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_MAX_UDP_TIMEOUT     (60*HZ)
  16 #define NFS_MAX_TCP_TIMEOUT     (600*HZ)
  17
  18 /*
  19  * When flushing a cluster of dirty pages, there can be different
  20  * strategies:
  21  */
  22 #define FLUSH_SYNC              1       /* file being synced, or contention */
  23 #define FLUSH_STABLE            4       /* commit to stable storage */
  24 #define FLUSH_LOWPRI            8       /* low priority background flush */
  25 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  26 #define FLUSH_NOCOMMIT          32      /* Don't send the NFSv3/v4 COMMIT */
  27 #define FLUSH_INVALIDATE        64      /* Invalidate the page cache */
  28 #define FLUSH_NOWRITEPAGE       128     /* Don't call writepage() */
  29
  30 #ifdef __KERNEL__
  31
  32 #include <linux/in.h>
  33 #include <linux/kref.h>
  34 #include <linux/mm.h>
  35 #include <linux/namei.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/rbtree.h>
  38 #include <linux/rwsem.h>
  39 #include <linux/wait.h>
  40
  41 #include <linux/sunrpc/debug.h>
  42 #include <linux/sunrpc/auth.h>
  43 #include <linux/sunrpc/clnt.h>
  44
  45 #include <linux/nfs.h>
  46 #include <linux/nfs2.h>
  47 #include <linux/nfs3.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_xdr.h>
  50 #include <linux/nfs_fs_sb.h>
  51
  52 #include <linux/mempool.h>
  53
  54 /*
  55  * These are the default flags for swap requests
  56  */
  57 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  58
  59 /*
  60  * NFSv3/v4 Access mode cache entry
  61  */
  62 struct nfs_access_entry {
  63         struct rb_node          rb_node;
  64         struct list_head        lru;
  65         unsigned long           jiffies;
  66         struct rpc_cred *       cred;
  67         int                     mask;
  68 };
  69
  70 struct nfs4_state;
  71 struct nfs_open_context {
  72         atomic_t count;
  73         struct path path;
  74         struct rpc_cred *cred;
  75         struct nfs4_state *state;
  76         fl_owner_t lockowner;
  77         int mode;
  78
  79         unsigned long flags;
  80 #define NFS_CONTEXT_ERROR_WRITE         (0)
  81         int error;
  82
  83         struct list_head list;
  84
  85         __u64 dir_cookie;
  86 };
  87
  88 /*
  89  * NFSv4 delegation
  90  */
  91 struct nfs_delegation;
  92
  93 struct posix_acl;
  94
  95 /*
  96  * nfs fs inode data in memory
  97  */
  98 struct nfs_inode {
  99         /*
 100          * The 64bit 'inode number'
 101          */
 102         __u64 fileid;
 103
 104         /*
 105          * NFS file handle
 106          */
 107         struct nfs_fh           fh;
 108
 109         /*
 110          * Various flags
 111          */
 112         unsigned long           flags;                  /* atomic bit ops */
 113         unsigned long           cache_validity;         /* bit mask */
 114
 115         /*
 116          * read_cache_jiffies is when we started read-caching this inode.
 117          * attrtimeo is for how long the cached information is assumed
 118          * to be valid. A successful attribute revalidation doubles
 119          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 120          * acregmin/acdirmin.
 121          *
 122          * We need to revalidate the cached attrs for this inode if
 123          *
 124          *      jiffies - read_cache_jiffies > attrtimeo
 125          */
 126         unsigned long           read_cache_jiffies;
 127         unsigned long           attrtimeo;
 128         unsigned long           attrtimeo_timestamp;
 129         __u64                   change_attr;            /* v4 only */
 130
 131         unsigned long           last_updated;
 132         /* "Generation counter" for the attribute cache. This is
 133          * bumped whenever we update the metadata on the
 134          * server.
 135          */
 136         unsigned long           cache_change_attribute;
 137
 138         struct rb_root          access_cache;
 139         struct list_head        access_cache_entry_lru;
 140         struct list_head        access_cache_inode_lru;
 141 #ifdef CONFIG_NFS_V3_ACL
 142         struct posix_acl        *acl_access;
 143         struct posix_acl        *acl_default;
 144 #endif
 145
 146         /*
 147          * This is the cookie verifier used for NFSv3 readdir
 148          * operations
 149          */
 150         __be32                  cookieverf[2];
 151
 152         /*
 153          * This is the list of dirty unwritten pages.
 154          */
 155         struct radix_tree_root  nfs_page_tree;
 156
 157         unsigned long           ncommit,
 158                                 npages;
 159
 160         /* Open contexts for shared mmap writes */
 161         struct list_head        open_files;
 162
 163         /* Number of in-flight sillydelete RPC calls */
 164         atomic_t                silly_count;
 165         /* List of deferred sillydelete requests */
 166         struct hlist_head       silly_list;
 167         wait_queue_head_t       waitqueue;
 168
 169 #ifdef CONFIG_NFS_V4
 170         struct nfs4_cached_acl  *nfs4_acl;
 171         /* NFSv4 state */
 172         struct list_head        open_states;
 173         struct nfs_delegation   *delegation;
 174         int                      delegation_state;
 175         struct rw_semaphore     rwsem;
 176 #endif /* CONFIG_NFS_V4*/
 177         struct inode            vfs_inode;
 178 };
 179
 180 /*
 181  * Cache validity bit flags
 182  */
 183 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 184 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 185 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 186 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 187 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 188 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 189 #define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 190
 191 /*
 192  * Bit offsets in flags field
 193  */
 194 #define NFS_INO_REVALIDATING    (0)             /* revalidating attrs */
 195 #define NFS_INO_ADVISE_RDPLUS   (1)             /* advise readdirplus */
 196 #define NFS_INO_STALE           (2)             /* possible stale inode */
 197 #define NFS_INO_ACL_LRU_SET     (3)             /* Inode is on the LRU list */
 198
 199 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 200 {
 201         return container_of(inode, struct nfs_inode, vfs_inode);
 202 }
 203
 204 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 205 {
 206         return (struct nfs_server *)(s->s_fs_info);
 207 }
 208
 209 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 210 {
 211         return &NFS_I(inode)->fh;
 212 }
 213
 214 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 215 {
 216         return NFS_SB(inode->i_sb);
 217 }
 218
 219 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 220 {
 221         return NFS_SERVER(inode)->client;
 222 }
 223
 224 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 225 {
 226         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 227 }
 228
 229 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
 230 {
 231         return NFS_I(inode)->cookieverf;
 232 }
 233
 234 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 235 {
 236         struct nfs_server *nfss = NFS_SERVER(inode);
 237         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 238 }
 239
 240 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 241 {
 242         struct nfs_server *nfss = NFS_SERVER(inode);
 243         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 244 }
 245
 246 static inline int NFS_STALE(const struct inode *inode)
 247 {
 248         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 249 }
 250
 251 static inline __u64 NFS_FILEID(const struct inode *inode)
 252 {
 253         return NFS_I(inode)->fileid;
 254 }
 255
 256 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 257 {
 258         NFS_I(inode)->fileid = fileid;
 259 }
 260
 261 static inline void nfs_mark_for_revalidate(struct inode *inode)
 262 {
 263         struct nfs_inode *nfsi = NFS_I(inode);
 264
 265         spin_lock(&inode->i_lock);
 266         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 267         if (S_ISDIR(inode->i_mode))
 268                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 269         spin_unlock(&inode->i_lock);
 270 }
 271
 272 static inline int nfs_server_capable(struct inode *inode, int cap)
 273 {
 274         return NFS_SERVER(inode)->caps & cap;
 275 }
 276
 277 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 278 {
 279         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
 280 }
 281
 282 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 283 {
 284         dentry->d_time = verf;
 285 }
 286
 287 /**
 288  * nfs_save_change_attribute - Returns the inode attribute change cookie
 289  * @dir - pointer to parent directory inode
 290  * The "change attribute" is updated every time we finish an operation
 291  * that will result in a metadata change on the server.
 292  */
 293 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 294 {
 295         return NFS_I(dir)->cache_change_attribute;
 296 }
 297
 298 /**
 299  * nfs_verify_change_attribute - Detects NFS remote directory changes
 300  * @dir - pointer to parent directory inode
 301  * @chattr - previously saved change attribute
 302  * Return "false" if the verifiers doesn't match the change attribute.
 303  * This would usually indicate that the directory contents have changed on
 304  * the server, and that any dentries need revalidating.
 305  */
 306 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 307 {
 308         return chattr == NFS_I(dir)->cache_change_attribute;
 309 }
 310
 311 /*
 312  * linux/fs/nfs/inode.c
 313  */
 314 extern int nfs_sync_mapping(struct address_space *mapping);
 315 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 316 extern void nfs_zap_caches(struct inode *);
 317 extern void nfs_invalidate_atime(struct inode *);
 318 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 319                                 struct nfs_fattr *);
 320 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 321 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 322 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 323 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 324 extern int nfs_permission(struct inode *, int, struct nameidata *);
 325 extern int nfs_open(struct inode *, struct file *);
 326 extern int nfs_release(struct inode *, struct file *);
 327 extern int nfs_attribute_timeout(struct inode *inode);
 328 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 329 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 330 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 331 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
 332 extern int nfs_setattr(struct dentry *, struct iattr *);
 333 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 334 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 335 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 336 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
 337 extern u64 nfs_compat_user_ino64(u64 fileid);
 338
 339 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 340 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 341
 342 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
 343 {
 344         fattr->valid = 0;
 345         fattr->time_start = jiffies;
 346 }
 347
 348 /*
 349  * linux/fs/nfs/file.c
 350  */
 351 extern const struct inode_operations nfs_file_inode_operations;
 352 #ifdef CONFIG_NFS_V3
 353 extern const struct inode_operations nfs3_file_inode_operations;
 354 #endif /* CONFIG_NFS_V3 */
 355 extern const struct file_operations nfs_file_operations;
 356 extern const struct address_space_operations nfs_file_aops;
 357
 358 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 359 {
 360         return filp->private_data;
 361 }
 362
 363 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 364 {
 365         if (file != NULL)
 366                 return nfs_file_open_context(file)->cred;
 367         return NULL;
 368 }
 369
 370 /*
 371  * linux/fs/nfs/xattr.c
 372  */
 373 #ifdef CONFIG_NFS_V3_ACL
 374 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 375 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 376 extern int nfs3_setxattr(struct dentry *, const char *,
 377                         const void *, size_t, int);
 378 extern int nfs3_removexattr (struct dentry *, const char *name);
 379 #else
 380 # define nfs3_listxattr NULL
 381 # define nfs3_getxattr NULL
 382 # define nfs3_setxattr NULL
 383 # define nfs3_removexattr NULL
 384 #endif
 385
 386 /*
 387  * linux/fs/nfs/direct.c
 388  */
 389 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 390                         unsigned long);
 391 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 392                         const struct iovec *iov, unsigned long nr_segs,
 393                         loff_t pos);
 394 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 395                         const struct iovec *iov, unsigned long nr_segs,
 396                         loff_t pos);
 397
 398 /*
 399  * linux/fs/nfs/dir.c
 400  */
 401 extern const struct inode_operations nfs_dir_inode_operations;
 402 #ifdef CONFIG_NFS_V3
 403 extern const struct inode_operations nfs3_dir_inode_operations;
 404 #endif /* CONFIG_NFS_V3 */
 405 extern const struct file_operations nfs_dir_operations;
 406 extern struct dentry_operations nfs_dentry_operations;
 407
 408 extern void nfs_force_lookup_revalidate(struct inode *dir);
 409 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 410 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 411 extern void nfs_access_zap_cache(struct inode *inode);
 412
 413 /*
 414  * linux/fs/nfs/symlink.c
 415  */
 416 extern const struct inode_operations nfs_symlink_inode_operations;
 417
 418 /*
 419  * linux/fs/nfs/sysctl.c
 420  */
 421 #ifdef CONFIG_SYSCTL
 422 extern int nfs_register_sysctl(void);
 423 extern void nfs_unregister_sysctl(void);
 424 #else
 425 #define nfs_register_sysctl() 0
 426 #define nfs_unregister_sysctl() do { } while(0)
 427 #endif
 428
 429 /*
 430  * linux/fs/nfs/namespace.c
 431  */
 432 extern struct list_head nfs_automount_list;
 433 extern const struct inode_operations nfs_mountpoint_inode_operations;
 434 extern const struct inode_operations nfs_referral_inode_operations;
 435 extern int nfs_mountpoint_expiry_timeout;
 436 extern void nfs_release_automount_timer(void);
 437
 438 /*
 439  * linux/fs/nfs/unlink.c
 440  */
 441 extern int  nfs_async_unlink(struct inode *dir, struct dentry *dentry);
 442 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 443 extern void nfs_block_sillyrename(struct dentry *dentry);
 444 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 445
 446 /*
 447  * linux/fs/nfs/write.c
 448  */
 449 extern int  nfs_congestion_kb;
 450 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 451 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 452 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 453 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 454 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 455 extern void nfs_writedata_release(void *);
 456
 457 /*
 458  * Try to write back everything synchronously (but check the
 459  * return value!)
 460  */
 461 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
 462 extern int nfs_wb_all(struct inode *inode);
 463 extern int nfs_wb_nocommit(struct inode *inode);
 464 extern int nfs_wb_page(struct inode *inode, struct page* page);
 465 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 466 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 467 extern int  nfs_commit_inode(struct inode *, int);
 468 extern struct nfs_write_data *nfs_commit_alloc(void);
 469 extern void nfs_commit_free(struct nfs_write_data *wdata);
 470 extern void nfs_commit_release(void *wdata);
 471 #else
 472 static inline int
 473 nfs_commit_inode(struct inode *inode, int how)
 474 {
 475         return 0;
 476 }
 477 #endif
 478
 479 static inline int
 480 nfs_have_writebacks(struct inode *inode)
 481 {
 482         return NFS_I(inode)->npages != 0;
 483 }
 484
 485 /*
 486  * Allocate nfs_write_data structures
 487  */
 488 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 489
 490 /*
 491  * linux/fs/nfs/read.c
 492  */
 493 extern int  nfs_readpage(struct file *, struct page *);
 494 extern int  nfs_readpages(struct file *, struct address_space *,
 495                 struct list_head *, unsigned);
 496 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 497 extern void nfs_readdata_release(void *data);
 498
 499 /*
 500  * Allocate nfs_read_data structures
 501  */
 502 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 503
 504 /*
 505  * linux/fs/nfs3proc.c
 506  */
 507 #ifdef CONFIG_NFS_V3_ACL
 508 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 509 extern int nfs3_proc_setacl(struct inode *inode, int type,
 510                             struct posix_acl *acl);
 511 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 512                 mode_t mode);
 513 extern void nfs3_forget_cached_acls(struct inode *inode);
 514 #else
 515 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 516                                             struct inode *inode,
 517                                             mode_t mode)
 518 {
 519         return 0;
 520 }
 521
 522 static inline void nfs3_forget_cached_acls(struct inode *inode)
 523 {
 524 }
 525 #endif /* CONFIG_NFS_V3_ACL */
 526
 527 /*
 528  * linux/fs/mount_clnt.c
 529  */
 530 extern int  nfs_mount(struct sockaddr *, size_t, char *, char *,
 531                       int, int, struct nfs_fh *);
 532
 533 /*
 534  * inline functions
 535  */
 536
 537 static inline loff_t nfs_size_to_loff_t(__u64 size)
 538 {
 539         if (size > (__u64) OFFSET_MAX - 1)
 540                 return OFFSET_MAX - 1;
 541         return (loff_t) size;
 542 }
 543
 544 static inline ino_t
 545 nfs_fileid_to_ino_t(u64 fileid)
 546 {
 547         ino_t ino = (ino_t) fileid;
 548         if (sizeof(ino_t) < sizeof(u64))
 549                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 550         return ino;
 551 }
 552
 553 /* NFS root */
 554
 555 extern void * nfs_root_data(void);
 556
 557 #define nfs_wait_event(clnt, wq, condition)                             \
 558 ({                                                                      \
 559         int __retval = wait_event_killable(wq, condition);              \
 560         __retval;                                                       \
 561 })
 562
 563 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 564
 565 #endif /* __KERNEL__ */
 566
 567 /*
 568  * NFS debug flags
 569  */
 570 #define NFSDBG_VFS              0x0001
 571 #define NFSDBG_DIRCACHE         0x0002
 572 #define NFSDBG_LOOKUPCACHE      0x0004
 573 #define NFSDBG_PAGECACHE        0x0008
 574 #define NFSDBG_PROC             0x0010
 575 #define NFSDBG_XDR              0x0020
 576 #define NFSDBG_FILE             0x0040
 577 #define NFSDBG_ROOT             0x0080
 578 #define NFSDBG_CALLBACK         0x0100
 579 #define NFSDBG_CLIENT           0x0200
 580 #define NFSDBG_MOUNT            0x0400
 581 #define NFSDBG_ALL              0xFFFF
 582
 583 #ifdef __KERNEL__
 584
 585 /*
 586  * Enable debugging support for nfs client.
 587  * Requires RPC_DEBUG.
 588  */
 589 #ifdef RPC_DEBUG
 590 # define NFS_DEBUG
 591 #endif
 592
 593 # undef ifdebug
 594 # ifdef NFS_DEBUG
 595 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 596 # else
 597 #  define ifdebug(fac)          if (0)
 598 # endif
 599 #endif /* __KERNEL */
 600
 601 #endif