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