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 #ifndef _LINUX_NFS_FS_H 9 #define _LINUX_NFS_FS_H 10 11 #include <uapi/linux/nfs_fs.h> 12 13 14 /* 15 * Enable dprintk() debugging support for nfs client. 16 */ 17 #ifdef CONFIG_NFS_DEBUG 18 # define NFS_DEBUG 19 #endif 20 21 #include <linux/in.h> 22 #include <linux/mm.h> 23 #include <linux/pagemap.h> 24 #include <linux/rbtree.h> 25 #include <linux/rwsem.h> 26 #include <linux/wait.h> 27 28 #include <linux/sunrpc/debug.h> 29 #include <linux/sunrpc/auth.h> 30 #include <linux/sunrpc/clnt.h> 31 32 #include <linux/nfs.h> 33 #include <linux/nfs2.h> 34 #include <linux/nfs3.h> 35 #include <linux/nfs4.h> 36 #include <linux/nfs_xdr.h> 37 #include <linux/nfs_fs_sb.h> 38 39 #include <linux/mempool.h> 40 41 /* 42 * These are the default flags for swap requests 43 */ 44 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) 45 46 /* 47 * NFSv3/v4 Access mode cache entry 48 */ 49 struct nfs_access_entry { 50 struct rb_node rb_node; 51 struct list_head lru; 52 unsigned long jiffies; 53 struct rpc_cred * cred; 54 int mask; 55 }; 56 57 struct nfs_lockowner { 58 fl_owner_t l_owner; 59 pid_t l_pid; 60 }; 61 62 #define NFS_IO_INPROGRESS 0 63 struct nfs_io_counter { 64 unsigned long flags; 65 atomic_t io_count; 66 }; 67 68 struct nfs_lock_context { 69 atomic_t count; 70 struct list_head list; 71 struct nfs_open_context *open_context; 72 struct nfs_lockowner lockowner; 73 struct nfs_io_counter io_count; 74 }; 75 76 struct nfs4_state; 77 struct nfs_open_context { 78 struct nfs_lock_context lock_context; 79 struct dentry *dentry; 80 struct rpc_cred *cred; 81 struct nfs4_state *state; 82 fmode_t mode; 83 84 unsigned long flags; 85 #define NFS_CONTEXT_ERROR_WRITE (0) 86 #define NFS_CONTEXT_RESEND_WRITES (1) 87 #define NFS_CONTEXT_BAD (2) 88 int error; 89 90 struct list_head list; 91 struct nfs4_threshold *mdsthreshold; 92 }; 93 94 struct nfs_open_dir_context { 95 struct rpc_cred *cred; 96 unsigned long attr_gencount; 97 __u64 dir_cookie; 98 __u64 dup_cookie; 99 signed char duped; 100 }; 101 102 /* 103 * NFSv4 delegation 104 */ 105 struct nfs_delegation; 106 107 struct posix_acl; 108 109 /* 110 * nfs fs inode data in memory 111 */ 112 struct nfs_inode { 113 /* 114 * The 64bit 'inode number' 115 */ 116 __u64 fileid; 117 118 /* 119 * NFS file handle 120 */ 121 struct nfs_fh fh; 122 123 /* 124 * Various flags 125 */ 126 unsigned long flags; /* atomic bit ops */ 127 unsigned long cache_validity; /* bit mask */ 128 129 /* 130 * read_cache_jiffies is when we started read-caching this inode. 131 * attrtimeo is for how long the cached information is assumed 132 * to be valid. A successful attribute revalidation doubles 133 * attrtimeo (up to acregmax/acdirmax), a failure resets it to 134 * acregmin/acdirmin. 135 * 136 * We need to revalidate the cached attrs for this inode if 137 * 138 * jiffies - read_cache_jiffies >= attrtimeo 139 * 140 * Please note the comparison is greater than or equal 141 * so that zero timeout values can be specified. 142 */ 143 unsigned long read_cache_jiffies; 144 unsigned long attrtimeo; 145 unsigned long attrtimeo_timestamp; 146 147 unsigned long attr_gencount; 148 /* "Generation counter" for the attribute cache. This is 149 * bumped whenever we update the metadata on the 150 * server. 151 */ 152 unsigned long cache_change_attribute; 153 154 struct rb_root access_cache; 155 struct list_head access_cache_entry_lru; 156 struct list_head access_cache_inode_lru; 157 158 /* 159 * This is the cookie verifier used for NFSv3 readdir 160 * operations 161 */ 162 __be32 cookieverf[2]; 163 164 unsigned long npages; 165 struct nfs_mds_commit_info commit_info; 166 167 /* Open contexts for shared mmap writes */ 168 struct list_head open_files; 169 170 /* Number of in-flight sillydelete RPC calls */ 171 atomic_t silly_count; 172 /* List of deferred sillydelete requests */ 173 struct hlist_head silly_list; 174 wait_queue_head_t waitqueue; 175 176 #if IS_ENABLED(CONFIG_NFS_V4) 177 struct nfs4_cached_acl *nfs4_acl; 178 /* NFSv4 state */ 179 struct list_head open_states; 180 struct nfs_delegation __rcu *delegation; 181 fmode_t delegation_state; 182 struct rw_semaphore rwsem; 183 184 /* pNFS layout information */ 185 struct pnfs_layout_hdr *layout; 186 #endif /* CONFIG_NFS_V4*/ 187 /* how many bytes have been written/read and how many bytes queued up */ 188 __u64 write_io; 189 __u64 read_io; 190 #ifdef CONFIG_NFS_FSCACHE 191 struct fscache_cookie *fscache; 192 #endif 193 struct inode vfs_inode; 194 }; 195 196 /* 197 * Cache validity bit flags 198 */ 199 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */ 200 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */ 201 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */ 202 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */ 203 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */ 204 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */ 205 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */ 206 #define NFS_INO_INVALID_LABEL 0x0080 /* cached label is invalid */ 207 208 /* 209 * Bit offsets in flags field 210 */ 211 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */ 212 #define NFS_INO_STALE (1) /* possible stale inode */ 213 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ 214 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */ 215 #define NFS_INO_FLUSHING (4) /* inode is flushing out data */ 216 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */ 217 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */ 218 #define NFS_INO_COMMIT (7) /* inode is committing unstable writes */ 219 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */ 220 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */ 221 222 static inline struct nfs_inode *NFS_I(const struct inode *inode) 223 { 224 return container_of(inode, struct nfs_inode, vfs_inode); 225 } 226 227 static inline struct nfs_server *NFS_SB(const struct super_block *s) 228 { 229 return (struct nfs_server *)(s->s_fs_info); 230 } 231 232 static inline struct nfs_fh *NFS_FH(const struct inode *inode) 233 { 234 return &NFS_I(inode)->fh; 235 } 236 237 static inline struct nfs_server *NFS_SERVER(const struct inode *inode) 238 { 239 return NFS_SB(inode->i_sb); 240 } 241 242 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) 243 { 244 return NFS_SERVER(inode)->client; 245 } 246 247 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) 248 { 249 return NFS_SERVER(inode)->nfs_client->rpc_ops; 250 } 251 252 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) 253 { 254 struct nfs_server *nfss = NFS_SERVER(inode); 255 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; 256 } 257 258 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) 259 { 260 struct nfs_server *nfss = NFS_SERVER(inode); 261 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; 262 } 263 264 static inline int NFS_STALE(const struct inode *inode) 265 { 266 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 267 } 268 269 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode) 270 { 271 #ifdef CONFIG_NFS_FSCACHE 272 return NFS_I(inode)->fscache; 273 #else 274 return NULL; 275 #endif 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 void nfs_set_verifier(struct dentry * dentry, unsigned long verf) 305 { 306 dentry->d_time = verf; 307 } 308 309 /** 310 * nfs_save_change_attribute - Returns the inode attribute change cookie 311 * @dir - pointer to parent directory inode 312 * The "change attribute" is updated every time we finish an operation 313 * that will result in a metadata change on the server. 314 */ 315 static inline unsigned long nfs_save_change_attribute(struct inode *dir) 316 { 317 return NFS_I(dir)->cache_change_attribute; 318 } 319 320 /** 321 * nfs_verify_change_attribute - Detects NFS remote directory changes 322 * @dir - pointer to parent directory inode 323 * @chattr - previously saved change attribute 324 * Return "false" if the verifiers doesn't match the change attribute. 325 * This would usually indicate that the directory contents have changed on 326 * the server, and that any dentries need revalidating. 327 */ 328 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr) 329 { 330 return chattr == NFS_I(dir)->cache_change_attribute; 331 } 332 333 /* 334 * linux/fs/nfs/inode.c 335 */ 336 extern int nfs_sync_mapping(struct address_space *mapping); 337 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); 338 extern void nfs_zap_caches(struct inode *); 339 extern void nfs_invalidate_atime(struct inode *); 340 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, 341 struct nfs_fattr *, struct nfs4_label *); 342 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); 343 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); 344 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); 345 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); 346 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *); 347 extern void nfs_access_set_mask(struct nfs_access_entry *, u32); 348 extern int nfs_permission(struct inode *, int); 349 extern int nfs_open(struct inode *, struct file *); 350 extern int nfs_release(struct inode *, struct file *); 351 extern int nfs_attribute_timeout(struct inode *inode); 352 extern int nfs_attribute_cache_expired(struct inode *inode); 353 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode); 354 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); 355 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); 356 extern int nfs_setattr(struct dentry *, struct iattr *); 357 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr); 358 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 359 struct nfs4_label *label); 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_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode); 364 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx); 365 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx); 366 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); 367 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); 368 extern u64 nfs_compat_user_ino64(u64 fileid); 369 extern void nfs_fattr_init(struct nfs_fattr *fattr); 370 extern unsigned long nfs_inc_attr_generation_counter(void); 371 372 extern struct nfs_fattr *nfs_alloc_fattr(void); 373 374 static inline void nfs_free_fattr(const struct nfs_fattr *fattr) 375 { 376 kfree(fattr); 377 } 378 379 extern struct nfs_fh *nfs_alloc_fhandle(void); 380 381 static inline void nfs_free_fhandle(const struct nfs_fh *fh) 382 { 383 kfree(fh); 384 } 385 386 #ifdef NFS_DEBUG 387 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh); 388 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 389 { 390 return _nfs_display_fhandle_hash(fh); 391 } 392 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption); 393 #define nfs_display_fhandle(fh, caption) \ 394 do { \ 395 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \ 396 _nfs_display_fhandle(fh, caption); \ 397 } while (0) 398 #else 399 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 400 { 401 return 0; 402 } 403 static inline void nfs_display_fhandle(const struct nfs_fh *fh, 404 const char *caption) 405 { 406 } 407 #endif 408 409 /* 410 * linux/fs/nfs/nfsroot.c 411 */ 412 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/ 413 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ 414 extern __be32 root_nfs_parse_addr(char *name); /*__init*/ 415 416 /* 417 * linux/fs/nfs/file.c 418 */ 419 extern const struct file_operations nfs_file_operations; 420 #if IS_ENABLED(CONFIG_NFS_V4) 421 extern const struct file_operations nfs4_file_operations; 422 #endif /* CONFIG_NFS_V4 */ 423 extern const struct address_space_operations nfs_file_aops; 424 extern const struct address_space_operations nfs_dir_aops; 425 426 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) 427 { 428 return filp->private_data; 429 } 430 431 static inline struct rpc_cred *nfs_file_cred(struct file *file) 432 { 433 if (file != NULL) { 434 struct nfs_open_context *ctx = 435 nfs_file_open_context(file); 436 if (ctx) 437 return ctx->cred; 438 } 439 return NULL; 440 } 441 442 /* 443 * linux/fs/nfs/xattr.c 444 */ 445 #ifdef CONFIG_NFS_V3_ACL 446 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t); 447 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t); 448 extern int nfs3_setxattr(struct dentry *, const char *, 449 const void *, size_t, int); 450 extern int nfs3_removexattr (struct dentry *, const char *name); 451 #else 452 # define nfs3_listxattr NULL 453 # define nfs3_getxattr NULL 454 # define nfs3_setxattr NULL 455 # define nfs3_removexattr NULL 456 #endif 457 458 /* 459 * linux/fs/nfs/direct.c 460 */ 461 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t, 462 unsigned long); 463 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, 464 const struct iovec *iov, unsigned long nr_segs, 465 loff_t pos, bool uio); 466 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, 467 const struct iovec *iov, unsigned long nr_segs, 468 loff_t pos, bool uio); 469 470 /* 471 * linux/fs/nfs/dir.c 472 */ 473 extern const struct file_operations nfs_dir_operations; 474 extern const struct dentry_operations nfs_dentry_operations; 475 476 extern void nfs_force_lookup_revalidate(struct inode *dir); 477 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, 478 struct nfs_fattr *fattr, struct nfs4_label *label); 479 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags); 480 extern void nfs_access_zap_cache(struct inode *inode); 481 482 /* 483 * linux/fs/nfs/symlink.c 484 */ 485 extern const struct inode_operations nfs_symlink_inode_operations; 486 487 /* 488 * linux/fs/nfs/sysctl.c 489 */ 490 #ifdef CONFIG_SYSCTL 491 extern int nfs_register_sysctl(void); 492 extern void nfs_unregister_sysctl(void); 493 #else 494 #define nfs_register_sysctl() 0 495 #define nfs_unregister_sysctl() do { } while(0) 496 #endif 497 498 /* 499 * linux/fs/nfs/namespace.c 500 */ 501 extern const struct inode_operations nfs_mountpoint_inode_operations; 502 extern const struct inode_operations nfs_referral_inode_operations; 503 extern int nfs_mountpoint_expiry_timeout; 504 extern void nfs_release_automount_timer(void); 505 506 /* 507 * linux/fs/nfs/unlink.c 508 */ 509 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); 510 extern void nfs_wait_on_sillyrename(struct dentry *dentry); 511 extern void nfs_block_sillyrename(struct dentry *dentry); 512 extern void nfs_unblock_sillyrename(struct dentry *dentry); 513 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 514 515 /* 516 * linux/fs/nfs/write.c 517 */ 518 extern int nfs_congestion_kb; 519 extern int nfs_writepage(struct page *page, struct writeback_control *wbc); 520 extern int nfs_writepages(struct address_space *, struct writeback_control *); 521 extern int nfs_flush_incompatible(struct file *file, struct page *page); 522 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); 523 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *); 524 525 /* 526 * Try to write back everything synchronously (but check the 527 * return value!) 528 */ 529 extern int nfs_wb_all(struct inode *inode); 530 extern int nfs_wb_page(struct inode *inode, struct page* page); 531 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); 532 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 533 extern int nfs_commit_inode(struct inode *, int); 534 extern struct nfs_commit_data *nfs_commitdata_alloc(void); 535 extern void nfs_commit_free(struct nfs_commit_data *data); 536 #else 537 static inline int 538 nfs_commit_inode(struct inode *inode, int how) 539 { 540 return 0; 541 } 542 #endif 543 544 static inline int 545 nfs_have_writebacks(struct inode *inode) 546 { 547 return NFS_I(inode)->npages != 0; 548 } 549 550 /* 551 * linux/fs/nfs/read.c 552 */ 553 extern int nfs_readpage(struct file *, struct page *); 554 extern int nfs_readpages(struct file *, struct address_space *, 555 struct list_head *, unsigned); 556 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *); 557 extern int nfs_readpage_async(struct nfs_open_context *, struct inode *, 558 struct page *); 559 560 /* 561 * linux/fs/nfs3proc.c 562 */ 563 #ifdef CONFIG_NFS_V3_ACL 564 extern struct posix_acl *nfs3_get_acl(struct inode *inode, int type); 565 extern int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type); 566 extern int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 567 struct posix_acl *dfacl); 568 extern const struct xattr_handler *nfs3_xattr_handlers[]; 569 #else 570 static inline int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 571 struct posix_acl *dfacl) 572 { 573 return 0; 574 } 575 #endif /* CONFIG_NFS_V3_ACL */ 576 577 /* 578 * inline functions 579 */ 580 581 static inline loff_t nfs_size_to_loff_t(__u64 size) 582 { 583 if (size > (__u64) OFFSET_MAX - 1) 584 return OFFSET_MAX - 1; 585 return (loff_t) size; 586 } 587 588 static inline ino_t 589 nfs_fileid_to_ino_t(u64 fileid) 590 { 591 ino_t ino = (ino_t) fileid; 592 if (sizeof(ino_t) < sizeof(u64)) 593 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; 594 return ino; 595 } 596 597 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) 598 599 600 # undef ifdebug 601 # ifdef NFS_DEBUG 602 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) 603 # define NFS_IFDEBUG(x) x 604 # else 605 # define ifdebug(fac) if (0) 606 # define NFS_IFDEBUG(x) 607 # endif 608 #endif 609