?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / fs / afs / internal.h
blob2acfb90d3dd2c383ac678c1e36be53154f6f5da0
1 /* internal AFS stuff
2 *
3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/compiler.h>
13 #include <linux/kernel.h>
14 #include <linux/fs.h>
15 #include <linux/pagemap.h>
16 #include <linux/skbuff.h>
17 #include <linux/rxrpc.h>
18 #include <linux/key.h>
19 #include <linux/workqueue.h>
20 #include <linux/sched.h>
21 #include <linux/fscache.h>
22 #include <linux/backing-dev.h>
23
24 #include "afs.h"
25 #include "afs_vl.h"
26
27 #define AFS_CELL_MAX_ADDRS 15
28
29 struct pagevec;
30 struct afs_call;
31
32 typedef enum {
33 AFS_VL_NEW, /* new, uninitialised record */
34 AFS_VL_CREATING, /* creating record */
35 AFS_VL_VALID, /* record is pending */
36 AFS_VL_NO_VOLUME, /* no such volume available */
37 AFS_VL_UPDATING, /* update in progress */
38 AFS_VL_VOLUME_DELETED, /* volume was deleted */
39 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */
40 } __attribute__((packed)) afs_vlocation_state_t;
41
42 struct afs_mount_params {
43 bool rwpath; /* T if the parent should be considered R/W */
44 bool force; /* T to force cell type */
45 bool autocell; /* T if set auto mount operation */
46 afs_voltype_t type; /* type of volume requested */
47 int volnamesz; /* size of volume name */
48 const char *volname; /* name of volume to mount */
49 struct afs_cell *cell; /* cell in which to find volume */
50 struct afs_volume *volume; /* volume record */
51 struct key *key; /* key to use for secure mounting */
52 };
53
54 /*
55 * definition of how to wait for the completion of an operation
56 */
57 struct afs_wait_mode {
58 /* RxRPC received message notification */
59 void (*rx_wakeup)(struct afs_call *call);
60
61 /* synchronous call waiter and call dispatched notification */
62 int (*wait)(struct afs_call *call);
63
64 /* asynchronous call completion */
65 void (*async_complete)(void *reply, int error);
66 };
67
68 extern const struct afs_wait_mode afs_sync_call;
69 extern const struct afs_wait_mode afs_async_call;
70
71 /*
72 * a record of an in-progress RxRPC call
73 */
74 struct afs_call {
75 const struct afs_call_type *type; /* type of call */
76 const struct afs_wait_mode *wait_mode; /* completion wait mode */
77 wait_queue_head_t waitq; /* processes awaiting completion */
78 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
124 struct 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 */
143 struct 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 */
170 struct afs_super_info {
171 struct afs_volume *volume; /* volume record */
172 char rwparent; /* T if parent is R/W AFS volume */
173 };
174
175 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
176 {
177 return sb->s_fs_info;
178 }
179
180 extern struct file_system_type afs_fs_type;
181
182 /*
183 * entry in the cached cell catalogue
184 */
185 struct 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 */
193 struct 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 */
221 struct afs_cache_vlocation {
222 /* volume name (lowercase, padded with NULs) */
223 uint8_t name[AFS_MAXVOLNAME + 1];
224
225 uint8_t nservers; /* number of entries used in servers[] */
226 uint8_t vidmask; /* voltype mask for vid[] */
227 uint8_t srvtmask[8]; /* voltype masks for servers[] */
228 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
229 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
230 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
231
232 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
233 struct in_addr servers[8]; /* fileserver addresses */
234 time_t rtime; /* last retrieval time */
235 };
236
237 /*
238 * volume -> vnode hash table entry
239 */
240 struct afs_cache_vhash {
241 afs_voltype_t vtype; /* which volume variation */
242 uint8_t hash_bucket; /* which hash bucket this represents */
243 } __attribute__((packed));
244
245 /*
246 * AFS volume location record
247 */
248 struct afs_vlocation {
249 atomic_t usage;
250 time_t time_of_death; /* time at which put reduced usage to 0 */
251 struct list_head link; /* link in cell volume location list */
252 struct list_head grave; /* link in master graveyard list */
253 struct list_head update; /* link in master update list */
254 struct afs_cell *cell; /* cell to which volume belongs */
255 #ifdef CONFIG_AFS_FSCACHE
256 struct fscache_cookie *cache; /* caching cookie */
257 #endif
258 struct afs_cache_vlocation vldb; /* volume information DB record */
259 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
260 wait_queue_head_t waitq; /* status change waitqueue */
261 time_t update_at; /* time at which record should be updated */
262 spinlock_t lock; /* access lock */
263 afs_vlocation_state_t state; /* volume location state */
264 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
265 unsigned short upd_busy_cnt; /* EBUSY count during update */
266 bool valid; /* T if valid */
267 };
268
269 /*
270 * AFS fileserver record
271 */
272 struct afs_server {
273 atomic_t usage;
274 time_t time_of_death; /* time at which put reduced usage to 0 */
275 struct in_addr addr; /* server address */
276 struct afs_cell *cell; /* cell in which server resides */
277 struct list_head link; /* link in cell's server list */
278 struct list_head grave; /* link in master graveyard list */
279 struct rb_node master_rb; /* link in master by-addr tree */
280 struct rw_semaphore sem; /* access lock */
281
282 /* file service access */
283 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */
284 unsigned long fs_act_jif; /* time at which last activity occurred */
285 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
286 spinlock_t fs_lock; /* access lock */
287 int fs_state; /* 0 or reason FS currently marked dead (-errno) */
288
289 /* callback promise management */
290 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */
291 struct delayed_work cb_updater; /* callback updater */
292 struct delayed_work cb_break_work; /* collected break dispatcher */
293 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */
294 spinlock_t cb_lock; /* access lock */
295 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */
296 atomic_t cb_break_n; /* number of pending breaks */
297 u8 cb_break_head; /* head of callback breaking ring */
298 u8 cb_break_tail; /* tail of callback breaking ring */
299 };
300
301 /*
302 * AFS volume access record
303 */
304 struct afs_volume {
305 atomic_t usage;
306 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
307 struct afs_vlocation *vlocation; /* volume location */
308 #ifdef CONFIG_AFS_FSCACHE
309 struct fscache_cookie *cache; /* caching cookie */
310 #endif
311 afs_volid_t vid; /* volume ID */
312 afs_voltype_t type; /* type of volume */
313 char type_force; /* force volume type (suppress R/O -> R/W) */
314 unsigned short nservers; /* number of server slots filled */
315 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
316 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
317 struct rw_semaphore server_sem; /* lock for accessing current server */
318 struct backing_dev_info bdi;
319 };
320
321 /*
322 * vnode catalogue entry
323 */
324 struct afs_cache_vnode {
325 afs_vnodeid_t vnode_id; /* vnode ID */
326 unsigned vnode_unique; /* vnode ID uniquifier */
327 afs_dataversion_t data_version; /* data version */
328 };
329
330 /*
331 * AFS inode private data
332 */
333 struct afs_vnode {
334 struct inode vfs_inode; /* the VFS's inode record */
335
336 struct afs_volume *volume; /* volume on which vnode resides */
337 struct afs_server *server; /* server currently supplying this file */
338 struct afs_fid fid; /* the file identifier for this inode */
339 struct afs_file_status status; /* AFS status info for this file */
340 #ifdef CONFIG_AFS_FSCACHE
341 struct fscache_cookie *cache; /* caching cookie */
342 #endif
343 struct afs_permits *permits; /* cache of permits so far obtained */
344 struct mutex permits_lock; /* lock for altering permits list */
345 struct mutex validate_lock; /* lock for validating this vnode */
346 wait_queue_head_t update_waitq; /* status fetch waitqueue */
347 int update_cnt; /* number of outstanding ops that will update the
348 * status */
349 spinlock_t writeback_lock; /* lock for writebacks */
350 spinlock_t lock; /* waitqueue/flags lock */
351 unsigned long flags;
352 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
353 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
354 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */
355 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
356 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
357 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
358 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */
359 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */
360 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */
361 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */
362 #define AFS_VNODE_AUTOCELL 10 /* set if Vnode is an auto mount point */
363 #define AFS_VNODE_PSEUDODIR 11 /* set if Vnode is a pseudo directory */
364
365 long acl_order; /* ACL check count (callback break count) */
366
367 struct list_head writebacks; /* alterations in pagecache that need writing */
368 struct list_head pending_locks; /* locks waiting to be granted */
369 struct list_head granted_locks; /* locks granted on this file */
370 struct delayed_work lock_work; /* work to be done in locking */
371 struct key *unlock_key; /* key to be used in unlocking */
372
373 /* outstanding callback notification on this file */
374 struct rb_node server_rb; /* link in server->fs_vnodes */
375 struct rb_node cb_promise; /* link in server->cb_promises */
376 struct work_struct cb_broken_work; /* work to be done on callback break */
377 time_t cb_expires; /* time at which callback expires */
378 time_t cb_expires_at; /* time used to order cb_promise */
379 unsigned cb_version; /* callback version */
380 unsigned cb_expiry; /* callback expiry time */
381 afs_callback_type_t cb_type; /* type of callback */
382 bool cb_promised; /* true if promise still holds */
383 };
384
385 /*
386 * cached security record for one user's attempt to access a vnode
387 */
388 struct afs_permit {
389 struct key *key; /* RxRPC ticket holding a security context */
390 afs_access_t access_mask; /* access mask for this key */
391 };
392
393 /*
394 * cache of security records from attempts to access a vnode
395 */
396 struct afs_permits {
397 struct rcu_head rcu; /* disposal procedure */
398 int count; /* number of records */
399 struct afs_permit permits[0]; /* the permits so far examined */
400 };
401
402 /*
403 * record of one of a system's set of network interfaces
404 */
405 struct afs_interface {
406 struct in_addr address; /* IPv4 address bound to interface */
407 struct in_addr netmask; /* netmask applied to address */
408 unsigned mtu; /* MTU of interface */
409 };
410
411 /*
412 * UUID definition [internet draft]
413 * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
414 * increments since midnight 15th October 1582
415 * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
416 * time
417 * - the clock sequence is a 14-bit counter to avoid duplicate times
418 */
419 struct afs_uuid {
420 u32 time_low; /* low part of timestamp */
421 u16 time_mid; /* mid part of timestamp */
422 u16 time_hi_and_version; /* high part of timestamp and version */
423 #define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
424 #define AFS_UUID_TIMEHI_MASK 0x0fff
425 #define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */
426 #define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */
427 #define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
428 u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
429 #define AFS_UUID_CLOCKHI_MASK 0x3f
430 #define AFS_UUID_VARIANT_STD 0x80
431 u8 clock_seq_low; /* clock seq low */
432 u8 node[6]; /* spatially unique node ID (MAC addr) */
433 };
434
435 /*****************************************************************************/
436 /*
437 * cache.c
438 */
439 #ifdef CONFIG_AFS_FSCACHE
440 extern struct fscache_netfs afs_cache_netfs;
441 extern struct fscache_cookie_def afs_cell_cache_index_def;
442 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
443 extern struct fscache_cookie_def afs_volume_cache_index_def;
444 extern struct fscache_cookie_def afs_vnode_cache_index_def;
445 #else
446 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL)
447 #define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL)
448 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL)
449 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL)
450 #endif
451
452 /*
453 * callback.c
454 */
455 extern void afs_init_callback_state(struct afs_server *);
456 extern void afs_broken_callback_work(struct work_struct *);
457 extern void afs_break_callbacks(struct afs_server *, size_t,
458 struct afs_callback[]);
459 extern void afs_discard_callback_on_delete(struct afs_vnode *);
460 extern void afs_give_up_callback(struct afs_vnode *);
461 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
462 extern void afs_flush_callback_breaks(struct afs_server *);
463 extern int __init afs_callback_update_init(void);
464 extern void afs_callback_update_kill(void);
465
466 /*
467 * cell.c
468 */
469 extern struct rw_semaphore afs_proc_cells_sem;
470 extern struct list_head afs_proc_cells;
471
472 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
473 extern int afs_cell_init(char *);
474 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool);
475 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool);
476 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
477 extern void afs_put_cell(struct afs_cell *);
478 extern void afs_cell_purge(void);
479
480 /*
481 * cmservice.c
482 */
483 extern bool afs_cm_incoming_call(struct afs_call *);
484
485 /*
486 * dir.c
487 */
488 extern const struct inode_operations afs_dir_inode_operations;
489 extern const struct file_operations afs_dir_file_operations;
490
491 /*
492 * file.c
493 */
494 extern const struct address_space_operations afs_fs_aops;
495 extern const struct inode_operations afs_file_inode_operations;
496 extern const struct file_operations afs_file_operations;
497
498 extern int afs_open(struct inode *, struct file *);
499 extern int afs_release(struct inode *, struct file *);
500 extern int afs_page_filler(void *, struct page *);
501
502 /*
503 * flock.c
504 */
505 extern void __exit afs_kill_lock_manager(void);
506 extern void afs_lock_work(struct work_struct *);
507 extern void afs_lock_may_be_available(struct afs_vnode *);
508 extern int afs_lock(struct file *, int, struct file_lock *);
509 extern int afs_flock(struct file *, int, struct file_lock *);
510
511 /*
512 * fsclient.c
513 */
514 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
515 struct afs_vnode *, struct afs_volsync *,
516 const struct afs_wait_mode *);
517 extern int afs_fs_give_up_callbacks(struct afs_server *,
518 const struct afs_wait_mode *);
519 extern 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 *);
522 extern 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 *);
527 extern int afs_fs_remove(struct afs_server *, struct key *,
528 struct afs_vnode *, const char *, bool,
529 const struct afs_wait_mode *);
530 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
531 struct afs_vnode *, const char *,
532 const struct afs_wait_mode *);
533 extern 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 *);
537 extern 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 *);
541 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
542 pgoff_t, pgoff_t, unsigned, unsigned,
543 const struct afs_wait_mode *);
544 extern int afs_fs_setattr(struct afs_server *, struct key *,
545 struct afs_vnode *, struct iattr *,
546 const struct afs_wait_mode *);
547 extern 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 *);
551 extern int afs_fs_set_lock(struct afs_server *, struct key *,
552 struct afs_vnode *, afs_lock_type_t,
553 const struct afs_wait_mode *);
554 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
555 struct afs_vnode *,
556 const struct afs_wait_mode *);
557 extern 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 */
564 extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
565 struct key *);
566 extern struct inode *afs_iget(struct super_block *, struct key *,
567 struct afs_fid *, struct afs_file_status *,
568 struct afs_callback *);
569 extern void afs_zap_data(struct afs_vnode *);
570 extern int afs_validate(struct afs_vnode *, struct key *);
571 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
572 extern int afs_setattr(struct dentry *, struct iattr *);
573 extern void afs_evict_inode(struct inode *);
574 extern int afs_drop_inode(struct inode *);
575
576 /*
577 * main.c
578 */
579 extern struct afs_uuid afs_uuid;
580
581 /*
582 * misc.c
583 */
584 extern int afs_abort_to_error(u32);
585
586 /*
587 * mntpt.c
588 */
589 extern const struct inode_operations afs_mntpt_inode_operations;
590 extern const struct inode_operations afs_autocell_inode_operations;
591 extern const struct file_operations afs_mntpt_file_operations;
592
593 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
594 extern void afs_mntpt_kill_timer(void);
595
596 /*
597 * proc.c
598 */
599 extern int afs_proc_init(void);
600 extern void afs_proc_cleanup(void);
601 extern int afs_proc_cell_setup(struct afs_cell *);
602 extern void afs_proc_cell_remove(struct afs_cell *);
603
604 /*
605 * rxrpc.c
606 */
607 extern int afs_open_socket(void);
608 extern void afs_close_socket(void);
609 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
610 const struct afs_wait_mode *);
611 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
612 size_t, size_t);
613 extern void afs_flat_call_destructor(struct afs_call *);
614 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
615 extern void afs_send_empty_reply(struct afs_call *);
616 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
617 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
618 size_t);
619
620 /*
621 * security.c
622 */
623 extern void afs_clear_permits(struct afs_vnode *);
624 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
625 extern void afs_zap_permits(struct rcu_head *);
626 extern struct key *afs_request_key(struct afs_cell *);
627 extern int afs_permission(struct inode *, int);
628
629 /*
630 * server.c
631 */
632 extern spinlock_t afs_server_peer_lock;
633
634 #define afs_get_server(S) \
635 do { \
636 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \
637 atomic_inc(&(S)->usage); \
638 } while(0)
639
640 extern struct afs_server *afs_lookup_server(struct afs_cell *,
641 const struct in_addr *);
642 extern struct afs_server *afs_find_server(const struct in_addr *);
643 extern void afs_put_server(struct afs_server *);
644 extern void __exit afs_purge_servers(void);
645
646 /*
647 * super.c
648 */
649 extern int afs_fs_init(void);
650 extern void afs_fs_exit(void);
651
652 /*
653 * use-rtnetlink.c
654 */
655 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
656 extern int afs_get_MAC_address(u8 *, size_t);
657
658 /*
659 * vlclient.c
660 */
661 extern 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 *);
664 extern 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
674 extern int __init afs_vlocation_update_init(void);
675 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
676 struct key *,
677 const char *, size_t);
678 extern void afs_put_vlocation(struct afs_vlocation *);
679 extern void afs_vlocation_purge(void);
680
681 /*
682 * vnode.c
683 */
684 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
685 {
686 return container_of(inode, struct afs_vnode, vfs_inode);
687 }
688
689 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
690 {
691 return &vnode->vfs_inode;
692 }
693
694 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
695 struct afs_server *);
696 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
697 struct key *);
698 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
699 off_t, size_t, struct page *);
700 extern 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 **);
703 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
704 bool);
705 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
706 const char *);
707 extern 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 **);
710 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
711 struct key *, const char *, const char *);
712 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
713 unsigned, unsigned);
714 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
715 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
716 struct afs_volume_status *);
717 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
718 afs_lock_type_t);
719 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
720 extern 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
727 extern void afs_put_volume(struct afs_volume *);
728 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
729 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
730 extern int afs_volume_release_fileserver(struct afs_vnode *,
731 struct afs_server *, int);
732
733 /*
734 * write.c
735 */
736 extern int afs_set_page_dirty(struct page *);
737 extern void afs_put_writeback(struct afs_writeback *);
738 extern 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);
741 extern 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);
744 extern int afs_writepage(struct page *, struct writeback_control *);
745 extern int afs_writepages(struct address_space *, struct writeback_control *);
746 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
747 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
748 unsigned long, loff_t);
749 extern int afs_writeback_all(struct afs_vnode *);
750 extern int afs_fsync(struct file *, int);
751
752
753 /*****************************************************************************/
754 /*
755 * debug tracing
756 */
757 extern 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,...) \
778 do { \
779 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
780 kenter(FMT,##__VA_ARGS__); \
781 } while (0)
782
783 #define _leave(FMT,...) \
784 do { \
785 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
786 kleave(FMT,##__VA_ARGS__); \
787 } while (0)
788
789 #define _debug(FMT,...) \
790 do { \
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) \
806 do { \
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) \
815 do { \
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) \
828 do { \
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) \
843 do { \
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) \
852 do { \
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)
Tomato firmware and modifications.