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 "afs.h"
  19 #include "afs_vl.h"
  20
  21 #define AFS_CELL_MAX_ADDRS 15
  22
  23 struct afs_call;
  24
  25 typedef enum {
  26         AFS_VL_NEW,                     /* new, uninitialised record */
  27         AFS_VL_CREATING,                /* creating record */
  28         AFS_VL_VALID,                   /* record is pending */
  29         AFS_VL_NO_VOLUME,               /* no such volume available */
  30         AFS_VL_UPDATING,                /* update in progress */
  31         AFS_VL_VOLUME_DELETED,          /* volume was deleted */
  32         AFS_VL_UNCERTAIN,               /* uncertain state (update failed) */
  33 } __attribute__((packed)) afs_vlocation_state_t;
  34
  35 /*
  36  * definition of how to wait for the completion of an operation
  37  */
  38 struct afs_wait_mode {
  39         /* RxRPC received message notification */
  40         void (*rx_wakeup)(struct afs_call *call);
  41
  42         /* synchronous call waiter and call dispatched notification */
  43         int (*wait)(struct afs_call *call);
  44
  45         /* asynchronous call completion */
  46         void (*async_complete)(void *reply, int error);
  47 };
  48
  49 extern const struct afs_wait_mode afs_sync_call;
  50 extern const struct afs_wait_mode afs_async_call;
  51
  52 /*
  53  * a record of an in-progress RxRPC call
  54  */
  55 struct afs_call {
  56         const struct afs_call_type *type;       /* type of call */
  57         const struct afs_wait_mode *wait_mode;  /* completion wait mode */
  58         wait_queue_head_t       waitq;          /* processes awaiting completion */
  59         struct work_struct      async_work;     /* asynchronous work processor */
  60         struct work_struct      work;           /* actual work processor */
  61         struct sk_buff_head     rx_queue;       /* received packets */
  62         struct rxrpc_call       *rxcall;        /* RxRPC call handle */
  63         struct key              *key;           /* security for this call */
  64         struct afs_server       *server;        /* server affected by incoming CM call */
  65         void                    *request;       /* request data (first part) */
  66         void                    *request2;      /* request data (second part) */
  67         void                    *buffer;        /* reply receive buffer */
  68         void                    *reply;         /* reply buffer (first part) */
  69         void                    *reply2;        /* reply buffer (second part) */
  70         void                    *reply3;        /* reply buffer (third part) */
  71         enum {                                  /* call state */
  72                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
  73                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
  74                 AFS_CALL_AWAIT_OP_ID,   /* awaiting op ID on incoming call */
  75                 AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
  76                 AFS_CALL_REPLYING,      /* replying to incoming call */
  77                 AFS_CALL_AWAIT_ACK,     /* awaiting final ACK of incoming call */
  78                 AFS_CALL_COMPLETE,      /* successfully completed */
  79                 AFS_CALL_BUSY,          /* server was busy */
  80                 AFS_CALL_ABORTED,       /* call was aborted */
  81                 AFS_CALL_ERROR,         /* call failed due to error */
  82         }                       state;
  83         int                     error;          /* error code */
  84         unsigned                request_size;   /* size of request data */
  85         unsigned                reply_max;      /* maximum size of reply */
  86         unsigned                reply_size;     /* current size of reply */
  87         unsigned short          offset;         /* offset into received data store */
  88         unsigned char           unmarshall;     /* unmarshalling phase */
  89         bool                    incoming;       /* T if incoming call */
  90         u16                     service_id;     /* RxRPC service ID to call */
  91         __be16                  port;           /* target UDP port */
  92         __be32                  operation_ID;   /* operation ID for an incoming call */
  93         u32                     count;          /* count for use in unmarshalling */
  94         __be32                  tmp;            /* place to extract temporary data */
  95 };
  96
  97 struct afs_call_type {
  98         /* deliver request or reply data to an call
  99          * - returning an error will cause the call to be aborted
 100          */
 101         int (*deliver)(struct afs_call *call, struct sk_buff *skb,
 102                        bool last);
 103
 104         /* map an abort code to an error number */
 105         int (*abort_to_error)(u32 abort_code);
 106
 107         /* clean up a call */
 108         void (*destructor)(struct afs_call *call);
 109 };
 110
 111 /*
 112  * AFS superblock private data
 113  * - there's one superblock per volume
 114  */
 115 struct afs_super_info {
 116         struct afs_volume       *volume;        /* volume record */
 117         char                    rwparent;       /* T if parent is R/W AFS volume */
 118 };
 119
 120 static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
 121 {
 122         return sb->s_fs_info;
 123 }
 124
 125 extern struct file_system_type afs_fs_type;
 126
 127 /*
 128  * entry in the cached cell catalogue
 129  */
 130 struct afs_cache_cell {
 131         char                    name[64];       /* cell name (padded with NULs) */
 132         struct in_addr          vl_servers[15]; /* cached cell VL servers */
 133 };
 134
 135 /*
 136  * AFS cell record
 137  */
 138 struct afs_cell {
 139         atomic_t                usage;
 140         struct list_head        link;           /* main cell list link */
 141         struct list_head        proc_link;      /* /proc cell list link */
 142         struct proc_dir_entry   *proc_dir;      /* /proc dir for this cell */
 143 #ifdef AFS_CACHING_SUPPORT
 144         struct cachefs_cookie   *cache;         /* caching cookie */
 145 #endif
 146
 147         /* server record management */
 148         rwlock_t                servers_lock;   /* active server list lock */
 149         struct list_head        servers;        /* active server list */
 150
 151         /* volume location record management */
 152         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
 153         struct list_head        vl_list;        /* cell's active VL record list */
 154         spinlock_t              vl_lock;        /* vl_list lock */
 155         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
 156         unsigned short          vl_curr_svix;   /* current server index */
 157         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
 158
 159         char                    name[0];        /* cell name - must go last */
 160 };
 161
 162 /*
 163  * entry in the cached volume location catalogue
 164  */
 165 struct afs_cache_vlocation {
 166         uint8_t                 name[64 + 1];   /* volume name (lowercase, padded with NULs) */
 167         uint8_t                 nservers;       /* number of entries used in servers[] */
 168         uint8_t                 vidmask;        /* voltype mask for vid[] */
 169         uint8_t                 srvtmask[8];    /* voltype masks for servers[] */
 170 #define AFS_VOL_VTM_RW  0x01 /* R/W version of the volume is available (on this server) */
 171 #define AFS_VOL_VTM_RO  0x02 /* R/O version of the volume is available (on this server) */
 172 #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
 173
 174         afs_volid_t             vid[3];         /* volume IDs for R/W, R/O and Bak volumes */
 175         struct in_addr          servers[8];     /* fileserver addresses */
 176         time_t                  rtime;          /* last retrieval time */
 177 };
 178
 179 /*
 180  * volume -> vnode hash table entry
 181  */
 182 struct afs_cache_vhash {
 183         afs_voltype_t           vtype;          /* which volume variation */
 184         uint8_t                 hash_bucket;    /* which hash bucket this represents */
 185 } __attribute__((packed));
 186
 187 /*
 188  * AFS volume location record
 189  */
 190 struct afs_vlocation {
 191         atomic_t                usage;
 192         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 193         struct list_head        link;           /* link in cell volume location list */
 194         struct list_head        grave;          /* link in master graveyard list */
 195         struct list_head        update;         /* link in master update list */
 196         struct afs_cell         *cell;          /* cell to which volume belongs */
 197 #ifdef AFS_CACHING_SUPPORT
 198         struct cachefs_cookie   *cache;         /* caching cookie */
 199 #endif
 200         struct afs_cache_vlocation vldb;        /* volume information DB record */
 201         struct afs_volume       *vols[3];       /* volume access record pointer (index by type) */
 202         wait_queue_head_t       waitq;          /* status change waitqueue */
 203         time_t                  update_at;      /* time at which record should be updated */
 204         rwlock_t                lock;           /* access lock */
 205         afs_vlocation_state_t   state;          /* volume location state */
 206         unsigned short          upd_rej_cnt;    /* ENOMEDIUM count during update */
 207         unsigned short          upd_busy_cnt;   /* EBUSY count during update */
 208         bool                    valid;          /* T if valid */
 209 };
 210
 211 /*
 212  * AFS fileserver record
 213  */
 214 struct afs_server {
 215         atomic_t                usage;
 216         time_t                  time_of_death;  /* time at which put reduced usage to 0 */
 217         struct in_addr          addr;           /* server address */
 218         struct afs_cell         *cell;          /* cell in which server resides */
 219         struct list_head        link;           /* link in cell's server list */
 220         struct list_head        grave;          /* link in master graveyard list */
 221         struct rb_node          master_rb;      /* link in master by-addr tree */
 222         struct rw_semaphore     sem;            /* access lock */
 223
 224         /* file service access */
 225         struct rb_root          fs_vnodes;      /* vnodes backed by this server (ordered by FID) */
 226         unsigned long           fs_act_jif;     /* time at which last activity occurred */
 227         unsigned long           fs_dead_jif;    /* time at which no longer to be considered dead */
 228         spinlock_t              fs_lock;        /* access lock */
 229         int                     fs_state;       /* 0 or reason FS currently marked dead (-errno) */
 230
 231         /* callback promise management */
 232         struct rb_root          cb_promises;    /* vnode expiration list (ordered earliest first) */
 233         struct delayed_work     cb_updater;     /* callback updater */
 234         struct delayed_work     cb_break_work;  /* collected break dispatcher */
 235         wait_queue_head_t       cb_break_waitq; /* space available in cb_break waitqueue */
 236         spinlock_t              cb_lock;        /* access lock */
 237         struct afs_callback     cb_break[64];   /* ring of callbacks awaiting breaking */
 238         atomic_t                cb_break_n;     /* number of pending breaks */
 239         u8                      cb_break_head;  /* head of callback breaking ring */
 240         u8                      cb_break_tail;  /* tail of callback breaking ring */
 241 };
 242
 243 /*
 244  * AFS volume access record
 245  */
 246 struct afs_volume {
 247         atomic_t                usage;
 248         struct afs_cell         *cell;          /* cell to which belongs (unrefd ptr) */
 249         struct afs_vlocation    *vlocation;     /* volume location */
 250 #ifdef AFS_CACHING_SUPPORT
 251         struct cachefs_cookie   *cache;         /* caching cookie */
 252 #endif
 253         afs_volid_t             vid;            /* volume ID */
 254         afs_voltype_t           type;           /* type of volume */
 255         char                    type_force;     /* force volume type (suppress R/O -> R/W) */
 256         unsigned short          nservers;       /* number of server slots filled */
 257         unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
 258         struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
 259         struct rw_semaphore     server_sem;     /* lock for accessing current server */
 260 };
 261
 262 /*
 263  * vnode catalogue entry
 264  */
 265 struct afs_cache_vnode {
 266         afs_vnodeid_t           vnode_id;       /* vnode ID */
 267         unsigned                vnode_unique;   /* vnode ID uniquifier */
 268         afs_dataversion_t       data_version;   /* data version */
 269 };
 270
 271 /*
 272  * AFS inode private data
 273  */
 274 struct afs_vnode {
 275         struct inode            vfs_inode;      /* the VFS's inode record */
 276
 277         struct afs_volume       *volume;        /* volume on which vnode resides */
 278         struct afs_server       *server;        /* server currently supplying this file */
 279         struct afs_fid          fid;            /* the file identifier for this inode */
 280         struct afs_file_status  status;         /* AFS status info for this file */
 281 #ifdef AFS_CACHING_SUPPORT
 282         struct cachefs_cookie   *cache;         /* caching cookie */
 283 #endif
 284
 285         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
 286         unsigned                update_cnt;     /* number of outstanding ops that will update the
 287                                                  * status */
 288         spinlock_t              lock;           /* waitqueue/flags lock */
 289         unsigned long           flags;
 290 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
 291 #define AFS_VNODE_CHANGED       1               /* set if vnode's metadata changed */
 292 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
 293 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 294 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 295 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
 296 #define AFS_VNODE_DIR_CHANGED   6               /* set if vnode's parent dir metadata changed */
 297 #define AFS_VNODE_DIR_MODIFIED  7               /* set if vnode's parent dir data modified */
 298
 299         /* outstanding callback notification on this file */
 300         struct rb_node          server_rb;      /* link in server->fs_vnodes */
 301         struct rb_node          cb_promise;     /* link in server->cb_promises */
 302         struct work_struct      cb_broken_work; /* work to be done on callback break */
 303         struct mutex            cb_broken_lock; /* lock against multiple attempts to fix break */
 304 //      struct list_head        cb_hash_link;   /* link in master callback hash */
 305         time_t                  cb_expires;     /* time at which callback expires */
 306         time_t                  cb_expires_at;  /* time used to order cb_promise */
 307         unsigned                cb_version;     /* callback version */
 308         unsigned                cb_expiry;      /* callback expiry time */
 309         afs_callback_type_t     cb_type;        /* type of callback */
 310         bool                    cb_promised;    /* true if promise still holds */
 311 };
 312
 313 /*****************************************************************************/
 314 /*
 315  * callback.c
 316  */
 317 extern void afs_init_callback_state(struct afs_server *);
 318 extern void afs_broken_callback_work(struct work_struct *);
 319 extern void afs_break_callbacks(struct afs_server *, size_t,
 320                                 struct afs_callback[]);
 321 extern void afs_give_up_callback(struct afs_vnode *);
 322 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 323 extern void afs_flush_callback_breaks(struct afs_server *);
 324 extern int __init afs_callback_update_init(void);
 325 extern void __exit afs_callback_update_kill(void);
 326
 327 /*
 328  * cell.c
 329  */
 330 extern struct rw_semaphore afs_proc_cells_sem;
 331 extern struct list_head afs_proc_cells;
 332 #ifdef AFS_CACHING_SUPPORT
 333 extern struct cachefs_index_def afs_cache_cell_index_def;
 334 #endif
 335
 336 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
 337 extern int afs_cell_init(char *);
 338 extern struct afs_cell *afs_cell_create(const char *, char *);
 339 extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
 340 extern struct afs_cell *afs_grab_cell(struct afs_cell *);
 341 extern void afs_put_cell(struct afs_cell *);
 342 extern void afs_cell_purge(void);
 343
 344 /*
 345  * cmservice.c
 346  */
 347 extern bool afs_cm_incoming_call(struct afs_call *);
 348
 349 /*
 350  * dir.c
 351  */
 352 extern const struct inode_operations afs_dir_inode_operations;
 353 extern const struct file_operations afs_dir_file_operations;
 354
 355 /*
 356  * file.c
 357  */
 358 extern const struct address_space_operations afs_fs_aops;
 359 extern const struct inode_operations afs_file_inode_operations;
 360
 361 #ifdef AFS_CACHING_SUPPORT
 362 extern int afs_cache_get_page_cookie(struct page *, struct cachefs_page **);
 363 #endif
 364
 365 /*
 366  * fsclient.c
 367  */
 368 extern int afs_fs_fetch_file_status(struct afs_server *,
 369                                     struct afs_vnode *,
 370                                     struct afs_volsync *,
 371                                     const struct afs_wait_mode *);
 372 extern int afs_fs_give_up_callbacks(struct afs_server *,
 373                                     const struct afs_wait_mode *);
 374 extern int afs_fs_fetch_data(struct afs_server *, struct afs_vnode *, off_t,
 375                              size_t, struct page *, struct afs_volsync *,
 376                              const struct afs_wait_mode *);
 377
 378 /*
 379  * inode.c
 380  */
 381 extern struct inode *afs_iget(struct super_block *, struct afs_fid *);
 382 extern int afs_inode_getattr(struct vfsmount *, struct dentry *,
 383                              struct kstat *);
 384 extern void afs_clear_inode(struct inode *);
 385
 386 /*
 387  * main.c
 388  */
 389 #ifdef AFS_CACHING_SUPPORT
 390 extern struct cachefs_netfs afs_cache_netfs;
 391 #endif
 392
 393 /*
 394  * misc.c
 395  */
 396 extern int afs_abort_to_error(u32);
 397
 398 /*
 399  * mntpt.c
 400  */
 401 extern const struct inode_operations afs_mntpt_inode_operations;
 402 extern const struct file_operations afs_mntpt_file_operations;
 403 extern unsigned long afs_mntpt_expiry_timeout;
 404
 405 extern int afs_mntpt_check_symlink(struct afs_vnode *);
 406 extern void afs_mntpt_kill_timer(void);
 407 extern void afs_umount_begin(struct vfsmount *, int);
 408
 409 /*
 410  * super.c
 411  */
 412 extern int afs_fs_init(void);
 413 extern void afs_fs_exit(void);
 414
 415 /*
 416  * proc.c
 417  */
 418 extern int afs_proc_init(void);
 419 extern void afs_proc_cleanup(void);
 420 extern int afs_proc_cell_setup(struct afs_cell *);
 421 extern void afs_proc_cell_remove(struct afs_cell *);
 422
 423 /*
 424  * rxrpc.c
 425  */
 426 extern int afs_open_socket(void);
 427 extern void afs_close_socket(void);
 428 extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
 429                          const struct afs_wait_mode *);
 430 extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
 431                                             size_t, size_t);
 432 extern void afs_flat_call_destructor(struct afs_call *);
 433 extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
 434 extern void afs_send_empty_reply(struct afs_call *);
 435 extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
 436                             size_t);
 437
 438 /*
 439  * server.c
 440  */
 441 extern spinlock_t afs_server_peer_lock;
 442
 443 #define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
 444
 445 extern struct afs_server *afs_lookup_server(struct afs_cell *,
 446                                             const struct in_addr *);
 447 extern struct afs_server *afs_find_server(const struct in_addr *);
 448 extern void afs_put_server(struct afs_server *);
 449 extern void __exit afs_purge_servers(void);
 450
 451 /*
 452  * vlclient.c
 453  */
 454 #ifdef AFS_CACHING_SUPPORT
 455 extern struct cachefs_index_def afs_vlocation_cache_index_def;
 456 #endif
 457
 458 extern int afs_vl_get_entry_by_name(struct in_addr *, const char *,
 459                                     struct afs_cache_vlocation *,
 460                                     const struct afs_wait_mode *);
 461 extern int afs_vl_get_entry_by_id(struct in_addr *, afs_volid_t, afs_voltype_t,
 462                                   struct afs_cache_vlocation *,
 463                                   const struct afs_wait_mode *);
 464
 465 /*
 466  * vlocation.c
 467  */
 468 #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
 469
 470 extern int __init afs_vlocation_update_init(void);
 471 extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
 472                                                   const char *, size_t);
 473 extern void afs_put_vlocation(struct afs_vlocation *);
 474 extern void __exit afs_vlocation_purge(void);
 475
 476 /*
 477  * vnode.c
 478  */
 479 #ifdef AFS_CACHING_SUPPORT
 480 extern struct cachefs_index_def afs_vnode_cache_index_def;
 481 #endif
 482
 483 extern struct afs_timer_ops afs_vnode_cb_timed_out_ops;
 484
 485 static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
 486 {
 487         return container_of(inode, struct afs_vnode, vfs_inode);
 488 }
 489
 490 static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
 491 {
 492         return &vnode->vfs_inode;
 493 }
 494
 495 extern int afs_vnode_fetch_status(struct afs_vnode *);
 496 extern int afs_vnode_fetch_data(struct afs_vnode *vnode, off_t, size_t,
 497                                 struct page *);
 498
 499 /*
 500  * volume.c
 501  */
 502 #ifdef AFS_CACHING_SUPPORT
 503 extern struct cachefs_index_def afs_volume_cache_index_def;
 504 #endif
 505
 506 #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
 507
 508 extern void afs_put_volume(struct afs_volume *);
 509 extern struct afs_volume *afs_volume_lookup(const char *, struct afs_cell *,
 510                                             int);
 511 extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
 512 extern int afs_volume_release_fileserver(struct afs_vnode *,
 513                                          struct afs_server *, int);
 514
 515 /*****************************************************************************/
 516 /*
 517  * debug tracing
 518  */
 519 extern unsigned afs_debug;
 520
 521 #define dbgprintk(FMT,...) \
 522         printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__)
 523
 524 /* make sure we maintain the format strings, even when debugging is disabled */
 525 static inline __attribute__((format(printf,1,2)))
 526 void _dbprintk(const char *fmt, ...)
 527 {
 528 }
 529
 530 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
 531 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
 532 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 533
 534
 535 #if defined(__KDEBUG)
 536 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 537 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 538 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 539
 540 #elif defined(CONFIG_AFS_DEBUG)
 541 #define AFS_DEBUG_KENTER        0x01
 542 #define AFS_DEBUG_KLEAVE        0x02
 543 #define AFS_DEBUG_KDEBUG        0x04
 544
 545 #define _enter(FMT,...)                                 \
 546 do {                                                    \
 547         if (unlikely(afs_debug & AFS_DEBUG_KENTER))     \
 548                 kenter(FMT,##__VA_ARGS__);              \
 549 } while (0)
 550
 551 #define _leave(FMT,...)                                 \
 552 do {                                                    \
 553         if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))     \
 554                 kleave(FMT,##__VA_ARGS__);              \
 555 } while (0)
 556
 557 #define _debug(FMT,...)                                 \
 558 do {                                                    \
 559         if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))     \
 560                 kdebug(FMT,##__VA_ARGS__);              \
 561 } while (0)
 562
 563 #else
 564 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
 565 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
 566 #define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
 567 #endif
 568
 569 /*
 570  * debug assertion checking
 571  */
 572 #if 1 // defined(__KDEBUGALL)
 573
 574 #define ASSERT(X)                                               \
 575 do {                                                            \
 576         if (unlikely(!(X))) {                                   \
 577                 printk(KERN_ERR "\n");                          \
 578                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 579                 BUG();                                          \
 580         }                                                       \
 581 } while(0)
 582
 583 #define ASSERTCMP(X, OP, Y)                                             \
 584 do {                                                                    \
 585         if (unlikely(!((X) OP (Y)))) {                                  \
 586                 printk(KERN_ERR "\n");                                  \
 587                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 588                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 589                        (unsigned long)(X), (unsigned long)(Y));         \
 590                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 591                        (unsigned long)(X), (unsigned long)(Y));         \
 592                 BUG();                                                  \
 593         }                                                               \
 594 } while(0)
 595
 596 #define ASSERTIF(C, X)                                          \
 597 do {                                                            \
 598         if (unlikely((C) && !(X))) {                            \
 599                 printk(KERN_ERR "\n");                          \
 600                 printk(KERN_ERR "AFS: Assertion failed\n");     \
 601                 BUG();                                          \
 602         }                                                       \
 603 } while(0)
 604
 605 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 606 do {                                                                    \
 607         if (unlikely((C) && !((X) OP (Y)))) {                           \
 608                 printk(KERN_ERR "\n");                                  \
 609                 printk(KERN_ERR "AFS: Assertion failed\n");             \
 610                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 611                        (unsigned long)(X), (unsigned long)(Y));         \
 612                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 613                        (unsigned long)(X), (unsigned long)(Y));         \
 614                 BUG();                                                  \
 615         }                                                               \
 616 } while(0)
 617
 618 #else
 619
 620 #define ASSERT(X)                               \
 621 do {                                            \
 622 } while(0)
 623
 624 #define ASSERTCMP(X, OP, Y)                     \
 625 do {                                            \
 626 } while(0)
 627
 628 #define ASSERTIF(C, X)                          \
 629 do {                                            \
 630 } while(0)
 631
 632 #define ASSERTIFCMP(C, X, OP, Y)                \
 633 do {                                            \
 634 } while(0)
 635
 636 #endif /* __KDEBUGALL */