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