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 #ifdef CONFIG_NFS_FSCACHE 35 #include <linux/netfs.h> 36 #endif 37 38 #include <linux/nfs.h> 39 #include <linux/nfs2.h> 40 #include <linux/nfs3.h> 41 #include <linux/nfs4.h> 42 #include <linux/nfs_xdr.h> 43 #include <linux/nfs_fs_sb.h> 44 45 #include <linux/mempool.h> 46 47 /* 48 * These are the default for number of transports to different server IPs 49 */ 50 #define NFS_MAX_TRANSPORTS 16 51 52 /* 53 * Size of the NFS directory verifier 54 */ 55 #define NFS_DIR_VERIFIER_SIZE 2 56 57 /* 58 * NFSv3/v4 Access mode cache entry 59 */ 60 struct nfs_access_entry { 61 struct rb_node rb_node; 62 struct list_head lru; 63 kuid_t fsuid; 64 kgid_t fsgid; 65 struct group_info *group_info; 66 u64 timestamp; 67 __u32 mask; 68 struct rcu_head rcu_head; 69 }; 70 71 struct nfs_lock_context { 72 refcount_t count; 73 struct list_head list; 74 struct nfs_open_context *open_context; 75 fl_owner_t lockowner; 76 atomic_t io_count; 77 struct rcu_head rcu_head; 78 }; 79 80 struct nfs4_state; 81 struct nfs_open_context { 82 struct nfs_lock_context lock_context; 83 fl_owner_t flock_owner; 84 struct dentry *dentry; 85 const struct cred *cred; 86 struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */ 87 struct nfs4_state *state; 88 fmode_t mode; 89 90 unsigned long flags; 91 #define NFS_CONTEXT_BAD (2) 92 #define NFS_CONTEXT_UNLOCK (3) 93 #define NFS_CONTEXT_FILE_OPEN (4) 94 int error; 95 96 struct list_head list; 97 struct nfs4_threshold *mdsthreshold; 98 struct rcu_head rcu_head; 99 }; 100 101 struct nfs_open_dir_context { 102 struct list_head list; 103 atomic_t cache_hits; 104 atomic_t cache_misses; 105 unsigned long attr_gencount; 106 __be32 verf[NFS_DIR_VERIFIER_SIZE]; 107 __u64 dir_cookie; 108 __u64 last_cookie; 109 pgoff_t page_index; 110 unsigned int dtsize; 111 bool force_clear; 112 bool eof; 113 struct rcu_head rcu_head; 114 }; 115 116 /* 117 * NFSv4 delegation 118 */ 119 struct nfs_delegation; 120 121 struct posix_acl; 122 123 struct nfs4_xattr_cache; 124 125 /* 126 * nfs fs inode data in memory 127 */ 128 struct nfs_inode { 129 /* 130 * The 64bit 'inode number' 131 */ 132 __u64 fileid; 133 134 /* 135 * NFS file handle 136 */ 137 struct nfs_fh fh; 138 139 /* 140 * Various flags 141 */ 142 unsigned long flags; /* atomic bit ops */ 143 unsigned long cache_validity; /* bit mask */ 144 145 /* 146 * read_cache_jiffies is when we started read-caching this inode. 147 * attrtimeo is for how long the cached information is assumed 148 * to be valid. A successful attribute revalidation doubles 149 * attrtimeo (up to acregmax/acdirmax), a failure resets it to 150 * acregmin/acdirmin. 151 * 152 * We need to revalidate the cached attrs for this inode if 153 * 154 * jiffies - read_cache_jiffies >= attrtimeo 155 * 156 * Please note the comparison is greater than or equal 157 * so that zero timeout values can be specified. 158 */ 159 unsigned long read_cache_jiffies; 160 unsigned long attrtimeo; 161 unsigned long attrtimeo_timestamp; 162 163 unsigned long attr_gencount; 164 165 struct rb_root access_cache; 166 struct list_head access_cache_entry_lru; 167 struct list_head access_cache_inode_lru; 168 169 union { 170 /* Directory */ 171 struct { 172 /* "Generation counter" for the attribute cache. 173 * This is bumped whenever we update the metadata 174 * on the server. 175 */ 176 unsigned long cache_change_attribute; 177 /* 178 * This is the cookie verifier used for NFSv3 readdir 179 * operations 180 */ 181 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE]; 182 /* Readers: in-flight sillydelete RPC calls */ 183 /* Writers: rmdir */ 184 struct rw_semaphore rmdir_sem; 185 }; 186 /* Regular file */ 187 struct { 188 atomic_long_t nrequests; 189 atomic_long_t redirtied_pages; 190 struct nfs_mds_commit_info commit_info; 191 struct mutex commit_mutex; 192 }; 193 }; 194 195 /* Open contexts for shared mmap writes */ 196 struct list_head open_files; 197 198 /* Keep track of out-of-order replies. 199 * The ooo array contains start/end pairs of 200 * numbers from the changeid sequence when 201 * the inode's iversion has been updated. 202 * It also contains end/start pair (i.e. reverse order) 203 * of sections of the changeid sequence that have 204 * been seen in replies from the server. 205 * Normally these should match and when both 206 * A:B and B:A are found in ooo, they are both removed. 207 * And if a reply with A:B causes an iversion update 208 * of A:B, then neither are added. 209 * When a reply has pre_change that doesn't match 210 * iversion, then the changeid pair and any consequent 211 * change in iversion ARE added. Later replies 212 * might fill in the gaps, or possibly a gap is caused 213 * by a change from another client. 214 * When a file or directory is opened, if the ooo table 215 * is not empty, then we assume the gaps were due to 216 * another client and we invalidate the cached data. 217 * 218 * We can only track a limited number of concurrent gaps. 219 * Currently that limit is 16. 220 * We allocate the table on demand. If there is insufficient 221 * memory, then we probably cannot cache the file anyway 222 * so there is no loss. 223 */ 224 struct { 225 int cnt; 226 struct { 227 u64 start, end; 228 } gap[16]; 229 } *ooo; 230 231 #if IS_ENABLED(CONFIG_NFS_V4) 232 struct nfs4_cached_acl *nfs4_acl; 233 /* NFSv4 state */ 234 struct list_head open_states; 235 struct nfs_delegation __rcu *delegation; 236 struct rw_semaphore rwsem; 237 238 /* pNFS layout information */ 239 struct pnfs_layout_hdr *layout; 240 #endif /* CONFIG_NFS_V4*/ 241 /* how many bytes have been written/read and how many bytes queued up */ 242 __u64 write_io; 243 __u64 read_io; 244 #ifdef CONFIG_NFS_V4_2 245 struct nfs4_xattr_cache *xattr_cache; 246 #endif 247 union { 248 struct inode vfs_inode; 249 #ifdef CONFIG_NFS_FSCACHE 250 struct netfs_inode netfs; /* netfs context and VFS inode */ 251 #endif 252 }; 253 }; 254 255 struct nfs4_copy_state { 256 struct list_head copies; 257 struct list_head src_copies; 258 nfs4_stateid stateid; 259 struct completion completion; 260 uint64_t count; 261 struct nfs_writeverf verf; 262 int error; 263 int flags; 264 struct nfs4_state *parent_src_state; 265 struct nfs4_state *parent_dst_state; 266 }; 267 268 /* 269 * Access bit flags 270 */ 271 #define NFS_ACCESS_READ 0x0001 272 #define NFS_ACCESS_LOOKUP 0x0002 273 #define NFS_ACCESS_MODIFY 0x0004 274 #define NFS_ACCESS_EXTEND 0x0008 275 #define NFS_ACCESS_DELETE 0x0010 276 #define NFS_ACCESS_EXECUTE 0x0020 277 #define NFS_ACCESS_XAREAD 0x0040 278 #define NFS_ACCESS_XAWRITE 0x0080 279 #define NFS_ACCESS_XALIST 0x0100 280 281 /* 282 * Cache validity bit flags 283 */ 284 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */ 285 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */ 286 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */ 287 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */ 288 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */ 289 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */ 290 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */ 291 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */ 292 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */ 293 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */ 294 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */ 295 #define NFS_INO_DATA_INVAL_DEFER \ 296 BIT(13) /* Deferred cache invalidation */ 297 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */ 298 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */ 299 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */ 300 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */ 301 302 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \ 303 | NFS_INO_INVALID_CTIME \ 304 | NFS_INO_INVALID_MTIME \ 305 | NFS_INO_INVALID_SIZE \ 306 | NFS_INO_INVALID_NLINK \ 307 | NFS_INO_INVALID_MODE \ 308 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */ 309 310 /* 311 * Bit offsets in flags field 312 */ 313 #define NFS_INO_STALE (1) /* possible stale inode */ 314 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ 315 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */ 316 #define NFS_INO_PRESERVE_UNLINKED (4) /* preserve file if removed while open */ 317 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */ 318 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */ 319 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */ 320 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */ 321 322 static inline struct nfs_inode *NFS_I(const struct inode *inode) 323 { 324 return container_of(inode, struct nfs_inode, vfs_inode); 325 } 326 327 static inline struct nfs_server *NFS_SB(const struct super_block *s) 328 { 329 return (struct nfs_server *)(s->s_fs_info); 330 } 331 332 static inline struct nfs_fh *NFS_FH(const struct inode *inode) 333 { 334 return &NFS_I(inode)->fh; 335 } 336 337 static inline struct nfs_server *NFS_SERVER(const struct inode *inode) 338 { 339 return NFS_SB(inode->i_sb); 340 } 341 342 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) 343 { 344 return NFS_SERVER(inode)->client; 345 } 346 347 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) 348 { 349 return NFS_SERVER(inode)->nfs_client->rpc_ops; 350 } 351 352 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) 353 { 354 struct nfs_server *nfss = NFS_SERVER(inode); 355 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; 356 } 357 358 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) 359 { 360 struct nfs_server *nfss = NFS_SERVER(inode); 361 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; 362 } 363 364 static inline int NFS_STALE(const struct inode *inode) 365 { 366 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 367 } 368 369 static inline __u64 NFS_FILEID(const struct inode *inode) 370 { 371 return NFS_I(inode)->fileid; 372 } 373 374 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid) 375 { 376 NFS_I(inode)->fileid = fileid; 377 } 378 379 static inline void nfs_mark_for_revalidate(struct inode *inode) 380 { 381 struct nfs_inode *nfsi = NFS_I(inode); 382 383 spin_lock(&inode->i_lock); 384 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 385 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | 386 NFS_INO_INVALID_SIZE; 387 if (S_ISDIR(inode->i_mode)) 388 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 389 spin_unlock(&inode->i_lock); 390 } 391 392 static inline int nfs_server_capable(const struct inode *inode, int cap) 393 { 394 return NFS_SERVER(inode)->caps & cap; 395 } 396 397 /** 398 * nfs_save_change_attribute - Returns the inode attribute change cookie 399 * @dir - pointer to parent directory inode 400 * The "cache change attribute" is updated when we need to revalidate 401 * our dentry cache after a directory was seen to change on the server. 402 */ 403 static inline unsigned long nfs_save_change_attribute(struct inode *dir) 404 { 405 return NFS_I(dir)->cache_change_attribute; 406 } 407 408 /* 409 * linux/fs/nfs/inode.c 410 */ 411 extern int nfs_sync_mapping(struct address_space *mapping); 412 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); 413 extern void nfs_zap_caches(struct inode *); 414 extern void nfs_set_inode_stale(struct inode *inode); 415 extern void nfs_invalidate_atime(struct inode *); 416 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, 417 struct nfs_fattr *); 418 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *); 419 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); 420 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); 421 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); 422 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr); 423 extern int nfs_getattr(struct mnt_idmap *, const struct path *, 424 struct kstat *, u32, unsigned int); 425 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *); 426 extern void nfs_access_set_mask(struct nfs_access_entry *, u32); 427 extern int nfs_permission(struct mnt_idmap *, struct inode *, int); 428 extern int nfs_open(struct inode *, struct file *); 429 extern int nfs_attribute_cache_expired(struct inode *inode); 430 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags); 431 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); 432 extern int nfs_clear_invalid_mapping(struct address_space *mapping); 433 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode); 434 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); 435 extern int nfs_revalidate_mapping_rcu(struct inode *inode); 436 extern int nfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *); 437 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *); 438 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr); 439 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); 440 extern void put_nfs_open_context(struct nfs_open_context *ctx); 441 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode); 442 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp); 443 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx); 444 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx); 445 extern void nfs_file_clear_open_context(struct file *flip); 446 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); 447 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); 448 extern u64 nfs_compat_user_ino64(u64 fileid); 449 extern void nfs_fattr_init(struct nfs_fattr *fattr); 450 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr); 451 extern unsigned long nfs_inc_attr_generation_counter(void); 452 453 extern struct nfs_fattr *nfs_alloc_fattr(void); 454 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server); 455 456 static inline void nfs4_label_free(struct nfs4_label *label) 457 { 458 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 459 if (label) { 460 kfree(label->label); 461 kfree(label); 462 } 463 #endif 464 } 465 466 static inline void nfs_free_fattr(const struct nfs_fattr *fattr) 467 { 468 if (fattr) 469 nfs4_label_free(fattr->label); 470 kfree(fattr); 471 } 472 473 extern struct nfs_fh *nfs_alloc_fhandle(void); 474 475 static inline void nfs_free_fhandle(const struct nfs_fh *fh) 476 { 477 kfree(fh); 478 } 479 480 #ifdef NFS_DEBUG 481 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh); 482 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 483 { 484 return _nfs_display_fhandle_hash(fh); 485 } 486 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption); 487 #define nfs_display_fhandle(fh, caption) \ 488 do { \ 489 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \ 490 _nfs_display_fhandle(fh, caption); \ 491 } while (0) 492 #else 493 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 494 { 495 return 0; 496 } 497 static inline void nfs_display_fhandle(const struct nfs_fh *fh, 498 const char *caption) 499 { 500 } 501 #endif 502 503 /* 504 * linux/fs/nfs/nfsroot.c 505 */ 506 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/ 507 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ 508 extern __be32 root_nfs_parse_addr(char *name); /*__init*/ 509 510 /* 511 * linux/fs/nfs/file.c 512 */ 513 extern const struct file_operations nfs_file_operations; 514 #if IS_ENABLED(CONFIG_NFS_V4) 515 extern const struct file_operations nfs4_file_operations; 516 #endif /* CONFIG_NFS_V4 */ 517 extern const struct address_space_operations nfs_file_aops; 518 extern const struct address_space_operations nfs_dir_aops; 519 520 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) 521 { 522 return filp->private_data; 523 } 524 525 static inline const struct cred *nfs_file_cred(struct file *file) 526 { 527 if (file != NULL) { 528 struct nfs_open_context *ctx = 529 nfs_file_open_context(file); 530 if (ctx) 531 return ctx->cred; 532 } 533 return NULL; 534 } 535 536 /* 537 * linux/fs/nfs/direct.c 538 */ 539 int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter); 540 ssize_t nfs_file_direct_read(struct kiocb *iocb, 541 struct iov_iter *iter, bool swap); 542 ssize_t nfs_file_direct_write(struct kiocb *iocb, 543 struct iov_iter *iter, bool swap); 544 545 /* 546 * linux/fs/nfs/dir.c 547 */ 548 extern const struct file_operations nfs_dir_operations; 549 extern const struct dentry_operations nfs_dentry_operations; 550 551 extern void nfs_force_lookup_revalidate(struct inode *dir); 552 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf); 553 #if IS_ENABLED(CONFIG_NFS_V4) 554 extern void nfs_clear_verifier_delegated(struct inode *inode); 555 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 556 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry, 557 struct nfs_fh *fh, struct nfs_fattr *fattr); 558 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, 559 struct nfs_fattr *fattr); 560 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags); 561 extern void nfs_access_zap_cache(struct inode *inode); 562 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, 563 u32 *mask, bool may_block); 564 565 /* 566 * linux/fs/nfs/symlink.c 567 */ 568 extern const struct inode_operations nfs_symlink_inode_operations; 569 570 /* 571 * linux/fs/nfs/sysctl.c 572 */ 573 #ifdef CONFIG_SYSCTL 574 extern int nfs_register_sysctl(void); 575 extern void nfs_unregister_sysctl(void); 576 #else 577 #define nfs_register_sysctl() 0 578 #define nfs_unregister_sysctl() do { } while(0) 579 #endif 580 581 /* 582 * linux/fs/nfs/namespace.c 583 */ 584 extern const struct inode_operations nfs_mountpoint_inode_operations; 585 extern const struct inode_operations nfs_referral_inode_operations; 586 extern int nfs_mountpoint_expiry_timeout; 587 extern void nfs_release_automount_timer(void); 588 589 /* 590 * linux/fs/nfs/unlink.c 591 */ 592 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); 593 594 /* 595 * linux/fs/nfs/write.c 596 */ 597 extern int nfs_congestion_kb; 598 extern int nfs_writepages(struct address_space *, struct writeback_control *); 599 extern int nfs_flush_incompatible(struct file *file, struct folio *folio); 600 extern int nfs_update_folio(struct file *file, struct folio *folio, 601 unsigned int offset, unsigned int count); 602 603 /* 604 * Try to write back everything synchronously (but check the 605 * return value!) 606 */ 607 extern int nfs_sync_inode(struct inode *inode); 608 extern int nfs_wb_all(struct inode *inode); 609 extern int nfs_wb_folio(struct inode *inode, struct folio *folio); 610 int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio); 611 extern int nfs_commit_inode(struct inode *, int); 612 extern struct nfs_commit_data *nfs_commitdata_alloc(void); 613 extern void nfs_commit_free(struct nfs_commit_data *data); 614 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo); 615 616 static inline bool nfs_have_writebacks(const struct inode *inode) 617 { 618 if (S_ISREG(inode->i_mode)) 619 return atomic_long_read(&NFS_I(inode)->nrequests) != 0; 620 return false; 621 } 622 623 /* 624 * linux/fs/nfs/read.c 625 */ 626 int nfs_read_folio(struct file *, struct folio *); 627 void nfs_readahead(struct readahead_control *); 628 629 /* 630 * inline functions 631 */ 632 633 static inline loff_t nfs_size_to_loff_t(__u64 size) 634 { 635 return min_t(u64, size, OFFSET_MAX); 636 } 637 638 static inline ino_t 639 nfs_fileid_to_ino_t(u64 fileid) 640 { 641 ino_t ino = (ino_t) fileid; 642 if (sizeof(ino_t) < sizeof(u64)) 643 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; 644 return ino; 645 } 646 647 static inline void nfs_ooo_clear(struct nfs_inode *nfsi) 648 { 649 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER; 650 kfree(nfsi->ooo); 651 nfsi->ooo = NULL; 652 } 653 654 static inline bool nfs_ooo_test(struct nfs_inode *nfsi) 655 { 656 return (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) || 657 (nfsi->ooo && nfsi->ooo->cnt > 0); 658 659 } 660 661 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) 662 663 /* We need to block new opens while a file is being unlinked. 664 * If it is opened *before* we decide to unlink, we will silly-rename 665 * instead. If it is opened *after*, then we need to create or will fail. 666 * If we allow the two to race, we could end up with a file that is open 667 * but deleted on the server resulting in ESTALE. 668 * So use ->d_fsdata to record when the unlink is happening 669 * and block dentry revalidation while it is set. 670 */ 671 #define NFS_FSDATA_BLOCKED ((void*)1) 672 673 # undef ifdebug 674 # ifdef NFS_DEBUG 675 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) 676 # define NFS_IFDEBUG(x) x 677 # else 678 # define ifdebug(fac) if (0) 679 # define NFS_IFDEBUG(x) 680 # endif 681 #endif 682