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 dentry *dentry;
  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         unsigned long attr_gencount;
 103         __u64 dir_cookie;
 104         __u64 dup_cookie;
 105         signed char duped;
 106 };
 107
 108 /*
 109  * NFSv4 delegation
 110  */
 111 struct nfs_delegation;
 112
 113 struct posix_acl;
 114
 115 /*
 116  * nfs fs inode data in memory
 117  */
 118 struct nfs_inode {
 119         /*
 120          * The 64bit 'inode number'
 121          */
 122         __u64 fileid;
 123
 124         /*
 125          * NFS file handle
 126          */
 127         struct nfs_fh           fh;
 128
 129         /*
 130          * Various flags
 131          */
 132         unsigned long           flags;                  /* atomic bit ops */
 133         unsigned long           cache_validity;         /* bit mask */
 134
 135         /*
 136          * read_cache_jiffies is when we started read-caching this inode.
 137          * attrtimeo is for how long the cached information is assumed
 138          * to be valid. A successful attribute revalidation doubles
 139          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 140          * acregmin/acdirmin.
 141          *
 142          * We need to revalidate the cached attrs for this inode if
 143          *
 144          *      jiffies - read_cache_jiffies >= attrtimeo
 145          *
 146          * Please note the comparison is greater than or equal
 147          * so that zero timeout values can be specified.
 148          */
 149         unsigned long           read_cache_jiffies;
 150         unsigned long           attrtimeo;
 151         unsigned long           attrtimeo_timestamp;
 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 #define NFS_INO_LAYOUTCOMMITTING (10)           /* layoutcommit inflight */
 233
 234 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 235 {
 236         return container_of(inode, struct nfs_inode, vfs_inode);
 237 }
 238
 239 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 240 {
 241         return (struct nfs_server *)(s->s_fs_info);
 242 }
 243
 244 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 245 {
 246         return &NFS_I(inode)->fh;
 247 }
 248
 249 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 250 {
 251         return NFS_SB(inode->i_sb);
 252 }
 253
 254 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 255 {
 256         return NFS_SERVER(inode)->client;
 257 }
 258
 259 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 260 {
 261         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 262 }
 263
 264 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
 265 {
 266         return NFS_I(inode)->cookieverf;
 267 }
 268
 269 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 270 {
 271         struct nfs_server *nfss = NFS_SERVER(inode);
 272         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 273 }
 274
 275 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 276 {
 277         struct nfs_server *nfss = NFS_SERVER(inode);
 278         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 279 }
 280
 281 static inline int NFS_STALE(const struct inode *inode)
 282 {
 283         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 284 }
 285
 286 static inline int NFS_FSCACHE(const struct inode *inode)
 287 {
 288         return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
 289 }
 290
 291 static inline __u64 NFS_FILEID(const struct inode *inode)
 292 {
 293         return NFS_I(inode)->fileid;
 294 }
 295
 296 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 297 {
 298         NFS_I(inode)->fileid = fileid;
 299 }
 300
 301 static inline void nfs_mark_for_revalidate(struct inode *inode)
 302 {
 303         struct nfs_inode *nfsi = NFS_I(inode);
 304
 305         spin_lock(&inode->i_lock);
 306         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 307         if (S_ISDIR(inode->i_mode))
 308                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 309         spin_unlock(&inode->i_lock);
 310 }
 311
 312 static inline int nfs_server_capable(struct inode *inode, int cap)
 313 {
 314         return NFS_SERVER(inode)->caps & cap;
 315 }
 316
 317 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 318 {
 319         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
 320 }
 321
 322 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 323 {
 324         dentry->d_time = verf;
 325 }
 326
 327 /**
 328  * nfs_save_change_attribute - Returns the inode attribute change cookie
 329  * @dir - pointer to parent directory inode
 330  * The "change attribute" is updated every time we finish an operation
 331  * that will result in a metadata change on the server.
 332  */
 333 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 334 {
 335         return NFS_I(dir)->cache_change_attribute;
 336 }
 337
 338 /**
 339  * nfs_verify_change_attribute - Detects NFS remote directory changes
 340  * @dir - pointer to parent directory inode
 341  * @chattr - previously saved change attribute
 342  * Return "false" if the verifiers doesn't match the change attribute.
 343  * This would usually indicate that the directory contents have changed on
 344  * the server, and that any dentries need revalidating.
 345  */
 346 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 347 {
 348         return chattr == NFS_I(dir)->cache_change_attribute;
 349 }
 350
 351 /*
 352  * linux/fs/nfs/inode.c
 353  */
 354 extern int nfs_sync_mapping(struct address_space *mapping);
 355 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 356 extern void nfs_zap_caches(struct inode *);
 357 extern void nfs_invalidate_atime(struct inode *);
 358 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 359                                 struct nfs_fattr *);
 360 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 361 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 362 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 363 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 364 extern int nfs_permission(struct inode *, int);
 365 extern int nfs_open(struct inode *, struct file *);
 366 extern int nfs_release(struct inode *, struct file *);
 367 extern int nfs_attribute_timeout(struct inode *inode);
 368 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 369 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 370 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 371 extern int nfs_setattr(struct dentry *, struct iattr *);
 372 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 373 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 374 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 375 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 376 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
 377 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 378 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 379 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
 380 extern u64 nfs_compat_user_ino64(u64 fileid);
 381 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 382 extern unsigned long nfs_inc_attr_generation_counter(void);
 383
 384 extern struct nfs_fattr *nfs_alloc_fattr(void);
 385
 386 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
 387 {
 388         kfree(fattr);
 389 }
 390
 391 extern struct nfs_fh *nfs_alloc_fhandle(void);
 392
 393 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 394 {
 395         kfree(fh);
 396 }
 397
 398 #ifdef RPC_DEBUG
 399 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
 400 #define nfs_display_fhandle(fh, caption)                        \
 401         do {                                                    \
 402                 if (unlikely(nfs_debug & NFSDBG_FACILITY))      \
 403                         _nfs_display_fhandle(fh, caption);      \
 404         } while (0)
 405 #else
 406 static inline 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 inode_operations nfs_file_inode_operations;
 423 #ifdef CONFIG_NFS_V3
 424 extern const struct inode_operations nfs3_file_inode_operations;
 425 #endif /* CONFIG_NFS_V3 */
 426 extern const struct file_operations nfs_file_operations;
 427 #ifdef CONFIG_NFS_V4
 428 extern const struct file_operations nfs4_file_operations;
 429 #endif /* CONFIG_NFS_V4 */
 430 extern const struct address_space_operations nfs_file_aops;
 431 extern const struct address_space_operations nfs_dir_aops;
 432
 433 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 434 {
 435         return filp->private_data;
 436 }
 437
 438 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 439 {
 440         if (file != NULL) {
 441                 struct nfs_open_context *ctx =
 442                         nfs_file_open_context(file);
 443                 if (ctx)
 444                         return ctx->cred;
 445         }
 446         return NULL;
 447 }
 448
 449 /*
 450  * linux/fs/nfs/xattr.c
 451  */
 452 #ifdef CONFIG_NFS_V3_ACL
 453 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 454 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 455 extern int nfs3_setxattr(struct dentry *, const char *,
 456                         const void *, size_t, int);
 457 extern int nfs3_removexattr (struct dentry *, const char *name);
 458 #else
 459 # define nfs3_listxattr NULL
 460 # define nfs3_getxattr NULL
 461 # define nfs3_setxattr NULL
 462 # define nfs3_removexattr NULL
 463 #endif
 464
 465 /*
 466  * linux/fs/nfs/direct.c
 467  */
 468 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 469                         unsigned long);
 470 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 471                         const struct iovec *iov, unsigned long nr_segs,
 472                         loff_t pos);
 473 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 474                         const struct iovec *iov, unsigned long nr_segs,
 475                         loff_t pos);
 476
 477 /*
 478  * linux/fs/nfs/dir.c
 479  */
 480 extern const struct inode_operations nfs_dir_inode_operations;
 481 #ifdef CONFIG_NFS_V3
 482 extern const struct inode_operations nfs3_dir_inode_operations;
 483 #endif /* CONFIG_NFS_V3 */
 484 extern const struct file_operations nfs_dir_operations;
 485 extern const struct dentry_operations nfs_dentry_operations;
 486
 487 extern void nfs_force_lookup_revalidate(struct inode *dir);
 488 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 489 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 490 extern void nfs_access_zap_cache(struct inode *inode);
 491
 492 /*
 493  * linux/fs/nfs/symlink.c
 494  */
 495 extern const struct inode_operations nfs_symlink_inode_operations;
 496
 497 /*
 498  * linux/fs/nfs/sysctl.c
 499  */
 500 #ifdef CONFIG_SYSCTL
 501 extern int nfs_register_sysctl(void);
 502 extern void nfs_unregister_sysctl(void);
 503 #else
 504 #define nfs_register_sysctl() 0
 505 #define nfs_unregister_sysctl() do { } while(0)
 506 #endif
 507
 508 /*
 509  * linux/fs/nfs/namespace.c
 510  */
 511 extern const struct inode_operations nfs_mountpoint_inode_operations;
 512 extern const struct inode_operations nfs_referral_inode_operations;
 513 extern int nfs_mountpoint_expiry_timeout;
 514 extern void nfs_release_automount_timer(void);
 515
 516 /*
 517  * linux/fs/nfs/unlink.c
 518  */
 519 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 520 extern void nfs_block_sillyrename(struct dentry *dentry);
 521 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 522 extern int  nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 523
 524 /*
 525  * linux/fs/nfs/write.c
 526  */
 527 extern int  nfs_congestion_kb;
 528 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 529 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 530 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 531 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 532 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 533
 534 /*
 535  * Try to write back everything synchronously (but check the
 536  * return value!)
 537  */
 538 extern int nfs_wb_all(struct inode *inode);
 539 extern int nfs_wb_page(struct inode *inode, struct page* page);
 540 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 541 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 542 extern int  nfs_commit_inode(struct inode *, int);
 543 extern struct nfs_write_data *nfs_commitdata_alloc(void);
 544 extern void nfs_commit_free(struct nfs_write_data *wdata);
 545 #else
 546 static inline int
 547 nfs_commit_inode(struct inode *inode, int how)
 548 {
 549         return 0;
 550 }
 551 #endif
 552
 553 static inline int
 554 nfs_have_writebacks(struct inode *inode)
 555 {
 556         return NFS_I(inode)->npages != 0;
 557 }
 558
 559 /*
 560  * Allocate nfs_write_data structures
 561  */
 562 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 563 extern void nfs_writedata_free(struct nfs_write_data *);
 564
 565 /*
 566  * linux/fs/nfs/read.c
 567  */
 568 extern int  nfs_readpage(struct file *, struct page *);
 569 extern int  nfs_readpages(struct file *, struct address_space *,
 570                 struct list_head *, unsigned);
 571 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 572 extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
 573                                struct page *);
 574
 575 /*
 576  * Allocate nfs_read_data structures
 577  */
 578 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 579 extern void nfs_readdata_free(struct nfs_read_data *);
 580
 581 /*
 582  * linux/fs/nfs3proc.c
 583  */
 584 #ifdef CONFIG_NFS_V3_ACL
 585 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 586 extern int nfs3_proc_setacl(struct inode *inode, int type,
 587                             struct posix_acl *acl);
 588 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 589                 umode_t mode);
 590 extern void nfs3_forget_cached_acls(struct inode *inode);
 591 #else
 592 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 593                                             struct inode *inode,
 594                                             umode_t mode)
 595 {
 596         return 0;
 597 }
 598
 599 static inline void nfs3_forget_cached_acls(struct inode *inode)
 600 {
 601 }
 602 #endif /* CONFIG_NFS_V3_ACL */
 603
 604 /*
 605  * inline functions
 606  */
 607
 608 static inline loff_t nfs_size_to_loff_t(__u64 size)
 609 {
 610         if (size > (__u64) OFFSET_MAX - 1)
 611                 return OFFSET_MAX - 1;
 612         return (loff_t) size;
 613 }
 614
 615 static inline ino_t
 616 nfs_fileid_to_ino_t(u64 fileid)
 617 {
 618         ino_t ino = (ino_t) fileid;
 619         if (sizeof(ino_t) < sizeof(u64))
 620                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 621         return ino;
 622 }
 623
 624 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 625
 626 #endif /* __KERNEL__ */
 627
 628 /*
 629  * NFS debug flags
 630  */
 631 #define NFSDBG_VFS              0x0001
 632 #define NFSDBG_DIRCACHE         0x0002
 633 #define NFSDBG_LOOKUPCACHE      0x0004
 634 #define NFSDBG_PAGECACHE        0x0008
 635 #define NFSDBG_PROC             0x0010
 636 #define NFSDBG_XDR              0x0020
 637 #define NFSDBG_FILE             0x0040
 638 #define NFSDBG_ROOT             0x0080
 639 #define NFSDBG_CALLBACK         0x0100
 640 #define NFSDBG_CLIENT           0x0200
 641 #define NFSDBG_MOUNT            0x0400
 642 #define NFSDBG_FSCACHE          0x0800
 643 #define NFSDBG_PNFS             0x1000
 644 #define NFSDBG_PNFS_LD          0x2000
 645 #define NFSDBG_ALL              0xFFFF
 646
 647 #ifdef __KERNEL__
 648
 649 /*
 650  * Enable debugging support for nfs client.
 651  * Requires RPC_DEBUG.
 652  */
 653 #ifdef RPC_DEBUG
 654 # define NFS_DEBUG
 655 #endif
 656
 657 # undef ifdebug
 658 # ifdef NFS_DEBUG
 659 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 660 # else
 661 #  define ifdebug(fac)          if (0)
 662 # endif
 663 #endif /* __KERNEL */
 664
 665 #endif