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 <<<<<<< HEAD:include/linux/nfs_fs.h
 199 =======
 200 #define NFS_INO_MOUNTPOINT      (4)             /* inode is remote mountpoint */
 201 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:include/linux/nfs_fs.h
 202
 203 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 204 {
 205         return container_of(inode, struct nfs_inode, vfs_inode);
 206 }
 207
 208 static inline struct nfs_server *NFS_SB(const struct super_block *s)
 209 {
 210         return (struct nfs_server *)(s->s_fs_info);
 211 }
 212
 213 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 214 {
 215         return &NFS_I(inode)->fh;
 216 }
 217
 218 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 219 {
 220         return NFS_SB(inode->i_sb);
 221 }
 222
 223 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 224 {
 225         return NFS_SERVER(inode)->client;
 226 }
 227
 228 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 229 {
 230         return NFS_SERVER(inode)->nfs_client->rpc_ops;
 231 }
 232
 233 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
 234 {
 235         return NFS_I(inode)->cookieverf;
 236 }
 237
 238 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 239 {
 240         struct nfs_server *nfss = NFS_SERVER(inode);
 241         return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 242 }
 243
 244 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 245 {
 246         struct nfs_server *nfss = NFS_SERVER(inode);
 247         return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 248 }
 249
 250 static inline int NFS_STALE(const struct inode *inode)
 251 {
 252         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 253 }
 254
 255 static inline __u64 NFS_FILEID(const struct inode *inode)
 256 {
 257         return NFS_I(inode)->fileid;
 258 }
 259
 260 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 261 {
 262         NFS_I(inode)->fileid = fileid;
 263 }
 264
 265 static inline void nfs_mark_for_revalidate(struct inode *inode)
 266 {
 267         struct nfs_inode *nfsi = NFS_I(inode);
 268
 269         spin_lock(&inode->i_lock);
 270         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 271         if (S_ISDIR(inode->i_mode))
 272                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 273         spin_unlock(&inode->i_lock);
 274 }
 275
 276 static inline int nfs_server_capable(struct inode *inode, int cap)
 277 {
 278         return NFS_SERVER(inode)->caps & cap;
 279 }
 280
 281 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 282 {
 283         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
 284 }
 285
 286 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 287 {
 288         dentry->d_time = verf;
 289 }
 290
 291 /**
 292  * nfs_save_change_attribute - Returns the inode attribute change cookie
 293  * @dir - pointer to parent directory inode
 294  * The "change attribute" is updated every time we finish an operation
 295  * that will result in a metadata change on the server.
 296  */
 297 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 298 {
 299         return NFS_I(dir)->cache_change_attribute;
 300 }
 301
 302 /**
 303  * nfs_verify_change_attribute - Detects NFS remote directory changes
 304  * @dir - pointer to parent directory inode
 305  * @chattr - previously saved change attribute
 306  * Return "false" if the verifiers doesn't match the change attribute.
 307  * This would usually indicate that the directory contents have changed on
 308  * the server, and that any dentries need revalidating.
 309  */
 310 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 311 {
 312         return chattr == NFS_I(dir)->cache_change_attribute;
 313 }
 314
 315 /*
 316  * linux/fs/nfs/inode.c
 317  */
 318 extern int nfs_sync_mapping(struct address_space *mapping);
 319 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 320 extern void nfs_zap_caches(struct inode *);
 321 extern void nfs_invalidate_atime(struct inode *);
 322 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 323                                 struct nfs_fattr *);
 324 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 325 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 326 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 327 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 328 extern int nfs_permission(struct inode *, int, struct nameidata *);
 329 extern int nfs_open(struct inode *, struct file *);
 330 extern int nfs_release(struct inode *, struct file *);
 331 extern int nfs_attribute_timeout(struct inode *inode);
 332 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 333 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 334 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 335 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
 336 extern int nfs_setattr(struct dentry *, struct iattr *);
 337 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 338 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 339 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 340 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
 341 extern u64 nfs_compat_user_ino64(u64 fileid);
 342
 343 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 344 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 345
 346 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
 347 {
 348         fattr->valid = 0;
 349         fattr->time_start = jiffies;
 350 }
 351
 352 /*
 353  * linux/fs/nfs/file.c
 354  */
 355 extern const struct inode_operations nfs_file_inode_operations;
 356 #ifdef CONFIG_NFS_V3
 357 extern const struct inode_operations nfs3_file_inode_operations;
 358 #endif /* CONFIG_NFS_V3 */
 359 extern const struct file_operations nfs_file_operations;
 360 extern const struct address_space_operations nfs_file_aops;
 361
 362 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 363 {
 364         return filp->private_data;
 365 }
 366
 367 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 368 {
 369         if (file != NULL)
 370                 return nfs_file_open_context(file)->cred;
 371         return NULL;
 372 }
 373
 374 /*
 375  * linux/fs/nfs/xattr.c
 376  */
 377 #ifdef CONFIG_NFS_V3_ACL
 378 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 379 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 380 extern int nfs3_setxattr(struct dentry *, const char *,
 381                         const void *, size_t, int);
 382 extern int nfs3_removexattr (struct dentry *, const char *name);
 383 #else
 384 # define nfs3_listxattr NULL
 385 # define nfs3_getxattr NULL
 386 # define nfs3_setxattr NULL
 387 # define nfs3_removexattr NULL
 388 #endif
 389
 390 /*
 391  * linux/fs/nfs/direct.c
 392  */
 393 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 394                         unsigned long);
 395 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 396                         const struct iovec *iov, unsigned long nr_segs,
 397                         loff_t pos);
 398 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 399                         const struct iovec *iov, unsigned long nr_segs,
 400                         loff_t pos);
 401
 402 /*
 403  * linux/fs/nfs/dir.c
 404  */
 405 extern const struct inode_operations nfs_dir_inode_operations;
 406 #ifdef CONFIG_NFS_V3
 407 extern const struct inode_operations nfs3_dir_inode_operations;
 408 #endif /* CONFIG_NFS_V3 */
 409 extern const struct file_operations nfs_dir_operations;
 410 extern struct dentry_operations nfs_dentry_operations;
 411
 412 extern void nfs_force_lookup_revalidate(struct inode *dir);
 413 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 414 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 415 extern void nfs_access_zap_cache(struct inode *inode);
 416
 417 /*
 418  * linux/fs/nfs/symlink.c
 419  */
 420 extern const struct inode_operations nfs_symlink_inode_operations;
 421
 422 /*
 423  * linux/fs/nfs/sysctl.c
 424  */
 425 #ifdef CONFIG_SYSCTL
 426 extern int nfs_register_sysctl(void);
 427 extern void nfs_unregister_sysctl(void);
 428 #else
 429 #define nfs_register_sysctl() 0
 430 #define nfs_unregister_sysctl() do { } while(0)
 431 #endif
 432
 433 /*
 434  * linux/fs/nfs/namespace.c
 435  */
 436 extern struct list_head nfs_automount_list;
 437 extern const struct inode_operations nfs_mountpoint_inode_operations;
 438 extern const struct inode_operations nfs_referral_inode_operations;
 439 extern int nfs_mountpoint_expiry_timeout;
 440 extern void nfs_release_automount_timer(void);
 441
 442 /*
 443  * linux/fs/nfs/unlink.c
 444  */
 445 extern int  nfs_async_unlink(struct inode *dir, struct dentry *dentry);
 446 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 447 extern void nfs_block_sillyrename(struct dentry *dentry);
 448 extern void nfs_unblock_sillyrename(struct dentry *dentry);
 449
 450 /*
 451  * linux/fs/nfs/write.c
 452  */
 453 extern int  nfs_congestion_kb;
 454 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 455 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 456 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 457 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 458 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 459 extern void nfs_writedata_release(void *);
 460
 461 /*
 462  * Try to write back everything synchronously (but check the
 463  * return value!)
 464  */
 465 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
 466 extern int nfs_wb_all(struct inode *inode);
 467 extern int nfs_wb_nocommit(struct inode *inode);
 468 extern int nfs_wb_page(struct inode *inode, struct page* page);
 469 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 470 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 471 extern int  nfs_commit_inode(struct inode *, int);
 472 extern struct nfs_write_data *nfs_commit_alloc(void);
 473 extern void nfs_commit_free(struct nfs_write_data *wdata);
 474 extern void nfs_commit_release(void *wdata);
 475 #else
 476 static inline int
 477 nfs_commit_inode(struct inode *inode, int how)
 478 {
 479         return 0;
 480 }
 481 #endif
 482
 483 static inline int
 484 nfs_have_writebacks(struct inode *inode)
 485 {
 486         return NFS_I(inode)->npages != 0;
 487 }
 488
 489 /*
 490  * Allocate nfs_write_data structures
 491  */
 492 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 493
 494 /*
 495  * linux/fs/nfs/read.c
 496  */
 497 extern int  nfs_readpage(struct file *, struct page *);
 498 extern int  nfs_readpages(struct file *, struct address_space *,
 499                 struct list_head *, unsigned);
 500 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 501 extern void nfs_readdata_release(void *data);
 502
 503 /*
 504  * Allocate nfs_read_data structures
 505  */
 506 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 507
 508 /*
 509  * linux/fs/nfs3proc.c
 510  */
 511 #ifdef CONFIG_NFS_V3_ACL
 512 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 513 extern int nfs3_proc_setacl(struct inode *inode, int type,
 514                             struct posix_acl *acl);
 515 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 516                 mode_t mode);
 517 extern void nfs3_forget_cached_acls(struct inode *inode);
 518 #else
 519 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 520                                             struct inode *inode,
 521                                             mode_t mode)
 522 {
 523         return 0;
 524 }
 525
 526 static inline void nfs3_forget_cached_acls(struct inode *inode)
 527 {
 528 }
 529 #endif /* CONFIG_NFS_V3_ACL */
 530
 531 /*
 532  * linux/fs/mount_clnt.c
 533  */
 534 extern int  nfs_mount(struct sockaddr *, size_t, char *, char *,
 535                       int, int, struct nfs_fh *);
 536
 537 /*
 538  * inline functions
 539  */
 540
 541 static inline loff_t nfs_size_to_loff_t(__u64 size)
 542 {
 543         if (size > (__u64) OFFSET_MAX - 1)
 544                 return OFFSET_MAX - 1;
 545         return (loff_t) size;
 546 }
 547
 548 static inline ino_t
 549 nfs_fileid_to_ino_t(u64 fileid)
 550 {
 551         ino_t ino = (ino_t) fileid;
 552         if (sizeof(ino_t) < sizeof(u64))
 553                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 554         return ino;
 555 }
 556
 557 /* NFS root */
 558
 559 extern void * nfs_root_data(void);
 560
 561 #define nfs_wait_event(clnt, wq, condition)                             \
 562 ({                                                                      \
 563         int __retval = wait_event_killable(wq, condition);              \
 564         __retval;                                                       \
 565 })
 566
 567 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 568
 569 #endif /* __KERNEL__ */
 570
 571 /*
 572  * NFS debug flags
 573  */
 574 #define NFSDBG_VFS              0x0001
 575 #define NFSDBG_DIRCACHE         0x0002
 576 #define NFSDBG_LOOKUPCACHE      0x0004
 577 #define NFSDBG_PAGECACHE        0x0008
 578 #define NFSDBG_PROC             0x0010
 579 #define NFSDBG_XDR              0x0020
 580 #define NFSDBG_FILE             0x0040
 581 #define NFSDBG_ROOT             0x0080
 582 #define NFSDBG_CALLBACK         0x0100
 583 #define NFSDBG_CLIENT           0x0200
 584 #define NFSDBG_MOUNT            0x0400
 585 #define NFSDBG_ALL              0xFFFF
 586
 587 #ifdef __KERNEL__
 588
 589 /*
 590  * Enable debugging support for nfs client.
 591  * Requires RPC_DEBUG.
 592  */
 593 #ifdef RPC_DEBUG
 594 # define NFS_DEBUG
 595 #endif
 596
 597 # undef ifdebug
 598 # ifdef NFS_DEBUG
 599 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 600 # else
 601 #  define ifdebug(fac)          if (0)
 602 # endif
 603 #endif /* __KERNEL */
 604
 605 #endif