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 "afs.h" 20 #include "afs_vl.h" 21 22 #define AFS_CELL_MAX_ADDRS 15 23 24 struct afs_call; 25 26 typedef enum { 27 AFS_VL_NEW, /* new, uninitialised record */ 28 AFS_VL_CREATING, /* creating record */ 29 AFS_VL_VALID, /* record is pending */ 30 AFS_VL_NO_VOLUME, /* no such volume available */ 31 AFS_VL_UPDATING, /* update in progress */ 32 AFS_VL_VOLUME_DELETED, /* volume was deleted */ 33 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */ 34 } __attribute__((packed)) afs_vlocation_state_t; 35 36 struct afs_mount_params { 37 bool rwpath; /* T if the parent should be considered R/W */ 38 bool force; /* T to force cell type */ 39 afs_voltype_t type; /* type of volume requested */ 40 int volnamesz; /* size of volume name */ 41 const char *volname; /* name of volume to mount */ 42 struct afs_cell *cell; /* cell in which to find volume */ 43 struct afs_volume *volume; /* volume record */ 44 struct key *key; /* key to use for secure mounting */ 45 }; 46 47 /* 48 * definition of how to wait for the completion of an operation 49 */ 50 struct afs_wait_mode { 51 /* RxRPC received message notification */ 52 void (*rx_wakeup)(struct afs_call *call); 53 54 /* synchronous call waiter and call dispatched notification */ 55 int (*wait)(struct afs_call *call); 56 57 /* asynchronous call completion */ 58 void (*async_complete)(void *reply, int error); 59 }; 60 61 extern const struct afs_wait_mode afs_sync_call; 62 extern const struct afs_wait_mode afs_async_call; 63 64 /* 65 * a record of an in-progress RxRPC call 66 */ 67 struct afs_call { 68 const struct afs_call_type *type; /* type of call */ 69 const struct afs_wait_mode *wait_mode; /* completion wait mode */ 70 wait_queue_head_t waitq; /* processes awaiting completion */ 71 struct work_struct async_work; /* asynchronous work processor */ 72 struct work_struct work; /* actual work processor */ 73 struct sk_buff_head rx_queue; /* received packets */ 74 struct rxrpc_call *rxcall; /* RxRPC call handle */ 75 struct key *key; /* security for this call */ 76 struct afs_server *server; /* server affected by incoming CM call */ 77 void *request; /* request data (first part) */ 78 void *request2; /* request data (second part) */ 79 void *buffer; /* reply receive buffer */ 80 void *reply; /* reply buffer (first part) */ 81 void *reply2; /* reply buffer (second part) */ 82 void *reply3; /* reply buffer (third part) */ 83 void *reply4; /* reply buffer (fourth part) */ 84 enum { /* call state */ 85 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 86 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 87 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */ 88 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */ 89 AFS_CALL_REPLYING, /* replying to incoming call */ 90 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */ 91 AFS_CALL_COMPLETE, /* successfully completed */ 92 AFS_CALL_BUSY, /* server was busy */ 93 AFS_CALL_ABORTED, /* call was aborted */ 94 AFS_CALL_ERROR, /* call failed due to error */ 95 } state; 96 int error; /* error code */ 97 unsigned request_size; /* size of request data */ 98 unsigned reply_max; /* maximum size of reply */ 99 unsigned reply_size; /* current size of reply */ 100 unsigned short offset; /* offset into received data store */ 101 unsigned char unmarshall; /* unmarshalling phase */ 102 bool incoming; /* T if incoming call */ 103 u16 service_id; /* RxRPC service ID to call */ 104 __be16 port; /* target UDP port */ 105 __be32 operation_ID; /* operation ID for an incoming call */ 106 u32 count; /* count for use in unmarshalling */ 107 __be32 tmp; /* place to extract temporary data */ 108 }; 109 110 struct afs_call_type { 111 const char *name; 112 113 /* deliver request or reply data to an call 114 * - returning an error will cause the call to be aborted 115 */ 116 int (*deliver)(struct afs_call *call, struct sk_buff *skb, 117 bool last); 118 119 /* map an abort code to an error number */ 120 int (*abort_to_error)(u32 abort_code); 121 122 /* clean up a call */ 123 void (*destructor)(struct afs_call *call); 124 }; 125 126 /* 127 * AFS superblock private data 128 * - there's one superblock per volume 129 */ 130 struct afs_super_info { 131 struct afs_volume *volume; /* volume record */ 132 char rwparent; /* T if parent is R/W AFS volume */ 133 }; 134 135 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 136 { 137 return sb->s_fs_info; 138 } 139 140 extern struct file_system_type afs_fs_type; 141 142 /* 143 * entry in the cached cell catalogue 144 */ 145 struct afs_cache_cell { 146 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 147 struct in_addr vl_servers[15]; /* cached cell VL servers */ 148 }; 149 150 /* 151 * AFS cell record 152 */ 153 struct afs_cell { 154 atomic_t usage; 155 struct list_head link; /* main cell list link */ 156 struct key *anonymous_key; /* anonymous user key for this cell */ 157 struct list_head proc_link; /* /proc cell list link */ 158 struct proc_dir_entry *proc_dir; /* /proc dir for this cell */ 159 #ifdef AFS_CACHING_SUPPORT 160 struct cachefs_cookie *cache; /* caching cookie */ 161 #endif 162 163 /* server record management */ 164 rwlock_t servers_lock; /* active server list lock */ 165 struct list_head servers; /* active server list */ 166 167 /* volume location record management */ 168 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 169 struct list_head vl_list; /* cell's active VL record list */ 170 spinlock_t vl_lock; /* vl_list lock */ 171 unsigned short vl_naddrs; /* number of VL servers in addr list */ 172 unsigned short vl_curr_svix; /* current server index */ 173 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 174 175 char name[0]; /* cell name - must go last */ 176 }; 177 178 /* 179 * entry in the cached volume location catalogue 180 */ 181 struct afs_cache_vlocation { 182 /* volume name (lowercase, padded with NULs) */ 183 uint8_t name[AFS_MAXVOLNAME + 1]; 184 185 uint8_t nservers; /* number of entries used in servers[] */ 186 uint8_t vidmask; /* voltype mask for vid[] */ 187 uint8_t srvtmask[8]; /* voltype masks for servers[] */ 188 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 189 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 190 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 191 192 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ 193 struct in_addr servers[8]; /* fileserver addresses */ 194 time_t rtime; /* last retrieval time */ 195 }; 196 197 /* 198 * volume -> vnode hash table entry 199 */ 200 struct afs_cache_vhash { 201 afs_voltype_t vtype; /* which volume variation */ 202 uint8_t hash_bucket; /* which hash bucket this represents */ 203 } __attribute__((packed)); 204 205 /* 206 * AFS volume location record 207 */ 208 struct afs_vlocation { 209 atomic_t usage; 210 time_t time_of_death; /* time at which put reduced usage to 0 */ 211 struct list_head link; /* link in cell volume location list */ 212 struct list_head grave; /* link in master graveyard list */ 213 struct list_head update; /* link in master update list */ 214 struct afs_cell *cell; /* cell to which volume belongs */ 215 #ifdef AFS_CACHING_SUPPORT 216 struct cachefs_cookie *cache; /* caching cookie */ 217 #endif 218 struct afs_cache_vlocation vldb; /* volume information DB record */ 219 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ 220 wait_queue_head_t waitq; /* status change waitqueue */ 221 time_t update_at; /* time at which record should be updated */ 222 spinlock_t lock; /* access lock */ 223 afs_vlocation_state_t state; /* volume location state */ 224 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ 225 unsigned short upd_busy_cnt; /* EBUSY count during update */ 226 bool valid; /* T if valid */ 227 }; 228 229 /* 230 * AFS fileserver record 231 */ 232 struct afs_server { 233 atomic_t usage; 234 time_t time_of_death; /* time at which put reduced usage to 0 */ 235 struct in_addr addr; /* server address */ 236 struct afs_cell *cell; /* cell in which server resides */ 237 struct list_head link; /* link in cell's server list */ 238 struct list_head grave; /* link in master graveyard list */ 239 struct rb_node master_rb; /* link in master by-addr tree */ 240 struct rw_semaphore sem; /* access lock */ 241 242 /* file service access */ 243 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */ 244 unsigned long fs_act_jif; /* time at which last activity occurred */ 245 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ 246 spinlock_t fs_lock; /* access lock */ 247 int fs_state; /* 0 or reason FS currently marked dead (-errno) */ 248 249 /* callback promise management */ 250 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */ 251 struct delayed_work cb_updater; /* callback updater */ 252 struct delayed_work cb_break_work; /* collected break dispatcher */ 253 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */ 254 spinlock_t cb_lock; /* access lock */ 255 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */ 256 atomic_t cb_break_n; /* number of pending breaks */ 257 u8 cb_break_head; /* head of callback breaking ring */ 258 u8 cb_break_tail; /* tail of callback breaking ring */ 259 }; 260 261 /* 262 * AFS volume access record 263 */ 264 struct afs_volume { 265 atomic_t usage; 266 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ 267 struct afs_vlocation *vlocation; /* volume location */ 268 #ifdef AFS_CACHING_SUPPORT 269 struct cachefs_cookie *cache; /* caching cookie */ 270 #endif 271 afs_volid_t vid; /* volume ID */ 272 afs_voltype_t type; /* type of volume */ 273 char type_force; /* force volume type (suppress R/O -> R/W) */ 274 unsigned short nservers; /* number of server slots filled */ 275 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ 276 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ 277 struct rw_semaphore server_sem; /* lock for accessing current server */ 278 }; 279 280 /* 281 * vnode catalogue entry 282 */ 283 struct afs_cache_vnode { 284 afs_vnodeid_t vnode_id; /* vnode ID */ 285 unsigned vnode_unique; /* vnode ID uniquifier */ 286 afs_dataversion_t data_version; /* data version */ 287 }; 288 289 /* 290 * AFS inode private data 291 */ 292 struct afs_vnode { 293 struct inode vfs_inode; /* the VFS's inode record */ 294 295 struct afs_volume *volume; /* volume on which vnode resides */ 296 struct afs_server *server; /* server currently supplying this file */ 297 struct afs_fid fid; /* the file identifier for this inode */ 298 struct afs_file_status status; /* AFS status info for this file */ 299 #ifdef AFS_CACHING_SUPPORT 300 struct cachefs_cookie *cache; /* caching cookie */ 301 #endif 302 struct afs_permits *permits; /* cache of permits so far obtained */ 303 struct mutex permits_lock; /* lock for altering permits list */ 304 struct mutex validate_lock; /* lock for validating this vnode */ 305 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 306 int update_cnt; /* number of outstanding ops that will update the 307 * status */ 308 spinlock_t lock; /* waitqueue/flags lock */ 309 unsigned long flags; 310 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 311 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 312 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */ 313 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 314 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 315 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 316 317 long acl_order; /* ACL check count (callback break count) */ 318 319 /* outstanding callback notification on this file */ 320 struct rb_node server_rb; /* link in server->fs_vnodes */ 321 struct rb_node cb_promise; /* link in server->cb_promises */ 322 struct work_struct cb_broken_work; /* work to be done on callback break */ 323 time_t cb_expires; /* time at which callback expires */ 324 time_t cb_expires_at; /* time used to order cb_promise */ 325 unsigned cb_version; /* callback version */ 326 unsigned cb_expiry; /* callback expiry time */ 327 afs_callback_type_t cb_type; /* type of callback */ 328 bool cb_promised; /* true if promise still holds */ 329 }; 330 331 /* 332 * cached security record for one user's attempt to access a vnode 333 */ 334 struct afs_permit { 335 struct key *key; /* RxRPC ticket holding a security context */ 336 afs_access_t access_mask; /* access mask for this key */ 337 }; 338 339 /* 340 * cache of security records from attempts to access a vnode 341 */ 342 struct afs_permits { 343 struct rcu_head rcu; /* disposal procedure */ 344 int count; /* number of records */ 345 struct afs_permit permits[0]; /* the permits so far examined */ 346 }; 347 348 /* 349 * record of one of a system's set of network interfaces 350 */ 351 struct afs_interface { 352 unsigned index; /* interface index */ 353 struct in_addr address; /* IPv4 address bound to interface */ 354 struct in_addr netmask; /* netmask applied to address */ 355 unsigned mtu; /* MTU of interface */ 356 }; 357 358 /* 359 * UUID definition [internet draft] 360 * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns 361 * increments since midnight 15th October 1582 362 * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID 363 * time 364 * - the clock sequence is a 14-bit counter to avoid duplicate times 365 */ 366 struct afs_uuid { 367 u32 time_low; /* low part of timestamp */ 368 u16 time_mid; /* mid part of timestamp */ 369 u16 time_hi_and_version; /* high part of timestamp and version */ 370 #define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL 371 #define AFS_UUID_TIMEHI_MASK 0x0fff 372 #define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */ 373 #define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */ 374 #define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */ 375 u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */ 376 #define AFS_UUID_CLOCKHI_MASK 0x3f 377 #define AFS_UUID_VARIANT_STD 0x80 378 u8 clock_seq_low; /* clock seq low */ 379 u8 node[6]; /* spatially unique node ID (MAC addr) */ 380 }; 381 382 /*****************************************************************************/ 383 /* 384 * callback.c 385 */ 386 extern void afs_init_callback_state(struct afs_server *); 387 extern void afs_broken_callback_work(struct work_struct *); 388 extern void afs_break_callbacks(struct afs_server *, size_t, 389 struct afs_callback[]); 390 extern void afs_discard_callback_on_delete(struct afs_vnode *); 391 extern void afs_give_up_callback(struct afs_vnode *); 392 extern void afs_dispatch_give_up_callbacks(struct work_struct *); 393 extern void afs_flush_callback_breaks(struct afs_server *); 394 extern int __init afs_callback_update_init(void); 395 extern void __exit afs_callback_update_kill(void); 396 397 /* 398 * cell.c 399 */ 400 extern struct rw_semaphore afs_proc_cells_sem; 401 extern struct list_head afs_proc_cells; 402 #ifdef AFS_CACHING_SUPPORT 403 extern struct cachefs_index_def afs_cache_cell_index_def; 404 #endif 405 406 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) 407 extern int afs_cell_init(char *); 408 extern struct afs_cell *afs_cell_create(const char *, char *); 409 extern struct afs_cell *afs_cell_lookup(const char *, unsigned); 410 extern struct afs_cell *afs_grab_cell(struct afs_cell *); 411 extern void afs_put_cell(struct afs_cell *); 412 extern void afs_cell_purge(void); 413 414 /* 415 * cmservice.c 416 */ 417 extern bool afs_cm_incoming_call(struct afs_call *); 418 419 /* 420 * dir.c 421 */ 422 extern const struct inode_operations afs_dir_inode_operations; 423 extern const struct file_operations afs_dir_file_operations; 424 425 extern int afs_permission(struct inode *, int, struct nameidata *); 426 427 /* 428 * file.c 429 */ 430 extern const struct address_space_operations afs_fs_aops; 431 extern const struct inode_operations afs_file_inode_operations; 432 extern const struct file_operations afs_file_operations; 433 434 extern int afs_open(struct inode *, struct file *); 435 extern int afs_release(struct inode *, struct file *); 436 437 #ifdef AFS_CACHING_SUPPORT 438 extern int afs_cache_get_page_cookie(struct page *, struct cachefs_page **); 439 #endif 440 441 /* 442 * fsclient.c 443 */ 444 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 445 struct afs_vnode *, struct afs_volsync *, 446 const struct afs_wait_mode *); 447 extern int afs_fs_give_up_callbacks(struct afs_server *, 448 const struct afs_wait_mode *); 449 extern int afs_fs_fetch_data(struct afs_server *, struct key *, 450 struct afs_vnode *, off_t, size_t, struct page *, 451 const struct afs_wait_mode *); 452 extern int afs_fs_create(struct afs_server *, struct key *, 453 struct afs_vnode *, const char *, umode_t, 454 struct afs_fid *, struct afs_file_status *, 455 struct afs_callback *, 456 const struct afs_wait_mode *); 457 extern int afs_fs_remove(struct afs_server *, struct key *, 458 struct afs_vnode *, const char *, bool, 459 const struct afs_wait_mode *); 460 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 461 struct afs_vnode *, const char *, 462 const struct afs_wait_mode *); 463 extern int afs_fs_symlink(struct afs_server *, struct key *, 464 struct afs_vnode *, const char *, const char *, 465 struct afs_fid *, struct afs_file_status *, 466 const struct afs_wait_mode *); 467 extern int afs_fs_rename(struct afs_server *, struct key *, 468 struct afs_vnode *, const char *, 469 struct afs_vnode *, const char *, 470 const struct afs_wait_mode *); 471 472 /* 473 * inode.c 474 */ 475 extern struct inode *afs_iget(struct super_block *, struct key *, 476 struct afs_fid *, struct afs_file_status *, 477 struct afs_callback *); 478 extern int afs_validate(struct afs_vnode *, struct key *); 479 extern int afs_inode_getattr(struct vfsmount *, struct dentry *, 480 struct kstat *); 481 extern void afs_zap_permits(struct rcu_head *); 482 extern void afs_clear_inode(struct inode *); 483 484 /* 485 * main.c 486 */ 487 extern struct afs_uuid afs_uuid; 488 #ifdef AFS_CACHING_SUPPORT 489 extern struct cachefs_netfs afs_cache_netfs; 490 #endif 491 492 /* 493 * misc.c 494 */ 495 extern int afs_abort_to_error(u32); 496 497 /* 498 * mntpt.c 499 */ 500 extern const struct inode_operations afs_mntpt_inode_operations; 501 extern const struct file_operations afs_mntpt_file_operations; 502 extern unsigned long afs_mntpt_expiry_timeout; 503 504 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *); 505 extern void afs_mntpt_kill_timer(void); 506 extern void afs_umount_begin(struct vfsmount *, int); 507 508 /* 509 * proc.c 510 */ 511 extern int afs_proc_init(void); 512 extern void afs_proc_cleanup(void); 513 extern int afs_proc_cell_setup(struct afs_cell *); 514 extern void afs_proc_cell_remove(struct afs_cell *); 515 516 /* 517 * rxrpc.c 518 */ 519 extern int afs_open_socket(void); 520 extern void afs_close_socket(void); 521 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, 522 const struct afs_wait_mode *); 523 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 524 size_t, size_t); 525 extern void afs_flat_call_destructor(struct afs_call *); 526 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *); 527 extern void afs_send_empty_reply(struct afs_call *); 528 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 529 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *, 530 size_t); 531 532 /* 533 * security.c 534 */ 535 extern void afs_clear_permits(struct afs_vnode *); 536 extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 537 extern struct key *afs_request_key(struct afs_cell *); 538 extern int afs_permission(struct inode *, int, struct nameidata *); 539 540 /* 541 * server.c 542 */ 543 extern spinlock_t afs_server_peer_lock; 544 545 #define afs_get_server(S) \ 546 do { \ 547 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 548 atomic_inc(&(S)->usage); \ 549 } while(0) 550 551 extern struct afs_server *afs_lookup_server(struct afs_cell *, 552 const struct in_addr *); 553 extern struct afs_server *afs_find_server(const struct in_addr *); 554 extern void afs_put_server(struct afs_server *); 555 extern void __exit afs_purge_servers(void); 556 557 /* 558 * super.c 559 */ 560 extern int afs_fs_init(void); 561 extern void afs_fs_exit(void); 562 563 /* 564 * use-rtnetlink.c 565 */ 566 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 567 extern int afs_get_MAC_address(u8 [6]); 568 569 /* 570 * vlclient.c 571 */ 572 #ifdef AFS_CACHING_SUPPORT 573 extern struct cachefs_index_def afs_vlocation_cache_index_def; 574 #endif 575 576 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 577 const char *, struct afs_cache_vlocation *, 578 const struct afs_wait_mode *); 579 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 580 afs_volid_t, afs_voltype_t, 581 struct afs_cache_vlocation *, 582 const struct afs_wait_mode *); 583 584 /* 585 * vlocation.c 586 */ 587 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 588 589 extern int __init afs_vlocation_update_init(void); 590 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 591 struct key *, 592 const char *, size_t); 593 extern void afs_put_vlocation(struct afs_vlocation *); 594 extern void __exit afs_vlocation_purge(void); 595 596 /* 597 * vnode.c 598 */ 599 #ifdef AFS_CACHING_SUPPORT 600 extern struct cachefs_index_def afs_vnode_cache_index_def; 601 #endif 602 603 extern struct afs_timer_ops afs_vnode_cb_timed_out_ops; 604 605 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 606 { 607 return container_of(inode, struct afs_vnode, vfs_inode); 608 } 609 610 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 611 { 612 return &vnode->vfs_inode; 613 } 614 615 extern void afs_vnode_finalise_status_update(struct afs_vnode *, 616 struct afs_server *); 617 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 618 struct key *); 619 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 620 off_t, size_t, struct page *); 621 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 622 umode_t, struct afs_fid *, struct afs_file_status *, 623 struct afs_callback *, struct afs_server **); 624 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 625 bool); 626 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 627 const char *); 628 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 629 const char *, struct afs_fid *, 630 struct afs_file_status *, struct afs_server **); 631 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 632 struct key *, const char *, const char *); 633 634 /* 635 * volume.c 636 */ 637 #ifdef AFS_CACHING_SUPPORT 638 extern struct cachefs_index_def afs_volume_cache_index_def; 639 #endif 640 641 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 642 643 extern void afs_put_volume(struct afs_volume *); 644 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 645 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 646 extern int afs_volume_release_fileserver(struct afs_vnode *, 647 struct afs_server *, int); 648 649 /*****************************************************************************/ 650 /* 651 * debug tracing 652 */ 653 extern unsigned afs_debug; 654 655 #define dbgprintk(FMT,...) \ 656 printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__) 657 658 /* make sure we maintain the format strings, even when debugging is disabled */ 659 static inline __attribute__((format(printf,1,2))) 660 void _dbprintk(const char *fmt, ...) 661 { 662 } 663 664 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__) 665 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__) 666 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 667 668 669 #if defined(__KDEBUG) 670 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 671 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 672 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 673 674 #elif defined(CONFIG_AFS_DEBUG) 675 #define AFS_DEBUG_KENTER 0x01 676 #define AFS_DEBUG_KLEAVE 0x02 677 #define AFS_DEBUG_KDEBUG 0x04 678 679 #define _enter(FMT,...) \ 680 do { \ 681 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 682 kenter(FMT,##__VA_ARGS__); \ 683 } while (0) 684 685 #define _leave(FMT,...) \ 686 do { \ 687 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 688 kleave(FMT,##__VA_ARGS__); \ 689 } while (0) 690 691 #define _debug(FMT,...) \ 692 do { \ 693 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 694 kdebug(FMT,##__VA_ARGS__); \ 695 } while (0) 696 697 #else 698 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__) 699 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__) 700 #define _debug(FMT,...) _dbprintk(" "FMT ,##__VA_ARGS__) 701 #endif 702 703 /* 704 * debug assertion checking 705 */ 706 #if 1 // defined(__KDEBUGALL) 707 708 #define ASSERT(X) \ 709 do { \ 710 if (unlikely(!(X))) { \ 711 printk(KERN_ERR "\n"); \ 712 printk(KERN_ERR "AFS: Assertion failed\n"); \ 713 BUG(); \ 714 } \ 715 } while(0) 716 717 #define ASSERTCMP(X, OP, Y) \ 718 do { \ 719 if (unlikely(!((X) OP (Y)))) { \ 720 printk(KERN_ERR "\n"); \ 721 printk(KERN_ERR "AFS: Assertion failed\n"); \ 722 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 723 (unsigned long)(X), (unsigned long)(Y)); \ 724 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 725 (unsigned long)(X), (unsigned long)(Y)); \ 726 BUG(); \ 727 } \ 728 } while(0) 729 730 #define ASSERTIF(C, X) \ 731 do { \ 732 if (unlikely((C) && !(X))) { \ 733 printk(KERN_ERR "\n"); \ 734 printk(KERN_ERR "AFS: Assertion failed\n"); \ 735 BUG(); \ 736 } \ 737 } while(0) 738 739 #define ASSERTIFCMP(C, X, OP, Y) \ 740 do { \ 741 if (unlikely((C) && !((X) OP (Y)))) { \ 742 printk(KERN_ERR "\n"); \ 743 printk(KERN_ERR "AFS: Assertion failed\n"); \ 744 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 745 (unsigned long)(X), (unsigned long)(Y)); \ 746 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 747 (unsigned long)(X), (unsigned long)(Y)); \ 748 BUG(); \ 749 } \ 750 } while(0) 751 752 #else 753 754 #define ASSERT(X) \ 755 do { \ 756 } while(0) 757 758 #define ASSERTCMP(X, OP, Y) \ 759 do { \ 760 } while(0) 761 762 #define ASSERTIF(C, X) \ 763 do { \ 764 } while(0) 765 766 #define ASSERTIFCMP(C, X, OP, Y) \ 767 do { \ 768 } while(0) 769 770 #endif /* __KDEBUGALL */ 771