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drm/i915: Only destroy a constructed mmap offset
[linux-2.6/linux-2.6-openrd.git] / fs / afs / internal.h
blob106be66dafd2ca7edc9388dac55d8a218ab52dc6
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
22 #include "afs.h"
23 #include "afs_vl.h"
24 #include "cache.h"
25
26 #define AFS_CELL_MAX_ADDRS 15
27
28 struct pagevec;
29 struct afs_call;
30
31 typedef enum {
32 AFS_VL_NEW, /* new, uninitialised record */
33 AFS_VL_CREATING, /* creating record */
34 AFS_VL_VALID, /* record is pending */
35 AFS_VL_NO_VOLUME, /* no such volume available */
36 AFS_VL_UPDATING, /* update in progress */
37 AFS_VL_VOLUME_DELETED, /* volume was deleted */
38 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */
39 } __attribute__((packed)) afs_vlocation_state_t;
40
41 struct afs_mount_params {
42 bool rwpath; /* T if the parent should be considered R/W */
43 bool force; /* T to force cell type */
44 afs_voltype_t type; /* type of volume requested */
45 int volnamesz; /* size of volume name */
46 const char *volname; /* name of volume to mount */
47 struct afs_cell *cell; /* cell in which to find volume */
48 struct afs_volume *volume; /* volume record */
49 struct key *key; /* key to use for secure mounting */
50 };
51
52 /*
53 * definition of how to wait for the completion of an operation
54 */
55 struct afs_wait_mode {
56 /* RxRPC received message notification */
57 void (*rx_wakeup)(struct afs_call *call);
58
59 /* synchronous call waiter and call dispatched notification */
60 int (*wait)(struct afs_call *call);
61
62 /* asynchronous call completion */
63 void (*async_complete)(void *reply, int error);
64 };
65
66 extern const struct afs_wait_mode afs_sync_call;
67 extern const struct afs_wait_mode afs_async_call;
68
69 /*
70 * a record of an in-progress RxRPC call
71 */
72 struct afs_call {
73 const struct afs_call_type *type; /* type of call */
74 const struct afs_wait_mode *wait_mode; /* completion wait mode */
75 wait_queue_head_t waitq; /* processes awaiting completion */
76 struct work_struct async_work; /* asynchronous work processor */
77 struct work_struct work; /* actual work processor */
78 struct sk_buff_head rx_queue; /* received packets */
79 struct rxrpc_call *rxcall; /* RxRPC call handle */
80 struct key *key; /* security for this call */
81 struct afs_server *server; /* server affected by incoming CM call */
82 void *request; /* request data (first part) */
83 struct address_space *mapping; /* page set */
84 struct afs_writeback *wb; /* writeback being performed */
85 void *buffer; /* reply receive buffer */
86 void *reply; /* reply buffer (first part) */
87 void *reply2; /* reply buffer (second part) */
88 void *reply3; /* reply buffer (third part) */
89 void *reply4; /* reply buffer (fourth part) */
90 pgoff_t first; /* first page in mapping to deal with */
91 pgoff_t last; /* last page in mapping to deal with */
92 enum { /* call state */
93 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
94 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
95 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */
96 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
97 AFS_CALL_REPLYING, /* replying to incoming call */
98 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */
99 AFS_CALL_COMPLETE, /* successfully completed */
100 AFS_CALL_BUSY, /* server was busy */
101 AFS_CALL_ABORTED, /* call was aborted */
102 AFS_CALL_ERROR, /* call failed due to error */
103 } state;
104 int error; /* error code */
105 unsigned request_size; /* size of request data */
106 unsigned reply_max; /* maximum size of reply */
107 unsigned reply_size; /* current size of reply */
108 unsigned first_offset; /* offset into mapping[first] */
109 unsigned last_to; /* amount of mapping[last] */
110 unsigned short offset; /* offset into received data store */
111 unsigned char unmarshall; /* unmarshalling phase */
112 bool incoming; /* T if incoming call */
113 bool send_pages; /* T if data from mapping should be sent */
114 u16 service_id; /* RxRPC service ID to call */
115 __be16 port; /* target UDP port */
116 __be32 operation_ID; /* operation ID for an incoming call */
117 u32 count; /* count for use in unmarshalling */
118 __be32 tmp; /* place to extract temporary data */
119 afs_dataversion_t store_version; /* updated version expected from store */
120 };
121
122 struct afs_call_type {
123 const char *name;
124
125 /* deliver request or reply data to an call
126 * - returning an error will cause the call to be aborted
127 */
128 int (*deliver)(struct afs_call *call, struct sk_buff *skb,
129 bool last);
130
131 /* map an abort code to an error number */
132 int (*abort_to_error)(u32 abort_code);
133
134 /* clean up a call */
135 void (*destructor)(struct afs_call *call);
136 };
137
138 /*
139 * record of an outstanding writeback on a vnode
140 */
141 struct afs_writeback {
142 struct list_head link; /* link in vnode->writebacks */
143 struct work_struct writer; /* work item to perform the writeback */
144 struct afs_vnode *vnode; /* vnode to which this write applies */
145 struct key *key; /* owner of this write */
146 wait_queue_head_t waitq; /* completion and ready wait queue */
147 pgoff_t first; /* first page in batch */
148 pgoff_t point; /* last page in current store op */
149 pgoff_t last; /* last page in batch (inclusive) */
150 unsigned offset_first; /* offset into first page of start of write */
151 unsigned to_last; /* offset into last page of end of write */
152 int num_conflicts; /* count of conflicting writes in list */
153 int usage;
154 bool conflicts; /* T if has dependent conflicts */
155 enum {
156 AFS_WBACK_SYNCING, /* synchronisation being performed */
157 AFS_WBACK_PENDING, /* write pending */
158 AFS_WBACK_CONFLICTING, /* conflicting writes posted */
159 AFS_WBACK_WRITING, /* writing back */
160 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */
161 } state __attribute__((packed));
162 };
163
164 /*
165 * AFS superblock private data
166 * - there's one superblock per volume
167 */
168 struct afs_super_info {
169 struct afs_volume *volume; /* volume record */
170 char rwparent; /* T if parent is R/W AFS volume */
171 };
172
173 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
174 {
175 return sb->s_fs_info;
176 }
177
178 extern struct file_system_type afs_fs_type;
179
180 /*
181 * entry in the cached cell catalogue
182 */
183 struct afs_cache_cell {
184 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */
185 struct in_addr vl_servers[15]; /* cached cell VL servers */
186 };
187
188 /*
189 * AFS cell record
190 */
191 struct afs_cell {
192 atomic_t usage;
193 struct list_head link; /* main cell list link */
194 struct key *anonymous_key; /* anonymous user key for this cell */
195 struct list_head proc_link; /* /proc cell list link */
196 struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
197 #ifdef CONFIG_AFS_FSCACHE
198 struct fscache_cookie *cache; /* caching cookie */
199 #endif
200
201 /* server record management */
202 rwlock_t servers_lock; /* active server list lock */
203 struct list_head servers; /* active server list */
204
205 /* volume location record management */
206 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */
207 struct list_head vl_list; /* cell's active VL record list */
208 spinlock_t vl_lock; /* vl_list lock */
209 unsigned short vl_naddrs; /* number of VL servers in addr list */
210 unsigned short vl_curr_svix; /* current server index */
211 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */
212
213 char name[0]; /* cell name - must go last */
214 };
215
216 /*
217 * entry in the cached volume location catalogue
218 */
219 struct afs_cache_vlocation {
220 /* volume name (lowercase, padded with NULs) */
221 uint8_t name[AFS_MAXVOLNAME + 1];
222
223 uint8_t nservers; /* number of entries used in servers[] */
224 uint8_t vidmask; /* voltype mask for vid[] */
225 uint8_t srvtmask[8]; /* voltype masks for servers[] */
226 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
227 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
228 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
229
230 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
231 struct in_addr servers[8]; /* fileserver addresses */
232 time_t rtime; /* last retrieval time */
233 };
234
235 /*
236 * volume -> vnode hash table entry
237 */
238 struct afs_cache_vhash {
239 afs_voltype_t vtype; /* which volume variation */
240 uint8_t hash_bucket; /* which hash bucket this represents */
241 } __attribute__((packed));
242
243 /*
244 * AFS volume location record
245 */
246 struct afs_vlocation {
247 atomic_t usage;
248 time_t time_of_death; /* time at which put reduced usage to 0 */
249 struct list_head link; /* link in cell volume location list */
250 struct list_head grave; /* link in master graveyard list */
251 struct list_head update; /* link in master update list */
252 struct afs_cell *cell; /* cell to which volume belongs */
253 #ifdef CONFIG_AFS_FSCACHE
254 struct fscache_cookie *cache; /* caching cookie */
255 #endif
256 struct afs_cache_vlocation vldb; /* volume information DB record */
257 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
258 wait_queue_head_t waitq; /* status change waitqueue */
259 time_t update_at; /* time at which record should be updated */
260 spinlock_t lock; /* access lock */
261 afs_vlocation_state_t state; /* volume location state */
262 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
263 unsigned short upd_busy_cnt; /* EBUSY count during update */
264 bool valid; /* T if valid */
265 };
266
267 /*
268 * AFS fileserver record
269 */
270 struct afs_server {
271 atomic_t usage;
272 time_t time_of_death; /* time at which put reduced usage to 0 */
273 struct in_addr addr; /* server address */
274 struct afs_cell *cell; /* cell in which server resides */
275 struct list_head link; /* link in cell's server list */
276 struct list_head grave; /* link in master graveyard list */
277 struct rb_node master_rb; /* link in master by-addr tree */
278 struct rw_semaphore sem; /* access lock */
279
280 /* file service access */
281 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */
282 unsigned long fs_act_jif; /* time at which last activity occurred */
283 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
284 spinlock_t fs_lock; /* access lock */
285 int fs_state; /* 0 or reason FS currently marked dead (-errno) */
286
287 /* callback promise management */
288 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */
289 struct delayed_work cb_updater; /* callback updater */
290 struct delayed_work cb_break_work; /* collected break dispatcher */
291 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */
292 spinlock_t cb_lock; /* access lock */
293 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */
294 atomic_t cb_break_n; /* number of pending breaks */
295 u8 cb_break_head; /* head of callback breaking ring */
296 u8 cb_break_tail; /* tail of callback breaking ring */
297 };
298
299 /*
300 * AFS volume access record
301 */
302 struct afs_volume {
303 atomic_t usage;
304 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
305 struct afs_vlocation *vlocation; /* volume location */
306 #ifdef CONFIG_AFS_FSCACHE
307 struct fscache_cookie *cache; /* caching cookie */
308 #endif
309 afs_volid_t vid; /* volume ID */
310 afs_voltype_t type; /* type of volume */
311 char type_force; /* force volume type (suppress R/O -> R/W) */
312 unsigned short nservers; /* number of server slots filled */
313 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
314 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
315 struct rw_semaphore server_sem; /* lock for accessing current server */
316 };
317
318 /*
319 * vnode catalogue entry
320 */
321 struct afs_cache_vnode {
322 afs_vnodeid_t vnode_id; /* vnode ID */
323 unsigned vnode_unique; /* vnode ID uniquifier */
324 afs_dataversion_t data_version; /* data version */
325 };
326
327 /*
328 * AFS inode private data
329 */
330 struct afs_vnode {
331 struct inode vfs_inode; /* the VFS's inode record */
332
333 struct afs_volume *volume; /* volume on which vnode resides */
334 struct afs_server *server; /* server currently supplying this file */
335 struct afs_fid fid; /* the file identifier for this inode */
336 struct afs_file_status status; /* AFS status info for this file */
337 #ifdef CONFIG_AFS_FSCACHE
338 struct fscache_cookie *cache; /* caching cookie */
339 #endif
340 struct afs_permits *permits; /* cache of permits so far obtained */
341 struct mutex permits_lock; /* lock for altering permits list */
342 struct mutex validate_lock; /* lock for validating this vnode */
343 wait_queue_head_t update_waitq; /* status fetch waitqueue */
344 int update_cnt; /* number of outstanding ops that will update the
345 * status */
346 spinlock_t writeback_lock; /* lock for writebacks */
347 spinlock_t lock; /* waitqueue/flags lock */
348 unsigned long flags;
349 #define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
350 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
351 #define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */
352 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
353 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
354 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
355 #define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */
356 #define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */
357 #define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */
358 #define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */
359
360 long acl_order; /* ACL check count (callback break count) */
361
362 struct list_head writebacks; /* alterations in pagecache that need writing */
363 struct list_head pending_locks; /* locks waiting to be granted */
364 struct list_head granted_locks; /* locks granted on this file */
365 struct delayed_work lock_work; /* work to be done in locking */
366 struct key *unlock_key; /* key to be used in unlocking */
367
368 /* outstanding callback notification on this file */
369 struct rb_node server_rb; /* link in server->fs_vnodes */
370 struct rb_node cb_promise; /* link in server->cb_promises */
371 struct work_struct cb_broken_work; /* work to be done on callback break */
372 time_t cb_expires; /* time at which callback expires */
373 time_t cb_expires_at; /* time used to order cb_promise */
374 unsigned cb_version; /* callback version */
375 unsigned cb_expiry; /* callback expiry time */
376 afs_callback_type_t cb_type; /* type of callback */
377 bool cb_promised; /* true if promise still holds */
378 };
379
380 /*
381 * cached security record for one user's attempt to access a vnode
382 */
383 struct afs_permit {
384 struct key *key; /* RxRPC ticket holding a security context */
385 afs_access_t access_mask; /* access mask for this key */
386 };
387
388 /*
389 * cache of security records from attempts to access a vnode
390 */
391 struct afs_permits {
392 struct rcu_head rcu; /* disposal procedure */
393 int count; /* number of records */
394 struct afs_permit permits[0]; /* the permits so far examined */
395 };
396
397 /*
398 * record of one of a system's set of network interfaces
399 */
400 struct afs_interface {
401 struct in_addr address; /* IPv4 address bound to interface */
402 struct in_addr netmask; /* netmask applied to address */
403 unsigned mtu; /* MTU of interface */
404 };
405
406 /*
407 * UUID definition [internet draft]
408 * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
409 * increments since midnight 15th October 1582
410 * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
411 * time
412 * - the clock sequence is a 14-bit counter to avoid duplicate times
413 */
414 struct afs_uuid {
415 u32 time_low; /* low part of timestamp */
416 u16 time_mid; /* mid part of timestamp */
417 u16 time_hi_and_version; /* high part of timestamp and version */
418 #define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
419 #define AFS_UUID_TIMEHI_MASK 0x0fff
420 #define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */
421 #define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */
422 #define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
423 u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
424 #define AFS_UUID_CLOCKHI_MASK 0x3f
425 #define AFS_UUID_VARIANT_STD 0x80
426 u8 clock_seq_low; /* clock seq low */
427 u8 node[6]; /* spatially unique node ID (MAC addr) */
428 };
429
430 /*****************************************************************************/
431 /*
432 * cache.c
433 */
434 #ifdef CONFIG_AFS_FSCACHE
435 extern struct fscache_netfs afs_cache_netfs;
436 extern struct fscache_cookie_def afs_cell_cache_index_def;
437 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
438 extern struct fscache_cookie_def afs_volume_cache_index_def;
439 extern struct fscache_cookie_def afs_vnode_cache_index_def;
440 #else
441 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL)
442 #define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL)
443 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL)
444 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL)
445 #endif
446
447 /*
448 * callback.c
449 */
450 extern void afs_init_callback_state(struct afs_server *);
451 extern void afs_broken_callback_work(struct work_struct *);
452 extern void afs_break_callbacks(struct afs_server *, size_t,
453 struct afs_callback[]);
454 extern void afs_discard_callback_on_delete(struct afs_vnode *);
455 extern void afs_give_up_callback(struct afs_vnode *);
456 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
457 extern void afs_flush_callback_breaks(struct afs_server *);
458 extern int __init afs_callback_update_init(void);
459 extern void afs_callback_update_kill(void);
460
461 /*
462 * cell.c
463 */
464 extern struct rw_semaphore afs_proc_cells_sem;
465 extern struct list_head afs_proc_cells;
466
467 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
468 extern int afs_cell_init(char *);
469 extern struct afs_cell *afs_cell_create(const char *, char *);
470 extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
471 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
472 extern void afs_put_cell(struct afs_cell *);
473 extern void afs_cell_purge(void);
474
475 /*
476 * cmservice.c
477 */
478 extern bool afs_cm_incoming_call(struct afs_call *);
479
480 /*
481 * dir.c
482 */
483 extern const struct inode_operations afs_dir_inode_operations;
484 extern const struct file_operations afs_dir_file_operations;
485
486 /*
487 * file.c
488 */
489 extern const struct address_space_operations afs_fs_aops;
490 extern const struct inode_operations afs_file_inode_operations;
491 extern const struct file_operations afs_file_operations;
492
493 extern int afs_open(struct inode *, struct file *);
494 extern int afs_release(struct inode *, struct file *);
495
496 /*
497 * flock.c
498 */
499 extern void __exit afs_kill_lock_manager(void);
500 extern void afs_lock_work(struct work_struct *);
501 extern void afs_lock_may_be_available(struct afs_vnode *);
502 extern int afs_lock(struct file *, int, struct file_lock *);
503 extern int afs_flock(struct file *, int, struct file_lock *);
504
505 /*
506 * fsclient.c
507 */
508 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
509 struct afs_vnode *, struct afs_volsync *,
510 const struct afs_wait_mode *);
511 extern int afs_fs_give_up_callbacks(struct afs_server *,
512 const struct afs_wait_mode *);
513 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
514 struct afs_vnode *, off_t, size_t, struct page *,
515 const struct afs_wait_mode *);
516 extern int afs_fs_create(struct afs_server *, struct key *,
517 struct afs_vnode *, const char *, umode_t,
518 struct afs_fid *, struct afs_file_status *,
519 struct afs_callback *,
520 const struct afs_wait_mode *);
521 extern int afs_fs_remove(struct afs_server *, struct key *,
522 struct afs_vnode *, const char *, bool,
523 const struct afs_wait_mode *);
524 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
525 struct afs_vnode *, const char *,
526 const struct afs_wait_mode *);
527 extern int afs_fs_symlink(struct afs_server *, struct key *,
528 struct afs_vnode *, const char *, const char *,
529 struct afs_fid *, struct afs_file_status *,
530 const struct afs_wait_mode *);
531 extern int afs_fs_rename(struct afs_server *, struct key *,
532 struct afs_vnode *, const char *,
533 struct afs_vnode *, const char *,
534 const struct afs_wait_mode *);
535 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
536 pgoff_t, pgoff_t, unsigned, unsigned,
537 const struct afs_wait_mode *);
538 extern int afs_fs_setattr(struct afs_server *, struct key *,
539 struct afs_vnode *, struct iattr *,
540 const struct afs_wait_mode *);
541 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
542 struct afs_vnode *,
543 struct afs_volume_status *,
544 const struct afs_wait_mode *);
545 extern int afs_fs_set_lock(struct afs_server *, struct key *,
546 struct afs_vnode *, afs_lock_type_t,
547 const struct afs_wait_mode *);
548 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
549 struct afs_vnode *,
550 const struct afs_wait_mode *);
551 extern int afs_fs_release_lock(struct afs_server *, struct key *,
552 struct afs_vnode *,
553 const struct afs_wait_mode *);
554
555 /*
556 * inode.c
557 */
558 extern struct inode *afs_iget(struct super_block *, struct key *,
559 struct afs_fid *, struct afs_file_status *,
560 struct afs_callback *);
561 extern void afs_zap_data(struct afs_vnode *);
562 extern int afs_validate(struct afs_vnode *, struct key *);
563 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
564 extern int afs_setattr(struct dentry *, struct iattr *);
565 extern void afs_clear_inode(struct inode *);
566
567 /*
568 * main.c
569 */
570 extern struct afs_uuid afs_uuid;
571
572 /*
573 * misc.c
574 */
575 extern int afs_abort_to_error(u32);
576
577 /*
578 * mntpt.c
579 */
580 extern const struct inode_operations afs_mntpt_inode_operations;
581 extern const struct file_operations afs_mntpt_file_operations;
582
583 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
584 extern void afs_mntpt_kill_timer(void);
585
586 /*
587 * proc.c
588 */
589 extern int afs_proc_init(void);
590 extern void afs_proc_cleanup(void);
591 extern int afs_proc_cell_setup(struct afs_cell *);
592 extern void afs_proc_cell_remove(struct afs_cell *);
593
594 /*
595 * rxrpc.c
596 */
597 extern int afs_open_socket(void);
598 extern void afs_close_socket(void);
599 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
600 const struct afs_wait_mode *);
601 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
602 size_t, size_t);
603 extern void afs_flat_call_destructor(struct afs_call *);
604 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
605 extern void afs_send_empty_reply(struct afs_call *);
606 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
607 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
608 size_t);
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 in_addr *);
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 * use-rtnetlink.c
644 */
645 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
646 extern int afs_get_MAC_address(u8 *, size_t);
647
648 /*
649 * vlclient.c
650 */
651 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
652 const char *, struct afs_cache_vlocation *,
653 const struct afs_wait_mode *);
654 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
655 afs_volid_t, afs_voltype_t,
656 struct afs_cache_vlocation *,
657 const struct afs_wait_mode *);
658
659 /*
660 * vlocation.c
661 */
662 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
663
664 extern int __init afs_vlocation_update_init(void);
665 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
666 struct key *,
667 const char *, size_t);
668 extern void afs_put_vlocation(struct afs_vlocation *);
669 extern void afs_vlocation_purge(void);
670
671 /*
672 * vnode.c
673 */
674 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
675 {
676 return container_of(inode, struct afs_vnode, vfs_inode);
677 }
678
679 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
680 {
681 return &vnode->vfs_inode;
682 }
683
684 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
685 struct afs_server *);
686 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
687 struct key *);
688 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
689 off_t, size_t, struct page *);
690 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
691 umode_t, struct afs_fid *, struct afs_file_status *,
692 struct afs_callback *, struct afs_server **);
693 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
694 bool);
695 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
696 const char *);
697 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
698 const char *, struct afs_fid *,
699 struct afs_file_status *, struct afs_server **);
700 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
701 struct key *, const char *, const char *);
702 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
703 unsigned, unsigned);
704 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
705 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
706 struct afs_volume_status *);
707 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
708 afs_lock_type_t);
709 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
710 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
711
712 /*
713 * volume.c
714 */
715 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
716
717 extern void afs_put_volume(struct afs_volume *);
718 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
719 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
720 extern int afs_volume_release_fileserver(struct afs_vnode *,
721 struct afs_server *, int);
722
723 /*
724 * write.c
725 */
726 extern int afs_set_page_dirty(struct page *);
727 extern void afs_put_writeback(struct afs_writeback *);
728 extern int afs_write_begin(struct file *file, struct address_space *mapping,
729 loff_t pos, unsigned len, unsigned flags,
730 struct page **pagep, void **fsdata);
731 extern int afs_write_end(struct file *file, struct address_space *mapping,
732 loff_t pos, unsigned len, unsigned copied,
733 struct page *page, void *fsdata);
734 extern int afs_writepage(struct page *, struct writeback_control *);
735 extern int afs_writepages(struct address_space *, struct writeback_control *);
736 extern int afs_write_inode(struct inode *, int);
737 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
738 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
739 unsigned long, loff_t);
740 extern int afs_writeback_all(struct afs_vnode *);
741 extern int afs_fsync(struct file *, struct dentry *, int);
742
743
744 /*****************************************************************************/
745 /*
746 * debug tracing
747 */
748 extern unsigned afs_debug;
749
750 #define dbgprintk(FMT,...) \
751 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
752
753 /* make sure we maintain the format strings, even when debugging is disabled */
754 static inline __attribute__((format(printf,1,2)))
755 void _dbprintk(const char *fmt, ...)
756 {
757 }
758
759 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
760 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
761 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
762
763
764 #if defined(__KDEBUG)
765 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
766 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
767 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
768
769 #elif defined(CONFIG_AFS_DEBUG)
770 #define AFS_DEBUG_KENTER 0x01
771 #define AFS_DEBUG_KLEAVE 0x02
772 #define AFS_DEBUG_KDEBUG 0x04
773
774 #define _enter(FMT,...) \
775 do { \
776 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
777 kenter(FMT,##__VA_ARGS__); \
778 } while (0)
779
780 #define _leave(FMT,...) \
781 do { \
782 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
783 kleave(FMT,##__VA_ARGS__); \
784 } while (0)
785
786 #define _debug(FMT,...) \
787 do { \
788 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
789 kdebug(FMT,##__VA_ARGS__); \
790 } while (0)
791
792 #else
793 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
794 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
795 #define _debug(FMT,...) _dbprintk(" "FMT ,##__VA_ARGS__)
796 #endif
797
798 /*
799 * debug assertion checking
800 */
801 #if 1 // defined(__KDEBUGALL)
802
803 #define ASSERT(X) \
804 do { \
805 if (unlikely(!(X))) { \
806 printk(KERN_ERR "\n"); \
807 printk(KERN_ERR "AFS: Assertion failed\n"); \
808 BUG(); \
809 } \
810 } while(0)
811
812 #define ASSERTCMP(X, OP, Y) \
813 do { \
814 if (unlikely(!((X) OP (Y)))) { \
815 printk(KERN_ERR "\n"); \
816 printk(KERN_ERR "AFS: Assertion failed\n"); \
817 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
818 (unsigned long)(X), (unsigned long)(Y)); \
819 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
820 (unsigned long)(X), (unsigned long)(Y)); \
821 BUG(); \
822 } \
823 } while(0)
824
825 #define ASSERTRANGE(L, OP1, N, OP2, H) \
826 do { \
827 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
828 printk(KERN_ERR "\n"); \
829 printk(KERN_ERR "AFS: Assertion failed\n"); \
830 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
831 (unsigned long)(L), (unsigned long)(N), \
832 (unsigned long)(H)); \
833 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
834 (unsigned long)(L), (unsigned long)(N), \
835 (unsigned long)(H)); \
836 BUG(); \
837 } \
838 } while(0)
839
840 #define ASSERTIF(C, X) \
841 do { \
842 if (unlikely((C) && !(X))) { \
843 printk(KERN_ERR "\n"); \
844 printk(KERN_ERR "AFS: Assertion failed\n"); \
845 BUG(); \
846 } \
847 } while(0)
848
849 #define ASSERTIFCMP(C, X, OP, Y) \
850 do { \
851 if (unlikely((C) && !((X) OP (Y)))) { \
852 printk(KERN_ERR "\n"); \
853 printk(KERN_ERR "AFS: Assertion failed\n"); \
854 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
855 (unsigned long)(X), (unsigned long)(Y)); \
856 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
857 (unsigned long)(X), (unsigned long)(Y)); \
858 BUG(); \
859 } \
860 } while(0)
861
862 #else
863
864 #define ASSERT(X) \
865 do { \
866 } while(0)
867
868 #define ASSERTCMP(X, OP, Y) \
869 do { \
870 } while(0)
871
872 #define ASSERTRANGE(L, OP1, N, OP2, H) \
873 do { \
874 } while(0)
875
876 #define ASSERTIF(C, X) \
877 do { \
878 } while(0)
879
880 #define ASSERTIFCMP(C, X, OP, Y) \
881 do { \
882 } while(0)
883
884 #endif /* __KDEBUGALL */
linux 2.6 git repository for openrd