1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/* internal AFS stuff
   3 *
   4 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
   5 * Written by David Howells (dhowells@redhat.com)
   6 */
   7
   8#include <linux/compiler.h>
   9#include <linux/kernel.h>
  10#include <linux/ktime.h>
  11#include <linux/fs.h>
  12#include <linux/filelock.h>
  13#include <linux/pagemap.h>
  14#include <linux/rxrpc.h>
  15#include <linux/key.h>
  16#include <linux/workqueue.h>
  17#include <linux/sched.h>
 
  18#include <linux/fscache.h>
  19#include <linux/backing-dev.h>
  20#include <linux/uuid.h>
  21#include <linux/mm_types.h>
  22#include <linux/dns_resolver.h>
  23#include <net/net_namespace.h>
  24#include <net/netns/generic.h>
  25#include <net/sock.h>
  26#include <net/af_rxrpc.h>
  27
  28#include "afs.h"
  29#include "afs_vl.h"
  30
  31#define AFS_CELL_MAX_ADDRS 15
  32
  33struct pagevec;
  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 int		max_lifespan;	/* Maximum lifespan in secs to set if not 0 */
 167	unsigned		request_size;	/* size of request data */
 168	unsigned		reply_max;	/* maximum size of reply */
 169	unsigned		count2;		/* count used in unmarshalling */
 170	unsigned char		unmarshall;	/* unmarshalling phase */
 
 171	bool			drop_ref;	/* T if need to drop ref for incoming call */
 172	bool			need_attention;	/* T if RxRPC poked us */
 173	bool			async;		/* T if asynchronous */
 174	bool			upgrade;	/* T to request service upgrade */
 
 175	bool			intr;		/* T if interruptible */
 176	bool			unmarshalling_error; /* T if an unmarshalling error occurred */
 177	bool			responded;	/* Got a response from the call (may be abort) */
 178	u16			service_id;	/* Actual service ID (after upgrade) */
 179	unsigned int		debug_id;	/* Trace ID */
 180	u32			operation_ID;	/* operation ID for an incoming call */
 181	u32			count;		/* count for use in unmarshalling */
 182	union {					/* place to extract temporary data */
 183		struct {
 184			__be32	tmp_u;
 185			__be32	tmp;
 186		} __attribute__((packed));
 187		__be64		tmp64;
 188	};
 189	ktime_t			issue_time;	/* Time of issue of operation */
 190};
 191
 192struct afs_call_type {
 193	const char *name;
 194	unsigned int op; /* Really enum afs_fs_operation */
 195
 196	/* deliver request or reply data to an call
 197	 * - returning an error will cause the call to be aborted
 198	 */
 199	int (*deliver)(struct afs_call *call);
 200
 201	/* clean up a call */
 202	void (*destructor)(struct afs_call *call);
 203
 204	/* Work function */
 205	void (*work)(struct work_struct *work);
 206
 207	/* Call done function (gets called immediately on success or failure) */
 208	void (*done)(struct afs_call *call);
 209};
 210
 211/*
 212 * Key available for writeback on a file.
 213 */
 214struct afs_wb_key {
 215	refcount_t		usage;
 216	struct key		*key;
 217	struct list_head	vnode_link;	/* Link in vnode->wb_keys */
 218};
 219
 220/*
 221 * AFS open file information record.  Pointed to by file->private_data.
 222 */
 223struct afs_file {
 224	struct key		*key;		/* The key this file was opened with */
 225	struct afs_wb_key	*wb;		/* Writeback key record for this file */
 226};
 227
 228static inline struct key *afs_file_key(struct file *file)
 229{
 230	struct afs_file *af = file->private_data;
 231
 232	return af->key;
 233}
 234
 235/*
 236 * Record of an outstanding read operation on a vnode.
 237 */
 238struct afs_read {
 239	loff_t			pos;		/* Where to start reading */
 240	loff_t			len;		/* How much we're asking for */
 241	loff_t			actual_len;	/* How much we're actually getting */
 242	loff_t			file_size;	/* File size returned by server */
 243	struct key		*key;		/* The key to use to reissue the read */
 244	struct afs_vnode	*vnode;		/* The file being read into. */
 245	struct netfs_io_subrequest *subreq;	/* Fscache helper read request this belongs to */
 246	afs_dataversion_t	data_version;	/* Version number returned by server */
 247	refcount_t		usage;
 248	unsigned int		call_debug_id;
 249	unsigned int		nr_pages;
 250	int			error;
 251	void (*done)(struct afs_read *);
 252	void (*cleanup)(struct afs_read *);
 253	struct iov_iter		*iter;		/* Iterator representing the buffer */
 254	struct iov_iter		def_iter;	/* Default iterator */
 255};
 256
 257/*
 258 * AFS superblock private data
 259 * - there's one superblock per volume
 260 */
 261struct afs_super_info {
 262	struct net		*net_ns;	/* Network namespace */
 263	struct afs_cell		*cell;		/* The cell in which the volume resides */
 264	struct afs_volume	*volume;	/* volume record */
 265	enum afs_flock_mode	flock_mode:8;	/* File locking emulation mode */
 266	bool			dyn_root;	/* True if dynamic root */
 267};
 268
 269static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 270{
 271	return sb->s_fs_info;
 272}
 273
 274extern struct file_system_type afs_fs_type;
 275
 276/*
 277 * Set of substitutes for @sys.
 278 */
 279struct afs_sysnames {
 280#define AFS_NR_SYSNAME 16
 281	char			*subs[AFS_NR_SYSNAME];
 282	refcount_t		usage;
 283	unsigned short		nr;
 284	char			blank[1];
 285};
 286
 287/*
 288 * AFS network namespace record.
 289 */
 290struct afs_net {
 291	struct net		*net;		/* Backpointer to the owning net namespace */
 292	struct afs_uuid		uuid;
 293	bool			live;		/* F if this namespace is being removed */
 294
 295	/* AF_RXRPC I/O stuff */
 296	struct socket		*socket;
 297	struct afs_call		*spare_incoming_call;
 298	struct work_struct	charge_preallocation_work;
 299	struct mutex		socket_mutex;
 300	atomic_t		nr_outstanding_calls;
 301	atomic_t		nr_superblocks;
 302
 303	/* Cell database */
 304	struct rb_root		cells;
 305	struct afs_cell		*ws_cell;
 306	struct work_struct	cells_manager;
 307	struct timer_list	cells_timer;
 308	atomic_t		cells_outstanding;
 309	struct rw_semaphore	cells_lock;
 310	struct mutex		cells_alias_lock;
 311
 312	struct mutex		proc_cells_lock;
 313	struct hlist_head	proc_cells;
 314
 315	/* Known servers.  Theoretically each fileserver can only be in one
 316	 * cell, but in practice, people create aliases and subsets and there's
 317	 * no easy way to distinguish them.
 318	 */
 319	seqlock_t		fs_lock;	/* For fs_servers, fs_probe_*, fs_proc */
 320	struct rb_root		fs_servers;	/* afs_server (by server UUID or address) */
 321	struct list_head	fs_probe_fast;	/* List of afs_server to probe at 30s intervals */
 322	struct list_head	fs_probe_slow;	/* List of afs_server to probe at 5m intervals */
 323	struct hlist_head	fs_proc;	/* procfs servers list */
 324
 325	struct hlist_head	fs_addresses;	/* afs_server (by lowest IPv6 addr) */
 
 326	seqlock_t		fs_addr_lock;	/* For fs_addresses[46] */
 327
 328	struct work_struct	fs_manager;
 329	struct timer_list	fs_timer;
 330
 331	struct work_struct	fs_prober;
 332	struct timer_list	fs_probe_timer;
 333	atomic_t		servers_outstanding;
 334
 335	/* File locking renewal management */
 336	struct mutex		lock_manager_mutex;
 337
 338	/* Misc */
 339	struct super_block	*dynroot_sb;	/* Dynamic root mount superblock */
 340	struct proc_dir_entry	*proc_afs;	/* /proc/net/afs directory */
 341	struct afs_sysnames	*sysnames;
 342	rwlock_t		sysnames_lock;
 343	struct afs_addr_preference_list __rcu *address_prefs;
 344	u16			address_pref_version;
 345
 346	/* Statistics counters */
 347	atomic_t		n_lookup;	/* Number of lookups done */
 348	atomic_t		n_reval;	/* Number of dentries needing revalidation */
 349	atomic_t		n_inval;	/* Number of invalidations by the server */
 350	atomic_t		n_relpg;	/* Number of invalidations by release_folio */
 351	atomic_t		n_read_dir;	/* Number of directory pages read */
 352	atomic_t		n_dir_cr;	/* Number of directory entry creation edits */
 353	atomic_t		n_dir_rm;	/* Number of directory entry removal edits */
 354	atomic_t		n_stores;	/* Number of store ops */
 355	atomic_long_t		n_store_bytes;	/* Number of bytes stored */
 356	atomic_long_t		n_fetch_bytes;	/* Number of bytes fetched */
 357	atomic_t		n_fetches;	/* Number of data fetch ops */
 358};
 359
 360extern const char afs_init_sysname[];
 361
 362enum afs_cell_state {
 363	AFS_CELL_UNSET,
 364	AFS_CELL_ACTIVATING,
 365	AFS_CELL_ACTIVE,
 366	AFS_CELL_DEACTIVATING,
 367	AFS_CELL_INACTIVE,
 368	AFS_CELL_FAILED,
 369	AFS_CELL_REMOVED,
 370};
 371
 372/*
 373 * AFS cell record.
 374 *
 375 * This is a tricky concept to get right as it is possible to create aliases
 376 * simply by pointing AFSDB/SRV records for two names at the same set of VL
 377 * servers; it is also possible to do things like setting up two sets of VL
 378 * servers, one of which provides a superset of the volumes provided by the
 379 * other (for internal/external division, for example).
 380 *
 381 * Cells only exist in the sense that (a) a cell's name maps to a set of VL
 382 * servers and (b) a cell's name is used by the client to select the key to use
 383 * for authentication and encryption.  The cell name is not typically used in
 384 * the protocol.
 385 *
 386 * Two cells are determined to be aliases if they have an explicit alias (YFS
 387 * only), share any VL servers in common or have at least one volume in common.
 388 * "In common" means that the address list of the VL servers or the fileservers
 389 * share at least one endpoint.
 390 */
 391struct afs_cell {
 392	union {
 393		struct rcu_head	rcu;
 394		struct rb_node	net_node;	/* Node in net->cells */
 395	};
 396	struct afs_net		*net;
 397	struct afs_cell		*alias_of;	/* The cell this is an alias of */
 398	struct afs_volume	*root_volume;	/* The root.cell volume if there is one */
 399	struct key		*anonymous_key;	/* anonymous user key for this cell */
 400	struct work_struct	manager;	/* Manager for init/deinit/dns */
 401	struct hlist_node	proc_link;	/* /proc cell list link */
 
 
 
 402	time64_t		dns_expiry;	/* Time AFSDB/SRV record expires */
 403	time64_t		last_inactive;	/* Time of last drop of usage count */
 404	refcount_t		ref;		/* Struct refcount */
 405	atomic_t		active;		/* Active usage counter */
 406	unsigned long		flags;
 407#define AFS_CELL_FL_NO_GC	0		/* The cell was added manually, don't auto-gc */
 408#define AFS_CELL_FL_DO_LOOKUP	1		/* DNS lookup requested */
 409#define AFS_CELL_FL_CHECK_ALIAS	2		/* Need to check for aliases */
 410	enum afs_cell_state	state;
 411	short			error;
 412	enum dns_record_source	dns_source:8;	/* Latest source of data from lookup */
 413	enum dns_lookup_status	dns_status:8;	/* Latest status of data from lookup */
 414	unsigned int		dns_lookup_count; /* Counter of DNS lookups */
 415	unsigned int		debug_id;
 416
 417	/* The volumes belonging to this cell */
 418	struct rw_semaphore	vs_lock;	/* Lock for server->volumes */
 419	struct rb_root		volumes;	/* Tree of volumes on this server */
 420	struct hlist_head	proc_volumes;	/* procfs volume list */
 421	seqlock_t		volume_lock;	/* For volumes */
 422
 423	/* Active fileserver interaction state. */
 424	struct rb_root		fs_servers;	/* afs_server (by server UUID) */
 425	seqlock_t		fs_lock;	/* For fs_servers  */
 426
 427	/* VL server list. */
 428	rwlock_t		vl_servers_lock; /* Lock on vl_servers */
 429	struct afs_vlserver_list __rcu *vl_servers;
 430
 431	u8			name_len;	/* Length of name */
 432	char			*name;		/* Cell name, case-flattened and NUL-padded */
 433};
 434
 435/*
 436 * Volume Location server record.
 437 */
 438struct afs_vlserver {
 439	struct rcu_head		rcu;
 440	struct afs_addr_list	__rcu *addresses; /* List of addresses for this VL server */
 441	unsigned long		flags;
 442#define AFS_VLSERVER_FL_PROBED	0		/* The VL server has been probed */
 443#define AFS_VLSERVER_FL_PROBING	1		/* VL server is being probed */
 444#define AFS_VLSERVER_FL_IS_YFS	2		/* Server is YFS not AFS */
 445#define AFS_VLSERVER_FL_RESPONDING 3		/* VL server is responding */
 446	rwlock_t		lock;		/* Lock on addresses */
 447	refcount_t		ref;
 448	unsigned int		rtt;		/* Server's current RTT in uS */
 449	unsigned int		debug_id;
 450
 451	/* Probe state */
 452	wait_queue_head_t	probe_wq;
 453	atomic_t		probe_outstanding;
 454	spinlock_t		probe_lock;
 455	struct {
 456		unsigned int	rtt;		/* Best RTT in uS (or UINT_MAX) */
 457		u32		abort_code;
 458		short		error;
 459		unsigned short	flags;
 460#define AFS_VLSERVER_PROBE_RESPONDED		0x01 /* At least once response (may be abort) */
 461#define AFS_VLSERVER_PROBE_IS_YFS		0x02 /* The peer appears to be YFS */
 462#define AFS_VLSERVER_PROBE_NOT_YFS		0x04 /* The peer appears not to be YFS */
 463#define AFS_VLSERVER_PROBE_LOCAL_FAILURE	0x08 /* A local failure prevented a probe */
 464	} probe;
 465
 466	u16			service_id;	/* Service ID we're using */
 467	u16			port;
 468	u16			name_len;	/* Length of name */
 469	char			name[];		/* Server name, case-flattened */
 470};
 471
 472/*
 473 * Weighted list of Volume Location servers.
 474 */
 475struct afs_vlserver_entry {
 476	u16			priority;	/* Preference (as SRV) */
 477	u16			weight;		/* Weight (as SRV) */
 478	enum dns_record_source	source:8;
 479	enum dns_lookup_status	status:8;
 480	struct afs_vlserver	*server;
 481};
 482
 483struct afs_vlserver_list {
 484	struct rcu_head		rcu;
 485	refcount_t		ref;
 486	u8			nr_servers;
 487	u8			index;		/* Server currently in use */
 488	u8			preferred;	/* Preferred server */
 489	enum dns_record_source	source:8;
 490	enum dns_lookup_status	status:8;
 491	rwlock_t		lock;
 492	struct afs_vlserver_entry servers[];
 493};
 494
 495/*
 496 * Cached VLDB entry.
 497 *
 498 * This is pointed to by cell->vldb_entries, indexed by name.
 499 */
 500struct afs_vldb_entry {
 501	afs_volid_t		vid[3];		/* Volume IDs for R/W, R/O and Bak volumes */
 502
 503	unsigned long		flags;
 504#define AFS_VLDB_HAS_RW		0		/* - R/W volume exists */
 505#define AFS_VLDB_HAS_RO		1		/* - R/O volume exists */
 506#define AFS_VLDB_HAS_BAK	2		/* - Backup volume exists */
 507#define AFS_VLDB_QUERY_VALID	3		/* - Record is valid */
 508#define AFS_VLDB_QUERY_ERROR	4		/* - VL server returned error */
 509
 510	uuid_t			fs_server[AFS_NMAXNSERVERS];
 511	u32			addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
 512	u8			fs_mask[AFS_NMAXNSERVERS];
 513#define AFS_VOL_VTM_RW	0x01 /* R/W version of the volume is available (on this server) */
 514#define AFS_VOL_VTM_RO	0x02 /* R/O version of the volume is available (on this server) */
 515#define AFS_VOL_VTM_BAK	0x04 /* backup version of the volume is available (on this server) */
 516	u8			vlsf_flags[AFS_NMAXNSERVERS];
 517	short			error;
 518	u8			nr_servers;	/* Number of server records */
 519	u8			name_len;
 520	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
 521};
 522
 523/*
 524 * Fileserver endpoint state.  The records the addresses of a fileserver's
 525 * endpoints and the state and result of a round of probing on them.  This
 526 * allows the rotation algorithm to access those results without them being
 527 * erased by a subsequent round of probing.
 528 */
 529struct afs_endpoint_state {
 530	struct rcu_head		rcu;
 531	struct afs_addr_list	*addresses;	/* The addresses being probed */
 532	unsigned long		responsive_set;	/* Bitset of responsive endpoints */
 533	unsigned long		failed_set;	/* Bitset of endpoints we failed to probe */
 534	refcount_t		ref;
 535	unsigned int		server_id;	/* Debug ID of server */
 536	unsigned int		probe_seq;	/* Probe sequence (from server::probe_counter) */
 537	atomic_t		nr_probing;	/* Number of outstanding probes */
 538	unsigned int		rtt;		/* Best RTT in uS (or UINT_MAX) */
 539	s32			abort_code;
 540	short			error;
 541	unsigned long		flags;
 542#define AFS_ESTATE_RESPONDED	0		/* Set if the server responded */
 543#define AFS_ESTATE_SUPERSEDED	1		/* Set if this record has been superseded */
 544#define AFS_ESTATE_IS_YFS	2		/* Set if probe upgraded to YFS */
 545#define AFS_ESTATE_NOT_YFS	3		/* Set if probe didn't upgrade to YFS */
 546#define AFS_ESTATE_LOCAL_FAILURE 4		/* Set if there was a local failure (eg. ENOMEM) */
 547};
 548
 549/*
 550 * Record of fileserver with which we're actively communicating.
 551 */
 552struct afs_server {
 553	struct rcu_head		rcu;
 554	union {
 555		uuid_t		uuid;		/* Server ID */
 556		struct afs_uuid	_uuid;
 557	};
 558
 
 559	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
 560	struct rb_node		uuid_rb;	/* Link in net->fs_servers */
 561	struct afs_server __rcu	*uuid_next;	/* Next server with same UUID */
 562	struct afs_server	*uuid_prev;	/* Previous server with same UUID */
 563	struct list_head	probe_link;	/* Link in net->fs_probe_list */
 564	struct hlist_node	addr_link;	/* Link in net->fs_addresses6 */
 
 565	struct hlist_node	proc_link;	/* Link in net->fs_proc */
 566	struct list_head	volumes;	/* RCU list of afs_server_entry objects */
 567	struct afs_server	*gc_next;	/* Next server in manager's list */
 568	time64_t		unuse_time;	/* Time at which last unused */
 569	unsigned long		flags;
 570#define AFS_SERVER_FL_RESPONDING 0		/* The server is responding */
 571#define AFS_SERVER_FL_UPDATING	1
 572#define AFS_SERVER_FL_NEEDS_UPDATE 2		/* Fileserver address list is out of date */
 573#define AFS_SERVER_FL_NOT_READY	4		/* The record is not ready for use */
 574#define AFS_SERVER_FL_NOT_FOUND	5		/* VL server says no such server */
 575#define AFS_SERVER_FL_VL_FAIL	6		/* Failed to access VL server */
 576#define AFS_SERVER_FL_MAY_HAVE_CB 8		/* May have callbacks on this fileserver */
 577#define AFS_SERVER_FL_IS_YFS	16		/* Server is YFS not AFS */
 578#define AFS_SERVER_FL_NO_IBULK	17		/* Fileserver doesn't support FS.InlineBulkStatus */
 579#define AFS_SERVER_FL_NO_RM2	18		/* Fileserver doesn't support YFS.RemoveFile2 */
 580#define AFS_SERVER_FL_HAS_FS64	19		/* Fileserver supports FS.{Fetch,Store}Data64 */
 581	refcount_t		ref;		/* Object refcount */
 582	atomic_t		active;		/* Active user count */
 583	u32			addr_version;	/* Address list version */
 584	u16			service_id;	/* Service ID we're using. */
 585	unsigned int		rtt;		/* Server's current RTT in uS */
 586	unsigned int		debug_id;	/* Debugging ID for traces */
 587
 588	/* file service access */
 589	rwlock_t		fs_lock;	/* access lock */
 590
 
 
 
 591	/* Probe state */
 592	struct afs_endpoint_state __rcu *endpoint_state; /* Latest endpoint/probe state */
 593	unsigned long		probed_at;	/* Time last probe was dispatched (jiffies) */
 594	wait_queue_head_t	probe_wq;
 595	unsigned int		probe_counter;	/* Number of probes issued */
 596	spinlock_t		probe_lock;
 
 
 
 
 
 
 
 
 
 597};
 598
 599enum afs_ro_replicating {
 600	AFS_RO_NOT_REPLICATING,			/* Not doing replication */
 601	AFS_RO_REPLICATING_USE_OLD,		/* Replicating; use old version */
 602	AFS_RO_REPLICATING_USE_NEW,		/* Replicating; switch to new version */
 603} __mode(byte);
 604
 605/*
 606 * Replaceable volume server list.
 607 */
 608struct afs_server_entry {
 609	struct afs_server	*server;
 610	struct afs_volume	*volume;
 611	struct list_head	slink;		/* Link in server->volumes */
 612	time64_t		cb_expires_at;	/* Time at which volume-level callback expires */
 613	unsigned long		flags;
 614#define AFS_SE_EXCLUDED		0		/* Set if server is to be excluded in rotation */
 615#define AFS_SE_VOLUME_OFFLINE	1		/* Set if volume offline notice given */
 616#define AFS_SE_VOLUME_BUSY	2		/* Set if volume busy notice given */
 617};
 618
 619struct afs_server_list {
 620	struct rcu_head		rcu;
 621	refcount_t		usage;
 622	bool			attached;	/* T if attached to servers */
 623	enum afs_ro_replicating	ro_replicating;	/* RW->RO update (probably) in progress */
 624	unsigned char		nr_servers;
 
 625	unsigned short		vnovol_mask;	/* Servers to be skipped due to VNOVOL */
 626	unsigned int		seq;		/* Set to ->servers_seq when installed */
 627	rwlock_t		lock;
 628	struct afs_server_entry	servers[];
 629};
 630
 631/*
 632 * Live AFS volume management.
 633 */
 634struct afs_volume {
 635	struct rcu_head	rcu;
 636	afs_volid_t		vid;		/* The volume ID of this volume */
 637	afs_volid_t		vids[AFS_MAXTYPES]; /* All associated volume IDs */
 638	refcount_t		ref;
 
 639	time64_t		update_at;	/* Time at which to next update */
 640	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
 641	struct rb_node		cell_node;	/* Link in cell->volumes */
 642	struct hlist_node	proc_link;	/* Link in cell->proc_volumes */
 643	struct super_block __rcu *sb;		/* Superblock on which inodes reside */
 644	struct work_struct	destructor;	/* Deferred destructor */
 645	unsigned long		flags;
 646#define AFS_VOLUME_NEEDS_UPDATE	0	/* - T if an update needs performing */
 647#define AFS_VOLUME_UPDATING	1	/* - T if an update is in progress */
 648#define AFS_VOLUME_WAIT		2	/* - T if users must wait for update */
 649#define AFS_VOLUME_DELETED	3	/* - T if volume appears deleted */
 650#define AFS_VOLUME_MAYBE_NO_IBULK 4	/* - T if some servers don't have InlineBulkStatus */
 651#define AFS_VOLUME_RM_TREE	5	/* - Set if volume removed from cell->volumes */
 
 652#ifdef CONFIG_AFS_FSCACHE
 653	struct fscache_volume	*cache;		/* Caching cookie */
 654#endif
 655	struct afs_server_list __rcu *servers;	/* List of servers on which volume resides */
 656	rwlock_t		servers_lock;	/* Lock for ->servers */
 657	unsigned int		servers_seq;	/* Incremented each time ->servers changes */
 658
 659	/* RO release tracking */
 660	struct mutex		volsync_lock;	/* Time/state evaluation lock */
 661	time64_t		creation_time;	/* Volume creation time (or TIME64_MIN) */
 662	time64_t		update_time;	/* Volume update time (or TIME64_MIN) */
 663
 664	/* Callback management */
 665	struct mutex		cb_check_lock;	/* Lock to control race to check after v_break */
 666	time64_t		cb_expires_at;	/* Earliest volume callback expiry time */
 667	atomic_t		cb_ro_snapshot;	/* RO volume update-from-snapshot counter */
 668	atomic_t		cb_v_break;	/* Volume-break event counter. */
 669	atomic_t		cb_v_check;	/* Volume-break has-been-checked counter. */
 670	atomic_t		cb_scrub;	/* Scrub-all-data event counter. */
 671	rwlock_t		cb_v_break_lock;
 672	struct rw_semaphore	open_mmaps_lock;
 673	struct list_head	open_mmaps;	/* List of vnodes that are mmapped */
 674
 675	afs_voltype_t		type;		/* type of volume */
 676	char			type_force;	/* force volume type (suppress R/O -> R/W) */
 677	u8			name_len;
 678	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
 679};
 680
 681enum afs_lock_state {
 682	AFS_VNODE_LOCK_NONE,		/* The vnode has no lock on the server */
 683	AFS_VNODE_LOCK_WAITING_FOR_CB,	/* We're waiting for the server to break the callback */
 684	AFS_VNODE_LOCK_SETTING,		/* We're asking the server for a lock */
 685	AFS_VNODE_LOCK_GRANTED,		/* We have a lock on the server */
 686	AFS_VNODE_LOCK_EXTENDING,	/* We're extending a lock on the server */
 687	AFS_VNODE_LOCK_NEED_UNLOCK,	/* We need to unlock on the server */
 688	AFS_VNODE_LOCK_UNLOCKING,	/* We're telling the server to unlock */
 689	AFS_VNODE_LOCK_DELETED,		/* The vnode has been deleted whilst we have a lock */
 690};
 691
 692/*
 693 * AFS inode private data.
 694 *
 695 * Note that afs_alloc_inode() *must* reset anything that could incorrectly
 696 * leak from one inode to another.
 697 */
 698struct afs_vnode {
 699	struct netfs_inode	netfs;		/* Netfslib context and vfs inode */
 
 700	struct afs_volume	*volume;	/* volume on which vnode resides */
 701	struct afs_fid		fid;		/* the file identifier for this inode */
 702	struct afs_file_status	status;		/* AFS status info for this file */
 703	afs_dataversion_t	invalid_before;	/* Child dentries are invalid before this */
 
 
 
 704	struct afs_permits __rcu *permit_cache;	/* cache of permits so far obtained */
 705	struct mutex		io_lock;	/* Lock for serialising I/O on this mutex */
 706	struct rw_semaphore	validate_lock;	/* lock for validating this vnode */
 707	struct rw_semaphore	rmdir_lock;	/* Lock for rmdir vs sillyrename */
 708	struct key		*silly_key;	/* Silly rename key */
 709	spinlock_t		wb_lock;	/* lock for wb_keys */
 710	spinlock_t		lock;		/* waitqueue/flags lock */
 711	unsigned long		flags;
 
 712#define AFS_VNODE_UNSET		1		/* set if vnode attributes not yet set */
 713#define AFS_VNODE_DIR_VALID	2		/* Set if dir contents are valid */
 714#define AFS_VNODE_ZAP_DATA	3		/* set if vnode's data should be invalidated */
 715#define AFS_VNODE_DELETED	4		/* set if vnode deleted on server */
 716#define AFS_VNODE_MOUNTPOINT	5		/* set if vnode is a mountpoint symlink */
 717#define AFS_VNODE_AUTOCELL	6		/* set if Vnode is an auto mount point */
 718#define AFS_VNODE_PSEUDODIR	7 		/* set if Vnode is a pseudo directory */
 719#define AFS_VNODE_NEW_CONTENT	8		/* Set if file has new content (create/trunc-0) */
 720#define AFS_VNODE_SILLY_DELETED	9		/* Set if file has been silly-deleted */
 721#define AFS_VNODE_MODIFYING	10		/* Set if we're performing a modification op */
 722
 723	struct list_head	wb_keys;	/* List of keys available for writeback */
 724	struct list_head	pending_locks;	/* locks waiting to be granted */
 725	struct list_head	granted_locks;	/* locks granted on this file */
 726	struct delayed_work	lock_work;	/* work to be done in locking */
 727	struct key		*lock_key;	/* Key to be used in lock ops */
 728	ktime_t			locked_at;	/* Time at which lock obtained */
 729	enum afs_lock_state	lock_state : 8;
 730	afs_lock_type_t		lock_type : 8;
 731
 732	/* outstanding callback notification on this file */
 733	struct work_struct	cb_work;	/* Work for mmap'd files */
 734	struct list_head	cb_mmap_link;	/* Link in cell->fs_open_mmaps */
 735	void			*cb_server;	/* Server with callback/filelock */
 736	atomic_t		cb_nr_mmap;	/* Number of mmaps */
 737	unsigned int		cb_ro_snapshot;	/* RO volume release counter on ->volume */
 738	unsigned int		cb_scrub;	/* Scrub counter on ->volume */
 739	unsigned int		cb_break;	/* Break counter on vnode */
 740	unsigned int		cb_v_check;	/* Break check counter on ->volume */
 741	seqlock_t		cb_lock;	/* Lock for ->cb_server, ->status, ->cb_*break */
 742
 743	atomic64_t		cb_expires_at;	/* time at which callback expires */
 744#define AFS_NO_CB_PROMISE TIME64_MIN
 745};
 746
 747static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
 748{
 749#ifdef CONFIG_AFS_FSCACHE
 750	return netfs_i_cookie(&vnode->netfs);
 751#else
 752	return NULL;
 753#endif
 754}
 755
 756static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
 757				       struct fscache_cookie *cookie)
 758{
 759#ifdef CONFIG_AFS_FSCACHE
 760	vnode->netfs.cache = cookie;
 761	if (cookie)
 762		mapping_set_release_always(vnode->netfs.inode.i_mapping);
 763#endif
 764}
 765
 766/*
 767 * cached security record for one user's attempt to access a vnode
 768 */
 769struct afs_permit {
 770	struct key		*key;		/* RxRPC ticket holding a security context */
 771	afs_access_t		access;		/* CallerAccess value for this key */
 772};
 773
 774/*
 775 * Immutable cache of CallerAccess records from attempts to access vnodes.
 776 * These may be shared between multiple vnodes.
 777 */
 778struct afs_permits {
 779	struct rcu_head		rcu;
 780	struct hlist_node	hash_node;	/* Link in hash */
 781	unsigned long		h;		/* Hash value for this permit list */
 782	refcount_t		usage;
 783	unsigned short		nr_permits;	/* Number of records */
 784	bool			invalidated;	/* Invalidated due to key change */
 785	struct afs_permit	permits[] __counted_by(nr_permits);	/* List of permits sorted by key pointer */
 786};
 787
 788/*
 789 * Error prioritisation and accumulation.
 790 */
 791struct afs_error {
 792	s32	abort_code;		/* Cumulative abort code */
 793	short	error;			/* Cumulative error */
 794	bool	responded;		/* T if server responded */
 795	bool	aborted;		/* T if ->error is from an abort */
 
 
 
 
 
 
 
 
 
 
 
 
 796};
 797
 798/*
 799 * Cursor for iterating over a set of volume location servers.
 800 */
 801struct afs_vl_cursor {
 
 802	struct afs_cell		*cell;		/* The cell we're querying */
 803	struct afs_vlserver_list *server_list;	/* Current server list (pins ref) */
 804	struct afs_vlserver	*server;	/* Server on which this resides */
 805	struct afs_addr_list	*alist;		/* Current address list (pins ref) */
 806	struct key		*key;		/* Key for the server */
 807	unsigned long		untried_servers; /* Bitmask of untried servers */
 808	unsigned long		addr_tried;	/* Tried addresses */
 809	struct afs_error	cumul_error;	/* Cumulative error */
 810	unsigned int		debug_id;
 811	s32			call_abort_code;
 812	short			call_error;	/* Error from single call */
 813	short			server_index;	/* Current server */
 814	signed char		addr_index;	/* Current address */
 815	unsigned short		flags;
 816#define AFS_VL_CURSOR_STOP	0x0001		/* Set to cease iteration */
 817#define AFS_VL_CURSOR_RETRY	0x0002		/* Set to do a retry */
 818#define AFS_VL_CURSOR_RETRIED	0x0004		/* Set if started a retry */
 819	short			nr_iterations;	/* Number of server iterations */
 820	bool			call_responded;	/* T if the current address responded */
 821};
 822
 823/*
 824 * Fileserver state tracking for an operation.  An array of these is kept,
 825 * indexed by server index.
 826 */
 827struct afs_server_state {
 828	/* Tracking of fileserver probe state.  Other operations may interfere
 829	 * by probing a fileserver when accessing other volumes.
 830	 */
 831	unsigned int		probe_seq;
 832	unsigned long		untried_addrs;	/* Addresses we haven't tried yet */
 833	struct wait_queue_entry	probe_waiter;
 834	struct afs_endpoint_state *endpoint_state; /* Endpoint state being monitored */
 835};
 836
 837/*
 838 * Fileserver operation methods.
 839 */
 840struct afs_operation_ops {
 841	void (*issue_afs_rpc)(struct afs_operation *op);
 842	void (*issue_yfs_rpc)(struct afs_operation *op);
 843	void (*success)(struct afs_operation *op);
 844	void (*aborted)(struct afs_operation *op);
 845	void (*failed)(struct afs_operation *op);
 846	void (*edit_dir)(struct afs_operation *op);
 847	void (*put)(struct afs_operation *op);
 848};
 849
 850struct afs_vnode_param {
 851	struct afs_vnode	*vnode;
 852	struct afs_fid		fid;		/* Fid to access */
 853	struct afs_status_cb	scb;		/* Returned status and callback promise */
 854	afs_dataversion_t	dv_before;	/* Data version before the call */
 855	unsigned int		cb_break_before; /* cb_break before the call */
 856	u8			dv_delta;	/* Expected change in data version */
 857	bool			put_vnode:1;	/* T if we have a ref on the vnode */
 858	bool			need_io_lock:1;	/* T if we need the I/O lock on this */
 859	bool			update_ctime:1;	/* Need to update the ctime */
 860	bool			set_size:1;	/* Must update i_size */
 861	bool			op_unlinked:1;	/* True if file was unlinked by op */
 862	bool			speculative:1;	/* T if speculative status fetch (no vnode lock) */
 863	bool			modification:1;	/* Set if the content gets modified */
 864};
 865
 866/*
 867 * Fileserver operation wrapper, handling server and address rotation
 868 * asynchronously.  May make simultaneous calls to multiple servers.
 869 */
 870struct afs_operation {
 871	struct afs_net		*net;		/* Network namespace */
 872	struct key		*key;		/* Key for the cell */
 873	const struct afs_call_type *type;	/* Type of call done */
 874	const struct afs_operation_ops *ops;
 875
 876	/* Parameters/results for the operation */
 877	struct afs_volume	*volume;	/* Volume being accessed */
 878	struct afs_vnode_param	file[2];
 879	struct afs_vnode_param	*more_files;
 880	struct afs_volsync	pre_volsync;	/* Volsync before op */
 881	struct afs_volsync	volsync;	/* Volsync returned by op */
 882	struct dentry		*dentry;	/* Dentry to be altered */
 883	struct dentry		*dentry_2;	/* Second dentry to be altered */
 884	struct timespec64	mtime;		/* Modification time to record */
 885	struct timespec64	ctime;		/* Change time to set */
 886	struct afs_error	cumul_error;	/* Cumulative error */
 887	short			nr_files;	/* Number of entries in file[], more_files */
 
 888	unsigned int		debug_id;
 889
 890	unsigned int		cb_v_break;	/* Volume break counter before op */
 
 891
 892	union {
 893		struct {
 894			int	which;		/* Which ->file[] to fetch for */
 895		} fetch_status;
 896		struct {
 897			int	reason;		/* enum afs_edit_dir_reason */
 898			mode_t	mode;
 899			const char *symlink;
 900		} create;
 901		struct {
 902			bool	need_rehash;
 903		} unlink;
 904		struct {
 905			struct dentry *rehash;
 906			struct dentry *tmp;
 907			bool	new_negative;
 908		} rename;
 909		struct {
 910			struct afs_read *req;
 911		} fetch;
 912		struct {
 913			afs_lock_type_t type;
 914		} lock;
 915		struct {
 916			struct iov_iter	*write_iter;
 917			loff_t	pos;
 918			loff_t	size;
 919			loff_t	i_size;
 
 920		} store;
 921		struct {
 922			struct iattr	*attr;
 923			loff_t		old_i_size;
 924		} setattr;
 925		struct afs_acl	*acl;
 926		struct yfs_acl	*yacl;
 927		struct {
 928			struct afs_volume_status vs;
 929			struct kstatfs		*buf;
 930		} volstatus;
 931	};
 932
 933	/* Fileserver iteration state */
 
 934	struct afs_server_list	*server_list;	/* Current server list (pins ref) */
 935	struct afs_server	*server;	/* Server we're using (ref pinned by server_list) */
 936	struct afs_endpoint_state *estate;	/* Current endpoint state (doesn't pin ref) */
 937	struct afs_server_state	*server_states;	/* States of the servers involved */
 938	struct afs_call		*call;
 939	unsigned long		untried_servers; /* Bitmask of untried servers */
 940	unsigned long		addr_tried;	/* Tried addresses */
 941	s32			call_abort_code; /* Abort code from single call */
 942	short			call_error;	/* Error from single call */
 943	short			server_index;	/* Current server */
 944	short			nr_iterations;	/* Number of server iterations */
 945	signed char		addr_index;	/* Current address */
 946	bool			call_responded;	/* T if the current address responded */
 947
 948	unsigned int		flags;
 949#define AFS_OPERATION_STOP		0x0001	/* Set to cease iteration */
 950#define AFS_OPERATION_VBUSY		0x0002	/* Set if seen VBUSY */
 951#define AFS_OPERATION_VMOVED		0x0004	/* Set if seen VMOVED */
 952#define AFS_OPERATION_VNOVOL		0x0008	/* Set if seen VNOVOL */
 953#define AFS_OPERATION_CUR_ONLY		0x0010	/* Set if current server only (file lock held) */
 954#define AFS_OPERATION_NO_VSLEEP		0x0020	/* Set to prevent sleep on VBUSY, VOFFLINE, ... */
 955#define AFS_OPERATION_UNINTR		0x0040	/* Set if op is uninterruptible */
 956#define AFS_OPERATION_DOWNGRADE		0x0080	/* Set to retry with downgraded opcode */
 957#define AFS_OPERATION_LOCK_0		0x0100	/* Set if have io_lock on file[0] */
 958#define AFS_OPERATION_LOCK_1		0x0200	/* Set if have io_lock on file[1] */
 959#define AFS_OPERATION_TRIED_ALL		0x0400	/* Set if we've tried all the fileservers */
 960#define AFS_OPERATION_RETRY_SERVER	0x0800	/* Set if we should retry the current server */
 961#define AFS_OPERATION_DIR_CONFLICT	0x1000	/* Set if we detected a 3rd-party dir change */
 962};
 963
 964/*
 965 * Cache auxiliary data.
 966 */
 967struct afs_vnode_cache_aux {
 968	__be64			data_version;
 969} __packed;
 970
 971static inline void afs_set_cache_aux(struct afs_vnode *vnode,
 972				     struct afs_vnode_cache_aux *aux)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 973{
 974	aux->data_version = cpu_to_be64(vnode->status.data_version);
 
 975}
 976
 977static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
 978{
 979	struct afs_vnode_cache_aux aux;
 980
 981	afs_set_cache_aux(vnode, &aux);
 982	fscache_invalidate(afs_vnode_cache(vnode), &aux,
 983			   i_size_read(&vnode->netfs.inode), flags);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 984}
 985
 986#include <trace/events/afs.h>
 987
 988/*****************************************************************************/
 989/*
 990 * addr_list.c
 991 */
 992struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
 993extern struct afs_addr_list *afs_alloc_addrlist(unsigned int nr);
 994extern void afs_put_addrlist(struct afs_addr_list *alist, enum afs_alist_trace reason);
 
 
 
 
 
 
 
 995extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
 996						      const char *, size_t, char,
 997						      unsigned short, unsigned short);
 998bool afs_addr_list_same(const struct afs_addr_list *a,
 999			const struct afs_addr_list *b);
1000extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
 
 
1001
1002extern int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *addr,
1003			      __be32 xdr, u16 port);
1004extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr,
1005			      __be32 *xdr, u16 port);
1006
1007/*
1008 * addr_prefs.c
1009 */
1010int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size);
1011void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist);
1012void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist);
 
 
 
 
 
 
 
1013
1014/*
1015 * callback.c
1016 */
1017extern void afs_invalidate_mmap_work(struct work_struct *);
1018extern void afs_init_callback_state(struct afs_server *);
1019extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1020extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
1021extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
1022
1023static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
1024{
1025	return vnode->cb_break + vnode->cb_ro_snapshot + vnode->cb_scrub;
1026}
1027
1028static inline bool afs_cb_is_broken(unsigned int cb_break,
1029				    const struct afs_vnode *vnode)
1030{
1031	return cb_break != (vnode->cb_break +
1032			    atomic_read(&vnode->volume->cb_ro_snapshot) +
1033			    atomic_read(&vnode->volume->cb_scrub));
1034}
1035
1036/*
1037 * cell.c
1038 */
1039extern int afs_cell_init(struct afs_net *, const char *);
1040extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1041				      enum afs_cell_trace);
1042extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1043					const char *, bool);
1044extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1045extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1046extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1047extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1048extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1049extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1050extern void afs_manage_cells(struct work_struct *);
1051extern void afs_cells_timer(struct timer_list *);
1052extern void __net_exit afs_cell_purge(struct afs_net *);
1053
1054/*
1055 * cmservice.c
1056 */
1057extern bool afs_cm_incoming_call(struct afs_call *);
1058
1059/*
1060 * dir.c
1061 */
1062extern const struct file_operations afs_dir_file_operations;
1063extern const struct inode_operations afs_dir_inode_operations;
1064extern const struct address_space_operations afs_dir_aops;
1065extern const struct dentry_operations afs_fs_dentry_operations;
1066
1067extern void afs_d_release(struct dentry *);
1068extern void afs_check_for_remote_deletion(struct afs_operation *);
1069
1070/*
1071 * dir_edit.c
1072 */
1073extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1074			     enum afs_edit_dir_reason);
1075extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1076void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
1077				enum afs_edit_dir_reason why);
1078
1079/*
1080 * dir_silly.c
1081 */
1082extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1083			   struct dentry *, struct key *);
1084extern int afs_silly_iput(struct dentry *, struct inode *);
1085
1086/*
1087 * dynroot.c
1088 */
1089extern const struct inode_operations afs_dynroot_inode_operations;
1090extern const struct dentry_operations afs_dynroot_dentry_operations;
1091
1092extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1093extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1094extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1095extern int afs_dynroot_populate(struct super_block *);
1096extern void afs_dynroot_depopulate(struct super_block *);
1097
1098/*
1099 * file.c
1100 */
1101extern const struct address_space_operations afs_file_aops;
1102extern const struct address_space_operations afs_symlink_aops;
1103extern const struct inode_operations afs_file_inode_operations;
1104extern const struct file_operations afs_file_operations;
1105extern const struct netfs_request_ops afs_req_ops;
1106
1107extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1108extern void afs_put_wb_key(struct afs_wb_key *);
1109extern int afs_open(struct inode *, struct file *);
1110extern int afs_release(struct inode *, struct file *);
1111extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
1112extern struct afs_read *afs_alloc_read(gfp_t);
1113extern void afs_put_read(struct afs_read *);
1114
1115static inline struct afs_read *afs_get_read(struct afs_read *req)
1116{
1117	refcount_inc(&req->usage);
1118	return req;
1119}
1120
1121/*
1122 * flock.c
1123 */
1124extern struct workqueue_struct *afs_lock_manager;
1125
1126extern void afs_lock_op_done(struct afs_call *);
1127extern void afs_lock_work(struct work_struct *);
1128extern void afs_lock_may_be_available(struct afs_vnode *);
1129extern int afs_lock(struct file *, int, struct file_lock *);
1130extern int afs_flock(struct file *, int, struct file_lock *);
1131
1132/*
1133 * fsclient.c
1134 */
1135extern void afs_fs_fetch_status(struct afs_operation *);
1136extern void afs_fs_fetch_data(struct afs_operation *);
1137extern void afs_fs_create_file(struct afs_operation *);
1138extern void afs_fs_make_dir(struct afs_operation *);
1139extern void afs_fs_remove_file(struct afs_operation *);
1140extern void afs_fs_remove_dir(struct afs_operation *);
1141extern void afs_fs_link(struct afs_operation *);
1142extern void afs_fs_symlink(struct afs_operation *);
1143extern void afs_fs_rename(struct afs_operation *);
1144extern void afs_fs_store_data(struct afs_operation *);
1145extern void afs_fs_setattr(struct afs_operation *);
1146extern void afs_fs_get_volume_status(struct afs_operation *);
1147extern void afs_fs_set_lock(struct afs_operation *);
1148extern void afs_fs_extend_lock(struct afs_operation *);
1149extern void afs_fs_release_lock(struct afs_operation *);
1150int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server,
1151				 struct afs_address *addr, struct key *key);
1152bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server,
1153			     struct afs_endpoint_state *estate, unsigned int addr_index,
1154			     struct key *key);
1155extern void afs_fs_inline_bulk_status(struct afs_operation *);
1156
1157struct afs_acl {
1158	u32	size;
1159	u8	data[] __counted_by(size);
1160};
1161
1162extern void afs_fs_fetch_acl(struct afs_operation *);
1163extern void afs_fs_store_acl(struct afs_operation *);
1164
1165/*
1166 * fs_operation.c
1167 */
1168extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1169extern int afs_put_operation(struct afs_operation *);
1170extern bool afs_begin_vnode_operation(struct afs_operation *);
1171extern void afs_wait_for_operation(struct afs_operation *);
1172extern int afs_do_sync_operation(struct afs_operation *);
1173
 
 
 
 
 
1174static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1175				    struct afs_vnode *vnode)
1176{
1177	op->file[n].vnode = vnode;
1178	op->file[n].need_io_lock = true;
1179}
1180
1181static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1182				  const struct afs_fid *fid)
1183{
1184	op->file[n].fid = *fid;
1185}
1186
1187/*
1188 * fs_probe.c
1189 */
1190struct afs_endpoint_state *afs_get_endpoint_state(struct afs_endpoint_state *estate,
1191						  enum afs_estate_trace where);
1192void afs_put_endpoint_state(struct afs_endpoint_state *estate, enum afs_estate_trace where);
1193extern void afs_fileserver_probe_result(struct afs_call *);
1194void afs_fs_probe_fileserver(struct afs_net *net, struct afs_server *server,
1195			     struct afs_addr_list *new_addrs, struct key *key);
1196int afs_wait_for_fs_probes(struct afs_operation *op, struct afs_server_state *states, bool intr);
1197extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1198extern void afs_fs_probe_dispatcher(struct work_struct *);
1199int afs_wait_for_one_fs_probe(struct afs_server *server, struct afs_endpoint_state *estate,
1200			      unsigned long exclude, bool is_intr);
1201extern void afs_fs_probe_cleanup(struct afs_net *);
1202
1203/*
1204 * inode.c
1205 */
1206extern const struct afs_operation_ops afs_fetch_status_operation;
1207
1208extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1209extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1210extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1211extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1212extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1213extern struct inode *afs_root_iget(struct super_block *, struct key *);
1214extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
 
 
1215		       struct kstat *, u32, unsigned int);
1216extern int afs_setattr(struct mnt_idmap *idmap, struct dentry *, struct iattr *);
1217extern void afs_evict_inode(struct inode *);
1218extern int afs_drop_inode(struct inode *);
1219
1220/*
1221 * main.c
1222 */
1223extern struct workqueue_struct *afs_wq;
1224extern int afs_net_id;
1225
1226static inline struct afs_net *afs_net(struct net *net)
1227{
1228	return net_generic(net, afs_net_id);
1229}
1230
1231static inline struct afs_net *afs_sb2net(struct super_block *sb)
1232{
1233	return afs_net(AFS_FS_S(sb)->net_ns);
1234}
1235
1236static inline struct afs_net *afs_d2net(struct dentry *dentry)
1237{
1238	return afs_sb2net(dentry->d_sb);
1239}
1240
1241static inline struct afs_net *afs_i2net(struct inode *inode)
1242{
1243	return afs_sb2net(inode->i_sb);
1244}
1245
1246static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1247{
1248	return afs_i2net(&vnode->netfs.inode);
1249}
1250
1251static inline struct afs_net *afs_sock2net(struct sock *sk)
1252{
1253	return net_generic(sock_net(sk), afs_net_id);
1254}
1255
1256static inline void __afs_stat(atomic_t *s)
1257{
1258	atomic_inc(s);
1259}
1260
1261#define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1262
1263/*
1264 * misc.c
1265 */
1266extern int afs_abort_to_error(u32);
1267extern void afs_prioritise_error(struct afs_error *, int, u32);
1268
1269static inline void afs_op_nomem(struct afs_operation *op)
1270{
1271	op->cumul_error.error = -ENOMEM;
1272}
1273
1274static inline int afs_op_error(const struct afs_operation *op)
1275{
1276	return op->cumul_error.error;
1277}
1278
1279static inline s32 afs_op_abort_code(const struct afs_operation *op)
1280{
1281	return op->cumul_error.abort_code;
1282}
1283
1284static inline int afs_op_set_error(struct afs_operation *op, int error)
1285{
1286	return op->cumul_error.error = error;
1287}
1288
1289static inline void afs_op_accumulate_error(struct afs_operation *op, int error, s32 abort_code)
1290{
1291	afs_prioritise_error(&op->cumul_error, error, abort_code);
1292}
1293
1294/*
1295 * mntpt.c
1296 */
1297extern const struct inode_operations afs_mntpt_inode_operations;
1298extern const struct inode_operations afs_autocell_inode_operations;
1299extern const struct file_operations afs_mntpt_file_operations;
1300
1301extern struct vfsmount *afs_d_automount(struct path *);
1302extern void afs_mntpt_kill_timer(void);
1303
1304/*
1305 * proc.c
1306 */
1307#ifdef CONFIG_PROC_FS
1308extern int __net_init afs_proc_init(struct afs_net *);
1309extern void __net_exit afs_proc_cleanup(struct afs_net *);
1310extern int afs_proc_cell_setup(struct afs_cell *);
1311extern void afs_proc_cell_remove(struct afs_cell *);
1312extern void afs_put_sysnames(struct afs_sysnames *);
1313#else
1314static inline int afs_proc_init(struct afs_net *net) { return 0; }
1315static inline void afs_proc_cleanup(struct afs_net *net) {}
1316static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
1317static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
1318static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1319#endif
1320
1321/*
1322 * rotate.c
1323 */
1324void afs_clear_server_states(struct afs_operation *op);
1325extern bool afs_select_fileserver(struct afs_operation *);
1326extern void afs_dump_edestaddrreq(const struct afs_operation *);
1327
1328/*
1329 * rxrpc.c
1330 */
1331extern struct workqueue_struct *afs_async_calls;
1332
1333extern int __net_init afs_open_socket(struct afs_net *);
1334extern void __net_exit afs_close_socket(struct afs_net *);
1335extern void afs_charge_preallocation(struct work_struct *);
1336extern void afs_put_call(struct afs_call *);
1337void afs_deferred_put_call(struct afs_call *call);
1338void afs_make_call(struct afs_call *call, gfp_t gfp);
1339void afs_wait_for_call_to_complete(struct afs_call *call);
1340extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1341					    const struct afs_call_type *,
1342					    size_t, size_t);
1343extern void afs_flat_call_destructor(struct afs_call *);
1344extern void afs_send_empty_reply(struct afs_call *);
1345extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1346extern int afs_extract_data(struct afs_call *, bool);
1347extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1348
1349static inline void afs_see_call(struct afs_call *call, enum afs_call_trace why)
1350{
1351	int r = refcount_read(&call->ref);
1352
1353	trace_afs_call(call->debug_id, why, r,
1354		       atomic_read(&call->net->nr_outstanding_calls),
1355		       __builtin_return_address(0));
1356}
1357
1358static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1359				    gfp_t gfp)
1360{
1361	struct afs_addr_list *alist = op->estate->addresses;
1362
1363	op->call	= call;
1364	op->type	= call->type;
1365	call->op	= op;
1366	call->key	= op->key;
1367	call->intr	= !(op->flags & AFS_OPERATION_UNINTR);
1368	call->peer	= rxrpc_kernel_get_peer(alist->addrs[op->addr_index].peer);
1369	call->service_id = op->server->service_id;
1370	afs_make_call(call, gfp);
1371}
1372
1373static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1374{
1375	call->iov_len = size;
1376	call->kvec[0].iov_base = buf;
1377	call->kvec[0].iov_len = size;
1378	iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1379}
1380
1381static inline void afs_extract_to_tmp(struct afs_call *call)
1382{
1383	call->iov_len = sizeof(call->tmp);
1384	afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1385}
1386
1387static inline void afs_extract_to_tmp64(struct afs_call *call)
1388{
1389	call->iov_len = sizeof(call->tmp64);
1390	afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1391}
1392
1393static inline void afs_extract_discard(struct afs_call *call, size_t size)
1394{
1395	call->iov_len = size;
1396	iov_iter_discard(&call->def_iter, ITER_DEST, size);
1397}
1398
1399static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1400{
1401	call->iov_len = size;
1402	afs_extract_begin(call, call->buffer, size);
1403}
1404
1405static inline int afs_transfer_reply(struct afs_call *call)
1406{
1407	return afs_extract_data(call, false);
1408}
1409
1410static inline bool afs_check_call_state(struct afs_call *call,
1411					enum afs_call_state state)
1412{
1413	return READ_ONCE(call->state) == state;
1414}
1415
1416static inline bool afs_set_call_state(struct afs_call *call,
1417				      enum afs_call_state from,
1418				      enum afs_call_state to)
1419{
1420	bool ok = false;
1421
1422	spin_lock_bh(&call->state_lock);
1423	if (call->state == from) {
1424		call->state = to;
1425		trace_afs_call_state(call, from, to, 0, 0);
1426		ok = true;
1427	}
1428	spin_unlock_bh(&call->state_lock);
1429	return ok;
1430}
1431
1432static inline void afs_set_call_complete(struct afs_call *call,
1433					 int error, u32 remote_abort)
1434{
1435	enum afs_call_state state;
1436	bool ok = false;
1437
1438	spin_lock_bh(&call->state_lock);
1439	state = call->state;
1440	if (state != AFS_CALL_COMPLETE) {
1441		call->abort_code = remote_abort;
1442		call->error = error;
1443		call->state = AFS_CALL_COMPLETE;
1444		trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1445				     error, remote_abort);
1446		ok = true;
1447	}
1448	spin_unlock_bh(&call->state_lock);
1449	if (ok) {
1450		trace_afs_call_done(call);
1451
1452		/* Asynchronous calls have two refs to release - one from the alloc and
1453		 * one queued with the work item - and we can't just deallocate the
1454		 * call because the work item may be queued again.
1455		 */
1456		if (call->drop_ref)
1457			afs_put_call(call);
1458	}
1459}
1460
1461/*
1462 * security.c
1463 */
1464extern void afs_put_permits(struct afs_permits *);
1465extern void afs_clear_permits(struct afs_vnode *);
1466extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1467			     struct afs_status_cb *);
 
1468extern struct key *afs_request_key(struct afs_cell *);
1469extern struct key *afs_request_key_rcu(struct afs_cell *);
1470extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1471extern int afs_permission(struct mnt_idmap *, struct inode *, int);
1472extern void __exit afs_clean_up_permit_cache(void);
1473
1474/*
1475 * server.c
1476 */
1477extern spinlock_t afs_server_peer_lock;
1478
1479extern struct afs_server *afs_find_server(struct afs_net *, const struct rxrpc_peer *);
 
1480extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1481extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1482extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1483extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1484extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1485extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1486extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1487extern void afs_manage_servers(struct work_struct *);
1488extern void afs_servers_timer(struct timer_list *);
1489extern void afs_fs_probe_timer(struct timer_list *);
1490extern void __net_exit afs_purge_servers(struct afs_net *);
1491bool afs_check_server_record(struct afs_operation *op, struct afs_server *server, struct key *key);
1492
1493static inline void afs_inc_servers_outstanding(struct afs_net *net)
1494{
1495	atomic_inc(&net->servers_outstanding);
1496}
1497
1498static inline void afs_dec_servers_outstanding(struct afs_net *net)
1499{
1500	if (atomic_dec_and_test(&net->servers_outstanding))
1501		wake_up_var(&net->servers_outstanding);
1502}
1503
1504static inline bool afs_is_probing_server(struct afs_server *server)
1505{
1506	return list_empty(&server->probe_link);
1507}
1508
1509/*
1510 * server_list.c
1511 */
1512static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1513{
1514	refcount_inc(&slist->usage);
1515	return slist;
1516}
1517
1518extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1519struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume,
1520					      struct key *key,
1521					      struct afs_vldb_entry *vldb);
1522extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1523void afs_attach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist);
1524void afs_reattach_volume_to_servers(struct afs_volume *volume, struct afs_server_list *slist,
1525				    struct afs_server_list *old);
1526void afs_detach_volume_from_servers(struct afs_volume *volume, struct afs_server_list *slist);
1527
1528/*
1529 * super.c
1530 */
1531extern int __init afs_fs_init(void);
1532extern void afs_fs_exit(void);
1533
1534/*
1535 * validation.c
1536 */
1537bool afs_check_validity(const struct afs_vnode *vnode);
1538int afs_update_volume_state(struct afs_operation *op);
1539int afs_validate(struct afs_vnode *vnode, struct key *key);
1540
1541/*
1542 * vlclient.c
1543 */
1544extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1545							 const char *, int);
1546extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1547struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
1548					 struct afs_addr_list *alist,
1549					 unsigned int addr_index,
1550					 struct key *key,
1551					 struct afs_vlserver *server,
1552					 unsigned int server_index);
1553extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1554extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1555
1556/*
1557 * vl_alias.c
1558 */
1559extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1560
1561/*
1562 * vl_probe.c
1563 */
1564extern void afs_vlserver_probe_result(struct afs_call *);
1565extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1566extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1567
1568/*
1569 * vl_rotate.c
1570 */
1571extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1572					 struct afs_cell *, struct key *);
1573extern bool afs_select_vlserver(struct afs_vl_cursor *);
1574extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1575extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1576
1577/*
1578 * vlserver_list.c
1579 */
1580static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1581{
1582	refcount_inc(&vlserver->ref);
1583	return vlserver;
1584}
1585
1586static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1587{
1588	if (vllist)
1589		refcount_inc(&vllist->ref);
1590	return vllist;
1591}
1592
1593extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1594extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1595extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1596extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1597extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1598							   const void *, size_t);
1599
1600/*
1601 * volume.c
1602 */
1603extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1604extern int afs_activate_volume(struct afs_volume *);
1605extern void afs_deactivate_volume(struct afs_volume *);
1606bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1607extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1608void afs_put_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1609extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1610
1611/*
1612 * write.c
1613 */
1614void afs_prepare_write(struct netfs_io_subrequest *subreq);
1615void afs_issue_write(struct netfs_io_subrequest *subreq);
1616void afs_begin_writeback(struct netfs_io_request *wreq);
1617void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream);
 
 
 
 
1618extern int afs_writepages(struct address_space *, struct writeback_control *);
 
1619extern int afs_fsync(struct file *, loff_t, loff_t, int);
1620extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1621extern void afs_prune_wb_keys(struct afs_vnode *);
 
1622
1623/*
1624 * xattr.c
1625 */
1626extern const struct xattr_handler * const afs_xattr_handlers[];
1627
1628/*
1629 * yfsclient.c
1630 */
1631extern void yfs_fs_fetch_data(struct afs_operation *);
1632extern void yfs_fs_create_file(struct afs_operation *);
1633extern void yfs_fs_make_dir(struct afs_operation *);
1634extern void yfs_fs_remove_file2(struct afs_operation *);
1635extern void yfs_fs_remove_file(struct afs_operation *);
1636extern void yfs_fs_remove_dir(struct afs_operation *);
1637extern void yfs_fs_link(struct afs_operation *);
1638extern void yfs_fs_symlink(struct afs_operation *);
1639extern void yfs_fs_rename(struct afs_operation *);
1640extern void yfs_fs_store_data(struct afs_operation *);
1641extern void yfs_fs_setattr(struct afs_operation *);
1642extern void yfs_fs_get_volume_status(struct afs_operation *);
1643extern void yfs_fs_set_lock(struct afs_operation *);
1644extern void yfs_fs_extend_lock(struct afs_operation *);
1645extern void yfs_fs_release_lock(struct afs_operation *);
1646extern void yfs_fs_fetch_status(struct afs_operation *);
1647extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1648
1649struct yfs_acl {
1650	struct afs_acl	*acl;		/* Dir/file/symlink ACL */
1651	struct afs_acl	*vol_acl;	/* Whole volume ACL */
1652	u32		inherit_flag;	/* True if ACL is inherited from parent dir */
1653	u32		num_cleaned;	/* Number of ACEs removed due to subject removal */
1654	unsigned int	flags;
1655#define YFS_ACL_WANT_ACL	0x01	/* Set if caller wants ->acl */
1656#define YFS_ACL_WANT_VOL_ACL	0x02	/* Set if caller wants ->vol_acl */
1657};
1658
1659extern void yfs_free_opaque_acl(struct yfs_acl *);
1660extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1661extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1662
1663/*
1664 * Miscellaneous inline functions.
1665 */
1666static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1667{
1668	return container_of(inode, struct afs_vnode, netfs.inode);
1669}
1670
1671static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1672{
1673	return &vnode->netfs.inode;
1674}
1675
1676/*
1677 * Note that a dentry got changed.  We need to set d_fsdata to the data version
1678 * number derived from the result of the operation.  It doesn't matter if
1679 * d_fsdata goes backwards as we'll just revalidate.
1680 */
1681static inline void afs_update_dentry_version(struct afs_operation *op,
1682					     struct afs_vnode_param *dir_vp,
1683					     struct dentry *dentry)
1684{
1685	if (!op->cumul_error.error)
1686		dentry->d_fsdata =
1687			(void *)(unsigned long)dir_vp->scb.status.data_version;
1688}
1689
1690/*
1691 * Set the file size and block count.  Estimate the number of 512 bytes blocks
1692 * used, rounded up to nearest 1K for consistency with other AFS clients.
1693 */
1694static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1695{
1696	i_size_write(&vnode->netfs.inode, size);
1697	vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1698}
1699
1700/*
1701 * Check for a conflicting operation on a directory that we just unlinked from.
1702 * If someone managed to sneak a link or an unlink in on the file we just
1703 * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1704 */
1705static inline void afs_check_dir_conflict(struct afs_operation *op,
1706					  struct afs_vnode_param *dvp)
1707{
1708	if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1709		op->flags |= AFS_OPERATION_DIR_CONFLICT;
1710}
1711
1712static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1713{
1714	trace_afs_io_error(call->debug_id, -EIO, where);
1715	return -EIO;
1716}
1717
1718static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1719{
1720	trace_afs_file_error(vnode, -EIO, where);
1721	return -EIO;
1722}
1723
1724/*****************************************************************************/
1725/*
1726 * debug tracing
1727 */
1728extern unsigned afs_debug;
1729
1730#define dbgprintk(FMT,...) \
1731	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1732
1733#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1734#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1735#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1736
1737
1738#if defined(__KDEBUG)
1739#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1740#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1741#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1742
1743#elif defined(CONFIG_AFS_DEBUG)
1744#define AFS_DEBUG_KENTER	0x01
1745#define AFS_DEBUG_KLEAVE	0x02
1746#define AFS_DEBUG_KDEBUG	0x04
1747
1748#define _enter(FMT,...)					\
1749do {							\
1750	if (unlikely(afs_debug & AFS_DEBUG_KENTER))	\
1751		kenter(FMT,##__VA_ARGS__);		\
1752} while (0)
1753
1754#define _leave(FMT,...)					\
1755do {							\
1756	if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))	\
1757		kleave(FMT,##__VA_ARGS__);		\
1758} while (0)
1759
1760#define _debug(FMT,...)					\
1761do {							\
1762	if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))	\
1763		kdebug(FMT,##__VA_ARGS__);		\
1764} while (0)
1765
1766#else
1767#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1768#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1769#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1770#endif
1771
1772/*
1773 * debug assertion checking
1774 */
1775#if 1 // defined(__KDEBUGALL)
1776
1777#define ASSERT(X)						\
1778do {								\
1779	if (unlikely(!(X))) {					\
1780		printk(KERN_ERR "\n");				\
1781		printk(KERN_ERR "AFS: Assertion failed\n");	\
1782		BUG();						\
1783	}							\
1784} while(0)
1785
1786#define ASSERTCMP(X, OP, Y)						\
1787do {									\
1788	if (unlikely(!((X) OP (Y)))) {					\
1789		printk(KERN_ERR "\n");					\
1790		printk(KERN_ERR "AFS: Assertion failed\n");		\
1791		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
1792		       (unsigned long)(X), (unsigned long)(Y));		\
1793		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
1794		       (unsigned long)(X), (unsigned long)(Y));		\
1795		BUG();							\
1796	}								\
1797} while(0)
1798
1799#define ASSERTRANGE(L, OP1, N, OP2, H)					\
1800do {									\
1801	if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {		\
1802		printk(KERN_ERR "\n");					\
1803		printk(KERN_ERR "AFS: Assertion failed\n");		\
1804		printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n",	\
1805		       (unsigned long)(L), (unsigned long)(N),		\
1806		       (unsigned long)(H));				\
1807		printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1808		       (unsigned long)(L), (unsigned long)(N),		\
1809		       (unsigned long)(H));				\
1810		BUG();							\
1811	}								\
1812} while(0)
1813
1814#define ASSERTIF(C, X)						\
1815do {								\
1816	if (unlikely((C) && !(X))) {				\
1817		printk(KERN_ERR "\n");				\
1818		printk(KERN_ERR "AFS: Assertion failed\n");	\
1819		BUG();						\
1820	}							\
1821} while(0)
1822
1823#define ASSERTIFCMP(C, X, OP, Y)					\
1824do {									\
1825	if (unlikely((C) && !((X) OP (Y)))) {				\
1826		printk(KERN_ERR "\n");					\
1827		printk(KERN_ERR "AFS: Assertion failed\n");		\
1828		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
1829		       (unsigned long)(X), (unsigned long)(Y));		\
1830		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
1831		       (unsigned long)(X), (unsigned long)(Y));		\
1832		BUG();							\
1833	}								\
1834} while(0)
1835
1836#else
1837
1838#define ASSERT(X)				\
1839do {						\
1840} while(0)
1841
1842#define ASSERTCMP(X, OP, Y)			\
1843do {						\
1844} while(0)
1845
1846#define ASSERTRANGE(L, OP1, N, OP2, H)		\
1847do {						\
1848} while(0)
1849
1850#define ASSERTIF(C, X)				\
1851do {						\
1852} while(0)
1853
1854#define ASSERTIFCMP(C, X, OP, Y)		\
1855do {						\
1856} while(0)
1857
1858#endif /* __KDEBUGALL */