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

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  1 /* internal AFS stuff
  2  *
  3  * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/compiler.h>
 13 #include <linux/kernel.h>
 14 #include <linux/ktime.h>
 15 #include <linux/fs.h>
 16 #include <linux/pagemap.h>
 17 #include <linux/rxrpc.h>
 18 #include <linux/key.h>
 19 #include <linux/workqueue.h>
 20 #include <linux/sched.h>
 21 #include <linux/fscache.h>
 22 #include <linux/backing-dev.h>
 23 #include <linux/uuid.h>
 24 #include <net/af_rxrpc.h>
 25 
 26 #include "afs.h"
 27 #include "afs_vl.h"
 28 
 29 #define AFS_CELL_MAX_ADDRS 15
 30 
 31 struct pagevec;
 32 struct afs_call;
 33 
 34 typedef enum {
 35         AFS_VL_NEW,                     /* new, uninitialised record */
 36         AFS_VL_CREATING,                /* creating record */
 37         AFS_VL_VALID,                   /* record is pending */
 38         AFS_VL_NO_VOLUME,               /* no such volume available */
 39         AFS_VL_UPDATING,                /* update in progress */
 40         AFS_VL_VOLUME_DELETED,          /* volume was deleted */
 41         AFS_VL_UNCERTAIN,               /* uncertain state (update failed) */
 42 } __attribute__((packed)) afs_vlocation_state_t;
 43 
 44 struct afs_mount_params {
 45         bool                    rwpath;         /* T if the parent should be considered R/W */
 46         bool                    force;          /* T to force cell type */
 47         bool                    autocell;       /* T if set auto mount operation */
 48         afs_voltype_t           type;           /* type of volume requested */
 49         int                     volnamesz;      /* size of volume name */
 50         const char              *volname;       /* name of volume to mount */
 51         struct afs_cell         *cell;          /* cell in which to find volume */
 52         struct afs_volume       *volume;        /* volume record */
 53         struct key              *key;           /* key to use for secure mounting */
 54 };
 55 
 56 enum afs_call_state {
 57         AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
 58         AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
 59         AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
 60         AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
 61         AFS_CALL_REPLYING,      /* replying to incoming call */
 62         AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
 63         AFS_CALL_COMPLETE,      /* Completed or failed */
 64 };
 65 /*
 66  * a record of an in-progress RxRPC call
 67  */
 68 struct afs_call {
 69         const struct afs_call_type *type;       /* type of call */
 70         wait_queue_head_t       waitq;          /* processes awaiting completion */
 71         struct work_struct      async_work;     /* async I/O processor */
 72         struct work_struct      work;           /* actual work processor */
 73         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
 74         struct key              *key;           /* security for this call */
 75         struct afs_server       *server;        /* server affected by incoming CM call */
 76         void                    *request;       /* request data (first part) */
 77         struct address_space    *mapping;       /* page set */
 78         struct afs_writeback    *wb;            /* writeback being performed */
 79         void                    *buffer;        /* reply receive buffer */
 80         void                    *reply;         /* reply buffer (first part) */
 81         void                    *reply2;        /* reply buffer (second part) */
 82         void                    *reply3;        /* reply buffer (third part) */
 83         void                    *reply4;        /* reply buffer (fourth part) */
 84         pgoff_t                 first;          /* first page in mapping to deal with */
 85         pgoff_t                 last;           /* last page in mapping to deal with */
 86         size_t                  offset;         /* offset into received data store */
 87         atomic_t                usage;
 88         enum afs_call_state     state;
 89         int                     error;          /* error code */
 90         u32                     abort_code;     /* Remote abort ID or 0 */
 91         unsigned                request_size;   /* size of request data */
 92         unsigned                reply_max;      /* maximum size of reply */
 93         unsigned                first_offset;   /* offset into mapping[first] */
 94         union {
 95                 unsigned        last_to;        /* amount of mapping[last] */
 96                 unsigned        count2;         /* count used in unmarshalling */
 97         };
 98         unsigned char           unmarshall;     /* unmarshalling phase */
 99         bool                    incoming;       /* T if incoming call */
100         bool                    send_pages;     /* T if data from mapping should be sent */
101         bool                    need_attention; /* T if RxRPC poked us */
102         bool                    async;          /* T if asynchronous */
103         u16                     service_id;     /* RxRPC service ID to call */
104         __be16                  port;           /* target UDP port */
105         u32                     operation_ID;   /* operation ID for an incoming call */
106         u32                     count;          /* count for use in unmarshalling */
107         __be32                  tmp;            /* place to extract temporary data */
108         afs_dataversion_t       store_version;  /* updated version expected from store */
109 };
110 
111 struct afs_call_type {
112         const char *name;
113 
114         /* deliver request or reply data to an call
115          * - returning an error will cause the call to be aborted
116          */
117         int (*deliver)(struct afs_call *call);
118 
119         /* map an abort code to an error number */
120         int (*abort_to_error)(u32 abort_code);
121 
122         /* clean up a call */
123         void (*destructor)(struct afs_call *call);
124 
125         /* Work function */
126         void (*work)(struct work_struct *work);
127 };
128 
129 /*
130  * Record of an outstanding read operation on a vnode.
131  */
132 struct afs_read {
133         loff_t                  pos;            /* Where to start reading */
134         loff_t                  len;            /* How much we're asking for */
135         loff_t                  actual_len;     /* How much we're actually getting */
136         loff_t                  remain;         /* Amount remaining */
137         atomic_t                usage;
138         unsigned int            index;          /* Which page we're reading into */
139         unsigned int            nr_pages;
140         void (*page_done)(struct afs_call *, struct afs_read *);
141         struct page             *pages[];
142 };
143 
144 /*
145  * record of an outstanding writeback on a vnode
146  */
147 struct afs_writeback {
148         struct list_head        link;           /* link in vnode->writebacks */
149         struct work_struct      writer;         /* work item to perform the writeback */
150         struct afs_vnode        *vnode;         /* vnode to which this write applies */
151         struct key              *key;           /* owner of this write */
152         wait_queue_head_t       waitq;          /* completion and ready wait queue */
153         pgoff_t                 first;          /* first page in batch */
154         pgoff_t                 point;          /* last page in current store op */
155         pgoff_t                 last;           /* last page in batch (inclusive) */
156         unsigned                offset_first;   /* offset into first page of start of write */
157         unsigned                to_last;        /* offset into last page of end of write */
158         int                     num_conflicts;  /* count of conflicting writes in list */
159         int                     usage;
160         bool                    conflicts;      /* T if has dependent conflicts */
161         enum {
162                 AFS_WBACK_SYNCING,              /* synchronisation being performed */
163                 AFS_WBACK_PENDING,              /* write pending */
164                 AFS_WBACK_CONFLICTING,          /* conflicting writes posted */
165                 AFS_WBACK_WRITING,              /* writing back */
166                 AFS_WBACK_COMPLETE              /* the writeback record has been unlinked */
167         } state __attribute__((packed));
168 };
169 
170 /*
171  * AFS superblock private data
172  * - there's one superblock per volume
173  */
174 struct afs_super_info {
175         struct afs_volume       *volume;        /* volume record */
176         char                    rwparent;       /* T if parent is R/W AFS volume */
177 };
178 
179 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
180 {
181         return sb->s_fs_info;
182 }
183 
184 extern struct file_system_type afs_fs_type;
185 
186 /*
187  * entry in the cached cell catalogue
188  */
189 struct afs_cache_cell {
190         char            name[AFS_MAXCELLNAME];  /* cell name (padded with NULs) */
191         struct in_addr  vl_servers[15];         /* cached cell VL servers */
192 };
193 
194 /*
195  * AFS cell record
196  */
197 struct afs_cell {
198         atomic_t                usage;
199         struct list_head        link;           /* main cell list link */
200         struct key              *anonymous_key; /* anonymous user key for this cell */
201         struct list_head        proc_link;      /* /proc cell list link */
202 #ifdef CONFIG_AFS_FSCACHE
203         struct fscache_cookie   *cache;         /* caching cookie */
204 #endif
205 
206         /* server record management */
207         rwlock_t                servers_lock;   /* active server list lock */
208         struct list_head        servers;        /* active server list */
209 
210         /* volume location record management */
211         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
212         struct list_head        vl_list;        /* cell's active VL record list */
213         spinlock_t              vl_lock;        /* vl_list lock */
214         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
215         unsigned short          vl_curr_svix;   /* current server index */
216         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
217 
218         char                    name[0];        /* cell name - must go last */
219 };
220 
221 /*
222  * entry in the cached volume location catalogue
223  */
224 struct afs_cache_vlocation {
225         /* volume name (lowercase, padded with NULs) */
226         uint8_t                 name[AFS_MAXVOLNAME + 1];
227 
228         uint8_t                 nservers;       /* number of entries used in servers[] */
229         uint8_t                 vidmask;        /* voltype mask for vid[] */
230         uint8_t                 srvtmask[8];    /* voltype masks for servers[] */
231 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
232 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
233 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
234 
235         afs_volid_t             vid[3];         /* volume IDs for R/W, R/O and Bak volumes */
236         struct in_addr          servers[8];     /* fileserver addresses */
237         time_t                  rtime;          /* last retrieval time */
238 };
239 
240 /*
241  * volume -> vnode hash table entry
242  */
243 struct afs_cache_vhash {
244         afs_voltype_t           vtype;          /* which volume variation */
245         uint8_t                 hash_bucket;    /* which hash bucket this represents */
246 } __attribute__((packed));
247 
248 /*
249  * AFS volume location record
250  */
251 struct afs_vlocation {
252         atomic_t                usage;
253         time64_t                time_of_death;  /* time at which put reduced usage to 0 */
254         struct list_head        link;           /* link in cell volume location list */
255         struct list_head        grave;          /* link in master graveyard list */
256         struct list_head        update;         /* link in master update list */
257         struct afs_cell         *cell;          /* cell to which volume belongs */
258 #ifdef CONFIG_AFS_FSCACHE
259         struct fscache_cookie   *cache;         /* caching cookie */
260 #endif
261         struct afs_cache_vlocation vldb;        /* volume information DB record */
262         struct afs_volume       *vols[3];       /* volume access record pointer (index by type) */
263         wait_queue_head_t       waitq;          /* status change waitqueue */
264         time64_t                update_at;      /* time at which record should be updated */
265         spinlock_t              lock;           /* access lock */
266         afs_vlocation_state_t   state;          /* volume location state */
267         unsigned short          upd_rej_cnt;    /* ENOMEDIUM count during update */
268         unsigned short          upd_busy_cnt;   /* EBUSY count during update */
269         bool                    valid;          /* T if valid */
270 };
271 
272 /*
273  * AFS fileserver record
274  */
275 struct afs_server {
276         atomic_t                usage;
277         time64_t                time_of_death;  /* time at which put reduced usage to 0 */
278         struct in_addr          addr;           /* server address */
279         struct afs_cell         *cell;          /* cell in which server resides */
280         struct list_head        link;           /* link in cell's server list */
281         struct list_head        grave;          /* link in master graveyard list */
282         struct rb_node          master_rb;      /* link in master by-addr tree */
283         struct rw_semaphore     sem;            /* access lock */
284 
285         /* file service access */
286         struct rb_root          fs_vnodes;      /* vnodes backed by this server (ordered by FID) */
287         unsigned long           fs_act_jif;     /* time at which last activity occurred */
288         unsigned long           fs_dead_jif;    /* time at which no longer to be considered dead */
289         spinlock_t              fs_lock;        /* access lock */
290         int                     fs_state;       /* 0 or reason FS currently marked dead (-errno) */
291 
292         /* callback promise management */
293         struct rb_root          cb_promises;    /* vnode expiration list (ordered earliest first) */
294         struct delayed_work     cb_updater;     /* callback updater */
295         struct delayed_work     cb_break_work;  /* collected break dispatcher */
296         wait_queue_head_t       cb_break_waitq; /* space available in cb_break waitqueue */
297         spinlock_t              cb_lock;        /* access lock */
298         struct afs_callback     cb_break[64];   /* ring of callbacks awaiting breaking */
299         atomic_t                cb_break_n;     /* number of pending breaks */
300         u8                      cb_break_head;  /* head of callback breaking ring */
301         u8                      cb_break_tail;  /* tail of callback breaking ring */
302 };
303 
304 /*
305  * AFS volume access record
306  */
307 struct afs_volume {
308         atomic_t                usage;
309         struct afs_cell         *cell;          /* cell to which belongs (unrefd ptr) */
310         struct afs_vlocation    *vlocation;     /* volume location */
311 #ifdef CONFIG_AFS_FSCACHE
312         struct fscache_cookie   *cache;         /* caching cookie */
313 #endif
314         afs_volid_t             vid;            /* volume ID */
315         afs_voltype_t           type;           /* type of volume */
316         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
317         unsigned short          nservers;       /* number of server slots filled */
318         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
319         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
320         struct rw_semaphore     server_sem;     /* lock for accessing current server */
321         struct backing_dev_info bdi;
322 };
323 
324 /*
325  * vnode catalogue entry
326  */
327 struct afs_cache_vnode {
328         afs_vnodeid_t           vnode_id;       /* vnode ID */
329         unsigned                vnode_unique;   /* vnode ID uniquifier */
330         afs_dataversion_t       data_version;   /* data version */
331 };
332 
333 /*
334  * AFS inode private data
335  */
336 struct afs_vnode {
337         struct inode            vfs_inode;      /* the VFS's inode record */
338 
339         struct afs_volume       *volume;        /* volume on which vnode resides */
340         struct afs_server       *server;        /* server currently supplying this file */
341         struct afs_fid          fid;            /* the file identifier for this inode */
342         struct afs_file_status  status;         /* AFS status info for this file */
343 #ifdef CONFIG_AFS_FSCACHE
344         struct fscache_cookie   *cache;         /* caching cookie */
345 #endif
346         struct afs_permits      *permits;       /* cache of permits so far obtained */
347         struct mutex            permits_lock;   /* lock for altering permits list */
348         struct mutex            validate_lock;  /* lock for validating this vnode */
349         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
350         int                     update_cnt;     /* number of outstanding ops that will update the
351                                                  * status */
352         spinlock_t              writeback_lock; /* lock for writebacks */
353         spinlock_t              lock;           /* waitqueue/flags lock */
354         unsigned long           flags;
355 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
356 #define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
357 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
358 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
359 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
360 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
361 #define AFS_VNODE_LOCKING       6               /* set if waiting for lock on vnode */
362 #define AFS_VNODE_READLOCKED    7               /* set if vnode is read-locked on the server */
363 #define AFS_VNODE_WRITELOCKED   8               /* set if vnode is write-locked on the server */
364 #define AFS_VNODE_UNLOCKING     9               /* set if vnode is being unlocked on the server */
365 #define AFS_VNODE_AUTOCELL      10              /* set if Vnode is an auto mount point */
366 #define AFS_VNODE_PSEUDODIR     11              /* set if Vnode is a pseudo directory */
367 
368         long                    acl_order;      /* ACL check count (callback break count) */
369 
370         struct list_head        writebacks;     /* alterations in pagecache that need writing */
371         struct list_head        pending_locks;  /* locks waiting to be granted */
372         struct list_head        granted_locks;  /* locks granted on this file */
373         struct delayed_work     lock_work;      /* work to be done in locking */
374         struct key              *unlock_key;    /* key to be used in unlocking */
375 
376         /* outstanding callback notification on this file */
377         struct rb_node          server_rb;      /* link in server->fs_vnodes */
378         struct rb_node          cb_promise;     /* link in server->cb_promises */
379         struct work_struct      cb_broken_work; /* work to be done on callback break */
380         time64_t                cb_expires;     /* time at which callback expires */
381         time64_t                cb_expires_at;  /* time used to order cb_promise */
382         unsigned                cb_version;     /* callback version */
383         unsigned                cb_expiry;      /* callback expiry time */
384         afs_callback_type_t     cb_type;        /* type of callback */
385         bool                    cb_promised;    /* true if promise still holds */
386 };
387 
388 /*
389  * cached security record for one user's attempt to access a vnode
390  */
391 struct afs_permit {
392         struct key              *key;           /* RxRPC ticket holding a security context */
393         afs_access_t            access_mask;    /* access mask for this key */
394 };
395 
396 /*
397  * cache of security records from attempts to access a vnode
398  */
399 struct afs_permits {
400         struct rcu_head         rcu;            /* disposal procedure */
401         int                     count;          /* number of records */
402         struct afs_permit       permits[0];     /* the permits so far examined */
403 };
404 
405 /*
406  * record of one of a system's set of network interfaces
407  */
408 struct afs_interface {
409         struct in_addr  address;        /* IPv4 address bound to interface */
410         struct in_addr  netmask;        /* netmask applied to address */
411         unsigned        mtu;            /* MTU of interface */
412 };
413 
414 /*****************************************************************************/
415 /*
416  * cache.c
417  */
418 #ifdef CONFIG_AFS_FSCACHE
419 extern struct fscache_netfs afs_cache_netfs;
420 extern struct fscache_cookie_def afs_cell_cache_index_def;
421 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
422 extern struct fscache_cookie_def afs_volume_cache_index_def;
423 extern struct fscache_cookie_def afs_vnode_cache_index_def;
424 #else
425 #define afs_cell_cache_index_def        (*(struct fscache_cookie_def *) NULL)
426 #define afs_vlocation_cache_index_def   (*(struct fscache_cookie_def *) NULL)
427 #define afs_volume_cache_index_def      (*(struct fscache_cookie_def *) NULL)
428 #define afs_vnode_cache_index_def       (*(struct fscache_cookie_def *) NULL)
429 #endif
430 
431 /*
432  * callback.c
433  */
434 extern void afs_init_callback_state(struct afs_server *);
435 extern void afs_broken_callback_work(struct work_struct *);
436 extern void afs_break_callbacks(struct afs_server *, size_t,
437                                 struct afs_callback[]);
438 extern void afs_discard_callback_on_delete(struct afs_vnode *);
439 extern void afs_give_up_callback(struct afs_vnode *);
440 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
441 extern void afs_flush_callback_breaks(struct afs_server *);
442 extern int __init afs_callback_update_init(void);
443 extern void afs_callback_update_kill(void);
444 
445 /*
446  * cell.c
447  */
448 extern struct rw_semaphore afs_proc_cells_sem;
449 extern struct list_head afs_proc_cells;
450 
451 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
452 extern int afs_cell_init(char *);
453 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool);
454 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool);
455 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
456 extern void afs_put_cell(struct afs_cell *);
457 extern void afs_cell_purge(void);
458 
459 /*
460  * cmservice.c
461  */
462 extern bool afs_cm_incoming_call(struct afs_call *);
463 
464 /*
465  * dir.c
466  */
467 extern const struct inode_operations afs_dir_inode_operations;
468 extern const struct dentry_operations afs_fs_dentry_operations;
469 extern const struct file_operations afs_dir_file_operations;
470 
471 /*
472  * file.c
473  */
474 extern const struct address_space_operations afs_fs_aops;
475 extern const struct inode_operations afs_file_inode_operations;
476 extern const struct file_operations afs_file_operations;
477 
478 extern int afs_open(struct inode *, struct file *);
479 extern int afs_release(struct inode *, struct file *);
480 extern int afs_page_filler(void *, struct page *);
481 extern void afs_put_read(struct afs_read *);
482 
483 /*
484  * flock.c
485  */
486 extern void __exit afs_kill_lock_manager(void);
487 extern void afs_lock_work(struct work_struct *);
488 extern void afs_lock_may_be_available(struct afs_vnode *);
489 extern int afs_lock(struct file *, int, struct file_lock *);
490 extern int afs_flock(struct file *, int, struct file_lock *);
491 
492 /*
493  * fsclient.c
494  */
495 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
496                                     struct afs_vnode *, struct afs_volsync *,
497                                     bool);
498 extern int afs_fs_give_up_callbacks(struct afs_server *, bool);
499 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
500                              struct afs_vnode *, struct afs_read *, bool);
501 extern int afs_fs_create(struct afs_server *, struct key *,
502                          struct afs_vnode *, const char *, umode_t,
503                          struct afs_fid *, struct afs_file_status *,
504                          struct afs_callback *, bool);
505 extern int afs_fs_remove(struct afs_server *, struct key *,
506                          struct afs_vnode *, const char *, bool, bool);
507 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
508                        struct afs_vnode *, const char *, bool);
509 extern int afs_fs_symlink(struct afs_server *, struct key *,
510                           struct afs_vnode *, const char *, const char *,
511                           struct afs_fid *, struct afs_file_status *, bool);
512 extern int afs_fs_rename(struct afs_server *, struct key *,
513                          struct afs_vnode *, const char *,
514                          struct afs_vnode *, const char *, bool);
515 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
516                              pgoff_t, pgoff_t, unsigned, unsigned, bool);
517 extern int afs_fs_setattr(struct afs_server *, struct key *,
518                           struct afs_vnode *, struct iattr *, bool);
519 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
520                                     struct afs_vnode *,
521                                     struct afs_volume_status *, bool);
522 extern int afs_fs_set_lock(struct afs_server *, struct key *,
523                            struct afs_vnode *, afs_lock_type_t, bool);
524 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
525                               struct afs_vnode *, bool);
526 extern int afs_fs_release_lock(struct afs_server *, struct key *,
527                                struct afs_vnode *, bool);
528 
529 /*
530  * inode.c
531  */
532 extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
533                                        struct key *);
534 extern struct inode *afs_iget(struct super_block *, struct key *,
535                               struct afs_fid *, struct afs_file_status *,
536                               struct afs_callback *);
537 extern void afs_zap_data(struct afs_vnode *);
538 extern int afs_validate(struct afs_vnode *, struct key *);
539 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
540 extern int afs_setattr(struct dentry *, struct iattr *);
541 extern void afs_evict_inode(struct inode *);
542 extern int afs_drop_inode(struct inode *);
543 
544 /*
545  * main.c
546  */
547 extern struct workqueue_struct *afs_wq;
548 extern struct uuid_v1 afs_uuid;
549 
550 /*
551  * misc.c
552  */
553 extern int afs_abort_to_error(u32);
554 
555 /*
556  * mntpt.c
557  */
558 extern const struct inode_operations afs_mntpt_inode_operations;
559 extern const struct inode_operations afs_autocell_inode_operations;
560 extern const struct file_operations afs_mntpt_file_operations;
561 
562 extern struct vfsmount *afs_d_automount(struct path *);
563 extern void afs_mntpt_kill_timer(void);
564 
565 /*
566  * netdevices.c
567  */
568 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
569 
570 /*
571  * proc.c
572  */
573 extern int afs_proc_init(void);
574 extern void afs_proc_cleanup(void);
575 extern int afs_proc_cell_setup(struct afs_cell *);
576 extern void afs_proc_cell_remove(struct afs_cell *);
577 
578 /*
579  * rxrpc.c
580  */
581 extern struct socket *afs_socket;
582 extern atomic_t afs_outstanding_calls;
583 
584 extern int afs_open_socket(void);
585 extern void afs_close_socket(void);
586 extern void afs_put_call(struct afs_call *);
587 extern int afs_queue_call_work(struct afs_call *);
588 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, bool);
589 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
590                                             size_t, size_t);
591 extern void afs_flat_call_destructor(struct afs_call *);
592 extern void afs_send_empty_reply(struct afs_call *);
593 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
594 extern int afs_extract_data(struct afs_call *, void *, size_t, bool);
595 
596 static inline int afs_transfer_reply(struct afs_call *call)
597 {
598         return afs_extract_data(call, call->buffer, call->reply_max, false);
599 }
600 
601 /*
602  * security.c
603  */
604 extern void afs_clear_permits(struct afs_vnode *);
605 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
606 extern void afs_zap_permits(struct rcu_head *);
607 extern struct key *afs_request_key(struct afs_cell *);
608 extern int afs_permission(struct inode *, int);
609 
610 /*
611  * server.c
612  */
613 extern spinlock_t afs_server_peer_lock;
614 
615 #define afs_get_server(S)                                       \
616 do {                                                            \
617         _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
618         atomic_inc(&(S)->usage);                                \
619 } while(0)
620 
621 extern struct afs_server *afs_lookup_server(struct afs_cell *,
622                                             const struct in_addr *);
623 extern struct afs_server *afs_find_server(const struct sockaddr_rxrpc *);
624 extern void afs_put_server(struct afs_server *);
625 extern void __exit afs_purge_servers(void);
626 
627 /*
628  * super.c
629  */
630 extern int afs_fs_init(void);
631 extern void afs_fs_exit(void);
632 
633 /*
634  * vlclient.c
635  */
636 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
637                                     const char *, struct afs_cache_vlocation *,
638                                     bool);
639 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
640                                   afs_volid_t, afs_voltype_t,
641                                   struct afs_cache_vlocation *, bool);
642 
643 /*
644  * vlocation.c
645  */
646 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
647 
648 extern int __init afs_vlocation_update_init(void);
649 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
650                                                   struct key *,
651                                                   const char *, size_t);
652 extern void afs_put_vlocation(struct afs_vlocation *);
653 extern void afs_vlocation_purge(void);
654 
655 /*
656  * vnode.c
657  */
658 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
659 {
660         return container_of(inode, struct afs_vnode, vfs_inode);
661 }
662 
663 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
664 {
665         return &vnode->vfs_inode;
666 }
667 
668 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
669                                              struct afs_server *);
670 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
671                                   struct key *);
672 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
673                                 struct afs_read *);
674 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
675                             umode_t, struct afs_fid *, struct afs_file_status *,
676                             struct afs_callback *, struct afs_server **);
677 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
678                             bool);
679 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
680                           const char *);
681 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
682                              const char *, struct afs_fid *,
683                              struct afs_file_status *, struct afs_server **);
684 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
685                             struct key *, const char *, const char *);
686 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
687                                 unsigned, unsigned);
688 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
689 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
690                                        struct afs_volume_status *);
691 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
692                               afs_lock_type_t);
693 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
694 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
695 
696 /*
697  * volume.c
698  */
699 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
700 
701 extern void afs_put_volume(struct afs_volume *);
702 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
703 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
704 extern int afs_volume_release_fileserver(struct afs_vnode *,
705                                          struct afs_server *, int);
706 
707 /*
708  * write.c
709  */
710 extern int afs_set_page_dirty(struct page *);
711 extern void afs_put_writeback(struct afs_writeback *);
712 extern int afs_write_begin(struct file *file, struct address_space *mapping,
713                         loff_t pos, unsigned len, unsigned flags,
714                         struct page **pagep, void **fsdata);
715 extern int afs_write_end(struct file *file, struct address_space *mapping,
716                         loff_t pos, unsigned len, unsigned copied,
717                         struct page *page, void *fsdata);
718 extern int afs_writepage(struct page *, struct writeback_control *);
719 extern int afs_writepages(struct address_space *, struct writeback_control *);
720 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
721 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
722 extern int afs_writeback_all(struct afs_vnode *);
723 extern int afs_flush(struct file *, fl_owner_t);
724 extern int afs_fsync(struct file *, loff_t, loff_t, int);
725 
726 
727 /*****************************************************************************/
728 /*
729  * debug tracing
730  */
731 #include <trace/events/afs.h>
732 
733 extern unsigned afs_debug;
734 
735 #define dbgprintk(FMT,...) \
736         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
737 
738 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
739 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
740 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
741 
742 
743 #if defined(__KDEBUG)
744 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
745 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
746 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
747 
748 #elif defined(CONFIG_AFS_DEBUG)
749 #define AFS_DEBUG_KENTER        0x01
750 #define AFS_DEBUG_KLEAVE        0x02
751 #define AFS_DEBUG_KDEBUG        0x04
752 
753 #define _enter(FMT,...)                                 \
754 do {                                                    \
755         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
756                 kenter(FMT,##__VA_ARGS__);              \
757 } while (0)
758 
759 #define _leave(FMT,...)                                 \
760 do {                                                    \
761         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
762                 kleave(FMT,##__VA_ARGS__);              \
763 } while (0)
764 
765 #define _debug(FMT,...)                                 \
766 do {                                                    \
767         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
768                 kdebug(FMT,##__VA_ARGS__);              \
769 } while (0)
770 
771 #else
772 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
773 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
774 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
775 #endif
776 
777 /*
778  * debug assertion checking
779  */
780 #if 1 // defined(__KDEBUGALL)
781 
782 #define ASSERT(X)                                               \
783 do {                                                            \
784         if (unlikely(!(X))) {                                   \
785                 printk(KERN_ERR "\n");                          \
786                 printk(KERN_ERR "AFS: Assertion failed\n");     \
787                 BUG();                                          \
788         }                                                       \
789 } while(0)
790 
791 #define ASSERTCMP(X, OP, Y)                                             \
792 do {                                                                    \
793         if (unlikely(!((X) OP (Y)))) {                                  \
794                 printk(KERN_ERR "\n");                                  \
795                 printk(KERN_ERR "AFS: Assertion failed\n");             \
796                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
797                        (unsigned long)(X), (unsigned long)(Y));         \
798                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
799                        (unsigned long)(X), (unsigned long)(Y));         \
800                 BUG();                                                  \
801         }                                                               \
802 } while(0)
803 
804 #define ASSERTRANGE(L, OP1, N, OP2, H)                                  \
805 do {                                                                    \
806         if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {               \
807                 printk(KERN_ERR "\n");                                  \
808                 printk(KERN_ERR "AFS: Assertion failed\n");             \
809                 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
810                        (unsigned long)(L), (unsigned long)(N),          \
811                        (unsigned long)(H));                             \
812                 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
813                        (unsigned long)(L), (unsigned long)(N),          \
814                        (unsigned long)(H));                             \
815                 BUG();                                                  \
816         }                                                               \
817 } while(0)
818 
819 #define ASSERTIF(C, X)                                          \
820 do {                                                            \
821         if (unlikely((C) && !(X))) {                            \
822                 printk(KERN_ERR "\n");                          \
823                 printk(KERN_ERR "AFS: Assertion failed\n");     \
824                 BUG();                                          \
825         }                                                       \
826 } while(0)
827 
828 #define ASSERTIFCMP(C, X, OP, Y)                                        \
829 do {                                                                    \
830         if (unlikely((C) && !((X) OP (Y)))) {                           \
831                 printk(KERN_ERR "\n");                                  \
832                 printk(KERN_ERR "AFS: Assertion failed\n");             \
833                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
834                        (unsigned long)(X), (unsigned long)(Y));         \
835                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
836                        (unsigned long)(X), (unsigned long)(Y));         \
837                 BUG();                                                  \
838         }                                                               \
839 } while(0)
840 
841 #else
842 
843 #define ASSERT(X)                               \
844 do {                                            \
845 } while(0)
846 
847 #define ASSERTCMP(X, OP, Y)                     \
848 do {                                            \
849 } while(0)
850 
851 #define ASSERTRANGE(L, OP1, N, OP2, H)          \
852 do {                                            \
853 } while(0)
854 
855 #define ASSERTIF(C, X)                          \
856 do {                                            \
857 } while(0)
858 
859 #define ASSERTIFCMP(C, X, OP, Y)                \
860 do {                                            \
861 } while(0)
862 
863 #endif /* __KDEBUGALL */
864 

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