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
37 /*
38 * Partial file-locking emulation mode. (The problem being that AFS3 only
39 * allows whole-file locks and no upgrading/downgrading).
40 */
41 enum afs_flock_mode {
42 afs_flock_mode_unset,
43 afs_flock_mode_local, /* Local locking only */
44 afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
45 afs_flock_mode_strict, /* Always get a server lock for a partial lock */
46 afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
47 };
48
49 struct afs_fs_context {
50 bool force; /* T to force cell type */
51 bool autocell; /* T if set auto mount operation */
52 bool dyn_root; /* T if dynamic root */
53 bool no_cell; /* T if the source is "none" (for dynroot) */
54 enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
55 afs_voltype_t type; /* type of volume requested */
56 unsigned int volnamesz; /* size of volume name */
57 const char *volname; /* name of volume to mount */
58 struct afs_net *net; /* the AFS net namespace stuff */
59 struct afs_cell *cell; /* cell in which to find volume */
60 struct afs_volume *volume; /* volume record */
61 struct key *key; /* key to use for secure mounting */
62 };
63
64 enum afs_call_state {
65 AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
66 AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
67 AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
68 AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
69 AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
70 AFS_CALL_SV_REPLYING, /* Server: Replying */
71 AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
72 AFS_CALL_COMPLETE, /* Completed or failed */
73 };
74
75 /*
76 * List of server addresses.
77 */
78 struct afs_addr_list {
79 struct rcu_head rcu;
80 refcount_t usage;
81 u32 version; /* Version */
82 unsigned char max_addrs;
83 unsigned char nr_addrs;
84 unsigned char preferred; /* Preferred address */
85 unsigned char nr_ipv4; /* Number of IPv4 addresses */
86 enum dns_record_source source:8;
87 enum dns_lookup_status status:8;
88 unsigned long failed; /* Mask of addrs that failed locally/ICMP */
89 unsigned long responded; /* Mask of addrs that responded */
90 struct sockaddr_rxrpc addrs[];
91 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
92 };
93
94 /*
95 * a record of an in-progress RxRPC call
96 */
97 struct afs_call {
98 const struct afs_call_type *type; /* type of call */
99 struct afs_addr_list *alist; /* Address is alist[addr_ix] */
100 wait_queue_head_t waitq; /* processes awaiting completion */
101 struct work_struct async_work; /* async I/O processor */
102 struct work_struct work; /* actual work processor */
103 struct rxrpc_call *rxcall; /* RxRPC call handle */
104 struct key *key; /* security for this call */
105 struct afs_net *net; /* The network namespace */
106 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
107 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
108 void *request; /* request data (first part) */
109 size_t iov_len; /* Size of *iter to be used */
110 struct iov_iter def_iter; /* Default buffer/data iterator */
111 struct iov_iter *write_iter; /* Iterator defining write to be made */
112 struct iov_iter *iter; /* Iterator currently in use */
113 union { /* Convenience for ->def_iter */
114 struct kvec kvec[1];
115 struct bio_vec bvec[1];
116 };
117 void *buffer; /* reply receive buffer */
118 union {
119 long ret0; /* Value to reply with instead of 0 */
120 struct afs_addr_list *ret_alist;
121 struct afs_vldb_entry *ret_vldb;
122 char *ret_str;
123 };
124 struct afs_operation *op;
125 unsigned int server_index;
126 refcount_t ref;
127 enum afs_call_state state;
128 spinlock_t state_lock;
129 int error; /* error code */
130 u32 abort_code; /* Remote abort ID or 0 */
131 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
132 unsigned request_size; /* size of request data */
133 unsigned reply_max; /* maximum size of reply */
134 unsigned count2; /* count used in unmarshalling */
135 unsigned char unmarshall; /* unmarshalling phase */
136 unsigned char addr_ix; /* Address in ->alist */
137 bool drop_ref; /* T if need to drop ref for incoming call */
138 bool need_attention; /* T if RxRPC poked us */
139 bool async; /* T if asynchronous */
140 bool upgrade; /* T to request service upgrade */
141 bool intr; /* T if interruptible */
142 bool unmarshalling_error; /* T if an unmarshalling error occurred */
143 u16 service_id; /* Actual service ID (after upgrade) */
144 unsigned int debug_id; /* Trace ID */
145 u32 operation_ID; /* operation ID for an incoming call */
146 u32 count; /* count for use in unmarshalling */
147 union { /* place to extract temporary data */
148 struct {
149 __be32 tmp_u;
150 __be32 tmp;
151 } __attribute__((packed));
152 __be64 tmp64;
153 };
154 ktime_t issue_time; /* Time of issue of operation */
155 };
156
157 struct afs_call_type {
158 const char *name;
159 unsigned int op; /* Really enum afs_fs_operation */
160
161 /* deliver request or reply data to an call
162 * - returning an error will cause the call to be aborted
163 */
164 int (*deliver)(struct afs_call *call);
165
166 /* clean up a call */
167 void (*destructor)(struct afs_call *call);
168
169 /* Work function */
170 void (*work)(struct work_struct *work);
171
172 /* Call done function (gets called immediately on success or failure) */
173 void (*done)(struct afs_call *call);
174 };
175
176 /*
177 * Key available for writeback on a file.
178 */
179 struct afs_wb_key {
180 refcount_t usage;
181 struct key *key;
182 struct list_head vnode_link; /* Link in vnode->wb_keys */
183 };
184
185 /*
186 * AFS open file information record. Pointed to by file->private_data.
187 */
188 struct afs_file {
189 struct key *key; /* The key this file was opened with */
190 struct afs_wb_key *wb; /* Writeback key record for this file */
191 };
192
afs_file_key(struct file * file)193 static inline struct key *afs_file_key(struct file *file)
194 {
195 struct afs_file *af = file->private_data;
196
197 return af->key;
198 }
199
200 /*
201 * Record of an outstanding read operation on a vnode.
202 */
203 struct afs_read {
204 loff_t pos; /* Where to start reading */
205 loff_t len; /* How much we're asking for */
206 loff_t actual_len; /* How much we're actually getting */
207 loff_t file_size; /* File size returned by server */
208 struct key *key; /* The key to use to reissue the read */
209 struct afs_vnode *vnode; /* The file being read into. */
210 struct netfs_io_subrequest *subreq; /* Fscache helper read request this belongs to */
211 afs_dataversion_t data_version; /* Version number returned by server */
212 refcount_t usage;
213 unsigned int call_debug_id;
214 unsigned int nr_pages;
215 int error;
216 void (*done)(struct afs_read *);
217 void (*cleanup)(struct afs_read *);
218 struct iov_iter *iter; /* Iterator representing the buffer */
219 struct iov_iter def_iter; /* Default iterator */
220 };
221
222 /*
223 * AFS superblock private data
224 * - there's one superblock per volume
225 */
226 struct afs_super_info {
227 struct net *net_ns; /* Network namespace */
228 struct afs_cell *cell; /* The cell in which the volume resides */
229 struct afs_volume *volume; /* volume record */
230 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
231 bool dyn_root; /* True if dynamic root */
232 };
233
AFS_FS_S(struct super_block * sb)234 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
235 {
236 return sb->s_fs_info;
237 }
238
239 extern struct file_system_type afs_fs_type;
240
241 /*
242 * Set of substitutes for @sys.
243 */
244 struct afs_sysnames {
245 #define AFS_NR_SYSNAME 16
246 char *subs[AFS_NR_SYSNAME];
247 refcount_t usage;
248 unsigned short nr;
249 char blank[1];
250 };
251
252 /*
253 * AFS network namespace record.
254 */
255 struct afs_net {
256 struct net *net; /* Backpointer to the owning net namespace */
257 struct afs_uuid uuid;
258 bool live; /* F if this namespace is being removed */
259
260 /* AF_RXRPC I/O stuff */
261 struct socket *socket;
262 struct afs_call *spare_incoming_call;
263 struct work_struct charge_preallocation_work;
264 struct mutex socket_mutex;
265 atomic_t nr_outstanding_calls;
266 atomic_t nr_superblocks;
267
268 /* Cell database */
269 struct rb_root cells;
270 struct afs_cell *ws_cell;
271 struct work_struct cells_manager;
272 struct timer_list cells_timer;
273 atomic_t cells_outstanding;
274 struct rw_semaphore cells_lock;
275 struct mutex cells_alias_lock;
276
277 struct mutex proc_cells_lock;
278 struct hlist_head proc_cells;
279
280 /* Known servers. Theoretically each fileserver can only be in one
281 * cell, but in practice, people create aliases and subsets and there's
282 * no easy way to distinguish them.
283 */
284 seqlock_t fs_lock; /* For fs_servers, fs_probe_*, fs_proc */
285 struct rb_root fs_servers; /* afs_server (by server UUID or address) */
286 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
287 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
288 struct hlist_head fs_proc; /* procfs servers list */
289
290 struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */
291 struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */
292 seqlock_t fs_addr_lock; /* For fs_addresses[46] */
293
294 struct work_struct fs_manager;
295 struct timer_list fs_timer;
296
297 struct work_struct fs_prober;
298 struct timer_list fs_probe_timer;
299 atomic_t servers_outstanding;
300
301 /* File locking renewal management */
302 struct mutex lock_manager_mutex;
303
304 /* Misc */
305 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
306 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
307 struct afs_sysnames *sysnames;
308 rwlock_t sysnames_lock;
309
310 /* Statistics counters */
311 atomic_t n_lookup; /* Number of lookups done */
312 atomic_t n_reval; /* Number of dentries needing revalidation */
313 atomic_t n_inval; /* Number of invalidations by the server */
314 atomic_t n_relpg; /* Number of invalidations by release_folio */
315 atomic_t n_read_dir; /* Number of directory pages read */
316 atomic_t n_dir_cr; /* Number of directory entry creation edits */
317 atomic_t n_dir_rm; /* Number of directory entry removal edits */
318 atomic_t n_stores; /* Number of store ops */
319 atomic_long_t n_store_bytes; /* Number of bytes stored */
320 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
321 atomic_t n_fetches; /* Number of data fetch ops */
322 };
323
324 extern const char afs_init_sysname[];
325
326 enum afs_cell_state {
327 AFS_CELL_UNSET,
328 AFS_CELL_ACTIVATING,
329 AFS_CELL_ACTIVE,
330 AFS_CELL_DEACTIVATING,
331 AFS_CELL_INACTIVE,
332 AFS_CELL_FAILED,
333 AFS_CELL_REMOVED,
334 };
335
336 /*
337 * AFS cell record.
338 *
339 * This is a tricky concept to get right as it is possible to create aliases
340 * simply by pointing AFSDB/SRV records for two names at the same set of VL
341 * servers; it is also possible to do things like setting up two sets of VL
342 * servers, one of which provides a superset of the volumes provided by the
343 * other (for internal/external division, for example).
344 *
345 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
346 * servers and (b) a cell's name is used by the client to select the key to use
347 * for authentication and encryption. The cell name is not typically used in
348 * the protocol.
349 *
350 * Two cells are determined to be aliases if they have an explicit alias (YFS
351 * only), share any VL servers in common or have at least one volume in common.
352 * "In common" means that the address list of the VL servers or the fileservers
353 * share at least one endpoint.
354 */
355 struct afs_cell {
356 union {
357 struct rcu_head rcu;
358 struct rb_node net_node; /* Node in net->cells */
359 };
360 struct afs_net *net;
361 struct afs_cell *alias_of; /* The cell this is an alias of */
362 struct afs_volume *root_volume; /* The root.cell volume if there is one */
363 struct key *anonymous_key; /* anonymous user key for this cell */
364 struct work_struct manager; /* Manager for init/deinit/dns */
365 struct hlist_node proc_link; /* /proc cell list link */
366 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
367 time64_t last_inactive; /* Time of last drop of usage count */
368 refcount_t ref; /* Struct refcount */
369 atomic_t active; /* Active usage counter */
370 unsigned long flags;
371 #define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
372 #define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
373 #define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
374 enum afs_cell_state state;
375 short error;
376 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
377 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
378 unsigned int dns_lookup_count; /* Counter of DNS lookups */
379 unsigned int debug_id;
380
381 /* The volumes belonging to this cell */
382 spinlock_t vs_lock; /* Lock for server->volumes */
383 struct rb_root volumes; /* Tree of volumes on this server */
384 struct hlist_head proc_volumes; /* procfs volume list */
385 seqlock_t volume_lock; /* For volumes */
386
387 /* Active fileserver interaction state. */
388 struct rb_root fs_servers; /* afs_server (by server UUID) */
389 seqlock_t fs_lock; /* For fs_servers */
390 struct rw_semaphore fs_open_mmaps_lock;
391 struct list_head fs_open_mmaps; /* List of vnodes that are mmapped */
392 atomic_t fs_s_break; /* Counter of CB.InitCallBackState messages */
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; /* 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 #define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
413 rwlock_t lock; /* Lock on addresses */
414 refcount_t ref;
415 unsigned int rtt; /* Server's current RTT in uS */
416
417 /* Probe state */
418 wait_queue_head_t probe_wq;
419 atomic_t probe_outstanding;
420 spinlock_t probe_lock;
421 struct {
422 unsigned int rtt; /* RTT in uS */
423 u32 abort_code;
424 short error;
425 unsigned short flags;
426 #define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
427 #define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
428 #define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
429 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
430 } probe;
431
432 u16 port;
433 u16 name_len; /* Length of name */
434 char name[]; /* Server name, case-flattened */
435 };
436
437 /*
438 * Weighted list of Volume Location servers.
439 */
440 struct afs_vlserver_entry {
441 u16 priority; /* Preference (as SRV) */
442 u16 weight; /* Weight (as SRV) */
443 enum dns_record_source source:8;
444 enum dns_lookup_status status:8;
445 struct afs_vlserver *server;
446 };
447
448 struct afs_vlserver_list {
449 struct rcu_head rcu;
450 refcount_t ref;
451 u8 nr_servers;
452 u8 index; /* Server currently in use */
453 u8 preferred; /* Preferred server */
454 enum dns_record_source source:8;
455 enum dns_lookup_status status:8;
456 rwlock_t lock;
457 struct afs_vlserver_entry servers[];
458 };
459
460 /*
461 * Cached VLDB entry.
462 *
463 * This is pointed to by cell->vldb_entries, indexed by name.
464 */
465 struct afs_vldb_entry {
466 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
467
468 unsigned long flags;
469 #define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
470 #define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
471 #define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
472 #define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
473 #define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
474
475 uuid_t fs_server[AFS_NMAXNSERVERS];
476 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
477 u8 fs_mask[AFS_NMAXNSERVERS];
478 #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
479 #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
480 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
481 short error;
482 u8 nr_servers; /* Number of server records */
483 u8 name_len;
484 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
485 };
486
487 /*
488 * Record of fileserver with which we're actively communicating.
489 */
490 struct afs_server {
491 struct rcu_head rcu;
492 union {
493 uuid_t uuid; /* Server ID */
494 struct afs_uuid _uuid;
495 };
496
497 struct afs_addr_list __rcu *addresses;
498 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
499 struct rb_node uuid_rb; /* Link in net->fs_servers */
500 struct afs_server __rcu *uuid_next; /* Next server with same UUID */
501 struct afs_server *uuid_prev; /* Previous server with same UUID */
502 struct list_head probe_link; /* Link in net->fs_probe_list */
503 struct hlist_node addr4_link; /* Link in net->fs_addresses4 */
504 struct hlist_node addr6_link; /* Link in net->fs_addresses6 */
505 struct hlist_node proc_link; /* Link in net->fs_proc */
506 struct list_head volumes; /* RCU list of afs_server_entry objects */
507 struct work_struct initcb_work; /* Work for CB.InitCallBackState* */
508 struct afs_server *gc_next; /* Next server in manager's list */
509 time64_t unuse_time; /* Time at which last unused */
510 unsigned long flags;
511 #define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
512 #define AFS_SERVER_FL_UPDATING 1
513 #define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
514 #define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */
515 #define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */
516 #define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */
517 #define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
518 #define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
519 #define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
520 #define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
521 #define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
522 refcount_t ref; /* Object refcount */
523 atomic_t active; /* Active user count */
524 u32 addr_version; /* Address list version */
525 unsigned int rtt; /* Server's current RTT in uS */
526 unsigned int debug_id; /* Debugging ID for traces */
527
528 /* file service access */
529 rwlock_t fs_lock; /* access lock */
530
531 /* callback promise management */
532 unsigned cb_s_break; /* Break-everything counter. */
533
534 /* Probe state */
535 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
536 wait_queue_head_t probe_wq;
537 atomic_t probe_outstanding;
538 spinlock_t probe_lock;
539 struct {
540 unsigned int rtt; /* RTT in uS */
541 u32 abort_code;
542 short error;
543 bool responded:1;
544 bool is_yfs:1;
545 bool not_yfs:1;
546 bool local_failure:1;
547 } probe;
548 };
549
550 /*
551 * Replaceable volume server list.
552 */
553 struct afs_server_entry {
554 struct afs_server *server;
555 struct afs_volume *volume;
556 struct list_head slink; /* Link in server->volumes */
557 };
558
559 struct afs_server_list {
560 struct rcu_head rcu;
561 refcount_t usage;
562 bool attached; /* T if attached to servers */
563 unsigned char nr_servers;
564 unsigned char preferred; /* Preferred server */
565 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
566 unsigned int seq; /* Set to ->servers_seq when installed */
567 rwlock_t lock;
568 struct afs_server_entry servers[];
569 };
570
571 /*
572 * Live AFS volume management.
573 */
574 struct afs_volume {
575 struct rcu_head rcu;
576 afs_volid_t vid; /* The volume ID of this volume */
577 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
578 refcount_t ref;
579 time64_t update_at; /* Time at which to next update */
580 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
581 struct rb_node cell_node; /* Link in cell->volumes */
582 struct hlist_node proc_link; /* Link in cell->proc_volumes */
583 struct super_block __rcu *sb; /* Superblock on which inodes reside */
584 unsigned long flags;
585 #define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
586 #define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
587 #define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
588 #define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
589 #define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */
590 #define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */
591 #define AFS_VOLUME_MAYBE_NO_IBULK 6 /* - T if some servers don't have InlineBulkStatus */
592 #define AFS_VOLUME_RM_TREE 7 /* - Set if volume removed from cell->volumes */
593 #ifdef CONFIG_AFS_FSCACHE
594 struct fscache_volume *cache; /* Caching cookie */
595 #endif
596 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
597 rwlock_t servers_lock; /* Lock for ->servers */
598 unsigned int servers_seq; /* Incremented each time ->servers changes */
599
600 unsigned cb_v_break; /* Break-everything counter. */
601 rwlock_t cb_v_break_lock;
602
603 afs_voltype_t type; /* type of volume */
604 char type_force; /* force volume type (suppress R/O -> R/W) */
605 u8 name_len;
606 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
607 };
608
609 enum afs_lock_state {
610 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
611 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
612 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
613 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
614 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
615 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
616 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
617 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
618 };
619
620 /*
621 * AFS inode private data.
622 *
623 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
624 * leak from one inode to another.
625 */
626 struct afs_vnode {
627 struct netfs_inode netfs; /* Netfslib context and vfs inode */
628 struct afs_volume *volume; /* volume on which vnode resides */
629 struct afs_fid fid; /* the file identifier for this inode */
630 struct afs_file_status status; /* AFS status info for this file */
631 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
632 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
633 struct mutex io_lock; /* Lock for serialising I/O on this mutex */
634 struct rw_semaphore validate_lock; /* lock for validating this vnode */
635 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
636 struct key *silly_key; /* Silly rename key */
637 spinlock_t wb_lock; /* lock for wb_keys */
638 spinlock_t lock; /* waitqueue/flags lock */
639 unsigned long flags;
640 #define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */
641 #define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
642 #define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
643 #define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
644 #define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
645 #define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
646 #define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
647 #define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
648 #define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
649 #define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
650 #define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
651
652 struct list_head wb_keys; /* List of keys available for writeback */
653 struct list_head pending_locks; /* locks waiting to be granted */
654 struct list_head granted_locks; /* locks granted on this file */
655 struct delayed_work lock_work; /* work to be done in locking */
656 struct key *lock_key; /* Key to be used in lock ops */
657 ktime_t locked_at; /* Time at which lock obtained */
658 enum afs_lock_state lock_state : 8;
659 afs_lock_type_t lock_type : 8;
660
661 /* outstanding callback notification on this file */
662 struct work_struct cb_work; /* Work for mmap'd files */
663 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
664 void *cb_server; /* Server with callback/filelock */
665 atomic_t cb_nr_mmap; /* Number of mmaps */
666 unsigned int cb_fs_s_break; /* Mass server break counter (cell->fs_s_break) */
667 unsigned int cb_s_break; /* Mass break counter on ->server */
668 unsigned int cb_v_break; /* Mass break counter on ->volume */
669 unsigned int cb_break; /* Break counter on vnode */
670 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
671
672 time64_t cb_expires_at; /* time at which callback expires */
673 };
674
afs_vnode_cache(struct afs_vnode * vnode)675 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
676 {
677 #ifdef CONFIG_AFS_FSCACHE
678 return netfs_i_cookie(&vnode->netfs);
679 #else
680 return NULL;
681 #endif
682 }
683
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)684 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
685 struct fscache_cookie *cookie)
686 {
687 #ifdef CONFIG_AFS_FSCACHE
688 vnode->netfs.cache = cookie;
689 if (cookie)
690 mapping_set_release_always(vnode->netfs.inode.i_mapping);
691 #endif
692 }
693
694 /*
695 * cached security record for one user's attempt to access a vnode
696 */
697 struct afs_permit {
698 struct key *key; /* RxRPC ticket holding a security context */
699 afs_access_t access; /* CallerAccess value for this key */
700 };
701
702 /*
703 * Immutable cache of CallerAccess records from attempts to access vnodes.
704 * These may be shared between multiple vnodes.
705 */
706 struct afs_permits {
707 struct rcu_head rcu;
708 struct hlist_node hash_node; /* Link in hash */
709 unsigned long h; /* Hash value for this permit list */
710 refcount_t usage;
711 unsigned short nr_permits; /* Number of records */
712 bool invalidated; /* Invalidated due to key change */
713 struct afs_permit permits[]; /* List of permits sorted by key pointer */
714 };
715
716 /*
717 * Error prioritisation and accumulation.
718 */
719 struct afs_error {
720 short error; /* Accumulated error */
721 bool responded; /* T if server responded */
722 };
723
724 /*
725 * Cursor for iterating over a server's address list.
726 */
727 struct afs_addr_cursor {
728 struct afs_addr_list *alist; /* Current address list (pins ref) */
729 unsigned long tried; /* Tried addresses */
730 signed char index; /* Current address */
731 bool responded; /* T if the current address responded */
732 unsigned short nr_iterations; /* Number of address iterations */
733 short error;
734 u32 abort_code;
735 };
736
737 /*
738 * Cursor for iterating over a set of volume location servers.
739 */
740 struct afs_vl_cursor {
741 struct afs_addr_cursor ac;
742 struct afs_cell *cell; /* The cell we're querying */
743 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
744 struct afs_vlserver *server; /* Server on which this resides */
745 struct key *key; /* Key for the server */
746 unsigned long untried; /* Bitmask of untried servers */
747 short index; /* Current server */
748 short error;
749 unsigned short flags;
750 #define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
751 #define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
752 #define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
753 unsigned short nr_iterations; /* Number of server iterations */
754 };
755
756 /*
757 * Fileserver operation methods.
758 */
759 struct afs_operation_ops {
760 void (*issue_afs_rpc)(struct afs_operation *op);
761 void (*issue_yfs_rpc)(struct afs_operation *op);
762 void (*success)(struct afs_operation *op);
763 void (*aborted)(struct afs_operation *op);
764 void (*failed)(struct afs_operation *op);
765 void (*edit_dir)(struct afs_operation *op);
766 void (*put)(struct afs_operation *op);
767 };
768
769 struct afs_vnode_param {
770 struct afs_vnode *vnode;
771 struct afs_fid fid; /* Fid to access */
772 struct afs_status_cb scb; /* Returned status and callback promise */
773 afs_dataversion_t dv_before; /* Data version before the call */
774 unsigned int cb_break_before; /* cb_break + cb_s_break before the call */
775 u8 dv_delta; /* Expected change in data version */
776 bool put_vnode:1; /* T if we have a ref on the vnode */
777 bool need_io_lock:1; /* T if we need the I/O lock on this */
778 bool update_ctime:1; /* Need to update the ctime */
779 bool set_size:1; /* Must update i_size */
780 bool op_unlinked:1; /* True if file was unlinked by op */
781 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
782 bool modification:1; /* Set if the content gets modified */
783 };
784
785 /*
786 * Fileserver operation wrapper, handling server and address rotation
787 * asynchronously. May make simultaneous calls to multiple servers.
788 */
789 struct afs_operation {
790 struct afs_net *net; /* Network namespace */
791 struct key *key; /* Key for the cell */
792 const struct afs_call_type *type; /* Type of call done */
793 const struct afs_operation_ops *ops;
794
795 /* Parameters/results for the operation */
796 struct afs_volume *volume; /* Volume being accessed */
797 struct afs_vnode_param file[2];
798 struct afs_vnode_param *more_files;
799 struct afs_volsync volsync;
800 struct dentry *dentry; /* Dentry to be altered */
801 struct dentry *dentry_2; /* Second dentry to be altered */
802 struct timespec64 mtime; /* Modification time to record */
803 struct timespec64 ctime; /* Change time to set */
804 short nr_files; /* Number of entries in file[], more_files */
805 short error;
806 unsigned int debug_id;
807
808 unsigned int cb_v_break; /* Volume break counter before op */
809 unsigned int cb_s_break; /* Server break counter before op */
810
811 union {
812 struct {
813 int which; /* Which ->file[] to fetch for */
814 } fetch_status;
815 struct {
816 int reason; /* enum afs_edit_dir_reason */
817 mode_t mode;
818 const char *symlink;
819 } create;
820 struct {
821 bool need_rehash;
822 } unlink;
823 struct {
824 struct dentry *rehash;
825 struct dentry *tmp;
826 bool new_negative;
827 } rename;
828 struct {
829 struct afs_read *req;
830 } fetch;
831 struct {
832 afs_lock_type_t type;
833 } lock;
834 struct {
835 struct iov_iter *write_iter;
836 loff_t pos;
837 loff_t size;
838 loff_t i_size;
839 bool laundering; /* Laundering page, PG_writeback not set */
840 } store;
841 struct {
842 struct iattr *attr;
843 loff_t old_i_size;
844 } setattr;
845 struct afs_acl *acl;
846 struct yfs_acl *yacl;
847 struct {
848 struct afs_volume_status vs;
849 struct kstatfs *buf;
850 } volstatus;
851 };
852
853 /* Fileserver iteration state */
854 struct afs_addr_cursor ac;
855 struct afs_server_list *server_list; /* Current server list (pins ref) */
856 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
857 struct afs_call *call;
858 unsigned long untried; /* Bitmask of untried servers */
859 short index; /* Current server */
860 unsigned short nr_iterations; /* Number of server iterations */
861
862 unsigned int flags;
863 #define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
864 #define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
865 #define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
866 #define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
867 #define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
868 #define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
869 #define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
870 #define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
871 #define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
872 #define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
873 #define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
874 #define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
875 #define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
876 };
877
878 /*
879 * Cache auxiliary data.
880 */
881 struct afs_vnode_cache_aux {
882 __be64 data_version;
883 } __packed;
884
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)885 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
886 struct afs_vnode_cache_aux *aux)
887 {
888 aux->data_version = cpu_to_be64(vnode->status.data_version);
889 }
890
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)891 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
892 {
893 struct afs_vnode_cache_aux aux;
894
895 afs_set_cache_aux(vnode, &aux);
896 fscache_invalidate(afs_vnode_cache(vnode), &aux,
897 i_size_read(&vnode->netfs.inode), flags);
898 }
899
900 /*
901 * We use folio->private to hold the amount of the folio that we've written to,
902 * splitting the field into two parts. However, we need to represent a range
903 * 0...FOLIO_SIZE, so we reduce the resolution if the size of the folio
904 * exceeds what we can encode.
905 */
906 #ifdef CONFIG_64BIT
907 #define __AFS_FOLIO_PRIV_MASK 0x7fffffffUL
908 #define __AFS_FOLIO_PRIV_SHIFT 32
909 #define __AFS_FOLIO_PRIV_MMAPPED 0x80000000UL
910 #else
911 #define __AFS_FOLIO_PRIV_MASK 0x7fffUL
912 #define __AFS_FOLIO_PRIV_SHIFT 16
913 #define __AFS_FOLIO_PRIV_MMAPPED 0x8000UL
914 #endif
915
afs_folio_dirty_resolution(struct folio * folio)916 static inline unsigned int afs_folio_dirty_resolution(struct folio *folio)
917 {
918 int shift = folio_shift(folio) - (__AFS_FOLIO_PRIV_SHIFT - 1);
919 return (shift > 0) ? shift : 0;
920 }
921
afs_folio_dirty_from(struct folio * folio,unsigned long priv)922 static inline size_t afs_folio_dirty_from(struct folio *folio, unsigned long priv)
923 {
924 unsigned long x = priv & __AFS_FOLIO_PRIV_MASK;
925
926 /* The lower bound is inclusive */
927 return x << afs_folio_dirty_resolution(folio);
928 }
929
afs_folio_dirty_to(struct folio * folio,unsigned long priv)930 static inline size_t afs_folio_dirty_to(struct folio *folio, unsigned long priv)
931 {
932 unsigned long x = (priv >> __AFS_FOLIO_PRIV_SHIFT) & __AFS_FOLIO_PRIV_MASK;
933
934 /* The upper bound is immediately beyond the region */
935 return (x + 1) << afs_folio_dirty_resolution(folio);
936 }
937
afs_folio_dirty(struct folio * folio,size_t from,size_t to)938 static inline unsigned long afs_folio_dirty(struct folio *folio, size_t from, size_t to)
939 {
940 unsigned int res = afs_folio_dirty_resolution(folio);
941 from >>= res;
942 to = (to - 1) >> res;
943 return (to << __AFS_FOLIO_PRIV_SHIFT) | from;
944 }
945
afs_folio_dirty_mmapped(unsigned long priv)946 static inline unsigned long afs_folio_dirty_mmapped(unsigned long priv)
947 {
948 return priv | __AFS_FOLIO_PRIV_MMAPPED;
949 }
950
afs_is_folio_dirty_mmapped(unsigned long priv)951 static inline bool afs_is_folio_dirty_mmapped(unsigned long priv)
952 {
953 return priv & __AFS_FOLIO_PRIV_MMAPPED;
954 }
955
956 #include <trace/events/afs.h>
957
958 /*****************************************************************************/
959 /*
960 * addr_list.c
961 */
afs_get_addrlist(struct afs_addr_list * alist)962 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
963 {
964 if (alist)
965 refcount_inc(&alist->usage);
966 return alist;
967 }
968 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
969 unsigned short,
970 unsigned short);
971 extern void afs_put_addrlist(struct afs_addr_list *);
972 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
973 const char *, size_t, char,
974 unsigned short, unsigned short);
975 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
976 extern bool afs_iterate_addresses(struct afs_addr_cursor *);
977 extern int afs_end_cursor(struct afs_addr_cursor *);
978
979 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
980 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
981
982 /*
983 * callback.c
984 */
985 extern void afs_invalidate_mmap_work(struct work_struct *);
986 extern void afs_server_init_callback_work(struct work_struct *work);
987 extern void afs_init_callback_state(struct afs_server *);
988 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
989 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
990 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
991
afs_calc_vnode_cb_break(struct afs_vnode * vnode)992 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
993 {
994 return vnode->cb_break + vnode->cb_v_break;
995 }
996
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)997 static inline bool afs_cb_is_broken(unsigned int cb_break,
998 const struct afs_vnode *vnode)
999 {
1000 return cb_break != (vnode->cb_break + vnode->volume->cb_v_break);
1001 }
1002
1003 /*
1004 * cell.c
1005 */
1006 extern int afs_cell_init(struct afs_net *, const char *);
1007 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1008 enum afs_cell_trace);
1009 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1010 const char *, bool);
1011 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1012 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1013 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1014 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1015 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1016 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1017 extern void afs_manage_cells(struct work_struct *);
1018 extern void afs_cells_timer(struct timer_list *);
1019 extern void __net_exit afs_cell_purge(struct afs_net *);
1020
1021 /*
1022 * cmservice.c
1023 */
1024 extern bool afs_cm_incoming_call(struct afs_call *);
1025
1026 /*
1027 * dir.c
1028 */
1029 extern const struct file_operations afs_dir_file_operations;
1030 extern const struct inode_operations afs_dir_inode_operations;
1031 extern const struct address_space_operations afs_dir_aops;
1032 extern const struct dentry_operations afs_fs_dentry_operations;
1033
1034 extern void afs_d_release(struct dentry *);
1035 extern void afs_check_for_remote_deletion(struct afs_operation *);
1036
1037 /*
1038 * dir_edit.c
1039 */
1040 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1041 enum afs_edit_dir_reason);
1042 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1043 void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
1044 enum afs_edit_dir_reason why);
1045
1046 /*
1047 * dir_silly.c
1048 */
1049 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1050 struct dentry *, struct key *);
1051 extern int afs_silly_iput(struct dentry *, struct inode *);
1052
1053 /*
1054 * dynroot.c
1055 */
1056 extern const struct inode_operations afs_dynroot_inode_operations;
1057 extern const struct dentry_operations afs_dynroot_dentry_operations;
1058
1059 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1060 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1061 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1062 extern int afs_dynroot_populate(struct super_block *);
1063 extern void afs_dynroot_depopulate(struct super_block *);
1064
1065 /*
1066 * file.c
1067 */
1068 extern const struct address_space_operations afs_file_aops;
1069 extern const struct address_space_operations afs_symlink_aops;
1070 extern const struct inode_operations afs_file_inode_operations;
1071 extern const struct file_operations afs_file_operations;
1072 extern const struct netfs_request_ops afs_req_ops;
1073
1074 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1075 extern void afs_put_wb_key(struct afs_wb_key *);
1076 extern int afs_open(struct inode *, struct file *);
1077 extern int afs_release(struct inode *, struct file *);
1078 extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
1079 extern struct afs_read *afs_alloc_read(gfp_t);
1080 extern void afs_put_read(struct afs_read *);
1081 extern int afs_write_inode(struct inode *, struct writeback_control *);
1082
afs_get_read(struct afs_read * req)1083 static inline struct afs_read *afs_get_read(struct afs_read *req)
1084 {
1085 refcount_inc(&req->usage);
1086 return req;
1087 }
1088
1089 /*
1090 * flock.c
1091 */
1092 extern struct workqueue_struct *afs_lock_manager;
1093
1094 extern void afs_lock_op_done(struct afs_call *);
1095 extern void afs_lock_work(struct work_struct *);
1096 extern void afs_lock_may_be_available(struct afs_vnode *);
1097 extern int afs_lock(struct file *, int, struct file_lock *);
1098 extern int afs_flock(struct file *, int, struct file_lock *);
1099
1100 /*
1101 * fsclient.c
1102 */
1103 extern void afs_fs_fetch_status(struct afs_operation *);
1104 extern void afs_fs_fetch_data(struct afs_operation *);
1105 extern void afs_fs_create_file(struct afs_operation *);
1106 extern void afs_fs_make_dir(struct afs_operation *);
1107 extern void afs_fs_remove_file(struct afs_operation *);
1108 extern void afs_fs_remove_dir(struct afs_operation *);
1109 extern void afs_fs_link(struct afs_operation *);
1110 extern void afs_fs_symlink(struct afs_operation *);
1111 extern void afs_fs_rename(struct afs_operation *);
1112 extern void afs_fs_store_data(struct afs_operation *);
1113 extern void afs_fs_setattr(struct afs_operation *);
1114 extern void afs_fs_get_volume_status(struct afs_operation *);
1115 extern void afs_fs_set_lock(struct afs_operation *);
1116 extern void afs_fs_extend_lock(struct afs_operation *);
1117 extern void afs_fs_release_lock(struct afs_operation *);
1118 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
1119 struct afs_addr_cursor *, struct key *);
1120 extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
1121 struct afs_addr_cursor *, struct key *);
1122 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1123
1124 struct afs_acl {
1125 u32 size;
1126 u8 data[];
1127 };
1128
1129 extern void afs_fs_fetch_acl(struct afs_operation *);
1130 extern void afs_fs_store_acl(struct afs_operation *);
1131
1132 /*
1133 * fs_operation.c
1134 */
1135 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1136 extern int afs_put_operation(struct afs_operation *);
1137 extern bool afs_begin_vnode_operation(struct afs_operation *);
1138 extern void afs_wait_for_operation(struct afs_operation *);
1139 extern int afs_do_sync_operation(struct afs_operation *);
1140
afs_op_nomem(struct afs_operation * op)1141 static inline void afs_op_nomem(struct afs_operation *op)
1142 {
1143 op->error = -ENOMEM;
1144 }
1145
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1146 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1147 struct afs_vnode *vnode)
1148 {
1149 op->file[n].vnode = vnode;
1150 op->file[n].need_io_lock = true;
1151 }
1152
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1153 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1154 const struct afs_fid *fid)
1155 {
1156 op->file[n].fid = *fid;
1157 }
1158
1159 /*
1160 * fs_probe.c
1161 */
1162 extern void afs_fileserver_probe_result(struct afs_call *);
1163 extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool);
1164 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
1165 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1166 extern void afs_fs_probe_dispatcher(struct work_struct *);
1167 extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
1168 extern void afs_fs_probe_cleanup(struct afs_net *);
1169
1170 /*
1171 * inode.c
1172 */
1173 extern const struct afs_operation_ops afs_fetch_status_operation;
1174
1175 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1176 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1177 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1178 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1179 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1180 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1181 extern bool afs_check_validity(struct afs_vnode *);
1182 extern int afs_validate(struct afs_vnode *, struct key *);
1183 bool afs_pagecache_valid(struct afs_vnode *);
1184 extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
1185 struct kstat *, u32, unsigned int);
1186 extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1187 extern void afs_evict_inode(struct inode *);
1188 extern int afs_drop_inode(struct inode *);
1189
1190 /*
1191 * main.c
1192 */
1193 extern struct workqueue_struct *afs_wq;
1194 extern int afs_net_id;
1195
afs_net(struct net * net)1196 static inline struct afs_net *afs_net(struct net *net)
1197 {
1198 return net_generic(net, afs_net_id);
1199 }
1200
afs_sb2net(struct super_block * sb)1201 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1202 {
1203 return afs_net(AFS_FS_S(sb)->net_ns);
1204 }
1205
afs_d2net(struct dentry * dentry)1206 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1207 {
1208 return afs_sb2net(dentry->d_sb);
1209 }
1210
afs_i2net(struct inode * inode)1211 static inline struct afs_net *afs_i2net(struct inode *inode)
1212 {
1213 return afs_sb2net(inode->i_sb);
1214 }
1215
afs_v2net(struct afs_vnode * vnode)1216 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1217 {
1218 return afs_i2net(&vnode->netfs.inode);
1219 }
1220
afs_sock2net(struct sock * sk)1221 static inline struct afs_net *afs_sock2net(struct sock *sk)
1222 {
1223 return net_generic(sock_net(sk), afs_net_id);
1224 }
1225
__afs_stat(atomic_t * s)1226 static inline void __afs_stat(atomic_t *s)
1227 {
1228 atomic_inc(s);
1229 }
1230
1231 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1232
1233 /*
1234 * misc.c
1235 */
1236 extern int afs_abort_to_error(u32);
1237 extern void afs_prioritise_error(struct afs_error *, int, u32);
1238
1239 /*
1240 * mntpt.c
1241 */
1242 extern const struct inode_operations afs_mntpt_inode_operations;
1243 extern const struct inode_operations afs_autocell_inode_operations;
1244 extern const struct file_operations afs_mntpt_file_operations;
1245
1246 extern struct vfsmount *afs_d_automount(struct path *);
1247 extern void afs_mntpt_kill_timer(void);
1248
1249 /*
1250 * proc.c
1251 */
1252 #ifdef CONFIG_PROC_FS
1253 extern int __net_init afs_proc_init(struct afs_net *);
1254 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1255 extern int afs_proc_cell_setup(struct afs_cell *);
1256 extern void afs_proc_cell_remove(struct afs_cell *);
1257 extern void afs_put_sysnames(struct afs_sysnames *);
1258 #else
afs_proc_init(struct afs_net * net)1259 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1260 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1261 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1262 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1263 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1264 #endif
1265
1266 /*
1267 * rotate.c
1268 */
1269 extern bool afs_select_fileserver(struct afs_operation *);
1270 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1271
1272 /*
1273 * rxrpc.c
1274 */
1275 extern struct workqueue_struct *afs_async_calls;
1276
1277 extern int __net_init afs_open_socket(struct afs_net *);
1278 extern void __net_exit afs_close_socket(struct afs_net *);
1279 extern void afs_charge_preallocation(struct work_struct *);
1280 extern void afs_put_call(struct afs_call *);
1281 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
1282 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
1283 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1284 const struct afs_call_type *,
1285 size_t, size_t);
1286 extern void afs_flat_call_destructor(struct afs_call *);
1287 extern void afs_send_empty_reply(struct afs_call *);
1288 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1289 extern int afs_extract_data(struct afs_call *, bool);
1290 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1291
afs_see_call(struct afs_call * call,enum afs_call_trace why)1292 static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why)
1293 {
1294 int r = refcount_read(&call->ref);
1295
1296 trace_afs_call(call->debug_id, why, r,
1297 atomic_read(&call->net->nr_outstanding_calls),
1298 __builtin_return_address(0));
1299 }
1300
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1301 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1302 gfp_t gfp)
1303 {
1304 op->call = call;
1305 op->type = call->type;
1306 call->op = op;
1307 call->key = op->key;
1308 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1309 afs_make_call(&op->ac, call, gfp);
1310 }
1311
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1312 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1313 {
1314 call->iov_len = size;
1315 call->kvec[0].iov_base = buf;
1316 call->kvec[0].iov_len = size;
1317 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1318 }
1319
afs_extract_to_tmp(struct afs_call * call)1320 static inline void afs_extract_to_tmp(struct afs_call *call)
1321 {
1322 call->iov_len = sizeof(call->tmp);
1323 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1324 }
1325
afs_extract_to_tmp64(struct afs_call * call)1326 static inline void afs_extract_to_tmp64(struct afs_call *call)
1327 {
1328 call->iov_len = sizeof(call->tmp64);
1329 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1330 }
1331
afs_extract_discard(struct afs_call * call,size_t size)1332 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1333 {
1334 call->iov_len = size;
1335 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1336 }
1337
afs_extract_to_buf(struct afs_call * call,size_t size)1338 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1339 {
1340 call->iov_len = size;
1341 afs_extract_begin(call, call->buffer, size);
1342 }
1343
afs_transfer_reply(struct afs_call * call)1344 static inline int afs_transfer_reply(struct afs_call *call)
1345 {
1346 return afs_extract_data(call, false);
1347 }
1348
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1349 static inline bool afs_check_call_state(struct afs_call *call,
1350 enum afs_call_state state)
1351 {
1352 return READ_ONCE(call->state) == state;
1353 }
1354
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1355 static inline bool afs_set_call_state(struct afs_call *call,
1356 enum afs_call_state from,
1357 enum afs_call_state to)
1358 {
1359 bool ok = false;
1360
1361 spin_lock_bh(&call->state_lock);
1362 if (call->state == from) {
1363 call->state = to;
1364 trace_afs_call_state(call, from, to, 0, 0);
1365 ok = true;
1366 }
1367 spin_unlock_bh(&call->state_lock);
1368 return ok;
1369 }
1370
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1371 static inline void afs_set_call_complete(struct afs_call *call,
1372 int error, u32 remote_abort)
1373 {
1374 enum afs_call_state state;
1375 bool ok = false;
1376
1377 spin_lock_bh(&call->state_lock);
1378 state = call->state;
1379 if (state != AFS_CALL_COMPLETE) {
1380 call->abort_code = remote_abort;
1381 call->error = error;
1382 call->state = AFS_CALL_COMPLETE;
1383 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1384 error, remote_abort);
1385 ok = true;
1386 }
1387 spin_unlock_bh(&call->state_lock);
1388 if (ok) {
1389 trace_afs_call_done(call);
1390
1391 /* Asynchronous calls have two refs to release - one from the alloc and
1392 * one queued with the work item - and we can't just deallocate the
1393 * call because the work item may be queued again.
1394 */
1395 if (call->drop_ref)
1396 afs_put_call(call);
1397 }
1398 }
1399
1400 /*
1401 * security.c
1402 */
1403 extern void afs_put_permits(struct afs_permits *);
1404 extern void afs_clear_permits(struct afs_vnode *);
1405 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1406 struct afs_status_cb *);
1407 extern struct key *afs_request_key(struct afs_cell *);
1408 extern struct key *afs_request_key_rcu(struct afs_cell *);
1409 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1410 extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1411 extern void __exit afs_clean_up_permit_cache(void);
1412
1413 /*
1414 * server.c
1415 */
1416 extern spinlock_t afs_server_peer_lock;
1417
1418 extern struct afs_server *afs_find_server(struct afs_net *,
1419 const struct sockaddr_rxrpc *);
1420 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1421 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1422 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1423 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1424 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1425 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1426 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1427 extern void afs_manage_servers(struct work_struct *);
1428 extern void afs_servers_timer(struct timer_list *);
1429 extern void afs_fs_probe_timer(struct timer_list *);
1430 extern void __net_exit afs_purge_servers(struct afs_net *);
1431 extern bool afs_check_server_record(struct afs_operation *, struct afs_server *);
1432
afs_inc_servers_outstanding(struct afs_net * net)1433 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1434 {
1435 atomic_inc(&net->servers_outstanding);
1436 }
1437
afs_dec_servers_outstanding(struct afs_net * net)1438 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1439 {
1440 if (atomic_dec_and_test(&net->servers_outstanding))
1441 wake_up_var(&net->servers_outstanding);
1442 }
1443
afs_is_probing_server(struct afs_server * server)1444 static inline bool afs_is_probing_server(struct afs_server *server)
1445 {
1446 return list_empty(&server->probe_link);
1447 }
1448
1449 /*
1450 * server_list.c
1451 */
afs_get_serverlist(struct afs_server_list * slist)1452 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1453 {
1454 refcount_inc(&slist->usage);
1455 return slist;
1456 }
1457
1458 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1459 struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1460 struct key *key,
1461 struct afs_vldb_entry *vldb);
1462 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1463 void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1464 void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1465 struct afs_server_list *old);
1466 void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1467
1468 /*
1469 * super.c
1470 */
1471 extern int __init afs_fs_init(void);
1472 extern void afs_fs_exit(void);
1473
1474 /*
1475 * vlclient.c
1476 */
1477 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1478 const char *, int);
1479 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1480 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
1481 struct key *, struct afs_vlserver *, unsigned int);
1482 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1483 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1484
1485 /*
1486 * vl_alias.c
1487 */
1488 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1489
1490 /*
1491 * vl_probe.c
1492 */
1493 extern void afs_vlserver_probe_result(struct afs_call *);
1494 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1495 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1496
1497 /*
1498 * vl_rotate.c
1499 */
1500 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1501 struct afs_cell *, struct key *);
1502 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1503 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1504 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1505
1506 /*
1507 * vlserver_list.c
1508 */
afs_get_vlserver(struct afs_vlserver * vlserver)1509 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1510 {
1511 refcount_inc(&vlserver->ref);
1512 return vlserver;
1513 }
1514
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1515 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1516 {
1517 if (vllist)
1518 refcount_inc(&vllist->ref);
1519 return vllist;
1520 }
1521
1522 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1523 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1524 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1525 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1526 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1527 const void *, size_t);
1528
1529 /*
1530 * volume.c
1531 */
1532 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1533 extern int afs_activate_volume(struct afs_volume *);
1534 extern void afs_deactivate_volume(struct afs_volume *);
1535 bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1536 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1537 extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
1538 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1539
1540 /*
1541 * write.c
1542 */
1543 #ifdef CONFIG_AFS_FSCACHE
1544 bool afs_dirty_folio(struct address_space *, struct folio *);
1545 #else
1546 #define afs_dirty_folio filemap_dirty_folio
1547 #endif
1548 extern int afs_write_begin(struct file *file, struct address_space *mapping,
1549 loff_t pos, unsigned len,
1550 struct page **pagep, void **fsdata);
1551 extern int afs_write_end(struct file *file, struct address_space *mapping,
1552 loff_t pos, unsigned len, unsigned copied,
1553 struct page *page, void *fsdata);
1554 extern int afs_writepage(struct page *, struct writeback_control *);
1555 extern int afs_writepages(struct address_space *, struct writeback_control *);
1556 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
1557 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1558 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1559 extern void afs_prune_wb_keys(struct afs_vnode *);
1560 int afs_launder_folio(struct folio *);
1561
1562 /*
1563 * xattr.c
1564 */
1565 extern const struct xattr_handler *afs_xattr_handlers[];
1566
1567 /*
1568 * yfsclient.c
1569 */
1570 extern void yfs_fs_fetch_data(struct afs_operation *);
1571 extern void yfs_fs_create_file(struct afs_operation *);
1572 extern void yfs_fs_make_dir(struct afs_operation *);
1573 extern void yfs_fs_remove_file2(struct afs_operation *);
1574 extern void yfs_fs_remove_file(struct afs_operation *);
1575 extern void yfs_fs_remove_dir(struct afs_operation *);
1576 extern void yfs_fs_link(struct afs_operation *);
1577 extern void yfs_fs_symlink(struct afs_operation *);
1578 extern void yfs_fs_rename(struct afs_operation *);
1579 extern void yfs_fs_store_data(struct afs_operation *);
1580 extern void yfs_fs_setattr(struct afs_operation *);
1581 extern void yfs_fs_get_volume_status(struct afs_operation *);
1582 extern void yfs_fs_set_lock(struct afs_operation *);
1583 extern void yfs_fs_extend_lock(struct afs_operation *);
1584 extern void yfs_fs_release_lock(struct afs_operation *);
1585 extern void yfs_fs_fetch_status(struct afs_operation *);
1586 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1587
1588 struct yfs_acl {
1589 struct afs_acl *acl; /* Dir/file/symlink ACL */
1590 struct afs_acl *vol_acl; /* Whole volume ACL */
1591 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1592 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1593 unsigned int flags;
1594 #define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1595 #define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1596 };
1597
1598 extern void yfs_free_opaque_acl(struct yfs_acl *);
1599 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1600 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1601
1602 /*
1603 * Miscellaneous inline functions.
1604 */
AFS_FS_I(struct inode * inode)1605 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1606 {
1607 return container_of(inode, struct afs_vnode, netfs.inode);
1608 }
1609
AFS_VNODE_TO_I(struct afs_vnode * vnode)1610 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1611 {
1612 return &vnode->netfs.inode;
1613 }
1614
1615 /*
1616 * Note that a dentry got changed. We need to set d_fsdata to the data version
1617 * number derived from the result of the operation. It doesn't matter if
1618 * d_fsdata goes backwards as we'll just revalidate.
1619 */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1620 static inline void afs_update_dentry_version(struct afs_operation *op,
1621 struct afs_vnode_param *dir_vp,
1622 struct dentry *dentry)
1623 {
1624 if (!op->error)
1625 dentry->d_fsdata =
1626 (void *)(unsigned long)dir_vp->scb.status.data_version;
1627 }
1628
1629 /*
1630 * Set the file size and block count. Estimate the number of 512 bytes blocks
1631 * used, rounded up to nearest 1K for consistency with other AFS clients.
1632 */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1633 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1634 {
1635 i_size_write(&vnode->netfs.inode, size);
1636 vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1637 }
1638
1639 /*
1640 * Check for a conflicting operation on a directory that we just unlinked from.
1641 * If someone managed to sneak a link or an unlink in on the file we just
1642 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1643 */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1644 static inline void afs_check_dir_conflict(struct afs_operation *op,
1645 struct afs_vnode_param *dvp)
1646 {
1647 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1648 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1649 }
1650
afs_io_error(struct afs_call * call,enum afs_io_error where)1651 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1652 {
1653 trace_afs_io_error(call->debug_id, -EIO, where);
1654 return -EIO;
1655 }
1656
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1657 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1658 {
1659 trace_afs_file_error(vnode, -EIO, where);
1660 return -EIO;
1661 }
1662
1663 /*****************************************************************************/
1664 /*
1665 * debug tracing
1666 */
1667 extern unsigned afs_debug;
1668
1669 #define dbgprintk(FMT,...) \
1670 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1671
1672 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1673 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1674 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1675
1676
1677 #if defined(__KDEBUG)
1678 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1679 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1680 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1681
1682 #elif defined(CONFIG_AFS_DEBUG)
1683 #define AFS_DEBUG_KENTER 0x01
1684 #define AFS_DEBUG_KLEAVE 0x02
1685 #define AFS_DEBUG_KDEBUG 0x04
1686
1687 #define _enter(FMT,...) \
1688 do { \
1689 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1690 kenter(FMT,##__VA_ARGS__); \
1691 } while (0)
1692
1693 #define _leave(FMT,...) \
1694 do { \
1695 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1696 kleave(FMT,##__VA_ARGS__); \
1697 } while (0)
1698
1699 #define _debug(FMT,...) \
1700 do { \
1701 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1702 kdebug(FMT,##__VA_ARGS__); \
1703 } while (0)
1704
1705 #else
1706 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1707 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1708 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1709 #endif
1710
1711 /*
1712 * debug assertion checking
1713 */
1714 #if 1 // defined(__KDEBUGALL)
1715
1716 #define ASSERT(X) \
1717 do { \
1718 if (unlikely(!(X))) { \
1719 printk(KERN_ERR "\n"); \
1720 printk(KERN_ERR "AFS: Assertion failed\n"); \
1721 BUG(); \
1722 } \
1723 } while(0)
1724
1725 #define ASSERTCMP(X, OP, Y) \
1726 do { \
1727 if (unlikely(!((X) OP (Y)))) { \
1728 printk(KERN_ERR "\n"); \
1729 printk(KERN_ERR "AFS: Assertion failed\n"); \
1730 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1731 (unsigned long)(X), (unsigned long)(Y)); \
1732 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1733 (unsigned long)(X), (unsigned long)(Y)); \
1734 BUG(); \
1735 } \
1736 } while(0)
1737
1738 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1739 do { \
1740 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1741 printk(KERN_ERR "\n"); \
1742 printk(KERN_ERR "AFS: Assertion failed\n"); \
1743 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1744 (unsigned long)(L), (unsigned long)(N), \
1745 (unsigned long)(H)); \
1746 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1747 (unsigned long)(L), (unsigned long)(N), \
1748 (unsigned long)(H)); \
1749 BUG(); \
1750 } \
1751 } while(0)
1752
1753 #define ASSERTIF(C, X) \
1754 do { \
1755 if (unlikely((C) && !(X))) { \
1756 printk(KERN_ERR "\n"); \
1757 printk(KERN_ERR "AFS: Assertion failed\n"); \
1758 BUG(); \
1759 } \
1760 } while(0)
1761
1762 #define ASSERTIFCMP(C, X, OP, Y) \
1763 do { \
1764 if (unlikely((C) && !((X) OP (Y)))) { \
1765 printk(KERN_ERR "\n"); \
1766 printk(KERN_ERR "AFS: Assertion failed\n"); \
1767 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1768 (unsigned long)(X), (unsigned long)(Y)); \
1769 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1770 (unsigned long)(X), (unsigned long)(Y)); \
1771 BUG(); \
1772 } \
1773 } while(0)
1774
1775 #else
1776
1777 #define ASSERT(X) \
1778 do { \
1779 } while(0)
1780
1781 #define ASSERTCMP(X, OP, Y) \
1782 do { \
1783 } while(0)
1784
1785 #define ASSERTRANGE(L, OP1, N, OP2, H) \
1786 do { \
1787 } while(0)
1788
1789 #define ASSERTIF(C, X) \
1790 do { \
1791 } while(0)
1792
1793 #define ASSERTIFCMP(C, X, OP, Y) \
1794 do { \
1795 } while(0)
1796
1797 #endif /* __KDEBUGALL */
1798