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 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 #include <linux/nfs_fs_sb.h> 56 57 #include <linux/mempool.h> 58 59 /* 60 * These are the default flags for swap requests 61 */ 62 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) 63 64 /* 65 * NFSv3/v4 Access mode cache entry 66 */ 67 struct nfs_access_entry { 68 struct rb_node rb_node; 69 struct list_head lru; 70 unsigned long jiffies; 71 struct rpc_cred * cred; 72 int mask; 73 }; 74 75 struct nfs_lock_context { 76 atomic_t count; 77 struct list_head list; 78 struct nfs_open_context *open_context; 79 fl_owner_t lockowner; 80 pid_t pid; 81 }; 82 83 struct nfs4_state; 84 struct nfs_open_context { 85 struct nfs_lock_context lock_context; 86 struct path path; 87 struct rpc_cred *cred; 88 struct nfs4_state *state; 89 fmode_t mode; 90 91 unsigned long flags; 92 #define NFS_CONTEXT_ERROR_WRITE (0) 93 int error; 94 95 struct list_head list; 96 97 __u64 dir_cookie; 98 }; 99 100 /* 101 * NFSv4 delegation 102 */ 103 struct nfs_delegation; 104 105 struct posix_acl; 106 107 /* 108 * nfs fs inode data in memory 109 */ 110 struct nfs_inode { 111 /* 112 * The 64bit 'inode number' 113 */ 114 __u64 fileid; 115 116 /* 117 * NFS file handle 118 */ 119 struct nfs_fh fh; 120 121 /* 122 * Various flags 123 */ 124 unsigned long flags; /* atomic bit ops */ 125 unsigned long cache_validity; /* bit mask */ 126 127 /* 128 * read_cache_jiffies is when we started read-caching this inode. 129 * attrtimeo is for how long the cached information is assumed 130 * to be valid. A successful attribute revalidation doubles 131 * attrtimeo (up to acregmax/acdirmax), a failure resets it to 132 * acregmin/acdirmin. 133 * 134 * We need to revalidate the cached attrs for this inode if 135 * 136 * jiffies - read_cache_jiffies >= attrtimeo 137 * 138 * Please note the comparison is greater than or equal 139 * so that zero timeout values can be specified. 140 */ 141 unsigned long read_cache_jiffies; 142 unsigned long attrtimeo; 143 unsigned long attrtimeo_timestamp; 144 __u64 change_attr; /* v4 only */ 145 146 unsigned long attr_gencount; 147 /* "Generation counter" for the attribute cache. This is 148 * bumped whenever we update the metadata on the 149 * server. 150 */ 151 unsigned long cache_change_attribute; 152 153 struct rb_root access_cache; 154 struct list_head access_cache_entry_lru; 155 struct list_head access_cache_inode_lru; 156 #ifdef CONFIG_NFS_V3_ACL 157 struct posix_acl *acl_access; 158 struct posix_acl *acl_default; 159 #endif 160 161 /* 162 * This is the cookie verifier used for NFSv3 readdir 163 * operations 164 */ 165 __be32 cookieverf[2]; 166 167 /* 168 * This is the list of dirty unwritten pages. 169 */ 170 struct radix_tree_root nfs_page_tree; 171 172 unsigned long npages; 173 unsigned long ncommit; 174 175 /* Open contexts for shared mmap writes */ 176 struct list_head open_files; 177 178 /* Number of in-flight sillydelete RPC calls */ 179 atomic_t silly_count; 180 /* List of deferred sillydelete requests */ 181 struct hlist_head silly_list; 182 wait_queue_head_t waitqueue; 183 184 #ifdef CONFIG_NFS_V4 185 struct nfs4_cached_acl *nfs4_acl; 186 /* NFSv4 state */ 187 struct list_head open_states; 188 struct nfs_delegation *delegation; 189 fmode_t delegation_state; 190 struct rw_semaphore rwsem; 191 #endif /* CONFIG_NFS_V4*/ 192 #ifdef CONFIG_NFS_FSCACHE 193 struct fscache_cookie *fscache; 194 #endif 195 struct inode vfs_inode; 196 }; 197 198 /* 199 * Cache validity bit flags 200 */ 201 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */ 202 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */ 203 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */ 204 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */ 205 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */ 206 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */ 207 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */ 208 209 /* 210 * Bit offsets in flags field 211 */ 212 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */ 213 #define NFS_INO_STALE (1) /* possible stale inode */ 214 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ 215 #define NFS_INO_MOUNTPOINT (3) /* inode is remote mountpoint */ 216 #define NFS_INO_FLUSHING (4) /* inode is flushing out data */ 217 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */ 218 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */ 219 #define NFS_INO_COMMIT (7) /* inode is committing unstable writes */ 220 221 static inline struct nfs_inode *NFS_I(const struct inode *inode) 222 { 223 return container_of(inode, struct nfs_inode, vfs_inode); 224 } 225 226 static inline struct nfs_server *NFS_SB(const struct super_block *s) 227 { 228 return (struct nfs_server *)(s->s_fs_info); 229 } 230 231 static inline struct nfs_fh *NFS_FH(const struct inode *inode) 232 { 233 return &NFS_I(inode)->fh; 234 } 235 236 static inline struct nfs_server *NFS_SERVER(const struct inode *inode) 237 { 238 return NFS_SB(inode->i_sb); 239 } 240 241 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) 242 { 243 return NFS_SERVER(inode)->client; 244 } 245 246 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) 247 { 248 return NFS_SERVER(inode)->nfs_client->rpc_ops; 249 } 250 251 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode) 252 { 253 return NFS_I(inode)->cookieverf; 254 } 255 256 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) 257 { 258 struct nfs_server *nfss = NFS_SERVER(inode); 259 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; 260 } 261 262 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) 263 { 264 struct nfs_server *nfss = NFS_SERVER(inode); 265 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; 266 } 267 268 static inline int NFS_STALE(const struct inode *inode) 269 { 270 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 271 } 272 273 static inline int NFS_FSCACHE(const struct inode *inode) 274 { 275 return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags); 276 } 277 278 static inline __u64 NFS_FILEID(const struct inode *inode) 279 { 280 return NFS_I(inode)->fileid; 281 } 282 283 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid) 284 { 285 NFS_I(inode)->fileid = fileid; 286 } 287 288 static inline void nfs_mark_for_revalidate(struct inode *inode) 289 { 290 struct nfs_inode *nfsi = NFS_I(inode); 291 292 spin_lock(&inode->i_lock); 293 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; 294 if (S_ISDIR(inode->i_mode)) 295 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA; 296 spin_unlock(&inode->i_lock); 297 } 298 299 static inline int nfs_server_capable(struct inode *inode, int cap) 300 { 301 return NFS_SERVER(inode)->caps & cap; 302 } 303 304 static inline int NFS_USE_READDIRPLUS(struct inode *inode) 305 { 306 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 307 } 308 309 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) 310 { 311 dentry->d_time = verf; 312 } 313 314 /** 315 * nfs_save_change_attribute - Returns the inode attribute change cookie 316 * @dir - pointer to parent directory inode 317 * The "change attribute" is updated every time we finish an operation 318 * that will result in a metadata change on the server. 319 */ 320 static inline unsigned long nfs_save_change_attribute(struct inode *dir) 321 { 322 return NFS_I(dir)->cache_change_attribute; 323 } 324 325 /** 326 * nfs_verify_change_attribute - Detects NFS remote directory changes 327 * @dir - pointer to parent directory inode 328 * @chattr - previously saved change attribute 329 * Return "false" if the verifiers doesn't match the change attribute. 330 * This would usually indicate that the directory contents have changed on 331 * the server, and that any dentries need revalidating. 332 */ 333 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr) 334 { 335 return chattr == NFS_I(dir)->cache_change_attribute; 336 } 337 338 /* 339 * linux/fs/nfs/inode.c 340 */ 341 extern int nfs_sync_mapping(struct address_space *mapping); 342 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); 343 extern void nfs_zap_caches(struct inode *); 344 extern void nfs_invalidate_atime(struct inode *); 345 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, 346 struct nfs_fattr *); 347 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); 348 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); 349 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); 350 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 351 extern int nfs_permission(struct inode *, int); 352 extern int nfs_open(struct inode *, struct file *); 353 extern int nfs_release(struct inode *, struct file *); 354 extern int nfs_attribute_timeout(struct inode *inode); 355 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode); 356 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); 357 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); 358 extern int nfs_setattr(struct dentry *, struct iattr *); 359 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr); 360 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); 361 extern void put_nfs_open_context(struct nfs_open_context *ctx); 362 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode); 363 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); 364 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); 365 extern u64 nfs_compat_user_ino64(u64 fileid); 366 extern void nfs_fattr_init(struct nfs_fattr *fattr); 367 368 extern struct nfs_fattr *nfs_alloc_fattr(void); 369 370 static inline void nfs_free_fattr(const struct nfs_fattr *fattr) 371 { 372 kfree(fattr); 373 } 374 375 extern struct nfs_fh *nfs_alloc_fhandle(void); 376 377 static inline void nfs_free_fhandle(const struct nfs_fh *fh) 378 { 379 kfree(fh); 380 } 381 382 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ 383 extern __be32 root_nfs_parse_addr(char *name); /*__init*/ 384 extern unsigned long nfs_inc_attr_generation_counter(void); 385 386 /* 387 * linux/fs/nfs/file.c 388 */ 389 extern const struct inode_operations nfs_file_inode_operations; 390 #ifdef CONFIG_NFS_V3 391 extern const struct inode_operations nfs3_file_inode_operations; 392 #endif /* CONFIG_NFS_V3 */ 393 extern const struct file_operations nfs_file_operations; 394 extern const struct address_space_operations nfs_file_aops; 395 396 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) 397 { 398 return filp->private_data; 399 } 400 401 static inline struct rpc_cred *nfs_file_cred(struct file *file) 402 { 403 if (file != NULL) { 404 struct nfs_open_context *ctx = 405 nfs_file_open_context(file); 406 if (ctx) 407 return ctx->cred; 408 } 409 return NULL; 410 } 411 412 /* 413 * linux/fs/nfs/xattr.c 414 */ 415 #ifdef CONFIG_NFS_V3_ACL 416 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t); 417 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t); 418 extern int nfs3_setxattr(struct dentry *, const char *, 419 const void *, size_t, int); 420 extern int nfs3_removexattr (struct dentry *, const char *name); 421 #else 422 # define nfs3_listxattr NULL 423 # define nfs3_getxattr NULL 424 # define nfs3_setxattr NULL 425 # define nfs3_removexattr NULL 426 #endif 427 428 /* 429 * linux/fs/nfs/direct.c 430 */ 431 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t, 432 unsigned long); 433 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, 434 const struct iovec *iov, unsigned long nr_segs, 435 loff_t pos); 436 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, 437 const struct iovec *iov, unsigned long nr_segs, 438 loff_t pos); 439 440 /* 441 * linux/fs/nfs/dir.c 442 */ 443 extern const struct inode_operations nfs_dir_inode_operations; 444 #ifdef CONFIG_NFS_V3 445 extern const struct inode_operations nfs3_dir_inode_operations; 446 #endif /* CONFIG_NFS_V3 */ 447 extern const struct file_operations nfs_dir_operations; 448 extern const struct dentry_operations nfs_dentry_operations; 449 450 extern void nfs_force_lookup_revalidate(struct inode *dir); 451 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr); 452 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags); 453 extern void nfs_access_zap_cache(struct inode *inode); 454 455 /* 456 * linux/fs/nfs/symlink.c 457 */ 458 extern const struct inode_operations nfs_symlink_inode_operations; 459 460 /* 461 * linux/fs/nfs/sysctl.c 462 */ 463 #ifdef CONFIG_SYSCTL 464 extern int nfs_register_sysctl(void); 465 extern void nfs_unregister_sysctl(void); 466 #else 467 #define nfs_register_sysctl() 0 468 #define nfs_unregister_sysctl() do { } while(0) 469 #endif 470 471 /* 472 * linux/fs/nfs/namespace.c 473 */ 474 extern const struct inode_operations nfs_mountpoint_inode_operations; 475 extern const struct inode_operations nfs_referral_inode_operations; 476 extern int nfs_mountpoint_expiry_timeout; 477 extern void nfs_release_automount_timer(void); 478 479 /* 480 * linux/fs/nfs/unlink.c 481 */ 482 extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry); 483 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); 484 extern void nfs_block_sillyrename(struct dentry *dentry); 485 extern void nfs_unblock_sillyrename(struct dentry *dentry); 486 487 /* 488 * linux/fs/nfs/write.c 489 */ 490 extern int nfs_congestion_kb; 491 extern int nfs_writepage(struct page *page, struct writeback_control *wbc); 492 extern int nfs_writepages(struct address_space *, struct writeback_control *); 493 extern int nfs_flush_incompatible(struct file *file, struct page *page); 494 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); 495 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *); 496 497 /* 498 * Try to write back everything synchronously (but check the 499 * return value!) 500 */ 501 extern int nfs_wb_all(struct inode *inode); 502 extern int nfs_wb_page(struct inode *inode, struct page* page); 503 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); 504 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 505 extern int nfs_commit_inode(struct inode *, int); 506 extern struct nfs_write_data *nfs_commitdata_alloc(void); 507 extern void nfs_commit_free(struct nfs_write_data *wdata); 508 #else 509 static inline int 510 nfs_commit_inode(struct inode *inode, int how) 511 { 512 return 0; 513 } 514 #endif 515 516 static inline int 517 nfs_have_writebacks(struct inode *inode) 518 { 519 return NFS_I(inode)->npages != 0; 520 } 521 522 /* 523 * Allocate nfs_write_data structures 524 */ 525 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages); 526 extern void nfs_writedata_free(struct nfs_write_data *); 527 528 /* 529 * linux/fs/nfs/read.c 530 */ 531 extern int nfs_readpage(struct file *, struct page *); 532 extern int nfs_readpages(struct file *, struct address_space *, 533 struct list_head *, unsigned); 534 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *); 535 extern int nfs_readpage_async(struct nfs_open_context *, struct inode *, 536 struct page *); 537 538 /* 539 * Allocate nfs_read_data structures 540 */ 541 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages); 542 extern void nfs_readdata_free(struct nfs_read_data *); 543 544 /* 545 * linux/fs/nfs3proc.c 546 */ 547 #ifdef CONFIG_NFS_V3_ACL 548 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type); 549 extern int nfs3_proc_setacl(struct inode *inode, int type, 550 struct posix_acl *acl); 551 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, 552 mode_t mode); 553 extern void nfs3_forget_cached_acls(struct inode *inode); 554 #else 555 static inline int nfs3_proc_set_default_acl(struct inode *dir, 556 struct inode *inode, 557 mode_t mode) 558 { 559 return 0; 560 } 561 562 static inline void nfs3_forget_cached_acls(struct inode *inode) 563 { 564 } 565 #endif /* CONFIG_NFS_V3_ACL */ 566 567 /* 568 * inline functions 569 */ 570 571 static inline loff_t nfs_size_to_loff_t(__u64 size) 572 { 573 if (size > (__u64) OFFSET_MAX - 1) 574 return OFFSET_MAX - 1; 575 return (loff_t) size; 576 } 577 578 static inline ino_t 579 nfs_fileid_to_ino_t(u64 fileid) 580 { 581 ino_t ino = (ino_t) fileid; 582 if (sizeof(ino_t) < sizeof(u64)) 583 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; 584 return ino; 585 } 586 587 /* NFS root */ 588 589 extern void * nfs_root_data(void); 590 591 #define nfs_wait_event(clnt, wq, condition) \ 592 ({ \ 593 int __retval = wait_event_killable(wq, condition); \ 594 __retval; \ 595 }) 596 597 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) 598 599 #endif /* __KERNEL__ */ 600 601 /* 602 * NFS debug flags 603 */ 604 #define NFSDBG_VFS 0x0001 605 #define NFSDBG_DIRCACHE 0x0002 606 #define NFSDBG_LOOKUPCACHE 0x0004 607 #define NFSDBG_PAGECACHE 0x0008 608 #define NFSDBG_PROC 0x0010 609 #define NFSDBG_XDR 0x0020 610 #define NFSDBG_FILE 0x0040 611 #define NFSDBG_ROOT 0x0080 612 #define NFSDBG_CALLBACK 0x0100 613 #define NFSDBG_CLIENT 0x0200 614 #define NFSDBG_MOUNT 0x0400 615 #define NFSDBG_FSCACHE 0x0800 616 #define NFSDBG_ALL 0xFFFF 617 618 #ifdef __KERNEL__ 619 620 /* 621 * Enable debugging support for nfs client. 622 * Requires RPC_DEBUG. 623 */ 624 #ifdef RPC_DEBUG 625 # define NFS_DEBUG 626 #endif 627 628 # undef ifdebug 629 # ifdef NFS_DEBUG 630 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) 631 # else 632 # define ifdebug(fac) if (0) 633 # endif 634 #endif /* __KERNEL */ 635 636 #endif 637