| 1 | /* |
| 2 | * linux/include/linux/nfs_fs.h |
| 3 | * |
| 4 | * Copyright (C) 1992 Rick Sladkey |
| 5 | * |
| 6 | * OS-specific nfs filesystem definitions and declarations |
| 7 | */ |
| 8 | |
| 9 | #ifndef _LINUX_NFS_FS_H |
| 10 | #define _LINUX_NFS_FS_H |
| 11 | |
| 12 | #include <linux/magic.h> |
| 13 | |
| 14 | /* Default timeout values */ |
| 15 | #define NFS_DEF_UDP_TIMEO (11) |
| 16 | #define NFS_DEF_UDP_RETRANS (3) |
| 17 | #define NFS_DEF_TCP_TIMEO (600) |
| 18 | #define NFS_DEF_TCP_RETRANS (2) |
| 19 | |
| 20 | #define NFS_MAX_UDP_TIMEOUT (60*HZ) |
| 21 | #define NFS_MAX_TCP_TIMEOUT (600*HZ) |
| 22 | |
| 23 | #define NFS_DEF_ACREGMIN (3) |
| 24 | #define NFS_DEF_ACREGMAX (60) |
| 25 | #define NFS_DEF_ACDIRMIN (30) |
| 26 | #define NFS_DEF_ACDIRMAX (60) |
| 27 | |
| 28 | /* |
| 29 | * When flushing a cluster of dirty pages, there can be different |
| 30 | * strategies: |
| 31 | */ |
| 32 | #define FLUSH_SYNC 1 /* file being synced, or contention */ |
| 33 | #define FLUSH_STABLE 4 /* commit to stable storage */ |
| 34 | #define FLUSH_LOWPRI 8 /* low priority background flush */ |
| 35 | #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */ |
| 36 | |
| 37 | #ifdef __KERNEL__ |
| 38 | |
| 39 | #include <linux/in.h> |
| 40 | #include <linux/mm.h> |
| 41 | #include <linux/pagemap.h> |
| 42 | #include <linux/rbtree.h> |
| 43 | #include <linux/rwsem.h> |
| 44 | #include <linux/wait.h> |
| 45 | |
| 46 | #include <linux/sunrpc/debug.h> |
| 47 | #include <linux/sunrpc/auth.h> |
| 48 | #include <linux/sunrpc/clnt.h> |
| 49 | |
| 50 | #include <linux/nfs.h> |
| 51 | #include <linux/nfs2.h> |
| 52 | #include <linux/nfs3.h> |
| 53 | #include <linux/nfs4.h> |
| 54 | #include <linux/nfs_xdr.h> |
| 55 | #include <linux/nfs_fs_sb.h> |
| 56 | |
| 57 | #include <linux/mempool.h> |
| 58 | |
| 59 | /* |
| 60 | * These are the default flags for swap requests |
| 61 | */ |
| 62 | #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) |
| 63 | |
| 64 | /* |
| 65 | * NFSv3/v4 Access mode cache entry |
| 66 | */ |
| 67 | struct nfs_access_entry { |
| 68 | struct rb_node rb_node; |
| 69 | struct list_head lru; |
| 70 | unsigned long jiffies; |
| 71 | struct rpc_cred * cred; |
| 72 | int mask; |
| 73 | }; |
| 74 | |
| 75 | struct nfs_lock_context { |
| 76 | atomic_t count; |
| 77 | struct list_head list; |
| 78 | struct nfs_open_context *open_context; |
| 79 | fl_owner_t lockowner; |
| 80 | pid_t pid; |
| 81 | }; |
| 82 | |
| 83 | struct nfs4_state; |
| 84 | struct nfs_open_context { |
| 85 | struct nfs_lock_context lock_context; |
| 86 | struct path path; |
| 87 | struct rpc_cred *cred; |
| 88 | struct nfs4_state *state; |
| 89 | fmode_t mode; |
| 90 | |
| 91 | unsigned long flags; |
| 92 | #define NFS_CONTEXT_ERROR_WRITE (0) |
| 93 | int error; |
| 94 | |
| 95 | struct list_head list; |
| 96 | |
| 97 | __u64 dir_cookie; |
| 98 | }; |
| 99 | |
| 100 | /* |
| 101 | * NFSv4 delegation |
| 102 | */ |
| 103 | struct nfs_delegation; |
| 104 | |
| 105 | struct posix_acl; |
| 106 | |
| 107 | /* |
| 108 | * nfs fs inode data in memory |
| 109 | */ |
| 110 | struct nfs_inode { |
| 111 | /* |
| 112 | * The 64bit 'inode number' |
| 113 | */ |
| 114 | __u64 fileid; |
| 115 | |
| 116 | /* |
| 117 | * NFS file handle |
| 118 | */ |
| 119 | struct nfs_fh fh; |
| 120 | |
| 121 | /* |
| 122 | * Various flags |
| 123 | */ |
| 124 | unsigned long flags; /* atomic bit ops */ |
| 125 | unsigned long cache_validity; /* bit mask */ |
| 126 | |
| 127 | /* |
| 128 | * read_cache_jiffies is when we started read-caching this inode. |
| 129 | * attrtimeo is for how long the cached information is assumed |
| 130 | * to be valid. A successful attribute revalidation doubles |
| 131 | * attrtimeo (up to acregmax/acdirmax), a failure resets it to |
| 132 | * acregmin/acdirmin. |
| 133 | * |
| 134 | * We need to revalidate the cached attrs for this inode if |
| 135 | * |
| 136 | * jiffies - read_cache_jiffies >= attrtimeo |
| 137 | * |
| 138 | * Please note the comparison is greater than or equal |
| 139 | * so that zero timeout values can be specified. |
| 140 | */ |
| 141 | unsigned long read_cache_jiffies; |
| 142 | unsigned long attrtimeo; |
| 143 | unsigned long attrtimeo_timestamp; |
| 144 | __u64 change_attr; /* v4 only */ |
| 145 | |
| 146 | unsigned long attr_gencount; |
| 147 | /* "Generation counter" for the attribute cache. This is |
| 148 | * bumped whenever we update the metadata on the |
| 149 | * server. |
| 150 | */ |
| 151 | unsigned long cache_change_attribute; |
| 152 | |
| 153 | struct rb_root access_cache; |
| 154 | struct list_head access_cache_entry_lru; |
| 155 | struct list_head access_cache_inode_lru; |
| 156 | #ifdef CONFIG_NFS_V3_ACL |
| 157 | struct posix_acl *acl_access; |
| 158 | struct posix_acl *acl_default; |
| 159 | #endif |
| 160 | |
| 161 | /* |
| 162 | * This is the cookie verifier used for NFSv3 readdir |
| 163 | * operations |
| 164 | */ |
| 165 | __be32 cookieverf[2]; |
| 166 | |
| 167 | /* |
| 168 | * This is the list of dirty unwritten pages. |
| 169 | */ |
| 170 | struct radix_tree_root nfs_page_tree; |
| 171 | |
| 172 | unsigned long npages; |
| 173 | unsigned long ncommit; |
| 174 | |
| 175 | /* Open contexts for shared mmap writes */ |
| 176 | struct list_head open_files; |
| 177 | |
| 178 | /* Number of in-flight sillydelete RPC calls */ |
| 179 | atomic_t silly_count; |
| 180 | /* List of deferred sillydelete requests */ |
| 181 | struct hlist_head silly_list; |
| 182 | wait_queue_head_t waitqueue; |
| 183 | |
| 184 | #ifdef CONFIG_NFS_V4 |
| 185 | struct nfs4_cached_acl *nfs4_acl; |
| 186 | /* NFSv4 state */ |
| 187 | struct list_head open_states; |
| 188 | struct nfs_delegation __rcu *delegation; |
| 189 | fmode_t delegation_state; |
| 190 | struct rw_semaphore rwsem; |
| 191 | |
| 192 | /* pNFS layout information */ |
| 193 | struct pnfs_layout_hdr *layout; |
| 194 | #endif /* CONFIG_NFS_V4*/ |
| 195 | #ifdef CONFIG_NFS_FSCACHE |
| 196 | struct fscache_cookie *fscache; |
| 197 | #endif |
| 198 | struct inode vfs_inode; |
| 199 | }; |
| 200 | |
| 201 | /* |
| 202 | * Cache validity bit flags |
| 203 | */ |
| 204 | #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */ |
| 205 | #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */ |
| 206 | #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */ |
| 207 | #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */ |
| 208 | #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */ |
| 209 | #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */ |
| 210 | #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */ |
| 211 | |
| 212 | /* |
| 213 | * Bit offsets in flags field |
| 214 | */ |
| 215 | #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */ |
| 216 | #define NFS_INO_STALE (1) /* possible stale inode */ |
| 217 | #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ |
| 218 | #define NFS_INO_MOUNTPOINT (3) /* inode is remote mountpoint */ |
| 219 | #define NFS_INO_FLUSHING (4) /* inode is flushing out data */ |
| 220 | #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */ |
| 221 | #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */ |
| 222 | #define NFS_INO_COMMIT (7) /* inode is committing unstable writes */ |
| 223 | |
| 224 | static inline struct nfs_inode *NFS_I(const struct inode *inode) |
| 225 | { |
| 226 | return container_of(inode, struct nfs_inode, vfs_inode); |
| 227 | } |
| 228 | |
| 229 | static inline struct nfs_server *NFS_SB(const struct super_block *s) |
| 230 | { |
| 231 | return (struct nfs_server *)(s->s_fs_info); |
| 232 | } |
| 233 | |
| 234 | static inline struct nfs_fh *NFS_FH(const struct inode *inode) |
| 235 | { |
| 236 | return &NFS_I(inode)->fh; |
| 237 | } |
| 238 | |
| 239 | static inline struct nfs_server *NFS_SERVER(const struct inode *inode) |
| 240 | { |
| 241 | return NFS_SB(inode->i_sb); |
| 242 | } |
| 243 | |
| 244 | static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) |
| 245 | { |
| 246 | return NFS_SERVER(inode)->client; |
| 247 | } |
| 248 | |
| 249 | static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) |
| 250 | { |
| 251 | return NFS_SERVER(inode)->nfs_client->rpc_ops; |
| 252 | } |
| 253 | |
| 254 | static inline __be32 *NFS_COOKIEVERF(const struct inode *inode) |
| 255 | { |
| 256 | return NFS_I(inode)->cookieverf; |
| 257 | } |
| 258 | |
| 259 | static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) |
| 260 | { |
| 261 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 262 | return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; |
| 263 | } |
| 264 | |
| 265 | static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) |
| 266 | { |
| 267 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 268 | return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; |
| 269 | } |
| 270 | |
| 271 | static inline int NFS_STALE(const struct inode *inode) |
| 272 | { |
| 273 | return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| 274 | } |
| 275 | |
| 276 | static inline int NFS_FSCACHE(const struct inode *inode) |
| 277 | { |
| 278 | return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags); |
| 279 | } |
| 280 | |
| 281 | static inline __u64 NFS_FILEID(const struct inode *inode) |
| 282 | { |
| 283 | return NFS_I(inode)->fileid; |
| 284 | } |
| 285 | |
| 286 | static inline void set_nfs_fileid(struct inode *inode, __u64 fileid) |
| 287 | { |
| 288 | NFS_I(inode)->fileid = fileid; |
| 289 | } |
| 290 | |
| 291 | static inline void nfs_mark_for_revalidate(struct inode *inode) |
| 292 | { |
| 293 | struct nfs_inode *nfsi = NFS_I(inode); |
| 294 | |
| 295 | spin_lock(&inode->i_lock); |
| 296 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; |
| 297 | if (S_ISDIR(inode->i_mode)) |
| 298 | nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA; |
| 299 | spin_unlock(&inode->i_lock); |
| 300 | } |
| 301 | |
| 302 | static inline int nfs_server_capable(struct inode *inode, int cap) |
| 303 | { |
| 304 | return NFS_SERVER(inode)->caps & cap; |
| 305 | } |
| 306 | |
| 307 | static inline int NFS_USE_READDIRPLUS(struct inode *inode) |
| 308 | { |
| 309 | return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
| 310 | } |
| 311 | |
| 312 | static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) |
| 313 | { |
| 314 | dentry->d_time = verf; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * nfs_save_change_attribute - Returns the inode attribute change cookie |
| 319 | * @dir - pointer to parent directory inode |
| 320 | * The "change attribute" is updated every time we finish an operation |
| 321 | * that will result in a metadata change on the server. |
| 322 | */ |
| 323 | static inline unsigned long nfs_save_change_attribute(struct inode *dir) |
| 324 | { |
| 325 | return NFS_I(dir)->cache_change_attribute; |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * nfs_verify_change_attribute - Detects NFS remote directory changes |
| 330 | * @dir - pointer to parent directory inode |
| 331 | * @chattr - previously saved change attribute |
| 332 | * Return "false" if the verifiers doesn't match the change attribute. |
| 333 | * This would usually indicate that the directory contents have changed on |
| 334 | * the server, and that any dentries need revalidating. |
| 335 | */ |
| 336 | static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr) |
| 337 | { |
| 338 | return chattr == NFS_I(dir)->cache_change_attribute; |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * linux/fs/nfs/inode.c |
| 343 | */ |
| 344 | extern int nfs_sync_mapping(struct address_space *mapping); |
| 345 | extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); |
| 346 | extern void nfs_zap_caches(struct inode *); |
| 347 | extern void nfs_invalidate_atime(struct inode *); |
| 348 | extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, |
| 349 | struct nfs_fattr *); |
| 350 | extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); |
| 351 | extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); |
| 352 | extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); |
| 353 | extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| 354 | extern int nfs_permission(struct inode *, int); |
| 355 | extern int nfs_open(struct inode *, struct file *); |
| 356 | extern int nfs_release(struct inode *, struct file *); |
| 357 | extern int nfs_attribute_timeout(struct inode *inode); |
| 358 | extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode); |
| 359 | extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); |
| 360 | extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); |
| 361 | extern int nfs_setattr(struct dentry *, struct iattr *); |
| 362 | extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr); |
| 363 | extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); |
| 364 | extern void put_nfs_open_context(struct nfs_open_context *ctx); |
| 365 | extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode); |
| 366 | extern struct nfs_open_context *alloc_nfs_open_context(struct path *path, struct rpc_cred *cred, fmode_t f_mode); |
| 367 | extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx); |
| 368 | extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); |
| 369 | extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); |
| 370 | extern u64 nfs_compat_user_ino64(u64 fileid); |
| 371 | extern void nfs_fattr_init(struct nfs_fattr *fattr); |
| 372 | extern unsigned long nfs_inc_attr_generation_counter(void); |
| 373 | |
| 374 | extern struct nfs_fattr *nfs_alloc_fattr(void); |
| 375 | |
| 376 | static inline void nfs_free_fattr(const struct nfs_fattr *fattr) |
| 377 | { |
| 378 | kfree(fattr); |
| 379 | } |
| 380 | |
| 381 | extern struct nfs_fh *nfs_alloc_fhandle(void); |
| 382 | |
| 383 | static inline void nfs_free_fhandle(const struct nfs_fh *fh) |
| 384 | { |
| 385 | kfree(fh); |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * linux/fs/nfs/nfsroot.c |
| 390 | */ |
| 391 | extern int nfs_root_data(char **root_device, char **root_data); /*__init*/ |
| 392 | /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ |
| 393 | extern __be32 root_nfs_parse_addr(char *name); /*__init*/ |
| 394 | |
| 395 | /* |
| 396 | * linux/fs/nfs/file.c |
| 397 | */ |
| 398 | extern const struct inode_operations nfs_file_inode_operations; |
| 399 | #ifdef CONFIG_NFS_V3 |
| 400 | extern const struct inode_operations nfs3_file_inode_operations; |
| 401 | #endif /* CONFIG_NFS_V3 */ |
| 402 | extern const struct file_operations nfs_file_operations; |
| 403 | extern const struct address_space_operations nfs_file_aops; |
| 404 | |
| 405 | static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) |
| 406 | { |
| 407 | return filp->private_data; |
| 408 | } |
| 409 | |
| 410 | static inline struct rpc_cred *nfs_file_cred(struct file *file) |
| 411 | { |
| 412 | if (file != NULL) { |
| 413 | struct nfs_open_context *ctx = |
| 414 | nfs_file_open_context(file); |
| 415 | if (ctx) |
| 416 | return ctx->cred; |
| 417 | } |
| 418 | return NULL; |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * linux/fs/nfs/xattr.c |
| 423 | */ |
| 424 | #ifdef CONFIG_NFS_V3_ACL |
| 425 | extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t); |
| 426 | extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t); |
| 427 | extern int nfs3_setxattr(struct dentry *, const char *, |
| 428 | const void *, size_t, int); |
| 429 | extern int nfs3_removexattr (struct dentry *, const char *name); |
| 430 | #else |
| 431 | # define nfs3_listxattr NULL |
| 432 | # define nfs3_getxattr NULL |
| 433 | # define nfs3_setxattr NULL |
| 434 | # define nfs3_removexattr NULL |
| 435 | #endif |
| 436 | |
| 437 | /* |
| 438 | * linux/fs/nfs/direct.c |
| 439 | */ |
| 440 | extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t, |
| 441 | unsigned long); |
| 442 | extern ssize_t nfs_file_direct_read(struct kiocb *iocb, |
| 443 | const struct iovec *iov, unsigned long nr_segs, |
| 444 | loff_t pos); |
| 445 | extern ssize_t nfs_file_direct_write(struct kiocb *iocb, |
| 446 | const struct iovec *iov, unsigned long nr_segs, |
| 447 | loff_t pos); |
| 448 | |
| 449 | /* |
| 450 | * linux/fs/nfs/dir.c |
| 451 | */ |
| 452 | extern const struct inode_operations nfs_dir_inode_operations; |
| 453 | #ifdef CONFIG_NFS_V3 |
| 454 | extern const struct inode_operations nfs3_dir_inode_operations; |
| 455 | #endif /* CONFIG_NFS_V3 */ |
| 456 | extern const struct file_operations nfs_dir_operations; |
| 457 | extern const struct dentry_operations nfs_dentry_operations; |
| 458 | |
| 459 | extern void nfs_force_lookup_revalidate(struct inode *dir); |
| 460 | extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr); |
| 461 | extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags); |
| 462 | extern void nfs_access_zap_cache(struct inode *inode); |
| 463 | |
| 464 | /* |
| 465 | * linux/fs/nfs/symlink.c |
| 466 | */ |
| 467 | extern const struct inode_operations nfs_symlink_inode_operations; |
| 468 | |
| 469 | /* |
| 470 | * linux/fs/nfs/sysctl.c |
| 471 | */ |
| 472 | #ifdef CONFIG_SYSCTL |
| 473 | extern int nfs_register_sysctl(void); |
| 474 | extern void nfs_unregister_sysctl(void); |
| 475 | #else |
| 476 | #define nfs_register_sysctl() 0 |
| 477 | #define nfs_unregister_sysctl() do { } while(0) |
| 478 | #endif |
| 479 | |
| 480 | /* |
| 481 | * linux/fs/nfs/namespace.c |
| 482 | */ |
| 483 | extern const struct inode_operations nfs_mountpoint_inode_operations; |
| 484 | extern const struct inode_operations nfs_referral_inode_operations; |
| 485 | extern int nfs_mountpoint_expiry_timeout; |
| 486 | extern void nfs_release_automount_timer(void); |
| 487 | |
| 488 | /* |
| 489 | * linux/fs/nfs/unlink.c |
| 490 | */ |
| 491 | extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); |
| 492 | extern void nfs_block_sillyrename(struct dentry *dentry); |
| 493 | extern void nfs_unblock_sillyrename(struct dentry *dentry); |
| 494 | extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); |
| 495 | |
| 496 | /* |
| 497 | * linux/fs/nfs/write.c |
| 498 | */ |
| 499 | extern int nfs_congestion_kb; |
| 500 | extern int nfs_writepage(struct page *page, struct writeback_control *wbc); |
| 501 | extern int nfs_writepages(struct address_space *, struct writeback_control *); |
| 502 | extern int nfs_flush_incompatible(struct file *file, struct page *page); |
| 503 | extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); |
| 504 | extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *); |
| 505 | |
| 506 | /* |
| 507 | * Try to write back everything synchronously (but check the |
| 508 | * return value!) |
| 509 | */ |
| 510 | extern int nfs_wb_all(struct inode *inode); |
| 511 | extern int nfs_wb_page(struct inode *inode, struct page* page); |
| 512 | extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); |
| 513 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
| 514 | extern int nfs_commit_inode(struct inode *, int); |
| 515 | extern struct nfs_write_data *nfs_commitdata_alloc(void); |
| 516 | extern void nfs_commit_free(struct nfs_write_data *wdata); |
| 517 | #else |
| 518 | static inline int |
| 519 | nfs_commit_inode(struct inode *inode, int how) |
| 520 | { |
| 521 | return 0; |
| 522 | } |
| 523 | #endif |
| 524 | |
| 525 | static inline int |
| 526 | nfs_have_writebacks(struct inode *inode) |
| 527 | { |
| 528 | return NFS_I(inode)->npages != 0; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Allocate nfs_write_data structures |
| 533 | */ |
| 534 | extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages); |
| 535 | extern void nfs_writedata_free(struct nfs_write_data *); |
| 536 | |
| 537 | /* |
| 538 | * linux/fs/nfs/read.c |
| 539 | */ |
| 540 | extern int nfs_readpage(struct file *, struct page *); |
| 541 | extern int nfs_readpages(struct file *, struct address_space *, |
| 542 | struct list_head *, unsigned); |
| 543 | extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *); |
| 544 | extern int nfs_readpage_async(struct nfs_open_context *, struct inode *, |
| 545 | struct page *); |
| 546 | |
| 547 | /* |
| 548 | * Allocate nfs_read_data structures |
| 549 | */ |
| 550 | extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages); |
| 551 | extern void nfs_readdata_free(struct nfs_read_data *); |
| 552 | |
| 553 | /* |
| 554 | * linux/fs/nfs3proc.c |
| 555 | */ |
| 556 | #ifdef CONFIG_NFS_V3_ACL |
| 557 | extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type); |
| 558 | extern int nfs3_proc_setacl(struct inode *inode, int type, |
| 559 | struct posix_acl *acl); |
| 560 | extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode, |
| 561 | mode_t mode); |
| 562 | extern void nfs3_forget_cached_acls(struct inode *inode); |
| 563 | #else |
| 564 | static inline int nfs3_proc_set_default_acl(struct inode *dir, |
| 565 | struct inode *inode, |
| 566 | mode_t mode) |
| 567 | { |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static inline void nfs3_forget_cached_acls(struct inode *inode) |
| 572 | { |
| 573 | } |
| 574 | #endif /* CONFIG_NFS_V3_ACL */ |
| 575 | |
| 576 | /* |
| 577 | * inline functions |
| 578 | */ |
| 579 | |
| 580 | static inline loff_t nfs_size_to_loff_t(__u64 size) |
| 581 | { |
| 582 | if (size > (__u64) OFFSET_MAX - 1) |
| 583 | return OFFSET_MAX - 1; |
| 584 | return (loff_t) size; |
| 585 | } |
| 586 | |
| 587 | static inline ino_t |
| 588 | nfs_fileid_to_ino_t(u64 fileid) |
| 589 | { |
| 590 | ino_t ino = (ino_t) fileid; |
| 591 | if (sizeof(ino_t) < sizeof(u64)) |
| 592 | ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; |
| 593 | return ino; |
| 594 | } |
| 595 | |
| 596 | #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) |
| 597 | |
| 598 | #endif /* __KERNEL__ */ |
| 599 | |
| 600 | /* |
| 601 | * NFS debug flags |
| 602 | */ |
| 603 | #define NFSDBG_VFS 0x0001 |
| 604 | #define NFSDBG_DIRCACHE 0x0002 |
| 605 | #define NFSDBG_LOOKUPCACHE 0x0004 |
| 606 | #define NFSDBG_PAGECACHE 0x0008 |
| 607 | #define NFSDBG_PROC 0x0010 |
| 608 | #define NFSDBG_XDR 0x0020 |
| 609 | #define NFSDBG_FILE 0x0040 |
| 610 | #define NFSDBG_ROOT 0x0080 |
| 611 | #define NFSDBG_CALLBACK 0x0100 |
| 612 | #define NFSDBG_CLIENT 0x0200 |
| 613 | #define NFSDBG_MOUNT 0x0400 |
| 614 | #define NFSDBG_FSCACHE 0x0800 |
| 615 | #define NFSDBG_PNFS 0x1000 |
| 616 | #define NFSDBG_PNFS_LD 0x2000 |
| 617 | #define NFSDBG_ALL 0xFFFF |
| 618 | |
| 619 | #ifdef __KERNEL__ |
| 620 | |
| 621 | /* |
| 622 | * Enable debugging support for nfs client. |
| 623 | * Requires RPC_DEBUG. |
| 624 | */ |
| 625 | #ifdef RPC_DEBUG |
| 626 | # define NFS_DEBUG |
| 627 | #endif |
| 628 | |
| 629 | # undef ifdebug |
| 630 | # ifdef NFS_DEBUG |
| 631 | # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) |
| 632 | # else |
| 633 | # define ifdebug(fac) if (0) |
| 634 | # endif |
| 635 | #endif /* __KERNEL */ |
| 636 | |
| 637 | #endif |