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TOMOYO Linux Cross Reference
Linux/fs/afs/internal.h

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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 
 35 /*
 36  * Partial file-locking emulation mode.  (The problem being that AFS3 only
 37  * allows whole-file locks and no upgrading/downgrading).
 38  */
 39 enum afs_flock_mode {
 40         afs_flock_mode_unset,
 41         afs_flock_mode_local,   /* Local locking only */
 42         afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
 43         afs_flock_mode_strict,  /* Always get a server lock for a partial lock */
 44         afs_flock_mode_write,   /* Get an exclusive server lock for a partial lock */
 45 };
 46 
 47 struct afs_fs_context {
 48         bool                    force;          /* T to force cell type */
 49         bool                    autocell;       /* T if set auto mount operation */
 50         bool                    dyn_root;       /* T if dynamic root */
 51         bool                    no_cell;        /* T if the source is "none" (for dynroot) */
 52         enum afs_flock_mode     flock_mode;     /* Partial file-locking emulation mode */
 53         afs_voltype_t           type;           /* type of volume requested */
 54         unsigned int            volnamesz;      /* size of volume name */
 55         const char              *volname;       /* name of volume to mount */
 56         struct afs_net          *net;           /* the AFS net namespace stuff */
 57         struct afs_cell         *cell;          /* cell in which to find volume */
 58         struct afs_volume       *volume;        /* volume record */
 59         struct key              *key;           /* key to use for secure mounting */
 60 };
 61 
 62 struct afs_iget_data {
 63         struct afs_fid          fid;
 64         struct afs_volume       *volume;        /* volume on which resides */
 65         unsigned int            cb_v_break;     /* Pre-fetch volume break count */
 66         unsigned int            cb_s_break;     /* Pre-fetch server break count */
 67 };
 68 
 69 enum afs_call_state {
 70         AFS_CALL_CL_REQUESTING,         /* Client: Request is being sent */
 71         AFS_CALL_CL_AWAIT_REPLY,        /* Client: Awaiting reply */
 72         AFS_CALL_CL_PROC_REPLY,         /* Client: rxrpc call complete; processing reply */
 73         AFS_CALL_SV_AWAIT_OP_ID,        /* Server: Awaiting op ID */
 74         AFS_CALL_SV_AWAIT_REQUEST,      /* Server: Awaiting request data */
 75         AFS_CALL_SV_REPLYING,           /* Server: Replying */
 76         AFS_CALL_SV_AWAIT_ACK,          /* Server: Awaiting final ACK */
 77         AFS_CALL_COMPLETE,              /* Completed or failed */
 78 };
 79 
 80 /*
 81  * List of server addresses.
 82  */
 83 struct afs_addr_list {
 84         struct rcu_head         rcu;            /* Must be first */
 85         refcount_t              usage;
 86         u32                     version;        /* Version */
 87         unsigned char           max_addrs;
 88         unsigned char           nr_addrs;
 89         unsigned char           preferred;      /* Preferred address */
 90         unsigned char           nr_ipv4;        /* Number of IPv4 addresses */
 91         enum dns_record_source  source:8;
 92         enum dns_lookup_status  status:8;
 93         unsigned long           probed;         /* Mask of servers that have been probed */
 94         unsigned long           failed;         /* Mask of addrs that failed locally/ICMP */
 95         unsigned long           responded;      /* Mask of addrs that responded */
 96         struct sockaddr_rxrpc   addrs[];
 97 #define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
 98 };
 99 
100 /*
101  * a record of an in-progress RxRPC call
102  */
103 struct afs_call {
104         const struct afs_call_type *type;       /* type of call */
105         struct afs_addr_list    *alist;         /* Address is alist[addr_ix] */
106         wait_queue_head_t       waitq;          /* processes awaiting completion */
107         struct work_struct      async_work;     /* async I/O processor */
108         struct work_struct      work;           /* actual work processor */
109         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
110         struct key              *key;           /* security for this call */
111         struct afs_net          *net;           /* The network namespace */
112         struct afs_server       *server;        /* The fileserver record if fs op (pins ref) */
113         struct afs_vlserver     *vlserver;      /* The vlserver record if vl op */
114         struct afs_cb_interest  *cbi;           /* Callback interest for server used */
115         struct afs_vnode        *lvnode;        /* vnode being locked */
116         void                    *request;       /* request data (first part) */
117         struct address_space    *mapping;       /* Pages being written from */
118         struct iov_iter         iter;           /* Buffer iterator */
119         struct iov_iter         *_iter;         /* Iterator currently in use */
120         union { /* Convenience for ->iter */
121                 struct kvec     kvec[1];
122                 struct bio_vec  bvec[1];
123         };
124         void                    *buffer;        /* reply receive buffer */
125         union {
126                 long                    ret0;   /* Value to reply with instead of 0 */
127                 struct afs_addr_list    *ret_alist;
128                 struct afs_vldb_entry   *ret_vldb;
129                 struct afs_acl          *ret_acl;
130         };
131         struct afs_fid          *out_fid;
132         struct afs_status_cb    *out_dir_scb;
133         struct afs_status_cb    *out_scb;
134         struct yfs_acl          *out_yacl;
135         struct afs_volsync      *out_volsync;
136         struct afs_volume_status *out_volstatus;
137         struct afs_read         *read_request;
138         unsigned int            server_index;
139         pgoff_t                 first;          /* first page in mapping to deal with */
140         pgoff_t                 last;           /* last page in mapping to deal with */
141         atomic_t                usage;
142         enum afs_call_state     state;
143         spinlock_t              state_lock;
144         int                     error;          /* error code */
145         u32                     abort_code;     /* Remote abort ID or 0 */
146         u32                     epoch;
147         unsigned int            max_lifespan;   /* Maximum lifespan to set if not 0 */
148         unsigned                request_size;   /* size of request data */
149         unsigned                reply_max;      /* maximum size of reply */
150         unsigned                first_offset;   /* offset into mapping[first] */
151         union {
152                 unsigned        last_to;        /* amount of mapping[last] */
153                 unsigned        count2;         /* count used in unmarshalling */
154         };
155         unsigned char           unmarshall;     /* unmarshalling phase */
156         unsigned char           addr_ix;        /* Address in ->alist */
157         bool                    incoming;       /* T if incoming call */
158         bool                    send_pages;     /* T if data from mapping should be sent */
159         bool                    need_attention; /* T if RxRPC poked us */
160         bool                    async;          /* T if asynchronous */
161         bool                    upgrade;        /* T to request service upgrade */
162         bool                    have_reply_time; /* T if have got reply_time */
163         bool                    intr;           /* T if interruptible */
164         u16                     service_id;     /* Actual service ID (after upgrade) */
165         unsigned int            debug_id;       /* Trace ID */
166         u32                     operation_ID;   /* operation ID for an incoming call */
167         u32                     count;          /* count for use in unmarshalling */
168         union {                                 /* place to extract temporary data */
169                 struct {
170                         __be32  tmp_u;
171                         __be32  tmp;
172                 } __attribute__((packed));
173                 __be64          tmp64;
174         };
175         ktime_t                 reply_time;     /* Time of first reply packet */
176 };
177 
178 struct afs_call_type {
179         const char *name;
180         unsigned int op; /* Really enum afs_fs_operation */
181 
182         /* deliver request or reply data to an call
183          * - returning an error will cause the call to be aborted
184          */
185         int (*deliver)(struct afs_call *call);
186 
187         /* clean up a call */
188         void (*destructor)(struct afs_call *call);
189 
190         /* Work function */
191         void (*work)(struct work_struct *work);
192 
193         /* Call done function (gets called immediately on success or failure) */
194         void (*done)(struct afs_call *call);
195 };
196 
197 /*
198  * Key available for writeback on a file.
199  */
200 struct afs_wb_key {
201         refcount_t              usage;
202         struct key              *key;
203         struct list_head        vnode_link;     /* Link in vnode->wb_keys */
204 };
205 
206 /*
207  * AFS open file information record.  Pointed to by file->private_data.
208  */
209 struct afs_file {
210         struct key              *key;           /* The key this file was opened with */
211         struct afs_wb_key       *wb;            /* Writeback key record for this file */
212 };
213 
214 static inline struct key *afs_file_key(struct file *file)
215 {
216         struct afs_file *af = file->private_data;
217 
218         return af->key;
219 }
220 
221 /*
222  * Record of an outstanding read operation on a vnode.
223  */
224 struct afs_read {
225         loff_t                  pos;            /* Where to start reading */
226         loff_t                  len;            /* How much we're asking for */
227         loff_t                  actual_len;     /* How much we're actually getting */
228         loff_t                  remain;         /* Amount remaining */
229         loff_t                  file_size;      /* File size returned by server */
230         afs_dataversion_t       data_version;   /* Version number returned by server */
231         refcount_t              usage;
232         unsigned int            index;          /* Which page we're reading into */
233         unsigned int            nr_pages;
234         unsigned int            offset;         /* offset into current page */
235         struct afs_vnode        *vnode;
236         void (*page_done)(struct afs_read *);
237         struct page             **pages;
238         struct page             *array[];
239 };
240 
241 /*
242  * AFS superblock private data
243  * - there's one superblock per volume
244  */
245 struct afs_super_info {
246         struct net              *net_ns;        /* Network namespace */
247         struct afs_cell         *cell;          /* The cell in which the volume resides */
248         struct afs_volume       *volume;        /* volume record */
249         enum afs_flock_mode     flock_mode:8;   /* File locking emulation mode */
250         bool                    dyn_root;       /* True if dynamic root */
251 };
252 
253 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
254 {
255         return sb->s_fs_info;
256 }
257 
258 extern struct file_system_type afs_fs_type;
259 
260 /*
261  * Set of substitutes for @sys.
262  */
263 struct afs_sysnames {
264 #define AFS_NR_SYSNAME 16
265         char                    *subs[AFS_NR_SYSNAME];
266         refcount_t              usage;
267         unsigned short          nr;
268         char                    blank[1];
269 };
270 
271 /*
272  * AFS network namespace record.
273  */
274 struct afs_net {
275         struct net              *net;           /* Backpointer to the owning net namespace */
276         struct afs_uuid         uuid;
277         bool                    live;           /* F if this namespace is being removed */
278 
279         /* AF_RXRPC I/O stuff */
280         struct socket           *socket;
281         struct afs_call         *spare_incoming_call;
282         struct work_struct      charge_preallocation_work;
283         struct mutex            socket_mutex;
284         atomic_t                nr_outstanding_calls;
285         atomic_t                nr_superblocks;
286 
287         /* Cell database */
288         struct rb_root          cells;
289         struct afs_cell __rcu   *ws_cell;
290         struct work_struct      cells_manager;
291         struct timer_list       cells_timer;
292         atomic_t                cells_outstanding;
293         seqlock_t               cells_lock;
294 
295         struct mutex            proc_cells_lock;
296         struct hlist_head       proc_cells;
297 
298         /* Known servers.  Theoretically each fileserver can only be in one
299          * cell, but in practice, people create aliases and subsets and there's
300          * no easy way to distinguish them.
301          */
302         seqlock_t               fs_lock;        /* For fs_servers */
303         struct rb_root          fs_servers;     /* afs_server (by server UUID or address) */
304         struct list_head        fs_updates;     /* afs_server (by update_at) */
305         struct hlist_head       fs_proc;        /* procfs servers list */
306 
307         struct hlist_head       fs_addresses4;  /* afs_server (by lowest IPv4 addr) */
308         struct hlist_head       fs_addresses6;  /* afs_server (by lowest IPv6 addr) */
309         seqlock_t               fs_addr_lock;   /* For fs_addresses[46] */
310 
311         struct work_struct      fs_manager;
312         struct timer_list       fs_timer;
313         atomic_t                servers_outstanding;
314 
315         /* File locking renewal management */
316         struct mutex            lock_manager_mutex;
317 
318         /* Misc */
319         struct super_block      *dynroot_sb;    /* Dynamic root mount superblock */
320         struct proc_dir_entry   *proc_afs;      /* /proc/net/afs directory */
321         struct afs_sysnames     *sysnames;
322         rwlock_t                sysnames_lock;
323 
324         /* Statistics counters */
325         atomic_t                n_lookup;       /* Number of lookups done */
326         atomic_t                n_reval;        /* Number of dentries needing revalidation */
327         atomic_t                n_inval;        /* Number of invalidations by the server */
328         atomic_t                n_relpg;        /* Number of invalidations by releasepage */
329         atomic_t                n_read_dir;     /* Number of directory pages read */
330         atomic_t                n_dir_cr;       /* Number of directory entry creation edits */
331         atomic_t                n_dir_rm;       /* Number of directory entry removal edits */
332         atomic_t                n_stores;       /* Number of store ops */
333         atomic_long_t           n_store_bytes;  /* Number of bytes stored */
334         atomic_long_t           n_fetch_bytes;  /* Number of bytes fetched */
335         atomic_t                n_fetches;      /* Number of data fetch ops */
336 };
337 
338 extern const char afs_init_sysname[];
339 
340 enum afs_cell_state {
341         AFS_CELL_UNSET,
342         AFS_CELL_ACTIVATING,
343         AFS_CELL_ACTIVE,
344         AFS_CELL_DEACTIVATING,
345         AFS_CELL_INACTIVE,
346         AFS_CELL_FAILED,
347 };
348 
349 /*
350  * AFS cell record.
351  *
352  * This is a tricky concept to get right as it is possible to create aliases
353  * simply by pointing AFSDB/SRV records for two names at the same set of VL
354  * servers; it is also possible to do things like setting up two sets of VL
355  * servers, one of which provides a superset of the volumes provided by the
356  * other (for internal/external division, for example).
357  *
358  * Cells only exist in the sense that (a) a cell's name maps to a set of VL
359  * servers and (b) a cell's name is used by the client to select the key to use
360  * for authentication and encryption.  The cell name is not typically used in
361  * the protocol.
362  *
363  * There is no easy way to determine if two cells are aliases or one is a
364  * subset of another.
365  */
366 struct afs_cell {
367         union {
368                 struct rcu_head rcu;
369                 struct rb_node  net_node;       /* Node in net->cells */
370         };
371         struct afs_net          *net;
372         struct key              *anonymous_key; /* anonymous user key for this cell */
373         struct work_struct      manager;        /* Manager for init/deinit/dns */
374         struct hlist_node       proc_link;      /* /proc cell list link */
375 #ifdef CONFIG_AFS_FSCACHE
376         struct fscache_cookie   *cache;         /* caching cookie */
377 #endif
378         time64_t                dns_expiry;     /* Time AFSDB/SRV record expires */
379         time64_t                last_inactive;  /* Time of last drop of usage count */
380         atomic_t                usage;
381         unsigned long           flags;
382 #define AFS_CELL_FL_NO_GC       0               /* The cell was added manually, don't auto-gc */
383 #define AFS_CELL_FL_DO_LOOKUP   1               /* DNS lookup requested */
384         enum afs_cell_state     state;
385         short                   error;
386         enum dns_record_source  dns_source:8;   /* Latest source of data from lookup */
387         enum dns_lookup_status  dns_status:8;   /* Latest status of data from lookup */
388         unsigned int            dns_lookup_count; /* Counter of DNS lookups */
389 
390         /* Active fileserver interaction state. */
391         struct list_head        proc_volumes;   /* procfs volume list */
392         rwlock_t                proc_lock;
393 
394         /* VL server list. */
395         rwlock_t                vl_servers_lock; /* Lock on vl_servers */
396         struct afs_vlserver_list __rcu *vl_servers;
397 
398         u8                      name_len;       /* Length of name */
399         char                    name[64 + 1];   /* Cell name, case-flattened and NUL-padded */
400 };
401 
402 /*
403  * Volume Location server record.
404  */
405 struct afs_vlserver {
406         struct rcu_head         rcu;
407         struct afs_addr_list    __rcu *addresses; /* List of addresses for this VL server */
408         unsigned long           flags;
409 #define AFS_VLSERVER_FL_PROBED  0               /* The VL server has been probed */
410 #define AFS_VLSERVER_FL_PROBING 1               /* VL server is being probed */
411 #define AFS_VLSERVER_FL_IS_YFS  2               /* Server is YFS not AFS */
412         rwlock_t                lock;           /* Lock on addresses */
413         atomic_t                usage;
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 as ktime/64 */
421                 u32             abort_code;
422                 short           error;
423                 bool            have_result;
424                 bool            responded:1;
425                 bool            is_yfs:1;
426                 bool            not_yfs:1;
427                 bool            local_failure:1;
428         } probe;
429 
430         u16                     port;
431         u16                     name_len;       /* Length of name */
432         char                    name[];         /* Server name, case-flattened */
433 };
434 
435 /*
436  * Weighted list of Volume Location servers.
437  */
438 struct afs_vlserver_entry {
439         u16                     priority;       /* Preference (as SRV) */
440         u16                     weight;         /* Weight (as SRV) */
441         enum dns_record_source  source:8;
442         enum dns_lookup_status  status:8;
443         struct afs_vlserver     *server;
444 };
445 
446 struct afs_vlserver_list {
447         struct rcu_head         rcu;
448         atomic_t                usage;
449         u8                      nr_servers;
450         u8                      index;          /* Server currently in use */
451         u8                      preferred;      /* Preferred server */
452         enum dns_record_source  source:8;
453         enum dns_lookup_status  status:8;
454         rwlock_t                lock;
455         struct afs_vlserver_entry servers[];
456 };
457 
458 /*
459  * Cached VLDB entry.
460  *
461  * This is pointed to by cell->vldb_entries, indexed by name.
462  */
463 struct afs_vldb_entry {
464         afs_volid_t             vid[3];         /* Volume IDs for R/W, R/O and Bak volumes */
465 
466         unsigned long           flags;
467 #define AFS_VLDB_HAS_RW         0               /* - R/W volume exists */
468 #define AFS_VLDB_HAS_RO         1               /* - R/O volume exists */
469 #define AFS_VLDB_HAS_BAK        2               /* - Backup volume exists */
470 #define AFS_VLDB_QUERY_VALID    3               /* - Record is valid */
471 #define AFS_VLDB_QUERY_ERROR    4               /* - VL server returned error */
472 
473         uuid_t                  fs_server[AFS_NMAXNSERVERS];
474         u8                      fs_mask[AFS_NMAXNSERVERS];
475 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
476 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
477 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
478         short                   error;
479         u8                      nr_servers;     /* Number of server records */
480         u8                      name_len;
481         u8                      name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
482 };
483 
484 /*
485  * Record of fileserver with which we're actively communicating.
486  */
487 struct afs_server {
488         struct rcu_head         rcu;
489         union {
490                 uuid_t          uuid;           /* Server ID */
491                 struct afs_uuid _uuid;
492         };
493 
494         struct afs_addr_list    __rcu *addresses;
495         struct rb_node          uuid_rb;        /* Link in net->servers */
496         struct hlist_node       addr4_link;     /* Link in net->fs_addresses4 */
497         struct hlist_node       addr6_link;     /* Link in net->fs_addresses6 */
498         struct hlist_node       proc_link;      /* Link in net->fs_proc */
499         struct afs_server       *gc_next;       /* Next server in manager's list */
500         time64_t                put_time;       /* Time at which last put */
501         time64_t                update_at;      /* Time at which to next update the record */
502         unsigned long           flags;
503 #define AFS_SERVER_FL_NOT_READY 1               /* The record is not ready for use */
504 #define AFS_SERVER_FL_NOT_FOUND 2               /* VL server says no such server */
505 #define AFS_SERVER_FL_VL_FAIL   3               /* Failed to access VL server */
506 #define AFS_SERVER_FL_UPDATING  4
507 #define AFS_SERVER_FL_PROBED    5               /* The fileserver has been probed */
508 #define AFS_SERVER_FL_PROBING   6               /* Fileserver is being probed */
509 #define AFS_SERVER_FL_NO_IBULK  7               /* Fileserver doesn't support FS.InlineBulkStatus */
510 #define AFS_SERVER_FL_MAY_HAVE_CB 8             /* May have callbacks on this fileserver */
511 #define AFS_SERVER_FL_IS_YFS    9               /* Server is YFS not AFS */
512 #define AFS_SERVER_FL_NO_RM2    10              /* Fileserver doesn't support YFS.RemoveFile2 */
513 #define AFS_SERVER_FL_HAVE_EPOCH 11             /* ->epoch is valid */
514         atomic_t                usage;
515         u32                     addr_version;   /* Address list version */
516         u32                     cm_epoch;       /* Server RxRPC epoch */
517 
518         /* file service access */
519         rwlock_t                fs_lock;        /* access lock */
520 
521         /* callback promise management */
522         struct hlist_head       cb_volumes;     /* List of volume interests on this server */
523         unsigned                cb_s_break;     /* Break-everything counter. */
524         rwlock_t                cb_break_lock;  /* Volume finding lock */
525 
526         /* Probe state */
527         wait_queue_head_t       probe_wq;
528         atomic_t                probe_outstanding;
529         spinlock_t              probe_lock;
530         struct {
531                 unsigned int    rtt;            /* RTT as ktime/64 */
532                 u32             abort_code;
533                 u32             cm_epoch;
534                 short           error;
535                 bool            have_result;
536                 bool            responded:1;
537                 bool            is_yfs:1;
538                 bool            not_yfs:1;
539                 bool            local_failure:1;
540                 bool            no_epoch:1;
541                 bool            cm_probed:1;
542                 bool            said_rebooted:1;
543                 bool            said_inconsistent:1;
544         } probe;
545 };
546 
547 /*
548  * Volume collation in the server's callback interest list.
549  */
550 struct afs_vol_interest {
551         struct hlist_node       srv_link;       /* Link in server->cb_volumes */
552         struct hlist_head       cb_interests;   /* List of callback interests on the server */
553         union {
554                 struct rcu_head rcu;
555                 afs_volid_t     vid;            /* Volume ID to match */
556         };
557         unsigned int            usage;
558 };
559 
560 /*
561  * Interest by a superblock on a server.
562  */
563 struct afs_cb_interest {
564         struct hlist_node       cb_vlink;       /* Link in vol_interest->cb_interests */
565         struct afs_vol_interest *vol_interest;
566         struct afs_server       *server;        /* Server on which this interest resides */
567         struct super_block      *sb;            /* Superblock on which inodes reside */
568         union {
569                 struct rcu_head rcu;
570                 afs_volid_t     vid;            /* Volume ID to match */
571         };
572         refcount_t              usage;
573 };
574 
575 /*
576  * Replaceable server list.
577  */
578 struct afs_server_entry {
579         struct afs_server       *server;
580         struct afs_cb_interest  *cb_interest;
581 };
582 
583 struct afs_server_list {
584         refcount_t              usage;
585         unsigned char           nr_servers;
586         unsigned char           preferred;      /* Preferred server */
587         unsigned short          vnovol_mask;    /* Servers to be skipped due to VNOVOL */
588         unsigned int            seq;            /* Set to ->servers_seq when installed */
589         rwlock_t                lock;
590         struct afs_server_entry servers[];
591 };
592 
593 /*
594  * Live AFS volume management.
595  */
596 struct afs_volume {
597         afs_volid_t             vid;            /* volume ID */
598         atomic_t                usage;
599         time64_t                update_at;      /* Time at which to next update */
600         struct afs_cell         *cell;          /* Cell to which belongs (pins ref) */
601         struct list_head        proc_link;      /* Link in cell->vl_proc */
602         unsigned long           flags;
603 #define AFS_VOLUME_NEEDS_UPDATE 0       /* - T if an update needs performing */
604 #define AFS_VOLUME_UPDATING     1       /* - T if an update is in progress */
605 #define AFS_VOLUME_WAIT         2       /* - T if users must wait for update */
606 #define AFS_VOLUME_DELETED      3       /* - T if volume appears deleted */
607 #define AFS_VOLUME_OFFLINE      4       /* - T if volume offline notice given */
608 #define AFS_VOLUME_BUSY         5       /* - T if volume busy notice given */
609 #ifdef CONFIG_AFS_FSCACHE
610         struct fscache_cookie   *cache;         /* caching cookie */
611 #endif
612         struct afs_server_list  *servers;       /* List of servers on which volume resides */
613         rwlock_t                servers_lock;   /* Lock for ->servers */
614         unsigned int            servers_seq;    /* Incremented each time ->servers changes */
615 
616         unsigned                cb_v_break;     /* Break-everything counter. */
617         rwlock_t                cb_v_break_lock;
618 
619         afs_voltype_t           type;           /* type of volume */
620         short                   error;
621         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
622         u8                      name_len;
623         u8                      name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
624 };
625 
626 enum afs_lock_state {
627         AFS_VNODE_LOCK_NONE,            /* The vnode has no lock on the server */
628         AFS_VNODE_LOCK_WAITING_FOR_CB,  /* We're waiting for the server to break the callback */
629         AFS_VNODE_LOCK_SETTING,         /* We're asking the server for a lock */
630         AFS_VNODE_LOCK_GRANTED,         /* We have a lock on the server */
631         AFS_VNODE_LOCK_EXTENDING,       /* We're extending a lock on the server */
632         AFS_VNODE_LOCK_NEED_UNLOCK,     /* We need to unlock on the server */
633         AFS_VNODE_LOCK_UNLOCKING,       /* We're telling the server to unlock */
634         AFS_VNODE_LOCK_DELETED,         /* The vnode has been deleted whilst we have a lock */
635 };
636 
637 /*
638  * AFS inode private data.
639  *
640  * Note that afs_alloc_inode() *must* reset anything that could incorrectly
641  * leak from one inode to another.
642  */
643 struct afs_vnode {
644         struct inode            vfs_inode;      /* the VFS's inode record */
645 
646         struct afs_volume       *volume;        /* volume on which vnode resides */
647         struct afs_fid          fid;            /* the file identifier for this inode */
648         struct afs_file_status  status;         /* AFS status info for this file */
649         afs_dataversion_t       invalid_before; /* Child dentries are invalid before this */
650 #ifdef CONFIG_AFS_FSCACHE
651         struct fscache_cookie   *cache;         /* caching cookie */
652 #endif
653         struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
654         struct mutex            io_lock;        /* Lock for serialising I/O on this mutex */
655         struct rw_semaphore     validate_lock;  /* lock for validating this vnode */
656         struct rw_semaphore     rmdir_lock;     /* Lock for rmdir vs sillyrename */
657         struct key              *silly_key;     /* Silly rename key */
658         spinlock_t              wb_lock;        /* lock for wb_keys */
659         spinlock_t              lock;           /* waitqueue/flags lock */
660         unsigned long           flags;
661 #define AFS_VNODE_CB_PROMISED   0               /* Set if vnode has a callback promise */
662 #define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
663 #define AFS_VNODE_DIR_VALID     2               /* Set if dir contents are valid */
664 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
665 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
666 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
667 #define AFS_VNODE_AUTOCELL      6               /* set if Vnode is an auto mount point */
668 #define AFS_VNODE_PSEUDODIR     7               /* set if Vnode is a pseudo directory */
669 #define AFS_VNODE_NEW_CONTENT   8               /* Set if file has new content (create/trunc-0) */
670 
671         struct list_head        wb_keys;        /* List of keys available for writeback */
672         struct list_head        pending_locks;  /* locks waiting to be granted */
673         struct list_head        granted_locks;  /* locks granted on this file */
674         struct delayed_work     lock_work;      /* work to be done in locking */
675         struct key              *lock_key;      /* Key to be used in lock ops */
676         ktime_t                 locked_at;      /* Time at which lock obtained */
677         enum afs_lock_state     lock_state : 8;
678         afs_lock_type_t         lock_type : 8;
679 
680         /* outstanding callback notification on this file */
681         struct afs_cb_interest __rcu *cb_interest; /* Server on which this resides */
682         unsigned int            cb_s_break;     /* Mass break counter on ->server */
683         unsigned int            cb_v_break;     /* Mass break counter on ->volume */
684         unsigned int            cb_break;       /* Break counter on vnode */
685         seqlock_t               cb_lock;        /* Lock for ->cb_interest, ->status, ->cb_*break */
686 
687         time64_t                cb_expires_at;  /* time at which callback expires */
688 };
689 
690 static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
691 {
692 #ifdef CONFIG_AFS_FSCACHE
693         return vnode->cache;
694 #else
695         return NULL;
696 #endif
697 }
698 
699 /*
700  * cached security record for one user's attempt to access a vnode
701  */
702 struct afs_permit {
703         struct key              *key;           /* RxRPC ticket holding a security context */
704         afs_access_t            access;         /* CallerAccess value for this key */
705 };
706 
707 /*
708  * Immutable cache of CallerAccess records from attempts to access vnodes.
709  * These may be shared between multiple vnodes.
710  */
711 struct afs_permits {
712         struct rcu_head         rcu;
713         struct hlist_node       hash_node;      /* Link in hash */
714         unsigned long           h;              /* Hash value for this permit list */
715         refcount_t              usage;
716         unsigned short          nr_permits;     /* Number of records */
717         bool                    invalidated;    /* Invalidated due to key change */
718         struct afs_permit       permits[];      /* List of permits sorted by key pointer */
719 };
720 
721 /*
722  * record of one of a system's set of network interfaces
723  */
724 struct afs_interface {
725         struct in_addr  address;        /* IPv4 address bound to interface */
726         struct in_addr  netmask;        /* netmask applied to address */
727         unsigned        mtu;            /* MTU of interface */
728 };
729 
730 /*
731  * Error prioritisation and accumulation.
732  */
733 struct afs_error {
734         short   error;                  /* Accumulated error */
735         bool    responded;              /* T if server responded */
736 };
737 
738 /*
739  * Cursor for iterating over a server's address list.
740  */
741 struct afs_addr_cursor {
742         struct afs_addr_list    *alist;         /* Current address list (pins ref) */
743         unsigned long           tried;          /* Tried addresses */
744         signed char             index;          /* Current address */
745         bool                    responded;      /* T if the current address responded */
746         unsigned short          nr_iterations;  /* Number of address iterations */
747         short                   error;
748         u32                     abort_code;
749 };
750 
751 /*
752  * Cursor for iterating over a set of volume location servers.
753  */
754 struct afs_vl_cursor {
755         struct afs_addr_cursor  ac;
756         struct afs_cell         *cell;          /* The cell we're querying */
757         struct afs_vlserver_list *server_list;  /* Current server list (pins ref) */
758         struct afs_vlserver     *server;        /* Server on which this resides */
759         struct key              *key;           /* Key for the server */
760         unsigned long           untried;        /* Bitmask of untried servers */
761         short                   index;          /* Current server */
762         short                   error;
763         unsigned short          flags;
764 #define AFS_VL_CURSOR_STOP      0x0001          /* Set to cease iteration */
765 #define AFS_VL_CURSOR_RETRY     0x0002          /* Set to do a retry */
766 #define AFS_VL_CURSOR_RETRIED   0x0004          /* Set if started a retry */
767         unsigned short          nr_iterations;  /* Number of server iterations */
768 };
769 
770 /*
771  * Cursor for iterating over a set of fileservers.
772  */
773 struct afs_fs_cursor {
774         const struct afs_call_type *type;       /* Type of call done */
775         struct afs_addr_cursor  ac;
776         struct afs_vnode        *vnode;
777         struct afs_server_list  *server_list;   /* Current server list (pins ref) */
778         struct afs_cb_interest  *cbi;           /* Server on which this resides (pins ref) */
779         struct key              *key;           /* Key for the server */
780         unsigned long           untried;        /* Bitmask of untried servers */
781         unsigned int            cb_break;       /* cb_break + cb_s_break before the call */
782         unsigned int            cb_break_2;     /* cb_break + cb_s_break (2nd vnode) */
783         short                   index;          /* Current server */
784         short                   error;
785         unsigned short          flags;
786 #define AFS_FS_CURSOR_STOP      0x0001          /* Set to cease iteration */
787 #define AFS_FS_CURSOR_VBUSY     0x0002          /* Set if seen VBUSY */
788 #define AFS_FS_CURSOR_VMOVED    0x0004          /* Set if seen VMOVED */
789 #define AFS_FS_CURSOR_VNOVOL    0x0008          /* Set if seen VNOVOL */
790 #define AFS_FS_CURSOR_CUR_ONLY  0x0010          /* Set if current server only (file lock held) */
791 #define AFS_FS_CURSOR_NO_VSLEEP 0x0020          /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
792 #define AFS_FS_CURSOR_INTR      0x0040          /* Set if op is interruptible */
793         unsigned short          nr_iterations;  /* Number of server iterations */
794 };
795 
796 /*
797  * Cache auxiliary data.
798  */
799 struct afs_vnode_cache_aux {
800         u64                     data_version;
801 } __packed;
802 
803 #include <trace/events/afs.h>
804 
805 /*****************************************************************************/
806 /*
807  * addr_list.c
808  */
809 static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
810 {
811         if (alist)
812                 refcount_inc(&alist->usage);
813         return alist;
814 }
815 extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
816                                                 unsigned short,
817                                                 unsigned short);
818 extern void afs_put_addrlist(struct afs_addr_list *);
819 extern struct afs_vlserver_list *afs_parse_text_addrs(struct afs_net *,
820                                                       const char *, size_t, char,
821                                                       unsigned short, unsigned short);
822 extern struct afs_vlserver_list *afs_dns_query(struct afs_cell *, time64_t *);
823 extern bool afs_iterate_addresses(struct afs_addr_cursor *);
824 extern int afs_end_cursor(struct afs_addr_cursor *);
825 
826 extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
827 extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
828 
829 /*
830  * cache.c
831  */
832 #ifdef CONFIG_AFS_FSCACHE
833 extern struct fscache_netfs afs_cache_netfs;
834 extern struct fscache_cookie_def afs_cell_cache_index_def;
835 extern struct fscache_cookie_def afs_volume_cache_index_def;
836 extern struct fscache_cookie_def afs_vnode_cache_index_def;
837 #else
838 #define afs_cell_cache_index_def        (*(struct fscache_cookie_def *) NULL)
839 #define afs_volume_cache_index_def      (*(struct fscache_cookie_def *) NULL)
840 #define afs_vnode_cache_index_def       (*(struct fscache_cookie_def *) NULL)
841 #endif
842 
843 /*
844  * callback.c
845  */
846 extern void afs_init_callback_state(struct afs_server *);
847 extern void __afs_break_callback(struct afs_vnode *);
848 extern void afs_break_callback(struct afs_vnode *);
849 extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*);
850 
851 extern int afs_register_server_cb_interest(struct afs_vnode *,
852                                            struct afs_server_list *, unsigned int);
853 extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *);
854 extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *);
855 
856 static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi)
857 {
858         if (cbi)
859                 refcount_inc(&cbi->usage);
860         return cbi;
861 }
862 
863 static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
864 {
865         return vnode->cb_break + vnode->cb_v_break;
866 }
867 
868 static inline bool afs_cb_is_broken(unsigned int cb_break,
869                                     const struct afs_vnode *vnode,
870                                     const struct afs_cb_interest *cbi)
871 {
872         return !cbi || cb_break != (vnode->cb_break +
873                                     vnode->volume->cb_v_break);
874 }
875 
876 /*
877  * cell.c
878  */
879 extern int afs_cell_init(struct afs_net *, const char *);
880 extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned);
881 extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
882                                         const char *, bool);
883 extern struct afs_cell *afs_get_cell(struct afs_cell *);
884 extern void afs_put_cell(struct afs_net *, struct afs_cell *);
885 extern void afs_manage_cells(struct work_struct *);
886 extern void afs_cells_timer(struct timer_list *);
887 extern void __net_exit afs_cell_purge(struct afs_net *);
888 
889 /*
890  * cmservice.c
891  */
892 extern bool afs_cm_incoming_call(struct afs_call *);
893 
894 /*
895  * dir.c
896  */
897 extern const struct file_operations afs_dir_file_operations;
898 extern const struct inode_operations afs_dir_inode_operations;
899 extern const struct address_space_operations afs_dir_aops;
900 extern const struct dentry_operations afs_fs_dentry_operations;
901 
902 extern void afs_d_release(struct dentry *);
903 
904 /*
905  * dir_edit.c
906  */
907 extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
908                              enum afs_edit_dir_reason);
909 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
910 
911 /*
912  * dir_silly.c
913  */
914 extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
915                            struct dentry *, struct key *);
916 extern int afs_silly_iput(struct dentry *, struct inode *);
917 
918 /*
919  * dynroot.c
920  */
921 extern const struct file_operations afs_dynroot_file_operations;
922 extern const struct inode_operations afs_dynroot_inode_operations;
923 extern const struct dentry_operations afs_dynroot_dentry_operations;
924 
925 extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
926 extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
927 extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
928 extern int afs_dynroot_populate(struct super_block *);
929 extern void afs_dynroot_depopulate(struct super_block *);
930 
931 /*
932  * file.c
933  */
934 extern const struct address_space_operations afs_fs_aops;
935 extern const struct inode_operations afs_file_inode_operations;
936 extern const struct file_operations afs_file_operations;
937 
938 extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
939 extern void afs_put_wb_key(struct afs_wb_key *);
940 extern int afs_open(struct inode *, struct file *);
941 extern int afs_release(struct inode *, struct file *);
942 extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *);
943 extern int afs_page_filler(void *, struct page *);
944 extern void afs_put_read(struct afs_read *);
945 
946 /*
947  * flock.c
948  */
949 extern struct workqueue_struct *afs_lock_manager;
950 
951 extern void afs_lock_op_done(struct afs_call *);
952 extern void afs_lock_work(struct work_struct *);
953 extern void afs_lock_may_be_available(struct afs_vnode *);
954 extern int afs_lock(struct file *, int, struct file_lock *);
955 extern int afs_flock(struct file *, int, struct file_lock *);
956 
957 /*
958  * fsclient.c
959  */
960 extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *,
961                                     struct afs_volsync *);
962 extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *);
963 extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *);
964 extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t,
965                          struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *);
966 extern int afs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool,
967                          struct afs_status_cb *);
968 extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *,
969                        struct afs_status_cb *, struct afs_status_cb *);
970 extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *,
971                           struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *);
972 extern int afs_fs_rename(struct afs_fs_cursor *, const char *,
973                          struct afs_vnode *, const char *,
974                          struct afs_status_cb *, struct afs_status_cb *);
975 extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *,
976                              pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *);
977 extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *);
978 extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *);
979 extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *);
980 extern int afs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *);
981 extern int afs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *);
982 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
983                                         struct afs_addr_cursor *, struct key *);
984 extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
985                                                 struct afs_addr_cursor *, struct key *,
986                                                 unsigned int);
987 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
988                                      struct afs_fid *, struct afs_status_cb *,
989                                      unsigned int, struct afs_volsync *);
990 extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *,
991                                struct afs_fid *, struct afs_status_cb *,
992                                struct afs_volsync *);
993 
994 struct afs_acl {
995         u32     size;
996         u8      data[];
997 };
998 
999 extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *, struct afs_status_cb *);
1000 extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *,
1001                             struct afs_status_cb *);
1002 
1003 /*
1004  * fs_probe.c
1005  */
1006 extern void afs_fileserver_probe_result(struct afs_call *);
1007 extern int afs_probe_fileservers(struct afs_net *, struct key *, struct afs_server_list *);
1008 extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
1009 
1010 /*
1011  * inode.c
1012  */
1013 extern void afs_vnode_commit_status(struct afs_fs_cursor *,
1014                                     struct afs_vnode *,
1015                                     unsigned int,
1016                                     const afs_dataversion_t *,
1017                                     struct afs_status_cb *);
1018 extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
1019 extern int afs_iget5_test(struct inode *, void *);
1020 extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
1021 extern struct inode *afs_iget(struct super_block *, struct key *,
1022                               struct afs_iget_data *, struct afs_status_cb *,
1023                               struct afs_cb_interest *,
1024                               struct afs_vnode *);
1025 extern void afs_zap_data(struct afs_vnode *);
1026 extern bool afs_check_validity(struct afs_vnode *);
1027 extern int afs_validate(struct afs_vnode *, struct key *);
1028 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
1029 extern int afs_setattr(struct dentry *, struct iattr *);
1030 extern void afs_evict_inode(struct inode *);
1031 extern int afs_drop_inode(struct inode *);
1032 
1033 /*
1034  * main.c
1035  */
1036 extern struct workqueue_struct *afs_wq;
1037 extern int afs_net_id;
1038 
1039 static inline struct afs_net *afs_net(struct net *net)
1040 {
1041         return net_generic(net, afs_net_id);
1042 }
1043 
1044 static inline struct afs_net *afs_sb2net(struct super_block *sb)
1045 {
1046         return afs_net(AFS_FS_S(sb)->net_ns);
1047 }
1048 
1049 static inline struct afs_net *afs_d2net(struct dentry *dentry)
1050 {
1051         return afs_sb2net(dentry->d_sb);
1052 }
1053 
1054 static inline struct afs_net *afs_i2net(struct inode *inode)
1055 {
1056         return afs_sb2net(inode->i_sb);
1057 }
1058 
1059 static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
1060 {
1061         return afs_i2net(&vnode->vfs_inode);
1062 }
1063 
1064 static inline struct afs_net *afs_sock2net(struct sock *sk)
1065 {
1066         return net_generic(sock_net(sk), afs_net_id);
1067 }
1068 
1069 static inline void __afs_stat(atomic_t *s)
1070 {
1071         atomic_inc(s);
1072 }
1073 
1074 #define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
1075 
1076 /*
1077  * misc.c
1078  */
1079 extern int afs_abort_to_error(u32);
1080 extern void afs_prioritise_error(struct afs_error *, int, u32);
1081 
1082 /*
1083  * mntpt.c
1084  */
1085 extern const struct inode_operations afs_mntpt_inode_operations;
1086 extern const struct inode_operations afs_autocell_inode_operations;
1087 extern const struct file_operations afs_mntpt_file_operations;
1088 
1089 extern struct vfsmount *afs_d_automount(struct path *);
1090 extern void afs_mntpt_kill_timer(void);
1091 
1092 /*
1093  * netdevices.c
1094  */
1095 extern int afs_get_ipv4_interfaces(struct afs_net *, struct afs_interface *,
1096                                    size_t, bool);
1097 
1098 /*
1099  * proc.c
1100  */
1101 #ifdef CONFIG_PROC_FS
1102 extern int __net_init afs_proc_init(struct afs_net *);
1103 extern void __net_exit afs_proc_cleanup(struct afs_net *);
1104 extern int afs_proc_cell_setup(struct afs_cell *);
1105 extern void afs_proc_cell_remove(struct afs_cell *);
1106 extern void afs_put_sysnames(struct afs_sysnames *);
1107 #else
1108 static inline int afs_proc_init(struct afs_net *net) { return 0; }
1109 static inline void afs_proc_cleanup(struct afs_net *net) {}
1110 static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
1111 static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
1112 static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
1113 #endif
1114 
1115 /*
1116  * rotate.c
1117  */
1118 extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *,
1119                                       struct key *, bool);
1120 extern bool afs_select_fileserver(struct afs_fs_cursor *);
1121 extern bool afs_select_current_fileserver(struct afs_fs_cursor *);
1122 extern int afs_end_vnode_operation(struct afs_fs_cursor *);
1123 
1124 /*
1125  * rxrpc.c
1126  */
1127 extern struct workqueue_struct *afs_async_calls;
1128 
1129 extern int __net_init afs_open_socket(struct afs_net *);
1130 extern void __net_exit afs_close_socket(struct afs_net *);
1131 extern void afs_charge_preallocation(struct work_struct *);
1132 extern void afs_put_call(struct afs_call *);
1133 extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
1134 extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
1135 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
1136                                             const struct afs_call_type *,
1137                                             size_t, size_t);
1138 extern void afs_flat_call_destructor(struct afs_call *);
1139 extern void afs_send_empty_reply(struct afs_call *);
1140 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
1141 extern int afs_extract_data(struct afs_call *, bool);
1142 extern int afs_protocol_error(struct afs_call *, int, enum afs_eproto_cause);
1143 
1144 static inline void afs_set_fc_call(struct afs_call *call, struct afs_fs_cursor *fc)
1145 {
1146         call->intr = fc->flags & AFS_FS_CURSOR_INTR;
1147         fc->type = call->type;
1148 }
1149 
1150 static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
1151 {
1152         call->kvec[0].iov_base = buf;
1153         call->kvec[0].iov_len = size;
1154         iov_iter_kvec(&call->iter, READ, call->kvec, 1, size);
1155 }
1156 
1157 static inline void afs_extract_to_tmp(struct afs_call *call)
1158 {
1159         afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
1160 }
1161 
1162 static inline void afs_extract_to_tmp64(struct afs_call *call)
1163 {
1164         afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
1165 }
1166 
1167 static inline void afs_extract_discard(struct afs_call *call, size_t size)
1168 {
1169         iov_iter_discard(&call->iter, READ, size);
1170 }
1171 
1172 static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
1173 {
1174         afs_extract_begin(call, call->buffer, size);
1175 }
1176 
1177 static inline int afs_transfer_reply(struct afs_call *call)
1178 {
1179         return afs_extract_data(call, false);
1180 }
1181 
1182 static inline bool afs_check_call_state(struct afs_call *call,
1183                                         enum afs_call_state state)
1184 {
1185         return READ_ONCE(call->state) == state;
1186 }
1187 
1188 static inline bool afs_set_call_state(struct afs_call *call,
1189                                       enum afs_call_state from,
1190                                       enum afs_call_state to)
1191 {
1192         bool ok = false;
1193 
1194         spin_lock_bh(&call->state_lock);
1195         if (call->state == from) {
1196                 call->state = to;
1197                 trace_afs_call_state(call, from, to, 0, 0);
1198                 ok = true;
1199         }
1200         spin_unlock_bh(&call->state_lock);
1201         return ok;
1202 }
1203 
1204 static inline void afs_set_call_complete(struct afs_call *call,
1205                                          int error, u32 remote_abort)
1206 {
1207         enum afs_call_state state;
1208         bool ok = false;
1209 
1210         spin_lock_bh(&call->state_lock);
1211         state = call->state;
1212         if (state != AFS_CALL_COMPLETE) {
1213                 call->abort_code = remote_abort;
1214                 call->error = error;
1215                 call->state = AFS_CALL_COMPLETE;
1216                 trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
1217                                      error, remote_abort);
1218                 ok = true;
1219         }
1220         spin_unlock_bh(&call->state_lock);
1221         if (ok)
1222                 trace_afs_call_done(call);
1223 }
1224 
1225 /*
1226  * security.c
1227  */
1228 extern void afs_put_permits(struct afs_permits *);
1229 extern void afs_clear_permits(struct afs_vnode *);
1230 extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int,
1231                              struct afs_status_cb *);
1232 extern void afs_zap_permits(struct rcu_head *);
1233 extern struct key *afs_request_key(struct afs_cell *);
1234 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
1235 extern int afs_permission(struct inode *, int);
1236 extern void __exit afs_clean_up_permit_cache(void);
1237 
1238 /*
1239  * server.c
1240  */
1241 extern spinlock_t afs_server_peer_lock;
1242 
1243 static inline struct afs_server *afs_get_server(struct afs_server *server)
1244 {
1245         atomic_inc(&server->usage);
1246         return server;
1247 }
1248 
1249 extern struct afs_server *afs_find_server(struct afs_net *,
1250                                           const struct sockaddr_rxrpc *);
1251 extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
1252 extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *);
1253 extern void afs_put_server(struct afs_net *, struct afs_server *);
1254 extern void afs_manage_servers(struct work_struct *);
1255 extern void afs_servers_timer(struct timer_list *);
1256 extern void __net_exit afs_purge_servers(struct afs_net *);
1257 extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *);
1258 
1259 /*
1260  * server_list.c
1261  */
1262 static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
1263 {
1264         refcount_inc(&slist->usage);
1265         return slist;
1266 }
1267 
1268 extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
1269 extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
1270                                                      struct afs_vldb_entry *,
1271                                                      u8);
1272 extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
1273 
1274 /*
1275  * super.c
1276  */
1277 extern int __init afs_fs_init(void);
1278 extern void afs_fs_exit(void);
1279 
1280 /*
1281  * vlclient.c
1282  */
1283 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
1284                                                          const char *, int);
1285 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
1286 extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
1287                                                 struct key *, struct afs_vlserver *, unsigned int);
1288 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
1289 
1290 /*
1291  * vl_probe.c
1292  */
1293 extern void afs_vlserver_probe_result(struct afs_call *);
1294 extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
1295 extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
1296 
1297 /*
1298  * vl_rotate.c
1299  */
1300 extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
1301                                          struct afs_cell *, struct key *);
1302 extern bool afs_select_vlserver(struct afs_vl_cursor *);
1303 extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
1304 extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
1305 
1306 /*
1307  * vlserver_list.c
1308  */
1309 static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
1310 {
1311         atomic_inc(&vlserver->usage);
1312         return vlserver;
1313 }
1314 
1315 static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
1316 {
1317         if (vllist)
1318                 atomic_inc(&vllist->usage);
1319         return vllist;
1320 }
1321 
1322 extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
1323 extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
1324 extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
1325 extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
1326 extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
1327                                                            const void *, size_t);
1328 
1329 /*
1330  * volume.c
1331  */
1332 static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume)
1333 {
1334         if (volume)
1335                 atomic_inc(&volume->usage);
1336         return volume;
1337 }
1338 
1339 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
1340 extern void afs_activate_volume(struct afs_volume *);
1341 extern void afs_deactivate_volume(struct afs_volume *);
1342 extern void afs_put_volume(struct afs_cell *, struct afs_volume *);
1343 extern int afs_check_volume_status(struct afs_volume *, struct key *);
1344 
1345 /*
1346  * write.c
1347  */
1348 extern int afs_set_page_dirty(struct page *);
1349 extern int afs_write_begin(struct file *file, struct address_space *mapping,
1350                         loff_t pos, unsigned len, unsigned flags,
1351                         struct page **pagep, void **fsdata);
1352 extern int afs_write_end(struct file *file, struct address_space *mapping,
1353                         loff_t pos, unsigned len, unsigned copied,
1354                         struct page *page, void *fsdata);
1355 extern int afs_writepage(struct page *, struct writeback_control *);
1356 extern int afs_writepages(struct address_space *, struct writeback_control *);
1357 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
1358 extern int afs_fsync(struct file *, loff_t, loff_t, int);
1359 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
1360 extern void afs_prune_wb_keys(struct afs_vnode *);
1361 extern int afs_launder_page(struct page *);
1362 
1363 /*
1364  * xattr.c
1365  */
1366 extern const struct xattr_handler *afs_xattr_handlers[];
1367 extern ssize_t afs_listxattr(struct dentry *, char *, size_t);
1368 
1369 /*
1370  * yfsclient.c
1371  */
1372 extern int yfs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_status_cb *,
1373                                     struct afs_volsync *);
1374 extern int yfs_fs_fetch_data(struct afs_fs_cursor *, struct afs_status_cb *, struct afs_read *);
1375 extern int yfs_fs_create_file(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *,
1376                               struct afs_fid *, struct afs_status_cb *);
1377 extern int yfs_fs_make_dir(struct afs_fs_cursor *, const char *, umode_t, struct afs_status_cb *,
1378                            struct afs_fid *, struct afs_status_cb *);
1379 extern int yfs_fs_remove_file2(struct afs_fs_cursor *, struct afs_vnode *, const char *,
1380                                struct afs_status_cb *, struct afs_status_cb *);
1381 extern int yfs_fs_remove(struct afs_fs_cursor *, struct afs_vnode *, const char *, bool,
1382                          struct afs_status_cb *);
1383 extern int yfs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *,
1384                        struct afs_status_cb *, struct afs_status_cb *);
1385 extern int yfs_fs_symlink(struct afs_fs_cursor *, const char *, const char *,
1386                           struct afs_status_cb *, struct afs_fid *, struct afs_status_cb *);
1387 extern int yfs_fs_rename(struct afs_fs_cursor *, const char *, struct afs_vnode *, const char *,
1388                          struct afs_status_cb *, struct afs_status_cb *);
1389 extern int yfs_fs_store_data(struct afs_fs_cursor *, struct address_space *,
1390                              pgoff_t, pgoff_t, unsigned, unsigned, struct afs_status_cb *);
1391 extern int yfs_fs_setattr(struct afs_fs_cursor *, struct iattr *, struct afs_status_cb *);
1392 extern int yfs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *);
1393 extern int yfs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t, struct afs_status_cb *);
1394 extern int yfs_fs_extend_lock(struct afs_fs_cursor *, struct afs_status_cb *);
1395 extern int yfs_fs_release_lock(struct afs_fs_cursor *, struct afs_status_cb *);
1396 extern int yfs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *,
1397                                struct afs_fid *, struct afs_status_cb *,
1398                                struct afs_volsync *);
1399 extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
1400                                      struct afs_fid *, struct afs_status_cb *,
1401                                      unsigned int, struct afs_volsync *);
1402 
1403 struct yfs_acl {
1404         struct afs_acl  *acl;           /* Dir/file/symlink ACL */
1405         struct afs_acl  *vol_acl;       /* Whole volume ACL */
1406         u32             inherit_flag;   /* True if ACL is inherited from parent dir */
1407         u32             num_cleaned;    /* Number of ACEs removed due to subject removal */
1408         unsigned int    flags;
1409 #define YFS_ACL_WANT_ACL        0x01    /* Set if caller wants ->acl */
1410 #define YFS_ACL_WANT_VOL_ACL    0x02    /* Set if caller wants ->vol_acl */
1411 };
1412 
1413 extern void yfs_free_opaque_acl(struct yfs_acl *);
1414 extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, struct yfs_acl *,
1415                                                struct afs_status_cb *);
1416 extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *,
1417                                     struct afs_status_cb *);
1418 
1419 /*
1420  * Miscellaneous inline functions.
1421  */
1422 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
1423 {
1424         return container_of(inode, struct afs_vnode, vfs_inode);
1425 }
1426 
1427 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
1428 {
1429         return &vnode->vfs_inode;
1430 }
1431 
1432 static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc,
1433                                                  struct afs_vnode *vnode)
1434 {
1435         if (fc->ac.error == -ENOENT) {
1436                 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1437                 afs_break_callback(vnode);
1438         }
1439 }
1440 
1441 static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
1442 {
1443         trace_afs_io_error(call->debug_id, -EIO, where);
1444         return -EIO;
1445 }
1446 
1447 static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
1448 {
1449         trace_afs_file_error(vnode, -EIO, where);
1450         return -EIO;
1451 }
1452 
1453 /*****************************************************************************/
1454 /*
1455  * debug tracing
1456  */
1457 extern unsigned afs_debug;
1458 
1459 #define dbgprintk(FMT,...) \
1460         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1461 
1462 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1463 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1464 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1465 
1466 
1467 #if defined(__KDEBUG)
1468 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1469 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1470 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1471 
1472 #elif defined(CONFIG_AFS_DEBUG)
1473 #define AFS_DEBUG_KENTER        0x01
1474 #define AFS_DEBUG_KLEAVE        0x02
1475 #define AFS_DEBUG_KDEBUG        0x04
1476 
1477 #define _enter(FMT,...)                                 \
1478 do {                                                    \
1479         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
1480                 kenter(FMT,##__VA_ARGS__);              \
1481 } while (0)
1482 
1483 #define _leave(FMT,...)                                 \
1484 do {                                                    \
1485         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
1486                 kleave(FMT,##__VA_ARGS__);              \
1487 } while (0)
1488 
1489 #define _debug(FMT,...)                                 \
1490 do {                                                    \
1491         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
1492                 kdebug(FMT,##__VA_ARGS__);              \
1493 } while (0)
1494 
1495 #else
1496 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1497 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1498 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1499 #endif
1500 
1501 /*
1502  * debug assertion checking
1503  */
1504 #if 1 // defined(__KDEBUGALL)
1505 
1506 #define ASSERT(X)                                               \
1507 do {                                                            \
1508         if (unlikely(!(X))) {                                   \
1509                 printk(KERN_ERR "\n");                          \
1510                 printk(KERN_ERR "AFS: Assertion failed\n");     \
1511                 BUG();                                          \
1512         }                                                       \
1513 } while(0)
1514 
1515 #define ASSERTCMP(X, OP, Y)                                             \
1516 do {                                                                    \
1517         if (unlikely(!((X) OP (Y)))) {                                  \
1518                 printk(KERN_ERR "\n");                                  \
1519                 printk(KERN_ERR "AFS: Assertion failed\n");             \
1520                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
1521                        (unsigned long)(X), (unsigned long)(Y));         \
1522                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
1523                        (unsigned long)(X), (unsigned long)(Y));         \
1524                 BUG();                                                  \
1525         }                                                               \
1526 } while(0)
1527 
1528 #define ASSERTRANGE(L, OP1, N, OP2, H)                                  \
1529 do {                                                                    \
1530         if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {               \
1531                 printk(KERN_ERR "\n");                                  \
1532                 printk(KERN_ERR "AFS: Assertion failed\n");             \
1533                 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
1534                        (unsigned long)(L), (unsigned long)(N),          \
1535                        (unsigned long)(H));                             \
1536                 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
1537                        (unsigned long)(L), (unsigned long)(N),          \
1538                        (unsigned long)(H));                             \
1539                 BUG();                                                  \
1540         }                                                               \
1541 } while(0)
1542 
1543 #define ASSERTIF(C, X)                                          \
1544 do {                                                            \
1545         if (unlikely((C) && !(X))) {                            \
1546                 printk(KERN_ERR "\n");                          \
1547                 printk(KERN_ERR "AFS: Assertion failed\n");     \
1548                 BUG();                                          \
1549         }                                                       \
1550 } while(0)
1551 
1552 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1553 do {                                                                    \
1554         if (unlikely((C) && !((X) OP (Y)))) {                           \
1555                 printk(KERN_ERR "\n");                                  \
1556                 printk(KERN_ERR "AFS: Assertion failed\n");             \
1557                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
1558                        (unsigned long)(X), (unsigned long)(Y));         \
1559                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
1560                        (unsigned long)(X), (unsigned long)(Y));         \
1561                 BUG();                                                  \
1562         }                                                               \
1563 } while(0)
1564 
1565 #else
1566 
1567 #define ASSERT(X)                               \
1568 do {                                            \
1569 } while(0)
1570 
1571 #define ASSERTCMP(X, OP, Y)                     \
1572 do {                                            \
1573 } while(0)
1574 
1575 #define ASSERTRANGE(L, OP1, N, OP2, H)          \
1576 do {                                            \
1577 } while(0)
1578 
1579 #define ASSERTIF(C, X)                          \
1580 do {                                            \
1581 } while(0)
1582 
1583 #define ASSERTIFCMP(C, X, OP, Y)                \
1584 do {                                            \
1585 } while(0)
1586 
1587 #endif /* __KDEBUGALL */
1588 

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