1 /* 2 * NFS internal definitions 3 */ 4 5 #include "nfs4_fs.h" 6 #include <linux/mount.h> 7 #include <linux/security.h> 8 #include <linux/crc32.h> 9 10 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 11 12 struct nfs_string; 13 14 /* Maximum number of readahead requests 15 * FIXME: this should really be a sysctl so that users may tune it to suit 16 * their needs. People that do NFS over a slow network, might for 17 * instance want to reduce it to something closer to 1 for improved 18 * interactive response. 19 */ 20 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 21 22 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 23 { 24 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 25 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 26 } 27 28 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 29 { 30 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 31 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 32 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 33 return 0; 34 return 1; 35 } 36 37 struct nfs_clone_mount { 38 const struct super_block *sb; 39 const struct dentry *dentry; 40 struct nfs_fh *fh; 41 struct nfs_fattr *fattr; 42 char *hostname; 43 char *mnt_path; 44 struct sockaddr *addr; 45 size_t addrlen; 46 rpc_authflavor_t authflavor; 47 }; 48 49 /* 50 * Note: RFC 1813 doesn't limit the number of auth flavors that 51 * a server can return, so make something up. 52 */ 53 #define NFS_MAX_SECFLAVORS (12) 54 55 /* 56 * Value used if the user did not specify a port value. 57 */ 58 #define NFS_UNSPEC_PORT (-1) 59 60 /* 61 * Maximum number of pages that readdir can use for creating 62 * a vmapped array of pages. 63 */ 64 #define NFS_MAX_READDIR_PAGES 8 65 66 struct nfs_client_initdata { 67 unsigned long init_flags; 68 const char *hostname; 69 const struct sockaddr *addr; 70 size_t addrlen; 71 struct nfs_subversion *nfs_mod; 72 int proto; 73 u32 minorversion; 74 struct net *net; 75 }; 76 77 /* 78 * In-kernel mount arguments 79 */ 80 struct nfs_parsed_mount_data { 81 int flags; 82 unsigned int rsize, wsize; 83 unsigned int timeo, retrans; 84 unsigned int acregmin, acregmax, 85 acdirmin, acdirmax; 86 unsigned int namlen; 87 unsigned int options; 88 unsigned int bsize; 89 struct nfs_auth_info auth_info; 90 rpc_authflavor_t selected_flavor; 91 char *client_address; 92 unsigned int version; 93 unsigned int minorversion; 94 char *fscache_uniq; 95 bool need_mount; 96 97 struct { 98 struct sockaddr_storage address; 99 size_t addrlen; 100 char *hostname; 101 u32 version; 102 int port; 103 unsigned short protocol; 104 } mount_server; 105 106 struct { 107 struct sockaddr_storage address; 108 size_t addrlen; 109 char *hostname; 110 char *export_path; 111 int port; 112 unsigned short protocol; 113 } nfs_server; 114 115 struct security_mnt_opts lsm_opts; 116 struct net *net; 117 }; 118 119 /* mount_clnt.c */ 120 struct nfs_mount_request { 121 struct sockaddr *sap; 122 size_t salen; 123 char *hostname; 124 char *dirpath; 125 u32 version; 126 unsigned short protocol; 127 struct nfs_fh *fh; 128 int noresvport; 129 unsigned int *auth_flav_len; 130 rpc_authflavor_t *auth_flavs; 131 struct net *net; 132 }; 133 134 struct nfs_mount_info { 135 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 136 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 137 struct nfs_parsed_mount_data *parsed; 138 struct nfs_clone_mount *cloned; 139 struct nfs_fh *mntfh; 140 }; 141 142 extern int nfs_mount(struct nfs_mount_request *info); 143 extern void nfs_umount(const struct nfs_mount_request *info); 144 145 /* client.c */ 146 extern const struct rpc_program nfs_program; 147 extern void nfs_clients_init(struct net *net); 148 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 149 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t); 150 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *, 151 const struct rpc_timeout *, const char *, 152 rpc_authflavor_t); 153 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 154 void nfs_server_insert_lists(struct nfs_server *); 155 void nfs_server_remove_lists(struct nfs_server *); 156 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int); 157 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 158 rpc_authflavor_t); 159 struct nfs_server *nfs_alloc_server(void); 160 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 161 162 extern void nfs_cleanup_cb_ident_idr(struct net *); 163 extern void nfs_put_client(struct nfs_client *); 164 extern void nfs_free_client(struct nfs_client *); 165 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 166 extern struct nfs_client * 167 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 168 struct nfs4_sessionid *, u32); 169 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 170 struct nfs_subversion *); 171 extern struct nfs_server *nfs4_create_server( 172 struct nfs_mount_info *, 173 struct nfs_subversion *); 174 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 175 struct nfs_fh *); 176 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 177 struct sockaddr *sap, size_t salen, 178 struct net *net); 179 extern void nfs_free_server(struct nfs_server *server); 180 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 181 struct nfs_fh *, 182 struct nfs_fattr *, 183 rpc_authflavor_t); 184 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 185 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 186 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 187 const struct sockaddr *ds_addr, 188 int ds_addrlen, int ds_proto, 189 unsigned int ds_timeo, 190 unsigned int ds_retrans); 191 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 192 struct inode *); 193 #ifdef CONFIG_PROC_FS 194 extern int __init nfs_fs_proc_init(void); 195 extern void nfs_fs_proc_exit(void); 196 extern int nfs_fs_proc_net_init(struct net *net); 197 extern void nfs_fs_proc_net_exit(struct net *net); 198 #else 199 static inline int nfs_fs_proc_net_init(struct net *net) 200 { 201 return 0; 202 } 203 static inline void nfs_fs_proc_net_exit(struct net *net) 204 { 205 } 206 static inline int nfs_fs_proc_init(void) 207 { 208 return 0; 209 } 210 static inline void nfs_fs_proc_exit(void) 211 { 212 } 213 #endif 214 215 #ifdef CONFIG_NFS_V4_1 216 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 217 #endif 218 219 /* callback_xdr.c */ 220 extern struct svc_version nfs4_callback_version1; 221 extern struct svc_version nfs4_callback_version4; 222 223 struct nfs_pageio_descriptor; 224 /* pagelist.c */ 225 extern int __init nfs_init_nfspagecache(void); 226 extern void nfs_destroy_nfspagecache(void); 227 extern int __init nfs_init_readpagecache(void); 228 extern void nfs_destroy_readpagecache(void); 229 extern int __init nfs_init_writepagecache(void); 230 extern void nfs_destroy_writepagecache(void); 231 232 extern int __init nfs_init_directcache(void); 233 extern void nfs_destroy_directcache(void); 234 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 235 struct nfs_pgio_header *hdr, 236 void (*release)(struct nfs_pgio_header *hdr)); 237 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 238 int nfs_iocounter_wait(struct nfs_io_counter *c); 239 240 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 241 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 242 void nfs_pgio_header_free(struct nfs_pgio_header *); 243 void nfs_pgio_data_destroy(struct nfs_pgio_header *); 244 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 245 int nfs_initiate_pgio(struct rpc_clnt *, struct nfs_pgio_header *, 246 const struct rpc_call_ops *, int, int); 247 void nfs_free_request(struct nfs_page *req); 248 249 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 250 { 251 c->flags = 0; 252 atomic_set(&c->io_count, 0); 253 } 254 255 /* nfs2xdr.c */ 256 extern struct rpc_procinfo nfs_procedures[]; 257 extern int nfs2_decode_dirent(struct xdr_stream *, 258 struct nfs_entry *, int); 259 260 /* nfs3xdr.c */ 261 extern struct rpc_procinfo nfs3_procedures[]; 262 extern int nfs3_decode_dirent(struct xdr_stream *, 263 struct nfs_entry *, int); 264 265 /* nfs4xdr.c */ 266 #if IS_ENABLED(CONFIG_NFS_V4) 267 extern int nfs4_decode_dirent(struct xdr_stream *, 268 struct nfs_entry *, int); 269 #endif 270 #ifdef CONFIG_NFS_V4_1 271 extern const u32 nfs41_maxread_overhead; 272 extern const u32 nfs41_maxwrite_overhead; 273 extern const u32 nfs41_maxgetdevinfo_overhead; 274 #endif 275 276 /* nfs4proc.c */ 277 #if IS_ENABLED(CONFIG_NFS_V4) 278 extern struct rpc_procinfo nfs4_procedures[]; 279 #endif 280 281 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 282 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 283 static inline void nfs4_label_free(struct nfs4_label *label) 284 { 285 if (label) { 286 kfree(label->label); 287 kfree(label); 288 } 289 return; 290 } 291 292 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 293 { 294 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 295 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 296 } 297 #else 298 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 299 static inline void nfs4_label_free(void *label) {} 300 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 301 { 302 } 303 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 304 305 /* proc.c */ 306 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 307 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 308 const struct rpc_timeout *timeparms, 309 const char *ip_addr); 310 311 /* dir.c */ 312 extern void nfs_force_use_readdirplus(struct inode *dir); 313 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 314 struct shrink_control *sc); 315 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 316 struct shrink_control *sc); 317 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 318 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 319 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 320 int nfs_rmdir(struct inode *, struct dentry *); 321 int nfs_unlink(struct inode *, struct dentry *); 322 int nfs_symlink(struct inode *, struct dentry *, const char *); 323 int nfs_link(struct dentry *, struct inode *, struct dentry *); 324 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 325 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 326 327 /* file.c */ 328 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 329 loff_t nfs_file_llseek(struct file *, loff_t, int); 330 int nfs_file_flush(struct file *, fl_owner_t); 331 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 332 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 333 size_t, unsigned int); 334 int nfs_file_mmap(struct file *, struct vm_area_struct *); 335 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 336 int nfs_file_release(struct inode *, struct file *); 337 int nfs_lock(struct file *, int, struct file_lock *); 338 int nfs_flock(struct file *, int, struct file_lock *); 339 int nfs_check_flags(int); 340 341 /* inode.c */ 342 extern struct workqueue_struct *nfsiod_workqueue; 343 extern struct inode *nfs_alloc_inode(struct super_block *sb); 344 extern void nfs_destroy_inode(struct inode *); 345 extern int nfs_write_inode(struct inode *, struct writeback_control *); 346 extern int nfs_drop_inode(struct inode *); 347 extern void nfs_clear_inode(struct inode *); 348 extern void nfs_evict_inode(struct inode *); 349 void nfs_zap_acl_cache(struct inode *inode); 350 extern int nfs_wait_bit_killable(struct wait_bit_key *key); 351 352 /* super.c */ 353 extern const struct super_operations nfs_sops; 354 extern struct file_system_type nfs_fs_type; 355 extern struct file_system_type nfs_xdev_fs_type; 356 #if IS_ENABLED(CONFIG_NFS_V4) 357 extern struct file_system_type nfs4_xdev_fs_type; 358 extern struct file_system_type nfs4_referral_fs_type; 359 #endif 360 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 361 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 362 struct nfs_subversion *); 363 void nfs_initialise_sb(struct super_block *); 364 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 365 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 366 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 367 struct nfs_mount_info *, struct nfs_subversion *); 368 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 369 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 370 const char *, struct nfs_mount_info *); 371 void nfs_kill_super(struct super_block *); 372 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 373 374 extern struct rpc_stat nfs_rpcstat; 375 376 extern int __init register_nfs_fs(void); 377 extern void __exit unregister_nfs_fs(void); 378 extern void nfs_sb_active(struct super_block *sb); 379 extern void nfs_sb_deactive(struct super_block *sb); 380 381 /* namespace.c */ 382 #define NFS_PATH_CANONICAL 1 383 extern char *nfs_path(char **p, struct dentry *dentry, 384 char *buffer, ssize_t buflen, unsigned flags); 385 extern struct vfsmount *nfs_d_automount(struct path *path); 386 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 387 struct nfs_fh *, struct nfs_fattr *); 388 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 389 struct nfs_fattr *, rpc_authflavor_t); 390 391 /* getroot.c */ 392 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 393 const char *); 394 #if IS_ENABLED(CONFIG_NFS_V4) 395 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 396 const char *); 397 398 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 399 #endif 400 401 struct nfs_pgio_completion_ops; 402 /* read.c */ 403 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 404 struct inode *inode, bool force_mds, 405 const struct nfs_pgio_completion_ops *compl_ops); 406 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 407 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 408 409 /* super.c */ 410 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 411 void nfs_umount_begin(struct super_block *); 412 int nfs_statfs(struct dentry *, struct kstatfs *); 413 int nfs_show_options(struct seq_file *, struct dentry *); 414 int nfs_show_devname(struct seq_file *, struct dentry *); 415 int nfs_show_path(struct seq_file *, struct dentry *); 416 int nfs_show_stats(struct seq_file *, struct dentry *); 417 void nfs_put_super(struct super_block *); 418 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 419 420 /* write.c */ 421 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 422 struct inode *inode, int ioflags, bool force_mds, 423 const struct nfs_pgio_completion_ops *compl_ops); 424 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 425 extern void nfs_commit_free(struct nfs_commit_data *p); 426 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 427 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 428 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 429 struct nfs_commit_data *data, 430 const struct rpc_call_ops *call_ops, 431 int how, int flags); 432 extern void nfs_init_commit(struct nfs_commit_data *data, 433 struct list_head *head, 434 struct pnfs_layout_segment *lseg, 435 struct nfs_commit_info *cinfo); 436 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 437 struct nfs_commit_info *cinfo, int max); 438 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 439 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 440 struct nfs_commit_info *cinfo); 441 void nfs_mark_request_commit(struct nfs_page *req, 442 struct pnfs_layout_segment *lseg, 443 struct nfs_commit_info *cinfo); 444 int nfs_write_need_commit(struct nfs_pgio_header *); 445 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 446 int how, struct nfs_commit_info *cinfo); 447 void nfs_retry_commit(struct list_head *page_list, 448 struct pnfs_layout_segment *lseg, 449 struct nfs_commit_info *cinfo); 450 void nfs_commitdata_release(struct nfs_commit_data *data); 451 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 452 struct nfs_commit_info *cinfo); 453 void nfs_request_remove_commit_list(struct nfs_page *req, 454 struct nfs_commit_info *cinfo); 455 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 456 struct inode *inode, 457 struct nfs_direct_req *dreq); 458 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 459 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 460 461 #ifdef CONFIG_MIGRATION 462 extern int nfs_migrate_page(struct address_space *, 463 struct page *, struct page *, enum migrate_mode); 464 #else 465 #define nfs_migrate_page NULL 466 #endif 467 468 /* unlink.c */ 469 extern struct rpc_task * 470 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 471 struct dentry *old_dentry, struct dentry *new_dentry, 472 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 473 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 474 475 /* direct.c */ 476 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 477 struct nfs_direct_req *dreq); 478 static inline void nfs_inode_dio_wait(struct inode *inode) 479 { 480 inode_dio_wait(inode); 481 } 482 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 483 484 /* nfs4proc.c */ 485 extern void __nfs4_read_done_cb(struct nfs_pgio_header *); 486 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 487 const struct rpc_timeout *timeparms, 488 const char *ip_addr); 489 extern int nfs40_walk_client_list(struct nfs_client *clp, 490 struct nfs_client **result, 491 struct rpc_cred *cred); 492 extern int nfs41_walk_client_list(struct nfs_client *clp, 493 struct nfs_client **result, 494 struct rpc_cred *cred); 495 496 /* 497 * Determine the device name as a string 498 */ 499 static inline char *nfs_devname(struct dentry *dentry, 500 char *buffer, ssize_t buflen) 501 { 502 char *dummy; 503 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 504 } 505 506 /* 507 * Determine the actual block size (and log2 thereof) 508 */ 509 static inline 510 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 511 { 512 /* make sure blocksize is a power of two */ 513 if ((bsize & (bsize - 1)) || nrbitsp) { 514 unsigned char nrbits; 515 516 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 517 ; 518 bsize = 1 << nrbits; 519 if (nrbitsp) 520 *nrbitsp = nrbits; 521 } 522 523 return bsize; 524 } 525 526 /* 527 * Calculate the number of 512byte blocks used. 528 */ 529 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 530 { 531 blkcnt_t used = (tsize + 511) >> 9; 532 return (used > ULONG_MAX) ? ULONG_MAX : used; 533 } 534 535 /* 536 * Compute and set NFS server blocksize 537 */ 538 static inline 539 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 540 { 541 if (bsize < NFS_MIN_FILE_IO_SIZE) 542 bsize = NFS_DEF_FILE_IO_SIZE; 543 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 544 bsize = NFS_MAX_FILE_IO_SIZE; 545 546 return nfs_block_bits(bsize, nrbitsp); 547 } 548 549 /* 550 * Determine the maximum file size for a superblock 551 */ 552 static inline 553 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 554 { 555 sb->s_maxbytes = (loff_t)maxfilesize; 556 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 557 sb->s_maxbytes = MAX_LFS_FILESIZE; 558 } 559 560 /* 561 * Determine the number of bytes of data the page contains 562 */ 563 static inline 564 unsigned int nfs_page_length(struct page *page) 565 { 566 loff_t i_size = i_size_read(page_file_mapping(page)->host); 567 568 if (i_size > 0) { 569 pgoff_t page_index = page_file_index(page); 570 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 571 if (page_index < end_index) 572 return PAGE_CACHE_SIZE; 573 if (page_index == end_index) 574 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 575 } 576 return 0; 577 } 578 579 /* 580 * Convert a umode to a dirent->d_type 581 */ 582 static inline 583 unsigned char nfs_umode_to_dtype(umode_t mode) 584 { 585 return (mode >> 12) & 15; 586 } 587 588 /* 589 * Determine the number of pages in an array of length 'len' and 590 * with a base offset of 'base' 591 */ 592 static inline 593 unsigned int nfs_page_array_len(unsigned int base, size_t len) 594 { 595 return ((unsigned long)len + (unsigned long)base + 596 PAGE_SIZE - 1) >> PAGE_SHIFT; 597 } 598 599 /* 600 * Convert a struct timespec into a 64-bit change attribute 601 * 602 * This does approximately the same thing as timespec_to_ns(), 603 * but for calculation efficiency, we multiply the seconds by 604 * 1024*1024*1024. 605 */ 606 static inline 607 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 608 { 609 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 610 } 611 612 #ifdef CONFIG_CRC32 613 /** 614 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 615 * @fh - pointer to filehandle 616 * 617 * returns a crc32 hash for the filehandle that is compatible with 618 * the one displayed by "wireshark". 619 */ 620 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 621 { 622 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 623 } 624 #else 625 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 626 { 627 return 0; 628 } 629 #endif 630