; /* Set to ->servers_seq when installed */ 595 rwlock_t lock; 596 struct afs_server_entry servers[]; 597 }; 598 599 /* 600 * Live AFS volume management. 601 */ 602 struct afs_volume { 603 afs_volid_t vid; /* volume ID */ 604 atomic_t usage; 605 time64_t update_at; /* Time at which to next update */ 606 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 607 struct list_head proc_link; /* Link in cell->vl_proc */ 608 unsigned long flags; 609 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 610 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 611 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 612 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 613 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 614 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 615 #ifdef CONFIG_AFS_FSCACHE 616 struct fscache_cookie *cache; /* caching cookie */ 617 #endif 618 struct afs_server_list *servers; /* List of servers on which volume resides */ 619 rwlock_t servers_lock; /* Lock for ->servers */ 620 unsigned int servers_seq; /* Incremented each time ->servers changes */ 621 622 unsigned cb_v_break; /* Break-everything counter. */ 623 rwlock_t cb_break_lock; 624 625 afs_voltype_t type; /* type of volume */ 626 short error; 627 char type_force; /* force volume type (suppress R/O -> R/W) */ 628 u8 name_len; 629 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 630 }; 631 632 enum afs_lock_state { 633 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 634 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 635 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 636 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 637 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 638 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 639 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 640 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 641 }; 642 643 /* 644 * AFS inode private data. 645 * 646 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 647 * leak from one inode to another. 648 */ 649 struct afs_vnode { 650 struct inode vfs_inode; /* the VFS's inode record */ 651 652 struct afs_volume *volume; /* volume on which vnode resides */ 653 struct afs_fid fid; /* the file identifier for this inode */ 654 struct afs_file_status status; /* AFS status info for this file */ 655 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 656 #ifdef CONFIG_AFS_FSCACHE 657 struct fscache_cookie *cache; /* caching cookie */ 658 #endif 659 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 660 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 661 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 662 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 663 struct key *silly_key; /* Silly rename key */ 664 spinlock_t wb_lock; /* lock for wb_keys */ 665 spinlock_t lock; /* waitqueue/flags lock */ 666 unsigned long flags; 667 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 668 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 669 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 670 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 671 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 672 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 673 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 674 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 675 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 676 677 struct list_head wb_keys; /* List of keys available for writeback */ 678 struct list_head pending_locks; /* locks waiting to be granted */ 679 struct list_head granted_locks; /* locks granted on this file */ 680 struct delayed_work lock_work; /* work to be done in locking */ 681 struct key *lock_key; /* Key to be used in lock ops */ 682 ktime_t locked_at; /* Time at which lock obtained */ 683 enum afs_lock_state lock_state : 8; 684 afs_lock_type_t lock_type : 8; 685 686 /* outstanding callback notification on this file */ 687 struct afs_cb_interest __rcu *cb_interest; /* Server on which this resides */ 688 unsigned int cb_s_break; /* Mass break counter on ->server */ 689 unsigned int cb_v_break; /* Mass break counter on ->volume */ 690 unsigned int cb_break; /* Break counter on vnode */ 691 seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */ 692 693 time64_t cb_expires_at; /* time at which callback expires */ 694 }; 695 696 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 697 { 698 #ifdef CONFIG_AFS_FSCACHE 699 return vnode->cache; 700 #else 701 return NULL; 702 #endif 703 } 704 705 /* 706 * cached security record for one user's attempt to access a vnode 707 */ 708 struct afs_permit { 709 struct key *key; /* RxRPC ticket holding a security context */ 710 afs_access_t access; /* CallerAccess value for this key */ 711 }; 712 713 /* 714 * Immutable cache of CallerAccess records from attempts to access vnodes. 715 * These may be shared between multiple vnodes. 716 */ 717 struct afs_permits { 718 struct rcu_head rcu; 719 struct hlist_node hash_node; /* Link in hash */ 720 unsigned long h; /* Hash value for this permit list */ 721 refcount_t usage; 722 unsigned short nr_permits; /* Number of records */ 723 bool invalidated; /* Invalidated due to key change */ 724 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 725 }; 726 727 /* 728 * Error prioritisation and accumulation. 729 */ 730 struct afs_error { 731 short error; /* Accumulated error */ 732 bool responded; /* T if server responded */ 733 }; 734 735 /* 736 * Cursor for iterating over a server's address list. 737 */ 738 struct afs_addr_cursor { 739 struct afs_addr_list *alist; /* Current address list (pins ref) */ 740 unsigned long tried; /* Tried addresses */ 741 signed char index; /* Current address */ 742 bool responded; /* T if the current address responded */ 743 unsigned short nr_iterations; /* Number of address iterations */ 744 short error; 745 u32 abort_code; 746 }; 747 748 /* 749 * Cursor for iterating over a set of volume location servers. 750 */ 751 struct afs_vl_cursor { 752 struct afs_addr_cursor ac; 753 struct afs_cell *cell; /* The cell we're querying */ 754 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 755 struct afs_vlserver *server; /* Server on which this resides */ 756 struct key *key; /* Key for the server */ 757 unsigned long untried; /* Bitmask of untried servers */ 758 short index; /* Current server */ 759 short error; 760 unsigned short flags; 761 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 762 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 763 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 764 unsigned short nr_iterations; /* Number of server iterations */ 765 }; 766 767 /* 768 * Cursor for iterating over a set of fileservers. 769 */ 770 struct afs_fs_cursor { 771 const struct afs_call_type *type; /* Type of call done */ 772 struct afs_addr_cursor ac; 773 struct afs_vnode *vnode; 774 struct afs_server_list *server_list; /* Current server list (pins ref) */ 775 struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */ 776 struct key *key; /* Key for the server */ 777 unsigned long untried; /* Bitmask of untried servers */ 778 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 779 unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */ 780 short index; /* Current server */ 781 short error; 782 unsigned short flags; 783 #define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */ 784 #define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */ 785 #define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */ 786 #define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */ 787 #define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 788 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 789 #define AFS_FS_CURSOR_INTR 0x0040 /* Set if op is interruptible */ 790 unsigned short nr_iterations; /* Number of server iterations */ 791 }; 792 793 /* 794 * Cache auxiliary data. 795 */ 796 struct afs_vnode_cache_aux { 797 u64 data_version; 798 } __packed; 799 800 #include <trace/events/afs.h> 801 802 /*****************************************************************************/ 803 /* 804 * addr_list.c 805 */ 806 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 807 { 808 if (alist) 809 refcount_inc(&alist->usage); 810 return alist; 811 } 812 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 813 unsigned short, 814 unsigned short); 815 extern void afs_put_addrlist(struct afs_addr_list *); 816 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 817 const char *, size_t, char, 818 unsigned short, unsigned short); 819 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 820 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 821 extern int afs_end_cursor(struct afs_addr_cursor *); 822 823 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 824 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 825 826 /* 827 * cache.c 828 */ 829 #ifdef CONFIG_AFS_FSCACHE 830 extern struct fscache_netfs afs_cache_netfs; 831 extern struct fscache_cookie_def afs_cell_cache_index_def; 832 extern struct fscache_cookie_def afs_volume_cache_index_def; 833 extern struct fscache_cookie_def afs_vnode_cache_index_def; 834 #else 835 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 836 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 837 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 838 #endif 839 840 /* 841 * callback.c 842 */ 843 extern void afs_init_callback_state(struct afs_server *); 844 extern void __afs_break_callback(struct afs_vnode *); 845 extern void afs_break_callback(struct afs_vnode *); 846 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*); 847 848 extern int afs_register_server_cb_interest(struct afs_vnode *, 849 struct afs_server_list *, unsigned int); 850 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *); 851 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *); 852 853 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi) 854 { 855 if (cbi) 856 refcount_inc(&cbi->usage); 857 return cbi; 858 } 859 860 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 861 { 862 return vnode->cb_break + vnode->cb_v_break; 863 } 864 865 static inline bool afs_cb_is_broken(unsigned int cb_break, 866 const struct afs_vnode *vnode, 867 const struct afs_cb_interest *cbi) 868 { 869 return !cbi || cb_break != (vnode->cb_break + 870 vnode->volume->cb_v_break); 871 } 872 873 /* 874 * cell.c 875 */ 876 extern int afs_cell_init(struct afs_net *, const char *); 877 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 878 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 879 const char *, bool); 880 extern struct afs_cell *afs_get_cell(struct afs_cell *); 881 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 882 extern void afs_manage_cells(struct work_struct *); 883 extern void afs_cells_timer(struct timer_list *); 884 extern void __net_exit afs_cell_purge(struct afs_net *); 885 886 /* 887 * cmservice.c 888 */ 889 extern bool afs_cm_incoming_call(struct afs_call *); 890 891 /* 892 * dir.c 893 */ 894 extern const struct file_operations afs_dir_file_operations; 895 extern const struct inode_operations afs_dir_inode_operations; 896 extern const struct address_space_operations afs_dir_aops; 897 extern const struct dentry_operations afs_fs_dentry_operations; 898 899 extern void afs_d_release(struct dentry *); 900 901 /* 902 * dir_edit.c 903 */ 904 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 905 enum afs_edit_dir_reason); 906 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 907 908 /* 909 * dir_silly.c 910 */ 911 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 912 struct dentry *, struct key *); 913 extern int afs_silly_iput(struct dentry *, struct inode *); 914 915 /* 916 * dynroot.c 917 */ 918 extern const struct file_operations afs_dynroot_file_operations; 919 extern const struct inode_operations afs_dynroot_inode_operations; 920 extern const struct dentry_operations afs_dynroot_dentry_operations; 921 922 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 923 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 924 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 925 extern int afs_dynroot_populate(struct super_block *); 926 extern void afs_dynroot_depopulate(struct super_block *); 927 928 /* 929 * file.c 930 */ 931 extern const struct address_space_operations afs_fs_aops; 932 extern const struct inode_operations afs_file_inode_operations; 933 extern const struct file_operations afs_file_operations; 934 935 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 936 extern void afs_put_wb_key(struct afs_wb_key *); 937 extern int afs_open(struct inode *, struct file *); 938 extern int afs_release(struct inode *, struct file *); 939 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 940 extern int afs_page_filler(void *, struct page *); 941 extern void afs_put_read(struct afs_read *); 942 943 /* 944 * flock.c 945 */ 946 extern struct workqueue_struct *afs_lock_manager; 947 948 extern void afs_lock_op_done(struct afs_call *); 949 extern void afs_lock_work(struct work_struct *); 950 extern void afs_lock_may_be_available(struct afs_vnode *); 951 extern int afs_lock(struct file *, int, struct file_lock *); 952 extern int afs_flock(struct file *, int, struct file_lock *); 953 954 /* 955 * fsclient.c 956 */ 957 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *, 958 struct afs_volsync *); 959 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *); 960 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *); 961 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t, 962 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *); 963 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, 964 struct afs_status_cb *); 965 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, 966 struct afs_status_cb *, struct afs_status_cb *); 967 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, 968 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *); 969 extern int afs_fs_rename(struct afs_fs_cursor *, const char *, 970 struct afs_vnode *, const char *, 971 struct afs_status_cb *, struct afs_status_cb *); 972 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 973 pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *); 974 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *); 975 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 976 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *); 977 extern int afs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *); 978 extern int afs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *); 979 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 980 struct afs_addr_cursor *, struct key *); 981 extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 982 struct afs_addr_cursor *, struct key *, 983 unsigned int); 984 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 985 struct afs_fid *, struct afs_status_cb *, 986 unsigned int, struct afs_volsync *); 987 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 988 struct afs_fid *, struct afs_status_cb *, 989 struct afs_volsync *); 990 991 struct afs_acl { 992 u32 size; 993 u8 data[]; 994 }; 995 996 extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *, struct afs_status_cb *); 997 extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *, 998 struct afs_status_cb *); 999 1000 /* 1001 * fs_probe.c 1002 */ 1003 extern void afs_fileserver_probe_result(struct afs_call *); 1004 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *); 1005 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 1006 1007 /* 1008 * inode.c 1009 */ 1010 extern void afs_vnode_commit_status(struct afs_fs_cursor *, 1011 struct afs_vnode *, 1012 unsigned int, 1013 const afs_dataversion_t *, 1014 struct afs_status_cb *); 1015 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1016 extern int afs_iget5_test(struct inode *, void *); 1017 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1018 extern struct inode *afs_iget(struct super_block *, struct key *, 1019 struct afs_iget_data *, struct afs_status_cb *, 1020 struct afs_cb_interest *, 1021 struct afs_vnode *); 1022 extern void afs_zap_data(struct afs_vnode *); 1023 extern bool afs_check_validity(struct afs_vnode *); 1024 extern int afs_validate(struct afs_vnode *, struct key *); 1025 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1026 extern int afs_setattr(struct dentry *, struct iattr *); 1027 extern void afs_evict_inode(struct inode *); 1028 extern int afs_drop_inode(struct inode *); 1029 1030 /* 1031 * main.c 1032 */ 1033 extern struct workqueue_struct *afs_wq; 1034 extern int afs_net_id; 1035 1036 static inline struct afs_net *afs_net(struct net *net) 1037 { 1038 return net_generic(net, afs_net_id); 1039 } 1040 1041 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1042 { 1043 return afs_net(AFS_FS_S(sb)->net_ns); 1044 } 1045 1046 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1047 { 1048 return afs_sb2net(dentry->d_sb); 1049 } 1050 1051 static inline struct afs_net *afs_i2net(struct inode *inode) 1052 { 1053 return afs_sb2net(inode->i_sb); 1054 } 1055 1056 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1057 { 1058 return afs_i2net(&vnode->vfs_inode); 1059 } 1060 1061 static inline struct afs_net *afs_sock2net(struct sock *sk) 1062 { 1063 return net_generic(sock_net(sk), afs_net_id); 1064 } 1065 1066 static inline void __afs_stat(atomic_t *s) 1067 { 1068 atomic_inc(s); 1069 } 1070 1071 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1072 1073 /* 1074 * misc.c 1075 */ 1076 extern int afs_abort_to_error(u32); 1077 extern void afs_prioritise_error(struct afs_error *, int, u32); 1078 1079 /* 1080 * mntpt.c 1081 */ 1082 extern const struct inode_operations afs_mntpt_inode_operations; 1083 extern const struct inode_operations afs_autocell_inode_operations; 1084 extern const struct file_operations afs_mntpt_file_operations; 1085 1086 extern struct vfsmount *afs_d_automount(struct path *); 1087 extern void afs_mntpt_kill_timer(void); 1088 1089 /* 1090 * proc.c 1091 */ 1092 #ifdef CONFIG_PROC_FS 1093 extern int __net_init afs_proc_init(struct afs_net *); 1094 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1095 extern int afs_proc_cell_setup(struct afs_cell *); 1096 extern void afs_proc_cell_remove(struct afs_cell *); 1097 extern void afs_put_sysnames(struct afs_sysnames *); 1098 #else 1099 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1100 static inline void afs_proc_cleanup(struct afs_net *net) {} 1101 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1102 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1103 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1104 #endif 1105 1106 /* 1107 * rotate.c 1108 */ 1109 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *, 1110 struct key *, bool); 1111 extern bool afs_select_fileserver(struct afs_fs_cursor *); 1112 extern bool afs_select_current_fileserver(struct afs_fs_cursor *); 1113 extern int afs_end_vnode_operation(struct afs_fs_cursor *); 1114 1115 /* 1116 * rxrpc.c 1117 */ 1118 extern struct workqueue_struct *afs_async_calls; 1119 1120 extern int __net_init afs_open_socket(struct afs_net *); 1121 extern void __net_exit afs_close_socket(struct afs_net *); 1122 extern void afs_charge_preallocation(struct work_struct *); 1123 extern void afs_put_call(struct afs_call *); 1124 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1125 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1126 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1127 const struct afs_call_type *, 1128 size_t, size_t); 1129 extern void afs_flat_call_destructor(struct afs_call *); 1130 extern void afs_send_empty_reply(struct afs_call *); 1131 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1132 extern int afs_extract_data(struct afs_call *, bool); 1133 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause); 1134 1135 static inline void afs_set_fc_call(struct afs_call *call, struct afs_fs_cursor *fc) 1136 { 1137 call->intr = fc->flags & AFS_FS_CURSOR_INTR; 1138 fc->type = call->type; 1139 } 1140 1141 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1142 { 1143 call->kvec[0].iov_base = buf; 1144 call->kvec[0].iov_len = size; 1145 iov_iter_kvec(&call->iter, READ, call->kvec, 1, size); 1146 } 1147 1148 static inline void afs_extract_to_tmp(struct afs_call *call) 1149 { 1150 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1151 } 1152 1153 static inline void afs_extract_to_tmp64(struct afs_call *call) 1154 { 1155 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1156 } 1157 1158 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1159 { 1160 iov_iter_discard(&call->iter, READ, size); 1161 } 1162 1163 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1164 { 1165 afs_extract_begin(call, call->buffer, size); 1166 } 1167 1168 static inline int afs_transfer_reply(struct afs_call *call) 1169 { 1170 return afs_extract_data(call, false); 1171 } 1172 1173 static inline bool afs_check_call_state(struct afs_call *call, 1174 enum afs_call_state state) 1175 { 1176 return READ_ONCE(call->state) == state; 1177 } 1178 1179 static inline bool afs_set_call_state(struct afs_call *call, 1180 enum afs_call_state from, 1181 enum afs_call_state to) 1182 { 1183 bool ok = false; 1184 1185 spin_lock_bh(&call->state_lock); 1186 if (call->state == from) { 1187 call->state = to; 1188 trace_afs_call_state(call, from, to, 0, 0); 1189 ok = true; 1190 } 1191 spin_unlock_bh(&call->state_lock); 1192 return ok; 1193 } 1194 1195 static inline void afs_set_call_complete(struct afs_call *call, 1196 int error, u32 remote_abort) 1197 { 1198 enum afs_call_state state; 1199 bool ok = false; 1200 1201 spin_lock_bh(&call->state_lock); 1202 state = call->state; 1203 if (state != AFS_CALL_COMPLETE) { 1204 call->abort_code = remote_abort; 1205 call->error = error; 1206 call->state = AFS_CALL_COMPLETE; 1207 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1208 error, remote_abort); 1209 ok = true; 1210 } 1211 spin_unlock_bh(&call->state_lock); 1212 if (ok) 1213 trace_afs_call_done(call); 1214 } 1215 1216 /* 1217 * security.c 1218 */ 1219 extern void afs_put_permits(struct afs_permits *); 1220 extern void afs_clear_permits(struct afs_vnode *); 1221 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1222 struct afs_status_cb *); 1223 extern void afs_zap_permits(struct rcu_head *); 1224 extern struct key *afs_request_key(struct afs_cell *); 1225 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1226 extern int afs_permission(struct inode *, int); 1227 extern void __exit afs_clean_up_permit_cache(void); 1228 1229 /* 1230 * server.c 1231 */ 1232 extern spinlock_t afs_server_peer_lock; 1233 1234 static inline struct afs_server *afs_get_server(struct afs_server *server) 1235 { 1236 atomic_inc(&server->usage); 1237 return server; 1238 } 1239 1240 extern struct afs_server *afs_find_server(struct afs_net *, 1241 const struct sockaddr_rxrpc *); 1242 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1243 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *); 1244 extern void afs_put_server(struct afs_net *, struct afs_server *); 1245 extern void afs_manage_servers(struct work_struct *); 1246 extern void afs_servers_timer(struct timer_list *); 1247 extern void __net_exit afs_purge_servers(struct afs_net *); 1248 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *); 1249 1250 /* 1251 * server_list.c 1252 */ 1253 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1254 { 1255 refcount_inc(&slist->usage); 1256 return slist; 1257 } 1258 1259 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1260 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1261 struct afs_vldb_entry *, 1262 u8); 1263 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1264 1265 /* 1266 * super.c 1267 */ 1268 extern int __init afs_fs_init(void); 1269 extern void afs_fs_exit(void); 1270 1271 /* 1272 * vlclient.c 1273 */ 1274 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1275 const char *, int); 1276 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1277 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1278 struct key *, struct afs_vlserver *, unsigned int); 1279 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1280 1281 /* 1282 * vl_probe.c 1283 */ 1284 extern void afs_vlserver_probe_result(struct afs_call *); 1285 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1286 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1287 1288 /* 1289 * vl_rotate.c 1290 */ 1291 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1292 struct afs_cell *, struct key *); 1293 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1294 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1295 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1296 1297 /* 1298 * vlserver_list.c 1299 */ 1300 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1301 { 1302 atomic_inc(&vlserver->usage); 1303 return vlserver; 1304 } 1305 1306 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1307 { 1308 if (vllist) 1309 atomic_inc(&vllist->usage); 1310 return vllist; 1311 } 1312 1313 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1314 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1315 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1316 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1317 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1318 const void *, size_t); 1319 1320 /* 1321 * volume.c 1322 */ 1323 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume) 1324 { 1325 if (volume) 1326 atomic_inc(&volume->usage); 1327 return volume; 1328 } 1329 1330 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1331 extern void afs_activate_volume(struct afs_volume *); 1332 extern void afs_deactivate_volume(struct afs_volume *); 1333 extern void afs_put_volume(struct afs_cell *, struct afs_volume *); 1334 extern int afs_check_volume_status(struct afs_volume *, struct key *); 1335 1336 /* 1337 * write.c 1338 */ 1339 extern int afs_set_page_dirty(struct page *); 1340 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1341 loff_t pos, unsigned len, unsigned flags, 1342 struct page **pagep, void **fsdata); 1343 extern int afs_write_end(struct file *file, struct address_space *mapping, 1344 loff_t pos, unsigned len, unsigned copied, 1345 struct page *page, void *fsdata); 1346 extern int afs_writepage(struct page *, struct writeback_control *); 1347 extern int afs_writepages(struct address_space *, struct writeback_control *); 1348 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1349 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1350 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1351 extern void afs_prune_wb_keys(struct afs_vnode *); 1352 extern int afs_launder_page(struct page *); 1353 1354 /* 1355 * xattr.c 1356 */ 1357 extern const struct xattr_handler *afs_xattr_handlers[]; 1358 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1359 1360 /* 1361 * yfsclient.c 1362 */ 1363 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *, 1364 struct afs_volsync *); 1365 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *); 1366 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *, 1367 struct afs_fid *, struct afs_status_cb *); 1368 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *, 1369 struct afs_fid *, struct afs_status_cb *); 1370 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *, 1371 struct afs_status_cb *, struct afs_status_cb *); 1372 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, 1373 struct afs_status_cb *); 1374 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, 1375 struct afs_status_cb *, struct afs_status_cb *); 1376 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, 1377 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *); 1378 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, struct afs_vnode *, const char *, 1379 struct afs_status_cb *, struct afs_status_cb *); 1380 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 1381 pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *); 1382 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *); 1383 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 1384 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *); 1385 extern int yfs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *); 1386 extern int yfs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *); 1387 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 1388 struct afs_fid *, struct afs_status_cb *, 1389 struct afs_volsync *); 1390 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 1391 struct afs_fid *, struct afs_status_cb *, 1392 unsigned int, struct afs_volsync *); 1393 1394 struct yfs_acl { 1395 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1396 struct afs_acl *vol_acl; /* Whole volume ACL */ 1397 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1398 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1399 unsigned int flags; 1400 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1401 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1402 }; 1403 1404 extern void yfs_free_opaque_acl(struct yfs_acl *); 1405 extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, struct yfs_acl *, 1406 struct afs_status_cb *); 1407 extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *, 1408 struct afs_status_cb *); 1409 1410 /* 1411 * Miscellaneous inline functions. 1412 */ 1413 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1414 { 1415 return container_of(inode, struct afs_vnode, vfs_inode); 1416 } 1417 1418 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1419 { 1420 return &vnode->vfs_inode; 1421 } 1422 1423 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc, 1424 struct afs_vnode *vnode) 1425 { 1426 if (fc->ac.error == -ENOENT) { 1427 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1428 afs_break_callback(vnode); 1429 } 1430 } 1431 1432 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1433 { 1434 trace_afs_io_error(call->debug_id, -EIO, where); 1435 return -EIO; 1436 } 1437 1438 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1439 { 1440 trace_afs_file_error(vnode, -EIO, where); 1441 return -EIO; 1442 } 1443 1444 /*****************************************************************************/ 1445 /* 1446 * debug tracing 1447 */ 1448 extern unsigned afs_debug; 1449 1450 #define dbgprintk(FMT,...) \ 1451 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1452 1453 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1454 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1455 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1456 1457 1458 #if defined(__KDEBUG) 1459 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1460 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1461 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1462 1463 #elif defined(CONFIG_AFS_DEBUG) 1464 #define AFS_DEBUG_KENTER 0x01 1465 #define AFS_DEBUG_KLEAVE 0x02 1466 #define AFS_DEBUG_KDEBUG 0x04 1467 1468 #define _enter(FMT,...) \ 1469 do { \ 1470 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1471 kenter(FMT,##__VA_ARGS__); \ 1472 } while (0) 1473 1474 #define _leave(FMT,...) \ 1475 do { \ 1476 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1477 kleave(FMT,##__VA_ARGS__); \ 1478 } while (0) 1479 1480 #define _debug(FMT,...) \ 1481 do { \ 1482 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1483 kdebug(FMT,##__VA_ARGS__); \ 1484 } while (0) 1485 1486 #else 1487 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1488 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1489 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1490 #endif 1491 1492 /* 1493 * debug assertion checking 1494 */ 1495 #if 1 // defined(__KDEBUGALL) 1496 1497 #define ASSERT(X) \ 1498 do { \ 1499 if (unlikely(!(X))) { \ 1500 printk(KERN_ERR "\n"); \ 1501 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1502 BUG(); \ 1503 } \ 1504 } while(0) 1505 1506 #define ASSERTCMP(X, OP, Y) \ 1507 do { \ 1508 if (unlikely(!((X) OP (Y)))) { \ 1509 printk(KERN_ERR "\n"); \ 1510 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1511 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1512 (unsigned long)(X), (unsigned long)(Y)); \ 1513 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1514 (unsigned long)(X), (unsigned long)(Y)); \ 1515 BUG(); \ 1516 } \ 1517 } while(0) 1518 1519 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1520 do { \ 1521 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1522 printk(KERN_ERR "\n"); \ 1523 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1524 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1525 (unsigned long)(L), (unsigned long)(N), \ 1526 (unsigned long)(H)); \ 1527 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1528 (unsigned long)(L), (unsigned long)(N), \ 1529 (unsigned long)(H)); \ 1530 BUG(); \ 1531 } \ 1532 } while(0) 1533 1534 #define ASSERTIF(C, X) \ 1535 do { \ 1536 if (unlikely((C) && !(X))) { \ 1537 printk(KERN_ERR "\n"); \ 1538 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1539 BUG(); \ 1540 } \ 1541 } while(0) 1542 1543 #define ASSERTIFCMP(C, X, OP, Y) \ 1544 do { \ 1545 if (unlikely((C) && !((X) OP (Y)))) { \ 1546 printk(KERN_ERR "\n"); \ 1547 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1548 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1549 (unsigned long)(X), (unsigned long)(Y)); \ 1550 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1551 (unsigned long)(X), (unsigned long)(Y)); \ 1552 BUG(); \ 1553 } \ 1554 } while(0) 1555 1556 #else 1557 1558 #define ASSERT(X) \ 1559 do { \ 1560 } while(0) 1561 1562 #define ASSERTCMP(X, OP, Y) \ 1563 do { \ 1564 } while(0) 1565 1566 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1567 do { \ 1568 } while(0) 1569 1570 #define ASSERTIF(C, X) \ 1571 do { \ 1572 } while(0) 1573 1574 #define ASSERTIFCMP(C, X, OP, Y) \ 1575 do { \ 1576 } while(0) 1577 1578 #endif /* __KDEBUGALL */ 1579