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