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         afs_voltype_t           type;           /* type of volume requested */
  46         int                     volnamesz;      /* size of volume name */
  47         const char              *volname;       /* name of volume to mount */
  48         struct afs_cell         *cell;          /* cell in which to find volume */
  49         struct afs_volume       *volume;        /* volume record */
  50         struct key              *key;           /* key to use for secure mounting */
  51 };
  52
  53 /*
  54  * definition of how to wait for the completion of an operation
  55  */
  56 struct afs_wait_mode {
  57         /* RxRPC received message notification */
  58         void (*rx_wakeup)(struct afs_call *call);
  59
  60         /* synchronous call waiter and call dispatched notification */
  61         int (*wait)(struct afs_call *call);
  62
  63         /* asynchronous call completion */
  64         void (*async_complete)(void *reply, int error);
  65 };
  66
  67 extern const struct afs_wait_mode afs_sync_call;
  68 extern const struct afs_wait_mode afs_async_call;
  69
  70 /*
  71  * a record of an in-progress RxRPC call
  72  */
  73 struct afs_call {
  74         const struct afs_call_type *type;       /* type of call */
  75         const struct afs_wait_mode *wait_mode;  /* completion wait mode */
  76         wait_queue_head_t       waitq;          /* processes awaiting completion */
  77         struct work_struct      async_work;     /* asynchronous work processor */
  78         struct work_struct      work;           /* actual work processor */
  79         struct sk_buff_head     rx_queue;       /* received packets */
  80         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
  81         struct key              *key;           /* security for this call */
  82         struct afs_server       *server;        /* server affected by incoming CM call */
  83         void                    *request;       /* request data (first part) */
  84         struct address_space    *mapping;       /* page set */
  85         struct afs_writeback    *wb;            /* writeback being performed */
  86         void                    *buffer;        /* reply receive buffer */
  87         void                    *reply;         /* reply buffer (first part) */
  88         void                    *reply2;        /* reply buffer (second part) */
  89         void                    *reply3;        /* reply buffer (third part) */
  90         void                    *reply4;        /* reply buffer (fourth part) */
  91         pgoff_t                 first;          /* first page in mapping to deal with */
  92         pgoff_t                 last;           /* last page in mapping to deal with */
  93         enum {                                  /* call state */
  94                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
  95                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
  96                 AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
  97                 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
  98                 AFS_CALL_REPLYING,      /* replying to incoming call */
  99                 AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
 100                 AFS_CALL_COMPLETE,      /* successfully completed */
 101                 AFS_CALL_BUSY,          /* server was busy */
 102                 AFS_CALL_ABORTED,       /* call was aborted */
 103                 AFS_CALL_ERROR,         /* call failed due to error */
 104         }                       state;
 105         int                     error;          /* error code */
 106         unsigned                request_size;   /* size of request data */
 107         unsigned                reply_max;      /* maximum size of reply */
 108         unsigned                reply_size;     /* current size of reply */
 109         unsigned                first_offset;   /* offset into mapping[first] */
 110         unsigned                last_to;        /* amount of mapping[last] */
 111         unsigned short          offset;         /* offset into received data store */
 112         unsigned char           unmarshall;     /* unmarshalling phase */
 113         bool                    incoming;       /* T if incoming call */
 114         bool                    send_pages;     /* T if data from mapping should be sent */
 115         u16                     service_id;     /* RxRPC service ID to call */
 116         __be16                  port;           /* target UDP port */
 117         __be32                  operation_ID;   /* operation ID for an incoming call */
 118         u32                     count;          /* count for use in unmarshalling */
 119         __be32                  tmp;            /* place to extract temporary data */
 120         afs_dataversion_t       store_version;  /* updated version expected from store */
 121 };
 122
 123 struct afs_call_type {
 124         const char *name;
 125
 126         /* deliver request or reply data to an call
 127          * - returning an error will cause the call to be aborted
 128          */
 129         int (*deliver)(struct afs_call *call, struct sk_buff *skb,
 130                        bool last);
 131
 132         /* map an abort code to an error number */
 133         int (*abort_to_error)(u32 abort_code);
 134
 135         /* clean up a call */
 136         void (*destructor)(struct afs_call *call);
 137 };
 138
 139 /*
 140  * record of an outstanding writeback on a vnode
 141  */
 142 struct afs_writeback {
 143         struct list_head        link;           /* link in vnode->writebacks */
 144         struct work_struct      writer;         /* work item to perform the writeback */
 145         struct afs_vnode        *vnode;         /* vnode to which this write applies */
 146         struct key              *key;           /* owner of this write */
 147         wait_queue_head_t       waitq;          /* completion and ready wait queue */
 148         pgoff_t                 first;          /* first page in batch */
 149         pgoff_t                 point;          /* last page in current store op */
 150         pgoff_t                 last;           /* last page in batch (inclusive) */
 151         unsigned                offset_first;   /* offset into first page of start of write */
 152         unsigned                to_last;        /* offset into last page of end of write */
 153         int                     num_conflicts;  /* count of conflicting writes in list */
 154         int                     usage;
 155         bool                    conflicts;      /* T if has dependent conflicts */
 156         enum {
 157                 AFS_WBACK_SYNCING,              /* synchronisation being performed */
 158                 AFS_WBACK_PENDING,              /* write pending */
 159                 AFS_WBACK_CONFLICTING,          /* conflicting writes posted */
 160                 AFS_WBACK_WRITING,              /* writing back */
 161                 AFS_WBACK_COMPLETE              /* the writeback record has been unlinked */
 162         } state __attribute__((packed));
 163 };
 164
 165 /*
 166  * AFS superblock private data
 167  * - there's one superblock per volume
 168  */
 169 struct afs_super_info {
 170         struct afs_volume       *volume;        /* volume record */
 171         char                    rwparent;       /* T if parent is R/W AFS volume */
 172 };
 173
 174 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 175 {
 176         return sb->s_fs_info;
 177 }
 178
 179 extern struct file_system_type afs_fs_type;
 180
 181 /*
 182  * entry in the cached cell catalogue
 183  */
 184 struct afs_cache_cell {
 185         char            name[AFS_MAXCELLNAME];  /* cell name (padded with NULs) */
 186         struct in_addr  vl_servers[15];         /* cached cell VL servers */
 187 };
 188
 189 /*
 190  * AFS cell record
 191  */
 192 struct afs_cell {
 193         atomic_t                usage;
 194         struct list_head        link;           /* main cell list link */
 195         struct key              *anonymous_key; /* anonymous user key for this cell */
 196         struct list_head        proc_link;      /* /proc cell list link */
 197         struct proc_dir_entry   *proc_dir;      /* /proc dir for this cell */
 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
 362         long                    acl_order;      /* ACL check count (callback break count) */
 363
 364         struct list_head        writebacks;     /* alterations in pagecache that need writing */
 365         struct list_head        pending_locks;  /* locks waiting to be granted */
 366         struct list_head        granted_locks;  /* locks granted on this file */
 367         struct delayed_work     lock_work;      /* work to be done in locking */
 368         struct key              *unlock_key;    /* key to be used in unlocking */
 369
 370         /* outstanding callback notification on this file */
 371         struct rb_node          server_rb;      /* link in server->fs_vnodes */
 372         struct rb_node          cb_promise;     /* link in server->cb_promises */
 373         struct work_struct      cb_broken_work; /* work to be done on callback break */
 374         time_t                  cb_expires;     /* time at which callback expires */
 375         time_t                  cb_expires_at;  /* time used to order cb_promise */
 376         unsigned                cb_version;     /* callback version */
 377         unsigned                cb_expiry;      /* callback expiry time */
 378         afs_callback_type_t     cb_type;        /* type of callback */
 379         bool                    cb_promised;    /* true if promise still holds */
 380 };
 381
 382 /*
 383  * cached security record for one user's attempt to access a vnode
 384  */
 385 struct afs_permit {
 386         struct key              *key;           /* RxRPC ticket holding a security context */
 387         afs_access_t            access_mask;    /* access mask for this key */
 388 };
 389
 390 /*
 391  * cache of security records from attempts to access a vnode
 392  */
 393 struct afs_permits {
 394         struct rcu_head         rcu;            /* disposal procedure */
 395         int                     count;          /* number of records */
 396         struct afs_permit       permits[0];     /* the permits so far examined */
 397 };
 398
 399 /*
 400  * record of one of a system's set of network interfaces
 401  */
 402 struct afs_interface {
 403         struct in_addr  address;        /* IPv4 address bound to interface */
 404         struct in_addr  netmask;        /* netmask applied to address */
 405         unsigned        mtu;            /* MTU of interface */
 406 };
 407
 408 /*
 409  * UUID definition [internet draft]
 410  * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
 411  *   increments since midnight 15th October 1582
 412  *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
 413  *     time
 414  * - the clock sequence is a 14-bit counter to avoid duplicate times
 415  */
 416 struct afs_uuid {
 417         u32             time_low;                       /* low part of timestamp */
 418         u16             time_mid;                       /* mid part of timestamp */
 419         u16             time_hi_and_version;            /* high part of timestamp and version  */
 420 #define AFS_UUID_TO_UNIX_TIME   0x01b21dd213814000ULL
 421 #define AFS_UUID_TIMEHI_MASK    0x0fff
 422 #define AFS_UUID_VERSION_TIME   0x1000  /* time-based UUID */
 423 #define AFS_UUID_VERSION_NAME   0x3000  /* name-based UUID */
 424 #define AFS_UUID_VERSION_RANDOM 0x4000  /* (pseudo-)random generated UUID */
 425         u8              clock_seq_hi_and_reserved;      /* clock seq hi and variant */
 426 #define AFS_UUID_CLOCKHI_MASK   0x3f
 427 #define AFS_UUID_VARIANT_STD    0x80
 428         u8              clock_seq_low;                  /* clock seq low */
 429         u8              node[6];                        /* spatially unique node ID (MAC addr) */
 430 };
 431
 432 /*****************************************************************************/
 433 /*
 434  * cache.c
 435  */
 436 #ifdef CONFIG_AFS_FSCACHE
 437 extern struct fscache_netfs afs_cache_netfs;
 438 extern struct fscache_cookie_def afs_cell_cache_index_def;
 439 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
 440 extern struct fscache_cookie_def afs_volume_cache_index_def;
 441 extern struct fscache_cookie_def afs_vnode_cache_index_def;
 442 #else
 443 #define afs_cell_cache_index_def        (*(struct fscache_cookie_def *) NULL)
 444 #define afs_vlocation_cache_index_def   (*(struct fscache_cookie_def *) NULL)
 445 #define afs_volume_cache_index_def      (*(struct fscache_cookie_def *) NULL)
 446 #define afs_vnode_cache_index_def       (*(struct fscache_cookie_def *) NULL)
 447 #endif
 448
 449 /*
 450  * callback.c
 451  */
 452 extern void afs_init_callback_state(struct afs_server *);
 453 extern void afs_broken_callback_work(struct work_struct *);
 454 extern void afs_break_callbacks(struct afs_server *, size_t,
 455                                 struct afs_callback[]);
 456 extern void afs_discard_callback_on_delete(struct afs_vnode *);
 457 extern void afs_give_up_callback(struct afs_vnode *);
 458 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 459 extern void afs_flush_callback_breaks(struct afs_server *);
 460 extern int __init afs_callback_update_init(void);
 461 extern void afs_callback_update_kill(void);
 462
 463 /*
 464  * cell.c
 465  */
 466 extern struct rw_semaphore afs_proc_cells_sem;
 467 extern struct list_head afs_proc_cells;
 468
 469 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
 470 extern int afs_cell_init(char *);
 471 extern struct afs_cell *afs_cell_create(const char *, char *);
 472 extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
 473 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
 474 extern void afs_put_cell(struct afs_cell *);
 475 extern void afs_cell_purge(void);
 476
 477 /*
 478  * cmservice.c
 479  */
 480 extern bool afs_cm_incoming_call(struct afs_call *);
 481
 482 /*
 483  * dir.c
 484  */
 485 extern const struct inode_operations afs_dir_inode_operations;
 486 extern const struct file_operations afs_dir_file_operations;
 487
 488 /*
 489  * file.c
 490  */
 491 extern const struct address_space_operations afs_fs_aops;
 492 extern const struct inode_operations afs_file_inode_operations;
 493 extern const struct file_operations afs_file_operations;
 494
 495 extern int afs_open(struct inode *, struct file *);
 496 extern int afs_release(struct inode *, struct file *);
 497
 498 /*
 499  * flock.c
 500  */
 501 extern void __exit afs_kill_lock_manager(void);
 502 extern void afs_lock_work(struct work_struct *);
 503 extern void afs_lock_may_be_available(struct afs_vnode *);
 504 extern int afs_lock(struct file *, int, struct file_lock *);
 505 extern int afs_flock(struct file *, int, struct file_lock *);
 506
 507 /*
 508  * fsclient.c
 509  */
 510 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
 511                                     struct afs_vnode *, struct afs_volsync *,
 512                                     const struct afs_wait_mode *);
 513 extern int afs_fs_give_up_callbacks(struct afs_server *,
 514                                     const struct afs_wait_mode *);
 515 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
 516                              struct afs_vnode *, off_t, size_t, struct page *,
 517                              const struct afs_wait_mode *);
 518 extern int afs_fs_create(struct afs_server *, struct key *,
 519                          struct afs_vnode *, const char *, umode_t,
 520                          struct afs_fid *, struct afs_file_status *,
 521                          struct afs_callback *,
 522                          const struct afs_wait_mode *);
 523 extern int afs_fs_remove(struct afs_server *, struct key *,
 524                          struct afs_vnode *, const char *, bool,
 525                          const struct afs_wait_mode *);
 526 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
 527                        struct afs_vnode *, const char *,
 528                        const struct afs_wait_mode *);
 529 extern int afs_fs_symlink(struct afs_server *, struct key *,
 530                           struct afs_vnode *, const char *, const char *,
 531                           struct afs_fid *, struct afs_file_status *,
 532                           const struct afs_wait_mode *);
 533 extern int afs_fs_rename(struct afs_server *, struct key *,
 534                          struct afs_vnode *, const char *,
 535                          struct afs_vnode *, const char *,
 536                          const struct afs_wait_mode *);
 537 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
 538                              pgoff_t, pgoff_t, unsigned, unsigned,
 539                              const struct afs_wait_mode *);
 540 extern int afs_fs_setattr(struct afs_server *, struct key *,
 541                           struct afs_vnode *, struct iattr *,
 542                           const struct afs_wait_mode *);
 543 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
 544                                     struct afs_vnode *,
 545                                     struct afs_volume_status *,
 546                                     const struct afs_wait_mode *);
 547 extern int afs_fs_set_lock(struct afs_server *, struct key *,
 548                            struct afs_vnode *, afs_lock_type_t,
 549                            const struct afs_wait_mode *);
 550 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
 551                               struct afs_vnode *,
 552                               const struct afs_wait_mode *);
 553 extern int afs_fs_release_lock(struct afs_server *, struct key *,
 554                                struct afs_vnode *,
 555                                const struct afs_wait_mode *);
 556
 557 /*
 558  * inode.c
 559  */
 560 extern struct inode *afs_iget(struct super_block *, struct key *,
 561                               struct afs_fid *, struct afs_file_status *,
 562                               struct afs_callback *);
 563 extern void afs_zap_data(struct afs_vnode *);
 564 extern int afs_validate(struct afs_vnode *, struct key *);
 565 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 566 extern int afs_setattr(struct dentry *, struct iattr *);
 567 extern void afs_clear_inode(struct inode *);
 568
 569 /*
 570  * main.c
 571  */
 572 extern struct afs_uuid afs_uuid;
 573
 574 /*
 575  * misc.c
 576  */
 577 extern int afs_abort_to_error(u32);
 578
 579 /*
 580  * mntpt.c
 581  */
 582 extern const struct inode_operations afs_mntpt_inode_operations;
 583 extern const struct file_operations afs_mntpt_file_operations;
 584
 585 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
 586 extern void afs_mntpt_kill_timer(void);
 587
 588 /*
 589  * proc.c
 590  */
 591 extern int afs_proc_init(void);
 592 extern void afs_proc_cleanup(void);
 593 extern int afs_proc_cell_setup(struct afs_cell *);
 594 extern void afs_proc_cell_remove(struct afs_cell *);
 595
 596 /*
 597  * rxrpc.c
 598  */
 599 extern int afs_open_socket(void);
 600 extern void afs_close_socket(void);
 601 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
 602                          const struct afs_wait_mode *);
 603 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 604                                             size_t, size_t);
 605 extern void afs_flat_call_destructor(struct afs_call *);
 606 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
 607 extern void afs_send_empty_reply(struct afs_call *);
 608 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
 609 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 610                             size_t);
 611
 612 /*
 613  * security.c
 614  */
 615 extern void afs_clear_permits(struct afs_vnode *);
 616 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
 617 extern void afs_zap_permits(struct rcu_head *);
 618 extern struct key *afs_request_key(struct afs_cell *);
 619 extern int afs_permission(struct inode *, int);
 620
 621 /*
 622  * server.c
 623  */
 624 extern spinlock_t afs_server_peer_lock;
 625
 626 #define afs_get_server(S)                                       \
 627 do {                                                            \
 628         _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
 629         atomic_inc(&(S)->usage);                                \
 630 } while(0)
 631
 632 extern struct afs_server *afs_lookup_server(struct afs_cell *,
 633                                             const struct in_addr *);
 634 extern struct afs_server *afs_find_server(const struct in_addr *);
 635 extern void afs_put_server(struct afs_server *);
 636 extern void __exit afs_purge_servers(void);
 637
 638 /*
 639  * super.c
 640  */
 641 extern int afs_fs_init(void);
 642 extern void afs_fs_exit(void);
 643
 644 /*
 645  * use-rtnetlink.c
 646  */
 647 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
 648 extern int afs_get_MAC_address(u8 *, size_t);
 649
 650 /*
 651  * vlclient.c
 652  */
 653 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
 654                                     const char *, struct afs_cache_vlocation *,
 655                                     const struct afs_wait_mode *);
 656 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
 657                                   afs_volid_t, afs_voltype_t,
 658                                   struct afs_cache_vlocation *,
 659                                   const struct afs_wait_mode *);
 660
 661 /*
 662  * vlocation.c
 663  */
 664 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
 665
 666 extern int __init afs_vlocation_update_init(void);
 667 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
 668                                                   struct key *,
 669                                                   const char *, size_t);
 670 extern void afs_put_vlocation(struct afs_vlocation *);
 671 extern void afs_vlocation_purge(void);
 672
 673 /*
 674  * vnode.c
 675  */
 676 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
 677 {
 678         return container_of(inode, struct afs_vnode, vfs_inode);
 679 }
 680
 681 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 682 {
 683         return &vnode->vfs_inode;
 684 }
 685
 686 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
 687                                              struct afs_server *);
 688 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
 689                                   struct key *);
 690 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
 691                                 off_t, size_t, struct page *);
 692 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
 693                             umode_t, struct afs_fid *, struct afs_file_status *,
 694                             struct afs_callback *, struct afs_server **);
 695 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
 696                             bool);
 697 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
 698                           const char *);
 699 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
 700                              const char *, struct afs_fid *,
 701                              struct afs_file_status *, struct afs_server **);
 702 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
 703                             struct key *, const char *, const char *);
 704 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
 705                                 unsigned, unsigned);
 706 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
 707 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
 708                                        struct afs_volume_status *);
 709 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
 710                               afs_lock_type_t);
 711 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
 712 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
 713
 714 /*
 715  * volume.c
 716  */
 717 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
 718
 719 extern void afs_put_volume(struct afs_volume *);
 720 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
 721 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
 722 extern int afs_volume_release_fileserver(struct afs_vnode *,
 723                                          struct afs_server *, int);
 724
 725 /*
 726  * write.c
 727  */
 728 extern int afs_set_page_dirty(struct page *);
 729 extern void afs_put_writeback(struct afs_writeback *);
 730 extern int afs_write_begin(struct file *file, struct address_space *mapping,
 731                         loff_t pos, unsigned len, unsigned flags,
 732                         struct page **pagep, void **fsdata);
 733 extern int afs_write_end(struct file *file, struct address_space *mapping,
 734                         loff_t pos, unsigned len, unsigned copied,
 735                         struct page *page, void *fsdata);
 736 extern int afs_writepage(struct page *, struct writeback_control *);
 737 extern int afs_writepages(struct address_space *, struct writeback_control *);
 738 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 739 extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
 740                               unsigned long, loff_t);
 741 extern int afs_writeback_all(struct afs_vnode *);
 742 extern int afs_fsync(struct file *, struct dentry *, int);
 743
 744
 745 /*****************************************************************************/
 746 /*
 747  * debug tracing
 748  */
 749 extern unsigned afs_debug;
 750
 751 #define dbgprintk(FMT,...) \
 752         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 753
 754 /* make sure we maintain the format strings, even when debugging is disabled */
 755 static inline __attribute__((format(printf,1,2)))
 756 void _dbprintk(const char *fmt, ...)
 757 {
 758 }
 759
 760 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 761 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 762 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 763
 764
 765 #if defined(__KDEBUG)
 766 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 767 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 768 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 769
 770 #elif defined(CONFIG_AFS_DEBUG)
 771 #define AFS_DEBUG_KENTER        0x01
 772 #define AFS_DEBUG_KLEAVE        0x02
 773 #define AFS_DEBUG_KDEBUG        0x04
 774
 775 #define _enter(FMT,...)                                 \
 776 do {                                                    \
 777         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
 778                 kenter(FMT,##__VA_ARGS__);              \
 779 } while (0)
 780
 781 #define _leave(FMT,...)                                 \
 782 do {                                                    \
 783         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
 784                 kleave(FMT,##__VA_ARGS__);              \
 785 } while (0)
 786
 787 #define _debug(FMT,...)                                 \
 788 do {                                                    \
 789         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
 790                 kdebug(FMT,##__VA_ARGS__);              \
 791 } while (0)
 792
 793 #else
 794 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 795 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 796 #define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
 797 #endif
 798
 799 /*
 800  * debug assertion checking
 801  */
 802 #if 1 // defined(__KDEBUGALL)
 803
 804 #define ASSERT(X)                                               \
 805 do {                                                            \
 806         if (unlikely(!(X))) {                                   \
 807                 printk(KERN_ERR "\n");                          \
 808                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 809                 BUG();                                          \
 810         }                                                       \
 811 } while(0)
 812
 813 #define ASSERTCMP(X, OP, Y)                                             \
 814 do {                                                                    \
 815         if (unlikely(!((X) OP (Y)))) {                                  \
 816                 printk(KERN_ERR "\n");                                  \
 817                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 818                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 819                        (unsigned long)(X), (unsigned long)(Y));         \
 820                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 821                        (unsigned long)(X), (unsigned long)(Y));         \
 822                 BUG();                                                  \
 823         }                                                               \
 824 } while(0)
 825
 826 #define ASSERTRANGE(L, OP1, N, OP2, H)                                  \
 827 do {                                                                    \
 828         if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {               \
 829                 printk(KERN_ERR "\n");                                  \
 830                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 831                 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
 832                        (unsigned long)(L), (unsigned long)(N),          \
 833                        (unsigned long)(H));                             \
 834                 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
 835                        (unsigned long)(L), (unsigned long)(N),          \
 836                        (unsigned long)(H));                             \
 837                 BUG();                                                  \
 838         }                                                               \
 839 } while(0)
 840
 841 #define ASSERTIF(C, X)                                          \
 842 do {                                                            \
 843         if (unlikely((C) && !(X))) {                            \
 844                 printk(KERN_ERR "\n");                          \
 845                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 846                 BUG();                                          \
 847         }                                                       \
 848 } while(0)
 849
 850 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 851 do {                                                                    \
 852         if (unlikely((C) && !((X) OP (Y)))) {                           \
 853                 printk(KERN_ERR "\n");                                  \
 854                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 855                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 856                        (unsigned long)(X), (unsigned long)(Y));         \
 857                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 858                        (unsigned long)(X), (unsigned long)(Y));         \
 859                 BUG();                                                  \
 860         }                                                               \
 861 } while(0)
 862
 863 #else
 864
 865 #define ASSERT(X)                               \
 866 do {                                            \
 867 } while(0)
 868
 869 #define ASSERTCMP(X, OP, Y)                     \
 870 do {                                            \
 871 } while(0)
 872
 873 #define ASSERTRANGE(L, OP1, N, OP2, H)          \
 874 do {                                            \
 875 } while(0)
 876
 877 #define ASSERTIF(C, X)                          \
 878 do {                                            \
 879 } while(0)
 880
 881 #define ASSERTIFCMP(C, X, OP, Y)                \
 882 do {                                            \
 883 } while(0)
 884
 885 #endif /* __KDEBUGALL */