xref: /openbmc/linux/fs/afs/internal.h (revision 62e7ca52)
1 /* internal AFS stuff
2  *
3  * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 
12 #include <linux/compiler.h>
13 #include <linux/kernel.h>
14 #include <linux/fs.h>
15 #include <linux/pagemap.h>
16 #include <linux/skbuff.h>
17 #include <linux/rxrpc.h>
18 #include <linux/key.h>
19 #include <linux/workqueue.h>
20 #include <linux/sched.h>
21 #include <linux/fscache.h>
22 #include <linux/backing-dev.h>
23 
24 #include "afs.h"
25 #include "afs_vl.h"
26 
27 #define AFS_CELL_MAX_ADDRS 15
28 
29 struct pagevec;
30 struct afs_call;
31 
32 typedef enum {
33 	AFS_VL_NEW,			/* new, uninitialised record */
34 	AFS_VL_CREATING,		/* creating record */
35 	AFS_VL_VALID,			/* record is pending */
36 	AFS_VL_NO_VOLUME,		/* no such volume available */
37 	AFS_VL_UPDATING,		/* update in progress */
38 	AFS_VL_VOLUME_DELETED,		/* volume was deleted */
39 	AFS_VL_UNCERTAIN,		/* uncertain state (update failed) */
40 } __attribute__((packed)) afs_vlocation_state_t;
41 
42 struct afs_mount_params {
43 	bool			rwpath;		/* T if the parent should be considered R/W */
44 	bool			force;		/* T to force cell type */
45 	bool			autocell;	/* T if set auto mount operation */
46 	afs_voltype_t		type;		/* type of volume requested */
47 	int			volnamesz;	/* size of volume name */
48 	const char		*volname;	/* name of volume to mount */
49 	struct afs_cell		*cell;		/* cell in which to find volume */
50 	struct afs_volume	*volume;	/* volume record */
51 	struct key		*key;		/* key to use for secure mounting */
52 };
53 
54 /*
55  * definition of how to wait for the completion of an operation
56  */
57 struct afs_wait_mode {
58 	/* RxRPC received message notification */
59 	void (*rx_wakeup)(struct afs_call *call);
60 
61 	/* synchronous call waiter and call dispatched notification */
62 	int (*wait)(struct afs_call *call);
63 
64 	/* asynchronous call completion */
65 	void (*async_complete)(void *reply, int error);
66 };
67 
68 extern const struct afs_wait_mode afs_sync_call;
69 extern const struct afs_wait_mode afs_async_call;
70 
71 /*
72  * a record of an in-progress RxRPC call
73  */
74 struct afs_call {
75 	const struct afs_call_type *type;	/* type of call */
76 	const struct afs_wait_mode *wait_mode;	/* completion wait mode */
77 	wait_queue_head_t	waitq;		/* processes awaiting completion */
78 	void (*async_workfn)(struct afs_call *call); /* asynchronous work function */
79 	struct work_struct	async_work;	/* asynchronous work processor */
80 	struct work_struct	work;		/* actual work processor */
81 	struct sk_buff_head	rx_queue;	/* received packets */
82 	struct rxrpc_call	*rxcall;	/* RxRPC call handle */
83 	struct key		*key;		/* security for this call */
84 	struct afs_server	*server;	/* server affected by incoming CM call */
85 	void			*request;	/* request data (first part) */
86 	struct address_space	*mapping;	/* page set */
87 	struct afs_writeback	*wb;		/* writeback being performed */
88 	void			*buffer;	/* reply receive buffer */
89 	void			*reply;		/* reply buffer (first part) */
90 	void			*reply2;	/* reply buffer (second part) */
91 	void			*reply3;	/* reply buffer (third part) */
92 	void			*reply4;	/* reply buffer (fourth part) */
93 	pgoff_t			first;		/* first page in mapping to deal with */
94 	pgoff_t			last;		/* last page in mapping to deal with */
95 	enum {					/* call state */
96 		AFS_CALL_REQUESTING,	/* request is being sent for outgoing call */
97 		AFS_CALL_AWAIT_REPLY,	/* awaiting reply to outgoing call */
98 		AFS_CALL_AWAIT_OP_ID,	/* awaiting op ID on incoming call */
99 		AFS_CALL_AWAIT_REQUEST,	/* awaiting request data on incoming call */
100 		AFS_CALL_REPLYING,	/* replying to incoming call */
101 		AFS_CALL_AWAIT_ACK,	/* awaiting final ACK of incoming call */
102 		AFS_CALL_COMPLETE,	/* successfully completed */
103 		AFS_CALL_BUSY,		/* server was busy */
104 		AFS_CALL_ABORTED,	/* call was aborted */
105 		AFS_CALL_ERROR,		/* call failed due to error */
106 	}			state;
107 	int			error;		/* error code */
108 	unsigned		request_size;	/* size of request data */
109 	unsigned		reply_max;	/* maximum size of reply */
110 	unsigned		reply_size;	/* current size of reply */
111 	unsigned		first_offset;	/* offset into mapping[first] */
112 	unsigned		last_to;	/* amount of mapping[last] */
113 	unsigned		offset;		/* offset into received data store */
114 	unsigned char		unmarshall;	/* unmarshalling phase */
115 	bool			incoming;	/* T if incoming call */
116 	bool			send_pages;	/* T if data from mapping should be sent */
117 	u16			service_id;	/* RxRPC service ID to call */
118 	__be16			port;		/* target UDP port */
119 	__be32			operation_ID;	/* operation ID for an incoming call */
120 	u32			count;		/* count for use in unmarshalling */
121 	__be32			tmp;		/* place to extract temporary data */
122 	afs_dataversion_t	store_version;	/* updated version expected from store */
123 };
124 
125 struct afs_call_type {
126 	const char *name;
127 
128 	/* deliver request or reply data to an call
129 	 * - returning an error will cause the call to be aborted
130 	 */
131 	int (*deliver)(struct afs_call *call, struct sk_buff *skb,
132 		       bool last);
133 
134 	/* map an abort code to an error number */
135 	int (*abort_to_error)(u32 abort_code);
136 
137 	/* clean up a call */
138 	void (*destructor)(struct afs_call *call);
139 };
140 
141 /*
142  * record of an outstanding writeback on a vnode
143  */
144 struct afs_writeback {
145 	struct list_head	link;		/* link in vnode->writebacks */
146 	struct work_struct	writer;		/* work item to perform the writeback */
147 	struct afs_vnode	*vnode;		/* vnode to which this write applies */
148 	struct key		*key;		/* owner of this write */
149 	wait_queue_head_t	waitq;		/* completion and ready wait queue */
150 	pgoff_t			first;		/* first page in batch */
151 	pgoff_t			point;		/* last page in current store op */
152 	pgoff_t			last;		/* last page in batch (inclusive) */
153 	unsigned		offset_first;	/* offset into first page of start of write */
154 	unsigned		to_last;	/* offset into last page of end of write */
155 	int			num_conflicts;	/* count of conflicting writes in list */
156 	int			usage;
157 	bool			conflicts;	/* T if has dependent conflicts */
158 	enum {
159 		AFS_WBACK_SYNCING,		/* synchronisation being performed */
160 		AFS_WBACK_PENDING,		/* write pending */
161 		AFS_WBACK_CONFLICTING,		/* conflicting writes posted */
162 		AFS_WBACK_WRITING,		/* writing back */
163 		AFS_WBACK_COMPLETE		/* the writeback record has been unlinked */
164 	} state __attribute__((packed));
165 };
166 
167 /*
168  * AFS superblock private data
169  * - there's one superblock per volume
170  */
171 struct afs_super_info {
172 	struct afs_volume	*volume;	/* volume record */
173 	char			rwparent;	/* T if parent is R/W AFS volume */
174 };
175 
176 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
177 {
178 	return sb->s_fs_info;
179 }
180 
181 extern struct file_system_type afs_fs_type;
182 
183 /*
184  * entry in the cached cell catalogue
185  */
186 struct afs_cache_cell {
187 	char		name[AFS_MAXCELLNAME];	/* cell name (padded with NULs) */
188 	struct in_addr	vl_servers[15];		/* cached cell VL servers */
189 };
190 
191 /*
192  * AFS cell record
193  */
194 struct afs_cell {
195 	atomic_t		usage;
196 	struct list_head	link;		/* main cell list link */
197 	struct key		*anonymous_key;	/* anonymous user key for this cell */
198 	struct list_head	proc_link;	/* /proc cell list link */
199 #ifdef CONFIG_AFS_FSCACHE
200 	struct fscache_cookie	*cache;		/* caching cookie */
201 #endif
202 
203 	/* server record management */
204 	rwlock_t		servers_lock;	/* active server list lock */
205 	struct list_head	servers;	/* active server list */
206 
207 	/* volume location record management */
208 	struct rw_semaphore	vl_sem;		/* volume management serialisation semaphore */
209 	struct list_head	vl_list;	/* cell's active VL record list */
210 	spinlock_t		vl_lock;	/* vl_list lock */
211 	unsigned short		vl_naddrs;	/* number of VL servers in addr list */
212 	unsigned short		vl_curr_svix;	/* current server index */
213 	struct in_addr		vl_addrs[AFS_CELL_MAX_ADDRS];	/* cell VL server addresses */
214 
215 	char			name[0];	/* cell name - must go last */
216 };
217 
218 /*
219  * entry in the cached volume location catalogue
220  */
221 struct afs_cache_vlocation {
222 	/* volume name (lowercase, padded with NULs) */
223 	uint8_t			name[AFS_MAXVOLNAME + 1];
224 
225 	uint8_t			nservers;	/* number of entries used in servers[] */
226 	uint8_t			vidmask;	/* voltype mask for vid[] */
227 	uint8_t			srvtmask[8];	/* voltype masks for servers[] */
228 #define AFS_VOL_VTM_RW	0x01 /* R/W version of the volume is available (on this server) */
229 #define AFS_VOL_VTM_RO	0x02 /* R/O version of the volume is available (on this server) */
230 #define AFS_VOL_VTM_BAK	0x04 /* backup version of the volume is available (on this server) */
231 
232 	afs_volid_t		vid[3];		/* volume IDs for R/W, R/O and Bak volumes */
233 	struct in_addr		servers[8];	/* fileserver addresses */
234 	time_t			rtime;		/* last retrieval time */
235 };
236 
237 /*
238  * volume -> vnode hash table entry
239  */
240 struct afs_cache_vhash {
241 	afs_voltype_t		vtype;		/* which volume variation */
242 	uint8_t			hash_bucket;	/* which hash bucket this represents */
243 } __attribute__((packed));
244 
245 /*
246  * AFS volume location record
247  */
248 struct afs_vlocation {
249 	atomic_t		usage;
250 	time_t			time_of_death;	/* time at which put reduced usage to 0 */
251 	struct list_head	link;		/* link in cell volume location list */
252 	struct list_head	grave;		/* link in master graveyard list */
253 	struct list_head	update;		/* link in master update list */
254 	struct afs_cell		*cell;		/* cell to which volume belongs */
255 #ifdef CONFIG_AFS_FSCACHE
256 	struct fscache_cookie	*cache;		/* caching cookie */
257 #endif
258 	struct afs_cache_vlocation vldb;	/* volume information DB record */
259 	struct afs_volume	*vols[3];	/* volume access record pointer (index by type) */
260 	wait_queue_head_t	waitq;		/* status change waitqueue */
261 	time_t			update_at;	/* time at which record should be updated */
262 	spinlock_t		lock;		/* access lock */
263 	afs_vlocation_state_t	state;		/* volume location state */
264 	unsigned short		upd_rej_cnt;	/* ENOMEDIUM count during update */
265 	unsigned short		upd_busy_cnt;	/* EBUSY count during update */
266 	bool			valid;		/* T if valid */
267 };
268 
269 /*
270  * AFS fileserver record
271  */
272 struct afs_server {
273 	atomic_t		usage;
274 	time_t			time_of_death;	/* time at which put reduced usage to 0 */
275 	struct in_addr		addr;		/* server address */
276 	struct afs_cell		*cell;		/* cell in which server resides */
277 	struct list_head	link;		/* link in cell's server list */
278 	struct list_head	grave;		/* link in master graveyard list */
279 	struct rb_node		master_rb;	/* link in master by-addr tree */
280 	struct rw_semaphore	sem;		/* access lock */
281 
282 	/* file service access */
283 	struct rb_root		fs_vnodes;	/* vnodes backed by this server (ordered by FID) */
284 	unsigned long		fs_act_jif;	/* time at which last activity occurred */
285 	unsigned long		fs_dead_jif;	/* time at which no longer to be considered dead */
286 	spinlock_t		fs_lock;	/* access lock */
287 	int			fs_state;      	/* 0 or reason FS currently marked dead (-errno) */
288 
289 	/* callback promise management */
290 	struct rb_root		cb_promises;	/* vnode expiration list (ordered earliest first) */
291 	struct delayed_work	cb_updater;	/* callback updater */
292 	struct delayed_work	cb_break_work;	/* collected break dispatcher */
293 	wait_queue_head_t	cb_break_waitq;	/* space available in cb_break waitqueue */
294 	spinlock_t		cb_lock;	/* access lock */
295 	struct afs_callback	cb_break[64];	/* ring of callbacks awaiting breaking */
296 	atomic_t		cb_break_n;	/* number of pending breaks */
297 	u8			cb_break_head;	/* head of callback breaking ring */
298 	u8			cb_break_tail;	/* tail of callback breaking ring */
299 };
300 
301 /*
302  * AFS volume access record
303  */
304 struct afs_volume {
305 	atomic_t		usage;
306 	struct afs_cell		*cell;		/* cell to which belongs (unrefd ptr) */
307 	struct afs_vlocation	*vlocation;	/* volume location */
308 #ifdef CONFIG_AFS_FSCACHE
309 	struct fscache_cookie	*cache;		/* caching cookie */
310 #endif
311 	afs_volid_t		vid;		/* volume ID */
312 	afs_voltype_t		type;		/* type of volume */
313 	char			type_force;	/* force volume type (suppress R/O -> R/W) */
314 	unsigned short		nservers;	/* number of server slots filled */
315 	unsigned short		rjservers;	/* number of servers discarded due to -ENOMEDIUM */
316 	struct afs_server	*servers[8];	/* servers on which volume resides (ordered) */
317 	struct rw_semaphore	server_sem;	/* lock for accessing current server */
318 	struct backing_dev_info	bdi;
319 };
320 
321 /*
322  * vnode catalogue entry
323  */
324 struct afs_cache_vnode {
325 	afs_vnodeid_t		vnode_id;	/* vnode ID */
326 	unsigned		vnode_unique;	/* vnode ID uniquifier */
327 	afs_dataversion_t	data_version;	/* data version */
328 };
329 
330 /*
331  * AFS inode private data
332  */
333 struct afs_vnode {
334 	struct inode		vfs_inode;	/* the VFS's inode record */
335 
336 	struct afs_volume	*volume;	/* volume on which vnode resides */
337 	struct afs_server	*server;	/* server currently supplying this file */
338 	struct afs_fid		fid;		/* the file identifier for this inode */
339 	struct afs_file_status	status;		/* AFS status info for this file */
340 #ifdef CONFIG_AFS_FSCACHE
341 	struct fscache_cookie	*cache;		/* caching cookie */
342 #endif
343 	struct afs_permits	*permits;	/* cache of permits so far obtained */
344 	struct mutex		permits_lock;	/* lock for altering permits list */
345 	struct mutex		validate_lock;	/* lock for validating this vnode */
346 	wait_queue_head_t	update_waitq;	/* status fetch waitqueue */
347 	int			update_cnt;	/* number of outstanding ops that will update the
348 						 * status */
349 	spinlock_t		writeback_lock;	/* lock for writebacks */
350 	spinlock_t		lock;		/* waitqueue/flags lock */
351 	unsigned long		flags;
352 #define AFS_VNODE_CB_BROKEN	0		/* set if vnode's callback was broken */
353 #define AFS_VNODE_UNSET		1		/* set if vnode attributes not yet set */
354 #define AFS_VNODE_MODIFIED	2		/* set if vnode's data modified */
355 #define AFS_VNODE_ZAP_DATA	3		/* set if vnode's data should be invalidated */
356 #define AFS_VNODE_DELETED	4		/* set if vnode deleted on server */
357 #define AFS_VNODE_MOUNTPOINT	5		/* set if vnode is a mountpoint symlink */
358 #define AFS_VNODE_LOCKING	6		/* set if waiting for lock on vnode */
359 #define AFS_VNODE_READLOCKED	7		/* set if vnode is read-locked on the server */
360 #define AFS_VNODE_WRITELOCKED	8		/* set if vnode is write-locked on the server */
361 #define AFS_VNODE_UNLOCKING	9		/* set if vnode is being unlocked on the server */
362 #define AFS_VNODE_AUTOCELL	10		/* set if Vnode is an auto mount point */
363 #define AFS_VNODE_PSEUDODIR	11		/* set if Vnode is a pseudo directory */
364 
365 	long			acl_order;	/* ACL check count (callback break count) */
366 
367 	struct list_head	writebacks;	/* alterations in pagecache that need writing */
368 	struct list_head	pending_locks;	/* locks waiting to be granted */
369 	struct list_head	granted_locks;	/* locks granted on this file */
370 	struct delayed_work	lock_work;	/* work to be done in locking */
371 	struct key		*unlock_key;	/* key to be used in unlocking */
372 
373 	/* outstanding callback notification on this file */
374 	struct rb_node		server_rb;	/* link in server->fs_vnodes */
375 	struct rb_node		cb_promise;	/* link in server->cb_promises */
376 	struct work_struct	cb_broken_work;	/* work to be done on callback break */
377 	time_t			cb_expires;	/* time at which callback expires */
378 	time_t			cb_expires_at;	/* time used to order cb_promise */
379 	unsigned		cb_version;	/* callback version */
380 	unsigned		cb_expiry;	/* callback expiry time */
381 	afs_callback_type_t	cb_type;	/* type of callback */
382 	bool			cb_promised;	/* true if promise still holds */
383 };
384 
385 /*
386  * cached security record for one user's attempt to access a vnode
387  */
388 struct afs_permit {
389 	struct key		*key;		/* RxRPC ticket holding a security context */
390 	afs_access_t		access_mask;	/* access mask for this key */
391 };
392 
393 /*
394  * cache of security records from attempts to access a vnode
395  */
396 struct afs_permits {
397 	struct rcu_head		rcu;		/* disposal procedure */
398 	int			count;		/* number of records */
399 	struct afs_permit	permits[0];	/* the permits so far examined */
400 };
401 
402 /*
403  * record of one of a system's set of network interfaces
404  */
405 struct afs_interface {
406 	struct in_addr	address;	/* IPv4 address bound to interface */
407 	struct in_addr	netmask;	/* netmask applied to address */
408 	unsigned	mtu;		/* MTU of interface */
409 };
410 
411 /*
412  * UUID definition [internet draft]
413  * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
414  *   increments since midnight 15th October 1582
415  *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
416  *     time
417  * - the clock sequence is a 14-bit counter to avoid duplicate times
418  */
419 struct afs_uuid {
420 	u32		time_low;			/* low part of timestamp */
421 	u16		time_mid;			/* mid part of timestamp */
422 	u16		time_hi_and_version;		/* high part of timestamp and version  */
423 #define AFS_UUID_TO_UNIX_TIME	0x01b21dd213814000ULL
424 #define AFS_UUID_TIMEHI_MASK	0x0fff
425 #define AFS_UUID_VERSION_TIME	0x1000	/* time-based UUID */
426 #define AFS_UUID_VERSION_NAME	0x3000	/* name-based UUID */
427 #define AFS_UUID_VERSION_RANDOM	0x4000	/* (pseudo-)random generated UUID */
428 	u8		clock_seq_hi_and_reserved;	/* clock seq hi and variant */
429 #define AFS_UUID_CLOCKHI_MASK	0x3f
430 #define AFS_UUID_VARIANT_STD	0x80
431 	u8		clock_seq_low;			/* clock seq low */
432 	u8		node[6];			/* spatially unique node ID (MAC addr) */
433 };
434 
435 /*****************************************************************************/
436 /*
437  * cache.c
438  */
439 #ifdef CONFIG_AFS_FSCACHE
440 extern struct fscache_netfs afs_cache_netfs;
441 extern struct fscache_cookie_def afs_cell_cache_index_def;
442 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
443 extern struct fscache_cookie_def afs_volume_cache_index_def;
444 extern struct fscache_cookie_def afs_vnode_cache_index_def;
445 #else
446 #define afs_cell_cache_index_def	(*(struct fscache_cookie_def *) NULL)
447 #define afs_vlocation_cache_index_def	(*(struct fscache_cookie_def *) NULL)
448 #define afs_volume_cache_index_def	(*(struct fscache_cookie_def *) NULL)
449 #define afs_vnode_cache_index_def	(*(struct fscache_cookie_def *) NULL)
450 #endif
451 
452 /*
453  * callback.c
454  */
455 extern void afs_init_callback_state(struct afs_server *);
456 extern void afs_broken_callback_work(struct work_struct *);
457 extern void afs_break_callbacks(struct afs_server *, size_t,
458 				struct afs_callback[]);
459 extern void afs_discard_callback_on_delete(struct afs_vnode *);
460 extern void afs_give_up_callback(struct afs_vnode *);
461 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
462 extern void afs_flush_callback_breaks(struct afs_server *);
463 extern int __init afs_callback_update_init(void);
464 extern void afs_callback_update_kill(void);
465 
466 /*
467  * cell.c
468  */
469 extern struct rw_semaphore afs_proc_cells_sem;
470 extern struct list_head afs_proc_cells;
471 
472 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
473 extern int afs_cell_init(char *);
474 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool);
475 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool);
476 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
477 extern void afs_put_cell(struct afs_cell *);
478 extern void afs_cell_purge(void);
479 
480 /*
481  * cmservice.c
482  */
483 extern bool afs_cm_incoming_call(struct afs_call *);
484 
485 /*
486  * dir.c
487  */
488 extern const struct inode_operations afs_dir_inode_operations;
489 extern const struct dentry_operations afs_fs_dentry_operations;
490 extern const struct file_operations afs_dir_file_operations;
491 
492 /*
493  * file.c
494  */
495 extern const struct address_space_operations afs_fs_aops;
496 extern const struct inode_operations afs_file_inode_operations;
497 extern const struct file_operations afs_file_operations;
498 
499 extern int afs_open(struct inode *, struct file *);
500 extern int afs_release(struct inode *, struct file *);
501 extern int afs_page_filler(void *, struct page *);
502 
503 /*
504  * flock.c
505  */
506 extern void __exit afs_kill_lock_manager(void);
507 extern void afs_lock_work(struct work_struct *);
508 extern void afs_lock_may_be_available(struct afs_vnode *);
509 extern int afs_lock(struct file *, int, struct file_lock *);
510 extern int afs_flock(struct file *, int, struct file_lock *);
511 
512 /*
513  * fsclient.c
514  */
515 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
516 				    struct afs_vnode *, struct afs_volsync *,
517 				    const struct afs_wait_mode *);
518 extern int afs_fs_give_up_callbacks(struct afs_server *,
519 				    const struct afs_wait_mode *);
520 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
521 			     struct afs_vnode *, off_t, size_t, struct page *,
522 			     const struct afs_wait_mode *);
523 extern int afs_fs_create(struct afs_server *, struct key *,
524 			 struct afs_vnode *, const char *, umode_t,
525 			 struct afs_fid *, struct afs_file_status *,
526 			 struct afs_callback *,
527 			 const struct afs_wait_mode *);
528 extern int afs_fs_remove(struct afs_server *, struct key *,
529 			 struct afs_vnode *, const char *, bool,
530 			 const struct afs_wait_mode *);
531 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
532 		       struct afs_vnode *, const char *,
533 		       const struct afs_wait_mode *);
534 extern int afs_fs_symlink(struct afs_server *, struct key *,
535 			  struct afs_vnode *, const char *, const char *,
536 			  struct afs_fid *, struct afs_file_status *,
537 			  const struct afs_wait_mode *);
538 extern int afs_fs_rename(struct afs_server *, struct key *,
539 			 struct afs_vnode *, const char *,
540 			 struct afs_vnode *, const char *,
541 			 const struct afs_wait_mode *);
542 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
543 			     pgoff_t, pgoff_t, unsigned, unsigned,
544 			     const struct afs_wait_mode *);
545 extern int afs_fs_setattr(struct afs_server *, struct key *,
546 			  struct afs_vnode *, struct iattr *,
547 			  const struct afs_wait_mode *);
548 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
549 				    struct afs_vnode *,
550 				    struct afs_volume_status *,
551 				    const struct afs_wait_mode *);
552 extern int afs_fs_set_lock(struct afs_server *, struct key *,
553 			   struct afs_vnode *, afs_lock_type_t,
554 			   const struct afs_wait_mode *);
555 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
556 			      struct afs_vnode *,
557 			      const struct afs_wait_mode *);
558 extern int afs_fs_release_lock(struct afs_server *, struct key *,
559 			       struct afs_vnode *,
560 			       const struct afs_wait_mode *);
561 
562 /*
563  * inode.c
564  */
565 extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
566 				       struct key *);
567 extern struct inode *afs_iget(struct super_block *, struct key *,
568 			      struct afs_fid *, struct afs_file_status *,
569 			      struct afs_callback *);
570 extern void afs_zap_data(struct afs_vnode *);
571 extern int afs_validate(struct afs_vnode *, struct key *);
572 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
573 extern int afs_setattr(struct dentry *, struct iattr *);
574 extern void afs_evict_inode(struct inode *);
575 extern int afs_drop_inode(struct inode *);
576 
577 /*
578  * main.c
579  */
580 extern struct workqueue_struct *afs_wq;
581 extern struct afs_uuid afs_uuid;
582 
583 /*
584  * misc.c
585  */
586 extern int afs_abort_to_error(u32);
587 
588 /*
589  * mntpt.c
590  */
591 extern const struct inode_operations afs_mntpt_inode_operations;
592 extern const struct inode_operations afs_autocell_inode_operations;
593 extern const struct file_operations afs_mntpt_file_operations;
594 
595 extern struct vfsmount *afs_d_automount(struct path *);
596 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
597 extern void afs_mntpt_kill_timer(void);
598 
599 /*
600  * proc.c
601  */
602 extern int afs_proc_init(void);
603 extern void afs_proc_cleanup(void);
604 extern int afs_proc_cell_setup(struct afs_cell *);
605 extern void afs_proc_cell_remove(struct afs_cell *);
606 
607 /*
608  * rxrpc.c
609  */
610 extern int afs_open_socket(void);
611 extern void afs_close_socket(void);
612 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
613 			 const struct afs_wait_mode *);
614 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
615 					    size_t, size_t);
616 extern void afs_flat_call_destructor(struct afs_call *);
617 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
618 extern void afs_send_empty_reply(struct afs_call *);
619 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
620 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
621 			    size_t);
622 
623 /*
624  * security.c
625  */
626 extern void afs_clear_permits(struct afs_vnode *);
627 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
628 extern void afs_zap_permits(struct rcu_head *);
629 extern struct key *afs_request_key(struct afs_cell *);
630 extern int afs_permission(struct inode *, int);
631 
632 /*
633  * server.c
634  */
635 extern spinlock_t afs_server_peer_lock;
636 
637 #define afs_get_server(S)					\
638 do {								\
639 	_debug("GET SERVER %d", atomic_read(&(S)->usage));	\
640 	atomic_inc(&(S)->usage);				\
641 } while(0)
642 
643 extern struct afs_server *afs_lookup_server(struct afs_cell *,
644 					    const struct in_addr *);
645 extern struct afs_server *afs_find_server(const struct in_addr *);
646 extern void afs_put_server(struct afs_server *);
647 extern void __exit afs_purge_servers(void);
648 
649 /*
650  * super.c
651  */
652 extern int afs_fs_init(void);
653 extern void afs_fs_exit(void);
654 
655 /*
656  * use-rtnetlink.c
657  */
658 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
659 extern int afs_get_MAC_address(u8 *, size_t);
660 
661 /*
662  * vlclient.c
663  */
664 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
665 				    const char *, struct afs_cache_vlocation *,
666 				    const struct afs_wait_mode *);
667 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
668 				  afs_volid_t, afs_voltype_t,
669 				  struct afs_cache_vlocation *,
670 				  const struct afs_wait_mode *);
671 
672 /*
673  * vlocation.c
674  */
675 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
676 
677 extern int __init afs_vlocation_update_init(void);
678 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
679 						  struct key *,
680 						  const char *, size_t);
681 extern void afs_put_vlocation(struct afs_vlocation *);
682 extern void afs_vlocation_purge(void);
683 
684 /*
685  * vnode.c
686  */
687 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
688 {
689 	return container_of(inode, struct afs_vnode, vfs_inode);
690 }
691 
692 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
693 {
694 	return &vnode->vfs_inode;
695 }
696 
697 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
698 					     struct afs_server *);
699 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
700 				  struct key *);
701 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
702 				off_t, size_t, struct page *);
703 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
704 			    umode_t, struct afs_fid *, struct afs_file_status *,
705 			    struct afs_callback *, struct afs_server **);
706 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
707 			    bool);
708 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
709 			  const char *);
710 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
711 			     const char *, struct afs_fid *,
712 			     struct afs_file_status *, struct afs_server **);
713 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
714 			    struct key *, const char *, const char *);
715 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
716 				unsigned, unsigned);
717 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
718 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
719 				       struct afs_volume_status *);
720 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
721 			      afs_lock_type_t);
722 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
723 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
724 
725 /*
726  * volume.c
727  */
728 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
729 
730 extern void afs_put_volume(struct afs_volume *);
731 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
732 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
733 extern int afs_volume_release_fileserver(struct afs_vnode *,
734 					 struct afs_server *, int);
735 
736 /*
737  * write.c
738  */
739 extern int afs_set_page_dirty(struct page *);
740 extern void afs_put_writeback(struct afs_writeback *);
741 extern int afs_write_begin(struct file *file, struct address_space *mapping,
742 			loff_t pos, unsigned len, unsigned flags,
743 			struct page **pagep, void **fsdata);
744 extern int afs_write_end(struct file *file, struct address_space *mapping,
745 			loff_t pos, unsigned len, unsigned copied,
746 			struct page *page, void *fsdata);
747 extern int afs_writepage(struct page *, struct writeback_control *);
748 extern int afs_writepages(struct address_space *, struct writeback_control *);
749 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
750 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
751 extern int afs_writeback_all(struct afs_vnode *);
752 extern int afs_fsync(struct file *, loff_t, loff_t, int);
753 
754 
755 /*****************************************************************************/
756 /*
757  * debug tracing
758  */
759 extern unsigned afs_debug;
760 
761 #define dbgprintk(FMT,...) \
762 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
763 
764 #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
765 #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
766 #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
767 
768 
769 #if defined(__KDEBUG)
770 #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
771 #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
772 #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
773 
774 #elif defined(CONFIG_AFS_DEBUG)
775 #define AFS_DEBUG_KENTER	0x01
776 #define AFS_DEBUG_KLEAVE	0x02
777 #define AFS_DEBUG_KDEBUG	0x04
778 
779 #define _enter(FMT,...)					\
780 do {							\
781 	if (unlikely(afs_debug & AFS_DEBUG_KENTER))	\
782 		kenter(FMT,##__VA_ARGS__);		\
783 } while (0)
784 
785 #define _leave(FMT,...)					\
786 do {							\
787 	if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))	\
788 		kleave(FMT,##__VA_ARGS__);		\
789 } while (0)
790 
791 #define _debug(FMT,...)					\
792 do {							\
793 	if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))	\
794 		kdebug(FMT,##__VA_ARGS__);		\
795 } while (0)
796 
797 #else
798 #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
799 #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
800 #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
801 #endif
802 
803 /*
804  * debug assertion checking
805  */
806 #if 1 // defined(__KDEBUGALL)
807 
808 #define ASSERT(X)						\
809 do {								\
810 	if (unlikely(!(X))) {					\
811 		printk(KERN_ERR "\n");				\
812 		printk(KERN_ERR "AFS: Assertion failed\n");	\
813 		BUG();						\
814 	}							\
815 } while(0)
816 
817 #define ASSERTCMP(X, OP, Y)						\
818 do {									\
819 	if (unlikely(!((X) OP (Y)))) {					\
820 		printk(KERN_ERR "\n");					\
821 		printk(KERN_ERR "AFS: Assertion failed\n");		\
822 		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
823 		       (unsigned long)(X), (unsigned long)(Y));		\
824 		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
825 		       (unsigned long)(X), (unsigned long)(Y));		\
826 		BUG();							\
827 	}								\
828 } while(0)
829 
830 #define ASSERTRANGE(L, OP1, N, OP2, H)					\
831 do {									\
832 	if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {		\
833 		printk(KERN_ERR "\n");					\
834 		printk(KERN_ERR "AFS: Assertion failed\n");		\
835 		printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n",	\
836 		       (unsigned long)(L), (unsigned long)(N),		\
837 		       (unsigned long)(H));				\
838 		printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
839 		       (unsigned long)(L), (unsigned long)(N),		\
840 		       (unsigned long)(H));				\
841 		BUG();							\
842 	}								\
843 } while(0)
844 
845 #define ASSERTIF(C, X)						\
846 do {								\
847 	if (unlikely((C) && !(X))) {				\
848 		printk(KERN_ERR "\n");				\
849 		printk(KERN_ERR "AFS: Assertion failed\n");	\
850 		BUG();						\
851 	}							\
852 } while(0)
853 
854 #define ASSERTIFCMP(C, X, OP, Y)					\
855 do {									\
856 	if (unlikely((C) && !((X) OP (Y)))) {				\
857 		printk(KERN_ERR "\n");					\
858 		printk(KERN_ERR "AFS: Assertion failed\n");		\
859 		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
860 		       (unsigned long)(X), (unsigned long)(Y));		\
861 		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
862 		       (unsigned long)(X), (unsigned long)(Y));		\
863 		BUG();							\
864 	}								\
865 } while(0)
866 
867 #else
868 
869 #define ASSERT(X)				\
870 do {						\
871 } while(0)
872 
873 #define ASSERTCMP(X, OP, Y)			\
874 do {						\
875 } while(0)
876 
877 #define ASSERTRANGE(L, OP1, N, OP2, H)		\
878 do {						\
879 } while(0)
880 
881 #define ASSERTIF(C, X)				\
882 do {						\
883 } while(0)
884 
885 #define ASSERTIFCMP(C, X, OP, Y)		\
886 do {						\
887 } while(0)
888 
889 #endif /* __KDEBUGALL */
890