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1  /* SPDX-License-Identifier: GPL-2.0-or-later */
2  /* internal AFS stuff
3   *
4   * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
5   * Written by David Howells (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  	refcount_t		ref;
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  	refcount_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  	refcount_t		ref;
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  	refcount_t		ref;
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  	refcount_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  	struct rcu_head		rcu;
556  	afs_volid_t		vids[AFS_MAXTYPES]; /* Volume IDs */
557  	refcount_t		usage;
558  	unsigned char		nr_servers;
559  	unsigned char		preferred;	/* Preferred server */
560  	unsigned short		vnovol_mask;	/* Servers to be skipped due to VNOVOL */
561  	unsigned int		seq;		/* Set to ->servers_seq when installed */
562  	rwlock_t		lock;
563  	struct afs_server_entry	servers[];
564  };
565  
566  /*
567   * Live AFS volume management.
568   */
569  struct afs_volume {
570  	union {
571  		struct rcu_head	rcu;
572  		afs_volid_t	vid;		/* volume ID */
573  	};
574  	refcount_t		ref;
575  	time64_t		update_at;	/* Time at which to next update */
576  	struct afs_cell		*cell;		/* Cell to which belongs (pins ref) */
577  	struct rb_node		cell_node;	/* Link in cell->volumes */
578  	struct hlist_node	proc_link;	/* Link in cell->proc_volumes */
579  	struct super_block __rcu *sb;		/* Superblock on which inodes reside */
580  	unsigned long		flags;
581  #define AFS_VOLUME_NEEDS_UPDATE	0	/* - T if an update needs performing */
582  #define AFS_VOLUME_UPDATING	1	/* - T if an update is in progress */
583  #define AFS_VOLUME_WAIT		2	/* - T if users must wait for update */
584  #define AFS_VOLUME_DELETED	3	/* - T if volume appears deleted */
585  #define AFS_VOLUME_OFFLINE	4	/* - T if volume offline notice given */
586  #define AFS_VOLUME_BUSY		5	/* - T if volume busy notice given */
587  #define AFS_VOLUME_MAYBE_NO_IBULK 6	/* - T if some servers don't have InlineBulkStatus */
588  #define AFS_VOLUME_RM_TREE	7	/* - Set if volume removed from cell->volumes */
589  #ifdef CONFIG_AFS_FSCACHE
590  	struct fscache_volume	*cache;		/* Caching cookie */
591  #endif
592  	struct afs_server_list __rcu *servers;	/* List of servers on which volume resides */
593  	rwlock_t		servers_lock;	/* Lock for ->servers */
594  	unsigned int		servers_seq;	/* Incremented each time ->servers changes */
595  
596  	unsigned		cb_v_break;	/* Break-everything counter. */
597  	rwlock_t		cb_v_break_lock;
598  
599  	afs_voltype_t		type;		/* type of volume */
600  	char			type_force;	/* force volume type (suppress R/O -> R/W) */
601  	u8			name_len;
602  	u8			name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
603  };
604  
605  enum afs_lock_state {
606  	AFS_VNODE_LOCK_NONE,		/* The vnode has no lock on the server */
607  	AFS_VNODE_LOCK_WAITING_FOR_CB,	/* We're waiting for the server to break the callback */
608  	AFS_VNODE_LOCK_SETTING,		/* We're asking the server for a lock */
609  	AFS_VNODE_LOCK_GRANTED,		/* We have a lock on the server */
610  	AFS_VNODE_LOCK_EXTENDING,	/* We're extending a lock on the server */
611  	AFS_VNODE_LOCK_NEED_UNLOCK,	/* We need to unlock on the server */
612  	AFS_VNODE_LOCK_UNLOCKING,	/* We're telling the server to unlock */
613  	AFS_VNODE_LOCK_DELETED,		/* The vnode has been deleted whilst we have a lock */
614  };
615  
616  /*
617   * AFS inode private data.
618   *
619   * Note that afs_alloc_inode() *must* reset anything that could incorrectly
620   * leak from one inode to another.
621   */
622  struct afs_vnode {
623  	struct netfs_inode	netfs;		/* Netfslib context and vfs inode */
624  	struct afs_volume	*volume;	/* volume on which vnode resides */
625  	struct afs_fid		fid;		/* the file identifier for this inode */
626  	struct afs_file_status	status;		/* AFS status info for this file */
627  	afs_dataversion_t	invalid_before;	/* Child dentries are invalid before this */
628  	struct afs_permits __rcu *permit_cache;	/* cache of permits so far obtained */
629  	struct mutex		io_lock;	/* Lock for serialising I/O on this mutex */
630  	struct rw_semaphore	validate_lock;	/* lock for validating this vnode */
631  	struct rw_semaphore	rmdir_lock;	/* Lock for rmdir vs sillyrename */
632  	struct key		*silly_key;	/* Silly rename key */
633  	spinlock_t		wb_lock;	/* lock for wb_keys */
634  	spinlock_t		lock;		/* waitqueue/flags lock */
635  	unsigned long		flags;
636  #define AFS_VNODE_CB_PROMISED	0		/* Set if vnode has a callback promise */
637  #define AFS_VNODE_UNSET		1		/* set if vnode attributes not yet set */
638  #define AFS_VNODE_DIR_VALID	2		/* Set if dir contents are valid */
639  #define AFS_VNODE_ZAP_DATA	3		/* set if vnode's data should be invalidated */
640  #define AFS_VNODE_DELETED	4		/* set if vnode deleted on server */
641  #define AFS_VNODE_MOUNTPOINT	5		/* set if vnode is a mountpoint symlink */
642  #define AFS_VNODE_AUTOCELL	6		/* set if Vnode is an auto mount point */
643  #define AFS_VNODE_PSEUDODIR	7 		/* set if Vnode is a pseudo directory */
644  #define AFS_VNODE_NEW_CONTENT	8		/* Set if file has new content (create/trunc-0) */
645  #define AFS_VNODE_SILLY_DELETED	9		/* Set if file has been silly-deleted */
646  #define AFS_VNODE_MODIFYING	10		/* Set if we're performing a modification op */
647  
648  	struct list_head	wb_keys;	/* List of keys available for writeback */
649  	struct list_head	pending_locks;	/* locks waiting to be granted */
650  	struct list_head	granted_locks;	/* locks granted on this file */
651  	struct delayed_work	lock_work;	/* work to be done in locking */
652  	struct key		*lock_key;	/* Key to be used in lock ops */
653  	ktime_t			locked_at;	/* Time at which lock obtained */
654  	enum afs_lock_state	lock_state : 8;
655  	afs_lock_type_t		lock_type : 8;
656  
657  	/* outstanding callback notification on this file */
658  	struct work_struct	cb_work;	/* Work for mmap'd files */
659  	struct list_head	cb_mmap_link;	/* Link in cell->fs_open_mmaps */
660  	void			*cb_server;	/* Server with callback/filelock */
661  	atomic_t		cb_nr_mmap;	/* Number of mmaps */
662  	unsigned int		cb_fs_s_break;	/* Mass server break counter (cell->fs_s_break) */
663  	unsigned int		cb_s_break;	/* Mass break counter on ->server */
664  	unsigned int		cb_v_break;	/* Mass break counter on ->volume */
665  	unsigned int		cb_break;	/* Break counter on vnode */
666  	seqlock_t		cb_lock;	/* Lock for ->cb_server, ->status, ->cb_*break */
667  
668  	time64_t		cb_expires_at;	/* time at which callback expires */
669  };
670  
afs_vnode_cache(struct afs_vnode * vnode)671  static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
672  {
673  #ifdef CONFIG_AFS_FSCACHE
674  	return netfs_i_cookie(&vnode->netfs);
675  #else
676  	return NULL;
677  #endif
678  }
679  
afs_vnode_set_cache(struct afs_vnode * vnode,struct fscache_cookie * cookie)680  static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
681  				       struct fscache_cookie *cookie)
682  {
683  #ifdef CONFIG_AFS_FSCACHE
684  	vnode->netfs.cache = cookie;
685  	if (cookie)
686  		mapping_set_release_always(vnode->netfs.inode.i_mapping);
687  #endif
688  }
689  
690  /*
691   * cached security record for one user's attempt to access a vnode
692   */
693  struct afs_permit {
694  	struct key		*key;		/* RxRPC ticket holding a security context */
695  	afs_access_t		access;		/* CallerAccess value for this key */
696  };
697  
698  /*
699   * Immutable cache of CallerAccess records from attempts to access vnodes.
700   * These may be shared between multiple vnodes.
701   */
702  struct afs_permits {
703  	struct rcu_head		rcu;
704  	struct hlist_node	hash_node;	/* Link in hash */
705  	unsigned long		h;		/* Hash value for this permit list */
706  	refcount_t		usage;
707  	unsigned short		nr_permits;	/* Number of records */
708  	bool			invalidated;	/* Invalidated due to key change */
709  	struct afs_permit	permits[];	/* List of permits sorted by key pointer */
710  };
711  
712  /*
713   * Error prioritisation and accumulation.
714   */
715  struct afs_error {
716  	short	error;			/* Accumulated error */
717  	bool	responded;		/* T if server responded */
718  };
719  
720  /*
721   * Cursor for iterating over a server's address list.
722   */
723  struct afs_addr_cursor {
724  	struct afs_addr_list	*alist;		/* Current address list (pins ref) */
725  	unsigned long		tried;		/* Tried addresses */
726  	signed char		index;		/* Current address */
727  	bool			responded;	/* T if the current address responded */
728  	unsigned short		nr_iterations;	/* Number of address iterations */
729  	short			error;
730  	u32			abort_code;
731  };
732  
733  /*
734   * Cursor for iterating over a set of volume location servers.
735   */
736  struct afs_vl_cursor {
737  	struct afs_addr_cursor	ac;
738  	struct afs_cell		*cell;		/* The cell we're querying */
739  	struct afs_vlserver_list *server_list;	/* Current server list (pins ref) */
740  	struct afs_vlserver	*server;	/* Server on which this resides */
741  	struct key		*key;		/* Key for the server */
742  	unsigned long		untried;	/* Bitmask of untried servers */
743  	short			index;		/* Current server */
744  	short			error;
745  	unsigned short		flags;
746  #define AFS_VL_CURSOR_STOP	0x0001		/* Set to cease iteration */
747  #define AFS_VL_CURSOR_RETRY	0x0002		/* Set to do a retry */
748  #define AFS_VL_CURSOR_RETRIED	0x0004		/* Set if started a retry */
749  	unsigned short		nr_iterations;	/* Number of server iterations */
750  };
751  
752  /*
753   * Fileserver operation methods.
754   */
755  struct afs_operation_ops {
756  	void (*issue_afs_rpc)(struct afs_operation *op);
757  	void (*issue_yfs_rpc)(struct afs_operation *op);
758  	void (*success)(struct afs_operation *op);
759  	void (*aborted)(struct afs_operation *op);
760  	void (*failed)(struct afs_operation *op);
761  	void (*edit_dir)(struct afs_operation *op);
762  	void (*put)(struct afs_operation *op);
763  };
764  
765  struct afs_vnode_param {
766  	struct afs_vnode	*vnode;
767  	struct afs_fid		fid;		/* Fid to access */
768  	struct afs_status_cb	scb;		/* Returned status and callback promise */
769  	afs_dataversion_t	dv_before;	/* Data version before the call */
770  	unsigned int		cb_break_before; /* cb_break + cb_s_break before the call */
771  	u8			dv_delta;	/* Expected change in data version */
772  	bool			put_vnode:1;	/* T if we have a ref on the vnode */
773  	bool			need_io_lock:1;	/* T if we need the I/O lock on this */
774  	bool			update_ctime:1;	/* Need to update the ctime */
775  	bool			set_size:1;	/* Must update i_size */
776  	bool			op_unlinked:1;	/* True if file was unlinked by op */
777  	bool			speculative:1;	/* T if speculative status fetch (no vnode lock) */
778  	bool			modification:1;	/* Set if the content gets modified */
779  };
780  
781  /*
782   * Fileserver operation wrapper, handling server and address rotation
783   * asynchronously.  May make simultaneous calls to multiple servers.
784   */
785  struct afs_operation {
786  	struct afs_net		*net;		/* Network namespace */
787  	struct key		*key;		/* Key for the cell */
788  	const struct afs_call_type *type;	/* Type of call done */
789  	const struct afs_operation_ops *ops;
790  
791  	/* Parameters/results for the operation */
792  	struct afs_volume	*volume;	/* Volume being accessed */
793  	struct afs_vnode_param	file[2];
794  	struct afs_vnode_param	*more_files;
795  	struct afs_volsync	volsync;
796  	struct dentry		*dentry;	/* Dentry to be altered */
797  	struct dentry		*dentry_2;	/* Second dentry to be altered */
798  	struct timespec64	mtime;		/* Modification time to record */
799  	struct timespec64	ctime;		/* Change time to set */
800  	short			nr_files;	/* Number of entries in file[], more_files */
801  	short			error;
802  	unsigned int		debug_id;
803  
804  	unsigned int		cb_v_break;	/* Volume break counter before op */
805  	unsigned int		cb_s_break;	/* Server break counter before op */
806  
807  	union {
808  		struct {
809  			int	which;		/* Which ->file[] to fetch for */
810  		} fetch_status;
811  		struct {
812  			int	reason;		/* enum afs_edit_dir_reason */
813  			mode_t	mode;
814  			const char *symlink;
815  		} create;
816  		struct {
817  			bool	need_rehash;
818  		} unlink;
819  		struct {
820  			struct dentry *rehash;
821  			struct dentry *tmp;
822  			bool	new_negative;
823  		} rename;
824  		struct {
825  			struct afs_read *req;
826  		} fetch;
827  		struct {
828  			afs_lock_type_t type;
829  		} lock;
830  		struct {
831  			struct iov_iter	*write_iter;
832  			loff_t	pos;
833  			loff_t	size;
834  			loff_t	i_size;
835  			bool	laundering;	/* Laundering page, PG_writeback not set */
836  		} store;
837  		struct {
838  			struct iattr	*attr;
839  			loff_t		old_i_size;
840  		} setattr;
841  		struct afs_acl	*acl;
842  		struct yfs_acl	*yacl;
843  		struct {
844  			struct afs_volume_status vs;
845  			struct kstatfs		*buf;
846  		} volstatus;
847  	};
848  
849  	/* Fileserver iteration state */
850  	struct afs_addr_cursor	ac;
851  	struct afs_server_list	*server_list;	/* Current server list (pins ref) */
852  	struct afs_server	*server;	/* Server we're using (ref pinned by server_list) */
853  	struct afs_call		*call;
854  	unsigned long		untried;	/* Bitmask of untried servers */
855  	short			index;		/* Current server */
856  	unsigned short		nr_iterations;	/* Number of server iterations */
857  
858  	unsigned int		flags;
859  #define AFS_OPERATION_STOP		0x0001	/* Set to cease iteration */
860  #define AFS_OPERATION_VBUSY		0x0002	/* Set if seen VBUSY */
861  #define AFS_OPERATION_VMOVED		0x0004	/* Set if seen VMOVED */
862  #define AFS_OPERATION_VNOVOL		0x0008	/* Set if seen VNOVOL */
863  #define AFS_OPERATION_CUR_ONLY		0x0010	/* Set if current server only (file lock held) */
864  #define AFS_OPERATION_NO_VSLEEP		0x0020	/* Set to prevent sleep on VBUSY, VOFFLINE, ... */
865  #define AFS_OPERATION_UNINTR		0x0040	/* Set if op is uninterruptible */
866  #define AFS_OPERATION_DOWNGRADE		0x0080	/* Set to retry with downgraded opcode */
867  #define AFS_OPERATION_LOCK_0		0x0100	/* Set if have io_lock on file[0] */
868  #define AFS_OPERATION_LOCK_1		0x0200	/* Set if have io_lock on file[1] */
869  #define AFS_OPERATION_TRIED_ALL		0x0400	/* Set if we've tried all the fileservers */
870  #define AFS_OPERATION_RETRY_SERVER	0x0800	/* Set if we should retry the current server */
871  #define AFS_OPERATION_DIR_CONFLICT	0x1000	/* Set if we detected a 3rd-party dir change */
872  };
873  
874  /*
875   * Cache auxiliary data.
876   */
877  struct afs_vnode_cache_aux {
878  	__be64			data_version;
879  } __packed;
880  
afs_set_cache_aux(struct afs_vnode * vnode,struct afs_vnode_cache_aux * aux)881  static inline void afs_set_cache_aux(struct afs_vnode *vnode,
882  				     struct afs_vnode_cache_aux *aux)
883  {
884  	aux->data_version = cpu_to_be64(vnode->status.data_version);
885  }
886  
afs_invalidate_cache(struct afs_vnode * vnode,unsigned int flags)887  static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
888  {
889  	struct afs_vnode_cache_aux aux;
890  
891  	afs_set_cache_aux(vnode, &aux);
892  	fscache_invalidate(afs_vnode_cache(vnode), &aux,
893  			   i_size_read(&vnode->netfs.inode), flags);
894  }
895  
896  /*
897   * We use folio->private to hold the amount of the folio that we've written to,
898   * splitting the field into two parts.  However, we need to represent a range
899   * 0...FOLIO_SIZE, so we reduce the resolution if the size of the folio
900   * exceeds what we can encode.
901   */
902  #ifdef CONFIG_64BIT
903  #define __AFS_FOLIO_PRIV_MASK		0x7fffffffUL
904  #define __AFS_FOLIO_PRIV_SHIFT		32
905  #define __AFS_FOLIO_PRIV_MMAPPED	0x80000000UL
906  #else
907  #define __AFS_FOLIO_PRIV_MASK		0x7fffUL
908  #define __AFS_FOLIO_PRIV_SHIFT		16
909  #define __AFS_FOLIO_PRIV_MMAPPED	0x8000UL
910  #endif
911  
afs_folio_dirty_resolution(struct folio * folio)912  static inline unsigned int afs_folio_dirty_resolution(struct folio *folio)
913  {
914  	int shift = folio_shift(folio) - (__AFS_FOLIO_PRIV_SHIFT - 1);
915  	return (shift > 0) ? shift : 0;
916  }
917  
afs_folio_dirty_from(struct folio * folio,unsigned long priv)918  static inline size_t afs_folio_dirty_from(struct folio *folio, unsigned long priv)
919  {
920  	unsigned long x = priv & __AFS_FOLIO_PRIV_MASK;
921  
922  	/* The lower bound is inclusive */
923  	return x << afs_folio_dirty_resolution(folio);
924  }
925  
afs_folio_dirty_to(struct folio * folio,unsigned long priv)926  static inline size_t afs_folio_dirty_to(struct folio *folio, unsigned long priv)
927  {
928  	unsigned long x = (priv >> __AFS_FOLIO_PRIV_SHIFT) & __AFS_FOLIO_PRIV_MASK;
929  
930  	/* The upper bound is immediately beyond the region */
931  	return (x + 1) << afs_folio_dirty_resolution(folio);
932  }
933  
afs_folio_dirty(struct folio * folio,size_t from,size_t to)934  static inline unsigned long afs_folio_dirty(struct folio *folio, size_t from, size_t to)
935  {
936  	unsigned int res = afs_folio_dirty_resolution(folio);
937  	from >>= res;
938  	to = (to - 1) >> res;
939  	return (to << __AFS_FOLIO_PRIV_SHIFT) | from;
940  }
941  
afs_folio_dirty_mmapped(unsigned long priv)942  static inline unsigned long afs_folio_dirty_mmapped(unsigned long priv)
943  {
944  	return priv | __AFS_FOLIO_PRIV_MMAPPED;
945  }
946  
afs_is_folio_dirty_mmapped(unsigned long priv)947  static inline bool afs_is_folio_dirty_mmapped(unsigned long priv)
948  {
949  	return priv & __AFS_FOLIO_PRIV_MMAPPED;
950  }
951  
952  #include <trace/events/afs.h>
953  
954  /*****************************************************************************/
955  /*
956   * addr_list.c
957   */
afs_get_addrlist(struct afs_addr_list * alist)958  static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
959  {
960  	if (alist)
961  		refcount_inc(&alist->usage);
962  	return alist;
963  }
964  extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
965  						unsigned short,
966  						unsigned short);
967  extern void afs_put_addrlist(struct afs_addr_list *);
968  extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
969  						      const char *, size_t, char,
970  						      unsigned short, unsigned short);
971  extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
972  extern bool afs_iterate_addresses(struct afs_addr_cursor *);
973  extern int afs_end_cursor(struct afs_addr_cursor *);
974  
975  extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
976  extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
977  
978  /*
979   * cache.c
980   */
981  #ifdef CONFIG_AFS_FSCACHE
982  extern struct fscache_netfs afs_cache_netfs;
983  #endif
984  
985  /*
986   * callback.c
987   */
988  extern void afs_invalidate_mmap_work(struct work_struct *);
989  extern void afs_server_init_callback_work(struct work_struct *work);
990  extern void afs_init_callback_state(struct afs_server *);
991  extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
992  extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
993  extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
994  
afs_calc_vnode_cb_break(struct afs_vnode * vnode)995  static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
996  {
997  	return vnode->cb_break + vnode->cb_v_break;
998  }
999  
afs_cb_is_broken(unsigned int cb_break,const struct afs_vnode * vnode)1000  static inline bool afs_cb_is_broken(unsigned int cb_break,
1001  				    const struct afs_vnode *vnode)
1002  {
1003  	return cb_break != (vnode->cb_break + vnode->volume->cb_v_break);
1004  }
1005  
1006  /*
1007   * cell.c
1008   */
1009  extern int afs_cell_init(struct afs_net *, const char *);
1010  extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
1011  				      enum afs_cell_trace);
1012  extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
1013  					const char *, bool);
1014  extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
1015  extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
1016  extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
1017  extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
1018  extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
1019  extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
1020  extern void afs_manage_cells(struct work_struct *);
1021  extern void afs_cells_timer(struct timer_list *);
1022  extern void __net_exit afs_cell_purge(struct afs_net *);
1023  
1024  /*
1025   * cmservice.c
1026   */
1027  extern bool afs_cm_incoming_call(struct afs_call *);
1028  
1029  /*
1030   * dir.c
1031   */
1032  extern const struct file_operations afs_dir_file_operations;
1033  extern const struct inode_operations afs_dir_inode_operations;
1034  extern const struct address_space_operations afs_dir_aops;
1035  extern const struct dentry_operations afs_fs_dentry_operations;
1036  
1037  extern void afs_d_release(struct dentry *);
1038  extern void afs_check_for_remote_deletion(struct afs_operation *);
1039  
1040  /*
1041   * dir_edit.c
1042   */
1043  extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
1044  			     enum afs_edit_dir_reason);
1045  extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
1046  
1047  /*
1048   * dir_silly.c
1049   */
1050  extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
1051  			   struct dentry *, struct key *);
1052  extern int afs_silly_iput(struct dentry *, struct inode *);
1053  
1054  /*
1055   * dynroot.c
1056   */
1057  extern const struct inode_operations afs_dynroot_inode_operations;
1058  extern const struct dentry_operations afs_dynroot_dentry_operations;
1059  
1060  extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
1061  extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
1062  extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
1063  extern int afs_dynroot_populate(struct super_block *);
1064  extern void afs_dynroot_depopulate(struct super_block *);
1065  
1066  /*
1067   * file.c
1068   */
1069  extern const struct address_space_operations afs_file_aops;
1070  extern const struct address_space_operations afs_symlink_aops;
1071  extern const struct inode_operations afs_file_inode_operations;
1072  extern const struct file_operations afs_file_operations;
1073  extern const struct netfs_request_ops afs_req_ops;
1074  
1075  extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
1076  extern void afs_put_wb_key(struct afs_wb_key *);
1077  extern int afs_open(struct inode *, struct file *);
1078  extern int afs_release(struct inode *, struct file *);
1079  extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
1080  extern struct afs_read *afs_alloc_read(gfp_t);
1081  extern void afs_put_read(struct afs_read *);
1082  extern int afs_write_inode(struct inode *, struct writeback_control *);
1083  
afs_get_read(struct afs_read * req)1084  static inline struct afs_read *afs_get_read(struct afs_read *req)
1085  {
1086  	refcount_inc(&req->usage);
1087  	return req;
1088  }
1089  
1090  /*
1091   * flock.c
1092   */
1093  extern struct workqueue_struct *afs_lock_manager;
1094  
1095  extern void afs_lock_op_done(struct afs_call *);
1096  extern void afs_lock_work(struct work_struct *);
1097  extern void afs_lock_may_be_available(struct afs_vnode *);
1098  extern int afs_lock(struct file *, int, struct file_lock *);
1099  extern int afs_flock(struct file *, int, struct file_lock *);
1100  
1101  /*
1102   * fsclient.c
1103   */
1104  extern void afs_fs_fetch_status(struct afs_operation *);
1105  extern void afs_fs_fetch_data(struct afs_operation *);
1106  extern void afs_fs_create_file(struct afs_operation *);
1107  extern void afs_fs_make_dir(struct afs_operation *);
1108  extern void afs_fs_remove_file(struct afs_operation *);
1109  extern void afs_fs_remove_dir(struct afs_operation *);
1110  extern void afs_fs_link(struct afs_operation *);
1111  extern void afs_fs_symlink(struct afs_operation *);
1112  extern void afs_fs_rename(struct afs_operation *);
1113  extern void afs_fs_store_data(struct afs_operation *);
1114  extern void afs_fs_setattr(struct afs_operation *);
1115  extern void afs_fs_get_volume_status(struct afs_operation *);
1116  extern void afs_fs_set_lock(struct afs_operation *);
1117  extern void afs_fs_extend_lock(struct afs_operation *);
1118  extern void afs_fs_release_lock(struct afs_operation *);
1119  extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
1120  					struct afs_addr_cursor *, struct key *);
1121  extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
1122  				    struct afs_addr_cursor *, struct key *);
1123  extern void afs_fs_inline_bulk_status(struct afs_operation *);
1124  
1125  struct afs_acl {
1126  	u32	size;
1127  	u8	data[];
1128  };
1129  
1130  extern void afs_fs_fetch_acl(struct afs_operation *);
1131  extern void afs_fs_store_acl(struct afs_operation *);
1132  
1133  /*
1134   * fs_operation.c
1135   */
1136  extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
1137  extern int afs_put_operation(struct afs_operation *);
1138  extern bool afs_begin_vnode_operation(struct afs_operation *);
1139  extern void afs_wait_for_operation(struct afs_operation *);
1140  extern int afs_do_sync_operation(struct afs_operation *);
1141  
afs_op_nomem(struct afs_operation * op)1142  static inline void afs_op_nomem(struct afs_operation *op)
1143  {
1144  	op->error = -ENOMEM;
1145  }
1146  
afs_op_set_vnode(struct afs_operation * op,unsigned int n,struct afs_vnode * vnode)1147  static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
1148  				    struct afs_vnode *vnode)
1149  {
1150  	op->file[n].vnode = vnode;
1151  	op->file[n].need_io_lock = true;
1152  }
1153  
afs_op_set_fid(struct afs_operation * op,unsigned int n,const struct afs_fid * fid)1154  static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
1155  				  const struct afs_fid *fid)
1156  {
1157  	op->file[n].fid = *fid;
1158  }
1159  
1160  /*
1161   * fs_probe.c
1162   */
1163  extern void afs_fileserver_probe_result(struct afs_call *);
1164  extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool);
1165  extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
1166  extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
1167  extern void afs_fs_probe_dispatcher(struct work_struct *);
1168  extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
1169  extern void afs_fs_probe_cleanup(struct afs_net *);
1170  
1171  /*
1172   * inode.c
1173   */
1174  extern const struct afs_operation_ops afs_fetch_status_operation;
1175  
1176  extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
1177  extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1178  extern int afs_ilookup5_test_by_fid(struct inode *, void *);
1179  extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1180  extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
1181  extern struct inode *afs_root_iget(struct super_block *, struct key *);
1182  extern bool afs_check_validity(struct afs_vnode *);
1183  extern int afs_validate(struct afs_vnode *, struct key *);
1184  extern int afs_getattr(struct user_namespace *mnt_userns, const struct path *,
1185  		       struct kstat *, u32, unsigned int);
1186  extern int afs_setattr(struct user_namespace *mnt_userns, struct dentry *, struct iattr *);
1187  extern void afs_evict_inode(struct inode *);
1188  extern int afs_drop_inode(struct inode *);
1189  
1190  /*
1191   * main.c
1192   */
1193  extern struct workqueue_struct *afs_wq;
1194  extern int afs_net_id;
1195  
afs_net(struct net * net)1196  static inline struct afs_net *afs_net(struct net *net)
1197  {
1198  	return net_generic(net, afs_net_id);
1199  }
1200  
afs_sb2net(struct super_block * sb)1201  static inline struct afs_net *afs_sb2net(struct super_block *sb)
1202  {
1203  	return afs_net(AFS_FS_S(sb)->net_ns);
1204  }
1205  
afs_d2net(struct dentry * dentry)1206  static inline struct afs_net *afs_d2net(struct dentry *dentry)
1207  {
1208  	return afs_sb2net(dentry->d_sb);
1209  }
1210  
afs_i2net(struct inode * inode)1211  static inline struct afs_net *afs_i2net(struct inode *inode)
1212  {
1213  	return afs_sb2net(inode->i_sb);
1214  }
1215  
afs_v2net(struct afs_vnode * vnode)1216  static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1217  {
1218  	return afs_i2net(&vnode->netfs.inode);
1219  }
1220  
afs_sock2net(struct sock * sk)1221  static inline struct afs_net *afs_sock2net(struct sock *sk)
1222  {
1223  	return net_generic(sock_net(sk), afs_net_id);
1224  }
1225  
__afs_stat(atomic_t * s)1226  static inline void __afs_stat(atomic_t *s)
1227  {
1228  	atomic_inc(s);
1229  }
1230  
1231  #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1232  
1233  /*
1234   * misc.c
1235   */
1236  extern int afs_abort_to_error(u32);
1237  extern void afs_prioritise_error(struct afs_error *, int, u32);
1238  
1239  /*
1240   * mntpt.c
1241   */
1242  extern const struct inode_operations afs_mntpt_inode_operations;
1243  extern const struct inode_operations afs_autocell_inode_operations;
1244  extern const struct file_operations afs_mntpt_file_operations;
1245  
1246  extern struct vfsmount *afs_d_automount(struct path *);
1247  extern void afs_mntpt_kill_timer(void);
1248  
1249  /*
1250   * proc.c
1251   */
1252  #ifdef CONFIG_PROC_FS
1253  extern int __net_init afs_proc_init(struct afs_net *);
1254  extern void __net_exit afs_proc_cleanup(struct afs_net *);
1255  extern int afs_proc_cell_setup(struct afs_cell *);
1256  extern void afs_proc_cell_remove(struct afs_cell *);
1257  extern void afs_put_sysnames(struct afs_sysnames *);
1258  #else
afs_proc_init(struct afs_net * net)1259  static inline int afs_proc_init(struct afs_net *net) { return 0; }
afs_proc_cleanup(struct afs_net * net)1260  static inline void afs_proc_cleanup(struct afs_net *net) {}
afs_proc_cell_setup(struct afs_cell * cell)1261  static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
afs_proc_cell_remove(struct afs_cell * cell)1262  static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
afs_put_sysnames(struct afs_sysnames * sysnames)1263  static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1264  #endif
1265  
1266  /*
1267   * rotate.c
1268   */
1269  extern bool afs_select_fileserver(struct afs_operation *);
1270  extern void afs_dump_edestaddrreq(const struct afs_operation *);
1271  
1272  /*
1273   * rxrpc.c
1274   */
1275  extern struct workqueue_struct *afs_async_calls;
1276  
1277  extern int __net_init afs_open_socket(struct afs_net *);
1278  extern void __net_exit afs_close_socket(struct afs_net *);
1279  extern void afs_charge_preallocation(struct work_struct *);
1280  extern void afs_put_call(struct afs_call *);
1281  extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
1282  extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
1283  extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1284  					    const struct afs_call_type *,
1285  					    size_t, size_t);
1286  extern void afs_flat_call_destructor(struct afs_call *);
1287  extern void afs_send_empty_reply(struct afs_call *);
1288  extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1289  extern int afs_extract_data(struct afs_call *, bool);
1290  extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
1291  
afs_make_op_call(struct afs_operation * op,struct afs_call * call,gfp_t gfp)1292  static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
1293  				    gfp_t gfp)
1294  {
1295  	op->call = call;
1296  	op->type = call->type;
1297  	call->op = op;
1298  	call->key = op->key;
1299  	call->intr = !(op->flags & AFS_OPERATION_UNINTR);
1300  	afs_make_call(&op->ac, call, gfp);
1301  }
1302  
afs_extract_begin(struct afs_call * call,void * buf,size_t size)1303  static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1304  {
1305  	call->iov_len = size;
1306  	call->kvec[0].iov_base = buf;
1307  	call->kvec[0].iov_len = size;
1308  	iov_iter_kvec(&call->def_iter, ITER_DEST, call->kvec, 1, size);
1309  }
1310  
afs_extract_to_tmp(struct afs_call * call)1311  static inline void afs_extract_to_tmp(struct afs_call *call)
1312  {
1313  	call->iov_len = sizeof(call->tmp);
1314  	afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1315  }
1316  
afs_extract_to_tmp64(struct afs_call * call)1317  static inline void afs_extract_to_tmp64(struct afs_call *call)
1318  {
1319  	call->iov_len = sizeof(call->tmp64);
1320  	afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1321  }
1322  
afs_extract_discard(struct afs_call * call,size_t size)1323  static inline void afs_extract_discard(struct afs_call *call, size_t size)
1324  {
1325  	call->iov_len = size;
1326  	iov_iter_discard(&call->def_iter, ITER_DEST, size);
1327  }
1328  
afs_extract_to_buf(struct afs_call * call,size_t size)1329  static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1330  {
1331  	call->iov_len = size;
1332  	afs_extract_begin(call, call->buffer, size);
1333  }
1334  
afs_transfer_reply(struct afs_call * call)1335  static inline int afs_transfer_reply(struct afs_call *call)
1336  {
1337  	return afs_extract_data(call, false);
1338  }
1339  
afs_check_call_state(struct afs_call * call,enum afs_call_state state)1340  static inline bool afs_check_call_state(struct afs_call *call,
1341  					enum afs_call_state state)
1342  {
1343  	return READ_ONCE(call->state) == state;
1344  }
1345  
afs_set_call_state(struct afs_call * call,enum afs_call_state from,enum afs_call_state to)1346  static inline bool afs_set_call_state(struct afs_call *call,
1347  				      enum afs_call_state from,
1348  				      enum afs_call_state to)
1349  {
1350  	bool ok = false;
1351  
1352  	spin_lock_bh(&call->state_lock);
1353  	if (call->state == from) {
1354  		call->state = to;
1355  		trace_afs_call_state(call, from, to, 0, 0);
1356  		ok = true;
1357  	}
1358  	spin_unlock_bh(&call->state_lock);
1359  	return ok;
1360  }
1361  
afs_set_call_complete(struct afs_call * call,int error,u32 remote_abort)1362  static inline void afs_set_call_complete(struct afs_call *call,
1363  					 int error, u32 remote_abort)
1364  {
1365  	enum afs_call_state state;
1366  	bool ok = false;
1367  
1368  	spin_lock_bh(&call->state_lock);
1369  	state = call->state;
1370  	if (state != AFS_CALL_COMPLETE) {
1371  		call->abort_code = remote_abort;
1372  		call->error = error;
1373  		call->state = AFS_CALL_COMPLETE;
1374  		trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1375  				     error, remote_abort);
1376  		ok = true;
1377  	}
1378  	spin_unlock_bh(&call->state_lock);
1379  	if (ok) {
1380  		trace_afs_call_done(call);
1381  
1382  		/* Asynchronous calls have two refs to release - one from the alloc and
1383  		 * one queued with the work item - and we can't just deallocate the
1384  		 * call because the work item may be queued again.
1385  		 */
1386  		if (call->drop_ref)
1387  			afs_put_call(call);
1388  	}
1389  }
1390  
1391  /*
1392   * security.c
1393   */
1394  extern void afs_put_permits(struct afs_permits *);
1395  extern void afs_clear_permits(struct afs_vnode *);
1396  extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1397  			     struct afs_status_cb *);
1398  extern void afs_zap_permits(struct rcu_head *);
1399  extern struct key *afs_request_key(struct afs_cell *);
1400  extern struct key *afs_request_key_rcu(struct afs_cell *);
1401  extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1402  extern int afs_permission(struct user_namespace *, struct inode *, int);
1403  extern void __exit afs_clean_up_permit_cache(void);
1404  
1405  /*
1406   * server.c
1407   */
1408  extern spinlock_t afs_server_peer_lock;
1409  
1410  extern struct afs_server *afs_find_server(struct afs_net *,
1411  					  const struct sockaddr_rxrpc *);
1412  extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1413  extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *, u32);
1414  extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
1415  extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
1416  extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1417  extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
1418  extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
1419  extern void afs_manage_servers(struct work_struct *);
1420  extern void afs_servers_timer(struct timer_list *);
1421  extern void afs_fs_probe_timer(struct timer_list *);
1422  extern void __net_exit afs_purge_servers(struct afs_net *);
1423  extern bool afs_check_server_record(struct afs_operation *, struct afs_server *);
1424  
afs_inc_servers_outstanding(struct afs_net * net)1425  static inline void afs_inc_servers_outstanding(struct afs_net *net)
1426  {
1427  	atomic_inc(&net->servers_outstanding);
1428  }
1429  
afs_dec_servers_outstanding(struct afs_net * net)1430  static inline void afs_dec_servers_outstanding(struct afs_net *net)
1431  {
1432  	if (atomic_dec_and_test(&net->servers_outstanding))
1433  		wake_up_var(&net->servers_outstanding);
1434  }
1435  
afs_is_probing_server(struct afs_server * server)1436  static inline bool afs_is_probing_server(struct afs_server *server)
1437  {
1438  	return list_empty(&server->probe_link);
1439  }
1440  
1441  /*
1442   * server_list.c
1443   */
afs_get_serverlist(struct afs_server_list * slist)1444  static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1445  {
1446  	refcount_inc(&slist->usage);
1447  	return slist;
1448  }
1449  
1450  extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1451  extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
1452  						     struct afs_vldb_entry *,
1453  						     u8);
1454  extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1455  
1456  /*
1457   * super.c
1458   */
1459  extern int __init afs_fs_init(void);
1460  extern void afs_fs_exit(void);
1461  
1462  /*
1463   * vlclient.c
1464   */
1465  extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1466  							 const char *, int);
1467  extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1468  extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
1469  						struct key *, struct afs_vlserver *, unsigned int);
1470  extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1471  extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
1472  
1473  /*
1474   * vl_alias.c
1475   */
1476  extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
1477  
1478  /*
1479   * vl_probe.c
1480   */
1481  extern void afs_vlserver_probe_result(struct afs_call *);
1482  extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1483  extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1484  
1485  /*
1486   * vl_rotate.c
1487   */
1488  extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1489  					 struct afs_cell *, struct key *);
1490  extern bool afs_select_vlserver(struct afs_vl_cursor *);
1491  extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1492  extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1493  
1494  /*
1495   * vlserver_list.c
1496   */
afs_get_vlserver(struct afs_vlserver * vlserver)1497  static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1498  {
1499  	refcount_inc(&vlserver->ref);
1500  	return vlserver;
1501  }
1502  
afs_get_vlserverlist(struct afs_vlserver_list * vllist)1503  static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1504  {
1505  	if (vllist)
1506  		refcount_inc(&vllist->ref);
1507  	return vllist;
1508  }
1509  
1510  extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1511  extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1512  extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1513  extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1514  extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1515  							   const void *, size_t);
1516  
1517  /*
1518   * volume.c
1519   */
1520  extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1521  extern int afs_activate_volume(struct afs_volume *);
1522  extern void afs_deactivate_volume(struct afs_volume *);
1523  bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
1524  extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
1525  extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
1526  extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
1527  
1528  /*
1529   * write.c
1530   */
1531  #ifdef CONFIG_AFS_FSCACHE
1532  bool afs_dirty_folio(struct address_space *, struct folio *);
1533  #else
1534  #define afs_dirty_folio filemap_dirty_folio
1535  #endif
1536  extern int afs_write_begin(struct file *file, struct address_space *mapping,
1537  			loff_t pos, unsigned len,
1538  			struct page **pagep, void **fsdata);
1539  extern int afs_write_end(struct file *file, struct address_space *mapping,
1540  			loff_t pos, unsigned len, unsigned copied,
1541  			struct page *page, void *fsdata);
1542  extern int afs_writepage(struct page *, struct writeback_control *);
1543  extern int afs_writepages(struct address_space *, struct writeback_control *);
1544  extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
1545  extern int afs_fsync(struct file *, loff_t, loff_t, int);
1546  extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1547  extern void afs_prune_wb_keys(struct afs_vnode *);
1548  int afs_launder_folio(struct folio *);
1549  
1550  /*
1551   * xattr.c
1552   */
1553  extern const struct xattr_handler *afs_xattr_handlers[];
1554  
1555  /*
1556   * yfsclient.c
1557   */
1558  extern void yfs_fs_fetch_data(struct afs_operation *);
1559  extern void yfs_fs_create_file(struct afs_operation *);
1560  extern void yfs_fs_make_dir(struct afs_operation *);
1561  extern void yfs_fs_remove_file2(struct afs_operation *);
1562  extern void yfs_fs_remove_file(struct afs_operation *);
1563  extern void yfs_fs_remove_dir(struct afs_operation *);
1564  extern void yfs_fs_link(struct afs_operation *);
1565  extern void yfs_fs_symlink(struct afs_operation *);
1566  extern void yfs_fs_rename(struct afs_operation *);
1567  extern void yfs_fs_store_data(struct afs_operation *);
1568  extern void yfs_fs_setattr(struct afs_operation *);
1569  extern void yfs_fs_get_volume_status(struct afs_operation *);
1570  extern void yfs_fs_set_lock(struct afs_operation *);
1571  extern void yfs_fs_extend_lock(struct afs_operation *);
1572  extern void yfs_fs_release_lock(struct afs_operation *);
1573  extern void yfs_fs_fetch_status(struct afs_operation *);
1574  extern void yfs_fs_inline_bulk_status(struct afs_operation *);
1575  
1576  struct yfs_acl {
1577  	struct afs_acl	*acl;		/* Dir/file/symlink ACL */
1578  	struct afs_acl	*vol_acl;	/* Whole volume ACL */
1579  	u32		inherit_flag;	/* True if ACL is inherited from parent dir */
1580  	u32		num_cleaned;	/* Number of ACEs removed due to subject removal */
1581  	unsigned int	flags;
1582  #define YFS_ACL_WANT_ACL	0x01	/* Set if caller wants ->acl */
1583  #define YFS_ACL_WANT_VOL_ACL	0x02	/* Set if caller wants ->vol_acl */
1584  };
1585  
1586  extern void yfs_free_opaque_acl(struct yfs_acl *);
1587  extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
1588  extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
1589  
1590  /*
1591   * Miscellaneous inline functions.
1592   */
AFS_FS_I(struct inode * inode)1593  static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1594  {
1595  	return container_of(inode, struct afs_vnode, netfs.inode);
1596  }
1597  
AFS_VNODE_TO_I(struct afs_vnode * vnode)1598  static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1599  {
1600  	return &vnode->netfs.inode;
1601  }
1602  
1603  /*
1604   * Note that a dentry got changed.  We need to set d_fsdata to the data version
1605   * number derived from the result of the operation.  It doesn't matter if
1606   * d_fsdata goes backwards as we'll just revalidate.
1607   */
afs_update_dentry_version(struct afs_operation * op,struct afs_vnode_param * dir_vp,struct dentry * dentry)1608  static inline void afs_update_dentry_version(struct afs_operation *op,
1609  					     struct afs_vnode_param *dir_vp,
1610  					     struct dentry *dentry)
1611  {
1612  	if (!op->error)
1613  		dentry->d_fsdata =
1614  			(void *)(unsigned long)dir_vp->scb.status.data_version;
1615  }
1616  
1617  /*
1618   * Set the file size and block count.  Estimate the number of 512 bytes blocks
1619   * used, rounded up to nearest 1K for consistency with other AFS clients.
1620   */
afs_set_i_size(struct afs_vnode * vnode,u64 size)1621  static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
1622  {
1623  	i_size_write(&vnode->netfs.inode, size);
1624  	vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
1625  }
1626  
1627  /*
1628   * Check for a conflicting operation on a directory that we just unlinked from.
1629   * If someone managed to sneak a link or an unlink in on the file we just
1630   * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
1631   */
afs_check_dir_conflict(struct afs_operation * op,struct afs_vnode_param * dvp)1632  static inline void afs_check_dir_conflict(struct afs_operation *op,
1633  					  struct afs_vnode_param *dvp)
1634  {
1635  	if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
1636  		op->flags |= AFS_OPERATION_DIR_CONFLICT;
1637  }
1638  
afs_io_error(struct afs_call * call,enum afs_io_error where)1639  static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1640  {
1641  	trace_afs_io_error(call->debug_id, -EIO, where);
1642  	return -EIO;
1643  }
1644  
afs_bad(struct afs_vnode * vnode,enum afs_file_error where)1645  static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1646  {
1647  	trace_afs_file_error(vnode, -EIO, where);
1648  	return -EIO;
1649  }
1650  
1651  /*****************************************************************************/
1652  /*
1653   * debug tracing
1654   */
1655  extern unsigned afs_debug;
1656  
1657  #define dbgprintk(FMT,...) \
1658  	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1659  
1660  #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1661  #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1662  #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1663  
1664  
1665  #if defined(__KDEBUG)
1666  #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1667  #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1668  #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1669  
1670  #elif defined(CONFIG_AFS_DEBUG)
1671  #define AFS_DEBUG_KENTER	0x01
1672  #define AFS_DEBUG_KLEAVE	0x02
1673  #define AFS_DEBUG_KDEBUG	0x04
1674  
1675  #define _enter(FMT,...)					\
1676  do {							\
1677  	if (unlikely(afs_debug & AFS_DEBUG_KENTER))	\
1678  		kenter(FMT,##__VA_ARGS__);		\
1679  } while (0)
1680  
1681  #define _leave(FMT,...)					\
1682  do {							\
1683  	if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))	\
1684  		kleave(FMT,##__VA_ARGS__);		\
1685  } while (0)
1686  
1687  #define _debug(FMT,...)					\
1688  do {							\
1689  	if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))	\
1690  		kdebug(FMT,##__VA_ARGS__);		\
1691  } while (0)
1692  
1693  #else
1694  #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1695  #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1696  #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1697  #endif
1698  
1699  /*
1700   * debug assertion checking
1701   */
1702  #if 1 // defined(__KDEBUGALL)
1703  
1704  #define ASSERT(X)						\
1705  do {								\
1706  	if (unlikely(!(X))) {					\
1707  		printk(KERN_ERR "\n");				\
1708  		printk(KERN_ERR "AFS: Assertion failed\n");	\
1709  		BUG();						\
1710  	}							\
1711  } while(0)
1712  
1713  #define ASSERTCMP(X, OP, Y)						\
1714  do {									\
1715  	if (unlikely(!((X) OP (Y)))) {					\
1716  		printk(KERN_ERR "\n");					\
1717  		printk(KERN_ERR "AFS: Assertion failed\n");		\
1718  		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
1719  		       (unsigned long)(X), (unsigned long)(Y));		\
1720  		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
1721  		       (unsigned long)(X), (unsigned long)(Y));		\
1722  		BUG();							\
1723  	}								\
1724  } while(0)
1725  
1726  #define ASSERTRANGE(L, OP1, N, OP2, H)					\
1727  do {									\
1728  	if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {		\
1729  		printk(KERN_ERR "\n");					\
1730  		printk(KERN_ERR "AFS: Assertion failed\n");		\
1731  		printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n",	\
1732  		       (unsigned long)(L), (unsigned long)(N),		\
1733  		       (unsigned long)(H));				\
1734  		printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1735  		       (unsigned long)(L), (unsigned long)(N),		\
1736  		       (unsigned long)(H));				\
1737  		BUG();							\
1738  	}								\
1739  } while(0)
1740  
1741  #define ASSERTIF(C, X)						\
1742  do {								\
1743  	if (unlikely((C) && !(X))) {				\
1744  		printk(KERN_ERR "\n");				\
1745  		printk(KERN_ERR "AFS: Assertion failed\n");	\
1746  		BUG();						\
1747  	}							\
1748  } while(0)
1749  
1750  #define ASSERTIFCMP(C, X, OP, Y)					\
1751  do {									\
1752  	if (unlikely((C) && !((X) OP (Y)))) {				\
1753  		printk(KERN_ERR "\n");					\
1754  		printk(KERN_ERR "AFS: Assertion failed\n");		\
1755  		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
1756  		       (unsigned long)(X), (unsigned long)(Y));		\
1757  		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
1758  		       (unsigned long)(X), (unsigned long)(Y));		\
1759  		BUG();							\
1760  	}								\
1761  } while(0)
1762  
1763  #else
1764  
1765  #define ASSERT(X)				\
1766  do {						\
1767  } while(0)
1768  
1769  #define ASSERTCMP(X, OP, Y)			\
1770  do {						\
1771  } while(0)
1772  
1773  #define ASSERTRANGE(L, OP1, N, OP2, H)		\
1774  do {						\
1775  } while(0)
1776  
1777  #define ASSERTIF(C, X)				\
1778  do {						\
1779  } while(0)
1780  
1781  #define ASSERTIFCMP(C, X, OP, Y)		\
1782  do {						\
1783  } while(0)
1784  
1785  #endif /* __KDEBUGALL */
1786