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