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