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 <crypto/krb5.h>
24 #include <net/net_namespace.h>
25 #include <net/netns/generic.h>
26 #include <net/sock.h>
27 #include <net/af_rxrpc.h>
28
29 #include "afs.h"
30 #include "afs_vl.h"
31
32 #define AFS_CELL_MAX_ADDRS 15
33
34 struct pagevec;
35 struct afs_call;
36 struct afs_vnode;
37 struct afs_server_probe;
38
39 /*
40 * Partial file-locking emulation mode. (The problem being that AFS3 only
41 * allows whole-file locks and no upgrading/downgrading).
42 */
43 enum afs_flock_mode {
44 afs_flock_mode_unset,
45 afs_flock_mode_local, /* Local locking only */
46 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
47 afs_flock_mode_strict, /* Always get a server lock for a partial lock */
48 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
49 };
50
51 struct afs_fs_context {
52 bool force; /* T to force cell type */
53 bool autocell; /* T if set auto mount operation */
54 bool dyn_root; /* T if dynamic root */
55 bool no_cell; /* T if the source is "none" (for dynroot) */
56 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
57 afs_voltype_t type; /* type of volume requested */
58 unsigned int volnamesz; /* size of volume name */
59 const char *volname; /* name of volume to mount */
60 struct afs_net *net; /* the AFS net namespace stuff */
61 struct afs_cell *cell; /* cell in which to find volume */
62 struct afs_volume *volume; /* volume record */
63 struct key *key; /* key to use for secure mounting */
64 };
65
66 enum afs_call_state {
67 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
68 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
69 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
70 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
71 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
72 AFS_CALL_SV_REPLYING, /* Server: Replying */
73 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
74 AFS_CALL_COMPLETE, /* Completed or failed */
75 };
76
77 /*
78 * Address preferences.
79 */
80 struct afs_addr_preference {
81 union {
82 struct in_addr ipv4_addr; /* AF_INET address to compare against */
83 struct in6_addr ipv6_addr; /* AF_INET6 address to compare against */
84 };
85 sa_family_t family; /* Which address to use */
86 u16 prio; /* Priority */
87 u8 subnet_mask; /* How many bits to compare */
88 };
89
90 struct afs_addr_preference_list {
91 struct rcu_head rcu;
92 u16 version; /* Incremented when prefs list changes */
93 u8 ipv6_off; /* Offset of IPv6 addresses */
94 u8 nr; /* Number of addresses in total */
95 u8 max_prefs; /* Number of prefs allocated */
96 struct afs_addr_preference prefs[] __counted_by(max_prefs);
97 };
98
99 struct afs_address {
100 struct rxrpc_peer *peer;
101 short last_error; /* Last error from this address */
102 u16 prio; /* Address priority */
103 };
104
105 /*
106 * List of server addresses.
107 */
108 struct afs_addr_list {
109 struct rcu_head rcu;
110 refcount_t usage;
111 u32 version; /* Version */
112 unsigned int debug_id;
113 unsigned int addr_pref_version; /* Version of address preference list */
114 unsigned char max_addrs;
115 unsigned char nr_addrs;
116 unsigned char preferred; /* Preferred address */
117 unsigned char nr_ipv4; /* Number of IPv4 addresses */
118 enum dns_record_source source:8;
119 enum dns_lookup_status status:8;
120 unsigned long probe_failed; /* Mask of addrs that failed locally/ICMP */
121 unsigned long responded; /* Mask of addrs that responded */
122 struct afs_address addrs[] __counted_by(max_addrs);
123 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
124 };
125
126 /*
127 * a record of an in-progress RxRPC call
128 */
129 struct afs_call {
130 const struct afs_call_type *type; /* type of call */
131 wait_queue_head_t waitq; /* processes awaiting completion */
132 struct work_struct async_work; /* async I/O processor */
133 struct work_struct work; /* actual work processor */
134 struct work_struct free_work; /* Deferred free processor */
135 struct rxrpc_call *rxcall; /* RxRPC call handle */
136 struct rxrpc_peer *peer; /* Remote endpoint */
137 struct key *key; /* security for this call */
138 struct afs_net *net; /* The network namespace */
139 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
140 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
141 void *request; /* request data (first part) */
142 size_t iov_len; /* Size of *iter to be used */
143 struct iov_iter def_iter; /* Default buffer/data iterator */
144 struct iov_iter *write_iter; /* Iterator defining write to be made */
145 struct iov_iter *iter; /* Iterator currently in use */
146 union { /* Convenience for ->def_iter */
147 struct kvec kvec[1];
148 struct bio_vec bvec[1];
149 };
150 void *buffer; /* reply receive buffer */
151 union {
152 struct afs_endpoint_state *probe;
153 struct afs_addr_list *vl_probe;
154 struct afs_addr_list *ret_alist;
155 struct afs_vldb_entry *ret_vldb;
156 char *ret_str;
157 };
158 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */
159 unsigned char probe_index; /* Address in ->probe_alist */
160 struct afs_operation *op;
161 unsigned int server_index;
162 refcount_t ref;
163 enum afs_call_state state;
164 spinlock_t state_lock;
165 int error; /* error code */
166 u32 abort_code; /* Remote abort ID or 0 */
167 unsigned long long remaining; /* How much is left to receive */
168 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
169 unsigned request_size; /* size of request data */
170 unsigned reply_max; /* maximum size of reply */
171 unsigned count2; /* count used in unmarshalling */
172 unsigned char unmarshall; /* unmarshalling phase */
173 bool drop_ref; /* T if need to drop ref for incoming call */
174 bool need_attention; /* T if RxRPC poked us */
175 bool async; /* T if asynchronous */
176 bool upgrade; /* T to request service upgrade */
177 bool intr; /* T if interruptible */
178 bool unmarshalling_error; /* T if an unmarshalling error occurred */
179 bool responded; /* Got a response from the call (may be abort) */
180 u8 security_ix; /* Security class */
181 u16 service_id; /* Actual service ID (after upgrade) */
182 unsigned int debug_id; /* Trace ID */
183 u32 enctype; /* Security encoding type */
184 u32 operation_ID; /* operation ID for an incoming call */
185 u32 count; /* count for use in unmarshalling */
186 union { /* place to extract temporary data */
187 struct {
188 __be32 tmp_u;
189 __be32 tmp;
190 } __attribute__((packed));
191 __be64 tmp64;
192 };
193 ktime_t issue_time; /* Time of issue of operation */
194 };
195
196 struct afs_call_type {
197 const char *name;
198 unsigned int op; /* Really enum afs_fs_operation */
199
200 /* deliver request or reply data to an call
201 * - returning an error will cause the call to be aborted
202 */
203 int (*deliver)(struct afs_call *call);
204
205 /* clean up a call */
206 void (*destructor)(struct afs_call *call);
207
208 /* Async receive processing function */
209 void (*async_rx)(struct work_struct *work);
210
211 /* Work function */
212 void (*work)(struct work_struct *work);
213
214 /* Call done function (gets called immediately on success or failure) */
215 void (*done)(struct afs_call *call);
216
217 /* Handle a call being immediately cancelled. */
218 void (*immediate_cancel)(struct afs_call *call);
219 };
220
221 /*
222 * Key available for writeback on a file.
223 */
224 struct afs_wb_key {
225 refcount_t usage;
226 struct key *key;
227 struct list_head vnode_link; /* Link in vnode->wb_keys */
228 };
229
230 /*
231 * AFS open file information record. Pointed to by file->private_data.
232 */
233 struct afs_file {
234 struct key *key; /* The key this file was opened with */
235 struct afs_wb_key *wb; /* Writeback key record for this file */
236 };
237
afs_file_key(struct file * file)238 static inline struct key *afs_file_key(struct file *file)
239 {
240 struct afs_file *af = file->private_data;
241
242 return af->key;
243 }
244
245 /*
246 * AFS superblock private data
247 * - there's one superblock per volume
248 */
249 struct afs_super_info {
250 struct net *net_ns; /* Network namespace */
251 struct afs_cell *cell; /* The cell in which the volume resides */
252 struct afs_volume *volume; /* volume record */
253 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
254 bool dyn_root; /* True if dynamic root */
255 };
256
AFS_FS_S(struct super_block * sb)257 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
258 {
259 return sb->s_fs_info;
260 }
261
262 extern struct file_system_type afs_fs_type;
263
264 /*
265 * Set of substitutes for @sys.
266 */
267 struct afs_sysnames {
268 #define AFS_NR_SYSNAME 16
269 char *subs[AFS_NR_SYSNAME];
270 refcount_t usage;
271 unsigned short nr;
272 char blank[1];
273 };
274
275 /*
276 * AFS network namespace record.
277 */
278 struct afs_net {
279 struct net *net; /* Backpointer to the owning net namespace */
280 struct afs_uuid uuid;
281 bool live; /* F if this namespace is being removed */
282
283 /* AF_RXRPC I/O stuff */
284 struct socket *socket;
285 struct afs_call *spare_incoming_call;
286 struct work_struct charge_preallocation_work;
287 struct work_struct rx_oob_work;
288 struct mutex socket_mutex;
289 atomic_t nr_outstanding_calls;
290 atomic_t nr_superblocks;
291
292 /* Cell database */
293 struct rb_root cells;
294 struct idr cells_dyn_ino; /* cell->dynroot_ino mapping */
295 struct afs_cell __rcu *ws_cell;
296 atomic_t cells_outstanding;
297 struct rw_semaphore cells_lock;
298 struct mutex cells_alias_lock;
299
300 struct mutex proc_cells_lock;
301 struct hlist_head proc_cells;
302
303 /* Known servers. Theoretically each fileserver can only be in one
304 * cell, but in practice, people create aliases and subsets and there's
305 * no easy way to distinguish them.
306 */
307 seqlock_t fs_lock; /* For fs_probe_*, fs_proc */
308 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
309 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
310 struct hlist_head fs_proc; /* procfs servers list */
311
312 struct key *fs_cm_token_key; /* Key for creating CM tokens */
313 struct work_struct fs_prober;
314 struct timer_list fs_probe_timer;
315 atomic_t servers_outstanding;
316
317 /* File locking renewal management */
318 struct mutex lock_manager_mutex;
319
320 /* Misc */
321 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
322 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
323 struct afs_sysnames *sysnames;
324 rwlock_t sysnames_lock;
325 struct afs_addr_preference_list __rcu *address_prefs;
326 u16 address_pref_version;
327
328 /* Statistics counters */
329 atomic_t n_lookup; /* Number of lookups done */
330 atomic_t n_reval; /* Number of dentries needing revalidation */
331 atomic_t n_inval; /* Number of invalidations by the server */
332 atomic_t n_relpg; /* Number of invalidations by release_folio */
333 atomic_t n_read_dir; /* Number of directory pages read */
334 atomic_t n_dir_cr; /* Number of directory entry creation edits */
335 atomic_t n_dir_rm; /* Number of directory entry removal edits */
336 atomic_t n_stores; /* Number of store ops */
337 atomic_long_t n_store_bytes; /* Number of bytes stored */
338 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
339 atomic_t n_fetches; /* Number of data fetch ops */
340 };
341
342 extern const char afs_init_sysname[];
343
344 enum afs_cell_state {
345 AFS_CELL_SETTING_UP,
346 AFS_CELL_UNLOOKED,
347 AFS_CELL_ACTIVE,
348 AFS_CELL_REMOVING,
349 AFS_CELL_DEAD,
350 };
351
352 /*
353 * AFS cell record.
354 *
355 * This is a tricky concept to get right as it is possible to create aliases
356 * simply by pointing AFSDB/SRV records for two names at the same set of VL
357 * servers; it is also possible to do things like setting up two sets of VL
358 * servers, one of which provides a superset of the volumes provided by the
359 * other (for internal/external division, for example).
360 *
361 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
362 * servers and (b) a cell's name is used by the client to select the key to use
363 * for authentication and encryption. The cell name is not typically used in
364 * the protocol.
365 *
366 * Two cells are determined to be aliases if they have an explicit alias (YFS
367 * only), share any VL servers in common or have at least one volume in common.
368 * "In common" means that the address list of the VL servers or the fileservers
369 * share at least one endpoint.
370 */
371 struct afs_cell {
372 union {
373 struct rcu_head rcu;
374 struct rb_node net_node; /* Node in net->cells */
375 };
376 struct afs_net *net;
377 struct afs_cell *alias_of; /* The cell this is an alias of */
378 struct afs_volume *root_volume; /* The root.cell volume if there is one */
379 struct key *anonymous_key; /* anonymous user key for this cell */
380 struct work_struct destroyer; /* Destroyer for cell */
381 struct work_struct manager; /* Manager for init/deinit/dns */
382 struct timer_list management_timer; /* General management timer */
383 struct hlist_node proc_link; /* /proc cell list link */
384 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
385 time64_t last_inactive; /* Time of last drop of usage count */
386 refcount_t ref; /* Struct refcount */
387 atomic_t active; /* Active usage counter */
388 unsigned long flags;
389 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
390 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
391 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
392 enum afs_cell_state state;
393 short error;
394 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
395 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
396 unsigned int dns_lookup_count; /* Counter of DNS lookups */
397 unsigned int debug_id;
398 unsigned int dynroot_ino; /* Inode numbers for dynroot (a pair) */
399
400 /* The volumes belonging to this cell */
401 struct rw_semaphore vs_lock; /* Lock for server->volumes */
402 struct rb_root volumes; /* Tree of volumes on this server */
403 struct hlist_head proc_volumes; /* procfs volume list */
404 seqlock_t volume_lock; /* For volumes */
405
406 /* Active fileserver interaction state. */
407 struct rb_root fs_servers; /* afs_server (by server UUID) */
408 struct rw_semaphore fs_lock; /* For fs_servers */
409
410 /* VL server list. */
411 rwlock_t vl_servers_lock; /* Lock on vl_servers */
412 struct afs_vlserver_list __rcu *vl_servers;
413
414 u8 name_len; /* Length of name */
415 char *name; /* Cell name, case-flattened and NUL-padded */
416 };
417
418 /*
419 * Volume Location server record.
420 */
421 struct afs_vlserver {
422 struct rcu_head rcu;
423 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
424 unsigned long flags;
425 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
426 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
427 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
428 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
429 rwlock_t lock; /* Lock on addresses */
430 refcount_t ref;
431 unsigned int rtt; /* Server's current RTT in uS */
432 unsigned int debug_id;
433
434 /* Probe state */
435 wait_queue_head_t probe_wq;
436 atomic_t probe_outstanding;
437 spinlock_t probe_lock;
438 struct {
439 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
440 u32 abort_code;
441 short error;
442 unsigned short flags;
443 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
444 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
445 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
446 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
447 } probe;
448
449 u16 service_id; /* Service ID we're using */
450 u16 port;
451 u16 name_len; /* Length of name */
452 char name[]; /* Server name, case-flattened */
453 };
454
455 /*
456 * Weighted list of Volume Location servers.
457 */
458 struct afs_vlserver_entry {
459 u16 priority; /* Preference (as SRV) */
460 u16 weight; /* Weight (as SRV) */
461 enum dns_record_source source:8;
462 enum dns_lookup_status status:8;
463 struct afs_vlserver *server;
464 };
465
466 struct afs_vlserver_list {
467 struct rcu_head rcu;
468 refcount_t ref;
469 u8 nr_servers;
470 u8 index; /* Server currently in use */
471 u8 preferred; /* Preferred server */
472 enum dns_record_source source:8;
473 enum dns_lookup_status status:8;
474 rwlock_t lock;
475 struct afs_vlserver_entry servers[];
476 };
477
478 /*
479 * Cached VLDB entry.
480 *
481 * This is pointed to by cell->vldb_entries, indexed by name.
482 */
483 struct afs_vldb_entry {
484 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
485
486 unsigned long flags;
487 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
488 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
489 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
490 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
491 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
492
493 uuid_t fs_server[AFS_NMAXNSERVERS];
494 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
495 u8 fs_mask[AFS_NMAXNSERVERS];
496 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
497 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
498 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
499 u8 vlsf_flags[AFS_NMAXNSERVERS];
500 short error;
501 u8 nr_servers; /* Number of server records */
502 u8 name_len;
503 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
504 };
505
506 /*
507 * Fileserver endpoint state. The records the addresses of a fileserver's
508 * endpoints and the state and result of a round of probing on them. This
509 * allows the rotation algorithm to access those results without them being
510 * erased by a subsequent round of probing.
511 */
512 struct afs_endpoint_state {
513 struct rcu_head rcu;
514 struct afs_addr_list *addresses; /* The addresses being probed */
515 unsigned long responsive_set; /* Bitset of responsive endpoints */
516 unsigned long failed_set; /* Bitset of endpoints we failed to probe */
517 refcount_t ref;
518 unsigned int server_id; /* Debug ID of server */
519 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */
520 atomic_t nr_probing; /* Number of outstanding probes */
521 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
522 s32 abort_code;
523 short error;
524 unsigned long flags;
525 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */
526 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */
527 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */
528 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */
529 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */
530 };
531
532 /*
533 * Record of fileserver with which we're actively communicating.
534 */
535 struct afs_server {
536 struct rcu_head rcu;
537 union {
538 uuid_t uuid; /* Server ID */
539 struct afs_uuid _uuid;
540 };
541
542 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
543 struct rb_node uuid_rb; /* Link in cell->fs_servers */
544 struct list_head probe_link; /* Link in net->fs_probe_* */
545 struct hlist_node proc_link; /* Link in net->fs_proc */
546 struct list_head volumes; /* RCU list of afs_server_entry objects */
547 struct work_struct destroyer; /* Work item to try and destroy a server */
548 struct timer_list timer; /* Management timer */
549 struct mutex cm_token_lock; /* Lock governing creation of appdata */
550 struct krb5_buffer cm_rxgk_appdata; /* Appdata to be included in RESPONSE packet */
551 time64_t unuse_time; /* Time at which last unused */
552 unsigned long flags;
553 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
554 #define AFS_SERVER_FL_UPDATING 1
555 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
556 #define AFS_SERVER_FL_UNCREATED 3 /* The record needs creating */
557 #define AFS_SERVER_FL_CREATING 4 /* The record is being created */
558 #define AFS_SERVER_FL_EXPIRED 5 /* The record has expired */
559 #define AFS_SERVER_FL_NOT_FOUND 6 /* VL server says no such server */
560 #define AFS_SERVER_FL_VL_FAIL 7 /* Failed to access VL server */
561 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
562 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
563 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
564 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
565 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
566 #define AFS_SERVER_FL_NO_RENAME2 20 /* YFS Fileserver doesn't support enhanced rename */
567 refcount_t ref; /* Object refcount */
568 atomic_t active; /* Active user count */
569 u32 addr_version; /* Address list version */
570 u16 service_id; /* Service ID we're using. */
571 short create_error; /* Creation error */
572 unsigned int rtt; /* Server's current RTT in uS */
573 unsigned int debug_id; /* Debugging ID for traces */
574
575 /* file service access */
576 rwlock_t fs_lock; /* access lock */
577
578 /* Probe state */
579 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
580 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
581 wait_queue_head_t probe_wq;
582 unsigned int probe_counter; /* Number of probes issued */
583 spinlock_t probe_lock;
584 };
585
586 enum afs_ro_replicating {
587 AFS_RO_NOT_REPLICATING, /* Not doing replication */
588 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */
589 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */
590 } __mode(byte);
591
592 /*
593 * Replaceable volume server list.
594 */
595 struct afs_server_entry {
596 struct afs_server *server;
597 struct afs_volume *volume;
598 struct list_head slink; /* Link in server->volumes */
599 time64_t cb_expires_at; /* Time at which volume-level callback expires */
600 unsigned long flags;
601 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */
602 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */
603 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */
604 };
605
606 struct afs_server_list {
607 struct rcu_head rcu;
608 refcount_t usage;
609 bool attached; /* T if attached to servers */
610 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */
611 unsigned char nr_servers;
612 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
613 unsigned int seq; /* Set to ->servers_seq when installed */
614 rwlock_t lock;
615 struct afs_server_entry servers[];
616 };
617
618 /*
619 * Live AFS volume management.
620 */
621 struct afs_volume {
622 struct rcu_head rcu;
623 afs_volid_t vid; /* The volume ID of this volume */
624 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
625 refcount_t ref;
626 unsigned int debug_id; /* Debugging ID for traces */
627 time64_t update_at; /* Time at which to next update */
628 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
629 struct rb_node cell_node; /* Link in cell->volumes */
630 struct hlist_node proc_link; /* Link in cell->proc_volumes */
631 struct super_block __rcu *sb; /* Superblock on which inodes reside */
632 struct work_struct destructor; /* Deferred destructor */
633 unsigned long flags;
634 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
635 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
636 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
637 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
638 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */
639 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */
640 #ifdef CONFIG_AFS_FSCACHE
641 struct fscache_volume *cache; /* Caching cookie */
642 #endif
643 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
644 rwlock_t servers_lock; /* Lock for ->servers */
645 unsigned int servers_seq; /* Incremented each time ->servers changes */
646
647 /* RO release tracking */
648 struct mutex volsync_lock; /* Time/state evaluation lock */
649 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */
650 time64_t update_time; /* Volume update time (or TIME64_MIN) */
651
652 /* Callback management */
653 struct mutex cb_check_lock; /* Lock to control race to check after v_break */
654 time64_t cb_expires_at; /* Earliest volume callback expiry time */
655 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */
656 atomic_t cb_v_break; /* Volume-break event counter. */
657 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */
658 atomic_t cb_scrub; /* Scrub-all-data event counter. */
659 rwlock_t cb_v_break_lock;
660 struct rw_semaphore open_mmaps_lock;
661 struct list_head open_mmaps; /* List of vnodes that are mmapped */
662
663 afs_voltype_t type; /* type of volume */
664 char type_force; /* force volume type (suppress R/O -> R/W) */
665 u8 name_len;
666 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
667 };
668
669 enum afs_lock_state {
670 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
671 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
672 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
673 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
674 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
675 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
676 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
677 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
678 };
679
680 /*
681 * AFS inode private data.
682 *
683 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
684 * leak from one inode to another.
685 */
686 struct afs_vnode {
687 struct netfs_inode netfs; /* Netfslib context and vfs inode */
688 struct afs_volume *volume; /* volume on which vnode resides */
689 struct afs_fid fid; /* the file identifier for this inode */
690 struct afs_file_status status; /* AFS status info for this file */
691 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
692 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
693 struct list_head io_lock_waiters; /* Threads waiting for the I/O lock */
694 struct rw_semaphore validate_lock; /* lock for validating this vnode */
695 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
696 struct key *silly_key; /* Silly rename key */
697 spinlock_t wb_lock; /* lock for wb_keys */
698 spinlock_t lock; /* waitqueue/flags lock */
699 unsigned long flags;
700 #define AFS_VNODE_IO_LOCK 0 /* Set if the I/O serialisation lock is held */
701 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
702 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
703 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
704 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
705 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
706 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
707 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
708 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
709 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
710 #define AFS_VNODE_DIR_READ 11 /* Set if we've read a dir's contents */
711
712 struct folio_queue *directory; /* Directory contents */
713 struct list_head wb_keys; /* List of keys available for writeback */
714 struct list_head pending_locks; /* locks waiting to be granted */
715 struct list_head granted_locks; /* locks granted on this file */
716 struct delayed_work lock_work; /* work to be done in locking */
717 struct key *lock_key; /* Key to be used in lock ops */
718 ktime_t locked_at; /* Time at which lock obtained */
719 enum afs_lock_state lock_state : 8;
720 afs_lock_type_t lock_type : 8;
721 unsigned int directory_size; /* Amount of space in ->directory */
722
723 /* outstanding callback notification on this file */
724 struct work_struct cb_work; /* Work for mmap'd files */
725 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
726 void *cb_server; /* Server with callback/filelock */
727 atomic_t cb_nr_mmap; /* Number of mmaps */
728 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */
729 unsigned int cb_scrub; /* Scrub counter on ->volume */
730 unsigned int cb_break; /* Break counter on vnode */
731 unsigned int cb_v_check; /* Break check counter on ->volume */
732 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
733
734 atomic64_t cb_expires_at; /* time at which callback expires */
735 #define AFS_NO_CB_PROMISE TIME64_MIN
736 };
737
afs_vnode_cache(struct afs_vnode * vnode)738 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
739 {
740 #ifdef CONFIG_AFS_FSCACHE
741 return netfs_i_cookie(&vnode->netfs);
742 #else
743 return NULL;
744 #endif
745 }
746
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)747 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
748 struct fscache_cookie *cookie)
749 {
750 #ifdef CONFIG_AFS_FSCACHE
751 vnode->netfs.cache = cookie;
752 if (cookie)
753 mapping_set_release_always(vnode->netfs.inode.i_mapping);
754 #endif
755 }
756
757 /*
758 * cached security record for one user's attempt to access a vnode
759 */
760 struct afs_permit {
761 struct key *key; /* RxRPC ticket holding a security context */
762 afs_access_t access; /* CallerAccess value for this key */
763 };
764
765 /*
766 * Immutable cache of CallerAccess records from attempts to access vnodes.
767 * These may be shared between multiple vnodes.
768 */
769 struct afs_permits {
770 struct rcu_head rcu;
771 struct hlist_node hash_node; /* Link in hash */
772 unsigned long h; /* Hash value for this permit list */
773 refcount_t usage;
774 unsigned short nr_permits; /* Number of records */
775 bool invalidated; /* Invalidated due to key change */
776 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
777 };
778
779 /*
780 * Error prioritisation and accumulation.
781 */
782 struct afs_error {
783 s32 abort_code; /* Cumulative abort code */
784 short error; /* Cumulative error */
785 bool responded; /* T if server responded */
786 bool aborted; /* T if ->error is from an abort */
787 };
788
789 /*
790 * Cursor for iterating over a set of volume location servers.
791 */
792 struct afs_vl_cursor {
793 struct afs_cell *cell; /* The cell we're querying */
794 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
795 struct afs_vlserver *server; /* Server on which this resides */
796 struct afs_addr_list *alist; /* Current address list (pins ref) */
797 struct key *key; /* Key for the server */
798 unsigned long untried_servers; /* Bitmask of untried servers */
799 unsigned long addr_tried; /* Tried addresses */
800 struct afs_error cumul_error; /* Cumulative error */
801 unsigned int debug_id;
802 s32 call_abort_code;
803 short call_error; /* Error from single call */
804 short server_index; /* Current server */
805 signed char addr_index; /* Current address */
806 unsigned short flags;
807 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
808 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
809 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
810 short nr_iterations; /* Number of server iterations */
811 bool call_responded; /* T if the current address responded */
812 };
813
814 /*
815 * Fileserver state tracking for an operation. An array of these is kept,
816 * indexed by server index.
817 */
818 struct afs_server_state {
819 /* Tracking of fileserver probe state. Other operations may interfere
820 * by probing a fileserver when accessing other volumes.
821 */
822 unsigned int probe_seq;
823 unsigned long untried_addrs; /* Addresses we haven't tried yet */
824 struct wait_queue_entry probe_waiter;
825 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
826 };
827
828 /*
829 * Fileserver operation methods.
830 */
831 struct afs_operation_ops {
832 void (*issue_afs_rpc)(struct afs_operation *op);
833 void (*issue_yfs_rpc)(struct afs_operation *op);
834 void (*success)(struct afs_operation *op);
835 void (*aborted)(struct afs_operation *op);
836 void (*failed)(struct afs_operation *op);
837 void (*edit_dir)(struct afs_operation *op);
838 void (*put)(struct afs_operation *op);
839 };
840
841 struct afs_vnode_param {
842 struct afs_vnode *vnode;
843 struct afs_fid fid; /* Fid to access */
844 struct afs_status_cb scb; /* Returned status and callback promise */
845 afs_dataversion_t dv_before; /* Data version before the call */
846 unsigned int cb_break_before; /* cb_break before the call */
847 u8 dv_delta; /* Expected change in data version */
848 bool put_vnode:1; /* T if we have a ref on the vnode */
849 bool need_io_lock:1; /* T if we need the I/O lock on this */
850 bool update_ctime:1; /* Need to update the ctime */
851 bool set_size:1; /* Must update i_size */
852 bool op_unlinked:1; /* True if file was unlinked by op */
853 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
854 bool modification:1; /* Set if the content gets modified */
855 };
856
857 /*
858 * Fileserver operation wrapper, handling server and address rotation
859 * asynchronously. May make simultaneous calls to multiple servers.
860 */
861 struct afs_operation {
862 struct afs_net *net; /* Network namespace */
863 struct key *key; /* Key for the cell */
864 const struct afs_call_type *type; /* Type of call done */
865 const struct afs_operation_ops *ops;
866
867 /* Parameters/results for the operation */
868 struct afs_volume *volume; /* Volume being accessed */
869 struct afs_vnode_param file[2];
870 struct afs_vnode_param *more_files;
871 struct afs_volsync pre_volsync; /* Volsync before op */
872 struct afs_volsync volsync; /* Volsync returned by op */
873 struct dentry *dentry; /* Dentry to be altered */
874 struct dentry *dentry_2; /* Second dentry to be altered */
875 struct timespec64 mtime; /* Modification time to record */
876 struct timespec64 ctime; /* Change time to set */
877 struct afs_error cumul_error; /* Cumulative error */
878 short nr_files; /* Number of entries in file[], more_files */
879 unsigned int debug_id;
880
881 unsigned int cb_v_break; /* Volume break counter before op */
882
883 union {
884 struct {
885 int which; /* Which ->file[] to fetch for */
886 } fetch_status;
887 struct {
888 int reason; /* enum afs_edit_dir_reason */
889 mode_t mode;
890 const char *symlink;
891 } create;
892 struct {
893 bool need_rehash;
894 } unlink;
895 struct {
896 struct dentry *rehash;
897 struct dentry *tmp;
898 unsigned int rename_flags;
899 bool new_negative;
900 } rename;
901 struct {
902 struct netfs_io_subrequest *subreq;
903 } fetch;
904 struct {
905 afs_lock_type_t type;
906 } lock;
907 struct {
908 struct iov_iter *write_iter;
909 loff_t pos;
910 loff_t size;
911 loff_t i_size;
912 } store;
913 struct {
914 struct iattr *attr;
915 loff_t old_i_size;
916 } setattr;
917 struct afs_acl *acl;
918 struct yfs_acl *yacl;
919 struct {
920 struct afs_volume_status vs;
921 struct kstatfs *buf;
922 } volstatus;
923 };
924
925 /* Fileserver iteration state */
926 struct afs_server_list *server_list; /* Current server list (pins ref) */
927 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
928 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */
929 struct afs_server_state *server_states; /* States of the servers involved */
930 struct afs_call *call;
931 unsigned long untried_servers; /* Bitmask of untried servers */
932 unsigned long addr_tried; /* Tried addresses */
933 s32 call_abort_code; /* Abort code from single call */
934 short call_error; /* Error from single call */
935 short server_index; /* Current server */
936 short nr_iterations; /* Number of server iterations */
937 signed char addr_index; /* Current address */
938 bool call_responded; /* T if the current address responded */
939
940 unsigned int flags;
941 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
942 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
943 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
944 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
945 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
946 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
947 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
948 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
949 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
950 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
951 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
952 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
953 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
954 #define AFS_OPERATION_ASYNC 0x2000 /* Set if should run asynchronously */
955 };
956
957 /*
958 * Cache auxiliary data.
959 */
960 struct afs_vnode_cache_aux {
961 __be64 data_version;
962 } __packed;
963
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)964 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
965 struct afs_vnode_cache_aux *aux)
966 {
967 aux->data_version = cpu_to_be64(vnode->status.data_version);
968 }
969
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)970 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
971 {
972 struct afs_vnode_cache_aux aux;
973
974 afs_set_cache_aux(vnode, &aux);
975 fscache_invalidate(afs_vnode_cache(vnode), &aux,
976 i_size_read(&vnode->netfs.inode), flags);
977 }
978
979 /*
980 * Directory iteration management.
981 */
982 struct afs_dir_iter {
983 struct afs_vnode *dvnode;
984 union afs_xdr_dir_block *block;
985 struct folio_queue *fq;
986 unsigned int fpos;
987 int fq_slot;
988 unsigned int loop_check;
989 u8 nr_slots;
990 u8 bucket;
991 unsigned int prev_entry;
992 };
993
994 #include <trace/events/afs.h>
995
996 /*****************************************************************************/
997 /*
998 * addr_list.c
999 */
1000 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
1001 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
1002 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
1003 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
1004 const char *, size_t, char,
1005 unsigned short, unsigned short);
1006 bool afs_addr_list_same(const struct afs_addr_list *a,
1007 const struct afs_addr_list *b);
1008 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
1009
1010 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1011 __be32 xdr, u16 port);
1012 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1013 __be32 *xdr, u16 port);
1014 void afs_set_peer_appdata(struct afs_server *server,
1015 struct afs_addr_list *old_alist,
1016 struct afs_addr_list *new_alist);
1017
1018 /*
1019 * addr_prefs.c
1020 */
1021 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1022 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1023 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
1024
1025 /*
1026 * callback.c
1027 */
1028 extern void afs_invalidate_mmap_work(struct work_struct *);
1029 extern void afs_init_callback_state(struct afs_server *);
1030 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1031 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1032 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1033
afs_calc_vnode_cb_break(struct afs_vnode * vnode)1034 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1035 {
1036 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1037 }
1038
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)1039 static inline bool afs_cb_is_broken(unsigned int cb_break,
1040 const struct afs_vnode *vnode)
1041 {
1042 return cb_break != (vnode->cb_break +
1043 atomic_read(&vnode->volume->cb_ro_snapshot) +
1044 atomic_read(&vnode->volume->cb_scrub));
1045 }
1046
1047 /*
1048 * cell.c
1049 */
1050 extern int afs_cell_init(struct afs_net *, const char *);
1051 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1052 enum afs_cell_trace);
1053 enum afs_lookup_cell_for {
1054 AFS_LOOKUP_CELL_DYNROOT,
1055 AFS_LOOKUP_CELL_MOUNTPOINT,
1056 AFS_LOOKUP_CELL_DIRECT_MOUNT,
1057 AFS_LOOKUP_CELL_PRELOAD,
1058 AFS_LOOKUP_CELL_ROOTCELL,
1059 AFS_LOOKUP_CELL_ALIAS_CHECK,
1060 };
1061 struct afs_cell *afs_lookup_cell(struct afs_net *net,
1062 const char *name, unsigned int namesz,
1063 const char *vllist,
1064 enum afs_lookup_cell_for reason,
1065 enum afs_cell_trace trace);
1066 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1067 void afs_unuse_cell(struct afs_cell *cell, enum afs_cell_trace reason);
1068 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1069 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1070 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1071 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1072 void afs_set_cell_timer(struct afs_cell *cell, unsigned int delay_secs);
1073 extern void __net_exit afs_cell_purge(struct afs_net *);
1074
1075 /*
1076 * cmservice.c
1077 */
1078 extern bool afs_cm_incoming_call(struct afs_call *);
1079
1080 /*
1081 * cm_security.c
1082 */
1083 void afs_process_oob_queue(struct work_struct *work);
1084 #ifdef CONFIG_RXGK
1085 int afs_create_token_key(struct afs_net *net, struct socket *socket);
1086 #else
afs_create_token_key(struct afs_net * net,struct socket * socket)1087 static inline int afs_create_token_key(struct afs_net *net, struct socket *socket)
1088 {
1089 return 0;
1090 }
1091 #endif
1092
1093 /*
1094 * dir.c
1095 */
1096 extern const struct file_operations afs_dir_file_operations;
1097 extern const struct inode_operations afs_dir_inode_operations;
1098 extern const struct address_space_operations afs_dir_aops;
1099 extern const struct dentry_operations afs_fs_dentry_operations;
1100
1101 ssize_t afs_read_single(struct afs_vnode *dvnode, struct file *file);
1102 ssize_t afs_read_dir(struct afs_vnode *dvnode, struct file *file)
1103 __acquires(&dvnode->validate_lock);
1104 extern void afs_d_release(struct dentry *);
1105 extern void afs_check_for_remote_deletion(struct afs_operation *);
1106 int afs_single_writepages(struct address_space *mapping,
1107 struct writeback_control *wbc);
1108
1109 /*
1110 * dir_edit.c
1111 */
1112 extern void afs_edit_dir_add(struct afs_vnode *, const struct qstr *, struct afs_fid *,
1113 enum afs_edit_dir_reason);
1114 extern void afs_edit_dir_remove(struct afs_vnode *, const struct qstr *, enum afs_edit_dir_reason);
1115 void afs_edit_dir_update(struct afs_vnode *vnode, const struct qstr *name,
1116 struct afs_vnode *new_dvnode, enum afs_edit_dir_reason why);
1117 void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode);
1118
1119 /*
1120 * dir_search.c
1121 */
1122 unsigned int afs_dir_hash_name(const struct qstr *name);
1123 bool afs_dir_init_iter(struct afs_dir_iter *iter, const struct qstr *name);
1124 union afs_xdr_dir_block *afs_dir_find_block(struct afs_dir_iter *iter, size_t block);
1125 int afs_dir_search_bucket(struct afs_dir_iter *iter, const struct qstr *name,
1126 struct afs_fid *_fid);
1127 int afs_dir_search(struct afs_vnode *dvnode, const struct qstr *name,
1128 struct afs_fid *_fid, afs_dataversion_t *_dir_version);
1129
1130 /*
1131 * dir_silly.c
1132 */
1133 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1134 struct dentry *, struct key *);
1135 extern int afs_silly_iput(struct dentry *, struct inode *);
1136
1137 /*
1138 * dynroot.c
1139 */
1140 extern const struct inode_operations afs_dynroot_inode_operations;
1141 extern const struct dentry_operations afs_dynroot_dentry_operations;
1142
1143 struct inode *afs_dynroot_iget_root(struct super_block *sb);
1144
1145 /*
1146 * file.c
1147 */
1148 extern const struct address_space_operations afs_file_aops;
1149 extern const struct inode_operations afs_file_inode_operations;
1150 extern const struct file_operations afs_file_operations;
1151 extern const struct afs_operation_ops afs_fetch_data_operation;
1152 extern const struct netfs_request_ops afs_req_ops;
1153
1154 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1155 extern void afs_put_wb_key(struct afs_wb_key *);
1156 extern int afs_open(struct inode *, struct file *);
1157 extern int afs_release(struct inode *, struct file *);
1158 void afs_fetch_data_async_rx(struct work_struct *work);
1159 void afs_fetch_data_immediate_cancel(struct afs_call *call);
1160
1161 /*
1162 * flock.c
1163 */
1164 extern struct workqueue_struct *afs_lock_manager;
1165
1166 extern void afs_lock_op_done(struct afs_call *);
1167 extern void afs_lock_work(struct work_struct *);
1168 extern void afs_lock_may_be_available(struct afs_vnode *);
1169 extern int afs_lock(struct file *, int, struct file_lock *);
1170 extern int afs_flock(struct file *, int, struct file_lock *);
1171
1172 /*
1173 * fsclient.c
1174 */
1175 extern void afs_fs_fetch_status(struct afs_operation *);
1176 extern void afs_fs_fetch_data(struct afs_operation *);
1177 extern void afs_fs_create_file(struct afs_operation *);
1178 extern void afs_fs_make_dir(struct afs_operation *);
1179 extern void afs_fs_remove_file(struct afs_operation *);
1180 extern void afs_fs_remove_dir(struct afs_operation *);
1181 extern void afs_fs_link(struct afs_operation *);
1182 extern void afs_fs_symlink(struct afs_operation *);
1183 extern void afs_fs_rename(struct afs_operation *);
1184 extern void afs_fs_store_data(struct afs_operation *);
1185 extern void afs_fs_setattr(struct afs_operation *);
1186 extern void afs_fs_get_volume_status(struct afs_operation *);
1187 extern void afs_fs_set_lock(struct afs_operation *);
1188 extern void afs_fs_extend_lock(struct afs_operation *);
1189 extern void afs_fs_release_lock(struct afs_operation *);
1190 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1191 struct afs_address *addr, struct key *key);
1192 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1193 struct afs_endpoint_state *estate, unsigned int addr_index,
1194 struct key *key);
1195 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1196
1197 struct afs_acl {
1198 u32 size;
1199 u8 data[] __counted_by(size);
1200 };
1201
1202 extern void afs_fs_fetch_acl(struct afs_operation *);
1203 extern void afs_fs_store_acl(struct afs_operation *);
1204
1205 /*
1206 * fs_operation.c
1207 */
1208 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1209 extern int afs_put_operation(struct afs_operation *);
1210 extern bool afs_begin_vnode_operation(struct afs_operation *);
1211 extern void afs_end_vnode_operation(struct afs_operation *op);
1212 extern void afs_wait_for_operation(struct afs_operation *);
1213 extern int afs_do_sync_operation(struct afs_operation *);
1214
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1215 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1216 struct afs_vnode *vnode)
1217 {
1218 op->file[n].vnode = vnode;
1219 op->file[n].need_io_lock = true;
1220 }
1221
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1222 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1223 const struct afs_fid *fid)
1224 {
1225 op->file[n].fid = *fid;
1226 }
1227
1228 /*
1229 * fs_probe.c
1230 */
1231 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1232 enum afs_estate_trace where);
1233 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1234 extern void afs_fileserver_probe_result(struct afs_call *);
1235 int afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1236 struct afs_addr_list *new_alist, struct key *key);
1237 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1238 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1239 extern void afs_fs_probe_dispatcher(struct work_struct *);
1240 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1241 unsigned long exclude, bool is_intr);
1242 extern void afs_fs_probe_cleanup(struct afs_net *);
1243
1244 /*
1245 * inode.c
1246 */
1247 extern const struct afs_operation_ops afs_fetch_status_operation;
1248
1249 void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op);
1250 const char *afs_get_link(struct dentry *dentry, struct inode *inode,
1251 struct delayed_call *callback);
1252 int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
1253 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1254 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1255 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1256 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1257 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1258 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
1259 struct kstat *, u32, unsigned int);
1260 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1261 extern void afs_evict_inode(struct inode *);
1262 extern int afs_drop_inode(struct inode *);
1263
1264 /*
1265 * main.c
1266 */
1267 extern struct workqueue_struct *afs_wq;
1268 extern int afs_net_id;
1269
afs_net(struct net * net)1270 static inline struct afs_net *afs_net(struct net *net)
1271 {
1272 return net_generic(net, afs_net_id);
1273 }
1274
afs_sb2net(struct super_block * sb)1275 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1276 {
1277 return afs_net(AFS_FS_S(sb)->net_ns);
1278 }
1279
afs_d2net(struct dentry * dentry)1280 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1281 {
1282 return afs_sb2net(dentry->d_sb);
1283 }
1284
afs_i2net(struct inode * inode)1285 static inline struct afs_net *afs_i2net(struct inode *inode)
1286 {
1287 return afs_sb2net(inode->i_sb);
1288 }
1289
afs_v2net(struct afs_vnode * vnode)1290 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1291 {
1292 return afs_i2net(&vnode->netfs.inode);
1293 }
1294
afs_sock2net(struct sock * sk)1295 static inline struct afs_net *afs_sock2net(struct sock *sk)
1296 {
1297 return net_generic(sock_net(sk), afs_net_id);
1298 }
1299
__afs_stat(atomic_t * s)1300 static inline void __afs_stat(atomic_t *s)
1301 {
1302 atomic_inc(s);
1303 }
1304
1305 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1306
1307 /*
1308 * misc.c
1309 */
1310 extern int afs_abort_to_error(u32);
1311 extern void afs_prioritise_error(struct afs_error *, int, u32);
1312
afs_op_nomem(struct afs_operation * op)1313 static inline void afs_op_nomem(struct afs_operation *op)
1314 {
1315 op->cumul_error.error = -ENOMEM;
1316 }
1317
afs_op_error(const struct afs_operation * op)1318 static inline int afs_op_error(const struct afs_operation *op)
1319 {
1320 return op->cumul_error.error;
1321 }
1322
afs_op_abort_code(const struct afs_operation * op)1323 static inline s32 afs_op_abort_code(const struct afs_operation *op)
1324 {
1325 return op->cumul_error.abort_code;
1326 }
1327
afs_op_set_error(struct afs_operation * op,int error)1328 static inline int afs_op_set_error(struct afs_operation *op, int error)
1329 {
1330 return op->cumul_error.error = error;
1331 }
1332
afs_op_accumulate_error(struct afs_operation * op,int error,s32 abort_code)1333 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1334 {
1335 afs_prioritise_error(&op->cumul_error, error, abort_code);
1336 }
1337
1338 /*
1339 * mntpt.c
1340 */
1341 extern const struct inode_operations afs_mntpt_inode_operations;
1342 extern const struct inode_operations afs_autocell_inode_operations;
1343 extern const struct file_operations afs_mntpt_file_operations;
1344
1345 extern struct vfsmount *afs_d_automount(struct path *);
1346 extern void afs_mntpt_kill_timer(void);
1347
1348 /*
1349 * proc.c
1350 */
1351 #ifdef CONFIG_PROC_FS
1352 extern int __net_init afs_proc_init(struct afs_net *);
1353 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1354 extern int afs_proc_cell_setup(struct afs_cell *);
1355 extern void afs_proc_cell_remove(struct afs_cell *);
1356 extern void afs_put_sysnames(struct afs_sysnames *);
1357 #else
afs_proc_init(struct afs_net * net)1358 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1359 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1360 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1361 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1362 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1363 #endif
1364
1365 /*
1366 * rotate.c
1367 */
1368 void afs_clear_server_states(struct afs_operation *op);
1369 extern bool afs_select_fileserver(struct afs_operation *);
1370 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1371
1372 /*
1373 * rxrpc.c
1374 */
1375 extern struct workqueue_struct *afs_async_calls;
1376
1377 extern int __net_init afs_open_socket(struct afs_net *);
1378 extern void __net_exit afs_close_socket(struct afs_net *);
1379 extern void afs_charge_preallocation(struct work_struct *);
1380 extern void afs_put_call(struct afs_call *);
1381 void afs_deferred_put_call(struct afs_call *call);
1382 void afs_make_call(struct afs_call *call, gfp_t gfp);
1383 void afs_deliver_to_call(struct afs_call *call);
1384 void afs_wait_for_call_to_complete(struct afs_call *call);
1385 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1386 const struct afs_call_type *,
1387 size_t, size_t);
1388 extern void afs_flat_call_destructor(struct afs_call *);
1389 extern void afs_send_empty_reply(struct afs_call *);
1390 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1391 extern int afs_extract_data(struct afs_call *, bool);
1392 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1393
afs_get_call(struct afs_call * call,enum afs_call_trace why)1394 static inline struct afs_call *afs_get_call(struct afs_call *call,
1395 enum afs_call_trace why)
1396 {
1397 int r;
1398
1399 __refcount_inc(&call->ref, &r);
1400
1401 trace_afs_call(call->debug_id, why, r + 1,
1402 atomic_read(&call->net->nr_outstanding_calls),
1403 __builtin_return_address(0));
1404 return call;
1405 }
1406
afs_see_call(struct afs_call * call,enum afs_call_trace why)1407 static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why)
1408 {
1409 int r = refcount_read(&call->ref);
1410
1411 trace_afs_call(call->debug_id, why, r,
1412 atomic_read(&call->net->nr_outstanding_calls),
1413 __builtin_return_address(0));
1414 }
1415
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1416 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1417 gfp_t gfp)
1418 {
1419 struct afs_addr_list *alist = op->estate->addresses;
1420
1421 op->call = call;
1422 op->type = call->type;
1423 call->op = op;
1424 call->key = op->key;
1425 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1426 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1427 call->service_id = op->server->service_id;
1428 afs_make_call(call, gfp);
1429 }
1430
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1431 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1432 {
1433 call->iov_len = size;
1434 call->kvec[0].iov_base = buf;
1435 call->kvec[0].iov_len = size;
1436 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1437 }
1438
afs_extract_to_tmp(struct afs_call * call)1439 static inline void afs_extract_to_tmp(struct afs_call *call)
1440 {
1441 call->iov_len = sizeof(call->tmp);
1442 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1443 }
1444
afs_extract_to_tmp64(struct afs_call * call)1445 static inline void afs_extract_to_tmp64(struct afs_call *call)
1446 {
1447 call->iov_len = sizeof(call->tmp64);
1448 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1449 }
1450
afs_extract_discard(struct afs_call * call,size_t size)1451 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1452 {
1453 call->iov_len = size;
1454 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1455 }
1456
afs_extract_to_buf(struct afs_call * call,size_t size)1457 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1458 {
1459 call->iov_len = size;
1460 afs_extract_begin(call, call->buffer, size);
1461 }
1462
afs_transfer_reply(struct afs_call * call)1463 static inline int afs_transfer_reply(struct afs_call *call)
1464 {
1465 return afs_extract_data(call, false);
1466 }
1467
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1468 static inline bool afs_check_call_state(struct afs_call *call,
1469 enum afs_call_state state)
1470 {
1471 return READ_ONCE(call->state) == state;
1472 }
1473
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1474 static inline bool afs_set_call_state(struct afs_call *call,
1475 enum afs_call_state from,
1476 enum afs_call_state to)
1477 {
1478 bool ok = false;
1479
1480 spin_lock_bh(&call->state_lock);
1481 if (call->state == from) {
1482 call->state = to;
1483 trace_afs_call_state(call, from, to, 0, 0);
1484 ok = true;
1485 }
1486 spin_unlock_bh(&call->state_lock);
1487 return ok;
1488 }
1489
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1490 static inline void afs_set_call_complete(struct afs_call *call,
1491 int error, u32 remote_abort)
1492 {
1493 enum afs_call_state state;
1494 bool ok = false;
1495
1496 spin_lock_bh(&call->state_lock);
1497 state = call->state;
1498 if (state != AFS_CALL_COMPLETE) {
1499 call->abort_code = remote_abort;
1500 call->error = error;
1501 call->state = AFS_CALL_COMPLETE;
1502 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1503 error, remote_abort);
1504 ok = true;
1505 }
1506 spin_unlock_bh(&call->state_lock);
1507 if (ok) {
1508 trace_afs_call_done(call);
1509
1510 /* Asynchronous calls have two refs to release - one from the alloc and
1511 * one queued with the work item - and we can't just deallocate the
1512 * call because the work item may be queued again.
1513 */
1514 if (call->drop_ref)
1515 afs_put_call(call);
1516 }
1517 }
1518
1519 /*
1520 * security.c
1521 */
1522 extern void afs_put_permits(struct afs_permits *);
1523 extern void afs_clear_permits(struct afs_vnode *);
1524 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1525 struct afs_status_cb *);
1526 extern struct key *afs_request_key(struct afs_cell *);
1527 extern struct key *afs_request_key_rcu(struct afs_cell *);
1528 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1529 extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1530 extern void __exit afs_clean_up_permit_cache(void);
1531
1532 /*
1533 * server.c
1534 */
1535 extern spinlock_t afs_server_peer_lock;
1536
1537 struct afs_server *afs_find_server(const struct rxrpc_peer *peer);
1538 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1539 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1540 struct afs_server *afs_use_server(struct afs_server *server, bool activate,
1541 enum afs_server_trace reason);
1542 void afs_unuse_server(struct afs_net *net, struct afs_server *server,
1543 enum afs_server_trace reason);
1544 void afs_unuse_server_notime(struct afs_net *net, struct afs_server *server,
1545 enum afs_server_trace reason);
1546 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1547 void afs_purge_servers(struct afs_cell *cell);
1548 extern void afs_fs_probe_timer(struct timer_list *);
1549 void __net_exit afs_wait_for_servers(struct afs_net *net);
1550 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1551
afs_see_server(struct afs_server * server,enum afs_server_trace trace)1552 static inline void afs_see_server(struct afs_server *server, enum afs_server_trace trace)
1553 {
1554 int r = refcount_read(&server->ref);
1555 int a = atomic_read(&server->active);
1556
1557 trace_afs_server(server->debug_id, r, a, trace);
1558
1559 }
1560
afs_inc_servers_outstanding(struct afs_net * net)1561 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1562 {
1563 atomic_inc(&net->servers_outstanding);
1564 }
1565
afs_dec_servers_outstanding(struct afs_net * net)1566 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1567 {
1568 if (atomic_dec_and_test(&net->servers_outstanding))
1569 wake_up_var(&net->servers_outstanding);
1570 }
1571
afs_is_probing_server(struct afs_server * server)1572 static inline bool afs_is_probing_server(struct afs_server *server)
1573 {
1574 return list_empty(&server->probe_link);
1575 }
1576
1577 /*
1578 * server_list.c
1579 */
afs_get_serverlist(struct afs_server_list * slist)1580 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1581 {
1582 refcount_inc(&slist->usage);
1583 return slist;
1584 }
1585
1586 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1587 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1588 struct key *key,
1589 struct afs_vldb_entry *vldb);
1590 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1591 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1592 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1593 struct afs_server_list *old);
1594 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1595
1596 /*
1597 * super.c
1598 */
1599 extern int __init afs_fs_init(void);
1600 extern void afs_fs_exit(void);
1601
1602 /*
1603 * validation.c
1604 */
1605 bool afs_check_validity(const struct afs_vnode *vnode);
1606 int afs_update_volume_state(struct afs_operation *op);
1607 int afs_validate(struct afs_vnode *vnode, struct key *key);
1608
1609 /*
1610 * vlclient.c
1611 */
1612 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1613 const char *, int);
1614 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1615 struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1616 struct afs_addr_list *alist,
1617 unsigned int addr_index,
1618 struct key *key,
1619 struct afs_vlserver *server,
1620 unsigned int server_index);
1621 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1622 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1623
1624 /*
1625 * vl_alias.c
1626 */
1627 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1628
1629 /*
1630 * vl_probe.c
1631 */
1632 extern void afs_vlserver_probe_result(struct afs_call *);
1633 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1634 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1635
1636 /*
1637 * vl_rotate.c
1638 */
1639 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1640 struct afs_cell *, struct key *);
1641 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1642 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1643 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1644
1645 /*
1646 * vlserver_list.c
1647 */
afs_get_vlserver(struct afs_vlserver * vlserver)1648 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1649 {
1650 refcount_inc(&vlserver->ref);
1651 return vlserver;
1652 }
1653
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1654 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1655 {
1656 if (vllist)
1657 refcount_inc(&vllist->ref);
1658 return vllist;
1659 }
1660
1661 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1662 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1663 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1664 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1665 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1666 const void *, size_t);
1667
1668 /*
1669 * volume.c
1670 */
1671 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1672 extern int afs_activate_volume(struct afs_volume *);
1673 extern void afs_deactivate_volume(struct afs_volume *);
1674 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1675 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1676 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1677 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1678
1679 /*
1680 * write.c
1681 */
1682 void afs_prepare_write(struct netfs_io_subrequest *subreq);
1683 void afs_issue_write(struct netfs_io_subrequest *subreq);
1684 void afs_begin_writeback(struct netfs_io_request *wreq);
1685 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
1686 extern int afs_writepages(struct address_space *, struct writeback_control *);
1687 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1688 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1689 extern void afs_prune_wb_keys(struct afs_vnode *);
1690
1691 /*
1692 * xattr.c
1693 */
1694 extern const struct xattr_handler * const afs_xattr_handlers[];
1695
1696 /*
1697 * yfsclient.c
1698 */
1699 extern void yfs_fs_fetch_data(struct afs_operation *);
1700 extern void yfs_fs_create_file(struct afs_operation *);
1701 extern void yfs_fs_make_dir(struct afs_operation *);
1702 extern void yfs_fs_remove_file2(struct afs_operation *);
1703 extern void yfs_fs_remove_file(struct afs_operation *);
1704 extern void yfs_fs_remove_dir(struct afs_operation *);
1705 extern void yfs_fs_link(struct afs_operation *);
1706 extern void yfs_fs_symlink(struct afs_operation *);
1707 extern void yfs_fs_rename(struct afs_operation *);
1708 void yfs_fs_rename_replace(struct afs_operation *op);
1709 void yfs_fs_rename_noreplace(struct afs_operation *op);
1710 void yfs_fs_rename_exchange(struct afs_operation *op);
1711 extern void yfs_fs_store_data(struct afs_operation *);
1712 extern void yfs_fs_setattr(struct afs_operation *);
1713 extern void yfs_fs_get_volume_status(struct afs_operation *);
1714 extern void yfs_fs_set_lock(struct afs_operation *);
1715 extern void yfs_fs_extend_lock(struct afs_operation *);
1716 extern void yfs_fs_release_lock(struct afs_operation *);
1717 extern void yfs_fs_fetch_status(struct afs_operation *);
1718 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1719
1720 struct yfs_acl {
1721 struct afs_acl *acl; /* Dir/file/symlink ACL */
1722 struct afs_acl *vol_acl; /* Whole volume ACL */
1723 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1724 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1725 unsigned int flags;
1726 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1727 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1728 };
1729
1730 extern void yfs_free_opaque_acl(struct yfs_acl *);
1731 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1732 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1733
1734 /*
1735 * Miscellaneous inline functions.
1736 */
AFS_FS_I(struct inode * inode)1737 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1738 {
1739 return container_of(inode, struct afs_vnode, netfs.inode);
1740 }
1741
AFS_VNODE_TO_I(struct afs_vnode * vnode)1742 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1743 {
1744 return &vnode->netfs.inode;
1745 }
1746
1747 /*
1748 * Note that a dentry got changed. We need to set d_fsdata to the data version
1749 * number derived from the result of the operation. It doesn't matter if
1750 * d_fsdata goes backwards as we'll just revalidate.
1751 */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1752 static inline void afs_update_dentry_version(struct afs_operation *op,
1753 struct afs_vnode_param *dir_vp,
1754 struct dentry *dentry)
1755 {
1756 if (!op->cumul_error.error)
1757 dentry->d_fsdata =
1758 (void *)(unsigned long)dir_vp->scb.status.data_version;
1759 }
1760
1761 /*
1762 * Set the file size and block count. Estimate the number of 512 bytes blocks
1763 * used, rounded up to nearest 1K for consistency with other AFS clients.
1764 */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1765 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1766 {
1767 i_size_write(&vnode->netfs.inode, size);
1768 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1769 }
1770
1771 /*
1772 * Check for a conflicting operation on a directory that we just unlinked from.
1773 * If someone managed to sneak a link or an unlink in on the file we just
1774 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1775 */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1776 static inline void afs_check_dir_conflict(struct afs_operation *op,
1777 struct afs_vnode_param *dvp)
1778 {
1779 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1780 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1781 }
1782
afs_io_error(struct afs_call * call,enum afs_io_error where)1783 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1784 {
1785 trace_afs_io_error(call->debug_id, -EIO, where);
1786 return -EIO;
1787 }
1788
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1789 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1790 {
1791 trace_afs_file_error(vnode, -EIO, where);
1792 return -EIO;
1793 }
1794
1795 /*
1796 * Set the callback promise on a vnode.
1797 */
afs_set_cb_promise(struct afs_vnode * vnode,time64_t expires_at,enum afs_cb_promise_trace trace)1798 static inline void afs_set_cb_promise(struct afs_vnode *vnode, time64_t expires_at,
1799 enum afs_cb_promise_trace trace)
1800 {
1801 atomic64_set(&vnode->cb_expires_at, expires_at);
1802 trace_afs_cb_promise(vnode, trace);
1803 }
1804
1805 /*
1806 * Clear the callback promise on a vnode, returning true if it was promised.
1807 */
afs_clear_cb_promise(struct afs_vnode * vnode,enum afs_cb_promise_trace trace)1808 static inline bool afs_clear_cb_promise(struct afs_vnode *vnode,
1809 enum afs_cb_promise_trace trace)
1810 {
1811 trace_afs_cb_promise(vnode, trace);
1812 return atomic64_xchg(&vnode->cb_expires_at, AFS_NO_CB_PROMISE) != AFS_NO_CB_PROMISE;
1813 }
1814
1815 /*
1816 * Mark a directory as being invalid.
1817 */
afs_invalidate_dir(struct afs_vnode * dvnode,enum afs_dir_invalid_trace trace)1818 static inline void afs_invalidate_dir(struct afs_vnode *dvnode,
1819 enum afs_dir_invalid_trace trace)
1820 {
1821 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1822 trace_afs_dir_invalid(dvnode, trace);
1823 afs_stat_v(dvnode, n_inval);
1824 }
1825 }
1826
1827 /*****************************************************************************/
1828 /*
1829 * debug tracing
1830 */
1831 extern unsigned afs_debug;
1832
1833 #define dbgprintk(FMT,...) \
1834 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1835
1836 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1837 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1838 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1839
1840
1841 #if defined(__KDEBUG)
1842 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1843 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1844 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1845
1846 #elif defined(CONFIG_AFS_DEBUG)
1847 #define AFS_DEBUG_KENTER 0x01
1848 #define AFS_DEBUG_KLEAVE 0x02
1849 #define AFS_DEBUG_KDEBUG 0x04
1850
1851 #define _enter(FMT,...) \
1852 do { \
1853 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1854 kenter(FMT,##__VA_ARGS__); \
1855 } while (0)
1856
1857 #define _leave(FMT,...) \
1858 do { \
1859 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1860 kleave(FMT,##__VA_ARGS__); \
1861 } while (0)
1862
1863 #define _debug(FMT,...) \
1864 do { \
1865 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1866 kdebug(FMT,##__VA_ARGS__); \
1867 } while (0)
1868
1869 #else
1870 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1871 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1872 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1873 #endif
1874
1875 /*
1876 * debug assertion checking
1877 */
1878 #if 1 // defined(__KDEBUGALL)
1879
1880 #define ASSERT(X) \
1881 do { \
1882 if (unlikely(!(X))) { \
1883 printk(KERN_ERR "\n"); \
1884 printk(KERN_ERR "AFS: Assertion failed\n"); \
1885 BUG(); \
1886 } \
1887 } while(0)
1888
1889 #define ASSERTCMP(X, OP, Y) \
1890 do { \
1891 if (unlikely(!((X) OP (Y)))) { \
1892 printk(KERN_ERR "\n"); \
1893 printk(KERN_ERR "AFS: Assertion failed\n"); \
1894 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1895 (unsigned long)(X), (unsigned long)(Y)); \
1896 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1897 (unsigned long)(X), (unsigned long)(Y)); \
1898 BUG(); \
1899 } \
1900 } while(0)
1901
1902 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1903 do { \
1904 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1905 printk(KERN_ERR "\n"); \
1906 printk(KERN_ERR "AFS: Assertion failed\n"); \
1907 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1908 (unsigned long)(L), (unsigned long)(N), \
1909 (unsigned long)(H)); \
1910 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1911 (unsigned long)(L), (unsigned long)(N), \
1912 (unsigned long)(H)); \
1913 BUG(); \
1914 } \
1915 } while(0)
1916
1917 #define ASSERTIF(C, X) \
1918 do { \
1919 if (unlikely((C) && !(X))) { \
1920 printk(KERN_ERR "\n"); \
1921 printk(KERN_ERR "AFS: Assertion failed\n"); \
1922 BUG(); \
1923 } \
1924 } while(0)
1925
1926 #define ASSERTIFCMP(C, X, OP, Y) \
1927 do { \
1928 if (unlikely((C) && !((X) OP (Y)))) { \
1929 printk(KERN_ERR "\n"); \
1930 printk(KERN_ERR "AFS: Assertion failed\n"); \
1931 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1932 (unsigned long)(X), (unsigned long)(Y)); \
1933 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1934 (unsigned long)(X), (unsigned long)(Y)); \
1935 BUG(); \
1936 } \
1937 } while(0)
1938
1939 #else
1940
1941 #define ASSERT(X) \
1942 do { \
1943 } while(0)
1944
1945 #define ASSERTCMP(X, OP, Y) \
1946 do { \
1947 } while(0)
1948
1949 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1950 do { \
1951 } while(0)
1952
1953 #define ASSERTIF(C, X) \
1954 do { \
1955 } while(0)
1956
1957 #define ASSERTIFCMP(C, X, OP, Y) \
1958 do { \
1959 } while(0)
1960
1961 #endif /* __KDEBUGALL */
1962