1 /* internal AFS stuff 2 * 3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/compiler.h> 13 #include <linux/kernel.h> 14 #include <linux/fs.h> 15 #include <linux/pagemap.h> 16 #include <linux/rxrpc.h> 17 #include <linux/key.h> 18 #include <linux/workqueue.h> 19 #include <linux/sched.h> 20 #include <linux/fscache.h> 21 #include <linux/backing-dev.h> 22 #include <net/af_rxrpc.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 rxrpc_notify_rx_t notify_rx; 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 rxrpc_call *rxcall; /* RxRPC call handle */ 81 struct key *key; /* security for this call */ 82 struct afs_server *server; /* server affected by incoming CM call */ 83 void *request; /* request data (first part) */ 84 struct address_space *mapping; /* page set */ 85 struct afs_writeback *wb; /* writeback being performed */ 86 void *buffer; /* reply receive buffer */ 87 void *reply; /* reply buffer (first part) */ 88 void *reply2; /* reply buffer (second part) */ 89 void *reply3; /* reply buffer (third part) */ 90 void *reply4; /* reply buffer (fourth part) */ 91 pgoff_t first; /* first page in mapping to deal with */ 92 pgoff_t last; /* last page in mapping to deal with */ 93 size_t offset; /* offset into received data store */ 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, /* Completed or failed */ 102 } state; 103 int error; /* error code */ 104 u32 abort_code; /* Remote abort ID or 0 */ 105 unsigned request_size; /* size of request data */ 106 unsigned reply_max; /* maximum size of reply */ 107 unsigned first_offset; /* offset into mapping[first] */ 108 unsigned last_to; /* amount of mapping[last] */ 109 unsigned char unmarshall; /* unmarshalling phase */ 110 bool incoming; /* T if incoming call */ 111 bool send_pages; /* T if data from mapping should be sent */ 112 bool need_attention; /* T if RxRPC poked us */ 113 u16 service_id; /* RxRPC service ID to call */ 114 __be16 port; /* target UDP port */ 115 u32 operation_ID; /* operation ID for an incoming call */ 116 u32 count; /* count for use in unmarshalling */ 117 __be32 tmp; /* place to extract temporary data */ 118 afs_dataversion_t store_version; /* updated version expected from store */ 119 }; 120 121 struct afs_call_type { 122 const char *name; 123 124 /* deliver request or reply data to an call 125 * - returning an error will cause the call to be aborted 126 */ 127 int (*deliver)(struct afs_call *call); 128 129 /* map an abort code to an error number */ 130 int (*abort_to_error)(u32 abort_code); 131 132 /* clean up a call */ 133 void (*destructor)(struct afs_call *call); 134 }; 135 136 /* 137 * record of an outstanding writeback on a vnode 138 */ 139 struct afs_writeback { 140 struct list_head link; /* link in vnode->writebacks */ 141 struct work_struct writer; /* work item to perform the writeback */ 142 struct afs_vnode *vnode; /* vnode to which this write applies */ 143 struct key *key; /* owner of this write */ 144 wait_queue_head_t waitq; /* completion and ready wait queue */ 145 pgoff_t first; /* first page in batch */ 146 pgoff_t point; /* last page in current store op */ 147 pgoff_t last; /* last page in batch (inclusive) */ 148 unsigned offset_first; /* offset into first page of start of write */ 149 unsigned to_last; /* offset into last page of end of write */ 150 int num_conflicts; /* count of conflicting writes in list */ 151 int usage; 152 bool conflicts; /* T if has dependent conflicts */ 153 enum { 154 AFS_WBACK_SYNCING, /* synchronisation being performed */ 155 AFS_WBACK_PENDING, /* write pending */ 156 AFS_WBACK_CONFLICTING, /* conflicting writes posted */ 157 AFS_WBACK_WRITING, /* writing back */ 158 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */ 159 } state __attribute__((packed)); 160 }; 161 162 /* 163 * AFS superblock private data 164 * - there's one superblock per volume 165 */ 166 struct afs_super_info { 167 struct afs_volume *volume; /* volume record */ 168 char rwparent; /* T if parent is R/W AFS volume */ 169 }; 170 171 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 172 { 173 return sb->s_fs_info; 174 } 175 176 extern struct file_system_type afs_fs_type; 177 178 /* 179 * entry in the cached cell catalogue 180 */ 181 struct afs_cache_cell { 182 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 183 struct in_addr vl_servers[15]; /* cached cell VL servers */ 184 }; 185 186 /* 187 * AFS cell record 188 */ 189 struct afs_cell { 190 atomic_t usage; 191 struct list_head link; /* main cell list link */ 192 struct key *anonymous_key; /* anonymous user key for this cell */ 193 struct list_head proc_link; /* /proc cell list link */ 194 #ifdef CONFIG_AFS_FSCACHE 195 struct fscache_cookie *cache; /* caching cookie */ 196 #endif 197 198 /* server record management */ 199 rwlock_t servers_lock; /* active server list lock */ 200 struct list_head servers; /* active server list */ 201 202 /* volume location record management */ 203 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 204 struct list_head vl_list; /* cell's active VL record list */ 205 spinlock_t vl_lock; /* vl_list lock */ 206 unsigned short vl_naddrs; /* number of VL servers in addr list */ 207 unsigned short vl_curr_svix; /* current server index */ 208 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 209 210 char name[0]; /* cell name - must go last */ 211 }; 212 213 /* 214 * entry in the cached volume location catalogue 215 */ 216 struct afs_cache_vlocation { 217 /* volume name (lowercase, padded with NULs) */ 218 uint8_t name[AFS_MAXVOLNAME + 1]; 219 220 uint8_t nservers; /* number of entries used in servers[] */ 221 uint8_t vidmask; /* voltype mask for vid[] */ 222 uint8_t srvtmask[8]; /* voltype masks for servers[] */ 223 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 224 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 225 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 226 227 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ 228 struct in_addr servers[8]; /* fileserver addresses */ 229 time_t rtime; /* last retrieval time */ 230 }; 231 232 /* 233 * volume -> vnode hash table entry 234 */ 235 struct afs_cache_vhash { 236 afs_voltype_t vtype; /* which volume variation */ 237 uint8_t hash_bucket; /* which hash bucket this represents */ 238 } __attribute__((packed)); 239 240 /* 241 * AFS volume location record 242 */ 243 struct afs_vlocation { 244 atomic_t usage; 245 time_t time_of_death; /* time at which put reduced usage to 0 */ 246 struct list_head link; /* link in cell volume location list */ 247 struct list_head grave; /* link in master graveyard list */ 248 struct list_head update; /* link in master update list */ 249 struct afs_cell *cell; /* cell to which volume belongs */ 250 #ifdef CONFIG_AFS_FSCACHE 251 struct fscache_cookie *cache; /* caching cookie */ 252 #endif 253 struct afs_cache_vlocation vldb; /* volume information DB record */ 254 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ 255 wait_queue_head_t waitq; /* status change waitqueue */ 256 time_t update_at; /* time at which record should be updated */ 257 spinlock_t lock; /* access lock */ 258 afs_vlocation_state_t state; /* volume location state */ 259 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ 260 unsigned short upd_busy_cnt; /* EBUSY count during update */ 261 bool valid; /* T if valid */ 262 }; 263 264 /* 265 * AFS fileserver record 266 */ 267 struct afs_server { 268 atomic_t usage; 269 time_t time_of_death; /* time at which put reduced usage to 0 */ 270 struct in_addr addr; /* server address */ 271 struct afs_cell *cell; /* cell in which server resides */ 272 struct list_head link; /* link in cell's server list */ 273 struct list_head grave; /* link in master graveyard list */ 274 struct rb_node master_rb; /* link in master by-addr tree */ 275 struct rw_semaphore sem; /* access lock */ 276 277 /* file service access */ 278 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */ 279 unsigned long fs_act_jif; /* time at which last activity occurred */ 280 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ 281 spinlock_t fs_lock; /* access lock */ 282 int fs_state; /* 0 or reason FS currently marked dead (-errno) */ 283 284 /* callback promise management */ 285 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */ 286 struct delayed_work cb_updater; /* callback updater */ 287 struct delayed_work cb_break_work; /* collected break dispatcher */ 288 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */ 289 spinlock_t cb_lock; /* access lock */ 290 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */ 291 atomic_t cb_break_n; /* number of pending breaks */ 292 u8 cb_break_head; /* head of callback breaking ring */ 293 u8 cb_break_tail; /* tail of callback breaking ring */ 294 }; 295 296 /* 297 * AFS volume access record 298 */ 299 struct afs_volume { 300 atomic_t usage; 301 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ 302 struct afs_vlocation *vlocation; /* volume location */ 303 #ifdef CONFIG_AFS_FSCACHE 304 struct fscache_cookie *cache; /* caching cookie */ 305 #endif 306 afs_volid_t vid; /* volume ID */ 307 afs_voltype_t type; /* type of volume */ 308 char type_force; /* force volume type (suppress R/O -> R/W) */ 309 unsigned short nservers; /* number of server slots filled */ 310 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ 311 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ 312 struct rw_semaphore server_sem; /* lock for accessing current server */ 313 struct backing_dev_info bdi; 314 }; 315 316 /* 317 * vnode catalogue entry 318 */ 319 struct afs_cache_vnode { 320 afs_vnodeid_t vnode_id; /* vnode ID */ 321 unsigned vnode_unique; /* vnode ID uniquifier */ 322 afs_dataversion_t data_version; /* data version */ 323 }; 324 325 /* 326 * AFS inode private data 327 */ 328 struct afs_vnode { 329 struct inode vfs_inode; /* the VFS's inode record */ 330 331 struct afs_volume *volume; /* volume on which vnode resides */ 332 struct afs_server *server; /* server currently supplying this file */ 333 struct afs_fid fid; /* the file identifier for this inode */ 334 struct afs_file_status status; /* AFS status info for this file */ 335 #ifdef CONFIG_AFS_FSCACHE 336 struct fscache_cookie *cache; /* caching cookie */ 337 #endif 338 struct afs_permits *permits; /* cache of permits so far obtained */ 339 struct mutex permits_lock; /* lock for altering permits list */ 340 struct mutex validate_lock; /* lock for validating this vnode */ 341 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 342 int update_cnt; /* number of outstanding ops that will update the 343 * status */ 344 spinlock_t writeback_lock; /* lock for writebacks */ 345 spinlock_t lock; /* waitqueue/flags lock */ 346 unsigned long flags; 347 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 348 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 349 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */ 350 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 351 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 352 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 353 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */ 354 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */ 355 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */ 356 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */ 357 #define AFS_VNODE_AUTOCELL 10 /* set if Vnode is an auto mount point */ 358 #define AFS_VNODE_PSEUDODIR 11 /* set if Vnode is a pseudo directory */ 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 *, unsigned, char *, bool); 470 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool); 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 dentry_operations afs_fs_dentry_operations; 485 extern const struct file_operations afs_dir_file_operations; 486 487 /* 488 * file.c 489 */ 490 extern const struct address_space_operations afs_fs_aops; 491 extern const struct inode_operations afs_file_inode_operations; 492 extern const struct file_operations afs_file_operations; 493 494 extern int afs_open(struct inode *, struct file *); 495 extern int afs_release(struct inode *, struct file *); 496 extern int afs_page_filler(void *, struct page *); 497 498 /* 499 * flock.c 500 */ 501 extern void __exit afs_kill_lock_manager(void); 502 extern void afs_lock_work(struct work_struct *); 503 extern void afs_lock_may_be_available(struct afs_vnode *); 504 extern int afs_lock(struct file *, int, struct file_lock *); 505 extern int afs_flock(struct file *, int, struct file_lock *); 506 507 /* 508 * fsclient.c 509 */ 510 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 511 struct afs_vnode *, struct afs_volsync *, 512 const struct afs_wait_mode *); 513 extern int afs_fs_give_up_callbacks(struct afs_server *, 514 const struct afs_wait_mode *); 515 extern int afs_fs_fetch_data(struct afs_server *, struct key *, 516 struct afs_vnode *, off_t, size_t, struct page *, 517 const struct afs_wait_mode *); 518 extern int afs_fs_create(struct afs_server *, struct key *, 519 struct afs_vnode *, const char *, umode_t, 520 struct afs_fid *, struct afs_file_status *, 521 struct afs_callback *, 522 const struct afs_wait_mode *); 523 extern int afs_fs_remove(struct afs_server *, struct key *, 524 struct afs_vnode *, const char *, bool, 525 const struct afs_wait_mode *); 526 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 527 struct afs_vnode *, const char *, 528 const struct afs_wait_mode *); 529 extern int afs_fs_symlink(struct afs_server *, struct key *, 530 struct afs_vnode *, const char *, const char *, 531 struct afs_fid *, struct afs_file_status *, 532 const struct afs_wait_mode *); 533 extern int afs_fs_rename(struct afs_server *, struct key *, 534 struct afs_vnode *, const char *, 535 struct afs_vnode *, const char *, 536 const struct afs_wait_mode *); 537 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *, 538 pgoff_t, pgoff_t, unsigned, unsigned, 539 const struct afs_wait_mode *); 540 extern int afs_fs_setattr(struct afs_server *, struct key *, 541 struct afs_vnode *, struct iattr *, 542 const struct afs_wait_mode *); 543 extern int afs_fs_get_volume_status(struct afs_server *, struct key *, 544 struct afs_vnode *, 545 struct afs_volume_status *, 546 const struct afs_wait_mode *); 547 extern int afs_fs_set_lock(struct afs_server *, struct key *, 548 struct afs_vnode *, afs_lock_type_t, 549 const struct afs_wait_mode *); 550 extern int afs_fs_extend_lock(struct afs_server *, struct key *, 551 struct afs_vnode *, 552 const struct afs_wait_mode *); 553 extern int afs_fs_release_lock(struct afs_server *, struct key *, 554 struct afs_vnode *, 555 const struct afs_wait_mode *); 556 557 /* 558 * inode.c 559 */ 560 extern struct inode *afs_iget_autocell(struct inode *, const char *, int, 561 struct key *); 562 extern struct inode *afs_iget(struct super_block *, struct key *, 563 struct afs_fid *, struct afs_file_status *, 564 struct afs_callback *); 565 extern void afs_zap_data(struct afs_vnode *); 566 extern int afs_validate(struct afs_vnode *, struct key *); 567 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 568 extern int afs_setattr(struct dentry *, struct iattr *); 569 extern void afs_evict_inode(struct inode *); 570 extern int afs_drop_inode(struct inode *); 571 572 /* 573 * main.c 574 */ 575 extern struct workqueue_struct *afs_wq; 576 extern struct afs_uuid afs_uuid; 577 578 /* 579 * misc.c 580 */ 581 extern int afs_abort_to_error(u32); 582 583 /* 584 * mntpt.c 585 */ 586 extern const struct inode_operations afs_mntpt_inode_operations; 587 extern const struct inode_operations afs_autocell_inode_operations; 588 extern const struct file_operations afs_mntpt_file_operations; 589 590 extern struct vfsmount *afs_d_automount(struct path *); 591 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *); 592 extern void afs_mntpt_kill_timer(void); 593 594 /* 595 * proc.c 596 */ 597 extern int afs_proc_init(void); 598 extern void afs_proc_cleanup(void); 599 extern int afs_proc_cell_setup(struct afs_cell *); 600 extern void afs_proc_cell_remove(struct afs_cell *); 601 602 /* 603 * rxrpc.c 604 */ 605 extern struct socket *afs_socket; 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_send_empty_reply(struct afs_call *); 615 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 616 extern int afs_extract_data(struct afs_call *, void *, size_t, bool); 617 618 static inline int afs_transfer_reply(struct afs_call *call) 619 { 620 return afs_extract_data(call, call->buffer, call->reply_max, false); 621 } 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 sockaddr_rxrpc *); 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