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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>
Jens Axboee1da0222010-04-22 11:58:18 +020022#include <linux/backing-dev.h>
Andrew Morton00c541e2007-05-31 00:40:52 -070023
David Howells08e0e7c2007-04-26 15:55:03 -070024#include "afs.h"
25#include "afs_vl.h"
26
27#define AFS_CELL_MAX_ADDRS 15
28
David Howells31143d52007-05-09 02:33:46 -070029struct pagevec;
David Howells08e0e7c2007-04-26 15:55:03 -070030struct afs_call;
31
32typedef enum {
33 AFS_VL_NEW, /* new, uninitialised record */
34 AFS_VL_CREATING, /* creating record */
35 AFS_VL_VALID, /* record is pending */
36 AFS_VL_NO_VOLUME, /* no such volume available */
37 AFS_VL_UPDATING, /* update in progress */
38 AFS_VL_VOLUME_DELETED, /* volume was deleted */
39 AFS_VL_UNCERTAIN, /* uncertain state (update failed) */
40} __attribute__((packed)) afs_vlocation_state_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
David Howells00d3b7a2007-04-26 15:57:07 -070042struct afs_mount_params {
43 bool rwpath; /* T if the parent should be considered R/W */
44 bool force; /* T to force cell type */
45 afs_voltype_t type; /* type of volume requested */
46 int volnamesz; /* size of volume name */
47 const char *volname; /* name of volume to mount */
48 struct afs_cell *cell; /* cell in which to find volume */
49 struct afs_volume *volume; /* volume record */
50 struct key *key; /* key to use for secure mounting */
51};
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053/*
David Howells08e0e7c2007-04-26 15:55:03 -070054 * definition of how to wait for the completion of an operation
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 */
David Howells08e0e7c2007-04-26 15:55:03 -070056struct afs_wait_mode {
57 /* RxRPC received message notification */
58 void (*rx_wakeup)(struct afs_call *call);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
David Howells08e0e7c2007-04-26 15:55:03 -070060 /* synchronous call waiter and call dispatched notification */
61 int (*wait)(struct afs_call *call);
62
63 /* asynchronous call completion */
64 void (*async_complete)(void *reply, int error);
65};
66
67extern const struct afs_wait_mode afs_sync_call;
68extern const struct afs_wait_mode afs_async_call;
69
70/*
71 * a record of an in-progress RxRPC call
72 */
73struct afs_call {
74 const struct afs_call_type *type; /* type of call */
75 const struct afs_wait_mode *wait_mode; /* completion wait mode */
76 wait_queue_head_t waitq; /* processes awaiting completion */
77 struct work_struct async_work; /* asynchronous work processor */
78 struct work_struct work; /* actual work processor */
79 struct sk_buff_head rx_queue; /* received packets */
80 struct rxrpc_call *rxcall; /* RxRPC call handle */
81 struct key *key; /* security for this call */
82 struct afs_server *server; /* server affected by incoming CM call */
83 void *request; /* request data (first part) */
David Howells31143d52007-05-09 02:33:46 -070084 struct address_space *mapping; /* page set */
85 struct afs_writeback *wb; /* writeback being performed */
David Howells08e0e7c2007-04-26 15:55:03 -070086 void *buffer; /* reply receive buffer */
87 void *reply; /* reply buffer (first part) */
88 void *reply2; /* reply buffer (second part) */
89 void *reply3; /* reply buffer (third part) */
David Howells260a9802007-04-26 15:59:35 -070090 void *reply4; /* reply buffer (fourth part) */
David Howells31143d52007-05-09 02:33:46 -070091 pgoff_t first; /* first page in mapping to deal with */
92 pgoff_t last; /* last page in mapping to deal with */
David Howells08e0e7c2007-04-26 15:55:03 -070093 enum { /* call state */
94 AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
95 AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
96 AFS_CALL_AWAIT_OP_ID, /* awaiting op ID on incoming call */
97 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
98 AFS_CALL_REPLYING, /* replying to incoming call */
99 AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */
100 AFS_CALL_COMPLETE, /* successfully completed */
101 AFS_CALL_BUSY, /* server was busy */
102 AFS_CALL_ABORTED, /* call was aborted */
103 AFS_CALL_ERROR, /* call failed due to error */
104 } state;
105 int error; /* error code */
106 unsigned request_size; /* size of request data */
107 unsigned reply_max; /* maximum size of reply */
108 unsigned reply_size; /* current size of reply */
David Howells31143d52007-05-09 02:33:46 -0700109 unsigned first_offset; /* offset into mapping[first] */
110 unsigned last_to; /* amount of mapping[last] */
David Howells08e0e7c2007-04-26 15:55:03 -0700111 unsigned short offset; /* offset into received data store */
112 unsigned char unmarshall; /* unmarshalling phase */
113 bool incoming; /* T if incoming call */
David Howells31143d52007-05-09 02:33:46 -0700114 bool send_pages; /* T if data from mapping should be sent */
David Howells08e0e7c2007-04-26 15:55:03 -0700115 u16 service_id; /* RxRPC service ID to call */
116 __be16 port; /* target UDP port */
117 __be32 operation_ID; /* operation ID for an incoming call */
118 u32 count; /* count for use in unmarshalling */
119 __be32 tmp; /* place to extract temporary data */
David Howells31143d52007-05-09 02:33:46 -0700120 afs_dataversion_t store_version; /* updated version expected from store */
David Howells08e0e7c2007-04-26 15:55:03 -0700121};
122
123struct afs_call_type {
David Howells00d3b7a2007-04-26 15:57:07 -0700124 const char *name;
125
David Howells08e0e7c2007-04-26 15:55:03 -0700126 /* deliver request or reply data to an call
127 * - returning an error will cause the call to be aborted
128 */
129 int (*deliver)(struct afs_call *call, struct sk_buff *skb,
130 bool last);
131
132 /* map an abort code to an error number */
133 int (*abort_to_error)(u32 abort_code);
134
135 /* clean up a call */
136 void (*destructor)(struct afs_call *call);
137};
138
139/*
David Howells31143d52007-05-09 02:33:46 -0700140 * record of an outstanding writeback on a vnode
141 */
142struct afs_writeback {
143 struct list_head link; /* link in vnode->writebacks */
144 struct work_struct writer; /* work item to perform the writeback */
145 struct afs_vnode *vnode; /* vnode to which this write applies */
146 struct key *key; /* owner of this write */
147 wait_queue_head_t waitq; /* completion and ready wait queue */
148 pgoff_t first; /* first page in batch */
149 pgoff_t point; /* last page in current store op */
150 pgoff_t last; /* last page in batch (inclusive) */
151 unsigned offset_first; /* offset into first page of start of write */
152 unsigned to_last; /* offset into last page of end of write */
153 int num_conflicts; /* count of conflicting writes in list */
154 int usage;
155 bool conflicts; /* T if has dependent conflicts */
156 enum {
157 AFS_WBACK_SYNCING, /* synchronisation being performed */
158 AFS_WBACK_PENDING, /* write pending */
159 AFS_WBACK_CONFLICTING, /* conflicting writes posted */
160 AFS_WBACK_WRITING, /* writing back */
161 AFS_WBACK_COMPLETE /* the writeback record has been unlinked */
162 } state __attribute__((packed));
163};
164
165/*
David Howells08e0e7c2007-04-26 15:55:03 -0700166 * AFS superblock private data
167 * - there's one superblock per volume
168 */
169struct afs_super_info {
170 struct afs_volume *volume; /* volume record */
171 char rwparent; /* T if parent is R/W AFS volume */
172};
173
174static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
175{
176 return sb->s_fs_info;
177}
178
179extern struct file_system_type afs_fs_type;
180
181/*
182 * entry in the cached cell catalogue
183 */
184struct afs_cache_cell {
David Howells00d3b7a2007-04-26 15:57:07 -0700185 char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */
186 struct in_addr vl_servers[15]; /* cached cell VL servers */
David Howells08e0e7c2007-04-26 15:55:03 -0700187};
188
189/*
190 * AFS cell record
191 */
192struct afs_cell {
193 atomic_t usage;
194 struct list_head link; /* main cell list link */
David Howells00d3b7a2007-04-26 15:57:07 -0700195 struct key *anonymous_key; /* anonymous user key for this cell */
David Howells08e0e7c2007-04-26 15:55:03 -0700196 struct list_head proc_link; /* /proc cell list link */
197 struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
David Howells9b3f26c2009-04-03 16:42:41 +0100198#ifdef CONFIG_AFS_FSCACHE
199 struct fscache_cookie *cache; /* caching cookie */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#endif
201
David Howells08e0e7c2007-04-26 15:55:03 -0700202 /* server record management */
203 rwlock_t servers_lock; /* active server list lock */
204 struct list_head servers; /* active server list */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
David Howells08e0e7c2007-04-26 15:55:03 -0700206 /* volume location record management */
207 struct rw_semaphore vl_sem; /* volume management serialisation semaphore */
208 struct list_head vl_list; /* cell's active VL record list */
209 spinlock_t vl_lock; /* vl_list lock */
210 unsigned short vl_naddrs; /* number of VL servers in addr list */
211 unsigned short vl_curr_svix; /* current server index */
212 struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */
213
214 char name[0]; /* cell name - must go last */
215};
216
217/*
218 * entry in the cached volume location catalogue
219 */
220struct afs_cache_vlocation {
David Howells00d3b7a2007-04-26 15:57:07 -0700221 /* volume name (lowercase, padded with NULs) */
222 uint8_t name[AFS_MAXVOLNAME + 1];
223
David Howells08e0e7c2007-04-26 15:55:03 -0700224 uint8_t nservers; /* number of entries used in servers[] */
225 uint8_t vidmask; /* voltype mask for vid[] */
226 uint8_t srvtmask[8]; /* voltype masks for servers[] */
227#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
228#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
229#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
230
231 afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
232 struct in_addr servers[8]; /* fileserver addresses */
233 time_t rtime; /* last retrieval time */
234};
235
236/*
237 * volume -> vnode hash table entry
238 */
239struct afs_cache_vhash {
240 afs_voltype_t vtype; /* which volume variation */
241 uint8_t hash_bucket; /* which hash bucket this represents */
242} __attribute__((packed));
243
244/*
245 * AFS volume location record
246 */
247struct afs_vlocation {
248 atomic_t usage;
249 time_t time_of_death; /* time at which put reduced usage to 0 */
250 struct list_head link; /* link in cell volume location list */
251 struct list_head grave; /* link in master graveyard list */
252 struct list_head update; /* link in master update list */
253 struct afs_cell *cell; /* cell to which volume belongs */
David Howells9b3f26c2009-04-03 16:42:41 +0100254#ifdef CONFIG_AFS_FSCACHE
255 struct fscache_cookie *cache; /* caching cookie */
David Howells08e0e7c2007-04-26 15:55:03 -0700256#endif
257 struct afs_cache_vlocation vldb; /* volume information DB record */
258 struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
259 wait_queue_head_t waitq; /* status change waitqueue */
260 time_t update_at; /* time at which record should be updated */
David S. Miller39bf0942007-04-26 20:39:14 -0700261 spinlock_t lock; /* access lock */
David Howells08e0e7c2007-04-26 15:55:03 -0700262 afs_vlocation_state_t state; /* volume location state */
263 unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
264 unsigned short upd_busy_cnt; /* EBUSY count during update */
265 bool valid; /* T if valid */
266};
267
268/*
269 * AFS fileserver record
270 */
271struct afs_server {
272 atomic_t usage;
273 time_t time_of_death; /* time at which put reduced usage to 0 */
274 struct in_addr addr; /* server address */
275 struct afs_cell *cell; /* cell in which server resides */
276 struct list_head link; /* link in cell's server list */
277 struct list_head grave; /* link in master graveyard list */
278 struct rb_node master_rb; /* link in master by-addr tree */
279 struct rw_semaphore sem; /* access lock */
280
281 /* file service access */
282 struct rb_root fs_vnodes; /* vnodes backed by this server (ordered by FID) */
283 unsigned long fs_act_jif; /* time at which last activity occurred */
284 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
285 spinlock_t fs_lock; /* access lock */
286 int fs_state; /* 0 or reason FS currently marked dead (-errno) */
287
288 /* callback promise management */
289 struct rb_root cb_promises; /* vnode expiration list (ordered earliest first) */
290 struct delayed_work cb_updater; /* callback updater */
291 struct delayed_work cb_break_work; /* collected break dispatcher */
292 wait_queue_head_t cb_break_waitq; /* space available in cb_break waitqueue */
293 spinlock_t cb_lock; /* access lock */
294 struct afs_callback cb_break[64]; /* ring of callbacks awaiting breaking */
295 atomic_t cb_break_n; /* number of pending breaks */
296 u8 cb_break_head; /* head of callback breaking ring */
297 u8 cb_break_tail; /* tail of callback breaking ring */
298};
299
300/*
301 * AFS volume access record
302 */
303struct afs_volume {
304 atomic_t usage;
305 struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
306 struct afs_vlocation *vlocation; /* volume location */
David Howells9b3f26c2009-04-03 16:42:41 +0100307#ifdef CONFIG_AFS_FSCACHE
308 struct fscache_cookie *cache; /* caching cookie */
David Howells08e0e7c2007-04-26 15:55:03 -0700309#endif
310 afs_volid_t vid; /* volume ID */
311 afs_voltype_t type; /* type of volume */
312 char type_force; /* force volume type (suppress R/O -> R/W) */
313 unsigned short nservers; /* number of server slots filled */
314 unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
315 struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
316 struct rw_semaphore server_sem; /* lock for accessing current server */
Jens Axboee1da0222010-04-22 11:58:18 +0200317 struct backing_dev_info bdi;
David Howells08e0e7c2007-04-26 15:55:03 -0700318};
319
320/*
321 * vnode catalogue entry
322 */
323struct afs_cache_vnode {
324 afs_vnodeid_t vnode_id; /* vnode ID */
325 unsigned vnode_unique; /* vnode ID uniquifier */
326 afs_dataversion_t data_version; /* data version */
327};
328
329/*
330 * AFS inode private data
331 */
332struct afs_vnode {
333 struct inode vfs_inode; /* the VFS's inode record */
334
335 struct afs_volume *volume; /* volume on which vnode resides */
336 struct afs_server *server; /* server currently supplying this file */
337 struct afs_fid fid; /* the file identifier for this inode */
338 struct afs_file_status status; /* AFS status info for this file */
David Howells9b3f26c2009-04-03 16:42:41 +0100339#ifdef CONFIG_AFS_FSCACHE
340 struct fscache_cookie *cache; /* caching cookie */
David Howells08e0e7c2007-04-26 15:55:03 -0700341#endif
David Howells00d3b7a2007-04-26 15:57:07 -0700342 struct afs_permits *permits; /* cache of permits so far obtained */
343 struct mutex permits_lock; /* lock for altering permits list */
David Howells260a9802007-04-26 15:59:35 -0700344 struct mutex validate_lock; /* lock for validating this vnode */
David Howells08e0e7c2007-04-26 15:55:03 -0700345 wait_queue_head_t update_waitq; /* status fetch waitqueue */
David Howells260a9802007-04-26 15:59:35 -0700346 int update_cnt; /* number of outstanding ops that will update the
David Howells08e0e7c2007-04-26 15:55:03 -0700347 * status */
David Howells31143d52007-05-09 02:33:46 -0700348 spinlock_t writeback_lock; /* lock for writebacks */
David Howells08e0e7c2007-04-26 15:55:03 -0700349 spinlock_t lock; /* waitqueue/flags lock */
350 unsigned long flags;
351#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
David Howells260a9802007-04-26 15:59:35 -0700352#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
David Howells08e0e7c2007-04-26 15:55:03 -0700353#define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */
354#define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
355#define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
356#define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
David Howellse8d6c552007-07-15 23:40:12 -0700357#define AFS_VNODE_LOCKING 6 /* set if waiting for lock on vnode */
358#define AFS_VNODE_READLOCKED 7 /* set if vnode is read-locked on the server */
359#define AFS_VNODE_WRITELOCKED 8 /* set if vnode is write-locked on the server */
360#define AFS_VNODE_UNLOCKING 9 /* set if vnode is being unlocked on the server */
David Howells08e0e7c2007-04-26 15:55:03 -0700361
David Howells00d3b7a2007-04-26 15:57:07 -0700362 long acl_order; /* ACL check count (callback break count) */
363
David Howells31143d52007-05-09 02:33:46 -0700364 struct list_head writebacks; /* alterations in pagecache that need writing */
David Howellse8d6c552007-07-15 23:40:12 -0700365 struct list_head pending_locks; /* locks waiting to be granted */
366 struct list_head granted_locks; /* locks granted on this file */
367 struct delayed_work lock_work; /* work to be done in locking */
368 struct key *unlock_key; /* key to be used in unlocking */
David Howells31143d52007-05-09 02:33:46 -0700369
David Howells08e0e7c2007-04-26 15:55:03 -0700370 /* outstanding callback notification on this file */
371 struct rb_node server_rb; /* link in server->fs_vnodes */
372 struct rb_node cb_promise; /* link in server->cb_promises */
373 struct work_struct cb_broken_work; /* work to be done on callback break */
David Howells08e0e7c2007-04-26 15:55:03 -0700374 time_t cb_expires; /* time at which callback expires */
375 time_t cb_expires_at; /* time used to order cb_promise */
376 unsigned cb_version; /* callback version */
377 unsigned cb_expiry; /* callback expiry time */
378 afs_callback_type_t cb_type; /* type of callback */
379 bool cb_promised; /* true if promise still holds */
380};
381
David Howells00d3b7a2007-04-26 15:57:07 -0700382/*
383 * cached security record for one user's attempt to access a vnode
384 */
385struct afs_permit {
386 struct key *key; /* RxRPC ticket holding a security context */
387 afs_access_t access_mask; /* access mask for this key */
388};
389
390/*
391 * cache of security records from attempts to access a vnode
392 */
393struct afs_permits {
394 struct rcu_head rcu; /* disposal procedure */
395 int count; /* number of records */
396 struct afs_permit permits[0]; /* the permits so far examined */
397};
398
David Howellsb908fe62007-04-26 15:58:17 -0700399/*
400 * record of one of a system's set of network interfaces
401 */
402struct afs_interface {
David Howellsb908fe62007-04-26 15:58:17 -0700403 struct in_addr address; /* IPv4 address bound to interface */
404 struct in_addr netmask; /* netmask applied to address */
405 unsigned mtu; /* MTU of interface */
406};
407
408/*
409 * UUID definition [internet draft]
410 * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
411 * increments since midnight 15th October 1582
412 * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
413 * time
414 * - the clock sequence is a 14-bit counter to avoid duplicate times
415 */
416struct afs_uuid {
417 u32 time_low; /* low part of timestamp */
418 u16 time_mid; /* mid part of timestamp */
419 u16 time_hi_and_version; /* high part of timestamp and version */
David Howellsb1bdb692007-04-27 15:28:45 -0700420#define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
David Howellsb908fe62007-04-26 15:58:17 -0700421#define AFS_UUID_TIMEHI_MASK 0x0fff
422#define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */
423#define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */
424#define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
425 u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
426#define AFS_UUID_CLOCKHI_MASK 0x3f
427#define AFS_UUID_VARIANT_STD 0x80
428 u8 clock_seq_low; /* clock seq low */
429 u8 node[6]; /* spatially unique node ID (MAC addr) */
430};
431
David Howells08e0e7c2007-04-26 15:55:03 -0700432/*****************************************************************************/
433/*
David Howells9b3f26c2009-04-03 16:42:41 +0100434 * cache.c
435 */
436#ifdef CONFIG_AFS_FSCACHE
437extern struct fscache_netfs afs_cache_netfs;
438extern struct fscache_cookie_def afs_cell_cache_index_def;
439extern struct fscache_cookie_def afs_vlocation_cache_index_def;
440extern struct fscache_cookie_def afs_volume_cache_index_def;
441extern struct fscache_cookie_def afs_vnode_cache_index_def;
442#else
443#define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL)
444#define afs_vlocation_cache_index_def (*(struct fscache_cookie_def *) NULL)
445#define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL)
446#define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL)
447#endif
448
449/*
David Howells08e0e7c2007-04-26 15:55:03 -0700450 * callback.c
451 */
452extern void afs_init_callback_state(struct afs_server *);
453extern void afs_broken_callback_work(struct work_struct *);
454extern void afs_break_callbacks(struct afs_server *, size_t,
455 struct afs_callback[]);
David Howells260a9802007-04-26 15:59:35 -0700456extern void afs_discard_callback_on_delete(struct afs_vnode *);
David Howells08e0e7c2007-04-26 15:55:03 -0700457extern void afs_give_up_callback(struct afs_vnode *);
458extern void afs_dispatch_give_up_callbacks(struct work_struct *);
459extern void afs_flush_callback_breaks(struct afs_server *);
460extern int __init afs_callback_update_init(void);
David Howellsfbb3fcb2007-05-03 03:12:46 -0700461extern void afs_callback_update_kill(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463/*
464 * cell.c
465 */
466extern struct rw_semaphore afs_proc_cells_sem;
467extern struct list_head afs_proc_cells;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
David Howells08e0e7c2007-04-26 15:55:03 -0700469#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
470extern int afs_cell_init(char *);
471extern struct afs_cell *afs_cell_create(const char *, char *);
472extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
473extern struct afs_cell *afs_grab_cell(struct afs_cell *);
474extern void afs_put_cell(struct afs_cell *);
475extern void afs_cell_purge(void);
476
477/*
478 * cmservice.c
479 */
480extern bool afs_cm_incoming_call(struct afs_call *);
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482/*
483 * dir.c
484 */
Arjan van de Ven754661f2007-02-12 00:55:38 -0800485extern const struct inode_operations afs_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800486extern const struct file_operations afs_dir_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488/*
489 * file.c
490 */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700491extern const struct address_space_operations afs_fs_aops;
Arjan van de Ven754661f2007-02-12 00:55:38 -0800492extern const struct inode_operations afs_file_inode_operations;
David Howells00d3b7a2007-04-26 15:57:07 -0700493extern const struct file_operations afs_file_operations;
494
495extern int afs_open(struct inode *, struct file *);
496extern int afs_release(struct inode *, struct file *);
Al Virof6d335c2010-05-21 15:27:09 +0100497extern int afs_page_filler(void *, struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499/*
David Howellse8d6c552007-07-15 23:40:12 -0700500 * flock.c
501 */
502extern void __exit afs_kill_lock_manager(void);
503extern void afs_lock_work(struct work_struct *);
504extern void afs_lock_may_be_available(struct afs_vnode *);
505extern int afs_lock(struct file *, int, struct file_lock *);
506extern int afs_flock(struct file *, int, struct file_lock *);
507
508/*
David Howells08e0e7c2007-04-26 15:55:03 -0700509 * fsclient.c
510 */
David Howells00d3b7a2007-04-26 15:57:07 -0700511extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
512 struct afs_vnode *, struct afs_volsync *,
David Howells08e0e7c2007-04-26 15:55:03 -0700513 const struct afs_wait_mode *);
514extern int afs_fs_give_up_callbacks(struct afs_server *,
515 const struct afs_wait_mode *);
David Howells00d3b7a2007-04-26 15:57:07 -0700516extern int afs_fs_fetch_data(struct afs_server *, struct key *,
517 struct afs_vnode *, off_t, size_t, struct page *,
David Howells08e0e7c2007-04-26 15:55:03 -0700518 const struct afs_wait_mode *);
David Howells260a9802007-04-26 15:59:35 -0700519extern int afs_fs_create(struct afs_server *, struct key *,
520 struct afs_vnode *, const char *, umode_t,
521 struct afs_fid *, struct afs_file_status *,
522 struct afs_callback *,
523 const struct afs_wait_mode *);
524extern int afs_fs_remove(struct afs_server *, struct key *,
525 struct afs_vnode *, const char *, bool,
526 const struct afs_wait_mode *);
527extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
528 struct afs_vnode *, const char *,
529 const struct afs_wait_mode *);
530extern int afs_fs_symlink(struct afs_server *, struct key *,
531 struct afs_vnode *, const char *, const char *,
532 struct afs_fid *, struct afs_file_status *,
533 const struct afs_wait_mode *);
534extern int afs_fs_rename(struct afs_server *, struct key *,
535 struct afs_vnode *, const char *,
536 struct afs_vnode *, const char *,
537 const struct afs_wait_mode *);
David Howells31143d52007-05-09 02:33:46 -0700538extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
539 pgoff_t, pgoff_t, unsigned, unsigned,
540 const struct afs_wait_mode *);
541extern int afs_fs_setattr(struct afs_server *, struct key *,
542 struct afs_vnode *, struct iattr *,
543 const struct afs_wait_mode *);
David Howells45222b92007-05-10 22:22:20 -0700544extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
545 struct afs_vnode *,
546 struct afs_volume_status *,
547 const struct afs_wait_mode *);
David Howellse8d6c552007-07-15 23:40:12 -0700548extern int afs_fs_set_lock(struct afs_server *, struct key *,
549 struct afs_vnode *, afs_lock_type_t,
550 const struct afs_wait_mode *);
551extern int afs_fs_extend_lock(struct afs_server *, struct key *,
552 struct afs_vnode *,
553 const struct afs_wait_mode *);
554extern int afs_fs_release_lock(struct afs_server *, struct key *,
555 struct afs_vnode *,
556 const struct afs_wait_mode *);
David Howells08e0e7c2007-04-26 15:55:03 -0700557
558/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 * inode.c
560 */
David Howells00d3b7a2007-04-26 15:57:07 -0700561extern struct inode *afs_iget(struct super_block *, struct key *,
David Howells260a9802007-04-26 15:59:35 -0700562 struct afs_fid *, struct afs_file_status *,
563 struct afs_callback *);
David Howells416351f2007-05-09 02:33:45 -0700564extern void afs_zap_data(struct afs_vnode *);
David Howells260a9802007-04-26 15:59:35 -0700565extern int afs_validate(struct afs_vnode *, struct key *);
David Howells416351f2007-05-09 02:33:45 -0700566extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells31143d52007-05-09 02:33:46 -0700567extern int afs_setattr(struct dentry *, struct iattr *);
Al Virob57922d2010-06-07 14:34:48 -0400568extern void afs_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
570/*
571 * main.c
572 */
David Howellsb908fe62007-04-26 15:58:17 -0700573extern struct afs_uuid afs_uuid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575/*
David Howells08e0e7c2007-04-26 15:55:03 -0700576 * misc.c
577 */
578extern int afs_abort_to_error(u32);
579
580/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 * mntpt.c
582 */
Arjan van de Ven754661f2007-02-12 00:55:38 -0800583extern const struct inode_operations afs_mntpt_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800584extern const struct file_operations afs_mntpt_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
David Howells00d3b7a2007-04-26 15:57:07 -0700586extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
David Howells08e0e7c2007-04-26 15:55:03 -0700587extern void afs_mntpt_kill_timer(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
589/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 * proc.c
591 */
592extern int afs_proc_init(void);
593extern void afs_proc_cleanup(void);
David Howellsec268152007-04-26 15:49:28 -0700594extern int afs_proc_cell_setup(struct afs_cell *);
595extern void afs_proc_cell_remove(struct afs_cell *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
David Howells08e0e7c2007-04-26 15:55:03 -0700597/*
598 * rxrpc.c
599 */
600extern int afs_open_socket(void);
601extern void afs_close_socket(void);
602extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
603 const struct afs_wait_mode *);
604extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
605 size_t, size_t);
606extern void afs_flat_call_destructor(struct afs_call *);
607extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
608extern void afs_send_empty_reply(struct afs_call *);
David Howellsb908fe62007-04-26 15:58:17 -0700609extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
David Howells08e0e7c2007-04-26 15:55:03 -0700610extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
611 size_t);
612
613/*
David Howells00d3b7a2007-04-26 15:57:07 -0700614 * security.c
615 */
616extern void afs_clear_permits(struct afs_vnode *);
617extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
David Howells416351f2007-05-09 02:33:45 -0700618extern void afs_zap_permits(struct rcu_head *);
David Howells00d3b7a2007-04-26 15:57:07 -0700619extern struct key *afs_request_key(struct afs_cell *);
Al Viroe6305c42008-07-15 21:03:57 -0400620extern int afs_permission(struct inode *, int);
David Howells00d3b7a2007-04-26 15:57:07 -0700621
622/*
David Howells08e0e7c2007-04-26 15:55:03 -0700623 * server.c
624 */
625extern spinlock_t afs_server_peer_lock;
626
David Howells260a9802007-04-26 15:59:35 -0700627#define afs_get_server(S) \
628do { \
629 _debug("GET SERVER %d", atomic_read(&(S)->usage)); \
630 atomic_inc(&(S)->usage); \
631} while(0)
David Howells08e0e7c2007-04-26 15:55:03 -0700632
633extern struct afs_server *afs_lookup_server(struct afs_cell *,
634 const struct in_addr *);
635extern struct afs_server *afs_find_server(const struct in_addr *);
636extern void afs_put_server(struct afs_server *);
637extern void __exit afs_purge_servers(void);
638
639/*
David Howells00d3b7a2007-04-26 15:57:07 -0700640 * super.c
641 */
642extern int afs_fs_init(void);
643extern void afs_fs_exit(void);
644
645/*
David Howellsb908fe62007-04-26 15:58:17 -0700646 * use-rtnetlink.c
647 */
648extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
David Howellsec9c9482007-05-03 03:29:41 -0700649extern int afs_get_MAC_address(u8 *, size_t);
David Howellsb908fe62007-04-26 15:58:17 -0700650
651/*
David Howells08e0e7c2007-04-26 15:55:03 -0700652 * vlclient.c
653 */
David Howells00d3b7a2007-04-26 15:57:07 -0700654extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
655 const char *, struct afs_cache_vlocation *,
David Howells08e0e7c2007-04-26 15:55:03 -0700656 const struct afs_wait_mode *);
David Howells00d3b7a2007-04-26 15:57:07 -0700657extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
658 afs_volid_t, afs_voltype_t,
David Howells08e0e7c2007-04-26 15:55:03 -0700659 struct afs_cache_vlocation *,
660 const struct afs_wait_mode *);
661
662/*
663 * vlocation.c
664 */
665#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
666
667extern int __init afs_vlocation_update_init(void);
668extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
David Howells00d3b7a2007-04-26 15:57:07 -0700669 struct key *,
David Howells08e0e7c2007-04-26 15:55:03 -0700670 const char *, size_t);
671extern void afs_put_vlocation(struct afs_vlocation *);
David Howellsfbb3fcb2007-05-03 03:12:46 -0700672extern void afs_vlocation_purge(void);
David Howells08e0e7c2007-04-26 15:55:03 -0700673
674/*
675 * vnode.c
676 */
David Howells08e0e7c2007-04-26 15:55:03 -0700677static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
678{
679 return container_of(inode, struct afs_vnode, vfs_inode);
680}
681
682static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
683{
684 return &vnode->vfs_inode;
685}
686
David Howells260a9802007-04-26 15:59:35 -0700687extern void afs_vnode_finalise_status_update(struct afs_vnode *,
688 struct afs_server *);
David Howells00d3b7a2007-04-26 15:57:07 -0700689extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
690 struct key *);
691extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
692 off_t, size_t, struct page *);
David Howells260a9802007-04-26 15:59:35 -0700693extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
694 umode_t, struct afs_fid *, struct afs_file_status *,
695 struct afs_callback *, struct afs_server **);
696extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
697 bool);
698extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
699 const char *);
700extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
701 const char *, struct afs_fid *,
702 struct afs_file_status *, struct afs_server **);
703extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
704 struct key *, const char *, const char *);
David Howells31143d52007-05-09 02:33:46 -0700705extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
706 unsigned, unsigned);
707extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
David Howells45222b92007-05-10 22:22:20 -0700708extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
709 struct afs_volume_status *);
David Howellse8d6c552007-07-15 23:40:12 -0700710extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
711 afs_lock_type_t);
712extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
713extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
David Howells08e0e7c2007-04-26 15:55:03 -0700714
715/*
716 * volume.c
717 */
David Howells08e0e7c2007-04-26 15:55:03 -0700718#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
719
720extern void afs_put_volume(struct afs_volume *);
David Howells00d3b7a2007-04-26 15:57:07 -0700721extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
David Howells08e0e7c2007-04-26 15:55:03 -0700722extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
723extern int afs_volume_release_fileserver(struct afs_vnode *,
724 struct afs_server *, int);
725
David Howells31143d52007-05-09 02:33:46 -0700726/*
727 * write.c
728 */
729extern int afs_set_page_dirty(struct page *);
730extern void afs_put_writeback(struct afs_writeback *);
Nick Piggin15b46502008-10-15 22:04:32 -0700731extern int afs_write_begin(struct file *file, struct address_space *mapping,
732 loff_t pos, unsigned len, unsigned flags,
733 struct page **pagep, void **fsdata);
734extern int afs_write_end(struct file *file, struct address_space *mapping,
735 loff_t pos, unsigned len, unsigned copied,
736 struct page *page, void *fsdata);
David Howells31143d52007-05-09 02:33:46 -0700737extern int afs_writepage(struct page *, struct writeback_control *);
738extern int afs_writepages(struct address_space *, struct writeback_control *);
David Howells31143d52007-05-09 02:33:46 -0700739extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
740extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
741 unsigned long, loff_t);
742extern int afs_writeback_all(struct afs_vnode *);
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200743extern int afs_fsync(struct file *, int);
David Howells31143d52007-05-09 02:33:46 -0700744
745
David Howells08e0e7c2007-04-26 15:55:03 -0700746/*****************************************************************************/
747/*
748 * debug tracing
749 */
750extern unsigned afs_debug;
751
752#define dbgprintk(FMT,...) \
Sven Schnellead16df82008-04-03 10:44:01 +0100753 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
David Howells08e0e7c2007-04-26 15:55:03 -0700754
Harvey Harrison530b6412008-04-30 00:55:09 -0700755#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
756#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
David Howells08e0e7c2007-04-26 15:55:03 -0700757#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
758
759
760#if defined(__KDEBUG)
761#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
762#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
763#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
764
765#elif defined(CONFIG_AFS_DEBUG)
766#define AFS_DEBUG_KENTER 0x01
767#define AFS_DEBUG_KLEAVE 0x02
768#define AFS_DEBUG_KDEBUG 0x04
769
770#define _enter(FMT,...) \
771do { \
772 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
773 kenter(FMT,##__VA_ARGS__); \
774} while (0)
775
776#define _leave(FMT,...) \
777do { \
778 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
779 kleave(FMT,##__VA_ARGS__); \
780} while (0)
781
782#define _debug(FMT,...) \
783do { \
784 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
785 kdebug(FMT,##__VA_ARGS__); \
786} while (0)
787
788#else
David Howells12fdff32010-08-12 16:54:57 +0100789#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
790#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
791#define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
David Howells08e0e7c2007-04-26 15:55:03 -0700792#endif
793
794/*
795 * debug assertion checking
796 */
797#if 1 // defined(__KDEBUGALL)
798
799#define ASSERT(X) \
800do { \
801 if (unlikely(!(X))) { \
802 printk(KERN_ERR "\n"); \
803 printk(KERN_ERR "AFS: Assertion failed\n"); \
804 BUG(); \
805 } \
806} while(0)
807
808#define ASSERTCMP(X, OP, Y) \
809do { \
810 if (unlikely(!((X) OP (Y)))) { \
811 printk(KERN_ERR "\n"); \
812 printk(KERN_ERR "AFS: Assertion failed\n"); \
813 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
814 (unsigned long)(X), (unsigned long)(Y)); \
815 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
816 (unsigned long)(X), (unsigned long)(Y)); \
817 BUG(); \
818 } \
819} while(0)
820
David Howells416351f2007-05-09 02:33:45 -0700821#define ASSERTRANGE(L, OP1, N, OP2, H) \
822do { \
823 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
824 printk(KERN_ERR "\n"); \
825 printk(KERN_ERR "AFS: Assertion failed\n"); \
826 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
827 (unsigned long)(L), (unsigned long)(N), \
828 (unsigned long)(H)); \
829 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
830 (unsigned long)(L), (unsigned long)(N), \
831 (unsigned long)(H)); \
832 BUG(); \
833 } \
834} while(0)
835
David Howells08e0e7c2007-04-26 15:55:03 -0700836#define ASSERTIF(C, X) \
837do { \
838 if (unlikely((C) && !(X))) { \
839 printk(KERN_ERR "\n"); \
840 printk(KERN_ERR "AFS: Assertion failed\n"); \
841 BUG(); \
842 } \
843} while(0)
844
845#define ASSERTIFCMP(C, X, OP, Y) \
846do { \
847 if (unlikely((C) && !((X) OP (Y)))) { \
848 printk(KERN_ERR "\n"); \
849 printk(KERN_ERR "AFS: Assertion failed\n"); \
850 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
851 (unsigned long)(X), (unsigned long)(Y)); \
852 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
853 (unsigned long)(X), (unsigned long)(Y)); \
854 BUG(); \
855 } \
856} while(0)
857
858#else
859
860#define ASSERT(X) \
861do { \
862} while(0)
863
864#define ASSERTCMP(X, OP, Y) \
865do { \
866} while(0)
867
David Howells416351f2007-05-09 02:33:45 -0700868#define ASSERTRANGE(L, OP1, N, OP2, H) \
869do { \
870} while(0)
871
David Howells08e0e7c2007-04-26 15:55:03 -0700872#define ASSERTIF(C, X) \
873do { \
874} while(0)
875
876#define ASSERTIFCMP(C, X, OP, Y) \
877do { \
878} while(0)
879
880#endif /* __KDEBUGALL */