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 }; 70 71 enum afs_call_state { 72 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */ 73 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */ 74 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */ 75 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */ 76 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */ 77 AFS_CALL_SV_REPLYING, /* Server: Replying */ 78 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */ 79 AFS_CALL_COMPLETE, /* Completed or failed */ 80 }; 81 82 /* 83 * List of server addresses. 84 */ 85 struct afs_addr_list { 86 struct rcu_head rcu; /* Must be first */ 87 refcount_t usage; 88 u32 version; /* Version */ 89 unsigned char max_addrs; 90 unsigned char nr_addrs; 91 unsigned char preferred; /* Preferred address */ 92 unsigned char nr_ipv4; /* Number of IPv4 addresses */ 93 enum dns_record_source source:8; 94 enum dns_lookup_status status:8; 95 unsigned long probed; /* Mask of servers that have been probed */ 96 unsigned long failed; /* Mask of addrs that failed locally/ICMP */ 97 unsigned long responded; /* Mask of addrs that responded */ 98 struct sockaddr_rxrpc addrs[]; 99 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) 100 }; 101 102 /* 103 * a record of an in-progress RxRPC call 104 */ 105 struct afs_call { 106 const struct afs_call_type *type; /* type of call */ 107 struct afs_addr_list *alist; /* Address is alist[addr_ix] */ 108 wait_queue_head_t waitq; /* processes awaiting completion */ 109 struct work_struct async_work; /* async I/O processor */ 110 struct work_struct work; /* actual work processor */ 111 struct rxrpc_call *rxcall; /* RxRPC call handle */ 112 struct key *key; /* security for this call */ 113 struct afs_net *net; /* The network namespace */ 114 struct afs_server *cm_server; /* Server affected by incoming CM call */ 115 struct afs_cb_interest *cbi; /* Callback interest for server used */ 116 void *request; /* request data (first part) */ 117 struct address_space *mapping; /* Pages being written from */ 118 struct iov_iter iter; /* Buffer iterator */ 119 struct iov_iter *_iter; /* Iterator currently in use */ 120 union { /* Convenience for ->iter */ 121 struct kvec kvec[1]; 122 struct bio_vec bvec[1]; 123 }; 124 void *buffer; /* reply receive buffer */ 125 void *reply[4]; /* Where to put the reply */ 126 pgoff_t first; /* first page in mapping to deal with */ 127 pgoff_t last; /* last page in mapping to deal with */ 128 atomic_t usage; 129 enum afs_call_state state; 130 spinlock_t state_lock; 131 int error; /* error code */ 132 u32 abort_code; /* Remote abort ID or 0 */ 133 u32 epoch; 134 unsigned request_size; /* size of request data */ 135 unsigned reply_max; /* maximum size of reply */ 136 unsigned first_offset; /* offset into mapping[first] */ 137 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 138 union { 139 unsigned last_to; /* amount of mapping[last] */ 140 unsigned count2; /* count used in unmarshalling */ 141 }; 142 unsigned char unmarshall; /* unmarshalling phase */ 143 unsigned char addr_ix; /* Address in ->alist */ 144 bool incoming; /* T if incoming call */ 145 bool send_pages; /* T if data from mapping should be sent */ 146 bool need_attention; /* T if RxRPC poked us */ 147 bool async; /* T if asynchronous */ 148 bool ret_reply0; /* T if should return reply[0] on success */ 149 bool upgrade; /* T to request service upgrade */ 150 bool want_reply_time; /* T if want reply_time */ 151 u16 service_id; /* Actual service ID (after upgrade) */ 152 unsigned int debug_id; /* Trace ID */ 153 u32 operation_ID; /* operation ID for an incoming call */ 154 u32 count; /* count for use in unmarshalling */ 155 union { /* place to extract temporary data */ 156 struct { 157 __be32 tmp_u; 158 __be32 tmp; 159 } __attribute__((packed)); 160 __be64 tmp64; 161 }; 162 afs_dataversion_t expected_version; /* Updated version expected from store */ 163 afs_dataversion_t expected_version_2; /* 2nd updated version expected from store */ 164 ktime_t reply_time; /* Time of first reply packet */ 165 }; 166 167 struct afs_call_type { 168 const char *name; 169 unsigned int op; /* Really enum afs_fs_operation */ 170 171 /* deliver request or reply data to an call 172 * - returning an error will cause the call to be aborted 173 */ 174 int (*deliver)(struct afs_call *call); 175 176 /* clean up a call */ 177 void (*destructor)(struct afs_call *call); 178 179 /* Work function */ 180 void (*work)(struct work_struct *work); 181 182 /* Call done function (gets called immediately on success or failure) */ 183 void (*done)(struct afs_call *call); 184 }; 185 186 /* 187 * Key available for writeback on a file. 188 */ 189 struct afs_wb_key { 190 refcount_t usage; 191 struct key *key; 192 struct list_head vnode_link; /* Link in vnode->wb_keys */ 193 }; 194 195 /* 196 * AFS open file information record. Pointed to by file->private_data. 197 */ 198 struct afs_file { 199 struct key *key; /* The key this file was opened with */ 200 struct afs_wb_key *wb; /* Writeback key record for this file */ 201 }; 202 203 static inline struct key *afs_file_key(struct file *file) 204 { 205 struct afs_file *af = file->private_data; 206 207 return af->key; 208 } 209 210 /* 211 * Record of an outstanding read operation on a vnode. 212 */ 213 struct afs_read { 214 loff_t pos; /* Where to start reading */ 215 loff_t len; /* How much we're asking for */ 216 loff_t actual_len; /* How much we're actually getting */ 217 loff_t remain; /* Amount remaining */ 218 loff_t file_size; /* File size returned by server */ 219 afs_dataversion_t data_version; /* Version number returned by server */ 220 refcount_t usage; 221 unsigned int index; /* Which page we're reading into */ 222 unsigned int nr_pages; 223 unsigned int offset; /* offset into current page */ 224 void (*page_done)(struct afs_call *, struct afs_read *); 225 struct page **pages; 226 struct page *array[]; 227 }; 228 229 /* 230 * AFS superblock private data 231 * - there's one superblock per volume 232 */ 233 struct afs_super_info { 234 struct net *net_ns; /* Network namespace */ 235 struct afs_cell *cell; /* The cell in which the volume resides */ 236 struct afs_volume *volume; /* volume record */ 237 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 238 bool dyn_root; /* True if dynamic root */ 239 }; 240 241 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 242 { 243 return sb->s_fs_info; 244 } 245 246 extern struct file_system_type afs_fs_type; 247 248 /* 249 * Set of substitutes for @sys. 250 */ 251 struct afs_sysnames { 252 #define AFS_NR_SYSNAME 16 253 char *subs[AFS_NR_SYSNAME]; 254 refcount_t usage; 255 unsigned short nr; 256 char blank[1]; 257 }; 258 259 /* 260 * AFS network namespace record. 261 */ 262 struct afs_net { 263 struct net *net; /* Backpointer to the owning net namespace */ 264 struct afs_uuid uuid; 265 bool live; /* F if this namespace is being removed */ 266 267 /* AF_RXRPC I/O stuff */ 268 struct socket *socket; 269 struct afs_call *spare_incoming_call; 270 struct work_struct charge_preallocation_work; 271 struct mutex socket_mutex; 272 atomic_t nr_outstanding_calls; 273 atomic_t nr_superblocks; 274 275 /* Cell database */ 276 struct rb_root cells; 277 struct afs_cell __rcu *ws_cell; 278 struct work_struct cells_manager; 279 struct timer_list cells_timer; 280 atomic_t cells_outstanding; 281 seqlock_t cells_lock; 282 283 struct mutex proc_cells_lock; 284 struct hlist_head proc_cells; 285 286 /* Known servers. Theoretically each fileserver can only be in one 287 * cell, but in practice, people create aliases and subsets and there's 288 * no easy way to distinguish them. 289 */ 290 seqlock_t fs_lock; /* For fs_servers */ 291 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 292 struct list_head fs_updates; /* afs_server (by update_at) */ 293 struct hlist_head fs_proc; /* procfs servers list */ 294 295 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 296 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 297 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 298 299 struct work_struct fs_manager; 300 struct timer_list fs_timer; 301 atomic_t servers_outstanding; 302 303 /* File locking renewal management */ 304 struct mutex lock_manager_mutex; 305 306 /* Misc */ 307 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 308 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 309 struct afs_sysnames *sysnames; 310 rwlock_t sysnames_lock; 311 312 /* Statistics counters */ 313 atomic_t n_lookup; /* Number of lookups done */ 314 atomic_t n_reval; /* Number of dentries needing revalidation */ 315 atomic_t n_inval; /* Number of invalidations by the server */ 316 atomic_t n_relpg; /* Number of invalidations by releasepage */ 317 atomic_t n_read_dir; /* Number of directory pages read */ 318 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 319 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 320 atomic_t n_stores; /* Number of store ops */ 321 atomic_long_t n_store_bytes; /* Number of bytes stored */ 322 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 323 atomic_t n_fetches; /* Number of data fetch ops */ 324 }; 325 326 extern const char afs_init_sysname[]; 327 328 enum afs_cell_state { 329 AFS_CELL_UNSET, 330 AFS_CELL_ACTIVATING, 331 AFS_CELL_ACTIVE, 332 AFS_CELL_DEACTIVATING, 333 AFS_CELL_INACTIVE, 334 AFS_CELL_FAILED, 335 }; 336 337 /* 338 * AFS cell record. 339 * 340 * This is a tricky concept to get right as it is possible to create aliases 341 * simply by pointing AFSDB/SRV records for two names at the same set of VL 342 * servers; it is also possible to do things like setting up two sets of VL 343 * servers, one of which provides a superset of the volumes provided by the 344 * other (for internal/external division, for example). 345 * 346 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 347 * servers and (b) a cell's name is used by the client to select the key to use 348 * for authentication and encryption. The cell name is not typically used in 349 * the protocol. 350 * 351 * There is no easy way to determine if two cells are aliases or one is a 352 * subset of another. 353 */ 354 struct afs_cell { 355 union { 356 struct rcu_head rcu; 357 struct rb_node net_node; /* Node in net->cells */ 358 }; 359 struct afs_net *net; 360 struct key *anonymous_key; /* anonymous user key for this cell */ 361 struct work_struct manager; /* Manager for init/deinit/dns */ 362 struct hlist_node proc_link; /* /proc cell list link */ 363 #ifdef CONFIG_AFS_FSCACHE 364 struct fscache_cookie *cache; /* caching cookie */ 365 #endif 366 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 367 time64_t last_inactive; /* Time of last drop of usage count */ 368 atomic_t usage; 369 unsigned long flags; 370 #define AFS_CELL_FL_NOT_READY 0 /* The cell record is not ready for use */ 371 #define AFS_CELL_FL_NO_GC 1 /* The cell was added manually, don't auto-gc */ 372 #define AFS_CELL_FL_NOT_FOUND 2 /* Permanent DNS error */ 373 #define AFS_CELL_FL_DNS_FAIL 3 /* Failed to access DNS */ 374 #define AFS_CELL_FL_NO_LOOKUP_YET 4 /* Not completed first DNS lookup yet */ 375 enum afs_cell_state state; 376 short error; 377 378 /* Active fileserver interaction state. */ 379 struct list_head proc_volumes; /* procfs volume list */ 380 rwlock_t proc_lock; 381 382 /* VL server list. */ 383 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 384 struct afs_vlserver_list __rcu *vl_servers; 385 386 u8 name_len; /* Length of name */ 387 char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */ 388 }; 389 390 /* 391 * Volume Location server record. 392 */ 393 struct afs_vlserver { 394 struct rcu_head rcu; 395 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 396 unsigned long flags; 397 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 398 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 399 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 400 rwlock_t lock; /* Lock on addresses */ 401 atomic_t usage; 402 403 /* Probe state */ 404 wait_queue_head_t probe_wq; 405 atomic_t probe_outstanding; 406 spinlock_t probe_lock; 407 struct { 408 unsigned int rtt; /* RTT as ktime/64 */ 409 u32 abort_code; 410 short error; 411 bool have_result; 412 bool responded:1; 413 bool is_yfs:1; 414 bool not_yfs:1; 415 bool local_failure:1; 416 } probe; 417 418 u16 port; 419 u16 name_len; /* Length of name */ 420 char name[]; /* Server name, case-flattened */ 421 }; 422 423 /* 424 * Weighted list of Volume Location servers. 425 */ 426 struct afs_vlserver_entry { 427 u16 priority; /* Preference (as SRV) */ 428 u16 weight; /* Weight (as SRV) */ 429 enum dns_record_source source:8; 430 enum dns_lookup_status status:8; 431 struct afs_vlserver *server; 432 }; 433 434 struct afs_vlserver_list { 435 struct rcu_head rcu; 436 atomic_t usage; 437 u8 nr_servers; 438 u8 index; /* Server currently in use */ 439 u8 preferred; /* Preferred server */ 440 enum dns_record_source source:8; 441 enum dns_lookup_status status:8; 442 rwlock_t lock; 443 struct afs_vlserver_entry servers[]; 444 }; 445 446 /* 447 * Cached VLDB entry. 448 * 449 * This is pointed to by cell->vldb_entries, indexed by name. 450 */ 451 struct afs_vldb_entry { 452 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 453 454 unsigned long flags; 455 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 456 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 457 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 458 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 459 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 460 461 uuid_t fs_server[AFS_NMAXNSERVERS]; 462 u8 fs_mask[AFS_NMAXNSERVERS]; 463 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 464 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 465 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 466 short error; 467 u8 nr_servers; /* Number of server records */ 468 u8 name_len; 469 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 470 }; 471 472 /* 473 * Record of fileserver with which we're actively communicating. 474 */ 475 struct afs_server { 476 struct rcu_head rcu; 477 union { 478 uuid_t uuid; /* Server ID */ 479 struct afs_uuid _uuid; 480 }; 481 482 struct afs_addr_list __rcu *addresses; 483 struct rb_node uuid_rb; /* Link in net->servers */ 484 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 485 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 486 struct hlist_node proc_link; /* Link in net->fs_proc */ 487 struct afs_server *gc_next; /* Next server in manager's list */ 488 time64_t put_time; /* Time at which last put */ 489 time64_t update_at; /* Time at which to next update the record */ 490 unsigned long flags; 491 #define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */ 492 #define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */ 493 #define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */ 494 #define AFS_SERVER_FL_UPDATING 4 495 #define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */ 496 #define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */ 497 #define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */ 498 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 499 #define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */ 500 #define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */ 501 #define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */ 502 atomic_t usage; 503 u32 addr_version; /* Address list version */ 504 u32 cm_epoch; /* Server RxRPC epoch */ 505 506 /* file service access */ 507 rwlock_t fs_lock; /* access lock */ 508 509 /* callback promise management */ 510 struct hlist_head cb_volumes; /* List of volume interests on this server */ 511 unsigned cb_s_break; /* Break-everything counter. */ 512 rwlock_t cb_break_lock; /* Volume finding lock */ 513 514 /* Probe state */ 515 wait_queue_head_t probe_wq; 516 atomic_t probe_outstanding; 517 spinlock_t probe_lock; 518 struct { 519 unsigned int rtt; /* RTT as ktime/64 */ 520 u32 abort_code; 521 u32 cm_epoch; 522 short error; 523 bool have_result; 524 bool responded:1; 525 bool is_yfs:1; 526 bool not_yfs:1; 527 bool local_failure:1; 528 bool no_epoch:1; 529 bool cm_probed:1; 530 bool said_rebooted:1; 531 bool said_inconsistent:1; 532 } probe; 533 }; 534 535 /* 536 * Volume collation in the server's callback interest list. 537 */ 538 struct afs_vol_interest { 539 struct hlist_node srv_link; /* Link in server->cb_volumes */ 540 struct hlist_head cb_interests; /* List of callback interests on the server */ 541 afs_volid_t vid; /* Volume ID to match */ 542 unsigned int usage; 543 }; 544 545 /* 546 * Interest by a superblock on a server. 547 */ 548 struct afs_cb_interest { 549 struct hlist_node cb_vlink; /* Link in vol_interest->cb_interests */ 550 struct afs_vol_interest *vol_interest; 551 struct afs_server *server; /* Server on which this interest resides */ 552 struct super_block *sb; /* Superblock on which inodes reside */ 553 afs_volid_t vid; /* Volume ID to match */ 554 refcount_t usage; 555 }; 556 557 /* 558 * Replaceable server list. 559 */ 560 struct afs_server_entry { 561 struct afs_server *server; 562 struct afs_cb_interest *cb_interest; 563 }; 564 565 struct afs_server_list { 566 refcount_t usage; 567 unsigned char nr_servers; 568 unsigned char preferred; /* Preferred server */ 569 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 570 unsigned int seq; /* Set to ->servers_seq when installed */ 571 rwlock_t lock; 572 struct afs_server_entry servers[]; 573 }; 574 575 /* 576 * Live AFS volume management. 577 */ 578 struct afs_volume { 579 afs_volid_t vid; /* volume ID */ 580 atomic_t usage; 581 time64_t update_at; /* Time at which to next update */ 582 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 583 struct list_head proc_link; /* Link in cell->vl_proc */ 584 unsigned long flags; 585 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 586 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 587 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 588 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 589 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 590 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 591 #ifdef CONFIG_AFS_FSCACHE 592 struct fscache_cookie *cache; /* caching cookie */ 593 #endif 594 struct afs_server_list *servers; /* List of servers on which volume resides */ 595 rwlock_t servers_lock; /* Lock for ->servers */ 596 unsigned int servers_seq; /* Incremented each time ->servers changes */ 597 598 unsigned cb_v_break; /* Break-everything counter. */ 599 rwlock_t cb_break_lock; 600 601 afs_voltype_t type; /* type of volume */ 602 short error; 603 char type_force; /* force volume type (suppress R/O -> R/W) */ 604 u8 name_len; 605 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 606 }; 607 608 enum afs_lock_state { 609 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 610 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 611 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 612 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 613 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 614 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 615 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 616 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 617 }; 618 619 /* 620 * AFS inode private data. 621 * 622 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 623 * leak from one inode to another. 624 */ 625 struct afs_vnode { 626 struct inode vfs_inode; /* the VFS's inode record */ 627 628 struct afs_volume *volume; /* volume on which vnode resides */ 629 struct afs_fid fid; /* the file identifier for this inode */ 630 struct afs_file_status status; /* AFS status info for this file */ 631 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 632 #ifdef CONFIG_AFS_FSCACHE 633 struct fscache_cookie *cache; /* caching cookie */ 634 #endif 635 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 636 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 637 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 638 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 639 struct key *silly_key; /* Silly rename key */ 640 spinlock_t wb_lock; /* lock for wb_keys */ 641 spinlock_t lock; /* waitqueue/flags lock */ 642 unsigned long flags; 643 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 644 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 645 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 646 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 647 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 648 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 649 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 650 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 651 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 652 653 struct list_head wb_keys; /* List of keys available for writeback */ 654 struct list_head pending_locks; /* locks waiting to be granted */ 655 struct list_head granted_locks; /* locks granted on this file */ 656 struct delayed_work lock_work; /* work to be done in locking */ 657 struct key *lock_key; /* Key to be used in lock ops */ 658 ktime_t locked_at; /* Time at which lock obtained */ 659 enum afs_lock_state lock_state : 8; 660 afs_lock_type_t lock_type : 8; 661 662 /* outstanding callback notification on this file */ 663 struct afs_cb_interest *cb_interest; /* Server on which this resides */ 664 unsigned int cb_s_break; /* Mass break counter on ->server */ 665 unsigned int cb_v_break; /* Mass break counter on ->volume */ 666 unsigned int cb_break; /* Break counter on vnode */ 667 seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */ 668 669 time64_t cb_expires_at; /* time at which callback expires */ 670 unsigned cb_version; /* callback version */ 671 afs_callback_type_t cb_type; /* type of callback */ 672 }; 673 674 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 675 { 676 #ifdef CONFIG_AFS_FSCACHE 677 return vnode->cache; 678 #else 679 return NULL; 680 #endif 681 } 682 683 /* 684 * cached security record for one user's attempt to access a vnode 685 */ 686 struct afs_permit { 687 struct key *key; /* RxRPC ticket holding a security context */ 688 afs_access_t access; /* CallerAccess value for this key */ 689 }; 690 691 /* 692 * Immutable cache of CallerAccess records from attempts to access vnodes. 693 * These may be shared between multiple vnodes. 694 */ 695 struct afs_permits { 696 struct rcu_head rcu; 697 struct hlist_node hash_node; /* Link in hash */ 698 unsigned long h; /* Hash value for this permit list */ 699 refcount_t usage; 700 unsigned short nr_permits; /* Number of records */ 701 bool invalidated; /* Invalidated due to key change */ 702 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 703 }; 704 705 /* 706 * record of one of a system's set of network interfaces 707 */ 708 struct afs_interface { 709 struct in_addr address; /* IPv4 address bound to interface */ 710 struct in_addr netmask; /* netmask applied to address */ 711 unsigned mtu; /* MTU of interface */ 712 }; 713 714 /* 715 * Error prioritisation and accumulation. 716 */ 717 struct afs_error { 718 short error; /* Accumulated error */ 719 bool responded; /* T if server responded */ 720 }; 721 722 /* 723 * Cursor for iterating over a server's address list. 724 */ 725 struct afs_addr_cursor { 726 struct afs_addr_list *alist; /* Current address list (pins ref) */ 727 unsigned long tried; /* Tried addresses */ 728 signed char index; /* Current address */ 729 bool responded; /* T if the current address responded */ 730 unsigned short nr_iterations; /* Number of address iterations */ 731 short error; 732 u32 abort_code; 733 }; 734 735 /* 736 * Cursor for iterating over a set of volume location servers. 737 */ 738 struct afs_vl_cursor { 739 struct afs_addr_cursor ac; 740 struct afs_cell *cell; /* The cell we're querying */ 741 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 742 struct afs_vlserver *server; /* Server on which this resides */ 743 struct key *key; /* Key for the server */ 744 unsigned long untried; /* Bitmask of untried servers */ 745 short index; /* Current server */ 746 short error; 747 unsigned short flags; 748 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 749 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 750 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 751 unsigned short nr_iterations; /* Number of server iterations */ 752 }; 753 754 /* 755 * Cursor for iterating over a set of fileservers. 756 */ 757 struct afs_fs_cursor { 758 struct afs_addr_cursor ac; 759 struct afs_vnode *vnode; 760 struct afs_server_list *server_list; /* Current server list (pins ref) */ 761 struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */ 762 struct key *key; /* Key for the server */ 763 unsigned long untried; /* Bitmask of untried servers */ 764 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 765 unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */ 766 short index; /* Current server */ 767 short error; 768 unsigned short flags; 769 #define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */ 770 #define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */ 771 #define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */ 772 #define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */ 773 #define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 774 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 775 unsigned short nr_iterations; /* Number of server iterations */ 776 }; 777 778 /* 779 * Cache auxiliary data. 780 */ 781 struct afs_vnode_cache_aux { 782 u64 data_version; 783 } __packed; 784 785 #include <trace/events/afs.h> 786 787 /*****************************************************************************/ 788 /* 789 * addr_list.c 790 */ 791 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 792 { 793 if (alist) 794 refcount_inc(&alist->usage); 795 return alist; 796 } 797 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 798 unsigned short, 799 unsigned short); 800 extern void afs_put_addrlist(struct afs_addr_list *); 801 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 802 const char *, size_t, char, 803 unsigned short, unsigned short); 804 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 805 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 806 extern int afs_end_cursor(struct afs_addr_cursor *); 807 808 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 809 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 810 811 /* 812 * cache.c 813 */ 814 #ifdef CONFIG_AFS_FSCACHE 815 extern struct fscache_netfs afs_cache_netfs; 816 extern struct fscache_cookie_def afs_cell_cache_index_def; 817 extern struct fscache_cookie_def afs_volume_cache_index_def; 818 extern struct fscache_cookie_def afs_vnode_cache_index_def; 819 #else 820 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 821 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 822 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 823 #endif 824 825 /* 826 * callback.c 827 */ 828 extern void afs_init_callback_state(struct afs_server *); 829 extern void __afs_break_callback(struct afs_vnode *); 830 extern void afs_break_callback(struct afs_vnode *); 831 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*); 832 833 extern int afs_register_server_cb_interest(struct afs_vnode *, 834 struct afs_server_list *, unsigned int); 835 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *); 836 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *); 837 838 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi) 839 { 840 if (cbi) 841 refcount_inc(&cbi->usage); 842 return cbi; 843 } 844 845 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 846 { 847 return vnode->cb_break + vnode->cb_v_break; 848 } 849 850 static inline bool afs_cb_is_broken(unsigned int cb_break, 851 const struct afs_vnode *vnode, 852 const struct afs_cb_interest *cbi) 853 { 854 return !cbi || cb_break != (vnode->cb_break + 855 vnode->volume->cb_v_break); 856 } 857 858 /* 859 * cell.c 860 */ 861 extern int afs_cell_init(struct afs_net *, const char *); 862 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 863 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 864 const char *, bool); 865 extern struct afs_cell *afs_get_cell(struct afs_cell *); 866 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 867 extern void afs_manage_cells(struct work_struct *); 868 extern void afs_cells_timer(struct timer_list *); 869 extern void __net_exit afs_cell_purge(struct afs_net *); 870 871 /* 872 * cmservice.c 873 */ 874 extern bool afs_cm_incoming_call(struct afs_call *); 875 876 /* 877 * dir.c 878 */ 879 extern const struct file_operations afs_dir_file_operations; 880 extern const struct inode_operations afs_dir_inode_operations; 881 extern const struct address_space_operations afs_dir_aops; 882 extern const struct dentry_operations afs_fs_dentry_operations; 883 884 extern void afs_d_release(struct dentry *); 885 extern int afs_dir_remove_link(struct dentry *, struct key *, unsigned long, unsigned long); 886 887 /* 888 * dir_edit.c 889 */ 890 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 891 enum afs_edit_dir_reason); 892 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 893 894 /* 895 * dir_silly.c 896 */ 897 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 898 struct dentry *, struct key *); 899 extern int afs_silly_iput(struct dentry *, struct inode *); 900 901 /* 902 * dynroot.c 903 */ 904 extern const struct file_operations afs_dynroot_file_operations; 905 extern const struct inode_operations afs_dynroot_inode_operations; 906 extern const struct dentry_operations afs_dynroot_dentry_operations; 907 908 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 909 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 910 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 911 extern int afs_dynroot_populate(struct super_block *); 912 extern void afs_dynroot_depopulate(struct super_block *); 913 914 /* 915 * file.c 916 */ 917 extern const struct address_space_operations afs_fs_aops; 918 extern const struct inode_operations afs_file_inode_operations; 919 extern const struct file_operations afs_file_operations; 920 921 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 922 extern void afs_put_wb_key(struct afs_wb_key *); 923 extern int afs_open(struct inode *, struct file *); 924 extern int afs_release(struct inode *, struct file *); 925 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 926 extern int afs_page_filler(void *, struct page *); 927 extern void afs_put_read(struct afs_read *); 928 929 /* 930 * flock.c 931 */ 932 extern struct workqueue_struct *afs_lock_manager; 933 934 extern void afs_lock_op_done(struct afs_call *); 935 extern void afs_lock_work(struct work_struct *); 936 extern void afs_lock_may_be_available(struct afs_vnode *); 937 extern int afs_lock(struct file *, int, struct file_lock *); 938 extern int afs_flock(struct file *, int, struct file_lock *); 939 940 /* 941 * fsclient.c 942 */ 943 #define AFS_VNODE_NOT_YET_SET 0x01 944 #define AFS_VNODE_META_CHANGED 0x02 945 #define AFS_VNODE_DATA_CHANGED 0x04 946 extern void afs_update_inode_from_status(struct afs_vnode *, struct afs_file_status *, 947 const afs_dataversion_t *, u8); 948 949 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool); 950 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *); 951 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *); 952 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t, u64, 953 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 954 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, u64); 955 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 956 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64, 957 struct afs_fid *, struct afs_file_status *); 958 extern int afs_fs_rename(struct afs_fs_cursor *, const char *, 959 struct afs_vnode *, const char *, u64, u64); 960 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 961 pgoff_t, pgoff_t, unsigned, unsigned); 962 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *); 963 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 964 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t); 965 extern int afs_fs_extend_lock(struct afs_fs_cursor *); 966 extern int afs_fs_release_lock(struct afs_fs_cursor *); 967 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 968 struct afs_addr_cursor *, struct key *); 969 extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 970 struct afs_addr_cursor *, struct key *, 971 unsigned int); 972 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 973 struct afs_fid *, struct afs_file_status *, 974 struct afs_callback *, unsigned int, 975 struct afs_volsync *); 976 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 977 struct afs_fid *, struct afs_file_status *, 978 struct afs_callback *, struct afs_volsync *); 979 980 struct afs_acl { 981 u32 size; 982 u8 data[]; 983 }; 984 985 extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *); 986 extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *); 987 988 /* 989 * fs_probe.c 990 */ 991 extern void afs_fileserver_probe_result(struct afs_call *); 992 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *); 993 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 994 995 /* 996 * inode.c 997 */ 998 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool); 999 extern int afs_iget5_test(struct inode *, void *); 1000 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1001 extern struct inode *afs_iget(struct super_block *, struct key *, 1002 struct afs_fid *, struct afs_file_status *, 1003 struct afs_callback *, 1004 struct afs_cb_interest *, 1005 struct afs_vnode *); 1006 extern void afs_zap_data(struct afs_vnode *); 1007 extern int afs_validate(struct afs_vnode *, struct key *); 1008 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1009 extern int afs_setattr(struct dentry *, struct iattr *); 1010 extern void afs_evict_inode(struct inode *); 1011 extern int afs_drop_inode(struct inode *); 1012 1013 /* 1014 * main.c 1015 */ 1016 extern struct workqueue_struct *afs_wq; 1017 extern int afs_net_id; 1018 1019 static inline struct afs_net *afs_net(struct net *net) 1020 { 1021 return net_generic(net, afs_net_id); 1022 } 1023 1024 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1025 { 1026 return afs_net(AFS_FS_S(sb)->net_ns); 1027 } 1028 1029 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1030 { 1031 return afs_sb2net(dentry->d_sb); 1032 } 1033 1034 static inline struct afs_net *afs_i2net(struct inode *inode) 1035 { 1036 return afs_sb2net(inode->i_sb); 1037 } 1038 1039 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1040 { 1041 return afs_i2net(&vnode->vfs_inode); 1042 } 1043 1044 static inline struct afs_net *afs_sock2net(struct sock *sk) 1045 { 1046 return net_generic(sock_net(sk), afs_net_id); 1047 } 1048 1049 static inline void __afs_stat(atomic_t *s) 1050 { 1051 atomic_inc(s); 1052 } 1053 1054 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1055 1056 /* 1057 * misc.c 1058 */ 1059 extern int afs_abort_to_error(u32); 1060 extern void afs_prioritise_error(struct afs_error *, int, u32); 1061 1062 /* 1063 * mntpt.c 1064 */ 1065 extern const struct inode_operations afs_mntpt_inode_operations; 1066 extern const struct inode_operations afs_autocell_inode_operations; 1067 extern const struct file_operations afs_mntpt_file_operations; 1068 1069 extern struct vfsmount *afs_d_automount(struct path *); 1070 extern void afs_mntpt_kill_timer(void); 1071 1072 /* 1073 * netdevices.c 1074 */ 1075 extern int afs_get_ipv4_interfaces(struct afs_net *, struct afs_interface *, 1076 size_t, bool); 1077 1078 /* 1079 * proc.c 1080 */ 1081 #ifdef CONFIG_PROC_FS 1082 extern int __net_init afs_proc_init(struct afs_net *); 1083 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1084 extern int afs_proc_cell_setup(struct afs_cell *); 1085 extern void afs_proc_cell_remove(struct afs_cell *); 1086 extern void afs_put_sysnames(struct afs_sysnames *); 1087 #else 1088 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1089 static inline void afs_proc_cleanup(struct afs_net *net) {} 1090 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1091 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1092 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1093 #endif 1094 1095 /* 1096 * rotate.c 1097 */ 1098 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *, 1099 struct key *); 1100 extern bool afs_select_fileserver(struct afs_fs_cursor *); 1101 extern bool afs_select_current_fileserver(struct afs_fs_cursor *); 1102 extern int afs_end_vnode_operation(struct afs_fs_cursor *); 1103 1104 /* 1105 * rxrpc.c 1106 */ 1107 extern struct workqueue_struct *afs_async_calls; 1108 1109 extern int __net_init afs_open_socket(struct afs_net *); 1110 extern void __net_exit afs_close_socket(struct afs_net *); 1111 extern void afs_charge_preallocation(struct work_struct *); 1112 extern void afs_put_call(struct afs_call *); 1113 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1114 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1115 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1116 const struct afs_call_type *, 1117 size_t, size_t); 1118 extern void afs_flat_call_destructor(struct afs_call *); 1119 extern void afs_send_empty_reply(struct afs_call *); 1120 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1121 extern int afs_extract_data(struct afs_call *, bool); 1122 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause); 1123 1124 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1125 { 1126 call->kvec[0].iov_base = buf; 1127 call->kvec[0].iov_len = size; 1128 iov_iter_kvec(&call->iter, READ, call->kvec, 1, size); 1129 } 1130 1131 static inline void afs_extract_to_tmp(struct afs_call *call) 1132 { 1133 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1134 } 1135 1136 static inline void afs_extract_to_tmp64(struct afs_call *call) 1137 { 1138 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1139 } 1140 1141 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1142 { 1143 iov_iter_discard(&call->iter, READ, size); 1144 } 1145 1146 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1147 { 1148 afs_extract_begin(call, call->buffer, size); 1149 } 1150 1151 static inline int afs_transfer_reply(struct afs_call *call) 1152 { 1153 return afs_extract_data(call, false); 1154 } 1155 1156 static inline bool afs_check_call_state(struct afs_call *call, 1157 enum afs_call_state state) 1158 { 1159 return READ_ONCE(call->state) == state; 1160 } 1161 1162 static inline bool afs_set_call_state(struct afs_call *call, 1163 enum afs_call_state from, 1164 enum afs_call_state to) 1165 { 1166 bool ok = false; 1167 1168 spin_lock_bh(&call->state_lock); 1169 if (call->state == from) { 1170 call->state = to; 1171 trace_afs_call_state(call, from, to, 0, 0); 1172 ok = true; 1173 } 1174 spin_unlock_bh(&call->state_lock); 1175 return ok; 1176 } 1177 1178 static inline void afs_set_call_complete(struct afs_call *call, 1179 int error, u32 remote_abort) 1180 { 1181 enum afs_call_state state; 1182 bool ok = false; 1183 1184 spin_lock_bh(&call->state_lock); 1185 state = call->state; 1186 if (state != AFS_CALL_COMPLETE) { 1187 call->abort_code = remote_abort; 1188 call->error = error; 1189 call->state = AFS_CALL_COMPLETE; 1190 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1191 error, remote_abort); 1192 ok = true; 1193 } 1194 spin_unlock_bh(&call->state_lock); 1195 if (ok) 1196 trace_afs_call_done(call); 1197 } 1198 1199 /* 1200 * security.c 1201 */ 1202 extern void afs_put_permits(struct afs_permits *); 1203 extern void afs_clear_permits(struct afs_vnode *); 1204 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int); 1205 extern void afs_zap_permits(struct rcu_head *); 1206 extern struct key *afs_request_key(struct afs_cell *); 1207 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1208 extern int afs_permission(struct inode *, int); 1209 extern void __exit afs_clean_up_permit_cache(void); 1210 1211 /* 1212 * server.c 1213 */ 1214 extern spinlock_t afs_server_peer_lock; 1215 1216 static inline struct afs_server *afs_get_server(struct afs_server *server) 1217 { 1218 atomic_inc(&server->usage); 1219 return server; 1220 } 1221 1222 extern struct afs_server *afs_find_server(struct afs_net *, 1223 const struct sockaddr_rxrpc *); 1224 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1225 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *); 1226 extern void afs_put_server(struct afs_net *, struct afs_server *); 1227 extern void afs_manage_servers(struct work_struct *); 1228 extern void afs_servers_timer(struct timer_list *); 1229 extern void __net_exit afs_purge_servers(struct afs_net *); 1230 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *); 1231 1232 /* 1233 * server_list.c 1234 */ 1235 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1236 { 1237 refcount_inc(&slist->usage); 1238 return slist; 1239 } 1240 1241 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1242 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1243 struct afs_vldb_entry *, 1244 u8); 1245 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1246 1247 /* 1248 * super.c 1249 */ 1250 extern int __init afs_fs_init(void); 1251 extern void afs_fs_exit(void); 1252 1253 /* 1254 * vlclient.c 1255 */ 1256 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1257 const char *, int); 1258 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1259 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1260 struct key *, struct afs_vlserver *, unsigned int); 1261 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1262 1263 /* 1264 * vl_probe.c 1265 */ 1266 extern void afs_vlserver_probe_result(struct afs_call *); 1267 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1268 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1269 1270 /* 1271 * vl_rotate.c 1272 */ 1273 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1274 struct afs_cell *, struct key *); 1275 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1276 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1277 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1278 1279 /* 1280 * vlserver_list.c 1281 */ 1282 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1283 { 1284 atomic_inc(&vlserver->usage); 1285 return vlserver; 1286 } 1287 1288 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1289 { 1290 if (vllist) 1291 atomic_inc(&vllist->usage); 1292 return vllist; 1293 } 1294 1295 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1296 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1297 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1298 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1299 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1300 const void *, size_t); 1301 1302 /* 1303 * volume.c 1304 */ 1305 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume) 1306 { 1307 if (volume) 1308 atomic_inc(&volume->usage); 1309 return volume; 1310 } 1311 1312 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1313 extern void afs_activate_volume(struct afs_volume *); 1314 extern void afs_deactivate_volume(struct afs_volume *); 1315 extern void afs_put_volume(struct afs_cell *, struct afs_volume *); 1316 extern int afs_check_volume_status(struct afs_volume *, struct key *); 1317 1318 /* 1319 * write.c 1320 */ 1321 extern int afs_set_page_dirty(struct page *); 1322 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1323 loff_t pos, unsigned len, unsigned flags, 1324 struct page **pagep, void **fsdata); 1325 extern int afs_write_end(struct file *file, struct address_space *mapping, 1326 loff_t pos, unsigned len, unsigned copied, 1327 struct page *page, void *fsdata); 1328 extern int afs_writepage(struct page *, struct writeback_control *); 1329 extern int afs_writepages(struct address_space *, struct writeback_control *); 1330 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 1331 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1332 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1333 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1334 extern void afs_prune_wb_keys(struct afs_vnode *); 1335 extern int afs_launder_page(struct page *); 1336 1337 /* 1338 * xattr.c 1339 */ 1340 extern const struct xattr_handler *afs_xattr_handlers[]; 1341 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1342 1343 /* 1344 * yfsclient.c 1345 */ 1346 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool); 1347 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *); 1348 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, u64, 1349 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 1350 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, u64, 1351 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 1352 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 1353 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, u64); 1354 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 1355 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64, 1356 struct afs_fid *, struct afs_file_status *); 1357 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, 1358 struct afs_vnode *, const char *, u64, u64); 1359 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 1360 pgoff_t, pgoff_t, unsigned, unsigned); 1361 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *); 1362 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 1363 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t); 1364 extern int yfs_fs_extend_lock(struct afs_fs_cursor *); 1365 extern int yfs_fs_release_lock(struct afs_fs_cursor *); 1366 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 1367 struct afs_fid *, struct afs_file_status *, 1368 struct afs_callback *, struct afs_volsync *); 1369 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 1370 struct afs_fid *, struct afs_file_status *, 1371 struct afs_callback *, unsigned int, 1372 struct afs_volsync *); 1373 1374 struct yfs_acl { 1375 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1376 struct afs_acl *vol_acl; /* Whole volume ACL */ 1377 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1378 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1379 unsigned int flags; 1380 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1381 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1382 }; 1383 1384 extern void yfs_free_opaque_acl(struct yfs_acl *); 1385 extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, unsigned int); 1386 extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *); 1387 1388 /* 1389 * Miscellaneous inline functions. 1390 */ 1391 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1392 { 1393 return container_of(inode, struct afs_vnode, vfs_inode); 1394 } 1395 1396 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1397 { 1398 return &vnode->vfs_inode; 1399 } 1400 1401 static inline void afs_vnode_commit_status(struct afs_fs_cursor *fc, 1402 struct afs_vnode *vnode, 1403 unsigned int cb_break) 1404 { 1405 if (fc->ac.error == 0) 1406 afs_cache_permit(vnode, fc->key, cb_break); 1407 } 1408 1409 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc, 1410 struct afs_vnode *vnode) 1411 { 1412 if (fc->ac.error == -ENOENT) { 1413 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1414 afs_break_callback(vnode); 1415 } 1416 } 1417 1418 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1419 { 1420 trace_afs_io_error(call->debug_id, -EIO, where); 1421 return -EIO; 1422 } 1423 1424 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1425 { 1426 trace_afs_file_error(vnode, -EIO, where); 1427 return -EIO; 1428 } 1429 1430 /*****************************************************************************/ 1431 /* 1432 * debug tracing 1433 */ 1434 extern unsigned afs_debug; 1435 1436 #define dbgprintk(FMT,...) \ 1437 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1438 1439 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1440 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1441 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1442 1443 1444 #if defined(__KDEBUG) 1445 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1446 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1447 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1448 1449 #elif defined(CONFIG_AFS_DEBUG) 1450 #define AFS_DEBUG_KENTER 0x01 1451 #define AFS_DEBUG_KLEAVE 0x02 1452 #define AFS_DEBUG_KDEBUG 0x04 1453 1454 #define _enter(FMT,...) \ 1455 do { \ 1456 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1457 kenter(FMT,##__VA_ARGS__); \ 1458 } while (0) 1459 1460 #define _leave(FMT,...) \ 1461 do { \ 1462 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1463 kleave(FMT,##__VA_ARGS__); \ 1464 } while (0) 1465 1466 #define _debug(FMT,...) \ 1467 do { \ 1468 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1469 kdebug(FMT,##__VA_ARGS__); \ 1470 } while (0) 1471 1472 #else 1473 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1474 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1475 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1476 #endif 1477 1478 /* 1479 * debug assertion checking 1480 */ 1481 #if 1 // defined(__KDEBUGALL) 1482 1483 #define ASSERT(X) \ 1484 do { \ 1485 if (unlikely(!(X))) { \ 1486 printk(KERN_ERR "\n"); \ 1487 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1488 BUG(); \ 1489 } \ 1490 } while(0) 1491 1492 #define ASSERTCMP(X, OP, Y) \ 1493 do { \ 1494 if (unlikely(!((X) OP (Y)))) { \ 1495 printk(KERN_ERR "\n"); \ 1496 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1497 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1498 (unsigned long)(X), (unsigned long)(Y)); \ 1499 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1500 (unsigned long)(X), (unsigned long)(Y)); \ 1501 BUG(); \ 1502 } \ 1503 } while(0) 1504 1505 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1506 do { \ 1507 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1508 printk(KERN_ERR "\n"); \ 1509 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1510 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1511 (unsigned long)(L), (unsigned long)(N), \ 1512 (unsigned long)(H)); \ 1513 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1514 (unsigned long)(L), (unsigned long)(N), \ 1515 (unsigned long)(H)); \ 1516 BUG(); \ 1517 } \ 1518 } while(0) 1519 1520 #define ASSERTIF(C, X) \ 1521 do { \ 1522 if (unlikely((C) && !(X))) { \ 1523 printk(KERN_ERR "\n"); \ 1524 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1525 BUG(); \ 1526 } \ 1527 } while(0) 1528 1529 #define ASSERTIFCMP(C, X, OP, Y) \ 1530 do { \ 1531 if (unlikely((C) && !((X) OP (Y)))) { \ 1532 printk(KERN_ERR "\n"); \ 1533 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1534 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1535 (unsigned long)(X), (unsigned long)(Y)); \ 1536 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1537 (unsigned long)(X), (unsigned long)(Y)); \ 1538 BUG(); \ 1539 } \ 1540 } while(0) 1541 1542 #else 1543 1544 #define ASSERT(X) \ 1545 do { \ 1546 } while(0) 1547 1548 #define ASSERTCMP(X, OP, Y) \ 1549 do { \ 1550 } while(0) 1551 1552 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1553 do { \ 1554 } while(0) 1555 1556 #define ASSERTIF(C, X) \ 1557 do { \ 1558 } while(0) 1559 1560 #define ASSERTIFCMP(C, X, OP, Y) \ 1561 do { \ 1562 } while(0) 1563 1564 #endif /* __KDEBUGALL */ 1565