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/skbuff.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 24 #include "afs.h" 25 #include "afs_vl.h" 26 27 #define AFS_CELL_MAX_ADDRS 15 28 29 struct pagevec; 30 struct afs_call; 31 32 typedef enum { 33 AFS_VL_NEW, /* new, uninitialised record */ 34 AFS_VL_CREATING, /* creating record */ 35 AFS_VL_VALID, /* record is pending */ 36 AFS_VL_NO_VOLUME, /* no such volume available */ 37 AFS_VL_UPDATING, /* update in progress */ 38 AFS_VL_VOLUME_DELETED, /* volume was deleted */ 39 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */ 40 } __attribute__((packed)) afs_vlocation_state_t; 41 42 struct afs_mount_params { 43 bool rwpath; /* T if the parent should be considered R/W */ 44 bool force; /* T to force cell type */ 45 bool autocell; /* T if set auto mount operation */ 46 afs_voltype_t type; /* type of volume requested */ 47 int volnamesz; /* size of volume name */ 48 const char *volname; /* name of volume to mount */ 49 struct afs_cell *cell; /* cell in which to find volume */ 50 struct afs_volume *volume; /* volume record */ 51 struct key *key; /* key to use for secure mounting */ 52 }; 53 54 /* 55 * definition of how to wait for the completion of an operation 56 */ 57 struct afs_wait_mode { 58 /* RxRPC received message notification */ 59 void (*rx_wakeup)(struct afs_call *call); 60 61 /* synchronous call waiter and call dispatched notification */ 62 int (*wait)(struct afs_call *call); 63 64 /* asynchronous call completion */ 65 void (*async_complete)(void *reply, int error); 66 }; 67 68 extern const struct afs_wait_mode afs_sync_call; 69 extern const struct afs_wait_mode afs_async_call; 70 71 /* 72 * a record of an in-progress RxRPC call 73 */ 74 struct afs_call { 75 const struct afs_call_type *type; /* type of call */ 76 const struct afs_wait_mode *wait_mode; /* completion wait mode */ 77 wait_queue_head_t waitq; /* processes awaiting completion */ 78 struct work_struct async_work; /* asynchronous work processor */ 79 struct work_struct work; /* actual work processor */ 80 struct sk_buff_head rx_queue; /* received packets */ 81 struct rxrpc_call *rxcall; /* RxRPC call handle */ 82 struct key *key; /* security for this call */ 83 struct afs_server *server; /* server affected by incoming CM call */ 84 void *request; /* request data (first part) */ 85 struct address_space *mapping; /* page set */ 86 struct afs_writeback *wb; /* writeback being performed */ 87 void *buffer; /* reply receive buffer */ 88 void *reply; /* reply buffer (first part) */ 89 void *reply2; /* reply buffer (second part) */ 90 void *reply3; /* reply buffer (third part) */ 91 void *reply4; /* reply buffer (fourth part) */ 92 pgoff_t first; /* first page in mapping to deal with */ 93 pgoff_t last; /* last page in mapping to deal with */ 94 enum { /* call state */ 95 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 96 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 97 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */ 98 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */ 99 AFS_CALL_REPLYING, /* replying to incoming call */ 100 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */ 101 AFS_CALL_COMPLETE, /* successfully completed */ 102 AFS_CALL_BUSY, /* server was busy */ 103 AFS_CALL_ABORTED, /* call was aborted */ 104 AFS_CALL_ERROR, /* call failed due to error */ 105 } state; 106 int error; /* error code */ 107 unsigned request_size; /* size of request data */ 108 unsigned reply_max; /* maximum size of reply */ 109 unsigned reply_size; /* current size of reply */ 110 unsigned first_offset; /* offset into mapping[first] */ 111 unsigned last_to; /* amount of mapping[last] */ 112 unsigned offset; /* offset into received data store */ 113 unsigned char unmarshall; /* unmarshalling phase */ 114 bool incoming; /* T if incoming call */ 115 bool send_pages; /* T if data from mapping should be sent */ 116 u16 service_id; /* RxRPC service ID to call */ 117 __be16 port; /* target UDP port */ 118 __be32 operation_ID; /* operation ID for an incoming call */ 119 u32 count; /* count for use in unmarshalling */ 120 __be32 tmp; /* place to extract temporary data */ 121 afs_dataversion_t store_version; /* updated version expected from store */ 122 }; 123 124 struct afs_call_type { 125 const char *name; 126 127 /* deliver request or reply data to an call 128 * - returning an error will cause the call to be aborted 129 */ 130 int (*deliver)(struct afs_call *call, struct sk_buff *skb, 131 bool last); 132 133 /* map an abort code to an error number */ 134 int (*abort_to_error)(u32 abort_code); 135 136 /* clean up a call */ 137 void (*destructor)(struct afs_call *call); 138 }; 139 140 /* 141 * record of an outstanding writeback on a vnode 142 */ 143 struct afs_writeback { 144 struct list_head link; /* link in vnode->writebacks */ 145 struct work_struct writer; /* work item to perform the writeback */ 146 struct afs_vnode *vnode; /* vnode to which this write applies */ 147 struct key *key; /* owner of this write */ 148 wait_queue_head_t waitq; /* completion and ready wait queue */ 149 pgoff_t first; /* first page in batch */ 150 pgoff_t point; /* last page in current store op */ 151 pgoff_t last; /* last page in batch (inclusive) */ 152 unsigned offset_first; /* offset into first page of start of write */ 153 unsigned to_last; /* offset into last page of end of write */ 154 int num_conflicts; /* count of conflicting writes in list */ 155 int usage; 156 bool conflicts; /* T if has dependent conflicts */ 157 enum { 158 AFS_WBACK_SYNCING, /* synchronisation being performed */ 159 AFS_WBACK_PENDING, /* write pending */ 160 AFS_WBACK_CONFLICTING, /* conflicting writes posted */ 161 AFS_WBACK_WRITING, /* writing back */ 162 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */ 163 } state __attribute__((packed)); 164 }; 165 166 /* 167 * AFS superblock private data 168 * - there's one superblock per volume 169 */ 170 struct afs_super_info { 171 struct afs_volume *volume; /* volume record */ 172 char rwparent; /* T if parent is R/W AFS volume */ 173 }; 174 175 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 176 { 177 return sb->s_fs_info; 178 } 179 180 extern struct file_system_type afs_fs_type; 181 182 /* 183 * entry in the cached cell catalogue 184 */ 185 struct afs_cache_cell { 186 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 187 struct in_addr vl_servers[15]; /* cached cell VL servers */ 188 }; 189 190 /* 191 * AFS cell record 192 */ 193 struct afs_cell { 194 atomic_t usage; 195 struct list_head link; /* main cell list link */ 196 struct key *anonymous_key; /* anonymous user key for this cell */ 197 struct list_head proc_link; /* /proc cell list link */ 198 #ifdef CONFIG_AFS_FSCACHE 199 struct fscache_cookie *cache; /* caching cookie */ 200 #endif 201 202 /* server record management */ 203 rwlock_t servers_lock; /* active server list lock */ 204 struct list_head servers; /* active server list */ 205 206 /* volume location record management */ 207 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 208 struct list_head vl_list; /* cell's active VL record list */ 209 spinlock_t vl_lock; /* vl_list lock */ 210 unsigned short vl_naddrs; /* number of VL servers in addr list */ 211 unsigned short vl_curr_svix; /* current server index */ 212 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 213 214 char name[0]; /* cell name - must go last */ 215 }; 216 217 /* 218 * entry in the cached volume location catalogue 219 */ 220 struct afs_cache_vlocation { 221 /* volume name (lowercase, padded with NULs) */ 222 uint8_t name[AFS_MAXVOLNAME + 1]; 223 224 uint8_t nservers; /* number of entries used in servers[] */ 225 uint8_t vidmask; /* voltype mask for vid[] */ 226 uint8_t srvtmask[8]; /* voltype masks for servers[] */ 227 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 228 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 229 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 230 231 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ 232 struct in_addr servers[8]; /* fileserver addresses */ 233 time_t rtime; /* last retrieval time */ 234 }; 235 236 /* 237 * volume -> vnode hash table entry 238 */ 239 struct afs_cache_vhash { 240 afs_voltype_t vtype; /* which volume variation */ 241 uint8_t hash_bucket; /* which hash bucket this represents */ 242 } __attribute__((packed)); 243 244 /* 245 * AFS volume location record 246 */ 247 struct afs_vlocation { 248 atomic_t usage; 249 time_t time_of_death; /* time at which put reduced usage to 0 */ 250 struct list_head link; /* link in cell volume location list */ 251 struct list_head grave; /* link in master graveyard list */ 252 struct list_head update; /* link in master update list */ 253 struct afs_cell *cell; /* cell to which volume belongs */ 254 #ifdef CONFIG_AFS_FSCACHE 255 struct fscache_cookie *cache; /* caching cookie */ 256 #endif 257 struct afs_cache_vlocation vldb; /* volume information DB record */ 258 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ 259 wait_queue_head_t waitq; /* status change waitqueue */ 260 time_t update_at; /* time at which record should be updated */ 261 spinlock_t lock; /* access lock */ 262 afs_vlocation_state_t state; /* volume location state */ 263 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ 264 unsigned short upd_busy_cnt; /* EBUSY count during update */ 265 bool valid; /* T if valid */ 266 }; 267 268 /* 269 * AFS fileserver record 270 */ 271 struct afs_server { 272 atomic_t usage; 273 time_t time_of_death; /* time at which put reduced usage to 0 */ 274 struct in_addr addr; /* server address */ 275 struct afs_cell *cell; /* cell in which server resides */ 276 struct list_head link; /* link in cell's server list */ 277 struct list_head grave; /* link in master graveyard list */ 278 struct rb_node master_rb; /* link in master by-addr tree */ 279 struct rw_semaphore sem; /* access lock */ 280 281 /* file service access */ 282 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */ 283 unsigned long fs_act_jif; /* time at which last activity occurred */ 284 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ 285 spinlock_t fs_lock; /* access lock */ 286 int fs_state; /* 0 or reason FS currently marked dead (-errno) */ 287 288 /* callback promise management */ 289 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */ 290 struct delayed_work cb_updater; /* callback updater */ 291 struct delayed_work cb_break_work; /* collected break dispatcher */ 292 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */ 293 spinlock_t cb_lock; /* access lock */ 294 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */ 295 atomic_t cb_break_n; /* number of pending breaks */ 296 u8 cb_break_head; /* head of callback breaking ring */ 297 u8 cb_break_tail; /* tail of callback breaking ring */ 298 }; 299 300 /* 301 * AFS volume access record 302 */ 303 struct afs_volume { 304 atomic_t usage; 305 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ 306 struct afs_vlocation *vlocation; /* volume location */ 307 #ifdef CONFIG_AFS_FSCACHE 308 struct fscache_cookie *cache; /* caching cookie */ 309 #endif 310 afs_volid_t vid; /* volume ID */ 311 afs_voltype_t type; /* type of volume */ 312 char type_force; /* force volume type (suppress R/O -> R/W) */ 313 unsigned short nservers; /* number of server slots filled */ 314 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ 315 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ 316 struct rw_semaphore server_sem; /* lock for accessing current server */ 317 struct backing_dev_info bdi; 318 }; 319 320 /* 321 * vnode catalogue entry 322 */ 323 struct afs_cache_vnode { 324 afs_vnodeid_t vnode_id; /* vnode ID */ 325 unsigned vnode_unique; /* vnode ID uniquifier */ 326 afs_dataversion_t data_version; /* data version */ 327 }; 328 329 /* 330 * AFS inode private data 331 */ 332 struct afs_vnode { 333 struct inode vfs_inode; /* the VFS's inode record */ 334 335 struct afs_volume *volume; /* volume on which vnode resides */ 336 struct afs_server *server; /* server currently supplying this file */ 337 struct afs_fid fid; /* the file identifier for this inode */ 338 struct afs_file_status status; /* AFS status info for this file */ 339 #ifdef CONFIG_AFS_FSCACHE 340 struct fscache_cookie *cache; /* caching cookie */ 341 #endif 342 struct afs_permits *permits; /* cache of permits so far obtained */ 343 struct mutex permits_lock; /* lock for altering permits list */ 344 struct mutex validate_lock; /* lock for validating this vnode */ 345 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 346 int update_cnt; /* number of outstanding ops that will update the 347 * status */ 348 spinlock_t writeback_lock; /* lock for writebacks */ 349 spinlock_t lock; /* waitqueue/flags lock */ 350 unsigned long flags; 351 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 352 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 353 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */ 354 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 355 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 356 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 357 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */ 358 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */ 359 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */ 360 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */ 361 #define AFS_VNODE_AUTOCELL 10 /* set if Vnode is an auto mount point */ 362 #define AFS_VNODE_PSEUDODIR 11 /* set if Vnode is a pseudo directory */ 363 364 long acl_order; /* ACL check count (callback break count) */ 365 366 struct list_head writebacks; /* alterations in pagecache that need writing */ 367 struct list_head pending_locks; /* locks waiting to be granted */ 368 struct list_head granted_locks; /* locks granted on this file */ 369 struct delayed_work lock_work; /* work to be done in locking */ 370 struct key *unlock_key; /* key to be used in unlocking */ 371 372 /* outstanding callback notification on this file */ 373 struct rb_node server_rb; /* link in server->fs_vnodes */ 374 struct rb_node cb_promise; /* link in server->cb_promises */ 375 struct work_struct cb_broken_work; /* work to be done on callback break */ 376 time_t cb_expires; /* time at which callback expires */ 377 time_t cb_expires_at; /* time used to order cb_promise */ 378 unsigned cb_version; /* callback version */ 379 unsigned cb_expiry; /* callback expiry time */ 380 afs_callback_type_t cb_type; /* type of callback */ 381 bool cb_promised; /* true if promise still holds */ 382 }; 383 384 /* 385 * cached security record for one user's attempt to access a vnode 386 */ 387 struct afs_permit { 388 struct key *key; /* RxRPC ticket holding a security context */ 389 afs_access_t access_mask; /* access mask for this key */ 390 }; 391 392 /* 393 * cache of security records from attempts to access a vnode 394 */ 395 struct afs_permits { 396 struct rcu_head rcu; /* disposal procedure */ 397 int count; /* number of records */ 398 struct afs_permit permits[0]; /* the permits so far examined */ 399 }; 400 401 /* 402 * record of one of a system's set of network interfaces 403 */ 404 struct afs_interface { 405 struct in_addr address; /* IPv4 address bound to interface */ 406 struct in_addr netmask; /* netmask applied to address */ 407 unsigned mtu; /* MTU of interface */ 408 }; 409 410 /* 411 * UUID definition [internet draft] 412 * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns 413 * increments since midnight 15th October 1582 414 * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID 415 * time 416 * - the clock sequence is a 14-bit counter to avoid duplicate times 417 */ 418 struct afs_uuid { 419 u32 time_low; /* low part of timestamp */ 420 u16 time_mid; /* mid part of timestamp */ 421 u16 time_hi_and_version; /* high part of timestamp and version */ 422 #define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL 423 #define AFS_UUID_TIMEHI_MASK 0x0fff 424 #define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */ 425 #define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */ 426 #define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */ 427 u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */ 428 #define AFS_UUID_CLOCKHI_MASK 0x3f 429 #define AFS_UUID_VARIANT_STD 0x80 430 u8 clock_seq_low; /* clock seq low */ 431 u8 node[6]; /* spatially unique node ID (MAC addr) */ 432 }; 433 434 /*****************************************************************************/ 435 /* 436 * cache.c 437 */ 438 #ifdef CONFIG_AFS_FSCACHE 439 extern struct fscache_netfs afs_cache_netfs; 440 extern struct fscache_cookie_def afs_cell_cache_index_def; 441 extern struct fscache_cookie_def afs_vlocation_cache_index_def; 442 extern struct fscache_cookie_def afs_volume_cache_index_def; 443 extern struct fscache_cookie_def afs_vnode_cache_index_def; 444 #else 445 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 446 #define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL) 447 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 448 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 449 #endif 450 451 /* 452 * callback.c 453 */ 454 extern void afs_init_callback_state(struct afs_server *); 455 extern void afs_broken_callback_work(struct work_struct *); 456 extern void afs_break_callbacks(struct afs_server *, size_t, 457 struct afs_callback[]); 458 extern void afs_discard_callback_on_delete(struct afs_vnode *); 459 extern void afs_give_up_callback(struct afs_vnode *); 460 extern void afs_dispatch_give_up_callbacks(struct work_struct *); 461 extern void afs_flush_callback_breaks(struct afs_server *); 462 extern int __init afs_callback_update_init(void); 463 extern void afs_callback_update_kill(void); 464 465 /* 466 * cell.c 467 */ 468 extern struct rw_semaphore afs_proc_cells_sem; 469 extern struct list_head afs_proc_cells; 470 471 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) 472 extern int afs_cell_init(char *); 473 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool); 474 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool); 475 extern struct afs_cell *afs_grab_cell(struct afs_cell *); 476 extern void afs_put_cell(struct afs_cell *); 477 extern void afs_cell_purge(void); 478 479 /* 480 * cmservice.c 481 */ 482 extern bool afs_cm_incoming_call(struct afs_call *); 483 484 /* 485 * dir.c 486 */ 487 extern const struct inode_operations afs_dir_inode_operations; 488 extern const struct dentry_operations afs_fs_dentry_operations; 489 extern const struct file_operations afs_dir_file_operations; 490 491 /* 492 * file.c 493 */ 494 extern const struct address_space_operations afs_fs_aops; 495 extern const struct inode_operations afs_file_inode_operations; 496 extern const struct file_operations afs_file_operations; 497 498 extern int afs_open(struct inode *, struct file *); 499 extern int afs_release(struct inode *, struct file *); 500 extern int afs_page_filler(void *, struct page *); 501 502 /* 503 * flock.c 504 */ 505 extern void __exit afs_kill_lock_manager(void); 506 extern void afs_lock_work(struct work_struct *); 507 extern void afs_lock_may_be_available(struct afs_vnode *); 508 extern int afs_lock(struct file *, int, struct file_lock *); 509 extern int afs_flock(struct file *, int, struct file_lock *); 510 511 /* 512 * fsclient.c 513 */ 514 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 515 struct afs_vnode *, struct afs_volsync *, 516 const struct afs_wait_mode *); 517 extern int afs_fs_give_up_callbacks(struct afs_server *, 518 const struct afs_wait_mode *); 519 extern int afs_fs_fetch_data(struct afs_server *, struct key *, 520 struct afs_vnode *, off_t, size_t, struct page *, 521 const struct afs_wait_mode *); 522 extern int afs_fs_create(struct afs_server *, struct key *, 523 struct afs_vnode *, const char *, umode_t, 524 struct afs_fid *, struct afs_file_status *, 525 struct afs_callback *, 526 const struct afs_wait_mode *); 527 extern int afs_fs_remove(struct afs_server *, struct key *, 528 struct afs_vnode *, const char *, bool, 529 const struct afs_wait_mode *); 530 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 531 struct afs_vnode *, const char *, 532 const struct afs_wait_mode *); 533 extern int afs_fs_symlink(struct afs_server *, struct key *, 534 struct afs_vnode *, const char *, const char *, 535 struct afs_fid *, struct afs_file_status *, 536 const struct afs_wait_mode *); 537 extern int afs_fs_rename(struct afs_server *, struct key *, 538 struct afs_vnode *, const char *, 539 struct afs_vnode *, const char *, 540 const struct afs_wait_mode *); 541 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *, 542 pgoff_t, pgoff_t, unsigned, unsigned, 543 const struct afs_wait_mode *); 544 extern int afs_fs_setattr(struct afs_server *, struct key *, 545 struct afs_vnode *, struct iattr *, 546 const struct afs_wait_mode *); 547 extern int afs_fs_get_volume_status(struct afs_server *, struct key *, 548 struct afs_vnode *, 549 struct afs_volume_status *, 550 const struct afs_wait_mode *); 551 extern int afs_fs_set_lock(struct afs_server *, struct key *, 552 struct afs_vnode *, afs_lock_type_t, 553 const struct afs_wait_mode *); 554 extern int afs_fs_extend_lock(struct afs_server *, struct key *, 555 struct afs_vnode *, 556 const struct afs_wait_mode *); 557 extern int afs_fs_release_lock(struct afs_server *, struct key *, 558 struct afs_vnode *, 559 const struct afs_wait_mode *); 560 561 /* 562 * inode.c 563 */ 564 extern struct inode *afs_iget_autocell(struct inode *, const char *, int, 565 struct key *); 566 extern struct inode *afs_iget(struct super_block *, struct key *, 567 struct afs_fid *, struct afs_file_status *, 568 struct afs_callback *); 569 extern void afs_zap_data(struct afs_vnode *); 570 extern int afs_validate(struct afs_vnode *, struct key *); 571 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 572 extern int afs_setattr(struct dentry *, struct iattr *); 573 extern void afs_evict_inode(struct inode *); 574 extern int afs_drop_inode(struct inode *); 575 576 /* 577 * main.c 578 */ 579 extern struct workqueue_struct *afs_wq; 580 extern struct afs_uuid afs_uuid; 581 582 /* 583 * misc.c 584 */ 585 extern int afs_abort_to_error(u32); 586 587 /* 588 * mntpt.c 589 */ 590 extern const struct inode_operations afs_mntpt_inode_operations; 591 extern const struct inode_operations afs_autocell_inode_operations; 592 extern const struct file_operations afs_mntpt_file_operations; 593 594 extern struct vfsmount *afs_d_automount(struct path *); 595 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *); 596 extern void afs_mntpt_kill_timer(void); 597 598 /* 599 * proc.c 600 */ 601 extern int afs_proc_init(void); 602 extern void afs_proc_cleanup(void); 603 extern int afs_proc_cell_setup(struct afs_cell *); 604 extern void afs_proc_cell_remove(struct afs_cell *); 605 606 /* 607 * rxrpc.c 608 */ 609 extern int afs_open_socket(void); 610 extern void afs_close_socket(void); 611 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, 612 const struct afs_wait_mode *); 613 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 614 size_t, size_t); 615 extern void afs_flat_call_destructor(struct afs_call *); 616 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *); 617 extern void afs_send_empty_reply(struct afs_call *); 618 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 619 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *, 620 size_t); 621 622 /* 623 * security.c 624 */ 625 extern void afs_clear_permits(struct afs_vnode *); 626 extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 627 extern void afs_zap_permits(struct rcu_head *); 628 extern struct key *afs_request_key(struct afs_cell *); 629 extern int afs_permission(struct inode *, int); 630 631 /* 632 * server.c 633 */ 634 extern spinlock_t afs_server_peer_lock; 635 636 #define afs_get_server(S) \ 637 do { \ 638 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 639 atomic_inc(&(S)->usage); \ 640 } while(0) 641 642 extern struct afs_server *afs_lookup_server(struct afs_cell *, 643 const struct in_addr *); 644 extern struct afs_server *afs_find_server(const struct in_addr *); 645 extern void afs_put_server(struct afs_server *); 646 extern void __exit afs_purge_servers(void); 647 648 /* 649 * super.c 650 */ 651 extern int afs_fs_init(void); 652 extern void afs_fs_exit(void); 653 654 /* 655 * use-rtnetlink.c 656 */ 657 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 658 extern int afs_get_MAC_address(u8 *, size_t); 659 660 /* 661 * vlclient.c 662 */ 663 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 664 const char *, struct afs_cache_vlocation *, 665 const struct afs_wait_mode *); 666 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 667 afs_volid_t, afs_voltype_t, 668 struct afs_cache_vlocation *, 669 const struct afs_wait_mode *); 670 671 /* 672 * vlocation.c 673 */ 674 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 675 676 extern int __init afs_vlocation_update_init(void); 677 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 678 struct key *, 679 const char *, size_t); 680 extern void afs_put_vlocation(struct afs_vlocation *); 681 extern void afs_vlocation_purge(void); 682 683 /* 684 * vnode.c 685 */ 686 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 687 { 688 return container_of(inode, struct afs_vnode, vfs_inode); 689 } 690 691 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 692 { 693 return &vnode->vfs_inode; 694 } 695 696 extern void afs_vnode_finalise_status_update(struct afs_vnode *, 697 struct afs_server *); 698 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 699 struct key *); 700 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 701 off_t, size_t, struct page *); 702 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 703 umode_t, struct afs_fid *, struct afs_file_status *, 704 struct afs_callback *, struct afs_server **); 705 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 706 bool); 707 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 708 const char *); 709 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 710 const char *, struct afs_fid *, 711 struct afs_file_status *, struct afs_server **); 712 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 713 struct key *, const char *, const char *); 714 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t, 715 unsigned, unsigned); 716 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *); 717 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *, 718 struct afs_volume_status *); 719 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *, 720 afs_lock_type_t); 721 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *); 722 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *); 723 724 /* 725 * volume.c 726 */ 727 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 728 729 extern void afs_put_volume(struct afs_volume *); 730 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 731 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 732 extern int afs_volume_release_fileserver(struct afs_vnode *, 733 struct afs_server *, int); 734 735 /* 736 * write.c 737 */ 738 extern int afs_set_page_dirty(struct page *); 739 extern void afs_put_writeback(struct afs_writeback *); 740 extern int afs_write_begin(struct file *file, struct address_space *mapping, 741 loff_t pos, unsigned len, unsigned flags, 742 struct page **pagep, void **fsdata); 743 extern int afs_write_end(struct file *file, struct address_space *mapping, 744 loff_t pos, unsigned len, unsigned copied, 745 struct page *page, void *fsdata); 746 extern int afs_writepage(struct page *, struct writeback_control *); 747 extern int afs_writepages(struct address_space *, struct writeback_control *); 748 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 749 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *, 750 unsigned long, loff_t); 751 extern int afs_writeback_all(struct afs_vnode *); 752 extern int afs_fsync(struct file *, loff_t, loff_t, int); 753 754 755 /*****************************************************************************/ 756 /* 757 * debug tracing 758 */ 759 extern unsigned afs_debug; 760 761 #define dbgprintk(FMT,...) \ 762 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 763 764 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 765 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 766 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 767 768 769 #if defined(__KDEBUG) 770 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 771 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 772 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 773 774 #elif defined(CONFIG_AFS_DEBUG) 775 #define AFS_DEBUG_KENTER 0x01 776 #define AFS_DEBUG_KLEAVE 0x02 777 #define AFS_DEBUG_KDEBUG 0x04 778 779 #define _enter(FMT,...) \ 780 do { \ 781 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 782 kenter(FMT,##__VA_ARGS__); \ 783 } while (0) 784 785 #define _leave(FMT,...) \ 786 do { \ 787 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 788 kleave(FMT,##__VA_ARGS__); \ 789 } while (0) 790 791 #define _debug(FMT,...) \ 792 do { \ 793 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 794 kdebug(FMT,##__VA_ARGS__); \ 795 } while (0) 796 797 #else 798 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 799 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 800 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 801 #endif 802 803 /* 804 * debug assertion checking 805 */ 806 #if 1 // defined(__KDEBUGALL) 807 808 #define ASSERT(X) \ 809 do { \ 810 if (unlikely(!(X))) { \ 811 printk(KERN_ERR "\n"); \ 812 printk(KERN_ERR "AFS: Assertion failed\n"); \ 813 BUG(); \ 814 } \ 815 } while(0) 816 817 #define ASSERTCMP(X, OP, Y) \ 818 do { \ 819 if (unlikely(!((X) OP (Y)))) { \ 820 printk(KERN_ERR "\n"); \ 821 printk(KERN_ERR "AFS: Assertion failed\n"); \ 822 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 823 (unsigned long)(X), (unsigned long)(Y)); \ 824 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 825 (unsigned long)(X), (unsigned long)(Y)); \ 826 BUG(); \ 827 } \ 828 } while(0) 829 830 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 831 do { \ 832 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 833 printk(KERN_ERR "\n"); \ 834 printk(KERN_ERR "AFS: Assertion failed\n"); \ 835 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 836 (unsigned long)(L), (unsigned long)(N), \ 837 (unsigned long)(H)); \ 838 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 839 (unsigned long)(L), (unsigned long)(N), \ 840 (unsigned long)(H)); \ 841 BUG(); \ 842 } \ 843 } while(0) 844 845 #define ASSERTIF(C, X) \ 846 do { \ 847 if (unlikely((C) && !(X))) { \ 848 printk(KERN_ERR "\n"); \ 849 printk(KERN_ERR "AFS: Assertion failed\n"); \ 850 BUG(); \ 851 } \ 852 } while(0) 853 854 #define ASSERTIFCMP(C, X, OP, Y) \ 855 do { \ 856 if (unlikely((C) && !((X) OP (Y)))) { \ 857 printk(KERN_ERR "\n"); \ 858 printk(KERN_ERR "AFS: Assertion failed\n"); \ 859 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 860 (unsigned long)(X), (unsigned long)(Y)); \ 861 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 862 (unsigned long)(X), (unsigned long)(Y)); \ 863 BUG(); \ 864 } \ 865 } while(0) 866 867 #else 868 869 #define ASSERT(X) \ 870 do { \ 871 } while(0) 872 873 #define ASSERTCMP(X, OP, Y) \ 874 do { \ 875 } while(0) 876 877 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 878 do { \ 879 } while(0) 880 881 #define ASSERTIF(C, X) \ 882 do { \ 883 } while(0) 884 885 #define ASSERTIFCMP(C, X, OP, Y) \ 886 do { \ 887 } while(0) 888 889 #endif /* __KDEBUGALL */ 890