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/config.h>
  13 #include <linux/in.h>
  14 #include <linux/mm.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/rwsem.h>
  17 #include <linux/wait.h>
  18 #include <linux/uio.h>
  19
  20 #include <linux/nfs_fs_sb.h>
  21
  22 #include <linux/sunrpc/debug.h>
  23 #include <linux/sunrpc/auth.h>
  24 #include <linux/sunrpc/clnt.h>
  25
  26 #include <linux/nfs.h>
  27 #include <linux/nfs2.h>
  28 #include <linux/nfs3.h>
  29 #include <linux/nfs4.h>
  30 #include <linux/nfs_xdr.h>
  31 #include <linux/rwsem.h>
  32 #include <linux/workqueue.h>
  33
  34 /*
  35  * Enable debugging support for nfs client.
  36  * Requires RPC_DEBUG.
  37  */
  38 #ifdef RPC_DEBUG
  39 # define NFS_DEBUG
  40 #endif
  41
  42 #define NFS_MAX_FILE_IO_BUFFER_SIZE     32768
  43 #define NFS_DEF_FILE_IO_BUFFER_SIZE     4096
  44
  45 /*
  46  * The upper limit on timeouts for the exponential backoff algorithm.
  47  */
  48 #define NFS_WRITEBACK_DELAY             (5*HZ)
  49 #define NFS_WRITEBACK_LOCKDELAY         (60*HZ)
  50 #define NFS_COMMIT_DELAY                (5*HZ)
  51
  52 /*
  53  * superblock magic number for NFS
  54  */
  55 #define NFS_SUPER_MAGIC                 0x6969
  56
  57 /*
  58  * These are the default flags for swap requests
  59  */
  60 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  61
  62 #define NFS_RW_SYNC             0x0001  /* O_SYNC handling */
  63 #define NFS_RW_SWAP             0x0002  /* This is a swap request */
  64
  65 /*
  66  * When flushing a cluster of dirty pages, there can be different
  67  * strategies:
  68  */
  69 #define FLUSH_AGING             0       /* only flush old buffers */
  70 #define FLUSH_SYNC              1       /* file being synced, or contention */
  71 #define FLUSH_WAIT              2       /* wait for completion */
  72 #define FLUSH_STABLE            4       /* commit to stable storage */
  73 #define FLUSH_LOWPRI            8       /* low priority background flush */
  74 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  75
  76 #ifdef __KERNEL__
  77
  78 /*
  79  * NFSv3/v4 Access mode cache entry
  80  */
  81 struct nfs_access_entry {
  82         unsigned long           jiffies;
  83         struct rpc_cred *       cred;
  84         int                     mask;
  85 };
  86
  87 struct nfs4_state;
  88 struct nfs_open_context {
  89         atomic_t count;
  90         struct dentry *dentry;
  91         struct rpc_cred *cred;
  92         struct nfs4_state *state;
  93         fl_owner_t lockowner;
  94         int mode;
  95         int error;
  96
  97         struct list_head list;
  98         wait_queue_head_t waitq;
  99 };
 100
 101 /*
 102  * NFSv4 delegation
 103  */
 104 struct nfs_delegation;
 105
 106 /*
 107  * nfs fs inode data in memory
 108  */
 109 struct nfs_inode {
 110         /*
 111          * The 64bit 'inode number'
 112          */
 113         __u64 fileid;
 114
 115         /*
 116          * NFS file handle
 117          */
 118         struct nfs_fh           fh;
 119
 120         /*
 121          * Various flags
 122          */
 123         unsigned int            flags;
 124
 125         /*
 126          * read_cache_jiffies is when we started read-caching this inode,
 127          * and read_cache_mtime is the mtime of the inode at that time.
 128          * attrtimeo is for how long the cached information is assumed
 129          * to be valid. A successful attribute revalidation doubles
 130          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 131          * acregmin/acdirmin.
 132          *
 133          * We need to revalidate the cached attrs for this inode if
 134          *
 135          *      jiffies - read_cache_jiffies > attrtimeo
 136          *
 137          * and invalidate any cached data/flush out any dirty pages if
 138          * we find that
 139          *
 140          *      mtime != read_cache_mtime
 141          */
 142         unsigned long           readdir_timestamp;
 143         unsigned long           read_cache_jiffies;
 144         unsigned long           attrtimeo;
 145         unsigned long           attrtimeo_timestamp;
 146         __u64                   change_attr;            /* v4 only */
 147
 148         /* "Generation counter" for the attribute cache. This is
 149          * bumped whenever we update the metadata on the
 150          * server.
 151          */
 152         unsigned long           cache_change_attribute;
 153         /*
 154          * Counter indicating the number of outstanding requests that
 155          * will cause a file data update.
 156          */
 157         atomic_t                data_updates;
 158
 159         struct nfs_access_entry cache_access;
 160
 161         /*
 162          * This is the cookie verifier used for NFSv3 readdir
 163          * operations
 164          */
 165         __u32                   cookieverf[2];
 166
 167         /*
 168          * This is the list of dirty unwritten pages.
 169          */
 170         spinlock_t              req_lock;
 171         struct list_head        dirty;
 172         struct list_head        commit;
 173         struct radix_tree_root  nfs_page_tree;
 174
 175         unsigned int            ndirty,
 176                                 ncommit,
 177                                 npages;
 178
 179         /* Open contexts for shared mmap writes */
 180         struct list_head        open_files;
 181
 182         wait_queue_head_t       nfs_i_wait;
 183
 184 #ifdef CONFIG_NFS_V4
 185         /* NFSv4 state */
 186         struct list_head        open_states;
 187         struct nfs_delegation   *delegation;
 188         int                      delegation_state;
 189         struct rw_semaphore     rwsem;
 190 #endif /* CONFIG_NFS_V4*/
 191
 192         struct inode            vfs_inode;
 193 };
 194
 195 /*
 196  * Legal inode flag values
 197  */
 198 #define NFS_INO_STALE           0x0001          /* possible stale inode */
 199 #define NFS_INO_ADVISE_RDPLUS   0x0002          /* advise readdirplus */
 200 #define NFS_INO_REVALIDATING    0x0004          /* revalidating attrs */
 201 #define NFS_INO_INVALID_ATTR    0x0008          /* cached attrs are invalid */
 202 #define NFS_INO_INVALID_DATA    0x0010          /* cached data is invalid */
 203 #define NFS_INO_INVALID_ATIME   0x0020          /* cached atime is invalid */
 204
 205 static inline struct nfs_inode *NFS_I(struct inode *inode)
 206 {
 207         return container_of(inode, struct nfs_inode, vfs_inode);
 208 }
 209 #define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))
 210
 211 #define NFS_FH(inode)                   (&NFS_I(inode)->fh)
 212 #define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
 213 #define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
 214 #define NFS_PROTO(inode)                (NFS_SERVER(inode)->rpc_ops)
 215 #define NFS_ADDR(inode)                 (RPC_PEERADDR(NFS_CLIENT(inode)))
 216 #define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
 217 #define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
 218 #define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
 219 #define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
 220 #define NFS_MINATTRTIMEO(inode) \
 221         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 222                                : NFS_SERVER(inode)->acregmin)
 223 #define NFS_MAXATTRTIMEO(inode) \
 224         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 225                                : NFS_SERVER(inode)->acregmax)
 226 #define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)
 227
 228 #define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
 229 #define NFS_REVALIDATING(inode)         (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
 230 #define NFS_STALE(inode)                (NFS_FLAGS(inode) & NFS_INO_STALE)
 231
 232 #define NFS_FILEID(inode)               (NFS_I(inode)->fileid)
 233
 234 static inline int nfs_caches_unstable(struct inode *inode)
 235 {
 236         return atomic_read(&NFS_I(inode)->data_updates) != 0;
 237 }
 238
 239 static inline void NFS_CACHEINV(struct inode *inode)
 240 {
 241         if (!nfs_caches_unstable(inode))
 242                 NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR;
 243 }
 244
 245 static inline int nfs_server_capable(struct inode *inode, int cap)
 246 {
 247         return NFS_SERVER(inode)->caps & cap;
 248 }
 249
 250 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 251 {
 252         return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
 253 }
 254
 255 static inline
 256 loff_t page_offset(struct page *page)
 257 {
 258         return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
 259 }
 260
 261 /**
 262  * nfs_save_change_attribute - Returns the inode attribute change cookie
 263  * @inode - pointer to inode
 264  * The "change attribute" is updated every time we finish an operation
 265  * that will result in a metadata change on the server.
 266  */
 267 static inline long nfs_save_change_attribute(struct inode *inode)
 268 {
 269         return NFS_I(inode)->cache_change_attribute;
 270 }
 271
 272 /**
 273  * nfs_verify_change_attribute - Detects NFS inode cache updates
 274  * @inode - pointer to inode
 275  * @chattr - previously saved change attribute
 276  * Return "false" if metadata has been updated (or is in the process of
 277  * being updated) since the change attribute was saved.
 278  */
 279 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 280 {
 281         return !nfs_caches_unstable(inode)
 282                 && chattr == NFS_I(inode)->cache_change_attribute;
 283 }
 284
 285 /*
 286  * linux/fs/nfs/inode.c
 287  */
 288 extern void nfs_zap_caches(struct inode *);
 289 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 290                                 struct nfs_fattr *);
 291 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 292 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 293 extern int nfs_permission(struct inode *, int, struct nameidata *);
 294 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
 295 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 296 extern int nfs_open(struct inode *, struct file *);
 297 extern int nfs_release(struct inode *, struct file *);
 298 extern int nfs_attribute_timeout(struct inode *inode);
 299 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 300 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 301 extern int nfs_setattr(struct dentry *, struct iattr *);
 302 extern void nfs_begin_attr_update(struct inode *);
 303 extern void nfs_end_attr_update(struct inode *);
 304 extern void nfs_begin_data_update(struct inode *);
 305 extern void nfs_end_data_update(struct inode *);
 306 extern void nfs_end_data_update_defer(struct inode *);
 307 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
 308 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 309 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 310 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 311 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
 312 extern void nfs_file_clear_open_context(struct file *filp);
 313
 314 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 315 extern u32 root_nfs_parse_addr(char *name); /*__init*/
 316
 317 /*
 318  * linux/fs/nfs/file.c
 319  */
 320 extern struct inode_operations nfs_file_inode_operations;
 321 extern struct file_operations nfs_file_operations;
 322 extern struct address_space_operations nfs_file_aops;
 323
 324 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 325 {
 326         if (file != NULL) {
 327                 struct nfs_open_context *ctx;
 328
 329                 ctx = (struct nfs_open_context*)file->private_data;
 330                 return ctx->cred;
 331         }
 332         return NULL;
 333 }
 334
 335 /*
 336  * linux/fs/nfs/direct.c
 337  */
 338 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 339                         unsigned long);
 340 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
 341                         size_t count, loff_t pos);
 342 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
 343                         size_t count, loff_t pos);
 344
 345 /*
 346  * linux/fs/nfs/dir.c
 347  */
 348 extern struct inode_operations nfs_dir_inode_operations;
 349 extern struct file_operations nfs_dir_operations;
 350 extern struct dentry_operations nfs_dentry_operations;
 351
 352 /*
 353  * linux/fs/nfs/symlink.c
 354  */
 355 extern struct inode_operations nfs_symlink_inode_operations;
 356
 357 /*
 358  * linux/fs/nfs/locks.c
 359  */
 360 extern int nfs_lock(struct file *, int, struct file_lock *);
 361
 362 /*
 363  * linux/fs/nfs/unlink.c
 364  */
 365 extern int  nfs_async_unlink(struct dentry *);
 366 extern void nfs_complete_unlink(struct dentry *);
 367
 368 /*
 369  * linux/fs/nfs/write.c
 370  */
 371 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 372 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 373 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 374 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 375 extern void nfs_writeback_done(struct rpc_task *task);
 376
 377 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 378 extern void nfs_commit_done(struct rpc_task *);
 379 #endif
 380
 381 /*
 382  * Try to write back everything synchronously (but check the
 383  * return value!)
 384  */
 385 extern int  nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
 386 extern int  nfs_flush_inode(struct inode *, unsigned long, unsigned int, int);
 387 extern int  nfs_flush_list(struct list_head *, int, int);
 388 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 389 extern int  nfs_commit_inode(struct inode *, unsigned long, unsigned int, int);
 390 extern int  nfs_commit_list(struct list_head *, int);
 391 #else
 392 static inline int
 393 nfs_commit_inode(struct inode *inode, unsigned long idx_start, unsigned int npages, int how)
 394 {
 395         return 0;
 396 }
 397 #endif
 398
 399 static inline int
 400 nfs_have_writebacks(struct inode *inode)
 401 {
 402         return NFS_I(inode)->npages != 0;
 403 }
 404
 405 static inline int
 406 nfs_wb_all(struct inode *inode)
 407 {
 408         int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
 409         return (error < 0) ? error : 0;
 410 }
 411
 412 /*
 413  * Write back all requests on one page - we do this before reading it.
 414  */
 415 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
 416 {
 417         int error = nfs_sync_inode(inode, page->index, 1,
 418                         how | FLUSH_WAIT | FLUSH_STABLE);
 419         return (error < 0) ? error : 0;
 420 }
 421
 422 static inline int nfs_wb_page(struct inode *inode, struct page* page)
 423 {
 424         return nfs_wb_page_priority(inode, page, 0);
 425 }
 426
 427 /* Hack for future NFS swap support */
 428 #ifndef IS_SWAPFILE
 429 # define IS_SWAPFILE(inode)     (0)
 430 #endif
 431
 432 /*
 433  * linux/fs/nfs/read.c
 434  */
 435 extern int  nfs_readpage(struct file *, struct page *);
 436 extern int  nfs_readpages(struct file *, struct address_space *,
 437                 struct list_head *, unsigned);
 438 extern int  nfs_pagein_list(struct list_head *, int);
 439 extern void nfs_readpage_result(struct rpc_task *);
 440
 441 /*
 442  * linux/fs/mount_clnt.c
 443  * (Used only by nfsroot module)
 444  */
 445 extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
 446                 int, int);
 447
 448 /*
 449  * inline functions
 450  */
 451
 452 static inline loff_t
 453 nfs_size_to_loff_t(__u64 size)
 454 {
 455         loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
 456         if (size > maxsz)
 457                 return maxsz;
 458         return (loff_t) size;
 459 }
 460
 461 static inline ino_t
 462 nfs_fileid_to_ino_t(u64 fileid)
 463 {
 464         ino_t ino = (ino_t) fileid;
 465         if (sizeof(ino_t) < sizeof(u64))
 466                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 467         return ino;
 468 }
 469
 470 /* NFS root */
 471
 472 extern void * nfs_root_data(void);
 473
 474 #define nfs_wait_event(clnt, wq, condition)                             \
 475 ({                                                                      \
 476         int __retval = 0;                                               \
 477         if (clnt->cl_intr) {                                            \
 478                 sigset_t oldmask;                                       \
 479                 rpc_clnt_sigmask(clnt, &oldmask);                       \
 480                 __retval = wait_event_interruptible(wq, condition);     \
 481                 rpc_clnt_sigunmask(clnt, &oldmask);                     \
 482         } else                                                          \
 483                 wait_event(wq, condition);                              \
 484         __retval;                                                       \
 485 })
 486
 487 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 488
 489 #ifdef CONFIG_NFS_V4
 490
 491 struct idmap;
 492
 493 /*
 494  * In a seqid-mutating op, this macro controls which error return
 495  * values trigger incrementation of the seqid.
 496  *
 497  * from rfc 3010:
 498  * The client MUST monotonically increment the sequence number for the
 499  * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
 500  * operations.  This is true even in the event that the previous
 501  * operation that used the sequence number received an error.  The only
 502  * exception to this rule is if the previous operation received one of
 503  * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
 504  * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
 505  * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
 506  *
 507  */
 508 #define seqid_mutating_err(err)       \
 509 (((err) != NFSERR_STALE_CLIENTID) &&  \
 510  ((err) != NFSERR_STALE_STATEID)  &&  \
 511  ((err) != NFSERR_BAD_STATEID)    &&  \
 512  ((err) != NFSERR_BAD_SEQID)      &&  \
 513  ((err) != NFSERR_BAD_XDR)        &&  \
 514  ((err) != NFSERR_RESOURCE)       &&  \
 515  ((err) != NFSERR_NOFILEHANDLE))
 516
 517 enum nfs4_client_state {
 518         NFS4CLNT_OK  = 0,
 519 };
 520
 521 /*
 522  * The nfs4_client identifies our client state to the server.
 523  */
 524 struct nfs4_client {
 525         struct list_head        cl_servers;     /* Global list of servers */
 526         struct in_addr          cl_addr;        /* Server identifier */
 527         u64                     cl_clientid;    /* constant */
 528         nfs4_verifier           cl_confirm;
 529         unsigned long           cl_state;
 530
 531         u32                     cl_lockowner_id;
 532
 533         /*
 534          * The following rwsem ensures exclusive access to the server
 535          * while we recover the state following a lease expiration.
 536          */
 537         struct rw_semaphore     cl_sem;
 538
 539         struct list_head        cl_delegations;
 540         struct list_head        cl_state_owners;
 541         struct list_head        cl_unused;
 542         int                     cl_nunused;
 543         spinlock_t              cl_lock;
 544         atomic_t                cl_count;
 545
 546         struct rpc_clnt *       cl_rpcclient;
 547         struct rpc_cred *       cl_cred;
 548
 549         struct list_head        cl_superblocks; /* List of nfs_server structs */
 550
 551         unsigned long           cl_lease_time;
 552         unsigned long           cl_last_renewal;
 553         struct work_struct      cl_renewd;
 554         struct work_struct      cl_recoverd;
 555
 556         wait_queue_head_t       cl_waitq;
 557         struct rpc_wait_queue   cl_rpcwaitq;
 558
 559         /* idmapper */
 560         struct idmap *          cl_idmap;
 561
 562         /* Our own IP address, as a null-terminated string.
 563          * This is used to generate the clientid, and the callback address.
 564          */
 565         char                    cl_ipaddr[16];
 566 };
 567
 568 /*
 569  * NFS4 state_owners and lock_owners are simply labels for ordered
 570  * sequences of RPC calls. Their sole purpose is to provide once-only
 571  * semantics by allowing the server to identify replayed requests.
 572  *
 573  * The ->so_sema is held during all state_owner seqid-mutating operations:
 574  * OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
 575  * so_seqid.
 576  */
 577 struct nfs4_state_owner {
 578         struct list_head     so_list;    /* per-clientid list of state_owners */
 579         struct nfs4_client   *so_client;
 580         u32                  so_id;      /* 32-bit identifier, unique */
 581         struct semaphore     so_sema;
 582         u32                  so_seqid;   /* protected by so_sema */
 583         atomic_t             so_count;
 584
 585         struct rpc_cred      *so_cred;   /* Associated cred */
 586         struct list_head     so_states;
 587         struct list_head     so_delegations;
 588 };
 589
 590 /*
 591  * struct nfs4_state maintains the client-side state for a given
 592  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 593  *
 594  * OPEN:
 595  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 596  * we need to know how many files are open for reading or writing on a
 597  * given inode. This information too is stored here.
 598  *
 599  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 600  */
 601
 602 struct nfs4_lock_state {
 603         struct list_head        ls_locks;       /* Other lock stateids */
 604         fl_owner_t              ls_owner;       /* POSIX lock owner */
 605 #define NFS_LOCK_INITIALIZED 1
 606         int                     ls_flags;
 607         u32                     ls_seqid;
 608         u32                     ls_id;
 609         nfs4_stateid            ls_stateid;
 610         atomic_t                ls_count;
 611 };
 612
 613 /* bits for nfs4_state->flags */
 614 enum {
 615         LK_STATE_IN_USE,
 616         NFS_DELEGATED_STATE,
 617 };
 618
 619 struct nfs4_state {
 620         struct list_head open_states;   /* List of states for the same state_owner */
 621         struct list_head inode_states;  /* List of states for the same inode */
 622         struct list_head lock_states;   /* List of subservient lock stateids */
 623
 624         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 625         struct inode *inode;            /* Pointer to the inode */
 626
 627         unsigned long flags;            /* Do we hold any locks? */
 628         struct semaphore lock_sema;     /* Serializes file locking operations */
 629         rwlock_t state_lock;            /* Protects the lock_states list */
 630
 631         nfs4_stateid stateid;
 632
 633         unsigned int nreaders;
 634         unsigned int nwriters;
 635         int state;                      /* State on the server (R,W, or RW) */
 636         atomic_t count;
 637 };
 638
 639
 640 struct nfs4_exception {
 641         long timeout;
 642         int retry;
 643 };
 644
 645 extern struct dentry_operations nfs4_dentry_operations;
 646 extern struct inode_operations nfs4_dir_inode_operations;
 647
 648 /* nfs4proc.c */
 649 extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
 650 extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
 651 extern int nfs4_open_reclaim(struct nfs4_state_owner *, struct nfs4_state *);
 652 extern int nfs4_proc_async_renew(struct nfs4_client *);
 653 extern int nfs4_proc_renew(struct nfs4_client *);
 654 extern int nfs4_do_close(struct inode *, struct nfs4_state *);
 655 extern int nfs4_do_downgrade(struct inode *inode, struct nfs4_state *state, mode_t mode);
 656 extern int nfs4_wait_clnt_recover(struct rpc_clnt *, struct nfs4_client *);
 657 extern struct inode *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
 658 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int);
 659 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 660 extern int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request);
 661
 662 /* nfs4renewd.c */
 663 extern void nfs4_schedule_state_renewal(struct nfs4_client *);
 664 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 665 extern void nfs4_kill_renewd(struct nfs4_client *);
 666
 667 /* nfs4state.c */
 668 extern void init_nfsv4_state(struct nfs_server *);
 669 extern void destroy_nfsv4_state(struct nfs_server *);
 670 extern struct nfs4_client *nfs4_get_client(struct in_addr *);
 671 extern void nfs4_put_client(struct nfs4_client *clp);
 672 extern int nfs4_init_client(struct nfs4_client *clp);
 673 extern struct nfs4_client *nfs4_find_client(struct in_addr *);
 674 extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);
 675
 676 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 677 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 678 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 679 extern void nfs4_put_open_state(struct nfs4_state *);
 680 extern void nfs4_close_state(struct nfs4_state *, mode_t);
 681 extern struct nfs4_state *nfs4_find_state(struct inode *, struct rpc_cred *, mode_t mode);
 682 extern void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp);
 683 extern void nfs4_schedule_state_recovery(struct nfs4_client *);
 684 extern struct nfs4_lock_state *nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t);
 685 extern struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t);
 686 extern void nfs4_put_lock_state(struct nfs4_lock_state *state);
 687 extern void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *ls);
 688 extern void nfs4_notify_setlk(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
 689 extern void nfs4_notify_unlck(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
 690 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
 691
 692
 693
 694 struct nfs4_mount_data;
 695 #else
 696 #define init_nfsv4_state(server)  do { } while (0)
 697 #define destroy_nfsv4_state(server)       do { } while (0)
 698 #define nfs4_put_state_owner(inode, owner) do { } while (0)
 699 #define nfs4_put_open_state(state) do { } while (0)
 700 #define nfs4_close_state(a, b) do { } while (0)
 701 #define nfs4_renewd_prepare_shutdown(server) do { } while (0)
 702 #endif
 703
 704 #endif /* __KERNEL__ */
 705
 706 /*
 707  * NFS debug flags
 708  */
 709 #define NFSDBG_VFS              0x0001
 710 #define NFSDBG_DIRCACHE         0x0002
 711 #define NFSDBG_LOOKUPCACHE      0x0004
 712 #define NFSDBG_PAGECACHE        0x0008
 713 #define NFSDBG_PROC             0x0010
 714 #define NFSDBG_XDR              0x0020
 715 #define NFSDBG_FILE             0x0040
 716 #define NFSDBG_ROOT             0x0080
 717 #define NFSDBG_CALLBACK         0x0100
 718 #define NFSDBG_ALL              0xFFFF
 719
 720 #ifdef __KERNEL__
 721 # undef ifdebug
 722 # ifdef NFS_DEBUG
 723 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 724 # else
 725 #  define ifdebug(fac)          if (0)
 726 # endif
 727 #endif /* __KERNEL */
 728
 729 #endif