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 short 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 struct proc_dir_entry *proc_dir; /* /proc dir for this cell */ 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 * UUID definition [internet draft] 413 * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns 414 * increments since midnight 15th October 1582 415 * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID 416 * time 417 * - the clock sequence is a 14-bit counter to avoid duplicate times 418 */ 419 struct afs_uuid { 420 u32 time_low; /* low part of timestamp */ 421 u16 time_mid; /* mid part of timestamp */ 422 u16 time_hi_and_version; /* high part of timestamp and version */ 423 #define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL 424 #define AFS_UUID_TIMEHI_MASK 0x0fff 425 #define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */ 426 #define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */ 427 #define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */ 428 u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */ 429 #define AFS_UUID_CLOCKHI_MASK 0x3f 430 #define AFS_UUID_VARIANT_STD 0x80 431 u8 clock_seq_low; /* clock seq low */ 432 u8 node[6]; /* spatially unique node ID (MAC addr) */ 433 }; 434 435 /*****************************************************************************/ 436 /* 437 * cache.c 438 */ 439 #ifdef CONFIG_AFS_FSCACHE 440 extern struct fscache_netfs afs_cache_netfs; 441 extern struct fscache_cookie_def afs_cell_cache_index_def; 442 extern struct fscache_cookie_def afs_vlocation_cache_index_def; 443 extern struct fscache_cookie_def afs_volume_cache_index_def; 444 extern struct fscache_cookie_def afs_vnode_cache_index_def; 445 #else 446 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 447 #define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL) 448 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 449 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 450 #endif 451 452 /* 453 * callback.c 454 */ 455 extern void afs_init_callback_state(struct afs_server *); 456 extern void afs_broken_callback_work(struct work_struct *); 457 extern void afs_break_callbacks(struct afs_server *, size_t, 458 struct afs_callback[]); 459 extern void afs_discard_callback_on_delete(struct afs_vnode *); 460 extern void afs_give_up_callback(struct afs_vnode *); 461 extern void afs_dispatch_give_up_callbacks(struct work_struct *); 462 extern void afs_flush_callback_breaks(struct afs_server *); 463 extern int __init afs_callback_update_init(void); 464 extern void afs_callback_update_kill(void); 465 466 /* 467 * cell.c 468 */ 469 extern struct rw_semaphore afs_proc_cells_sem; 470 extern struct list_head afs_proc_cells; 471 472 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) 473 extern int afs_cell_init(char *); 474 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool); 475 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool); 476 extern struct afs_cell *afs_grab_cell(struct afs_cell *); 477 extern void afs_put_cell(struct afs_cell *); 478 extern void afs_cell_purge(void); 479 480 /* 481 * cmservice.c 482 */ 483 extern bool afs_cm_incoming_call(struct afs_call *); 484 485 /* 486 * dir.c 487 */ 488 extern const struct inode_operations afs_dir_inode_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 afs_uuid afs_uuid; 580 581 /* 582 * misc.c 583 */ 584 extern int afs_abort_to_error(u32); 585 586 /* 587 * mntpt.c 588 */ 589 extern const struct inode_operations afs_mntpt_inode_operations; 590 extern const struct inode_operations afs_autocell_inode_operations; 591 extern const struct file_operations afs_mntpt_file_operations; 592 593 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *); 594 extern void afs_mntpt_kill_timer(void); 595 596 /* 597 * proc.c 598 */ 599 extern int afs_proc_init(void); 600 extern void afs_proc_cleanup(void); 601 extern int afs_proc_cell_setup(struct afs_cell *); 602 extern void afs_proc_cell_remove(struct afs_cell *); 603 604 /* 605 * rxrpc.c 606 */ 607 extern int afs_open_socket(void); 608 extern void afs_close_socket(void); 609 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, 610 const struct afs_wait_mode *); 611 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 612 size_t, size_t); 613 extern void afs_flat_call_destructor(struct afs_call *); 614 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *); 615 extern void afs_send_empty_reply(struct afs_call *); 616 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 617 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *, 618 size_t); 619 620 /* 621 * security.c 622 */ 623 extern void afs_clear_permits(struct afs_vnode *); 624 extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 625 extern void afs_zap_permits(struct rcu_head *); 626 extern struct key *afs_request_key(struct afs_cell *); 627 extern int afs_permission(struct inode *, int); 628 629 /* 630 * server.c 631 */ 632 extern spinlock_t afs_server_peer_lock; 633 634 #define afs_get_server(S) \ 635 do { \ 636 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 637 atomic_inc(&(S)->usage); \ 638 } while(0) 639 640 extern struct afs_server *afs_lookup_server(struct afs_cell *, 641 const struct in_addr *); 642 extern struct afs_server *afs_find_server(const struct in_addr *); 643 extern void afs_put_server(struct afs_server *); 644 extern void __exit afs_purge_servers(void); 645 646 /* 647 * super.c 648 */ 649 extern int afs_fs_init(void); 650 extern void afs_fs_exit(void); 651 652 /* 653 * use-rtnetlink.c 654 */ 655 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 656 extern int afs_get_MAC_address(u8 *, size_t); 657 658 /* 659 * vlclient.c 660 */ 661 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 662 const char *, struct afs_cache_vlocation *, 663 const struct afs_wait_mode *); 664 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 665 afs_volid_t, afs_voltype_t, 666 struct afs_cache_vlocation *, 667 const struct afs_wait_mode *); 668 669 /* 670 * vlocation.c 671 */ 672 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 673 674 extern int __init afs_vlocation_update_init(void); 675 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 676 struct key *, 677 const char *, size_t); 678 extern void afs_put_vlocation(struct afs_vlocation *); 679 extern void afs_vlocation_purge(void); 680 681 /* 682 * vnode.c 683 */ 684 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 685 { 686 return container_of(inode, struct afs_vnode, vfs_inode); 687 } 688 689 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 690 { 691 return &vnode->vfs_inode; 692 } 693 694 extern void afs_vnode_finalise_status_update(struct afs_vnode *, 695 struct afs_server *); 696 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 697 struct key *); 698 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 699 off_t, size_t, struct page *); 700 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 701 umode_t, struct afs_fid *, struct afs_file_status *, 702 struct afs_callback *, struct afs_server **); 703 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 704 bool); 705 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 706 const char *); 707 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 708 const char *, struct afs_fid *, 709 struct afs_file_status *, struct afs_server **); 710 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 711 struct key *, const char *, const char *); 712 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t, 713 unsigned, unsigned); 714 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *); 715 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *, 716 struct afs_volume_status *); 717 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *, 718 afs_lock_type_t); 719 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *); 720 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *); 721 722 /* 723 * volume.c 724 */ 725 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 726 727 extern void afs_put_volume(struct afs_volume *); 728 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 729 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 730 extern int afs_volume_release_fileserver(struct afs_vnode *, 731 struct afs_server *, int); 732 733 /* 734 * write.c 735 */ 736 extern int afs_set_page_dirty(struct page *); 737 extern void afs_put_writeback(struct afs_writeback *); 738 extern int afs_write_begin(struct file *file, struct address_space *mapping, 739 loff_t pos, unsigned len, unsigned flags, 740 struct page **pagep, void **fsdata); 741 extern int afs_write_end(struct file *file, struct address_space *mapping, 742 loff_t pos, unsigned len, unsigned copied, 743 struct page *page, void *fsdata); 744 extern int afs_writepage(struct page *, struct writeback_control *); 745 extern int afs_writepages(struct address_space *, struct writeback_control *); 746 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 747 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *, 748 unsigned long, loff_t); 749 extern int afs_writeback_all(struct afs_vnode *); 750 extern int afs_fsync(struct file *, int); 751 752 753 /*****************************************************************************/ 754 /* 755 * debug tracing 756 */ 757 extern unsigned afs_debug; 758 759 #define dbgprintk(FMT,...) \ 760 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 761 762 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 763 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 764 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 765 766 767 #if defined(__KDEBUG) 768 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 769 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 770 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 771 772 #elif defined(CONFIG_AFS_DEBUG) 773 #define AFS_DEBUG_KENTER 0x01 774 #define AFS_DEBUG_KLEAVE 0x02 775 #define AFS_DEBUG_KDEBUG 0x04 776 777 #define _enter(FMT,...) \ 778 do { \ 779 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 780 kenter(FMT,##__VA_ARGS__); \ 781 } while (0) 782 783 #define _leave(FMT,...) \ 784 do { \ 785 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 786 kleave(FMT,##__VA_ARGS__); \ 787 } while (0) 788 789 #define _debug(FMT,...) \ 790 do { \ 791 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 792 kdebug(FMT,##__VA_ARGS__); \ 793 } while (0) 794 795 #else 796 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 797 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 798 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 799 #endif 800 801 /* 802 * debug assertion checking 803 */ 804 #if 1 // defined(__KDEBUGALL) 805 806 #define ASSERT(X) \ 807 do { \ 808 if (unlikely(!(X))) { \ 809 printk(KERN_ERR "\n"); \ 810 printk(KERN_ERR "AFS: Assertion failed\n"); \ 811 BUG(); \ 812 } \ 813 } while(0) 814 815 #define ASSERTCMP(X, OP, Y) \ 816 do { \ 817 if (unlikely(!((X) OP (Y)))) { \ 818 printk(KERN_ERR "\n"); \ 819 printk(KERN_ERR "AFS: Assertion failed\n"); \ 820 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 821 (unsigned long)(X), (unsigned long)(Y)); \ 822 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 823 (unsigned long)(X), (unsigned long)(Y)); \ 824 BUG(); \ 825 } \ 826 } while(0) 827 828 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 829 do { \ 830 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 831 printk(KERN_ERR "\n"); \ 832 printk(KERN_ERR "AFS: Assertion failed\n"); \ 833 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 834 (unsigned long)(L), (unsigned long)(N), \ 835 (unsigned long)(H)); \ 836 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 837 (unsigned long)(L), (unsigned long)(N), \ 838 (unsigned long)(H)); \ 839 BUG(); \ 840 } \ 841 } while(0) 842 843 #define ASSERTIF(C, X) \ 844 do { \ 845 if (unlikely((C) && !(X))) { \ 846 printk(KERN_ERR "\n"); \ 847 printk(KERN_ERR "AFS: Assertion failed\n"); \ 848 BUG(); \ 849 } \ 850 } while(0) 851 852 #define ASSERTIFCMP(C, X, OP, Y) \ 853 do { \ 854 if (unlikely((C) && !((X) OP (Y)))) { \ 855 printk(KERN_ERR "\n"); \ 856 printk(KERN_ERR "AFS: Assertion failed\n"); \ 857 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 858 (unsigned long)(X), (unsigned long)(Y)); \ 859 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 860 (unsigned long)(X), (unsigned long)(Y)); \ 861 BUG(); \ 862 } \ 863 } while(0) 864 865 #else 866 867 #define ASSERT(X) \ 868 do { \ 869 } while(0) 870 871 #define ASSERTCMP(X, OP, Y) \ 872 do { \ 873 } while(0) 874 875 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 876 do { \ 877 } while(0) 878 879 #define ASSERTIF(C, X) \ 880 do { \ 881 } while(0) 882 883 #define ASSERTIFCMP(C, X, OP, Y) \ 884 do { \ 885 } while(0) 886 887 #endif /* __KDEBUGALL */ 888