1 /* internal AFS stuff 2 * 3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/compiler.h> 13 #include <linux/kernel.h> 14 #include <linux/ktime.h> 15 #include <linux/fs.h> 16 #include <linux/pagemap.h> 17 #include <linux/rxrpc.h> 18 #include <linux/key.h> 19 #include <linux/workqueue.h> 20 #include <linux/sched.h> 21 #include <linux/fscache.h> 22 #include <linux/backing-dev.h> 23 #include <linux/uuid.h> 24 #include <net/af_rxrpc.h> 25 26 #include "afs.h" 27 #include "afs_vl.h" 28 29 #define AFS_CELL_MAX_ADDRS 15 30 31 struct pagevec; 32 struct afs_call; 33 34 typedef enum { 35 AFS_VL_NEW, /* new, uninitialised record */ 36 AFS_VL_CREATING, /* creating record */ 37 AFS_VL_VALID, /* record is pending */ 38 AFS_VL_NO_VOLUME, /* no such volume available */ 39 AFS_VL_UPDATING, /* update in progress */ 40 AFS_VL_VOLUME_DELETED, /* volume was deleted */ 41 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */ 42 } __attribute__((packed)) afs_vlocation_state_t; 43 44 struct afs_mount_params { 45 bool rwpath; /* T if the parent should be considered R/W */ 46 bool force; /* T to force cell type */ 47 bool autocell; /* T if set auto mount operation */ 48 afs_voltype_t type; /* type of volume requested */ 49 int volnamesz; /* size of volume name */ 50 const char *volname; /* name of volume to mount */ 51 struct afs_cell *cell; /* cell in which to find volume */ 52 struct afs_volume *volume; /* volume record */ 53 struct key *key; /* key to use for secure mounting */ 54 }; 55 56 enum afs_call_state { 57 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 58 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 59 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */ 60 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */ 61 AFS_CALL_REPLYING, /* replying to incoming call */ 62 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */ 63 AFS_CALL_COMPLETE, /* Completed or failed */ 64 }; 65 /* 66 * a record of an in-progress RxRPC call 67 */ 68 struct afs_call { 69 const struct afs_call_type *type; /* type of call */ 70 wait_queue_head_t waitq; /* processes awaiting completion */ 71 struct work_struct async_work; /* async I/O processor */ 72 struct work_struct work; /* actual work processor */ 73 struct rxrpc_call *rxcall; /* RxRPC call handle */ 74 struct key *key; /* security for this call */ 75 struct afs_server *server; /* server affected by incoming CM call */ 76 void *request; /* request data (first part) */ 77 struct address_space *mapping; /* page set */ 78 struct afs_writeback *wb; /* writeback being performed */ 79 void *buffer; /* reply receive buffer */ 80 void *reply; /* reply buffer (first part) */ 81 void *reply2; /* reply buffer (second part) */ 82 void *reply3; /* reply buffer (third part) */ 83 void *reply4; /* reply buffer (fourth part) */ 84 pgoff_t first; /* first page in mapping to deal with */ 85 pgoff_t last; /* last page in mapping to deal with */ 86 size_t offset; /* offset into received data store */ 87 atomic_t usage; 88 enum afs_call_state state; 89 int error; /* error code */ 90 u32 abort_code; /* Remote abort ID or 0 */ 91 unsigned request_size; /* size of request data */ 92 unsigned reply_max; /* maximum size of reply */ 93 unsigned first_offset; /* offset into mapping[first] */ 94 union { 95 unsigned last_to; /* amount of mapping[last] */ 96 unsigned count2; /* count used in unmarshalling */ 97 }; 98 unsigned char unmarshall; /* unmarshalling phase */ 99 bool incoming; /* T if incoming call */ 100 bool send_pages; /* T if data from mapping should be sent */ 101 bool need_attention; /* T if RxRPC poked us */ 102 bool async; /* T if asynchronous */ 103 u16 service_id; /* RxRPC service ID to call */ 104 __be16 port; /* target UDP port */ 105 u32 operation_ID; /* operation ID for an incoming call */ 106 u32 count; /* count for use in unmarshalling */ 107 __be32 tmp; /* place to extract temporary data */ 108 afs_dataversion_t store_version; /* updated version expected from store */ 109 }; 110 111 struct afs_call_type { 112 const char *name; 113 114 /* deliver request or reply data to an call 115 * - returning an error will cause the call to be aborted 116 */ 117 int (*deliver)(struct afs_call *call); 118 119 /* map an abort code to an error number */ 120 int (*abort_to_error)(u32 abort_code); 121 122 /* clean up a call */ 123 void (*destructor)(struct afs_call *call); 124 125 /* Work function */ 126 void (*work)(struct work_struct *work); 127 }; 128 129 /* 130 * Record of an outstanding read operation on a vnode. 131 */ 132 struct afs_read { 133 loff_t pos; /* Where to start reading */ 134 loff_t len; /* How much we're asking for */ 135 loff_t actual_len; /* How much we're actually getting */ 136 loff_t remain; /* Amount remaining */ 137 atomic_t usage; 138 unsigned int index; /* Which page we're reading into */ 139 unsigned int nr_pages; 140 void (*page_done)(struct afs_call *, struct afs_read *); 141 struct page *pages[]; 142 }; 143 144 /* 145 * record of an outstanding writeback on a vnode 146 */ 147 struct afs_writeback { 148 struct list_head link; /* link in vnode->writebacks */ 149 struct work_struct writer; /* work item to perform the writeback */ 150 struct afs_vnode *vnode; /* vnode to which this write applies */ 151 struct key *key; /* owner of this write */ 152 wait_queue_head_t waitq; /* completion and ready wait queue */ 153 pgoff_t first; /* first page in batch */ 154 pgoff_t point; /* last page in current store op */ 155 pgoff_t last; /* last page in batch (inclusive) */ 156 unsigned offset_first; /* offset into first page of start of write */ 157 unsigned to_last; /* offset into last page of end of write */ 158 int num_conflicts; /* count of conflicting writes in list */ 159 int usage; 160 bool conflicts; /* T if has dependent conflicts */ 161 enum { 162 AFS_WBACK_SYNCING, /* synchronisation being performed */ 163 AFS_WBACK_PENDING, /* write pending */ 164 AFS_WBACK_CONFLICTING, /* conflicting writes posted */ 165 AFS_WBACK_WRITING, /* writing back */ 166 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */ 167 } state __attribute__((packed)); 168 }; 169 170 /* 171 * AFS superblock private data 172 * - there's one superblock per volume 173 */ 174 struct afs_super_info { 175 struct afs_volume *volume; /* volume record */ 176 char rwparent; /* T if parent is R/W AFS volume */ 177 }; 178 179 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 180 { 181 return sb->s_fs_info; 182 } 183 184 extern struct file_system_type afs_fs_type; 185 186 /* 187 * entry in the cached cell catalogue 188 */ 189 struct afs_cache_cell { 190 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 191 struct in_addr vl_servers[15]; /* cached cell VL servers */ 192 }; 193 194 /* 195 * AFS cell record 196 */ 197 struct afs_cell { 198 atomic_t usage; 199 struct list_head link; /* main cell list link */ 200 struct key *anonymous_key; /* anonymous user key for this cell */ 201 struct list_head proc_link; /* /proc cell list link */ 202 #ifdef CONFIG_AFS_FSCACHE 203 struct fscache_cookie *cache; /* caching cookie */ 204 #endif 205 206 /* server record management */ 207 rwlock_t servers_lock; /* active server list lock */ 208 struct list_head servers; /* active server list */ 209 210 /* volume location record management */ 211 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 212 struct list_head vl_list; /* cell's active VL record list */ 213 spinlock_t vl_lock; /* vl_list lock */ 214 unsigned short vl_naddrs; /* number of VL servers in addr list */ 215 unsigned short vl_curr_svix; /* current server index */ 216 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 217 218 char name[0]; /* cell name - must go last */ 219 }; 220 221 /* 222 * entry in the cached volume location catalogue 223 */ 224 struct afs_cache_vlocation { 225 /* volume name (lowercase, padded with NULs) */ 226 uint8_t name[AFS_MAXVOLNAME + 1]; 227 228 uint8_t nservers; /* number of entries used in servers[] */ 229 uint8_t vidmask; /* voltype mask for vid[] */ 230 uint8_t srvtmask[8]; /* voltype masks for servers[] */ 231 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 232 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 233 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 234 235 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ 236 struct in_addr servers[8]; /* fileserver addresses */ 237 time_t rtime; /* last retrieval time */ 238 }; 239 240 /* 241 * volume -> vnode hash table entry 242 */ 243 struct afs_cache_vhash { 244 afs_voltype_t vtype; /* which volume variation */ 245 uint8_t hash_bucket; /* which hash bucket this represents */ 246 } __attribute__((packed)); 247 248 /* 249 * AFS volume location record 250 */ 251 struct afs_vlocation { 252 atomic_t usage; 253 time64_t time_of_death; /* time at which put reduced usage to 0 */ 254 struct list_head link; /* link in cell volume location list */ 255 struct list_head grave; /* link in master graveyard list */ 256 struct list_head update; /* link in master update list */ 257 struct afs_cell *cell; /* cell to which volume belongs */ 258 #ifdef CONFIG_AFS_FSCACHE 259 struct fscache_cookie *cache; /* caching cookie */ 260 #endif 261 struct afs_cache_vlocation vldb; /* volume information DB record */ 262 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ 263 wait_queue_head_t waitq; /* status change waitqueue */ 264 time64_t update_at; /* time at which record should be updated */ 265 spinlock_t lock; /* access lock */ 266 afs_vlocation_state_t state; /* volume location state */ 267 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ 268 unsigned short upd_busy_cnt; /* EBUSY count during update */ 269 bool valid; /* T if valid */ 270 }; 271 272 /* 273 * AFS fileserver record 274 */ 275 struct afs_server { 276 atomic_t usage; 277 time64_t time_of_death; /* time at which put reduced usage to 0 */ 278 struct in_addr addr; /* server address */ 279 struct afs_cell *cell; /* cell in which server resides */ 280 struct list_head link; /* link in cell's server list */ 281 struct list_head grave; /* link in master graveyard list */ 282 struct rb_node master_rb; /* link in master by-addr tree */ 283 struct rw_semaphore sem; /* access lock */ 284 285 /* file service access */ 286 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */ 287 unsigned long fs_act_jif; /* time at which last activity occurred */ 288 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ 289 spinlock_t fs_lock; /* access lock */ 290 int fs_state; /* 0 or reason FS currently marked dead (-errno) */ 291 292 /* callback promise management */ 293 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */ 294 struct delayed_work cb_updater; /* callback updater */ 295 struct delayed_work cb_break_work; /* collected break dispatcher */ 296 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */ 297 spinlock_t cb_lock; /* access lock */ 298 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */ 299 atomic_t cb_break_n; /* number of pending breaks */ 300 u8 cb_break_head; /* head of callback breaking ring */ 301 u8 cb_break_tail; /* tail of callback breaking ring */ 302 }; 303 304 /* 305 * AFS volume access record 306 */ 307 struct afs_volume { 308 atomic_t usage; 309 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ 310 struct afs_vlocation *vlocation; /* volume location */ 311 #ifdef CONFIG_AFS_FSCACHE 312 struct fscache_cookie *cache; /* caching cookie */ 313 #endif 314 afs_volid_t vid; /* volume ID */ 315 afs_voltype_t type; /* type of volume */ 316 char type_force; /* force volume type (suppress R/O -> R/W) */ 317 unsigned short nservers; /* number of server slots filled */ 318 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ 319 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ 320 struct rw_semaphore server_sem; /* lock for accessing current server */ 321 }; 322 323 /* 324 * vnode catalogue entry 325 */ 326 struct afs_cache_vnode { 327 afs_vnodeid_t vnode_id; /* vnode ID */ 328 unsigned vnode_unique; /* vnode ID uniquifier */ 329 afs_dataversion_t data_version; /* data version */ 330 }; 331 332 /* 333 * AFS inode private data 334 */ 335 struct afs_vnode { 336 struct inode vfs_inode; /* the VFS's inode record */ 337 338 struct afs_volume *volume; /* volume on which vnode resides */ 339 struct afs_server *server; /* server currently supplying this file */ 340 struct afs_fid fid; /* the file identifier for this inode */ 341 struct afs_file_status status; /* AFS status info for this file */ 342 #ifdef CONFIG_AFS_FSCACHE 343 struct fscache_cookie *cache; /* caching cookie */ 344 #endif 345 struct afs_permits *permits; /* cache of permits so far obtained */ 346 struct mutex permits_lock; /* lock for altering permits list */ 347 struct mutex validate_lock; /* lock for validating this vnode */ 348 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 349 int update_cnt; /* number of outstanding ops that will update the 350 * status */ 351 spinlock_t writeback_lock; /* lock for writebacks */ 352 spinlock_t lock; /* waitqueue/flags lock */ 353 unsigned long flags; 354 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 355 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 356 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */ 357 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 358 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 359 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 360 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */ 361 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */ 362 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */ 363 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */ 364 #define AFS_VNODE_AUTOCELL 10 /* set if Vnode is an auto mount point */ 365 #define AFS_VNODE_PSEUDODIR 11 /* set if Vnode is a pseudo directory */ 366 367 long acl_order; /* ACL check count (callback break count) */ 368 369 struct list_head writebacks; /* alterations in pagecache that need writing */ 370 struct list_head pending_locks; /* locks waiting to be granted */ 371 struct list_head granted_locks; /* locks granted on this file */ 372 struct delayed_work lock_work; /* work to be done in locking */ 373 struct key *unlock_key; /* key to be used in unlocking */ 374 375 /* outstanding callback notification on this file */ 376 struct rb_node server_rb; /* link in server->fs_vnodes */ 377 struct rb_node cb_promise; /* link in server->cb_promises */ 378 struct work_struct cb_broken_work; /* work to be done on callback break */ 379 time64_t cb_expires; /* time at which callback expires */ 380 time64_t cb_expires_at; /* time used to order cb_promise */ 381 unsigned cb_version; /* callback version */ 382 unsigned cb_expiry; /* callback expiry time */ 383 afs_callback_type_t cb_type; /* type of callback */ 384 bool cb_promised; /* true if promise still holds */ 385 }; 386 387 /* 388 * cached security record for one user's attempt to access a vnode 389 */ 390 struct afs_permit { 391 struct key *key; /* RxRPC ticket holding a security context */ 392 afs_access_t access_mask; /* access mask for this key */ 393 }; 394 395 /* 396 * cache of security records from attempts to access a vnode 397 */ 398 struct afs_permits { 399 struct rcu_head rcu; /* disposal procedure */ 400 int count; /* number of records */ 401 struct afs_permit permits[0]; /* the permits so far examined */ 402 }; 403 404 /* 405 * record of one of a system's set of network interfaces 406 */ 407 struct afs_interface { 408 struct in_addr address; /* IPv4 address bound to interface */ 409 struct in_addr netmask; /* netmask applied to address */ 410 unsigned mtu; /* MTU of interface */ 411 }; 412 413 /*****************************************************************************/ 414 /* 415 * cache.c 416 */ 417 #ifdef CONFIG_AFS_FSCACHE 418 extern struct fscache_netfs afs_cache_netfs; 419 extern struct fscache_cookie_def afs_cell_cache_index_def; 420 extern struct fscache_cookie_def afs_vlocation_cache_index_def; 421 extern struct fscache_cookie_def afs_volume_cache_index_def; 422 extern struct fscache_cookie_def afs_vnode_cache_index_def; 423 #else 424 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 425 #define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL) 426 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 427 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 428 #endif 429 430 /* 431 * callback.c 432 */ 433 extern void afs_init_callback_state(struct afs_server *); 434 extern void afs_broken_callback_work(struct work_struct *); 435 extern void afs_break_callbacks(struct afs_server *, size_t, 436 struct afs_callback[]); 437 extern void afs_discard_callback_on_delete(struct afs_vnode *); 438 extern void afs_give_up_callback(struct afs_vnode *); 439 extern void afs_dispatch_give_up_callbacks(struct work_struct *); 440 extern void afs_flush_callback_breaks(struct afs_server *); 441 extern int __init afs_callback_update_init(void); 442 extern void afs_callback_update_kill(void); 443 444 /* 445 * cell.c 446 */ 447 extern struct rw_semaphore afs_proc_cells_sem; 448 extern struct list_head afs_proc_cells; 449 450 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) 451 extern int afs_cell_init(char *); 452 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool); 453 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool); 454 extern struct afs_cell *afs_grab_cell(struct afs_cell *); 455 extern void afs_put_cell(struct afs_cell *); 456 extern void afs_cell_purge(void); 457 458 /* 459 * cmservice.c 460 */ 461 extern bool afs_cm_incoming_call(struct afs_call *); 462 463 /* 464 * dir.c 465 */ 466 extern const struct inode_operations afs_dir_inode_operations; 467 extern const struct dentry_operations afs_fs_dentry_operations; 468 extern const struct file_operations afs_dir_file_operations; 469 470 /* 471 * file.c 472 */ 473 extern const struct address_space_operations afs_fs_aops; 474 extern const struct inode_operations afs_file_inode_operations; 475 extern const struct file_operations afs_file_operations; 476 477 extern int afs_open(struct inode *, struct file *); 478 extern int afs_release(struct inode *, struct file *); 479 extern int afs_page_filler(void *, struct page *); 480 extern void afs_put_read(struct afs_read *); 481 482 /* 483 * flock.c 484 */ 485 extern void __exit afs_kill_lock_manager(void); 486 extern void afs_lock_work(struct work_struct *); 487 extern void afs_lock_may_be_available(struct afs_vnode *); 488 extern int afs_lock(struct file *, int, struct file_lock *); 489 extern int afs_flock(struct file *, int, struct file_lock *); 490 491 /* 492 * fsclient.c 493 */ 494 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 495 struct afs_vnode *, struct afs_volsync *, 496 bool); 497 extern int afs_fs_give_up_callbacks(struct afs_server *, bool); 498 extern int afs_fs_fetch_data(struct afs_server *, struct key *, 499 struct afs_vnode *, struct afs_read *, bool); 500 extern int afs_fs_create(struct afs_server *, struct key *, 501 struct afs_vnode *, const char *, umode_t, 502 struct afs_fid *, struct afs_file_status *, 503 struct afs_callback *, bool); 504 extern int afs_fs_remove(struct afs_server *, struct key *, 505 struct afs_vnode *, const char *, bool, bool); 506 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 507 struct afs_vnode *, const char *, bool); 508 extern int afs_fs_symlink(struct afs_server *, struct key *, 509 struct afs_vnode *, const char *, const char *, 510 struct afs_fid *, struct afs_file_status *, bool); 511 extern int afs_fs_rename(struct afs_server *, struct key *, 512 struct afs_vnode *, const char *, 513 struct afs_vnode *, const char *, bool); 514 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *, 515 pgoff_t, pgoff_t, unsigned, unsigned, bool); 516 extern int afs_fs_setattr(struct afs_server *, struct key *, 517 struct afs_vnode *, struct iattr *, bool); 518 extern int afs_fs_get_volume_status(struct afs_server *, struct key *, 519 struct afs_vnode *, 520 struct afs_volume_status *, bool); 521 extern int afs_fs_set_lock(struct afs_server *, struct key *, 522 struct afs_vnode *, afs_lock_type_t, bool); 523 extern int afs_fs_extend_lock(struct afs_server *, struct key *, 524 struct afs_vnode *, bool); 525 extern int afs_fs_release_lock(struct afs_server *, struct key *, 526 struct afs_vnode *, bool); 527 528 /* 529 * inode.c 530 */ 531 extern struct inode *afs_iget_autocell(struct inode *, const char *, int, 532 struct key *); 533 extern struct inode *afs_iget(struct super_block *, struct key *, 534 struct afs_fid *, struct afs_file_status *, 535 struct afs_callback *); 536 extern void afs_zap_data(struct afs_vnode *); 537 extern int afs_validate(struct afs_vnode *, struct key *); 538 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 539 extern int afs_setattr(struct dentry *, struct iattr *); 540 extern void afs_evict_inode(struct inode *); 541 extern int afs_drop_inode(struct inode *); 542 543 /* 544 * main.c 545 */ 546 extern struct workqueue_struct *afs_wq; 547 extern struct uuid_v1 afs_uuid; 548 549 /* 550 * misc.c 551 */ 552 extern int afs_abort_to_error(u32); 553 554 /* 555 * mntpt.c 556 */ 557 extern const struct inode_operations afs_mntpt_inode_operations; 558 extern const struct inode_operations afs_autocell_inode_operations; 559 extern const struct file_operations afs_mntpt_file_operations; 560 561 extern struct vfsmount *afs_d_automount(struct path *); 562 extern void afs_mntpt_kill_timer(void); 563 564 /* 565 * netdevices.c 566 */ 567 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 568 569 /* 570 * proc.c 571 */ 572 extern int afs_proc_init(void); 573 extern void afs_proc_cleanup(void); 574 extern int afs_proc_cell_setup(struct afs_cell *); 575 extern void afs_proc_cell_remove(struct afs_cell *); 576 577 /* 578 * rxrpc.c 579 */ 580 extern struct socket *afs_socket; 581 extern atomic_t afs_outstanding_calls; 582 583 extern int afs_open_socket(void); 584 extern void afs_close_socket(void); 585 extern void afs_put_call(struct afs_call *); 586 extern int afs_queue_call_work(struct afs_call *); 587 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, bool); 588 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 589 size_t, size_t); 590 extern void afs_flat_call_destructor(struct afs_call *); 591 extern void afs_send_empty_reply(struct afs_call *); 592 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 593 extern int afs_extract_data(struct afs_call *, void *, size_t, bool); 594 595 static inline int afs_transfer_reply(struct afs_call *call) 596 { 597 return afs_extract_data(call, call->buffer, call->reply_max, false); 598 } 599 600 /* 601 * security.c 602 */ 603 extern void afs_clear_permits(struct afs_vnode *); 604 extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 605 extern void afs_zap_permits(struct rcu_head *); 606 extern struct key *afs_request_key(struct afs_cell *); 607 extern int afs_permission(struct inode *, int); 608 609 /* 610 * server.c 611 */ 612 extern spinlock_t afs_server_peer_lock; 613 614 #define afs_get_server(S) \ 615 do { \ 616 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 617 atomic_inc(&(S)->usage); \ 618 } while(0) 619 620 extern struct afs_server *afs_lookup_server(struct afs_cell *, 621 const struct in_addr *); 622 extern struct afs_server *afs_find_server(const struct sockaddr_rxrpc *); 623 extern void afs_put_server(struct afs_server *); 624 extern void __exit afs_purge_servers(void); 625 626 /* 627 * super.c 628 */ 629 extern int afs_fs_init(void); 630 extern void afs_fs_exit(void); 631 632 /* 633 * vlclient.c 634 */ 635 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 636 const char *, struct afs_cache_vlocation *, 637 bool); 638 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 639 afs_volid_t, afs_voltype_t, 640 struct afs_cache_vlocation *, bool); 641 642 /* 643 * vlocation.c 644 */ 645 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 646 647 extern int __init afs_vlocation_update_init(void); 648 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 649 struct key *, 650 const char *, size_t); 651 extern void afs_put_vlocation(struct afs_vlocation *); 652 extern void afs_vlocation_purge(void); 653 654 /* 655 * vnode.c 656 */ 657 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 658 { 659 return container_of(inode, struct afs_vnode, vfs_inode); 660 } 661 662 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 663 { 664 return &vnode->vfs_inode; 665 } 666 667 extern void afs_vnode_finalise_status_update(struct afs_vnode *, 668 struct afs_server *); 669 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 670 struct key *); 671 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 672 struct afs_read *); 673 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 674 umode_t, struct afs_fid *, struct afs_file_status *, 675 struct afs_callback *, struct afs_server **); 676 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 677 bool); 678 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 679 const char *); 680 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 681 const char *, struct afs_fid *, 682 struct afs_file_status *, struct afs_server **); 683 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 684 struct key *, const char *, const char *); 685 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t, 686 unsigned, unsigned); 687 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *); 688 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *, 689 struct afs_volume_status *); 690 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *, 691 afs_lock_type_t); 692 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *); 693 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *); 694 695 /* 696 * volume.c 697 */ 698 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 699 700 extern void afs_put_volume(struct afs_volume *); 701 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 702 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 703 extern int afs_volume_release_fileserver(struct afs_vnode *, 704 struct afs_server *, int); 705 706 /* 707 * write.c 708 */ 709 extern int afs_set_page_dirty(struct page *); 710 extern void afs_put_writeback(struct afs_writeback *); 711 extern int afs_write_begin(struct file *file, struct address_space *mapping, 712 loff_t pos, unsigned len, unsigned flags, 713 struct page **pagep, void **fsdata); 714 extern int afs_write_end(struct file *file, struct address_space *mapping, 715 loff_t pos, unsigned len, unsigned copied, 716 struct page *page, void *fsdata); 717 extern int afs_writepage(struct page *, struct writeback_control *); 718 extern int afs_writepages(struct address_space *, struct writeback_control *); 719 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 720 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 721 extern int afs_writeback_all(struct afs_vnode *); 722 extern int afs_flush(struct file *, fl_owner_t); 723 extern int afs_fsync(struct file *, loff_t, loff_t, int); 724 725 726 /*****************************************************************************/ 727 /* 728 * debug tracing 729 */ 730 #include <trace/events/afs.h> 731 732 extern unsigned afs_debug; 733 734 #define dbgprintk(FMT,...) \ 735 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 736 737 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 738 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 739 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 740 741 742 #if defined(__KDEBUG) 743 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 744 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 745 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 746 747 #elif defined(CONFIG_AFS_DEBUG) 748 #define AFS_DEBUG_KENTER 0x01 749 #define AFS_DEBUG_KLEAVE 0x02 750 #define AFS_DEBUG_KDEBUG 0x04 751 752 #define _enter(FMT,...) \ 753 do { \ 754 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 755 kenter(FMT,##__VA_ARGS__); \ 756 } while (0) 757 758 #define _leave(FMT,...) \ 759 do { \ 760 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 761 kleave(FMT,##__VA_ARGS__); \ 762 } while (0) 763 764 #define _debug(FMT,...) \ 765 do { \ 766 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 767 kdebug(FMT,##__VA_ARGS__); \ 768 } while (0) 769 770 #else 771 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 772 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 773 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 774 #endif 775 776 /* 777 * debug assertion checking 778 */ 779 #if 1 // defined(__KDEBUGALL) 780 781 #define ASSERT(X) \ 782 do { \ 783 if (unlikely(!(X))) { \ 784 printk(KERN_ERR "\n"); \ 785 printk(KERN_ERR "AFS: Assertion failed\n"); \ 786 BUG(); \ 787 } \ 788 } while(0) 789 790 #define ASSERTCMP(X, OP, Y) \ 791 do { \ 792 if (unlikely(!((X) OP (Y)))) { \ 793 printk(KERN_ERR "\n"); \ 794 printk(KERN_ERR "AFS: Assertion failed\n"); \ 795 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 796 (unsigned long)(X), (unsigned long)(Y)); \ 797 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 798 (unsigned long)(X), (unsigned long)(Y)); \ 799 BUG(); \ 800 } \ 801 } while(0) 802 803 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 804 do { \ 805 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 806 printk(KERN_ERR "\n"); \ 807 printk(KERN_ERR "AFS: Assertion failed\n"); \ 808 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 809 (unsigned long)(L), (unsigned long)(N), \ 810 (unsigned long)(H)); \ 811 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 812 (unsigned long)(L), (unsigned long)(N), \ 813 (unsigned long)(H)); \ 814 BUG(); \ 815 } \ 816 } while(0) 817 818 #define ASSERTIF(C, X) \ 819 do { \ 820 if (unlikely((C) && !(X))) { \ 821 printk(KERN_ERR "\n"); \ 822 printk(KERN_ERR "AFS: Assertion failed\n"); \ 823 BUG(); \ 824 } \ 825 } while(0) 826 827 #define ASSERTIFCMP(C, X, OP, Y) \ 828 do { \ 829 if (unlikely((C) && !((X) OP (Y)))) { \ 830 printk(KERN_ERR "\n"); \ 831 printk(KERN_ERR "AFS: Assertion failed\n"); \ 832 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 833 (unsigned long)(X), (unsigned long)(Y)); \ 834 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 835 (unsigned long)(X), (unsigned long)(Y)); \ 836 BUG(); \ 837 } \ 838 } while(0) 839 840 #else 841 842 #define ASSERT(X) \ 843 do { \ 844 } while(0) 845 846 #define ASSERTCMP(X, OP, Y) \ 847 do { \ 848 } while(0) 849 850 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 851 do { \ 852 } while(0) 853 854 #define ASSERTIF(C, X) \ 855 do { \ 856 } while(0) 857 858 #define ASSERTIFCMP(C, X, OP, Y) \ 859 do { \ 860 } while(0) 861 862 #endif /* __KDEBUGALL */ 863