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/ktime.h> 15 #include <linux/fs.h> 16 #include <linux/pagemap.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 #include <linux/uuid.h> 24 #include <net/af_rxrpc.h> 25 26 #include "afs.h" 27 #include "afs_vl.h" 28 29 #define AFS_CELL_MAX_ADDRS 15 30 31 struct pagevec; 32 struct afs_call; 33 34 typedef enum { 35 AFS_VL_NEW, /* new, uninitialised record */ 36 AFS_VL_CREATING, /* creating record */ 37 AFS_VL_VALID, /* record is pending */ 38 AFS_VL_NO_VOLUME, /* no such volume available */ 39 AFS_VL_UPDATING, /* update in progress */ 40 AFS_VL_VOLUME_DELETED, /* volume was deleted */ 41 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */ 42 } __attribute__((packed)) afs_vlocation_state_t; 43 44 struct afs_mount_params { 45 bool rwpath; /* T if the parent should be considered R/W */ 46 bool force; /* T to force cell type */ 47 bool autocell; /* T if set auto mount operation */ 48 afs_voltype_t type; /* type of volume requested */ 49 int volnamesz; /* size of volume name */ 50 const char *volname; /* name of volume to mount */ 51 struct afs_cell *cell; /* cell in which to find volume */ 52 struct afs_volume *volume; /* volume record */ 53 struct key *key; /* key to use for secure mounting */ 54 }; 55 56 enum afs_call_state { 57 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */ 58 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */ 59 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */ 60 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */ 61 AFS_CALL_REPLYING, /* replying to incoming call */ 62 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */ 63 AFS_CALL_COMPLETE, /* Completed or failed */ 64 }; 65 /* 66 * a record of an in-progress RxRPC call 67 */ 68 struct afs_call { 69 const struct afs_call_type *type; /* type of call */ 70 wait_queue_head_t waitq; /* processes awaiting completion */ 71 struct work_struct async_work; /* async I/O processor */ 72 struct work_struct work; /* actual work processor */ 73 struct rxrpc_call *rxcall; /* RxRPC call handle */ 74 struct key *key; /* security for this call */ 75 struct afs_server *server; /* server affected by incoming CM call */ 76 void *request; /* request data (first part) */ 77 struct address_space *mapping; /* page set */ 78 struct afs_writeback *wb; /* writeback being performed */ 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 pgoff_t first; /* first page in mapping to deal with */ 85 pgoff_t last; /* last page in mapping to deal with */ 86 size_t offset; /* offset into received data store */ 87 atomic_t usage; 88 enum afs_call_state state; 89 int error; /* error code */ 90 u32 abort_code; /* Remote abort ID or 0 */ 91 unsigned request_size; /* size of request data */ 92 unsigned reply_max; /* maximum size of reply */ 93 unsigned first_offset; /* offset into mapping[first] */ 94 union { 95 unsigned last_to; /* amount of mapping[last] */ 96 unsigned count2; /* count used in unmarshalling */ 97 }; 98 unsigned char unmarshall; /* unmarshalling phase */ 99 bool incoming; /* T if incoming call */ 100 bool send_pages; /* T if data from mapping should be sent */ 101 bool need_attention; /* T if RxRPC poked us */ 102 bool async; /* T if asynchronous */ 103 bool upgrade; /* T to request service upgrade */ 104 u16 service_id; /* RxRPC service ID to call */ 105 __be16 port; /* target UDP port */ 106 u32 operation_ID; /* operation ID for an incoming call */ 107 u32 count; /* count for use in unmarshalling */ 108 __be32 tmp; /* place to extract temporary data */ 109 afs_dataversion_t store_version; /* updated version expected from store */ 110 }; 111 112 struct afs_call_type { 113 const char *name; 114 115 /* deliver request or reply data to an call 116 * - returning an error will cause the call to be aborted 117 */ 118 int (*deliver)(struct afs_call *call); 119 120 /* map an abort code to an error number */ 121 int (*abort_to_error)(u32 abort_code); 122 123 /* clean up a call */ 124 void (*destructor)(struct afs_call *call); 125 126 /* Work function */ 127 void (*work)(struct work_struct *work); 128 }; 129 130 /* 131 * Record of an outstanding read operation on a vnode. 132 */ 133 struct afs_read { 134 loff_t pos; /* Where to start reading */ 135 loff_t len; /* How much we're asking for */ 136 loff_t actual_len; /* How much we're actually getting */ 137 loff_t remain; /* Amount remaining */ 138 atomic_t usage; 139 unsigned int index; /* Which page we're reading into */ 140 unsigned int nr_pages; 141 void (*page_done)(struct afs_call *, struct afs_read *); 142 struct page *pages[]; 143 }; 144 145 /* 146 * record of an outstanding writeback on a vnode 147 */ 148 struct afs_writeback { 149 struct list_head link; /* link in vnode->writebacks */ 150 struct work_struct writer; /* work item to perform the writeback */ 151 struct afs_vnode *vnode; /* vnode to which this write applies */ 152 struct key *key; /* owner of this write */ 153 wait_queue_head_t waitq; /* completion and ready wait queue */ 154 pgoff_t first; /* first page in batch */ 155 pgoff_t point; /* last page in current store op */ 156 pgoff_t last; /* last page in batch (inclusive) */ 157 unsigned offset_first; /* offset into first page of start of write */ 158 unsigned to_last; /* offset into last page of end of write */ 159 int num_conflicts; /* count of conflicting writes in list */ 160 int usage; 161 bool conflicts; /* T if has dependent conflicts */ 162 enum { 163 AFS_WBACK_SYNCING, /* synchronisation being performed */ 164 AFS_WBACK_PENDING, /* write pending */ 165 AFS_WBACK_CONFLICTING, /* conflicting writes posted */ 166 AFS_WBACK_WRITING, /* writing back */ 167 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */ 168 } state __attribute__((packed)); 169 }; 170 171 /* 172 * AFS superblock private data 173 * - there's one superblock per volume 174 */ 175 struct afs_super_info { 176 struct afs_volume *volume; /* volume record */ 177 char rwparent; /* T if parent is R/W AFS volume */ 178 }; 179 180 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb) 181 { 182 return sb->s_fs_info; 183 } 184 185 extern struct file_system_type afs_fs_type; 186 187 /* 188 * entry in the cached cell catalogue 189 */ 190 struct afs_cache_cell { 191 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */ 192 struct in_addr vl_servers[15]; /* cached cell VL servers */ 193 }; 194 195 /* 196 * AFS cell record 197 */ 198 struct afs_cell { 199 atomic_t usage; 200 struct list_head link; /* main cell list link */ 201 struct key *anonymous_key; /* anonymous user key for this cell */ 202 struct list_head proc_link; /* /proc cell list link */ 203 #ifdef CONFIG_AFS_FSCACHE 204 struct fscache_cookie *cache; /* caching cookie */ 205 #endif 206 207 /* server record management */ 208 rwlock_t servers_lock; /* active server list lock */ 209 struct list_head servers; /* active server list */ 210 211 /* volume location record management */ 212 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ 213 struct list_head vl_list; /* cell's active VL record list */ 214 spinlock_t vl_lock; /* vl_list lock */ 215 unsigned short vl_naddrs; /* number of VL servers in addr list */ 216 unsigned short vl_curr_svix; /* current server index */ 217 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ 218 219 char name[0]; /* cell name - must go last */ 220 }; 221 222 /* 223 * entry in the cached volume location catalogue 224 */ 225 struct afs_cache_vlocation { 226 /* volume name (lowercase, padded with NULs) */ 227 uint8_t name[AFS_MAXVOLNAME + 1]; 228 229 uint8_t nservers; /* number of entries used in servers[] */ 230 uint8_t vidmask; /* voltype mask for vid[] */ 231 uint8_t srvtmask[8]; /* voltype masks for servers[] */ 232 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ 233 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ 234 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ 235 236 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ 237 struct in_addr servers[8]; /* fileserver addresses */ 238 time_t rtime; /* last retrieval time */ 239 }; 240 241 /* 242 * volume -> vnode hash table entry 243 */ 244 struct afs_cache_vhash { 245 afs_voltype_t vtype; /* which volume variation */ 246 uint8_t hash_bucket; /* which hash bucket this represents */ 247 } __attribute__((packed)); 248 249 /* 250 * AFS volume location record 251 */ 252 struct afs_vlocation { 253 atomic_t usage; 254 time64_t time_of_death; /* time at which put reduced usage to 0 */ 255 struct list_head link; /* link in cell volume location list */ 256 struct list_head grave; /* link in master graveyard list */ 257 struct list_head update; /* link in master update list */ 258 struct afs_cell *cell; /* cell to which volume belongs */ 259 #ifdef CONFIG_AFS_FSCACHE 260 struct fscache_cookie *cache; /* caching cookie */ 261 #endif 262 struct afs_cache_vlocation vldb; /* volume information DB record */ 263 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ 264 wait_queue_head_t waitq; /* status change waitqueue */ 265 time64_t update_at; /* time at which record should be updated */ 266 spinlock_t lock; /* access lock */ 267 afs_vlocation_state_t state; /* volume location state */ 268 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ 269 unsigned short upd_busy_cnt; /* EBUSY count during update */ 270 bool valid; /* T if valid */ 271 }; 272 273 /* 274 * AFS fileserver record 275 */ 276 struct afs_server { 277 atomic_t usage; 278 time64_t time_of_death; /* time at which put reduced usage to 0 */ 279 struct in_addr addr; /* server address */ 280 struct afs_cell *cell; /* cell in which server resides */ 281 struct list_head link; /* link in cell's server list */ 282 struct list_head grave; /* link in master graveyard list */ 283 struct rb_node master_rb; /* link in master by-addr tree */ 284 struct rw_semaphore sem; /* access lock */ 285 286 /* file service access */ 287 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */ 288 unsigned long fs_act_jif; /* time at which last activity occurred */ 289 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */ 290 spinlock_t fs_lock; /* access lock */ 291 int fs_state; /* 0 or reason FS currently marked dead (-errno) */ 292 293 /* callback promise management */ 294 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */ 295 struct delayed_work cb_updater; /* callback updater */ 296 struct delayed_work cb_break_work; /* collected break dispatcher */ 297 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */ 298 spinlock_t cb_lock; /* access lock */ 299 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */ 300 atomic_t cb_break_n; /* number of pending breaks */ 301 u8 cb_break_head; /* head of callback breaking ring */ 302 u8 cb_break_tail; /* tail of callback breaking ring */ 303 }; 304 305 /* 306 * AFS volume access record 307 */ 308 struct afs_volume { 309 atomic_t usage; 310 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ 311 struct afs_vlocation *vlocation; /* volume location */ 312 #ifdef CONFIG_AFS_FSCACHE 313 struct fscache_cookie *cache; /* caching cookie */ 314 #endif 315 afs_volid_t vid; /* volume ID */ 316 afs_voltype_t type; /* type of volume */ 317 char type_force; /* force volume type (suppress R/O -> R/W) */ 318 unsigned short nservers; /* number of server slots filled */ 319 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ 320 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ 321 struct rw_semaphore server_sem; /* lock for accessing current server */ 322 }; 323 324 /* 325 * vnode catalogue entry 326 */ 327 struct afs_cache_vnode { 328 afs_vnodeid_t vnode_id; /* vnode ID */ 329 unsigned vnode_unique; /* vnode ID uniquifier */ 330 afs_dataversion_t data_version; /* data version */ 331 }; 332 333 /* 334 * AFS inode private data 335 */ 336 struct afs_vnode { 337 struct inode vfs_inode; /* the VFS's inode record */ 338 339 struct afs_volume *volume; /* volume on which vnode resides */ 340 struct afs_server *server; /* server currently supplying this file */ 341 struct afs_fid fid; /* the file identifier for this inode */ 342 struct afs_file_status status; /* AFS status info for this file */ 343 #ifdef CONFIG_AFS_FSCACHE 344 struct fscache_cookie *cache; /* caching cookie */ 345 #endif 346 struct afs_permits *permits; /* cache of permits so far obtained */ 347 struct mutex permits_lock; /* lock for altering permits list */ 348 struct mutex validate_lock; /* lock for validating this vnode */ 349 wait_queue_head_t update_waitq; /* status fetch waitqueue */ 350 int update_cnt; /* number of outstanding ops that will update the 351 * status */ 352 spinlock_t writeback_lock; /* lock for writebacks */ 353 spinlock_t lock; /* waitqueue/flags lock */ 354 unsigned long flags; 355 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */ 356 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */ 357 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */ 358 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */ 359 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */ 360 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */ 361 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */ 362 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */ 363 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */ 364 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */ 365 #define AFS_VNODE_AUTOCELL 10 /* set if Vnode is an auto mount point */ 366 #define AFS_VNODE_PSEUDODIR 11 /* set if Vnode is a pseudo directory */ 367 368 long acl_order; /* ACL check count (callback break count) */ 369 370 struct list_head writebacks; /* alterations in pagecache that need writing */ 371 struct list_head pending_locks; /* locks waiting to be granted */ 372 struct list_head granted_locks; /* locks granted on this file */ 373 struct delayed_work lock_work; /* work to be done in locking */ 374 struct key *unlock_key; /* key to be used in unlocking */ 375 376 /* outstanding callback notification on this file */ 377 struct rb_node server_rb; /* link in server->fs_vnodes */ 378 struct rb_node cb_promise; /* link in server->cb_promises */ 379 struct work_struct cb_broken_work; /* work to be done on callback break */ 380 time64_t cb_expires; /* time at which callback expires */ 381 time64_t cb_expires_at; /* time used to order cb_promise */ 382 unsigned cb_version; /* callback version */ 383 unsigned cb_expiry; /* callback expiry time */ 384 afs_callback_type_t cb_type; /* type of callback */ 385 bool cb_promised; /* true if promise still holds */ 386 }; 387 388 /* 389 * cached security record for one user's attempt to access a vnode 390 */ 391 struct afs_permit { 392 struct key *key; /* RxRPC ticket holding a security context */ 393 afs_access_t access_mask; /* access mask for this key */ 394 }; 395 396 /* 397 * cache of security records from attempts to access a vnode 398 */ 399 struct afs_permits { 400 struct rcu_head rcu; /* disposal procedure */ 401 int count; /* number of records */ 402 struct afs_permit permits[0]; /* the permits so far examined */ 403 }; 404 405 /* 406 * record of one of a system's set of network interfaces 407 */ 408 struct afs_interface { 409 struct in_addr address; /* IPv4 address bound to interface */ 410 struct in_addr netmask; /* netmask applied to address */ 411 unsigned mtu; /* MTU of interface */ 412 }; 413 414 struct afs_uuid { 415 __be32 time_low; /* low part of timestamp */ 416 __be16 time_mid; /* mid part of timestamp */ 417 __be16 time_hi_and_version; /* high part of timestamp and version */ 418 __u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */ 419 __u8 clock_seq_low; /* clock seq low */ 420 __u8 node[6]; /* spatially unique node ID (MAC addr) */ 421 }; 422 423 /*****************************************************************************/ 424 /* 425 * cache.c 426 */ 427 #ifdef CONFIG_AFS_FSCACHE 428 extern struct fscache_netfs afs_cache_netfs; 429 extern struct fscache_cookie_def afs_cell_cache_index_def; 430 extern struct fscache_cookie_def afs_vlocation_cache_index_def; 431 extern struct fscache_cookie_def afs_volume_cache_index_def; 432 extern struct fscache_cookie_def afs_vnode_cache_index_def; 433 #else 434 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL) 435 #define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL) 436 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL) 437 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL) 438 #endif 439 440 /* 441 * callback.c 442 */ 443 extern void afs_init_callback_state(struct afs_server *); 444 extern void afs_broken_callback_work(struct work_struct *); 445 extern void afs_break_callbacks(struct afs_server *, size_t, 446 struct afs_callback[]); 447 extern void afs_discard_callback_on_delete(struct afs_vnode *); 448 extern void afs_give_up_callback(struct afs_vnode *); 449 extern void afs_dispatch_give_up_callbacks(struct work_struct *); 450 extern void afs_flush_callback_breaks(struct afs_server *); 451 extern int __init afs_callback_update_init(void); 452 extern void afs_callback_update_kill(void); 453 454 /* 455 * cell.c 456 */ 457 extern struct rw_semaphore afs_proc_cells_sem; 458 extern struct list_head afs_proc_cells; 459 460 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) 461 extern int afs_cell_init(char *); 462 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool); 463 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool); 464 extern struct afs_cell *afs_grab_cell(struct afs_cell *); 465 extern void afs_put_cell(struct afs_cell *); 466 extern void afs_cell_purge(void); 467 468 /* 469 * cmservice.c 470 */ 471 extern bool afs_cm_incoming_call(struct afs_call *); 472 473 /* 474 * dir.c 475 */ 476 extern const struct inode_operations afs_dir_inode_operations; 477 extern const struct dentry_operations afs_fs_dentry_operations; 478 extern const struct file_operations afs_dir_file_operations; 479 480 /* 481 * file.c 482 */ 483 extern const struct address_space_operations afs_fs_aops; 484 extern const struct inode_operations afs_file_inode_operations; 485 extern const struct file_operations afs_file_operations; 486 487 extern int afs_open(struct inode *, struct file *); 488 extern int afs_release(struct inode *, struct file *); 489 extern int afs_page_filler(void *, struct page *); 490 extern void afs_put_read(struct afs_read *); 491 492 /* 493 * flock.c 494 */ 495 extern void __exit afs_kill_lock_manager(void); 496 extern void afs_lock_work(struct work_struct *); 497 extern void afs_lock_may_be_available(struct afs_vnode *); 498 extern int afs_lock(struct file *, int, struct file_lock *); 499 extern int afs_flock(struct file *, int, struct file_lock *); 500 501 /* 502 * fsclient.c 503 */ 504 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *, 505 struct afs_vnode *, struct afs_volsync *, 506 bool); 507 extern int afs_fs_give_up_callbacks(struct afs_server *, bool); 508 extern int afs_fs_fetch_data(struct afs_server *, struct key *, 509 struct afs_vnode *, struct afs_read *, bool); 510 extern int afs_fs_create(struct afs_server *, struct key *, 511 struct afs_vnode *, const char *, umode_t, 512 struct afs_fid *, struct afs_file_status *, 513 struct afs_callback *, bool); 514 extern int afs_fs_remove(struct afs_server *, struct key *, 515 struct afs_vnode *, const char *, bool, bool); 516 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *, 517 struct afs_vnode *, const char *, bool); 518 extern int afs_fs_symlink(struct afs_server *, struct key *, 519 struct afs_vnode *, const char *, const char *, 520 struct afs_fid *, struct afs_file_status *, bool); 521 extern int afs_fs_rename(struct afs_server *, struct key *, 522 struct afs_vnode *, const char *, 523 struct afs_vnode *, const char *, bool); 524 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *, 525 pgoff_t, pgoff_t, unsigned, unsigned, bool); 526 extern int afs_fs_setattr(struct afs_server *, struct key *, 527 struct afs_vnode *, struct iattr *, bool); 528 extern int afs_fs_get_volume_status(struct afs_server *, struct key *, 529 struct afs_vnode *, 530 struct afs_volume_status *, bool); 531 extern int afs_fs_set_lock(struct afs_server *, struct key *, 532 struct afs_vnode *, afs_lock_type_t, bool); 533 extern int afs_fs_extend_lock(struct afs_server *, struct key *, 534 struct afs_vnode *, bool); 535 extern int afs_fs_release_lock(struct afs_server *, struct key *, 536 struct afs_vnode *, bool); 537 538 /* 539 * inode.c 540 */ 541 extern struct inode *afs_iget_autocell(struct inode *, const char *, int, 542 struct key *); 543 extern struct inode *afs_iget(struct super_block *, struct key *, 544 struct afs_fid *, struct afs_file_status *, 545 struct afs_callback *); 546 extern void afs_zap_data(struct afs_vnode *); 547 extern int afs_validate(struct afs_vnode *, struct key *); 548 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int); 549 extern int afs_setattr(struct dentry *, struct iattr *); 550 extern void afs_evict_inode(struct inode *); 551 extern int afs_drop_inode(struct inode *); 552 553 /* 554 * main.c 555 */ 556 extern struct workqueue_struct *afs_wq; 557 extern struct afs_uuid afs_uuid; 558 559 /* 560 * misc.c 561 */ 562 extern int afs_abort_to_error(u32); 563 564 /* 565 * mntpt.c 566 */ 567 extern const struct inode_operations afs_mntpt_inode_operations; 568 extern const struct inode_operations afs_autocell_inode_operations; 569 extern const struct file_operations afs_mntpt_file_operations; 570 571 extern struct vfsmount *afs_d_automount(struct path *); 572 extern void afs_mntpt_kill_timer(void); 573 574 /* 575 * netdevices.c 576 */ 577 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); 578 579 /* 580 * proc.c 581 */ 582 extern int afs_proc_init(void); 583 extern void afs_proc_cleanup(void); 584 extern int afs_proc_cell_setup(struct afs_cell *); 585 extern void afs_proc_cell_remove(struct afs_cell *); 586 587 /* 588 * rxrpc.c 589 */ 590 extern struct socket *afs_socket; 591 extern atomic_t afs_outstanding_calls; 592 593 extern int afs_open_socket(void); 594 extern void afs_close_socket(void); 595 extern void afs_put_call(struct afs_call *); 596 extern int afs_queue_call_work(struct afs_call *); 597 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, bool); 598 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *, 599 size_t, size_t); 600 extern void afs_flat_call_destructor(struct afs_call *); 601 extern void afs_send_empty_reply(struct afs_call *); 602 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t); 603 extern int afs_extract_data(struct afs_call *, void *, size_t, bool); 604 605 static inline int afs_transfer_reply(struct afs_call *call) 606 { 607 return afs_extract_data(call, call->buffer, call->reply_max, false); 608 } 609 610 /* 611 * security.c 612 */ 613 extern void afs_clear_permits(struct afs_vnode *); 614 extern void afs_cache_permit(struct afs_vnode *, struct key *, long); 615 extern void afs_zap_permits(struct rcu_head *); 616 extern struct key *afs_request_key(struct afs_cell *); 617 extern int afs_permission(struct inode *, int); 618 619 /* 620 * server.c 621 */ 622 extern spinlock_t afs_server_peer_lock; 623 624 #define afs_get_server(S) \ 625 do { \ 626 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \ 627 atomic_inc(&(S)->usage); \ 628 } while(0) 629 630 extern struct afs_server *afs_lookup_server(struct afs_cell *, 631 const struct in_addr *); 632 extern struct afs_server *afs_find_server(const struct sockaddr_rxrpc *); 633 extern void afs_put_server(struct afs_server *); 634 extern void __exit afs_purge_servers(void); 635 636 /* 637 * super.c 638 */ 639 extern int afs_fs_init(void); 640 extern void afs_fs_exit(void); 641 642 /* 643 * vlclient.c 644 */ 645 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *, 646 const char *, struct afs_cache_vlocation *, 647 bool); 648 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *, 649 afs_volid_t, afs_voltype_t, 650 struct afs_cache_vlocation *, bool); 651 652 /* 653 * vlocation.c 654 */ 655 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) 656 657 extern int __init afs_vlocation_update_init(void); 658 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *, 659 struct key *, 660 const char *, size_t); 661 extern void afs_put_vlocation(struct afs_vlocation *); 662 extern void afs_vlocation_purge(void); 663 664 /* 665 * vnode.c 666 */ 667 static inline struct afs_vnode *AFS_FS_I(struct inode *inode) 668 { 669 return container_of(inode, struct afs_vnode, vfs_inode); 670 } 671 672 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode) 673 { 674 return &vnode->vfs_inode; 675 } 676 677 extern void afs_vnode_finalise_status_update(struct afs_vnode *, 678 struct afs_server *); 679 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *, 680 struct key *); 681 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *, 682 struct afs_read *); 683 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *, 684 umode_t, struct afs_fid *, struct afs_file_status *, 685 struct afs_callback *, struct afs_server **); 686 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *, 687 bool); 688 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *, 689 const char *); 690 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *, 691 const char *, struct afs_fid *, 692 struct afs_file_status *, struct afs_server **); 693 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *, 694 struct key *, const char *, const char *); 695 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t, 696 unsigned, unsigned); 697 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *); 698 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *, 699 struct afs_volume_status *); 700 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *, 701 afs_lock_type_t); 702 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *); 703 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *); 704 705 /* 706 * volume.c 707 */ 708 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) 709 710 extern void afs_put_volume(struct afs_volume *); 711 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *); 712 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *); 713 extern int afs_volume_release_fileserver(struct afs_vnode *, 714 struct afs_server *, int); 715 716 /* 717 * write.c 718 */ 719 extern int afs_set_page_dirty(struct page *); 720 extern void afs_put_writeback(struct afs_writeback *); 721 extern int afs_write_begin(struct file *file, struct address_space *mapping, 722 loff_t pos, unsigned len, unsigned flags, 723 struct page **pagep, void **fsdata); 724 extern int afs_write_end(struct file *file, struct address_space *mapping, 725 loff_t pos, unsigned len, unsigned copied, 726 struct page *page, void *fsdata); 727 extern int afs_writepage(struct page *, struct writeback_control *); 728 extern int afs_writepages(struct address_space *, struct writeback_control *); 729 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *); 730 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 731 extern int afs_writeback_all(struct afs_vnode *); 732 extern int afs_flush(struct file *, fl_owner_t); 733 extern int afs_fsync(struct file *, loff_t, loff_t, int); 734 735 /* 736 * xattr.c 737 */ 738 extern const struct xattr_handler *afs_xattr_handlers[]; 739 extern ssize_t afs_listxattr(struct dentry *, char *, size_t); 740 741 /*****************************************************************************/ 742 /* 743 * debug tracing 744 */ 745 #include <trace/events/afs.h> 746 747 extern unsigned afs_debug; 748 749 #define dbgprintk(FMT,...) \ 750 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 751 752 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 753 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 754 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 755 756 757 #if defined(__KDEBUG) 758 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 759 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 760 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 761 762 #elif defined(CONFIG_AFS_DEBUG) 763 #define AFS_DEBUG_KENTER 0x01 764 #define AFS_DEBUG_KLEAVE 0x02 765 #define AFS_DEBUG_KDEBUG 0x04 766 767 #define _enter(FMT,...) \ 768 do { \ 769 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ 770 kenter(FMT,##__VA_ARGS__); \ 771 } while (0) 772 773 #define _leave(FMT,...) \ 774 do { \ 775 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ 776 kleave(FMT,##__VA_ARGS__); \ 777 } while (0) 778 779 #define _debug(FMT,...) \ 780 do { \ 781 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ 782 kdebug(FMT,##__VA_ARGS__); \ 783 } while (0) 784 785 #else 786 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 787 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 788 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 789 #endif 790 791 /* 792 * debug assertion checking 793 */ 794 #if 1 // defined(__KDEBUGALL) 795 796 #define ASSERT(X) \ 797 do { \ 798 if (unlikely(!(X))) { \ 799 printk(KERN_ERR "\n"); \ 800 printk(KERN_ERR "AFS: Assertion failed\n"); \ 801 BUG(); \ 802 } \ 803 } while(0) 804 805 #define ASSERTCMP(X, OP, Y) \ 806 do { \ 807 if (unlikely(!((X) OP (Y)))) { \ 808 printk(KERN_ERR "\n"); \ 809 printk(KERN_ERR "AFS: Assertion failed\n"); \ 810 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 811 (unsigned long)(X), (unsigned long)(Y)); \ 812 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 813 (unsigned long)(X), (unsigned long)(Y)); \ 814 BUG(); \ 815 } \ 816 } while(0) 817 818 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 819 do { \ 820 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ 821 printk(KERN_ERR "\n"); \ 822 printk(KERN_ERR "AFS: Assertion failed\n"); \ 823 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ 824 (unsigned long)(L), (unsigned long)(N), \ 825 (unsigned long)(H)); \ 826 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ 827 (unsigned long)(L), (unsigned long)(N), \ 828 (unsigned long)(H)); \ 829 BUG(); \ 830 } \ 831 } while(0) 832 833 #define ASSERTIF(C, X) \ 834 do { \ 835 if (unlikely((C) && !(X))) { \ 836 printk(KERN_ERR "\n"); \ 837 printk(KERN_ERR "AFS: Assertion failed\n"); \ 838 BUG(); \ 839 } \ 840 } while(0) 841 842 #define ASSERTIFCMP(C, X, OP, Y) \ 843 do { \ 844 if (unlikely((C) && !((X) OP (Y)))) { \ 845 printk(KERN_ERR "\n"); \ 846 printk(KERN_ERR "AFS: Assertion failed\n"); \ 847 printk(KERN_ERR "%lu " #OP " %lu is false\n", \ 848 (unsigned long)(X), (unsigned long)(Y)); \ 849 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ 850 (unsigned long)(X), (unsigned long)(Y)); \ 851 BUG(); \ 852 } \ 853 } while(0) 854 855 #else 856 857 #define ASSERT(X) \ 858 do { \ 859 } while(0) 860 861 #define ASSERTCMP(X, OP, Y) \ 862 do { \ 863 } while(0) 864 865 #define ASSERTRANGE(L, OP1, N, OP2, H) \ 866 do { \ 867 } while(0) 868 869 #define ASSERTIF(C, X) \ 870 do { \ 871 } while(0) 872 873 #define ASSERTIFCMP(C, X, OP, Y) \ 874 do { \ 875 } while(0) 876 877 #endif /* __KDEBUGALL */ 878