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 nfs_file_localio { 81 struct nfsd_file __rcu *ro_file; 82 struct nfsd_file __rcu *rw_file; 83 struct list_head list; 84 void __rcu *nfs_uuid; /* opaque pointer to 'nfs_uuid_t' */ 85 }; 86 87 static inline void nfs_localio_file_init(struct nfs_file_localio *nfl) 88 { 89 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 90 nfl->ro_file = NULL; 91 nfl->rw_file = NULL; 92 INIT_LIST_HEAD(&nfl->list); 93 nfl->nfs_uuid = NULL; 94 #endif 95 } 96 97 struct nfs4_state; 98 struct nfs_open_context { 99 struct nfs_lock_context lock_context; 100 fl_owner_t flock_owner; 101 struct dentry *dentry; 102 const struct cred *cred; 103 struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */ 104 struct nfs4_state *state; 105 fmode_t mode; 106 107 int error; 108 unsigned long flags; 109 #define NFS_CONTEXT_BAD (2) 110 #define NFS_CONTEXT_UNLOCK (3) 111 #define NFS_CONTEXT_FILE_OPEN (4) 112 #define NFS_CONTEXT_WRITE_SYNC (5) 113 #define NFS_CONTEXT_O_DIRECT (6) 114 115 struct nfs4_threshold *mdsthreshold; 116 struct list_head list; 117 struct rcu_head rcu_head; 118 struct nfs_file_localio nfl; 119 }; 120 121 struct nfs_open_dir_context { 122 struct list_head list; 123 atomic_t cache_hits; 124 atomic_t cache_misses; 125 unsigned long attr_gencount; 126 __be32 verf[NFS_DIR_VERIFIER_SIZE]; 127 __u64 dir_cookie; 128 __u64 last_cookie; 129 pgoff_t page_index; 130 unsigned int dtsize; 131 bool force_clear; 132 bool eof; 133 struct rcu_head rcu_head; 134 }; 135 136 /* 137 * NFSv4 delegation 138 */ 139 struct nfs_delegation; 140 141 struct posix_acl; 142 143 struct nfs4_xattr_cache; 144 145 /* 146 * nfs fs inode data in memory 147 */ 148 struct nfs_inode { 149 /* 150 * NFS file handle 151 */ 152 struct nfs_fh fh; 153 154 /* 155 * Various flags 156 */ 157 unsigned long flags; /* atomic bit ops */ 158 unsigned long cache_validity; /* bit mask */ 159 160 /* 161 * NFS Attributes not included in struct inode 162 */ 163 164 struct timespec64 btime; 165 166 bool uncacheable_file_data : 1; 167 168 /* 169 * read_cache_jiffies is when we started read-caching this inode. 170 * attrtimeo is for how long the cached information is assumed 171 * to be valid. A successful attribute revalidation doubles 172 * attrtimeo (up to acregmax/acdirmax), a failure resets it to 173 * acregmin/acdirmin. 174 * 175 * We need to revalidate the cached attrs for this inode if 176 * 177 * jiffies - read_cache_jiffies >= attrtimeo 178 * 179 * Please note the comparison is greater than or equal 180 * so that zero timeout values can be specified. 181 */ 182 unsigned long read_cache_jiffies; 183 unsigned long attrtimeo; 184 unsigned long attrtimeo_timestamp; 185 186 unsigned long attr_gencount; 187 188 struct rb_root access_cache; 189 struct list_head access_cache_entry_lru; 190 struct list_head access_cache_inode_lru; 191 192 union { 193 /* Directory */ 194 struct { 195 /* "Generation counter" for the attribute cache. 196 * This is bumped whenever we update the metadata 197 * on the server. 198 */ 199 unsigned long cache_change_attribute; 200 /* 201 * This is the cookie verifier used for NFSv3 readdir 202 * operations 203 */ 204 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE]; 205 /* Readers: in-flight sillydelete RPC calls */ 206 /* Writers: rmdir */ 207 struct rw_semaphore rmdir_sem; 208 }; 209 /* Regular file */ 210 struct { 211 atomic_long_t nrequests; 212 atomic_long_t redirtied_pages; 213 struct nfs_mds_commit_info commit_info; 214 struct mutex commit_mutex; 215 }; 216 }; 217 218 /* Open contexts for shared mmap writes */ 219 struct list_head open_files; 220 221 /* Keep track of out-of-order replies. 222 * The ooo array contains start/end pairs of 223 * numbers from the changeid sequence when 224 * the inode's iversion has been updated. 225 * It also contains end/start pair (i.e. reverse order) 226 * of sections of the changeid sequence that have 227 * been seen in replies from the server. 228 * Normally these should match and when both 229 * A:B and B:A are found in ooo, they are both removed. 230 * And if a reply with A:B causes an iversion update 231 * of A:B, then neither are added. 232 * When a reply has pre_change that doesn't match 233 * iversion, then the changeid pair and any consequent 234 * change in iversion ARE added. Later replies 235 * might fill in the gaps, or possibly a gap is caused 236 * by a change from another client. 237 * When a file or directory is opened, if the ooo table 238 * is not empty, then we assume the gaps were due to 239 * another client and we invalidate the cached data. 240 * 241 * We can only track a limited number of concurrent gaps. 242 * Currently that limit is 16. 243 * We allocate the table on demand. If there is insufficient 244 * memory, then we probably cannot cache the file anyway 245 * so there is no loss. 246 */ 247 struct { 248 int cnt; 249 struct { 250 u64 start, end; 251 } gap[16]; 252 } *ooo; 253 254 #if IS_ENABLED(CONFIG_NFS_V4) 255 struct nfs4_cached_acl *nfs4_acl; 256 /* NFSv4 state */ 257 struct list_head open_states; 258 struct nfs_delegation __rcu *delegation; 259 struct rw_semaphore rwsem; 260 261 /* pNFS layout information */ 262 struct pnfs_layout_hdr *layout; 263 #endif /* CONFIG_NFS_V4*/ 264 /* how many bytes have been written/read and how many bytes queued up */ 265 __u64 write_io; 266 __u64 read_io; 267 #ifdef CONFIG_NFS_V4_2 268 struct nfs4_xattr_cache *xattr_cache; 269 #endif 270 union { 271 struct inode vfs_inode; 272 #ifdef CONFIG_NFS_FSCACHE 273 struct netfs_inode netfs; /* netfs context and VFS inode */ 274 #endif 275 }; 276 }; 277 278 struct nfs4_copy_state { 279 struct list_head copies; 280 struct list_head src_copies; 281 nfs4_stateid stateid; 282 struct completion completion; 283 uint64_t count; 284 struct nfs_writeverf verf; 285 int error; 286 int flags; 287 struct nfs4_state *parent_src_state; 288 struct nfs4_state *parent_dst_state; 289 }; 290 291 /* 292 * Access bit flags 293 */ 294 #define NFS_ACCESS_READ 0x0001 295 #define NFS_ACCESS_LOOKUP 0x0002 296 #define NFS_ACCESS_MODIFY 0x0004 297 #define NFS_ACCESS_EXTEND 0x0008 298 #define NFS_ACCESS_DELETE 0x0010 299 #define NFS_ACCESS_EXECUTE 0x0020 300 #define NFS_ACCESS_XAREAD 0x0040 301 #define NFS_ACCESS_XAWRITE 0x0080 302 #define NFS_ACCESS_XALIST 0x0100 303 304 /* 305 * Cache validity bit flags 306 */ 307 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */ 308 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */ 309 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */ 310 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */ 311 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */ 312 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */ 313 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */ 314 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */ 315 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */ 316 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */ 317 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */ 318 #define NFS_INO_DATA_INVAL_DEFER \ 319 BIT(13) /* Deferred cache invalidation */ 320 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */ 321 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */ 322 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */ 323 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */ 324 #define NFS_INO_INVALID_BTIME BIT(18) /* cached btime is invalid */ 325 #define NFS_INO_INVALID_UNCACHEABLE_FILE_DATA BIT(19) /* cached uncacheable_file_data is invalid */ 326 327 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \ 328 | NFS_INO_INVALID_CTIME \ 329 | NFS_INO_INVALID_MTIME \ 330 | NFS_INO_INVALID_BTIME \ 331 | NFS_INO_INVALID_SIZE \ 332 | NFS_INO_INVALID_NLINK \ 333 | NFS_INO_INVALID_MODE \ 334 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */ 335 336 /* 337 * Bit offsets in flags field 338 */ 339 #define NFS_INO_STALE (1) /* possible stale inode */ 340 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ 341 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */ 342 #define NFS_INO_PRESERVE_UNLINKED (4) /* preserve file if removed while open */ 343 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */ 344 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */ 345 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */ 346 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */ 347 #define NFS_INO_REQ_DIR_DELEG (13) /* Request a directory delegation */ 348 349 static inline struct nfs_inode *NFS_I(const struct inode *inode) 350 { 351 return container_of(inode, struct nfs_inode, vfs_inode); 352 } 353 354 static inline struct nfs_server *NFS_SB(const struct super_block *s) 355 { 356 return (struct nfs_server *)(s->s_fs_info); 357 } 358 359 static inline struct nfs_fh *NFS_FH(const struct inode *inode) 360 { 361 return &NFS_I(inode)->fh; 362 } 363 364 static inline struct nfs_server *NFS_SERVER(const struct inode *inode) 365 { 366 return NFS_SB(inode->i_sb); 367 } 368 369 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) 370 { 371 return NFS_SERVER(inode)->client; 372 } 373 374 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) 375 { 376 return NFS_SERVER(inode)->nfs_client->rpc_ops; 377 } 378 379 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) 380 { 381 struct nfs_server *nfss = NFS_SERVER(inode); 382 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; 383 } 384 385 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) 386 { 387 struct nfs_server *nfss = NFS_SERVER(inode); 388 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; 389 } 390 391 static inline int NFS_STALE(const struct inode *inode) 392 { 393 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 394 } 395 396 static inline void nfs_mark_for_revalidate(struct inode *inode) 397 { 398 struct nfs_inode *nfsi = NFS_I(inode); 399 400 spin_lock(&inode->i_lock); 401 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 402 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | 403 NFS_INO_INVALID_SIZE; 404 if (S_ISDIR(inode->i_mode)) 405 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 406 spin_unlock(&inode->i_lock); 407 } 408 409 static inline int nfs_server_capable(const struct inode *inode, int cap) 410 { 411 return NFS_SERVER(inode)->caps & cap; 412 } 413 414 /** 415 * nfs_save_change_attribute - Returns the inode attribute change cookie 416 * @dir - pointer to parent directory inode 417 * The "cache change attribute" is updated when we need to revalidate 418 * our dentry cache after a directory was seen to change on the server. 419 */ 420 static inline unsigned long nfs_save_change_attribute(struct inode *dir) 421 { 422 return NFS_I(dir)->cache_change_attribute; 423 } 424 425 /* 426 * linux/fs/nfs/inode.c 427 */ 428 extern int nfs_sync_mapping(struct address_space *mapping); 429 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); 430 extern void nfs_zap_caches(struct inode *); 431 extern void nfs_set_inode_stale(struct inode *inode); 432 extern void nfs_invalidate_atime(struct inode *); 433 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, 434 struct nfs_fattr *); 435 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *); 436 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); 437 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); 438 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); 439 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr); 440 extern int nfs_getattr(const struct mnt_idmap *, const struct path *, 441 struct kstat *, u32, unsigned int); 442 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *); 443 extern void nfs_access_set_mask(struct nfs_access_entry *, u32); 444 extern int nfs_permission(const struct mnt_idmap *, struct inode *, int); 445 extern int nfs_open(struct inode *, struct file *); 446 extern int nfs_attribute_cache_expired(struct inode *inode); 447 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags); 448 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); 449 extern int nfs_clear_invalid_mapping(struct address_space *mapping); 450 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode); 451 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); 452 extern int nfs_revalidate_mapping_rcu(struct inode *inode); 453 extern int nfs_setattr(const struct mnt_idmap *, struct dentry *, struct iattr *); 454 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *); 455 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr); 456 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); 457 extern void put_nfs_open_context(struct nfs_open_context *ctx); 458 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode); 459 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp); 460 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx); 461 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx); 462 extern void nfs_file_clear_open_context(struct file *flip); 463 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); 464 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); 465 extern void nfs_fattr_init(struct nfs_fattr *fattr); 466 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr); 467 extern unsigned long nfs_inc_attr_generation_counter(void); 468 469 extern struct nfs_fattr *nfs_alloc_fattr(void); 470 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server); 471 472 static inline void nfs4_label_free(struct nfs4_label *label) 473 { 474 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 475 if (label) { 476 kfree(label->label); 477 kfree(label); 478 } 479 #endif 480 } 481 482 static inline void nfs_free_fattr(const struct nfs_fattr *fattr) 483 { 484 if (fattr) 485 nfs4_label_free(fattr->label); 486 kfree(fattr); 487 } 488 489 extern struct nfs_fh *nfs_alloc_fhandle(void); 490 491 static inline void nfs_free_fhandle(const struct nfs_fh *fh) 492 { 493 kfree(fh); 494 } 495 496 #ifdef NFS_DEBUG 497 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh); 498 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 499 { 500 return _nfs_display_fhandle_hash(fh); 501 } 502 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption); 503 #define nfs_display_fhandle(fh, caption) \ 504 do { \ 505 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \ 506 _nfs_display_fhandle(fh, caption); \ 507 } while (0) 508 #else 509 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) 510 { 511 return 0; 512 } 513 static inline void nfs_display_fhandle(const struct nfs_fh *fh, 514 const char *caption) 515 { 516 } 517 #endif 518 519 /* 520 * linux/fs/nfs/nfsroot.c 521 */ 522 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/ 523 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ 524 extern __be32 root_nfs_parse_addr(char *name); /*__init*/ 525 526 /* 527 * linux/fs/nfs/file.c 528 */ 529 extern const struct file_operations nfs_file_operations; 530 #if IS_ENABLED(CONFIG_NFS_V4) 531 extern const struct file_operations nfs4_file_operations; 532 #endif /* CONFIG_NFS_V4 */ 533 extern const struct address_space_operations nfs_file_aops; 534 extern const struct address_space_operations nfs_dir_aops; 535 536 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) 537 { 538 return filp->private_data; 539 } 540 541 static inline const struct cred *nfs_file_cred(struct file *file) 542 { 543 if (file != NULL) { 544 struct nfs_open_context *ctx = 545 nfs_file_open_context(file); 546 if (ctx) 547 return ctx->cred; 548 } 549 return NULL; 550 } 551 552 /* 553 * linux/fs/nfs/direct.c 554 */ 555 ssize_t nfs_file_direct_read(struct kiocb *iocb, 556 struct iov_iter *iter, bool swap); 557 ssize_t nfs_file_direct_write(struct kiocb *iocb, 558 struct iov_iter *iter, bool swap); 559 560 /* 561 * linux/fs/nfs/dir.c 562 */ 563 extern const struct file_operations nfs_dir_operations; 564 extern const struct dentry_operations nfs_dentry_operations; 565 566 extern void nfs_force_lookup_revalidate(struct inode *dir); 567 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf); 568 #if IS_ENABLED(CONFIG_NFS_V4) 569 extern void nfs_clear_verifier_delegated(struct inode *inode); 570 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 571 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry, 572 struct nfs_fh *fh, struct nfs_fattr *fattr); 573 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, 574 struct nfs_fattr *fattr); 575 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags); 576 extern void nfs_access_zap_cache(struct inode *inode); 577 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, 578 u32 *mask, bool may_block); 579 extern int nfs_atomic_open_v23(struct inode *dir, struct dentry *dentry, 580 struct file *file, unsigned int open_flags, 581 umode_t mode); 582 583 /* 584 * linux/fs/nfs/symlink.c 585 */ 586 extern const struct inode_operations nfs_symlink_inode_operations; 587 588 /* 589 * linux/fs/nfs/sysctl.c 590 */ 591 #ifdef CONFIG_SYSCTL 592 extern int nfs_register_sysctl(void); 593 extern void nfs_unregister_sysctl(void); 594 #else 595 #define nfs_register_sysctl() 0 596 #define nfs_unregister_sysctl() do { } while(0) 597 #endif 598 599 /* 600 * linux/fs/nfs/namespace.c 601 */ 602 extern const struct inode_operations nfs_mountpoint_inode_operations; 603 extern const struct inode_operations nfs_referral_inode_operations; 604 extern int nfs_mountpoint_expiry_timeout; 605 extern void nfs_release_automount_timer(void); 606 607 /* 608 * linux/fs/nfs/unlink.c 609 */ 610 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); 611 612 /* 613 * linux/fs/nfs/write.c 614 */ 615 extern int nfs_congestion_kb; 616 extern int nfs_writepages(struct address_space *, struct writeback_control *); 617 extern int nfs_flush_incompatible(struct file *file, struct folio *folio); 618 extern int nfs_update_folio(struct file *file, struct folio *folio, 619 unsigned int offset, unsigned int count); 620 621 /* 622 * Try to write back everything synchronously (but check the 623 * return value!) 624 */ 625 extern int nfs_sync_inode(struct inode *inode); 626 extern int nfs_wb_all(struct inode *inode); 627 extern int nfs_wb_folio(struct inode *inode, struct folio *folio); 628 extern int nfs_wb_folio_reclaim(struct inode *inode, struct folio *folio); 629 int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio); 630 extern int nfs_commit_inode(struct inode *, int); 631 extern struct nfs_commit_data *nfs_commitdata_alloc(void); 632 extern void nfs_commit_free(struct nfs_commit_data *data); 633 void nfs_commit_begin(struct nfs_mds_commit_info *cinfo); 634 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo); 635 636 static inline bool nfs_have_writebacks(const struct inode *inode) 637 { 638 if (S_ISREG(inode->i_mode)) 639 return atomic_long_read(&NFS_I(inode)->nrequests) != 0; 640 return false; 641 } 642 643 /* 644 * linux/fs/nfs/read.c 645 */ 646 int nfs_read_folio(struct file *, struct folio *); 647 void nfs_readahead(struct readahead_control *); 648 649 /* 650 * inline functions 651 */ 652 653 static inline loff_t nfs_size_to_loff_t(__u64 size) 654 { 655 return min_t(u64, size, OFFSET_MAX); 656 } 657 658 static inline void nfs_ooo_clear(struct nfs_inode *nfsi) 659 { 660 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER; 661 kfree(nfsi->ooo); 662 nfsi->ooo = NULL; 663 } 664 665 static inline bool nfs_ooo_test(struct nfs_inode *nfsi) 666 { 667 return (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) || 668 (nfsi->ooo && nfsi->ooo->cnt > 0); 669 670 } 671 672 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) 673 674 /* We need to block new opens while a file is being unlinked. 675 * If it is opened *before* we decide to unlink, we will silly-rename 676 * instead. If it is opened *after*, then we need to create or will fail. 677 * If we allow the two to race, we could end up with a file that is open 678 * but deleted on the server resulting in ESTALE. 679 * So use ->d_fsdata to record when the unlink is happening 680 * and block dentry revalidation while it is set. 681 */ 682 #define NFS_FSDATA_BLOCKED ((void*)1) 683 684 # undef ifdebug 685 # ifdef NFS_DEBUG 686 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) 687 # define NFS_IFDEBUG(x) x 688 # else 689 # define ifdebug(fac) if (0) 690 # define NFS_IFDEBUG(x) 691 # endif 692 #endif 693