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 33struct pagevec; 34struct afs_call; 35struct afs_vnode; 36struct 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 */ 42enum 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 50struct 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 65enum 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 */ 79struct 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 89struct 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 98struct 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 */ 107struct 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 */ 128struct 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 191struct 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 */ 213struct 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 */ 222struct 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 227static 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 */ 237struct 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 */ 260struct 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 268static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 269{ 270 return sb->s_fs_info; 271} 272 273extern struct file_system_type afs_fs_type; 274 275/* 276 * Set of substitutes for @sys. 277 */ 278struct 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 */ 289struct 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_addresses; /* afs_server (by lowest IPv6 addr) */ 325 seqlock_t fs_addr_lock; /* For fs_addresses[46] */ 326 327 struct work_struct fs_manager; 328 struct timer_list fs_timer; 329 330 struct work_struct fs_prober; 331 struct timer_list fs_probe_timer; 332 atomic_t servers_outstanding; 333 334 /* File locking renewal management */ 335 struct mutex lock_manager_mutex; 336 337 /* Misc */ 338 struct super_block *dynroot_sb; /* Dynamic root mount superblock */ 339 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */ 340 struct afs_sysnames *sysnames; 341 rwlock_t sysnames_lock; 342 struct afs_addr_preference_list __rcu *address_prefs; 343 u16 address_pref_version; 344 345 /* Statistics counters */ 346 atomic_t n_lookup; /* Number of lookups done */ 347 atomic_t n_reval; /* Number of dentries needing revalidation */ 348 atomic_t n_inval; /* Number of invalidations by the server */ 349 atomic_t n_relpg; /* Number of invalidations by release_folio */ 350 atomic_t n_read_dir; /* Number of directory pages read */ 351 atomic_t n_dir_cr; /* Number of directory entry creation edits */ 352 atomic_t n_dir_rm; /* Number of directory entry removal edits */ 353 atomic_t n_stores; /* Number of store ops */ 354 atomic_long_t n_store_bytes; /* Number of bytes stored */ 355 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */ 356 atomic_t n_fetches; /* Number of data fetch ops */ 357}; 358 359extern const char afs_init_sysname[]; 360 361enum afs_cell_state { 362 AFS_CELL_UNSET, 363 AFS_CELL_ACTIVATING, 364 AFS_CELL_ACTIVE, 365 AFS_CELL_DEACTIVATING, 366 AFS_CELL_INACTIVE, 367 AFS_CELL_FAILED, 368 AFS_CELL_REMOVED, 369}; 370 371/* 372 * AFS cell record. 373 * 374 * This is a tricky concept to get right as it is possible to create aliases 375 * simply by pointing AFSDB/SRV records for two names at the same set of VL 376 * servers; it is also possible to do things like setting up two sets of VL 377 * servers, one of which provides a superset of the volumes provided by the 378 * other (for internal/external division, for example). 379 * 380 * Cells only exist in the sense that (a) a cell's name maps to a set of VL 381 * servers and (b) a cell's name is used by the client to select the key to use 382 * for authentication and encryption. The cell name is not typically used in 383 * the protocol. 384 * 385 * Two cells are determined to be aliases if they have an explicit alias (YFS 386 * only), share any VL servers in common or have at least one volume in common. 387 * "In common" means that the address list of the VL servers or the fileservers 388 * share at least one endpoint. 389 */ 390struct afs_cell { 391 union { 392 struct rcu_head rcu; 393 struct rb_node net_node; /* Node in net->cells */ 394 }; 395 struct afs_net *net; 396 struct afs_cell *alias_of; /* The cell this is an alias of */ 397 struct afs_volume *root_volume; /* The root.cell volume if there is one */ 398 struct key *anonymous_key; /* anonymous user key for this cell */ 399 struct work_struct manager; /* Manager for init/deinit/dns */ 400 struct hlist_node proc_link; /* /proc cell list link */ 401 time64_t dns_expiry; /* Time AFSDB/SRV record expires */ 402 time64_t last_inactive; /* Time of last drop of usage count */ 403 refcount_t ref; /* Struct refcount */ 404 atomic_t active; /* Active usage counter */ 405 unsigned long flags; 406#define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */ 407#define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */ 408#define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */ 409 enum afs_cell_state state; 410 short error; 411 enum dns_record_source dns_source:8; /* Latest source of data from lookup */ 412 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */ 413 unsigned int dns_lookup_count; /* Counter of DNS lookups */ 414 unsigned int debug_id; 415 416 /* The volumes belonging to this cell */ 417 struct rw_semaphore vs_lock; /* Lock for server->volumes */ 418 struct rb_root volumes; /* Tree of volumes on this server */ 419 struct hlist_head proc_volumes; /* procfs volume list */ 420 seqlock_t volume_lock; /* For volumes */ 421 422 /* Active fileserver interaction state. */ 423 struct rb_root fs_servers; /* afs_server (by server UUID) */ 424 seqlock_t fs_lock; /* For fs_servers */ 425 426 /* VL server list. */ 427 rwlock_t vl_servers_lock; /* Lock on vl_servers */ 428 struct afs_vlserver_list __rcu *vl_servers; 429 430 u8 name_len; /* Length of name */ 431 char *name; /* Cell name, case-flattened and NUL-padded */ 432}; 433 434/* 435 * Volume Location server record. 436 */ 437struct afs_vlserver { 438 struct rcu_head rcu; 439 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */ 440 unsigned long flags; 441#define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */ 442#define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */ 443#define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */ 444#define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */ 445 rwlock_t lock; /* Lock on addresses */ 446 refcount_t ref; 447 unsigned int rtt; /* Server's current RTT in uS */ 448 unsigned int debug_id; 449 450 /* Probe state */ 451 wait_queue_head_t probe_wq; 452 atomic_t probe_outstanding; 453 spinlock_t probe_lock; 454 struct { 455 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */ 456 u32 abort_code; 457 short error; 458 unsigned short flags; 459#define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */ 460#define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */ 461#define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */ 462#define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */ 463 } probe; 464 465 u16 service_id; /* Service ID we're using */ 466 u16 port; 467 u16 name_len; /* Length of name */ 468 char name[]; /* Server name, case-flattened */ 469}; 470 471/* 472 * Weighted list of Volume Location servers. 473 */ 474struct afs_vlserver_entry { 475 u16 priority; /* Preference (as SRV) */ 476 u16 weight; /* Weight (as SRV) */ 477 enum dns_record_source source:8; 478 enum dns_lookup_status status:8; 479 struct afs_vlserver *server; 480}; 481 482struct afs_vlserver_list { 483 struct rcu_head rcu; 484 refcount_t ref; 485 u8 nr_servers; 486 u8 index; /* Server currently in use */ 487 u8 preferred; /* Preferred server */ 488 enum dns_record_source source:8; 489 enum dns_lookup_status status:8; 490 rwlock_t lock; 491 struct afs_vlserver_entry servers[]; 492}; 493 494/* 495 * Cached VLDB entry. 496 * 497 * This is pointed to by cell->vldb_entries, indexed by name. 498 */ 499struct afs_vldb_entry { 500 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */ 501 502 unsigned long flags; 503#define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */ 504#define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */ 505#define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */ 506#define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */ 507#define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */ 508 509 uuid_t fs_server[AFS_NMAXNSERVERS]; 510 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */ 511 u8 fs_mask[AFS_NMAXNSERVERS]; 512#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 513#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 514#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 515 u8 vlsf_flags[AFS_NMAXNSERVERS]; 516 short error; 517 u8 nr_servers; /* Number of server records */ 518 u8 name_len; 519 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 520}; 521 522/* 523 * Fileserver endpoint state. The records the addresses of a fileserver's 524 * endpoints and the state and result of a round of probing on them. This 525 * allows the rotation algorithm to access those results without them being 526 * erased by a subsequent round of probing. 527 */ 528struct afs_endpoint_state { 529 struct rcu_head rcu; 530 struct afs_addr_list *addresses; /* The addresses being probed */ 531 unsigned long responsive_set; /* Bitset of responsive endpoints */ 532 unsigned long failed_set; /* Bitset of endpoints we failed to probe */ 533 refcount_t ref; 534 unsigned int server_id; /* Debug ID of server */ 535 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */ 536 atomic_t nr_probing; /* Number of outstanding probes */ 537 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */ 538 s32 abort_code; 539 short error; 540 unsigned long flags; 541#define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */ 542#define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */ 543#define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */ 544#define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */ 545#define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */ 546}; 547 548/* 549 * Record of fileserver with which we're actively communicating. 550 */ 551struct afs_server { 552 struct rcu_head rcu; 553 union { 554 uuid_t uuid; /* Server ID */ 555 struct afs_uuid _uuid; 556 }; 557 558 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 559 struct rb_node uuid_rb; /* Link in net->fs_servers */ 560 struct afs_server __rcu *uuid_next; /* Next server with same UUID */ 561 struct afs_server *uuid_prev; /* Previous server with same UUID */ 562 struct list_head probe_link; /* Link in net->fs_probe_list */ 563 struct hlist_node addr_link; /* Link in net->fs_addresses6 */ 564 struct hlist_node proc_link; /* Link in net->fs_proc */ 565 struct list_head volumes; /* RCU list of afs_server_entry objects */ 566 struct afs_server *gc_next; /* Next server in manager's list */ 567 time64_t unuse_time; /* Time at which last unused */ 568 unsigned long flags; 569#define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */ 570#define AFS_SERVER_FL_UPDATING 1 571#define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */ 572#define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */ 573#define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */ 574#define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */ 575#define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */ 576#define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */ 577#define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */ 578#define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */ 579#define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */ 580 refcount_t ref; /* Object refcount */ 581 atomic_t active; /* Active user count */ 582 u32 addr_version; /* Address list version */ 583 u16 service_id; /* Service ID we're using. */ 584 unsigned int rtt; /* Server's current RTT in uS */ 585 unsigned int debug_id; /* Debugging ID for traces */ 586 587 /* file service access */ 588 rwlock_t fs_lock; /* access lock */ 589 590 /* Probe state */ 591 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */ 592 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */ 593 wait_queue_head_t probe_wq; 594 unsigned int probe_counter; /* Number of probes issued */ 595 spinlock_t probe_lock; 596}; 597 598enum afs_ro_replicating { 599 AFS_RO_NOT_REPLICATING, /* Not doing replication */ 600 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */ 601 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */ 602} __mode(byte); 603 604/* 605 * Replaceable volume server list. 606 */ 607struct afs_server_entry { 608 struct afs_server *server; 609 struct afs_volume *volume; 610 struct list_head slink; /* Link in server->volumes */ 611 time64_t cb_expires_at; /* Time at which volume-level callback expires */ 612 unsigned long flags; 613#define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */ 614#define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */ 615#define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */ 616}; 617 618struct afs_server_list { 619 struct rcu_head rcu; 620 refcount_t usage; 621 bool attached; /* T if attached to servers */ 622 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */ 623 unsigned char nr_servers; 624 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */ 625 unsigned int seq; /* Set to ->servers_seq when installed */ 626 rwlock_t lock; 627 struct afs_server_entry servers[]; 628}; 629 630/* 631 * Live AFS volume management. 632 */ 633struct afs_volume { 634 struct rcu_head rcu; 635 afs_volid_t vid; /* The volume ID of this volume */ 636 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */ 637 refcount_t ref; 638 time64_t update_at; /* Time at which to next update */ 639 struct afs_cell *cell; /* Cell to which belongs (pins ref) */ 640 struct rb_node cell_node; /* Link in cell->volumes */ 641 struct hlist_node proc_link; /* Link in cell->proc_volumes */ 642 struct super_block __rcu *sb; /* Superblock on which inodes reside */ 643 struct work_struct destructor; /* Deferred destructor */ 644 unsigned long flags; 645#define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */ 646#define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */ 647#define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */ 648#define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */ 649#define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */ 650#define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */ 651#ifdef CONFIG_AFS_FSCACHE 652 struct fscache_volume *cache; /* Caching cookie */ 653#endif 654 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */ 655 rwlock_t servers_lock; /* Lock for ->servers */ 656 unsigned int servers_seq; /* Incremented each time ->servers changes */ 657 658 /* RO release tracking */ 659 struct mutex volsync_lock; /* Time/state evaluation lock */ 660 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */ 661 time64_t update_time; /* Volume update time (or TIME64_MIN) */ 662 663 /* Callback management */ 664 struct mutex cb_check_lock; /* Lock to control race to check after v_break */ 665 time64_t cb_expires_at; /* Earliest volume callback expiry time */ 666 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */ 667 atomic_t cb_v_break; /* Volume-break event counter. */ 668 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */ 669 atomic_t cb_scrub; /* Scrub-all-data event counter. */ 670 rwlock_t cb_v_break_lock; 671 struct rw_semaphore open_mmaps_lock; 672 struct list_head open_mmaps; /* List of vnodes that are mmapped */ 673 674 afs_voltype_t type; /* type of volume */ 675 char type_force; /* force volume type (suppress R/O -> R/W) */ 676 u8 name_len; 677 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */ 678}; 679 680enum afs_lock_state { 681 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */ 682 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */ 683 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */ 684 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */ 685 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */ 686 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */ 687 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */ 688 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */ 689}; 690 691/* 692 * AFS inode private data. 693 * 694 * Note that afs_alloc_inode() *must* reset anything that could incorrectly 695 * leak from one inode to another. 696 */ 697struct afs_vnode { 698 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 699 struct afs_volume *volume; /* volume on which vnode resides */ 700 struct afs_fid fid; /* the file identifier for this inode */ 701 struct afs_file_status status; /* AFS status info for this file */ 702 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */ 703 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */ 704 struct mutex io_lock; /* Lock for serialising I/O on this mutex */ 705 struct rw_semaphore validate_lock; /* lock for validating this vnode */ 706 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */ 707 struct key *silly_key; /* Silly rename key */ 708 spinlock_t wb_lock; /* lock for wb_keys */ 709 spinlock_t lock; /* waitqueue/flags lock */ 710 unsigned long flags; 711#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 712#define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */ 713#define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 714#define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 715#define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 716#define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */ 717#define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */ 718#define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */ 719#define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */ 720#define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */ 721 722 struct list_head wb_keys; /* List of keys available for writeback */ 723 struct list_head pending_locks; /* locks waiting to be granted */ 724 struct list_head granted_locks; /* locks granted on this file */ 725 struct delayed_work lock_work; /* work to be done in locking */ 726 struct key *lock_key; /* Key to be used in lock ops */ 727 ktime_t locked_at; /* Time at which lock obtained */ 728 enum afs_lock_state lock_state : 8; 729 afs_lock_type_t lock_type : 8; 730 731 /* outstanding callback notification on this file */ 732 struct work_struct cb_work; /* Work for mmap'd files */ 733 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */ 734 void *cb_server; /* Server with callback/filelock */ 735 atomic_t cb_nr_mmap; /* Number of mmaps */ 736 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */ 737 unsigned int cb_scrub; /* Scrub counter on ->volume */ 738 unsigned int cb_break; /* Break counter on vnode */ 739 unsigned int cb_v_check; /* Break check counter on ->volume */ 740 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */ 741 742 atomic64_t cb_expires_at; /* time at which callback expires */ 743#define AFS_NO_CB_PROMISE TIME64_MIN 744}; 745 746static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode) 747{ 748#ifdef CONFIG_AFS_FSCACHE 749 return netfs_i_cookie(&vnode->netfs); 750#else 751 return NULL; 752#endif 753} 754 755static inline void afs_vnode_set_cache(struct afs_vnode *vnode, 756 struct fscache_cookie *cookie) 757{ 758#ifdef CONFIG_AFS_FSCACHE 759 vnode->netfs.cache = cookie; 760 if (cookie) 761 mapping_set_release_always(vnode->netfs.inode.i_mapping); 762#endif 763} 764 765/* 766 * cached security record for one user's attempt to access a vnode 767 */ 768struct afs_permit { 769 struct key *key; /* RxRPC ticket holding a security context */ 770 afs_access_t access; /* CallerAccess value for this key */ 771}; 772 773/* 774 * Immutable cache of CallerAccess records from attempts to access vnodes. 775 * These may be shared between multiple vnodes. 776 */ 777struct afs_permits { 778 struct rcu_head rcu; 779 struct hlist_node hash_node; /* Link in hash */ 780 unsigned long h; /* Hash value for this permit list */ 781 refcount_t usage; 782 unsigned short nr_permits; /* Number of records */ 783 bool invalidated; /* Invalidated due to key change */ 784 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */ 785}; 786 787/* 788 * Error prioritisation and accumulation. 789 */ 790struct afs_error { 791 s32 abort_code; /* Cumulative abort code */ 792 short error; /* Cumulative error */ 793 bool responded; /* T if server responded */ 794 bool aborted; /* T if ->error is from an abort */ 795}; 796 797/* 798 * Cursor for iterating over a set of volume location servers. 799 */ 800struct afs_vl_cursor { 801 struct afs_cell *cell; /* The cell we're querying */ 802 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */ 803 struct afs_vlserver *server; /* Server on which this resides */ 804 struct afs_addr_list *alist; /* Current address list (pins ref) */ 805 struct key *key; /* Key for the server */ 806 unsigned long untried_servers; /* Bitmask of untried servers */ 807 unsigned long addr_tried; /* Tried addresses */ 808 struct afs_error cumul_error; /* Cumulative error */ 809 unsigned int debug_id; 810 s32 call_abort_code; 811 short call_error; /* Error from single call */ 812 short server_index; /* Current server */ 813 signed char addr_index; /* Current address */ 814 unsigned short flags; 815#define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */ 816#define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */ 817#define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */ 818 short nr_iterations; /* Number of server iterations */ 819 bool call_responded; /* T if the current address responded */ 820}; 821 822/* 823 * Fileserver state tracking for an operation. An array of these is kept, 824 * indexed by server index. 825 */ 826struct afs_server_state { 827 /* Tracking of fileserver probe state. Other operations may interfere 828 * by probing a fileserver when accessing other volumes. 829 */ 830 unsigned int probe_seq; 831 unsigned long untried_addrs; /* Addresses we haven't tried yet */ 832 struct wait_queue_entry probe_waiter; 833 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */ 834}; 835 836/* 837 * Fileserver operation methods. 838 */ 839struct afs_operation_ops { 840 void (*issue_afs_rpc)(struct afs_operation *op); 841 void (*issue_yfs_rpc)(struct afs_operation *op); 842 void (*success)(struct afs_operation *op); 843 void (*aborted)(struct afs_operation *op); 844 void (*failed)(struct afs_operation *op); 845 void (*edit_dir)(struct afs_operation *op); 846 void (*put)(struct afs_operation *op); 847}; 848 849struct afs_vnode_param { 850 struct afs_vnode *vnode; 851 struct afs_fid fid; /* Fid to access */ 852 struct afs_status_cb scb; /* Returned status and callback promise */ 853 afs_dataversion_t dv_before; /* Data version before the call */ 854 unsigned int cb_break_before; /* cb_break before the call */ 855 u8 dv_delta; /* Expected change in data version */ 856 bool put_vnode:1; /* T if we have a ref on the vnode */ 857 bool need_io_lock:1; /* T if we need the I/O lock on this */ 858 bool update_ctime:1; /* Need to update the ctime */ 859 bool set_size:1; /* Must update i_size */ 860 bool op_unlinked:1; /* True if file was unlinked by op */ 861 bool speculative:1; /* T if speculative status fetch (no vnode lock) */ 862 bool modification:1; /* Set if the content gets modified */ 863}; 864 865/* 866 * Fileserver operation wrapper, handling server and address rotation 867 * asynchronously. May make simultaneous calls to multiple servers. 868 */ 869struct afs_operation { 870 struct afs_net *net; /* Network namespace */ 871 struct key *key; /* Key for the cell */ 872 const struct afs_call_type *type; /* Type of call done */ 873 const struct afs_operation_ops *ops; 874 875 /* Parameters/results for the operation */ 876 struct afs_volume *volume; /* Volume being accessed */ 877 struct afs_vnode_param file[2]; 878 struct afs_vnode_param *more_files; 879 struct afs_volsync pre_volsync; /* Volsync before op */ 880 struct afs_volsync volsync; /* Volsync returned by op */ 881 struct dentry *dentry; /* Dentry to be altered */ 882 struct dentry *dentry_2; /* Second dentry to be altered */ 883 struct timespec64 mtime; /* Modification time to record */ 884 struct timespec64 ctime; /* Change time to set */ 885 struct afs_error cumul_error; /* Cumulative error */ 886 short nr_files; /* Number of entries in file[], more_files */ 887 unsigned int debug_id; 888 889 unsigned int cb_v_break; /* Volume break counter before op */ 890 891 union { 892 struct { 893 int which; /* Which ->file[] to fetch for */ 894 } fetch_status; 895 struct { 896 int reason; /* enum afs_edit_dir_reason */ 897 mode_t mode; 898 const char *symlink; 899 } create; 900 struct { 901 bool need_rehash; 902 } unlink; 903 struct { 904 struct dentry *rehash; 905 struct dentry *tmp; 906 bool new_negative; 907 } rename; 908 struct { 909 struct afs_read *req; 910 } fetch; 911 struct { 912 afs_lock_type_t type; 913 } lock; 914 struct { 915 struct iov_iter *write_iter; 916 loff_t pos; 917 loff_t size; 918 loff_t i_size; 919 bool laundering; /* Laundering page, PG_writeback not set */ 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 */ 967struct afs_vnode_cache_aux { 968 __be64 data_version; 969} __packed; 970 971static 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 977static 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 */ 992struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 993extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr); 994extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason); 995extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *, 996 const char *, size_t, char, 997 unsigned short, unsigned short); 998bool afs_addr_list_same(const struct afs_addr_list *a, 999 const struct afs_addr_list *b); 1000extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *); 1001 1002extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr, 1003 __be32 xdr, u16 port); 1004extern 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 */ 1010int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size); 1011void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist); 1012void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist); 1013 1014/* 1015 * callback.c 1016 */ 1017extern void afs_invalidate_mmap_work(struct work_struct *); 1018extern void afs_init_callback_state(struct afs_server *); 1019extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1020extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason); 1021extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *); 1022 1023static 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 1028static 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 */ 1039extern int afs_cell_init(struct afs_net *, const char *); 1040extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned, 1041 enum afs_cell_trace); 1042extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned, 1043 const char *, bool); 1044extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace); 1045extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace); 1046extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace); 1047extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace); 1048extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace); 1049extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace); 1050extern void afs_manage_cells(struct work_struct *); 1051extern void afs_cells_timer(struct timer_list *); 1052extern void __net_exit afs_cell_purge(struct afs_net *); 1053 1054/* 1055 * cmservice.c 1056 */ 1057extern bool afs_cm_incoming_call(struct afs_call *); 1058 1059/* 1060 * dir.c 1061 */ 1062extern const struct file_operations afs_dir_file_operations; 1063extern const struct inode_operations afs_dir_inode_operations; 1064extern const struct address_space_operations afs_dir_aops; 1065extern const struct dentry_operations afs_fs_dentry_operations; 1066 1067extern void afs_d_release(struct dentry *); 1068extern void afs_check_for_remote_deletion(struct afs_operation *); 1069 1070/* 1071 * dir_edit.c 1072 */ 1073extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *, 1074 enum afs_edit_dir_reason); 1075extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason); 1076 1077/* 1078 * dir_silly.c 1079 */ 1080extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *, 1081 struct dentry *, struct key *); 1082extern int afs_silly_iput(struct dentry *, struct inode *); 1083 1084/* 1085 * dynroot.c 1086 */ 1087extern const struct inode_operations afs_dynroot_inode_operations; 1088extern const struct dentry_operations afs_dynroot_dentry_operations; 1089 1090extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *); 1091extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *); 1092extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *); 1093extern int afs_dynroot_populate(struct super_block *); 1094extern void afs_dynroot_depopulate(struct super_block *); 1095 1096/* 1097 * file.c 1098 */ 1099extern const struct address_space_operations afs_file_aops; 1100extern const struct address_space_operations afs_symlink_aops; 1101extern const struct inode_operations afs_file_inode_operations; 1102extern const struct file_operations afs_file_operations; 1103extern const struct netfs_request_ops afs_req_ops; 1104 1105extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *); 1106extern void afs_put_wb_key(struct afs_wb_key *); 1107extern int afs_open(struct inode *, struct file *); 1108extern int afs_release(struct inode *, struct file *); 1109extern int afs_fetch_data(struct afs_vnode *, struct afs_read *); 1110extern struct afs_read *afs_alloc_read(gfp_t); 1111extern void afs_put_read(struct afs_read *); 1112 1113static inline struct afs_read *afs_get_read(struct afs_read *req) 1114{ 1115 refcount_inc(&req->usage); 1116 return req; 1117} 1118 1119/* 1120 * flock.c 1121 */ 1122extern struct workqueue_struct *afs_lock_manager; 1123 1124extern void afs_lock_op_done(struct afs_call *); 1125extern void afs_lock_work(struct work_struct *); 1126extern void afs_lock_may_be_available(struct afs_vnode *); 1127extern int afs_lock(struct file *, int, struct file_lock *); 1128extern int afs_flock(struct file *, int, struct file_lock *); 1129 1130/* 1131 * fsclient.c 1132 */ 1133extern void afs_fs_fetch_status(struct afs_operation *); 1134extern void afs_fs_fetch_data(struct afs_operation *); 1135extern void afs_fs_create_file(struct afs_operation *); 1136extern void afs_fs_make_dir(struct afs_operation *); 1137extern void afs_fs_remove_file(struct afs_operation *); 1138extern void afs_fs_remove_dir(struct afs_operation *); 1139extern void afs_fs_link(struct afs_operation *); 1140extern void afs_fs_symlink(struct afs_operation *); 1141extern void afs_fs_rename(struct afs_operation *); 1142extern void afs_fs_store_data(struct afs_operation *); 1143extern void afs_fs_setattr(struct afs_operation *); 1144extern void afs_fs_get_volume_status(struct afs_operation *); 1145extern void afs_fs_set_lock(struct afs_operation *); 1146extern void afs_fs_extend_lock(struct afs_operation *); 1147extern void afs_fs_release_lock(struct afs_operation *); 1148int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server, 1149 struct afs_address *addr, struct key *key); 1150bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server, 1151 struct afs_endpoint_state *estate, unsigned int addr_index, 1152 struct key *key); 1153extern void afs_fs_inline_bulk_status(struct afs_operation *); 1154 1155struct afs_acl { 1156 u32 size; 1157 u8 data[] __counted_by(size); 1158}; 1159 1160extern void afs_fs_fetch_acl(struct afs_operation *); 1161extern void afs_fs_store_acl(struct afs_operation *); 1162 1163/* 1164 * fs_operation.c 1165 */ 1166extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *); 1167extern int afs_put_operation(struct afs_operation *); 1168extern bool afs_begin_vnode_operation(struct afs_operation *); 1169extern void afs_wait_for_operation(struct afs_operation *); 1170extern int afs_do_sync_operation(struct afs_operation *); 1171 1172static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n, 1173 struct afs_vnode *vnode) 1174{ 1175 op->file[n].vnode = vnode; 1176 op->file[n].need_io_lock = true; 1177} 1178 1179static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n, 1180 const struct afs_fid *fid) 1181{ 1182 op->file[n].fid = *fid; 1183} 1184 1185/* 1186 * fs_probe.c 1187 */ 1188struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate, 1189 enum afs_estate_trace where); 1190void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where); 1191extern void afs_fileserver_probe_result(struct afs_call *); 1192void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server, 1193 struct afs_addr_list *new_addrs, struct key *key); 1194int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr); 1195extern void afs_probe_fileserver(struct afs_net *, struct afs_server *); 1196extern void afs_fs_probe_dispatcher(struct work_struct *); 1197int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate, 1198 unsigned long exclude, bool is_intr); 1199extern void afs_fs_probe_cleanup(struct afs_net *); 1200 1201/* 1202 * inode.c 1203 */ 1204extern const struct afs_operation_ops afs_fetch_status_operation; 1205 1206extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *); 1207extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *); 1208extern int afs_ilookup5_test_by_fid(struct inode *, void *); 1209extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool); 1210extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *); 1211extern struct inode *afs_root_iget(struct super_block *, struct key *); 1212extern int afs_getattr(struct mnt_idmap *idmap, const struct path *, 1213 struct kstat *, u32, unsigned int); 1214extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *); 1215extern void afs_evict_inode(struct inode *); 1216extern int afs_drop_inode(struct inode *); 1217 1218/* 1219 * main.c 1220 */ 1221extern struct workqueue_struct *afs_wq; 1222extern int afs_net_id; 1223 1224static inline struct afs_net *afs_net(struct net *net) 1225{ 1226 return net_generic(net, afs_net_id); 1227} 1228 1229static inline struct afs_net *afs_sb2net(struct super_block *sb) 1230{ 1231 return afs_net(AFS_FS_S(sb)->net_ns); 1232} 1233 1234static inline struct afs_net *afs_d2net(struct dentry *dentry) 1235{ 1236 return afs_sb2net(dentry->d_sb); 1237} 1238 1239static inline struct afs_net *afs_i2net(struct inode *inode) 1240{ 1241 return afs_sb2net(inode->i_sb); 1242} 1243 1244static inline struct afs_net *afs_v2net(struct afs_vnode *vnode) 1245{ 1246 return afs_i2net(&vnode->netfs.inode); 1247} 1248 1249static inline struct afs_net *afs_sock2net(struct sock *sk) 1250{ 1251 return net_generic(sock_net(sk), afs_net_id); 1252} 1253 1254static inline void __afs_stat(atomic_t *s) 1255{ 1256 atomic_inc(s); 1257} 1258 1259#define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n) 1260 1261/* 1262 * misc.c 1263 */ 1264extern int afs_abort_to_error(u32); 1265extern void afs_prioritise_error(struct afs_error *, int, u32); 1266 1267static inline void afs_op_nomem(struct afs_operation *op) 1268{ 1269 op->cumul_error.error = -ENOMEM; 1270} 1271 1272static inline int afs_op_error(const struct afs_operation *op) 1273{ 1274 return op->cumul_error.error; 1275} 1276 1277static inline s32 afs_op_abort_code(const struct afs_operation *op) 1278{ 1279 return op->cumul_error.abort_code; 1280} 1281 1282static inline int afs_op_set_error(struct afs_operation *op, int error) 1283{ 1284 return op->cumul_error.error = error; 1285} 1286 1287static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code) 1288{ 1289 afs_prioritise_error(&op->cumul_error, error, abort_code); 1290} 1291 1292/* 1293 * mntpt.c 1294 */ 1295extern const struct inode_operations afs_mntpt_inode_operations; 1296extern const struct inode_operations afs_autocell_inode_operations; 1297extern const struct file_operations afs_mntpt_file_operations; 1298 1299extern struct vfsmount *afs_d_automount(struct path *); 1300extern void afs_mntpt_kill_timer(void); 1301 1302/* 1303 * proc.c 1304 */ 1305#ifdef CONFIG_PROC_FS 1306extern int __net_init afs_proc_init(struct afs_net *); 1307extern void __net_exit afs_proc_cleanup(struct afs_net *); 1308extern int afs_proc_cell_setup(struct afs_cell *); 1309extern void afs_proc_cell_remove(struct afs_cell *); 1310extern void afs_put_sysnames(struct afs_sysnames *); 1311#else 1312static inline int afs_proc_init(struct afs_net *net) { return 0; } 1313static inline void afs_proc_cleanup(struct afs_net *net) {} 1314static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; } 1315static inline void afs_proc_cell_remove(struct afs_cell *cell) {} 1316static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {} 1317#endif 1318 1319/* 1320 * rotate.c 1321 */ 1322void afs_clear_server_states(struct afs_operation *op); 1323extern bool afs_select_fileserver(struct afs_operation *); 1324extern void afs_dump_edestaddrreq(const struct afs_operation *); 1325 1326/* 1327 * rxrpc.c 1328 */ 1329extern struct workqueue_struct *afs_async_calls; 1330 1331extern int __net_init afs_open_socket(struct afs_net *); 1332extern void __net_exit afs_close_socket(struct afs_net *); 1333extern void afs_charge_preallocation(struct work_struct *); 1334extern void afs_put_call(struct afs_call *); 1335void afs_make_call(struct afs_call *call, gfp_t gfp); 1336void afs_wait_for_call_to_complete(struct afs_call *call); 1337extern struct afs_call *afs_alloc_flat_call(struct afs_net *, 1338 const struct afs_call_type *, 1339 size_t, size_t); 1340extern void afs_flat_call_destructor(struct afs_call *); 1341extern void afs_send_empty_reply(struct afs_call *); 1342extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 1343extern int afs_extract_data(struct afs_call *, bool); 1344extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause); 1345 1346static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call, 1347 gfp_t gfp) 1348{ 1349 struct afs_addr_list *alist = op->estate->addresses; 1350 1351 op->call = call; 1352 op->type = call->type; 1353 call->op = op; 1354 call->key = op->key; 1355 call->intr = !(op->flags & AFS_OPERATION_UNINTR); 1356 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer); 1357 call->service_id = op->server->service_id; 1358 afs_make_call(call, gfp); 1359} 1360 1361static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size) 1362{ 1363 call->iov_len = size; 1364 call->kvec[0].iov_base = buf; 1365 call->kvec[0].iov_len = size; 1366 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size); 1367} 1368 1369static inline void afs_extract_to_tmp(struct afs_call *call) 1370{ 1371 call->iov_len = sizeof(call->tmp); 1372 afs_extract_begin(call, &call->tmp, sizeof(call->tmp)); 1373} 1374 1375static inline void afs_extract_to_tmp64(struct afs_call *call) 1376{ 1377 call->iov_len = sizeof(call->tmp64); 1378 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64)); 1379} 1380 1381static inline void afs_extract_discard(struct afs_call *call, size_t size) 1382{ 1383 call->iov_len = size; 1384 iov_iter_discard(&call->def_iter, ITER_DEST, size); 1385} 1386 1387static inline void afs_extract_to_buf(struct afs_call *call, size_t size) 1388{ 1389 call->iov_len = size; 1390 afs_extract_begin(call, call->buffer, size); 1391} 1392 1393static inline int afs_transfer_reply(struct afs_call *call) 1394{ 1395 return afs_extract_data(call, false); 1396} 1397 1398static inline bool afs_check_call_state(struct afs_call *call, 1399 enum afs_call_state state) 1400{ 1401 return READ_ONCE(call->state) == state; 1402} 1403 1404static inline bool afs_set_call_state(struct afs_call *call, 1405 enum afs_call_state from, 1406 enum afs_call_state to) 1407{ 1408 bool ok = false; 1409 1410 spin_lock_bh(&call->state_lock); 1411 if (call->state == from) { 1412 call->state = to; 1413 trace_afs_call_state(call, from, to, 0, 0); 1414 ok = true; 1415 } 1416 spin_unlock_bh(&call->state_lock); 1417 return ok; 1418} 1419 1420static inline void afs_set_call_complete(struct afs_call *call, 1421 int error, u32 remote_abort) 1422{ 1423 enum afs_call_state state; 1424 bool ok = false; 1425 1426 spin_lock_bh(&call->state_lock); 1427 state = call->state; 1428 if (state != AFS_CALL_COMPLETE) { 1429 call->abort_code = remote_abort; 1430 call->error = error; 1431 call->state = AFS_CALL_COMPLETE; 1432 trace_afs_call_state(call, state, AFS_CALL_COMPLETE, 1433 error, remote_abort); 1434 ok = true; 1435 } 1436 spin_unlock_bh(&call->state_lock); 1437 if (ok) { 1438 trace_afs_call_done(call); 1439 1440 /* Asynchronous calls have two refs to release - one from the alloc and 1441 * one queued with the work item - and we can't just deallocate the 1442 * call because the work item may be queued again. 1443 */ 1444 if (call->drop_ref) 1445 afs_put_call(call); 1446 } 1447} 1448 1449/* 1450 * security.c 1451 */ 1452extern void afs_put_permits(struct afs_permits *); 1453extern void afs_clear_permits(struct afs_vnode *); 1454extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int, 1455 struct afs_status_cb *); 1456extern struct key *afs_request_key(struct afs_cell *); 1457extern struct key *afs_request_key_rcu(struct afs_cell *); 1458extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *); 1459extern int afs_permission(struct mnt_idmap *, struct inode *, int); 1460extern void __exit afs_clean_up_permit_cache(void); 1461 1462/* 1463 * server.c 1464 */ 1465extern spinlock_t afs_server_peer_lock; 1466 1467extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *); 1468extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *); 1469extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32); 1470extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace); 1471extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace); 1472extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1473extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace); 1474extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace); 1475extern void afs_manage_servers(struct work_struct *); 1476extern void afs_servers_timer(struct timer_list *); 1477extern void afs_fs_probe_timer(struct timer_list *); 1478extern void __net_exit afs_purge_servers(struct afs_net *); 1479bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key); 1480 1481static inline void afs_inc_servers_outstanding(struct afs_net *net) 1482{ 1483 atomic_inc(&net->servers_outstanding); 1484} 1485 1486static inline void afs_dec_servers_outstanding(struct afs_net *net) 1487{ 1488 if (atomic_dec_and_test(&net->servers_outstanding)) 1489 wake_up_var(&net->servers_outstanding); 1490} 1491 1492static inline bool afs_is_probing_server(struct afs_server *server) 1493{ 1494 return list_empty(&server->probe_link); 1495} 1496 1497/* 1498 * server_list.c 1499 */ 1500static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist) 1501{ 1502 refcount_inc(&slist->usage); 1503 return slist; 1504} 1505 1506extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *); 1507struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume, 1508 struct key *key, 1509 struct afs_vldb_entry *vldb); 1510extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *); 1511void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist); 1512void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist, 1513 struct afs_server_list *old); 1514void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist); 1515 1516/* 1517 * super.c 1518 */ 1519extern int __init afs_fs_init(void); 1520extern void afs_fs_exit(void); 1521 1522/* 1523 * validation.c 1524 */ 1525bool afs_check_validity(const struct afs_vnode *vnode); 1526int afs_update_volume_state(struct afs_operation *op); 1527int afs_validate(struct afs_vnode *vnode, struct key *key); 1528 1529/* 1530 * vlclient.c 1531 */ 1532extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *, 1533 const char *, int); 1534extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *); 1535struct afs_call *afs_vl_get_capabilities(struct afs_net *net, 1536 struct afs_addr_list *alist, 1537 unsigned int addr_index, 1538 struct key *key, 1539 struct afs_vlserver *server, 1540 unsigned int server_index); 1541extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *); 1542extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *); 1543 1544/* 1545 * vl_alias.c 1546 */ 1547extern int afs_cell_detect_alias(struct afs_cell *, struct key *); 1548 1549/* 1550 * vl_probe.c 1551 */ 1552extern void afs_vlserver_probe_result(struct afs_call *); 1553extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *); 1554extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long); 1555 1556/* 1557 * vl_rotate.c 1558 */ 1559extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *, 1560 struct afs_cell *, struct key *); 1561extern bool afs_select_vlserver(struct afs_vl_cursor *); 1562extern bool afs_select_current_vlserver(struct afs_vl_cursor *); 1563extern int afs_end_vlserver_operation(struct afs_vl_cursor *); 1564 1565/* 1566 * vlserver_list.c 1567 */ 1568static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver) 1569{ 1570 refcount_inc(&vlserver->ref); 1571 return vlserver; 1572} 1573 1574static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist) 1575{ 1576 if (vllist) 1577 refcount_inc(&vllist->ref); 1578 return vllist; 1579} 1580 1581extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short); 1582extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *); 1583extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int); 1584extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *); 1585extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *, 1586 const void *, size_t); 1587 1588/* 1589 * volume.c 1590 */ 1591extern struct afs_volume *afs_create_volume(struct afs_fs_context *); 1592extern int afs_activate_volume(struct afs_volume *); 1593extern void afs_deactivate_volume(struct afs_volume *); 1594bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1595extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace); 1596void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason); 1597extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); 1598 1599/* 1600 * write.c 1601 */ 1602extern int afs_writepages(struct address_space *, struct writeback_control *); 1603extern int afs_fsync(struct file *, loff_t, loff_t, int); 1604extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); 1605extern void afs_prune_wb_keys(struct afs_vnode *); 1606void afs_create_write_requests(struct netfs_io_request *wreq, loff_t start, size_t len); 1607 1608/* 1609 * xattr.c 1610 */ 1611extern const struct xattr_handler * const afs_xattr_handlers[]; 1612 1613/* 1614 * yfsclient.c 1615 */ 1616extern void yfs_fs_fetch_data(struct afs_operation *); 1617extern void yfs_fs_create_file(struct afs_operation *); 1618extern void yfs_fs_make_dir(struct afs_operation *); 1619extern void yfs_fs_remove_file2(struct afs_operation *); 1620extern void yfs_fs_remove_file(struct afs_operation *); 1621extern void yfs_fs_remove_dir(struct afs_operation *); 1622extern void yfs_fs_link(struct afs_operation *); 1623extern void yfs_fs_symlink(struct afs_operation *); 1624extern void yfs_fs_rename(struct afs_operation *); 1625extern void yfs_fs_store_data(struct afs_operation *); 1626extern void yfs_fs_setattr(struct afs_operation *); 1627extern void yfs_fs_get_volume_status(struct afs_operation *); 1628extern void yfs_fs_set_lock(struct afs_operation *); 1629extern void yfs_fs_extend_lock(struct afs_operation *); 1630extern void yfs_fs_release_lock(struct afs_operation *); 1631extern void yfs_fs_fetch_status(struct afs_operation *); 1632extern void yfs_fs_inline_bulk_status(struct afs_operation *); 1633 1634struct yfs_acl { 1635 struct afs_acl *acl; /* Dir/file/symlink ACL */ 1636 struct afs_acl *vol_acl; /* Whole volume ACL */ 1637 u32 inherit_flag; /* True if ACL is inherited from parent dir */ 1638 u32 num_cleaned; /* Number of ACEs removed due to subject removal */ 1639 unsigned int flags; 1640#define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */ 1641#define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */ 1642}; 1643 1644extern void yfs_free_opaque_acl(struct yfs_acl *); 1645extern void yfs_fs_fetch_opaque_acl(struct afs_operation *); 1646extern void yfs_fs_store_opaque_acl2(struct afs_operation *); 1647 1648/* 1649 * Miscellaneous inline functions. 1650 */ 1651static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 1652{ 1653 return container_of(inode, struct afs_vnode, netfs.inode); 1654} 1655 1656static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 1657{ 1658 return &vnode->netfs.inode; 1659} 1660 1661/* 1662 * Note that a dentry got changed. We need to set d_fsdata to the data version 1663 * number derived from the result of the operation. It doesn't matter if 1664 * d_fsdata goes backwards as we'll just revalidate. 1665 */ 1666static inline void afs_update_dentry_version(struct afs_operation *op, 1667 struct afs_vnode_param *dir_vp, 1668 struct dentry *dentry) 1669{ 1670 if (!op->cumul_error.error) 1671 dentry->d_fsdata = 1672 (void *)(unsigned long)dir_vp->scb.status.data_version; 1673} 1674 1675/* 1676 * Set the file size and block count. Estimate the number of 512 bytes blocks 1677 * used, rounded up to nearest 1K for consistency with other AFS clients. 1678 */ 1679static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size) 1680{ 1681 i_size_write(&vnode->netfs.inode, size); 1682 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1; 1683} 1684 1685/* 1686 * Check for a conflicting operation on a directory that we just unlinked from. 1687 * If someone managed to sneak a link or an unlink in on the file we just 1688 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS). 1689 */ 1690static inline void afs_check_dir_conflict(struct afs_operation *op, 1691 struct afs_vnode_param *dvp) 1692{ 1693 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version) 1694 op->flags |= AFS_OPERATION_DIR_CONFLICT; 1695} 1696 1697static inline int afs_io_error(struct afs_call *call, enum afs_io_error where) 1698{ 1699 trace_afs_io_error(call->debug_id, -EIO, where); 1700 return -EIO; 1701} 1702 1703static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where) 1704{ 1705 trace_afs_file_error(vnode, -EIO, where); 1706 return -EIO; 1707} 1708 1709/*****************************************************************************/ 1710/* 1711 * debug tracing 1712 */ 1713extern unsigned afs_debug; 1714 1715#define dbgprintk(FMT,...) \ 1716 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1717 1718#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1719#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1720#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1721 1722 1723#if defined(__KDEBUG) 1724#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1725#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1726#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1727 1728#elif defined(CONFIG_AFS_DEBUG) 1729#define AFS_DEBUG_KENTER 0x01 1730#define AFS_DEBUG_KLEAVE 0x02 1731#define AFS_DEBUG_KDEBUG 0x04 1732 1733#define _enter(FMT,...) \ 1734do { \ 1735 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 1736 kenter(FMT,##__VA_ARGS__); \ 1737} while (0) 1738 1739#define _leave(FMT,...) \ 1740do { \ 1741 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 1742 kleave(FMT,##__VA_ARGS__); \ 1743} while (0) 1744 1745#define _debug(FMT,...) \ 1746do { \ 1747 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 1748 kdebug(FMT,##__VA_ARGS__); \ 1749} while (0) 1750 1751#else 1752#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1753#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1754#define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1755#endif 1756 1757/* 1758 * debug assertion checking 1759 */ 1760#if 1 // defined(__KDEBUGALL) 1761 1762#define ASSERT(X) \ 1763do { \ 1764 if (unlikely(!(X))) { \ 1765 printk(KERN_ERR "\n"); \ 1766 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1767 BUG(); \ 1768 } \ 1769} while(0) 1770 1771#define ASSERTCMP(X, OP, Y) \ 1772do { \ 1773 if (unlikely(!((X) OP (Y)))) { \ 1774 printk(KERN_ERR "\n"); \ 1775 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1776 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1777 (unsigned long)(X), (unsigned long)(Y)); \ 1778 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1779 (unsigned long)(X), (unsigned long)(Y)); \ 1780 BUG(); \ 1781 } \ 1782} while(0) 1783 1784#define ASSERTRANGE(L, OP1, N, OP2, H) \ 1785do { \ 1786 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 1787 printk(KERN_ERR "\n"); \ 1788 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1789 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 1790 (unsigned long)(L), (unsigned long)(N), \ 1791 (unsigned long)(H)); \ 1792 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 1793 (unsigned long)(L), (unsigned long)(N), \ 1794 (unsigned long)(H)); \ 1795 BUG(); \ 1796 } \ 1797} while(0) 1798 1799#define ASSERTIF(C, X) \ 1800do { \ 1801 if (unlikely((C) && !(X))) { \ 1802 printk(KERN_ERR "\n"); \ 1803 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1804 BUG(); \ 1805 } \ 1806} while(0) 1807 1808#define ASSERTIFCMP(C, X, OP, Y) \ 1809do { \ 1810 if (unlikely((C) && !((X) OP (Y)))) { \ 1811 printk(KERN_ERR "\n"); \ 1812 printk(KERN_ERR "AFS: Assertion failed\n"); \ 1813 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 1814 (unsigned long)(X), (unsigned long)(Y)); \ 1815 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 1816 (unsigned long)(X), (unsigned long)(Y)); \ 1817 BUG(); \ 1818 } \ 1819} while(0) 1820 1821#else 1822 1823#define ASSERT(X) \ 1824do { \ 1825} while(0) 1826 1827#define ASSERTCMP(X, OP, Y) \ 1828do { \ 1829} while(0) 1830 1831#define ASSERTRANGE(L, OP1, N, OP2, H) \ 1832do { \ 1833} while(0) 1834 1835#define ASSERTIF(C, X) \ 1836do { \ 1837} while(0) 1838 1839#define ASSERTIFCMP(C, X, OP, Y) \ 1840do { \ 1841} while(0) 1842 1843#endif /* __KDEBUGALL */ 1844