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 #include <linux/backing-dev.h>
  23
  24 #include "afs.h"
  25 #include "afs_vl.h"
  26
  27 #define AFS_CELL_MAX_ADDRS 15
  28
  29 struct pagevec;
  30 struct afs_call;
  31
  32 typedef enum {
  33         AFS_VL_NEW,                     /* new, uninitialised record */
  34         AFS_VL_CREATING,                /* creating record */
  35         AFS_VL_VALID,                   /* record is pending */
  36         AFS_VL_NO_VOLUME,               /* no such volume available */
  37         AFS_VL_UPDATING,                /* update in progress */
  38         AFS_VL_VOLUME_DELETED,          /* volume was deleted */
  39         AFS_VL_UNCERTAIN,               /* uncertain state (update failed) */
  40 } __attribute__((packed)) afs_vlocation_state_t;
  41
  42 struct afs_mount_params {
  43         bool                    rwpath;         /* T if the parent should be considered R/W */
  44         bool                    force;          /* T to force cell type */
  45         bool                    autocell;       /* T if set auto mount operation */
  46         afs_voltype_t           type;           /* type of volume requested */
  47         int                     volnamesz;      /* size of volume name */
  48         const char              *volname;       /* name of volume to mount */
  49         struct afs_cell         *cell;          /* cell in which to find volume */
  50         struct afs_volume       *volume;        /* volume record */
  51         struct key              *key;           /* key to use for secure mounting */
  52 };
  53
  54 /*
  55  * definition of how to wait for the completion of an operation
  56  */
  57 struct afs_wait_mode {
  58         /* RxRPC received message notification */
  59         void (*rx_wakeup)(struct afs_call *call);
  60
  61         /* synchronous call waiter and call dispatched notification */
  62         int (*wait)(struct afs_call *call);
  63
  64         /* asynchronous call completion */
  65         void (*async_complete)(void *reply, int error);
  66 };
  67
  68 extern const struct afs_wait_mode afs_sync_call;
  69 extern const struct afs_wait_mode afs_async_call;
  70
  71 /*
  72  * a record of an in-progress RxRPC call
  73  */
  74 struct afs_call {
  75         const struct afs_call_type *type;       /* type of call */
  76         const struct afs_wait_mode *wait_mode;  /* completion wait mode */
  77         wait_queue_head_t       waitq;          /* processes awaiting completion */
  78         struct work_struct      async_work;     /* asynchronous work processor */
  79         struct work_struct      work;           /* actual work processor */
  80         struct sk_buff_head     rx_queue;       /* received packets */
  81         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
  82         struct key              *key;           /* security for this call */
  83         struct afs_server       *server;        /* server affected by incoming CM call */
  84         void                    *request;       /* request data (first part) */
  85         struct address_space    *mapping;       /* page set */
  86         struct afs_writeback    *wb;            /* writeback being performed */
  87         void                    *buffer;        /* reply receive buffer */
  88         void                    *reply;         /* reply buffer (first part) */
  89         void                    *reply2;        /* reply buffer (second part) */
  90         void                    *reply3;        /* reply buffer (third part) */
  91         void                    *reply4;        /* reply buffer (fourth part) */
  92         pgoff_t                 first;          /* first page in mapping to deal with */
  93         pgoff_t                 last;           /* last page in mapping to deal with */
  94         enum {                                  /* call state */
  95                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
  96                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
  97                 AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
  98                 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
  99                 AFS_CALL_REPLYING,      /* replying to incoming call */
 100                 AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
 101                 AFS_CALL_COMPLETE,      /* successfully completed */
 102                 AFS_CALL_BUSY,          /* server was busy */
 103                 AFS_CALL_ABORTED,       /* call was aborted */
 104                 AFS_CALL_ERROR,         /* call failed due to error */
 105         }                       state;
 106         int                     error;          /* error code */
 107         unsigned                request_size;   /* size of request data */
 108         unsigned                reply_max;      /* maximum size of reply */
 109         unsigned                reply_size;     /* current size of reply */
 110         unsigned                first_offset;   /* offset into mapping[first] */
 111         unsigned                last_to;        /* amount of mapping[last] */
 112         unsigned                offset;         /* offset into received data store */
 113         unsigned char           unmarshall;     /* unmarshalling phase */
 114         bool                    incoming;       /* T if incoming call */
 115         bool                    send_pages;     /* T if data from mapping should be sent */
 116         u16                     service_id;     /* RxRPC service ID to call */
 117         __be16                  port;           /* target UDP port */
 118         __be32                  operation_ID;   /* operation ID for an incoming call */
 119         u32                     count;          /* count for use in unmarshalling */
 120         __be32                  tmp;            /* place to extract temporary data */
 121         afs_dataversion_t       store_version;  /* updated version expected from store */
 122 };
 123
 124 struct afs_call_type {
 125         const char *name;
 126
 127         /* deliver request or reply data to an call
 128          * - returning an error will cause the call to be aborted
 129          */
 130         int (*deliver)(struct afs_call *call, struct sk_buff *skb,
 131                        bool last);
 132
 133         /* map an abort code to an error number */
 134         int (*abort_to_error)(u32 abort_code);
 135
 136         /* clean up a call */
 137         void (*destructor)(struct afs_call *call);
 138 };
 139
 140 /*
 141  * record of an outstanding writeback on a vnode
 142  */
 143 struct afs_writeback {
 144         struct list_head        link;           /* link in vnode->writebacks */
 145         struct work_struct      writer;         /* work item to perform the writeback */
 146         struct afs_vnode        *vnode;         /* vnode to which this write applies */
 147         struct key              *key;           /* owner of this write */
 148         wait_queue_head_t       waitq;          /* completion and ready wait queue */
 149         pgoff_t                 first;          /* first page in batch */
 150         pgoff_t                 point;          /* last page in current store op */
 151         pgoff_t                 last;           /* last page in batch (inclusive) */
 152         unsigned                offset_first;   /* offset into first page of start of write */
 153         unsigned                to_last;        /* offset into last page of end of write */
 154         int                     num_conflicts;  /* count of conflicting writes in list */
 155         int                     usage;
 156         bool                    conflicts;      /* T if has dependent conflicts */
 157         enum {
 158                 AFS_WBACK_SYNCING,              /* synchronisation being performed */
 159                 AFS_WBACK_PENDING,              /* write pending */
 160                 AFS_WBACK_CONFLICTING,          /* conflicting writes posted */
 161                 AFS_WBACK_WRITING,              /* writing back */
 162                 AFS_WBACK_COMPLETE              /* the writeback record has been unlinked */
 163         } state __attribute__((packed));
 164 };
 165
 166 /*
 167  * AFS superblock private data
 168  * - there's one superblock per volume
 169  */
 170 struct afs_super_info {
 171         struct afs_volume       *volume;        /* volume record */
 172         char                    rwparent;       /* T if parent is R/W AFS volume */
 173 };
 174
 175 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 176 {
 177         return sb->s_fs_info;
 178 }
 179
 180 extern struct file_system_type afs_fs_type;
 181
 182 /*
 183  * entry in the cached cell catalogue
 184  */
 185 struct afs_cache_cell {
 186         char            name[AFS_MAXCELLNAME];  /* cell name (padded with NULs) */
 187         struct in_addr  vl_servers[15];         /* cached cell VL servers */
 188 };
 189
 190 /*
 191  * AFS cell record
 192  */
 193 struct afs_cell {
 194         atomic_t                usage;
 195         struct list_head        link;           /* main cell list link */
 196         struct key              *anonymous_key; /* anonymous user key for this cell */
 197         struct list_head        proc_link;      /* /proc cell list link */
 198 #ifdef CONFIG_AFS_FSCACHE
 199         struct fscache_cookie   *cache;         /* caching cookie */
 200 #endif
 201
 202         /* server record management */
 203         rwlock_t                servers_lock;   /* active server list lock */
 204         struct list_head        servers;        /* active server list */
 205
 206         /* volume location record management */
 207         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
 208         struct list_head        vl_list;        /* cell's active VL record list */
 209         spinlock_t              vl_lock;        /* vl_list lock */
 210         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
 211         unsigned short          vl_curr_svix;   /* current server index */
 212         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
 213
 214         char                    name[0];        /* cell name - must go last */
 215 };
 216
 217 /*
 218  * entry in the cached volume location catalogue
 219  */
 220 struct afs_cache_vlocation {
 221         /* volume name (lowercase, padded with NULs) */
 222         uint8_t                 name[AFS_MAXVOLNAME + 1];
 223
 224         uint8_t                 nservers;       /* number of entries used in servers[] */
 225         uint8_t                 vidmask;        /* voltype mask for vid[] */
 226         uint8_t                 srvtmask[8];    /* voltype masks for servers[] */
 227 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
 228 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
 229 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
 230
 231         afs_volid_t             vid[3];         /* volume IDs for R/W, R/O and Bak volumes */
 232         struct in_addr          servers[8];     /* fileserver addresses */
 233         time_t                  rtime;          /* last retrieval time */
 234 };
 235
 236 /*
 237  * volume -> vnode hash table entry
 238  */
 239 struct afs_cache_vhash {
 240         afs_voltype_t           vtype;          /* which volume variation */
 241         uint8_t                 hash_bucket;    /* which hash bucket this represents */
 242 } __attribute__((packed));
 243
 244 /*
 245  * AFS volume location record
 246  */
 247 struct afs_vlocation {
 248         atomic_t                usage;
 249         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 250         struct list_head        link;           /* link in cell volume location list */
 251         struct list_head        grave;          /* link in master graveyard list */
 252         struct list_head        update;         /* link in master update list */
 253         struct afs_cell         *cell;          /* cell to which volume belongs */
 254 #ifdef CONFIG_AFS_FSCACHE
 255         struct fscache_cookie   *cache;         /* caching cookie */
 256 #endif
 257         struct afs_cache_vlocation vldb;        /* volume information DB record */
 258         struct afs_volume       *vols[3];       /* volume access record pointer (index by type) */
 259         wait_queue_head_t       waitq;          /* status change waitqueue */
 260         time_t                  update_at;      /* time at which record should be updated */
 261         spinlock_t              lock;           /* access lock */
 262         afs_vlocation_state_t   state;          /* volume location state */
 263         unsigned short          upd_rej_cnt;    /* ENOMEDIUM count during update */
 264         unsigned short          upd_busy_cnt;   /* EBUSY count during update */
 265         bool                    valid;          /* T if valid */
 266 };
 267
 268 /*
 269  * AFS fileserver record
 270  */
 271 struct afs_server {
 272         atomic_t                usage;
 273         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 274         struct in_addr          addr;           /* server address */
 275         struct afs_cell         *cell;          /* cell in which server resides */
 276         struct list_head        link;           /* link in cell's server list */
 277         struct list_head        grave;          /* link in master graveyard list */
 278         struct rb_node          master_rb;      /* link in master by-addr tree */
 279         struct rw_semaphore     sem;            /* access lock */
 280
 281         /* file service access */
 282         struct rb_root          fs_vnodes;      /* vnodes backed by this server (ordered by FID) */
 283         unsigned long           fs_act_jif;     /* time at which last activity occurred */
 284         unsigned long           fs_dead_jif;    /* time at which no longer to be considered dead */
 285         spinlock_t              fs_lock;        /* access lock */
 286         int                     fs_state;       /* 0 or reason FS currently marked dead (-errno) */
 287
 288         /* callback promise management */
 289         struct rb_root          cb_promises;    /* vnode expiration list (ordered earliest first) */
 290         struct delayed_work     cb_updater;     /* callback updater */
 291         struct delayed_work     cb_break_work;  /* collected break dispatcher */
 292         wait_queue_head_t       cb_break_waitq; /* space available in cb_break waitqueue */
 293         spinlock_t              cb_lock;        /* access lock */
 294         struct afs_callback     cb_break[64];   /* ring of callbacks awaiting breaking */
 295         atomic_t                cb_break_n;     /* number of pending breaks */
 296         u8                      cb_break_head;  /* head of callback breaking ring */
 297         u8                      cb_break_tail;  /* tail of callback breaking ring */
 298 };
 299
 300 /*
 301  * AFS volume access record
 302  */
 303 struct afs_volume {
 304         atomic_t                usage;
 305         struct afs_cell         *cell;          /* cell to which belongs (unrefd ptr) */
 306         struct afs_vlocation    *vlocation;     /* volume location */
 307 #ifdef CONFIG_AFS_FSCACHE
 308         struct fscache_cookie   *cache;         /* caching cookie */
 309 #endif
 310         afs_volid_t             vid;            /* volume ID */
 311         afs_voltype_t           type;           /* type of volume */
 312         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
 313         unsigned short          nservers;       /* number of server slots filled */
 314         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
 315         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
 316         struct rw_semaphore     server_sem;     /* lock for accessing current server */
 317         struct backing_dev_info bdi;
 318 };
 319
 320 /*
 321  * vnode catalogue entry
 322  */
 323 struct afs_cache_vnode {
 324         afs_vnodeid_t           vnode_id;       /* vnode ID */
 325         unsigned                vnode_unique;   /* vnode ID uniquifier */
 326         afs_dataversion_t       data_version;   /* data version */
 327 };
 328
 329 /*
 330  * AFS inode private data
 331  */
 332 struct afs_vnode {
 333         struct inode            vfs_inode;      /* the VFS's inode record */
 334
 335         struct afs_volume       *volume;        /* volume on which vnode resides */
 336         struct afs_server       *server;        /* server currently supplying this file */
 337         struct afs_fid          fid;            /* the file identifier for this inode */
 338         struct afs_file_status  status;         /* AFS status info for this file */
 339 #ifdef CONFIG_AFS_FSCACHE
 340         struct fscache_cookie   *cache;         /* caching cookie */
 341 #endif
 342         struct afs_permits      *permits;       /* cache of permits so far obtained */
 343         struct mutex            permits_lock;   /* lock for altering permits list */
 344         struct mutex            validate_lock;  /* lock for validating this vnode */
 345         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
 346         int                     update_cnt;     /* number of outstanding ops that will update the
 347                                                  * status */
 348         spinlock_t              writeback_lock; /* lock for writebacks */
 349         spinlock_t              lock;           /* waitqueue/flags lock */
 350         unsigned long           flags;
 351 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
 352 #define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
 353 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
 354 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 355 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 356 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
 357 #define AFS_VNODE_LOCKING       6               /* set if waiting for lock on vnode */
 358 #define AFS_VNODE_READLOCKED    7               /* set if vnode is read-locked on the server */
 359 #define AFS_VNODE_WRITELOCKED   8               /* set if vnode is write-locked on the server */
 360 #define AFS_VNODE_UNLOCKING     9               /* set if vnode is being unlocked on the server */
 361 #define AFS_VNODE_AUTOCELL      10              /* set if Vnode is an auto mount point */
 362 #define AFS_VNODE_PSEUDODIR     11              /* set if Vnode is a pseudo directory */
 363
 364         long                    acl_order;      /* ACL check count (callback break count) */
 365
 366         struct list_head        writebacks;     /* alterations in pagecache that need writing */
 367         struct list_head        pending_locks;  /* locks waiting to be granted */
 368         struct list_head        granted_locks;  /* locks granted on this file */
 369         struct delayed_work     lock_work;      /* work to be done in locking */
 370         struct key              *unlock_key;    /* key to be used in unlocking */
 371
 372         /* outstanding callback notification on this file */
 373         struct rb_node          server_rb;      /* link in server->fs_vnodes */
 374         struct rb_node          cb_promise;     /* link in server->cb_promises */
 375         struct work_struct      cb_broken_work; /* work to be done on callback break */
 376         time_t                  cb_expires;     /* time at which callback expires */
 377         time_t                  cb_expires_at;  /* time used to order cb_promise */
 378         unsigned                cb_version;     /* callback version */
 379         unsigned                cb_expiry;      /* callback expiry time */
 380         afs_callback_type_t     cb_type;        /* type of callback */
 381         bool                    cb_promised;    /* true if promise still holds */
 382 };
 383
 384 /*
 385  * cached security record for one user's attempt to access a vnode
 386  */
 387 struct afs_permit {
 388         struct key              *key;           /* RxRPC ticket holding a security context */
 389         afs_access_t            access_mask;    /* access mask for this key */
 390 };
 391
 392 /*
 393  * cache of security records from attempts to access a vnode
 394  */
 395 struct afs_permits {
 396         struct rcu_head         rcu;            /* disposal procedure */
 397         int                     count;          /* number of records */
 398         struct afs_permit       permits[0];     /* the permits so far examined */
 399 };
 400
 401 /*
 402  * record of one of a system's set of network interfaces
 403  */
 404 struct afs_interface {
 405         struct in_addr  address;        /* IPv4 address bound to interface */
 406         struct in_addr  netmask;        /* netmask applied to address */
 407         unsigned        mtu;            /* MTU of interface */
 408 };
 409
 410 /*
 411  * UUID definition [internet draft]
 412  * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
 413  *   increments since midnight 15th October 1582
 414  *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
 415  *     time
 416  * - the clock sequence is a 14-bit counter to avoid duplicate times
 417  */
 418 struct afs_uuid {
 419         u32             time_low;                       /* low part of timestamp */
 420         u16             time_mid;                       /* mid part of timestamp */
 421         u16             time_hi_and_version;            /* high part of timestamp and version  */
 422 #define AFS_UUID_TO_UNIX_TIME   0x01b21dd213814000ULL
 423 #define AFS_UUID_TIMEHI_MASK    0x0fff
 424 #define AFS_UUID_VERSION_TIME   0x1000  /* time-based UUID */
 425 #define AFS_UUID_VERSION_NAME   0x3000  /* name-based UUID */
 426 #define AFS_UUID_VERSION_RANDOM 0x4000  /* (pseudo-)random generated UUID */
 427         u8              clock_seq_hi_and_reserved;      /* clock seq hi and variant */
 428 #define AFS_UUID_CLOCKHI_MASK   0x3f
 429 #define AFS_UUID_VARIANT_STD    0x80
 430         u8              clock_seq_low;                  /* clock seq low */
 431         u8              node[6];                        /* spatially unique node ID (MAC addr) */
 432 };
 433
 434 /*****************************************************************************/
 435 /*
 436  * cache.c
 437  */
 438 #ifdef CONFIG_AFS_FSCACHE
 439 extern struct fscache_netfs afs_cache_netfs;
 440 extern struct fscache_cookie_def afs_cell_cache_index_def;
 441 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
 442 extern struct fscache_cookie_def afs_volume_cache_index_def;
 443 extern struct fscache_cookie_def afs_vnode_cache_index_def;
 444 #else
 445 #define afs_cell_cache_index_def        (*(struct fscache_cookie_def *) NULL)
 446 #define afs_vlocation_cache_index_def   (*(struct fscache_cookie_def *) NULL)
 447 #define afs_volume_cache_index_def      (*(struct fscache_cookie_def *) NULL)
 448 #define afs_vnode_cache_index_def       (*(struct fscache_cookie_def *) NULL)
 449 #endif
 450
 451 /*
 452  * callback.c
 453  */
 454 extern void afs_init_callback_state(struct afs_server *);
 455 extern void afs_broken_callback_work(struct work_struct *);
 456 extern void afs_break_callbacks(struct afs_server *, size_t,
 457                                 struct afs_callback[]);
 458 extern void afs_discard_callback_on_delete(struct afs_vnode *);
 459 extern void afs_give_up_callback(struct afs_vnode *);
 460 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 461 extern void afs_flush_callback_breaks(struct afs_server *);
 462 extern int __init afs_callback_update_init(void);
 463 extern void afs_callback_update_kill(void);
 464
 465 /*
 466  * cell.c
 467  */
 468 extern struct rw_semaphore afs_proc_cells_sem;
 469 extern struct list_head afs_proc_cells;
 470
 471 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
 472 extern int afs_cell_init(char *);
 473 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool);
 474 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool);
 475 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
 476 extern void afs_put_cell(struct afs_cell *);
 477 extern void afs_cell_purge(void);
 478
 479 /*
 480  * cmservice.c
 481  */
 482 extern bool afs_cm_incoming_call(struct afs_call *);
 483
 484 /*
 485  * dir.c
 486  */
 487 extern const struct inode_operations afs_dir_inode_operations;
 488 extern const struct dentry_operations afs_fs_dentry_operations;
 489 extern const struct file_operations afs_dir_file_operations;
 490
 491 /*
 492  * file.c
 493  */
 494 extern const struct address_space_operations afs_fs_aops;
 495 extern const struct inode_operations afs_file_inode_operations;
 496 extern const struct file_operations afs_file_operations;
 497
 498 extern int afs_open(struct inode *, struct file *);
 499 extern int afs_release(struct inode *, struct file *);
 500 extern int afs_page_filler(void *, struct page *);
 501
 502 /*
 503  * flock.c
 504  */
 505 extern void __exit afs_kill_lock_manager(void);
 506 extern void afs_lock_work(struct work_struct *);
 507 extern void afs_lock_may_be_available(struct afs_vnode *);
 508 extern int afs_lock(struct file *, int, struct file_lock *);
 509 extern int afs_flock(struct file *, int, struct file_lock *);
 510
 511 /*
 512  * fsclient.c
 513  */
 514 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
 515                                     struct afs_vnode *, struct afs_volsync *,
 516                                     const struct afs_wait_mode *);
 517 extern int afs_fs_give_up_callbacks(struct afs_server *,
 518                                     const struct afs_wait_mode *);
 519 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
 520                              struct afs_vnode *, off_t, size_t, struct page *,
 521                              const struct afs_wait_mode *);
 522 extern int afs_fs_create(struct afs_server *, struct key *,
 523                          struct afs_vnode *, const char *, umode_t,
 524                          struct afs_fid *, struct afs_file_status *,
 525                          struct afs_callback *,
 526                          const struct afs_wait_mode *);
 527 extern int afs_fs_remove(struct afs_server *, struct key *,
 528                          struct afs_vnode *, const char *, bool,
 529                          const struct afs_wait_mode *);
 530 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
 531                        struct afs_vnode *, const char *,
 532                        const struct afs_wait_mode *);
 533 extern int afs_fs_symlink(struct afs_server *, struct key *,
 534                           struct afs_vnode *, const char *, const char *,
 535                           struct afs_fid *, struct afs_file_status *,
 536                           const struct afs_wait_mode *);
 537 extern int afs_fs_rename(struct afs_server *, struct key *,
 538                          struct afs_vnode *, const char *,
 539                          struct afs_vnode *, const char *,
 540                          const struct afs_wait_mode *);
 541 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
 542                              pgoff_t, pgoff_t, unsigned, unsigned,
 543                              const struct afs_wait_mode *);
 544 extern int afs_fs_setattr(struct afs_server *, struct key *,
 545                           struct afs_vnode *, struct iattr *,
 546                           const struct afs_wait_mode *);
 547 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
 548                                     struct afs_vnode *,
 549                                     struct afs_volume_status *,
 550                                     const struct afs_wait_mode *);
 551 extern int afs_fs_set_lock(struct afs_server *, struct key *,
 552                            struct afs_vnode *, afs_lock_type_t,
 553                            const struct afs_wait_mode *);
 554 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
 555                               struct afs_vnode *,
 556                               const struct afs_wait_mode *);
 557 extern int afs_fs_release_lock(struct afs_server *, struct key *,
 558                                struct afs_vnode *,
 559                                const struct afs_wait_mode *);
 560
 561 /*
 562  * inode.c
 563  */
 564 extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
 565                                        struct key *);
 566 extern struct inode *afs_iget(struct super_block *, struct key *,
 567                               struct afs_fid *, struct afs_file_status *,
 568                               struct afs_callback *);
 569 extern void afs_zap_data(struct afs_vnode *);
 570 extern int afs_validate(struct afs_vnode *, struct key *);
 571 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 572 extern int afs_setattr(struct dentry *, struct iattr *);
 573 extern void afs_evict_inode(struct inode *);
 574 extern int afs_drop_inode(struct inode *);
 575
 576 /*
 577  * main.c
 578  */
 579 extern struct workqueue_struct *afs_wq;
 580 extern struct afs_uuid afs_uuid;
 581
 582 /*
 583  * misc.c
 584  */
 585 extern int afs_abort_to_error(u32);
 586
 587 /*
 588  * mntpt.c
 589  */
 590 extern const struct inode_operations afs_mntpt_inode_operations;
 591 extern const struct inode_operations afs_autocell_inode_operations;
 592 extern const struct file_operations afs_mntpt_file_operations;
 593
 594 extern struct vfsmount *afs_d_automount(struct path *);
 595 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
 596 extern void afs_mntpt_kill_timer(void);
 597
 598 /*
 599  * proc.c
 600  */
 601 extern int afs_proc_init(void);
 602 extern void afs_proc_cleanup(void);
 603 extern int afs_proc_cell_setup(struct afs_cell *);
 604 extern void afs_proc_cell_remove(struct afs_cell *);
 605
 606 /*
 607  * rxrpc.c
 608  */
 609 extern int afs_open_socket(void);
 610 extern void afs_close_socket(void);
 611 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
 612                          const struct afs_wait_mode *);
 613 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 614                                             size_t, size_t);
 615 extern void afs_flat_call_destructor(struct afs_call *);
 616 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
 617 extern void afs_send_empty_reply(struct afs_call *);
 618 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
 619 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 620                             size_t);
 621
 622 /*
 623  * security.c
 624  */
 625 extern void afs_clear_permits(struct afs_vnode *);
 626 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
 627 extern void afs_zap_permits(struct rcu_head *);
 628 extern struct key *afs_request_key(struct afs_cell *);
 629 extern int afs_permission(struct inode *, int);
 630
 631 /*
 632  * server.c
 633  */
 634 extern spinlock_t afs_server_peer_lock;
 635
 636 #define afs_get_server(S)                                       \
 637 do {                                                            \
 638         _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
 639         atomic_inc(&(S)->usage);                                \
 640 } while(0)
 641
 642 extern struct afs_server *afs_lookup_server(struct afs_cell *,
 643                                             const struct in_addr *);
 644 extern struct afs_server *afs_find_server(const struct in_addr *);
 645 extern void afs_put_server(struct afs_server *);
 646 extern void __exit afs_purge_servers(void);
 647
 648 /*
 649  * super.c
 650  */
 651 extern int afs_fs_init(void);
 652 extern void afs_fs_exit(void);
 653
 654 /*
 655  * use-rtnetlink.c
 656  */
 657 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
 658 extern int afs_get_MAC_address(u8 *, size_t);
 659
 660 /*
 661  * vlclient.c
 662  */
 663 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
 664                                     const char *, struct afs_cache_vlocation *,
 665                                     const struct afs_wait_mode *);
 666 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
 667                                   afs_volid_t, afs_voltype_t,
 668                                   struct afs_cache_vlocation *,
 669                                   const struct afs_wait_mode *);
 670
 671 /*
 672  * vlocation.c
 673  */
 674 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
 675
 676 extern int __init afs_vlocation_update_init(void);
 677 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
 678                                                   struct key *,
 679                                                   const char *, size_t);
 680 extern void afs_put_vlocation(struct afs_vlocation *);
 681 extern void afs_vlocation_purge(void);
 682
 683 /*
 684  * vnode.c
 685  */
 686 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
 687 {
 688         return container_of(inode, struct afs_vnode, vfs_inode);
 689 }
 690
 691 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 692 {
 693         return &vnode->vfs_inode;
 694 }
 695
 696 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
 697                                              struct afs_server *);
 698 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
 699                                   struct key *);
 700 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
 701                                 off_t, size_t, struct page *);
 702 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
 703                             umode_t, struct afs_fid *, struct afs_file_status *,
 704                             struct afs_callback *, struct afs_server **);
 705 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
 706                             bool);
 707 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
 708                           const char *);
 709 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
 710                              const char *, struct afs_fid *,
 711                              struct afs_file_status *, struct afs_server **);
 712 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
 713                             struct key *, const char *, const char *);
 714 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
 715                                 unsigned, unsigned);
 716 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
 717 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
 718                                        struct afs_volume_status *);
 719 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
 720                               afs_lock_type_t);
 721 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
 722 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
 723
 724 /*
 725  * volume.c
 726  */
 727 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
 728
 729 extern void afs_put_volume(struct afs_volume *);
 730 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
 731 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
 732 extern int afs_volume_release_fileserver(struct afs_vnode *,
 733                                          struct afs_server *, int);
 734
 735 /*
 736  * write.c
 737  */
 738 extern int afs_set_page_dirty(struct page *);
 739 extern void afs_put_writeback(struct afs_writeback *);
 740 extern int afs_write_begin(struct file *file, struct address_space *mapping,
 741                         loff_t pos, unsigned len, unsigned flags,
 742                         struct page **pagep, void **fsdata);
 743 extern int afs_write_end(struct file *file, struct address_space *mapping,
 744                         loff_t pos, unsigned len, unsigned copied,
 745                         struct page *page, void *fsdata);
 746 extern int afs_writepage(struct page *, struct writeback_control *);
 747 extern int afs_writepages(struct address_space *, struct writeback_control *);
 748 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 749 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
 750                               unsigned long, loff_t);
 751 extern int afs_writeback_all(struct afs_vnode *);
 752 extern int afs_fsync(struct file *, loff_t, loff_t, int);
 753
 754
 755 /*****************************************************************************/
 756 /*
 757  * debug tracing
 758  */
 759 extern unsigned afs_debug;
 760
 761 #define dbgprintk(FMT,...) \
 762         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 763
 764 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 765 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 766 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 767
 768
 769 #if defined(__KDEBUG)
 770 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 771 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 772 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 773
 774 #elif defined(CONFIG_AFS_DEBUG)
 775 #define AFS_DEBUG_KENTER        0x01
 776 #define AFS_DEBUG_KLEAVE        0x02
 777 #define AFS_DEBUG_KDEBUG        0x04
 778
 779 #define _enter(FMT,...)                                 \
 780 do {                                                    \
 781         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
 782                 kenter(FMT,##__VA_ARGS__);              \
 783 } while (0)
 784
 785 #define _leave(FMT,...)                                 \
 786 do {                                                    \
 787         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
 788                 kleave(FMT,##__VA_ARGS__);              \
 789 } while (0)
 790
 791 #define _debug(FMT,...)                                 \
 792 do {                                                    \
 793         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
 794                 kdebug(FMT,##__VA_ARGS__);              \
 795 } while (0)
 796
 797 #else
 798 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 799 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 800 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 801 #endif
 802
 803 /*
 804  * debug assertion checking
 805  */
 806 #if 1 // defined(__KDEBUGALL)
 807
 808 #define ASSERT(X)                                               \
 809 do {                                                            \
 810         if (unlikely(!(X))) {                                   \
 811                 printk(KERN_ERR "\n");                          \
 812                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 813                 BUG();                                          \
 814         }                                                       \
 815 } while(0)
 816
 817 #define ASSERTCMP(X, OP, Y)                                             \
 818 do {                                                                    \
 819         if (unlikely(!((X) OP (Y)))) {                                  \
 820                 printk(KERN_ERR "\n");                                  \
 821                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 822                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 823                        (unsigned long)(X), (unsigned long)(Y));         \
 824                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 825                        (unsigned long)(X), (unsigned long)(Y));         \
 826                 BUG();                                                  \
 827         }                                                               \
 828 } while(0)
 829
 830 #define ASSERTRANGE(L, OP1, N, OP2, H)                                  \
 831 do {                                                                    \
 832         if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {               \
 833                 printk(KERN_ERR "\n");                                  \
 834                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 835                 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
 836                        (unsigned long)(L), (unsigned long)(N),          \
 837                        (unsigned long)(H));                             \
 838                 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
 839                        (unsigned long)(L), (unsigned long)(N),          \
 840                        (unsigned long)(H));                             \
 841                 BUG();                                                  \
 842         }                                                               \
 843 } while(0)
 844
 845 #define ASSERTIF(C, X)                                          \
 846 do {                                                            \
 847         if (unlikely((C) && !(X))) {                            \
 848                 printk(KERN_ERR "\n");                          \
 849                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 850                 BUG();                                          \
 851         }                                                       \
 852 } while(0)
 853
 854 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 855 do {                                                                    \
 856         if (unlikely((C) && !((X) OP (Y)))) {                           \
 857                 printk(KERN_ERR "\n");                                  \
 858                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 859                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 860                        (unsigned long)(X), (unsigned long)(Y));         \
 861                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 862                        (unsigned long)(X), (unsigned long)(Y));         \
 863                 BUG();                                                  \
 864         }                                                               \
 865 } while(0)
 866
 867 #else
 868
 869 #define ASSERT(X)                               \
 870 do {                                            \
 871 } while(0)
 872
 873 #define ASSERTCMP(X, OP, Y)                     \
 874 do {                                            \
 875 } while(0)
 876
 877 #define ASSERTRANGE(L, OP1, N, OP2, H)          \
 878 do {                                            \
 879 } while(0)
 880
 881 #define ASSERTIF(C, X)                          \
 882 do {                                            \
 883 } while(0)
 884
 885 #define ASSERTIFCMP(C, X, OP, Y)                \
 886 do {                                            \
 887 } while(0)
 888
 889 #endif /* __KDEBUGALL */