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 union { 115 struct afs_server *server; 116 struct afs_vlserver *vlserver; 117 }; 118 struct afs_cb_interest *cbi; /* Callback interest for server used */ 119 struct afs_vnode *dvnode; /* Directory vnode of call */ 120 struct afs_vnode *xvnode; /* Other vnode of call */ 121 void *request; /* request data (first part) */ 122 struct address_space *mapping; /* Pages being written from */ 123 struct iov_iter iter; /* Buffer iterator */ 124 struct iov_iter *_iter; /* Iterator currently in use */ 125 union { /* Convenience for ->iter */ 126 struct kvec kvec[1]; 127 struct bio_vec bvec[1]; 128 }; 129 void *buffer; /* reply receive buffer */ 130 union { 131 long ret0; /* Value to reply with instead of 0 */ 132 struct afs_addr_list *ret_alist; 133 struct afs_vldb_entry *ret_vldb; 134 struct afs_acl *ret_acl; 135 }; 136 struct afs_fid *out_fid; 137 struct afs_file_status *out_vnode_status; 138 struct afs_file_status *out_extra_status; 139 struct afs_callback *out_cb; 140 struct afs_status_cb *out_scb; 141 struct yfs_acl *out_yacl; 142 struct afs_volsync *out_volsync; 143 struct afs_volume_status *out_volstatus; 144 struct afs_read *read_request; 145 unsigned int server_index; 146 pgoff_t first; /* first page in mapping to deal with */ 147 pgoff_t last; /* last page in mapping to deal with */ 148 atomic_t usage; 149 enum afs_call_state state; 150 spinlock_t state_lock; 151 int error; /* error code */ 152 u32 abort_code; /* Remote abort ID or 0 */ 153 u32 epoch; 154 unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */ 155 unsigned request_size; /* size of request data */ 156 unsigned reply_max; /* maximum size of reply */ 157 unsigned first_offset; /* offset into mapping[first] */ 158 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 159 union { 160 unsigned last_to; /* amount of mapping[last] */ 161 unsigned count2; /* count used in unmarshalling */ 162 }; 163 unsigned char unmarshall; /* unmarshalling phase */ 164 unsigned char addr_ix; /* Address in ->alist */ 165 bool incoming; /* T if incoming call */ 166 bool send_pages; /* T if data from mapping should be sent */ 167 bool need_attention; /* T if RxRPC poked us */ 168 bool async; /* T if asynchronous */ 169 bool upgrade; /* T to request service upgrade */ 170 bool want_reply_time; /* T if want reply_time */ 171 bool intr; /* T if interruptible */ 172 u16 service_id; /* Actual service ID (after upgrade) */ 173 unsigned int debug_id; /* Trace ID */ 174 u32 operation_ID; /* operation ID for an incoming call */ 175 u32 count; /* count for use in unmarshalling */ 176 union { /* place to extract temporary data */ 177 struct { 178 __be32 tmp_u; 179 __be32 tmp; 180 } __attribute__((packed)); 181 __be64 tmp64; 182 }; 183 afs_dataversion_t expected_version; /* Updated version expected from store */ 184 afs_dataversion_t expected_version_2; /* 2nd updated version expected from store */ 185 ktime_t reply_time; /* Time of first reply packet */ 186 }; 187 188 struct afs_call_type { 189 const char *name; 190 unsigned int op; /* Really enum afs_fs_operation */ 191 192 /* deliver request or reply data to an call 193 * - returning an error will cause the call to be aborted 194 */ 195 int (*deliver)(struct afs_call *call); 196 197 /* clean up a call */ 198 void (*destructor)(struct afs_call *call); 199 200 /* Work function */ 201 void (*work)(struct work_struct *work); 202 203 /* Call done function (gets called immediately on success or failure) */ 204 void (*done)(struct afs_call *call); 205 }; 206 207 /* 208 * Key available for writeback on a file. 209 */ 210 struct afs_wb_key { 211 refcount_t usage; 212 struct key *key; 213 struct list_head vnode_link; /* Link in vnode->wb_keys */ 214 }; 215 216 /* 217 * AFS open file information record. Pointed to by file->private_data. 218 */ 219 struct afs_file { 220 struct key *key; /* The key this file was opened with */ 221 struct afs_wb_key *wb; /* Writeback key record for this file */ 222 }; 223 224 static inline struct key *afs_file_key(struct file *file) 225 { 226 struct afs_file *af = file->private_data; 227 228 return af->key; 229 } 230 231 /* 232 * Record of an outstanding read operation on a vnode. 233 */ 234 struct afs_read { 235 loff_t pos; /* Where to start reading */ 236 loff_t len; /* How much we're asking for */ 237 loff_t actual_len; /* How much we're actually getting */ 238 loff_t remain; /* Amount remaining */ 239 loff_t file_size; /* File size returned by server */ 240 afs_dataversion_t data_version; /* Version number returned by server */ 241 refcount_t usage; 242 unsigned int index; /* Which page we're reading into */ 243 unsigned int nr_pages; 244 unsigned int offset; /* offset into current page */ 245 void (*page_done)(struct afs_call *, struct afs_read *); 246 struct page **pages; 247 struct page *array[]; 248 }; 249 250 /* 251 * AFS superblock private data 252 * - there's one superblock per volume 253 */ 254 struct afs_super_info { 255 struct net *net_ns; /* Network namespace */ 256 struct afs_cell *cell; /* The cell in which the volume resides */ 257 struct afs_volume *volume; /* volume record */ 258 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 259 bool dyn_root; /* True if dynamic root */ 260 }; 261 262 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 263 { 264 return sb->s_fs_info; 265 } 266 267 extern struct file_system_type afs_fs_type; 268 269 /* 270 * Set of substitutes for @sys. 271 */ 272 struct afs_sysnames { 273 #define AFS_NR_SYSNAME 16 274 char *subs[AFS_NR_SYSNAME]; 275 refcount_t usage; 276 unsigned short nr; 277 char blank[1]; 278 }; 279 280 /* 281 * AFS network namespace record. 282 */ 283 struct afs_net { 284 struct net *net; /* Backpointer to the owning net namespace */ 285 struct afs_uuid uuid; 286 bool live; /* F if this namespace is being removed */ 287 288 /* AF_RXRPC I/O stuff */ 289 struct socket *socket; 290 struct afs_call *spare_incoming_call; 291 struct work_struct charge_preallocation_work; 292 struct mutex socket_mutex; 293 atomic_t nr_outstanding_calls; 294 atomic_t nr_superblocks; 295 296 /* Cell database */ 297 struct rb_root cells; 298 struct afs_cell __rcu *ws_cell; 299 struct work_struct cells_manager; 300 struct timer_list cells_timer; 301 atomic_t cells_outstanding; 302 seqlock_t cells_lock; 303 304 struct mutex proc_cells_lock; 305 struct hlist_head proc_cells; 306 307 /* Known servers. Theoretically each fileserver can only be in one 308 * cell, but in practice, people create aliases and subsets and there's 309 * no easy way to distinguish them. 310 */ 311 seqlock_t fs_lock; /* For fs_servers */ 312 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 313 struct list_head fs_updates; /* afs_server (by update_at) */ 314 struct hlist_head fs_proc; /* procfs servers list */ 315 316 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 317 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 318 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 319 320 struct work_struct fs_manager; 321 struct timer_list fs_timer; 322 atomic_t servers_outstanding; 323 324 /* File locking renewal management */ 325 struct mutex lock_manager_mutex; 326 327 /* Misc */ 328 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 329 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 330 struct afs_sysnames *sysnames; 331 rwlock_t sysnames_lock; 332 333 /* Statistics counters */ 334 atomic_t n_lookup; /* Number of lookups done */ 335 atomic_t n_reval; /* Number of dentries needing revalidation */ 336 atomic_t n_inval; /* Number of invalidations by the server */ 337 atomic_t n_relpg; /* Number of invalidations by releasepage */ 338 atomic_t n_read_dir; /* Number of directory pages read */ 339 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 340 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 341 atomic_t n_stores; /* Number of store ops */ 342 atomic_long_t n_store_bytes; /* Number of bytes stored */ 343 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 344 atomic_t n_fetches; /* Number of data fetch ops */ 345 }; 346 347 extern const char afs_init_sysname[]; 348 349 enum afs_cell_state { 350 AFS_CELL_UNSET, 351 AFS_CELL_ACTIVATING, 352 AFS_CELL_ACTIVE, 353 AFS_CELL_DEACTIVATING, 354 AFS_CELL_INACTIVE, 355 AFS_CELL_FAILED, 356 }; 357 358 /* 359 * AFS cell record. 360 * 361 * This is a tricky concept to get right as it is possible to create aliases 362 * simply by pointing AFSDB/SRV records for two names at the same set of VL 363 * servers; it is also possible to do things like setting up two sets of VL 364 * servers, one of which provides a superset of the volumes provided by the 365 * other (for internal/external division, for example). 366 * 367 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 368 * servers and (b) a cell's name is used by the client to select the key to use 369 * for authentication and encryption. The cell name is not typically used in 370 * the protocol. 371 * 372 * There is no easy way to determine if two cells are aliases or one is a 373 * subset of another. 374 */ 375 struct afs_cell { 376 union { 377 struct rcu_head rcu; 378 struct rb_node net_node; /* Node in net->cells */ 379 }; 380 struct afs_net *net; 381 struct key *anonymous_key; /* anonymous user key for this cell */ 382 struct work_struct manager; /* Manager for init/deinit/dns */ 383 struct hlist_node proc_link; /* /proc cell list link */ 384 #ifdef CONFIG_AFS_FSCACHE 385 struct fscache_cookie *cache; /* caching cookie */ 386 #endif 387 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 388 time64_t last_inactive; /* Time of last drop of usage count */ 389 atomic_t usage; 390 unsigned long flags; 391 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 392 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 393 enum afs_cell_state state; 394 short error; 395 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 396 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 397 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 398 399 /* Active fileserver interaction state. */ 400 struct list_head proc_volumes; /* procfs volume list */ 401 rwlock_t proc_lock; 402 403 /* VL server list. */ 404 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 405 struct afs_vlserver_list __rcu *vl_servers; 406 407 u8 name_len; /* Length of name */ 408 char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */ 409 }; 410 411 /* 412 * Volume Location server record. 413 */ 414 struct afs_vlserver { 415 struct rcu_head rcu; 416 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 417 unsigned long flags; 418 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 419 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 420 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 421 rwlock_t lock; /* Lock on addresses */ 422 atomic_t usage; 423 424 /* Probe state */ 425 wait_queue_head_t probe_wq; 426 atomic_t probe_outstanding; 427 spinlock_t probe_lock; 428 struct { 429 unsigned int rtt; /* RTT as ktime/64 */ 430 u32 abort_code; 431 short error; 432 bool have_result; 433 bool responded:1; 434 bool is_yfs:1; 435 bool not_yfs:1; 436 bool local_failure:1; 437 } probe; 438 439 u16 port; 440 u16 name_len; /* Length of name */ 441 char name[]; /* Server name, case-flattened */ 442 }; 443 444 /* 445 * Weighted list of Volume Location servers. 446 */ 447 struct afs_vlserver_entry { 448 u16 priority; /* Preference (as SRV) */ 449 u16 weight; /* Weight (as SRV) */ 450 enum dns_record_source source:8; 451 enum dns_lookup_status status:8; 452 struct afs_vlserver *server; 453 }; 454 455 struct afs_vlserver_list { 456 struct rcu_head rcu; 457 atomic_t usage; 458 u8 nr_servers; 459 u8 index; /* Server currently in use */ 460 u8 preferred; /* Preferred server */ 461 enum dns_record_source source:8; 462 enum dns_lookup_status status:8; 463 rwlock_t lock; 464 struct afs_vlserver_entry servers[]; 465 }; 466 467 /* 468 * Cached VLDB entry. 469 * 470 * This is pointed to by cell->vldb_entries, indexed by name. 471 */ 472 struct afs_vldb_entry { 473 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 474 475 unsigned long flags; 476 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 477 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 478 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 479 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 480 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 481 482 uuid_t fs_server[AFS_NMAXNSERVERS]; 483 u8 fs_mask[AFS_NMAXNSERVERS]; 484 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 485 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 486 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 487 short error; 488 u8 nr_servers; /* Number of server records */ 489 u8 name_len; 490 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 491 }; 492 493 /* 494 * Record of fileserver with which we're actively communicating. 495 */ 496 struct afs_server { 497 struct rcu_head rcu; 498 union { 499 uuid_t uuid; /* Server ID */ 500 struct afs_uuid _uuid; 501 }; 502 503 struct afs_addr_list __rcu *addresses; 504 struct rb_node uuid_rb; /* Link in net->servers */ 505 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 506 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 507 struct hlist_node proc_link; /* Link in net->fs_proc */ 508 struct afs_server *gc_next; /* Next server in manager's list */ 509 time64_t put_time; /* Time at which last put */ 510 time64_t update_at; /* Time at which to next update the record */ 511 unsigned long flags; 512 #define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */ 513 #define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */ 514 #define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */ 515 #define AFS_SERVER_FL_UPDATING 4 516 #define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */ 517 #define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */ 518 #define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */ 519 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 520 #define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */ 521 #define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */ 522 #define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */ 523 atomic_t usage; 524 u32 addr_version; /* Address list version */ 525 u32 cm_epoch; /* Server RxRPC epoch */ 526 527 /* file service access */ 528 rwlock_t fs_lock; /* access lock */ 529 530 /* callback promise management */ 531 struct hlist_head cb_volumes; /* List of volume interests on this server */ 532 unsigned cb_s_break; /* Break-everything counter. */ 533 rwlock_t cb_break_lock; /* Volume finding lock */ 534 535 /* Probe state */ 536 wait_queue_head_t probe_wq; 537 atomic_t probe_outstanding; 538 spinlock_t probe_lock; 539 struct { 540 unsigned int rtt; /* RTT as ktime/64 */ 541 u32 abort_code; 542 u32 cm_epoch; 543 short error; 544 bool have_result; 545 bool responded:1; 546 bool is_yfs:1; 547 bool not_yfs:1; 548 bool local_failure:1; 549 bool no_epoch:1; 550 bool cm_probed:1; 551 bool said_rebooted:1; 552 bool said_inconsistent:1; 553 } probe; 554 }; 555 556 /* 557 * Volume collation in the server's callback interest list. 558 */ 559 struct afs_vol_interest { 560 struct hlist_node srv_link; /* Link in server->cb_volumes */ 561 struct hlist_head cb_interests; /* List of callback interests on the server */ 562 afs_volid_t vid; /* Volume ID to match */ 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 afs_volid_t vid; /* Volume ID to match */ 575 refcount_t usage; 576 }; 577 578 /* 579 * Replaceable server list. 580 */ 581 struct afs_server_entry { 582 struct afs_server *server; 583 struct afs_cb_interest *cb_interest; 584 }; 585 586 struct afs_server_list { 587 refcount_t usage; 588 unsigned char nr_servers; 589 unsigned char preferred; /* Preferred server */ 590 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 591 unsigned int seq; /* Set to ->servers_seq when installed */ 592 rwlock_t lock; 593 struct afs_server_entry servers[]; 594 }; 595 596 /* 597 * Live AFS volume management. 598 */ 599 struct afs_volume { 600 afs_volid_t vid; /* volume ID */ 601 atomic_t usage; 602 time64_t update_at; /* Time at which to next update */ 603 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 604 struct list_head proc_link; /* Link in cell->vl_proc */ 605 unsigned long flags; 606 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 607 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 608 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 609 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 610 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */ 611 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */ 612 #ifdef CONFIG_AFS_FSCACHE 613 struct fscache_cookie *cache; /* caching cookie */ 614 #endif 615 struct afs_server_list *servers; /* List of servers on which volume resides */ 616 rwlock_t servers_lock; /* Lock for ->servers */ 617 unsigned int servers_seq; /* Incremented each time ->servers changes */ 618 619 unsigned cb_v_break; /* Break-everything counter. */ 620 rwlock_t cb_break_lock; 621 622 afs_voltype_t type; /* type of volume */ 623 short error; 624 char type_force; /* force volume type (suppress R/O -> R/W) */ 625 u8 name_len; 626 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 627 }; 628 629 enum afs_lock_state { 630 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 631 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 632 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 633 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 634 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 635 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 636 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 637 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 638 }; 639 640 /* 641 * AFS inode private data. 642 * 643 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 644 * leak from one inode to another. 645 */ 646 struct afs_vnode { 647 struct inode vfs_inode; /* the VFS's inode record */ 648 649 struct afs_volume *volume; /* volume on which vnode resides */ 650 struct afs_fid fid; /* the file identifier for this inode */ 651 struct afs_file_status status; /* AFS status info for this file */ 652 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 653 #ifdef CONFIG_AFS_FSCACHE 654 struct fscache_cookie *cache; /* caching cookie */ 655 #endif 656 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 657 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 658 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 659 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 660 struct key *silly_key; /* Silly rename key */ 661 spinlock_t wb_lock; /* lock for wb_keys */ 662 spinlock_t lock; /* waitqueue/flags lock */ 663 unsigned long flags; 664 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */ 665 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 666 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 667 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 668 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 669 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 670 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 671 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 672 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 673 674 struct list_head wb_keys; /* List of keys available for writeback */ 675 struct list_head pending_locks; /* locks waiting to be granted */ 676 struct list_head granted_locks; /* locks granted on this file */ 677 struct delayed_work lock_work; /* work to be done in locking */ 678 struct key *lock_key; /* Key to be used in lock ops */ 679 ktime_t locked_at; /* Time at which lock obtained */ 680 enum afs_lock_state lock_state : 8; 681 afs_lock_type_t lock_type : 8; 682 683 /* outstanding callback notification on this file */ 684 struct afs_cb_interest *cb_interest; /* Server on which this resides */ 685 unsigned int cb_s_break; /* Mass break counter on ->server */ 686 unsigned int cb_v_break; /* Mass break counter on ->volume */ 687 unsigned int cb_break; /* Break counter on vnode */ 688 seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */ 689 690 time64_t cb_expires_at; /* time at which callback expires */ 691 unsigned cb_version; /* callback version */ 692 afs_callback_type_t cb_type; /* type of callback */ 693 }; 694 695 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 696 { 697 #ifdef CONFIG_AFS_FSCACHE 698 return vnode->cache; 699 #else 700 return NULL; 701 #endif 702 } 703 704 /* 705 * cached security record for one user's attempt to access a vnode 706 */ 707 struct afs_permit { 708 struct key *key; /* RxRPC ticket holding a security context */ 709 afs_access_t access; /* CallerAccess value for this key */ 710 }; 711 712 /* 713 * Immutable cache of CallerAccess records from attempts to access vnodes. 714 * These may be shared between multiple vnodes. 715 */ 716 struct afs_permits { 717 struct rcu_head rcu; 718 struct hlist_node hash_node; /* Link in hash */ 719 unsigned long h; /* Hash value for this permit list */ 720 refcount_t usage; 721 unsigned short nr_permits; /* Number of records */ 722 bool invalidated; /* Invalidated due to key change */ 723 struct afs_permit permits[]; /* List of permits sorted by key pointer */ 724 }; 725 726 /* 727 * record of one of a system's set of network interfaces 728 */ 729 struct afs_interface { 730 struct in_addr address; /* IPv4 address bound to interface */ 731 struct in_addr netmask; /* netmask applied to address */ 732 unsigned mtu; /* MTU of interface */ 733 }; 734 735 /* 736 * Error prioritisation and accumulation. 737 */ 738 struct afs_error { 739 short error; /* Accumulated error */ 740 bool responded; /* T if server responded */ 741 }; 742 743 /* 744 * Cursor for iterating over a server's address list. 745 */ 746 struct afs_addr_cursor { 747 struct afs_addr_list *alist; /* Current address list (pins ref) */ 748 unsigned long tried; /* Tried addresses */ 749 signed char index; /* Current address */ 750 bool responded; /* T if the current address responded */ 751 unsigned short nr_iterations; /* Number of address iterations */ 752 short error; 753 u32 abort_code; 754 }; 755 756 /* 757 * Cursor for iterating over a set of volume location servers. 758 */ 759 struct afs_vl_cursor { 760 struct afs_addr_cursor ac; 761 struct afs_cell *cell; /* The cell we're querying */ 762 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 763 struct afs_vlserver *server; /* Server on which this resides */ 764 struct key *key; /* Key for the server */ 765 unsigned long untried; /* Bitmask of untried servers */ 766 short index; /* Current server */ 767 short error; 768 unsigned short flags; 769 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 770 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 771 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 772 unsigned short nr_iterations; /* Number of server iterations */ 773 }; 774 775 /* 776 * Cursor for iterating over a set of fileservers. 777 */ 778 struct afs_fs_cursor { 779 struct afs_addr_cursor ac; 780 struct afs_vnode *vnode; 781 struct afs_server_list *server_list; /* Current server list (pins ref) */ 782 struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */ 783 struct key *key; /* Key for the server */ 784 unsigned long untried; /* Bitmask of untried servers */ 785 unsigned int cb_break; /* cb_break + cb_s_break before the call */ 786 unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */ 787 short index; /* Current server */ 788 short error; 789 unsigned short flags; 790 #define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */ 791 #define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */ 792 #define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */ 793 #define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */ 794 #define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 795 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 796 #define AFS_FS_CURSOR_INTR 0x0040 /* Set if op is interruptible */ 797 unsigned short nr_iterations; /* Number of server iterations */ 798 }; 799 800 /* 801 * Cache auxiliary data. 802 */ 803 struct afs_vnode_cache_aux { 804 u64 data_version; 805 } __packed; 806 807 #include <trace/events/afs.h> 808 809 /*****************************************************************************/ 810 /* 811 * addr_list.c 812 */ 813 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist) 814 { 815 if (alist) 816 refcount_inc(&alist->usage); 817 return alist; 818 } 819 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int, 820 unsigned short, 821 unsigned short); 822 extern void afs_put_addrlist(struct afs_addr_list *); 823 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 824 const char *, size_t, char, 825 unsigned short, unsigned short); 826 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 827 extern bool afs_iterate_addresses(struct afs_addr_cursor *); 828 extern int afs_end_cursor(struct afs_addr_cursor *); 829 830 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16); 831 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16); 832 833 /* 834 * cache.c 835 */ 836 #ifdef CONFIG_AFS_FSCACHE 837 extern struct fscache_netfs afs_cache_netfs; 838 extern struct fscache_cookie_def afs_cell_cache_index_def; 839 extern struct fscache_cookie_def afs_volume_cache_index_def; 840 extern struct fscache_cookie_def afs_vnode_cache_index_def; 841 #else 842 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 843 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 844 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 845 #endif 846 847 /* 848 * callback.c 849 */ 850 extern void afs_init_callback_state(struct afs_server *); 851 extern void __afs_break_callback(struct afs_vnode *); 852 extern void afs_break_callback(struct afs_vnode *); 853 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*); 854 855 extern int afs_register_server_cb_interest(struct afs_vnode *, 856 struct afs_server_list *, unsigned int); 857 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *); 858 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *); 859 860 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi) 861 { 862 if (cbi) 863 refcount_inc(&cbi->usage); 864 return cbi; 865 } 866 867 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 868 { 869 return vnode->cb_break + vnode->cb_v_break; 870 } 871 872 static inline bool afs_cb_is_broken(unsigned int cb_break, 873 const struct afs_vnode *vnode, 874 const struct afs_cb_interest *cbi) 875 { 876 return !cbi || cb_break != (vnode->cb_break + 877 vnode->volume->cb_v_break); 878 } 879 880 /* 881 * cell.c 882 */ 883 extern int afs_cell_init(struct afs_net *, const char *); 884 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned); 885 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 886 const char *, bool); 887 extern struct afs_cell *afs_get_cell(struct afs_cell *); 888 extern void afs_put_cell(struct afs_net *, struct afs_cell *); 889 extern void afs_manage_cells(struct work_struct *); 890 extern void afs_cells_timer(struct timer_list *); 891 extern void __net_exit afs_cell_purge(struct afs_net *); 892 893 /* 894 * cmservice.c 895 */ 896 extern bool afs_cm_incoming_call(struct afs_call *); 897 898 /* 899 * dir.c 900 */ 901 extern const struct file_operations afs_dir_file_operations; 902 extern const struct inode_operations afs_dir_inode_operations; 903 extern const struct address_space_operations afs_dir_aops; 904 extern const struct dentry_operations afs_fs_dentry_operations; 905 906 extern void afs_d_release(struct dentry *); 907 extern int afs_dir_remove_link(struct dentry *, struct key *, unsigned long, unsigned long); 908 909 /* 910 * dir_edit.c 911 */ 912 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 913 enum afs_edit_dir_reason); 914 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 915 916 /* 917 * dir_silly.c 918 */ 919 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 920 struct dentry *, struct key *); 921 extern int afs_silly_iput(struct dentry *, struct inode *); 922 923 /* 924 * dynroot.c 925 */ 926 extern const struct file_operations afs_dynroot_file_operations; 927 extern const struct inode_operations afs_dynroot_inode_operations; 928 extern const struct dentry_operations afs_dynroot_dentry_operations; 929 930 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 931 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 932 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 933 extern int afs_dynroot_populate(struct super_block *); 934 extern void afs_dynroot_depopulate(struct super_block *); 935 936 /* 937 * file.c 938 */ 939 extern const struct address_space_operations afs_fs_aops; 940 extern const struct inode_operations afs_file_inode_operations; 941 extern const struct file_operations afs_file_operations; 942 943 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 944 extern void afs_put_wb_key(struct afs_wb_key *); 945 extern int afs_open(struct inode *, struct file *); 946 extern int afs_release(struct inode *, struct file *); 947 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *); 948 extern int afs_page_filler(void *, struct page *); 949 extern void afs_put_read(struct afs_read *); 950 951 /* 952 * flock.c 953 */ 954 extern struct workqueue_struct *afs_lock_manager; 955 956 extern void afs_lock_op_done(struct afs_call *); 957 extern void afs_lock_work(struct work_struct *); 958 extern void afs_lock_may_be_available(struct afs_vnode *); 959 extern int afs_lock(struct file *, int, struct file_lock *); 960 extern int afs_flock(struct file *, int, struct file_lock *); 961 962 /* 963 * fsclient.c 964 */ 965 #define AFS_VNODE_NOT_YET_SET 0x01 966 #define AFS_VNODE_META_CHANGED 0x02 967 #define AFS_VNODE_DATA_CHANGED 0x04 968 extern void afs_update_inode_from_status(struct afs_vnode *, struct afs_file_status *, 969 const afs_dataversion_t *, u8); 970 971 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool); 972 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *); 973 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *); 974 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t, u64, 975 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 976 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, u64); 977 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 978 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64, 979 struct afs_fid *, struct afs_file_status *); 980 extern int afs_fs_rename(struct afs_fs_cursor *, const char *, 981 struct afs_vnode *, const char *, u64, u64); 982 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 983 pgoff_t, pgoff_t, unsigned, unsigned); 984 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *); 985 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 986 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t); 987 extern int afs_fs_extend_lock(struct afs_fs_cursor *); 988 extern int afs_fs_release_lock(struct afs_fs_cursor *); 989 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *, 990 struct afs_addr_cursor *, struct key *); 991 extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *, 992 struct afs_addr_cursor *, struct key *, 993 unsigned int); 994 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 995 struct afs_fid *, struct afs_status_cb *, 996 unsigned int, struct afs_volsync *); 997 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 998 struct afs_fid *, struct afs_file_status *, 999 struct afs_callback *, struct afs_volsync *); 1000 1001 struct afs_acl { 1002 u32 size; 1003 u8 data[]; 1004 }; 1005 1006 extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *); 1007 extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *); 1008 1009 /* 1010 * fs_probe.c 1011 */ 1012 extern void afs_fileserver_probe_result(struct afs_call *); 1013 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *); 1014 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long); 1015 1016 /* 1017 * inode.c 1018 */ 1019 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool); 1020 extern int afs_iget5_test(struct inode *, void *); 1021 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1022 extern struct inode *afs_iget(struct super_block *, struct key *, 1023 struct afs_fid *, struct afs_file_status *, 1024 struct afs_callback *, 1025 struct afs_cb_interest *, 1026 struct afs_vnode *); 1027 extern void afs_zap_data(struct afs_vnode *); 1028 extern int afs_validate(struct afs_vnode *, struct key *); 1029 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 1030 extern int afs_setattr(struct dentry *, struct iattr *); 1031 extern void afs_evict_inode(struct inode *); 1032 extern int afs_drop_inode(struct inode *); 1033 1034 /* 1035 * main.c 1036 */ 1037 extern struct workqueue_struct *afs_wq; 1038 extern int afs_net_id; 1039 1040 static inline struct afs_net *afs_net(struct net *net) 1041 { 1042 return net_generic(net, afs_net_id); 1043 } 1044 1045 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1046 { 1047 return afs_net(AFS_FS_S(sb)->net_ns); 1048 } 1049 1050 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1051 { 1052 return afs_sb2net(dentry->d_sb); 1053 } 1054 1055 static inline struct afs_net *afs_i2net(struct inode *inode) 1056 { 1057 return afs_sb2net(inode->i_sb); 1058 } 1059 1060 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1061 { 1062 return afs_i2net(&vnode->vfs_inode); 1063 } 1064 1065 static inline struct afs_net *afs_sock2net(struct sock *sk) 1066 { 1067 return net_generic(sock_net(sk), afs_net_id); 1068 } 1069 1070 static inline void __afs_stat(atomic_t *s) 1071 { 1072 atomic_inc(s); 1073 } 1074 1075 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1076 1077 /* 1078 * misc.c 1079 */ 1080 extern int afs_abort_to_error(u32); 1081 extern void afs_prioritise_error(struct afs_error *, int, u32); 1082 1083 /* 1084 * mntpt.c 1085 */ 1086 extern const struct inode_operations afs_mntpt_inode_operations; 1087 extern const struct inode_operations afs_autocell_inode_operations; 1088 extern const struct file_operations afs_mntpt_file_operations; 1089 1090 extern struct vfsmount *afs_d_automount(struct path *); 1091 extern void afs_mntpt_kill_timer(void); 1092 1093 /* 1094 * netdevices.c 1095 */ 1096 extern int afs_get_ipv4_interfaces(struct afs_net *, struct afs_interface *, 1097 size_t, bool); 1098 1099 /* 1100 * proc.c 1101 */ 1102 #ifdef CONFIG_PROC_FS 1103 extern int __net_init afs_proc_init(struct afs_net *); 1104 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1105 extern int afs_proc_cell_setup(struct afs_cell *); 1106 extern void afs_proc_cell_remove(struct afs_cell *); 1107 extern void afs_put_sysnames(struct afs_sysnames *); 1108 #else 1109 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1110 static inline void afs_proc_cleanup(struct afs_net *net) {} 1111 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1112 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1113 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1114 #endif 1115 1116 /* 1117 * rotate.c 1118 */ 1119 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *, 1120 struct key *, bool); 1121 extern bool afs_select_fileserver(struct afs_fs_cursor *); 1122 extern bool afs_select_current_fileserver(struct afs_fs_cursor *); 1123 extern int afs_end_vnode_operation(struct afs_fs_cursor *); 1124 1125 /* 1126 * rxrpc.c 1127 */ 1128 extern struct workqueue_struct *afs_async_calls; 1129 1130 extern int __net_init afs_open_socket(struct afs_net *); 1131 extern void __net_exit afs_close_socket(struct afs_net *); 1132 extern void afs_charge_preallocation(struct work_struct *); 1133 extern void afs_put_call(struct afs_call *); 1134 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t); 1135 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); 1136 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1137 const struct afs_call_type *, 1138 size_t, size_t); 1139 extern void afs_flat_call_destructor(struct afs_call *); 1140 extern void afs_send_empty_reply(struct afs_call *); 1141 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1142 extern int afs_extract_data(struct afs_call *, bool); 1143 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause); 1144 1145 static inline void afs_set_fc_call(struct afs_call *call, struct afs_fs_cursor *fc) 1146 { 1147 call->intr = fc->flags & AFS_FS_CURSOR_INTR; 1148 } 1149 1150 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1151 { 1152 call->kvec[0].iov_base = buf; 1153 call->kvec[0].iov_len = size; 1154 iov_iter_kvec(&call->iter, READ, call->kvec, 1, size); 1155 } 1156 1157 static inline void afs_extract_to_tmp(struct afs_call *call) 1158 { 1159 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1160 } 1161 1162 static inline void afs_extract_to_tmp64(struct afs_call *call) 1163 { 1164 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1165 } 1166 1167 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1168 { 1169 iov_iter_discard(&call->iter, READ, size); 1170 } 1171 1172 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1173 { 1174 afs_extract_begin(call, call->buffer, size); 1175 } 1176 1177 static inline int afs_transfer_reply(struct afs_call *call) 1178 { 1179 return afs_extract_data(call, false); 1180 } 1181 1182 static inline bool afs_check_call_state(struct afs_call *call, 1183 enum afs_call_state state) 1184 { 1185 return READ_ONCE(call->state) == state; 1186 } 1187 1188 static inline bool afs_set_call_state(struct afs_call *call, 1189 enum afs_call_state from, 1190 enum afs_call_state to) 1191 { 1192 bool ok = false; 1193 1194 spin_lock_bh(&call->state_lock); 1195 if (call->state == from) { 1196 call->state = to; 1197 trace_afs_call_state(call, from, to, 0, 0); 1198 ok = true; 1199 } 1200 spin_unlock_bh(&call->state_lock); 1201 return ok; 1202 } 1203 1204 static inline void afs_set_call_complete(struct afs_call *call, 1205 int error, u32 remote_abort) 1206 { 1207 enum afs_call_state state; 1208 bool ok = false; 1209 1210 spin_lock_bh(&call->state_lock); 1211 state = call->state; 1212 if (state != AFS_CALL_COMPLETE) { 1213 call->abort_code = remote_abort; 1214 call->error = error; 1215 call->state = AFS_CALL_COMPLETE; 1216 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1217 error, remote_abort); 1218 ok = true; 1219 } 1220 spin_unlock_bh(&call->state_lock); 1221 if (ok) 1222 trace_afs_call_done(call); 1223 } 1224 1225 /* 1226 * security.c 1227 */ 1228 extern void afs_put_permits(struct afs_permits *); 1229 extern void afs_clear_permits(struct afs_vnode *); 1230 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int); 1231 extern void afs_zap_permits(struct rcu_head *); 1232 extern struct key *afs_request_key(struct afs_cell *); 1233 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1234 extern int afs_permission(struct inode *, int); 1235 extern void __exit afs_clean_up_permit_cache(void); 1236 1237 /* 1238 * server.c 1239 */ 1240 extern spinlock_t afs_server_peer_lock; 1241 1242 static inline struct afs_server *afs_get_server(struct afs_server *server) 1243 { 1244 atomic_inc(&server->usage); 1245 return server; 1246 } 1247 1248 extern struct afs_server *afs_find_server(struct afs_net *, 1249 const struct sockaddr_rxrpc *); 1250 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1251 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *); 1252 extern void afs_put_server(struct afs_net *, struct afs_server *); 1253 extern void afs_manage_servers(struct work_struct *); 1254 extern void afs_servers_timer(struct timer_list *); 1255 extern void __net_exit afs_purge_servers(struct afs_net *); 1256 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *); 1257 1258 /* 1259 * server_list.c 1260 */ 1261 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1262 { 1263 refcount_inc(&slist->usage); 1264 return slist; 1265 } 1266 1267 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1268 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *, 1269 struct afs_vldb_entry *, 1270 u8); 1271 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1272 1273 /* 1274 * super.c 1275 */ 1276 extern int __init afs_fs_init(void); 1277 extern void afs_fs_exit(void); 1278 1279 /* 1280 * vlclient.c 1281 */ 1282 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1283 const char *, int); 1284 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1285 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, 1286 struct key *, struct afs_vlserver *, unsigned int); 1287 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1288 1289 /* 1290 * vl_probe.c 1291 */ 1292 extern void afs_vlserver_probe_result(struct afs_call *); 1293 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1294 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1295 1296 /* 1297 * vl_rotate.c 1298 */ 1299 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1300 struct afs_cell *, struct key *); 1301 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1302 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1303 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1304 1305 /* 1306 * vlserver_list.c 1307 */ 1308 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1309 { 1310 atomic_inc(&vlserver->usage); 1311 return vlserver; 1312 } 1313 1314 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1315 { 1316 if (vllist) 1317 atomic_inc(&vllist->usage); 1318 return vllist; 1319 } 1320 1321 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1322 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1323 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1324 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1325 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1326 const void *, size_t); 1327 1328 /* 1329 * volume.c 1330 */ 1331 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume) 1332 { 1333 if (volume) 1334 atomic_inc(&volume->usage); 1335 return volume; 1336 } 1337 1338 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1339 extern void afs_activate_volume(struct afs_volume *); 1340 extern void afs_deactivate_volume(struct afs_volume *); 1341 extern void afs_put_volume(struct afs_cell *, struct afs_volume *); 1342 extern int afs_check_volume_status(struct afs_volume *, struct key *); 1343 1344 /* 1345 * write.c 1346 */ 1347 extern int afs_set_page_dirty(struct page *); 1348 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1349 loff_t pos, unsigned len, unsigned flags, 1350 struct page **pagep, void **fsdata); 1351 extern int afs_write_end(struct file *file, struct address_space *mapping, 1352 loff_t pos, unsigned len, unsigned copied, 1353 struct page *page, void *fsdata); 1354 extern int afs_writepage(struct page *, struct writeback_control *); 1355 extern int afs_writepages(struct address_space *, struct writeback_control *); 1356 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 1357 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1358 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1359 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1360 extern void afs_prune_wb_keys(struct afs_vnode *); 1361 extern int afs_launder_page(struct page *); 1362 1363 /* 1364 * xattr.c 1365 */ 1366 extern const struct xattr_handler *afs_xattr_handlers[]; 1367 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 1368 1369 /* 1370 * yfsclient.c 1371 */ 1372 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool); 1373 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *); 1374 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, u64, 1375 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 1376 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, u64, 1377 struct afs_fid *, struct afs_file_status *, struct afs_callback *); 1378 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 1379 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool, u64); 1380 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64); 1381 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64, 1382 struct afs_fid *, struct afs_file_status *); 1383 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, 1384 struct afs_vnode *, const char *, u64, u64); 1385 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *, 1386 pgoff_t, pgoff_t, unsigned, unsigned); 1387 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *); 1388 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *); 1389 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t); 1390 extern int yfs_fs_extend_lock(struct afs_fs_cursor *); 1391 extern int yfs_fs_release_lock(struct afs_fs_cursor *); 1392 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *, 1393 struct afs_fid *, struct afs_file_status *, 1394 struct afs_callback *, struct afs_volsync *); 1395 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *, 1396 struct afs_fid *, struct afs_status_cb *, 1397 unsigned int, struct afs_volsync *); 1398 1399 struct yfs_acl { 1400 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1401 struct afs_acl *vol_acl; /* Whole volume ACL */ 1402 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1403 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1404 unsigned int flags; 1405 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1406 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1407 }; 1408 1409 extern void yfs_free_opaque_acl(struct yfs_acl *); 1410 extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, struct yfs_acl *); 1411 extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *); 1412 1413 /* 1414 * Miscellaneous inline functions. 1415 */ 1416 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1417 { 1418 return container_of(inode, struct afs_vnode, vfs_inode); 1419 } 1420 1421 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1422 { 1423 return &vnode->vfs_inode; 1424 } 1425 1426 static inline void afs_vnode_commit_status(struct afs_fs_cursor *fc, 1427 struct afs_vnode *vnode, 1428 unsigned int cb_break) 1429 { 1430 if (fc->ac.error == 0) 1431 afs_cache_permit(vnode, fc->key, cb_break); 1432 } 1433 1434 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc, 1435 struct afs_vnode *vnode) 1436 { 1437 if (fc->ac.error == -ENOENT) { 1438 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1439 afs_break_callback(vnode); 1440 } 1441 } 1442 1443 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1444 { 1445 trace_afs_io_error(call->debug_id, -EIO, where); 1446 return -EIO; 1447 } 1448 1449 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1450 { 1451 trace_afs_file_error(vnode, -EIO, where); 1452 return -EIO; 1453 } 1454 1455 /*****************************************************************************/ 1456 /* 1457 * debug tracing 1458 */ 1459 extern unsigned afs_debug; 1460 1461 #define dbgprintk(FMT,...) \ 1462 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1463 1464 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1465 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1466 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1467 1468 1469 #if defined(__KDEBUG) 1470 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1471 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1472 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1473 1474 #elif defined(CONFIG_AFS_DEBUG) 1475 #define AFS_DEBUG_KENTER 0x01 1476 #define AFS_DEBUG_KLEAVE 0x02 1477 #define AFS_DEBUG_KDEBUG 0x04 1478 1479 #define _enter(FMT,...) \ 1480 do { \ 1481 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1482 kenter(FMT,##__VA_ARGS__); \ 1483 } while (0) 1484 1485 #define _leave(FMT,...) \ 1486 do { \ 1487 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1488 kleave(FMT,##__VA_ARGS__); \ 1489 } while (0) 1490 1491 #define _debug(FMT,...) \ 1492 do { \ 1493 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1494 kdebug(FMT,##__VA_ARGS__); \ 1495 } while (0) 1496 1497 #else 1498 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1499 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1500 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1501 #endif 1502 1503 /* 1504 * debug assertion checking 1505 */ 1506 #if 1 // defined(__KDEBUGALL) 1507 1508 #define ASSERT(X) \ 1509 do { \ 1510 if (unlikely(!(X))) { \ 1511 printk(KERN_ERR "\n"); \ 1512 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1513 BUG(); \ 1514 } \ 1515 } while(0) 1516 1517 #define ASSERTCMP(X, OP, Y) \ 1518 do { \ 1519 if (unlikely(!((X) OP (Y)))) { \ 1520 printk(KERN_ERR "\n"); \ 1521 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1522 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1523 (unsigned long)(X), (unsigned long)(Y)); \ 1524 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1525 (unsigned long)(X), (unsigned long)(Y)); \ 1526 BUG(); \ 1527 } \ 1528 } while(0) 1529 1530 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1531 do { \ 1532 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1533 printk(KERN_ERR "\n"); \ 1534 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1535 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1536 (unsigned long)(L), (unsigned long)(N), \ 1537 (unsigned long)(H)); \ 1538 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1539 (unsigned long)(L), (unsigned long)(N), \ 1540 (unsigned long)(H)); \ 1541 BUG(); \ 1542 } \ 1543 } while(0) 1544 1545 #define ASSERTIF(C, X) \ 1546 do { \ 1547 if (unlikely((C) && !(X))) { \ 1548 printk(KERN_ERR "\n"); \ 1549 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1550 BUG(); \ 1551 } \ 1552 } while(0) 1553 1554 #define ASSERTIFCMP(C, X, OP, Y) \ 1555 do { \ 1556 if (unlikely((C) && !((X) OP (Y)))) { \ 1557 printk(KERN_ERR "\n"); \ 1558 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1559 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1560 (unsigned long)(X), (unsigned long)(Y)); \ 1561 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1562 (unsigned long)(X), (unsigned long)(Y)); \ 1563 BUG(); \ 1564 } \ 1565 } while(0) 1566 1567 #else 1568 1569 #define ASSERT(X) \ 1570 do { \ 1571 } while(0) 1572 1573 #define ASSERTCMP(X, OP, Y) \ 1574 do { \ 1575 } while(0) 1576 1577 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1578 do { \ 1579 } while(0) 1580 1581 #define ASSERTIF(C, X) \ 1582 do { \ 1583 } while(0) 1584 1585 #define ASSERTIFCMP(C, X, OP, Y) \ 1586 do { \ 1587 } while(0) 1588 1589 #endif /* __KDEBUGALL */ 1590