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