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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 | |
23 | #include "afs.h" |
24 | #include "afs_vl.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 void afs_pages_written_back(struct afs_vnode *, struct afs_call *); |
737 | extern ssize_t afs_file_write(struct kiocb *, const struct iovec *, |
738 | unsigned long, loff_t); |
739 | extern int afs_writeback_all(struct afs_vnode *); |
740 | extern int afs_fsync(struct file *, struct dentry *, int); |
741 | |
742 | |
743 | /*****************************************************************************/ |
744 | /* |
745 | * debug tracing |
746 | */ |
747 | extern unsigned afs_debug; |
748 | |
749 | #define dbgprintk(FMT,...) \ |
750 | printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) |
751 | |
752 | /* make sure we maintain the format strings, even when debugging is disabled */ |
753 | static inline __attribute__((format(printf,1,2))) |
754 | void _dbprintk(const char *fmt, ...) |
755 | { |
756 | } |
757 | |
758 | #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) |
759 | #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) |
760 | #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) |
761 | |
762 | |
763 | #if defined(__KDEBUG) |
764 | #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) |
765 | #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) |
766 | #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) |
767 | |
768 | #elif defined(CONFIG_AFS_DEBUG) |
769 | #define AFS_DEBUG_KENTER 0x01 |
770 | #define AFS_DEBUG_KLEAVE 0x02 |
771 | #define AFS_DEBUG_KDEBUG 0x04 |
772 | |
773 | #define _enter(FMT,...) \ |
774 | do { \ |
775 | if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \ |
776 | kenter(FMT,##__VA_ARGS__); \ |
777 | } while (0) |
778 | |
779 | #define _leave(FMT,...) \ |
780 | do { \ |
781 | if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \ |
782 | kleave(FMT,##__VA_ARGS__); \ |
783 | } while (0) |
784 | |
785 | #define _debug(FMT,...) \ |
786 | do { \ |
787 | if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \ |
788 | kdebug(FMT,##__VA_ARGS__); \ |
789 | } while (0) |
790 | |
791 | #else |
792 | #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) |
793 | #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) |
794 | #define _debug(FMT,...) _dbprintk(" "FMT ,##__VA_ARGS__) |
795 | #endif |
796 | |
797 | /* |
798 | * debug assertion checking |
799 | */ |
800 | #if 1 // defined(__KDEBUGALL) |
801 | |
802 | #define ASSERT(X) \ |
803 | do { \ |
804 | if (unlikely(!(X))) { \ |
805 | printk(KERN_ERR "\n"); \ |
806 | printk(KERN_ERR "AFS: Assertion failed\n"); \ |
807 | BUG(); \ |
808 | } \ |
809 | } while(0) |
810 | |
811 | #define ASSERTCMP(X, OP, Y) \ |
812 | do { \ |
813 | if (unlikely(!((X) OP (Y)))) { \ |
814 | printk(KERN_ERR "\n"); \ |
815 | printk(KERN_ERR "AFS: Assertion failed\n"); \ |
816 | printk(KERN_ERR "%lu " #OP " %lu is false\n", \ |
817 | (unsigned long)(X), (unsigned long)(Y)); \ |
818 | printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ |
819 | (unsigned long)(X), (unsigned long)(Y)); \ |
820 | BUG(); \ |
821 | } \ |
822 | } while(0) |
823 | |
824 | #define ASSERTRANGE(L, OP1, N, OP2, H) \ |
825 | do { \ |
826 | if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \ |
827 | printk(KERN_ERR "\n"); \ |
828 | printk(KERN_ERR "AFS: Assertion failed\n"); \ |
829 | printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \ |
830 | (unsigned long)(L), (unsigned long)(N), \ |
831 | (unsigned long)(H)); \ |
832 | printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \ |
833 | (unsigned long)(L), (unsigned long)(N), \ |
834 | (unsigned long)(H)); \ |
835 | BUG(); \ |
836 | } \ |
837 | } while(0) |
838 | |
839 | #define ASSERTIF(C, X) \ |
840 | do { \ |
841 | if (unlikely((C) && !(X))) { \ |
842 | printk(KERN_ERR "\n"); \ |
843 | printk(KERN_ERR "AFS: Assertion failed\n"); \ |
844 | BUG(); \ |
845 | } \ |
846 | } while(0) |
847 | |
848 | #define ASSERTIFCMP(C, X, OP, Y) \ |
849 | do { \ |
850 | if (unlikely((C) && !((X) OP (Y)))) { \ |
851 | printk(KERN_ERR "\n"); \ |
852 | printk(KERN_ERR "AFS: Assertion failed\n"); \ |
853 | printk(KERN_ERR "%lu " #OP " %lu is false\n", \ |
854 | (unsigned long)(X), (unsigned long)(Y)); \ |
855 | printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \ |
856 | (unsigned long)(X), (unsigned long)(Y)); \ |
857 | BUG(); \ |
858 | } \ |
859 | } while(0) |
860 | |
861 | #else |
862 | |
863 | #define ASSERT(X) \ |
864 | do { \ |
865 | } while(0) |
866 | |
867 | #define ASSERTCMP(X, OP, Y) \ |
868 | do { \ |
869 | } while(0) |
870 | |
871 | #define ASSERTRANGE(L, OP1, N, OP2, H) \ |
872 | do { \ |
873 | } while(0) |
874 | |
875 | #define ASSERTIF(C, X) \ |
876 | do { \ |
877 | } while(0) |
878 | |
879 | #define ASSERTIFCMP(C, X, OP, Y) \ |
880 | do { \ |
881 | } while(0) |
882 | |
883 | #endif /* __KDEBUGALL */ |
884 |
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