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 <net/net_namespace.h> 24 #include <net/netns/generic.h> 25 #include <net/sock.h> 26 #include <net/af_rxrpc.h> 27 28 #include "afs.h" 29 #include "afs_vl.h" 30 31 #define AFS_CELL_MAX_ADDRS 15 32 33 struct pagevec; 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 rxrpc_call *rxcall; /* RxRPC call handle */ 134 struct rxrpc_peer *peer; /* Remote endpoint */ 135 struct key *key; /* security for this call */ 136 struct afs_net *net; /* The network namespace */ 137 struct afs_server *server; /* The fileserver record if fs op (pins ref) */ 138 struct afs_vlserver *vlserver; /* The vlserver record if vl op */ 139 void *request; /* request data (first part) */ 140 size_t iov_len; /* Size of *iter to be used */ 141 struct iov_iter def_iter; /* Default buffer/data iterator */ 142 struct iov_iter *write_iter; /* Iterator defining write to be made */ 143 struct iov_iter *iter; /* Iterator currently in use */ 144 union { /* Convenience for ->def_iter */ 145 struct kvec kvec[1]; 146 struct bio_vec bvec[1]; 147 }; 148 void *buffer; /* reply receive buffer */ 149 union { 150 struct afs_endpoint_state *probe; 151 struct afs_addr_list *vl_probe; 152 struct afs_addr_list *ret_alist; 153 struct afs_vldb_entry *ret_vldb; 154 char *ret_str; 155 }; 156 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */ 157 unsigned char probe_index; /* Address in ->probe_alist */ 158 struct afs_operation *op; 159 unsigned int server_index; 160 refcount_t ref; 161 enum afs_call_state state; 162 spinlock_t state_lock; 163 int error; /* error code */ 164 u32 abort_code; /* Remote abort ID or 0 */ 165 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */ 166 unsigned request_size; /* size of request data */ 167 unsigned reply_max; /* maximum size of reply */ 168 unsigned count2; /* count used in unmarshalling */ 169 unsigned char unmarshall; /* unmarshalling phase */ 170 bool drop_ref; /* T if need to drop ref for incoming call */ 171 bool need_attention; /* T if RxRPC poked us */ 172 bool async; /* T if asynchronous */ 173 bool upgrade; /* T to request service upgrade */ 174 bool intr; /* T if interruptible */ 175 bool unmarshalling_error; /* T if an unmarshalling error occurred */ 176 bool responded; /* Got a response from the call (may be abort) */ 177 u16 service_id; /* Actual service ID (after upgrade) */ 178 unsigned int debug_id; /* Trace ID */ 179 u32 operation_ID; /* operation ID for an incoming call */ 180 u32 count; /* count for use in unmarshalling */ 181 union { /* place to extract temporary data */ 182 struct { 183 __be32 tmp_u; 184 __be32 tmp; 185 } __attribute__((packed)); 186 __be64 tmp64; 187 }; 188 ktime_t issue_time; /* Time of issue of operation */ 189 }; 190 191 struct afs_call_type { 192 const char *name; 193 unsigned int op; /* Really enum afs_fs_operation */ 194 195 /* deliver request or reply data to an call 196 * - returning an error will cause the call to be aborted 197 */ 198 int (*deliver)(struct afs_call *call); 199 200 /* clean up a call */ 201 void (*destructor)(struct afs_call *call); 202 203 /* Work function */ 204 void (*work)(struct work_struct *work); 205 206 /* Call done function (gets called immediately on success or failure) */ 207 void (*done)(struct afs_call *call); 208 }; 209 210 /* 211 * Key available for writeback on a file. 212 */ 213 struct afs_wb_key { 214 refcount_t usage; 215 struct key *key; 216 struct list_head vnode_link; /* Link in vnode->wb_keys */ 217 }; 218 219 /* 220 * AFS open file information record. Pointed to by file->private_data. 221 */ 222 struct afs_file { 223 struct key *key; /* The key this file was opened with */ 224 struct afs_wb_key *wb; /* Writeback key record for this file */ 225 }; 226 227 static inline struct key *afs_file_key(struct file *file) 228 { 229 struct afs_file *af = file->private_data; 230 231 return af->key; 232 } 233 234 /* 235 * Record of an outstanding read operation on a vnode. 236 */ 237 struct afs_read { 238 loff_t pos; /* Where to start reading */ 239 loff_t len; /* How much we're asking for */ 240 loff_t actual_len; /* How much we're actually getting */ 241 loff_t file_size; /* File size returned by server */ 242 struct key *key; /* The key to use to reissue the read */ 243 struct afs_vnode *vnode; /* The file being read into. */ 244 struct netfs_io_subrequest *subreq; /* Fscache helper read request this belongs to */ 245 afs_dataversion_t data_version; /* Version number returned by server */ 246 refcount_t usage; 247 unsigned int call_debug_id; 248 unsigned int nr_pages; 249 int error; 250 void (*done)(struct afs_read *); 251 void (*cleanup)(struct afs_read *); 252 struct iov_iter *iter; /* Iterator representing the buffer */ 253 struct iov_iter def_iter; /* Default iterator */ 254 }; 255 256 /* 257 * AFS superblock private data 258 * - there's one superblock per volume 259 */ 260 struct afs_super_info { 261 struct net *net_ns; /* Network namespace */ 262 struct afs_cell *cell; /* The cell in which the volume resides */ 263 struct afs_volume *volume; /* volume record */ 264 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 265 bool dyn_root; /* True if dynamic root */ 266 }; 267 268 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 269 { 270 return sb->s_fs_info; 271 } 272 273 extern struct file_system_type afs_fs_type; 274 275 /* 276 * Set of substitutes for @sys. 277 */ 278 struct afs_sysnames { 279 #define AFS_NR_SYSNAME 16 280 char *subs[AFS_NR_SYSNAME]; 281 refcount_t usage; 282 unsigned short nr; 283 char blank[1]; 284 }; 285 286 /* 287 * AFS network namespace record. 288 */ 289 struct afs_net { 290 struct net *net; /* Backpointer to the owning net namespace */ 291 struct afs_uuid uuid; 292 bool live; /* F if this namespace is being removed */ 293 294 /* AF_RXRPC I/O stuff */ 295 struct socket *socket; 296 struct afs_call *spare_incoming_call; 297 struct work_struct charge_preallocation_work; 298 struct mutex socket_mutex; 299 atomic_t nr_outstanding_calls; 300 atomic_t nr_superblocks; 301 302 /* Cell database */ 303 struct rb_root cells; 304 struct afs_cell *ws_cell; 305 struct work_struct cells_manager; 306 struct timer_list cells_timer; 307 atomic_t cells_outstanding; 308 struct rw_semaphore cells_lock; 309 struct mutex cells_alias_lock; 310 311 struct mutex proc_cells_lock; 312 struct hlist_head proc_cells; 313 314 /* Known servers. Theoretically each fileserver can only be in one 315 * cell, but in practice, people create aliases and subsets and there's 316 * no easy way to distinguish them. 317 */ 318 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */ 319 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 320 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */ 321 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */ 322 struct hlist_head fs_proc; /* procfs servers list */ 323 324 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */ 325 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */ 326 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 327 328 struct work_struct fs_manager; 329 struct timer_list fs_timer; 330 331 struct work_struct fs_prober; 332 struct timer_list fs_probe_timer; 333 atomic_t servers_outstanding; 334 335 /* File locking renewal management */ 336 struct mutex lock_manager_mutex; 337 338 /* Misc */ 339 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 340 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 341 struct afs_sysnames *sysnames; 342 rwlock_t sysnames_lock; 343 struct afs_addr_preference_list __rcu *address_prefs; 344 u16 address_pref_version; 345 346 /* Statistics counters */ 347 atomic_t n_lookup; /* Number of lookups done */ 348 atomic_t n_reval; /* Number of dentries needing revalidation */ 349 atomic_t n_inval; /* Number of invalidations by the server */ 350 atomic_t n_relpg; /* Number of invalidations by release_folio */ 351 atomic_t n_read_dir; /* Number of directory pages read */ 352 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 353 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 354 atomic_t n_stores; /* Number of store ops */ 355 atomic_long_t n_store_bytes; /* Number of bytes stored */ 356 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 357 atomic_t n_fetches; /* Number of data fetch ops */ 358 }; 359 360 extern const char afs_init_sysname[]; 361 362 enum afs_cell_state { 363 AFS_CELL_UNSET, 364 AFS_CELL_ACTIVATING, 365 AFS_CELL_ACTIVE, 366 AFS_CELL_DEACTIVATING, 367 AFS_CELL_INACTIVE, 368 AFS_CELL_FAILED, 369 AFS_CELL_REMOVED, 370 }; 371 372 /* 373 * AFS cell record. 374 * 375 * This is a tricky concept to get right as it is possible to create aliases 376 * simply by pointing AFSDB/SRV records for two names at the same set of VL 377 * servers; it is also possible to do things like setting up two sets of VL 378 * servers, one of which provides a superset of the volumes provided by the 379 * other (for internal/external division, for example). 380 * 381 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 382 * servers and (b) a cell's name is used by the client to select the key to use 383 * for authentication and encryption. The cell name is not typically used in 384 * the protocol. 385 * 386 * Two cells are determined to be aliases if they have an explicit alias (YFS 387 * only), share any VL servers in common or have at least one volume in common. 388 * "In common" means that the address list of the VL servers or the fileservers 389 * share at least one endpoint. 390 */ 391 struct afs_cell { 392 union { 393 struct rcu_head rcu; 394 struct rb_node net_node; /* Node in net->cells */ 395 }; 396 struct afs_net *net; 397 struct afs_cell *alias_of; /* The cell this is an alias of */ 398 struct afs_volume *root_volume; /* The root.cell volume if there is one */ 399 struct key *anonymous_key; /* anonymous user key for this cell */ 400 struct work_struct manager; /* Manager for init/deinit/dns */ 401 struct hlist_node proc_link; /* /proc cell list link */ 402 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 403 time64_t last_inactive; /* Time of last drop of usage count */ 404 refcount_t ref; /* Struct refcount */ 405 atomic_t active; /* Active usage counter */ 406 unsigned long flags; 407 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 408 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 409 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */ 410 enum afs_cell_state state; 411 short error; 412 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 413 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 414 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 415 unsigned int debug_id; 416 417 /* The volumes belonging to this cell */ 418 struct rw_semaphore vs_lock; /* Lock for server->volumes */ 419 struct rb_root volumes; /* Tree of volumes on this server */ 420 struct hlist_head proc_volumes; /* procfs volume list */ 421 seqlock_t volume_lock; /* For volumes */ 422 423 /* Active fileserver interaction state. */ 424 struct rb_root fs_servers; /* afs_server (by server UUID) */ 425 seqlock_t fs_lock; /* For fs_servers */ 426 427 /* VL server list. */ 428 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 429 struct afs_vlserver_list __rcu *vl_servers; 430 431 u8 name_len; /* Length of name */ 432 char *name; /* Cell name, case-flattened and NUL-padded */ 433 }; 434 435 /* 436 * Volume Location server record. 437 */ 438 struct afs_vlserver { 439 struct rcu_head rcu; 440 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 441 unsigned long flags; 442 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 443 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 444 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 445 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */ 446 rwlock_t lock; /* Lock on addresses */ 447 refcount_t ref; 448 unsigned int rtt; /* Server's current RTT in uS */ 449 unsigned int debug_id; 450 451 /* Probe state */ 452 wait_queue_head_t probe_wq; 453 atomic_t probe_outstanding; 454 spinlock_t probe_lock; 455 struct { 456 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */ 457 u32 abort_code; 458 short error; 459 unsigned short flags; 460 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */ 461 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */ 462 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */ 463 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */ 464 } probe; 465 466 u16 service_id; /* Service ID we're using */ 467 u16 port; 468 u16 name_len; /* Length of name */ 469 char name[]; /* Server name, case-flattened */ 470 }; 471 472 /* 473 * Weighted list of Volume Location servers. 474 */ 475 struct afs_vlserver_entry { 476 u16 priority; /* Preference (as SRV) */ 477 u16 weight; /* Weight (as SRV) */ 478 enum dns_record_source source:8; 479 enum dns_lookup_status status:8; 480 struct afs_vlserver *server; 481 }; 482 483 struct afs_vlserver_list { 484 struct rcu_head rcu; 485 refcount_t ref; 486 u8 nr_servers; 487 u8 index; /* Server currently in use */ 488 u8 preferred; /* Preferred server */ 489 enum dns_record_source source:8; 490 enum dns_lookup_status status:8; 491 rwlock_t lock; 492 struct afs_vlserver_entry servers[]; 493 }; 494 495 /* 496 * Cached VLDB entry. 497 * 498 * This is pointed to by cell->vldb_entries, indexed by name. 499 */ 500 struct afs_vldb_entry { 501 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 502 503 unsigned long flags; 504 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 505 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 506 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 507 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 508 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 509 510 uuid_t fs_server[AFS_NMAXNSERVERS]; 511 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */ 512 u8 fs_mask[AFS_NMAXNSERVERS]; 513 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 514 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 515 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 516 u8 vlsf_flags[AFS_NMAXNSERVERS]; 517 short error; 518 u8 nr_servers; /* Number of server records */ 519 u8 name_len; 520 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 521 }; 522 523 /* 524 * Fileserver endpoint state. The records the addresses of a fileserver's 525 * endpoints and the state and result of a round of probing on them. This 526 * allows the rotation algorithm to access those results without them being 527 * erased by a subsequent round of probing. 528 */ 529 struct afs_endpoint_state { 530 struct rcu_head rcu; 531 struct afs_addr_list *addresses; /* The addresses being probed */ 532 unsigned long responsive_set; /* Bitset of responsive endpoints */ 533 unsigned long failed_set; /* Bitset of endpoints we failed to probe */ 534 refcount_t ref; 535 unsigned int server_id; /* Debug ID of server */ 536 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */ 537 atomic_t nr_probing; /* Number of outstanding probes */ 538 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */ 539 s32 abort_code; 540 short error; 541 unsigned long flags; 542 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */ 543 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */ 544 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */ 545 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */ 546 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */ 547 }; 548 549 /* 550 * Record of fileserver with which we're actively communicating. 551 */ 552 struct afs_server { 553 struct rcu_head rcu; 554 union { 555 uuid_t uuid; /* Server ID */ 556 struct afs_uuid _uuid; 557 }; 558 559 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 560 struct rb_node uuid_rb; /* Link in net->fs_servers */ 561 struct afs_server __rcu *uuid_next; /* Next server with same UUID */ 562 struct afs_server *uuid_prev; /* Previous server with same UUID */ 563 struct list_head probe_link; /* Link in net->fs_probe_list */ 564 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */ 565 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */ 566 struct hlist_node proc_link; /* Link in net->fs_proc */ 567 struct list_head volumes; /* RCU list of afs_server_entry objects */ 568 struct afs_server *gc_next; /* Next server in manager's list */ 569 time64_t unuse_time; /* Time at which last unused */ 570 unsigned long flags; 571 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 572 #define AFS_SERVER_FL_UPDATING 1 573 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 574 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */ 575 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */ 576 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */ 577 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 578 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 579 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 580 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 581 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */ 582 refcount_t ref; /* Object refcount */ 583 atomic_t active; /* Active user count */ 584 u32 addr_version; /* Address list version */ 585 u16 service_id; /* Service ID we're using. */ 586 unsigned int rtt; /* Server's current RTT in uS */ 587 unsigned int debug_id; /* Debugging ID for traces */ 588 589 /* file service access */ 590 rwlock_t fs_lock; /* access lock */ 591 592 /* Probe state */ 593 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */ 594 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 595 wait_queue_head_t probe_wq; 596 unsigned int probe_counter; /* Number of probes issued */ 597 spinlock_t probe_lock; 598 }; 599 600 enum afs_ro_replicating { 601 AFS_RO_NOT_REPLICATING, /* Not doing replication */ 602 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */ 603 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */ 604 } __mode(byte); 605 606 /* 607 * Replaceable volume server list. 608 */ 609 struct afs_server_entry { 610 struct afs_server *server; 611 struct afs_volume *volume; 612 struct list_head slink; /* Link in server->volumes */ 613 time64_t cb_expires_at; /* Time at which volume-level callback expires */ 614 unsigned long flags; 615 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */ 616 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */ 617 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */ 618 }; 619 620 struct afs_server_list { 621 struct rcu_head rcu; 622 refcount_t usage; 623 bool attached; /* T if attached to servers */ 624 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */ 625 unsigned char nr_servers; 626 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 627 unsigned int seq; /* Set to ->servers_seq when installed */ 628 rwlock_t lock; 629 struct afs_server_entry servers[]; 630 }; 631 632 /* 633 * Live AFS volume management. 634 */ 635 struct afs_volume { 636 struct rcu_head rcu; 637 afs_volid_t vid; /* The volume ID of this volume */ 638 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */ 639 refcount_t ref; 640 time64_t update_at; /* Time at which to next update */ 641 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 642 struct rb_node cell_node; /* Link in cell->volumes */ 643 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 644 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 645 struct work_struct destructor; /* Deferred destructor */ 646 unsigned long flags; 647 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 648 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 649 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 650 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 651 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */ 652 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */ 653 #ifdef CONFIG_AFS_FSCACHE 654 struct fscache_volume *cache; /* Caching cookie */ 655 #endif 656 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 657 rwlock_t servers_lock; /* Lock for ->servers */ 658 unsigned int servers_seq; /* Incremented each time ->servers changes */ 659 660 /* RO release tracking */ 661 struct mutex volsync_lock; /* Time/state evaluation lock */ 662 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */ 663 time64_t update_time; /* Volume update time (or TIME64_MIN) */ 664 665 /* Callback management */ 666 struct mutex cb_check_lock; /* Lock to control race to check after v_break */ 667 time64_t cb_expires_at; /* Earliest volume callback expiry time */ 668 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */ 669 atomic_t cb_v_break; /* Volume-break event counter. */ 670 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */ 671 atomic_t cb_scrub; /* Scrub-all-data event counter. */ 672 rwlock_t cb_v_break_lock; 673 struct rw_semaphore open_mmaps_lock; 674 struct list_head open_mmaps; /* List of vnodes that are mmapped */ 675 676 afs_voltype_t type; /* type of volume */ 677 char type_force; /* force volume type (suppress R/O -> R/W) */ 678 u8 name_len; 679 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 680 }; 681 682 enum afs_lock_state { 683 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 684 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 685 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 686 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 687 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 688 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 689 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 690 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 691 }; 692 693 /* 694 * AFS inode private data. 695 * 696 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 697 * leak from one inode to another. 698 */ 699 struct afs_vnode { 700 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 701 struct afs_volume *volume; /* volume on which vnode resides */ 702 struct afs_fid fid; /* the file identifier for this inode */ 703 struct afs_file_status status; /* AFS status info for this file */ 704 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 705 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 706 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 707 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 708 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 709 struct key *silly_key; /* Silly rename key */ 710 spinlock_t wb_lock; /* lock for wb_keys */ 711 spinlock_t lock; /* waitqueue/flags lock */ 712 unsigned long flags; 713 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 714 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 715 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 716 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 717 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 718 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 719 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 720 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 721 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */ 722 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */ 723 724 struct list_head wb_keys; /* List of keys available for writeback */ 725 struct list_head pending_locks; /* locks waiting to be granted */ 726 struct list_head granted_locks; /* locks granted on this file */ 727 struct delayed_work lock_work; /* work to be done in locking */ 728 struct key *lock_key; /* Key to be used in lock ops */ 729 ktime_t locked_at; /* Time at which lock obtained */ 730 enum afs_lock_state lock_state : 8; 731 afs_lock_type_t lock_type : 8; 732 733 /* outstanding callback notification on this file */ 734 struct work_struct cb_work; /* Work for mmap'd files */ 735 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */ 736 void *cb_server; /* Server with callback/filelock */ 737 atomic_t cb_nr_mmap; /* Number of mmaps */ 738 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */ 739 unsigned int cb_scrub; /* Scrub counter on ->volume */ 740 unsigned int cb_break; /* Break counter on vnode */ 741 unsigned int cb_v_check; /* Break check counter on ->volume */ 742 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 743 744 atomic64_t cb_expires_at; /* time at which callback expires */ 745 #define AFS_NO_CB_PROMISE TIME64_MIN 746 }; 747 748 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 749 { 750 #ifdef CONFIG_AFS_FSCACHE 751 return netfs_i_cookie(&vnode->netfs); 752 #else 753 return NULL; 754 #endif 755 } 756 757 static inline void afs_vnode_set_cache(struct afs_vnode *vnode, 758 struct fscache_cookie *cookie) 759 { 760 #ifdef CONFIG_AFS_FSCACHE 761 vnode->netfs.cache = cookie; 762 if (cookie) 763 mapping_set_release_always(vnode->netfs.inode.i_mapping); 764 #endif 765 } 766 767 /* 768 * cached security record for one user's attempt to access a vnode 769 */ 770 struct afs_permit { 771 struct key *key; /* RxRPC ticket holding a security context */ 772 afs_access_t access; /* CallerAccess value for this key */ 773 }; 774 775 /* 776 * Immutable cache of CallerAccess records from attempts to access vnodes. 777 * These may be shared between multiple vnodes. 778 */ 779 struct afs_permits { 780 struct rcu_head rcu; 781 struct hlist_node hash_node; /* Link in hash */ 782 unsigned long h; /* Hash value for this permit list */ 783 refcount_t usage; 784 unsigned short nr_permits; /* Number of records */ 785 bool invalidated; /* Invalidated due to key change */ 786 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */ 787 }; 788 789 /* 790 * Error prioritisation and accumulation. 791 */ 792 struct afs_error { 793 s32 abort_code; /* Cumulative abort code */ 794 short error; /* Cumulative error */ 795 bool responded; /* T if server responded */ 796 bool aborted; /* T if ->error is from an abort */ 797 }; 798 799 /* 800 * Cursor for iterating over a set of volume location servers. 801 */ 802 struct afs_vl_cursor { 803 struct afs_cell *cell; /* The cell we're querying */ 804 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 805 struct afs_vlserver *server; /* Server on which this resides */ 806 struct afs_addr_list *alist; /* Current address list (pins ref) */ 807 struct key *key; /* Key for the server */ 808 unsigned long untried_servers; /* Bitmask of untried servers */ 809 unsigned long addr_tried; /* Tried addresses */ 810 struct afs_error cumul_error; /* Cumulative error */ 811 unsigned int debug_id; 812 s32 call_abort_code; 813 short call_error; /* Error from single call */ 814 short server_index; /* Current server */ 815 signed char addr_index; /* Current address */ 816 unsigned short flags; 817 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 818 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 819 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 820 short nr_iterations; /* Number of server iterations */ 821 bool call_responded; /* T if the current address responded */ 822 }; 823 824 /* 825 * Fileserver state tracking for an operation. An array of these is kept, 826 * indexed by server index. 827 */ 828 struct afs_server_state { 829 /* Tracking of fileserver probe state. Other operations may interfere 830 * by probing a fileserver when accessing other volumes. 831 */ 832 unsigned int probe_seq; 833 unsigned long untried_addrs; /* Addresses we haven't tried yet */ 834 struct wait_queue_entry probe_waiter; 835 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */ 836 }; 837 838 /* 839 * Fileserver operation methods. 840 */ 841 struct afs_operation_ops { 842 void (*issue_afs_rpc)(struct afs_operation *op); 843 void (*issue_yfs_rpc)(struct afs_operation *op); 844 void (*success)(struct afs_operation *op); 845 void (*aborted)(struct afs_operation *op); 846 void (*failed)(struct afs_operation *op); 847 void (*edit_dir)(struct afs_operation *op); 848 void (*put)(struct afs_operation *op); 849 }; 850 851 struct afs_vnode_param { 852 struct afs_vnode *vnode; 853 struct afs_fid fid; /* Fid to access */ 854 struct afs_status_cb scb; /* Returned status and callback promise */ 855 afs_dataversion_t dv_before; /* Data version before the call */ 856 unsigned int cb_break_before; /* cb_break before the call */ 857 u8 dv_delta; /* Expected change in data version */ 858 bool put_vnode:1; /* T if we have a ref on the vnode */ 859 bool need_io_lock:1; /* T if we need the I/O lock on this */ 860 bool update_ctime:1; /* Need to update the ctime */ 861 bool set_size:1; /* Must update i_size */ 862 bool op_unlinked:1; /* True if file was unlinked by op */ 863 bool speculative:1; /* T if speculative status fetch (no vnode lock) */ 864 bool modification:1; /* Set if the content gets modified */ 865 }; 866 867 /* 868 * Fileserver operation wrapper, handling server and address rotation 869 * asynchronously. May make simultaneous calls to multiple servers. 870 */ 871 struct afs_operation { 872 struct afs_net *net; /* Network namespace */ 873 struct key *key; /* Key for the cell */ 874 const struct afs_call_type *type; /* Type of call done */ 875 const struct afs_operation_ops *ops; 876 877 /* Parameters/results for the operation */ 878 struct afs_volume *volume; /* Volume being accessed */ 879 struct afs_vnode_param file[2]; 880 struct afs_vnode_param *more_files; 881 struct afs_volsync pre_volsync; /* Volsync before op */ 882 struct afs_volsync volsync; /* Volsync returned by op */ 883 struct dentry *dentry; /* Dentry to be altered */ 884 struct dentry *dentry_2; /* Second dentry to be altered */ 885 struct timespec64 mtime; /* Modification time to record */ 886 struct timespec64 ctime; /* Change time to set */ 887 struct afs_error cumul_error; /* Cumulative error */ 888 short nr_files; /* Number of entries in file[], more_files */ 889 unsigned int debug_id; 890 891 unsigned int cb_v_break; /* Volume break counter before op */ 892 893 union { 894 struct { 895 int which; /* Which ->file[] to fetch for */ 896 } fetch_status; 897 struct { 898 int reason; /* enum afs_edit_dir_reason */ 899 mode_t mode; 900 const char *symlink; 901 } create; 902 struct { 903 bool need_rehash; 904 } unlink; 905 struct { 906 struct dentry *rehash; 907 struct dentry *tmp; 908 bool new_negative; 909 } rename; 910 struct { 911 struct afs_read *req; 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 bool laundering; /* Laundering page, PG_writeback not set */ 922 } store; 923 struct { 924 struct iattr *attr; 925 loff_t old_i_size; 926 } setattr; 927 struct afs_acl *acl; 928 struct yfs_acl *yacl; 929 struct { 930 struct afs_volume_status vs; 931 struct kstatfs *buf; 932 } volstatus; 933 }; 934 935 /* Fileserver iteration state */ 936 struct afs_server_list *server_list; /* Current server list (pins ref) */ 937 struct afs_server *server; /* Server we're using (ref pinned by server_list) */ 938 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */ 939 struct afs_server_state *server_states; /* States of the servers involved */ 940 struct afs_call *call; 941 unsigned long untried_servers; /* Bitmask of untried servers */ 942 unsigned long addr_tried; /* Tried addresses */ 943 s32 call_abort_code; /* Abort code from single call */ 944 short call_error; /* Error from single call */ 945 short server_index; /* Current server */ 946 short nr_iterations; /* Number of server iterations */ 947 signed char addr_index; /* Current address */ 948 bool call_responded; /* T if the current address responded */ 949 950 unsigned int flags; 951 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */ 952 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */ 953 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */ 954 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */ 955 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 956 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 957 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */ 958 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */ 959 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */ 960 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */ 961 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */ 962 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */ 963 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */ 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 * We use folio->private to hold the amount of the folio that we've written to, 990 * splitting the field into two parts. However, we need to represent a range 991 * 0...FOLIO_SIZE, so we reduce the resolution if the size of the folio 992 * exceeds what we can encode. 993 */ 994 #ifdef CONFIG_64BIT 995 #define __AFS_FOLIO_PRIV_MASK 0x7fffffffUL 996 #define __AFS_FOLIO_PRIV_SHIFT 32 997 #define __AFS_FOLIO_PRIV_MMAPPED 0x80000000UL 998 #else 999 #define __AFS_FOLIO_PRIV_MASK 0x7fffUL 1000 #define __AFS_FOLIO_PRIV_SHIFT 16 1001 #define __AFS_FOLIO_PRIV_MMAPPED 0x8000UL 1002 #endif 1003 1004 static inline unsigned int afs_folio_dirty_resolution(struct folio *folio) 1005 { 1006 int shift = folio_shift(folio) - (__AFS_FOLIO_PRIV_SHIFT - 1); 1007 return (shift > 0) ? shift : 0; 1008 } 1009 1010 static inline size_t afs_folio_dirty_from(struct folio *folio, unsigned long priv) 1011 { 1012 unsigned long x = priv & __AFS_FOLIO_PRIV_MASK; 1013 1014 /* The lower bound is inclusive */ 1015 return x << afs_folio_dirty_resolution(folio); 1016 } 1017 1018 static inline size_t afs_folio_dirty_to(struct folio *folio, unsigned long priv) 1019 { 1020 unsigned long x = (priv >> __AFS_FOLIO_PRIV_SHIFT) & __AFS_FOLIO_PRIV_MASK; 1021 1022 /* The upper bound is immediately beyond the region */ 1023 return (x + 1) << afs_folio_dirty_resolution(folio); 1024 } 1025 1026 static inline unsigned long afs_folio_dirty(struct folio *folio, size_t from, size_t to) 1027 { 1028 unsigned int res = afs_folio_dirty_resolution(folio); 1029 from >>= res; 1030 to = (to - 1) >> res; 1031 return (to << __AFS_FOLIO_PRIV_SHIFT) | from; 1032 } 1033 1034 static inline unsigned long afs_folio_dirty_mmapped(unsigned long priv) 1035 { 1036 return priv | __AFS_FOLIO_PRIV_MMAPPED; 1037 } 1038 1039 static inline bool afs_is_folio_dirty_mmapped(unsigned long priv) 1040 { 1041 return priv & __AFS_FOLIO_PRIV_MMAPPED; 1042 } 1043 1044 #include <trace/events/afs.h> 1045 1046 /*****************************************************************************/ 1047 /* 1048 * addr_list.c 1049 */ 1050 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 1051 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr); 1052 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 1053 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 1054 const char *, size_t, char, 1055 unsigned short, unsigned short); 1056 bool afs_addr_list_same(const struct afs_addr_list *a, 1057 const struct afs_addr_list *b); 1058 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 1059 1060 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr, 1061 __be32 xdr, u16 port); 1062 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr, 1063 __be32 *xdr, u16 port); 1064 1065 /* 1066 * addr_prefs.c 1067 */ 1068 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size); 1069 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist); 1070 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist); 1071 1072 /* 1073 * callback.c 1074 */ 1075 extern void afs_invalidate_mmap_work(struct work_struct *); 1076 extern void afs_init_callback_state(struct afs_server *); 1077 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1078 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1079 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 1080 1081 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 1082 { 1083 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub; 1084 } 1085 1086 static inline bool afs_cb_is_broken(unsigned int cb_break, 1087 const struct afs_vnode *vnode) 1088 { 1089 return cb_break != (vnode->cb_break + 1090 atomic_read(&vnode->volume->cb_ro_snapshot) + 1091 atomic_read(&vnode->volume->cb_scrub)); 1092 } 1093 1094 /* 1095 * cell.c 1096 */ 1097 extern int afs_cell_init(struct afs_net *, const char *); 1098 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned, 1099 enum afs_cell_trace); 1100 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 1101 const char *, bool); 1102 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace); 1103 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace); 1104 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace); 1105 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace); 1106 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace); 1107 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace); 1108 extern void afs_manage_cells(struct work_struct *); 1109 extern void afs_cells_timer(struct timer_list *); 1110 extern void __net_exit afs_cell_purge(struct afs_net *); 1111 1112 /* 1113 * cmservice.c 1114 */ 1115 extern bool afs_cm_incoming_call(struct afs_call *); 1116 1117 /* 1118 * dir.c 1119 */ 1120 extern const struct file_operations afs_dir_file_operations; 1121 extern const struct inode_operations afs_dir_inode_operations; 1122 extern const struct address_space_operations afs_dir_aops; 1123 extern const struct dentry_operations afs_fs_dentry_operations; 1124 1125 extern void afs_d_release(struct dentry *); 1126 extern void afs_check_for_remote_deletion(struct afs_operation *); 1127 1128 /* 1129 * dir_edit.c 1130 */ 1131 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 1132 enum afs_edit_dir_reason); 1133 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 1134 1135 /* 1136 * dir_silly.c 1137 */ 1138 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 1139 struct dentry *, struct key *); 1140 extern int afs_silly_iput(struct dentry *, struct inode *); 1141 1142 /* 1143 * dynroot.c 1144 */ 1145 extern const struct inode_operations afs_dynroot_inode_operations; 1146 extern const struct dentry_operations afs_dynroot_dentry_operations; 1147 1148 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 1149 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 1150 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 1151 extern int afs_dynroot_populate(struct super_block *); 1152 extern void afs_dynroot_depopulate(struct super_block *); 1153 1154 /* 1155 * file.c 1156 */ 1157 extern const struct address_space_operations afs_file_aops; 1158 extern const struct address_space_operations afs_symlink_aops; 1159 extern const struct inode_operations afs_file_inode_operations; 1160 extern const struct file_operations afs_file_operations; 1161 extern const struct netfs_request_ops afs_req_ops; 1162 1163 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 1164 extern void afs_put_wb_key(struct afs_wb_key *); 1165 extern int afs_open(struct inode *, struct file *); 1166 extern int afs_release(struct inode *, struct file *); 1167 extern int afs_fetch_data(struct afs_vnode *, struct afs_read *); 1168 extern struct afs_read *afs_alloc_read(gfp_t); 1169 extern void afs_put_read(struct afs_read *); 1170 extern int afs_write_inode(struct inode *, struct writeback_control *); 1171 1172 static inline struct afs_read *afs_get_read(struct afs_read *req) 1173 { 1174 refcount_inc(&req->usage); 1175 return req; 1176 } 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_wait_for_operation(struct afs_operation *); 1229 extern int afs_do_sync_operation(struct afs_operation *); 1230 1231 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1232 struct afs_vnode *vnode) 1233 { 1234 op->file[n].vnode = vnode; 1235 op->file[n].need_io_lock = true; 1236 } 1237 1238 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1239 const struct afs_fid *fid) 1240 { 1241 op->file[n].fid = *fid; 1242 } 1243 1244 /* 1245 * fs_probe.c 1246 */ 1247 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate, 1248 enum afs_estate_trace where); 1249 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where); 1250 extern void afs_fileserver_probe_result(struct afs_call *); 1251 void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server, 1252 struct afs_addr_list *new_addrs, struct key *key); 1253 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr); 1254 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1255 extern void afs_fs_probe_dispatcher(struct work_struct *); 1256 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate, 1257 unsigned long exclude, bool is_intr); 1258 extern void afs_fs_probe_cleanup(struct afs_net *); 1259 1260 /* 1261 * inode.c 1262 */ 1263 extern const struct afs_operation_ops afs_fetch_status_operation; 1264 1265 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1266 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1267 extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1268 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 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_make_call(struct afs_call *call, gfp_t gfp); 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 void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1406 gfp_t gfp) 1407 { 1408 struct afs_addr_list *alist = op->estate->addresses; 1409 1410 op->call = call; 1411 op->type = call->type; 1412 call->op = op; 1413 call->key = op->key; 1414 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1415 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer); 1416 call->service_id = op->server->service_id; 1417 afs_make_call(call, gfp); 1418 } 1419 1420 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1421 { 1422 call->iov_len = size; 1423 call->kvec[0].iov_base = buf; 1424 call->kvec[0].iov_len = size; 1425 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size); 1426 } 1427 1428 static inline void afs_extract_to_tmp(struct afs_call *call) 1429 { 1430 call->iov_len = sizeof(call->tmp); 1431 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1432 } 1433 1434 static inline void afs_extract_to_tmp64(struct afs_call *call) 1435 { 1436 call->iov_len = sizeof(call->tmp64); 1437 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1438 } 1439 1440 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1441 { 1442 call->iov_len = size; 1443 iov_iter_discard(&call->def_iter, ITER_DEST, size); 1444 } 1445 1446 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1447 { 1448 call->iov_len = size; 1449 afs_extract_begin(call, call->buffer, size); 1450 } 1451 1452 static inline int afs_transfer_reply(struct afs_call *call) 1453 { 1454 return afs_extract_data(call, false); 1455 } 1456 1457 static inline bool afs_check_call_state(struct afs_call *call, 1458 enum afs_call_state state) 1459 { 1460 return READ_ONCE(call->state) == state; 1461 } 1462 1463 static inline bool afs_set_call_state(struct afs_call *call, 1464 enum afs_call_state from, 1465 enum afs_call_state to) 1466 { 1467 bool ok = false; 1468 1469 spin_lock_bh(&call->state_lock); 1470 if (call->state == from) { 1471 call->state = to; 1472 trace_afs_call_state(call, from, to, 0, 0); 1473 ok = true; 1474 } 1475 spin_unlock_bh(&call->state_lock); 1476 return ok; 1477 } 1478 1479 static inline void afs_set_call_complete(struct afs_call *call, 1480 int error, u32 remote_abort) 1481 { 1482 enum afs_call_state state; 1483 bool ok = false; 1484 1485 spin_lock_bh(&call->state_lock); 1486 state = call->state; 1487 if (state != AFS_CALL_COMPLETE) { 1488 call->abort_code = remote_abort; 1489 call->error = error; 1490 call->state = AFS_CALL_COMPLETE; 1491 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1492 error, remote_abort); 1493 ok = true; 1494 } 1495 spin_unlock_bh(&call->state_lock); 1496 if (ok) { 1497 trace_afs_call_done(call); 1498 1499 /* Asynchronous calls have two refs to release - one from the alloc and 1500 * one queued with the work item - and we can't just deallocate the 1501 * call because the work item may be queued again. 1502 */ 1503 if (call->drop_ref) 1504 afs_put_call(call); 1505 } 1506 } 1507 1508 /* 1509 * security.c 1510 */ 1511 extern void afs_put_permits(struct afs_permits *); 1512 extern void afs_clear_permits(struct afs_vnode *); 1513 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1514 struct afs_status_cb *); 1515 extern struct key *afs_request_key(struct afs_cell *); 1516 extern struct key *afs_request_key_rcu(struct afs_cell *); 1517 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1518 extern int afs_permission(struct mnt_idmap *, struct inode *, int); 1519 extern void __exit afs_clean_up_permit_cache(void); 1520 1521 /* 1522 * server.c 1523 */ 1524 extern spinlock_t afs_server_peer_lock; 1525 1526 extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *); 1527 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1528 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1529 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1530 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace); 1531 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1532 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace); 1533 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1534 extern void afs_manage_servers(struct work_struct *); 1535 extern void afs_servers_timer(struct timer_list *); 1536 extern void afs_fs_probe_timer(struct timer_list *); 1537 extern void __net_exit afs_purge_servers(struct afs_net *); 1538 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key); 1539 1540 static inline void afs_inc_servers_outstanding(struct afs_net *net) 1541 { 1542 atomic_inc(&net->servers_outstanding); 1543 } 1544 1545 static inline void afs_dec_servers_outstanding(struct afs_net *net) 1546 { 1547 if (atomic_dec_and_test(&net->servers_outstanding)) 1548 wake_up_var(&net->servers_outstanding); 1549 } 1550 1551 static inline bool afs_is_probing_server(struct afs_server *server) 1552 { 1553 return list_empty(&server->probe_link); 1554 } 1555 1556 /* 1557 * server_list.c 1558 */ 1559 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1560 { 1561 refcount_inc(&slist->usage); 1562 return slist; 1563 } 1564 1565 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1566 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume, 1567 struct key *key, 1568 struct afs_vldb_entry *vldb); 1569 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1570 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist); 1571 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist, 1572 struct afs_server_list *old); 1573 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist); 1574 1575 /* 1576 * super.c 1577 */ 1578 extern int __init afs_fs_init(void); 1579 extern void afs_fs_exit(void); 1580 1581 /* 1582 * validation.c 1583 */ 1584 bool afs_check_validity(const struct afs_vnode *vnode); 1585 int afs_update_volume_state(struct afs_operation *op); 1586 int afs_validate(struct afs_vnode *vnode, struct key *key); 1587 1588 /* 1589 * vlclient.c 1590 */ 1591 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1592 const char *, int); 1593 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1594 struct afs_call *afs_vl_get_capabilities(struct afs_net *net, 1595 struct afs_addr_list *alist, 1596 unsigned int addr_index, 1597 struct key *key, 1598 struct afs_vlserver *server, 1599 unsigned int server_index); 1600 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1601 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1602 1603 /* 1604 * vl_alias.c 1605 */ 1606 extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1607 1608 /* 1609 * vl_probe.c 1610 */ 1611 extern void afs_vlserver_probe_result(struct afs_call *); 1612 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1613 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1614 1615 /* 1616 * vl_rotate.c 1617 */ 1618 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1619 struct afs_cell *, struct key *); 1620 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1621 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1622 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1623 1624 /* 1625 * vlserver_list.c 1626 */ 1627 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1628 { 1629 refcount_inc(&vlserver->ref); 1630 return vlserver; 1631 } 1632 1633 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1634 { 1635 if (vllist) 1636 refcount_inc(&vllist->ref); 1637 return vllist; 1638 } 1639 1640 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1641 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1642 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1643 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1644 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1645 const void *, size_t); 1646 1647 /* 1648 * volume.c 1649 */ 1650 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1651 extern int afs_activate_volume(struct afs_volume *); 1652 extern void afs_deactivate_volume(struct afs_volume *); 1653 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1654 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1655 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1656 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1657 1658 /* 1659 * write.c 1660 */ 1661 #ifdef CONFIG_AFS_FSCACHE 1662 bool afs_dirty_folio(struct address_space *, struct folio *); 1663 #else 1664 #define afs_dirty_folio filemap_dirty_folio 1665 #endif 1666 extern int afs_write_begin(struct file *file, struct address_space *mapping, 1667 loff_t pos, unsigned len, 1668 struct page **pagep, void **fsdata); 1669 extern int afs_write_end(struct file *file, struct address_space *mapping, 1670 loff_t pos, unsigned len, unsigned copied, 1671 struct page *page, void *fsdata); 1672 extern int afs_writepage(struct page *, struct writeback_control *); 1673 extern int afs_writepages(struct address_space *, struct writeback_control *); 1674 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 1675 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1676 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1677 extern void afs_prune_wb_keys(struct afs_vnode *); 1678 int afs_launder_folio(struct folio *); 1679 1680 /* 1681 * xattr.c 1682 */ 1683 extern const struct xattr_handler * const afs_xattr_handlers[]; 1684 1685 /* 1686 * yfsclient.c 1687 */ 1688 extern void yfs_fs_fetch_data(struct afs_operation *); 1689 extern void yfs_fs_create_file(struct afs_operation *); 1690 extern void yfs_fs_make_dir(struct afs_operation *); 1691 extern void yfs_fs_remove_file2(struct afs_operation *); 1692 extern void yfs_fs_remove_file(struct afs_operation *); 1693 extern void yfs_fs_remove_dir(struct afs_operation *); 1694 extern void yfs_fs_link(struct afs_operation *); 1695 extern void yfs_fs_symlink(struct afs_operation *); 1696 extern void yfs_fs_rename(struct afs_operation *); 1697 extern void yfs_fs_store_data(struct afs_operation *); 1698 extern void yfs_fs_setattr(struct afs_operation *); 1699 extern void yfs_fs_get_volume_status(struct afs_operation *); 1700 extern void yfs_fs_set_lock(struct afs_operation *); 1701 extern void yfs_fs_extend_lock(struct afs_operation *); 1702 extern void yfs_fs_release_lock(struct afs_operation *); 1703 extern void yfs_fs_fetch_status(struct afs_operation *); 1704 extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1705 1706 struct yfs_acl { 1707 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1708 struct afs_acl *vol_acl; /* Whole volume ACL */ 1709 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1710 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1711 unsigned int flags; 1712 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1713 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1714 }; 1715 1716 extern void yfs_free_opaque_acl(struct yfs_acl *); 1717 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1718 extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1719 1720 /* 1721 * Miscellaneous inline functions. 1722 */ 1723 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1724 { 1725 return container_of(inode, struct afs_vnode, netfs.inode); 1726 } 1727 1728 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1729 { 1730 return &vnode->netfs.inode; 1731 } 1732 1733 /* 1734 * Note that a dentry got changed. We need to set d_fsdata to the data version 1735 * number derived from the result of the operation. It doesn't matter if 1736 * d_fsdata goes backwards as we'll just revalidate. 1737 */ 1738 static inline void afs_update_dentry_version(struct afs_operation *op, 1739 struct afs_vnode_param *dir_vp, 1740 struct dentry *dentry) 1741 { 1742 if (!op->cumul_error.error) 1743 dentry->d_fsdata = 1744 (void *)(unsigned long)dir_vp->scb.status.data_version; 1745 } 1746 1747 /* 1748 * Set the file size and block count. Estimate the number of 512 bytes blocks 1749 * used, rounded up to nearest 1K for consistency with other AFS clients. 1750 */ 1751 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size) 1752 { 1753 i_size_write(&vnode->netfs.inode, size); 1754 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1; 1755 } 1756 1757 /* 1758 * Check for a conflicting operation on a directory that we just unlinked from. 1759 * If someone managed to sneak a link or an unlink in on the file we just 1760 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS). 1761 */ 1762 static inline void afs_check_dir_conflict(struct afs_operation *op, 1763 struct afs_vnode_param *dvp) 1764 { 1765 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version) 1766 op->flags |= AFS_OPERATION_DIR_CONFLICT; 1767 } 1768 1769 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1770 { 1771 trace_afs_io_error(call->debug_id, -EIO, where); 1772 return -EIO; 1773 } 1774 1775 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1776 { 1777 trace_afs_file_error(vnode, -EIO, where); 1778 return -EIO; 1779 } 1780 1781 /*****************************************************************************/ 1782 /* 1783 * debug tracing 1784 */ 1785 extern unsigned afs_debug; 1786 1787 #define dbgprintk(FMT,...) \ 1788 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1789 1790 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1791 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1792 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1793 1794 1795 #if defined(__KDEBUG) 1796 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1797 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1798 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1799 1800 #elif defined(CONFIG_AFS_DEBUG) 1801 #define AFS_DEBUG_KENTER 0x01 1802 #define AFS_DEBUG_KLEAVE 0x02 1803 #define AFS_DEBUG_KDEBUG 0x04 1804 1805 #define _enter(FMT,...) \ 1806 do { \ 1807 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1808 kenter(FMT,##__VA_ARGS__); \ 1809 } while (0) 1810 1811 #define _leave(FMT,...) \ 1812 do { \ 1813 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1814 kleave(FMT,##__VA_ARGS__); \ 1815 } while (0) 1816 1817 #define _debug(FMT,...) \ 1818 do { \ 1819 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1820 kdebug(FMT,##__VA_ARGS__); \ 1821 } while (0) 1822 1823 #else 1824 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1825 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1826 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1827 #endif 1828 1829 /* 1830 * debug assertion checking 1831 */ 1832 #if 1 // defined(__KDEBUGALL) 1833 1834 #define ASSERT(X) \ 1835 do { \ 1836 if (unlikely(!(X))) { \ 1837 printk(KERN_ERR "\n"); \ 1838 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1839 BUG(); \ 1840 } \ 1841 } while(0) 1842 1843 #define ASSERTCMP(X, OP, Y) \ 1844 do { \ 1845 if (unlikely(!((X) OP (Y)))) { \ 1846 printk(KERN_ERR "\n"); \ 1847 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1848 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1849 (unsigned long)(X), (unsigned long)(Y)); \ 1850 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1851 (unsigned long)(X), (unsigned long)(Y)); \ 1852 BUG(); \ 1853 } \ 1854 } while(0) 1855 1856 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1857 do { \ 1858 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1859 printk(KERN_ERR "\n"); \ 1860 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1861 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1862 (unsigned long)(L), (unsigned long)(N), \ 1863 (unsigned long)(H)); \ 1864 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1865 (unsigned long)(L), (unsigned long)(N), \ 1866 (unsigned long)(H)); \ 1867 BUG(); \ 1868 } \ 1869 } while(0) 1870 1871 #define ASSERTIF(C, X) \ 1872 do { \ 1873 if (unlikely((C) && !(X))) { \ 1874 printk(KERN_ERR "\n"); \ 1875 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1876 BUG(); \ 1877 } \ 1878 } while(0) 1879 1880 #define ASSERTIFCMP(C, X, OP, Y) \ 1881 do { \ 1882 if (unlikely((C) && !((X) OP (Y)))) { \ 1883 printk(KERN_ERR "\n"); \ 1884 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1885 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1886 (unsigned long)(X), (unsigned long)(Y)); \ 1887 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1888 (unsigned long)(X), (unsigned long)(Y)); \ 1889 BUG(); \ 1890 } \ 1891 } while(0) 1892 1893 #else 1894 1895 #define ASSERT(X) \ 1896 do { \ 1897 } while(0) 1898 1899 #define ASSERTCMP(X, OP, Y) \ 1900 do { \ 1901 } while(0) 1902 1903 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1904 do { \ 1905 } while(0) 1906 1907 #define ASSERTIF(C, X) \ 1908 do { \ 1909 } while(0) 1910 1911 #define ASSERTIFCMP(C, X, OP, Y) \ 1912 do { \ 1913 } while(0) 1914 1915 #endif /* __KDEBUGALL */ 1916