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 #define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */ 37 #define FLUSH_INVALIDATE 64 /* Invalidate the page cache */ 38 #define FLUSH_NOWRITEPAGE 128 /* Don't call writepage() */ 39 40 #ifdef __KERNEL__ 41 42 #include <linux/in.h> 43 #include <linux/kref.h> 44 #include <linux/mm.h> 45 #include <linux/pagemap.h> 46 #include <linux/rbtree.h> 47 #include <linux/rwsem.h> 48 #include <linux/wait.h> 49 50 #include <linux/sunrpc/debug.h> 51 #include <linux/sunrpc/auth.h> 52 #include <linux/sunrpc/clnt.h> 53 54 #include <linux/nfs.h> 55 #include <linux/nfs2.h> 56 #include <linux/nfs3.h> 57 #include <linux/nfs4.h> 58 #include <linux/nfs_xdr.h> 59 #include <linux/nfs_fs_sb.h> 60 61 #include <linux/mempool.h> 62 63 /* 64 * These are the default flags for swap requests 65 */ 66 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) 67 68 /* 69 * NFSv3/v4 Access mode cache entry 70 */ 71 struct nfs_access_entry { 72 struct rb_node rb_node; 73 struct list_head lru; 74 unsigned long jiffies; 75 struct rpc_cred * cred; 76 int mask; 77 }; 78 79 struct nfs4_state; 80 struct nfs_open_context { 81 atomic_t count; 82 struct path path; 83 struct rpc_cred *cred; 84 struct nfs4_state *state; 85 fl_owner_t lockowner; 86 fmode_t mode; 87 88 unsigned long flags; 89 #define NFS_CONTEXT_ERROR_WRITE (0) 90 int error; 91 92 struct list_head list; 93 94 __u64 dir_cookie; 95 }; 96 97 /* 98 * NFSv4 delegation 99 */ 100 struct nfs_delegation; 101 102 struct posix_acl; 103 104 /* 105 * nfs fs inode data in memory 106 */ 107 struct nfs_inode { 108 /* 109 * The 64bit 'inode number' 110 */ 111 __u64 fileid; 112 113 /* 114 * NFS file handle 115 */ 116 struct nfs_fh fh; 117 118 /* 119 * Various flags 120 */ 121 unsigned long flags; /* atomic bit ops */ 122 unsigned long cache_validity; /* bit mask */ 123 124 /* 125 * read_cache_jiffies is when we started read-caching this inode. 126 * attrtimeo is for how long the cached information is assumed 127 * to be valid. A successful attribute revalidation doubles 128 * attrtimeo (up to acregmax/acdirmax), a failure resets it to 129 * acregmin/acdirmin. 130 * 131 * We need to revalidate the cached attrs for this inode if 132 * 133 * jiffies - read_cache_jiffies >= attrtimeo 134 * 135 * Please note the comparison is greater than or equal 136 * so that zero timeout values can be specified. 137 */ 138 unsigned long read_cache_jiffies; 139 unsigned long attrtimeo; 140 unsigned long attrtimeo_timestamp; 141 __u64 change_attr; /* v4 only */ 142 143 unsigned long attr_gencount; 144 /* "Generation counter" for the attribute cache. This is 145 * bumped whenever we update the metadata on the 146 * server. 147 */ 148 unsigned long cache_change_attribute; 149 150 struct rb_root access_cache; 151 struct list_head access_cache_entry_lru; 152 struct list_head access_cache_inode_lru; 153 #ifdef CONFIG_NFS_V3_ACL 154 struct posix_acl *acl_access; 155 struct posix_acl *acl_default; 156 #endif 157 158 /* 159 * This is the cookie verifier used for NFSv3 readdir 160 * operations 161 */ 162 __be32 cookieverf[2]; 163 164 /* 165 * This is the list of dirty unwritten pages. 166 */ 167 struct radix_tree_root nfs_page_tree; 168 169 unsigned long npages; 170 171 /* Open contexts for shared mmap writes */ 172 struct list_head open_files; 173 174 /* Number of in-flight sillydelete RPC calls */ 175 atomic_t silly_count; 176 /* List of deferred sillydelete requests */ 177 struct hlist_head silly_list; 178 wait_queue_head_t waitqueue; 179 180 #ifdef CONFIG_NFS_V4 181 struct nfs4_cached_acl *nfs4_acl; 182 /* NFSv4 state */ 183 struct list_head open_states; 184 struct nfs_delegation *delegation; 185 fmode_t delegation_state; 186 struct rw_semaphore rwsem; 187 #endif /* CONFIG_NFS_V4*/ 188 struct inode vfs_inode; 189 }; 190 191 /* 192 * Cache validity bit flags 193 */ 194 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */ 195 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */ 196 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */ 197 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */ 198 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */ 199 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */ 200 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */ 201 202 /* 203 * Bit offsets in flags field 204 */ 205 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */ 206 #define NFS_INO_STALE (1) /* possible stale inode */ 207 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ 208 #define NFS_INO_MOUNTPOINT (3) /* inode is remote mountpoint */ 209 #define NFS_INO_FLUSHING (4) /* inode is flushing out data */ 210 211 static inline struct nfs_inode *NFS_I(const struct inode *inode) 212 { 213 return container_of(inode, struct nfs_inode, vfs_inode); 214 } 215 216 static inline struct nfs_server *NFS_SB(const struct super_block *s) 217 { 218 return (struct nfs_server *)(s->s_fs_info); 219 } 220 221 static inline struct nfs_fh *NFS_FH(const struct inode *inode) 222 { 223 return &NFS_I(inode)->fh; 224 } 225 226 static inline struct nfs_server *NFS_SERVER(const struct inode *inode) 227 { 228 return NFS_SB(inode->i_sb); 229 } 230 231 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) 232 { 233 return NFS_SERVER(inode)->client; 234 } 235 236 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) 237 { 238 return NFS_SERVER(inode)->nfs_client->rpc_ops; 239 } 240 241 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode) 242 { 243 return NFS_I(inode)->cookieverf; 244 } 245 246 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) 247 { 248 struct nfs_server *nfss = NFS_SERVER(inode); 249 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; 250 } 251 252 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) 253 { 254 struct nfs_server *nfss = NFS_SERVER(inode); 255 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; 256 } 257 258 static inline int NFS_STALE(const struct inode *inode) 259 { 260 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 261 } 262 263 static inline __u64 NFS_FILEID(const struct inode *inode) 264 { 265 return NFS_I(inode)->fileid; 266 } 267 268 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid) 269 { 270 NFS_I(inode)->fileid = fileid; 271 } 272 273 static inline void nfs_mark_for_revalidate(struct inode *inode) 274 { 275 struct nfs_inode *nfsi = NFS_I(inode); 276 277 spin_lock(&inode->i_lock); 278 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; 279 if (S_ISDIR(inode->i_mode)) 280 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA; 281 spin_unlock(&inode->i_lock); 282 } 283 284 static inline int nfs_server_capable(struct inode *inode, int cap) 285 { 286 return NFS_SERVER(inode)->caps & cap; 287 } 288 289 static inline int NFS_USE_READDIRPLUS(struct inode *inode) 290 { 291 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 292 } 293 294 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) 295 { 296 dentry->d_time = verf; 297 } 298 299 /** 300 * nfs_save_change_attribute - Returns the inode attribute change cookie 301 * @dir - pointer to parent directory inode 302 * The "change attribute" is updated every time we finish an operation 303 * that will result in a metadata change on the server. 304 */ 305 static inline unsigned long nfs_save_change_attribute(struct inode *dir) 306 { 307 return NFS_I(dir)->cache_change_attribute; 308 } 309 310 /** 311 * nfs_verify_change_attribute - Detects NFS remote directory changes 312 * @dir - pointer to parent directory inode 313 * @chattr - previously saved change attribute 314 * Return "false" if the verifiers doesn't match the change attribute. 315 * This would usually indicate that the directory contents have changed on 316 * the server, and that any dentries need revalidating. 317 */ 318 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr) 319 { 320 return chattr == NFS_I(dir)->cache_change_attribute; 321 } 322 323 /* 324 * linux/fs/nfs/inode.c 325 */ 326 extern int nfs_sync_mapping(struct address_space *mapping); 327 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); 328 extern void nfs_zap_caches(struct inode *); 329 extern void nfs_invalidate_atime(struct inode *); 330 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, 331 struct nfs_fattr *); 332 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); 333 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); 334 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); 335 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 336 extern int nfs_permission(struct inode *, int); 337 extern int nfs_open(struct inode *, struct file *); 338 extern int nfs_release(struct inode *, struct file *); 339 extern int nfs_attribute_timeout(struct inode *inode); 340 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode); 341 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); 342 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); 343 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping); 344 extern int nfs_setattr(struct dentry *, struct iattr *); 345 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr); 346 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); 347 extern void put_nfs_open_context(struct nfs_open_context *ctx); 348 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode); 349 extern u64 nfs_compat_user_ino64(u64 fileid); 350 extern void nfs_fattr_init(struct nfs_fattr *fattr); 351 352 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ 353 extern __be32 root_nfs_parse_addr(char *name); /*__init*/ 354 extern unsigned long nfs_inc_attr_generation_counter(void); 355 356 /* 357 * linux/fs/nfs/file.c 358 */ 359 extern const struct inode_operations nfs_file_inode_operations; 360 #ifdef CONFIG_NFS_V3 361 extern const struct inode_operations nfs3_file_inode_operations; 362 #endif /* CONFIG_NFS_V3 */ 363 extern const struct file_operations nfs_file_operations; 364 extern const struct address_space_operations nfs_file_aops; 365 366 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) 367 { 368 return filp->private_data; 369 } 370 371 static inline struct rpc_cred *nfs_file_cred(struct file *file) 372 { 373 if (file != NULL) { 374 struct nfs_open_context *ctx = 375 nfs_file_open_context(file); 376 if (ctx) 377 return ctx->cred; 378 } 379 return NULL; 380 } 381 382 /* 383 * linux/fs/nfs/xattr.c 384 */ 385 #ifdef CONFIG_NFS_V3_ACL 386 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t); 387 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t); 388 extern int nfs3_setxattr(struct dentry *, const char *, 389 const void *, size_t, int); 390 extern int nfs3_removexattr (struct dentry *, const char *name); 391 #else 392 # define nfs3_listxattr NULL 393 # define nfs3_getxattr NULL 394 # define nfs3_setxattr NULL 395 # define nfs3_removexattr NULL 396 #endif 397 398 /* 399 * linux/fs/nfs/direct.c 400 */ 401 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t, 402 unsigned long); 403 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, 404 const struct iovec *iov, unsigned long nr_segs, 405 loff_t pos); 406 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, 407 const struct iovec *iov, unsigned long nr_segs, 408 loff_t pos); 409 410 /* 411 * linux/fs/nfs/dir.c 412 */ 413 extern const struct inode_operations nfs_dir_inode_operations; 414 #ifdef CONFIG_NFS_V3 415 extern const struct inode_operations nfs3_dir_inode_operations; 416 #endif /* CONFIG_NFS_V3 */ 417 extern const struct file_operations nfs_dir_operations; 418 extern const struct dentry_operations nfs_dentry_operations; 419 420 extern void nfs_force_lookup_revalidate(struct inode *dir); 421 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr); 422 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags); 423 extern void nfs_access_zap_cache(struct inode *inode); 424 425 /* 426 * linux/fs/nfs/symlink.c 427 */ 428 extern const struct inode_operations nfs_symlink_inode_operations; 429 430 /* 431 * linux/fs/nfs/sysctl.c 432 */ 433 #ifdef CONFIG_SYSCTL 434 extern int nfs_register_sysctl(void); 435 extern void nfs_unregister_sysctl(void); 436 #else 437 #define nfs_register_sysctl() 0 438 #define nfs_unregister_sysctl() do { } while(0) 439 #endif 440 441 /* 442 * linux/fs/nfs/namespace.c 443 */ 444 extern const struct inode_operations nfs_mountpoint_inode_operations; 445 extern const struct inode_operations nfs_referral_inode_operations; 446 extern int nfs_mountpoint_expiry_timeout; 447 extern void nfs_release_automount_timer(void); 448 449 /* 450 * linux/fs/nfs/unlink.c 451 */ 452 extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry); 453 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); 454 extern void nfs_block_sillyrename(struct dentry *dentry); 455 extern void nfs_unblock_sillyrename(struct dentry *dentry); 456 457 /* 458 * linux/fs/nfs/write.c 459 */ 460 extern int nfs_congestion_kb; 461 extern int nfs_writepage(struct page *page, struct writeback_control *wbc); 462 extern int nfs_writepages(struct address_space *, struct writeback_control *); 463 extern int nfs_flush_incompatible(struct file *file, struct page *page); 464 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); 465 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *); 466 extern void nfs_writedata_release(void *); 467 468 /* 469 * Try to write back everything synchronously (but check the 470 * return value!) 471 */ 472 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int); 473 extern int nfs_wb_all(struct inode *inode); 474 extern int nfs_wb_nocommit(struct inode *inode); 475 extern int nfs_wb_page(struct inode *inode, struct page* page); 476 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); 477 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 478 extern int nfs_commit_inode(struct inode *, int); 479 extern struct nfs_write_data *nfs_commitdata_alloc(void); 480 extern void nfs_commit_free(struct nfs_write_data *wdata); 481 extern void nfs_commitdata_release(void *wdata); 482 #else 483 static inline int 484 nfs_commit_inode(struct inode *inode, int how) 485 { 486 return 0; 487 } 488 #endif 489 490 static inline int 491 nfs_have_writebacks(struct inode *inode) 492 { 493 return NFS_I(inode)->npages != 0; 494 } 495 496 /* 497 * Allocate nfs_write_data structures 498 */ 499 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages); 500 501 /* 502 * linux/fs/nfs/read.c 503 */ 504 extern int nfs_readpage(struct file *, struct page *); 505 extern int nfs_readpages(struct file *, struct address_space *, 506 struct list_head *, unsigned); 507 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *); 508 extern void nfs_readdata_release(void *data); 509 510 /* 511 * Allocate nfs_read_data structures 512 */ 513 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages); 514 515 /* 516 * linux/fs/nfs3proc.c 517 */ 518 #ifdef CONFIG_NFS_V3_ACL 519 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type); 520 extern int nfs3_proc_setacl(struct inode *inode, int type, 521 struct posix_acl *acl); 522 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, 523 mode_t mode); 524 extern void nfs3_forget_cached_acls(struct inode *inode); 525 #else 526 static inline int nfs3_proc_set_default_acl(struct inode *dir, 527 struct inode *inode, 528 mode_t mode) 529 { 530 return 0; 531 } 532 533 static inline void nfs3_forget_cached_acls(struct inode *inode) 534 { 535 } 536 #endif /* CONFIG_NFS_V3_ACL */ 537 538 /* 539 * inline functions 540 */ 541 542 static inline loff_t nfs_size_to_loff_t(__u64 size) 543 { 544 if (size > (__u64) OFFSET_MAX - 1) 545 return OFFSET_MAX - 1; 546 return (loff_t) size; 547 } 548 549 static inline ino_t 550 nfs_fileid_to_ino_t(u64 fileid) 551 { 552 ino_t ino = (ino_t) fileid; 553 if (sizeof(ino_t) < sizeof(u64)) 554 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; 555 return ino; 556 } 557 558 /* NFS root */ 559 560 extern void * nfs_root_data(void); 561 562 #define nfs_wait_event(clnt, wq, condition) \ 563 ({ \ 564 int __retval = wait_event_killable(wq, condition); \ 565 __retval; \ 566 }) 567 568 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) 569 570 #endif /* __KERNEL__ */ 571 572 /* 573 * NFS debug flags 574 */ 575 #define NFSDBG_VFS 0x0001 576 #define NFSDBG_DIRCACHE 0x0002 577 #define NFSDBG_LOOKUPCACHE 0x0004 578 #define NFSDBG_PAGECACHE 0x0008 579 #define NFSDBG_PROC 0x0010 580 #define NFSDBG_XDR 0x0020 581 #define NFSDBG_FILE 0x0040 582 #define NFSDBG_ROOT 0x0080 583 #define NFSDBG_CALLBACK 0x0100 584 #define NFSDBG_CLIENT 0x0200 585 #define NFSDBG_MOUNT 0x0400 586 #define NFSDBG_ALL 0xFFFF 587 588 #ifdef __KERNEL__ 589 590 /* 591 * Enable debugging support for nfs client. 592 * Requires RPC_DEBUG. 593 */ 594 #ifdef RPC_DEBUG 595 # define NFS_DEBUG 596 #endif 597 598 # undef ifdebug 599 # ifdef NFS_DEBUG 600 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) 601 # else 602 # define ifdebug(fac) if (0) 603 # endif 604 #endif /* __KERNEL */ 605 606 #endif 607