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 "afs.h"
  20 #include "afs_vl.h"
  21
  22 #define AFS_CELL_MAX_ADDRS 15
  23
  24 struct afs_call;
  25
  26 typedef enum {
  27         AFS_VL_NEW,                     /* new, uninitialised record */
  28         AFS_VL_CREATING,                /* creating record */
  29         AFS_VL_VALID,                   /* record is pending */
  30         AFS_VL_NO_VOLUME,               /* no such volume available */
  31         AFS_VL_UPDATING,                /* update in progress */
  32         AFS_VL_VOLUME_DELETED,          /* volume was deleted */
  33         AFS_VL_UNCERTAIN,               /* uncertain state (update failed) */
  34 } __attribute__((packed)) afs_vlocation_state_t;
  35
  36 struct afs_mount_params {
  37         bool                    rwpath;         /* T if the parent should be considered R/W */
  38         bool                    force;          /* T to force cell type */
  39         afs_voltype_t           type;           /* type of volume requested */
  40         int                     volnamesz;      /* size of volume name */
  41         const char              *volname;       /* name of volume to mount */
  42         struct afs_cell         *cell;          /* cell in which to find volume */
  43         struct afs_volume       *volume;        /* volume record */
  44         struct key              *key;           /* key to use for secure mounting */
  45 };
  46
  47 /*
  48  * definition of how to wait for the completion of an operation
  49  */
  50 struct afs_wait_mode {
  51         /* RxRPC received message notification */
  52         void (*rx_wakeup)(struct afs_call *call);
  53
  54         /* synchronous call waiter and call dispatched notification */
  55         int (*wait)(struct afs_call *call);
  56
  57         /* asynchronous call completion */
  58         void (*async_complete)(void *reply, int error);
  59 };
  60
  61 extern const struct afs_wait_mode afs_sync_call;
  62 extern const struct afs_wait_mode afs_async_call;
  63
  64 /*
  65  * a record of an in-progress RxRPC call
  66  */
  67 struct afs_call {
  68         const struct afs_call_type *type;       /* type of call */
  69         const struct afs_wait_mode *wait_mode;  /* completion wait mode */
  70         wait_queue_head_t       waitq;          /* processes awaiting completion */
  71         struct work_struct      async_work;     /* asynchronous work processor */
  72         struct work_struct      work;           /* actual work processor */
  73         struct sk_buff_head     rx_queue;       /* received packets */
  74         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
  75         struct key              *key;           /* security for this call */
  76         struct afs_server       *server;        /* server affected by incoming CM call */
  77         void                    *request;       /* request data (first part) */
  78         void                    *request2;      /* request data (second part) */
  79         void                    *buffer;        /* reply receive buffer */
  80         void                    *reply;         /* reply buffer (first part) */
  81         void                    *reply2;        /* reply buffer (second part) */
  82         void                    *reply3;        /* reply buffer (third part) */
  83         void                    *reply4;        /* reply buffer (fourth part) */
  84         enum {                                  /* call state */
  85                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
  86                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
  87                 AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
  88                 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
  89                 AFS_CALL_REPLYING,      /* replying to incoming call */
  90                 AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
  91                 AFS_CALL_COMPLETE,      /* successfully completed */
  92                 AFS_CALL_BUSY,          /* server was busy */
  93                 AFS_CALL_ABORTED,       /* call was aborted */
  94                 AFS_CALL_ERROR,         /* call failed due to error */
  95         }                       state;
  96         int                     error;          /* error code */
  97         unsigned                request_size;   /* size of request data */
  98         unsigned                reply_max;      /* maximum size of reply */
  99         unsigned                reply_size;     /* current size of reply */
 100         unsigned short          offset;         /* offset into received data store */
 101         unsigned char           unmarshall;     /* unmarshalling phase */
 102         bool                    incoming;       /* T if incoming call */
 103         u16                     service_id;     /* RxRPC service ID to call */
 104         __be16                  port;           /* target UDP port */
 105         __be32                  operation_ID;   /* operation ID for an incoming call */
 106         u32                     count;          /* count for use in unmarshalling */
 107         __be32                  tmp;            /* place to extract temporary data */
 108 };
 109
 110 struct afs_call_type {
 111         const char *name;
 112
 113         /* deliver request or reply data to an call
 114          * - returning an error will cause the call to be aborted
 115          */
 116         int (*deliver)(struct afs_call *call, struct sk_buff *skb,
 117                        bool last);
 118
 119         /* map an abort code to an error number */
 120         int (*abort_to_error)(u32 abort_code);
 121
 122         /* clean up a call */
 123         void (*destructor)(struct afs_call *call);
 124 };
 125
 126 /*
 127  * AFS superblock private data
 128  * - there's one superblock per volume
 129  */
 130 struct afs_super_info {
 131         struct afs_volume       *volume;        /* volume record */
 132         char                    rwparent;       /* T if parent is R/W AFS volume */
 133 };
 134
 135 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 136 {
 137         return sb->s_fs_info;
 138 }
 139
 140 extern struct file_system_type afs_fs_type;
 141
 142 /*
 143  * entry in the cached cell catalogue
 144  */
 145 struct afs_cache_cell {
 146         char            name[AFS_MAXCELLNAME];  /* cell name (padded with NULs) */
 147         struct in_addr  vl_servers[15];         /* cached cell VL servers */
 148 };
 149
 150 /*
 151  * AFS cell record
 152  */
 153 struct afs_cell {
 154         atomic_t                usage;
 155         struct list_head        link;           /* main cell list link */
 156         struct key              *anonymous_key; /* anonymous user key for this cell */
 157         struct list_head        proc_link;      /* /proc cell list link */
 158         struct proc_dir_entry   *proc_dir;      /* /proc dir for this cell */
 159 #ifdef AFS_CACHING_SUPPORT
 160         struct cachefs_cookie   *cache;         /* caching cookie */
 161 #endif
 162
 163         /* server record management */
 164         rwlock_t                servers_lock;   /* active server list lock */
 165         struct list_head        servers;        /* active server list */
 166
 167         /* volume location record management */
 168         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
 169         struct list_head        vl_list;        /* cell's active VL record list */
 170         spinlock_t              vl_lock;        /* vl_list lock */
 171         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
 172         unsigned short          vl_curr_svix;   /* current server index */
 173         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
 174
 175         char                    name[0];        /* cell name - must go last */
 176 };
 177
 178 /*
 179  * entry in the cached volume location catalogue
 180  */
 181 struct afs_cache_vlocation {
 182         /* volume name (lowercase, padded with NULs) */
 183         uint8_t                 name[AFS_MAXVOLNAME + 1];
 184
 185         uint8_t                 nservers;       /* number of entries used in servers[] */
 186         uint8_t                 vidmask;        /* voltype mask for vid[] */
 187         uint8_t                 srvtmask[8];    /* voltype masks for servers[] */
 188 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
 189 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
 190 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
 191
 192         afs_volid_t             vid[3];         /* volume IDs for R/W, R/O and Bak volumes */
 193         struct in_addr          servers[8];     /* fileserver addresses */
 194         time_t                  rtime;          /* last retrieval time */
 195 };
 196
 197 /*
 198  * volume -> vnode hash table entry
 199  */
 200 struct afs_cache_vhash {
 201         afs_voltype_t           vtype;          /* which volume variation */
 202         uint8_t                 hash_bucket;    /* which hash bucket this represents */
 203 } __attribute__((packed));
 204
 205 /*
 206  * AFS volume location record
 207  */
 208 struct afs_vlocation {
 209         atomic_t                usage;
 210         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 211         struct list_head        link;           /* link in cell volume location list */
 212         struct list_head        grave;          /* link in master graveyard list */
 213         struct list_head        update;         /* link in master update list */
 214         struct afs_cell         *cell;          /* cell to which volume belongs */
 215 #ifdef AFS_CACHING_SUPPORT
 216         struct cachefs_cookie   *cache;         /* caching cookie */
 217 #endif
 218         struct afs_cache_vlocation vldb;        /* volume information DB record */
 219         struct afs_volume       *vols[3];       /* volume access record pointer (index by type) */
 220         wait_queue_head_t       waitq;          /* status change waitqueue */
 221         time_t                  update_at;      /* time at which record should be updated */
 222         spinlock_t              lock;           /* access lock */
 223         afs_vlocation_state_t   state;          /* volume location state */
 224         unsigned short          upd_rej_cnt;    /* ENOMEDIUM count during update */
 225         unsigned short          upd_busy_cnt;   /* EBUSY count during update */
 226         bool                    valid;          /* T if valid */
 227 };
 228
 229 /*
 230  * AFS fileserver record
 231  */
 232 struct afs_server {
 233         atomic_t                usage;
 234         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 235         struct in_addr          addr;           /* server address */
 236         struct afs_cell         *cell;          /* cell in which server resides */
 237         struct list_head        link;           /* link in cell's server list */
 238         struct list_head        grave;          /* link in master graveyard list */
 239         struct rb_node          master_rb;      /* link in master by-addr tree */
 240         struct rw_semaphore     sem;            /* access lock */
 241
 242         /* file service access */
 243         struct rb_root          fs_vnodes;      /* vnodes backed by this server (ordered by FID) */
 244         unsigned long           fs_act_jif;     /* time at which last activity occurred */
 245         unsigned long           fs_dead_jif;    /* time at which no longer to be considered dead */
 246         spinlock_t              fs_lock;        /* access lock */
 247         int                     fs_state;       /* 0 or reason FS currently marked dead (-errno) */
 248
 249         /* callback promise management */
 250         struct rb_root          cb_promises;    /* vnode expiration list (ordered earliest first) */
 251         struct delayed_work     cb_updater;     /* callback updater */
 252         struct delayed_work     cb_break_work;  /* collected break dispatcher */
 253         wait_queue_head_t       cb_break_waitq; /* space available in cb_break waitqueue */
 254         spinlock_t              cb_lock;        /* access lock */
 255         struct afs_callback     cb_break[64];   /* ring of callbacks awaiting breaking */
 256         atomic_t                cb_break_n;     /* number of pending breaks */
 257         u8                      cb_break_head;  /* head of callback breaking ring */
 258         u8                      cb_break_tail;  /* tail of callback breaking ring */
 259 };
 260
 261 /*
 262  * AFS volume access record
 263  */
 264 struct afs_volume {
 265         atomic_t                usage;
 266         struct afs_cell         *cell;          /* cell to which belongs (unrefd ptr) */
 267         struct afs_vlocation    *vlocation;     /* volume location */
 268 #ifdef AFS_CACHING_SUPPORT
 269         struct cachefs_cookie   *cache;         /* caching cookie */
 270 #endif
 271         afs_volid_t             vid;            /* volume ID */
 272         afs_voltype_t           type;           /* type of volume */
 273         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
 274         unsigned short          nservers;       /* number of server slots filled */
 275         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
 276         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
 277         struct rw_semaphore     server_sem;     /* lock for accessing current server */
 278 };
 279
 280 /*
 281  * vnode catalogue entry
 282  */
 283 struct afs_cache_vnode {
 284         afs_vnodeid_t           vnode_id;       /* vnode ID */
 285         unsigned                vnode_unique;   /* vnode ID uniquifier */
 286         afs_dataversion_t       data_version;   /* data version */
 287 };
 288
 289 /*
 290  * AFS inode private data
 291  */
 292 struct afs_vnode {
 293         struct inode            vfs_inode;      /* the VFS's inode record */
 294
 295         struct afs_volume       *volume;        /* volume on which vnode resides */
 296         struct afs_server       *server;        /* server currently supplying this file */
 297         struct afs_fid          fid;            /* the file identifier for this inode */
 298         struct afs_file_status  status;         /* AFS status info for this file */
 299 #ifdef AFS_CACHING_SUPPORT
 300         struct cachefs_cookie   *cache;         /* caching cookie */
 301 #endif
 302         struct afs_permits      *permits;       /* cache of permits so far obtained */
 303         struct mutex            permits_lock;   /* lock for altering permits list */
 304         struct mutex            validate_lock;  /* lock for validating this vnode */
 305         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
 306         int                     update_cnt;     /* number of outstanding ops that will update the
 307                                                  * status */
 308         spinlock_t              lock;           /* waitqueue/flags lock */
 309         unsigned long           flags;
 310 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
 311 #define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
 312 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
 313 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 314 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 315 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
 316
 317         long                    acl_order;      /* ACL check count (callback break count) */
 318
 319         /* outstanding callback notification on this file */
 320         struct rb_node          server_rb;      /* link in server->fs_vnodes */
 321         struct rb_node          cb_promise;     /* link in server->cb_promises */
 322         struct work_struct      cb_broken_work; /* work to be done on callback break */
 323         time_t                  cb_expires;     /* time at which callback expires */
 324         time_t                  cb_expires_at;  /* time used to order cb_promise */
 325         unsigned                cb_version;     /* callback version */
 326         unsigned                cb_expiry;      /* callback expiry time */
 327         afs_callback_type_t     cb_type;        /* type of callback */
 328         bool                    cb_promised;    /* true if promise still holds */
 329 };
 330
 331 /*
 332  * cached security record for one user's attempt to access a vnode
 333  */
 334 struct afs_permit {
 335         struct key              *key;           /* RxRPC ticket holding a security context */
 336         afs_access_t            access_mask;    /* access mask for this key */
 337 };
 338
 339 /*
 340  * cache of security records from attempts to access a vnode
 341  */
 342 struct afs_permits {
 343         struct rcu_head         rcu;            /* disposal procedure */
 344         int                     count;          /* number of records */
 345         struct afs_permit       permits[0];     /* the permits so far examined */
 346 };
 347
 348 /*
 349  * record of one of a system's set of network interfaces
 350  */
 351 struct afs_interface {
 352         struct in_addr  address;        /* IPv4 address bound to interface */
 353         struct in_addr  netmask;        /* netmask applied to address */
 354         unsigned        mtu;            /* MTU of interface */
 355 };
 356
 357 /*
 358  * UUID definition [internet draft]
 359  * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
 360  *   increments since midnight 15th October 1582
 361  *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
 362  *     time
 363  * - the clock sequence is a 14-bit counter to avoid duplicate times
 364  */
 365 struct afs_uuid {
 366         u32             time_low;                       /* low part of timestamp */
 367         u16             time_mid;                       /* mid part of timestamp */
 368         u16             time_hi_and_version;            /* high part of timestamp and version  */
 369 #define AFS_UUID_TO_UNIX_TIME   0x01b21dd213814000ULL
 370 #define AFS_UUID_TIMEHI_MASK    0x0fff
 371 #define AFS_UUID_VERSION_TIME   0x1000  /* time-based UUID */
 372 #define AFS_UUID_VERSION_NAME   0x3000  /* name-based UUID */
 373 #define AFS_UUID_VERSION_RANDOM 0x4000  /* (pseudo-)random generated UUID */
 374         u8              clock_seq_hi_and_reserved;      /* clock seq hi and variant */
 375 #define AFS_UUID_CLOCKHI_MASK   0x3f
 376 #define AFS_UUID_VARIANT_STD    0x80
 377         u8              clock_seq_low;                  /* clock seq low */
 378         u8              node[6];                        /* spatially unique node ID (MAC addr) */
 379 };
 380
 381 /*****************************************************************************/
 382 /*
 383  * callback.c
 384  */
 385 extern void afs_init_callback_state(struct afs_server *);
 386 extern void afs_broken_callback_work(struct work_struct *);
 387 extern void afs_break_callbacks(struct afs_server *, size_t,
 388                                 struct afs_callback[]);
 389 extern void afs_discard_callback_on_delete(struct afs_vnode *);
 390 extern void afs_give_up_callback(struct afs_vnode *);
 391 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 392 extern void afs_flush_callback_breaks(struct afs_server *);
 393 extern int __init afs_callback_update_init(void);
 394 extern void afs_callback_update_kill(void);
 395
 396 /*
 397  * cell.c
 398  */
 399 extern struct rw_semaphore afs_proc_cells_sem;
 400 extern struct list_head afs_proc_cells;
 401 #ifdef AFS_CACHING_SUPPORT
 402 extern struct cachefs_index_def afs_cache_cell_index_def;
 403 #endif
 404
 405 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
 406 extern int afs_cell_init(char *);
 407 extern struct afs_cell *afs_cell_create(const char *, char *);
 408 extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
 409 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
 410 extern void afs_put_cell(struct afs_cell *);
 411 extern void afs_cell_purge(void);
 412
 413 /*
 414  * cmservice.c
 415  */
 416 extern bool afs_cm_incoming_call(struct afs_call *);
 417
 418 /*
 419  * dir.c
 420  */
 421 extern const struct inode_operations afs_dir_inode_operations;
 422 extern const struct file_operations afs_dir_file_operations;
 423
 424 extern int afs_permission(struct inode *, int, struct nameidata *);
 425
 426 /*
 427  * file.c
 428  */
 429 extern const struct address_space_operations afs_fs_aops;
 430 extern const struct inode_operations afs_file_inode_operations;
 431 extern const struct file_operations afs_file_operations;
 432
 433 extern int afs_open(struct inode *, struct file *);
 434 extern int afs_release(struct inode *, struct file *);
 435
 436 #ifdef AFS_CACHING_SUPPORT
 437 extern int afs_cache_get_page_cookie(struct page *, struct cachefs_page **);
 438 #endif
 439
 440 /*
 441  * fsclient.c
 442  */
 443 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
 444                                     struct afs_vnode *, struct afs_volsync *,
 445                                     const struct afs_wait_mode *);
 446 extern int afs_fs_give_up_callbacks(struct afs_server *,
 447                                     const struct afs_wait_mode *);
 448 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
 449                              struct afs_vnode *, off_t, size_t, struct page *,
 450                              const struct afs_wait_mode *);
 451 extern int afs_fs_create(struct afs_server *, struct key *,
 452                          struct afs_vnode *, const char *, umode_t,
 453                          struct afs_fid *, struct afs_file_status *,
 454                          struct afs_callback *,
 455                          const struct afs_wait_mode *);
 456 extern int afs_fs_remove(struct afs_server *, struct key *,
 457                          struct afs_vnode *, const char *, bool,
 458                          const struct afs_wait_mode *);
 459 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
 460                        struct afs_vnode *, const char *,
 461                        const struct afs_wait_mode *);
 462 extern int afs_fs_symlink(struct afs_server *, struct key *,
 463                           struct afs_vnode *, const char *, const char *,
 464                           struct afs_fid *, struct afs_file_status *,
 465                           const struct afs_wait_mode *);
 466 extern int afs_fs_rename(struct afs_server *, struct key *,
 467                          struct afs_vnode *, const char *,
 468                          struct afs_vnode *, const char *,
 469                          const struct afs_wait_mode *);
 470
 471 /*
 472  * inode.c
 473  */
 474 extern struct inode *afs_iget(struct super_block *, struct key *,
 475                               struct afs_fid *, struct afs_file_status *,
 476                               struct afs_callback *);
 477 extern int afs_validate(struct afs_vnode *, struct key *);
 478 extern int afs_inode_getattr(struct vfsmount *, struct dentry *,
 479                              struct kstat *);
 480 extern void afs_zap_permits(struct rcu_head *);
 481 extern void afs_clear_inode(struct inode *);
 482
 483 /*
 484  * main.c
 485  */
 486 extern struct afs_uuid afs_uuid;
 487 #ifdef AFS_CACHING_SUPPORT
 488 extern struct cachefs_netfs afs_cache_netfs;
 489 #endif
 490
 491 /*
 492  * misc.c
 493  */
 494 extern int afs_abort_to_error(u32);
 495
 496 /*
 497  * mntpt.c
 498  */
 499 extern const struct inode_operations afs_mntpt_inode_operations;
 500 extern const struct file_operations afs_mntpt_file_operations;
 501 extern unsigned long afs_mntpt_expiry_timeout;
 502
 503 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
 504 extern void afs_mntpt_kill_timer(void);
 505 extern void afs_umount_begin(struct vfsmount *, int);
 506
 507 /*
 508  * proc.c
 509  */
 510 extern int afs_proc_init(void);
 511 extern void afs_proc_cleanup(void);
 512 extern int afs_proc_cell_setup(struct afs_cell *);
 513 extern void afs_proc_cell_remove(struct afs_cell *);
 514
 515 /*
 516  * rxrpc.c
 517  */
 518 extern int afs_open_socket(void);
 519 extern void afs_close_socket(void);
 520 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
 521                          const struct afs_wait_mode *);
 522 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 523                                             size_t, size_t);
 524 extern void afs_flat_call_destructor(struct afs_call *);
 525 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
 526 extern void afs_send_empty_reply(struct afs_call *);
 527 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
 528 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 529                             size_t);
 530
 531 /*
 532  * security.c
 533  */
 534 extern void afs_clear_permits(struct afs_vnode *);
 535 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
 536 extern struct key *afs_request_key(struct afs_cell *);
 537 extern int afs_permission(struct inode *, int, struct nameidata *);
 538
 539 /*
 540  * server.c
 541  */
 542 extern spinlock_t afs_server_peer_lock;
 543
 544 #define afs_get_server(S)                                       \
 545 do {                                                            \
 546         _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
 547         atomic_inc(&(S)->usage);                                \
 548 } while(0)
 549
 550 extern struct afs_server *afs_lookup_server(struct afs_cell *,
 551                                             const struct in_addr *);
 552 extern struct afs_server *afs_find_server(const struct in_addr *);
 553 extern void afs_put_server(struct afs_server *);
 554 extern void __exit afs_purge_servers(void);
 555
 556 /*
 557  * super.c
 558  */
 559 extern int afs_fs_init(void);
 560 extern void afs_fs_exit(void);
 561
 562 /*
 563  * use-rtnetlink.c
 564  */
 565 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
 566 extern int afs_get_MAC_address(u8 *, size_t);
 567
 568 /*
 569  * vlclient.c
 570  */
 571 #ifdef AFS_CACHING_SUPPORT
 572 extern struct cachefs_index_def afs_vlocation_cache_index_def;
 573 #endif
 574
 575 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
 576                                     const char *, struct afs_cache_vlocation *,
 577                                     const struct afs_wait_mode *);
 578 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
 579                                   afs_volid_t, afs_voltype_t,
 580                                   struct afs_cache_vlocation *,
 581                                   const struct afs_wait_mode *);
 582
 583 /*
 584  * vlocation.c
 585  */
 586 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
 587
 588 extern int __init afs_vlocation_update_init(void);
 589 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
 590                                                   struct key *,
 591                                                   const char *, size_t);
 592 extern void afs_put_vlocation(struct afs_vlocation *);
 593 extern void afs_vlocation_purge(void);
 594
 595 /*
 596  * vnode.c
 597  */
 598 #ifdef AFS_CACHING_SUPPORT
 599 extern struct cachefs_index_def afs_vnode_cache_index_def;
 600 #endif
 601
 602 extern struct afs_timer_ops afs_vnode_cb_timed_out_ops;
 603
 604 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
 605 {
 606         return container_of(inode, struct afs_vnode, vfs_inode);
 607 }
 608
 609 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 610 {
 611         return &vnode->vfs_inode;
 612 }
 613
 614 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
 615                                              struct afs_server *);
 616 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
 617                                   struct key *);
 618 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
 619                                 off_t, size_t, struct page *);
 620 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
 621                             umode_t, struct afs_fid *, struct afs_file_status *,
 622                             struct afs_callback *, struct afs_server **);
 623 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
 624                             bool);
 625 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
 626                           const char *);
 627 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
 628                              const char *, struct afs_fid *,
 629                              struct afs_file_status *, struct afs_server **);
 630 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
 631                             struct key *, const char *, const char *);
 632
 633 /*
 634  * volume.c
 635  */
 636 #ifdef AFS_CACHING_SUPPORT
 637 extern struct cachefs_index_def afs_volume_cache_index_def;
 638 #endif
 639
 640 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
 641
 642 extern void afs_put_volume(struct afs_volume *);
 643 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
 644 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
 645 extern int afs_volume_release_fileserver(struct afs_vnode *,
 646                                          struct afs_server *, int);
 647
 648 /*****************************************************************************/
 649 /*
 650  * debug tracing
 651  */
 652 extern unsigned afs_debug;
 653
 654 #define dbgprintk(FMT,...) \
 655         printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__)
 656
 657 /* make sure we maintain the format strings, even when debugging is disabled */
 658 static inline __attribute__((format(printf,1,2)))
 659 void _dbprintk(const char *fmt, ...)
 660 {
 661 }
 662
 663 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
 664 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
 665 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 666
 667
 668 #if defined(__KDEBUG)
 669 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 670 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 671 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 672
 673 #elif defined(CONFIG_AFS_DEBUG)
 674 #define AFS_DEBUG_KENTER        0x01
 675 #define AFS_DEBUG_KLEAVE        0x02
 676 #define AFS_DEBUG_KDEBUG        0x04
 677
 678 #define _enter(FMT,...)                                 \
 679 do {                                                    \
 680         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
 681                 kenter(FMT,##__VA_ARGS__);              \
 682 } while (0)
 683
 684 #define _leave(FMT,...)                                 \
 685 do {                                                    \
 686         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
 687                 kleave(FMT,##__VA_ARGS__);              \
 688 } while (0)
 689
 690 #define _debug(FMT,...)                                 \
 691 do {                                                    \
 692         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
 693                 kdebug(FMT,##__VA_ARGS__);              \
 694 } while (0)
 695
 696 #else
 697 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
 698 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
 699 #define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
 700 #endif
 701
 702 /*
 703  * debug assertion checking
 704  */
 705 #if 1 // defined(__KDEBUGALL)
 706
 707 #define ASSERT(X)                                               \
 708 do {                                                            \
 709         if (unlikely(!(X))) {                                   \
 710                 printk(KERN_ERR "\n");                          \
 711                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 712                 BUG();                                          \
 713         }                                                       \
 714 } while(0)
 715
 716 #define ASSERTCMP(X, OP, Y)                                             \
 717 do {                                                                    \
 718         if (unlikely(!((X) OP (Y)))) {                                  \
 719                 printk(KERN_ERR "\n");                                  \
 720                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 721                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 722                        (unsigned long)(X), (unsigned long)(Y));         \
 723                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 724                        (unsigned long)(X), (unsigned long)(Y));         \
 725                 BUG();                                                  \
 726         }                                                               \
 727 } while(0)
 728
 729 #define ASSERTIF(C, X)                                          \
 730 do {                                                            \
 731         if (unlikely((C) && !(X))) {                            \
 732                 printk(KERN_ERR "\n");                          \
 733                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 734                 BUG();                                          \
 735         }                                                       \
 736 } while(0)
 737
 738 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 739 do {                                                                    \
 740         if (unlikely((C) && !((X) OP (Y)))) {                           \
 741                 printk(KERN_ERR "\n");                                  \
 742                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 743                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 744                        (unsigned long)(X), (unsigned long)(Y));         \
 745                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 746                        (unsigned long)(X), (unsigned long)(Y));         \
 747                 BUG();                                                  \
 748         }                                                               \
 749 } while(0)
 750
 751 #else
 752
 753 #define ASSERT(X)                               \
 754 do {                                            \
 755 } while(0)
 756
 757 #define ASSERTCMP(X, OP, Y)                     \
 758 do {                                            \
 759 } while(0)
 760
 761 #define ASSERTIF(C, X)                          \
 762 do {                                            \
 763 } while(0)
 764
 765 #define ASSERTIFCMP(C, X, OP, Y)                \
 766 do {                                            \
 767 } while(0)
 768
 769 #endif /* __KDEBUGALL */