include/linux/nfs_fs.h

   1 /*
   2  *  linux/include/linux/nfs_fs.h
   3  *
   4  *  Copyright (C) 1992  Rick Sladkey
   5  *
   6  *  OS-specific nfs filesystem definitions and declarations
   7  */
   8
   9 #ifndef _LINUX_NFS_FS_H
  10 #define _LINUX_NFS_FS_H
  11
  12 #include <linux/magic.h>
  13
  14 /* Default timeout values */
  15 #define NFS_DEF_UDP_TIMEO       (11)
  16 #define NFS_DEF_UDP_RETRANS     (3)
  17 #define NFS_DEF_TCP_TIMEO       (600)
  18 #define NFS_DEF_TCP_RETRANS     (2)
  19
  20 #define NFS_MAX_UDP_TIMEOUT     (60*HZ)
  21 #define NFS_MAX_TCP_TIMEOUT     (600*HZ)
  22
  23 #define NFS_DEF_ACREGMIN        (3)
  24 #define NFS_DEF_ACREGMAX        (60)
  25 #define NFS_DEF_ACDIRMIN        (30)
  26 #define NFS_DEF_ACDIRMAX        (60)
  27
  28 /*
  29  * When flushing a cluster of dirty pages, there can be different
  30  * strategies:
  31  */
  32 #define FLUSH_SYNC              1       /* file being synced, or contention */
  33 #define FLUSH_STABLE            4       /* commit to stable storage */
  34 #define FLUSH_LOWPRI            8       /* low priority background flush */
  35 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  36 #define FLUSH_COND_STABLE       32      /* conditional stable write - only stable
  37                                          * if everything fits in one RPC */
  38
  39 #ifdef __KERNEL__
  40
  41 /*
  42  * Enable dprintk() debugging support for nfs client.
  43  */
  44 #ifdef CONFIG_NFS_DEBUG
  45 # define NFS_DEBUG
  46 #endif
  47
  48 #include <linux/in.h>
  49 #include <linux/mm.h>
  50 #include <linux/pagemap.h>
  51 #include <linux/rbtree.h>
  52 #include <linux/rwsem.h>
  53 #include <linux/wait.h>
  54
  55 #include <linux/sunrpc/debug.h>
  56 #include <linux/sunrpc/auth.h>
  57 #include <linux/sunrpc/clnt.h>
  58
  59 #include <linux/nfs.h>
  60 #include <linux/nfs2.h>
  61 #include <linux/nfs3.h>
  62 #include <linux/nfs4.h>
  63 #include <linux/nfs_xdr.h>
  64 #include <linux/nfs_fs_sb.h>
  65
  66 #include <linux/mempool.h>
  67
  68 /*
  69  * These are the default flags for swap requests
  70  */
  71 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  72
  73 /*
  74  * NFSv3/v4 Access mode cache entry
  75  */
  76 struct nfs_access_entry {
  77         struct rb_node          rb_node;
  78         struct list_head        lru;
  79         unsigned long           jiffies;
  80         struct rpc_cred *       cred;
  81         int                     mask;
  82 };
  83
  84 struct nfs_lock_context {
  85         atomic_t count;
  86         struct list_head list;
  87         struct nfs_open_context *open_context;
  88         fl_owner_t lockowner;
  89         pid_t pid;
  90 };
  91
  92 struct nfs4_state;
  93 struct nfs_open_context {
  94         struct nfs_lock_context lock_context;
  95         struct dentry *dentry;
  96         struct rpc_cred *cred;
  97         struct nfs4_state *state;
  98         fmode_t mode;
  99
 100         unsigned long flags;
 101 #define NFS_CONTEXT_ERROR_WRITE         (0)
 102         int error;
 103
 104         struct list_head list;
 105         struct nfs4_threshold   *mdsthreshold;
 106 };
 107
 108 struct nfs_open_dir_context {
 109         struct rpc_cred *cred;
 110         unsigned long attr_gencount;
 111         __u64 dir_cookie;
 112         __u64 dup_cookie;
 113         signed char duped;
 114 };
 115
 116 /*
 117  * NFSv4 delegation
 118  */
 119 struct nfs_delegation;
 120
 121 struct posix_acl;
 122
 123 /*
 124  * nfs fs inode data in memory
 125  */
 126 struct nfs_inode {
 127         /*
 128          * The 64bit 'inode number'
 129          */
 130         __u64 fileid;
 131
 132         /*
 133          * NFS file handle
 134          */
 135         struct nfs_fh           fh;
 136
 137         /*
 138          * Various flags
 139          */
 140         unsigned long           flags;                  /* atomic bit ops */
 141         unsigned long           cache_validity;         /* bit mask */
 142
 143         /*
 144          * read_cache_jiffies is when we started read-caching this inode.
 145          * attrtimeo is for how long the cached information is assumed
 146          * to be valid. A successful attribute revalidation doubles
 147          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 148          * acregmin/acdirmin.
 149          *
 150          * We need to revalidate the cached attrs for this inode if
 151          *
 152          *      jiffies - read_cache_jiffies >= attrtimeo
 153          *
 154          * Please note the comparison is greater than or equal
 155          * so that zero timeout values can be specified.
 156          */
 157         unsigned long           read_cache_jiffies;
 158         unsigned long           attrtimeo;
 159         unsigned long           attrtimeo_timestamp;
 160
 161         unsigned long           attr_gencount;
 162         /* "Generation counter" for the attribute cache. This is
 163          * bumped whenever we update the metadata on the
 164          * server.
 165          */
 166         unsigned long           cache_change_attribute;
 167
 168         struct rb_root          access_cache;
 169         struct list_head        access_cache_entry_lru;
 170         struct list_head        access_cache_inode_lru;
 171 #ifdef CONFIG_NFS_V3_ACL
 172         struct posix_acl        *acl_access;
 173         struct posix_acl        *acl_default;
 174 #endif
 175
 176         /*
 177          * This is the cookie verifier used for NFSv3 readdir
 178          * operations
 179          */
 180         __be32                  cookieverf[2];
 181
 182         unsigned long           npages;
 183         struct nfs_mds_commit_info commit_info;
 184
 185         /* Open contexts for shared mmap writes */
 186         struct list_head        open_files;
 187
 188         /* Number of in-flight sillydelete RPC calls */
 189         atomic_t                silly_count;
 190         /* List of deferred sillydelete requests */
 191         struct hlist_head       silly_list;
 192         wait_queue_head_t       waitqueue;
 193
 194 #ifdef CONFIG_NFS_V4
 195         struct nfs4_cached_acl  *nfs4_acl;
 196         /* NFSv4 state */
 197         struct list_head        open_states;
 198         struct nfs_delegation __rcu *delegation;
 199         fmode_t                  delegation_state;
 200         struct rw_semaphore     rwsem;
 201
 202         /* pNFS layout information */
 203         struct pnfs_layout_hdr *layout;
 204 #endif /* CONFIG_NFS_V4*/
 205 #ifdef CONFIG_NFS_FSCACHE
 206         struct fscache_cookie   *fscache;
 207 #endif
 208         struct inode            vfs_inode;
 209 };
 210
 211 /*
 212  * Cache validity bit flags
 213  */
 214 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 215 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 216 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 217 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 218 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 219 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 220 #define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 221
 222 /*
 223  * Bit offsets in flags field
 224  */
 225 #define NFS_INO_ADVISE_RDPLUS   (0)             /* advise readdirplus */
 226 #define NFS_INO_STALE           (1)             /* possible stale inode */
 227 #define NFS_INO_ACL_LRU_SET     (2)             /* Inode is on the LRU list */
 228 #define NFS_INO_FLUSHING        (4)             /* inode is flushing out data */
 229 #define NFS_INO_FSCACHE         (5)             /* inode can be cached by FS-Cache */
 230 #define NFS_INO_FSCACHE_LOCK    (6)             /* FS-Cache cookie management lock */
 231 #define NFS_INO_COMMIT          (7)             /* inode is committing unstable writes */
 232 #define NFS_INO_LAYOUTCOMMIT    (9)             /* layoutcommit required */
 233 #define NFS_INO_LAYOUTCOMMITTING (10)           /* layoutcommit inflight */
 234
 235 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 236 {
 237         return container_of(inode, struct nfs_inode, vfs_inode);
 238 }
 239
 240 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 241 {
 242         return (struct nfs_server *)(s->s_fs_info);
 243 }
 244
 245 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 246 {
 247         return &NFS_I(inode)->fh;
 248 }
 249
 250 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 251 {
 252         return NFS_SB(inode->i_sb);
 253 }
 254
 255 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 256 {
 257         return NFS_SERVER(inode)->client;
 258 }
 259
 260 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 261 {
 262         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 263 }
 264
 265 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
 266 {
 267         return NFS_I(inode)->cookieverf;
 268 }
 269
 270 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 271 {
 272         struct nfs_server *nfss = NFS_SERVER(inode);
 273         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 274 }
 275
 276 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 277 {
 278         struct nfs_server *nfss = NFS_SERVER(inode);
 279         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 280 }
 281
 282 static inline int NFS_STALE(const struct inode *inode)
 283 {
 284         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 285 }
 286
 287 static inline int NFS_FSCACHE(const struct inode *inode)
 288 {
 289         return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
 290 }
 291
 292 static inline __u64 NFS_FILEID(const struct inode *inode)
 293 {
 294         return NFS_I(inode)->fileid;
 295 }
 296
 297 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 298 {
 299         NFS_I(inode)->fileid = fileid;
 300 }
 301
 302 static inline void nfs_mark_for_revalidate(struct inode *inode)
 303 {
 304         struct nfs_inode *nfsi = NFS_I(inode);
 305
 306         spin_lock(&inode->i_lock);
 307         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 308         if (S_ISDIR(inode->i_mode))
 309                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 310         spin_unlock(&inode->i_lock);
 311 }
 312
 313 static inline int nfs_server_capable(struct inode *inode, int cap)
 314 {
 315         return NFS_SERVER(inode)->caps & cap;
 316 }
 317
 318 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 319 {
 320         dentry->d_time = verf;
 321 }
 322
 323 /**
 324  * nfs_save_change_attribute - Returns the inode attribute change cookie
 325  * @dir - pointer to parent directory inode
 326  * The "change attribute" is updated every time we finish an operation
 327  * that will result in a metadata change on the server.
 328  */
 329 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 330 {
 331         return NFS_I(dir)->cache_change_attribute;
 332 }
 333
 334 /**
 335  * nfs_verify_change_attribute - Detects NFS remote directory changes
 336  * @dir - pointer to parent directory inode
 337  * @chattr - previously saved change attribute
 338  * Return "false" if the verifiers doesn't match the change attribute.
 339  * This would usually indicate that the directory contents have changed on
 340  * the server, and that any dentries need revalidating.
 341  */
 342 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 343 {
 344         return chattr == NFS_I(dir)->cache_change_attribute;
 345 }
 346
 347 /*
 348  * linux/fs/nfs/inode.c
 349  */
 350 extern int nfs_sync_mapping(struct address_space *mapping);
 351 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 352 extern void nfs_zap_caches(struct inode *);
 353 extern void nfs_invalidate_atime(struct inode *);
 354 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 355                                 struct nfs_fattr *);
 356 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 357 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 358 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 359 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 360 extern int nfs_permission(struct inode *, int);
 361 extern int nfs_open(struct inode *, struct file *);
 362 extern int nfs_release(struct inode *, struct file *);
 363 extern int nfs_attribute_timeout(struct inode *inode);
 364 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 365 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 366 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 367 extern int nfs_setattr(struct dentry *, struct iattr *);
 368 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 369 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 370 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 371 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 372 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
 373 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 374 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 375 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
 376 extern u64 nfs_compat_user_ino64(u64 fileid);
 377 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 378 extern unsigned long nfs_inc_attr_generation_counter(void);
 379
 380 extern struct nfs_fattr *nfs_alloc_fattr(void);
 381
 382 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
 383 {
 384         kfree(fattr);
 385 }
 386
 387 extern struct nfs_fh *nfs_alloc_fhandle(void);
 388
 389 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 390 {
 391         kfree(fh);
 392 }
 393
 394 #ifdef NFS_DEBUG
 395 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
 396 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 397 {
 398         return _nfs_display_fhandle_hash(fh);
 399 }
 400 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
 401 #define nfs_display_fhandle(fh, caption)                        \
 402         do {                                                    \
 403                 if (unlikely(nfs_debug & NFSDBG_FACILITY))      \
 404                         _nfs_display_fhandle(fh, caption);      \
 405         } while (0)
 406 #else
 407 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 408 {
 409         return 0;
 410 }
 411 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
 412                                        const char *caption)
 413 {
 414 }
 415 #endif
 416
 417 /*
 418  * linux/fs/nfs/nfsroot.c
 419  */
 420 extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
 421 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 422 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 423
 424 /*
 425  * linux/fs/nfs/file.c
 426  */
 427 extern const struct inode_operations nfs_file_inode_operations;
 428 #ifdef CONFIG_NFS_V3
 429 extern const struct inode_operations nfs3_file_inode_operations;
 430 #endif /* CONFIG_NFS_V3 */
 431 extern const struct file_operations nfs_file_operations;
 432 #ifdef CONFIG_NFS_V4
 433 extern const struct file_operations nfs4_file_operations;
 434 #endif /* CONFIG_NFS_V4 */
 435 extern const struct address_space_operations nfs_file_aops;
 436 extern const struct address_space_operations nfs_dir_aops;
 437
 438 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 439 {
 440         return filp->private_data;
 441 }
 442
 443 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 444 {
 445         if (file != NULL) {
 446                 struct nfs_open_context *ctx =
 447                         nfs_file_open_context(file);
 448                 if (ctx)
 449                         return ctx->cred;
 450         }
 451         return NULL;
 452 }
 453
 454 /*
 455  * linux/fs/nfs/xattr.c
 456  */
 457 #ifdef CONFIG_NFS_V3_ACL
 458 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 459 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 460 extern int nfs3_setxattr(struct dentry *, const char *,
 461                         const void *, size_t, int);
 462 extern int nfs3_removexattr (struct dentry *, const char *name);
 463 #else
 464 # define nfs3_listxattr NULL
 465 # define nfs3_getxattr NULL
 466 # define nfs3_setxattr NULL
 467 # define nfs3_removexattr NULL
 468 #endif
 469
 470 /*
 471  * linux/fs/nfs/direct.c
 472  */
 473 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 474                         unsigned long);
 475 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 476                         const struct iovec *iov, unsigned long nr_segs,
 477                         loff_t pos);
 478 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 479                         const struct iovec *iov, unsigned long nr_segs,
 480                         loff_t pos);
 481
 482 /*
 483  * linux/fs/nfs/dir.c
 484  */
 485 extern const struct inode_operations nfs_dir_inode_operations;
 486 #ifdef CONFIG_NFS_V3
 487 extern const struct inode_operations nfs3_dir_inode_operations;
 488 #endif /* CONFIG_NFS_V3 */
 489 extern const struct file_operations nfs_dir_operations;
 490 extern const struct dentry_operations nfs_dentry_operations;
 491
 492 extern void nfs_force_lookup_revalidate(struct inode *dir);
 493 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 494 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 495 extern void nfs_access_zap_cache(struct inode *inode);
 496
 497 /*
 498  * linux/fs/nfs/symlink.c
 499  */
 500 extern const struct inode_operations nfs_symlink_inode_operations;
 501
 502 /*
 503  * linux/fs/nfs/sysctl.c
 504  */
 505 #ifdef CONFIG_SYSCTL
 506 extern int nfs_register_sysctl(void);
 507 extern void nfs_unregister_sysctl(void);
 508 #else
 509 #define nfs_register_sysctl() 0
 510 #define nfs_unregister_sysctl() do { } while(0)
 511 #endif
 512
 513 /*
 514  * linux/fs/nfs/namespace.c
 515  */
 516 extern const struct inode_operations nfs_mountpoint_inode_operations;
 517 extern const struct inode_operations nfs_referral_inode_operations;
 518 extern int nfs_mountpoint_expiry_timeout;
 519 extern void nfs_release_automount_timer(void);
 520
 521 /*
 522  * linux/fs/nfs/unlink.c
 523  */
 524 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 525 extern void nfs_block_sillyrename(struct dentry *dentry);
 526 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 527 extern int  nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 528
 529 /*
 530  * linux/fs/nfs/write.c
 531  */
 532 extern int  nfs_congestion_kb;
 533 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 534 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 535 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 536 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 537 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 538
 539 /*
 540  * Try to write back everything synchronously (but check the
 541  * return value!)
 542  */
 543 extern int nfs_wb_all(struct inode *inode);
 544 extern int nfs_wb_page(struct inode *inode, struct page* page);
 545 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 546 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 547 extern int  nfs_commit_inode(struct inode *, int);
 548 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
 549 extern void nfs_commit_free(struct nfs_commit_data *data);
 550 #else
 551 static inline int
 552 nfs_commit_inode(struct inode *inode, int how)
 553 {
 554         return 0;
 555 }
 556 #endif
 557
 558 static inline int
 559 nfs_have_writebacks(struct inode *inode)
 560 {
 561         return NFS_I(inode)->npages != 0;
 562 }
 563
 564 /*
 565  * linux/fs/nfs/read.c
 566  */
 567 extern int  nfs_readpage(struct file *, struct page *);
 568 extern int  nfs_readpages(struct file *, struct address_space *,
 569                 struct list_head *, unsigned);
 570 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 571 extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
 572                                struct page *);
 573
 574 /*
 575  * linux/fs/nfs3proc.c
 576  */
 577 #ifdef CONFIG_NFS_V3_ACL
 578 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 579 extern int nfs3_proc_setacl(struct inode *inode, int type,
 580                             struct posix_acl *acl);
 581 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 582                 umode_t mode);
 583 extern void nfs3_forget_cached_acls(struct inode *inode);
 584 #else
 585 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 586                                             struct inode *inode,
 587                                             umode_t mode)
 588 {
 589         return 0;
 590 }
 591
 592 static inline void nfs3_forget_cached_acls(struct inode *inode)
 593 {
 594 }
 595 #endif /* CONFIG_NFS_V3_ACL */
 596
 597 /*
 598  * inline functions
 599  */
 600
 601 static inline loff_t nfs_size_to_loff_t(__u64 size)
 602 {
 603         if (size > (__u64) OFFSET_MAX - 1)
 604                 return OFFSET_MAX - 1;
 605         return (loff_t) size;
 606 }
 607
 608 static inline ino_t
 609 nfs_fileid_to_ino_t(u64 fileid)
 610 {
 611         ino_t ino = (ino_t) fileid;
 612         if (sizeof(ino_t) < sizeof(u64))
 613                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 614         return ino;
 615 }
 616
 617 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 618
 619 #endif /* __KERNEL__ */
 620
 621 /*
 622  * NFS debug flags
 623  */
 624 #define NFSDBG_VFS              0x0001
 625 #define NFSDBG_DIRCACHE         0x0002
 626 #define NFSDBG_LOOKUPCACHE      0x0004
 627 #define NFSDBG_PAGECACHE        0x0008
 628 #define NFSDBG_PROC             0x0010
 629 #define NFSDBG_XDR              0x0020
 630 #define NFSDBG_FILE             0x0040
 631 #define NFSDBG_ROOT             0x0080
 632 #define NFSDBG_CALLBACK         0x0100
 633 #define NFSDBG_CLIENT           0x0200
 634 #define NFSDBG_MOUNT            0x0400
 635 #define NFSDBG_FSCACHE          0x0800
 636 #define NFSDBG_PNFS             0x1000
 637 #define NFSDBG_PNFS_LD          0x2000
 638 #define NFSDBG_STATE            0x4000
 639 #define NFSDBG_ALL              0xFFFF
 640
 641 #ifdef __KERNEL__
 642
 643 # undef ifdebug
 644 # ifdef NFS_DEBUG
 645 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 646 #  define NFS_IFDEBUG(x)        x
 647 # else
 648 #  define ifdebug(fac)          if (0)
 649 #  define NFS_IFDEBUG(x)
 650 # endif
 651 #endif /* __KERNEL */
 652
 653 #endif