1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* internal AFS stuff
3 *
4 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/compiler.h>
9 #include <linux/kernel.h>
10 #include <linux/ktime.h>
11 #include <linux/fs.h>
12 #include <linux/filelock.h>
13 #include <linux/pagemap.h>
14 #include <linux/rxrpc.h>
15 #include <linux/key.h>
16 #include <linux/workqueue.h>
17 #include <linux/sched.h>
18 #include <linux/fscache.h>
19 #include <linux/backing-dev.h>
20 #include <linux/uuid.h>
21 #include <linux/mm_types.h>
22 #include <linux/dns_resolver.h>
23 #include <net/net_namespace.h>
24 #include <net/netns/generic.h>
25 #include <net/sock.h>
26 #include <net/af_rxrpc.h>
27
28 #include "afs.h"
29 #include "afs_vl.h"
30
31 #define AFS_CELL_MAX_ADDRS 15
32
33 struct pagevec;
34 struct afs_call;
35 struct afs_vnode;
36 struct afs_server_probe;
37
38 /*
39 * Partial file-locking emulation mode. (The problem being that AFS3 only
40 * allows whole-file locks and no upgrading/downgrading).
41 */
42 enum afs_flock_mode {
43 afs_flock_mode_unset,
44 afs_flock_mode_local, /* Local locking only */
45 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
46 afs_flock_mode_strict, /* Always get a server lock for a partial lock */
47 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
48 };
49
50 struct afs_fs_context {
51 bool force; /* T to force cell type */
52 bool autocell; /* T if set auto mount operation */
53 bool dyn_root; /* T if dynamic root */
54 bool no_cell; /* T if the source is "none" (for dynroot) */
55 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
56 afs_voltype_t type; /* type of volume requested */
57 unsigned int volnamesz; /* size of volume name */
58 const char *volname; /* name of volume to mount */
59 struct afs_net *net; /* the AFS net namespace stuff */
60 struct afs_cell *cell; /* cell in which to find volume */
61 struct afs_volume *volume; /* volume record */
62 struct key *key; /* key to use for secure mounting */
63 };
64
65 enum afs_call_state {
66 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
67 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
68 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
69 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
70 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
71 AFS_CALL_SV_REPLYING, /* Server: Replying */
72 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
73 AFS_CALL_COMPLETE, /* Completed or failed */
74 };
75
76 /*
77 * Address preferences.
78 */
79 struct afs_addr_preference {
80 union {
81 struct in_addr ipv4_addr; /* AF_INET address to compare against */
82 struct in6_addr ipv6_addr; /* AF_INET6 address to compare against */
83 };
84 sa_family_t family; /* Which address to use */
85 u16 prio; /* Priority */
86 u8 subnet_mask; /* How many bits to compare */
87 };
88
89 struct afs_addr_preference_list {
90 struct rcu_head rcu;
91 u16 version; /* Incremented when prefs list changes */
92 u8 ipv6_off; /* Offset of IPv6 addresses */
93 u8 nr; /* Number of addresses in total */
94 u8 max_prefs; /* Number of prefs allocated */
95 struct afs_addr_preference prefs[] __counted_by(max_prefs);
96 };
97
98 struct afs_address {
99 struct rxrpc_peer *peer;
100 short last_error; /* Last error from this address */
101 u16 prio; /* Address priority */
102 };
103
104 /*
105 * List of server addresses.
106 */
107 struct afs_addr_list {
108 struct rcu_head rcu;
109 refcount_t usage;
110 u32 version; /* Version */
111 unsigned int debug_id;
112 unsigned int addr_pref_version; /* Version of address preference list */
113 unsigned char max_addrs;
114 unsigned char nr_addrs;
115 unsigned char preferred; /* Preferred address */
116 unsigned char nr_ipv4; /* Number of IPv4 addresses */
117 enum dns_record_source source:8;
118 enum dns_lookup_status status:8;
119 unsigned long probe_failed; /* Mask of addrs that failed locally/ICMP */
120 unsigned long responded; /* Mask of addrs that responded */
121 struct afs_address addrs[] __counted_by(max_addrs);
122 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
123 };
124
125 /*
126 * a record of an in-progress RxRPC call
127 */
128 struct afs_call {
129 const struct afs_call_type *type; /* type of call */
130 wait_queue_head_t waitq; /* processes awaiting completion */
131 struct work_struct async_work; /* async I/O processor */
132 struct work_struct work; /* actual work processor */
133 struct work_struct free_work; /* Deferred free processor */
134 struct rxrpc_call *rxcall; /* RxRPC call handle */
135 struct rxrpc_peer *peer; /* Remote endpoint */
136 struct key *key; /* security for this call */
137 struct afs_net *net; /* The network namespace */
138 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
139 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
140 void *request; /* request data (first part) */
141 size_t iov_len; /* Size of *iter to be used */
142 struct iov_iter def_iter; /* Default buffer/data iterator */
143 struct iov_iter *write_iter; /* Iterator defining write to be made */
144 struct iov_iter *iter; /* Iterator currently in use */
145 union { /* Convenience for ->def_iter */
146 struct kvec kvec[1];
147 struct bio_vec bvec[1];
148 };
149 void *buffer; /* reply receive buffer */
150 union {
151 struct afs_endpoint_state *probe;
152 struct afs_addr_list *vl_probe;
153 struct afs_addr_list *ret_alist;
154 struct afs_vldb_entry *ret_vldb;
155 char *ret_str;
156 };
157 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */
158 unsigned char probe_index; /* Address in ->probe_alist */
159 struct afs_operation *op;
160 unsigned int server_index;
161 refcount_t ref;
162 enum afs_call_state state;
163 spinlock_t state_lock;
164 int error; /* error code */
165 u32 abort_code; /* Remote abort ID or 0 */
166 unsigned long long remaining; /* How much is left to receive */
167 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
168 unsigned request_size; /* size of request data */
169 unsigned reply_max; /* maximum size of reply */
170 unsigned count2; /* count used in unmarshalling */
171 unsigned char unmarshall; /* unmarshalling phase */
172 bool drop_ref; /* T if need to drop ref for incoming call */
173 bool need_attention; /* T if RxRPC poked us */
174 bool async; /* T if asynchronous */
175 bool upgrade; /* T to request service upgrade */
176 bool intr; /* T if interruptible */
177 bool unmarshalling_error; /* T if an unmarshalling error occurred */
178 bool responded; /* Got a response from the call (may be abort) */
179 u16 service_id; /* Actual service ID (after upgrade) */
180 unsigned int debug_id; /* Trace ID */
181 u32 operation_ID; /* operation ID for an incoming call */
182 u32 count; /* count for use in unmarshalling */
183 union { /* place to extract temporary data */
184 struct {
185 __be32 tmp_u;
186 __be32 tmp;
187 } __attribute__((packed));
188 __be64 tmp64;
189 };
190 ktime_t issue_time; /* Time of issue of operation */
191 };
192
193 struct afs_call_type {
194 const char *name;
195 unsigned int op; /* Really enum afs_fs_operation */
196
197 /* deliver request or reply data to an call
198 * - returning an error will cause the call to be aborted
199 */
200 int (*deliver)(struct afs_call *call);
201
202 /* clean up a call */
203 void (*destructor)(struct afs_call *call);
204
205 /* Async receive processing function */
206 void (*async_rx)(struct work_struct *work);
207
208 /* Work function */
209 void (*work)(struct work_struct *work);
210
211 /* Call done function (gets called immediately on success or failure) */
212 void (*done)(struct afs_call *call);
213
214 /* Handle a call being immediately cancelled. */
215 void (*immediate_cancel)(struct afs_call *call);
216 };
217
218 /*
219 * Key available for writeback on a file.
220 */
221 struct afs_wb_key {
222 refcount_t usage;
223 struct key *key;
224 struct list_head vnode_link; /* Link in vnode->wb_keys */
225 };
226
227 /*
228 * AFS open file information record. Pointed to by file->private_data.
229 */
230 struct afs_file {
231 struct key *key; /* The key this file was opened with */
232 struct afs_wb_key *wb; /* Writeback key record for this file */
233 };
234
afs_file_key(struct file * file)235 static inline struct key *afs_file_key(struct file *file)
236 {
237 struct afs_file *af = file->private_data;
238
239 return af->key;
240 }
241
242 /*
243 * AFS superblock private data
244 * - there's one superblock per volume
245 */
246 struct afs_super_info {
247 struct net *net_ns; /* Network namespace */
248 struct afs_cell *cell; /* The cell in which the volume resides */
249 struct afs_volume *volume; /* volume record */
250 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
251 bool dyn_root; /* True if dynamic root */
252 };
253
AFS_FS_S(struct super_block * sb)254 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
255 {
256 return sb->s_fs_info;
257 }
258
259 extern struct file_system_type afs_fs_type;
260
261 /*
262 * Set of substitutes for @sys.
263 */
264 struct afs_sysnames {
265 #define AFS_NR_SYSNAME 16
266 char *subs[AFS_NR_SYSNAME];
267 refcount_t usage;
268 unsigned short nr;
269 char blank[1];
270 };
271
272 /*
273 * AFS network namespace record.
274 */
275 struct afs_net {
276 struct net *net; /* Backpointer to the owning net namespace */
277 struct afs_uuid uuid;
278 bool live; /* F if this namespace is being removed */
279
280 /* AF_RXRPC I/O stuff */
281 struct socket *socket;
282 struct afs_call *spare_incoming_call;
283 struct work_struct charge_preallocation_work;
284 struct mutex socket_mutex;
285 atomic_t nr_outstanding_calls;
286 atomic_t nr_superblocks;
287
288 /* Cell database */
289 struct rb_root cells;
290 struct idr cells_dyn_ino; /* cell->dynroot_ino mapping */
291 struct afs_cell __rcu *ws_cell;
292 atomic_t cells_outstanding;
293 struct rw_semaphore cells_lock;
294 struct mutex cells_alias_lock;
295
296 struct mutex proc_cells_lock;
297 struct hlist_head proc_cells;
298
299 /* Known servers. Theoretically each fileserver can only be in one
300 * cell, but in practice, people create aliases and subsets and there's
301 * no easy way to distinguish them.
302 */
303 seqlock_t fs_lock; /* For fs_probe_*, fs_proc */
304 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
305 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
306 struct hlist_head fs_proc; /* procfs servers list */
307
308 struct work_struct fs_prober;
309 struct timer_list fs_probe_timer;
310 atomic_t servers_outstanding;
311
312 /* File locking renewal management */
313 struct mutex lock_manager_mutex;
314
315 /* Misc */
316 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
317 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
318 struct afs_sysnames *sysnames;
319 rwlock_t sysnames_lock;
320 struct afs_addr_preference_list __rcu *address_prefs;
321 u16 address_pref_version;
322
323 /* Statistics counters */
324 atomic_t n_lookup; /* Number of lookups done */
325 atomic_t n_reval; /* Number of dentries needing revalidation */
326 atomic_t n_inval; /* Number of invalidations by the server */
327 atomic_t n_relpg; /* Number of invalidations by release_folio */
328 atomic_t n_read_dir; /* Number of directory pages read */
329 atomic_t n_dir_cr; /* Number of directory entry creation edits */
330 atomic_t n_dir_rm; /* Number of directory entry removal edits */
331 atomic_t n_stores; /* Number of store ops */
332 atomic_long_t n_store_bytes; /* Number of bytes stored */
333 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
334 atomic_t n_fetches; /* Number of data fetch ops */
335 };
336
337 extern const char afs_init_sysname[];
338
339 enum afs_cell_state {
340 AFS_CELL_SETTING_UP,
341 AFS_CELL_ACTIVE,
342 AFS_CELL_REMOVING,
343 AFS_CELL_DEAD,
344 };
345
346 /*
347 * AFS cell record.
348 *
349 * This is a tricky concept to get right as it is possible to create aliases
350 * simply by pointing AFSDB/SRV records for two names at the same set of VL
351 * servers; it is also possible to do things like setting up two sets of VL
352 * servers, one of which provides a superset of the volumes provided by the
353 * other (for internal/external division, for example).
354 *
355 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
356 * servers and (b) a cell's name is used by the client to select the key to use
357 * for authentication and encryption. The cell name is not typically used in
358 * the protocol.
359 *
360 * Two cells are determined to be aliases if they have an explicit alias (YFS
361 * only), share any VL servers in common or have at least one volume in common.
362 * "In common" means that the address list of the VL servers or the fileservers
363 * share at least one endpoint.
364 */
365 struct afs_cell {
366 union {
367 struct rcu_head rcu;
368 struct rb_node net_node; /* Node in net->cells */
369 };
370 struct afs_net *net;
371 struct afs_cell *alias_of; /* The cell this is an alias of */
372 struct afs_volume *root_volume; /* The root.cell volume if there is one */
373 struct key *anonymous_key; /* anonymous user key for this cell */
374 struct work_struct destroyer; /* Destroyer for cell */
375 struct work_struct manager; /* Manager for init/deinit/dns */
376 struct timer_list management_timer; /* General management timer */
377 struct hlist_node proc_link; /* /proc cell list link */
378 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
379 time64_t last_inactive; /* Time of last drop of usage count */
380 refcount_t ref; /* Struct refcount */
381 atomic_t active; /* Active usage counter */
382 unsigned long flags;
383 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
384 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
385 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
386 enum afs_cell_state state;
387 short error;
388 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
389 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
390 unsigned int dns_lookup_count; /* Counter of DNS lookups */
391 unsigned int debug_id;
392 unsigned int dynroot_ino; /* Inode numbers for dynroot (a pair) */
393
394 /* The volumes belonging to this cell */
395 struct rw_semaphore vs_lock; /* Lock for server->volumes */
396 struct rb_root volumes; /* Tree of volumes on this server */
397 struct hlist_head proc_volumes; /* procfs volume list */
398 seqlock_t volume_lock; /* For volumes */
399
400 /* Active fileserver interaction state. */
401 struct rb_root fs_servers; /* afs_server (by server UUID) */
402 struct rw_semaphore fs_lock; /* For fs_servers */
403
404 /* VL server list. */
405 rwlock_t vl_servers_lock; /* Lock on vl_servers */
406 struct afs_vlserver_list __rcu *vl_servers;
407
408 u8 name_len; /* Length of name */
409 char *name; /* Cell name, case-flattened and NUL-padded */
410 };
411
412 /*
413 * Volume Location server record.
414 */
415 struct afs_vlserver {
416 struct rcu_head rcu;
417 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
418 unsigned long flags;
419 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
420 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
421 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
422 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
423 rwlock_t lock; /* Lock on addresses */
424 refcount_t ref;
425 unsigned int rtt; /* Server's current RTT in uS */
426 unsigned int debug_id;
427
428 /* Probe state */
429 wait_queue_head_t probe_wq;
430 atomic_t probe_outstanding;
431 spinlock_t probe_lock;
432 struct {
433 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
434 u32 abort_code;
435 short error;
436 unsigned short flags;
437 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
438 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
439 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
440 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
441 } probe;
442
443 u16 service_id; /* Service ID we're using */
444 u16 port;
445 u16 name_len; /* Length of name */
446 char name[]; /* Server name, case-flattened */
447 };
448
449 /*
450 * Weighted list of Volume Location servers.
451 */
452 struct afs_vlserver_entry {
453 u16 priority; /* Preference (as SRV) */
454 u16 weight; /* Weight (as SRV) */
455 enum dns_record_source source:8;
456 enum dns_lookup_status status:8;
457 struct afs_vlserver *server;
458 };
459
460 struct afs_vlserver_list {
461 struct rcu_head rcu;
462 refcount_t ref;
463 u8 nr_servers;
464 u8 index; /* Server currently in use */
465 u8 preferred; /* Preferred server */
466 enum dns_record_source source:8;
467 enum dns_lookup_status status:8;
468 rwlock_t lock;
469 struct afs_vlserver_entry servers[];
470 };
471
472 /*
473 * Cached VLDB entry.
474 *
475 * This is pointed to by cell->vldb_entries, indexed by name.
476 */
477 struct afs_vldb_entry {
478 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
479
480 unsigned long flags;
481 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
482 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
483 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
484 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
485 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
486
487 uuid_t fs_server[AFS_NMAXNSERVERS];
488 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
489 u8 fs_mask[AFS_NMAXNSERVERS];
490 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
491 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
492 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
493 u8 vlsf_flags[AFS_NMAXNSERVERS];
494 short error;
495 u8 nr_servers; /* Number of server records */
496 u8 name_len;
497 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
498 };
499
500 /*
501 * Fileserver endpoint state. The records the addresses of a fileserver's
502 * endpoints and the state and result of a round of probing on them. This
503 * allows the rotation algorithm to access those results without them being
504 * erased by a subsequent round of probing.
505 */
506 struct afs_endpoint_state {
507 struct rcu_head rcu;
508 struct afs_addr_list *addresses; /* The addresses being probed */
509 unsigned long responsive_set; /* Bitset of responsive endpoints */
510 unsigned long failed_set; /* Bitset of endpoints we failed to probe */
511 refcount_t ref;
512 unsigned int server_id; /* Debug ID of server */
513 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */
514 atomic_t nr_probing; /* Number of outstanding probes */
515 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
516 s32 abort_code;
517 short error;
518 unsigned long flags;
519 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */
520 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */
521 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */
522 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */
523 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */
524 };
525
526 /*
527 * Record of fileserver with which we're actively communicating.
528 */
529 struct afs_server {
530 struct rcu_head rcu;
531 union {
532 uuid_t uuid; /* Server ID */
533 struct afs_uuid _uuid;
534 };
535
536 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
537 struct rb_node uuid_rb; /* Link in cell->fs_servers */
538 struct list_head probe_link; /* Link in net->fs_probe_* */
539 struct hlist_node proc_link; /* Link in net->fs_proc */
540 struct list_head volumes; /* RCU list of afs_server_entry objects */
541 struct work_struct destroyer; /* Work item to try and destroy a server */
542 struct timer_list timer; /* Management timer */
543 time64_t unuse_time; /* Time at which last unused */
544 unsigned long flags;
545 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
546 #define AFS_SERVER_FL_UPDATING 1
547 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
548 #define AFS_SERVER_FL_UNCREATED 3 /* The record needs creating */
549 #define AFS_SERVER_FL_CREATING 4 /* The record is being created */
550 #define AFS_SERVER_FL_EXPIRED 5 /* The record has expired */
551 #define AFS_SERVER_FL_NOT_FOUND 6 /* VL server says no such server */
552 #define AFS_SERVER_FL_VL_FAIL 7 /* Failed to access VL server */
553 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
554 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
555 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
556 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
557 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
558 refcount_t ref; /* Object refcount */
559 atomic_t active; /* Active user count */
560 u32 addr_version; /* Address list version */
561 u16 service_id; /* Service ID we're using. */
562 short create_error; /* Creation error */
563 unsigned int rtt; /* Server's current RTT in uS */
564 unsigned int debug_id; /* Debugging ID for traces */
565
566 /* file service access */
567 rwlock_t fs_lock; /* access lock */
568
569 /* Probe state */
570 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
571 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
572 wait_queue_head_t probe_wq;
573 unsigned int probe_counter; /* Number of probes issued */
574 spinlock_t probe_lock;
575 };
576
577 enum afs_ro_replicating {
578 AFS_RO_NOT_REPLICATING, /* Not doing replication */
579 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */
580 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */
581 } __mode(byte);
582
583 /*
584 * Replaceable volume server list.
585 */
586 struct afs_server_entry {
587 struct afs_server *server;
588 struct afs_volume *volume;
589 struct list_head slink; /* Link in server->volumes */
590 time64_t cb_expires_at; /* Time at which volume-level callback expires */
591 unsigned long flags;
592 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */
593 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */
594 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */
595 };
596
597 struct afs_server_list {
598 struct rcu_head rcu;
599 refcount_t usage;
600 bool attached; /* T if attached to servers */
601 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */
602 unsigned char nr_servers;
603 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
604 unsigned int seq; /* Set to ->servers_seq when installed */
605 rwlock_t lock;
606 struct afs_server_entry servers[];
607 };
608
609 /*
610 * Live AFS volume management.
611 */
612 struct afs_volume {
613 struct rcu_head rcu;
614 afs_volid_t vid; /* The volume ID of this volume */
615 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
616 refcount_t ref;
617 unsigned int debug_id; /* Debugging ID for traces */
618 time64_t update_at; /* Time at which to next update */
619 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
620 struct rb_node cell_node; /* Link in cell->volumes */
621 struct hlist_node proc_link; /* Link in cell->proc_volumes */
622 struct super_block __rcu *sb; /* Superblock on which inodes reside */
623 struct work_struct destructor; /* Deferred destructor */
624 unsigned long flags;
625 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
626 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
627 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
628 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
629 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */
630 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */
631 #ifdef CONFIG_AFS_FSCACHE
632 struct fscache_volume *cache; /* Caching cookie */
633 #endif
634 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
635 rwlock_t servers_lock; /* Lock for ->servers */
636 unsigned int servers_seq; /* Incremented each time ->servers changes */
637
638 /* RO release tracking */
639 struct mutex volsync_lock; /* Time/state evaluation lock */
640 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */
641 time64_t update_time; /* Volume update time (or TIME64_MIN) */
642
643 /* Callback management */
644 struct mutex cb_check_lock; /* Lock to control race to check after v_break */
645 time64_t cb_expires_at; /* Earliest volume callback expiry time */
646 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */
647 atomic_t cb_v_break; /* Volume-break event counter. */
648 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */
649 atomic_t cb_scrub; /* Scrub-all-data event counter. */
650 rwlock_t cb_v_break_lock;
651 struct rw_semaphore open_mmaps_lock;
652 struct list_head open_mmaps; /* List of vnodes that are mmapped */
653
654 afs_voltype_t type; /* type of volume */
655 char type_force; /* force volume type (suppress R/O -> R/W) */
656 u8 name_len;
657 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
658 };
659
660 enum afs_lock_state {
661 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
662 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
663 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
664 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
665 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
666 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
667 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
668 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
669 };
670
671 /*
672 * AFS inode private data.
673 *
674 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
675 * leak from one inode to another.
676 */
677 struct afs_vnode {
678 struct netfs_inode netfs; /* Netfslib context and vfs inode */
679 struct afs_volume *volume; /* volume on which vnode resides */
680 struct afs_fid fid; /* the file identifier for this inode */
681 struct afs_file_status status; /* AFS status info for this file */
682 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
683 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
684 struct list_head io_lock_waiters; /* Threads waiting for the I/O lock */
685 struct rw_semaphore validate_lock; /* lock for validating this vnode */
686 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
687 struct key *silly_key; /* Silly rename key */
688 spinlock_t wb_lock; /* lock for wb_keys */
689 spinlock_t lock; /* waitqueue/flags lock */
690 unsigned long flags;
691 #define AFS_VNODE_IO_LOCK 0 /* Set if the I/O serialisation lock is held */
692 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
693 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
694 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
695 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
696 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
697 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
698 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
699 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
700 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
701 #define AFS_VNODE_DIR_READ 11 /* Set if we've read a dir's contents */
702
703 struct folio_queue *directory; /* Directory contents */
704 struct list_head wb_keys; /* List of keys available for writeback */
705 struct list_head pending_locks; /* locks waiting to be granted */
706 struct list_head granted_locks; /* locks granted on this file */
707 struct delayed_work lock_work; /* work to be done in locking */
708 struct key *lock_key; /* Key to be used in lock ops */
709 ktime_t locked_at; /* Time at which lock obtained */
710 enum afs_lock_state lock_state : 8;
711 afs_lock_type_t lock_type : 8;
712 unsigned int directory_size; /* Amount of space in ->directory */
713
714 /* outstanding callback notification on this file */
715 struct work_struct cb_work; /* Work for mmap'd files */
716 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
717 void *cb_server; /* Server with callback/filelock */
718 atomic_t cb_nr_mmap; /* Number of mmaps */
719 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */
720 unsigned int cb_scrub; /* Scrub counter on ->volume */
721 unsigned int cb_break; /* Break counter on vnode */
722 unsigned int cb_v_check; /* Break check counter on ->volume */
723 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
724
725 atomic64_t cb_expires_at; /* time at which callback expires */
726 #define AFS_NO_CB_PROMISE TIME64_MIN
727 };
728
afs_vnode_cache(struct afs_vnode * vnode)729 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
730 {
731 #ifdef CONFIG_AFS_FSCACHE
732 return netfs_i_cookie(&vnode->netfs);
733 #else
734 return NULL;
735 #endif
736 }
737
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)738 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
739 struct fscache_cookie *cookie)
740 {
741 #ifdef CONFIG_AFS_FSCACHE
742 vnode->netfs.cache = cookie;
743 if (cookie)
744 mapping_set_release_always(vnode->netfs.inode.i_mapping);
745 #endif
746 }
747
748 /*
749 * cached security record for one user's attempt to access a vnode
750 */
751 struct afs_permit {
752 struct key *key; /* RxRPC ticket holding a security context */
753 afs_access_t access; /* CallerAccess value for this key */
754 };
755
756 /*
757 * Immutable cache of CallerAccess records from attempts to access vnodes.
758 * These may be shared between multiple vnodes.
759 */
760 struct afs_permits {
761 struct rcu_head rcu;
762 struct hlist_node hash_node; /* Link in hash */
763 unsigned long h; /* Hash value for this permit list */
764 refcount_t usage;
765 unsigned short nr_permits; /* Number of records */
766 bool invalidated; /* Invalidated due to key change */
767 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
768 };
769
770 /*
771 * Error prioritisation and accumulation.
772 */
773 struct afs_error {
774 s32 abort_code; /* Cumulative abort code */
775 short error; /* Cumulative error */
776 bool responded; /* T if server responded */
777 bool aborted; /* T if ->error is from an abort */
778 };
779
780 /*
781 * Cursor for iterating over a set of volume location servers.
782 */
783 struct afs_vl_cursor {
784 struct afs_cell *cell; /* The cell we're querying */
785 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
786 struct afs_vlserver *server; /* Server on which this resides */
787 struct afs_addr_list *alist; /* Current address list (pins ref) */
788 struct key *key; /* Key for the server */
789 unsigned long untried_servers; /* Bitmask of untried servers */
790 unsigned long addr_tried; /* Tried addresses */
791 struct afs_error cumul_error; /* Cumulative error */
792 unsigned int debug_id;
793 s32 call_abort_code;
794 short call_error; /* Error from single call */
795 short server_index; /* Current server */
796 signed char addr_index; /* Current address */
797 unsigned short flags;
798 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
799 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
800 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
801 short nr_iterations; /* Number of server iterations */
802 bool call_responded; /* T if the current address responded */
803 };
804
805 /*
806 * Fileserver state tracking for an operation. An array of these is kept,
807 * indexed by server index.
808 */
809 struct afs_server_state {
810 /* Tracking of fileserver probe state. Other operations may interfere
811 * by probing a fileserver when accessing other volumes.
812 */
813 unsigned int probe_seq;
814 unsigned long untried_addrs; /* Addresses we haven't tried yet */
815 struct wait_queue_entry probe_waiter;
816 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
817 };
818
819 /*
820 * Fileserver operation methods.
821 */
822 struct afs_operation_ops {
823 void (*issue_afs_rpc)(struct afs_operation *op);
824 void (*issue_yfs_rpc)(struct afs_operation *op);
825 void (*success)(struct afs_operation *op);
826 void (*aborted)(struct afs_operation *op);
827 void (*failed)(struct afs_operation *op);
828 void (*edit_dir)(struct afs_operation *op);
829 void (*put)(struct afs_operation *op);
830 };
831
832 struct afs_vnode_param {
833 struct afs_vnode *vnode;
834 struct afs_fid fid; /* Fid to access */
835 struct afs_status_cb scb; /* Returned status and callback promise */
836 afs_dataversion_t dv_before; /* Data version before the call */
837 unsigned int cb_break_before; /* cb_break before the call */
838 u8 dv_delta; /* Expected change in data version */
839 bool put_vnode:1; /* T if we have a ref on the vnode */
840 bool need_io_lock:1; /* T if we need the I/O lock on this */
841 bool update_ctime:1; /* Need to update the ctime */
842 bool set_size:1; /* Must update i_size */
843 bool op_unlinked:1; /* True if file was unlinked by op */
844 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
845 bool modification:1; /* Set if the content gets modified */
846 };
847
848 /*
849 * Fileserver operation wrapper, handling server and address rotation
850 * asynchronously. May make simultaneous calls to multiple servers.
851 */
852 struct afs_operation {
853 struct afs_net *net; /* Network namespace */
854 struct key *key; /* Key for the cell */
855 const struct afs_call_type *type; /* Type of call done */
856 const struct afs_operation_ops *ops;
857
858 /* Parameters/results for the operation */
859 struct afs_volume *volume; /* Volume being accessed */
860 struct afs_vnode_param file[2];
861 struct afs_vnode_param *more_files;
862 struct afs_volsync pre_volsync; /* Volsync before op */
863 struct afs_volsync volsync; /* Volsync returned by op */
864 struct dentry *dentry; /* Dentry to be altered */
865 struct dentry *dentry_2; /* Second dentry to be altered */
866 struct timespec64 mtime; /* Modification time to record */
867 struct timespec64 ctime; /* Change time to set */
868 struct afs_error cumul_error; /* Cumulative error */
869 short nr_files; /* Number of entries in file[], more_files */
870 unsigned int debug_id;
871
872 unsigned int cb_v_break; /* Volume break counter before op */
873
874 union {
875 struct {
876 int which; /* Which ->file[] to fetch for */
877 } fetch_status;
878 struct {
879 int reason; /* enum afs_edit_dir_reason */
880 mode_t mode;
881 const char *symlink;
882 } create;
883 struct {
884 bool need_rehash;
885 } unlink;
886 struct {
887 struct dentry *rehash;
888 struct dentry *tmp;
889 bool new_negative;
890 } rename;
891 struct {
892 struct netfs_io_subrequest *subreq;
893 } fetch;
894 struct {
895 afs_lock_type_t type;
896 } lock;
897 struct {
898 struct iov_iter *write_iter;
899 loff_t pos;
900 loff_t size;
901 loff_t i_size;
902 } store;
903 struct {
904 struct iattr *attr;
905 loff_t old_i_size;
906 } setattr;
907 struct afs_acl *acl;
908 struct yfs_acl *yacl;
909 struct {
910 struct afs_volume_status vs;
911 struct kstatfs *buf;
912 } volstatus;
913 };
914
915 /* Fileserver iteration state */
916 struct afs_server_list *server_list; /* Current server list (pins ref) */
917 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
918 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */
919 struct afs_server_state *server_states; /* States of the servers involved */
920 struct afs_call *call;
921 unsigned long untried_servers; /* Bitmask of untried servers */
922 unsigned long addr_tried; /* Tried addresses */
923 s32 call_abort_code; /* Abort code from single call */
924 short call_error; /* Error from single call */
925 short server_index; /* Current server */
926 short nr_iterations; /* Number of server iterations */
927 signed char addr_index; /* Current address */
928 bool call_responded; /* T if the current address responded */
929
930 unsigned int flags;
931 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
932 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
933 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
934 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
935 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
936 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
937 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
938 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
939 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
940 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
941 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
942 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
943 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
944 #define AFS_OPERATION_ASYNC 0x2000 /* Set if should run asynchronously */
945 };
946
947 /*
948 * Cache auxiliary data.
949 */
950 struct afs_vnode_cache_aux {
951 __be64 data_version;
952 } __packed;
953
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)954 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
955 struct afs_vnode_cache_aux *aux)
956 {
957 aux->data_version = cpu_to_be64(vnode->status.data_version);
958 }
959
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)960 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
961 {
962 struct afs_vnode_cache_aux aux;
963
964 afs_set_cache_aux(vnode, &aux);
965 fscache_invalidate(afs_vnode_cache(vnode), &aux,
966 i_size_read(&vnode->netfs.inode), flags);
967 }
968
969 /*
970 * Directory iteration management.
971 */
972 struct afs_dir_iter {
973 struct afs_vnode *dvnode;
974 union afs_xdr_dir_block *block;
975 struct folio_queue *fq;
976 unsigned int fpos;
977 int fq_slot;
978 unsigned int loop_check;
979 u8 nr_slots;
980 u8 bucket;
981 unsigned int prev_entry;
982 };
983
984 #include <trace/events/afs.h>
985
986 /*****************************************************************************/
987 /*
988 * addr_list.c
989 */
990 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
991 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
992 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
993 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
994 const char *, size_t, char,
995 unsigned short, unsigned short);
996 bool afs_addr_list_same(const struct afs_addr_list *a,
997 const struct afs_addr_list *b);
998 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
999
1000 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1001 __be32 xdr, u16 port);
1002 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1003 __be32 *xdr, u16 port);
1004 void afs_set_peer_appdata(struct afs_server *server,
1005 struct afs_addr_list *old_alist,
1006 struct afs_addr_list *new_alist);
1007
1008 /*
1009 * addr_prefs.c
1010 */
1011 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1012 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1013 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
1014
1015 /*
1016 * callback.c
1017 */
1018 extern void afs_invalidate_mmap_work(struct work_struct *);
1019 extern void afs_init_callback_state(struct afs_server *);
1020 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1021 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1022 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1023
afs_calc_vnode_cb_break(struct afs_vnode * vnode)1024 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1025 {
1026 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1027 }
1028
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)1029 static inline bool afs_cb_is_broken(unsigned int cb_break,
1030 const struct afs_vnode *vnode)
1031 {
1032 return cb_break != (vnode->cb_break +
1033 atomic_read(&vnode->volume->cb_ro_snapshot) +
1034 atomic_read(&vnode->volume->cb_scrub));
1035 }
1036
1037 /*
1038 * cell.c
1039 */
1040 extern int afs_cell_init(struct afs_net *, const char *);
1041 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1042 enum afs_cell_trace);
1043 struct afs_cell *afs_lookup_cell(struct afs_net *net,
1044 const char *name, unsigned int namesz,
1045 const char *vllist, bool excl,
1046 enum afs_cell_trace trace);
1047 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1048 void afs_unuse_cell(struct afs_cell *cell, enum afs_cell_trace reason);
1049 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1050 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1051 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1052 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1053 void afs_set_cell_timer(struct afs_cell *cell, unsigned int delay_secs);
1054 extern void __net_exit afs_cell_purge(struct afs_net *);
1055
1056 /*
1057 * cmservice.c
1058 */
1059 extern bool afs_cm_incoming_call(struct afs_call *);
1060
1061 /*
1062 * dir.c
1063 */
1064 extern const struct file_operations afs_dir_file_operations;
1065 extern const struct inode_operations afs_dir_inode_operations;
1066 extern const struct address_space_operations afs_dir_aops;
1067 extern const struct dentry_operations afs_fs_dentry_operations;
1068
1069 ssize_t afs_read_single(struct afs_vnode *dvnode, struct file *file);
1070 ssize_t afs_read_dir(struct afs_vnode *dvnode, struct file *file)
1071 __acquires(&dvnode->validate_lock);
1072 extern void afs_d_release(struct dentry *);
1073 extern void afs_check_for_remote_deletion(struct afs_operation *);
1074 int afs_single_writepages(struct address_space *mapping,
1075 struct writeback_control *wbc);
1076
1077 /*
1078 * dir_edit.c
1079 */
1080 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1081 enum afs_edit_dir_reason);
1082 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1083 void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
1084 enum afs_edit_dir_reason why);
1085 void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode);
1086
1087 /*
1088 * dir_search.c
1089 */
1090 unsigned int afs_dir_hash_name(const struct qstr *name);
1091 bool afs_dir_init_iter(struct afs_dir_iter *iter, const struct qstr *name);
1092 union afs_xdr_dir_block *afs_dir_find_block(struct afs_dir_iter *iter, size_t block);
1093 int afs_dir_search_bucket(struct afs_dir_iter *iter, const struct qstr *name,
1094 struct afs_fid *_fid);
1095 int afs_dir_search(struct afs_vnode *dvnode, struct qstr *name,
1096 struct afs_fid *_fid, afs_dataversion_t *_dir_version);
1097
1098 /*
1099 * dir_silly.c
1100 */
1101 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1102 struct dentry *, struct key *);
1103 extern int afs_silly_iput(struct dentry *, struct inode *);
1104
1105 /*
1106 * dynroot.c
1107 */
1108 extern const struct inode_operations afs_dynroot_inode_operations;
1109 extern const struct dentry_operations afs_dynroot_dentry_operations;
1110
1111 struct inode *afs_dynroot_iget_root(struct super_block *sb);
1112
1113 /*
1114 * file.c
1115 */
1116 extern const struct address_space_operations afs_file_aops;
1117 extern const struct inode_operations afs_file_inode_operations;
1118 extern const struct file_operations afs_file_operations;
1119 extern const struct afs_operation_ops afs_fetch_data_operation;
1120 extern const struct netfs_request_ops afs_req_ops;
1121
1122 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1123 extern void afs_put_wb_key(struct afs_wb_key *);
1124 extern int afs_open(struct inode *, struct file *);
1125 extern int afs_release(struct inode *, struct file *);
1126 void afs_fetch_data_async_rx(struct work_struct *work);
1127 void afs_fetch_data_immediate_cancel(struct afs_call *call);
1128
1129 /*
1130 * flock.c
1131 */
1132 extern struct workqueue_struct *afs_lock_manager;
1133
1134 extern void afs_lock_op_done(struct afs_call *);
1135 extern void afs_lock_work(struct work_struct *);
1136 extern void afs_lock_may_be_available(struct afs_vnode *);
1137 extern int afs_lock(struct file *, int, struct file_lock *);
1138 extern int afs_flock(struct file *, int, struct file_lock *);
1139
1140 /*
1141 * fsclient.c
1142 */
1143 extern void afs_fs_fetch_status(struct afs_operation *);
1144 extern void afs_fs_fetch_data(struct afs_operation *);
1145 extern void afs_fs_create_file(struct afs_operation *);
1146 extern void afs_fs_make_dir(struct afs_operation *);
1147 extern void afs_fs_remove_file(struct afs_operation *);
1148 extern void afs_fs_remove_dir(struct afs_operation *);
1149 extern void afs_fs_link(struct afs_operation *);
1150 extern void afs_fs_symlink(struct afs_operation *);
1151 extern void afs_fs_rename(struct afs_operation *);
1152 extern void afs_fs_store_data(struct afs_operation *);
1153 extern void afs_fs_setattr(struct afs_operation *);
1154 extern void afs_fs_get_volume_status(struct afs_operation *);
1155 extern void afs_fs_set_lock(struct afs_operation *);
1156 extern void afs_fs_extend_lock(struct afs_operation *);
1157 extern void afs_fs_release_lock(struct afs_operation *);
1158 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1159 struct afs_address *addr, struct key *key);
1160 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1161 struct afs_endpoint_state *estate, unsigned int addr_index,
1162 struct key *key);
1163 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1164
1165 struct afs_acl {
1166 u32 size;
1167 u8 data[] __counted_by(size);
1168 };
1169
1170 extern void afs_fs_fetch_acl(struct afs_operation *);
1171 extern void afs_fs_store_acl(struct afs_operation *);
1172
1173 /*
1174 * fs_operation.c
1175 */
1176 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1177 extern int afs_put_operation(struct afs_operation *);
1178 extern bool afs_begin_vnode_operation(struct afs_operation *);
1179 extern void afs_end_vnode_operation(struct afs_operation *op);
1180 extern void afs_wait_for_operation(struct afs_operation *);
1181 extern int afs_do_sync_operation(struct afs_operation *);
1182
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1183 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1184 struct afs_vnode *vnode)
1185 {
1186 op->file[n].vnode = vnode;
1187 op->file[n].need_io_lock = true;
1188 }
1189
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1190 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1191 const struct afs_fid *fid)
1192 {
1193 op->file[n].fid = *fid;
1194 }
1195
1196 /*
1197 * fs_probe.c
1198 */
1199 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1200 enum afs_estate_trace where);
1201 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1202 extern void afs_fileserver_probe_result(struct afs_call *);
1203 int afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1204 struct afs_addr_list *new_alist, struct key *key);
1205 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1206 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1207 extern void afs_fs_probe_dispatcher(struct work_struct *);
1208 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1209 unsigned long exclude, bool is_intr);
1210 extern void afs_fs_probe_cleanup(struct afs_net *);
1211
1212 /*
1213 * inode.c
1214 */
1215 extern const struct afs_operation_ops afs_fetch_status_operation;
1216
1217 void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op);
1218 const char *afs_get_link(struct dentry *dentry, struct inode *inode,
1219 struct delayed_call *callback);
1220 int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
1221 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1222 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1223 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1224 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1225 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1226 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
1227 struct kstat *, u32, unsigned int);
1228 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1229 extern void afs_evict_inode(struct inode *);
1230 extern int afs_drop_inode(struct inode *);
1231
1232 /*
1233 * main.c
1234 */
1235 extern struct workqueue_struct *afs_wq;
1236 extern int afs_net_id;
1237
afs_net(struct net * net)1238 static inline struct afs_net *afs_net(struct net *net)
1239 {
1240 return net_generic(net, afs_net_id);
1241 }
1242
afs_sb2net(struct super_block * sb)1243 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1244 {
1245 return afs_net(AFS_FS_S(sb)->net_ns);
1246 }
1247
afs_d2net(struct dentry * dentry)1248 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1249 {
1250 return afs_sb2net(dentry->d_sb);
1251 }
1252
afs_i2net(struct inode * inode)1253 static inline struct afs_net *afs_i2net(struct inode *inode)
1254 {
1255 return afs_sb2net(inode->i_sb);
1256 }
1257
afs_v2net(struct afs_vnode * vnode)1258 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1259 {
1260 return afs_i2net(&vnode->netfs.inode);
1261 }
1262
afs_sock2net(struct sock * sk)1263 static inline struct afs_net *afs_sock2net(struct sock *sk)
1264 {
1265 return net_generic(sock_net(sk), afs_net_id);
1266 }
1267
__afs_stat(atomic_t * s)1268 static inline void __afs_stat(atomic_t *s)
1269 {
1270 atomic_inc(s);
1271 }
1272
1273 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1274
1275 /*
1276 * misc.c
1277 */
1278 extern int afs_abort_to_error(u32);
1279 extern void afs_prioritise_error(struct afs_error *, int, u32);
1280
afs_op_nomem(struct afs_operation * op)1281 static inline void afs_op_nomem(struct afs_operation *op)
1282 {
1283 op->cumul_error.error = -ENOMEM;
1284 }
1285
afs_op_error(const struct afs_operation * op)1286 static inline int afs_op_error(const struct afs_operation *op)
1287 {
1288 return op->cumul_error.error;
1289 }
1290
afs_op_abort_code(const struct afs_operation * op)1291 static inline s32 afs_op_abort_code(const struct afs_operation *op)
1292 {
1293 return op->cumul_error.abort_code;
1294 }
1295
afs_op_set_error(struct afs_operation * op,int error)1296 static inline int afs_op_set_error(struct afs_operation *op, int error)
1297 {
1298 return op->cumul_error.error = error;
1299 }
1300
afs_op_accumulate_error(struct afs_operation * op,int error,s32 abort_code)1301 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1302 {
1303 afs_prioritise_error(&op->cumul_error, error, abort_code);
1304 }
1305
1306 /*
1307 * mntpt.c
1308 */
1309 extern const struct inode_operations afs_mntpt_inode_operations;
1310 extern const struct inode_operations afs_autocell_inode_operations;
1311 extern const struct file_operations afs_mntpt_file_operations;
1312
1313 extern struct vfsmount *afs_d_automount(struct path *);
1314 extern void afs_mntpt_kill_timer(void);
1315
1316 /*
1317 * proc.c
1318 */
1319 #ifdef CONFIG_PROC_FS
1320 extern int __net_init afs_proc_init(struct afs_net *);
1321 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1322 extern int afs_proc_cell_setup(struct afs_cell *);
1323 extern void afs_proc_cell_remove(struct afs_cell *);
1324 extern void afs_put_sysnames(struct afs_sysnames *);
1325 #else
afs_proc_init(struct afs_net * net)1326 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1327 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1328 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1329 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1330 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1331 #endif
1332
1333 /*
1334 * rotate.c
1335 */
1336 void afs_clear_server_states(struct afs_operation *op);
1337 extern bool afs_select_fileserver(struct afs_operation *);
1338 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1339
1340 /*
1341 * rxrpc.c
1342 */
1343 extern struct workqueue_struct *afs_async_calls;
1344
1345 extern int __net_init afs_open_socket(struct afs_net *);
1346 extern void __net_exit afs_close_socket(struct afs_net *);
1347 extern void afs_charge_preallocation(struct work_struct *);
1348 extern void afs_put_call(struct afs_call *);
1349 void afs_deferred_put_call(struct afs_call *call);
1350 void afs_make_call(struct afs_call *call, gfp_t gfp);
1351 void afs_deliver_to_call(struct afs_call *call);
1352 void afs_wait_for_call_to_complete(struct afs_call *call);
1353 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1354 const struct afs_call_type *,
1355 size_t, size_t);
1356 extern void afs_flat_call_destructor(struct afs_call *);
1357 extern void afs_send_empty_reply(struct afs_call *);
1358 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1359 extern int afs_extract_data(struct afs_call *, bool);
1360 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1361
afs_get_call(struct afs_call * call,enum afs_call_trace why)1362 static inline struct afs_call *afs_get_call(struct afs_call *call,
1363 enum afs_call_trace why)
1364 {
1365 int r;
1366
1367 __refcount_inc(&call->ref, &r);
1368
1369 trace_afs_call(call->debug_id, why, r + 1,
1370 atomic_read(&call->net->nr_outstanding_calls),
1371 __builtin_return_address(0));
1372 return call;
1373 }
1374
afs_see_call(struct afs_call * call,enum afs_call_trace why)1375 static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why)
1376 {
1377 int r = refcount_read(&call->ref);
1378
1379 trace_afs_call(call->debug_id, why, r,
1380 atomic_read(&call->net->nr_outstanding_calls),
1381 __builtin_return_address(0));
1382 }
1383
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1384 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1385 gfp_t gfp)
1386 {
1387 struct afs_addr_list *alist = op->estate->addresses;
1388
1389 op->call = call;
1390 op->type = call->type;
1391 call->op = op;
1392 call->key = op->key;
1393 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1394 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1395 call->service_id = op->server->service_id;
1396 afs_make_call(call, gfp);
1397 }
1398
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1399 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1400 {
1401 call->iov_len = size;
1402 call->kvec[0].iov_base = buf;
1403 call->kvec[0].iov_len = size;
1404 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1405 }
1406
afs_extract_to_tmp(struct afs_call * call)1407 static inline void afs_extract_to_tmp(struct afs_call *call)
1408 {
1409 call->iov_len = sizeof(call->tmp);
1410 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1411 }
1412
afs_extract_to_tmp64(struct afs_call * call)1413 static inline void afs_extract_to_tmp64(struct afs_call *call)
1414 {
1415 call->iov_len = sizeof(call->tmp64);
1416 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1417 }
1418
afs_extract_discard(struct afs_call * call,size_t size)1419 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1420 {
1421 call->iov_len = size;
1422 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1423 }
1424
afs_extract_to_buf(struct afs_call * call,size_t size)1425 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1426 {
1427 call->iov_len = size;
1428 afs_extract_begin(call, call->buffer, size);
1429 }
1430
afs_transfer_reply(struct afs_call * call)1431 static inline int afs_transfer_reply(struct afs_call *call)
1432 {
1433 return afs_extract_data(call, false);
1434 }
1435
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1436 static inline bool afs_check_call_state(struct afs_call *call,
1437 enum afs_call_state state)
1438 {
1439 return READ_ONCE(call->state) == state;
1440 }
1441
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1442 static inline bool afs_set_call_state(struct afs_call *call,
1443 enum afs_call_state from,
1444 enum afs_call_state to)
1445 {
1446 bool ok = false;
1447
1448 spin_lock_bh(&call->state_lock);
1449 if (call->state == from) {
1450 call->state = to;
1451 trace_afs_call_state(call, from, to, 0, 0);
1452 ok = true;
1453 }
1454 spin_unlock_bh(&call->state_lock);
1455 return ok;
1456 }
1457
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1458 static inline void afs_set_call_complete(struct afs_call *call,
1459 int error, u32 remote_abort)
1460 {
1461 enum afs_call_state state;
1462 bool ok = false;
1463
1464 spin_lock_bh(&call->state_lock);
1465 state = call->state;
1466 if (state != AFS_CALL_COMPLETE) {
1467 call->abort_code = remote_abort;
1468 call->error = error;
1469 call->state = AFS_CALL_COMPLETE;
1470 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1471 error, remote_abort);
1472 ok = true;
1473 }
1474 spin_unlock_bh(&call->state_lock);
1475 if (ok) {
1476 trace_afs_call_done(call);
1477
1478 /* Asynchronous calls have two refs to release - one from the alloc and
1479 * one queued with the work item - and we can't just deallocate the
1480 * call because the work item may be queued again.
1481 */
1482 if (call->drop_ref)
1483 afs_put_call(call);
1484 }
1485 }
1486
1487 /*
1488 * security.c
1489 */
1490 extern void afs_put_permits(struct afs_permits *);
1491 extern void afs_clear_permits(struct afs_vnode *);
1492 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1493 struct afs_status_cb *);
1494 extern struct key *afs_request_key(struct afs_cell *);
1495 extern struct key *afs_request_key_rcu(struct afs_cell *);
1496 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1497 extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1498 extern void __exit afs_clean_up_permit_cache(void);
1499
1500 /*
1501 * server.c
1502 */
1503 extern spinlock_t afs_server_peer_lock;
1504
1505 struct afs_server *afs_find_server(const struct rxrpc_peer *peer);
1506 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1507 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1508 struct afs_server *afs_use_server(struct afs_server *server, bool activate,
1509 enum afs_server_trace reason);
1510 void afs_unuse_server(struct afs_net *net, struct afs_server *server,
1511 enum afs_server_trace reason);
1512 void afs_unuse_server_notime(struct afs_net *net, struct afs_server *server,
1513 enum afs_server_trace reason);
1514 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1515 void afs_purge_servers(struct afs_cell *cell);
1516 extern void afs_fs_probe_timer(struct timer_list *);
1517 void __net_exit afs_wait_for_servers(struct afs_net *net);
1518 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1519
afs_see_server(struct afs_server * server,enum afs_server_trace trace)1520 static inline void afs_see_server(struct afs_server *server, enum afs_server_trace trace)
1521 {
1522 int r = refcount_read(&server->ref);
1523 int a = atomic_read(&server->active);
1524
1525 trace_afs_server(server->debug_id, r, a, trace);
1526
1527 }
1528
afs_inc_servers_outstanding(struct afs_net * net)1529 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1530 {
1531 atomic_inc(&net->servers_outstanding);
1532 }
1533
afs_dec_servers_outstanding(struct afs_net * net)1534 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1535 {
1536 if (atomic_dec_and_test(&net->servers_outstanding))
1537 wake_up_var(&net->servers_outstanding);
1538 }
1539
afs_is_probing_server(struct afs_server * server)1540 static inline bool afs_is_probing_server(struct afs_server *server)
1541 {
1542 return list_empty(&server->probe_link);
1543 }
1544
1545 /*
1546 * server_list.c
1547 */
afs_get_serverlist(struct afs_server_list * slist)1548 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1549 {
1550 refcount_inc(&slist->usage);
1551 return slist;
1552 }
1553
1554 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1555 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1556 struct key *key,
1557 struct afs_vldb_entry *vldb);
1558 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1559 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1560 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1561 struct afs_server_list *old);
1562 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1563
1564 /*
1565 * super.c
1566 */
1567 extern int __init afs_fs_init(void);
1568 extern void afs_fs_exit(void);
1569
1570 /*
1571 * validation.c
1572 */
1573 bool afs_check_validity(const struct afs_vnode *vnode);
1574 int afs_update_volume_state(struct afs_operation *op);
1575 int afs_validate(struct afs_vnode *vnode, struct key *key);
1576
1577 /*
1578 * vlclient.c
1579 */
1580 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1581 const char *, int);
1582 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1583 struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1584 struct afs_addr_list *alist,
1585 unsigned int addr_index,
1586 struct key *key,
1587 struct afs_vlserver *server,
1588 unsigned int server_index);
1589 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1590 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1591
1592 /*
1593 * vl_alias.c
1594 */
1595 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1596
1597 /*
1598 * vl_probe.c
1599 */
1600 extern void afs_vlserver_probe_result(struct afs_call *);
1601 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1602 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1603
1604 /*
1605 * vl_rotate.c
1606 */
1607 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1608 struct afs_cell *, struct key *);
1609 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1610 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1611 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1612
1613 /*
1614 * vlserver_list.c
1615 */
afs_get_vlserver(struct afs_vlserver * vlserver)1616 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1617 {
1618 refcount_inc(&vlserver->ref);
1619 return vlserver;
1620 }
1621
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1622 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1623 {
1624 if (vllist)
1625 refcount_inc(&vllist->ref);
1626 return vllist;
1627 }
1628
1629 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1630 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1631 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1632 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1633 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1634 const void *, size_t);
1635
1636 /*
1637 * volume.c
1638 */
1639 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1640 extern int afs_activate_volume(struct afs_volume *);
1641 extern void afs_deactivate_volume(struct afs_volume *);
1642 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1643 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1644 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1645 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1646
1647 /*
1648 * write.c
1649 */
1650 void afs_prepare_write(struct netfs_io_subrequest *subreq);
1651 void afs_issue_write(struct netfs_io_subrequest *subreq);
1652 void afs_begin_writeback(struct netfs_io_request *wreq);
1653 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
1654 extern int afs_writepages(struct address_space *, struct writeback_control *);
1655 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1656 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1657 extern void afs_prune_wb_keys(struct afs_vnode *);
1658
1659 /*
1660 * xattr.c
1661 */
1662 extern const struct xattr_handler * const afs_xattr_handlers[];
1663
1664 /*
1665 * yfsclient.c
1666 */
1667 extern void yfs_fs_fetch_data(struct afs_operation *);
1668 extern void yfs_fs_create_file(struct afs_operation *);
1669 extern void yfs_fs_make_dir(struct afs_operation *);
1670 extern void yfs_fs_remove_file2(struct afs_operation *);
1671 extern void yfs_fs_remove_file(struct afs_operation *);
1672 extern void yfs_fs_remove_dir(struct afs_operation *);
1673 extern void yfs_fs_link(struct afs_operation *);
1674 extern void yfs_fs_symlink(struct afs_operation *);
1675 extern void yfs_fs_rename(struct afs_operation *);
1676 extern void yfs_fs_store_data(struct afs_operation *);
1677 extern void yfs_fs_setattr(struct afs_operation *);
1678 extern void yfs_fs_get_volume_status(struct afs_operation *);
1679 extern void yfs_fs_set_lock(struct afs_operation *);
1680 extern void yfs_fs_extend_lock(struct afs_operation *);
1681 extern void yfs_fs_release_lock(struct afs_operation *);
1682 extern void yfs_fs_fetch_status(struct afs_operation *);
1683 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1684
1685 struct yfs_acl {
1686 struct afs_acl *acl; /* Dir/file/symlink ACL */
1687 struct afs_acl *vol_acl; /* Whole volume ACL */
1688 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1689 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1690 unsigned int flags;
1691 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1692 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1693 };
1694
1695 extern void yfs_free_opaque_acl(struct yfs_acl *);
1696 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1697 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1698
1699 /*
1700 * Miscellaneous inline functions.
1701 */
AFS_FS_I(struct inode * inode)1702 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1703 {
1704 return container_of(inode, struct afs_vnode, netfs.inode);
1705 }
1706
AFS_VNODE_TO_I(struct afs_vnode * vnode)1707 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1708 {
1709 return &vnode->netfs.inode;
1710 }
1711
1712 /*
1713 * Note that a dentry got changed. We need to set d_fsdata to the data version
1714 * number derived from the result of the operation. It doesn't matter if
1715 * d_fsdata goes backwards as we'll just revalidate.
1716 */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1717 static inline void afs_update_dentry_version(struct afs_operation *op,
1718 struct afs_vnode_param *dir_vp,
1719 struct dentry *dentry)
1720 {
1721 if (!op->cumul_error.error)
1722 dentry->d_fsdata =
1723 (void *)(unsigned long)dir_vp->scb.status.data_version;
1724 }
1725
1726 /*
1727 * Set the file size and block count. Estimate the number of 512 bytes blocks
1728 * used, rounded up to nearest 1K for consistency with other AFS clients.
1729 */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1730 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1731 {
1732 i_size_write(&vnode->netfs.inode, size);
1733 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1734 }
1735
1736 /*
1737 * Check for a conflicting operation on a directory that we just unlinked from.
1738 * If someone managed to sneak a link or an unlink in on the file we just
1739 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1740 */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1741 static inline void afs_check_dir_conflict(struct afs_operation *op,
1742 struct afs_vnode_param *dvp)
1743 {
1744 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1745 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1746 }
1747
afs_io_error(struct afs_call * call,enum afs_io_error where)1748 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1749 {
1750 trace_afs_io_error(call->debug_id, -EIO, where);
1751 return -EIO;
1752 }
1753
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1754 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1755 {
1756 trace_afs_file_error(vnode, -EIO, where);
1757 return -EIO;
1758 }
1759
1760 /*
1761 * Set the callback promise on a vnode.
1762 */
afs_set_cb_promise(struct afs_vnode * vnode,time64_t expires_at,enum afs_cb_promise_trace trace)1763 static inline void afs_set_cb_promise(struct afs_vnode *vnode, time64_t expires_at,
1764 enum afs_cb_promise_trace trace)
1765 {
1766 atomic64_set(&vnode->cb_expires_at, expires_at);
1767 trace_afs_cb_promise(vnode, trace);
1768 }
1769
1770 /*
1771 * Clear the callback promise on a vnode, returning true if it was promised.
1772 */
afs_clear_cb_promise(struct afs_vnode * vnode,enum afs_cb_promise_trace trace)1773 static inline bool afs_clear_cb_promise(struct afs_vnode *vnode,
1774 enum afs_cb_promise_trace trace)
1775 {
1776 trace_afs_cb_promise(vnode, trace);
1777 return atomic64_xchg(&vnode->cb_expires_at, AFS_NO_CB_PROMISE) != AFS_NO_CB_PROMISE;
1778 }
1779
1780 /*
1781 * Mark a directory as being invalid.
1782 */
afs_invalidate_dir(struct afs_vnode * dvnode,enum afs_dir_invalid_trace trace)1783 static inline void afs_invalidate_dir(struct afs_vnode *dvnode,
1784 enum afs_dir_invalid_trace trace)
1785 {
1786 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1787 trace_afs_dir_invalid(dvnode, trace);
1788 afs_stat_v(dvnode, n_inval);
1789 }
1790 }
1791
1792 /*****************************************************************************/
1793 /*
1794 * debug tracing
1795 */
1796 extern unsigned afs_debug;
1797
1798 #define dbgprintk(FMT,...) \
1799 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1800
1801 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1802 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1803 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1804
1805
1806 #if defined(__KDEBUG)
1807 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1808 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1809 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1810
1811 #elif defined(CONFIG_AFS_DEBUG)
1812 #define AFS_DEBUG_KENTER 0x01
1813 #define AFS_DEBUG_KLEAVE 0x02
1814 #define AFS_DEBUG_KDEBUG 0x04
1815
1816 #define _enter(FMT,...) \
1817 do { \
1818 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1819 kenter(FMT,##__VA_ARGS__); \
1820 } while (0)
1821
1822 #define _leave(FMT,...) \
1823 do { \
1824 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1825 kleave(FMT,##__VA_ARGS__); \
1826 } while (0)
1827
1828 #define _debug(FMT,...) \
1829 do { \
1830 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1831 kdebug(FMT,##__VA_ARGS__); \
1832 } while (0)
1833
1834 #else
1835 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1836 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1837 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1838 #endif
1839
1840 /*
1841 * debug assertion checking
1842 */
1843 #if 1 // defined(__KDEBUGALL)
1844
1845 #define ASSERT(X) \
1846 do { \
1847 if (unlikely(!(X))) { \
1848 printk(KERN_ERR "\n"); \
1849 printk(KERN_ERR "AFS: Assertion failed\n"); \
1850 BUG(); \
1851 } \
1852 } while(0)
1853
1854 #define ASSERTCMP(X, OP, Y) \
1855 do { \
1856 if (unlikely(!((X) OP (Y)))) { \
1857 printk(KERN_ERR "\n"); \
1858 printk(KERN_ERR "AFS: Assertion failed\n"); \
1859 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1860 (unsigned long)(X), (unsigned long)(Y)); \
1861 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1862 (unsigned long)(X), (unsigned long)(Y)); \
1863 BUG(); \
1864 } \
1865 } while(0)
1866
1867 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1868 do { \
1869 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1870 printk(KERN_ERR "\n"); \
1871 printk(KERN_ERR "AFS: Assertion failed\n"); \
1872 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1873 (unsigned long)(L), (unsigned long)(N), \
1874 (unsigned long)(H)); \
1875 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1876 (unsigned long)(L), (unsigned long)(N), \
1877 (unsigned long)(H)); \
1878 BUG(); \
1879 } \
1880 } while(0)
1881
1882 #define ASSERTIF(C, X) \
1883 do { \
1884 if (unlikely((C) && !(X))) { \
1885 printk(KERN_ERR "\n"); \
1886 printk(KERN_ERR "AFS: Assertion failed\n"); \
1887 BUG(); \
1888 } \
1889 } while(0)
1890
1891 #define ASSERTIFCMP(C, X, OP, Y) \
1892 do { \
1893 if (unlikely((C) && !((X) OP (Y)))) { \
1894 printk(KERN_ERR "\n"); \
1895 printk(KERN_ERR "AFS: Assertion failed\n"); \
1896 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1897 (unsigned long)(X), (unsigned long)(Y)); \
1898 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1899 (unsigned long)(X), (unsigned long)(Y)); \
1900 BUG(); \
1901 } \
1902 } while(0)
1903
1904 #else
1905
1906 #define ASSERT(X) \
1907 do { \
1908 } while(0)
1909
1910 #define ASSERTCMP(X, OP, Y) \
1911 do { \
1912 } while(0)
1913
1914 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1915 do { \
1916 } while(0)
1917
1918 #define ASSERTIF(C, X) \
1919 do { \
1920 } while(0)
1921
1922 #define ASSERTIFCMP(C, X, OP, Y) \
1923 do { \
1924 } while(0)
1925
1926 #endif /* __KDEBUGALL */
1927