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