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