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 #ifndef _LINUX_NFS_FS_H
   9 #define _LINUX_NFS_FS_H
  10
  11 #include <uapi/linux/nfs_fs.h>
  12
  13
  14 /*
  15  * Enable dprintk() debugging support for nfs client.
  16  */
  17 #ifdef CONFIG_NFS_DEBUG
  18 # define NFS_DEBUG
  19 #endif
  20
  21 #include <linux/in.h>
  22 #include <linux/mm.h>
  23 #include <linux/pagemap.h>
  24 #include <linux/rbtree.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/wait.h>
  27
  28 #include <linux/sunrpc/debug.h>
  29 #include <linux/sunrpc/auth.h>
  30 #include <linux/sunrpc/clnt.h>
  31
  32 #include <linux/nfs.h>
  33 #include <linux/nfs2.h>
  34 #include <linux/nfs3.h>
  35 #include <linux/nfs4.h>
  36 #include <linux/nfs_xdr.h>
  37 #include <linux/nfs_fs_sb.h>
  38
  39 #include <linux/mempool.h>
  40
  41 /*
  42  * These are the default flags for swap requests
  43  */
  44 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  45
  46 /*
  47  * NFSv3/v4 Access mode cache entry
  48  */
  49 struct nfs_access_entry {
  50         struct rb_node          rb_node;
  51         struct list_head        lru;
  52         unsigned long           jiffies;
  53         struct rpc_cred *       cred;
  54         int                     mask;
  55 };
  56
  57 struct nfs_lockowner {
  58         fl_owner_t l_owner;
  59         pid_t l_pid;
  60 };
  61
  62 #define NFS_IO_INPROGRESS 0
  63 struct nfs_io_counter {
  64         unsigned long flags;
  65         atomic_t io_count;
  66 };
  67
  68 struct nfs_lock_context {
  69         atomic_t count;
  70         struct list_head list;
  71         struct nfs_open_context *open_context;
  72         struct nfs_lockowner lockowner;
  73         struct nfs_io_counter io_count;
  74 };
  75
  76 struct nfs4_state;
  77 struct nfs_open_context {
  78         struct nfs_lock_context lock_context;
  79         struct dentry *dentry;
  80         struct rpc_cred *cred;
  81         struct nfs4_state *state;
  82         fmode_t mode;
  83
  84         unsigned long flags;
  85 #define NFS_CONTEXT_ERROR_WRITE         (0)
  86 #define NFS_CONTEXT_RESEND_WRITES       (1)
  87 #define NFS_CONTEXT_BAD                 (2)
  88         int error;
  89
  90         struct list_head list;
  91         struct nfs4_threshold   *mdsthreshold;
  92 };
  93
  94 struct nfs_open_dir_context {
  95         struct rpc_cred *cred;
  96         unsigned long attr_gencount;
  97         __u64 dir_cookie;
  98         __u64 dup_cookie;
  99         signed char duped;
 100 };
 101
 102 /*
 103  * NFSv4 delegation
 104  */
 105 struct nfs_delegation;
 106
 107 struct posix_acl;
 108
 109 /*
 110  * nfs fs inode data in memory
 111  */
 112 struct nfs_inode {
 113         /*
 114          * The 64bit 'inode number'
 115          */
 116         __u64 fileid;
 117
 118         /*
 119          * NFS file handle
 120          */
 121         struct nfs_fh           fh;
 122
 123         /*
 124          * Various flags
 125          */
 126         unsigned long           flags;                  /* atomic bit ops */
 127         unsigned long           cache_validity;         /* bit mask */
 128
 129         /*
 130          * read_cache_jiffies is when we started read-caching this inode.
 131          * attrtimeo is for how long the cached information is assumed
 132          * to be valid. A successful attribute revalidation doubles
 133          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 134          * acregmin/acdirmin.
 135          *
 136          * We need to revalidate the cached attrs for this inode if
 137          *
 138          *      jiffies - read_cache_jiffies >= attrtimeo
 139          *
 140          * Please note the comparison is greater than or equal
 141          * so that zero timeout values can be specified.
 142          */
 143         unsigned long           read_cache_jiffies;
 144         unsigned long           attrtimeo;
 145         unsigned long           attrtimeo_timestamp;
 146
 147         unsigned long           attr_gencount;
 148         /* "Generation counter" for the attribute cache. This is
 149          * bumped whenever we update the metadata on the
 150          * server.
 151          */
 152         unsigned long           cache_change_attribute;
 153
 154         struct rb_root          access_cache;
 155         struct list_head        access_cache_entry_lru;
 156         struct list_head        access_cache_inode_lru;
 157 #ifdef CONFIG_NFS_V3_ACL
 158         struct posix_acl        *acl_access;
 159         struct posix_acl        *acl_default;
 160 #endif
 161
 162         /*
 163          * This is the cookie verifier used for NFSv3 readdir
 164          * operations
 165          */
 166         __be32                  cookieverf[2];
 167
 168         unsigned long           npages;
 169         struct nfs_mds_commit_info commit_info;
 170
 171         /* Open contexts for shared mmap writes */
 172         struct list_head        open_files;
 173
 174         /* Number of in-flight sillydelete RPC calls */
 175         atomic_t                silly_count;
 176         /* List of deferred sillydelete requests */
 177         struct hlist_head       silly_list;
 178         wait_queue_head_t       waitqueue;
 179
 180 #if IS_ENABLED(CONFIG_NFS_V4)
 181         struct nfs4_cached_acl  *nfs4_acl;
 182         /* NFSv4 state */
 183         struct list_head        open_states;
 184         struct nfs_delegation __rcu *delegation;
 185         fmode_t                  delegation_state;
 186         struct rw_semaphore     rwsem;
 187
 188         /* pNFS layout information */
 189         struct pnfs_layout_hdr *layout;
 190 #endif /* CONFIG_NFS_V4*/
 191         /* how many bytes have been written/read and how many bytes queued up */
 192         __u64 write_io;
 193         __u64 read_io;
 194 #ifdef CONFIG_NFS_FSCACHE
 195         struct fscache_cookie   *fscache;
 196 #endif
 197         struct inode            vfs_inode;
 198 };
 199
 200 /*
 201  * Cache validity bit flags
 202  */
 203 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 204 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 205 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 206 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 207 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 208 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 209 #define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 210 #define NFS_INO_INVALID_LABEL   0x0080          /* cached label is invalid */
 211
 212 /*
 213  * Bit offsets in flags field
 214  */
 215 #define NFS_INO_ADVISE_RDPLUS   (0)             /* advise readdirplus */
 216 #define NFS_INO_STALE           (1)             /* possible stale inode */
 217 #define NFS_INO_ACL_LRU_SET     (2)             /* Inode is on the LRU list */
 218 #define NFS_INO_FLUSHING        (4)             /* inode is flushing out data */
 219 #define NFS_INO_FSCACHE         (5)             /* inode can be cached by FS-Cache */
 220 #define NFS_INO_FSCACHE_LOCK    (6)             /* FS-Cache cookie management lock */
 221 #define NFS_INO_COMMIT          (7)             /* inode is committing unstable writes */
 222 #define NFS_INO_LAYOUTCOMMIT    (9)             /* layoutcommit required */
 223 #define NFS_INO_LAYOUTCOMMITTING (10)           /* layoutcommit inflight */
 224
 225 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 226 {
 227         return container_of(inode, struct nfs_inode, vfs_inode);
 228 }
 229
 230 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 231 {
 232         return (struct nfs_server *)(s->s_fs_info);
 233 }
 234
 235 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 236 {
 237         return &NFS_I(inode)->fh;
 238 }
 239
 240 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 241 {
 242         return NFS_SB(inode->i_sb);
 243 }
 244
 245 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 246 {
 247         return NFS_SERVER(inode)->client;
 248 }
 249
 250 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 251 {
 252         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 253 }
 254
 255 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 256 {
 257         struct nfs_server *nfss = NFS_SERVER(inode);
 258         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 259 }
 260
 261 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 262 {
 263         struct nfs_server *nfss = NFS_SERVER(inode);
 264         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 265 }
 266
 267 static inline int NFS_STALE(const struct inode *inode)
 268 {
 269         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 270 }
 271
 272 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
 273 {
 274 #ifdef CONFIG_NFS_FSCACHE
 275         return NFS_I(inode)->fscache;
 276 #else
 277         return NULL;
 278 #endif
 279 }
 280
 281 static inline __u64 NFS_FILEID(const struct inode *inode)
 282 {
 283         return NFS_I(inode)->fileid;
 284 }
 285
 286 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 287 {
 288         NFS_I(inode)->fileid = fileid;
 289 }
 290
 291 static inline void nfs_mark_for_revalidate(struct inode *inode)
 292 {
 293         struct nfs_inode *nfsi = NFS_I(inode);
 294
 295         spin_lock(&inode->i_lock);
 296         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 297         if (S_ISDIR(inode->i_mode))
 298                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 299         spin_unlock(&inode->i_lock);
 300 }
 301
 302 static inline int nfs_server_capable(struct inode *inode, int cap)
 303 {
 304         return NFS_SERVER(inode)->caps & cap;
 305 }
 306
 307 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 308 {
 309         dentry->d_time = verf;
 310 }
 311
 312 /**
 313  * nfs_save_change_attribute - Returns the inode attribute change cookie
 314  * @dir - pointer to parent directory inode
 315  * The "change attribute" is updated every time we finish an operation
 316  * that will result in a metadata change on the server.
 317  */
 318 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 319 {
 320         return NFS_I(dir)->cache_change_attribute;
 321 }
 322
 323 /**
 324  * nfs_verify_change_attribute - Detects NFS remote directory changes
 325  * @dir - pointer to parent directory inode
 326  * @chattr - previously saved change attribute
 327  * Return "false" if the verifiers doesn't match the change attribute.
 328  * This would usually indicate that the directory contents have changed on
 329  * the server, and that any dentries need revalidating.
 330  */
 331 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 332 {
 333         return chattr == NFS_I(dir)->cache_change_attribute;
 334 }
 335
 336 /*
 337  * linux/fs/nfs/inode.c
 338  */
 339 extern int nfs_sync_mapping(struct address_space *mapping);
 340 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 341 extern void nfs_zap_caches(struct inode *);
 342 extern void nfs_invalidate_atime(struct inode *);
 343 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 344                                 struct nfs_fattr *, struct nfs4_label *);
 345 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 346 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 347 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 348 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 349 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 350 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
 351 extern int nfs_permission(struct inode *, int);
 352 extern int nfs_open(struct inode *, struct file *);
 353 extern int nfs_release(struct inode *, struct file *);
 354 extern int nfs_attribute_timeout(struct inode *inode);
 355 extern int nfs_attribute_cache_expired(struct inode *inode);
 356 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 357 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 358 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 359 extern int nfs_setattr(struct dentry *, struct iattr *);
 360 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 361 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 362                                 struct nfs4_label *label);
 363 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 364 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 365 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 366 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
 367 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
 368 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 369 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 370 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
 371 extern u64 nfs_compat_user_ino64(u64 fileid);
 372 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 373 extern unsigned long nfs_inc_attr_generation_counter(void);
 374
 375 extern struct nfs_fattr *nfs_alloc_fattr(void);
 376
 377 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
 378 {
 379         kfree(fattr);
 380 }
 381
 382 extern struct nfs_fh *nfs_alloc_fhandle(void);
 383
 384 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 385 {
 386         kfree(fh);
 387 }
 388
 389 #ifdef NFS_DEBUG
 390 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
 391 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 392 {
 393         return _nfs_display_fhandle_hash(fh);
 394 }
 395 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
 396 #define nfs_display_fhandle(fh, caption)                        \
 397         do {                                                    \
 398                 if (unlikely(nfs_debug & NFSDBG_FACILITY))      \
 399                         _nfs_display_fhandle(fh, caption);      \
 400         } while (0)
 401 #else
 402 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 403 {
 404         return 0;
 405 }
 406 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
 407                                        const char *caption)
 408 {
 409 }
 410 #endif
 411
 412 /*
 413  * linux/fs/nfs/nfsroot.c
 414  */
 415 extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
 416 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 417 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 418
 419 /*
 420  * linux/fs/nfs/file.c
 421  */
 422 extern const struct file_operations nfs_file_operations;
 423 #if IS_ENABLED(CONFIG_NFS_V4)
 424 extern const struct file_operations nfs4_file_operations;
 425 #endif /* CONFIG_NFS_V4 */
 426 extern const struct address_space_operations nfs_file_aops;
 427 extern const struct address_space_operations nfs_dir_aops;
 428
 429 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 430 {
 431         return filp->private_data;
 432 }
 433
 434 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 435 {
 436         if (file != NULL) {
 437                 struct nfs_open_context *ctx =
 438                         nfs_file_open_context(file);
 439                 if (ctx)
 440                         return ctx->cred;
 441         }
 442         return NULL;
 443 }
 444
 445 /*
 446  * linux/fs/nfs/xattr.c
 447  */
 448 #ifdef CONFIG_NFS_V3_ACL
 449 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 450 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 451 extern int nfs3_setxattr(struct dentry *, const char *,
 452                         const void *, size_t, int);
 453 extern int nfs3_removexattr (struct dentry *, const char *name);
 454 #else
 455 # define nfs3_listxattr NULL
 456 # define nfs3_getxattr NULL
 457 # define nfs3_setxattr NULL
 458 # define nfs3_removexattr NULL
 459 #endif
 460
 461 /*
 462  * linux/fs/nfs/direct.c
 463  */
 464 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 465                         unsigned long);
 466 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 467                         const struct iovec *iov, unsigned long nr_segs,
 468                         loff_t pos, bool uio);
 469 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 470                         const struct iovec *iov, unsigned long nr_segs,
 471                         loff_t pos, bool uio);
 472
 473 /*
 474  * linux/fs/nfs/dir.c
 475  */
 476 extern const struct file_operations nfs_dir_operations;
 477 extern const struct dentry_operations nfs_dentry_operations;
 478
 479 extern void nfs_force_lookup_revalidate(struct inode *dir);
 480 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
 481                         struct nfs_fattr *fattr, struct nfs4_label *label);
 482 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 483 extern void nfs_access_zap_cache(struct inode *inode);
 484
 485 /*
 486  * linux/fs/nfs/symlink.c
 487  */
 488 extern const struct inode_operations nfs_symlink_inode_operations;
 489
 490 /*
 491  * linux/fs/nfs/sysctl.c
 492  */
 493 #ifdef CONFIG_SYSCTL
 494 extern int nfs_register_sysctl(void);
 495 extern void nfs_unregister_sysctl(void);
 496 #else
 497 #define nfs_register_sysctl() 0
 498 #define nfs_unregister_sysctl() do { } while(0)
 499 #endif
 500
 501 /*
 502  * linux/fs/nfs/namespace.c
 503  */
 504 extern const struct inode_operations nfs_mountpoint_inode_operations;
 505 extern const struct inode_operations nfs_referral_inode_operations;
 506 extern int nfs_mountpoint_expiry_timeout;
 507 extern void nfs_release_automount_timer(void);
 508
 509 /*
 510  * linux/fs/nfs/unlink.c
 511  */
 512 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 513 extern void nfs_wait_on_sillyrename(struct dentry *dentry);
 514 extern void nfs_block_sillyrename(struct dentry *dentry);
 515 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 516 extern int  nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 517
 518 /*
 519  * linux/fs/nfs/write.c
 520  */
 521 extern int  nfs_congestion_kb;
 522 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 523 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 524 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 525 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 526 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 527
 528 /*
 529  * Try to write back everything synchronously (but check the
 530  * return value!)
 531  */
 532 extern int nfs_wb_all(struct inode *inode);
 533 extern int nfs_wb_page(struct inode *inode, struct page* page);
 534 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 535 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
 536 extern int  nfs_commit_inode(struct inode *, int);
 537 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
 538 extern void nfs_commit_free(struct nfs_commit_data *data);
 539 #else
 540 static inline int
 541 nfs_commit_inode(struct inode *inode, int how)
 542 {
 543         return 0;
 544 }
 545 #endif
 546
 547 static inline int
 548 nfs_have_writebacks(struct inode *inode)
 549 {
 550         return NFS_I(inode)->npages != 0;
 551 }
 552
 553 /*
 554  * linux/fs/nfs/read.c
 555  */
 556 extern int  nfs_readpage(struct file *, struct page *);
 557 extern int  nfs_readpages(struct file *, struct address_space *,
 558                 struct list_head *, unsigned);
 559 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 560 extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
 561                                struct page *);
 562
 563 /*
 564  * linux/fs/nfs3proc.c
 565  */
 566 #ifdef CONFIG_NFS_V3_ACL
 567 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 568 extern int nfs3_proc_setacl(struct inode *inode, int type,
 569                             struct posix_acl *acl);
 570 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 571                 umode_t mode);
 572 extern void nfs3_forget_cached_acls(struct inode *inode);
 573 #else
 574 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 575                                             struct inode *inode,
 576                                             umode_t mode)
 577 {
 578         return 0;
 579 }
 580
 581 static inline void nfs3_forget_cached_acls(struct inode *inode)
 582 {
 583 }
 584 #endif /* CONFIG_NFS_V3_ACL */
 585
 586 /*
 587  * inline functions
 588  */
 589
 590 static inline loff_t nfs_size_to_loff_t(__u64 size)
 591 {
 592         if (size > (__u64) OFFSET_MAX - 1)
 593                 return OFFSET_MAX - 1;
 594         return (loff_t) size;
 595 }
 596
 597 static inline ino_t
 598 nfs_fileid_to_ino_t(u64 fileid)
 599 {
 600         ino_t ino = (ino_t) fileid;
 601         if (sizeof(ino_t) < sizeof(u64))
 602                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 603         return ino;
 604 }
 605
 606 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 607
 608
 609 # undef ifdebug
 610 # ifdef NFS_DEBUG
 611 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 612 #  define NFS_IFDEBUG(x)        x
 613 # else
 614 #  define ifdebug(fac)          if (0)
 615 #  define NFS_IFDEBUG(x)
 616 # endif
 617 #endif