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/pagemap.h>
13 #include <linux/rxrpc.h>
14 #include <linux/key.h>
15 #include <linux/workqueue.h>
16 #include <linux/sched.h>
17 #include <linux/fscache.h>
18 #include <linux/backing-dev.h>
19 #include <linux/uuid.h>
20 #include <linux/mm_types.h>
21 #include <linux/dns_resolver.h>
22 #include <net/net_namespace.h>
23 #include <net/netns/generic.h>
24 #include <net/sock.h>
25 #include <net/af_rxrpc.h>
26
27 #include "afs.h"
28 #include "afs_vl.h"
29
30 #define AFS_CELL_MAX_ADDRS 15
31
32 struct pagevec;
33 struct afs_call;
34
35 /*
36 * Partial file-locking emulation mode. (The problem being that AFS3 only
37 * allows whole-file locks and no upgrading/downgrading).
38 */
39 enum afs_flock_mode {
40 afs_flock_mode_unset,
41 afs_flock_mode_local, /* Local locking only */
42 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
43 afs_flock_mode_strict, /* Always get a server lock for a partial lock */
44 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
45 };
46
47 struct afs_fs_context {
48 bool force; /* T to force cell type */
49 bool autocell; /* T if set auto mount operation */
50 bool dyn_root; /* T if dynamic root */
51 bool no_cell; /* T if the source is "none" (for dynroot) */
52 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
53 afs_voltype_t type; /* type of volume requested */
54 unsigned int volnamesz; /* size of volume name */
55 const char *volname; /* name of volume to mount */
56 struct afs_net *net; /* the AFS net namespace stuff */
57 struct afs_cell *cell; /* cell in which to find volume */
58 struct afs_volume *volume; /* volume record */
59 struct key *key; /* key to use for secure mounting */
60 };
61
62 struct afs_iget_data {
63 struct afs_fid fid;
64 struct afs_volume *volume; /* volume on which resides */
65 unsigned int cb_v_break; /* Pre-fetch volume break count */
66 unsigned int cb_s_break; /* Pre-fetch server break count */
67 };
68
69 enum afs_call_state {
70 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
71 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
72 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
73 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
74 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
75 AFS_CALL_SV_REPLYING, /* Server: Replying */
76 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
77 AFS_CALL_COMPLETE, /* Completed or failed */
78 };
79
80 /*
81 * List of server addresses.
82 */
83 struct afs_addr_list {
84 struct rcu_head rcu; /* Must be first */
85 refcount_t usage;
86 u32 version; /* Version */
87 unsigned char max_addrs;
88 unsigned char nr_addrs;
89 unsigned char preferred; /* Preferred address */
90 unsigned char nr_ipv4; /* Number of IPv4 addresses */
91 enum dns_record_source source:8;
92 enum dns_lookup_status status:8;
93 unsigned long probed; /* Mask of servers that have been probed */
94 unsigned long failed; /* Mask of addrs that failed locally/ICMP */
95 unsigned long responded; /* Mask of addrs that responded */
96 struct sockaddr_rxrpc addrs[];
97 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
98 };
99
100 /*
101 * a record of an in-progress RxRPC call
102 */
103 struct afs_call {
104 const struct afs_call_type *type; /* type of call */
105 struct afs_addr_list *alist; /* Address is alist[addr_ix] */
106 wait_queue_head_t waitq; /* processes awaiting completion */
107 struct work_struct async_work; /* async I/O processor */
108 struct work_struct work; /* actual work processor */
109 struct rxrpc_call *rxcall; /* RxRPC call handle */
110 struct key *key; /* security for this call */
111 struct afs_net *net; /* The network namespace */
112 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
113 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
114 struct afs_cb_interest *cbi; /* Callback interest for server used */
115 struct afs_vnode *lvnode; /* vnode being locked */
116 void *request; /* request data (first part) */
117 struct address_space *mapping; /* Pages being written from */
118 struct iov_iter iter; /* Buffer iterator */
119 struct iov_iter *_iter; /* Iterator currently in use */
120 union { /* Convenience for ->iter */
121 struct kvec kvec[1];
122 struct bio_vec bvec[1];
123 };
124 void *buffer; /* reply receive buffer */
125 union {
126 long ret0; /* Value to reply with instead of 0 */
127 struct afs_addr_list *ret_alist;
128 struct afs_vldb_entry *ret_vldb;
129 struct afs_acl *ret_acl;
130 };
131 struct afs_fid *out_fid;
132 struct afs_status_cb *out_dir_scb;
133 struct afs_status_cb *out_scb;
134 struct yfs_acl *out_yacl;
135 struct afs_volsync *out_volsync;
136 struct afs_volume_status *out_volstatus;
137 struct afs_read *read_request;
138 unsigned int server_index;
139 pgoff_t first; /* first page in mapping to deal with */
140 pgoff_t last; /* last page in mapping to deal with */
141 atomic_t usage;
142 enum afs_call_state state;
143 spinlock_t state_lock;
144 int error; /* error code */
145 u32 abort_code; /* Remote abort ID or 0 */
146 u32 epoch;
147 unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */
148 unsigned request_size; /* size of request data */
149 unsigned reply_max; /* maximum size of reply */
150 unsigned first_offset; /* offset into mapping[first] */
151 union {
152 unsigned last_to; /* amount of mapping[last] */
153 unsigned count2; /* count used in unmarshalling */
154 };
155 unsigned char unmarshall; /* unmarshalling phase */
156 unsigned char addr_ix; /* Address in ->alist */
157 bool incoming; /* T if incoming call */
158 bool send_pages; /* T if data from mapping should be sent */
159 bool need_attention; /* T if RxRPC poked us */
160 bool async; /* T if asynchronous */
161 bool upgrade; /* T to request service upgrade */
162 bool have_reply_time; /* T if have got reply_time */
163 bool intr; /* T if interruptible */
164 u16 service_id; /* Actual service ID (after upgrade) */
165 unsigned int debug_id; /* Trace ID */
166 u32 operation_ID; /* operation ID for an incoming call */
167 u32 count; /* count for use in unmarshalling */
168 union { /* place to extract temporary data */
169 struct {
170 __be32 tmp_u;
171 __be32 tmp;
172 } __attribute__((packed));
173 __be64 tmp64;
174 };
175 ktime_t reply_time; /* Time of first reply packet */
176 };
177
178 struct afs_call_type {
179 const char *name;
180 unsigned int op; /* Really enum afs_fs_operation */
181
182 /* deliver request or reply data to an call
183 * - returning an error will cause the call to be aborted
184 */
185 int (*deliver)(struct afs_call *call);
186
187 /* clean up a call */
188 void (*destructor)(struct afs_call *call);
189
190 /* Work function */
191 void (*work)(struct work_struct *work);
192
193 /* Call done function (gets called immediately on success or failure) */
194 void (*done)(struct afs_call *call);
195 };
196
197 /*
198 * Key available for writeback on a file.
199 */
200 struct afs_wb_key {
201 refcount_t usage;
202 struct key *key;
203 struct list_head vnode_link; /* Link in vnode->wb_keys */
204 };
205
206 /*
207 * AFS open file information record. Pointed to by file->private_data.
208 */
209 struct afs_file {
210 struct key *key; /* The key this file was opened with */
211 struct afs_wb_key *wb; /* Writeback key record for this file */
212 };
213
afs_file_key(struct file * file)214 static inline struct key *afs_file_key(struct file *file)
215 {
216 struct afs_file *af = file->private_data;
217
218 return af->key;
219 }
220
221 /*
222 * Record of an outstanding read operation on a vnode.
223 */
224 struct afs_read {
225 loff_t pos; /* Where to start reading */
226 loff_t len; /* How much we're asking for */
227 loff_t actual_len; /* How much we're actually getting */
228 loff_t remain; /* Amount remaining */
229 loff_t file_size; /* File size returned by server */
230 afs_dataversion_t data_version; /* Version number returned by server */
231 refcount_t usage;
232 unsigned int index; /* Which page we're reading into */
233 unsigned int nr_pages;
234 unsigned int offset; /* offset into current page */
235 struct afs_vnode *vnode;
236 void (*page_done)(struct afs_read *);
237 struct page **pages;
238 struct page *array[];
239 };
240
241 /*
242 * AFS superblock private data
243 * - there's one superblock per volume
244 */
245 struct afs_super_info {
246 struct net *net_ns; /* Network namespace */
247 struct afs_cell *cell; /* The cell in which the volume resides */
248 struct afs_volume *volume; /* volume record */
249 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
250 bool dyn_root; /* True if dynamic root */
251 };
252
AFS_FS_S(struct super_block * sb)253 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
254 {
255 return sb->s_fs_info;
256 }
257
258 extern struct file_system_type afs_fs_type;
259
260 /*
261 * Set of substitutes for @sys.
262 */
263 struct afs_sysnames {
264 #define AFS_NR_SYSNAME 16
265 char *subs[AFS_NR_SYSNAME];
266 refcount_t usage;
267 unsigned short nr;
268 char blank[1];
269 };
270
271 /*
272 * AFS network namespace record.
273 */
274 struct afs_net {
275 struct net *net; /* Backpointer to the owning net namespace */
276 struct afs_uuid uuid;
277 bool live; /* F if this namespace is being removed */
278
279 /* AF_RXRPC I/O stuff */
280 struct socket *socket;
281 struct afs_call *spare_incoming_call;
282 struct work_struct charge_preallocation_work;
283 struct mutex socket_mutex;
284 atomic_t nr_outstanding_calls;
285 atomic_t nr_superblocks;
286
287 /* Cell database */
288 struct rb_root cells;
289 struct afs_cell __rcu *ws_cell;
290 struct work_struct cells_manager;
291 struct timer_list cells_timer;
292 atomic_t cells_outstanding;
293 seqlock_t cells_lock;
294
295 struct mutex proc_cells_lock;
296 struct hlist_head proc_cells;
297
298 /* Known servers. Theoretically each fileserver can only be in one
299 * cell, but in practice, people create aliases and subsets and there's
300 * no easy way to distinguish them.
301 */
302 seqlock_t fs_lock; /* For fs_servers */
303 struct rb_root fs_servers; /* afs_server (by server UUID or address) */
304 struct list_head fs_updates; /* afs_server (by update_at) */
305 struct hlist_head fs_proc; /* procfs servers list */
306
307 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */
308 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */
309 seqlock_t fs_addr_lock; /* For fs_addresses[46] */
310
311 struct work_struct fs_manager;
312 struct timer_list fs_timer;
313 atomic_t servers_outstanding;
314
315 /* File locking renewal management */
316 struct mutex lock_manager_mutex;
317
318 /* Misc */
319 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
320 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
321 struct afs_sysnames *sysnames;
322 rwlock_t sysnames_lock;
323
324 /* Statistics counters */
325 atomic_t n_lookup; /* Number of lookups done */
326 atomic_t n_reval; /* Number of dentries needing revalidation */
327 atomic_t n_inval; /* Number of invalidations by the server */
328 atomic_t n_relpg; /* Number of invalidations by releasepage */
329 atomic_t n_read_dir; /* Number of directory pages read */
330 atomic_t n_dir_cr; /* Number of directory entry creation edits */
331 atomic_t n_dir_rm; /* Number of directory entry removal edits */
332 atomic_t n_stores; /* Number of store ops */
333 atomic_long_t n_store_bytes; /* Number of bytes stored */
334 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
335 atomic_t n_fetches; /* Number of data fetch ops */
336 };
337
338 extern const char afs_init_sysname[];
339
340 enum afs_cell_state {
341 AFS_CELL_UNSET,
342 AFS_CELL_ACTIVATING,
343 AFS_CELL_ACTIVE,
344 AFS_CELL_DEACTIVATING,
345 AFS_CELL_INACTIVE,
346 AFS_CELL_FAILED,
347 };
348
349 /*
350 * AFS cell record.
351 *
352 * This is a tricky concept to get right as it is possible to create aliases
353 * simply by pointing AFSDB/SRV records for two names at the same set of VL
354 * servers; it is also possible to do things like setting up two sets of VL
355 * servers, one of which provides a superset of the volumes provided by the
356 * other (for internal/external division, for example).
357 *
358 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
359 * servers and (b) a cell's name is used by the client to select the key to use
360 * for authentication and encryption. The cell name is not typically used in
361 * the protocol.
362 *
363 * There is no easy way to determine if two cells are aliases or one is a
364 * subset of another.
365 */
366 struct afs_cell {
367 union {
368 struct rcu_head rcu;
369 struct rb_node net_node; /* Node in net->cells */
370 };
371 struct afs_net *net;
372 struct key *anonymous_key; /* anonymous user key for this cell */
373 struct work_struct manager; /* Manager for init/deinit/dns */
374 struct hlist_node proc_link; /* /proc cell list link */
375 #ifdef CONFIG_AFS_FSCACHE
376 struct fscache_cookie *cache; /* caching cookie */
377 #endif
378 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
379 time64_t last_inactive; /* Time of last drop of usage count */
380 atomic_t usage;
381 unsigned long flags;
382 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
383 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
384 enum afs_cell_state state;
385 short error;
386 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
387 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
388 unsigned int dns_lookup_count; /* Counter of DNS lookups */
389
390 /* Active fileserver interaction state. */
391 struct list_head proc_volumes; /* procfs volume list */
392 rwlock_t proc_lock;
393
394 /* VL server list. */
395 rwlock_t vl_servers_lock; /* Lock on vl_servers */
396 struct afs_vlserver_list __rcu *vl_servers;
397
398 u8 name_len; /* Length of name */
399 char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */
400 };
401
402 /*
403 * Volume Location server record.
404 */
405 struct afs_vlserver {
406 struct rcu_head rcu;
407 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
408 unsigned long flags;
409 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
410 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
411 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
412 rwlock_t lock; /* Lock on addresses */
413 atomic_t usage;
414
415 /* Probe state */
416 wait_queue_head_t probe_wq;
417 atomic_t probe_outstanding;
418 spinlock_t probe_lock;
419 struct {
420 unsigned int rtt; /* RTT as ktime/64 */
421 u32 abort_code;
422 short error;
423 bool have_result;
424 bool responded:1;
425 bool is_yfs:1;
426 bool not_yfs:1;
427 bool local_failure:1;
428 } probe;
429
430 u16 port;
431 u16 name_len; /* Length of name */
432 char name[]; /* Server name, case-flattened */
433 };
434
435 /*
436 * Weighted list of Volume Location servers.
437 */
438 struct afs_vlserver_entry {
439 u16 priority; /* Preference (as SRV) */
440 u16 weight; /* Weight (as SRV) */
441 enum dns_record_source source:8;
442 enum dns_lookup_status status:8;
443 struct afs_vlserver *server;
444 };
445
446 struct afs_vlserver_list {
447 struct rcu_head rcu;
448 atomic_t usage;
449 u8 nr_servers;
450 u8 index; /* Server currently in use */
451 u8 preferred; /* Preferred server */
452 enum dns_record_source source:8;
453 enum dns_lookup_status status:8;
454 rwlock_t lock;
455 struct afs_vlserver_entry servers[];
456 };
457
458 /*
459 * Cached VLDB entry.
460 *
461 * This is pointed to by cell->vldb_entries, indexed by name.
462 */
463 struct afs_vldb_entry {
464 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
465
466 unsigned long flags;
467 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
468 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
469 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
470 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
471 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
472
473 uuid_t fs_server[AFS_NMAXNSERVERS];
474 u8 fs_mask[AFS_NMAXNSERVERS];
475 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
476 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
477 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
478 short error;
479 u8 nr_servers; /* Number of server records */
480 u8 name_len;
481 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
482 };
483
484 /*
485 * Record of fileserver with which we're actively communicating.
486 */
487 struct afs_server {
488 struct rcu_head rcu;
489 union {
490 uuid_t uuid; /* Server ID */
491 struct afs_uuid _uuid;
492 };
493
494 struct afs_addr_list __rcu *addresses;
495 struct rb_node uuid_rb; /* Link in net->servers */
496 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */
497 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */
498 struct hlist_node proc_link; /* Link in net->fs_proc */
499 struct afs_server *gc_next; /* Next server in manager's list */
500 time64_t put_time; /* Time at which last put */
501 time64_t update_at; /* Time at which to next update the record */
502 unsigned long flags;
503 #define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */
504 #define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */
505 #define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */
506 #define AFS_SERVER_FL_UPDATING 4
507 #define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */
508 #define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */
509 #define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */
510 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
511 #define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */
512 #define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */
513 #define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */
514 atomic_t usage;
515 u32 addr_version; /* Address list version */
516 u32 cm_epoch; /* Server RxRPC epoch */
517 unsigned int debug_id; /* Debugging ID for traces */
518
519 /* file service access */
520 rwlock_t fs_lock; /* access lock */
521
522 /* callback promise management */
523 struct hlist_head cb_volumes; /* List of volume interests on this server */
524 unsigned cb_s_break; /* Break-everything counter. */
525 rwlock_t cb_break_lock; /* Volume finding lock */
526
527 /* Probe state */
528 wait_queue_head_t probe_wq;
529 atomic_t probe_outstanding;
530 spinlock_t probe_lock;
531 struct {
532 unsigned int rtt; /* RTT as ktime/64 */
533 u32 abort_code;
534 u32 cm_epoch;
535 short error;
536 bool have_result;
537 bool responded:1;
538 bool is_yfs:1;
539 bool not_yfs:1;
540 bool local_failure:1;
541 bool no_epoch:1;
542 bool cm_probed:1;
543 bool said_rebooted:1;
544 bool said_inconsistent:1;
545 } probe;
546 };
547
548 /*
549 * Volume collation in the server's callback interest list.
550 */
551 struct afs_vol_interest {
552 struct hlist_node srv_link; /* Link in server->cb_volumes */
553 struct hlist_head cb_interests; /* List of callback interests on the server */
554 union {
555 struct rcu_head rcu;
556 afs_volid_t vid; /* Volume ID to match */
557 };
558 unsigned int usage;
559 };
560
561 /*
562 * Interest by a superblock on a server.
563 */
564 struct afs_cb_interest {
565 struct hlist_node cb_vlink; /* Link in vol_interest->cb_interests */
566 struct afs_vol_interest *vol_interest;
567 struct afs_server *server; /* Server on which this interest resides */
568 struct super_block *sb; /* Superblock on which inodes reside */
569 union {
570 struct rcu_head rcu;
571 afs_volid_t vid; /* Volume ID to match */
572 };
573 refcount_t usage;
574 };
575
576 /*
577 * Replaceable server list.
578 */
579 struct afs_server_entry {
580 struct afs_server *server;
581 struct afs_cb_interest *cb_interest;
582 };
583
584 struct afs_server_list {
585 refcount_t usage;
586 unsigned char nr_servers;
587 unsigned char preferred; /* Preferred server */
588 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
589 unsigned int seq; /* Set to ->servers_seq when installed */
590 rwlock_t lock;
591 struct afs_server_entry servers[];
592 };
593
594 /*
595 * Live AFS volume management.
596 */
597 struct afs_volume {
598 afs_volid_t vid; /* volume ID */
599 atomic_t usage;
600 time64_t update_at; /* Time at which to next update */
601 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
602 struct list_head proc_link; /* Link in cell->vl_proc */
603 unsigned long flags;
604 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
605 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
606 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
607 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
608 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */
609 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */
610 #ifdef CONFIG_AFS_FSCACHE
611 struct fscache_cookie *cache; /* caching cookie */
612 #endif
613 struct afs_server_list *servers; /* List of servers on which volume resides */
614 rwlock_t servers_lock; /* Lock for ->servers */
615 unsigned int servers_seq; /* Incremented each time ->servers changes */
616
617 unsigned cb_v_break; /* Break-everything counter. */
618 rwlock_t cb_v_break_lock;
619
620 afs_voltype_t type; /* type of volume */
621 short error;
622 char type_force; /* force volume type (suppress R/O -> R/W) */
623 u8 name_len;
624 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
625 };
626
627 enum afs_lock_state {
628 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
629 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
630 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
631 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
632 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
633 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
634 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
635 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
636 };
637
638 /*
639 * AFS inode private data.
640 *
641 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
642 * leak from one inode to another.
643 */
644 struct afs_vnode {
645 struct inode vfs_inode; /* the VFS's inode record */
646
647 struct afs_volume *volume; /* volume on which vnode resides */
648 struct afs_fid fid; /* the file identifier for this inode */
649 struct afs_file_status status; /* AFS status info for this file */
650 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
651 #ifdef CONFIG_AFS_FSCACHE
652 struct fscache_cookie *cache; /* caching cookie */
653 #endif
654 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
655 struct mutex io_lock; /* Lock for serialising I/O on this mutex */
656 struct rw_semaphore validate_lock; /* lock for validating this vnode */
657 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
658 struct key *silly_key; /* Silly rename key */
659 spinlock_t wb_lock; /* lock for wb_keys */
660 spinlock_t lock; /* waitqueue/flags lock */
661 unsigned long flags;
662 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */
663 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
664 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
665 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
666 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
667 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
668 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
669 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
670 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
671
672 struct list_head wb_keys; /* List of keys available for writeback */
673 struct list_head pending_locks; /* locks waiting to be granted */
674 struct list_head granted_locks; /* locks granted on this file */
675 struct delayed_work lock_work; /* work to be done in locking */
676 struct key *lock_key; /* Key to be used in lock ops */
677 ktime_t locked_at; /* Time at which lock obtained */
678 enum afs_lock_state lock_state : 8;
679 afs_lock_type_t lock_type : 8;
680
681 /* outstanding callback notification on this file */
682 struct afs_cb_interest __rcu *cb_interest; /* Server on which this resides */
683 unsigned int cb_s_break; /* Mass break counter on ->server */
684 unsigned int cb_v_break; /* Mass break counter on ->volume */
685 unsigned int cb_break; /* Break counter on vnode */
686 seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */
687
688 time64_t cb_expires_at; /* time at which callback expires */
689 };
690
afs_vnode_cache(struct afs_vnode * vnode)691 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
692 {
693 #ifdef CONFIG_AFS_FSCACHE
694 return vnode->cache;
695 #else
696 return NULL;
697 #endif
698 }
699
700 /*
701 * cached security record for one user's attempt to access a vnode
702 */
703 struct afs_permit {
704 struct key *key; /* RxRPC ticket holding a security context */
705 afs_access_t access; /* CallerAccess value for this key */
706 };
707
708 /*
709 * Immutable cache of CallerAccess records from attempts to access vnodes.
710 * These may be shared between multiple vnodes.
711 */
712 struct afs_permits {
713 struct rcu_head rcu;
714 struct hlist_node hash_node; /* Link in hash */
715 unsigned long h; /* Hash value for this permit list */
716 refcount_t usage;
717 unsigned short nr_permits; /* Number of records */
718 bool invalidated; /* Invalidated due to key change */
719 struct afs_permit permits[]; /* List of permits sorted by key pointer */
720 };
721
722 /*
723 * Error prioritisation and accumulation.
724 */
725 struct afs_error {
726 short error; /* Accumulated error */
727 bool responded; /* T if server responded */
728 };
729
730 /*
731 * Cursor for iterating over a server's address list.
732 */
733 struct afs_addr_cursor {
734 struct afs_addr_list *alist; /* Current address list (pins ref) */
735 unsigned long tried; /* Tried addresses */
736 signed char index; /* Current address */
737 bool responded; /* T if the current address responded */
738 unsigned short nr_iterations; /* Number of address iterations */
739 short error;
740 u32 abort_code;
741 };
742
743 /*
744 * Cursor for iterating over a set of volume location servers.
745 */
746 struct afs_vl_cursor {
747 struct afs_addr_cursor ac;
748 struct afs_cell *cell; /* The cell we're querying */
749 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
750 struct afs_vlserver *server; /* Server on which this resides */
751 struct key *key; /* Key for the server */
752 unsigned long untried; /* Bitmask of untried servers */
753 short index; /* Current server */
754 short error;
755 unsigned short flags;
756 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
757 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
758 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
759 unsigned short nr_iterations; /* Number of server iterations */
760 };
761
762 /*
763 * Cursor for iterating over a set of fileservers.
764 */
765 struct afs_fs_cursor {
766 const struct afs_call_type *type; /* Type of call done */
767 struct afs_addr_cursor ac;
768 struct afs_vnode *vnode;
769 struct afs_server_list *server_list; /* Current server list (pins ref) */
770 struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */
771 struct key *key; /* Key for the server */
772 unsigned long untried; /* Bitmask of untried servers */
773 unsigned int cb_break; /* cb_break + cb_s_break before the call */
774 unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */
775 short index; /* Current server */
776 short error;
777 unsigned short flags;
778 #define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */
779 #define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */
780 #define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */
781 #define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */
782 #define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
783 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
784 #define AFS_FS_CURSOR_INTR 0x0040 /* Set if op is interruptible */
785 unsigned short nr_iterations; /* Number of server iterations */
786 };
787
788 /*
789 * Cache auxiliary data.
790 */
791 struct afs_vnode_cache_aux {
792 u64 data_version;
793 } __packed;
794
795 #include <trace/events/afs.h>
796
797 /*****************************************************************************/
798 /*
799 * addr_list.c
800 */
afs_get_addrlist(struct afs_addr_list * alist)801 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
802 {
803 if (alist)
804 refcount_inc(&alist->usage);
805 return alist;
806 }
807 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
808 unsigned short,
809 unsigned short);
810 extern void afs_put_addrlist(struct afs_addr_list *);
811 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
812 const char *, size_t, char,
813 unsigned short, unsigned short);
814 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
815 extern bool afs_iterate_addresses(struct afs_addr_cursor *);
816 extern int afs_end_cursor(struct afs_addr_cursor *);
817
818 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
819 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
820
821 /*
822 * cache.c
823 */
824 #ifdef CONFIG_AFS_FSCACHE
825 extern struct fscache_netfs afs_cache_netfs;
826 extern struct fscache_cookie_def afs_cell_cache_index_def;
827 extern struct fscache_cookie_def afs_volume_cache_index_def;
828 extern struct fscache_cookie_def afs_vnode_cache_index_def;
829 #else
830 #define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL)
831 #define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL)
832 #define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL)
833 #endif
834
835 /*
836 * callback.c
837 */
838 extern void afs_init_callback_state(struct afs_server *);
839 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
840 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
841 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
842
843 extern int afs_register_server_cb_interest(struct afs_vnode *,
844 struct afs_server_list *, unsigned int);
845 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *);
846 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *);
847
afs_get_cb_interest(struct afs_cb_interest * cbi)848 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi)
849 {
850 if (cbi)
851 refcount_inc(&cbi->usage);
852 return cbi;
853 }
854
afs_calc_vnode_cb_break(struct afs_vnode * vnode)855 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
856 {
857 return vnode->cb_break + vnode->cb_v_break;
858 }
859
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode,const struct afs_cb_interest * cbi)860 static inline bool afs_cb_is_broken(unsigned int cb_break,
861 const struct afs_vnode *vnode,
862 const struct afs_cb_interest *cbi)
863 {
864 return !cbi || cb_break != (vnode->cb_break +
865 vnode->volume->cb_v_break);
866 }
867
868 /*
869 * cell.c
870 */
871 extern int afs_cell_init(struct afs_net *, const char *);
872 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned);
873 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
874 const char *, bool);
875 extern struct afs_cell *afs_get_cell(struct afs_cell *);
876 extern void afs_put_cell(struct afs_net *, struct afs_cell *);
877 extern void afs_manage_cells(struct work_struct *);
878 extern void afs_cells_timer(struct timer_list *);
879 extern void __net_exit afs_cell_purge(struct afs_net *);
880
881 /*
882 * cmservice.c
883 */
884 extern bool afs_cm_incoming_call(struct afs_call *);
885
886 /*
887 * dir.c
888 */
889 extern const struct file_operations afs_dir_file_operations;
890 extern const struct inode_operations afs_dir_inode_operations;
891 extern const struct address_space_operations afs_dir_aops;
892 extern const struct dentry_operations afs_fs_dentry_operations;
893
894 extern void afs_d_release(struct dentry *);
895
896 /*
897 * dir_edit.c
898 */
899 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
900 enum afs_edit_dir_reason);
901 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
902
903 /*
904 * dir_silly.c
905 */
906 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
907 struct dentry *, struct key *);
908 extern int afs_silly_iput(struct dentry *, struct inode *);
909
910 /*
911 * dynroot.c
912 */
913 extern const struct inode_operations afs_dynroot_inode_operations;
914 extern const struct dentry_operations afs_dynroot_dentry_operations;
915
916 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
917 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
918 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
919 extern int afs_dynroot_populate(struct super_block *);
920 extern void afs_dynroot_depopulate(struct super_block *);
921
922 /*
923 * file.c
924 */
925 extern const struct address_space_operations afs_fs_aops;
926 extern const struct inode_operations afs_file_inode_operations;
927 extern const struct file_operations afs_file_operations;
928
929 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
930 extern void afs_put_wb_key(struct afs_wb_key *);
931 extern int afs_open(struct inode *, struct file *);
932 extern int afs_release(struct inode *, struct file *);
933 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *);
934 extern int afs_page_filler(void *, struct page *);
935 extern void afs_put_read(struct afs_read *);
936
937 /*
938 * flock.c
939 */
940 extern struct workqueue_struct *afs_lock_manager;
941
942 extern void afs_lock_op_done(struct afs_call *);
943 extern void afs_lock_work(struct work_struct *);
944 extern void afs_lock_may_be_available(struct afs_vnode *);
945 extern int afs_lock(struct file *, int, struct file_lock *);
946 extern int afs_flock(struct file *, int, struct file_lock *);
947
948 /*
949 * fsclient.c
950 */
951 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *,
952 struct afs_volsync *);
953 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *);
954 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *);
955 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t,
956 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *);
957 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool,
958 struct afs_status_cb *);
959 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *,
960 struct afs_status_cb *, struct afs_status_cb *);
961 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *,
962 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *);
963 extern int afs_fs_rename(struct afs_fs_cursor *, const char *,
964 struct afs_vnode *, const char *,
965 struct afs_status_cb *, struct afs_status_cb *);
966 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *,
967 pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *);
968 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *);
969 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *);
970 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *);
971 extern int afs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *);
972 extern int afs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *);
973 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
974 struct afs_addr_cursor *, struct key *);
975 extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
976 struct afs_addr_cursor *, struct key *,
977 unsigned int);
978 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
979 struct afs_fid *, struct afs_status_cb *,
980 unsigned int, struct afs_volsync *);
981 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *,
982 struct afs_fid *, struct afs_status_cb *,
983 struct afs_volsync *);
984
985 struct afs_acl {
986 u32 size;
987 u8 data[];
988 };
989
990 extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *, struct afs_status_cb *);
991 extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *,
992 struct afs_status_cb *);
993
994 /*
995 * fs_probe.c
996 */
997 extern void afs_fileserver_probe_result(struct afs_call *);
998 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *);
999 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
1000
1001 /*
1002 * inode.c
1003 */
1004 extern void afs_vnode_commit_status(struct afs_fs_cursor *,
1005 struct afs_vnode *,
1006 unsigned int,
1007 const afs_dataversion_t *,
1008 struct afs_status_cb *);
1009 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1010 extern int afs_iget5_test(struct inode *, void *);
1011 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1012 extern struct inode *afs_iget(struct super_block *, struct key *,
1013 struct afs_iget_data *, struct afs_status_cb *,
1014 struct afs_cb_interest *,
1015 struct afs_vnode *);
1016 extern void afs_zap_data(struct afs_vnode *);
1017 extern bool afs_check_validity(struct afs_vnode *);
1018 extern int afs_validate(struct afs_vnode *, struct key *);
1019 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
1020 extern int afs_setattr(struct dentry *, struct iattr *);
1021 extern void afs_evict_inode(struct inode *);
1022 extern int afs_drop_inode(struct inode *);
1023
1024 /*
1025 * main.c
1026 */
1027 extern struct workqueue_struct *afs_wq;
1028 extern int afs_net_id;
1029
afs_net(struct net * net)1030 static inline struct afs_net *afs_net(struct net *net)
1031 {
1032 return net_generic(net, afs_net_id);
1033 }
1034
afs_sb2net(struct super_block * sb)1035 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1036 {
1037 return afs_net(AFS_FS_S(sb)->net_ns);
1038 }
1039
afs_d2net(struct dentry * dentry)1040 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1041 {
1042 return afs_sb2net(dentry->d_sb);
1043 }
1044
afs_i2net(struct inode * inode)1045 static inline struct afs_net *afs_i2net(struct inode *inode)
1046 {
1047 return afs_sb2net(inode->i_sb);
1048 }
1049
afs_v2net(struct afs_vnode * vnode)1050 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1051 {
1052 return afs_i2net(&vnode->vfs_inode);
1053 }
1054
afs_sock2net(struct sock * sk)1055 static inline struct afs_net *afs_sock2net(struct sock *sk)
1056 {
1057 return net_generic(sock_net(sk), afs_net_id);
1058 }
1059
__afs_stat(atomic_t * s)1060 static inline void __afs_stat(atomic_t *s)
1061 {
1062 atomic_inc(s);
1063 }
1064
1065 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1066
1067 /*
1068 * misc.c
1069 */
1070 extern int afs_abort_to_error(u32);
1071 extern void afs_prioritise_error(struct afs_error *, int, u32);
1072
1073 /*
1074 * mntpt.c
1075 */
1076 extern const struct inode_operations afs_mntpt_inode_operations;
1077 extern const struct inode_operations afs_autocell_inode_operations;
1078 extern const struct file_operations afs_mntpt_file_operations;
1079
1080 extern struct vfsmount *afs_d_automount(struct path *);
1081 extern void afs_mntpt_kill_timer(void);
1082
1083 /*
1084 * proc.c
1085 */
1086 #ifdef CONFIG_PROC_FS
1087 extern int __net_init afs_proc_init(struct afs_net *);
1088 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1089 extern int afs_proc_cell_setup(struct afs_cell *);
1090 extern void afs_proc_cell_remove(struct afs_cell *);
1091 extern void afs_put_sysnames(struct afs_sysnames *);
1092 #else
afs_proc_init(struct afs_net * net)1093 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1094 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1095 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1096 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1097 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1098 #endif
1099
1100 /*
1101 * rotate.c
1102 */
1103 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *,
1104 struct key *, bool);
1105 extern bool afs_select_fileserver(struct afs_fs_cursor *);
1106 extern bool afs_select_current_fileserver(struct afs_fs_cursor *);
1107 extern int afs_end_vnode_operation(struct afs_fs_cursor *);
1108
1109 /*
1110 * rxrpc.c
1111 */
1112 extern struct workqueue_struct *afs_async_calls;
1113
1114 extern int __net_init afs_open_socket(struct afs_net *);
1115 extern void __net_exit afs_close_socket(struct afs_net *);
1116 extern void afs_charge_preallocation(struct work_struct *);
1117 extern void afs_put_call(struct afs_call *);
1118 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
1119 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
1120 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1121 const struct afs_call_type *,
1122 size_t, size_t);
1123 extern void afs_flat_call_destructor(struct afs_call *);
1124 extern void afs_send_empty_reply(struct afs_call *);
1125 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1126 extern int afs_extract_data(struct afs_call *, bool);
1127 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause);
1128
afs_set_fc_call(struct afs_call * call,struct afs_fs_cursor * fc)1129 static inline void afs_set_fc_call(struct afs_call *call, struct afs_fs_cursor *fc)
1130 {
1131 call->intr = fc->flags & AFS_FS_CURSOR_INTR;
1132 fc->type = call->type;
1133 }
1134
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1135 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1136 {
1137 call->kvec[0].iov_base = buf;
1138 call->kvec[0].iov_len = size;
1139 iov_iter_kvec(&call->iter, READ, call->kvec, 1, size);
1140 }
1141
afs_extract_to_tmp(struct afs_call * call)1142 static inline void afs_extract_to_tmp(struct afs_call *call)
1143 {
1144 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1145 }
1146
afs_extract_to_tmp64(struct afs_call * call)1147 static inline void afs_extract_to_tmp64(struct afs_call *call)
1148 {
1149 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1150 }
1151
afs_extract_discard(struct afs_call * call,size_t size)1152 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1153 {
1154 iov_iter_discard(&call->iter, READ, size);
1155 }
1156
afs_extract_to_buf(struct afs_call * call,size_t size)1157 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1158 {
1159 afs_extract_begin(call, call->buffer, size);
1160 }
1161
afs_transfer_reply(struct afs_call * call)1162 static inline int afs_transfer_reply(struct afs_call *call)
1163 {
1164 return afs_extract_data(call, false);
1165 }
1166
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1167 static inline bool afs_check_call_state(struct afs_call *call,
1168 enum afs_call_state state)
1169 {
1170 return READ_ONCE(call->state) == state;
1171 }
1172
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1173 static inline bool afs_set_call_state(struct afs_call *call,
1174 enum afs_call_state from,
1175 enum afs_call_state to)
1176 {
1177 bool ok = false;
1178
1179 spin_lock_bh(&call->state_lock);
1180 if (call->state == from) {
1181 call->state = to;
1182 trace_afs_call_state(call, from, to, 0, 0);
1183 ok = true;
1184 }
1185 spin_unlock_bh(&call->state_lock);
1186 return ok;
1187 }
1188
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1189 static inline void afs_set_call_complete(struct afs_call *call,
1190 int error, u32 remote_abort)
1191 {
1192 enum afs_call_state state;
1193 bool ok = false;
1194
1195 spin_lock_bh(&call->state_lock);
1196 state = call->state;
1197 if (state != AFS_CALL_COMPLETE) {
1198 call->abort_code = remote_abort;
1199 call->error = error;
1200 call->state = AFS_CALL_COMPLETE;
1201 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1202 error, remote_abort);
1203 ok = true;
1204 }
1205 spin_unlock_bh(&call->state_lock);
1206 if (ok)
1207 trace_afs_call_done(call);
1208 }
1209
1210 /*
1211 * security.c
1212 */
1213 extern void afs_put_permits(struct afs_permits *);
1214 extern void afs_clear_permits(struct afs_vnode *);
1215 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1216 struct afs_status_cb *);
1217 extern void afs_zap_permits(struct rcu_head *);
1218 extern struct key *afs_request_key(struct afs_cell *);
1219 extern struct key *afs_request_key_rcu(struct afs_cell *);
1220 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1221 extern int afs_permission(struct inode *, int);
1222 extern void __exit afs_clean_up_permit_cache(void);
1223
1224 /*
1225 * server.c
1226 */
1227 extern spinlock_t afs_server_peer_lock;
1228
1229 extern struct afs_server *afs_find_server(struct afs_net *,
1230 const struct sockaddr_rxrpc *);
1231 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1232 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *);
1233 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1234 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1235 extern void afs_manage_servers(struct work_struct *);
1236 extern void afs_servers_timer(struct timer_list *);
1237 extern void __net_exit afs_purge_servers(struct afs_net *);
1238 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *);
1239
1240 /*
1241 * server_list.c
1242 */
afs_get_serverlist(struct afs_server_list * slist)1243 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1244 {
1245 refcount_inc(&slist->usage);
1246 return slist;
1247 }
1248
1249 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1250 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
1251 struct afs_vldb_entry *,
1252 u8);
1253 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1254
1255 /*
1256 * super.c
1257 */
1258 extern int __init afs_fs_init(void);
1259 extern void afs_fs_exit(void);
1260
1261 /*
1262 * vlclient.c
1263 */
1264 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1265 const char *, int);
1266 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1267 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
1268 struct key *, struct afs_vlserver *, unsigned int);
1269 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1270
1271 /*
1272 * vl_probe.c
1273 */
1274 extern void afs_vlserver_probe_result(struct afs_call *);
1275 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1276 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1277
1278 /*
1279 * vl_rotate.c
1280 */
1281 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1282 struct afs_cell *, struct key *);
1283 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1284 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1285 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1286
1287 /*
1288 * vlserver_list.c
1289 */
afs_get_vlserver(struct afs_vlserver * vlserver)1290 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1291 {
1292 atomic_inc(&vlserver->usage);
1293 return vlserver;
1294 }
1295
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1296 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1297 {
1298 if (vllist)
1299 atomic_inc(&vllist->usage);
1300 return vllist;
1301 }
1302
1303 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1304 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1305 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1306 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1307 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1308 const void *, size_t);
1309
1310 /*
1311 * volume.c
1312 */
__afs_get_volume(struct afs_volume * volume)1313 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume)
1314 {
1315 if (volume)
1316 atomic_inc(&volume->usage);
1317 return volume;
1318 }
1319
1320 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1321 extern void afs_activate_volume(struct afs_volume *);
1322 extern void afs_deactivate_volume(struct afs_volume *);
1323 extern void afs_put_volume(struct afs_cell *, struct afs_volume *);
1324 extern int afs_check_volume_status(struct afs_volume *, struct key *);
1325
1326 /*
1327 * write.c
1328 */
1329 extern int afs_set_page_dirty(struct page *);
1330 extern int afs_write_begin(struct file *file, struct address_space *mapping,
1331 loff_t pos, unsigned len, unsigned flags,
1332 struct page **pagep, void **fsdata);
1333 extern int afs_write_end(struct file *file, struct address_space *mapping,
1334 loff_t pos, unsigned len, unsigned copied,
1335 struct page *page, void *fsdata);
1336 extern int afs_writepage(struct page *, struct writeback_control *);
1337 extern int afs_writepages(struct address_space *, struct writeback_control *);
1338 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
1339 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1340 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1341 extern void afs_prune_wb_keys(struct afs_vnode *);
1342 extern int afs_launder_page(struct page *);
1343
1344 /*
1345 * xattr.c
1346 */
1347 extern const struct xattr_handler *afs_xattr_handlers[];
1348 extern ssize_t afs_listxattr(struct dentry *, char *, size_t);
1349
1350 /*
1351 * yfsclient.c
1352 */
1353 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *,
1354 struct afs_volsync *);
1355 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *);
1356 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *,
1357 struct afs_fid *, struct afs_status_cb *);
1358 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *,
1359 struct afs_fid *, struct afs_status_cb *);
1360 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *,
1361 struct afs_status_cb *, struct afs_status_cb *);
1362 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool,
1363 struct afs_status_cb *);
1364 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *,
1365 struct afs_status_cb *, struct afs_status_cb *);
1366 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *,
1367 struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *);
1368 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, struct afs_vnode *, const char *,
1369 struct afs_status_cb *, struct afs_status_cb *);
1370 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *,
1371 pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *);
1372 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *);
1373 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *);
1374 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *);
1375 extern int yfs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *);
1376 extern int yfs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *);
1377 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *,
1378 struct afs_fid *, struct afs_status_cb *,
1379 struct afs_volsync *);
1380 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
1381 struct afs_fid *, struct afs_status_cb *,
1382 unsigned int, struct afs_volsync *);
1383
1384 struct yfs_acl {
1385 struct afs_acl *acl; /* Dir/file/symlink ACL */
1386 struct afs_acl *vol_acl; /* Whole volume ACL */
1387 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1388 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1389 unsigned int flags;
1390 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1391 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1392 };
1393
1394 extern void yfs_free_opaque_acl(struct yfs_acl *);
1395 extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, struct yfs_acl *,
1396 struct afs_status_cb *);
1397 extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *,
1398 struct afs_status_cb *);
1399
1400 /*
1401 * Miscellaneous inline functions.
1402 */
AFS_FS_I(struct inode * inode)1403 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1404 {
1405 return container_of(inode, struct afs_vnode, vfs_inode);
1406 }
1407
AFS_VNODE_TO_I(struct afs_vnode * vnode)1408 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1409 {
1410 return &vnode->vfs_inode;
1411 }
1412
afs_check_for_remote_deletion(struct afs_fs_cursor * fc,struct afs_vnode * vnode)1413 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc,
1414 struct afs_vnode *vnode)
1415 {
1416 if (fc->ac.error == -ENOENT) {
1417 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1418 afs_break_callback(vnode, afs_cb_break_for_deleted);
1419 }
1420 }
1421
afs_io_error(struct afs_call * call,enum afs_io_error where)1422 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1423 {
1424 trace_afs_io_error(call->debug_id, -EIO, where);
1425 return -EIO;
1426 }
1427
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1428 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1429 {
1430 trace_afs_file_error(vnode, -EIO, where);
1431 return -EIO;
1432 }
1433
1434 /*****************************************************************************/
1435 /*
1436 * debug tracing
1437 */
1438 extern unsigned afs_debug;
1439
1440 #define dbgprintk(FMT,...) \
1441 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1442
1443 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1444 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1445 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1446
1447
1448 #if defined(__KDEBUG)
1449 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1450 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1451 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1452
1453 #elif defined(CONFIG_AFS_DEBUG)
1454 #define AFS_DEBUG_KENTER 0x01
1455 #define AFS_DEBUG_KLEAVE 0x02
1456 #define AFS_DEBUG_KDEBUG 0x04
1457
1458 #define _enter(FMT,...) \
1459 do { \
1460 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1461 kenter(FMT,##__VA_ARGS__); \
1462 } while (0)
1463
1464 #define _leave(FMT,...) \
1465 do { \
1466 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1467 kleave(FMT,##__VA_ARGS__); \
1468 } while (0)
1469
1470 #define _debug(FMT,...) \
1471 do { \
1472 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1473 kdebug(FMT,##__VA_ARGS__); \
1474 } while (0)
1475
1476 #else
1477 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1478 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1479 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1480 #endif
1481
1482 /*
1483 * debug assertion checking
1484 */
1485 #if 1 // defined(__KDEBUGALL)
1486
1487 #define ASSERT(X) \
1488 do { \
1489 if (unlikely(!(X))) { \
1490 printk(KERN_ERR "\n"); \
1491 printk(KERN_ERR "AFS: Assertion failed\n"); \
1492 BUG(); \
1493 } \
1494 } while(0)
1495
1496 #define ASSERTCMP(X, OP, Y) \
1497 do { \
1498 if (unlikely(!((X) OP (Y)))) { \
1499 printk(KERN_ERR "\n"); \
1500 printk(KERN_ERR "AFS: Assertion failed\n"); \
1501 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1502 (unsigned long)(X), (unsigned long)(Y)); \
1503 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1504 (unsigned long)(X), (unsigned long)(Y)); \
1505 BUG(); \
1506 } \
1507 } while(0)
1508
1509 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1510 do { \
1511 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1512 printk(KERN_ERR "\n"); \
1513 printk(KERN_ERR "AFS: Assertion failed\n"); \
1514 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1515 (unsigned long)(L), (unsigned long)(N), \
1516 (unsigned long)(H)); \
1517 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1518 (unsigned long)(L), (unsigned long)(N), \
1519 (unsigned long)(H)); \
1520 BUG(); \
1521 } \
1522 } while(0)
1523
1524 #define ASSERTIF(C, X) \
1525 do { \
1526 if (unlikely((C) && !(X))) { \
1527 printk(KERN_ERR "\n"); \
1528 printk(KERN_ERR "AFS: Assertion failed\n"); \
1529 BUG(); \
1530 } \
1531 } while(0)
1532
1533 #define ASSERTIFCMP(C, X, OP, Y) \
1534 do { \
1535 if (unlikely((C) && !((X) OP (Y)))) { \
1536 printk(KERN_ERR "\n"); \
1537 printk(KERN_ERR "AFS: Assertion failed\n"); \
1538 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1539 (unsigned long)(X), (unsigned long)(Y)); \
1540 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1541 (unsigned long)(X), (unsigned long)(Y)); \
1542 BUG(); \
1543 } \
1544 } while(0)
1545
1546 #else
1547
1548 #define ASSERT(X) \
1549 do { \
1550 } while(0)
1551
1552 #define ASSERTCMP(X, OP, Y) \
1553 do { \
1554 } while(0)
1555
1556 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1557 do { \
1558 } while(0)
1559
1560 #define ASSERTIF(C, X) \
1561 do { \
1562 } while(0)
1563
1564 #define ASSERTIFCMP(C, X, OP, Y) \
1565 do { \
1566 } while(0)
1567
1568 #endif /* __KDEBUGALL */
1569
