1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* internal AFS stuff
3 *
4 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/compiler.h>
9 #include <linux/kernel.h>
10 #include <linux/ktime.h>
11 #include <linux/fs.h>
12 #include <linux/filelock.h>
13 #include <linux/pagemap.h>
14 #include <linux/rxrpc.h>
15 #include <linux/key.h>
16 #include <linux/workqueue.h>
17 #include <linux/sched.h>
18 #include <linux/fscache.h>
19 #include <linux/backing-dev.h>
20 #include <linux/uuid.h>
21 #include <linux/mm_types.h>
22 #include <linux/dns_resolver.h>
23 #include <net/net_namespace.h>
24 #include <net/netns/generic.h>
25 #include <net/sock.h>
26 #include <net/af_rxrpc.h>
27
28 #include "afs.h"
29 #include "afs_vl.h"
30
31 #define AFS_CELL_MAX_ADDRS 15
32
33 struct pagevec;
34 struct afs_call;
35 struct afs_vnode;
36 struct afs_server_probe;
37
38 /*
39 * Partial file-locking emulation mode. (The problem being that AFS3 only
40 * allows whole-file locks and no upgrading/downgrading).
41 */
42 enum afs_flock_mode {
43 afs_flock_mode_unset,
44 afs_flock_mode_local, /* Local locking only */
45 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
46 afs_flock_mode_strict, /* Always get a server lock for a partial lock */
47 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
48 };
49
50 struct afs_fs_context {
51 bool force; /* T to force cell type */
52 bool autocell; /* T if set auto mount operation */
53 bool dyn_root; /* T if dynamic root */
54 bool no_cell; /* T if the source is "none" (for dynroot) */
55 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
56 afs_voltype_t type; /* type of volume requested */
57 unsigned int volnamesz; /* size of volume name */
58 const char *volname; /* name of volume to mount */
59 struct afs_net *net; /* the AFS net namespace stuff */
60 struct afs_cell *cell; /* cell in which to find volume */
61 struct afs_volume *volume; /* volume record */
62 struct key *key; /* key to use for secure mounting */
63 };
64
65 enum afs_call_state {
66 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
67 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
68 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
69 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
70 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
71 AFS_CALL_SV_REPLYING, /* Server: Replying */
72 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
73 AFS_CALL_COMPLETE, /* Completed or failed */
74 };
75
76 /*
77 * Address preferences.
78 */
79 struct afs_addr_preference {
80 union {
81 struct in_addr ipv4_addr; /* AF_INET address to compare against */
82 struct in6_addr ipv6_addr; /* AF_INET6 address to compare against */
83 };
84 sa_family_t family; /* Which address to use */
85 u16 prio; /* Priority */
86 u8 subnet_mask; /* How many bits to compare */
87 };
88
89 struct afs_addr_preference_list {
90 struct rcu_head rcu;
91 u16 version; /* Incremented when prefs list changes */
92 u8 ipv6_off; /* Offset of IPv6 addresses */
93 u8 nr; /* Number of addresses in total */
94 u8 max_prefs; /* Number of prefs allocated */
95 struct afs_addr_preference prefs[] __counted_by(max_prefs);
96 };
97
98 struct afs_address {
99 struct rxrpc_peer *peer;
100 short last_error; /* Last error from this address */
101 u16 prio; /* Address priority */
102 };
103
104 /*
105 * List of server addresses.
106 */
107 struct afs_addr_list {
108 struct rcu_head rcu;
109 refcount_t usage;
110 u32 version; /* Version */
111 unsigned int debug_id;
112 unsigned int addr_pref_version; /* Version of address preference list */
113 unsigned char max_addrs;
114 unsigned char nr_addrs;
115 unsigned char preferred; /* Preferred address */
116 unsigned char nr_ipv4; /* Number of IPv4 addresses */
117 enum dns_record_source source:8;
118 enum dns_lookup_status status:8;
119 unsigned long probe_failed; /* Mask of addrs that failed locally/ICMP */
120 unsigned long responded; /* Mask of addrs that responded */
121 struct afs_address addrs[] __counted_by(max_addrs);
122 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
123 };
124
125 /*
126 * a record of an in-progress RxRPC call
127 */
128 struct afs_call {
129 const struct afs_call_type *type; /* type of call */
130 wait_queue_head_t waitq; /* processes awaiting completion */
131 struct work_struct async_work; /* async I/O processor */
132 struct work_struct work; /* actual work processor */
133 struct work_struct free_work; /* Deferred free processor */
134 struct rxrpc_call *rxcall; /* RxRPC call handle */
135 struct rxrpc_peer *peer; /* Remote endpoint */
136 struct key *key; /* security for this call */
137 struct afs_net *net; /* The network namespace */
138 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
139 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
140 void *request; /* request data (first part) */
141 size_t iov_len; /* Size of *iter to be used */
142 struct iov_iter def_iter; /* Default buffer/data iterator */
143 struct iov_iter *write_iter; /* Iterator defining write to be made */
144 struct iov_iter *iter; /* Iterator currently in use */
145 union { /* Convenience for ->def_iter */
146 struct kvec kvec[1];
147 struct bio_vec bvec[1];
148 };
149 void *buffer; /* reply receive buffer */
150 union {
151 struct afs_endpoint_state *probe;
152 struct afs_addr_list *vl_probe;
153 struct afs_addr_list *ret_alist;
154 struct afs_vldb_entry *ret_vldb;
155 char *ret_str;
156 };
157 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */
158 unsigned char probe_index; /* Address in ->probe_alist */
159 struct afs_operation *op;
160 unsigned int server_index;
161 refcount_t ref;
162 enum afs_call_state state;
163 spinlock_t state_lock;
164 int error; /* error code */
165 u32 abort_code; /* Remote abort ID or 0 */
166 unsigned long long remaining; /* How much is left to receive */
167 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
168 unsigned request_size; /* size of request data */
169 unsigned reply_max; /* maximum size of reply */
170 unsigned count2; /* count used in unmarshalling */
171 unsigned char unmarshall; /* unmarshalling phase */
172 bool drop_ref; /* T if need to drop ref for incoming call */
173 bool need_attention; /* T if RxRPC poked us */
174 bool async; /* T if asynchronous */
175 bool upgrade; /* T to request service upgrade */
176 bool intr; /* T if interruptible */
177 bool unmarshalling_error; /* T if an unmarshalling error occurred */
178 bool responded; /* Got a response from the call (may be abort) */
179 u16 service_id; /* Actual service ID (after upgrade) */
180 unsigned int debug_id; /* Trace ID */
181 u32 operation_ID; /* operation ID for an incoming call */
182 u32 count; /* count for use in unmarshalling */
183 union { /* place to extract temporary data */
184 struct {
185 __be32 tmp_u;
186 __be32 tmp;
187 } __attribute__((packed));
188 __be64 tmp64;
189 };
190 ktime_t issue_time; /* Time of issue of operation */
191 };
192
193 struct afs_call_type {
194 const char *name;
195 unsigned int op; /* Really enum afs_fs_operation */
196
197 /* deliver request or reply data to an call
198 * - returning an error will cause the call to be aborted
199 */
200 int (*deliver)(struct afs_call *call);
201
202 /* clean up a call */
203 void (*destructor)(struct afs_call *call);
204
205 /* Async receive processing function */
206 void (*async_rx)(struct work_struct *work);
207
208 /* Work function */
209 void (*work)(struct work_struct *work);
210
211 /* Call done function (gets called immediately on success or failure) */
212 void (*done)(struct afs_call *call);
213
214 /* Handle a call being immediately cancelled. */
215 void (*immediate_cancel)(struct afs_call *call);
216 };
217
218 /*
219 * Key available for writeback on a file.
220 */
221 struct afs_wb_key {
222 refcount_t usage;
223 struct key *key;
224 struct list_head vnode_link; /* Link in vnode->wb_keys */
225 };
226
227 /*
228 * AFS open file information record. Pointed to by file->private_data.
229 */
230 struct afs_file {
231 struct key *key; /* The key this file was opened with */
232 struct afs_wb_key *wb; /* Writeback key record for this file */
233 };
234
afs_file_key(struct file * file)235 static inline struct key *afs_file_key(struct file *file)
236 {
237 struct afs_file *af = file->private_data;
238
239 return af->key;
240 }
241
242 /*
243 * AFS superblock private data
244 * - there's one superblock per volume
245 */
246 struct afs_super_info {
247 struct net *net_ns; /* Network namespace */
248 struct afs_cell *cell; /* The cell in which the volume resides */
249 struct afs_volume *volume; /* volume record */
250 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
251 bool dyn_root; /* True if dynamic root */
252 };
253
AFS_FS_S(struct super_block * sb)254 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
255 {
256 return sb->s_fs_info;
257 }
258
259 extern struct file_system_type afs_fs_type;
260
261 /*
262 * Set of substitutes for @sys.
263 */
264 struct afs_sysnames {
265 #define AFS_NR_SYSNAME 16
266 char *subs[AFS_NR_SYSNAME];
267 refcount_t usage;
268 unsigned short nr;
269 char blank[1];
270 };
271
272 /*
273 * AFS network namespace record.
274 */
275 struct afs_net {
276 struct net *net; /* Backpointer to the owning net namespace */
277 struct afs_uuid uuid;
278 bool live; /* F if this namespace is being removed */
279
280 /* AF_RXRPC I/O stuff */
281 struct socket *socket;
282 struct afs_call *spare_incoming_call;
283 struct work_struct charge_preallocation_work;
284 struct mutex socket_mutex;
285 atomic_t nr_outstanding_calls;
286 atomic_t nr_superblocks;
287
288 /* Cell database */
289 struct rb_root cells;
290 struct afs_cell *ws_cell;
291 struct work_struct cells_manager;
292 struct timer_list cells_timer;
293 atomic_t cells_outstanding;
294 struct rw_semaphore cells_lock;
295 struct mutex cells_alias_lock;
296
297 struct mutex proc_cells_lock;
298 struct hlist_head proc_cells;
299
300 /* Known servers. Theoretically each fileserver can only be in one
301 * cell, but in practice, people create aliases and subsets and there's
302 * no easy way to distinguish them.
303 */
304 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */
305 struct rb_root fs_servers; /* afs_server (by server UUID or address) */
306 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
307 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
308 struct hlist_head fs_proc; /* procfs servers list */
309
310 struct hlist_head fs_addresses; /* afs_server (by lowest IPv6 addr) */
311 seqlock_t fs_addr_lock; /* For fs_addresses[46] */
312
313 struct work_struct fs_manager;
314 struct timer_list fs_timer;
315
316 struct work_struct fs_prober;
317 struct timer_list fs_probe_timer;
318 atomic_t servers_outstanding;
319
320 /* File locking renewal management */
321 struct mutex lock_manager_mutex;
322
323 /* Misc */
324 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
325 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
326 struct afs_sysnames *sysnames;
327 rwlock_t sysnames_lock;
328 struct afs_addr_preference_list __rcu *address_prefs;
329 u16 address_pref_version;
330
331 /* Statistics counters */
332 atomic_t n_lookup; /* Number of lookups done */
333 atomic_t n_reval; /* Number of dentries needing revalidation */
334 atomic_t n_inval; /* Number of invalidations by the server */
335 atomic_t n_relpg; /* Number of invalidations by release_folio */
336 atomic_t n_read_dir; /* Number of directory pages read */
337 atomic_t n_dir_cr; /* Number of directory entry creation edits */
338 atomic_t n_dir_rm; /* Number of directory entry removal edits */
339 atomic_t n_stores; /* Number of store ops */
340 atomic_long_t n_store_bytes; /* Number of bytes stored */
341 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
342 atomic_t n_fetches; /* Number of data fetch ops */
343 };
344
345 extern const char afs_init_sysname[];
346
347 enum afs_cell_state {
348 AFS_CELL_UNSET,
349 AFS_CELL_ACTIVATING,
350 AFS_CELL_ACTIVE,
351 AFS_CELL_DEACTIVATING,
352 AFS_CELL_INACTIVE,
353 AFS_CELL_FAILED,
354 AFS_CELL_REMOVED,
355 };
356
357 /*
358 * AFS cell record.
359 *
360 * This is a tricky concept to get right as it is possible to create aliases
361 * simply by pointing AFSDB/SRV records for two names at the same set of VL
362 * servers; it is also possible to do things like setting up two sets of VL
363 * servers, one of which provides a superset of the volumes provided by the
364 * other (for internal/external division, for example).
365 *
366 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
367 * servers and (b) a cell's name is used by the client to select the key to use
368 * for authentication and encryption. The cell name is not typically used in
369 * the protocol.
370 *
371 * Two cells are determined to be aliases if they have an explicit alias (YFS
372 * only), share any VL servers in common or have at least one volume in common.
373 * "In common" means that the address list of the VL servers or the fileservers
374 * share at least one endpoint.
375 */
376 struct afs_cell {
377 union {
378 struct rcu_head rcu;
379 struct rb_node net_node; /* Node in net->cells */
380 };
381 struct afs_net *net;
382 struct afs_cell *alias_of; /* The cell this is an alias of */
383 struct afs_volume *root_volume; /* The root.cell volume if there is one */
384 struct key *anonymous_key; /* anonymous user key for this cell */
385 struct work_struct manager; /* Manager for init/deinit/dns */
386 struct hlist_node proc_link; /* /proc cell list link */
387 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
388 time64_t last_inactive; /* Time of last drop of usage count */
389 refcount_t ref; /* Struct refcount */
390 atomic_t active; /* Active usage counter */
391 unsigned long flags;
392 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
393 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
394 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
395 enum afs_cell_state state;
396 short error;
397 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
398 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
399 unsigned int dns_lookup_count; /* Counter of DNS lookups */
400 unsigned int debug_id;
401
402 /* The volumes belonging to this cell */
403 struct rw_semaphore vs_lock; /* Lock for server->volumes */
404 struct rb_root volumes; /* Tree of volumes on this server */
405 struct hlist_head proc_volumes; /* procfs volume list */
406 seqlock_t volume_lock; /* For volumes */
407
408 /* Active fileserver interaction state. */
409 struct rb_root fs_servers; /* afs_server (by server UUID) */
410 seqlock_t fs_lock; /* For fs_servers */
411
412 /* VL server list. */
413 rwlock_t vl_servers_lock; /* Lock on vl_servers */
414 struct afs_vlserver_list __rcu *vl_servers;
415
416 u8 name_len; /* Length of name */
417 char *name; /* Cell name, case-flattened and NUL-padded */
418 };
419
420 /*
421 * Volume Location server record.
422 */
423 struct afs_vlserver {
424 struct rcu_head rcu;
425 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
426 unsigned long flags;
427 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
428 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
429 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
430 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
431 rwlock_t lock; /* Lock on addresses */
432 refcount_t ref;
433 unsigned int rtt; /* Server's current RTT in uS */
434 unsigned int debug_id;
435
436 /* Probe state */
437 wait_queue_head_t probe_wq;
438 atomic_t probe_outstanding;
439 spinlock_t probe_lock;
440 struct {
441 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
442 u32 abort_code;
443 short error;
444 unsigned short flags;
445 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
446 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
447 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
448 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
449 } probe;
450
451 u16 service_id; /* Service ID we're using */
452 u16 port;
453 u16 name_len; /* Length of name */
454 char name[]; /* Server name, case-flattened */
455 };
456
457 /*
458 * Weighted list of Volume Location servers.
459 */
460 struct afs_vlserver_entry {
461 u16 priority; /* Preference (as SRV) */
462 u16 weight; /* Weight (as SRV) */
463 enum dns_record_source source:8;
464 enum dns_lookup_status status:8;
465 struct afs_vlserver *server;
466 };
467
468 struct afs_vlserver_list {
469 struct rcu_head rcu;
470 refcount_t ref;
471 u8 nr_servers;
472 u8 index; /* Server currently in use */
473 u8 preferred; /* Preferred server */
474 enum dns_record_source source:8;
475 enum dns_lookup_status status:8;
476 rwlock_t lock;
477 struct afs_vlserver_entry servers[];
478 };
479
480 /*
481 * Cached VLDB entry.
482 *
483 * This is pointed to by cell->vldb_entries, indexed by name.
484 */
485 struct afs_vldb_entry {
486 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
487
488 unsigned long flags;
489 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
490 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
491 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
492 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
493 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
494
495 uuid_t fs_server[AFS_NMAXNSERVERS];
496 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
497 u8 fs_mask[AFS_NMAXNSERVERS];
498 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
499 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
500 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
501 u8 vlsf_flags[AFS_NMAXNSERVERS];
502 short error;
503 u8 nr_servers; /* Number of server records */
504 u8 name_len;
505 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
506 };
507
508 /*
509 * Fileserver endpoint state. The records the addresses of a fileserver's
510 * endpoints and the state and result of a round of probing on them. This
511 * allows the rotation algorithm to access those results without them being
512 * erased by a subsequent round of probing.
513 */
514 struct afs_endpoint_state {
515 struct rcu_head rcu;
516 struct afs_addr_list *addresses; /* The addresses being probed */
517 unsigned long responsive_set; /* Bitset of responsive endpoints */
518 unsigned long failed_set; /* Bitset of endpoints we failed to probe */
519 refcount_t ref;
520 unsigned int server_id; /* Debug ID of server */
521 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */
522 atomic_t nr_probing; /* Number of outstanding probes */
523 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
524 s32 abort_code;
525 short error;
526 unsigned long flags;
527 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */
528 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */
529 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */
530 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */
531 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */
532 };
533
534 /*
535 * Record of fileserver with which we're actively communicating.
536 */
537 struct afs_server {
538 struct rcu_head rcu;
539 union {
540 uuid_t uuid; /* Server ID */
541 struct afs_uuid _uuid;
542 };
543
544 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
545 struct rb_node uuid_rb; /* Link in net->fs_servers */
546 struct afs_server __rcu *uuid_next; /* Next server with same UUID */
547 struct afs_server *uuid_prev; /* Previous server with same UUID */
548 struct list_head probe_link; /* Link in net->fs_probe_list */
549 struct hlist_node addr_link; /* Link in net->fs_addresses6 */
550 struct hlist_node proc_link; /* Link in net->fs_proc */
551 struct list_head volumes; /* RCU list of afs_server_entry objects */
552 struct afs_server *gc_next; /* Next server in manager's list */
553 time64_t unuse_time; /* Time at which last unused */
554 unsigned long flags;
555 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
556 #define AFS_SERVER_FL_UPDATING 1
557 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
558 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */
559 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */
560 #define AFS_SERVER_FL_VL_FAIL 6 /* 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 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 unsigned int rtt; /* Server's current RTT in uS */
571 unsigned int debug_id; /* Debugging ID for traces */
572
573 /* file service access */
574 rwlock_t fs_lock; /* access lock */
575
576 /* Probe state */
577 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
578 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
579 wait_queue_head_t probe_wq;
580 unsigned int probe_counter; /* Number of probes issued */
581 spinlock_t probe_lock;
582 };
583
584 enum afs_ro_replicating {
585 AFS_RO_NOT_REPLICATING, /* Not doing replication */
586 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */
587 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */
588 } __mode(byte);
589
590 /*
591 * Replaceable volume server list.
592 */
593 struct afs_server_entry {
594 struct afs_server *server;
595 struct afs_volume *volume;
596 struct list_head slink; /* Link in server->volumes */
597 time64_t cb_expires_at; /* Time at which volume-level callback expires */
598 unsigned long flags;
599 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */
600 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */
601 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */
602 };
603
604 struct afs_server_list {
605 struct rcu_head rcu;
606 refcount_t usage;
607 bool attached; /* T if attached to servers */
608 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */
609 unsigned char nr_servers;
610 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
611 unsigned int seq; /* Set to ->servers_seq when installed */
612 rwlock_t lock;
613 struct afs_server_entry servers[];
614 };
615
616 /*
617 * Live AFS volume management.
618 */
619 struct afs_volume {
620 struct rcu_head rcu;
621 afs_volid_t vid; /* The volume ID of this volume */
622 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
623 refcount_t ref;
624 time64_t update_at; /* Time at which to next update */
625 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
626 struct rb_node cell_node; /* Link in cell->volumes */
627 struct hlist_node proc_link; /* Link in cell->proc_volumes */
628 struct super_block __rcu *sb; /* Superblock on which inodes reside */
629 struct work_struct destructor; /* Deferred destructor */
630 unsigned long flags;
631 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
632 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
633 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
634 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
635 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */
636 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */
637 #ifdef CONFIG_AFS_FSCACHE
638 struct fscache_volume *cache; /* Caching cookie */
639 #endif
640 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
641 rwlock_t servers_lock; /* Lock for ->servers */
642 unsigned int servers_seq; /* Incremented each time ->servers changes */
643
644 /* RO release tracking */
645 struct mutex volsync_lock; /* Time/state evaluation lock */
646 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */
647 time64_t update_time; /* Volume update time (or TIME64_MIN) */
648
649 /* Callback management */
650 struct mutex cb_check_lock; /* Lock to control race to check after v_break */
651 time64_t cb_expires_at; /* Earliest volume callback expiry time */
652 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */
653 atomic_t cb_v_break; /* Volume-break event counter. */
654 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */
655 atomic_t cb_scrub; /* Scrub-all-data event counter. */
656 rwlock_t cb_v_break_lock;
657 struct rw_semaphore open_mmaps_lock;
658 struct list_head open_mmaps; /* List of vnodes that are mmapped */
659
660 afs_voltype_t type; /* type of volume */
661 char type_force; /* force volume type (suppress R/O -> R/W) */
662 u8 name_len;
663 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
664 };
665
666 enum afs_lock_state {
667 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
668 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
669 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
670 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
671 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
672 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
673 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
674 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
675 };
676
677 /*
678 * AFS inode private data.
679 *
680 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
681 * leak from one inode to another.
682 */
683 struct afs_vnode {
684 struct netfs_inode netfs; /* Netfslib context and vfs inode */
685 struct afs_volume *volume; /* volume on which vnode resides */
686 struct afs_fid fid; /* the file identifier for this inode */
687 struct afs_file_status status; /* AFS status info for this file */
688 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
689 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
690 struct list_head io_lock_waiters; /* Threads waiting for the I/O lock */
691 struct rw_semaphore validate_lock; /* lock for validating this vnode */
692 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
693 struct key *silly_key; /* Silly rename key */
694 spinlock_t wb_lock; /* lock for wb_keys */
695 spinlock_t lock; /* waitqueue/flags lock */
696 unsigned long flags;
697 #define AFS_VNODE_IO_LOCK 0 /* Set if the I/O serialisation lock is held */
698 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
699 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
700 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
701 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
702 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
703 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
704 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
705 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
706 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
707 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
708 #define AFS_VNODE_DIR_READ 11 /* Set if we've read a dir's contents */
709
710 struct folio_queue *directory; /* Directory contents */
711 struct list_head wb_keys; /* List of keys available for writeback */
712 struct list_head pending_locks; /* locks waiting to be granted */
713 struct list_head granted_locks; /* locks granted on this file */
714 struct delayed_work lock_work; /* work to be done in locking */
715 struct key *lock_key; /* Key to be used in lock ops */
716 ktime_t locked_at; /* Time at which lock obtained */
717 enum afs_lock_state lock_state : 8;
718 afs_lock_type_t lock_type : 8;
719 unsigned int directory_size; /* Amount of space in ->directory */
720
721 /* outstanding callback notification on this file */
722 struct work_struct cb_work; /* Work for mmap'd files */
723 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
724 void *cb_server; /* Server with callback/filelock */
725 atomic_t cb_nr_mmap; /* Number of mmaps */
726 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */
727 unsigned int cb_scrub; /* Scrub counter on ->volume */
728 unsigned int cb_break; /* Break counter on vnode */
729 unsigned int cb_v_check; /* Break check counter on ->volume */
730 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
731
732 atomic64_t cb_expires_at; /* time at which callback expires */
733 #define AFS_NO_CB_PROMISE TIME64_MIN
734 };
735
afs_vnode_cache(struct afs_vnode * vnode)736 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
737 {
738 #ifdef CONFIG_AFS_FSCACHE
739 return netfs_i_cookie(&vnode->netfs);
740 #else
741 return NULL;
742 #endif
743 }
744
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)745 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
746 struct fscache_cookie *cookie)
747 {
748 #ifdef CONFIG_AFS_FSCACHE
749 vnode->netfs.cache = cookie;
750 if (cookie)
751 mapping_set_release_always(vnode->netfs.inode.i_mapping);
752 #endif
753 }
754
755 /*
756 * cached security record for one user's attempt to access a vnode
757 */
758 struct afs_permit {
759 struct key *key; /* RxRPC ticket holding a security context */
760 afs_access_t access; /* CallerAccess value for this key */
761 };
762
763 /*
764 * Immutable cache of CallerAccess records from attempts to access vnodes.
765 * These may be shared between multiple vnodes.
766 */
767 struct afs_permits {
768 struct rcu_head rcu;
769 struct hlist_node hash_node; /* Link in hash */
770 unsigned long h; /* Hash value for this permit list */
771 refcount_t usage;
772 unsigned short nr_permits; /* Number of records */
773 bool invalidated; /* Invalidated due to key change */
774 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
775 };
776
777 /*
778 * Error prioritisation and accumulation.
779 */
780 struct afs_error {
781 s32 abort_code; /* Cumulative abort code */
782 short error; /* Cumulative error */
783 bool responded; /* T if server responded */
784 bool aborted; /* T if ->error is from an abort */
785 };
786
787 /*
788 * Cursor for iterating over a set of volume location servers.
789 */
790 struct afs_vl_cursor {
791 struct afs_cell *cell; /* The cell we're querying */
792 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
793 struct afs_vlserver *server; /* Server on which this resides */
794 struct afs_addr_list *alist; /* Current address list (pins ref) */
795 struct key *key; /* Key for the server */
796 unsigned long untried_servers; /* Bitmask of untried servers */
797 unsigned long addr_tried; /* Tried addresses */
798 struct afs_error cumul_error; /* Cumulative error */
799 unsigned int debug_id;
800 s32 call_abort_code;
801 short call_error; /* Error from single call */
802 short server_index; /* Current server */
803 signed char addr_index; /* Current address */
804 unsigned short flags;
805 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
806 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
807 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
808 short nr_iterations; /* Number of server iterations */
809 bool call_responded; /* T if the current address responded */
810 };
811
812 /*
813 * Fileserver state tracking for an operation. An array of these is kept,
814 * indexed by server index.
815 */
816 struct afs_server_state {
817 /* Tracking of fileserver probe state. Other operations may interfere
818 * by probing a fileserver when accessing other volumes.
819 */
820 unsigned int probe_seq;
821 unsigned long untried_addrs; /* Addresses we haven't tried yet */
822 struct wait_queue_entry probe_waiter;
823 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
824 };
825
826 /*
827 * Fileserver operation methods.
828 */
829 struct afs_operation_ops {
830 void (*issue_afs_rpc)(struct afs_operation *op);
831 void (*issue_yfs_rpc)(struct afs_operation *op);
832 void (*success)(struct afs_operation *op);
833 void (*aborted)(struct afs_operation *op);
834 void (*failed)(struct afs_operation *op);
835 void (*edit_dir)(struct afs_operation *op);
836 void (*put)(struct afs_operation *op);
837 };
838
839 struct afs_vnode_param {
840 struct afs_vnode *vnode;
841 struct afs_fid fid; /* Fid to access */
842 struct afs_status_cb scb; /* Returned status and callback promise */
843 afs_dataversion_t dv_before; /* Data version before the call */
844 unsigned int cb_break_before; /* cb_break before the call */
845 u8 dv_delta; /* Expected change in data version */
846 bool put_vnode:1; /* T if we have a ref on the vnode */
847 bool need_io_lock:1; /* T if we need the I/O lock on this */
848 bool update_ctime:1; /* Need to update the ctime */
849 bool set_size:1; /* Must update i_size */
850 bool op_unlinked:1; /* True if file was unlinked by op */
851 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
852 bool modification:1; /* Set if the content gets modified */
853 };
854
855 /*
856 * Fileserver operation wrapper, handling server and address rotation
857 * asynchronously. May make simultaneous calls to multiple servers.
858 */
859 struct afs_operation {
860 struct afs_net *net; /* Network namespace */
861 struct key *key; /* Key for the cell */
862 const struct afs_call_type *type; /* Type of call done */
863 const struct afs_operation_ops *ops;
864
865 /* Parameters/results for the operation */
866 struct afs_volume *volume; /* Volume being accessed */
867 struct afs_vnode_param file[2];
868 struct afs_vnode_param *more_files;
869 struct afs_volsync pre_volsync; /* Volsync before op */
870 struct afs_volsync volsync; /* Volsync returned by op */
871 struct dentry *dentry; /* Dentry to be altered */
872 struct dentry *dentry_2; /* Second dentry to be altered */
873 struct timespec64 mtime; /* Modification time to record */
874 struct timespec64 ctime; /* Change time to set */
875 struct afs_error cumul_error; /* Cumulative error */
876 short nr_files; /* Number of entries in file[], more_files */
877 unsigned int debug_id;
878
879 unsigned int cb_v_break; /* Volume break counter before op */
880
881 union {
882 struct {
883 int which; /* Which ->file[] to fetch for */
884 } fetch_status;
885 struct {
886 int reason; /* enum afs_edit_dir_reason */
887 mode_t mode;
888 const char *symlink;
889 } create;
890 struct {
891 bool need_rehash;
892 } unlink;
893 struct {
894 struct dentry *rehash;
895 struct dentry *tmp;
896 bool new_negative;
897 } rename;
898 struct {
899 struct netfs_io_subrequest *subreq;
900 } fetch;
901 struct {
902 afs_lock_type_t type;
903 } lock;
904 struct {
905 struct iov_iter *write_iter;
906 loff_t pos;
907 loff_t size;
908 loff_t i_size;
909 } store;
910 struct {
911 struct iattr *attr;
912 loff_t old_i_size;
913 } setattr;
914 struct afs_acl *acl;
915 struct yfs_acl *yacl;
916 struct {
917 struct afs_volume_status vs;
918 struct kstatfs *buf;
919 } volstatus;
920 };
921
922 /* Fileserver iteration state */
923 struct afs_server_list *server_list; /* Current server list (pins ref) */
924 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
925 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */
926 struct afs_server_state *server_states; /* States of the servers involved */
927 struct afs_call *call;
928 unsigned long untried_servers; /* Bitmask of untried servers */
929 unsigned long addr_tried; /* Tried addresses */
930 s32 call_abort_code; /* Abort code from single call */
931 short call_error; /* Error from single call */
932 short server_index; /* Current server */
933 short nr_iterations; /* Number of server iterations */
934 signed char addr_index; /* Current address */
935 bool call_responded; /* T if the current address responded */
936
937 unsigned int flags;
938 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
939 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
940 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
941 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
942 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
943 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
944 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
945 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
946 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
947 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
948 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
949 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
950 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
951 #define AFS_OPERATION_ASYNC 0x2000 /* Set if should run asynchronously */
952 };
953
954 /*
955 * Cache auxiliary data.
956 */
957 struct afs_vnode_cache_aux {
958 __be64 data_version;
959 } __packed;
960
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)961 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
962 struct afs_vnode_cache_aux *aux)
963 {
964 aux->data_version = cpu_to_be64(vnode->status.data_version);
965 }
966
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)967 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
968 {
969 struct afs_vnode_cache_aux aux;
970
971 afs_set_cache_aux(vnode, &aux);
972 fscache_invalidate(afs_vnode_cache(vnode), &aux,
973 i_size_read(&vnode->netfs.inode), flags);
974 }
975
976 /*
977 * Directory iteration management.
978 */
979 struct afs_dir_iter {
980 struct afs_vnode *dvnode;
981 union afs_xdr_dir_block *block;
982 struct folio_queue *fq;
983 unsigned int fpos;
984 int fq_slot;
985 unsigned int loop_check;
986 u8 nr_slots;
987 u8 bucket;
988 unsigned int prev_entry;
989 };
990
991 #include <trace/events/afs.h>
992
993 /*****************************************************************************/
994 /*
995 * addr_list.c
996 */
997 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
998 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
999 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
1000 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
1001 const char *, size_t, char,
1002 unsigned short, unsigned short);
1003 bool afs_addr_list_same(const struct afs_addr_list *a,
1004 const struct afs_addr_list *b);
1005 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
1006
1007 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1008 __be32 xdr, u16 port);
1009 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1010 __be32 *xdr, u16 port);
1011
1012 /*
1013 * addr_prefs.c
1014 */
1015 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1016 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1017 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
1018
1019 /*
1020 * callback.c
1021 */
1022 extern void afs_invalidate_mmap_work(struct work_struct *);
1023 extern void afs_init_callback_state(struct afs_server *);
1024 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1025 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1026 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1027
afs_calc_vnode_cb_break(struct afs_vnode * vnode)1028 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1029 {
1030 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1031 }
1032
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)1033 static inline bool afs_cb_is_broken(unsigned int cb_break,
1034 const struct afs_vnode *vnode)
1035 {
1036 return cb_break != (vnode->cb_break +
1037 atomic_read(&vnode->volume->cb_ro_snapshot) +
1038 atomic_read(&vnode->volume->cb_scrub));
1039 }
1040
1041 /*
1042 * cell.c
1043 */
1044 extern int afs_cell_init(struct afs_net *, const char *);
1045 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1046 enum afs_cell_trace);
1047 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1048 const char *, bool);
1049 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1050 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1051 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1052 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1053 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1054 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1055 extern void afs_manage_cells(struct work_struct *);
1056 extern void afs_cells_timer(struct timer_list *);
1057 extern void __net_exit afs_cell_purge(struct afs_net *);
1058
1059 /*
1060 * cmservice.c
1061 */
1062 extern bool afs_cm_incoming_call(struct afs_call *);
1063
1064 /*
1065 * dir.c
1066 */
1067 extern const struct file_operations afs_dir_file_operations;
1068 extern const struct inode_operations afs_dir_inode_operations;
1069 extern const struct address_space_operations afs_dir_aops;
1070 extern const struct dentry_operations afs_fs_dentry_operations;
1071
1072 ssize_t afs_read_single(struct afs_vnode *dvnode, struct file *file);
1073 ssize_t afs_read_dir(struct afs_vnode *dvnode, struct file *file)
1074 __acquires(&dvnode->validate_lock);
1075 extern void afs_d_release(struct dentry *);
1076 extern void afs_check_for_remote_deletion(struct afs_operation *);
1077 int afs_single_writepages(struct address_space *mapping,
1078 struct writeback_control *wbc);
1079
1080 /*
1081 * dir_edit.c
1082 */
1083 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1084 enum afs_edit_dir_reason);
1085 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1086 void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
1087 enum afs_edit_dir_reason why);
1088 void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode);
1089
1090 /*
1091 * dir_search.c
1092 */
1093 unsigned int afs_dir_hash_name(const struct qstr *name);
1094 bool afs_dir_init_iter(struct afs_dir_iter *iter, const struct qstr *name);
1095 union afs_xdr_dir_block *afs_dir_find_block(struct afs_dir_iter *iter, size_t block);
1096 int afs_dir_search_bucket(struct afs_dir_iter *iter, const struct qstr *name,
1097 struct afs_fid *_fid);
1098 int afs_dir_search(struct afs_vnode *dvnode, struct qstr *name,
1099 struct afs_fid *_fid, afs_dataversion_t *_dir_version);
1100
1101 /*
1102 * dir_silly.c
1103 */
1104 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1105 struct dentry *, struct key *);
1106 extern int afs_silly_iput(struct dentry *, struct inode *);
1107
1108 /*
1109 * dynroot.c
1110 */
1111 extern const struct inode_operations afs_dynroot_inode_operations;
1112 extern const struct dentry_operations afs_dynroot_dentry_operations;
1113
1114 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1115 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1116 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1117 extern int afs_dynroot_populate(struct super_block *);
1118 extern void afs_dynroot_depopulate(struct super_block *);
1119
1120 /*
1121 * file.c
1122 */
1123 extern const struct address_space_operations afs_file_aops;
1124 extern const struct inode_operations afs_file_inode_operations;
1125 extern const struct file_operations afs_file_operations;
1126 extern const struct afs_operation_ops afs_fetch_data_operation;
1127 extern const struct netfs_request_ops afs_req_ops;
1128
1129 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1130 extern void afs_put_wb_key(struct afs_wb_key *);
1131 extern int afs_open(struct inode *, struct file *);
1132 extern int afs_release(struct inode *, struct file *);
1133 void afs_fetch_data_async_rx(struct work_struct *work);
1134 void afs_fetch_data_immediate_cancel(struct afs_call *call);
1135
1136 /*
1137 * flock.c
1138 */
1139 extern struct workqueue_struct *afs_lock_manager;
1140
1141 extern void afs_lock_op_done(struct afs_call *);
1142 extern void afs_lock_work(struct work_struct *);
1143 extern void afs_lock_may_be_available(struct afs_vnode *);
1144 extern int afs_lock(struct file *, int, struct file_lock *);
1145 extern int afs_flock(struct file *, int, struct file_lock *);
1146
1147 /*
1148 * fsclient.c
1149 */
1150 extern void afs_fs_fetch_status(struct afs_operation *);
1151 extern void afs_fs_fetch_data(struct afs_operation *);
1152 extern void afs_fs_create_file(struct afs_operation *);
1153 extern void afs_fs_make_dir(struct afs_operation *);
1154 extern void afs_fs_remove_file(struct afs_operation *);
1155 extern void afs_fs_remove_dir(struct afs_operation *);
1156 extern void afs_fs_link(struct afs_operation *);
1157 extern void afs_fs_symlink(struct afs_operation *);
1158 extern void afs_fs_rename(struct afs_operation *);
1159 extern void afs_fs_store_data(struct afs_operation *);
1160 extern void afs_fs_setattr(struct afs_operation *);
1161 extern void afs_fs_get_volume_status(struct afs_operation *);
1162 extern void afs_fs_set_lock(struct afs_operation *);
1163 extern void afs_fs_extend_lock(struct afs_operation *);
1164 extern void afs_fs_release_lock(struct afs_operation *);
1165 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1166 struct afs_address *addr, struct key *key);
1167 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1168 struct afs_endpoint_state *estate, unsigned int addr_index,
1169 struct key *key);
1170 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1171
1172 struct afs_acl {
1173 u32 size;
1174 u8 data[] __counted_by(size);
1175 };
1176
1177 extern void afs_fs_fetch_acl(struct afs_operation *);
1178 extern void afs_fs_store_acl(struct afs_operation *);
1179
1180 /*
1181 * fs_operation.c
1182 */
1183 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1184 extern int afs_put_operation(struct afs_operation *);
1185 extern bool afs_begin_vnode_operation(struct afs_operation *);
1186 extern void afs_end_vnode_operation(struct afs_operation *op);
1187 extern void afs_wait_for_operation(struct afs_operation *);
1188 extern int afs_do_sync_operation(struct afs_operation *);
1189
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1190 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1191 struct afs_vnode *vnode)
1192 {
1193 op->file[n].vnode = vnode;
1194 op->file[n].need_io_lock = true;
1195 }
1196
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1197 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1198 const struct afs_fid *fid)
1199 {
1200 op->file[n].fid = *fid;
1201 }
1202
1203 /*
1204 * fs_probe.c
1205 */
1206 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1207 enum afs_estate_trace where);
1208 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1209 extern void afs_fileserver_probe_result(struct afs_call *);
1210 void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1211 struct afs_addr_list *new_addrs, struct key *key);
1212 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1213 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1214 extern void afs_fs_probe_dispatcher(struct work_struct *);
1215 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1216 unsigned long exclude, bool is_intr);
1217 extern void afs_fs_probe_cleanup(struct afs_net *);
1218
1219 /*
1220 * inode.c
1221 */
1222 extern const struct afs_operation_ops afs_fetch_status_operation;
1223
1224 void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op);
1225 const char *afs_get_link(struct dentry *dentry, struct inode *inode,
1226 struct delayed_call *callback);
1227 int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
1228 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1229 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1230 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1231 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1232 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1233 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1234 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
1235 struct kstat *, u32, unsigned int);
1236 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1237 extern void afs_evict_inode(struct inode *);
1238 extern int afs_drop_inode(struct inode *);
1239
1240 /*
1241 * main.c
1242 */
1243 extern struct workqueue_struct *afs_wq;
1244 extern int afs_net_id;
1245
afs_net(struct net * net)1246 static inline struct afs_net *afs_net(struct net *net)
1247 {
1248 return net_generic(net, afs_net_id);
1249 }
1250
afs_sb2net(struct super_block * sb)1251 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1252 {
1253 return afs_net(AFS_FS_S(sb)->net_ns);
1254 }
1255
afs_d2net(struct dentry * dentry)1256 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1257 {
1258 return afs_sb2net(dentry->d_sb);
1259 }
1260
afs_i2net(struct inode * inode)1261 static inline struct afs_net *afs_i2net(struct inode *inode)
1262 {
1263 return afs_sb2net(inode->i_sb);
1264 }
1265
afs_v2net(struct afs_vnode * vnode)1266 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1267 {
1268 return afs_i2net(&vnode->netfs.inode);
1269 }
1270
afs_sock2net(struct sock * sk)1271 static inline struct afs_net *afs_sock2net(struct sock *sk)
1272 {
1273 return net_generic(sock_net(sk), afs_net_id);
1274 }
1275
__afs_stat(atomic_t * s)1276 static inline void __afs_stat(atomic_t *s)
1277 {
1278 atomic_inc(s);
1279 }
1280
1281 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1282
1283 /*
1284 * misc.c
1285 */
1286 extern int afs_abort_to_error(u32);
1287 extern void afs_prioritise_error(struct afs_error *, int, u32);
1288
afs_op_nomem(struct afs_operation * op)1289 static inline void afs_op_nomem(struct afs_operation *op)
1290 {
1291 op->cumul_error.error = -ENOMEM;
1292 }
1293
afs_op_error(const struct afs_operation * op)1294 static inline int afs_op_error(const struct afs_operation *op)
1295 {
1296 return op->cumul_error.error;
1297 }
1298
afs_op_abort_code(const struct afs_operation * op)1299 static inline s32 afs_op_abort_code(const struct afs_operation *op)
1300 {
1301 return op->cumul_error.abort_code;
1302 }
1303
afs_op_set_error(struct afs_operation * op,int error)1304 static inline int afs_op_set_error(struct afs_operation *op, int error)
1305 {
1306 return op->cumul_error.error = error;
1307 }
1308
afs_op_accumulate_error(struct afs_operation * op,int error,s32 abort_code)1309 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1310 {
1311 afs_prioritise_error(&op->cumul_error, error, abort_code);
1312 }
1313
1314 /*
1315 * mntpt.c
1316 */
1317 extern const struct inode_operations afs_mntpt_inode_operations;
1318 extern const struct inode_operations afs_autocell_inode_operations;
1319 extern const struct file_operations afs_mntpt_file_operations;
1320
1321 extern struct vfsmount *afs_d_automount(struct path *);
1322 extern void afs_mntpt_kill_timer(void);
1323
1324 /*
1325 * proc.c
1326 */
1327 #ifdef CONFIG_PROC_FS
1328 extern int __net_init afs_proc_init(struct afs_net *);
1329 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1330 extern int afs_proc_cell_setup(struct afs_cell *);
1331 extern void afs_proc_cell_remove(struct afs_cell *);
1332 extern void afs_put_sysnames(struct afs_sysnames *);
1333 #else
afs_proc_init(struct afs_net * net)1334 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1335 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1336 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1337 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1338 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1339 #endif
1340
1341 /*
1342 * rotate.c
1343 */
1344 void afs_clear_server_states(struct afs_operation *op);
1345 extern bool afs_select_fileserver(struct afs_operation *);
1346 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1347
1348 /*
1349 * rxrpc.c
1350 */
1351 extern struct workqueue_struct *afs_async_calls;
1352
1353 extern int __net_init afs_open_socket(struct afs_net *);
1354 extern void __net_exit afs_close_socket(struct afs_net *);
1355 extern void afs_charge_preallocation(struct work_struct *);
1356 extern void afs_put_call(struct afs_call *);
1357 void afs_deferred_put_call(struct afs_call *call);
1358 void afs_make_call(struct afs_call *call, gfp_t gfp);
1359 void afs_deliver_to_call(struct afs_call *call);
1360 void afs_wait_for_call_to_complete(struct afs_call *call);
1361 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1362 const struct afs_call_type *,
1363 size_t, size_t);
1364 extern void afs_flat_call_destructor(struct afs_call *);
1365 extern void afs_send_empty_reply(struct afs_call *);
1366 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1367 extern int afs_extract_data(struct afs_call *, bool);
1368 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1369
afs_get_call(struct afs_call * call,enum afs_call_trace why)1370 static inline struct afs_call *afs_get_call(struct afs_call *call,
1371 enum afs_call_trace why)
1372 {
1373 int r;
1374
1375 __refcount_inc(&call->ref, &r);
1376
1377 trace_afs_call(call->debug_id, why, r + 1,
1378 atomic_read(&call->net->nr_outstanding_calls),
1379 __builtin_return_address(0));
1380 return call;
1381 }
1382
afs_see_call(struct afs_call * call,enum afs_call_trace why)1383 static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why)
1384 {
1385 int r = refcount_read(&call->ref);
1386
1387 trace_afs_call(call->debug_id, why, r,
1388 atomic_read(&call->net->nr_outstanding_calls),
1389 __builtin_return_address(0));
1390 }
1391
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1392 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1393 gfp_t gfp)
1394 {
1395 struct afs_addr_list *alist = op->estate->addresses;
1396
1397 op->call = call;
1398 op->type = call->type;
1399 call->op = op;
1400 call->key = op->key;
1401 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1402 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1403 call->service_id = op->server->service_id;
1404 afs_make_call(call, gfp);
1405 }
1406
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1407 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1408 {
1409 call->iov_len = size;
1410 call->kvec[0].iov_base = buf;
1411 call->kvec[0].iov_len = size;
1412 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1413 }
1414
afs_extract_to_tmp(struct afs_call * call)1415 static inline void afs_extract_to_tmp(struct afs_call *call)
1416 {
1417 call->iov_len = sizeof(call->tmp);
1418 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1419 }
1420
afs_extract_to_tmp64(struct afs_call * call)1421 static inline void afs_extract_to_tmp64(struct afs_call *call)
1422 {
1423 call->iov_len = sizeof(call->tmp64);
1424 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1425 }
1426
afs_extract_discard(struct afs_call * call,size_t size)1427 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1428 {
1429 call->iov_len = size;
1430 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1431 }
1432
afs_extract_to_buf(struct afs_call * call,size_t size)1433 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1434 {
1435 call->iov_len = size;
1436 afs_extract_begin(call, call->buffer, size);
1437 }
1438
afs_transfer_reply(struct afs_call * call)1439 static inline int afs_transfer_reply(struct afs_call *call)
1440 {
1441 return afs_extract_data(call, false);
1442 }
1443
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1444 static inline bool afs_check_call_state(struct afs_call *call,
1445 enum afs_call_state state)
1446 {
1447 return READ_ONCE(call->state) == state;
1448 }
1449
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1450 static inline bool afs_set_call_state(struct afs_call *call,
1451 enum afs_call_state from,
1452 enum afs_call_state to)
1453 {
1454 bool ok = false;
1455
1456 spin_lock_bh(&call->state_lock);
1457 if (call->state == from) {
1458 call->state = to;
1459 trace_afs_call_state(call, from, to, 0, 0);
1460 ok = true;
1461 }
1462 spin_unlock_bh(&call->state_lock);
1463 return ok;
1464 }
1465
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1466 static inline void afs_set_call_complete(struct afs_call *call,
1467 int error, u32 remote_abort)
1468 {
1469 enum afs_call_state state;
1470 bool ok = false;
1471
1472 spin_lock_bh(&call->state_lock);
1473 state = call->state;
1474 if (state != AFS_CALL_COMPLETE) {
1475 call->abort_code = remote_abort;
1476 call->error = error;
1477 call->state = AFS_CALL_COMPLETE;
1478 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1479 error, remote_abort);
1480 ok = true;
1481 }
1482 spin_unlock_bh(&call->state_lock);
1483 if (ok) {
1484 trace_afs_call_done(call);
1485
1486 /* Asynchronous calls have two refs to release - one from the alloc and
1487 * one queued with the work item - and we can't just deallocate the
1488 * call because the work item may be queued again.
1489 */
1490 if (call->drop_ref)
1491 afs_put_call(call);
1492 }
1493 }
1494
1495 /*
1496 * security.c
1497 */
1498 extern void afs_put_permits(struct afs_permits *);
1499 extern void afs_clear_permits(struct afs_vnode *);
1500 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1501 struct afs_status_cb *);
1502 extern struct key *afs_request_key(struct afs_cell *);
1503 extern struct key *afs_request_key_rcu(struct afs_cell *);
1504 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1505 extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1506 extern void __exit afs_clean_up_permit_cache(void);
1507
1508 /*
1509 * server.c
1510 */
1511 extern spinlock_t afs_server_peer_lock;
1512
1513 extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *);
1514 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1515 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1516 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1517 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1518 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1519 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1520 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1521 extern void afs_manage_servers(struct work_struct *);
1522 extern void afs_servers_timer(struct timer_list *);
1523 extern void afs_fs_probe_timer(struct timer_list *);
1524 extern void __net_exit afs_purge_servers(struct afs_net *);
1525 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1526
afs_inc_servers_outstanding(struct afs_net * net)1527 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1528 {
1529 atomic_inc(&net->servers_outstanding);
1530 }
1531
afs_dec_servers_outstanding(struct afs_net * net)1532 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1533 {
1534 if (atomic_dec_and_test(&net->servers_outstanding))
1535 wake_up_var(&net->servers_outstanding);
1536 }
1537
afs_is_probing_server(struct afs_server * server)1538 static inline bool afs_is_probing_server(struct afs_server *server)
1539 {
1540 return list_empty(&server->probe_link);
1541 }
1542
1543 /*
1544 * server_list.c
1545 */
afs_get_serverlist(struct afs_server_list * slist)1546 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1547 {
1548 refcount_inc(&slist->usage);
1549 return slist;
1550 }
1551
1552 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1553 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1554 struct key *key,
1555 struct afs_vldb_entry *vldb);
1556 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1557 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1558 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1559 struct afs_server_list *old);
1560 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1561
1562 /*
1563 * super.c
1564 */
1565 extern int __init afs_fs_init(void);
1566 extern void afs_fs_exit(void);
1567
1568 /*
1569 * validation.c
1570 */
1571 bool afs_check_validity(const struct afs_vnode *vnode);
1572 int afs_update_volume_state(struct afs_operation *op);
1573 int afs_validate(struct afs_vnode *vnode, struct key *key);
1574
1575 /*
1576 * vlclient.c
1577 */
1578 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1579 const char *, int);
1580 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1581 struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1582 struct afs_addr_list *alist,
1583 unsigned int addr_index,
1584 struct key *key,
1585 struct afs_vlserver *server,
1586 unsigned int server_index);
1587 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1588 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1589
1590 /*
1591 * vl_alias.c
1592 */
1593 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1594
1595 /*
1596 * vl_probe.c
1597 */
1598 extern void afs_vlserver_probe_result(struct afs_call *);
1599 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1600 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1601
1602 /*
1603 * vl_rotate.c
1604 */
1605 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1606 struct afs_cell *, struct key *);
1607 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1608 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1609 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1610
1611 /*
1612 * vlserver_list.c
1613 */
afs_get_vlserver(struct afs_vlserver * vlserver)1614 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1615 {
1616 refcount_inc(&vlserver->ref);
1617 return vlserver;
1618 }
1619
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1620 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1621 {
1622 if (vllist)
1623 refcount_inc(&vllist->ref);
1624 return vllist;
1625 }
1626
1627 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1628 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1629 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1630 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1631 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1632 const void *, size_t);
1633
1634 /*
1635 * volume.c
1636 */
1637 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1638 extern int afs_activate_volume(struct afs_volume *);
1639 extern void afs_deactivate_volume(struct afs_volume *);
1640 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1641 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1642 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1643 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1644
1645 /*
1646 * write.c
1647 */
1648 void afs_prepare_write(struct netfs_io_subrequest *subreq);
1649 void afs_issue_write(struct netfs_io_subrequest *subreq);
1650 void afs_begin_writeback(struct netfs_io_request *wreq);
1651 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
1652 extern int afs_writepages(struct address_space *, struct writeback_control *);
1653 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1654 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1655 extern void afs_prune_wb_keys(struct afs_vnode *);
1656
1657 /*
1658 * xattr.c
1659 */
1660 extern const struct xattr_handler * const afs_xattr_handlers[];
1661
1662 /*
1663 * yfsclient.c
1664 */
1665 extern void yfs_fs_fetch_data(struct afs_operation *);
1666 extern void yfs_fs_create_file(struct afs_operation *);
1667 extern void yfs_fs_make_dir(struct afs_operation *);
1668 extern void yfs_fs_remove_file2(struct afs_operation *);
1669 extern void yfs_fs_remove_file(struct afs_operation *);
1670 extern void yfs_fs_remove_dir(struct afs_operation *);
1671 extern void yfs_fs_link(struct afs_operation *);
1672 extern void yfs_fs_symlink(struct afs_operation *);
1673 extern void yfs_fs_rename(struct afs_operation *);
1674 extern void yfs_fs_store_data(struct afs_operation *);
1675 extern void yfs_fs_setattr(struct afs_operation *);
1676 extern void yfs_fs_get_volume_status(struct afs_operation *);
1677 extern void yfs_fs_set_lock(struct afs_operation *);
1678 extern void yfs_fs_extend_lock(struct afs_operation *);
1679 extern void yfs_fs_release_lock(struct afs_operation *);
1680 extern void yfs_fs_fetch_status(struct afs_operation *);
1681 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1682
1683 struct yfs_acl {
1684 struct afs_acl *acl; /* Dir/file/symlink ACL */
1685 struct afs_acl *vol_acl; /* Whole volume ACL */
1686 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1687 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1688 unsigned int flags;
1689 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1690 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1691 };
1692
1693 extern void yfs_free_opaque_acl(struct yfs_acl *);
1694 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1695 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1696
1697 /*
1698 * Miscellaneous inline functions.
1699 */
AFS_FS_I(struct inode * inode)1700 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1701 {
1702 return container_of(inode, struct afs_vnode, netfs.inode);
1703 }
1704
AFS_VNODE_TO_I(struct afs_vnode * vnode)1705 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1706 {
1707 return &vnode->netfs.inode;
1708 }
1709
1710 /*
1711 * Note that a dentry got changed. We need to set d_fsdata to the data version
1712 * number derived from the result of the operation. It doesn't matter if
1713 * d_fsdata goes backwards as we'll just revalidate.
1714 */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1715 static inline void afs_update_dentry_version(struct afs_operation *op,
1716 struct afs_vnode_param *dir_vp,
1717 struct dentry *dentry)
1718 {
1719 if (!op->cumul_error.error)
1720 dentry->d_fsdata =
1721 (void *)(unsigned long)dir_vp->scb.status.data_version;
1722 }
1723
1724 /*
1725 * Set the file size and block count. Estimate the number of 512 bytes blocks
1726 * used, rounded up to nearest 1K for consistency with other AFS clients.
1727 */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1728 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1729 {
1730 i_size_write(&vnode->netfs.inode, size);
1731 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1732 }
1733
1734 /*
1735 * Check for a conflicting operation on a directory that we just unlinked from.
1736 * If someone managed to sneak a link or an unlink in on the file we just
1737 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1738 */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1739 static inline void afs_check_dir_conflict(struct afs_operation *op,
1740 struct afs_vnode_param *dvp)
1741 {
1742 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1743 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1744 }
1745
afs_io_error(struct afs_call * call,enum afs_io_error where)1746 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1747 {
1748 trace_afs_io_error(call->debug_id, -EIO, where);
1749 return -EIO;
1750 }
1751
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1752 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1753 {
1754 trace_afs_file_error(vnode, -EIO, where);
1755 return -EIO;
1756 }
1757
1758 /*
1759 * Set the callback promise on a vnode.
1760 */
afs_set_cb_promise(struct afs_vnode * vnode,time64_t expires_at,enum afs_cb_promise_trace trace)1761 static inline void afs_set_cb_promise(struct afs_vnode *vnode, time64_t expires_at,
1762 enum afs_cb_promise_trace trace)
1763 {
1764 atomic64_set(&vnode->cb_expires_at, expires_at);
1765 trace_afs_cb_promise(vnode, trace);
1766 }
1767
1768 /*
1769 * Clear the callback promise on a vnode, returning true if it was promised.
1770 */
afs_clear_cb_promise(struct afs_vnode * vnode,enum afs_cb_promise_trace trace)1771 static inline bool afs_clear_cb_promise(struct afs_vnode *vnode,
1772 enum afs_cb_promise_trace trace)
1773 {
1774 trace_afs_cb_promise(vnode, trace);
1775 return atomic64_xchg(&vnode->cb_expires_at, AFS_NO_CB_PROMISE) != AFS_NO_CB_PROMISE;
1776 }
1777
1778 /*
1779 * Mark a directory as being invalid.
1780 */
afs_invalidate_dir(struct afs_vnode * dvnode,enum afs_dir_invalid_trace trace)1781 static inline void afs_invalidate_dir(struct afs_vnode *dvnode,
1782 enum afs_dir_invalid_trace trace)
1783 {
1784 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1785 trace_afs_dir_invalid(dvnode, trace);
1786 afs_stat_v(dvnode, n_inval);
1787 }
1788 }
1789
1790 /*****************************************************************************/
1791 /*
1792 * debug tracing
1793 */
1794 extern unsigned afs_debug;
1795
1796 #define dbgprintk(FMT,...) \
1797 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1798
1799 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1800 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1801 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1802
1803
1804 #if defined(__KDEBUG)
1805 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1806 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1807 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1808
1809 #elif defined(CONFIG_AFS_DEBUG)
1810 #define AFS_DEBUG_KENTER 0x01
1811 #define AFS_DEBUG_KLEAVE 0x02
1812 #define AFS_DEBUG_KDEBUG 0x04
1813
1814 #define _enter(FMT,...) \
1815 do { \
1816 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1817 kenter(FMT,##__VA_ARGS__); \
1818 } while (0)
1819
1820 #define _leave(FMT,...) \
1821 do { \
1822 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1823 kleave(FMT,##__VA_ARGS__); \
1824 } while (0)
1825
1826 #define _debug(FMT,...) \
1827 do { \
1828 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1829 kdebug(FMT,##__VA_ARGS__); \
1830 } while (0)
1831
1832 #else
1833 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1834 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1835 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1836 #endif
1837
1838 /*
1839 * debug assertion checking
1840 */
1841 #if 1 // defined(__KDEBUGALL)
1842
1843 #define ASSERT(X) \
1844 do { \
1845 if (unlikely(!(X))) { \
1846 printk(KERN_ERR "\n"); \
1847 printk(KERN_ERR "AFS: Assertion failed\n"); \
1848 BUG(); \
1849 } \
1850 } while(0)
1851
1852 #define ASSERTCMP(X, OP, Y) \
1853 do { \
1854 if (unlikely(!((X) OP (Y)))) { \
1855 printk(KERN_ERR "\n"); \
1856 printk(KERN_ERR "AFS: Assertion failed\n"); \
1857 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1858 (unsigned long)(X), (unsigned long)(Y)); \
1859 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1860 (unsigned long)(X), (unsigned long)(Y)); \
1861 BUG(); \
1862 } \
1863 } while(0)
1864
1865 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1866 do { \
1867 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1868 printk(KERN_ERR "\n"); \
1869 printk(KERN_ERR "AFS: Assertion failed\n"); \
1870 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1871 (unsigned long)(L), (unsigned long)(N), \
1872 (unsigned long)(H)); \
1873 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1874 (unsigned long)(L), (unsigned long)(N), \
1875 (unsigned long)(H)); \
1876 BUG(); \
1877 } \
1878 } while(0)
1879
1880 #define ASSERTIF(C, X) \
1881 do { \
1882 if (unlikely((C) && !(X))) { \
1883 printk(KERN_ERR "\n"); \
1884 printk(KERN_ERR "AFS: Assertion failed\n"); \
1885 BUG(); \
1886 } \
1887 } while(0)
1888
1889 #define ASSERTIFCMP(C, X, OP, Y) \
1890 do { \
1891 if (unlikely((C) && !((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 #else
1903
1904 #define ASSERT(X) \
1905 do { \
1906 } while(0)
1907
1908 #define ASSERTCMP(X, OP, Y) \
1909 do { \
1910 } while(0)
1911
1912 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1913 do { \
1914 } while(0)
1915
1916 #define ASSERTIF(C, X) \
1917 do { \
1918 } while(0)
1919
1920 #define ASSERTIFCMP(C, X, OP, Y) \
1921 do { \
1922 } while(0)
1923
1924 #endif /* __KDEBUGALL */
1925