1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* internal AFS stuff
3  *
4  * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
5  * Written by David Howells (dhowells@redhat.com)
6  */
7 
8 #include <linux/compiler.h>
9 #include <linux/kernel.h>
10 #include <linux/ktime.h>
11 #include <linux/fs.h>
12 #include <linux/pagemap.h>
13 #include <linux/rxrpc.h>
14 #include <linux/key.h>
15 #include <linux/workqueue.h>
16 #include <linux/sched.h>
17 #include <linux/fscache.h>
18 #include <linux/backing-dev.h>
19 #include <linux/uuid.h>
20 #include <linux/mm_types.h>
21 #include <linux/dns_resolver.h>
22 #include <net/net_namespace.h>
23 #include <net/netns/generic.h>
24 #include <net/sock.h>
25 #include <net/af_rxrpc.h>
26 
27 #include "afs.h"
28 #include "afs_vl.h"
29 
30 #define AFS_CELL_MAX_ADDRS 15
31 
32 struct pagevec;
33 struct afs_call;
34 struct afs_vnode;
35 
36 /*
37  * Partial file-locking emulation mode.  (The problem being that AFS3 only
38  * allows whole-file locks and no upgrading/downgrading).
39  */
40 enum afs_flock_mode {
41 	afs_flock_mode_unset,
42 	afs_flock_mode_local,	/* Local locking only */
43 	afs_flock_mode_openafs,	/* Don't get server lock for a partial lock */
44 	afs_flock_mode_strict,	/* Always get a server lock for a partial lock */
45 	afs_flock_mode_write,	/* Get an exclusive server lock for a partial lock */
46 };
47 
48 struct afs_fs_context {
49 	bool			force;		/* T to force cell type */
50 	bool			autocell;	/* T if set auto mount operation */
51 	bool			dyn_root;	/* T if dynamic root */
52 	bool			no_cell;	/* T if the source is "none" (for dynroot) */
53 	enum afs_flock_mode	flock_mode;	/* Partial file-locking emulation mode */
54 	afs_voltype_t		type;		/* type of volume requested */
55 	unsigned int		volnamesz;	/* size of volume name */
56 	const char		*volname;	/* name of volume to mount */
57 	struct afs_net		*net;		/* the AFS net namespace stuff */
58 	struct afs_cell		*cell;		/* cell in which to find volume */
59 	struct afs_volume	*volume;	/* volume record */
60 	struct key		*key;		/* key to use for secure mounting */
61 };
62 
63 enum afs_call_state {
64 	AFS_CALL_CL_REQUESTING,		/* Client: Request is being sent */
65 	AFS_CALL_CL_AWAIT_REPLY,	/* Client: Awaiting reply */
66 	AFS_CALL_CL_PROC_REPLY,		/* Client: rxrpc call complete; processing reply */
67 	AFS_CALL_SV_AWAIT_OP_ID,	/* Server: Awaiting op ID */
68 	AFS_CALL_SV_AWAIT_REQUEST,	/* Server: Awaiting request data */
69 	AFS_CALL_SV_REPLYING,		/* Server: Replying */
70 	AFS_CALL_SV_AWAIT_ACK,		/* Server: Awaiting final ACK */
71 	AFS_CALL_COMPLETE,		/* Completed or failed */
72 };
73 
74 /*
75  * List of server addresses.
76  */
77 struct afs_addr_list {
78 	struct rcu_head		rcu;
79 	refcount_t		usage;
80 	u32			version;	/* Version */
81 	unsigned char		max_addrs;
82 	unsigned char		nr_addrs;
83 	unsigned char		preferred;	/* Preferred address */
84 	unsigned char		nr_ipv4;	/* Number of IPv4 addresses */
85 	enum dns_record_source	source:8;
86 	enum dns_lookup_status	status:8;
87 	unsigned long		failed;		/* Mask of addrs that failed locally/ICMP */
88 	unsigned long		responded;	/* Mask of addrs that responded */
89 	struct sockaddr_rxrpc	addrs[];
90 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
91 };
92 
93 /*
94  * a record of an in-progress RxRPC call
95  */
96 struct afs_call {
97 	const struct afs_call_type *type;	/* type of call */
98 	struct afs_addr_list	*alist;		/* Address is alist[addr_ix] */
99 	wait_queue_head_t	waitq;		/* processes awaiting completion */
100 	struct work_struct	async_work;	/* async I/O processor */
101 	struct work_struct	work;		/* actual work processor */
102 	struct rxrpc_call	*rxcall;	/* RxRPC call handle */
103 	struct key		*key;		/* security for this call */
104 	struct afs_net		*net;		/* The network namespace */
105 	struct afs_server	*server;	/* The fileserver record if fs op (pins ref) */
106 	struct afs_vlserver	*vlserver;	/* The vlserver record if vl op */
107 	void			*request;	/* request data (first part) */
108 	size_t			iov_len;	/* Size of *iter to be used */
109 	struct iov_iter		def_iter;	/* Default buffer/data iterator */
110 	struct iov_iter		*write_iter;	/* Iterator defining write to be made */
111 	struct iov_iter		*iter;		/* Iterator currently in use */
112 	union {	/* Convenience for ->def_iter */
113 		struct kvec	kvec[1];
114 		struct bio_vec	bvec[1];
115 	};
116 	void			*buffer;	/* reply receive buffer */
117 	union {
118 		long			ret0;	/* Value to reply with instead of 0 */
119 		struct afs_addr_list	*ret_alist;
120 		struct afs_vldb_entry	*ret_vldb;
121 		char			*ret_str;
122 	};
123 	struct afs_operation	*op;
124 	unsigned int		server_index;
125 	atomic_t		usage;
126 	enum afs_call_state	state;
127 	spinlock_t		state_lock;
128 	int			error;		/* error code */
129 	u32			abort_code;	/* Remote abort ID or 0 */
130 	unsigned int		max_lifespan;	/* Maximum lifespan to set if not 0 */
131 	unsigned		request_size;	/* size of request data */
132 	unsigned		reply_max;	/* maximum size of reply */
133 	unsigned		count2;		/* count used in unmarshalling */
134 	unsigned char		unmarshall;	/* unmarshalling phase */
135 	unsigned char		addr_ix;	/* Address in ->alist */
136 	bool			drop_ref;	/* T if need to drop ref for incoming call */
137 	bool			need_attention;	/* T if RxRPC poked us */
138 	bool			async;		/* T if asynchronous */
139 	bool			upgrade;	/* T to request service upgrade */
140 	bool			intr;		/* T if interruptible */
141 	bool			unmarshalling_error; /* T if an unmarshalling error occurred */
142 	u16			service_id;	/* Actual service ID (after upgrade) */
143 	unsigned int		debug_id;	/* Trace ID */
144 	u32			operation_ID;	/* operation ID for an incoming call */
145 	u32			count;		/* count for use in unmarshalling */
146 	union {					/* place to extract temporary data */
147 		struct {
148 			__be32	tmp_u;
149 			__be32	tmp;
150 		} __attribute__((packed));
151 		__be64		tmp64;
152 	};
153 	ktime_t			issue_time;	/* Time of issue of operation */
154 };
155 
156 struct afs_call_type {
157 	const char *name;
158 	unsigned int op; /* Really enum afs_fs_operation */
159 
160 	/* deliver request or reply data to an call
161 	 * - returning an error will cause the call to be aborted
162 	 */
163 	int (*deliver)(struct afs_call *call);
164 
165 	/* clean up a call */
166 	void (*destructor)(struct afs_call *call);
167 
168 	/* Work function */
169 	void (*work)(struct work_struct *work);
170 
171 	/* Call done function (gets called immediately on success or failure) */
172 	void (*done)(struct afs_call *call);
173 };
174 
175 /*
176  * Key available for writeback on a file.
177  */
178 struct afs_wb_key {
179 	refcount_t		usage;
180 	struct key		*key;
181 	struct list_head	vnode_link;	/* Link in vnode->wb_keys */
182 };
183 
184 /*
185  * AFS open file information record.  Pointed to by file->private_data.
186  */
187 struct afs_file {
188 	struct key		*key;		/* The key this file was opened with */
189 	struct afs_wb_key	*wb;		/* Writeback key record for this file */
190 };
191 
afs_file_key(struct file * file)192 static inline struct key *afs_file_key(struct file *file)
193 {
194 	struct afs_file *af = file->private_data;
195 
196 	return af->key;
197 }
198 
199 /*
200  * Record of an outstanding read operation on a vnode.
201  */
202 struct afs_read {
203 	loff_t			pos;		/* Where to start reading */
204 	loff_t			len;		/* How much we're asking for */
205 	loff_t			actual_len;	/* How much we're actually getting */
206 	loff_t			file_size;	/* File size returned by server */
207 	struct key		*key;		/* The key to use to reissue the read */
208 	struct afs_vnode	*vnode;		/* The file being read into. */
209 	struct netfs_io_subrequest *subreq;	/* Fscache helper read request this belongs to */
210 	afs_dataversion_t	data_version;	/* Version number returned by server */
211 	refcount_t		usage;
212 	unsigned int		call_debug_id;
213 	unsigned int		nr_pages;
214 	int			error;
215 	void (*done)(struct afs_read *);
216 	void (*cleanup)(struct afs_read *);
217 	struct iov_iter		*iter;		/* Iterator representing the buffer */
218 	struct iov_iter		def_iter;	/* Default iterator */
219 };
220 
221 /*
222  * AFS superblock private data
223  * - there's one superblock per volume
224  */
225 struct afs_super_info {
226 	struct net		*net_ns;	/* Network namespace */
227 	struct afs_cell		*cell;		/* The cell in which the volume resides */
228 	struct afs_volume	*volume;	/* volume record */
229 	enum afs_flock_mode	flock_mode:8;	/* File locking emulation mode */
230 	bool			dyn_root;	/* True if dynamic root */
231 };
232 
AFS_FS_S(struct super_block * sb)233 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
234 {
235 	return sb->s_fs_info;
236 }
237 
238 extern struct file_system_type afs_fs_type;
239 
240 /*
241  * Set of substitutes for @sys.
242  */
243 struct afs_sysnames {
244 #define AFS_NR_SYSNAME 16
245 	char			*subs[AFS_NR_SYSNAME];
246 	refcount_t		usage;
247 	unsigned short		nr;
248 	char			blank[1];
249 };
250 
251 /*
252  * AFS network namespace record.
253  */
254 struct afs_net {
255 	struct net		*net;		/* Backpointer to the owning net namespace */
256 	struct afs_uuid		uuid;
257 	bool			live;		/* F if this namespace is being removed */
258 
259 	/* AF_RXRPC I/O stuff */
260 	struct socket		*socket;
261 	struct afs_call		*spare_incoming_call;
262 	struct work_struct	charge_preallocation_work;
263 	struct mutex		socket_mutex;
264 	atomic_t		nr_outstanding_calls;
265 	atomic_t		nr_superblocks;
266 
267 	/* Cell database */
268 	struct rb_root		cells;
269 	struct afs_cell		*ws_cell;
270 	struct work_struct	cells_manager;
271 	struct timer_list	cells_timer;
272 	atomic_t		cells_outstanding;
273 	struct rw_semaphore	cells_lock;
274 	struct mutex		cells_alias_lock;
275 
276 	struct mutex		proc_cells_lock;
277 	struct hlist_head	proc_cells;
278 
279 	/* Known servers.  Theoretically each fileserver can only be in one
280 	 * cell, but in practice, people create aliases and subsets and there's
281 	 * no easy way to distinguish them.
282 	 */
283 	seqlock_t		fs_lock;	/* For fs_servers, fs_probe_*, fs_proc */
284 	struct rb_root		fs_servers;	/* afs_server (by server UUID or address) */
285 	struct list_head	fs_probe_fast;	/* List of afs_server to probe at 30s intervals */
286 	struct list_head	fs_probe_slow;	/* List of afs_server to probe at 5m intervals */
287 	struct hlist_head	fs_proc;	/* procfs servers list */
288 
289 	struct hlist_head	fs_addresses4;	/* afs_server (by lowest IPv4 addr) */
290 	struct hlist_head	fs_addresses6;	/* afs_server (by lowest IPv6 addr) */
291 	seqlock_t		fs_addr_lock;	/* For fs_addresses[46] */
292 
293 	struct work_struct	fs_manager;
294 	struct timer_list	fs_timer;
295 
296 	struct work_struct	fs_prober;
297 	struct timer_list	fs_probe_timer;
298 	atomic_t		servers_outstanding;
299 
300 	/* File locking renewal management */
301 	struct mutex		lock_manager_mutex;
302 
303 	/* Misc */
304 	struct super_block	*dynroot_sb;	/* Dynamic root mount superblock */
305 	struct proc_dir_entry	*proc_afs;	/* /proc/net/afs directory */
306 	struct afs_sysnames	*sysnames;
307 	rwlock_t		sysnames_lock;
308 
309 	/* Statistics counters */
310 	atomic_t		n_lookup;	/* Number of lookups done */
311 	atomic_t		n_reval;	/* Number of dentries needing revalidation */
312 	atomic_t		n_inval;	/* Number of invalidations by the server */
313 	atomic_t		n_relpg;	/* Number of invalidations by release_folio */
314 	atomic_t		n_read_dir;	/* Number of directory pages read */
315 	atomic_t		n_dir_cr;	/* Number of directory entry creation edits */
316 	atomic_t		n_dir_rm;	/* Number of directory entry removal edits */
317 	atomic_t		n_stores;	/* Number of store ops */
318 	atomic_long_t		n_store_bytes;	/* Number of bytes stored */
319 	atomic_long_t		n_fetch_bytes;	/* Number of bytes fetched */
320 	atomic_t		n_fetches;	/* Number of data fetch ops */
321 };
322 
323 extern const char afs_init_sysname[];
324 
325 enum afs_cell_state {
326 	AFS_CELL_UNSET,
327 	AFS_CELL_ACTIVATING,
328 	AFS_CELL_ACTIVE,
329 	AFS_CELL_DEACTIVATING,
330 	AFS_CELL_INACTIVE,
331 	AFS_CELL_FAILED,
332 	AFS_CELL_REMOVED,
333 };
334 
335 /*
336  * AFS cell record.
337  *
338  * This is a tricky concept to get right as it is possible to create aliases
339  * simply by pointing AFSDB/SRV records for two names at the same set of VL
340  * servers; it is also possible to do things like setting up two sets of VL
341  * servers, one of which provides a superset of the volumes provided by the
342  * other (for internal/external division, for example).
343  *
344  * Cells only exist in the sense that (a) a cell's name maps to a set of VL
345  * servers and (b) a cell's name is used by the client to select the key to use
346  * for authentication and encryption.  The cell name is not typically used in
347  * the protocol.
348  *
349  * Two cells are determined to be aliases if they have an explicit alias (YFS
350  * only), share any VL servers in common or have at least one volume in common.
351  * "In common" means that the address list of the VL servers or the fileservers
352  * share at least one endpoint.
353  */
354 struct afs_cell {
355 	union {
356 		struct rcu_head	rcu;
357 		struct rb_node	net_node;	/* Node in net->cells */
358 	};
359 	struct afs_net		*net;
360 	struct afs_cell		*alias_of;	/* The cell this is an alias of */
361 	struct afs_volume	*root_volume;	/* The root.cell volume if there is one */
362 	struct key		*anonymous_key;	/* anonymous user key for this cell */
363 	struct work_struct	manager;	/* Manager for init/deinit/dns */
364 	struct hlist_node	proc_link;	/* /proc cell list link */
365 	time64_t		dns_expiry;	/* Time AFSDB/SRV record expires */
366 	time64_t		last_inactive;	/* Time of last drop of usage count */
367 	atomic_t		ref;		/* Struct refcount */
368 	atomic_t		active;		/* Active usage counter */
369 	unsigned long		flags;
370 #define AFS_CELL_FL_NO_GC	0		/* The cell was added manually, don't auto-gc */
371 #define AFS_CELL_FL_DO_LOOKUP	1		/* DNS lookup requested */
372 #define AFS_CELL_FL_CHECK_ALIAS	2		/* Need to check for aliases */
373 	enum afs_cell_state	state;
374 	short			error;
375 	enum dns_record_source	dns_source:8;	/* Latest source of data from lookup */
376 	enum dns_lookup_status	dns_status:8;	/* Latest status of data from lookup */
377 	unsigned int		dns_lookup_count; /* Counter of DNS lookups */
378 	unsigned int		debug_id;
379 
380 	/* The volumes belonging to this cell */
381 	struct rb_root		volumes;	/* Tree of volumes on this server */
382 	struct hlist_head	proc_volumes;	/* procfs volume list */
383 	seqlock_t		volume_lock;	/* For volumes */
384 
385 	/* Active fileserver interaction state. */
386 	struct rb_root		fs_servers;	/* afs_server (by server UUID) */
387 	seqlock_t		fs_lock;	/* For fs_servers  */
388 	struct rw_semaphore	fs_open_mmaps_lock;
389 	struct list_head	fs_open_mmaps;	/* List of vnodes that are mmapped */
390 	atomic_t		fs_s_break;	/* Counter of CB.InitCallBackState messages */
391 
392 	/* VL server list. */
393 	rwlock_t		vl_servers_lock; /* Lock on vl_servers */
394 	struct afs_vlserver_list __rcu *vl_servers;
395 
396 	u8			name_len;	/* Length of name */
397 	char			*name;		/* Cell name, case-flattened and NUL-padded */
398 };
399 
400 /*
401  * Volume Location server record.
402  */
403 struct afs_vlserver {
404 	struct rcu_head		rcu;
405 	struct afs_addr_list	__rcu *addresses; /* List of addresses for this VL server */
406 	unsigned long		flags;
407 #define AFS_VLSERVER_FL_PROBED	0		/* The VL server has been probed */
408 #define AFS_VLSERVER_FL_PROBING	1		/* VL server is being probed */
409 #define AFS_VLSERVER_FL_IS_YFS	2		/* Server is YFS not AFS */
410 #define AFS_VLSERVER_FL_RESPONDING 3		/* VL server is responding */
411 	rwlock_t		lock;		/* Lock on addresses */
412 	atomic_t		usage;
413 	unsigned int		rtt;		/* Server's current RTT in uS */
414 
415 	/* Probe state */
416 	wait_queue_head_t	probe_wq;
417 	atomic_t		probe_outstanding;
418 	spinlock_t		probe_lock;
419 	struct {
420 		unsigned int	rtt;		/* RTT in uS */
421 		u32		abort_code;
422 		short		error;
423 		unsigned short	flags;
424 #define AFS_VLSERVER_PROBE_RESPONDED		0x01 /* At least once response (may be abort) */
425 #define AFS_VLSERVER_PROBE_IS_YFS		0x02 /* The peer appears to be YFS */
426 #define AFS_VLSERVER_PROBE_NOT_YFS		0x04 /* The peer appears not to be YFS */
427 #define AFS_VLSERVER_PROBE_LOCAL_FAILURE	0x08 /* A local failure prevented a probe */
428 	} probe;
429 
430 	u16			port;
431 	u16			name_len;	/* Length of name */
432 	char			name[];		/* Server name, case-flattened */
433 };
434 
435 /*
436  * Weighted list of Volume Location servers.
437  */
438 struct afs_vlserver_entry {
439 	u16			priority;	/* Preference (as SRV) */
440 	u16			weight;		/* Weight (as SRV) */
441 	enum dns_record_source	source:8;
442 	enum dns_lookup_status	status:8;
443 	struct afs_vlserver	*server;
444 };
445 
446 struct afs_vlserver_list {
447 	struct rcu_head		rcu;
448 	atomic_t		usage;
449 	u8			nr_servers;
450 	u8			index;		/* Server currently in use */
451 	u8			preferred;	/* Preferred server */
452 	enum dns_record_source	source:8;
453 	enum dns_lookup_status	status:8;
454 	rwlock_t		lock;
455 	struct afs_vlserver_entry servers[];
456 };
457 
458 /*
459  * Cached VLDB entry.
460  *
461  * This is pointed to by cell->vldb_entries, indexed by name.
462  */
463 struct afs_vldb_entry {
464 	afs_volid_t		vid[3];		/* Volume IDs for R/W, R/O and Bak volumes */
465 
466 	unsigned long		flags;
467 #define AFS_VLDB_HAS_RW		0		/* - R/W volume exists */
468 #define AFS_VLDB_HAS_RO		1		/* - R/O volume exists */
469 #define AFS_VLDB_HAS_BAK	2		/* - Backup volume exists */
470 #define AFS_VLDB_QUERY_VALID	3		/* - Record is valid */
471 #define AFS_VLDB_QUERY_ERROR	4		/* - VL server returned error */
472 
473 	uuid_t			fs_server[AFS_NMAXNSERVERS];
474 	u32			addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
475 	u8			fs_mask[AFS_NMAXNSERVERS];
476 #define AFS_VOL_VTM_RW	0x01 /* R/W version of the volume is available (on this server) */
477 #define AFS_VOL_VTM_RO	0x02 /* R/O version of the volume is available (on this server) */
478 #define AFS_VOL_VTM_BAK	0x04 /* backup version of the volume is available (on this server) */
479 	short			error;
480 	u8			nr_servers;	/* Number of server records */
481 	u8			name_len;
482 	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
483 };
484 
485 /*
486  * Record of fileserver with which we're actively communicating.
487  */
488 struct afs_server {
489 	struct rcu_head		rcu;
490 	union {
491 		uuid_t		uuid;		/* Server ID */
492 		struct afs_uuid	_uuid;
493 	};
494 
495 	struct afs_addr_list	__rcu *addresses;
496 	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
497 	struct rb_node		uuid_rb;	/* Link in net->fs_servers */
498 	struct afs_server __rcu	*uuid_next;	/* Next server with same UUID */
499 	struct afs_server	*uuid_prev;	/* Previous server with same UUID */
500 	struct list_head	probe_link;	/* Link in net->fs_probe_list */
501 	struct hlist_node	addr4_link;	/* Link in net->fs_addresses4 */
502 	struct hlist_node	addr6_link;	/* Link in net->fs_addresses6 */
503 	struct hlist_node	proc_link;	/* Link in net->fs_proc */
504 	struct work_struct	initcb_work;	/* Work for CB.InitCallBackState* */
505 	struct afs_server	*gc_next;	/* Next server in manager's list */
506 	time64_t		unuse_time;	/* Time at which last unused */
507 	unsigned long		flags;
508 #define AFS_SERVER_FL_RESPONDING 0		/* The server is responding */
509 #define AFS_SERVER_FL_UPDATING	1
510 #define AFS_SERVER_FL_NEEDS_UPDATE 2		/* Fileserver address list is out of date */
511 #define AFS_SERVER_FL_NOT_READY	4		/* The record is not ready for use */
512 #define AFS_SERVER_FL_NOT_FOUND	5		/* VL server says no such server */
513 #define AFS_SERVER_FL_VL_FAIL	6		/* Failed to access VL server */
514 #define AFS_SERVER_FL_MAY_HAVE_CB 8		/* May have callbacks on this fileserver */
515 #define AFS_SERVER_FL_IS_YFS	16		/* Server is YFS not AFS */
516 #define AFS_SERVER_FL_NO_IBULK	17		/* Fileserver doesn't support FS.InlineBulkStatus */
517 #define AFS_SERVER_FL_NO_RM2	18		/* Fileserver doesn't support YFS.RemoveFile2 */
518 #define AFS_SERVER_FL_HAS_FS64	19		/* Fileserver supports FS.{Fetch,Store}Data64 */
519 	atomic_t		ref;		/* Object refcount */
520 	atomic_t		active;		/* Active user count */
521 	u32			addr_version;	/* Address list version */
522 	unsigned int		rtt;		/* Server's current RTT in uS */
523 	unsigned int		debug_id;	/* Debugging ID for traces */
524 
525 	/* file service access */
526 	rwlock_t		fs_lock;	/* access lock */
527 
528 	/* callback promise management */
529 	unsigned		cb_s_break;	/* Break-everything counter. */
530 
531 	/* Probe state */
532 	unsigned long		probed_at;	/* Time last probe was dispatched (jiffies) */
533 	wait_queue_head_t	probe_wq;
534 	atomic_t		probe_outstanding;
535 	spinlock_t		probe_lock;
536 	struct {
537 		unsigned int	rtt;		/* RTT in uS */
538 		u32		abort_code;
539 		short		error;
540 		bool		responded:1;
541 		bool		is_yfs:1;
542 		bool		not_yfs:1;
543 		bool		local_failure:1;
544 	} probe;
545 };
546 
547 /*
548  * Replaceable volume server list.
549  */
550 struct afs_server_entry {
551 	struct afs_server	*server;
552 };
553 
554 struct afs_server_list {
555 	afs_volid_t		vids[AFS_MAXTYPES]; /* Volume IDs */
556 	refcount_t		usage;
557 	unsigned char		nr_servers;
558 	unsigned char		preferred;	/* Preferred server */
559 	unsigned short		vnovol_mask;	/* Servers to be skipped due to VNOVOL */
560 	unsigned int		seq;		/* Set to ->servers_seq when installed */
561 	rwlock_t		lock;
562 	struct afs_server_entry	servers[];
563 };
564 
565 /*
566  * Live AFS volume management.
567  */
568 struct afs_volume {
569 	union {
570 		struct rcu_head	rcu;
571 		afs_volid_t	vid;		/* volume ID */
572 	};
573 	atomic_t		usage;
574 	time64_t		update_at;	/* Time at which to next update */
575 	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
576 	struct rb_node		cell_node;	/* Link in cell->volumes */
577 	struct hlist_node	proc_link;	/* Link in cell->proc_volumes */
578 	struct super_block __rcu *sb;		/* Superblock on which inodes reside */
579 	unsigned long		flags;
580 #define AFS_VOLUME_NEEDS_UPDATE	0	/* - T if an update needs performing */
581 #define AFS_VOLUME_UPDATING	1	/* - T if an update is in progress */
582 #define AFS_VOLUME_WAIT		2	/* - T if users must wait for update */
583 #define AFS_VOLUME_DELETED	3	/* - T if volume appears deleted */
584 #define AFS_VOLUME_OFFLINE	4	/* - T if volume offline notice given */
585 #define AFS_VOLUME_BUSY		5	/* - T if volume busy notice given */
586 #define AFS_VOLUME_MAYBE_NO_IBULK 6	/* - T if some servers don't have InlineBulkStatus */
587 #ifdef CONFIG_AFS_FSCACHE
588 	struct fscache_volume	*cache;		/* Caching cookie */
589 #endif
590 	struct afs_server_list __rcu *servers;	/* List of servers on which volume resides */
591 	rwlock_t		servers_lock;	/* Lock for ->servers */
592 	unsigned int		servers_seq;	/* Incremented each time ->servers changes */
593 
594 	unsigned		cb_v_break;	/* Break-everything counter. */
595 	rwlock_t		cb_v_break_lock;
596 
597 	afs_voltype_t		type;		/* type of volume */
598 	char			type_force;	/* force volume type (suppress R/O -> R/W) */
599 	u8			name_len;
600 	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
601 };
602 
603 enum afs_lock_state {
604 	AFS_VNODE_LOCK_NONE,		/* The vnode has no lock on the server */
605 	AFS_VNODE_LOCK_WAITING_FOR_CB,	/* We're waiting for the server to break the callback */
606 	AFS_VNODE_LOCK_SETTING,		/* We're asking the server for a lock */
607 	AFS_VNODE_LOCK_GRANTED,		/* We have a lock on the server */
608 	AFS_VNODE_LOCK_EXTENDING,	/* We're extending a lock on the server */
609 	AFS_VNODE_LOCK_NEED_UNLOCK,	/* We need to unlock on the server */
610 	AFS_VNODE_LOCK_UNLOCKING,	/* We're telling the server to unlock */
611 	AFS_VNODE_LOCK_DELETED,		/* The vnode has been deleted whilst we have a lock */
612 };
613 
614 /*
615  * AFS inode private data.
616  *
617  * Note that afs_alloc_inode() *must* reset anything that could incorrectly
618  * leak from one inode to another.
619  */
620 struct afs_vnode {
621 	struct netfs_inode	netfs;		/* Netfslib context and vfs inode */
622 	struct afs_volume	*volume;	/* volume on which vnode resides */
623 	struct afs_fid		fid;		/* the file identifier for this inode */
624 	struct afs_file_status	status;		/* AFS status info for this file */
625 	afs_dataversion_t	invalid_before;	/* Child dentries are invalid before this */
626 	struct afs_permits __rcu *permit_cache;	/* cache of permits so far obtained */
627 	struct mutex		io_lock;	/* Lock for serialising I/O on this mutex */
628 	struct rw_semaphore	validate_lock;	/* lock for validating this vnode */
629 	struct rw_semaphore	rmdir_lock;	/* Lock for rmdir vs sillyrename */
630 	struct key		*silly_key;	/* Silly rename key */
631 	spinlock_t		wb_lock;	/* lock for wb_keys */
632 	spinlock_t		lock;		/* waitqueue/flags lock */
633 	unsigned long		flags;
634 #define AFS_VNODE_CB_PROMISED	0		/* Set if vnode has a callback promise */
635 #define AFS_VNODE_UNSET		1		/* set if vnode attributes not yet set */
636 #define AFS_VNODE_DIR_VALID	2		/* Set if dir contents are valid */
637 #define AFS_VNODE_ZAP_DATA	3		/* set if vnode's data should be invalidated */
638 #define AFS_VNODE_DELETED	4		/* set if vnode deleted on server */
639 #define AFS_VNODE_MOUNTPOINT	5		/* set if vnode is a mountpoint symlink */
640 #define AFS_VNODE_AUTOCELL	6		/* set if Vnode is an auto mount point */
641 #define AFS_VNODE_PSEUDODIR	7 		/* set if Vnode is a pseudo directory */
642 #define AFS_VNODE_NEW_CONTENT	8		/* Set if file has new content (create/trunc-0) */
643 #define AFS_VNODE_SILLY_DELETED	9		/* Set if file has been silly-deleted */
644 #define AFS_VNODE_MODIFYING	10		/* Set if we're performing a modification op */
645 
646 	struct list_head	wb_keys;	/* List of keys available for writeback */
647 	struct list_head	pending_locks;	/* locks waiting to be granted */
648 	struct list_head	granted_locks;	/* locks granted on this file */
649 	struct delayed_work	lock_work;	/* work to be done in locking */
650 	struct key		*lock_key;	/* Key to be used in lock ops */
651 	ktime_t			locked_at;	/* Time at which lock obtained */
652 	enum afs_lock_state	lock_state : 8;
653 	afs_lock_type_t		lock_type : 8;
654 
655 	/* outstanding callback notification on this file */
656 	struct work_struct	cb_work;	/* Work for mmap'd files */
657 	struct list_head	cb_mmap_link;	/* Link in cell->fs_open_mmaps */
658 	void			*cb_server;	/* Server with callback/filelock */
659 	atomic_t		cb_nr_mmap;	/* Number of mmaps */
660 	unsigned int		cb_fs_s_break;	/* Mass server break counter (cell->fs_s_break) */
661 	unsigned int		cb_s_break;	/* Mass break counter on ->server */
662 	unsigned int		cb_v_break;	/* Mass break counter on ->volume */
663 	unsigned int		cb_break;	/* Break counter on vnode */
664 	seqlock_t		cb_lock;	/* Lock for ->cb_server, ->status, ->cb_*break */
665 
666 	time64_t		cb_expires_at;	/* time at which callback expires */
667 };
668 
afs_vnode_cache(struct afs_vnode * vnode)669 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
670 {
671 #ifdef CONFIG_AFS_FSCACHE
672 	return netfs_i_cookie(&vnode->netfs);
673 #else
674 	return NULL;
675 #endif
676 }
677 
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)678 static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
679 				       struct fscache_cookie *cookie)
680 {
681 #ifdef CONFIG_AFS_FSCACHE
682 	vnode->netfs.cache = cookie;
683 #endif
684 }
685 
686 /*
687  * cached security record for one user's attempt to access a vnode
688  */
689 struct afs_permit {
690 	struct key		*key;		/* RxRPC ticket holding a security context */
691 	afs_access_t		access;		/* CallerAccess value for this key */
692 };
693 
694 /*
695  * Immutable cache of CallerAccess records from attempts to access vnodes.
696  * These may be shared between multiple vnodes.
697  */
698 struct afs_permits {
699 	struct rcu_head		rcu;
700 	struct hlist_node	hash_node;	/* Link in hash */
701 	unsigned long		h;		/* Hash value for this permit list */
702 	refcount_t		usage;
703 	unsigned short		nr_permits;	/* Number of records */
704 	bool			invalidated;	/* Invalidated due to key change */
705 	struct afs_permit	permits[];	/* List of permits sorted by key pointer */
706 };
707 
708 /*
709  * Error prioritisation and accumulation.
710  */
711 struct afs_error {
712 	short	error;			/* Accumulated error */
713 	bool	responded;		/* T if server responded */
714 };
715 
716 /*
717  * Cursor for iterating over a server's address list.
718  */
719 struct afs_addr_cursor {
720 	struct afs_addr_list	*alist;		/* Current address list (pins ref) */
721 	unsigned long		tried;		/* Tried addresses */
722 	signed char		index;		/* Current address */
723 	bool			responded;	/* T if the current address responded */
724 	unsigned short		nr_iterations;	/* Number of address iterations */
725 	short			error;
726 	u32			abort_code;
727 };
728 
729 /*
730  * Cursor for iterating over a set of volume location servers.
731  */
732 struct afs_vl_cursor {
733 	struct afs_addr_cursor	ac;
734 	struct afs_cell		*cell;		/* The cell we're querying */
735 	struct afs_vlserver_list *server_list;	/* Current server list (pins ref) */
736 	struct afs_vlserver	*server;	/* Server on which this resides */
737 	struct key		*key;		/* Key for the server */
738 	unsigned long		untried;	/* Bitmask of untried servers */
739 	short			index;		/* Current server */
740 	short			error;
741 	unsigned short		flags;
742 #define AFS_VL_CURSOR_STOP	0x0001		/* Set to cease iteration */
743 #define AFS_VL_CURSOR_RETRY	0x0002		/* Set to do a retry */
744 #define AFS_VL_CURSOR_RETRIED	0x0004		/* Set if started a retry */
745 	unsigned short		nr_iterations;	/* Number of server iterations */
746 };
747 
748 /*
749  * Fileserver operation methods.
750  */
751 struct afs_operation_ops {
752 	void (*issue_afs_rpc)(struct afs_operation *op);
753 	void (*issue_yfs_rpc)(struct afs_operation *op);
754 	void (*success)(struct afs_operation *op);
755 	void (*aborted)(struct afs_operation *op);
756 	void (*failed)(struct afs_operation *op);
757 	void (*edit_dir)(struct afs_operation *op);
758 	void (*put)(struct afs_operation *op);
759 };
760 
761 struct afs_vnode_param {
762 	struct afs_vnode	*vnode;
763 	struct afs_fid		fid;		/* Fid to access */
764 	struct afs_status_cb	scb;		/* Returned status and callback promise */
765 	afs_dataversion_t	dv_before;	/* Data version before the call */
766 	unsigned int		cb_break_before; /* cb_break + cb_s_break before the call */
767 	u8			dv_delta;	/* Expected change in data version */
768 	bool			put_vnode:1;	/* T if we have a ref on the vnode */
769 	bool			need_io_lock:1;	/* T if we need the I/O lock on this */
770 	bool			update_ctime:1;	/* Need to update the ctime */
771 	bool			set_size:1;	/* Must update i_size */
772 	bool			op_unlinked:1;	/* True if file was unlinked by op */
773 	bool			speculative:1;	/* T if speculative status fetch (no vnode lock) */
774 	bool			modification:1;	/* Set if the content gets modified */
775 };
776 
777 /*
778  * Fileserver operation wrapper, handling server and address rotation
779  * asynchronously.  May make simultaneous calls to multiple servers.
780  */
781 struct afs_operation {
782 	struct afs_net		*net;		/* Network namespace */
783 	struct key		*key;		/* Key for the cell */
784 	const struct afs_call_type *type;	/* Type of call done */
785 	const struct afs_operation_ops *ops;
786 
787 	/* Parameters/results for the operation */
788 	struct afs_volume	*volume;	/* Volume being accessed */
789 	struct afs_vnode_param	file[2];
790 	struct afs_vnode_param	*more_files;
791 	struct afs_volsync	volsync;
792 	struct dentry		*dentry;	/* Dentry to be altered */
793 	struct dentry		*dentry_2;	/* Second dentry to be altered */
794 	struct timespec64	mtime;		/* Modification time to record */
795 	struct timespec64	ctime;		/* Change time to set */
796 	short			nr_files;	/* Number of entries in file[], more_files */
797 	short			error;
798 	unsigned int		debug_id;
799 
800 	unsigned int		cb_v_break;	/* Volume break counter before op */
801 	unsigned int		cb_s_break;	/* Server break counter before op */
802 
803 	union {
804 		struct {
805 			int	which;		/* Which ->file[] to fetch for */
806 		} fetch_status;
807 		struct {
808 			int	reason;		/* enum afs_edit_dir_reason */
809 			mode_t	mode;
810 			const char *symlink;
811 		} create;
812 		struct {
813 			bool	need_rehash;
814 		} unlink;
815 		struct {
816 			struct dentry *rehash;
817 			struct dentry *tmp;
818 			bool	new_negative;
819 		} rename;
820 		struct {
821 			struct afs_read *req;
822 		} fetch;
823 		struct {
824 			afs_lock_type_t type;
825 		} lock;
826 		struct {
827 			struct iov_iter	*write_iter;
828 			loff_t	pos;
829 			loff_t	size;
830 			loff_t	i_size;
831 			bool	laundering;	/* Laundering page, PG_writeback not set */
832 		} store;
833 		struct {
834 			struct iattr	*attr;
835 			loff_t		old_i_size;
836 		} setattr;
837 		struct afs_acl	*acl;
838 		struct yfs_acl	*yacl;
839 		struct {
840 			struct afs_volume_status vs;
841 			struct kstatfs		*buf;
842 		} volstatus;
843 	};
844 
845 	/* Fileserver iteration state */
846 	struct afs_addr_cursor	ac;
847 	struct afs_server_list	*server_list;	/* Current server list (pins ref) */
848 	struct afs_server	*server;	/* Server we're using (ref pinned by server_list) */
849 	struct afs_call		*call;
850 	unsigned long		untried;	/* Bitmask of untried servers */
851 	short			index;		/* Current server */
852 	unsigned short		nr_iterations;	/* Number of server iterations */
853 
854 	unsigned int		flags;
855 #define AFS_OPERATION_STOP		0x0001	/* Set to cease iteration */
856 #define AFS_OPERATION_VBUSY		0x0002	/* Set if seen VBUSY */
857 #define AFS_OPERATION_VMOVED		0x0004	/* Set if seen VMOVED */
858 #define AFS_OPERATION_VNOVOL		0x0008	/* Set if seen VNOVOL */
859 #define AFS_OPERATION_CUR_ONLY		0x0010	/* Set if current server only (file lock held) */
860 #define AFS_OPERATION_NO_VSLEEP		0x0020	/* Set to prevent sleep on VBUSY, VOFFLINE, ... */
861 #define AFS_OPERATION_UNINTR		0x0040	/* Set if op is uninterruptible */
862 #define AFS_OPERATION_DOWNGRADE		0x0080	/* Set to retry with downgraded opcode */
863 #define AFS_OPERATION_LOCK_0		0x0100	/* Set if have io_lock on file[0] */
864 #define AFS_OPERATION_LOCK_1		0x0200	/* Set if have io_lock on file[1] */
865 #define AFS_OPERATION_TRIED_ALL		0x0400	/* Set if we've tried all the fileservers */
866 #define AFS_OPERATION_RETRY_SERVER	0x0800	/* Set if we should retry the current server */
867 #define AFS_OPERATION_DIR_CONFLICT	0x1000	/* Set if we detected a 3rd-party dir change */
868 };
869 
870 /*
871  * Cache auxiliary data.
872  */
873 struct afs_vnode_cache_aux {
874 	__be64			data_version;
875 } __packed;
876 
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)877 static inline void afs_set_cache_aux(struct afs_vnode *vnode,
878 				     struct afs_vnode_cache_aux *aux)
879 {
880 	aux->data_version = cpu_to_be64(vnode->status.data_version);
881 }
882 
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)883 static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
884 {
885 	struct afs_vnode_cache_aux aux;
886 
887 	afs_set_cache_aux(vnode, &aux);
888 	fscache_invalidate(afs_vnode_cache(vnode), &aux,
889 			   i_size_read(&vnode->netfs.inode), flags);
890 }
891 
892 /*
893  * We use folio->private to hold the amount of the folio that we've written to,
894  * splitting the field into two parts.  However, we need to represent a range
895  * 0...FOLIO_SIZE, so we reduce the resolution if the size of the folio
896  * exceeds what we can encode.
897  */
898 #ifdef CONFIG_64BIT
899 #define __AFS_FOLIO_PRIV_MASK		0x7fffffffUL
900 #define __AFS_FOLIO_PRIV_SHIFT		32
901 #define __AFS_FOLIO_PRIV_MMAPPED	0x80000000UL
902 #else
903 #define __AFS_FOLIO_PRIV_MASK		0x7fffUL
904 #define __AFS_FOLIO_PRIV_SHIFT		16
905 #define __AFS_FOLIO_PRIV_MMAPPED	0x8000UL
906 #endif
907 
afs_folio_dirty_resolution(struct folio * folio)908 static inline unsigned int afs_folio_dirty_resolution(struct folio *folio)
909 {
910 	int shift = folio_shift(folio) - (__AFS_FOLIO_PRIV_SHIFT - 1);
911 	return (shift > 0) ? shift : 0;
912 }
913 
afs_folio_dirty_from(struct folio * folio,unsigned long priv)914 static inline size_t afs_folio_dirty_from(struct folio *folio, unsigned long priv)
915 {
916 	unsigned long x = priv & __AFS_FOLIO_PRIV_MASK;
917 
918 	/* The lower bound is inclusive */
919 	return x << afs_folio_dirty_resolution(folio);
920 }
921 
afs_folio_dirty_to(struct folio * folio,unsigned long priv)922 static inline size_t afs_folio_dirty_to(struct folio *folio, unsigned long priv)
923 {
924 	unsigned long x = (priv >> __AFS_FOLIO_PRIV_SHIFT) & __AFS_FOLIO_PRIV_MASK;
925 
926 	/* The upper bound is immediately beyond the region */
927 	return (x + 1) << afs_folio_dirty_resolution(folio);
928 }
929 
afs_folio_dirty(struct folio * folio,size_t from,size_t to)930 static inline unsigned long afs_folio_dirty(struct folio *folio, size_t from, size_t to)
931 {
932 	unsigned int res = afs_folio_dirty_resolution(folio);
933 	from >>= res;
934 	to = (to - 1) >> res;
935 	return (to << __AFS_FOLIO_PRIV_SHIFT) | from;
936 }
937 
afs_folio_dirty_mmapped(unsigned long priv)938 static inline unsigned long afs_folio_dirty_mmapped(unsigned long priv)
939 {
940 	return priv | __AFS_FOLIO_PRIV_MMAPPED;
941 }
942 
afs_is_folio_dirty_mmapped(unsigned long priv)943 static inline bool afs_is_folio_dirty_mmapped(unsigned long priv)
944 {
945 	return priv & __AFS_FOLIO_PRIV_MMAPPED;
946 }
947 
948 #include <trace/events/afs.h>
949 
950 /*****************************************************************************/
951 /*
952  * addr_list.c
953  */
afs_get_addrlist(struct afs_addr_list * alist)954 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
955 {
956 	if (alist)
957 		refcount_inc(&alist->usage);
958 	return alist;
959 }
960 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
961 						unsigned short,
962 						unsigned short);
963 extern void afs_put_addrlist(struct afs_addr_list *);
964 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
965 						      const char *, size_t, char,
966 						      unsigned short, unsigned short);
967 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
968 extern bool afs_iterate_addresses(struct afs_addr_cursor *);
969 extern int afs_end_cursor(struct afs_addr_cursor *);
970 
971 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
972 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
973 
974 /*
975  * cache.c
976  */
977 #ifdef CONFIG_AFS_FSCACHE
978 extern struct fscache_netfs afs_cache_netfs;
979 #endif
980 
981 /*
982  * callback.c
983  */
984 extern void afs_invalidate_mmap_work(struct work_struct *);
985 extern void afs_server_init_callback_work(struct work_struct *work);
986 extern void afs_init_callback_state(struct afs_server *);
987 extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
988 extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
989 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
990 
afs_calc_vnode_cb_break(struct afs_vnode * vnode)991 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
992 {
993 	return vnode->cb_break + vnode->cb_v_break;
994 }
995 
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)996 static inline bool afs_cb_is_broken(unsigned int cb_break,
997 				    const struct afs_vnode *vnode)
998 {
999 	return cb_break != (vnode->cb_break + vnode->volume->cb_v_break);
1000 }
1001 
1002 /*
1003  * cell.c
1004  */
1005 extern int afs_cell_init(struct afs_net *, const char *);
1006 extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1007 				      enum afs_cell_trace);
1008 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1009 					const char *, bool);
1010 extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1011 extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1012 extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1013 extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1014 extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1015 extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1016 extern void afs_manage_cells(struct work_struct *);
1017 extern void afs_cells_timer(struct timer_list *);
1018 extern void __net_exit afs_cell_purge(struct afs_net *);
1019 
1020 /*
1021  * cmservice.c
1022  */
1023 extern bool afs_cm_incoming_call(struct afs_call *);
1024 
1025 /*
1026  * dir.c
1027  */
1028 extern const struct file_operations afs_dir_file_operations;
1029 extern const struct inode_operations afs_dir_inode_operations;
1030 extern const struct address_space_operations afs_dir_aops;
1031 extern const struct dentry_operations afs_fs_dentry_operations;
1032 
1033 extern void afs_d_release(struct dentry *);
1034 extern void afs_check_for_remote_deletion(struct afs_operation *);
1035 
1036 /*
1037  * dir_edit.c
1038  */
1039 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1040 			     enum afs_edit_dir_reason);
1041 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1042 
1043 /*
1044  * dir_silly.c
1045  */
1046 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1047 			   struct dentry *, struct key *);
1048 extern int afs_silly_iput(struct dentry *, struct inode *);
1049 
1050 /*
1051  * dynroot.c
1052  */
1053 extern const struct inode_operations afs_dynroot_inode_operations;
1054 extern const struct dentry_operations afs_dynroot_dentry_operations;
1055 
1056 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1057 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1058 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1059 extern int afs_dynroot_populate(struct super_block *);
1060 extern void afs_dynroot_depopulate(struct super_block *);
1061 
1062 /*
1063  * file.c
1064  */
1065 extern const struct address_space_operations afs_file_aops;
1066 extern const struct address_space_operations afs_symlink_aops;
1067 extern const struct inode_operations afs_file_inode_operations;
1068 extern const struct file_operations afs_file_operations;
1069 extern const struct netfs_request_ops afs_req_ops;
1070 
1071 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1072 extern void afs_put_wb_key(struct afs_wb_key *);
1073 extern int afs_open(struct inode *, struct file *);
1074 extern int afs_release(struct inode *, struct file *);
1075 extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
1076 extern struct afs_read *afs_alloc_read(gfp_t);
1077 extern void afs_put_read(struct afs_read *);
1078 extern int afs_write_inode(struct inode *, struct writeback_control *);
1079 
afs_get_read(struct afs_read * req)1080 static inline struct afs_read *afs_get_read(struct afs_read *req)
1081 {
1082 	refcount_inc(&req->usage);
1083 	return req;
1084 }
1085 
1086 /*
1087  * flock.c
1088  */
1089 extern struct workqueue_struct *afs_lock_manager;
1090 
1091 extern void afs_lock_op_done(struct afs_call *);
1092 extern void afs_lock_work(struct work_struct *);
1093 extern void afs_lock_may_be_available(struct afs_vnode *);
1094 extern int afs_lock(struct file *, int, struct file_lock *);
1095 extern int afs_flock(struct file *, int, struct file_lock *);
1096 
1097 /*
1098  * fsclient.c
1099  */
1100 extern void afs_fs_fetch_status(struct afs_operation *);
1101 extern void afs_fs_fetch_data(struct afs_operation *);
1102 extern void afs_fs_create_file(struct afs_operation *);
1103 extern void afs_fs_make_dir(struct afs_operation *);
1104 extern void afs_fs_remove_file(struct afs_operation *);
1105 extern void afs_fs_remove_dir(struct afs_operation *);
1106 extern void afs_fs_link(struct afs_operation *);
1107 extern void afs_fs_symlink(struct afs_operation *);
1108 extern void afs_fs_rename(struct afs_operation *);
1109 extern void afs_fs_store_data(struct afs_operation *);
1110 extern void afs_fs_setattr(struct afs_operation *);
1111 extern void afs_fs_get_volume_status(struct afs_operation *);
1112 extern void afs_fs_set_lock(struct afs_operation *);
1113 extern void afs_fs_extend_lock(struct afs_operation *);
1114 extern void afs_fs_release_lock(struct afs_operation *);
1115 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
1116 					struct afs_addr_cursor *, struct key *);
1117 extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
1118 				    struct afs_addr_cursor *, struct key *);
1119 extern void afs_fs_inline_bulk_status(struct afs_operation *);
1120 
1121 struct afs_acl {
1122 	u32	size;
1123 	u8	data[];
1124 };
1125 
1126 extern void afs_fs_fetch_acl(struct afs_operation *);
1127 extern void afs_fs_store_acl(struct afs_operation *);
1128 
1129 /*
1130  * fs_operation.c
1131  */
1132 extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1133 extern int afs_put_operation(struct afs_operation *);
1134 extern bool afs_begin_vnode_operation(struct afs_operation *);
1135 extern void afs_wait_for_operation(struct afs_operation *);
1136 extern int afs_do_sync_operation(struct afs_operation *);
1137 
afs_op_nomem(struct afs_operation * op)1138 static inline void afs_op_nomem(struct afs_operation *op)
1139 {
1140 	op->error = -ENOMEM;
1141 }
1142 
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1143 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1144 				    struct afs_vnode *vnode)
1145 {
1146 	op->file[n].vnode = vnode;
1147 	op->file[n].need_io_lock = true;
1148 }
1149 
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1150 static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1151 				  const struct afs_fid *fid)
1152 {
1153 	op->file[n].fid = *fid;
1154 }
1155 
1156 /*
1157  * fs_probe.c
1158  */
1159 extern void afs_fileserver_probe_result(struct afs_call *);
1160 extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool);
1161 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
1162 extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1163 extern void afs_fs_probe_dispatcher(struct work_struct *);
1164 extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
1165 extern void afs_fs_probe_cleanup(struct afs_net *);
1166 
1167 /*
1168  * inode.c
1169  */
1170 extern const struct afs_operation_ops afs_fetch_status_operation;
1171 
1172 extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1173 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1174 extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1175 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1176 extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1177 extern struct inode *afs_root_iget(struct super_block *, struct key *);
1178 extern bool afs_check_validity(struct afs_vnode *);
1179 extern int afs_validate(struct afs_vnode *, struct key *);
1180 extern int afs_getattr(struct user_namespace *mnt_userns, const struct path *,
1181 		       struct kstat *, u32, unsigned int);
1182 extern int afs_setattr(struct user_namespace *mnt_userns, struct dentry *, struct iattr *);
1183 extern void afs_evict_inode(struct inode *);
1184 extern int afs_drop_inode(struct inode *);
1185 
1186 /*
1187  * main.c
1188  */
1189 extern struct workqueue_struct *afs_wq;
1190 extern int afs_net_id;
1191 
afs_net(struct net * net)1192 static inline struct afs_net *afs_net(struct net *net)
1193 {
1194 	return net_generic(net, afs_net_id);
1195 }
1196 
afs_sb2net(struct super_block * sb)1197 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1198 {
1199 	return afs_net(AFS_FS_S(sb)->net_ns);
1200 }
1201 
afs_d2net(struct dentry * dentry)1202 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1203 {
1204 	return afs_sb2net(dentry->d_sb);
1205 }
1206 
afs_i2net(struct inode * inode)1207 static inline struct afs_net *afs_i2net(struct inode *inode)
1208 {
1209 	return afs_sb2net(inode->i_sb);
1210 }
1211 
afs_v2net(struct afs_vnode * vnode)1212 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1213 {
1214 	return afs_i2net(&vnode->netfs.inode);
1215 }
1216 
afs_sock2net(struct sock * sk)1217 static inline struct afs_net *afs_sock2net(struct sock *sk)
1218 {
1219 	return net_generic(sock_net(sk), afs_net_id);
1220 }
1221 
__afs_stat(atomic_t * s)1222 static inline void __afs_stat(atomic_t *s)
1223 {
1224 	atomic_inc(s);
1225 }
1226 
1227 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1228 
1229 /*
1230  * misc.c
1231  */
1232 extern int afs_abort_to_error(u32);
1233 extern void afs_prioritise_error(struct afs_error *, int, u32);
1234 
1235 /*
1236  * mntpt.c
1237  */
1238 extern const struct inode_operations afs_mntpt_inode_operations;
1239 extern const struct inode_operations afs_autocell_inode_operations;
1240 extern const struct file_operations afs_mntpt_file_operations;
1241 
1242 extern struct vfsmount *afs_d_automount(struct path *);
1243 extern void afs_mntpt_kill_timer(void);
1244 
1245 /*
1246  * proc.c
1247  */
1248 #ifdef CONFIG_PROC_FS
1249 extern int __net_init afs_proc_init(struct afs_net *);
1250 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1251 extern int afs_proc_cell_setup(struct afs_cell *);
1252 extern void afs_proc_cell_remove(struct afs_cell *);
1253 extern void afs_put_sysnames(struct afs_sysnames *);
1254 #else
afs_proc_init(struct afs_net * net)1255 static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1256 static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1257 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1258 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1259 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1260 #endif
1261 
1262 /*
1263  * rotate.c
1264  */
1265 extern bool afs_select_fileserver(struct afs_operation *);
1266 extern void afs_dump_edestaddrreq(const struct afs_operation *);
1267 
1268 /*
1269  * rxrpc.c
1270  */
1271 extern struct workqueue_struct *afs_async_calls;
1272 
1273 extern int __net_init afs_open_socket(struct afs_net *);
1274 extern void __net_exit afs_close_socket(struct afs_net *);
1275 extern void afs_charge_preallocation(struct work_struct *);
1276 extern void afs_put_call(struct afs_call *);
1277 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
1278 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
1279 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1280 					    const struct afs_call_type *,
1281 					    size_t, size_t);
1282 extern void afs_flat_call_destructor(struct afs_call *);
1283 extern void afs_send_empty_reply(struct afs_call *);
1284 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1285 extern int afs_extract_data(struct afs_call *, bool);
1286 extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1287 
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1288 static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1289 				    gfp_t gfp)
1290 {
1291 	op->call = call;
1292 	op->type = call->type;
1293 	call->op = op;
1294 	call->key = op->key;
1295 	call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1296 	afs_make_call(&op->ac, call, gfp);
1297 }
1298 
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1299 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1300 {
1301 	call->iov_len = size;
1302 	call->kvec[0].iov_base = buf;
1303 	call->kvec[0].iov_len = size;
1304 	iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size);
1305 }
1306 
afs_extract_to_tmp(struct afs_call * call)1307 static inline void afs_extract_to_tmp(struct afs_call *call)
1308 {
1309 	call->iov_len = sizeof(call->tmp);
1310 	afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1311 }
1312 
afs_extract_to_tmp64(struct afs_call * call)1313 static inline void afs_extract_to_tmp64(struct afs_call *call)
1314 {
1315 	call->iov_len = sizeof(call->tmp64);
1316 	afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1317 }
1318 
afs_extract_discard(struct afs_call * call,size_t size)1319 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1320 {
1321 	call->iov_len = size;
1322 	iov_iter_discard(&call->def_iter, READ, size);
1323 }
1324 
afs_extract_to_buf(struct afs_call * call,size_t size)1325 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1326 {
1327 	call->iov_len = size;
1328 	afs_extract_begin(call, call->buffer, size);
1329 }
1330 
afs_transfer_reply(struct afs_call * call)1331 static inline int afs_transfer_reply(struct afs_call *call)
1332 {
1333 	return afs_extract_data(call, false);
1334 }
1335 
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1336 static inline bool afs_check_call_state(struct afs_call *call,
1337 					enum afs_call_state state)
1338 {
1339 	return READ_ONCE(call->state) == state;
1340 }
1341 
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1342 static inline bool afs_set_call_state(struct afs_call *call,
1343 				      enum afs_call_state from,
1344 				      enum afs_call_state to)
1345 {
1346 	bool ok = false;
1347 
1348 	spin_lock_bh(&call->state_lock);
1349 	if (call->state == from) {
1350 		call->state = to;
1351 		trace_afs_call_state(call, from, to, 0, 0);
1352 		ok = true;
1353 	}
1354 	spin_unlock_bh(&call->state_lock);
1355 	return ok;
1356 }
1357 
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1358 static inline void afs_set_call_complete(struct afs_call *call,
1359 					 int error, u32 remote_abort)
1360 {
1361 	enum afs_call_state state;
1362 	bool ok = false;
1363 
1364 	spin_lock_bh(&call->state_lock);
1365 	state = call->state;
1366 	if (state != AFS_CALL_COMPLETE) {
1367 		call->abort_code = remote_abort;
1368 		call->error = error;
1369 		call->state = AFS_CALL_COMPLETE;
1370 		trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1371 				     error, remote_abort);
1372 		ok = true;
1373 	}
1374 	spin_unlock_bh(&call->state_lock);
1375 	if (ok) {
1376 		trace_afs_call_done(call);
1377 
1378 		/* Asynchronous calls have two refs to release - one from the alloc and
1379 		 * one queued with the work item - and we can't just deallocate the
1380 		 * call because the work item may be queued again.
1381 		 */
1382 		if (call->drop_ref)
1383 			afs_put_call(call);
1384 	}
1385 }
1386 
1387 /*
1388  * security.c
1389  */
1390 extern void afs_put_permits(struct afs_permits *);
1391 extern void afs_clear_permits(struct afs_vnode *);
1392 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1393 			     struct afs_status_cb *);
1394 extern void afs_zap_permits(struct rcu_head *);
1395 extern struct key *afs_request_key(struct afs_cell *);
1396 extern struct key *afs_request_key_rcu(struct afs_cell *);
1397 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1398 extern int afs_permission(struct user_namespace *, struct inode *, int);
1399 extern void __exit afs_clean_up_permit_cache(void);
1400 
1401 /*
1402  * server.c
1403  */
1404 extern spinlock_t afs_server_peer_lock;
1405 
1406 extern struct afs_server *afs_find_server(struct afs_net *,
1407 					  const struct sockaddr_rxrpc *);
1408 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1409 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1410 extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1411 extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1412 extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1413 extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1414 extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1415 extern void afs_manage_servers(struct work_struct *);
1416 extern void afs_servers_timer(struct timer_list *);
1417 extern void afs_fs_probe_timer(struct timer_list *);
1418 extern void __net_exit afs_purge_servers(struct afs_net *);
1419 extern bool afs_check_server_record(struct afs_operation *, struct afs_server *);
1420 
afs_inc_servers_outstanding(struct afs_net * net)1421 static inline void afs_inc_servers_outstanding(struct afs_net *net)
1422 {
1423 	atomic_inc(&net->servers_outstanding);
1424 }
1425 
afs_dec_servers_outstanding(struct afs_net * net)1426 static inline void afs_dec_servers_outstanding(struct afs_net *net)
1427 {
1428 	if (atomic_dec_and_test(&net->servers_outstanding))
1429 		wake_up_var(&net->servers_outstanding);
1430 }
1431 
afs_is_probing_server(struct afs_server * server)1432 static inline bool afs_is_probing_server(struct afs_server *server)
1433 {
1434 	return list_empty(&server->probe_link);
1435 }
1436 
1437 /*
1438  * server_list.c
1439  */
afs_get_serverlist(struct afs_server_list * slist)1440 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1441 {
1442 	refcount_inc(&slist->usage);
1443 	return slist;
1444 }
1445 
1446 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1447 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
1448 						     struct afs_vldb_entry *,
1449 						     u8);
1450 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1451 
1452 /*
1453  * super.c
1454  */
1455 extern int __init afs_fs_init(void);
1456 extern void afs_fs_exit(void);
1457 
1458 /*
1459  * vlclient.c
1460  */
1461 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1462 							 const char *, int);
1463 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1464 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
1465 						struct key *, struct afs_vlserver *, unsigned int);
1466 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1467 extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1468 
1469 /*
1470  * vl_alias.c
1471  */
1472 extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1473 
1474 /*
1475  * vl_probe.c
1476  */
1477 extern void afs_vlserver_probe_result(struct afs_call *);
1478 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1479 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1480 
1481 /*
1482  * vl_rotate.c
1483  */
1484 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1485 					 struct afs_cell *, struct key *);
1486 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1487 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1488 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1489 
1490 /*
1491  * vlserver_list.c
1492  */
afs_get_vlserver(struct afs_vlserver * vlserver)1493 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1494 {
1495 	atomic_inc(&vlserver->usage);
1496 	return vlserver;
1497 }
1498 
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1499 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1500 {
1501 	if (vllist)
1502 		atomic_inc(&vllist->usage);
1503 	return vllist;
1504 }
1505 
1506 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1507 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1508 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1509 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1510 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1511 							   const void *, size_t);
1512 
1513 /*
1514  * volume.c
1515  */
1516 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1517 extern int afs_activate_volume(struct afs_volume *);
1518 extern void afs_deactivate_volume(struct afs_volume *);
1519 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1520 extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
1521 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1522 
1523 /*
1524  * write.c
1525  */
1526 #ifdef CONFIG_AFS_FSCACHE
1527 bool afs_dirty_folio(struct address_space *, struct folio *);
1528 #else
1529 #define afs_dirty_folio filemap_dirty_folio
1530 #endif
1531 extern int afs_write_begin(struct file *file, struct address_space *mapping,
1532 			loff_t pos, unsigned len,
1533 			struct page **pagep, void **fsdata);
1534 extern int afs_write_end(struct file *file, struct address_space *mapping,
1535 			loff_t pos, unsigned len, unsigned copied,
1536 			struct page *page, void *fsdata);
1537 extern int afs_writepage(struct page *, struct writeback_control *);
1538 extern int afs_writepages(struct address_space *, struct writeback_control *);
1539 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
1540 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1541 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1542 extern void afs_prune_wb_keys(struct afs_vnode *);
1543 int afs_launder_folio(struct folio *);
1544 
1545 /*
1546  * xattr.c
1547  */
1548 extern const struct xattr_handler *afs_xattr_handlers[];
1549 
1550 /*
1551  * yfsclient.c
1552  */
1553 extern void yfs_fs_fetch_data(struct afs_operation *);
1554 extern void yfs_fs_create_file(struct afs_operation *);
1555 extern void yfs_fs_make_dir(struct afs_operation *);
1556 extern void yfs_fs_remove_file2(struct afs_operation *);
1557 extern void yfs_fs_remove_file(struct afs_operation *);
1558 extern void yfs_fs_remove_dir(struct afs_operation *);
1559 extern void yfs_fs_link(struct afs_operation *);
1560 extern void yfs_fs_symlink(struct afs_operation *);
1561 extern void yfs_fs_rename(struct afs_operation *);
1562 extern void yfs_fs_store_data(struct afs_operation *);
1563 extern void yfs_fs_setattr(struct afs_operation *);
1564 extern void yfs_fs_get_volume_status(struct afs_operation *);
1565 extern void yfs_fs_set_lock(struct afs_operation *);
1566 extern void yfs_fs_extend_lock(struct afs_operation *);
1567 extern void yfs_fs_release_lock(struct afs_operation *);
1568 extern void yfs_fs_fetch_status(struct afs_operation *);
1569 extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1570 
1571 struct yfs_acl {
1572 	struct afs_acl	*acl;		/* Dir/file/symlink ACL */
1573 	struct afs_acl	*vol_acl;	/* Whole volume ACL */
1574 	u32		inherit_flag;	/* True if ACL is inherited from parent dir */
1575 	u32		num_cleaned;	/* Number of ACEs removed due to subject removal */
1576 	unsigned int	flags;
1577 #define YFS_ACL_WANT_ACL	0x01	/* Set if caller wants ->acl */
1578 #define YFS_ACL_WANT_VOL_ACL	0x02	/* Set if caller wants ->vol_acl */
1579 };
1580 
1581 extern void yfs_free_opaque_acl(struct yfs_acl *);
1582 extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1583 extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1584 
1585 /*
1586  * Miscellaneous inline functions.
1587  */
AFS_FS_I(struct inode * inode)1588 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1589 {
1590 	return container_of(inode, struct afs_vnode, netfs.inode);
1591 }
1592 
AFS_VNODE_TO_I(struct afs_vnode * vnode)1593 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1594 {
1595 	return &vnode->netfs.inode;
1596 }
1597 
1598 /*
1599  * Note that a dentry got changed.  We need to set d_fsdata to the data version
1600  * number derived from the result of the operation.  It doesn't matter if
1601  * d_fsdata goes backwards as we'll just revalidate.
1602  */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1603 static inline void afs_update_dentry_version(struct afs_operation *op,
1604 					     struct afs_vnode_param *dir_vp,
1605 					     struct dentry *dentry)
1606 {
1607 	if (!op->error)
1608 		dentry->d_fsdata =
1609 			(void *)(unsigned long)dir_vp->scb.status.data_version;
1610 }
1611 
1612 /*
1613  * Set the file size and block count.  Estimate the number of 512 bytes blocks
1614  * used, rounded up to nearest 1K for consistency with other AFS clients.
1615  */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1616 static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1617 {
1618 	i_size_write(&vnode->netfs.inode, size);
1619 	vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1620 }
1621 
1622 /*
1623  * Check for a conflicting operation on a directory that we just unlinked from.
1624  * If someone managed to sneak a link or an unlink in on the file we just
1625  * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1626  */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1627 static inline void afs_check_dir_conflict(struct afs_operation *op,
1628 					  struct afs_vnode_param *dvp)
1629 {
1630 	if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1631 		op->flags |= AFS_OPERATION_DIR_CONFLICT;
1632 }
1633 
afs_io_error(struct afs_call * call,enum afs_io_error where)1634 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1635 {
1636 	trace_afs_io_error(call->debug_id, -EIO, where);
1637 	return -EIO;
1638 }
1639 
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1640 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1641 {
1642 	trace_afs_file_error(vnode, -EIO, where);
1643 	return -EIO;
1644 }
1645 
1646 /*****************************************************************************/
1647 /*
1648  * debug tracing
1649  */
1650 extern unsigned afs_debug;
1651 
1652 #define dbgprintk(FMT,...) \
1653 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1654 
1655 #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1656 #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1657 #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1658 
1659 
1660 #if defined(__KDEBUG)
1661 #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1662 #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1663 #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1664 
1665 #elif defined(CONFIG_AFS_DEBUG)
1666 #define AFS_DEBUG_KENTER	0x01
1667 #define AFS_DEBUG_KLEAVE	0x02
1668 #define AFS_DEBUG_KDEBUG	0x04
1669 
1670 #define _enter(FMT,...)					\
1671 do {							\
1672 	if (unlikely(afs_debug & AFS_DEBUG_KENTER))	\
1673 		kenter(FMT,##__VA_ARGS__);		\
1674 } while (0)
1675 
1676 #define _leave(FMT,...)					\
1677 do {							\
1678 	if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))	\
1679 		kleave(FMT,##__VA_ARGS__);		\
1680 } while (0)
1681 
1682 #define _debug(FMT,...)					\
1683 do {							\
1684 	if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))	\
1685 		kdebug(FMT,##__VA_ARGS__);		\
1686 } while (0)
1687 
1688 #else
1689 #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1690 #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1691 #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1692 #endif
1693 
1694 /*
1695  * debug assertion checking
1696  */
1697 #if 1 // defined(__KDEBUGALL)
1698 
1699 #define ASSERT(X)						\
1700 do {								\
1701 	if (unlikely(!(X))) {					\
1702 		printk(KERN_ERR "\n");				\
1703 		printk(KERN_ERR "AFS: Assertion failed\n");	\
1704 		BUG();						\
1705 	}							\
1706 } while(0)
1707 
1708 #define ASSERTCMP(X, OP, Y)						\
1709 do {									\
1710 	if (unlikely(!((X) OP (Y)))) {					\
1711 		printk(KERN_ERR "\n");					\
1712 		printk(KERN_ERR "AFS: Assertion failed\n");		\
1713 		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
1714 		       (unsigned long)(X), (unsigned long)(Y));		\
1715 		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
1716 		       (unsigned long)(X), (unsigned long)(Y));		\
1717 		BUG();							\
1718 	}								\
1719 } while(0)
1720 
1721 #define ASSERTRANGE(L, OP1, N, OP2, H)					\
1722 do {									\
1723 	if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {		\
1724 		printk(KERN_ERR "\n");					\
1725 		printk(KERN_ERR "AFS: Assertion failed\n");		\
1726 		printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n",	\
1727 		       (unsigned long)(L), (unsigned long)(N),		\
1728 		       (unsigned long)(H));				\
1729 		printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1730 		       (unsigned long)(L), (unsigned long)(N),		\
1731 		       (unsigned long)(H));				\
1732 		BUG();							\
1733 	}								\
1734 } while(0)
1735 
1736 #define ASSERTIF(C, X)						\
1737 do {								\
1738 	if (unlikely((C) && !(X))) {				\
1739 		printk(KERN_ERR "\n");				\
1740 		printk(KERN_ERR "AFS: Assertion failed\n");	\
1741 		BUG();						\
1742 	}							\
1743 } while(0)
1744 
1745 #define ASSERTIFCMP(C, X, OP, Y)					\
1746 do {									\
1747 	if (unlikely((C) && !((X) OP (Y)))) {				\
1748 		printk(KERN_ERR "\n");					\
1749 		printk(KERN_ERR "AFS: Assertion failed\n");		\
1750 		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
1751 		       (unsigned long)(X), (unsigned long)(Y));		\
1752 		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
1753 		       (unsigned long)(X), (unsigned long)(Y));		\
1754 		BUG();							\
1755 	}								\
1756 } while(0)
1757 
1758 #else
1759 
1760 #define ASSERT(X)				\
1761 do {						\
1762 } while(0)
1763 
1764 #define ASSERTCMP(X, OP, Y)			\
1765 do {						\
1766 } while(0)
1767 
1768 #define ASSERTRANGE(L, OP1, N, OP2, H)		\
1769 do {						\
1770 } while(0)
1771 
1772 #define ASSERTIF(C, X)				\
1773 do {						\
1774 } while(0)
1775 
1776 #define ASSERTIFCMP(C, X, OP, Y)		\
1777 do {						\
1778 } while(0)
1779 
1780 #endif /* __KDEBUGALL */
1781