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