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David Howellsec268152007-04-26 15:49:28 -07001/* internal AFS stuff
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
David Howells08e0e7c2007-04-26 15:55:03 -07003 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/compiler.h>
13#include <linux/kernel.h>
14#include <linux/fs.h>
15#include <linux/pagemap.h>
David Howells08e0e7c2007-04-26 15:55:03 -070016#include <linux/skbuff.h>
17#include <linux/rxrpc.h>
David Howells00d3b7a2007-04-26 15:57:07 -070018#include <linux/key.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040019#include <linux/workqueue.h>
Andrew Morton00c541e2007-05-31 00:40:52 -070020#include <linux/sched.h>
Christoph Hellwig80e50be2009-10-01 15:44:27 -070021#include <linux/fscache.h>
Andrew Morton00c541e2007-05-31 00:40:52 -070022
David Howells08e0e7c2007-04-26 15:55:03 -070023#include "afs.h"
24#include "afs_vl.h"
25
26#define AFS_CELL_MAX_ADDRS 15
27
David Howells31143d52007-05-09 02:33:46 -070028struct pagevec;
David Howells08e0e7c2007-04-26 15:55:03 -070029struct afs_call;
30
31typedef 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
David Howells00d3b7a2007-04-26 15:57:07 -070041struct 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070052/*
David Howells08e0e7c2007-04-26 15:55:03 -070053 * definition of how to wait for the completion of an operation
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 */
David Howells08e0e7c2007-04-26 15:55:03 -070055struct afs_wait_mode {
56 /* RxRPC received message notification */
57 void (*rx_wakeup)(struct afs_call *call);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
David Howells08e0e7c2007-04-26 15:55:03 -070059 /* 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
66extern const struct afs_wait_mode afs_sync_call;
67extern const struct afs_wait_mode afs_async_call;
68
69/*
70 * a record of an in-progress RxRPC call
71 */
72struct 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) */
David Howells31143d52007-05-09 02:33:46 -070083 struct address_space *mapping; /* page set */
84 struct afs_writeback *wb; /* writeback being performed */
David Howells08e0e7c2007-04-26 15:55:03 -070085 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) */
David Howells260a9802007-04-26 15:59:35 -070089 void *reply4; /* reply buffer (fourth part) */
David Howells31143d52007-05-09 02:33:46 -070090 pgoff_t first; /* first page in mapping to deal with */
91 pgoff_t last; /* last page in mapping to deal with */
David Howells08e0e7c2007-04-26 15:55:03 -070092 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 */
David Howells31143d52007-05-09 02:33:46 -0700108 unsigned first_offset; /* offset into mapping[first] */
109 unsigned last_to; /* amount of mapping[last] */
David Howells08e0e7c2007-04-26 15:55:03 -0700110 unsigned short offset; /* offset into received data store */
111 unsigned char unmarshall; /* unmarshalling phase */
112 bool incoming; /* T if incoming call */
David Howells31143d52007-05-09 02:33:46 -0700113 bool send_pages; /* T if data from mapping should be sent */
David Howells08e0e7c2007-04-26 15:55:03 -0700114 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 */
David Howells31143d52007-05-09 02:33:46 -0700119 afs_dataversion_t store_version; /* updated version expected from store */
David Howells08e0e7c2007-04-26 15:55:03 -0700120};
121
122struct afs_call_type {
David Howells00d3b7a2007-04-26 15:57:07 -0700123 const char *name;
124
David Howells08e0e7c2007-04-26 15:55:03 -0700125 /* 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/*
David Howells31143d52007-05-09 02:33:46 -0700139 * record of an outstanding writeback on a vnode
140 */
141struct 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/*
David Howells08e0e7c2007-04-26 15:55:03 -0700165 * AFS superblock private data
166 * - there's one superblock per volume
167 */
168struct afs_super_info {
169 struct afs_volume *volume; /* volume record */
170 char rwparent; /* T if parent is R/W AFS volume */
171};
172
173static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
174{
175 return sb->s_fs_info;
176}
177
178extern struct file_system_type afs_fs_type;
179
180/*
181 * entry in the cached cell catalogue
182 */
183struct afs_cache_cell {
David Howells00d3b7a2007-04-26 15:57:07 -0700184 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */
185 struct in_addr vl_servers[15]; /* cached cell VL servers */
David Howells08e0e7c2007-04-26 15:55:03 -0700186};
187
188/*
189 * AFS cell record
190 */
191struct afs_cell {
192 atomic_t usage;
193 struct list_head link; /* main cell list link */
David Howells00d3b7a2007-04-26 15:57:07 -0700194 struct key *anonymous_key; /* anonymous user key for this cell */
David Howells08e0e7c2007-04-26 15:55:03 -0700195 struct list_head proc_link; /* /proc cell list link */
196 struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
David Howells9b3f26c2009-04-03 16:42:41 +0100197#ifdef CONFIG_AFS_FSCACHE
198 struct fscache_cookie *cache; /* caching cookie */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#endif
200
David Howells08e0e7c2007-04-26 15:55:03 -0700201 /* server record management */
202 rwlock_t servers_lock; /* active server list lock */
203 struct list_head servers; /* active server list */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
David Howells08e0e7c2007-04-26 15:55:03 -0700205 /* 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 */
219struct afs_cache_vlocation {
David Howells00d3b7a2007-04-26 15:57:07 -0700220 /* volume name (lowercase, padded with NULs) */
221 uint8_t name[AFS_MAXVOLNAME + 1];
222
David Howells08e0e7c2007-04-26 15:55:03 -0700223 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 */
238struct 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 */
246struct 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 */
David Howells9b3f26c2009-04-03 16:42:41 +0100253#ifdef CONFIG_AFS_FSCACHE
254 struct fscache_cookie *cache; /* caching cookie */
David Howells08e0e7c2007-04-26 15:55:03 -0700255#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 */
David S. Miller39bf0942007-04-26 20:39:14 -0700260 spinlock_t lock; /* access lock */
David Howells08e0e7c2007-04-26 15:55:03 -0700261 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 */
270struct 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 */
302struct afs_volume {
303 atomic_t usage;
304 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
305 struct afs_vlocation *vlocation; /* volume location */
David Howells9b3f26c2009-04-03 16:42:41 +0100306#ifdef CONFIG_AFS_FSCACHE
307 struct fscache_cookie *cache; /* caching cookie */
David Howells08e0e7c2007-04-26 15:55:03 -0700308#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 */
321struct 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 */
330struct 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 */
David Howells9b3f26c2009-04-03 16:42:41 +0100337#ifdef CONFIG_AFS_FSCACHE
338 struct fscache_cookie *cache; /* caching cookie */
David Howells08e0e7c2007-04-26 15:55:03 -0700339#endif
David Howells00d3b7a2007-04-26 15:57:07 -0700340 struct afs_permits *permits; /* cache of permits so far obtained */
341 struct mutex permits_lock; /* lock for altering permits list */
David Howells260a9802007-04-26 15:59:35 -0700342 struct mutex validate_lock; /* lock for validating this vnode */
David Howells08e0e7c2007-04-26 15:55:03 -0700343 wait_queue_head_t update_waitq; /* status fetch waitqueue */
David Howells260a9802007-04-26 15:59:35 -0700344 int update_cnt; /* number of outstanding ops that will update the
David Howells08e0e7c2007-04-26 15:55:03 -0700345 * status */
David Howells31143d52007-05-09 02:33:46 -0700346 spinlock_t writeback_lock; /* lock for writebacks */
David Howells08e0e7c2007-04-26 15:55:03 -0700347 spinlock_t lock; /* waitqueue/flags lock */
348 unsigned long flags;
349#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
David Howells260a9802007-04-26 15:59:35 -0700350#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
David Howells08e0e7c2007-04-26 15:55:03 -0700351#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 */
David Howellse8d6c552007-07-15 23:40:12 -0700355#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 */
David Howells08e0e7c2007-04-26 15:55:03 -0700359
David Howells00d3b7a2007-04-26 15:57:07 -0700360 long acl_order; /* ACL check count (callback break count) */
361
David Howells31143d52007-05-09 02:33:46 -0700362 struct list_head writebacks; /* alterations in pagecache that need writing */
David Howellse8d6c552007-07-15 23:40:12 -0700363 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 */
David Howells31143d52007-05-09 02:33:46 -0700367
David Howells08e0e7c2007-04-26 15:55:03 -0700368 /* 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 */
David Howells08e0e7c2007-04-26 15:55:03 -0700372 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
David Howells00d3b7a2007-04-26 15:57:07 -0700380/*
381 * cached security record for one user's attempt to access a vnode
382 */
383struct 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 */
391struct 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
David Howellsb908fe62007-04-26 15:58:17 -0700397/*
398 * record of one of a system's set of network interfaces
399 */
400struct afs_interface {
David Howellsb908fe62007-04-26 15:58:17 -0700401 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 */
414struct 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 */
David Howellsb1bdb692007-04-27 15:28:45 -0700418#define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
David Howellsb908fe62007-04-26 15:58:17 -0700419#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
David Howells08e0e7c2007-04-26 15:55:03 -0700430/*****************************************************************************/
431/*
David Howells9b3f26c2009-04-03 16:42:41 +0100432 * cache.c
433 */
434#ifdef CONFIG_AFS_FSCACHE
435extern struct fscache_netfs afs_cache_netfs;
436extern struct fscache_cookie_def afs_cell_cache_index_def;
437extern struct fscache_cookie_def afs_vlocation_cache_index_def;
438extern struct fscache_cookie_def afs_volume_cache_index_def;
439extern 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/*
David Howells08e0e7c2007-04-26 15:55:03 -0700448 * callback.c
449 */
450extern void afs_init_callback_state(struct afs_server *);
451extern void afs_broken_callback_work(struct work_struct *);
452extern void afs_break_callbacks(struct afs_server *, size_t,
453 struct afs_callback[]);
David Howells260a9802007-04-26 15:59:35 -0700454extern void afs_discard_callback_on_delete(struct afs_vnode *);
David Howells08e0e7c2007-04-26 15:55:03 -0700455extern void afs_give_up_callback(struct afs_vnode *);
456extern void afs_dispatch_give_up_callbacks(struct work_struct *);
457extern void afs_flush_callback_breaks(struct afs_server *);
458extern int __init afs_callback_update_init(void);
David Howellsfbb3fcb2007-05-03 03:12:46 -0700459extern void afs_callback_update_kill(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461/*
462 * cell.c
463 */
464extern struct rw_semaphore afs_proc_cells_sem;
465extern struct list_head afs_proc_cells;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
David Howells08e0e7c2007-04-26 15:55:03 -0700467#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
468extern int afs_cell_init(char *);
469extern struct afs_cell *afs_cell_create(const char *, char *);
470extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
471extern struct afs_cell *afs_grab_cell(struct afs_cell *);
472extern void afs_put_cell(struct afs_cell *);
473extern void afs_cell_purge(void);
474
475/*
476 * cmservice.c
477 */
478extern bool afs_cm_incoming_call(struct afs_call *);
479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480/*
481 * dir.c
482 */
Arjan van de Ven754661f2007-02-12 00:55:38 -0800483extern const struct inode_operations afs_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800484extern const struct file_operations afs_dir_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486/*
487 * file.c
488 */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700489extern const struct address_space_operations afs_fs_aops;
Arjan van de Ven754661f2007-02-12 00:55:38 -0800490extern const struct inode_operations afs_file_inode_operations;
David Howells00d3b7a2007-04-26 15:57:07 -0700491extern const struct file_operations afs_file_operations;
492
493extern int afs_open(struct inode *, struct file *);
494extern int afs_release(struct inode *, struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496/*
David Howellse8d6c552007-07-15 23:40:12 -0700497 * flock.c
498 */
499extern void __exit afs_kill_lock_manager(void);
500extern void afs_lock_work(struct work_struct *);
501extern void afs_lock_may_be_available(struct afs_vnode *);
502extern int afs_lock(struct file *, int, struct file_lock *);
503extern int afs_flock(struct file *, int, struct file_lock *);
504
505/*
David Howells08e0e7c2007-04-26 15:55:03 -0700506 * fsclient.c
507 */
David Howells00d3b7a2007-04-26 15:57:07 -0700508extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
509 struct afs_vnode *, struct afs_volsync *,
David Howells08e0e7c2007-04-26 15:55:03 -0700510 const struct afs_wait_mode *);
511extern int afs_fs_give_up_callbacks(struct afs_server *,
512 const struct afs_wait_mode *);
David Howells00d3b7a2007-04-26 15:57:07 -0700513extern int afs_fs_fetch_data(struct afs_server *, struct key *,
514 struct afs_vnode *, off_t, size_t, struct page *,
David Howells08e0e7c2007-04-26 15:55:03 -0700515 const struct afs_wait_mode *);
David Howells260a9802007-04-26 15:59:35 -0700516extern 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 *);
521extern int afs_fs_remove(struct afs_server *, struct key *,
522 struct afs_vnode *, const char *, bool,
523 const struct afs_wait_mode *);
524extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
525 struct afs_vnode *, const char *,
526 const struct afs_wait_mode *);
527extern 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 *);
531extern 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 *);
David Howells31143d52007-05-09 02:33:46 -0700535extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
536 pgoff_t, pgoff_t, unsigned, unsigned,
537 const struct afs_wait_mode *);
538extern int afs_fs_setattr(struct afs_server *, struct key *,
539 struct afs_vnode *, struct iattr *,
540 const struct afs_wait_mode *);
David Howells45222b92007-05-10 22:22:20 -0700541extern 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 *);
David Howellse8d6c552007-07-15 23:40:12 -0700545extern int afs_fs_set_lock(struct afs_server *, struct key *,
546 struct afs_vnode *, afs_lock_type_t,
547 const struct afs_wait_mode *);
548extern int afs_fs_extend_lock(struct afs_server *, struct key *,
549 struct afs_vnode *,
550 const struct afs_wait_mode *);
551extern int afs_fs_release_lock(struct afs_server *, struct key *,
552 struct afs_vnode *,
553 const struct afs_wait_mode *);
David Howells08e0e7c2007-04-26 15:55:03 -0700554
555/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 * inode.c
557 */
David Howells00d3b7a2007-04-26 15:57:07 -0700558extern struct inode *afs_iget(struct super_block *, struct key *,
David Howells260a9802007-04-26 15:59:35 -0700559 struct afs_fid *, struct afs_file_status *,
560 struct afs_callback *);
David Howells416351f2007-05-09 02:33:45 -0700561extern void afs_zap_data(struct afs_vnode *);
David Howells260a9802007-04-26 15:59:35 -0700562extern int afs_validate(struct afs_vnode *, struct key *);
David Howells416351f2007-05-09 02:33:45 -0700563extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells31143d52007-05-09 02:33:46 -0700564extern int afs_setattr(struct dentry *, struct iattr *);
David Howellsec268152007-04-26 15:49:28 -0700565extern void afs_clear_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567/*
568 * main.c
569 */
David Howellsb908fe62007-04-26 15:58:17 -0700570extern struct afs_uuid afs_uuid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572/*
David Howells08e0e7c2007-04-26 15:55:03 -0700573 * misc.c
574 */
575extern int afs_abort_to_error(u32);
576
577/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 * mntpt.c
579 */
Arjan van de Ven754661f2007-02-12 00:55:38 -0800580extern const struct inode_operations afs_mntpt_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800581extern const struct file_operations afs_mntpt_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
David Howells00d3b7a2007-04-26 15:57:07 -0700583extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
David Howells08e0e7c2007-04-26 15:55:03 -0700584extern void afs_mntpt_kill_timer(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 * proc.c
588 */
589extern int afs_proc_init(void);
590extern void afs_proc_cleanup(void);
David Howellsec268152007-04-26 15:49:28 -0700591extern int afs_proc_cell_setup(struct afs_cell *);
592extern void afs_proc_cell_remove(struct afs_cell *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
David Howells08e0e7c2007-04-26 15:55:03 -0700594/*
595 * rxrpc.c
596 */
597extern int afs_open_socket(void);
598extern void afs_close_socket(void);
599extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
600 const struct afs_wait_mode *);
601extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
602 size_t, size_t);
603extern void afs_flat_call_destructor(struct afs_call *);
604extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
605extern void afs_send_empty_reply(struct afs_call *);
David Howellsb908fe62007-04-26 15:58:17 -0700606extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
David Howells08e0e7c2007-04-26 15:55:03 -0700607extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
608 size_t);
609
610/*
David Howells00d3b7a2007-04-26 15:57:07 -0700611 * security.c
612 */
613extern void afs_clear_permits(struct afs_vnode *);
614extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
David Howells416351f2007-05-09 02:33:45 -0700615extern void afs_zap_permits(struct rcu_head *);
David Howells00d3b7a2007-04-26 15:57:07 -0700616extern struct key *afs_request_key(struct afs_cell *);
Al Viroe6305c42008-07-15 21:03:57 -0400617extern int afs_permission(struct inode *, int);
David Howells00d3b7a2007-04-26 15:57:07 -0700618
619/*
David Howells08e0e7c2007-04-26 15:55:03 -0700620 * server.c
621 */
622extern spinlock_t afs_server_peer_lock;
623
David Howells260a9802007-04-26 15:59:35 -0700624#define afs_get_server(S) \
625do { \
626 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \
627 atomic_inc(&(S)->usage); \
628} while(0)
David Howells08e0e7c2007-04-26 15:55:03 -0700629
630extern struct afs_server *afs_lookup_server(struct afs_cell *,
631 const struct in_addr *);
632extern struct afs_server *afs_find_server(const struct in_addr *);
633extern void afs_put_server(struct afs_server *);
634extern void __exit afs_purge_servers(void);
635
636/*
David Howells00d3b7a2007-04-26 15:57:07 -0700637 * super.c
638 */
639extern int afs_fs_init(void);
640extern void afs_fs_exit(void);
641
642/*
David Howellsb908fe62007-04-26 15:58:17 -0700643 * use-rtnetlink.c
644 */
645extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
David Howellsec9c9482007-05-03 03:29:41 -0700646extern int afs_get_MAC_address(u8 *, size_t);
David Howellsb908fe62007-04-26 15:58:17 -0700647
648/*
David Howells08e0e7c2007-04-26 15:55:03 -0700649 * vlclient.c
650 */
David Howells00d3b7a2007-04-26 15:57:07 -0700651extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
652 const char *, struct afs_cache_vlocation *,
David Howells08e0e7c2007-04-26 15:55:03 -0700653 const struct afs_wait_mode *);
David Howells00d3b7a2007-04-26 15:57:07 -0700654extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
655 afs_volid_t, afs_voltype_t,
David Howells08e0e7c2007-04-26 15:55:03 -0700656 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
664extern int __init afs_vlocation_update_init(void);
665extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
David Howells00d3b7a2007-04-26 15:57:07 -0700666 struct key *,
David Howells08e0e7c2007-04-26 15:55:03 -0700667 const char *, size_t);
668extern void afs_put_vlocation(struct afs_vlocation *);
David Howellsfbb3fcb2007-05-03 03:12:46 -0700669extern void afs_vlocation_purge(void);
David Howells08e0e7c2007-04-26 15:55:03 -0700670
671/*
672 * vnode.c
673 */
David Howells08e0e7c2007-04-26 15:55:03 -0700674static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
675{
676 return container_of(inode, struct afs_vnode, vfs_inode);
677}
678
679static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
680{
681 return &vnode->vfs_inode;
682}
683
David Howells260a9802007-04-26 15:59:35 -0700684extern void afs_vnode_finalise_status_update(struct afs_vnode *,
685 struct afs_server *);
David Howells00d3b7a2007-04-26 15:57:07 -0700686extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
687 struct key *);
688extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
689 off_t, size_t, struct page *);
David Howells260a9802007-04-26 15:59:35 -0700690extern 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 **);
693extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
694 bool);
695extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
696 const char *);
697extern 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 **);
700extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
701 struct key *, const char *, const char *);
David Howells31143d52007-05-09 02:33:46 -0700702extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
703 unsigned, unsigned);
704extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
David Howells45222b92007-05-10 22:22:20 -0700705extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
706 struct afs_volume_status *);
David Howellse8d6c552007-07-15 23:40:12 -0700707extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
708 afs_lock_type_t);
709extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
710extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
David Howells08e0e7c2007-04-26 15:55:03 -0700711
712/*
713 * volume.c
714 */
David Howells08e0e7c2007-04-26 15:55:03 -0700715#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
716
717extern void afs_put_volume(struct afs_volume *);
David Howells00d3b7a2007-04-26 15:57:07 -0700718extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
David Howells08e0e7c2007-04-26 15:55:03 -0700719extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
720extern int afs_volume_release_fileserver(struct afs_vnode *,
721 struct afs_server *, int);
722
David Howells31143d52007-05-09 02:33:46 -0700723/*
724 * write.c
725 */
726extern int afs_set_page_dirty(struct page *);
727extern void afs_put_writeback(struct afs_writeback *);
Nick Piggin15b46502008-10-15 22:04:32 -0700728extern 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);
731extern 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);
David Howells31143d52007-05-09 02:33:46 -0700734extern int afs_writepage(struct page *, struct writeback_control *);
735extern int afs_writepages(struct address_space *, struct writeback_control *);
736extern int afs_write_inode(struct inode *, int);
737extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
738extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
739 unsigned long, loff_t);
740extern int afs_writeback_all(struct afs_vnode *);
741extern int afs_fsync(struct file *, struct dentry *, int);
742
743
David Howells08e0e7c2007-04-26 15:55:03 -0700744/*****************************************************************************/
745/*
746 * debug tracing
747 */
748extern unsigned afs_debug;
749
750#define dbgprintk(FMT,...) \
Sven Schnellead16df82008-04-03 10:44:01 +0100751 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
David Howells08e0e7c2007-04-26 15:55:03 -0700752
753/* make sure we maintain the format strings, even when debugging is disabled */
754static inline __attribute__((format(printf,1,2)))
755void _dbprintk(const char *fmt, ...)
756{
757}
758
Harvey Harrison530b6412008-04-30 00:55:09 -0700759#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
760#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
David Howells08e0e7c2007-04-26 15:55:03 -0700761#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,...) \
775do { \
776 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
777 kenter(FMT,##__VA_ARGS__); \
778} while (0)
779
780#define _leave(FMT,...) \
781do { \
782 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
783 kleave(FMT,##__VA_ARGS__); \
784} while (0)
785
786#define _debug(FMT,...) \
787do { \
788 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
789 kdebug(FMT,##__VA_ARGS__); \
790} while (0)
791
792#else
Harvey Harrison530b6412008-04-30 00:55:09 -0700793#define _enter(FMT,...) _dbprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
794#define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
David Howells08e0e7c2007-04-26 15:55:03 -0700795#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) \
804do { \
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) \
813do { \
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
David Howells416351f2007-05-09 02:33:45 -0700825#define ASSERTRANGE(L, OP1, N, OP2, H) \
826do { \
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
David Howells08e0e7c2007-04-26 15:55:03 -0700840#define ASSERTIF(C, X) \
841do { \
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) \
850do { \
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) \
865do { \
866} while(0)
867
868#define ASSERTCMP(X, OP, Y) \
869do { \
870} while(0)
871
David Howells416351f2007-05-09 02:33:45 -0700872#define ASSERTRANGE(L, OP1, N, OP2, H) \
873do { \
874} while(0)
875
David Howells08e0e7c2007-04-26 15:55:03 -0700876#define ASSERTIF(C, X) \
877do { \
878} while(0)
879
880#define ASSERTIFCMP(C, X, OP, Y) \
881do { \
882} while(0)
883
884#endif /* __KDEBUGALL */