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 /*
  15  * Enable debugging support for nfs client.
  16  * Requires RPC_DEBUG.
  17  */
  18 #ifdef RPC_DEBUG
  19 # define NFS_DEBUG
  20 #endif
  21
  22 /* Default timeout values */
  23 #define NFS_MAX_UDP_TIMEOUT     (60*HZ)
  24 #define NFS_MAX_TCP_TIMEOUT     (600*HZ)
  25
  26 /*
  27  * When flushing a cluster of dirty pages, there can be different
  28  * strategies:
  29  */
  30 #define FLUSH_SYNC              1       /* file being synced, or contention */
  31 #define FLUSH_STABLE            4       /* commit to stable storage */
  32 #define FLUSH_LOWPRI            8       /* low priority background flush */
  33 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  34 #define FLUSH_NOCOMMIT          32      /* Don't send the NFSv3/v4 COMMIT */
  35 #define FLUSH_INVALIDATE        64      /* Invalidate the page cache */
  36
  37 #ifdef __KERNEL__
  38
  39 #include <linux/in.h>
  40 #include <linux/mm.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/rbtree.h>
  43 #include <linux/rwsem.h>
  44 #include <linux/wait.h>
  45
  46 #include <linux/sunrpc/debug.h>
  47 #include <linux/sunrpc/auth.h>
  48 #include <linux/sunrpc/clnt.h>
  49
  50 #include <linux/nfs.h>
  51 #include <linux/nfs2.h>
  52 #include <linux/nfs3.h>
  53 #include <linux/nfs4.h>
  54 #include <linux/nfs_xdr.h>
  55
  56 #include <linux/nfs_fs_sb.h>
  57
  58 #include <linux/rwsem.h>
  59 #include <linux/mempool.h>
  60
  61 /*
  62  * These are the default flags for swap requests
  63  */
  64 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  65
  66 /*
  67  * NFSv3/v4 Access mode cache entry
  68  */
  69 struct nfs_access_entry {
  70         struct rb_node          rb_node;
  71         struct list_head        lru;
  72         unsigned long           jiffies;
  73         struct rpc_cred *       cred;
  74         int                     mask;
  75 };
  76
  77 struct nfs4_state;
  78 struct nfs_open_context {
  79         atomic_t count;
  80         struct vfsmount *vfsmnt;
  81         struct dentry *dentry;
  82         struct rpc_cred *cred;
  83         struct nfs4_state *state;
  84         fl_owner_t lockowner;
  85         int mode;
  86         int error;
  87
  88         struct list_head list;
  89
  90         __u64 dir_cookie;
  91 };
  92
  93 /*
  94  * NFSv4 delegation
  95  */
  96 struct nfs_delegation;
  97
  98 struct posix_acl;
  99
 100 /*
 101  * nfs fs inode data in memory
 102  */
 103 struct nfs_inode {
 104         /*
 105          * The 64bit 'inode number'
 106          */
 107         __u64 fileid;
 108
 109         /*
 110          * NFS file handle
 111          */
 112         struct nfs_fh           fh;
 113
 114         /*
 115          * Various flags
 116          */
 117         unsigned long           flags;                  /* atomic bit ops */
 118         unsigned long           cache_validity;         /* bit mask */
 119
 120         /*
 121          * read_cache_jiffies is when we started read-caching this inode.
 122          * attrtimeo is for how long the cached information is assumed
 123          * to be valid. A successful attribute revalidation doubles
 124          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 125          * acregmin/acdirmin.
 126          *
 127          * We need to revalidate the cached attrs for this inode if
 128          *
 129          *      jiffies - read_cache_jiffies > attrtimeo
 130          */
 131         unsigned long           read_cache_jiffies;
 132         unsigned long           attrtimeo;
 133         unsigned long           attrtimeo_timestamp;
 134         __u64                   change_attr;            /* v4 only */
 135
 136         unsigned long           last_updated;
 137         /* "Generation counter" for the attribute cache. This is
 138          * bumped whenever we update the metadata on the
 139          * server.
 140          */
 141         unsigned long           cache_change_attribute;
 142         /*
 143          * Counter indicating the number of outstanding requests that
 144          * will cause a file data update.
 145          */
 146         atomic_t                data_updates;
 147
 148         struct rb_root          access_cache;
 149         struct list_head        access_cache_entry_lru;
 150         struct list_head        access_cache_inode_lru;
 151 #ifdef CONFIG_NFS_V3_ACL
 152         struct posix_acl        *acl_access;
 153         struct posix_acl        *acl_default;
 154 #endif
 155
 156         /*
 157          * This is the cookie verifier used for NFSv3 readdir
 158          * operations
 159          */
 160         __u32                   cookieverf[2];
 161
 162         /*
 163          * This is the list of dirty unwritten pages.
 164          */
 165         spinlock_t              req_lock;
 166         struct list_head        dirty;
 167         struct list_head        commit;
 168         struct radix_tree_root  nfs_page_tree;
 169
 170         unsigned int            ndirty,
 171                                 ncommit,
 172                                 npages;
 173
 174         /* Open contexts for shared mmap writes */
 175         struct list_head        open_files;
 176
 177 #ifdef CONFIG_NFS_V4
 178         struct nfs4_cached_acl  *nfs4_acl;
 179         /* NFSv4 state */
 180         struct list_head        open_states;
 181         struct nfs_delegation   *delegation;
 182         int                      delegation_state;
 183         struct rw_semaphore     rwsem;
 184 #endif /* CONFIG_NFS_V4*/
 185         struct inode            vfs_inode;
 186 };
 187
 188 /*
 189  * Cache validity bit flags
 190  */
 191 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 192 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 193 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 194 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 195 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 196 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 197
 198 /*
 199  * Bit offsets in flags field
 200  */
 201 #define NFS_INO_REVALIDATING    (0)             /* revalidating attrs */
 202 #define NFS_INO_ADVISE_RDPLUS   (1)             /* advise readdirplus */
 203 #define NFS_INO_STALE           (2)             /* possible stale inode */
 204 #define NFS_INO_ACL_LRU_SET     (3)             /* Inode is on the LRU list */
 205
 206 static inline struct nfs_inode *NFS_I(struct inode *inode)
 207 {
 208         return container_of(inode, struct nfs_inode, vfs_inode);
 209 }
 210 #define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))
 211
 212 #define NFS_FH(inode)                   (&NFS_I(inode)->fh)
 213 #define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
 214 #define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
 215 #define NFS_PROTO(inode)                (NFS_SERVER(inode)->nfs_client->rpc_ops)
 216 #define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
 217 #define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
 218 #define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
 219 #define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
 220 #define NFS_MINATTRTIMEO(inode) \
 221         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 222                                : NFS_SERVER(inode)->acregmin)
 223 #define NFS_MAXATTRTIMEO(inode) \
 224         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 225                                : NFS_SERVER(inode)->acregmax)
 226 #define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)
 227
 228 #define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
 229 #define NFS_STALE(inode)                (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
 230
 231 #define NFS_FILEID(inode)               (NFS_I(inode)->fileid)
 232
 233 static inline int nfs_caches_unstable(struct inode *inode)
 234 {
 235         return atomic_read(&NFS_I(inode)->data_updates) != 0;
 236 }
 237
 238 static inline void nfs_mark_for_revalidate(struct inode *inode)
 239 {
 240         struct nfs_inode *nfsi = NFS_I(inode);
 241
 242         spin_lock(&inode->i_lock);
 243         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 244         if (S_ISDIR(inode->i_mode))
 245                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 246         spin_unlock(&inode->i_lock);
 247 }
 248
 249 static inline void NFS_CACHEINV(struct inode *inode)
 250 {
 251         if (!nfs_caches_unstable(inode))
 252                 nfs_mark_for_revalidate(inode);
 253 }
 254
 255 static inline int nfs_server_capable(struct inode *inode, int cap)
 256 {
 257         return NFS_SERVER(inode)->caps & cap;
 258 }
 259
 260 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 261 {
 262         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
 263 }
 264
 265 /**
 266  * nfs_save_change_attribute - Returns the inode attribute change cookie
 267  * @inode - pointer to inode
 268  * The "change attribute" is updated every time we finish an operation
 269  * that will result in a metadata change on the server.
 270  */
 271 static inline long nfs_save_change_attribute(struct inode *inode)
 272 {
 273         return NFS_I(inode)->cache_change_attribute;
 274 }
 275
 276 /**
 277  * nfs_verify_change_attribute - Detects NFS inode cache updates
 278  * @inode - pointer to inode
 279  * @chattr - previously saved change attribute
 280  * Return "false" if metadata has been updated (or is in the process of
 281  * being updated) since the change attribute was saved.
 282  */
 283 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 284 {
 285         return !nfs_caches_unstable(inode)
 286                 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
 287 }
 288
 289 /*
 290  * linux/fs/nfs/inode.c
 291  */
 292 extern int nfs_sync_mapping(struct address_space *mapping);
 293 extern void nfs_zap_caches(struct inode *);
 294 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 295                                 struct nfs_fattr *);
 296 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 297 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 298 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 299 extern int nfs_permission(struct inode *, int, struct nameidata *);
 300 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
 301 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 302 extern void nfs_access_zap_cache(struct inode *inode);
 303 extern int nfs_open(struct inode *, struct file *);
 304 extern int nfs_release(struct inode *, struct file *);
 305 extern int nfs_attribute_timeout(struct inode *inode);
 306 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 307 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 308 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 309 extern int nfs_setattr(struct dentry *, struct iattr *);
 310 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 311 extern void nfs_begin_attr_update(struct inode *);
 312 extern void nfs_end_attr_update(struct inode *);
 313 extern void nfs_begin_data_update(struct inode *);
 314 extern void nfs_end_data_update(struct inode *);
 315 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 316 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 317 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
 318 extern struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
 319                                         const struct dentry *dentry,
 320                                         struct nfs_fh *fh,
 321                                         struct nfs_fattr *fattr);
 322
 323 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 324 extern u32 root_nfs_parse_addr(char *name); /*__init*/
 325
 326 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
 327 {
 328         fattr->valid = 0;
 329         fattr->time_start = jiffies;
 330 }
 331
 332 /*
 333  * linux/fs/nfs/file.c
 334  */
 335 extern struct inode_operations nfs_file_inode_operations;
 336 #ifdef CONFIG_NFS_V3
 337 extern struct inode_operations nfs3_file_inode_operations;
 338 #endif /* CONFIG_NFS_V3 */
 339 extern const struct file_operations nfs_file_operations;
 340 extern const struct address_space_operations nfs_file_aops;
 341
 342 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 343 {
 344         if (file != NULL) {
 345                 struct nfs_open_context *ctx;
 346
 347                 ctx = (struct nfs_open_context*)file->private_data;
 348                 return ctx->cred;
 349         }
 350         return NULL;
 351 }
 352
 353 /*
 354  * linux/fs/nfs/xattr.c
 355  */
 356 #ifdef CONFIG_NFS_V3_ACL
 357 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 358 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 359 extern int nfs3_setxattr(struct dentry *, const char *,
 360                         const void *, size_t, int);
 361 extern int nfs3_removexattr (struct dentry *, const char *name);
 362 #else
 363 # define nfs3_listxattr NULL
 364 # define nfs3_getxattr NULL
 365 # define nfs3_setxattr NULL
 366 # define nfs3_removexattr NULL
 367 #endif
 368
 369 /*
 370  * linux/fs/nfs/direct.c
 371  */
 372 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 373                         unsigned long);
 374 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
 375                         size_t count, loff_t pos);
 376 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
 377                         size_t count, loff_t pos);
 378
 379 /*
 380  * linux/fs/nfs/dir.c
 381  */
 382 extern struct inode_operations nfs_dir_inode_operations;
 383 #ifdef CONFIG_NFS_V3
 384 extern struct inode_operations nfs3_dir_inode_operations;
 385 #endif /* CONFIG_NFS_V3 */
 386 extern const struct file_operations nfs_dir_operations;
 387 extern struct dentry_operations nfs_dentry_operations;
 388
 389 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 390
 391 /*
 392  * linux/fs/nfs/symlink.c
 393  */
 394 extern struct inode_operations nfs_symlink_inode_operations;
 395
 396 /*
 397  * linux/fs/nfs/sysctl.c
 398  */
 399 #ifdef CONFIG_SYSCTL
 400 extern int nfs_register_sysctl(void);
 401 extern void nfs_unregister_sysctl(void);
 402 #else
 403 #define nfs_register_sysctl() 0
 404 #define nfs_unregister_sysctl() do { } while(0)
 405 #endif
 406
 407 /*
 408  * linux/fs/nfs/namespace.c
 409  */
 410 extern struct list_head nfs_automount_list;
 411 extern struct inode_operations nfs_mountpoint_inode_operations;
 412 extern struct inode_operations nfs_referral_inode_operations;
 413 extern int nfs_mountpoint_expiry_timeout;
 414 extern void nfs_release_automount_timer(void);
 415
 416 /*
 417  * linux/fs/nfs/unlink.c
 418  */
 419 extern int  nfs_async_unlink(struct dentry *);
 420 extern void nfs_complete_unlink(struct dentry *);
 421
 422 /*
 423  * linux/fs/nfs/write.c
 424  */
 425 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 426 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 427 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 428 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 429 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 430 extern void nfs_writedata_release(void *);
 431
 432 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 433 struct nfs_write_data *nfs_commit_alloc(void);
 434 void nfs_commit_free(struct nfs_write_data *p);
 435 #endif
 436
 437 /*
 438  * Try to write back everything synchronously (but check the
 439  * return value!)
 440  */
 441 extern int  nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
 442 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 443 extern int  nfs_commit_inode(struct inode *, int);
 444 extern void nfs_commit_release(void *wdata);
 445 #else
 446 static inline int
 447 nfs_commit_inode(struct inode *inode, int how)
 448 {
 449         return 0;
 450 }
 451 #endif
 452
 453 static inline int
 454 nfs_have_writebacks(struct inode *inode)
 455 {
 456         return NFS_I(inode)->npages != 0;
 457 }
 458
 459 static inline int
 460 nfs_wb_all(struct inode *inode)
 461 {
 462         int error = nfs_sync_inode_wait(inode, 0, 0, 0);
 463         return (error < 0) ? error : 0;
 464 }
 465
 466 /*
 467  * Write back all requests on one page - we do this before reading it.
 468  */
 469 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
 470 {
 471         int error = nfs_sync_inode_wait(inode, page->index, 1,
 472                         how | FLUSH_STABLE);
 473         return (error < 0) ? error : 0;
 474 }
 475
 476 static inline int nfs_wb_page(struct inode *inode, struct page* page)
 477 {
 478         return nfs_wb_page_priority(inode, page, 0);
 479 }
 480
 481 /*
 482  * Allocate nfs_write_data structures
 483  */
 484 extern struct nfs_write_data *nfs_writedata_alloc(size_t len);
 485
 486 /*
 487  * linux/fs/nfs/read.c
 488  */
 489 extern int  nfs_readpage(struct file *, struct page *);
 490 extern int  nfs_readpages(struct file *, struct address_space *,
 491                 struct list_head *, unsigned);
 492 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 493 extern void nfs_readdata_release(void *data);
 494
 495 /*
 496  * Allocate nfs_read_data structures
 497  */
 498 extern struct nfs_read_data *nfs_readdata_alloc(size_t len);
 499
 500 /*
 501  * linux/fs/nfs3proc.c
 502  */
 503 #ifdef CONFIG_NFS_V3_ACL
 504 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 505 extern int nfs3_proc_setacl(struct inode *inode, int type,
 506                             struct posix_acl *acl);
 507 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 508                 mode_t mode);
 509 extern void nfs3_forget_cached_acls(struct inode *inode);
 510 #else
 511 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 512                                             struct inode *inode,
 513                                             mode_t mode)
 514 {
 515         return 0;
 516 }
 517
 518 static inline void nfs3_forget_cached_acls(struct inode *inode)
 519 {
 520 }
 521 #endif /* CONFIG_NFS_V3_ACL */
 522
 523 /*
 524  * linux/fs/mount_clnt.c
 525  * (Used only by nfsroot module)
 526  */
 527 extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
 528                 int, int);
 529
 530 /*
 531  * inline functions
 532  */
 533
 534 static inline loff_t
 535 nfs_size_to_loff_t(__u64 size)
 536 {
 537         loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
 538         if (size > maxsz)
 539                 return maxsz;
 540         return (loff_t) size;
 541 }
 542
 543 static inline ino_t
 544 nfs_fileid_to_ino_t(u64 fileid)
 545 {
 546         ino_t ino = (ino_t) fileid;
 547         if (sizeof(ino_t) < sizeof(u64))
 548                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 549         return ino;
 550 }
 551
 552 /* NFS root */
 553
 554 extern void * nfs_root_data(void);
 555
 556 #define nfs_wait_event(clnt, wq, condition)                             \
 557 ({                                                                      \
 558         int __retval = 0;                                               \
 559         if (clnt->cl_intr) {                                            \
 560                 sigset_t oldmask;                                       \
 561                 rpc_clnt_sigmask(clnt, &oldmask);                       \
 562                 __retval = wait_event_interruptible(wq, condition);     \
 563                 rpc_clnt_sigunmask(clnt, &oldmask);                     \
 564         } else                                                          \
 565                 wait_event(wq, condition);                              \
 566         __retval;                                                       \
 567 })
 568
 569 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 570
 571 #endif /* __KERNEL__ */
 572
 573 /*
 574  * NFS debug flags
 575  */
 576 #define NFSDBG_VFS              0x0001
 577 #define NFSDBG_DIRCACHE         0x0002
 578 #define NFSDBG_LOOKUPCACHE      0x0004
 579 #define NFSDBG_PAGECACHE        0x0008
 580 #define NFSDBG_PROC             0x0010
 581 #define NFSDBG_XDR              0x0020
 582 #define NFSDBG_FILE             0x0040
 583 #define NFSDBG_ROOT             0x0080
 584 #define NFSDBG_CALLBACK         0x0100
 585 #define NFSDBG_CLIENT           0x0200
 586 #define NFSDBG_ALL              0xFFFF
 587
 588 #ifdef __KERNEL__
 589 # undef ifdebug
 590 # ifdef NFS_DEBUG
 591 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 592 # else
 593 #  define ifdebug(fac)          if (0)
 594 # endif
 595 #endif /* __KERNEL */
 596
 597 #endif