fs/afs/internal.h

   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/fs.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/skbuff.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
  23 #include "afs.h"
  24 #include "afs_vl.h"
  25
  26 #define AFS_CELL_MAX_ADDRS 15
  27
  28 struct pagevec;
  29 struct afs_call;
  30
  31 typedef enum {
  32         AFS_VL_NEW,                     /* new, uninitialised record */
  33         AFS_VL_CREATING,                /* creating record */
  34         AFS_VL_VALID,                   /* record is pending */
  35         AFS_VL_NO_VOLUME,               /* no such volume available */
  36         AFS_VL_UPDATING,                /* update in progress */
  37         AFS_VL_VOLUME_DELETED,          /* volume was deleted */
  38         AFS_VL_UNCERTAIN,               /* uncertain state (update failed) */
  39 } __attribute__((packed)) afs_vlocation_state_t;
  40
  41 struct afs_mount_params {
  42         bool                    rwpath;         /* T if the parent should be considered R/W */
  43         bool                    force;          /* T to force cell type */
  44         afs_voltype_t           type;           /* type of volume requested */
  45         int                     volnamesz;      /* size of volume name */
  46         const char              *volname;       /* name of volume to mount */
  47         struct afs_cell         *cell;          /* cell in which to find volume */
  48         struct afs_volume       *volume;        /* volume record */
  49         struct key              *key;           /* key to use for secure mounting */
  50 };
  51
  52 /*
  53  * definition of how to wait for the completion of an operation
  54  */
  55 struct afs_wait_mode {
  56         /* RxRPC received message notification */
  57         void (*rx_wakeup)(struct afs_call *call);
  58
  59         /* synchronous call waiter and call dispatched notification */
  60         int (*wait)(struct afs_call *call);
  61
  62         /* asynchronous call completion */
  63         void (*async_complete)(void *reply, int error);
  64 };
  65
  66 extern const struct afs_wait_mode afs_sync_call;
  67 extern const struct afs_wait_mode afs_async_call;
  68
  69 /*
  70  * a record of an in-progress RxRPC call
  71  */
  72 struct afs_call {
  73         const struct afs_call_type *type;       /* type of call */
  74         const struct afs_wait_mode *wait_mode;  /* completion wait mode */
  75         wait_queue_head_t       waitq;          /* processes awaiting completion */
  76         struct work_struct      async_work;     /* asynchronous work processor */
  77         struct work_struct      work;           /* actual work processor */
  78         struct sk_buff_head     rx_queue;       /* received packets */
  79         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
  80         struct key              *key;           /* security for this call */
  81         struct afs_server       *server;        /* server affected by incoming CM call */
  82         void                    *request;       /* request data (first part) */
  83         struct address_space    *mapping;       /* page set */
  84         struct afs_writeback    *wb;            /* writeback being performed */
  85         void                    *buffer;        /* reply receive buffer */
  86         void                    *reply;         /* reply buffer (first part) */
  87         void                    *reply2;        /* reply buffer (second part) */
  88         void                    *reply3;        /* reply buffer (third part) */
  89         void                    *reply4;        /* reply buffer (fourth part) */
  90         pgoff_t                 first;          /* first page in mapping to deal with */
  91         pgoff_t                 last;           /* last page in mapping to deal with */
  92         enum {                                  /* call state */
  93                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
  94                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
  95                 AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
  96                 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
  97                 AFS_CALL_REPLYING,      /* replying to incoming call */
  98                 AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
  99                 AFS_CALL_COMPLETE,      /* successfully completed */
 100                 AFS_CALL_BUSY,          /* server was busy */
 101                 AFS_CALL_ABORTED,       /* call was aborted */
 102                 AFS_CALL_ERROR,         /* call failed due to error */
 103         }                       state;
 104         int                     error;          /* error code */
 105         unsigned                request_size;   /* size of request data */
 106         unsigned                reply_max;      /* maximum size of reply */
 107         unsigned                reply_size;     /* current size of reply */
 108         unsigned                first_offset;   /* offset into mapping[first] */
 109         unsigned                last_to;        /* amount of mapping[last] */
 110         unsigned short          offset;         /* offset into received data store */
 111         unsigned char           unmarshall;     /* unmarshalling phase */
 112         bool                    incoming;       /* T if incoming call */
 113         bool                    send_pages;     /* T if data from mapping should be sent */
 114         u16                     service_id;     /* RxRPC service ID to call */
 115         __be16                  port;           /* target UDP port */
 116         __be32                  operation_ID;   /* operation ID for an incoming call */
 117         u32                     count;          /* count for use in unmarshalling */
 118         __be32                  tmp;            /* place to extract temporary data */
 119         afs_dataversion_t       store_version;  /* updated version expected from store */
 120 };
 121
 122 struct afs_call_type {
 123         const char *name;
 124
 125         /* deliver request or reply data to an call
 126          * - returning an error will cause the call to be aborted
 127          */
 128         int (*deliver)(struct afs_call *call, struct sk_buff *skb,
 129                        bool last);
 130
 131         /* map an abort code to an error number */
 132         int (*abort_to_error)(u32 abort_code);
 133
 134         /* clean up a call */
 135         void (*destructor)(struct afs_call *call);
 136 };
 137
 138 /*
 139  * record of an outstanding writeback on a vnode
 140  */
 141 struct afs_writeback {
 142         struct list_head        link;           /* link in vnode->writebacks */
 143         struct work_struct      writer;         /* work item to perform the writeback */
 144         struct afs_vnode        *vnode;         /* vnode to which this write applies */
 145         struct key              *key;           /* owner of this write */
 146         wait_queue_head_t       waitq;          /* completion and ready wait queue */
 147         pgoff_t                 first;          /* first page in batch */
 148         pgoff_t                 point;          /* last page in current store op */
 149         pgoff_t                 last;           /* last page in batch (inclusive) */
 150         unsigned                offset_first;   /* offset into first page of start of write */
 151         unsigned                to_last;        /* offset into last page of end of write */
 152         int                     num_conflicts;  /* count of conflicting writes in list */
 153         int                     usage;
 154         bool                    conflicts;      /* T if has dependent conflicts */
 155         enum {
 156                 AFS_WBACK_SYNCING,              /* synchronisation being performed */
 157                 AFS_WBACK_PENDING,              /* write pending */
 158                 AFS_WBACK_CONFLICTING,          /* conflicting writes posted */
 159                 AFS_WBACK_WRITING,              /* writing back */
 160                 AFS_WBACK_COMPLETE              /* the writeback record has been unlinked */
 161         } state __attribute__((packed));
 162 };
 163
 164 /*
 165  * AFS superblock private data
 166  * - there's one superblock per volume
 167  */
 168 struct afs_super_info {
 169         struct afs_volume       *volume;        /* volume record */
 170         char                    rwparent;       /* T if parent is R/W AFS volume */
 171 };
 172
 173 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 174 {
 175         return sb->s_fs_info;
 176 }
 177
 178 extern struct file_system_type afs_fs_type;
 179
 180 /*
 181  * entry in the cached cell catalogue
 182  */
 183 struct afs_cache_cell {
 184         char            name[AFS_MAXCELLNAME];  /* cell name (padded with NULs) */
 185         struct in_addr  vl_servers[15];         /* cached cell VL servers */
 186 };
 187
 188 /*
 189  * AFS cell record
 190  */
 191 struct afs_cell {
 192         atomic_t                usage;
 193         struct list_head        link;           /* main cell list link */
 194         struct key              *anonymous_key; /* anonymous user key for this cell */
 195         struct list_head        proc_link;      /* /proc cell list link */
 196         struct proc_dir_entry   *proc_dir;      /* /proc dir for this cell */
 197 #ifdef CONFIG_AFS_FSCACHE
 198         struct fscache_cookie   *cache;         /* caching cookie */
 199 #endif
 200
 201         /* server record management */
 202         rwlock_t                servers_lock;   /* active server list lock */
 203         struct list_head        servers;        /* active server list */
 204
 205         /* volume location record management */
 206         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
 207         struct list_head        vl_list;        /* cell's active VL record list */
 208         spinlock_t              vl_lock;        /* vl_list lock */
 209         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
 210         unsigned short          vl_curr_svix;   /* current server index */
 211         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
 212
 213         char                    name[0];        /* cell name - must go last */
 214 };
 215
 216 /*
 217  * entry in the cached volume location catalogue
 218  */
 219 struct afs_cache_vlocation {
 220         /* volume name (lowercase, padded with NULs) */
 221         uint8_t                 name[AFS_MAXVOLNAME + 1];
 222
 223         uint8_t                 nservers;       /* number of entries used in servers[] */
 224         uint8_t                 vidmask;        /* voltype mask for vid[] */
 225         uint8_t                 srvtmask[8];    /* voltype masks for servers[] */
 226 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
 227 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
 228 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
 229
 230         afs_volid_t             vid[3];         /* volume IDs for R/W, R/O and Bak volumes */
 231         struct in_addr          servers[8];     /* fileserver addresses */
 232         time_t                  rtime;          /* last retrieval time */
 233 };
 234
 235 /*
 236  * volume -> vnode hash table entry
 237  */
 238 struct afs_cache_vhash {
 239         afs_voltype_t           vtype;          /* which volume variation */
 240         uint8_t                 hash_bucket;    /* which hash bucket this represents */
 241 } __attribute__((packed));
 242
 243 /*
 244  * AFS volume location record
 245  */
 246 struct afs_vlocation {
 247         atomic_t                usage;
 248         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 249         struct list_head        link;           /* link in cell volume location list */
 250         struct list_head        grave;          /* link in master graveyard list */
 251         struct list_head        update;         /* link in master update list */
 252         struct afs_cell         *cell;          /* cell to which volume belongs */
 253 #ifdef CONFIG_AFS_FSCACHE
 254         struct fscache_cookie   *cache;         /* caching cookie */
 255 #endif
 256         struct afs_cache_vlocation vldb;        /* volume information DB record */
 257         struct afs_volume       *vols[3];       /* volume access record pointer (index by type) */
 258         wait_queue_head_t       waitq;          /* status change waitqueue */
 259         time_t                  update_at;      /* time at which record should be updated */
 260         spinlock_t              lock;           /* access lock */
 261         afs_vlocation_state_t   state;          /* volume location state */
 262         unsigned short          upd_rej_cnt;    /* ENOMEDIUM count during update */
 263         unsigned short          upd_busy_cnt;   /* EBUSY count during update */
 264         bool                    valid;          /* T if valid */
 265 };
 266
 267 /*
 268  * AFS fileserver record
 269  */
 270 struct afs_server {
 271         atomic_t                usage;
 272         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 273         struct in_addr          addr;           /* server address */
 274         struct afs_cell         *cell;          /* cell in which server resides */
 275         struct list_head        link;           /* link in cell's server list */
 276         struct list_head        grave;          /* link in master graveyard list */
 277         struct rb_node          master_rb;      /* link in master by-addr tree */
 278         struct rw_semaphore     sem;            /* access lock */
 279
 280         /* file service access */
 281         struct rb_root          fs_vnodes;      /* vnodes backed by this server (ordered by FID) */
 282         unsigned long           fs_act_jif;     /* time at which last activity occurred */
 283         unsigned long           fs_dead_jif;    /* time at which no longer to be considered dead */
 284         spinlock_t              fs_lock;        /* access lock */
 285         int                     fs_state;       /* 0 or reason FS currently marked dead (-errno) */
 286
 287         /* callback promise management */
 288         struct rb_root          cb_promises;    /* vnode expiration list (ordered earliest first) */
 289         struct delayed_work     cb_updater;     /* callback updater */
 290         struct delayed_work     cb_break_work;  /* collected break dispatcher */
 291         wait_queue_head_t       cb_break_waitq; /* space available in cb_break waitqueue */
 292         spinlock_t              cb_lock;        /* access lock */
 293         struct afs_callback     cb_break[64];   /* ring of callbacks awaiting breaking */
 294         atomic_t                cb_break_n;     /* number of pending breaks */
 295         u8                      cb_break_head;  /* head of callback breaking ring */
 296         u8                      cb_break_tail;  /* tail of callback breaking ring */
 297 };
 298
 299 /*
 300  * AFS volume access record
 301  */
 302 struct afs_volume {
 303         atomic_t                usage;
 304         struct afs_cell         *cell;          /* cell to which belongs (unrefd ptr) */
 305         struct afs_vlocation    *vlocation;     /* volume location */
 306 #ifdef CONFIG_AFS_FSCACHE
 307         struct fscache_cookie   *cache;         /* caching cookie */
 308 #endif
 309         afs_volid_t             vid;            /* volume ID */
 310         afs_voltype_t           type;           /* type of volume */
 311         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
 312         unsigned short          nservers;       /* number of server slots filled */
 313         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
 314         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
 315         struct rw_semaphore     server_sem;     /* lock for accessing current server */
 316 };
 317
 318 /*
 319  * vnode catalogue entry
 320  */
 321 struct afs_cache_vnode {
 322         afs_vnodeid_t           vnode_id;       /* vnode ID */
 323         unsigned                vnode_unique;   /* vnode ID uniquifier */
 324         afs_dataversion_t       data_version;   /* data version */
 325 };
 326
 327 /*
 328  * AFS inode private data
 329  */
 330 struct afs_vnode {
 331         struct inode            vfs_inode;      /* the VFS's inode record */
 332
 333         struct afs_volume       *volume;        /* volume on which vnode resides */
 334         struct afs_server       *server;        /* server currently supplying this file */
 335         struct afs_fid          fid;            /* the file identifier for this inode */
 336         struct afs_file_status  status;         /* AFS status info for this file */
 337 #ifdef CONFIG_AFS_FSCACHE
 338         struct fscache_cookie   *cache;         /* caching cookie */
 339 #endif
 340         struct afs_permits      *permits;       /* cache of permits so far obtained */
 341         struct mutex            permits_lock;   /* lock for altering permits list */
 342         struct mutex            validate_lock;  /* lock for validating this vnode */
 343         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
 344         int                     update_cnt;     /* number of outstanding ops that will update the
 345                                                  * status */
 346         spinlock_t              writeback_lock; /* lock for writebacks */
 347         spinlock_t              lock;           /* waitqueue/flags lock */
 348         unsigned long           flags;
 349 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
 350 #define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
 351 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
 352 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 353 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 354 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
 355 #define AFS_VNODE_LOCKING       6               /* set if waiting for lock on vnode */
 356 #define AFS_VNODE_READLOCKED    7               /* set if vnode is read-locked on the server */
 357 #define AFS_VNODE_WRITELOCKED   8               /* set if vnode is write-locked on the server */
 358 #define AFS_VNODE_UNLOCKING     9               /* set if vnode is being unlocked on the server */
 359
 360         long                    acl_order;      /* ACL check count (callback break count) */
 361
 362         struct list_head        writebacks;     /* alterations in pagecache that need writing */
 363         struct list_head        pending_locks;  /* locks waiting to be granted */
 364         struct list_head        granted_locks;  /* locks granted on this file */
 365         struct delayed_work     lock_work;      /* work to be done in locking */
 366         struct key              *unlock_key;    /* key to be used in unlocking */
 367
 368         /* outstanding callback notification on this file */
 369         struct rb_node          server_rb;      /* link in server->fs_vnodes */
 370         struct rb_node          cb_promise;     /* link in server->cb_promises */
 371         struct work_struct      cb_broken_work; /* work to be done on callback break */
 372         time_t                  cb_expires;     /* time at which callback expires */
 373         time_t                  cb_expires_at;  /* time used to order cb_promise */
 374         unsigned                cb_version;     /* callback version */
 375         unsigned                cb_expiry;      /* callback expiry time */
 376         afs_callback_type_t     cb_type;        /* type of callback */
 377         bool                    cb_promised;    /* true if promise still holds */
 378 };
 379
 380 /*
 381  * cached security record for one user's attempt to access a vnode
 382  */
 383 struct afs_permit {
 384         struct key              *key;           /* RxRPC ticket holding a security context */
 385         afs_access_t            access_mask;    /* access mask for this key */
 386 };
 387
 388 /*
 389  * cache of security records from attempts to access a vnode
 390  */
 391 struct afs_permits {
 392         struct rcu_head         rcu;            /* disposal procedure */
 393         int                     count;          /* number of records */
 394         struct afs_permit       permits[0];     /* the permits so far examined */
 395 };
 396
 397 /*
 398  * record of one of a system's set of network interfaces
 399  */
 400 struct afs_interface {
 401         struct in_addr  address;        /* IPv4 address bound to interface */
 402         struct in_addr  netmask;        /* netmask applied to address */
 403         unsigned        mtu;            /* MTU of interface */
 404 };
 405
 406 /*
 407  * UUID definition [internet draft]
 408  * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
 409  *   increments since midnight 15th October 1582
 410  *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
 411  *     time
 412  * - the clock sequence is a 14-bit counter to avoid duplicate times
 413  */
 414 struct afs_uuid {
 415         u32             time_low;                       /* low part of timestamp */
 416         u16             time_mid;                       /* mid part of timestamp */
 417         u16             time_hi_and_version;            /* high part of timestamp and version  */
 418 #define AFS_UUID_TO_UNIX_TIME   0x01b21dd213814000ULL
 419 #define AFS_UUID_TIMEHI_MASK    0x0fff
 420 #define AFS_UUID_VERSION_TIME   0x1000  /* time-based UUID */
 421 #define AFS_UUID_VERSION_NAME   0x3000  /* name-based UUID */
 422 #define AFS_UUID_VERSION_RANDOM 0x4000  /* (pseudo-)random generated UUID */
 423         u8              clock_seq_hi_and_reserved;      /* clock seq hi and variant */
 424 #define AFS_UUID_CLOCKHI_MASK   0x3f
 425 #define AFS_UUID_VARIANT_STD    0x80
 426         u8              clock_seq_low;                  /* clock seq low */
 427         u8              node[6];                        /* spatially unique node ID (MAC addr) */
 428 };
 429
 430 /*****************************************************************************/
 431 /*
 432  * cache.c
 433  */
 434 #ifdef CONFIG_AFS_FSCACHE
 435 extern struct fscache_netfs afs_cache_netfs;
 436 extern struct fscache_cookie_def afs_cell_cache_index_def;
 437 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
 438 extern struct fscache_cookie_def afs_volume_cache_index_def;
 439 extern struct fscache_cookie_def afs_vnode_cache_index_def;
 440 #else
 441 #define afs_cell_cache_index_def        (*(struct fscache_cookie_def *) NULL)
 442 #define afs_vlocation_cache_index_def   (*(struct fscache_cookie_def *) NULL)
 443 #define afs_volume_cache_index_def      (*(struct fscache_cookie_def *) NULL)
 444 #define afs_vnode_cache_index_def       (*(struct fscache_cookie_def *) NULL)
 445 #endif
 446
 447 /*
 448  * callback.c
 449  */
 450 extern void afs_init_callback_state(struct afs_server *);
 451 extern void afs_broken_callback_work(struct work_struct *);
 452 extern void afs_break_callbacks(struct afs_server *, size_t,
 453                                 struct afs_callback[]);
 454 extern void afs_discard_callback_on_delete(struct afs_vnode *);
 455 extern void afs_give_up_callback(struct afs_vnode *);
 456 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 457 extern void afs_flush_callback_breaks(struct afs_server *);
 458 extern int __init afs_callback_update_init(void);
 459 extern void afs_callback_update_kill(void);
 460
 461 /*
 462  * cell.c
 463  */
 464 extern struct rw_semaphore afs_proc_cells_sem;
 465 extern struct list_head afs_proc_cells;
 466
 467 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
 468 extern int afs_cell_init(char *);
 469 extern struct afs_cell *afs_cell_create(const char *, char *);
 470 extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
 471 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
 472 extern void afs_put_cell(struct afs_cell *);
 473 extern void afs_cell_purge(void);
 474
 475 /*
 476  * cmservice.c
 477  */
 478 extern bool afs_cm_incoming_call(struct afs_call *);
 479
 480 /*
 481  * dir.c
 482  */
 483 extern const struct inode_operations afs_dir_inode_operations;
 484 extern const struct file_operations afs_dir_file_operations;
 485
 486 /*
 487  * file.c
 488  */
 489 extern const struct address_space_operations afs_fs_aops;
 490 extern const struct inode_operations afs_file_inode_operations;
 491 extern const struct file_operations afs_file_operations;
 492
 493 extern int afs_open(struct inode *, struct file *);
 494 extern int afs_release(struct inode *, struct file *);
 495
 496 /*
 497  * flock.c
 498  */
 499 extern void __exit afs_kill_lock_manager(void);
 500 extern void afs_lock_work(struct work_struct *);
 501 extern void afs_lock_may_be_available(struct afs_vnode *);
 502 extern int afs_lock(struct file *, int, struct file_lock *);
 503 extern int afs_flock(struct file *, int, struct file_lock *);
 504
 505 /*
 506  * fsclient.c
 507  */
 508 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
 509                                     struct afs_vnode *, struct afs_volsync *,
 510                                     const struct afs_wait_mode *);
 511 extern int afs_fs_give_up_callbacks(struct afs_server *,
 512                                     const struct afs_wait_mode *);
 513 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
 514                              struct afs_vnode *, off_t, size_t, struct page *,
 515                              const struct afs_wait_mode *);
 516 extern int afs_fs_create(struct afs_server *, struct key *,
 517                          struct afs_vnode *, const char *, umode_t,
 518                          struct afs_fid *, struct afs_file_status *,
 519                          struct afs_callback *,
 520                          const struct afs_wait_mode *);
 521 extern int afs_fs_remove(struct afs_server *, struct key *,
 522                          struct afs_vnode *, const char *, bool,
 523                          const struct afs_wait_mode *);
 524 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
 525                        struct afs_vnode *, const char *,
 526                        const struct afs_wait_mode *);
 527 extern int afs_fs_symlink(struct afs_server *, struct key *,
 528                           struct afs_vnode *, const char *, const char *,
 529                           struct afs_fid *, struct afs_file_status *,
 530                           const struct afs_wait_mode *);
 531 extern int afs_fs_rename(struct afs_server *, struct key *,
 532                          struct afs_vnode *, const char *,
 533                          struct afs_vnode *, const char *,
 534                          const struct afs_wait_mode *);
 535 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
 536                              pgoff_t, pgoff_t, unsigned, unsigned,
 537                              const struct afs_wait_mode *);
 538 extern int afs_fs_setattr(struct afs_server *, struct key *,
 539                           struct afs_vnode *, struct iattr *,
 540                           const struct afs_wait_mode *);
 541 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
 542                                     struct afs_vnode *,
 543                                     struct afs_volume_status *,
 544                                     const struct afs_wait_mode *);
 545 extern int afs_fs_set_lock(struct afs_server *, struct key *,
 546                            struct afs_vnode *, afs_lock_type_t,
 547                            const struct afs_wait_mode *);
 548 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
 549                               struct afs_vnode *,
 550                               const struct afs_wait_mode *);
 551 extern int afs_fs_release_lock(struct afs_server *, struct key *,
 552                                struct afs_vnode *,
 553                                const struct afs_wait_mode *);
 554
 555 /*
 556  * inode.c
 557  */
 558 extern struct inode *afs_iget(struct super_block *, struct key *,
 559                               struct afs_fid *, struct afs_file_status *,
 560                               struct afs_callback *);
 561 extern void afs_zap_data(struct afs_vnode *);
 562 extern int afs_validate(struct afs_vnode *, struct key *);
 563 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 564 extern int afs_setattr(struct dentry *, struct iattr *);
 565 extern void afs_clear_inode(struct inode *);
 566
 567 /*
 568  * main.c
 569  */
 570 extern struct afs_uuid afs_uuid;
 571
 572 /*
 573  * misc.c
 574  */
 575 extern int afs_abort_to_error(u32);
 576
 577 /*
 578  * mntpt.c
 579  */
 580 extern const struct inode_operations afs_mntpt_inode_operations;
 581 extern const struct file_operations afs_mntpt_file_operations;
 582
 583 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
 584 extern void afs_mntpt_kill_timer(void);
 585
 586 /*
 587  * proc.c
 588  */
 589 extern int afs_proc_init(void);
 590 extern void afs_proc_cleanup(void);
 591 extern int afs_proc_cell_setup(struct afs_cell *);
 592 extern void afs_proc_cell_remove(struct afs_cell *);
 593
 594 /*
 595  * rxrpc.c
 596  */
 597 extern int afs_open_socket(void);
 598 extern void afs_close_socket(void);
 599 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
 600                          const struct afs_wait_mode *);
 601 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 602                                             size_t, size_t);
 603 extern void afs_flat_call_destructor(struct afs_call *);
 604 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
 605 extern void afs_send_empty_reply(struct afs_call *);
 606 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
 607 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 608                             size_t);
 609
 610 /*
 611  * security.c
 612  */
 613 extern void afs_clear_permits(struct afs_vnode *);
 614 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
 615 extern void afs_zap_permits(struct rcu_head *);
 616 extern struct key *afs_request_key(struct afs_cell *);
 617 extern int afs_permission(struct inode *, int);
 618
 619 /*
 620  * server.c
 621  */
 622 extern spinlock_t afs_server_peer_lock;
 623
 624 #define afs_get_server(S)                                       \
 625 do {                                                            \
 626         _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
 627         atomic_inc(&(S)->usage);                                \
 628 } while(0)
 629
 630 extern struct afs_server *afs_lookup_server(struct afs_cell *,
 631                                             const struct in_addr *);
 632 extern struct afs_server *afs_find_server(const struct in_addr *);
 633 extern void afs_put_server(struct afs_server *);
 634 extern void __exit afs_purge_servers(void);
 635
 636 /*
 637  * super.c
 638  */
 639 extern int afs_fs_init(void);
 640 extern void afs_fs_exit(void);
 641
 642 /*
 643  * use-rtnetlink.c
 644  */
 645 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
 646 extern int afs_get_MAC_address(u8 *, size_t);
 647
 648 /*
 649  * vlclient.c
 650  */
 651 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
 652                                     const char *, struct afs_cache_vlocation *,
 653                                     const struct afs_wait_mode *);
 654 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
 655                                   afs_volid_t, afs_voltype_t,
 656                                   struct afs_cache_vlocation *,
 657                                   const struct afs_wait_mode *);
 658
 659 /*
 660  * vlocation.c
 661  */
 662 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
 663
 664 extern int __init afs_vlocation_update_init(void);
 665 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
 666                                                   struct key *,
 667                                                   const char *, size_t);
 668 extern void afs_put_vlocation(struct afs_vlocation *);
 669 extern void afs_vlocation_purge(void);
 670
 671 /*
 672  * vnode.c
 673  */
 674 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
 675 {
 676         return container_of(inode, struct afs_vnode, vfs_inode);
 677 }
 678
 679 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 680 {
 681         return &vnode->vfs_inode;
 682 }
 683
 684 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
 685                                              struct afs_server *);
 686 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
 687                                   struct key *);
 688 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
 689                                 off_t, size_t, struct page *);
 690 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
 691                             umode_t, struct afs_fid *, struct afs_file_status *,
 692                             struct afs_callback *, struct afs_server **);
 693 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
 694                             bool);
 695 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
 696                           const char *);
 697 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
 698                              const char *, struct afs_fid *,
 699                              struct afs_file_status *, struct afs_server **);
 700 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
 701                             struct key *, const char *, const char *);
 702 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
 703                                 unsigned, unsigned);
 704 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
 705 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
 706                                        struct afs_volume_status *);
 707 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
 708                               afs_lock_type_t);
 709 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
 710 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
 711
 712 /*
 713  * volume.c
 714  */
 715 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
 716
 717 extern void afs_put_volume(struct afs_volume *);
 718 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
 719 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
 720 extern int afs_volume_release_fileserver(struct afs_vnode *,
 721                                          struct afs_server *, int);
 722
 723 /*
 724  * write.c
 725  */
 726 extern int afs_set_page_dirty(struct page *);
 727 extern void afs_put_writeback(struct afs_writeback *);
 728 extern int afs_write_begin(struct file *file, struct address_space *mapping,
 729                         loff_t pos, unsigned len, unsigned flags,
 730                         struct page **pagep, void **fsdata);
 731 extern int afs_write_end(struct file *file, struct address_space *mapping,
 732                         loff_t pos, unsigned len, unsigned copied,
 733                         struct page *page, void *fsdata);
 734 extern int afs_writepage(struct page *, struct writeback_control *);
 735 extern int afs_writepages(struct address_space *, struct writeback_control *);
 736 extern int afs_write_inode(struct inode *, int);
 737 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 738 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
 739                               unsigned long, loff_t);
 740 extern int afs_writeback_all(struct afs_vnode *);
 741 extern int afs_fsync(struct file *, struct dentry *, int);
 742
 743
 744 /*****************************************************************************/
 745 /*
 746  * debug tracing
 747  */
 748 extern unsigned afs_debug;
 749
 750 #define dbgprintk(FMT,...) \
 751         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 752
 753 /* make sure we maintain the format strings, even when debugging is disabled */
 754 static inline __attribute__((format(printf,1,2)))
 755 void _dbprintk(const char *fmt, ...)
 756 {
 757 }
 758
 759 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 760 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 761 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 762
 763
 764 #if defined(__KDEBUG)
 765 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 766 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 767 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 768
 769 #elif defined(CONFIG_AFS_DEBUG)
 770 #define AFS_DEBUG_KENTER        0x01
 771 #define AFS_DEBUG_KLEAVE        0x02
 772 #define AFS_DEBUG_KDEBUG        0x04
 773
 774 #define _enter(FMT,...)                                 \
 775 do {                                                    \
 776         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
 777                 kenter(FMT,##__VA_ARGS__);              \
 778 } while (0)
 779
 780 #define _leave(FMT,...)                                 \
 781 do {                                                    \
 782         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
 783                 kleave(FMT,##__VA_ARGS__);              \
 784 } while (0)
 785
 786 #define _debug(FMT,...)                                 \
 787 do {                                                    \
 788         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
 789                 kdebug(FMT,##__VA_ARGS__);              \
 790 } while (0)
 791
 792 #else
 793 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 794 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 795 #define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
 796 #endif
 797
 798 /*
 799  * debug assertion checking
 800  */
 801 #if 1 // defined(__KDEBUGALL)
 802
 803 #define ASSERT(X)                                               \
 804 do {                                                            \
 805         if (unlikely(!(X))) {                                   \
 806                 printk(KERN_ERR "\n");                          \
 807                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 808                 BUG();                                          \
 809         }                                                       \
 810 } while(0)
 811
 812 #define ASSERTCMP(X, OP, Y)                                             \
 813 do {                                                                    \
 814         if (unlikely(!((X) OP (Y)))) {                                  \
 815                 printk(KERN_ERR "\n");                                  \
 816                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 817                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 818                        (unsigned long)(X), (unsigned long)(Y));         \
 819                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 820                        (unsigned long)(X), (unsigned long)(Y));         \
 821                 BUG();                                                  \
 822         }                                                               \
 823 } while(0)
 824
 825 #define ASSERTRANGE(L, OP1, N, OP2, H)                                  \
 826 do {                                                                    \
 827         if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {               \
 828                 printk(KERN_ERR "\n");                                  \
 829                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 830                 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
 831                        (unsigned long)(L), (unsigned long)(N),          \
 832                        (unsigned long)(H));                             \
 833                 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
 834                        (unsigned long)(L), (unsigned long)(N),          \
 835                        (unsigned long)(H));                             \
 836                 BUG();                                                  \
 837         }                                                               \
 838 } while(0)
 839
 840 #define ASSERTIF(C, X)                                          \
 841 do {                                                            \
 842         if (unlikely((C) && !(X))) {                            \
 843                 printk(KERN_ERR "\n");                          \
 844                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 845                 BUG();                                          \
 846         }                                                       \
 847 } while(0)
 848
 849 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 850 do {                                                                    \
 851         if (unlikely((C) && !((X) OP (Y)))) {                           \
 852                 printk(KERN_ERR "\n");                                  \
 853                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 854                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 855                        (unsigned long)(X), (unsigned long)(Y));         \
 856                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 857                        (unsigned long)(X), (unsigned long)(Y));         \
 858                 BUG();                                                  \
 859         }                                                               \
 860 } while(0)
 861
 862 #else
 863
 864 #define ASSERT(X)                               \
 865 do {                                            \
 866 } while(0)
 867
 868 #define ASSERTCMP(X, OP, Y)                     \
 869 do {                                            \
 870 } while(0)
 871
 872 #define ASSERTRANGE(L, OP1, N, OP2, H)          \
 873 do {                                            \
 874 } while(0)
 875
 876 #define ASSERTIF(C, X)                          \
 877 do {                                            \
 878 } while(0)
 879
 880 #define ASSERTIFCMP(C, X, OP, Y)                \
 881 do {                                            \
 882 } while(0)
 883
 884 #endif /* __KDEBUGALL */