1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/include/linux/nfs_fs.h 4 * 5 * Copyright (C) 1992 Rick Sladkey 6 * 7 * OS-specific nfs filesystem definitions and declarations 8 */ 9 #ifndef _LINUX_NFS_FS_H 10 #define _LINUX_NFS_FS_H 11 12 #include <uapi/linux/nfs_fs.h> 13 14 15 /* 16 * Enable dprintk() debugging support for nfs client. 17 */ 18 #ifdef CONFIG_NFS_DEBUG 19 # define NFS_DEBUG 20 #endif 21 22 #include <linux/in.h> 23 #include <linux/mm.h> 24 #include <linux/pagemap.h> 25 #include <linux/rbtree.h> 26 #include <linux/refcount.h> 27 #include <linux/rwsem.h> 28 #include <linux/wait.h> 29 30 #include <linux/sunrpc/debug.h> 31 #include <linux/sunrpc/auth.h> 32 #include <linux/sunrpc/clnt.h> 33 34 #include <linux/nfs.h> 35 #include <linux/nfs2.h> 36 #include <linux/nfs3.h> 37 #include <linux/nfs4.h> 38 #include <linux/nfs_xdr.h> 39 #include <linux/nfs_fs_sb.h> 40 41 #include <linux/mempool.h> 42 43 /* 44 * These are the default flags for swap requests 45 */ 46 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) 47 48 /* 49 * Size of the NFS directory verifier 50 */ 51 #define NFS_DIR_VERIFIER_SIZE 2 52 53 /* 54 * NFSv3/v4 Access mode cache entry 55 */ 56 struct nfs_access_entry { 57 struct rb_node rb_node; 58 struct list_head lru; 59 const struct cred * cred; 60 __u32 mask; 61 struct rcu_head rcu_head; 62 }; 63 64 struct nfs_lock_context { 65 refcount_t count; 66 struct list_head list; 67 struct nfs_open_context *open_context; 68 fl_owner_t lockowner; 69 atomic_t io_count; 70 struct rcu_head rcu_head; 71 }; 72 73 struct nfs4_state; 74 struct nfs_open_context { 75 struct nfs_lock_context lock_context; 76 fl_owner_t flock_owner; 77 struct dentry *dentry; 78 const struct cred *cred; 79 struct rpc_cred *ll_cred; /* low-level cred - use to check for expiry */ 80 struct nfs4_state *state; 81 fmode_t mode; 82 83 unsigned long flags; 84 #define NFS_CONTEXT_RESEND_WRITES (1) 85 #define NFS_CONTEXT_BAD (2) 86 #define NFS_CONTEXT_UNLOCK (3) 87 int error; 88 89 struct list_head list; 90 struct nfs4_threshold *mdsthreshold; 91 struct rcu_head rcu_head; 92 }; 93 94 struct nfs_open_dir_context { 95 struct list_head list; 96 unsigned long attr_gencount; 97 __be32 verf[NFS_DIR_VERIFIER_SIZE]; 98 __u64 dir_cookie; 99 __u64 dup_cookie; 100 signed char duped; 101 }; 102 103 /* 104 * NFSv4 delegation 105 */ 106 struct nfs_delegation; 107 108 struct posix_acl; 109 110 struct nfs4_xattr_cache; 111 112 /* 113 * nfs fs inode data in memory 114 */ 115 struct nfs_inode { 116 /* 117 * The 64bit 'inode number' 118 */ 119 __u64 fileid; 120 121 /* 122 * NFS file handle 123 */ 124 struct nfs_fh fh; 125 126 /* 127 * Various flags 128 */ 129 unsigned long flags; /* atomic bit ops */ 130 unsigned long cache_validity; /* bit mask */ 131 132 /* 133 * read_cache_jiffies is when we started read-caching this inode. 134 * attrtimeo is for how long the cached information is assumed 135 * to be valid. A successful attribute revalidation doubles 136 * attrtimeo (up to acregmax/acdirmax), a failure resets it to 137 * acregmin/acdirmin. 138 * 139 * We need to revalidate the cached attrs for this inode if 140 * 141 * jiffies - read_cache_jiffies >= attrtimeo 142 * 143 * Please note the comparison is greater than or equal 144 * so that zero timeout values can be specified. 145 */ 146 unsigned long read_cache_jiffies; 147 unsigned long attrtimeo; 148 unsigned long attrtimeo_timestamp; 149 150 unsigned long attr_gencount; 151 /* "Generation counter" for the attribute cache. This is 152 * bumped whenever we update the metadata on the 153 * server. 154 */ 155 unsigned long cache_change_attribute; 156 157 struct rb_root access_cache; 158 struct list_head access_cache_entry_lru; 159 struct list_head access_cache_inode_lru; 160 161 /* 162 * This is the cookie verifier used for NFSv3 readdir 163 * operations 164 */ 165 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE]; 166 167 atomic_long_t nrequests; 168 struct nfs_mds_commit_info commit_info; 169 170 /* Open contexts for shared mmap writes */ 171 struct list_head open_files; 172 173 /* Readers: in-flight sillydelete RPC calls */ 174 /* Writers: rmdir */ 175 struct rw_semaphore rmdir_sem; 176 struct mutex commit_mutex; 177 178 /* track last access to cached pages */ 179 unsigned long page_index; 180 181 #if IS_ENABLED(CONFIG_NFS_V4) 182 struct nfs4_cached_acl *nfs4_acl; 183 /* NFSv4 state */ 184 struct list_head open_states; 185 struct nfs_delegation __rcu *delegation; 186 struct rw_semaphore rwsem; 187 188 /* pNFS layout information */ 189 struct pnfs_layout_hdr *layout; 190 #endif /* CONFIG_NFS_V4*/ 191 /* how many bytes have been written/read and how many bytes queued up */ 192 __u64 write_io; 193 __u64 read_io; 194 #ifdef CONFIG_NFS_FSCACHE 195 struct fscache_cookie *fscache; 196 #endif 197 struct inode vfs_inode; 198 199 #ifdef CONFIG_NFS_V4_2 200 struct nfs4_xattr_cache *xattr_cache; 201 #endif 202 }; 203 204 struct nfs4_copy_state { 205 struct list_head copies; 206 struct list_head src_copies; 207 nfs4_stateid stateid; 208 struct completion completion; 209 uint64_t count; 210 struct nfs_writeverf verf; 211 int error; 212 int flags; 213 struct nfs4_state *parent_src_state; 214 struct nfs4_state *parent_dst_state; 215 }; 216 217 /* 218 * Access bit flags 219 */ 220 #define NFS_ACCESS_READ 0x0001 221 #define NFS_ACCESS_LOOKUP 0x0002 222 #define NFS_ACCESS_MODIFY 0x0004 223 #define NFS_ACCESS_EXTEND 0x0008 224 #define NFS_ACCESS_DELETE 0x0010 225 #define NFS_ACCESS_EXECUTE 0x0020 226 #define NFS_ACCESS_XAREAD 0x0040 227 #define NFS_ACCESS_XAWRITE 0x0080 228 #define NFS_ACCESS_XALIST 0x0100 229 230 /* 231 * Cache validity bit flags 232 */ 233 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */ 234 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */ 235 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */ 236 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */ 237 #define NFS_INO_REVAL_PAGECACHE BIT(5) /* must revalidate pagecache */ 238 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */ 239 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */ 240 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */ 241 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */ 242 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */ 243 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */ 244 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */ 245 #define NFS_INO_DATA_INVAL_DEFER \ 246 BIT(13) /* Deferred cache invalidation */ 247 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */ 248 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */ 249 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */ 250 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */ 251 252 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \ 253 | NFS_INO_INVALID_CTIME \ 254 | NFS_INO_INVALID_MTIME \ 255 | NFS_INO_INVALID_SIZE \ 256 | NFS_INO_INVALID_NLINK \ 257 | NFS_INO_INVALID_MODE \ 258 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */ 259 260 /* 261 * Bit offsets in flags field 262 */ 263 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */ 264 #define NFS_INO_STALE (1) /* possible stale inode */ 265 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ 266 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */ 267 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */ 268 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */ 269 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */ 270 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */ 271 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */ 272 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */ 273 274 static inline struct nfs_inode *NFS_I(const struct inode *inode) 275 { 276 return container_of(inode, struct nfs_inode, vfs_inode); 277 } 278 279 static inline struct nfs_server *NFS_SB(const struct super_block *s) 280 { 281 return (struct nfs_server *)(s->s_fs_info); 282 } 283 284 static inline struct nfs_fh *NFS_FH(const struct inode *inode) 285 { 286 return &NFS_I(inode)->fh; 287 } 288 289 static inline struct nfs_server *NFS_SERVER(const struct inode *inode) 290 { 291 return NFS_SB(inode->i_sb); 292 } 293 294 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) 295 { 296 return NFS_SERVER(inode)->client; 297 } 298 299 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) 300 { 301 return NFS_SERVER(inode)->nfs_client->rpc_ops; 302 } 303 304 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) 305 { 306 struct nfs_server *nfss = NFS_SERVER(inode); 307 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; 308 } 309 310 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) 311 { 312 struct nfs_server *nfss = NFS_SERVER(inode); 313 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; 314 } 315 316 static inline int NFS_STALE(const struct inode *inode) 317 { 318 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 319 } 320 321 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode) 322 { 323 #ifdef CONFIG_NFS_FSCACHE 324 return NFS_I(inode)->fscache; 325 #else 326 return NULL; 327 #endif 328 } 329 330 static inline __u64 NFS_FILEID(const struct inode *inode) 331 { 332 return NFS_I(inode)->fileid; 333 } 334 335 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid) 336 { 337 NFS_I(inode)->fileid = fileid; 338 } 339 340 static inline void nfs_mark_for_revalidate(struct inode *inode) 341 { 342 struct nfs_inode *nfsi = NFS_I(inode); 343 344 spin_lock(&inode->i_lock); 345 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE 346 | NFS_INO_INVALID_ACCESS 347 | NFS_INO_INVALID_ACL 348 | NFS_INO_INVALID_CHANGE 349 | NFS_INO_INVALID_CTIME; 350 if (S_ISDIR(inode->i_mode)) 351 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 352 spin_unlock(&inode->i_lock); 353 } 354 355 static inline int nfs_server_capable(struct inode *inode, int cap) 356 { 357 return NFS_SERVER(inode)->caps & cap; 358 } 359 360 /** 361 * nfs_save_change_attribute - Returns the inode attribute change cookie 362 * @dir - pointer to parent directory inode 363 * The "cache change attribute" is updated when we need to revalidate 364 * our dentry cache after a directory was seen to change on the server. 365 */ 366 static inline unsigned long nfs_save_change_attribute(struct inode *dir) 367 { 368 return NFS_I(dir)->cache_change_attribute; 369 } 370 371 /* 372 * linux/fs/nfs/inode.c 373 */ 374 extern int nfs_sync_mapping(struct address_space *mapping); 375 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); 376 extern void nfs_zap_caches(struct inode *); 377 extern void nfs_set_inode_stale(struct inode *inode); 378 extern void nfs_invalidate_atime(struct inode *); 379 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, 380 struct nfs_fattr *, struct nfs4_label *); 381 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *); 382 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); 383 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); 384 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); 385 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr); 386 extern int nfs_getattr(struct user_namespace *, const struct path *, 387 struct kstat *, u32, unsigned int); 388 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *); 389 extern void nfs_access_set_mask(struct nfs_access_entry *, u32); 390 extern int nfs_permission(struct user_namespace *, struct inode *, int); 391 extern int nfs_open(struct inode *, struct file *); 392 extern int nfs_attribute_cache_expired(struct inode *inode); 393 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags); 394 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); 395 extern int nfs_clear_invalid_mapping(struct address_space *mapping); 396 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode); 397 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); 398 extern int nfs_revalidate_mapping_rcu(struct inode *inode); 399 extern int nfs_setattr(struct user_namespace *, struct dentry *, struct iattr *); 400 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *); 401 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 402 struct nfs4_label *label); 403 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); 404 extern void put_nfs_open_context(struct nfs_open_context *ctx); 405 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode); 406 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp); 407 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx); 408 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx); 409 extern void nfs_file_clear_open_context(struct file *flip); 410 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); 411 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); 412 extern u64 nfs_compat_user_ino64(u64 fileid); 413 extern void nfs_fattr_init(struct nfs_fattr *fattr); 414 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr); 415 extern unsigned long nfs_inc_attr_generation_counter(void); 416 417 extern struct nfs_fattr *nfs_alloc_fattr(void); 418 419 static inline void nfs_free_fattr(const struct nfs_fattr *fattr) 420 { 421 kfree(fattr); 422 } 423 424 extern struct nfs_fh *nfs_alloc_fhandle(void); 425 426 static inline void nfs_free_fhandle(const struct nfs_fh *fh) 427 { 428 kfree(fh); 429 } 430 431 #ifdef NFS_DEBUG 432 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh); 433 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 434 { 435 return _nfs_display_fhandle_hash(fh); 436 } 437 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption); 438 #define nfs_display_fhandle(fh, caption) \ 439 do { \ 440 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \ 441 _nfs_display_fhandle(fh, caption); \ 442 } while (0) 443 #else 444 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 445 { 446 return 0; 447 } 448 static inline void nfs_display_fhandle(const struct nfs_fh *fh, 449 const char *caption) 450 { 451 } 452 #endif 453 454 /* 455 * linux/fs/nfs/nfsroot.c 456 */ 457 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/ 458 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ 459 extern __be32 root_nfs_parse_addr(char *name); /*__init*/ 460 461 /* 462 * linux/fs/nfs/file.c 463 */ 464 extern const struct file_operations nfs_file_operations; 465 #if IS_ENABLED(CONFIG_NFS_V4) 466 extern const struct file_operations nfs4_file_operations; 467 #endif /* CONFIG_NFS_V4 */ 468 extern const struct address_space_operations nfs_file_aops; 469 extern const struct address_space_operations nfs_dir_aops; 470 471 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) 472 { 473 return filp->private_data; 474 } 475 476 static inline const struct cred *nfs_file_cred(struct file *file) 477 { 478 if (file != NULL) { 479 struct nfs_open_context *ctx = 480 nfs_file_open_context(file); 481 if (ctx) 482 return ctx->cred; 483 } 484 return NULL; 485 } 486 487 /* 488 * linux/fs/nfs/direct.c 489 */ 490 extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *); 491 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, 492 struct iov_iter *iter); 493 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, 494 struct iov_iter *iter); 495 496 /* 497 * linux/fs/nfs/dir.c 498 */ 499 extern const struct file_operations nfs_dir_operations; 500 extern const struct dentry_operations nfs_dentry_operations; 501 502 extern void nfs_force_lookup_revalidate(struct inode *dir); 503 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf); 504 #if IS_ENABLED(CONFIG_NFS_V4) 505 extern void nfs_clear_verifier_delegated(struct inode *inode); 506 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 507 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry, 508 struct nfs_fh *fh, struct nfs_fattr *fattr, 509 struct nfs4_label *label); 510 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, 511 struct nfs_fattr *fattr, struct nfs4_label *label); 512 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags); 513 extern void nfs_access_zap_cache(struct inode *inode); 514 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, 515 bool may_block); 516 517 /* 518 * linux/fs/nfs/symlink.c 519 */ 520 extern const struct inode_operations nfs_symlink_inode_operations; 521 522 /* 523 * linux/fs/nfs/sysctl.c 524 */ 525 #ifdef CONFIG_SYSCTL 526 extern int nfs_register_sysctl(void); 527 extern void nfs_unregister_sysctl(void); 528 #else 529 #define nfs_register_sysctl() 0 530 #define nfs_unregister_sysctl() do { } while(0) 531 #endif 532 533 /* 534 * linux/fs/nfs/namespace.c 535 */ 536 extern const struct inode_operations nfs_mountpoint_inode_operations; 537 extern const struct inode_operations nfs_referral_inode_operations; 538 extern int nfs_mountpoint_expiry_timeout; 539 extern void nfs_release_automount_timer(void); 540 541 /* 542 * linux/fs/nfs/unlink.c 543 */ 544 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); 545 546 /* 547 * linux/fs/nfs/write.c 548 */ 549 extern int nfs_congestion_kb; 550 extern int nfs_writepage(struct page *page, struct writeback_control *wbc); 551 extern int nfs_writepages(struct address_space *, struct writeback_control *); 552 extern int nfs_flush_incompatible(struct file *file, struct page *page); 553 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); 554 555 /* 556 * Try to write back everything synchronously (but check the 557 * return value!) 558 */ 559 extern int nfs_sync_inode(struct inode *inode); 560 extern int nfs_wb_all(struct inode *inode); 561 extern int nfs_wb_page(struct inode *inode, struct page *page); 562 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); 563 extern int nfs_commit_inode(struct inode *, int); 564 extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail); 565 extern void nfs_commit_free(struct nfs_commit_data *data); 566 567 static inline int 568 nfs_have_writebacks(struct inode *inode) 569 { 570 return atomic_long_read(&NFS_I(inode)->nrequests) != 0; 571 } 572 573 /* 574 * linux/fs/nfs/read.c 575 */ 576 extern int nfs_readpage(struct file *, struct page *); 577 extern int nfs_readpages(struct file *, struct address_space *, 578 struct list_head *, unsigned); 579 580 /* 581 * inline functions 582 */ 583 584 static inline loff_t nfs_size_to_loff_t(__u64 size) 585 { 586 return min_t(u64, size, OFFSET_MAX); 587 } 588 589 static inline ino_t 590 nfs_fileid_to_ino_t(u64 fileid) 591 { 592 ino_t ino = (ino_t) fileid; 593 if (sizeof(ino_t) < sizeof(u64)) 594 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; 595 return ino; 596 } 597 598 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) 599 600 601 # undef ifdebug 602 # ifdef NFS_DEBUG 603 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) 604 # define NFS_IFDEBUG(x) x 605 # else 606 # define ifdebug(fac) if (0) 607 # define NFS_IFDEBUG(x) 608 # endif 609 #endif 610