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_NOCOMMIT          32      /* Don't send the NFSv3/v4 COMMIT */
  37 #define FLUSH_INVALIDATE        64      /* Invalidate the page cache */
  38 #define FLUSH_NOWRITEPAGE       128     /* Don't call writepage() */
  39
  40 #ifdef __KERNEL__
  41
  42 #include <linux/in.h>
  43 #include <linux/kref.h>
  44 #include <linux/mm.h>
  45 #include <linux/pagemap.h>
  46 #include <linux/rbtree.h>
  47 #include <linux/rwsem.h>
  48 #include <linux/wait.h>
  49
  50 #include <linux/sunrpc/debug.h>
  51 #include <linux/sunrpc/auth.h>
  52 #include <linux/sunrpc/clnt.h>
  53
  54 #include <linux/nfs.h>
  55 #include <linux/nfs2.h>
  56 #include <linux/nfs3.h>
  57 #include <linux/nfs4.h>
  58 #include <linux/nfs_xdr.h>
  59 #include <linux/nfs_fs_sb.h>
  60
  61 #include <linux/mempool.h>
  62
  63 /*
  64  * These are the default flags for swap requests
  65  */
  66 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  67
  68 /*
  69  * NFSv3/v4 Access mode cache entry
  70  */
  71 struct nfs_access_entry {
  72         struct rb_node          rb_node;
  73         struct list_head        lru;
  74         unsigned long           jiffies;
  75         struct rpc_cred *       cred;
  76         int                     mask;
  77 };
  78
  79 struct nfs4_state;
  80 struct nfs_open_context {
  81         atomic_t count;
  82         struct path path;
  83         struct rpc_cred *cred;
  84         struct nfs4_state *state;
  85         fl_owner_t lockowner;
  86         fmode_t mode;
  87
  88         unsigned long flags;
  89 #define NFS_CONTEXT_ERROR_WRITE         (0)
  90         int error;
  91
  92         struct list_head list;
  93
  94         __u64 dir_cookie;
  95 };
  96
  97 /*
  98  * NFSv4 delegation
  99  */
 100 struct nfs_delegation;
 101
 102 struct posix_acl;
 103
 104 /*
 105  * nfs fs inode data in memory
 106  */
 107 struct nfs_inode {
 108         /*
 109          * The 64bit 'inode number'
 110          */
 111         __u64 fileid;
 112
 113         /*
 114          * NFS file handle
 115          */
 116         struct nfs_fh           fh;
 117
 118         /*
 119          * Various flags
 120          */
 121         unsigned long           flags;                  /* atomic bit ops */
 122         unsigned long           cache_validity;         /* bit mask */
 123
 124         /*
 125          * read_cache_jiffies is when we started read-caching this inode.
 126          * attrtimeo is for how long the cached information is assumed
 127          * to be valid. A successful attribute revalidation doubles
 128          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 129          * acregmin/acdirmin.
 130          *
 131          * We need to revalidate the cached attrs for this inode if
 132          *
 133          *      jiffies - read_cache_jiffies >= attrtimeo
 134          *
 135          * Please note the comparison is greater than or equal
 136          * so that zero timeout values can be specified.
 137          */
 138         unsigned long           read_cache_jiffies;
 139         unsigned long           attrtimeo;
 140         unsigned long           attrtimeo_timestamp;
 141         __u64                   change_attr;            /* v4 only */
 142
 143         unsigned long           attr_gencount;
 144         /* "Generation counter" for the attribute cache. This is
 145          * bumped whenever we update the metadata on the
 146          * server.
 147          */
 148         unsigned long           cache_change_attribute;
 149
 150         struct rb_root          access_cache;
 151         struct list_head        access_cache_entry_lru;
 152         struct list_head        access_cache_inode_lru;
 153 #ifdef CONFIG_NFS_V3_ACL
 154         struct posix_acl        *acl_access;
 155         struct posix_acl        *acl_default;
 156 #endif
 157
 158         /*
 159          * This is the cookie verifier used for NFSv3 readdir
 160          * operations
 161          */
 162         __be32                  cookieverf[2];
 163
 164         /*
 165          * This is the list of dirty unwritten pages.
 166          */
 167         struct radix_tree_root  nfs_page_tree;
 168
 169         unsigned long           ncommit,
 170                                 npages;
 171
 172         /* Open contexts for shared mmap writes */
 173         struct list_head        open_files;
 174
 175         /* Number of in-flight sillydelete RPC calls */
 176         atomic_t                silly_count;
 177         /* List of deferred sillydelete requests */
 178         struct hlist_head       silly_list;
 179         wait_queue_head_t       waitqueue;
 180
 181 #ifdef CONFIG_NFS_V4
 182         struct nfs4_cached_acl  *nfs4_acl;
 183         /* NFSv4 state */
 184         struct list_head        open_states;
 185         struct nfs_delegation   *delegation;
 186         fmode_t                  delegation_state;
 187         struct rw_semaphore     rwsem;
 188 #endif /* CONFIG_NFS_V4*/
 189         struct inode            vfs_inode;
 190 };
 191
 192 /*
 193  * Cache validity bit flags
 194  */
 195 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 196 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 197 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 198 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 199 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 200 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 201 #define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 202
 203 /*
 204  * Bit offsets in flags field
 205  */
 206 #define NFS_INO_ADVISE_RDPLUS   (0)             /* advise readdirplus */
 207 #define NFS_INO_STALE           (1)             /* possible stale inode */
 208 #define NFS_INO_ACL_LRU_SET     (2)             /* Inode is on the LRU list */
 209 #define NFS_INO_MOUNTPOINT      (3)             /* inode is remote mountpoint */
 210
 211 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 212 {
 213         return container_of(inode, struct nfs_inode, vfs_inode);
 214 }
 215
 216 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 217 {
 218         return (struct nfs_server *)(s->s_fs_info);
 219 }
 220
 221 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 222 {
 223         return &NFS_I(inode)->fh;
 224 }
 225
 226 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 227 {
 228         return NFS_SB(inode->i_sb);
 229 }
 230
 231 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 232 {
 233         return NFS_SERVER(inode)->client;
 234 }
 235
 236 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 237 {
 238         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 239 }
 240
 241 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
 242 {
 243         return NFS_I(inode)->cookieverf;
 244 }
 245
 246 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 247 {
 248         struct nfs_server *nfss = NFS_SERVER(inode);
 249         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 250 }
 251
 252 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 253 {
 254         struct nfs_server *nfss = NFS_SERVER(inode);
 255         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 256 }
 257
 258 static inline int NFS_STALE(const struct inode *inode)
 259 {
 260         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 261 }
 262
 263 static inline __u64 NFS_FILEID(const struct inode *inode)
 264 {
 265         return NFS_I(inode)->fileid;
 266 }
 267
 268 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 269 {
 270         NFS_I(inode)->fileid = fileid;
 271 }
 272
 273 static inline void nfs_mark_for_revalidate(struct inode *inode)
 274 {
 275         struct nfs_inode *nfsi = NFS_I(inode);
 276
 277         spin_lock(&inode->i_lock);
 278         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 279         if (S_ISDIR(inode->i_mode))
 280                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 281         spin_unlock(&inode->i_lock);
 282 }
 283
 284 static inline int nfs_server_capable(struct inode *inode, int cap)
 285 {
 286         return NFS_SERVER(inode)->caps & cap;
 287 }
 288
 289 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 290 {
 291         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
 292 }
 293
 294 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 295 {
 296         dentry->d_time = verf;
 297 }
 298
 299 /**
 300  * nfs_save_change_attribute - Returns the inode attribute change cookie
 301  * @dir - pointer to parent directory inode
 302  * The "change attribute" is updated every time we finish an operation
 303  * that will result in a metadata change on the server.
 304  */
 305 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 306 {
 307         return NFS_I(dir)->cache_change_attribute;
 308 }
 309
 310 /**
 311  * nfs_verify_change_attribute - Detects NFS remote directory changes
 312  * @dir - pointer to parent directory inode
 313  * @chattr - previously saved change attribute
 314  * Return "false" if the verifiers doesn't match the change attribute.
 315  * This would usually indicate that the directory contents have changed on
 316  * the server, and that any dentries need revalidating.
 317  */
 318 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 319 {
 320         return chattr == NFS_I(dir)->cache_change_attribute;
 321 }
 322
 323 /*
 324  * linux/fs/nfs/inode.c
 325  */
 326 extern int nfs_sync_mapping(struct address_space *mapping);
 327 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 328 extern void nfs_zap_caches(struct inode *);
 329 extern void nfs_invalidate_atime(struct inode *);
 330 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 331                                 struct nfs_fattr *);
 332 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 333 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 334 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 335 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 336 extern int nfs_permission(struct inode *, int);
 337 extern int nfs_open(struct inode *, struct file *);
 338 extern int nfs_release(struct inode *, struct file *);
 339 extern int nfs_attribute_timeout(struct inode *inode);
 340 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 341 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 342 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 343 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
 344 extern int nfs_setattr(struct dentry *, struct iattr *);
 345 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 346 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 347 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 348 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 349 extern u64 nfs_compat_user_ino64(u64 fileid);
 350 extern void nfs_fattr_init(struct nfs_fattr *fattr);
 351
 352 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 353 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 354 extern unsigned long nfs_inc_attr_generation_counter(void);
 355
 356 /*
 357  * linux/fs/nfs/file.c
 358  */
 359 extern const struct inode_operations nfs_file_inode_operations;
 360 #ifdef CONFIG_NFS_V3
 361 extern const struct inode_operations nfs3_file_inode_operations;
 362 #endif /* CONFIG_NFS_V3 */
 363 extern const struct file_operations nfs_file_operations;
 364 extern const struct address_space_operations nfs_file_aops;
 365
 366 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 367 {
 368         return filp->private_data;
 369 }
 370
 371 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 372 {
 373         if (file != NULL) {
 374                 struct nfs_open_context *ctx =
 375                         nfs_file_open_context(file);
 376                 if (ctx)
 377                         return ctx->cred;
 378         }
 379         return NULL;
 380 }
 381
 382 /*
 383  * linux/fs/nfs/xattr.c
 384  */
 385 #ifdef CONFIG_NFS_V3_ACL
 386 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 387 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 388 extern int nfs3_setxattr(struct dentry *, const char *,
 389                         const void *, size_t, int);
 390 extern int nfs3_removexattr (struct dentry *, const char *name);
 391 #else
 392 # define nfs3_listxattr NULL
 393 # define nfs3_getxattr NULL
 394 # define nfs3_setxattr NULL
 395 # define nfs3_removexattr NULL
 396 #endif
 397
 398 /*
 399  * linux/fs/nfs/direct.c
 400  */
 401 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 402                         unsigned long);
 403 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 404                         const struct iovec *iov, unsigned long nr_segs,
 405                         loff_t pos);
 406 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 407                         const struct iovec *iov, unsigned long nr_segs,
 408                         loff_t pos);
 409
 410 /*
 411  * linux/fs/nfs/dir.c
 412  */
 413 extern const struct inode_operations nfs_dir_inode_operations;
 414 #ifdef CONFIG_NFS_V3
 415 extern const struct inode_operations nfs3_dir_inode_operations;
 416 #endif /* CONFIG_NFS_V3 */
 417 extern const struct file_operations nfs_dir_operations;
 418 extern struct dentry_operations nfs_dentry_operations;
 419
 420 extern void nfs_force_lookup_revalidate(struct inode *dir);
 421 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 422 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 423 extern void nfs_access_zap_cache(struct inode *inode);
 424
 425 /*
 426  * linux/fs/nfs/symlink.c
 427  */
 428 extern const struct inode_operations nfs_symlink_inode_operations;
 429
 430 /*
 431  * linux/fs/nfs/sysctl.c
 432  */
 433 #ifdef CONFIG_SYSCTL
 434 extern int nfs_register_sysctl(void);
 435 extern void nfs_unregister_sysctl(void);
 436 #else
 437 #define nfs_register_sysctl() 0
 438 #define nfs_unregister_sysctl() do { } while(0)
 439 #endif
 440
 441 /*
 442  * linux/fs/nfs/namespace.c
 443  */
 444 extern const struct inode_operations nfs_mountpoint_inode_operations;
 445 extern const struct inode_operations nfs_referral_inode_operations;
 446 extern int nfs_mountpoint_expiry_timeout;
 447 extern void nfs_release_automount_timer(void);
 448
 449 /*
 450  * linux/fs/nfs/unlink.c
 451  */
 452 extern int  nfs_async_unlink(struct inode *dir, struct dentry *dentry);
 453 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 454 extern void nfs_block_sillyrename(struct dentry *dentry);
 455 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 456
 457 /*
 458  * linux/fs/nfs/write.c
 459  */
 460 extern int  nfs_congestion_kb;
 461 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 462 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 463 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 464 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 465 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 466 extern void nfs_writedata_release(void *);
 467
 468 /*
 469  * Try to write back everything synchronously (but check the
 470  * return value!)
 471  */
 472 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
 473 extern int nfs_wb_all(struct inode *inode);
 474 extern int nfs_wb_nocommit(struct inode *inode);
 475 extern int nfs_wb_page(struct inode *inode, struct page* page);
 476 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 477 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 478 extern int  nfs_commit_inode(struct inode *, int);
 479 extern struct nfs_write_data *nfs_commitdata_alloc(void);
 480 extern void nfs_commit_free(struct nfs_write_data *wdata);
 481 extern void nfs_commitdata_release(void *wdata);
 482 #else
 483 static inline int
 484 nfs_commit_inode(struct inode *inode, int how)
 485 {
 486         return 0;
 487 }
 488 #endif
 489
 490 static inline int
 491 nfs_have_writebacks(struct inode *inode)
 492 {
 493         return NFS_I(inode)->npages != 0;
 494 }
 495
 496 /*
 497  * Allocate nfs_write_data structures
 498  */
 499 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 500
 501 /*
 502  * linux/fs/nfs/read.c
 503  */
 504 extern int  nfs_readpage(struct file *, struct page *);
 505 extern int  nfs_readpages(struct file *, struct address_space *,
 506                 struct list_head *, unsigned);
 507 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 508 extern void nfs_readdata_release(void *data);
 509
 510 /*
 511  * Allocate nfs_read_data structures
 512  */
 513 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 514
 515 /*
 516  * linux/fs/nfs3proc.c
 517  */
 518 #ifdef CONFIG_NFS_V3_ACL
 519 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 520 extern int nfs3_proc_setacl(struct inode *inode, int type,
 521                             struct posix_acl *acl);
 522 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 523                 mode_t mode);
 524 extern void nfs3_forget_cached_acls(struct inode *inode);
 525 #else
 526 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 527                                             struct inode *inode,
 528                                             mode_t mode)
 529 {
 530         return 0;
 531 }
 532
 533 static inline void nfs3_forget_cached_acls(struct inode *inode)
 534 {
 535 }
 536 #endif /* CONFIG_NFS_V3_ACL */
 537
 538 /*
 539  * inline functions
 540  */
 541
 542 static inline loff_t nfs_size_to_loff_t(__u64 size)
 543 {
 544         if (size > (__u64) OFFSET_MAX - 1)
 545                 return OFFSET_MAX - 1;
 546         return (loff_t) size;
 547 }
 548
 549 static inline ino_t
 550 nfs_fileid_to_ino_t(u64 fileid)
 551 {
 552         ino_t ino = (ino_t) fileid;
 553         if (sizeof(ino_t) < sizeof(u64))
 554                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 555         return ino;
 556 }
 557
 558 /* NFS root */
 559
 560 extern void * nfs_root_data(void);
 561
 562 #define nfs_wait_event(clnt, wq, condition)                             \
 563 ({                                                                      \
 564         int __retval = wait_event_killable(wq, condition);              \
 565         __retval;                                                       \
 566 })
 567
 568 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 569
 570 #endif /* __KERNEL__ */
 571
 572 /*
 573  * NFS debug flags
 574  */
 575 #define NFSDBG_VFS              0x0001
 576 #define NFSDBG_DIRCACHE         0x0002
 577 #define NFSDBG_LOOKUPCACHE      0x0004
 578 #define NFSDBG_PAGECACHE        0x0008
 579 #define NFSDBG_PROC             0x0010
 580 #define NFSDBG_XDR              0x0020
 581 #define NFSDBG_FILE             0x0040
 582 #define NFSDBG_ROOT             0x0080
 583 #define NFSDBG_CALLBACK         0x0100
 584 #define NFSDBG_CLIENT           0x0200
 585 #define NFSDBG_MOUNT            0x0400
 586 #define NFSDBG_ALL              0xFFFF
 587
 588 #ifdef __KERNEL__
 589
 590 /*
 591  * Enable debugging support for nfs client.
 592  * Requires RPC_DEBUG.
 593  */
 594 #ifdef RPC_DEBUG
 595 # define NFS_DEBUG
 596 #endif
 597
 598 # undef ifdebug
 599 # ifdef NFS_DEBUG
 600 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 601 # else
 602 #  define ifdebug(fac)          if (0)
 603 # endif
 604 #endif /* __KERNEL */
 605
 606 #endif