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         void (*async_workfn)(struct afs_call *call); /* asynchronous work function */
  79         struct work_struct      async_work;     /* asynchronous work processor */
  80         struct work_struct      work;           /* actual work processor */
  81         struct sk_buff_head     rx_queue;       /* received packets */
  82         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
  83         struct key              *key;           /* security for this call */
  84         struct afs_server       *server;        /* server affected by incoming CM call */
  85         void                    *request;       /* request data (first part) */
  86         struct address_space    *mapping;       /* page set */
  87         struct afs_writeback    *wb;            /* writeback being performed */
  88         void                    *buffer;        /* reply receive buffer */
  89         void                    *reply;         /* reply buffer (first part) */
  90         void                    *reply2;        /* reply buffer (second part) */
  91         void                    *reply3;        /* reply buffer (third part) */
  92         void                    *reply4;        /* reply buffer (fourth part) */
  93         pgoff_t                 first;          /* first page in mapping to deal with */
  94         pgoff_t                 last;           /* last page in mapping to deal with */
  95         enum {                                  /* call state */
  96                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
  97                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
  98                 AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
  99                 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
 100                 AFS_CALL_REPLYING,      /* replying to incoming call */
 101                 AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
 102                 AFS_CALL_COMPLETE,      /* successfully completed */
 103                 AFS_CALL_BUSY,          /* server was busy */
 104                 AFS_CALL_ABORTED,       /* call was aborted */
 105                 AFS_CALL_ERROR,         /* call failed due to error */
 106         }                       state;
 107         int                     error;          /* error code */
 108         unsigned                request_size;   /* size of request data */
 109         unsigned                reply_max;      /* maximum size of reply */
 110         unsigned                reply_size;     /* current size of reply */
 111         unsigned                first_offset;   /* offset into mapping[first] */
 112         unsigned                last_to;        /* amount of mapping[last] */
 113         unsigned                offset;         /* offset into received data store */
 114         unsigned char           unmarshall;     /* unmarshalling phase */
 115         bool                    incoming;       /* T if incoming call */
 116         bool                    send_pages;     /* T if data from mapping should be sent */
 117         u16                     service_id;     /* RxRPC service ID to call */
 118         __be16                  port;           /* target UDP port */
 119         __be32                  operation_ID;   /* operation ID for an incoming call */
 120         u32                     count;          /* count for use in unmarshalling */
 121         __be32                  tmp;            /* place to extract temporary data */
 122         afs_dataversion_t       store_version;  /* updated version expected from store */
 123 };
 124
 125 struct afs_call_type {
 126         const char *name;
 127
 128         /* deliver request or reply data to an call
 129          * - returning an error will cause the call to be aborted
 130          */
 131         int (*deliver)(struct afs_call *call, struct sk_buff *skb,
 132                        bool last);
 133
 134         /* map an abort code to an error number */
 135         int (*abort_to_error)(u32 abort_code);
 136
 137         /* clean up a call */
 138         void (*destructor)(struct afs_call *call);
 139 };
 140
 141 /*
 142  * record of an outstanding writeback on a vnode
 143  */
 144 struct afs_writeback {
 145         struct list_head        link;           /* link in vnode->writebacks */
 146         struct work_struct      writer;         /* work item to perform the writeback */
 147         struct afs_vnode        *vnode;         /* vnode to which this write applies */
 148         struct key              *key;           /* owner of this write */
 149         wait_queue_head_t       waitq;          /* completion and ready wait queue */
 150         pgoff_t                 first;          /* first page in batch */
 151         pgoff_t                 point;          /* last page in current store op */
 152         pgoff_t                 last;           /* last page in batch (inclusive) */
 153         unsigned                offset_first;   /* offset into first page of start of write */
 154         unsigned                to_last;        /* offset into last page of end of write */
 155         int                     num_conflicts;  /* count of conflicting writes in list */
 156         int                     usage;
 157         bool                    conflicts;      /* T if has dependent conflicts */
 158         enum {
 159                 AFS_WBACK_SYNCING,              /* synchronisation being performed */
 160                 AFS_WBACK_PENDING,              /* write pending */
 161                 AFS_WBACK_CONFLICTING,          /* conflicting writes posted */
 162                 AFS_WBACK_WRITING,              /* writing back */
 163                 AFS_WBACK_COMPLETE              /* the writeback record has been unlinked */
 164         } state __attribute__((packed));
 165 };
 166
 167 /*
 168  * AFS superblock private data
 169  * - there's one superblock per volume
 170  */
 171 struct afs_super_info {
 172         struct afs_volume       *volume;        /* volume record */
 173         char                    rwparent;       /* T if parent is R/W AFS volume */
 174 };
 175
 176 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 177 {
 178         return sb->s_fs_info;
 179 }
 180
 181 extern struct file_system_type afs_fs_type;
 182
 183 /*
 184  * entry in the cached cell catalogue
 185  */
 186 struct afs_cache_cell {
 187         char            name[AFS_MAXCELLNAME];  /* cell name (padded with NULs) */
 188         struct in_addr  vl_servers[15];         /* cached cell VL servers */
 189 };
 190
 191 /*
 192  * AFS cell record
 193  */
 194 struct afs_cell {
 195         atomic_t                usage;
 196         struct list_head        link;           /* main cell list link */
 197         struct key              *anonymous_key; /* anonymous user key for this cell */
 198         struct list_head        proc_link;      /* /proc cell list link */
 199 #ifdef CONFIG_AFS_FSCACHE
 200         struct fscache_cookie   *cache;         /* caching cookie */
 201 #endif
 202
 203         /* server record management */
 204         rwlock_t                servers_lock;   /* active server list lock */
 205         struct list_head        servers;        /* active server list */
 206
 207         /* volume location record management */
 208         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
 209         struct list_head        vl_list;        /* cell's active VL record list */
 210         spinlock_t              vl_lock;        /* vl_list lock */
 211         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
 212         unsigned short          vl_curr_svix;   /* current server index */
 213         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
 214
 215         char                    name[0];        /* cell name - must go last */
 216 };
 217
 218 /*
 219  * entry in the cached volume location catalogue
 220  */
 221 struct afs_cache_vlocation {
 222         /* volume name (lowercase, padded with NULs) */
 223         uint8_t                 name[AFS_MAXVOLNAME + 1];
 224
 225         uint8_t                 nservers;       /* number of entries used in servers[] */
 226         uint8_t                 vidmask;        /* voltype mask for vid[] */
 227         uint8_t                 srvtmask[8];    /* voltype masks for servers[] */
 228 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
 229 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
 230 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
 231
 232         afs_volid_t             vid[3];         /* volume IDs for R/W, R/O and Bak volumes */
 233         struct in_addr          servers[8];     /* fileserver addresses */
 234         time_t                  rtime;          /* last retrieval time */
 235 };
 236
 237 /*
 238  * volume -> vnode hash table entry
 239  */
 240 struct afs_cache_vhash {
 241         afs_voltype_t           vtype;          /* which volume variation */
 242         uint8_t                 hash_bucket;    /* which hash bucket this represents */
 243 } __attribute__((packed));
 244
 245 /*
 246  * AFS volume location record
 247  */
 248 struct afs_vlocation {
 249         atomic_t                usage;
 250         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 251         struct list_head        link;           /* link in cell volume location list */
 252         struct list_head        grave;          /* link in master graveyard list */
 253         struct list_head        update;         /* link in master update list */
 254         struct afs_cell         *cell;          /* cell to which volume belongs */
 255 #ifdef CONFIG_AFS_FSCACHE
 256         struct fscache_cookie   *cache;         /* caching cookie */
 257 #endif
 258         struct afs_cache_vlocation vldb;        /* volume information DB record */
 259         struct afs_volume       *vols[3];       /* volume access record pointer (index by type) */
 260         wait_queue_head_t       waitq;          /* status change waitqueue */
 261         time_t                  update_at;      /* time at which record should be updated */
 262         spinlock_t              lock;           /* access lock */
 263         afs_vlocation_state_t   state;          /* volume location state */
 264         unsigned short          upd_rej_cnt;    /* ENOMEDIUM count during update */
 265         unsigned short          upd_busy_cnt;   /* EBUSY count during update */
 266         bool                    valid;          /* T if valid */
 267 };
 268
 269 /*
 270  * AFS fileserver record
 271  */
 272 struct afs_server {
 273         atomic_t                usage;
 274         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 275         struct in_addr          addr;           /* server address */
 276         struct afs_cell         *cell;          /* cell in which server resides */
 277         struct list_head        link;           /* link in cell's server list */
 278         struct list_head        grave;          /* link in master graveyard list */
 279         struct rb_node          master_rb;      /* link in master by-addr tree */
 280         struct rw_semaphore     sem;            /* access lock */
 281
 282         /* file service access */
 283         struct rb_root          fs_vnodes;      /* vnodes backed by this server (ordered by FID) */
 284         unsigned long           fs_act_jif;     /* time at which last activity occurred */
 285         unsigned long           fs_dead_jif;    /* time at which no longer to be considered dead */
 286         spinlock_t              fs_lock;        /* access lock */
 287         int                     fs_state;       /* 0 or reason FS currently marked dead (-errno) */
 288
 289         /* callback promise management */
 290         struct rb_root          cb_promises;    /* vnode expiration list (ordered earliest first) */
 291         struct delayed_work     cb_updater;     /* callback updater */
 292         struct delayed_work     cb_break_work;  /* collected break dispatcher */
 293         wait_queue_head_t       cb_break_waitq; /* space available in cb_break waitqueue */
 294         spinlock_t              cb_lock;        /* access lock */
 295         struct afs_callback     cb_break[64];   /* ring of callbacks awaiting breaking */
 296         atomic_t                cb_break_n;     /* number of pending breaks */
 297         u8                      cb_break_head;  /* head of callback breaking ring */
 298         u8                      cb_break_tail;  /* tail of callback breaking ring */
 299 };
 300
 301 /*
 302  * AFS volume access record
 303  */
 304 struct afs_volume {
 305         atomic_t                usage;
 306         struct afs_cell         *cell;          /* cell to which belongs (unrefd ptr) */
 307         struct afs_vlocation    *vlocation;     /* volume location */
 308 #ifdef CONFIG_AFS_FSCACHE
 309         struct fscache_cookie   *cache;         /* caching cookie */
 310 #endif
 311         afs_volid_t             vid;            /* volume ID */
 312         afs_voltype_t           type;           /* type of volume */
 313         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
 314         unsigned short          nservers;       /* number of server slots filled */
 315         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
 316         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
 317         struct rw_semaphore     server_sem;     /* lock for accessing current server */
 318         struct backing_dev_info bdi;
 319 };
 320
 321 /*
 322  * vnode catalogue entry
 323  */
 324 struct afs_cache_vnode {
 325         afs_vnodeid_t           vnode_id;       /* vnode ID */
 326         unsigned                vnode_unique;   /* vnode ID uniquifier */
 327         afs_dataversion_t       data_version;   /* data version */
 328 };
 329
 330 /*
 331  * AFS inode private data
 332  */
 333 struct afs_vnode {
 334         struct inode            vfs_inode;      /* the VFS's inode record */
 335
 336         struct afs_volume       *volume;        /* volume on which vnode resides */
 337         struct afs_server       *server;        /* server currently supplying this file */
 338         struct afs_fid          fid;            /* the file identifier for this inode */
 339         struct afs_file_status  status;         /* AFS status info for this file */
 340 #ifdef CONFIG_AFS_FSCACHE
 341         struct fscache_cookie   *cache;         /* caching cookie */
 342 #endif
 343         struct afs_permits      *permits;       /* cache of permits so far obtained */
 344         struct mutex            permits_lock;   /* lock for altering permits list */
 345         struct mutex            validate_lock;  /* lock for validating this vnode */
 346         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
 347         int                     update_cnt;     /* number of outstanding ops that will update the
 348                                                  * status */
 349         spinlock_t              writeback_lock; /* lock for writebacks */
 350         spinlock_t              lock;           /* waitqueue/flags lock */
 351         unsigned long           flags;
 352 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
 353 #define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
 354 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
 355 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 356 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 357 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
 358 #define AFS_VNODE_LOCKING       6               /* set if waiting for lock on vnode */
 359 #define AFS_VNODE_READLOCKED    7               /* set if vnode is read-locked on the server */
 360 #define AFS_VNODE_WRITELOCKED   8               /* set if vnode is write-locked on the server */
 361 #define AFS_VNODE_UNLOCKING     9               /* set if vnode is being unlocked on the server */
 362 #define AFS_VNODE_AUTOCELL      10              /* set if Vnode is an auto mount point */
 363 #define AFS_VNODE_PSEUDODIR     11              /* set if Vnode is a pseudo directory */
 364
 365         long                    acl_order;      /* ACL check count (callback break count) */
 366
 367         struct list_head        writebacks;     /* alterations in pagecache that need writing */
 368         struct list_head        pending_locks;  /* locks waiting to be granted */
 369         struct list_head        granted_locks;  /* locks granted on this file */
 370         struct delayed_work     lock_work;      /* work to be done in locking */
 371         struct key              *unlock_key;    /* key to be used in unlocking */
 372
 373         /* outstanding callback notification on this file */
 374         struct rb_node          server_rb;      /* link in server->fs_vnodes */
 375         struct rb_node          cb_promise;     /* link in server->cb_promises */
 376         struct work_struct      cb_broken_work; /* work to be done on callback break */
 377         time_t                  cb_expires;     /* time at which callback expires */
 378         time_t                  cb_expires_at;  /* time used to order cb_promise */
 379         unsigned                cb_version;     /* callback version */
 380         unsigned                cb_expiry;      /* callback expiry time */
 381         afs_callback_type_t     cb_type;        /* type of callback */
 382         bool                    cb_promised;    /* true if promise still holds */
 383 };
 384
 385 /*
 386  * cached security record for one user's attempt to access a vnode
 387  */
 388 struct afs_permit {
 389         struct key              *key;           /* RxRPC ticket holding a security context */
 390         afs_access_t            access_mask;    /* access mask for this key */
 391 };
 392
 393 /*
 394  * cache of security records from attempts to access a vnode
 395  */
 396 struct afs_permits {
 397         struct rcu_head         rcu;            /* disposal procedure */
 398         int                     count;          /* number of records */
 399         struct afs_permit       permits[0];     /* the permits so far examined */
 400 };
 401
 402 /*
 403  * record of one of a system's set of network interfaces
 404  */
 405 struct afs_interface {
 406         struct in_addr  address;        /* IPv4 address bound to interface */
 407         struct in_addr  netmask;        /* netmask applied to address */
 408         unsigned        mtu;            /* MTU of interface */
 409 };
 410
 411 /*
 412  * UUID definition [internet draft]
 413  * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
 414  *   increments since midnight 15th October 1582
 415  *   - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
 416  *     time
 417  * - the clock sequence is a 14-bit counter to avoid duplicate times
 418  */
 419 struct afs_uuid {
 420         u32             time_low;                       /* low part of timestamp */
 421         u16             time_mid;                       /* mid part of timestamp */
 422         u16             time_hi_and_version;            /* high part of timestamp and version  */
 423 #define AFS_UUID_TO_UNIX_TIME   0x01b21dd213814000ULL
 424 #define AFS_UUID_TIMEHI_MASK    0x0fff
 425 #define AFS_UUID_VERSION_TIME   0x1000  /* time-based UUID */
 426 #define AFS_UUID_VERSION_NAME   0x3000  /* name-based UUID */
 427 #define AFS_UUID_VERSION_RANDOM 0x4000  /* (pseudo-)random generated UUID */
 428         u8              clock_seq_hi_and_reserved;      /* clock seq hi and variant */
 429 #define AFS_UUID_CLOCKHI_MASK   0x3f
 430 #define AFS_UUID_VARIANT_STD    0x80
 431         u8              clock_seq_low;                  /* clock seq low */
 432         u8              node[6];                        /* spatially unique node ID (MAC addr) */
 433 };
 434
 435 /*****************************************************************************/
 436 /*
 437  * cache.c
 438  */
 439 #ifdef CONFIG_AFS_FSCACHE
 440 extern struct fscache_netfs afs_cache_netfs;
 441 extern struct fscache_cookie_def afs_cell_cache_index_def;
 442 extern struct fscache_cookie_def afs_vlocation_cache_index_def;
 443 extern struct fscache_cookie_def afs_volume_cache_index_def;
 444 extern struct fscache_cookie_def afs_vnode_cache_index_def;
 445 #else
 446 #define afs_cell_cache_index_def        (*(struct fscache_cookie_def *) NULL)
 447 #define afs_vlocation_cache_index_def   (*(struct fscache_cookie_def *) NULL)
 448 #define afs_volume_cache_index_def      (*(struct fscache_cookie_def *) NULL)
 449 #define afs_vnode_cache_index_def       (*(struct fscache_cookie_def *) NULL)
 450 #endif
 451
 452 /*
 453  * callback.c
 454  */
 455 extern void afs_init_callback_state(struct afs_server *);
 456 extern void afs_broken_callback_work(struct work_struct *);
 457 extern void afs_break_callbacks(struct afs_server *, size_t,
 458                                 struct afs_callback[]);
 459 extern void afs_discard_callback_on_delete(struct afs_vnode *);
 460 extern void afs_give_up_callback(struct afs_vnode *);
 461 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 462 extern void afs_flush_callback_breaks(struct afs_server *);
 463 extern int __init afs_callback_update_init(void);
 464 extern void afs_callback_update_kill(void);
 465
 466 /*
 467  * cell.c
 468  */
 469 extern struct rw_semaphore afs_proc_cells_sem;
 470 extern struct list_head afs_proc_cells;
 471
 472 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
 473 extern int afs_cell_init(char *);
 474 extern struct afs_cell *afs_cell_create(const char *, unsigned, char *, bool);
 475 extern struct afs_cell *afs_cell_lookup(const char *, unsigned, bool);
 476 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
 477 extern void afs_put_cell(struct afs_cell *);
 478 extern void afs_cell_purge(void);
 479
 480 /*
 481  * cmservice.c
 482  */
 483 extern bool afs_cm_incoming_call(struct afs_call *);
 484
 485 /*
 486  * dir.c
 487  */
 488 extern const struct inode_operations afs_dir_inode_operations;
 489 extern const struct dentry_operations afs_fs_dentry_operations;
 490 extern const struct file_operations afs_dir_file_operations;
 491
 492 /*
 493  * file.c
 494  */
 495 extern const struct address_space_operations afs_fs_aops;
 496 extern const struct inode_operations afs_file_inode_operations;
 497 extern const struct file_operations afs_file_operations;
 498
 499 extern int afs_open(struct inode *, struct file *);
 500 extern int afs_release(struct inode *, struct file *);
 501 extern int afs_page_filler(void *, struct page *);
 502
 503 /*
 504  * flock.c
 505  */
 506 extern void __exit afs_kill_lock_manager(void);
 507 extern void afs_lock_work(struct work_struct *);
 508 extern void afs_lock_may_be_available(struct afs_vnode *);
 509 extern int afs_lock(struct file *, int, struct file_lock *);
 510 extern int afs_flock(struct file *, int, struct file_lock *);
 511
 512 /*
 513  * fsclient.c
 514  */
 515 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
 516                                     struct afs_vnode *, struct afs_volsync *,
 517                                     const struct afs_wait_mode *);
 518 extern int afs_fs_give_up_callbacks(struct afs_server *,
 519                                     const struct afs_wait_mode *);
 520 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
 521                              struct afs_vnode *, off_t, size_t, struct page *,
 522                              const struct afs_wait_mode *);
 523 extern int afs_fs_create(struct afs_server *, struct key *,
 524                          struct afs_vnode *, const char *, umode_t,
 525                          struct afs_fid *, struct afs_file_status *,
 526                          struct afs_callback *,
 527                          const struct afs_wait_mode *);
 528 extern int afs_fs_remove(struct afs_server *, struct key *,
 529                          struct afs_vnode *, const char *, bool,
 530                          const struct afs_wait_mode *);
 531 extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
 532                        struct afs_vnode *, const char *,
 533                        const struct afs_wait_mode *);
 534 extern int afs_fs_symlink(struct afs_server *, struct key *,
 535                           struct afs_vnode *, const char *, const char *,
 536                           struct afs_fid *, struct afs_file_status *,
 537                           const struct afs_wait_mode *);
 538 extern int afs_fs_rename(struct afs_server *, struct key *,
 539                          struct afs_vnode *, const char *,
 540                          struct afs_vnode *, const char *,
 541                          const struct afs_wait_mode *);
 542 extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
 543                              pgoff_t, pgoff_t, unsigned, unsigned,
 544                              const struct afs_wait_mode *);
 545 extern int afs_fs_setattr(struct afs_server *, struct key *,
 546                           struct afs_vnode *, struct iattr *,
 547                           const struct afs_wait_mode *);
 548 extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
 549                                     struct afs_vnode *,
 550                                     struct afs_volume_status *,
 551                                     const struct afs_wait_mode *);
 552 extern int afs_fs_set_lock(struct afs_server *, struct key *,
 553                            struct afs_vnode *, afs_lock_type_t,
 554                            const struct afs_wait_mode *);
 555 extern int afs_fs_extend_lock(struct afs_server *, struct key *,
 556                               struct afs_vnode *,
 557                               const struct afs_wait_mode *);
 558 extern int afs_fs_release_lock(struct afs_server *, struct key *,
 559                                struct afs_vnode *,
 560                                const struct afs_wait_mode *);
 561
 562 /*
 563  * inode.c
 564  */
 565 extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
 566                                        struct key *);
 567 extern struct inode *afs_iget(struct super_block *, struct key *,
 568                               struct afs_fid *, struct afs_file_status *,
 569                               struct afs_callback *);
 570 extern void afs_zap_data(struct afs_vnode *);
 571 extern int afs_validate(struct afs_vnode *, struct key *);
 572 extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 573 extern int afs_setattr(struct dentry *, struct iattr *);
 574 extern void afs_evict_inode(struct inode *);
 575 extern int afs_drop_inode(struct inode *);
 576
 577 /*
 578  * main.c
 579  */
 580 extern struct workqueue_struct *afs_wq;
 581 extern struct afs_uuid afs_uuid;
 582
 583 /*
 584  * misc.c
 585  */
 586 extern int afs_abort_to_error(u32);
 587
 588 /*
 589  * mntpt.c
 590  */
 591 extern const struct inode_operations afs_mntpt_inode_operations;
 592 extern const struct inode_operations afs_autocell_inode_operations;
 593 extern const struct file_operations afs_mntpt_file_operations;
 594
 595 extern struct vfsmount *afs_d_automount(struct path *);
 596 extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
 597 extern void afs_mntpt_kill_timer(void);
 598
 599 /*
 600  * proc.c
 601  */
 602 extern int afs_proc_init(void);
 603 extern void afs_proc_cleanup(void);
 604 extern int afs_proc_cell_setup(struct afs_cell *);
 605 extern void afs_proc_cell_remove(struct afs_cell *);
 606
 607 /*
 608  * rxrpc.c
 609  */
 610 extern int afs_open_socket(void);
 611 extern void afs_close_socket(void);
 612 extern void afs_data_consumed(struct afs_call *, struct sk_buff *);
 613 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
 614                          const struct afs_wait_mode *);
 615 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 616                                             size_t, size_t);
 617 extern void afs_flat_call_destructor(struct afs_call *);
 618 extern int afs_transfer_reply(struct afs_call *, struct sk_buff *, bool);
 619 extern void afs_send_empty_reply(struct afs_call *);
 620 extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
 621 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 622                             size_t);
 623
 624 static inline int afs_data_complete(struct afs_call *call, struct sk_buff *skb,
 625                                     bool last)
 626 {
 627         if (skb->len > 0)
 628                 return -EBADMSG;
 629         afs_data_consumed(call, skb);
 630         if (!last)
 631                 return -EAGAIN;
 632         return 0;
 633 }
 634
 635 /*
 636  * security.c
 637  */
 638 extern void afs_clear_permits(struct afs_vnode *);
 639 extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
 640 extern void afs_zap_permits(struct rcu_head *);
 641 extern struct key *afs_request_key(struct afs_cell *);
 642 extern int afs_permission(struct inode *, int);
 643
 644 /*
 645  * server.c
 646  */
 647 extern spinlock_t afs_server_peer_lock;
 648
 649 #define afs_get_server(S)                                       \
 650 do {                                                            \
 651         _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
 652         atomic_inc(&(S)->usage);                                \
 653 } while(0)
 654
 655 extern struct afs_server *afs_lookup_server(struct afs_cell *,
 656                                             const struct in_addr *);
 657 extern struct afs_server *afs_find_server(const struct in_addr *);
 658 extern void afs_put_server(struct afs_server *);
 659 extern void __exit afs_purge_servers(void);
 660
 661 /*
 662  * super.c
 663  */
 664 extern int afs_fs_init(void);
 665 extern void afs_fs_exit(void);
 666
 667 /*
 668  * use-rtnetlink.c
 669  */
 670 extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
 671 extern int afs_get_MAC_address(u8 *, size_t);
 672
 673 /*
 674  * vlclient.c
 675  */
 676 extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
 677                                     const char *, struct afs_cache_vlocation *,
 678                                     const struct afs_wait_mode *);
 679 extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
 680                                   afs_volid_t, afs_voltype_t,
 681                                   struct afs_cache_vlocation *,
 682                                   const struct afs_wait_mode *);
 683
 684 /*
 685  * vlocation.c
 686  */
 687 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
 688
 689 extern int __init afs_vlocation_update_init(void);
 690 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
 691                                                   struct key *,
 692                                                   const char *, size_t);
 693 extern void afs_put_vlocation(struct afs_vlocation *);
 694 extern void afs_vlocation_purge(void);
 695
 696 /*
 697  * vnode.c
 698  */
 699 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
 700 {
 701         return container_of(inode, struct afs_vnode, vfs_inode);
 702 }
 703
 704 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 705 {
 706         return &vnode->vfs_inode;
 707 }
 708
 709 extern void afs_vnode_finalise_status_update(struct afs_vnode *,
 710                                              struct afs_server *);
 711 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
 712                                   struct key *);
 713 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
 714                                 off_t, size_t, struct page *);
 715 extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
 716                             umode_t, struct afs_fid *, struct afs_file_status *,
 717                             struct afs_callback *, struct afs_server **);
 718 extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
 719                             bool);
 720 extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
 721                           const char *);
 722 extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
 723                              const char *, struct afs_fid *,
 724                              struct afs_file_status *, struct afs_server **);
 725 extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
 726                             struct key *, const char *, const char *);
 727 extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
 728                                 unsigned, unsigned);
 729 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
 730 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
 731                                        struct afs_volume_status *);
 732 extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
 733                               afs_lock_type_t);
 734 extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
 735 extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
 736
 737 /*
 738  * volume.c
 739  */
 740 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
 741
 742 extern void afs_put_volume(struct afs_volume *);
 743 extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
 744 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
 745 extern int afs_volume_release_fileserver(struct afs_vnode *,
 746                                          struct afs_server *, int);
 747
 748 /*
 749  * write.c
 750  */
 751 extern int afs_set_page_dirty(struct page *);
 752 extern void afs_put_writeback(struct afs_writeback *);
 753 extern int afs_write_begin(struct file *file, struct address_space *mapping,
 754                         loff_t pos, unsigned len, unsigned flags,
 755                         struct page **pagep, void **fsdata);
 756 extern int afs_write_end(struct file *file, struct address_space *mapping,
 757                         loff_t pos, unsigned len, unsigned copied,
 758                         struct page *page, void *fsdata);
 759 extern int afs_writepage(struct page *, struct writeback_control *);
 760 extern int afs_writepages(struct address_space *, struct writeback_control *);
 761 extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 762 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
 763 extern int afs_writeback_all(struct afs_vnode *);
 764 extern int afs_fsync(struct file *, loff_t, loff_t, int);
 765
 766
 767 /*****************************************************************************/
 768 /*
 769  * debug tracing
 770  */
 771 extern unsigned afs_debug;
 772
 773 #define dbgprintk(FMT,...) \
 774         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 775
 776 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 777 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 778 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 779
 780
 781 #if defined(__KDEBUG)
 782 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 783 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 784 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 785
 786 #elif defined(CONFIG_AFS_DEBUG)
 787 #define AFS_DEBUG_KENTER        0x01
 788 #define AFS_DEBUG_KLEAVE        0x02
 789 #define AFS_DEBUG_KDEBUG        0x04
 790
 791 #define _enter(FMT,...)                                 \
 792 do {                                                    \
 793         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
 794                 kenter(FMT,##__VA_ARGS__);              \
 795 } while (0)
 796
 797 #define _leave(FMT,...)                                 \
 798 do {                                                    \
 799         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
 800                 kleave(FMT,##__VA_ARGS__);              \
 801 } while (0)
 802
 803 #define _debug(FMT,...)                                 \
 804 do {                                                    \
 805         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
 806                 kdebug(FMT,##__VA_ARGS__);              \
 807 } while (0)
 808
 809 #else
 810 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 811 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 812 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 813 #endif
 814
 815 /*
 816  * debug assertion checking
 817  */
 818 #if 1 // defined(__KDEBUGALL)
 819
 820 #define ASSERT(X)                                               \
 821 do {                                                            \
 822         if (unlikely(!(X))) {                                   \
 823                 printk(KERN_ERR "\n");                          \
 824                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 825                 BUG();                                          \
 826         }                                                       \
 827 } while(0)
 828
 829 #define ASSERTCMP(X, OP, Y)                                             \
 830 do {                                                                    \
 831         if (unlikely(!((X) OP (Y)))) {                                  \
 832                 printk(KERN_ERR "\n");                                  \
 833                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 834                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 835                        (unsigned long)(X), (unsigned long)(Y));         \
 836                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 837                        (unsigned long)(X), (unsigned long)(Y));         \
 838                 BUG();                                                  \
 839         }                                                               \
 840 } while(0)
 841
 842 #define ASSERTRANGE(L, OP1, N, OP2, H)                                  \
 843 do {                                                                    \
 844         if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {               \
 845                 printk(KERN_ERR "\n");                                  \
 846                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 847                 printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
 848                        (unsigned long)(L), (unsigned long)(N),          \
 849                        (unsigned long)(H));                             \
 850                 printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
 851                        (unsigned long)(L), (unsigned long)(N),          \
 852                        (unsigned long)(H));                             \
 853                 BUG();                                                  \
 854         }                                                               \
 855 } while(0)
 856
 857 #define ASSERTIF(C, X)                                          \
 858 do {                                                            \
 859         if (unlikely((C) && !(X))) {                            \
 860                 printk(KERN_ERR "\n");                          \
 861                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 862                 BUG();                                          \
 863         }                                                       \
 864 } while(0)
 865
 866 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 867 do {                                                                    \
 868         if (unlikely((C) && !((X) OP (Y)))) {                           \
 869                 printk(KERN_ERR "\n");                                  \
 870                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 871                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 872                        (unsigned long)(X), (unsigned long)(Y));         \
 873                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 874                        (unsigned long)(X), (unsigned long)(Y));         \
 875                 BUG();                                                  \
 876         }                                                               \
 877 } while(0)
 878
 879 #else
 880
 881 #define ASSERT(X)                               \
 882 do {                                            \
 883 } while(0)
 884
 885 #define ASSERTCMP(X, OP, Y)                     \
 886 do {                                            \
 887 } while(0)
 888
 889 #define ASSERTRANGE(L, OP1, N, OP2, H)          \
 890 do {                                            \
 891 } while(0)
 892
 893 #define ASSERTIF(C, X)                          \
 894 do {                                            \
 895 } while(0)
 896
 897 #define ASSERTIFCMP(C, X, OP, Y)                \
 898 do {                                            \
 899 } while(0)
 900
 901 #endif /* __KDEBUGALL */