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 29struct pagevec; 30struct afs_call; 31 32typedef 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 42struct 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 */ 57struct 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 68extern const struct afs_wait_mode afs_sync_call; 69extern const struct afs_wait_mode afs_async_call; 70 71/* 72 * a record of an in-progress RxRPC call 73 */ 74struct afs_call { 75 const struct afs_call_type *type; /* type of call */ 76 const struct afs_wait_mode *wait_mode; /* completion wait mode */ 77 wait_queue_head_t waitq; /* processes awaiting completion */ 78 struct work_struct async_work; /* asynchronous work processor */ 79 struct work_struct work; /* actual work processor */ 80 struct sk_buff_head rx_queue; /* received packets */ 81 struct rxrpc_call *rxcall; /* RxRPC call handle */ 82 struct key *key; /* security for this call */ 83 struct afs_server *server; /* server affected by incoming CM call */ 84 void *request; /* request data (first part) */ 85 struct address_space *mapping; /* page set */ 86 struct afs_writeback *wb; /* writeback being performed */ 87 void *buffer; /* reply receive buffer */ 88 void *reply; /* reply buffer (first part) */ 89 void *reply2; /* reply buffer (second part) */ 90 void *reply3; /* reply buffer (third part) */ 91 void *reply4; /* reply buffer (fourth part) */ 92 pgoff_t first; /* first page in mapping to deal with */ 93 pgoff_t last; /* last page in mapping to deal with */ 94 enum { /* call state */ 95 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 96 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 97 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */ 98 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */ 99 AFS_CALL_REPLYING, /* replying to incoming call */ 100 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */ 101 AFS_CALL_COMPLETE, /* successfully completed */ 102 AFS_CALL_BUSY, /* server was busy */ 103 AFS_CALL_ABORTED, /* call was aborted */ 104 AFS_CALL_ERROR, /* call failed due to error */ 105 } state; 106 int error; /* error code */ 107 unsigned request_size; /* size of request data */ 108 unsigned reply_max; /* maximum size of reply */ 109 unsigned reply_size; /* current size of reply */ 110 unsigned first_offset; /* offset into mapping[first] */ 111 unsigned last_to; /* amount of mapping[last] */ 112 unsigned short offset; /* offset into received data store */ 113 unsigned char unmarshall; /* unmarshalling phase */ 114 bool incoming; /* T if incoming call */ 115 bool send_pages; /* T if data from mapping should be sent */ 116 u16 service_id; /* RxRPC service ID to call */ 117 __be16 port; /* target UDP port */ 118 __be32 operation_ID; /* operation ID for an incoming call */ 119 u32 count; /* count for use in unmarshalling */ 120 __be32 tmp; /* place to extract temporary data */ 121 afs_dataversion_t store_version; /* updated version expected from store */ 122}; 123 124struct afs_call_type { 125 const char *name; 126 127 /* deliver request or reply data to an call 128 * - returning an error will cause the call to be aborted 129 */ 130 int (*deliver)(struct afs_call *call, struct sk_buff *skb, 131 bool last); 132 133 /* map an abort code to an error number */ 134 int (*abort_to_error)(u32 abort_code); 135 136 /* clean up a call */ 137 void (*destructor)(struct afs_call *call); 138}; 139 140/* 141 * record of an outstanding writeback on a vnode 142 */ 143struct afs_writeback { 144 struct list_head link; /* link in vnode->writebacks */ 145 struct work_struct writer; /* work item to perform the writeback */ 146 struct afs_vnode *vnode; /* vnode to which this write applies */ 147 struct key *key; /* owner of this write */ 148 wait_queue_head_t waitq; /* completion and ready wait queue */ 149 pgoff_t first; /* first page in batch */ 150 pgoff_t point; /* last page in current store op */ 151 pgoff_t last; /* last page in batch (inclusive) */ 152 unsigned offset_first; /* offset into first page of start of write */ 153 unsigned to_last; /* offset into last page of end of write */ 154 int num_conflicts; /* count of conflicting writes in list */ 155 int usage; 156 bool conflicts; /* T if has dependent conflicts */ 157 enum { 158 AFS_WBACK_SYNCING, /* synchronisation being performed */ 159 AFS_WBACK_PENDING, /* write pending */ 160 AFS_WBACK_CONFLICTING, /* conflicting writes posted */ 161 AFS_WBACK_WRITING, /* writing back */ 162 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */ 163 } state __attribute__((packed)); 164}; 165 166/* 167 * AFS superblock private data 168 * - there's one superblock per volume 169 */ 170struct afs_super_info { 171 struct afs_volume *volume; /* volume record */ 172 char rwparent; /* T if parent is R/W AFS volume */ 173}; 174 175static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 176{ 177 return sb->s_fs_info; 178} 179 180extern struct file_system_type afs_fs_type; 181 182/* 183 * entry in the cached cell catalogue 184 */ 185struct afs_cache_cell { 186 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 187 struct in_addr vl_servers[15]; /* cached cell VL servers */ 188}; 189 190/* 191 * AFS cell record 192 */ 193struct afs_cell { 194 atomic_t usage; 195 struct list_head link; /* main cell list link */ 196 struct key *anonymous_key; /* anonymous user key for this cell */ 197 struct list_head proc_link; /* /proc cell list link */ 198 struct proc_dir_entry *proc_dir; /* /proc dir for this cell */ 199#ifdef CONFIG_AFS_FSCACHE 200 struct fscache_cookie *cache; /* caching cookie */ 201#endif 202 203 /* server record management */ 204 rwlock_t servers_lock; /* active server list lock */ 205 struct list_head servers; /* active server list */ 206 207 /* volume location record management */ 208 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 209 struct list_head vl_list; /* cell's active VL record list */ 210 spinlock_t vl_lock; /* vl_list lock */ 211 unsigned short vl_naddrs; /* number of VL servers in addr list */ 212 unsigned short vl_curr_svix; /* current server index */ 213 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 214 215 char name[0]; /* cell name - must go last */ 216}; 217 218/* 219 * entry in the cached volume location catalogue 220 */ 221struct 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 */ 240struct 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 */ 248struct 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 */ 272struct 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 */ 304struct 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 */ 324struct 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 */ 333struct 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 */ 388struct 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 */ 396struct 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 */ 405struct 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 */ 419struct 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 440extern struct fscache_netfs afs_cache_netfs; 441extern struct fscache_cookie_def afs_cell_cache_index_def; 442extern struct fscache_cookie_def afs_vlocation_cache_index_def; 443extern struct fscache_cookie_def afs_volume_cache_index_def; 444extern 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 */ 455extern void afs_init_callback_state(struct afs_server *); 456extern void afs_broken_callback_work(struct work_struct *); 457extern void afs_break_callbacks(struct afs_server *, size_t, 458 struct afs_callback[]); 459extern void afs_discard_callback_on_delete(struct afs_vnode *); 460extern void afs_give_up_callback(struct afs_vnode *); 461extern void afs_dispatch_give_up_callbacks(struct work_struct *); 462extern void afs_flush_callback_breaks(struct afs_server *); 463extern int __init afs_callback_update_init(void); 464extern void afs_callback_update_kill(void); 465 466/* 467 * cell.c 468 */ 469extern struct rw_semaphore afs_proc_cells_sem; 470extern struct list_head afs_proc_cells; 471 472#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) 473extern int afs_cell_init(char *); 474extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool); 475extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool); 476extern struct afs_cell *afs_grab_cell(struct afs_cell *); 477extern void afs_put_cell(struct afs_cell *); 478extern void afs_cell_purge(void); 479 480/* 481 * cmservice.c 482 */ 483extern bool afs_cm_incoming_call(struct afs_call *); 484 485/* 486 * dir.c 487 */ 488extern const struct inode_operations afs_dir_inode_operations; 489extern const struct file_operations afs_dir_file_operations; 490 491/* 492 * file.c 493 */ 494extern const struct address_space_operations afs_fs_aops; 495extern const struct inode_operations afs_file_inode_operations; 496extern const struct file_operations afs_file_operations; 497 498extern int afs_open(struct inode *, struct file *); 499extern int afs_release(struct inode *, struct file *); 500extern int afs_page_filler(void *, struct page *); 501 502/* 503 * flock.c 504 */ 505extern void __exit afs_kill_lock_manager(void); 506extern void afs_lock_work(struct work_struct *); 507extern void afs_lock_may_be_available(struct afs_vnode *); 508extern int afs_lock(struct file *, int, struct file_lock *); 509extern int afs_flock(struct file *, int, struct file_lock *); 510 511/* 512 * fsclient.c 513 */ 514extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 515 struct afs_vnode *, struct afs_volsync *, 516 const struct afs_wait_mode *); 517extern int afs_fs_give_up_callbacks(struct afs_server *, 518 const struct afs_wait_mode *); 519extern int afs_fs_fetch_data(struct afs_server *, struct key *, 520 struct afs_vnode *, off_t, size_t, struct page *, 521 const struct afs_wait_mode *); 522extern int afs_fs_create(struct afs_server *, struct key *, 523 struct afs_vnode *, const char *, umode_t, 524 struct afs_fid *, struct afs_file_status *, 525 struct afs_callback *, 526 const struct afs_wait_mode *); 527extern int afs_fs_remove(struct afs_server *, struct key *, 528 struct afs_vnode *, const char *, bool, 529 const struct afs_wait_mode *); 530extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 531 struct afs_vnode *, const char *, 532 const struct afs_wait_mode *); 533extern int afs_fs_symlink(struct afs_server *, struct key *, 534 struct afs_vnode *, const char *, const char *, 535 struct afs_fid *, struct afs_file_status *, 536 const struct afs_wait_mode *); 537extern int afs_fs_rename(struct afs_server *, struct key *, 538 struct afs_vnode *, const char *, 539 struct afs_vnode *, const char *, 540 const struct afs_wait_mode *); 541extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *, 542 pgoff_t, pgoff_t, unsigned, unsigned, 543 const struct afs_wait_mode *); 544extern int afs_fs_setattr(struct afs_server *, struct key *, 545 struct afs_vnode *, struct iattr *, 546 const struct afs_wait_mode *); 547extern int afs_fs_get_volume_status(struct afs_server *, struct key *, 548 struct afs_vnode *, 549 struct afs_volume_status *, 550 const struct afs_wait_mode *); 551extern int afs_fs_set_lock(struct afs_server *, struct key *, 552 struct afs_vnode *, afs_lock_type_t, 553 const struct afs_wait_mode *); 554extern int afs_fs_extend_lock(struct afs_server *, struct key *, 555 struct afs_vnode *, 556 const struct afs_wait_mode *); 557extern int afs_fs_release_lock(struct afs_server *, struct key *, 558 struct afs_vnode *, 559 const struct afs_wait_mode *); 560 561/* 562 * inode.c 563 */ 564extern struct inode *afs_iget_autocell(struct inode *, const char *, int, 565 struct key *); 566extern struct inode *afs_iget(struct super_block *, struct key *, 567 struct afs_fid *, struct afs_file_status *, 568 struct afs_callback *); 569extern void afs_zap_data(struct afs_vnode *); 570extern int afs_validate(struct afs_vnode *, struct key *); 571extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 572extern int afs_setattr(struct dentry *, struct iattr *); 573extern void afs_evict_inode(struct inode *); 574extern int afs_drop_inode(struct inode *); 575 576/* 577 * main.c 578 */ 579extern struct afs_uuid afs_uuid; 580 581/* 582 * misc.c 583 */ 584extern int afs_abort_to_error(u32); 585 586/* 587 * mntpt.c 588 */ 589extern const struct inode_operations afs_mntpt_inode_operations; 590extern const struct inode_operations afs_autocell_inode_operations; 591extern const struct file_operations afs_mntpt_file_operations; 592 593extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *); 594extern void afs_mntpt_kill_timer(void); 595 596/* 597 * proc.c 598 */ 599extern int afs_proc_init(void); 600extern void afs_proc_cleanup(void); 601extern int afs_proc_cell_setup(struct afs_cell *); 602extern void afs_proc_cell_remove(struct afs_cell *); 603 604/* 605 * rxrpc.c 606 */ 607extern int afs_open_socket(void); 608extern void afs_close_socket(void); 609extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, 610 const struct afs_wait_mode *); 611extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 612 size_t, size_t); 613extern void afs_flat_call_destructor(struct afs_call *); 614extern void afs_transfer_reply(struct afs_call *, struct sk_buff *); 615extern void afs_send_empty_reply(struct afs_call *); 616extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 617extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *, 618 size_t); 619 620/* 621 * security.c 622 */ 623extern void afs_clear_permits(struct afs_vnode *); 624extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 625extern void afs_zap_permits(struct rcu_head *); 626extern struct key *afs_request_key(struct afs_cell *); 627extern int afs_permission(struct inode *, int); 628 629/* 630 * server.c 631 */ 632extern spinlock_t afs_server_peer_lock; 633 634#define afs_get_server(S) \ 635do { \ 636 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 637 atomic_inc(&(S)->usage); \ 638} while(0) 639 640extern struct afs_server *afs_lookup_server(struct afs_cell *, 641 const struct in_addr *); 642extern struct afs_server *afs_find_server(const struct in_addr *); 643extern void afs_put_server(struct afs_server *); 644extern void __exit afs_purge_servers(void); 645 646/* 647 * super.c 648 */ 649extern int afs_fs_init(void); 650extern void afs_fs_exit(void); 651 652/* 653 * use-rtnetlink.c 654 */ 655extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 656extern int afs_get_MAC_address(u8 *, size_t); 657 658/* 659 * vlclient.c 660 */ 661extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 662 const char *, struct afs_cache_vlocation *, 663 const struct afs_wait_mode *); 664extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 665 afs_volid_t, afs_voltype_t, 666 struct afs_cache_vlocation *, 667 const struct afs_wait_mode *); 668 669/* 670 * vlocation.c 671 */ 672#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 673 674extern int __init afs_vlocation_update_init(void); 675extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 676 struct key *, 677 const char *, size_t); 678extern void afs_put_vlocation(struct afs_vlocation *); 679extern void afs_vlocation_purge(void); 680 681/* 682 * vnode.c 683 */ 684static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 685{ 686 return container_of(inode, struct afs_vnode, vfs_inode); 687} 688 689static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 690{ 691 return &vnode->vfs_inode; 692} 693 694extern void afs_vnode_finalise_status_update(struct afs_vnode *, 695 struct afs_server *); 696extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 697 struct key *); 698extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 699 off_t, size_t, struct page *); 700extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 701 umode_t, struct afs_fid *, struct afs_file_status *, 702 struct afs_callback *, struct afs_server **); 703extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 704 bool); 705extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 706 const char *); 707extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 708 const char *, struct afs_fid *, 709 struct afs_file_status *, struct afs_server **); 710extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 711 struct key *, const char *, const char *); 712extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t, 713 unsigned, unsigned); 714extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *); 715extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *, 716 struct afs_volume_status *); 717extern int afs_vnode_set_lock(struct afs_vnode *, struct key *, 718 afs_lock_type_t); 719extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *); 720extern int afs_vnode_release_lock(struct afs_vnode *, struct key *); 721 722/* 723 * volume.c 724 */ 725#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 726 727extern void afs_put_volume(struct afs_volume *); 728extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 729extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 730extern int afs_volume_release_fileserver(struct afs_vnode *, 731 struct afs_server *, int); 732 733/* 734 * write.c 735 */ 736extern int afs_set_page_dirty(struct page *); 737extern void afs_put_writeback(struct afs_writeback *); 738extern int afs_write_begin(struct file *file, struct address_space *mapping, 739 loff_t pos, unsigned len, unsigned flags, 740 struct page **pagep, void **fsdata); 741extern int afs_write_end(struct file *file, struct address_space *mapping, 742 loff_t pos, unsigned len, unsigned copied, 743 struct page *page, void *fsdata); 744extern int afs_writepage(struct page *, struct writeback_control *); 745extern int afs_writepages(struct address_space *, struct writeback_control *); 746extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 747extern ssize_t afs_file_write(struct kiocb *, const struct iovec *, 748 unsigned long, loff_t); 749extern int afs_writeback_all(struct afs_vnode *); 750extern int afs_fsync(struct file *, int); 751 752 753/*****************************************************************************/ 754/* 755 * debug tracing 756 */ 757extern unsigned afs_debug; 758 759#define dbgprintk(FMT,...) \ 760 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 761 762#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 763#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 764#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 765 766 767#if defined(__KDEBUG) 768#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 769#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 770#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 771 772#elif defined(CONFIG_AFS_DEBUG) 773#define AFS_DEBUG_KENTER 0x01 774#define AFS_DEBUG_KLEAVE 0x02 775#define AFS_DEBUG_KDEBUG 0x04 776 777#define _enter(FMT,...) \ 778do { \ 779 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 780 kenter(FMT,##__VA_ARGS__); \ 781} while (0) 782 783#define _leave(FMT,...) \ 784do { \ 785 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 786 kleave(FMT,##__VA_ARGS__); \ 787} while (0) 788 789#define _debug(FMT,...) \ 790do { \ 791 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 792 kdebug(FMT,##__VA_ARGS__); \ 793} while (0) 794 795#else 796#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 797#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 798#define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 799#endif 800 801/* 802 * debug assertion checking 803 */ 804 805#define ASSERT(X) \ 806do { \ 807 if (unlikely(!(X))) { \ 808 printk(KERN_ERR "\n"); \ 809 printk(KERN_ERR "AFS: Assertion failed\n"); \ 810 BUG(); \ 811 } \ 812} while(0) 813 814#define ASSERTCMP(X, OP, Y) \ 815do { \ 816 if (unlikely(!((X) OP (Y)))) { \ 817 printk(KERN_ERR "\n"); \ 818 printk(KERN_ERR "AFS: Assertion failed\n"); \ 819 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 820 (unsigned long)(X), (unsigned long)(Y)); \ 821 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 822 (unsigned long)(X), (unsigned long)(Y)); \ 823 BUG(); \ 824 } \ 825} while(0) 826 827#define ASSERTRANGE(L, OP1, N, OP2, H) \ 828do { \ 829 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 830 printk(KERN_ERR "\n"); \ 831 printk(KERN_ERR "AFS: Assertion failed\n"); \ 832 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 833 (unsigned long)(L), (unsigned long)(N), \ 834 (unsigned long)(H)); \ 835 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 836 (unsigned long)(L), (unsigned long)(N), \ 837 (unsigned long)(H)); \ 838 BUG(); \ 839 } \ 840} while(0) 841 842#define ASSERTIF(C, X) \ 843do { \ 844 if (unlikely((C) && !(X))) { \ 845 printk(KERN_ERR "\n"); \ 846 printk(KERN_ERR "AFS: Assertion failed\n"); \ 847 BUG(); \ 848 } \ 849} while(0) 850 851#define ASSERTIFCMP(C, X, OP, Y) \ 852do { \ 853 if (unlikely((C) && !((X) OP (Y)))) { \ 854 printk(KERN_ERR "\n"); \ 855 printk(KERN_ERR "AFS: Assertion failed\n"); \ 856 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 857 (unsigned long)(X), (unsigned long)(Y)); \ 858 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 859 (unsigned long)(X), (unsigned long)(Y)); \ 860 BUG(); \ 861 } \ 862} while(0) 863