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 void (*async_workfn)(struct afs_call *call); /* asynchronous work function */ 79 struct work_struct async_work; /* asynchronous work processor */ 80 struct work_struct work; /* actual work processor */ 81 struct sk_buff_head rx_queue; /* received packets */ 82 struct rxrpc_call *rxcall; /* RxRPC call handle */ 83 struct key *key; /* security for this call */ 84 struct afs_server *server; /* server affected by incoming CM call */ 85 void *request; /* request data (first part) */ 86 struct address_space *mapping; /* page set */ 87 struct afs_writeback *wb; /* writeback being performed */ 88 void *buffer; /* reply receive buffer */ 89 void *reply; /* reply buffer (first part) */ 90 void *reply2; /* reply buffer (second part) */ 91 void *reply3; /* reply buffer (third part) */ 92 void *reply4; /* reply buffer (fourth part) */ 93 pgoff_t first; /* first page in mapping to deal with */ 94 pgoff_t last; /* last page in mapping to deal with */ 95 enum { /* call state */ 96 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 97 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 98 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */ 99 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */ 100 AFS_CALL_REPLYING, /* replying to incoming call */ 101 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */ 102 AFS_CALL_COMPLETE, /* successfully completed */ 103 AFS_CALL_BUSY, /* server was busy */ 104 AFS_CALL_ABORTED, /* call was aborted */ 105 AFS_CALL_ERROR, /* call failed due to error */ 106 } state; 107 int error; /* error code */ 108 unsigned request_size; /* size of request data */ 109 unsigned reply_max; /* maximum size of reply */ 110 unsigned reply_size; /* current size of reply */ 111 unsigned first_offset; /* offset into mapping[first] */ 112 unsigned last_to; /* amount of mapping[last] */ 113 unsigned offset; /* offset into received data store */ 114 unsigned char unmarshall; /* unmarshalling phase */ 115 bool incoming; /* T if incoming call */ 116 bool send_pages; /* T if data from mapping should be sent */ 117 u16 service_id; /* RxRPC service ID to call */ 118 __be16 port; /* target UDP port */ 119 __be32 operation_ID; /* operation ID for an incoming call */ 120 u32 count; /* count for use in unmarshalling */ 121 __be32 tmp; /* place to extract temporary data */ 122 afs_dataversion_t store_version; /* updated version expected from store */ 123 }; 124 125 struct afs_call_type { 126 const char *name; 127 128 /* deliver request or reply data to an call 129 * - returning an error will cause the call to be aborted 130 */ 131 int (*deliver)(struct afs_call *call, struct sk_buff *skb, 132 bool last); 133 134 /* map an abort code to an error number */ 135 int (*abort_to_error)(u32 abort_code); 136 137 /* clean up a call */ 138 void (*destructor)(struct afs_call *call); 139 }; 140 141 /* 142 * record of an outstanding writeback on a vnode 143 */ 144 struct afs_writeback { 145 struct list_head link; /* link in vnode->writebacks */ 146 struct work_struct writer; /* work item to perform the writeback */ 147 struct afs_vnode *vnode; /* vnode to which this write applies */ 148 struct key *key; /* owner of this write */ 149 wait_queue_head_t waitq; /* completion and ready wait queue */ 150 pgoff_t first; /* first page in batch */ 151 pgoff_t point; /* last page in current store op */ 152 pgoff_t last; /* last page in batch (inclusive) */ 153 unsigned offset_first; /* offset into first page of start of write */ 154 unsigned to_last; /* offset into last page of end of write */ 155 int num_conflicts; /* count of conflicting writes in list */ 156 int usage; 157 bool conflicts; /* T if has dependent conflicts */ 158 enum { 159 AFS_WBACK_SYNCING, /* synchronisation being performed */ 160 AFS_WBACK_PENDING, /* write pending */ 161 AFS_WBACK_CONFLICTING, /* conflicting writes posted */ 162 AFS_WBACK_WRITING, /* writing back */ 163 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */ 164 } state __attribute__((packed)); 165 }; 166 167 /* 168 * AFS superblock private data 169 * - there's one superblock per volume 170 */ 171 struct afs_super_info { 172 struct afs_volume *volume; /* volume record */ 173 char rwparent; /* T if parent is R/W AFS volume */ 174 }; 175 176 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 177 { 178 return sb->s_fs_info; 179 } 180 181 extern struct file_system_type afs_fs_type; 182 183 /* 184 * entry in the cached cell catalogue 185 */ 186 struct afs_cache_cell { 187 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 188 struct in_addr vl_servers[15]; /* cached cell VL servers */ 189 }; 190 191 /* 192 * AFS cell record 193 */ 194 struct afs_cell { 195 atomic_t usage; 196 struct list_head link; /* main cell list link */ 197 struct key *anonymous_key; /* anonymous user key for this cell */ 198 struct list_head proc_link; /* /proc cell list link */ 199 #ifdef CONFIG_AFS_FSCACHE 200 struct fscache_cookie *cache; /* caching cookie */ 201 #endif 202 203 /* server record management */ 204 rwlock_t servers_lock; /* active server list lock */ 205 struct list_head servers; /* active server list */ 206 207 /* volume location record management */ 208 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 209 struct list_head vl_list; /* cell's active VL record list */ 210 spinlock_t vl_lock; /* vl_list lock */ 211 unsigned short vl_naddrs; /* number of VL servers in addr list */ 212 unsigned short vl_curr_svix; /* current server index */ 213 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 214 215 char name[0]; /* cell name - must go last */ 216 }; 217 218 /* 219 * entry in the cached volume location catalogue 220 */ 221 struct afs_cache_vlocation { 222 /* volume name (lowercase, padded with NULs) */ 223 uint8_t name[AFS_MAXVOLNAME + 1]; 224 225 uint8_t nservers; /* number of entries used in servers[] */ 226 uint8_t vidmask; /* voltype mask for vid[] */ 227 uint8_t srvtmask[8]; /* voltype masks for servers[] */ 228 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 229 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 230 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 231 232 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ 233 struct in_addr servers[8]; /* fileserver addresses */ 234 time_t rtime; /* last retrieval time */ 235 }; 236 237 /* 238 * volume -> vnode hash table entry 239 */ 240 struct afs_cache_vhash { 241 afs_voltype_t vtype; /* which volume variation */ 242 uint8_t hash_bucket; /* which hash bucket this represents */ 243 } __attribute__((packed)); 244 245 /* 246 * AFS volume location record 247 */ 248 struct afs_vlocation { 249 atomic_t usage; 250 time_t time_of_death; /* time at which put reduced usage to 0 */ 251 struct list_head link; /* link in cell volume location list */ 252 struct list_head grave; /* link in master graveyard list */ 253 struct list_head update; /* link in master update list */ 254 struct afs_cell *cell; /* cell to which volume belongs */ 255 #ifdef CONFIG_AFS_FSCACHE 256 struct fscache_cookie *cache; /* caching cookie */ 257 #endif 258 struct afs_cache_vlocation vldb; /* volume information DB record */ 259 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ 260 wait_queue_head_t waitq; /* status change waitqueue */ 261 time_t update_at; /* time at which record should be updated */ 262 spinlock_t lock; /* access lock */ 263 afs_vlocation_state_t state; /* volume location state */ 264 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ 265 unsigned short upd_busy_cnt; /* EBUSY count during update */ 266 bool valid; /* T if valid */ 267 }; 268 269 /* 270 * AFS fileserver record 271 */ 272 struct afs_server { 273 atomic_t usage; 274 time_t time_of_death; /* time at which put reduced usage to 0 */ 275 struct in_addr addr; /* server address */ 276 struct afs_cell *cell; /* cell in which server resides */ 277 struct list_head link; /* link in cell's server list */ 278 struct list_head grave; /* link in master graveyard list */ 279 struct rb_node master_rb; /* link in master by-addr tree */ 280 struct rw_semaphore sem; /* access lock */ 281 282 /* file service access */ 283 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */ 284 unsigned long fs_act_jif; /* time at which last activity occurred */ 285 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ 286 spinlock_t fs_lock; /* access lock */ 287 int fs_state; /* 0 or reason FS currently marked dead (-errno) */ 288 289 /* callback promise management */ 290 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */ 291 struct delayed_work cb_updater; /* callback updater */ 292 struct delayed_work cb_break_work; /* collected break dispatcher */ 293 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */ 294 spinlock_t cb_lock; /* access lock */ 295 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */ 296 atomic_t cb_break_n; /* number of pending breaks */ 297 u8 cb_break_head; /* head of callback breaking ring */ 298 u8 cb_break_tail; /* tail of callback breaking ring */ 299 }; 300 301 /* 302 * AFS volume access record 303 */ 304 struct afs_volume { 305 atomic_t usage; 306 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ 307 struct afs_vlocation *vlocation; /* volume location */ 308 #ifdef CONFIG_AFS_FSCACHE 309 struct fscache_cookie *cache; /* caching cookie */ 310 #endif 311 afs_volid_t vid; /* volume ID */ 312 afs_voltype_t type; /* type of volume */ 313 char type_force; /* force volume type (suppress R/O -> R/W) */ 314 unsigned short nservers; /* number of server slots filled */ 315 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ 316 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ 317 struct rw_semaphore server_sem; /* lock for accessing current server */ 318 struct backing_dev_info bdi; 319 }; 320 321 /* 322 * vnode catalogue entry 323 */ 324 struct afs_cache_vnode { 325 afs_vnodeid_t vnode_id; /* vnode ID */ 326 unsigned vnode_unique; /* vnode ID uniquifier */ 327 afs_dataversion_t data_version; /* data version */ 328 }; 329 330 /* 331 * AFS inode private data 332 */ 333 struct afs_vnode { 334 struct inode vfs_inode; /* the VFS's inode record */ 335 336 struct afs_volume *volume; /* volume on which vnode resides */ 337 struct afs_server *server; /* server currently supplying this file */ 338 struct afs_fid fid; /* the file identifier for this inode */ 339 struct afs_file_status status; /* AFS status info for this file */ 340 #ifdef CONFIG_AFS_FSCACHE 341 struct fscache_cookie *cache; /* caching cookie */ 342 #endif 343 struct afs_permits *permits; /* cache of permits so far obtained */ 344 struct mutex permits_lock; /* lock for altering permits list */ 345 struct mutex validate_lock; /* lock for validating this vnode */ 346 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 347 int update_cnt; /* number of outstanding ops that will update the 348 * status */ 349 spinlock_t writeback_lock; /* lock for writebacks */ 350 spinlock_t lock; /* waitqueue/flags lock */ 351 unsigned long flags; 352 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 353 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 354 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */ 355 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 356 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 357 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 358 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */ 359 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */ 360 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */ 361 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */ 362 #define AFS_VNODE_AUTOCELL 10 /* set if Vnode is an auto mount point */ 363 #define AFS_VNODE_PSEUDODIR 11 /* set if Vnode is a pseudo directory */ 364 365 long acl_order; /* ACL check count (callback break count) */ 366 367 struct list_head writebacks; /* alterations in pagecache that need writing */ 368 struct list_head pending_locks; /* locks waiting to be granted */ 369 struct list_head granted_locks; /* locks granted on this file */ 370 struct delayed_work lock_work; /* work to be done in locking */ 371 struct key *unlock_key; /* key to be used in unlocking */ 372 373 /* outstanding callback notification on this file */ 374 struct rb_node server_rb; /* link in server->fs_vnodes */ 375 struct rb_node cb_promise; /* link in server->cb_promises */ 376 struct work_struct cb_broken_work; /* work to be done on callback break */ 377 time_t cb_expires; /* time at which callback expires */ 378 time_t cb_expires_at; /* time used to order cb_promise */ 379 unsigned cb_version; /* callback version */ 380 unsigned cb_expiry; /* callback expiry time */ 381 afs_callback_type_t cb_type; /* type of callback */ 382 bool cb_promised; /* true if promise still holds */ 383 }; 384 385 /* 386 * cached security record for one user's attempt to access a vnode 387 */ 388 struct afs_permit { 389 struct key *key; /* RxRPC ticket holding a security context */ 390 afs_access_t access_mask; /* access mask for this key */ 391 }; 392 393 /* 394 * cache of security records from attempts to access a vnode 395 */ 396 struct afs_permits { 397 struct rcu_head rcu; /* disposal procedure */ 398 int count; /* number of records */ 399 struct afs_permit permits[0]; /* the permits so far examined */ 400 }; 401 402 /* 403 * record of one of a system's set of network interfaces 404 */ 405 struct afs_interface { 406 struct in_addr address; /* IPv4 address bound to interface */ 407 struct in_addr netmask; /* netmask applied to address */ 408 unsigned mtu; /* MTU of interface */ 409 }; 410 411 /* 412 * 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 dentry_operations afs_fs_dentry_operations; 490 extern const struct file_operations afs_dir_file_operations; 491 492 /* 493 * file.c 494 */ 495 extern const struct address_space_operations afs_fs_aops; 496 extern const struct inode_operations afs_file_inode_operations; 497 extern const struct file_operations afs_file_operations; 498 499 extern int afs_open(struct inode *, struct file *); 500 extern int afs_release(struct inode *, struct file *); 501 extern int afs_page_filler(void *, struct page *); 502 503 /* 504 * flock.c 505 */ 506 extern void __exit afs_kill_lock_manager(void); 507 extern void afs_lock_work(struct work_struct *); 508 extern void afs_lock_may_be_available(struct afs_vnode *); 509 extern int afs_lock(struct file *, int, struct file_lock *); 510 extern int afs_flock(struct file *, int, struct file_lock *); 511 512 /* 513 * fsclient.c 514 */ 515 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 516 struct afs_vnode *, struct afs_volsync *, 517 const struct afs_wait_mode *); 518 extern int afs_fs_give_up_callbacks(struct afs_server *, 519 const struct afs_wait_mode *); 520 extern int afs_fs_fetch_data(struct afs_server *, struct key *, 521 struct afs_vnode *, off_t, size_t, struct page *, 522 const struct afs_wait_mode *); 523 extern int afs_fs_create(struct afs_server *, struct key *, 524 struct afs_vnode *, const char *, umode_t, 525 struct afs_fid *, struct afs_file_status *, 526 struct afs_callback *, 527 const struct afs_wait_mode *); 528 extern int afs_fs_remove(struct afs_server *, struct key *, 529 struct afs_vnode *, const char *, bool, 530 const struct afs_wait_mode *); 531 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 532 struct afs_vnode *, const char *, 533 const struct afs_wait_mode *); 534 extern int afs_fs_symlink(struct afs_server *, struct key *, 535 struct afs_vnode *, const char *, const char *, 536 struct afs_fid *, struct afs_file_status *, 537 const struct afs_wait_mode *); 538 extern int afs_fs_rename(struct afs_server *, struct key *, 539 struct afs_vnode *, const char *, 540 struct afs_vnode *, const char *, 541 const struct afs_wait_mode *); 542 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *, 543 pgoff_t, pgoff_t, unsigned, unsigned, 544 const struct afs_wait_mode *); 545 extern int afs_fs_setattr(struct afs_server *, struct key *, 546 struct afs_vnode *, struct iattr *, 547 const struct afs_wait_mode *); 548 extern int afs_fs_get_volume_status(struct afs_server *, struct key *, 549 struct afs_vnode *, 550 struct afs_volume_status *, 551 const struct afs_wait_mode *); 552 extern int afs_fs_set_lock(struct afs_server *, struct key *, 553 struct afs_vnode *, afs_lock_type_t, 554 const struct afs_wait_mode *); 555 extern int afs_fs_extend_lock(struct afs_server *, struct key *, 556 struct afs_vnode *, 557 const struct afs_wait_mode *); 558 extern int afs_fs_release_lock(struct afs_server *, struct key *, 559 struct afs_vnode *, 560 const struct afs_wait_mode *); 561 562 /* 563 * inode.c 564 */ 565 extern struct inode *afs_iget_autocell(struct inode *, const char *, int, 566 struct key *); 567 extern struct inode *afs_iget(struct super_block *, struct key *, 568 struct afs_fid *, struct afs_file_status *, 569 struct afs_callback *); 570 extern void afs_zap_data(struct afs_vnode *); 571 extern int afs_validate(struct afs_vnode *, struct key *); 572 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 573 extern int afs_setattr(struct dentry *, struct iattr *); 574 extern void afs_evict_inode(struct inode *); 575 extern int afs_drop_inode(struct inode *); 576 577 /* 578 * main.c 579 */ 580 extern struct workqueue_struct *afs_wq; 581 extern struct afs_uuid afs_uuid; 582 583 /* 584 * misc.c 585 */ 586 extern int afs_abort_to_error(u32); 587 588 /* 589 * mntpt.c 590 */ 591 extern const struct inode_operations afs_mntpt_inode_operations; 592 extern const struct inode_operations afs_autocell_inode_operations; 593 extern const struct file_operations afs_mntpt_file_operations; 594 595 extern struct vfsmount *afs_d_automount(struct path *); 596 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *); 597 extern void afs_mntpt_kill_timer(void); 598 599 /* 600 * proc.c 601 */ 602 extern int afs_proc_init(void); 603 extern void afs_proc_cleanup(void); 604 extern int afs_proc_cell_setup(struct afs_cell *); 605 extern void afs_proc_cell_remove(struct afs_cell *); 606 607 /* 608 * rxrpc.c 609 */ 610 extern int afs_open_socket(void); 611 extern void afs_close_socket(void); 612 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, 613 const struct afs_wait_mode *); 614 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 615 size_t, size_t); 616 extern void afs_flat_call_destructor(struct afs_call *); 617 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *); 618 extern void afs_send_empty_reply(struct afs_call *); 619 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 620 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *, 621 size_t); 622 623 /* 624 * security.c 625 */ 626 extern void afs_clear_permits(struct afs_vnode *); 627 extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 628 extern void afs_zap_permits(struct rcu_head *); 629 extern struct key *afs_request_key(struct afs_cell *); 630 extern int afs_permission(struct inode *, int); 631 632 /* 633 * server.c 634 */ 635 extern spinlock_t afs_server_peer_lock; 636 637 #define afs_get_server(S) \ 638 do { \ 639 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 640 atomic_inc(&(S)->usage); \ 641 } while(0) 642 643 extern struct afs_server *afs_lookup_server(struct afs_cell *, 644 const struct in_addr *); 645 extern struct afs_server *afs_find_server(const struct in_addr *); 646 extern void afs_put_server(struct afs_server *); 647 extern void __exit afs_purge_servers(void); 648 649 /* 650 * super.c 651 */ 652 extern int afs_fs_init(void); 653 extern void afs_fs_exit(void); 654 655 /* 656 * use-rtnetlink.c 657 */ 658 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 659 extern int afs_get_MAC_address(u8 *, size_t); 660 661 /* 662 * vlclient.c 663 */ 664 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 665 const char *, struct afs_cache_vlocation *, 666 const struct afs_wait_mode *); 667 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 668 afs_volid_t, afs_voltype_t, 669 struct afs_cache_vlocation *, 670 const struct afs_wait_mode *); 671 672 /* 673 * vlocation.c 674 */ 675 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 676 677 extern int __init afs_vlocation_update_init(void); 678 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 679 struct key *, 680 const char *, size_t); 681 extern void afs_put_vlocation(struct afs_vlocation *); 682 extern void afs_vlocation_purge(void); 683 684 /* 685 * vnode.c 686 */ 687 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 688 { 689 return container_of(inode, struct afs_vnode, vfs_inode); 690 } 691 692 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 693 { 694 return &vnode->vfs_inode; 695 } 696 697 extern void afs_vnode_finalise_status_update(struct afs_vnode *, 698 struct afs_server *); 699 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 700 struct key *); 701 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 702 off_t, size_t, struct page *); 703 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 704 umode_t, struct afs_fid *, struct afs_file_status *, 705 struct afs_callback *, struct afs_server **); 706 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 707 bool); 708 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 709 const char *); 710 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 711 const char *, struct afs_fid *, 712 struct afs_file_status *, struct afs_server **); 713 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 714 struct key *, const char *, const char *); 715 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t, 716 unsigned, unsigned); 717 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *); 718 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *, 719 struct afs_volume_status *); 720 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *, 721 afs_lock_type_t); 722 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *); 723 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *); 724 725 /* 726 * volume.c 727 */ 728 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 729 730 extern void afs_put_volume(struct afs_volume *); 731 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 732 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 733 extern int afs_volume_release_fileserver(struct afs_vnode *, 734 struct afs_server *, int); 735 736 /* 737 * write.c 738 */ 739 extern int afs_set_page_dirty(struct page *); 740 extern void afs_put_writeback(struct afs_writeback *); 741 extern int afs_write_begin(struct file *file, struct address_space *mapping, 742 loff_t pos, unsigned len, unsigned flags, 743 struct page **pagep, void **fsdata); 744 extern int afs_write_end(struct file *file, struct address_space *mapping, 745 loff_t pos, unsigned len, unsigned copied, 746 struct page *page, void *fsdata); 747 extern int afs_writepage(struct page *, struct writeback_control *); 748 extern int afs_writepages(struct address_space *, struct writeback_control *); 749 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 750 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 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