1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* internal AFS stuff 3 * 4 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #include <linux/compiler.h> 9 #include <linux/kernel.h> 10 #include <linux/ktime.h> 11 #include <linux/fs.h> 12 #include <linux/filelock.h> 13 #include <linux/pagemap.h> 14 #include <linux/rxrpc.h> 15 #include <linux/key.h> 16 #include <linux/workqueue.h> 17 #include <linux/sched.h> 18 #include <linux/fscache.h> 19 #include <linux/backing-dev.h> 20 #include <linux/uuid.h> 21 #include <linux/mm_types.h> 22 #include <linux/dns_resolver.h> 23 #include <crypto/krb5.h> 24 #include <net/net_namespace.h> 25 #include <net/netns/generic.h> 26 #include <net/sock.h> 27 #include <net/af_rxrpc.h> 28 29 #include "afs.h" 30 #include "afs_vl.h" 31 32 #define AFS_CELL_MAX_ADDRS 15 33 34 struct afs_call; 35 struct afs_vnode; 36 struct afs_server_probe; 37 38 /* 39 * Partial file-locking emulation mode. (The problem being that AFS3 only 40 * allows whole-file locks and no upgrading/downgrading). 41 */ 42 enum afs_flock_mode { 43 afs_flock_mode_unset, 44 afs_flock_mode_local, /* Local locking only */ 45 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */ 46 afs_flock_mode_strict, /* Always get a server lock for a partial lock */ 47 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */ 48 }; 49 50 struct afs_fs_context { 51 bool force; /* T to force cell type */ 52 bool autocell; /* T if set auto mount operation */ 53 bool dyn_root; /* T if dynamic root */ 54 bool no_cell; /* T if the source is "none" (for dynroot) */ 55 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */ 56 afs_voltype_t type; /* type of volume requested */ 57 unsigned int volnamesz; /* size of volume name */ 58 const char *volname; /* name of volume to mount */ 59 struct afs_net *net; /* the AFS net namespace stuff */ 60 struct afs_cell *cell; /* cell in which to find volume */ 61 struct afs_volume *volume; /* volume record */ 62 struct key *key; /* key to use for secure mounting */ 63 }; 64 65 enum afs_call_state { 66 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */ 67 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */ 68 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */ 69 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */ 70 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */ 71 AFS_CALL_SV_REPLYING, /* Server: Replying */ 72 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */ 73 AFS_CALL_COMPLETE, /* Completed or failed */ 74 }; 75 76 /* 77 * Address preferences. 78 */ 79 struct afs_addr_preference { 80 union { 81 struct in_addr ipv4_addr; /* AF_INET address to compare against */ 82 struct in6_addr ipv6_addr; /* AF_INET6 address to compare against */ 83 }; 84 sa_family_t family; /* Which address to use */ 85 u16 prio; /* Priority */ 86 u8 subnet_mask; /* How many bits to compare */ 87 }; 88 89 struct afs_addr_preference_list { 90 struct rcu_head rcu; 91 u16 version; /* Incremented when prefs list changes */ 92 u8 ipv6_off; /* Offset of IPv6 addresses */ 93 u8 nr; /* Number of addresses in total */ 94 u8 max_prefs; /* Number of prefs allocated */ 95 struct afs_addr_preference prefs[] __counted_by(max_prefs); 96 }; 97 98 struct afs_address { 99 struct rxrpc_peer *peer; 100 short last_error; /* Last error from this address */ 101 u16 prio; /* Address priority */ 102 }; 103 104 /* 105 * List of server addresses. 106 */ 107 struct afs_addr_list { 108 struct rcu_head rcu; 109 refcount_t usage; 110 u32 version; /* Version */ 111 unsigned int debug_id; 112 unsigned int addr_pref_version; /* Version of address preference list */ 113 unsigned char max_addrs; 114 unsigned char nr_addrs; 115 unsigned char preferred; /* Preferred address */ 116 unsigned char nr_ipv4; /* Number of IPv4 addresses */ 117 enum dns_record_source source:8; 118 enum dns_lookup_status status:8; 119 unsigned long probe_failed; /* Mask of addrs that failed locally/ICMP */ 120 unsigned long responded; /* Mask of addrs that responded */ 121 struct afs_address addrs[] __counted_by(max_addrs); 122 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8)) 123 }; 124 125 /* 126 * a record of an in-progress RxRPC call 127 */ 128 struct afs_call { 129 const struct afs_call_type *type; /* type of call */ 130 wait_queue_head_t waitq; /* processes awaiting completion */ 131 struct work_struct async_work; /* async I/O processor */ 132 struct work_struct work; /* actual work processor */ 133 struct work_struct free_work; /* Deferred free processor */ 134 struct rxrpc_call *rxcall; /* RxRPC call handle */ 135 struct rxrpc_peer *peer; /* Remote endpoint */ 136 struct key *key; /* security for this call */ 137 struct afs_net *net; /* The network namespace */ 138 struct afs_server *server; /* The fileserver record if fs op (pins ref) */ 139 struct afs_vlserver *vlserver; /* The vlserver record if vl op */ 140 void *request; /* request data (first part) */ 141 size_t iov_len; /* Size of *iter to be used */ 142 struct iov_iter def_iter; /* Default buffer/data iterator */ 143 struct iov_iter *write_iter; /* Iterator defining write to be made */ 144 struct iov_iter *iter; /* Iterator currently in use */ 145 union { /* Convenience for ->def_iter */ 146 struct kvec kvec[1]; 147 struct bio_vec bvec[1]; 148 }; 149 void *buffer; /* reply receive buffer */ 150 union { 151 struct afs_endpoint_state *probe; 152 struct afs_addr_list *vl_probe; 153 struct afs_addr_list *ret_alist; 154 struct afs_vldb_entry *ret_vldb; 155 char *ret_str; 156 }; 157 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */ 158 unsigned char probe_index; /* Address in ->probe_alist */ 159 struct afs_operation *op; 160 unsigned int server_index; 161 refcount_t ref; 162 enum afs_call_state state; 163 spinlock_t state_lock; 164 int error; /* error code */ 165 u32 abort_code; /* Remote abort ID or 0 */ 166 unsigned long long remaining; /* How much is left to receive */ 167 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */ 168 unsigned request_size; /* size of request data */ 169 unsigned reply_max; /* maximum size of reply */ 170 unsigned count2; /* count used in unmarshalling */ 171 unsigned char unmarshall; /* unmarshalling phase */ 172 bool drop_ref; /* T if need to drop ref for incoming call */ 173 bool need_attention; /* T if RxRPC poked us */ 174 bool async; /* T if asynchronous */ 175 bool upgrade; /* T to request service upgrade */ 176 bool intr; /* T if interruptible */ 177 bool unmarshalling_error; /* T if an unmarshalling error occurred */ 178 bool responded; /* Got a response from the call (may be abort) */ 179 u8 security_ix; /* Security class */ 180 u16 service_id; /* Actual service ID (after upgrade) */ 181 unsigned int debug_id; /* Trace ID */ 182 u32 enctype; /* Security encoding type */ 183 u32 operation_ID; /* operation ID for an incoming call */ 184 u32 count; /* count for use in unmarshalling */ 185 union { /* place to extract temporary data */ 186 struct { 187 __be32 tmp_u; 188 __be32 tmp; 189 } __attribute__((packed)); 190 __be64 tmp64; 191 }; 192 ktime_t issue_time; /* Time of issue of operation */ 193 }; 194 195 struct afs_call_type { 196 const char *name; 197 unsigned int op; /* Really enum afs_fs_operation */ 198 199 /* deliver request or reply data to an call 200 * - returning an error will cause the call to be aborted 201 */ 202 int (*deliver)(struct afs_call *call); 203 204 /* clean up a call */ 205 void (*destructor)(struct afs_call *call); 206 207 /* Async receive processing function */ 208 void (*async_rx)(struct work_struct *work); 209 210 /* Work function */ 211 void (*work)(struct work_struct *work); 212 213 /* Call done function (gets called immediately on success or failure) */ 214 void (*done)(struct afs_call *call); 215 216 /* Handle a call being immediately cancelled. */ 217 void (*immediate_cancel)(struct afs_call *call); 218 }; 219 220 /* 221 * Key available for writeback on a file. 222 */ 223 struct afs_wb_key { 224 refcount_t usage; 225 struct key *key; 226 struct list_head vnode_link; /* Link in vnode->wb_keys */ 227 }; 228 229 /* 230 * AFS open file information record. Pointed to by file->private_data. 231 */ 232 struct afs_file { 233 struct key *key; /* The key this file was opened with */ 234 struct afs_wb_key *wb; /* Writeback key record for this file */ 235 }; 236 237 static inline struct key *afs_file_key(struct file *file) 238 { 239 struct afs_file *af = file->private_data; 240 241 return af->key; 242 } 243 244 /* 245 * AFS superblock private data 246 * - there's one superblock per volume 247 */ 248 struct afs_super_info { 249 struct net *net_ns; /* Network namespace */ 250 struct afs_cell *cell; /* The cell in which the volume resides */ 251 struct afs_volume *volume; /* volume record */ 252 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 253 bool dyn_root; /* True if dynamic root */ 254 /* afs_atcell_get_link() reads ->net_ns in rcu pathwalk */ 255 struct rcu_head rcu; 256 }; 257 258 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 259 { 260 return sb->s_fs_info; 261 } 262 263 extern struct file_system_type afs_fs_type; 264 265 /* 266 * Set of substitutes for @sys. 267 */ 268 struct afs_sysnames { 269 #define AFS_NR_SYSNAME 16 270 char *subs[AFS_NR_SYSNAME]; 271 refcount_t usage; 272 unsigned short nr; 273 char blank[1]; 274 }; 275 276 /* 277 * AFS network namespace record. 278 */ 279 struct afs_net { 280 struct net *net; /* Backpointer to the owning net namespace */ 281 struct afs_uuid uuid; 282 bool live; /* F if this namespace is being removed */ 283 284 /* AF_RXRPC I/O stuff */ 285 struct socket *socket; 286 struct afs_call *spare_incoming_call; 287 struct work_struct charge_preallocation_work; 288 struct work_struct rx_oob_work; 289 struct mutex socket_mutex; 290 atomic_t nr_outstanding_calls; 291 atomic_t nr_superblocks; 292 293 /* Cell database */ 294 struct rb_root cells; 295 struct idr cells_dyn_ino; /* cell->dynroot_ino mapping */ 296 struct afs_cell __rcu *ws_cell; 297 atomic_t cells_outstanding; 298 struct rw_semaphore cells_lock; 299 struct mutex cells_alias_lock; 300 301 struct mutex proc_cells_lock; 302 struct hlist_head proc_cells; 303 304 /* Known servers. Theoretically each fileserver can only be in one 305 * cell, but in practice, people create aliases and subsets and there's 306 * no easy way to distinguish them. 307 */ 308 seqlock_t fs_lock; /* For fs_probe_*, fs_proc */ 309 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */ 310 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */ 311 struct hlist_head fs_proc; /* procfs servers list */ 312 313 struct key *fs_cm_token_key; /* Key for creating CM tokens */ 314 struct work_struct fs_prober; 315 struct timer_list fs_probe_timer; 316 atomic_t servers_outstanding; 317 318 /* File locking renewal management */ 319 struct mutex lock_manager_mutex; 320 321 /* Misc */ 322 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 323 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 324 struct afs_sysnames *sysnames; 325 rwlock_t sysnames_lock; 326 struct afs_addr_preference_list __rcu *address_prefs; 327 u16 address_pref_version; 328 329 /* Statistics counters */ 330 atomic_t n_lookup; /* Number of lookups done */ 331 atomic_t n_reval; /* Number of dentries needing revalidation */ 332 atomic_t n_inval; /* Number of invalidations by the server */ 333 atomic_t n_relpg; /* Number of invalidations by release_folio */ 334 atomic_t n_read_dir; /* Number of directory pages read */ 335 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 336 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 337 atomic_t n_stores; /* Number of store ops */ 338 atomic_long_t n_store_bytes; /* Number of bytes stored */ 339 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 340 atomic_t n_fetches; /* Number of data fetch ops */ 341 }; 342 343 extern const char afs_init_sysname[]; 344 345 enum afs_cell_state { 346 AFS_CELL_SETTING_UP, 347 AFS_CELL_UNLOOKED, 348 AFS_CELL_ACTIVE, 349 AFS_CELL_REMOVING, 350 AFS_CELL_DEAD, 351 }; 352 353 /* 354 * AFS cell record. 355 * 356 * This is a tricky concept to get right as it is possible to create aliases 357 * simply by pointing AFSDB/SRV records for two names at the same set of VL 358 * servers; it is also possible to do things like setting up two sets of VL 359 * servers, one of which provides a superset of the volumes provided by the 360 * other (for internal/external division, for example). 361 * 362 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 363 * servers and (b) a cell's name is used by the client to select the key to use 364 * for authentication and encryption. The cell name is not typically used in 365 * the protocol. 366 * 367 * Two cells are determined to be aliases if they have an explicit alias (YFS 368 * only), share any VL servers in common or have at least one volume in common. 369 * "In common" means that the address list of the VL servers or the fileservers 370 * share at least one endpoint. 371 */ 372 struct afs_cell { 373 union { 374 struct rcu_head rcu; 375 struct rb_node net_node; /* Node in net->cells */ 376 }; 377 struct afs_net *net; 378 struct afs_cell *alias_of; /* The cell this is an alias of */ 379 struct afs_volume *root_volume; /* The root.cell volume if there is one */ 380 struct key *anonymous_key; /* anonymous user key for this cell */ 381 struct work_struct destroyer; /* Destroyer for cell */ 382 struct work_struct manager; /* Manager for init/deinit/dns */ 383 struct timer_list management_timer; /* General management timer */ 384 struct hlist_node proc_link; /* /proc cell list link */ 385 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 386 time64_t last_inactive; /* Time of last drop of usage count */ 387 refcount_t ref; /* Struct refcount */ 388 atomic_t active; /* Active usage counter */ 389 unsigned long flags; 390 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 391 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 392 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */ 393 #define AFS_CELL_FL_HAVE_INO 3 /* Have dynroot_ino */ 394 enum afs_cell_state state; 395 short error; 396 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 397 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 398 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 399 unsigned int debug_id; 400 unsigned int dynroot_ino; /* Inode numbers for dynroot (a pair) */ 401 402 /* The volumes belonging to this cell */ 403 struct rw_semaphore vs_lock; /* Lock for server->volumes */ 404 struct rb_root volumes; /* Tree of volumes on this server */ 405 struct hlist_head proc_volumes; /* procfs volume list */ 406 seqlock_t volume_lock; /* For volumes */ 407 408 /* Active fileserver interaction state. */ 409 struct rb_root fs_servers; /* afs_server (by server UUID) */ 410 struct rw_semaphore fs_lock; /* For fs_servers */ 411 412 /* VL server list. */ 413 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 414 struct afs_vlserver_list __rcu *vl_servers; 415 416 u8 name_len; /* Length of name */ 417 char *name; /* Cell name, case-flattened and NUL-padded */ 418 char *key_desc; /* Authentication key description */ 419 }; 420 421 /* 422 * Volume Location server record. 423 */ 424 struct afs_vlserver { 425 struct rcu_head rcu; 426 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 427 unsigned long flags; 428 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 429 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 430 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 431 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */ 432 rwlock_t lock; /* Lock on addresses */ 433 refcount_t ref; 434 unsigned int rtt; /* Server's current RTT in uS */ 435 unsigned int debug_id; 436 437 /* Probe state */ 438 wait_queue_head_t probe_wq; 439 atomic_t probe_outstanding; 440 spinlock_t probe_lock; 441 struct { 442 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */ 443 u32 abort_code; 444 short error; 445 unsigned short flags; 446 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */ 447 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */ 448 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */ 449 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */ 450 } probe; 451 452 u16 service_id; /* Service ID we're using */ 453 u16 port; 454 u16 name_len; /* Length of name */ 455 char name[]; /* Server name, case-flattened */ 456 }; 457 458 /* 459 * Weighted list of Volume Location servers. 460 */ 461 struct afs_vlserver_entry { 462 u16 priority; /* Preference (as SRV) */ 463 u16 weight; /* Weight (as SRV) */ 464 enum dns_record_source source:8; 465 enum dns_lookup_status status:8; 466 struct afs_vlserver *server; 467 }; 468 469 struct afs_vlserver_list { 470 struct rcu_head rcu; 471 refcount_t ref; 472 u8 nr_servers; 473 u8 index; /* Server currently in use */ 474 u8 preferred; /* Preferred server */ 475 enum dns_record_source source:8; 476 enum dns_lookup_status status:8; 477 rwlock_t lock; 478 struct afs_vlserver_entry servers[]; 479 }; 480 481 /* 482 * Cached VLDB entry. 483 * 484 * This is pointed to by cell->vldb_entries, indexed by name. 485 */ 486 struct afs_vldb_entry { 487 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 488 489 unsigned long flags; 490 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 491 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 492 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 493 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 494 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 495 496 uuid_t fs_server[AFS_NMAXNSERVERS]; 497 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */ 498 u8 fs_mask[AFS_NMAXNSERVERS]; 499 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 500 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 501 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 502 u8 vlsf_flags[AFS_NMAXNSERVERS]; 503 short error; 504 u8 nr_servers; /* Number of server records */ 505 u8 name_len; 506 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 507 }; 508 509 /* 510 * Fileserver endpoint state. The records the addresses of a fileserver's 511 * endpoints and the state and result of a round of probing on them. This 512 * allows the rotation algorithm to access those results without them being 513 * erased by a subsequent round of probing. 514 */ 515 struct afs_endpoint_state { 516 struct rcu_head rcu; 517 struct afs_addr_list *addresses; /* The addresses being probed */ 518 unsigned long responsive_set; /* Bitset of responsive endpoints */ 519 unsigned long failed_set; /* Bitset of endpoints we failed to probe */ 520 refcount_t ref; 521 unsigned int server_id; /* Debug ID of server */ 522 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */ 523 atomic_t nr_probing; /* Number of outstanding probes */ 524 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */ 525 s32 abort_code; 526 short error; 527 unsigned long flags; 528 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */ 529 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */ 530 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */ 531 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */ 532 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */ 533 }; 534 535 /* 536 * Record of fileserver with which we're actively communicating. 537 */ 538 struct afs_server { 539 struct rcu_head rcu; 540 union { 541 uuid_t uuid; /* Server ID */ 542 struct afs_uuid _uuid; 543 }; 544 545 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 546 struct rb_node uuid_rb; /* Link in cell->fs_servers */ 547 struct list_head probe_link; /* Link in net->fs_probe_* */ 548 struct hlist_node proc_link; /* Link in net->fs_proc */ 549 struct list_head volumes; /* RCU list of afs_server_entry objects */ 550 struct work_struct destroyer; /* Work item to try and destroy a server */ 551 struct timer_list timer; /* Management timer */ 552 struct mutex cm_token_lock; /* Lock governing creation of appdata */ 553 struct krb5_buffer cm_rxgk_appdata; /* Appdata to be included in RESPONSE packet */ 554 time64_t unuse_time; /* Time at which last unused */ 555 unsigned long flags; 556 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 557 #define AFS_SERVER_FL_UPDATING 1 558 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 559 #define AFS_SERVER_FL_UNCREATED 3 /* The record needs creating */ 560 #define AFS_SERVER_FL_CREATING 4 /* The record is being created */ 561 #define AFS_SERVER_FL_EXPIRED 5 /* The record has expired */ 562 #define AFS_SERVER_FL_NOT_FOUND 6 /* VL server says no such server */ 563 #define AFS_SERVER_FL_VL_FAIL 7 /* Failed to access VL server */ 564 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 565 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 566 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 567 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 568 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */ 569 #define AFS_SERVER_FL_NO_RENAME2 20 /* YFS Fileserver doesn't support enhanced rename */ 570 refcount_t ref; /* Object refcount */ 571 atomic_t active; /* Active user count */ 572 u32 addr_version; /* Address list version */ 573 u16 service_id; /* Service ID we're using. */ 574 short create_error; /* Creation error */ 575 unsigned int rtt; /* Server's current RTT in uS */ 576 unsigned int debug_id; /* Debugging ID for traces */ 577 578 /* file service access */ 579 rwlock_t fs_lock; /* access lock */ 580 581 /* Probe state */ 582 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */ 583 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 584 wait_queue_head_t probe_wq; 585 unsigned int probe_counter; /* Number of probes issued */ 586 spinlock_t probe_lock; 587 }; 588 589 enum afs_ro_replicating { 590 AFS_RO_NOT_REPLICATING, /* Not doing replication */ 591 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */ 592 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */ 593 } __mode(byte); 594 595 /* 596 * Replaceable volume server list. 597 */ 598 struct afs_server_entry { 599 struct afs_server *server; 600 struct afs_volume *volume; 601 struct list_head slink; /* Link in server->volumes */ 602 time64_t cb_expires_at; /* Time at which volume-level callback expires */ 603 unsigned long flags; 604 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */ 605 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */ 606 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */ 607 }; 608 609 struct afs_server_list { 610 struct rcu_head rcu; 611 refcount_t usage; 612 bool attached; /* T if attached to servers */ 613 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */ 614 unsigned char nr_servers; 615 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 616 unsigned int seq; /* Set to ->servers_seq when installed */ 617 rwlock_t lock; 618 struct afs_server_entry servers[]; 619 }; 620 621 /* 622 * Live AFS volume management. 623 */ 624 struct afs_volume { 625 struct rcu_head rcu; 626 afs_volid_t vid; /* The volume ID of this volume */ 627 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */ 628 refcount_t ref; 629 unsigned int debug_id; /* Debugging ID for traces */ 630 time64_t update_at; /* Time at which to next update */ 631 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 632 struct rb_node cell_node; /* Link in cell->volumes */ 633 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 634 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 635 struct work_struct destructor; /* Deferred destructor */ 636 unsigned long flags; 637 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 638 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 639 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 640 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 641 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */ 642 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */ 643 #ifdef CONFIG_AFS_FSCACHE 644 struct fscache_volume *cache; /* Caching cookie */ 645 #endif 646 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 647 rwlock_t servers_lock; /* Lock for ->servers */ 648 unsigned int servers_seq; /* Incremented each time ->servers changes */ 649 650 /* RO release tracking */ 651 struct mutex volsync_lock; /* Time/state evaluation lock */ 652 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */ 653 time64_t update_time; /* Volume update time (or TIME64_MIN) */ 654 655 /* Callback management */ 656 struct mutex cb_check_lock; /* Lock to control race to check after v_break */ 657 time64_t cb_expires_at; /* Earliest volume callback expiry time */ 658 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */ 659 atomic_t cb_v_break; /* Volume-break event counter. */ 660 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */ 661 atomic_t cb_scrub; /* Scrub-all-data event counter. */ 662 rwlock_t cb_v_break_lock; 663 struct rw_semaphore open_mmaps_lock; 664 struct list_head open_mmaps; /* List of vnodes that are mmapped */ 665 666 afs_voltype_t type; /* type of volume */ 667 char type_force; /* force volume type (suppress R/O -> R/W) */ 668 u8 name_len; 669 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 670 }; 671 672 enum afs_lock_state { 673 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 674 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 675 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 676 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 677 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 678 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 679 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 680 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 681 }; 682 683 /* 684 * AFS inode private data. 685 * 686 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 687 * leak from one inode to another. 688 */ 689 struct afs_vnode { 690 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 691 struct afs_volume *volume; /* volume on which vnode resides */ 692 struct afs_fid fid; /* the file identifier for this inode */ 693 struct afs_file_status status; /* AFS status info for this file */ 694 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 695 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 696 struct list_head io_lock_waiters; /* Threads waiting for the I/O lock */ 697 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 698 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 699 struct key *silly_key; /* Silly rename key */ 700 spinlock_t wb_lock; /* lock for wb_keys */ 701 spinlock_t lock; /* waitqueue/flags lock */ 702 unsigned long flags; 703 #define AFS_VNODE_IO_LOCK 0 /* Set if the I/O serialisation lock is held */ 704 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 705 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 706 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 707 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 708 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 709 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 710 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 711 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */ 712 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */ 713 #define AFS_VNODE_DIR_READ 11 /* Set if we've read a dir's contents */ 714 715 struct folio_queue *directory; /* Directory contents */ 716 struct afs_symlink __rcu *symlink; /* Symlink content */ 717 struct list_head wb_keys; /* List of keys available for writeback */ 718 struct list_head pending_locks; /* locks waiting to be granted */ 719 struct list_head granted_locks; /* locks granted on this file */ 720 struct delayed_work lock_work; /* work to be done in locking */ 721 struct key *lock_key; /* Key to be used in lock ops */ 722 ktime_t locked_at; /* Time at which lock obtained */ 723 enum afs_lock_state lock_state : 8; 724 afs_lock_type_t lock_type : 8; 725 unsigned int directory_size; /* Amount of space in ->directory */ 726 727 /* outstanding callback notification on this file */ 728 struct work_struct cb_work; /* Work for mmap'd files */ 729 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */ 730 void *cb_server; /* Server with callback/filelock */ 731 atomic_t cb_nr_mmap; /* Number of mmaps */ 732 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */ 733 unsigned int cb_scrub; /* Scrub counter on ->volume */ 734 unsigned int cb_break; /* Break counter on vnode */ 735 unsigned int cb_v_check; /* Break check counter on ->volume */ 736 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 737 738 atomic64_t cb_expires_at; /* time at which callback expires */ 739 #define AFS_NO_CB_PROMISE TIME64_MIN 740 }; 741 742 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 743 { 744 #ifdef CONFIG_AFS_FSCACHE 745 return netfs_i_cookie(&vnode->netfs); 746 #else 747 return NULL; 748 #endif 749 } 750 751 static inline void afs_vnode_set_cache(struct afs_vnode *vnode, 752 struct fscache_cookie *cookie) 753 { 754 #ifdef CONFIG_AFS_FSCACHE 755 vnode->netfs.cache = cookie; 756 #endif 757 } 758 759 /* 760 * cached security record for one user's attempt to access a vnode 761 */ 762 struct afs_permit { 763 struct key *key; /* RxRPC ticket holding a security context */ 764 afs_access_t access; /* CallerAccess value for this key */ 765 }; 766 767 /* 768 * Immutable cache of CallerAccess records from attempts to access vnodes. 769 * These may be shared between multiple vnodes. 770 */ 771 struct afs_permits { 772 struct rcu_head rcu; 773 struct hlist_node hash_node; /* Link in hash */ 774 unsigned long h; /* Hash value for this permit list */ 775 refcount_t usage; 776 unsigned short nr_permits; /* Number of records */ 777 bool invalidated; /* Invalidated due to key change */ 778 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */ 779 }; 780 781 /* 782 * Copy of symlink content for normal use. 783 */ 784 struct afs_symlink { 785 struct rcu_head rcu; 786 refcount_t ref; 787 char content[]; 788 }; 789 790 /* 791 * Error prioritisation and accumulation. 792 */ 793 struct afs_error { 794 s32 abort_code; /* Cumulative abort code */ 795 short error; /* Cumulative error */ 796 bool responded; /* T if server responded */ 797 bool aborted; /* T if ->error is from an abort */ 798 }; 799 800 /* 801 * Cursor for iterating over a set of volume location servers. 802 */ 803 struct afs_vl_cursor { 804 struct afs_cell *cell; /* The cell we're querying */ 805 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 806 struct afs_vlserver *server; /* Server on which this resides */ 807 struct afs_addr_list *alist; /* Current address list (pins ref) */ 808 struct key *key; /* Key for the server */ 809 unsigned long untried_servers; /* Bitmask of untried servers */ 810 unsigned long addr_tried; /* Tried addresses */ 811 struct afs_error cumul_error; /* Cumulative error */ 812 unsigned int debug_id; 813 s32 call_abort_code; 814 short call_error; /* Error from single call */ 815 short server_index; /* Current server */ 816 signed char addr_index; /* Current address */ 817 unsigned short flags; 818 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 819 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 820 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 821 short nr_iterations; /* Number of server iterations */ 822 bool call_responded; /* T if the current address responded */ 823 }; 824 825 /* 826 * Fileserver state tracking for an operation. An array of these is kept, 827 * indexed by server index. 828 */ 829 struct afs_server_state { 830 /* Tracking of fileserver probe state. Other operations may interfere 831 * by probing a fileserver when accessing other volumes. 832 */ 833 unsigned int probe_seq; 834 unsigned long untried_addrs; /* Addresses we haven't tried yet */ 835 struct wait_queue_entry probe_waiter; 836 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */ 837 }; 838 839 /* 840 * Fileserver operation methods. 841 */ 842 struct afs_operation_ops { 843 void (*issue_afs_rpc)(struct afs_operation *op); 844 void (*issue_yfs_rpc)(struct afs_operation *op); 845 void (*success)(struct afs_operation *op); 846 void (*aborted)(struct afs_operation *op); 847 void (*failed)(struct afs_operation *op); 848 void (*edit_dir)(struct afs_operation *op); 849 void (*put)(struct afs_operation *op); 850 }; 851 852 struct afs_vnode_param { 853 struct afs_vnode *vnode; 854 struct afs_fid fid; /* Fid to access */ 855 struct afs_status_cb scb; /* Returned status and callback promise */ 856 afs_dataversion_t dv_before; /* Data version before the call */ 857 unsigned int cb_break_before; /* cb_break before the call */ 858 u8 dv_delta; /* Expected change in data version */ 859 bool put_vnode:1; /* T if we have a ref on the vnode */ 860 bool need_io_lock:1; /* T if we need the I/O lock on this */ 861 bool update_ctime:1; /* Need to update the ctime */ 862 bool set_size:1; /* Must update i_size */ 863 bool op_unlinked:1; /* True if file was unlinked by op */ 864 bool speculative:1; /* T if speculative status fetch (no vnode lock) */ 865 bool modification:1; /* Set if the content gets modified */ 866 }; 867 868 /* 869 * Fileserver operation wrapper, handling server and address rotation 870 * asynchronously. May make simultaneous calls to multiple servers. 871 */ 872 struct afs_operation { 873 struct afs_net *net; /* Network namespace */ 874 struct key *key; /* Key for the cell */ 875 const struct afs_call_type *type; /* Type of call done */ 876 const struct afs_operation_ops *ops; 877 878 /* Parameters/results for the operation */ 879 struct afs_volume *volume; /* Volume being accessed */ 880 struct afs_vnode_param file[2]; 881 struct afs_vnode_param *more_files; 882 struct afs_volsync pre_volsync; /* Volsync before op */ 883 struct afs_volsync volsync; /* Volsync returned by op */ 884 struct dentry *dentry; /* Dentry to be altered */ 885 struct dentry *dentry_2; /* Second dentry to be altered */ 886 struct timespec64 mtime; /* Modification time to record */ 887 struct timespec64 ctime; /* Change time to set */ 888 struct afs_error cumul_error; /* Cumulative error */ 889 short nr_files; /* Number of entries in file[], more_files */ 890 unsigned int debug_id; 891 892 unsigned int cb_v_break; /* Volume break counter before op */ 893 894 union { 895 struct { 896 int which; /* Which ->file[] to fetch for */ 897 } fetch_status; 898 struct { 899 int reason; /* enum afs_edit_dir_reason */ 900 mode_t mode; 901 struct afs_symlink *symlink; 902 } create; 903 struct { 904 bool need_rehash; 905 } unlink; 906 struct { 907 struct dentry *rehash; 908 struct dentry *tmp; 909 unsigned int rename_flags; 910 bool new_negative; 911 } rename; 912 struct { 913 struct netfs_io_subrequest *subreq; 914 } fetch; 915 struct { 916 afs_lock_type_t type; 917 } lock; 918 struct { 919 struct iov_iter *write_iter; 920 loff_t pos; 921 loff_t size; 922 loff_t i_size; 923 } store; 924 struct { 925 struct iattr *attr; 926 loff_t old_i_size; 927 } setattr; 928 struct afs_acl *acl; 929 struct yfs_acl *yacl; 930 struct { 931 struct afs_volume_status vs; 932 struct kstatfs *buf; 933 } volstatus; 934 }; 935 936 /* Fileserver iteration state */ 937 struct afs_server_list *server_list; /* Current server list (pins ref) */ 938 struct afs_server *server; /* Server we're using (ref pinned by server_list) */ 939 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */ 940 struct afs_server_state *server_states; /* States of the servers involved */ 941 struct afs_call *call; 942 unsigned long untried_servers; /* Bitmask of untried servers */ 943 unsigned long addr_tried; /* Tried addresses */ 944 s32 call_abort_code; /* Abort code from single call */ 945 short call_error; /* Error from single call */ 946 short server_index; /* Current server */ 947 short nr_iterations; /* Number of server iterations */ 948 signed char addr_index; /* Current address */ 949 bool call_responded; /* T if the current address responded */ 950 951 unsigned int flags; 952 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */ 953 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */ 954 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */ 955 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */ 956 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 957 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 958 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */ 959 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */ 960 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */ 961 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */ 962 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */ 963 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */ 964 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */ 965 #define AFS_OPERATION_ASYNC 0x2000 /* Set if should run asynchronously */ 966 }; 967 968 /* 969 * Cache auxiliary data. 970 */ 971 struct afs_vnode_cache_aux { 972 __be64 data_version; 973 } __packed; 974 975 static inline void afs_set_cache_aux(struct afs_vnode *vnode, 976 struct afs_vnode_cache_aux *aux) 977 { 978 aux->data_version = cpu_to_be64(vnode->status.data_version); 979 } 980 981 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags) 982 { 983 struct afs_vnode_cache_aux aux; 984 985 afs_set_cache_aux(vnode, &aux); 986 fscache_invalidate(afs_vnode_cache(vnode), &aux, 987 i_size_read(&vnode->netfs.inode), flags); 988 } 989 990 /* 991 * Directory iteration management. 992 */ 993 struct afs_dir_iter { 994 struct afs_vnode *dvnode; 995 union afs_xdr_dir_block *block; 996 struct folio_queue *fq; 997 unsigned int fpos; 998 int fq_slot; 999 unsigned int loop_check; 1000 u8 nr_slots; 1001 u8 bucket; 1002 unsigned int prev_entry; 1003 }; 1004 1005 #include <trace/events/afs.h> 1006 1007 /*****************************************************************************/ 1008 /* 1009 * addr_list.c 1010 */ 1011 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 1012 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr); 1013 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 1014 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 1015 const char *, size_t, char, 1016 unsigned short, unsigned short); 1017 bool afs_addr_list_same(const struct afs_addr_list *a, 1018 const struct afs_addr_list *b); 1019 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 1020 1021 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr, 1022 __be32 xdr, u16 port); 1023 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr, 1024 __be32 *xdr, u16 port); 1025 void afs_set_peer_appdata(struct afs_server *server, 1026 struct afs_addr_list *old_alist, 1027 struct afs_addr_list *new_alist); 1028 1029 /* 1030 * addr_prefs.c 1031 */ 1032 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size); 1033 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist); 1034 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist); 1035 1036 /* 1037 * callback.c 1038 */ 1039 extern void afs_invalidate_mmap_work(struct work_struct *); 1040 extern void afs_init_callback_state(struct afs_server *); 1041 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1042 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1043 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 1044 1045 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 1046 { 1047 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub; 1048 } 1049 1050 static inline bool afs_cb_is_broken(unsigned int cb_break, 1051 const struct afs_vnode *vnode) 1052 { 1053 return cb_break != (vnode->cb_break + 1054 atomic_read(&vnode->volume->cb_ro_snapshot) + 1055 atomic_read(&vnode->volume->cb_scrub)); 1056 } 1057 1058 /* 1059 * cell.c 1060 */ 1061 extern int afs_cell_init(struct afs_net *, const char *); 1062 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned, 1063 enum afs_cell_trace); 1064 enum afs_lookup_cell_for { 1065 AFS_LOOKUP_CELL_DYNROOT, 1066 AFS_LOOKUP_CELL_MOUNTPOINT, 1067 AFS_LOOKUP_CELL_DIRECT_MOUNT, 1068 AFS_LOOKUP_CELL_PRELOAD, 1069 AFS_LOOKUP_CELL_ROOTCELL, 1070 AFS_LOOKUP_CELL_ALIAS_CHECK, 1071 }; 1072 struct afs_cell *afs_lookup_cell(struct afs_net *net, 1073 const char *name, unsigned int namesz, 1074 const char *vllist, 1075 enum afs_lookup_cell_for reason, 1076 enum afs_cell_trace trace); 1077 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace); 1078 void afs_unuse_cell(struct afs_cell *cell, enum afs_cell_trace reason); 1079 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace); 1080 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace); 1081 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace); 1082 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace); 1083 void afs_set_cell_timer(struct afs_cell *cell, unsigned int delay_secs); 1084 extern void __net_exit afs_cell_purge(struct afs_net *); 1085 1086 /* 1087 * cmservice.c 1088 */ 1089 extern bool afs_cm_incoming_call(struct afs_call *); 1090 1091 /* 1092 * cm_security.c 1093 */ 1094 void afs_process_oob_queue(struct work_struct *work); 1095 #ifdef CONFIG_RXGK 1096 int afs_create_token_key(struct afs_net *net, struct socket *socket); 1097 #else 1098 static inline int afs_create_token_key(struct afs_net *net, struct socket *socket) 1099 { 1100 return 0; 1101 } 1102 #endif 1103 1104 /* 1105 * dir.c 1106 */ 1107 extern const struct file_operations afs_dir_file_operations; 1108 extern const struct inode_operations afs_dir_inode_operations; 1109 extern const struct address_space_operations afs_dir_aops; 1110 extern const struct dentry_operations afs_fs_dentry_operations; 1111 1112 ssize_t afs_read_dir(struct afs_vnode *dvnode, struct file *file) 1113 __acquires(&dvnode->validate_lock); 1114 extern void afs_d_release(struct dentry *); 1115 extern void afs_check_for_remote_deletion(struct afs_operation *); 1116 1117 /* 1118 * dir_edit.c 1119 */ 1120 extern void afs_edit_dir_add(struct afs_vnode *, const struct qstr *, struct afs_fid *, 1121 enum afs_edit_dir_reason); 1122 extern void afs_edit_dir_remove(struct afs_vnode *, const struct qstr *, enum afs_edit_dir_reason); 1123 void afs_edit_dir_update(struct afs_vnode *vnode, const struct qstr *name, 1124 struct afs_vnode *new_dvnode, enum afs_edit_dir_reason why); 1125 void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode); 1126 1127 /* 1128 * dir_search.c 1129 */ 1130 unsigned int afs_dir_hash_name(const struct qstr *name); 1131 bool afs_dir_init_iter(struct afs_dir_iter *iter, const struct qstr *name); 1132 union afs_xdr_dir_block *afs_dir_find_block(struct afs_dir_iter *iter, size_t block); 1133 int afs_dir_search_bucket(struct afs_dir_iter *iter, const struct qstr *name, 1134 struct afs_fid *_fid); 1135 int afs_dir_search(struct afs_vnode *dvnode, const struct qstr *name, 1136 struct afs_fid *_fid, afs_dataversion_t *_dir_version); 1137 1138 static inline void afs_dir_end_iter(struct afs_dir_iter *iter) 1139 { 1140 if (iter->block) { 1141 kunmap_local(iter->block); 1142 iter->block = NULL; 1143 } 1144 } 1145 1146 /* 1147 * dir_silly.c 1148 */ 1149 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 1150 struct dentry *, struct key *); 1151 extern int afs_silly_iput(struct dentry *, struct inode *); 1152 1153 /* 1154 * dynroot.c 1155 */ 1156 extern const struct inode_operations afs_dynroot_inode_operations; 1157 extern const struct dentry_operations afs_dynroot_dentry_operations; 1158 1159 struct inode *afs_dynroot_iget_root(struct super_block *sb); 1160 1161 /* 1162 * file.c 1163 */ 1164 extern const struct address_space_operations afs_file_aops; 1165 extern const struct inode_operations afs_file_inode_operations; 1166 extern const struct file_operations afs_file_operations; 1167 extern const struct afs_operation_ops afs_fetch_data_operation; 1168 extern const struct netfs_request_ops afs_req_ops; 1169 1170 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 1171 extern void afs_put_wb_key(struct afs_wb_key *); 1172 extern int afs_open(struct inode *, struct file *); 1173 extern int afs_release(struct inode *, struct file *); 1174 void afs_fetch_data_async_rx(struct work_struct *work); 1175 void afs_fetch_data_immediate_cancel(struct afs_call *call); 1176 void afs_set_i_size(struct afs_vnode *vnode, loff_t new_i_size); 1177 1178 /* 1179 * flock.c 1180 */ 1181 extern struct workqueue_struct *afs_lock_manager; 1182 1183 extern void afs_lock_op_done(struct afs_call *); 1184 extern void afs_lock_work(struct work_struct *); 1185 extern void afs_lock_may_be_available(struct afs_vnode *); 1186 extern int afs_lock(struct file *, int, struct file_lock *); 1187 extern int afs_flock(struct file *, int, struct file_lock *); 1188 1189 /* 1190 * fsclient.c 1191 */ 1192 extern void afs_fs_fetch_status(struct afs_operation *); 1193 extern void afs_fs_fetch_data(struct afs_operation *); 1194 extern void afs_fs_create_file(struct afs_operation *); 1195 extern void afs_fs_make_dir(struct afs_operation *); 1196 extern void afs_fs_remove_file(struct afs_operation *); 1197 extern void afs_fs_remove_dir(struct afs_operation *); 1198 extern void afs_fs_link(struct afs_operation *); 1199 extern void afs_fs_symlink(struct afs_operation *); 1200 extern void afs_fs_rename(struct afs_operation *); 1201 extern void afs_fs_store_data(struct afs_operation *); 1202 extern void afs_fs_setattr(struct afs_operation *); 1203 extern void afs_fs_get_volume_status(struct afs_operation *); 1204 extern void afs_fs_set_lock(struct afs_operation *); 1205 extern void afs_fs_extend_lock(struct afs_operation *); 1206 extern void afs_fs_release_lock(struct afs_operation *); 1207 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server, 1208 struct afs_address *addr, struct key *key); 1209 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server, 1210 struct afs_endpoint_state *estate, unsigned int addr_index, 1211 struct key *key); 1212 extern void afs_fs_inline_bulk_status(struct afs_operation *); 1213 1214 struct afs_acl { 1215 u32 size; 1216 u8 data[] __counted_by(size); 1217 }; 1218 1219 extern void afs_fs_fetch_acl(struct afs_operation *); 1220 extern void afs_fs_store_acl(struct afs_operation *); 1221 1222 /* 1223 * fs_operation.c 1224 */ 1225 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *); 1226 extern int afs_put_operation(struct afs_operation *); 1227 extern bool afs_begin_vnode_operation(struct afs_operation *); 1228 extern void afs_end_vnode_operation(struct afs_operation *op); 1229 extern void afs_wait_for_operation(struct afs_operation *); 1230 extern int afs_do_sync_operation(struct afs_operation *); 1231 1232 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1233 struct afs_vnode *vnode) 1234 { 1235 op->file[n].vnode = vnode; 1236 op->file[n].need_io_lock = true; 1237 } 1238 1239 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1240 const struct afs_fid *fid) 1241 { 1242 op->file[n].fid = *fid; 1243 } 1244 1245 /* 1246 * fs_probe.c 1247 */ 1248 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate, 1249 enum afs_estate_trace where); 1250 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where); 1251 extern void afs_fileserver_probe_result(struct afs_call *); 1252 int afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server, 1253 struct afs_addr_list *new_alist, struct key *key); 1254 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr); 1255 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1256 extern void afs_fs_probe_dispatcher(struct work_struct *); 1257 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate, 1258 unsigned long exclude, bool is_intr); 1259 extern void afs_fs_probe_cleanup(struct afs_net *); 1260 1261 /* 1262 * inode.c 1263 */ 1264 extern const struct afs_operation_ops afs_fetch_status_operation; 1265 1266 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1267 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1268 extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1269 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *); 1270 extern struct inode *afs_root_iget(struct super_block *, struct key *); 1271 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *, 1272 struct kstat *, u32, unsigned int); 1273 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *); 1274 extern void afs_evict_inode(struct inode *); 1275 extern int afs_drop_inode(struct inode *); 1276 1277 /* 1278 * main.c 1279 */ 1280 extern struct workqueue_struct *afs_wq; 1281 extern int afs_net_id; 1282 1283 static inline struct afs_net *afs_net(struct net *net) 1284 { 1285 return net_generic(net, afs_net_id); 1286 } 1287 1288 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1289 { 1290 return afs_net(AFS_FS_S(sb)->net_ns); 1291 } 1292 1293 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1294 { 1295 return afs_sb2net(dentry->d_sb); 1296 } 1297 1298 static inline struct afs_net *afs_i2net(struct inode *inode) 1299 { 1300 return afs_sb2net(inode->i_sb); 1301 } 1302 1303 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1304 { 1305 return afs_i2net(&vnode->netfs.inode); 1306 } 1307 1308 static inline struct afs_net *afs_sock2net(struct sock *sk) 1309 { 1310 return net_generic(sock_net(sk), afs_net_id); 1311 } 1312 1313 static inline void __afs_stat(atomic_t *s) 1314 { 1315 atomic_inc(s); 1316 } 1317 1318 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1319 1320 /* 1321 * misc.c 1322 */ 1323 extern int afs_abort_to_error(u32); 1324 extern void afs_prioritise_error(struct afs_error *, int, u32); 1325 1326 static inline void afs_op_nomem(struct afs_operation *op) 1327 { 1328 op->cumul_error.error = -ENOMEM; 1329 } 1330 1331 static inline int afs_op_error(const struct afs_operation *op) 1332 { 1333 return op->cumul_error.error; 1334 } 1335 1336 static inline s32 afs_op_abort_code(const struct afs_operation *op) 1337 { 1338 return op->cumul_error.abort_code; 1339 } 1340 1341 static inline int afs_op_set_error(struct afs_operation *op, int error) 1342 { 1343 return op->cumul_error.error = error; 1344 } 1345 1346 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code) 1347 { 1348 afs_prioritise_error(&op->cumul_error, error, abort_code); 1349 } 1350 1351 /* 1352 * mntpt.c 1353 */ 1354 extern const struct inode_operations afs_mntpt_inode_operations; 1355 extern const struct inode_operations afs_autocell_inode_operations; 1356 extern const struct file_operations afs_mntpt_file_operations; 1357 1358 extern struct vfsmount *afs_d_automount(struct path *); 1359 extern void afs_mntpt_kill_timer(void); 1360 1361 /* 1362 * proc.c 1363 */ 1364 #ifdef CONFIG_PROC_FS 1365 extern int __net_init afs_proc_init(struct afs_net *); 1366 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1367 extern int afs_proc_cell_setup(struct afs_cell *); 1368 extern void afs_proc_cell_remove(struct afs_cell *); 1369 extern void afs_put_sysnames(struct afs_sysnames *); 1370 #else 1371 static inline int afs_proc_init(struct afs_net *net) { return 0; } 1372 static inline void afs_proc_cleanup(struct afs_net *net) {} 1373 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1374 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1375 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1376 #endif 1377 1378 /* 1379 * rotate.c 1380 */ 1381 void afs_clear_server_states(struct afs_operation *op); 1382 extern bool afs_select_fileserver(struct afs_operation *); 1383 extern void afs_dump_edestaddrreq(const struct afs_operation *); 1384 1385 /* 1386 * rxrpc.c 1387 */ 1388 extern struct workqueue_struct *afs_async_calls; 1389 1390 extern int __net_init afs_open_socket(struct afs_net *); 1391 extern void __net_exit afs_close_socket(struct afs_net *); 1392 extern void afs_charge_preallocation(struct work_struct *); 1393 extern void afs_put_call(struct afs_call *); 1394 void afs_deferred_put_call(struct afs_call *call); 1395 void afs_make_call(struct afs_call *call, gfp_t gfp); 1396 void afs_deliver_to_call(struct afs_call *call); 1397 void afs_wait_for_call_to_complete(struct afs_call *call); 1398 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1399 const struct afs_call_type *, 1400 size_t, size_t); 1401 extern void afs_flat_call_destructor(struct afs_call *); 1402 extern void afs_send_empty_reply(struct afs_call *); 1403 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1404 extern int afs_extract_data(struct afs_call *, bool); 1405 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause); 1406 1407 static inline struct afs_call *afs_get_call(struct afs_call *call, 1408 enum afs_call_trace why) 1409 { 1410 int r; 1411 1412 __refcount_inc(&call->ref, &r); 1413 1414 trace_afs_call(call->debug_id, why, r + 1, 1415 atomic_read(&call->net->nr_outstanding_calls), 1416 __builtin_return_address(0)); 1417 return call; 1418 } 1419 1420 static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why) 1421 { 1422 int r = refcount_read(&call->ref); 1423 1424 trace_afs_call(call->debug_id, why, r, 1425 atomic_read(&call->net->nr_outstanding_calls), 1426 __builtin_return_address(0)); 1427 } 1428 1429 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1430 gfp_t gfp) 1431 { 1432 struct afs_addr_list *alist = op->estate->addresses; 1433 1434 op->call = afs_get_call(call, afs_call_trace_get); 1435 op->type = call->type; 1436 call->op = op; 1437 call->key = op->key; 1438 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1439 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer); 1440 call->service_id = op->server->service_id; 1441 afs_make_call(call, gfp); 1442 afs_put_call(call); 1443 } 1444 1445 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1446 { 1447 call->iov_len = size; 1448 call->kvec[0].iov_base = buf; 1449 call->kvec[0].iov_len = size; 1450 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size); 1451 } 1452 1453 static inline void afs_extract_to_tmp(struct afs_call *call) 1454 { 1455 call->iov_len = sizeof(call->tmp); 1456 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1457 } 1458 1459 static inline void afs_extract_to_tmp64(struct afs_call *call) 1460 { 1461 call->iov_len = sizeof(call->tmp64); 1462 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1463 } 1464 1465 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1466 { 1467 call->iov_len = size; 1468 iov_iter_discard(&call->def_iter, ITER_DEST, size); 1469 } 1470 1471 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1472 { 1473 call->iov_len = size; 1474 afs_extract_begin(call, call->buffer, size); 1475 } 1476 1477 static inline int afs_transfer_reply(struct afs_call *call) 1478 { 1479 return afs_extract_data(call, false); 1480 } 1481 1482 static inline bool afs_check_call_state(struct afs_call *call, 1483 enum afs_call_state state) 1484 { 1485 return READ_ONCE(call->state) == state; 1486 } 1487 1488 static inline bool afs_set_call_state(struct afs_call *call, 1489 enum afs_call_state from, 1490 enum afs_call_state to) 1491 { 1492 bool ok = false; 1493 1494 spin_lock_bh(&call->state_lock); 1495 if (call->state == from) { 1496 call->state = to; 1497 trace_afs_call_state(call, from, to, 0, 0); 1498 ok = true; 1499 } 1500 spin_unlock_bh(&call->state_lock); 1501 return ok; 1502 } 1503 1504 static inline void afs_set_call_complete(struct afs_call *call, 1505 int error, u32 remote_abort) 1506 { 1507 enum afs_call_state state; 1508 bool ok = false; 1509 1510 spin_lock_bh(&call->state_lock); 1511 state = call->state; 1512 if (state != AFS_CALL_COMPLETE) { 1513 call->abort_code = remote_abort; 1514 call->error = error; 1515 call->state = AFS_CALL_COMPLETE; 1516 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1517 error, remote_abort); 1518 ok = true; 1519 } 1520 spin_unlock_bh(&call->state_lock); 1521 if (ok) { 1522 trace_afs_call_done(call); 1523 1524 /* Asynchronous calls have two refs to release - one from the alloc and 1525 * one queued with the work item - and we can't just deallocate the 1526 * call because the work item may be queued again. 1527 */ 1528 if (call->drop_ref) 1529 afs_put_call(call); 1530 } 1531 } 1532 1533 /* 1534 * security.c 1535 */ 1536 extern void afs_put_permits(struct afs_permits *); 1537 extern void afs_clear_permits(struct afs_vnode *); 1538 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1539 struct afs_status_cb *); 1540 extern struct key *afs_request_key(struct afs_cell *); 1541 extern struct key *afs_request_key_rcu(struct afs_cell *); 1542 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1543 extern int afs_permission(struct mnt_idmap *, struct inode *, int); 1544 extern void __exit afs_clean_up_permit_cache(void); 1545 1546 /* 1547 * server.c 1548 */ 1549 extern spinlock_t afs_server_peer_lock; 1550 1551 struct afs_server *afs_find_server(const struct rxrpc_peer *peer); 1552 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1553 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1554 struct afs_server *afs_use_server(struct afs_server *server, bool activate, 1555 enum afs_server_trace reason); 1556 void afs_unuse_server(struct afs_net *net, struct afs_server *server, 1557 enum afs_server_trace reason); 1558 void afs_unuse_server_notime(struct afs_net *net, struct afs_server *server, 1559 enum afs_server_trace reason); 1560 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1561 void afs_purge_servers(struct afs_cell *cell); 1562 extern void afs_fs_probe_timer(struct timer_list *); 1563 void __net_exit afs_wait_for_servers(struct afs_net *net); 1564 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key); 1565 1566 static inline void afs_see_server(struct afs_server *server, enum afs_server_trace trace) 1567 { 1568 int r = refcount_read(&server->ref); 1569 int a = atomic_read(&server->active); 1570 1571 trace_afs_server(server->debug_id, r, a, trace); 1572 1573 } 1574 1575 static inline void afs_inc_servers_outstanding(struct afs_net *net) 1576 { 1577 atomic_inc(&net->servers_outstanding); 1578 } 1579 1580 static inline void afs_dec_servers_outstanding(struct afs_net *net) 1581 { 1582 if (atomic_dec_and_test(&net->servers_outstanding)) 1583 wake_up_var(&net->servers_outstanding); 1584 } 1585 1586 static inline bool afs_is_probing_server(struct afs_server *server) 1587 { 1588 return list_empty(&server->probe_link); 1589 } 1590 1591 /* 1592 * server_list.c 1593 */ 1594 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1595 { 1596 refcount_inc(&slist->usage); 1597 return slist; 1598 } 1599 1600 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1601 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume, 1602 struct key *key, 1603 struct afs_vldb_entry *vldb); 1604 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1605 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist); 1606 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist, 1607 struct afs_server_list *old); 1608 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist); 1609 1610 /* 1611 * super.c 1612 */ 1613 extern int __init afs_fs_init(void); 1614 extern void afs_fs_exit(void); 1615 1616 /* 1617 * symlink.c 1618 */ 1619 extern const struct inode_operations afs_symlink_inode_operations; 1620 extern const struct address_space_operations afs_symlink_aops; 1621 1622 void afs_invalidate_symlink(struct afs_vnode *vnode); 1623 void afs_evict_symlink(struct afs_vnode *vnode); 1624 void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op); 1625 const char *afs_get_link(struct dentry *dentry, struct inode *inode, 1626 struct delayed_call *callback); 1627 int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen); 1628 int afs_symlink_writepages(struct address_space *mapping, 1629 struct writeback_control *wbc); 1630 1631 /* 1632 * validation.c 1633 */ 1634 bool afs_check_validity(const struct afs_vnode *vnode); 1635 int afs_update_volume_state(struct afs_operation *op); 1636 int afs_validate(struct afs_vnode *vnode, struct key *key); 1637 1638 /* 1639 * vlclient.c 1640 */ 1641 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1642 const char *, int); 1643 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1644 struct afs_call *afs_vl_get_capabilities(struct afs_net *net, 1645 struct afs_addr_list *alist, 1646 unsigned int addr_index, 1647 struct key *key, 1648 struct afs_vlserver *server, 1649 unsigned int server_index); 1650 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1651 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1652 1653 /* 1654 * vl_alias.c 1655 */ 1656 extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1657 1658 /* 1659 * vl_probe.c 1660 */ 1661 extern void afs_vlserver_probe_result(struct afs_call *); 1662 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1663 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1664 1665 /* 1666 * vl_rotate.c 1667 */ 1668 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1669 struct afs_cell *, struct key *); 1670 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1671 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1672 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1673 1674 /* 1675 * vlserver_list.c 1676 */ 1677 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1678 { 1679 refcount_inc(&vlserver->ref); 1680 return vlserver; 1681 } 1682 1683 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1684 { 1685 if (vllist) 1686 refcount_inc(&vllist->ref); 1687 return vllist; 1688 } 1689 1690 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1691 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1692 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1693 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1694 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1695 const void *, size_t); 1696 1697 /* 1698 * volume.c 1699 */ 1700 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1701 extern int afs_activate_volume(struct afs_volume *); 1702 extern void afs_deactivate_volume(struct afs_volume *); 1703 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1704 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1705 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1706 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1707 1708 /* 1709 * write.c 1710 */ 1711 void afs_prepare_write(struct netfs_io_subrequest *subreq); 1712 void afs_issue_write(struct netfs_io_subrequest *subreq); 1713 void afs_begin_writeback(struct netfs_io_request *wreq); 1714 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream); 1715 extern int afs_writepages(struct address_space *, struct writeback_control *); 1716 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1717 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1718 extern void afs_prune_wb_keys(struct afs_vnode *); 1719 1720 /* 1721 * xattr.c 1722 */ 1723 extern const struct xattr_handler * const afs_xattr_handlers[]; 1724 1725 /* 1726 * yfsclient.c 1727 */ 1728 extern void yfs_fs_fetch_data(struct afs_operation *); 1729 extern void yfs_fs_create_file(struct afs_operation *); 1730 extern void yfs_fs_make_dir(struct afs_operation *); 1731 extern void yfs_fs_remove_file2(struct afs_operation *); 1732 extern void yfs_fs_remove_file(struct afs_operation *); 1733 extern void yfs_fs_remove_dir(struct afs_operation *); 1734 extern void yfs_fs_link(struct afs_operation *); 1735 extern void yfs_fs_symlink(struct afs_operation *); 1736 extern void yfs_fs_rename(struct afs_operation *); 1737 void yfs_fs_rename_replace(struct afs_operation *op); 1738 void yfs_fs_rename_noreplace(struct afs_operation *op); 1739 void yfs_fs_rename_exchange(struct afs_operation *op); 1740 extern void yfs_fs_store_data(struct afs_operation *); 1741 extern void yfs_fs_setattr(struct afs_operation *); 1742 extern void yfs_fs_get_volume_status(struct afs_operation *); 1743 extern void yfs_fs_set_lock(struct afs_operation *); 1744 extern void yfs_fs_extend_lock(struct afs_operation *); 1745 extern void yfs_fs_release_lock(struct afs_operation *); 1746 extern void yfs_fs_fetch_status(struct afs_operation *); 1747 extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1748 1749 struct yfs_acl { 1750 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1751 struct afs_acl *vol_acl; /* Whole volume ACL */ 1752 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1753 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1754 unsigned int flags; 1755 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1756 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1757 }; 1758 1759 extern void yfs_free_opaque_acl(struct yfs_acl *); 1760 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1761 extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1762 1763 /* 1764 * Miscellaneous inline functions. 1765 */ 1766 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1767 { 1768 return container_of(inode, struct afs_vnode, netfs.inode); 1769 } 1770 1771 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1772 { 1773 return &vnode->netfs.inode; 1774 } 1775 1776 /* 1777 * Note that a dentry got changed. We need to set d_fsdata to the data version 1778 * number derived from the result of the operation. It doesn't matter if 1779 * d_fsdata goes backwards as we'll just revalidate. 1780 */ 1781 static inline void afs_update_dentry_version(struct afs_operation *op, 1782 struct afs_vnode_param *dir_vp, 1783 struct dentry *dentry) 1784 { 1785 if (!op->cumul_error.error) 1786 dentry->d_fsdata = 1787 (void *)(unsigned long)dir_vp->scb.status.data_version; 1788 } 1789 1790 /* 1791 * Check for a conflicting operation on a directory that we just unlinked from. 1792 * If someone managed to sneak a link or an unlink in on the file we just 1793 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS). 1794 */ 1795 static inline void afs_check_dir_conflict(struct afs_operation *op, 1796 struct afs_vnode_param *dvp) 1797 { 1798 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version) 1799 op->flags |= AFS_OPERATION_DIR_CONFLICT; 1800 } 1801 1802 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1803 { 1804 trace_afs_io_error(call->debug_id, -EIO, where); 1805 return -EIO; 1806 } 1807 1808 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1809 { 1810 trace_afs_file_error(vnode, -EIO, where); 1811 return -EIO; 1812 } 1813 1814 /* 1815 * Set the callback promise on a vnode. 1816 */ 1817 static inline void afs_set_cb_promise(struct afs_vnode *vnode, time64_t expires_at, 1818 enum afs_cb_promise_trace trace) 1819 { 1820 atomic64_set(&vnode->cb_expires_at, expires_at); 1821 trace_afs_cb_promise(vnode, trace); 1822 } 1823 1824 /* 1825 * Clear the callback promise on a vnode, returning true if it was promised. 1826 */ 1827 static inline bool afs_clear_cb_promise(struct afs_vnode *vnode, 1828 enum afs_cb_promise_trace trace) 1829 { 1830 trace_afs_cb_promise(vnode, trace); 1831 return atomic64_xchg(&vnode->cb_expires_at, AFS_NO_CB_PROMISE) != AFS_NO_CB_PROMISE; 1832 } 1833 1834 /* 1835 * Mark a directory as being invalid. 1836 */ 1837 static inline void afs_invalidate_dir(struct afs_vnode *dvnode, 1838 enum afs_dir_invalid_trace trace) 1839 { 1840 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1841 trace_afs_dir_invalid(dvnode, trace); 1842 afs_stat_v(dvnode, n_inval); 1843 } 1844 } 1845 1846 /*****************************************************************************/ 1847 /* 1848 * debug tracing 1849 */ 1850 extern unsigned afs_debug; 1851 1852 #define dbgprintk(FMT,...) \ 1853 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1854 1855 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1856 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1857 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1858 1859 1860 #if defined(__KDEBUG) 1861 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1862 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1863 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1864 1865 #elif defined(CONFIG_AFS_DEBUG) 1866 #define AFS_DEBUG_KENTER 0x01 1867 #define AFS_DEBUG_KLEAVE 0x02 1868 #define AFS_DEBUG_KDEBUG 0x04 1869 1870 #define _enter(FMT,...) \ 1871 do { \ 1872 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1873 kenter(FMT,##__VA_ARGS__); \ 1874 } while (0) 1875 1876 #define _leave(FMT,...) \ 1877 do { \ 1878 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1879 kleave(FMT,##__VA_ARGS__); \ 1880 } while (0) 1881 1882 #define _debug(FMT,...) \ 1883 do { \ 1884 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1885 kdebug(FMT,##__VA_ARGS__); \ 1886 } while (0) 1887 1888 #else 1889 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1890 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1891 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1892 #endif 1893 1894 /* 1895 * debug assertion checking 1896 */ 1897 #if 1 // defined(__KDEBUGALL) 1898 1899 #define ASSERT(X) \ 1900 do { \ 1901 if (unlikely(!(X))) { \ 1902 printk(KERN_ERR "\n"); \ 1903 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1904 BUG(); \ 1905 } \ 1906 } while(0) 1907 1908 #define ASSERTCMP(X, OP, Y) \ 1909 do { \ 1910 if (unlikely(!((X) OP (Y)))) { \ 1911 printk(KERN_ERR "\n"); \ 1912 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1913 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1914 (unsigned long)(X), (unsigned long)(Y)); \ 1915 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1916 (unsigned long)(X), (unsigned long)(Y)); \ 1917 BUG(); \ 1918 } \ 1919 } while(0) 1920 1921 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1922 do { \ 1923 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1924 printk(KERN_ERR "\n"); \ 1925 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1926 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1927 (unsigned long)(L), (unsigned long)(N), \ 1928 (unsigned long)(H)); \ 1929 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1930 (unsigned long)(L), (unsigned long)(N), \ 1931 (unsigned long)(H)); \ 1932 BUG(); \ 1933 } \ 1934 } while(0) 1935 1936 #define ASSERTIF(C, X) \ 1937 do { \ 1938 if (unlikely((C) && !(X))) { \ 1939 printk(KERN_ERR "\n"); \ 1940 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1941 BUG(); \ 1942 } \ 1943 } while(0) 1944 1945 #define ASSERTIFCMP(C, X, OP, Y) \ 1946 do { \ 1947 if (unlikely((C) && !((X) OP (Y)))) { \ 1948 printk(KERN_ERR "\n"); \ 1949 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1950 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1951 (unsigned long)(X), (unsigned long)(Y)); \ 1952 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1953 (unsigned long)(X), (unsigned long)(Y)); \ 1954 BUG(); \ 1955 } \ 1956 } while(0) 1957 1958 #else 1959 1960 #define ASSERT(X) \ 1961 do { \ 1962 } while(0) 1963 1964 #define ASSERTCMP(X, OP, Y) \ 1965 do { \ 1966 } while(0) 1967 1968 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1969 do { \ 1970 } while(0) 1971 1972 #define ASSERTIF(C, X) \ 1973 do { \ 1974 } while(0) 1975 1976 #define ASSERTIFCMP(C, X, OP, Y) \ 1977 do { \ 1978 } while(0) 1979 1980 #endif /* __KDEBUGALL */ 1981