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 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 int max_lifespan; /* Maximum lifespan in secs to set if not 0 */ 167 unsigned request_size; /* size of request data */ 168 unsigned reply_max; /* maximum size of reply */ 169 unsigned count2; /* count used in unmarshalling */ 170 unsigned char unmarshall; /* unmarshalling phase */ 171 bool drop_ref; /* T if need to drop ref for incoming call */ 172 bool need_attention; /* T if RxRPC poked us */ 173 bool async; /* T if asynchronous */ 174 bool upgrade; /* T to request service upgrade */ 175 bool intr; /* T if interruptible */ 176 bool unmarshalling_error; /* T if an unmarshalling error occurred */ 177 bool responded; /* Got a response from the call (may be abort) */ 178 u16 service_id; /* Actual service ID (after upgrade) */ 179 unsigned int debug_id; /* Trace ID */ 180 u32 operation_ID; /* operation ID for an incoming call */ 181 u32 count; /* count for use in unmarshalling */ 182 union { /* place to extract temporary data */ 183 struct { 184 __be32 tmp_u; 185 __be32 tmp; 186 } __attribute__((packed)); 187 __be64 tmp64; 188 }; 189 ktime_t issue_time; /* Time of issue of operation */ 190 }; 191 192 struct afs_call_type { 193 const char *name; 194 unsigned int op; /* Really enum afs_fs_operation */ 195 196 /* deliver request or reply data to an call 197 * - returning an error will cause the call to be aborted 198 */ 199 int (*deliver)(struct afs_call *call); 200 201 /* clean up a call */ 202 void (*destructor)(struct afs_call *call); 203 204 /* Work function */ 205 void (*work)(struct work_struct *work); 206 207 /* Call done function (gets called immediately on success or failure) */ 208 void (*done)(struct afs_call *call); 209 }; 210 211 /* 212 * Key available for writeback on a file. 213 */ 214 struct afs_wb_key { 215 refcount_t usage; 216 struct key *key; 217 struct list_head vnode_link; /* Link in vnode->wb_keys */ 218 }; 219 220 /* 221 * AFS open file information record. Pointed to by file->private_data. 222 */ 223 struct afs_file { 224 struct key *key; /* The key this file was opened with */ 225 struct afs_wb_key *wb; /* Writeback key record for this file */ 226 }; 227 afs_file_key(struct file * file)228 static inline struct key *afs_file_key(struct file *file) 229 { 230 struct afs_file *af = file->private_data; 231 232 return af->key; 233 } 234 235 /* 236 * Record of an outstanding read operation on a vnode. 237 */ 238 struct afs_read { 239 loff_t pos; /* Where to start reading */ 240 loff_t len; /* How much we're asking for */ 241 loff_t actual_len; /* How much we're actually getting */ 242 loff_t file_size; /* File size returned by server */ 243 struct key *key; /* The key to use to reissue the read */ 244 struct afs_vnode *vnode; /* The file being read into. */ 245 struct netfs_io_subrequest *subreq; /* Fscache helper read request this belongs to */ 246 afs_dataversion_t data_version; /* Version number returned by server */ 247 refcount_t usage; 248 unsigned int call_debug_id; 249 unsigned int nr_pages; 250 int error; 251 void (*done)(struct afs_read *); 252 void (*cleanup)(struct afs_read *); 253 struct iov_iter *iter; /* Iterator representing the buffer */ 254 struct iov_iter def_iter; /* Default iterator */ 255 }; 256 257 /* 258 * AFS superblock private data 259 * - there's one superblock per volume 260 */ 261 struct afs_super_info { 262 struct net *net_ns; /* Network namespace */ 263 struct afs_cell *cell; /* The cell in which the volume resides */ 264 struct afs_volume *volume; /* volume record */ 265 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */ 266 bool dyn_root; /* True if dynamic root */ 267 }; 268 AFS_FS_S(struct super_block * sb)269 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 270 { 271 return sb->s_fs_info; 272 } 273 274 extern struct file_system_type afs_fs_type; 275 276 /* 277 * Set of substitutes for @sys. 278 */ 279 struct afs_sysnames { 280 #define AFS_NR_SYSNAME 16 281 char *subs[AFS_NR_SYSNAME]; 282 refcount_t usage; 283 unsigned short nr; 284 char blank[1]; 285 }; 286 287 /* 288 * AFS network namespace record. 289 */ 290 struct afs_net { 291 struct net *net; /* Backpointer to the owning net namespace */ 292 struct afs_uuid uuid; 293 bool live; /* F if this namespace is being removed */ 294 295 /* AF_RXRPC I/O stuff */ 296 struct socket *socket; 297 struct afs_call *spare_incoming_call; 298 struct work_struct charge_preallocation_work; 299 struct mutex socket_mutex; 300 atomic_t nr_outstanding_calls; 301 atomic_t nr_superblocks; 302 303 /* Cell database */ 304 struct rb_root cells; 305 struct afs_cell *ws_cell; 306 struct work_struct cells_manager; 307 struct timer_list cells_timer; 308 atomic_t cells_outstanding; 309 struct rw_semaphore cells_lock; 310 struct mutex cells_alias_lock; 311 312 struct mutex proc_cells_lock; 313 struct hlist_head proc_cells; 314 315 /* Known servers. Theoretically each fileserver can only be in one 316 * cell, but in practice, people create aliases and subsets and there's 317 * no easy way to distinguish them. 318 */ 319 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */ 320 struct rb_root fs_servers; /* afs_server (by server UUID or address) */ 321 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */ 322 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */ 323 struct hlist_head fs_proc; /* procfs servers list */ 324 325 struct hlist_head fs_addresses; /* 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 addr_link; /* Link in net->fs_addresses6 */ 565 struct hlist_node proc_link; /* Link in net->fs_proc */ 566 struct list_head volumes; /* RCU list of afs_server_entry objects */ 567 struct afs_server *gc_next; /* Next server in manager's list */ 568 time64_t unuse_time; /* Time at which last unused */ 569 unsigned long flags; 570 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 571 #define AFS_SERVER_FL_UPDATING 1 572 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 573 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */ 574 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */ 575 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */ 576 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 577 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 578 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 579 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 580 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */ 581 refcount_t ref; /* Object refcount */ 582 atomic_t active; /* Active user count */ 583 u32 addr_version; /* Address list version */ 584 u16 service_id; /* Service ID we're using. */ 585 unsigned int rtt; /* Server's current RTT in uS */ 586 unsigned int debug_id; /* Debugging ID for traces */ 587 588 /* file service access */ 589 rwlock_t fs_lock; /* access lock */ 590 591 /* Probe state */ 592 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */ 593 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 594 wait_queue_head_t probe_wq; 595 unsigned int probe_counter; /* Number of probes issued */ 596 spinlock_t probe_lock; 597 }; 598 599 enum afs_ro_replicating { 600 AFS_RO_NOT_REPLICATING, /* Not doing replication */ 601 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */ 602 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */ 603 } __mode(byte); 604 605 /* 606 * Replaceable volume server list. 607 */ 608 struct afs_server_entry { 609 struct afs_server *server; 610 struct afs_volume *volume; 611 struct list_head slink; /* Link in server->volumes */ 612 time64_t cb_expires_at; /* Time at which volume-level callback expires */ 613 unsigned long flags; 614 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */ 615 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */ 616 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */ 617 }; 618 619 struct afs_server_list { 620 struct rcu_head rcu; 621 refcount_t usage; 622 bool attached; /* T if attached to servers */ 623 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */ 624 unsigned char nr_servers; 625 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 626 unsigned int seq; /* Set to ->servers_seq when installed */ 627 rwlock_t lock; 628 struct afs_server_entry servers[]; 629 }; 630 631 /* 632 * Live AFS volume management. 633 */ 634 struct afs_volume { 635 struct rcu_head rcu; 636 afs_volid_t vid; /* The volume ID of this volume */ 637 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */ 638 refcount_t ref; 639 time64_t update_at; /* Time at which to next update */ 640 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 641 struct rb_node cell_node; /* Link in cell->volumes */ 642 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 643 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 644 struct work_struct destructor; /* Deferred destructor */ 645 unsigned long flags; 646 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 647 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 648 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 649 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 650 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */ 651 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */ 652 #ifdef CONFIG_AFS_FSCACHE 653 struct fscache_volume *cache; /* Caching cookie */ 654 #endif 655 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 656 rwlock_t servers_lock; /* Lock for ->servers */ 657 unsigned int servers_seq; /* Incremented each time ->servers changes */ 658 659 /* RO release tracking */ 660 struct mutex volsync_lock; /* Time/state evaluation lock */ 661 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */ 662 time64_t update_time; /* Volume update time (or TIME64_MIN) */ 663 664 /* Callback management */ 665 struct mutex cb_check_lock; /* Lock to control race to check after v_break */ 666 time64_t cb_expires_at; /* Earliest volume callback expiry time */ 667 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */ 668 atomic_t cb_v_break; /* Volume-break event counter. */ 669 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */ 670 atomic_t cb_scrub; /* Scrub-all-data event counter. */ 671 rwlock_t cb_v_break_lock; 672 struct rw_semaphore open_mmaps_lock; 673 struct list_head open_mmaps; /* List of vnodes that are mmapped */ 674 675 afs_voltype_t type; /* type of volume */ 676 char type_force; /* force volume type (suppress R/O -> R/W) */ 677 u8 name_len; 678 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 679 }; 680 681 enum afs_lock_state { 682 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 683 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 684 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 685 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 686 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 687 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 688 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 689 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 690 }; 691 692 /* 693 * AFS inode private data. 694 * 695 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 696 * leak from one inode to another. 697 */ 698 struct afs_vnode { 699 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 700 struct afs_volume *volume; /* volume on which vnode resides */ 701 struct afs_fid fid; /* the file identifier for this inode */ 702 struct afs_file_status status; /* AFS status info for this file */ 703 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 704 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 705 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 706 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 707 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 708 struct key *silly_key; /* Silly rename key */ 709 spinlock_t wb_lock; /* lock for wb_keys */ 710 spinlock_t lock; /* waitqueue/flags lock */ 711 unsigned long flags; 712 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 713 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 714 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 715 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 716 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 717 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 718 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 719 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 720 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */ 721 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */ 722 723 struct list_head wb_keys; /* List of keys available for writeback */ 724 struct list_head pending_locks; /* locks waiting to be granted */ 725 struct list_head granted_locks; /* locks granted on this file */ 726 struct delayed_work lock_work; /* work to be done in locking */ 727 struct key *lock_key; /* Key to be used in lock ops */ 728 ktime_t locked_at; /* Time at which lock obtained */ 729 enum afs_lock_state lock_state : 8; 730 afs_lock_type_t lock_type : 8; 731 732 /* outstanding callback notification on this file */ 733 struct work_struct cb_work; /* Work for mmap'd files */ 734 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */ 735 void *cb_server; /* Server with callback/filelock */ 736 atomic_t cb_nr_mmap; /* Number of mmaps */ 737 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */ 738 unsigned int cb_scrub; /* Scrub counter on ->volume */ 739 unsigned int cb_break; /* Break counter on vnode */ 740 unsigned int cb_v_check; /* Break check counter on ->volume */ 741 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 742 743 atomic64_t cb_expires_at; /* time at which callback expires */ 744 #define AFS_NO_CB_PROMISE TIME64_MIN 745 }; 746 afs_vnode_cache(struct afs_vnode * vnode)747 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 748 { 749 #ifdef CONFIG_AFS_FSCACHE 750 return netfs_i_cookie(&vnode->netfs); 751 #else 752 return NULL; 753 #endif 754 } 755 afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)756 static inline void afs_vnode_set_cache(struct afs_vnode *vnode, 757 struct fscache_cookie *cookie) 758 { 759 #ifdef CONFIG_AFS_FSCACHE 760 vnode->netfs.cache = cookie; 761 if (cookie) 762 mapping_set_release_always(vnode->netfs.inode.i_mapping); 763 #endif 764 } 765 766 /* 767 * cached security record for one user's attempt to access a vnode 768 */ 769 struct afs_permit { 770 struct key *key; /* RxRPC ticket holding a security context */ 771 afs_access_t access; /* CallerAccess value for this key */ 772 }; 773 774 /* 775 * Immutable cache of CallerAccess records from attempts to access vnodes. 776 * These may be shared between multiple vnodes. 777 */ 778 struct afs_permits { 779 struct rcu_head rcu; 780 struct hlist_node hash_node; /* Link in hash */ 781 unsigned long h; /* Hash value for this permit list */ 782 refcount_t usage; 783 unsigned short nr_permits; /* Number of records */ 784 bool invalidated; /* Invalidated due to key change */ 785 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */ 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 const char *symlink; 900 } create; 901 struct { 902 bool need_rehash; 903 } unlink; 904 struct { 905 struct dentry *rehash; 906 struct dentry *tmp; 907 bool new_negative; 908 } rename; 909 struct { 910 struct afs_read *req; 911 } fetch; 912 struct { 913 afs_lock_type_t type; 914 } lock; 915 struct { 916 struct iov_iter *write_iter; 917 loff_t pos; 918 loff_t size; 919 loff_t i_size; 920 } store; 921 struct { 922 struct iattr *attr; 923 loff_t old_i_size; 924 } setattr; 925 struct afs_acl *acl; 926 struct yfs_acl *yacl; 927 struct { 928 struct afs_volume_status vs; 929 struct kstatfs *buf; 930 } volstatus; 931 }; 932 933 /* Fileserver iteration state */ 934 struct afs_server_list *server_list; /* Current server list (pins ref) */ 935 struct afs_server *server; /* Server we're using (ref pinned by server_list) */ 936 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */ 937 struct afs_server_state *server_states; /* States of the servers involved */ 938 struct afs_call *call; 939 unsigned long untried_servers; /* Bitmask of untried servers */ 940 unsigned long addr_tried; /* Tried addresses */ 941 s32 call_abort_code; /* Abort code from single call */ 942 short call_error; /* Error from single call */ 943 short server_index; /* Current server */ 944 short nr_iterations; /* Number of server iterations */ 945 signed char addr_index; /* Current address */ 946 bool call_responded; /* T if the current address responded */ 947 948 unsigned int flags; 949 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */ 950 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */ 951 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */ 952 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */ 953 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */ 954 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */ 955 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */ 956 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */ 957 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */ 958 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */ 959 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */ 960 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */ 961 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */ 962 }; 963 964 /* 965 * Cache auxiliary data. 966 */ 967 struct afs_vnode_cache_aux { 968 __be64 data_version; 969 } __packed; 970 afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)971 static inline void afs_set_cache_aux(struct afs_vnode *vnode, 972 struct afs_vnode_cache_aux *aux) 973 { 974 aux->data_version = cpu_to_be64(vnode->status.data_version); 975 } 976 afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)977 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags) 978 { 979 struct afs_vnode_cache_aux aux; 980 981 afs_set_cache_aux(vnode, &aux); 982 fscache_invalidate(afs_vnode_cache(vnode), &aux, 983 i_size_read(&vnode->netfs.inode), flags); 984 } 985 986 #include <trace/events/afs.h> 987 988 /*****************************************************************************/ 989 /* 990 * addr_list.c 991 */ 992 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 993 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr); 994 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 995 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 996 const char *, size_t, char, 997 unsigned short, unsigned short); 998 bool afs_addr_list_same(const struct afs_addr_list *a, 999 const struct afs_addr_list *b); 1000 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 1001 1002 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr, 1003 __be32 xdr, u16 port); 1004 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr, 1005 __be32 *xdr, u16 port); 1006 1007 /* 1008 * addr_prefs.c 1009 */ 1010 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size); 1011 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist); 1012 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist); 1013 1014 /* 1015 * callback.c 1016 */ 1017 extern void afs_invalidate_mmap_work(struct work_struct *); 1018 extern void afs_init_callback_state(struct afs_server *); 1019 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1020 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1021 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 1022 afs_calc_vnode_cb_break(struct afs_vnode * vnode)1023 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode) 1024 { 1025 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub; 1026 } 1027 afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)1028 static inline bool afs_cb_is_broken(unsigned int cb_break, 1029 const struct afs_vnode *vnode) 1030 { 1031 return cb_break != (vnode->cb_break + 1032 atomic_read(&vnode->volume->cb_ro_snapshot) + 1033 atomic_read(&vnode->volume->cb_scrub)); 1034 } 1035 1036 /* 1037 * cell.c 1038 */ 1039 extern int afs_cell_init(struct afs_net *, const char *); 1040 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned, 1041 enum afs_cell_trace); 1042 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 1043 const char *, bool); 1044 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace); 1045 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace); 1046 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace); 1047 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace); 1048 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace); 1049 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace); 1050 extern void afs_manage_cells(struct work_struct *); 1051 extern void afs_cells_timer(struct timer_list *); 1052 extern void __net_exit afs_cell_purge(struct afs_net *); 1053 1054 /* 1055 * cmservice.c 1056 */ 1057 extern bool afs_cm_incoming_call(struct afs_call *); 1058 1059 /* 1060 * dir.c 1061 */ 1062 extern const struct file_operations afs_dir_file_operations; 1063 extern const struct inode_operations afs_dir_inode_operations; 1064 extern const struct address_space_operations afs_dir_aops; 1065 extern const struct dentry_operations afs_fs_dentry_operations; 1066 1067 extern void afs_d_release(struct dentry *); 1068 extern void afs_check_for_remote_deletion(struct afs_operation *); 1069 1070 /* 1071 * dir_edit.c 1072 */ 1073 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 1074 enum afs_edit_dir_reason); 1075 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 1076 void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode, 1077 enum afs_edit_dir_reason why); 1078 1079 /* 1080 * dir_silly.c 1081 */ 1082 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 1083 struct dentry *, struct key *); 1084 extern int afs_silly_iput(struct dentry *, struct inode *); 1085 1086 /* 1087 * dynroot.c 1088 */ 1089 extern const struct inode_operations afs_dynroot_inode_operations; 1090 extern const struct dentry_operations afs_dynroot_dentry_operations; 1091 1092 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 1093 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 1094 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 1095 extern int afs_dynroot_populate(struct super_block *); 1096 extern void afs_dynroot_depopulate(struct super_block *); 1097 1098 /* 1099 * file.c 1100 */ 1101 extern const struct address_space_operations afs_file_aops; 1102 extern const struct address_space_operations afs_symlink_aops; 1103 extern const struct inode_operations afs_file_inode_operations; 1104 extern const struct file_operations afs_file_operations; 1105 extern const struct netfs_request_ops afs_req_ops; 1106 1107 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 1108 extern void afs_put_wb_key(struct afs_wb_key *); 1109 extern int afs_open(struct inode *, struct file *); 1110 extern int afs_release(struct inode *, struct file *); 1111 extern int afs_fetch_data(struct afs_vnode *, struct afs_read *); 1112 extern struct afs_read *afs_alloc_read(gfp_t); 1113 extern void afs_put_read(struct afs_read *); 1114 afs_get_read(struct afs_read * req)1115 static inline struct afs_read *afs_get_read(struct afs_read *req) 1116 { 1117 refcount_inc(&req->usage); 1118 return req; 1119 } 1120 1121 /* 1122 * flock.c 1123 */ 1124 extern struct workqueue_struct *afs_lock_manager; 1125 1126 extern void afs_lock_op_done(struct afs_call *); 1127 extern void afs_lock_work(struct work_struct *); 1128 extern void afs_lock_may_be_available(struct afs_vnode *); 1129 extern int afs_lock(struct file *, int, struct file_lock *); 1130 extern int afs_flock(struct file *, int, struct file_lock *); 1131 1132 /* 1133 * fsclient.c 1134 */ 1135 extern void afs_fs_fetch_status(struct afs_operation *); 1136 extern void afs_fs_fetch_data(struct afs_operation *); 1137 extern void afs_fs_create_file(struct afs_operation *); 1138 extern void afs_fs_make_dir(struct afs_operation *); 1139 extern void afs_fs_remove_file(struct afs_operation *); 1140 extern void afs_fs_remove_dir(struct afs_operation *); 1141 extern void afs_fs_link(struct afs_operation *); 1142 extern void afs_fs_symlink(struct afs_operation *); 1143 extern void afs_fs_rename(struct afs_operation *); 1144 extern void afs_fs_store_data(struct afs_operation *); 1145 extern void afs_fs_setattr(struct afs_operation *); 1146 extern void afs_fs_get_volume_status(struct afs_operation *); 1147 extern void afs_fs_set_lock(struct afs_operation *); 1148 extern void afs_fs_extend_lock(struct afs_operation *); 1149 extern void afs_fs_release_lock(struct afs_operation *); 1150 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server, 1151 struct afs_address *addr, struct key *key); 1152 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server, 1153 struct afs_endpoint_state *estate, unsigned int addr_index, 1154 struct key *key); 1155 extern void afs_fs_inline_bulk_status(struct afs_operation *); 1156 1157 struct afs_acl { 1158 u32 size; 1159 u8 data[] __counted_by(size); 1160 }; 1161 1162 extern void afs_fs_fetch_acl(struct afs_operation *); 1163 extern void afs_fs_store_acl(struct afs_operation *); 1164 1165 /* 1166 * fs_operation.c 1167 */ 1168 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *); 1169 extern int afs_put_operation(struct afs_operation *); 1170 extern bool afs_begin_vnode_operation(struct afs_operation *); 1171 extern void afs_wait_for_operation(struct afs_operation *); 1172 extern int afs_do_sync_operation(struct afs_operation *); 1173 afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1174 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1175 struct afs_vnode *vnode) 1176 { 1177 op->file[n].vnode = vnode; 1178 op->file[n].need_io_lock = true; 1179 } 1180 afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1181 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1182 const struct afs_fid *fid) 1183 { 1184 op->file[n].fid = *fid; 1185 } 1186 1187 /* 1188 * fs_probe.c 1189 */ 1190 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate, 1191 enum afs_estate_trace where); 1192 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where); 1193 extern void afs_fileserver_probe_result(struct afs_call *); 1194 void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server, 1195 struct afs_addr_list *new_addrs, struct key *key); 1196 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr); 1197 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1198 extern void afs_fs_probe_dispatcher(struct work_struct *); 1199 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate, 1200 unsigned long exclude, bool is_intr); 1201 extern void afs_fs_probe_cleanup(struct afs_net *); 1202 1203 /* 1204 * inode.c 1205 */ 1206 extern const struct afs_operation_ops afs_fetch_status_operation; 1207 1208 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1209 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1210 extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1211 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1212 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *); 1213 extern struct inode *afs_root_iget(struct super_block *, struct key *); 1214 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *, 1215 struct kstat *, u32, unsigned int); 1216 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *); 1217 extern void afs_evict_inode(struct inode *); 1218 extern int afs_drop_inode(struct inode *); 1219 1220 /* 1221 * main.c 1222 */ 1223 extern struct workqueue_struct *afs_wq; 1224 extern int afs_net_id; 1225 afs_net(struct net * net)1226 static inline struct afs_net *afs_net(struct net *net) 1227 { 1228 return net_generic(net, afs_net_id); 1229 } 1230 afs_sb2net(struct super_block * sb)1231 static inline struct afs_net *afs_sb2net(struct super_block *sb) 1232 { 1233 return afs_net(AFS_FS_S(sb)->net_ns); 1234 } 1235 afs_d2net(struct dentry * dentry)1236 static inline struct afs_net *afs_d2net(struct dentry *dentry) 1237 { 1238 return afs_sb2net(dentry->d_sb); 1239 } 1240 afs_i2net(struct inode * inode)1241 static inline struct afs_net *afs_i2net(struct inode *inode) 1242 { 1243 return afs_sb2net(inode->i_sb); 1244 } 1245 afs_v2net(struct afs_vnode * vnode)1246 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1247 { 1248 return afs_i2net(&vnode->netfs.inode); 1249 } 1250 afs_sock2net(struct sock * sk)1251 static inline struct afs_net *afs_sock2net(struct sock *sk) 1252 { 1253 return net_generic(sock_net(sk), afs_net_id); 1254 } 1255 __afs_stat(atomic_t * s)1256 static inline void __afs_stat(atomic_t *s) 1257 { 1258 atomic_inc(s); 1259 } 1260 1261 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1262 1263 /* 1264 * misc.c 1265 */ 1266 extern int afs_abort_to_error(u32); 1267 extern void afs_prioritise_error(struct afs_error *, int, u32); 1268 afs_op_nomem(struct afs_operation * op)1269 static inline void afs_op_nomem(struct afs_operation *op) 1270 { 1271 op->cumul_error.error = -ENOMEM; 1272 } 1273 afs_op_error(const struct afs_operation * op)1274 static inline int afs_op_error(const struct afs_operation *op) 1275 { 1276 return op->cumul_error.error; 1277 } 1278 afs_op_abort_code(const struct afs_operation * op)1279 static inline s32 afs_op_abort_code(const struct afs_operation *op) 1280 { 1281 return op->cumul_error.abort_code; 1282 } 1283 afs_op_set_error(struct afs_operation * op,int error)1284 static inline int afs_op_set_error(struct afs_operation *op, int error) 1285 { 1286 return op->cumul_error.error = error; 1287 } 1288 afs_op_accumulate_error(struct afs_operation * op,int error,s32 abort_code)1289 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code) 1290 { 1291 afs_prioritise_error(&op->cumul_error, error, abort_code); 1292 } 1293 1294 /* 1295 * mntpt.c 1296 */ 1297 extern const struct inode_operations afs_mntpt_inode_operations; 1298 extern const struct inode_operations afs_autocell_inode_operations; 1299 extern const struct file_operations afs_mntpt_file_operations; 1300 1301 extern struct vfsmount *afs_d_automount(struct path *); 1302 extern void afs_mntpt_kill_timer(void); 1303 1304 /* 1305 * proc.c 1306 */ 1307 #ifdef CONFIG_PROC_FS 1308 extern int __net_init afs_proc_init(struct afs_net *); 1309 extern void __net_exit afs_proc_cleanup(struct afs_net *); 1310 extern int afs_proc_cell_setup(struct afs_cell *); 1311 extern void afs_proc_cell_remove(struct afs_cell *); 1312 extern void afs_put_sysnames(struct afs_sysnames *); 1313 #else afs_proc_init(struct afs_net * net)1314 static inline int afs_proc_init(struct afs_net *net) { return 0; } afs_proc_cleanup(struct afs_net * net)1315 static inline void afs_proc_cleanup(struct afs_net *net) {} afs_proc_cell_setup(struct afs_cell * cell)1316 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } afs_proc_cell_remove(struct afs_cell * cell)1317 static inline void afs_proc_cell_remove(struct afs_cell *cell) {} afs_put_sysnames(struct afs_sysnames * sysnames)1318 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1319 #endif 1320 1321 /* 1322 * rotate.c 1323 */ 1324 void afs_clear_server_states(struct afs_operation *op); 1325 extern bool afs_select_fileserver(struct afs_operation *); 1326 extern void afs_dump_edestaddrreq(const struct afs_operation *); 1327 1328 /* 1329 * rxrpc.c 1330 */ 1331 extern struct workqueue_struct *afs_async_calls; 1332 1333 extern int __net_init afs_open_socket(struct afs_net *); 1334 extern void __net_exit afs_close_socket(struct afs_net *); 1335 extern void afs_charge_preallocation(struct work_struct *); 1336 extern void afs_put_call(struct afs_call *); 1337 void afs_deferred_put_call(struct afs_call *call); 1338 void afs_make_call(struct afs_call *call, gfp_t gfp); 1339 void afs_wait_for_call_to_complete(struct afs_call *call); 1340 extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1341 const struct afs_call_type *, 1342 size_t, size_t); 1343 extern void afs_flat_call_destructor(struct afs_call *); 1344 extern void afs_send_empty_reply(struct afs_call *); 1345 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1346 extern int afs_extract_data(struct afs_call *, bool); 1347 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause); 1348 afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1349 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1350 gfp_t gfp) 1351 { 1352 struct afs_addr_list *alist = op->estate->addresses; 1353 1354 op->call = call; 1355 op->type = call->type; 1356 call->op = op; 1357 call->key = op->key; 1358 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1359 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer); 1360 call->service_id = op->server->service_id; 1361 afs_make_call(call, gfp); 1362 } 1363 afs_extract_begin(struct afs_call * call,void * buf,size_t size)1364 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1365 { 1366 call->iov_len = size; 1367 call->kvec[0].iov_base = buf; 1368 call->kvec[0].iov_len = size; 1369 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size); 1370 } 1371 afs_extract_to_tmp(struct afs_call * call)1372 static inline void afs_extract_to_tmp(struct afs_call *call) 1373 { 1374 call->iov_len = sizeof(call->tmp); 1375 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1376 } 1377 afs_extract_to_tmp64(struct afs_call * call)1378 static inline void afs_extract_to_tmp64(struct afs_call *call) 1379 { 1380 call->iov_len = sizeof(call->tmp64); 1381 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1382 } 1383 afs_extract_discard(struct afs_call * call,size_t size)1384 static inline void afs_extract_discard(struct afs_call *call, size_t size) 1385 { 1386 call->iov_len = size; 1387 iov_iter_discard(&call->def_iter, ITER_DEST, size); 1388 } 1389 afs_extract_to_buf(struct afs_call * call,size_t size)1390 static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1391 { 1392 call->iov_len = size; 1393 afs_extract_begin(call, call->buffer, size); 1394 } 1395 afs_transfer_reply(struct afs_call * call)1396 static inline int afs_transfer_reply(struct afs_call *call) 1397 { 1398 return afs_extract_data(call, false); 1399 } 1400 afs_check_call_state(struct afs_call * call,enum afs_call_state state)1401 static inline bool afs_check_call_state(struct afs_call *call, 1402 enum afs_call_state state) 1403 { 1404 return READ_ONCE(call->state) == state; 1405 } 1406 afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1407 static inline bool afs_set_call_state(struct afs_call *call, 1408 enum afs_call_state from, 1409 enum afs_call_state to) 1410 { 1411 bool ok = false; 1412 1413 spin_lock_bh(&call->state_lock); 1414 if (call->state == from) { 1415 call->state = to; 1416 trace_afs_call_state(call, from, to, 0, 0); 1417 ok = true; 1418 } 1419 spin_unlock_bh(&call->state_lock); 1420 return ok; 1421 } 1422 afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1423 static inline void afs_set_call_complete(struct afs_call *call, 1424 int error, u32 remote_abort) 1425 { 1426 enum afs_call_state state; 1427 bool ok = false; 1428 1429 spin_lock_bh(&call->state_lock); 1430 state = call->state; 1431 if (state != AFS_CALL_COMPLETE) { 1432 call->abort_code = remote_abort; 1433 call->error = error; 1434 call->state = AFS_CALL_COMPLETE; 1435 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1436 error, remote_abort); 1437 ok = true; 1438 } 1439 spin_unlock_bh(&call->state_lock); 1440 if (ok) { 1441 trace_afs_call_done(call); 1442 1443 /* Asynchronous calls have two refs to release - one from the alloc and 1444 * one queued with the work item - and we can't just deallocate the 1445 * call because the work item may be queued again. 1446 */ 1447 if (call->drop_ref) 1448 afs_put_call(call); 1449 } 1450 } 1451 1452 /* 1453 * security.c 1454 */ 1455 extern void afs_put_permits(struct afs_permits *); 1456 extern void afs_clear_permits(struct afs_vnode *); 1457 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1458 struct afs_status_cb *); 1459 extern struct key *afs_request_key(struct afs_cell *); 1460 extern struct key *afs_request_key_rcu(struct afs_cell *); 1461 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1462 extern int afs_permission(struct mnt_idmap *, struct inode *, int); 1463 extern void __exit afs_clean_up_permit_cache(void); 1464 1465 /* 1466 * server.c 1467 */ 1468 extern spinlock_t afs_server_peer_lock; 1469 1470 extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *); 1471 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1472 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1473 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1474 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace); 1475 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1476 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace); 1477 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1478 extern void afs_manage_servers(struct work_struct *); 1479 extern void afs_servers_timer(struct timer_list *); 1480 extern void afs_fs_probe_timer(struct timer_list *); 1481 extern void __net_exit afs_purge_servers(struct afs_net *); 1482 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key); 1483 afs_inc_servers_outstanding(struct afs_net * net)1484 static inline void afs_inc_servers_outstanding(struct afs_net *net) 1485 { 1486 atomic_inc(&net->servers_outstanding); 1487 } 1488 afs_dec_servers_outstanding(struct afs_net * net)1489 static inline void afs_dec_servers_outstanding(struct afs_net *net) 1490 { 1491 if (atomic_dec_and_test(&net->servers_outstanding)) 1492 wake_up_var(&net->servers_outstanding); 1493 } 1494 afs_is_probing_server(struct afs_server * server)1495 static inline bool afs_is_probing_server(struct afs_server *server) 1496 { 1497 return list_empty(&server->probe_link); 1498 } 1499 1500 /* 1501 * server_list.c 1502 */ afs_get_serverlist(struct afs_server_list * slist)1503 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1504 { 1505 refcount_inc(&slist->usage); 1506 return slist; 1507 } 1508 1509 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1510 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume, 1511 struct key *key, 1512 struct afs_vldb_entry *vldb); 1513 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1514 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist); 1515 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist, 1516 struct afs_server_list *old); 1517 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist); 1518 1519 /* 1520 * super.c 1521 */ 1522 extern int __init afs_fs_init(void); 1523 extern void afs_fs_exit(void); 1524 1525 /* 1526 * validation.c 1527 */ 1528 bool afs_check_validity(const struct afs_vnode *vnode); 1529 int afs_update_volume_state(struct afs_operation *op); 1530 int afs_validate(struct afs_vnode *vnode, struct key *key); 1531 1532 /* 1533 * vlclient.c 1534 */ 1535 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1536 const char *, int); 1537 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1538 struct afs_call *afs_vl_get_capabilities(struct afs_net *net, 1539 struct afs_addr_list *alist, 1540 unsigned int addr_index, 1541 struct key *key, 1542 struct afs_vlserver *server, 1543 unsigned int server_index); 1544 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1545 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1546 1547 /* 1548 * vl_alias.c 1549 */ 1550 extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1551 1552 /* 1553 * vl_probe.c 1554 */ 1555 extern void afs_vlserver_probe_result(struct afs_call *); 1556 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1557 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1558 1559 /* 1560 * vl_rotate.c 1561 */ 1562 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1563 struct afs_cell *, struct key *); 1564 extern bool afs_select_vlserver(struct afs_vl_cursor *); 1565 extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1566 extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1567 1568 /* 1569 * vlserver_list.c 1570 */ afs_get_vlserver(struct afs_vlserver * vlserver)1571 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1572 { 1573 refcount_inc(&vlserver->ref); 1574 return vlserver; 1575 } 1576 afs_get_vlserverlist(struct afs_vlserver_list * vllist)1577 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1578 { 1579 if (vllist) 1580 refcount_inc(&vllist->ref); 1581 return vllist; 1582 } 1583 1584 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1585 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1586 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1587 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1588 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1589 const void *, size_t); 1590 1591 /* 1592 * volume.c 1593 */ 1594 extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1595 extern int afs_activate_volume(struct afs_volume *); 1596 extern void afs_deactivate_volume(struct afs_volume *); 1597 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1598 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1599 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1600 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1601 1602 /* 1603 * write.c 1604 */ 1605 void afs_prepare_write(struct netfs_io_subrequest *subreq); 1606 void afs_issue_write(struct netfs_io_subrequest *subreq); 1607 void afs_begin_writeback(struct netfs_io_request *wreq); 1608 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream); 1609 extern int afs_writepages(struct address_space *, struct writeback_control *); 1610 extern int afs_fsync(struct file *, loff_t, loff_t, int); 1611 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1612 extern void afs_prune_wb_keys(struct afs_vnode *); 1613 1614 /* 1615 * xattr.c 1616 */ 1617 extern const struct xattr_handler * const afs_xattr_handlers[]; 1618 1619 /* 1620 * yfsclient.c 1621 */ 1622 extern void yfs_fs_fetch_data(struct afs_operation *); 1623 extern void yfs_fs_create_file(struct afs_operation *); 1624 extern void yfs_fs_make_dir(struct afs_operation *); 1625 extern void yfs_fs_remove_file2(struct afs_operation *); 1626 extern void yfs_fs_remove_file(struct afs_operation *); 1627 extern void yfs_fs_remove_dir(struct afs_operation *); 1628 extern void yfs_fs_link(struct afs_operation *); 1629 extern void yfs_fs_symlink(struct afs_operation *); 1630 extern void yfs_fs_rename(struct afs_operation *); 1631 extern void yfs_fs_store_data(struct afs_operation *); 1632 extern void yfs_fs_setattr(struct afs_operation *); 1633 extern void yfs_fs_get_volume_status(struct afs_operation *); 1634 extern void yfs_fs_set_lock(struct afs_operation *); 1635 extern void yfs_fs_extend_lock(struct afs_operation *); 1636 extern void yfs_fs_release_lock(struct afs_operation *); 1637 extern void yfs_fs_fetch_status(struct afs_operation *); 1638 extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1639 1640 struct yfs_acl { 1641 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1642 struct afs_acl *vol_acl; /* Whole volume ACL */ 1643 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1644 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1645 unsigned int flags; 1646 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1647 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1648 }; 1649 1650 extern void yfs_free_opaque_acl(struct yfs_acl *); 1651 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1652 extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1653 1654 /* 1655 * Miscellaneous inline functions. 1656 */ AFS_FS_I(struct inode * inode)1657 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1658 { 1659 return container_of(inode, struct afs_vnode, netfs.inode); 1660 } 1661 AFS_VNODE_TO_I(struct afs_vnode * vnode)1662 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1663 { 1664 return &vnode->netfs.inode; 1665 } 1666 1667 /* 1668 * Note that a dentry got changed. We need to set d_fsdata to the data version 1669 * number derived from the result of the operation. It doesn't matter if 1670 * d_fsdata goes backwards as we'll just revalidate. 1671 */ afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1672 static inline void afs_update_dentry_version(struct afs_operation *op, 1673 struct afs_vnode_param *dir_vp, 1674 struct dentry *dentry) 1675 { 1676 if (!op->cumul_error.error) 1677 dentry->d_fsdata = 1678 (void *)(unsigned long)dir_vp->scb.status.data_version; 1679 } 1680 1681 /* 1682 * Set the file size and block count. Estimate the number of 512 bytes blocks 1683 * used, rounded up to nearest 1K for consistency with other AFS clients. 1684 */ afs_set_i_size(struct afs_vnode * vnode,u64 size)1685 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size) 1686 { 1687 i_size_write(&vnode->netfs.inode, size); 1688 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1; 1689 } 1690 1691 /* 1692 * Check for a conflicting operation on a directory that we just unlinked from. 1693 * If someone managed to sneak a link or an unlink in on the file we just 1694 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS). 1695 */ afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1696 static inline void afs_check_dir_conflict(struct afs_operation *op, 1697 struct afs_vnode_param *dvp) 1698 { 1699 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version) 1700 op->flags |= AFS_OPERATION_DIR_CONFLICT; 1701 } 1702 afs_io_error(struct afs_call * call,enum afs_io_error where)1703 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1704 { 1705 trace_afs_io_error(call->debug_id, -EIO, where); 1706 return -EIO; 1707 } 1708 afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1709 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1710 { 1711 trace_afs_file_error(vnode, -EIO, where); 1712 return -EIO; 1713 } 1714 1715 /*****************************************************************************/ 1716 /* 1717 * debug tracing 1718 */ 1719 extern unsigned afs_debug; 1720 1721 #define dbgprintk(FMT,...) \ 1722 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1723 1724 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1725 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1726 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1727 1728 1729 #if defined(__KDEBUG) 1730 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1731 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1732 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1733 1734 #elif defined(CONFIG_AFS_DEBUG) 1735 #define AFS_DEBUG_KENTER 0x01 1736 #define AFS_DEBUG_KLEAVE 0x02 1737 #define AFS_DEBUG_KDEBUG 0x04 1738 1739 #define _enter(FMT,...) \ 1740 do { \ 1741 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1742 kenter(FMT,##__VA_ARGS__); \ 1743 } while (0) 1744 1745 #define _leave(FMT,...) \ 1746 do { \ 1747 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1748 kleave(FMT,##__VA_ARGS__); \ 1749 } while (0) 1750 1751 #define _debug(FMT,...) \ 1752 do { \ 1753 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1754 kdebug(FMT,##__VA_ARGS__); \ 1755 } while (0) 1756 1757 #else 1758 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1759 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1760 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1761 #endif 1762 1763 /* 1764 * debug assertion checking 1765 */ 1766 #if 1 // defined(__KDEBUGALL) 1767 1768 #define ASSERT(X) \ 1769 do { \ 1770 if (unlikely(!(X))) { \ 1771 printk(KERN_ERR "\n"); \ 1772 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1773 BUG(); \ 1774 } \ 1775 } while(0) 1776 1777 #define ASSERTCMP(X, OP, Y) \ 1778 do { \ 1779 if (unlikely(!((X) OP (Y)))) { \ 1780 printk(KERN_ERR "\n"); \ 1781 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1782 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1783 (unsigned long)(X), (unsigned long)(Y)); \ 1784 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1785 (unsigned long)(X), (unsigned long)(Y)); \ 1786 BUG(); \ 1787 } \ 1788 } while(0) 1789 1790 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1791 do { \ 1792 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1793 printk(KERN_ERR "\n"); \ 1794 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1795 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1796 (unsigned long)(L), (unsigned long)(N), \ 1797 (unsigned long)(H)); \ 1798 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1799 (unsigned long)(L), (unsigned long)(N), \ 1800 (unsigned long)(H)); \ 1801 BUG(); \ 1802 } \ 1803 } while(0) 1804 1805 #define ASSERTIF(C, X) \ 1806 do { \ 1807 if (unlikely((C) && !(X))) { \ 1808 printk(KERN_ERR "\n"); \ 1809 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1810 BUG(); \ 1811 } \ 1812 } while(0) 1813 1814 #define ASSERTIFCMP(C, X, OP, Y) \ 1815 do { \ 1816 if (unlikely((C) && !((X) OP (Y)))) { \ 1817 printk(KERN_ERR "\n"); \ 1818 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1819 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1820 (unsigned long)(X), (unsigned long)(Y)); \ 1821 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1822 (unsigned long)(X), (unsigned long)(Y)); \ 1823 BUG(); \ 1824 } \ 1825 } while(0) 1826 1827 #else 1828 1829 #define ASSERT(X) \ 1830 do { \ 1831 } while(0) 1832 1833 #define ASSERTCMP(X, OP, Y) \ 1834 do { \ 1835 } while(0) 1836 1837 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 1838 do { \ 1839 } while(0) 1840 1841 #define ASSERTIF(C, X) \ 1842 do { \ 1843 } while(0) 1844 1845 #define ASSERTIFCMP(C, X, OP, Y) \ 1846 do { \ 1847 } while(0) 1848 1849 #endif /* __KDEBUGALL */ 1850