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 #include <linux/mempool.h>
  34
  35 /*
  36  * Enable debugging support for nfs client.
  37  * Requires RPC_DEBUG.
  38  */
  39 #ifdef RPC_DEBUG
  40 # define NFS_DEBUG
  41 #endif
  42
  43 #define NFS_MAX_FILE_IO_BUFFER_SIZE     32768
  44 #define NFS_DEF_FILE_IO_BUFFER_SIZE     4096
  45
  46 /*
  47  * The upper limit on timeouts for the exponential backoff algorithm.
  48  */
  49 #define NFS_WRITEBACK_DELAY             (5*HZ)
  50 #define NFS_WRITEBACK_LOCKDELAY         (60*HZ)
  51 #define NFS_COMMIT_DELAY                (5*HZ)
  52
  53 /*
  54  * superblock magic number for NFS
  55  */
  56 #define NFS_SUPER_MAGIC                 0x6969
  57
  58 /*
  59  * These are the default flags for swap requests
  60  */
  61 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  62
  63 #define NFS_RW_SYNC             0x0001  /* O_SYNC handling */
  64 #define NFS_RW_SWAP             0x0002  /* This is a swap request */
  65
  66 /*
  67  * When flushing a cluster of dirty pages, there can be different
  68  * strategies:
  69  */
  70 #define FLUSH_AGING             0       /* only flush old buffers */
  71 #define FLUSH_SYNC              1       /* file being synced, or contention */
  72 #define FLUSH_WAIT              2       /* wait for completion */
  73 #define FLUSH_STABLE            4       /* commit to stable storage */
  74 #define FLUSH_LOWPRI            8       /* low priority background flush */
  75 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  76
  77 #ifdef __KERNEL__
  78
  79 /*
  80  * NFSv3/v4 Access mode cache entry
  81  */
  82 struct nfs_access_entry {
  83         unsigned long           jiffies;
  84         struct rpc_cred *       cred;
  85         int                     mask;
  86 };
  87
  88 struct nfs4_state;
  89 struct nfs_open_context {
  90         atomic_t count;
  91         struct dentry *dentry;
  92         struct rpc_cred *cred;
  93         struct nfs4_state *state;
  94         fl_owner_t lockowner;
  95         int mode;
  96         int error;
  97
  98         struct list_head list;
  99         wait_queue_head_t waitq;
 100 };
 101
 102 /*
 103  * NFSv4 delegation
 104  */
 105 struct nfs_delegation;
 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 int            flags;
 125
 126         /*
 127          * read_cache_jiffies is when we started read-caching this inode,
 128          * and read_cache_mtime is the mtime of the inode at that time.
 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          * and invalidate any cached data/flush out any dirty pages if
 139          * we find that
 140          *
 141          *      mtime != read_cache_mtime
 142          */
 143         unsigned long           readdir_timestamp;
 144         unsigned long           read_cache_jiffies;
 145         unsigned long           attrtimeo;
 146         unsigned long           attrtimeo_timestamp;
 147         __u64                   change_attr;            /* v4 only */
 148
 149         /* "Generation counter" for the attribute cache. This is
 150          * bumped whenever we update the metadata on the
 151          * server.
 152          */
 153         unsigned long           cache_change_attribute;
 154         /*
 155          * Counter indicating the number of outstanding requests that
 156          * will cause a file data update.
 157          */
 158         atomic_t                data_updates;
 159
 160         struct nfs_access_entry cache_access;
 161
 162         /*
 163          * This is the cookie verifier used for NFSv3 readdir
 164          * operations
 165          */
 166         __u32                   cookieverf[2];
 167
 168         /*
 169          * This is the list of dirty unwritten pages.
 170          */
 171         spinlock_t              req_lock;
 172         struct list_head        dirty;
 173         struct list_head        commit;
 174         struct radix_tree_root  nfs_page_tree;
 175
 176         unsigned int            ndirty,
 177                                 ncommit,
 178                                 npages;
 179
 180         /* Open contexts for shared mmap writes */
 181         struct list_head        open_files;
 182
 183         wait_queue_head_t       nfs_i_wait;
 184
 185 #ifdef CONFIG_NFS_V4
 186         /* NFSv4 state */
 187         struct list_head        open_states;
 188         struct nfs_delegation   *delegation;
 189         int                      delegation_state;
 190         struct rw_semaphore     rwsem;
 191 #endif /* CONFIG_NFS_V4*/
 192
 193         struct inode            vfs_inode;
 194 };
 195
 196 /*
 197  * Legal inode flag values
 198  */
 199 #define NFS_INO_STALE           0x0001          /* possible stale inode */
 200 #define NFS_INO_ADVISE_RDPLUS   0x0002          /* advise readdirplus */
 201 #define NFS_INO_REVALIDATING    0x0004          /* revalidating attrs */
 202 #define NFS_INO_INVALID_ATTR    0x0008          /* cached attrs are invalid */
 203 #define NFS_INO_INVALID_DATA    0x0010          /* cached data is invalid */
 204 #define NFS_INO_INVALID_ATIME   0x0020          /* cached atime is invalid */
 205 #define NFS_INO_INVALID_ACCESS  0x0040          /* cached access cred invalid */
 206
 207 static inline struct nfs_inode *NFS_I(struct inode *inode)
 208 {
 209         return container_of(inode, struct nfs_inode, vfs_inode);
 210 }
 211 #define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))
 212
 213 #define NFS_FH(inode)                   (&NFS_I(inode)->fh)
 214 #define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
 215 #define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
 216 #define NFS_PROTO(inode)                (NFS_SERVER(inode)->rpc_ops)
 217 #define NFS_ADDR(inode)                 (RPC_PEERADDR(NFS_CLIENT(inode)))
 218 #define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
 219 #define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
 220 #define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
 221 #define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
 222 #define NFS_MINATTRTIMEO(inode) \
 223         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 224                                : NFS_SERVER(inode)->acregmin)
 225 #define NFS_MAXATTRTIMEO(inode) \
 226         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 227                                : NFS_SERVER(inode)->acregmax)
 228 #define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)
 229
 230 #define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
 231 #define NFS_REVALIDATING(inode)         (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
 232 #define NFS_STALE(inode)                (NFS_FLAGS(inode) & NFS_INO_STALE)
 233
 234 #define NFS_FILEID(inode)               (NFS_I(inode)->fileid)
 235
 236 static inline int nfs_caches_unstable(struct inode *inode)
 237 {
 238         return atomic_read(&NFS_I(inode)->data_updates) != 0;
 239 }
 240
 241 static inline void NFS_CACHEINV(struct inode *inode)
 242 {
 243         if (!nfs_caches_unstable(inode))
 244                 NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
 245 }
 246
 247 static inline int nfs_server_capable(struct inode *inode, int cap)
 248 {
 249         return NFS_SERVER(inode)->caps & cap;
 250 }
 251
 252 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 253 {
 254         return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
 255 }
 256
 257 /**
 258  * nfs_save_change_attribute - Returns the inode attribute change cookie
 259  * @inode - pointer to inode
 260  * The "change attribute" is updated every time we finish an operation
 261  * that will result in a metadata change on the server.
 262  */
 263 static inline long nfs_save_change_attribute(struct inode *inode)
 264 {
 265         return NFS_I(inode)->cache_change_attribute;
 266 }
 267
 268 /**
 269  * nfs_verify_change_attribute - Detects NFS inode cache updates
 270  * @inode - pointer to inode
 271  * @chattr - previously saved change attribute
 272  * Return "false" if metadata has been updated (or is in the process of
 273  * being updated) since the change attribute was saved.
 274  */
 275 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 276 {
 277         return !nfs_caches_unstable(inode)
 278                 && chattr == NFS_I(inode)->cache_change_attribute;
 279 }
 280
 281 /*
 282  * linux/fs/nfs/inode.c
 283  */
 284 extern void nfs_zap_caches(struct inode *);
 285 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 286                                 struct nfs_fattr *);
 287 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 288 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 289 extern int nfs_permission(struct inode *, int, struct nameidata *);
 290 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
 291 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 292 extern int nfs_open(struct inode *, struct file *);
 293 extern int nfs_release(struct inode *, struct file *);
 294 extern int nfs_attribute_timeout(struct inode *inode);
 295 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 296 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 297 extern int nfs_setattr(struct dentry *, struct iattr *);
 298 extern void nfs_begin_attr_update(struct inode *);
 299 extern void nfs_end_attr_update(struct inode *);
 300 extern void nfs_begin_data_update(struct inode *);
 301 extern void nfs_end_data_update(struct inode *);
 302 extern void nfs_end_data_update_defer(struct inode *);
 303 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
 304 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 305 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 306 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 307 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
 308 extern void nfs_file_clear_open_context(struct file *filp);
 309
 310 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 311 extern u32 root_nfs_parse_addr(char *name); /*__init*/
 312
 313 /*
 314  * linux/fs/nfs/file.c
 315  */
 316 extern struct inode_operations nfs_file_inode_operations;
 317 extern struct file_operations nfs_file_operations;
 318 extern struct address_space_operations nfs_file_aops;
 319
 320 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 321 {
 322         if (file != NULL) {
 323                 struct nfs_open_context *ctx;
 324
 325                 ctx = (struct nfs_open_context*)file->private_data;
 326                 return ctx->cred;
 327         }
 328         return NULL;
 329 }
 330
 331 /*
 332  * linux/fs/nfs/direct.c
 333  */
 334 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 335                         unsigned long);
 336 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
 337                         size_t count, loff_t pos);
 338 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
 339                         size_t count, loff_t pos);
 340
 341 /*
 342  * linux/fs/nfs/dir.c
 343  */
 344 extern struct inode_operations nfs_dir_inode_operations;
 345 extern struct file_operations nfs_dir_operations;
 346 extern struct dentry_operations nfs_dentry_operations;
 347
 348 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 349
 350 /*
 351  * linux/fs/nfs/symlink.c
 352  */
 353 extern struct inode_operations nfs_symlink_inode_operations;
 354
 355 /*
 356  * linux/fs/nfs/unlink.c
 357  */
 358 extern int  nfs_async_unlink(struct dentry *);
 359 extern void nfs_complete_unlink(struct dentry *);
 360
 361 /*
 362  * linux/fs/nfs/write.c
 363  */
 364 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 365 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 366 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 367 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 368 extern void nfs_writeback_done(struct rpc_task *task);
 369
 370 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 371 extern void nfs_commit_done(struct rpc_task *);
 372 #endif
 373
 374 /*
 375  * Try to write back everything synchronously (but check the
 376  * return value!)
 377  */
 378 extern int  nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
 379 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 380 extern int  nfs_commit_inode(struct inode *, unsigned long, unsigned int, int);
 381 #else
 382 static inline int
 383 nfs_commit_inode(struct inode *inode, unsigned long idx_start, unsigned int npages, int how)
 384 {
 385         return 0;
 386 }
 387 #endif
 388
 389 static inline int
 390 nfs_have_writebacks(struct inode *inode)
 391 {
 392         return NFS_I(inode)->npages != 0;
 393 }
 394
 395 static inline int
 396 nfs_wb_all(struct inode *inode)
 397 {
 398         int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
 399         return (error < 0) ? error : 0;
 400 }
 401
 402 /*
 403  * Write back all requests on one page - we do this before reading it.
 404  */
 405 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
 406 {
 407         int error = nfs_sync_inode(inode, page->index, 1,
 408                         how | FLUSH_WAIT | FLUSH_STABLE);
 409         return (error < 0) ? error : 0;
 410 }
 411
 412 static inline int nfs_wb_page(struct inode *inode, struct page* page)
 413 {
 414         return nfs_wb_page_priority(inode, page, 0);
 415 }
 416
 417 /*
 418  * Allocate and free nfs_write_data structures
 419  */
 420 extern mempool_t *nfs_wdata_mempool;
 421
 422 static inline struct nfs_write_data *nfs_writedata_alloc(void)
 423 {
 424         struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
 425         if (p) {
 426                 memset(p, 0, sizeof(*p));
 427                 INIT_LIST_HEAD(&p->pages);
 428         }
 429         return p;
 430 }
 431
 432 static inline void nfs_writedata_free(struct nfs_write_data *p)
 433 {
 434         mempool_free(p, nfs_wdata_mempool);
 435 }
 436
 437 /* Hack for future NFS swap support */
 438 #ifndef IS_SWAPFILE
 439 # define IS_SWAPFILE(inode)     (0)
 440 #endif
 441
 442 /*
 443  * linux/fs/nfs/read.c
 444  */
 445 extern int  nfs_readpage(struct file *, struct page *);
 446 extern int  nfs_readpages(struct file *, struct address_space *,
 447                 struct list_head *, unsigned);
 448 extern void nfs_readpage_result(struct rpc_task *);
 449
 450 /*
 451  * Allocate and free nfs_read_data structures
 452  */
 453 extern mempool_t *nfs_rdata_mempool;
 454
 455 static inline struct nfs_read_data *nfs_readdata_alloc(void)
 456 {
 457         struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
 458         if (p)
 459                 memset(p, 0, sizeof(*p));
 460         return p;
 461 }
 462
 463 static inline void nfs_readdata_free(struct nfs_read_data *p)
 464 {
 465         mempool_free(p, nfs_rdata_mempool);
 466 }
 467
 468 extern void  nfs_readdata_release(struct rpc_task *task);
 469
 470 /*
 471  * linux/fs/mount_clnt.c
 472  * (Used only by nfsroot module)
 473  */
 474 extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
 475                 int, int);
 476
 477 /*
 478  * inline functions
 479  */
 480
 481 static inline loff_t
 482 nfs_size_to_loff_t(__u64 size)
 483 {
 484         loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
 485         if (size > maxsz)
 486                 return maxsz;
 487         return (loff_t) size;
 488 }
 489
 490 static inline ino_t
 491 nfs_fileid_to_ino_t(u64 fileid)
 492 {
 493         ino_t ino = (ino_t) fileid;
 494         if (sizeof(ino_t) < sizeof(u64))
 495                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 496         return ino;
 497 }
 498
 499 /* NFS root */
 500
 501 extern void * nfs_root_data(void);
 502
 503 #define nfs_wait_event(clnt, wq, condition)                             \
 504 ({                                                                      \
 505         int __retval = 0;                                               \
 506         if (clnt->cl_intr) {                                            \
 507                 sigset_t oldmask;                                       \
 508                 rpc_clnt_sigmask(clnt, &oldmask);                       \
 509                 __retval = wait_event_interruptible(wq, condition);     \
 510                 rpc_clnt_sigunmask(clnt, &oldmask);                     \
 511         } else                                                          \
 512                 wait_event(wq, condition);                              \
 513         __retval;                                                       \
 514 })
 515
 516 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 517
 518 #ifdef CONFIG_NFS_V4
 519
 520 struct idmap;
 521
 522 /*
 523  * In a seqid-mutating op, this macro controls which error return
 524  * values trigger incrementation of the seqid.
 525  *
 526  * from rfc 3010:
 527  * The client MUST monotonically increment the sequence number for the
 528  * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
 529  * operations.  This is true even in the event that the previous
 530  * operation that used the sequence number received an error.  The only
 531  * exception to this rule is if the previous operation received one of
 532  * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
 533  * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
 534  * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
 535  *
 536  */
 537 #define seqid_mutating_err(err)       \
 538 (((err) != NFSERR_STALE_CLIENTID) &&  \
 539  ((err) != NFSERR_STALE_STATEID)  &&  \
 540  ((err) != NFSERR_BAD_STATEID)    &&  \
 541  ((err) != NFSERR_BAD_SEQID)      &&  \
 542  ((err) != NFSERR_BAD_XDR)        &&  \
 543  ((err) != NFSERR_RESOURCE)       &&  \
 544  ((err) != NFSERR_NOFILEHANDLE))
 545
 546 enum nfs4_client_state {
 547         NFS4CLNT_OK  = 0,
 548 };
 549
 550 /*
 551  * The nfs4_client identifies our client state to the server.
 552  */
 553 struct nfs4_client {
 554         struct list_head        cl_servers;     /* Global list of servers */
 555         struct in_addr          cl_addr;        /* Server identifier */
 556         u64                     cl_clientid;    /* constant */
 557         nfs4_verifier           cl_confirm;
 558         unsigned long           cl_state;
 559
 560         u32                     cl_lockowner_id;
 561
 562         /*
 563          * The following rwsem ensures exclusive access to the server
 564          * while we recover the state following a lease expiration.
 565          */
 566         struct rw_semaphore     cl_sem;
 567
 568         struct list_head        cl_delegations;
 569         struct list_head        cl_state_owners;
 570         struct list_head        cl_unused;
 571         int                     cl_nunused;
 572         spinlock_t              cl_lock;
 573         atomic_t                cl_count;
 574
 575         struct rpc_clnt *       cl_rpcclient;
 576         struct rpc_cred *       cl_cred;
 577
 578         struct list_head        cl_superblocks; /* List of nfs_server structs */
 579
 580         unsigned long           cl_lease_time;
 581         unsigned long           cl_last_renewal;
 582         struct work_struct      cl_renewd;
 583         struct work_struct      cl_recoverd;
 584
 585         wait_queue_head_t       cl_waitq;
 586         struct rpc_wait_queue   cl_rpcwaitq;
 587
 588         /* used for the setclientid verifier */
 589         struct timespec         cl_boot_time;
 590
 591         /* idmapper */
 592         struct idmap *          cl_idmap;
 593
 594         /* Our own IP address, as a null-terminated string.
 595          * This is used to generate the clientid, and the callback address.
 596          */
 597         char                    cl_ipaddr[16];
 598         unsigned char           cl_id_uniquifier;
 599 };
 600
 601 /*
 602  * NFS4 state_owners and lock_owners are simply labels for ordered
 603  * sequences of RPC calls. Their sole purpose is to provide once-only
 604  * semantics by allowing the server to identify replayed requests.
 605  *
 606  * The ->so_sema is held during all state_owner seqid-mutating operations:
 607  * OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
 608  * so_seqid.
 609  */
 610 struct nfs4_state_owner {
 611         struct list_head     so_list;    /* per-clientid list of state_owners */
 612         struct nfs4_client   *so_client;
 613         u32                  so_id;      /* 32-bit identifier, unique */
 614         struct semaphore     so_sema;
 615         u32                  so_seqid;   /* protected by so_sema */
 616         atomic_t             so_count;
 617
 618         struct rpc_cred      *so_cred;   /* Associated cred */
 619         struct list_head     so_states;
 620         struct list_head     so_delegations;
 621 };
 622
 623 /*
 624  * struct nfs4_state maintains the client-side state for a given
 625  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 626  *
 627  * OPEN:
 628  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 629  * we need to know how many files are open for reading or writing on a
 630  * given inode. This information too is stored here.
 631  *
 632  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 633  */
 634
 635 struct nfs4_lock_state {
 636         struct list_head        ls_locks;       /* Other lock stateids */
 637         fl_owner_t              ls_owner;       /* POSIX lock owner */
 638 #define NFS_LOCK_INITIALIZED 1
 639         int                     ls_flags;
 640         u32                     ls_seqid;
 641         u32                     ls_id;
 642         nfs4_stateid            ls_stateid;
 643         atomic_t                ls_count;
 644 };
 645
 646 /* bits for nfs4_state->flags */
 647 enum {
 648         LK_STATE_IN_USE,
 649         NFS_DELEGATED_STATE,
 650 };
 651
 652 struct nfs4_state {
 653         struct list_head open_states;   /* List of states for the same state_owner */
 654         struct list_head inode_states;  /* List of states for the same inode */
 655         struct list_head lock_states;   /* List of subservient lock stateids */
 656
 657         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 658         struct inode *inode;            /* Pointer to the inode */
 659
 660         unsigned long flags;            /* Do we hold any locks? */
 661         struct semaphore lock_sema;     /* Serializes file locking operations */
 662         rwlock_t state_lock;            /* Protects the lock_states list */
 663
 664         nfs4_stateid stateid;
 665
 666         unsigned int nreaders;
 667         unsigned int nwriters;
 668         int state;                      /* State on the server (R,W, or RW) */
 669         atomic_t count;
 670 };
 671
 672
 673 struct nfs4_exception {
 674         long timeout;
 675         int retry;
 676 };
 677
 678 struct nfs4_state_recovery_ops {
 679         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 680         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 681 };
 682
 683 extern struct dentry_operations nfs4_dentry_operations;
 684 extern struct inode_operations nfs4_dir_inode_operations;
 685
 686 /* nfs4proc.c */
 687 extern int nfs4_map_errors(int err);
 688 extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
 689 extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
 690 extern int nfs4_proc_async_renew(struct nfs4_client *);
 691 extern int nfs4_proc_renew(struct nfs4_client *);
 692 extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode);
 693 extern struct inode *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
 694 extern int nfs4_open_revalidate(struct inode *, struct dentry *, int);
 695
 696 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
 697 extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
 698
 699 /* nfs4renewd.c */
 700 extern void nfs4_schedule_state_renewal(struct nfs4_client *);
 701 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 702 extern void nfs4_kill_renewd(struct nfs4_client *);
 703
 704 /* nfs4state.c */
 705 extern void init_nfsv4_state(struct nfs_server *);
 706 extern void destroy_nfsv4_state(struct nfs_server *);
 707 extern struct nfs4_client *nfs4_get_client(struct in_addr *);
 708 extern void nfs4_put_client(struct nfs4_client *clp);
 709 extern int nfs4_init_client(struct nfs4_client *clp);
 710 extern struct nfs4_client *nfs4_find_client(struct in_addr *);
 711 extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);
 712
 713 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 714 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 715 extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
 716 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 717 extern void nfs4_put_open_state(struct nfs4_state *);
 718 extern void nfs4_close_state(struct nfs4_state *, mode_t);
 719 extern struct nfs4_state *nfs4_find_state(struct inode *, struct rpc_cred *, mode_t mode);
 720 extern void nfs4_increment_seqid(int status, struct nfs4_state_owner *sp);
 721 extern void nfs4_schedule_state_recovery(struct nfs4_client *);
 722 extern struct nfs4_lock_state *nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t);
 723 extern struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t);
 724 extern void nfs4_put_lock_state(struct nfs4_lock_state *state);
 725 extern void nfs4_increment_lock_seqid(int status, struct nfs4_lock_state *ls);
 726 extern void nfs4_notify_setlk(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
 727 extern void nfs4_notify_unlck(struct nfs4_state *, struct file_lock *, struct nfs4_lock_state *);
 728 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
 729
 730
 731
 732 struct nfs4_mount_data;
 733 #else
 734 #define init_nfsv4_state(server)  do { } while (0)
 735 #define destroy_nfsv4_state(server)       do { } while (0)
 736 #define nfs4_put_state_owner(inode, owner) do { } while (0)
 737 #define nfs4_put_open_state(state) do { } while (0)
 738 #define nfs4_close_state(a, b) do { } while (0)
 739 #define nfs4_renewd_prepare_shutdown(server) do { } while (0)
 740 #endif
 741
 742 #endif /* __KERNEL__ */
 743
 744 /*
 745  * NFS debug flags
 746  */
 747 #define NFSDBG_VFS              0x0001
 748 #define NFSDBG_DIRCACHE         0x0002
 749 #define NFSDBG_LOOKUPCACHE      0x0004
 750 #define NFSDBG_PAGECACHE        0x0008
 751 #define NFSDBG_PROC             0x0010
 752 #define NFSDBG_XDR              0x0020
 753 #define NFSDBG_FILE             0x0040
 754 #define NFSDBG_ROOT             0x0080
 755 #define NFSDBG_CALLBACK         0x0100
 756 #define NFSDBG_ALL              0xFFFF
 757
 758 #ifdef __KERNEL__
 759 # undef ifdebug
 760 # ifdef NFS_DEBUG
 761 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 762 # else
 763 #  define ifdebug(fac)          if (0)
 764 # endif
 765 #endif /* __KERNEL */
 766
 767 #endif