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 #endif /* CONFIG_NFS_V4*/
 202 #ifdef CONFIG_NFS_FSCACHE
 203         struct fscache_cookie   *fscache;
 204 #endif
 205         struct inode            vfs_inode;
 206 };
 207
 208 /*
 209  * Cache validity bit flags
 210  */
 211 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 212 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 213 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 214 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 215 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 216 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 217 #define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 218
 219 /*
 220  * Bit offsets in flags field
 221  */
 222 #define NFS_INO_ADVISE_RDPLUS   (0)             /* advise readdirplus */
 223 #define NFS_INO_STALE           (1)             /* possible stale inode */
 224 #define NFS_INO_ACL_LRU_SET     (2)             /* Inode is on the LRU list */
 225 #define NFS_INO_FLUSHING        (4)             /* inode is flushing out data */
 226 #define NFS_INO_FSCACHE         (5)             /* inode can be cached by FS-Cache */
 227 #define NFS_INO_FSCACHE_LOCK    (6)             /* FS-Cache cookie management lock */
 228 #define NFS_INO_COMMIT          (7)             /* inode is committing unstable writes */
 229 #define NFS_INO_PNFS_COMMIT     (8)             /* use pnfs code for commit */
 230
 231 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 232 {
 233         return container_of(inode, struct nfs_inode, vfs_inode);
 234 }
 235
 236 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 237 {
 238         return (struct nfs_server *)(s->s_fs_info);
 239 }
 240
 241 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 242 {
 243         return &NFS_I(inode)->fh;
 244 }
 245
 246 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 247 {
 248         return NFS_SB(inode->i_sb);
 249 }
 250
 251 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 252 {
 253         return NFS_SERVER(inode)->client;
 254 }
 255
 256 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 257 {
 258         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 259 }
 260
 261 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
 262 {
 263         return NFS_I(inode)->cookieverf;
 264 }
 265
 266 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 267 {
 268         struct nfs_server *nfss = NFS_SERVER(inode);
 269         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 270 }
 271
 272 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 273 {
 274         struct nfs_server *nfss = NFS_SERVER(inode);
 275         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 276 }
 277
 278 static inline int NFS_STALE(const struct inode *inode)
 279 {
 280         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 281 }
 282
 283 static inline int NFS_FSCACHE(const struct inode *inode)
 284 {
 285         return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
 286 }
 287
 288 static inline __u64 NFS_FILEID(const struct inode *inode)
 289 {
 290         return NFS_I(inode)->fileid;
 291 }
 292
 293 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 294 {
 295         NFS_I(inode)->fileid = fileid;
 296 }
 297
 298 static inline void nfs_mark_for_revalidate(struct inode *inode)
 299 {
 300         struct nfs_inode *nfsi = NFS_I(inode);
 301
 302         spin_lock(&inode->i_lock);
 303         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 304         if (S_ISDIR(inode->i_mode))
 305                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 306         spin_unlock(&inode->i_lock);
 307 }
 308
 309 static inline int nfs_server_capable(struct inode *inode, int cap)
 310 {
 311         return NFS_SERVER(inode)->caps & cap;
 312 }
 313
 314 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 315 {
 316         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
 317 }
 318
 319 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 320 {
 321         dentry->d_time = verf;
 322 }
 323
 324 /**
 325  * nfs_save_change_attribute - Returns the inode attribute change cookie
 326  * @dir - pointer to parent directory inode
 327  * The "change attribute" is updated every time we finish an operation
 328  * that will result in a metadata change on the server.
 329  */
 330 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 331 {
 332         return NFS_I(dir)->cache_change_attribute;
 333 }
 334
 335 /**
 336  * nfs_verify_change_attribute - Detects NFS remote directory changes
 337  * @dir - pointer to parent directory inode
 338  * @chattr - previously saved change attribute
 339  * Return "false" if the verifiers doesn't match the change attribute.
 340  * This would usually indicate that the directory contents have changed on
 341  * the server, and that any dentries need revalidating.
 342  */
 343 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 344 {
 345         return chattr == NFS_I(dir)->cache_change_attribute;
 346 }
 347
 348 /*
 349  * linux/fs/nfs/inode.c
 350  */
 351 extern int nfs_sync_mapping(struct address_space *mapping);
 352 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 353 extern void nfs_zap_caches(struct inode *);
 354 extern void nfs_invalidate_atime(struct inode *);
 355 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 356                                 struct nfs_fattr *);
 357 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 358 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 359 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 360 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 361 extern int nfs_permission(struct inode *, int, unsigned int);
 362 extern int nfs_open(struct inode *, struct file *);
 363 extern int nfs_release(struct inode *, struct file *);
 364 extern int nfs_attribute_timeout(struct inode *inode);
 365 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 366 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 367 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 368 extern int nfs_setattr(struct dentry *, struct iattr *);
 369 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 370 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 371 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 372 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 373 extern struct nfs_open_context *alloc_nfs_open_context(struct path *path, struct rpc_cred *cred, fmode_t f_mode);
 374 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 375 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 376 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
 377 extern u64 nfs_compat_user_ino64(u64 fileid);
 378 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 379 extern unsigned long nfs_inc_attr_generation_counter(void);
 380
 381 extern struct nfs_fattr *nfs_alloc_fattr(void);
 382
 383 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
 384 {
 385         kfree(fattr);
 386 }
 387
 388 extern struct nfs_fh *nfs_alloc_fhandle(void);
 389
 390 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 391 {
 392         kfree(fh);
 393 }
 394
 395 /*
 396  * linux/fs/nfs/nfsroot.c
 397  */
 398 extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
 399 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 400 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 401
 402 /*
 403  * linux/fs/nfs/file.c
 404  */
 405 extern const struct inode_operations nfs_file_inode_operations;
 406 #ifdef CONFIG_NFS_V3
 407 extern const struct inode_operations nfs3_file_inode_operations;
 408 #endif /* CONFIG_NFS_V3 */
 409 extern const struct file_operations nfs_file_operations;
 410 extern const struct address_space_operations nfs_file_aops;
 411 extern const struct address_space_operations nfs_dir_aops;
 412
 413 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 414 {
 415         return filp->private_data;
 416 }
 417
 418 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 419 {
 420         if (file != NULL) {
 421                 struct nfs_open_context *ctx =
 422                         nfs_file_open_context(file);
 423                 if (ctx)
 424                         return ctx->cred;
 425         }
 426         return NULL;
 427 }
 428
 429 /*
 430  * linux/fs/nfs/xattr.c
 431  */
 432 #ifdef CONFIG_NFS_V3_ACL
 433 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 434 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 435 extern int nfs3_setxattr(struct dentry *, const char *,
 436                         const void *, size_t, int);
 437 extern int nfs3_removexattr (struct dentry *, const char *name);
 438 #else
 439 # define nfs3_listxattr NULL
 440 # define nfs3_getxattr NULL
 441 # define nfs3_setxattr NULL
 442 # define nfs3_removexattr NULL
 443 #endif
 444
 445 /*
 446  * linux/fs/nfs/direct.c
 447  */
 448 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 449                         unsigned long);
 450 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 451                         const struct iovec *iov, unsigned long nr_segs,
 452                         loff_t pos);
 453 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 454                         const struct iovec *iov, unsigned long nr_segs,
 455                         loff_t pos);
 456
 457 /*
 458  * linux/fs/nfs/dir.c
 459  */
 460 extern const struct inode_operations nfs_dir_inode_operations;
 461 #ifdef CONFIG_NFS_V3
 462 extern const struct inode_operations nfs3_dir_inode_operations;
 463 #endif /* CONFIG_NFS_V3 */
 464 extern const struct file_operations nfs_dir_operations;
 465 extern const struct dentry_operations nfs_dentry_operations;
 466
 467 extern void nfs_force_lookup_revalidate(struct inode *dir);
 468 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 469 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 470 extern void nfs_access_zap_cache(struct inode *inode);
 471
 472 /*
 473  * linux/fs/nfs/symlink.c
 474  */
 475 extern const struct inode_operations nfs_symlink_inode_operations;
 476
 477 /*
 478  * linux/fs/nfs/sysctl.c
 479  */
 480 #ifdef CONFIG_SYSCTL
 481 extern int nfs_register_sysctl(void);
 482 extern void nfs_unregister_sysctl(void);
 483 #else
 484 #define nfs_register_sysctl() 0
 485 #define nfs_unregister_sysctl() do { } while(0)
 486 #endif
 487
 488 /*
 489  * linux/fs/nfs/namespace.c
 490  */
 491 extern const struct inode_operations nfs_mountpoint_inode_operations;
 492 extern const struct inode_operations nfs_referral_inode_operations;
 493 extern int nfs_mountpoint_expiry_timeout;
 494 extern void nfs_release_automount_timer(void);
 495
 496 /*
 497  * linux/fs/nfs/unlink.c
 498  */
 499 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 500 extern void nfs_block_sillyrename(struct dentry *dentry);
 501 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 502 extern int  nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 503
 504 /*
 505  * linux/fs/nfs/write.c
 506  */
 507 extern int  nfs_congestion_kb;
 508 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 509 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 510 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 511 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 512 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 513
 514 /*
 515  * Try to write back everything synchronously (but check the
 516  * return value!)
 517  */
 518 extern int nfs_wb_all(struct inode *inode);
 519 extern int nfs_wb_page(struct inode *inode, struct page* page);
 520 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 521 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 522 extern int  nfs_commit_inode(struct inode *, int);
 523 extern struct nfs_write_data *nfs_commitdata_alloc(void);
 524 extern void nfs_commit_free(struct nfs_write_data *wdata);
 525 #else
 526 static inline int
 527 nfs_commit_inode(struct inode *inode, int how)
 528 {
 529         return 0;
 530 }
 531 #endif
 532
 533 static inline int
 534 nfs_have_writebacks(struct inode *inode)
 535 {
 536         return NFS_I(inode)->npages != 0;
 537 }
 538
 539 /*
 540  * Allocate nfs_write_data structures
 541  */
 542 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 543 extern void nfs_writedata_free(struct nfs_write_data *);
 544
 545 /*
 546  * linux/fs/nfs/read.c
 547  */
 548 extern int  nfs_readpage(struct file *, struct page *);
 549 extern int  nfs_readpages(struct file *, struct address_space *,
 550                 struct list_head *, unsigned);
 551 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 552 extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
 553                                struct page *);
 554
 555 /*
 556  * Allocate nfs_read_data structures
 557  */
 558 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 559 extern void nfs_readdata_free(struct nfs_read_data *);
 560
 561 /*
 562  * linux/fs/nfs3proc.c
 563  */
 564 #ifdef CONFIG_NFS_V3_ACL
 565 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 566 extern int nfs3_proc_setacl(struct inode *inode, int type,
 567                             struct posix_acl *acl);
 568 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 569                 mode_t mode);
 570 extern void nfs3_forget_cached_acls(struct inode *inode);
 571 #else
 572 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 573                                             struct inode *inode,
 574                                             mode_t mode)
 575 {
 576         return 0;
 577 }
 578
 579 static inline void nfs3_forget_cached_acls(struct inode *inode)
 580 {
 581 }
 582 #endif /* CONFIG_NFS_V3_ACL */
 583
 584 /*
 585  * inline functions
 586  */
 587
 588 static inline loff_t nfs_size_to_loff_t(__u64 size)
 589 {
 590         if (size > (__u64) OFFSET_MAX - 1)
 591                 return OFFSET_MAX - 1;
 592         return (loff_t) size;
 593 }
 594
 595 static inline ino_t
 596 nfs_fileid_to_ino_t(u64 fileid)
 597 {
 598         ino_t ino = (ino_t) fileid;
 599         if (sizeof(ino_t) < sizeof(u64))
 600                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 601         return ino;
 602 }
 603
 604 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 605
 606 #endif /* __KERNEL__ */
 607
 608 /*
 609  * NFS debug flags
 610  */
 611 #define NFSDBG_VFS              0x0001
 612 #define NFSDBG_DIRCACHE         0x0002
 613 #define NFSDBG_LOOKUPCACHE      0x0004
 614 #define NFSDBG_PAGECACHE        0x0008
 615 #define NFSDBG_PROC             0x0010
 616 #define NFSDBG_XDR              0x0020
 617 #define NFSDBG_FILE             0x0040
 618 #define NFSDBG_ROOT             0x0080
 619 #define NFSDBG_CALLBACK         0x0100
 620 #define NFSDBG_CLIENT           0x0200
 621 #define NFSDBG_MOUNT            0x0400
 622 #define NFSDBG_FSCACHE          0x0800
 623 #define NFSDBG_PNFS             0x1000
 624 #define NFSDBG_PNFS_LD          0x2000
 625 #define NFSDBG_ALL              0xFFFF
 626
 627 #ifdef __KERNEL__
 628
 629 /*
 630  * Enable debugging support for nfs client.
 631  * Requires RPC_DEBUG.
 632  */
 633 #ifdef RPC_DEBUG
 634 # define NFS_DEBUG
 635 #endif
 636
 637 # undef ifdebug
 638 # ifdef NFS_DEBUG
 639 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 640 # else
 641 #  define ifdebug(fac)          if (0)
 642 # endif
 643 #endif /* __KERNEL */
 644
 645 #endif