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 rxrpc_call *rxcall; /* RxRPC call handle */
134 struct rxrpc_peer *peer; /* Remote endpoint */
135 struct key *key; /* security for this call */
136 struct afs_net *net; /* The network namespace */
137 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
138 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
139 void *request; /* request data (first part) */
140 size_t iov_len; /* Size of *iter to be used */
141 struct iov_iter def_iter; /* Default buffer/data iterator */
142 struct iov_iter *write_iter; /* Iterator defining write to be made */
143 struct iov_iter *iter; /* Iterator currently in use */
144 union { /* Convenience for ->def_iter */
145 struct kvec kvec[1];
146 struct bio_vec bvec[1];
147 };
148 void *buffer; /* reply receive buffer */
149 union {
150 struct afs_endpoint_state *probe;
151 struct afs_addr_list *vl_probe;
152 struct afs_addr_list *ret_alist;
153 struct afs_vldb_entry *ret_vldb;
154 char *ret_str;
155 };
156 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */
157 unsigned char probe_index; /* Address in ->probe_alist */
158 struct afs_operation *op;
159 unsigned int server_index;
160 refcount_t ref;
161 enum afs_call_state state;
162 spinlock_t state_lock;
163 int error; /* error code */
164 u32 abort_code; /* Remote abort ID or 0 */
165 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
166 unsigned request_size; /* size of request data */
167 unsigned reply_max; /* maximum size of reply */
168 unsigned count2; /* count used in unmarshalling */
169 unsigned char unmarshall; /* unmarshalling phase */
170 bool drop_ref; /* T if need to drop ref for incoming call */
171 bool need_attention; /* T if RxRPC poked us */
172 bool async; /* T if asynchronous */
173 bool upgrade; /* T to request service upgrade */
174 bool intr; /* T if interruptible */
175 bool unmarshalling_error; /* T if an unmarshalling error occurred */
176 bool responded; /* Got a response from the call (may be abort) */
177 u16 service_id; /* Actual service ID (after upgrade) */
178 unsigned int debug_id; /* Trace ID */
179 u32 operation_ID; /* operation ID for an incoming call */
180 u32 count; /* count for use in unmarshalling */
181 union { /* place to extract temporary data */
182 struct {
183 __be32 tmp_u;
184 __be32 tmp;
185 } __attribute__((packed));
186 __be64 tmp64;
187 };
188 ktime_t issue_time; /* Time of issue of operation */
189 };
190
191 struct afs_call_type {
192 const char *name;
193 unsigned int op; /* Really enum afs_fs_operation */
194
195 /* deliver request or reply data to an call
196 * - returning an error will cause the call to be aborted
197 */
198 int (*deliver)(struct afs_call *call);
199
200 /* clean up a call */
201 void (*destructor)(struct afs_call *call);
202
203 /* Work function */
204 void (*work)(struct work_struct *work);
205
206 /* Call done function (gets called immediately on success or failure) */
207 void (*done)(struct afs_call *call);
208 };
209
210 /*
211 * Key available for writeback on a file.
212 */
213 struct afs_wb_key {
214 refcount_t usage;
215 struct key *key;
216 struct list_head vnode_link; /* Link in vnode->wb_keys */
217 };
218
219 /*
220 * AFS open file information record. Pointed to by file->private_data.
221 */
222 struct afs_file {
223 struct key *key; /* The key this file was opened with */
224 struct afs_wb_key *wb; /* Writeback key record for this file */
225 };
226
227 static inline struct key *afs_file_key(struct file *file)
228 {
229 struct afs_file *af = file->private_data;
230
231 return af->key;
232 }
233
234 /*
235 * Record of an outstanding read operation on a vnode.
236 */
237 struct afs_read {
238 loff_t pos; /* Where to start reading */
239 loff_t len; /* How much we're asking for */
240 loff_t actual_len; /* How much we're actually getting */
241 loff_t file_size; /* File size returned by server */
242 struct key *key; /* The key to use to reissue the read */
243 struct afs_vnode *vnode; /* The file being read into. */
244 struct netfs_io_subrequest *subreq; /* Fscache helper read request this belongs to */
245 afs_dataversion_t data_version; /* Version number returned by server */
246 refcount_t usage;
247 unsigned int call_debug_id;
248 unsigned int nr_pages;
249 int error;
250 void (*done)(struct afs_read *);
251 void (*cleanup)(struct afs_read *);
252 struct iov_iter *iter; /* Iterator representing the buffer */
253 struct iov_iter def_iter; /* Default iterator */
254 };
255
256 /*
257 * AFS superblock private data
258 * - there's one superblock per volume
259 */
260 struct afs_super_info {
261 struct net *net_ns; /* Network namespace */
262 struct afs_cell *cell; /* The cell in which the volume resides */
263 struct afs_volume *volume; /* volume record */
264 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
265 bool dyn_root; /* True if dynamic root */
266 };
267
268 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
269 {
270 return sb->s_fs_info;
271 }
272
273 extern struct file_system_type afs_fs_type;
274
275 /*
276 * Set of substitutes for @sys.
277 */
278 struct afs_sysnames {
279 #define AFS_NR_SYSNAME 16
280 char *subs[AFS_NR_SYSNAME];
281 refcount_t usage;
282 unsigned short nr;
283 char blank[1];
284 };
285
286 /*
287 * AFS network namespace record.
288 */
289 struct afs_net {
290 struct net *net; /* Backpointer to the owning net namespace */
291 struct afs_uuid uuid;
292 bool live; /* F if this namespace is being removed */
293
294 /* AF_RXRPC I/O stuff */
295 struct socket *socket;
296 struct afs_call *spare_incoming_call;
297 struct work_struct charge_preallocation_work;
298 struct mutex socket_mutex;
299 atomic_t nr_outstanding_calls;
300 atomic_t nr_superblocks;
301
302 /* Cell database */
303 struct rb_root cells;
304 struct afs_cell *ws_cell;
305 struct work_struct cells_manager;
306 struct timer_list cells_timer;
307 atomic_t cells_outstanding;
308 struct rw_semaphore cells_lock;
309 struct mutex cells_alias_lock;
310
311 struct mutex proc_cells_lock;
312 struct hlist_head proc_cells;
313
314 /* Known servers. Theoretically each fileserver can only be in one
315 * cell, but in practice, people create aliases and subsets and there's
316 * no easy way to distinguish them.
317 */
318 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */
319 struct rb_root fs_servers; /* afs_server (by server UUID or address) */
320 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
321 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
322 struct hlist_head fs_proc; /* procfs servers list */
323
324 struct hlist_head fs_addresses; /* afs_server (by lowest IPv6 addr) */
325 seqlock_t fs_addr_lock; /* For fs_addresses[46] */
326
327 struct work_struct fs_manager;
328 struct timer_list fs_timer;
329
330 struct work_struct fs_prober;
331 struct timer_list fs_probe_timer;
332 atomic_t servers_outstanding;
333
334 /* File locking renewal management */
335 struct mutex lock_manager_mutex;
336
337 /* Misc */
338 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
339 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
340 struct afs_sysnames *sysnames;
341 rwlock_t sysnames_lock;
342 struct afs_addr_preference_list __rcu *address_prefs;
343 u16 address_pref_version;
344
345 /* Statistics counters */
346 atomic_t n_lookup; /* Number of lookups done */
347 atomic_t n_reval; /* Number of dentries needing revalidation */
348 atomic_t n_inval; /* Number of invalidations by the server */
349 atomic_t n_relpg; /* Number of invalidations by release_folio */
350 atomic_t n_read_dir; /* Number of directory pages read */
351 atomic_t n_dir_cr; /* Number of directory entry creation edits */
352 atomic_t n_dir_rm; /* Number of directory entry removal edits */
353 atomic_t n_stores; /* Number of store ops */
354 atomic_long_t n_store_bytes; /* Number of bytes stored */
355 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
356 atomic_t n_fetches; /* Number of data fetch ops */
357 };
358
359 extern const char afs_init_sysname[];
360
361 enum afs_cell_state {
362 AFS_CELL_UNSET,
363 AFS_CELL_ACTIVATING,
364 AFS_CELL_ACTIVE,
365 AFS_CELL_DEACTIVATING,
366 AFS_CELL_INACTIVE,
367 AFS_CELL_FAILED,
368 AFS_CELL_REMOVED,
369 };
370
371 /*
372 * AFS cell record.
373 *
374 * This is a tricky concept to get right as it is possible to create aliases
375 * simply by pointing AFSDB/SRV records for two names at the same set of VL
376 * servers; it is also possible to do things like setting up two sets of VL
377 * servers, one of which provides a superset of the volumes provided by the
378 * other (for internal/external division, for example).
379 *
380 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
381 * servers and (b) a cell's name is used by the client to select the key to use
382 * for authentication and encryption. The cell name is not typically used in
383 * the protocol.
384 *
385 * Two cells are determined to be aliases if they have an explicit alias (YFS
386 * only), share any VL servers in common or have at least one volume in common.
387 * "In common" means that the address list of the VL servers or the fileservers
388 * share at least one endpoint.
389 */
390 struct afs_cell {
391 union {
392 struct rcu_head rcu;
393 struct rb_node net_node; /* Node in net->cells */
394 };
395 struct afs_net *net;
396 struct afs_cell *alias_of; /* The cell this is an alias of */
397 struct afs_volume *root_volume; /* The root.cell volume if there is one */
398 struct key *anonymous_key; /* anonymous user key for this cell */
399 struct work_struct manager; /* Manager for init/deinit/dns */
400 struct hlist_node proc_link; /* /proc cell list link */
401 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
402 time64_t last_inactive; /* Time of last drop of usage count */
403 refcount_t ref; /* Struct refcount */
404 atomic_t active; /* Active usage counter */
405 unsigned long flags;
406 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
407 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
408 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
409 enum afs_cell_state state;
410 short error;
411 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
412 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
413 unsigned int dns_lookup_count; /* Counter of DNS lookups */
414 unsigned int debug_id;
415
416 /* The volumes belonging to this cell */
417 struct rw_semaphore vs_lock; /* Lock for server->volumes */
418 struct rb_root volumes; /* Tree of volumes on this server */
419 struct hlist_head proc_volumes; /* procfs volume list */
420 seqlock_t volume_lock; /* For volumes */
421
422 /* Active fileserver interaction state. */
423 struct rb_root fs_servers; /* afs_server (by server UUID) */
424 seqlock_t fs_lock; /* For fs_servers */
425
426 /* VL server list. */
427 rwlock_t vl_servers_lock; /* Lock on vl_servers */
428 struct afs_vlserver_list __rcu *vl_servers;
429
430 u8 name_len; /* Length of name */
431 char *name; /* Cell name, case-flattened and NUL-padded */
432 };
433
434 /*
435 * Volume Location server record.
436 */
437 struct afs_vlserver {
438 struct rcu_head rcu;
439 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
440 unsigned long flags;
441 #define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
442 #define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
443 #define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
444 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
445 rwlock_t lock; /* Lock on addresses */
446 refcount_t ref;
447 unsigned int rtt; /* Server's current RTT in uS */
448 unsigned int debug_id;
449
450 /* Probe state */
451 wait_queue_head_t probe_wq;
452 atomic_t probe_outstanding;
453 spinlock_t probe_lock;
454 struct {
455 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
456 u32 abort_code;
457 short error;
458 unsigned short flags;
459 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
460 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
461 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
462 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
463 } probe;
464
465 u16 service_id; /* Service ID we're using */
466 u16 port;
467 u16 name_len; /* Length of name */
468 char name[]; /* Server name, case-flattened */
469 };
470
471 /*
472 * Weighted list of Volume Location servers.
473 */
474 struct afs_vlserver_entry {
475 u16 priority; /* Preference (as SRV) */
476 u16 weight; /* Weight (as SRV) */
477 enum dns_record_source source:8;
478 enum dns_lookup_status status:8;
479 struct afs_vlserver *server;
480 };
481
482 struct afs_vlserver_list {
483 struct rcu_head rcu;
484 refcount_t ref;
485 u8 nr_servers;
486 u8 index; /* Server currently in use */
487 u8 preferred; /* Preferred server */
488 enum dns_record_source source:8;
489 enum dns_lookup_status status:8;
490 rwlock_t lock;
491 struct afs_vlserver_entry servers[];
492 };
493
494 /*
495 * Cached VLDB entry.
496 *
497 * This is pointed to by cell->vldb_entries, indexed by name.
498 */
499 struct afs_vldb_entry {
500 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
501
502 unsigned long flags;
503 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
504 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
505 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
506 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
507 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
508
509 uuid_t fs_server[AFS_NMAXNSERVERS];
510 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
511 u8 fs_mask[AFS_NMAXNSERVERS];
512 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
513 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
514 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
515 u8 vlsf_flags[AFS_NMAXNSERVERS];
516 short error;
517 u8 nr_servers; /* Number of server records */
518 u8 name_len;
519 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
520 };
521
522 /*
523 * Fileserver endpoint state. The records the addresses of a fileserver's
524 * endpoints and the state and result of a round of probing on them. This
525 * allows the rotation algorithm to access those results without them being
526 * erased by a subsequent round of probing.
527 */
528 struct afs_endpoint_state {
529 struct rcu_head rcu;
530 struct afs_addr_list *addresses; /* The addresses being probed */
531 unsigned long responsive_set; /* Bitset of responsive endpoints */
532 unsigned long failed_set; /* Bitset of endpoints we failed to probe */
533 refcount_t ref;
534 unsigned int server_id; /* Debug ID of server */
535 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */
536 atomic_t nr_probing; /* Number of outstanding probes */
537 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
538 s32 abort_code;
539 short error;
540 unsigned long flags;
541 #define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */
542 #define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */
543 #define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */
544 #define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */
545 #define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */
546 };
547
548 /*
549 * Record of fileserver with which we're actively communicating.
550 */
551 struct afs_server {
552 struct rcu_head rcu;
553 union {
554 uuid_t uuid; /* Server ID */
555 struct afs_uuid _uuid;
556 };
557
558 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
559 struct rb_node uuid_rb; /* Link in net->fs_servers */
560 struct afs_server __rcu *uuid_next; /* Next server with same UUID */
561 struct afs_server *uuid_prev; /* Previous server with same UUID */
562 struct list_head probe_link; /* Link in net->fs_probe_list */
563 struct hlist_node addr_link; /* Link in net->fs_addresses6 */
564 struct hlist_node proc_link; /* Link in net->fs_proc */
565 struct list_head volumes; /* RCU list of afs_server_entry objects */
566 struct afs_server *gc_next; /* Next server in manager's list */
567 time64_t unuse_time; /* Time at which last unused */
568 unsigned long flags;
569 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
570 #define AFS_SERVER_FL_UPDATING 1
571 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
572 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */
573 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */
574 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */
575 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
576 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
577 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
578 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
579 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
580 refcount_t ref; /* Object refcount */
581 atomic_t active; /* Active user count */
582 u32 addr_version; /* Address list version */
583 u16 service_id; /* Service ID we're using. */
584 unsigned int rtt; /* Server's current RTT in uS */
585 unsigned int debug_id; /* Debugging ID for traces */
586
587 /* file service access */
588 rwlock_t fs_lock; /* access lock */
589
590 /* Probe state */
591 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
592 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
593 wait_queue_head_t probe_wq;
594 unsigned int probe_counter; /* Number of probes issued */
595 spinlock_t probe_lock;
596 };
597
598 enum afs_ro_replicating {
599 AFS_RO_NOT_REPLICATING, /* Not doing replication */
600 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */
601 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */
602 } __mode(byte);
603
604 /*
605 * Replaceable volume server list.
606 */
607 struct afs_server_entry {
608 struct afs_server *server;
609 struct afs_volume *volume;
610 struct list_head slink; /* Link in server->volumes */
611 time64_t cb_expires_at; /* Time at which volume-level callback expires */
612 unsigned long flags;
613 #define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */
614 #define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */
615 #define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */
616 };
617
618 struct afs_server_list {
619 struct rcu_head rcu;
620 refcount_t usage;
621 bool attached; /* T if attached to servers */
622 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */
623 unsigned char nr_servers;
624 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
625 unsigned int seq; /* Set to ->servers_seq when installed */
626 rwlock_t lock;
627 struct afs_server_entry servers[];
628 };
629
630 /*
631 * Live AFS volume management.
632 */
633 struct afs_volume {
634 struct rcu_head rcu;
635 afs_volid_t vid; /* The volume ID of this volume */
636 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
637 refcount_t ref;
638 time64_t update_at; /* Time at which to next update */
639 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
640 struct rb_node cell_node; /* Link in cell->volumes */
641 struct hlist_node proc_link; /* Link in cell->proc_volumes */
642 struct super_block __rcu *sb; /* Superblock on which inodes reside */
643 struct work_struct destructor; /* Deferred destructor */
644 unsigned long flags;
645 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
646 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
647 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
648 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
649 #define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */
650 #define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */
651 #ifdef CONFIG_AFS_FSCACHE
652 struct fscache_volume *cache; /* Caching cookie */
653 #endif
654 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
655 rwlock_t servers_lock; /* Lock for ->servers */
656 unsigned int servers_seq; /* Incremented each time ->servers changes */
657
658 /* RO release tracking */
659 struct mutex volsync_lock; /* Time/state evaluation lock */
660 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */
661 time64_t update_time; /* Volume update time (or TIME64_MIN) */
662
663 /* Callback management */
664 struct mutex cb_check_lock; /* Lock to control race to check after v_break */
665 time64_t cb_expires_at; /* Earliest volume callback expiry time */
666 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */
667 atomic_t cb_v_break; /* Volume-break event counter. */
668 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */
669 atomic_t cb_scrub; /* Scrub-all-data event counter. */
670 rwlock_t cb_v_break_lock;
671 struct rw_semaphore open_mmaps_lock;
672 struct list_head open_mmaps; /* List of vnodes that are mmapped */
673
674 afs_voltype_t type; /* type of volume */
675 char type_force; /* force volume type (suppress R/O -> R/W) */
676 u8 name_len;
677 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
678 };
679
680 enum afs_lock_state {
681 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
682 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
683 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
684 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
685 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
686 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
687 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
688 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
689 };
690
691 /*
692 * AFS inode private data.
693 *
694 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
695 * leak from one inode to another.
696 */
697 struct afs_vnode {
698 struct netfs_inode netfs; /* Netfslib context and vfs inode */
699 struct afs_volume *volume; /* volume on which vnode resides */
700 struct afs_fid fid; /* the file identifier for this inode */
701 struct afs_file_status status; /* AFS status info for this file */
702 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
703 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
704 struct mutex io_lock; /* Lock for serialising I/O on this mutex */
705 struct rw_semaphore validate_lock; /* lock for validating this vnode */
706 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
707 struct key *silly_key; /* Silly rename key */
708 spinlock_t wb_lock; /* lock for wb_keys */
709 spinlock_t lock; /* waitqueue/flags lock */
710 unsigned long flags;
711 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
712 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
713 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
714 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
715 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
716 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
717 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
718 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
719 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
720 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
721
722 struct list_head wb_keys; /* List of keys available for writeback */
723 struct list_head pending_locks; /* locks waiting to be granted */
724 struct list_head granted_locks; /* locks granted on this file */
725 struct delayed_work lock_work; /* work to be done in locking */
726 struct key *lock_key; /* Key to be used in lock ops */
727 ktime_t locked_at; /* Time at which lock obtained */
728 enum afs_lock_state lock_state : 8;
729 afs_lock_type_t lock_type : 8;
730
731 /* outstanding callback notification on this file */
732 struct work_struct cb_work; /* Work for mmap'd files */
733 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
734 void *cb_server; /* Server with callback/filelock */
735 atomic_t cb_nr_mmap; /* Number of mmaps */
736 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */
737 unsigned int cb_scrub; /* Scrub counter on ->volume */
738 unsigned int cb_break; /* Break counter on vnode */
739 unsigned int cb_v_check; /* Break check counter on ->volume */
740 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
741
742 atomic64_t cb_expires_at; /* time at which callback expires */
743 #define AFS_NO_CB_PROMISE TIME64_MIN
744 };
745
746 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
747 {
748 #ifdef CONFIG_AFS_FSCACHE
749 return netfs_i_cookie(&vnode->netfs);
750 #else
751 return NULL;
752 #endif
753 }
754
755 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
756 struct fscache_cookie *cookie)
757 {
758 #ifdef CONFIG_AFS_FSCACHE
759 vnode->netfs.cache = cookie;
760 if (cookie)
761 mapping_set_release_always(vnode->netfs.inode.i_mapping);
762 #endif
763 }
764
765 /*
766 * cached security record for one user's attempt to access a vnode
767 */
768 struct afs_permit {
769 struct key *key; /* RxRPC ticket holding a security context */
770 afs_access_t access; /* CallerAccess value for this key */
771 };
772
773 /*
774 * Immutable cache of CallerAccess records from attempts to access vnodes.
775 * These may be shared between multiple vnodes.
776 */
777 struct afs_permits {
778 struct rcu_head rcu;
779 struct hlist_node hash_node; /* Link in hash */
780 unsigned long h; /* Hash value for this permit list */
781 refcount_t usage;
782 unsigned short nr_permits; /* Number of records */
783 bool invalidated; /* Invalidated due to key change */
784 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
785 };
786
787 /*
788 * Error prioritisation and accumulation.
789 */
790 struct afs_error {
791 s32 abort_code; /* Cumulative abort code */
792 short error; /* Cumulative error */
793 bool responded; /* T if server responded */
794 bool aborted; /* T if ->error is from an abort */
795 };
796
797 /*
798 * Cursor for iterating over a set of volume location servers.
799 */
800 struct afs_vl_cursor {
801 struct afs_cell *cell; /* The cell we're querying */
802 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
803 struct afs_vlserver *server; /* Server on which this resides */
804 struct afs_addr_list *alist; /* Current address list (pins ref) */
805 struct key *key; /* Key for the server */
806 unsigned long untried_servers; /* Bitmask of untried servers */
807 unsigned long addr_tried; /* Tried addresses */
808 struct afs_error cumul_error; /* Cumulative error */
809 unsigned int debug_id;
810 s32 call_abort_code;
811 short call_error; /* Error from single call */
812 short server_index; /* Current server */
813 signed char addr_index; /* Current address */
814 unsigned short flags;
815 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
816 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
817 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
818 short nr_iterations; /* Number of server iterations */
819 bool call_responded; /* T if the current address responded */
820 };
821
822 /*
823 * Fileserver state tracking for an operation. An array of these is kept,
824 * indexed by server index.
825 */
826 struct afs_server_state {
827 /* Tracking of fileserver probe state. Other operations may interfere
828 * by probing a fileserver when accessing other volumes.
829 */
830 unsigned int probe_seq;
831 unsigned long untried_addrs; /* Addresses we haven't tried yet */
832 struct wait_queue_entry probe_waiter;
833 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
834 };
835
836 /*
837 * Fileserver operation methods.
838 */
839 struct afs_operation_ops {
840 void (*issue_afs_rpc)(struct afs_operation *op);
841 void (*issue_yfs_rpc)(struct afs_operation *op);
842 void (*success)(struct afs_operation *op);
843 void (*aborted)(struct afs_operation *op);
844 void (*failed)(struct afs_operation *op);
845 void (*edit_dir)(struct afs_operation *op);
846 void (*put)(struct afs_operation *op);
847 };
848
849 struct afs_vnode_param {
850 struct afs_vnode *vnode;
851 struct afs_fid fid; /* Fid to access */
852 struct afs_status_cb scb; /* Returned status and callback promise */
853 afs_dataversion_t dv_before; /* Data version before the call */
854 unsigned int cb_break_before; /* cb_break before the call */
855 u8 dv_delta; /* Expected change in data version */
856 bool put_vnode:1; /* T if we have a ref on the vnode */
857 bool need_io_lock:1; /* T if we need the I/O lock on this */
858 bool update_ctime:1; /* Need to update the ctime */
859 bool set_size:1; /* Must update i_size */
860 bool op_unlinked:1; /* True if file was unlinked by op */
861 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
862 bool modification:1; /* Set if the content gets modified */
863 };
864
865 /*
866 * Fileserver operation wrapper, handling server and address rotation
867 * asynchronously. May make simultaneous calls to multiple servers.
868 */
869 struct afs_operation {
870 struct afs_net *net; /* Network namespace */
871 struct key *key; /* Key for the cell */
872 const struct afs_call_type *type; /* Type of call done */
873 const struct afs_operation_ops *ops;
874
875 /* Parameters/results for the operation */
876 struct afs_volume *volume; /* Volume being accessed */
877 struct afs_vnode_param file[2];
878 struct afs_vnode_param *more_files;
879 struct afs_volsync pre_volsync; /* Volsync before op */
880 struct afs_volsync volsync; /* Volsync returned by op */
881 struct dentry *dentry; /* Dentry to be altered */
882 struct dentry *dentry_2; /* Second dentry to be altered */
883 struct timespec64 mtime; /* Modification time to record */
884 struct timespec64 ctime; /* Change time to set */
885 struct afs_error cumul_error; /* Cumulative error */
886 short nr_files; /* Number of entries in file[], more_files */
887 unsigned int debug_id;
888
889 unsigned int cb_v_break; /* Volume break counter before op */
890
891 union {
892 struct {
893 int which; /* Which ->file[] to fetch for */
894 } fetch_status;
895 struct {
896 int reason; /* enum afs_edit_dir_reason */
897 mode_t mode;
898 const char *symlink;
899 } create;
900 struct {
901 bool need_rehash;
902 } unlink;
903 struct {
904 struct dentry *rehash;
905 struct dentry *tmp;
906 bool new_negative;
907 } rename;
908 struct {
909 struct afs_read *req;
910 } fetch;
911 struct {
912 afs_lock_type_t type;
913 } lock;
914 struct {
915 struct iov_iter *write_iter;
916 loff_t pos;
917 loff_t size;
918 loff_t i_size;
919 } store;
920 struct {
921 struct iattr *attr;
922 loff_t old_i_size;
923 } setattr;
924 struct afs_acl *acl;
925 struct yfs_acl *yacl;
926 struct {
927 struct afs_volume_status vs;
928 struct kstatfs *buf;
929 } volstatus;
930 };
931
932 /* Fileserver iteration state */
933 struct afs_server_list *server_list; /* Current server list (pins ref) */
934 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
935 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */
936 struct afs_server_state *server_states; /* States of the servers involved */
937 struct afs_call *call;
938 unsigned long untried_servers; /* Bitmask of untried servers */
939 unsigned long addr_tried; /* Tried addresses */
940 s32 call_abort_code; /* Abort code from single call */
941 short call_error; /* Error from single call */
942 short server_index; /* Current server */
943 short nr_iterations; /* Number of server iterations */
944 signed char addr_index; /* Current address */
945 bool call_responded; /* T if the current address responded */
946
947 unsigned int flags;
948 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
949 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
950 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
951 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
952 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
953 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
954 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
955 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
956 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
957 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
958 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
959 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
960 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
961 };
962
963 /*
964 * Cache auxiliary data.
965 */
966 struct afs_vnode_cache_aux {
967 __be64 data_version;
968 } __packed;
969
970 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
971 struct afs_vnode_cache_aux *aux)
972 {
973 aux->data_version = cpu_to_be64(vnode->status.data_version);
974 }
975
976 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
977 {
978 struct afs_vnode_cache_aux aux;
979
980 afs_set_cache_aux(vnode, &aux);
981 fscache_invalidate(afs_vnode_cache(vnode), &aux,
982 i_size_read(&vnode->netfs.inode), flags);
983 }
984
985 #include <trace/events/afs.h>
986
987 /*****************************************************************************/
988 /*
989 * addr_list.c
990 */
991 struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
992 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
993 extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
994 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
995 const char *, size_t, char,
996 unsigned short, unsigned short);
997 bool afs_addr_list_same(const struct afs_addr_list *a,
998 const struct afs_addr_list *b);
999 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
1000
1001 extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1002 __be32 xdr, u16 port);
1003 extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1004 __be32 *xdr, u16 port);
1005
1006 /*
1007 * addr_prefs.c
1008 */
1009 int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1010 void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1011 void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
1012
1013 /*
1014 * callback.c
1015 */
1016 extern void afs_invalidate_mmap_work(struct work_struct *);
1017 extern void afs_init_callback_state(struct afs_server *);
1018 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1019 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1020 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1021
1022 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1023 {
1024 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1025 }
1026
1027 static inline bool afs_cb_is_broken(unsigned int cb_break,
1028 const struct afs_vnode *vnode)
1029 {
1030 return cb_break != (vnode->cb_break +
1031 atomic_read(&vnode->volume->cb_ro_snapshot) +
1032 atomic_read(&vnode->volume->cb_scrub));
1033 }
1034
1035 /*
1036 * cell.c
1037 */
1038 extern int afs_cell_init(struct afs_net *, const char *);
1039 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1040 enum afs_cell_trace);
1041 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1042 const char *, bool);
1043 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1044 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1045 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1046 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1047 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1048 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1049 extern void afs_manage_cells(struct work_struct *);
1050 extern void afs_cells_timer(struct timer_list *);
1051 extern void __net_exit afs_cell_purge(struct afs_net *);
1052
1053 /*
1054 * cmservice.c
1055 */
1056 extern bool afs_cm_incoming_call(struct afs_call *);
1057
1058 /*
1059 * dir.c
1060 */
1061 extern const struct file_operations afs_dir_file_operations;
1062 extern const struct inode_operations afs_dir_inode_operations;
1063 extern const struct address_space_operations afs_dir_aops;
1064 extern const struct dentry_operations afs_fs_dentry_operations;
1065
1066 extern void afs_d_release(struct dentry *);
1067 extern void afs_check_for_remote_deletion(struct afs_operation *);
1068
1069 /*
1070 * dir_edit.c
1071 */
1072 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1073 enum afs_edit_dir_reason);
1074 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1075
1076 /*
1077 * dir_silly.c
1078 */
1079 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1080 struct dentry *, struct key *);
1081 extern int afs_silly_iput(struct dentry *, struct inode *);
1082
1083 /*
1084 * dynroot.c
1085 */
1086 extern const struct inode_operations afs_dynroot_inode_operations;
1087 extern const struct dentry_operations afs_dynroot_dentry_operations;
1088
1089 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1090 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1091 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1092 extern int afs_dynroot_populate(struct super_block *);
1093 extern void afs_dynroot_depopulate(struct super_block *);
1094
1095 /*
1096 * file.c
1097 */
1098 extern const struct address_space_operations afs_file_aops;
1099 extern const struct address_space_operations afs_symlink_aops;
1100 extern const struct inode_operations afs_file_inode_operations;
1101 extern const struct file_operations afs_file_operations;
1102 extern const struct netfs_request_ops afs_req_ops;
1103
1104 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1105 extern void afs_put_wb_key(struct afs_wb_key *);
1106 extern int afs_open(struct inode *, struct file *);
1107 extern int afs_release(struct inode *, struct file *);
1108 extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
1109 extern struct afs_read *afs_alloc_read(gfp_t);
1110 extern void afs_put_read(struct afs_read *);
1111
1112 static inline struct afs_read *afs_get_read(struct afs_read *req)
1113 {
1114 refcount_inc(&req->usage);
1115 return req;
1116 }
1117
1118 /*
1119 * flock.c
1120 */
1121 extern struct workqueue_struct *afs_lock_manager;
1122
1123 extern void afs_lock_op_done(struct afs_call *);
1124 extern void afs_lock_work(struct work_struct *);
1125 extern void afs_lock_may_be_available(struct afs_vnode *);
1126 extern int afs_lock(struct file *, int, struct file_lock *);
1127 extern int afs_flock(struct file *, int, struct file_lock *);
1128
1129 /*
1130 * fsclient.c
1131 */
1132 extern void afs_fs_fetch_status(struct afs_operation *);
1133 extern void afs_fs_fetch_data(struct afs_operation *);
1134 extern void afs_fs_create_file(struct afs_operation *);
1135 extern void afs_fs_make_dir(struct afs_operation *);
1136 extern void afs_fs_remove_file(struct afs_operation *);
1137 extern void afs_fs_remove_dir(struct afs_operation *);
1138 extern void afs_fs_link(struct afs_operation *);
1139 extern void afs_fs_symlink(struct afs_operation *);
1140 extern void afs_fs_rename(struct afs_operation *);
1141 extern void afs_fs_store_data(struct afs_operation *);
1142 extern void afs_fs_setattr(struct afs_operation *);
1143 extern void afs_fs_get_volume_status(struct afs_operation *);
1144 extern void afs_fs_set_lock(struct afs_operation *);
1145 extern void afs_fs_extend_lock(struct afs_operation *);
1146 extern void afs_fs_release_lock(struct afs_operation *);
1147 int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1148 struct afs_address *addr, struct key *key);
1149 bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1150 struct afs_endpoint_state *estate, unsigned int addr_index,
1151 struct key *key);
1152 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1153
1154 struct afs_acl {
1155 u32 size;
1156 u8 data[] __counted_by(size);
1157 };
1158
1159 extern void afs_fs_fetch_acl(struct afs_operation *);
1160 extern void afs_fs_store_acl(struct afs_operation *);
1161
1162 /*
1163 * fs_operation.c
1164 */
1165 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1166 extern int afs_put_operation(struct afs_operation *);
1167 extern bool afs_begin_vnode_operation(struct afs_operation *);
1168 extern void afs_wait_for_operation(struct afs_operation *);
1169 extern int afs_do_sync_operation(struct afs_operation *);
1170
1171 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1172 struct afs_vnode *vnode)
1173 {
1174 op->file[n].vnode = vnode;
1175 op->file[n].need_io_lock = true;
1176 }
1177
1178 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1179 const struct afs_fid *fid)
1180 {
1181 op->file[n].fid = *fid;
1182 }
1183
1184 /*
1185 * fs_probe.c
1186 */
1187 struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1188 enum afs_estate_trace where);
1189 void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1190 extern void afs_fileserver_probe_result(struct afs_call *);
1191 void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1192 struct afs_addr_list *new_addrs, struct key *key);
1193 int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1194 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1195 extern void afs_fs_probe_dispatcher(struct work_struct *);
1196 int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1197 unsigned long exclude, bool is_intr);
1198 extern void afs_fs_probe_cleanup(struct afs_net *);
1199
1200 /*
1201 * inode.c
1202 */
1203 extern const struct afs_operation_ops afs_fetch_status_operation;
1204
1205 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1206 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1207 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1208 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1209 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1210 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1211 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
1212 struct kstat *, u32, unsigned int);
1213 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1214 extern void afs_evict_inode(struct inode *);
1215 extern int afs_drop_inode(struct inode *);
1216
1217 /*
1218 * main.c
1219 */
1220 extern struct workqueue_struct *afs_wq;
1221 extern int afs_net_id;
1222
1223 static inline struct afs_net *afs_net(struct net *net)
1224 {
1225 return net_generic(net, afs_net_id);
1226 }
1227
1228 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1229 {
1230 return afs_net(AFS_FS_S(sb)->net_ns);
1231 }
1232
1233 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1234 {
1235 return afs_sb2net(dentry->d_sb);
1236 }
1237
1238 static inline struct afs_net *afs_i2net(struct inode *inode)
1239 {
1240 return afs_sb2net(inode->i_sb);
1241 }
1242
1243 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1244 {
1245 return afs_i2net(&vnode->netfs.inode);
1246 }
1247
1248 static inline struct afs_net *afs_sock2net(struct sock *sk)
1249 {
1250 return net_generic(sock_net(sk), afs_net_id);
1251 }
1252
1253 static inline void __afs_stat(atomic_t *s)
1254 {
1255 atomic_inc(s);
1256 }
1257
1258 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1259
1260 /*
1261 * misc.c
1262 */
1263 extern int afs_abort_to_error(u32);
1264 extern void afs_prioritise_error(struct afs_error *, int, u32);
1265
1266 static inline void afs_op_nomem(struct afs_operation *op)
1267 {
1268 op->cumul_error.error = -ENOMEM;
1269 }
1270
1271 static inline int afs_op_error(const struct afs_operation *op)
1272 {
1273 return op->cumul_error.error;
1274 }
1275
1276 static inline s32 afs_op_abort_code(const struct afs_operation *op)
1277 {
1278 return op->cumul_error.abort_code;
1279 }
1280
1281 static inline int afs_op_set_error(struct afs_operation *op, int error)
1282 {
1283 return op->cumul_error.error = error;
1284 }
1285
1286 static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1287 {
1288 afs_prioritise_error(&op->cumul_error, error, abort_code);
1289 }
1290
1291 /*
1292 * mntpt.c
1293 */
1294 extern const struct inode_operations afs_mntpt_inode_operations;
1295 extern const struct inode_operations afs_autocell_inode_operations;
1296 extern const struct file_operations afs_mntpt_file_operations;
1297
1298 extern struct vfsmount *afs_d_automount(struct path *);
1299 extern void afs_mntpt_kill_timer(void);
1300
1301 /*
1302 * proc.c
1303 */
1304 #ifdef CONFIG_PROC_FS
1305 extern int __net_init afs_proc_init(struct afs_net *);
1306 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1307 extern int afs_proc_cell_setup(struct afs_cell *);
1308 extern void afs_proc_cell_remove(struct afs_cell *);
1309 extern void afs_put_sysnames(struct afs_sysnames *);
1310 #else
1311 static inline int afs_proc_init(struct afs_net *net) { return 0; }
1312 static inline void afs_proc_cleanup(struct afs_net *net) {}
1313 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
1314 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
1315 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1316 #endif
1317
1318 /*
1319 * rotate.c
1320 */
1321 void afs_clear_server_states(struct afs_operation *op);
1322 extern bool afs_select_fileserver(struct afs_operation *);
1323 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1324
1325 /*
1326 * rxrpc.c
1327 */
1328 extern struct workqueue_struct *afs_async_calls;
1329
1330 extern int __net_init afs_open_socket(struct afs_net *);
1331 extern void __net_exit afs_close_socket(struct afs_net *);
1332 extern void afs_charge_preallocation(struct work_struct *);
1333 extern void afs_put_call(struct afs_call *);
1334 void afs_make_call(struct afs_call *call, gfp_t gfp);
1335 void afs_wait_for_call_to_complete(struct afs_call *call);
1336 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1337 const struct afs_call_type *,
1338 size_t, size_t);
1339 extern void afs_flat_call_destructor(struct afs_call *);
1340 extern void afs_send_empty_reply(struct afs_call *);
1341 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1342 extern int afs_extract_data(struct afs_call *, bool);
1343 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1344
1345 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1346 gfp_t gfp)
1347 {
1348 struct afs_addr_list *alist = op->estate->addresses;
1349
1350 op->call = call;
1351 op->type = call->type;
1352 call->op = op;
1353 call->key = op->key;
1354 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1355 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1356 call->service_id = op->server->service_id;
1357 afs_make_call(call, gfp);
1358 }
1359
1360 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1361 {
1362 call->iov_len = size;
1363 call->kvec[0].iov_base = buf;
1364 call->kvec[0].iov_len = size;
1365 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1366 }
1367
1368 static inline void afs_extract_to_tmp(struct afs_call *call)
1369 {
1370 call->iov_len = sizeof(call->tmp);
1371 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1372 }
1373
1374 static inline void afs_extract_to_tmp64(struct afs_call *call)
1375 {
1376 call->iov_len = sizeof(call->tmp64);
1377 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1378 }
1379
1380 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1381 {
1382 call->iov_len = size;
1383 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1384 }
1385
1386 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1387 {
1388 call->iov_len = size;
1389 afs_extract_begin(call, call->buffer, size);
1390 }
1391
1392 static inline int afs_transfer_reply(struct afs_call *call)
1393 {
1394 return afs_extract_data(call, false);
1395 }
1396
1397 static inline bool afs_check_call_state(struct afs_call *call,
1398 enum afs_call_state state)
1399 {
1400 return READ_ONCE(call->state) == state;
1401 }
1402
1403 static inline bool afs_set_call_state(struct afs_call *call,
1404 enum afs_call_state from,
1405 enum afs_call_state to)
1406 {
1407 bool ok = false;
1408
1409 spin_lock_bh(&call->state_lock);
1410 if (call->state == from) {
1411 call->state = to;
1412 trace_afs_call_state(call, from, to, 0, 0);
1413 ok = true;
1414 }
1415 spin_unlock_bh(&call->state_lock);
1416 return ok;
1417 }
1418
1419 static inline void afs_set_call_complete(struct afs_call *call,
1420 int error, u32 remote_abort)
1421 {
1422 enum afs_call_state state;
1423 bool ok = false;
1424
1425 spin_lock_bh(&call->state_lock);
1426 state = call->state;
1427 if (state != AFS_CALL_COMPLETE) {
1428 call->abort_code = remote_abort;
1429 call->error = error;
1430 call->state = AFS_CALL_COMPLETE;
1431 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1432 error, remote_abort);
1433 ok = true;
1434 }
1435 spin_unlock_bh(&call->state_lock);
1436 if (ok) {
1437 trace_afs_call_done(call);
1438
1439 /* Asynchronous calls have two refs to release - one from the alloc and
1440 * one queued with the work item - and we can't just deallocate the
1441 * call because the work item may be queued again.
1442 */
1443 if (call->drop_ref)
1444 afs_put_call(call);
1445 }
1446 }
1447
1448 /*
1449 * security.c
1450 */
1451 extern void afs_put_permits(struct afs_permits *);
1452 extern void afs_clear_permits(struct afs_vnode *);
1453 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1454 struct afs_status_cb *);
1455 extern struct key *afs_request_key(struct afs_cell *);
1456 extern struct key *afs_request_key_rcu(struct afs_cell *);
1457 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1458 extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1459 extern void __exit afs_clean_up_permit_cache(void);
1460
1461 /*
1462 * server.c
1463 */
1464 extern spinlock_t afs_server_peer_lock;
1465
1466 extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *);
1467 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1468 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1469 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1470 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1471 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1472 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1473 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1474 extern void afs_manage_servers(struct work_struct *);
1475 extern void afs_servers_timer(struct timer_list *);
1476 extern void afs_fs_probe_timer(struct timer_list *);
1477 extern void __net_exit afs_purge_servers(struct afs_net *);
1478 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1479
1480 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1481 {
1482 atomic_inc(&net->servers_outstanding);
1483 }
1484
1485 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1486 {
1487 if (atomic_dec_and_test(&net->servers_outstanding))
1488 wake_up_var(&net->servers_outstanding);
1489 }
1490
1491 static inline bool afs_is_probing_server(struct afs_server *server)
1492 {
1493 return list_empty(&server->probe_link);
1494 }
1495
1496 /*
1497 * server_list.c
1498 */
1499 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1500 {
1501 refcount_inc(&slist->usage);
1502 return slist;
1503 }
1504
1505 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1506 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1507 struct key *key,
1508 struct afs_vldb_entry *vldb);
1509 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1510 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1511 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1512 struct afs_server_list *old);
1513 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1514
1515 /*
1516 * super.c
1517 */
1518 extern int __init afs_fs_init(void);
1519 extern void afs_fs_exit(void);
1520
1521 /*
1522 * validation.c
1523 */
1524 bool afs_check_validity(const struct afs_vnode *vnode);
1525 int afs_update_volume_state(struct afs_operation *op);
1526 int afs_validate(struct afs_vnode *vnode, struct key *key);
1527
1528 /*
1529 * vlclient.c
1530 */
1531 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1532 const char *, int);
1533 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1534 struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1535 struct afs_addr_list *alist,
1536 unsigned int addr_index,
1537 struct key *key,
1538 struct afs_vlserver *server,
1539 unsigned int server_index);
1540 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1541 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1542
1543 /*
1544 * vl_alias.c
1545 */
1546 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1547
1548 /*
1549 * vl_probe.c
1550 */
1551 extern void afs_vlserver_probe_result(struct afs_call *);
1552 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1553 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1554
1555 /*
1556 * vl_rotate.c
1557 */
1558 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1559 struct afs_cell *, struct key *);
1560 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1561 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1562 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1563
1564 /*
1565 * vlserver_list.c
1566 */
1567 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1568 {
1569 refcount_inc(&vlserver->ref);
1570 return vlserver;
1571 }
1572
1573 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1574 {
1575 if (vllist)
1576 refcount_inc(&vllist->ref);
1577 return vllist;
1578 }
1579
1580 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1581 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1582 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1583 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1584 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1585 const void *, size_t);
1586
1587 /*
1588 * volume.c
1589 */
1590 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1591 extern int afs_activate_volume(struct afs_volume *);
1592 extern void afs_deactivate_volume(struct afs_volume *);
1593 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1594 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1595 void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1596 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1597
1598 /*
1599 * write.c
1600 */
1601 void afs_prepare_write(struct netfs_io_subrequest *subreq);
1602 void afs_issue_write(struct netfs_io_subrequest *subreq);
1603 void afs_begin_writeback(struct netfs_io_request *wreq);
1604 void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
1605 extern int afs_writepages(struct address_space *, struct writeback_control *);
1606 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1607 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1608 extern void afs_prune_wb_keys(struct afs_vnode *);
1609
1610 /*
1611 * xattr.c
1612 */
1613 extern const struct xattr_handler * const afs_xattr_handlers[];
1614
1615 /*
1616 * yfsclient.c
1617 */
1618 extern void yfs_fs_fetch_data(struct afs_operation *);
1619 extern void yfs_fs_create_file(struct afs_operation *);
1620 extern void yfs_fs_make_dir(struct afs_operation *);
1621 extern void yfs_fs_remove_file2(struct afs_operation *);
1622 extern void yfs_fs_remove_file(struct afs_operation *);
1623 extern void yfs_fs_remove_dir(struct afs_operation *);
1624 extern void yfs_fs_link(struct afs_operation *);
1625 extern void yfs_fs_symlink(struct afs_operation *);
1626 extern void yfs_fs_rename(struct afs_operation *);
1627 extern void yfs_fs_store_data(struct afs_operation *);
1628 extern void yfs_fs_setattr(struct afs_operation *);
1629 extern void yfs_fs_get_volume_status(struct afs_operation *);
1630 extern void yfs_fs_set_lock(struct afs_operation *);
1631 extern void yfs_fs_extend_lock(struct afs_operation *);
1632 extern void yfs_fs_release_lock(struct afs_operation *);
1633 extern void yfs_fs_fetch_status(struct afs_operation *);
1634 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1635
1636 struct yfs_acl {
1637 struct afs_acl *acl; /* Dir/file/symlink ACL */
1638 struct afs_acl *vol_acl; /* Whole volume ACL */
1639 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1640 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1641 unsigned int flags;
1642 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1643 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1644 };
1645
1646 extern void yfs_free_opaque_acl(struct yfs_acl *);
1647 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1648 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1649
1650 /*
1651 * Miscellaneous inline functions.
1652 */
1653 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1654 {
1655 return container_of(inode, struct afs_vnode, netfs.inode);
1656 }
1657
1658 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1659 {
1660 return &vnode->netfs.inode;
1661 }
1662
1663 /*
1664 * Note that a dentry got changed. We need to set d_fsdata to the data version
1665 * number derived from the result of the operation. It doesn't matter if
1666 * d_fsdata goes backwards as we'll just revalidate.
1667 */
1668 static inline void afs_update_dentry_version(struct afs_operation *op,
1669 struct afs_vnode_param *dir_vp,
1670 struct dentry *dentry)
1671 {
1672 if (!op->cumul_error.error)
1673 dentry->d_fsdata =
1674 (void *)(unsigned long)dir_vp->scb.status.data_version;
1675 }
1676
1677 /*
1678 * Set the file size and block count. Estimate the number of 512 bytes blocks
1679 * used, rounded up to nearest 1K for consistency with other AFS clients.
1680 */
1681 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1682 {
1683 i_size_write(&vnode->netfs.inode, size);
1684 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1685 }
1686
1687 /*
1688 * Check for a conflicting operation on a directory that we just unlinked from.
1689 * If someone managed to sneak a link or an unlink in on the file we just
1690 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1691 */
1692 static inline void afs_check_dir_conflict(struct afs_operation *op,
1693 struct afs_vnode_param *dvp)
1694 {
1695 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1696 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1697 }
1698
1699 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1700 {
1701 trace_afs_io_error(call->debug_id, -EIO, where);
1702 return -EIO;
1703 }
1704
1705 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1706 {
1707 trace_afs_file_error(vnode, -EIO, where);
1708 return -EIO;
1709 }
1710
1711 /*****************************************************************************/
1712 /*
1713 * debug tracing
1714 */
1715 extern unsigned afs_debug;
1716
1717 #define dbgprintk(FMT,...) \
1718 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1719
1720 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1721 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1722 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1723
1724
1725 #if defined(__KDEBUG)
1726 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1727 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1728 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1729
1730 #elif defined(CONFIG_AFS_DEBUG)
1731 #define AFS_DEBUG_KENTER 0x01
1732 #define AFS_DEBUG_KLEAVE 0x02
1733 #define AFS_DEBUG_KDEBUG 0x04
1734
1735 #define _enter(FMT,...) \
1736 do { \
1737 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1738 kenter(FMT,##__VA_ARGS__); \
1739 } while (0)
1740
1741 #define _leave(FMT,...) \
1742 do { \
1743 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1744 kleave(FMT,##__VA_ARGS__); \
1745 } while (0)
1746
1747 #define _debug(FMT,...) \
1748 do { \
1749 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1750 kdebug(FMT,##__VA_ARGS__); \
1751 } while (0)
1752
1753 #else
1754 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1755 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1756 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1757 #endif
1758
1759 /*
1760 * debug assertion checking
1761 */
1762 #if 1 // defined(__KDEBUGALL)
1763
1764 #define ASSERT(X) \
1765 do { \
1766 if (unlikely(!(X))) { \
1767 printk(KERN_ERR "\n"); \
1768 printk(KERN_ERR "AFS: Assertion failed\n"); \
1769 BUG(); \
1770 } \
1771 } while(0)
1772
1773 #define ASSERTCMP(X, OP, Y) \
1774 do { \
1775 if (unlikely(!((X) OP (Y)))) { \
1776 printk(KERN_ERR "\n"); \
1777 printk(KERN_ERR "AFS: Assertion failed\n"); \
1778 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1779 (unsigned long)(X), (unsigned long)(Y)); \
1780 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1781 (unsigned long)(X), (unsigned long)(Y)); \
1782 BUG(); \
1783 } \
1784 } while(0)
1785
1786 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1787 do { \
1788 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1789 printk(KERN_ERR "\n"); \
1790 printk(KERN_ERR "AFS: Assertion failed\n"); \
1791 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1792 (unsigned long)(L), (unsigned long)(N), \
1793 (unsigned long)(H)); \
1794 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1795 (unsigned long)(L), (unsigned long)(N), \
1796 (unsigned long)(H)); \
1797 BUG(); \
1798 } \
1799 } while(0)
1800
1801 #define ASSERTIF(C, X) \
1802 do { \
1803 if (unlikely((C) && !(X))) { \
1804 printk(KERN_ERR "\n"); \
1805 printk(KERN_ERR "AFS: Assertion failed\n"); \
1806 BUG(); \
1807 } \
1808 } while(0)
1809
1810 #define ASSERTIFCMP(C, X, OP, Y) \
1811 do { \
1812 if (unlikely((C) && !((X) OP (Y)))) { \
1813 printk(KERN_ERR "\n"); \
1814 printk(KERN_ERR "AFS: Assertion failed\n"); \
1815 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1816 (unsigned long)(X), (unsigned long)(Y)); \
1817 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1818 (unsigned long)(X), (unsigned long)(Y)); \
1819 BUG(); \
1820 } \
1821 } while(0)
1822
1823 #else
1824
1825 #define ASSERT(X) \
1826 do { \
1827 } while(0)
1828
1829 #define ASSERTCMP(X, OP, Y) \
1830 do { \
1831 } while(0)
1832
1833 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1834 do { \
1835 } while(0)
1836
1837 #define ASSERTIF(C, X) \
1838 do { \
1839 } while(0)
1840
1841 #define ASSERTIFCMP(C, X, OP, Y) \
1842 do { \
1843 } while(0)
1844
1845 #endif /* __KDEBUGALL */
1846
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