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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 ([email protected])
6 */
7
8#include <linux/compiler.h>
9#include <linux/kernel.h>
10#include <linux/ktime.h>
11#include <linux/fs.h>
12#include <linux/filelock.h>
13#include <linux/pagemap.h>
14#include <linux/rxrpc.h>
15#include <linux/key.h>
16#include <linux/workqueue.h>
17#include <linux/sched.h>
18#include <linux/fscache.h>
19#include <linux/backing-dev.h>
20#include <linux/uuid.h>
21#include <linux/mm_types.h>
22#include <linux/dns_resolver.h>
23#include <crypto/krb5.h>
24#include <net/net_namespace.h>
25#include <net/netns/generic.h>
26#include <net/sock.h>
27#include <net/af_rxrpc.h>
28
29#include "afs.h"
30#include "afs_vl.h"
31
32#define AFS_CELL_MAX_ADDRS 15
33
34struct afs_call;
35struct afs_vnode;
36struct 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 */
42enum 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
50struct 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
65enum 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 */
79struct 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
89struct 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
98struct 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 */
107struct 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 */
128struct afs_call {
129 const struct afs_call_type *type; /* type of call */
130 wait_queue_head_t waitq; /* processes awaiting completion */
131 struct work_struct async_work; /* async I/O processor */
132 struct work_struct work; /* actual work processor */
133 struct work_struct free_work; /* Deferred free processor */
134 struct rxrpc_call *rxcall; /* RxRPC call handle */
135 struct rxrpc_peer *peer; /* Remote endpoint */
136 struct key *key; /* security for this call */
137 struct afs_net *net; /* The network namespace */
138 struct afs_server *server; /* The fileserver record if fs op (pins ref) */
139 struct afs_vlserver *vlserver; /* The vlserver record if vl op */
140 void *request; /* request data (first part) */
141 size_t iov_len; /* Size of *iter to be used */
142 struct iov_iter def_iter; /* Default buffer/data iterator */
143 struct iov_iter *write_iter; /* Iterator defining write to be made */
144 struct iov_iter *iter; /* Iterator currently in use */
145 union { /* Convenience for ->def_iter */
146 struct kvec kvec[1];
147 struct bio_vec bvec[1];
148 };
149 void *buffer; /* reply receive buffer */
150 union {
151 struct afs_endpoint_state *probe;
152 struct afs_addr_list *vl_probe;
153 struct afs_addr_list *ret_alist;
154 struct afs_vldb_entry *ret_vldb;
155 char *ret_str;
156 };
157 struct afs_fid fid; /* Primary vnode ID (or all zeroes) */
158 unsigned char probe_index; /* Address in ->probe_alist */
159 struct afs_operation *op;
160 unsigned int server_index;
161 refcount_t ref;
162 enum afs_call_state state;
163 spinlock_t state_lock;
164 int error; /* error code */
165 u32 abort_code; /* Remote abort ID or 0 */
166 unsigned long long remaining; /* How much is left to receive */
167 unsigned int max_lifespan; /* Maximum lifespan in secs to set if not 0 */
168 unsigned request_size; /* size of request data */
169 unsigned reply_max; /* maximum size of reply */
170 unsigned count2; /* count used in unmarshalling */
171 unsigned char unmarshall; /* unmarshalling phase */
172 bool drop_ref; /* T if need to drop ref for incoming call */
173 bool need_attention; /* T if RxRPC poked us */
174 bool async; /* T if asynchronous */
175 bool upgrade; /* T to request service upgrade */
176 bool intr; /* T if interruptible */
177 bool unmarshalling_error; /* T if an unmarshalling error occurred */
178 bool responded; /* Got a response from the call (may be abort) */
179 u8 security_ix; /* Security class */
180 u16 service_id; /* Actual service ID (after upgrade) */
181 unsigned int debug_id; /* Trace ID */
182 u32 enctype; /* Security encoding type */
183 u32 operation_ID; /* operation ID for an incoming call */
184 u32 count; /* count for use in unmarshalling */
185 union { /* place to extract temporary data */
186 struct {
187 __be32 tmp_u;
188 __be32 tmp;
189 } __attribute__((packed));
190 __be64 tmp64;
191 };
192 ktime_t issue_time; /* Time of issue of operation */
193};
194
195struct afs_call_type {
196 const char *name;
197 unsigned int op; /* Really enum afs_fs_operation */
198
199 /* deliver request or reply data to an call
200 * - returning an error will cause the call to be aborted
201 */
202 int (*deliver)(struct afs_call *call);
203
204 /* clean up a call */
205 void (*destructor)(struct afs_call *call);
206
207 /* Async receive processing function */
208 void (*async_rx)(struct work_struct *work);
209
210 /* Work function */
211 void (*work)(struct work_struct *work);
212
213 /* Call done function (gets called immediately on success or failure) */
214 void (*done)(struct afs_call *call);
215
216 /* Handle a call being immediately cancelled. */
217 void (*immediate_cancel)(struct afs_call *call);
218};
219
220/*
221 * Key available for writeback on a file.
222 */
223struct afs_wb_key {
224 refcount_t usage;
225 struct key *key;
226 struct list_head vnode_link; /* Link in vnode->wb_keys */
227};
228
229/*
230 * AFS open file information record. Pointed to by file->private_data.
231 */
232struct afs_file {
233 struct key *key; /* The key this file was opened with */
234 struct afs_wb_key *wb; /* Writeback key record for this file */
235};
236
237static inline struct key *afs_file_key(struct file *file)
238{
239 struct afs_file *af = file->private_data;
240
241 return af->key;
242}
243
244/*
245 * AFS superblock private data
246 * - there's one superblock per volume
247 */
248struct afs_super_info {
249 struct net *net_ns; /* Network namespace */
250 struct afs_cell *cell; /* The cell in which the volume resides */
251 struct afs_volume *volume; /* volume record */
252 enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
253 bool dyn_root; /* True if dynamic root */
254 /* afs_atcell_get_link() reads ->net_ns in rcu pathwalk */
255 struct rcu_head rcu;
256};
257
258static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
259{
260 return sb->s_fs_info;
261}
262
263extern struct file_system_type afs_fs_type;
264
265/*
266 * Set of substitutes for @sys.
267 */
268struct afs_sysnames {
269#define AFS_NR_SYSNAME 16
270 char *subs[AFS_NR_SYSNAME];
271 refcount_t usage;
272 unsigned short nr;
273 char blank[1];
274};
275
276/*
277 * AFS network namespace record.
278 */
279struct afs_net {
280 struct net *net; /* Backpointer to the owning net namespace */
281 struct afs_uuid uuid;
282 bool live; /* F if this namespace is being removed */
283
284 /* AF_RXRPC I/O stuff */
285 struct socket *socket;
286 struct afs_call *spare_incoming_call;
287 struct work_struct charge_preallocation_work;
288 struct work_struct rx_oob_work;
289 struct mutex socket_mutex;
290 atomic_t nr_outstanding_calls;
291 atomic_t nr_superblocks;
292
293 /* Cell database */
294 struct rb_root cells;
295 struct idr cells_dyn_ino; /* cell->dynroot_ino mapping */
296 struct afs_cell __rcu *ws_cell;
297 atomic_t cells_outstanding;
298 struct rw_semaphore cells_lock;
299 struct mutex cells_alias_lock;
300
301 struct mutex proc_cells_lock;
302 struct hlist_head proc_cells;
303
304 /* Known servers. Theoretically each fileserver can only be in one
305 * cell, but in practice, people create aliases and subsets and there's
306 * no easy way to distinguish them.
307 */
308 seqlock_t fs_lock; /* For fs_probe_*, fs_proc */
309 struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
310 struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
311 struct hlist_head fs_proc; /* procfs servers list */
312
313 struct key *fs_cm_token_key; /* Key for creating CM tokens */
314 struct work_struct fs_prober;
315 struct timer_list fs_probe_timer;
316 atomic_t servers_outstanding;
317
318 /* File locking renewal management */
319 struct mutex lock_manager_mutex;
320
321 /* Misc */
322 struct super_block *dynroot_sb; /* Dynamic root mount superblock */
323 struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
324 struct afs_sysnames *sysnames;
325 rwlock_t sysnames_lock;
326 struct afs_addr_preference_list __rcu *address_prefs;
327 u16 address_pref_version;
328
329 /* Statistics counters */
330 atomic_t n_lookup; /* Number of lookups done */
331 atomic_t n_reval; /* Number of dentries needing revalidation */
332 atomic_t n_inval; /* Number of invalidations by the server */
333 atomic_t n_relpg; /* Number of invalidations by release_folio */
334 atomic_t n_read_dir; /* Number of directory pages read */
335 atomic_t n_dir_cr; /* Number of directory entry creation edits */
336 atomic_t n_dir_rm; /* Number of directory entry removal edits */
337 atomic_t n_stores; /* Number of store ops */
338 atomic_long_t n_store_bytes; /* Number of bytes stored */
339 atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
340 atomic_t n_fetches; /* Number of data fetch ops */
341};
342
343extern const char afs_init_sysname[];
344
345enum afs_cell_state {
346 AFS_CELL_SETTING_UP,
347 AFS_CELL_UNLOOKED,
348 AFS_CELL_ACTIVE,
349 AFS_CELL_REMOVING,
350 AFS_CELL_DEAD,
351};
352
353/*
354 * AFS cell record.
355 *
356 * This is a tricky concept to get right as it is possible to create aliases
357 * simply by pointing AFSDB/SRV records for two names at the same set of VL
358 * servers; it is also possible to do things like setting up two sets of VL
359 * servers, one of which provides a superset of the volumes provided by the
360 * other (for internal/external division, for example).
361 *
362 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
363 * servers and (b) a cell's name is used by the client to select the key to use
364 * for authentication and encryption. The cell name is not typically used in
365 * the protocol.
366 *
367 * Two cells are determined to be aliases if they have an explicit alias (YFS
368 * only), share any VL servers in common or have at least one volume in common.
369 * "In common" means that the address list of the VL servers or the fileservers
370 * share at least one endpoint.
371 */
372struct afs_cell {
373 union {
374 struct rcu_head rcu;
375 struct rb_node net_node; /* Node in net->cells */
376 };
377 struct afs_net *net;
378 struct afs_cell *alias_of; /* The cell this is an alias of */
379 struct afs_volume *root_volume; /* The root.cell volume if there is one */
380 struct key *anonymous_key; /* anonymous user key for this cell */
381 struct work_struct destroyer; /* Destroyer for cell */
382 struct work_struct manager; /* Manager for init/deinit/dns */
383 struct timer_list management_timer; /* General management timer */
384 struct hlist_node proc_link; /* /proc cell list link */
385 time64_t dns_expiry; /* Time AFSDB/SRV record expires */
386 time64_t last_inactive; /* Time of last drop of usage count */
387 refcount_t ref; /* Struct refcount */
388 atomic_t active; /* Active usage counter */
389 unsigned long flags;
390#define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
391#define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
392#define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
393#define AFS_CELL_FL_HAVE_INO 3 /* Have dynroot_ino */
394 enum afs_cell_state state;
395 short error;
396 enum dns_record_source dns_source:8; /* Latest source of data from lookup */
397 enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
398 unsigned int dns_lookup_count; /* Counter of DNS lookups */
399 unsigned int debug_id;
400 unsigned int dynroot_ino; /* Inode numbers for dynroot (a pair) */
401
402 /* The volumes belonging to this cell */
403 struct rw_semaphore vs_lock; /* Lock for server->volumes */
404 struct rb_root volumes; /* Tree of volumes on this server */
405 struct hlist_head proc_volumes; /* procfs volume list */
406 seqlock_t volume_lock; /* For volumes */
407
408 /* Active fileserver interaction state. */
409 struct rb_root fs_servers; /* afs_server (by server UUID) */
410 struct rw_semaphore fs_lock; /* For fs_servers */
411
412 /* VL server list. */
413 rwlock_t vl_servers_lock; /* Lock on vl_servers */
414 struct afs_vlserver_list __rcu *vl_servers;
415
416 u8 name_len; /* Length of name */
417 char *name; /* Cell name, case-flattened and NUL-padded */
418 char *key_desc; /* Authentication key description */
419};
420
421/*
422 * Volume Location server record.
423 */
424struct afs_vlserver {
425 struct rcu_head rcu;
426 struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
427 unsigned long flags;
428#define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
429#define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
430#define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
431#define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
432 rwlock_t lock; /* Lock on addresses */
433 refcount_t ref;
434 unsigned int rtt; /* Server's current RTT in uS */
435 unsigned int debug_id;
436
437 /* Probe state */
438 wait_queue_head_t probe_wq;
439 atomic_t probe_outstanding;
440 spinlock_t probe_lock;
441 struct {
442 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
443 u32 abort_code;
444 short error;
445 unsigned short flags;
446#define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
447#define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
448#define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
449#define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
450 } probe;
451
452 u16 service_id; /* Service ID we're using */
453 u16 port;
454 u16 name_len; /* Length of name */
455 char name[]; /* Server name, case-flattened */
456};
457
458/*
459 * Weighted list of Volume Location servers.
460 */
461struct afs_vlserver_entry {
462 u16 priority; /* Preference (as SRV) */
463 u16 weight; /* Weight (as SRV) */
464 enum dns_record_source source:8;
465 enum dns_lookup_status status:8;
466 struct afs_vlserver *server;
467};
468
469struct afs_vlserver_list {
470 struct rcu_head rcu;
471 refcount_t ref;
472 u8 nr_servers;
473 u8 index; /* Server currently in use */
474 u8 preferred; /* Preferred server */
475 enum dns_record_source source:8;
476 enum dns_lookup_status status:8;
477 rwlock_t lock;
478 struct afs_vlserver_entry servers[];
479};
480
481/*
482 * Cached VLDB entry.
483 *
484 * This is pointed to by cell->vldb_entries, indexed by name.
485 */
486struct afs_vldb_entry {
487 afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
488
489 unsigned long flags;
490#define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
491#define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
492#define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
493#define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
494#define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
495
496 uuid_t fs_server[AFS_NMAXNSERVERS];
497 u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
498 u8 fs_mask[AFS_NMAXNSERVERS];
499#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
500#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
501#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
502 u8 vlsf_flags[AFS_NMAXNSERVERS];
503 short error;
504 u8 nr_servers; /* Number of server records */
505 u8 name_len;
506 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
507};
508
509/*
510 * Fileserver endpoint state. The records the addresses of a fileserver's
511 * endpoints and the state and result of a round of probing on them. This
512 * allows the rotation algorithm to access those results without them being
513 * erased by a subsequent round of probing.
514 */
515struct afs_endpoint_state {
516 struct rcu_head rcu;
517 struct afs_addr_list *addresses; /* The addresses being probed */
518 unsigned long responsive_set; /* Bitset of responsive endpoints */
519 unsigned long failed_set; /* Bitset of endpoints we failed to probe */
520 refcount_t ref;
521 unsigned int server_id; /* Debug ID of server */
522 unsigned int probe_seq; /* Probe sequence (from server::probe_counter) */
523 atomic_t nr_probing; /* Number of outstanding probes */
524 unsigned int rtt; /* Best RTT in uS (or UINT_MAX) */
525 s32 abort_code;
526 short error;
527 unsigned long flags;
528#define AFS_ESTATE_RESPONDED 0 /* Set if the server responded */
529#define AFS_ESTATE_SUPERSEDED 1 /* Set if this record has been superseded */
530#define AFS_ESTATE_IS_YFS 2 /* Set if probe upgraded to YFS */
531#define AFS_ESTATE_NOT_YFS 3 /* Set if probe didn't upgrade to YFS */
532#define AFS_ESTATE_LOCAL_FAILURE 4 /* Set if there was a local failure (eg. ENOMEM) */
533};
534
535/*
536 * Record of fileserver with which we're actively communicating.
537 */
538struct afs_server {
539 struct rcu_head rcu;
540 union {
541 uuid_t uuid; /* Server ID */
542 struct afs_uuid _uuid;
543 };
544
545 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
546 struct rb_node uuid_rb; /* Link in cell->fs_servers */
547 struct list_head probe_link; /* Link in net->fs_probe_* */
548 struct hlist_node proc_link; /* Link in net->fs_proc */
549 struct list_head volumes; /* RCU list of afs_server_entry objects */
550 struct work_struct destroyer; /* Work item to try and destroy a server */
551 struct timer_list timer; /* Management timer */
552 struct mutex cm_token_lock; /* Lock governing creation of appdata */
553 struct krb5_buffer cm_rxgk_appdata; /* Appdata to be included in RESPONSE packet */
554 time64_t unuse_time; /* Time at which last unused */
555 unsigned long flags;
556#define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
557#define AFS_SERVER_FL_UPDATING 1
558#define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
559#define AFS_SERVER_FL_UNCREATED 3 /* The record needs creating */
560#define AFS_SERVER_FL_CREATING 4 /* The record is being created */
561#define AFS_SERVER_FL_EXPIRED 5 /* The record has expired */
562#define AFS_SERVER_FL_NOT_FOUND 6 /* VL server says no such server */
563#define AFS_SERVER_FL_VL_FAIL 7 /* Failed to access VL server */
564#define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
565#define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
566#define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
567#define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
568#define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
569#define AFS_SERVER_FL_NO_RENAME2 20 /* YFS Fileserver doesn't support enhanced rename */
570 refcount_t ref; /* Object refcount */
571 atomic_t active; /* Active user count */
572 u32 addr_version; /* Address list version */
573 u16 service_id; /* Service ID we're using. */
574 short create_error; /* Creation error */
575 unsigned int rtt; /* Server's current RTT in uS */
576 unsigned int debug_id; /* Debugging ID for traces */
577
578 /* file service access */
579 rwlock_t fs_lock; /* access lock */
580
581 /* Probe state */
582 struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
583 unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
584 wait_queue_head_t probe_wq;
585 unsigned int probe_counter; /* Number of probes issued */
586 spinlock_t probe_lock;
587};
588
589enum afs_ro_replicating {
590 AFS_RO_NOT_REPLICATING, /* Not doing replication */
591 AFS_RO_REPLICATING_USE_OLD, /* Replicating; use old version */
592 AFS_RO_REPLICATING_USE_NEW, /* Replicating; switch to new version */
593} __mode(byte);
594
595/*
596 * Replaceable volume server list.
597 */
598struct afs_server_entry {
599 struct afs_server *server;
600 struct afs_volume *volume;
601 struct list_head slink; /* Link in server->volumes */
602 time64_t cb_expires_at; /* Time at which volume-level callback expires */
603 unsigned long flags;
604#define AFS_SE_EXCLUDED 0 /* Set if server is to be excluded in rotation */
605#define AFS_SE_VOLUME_OFFLINE 1 /* Set if volume offline notice given */
606#define AFS_SE_VOLUME_BUSY 2 /* Set if volume busy notice given */
607};
608
609struct afs_server_list {
610 struct rcu_head rcu;
611 refcount_t usage;
612 bool attached; /* T if attached to servers */
613 enum afs_ro_replicating ro_replicating; /* RW->RO update (probably) in progress */
614 unsigned char nr_servers;
615 unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
616 unsigned int seq; /* Set to ->servers_seq when installed */
617 rwlock_t lock;
618 struct afs_server_entry servers[];
619};
620
621/*
622 * Live AFS volume management.
623 */
624struct afs_volume {
625 struct rcu_head rcu;
626 afs_volid_t vid; /* The volume ID of this volume */
627 afs_volid_t vids[AFS_MAXTYPES]; /* All associated volume IDs */
628 refcount_t ref;
629 unsigned int debug_id; /* Debugging ID for traces */
630 time64_t update_at; /* Time at which to next update */
631 struct afs_cell *cell; /* Cell to which belongs (pins ref) */
632 struct rb_node cell_node; /* Link in cell->volumes */
633 struct hlist_node proc_link; /* Link in cell->proc_volumes */
634 struct super_block __rcu *sb; /* Superblock on which inodes reside */
635 struct work_struct destructor; /* Deferred destructor */
636 unsigned long flags;
637#define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
638#define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
639#define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
640#define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
641#define AFS_VOLUME_MAYBE_NO_IBULK 4 /* - T if some servers don't have InlineBulkStatus */
642#define AFS_VOLUME_RM_TREE 5 /* - Set if volume removed from cell->volumes */
643#ifdef CONFIG_AFS_FSCACHE
644 struct fscache_volume *cache; /* Caching cookie */
645#endif
646 struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
647 rwlock_t servers_lock; /* Lock for ->servers */
648 unsigned int servers_seq; /* Incremented each time ->servers changes */
649
650 /* RO release tracking */
651 struct mutex volsync_lock; /* Time/state evaluation lock */
652 time64_t creation_time; /* Volume creation time (or TIME64_MIN) */
653 time64_t update_time; /* Volume update time (or TIME64_MIN) */
654
655 /* Callback management */
656 struct mutex cb_check_lock; /* Lock to control race to check after v_break */
657 time64_t cb_expires_at; /* Earliest volume callback expiry time */
658 atomic_t cb_ro_snapshot; /* RO volume update-from-snapshot counter */
659 atomic_t cb_v_break; /* Volume-break event counter. */
660 atomic_t cb_v_check; /* Volume-break has-been-checked counter. */
661 atomic_t cb_scrub; /* Scrub-all-data event counter. */
662 rwlock_t cb_v_break_lock;
663 struct rw_semaphore open_mmaps_lock;
664 struct list_head open_mmaps; /* List of vnodes that are mmapped */
665
666 afs_voltype_t type; /* type of volume */
667 char type_force; /* force volume type (suppress R/O -> R/W) */
668 u8 name_len;
669 u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
670};
671
672enum afs_lock_state {
673 AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
674 AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
675 AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
676 AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
677 AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
678 AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
679 AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
680 AFS_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
681};
682
683/*
684 * AFS inode private data.
685 *
686 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
687 * leak from one inode to another.
688 */
689struct afs_vnode {
690 struct netfs_inode netfs; /* Netfslib context and vfs inode */
691 struct afs_volume *volume; /* volume on which vnode resides */
692 struct afs_fid fid; /* the file identifier for this inode */
693 struct afs_file_status status; /* AFS status info for this file */
694 afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
695 struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
696 struct list_head io_lock_waiters; /* Threads waiting for the I/O lock */
697 struct rw_semaphore validate_lock; /* lock for validating this vnode */
698 struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
699 struct key *silly_key; /* Silly rename key */
700 spinlock_t wb_lock; /* lock for wb_keys */
701 spinlock_t lock; /* waitqueue/flags lock */
702 unsigned long flags;
703#define AFS_VNODE_IO_LOCK 0 /* Set if the I/O serialisation lock is held */
704#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
705#define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
706#define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
707#define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
708#define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
709#define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
710#define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
711#define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
712#define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
713#define AFS_VNODE_DIR_READ 11 /* Set if we've read a dir's contents */
714
715 struct folio_queue *directory; /* Directory contents */
716 struct afs_symlink __rcu *symlink; /* Symlink content */
717 struct list_head wb_keys; /* List of keys available for writeback */
718 struct list_head pending_locks; /* locks waiting to be granted */
719 struct list_head granted_locks; /* locks granted on this file */
720 struct delayed_work lock_work; /* work to be done in locking */
721 struct key *lock_key; /* Key to be used in lock ops */
722 ktime_t locked_at; /* Time at which lock obtained */
723 enum afs_lock_state lock_state : 8;
724 afs_lock_type_t lock_type : 8;
725 unsigned int directory_size; /* Amount of space in ->directory */
726
727 /* outstanding callback notification on this file */
728 struct work_struct cb_work; /* Work for mmap'd files */
729 struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
730 void *cb_server; /* Server with callback/filelock */
731 atomic_t cb_nr_mmap; /* Number of mmaps */
732 unsigned int cb_ro_snapshot; /* RO volume release counter on ->volume */
733 unsigned int cb_scrub; /* Scrub counter on ->volume */
734 unsigned int cb_break; /* Break counter on vnode */
735 unsigned int cb_v_check; /* Break check counter on ->volume */
736 seqlock_t cb_lock; /* Lock for ->cb_server, ->status, ->cb_*break */
737
738 atomic64_t cb_expires_at; /* time at which callback expires */
739#define AFS_NO_CB_PROMISE TIME64_MIN
740};
741
742static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
743{
744#ifdef CONFIG_AFS_FSCACHE
745 return netfs_i_cookie(&vnode->netfs);
746#else
747 return NULL;
748#endif
749}
750
751static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
752 struct fscache_cookie *cookie)
753{
754#ifdef CONFIG_AFS_FSCACHE
755 vnode->netfs.cache = cookie;
756#endif
757}
758
759/*
760 * cached security record for one user's attempt to access a vnode
761 */
762struct afs_permit {
763 struct key *key; /* RxRPC ticket holding a security context */
764 afs_access_t access; /* CallerAccess value for this key */
765};
766
767/*
768 * Immutable cache of CallerAccess records from attempts to access vnodes.
769 * These may be shared between multiple vnodes.
770 */
771struct afs_permits {
772 struct rcu_head rcu;
773 struct hlist_node hash_node; /* Link in hash */
774 unsigned long h; /* Hash value for this permit list */
775 refcount_t usage;
776 unsigned short nr_permits; /* Number of records */
777 bool invalidated; /* Invalidated due to key change */
778 struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
779};
780
781/*
782 * Copy of symlink content for normal use.
783 */
784struct afs_symlink {
785 struct rcu_head rcu;
786 refcount_t ref;
787 char content[];
788};
789
790/*
791 * Error prioritisation and accumulation.
792 */
793struct afs_error {
794 s32 abort_code; /* Cumulative abort code */
795 short error; /* Cumulative error */
796 bool responded; /* T if server responded */
797 bool aborted; /* T if ->error is from an abort */
798};
799
800/*
801 * Cursor for iterating over a set of volume location servers.
802 */
803struct afs_vl_cursor {
804 struct afs_cell *cell; /* The cell we're querying */
805 struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
806 struct afs_vlserver *server; /* Server on which this resides */
807 struct afs_addr_list *alist; /* Current address list (pins ref) */
808 struct key *key; /* Key for the server */
809 unsigned long untried_servers; /* Bitmask of untried servers */
810 unsigned long addr_tried; /* Tried addresses */
811 struct afs_error cumul_error; /* Cumulative error */
812 unsigned int debug_id;
813 s32 call_abort_code;
814 short call_error; /* Error from single call */
815 short server_index; /* Current server */
816 signed char addr_index; /* Current address */
817 unsigned short flags;
818#define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
819#define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
820#define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
821 short nr_iterations; /* Number of server iterations */
822 bool call_responded; /* T if the current address responded */
823};
824
825/*
826 * Fileserver state tracking for an operation. An array of these is kept,
827 * indexed by server index.
828 */
829struct afs_server_state {
830 /* Tracking of fileserver probe state. Other operations may interfere
831 * by probing a fileserver when accessing other volumes.
832 */
833 unsigned int probe_seq;
834 unsigned long untried_addrs; /* Addresses we haven't tried yet */
835 struct wait_queue_entry probe_waiter;
836 struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
837};
838
839/*
840 * Fileserver operation methods.
841 */
842struct afs_operation_ops {
843 void (*issue_afs_rpc)(struct afs_operation *op);
844 void (*issue_yfs_rpc)(struct afs_operation *op);
845 void (*success)(struct afs_operation *op);
846 void (*aborted)(struct afs_operation *op);
847 void (*failed)(struct afs_operation *op);
848 void (*edit_dir)(struct afs_operation *op);
849 void (*put)(struct afs_operation *op);
850};
851
852struct afs_vnode_param {
853 struct afs_vnode *vnode;
854 struct afs_fid fid; /* Fid to access */
855 struct afs_status_cb scb; /* Returned status and callback promise */
856 afs_dataversion_t dv_before; /* Data version before the call */
857 unsigned int cb_break_before; /* cb_break before the call */
858 u8 dv_delta; /* Expected change in data version */
859 bool put_vnode:1; /* T if we have a ref on the vnode */
860 bool need_io_lock:1; /* T if we need the I/O lock on this */
861 bool update_ctime:1; /* Need to update the ctime */
862 bool set_size:1; /* Must update i_size */
863 bool op_unlinked:1; /* True if file was unlinked by op */
864 bool speculative:1; /* T if speculative status fetch (no vnode lock) */
865 bool modification:1; /* Set if the content gets modified */
866};
867
868/*
869 * Fileserver operation wrapper, handling server and address rotation
870 * asynchronously. May make simultaneous calls to multiple servers.
871 */
872struct afs_operation {
873 struct afs_net *net; /* Network namespace */
874 struct key *key; /* Key for the cell */
875 const struct afs_call_type *type; /* Type of call done */
876 const struct afs_operation_ops *ops;
877
878 /* Parameters/results for the operation */
879 struct afs_volume *volume; /* Volume being accessed */
880 struct afs_vnode_param file[2];
881 struct afs_vnode_param *more_files;
882 struct afs_volsync pre_volsync; /* Volsync before op */
883 struct afs_volsync volsync; /* Volsync returned by op */
884 struct dentry *dentry; /* Dentry to be altered */
885 struct dentry *dentry_2; /* Second dentry to be altered */
886 struct timespec64 mtime; /* Modification time to record */
887 struct timespec64 ctime; /* Change time to set */
888 struct afs_error cumul_error; /* Cumulative error */
889 short nr_files; /* Number of entries in file[], more_files */
890 unsigned int debug_id;
891
892 unsigned int cb_v_break; /* Volume break counter before op */
893
894 union {
895 struct {
896 int which; /* Which ->file[] to fetch for */
897 } fetch_status;
898 struct {
899 int reason; /* enum afs_edit_dir_reason */
900 mode_t mode;
901 struct afs_symlink *symlink;
902 } create;
903 struct {
904 bool need_rehash;
905 } unlink;
906 struct {
907 struct dentry *rehash;
908 struct dentry *tmp;
909 unsigned int rename_flags;
910 bool new_negative;
911 } rename;
912 struct {
913 struct netfs_io_subrequest *subreq;
914 } fetch;
915 struct {
916 afs_lock_type_t type;
917 } lock;
918 struct {
919 struct iov_iter *write_iter;
920 loff_t pos;
921 loff_t size;
922 loff_t i_size;
923 } store;
924 struct {
925 struct iattr *attr;
926 loff_t old_i_size;
927 } setattr;
928 struct afs_acl *acl;
929 struct yfs_acl *yacl;
930 struct {
931 struct afs_volume_status vs;
932 struct kstatfs *buf;
933 } volstatus;
934 };
935
936 /* Fileserver iteration state */
937 struct afs_server_list *server_list; /* Current server list (pins ref) */
938 struct afs_server *server; /* Server we're using (ref pinned by server_list) */
939 struct afs_endpoint_state *estate; /* Current endpoint state (doesn't pin ref) */
940 struct afs_server_state *server_states; /* States of the servers involved */
941 struct afs_call *call;
942 unsigned long untried_servers; /* Bitmask of untried servers */
943 unsigned long addr_tried; /* Tried addresses */
944 s32 call_abort_code; /* Abort code from single call */
945 short call_error; /* Error from single call */
946 short server_index; /* Current server */
947 short nr_iterations; /* Number of server iterations */
948 signed char addr_index; /* Current address */
949 bool call_responded; /* T if the current address responded */
950
951 unsigned int flags;
952#define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
953#define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
954#define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
955#define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
956#define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
957#define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
958#define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
959#define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
960#define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
961#define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
962#define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
963#define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
964#define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
965#define AFS_OPERATION_ASYNC 0x2000 /* Set if should run asynchronously */
966};
967
968/*
969 * Cache auxiliary data.
970 */
971struct afs_vnode_cache_aux {
972 __be64 data_version;
973} __packed;
974
975static inline void afs_set_cache_aux(struct afs_vnode *vnode,
976 struct afs_vnode_cache_aux *aux)
977{
978 aux->data_version = cpu_to_be64(vnode->status.data_version);
979}
980
981static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
982{
983 struct afs_vnode_cache_aux aux;
984
985 afs_set_cache_aux(vnode, &aux);
986 fscache_invalidate(afs_vnode_cache(vnode), &aux,
987 i_size_read(&vnode->netfs.inode), flags);
988}
989
990/*
991 * Directory iteration management.
992 */
993struct afs_dir_iter {
994 struct afs_vnode *dvnode;
995 union afs_xdr_dir_block *block;
996 struct folio_queue *fq;
997 unsigned int fpos;
998 int fq_slot;
999 unsigned int loop_check;
1000 u8 nr_slots;
1001 u8 bucket;
1002 unsigned int prev_entry;
1003};
1004
1005#include <trace/events/afs.h>
1006
1007/*****************************************************************************/
1008/*
1009 * addr_list.c
1010 */
1011struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
1012extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
1013extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
1014extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
1015 const char *, size_t, char,
1016 unsigned short, unsigned short);
1017bool afs_addr_list_same(const struct afs_addr_list *a,
1018 const struct afs_addr_list *b);
1019extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
1020
1021extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1022 __be32 xdr, u16 port);
1023extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1024 __be32 *xdr, u16 port);
1025void afs_set_peer_appdata(struct afs_server *server,
1026 struct afs_addr_list *old_alist,
1027 struct afs_addr_list *new_alist);
1028
1029/*
1030 * addr_prefs.c
1031 */
1032int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1033void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1034void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
1035
1036/*
1037 * callback.c
1038 */
1039extern void afs_invalidate_mmap_work(struct work_struct *);
1040extern void afs_init_callback_state(struct afs_server *);
1041extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1042extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1043extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1044
1045static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1046{
1047 return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1048}
1049
1050static inline bool afs_cb_is_broken(unsigned int cb_break,
1051 const struct afs_vnode *vnode)
1052{
1053 return cb_break != (vnode->cb_break +
1054 atomic_read(&vnode->volume->cb_ro_snapshot) +
1055 atomic_read(&vnode->volume->cb_scrub));
1056}
1057
1058/*
1059 * cell.c
1060 */
1061extern int afs_cell_init(struct afs_net *, const char *);
1062extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1063 enum afs_cell_trace);
1064enum afs_lookup_cell_for {
1065 AFS_LOOKUP_CELL_DYNROOT,
1066 AFS_LOOKUP_CELL_MOUNTPOINT,
1067 AFS_LOOKUP_CELL_DIRECT_MOUNT,
1068 AFS_LOOKUP_CELL_PRELOAD,
1069 AFS_LOOKUP_CELL_ROOTCELL,
1070 AFS_LOOKUP_CELL_ALIAS_CHECK,
1071};
1072struct afs_cell *afs_lookup_cell(struct afs_net *net,
1073 const char *name, unsigned int namesz,
1074 const char *vllist,
1075 enum afs_lookup_cell_for reason,
1076 enum afs_cell_trace trace);
1077extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1078void afs_unuse_cell(struct afs_cell *cell, enum afs_cell_trace reason);
1079extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1080extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1081extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1082extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1083void afs_set_cell_timer(struct afs_cell *cell, unsigned int delay_secs);
1084extern void __net_exit afs_cell_purge(struct afs_net *);
1085
1086/*
1087 * cmservice.c
1088 */
1089extern bool afs_cm_incoming_call(struct afs_call *);
1090
1091/*
1092 * cm_security.c
1093 */
1094void afs_process_oob_queue(struct work_struct *work);
1095#ifdef CONFIG_RXGK
1096int afs_create_token_key(struct afs_net *net, struct socket *socket);
1097#else
1098static inline int afs_create_token_key(struct afs_net *net, struct socket *socket)
1099{
1100 return 0;
1101}
1102#endif
1103
1104/*
1105 * dir.c
1106 */
1107extern const struct file_operations afs_dir_file_operations;
1108extern const struct inode_operations afs_dir_inode_operations;
1109extern const struct address_space_operations afs_dir_aops;
1110extern const struct dentry_operations afs_fs_dentry_operations;
1111
1112ssize_t afs_read_dir(struct afs_vnode *dvnode, struct file *file)
1113 __acquires(&dvnode->validate_lock);
1114extern void afs_d_release(struct dentry *);
1115extern void afs_check_for_remote_deletion(struct afs_operation *);
1116
1117/*
1118 * dir_edit.c
1119 */
1120extern void afs_edit_dir_add(struct afs_vnode *, const struct qstr *, struct afs_fid *,
1121 enum afs_edit_dir_reason);
1122extern void afs_edit_dir_remove(struct afs_vnode *, const struct qstr *, enum afs_edit_dir_reason);
1123void afs_edit_dir_update(struct afs_vnode *vnode, const struct qstr *name,
1124 struct afs_vnode *new_dvnode, enum afs_edit_dir_reason why);
1125void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode);
1126
1127/*
1128 * dir_search.c
1129 */
1130unsigned int afs_dir_hash_name(const struct qstr *name);
1131bool afs_dir_init_iter(struct afs_dir_iter *iter, const struct qstr *name);
1132union afs_xdr_dir_block *afs_dir_find_block(struct afs_dir_iter *iter, size_t block);
1133int afs_dir_search_bucket(struct afs_dir_iter *iter, const struct qstr *name,
1134 struct afs_fid *_fid);
1135int afs_dir_search(struct afs_vnode *dvnode, const struct qstr *name,
1136 struct afs_fid *_fid, afs_dataversion_t *_dir_version);
1137
1138static inline void afs_dir_end_iter(struct afs_dir_iter *iter)
1139{
1140 if (iter->block) {
1141 kunmap_local(iter->block);
1142 iter->block = NULL;
1143 }
1144}
1145
1146/*
1147 * dir_silly.c
1148 */
1149extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1150 struct dentry *, struct key *);
1151extern int afs_silly_iput(struct dentry *, struct inode *);
1152
1153/*
1154 * dynroot.c
1155 */
1156extern const struct inode_operations afs_dynroot_inode_operations;
1157extern const struct dentry_operations afs_dynroot_dentry_operations;
1158
1159struct inode *afs_dynroot_iget_root(struct super_block *sb);
1160
1161/*
1162 * file.c
1163 */
1164extern const struct address_space_operations afs_file_aops;
1165extern const struct inode_operations afs_file_inode_operations;
1166extern const struct file_operations afs_file_operations;
1167extern const struct afs_operation_ops afs_fetch_data_operation;
1168extern const struct netfs_request_ops afs_req_ops;
1169
1170extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1171extern void afs_put_wb_key(struct afs_wb_key *);
1172extern int afs_open(struct inode *, struct file *);
1173extern int afs_release(struct inode *, struct file *);
1174void afs_fetch_data_async_rx(struct work_struct *work);
1175void afs_fetch_data_immediate_cancel(struct afs_call *call);
1176void afs_set_i_size(struct afs_vnode *vnode, uoff_t new_i_size);
1177
1178/*
1179 * flock.c
1180 */
1181extern struct workqueue_struct *afs_lock_manager;
1182
1183extern void afs_lock_op_done(struct afs_call *);
1184extern void afs_lock_work(struct work_struct *);
1185extern void afs_lock_may_be_available(struct afs_vnode *);
1186extern int afs_lock(struct file *, int, struct file_lock *);
1187extern int afs_flock(struct file *, int, struct file_lock *);
1188
1189/*
1190 * fsclient.c
1191 */
1192extern void afs_fs_fetch_status(struct afs_operation *);
1193extern void afs_fs_fetch_data(struct afs_operation *);
1194extern void afs_fs_create_file(struct afs_operation *);
1195extern void afs_fs_make_dir(struct afs_operation *);
1196extern void afs_fs_remove_file(struct afs_operation *);
1197extern void afs_fs_remove_dir(struct afs_operation *);
1198extern void afs_fs_link(struct afs_operation *);
1199extern void afs_fs_symlink(struct afs_operation *);
1200extern void afs_fs_rename(struct afs_operation *);
1201extern void afs_fs_store_data(struct afs_operation *);
1202extern void afs_fs_setattr(struct afs_operation *);
1203extern void afs_fs_get_volume_status(struct afs_operation *);
1204extern void afs_fs_set_lock(struct afs_operation *);
1205extern void afs_fs_extend_lock(struct afs_operation *);
1206extern void afs_fs_release_lock(struct afs_operation *);
1207int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1208 struct afs_address *addr, struct key *key);
1209bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1210 struct afs_endpoint_state *estate, unsigned int addr_index,
1211 struct key *key);
1212extern void afs_fs_inline_bulk_status(struct afs_operation *);
1213
1214struct afs_acl {
1215 u32 size;
1216 u8 data[] __counted_by(size);
1217};
1218
1219extern void afs_fs_fetch_acl(struct afs_operation *);
1220extern void afs_fs_store_acl(struct afs_operation *);
1221
1222/*
1223 * fs_operation.c
1224 */
1225extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1226extern int afs_put_operation(struct afs_operation *);
1227extern bool afs_begin_vnode_operation(struct afs_operation *);
1228extern void afs_end_vnode_operation(struct afs_operation *op);
1229extern void afs_wait_for_operation(struct afs_operation *);
1230extern int afs_do_sync_operation(struct afs_operation *);
1231
1232static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1233 struct afs_vnode *vnode)
1234{
1235 op->file[n].vnode = vnode;
1236 op->file[n].need_io_lock = true;
1237}
1238
1239static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1240 const struct afs_fid *fid)
1241{
1242 op->file[n].fid = *fid;
1243}
1244
1245/*
1246 * fs_probe.c
1247 */
1248struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1249 enum afs_estate_trace where);
1250void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1251extern void afs_fileserver_probe_result(struct afs_call *);
1252int afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1253 struct afs_addr_list *new_alist, struct key *key);
1254int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1255extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1256extern void afs_fs_probe_dispatcher(struct work_struct *);
1257int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1258 unsigned long exclude, bool is_intr);
1259extern void afs_fs_probe_cleanup(struct afs_net *);
1260
1261/*
1262 * inode.c
1263 */
1264extern const struct afs_operation_ops afs_fetch_status_operation;
1265
1266extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1267extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1268extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1269extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1270extern struct inode *afs_root_iget(struct super_block *, struct key *);
1271extern int afs_getattr(const struct mnt_idmap *idmap, const struct path *,
1272 struct kstat *, u32, unsigned int);
1273extern int afs_setattr(const struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1274extern void afs_evict_inode(struct inode *);
1275extern int afs_drop_inode(struct inode *);
1276
1277/*
1278 * main.c
1279 */
1280extern struct workqueue_struct *afs_wq;
1281extern int afs_net_id;
1282
1283static inline struct afs_net *afs_net(struct net *net)
1284{
1285 return net_generic(net, afs_net_id);
1286}
1287
1288static inline struct afs_net *afs_sb2net(struct super_block *sb)
1289{
1290 return afs_net(AFS_FS_S(sb)->net_ns);
1291}
1292
1293static inline struct afs_net *afs_d2net(struct dentry *dentry)
1294{
1295 return afs_sb2net(dentry->d_sb);
1296}
1297
1298static inline struct afs_net *afs_i2net(struct inode *inode)
1299{
1300 return afs_sb2net(inode->i_sb);
1301}
1302
1303static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1304{
1305 return afs_i2net(&vnode->netfs.inode);
1306}
1307
1308static inline struct afs_net *afs_sock2net(struct sock *sk)
1309{
1310 return net_generic(sock_net(sk), afs_net_id);
1311}
1312
1313static inline void __afs_stat(atomic_t *s)
1314{
1315 atomic_inc(s);
1316}
1317
1318#define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1319
1320/*
1321 * misc.c
1322 */
1323extern int afs_abort_to_error(u32);
1324extern void afs_prioritise_error(struct afs_error *, int, u32);
1325
1326static inline void afs_op_nomem(struct afs_operation *op)
1327{
1328 op->cumul_error.error = -ENOMEM;
1329}
1330
1331static inline int afs_op_error(const struct afs_operation *op)
1332{
1333 return op->cumul_error.error;
1334}
1335
1336static inline s32 afs_op_abort_code(const struct afs_operation *op)
1337{
1338 return op->cumul_error.abort_code;
1339}
1340
1341static inline int afs_op_set_error(struct afs_operation *op, int error)
1342{
1343 return op->cumul_error.error = error;
1344}
1345
1346static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1347{
1348 afs_prioritise_error(&op->cumul_error, error, abort_code);
1349}
1350
1351/*
1352 * mntpt.c
1353 */
1354extern const struct inode_operations afs_mntpt_inode_operations;
1355extern const struct inode_operations afs_autocell_inode_operations;
1356extern const struct file_operations afs_mntpt_file_operations;
1357
1358extern struct vfsmount *afs_d_automount(struct path *);
1359extern void afs_mntpt_kill_timer(void);
1360
1361/*
1362 * proc.c
1363 */
1364#ifdef CONFIG_PROC_FS
1365extern int __net_init afs_proc_init(struct afs_net *);
1366extern void __net_exit afs_proc_cleanup(struct afs_net *);
1367extern int afs_proc_cell_setup(struct afs_cell *);
1368extern void afs_proc_cell_remove(struct afs_cell *);
1369extern void afs_put_sysnames(struct afs_sysnames *);
1370#else
1371static inline int afs_proc_init(struct afs_net *net) { return 0; }
1372static inline void afs_proc_cleanup(struct afs_net *net) {}
1373static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
1374static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
1375static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1376#endif
1377
1378/*
1379 * rotate.c
1380 */
1381void afs_clear_server_states(struct afs_operation *op);
1382extern bool afs_select_fileserver(struct afs_operation *);
1383extern void afs_dump_edestaddrreq(const struct afs_operation *);
1384
1385/*
1386 * rxrpc.c
1387 */
1388extern struct workqueue_struct *afs_async_calls;
1389
1390extern int __net_init afs_open_socket(struct afs_net *);
1391extern void __net_exit afs_close_socket(struct afs_net *);
1392extern void afs_charge_preallocation(struct work_struct *);
1393extern void afs_put_call(struct afs_call *);
1394void afs_deferred_put_call(struct afs_call *call);
1395void afs_make_call(struct afs_call *call, gfp_t gfp);
1396void afs_deliver_to_call(struct afs_call *call);
1397void afs_wait_for_call_to_complete(struct afs_call *call);
1398extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1399 const struct afs_call_type *,
1400 size_t, size_t);
1401extern void afs_flat_call_destructor(struct afs_call *);
1402extern void afs_send_empty_reply(struct afs_call *);
1403extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1404extern int afs_extract_data(struct afs_call *, bool);
1405extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1406
1407static inline struct afs_call *afs_get_call(struct afs_call *call,
1408 enum afs_call_trace why)
1409{
1410 int r;
1411
1412 __refcount_inc(&call->ref, &r);
1413
1414 trace_afs_call(call->debug_id, why, r + 1,
1415 atomic_read(&call->net->nr_outstanding_calls),
1416 __builtin_return_address(0));
1417 return call;
1418}
1419
1420static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why)
1421{
1422 int r = refcount_read(&call->ref);
1423
1424 trace_afs_call(call->debug_id, why, r,
1425 atomic_read(&call->net->nr_outstanding_calls),
1426 __builtin_return_address(0));
1427}
1428
1429static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1430 gfp_t gfp)
1431{
1432 struct afs_addr_list *alist = op->estate->addresses;
1433
1434 op->call = afs_get_call(call, afs_call_trace_get);
1435 op->type = call->type;
1436 call->op = op;
1437 call->key = op->key;
1438 call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1439 call->peer = rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1440 call->service_id = op->server->service_id;
1441 afs_make_call(call, gfp);
1442 afs_put_call(call);
1443}
1444
1445static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1446{
1447 call->iov_len = size;
1448 call->kvec[0].iov_base = buf;
1449 call->kvec[0].iov_len = size;
1450 iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1451}
1452
1453static inline void afs_extract_to_tmp(struct afs_call *call)
1454{
1455 call->iov_len = sizeof(call->tmp);
1456 afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1457}
1458
1459static inline void afs_extract_to_tmp64(struct afs_call *call)
1460{
1461 call->iov_len = sizeof(call->tmp64);
1462 afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1463}
1464
1465static inline void afs_extract_discard(struct afs_call *call, size_t size)
1466{
1467 call->iov_len = size;
1468 iov_iter_discard(&call->def_iter, ITER_DEST, size);
1469}
1470
1471static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1472{
1473 call->iov_len = size;
1474 afs_extract_begin(call, call->buffer, size);
1475}
1476
1477static inline int afs_transfer_reply(struct afs_call *call)
1478{
1479 return afs_extract_data(call, false);
1480}
1481
1482static inline bool afs_check_call_state(struct afs_call *call,
1483 enum afs_call_state state)
1484{
1485 return READ_ONCE(call->state) == state;
1486}
1487
1488static inline bool afs_set_call_state(struct afs_call *call,
1489 enum afs_call_state from,
1490 enum afs_call_state to)
1491{
1492 bool ok = false;
1493
1494 spin_lock_bh(&call->state_lock);
1495 if (call->state == from) {
1496 call->state = to;
1497 trace_afs_call_state(call, from, to, 0, 0);
1498 ok = true;
1499 }
1500 spin_unlock_bh(&call->state_lock);
1501 return ok;
1502}
1503
1504static inline void afs_set_call_complete(struct afs_call *call,
1505 int error, u32 remote_abort)
1506{
1507 enum afs_call_state state;
1508 bool ok = false;
1509
1510 spin_lock_bh(&call->state_lock);
1511 state = call->state;
1512 if (state != AFS_CALL_COMPLETE) {
1513 call->abort_code = remote_abort;
1514 call->error = error;
1515 call->state = AFS_CALL_COMPLETE;
1516 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1517 error, remote_abort);
1518 ok = true;
1519 }
1520 spin_unlock_bh(&call->state_lock);
1521 if (ok) {
1522 trace_afs_call_done(call);
1523
1524 /* Asynchronous calls have two refs to release - one from the alloc and
1525 * one queued with the work item - and we can't just deallocate the
1526 * call because the work item may be queued again.
1527 */
1528 if (call->drop_ref)
1529 afs_put_call(call);
1530 }
1531}
1532
1533/*
1534 * security.c
1535 */
1536extern void afs_put_permits(struct afs_permits *);
1537extern void afs_clear_permits(struct afs_vnode *);
1538extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1539 struct afs_status_cb *);
1540extern struct key *afs_request_key(struct afs_cell *);
1541extern struct key *afs_request_key_rcu(struct afs_cell *);
1542extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1543extern int afs_permission(const struct mnt_idmap *, struct inode *, int);
1544extern void __exit afs_clean_up_permit_cache(void);
1545
1546/*
1547 * server.c
1548 */
1549extern spinlock_t afs_server_peer_lock;
1550
1551struct afs_server *afs_find_server(const struct rxrpc_peer *peer);
1552extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1553extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1554struct afs_server *afs_use_server(struct afs_server *server, bool activate,
1555 enum afs_server_trace reason);
1556void afs_unuse_server(struct afs_net *net, struct afs_server *server,
1557 enum afs_server_trace reason);
1558void afs_unuse_server_notime(struct afs_net *net, struct afs_server *server,
1559 enum afs_server_trace reason);
1560extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1561void afs_purge_servers(struct afs_cell *cell);
1562extern void afs_fs_probe_timer(struct timer_list *);
1563void __net_exit afs_wait_for_servers(struct afs_net *net);
1564bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1565
1566static inline void afs_see_server(struct afs_server *server, enum afs_server_trace trace)
1567{
1568 int r = refcount_read(&server->ref);
1569 int a = atomic_read(&server->active);
1570
1571 trace_afs_server(server->debug_id, r, a, trace);
1572
1573}
1574
1575static inline void afs_inc_servers_outstanding(struct afs_net *net)
1576{
1577 atomic_inc(&net->servers_outstanding);
1578}
1579
1580static inline void afs_dec_servers_outstanding(struct afs_net *net)
1581{
1582 if (atomic_dec_and_test(&net->servers_outstanding))
1583 wake_up_var(&net->servers_outstanding);
1584}
1585
1586static inline bool afs_is_probing_server(struct afs_server *server)
1587{
1588 return list_empty(&server->probe_link);
1589}
1590
1591/*
1592 * server_list.c
1593 */
1594static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1595{
1596 refcount_inc(&slist->usage);
1597 return slist;
1598}
1599
1600extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1601struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1602 struct key *key,
1603 struct afs_vldb_entry *vldb);
1604extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1605void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1606void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1607 struct afs_server_list *old);
1608void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1609
1610/*
1611 * super.c
1612 */
1613extern int __init afs_fs_init(void);
1614extern void afs_fs_exit(void);
1615
1616/*
1617 * symlink.c
1618 */
1619extern const struct inode_operations afs_symlink_inode_operations;
1620extern const struct address_space_operations afs_symlink_aops;
1621
1622void afs_invalidate_symlink(struct afs_vnode *vnode);
1623void afs_evict_symlink(struct afs_vnode *vnode);
1624void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op);
1625const char *afs_get_link(struct dentry *dentry, struct inode *inode,
1626 struct delayed_call *callback);
1627int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
1628int afs_symlink_writepages(struct address_space *mapping,
1629 struct writeback_control *wbc);
1630
1631/*
1632 * validation.c
1633 */
1634bool afs_check_validity(const struct afs_vnode *vnode);
1635int afs_update_volume_state(struct afs_operation *op);
1636int afs_validate(struct afs_vnode *vnode, struct key *key);
1637
1638/*
1639 * vlclient.c
1640 */
1641extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1642 const char *, int);
1643extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1644struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1645 struct afs_addr_list *alist,
1646 unsigned int addr_index,
1647 struct key *key,
1648 struct afs_vlserver *server,
1649 unsigned int server_index);
1650extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1651extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1652
1653/*
1654 * vl_alias.c
1655 */
1656extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1657
1658/*
1659 * vl_probe.c
1660 */
1661extern void afs_vlserver_probe_result(struct afs_call *);
1662extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1663extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1664
1665/*
1666 * vl_rotate.c
1667 */
1668extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1669 struct afs_cell *, struct key *);
1670extern bool afs_select_vlserver(struct afs_vl_cursor *);
1671extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1672extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1673
1674/*
1675 * vlserver_list.c
1676 */
1677static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1678{
1679 refcount_inc(&vlserver->ref);
1680 return vlserver;
1681}
1682
1683static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1684{
1685 if (vllist)
1686 refcount_inc(&vllist->ref);
1687 return vllist;
1688}
1689
1690extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1691extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1692extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1693extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1694extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1695 const void *, size_t);
1696
1697/*
1698 * volume.c
1699 */
1700extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1701extern int afs_activate_volume(struct afs_volume *);
1702extern void afs_deactivate_volume(struct afs_volume *);
1703bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1704extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1705void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1706extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1707
1708/*
1709 * write.c
1710 */
1711void afs_prepare_write(struct netfs_io_subrequest *subreq);
1712void afs_issue_write(struct netfs_io_subrequest *subreq);
1713void afs_begin_writeback(struct netfs_io_request *wreq);
1714void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
1715extern int afs_writepages(struct address_space *, struct writeback_control *);
1716extern int afs_fsync(struct file *, loff_t, loff_t, int);
1717extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1718extern void afs_prune_wb_keys(struct afs_vnode *);
1719
1720/*
1721 * xattr.c
1722 */
1723extern const struct xattr_handler * const afs_xattr_handlers[];
1724
1725/*
1726 * yfsclient.c
1727 */
1728extern void yfs_fs_fetch_data(struct afs_operation *);
1729extern void yfs_fs_create_file(struct afs_operation *);
1730extern void yfs_fs_make_dir(struct afs_operation *);
1731extern void yfs_fs_remove_file2(struct afs_operation *);
1732extern void yfs_fs_remove_file(struct afs_operation *);
1733extern void yfs_fs_remove_dir(struct afs_operation *);
1734extern void yfs_fs_link(struct afs_operation *);
1735extern void yfs_fs_symlink(struct afs_operation *);
1736extern void yfs_fs_rename(struct afs_operation *);
1737void yfs_fs_rename_replace(struct afs_operation *op);
1738void yfs_fs_rename_noreplace(struct afs_operation *op);
1739void yfs_fs_rename_exchange(struct afs_operation *op);
1740extern void yfs_fs_store_data(struct afs_operation *);
1741extern void yfs_fs_setattr(struct afs_operation *);
1742extern void yfs_fs_get_volume_status(struct afs_operation *);
1743extern void yfs_fs_set_lock(struct afs_operation *);
1744extern void yfs_fs_extend_lock(struct afs_operation *);
1745extern void yfs_fs_release_lock(struct afs_operation *);
1746extern void yfs_fs_fetch_status(struct afs_operation *);
1747extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1748
1749struct yfs_acl {
1750 struct afs_acl *acl; /* Dir/file/symlink ACL */
1751 struct afs_acl *vol_acl; /* Whole volume ACL */
1752 u32 inherit_flag; /* True if ACL is inherited from parent dir */
1753 u32 num_cleaned; /* Number of ACEs removed due to subject removal */
1754 unsigned int flags;
1755#define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
1756#define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
1757};
1758
1759extern void yfs_free_opaque_acl(struct yfs_acl *);
1760extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1761extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1762
1763/*
1764 * Miscellaneous inline functions.
1765 */
1766static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1767{
1768 return container_of(inode, struct afs_vnode, netfs.inode);
1769}
1770
1771static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1772{
1773 return &vnode->netfs.inode;
1774}
1775
1776/*
1777 * Note that a dentry got changed. We need to set d_fsdata to the data version
1778 * number derived from the result of the operation. It doesn't matter if
1779 * d_fsdata goes backwards as we'll just revalidate.
1780 */
1781static inline void afs_update_dentry_version(struct afs_operation *op,
1782 struct afs_vnode_param *dir_vp,
1783 struct dentry *dentry)
1784{
1785 if (!op->cumul_error.error)
1786 dentry->d_fsdata =
1787 (void *)(unsigned long)dir_vp->scb.status.data_version;
1788}
1789
1790/*
1791 * Check for a conflicting operation on a directory that we just unlinked from.
1792 * If someone managed to sneak a link or an unlink in on the file we just
1793 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1794 */
1795static inline void afs_check_dir_conflict(struct afs_operation *op,
1796 struct afs_vnode_param *dvp)
1797{
1798 if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1799 op->flags |= AFS_OPERATION_DIR_CONFLICT;
1800}
1801
1802static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1803{
1804 trace_afs_io_error(call->debug_id, -EIO, where);
1805 return -EIO;
1806}
1807
1808static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1809{
1810 trace_afs_file_error(vnode, -EIO, where);
1811 return -EIO;
1812}
1813
1814/*
1815 * Set the callback promise on a vnode.
1816 */
1817static inline void afs_set_cb_promise(struct afs_vnode *vnode, time64_t expires_at,
1818 enum afs_cb_promise_trace trace)
1819{
1820 atomic64_set(&vnode->cb_expires_at, expires_at);
1821 trace_afs_cb_promise(vnode, trace);
1822}
1823
1824/*
1825 * Clear the callback promise on a vnode, returning true if it was promised.
1826 */
1827static inline bool afs_clear_cb_promise(struct afs_vnode *vnode,
1828 enum afs_cb_promise_trace trace)
1829{
1830 trace_afs_cb_promise(vnode, trace);
1831 return atomic64_xchg(&vnode->cb_expires_at, AFS_NO_CB_PROMISE) != AFS_NO_CB_PROMISE;
1832}
1833
1834/*
1835 * Mark a directory as being invalid.
1836 */
1837static inline void afs_invalidate_dir(struct afs_vnode *dvnode,
1838 enum afs_dir_invalid_trace trace)
1839{
1840 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1841 trace_afs_dir_invalid(dvnode, trace);
1842 afs_stat_v(dvnode, n_inval);
1843 }
1844}
1845
1846/*****************************************************************************/
1847/*
1848 * debug tracing
1849 */
1850extern unsigned afs_debug;
1851
1852#define dbgprintk(FMT,...) \
1853 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1854
1855#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1856#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1857#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1858
1859
1860#if defined(__KDEBUG)
1861#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1862#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1863#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1864
1865#elif defined(CONFIG_AFS_DEBUG)
1866#define AFS_DEBUG_KENTER 0x01
1867#define AFS_DEBUG_KLEAVE 0x02
1868#define AFS_DEBUG_KDEBUG 0x04
1869
1870#define _enter(FMT,...) \
1871do { \
1872 if (unlikely(afs_debug & AFS_DEBUG_KENTER)) \
1873 kenter(FMT,##__VA_ARGS__); \
1874} while (0)
1875
1876#define _leave(FMT,...) \
1877do { \
1878 if (unlikely(afs_debug & AFS_DEBUG_KLEAVE)) \
1879 kleave(FMT,##__VA_ARGS__); \
1880} while (0)
1881
1882#define _debug(FMT,...) \
1883do { \
1884 if (unlikely(afs_debug & AFS_DEBUG_KDEBUG)) \
1885 kdebug(FMT,##__VA_ARGS__); \
1886} while (0)
1887
1888#else
1889#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1890#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1891#define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1892#endif
1893
1894/*
1895 * debug assertion checking
1896 */
1897#if 1 // defined(__KDEBUGALL)
1898
1899#define ASSERT(X) \
1900do { \
1901 if (unlikely(!(X))) { \
1902 printk(KERN_ERR "\n"); \
1903 printk(KERN_ERR "AFS: Assertion failed\n"); \
1904 BUG(); \
1905 } \
1906} while(0)
1907
1908#define ASSERTCMP(X, OP, Y) \
1909do { \
1910 if (unlikely(!((X) OP (Y)))) { \
1911 printk(KERN_ERR "\n"); \
1912 printk(KERN_ERR "AFS: Assertion failed\n"); \
1913 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1914 (unsigned long)(X), (unsigned long)(Y)); \
1915 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1916 (unsigned long)(X), (unsigned long)(Y)); \
1917 BUG(); \
1918 } \
1919} while(0)
1920
1921#define ASSERTRANGE(L, OP1, N, OP2, H) \
1922do { \
1923 if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
1924 printk(KERN_ERR "\n"); \
1925 printk(KERN_ERR "AFS: Assertion failed\n"); \
1926 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1927 (unsigned long)(L), (unsigned long)(N), \
1928 (unsigned long)(H)); \
1929 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1930 (unsigned long)(L), (unsigned long)(N), \
1931 (unsigned long)(H)); \
1932 BUG(); \
1933 } \
1934} while(0)
1935
1936#define ASSERTIF(C, X) \
1937do { \
1938 if (unlikely((C) && !(X))) { \
1939 printk(KERN_ERR "\n"); \
1940 printk(KERN_ERR "AFS: Assertion failed\n"); \
1941 BUG(); \
1942 } \
1943} while(0)
1944
1945#define ASSERTIFCMP(C, X, OP, Y) \
1946do { \
1947 if (unlikely((C) && !((X) OP (Y)))) { \
1948 printk(KERN_ERR "\n"); \
1949 printk(KERN_ERR "AFS: Assertion failed\n"); \
1950 printk(KERN_ERR "%lu " #OP " %lu is false\n", \
1951 (unsigned long)(X), (unsigned long)(Y)); \
1952 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
1953 (unsigned long)(X), (unsigned long)(Y)); \
1954 BUG(); \
1955 } \
1956} while(0)
1957
1958#else
1959
1960#define ASSERT(X) \
1961do { \
1962} while(0)
1963
1964#define ASSERTCMP(X, OP, Y) \
1965do { \
1966} while(0)
1967
1968#define ASSERTRANGE(L, OP1, N, OP2, H) \
1969do { \
1970} while(0)
1971
1972#define ASSERTIF(C, X) \
1973do { \
1974} while(0)
1975
1976#define ASSERTIFCMP(C, X, OP, Y) \
1977do { \
1978} while(0)
1979
1980#endif /* __KDEBUGALL */