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